Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6: (143 commits)
  USB: xhci depends on PCI.
  USB: xhci: Add Makefile, MAINTAINERS, and Kconfig entries.
  USB: xhci: Respect critical sections.
  USB: xHCI: Fix interrupt moderation.
  USB: xhci: Remove packed attribute from structures.
  usb; xhci: Fix TRB offset calculations.
  USB: xhci: replace if-elseif-else with switch-case
  USB: xhci: Make xhci-mem.c include linux/dmapool.h
  USB: xhci: drop spinlock in xhci_urb_enqueue() error path.
  USB: Change names of SuperSpeed ep companion descriptor structs.
  USB: xhci: Avoid compiler reordering in Link TRB giveback.
  USB: xhci: Clean up xhci_irq() function.
  USB: xhci: Avoid global namespace pollution.
  USB: xhci: Fix Link TRB handoff bit twiddling.
  USB: xhci: Fix register write order.
  USB: xhci: fix some compiler warnings in xhci.h
  USB: xhci: fix lots of compiler warnings.
  USB: xhci: use xhci_handle_event instead of handle_event
  USB: xhci: URB cancellation support.
  USB: xhci: Scatter gather list support for bulk transfers.
  ...

24 files changed, 8617 insertions, 123 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 080bb1e4b847..5d1ddf485d1e 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -156,7 +156,7 @@ config USB_ATMEL_USBA
 
 config USB_GADGET_FSL_USB2
 	boolean "Freescale Highspeed USB DR Peripheral Controller"
-	depends on FSL_SOC
+	depends on FSL_SOC || ARCH_MXC
 	select USB_GADGET_DUALSPEED
 	help
 	   Some of Freescale PowerPC processors have a High Speed
@@ -253,7 +253,7 @@ config USB_PXA25X_SMALL
 
 config USB_GADGET_PXA27X
 	boolean "PXA 27x"
-	depends on ARCH_PXA && PXA27x
+	depends on ARCH_PXA && (PXA27x || PXA3xx)
 	select USB_OTG_UTILS
 	help
 	   Intel's PXA 27x series XScale ARM v5TE processors include
@@ -272,6 +272,20 @@ config USB_PXA27X
 	default USB_GADGET
 	select USB_GADGET_SELECTED
 
+config USB_GADGET_S3C_HSOTG
+	boolean "S3C HS/OtG USB Device controller"
+	depends on S3C_DEV_USB_HSOTG
+	select USB_GADGET_S3C_HSOTG_PIO
+	help
+	  The Samsung S3C64XX USB2.0 high-speed gadget controller
+	  integrated into the S3C64XX series SoC.
+
+config USB_S3C_HSOTG
+	tristate
+	depends on USB_GADGET_S3C_HSOTG
+	default USB_GADGET
+	select USB_GADGET_SELECTED
+
 config USB_GADGET_S3C2410
 	boolean "S3C2410 USB Device Controller"
 	depends on ARCH_S3C2410
@@ -460,6 +474,27 @@ config USB_GOKU
 	default USB_GADGET
 	select USB_GADGET_SELECTED
 
+config USB_GADGET_LANGWELL
+	boolean "Intel Langwell USB Device Controller"
+	depends on PCI
+	select USB_GADGET_DUALSPEED
+	help
+	   Intel Langwell USB Device Controller is a High-Speed USB
+	   On-The-Go device controller.
+
+	   The number of programmable endpoints is different through
+	   controller revision.
+
+	   Say "y" to link the driver statically, or "m" to build a
+	   dynamically linked module called "langwell_udc" and force all
+	   gadget drivers to also be dynamically linked.
+
+config USB_LANGWELL
+	tristate
+	depends on USB_GADGET_LANGWELL
+	default USB_GADGET
+	select USB_GADGET_SELECTED
+
 
 #
 # LAST -- dummy/emulated controller
@@ -566,6 +601,20 @@ config USB_ZERO_HNPTEST
 	  the "B-Peripheral" role, that device will use HNP to let this
 	  one serve as the USB host instead (in the "B-Host" role).
 
+config USB_AUDIO
+	tristate "Audio Gadget (EXPERIMENTAL)"
+	depends on SND
+	help
+	  Gadget Audio is compatible with USB Audio Class specification 1.0.
+	  It will include at least one AudioControl interface, zero or more
+	  AudioStream interface and zero or more MIDIStream interface.
+
+	  Gadget Audio will use on-board ALSA (CONFIG_SND) audio card to
+	  playback or capture audio stream.
+
+	  Say "y" to link the driver statically, or "m" to build a
+	  dynamically linked module called "g_audio".
+
 config USB_ETH
 	tristate "Ethernet Gadget (with CDC Ethernet support)"
 	depends on NET
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 39a51d746cb7..e6017e6bf6da 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -18,14 +18,21 @@ obj-$(CONFIG_USB_S3C2410)	+= s3c2410_udc.o
 obj-$(CONFIG_USB_AT91)		+= at91_udc.o
 obj-$(CONFIG_USB_ATMEL_USBA)	+= atmel_usba_udc.o
 obj-$(CONFIG_USB_FSL_USB2)	+= fsl_usb2_udc.o
+fsl_usb2_udc-objs		:= fsl_udc_core.o
+ifeq ($(CONFIG_ARCH_MXC),y)
+fsl_usb2_udc-objs		+= fsl_mx3_udc.o
+endif
 obj-$(CONFIG_USB_M66592)	+= m66592-udc.o
 obj-$(CONFIG_USB_FSL_QE)	+= fsl_qe_udc.o
 obj-$(CONFIG_USB_CI13XXX)	+= ci13xxx_udc.o
+obj-$(CONFIG_USB_S3C_HSOTG)	+= s3c-hsotg.o
+obj-$(CONFIG_USB_LANGWELL)	+= langwell_udc.o
 
 #
 # USB gadget drivers
 #
 g_zero-objs			:= zero.o
+g_audio-objs			:= audio.o
 g_ether-objs			:= ether.o
 g_serial-objs			:= serial.o
 g_midi-objs			:= gmidi.o
@@ -35,6 +42,7 @@ g_printer-objs			:= printer.o
 g_cdc-objs			:= cdc2.o
 
 obj-$(CONFIG_USB_ZERO)		+= g_zero.o
+obj-$(CONFIG_USB_AUDIO)		+= g_audio.o
 obj-$(CONFIG_USB_ETH)		+= g_ether.o
 obj-$(CONFIG_USB_GADGETFS)	+= gadgetfs.o
 obj-$(CONFIG_USB_FILE_STORAGE)	+= g_file_storage.o
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 53bcdd2f8282..72bae8f39d81 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -485,7 +485,7 @@ static int at91_ep_enable(struct usb_ep *_ep,
 		return -ESHUTDOWN;
 	}
 
-	tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+	tmp = usb_endpoint_type(desc);
 	switch (tmp) {
 	case USB_ENDPOINT_XFER_CONTROL:
 		DBG("only one control endpoint\n");
@@ -517,7 +517,7 @@ ok:
 	local_irq_save(flags);
 
 	/* initialize endpoint to match this descriptor */
-	ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
+	ep->is_in = usb_endpoint_dir_in(desc);
 	ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
 	ep->stopped = 0;
 	if (ep->is_in)
diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index 05c913cc3658..4e970cf0e29a 100644
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -326,13 +326,7 @@ static int vbus_is_present(struct usba_udc *udc)
 	return 1;
 }
 
-#if defined(CONFIG_AVR32)
-
-static void toggle_bias(int is_on)
-{
-}
-
-#elif defined(CONFIG_ARCH_AT91)
+#if defined(CONFIG_ARCH_AT91SAM9RL)
 
 #include <mach/at91_pmc.h>
 
@@ -346,7 +340,13 @@ static void toggle_bias(int is_on)
 		at91_sys_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
 }
 
-#endif /* CONFIG_ARCH_AT91 */
+#else
+
+static void toggle_bias(int is_on)
+{
+}
+
+#endif /* CONFIG_ARCH_AT91SAM9RL */
 
 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 {
@@ -550,12 +550,12 @@ usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 	DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 			ep->ep.name, ept_cfg, maxpacket);
 
-	if ((desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
+	if (usb_endpoint_dir_in(desc)) {
 		ep->is_in = 1;
 		ept_cfg |= USBA_EPT_DIR_IN;
 	}
 
-	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	switch (usb_endpoint_type(desc)) {
 	case USB_ENDPOINT_XFER_CONTROL:
 		ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 		ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
diff --git a/drivers/usb/gadget/audio.c b/drivers/usb/gadget/audio.c
new file mode 100644
index 000000000000..94de7e864614
--- /dev/null
+++ b/drivers/usb/gadget/audio.c
@@ -0,0 +1,302 @@
+/*
+ * audio.c -- Audio gadget driver
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+/* #define VERBOSE_DEBUG */
+
+#include <linux/kernel.h>
+#include <linux/utsname.h>
+
+#include "u_audio.h"
+
+#define DRIVER_DESC		"Linux USB Audio Gadget"
+#define DRIVER_VERSION		"Dec 18, 2008"
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Kbuild is not very cooperative with respect to linking separately
+ * compiled library objects into one module.  So for now we won't use
+ * separate compilation ... ensuring init/exit sections work to shrink
+ * the runtime footprint, and giving us at least some parts of what
+ * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
+ */
+#include "composite.c"
+#include "usbstring.c"
+#include "config.c"
+#include "epautoconf.c"
+
+#include "u_audio.c"
+#include "f_audio.c"
+
+/*-------------------------------------------------------------------------*/
+
+/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
+ * Instead:  allocate your own, using normal USB-IF procedures.
+ */
+
+/* Thanks to NetChip Technologies for donating this product ID. */
+#define AUDIO_VENDOR_NUM		0x0525	/* NetChip */
+#define AUDIO_PRODUCT_NUM		0xa4a1	/* Linux-USB Audio Gadget */
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_device_descriptor device_desc = {
+	.bLength =		sizeof device_desc,
+	.bDescriptorType =	USB_DT_DEVICE,
+
+	.bcdUSB =		__constant_cpu_to_le16(0x200),
+
+	.bDeviceClass =		USB_CLASS_PER_INTERFACE,
+	.bDeviceSubClass =	0,
+	.bDeviceProtocol =	0,
+	/* .bMaxPacketSize0 = f(hardware) */
+
+	/* Vendor and product id defaults change according to what configs
+	 * we support.  (As does bNumConfigurations.)  These values can
+	 * also be overridden by module parameters.
+	 */
+	.idVendor =		__constant_cpu_to_le16(AUDIO_VENDOR_NUM),
+	.idProduct =		__constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
+	/* .bcdDevice = f(hardware) */
+	/* .iManufacturer = DYNAMIC */
+	/* .iProduct = DYNAMIC */
+	/* NO SERIAL NUMBER */
+	.bNumConfigurations =	1,
+};
+
+static struct usb_otg_descriptor otg_descriptor = {
+	.bLength =		sizeof otg_descriptor,
+	.bDescriptorType =	USB_DT_OTG,
+
+	/* REVISIT SRP-only hardware is possible, although
+	 * it would not be called "OTG" ...
+	 */
+	.bmAttributes =		USB_OTG_SRP | USB_OTG_HNP,
+};
+
+static const struct usb_descriptor_header *otg_desc[] = {
+	(struct usb_descriptor_header *) &otg_descriptor,
+	NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * Handle USB audio endpoint set/get command in setup class request
+ */
+
+static int audio_set_endpoint_req(struct usb_configuration *c,
+		const struct usb_ctrlrequest *ctrl)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	int			value = -EOPNOTSUPP;
+	u16			ep = le16_to_cpu(ctrl->wIndex);
+	u16			len = le16_to_cpu(ctrl->wLength);
+	u16			w_value = le16_to_cpu(ctrl->wValue);
+
+	DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+			ctrl->bRequest, w_value, len, ep);
+
+	switch (ctrl->bRequest) {
+	case SET_CUR:
+		value = 0;
+		break;
+
+	case SET_MIN:
+		break;
+
+	case SET_MAX:
+		break;
+
+	case SET_RES:
+		break;
+
+	case SET_MEM:
+		break;
+
+	default:
+		break;
+	}
+
+	return value;
+}
+
+static int audio_get_endpoint_req(struct usb_configuration *c,
+		const struct usb_ctrlrequest *ctrl)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	int value = -EOPNOTSUPP;
+	u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+	u16 len = le16_to_cpu(ctrl->wLength);
+	u16 w_value = le16_to_cpu(ctrl->wValue);
+
+	DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+			ctrl->bRequest, w_value, len, ep);
+
+	switch (ctrl->bRequest) {
+	case GET_CUR:
+	case GET_MIN:
+	case GET_MAX:
+	case GET_RES:
+		value = 3;
+		break;
+	case GET_MEM:
+		break;
+	default:
+		break;
+	}
+
+	return value;
+}
+
+static int
+audio_setup(struct usb_configuration *c, const struct usb_ctrlrequest *ctrl)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	struct usb_request *req = cdev->req;
+	int value = -EOPNOTSUPP;
+	u16 w_index = le16_to_cpu(ctrl->wIndex);
+	u16 w_value = le16_to_cpu(ctrl->wValue);
+	u16 w_length = le16_to_cpu(ctrl->wLength);
+
+	/* composite driver infrastructure handles everything except
+	 * Audio class messages; interface activation uses set_alt().
+	 */
+	switch (ctrl->bRequestType) {
+	case USB_AUDIO_SET_ENDPOINT:
+		value = audio_set_endpoint_req(c, ctrl);
+		break;
+
+	case USB_AUDIO_GET_ENDPOINT:
+		value = audio_get_endpoint_req(c, ctrl);
+		break;
+
+	default:
+		ERROR(cdev, "Invalid control req%02x.%02x v%04x i%04x l%d\n",
+			ctrl->bRequestType, ctrl->bRequest,
+			w_value, w_index, w_length);
+	}
+
+	/* respond with data transfer or status phase? */
+	if (value >= 0) {
+		DBG(cdev, "Audio req%02x.%02x v%04x i%04x l%d\n",
+			ctrl->bRequestType, ctrl->bRequest,
+			w_value, w_index, w_length);
+		req->zero = 0;
+		req->length = value;
+		value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+		if (value < 0)
+			ERROR(cdev, "Audio response on err %d\n", value);
+	}
+
+	/* device either stalls (value < 0) or reports success */
+	return value;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int __init audio_do_config(struct usb_configuration *c)
+{
+	/* FIXME alloc iConfiguration string, set it in c->strings */
+
+	if (gadget_is_otg(c->cdev->gadget)) {
+		c->descriptors = otg_desc;
+		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+	}
+
+	audio_bind_config(c);
+
+	return 0;
+}
+
+static struct usb_configuration audio_config_driver = {
+	.label			= DRIVER_DESC,
+	.bind			= audio_do_config,
+	.setup			= audio_setup,
+	.bConfigurationValue	= 1,
+	/* .iConfiguration = DYNAMIC */
+	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __init audio_bind(struct usb_composite_dev *cdev)
+{
+	int			gcnum;
+	int			status;
+
+	gcnum = usb_gadget_controller_number(cdev->gadget);
+	if (gcnum >= 0)
+		device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
+	else {
+		ERROR(cdev, "controller '%s' not recognized; trying %s\n",
+			cdev->gadget->name,
+			audio_config_driver.label);
+		device_desc.bcdDevice =
+			__constant_cpu_to_le16(0x0300 | 0x0099);
+	}
+
+	/* device descriptor strings: manufacturer, product */
+	snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
+		init_utsname()->sysname, init_utsname()->release,
+		cdev->gadget->name);
+	status = usb_string_id(cdev);
+	if (status < 0)
+		goto fail;
+	strings_dev[STRING_MANUFACTURER_IDX].id = status;
+	device_desc.iManufacturer = status;
+
+	status = usb_string_id(cdev);
+	if (status < 0)
+		goto fail;
+	strings_dev[STRING_PRODUCT_IDX].id = status;
+	device_desc.iProduct = status;
+
+	status = usb_add_config(cdev, &audio_config_driver);
+	if (status < 0)
+		goto fail;
+
+	INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
+	return 0;
+
+fail:
+	return status;
+}
+
+static int __exit audio_unbind(struct usb_composite_dev *cdev)
+{
+	return 0;
+}
+
+static struct usb_composite_driver audio_driver = {
+	.name		= "g_audio",
+	.dev		= &device_desc,
+	.strings	= audio_strings,
+	.bind		= audio_bind,
+	.unbind		= __exit_p(audio_unbind),
+};
+
+static int __init init(void)
+{
+	return usb_composite_register(&audio_driver);
+}
+module_init(init);
+
+static void __exit cleanup(void)
+{
+	usb_composite_unregister(&audio_driver);
+}
+module_exit(cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/usb/gadget/ci13xxx_udc.c b/drivers/usb/gadget/ci13xxx_udc.c
index 38e531ecae4d..c7cb87a6fee2 100644
--- a/drivers/usb/gadget/ci13xxx_udc.c
+++ b/drivers/usb/gadget/ci13xxx_udc.c
@@ -1977,9 +1977,9 @@ static int ep_enable(struct usb_ep *ep,
 	if (!list_empty(&mEp->qh[mEp->dir].queue))
 		warn("enabling a non-empty endpoint!");
 
-	mEp->dir  = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? TX : RX;
-	mEp->num  =  desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
-	mEp->type =  desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+	mEp->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
+	mEp->num  = usb_endpoint_num(desc);
+	mEp->type = usb_endpoint_type(desc);
 
 	mEp->ep.maxpacket = __constant_le16_to_cpu(desc->wMaxPacketSize);
 
diff --git a/drivers/usb/gadget/f_audio.c b/drivers/usb/gadget/f_audio.c
new file mode 100644
index 000000000000..66527ba2d2ea
--- /dev/null
+++ b/drivers/usb/gadget/f_audio.c
@@ -0,0 +1,707 @@
+/*
+ * f_audio.c -- USB Audio class function driver
+  *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <asm/atomic.h>
+
+#include "u_audio.h"
+
+#define OUT_EP_MAX_PACKET_SIZE	200
+static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
+module_param(req_buf_size, int, S_IRUGO);
+MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
+
+static int req_count = 256;
+module_param(req_count, int, S_IRUGO);
+MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
+
+static int audio_buf_size = 48000;
+module_param(audio_buf_size, int, S_IRUGO);
+MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
+
+/*
+ * DESCRIPTORS ... most are static, but strings and full
+ * configuration descriptors are built on demand.
+ */
+
+/*
+ * We have two interfaces- AudioControl and AudioStreaming
+ * TODO: only supcard playback currently
+ */
+#define F_AUDIO_AC_INTERFACE	0
+#define F_AUDIO_AS_INTERFACE	1
+#define F_AUDIO_NUM_INTERFACES	2
+
+/* B.3.1  Standard AC Interface Descriptor */
+static struct usb_interface_descriptor ac_interface_desc __initdata = {
+	.bLength =		USB_DT_INTERFACE_SIZE,
+	.bDescriptorType =	USB_DT_INTERFACE,
+	.bNumEndpoints =	0,
+	.bInterfaceClass =	USB_CLASS_AUDIO,
+	.bInterfaceSubClass =	USB_SUBCLASS_AUDIOCONTROL,
+};
+
+DECLARE_USB_AC_HEADER_DESCRIPTOR(2);
+
+#define USB_DT_AC_HEADER_LENGH	USB_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
+/* B.3.2  Class-Specific AC Interface Descriptor */
+static struct usb_ac_header_descriptor_2 ac_header_desc = {
+	.bLength =		USB_DT_AC_HEADER_LENGH,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubtype =	HEADER,
+	.bcdADC =		__constant_cpu_to_le16(0x0100),
+	.wTotalLength =		__constant_cpu_to_le16(USB_DT_AC_HEADER_LENGH),
+	.bInCollection =	F_AUDIO_NUM_INTERFACES,
+	.baInterfaceNr = {
+		[0] =		F_AUDIO_AC_INTERFACE,
+		[1] =		F_AUDIO_AS_INTERFACE,
+	}
+};
+
+#define INPUT_TERMINAL_ID	1
+static struct usb_input_terminal_descriptor input_terminal_desc = {
+	.bLength =		USB_DT_AC_INPUT_TERMINAL_SIZE,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubtype =	INPUT_TERMINAL,
+	.bTerminalID =		INPUT_TERMINAL_ID,
+	.wTerminalType =	USB_AC_TERMINAL_STREAMING,
+	.bAssocTerminal =	0,
+	.wChannelConfig =	0x3,
+};
+
+DECLARE_USB_AC_FEATURE_UNIT_DESCRIPTOR(0);
+
+#define FEATURE_UNIT_ID		2
+static struct usb_ac_feature_unit_descriptor_0 feature_unit_desc = {
+	.bLength		= USB_DT_AC_FEATURE_UNIT_SIZE(0),
+	.bDescriptorType	= USB_DT_CS_INTERFACE,
+	.bDescriptorSubtype	= FEATURE_UNIT,
+	.bUnitID		= FEATURE_UNIT_ID,
+	.bSourceID		= INPUT_TERMINAL_ID,
+	.bControlSize		= 2,
+	.bmaControls[0]		= (FU_MUTE | FU_VOLUME),
+};
+
+static struct usb_audio_control mute_control = {
+	.list = LIST_HEAD_INIT(mute_control.list),
+	.name = "Mute Control",
+	.type = MUTE_CONTROL,
+	/* Todo: add real Mute control code */
+	.set = generic_set_cmd,
+	.get = generic_get_cmd,
+};
+
+static struct usb_audio_control volume_control = {
+	.list = LIST_HEAD_INIT(volume_control.list),
+	.name = "Volume Control",
+	.type = VOLUME_CONTROL,
+	/* Todo: add real Volume control code */
+	.set = generic_set_cmd,
+	.get = generic_get_cmd,
+};
+
+static struct usb_audio_control_selector feature_unit = {
+	.list = LIST_HEAD_INIT(feature_unit.list),
+	.id = FEATURE_UNIT_ID,
+	.name = "Mute & Volume Control",
+	.type = FEATURE_UNIT,
+	.desc = (struct usb_descriptor_header *)&feature_unit_desc,
+};
+
+#define OUTPUT_TERMINAL_ID	3
+static struct usb_output_terminal_descriptor output_terminal_desc = {
+	.bLength		= USB_DT_AC_OUTPUT_TERMINAL_SIZE,
+	.bDescriptorType	= USB_DT_CS_INTERFACE,
+	.bDescriptorSubtype	= OUTPUT_TERMINAL,
+	.bTerminalID		= OUTPUT_TERMINAL_ID,
+	.wTerminalType		= USB_AC_OUTPUT_TERMINAL_SPEAKER,
+	.bAssocTerminal		= FEATURE_UNIT_ID,
+	.bSourceID		= FEATURE_UNIT_ID,
+};
+
+/* B.4.1  Standard AS Interface Descriptor */
+static struct usb_interface_descriptor as_interface_alt_0_desc = {
+	.bLength =		USB_DT_INTERFACE_SIZE,
+	.bDescriptorType =	USB_DT_INTERFACE,
+	.bAlternateSetting =	0,
+	.bNumEndpoints =	0,
+	.bInterfaceClass =	USB_CLASS_AUDIO,
+	.bInterfaceSubClass =	USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+static struct usb_interface_descriptor as_interface_alt_1_desc = {
+	.bLength =		USB_DT_INTERFACE_SIZE,
+	.bDescriptorType =	USB_DT_INTERFACE,
+	.bAlternateSetting =	1,
+	.bNumEndpoints =	1,
+	.bInterfaceClass =	USB_CLASS_AUDIO,
+	.bInterfaceSubClass =	USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+/* B.4.2  Class-Specific AS Interface Descriptor */
+static struct usb_as_header_descriptor as_header_desc = {
+	.bLength =		USB_DT_AS_HEADER_SIZE,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubtype =	AS_GENERAL,
+	.bTerminalLink =	INPUT_TERMINAL_ID,
+	.bDelay =		1,
+	.wFormatTag =		USB_AS_AUDIO_FORMAT_TYPE_I_PCM,
+};
+
+DECLARE_USB_AS_FORMAT_TYPE_I_DISCRETE_DESC(1);
+
+static struct usb_as_formate_type_i_discrete_descriptor_1 as_type_i_desc = {
+	.bLength =		USB_AS_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubtype =	FORMAT_TYPE,
+	.bFormatType =		USB_AS_FORMAT_TYPE_I,
+	.bSubframeSize =	2,
+	.bBitResolution =	16,
+	.bSamFreqType =		1,
+};
+
+/* Standard ISO OUT Endpoint Descriptor */
+static struct usb_endpoint_descriptor as_out_ep_desc __initdata = {
+	.bLength =		USB_DT_ENDPOINT_AUDIO_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+	.bEndpointAddress =	USB_DIR_OUT,
+	.bmAttributes =		USB_AS_ENDPOINT_ADAPTIVE
+				| USB_ENDPOINT_XFER_ISOC,
+	.wMaxPacketSize =	__constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
+	.bInterval =		4,
+};
+
+/* Class-specific AS ISO OUT Endpoint Descriptor */
+static struct usb_as_iso_endpoint_descriptor as_iso_out_desc __initdata = {
+	.bLength =		USB_AS_ISO_ENDPOINT_DESC_SIZE,
+	.bDescriptorType =	USB_DT_CS_ENDPOINT,
+	.bDescriptorSubtype =	EP_GENERAL,
+	.bmAttributes = 	1,
+	.bLockDelayUnits =	1,
+	.wLockDelay =		__constant_cpu_to_le16(1),
+};
+
+static struct usb_descriptor_header *f_audio_desc[] __initdata = {
+	(struct usb_descriptor_header *)&ac_interface_desc,
+	(struct usb_descriptor_header *)&ac_header_desc,
+
+	(struct usb_descriptor_header *)&input_terminal_desc,
+	(struct usb_descriptor_header *)&output_terminal_desc,
+	(struct usb_descriptor_header *)&feature_unit_desc,
+
+	(struct usb_descriptor_header *)&as_interface_alt_0_desc,
+	(struct usb_descriptor_header *)&as_interface_alt_1_desc,
+	(struct usb_descriptor_header *)&as_header_desc,
+
+	(struct usb_descriptor_header *)&as_type_i_desc,
+
+	(struct usb_descriptor_header *)&as_out_ep_desc,
+	(struct usb_descriptor_header *)&as_iso_out_desc,
+	NULL,
+};
+
+/* string IDs are assigned dynamically */
+
+#define STRING_MANUFACTURER_IDX		0
+#define STRING_PRODUCT_IDX		1
+
+static char manufacturer[50];
+
+static struct usb_string strings_dev[] = {
+	[STRING_MANUFACTURER_IDX].s = manufacturer,
+	[STRING_PRODUCT_IDX].s = DRIVER_DESC,
+	{  } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_dev = {
+	.language	= 0x0409,	/* en-us */
+	.strings	= strings_dev,
+};
+
+static struct usb_gadget_strings *audio_strings[] = {
+	&stringtab_dev,
+	NULL,
+};
+
+/*
+ * This function is an ALSA sound card following USB Audio Class Spec 1.0.
+ */
+
+/*-------------------------------------------------------------------------*/
+struct f_audio_buf {
+	u8 *buf;
+	int actual;
+	struct list_head list;
+};
+
+static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
+{
+	struct f_audio_buf *copy_buf;
+
+	copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
+	if (!copy_buf)
+		return (struct f_audio_buf *)-ENOMEM;
+
+	copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
+	if (!copy_buf->buf) {
+		kfree(copy_buf);
+		return (struct f_audio_buf *)-ENOMEM;
+	}
+
+	return copy_buf;
+}
+
+static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
+{
+	kfree(audio_buf->buf);
+	kfree(audio_buf);
+}
+/*-------------------------------------------------------------------------*/
+
+struct f_audio {
+	struct gaudio			card;
+
+	/* endpoints handle full and/or high speeds */
+	struct usb_ep			*out_ep;
+	struct usb_endpoint_descriptor	*out_desc;
+
+	spinlock_t			lock;
+	struct f_audio_buf *copy_buf;
+	struct work_struct playback_work;
+	struct list_head play_queue;
+
+	/* Control Set command */
+	struct list_head cs;
+	u8 set_cmd;
+	struct usb_audio_control *set_con;
+};
+
+static inline struct f_audio *func_to_audio(struct usb_function *f)
+{
+	return container_of(f, struct f_audio, card.func);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void f_audio_playback_work(struct work_struct *data)
+{
+	struct f_audio *audio = container_of(data, struct f_audio,
+					playback_work);
+	struct f_audio_buf *play_buf;
+
+	spin_lock_irq(&audio->lock);
+	if (list_empty(&audio->play_queue)) {
+		spin_unlock_irq(&audio->lock);
+		return;
+	}
+	play_buf = list_first_entry(&audio->play_queue,
+			struct f_audio_buf, list);
+	list_del(&play_buf->list);
+	spin_unlock_irq(&audio->lock);
+
+	u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
+	f_audio_buffer_free(play_buf);
+
+	return;
+}
+
+static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct f_audio *audio = req->context;
+	struct usb_composite_dev *cdev = audio->card.func.config->cdev;
+	struct f_audio_buf *copy_buf = audio->copy_buf;
+	int err;
+
+	if (!copy_buf)
+		return -EINVAL;
+
+	/* Copy buffer is full, add it to the play_queue */
+	if (audio_buf_size - copy_buf->actual < req->actual) {
+		list_add_tail(&copy_buf->list, &audio->play_queue);
+		schedule_work(&audio->playback_work);
+		copy_buf = f_audio_buffer_alloc(audio_buf_size);
+		if (copy_buf < 0)
+			return -ENOMEM;
+	}
+
+	memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
+	copy_buf->actual += req->actual;
+	audio->copy_buf = copy_buf;
+
+	err = usb_ep_queue(ep, req, GFP_ATOMIC);
+	if (err)
+		ERROR(cdev, "%s queue req: %d\n", ep->name, err);
+
+	return 0;
+
+}
+
+static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct f_audio *audio = req->context;
+	int status = req->status;
+	u32 data = 0;
+	struct usb_ep *out_ep = audio->out_ep;
+
+	switch (status) {
+
+	case 0:				/* normal completion? */
+		if (ep == out_ep)
+			f_audio_out_ep_complete(ep, req);
+		else if (audio->set_con) {
+			memcpy(&data, req->buf, req->length);
+			audio->set_con->set(audio->set_con, audio->set_cmd,
+					le16_to_cpu(data));
+			audio->set_con = NULL;
+		}
+		break;
+	default:
+		break;
+	}
+}
+
+static int audio_set_intf_req(struct usb_function *f,
+		const struct usb_ctrlrequest *ctrl)
+{
+	struct f_audio		*audio = func_to_audio(f);
+	struct usb_composite_dev *cdev = f->config->cdev;
+	struct usb_request	*req = cdev->req;
+	u8			id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+	u16			len = le16_to_cpu(ctrl->wLength);
+	u16			w_value = le16_to_cpu(ctrl->wValue);
+	u8			con_sel = (w_value >> 8) & 0xFF;
+	u8			cmd = (ctrl->bRequest & 0x0F);
+	struct usb_audio_control_selector *cs;
+	struct usb_audio_control *con;
+
+	DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
+			ctrl->bRequest, w_value, len, id);
+
+	list_for_each_entry(cs, &audio->cs, list) {
+		if (cs->id == id) {
+			list_for_each_entry(con, &cs->control, list) {
+				if (con->type == con_sel) {
+					audio->set_con = con;
+					break;
+				}
+			}
+			break;
+		}
+	}
+
+	audio->set_cmd = cmd;
+	req->context = audio;
+	req->complete = f_audio_complete;
+
+	return len;
+}
+
+static int audio_get_intf_req(struct usb_function *f,
+		const struct usb_ctrlrequest *ctrl)
+{
+	struct f_audio		*audio = func_to_audio(f);
+	struct usb_composite_dev *cdev = f->config->cdev;
+	struct usb_request	*req = cdev->req;
+	int			value = -EOPNOTSUPP;
+	u8			id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+	u16			len = le16_to_cpu(ctrl->wLength);
+	u16			w_value = le16_to_cpu(ctrl->wValue);
+	u8			con_sel = (w_value >> 8) & 0xFF;
+	u8			cmd = (ctrl->bRequest & 0x0F);
+	struct usb_audio_control_selector *cs;
+	struct usb_audio_control *con;
+
+	DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
+			ctrl->bRequest, w_value, len, id);
+
+	list_for_each_entry(cs, &audio->cs, list) {
+		if (cs->id == id) {
+			list_for_each_entry(con, &cs->control, list) {
+				if (con->type == con_sel && con->get) {
+					value = con->get(con, cmd);
+					break;
+				}
+			}
+			break;
+		}
+	}
+
+	req->context = audio;
+	req->complete = f_audio_complete;
+	memcpy(req->buf, &value, len);
+
+	return len;
+}
+
+static int
+f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
+{
+	struct usb_composite_dev *cdev = f->config->cdev;
+	struct usb_request	*req = cdev->req;
+	int			value = -EOPNOTSUPP;
+	u16			w_index = le16_to_cpu(ctrl->wIndex);
+	u16			w_value = le16_to_cpu(ctrl->wValue);
+	u16			w_length = le16_to_cpu(ctrl->wLength);
+
+	/* composite driver infrastructure handles everything except
+	 * Audio class messages; interface activation uses set_alt().
+	 */
+	switch (ctrl->bRequestType) {
+	case USB_AUDIO_SET_INTF:
+		value = audio_set_intf_req(f, ctrl);
+		break;
+
+	case USB_AUDIO_GET_INTF:
+		value = audio_get_intf_req(f, ctrl);
+		break;
+
+	default:
+		ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
+			ctrl->bRequestType, ctrl->bRequest,
+			w_value, w_index, w_length);
+	}
+
+	/* respond with data transfer or status phase? */
+	if (value >= 0) {
+		DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
+			ctrl->bRequestType, ctrl->bRequest,
+			w_value, w_index, w_length);
+		req->zero = 0;
+		req->length = value;
+		value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+		if (value < 0)
+			ERROR(cdev, "audio response on err %d\n", value);
+	}
+
+	/* device either stalls (value < 0) or reports success */
+	return value;
+}
+
+static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+	struct f_audio		*audio = func_to_audio(f);
+	struct usb_composite_dev *cdev = f->config->cdev;
+	struct usb_ep *out_ep = audio->out_ep;
+	struct usb_request *req;
+	int i = 0, err = 0;
+
+	DBG(cdev, "intf %d, alt %d\n", intf, alt);
+
+	if (intf == 1) {
+		if (alt == 1) {
+			usb_ep_enable(out_ep, audio->out_desc);
+			out_ep->driver_data = audio;
+			audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
+
+			/*
+			 * allocate a bunch of read buffers
+			 * and queue them all at once.
+			 */
+			for (i = 0; i < req_count && err == 0; i++) {
+				req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
+				if (req) {
+					req->buf = kzalloc(req_buf_size,
+							GFP_ATOMIC);
+					if (req->buf) {
+						req->length = req_buf_size;
+						req->context = audio;
+						req->complete =
+							f_audio_complete;
+						err = usb_ep_queue(out_ep,
+							req, GFP_ATOMIC);
+						if (err)
+							ERROR(cdev,
+							"%s queue req: %d\n",
+							out_ep->name, err);
+					} else
+						err = -ENOMEM;
+				} else
+					err = -ENOMEM;
+			}
+
+		} else {
+			struct f_audio_buf *copy_buf = audio->copy_buf;
+			if (copy_buf) {
+				list_add_tail(&copy_buf->list,
+						&audio->play_queue);
+				schedule_work(&audio->playback_work);
+			}
+		}
+	}
+
+	return err;
+}
+
+static void f_audio_disable(struct usb_function *f)
+{
+	return;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void f_audio_build_desc(struct f_audio *audio)
+{
+	struct gaudio *card = &audio->card;
+	u8 *sam_freq;
+	int rate;
+
+	/* Set channel numbers */
+	input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
+	as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
+
+	/* Set sample rates */
+	rate = u_audio_get_playback_rate(card);
+	sam_freq = as_type_i_desc.tSamFreq[0];
+	memcpy(sam_freq, &rate, 3);
+
+	/* Todo: Set Sample bits and other parameters */
+
+	return;
+}
+
+/* audio function driver setup/binding */
+static int __init
+f_audio_bind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	struct f_audio		*audio = func_to_audio(f);
+	int			status;
+	struct usb_ep		*ep;
+
+	f_audio_build_desc(audio);
+
+	/* allocate instance-specific interface IDs, and patch descriptors */
+	status = usb_interface_id(c, f);
+	if (status < 0)
+		goto fail;
+	ac_interface_desc.bInterfaceNumber = status;
+
+	status = usb_interface_id(c, f);
+	if (status < 0)
+		goto fail;
+	as_interface_alt_0_desc.bInterfaceNumber = status;
+	as_interface_alt_1_desc.bInterfaceNumber = status;
+
+	status = -ENODEV;
+
+	/* allocate instance-specific endpoints */
+	ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
+	if (!ep)
+		goto fail;
+	audio->out_ep = ep;
+	ep->driver_data = cdev;	/* claim */
+
+	status = -ENOMEM;
+
+	/* supcard all relevant hardware speeds... we expect that when
+	 * hardware is dual speed, all bulk-capable endpoints work at
+	 * both speeds
+	 */
+
+	/* copy descriptors, and track endpoint copies */
+	if (gadget_is_dualspeed(c->cdev->gadget)) {
+		c->highspeed = true;
+		f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
+	} else
+		f->descriptors = usb_copy_descriptors(f_audio_desc);
+
+	return 0;
+
+fail:
+
+	return status;
+}
+
+static void
+f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct f_audio		*audio = func_to_audio(f);
+
+	usb_free_descriptors(f->descriptors);
+	kfree(audio);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* Todo: add more control selecotor dynamically */
+int __init control_selector_init(struct f_audio *audio)
+{
+	INIT_LIST_HEAD(&audio->cs);
+	list_add(&feature_unit.list, &audio->cs);
+
+	INIT_LIST_HEAD(&feature_unit.control);
+	list_add(&mute_control.list, &feature_unit.control);
+	list_add(&volume_control.list, &feature_unit.control);
+
+	volume_control.data[_CUR] = 0xffc0;
+	volume_control.data[_MIN] = 0xe3a0;
+	volume_control.data[_MAX] = 0xfff0;
+	volume_control.data[_RES] = 0x0030;
+
+	return 0;
+}
+
+/**
+ * audio_bind_config - add USB audio fucntion to a configuration
+ * @c: the configuration to supcard the USB audio function
+ * Context: single threaded during gadget setup
+ *
+ * Returns zero on success, else negative errno.
+ */
+int __init audio_bind_config(struct usb_configuration *c)
+{
+	struct f_audio *audio;
+	int status;
+
+	/* allocate and initialize one new instance */
+	audio = kzalloc(sizeof *audio, GFP_KERNEL);
+	if (!audio)
+		return -ENOMEM;
+
+	audio->card.func.name = "g_audio";
+	audio->card.gadget = c->cdev->gadget;
+
+	INIT_LIST_HEAD(&audio->play_queue);
+	spin_lock_init(&audio->lock);
+
+	/* set up ASLA audio devices */
+	status = gaudio_setup(&audio->card);
+	if (status < 0)
+		goto setup_fail;
+
+	audio->card.func.strings = audio_strings;
+	audio->card.func.bind = f_audio_bind;
+	audio->card.func.unbind = f_audio_unbind;
+	audio->card.func.set_alt = f_audio_set_alt;
+	audio->card.func.setup = f_audio_setup;
+	audio->card.func.disable = f_audio_disable;
+	audio->out_desc = &as_out_ep_desc;
+
+	control_selector_init(audio);
+
+	INIT_WORK(&audio->playback_work, f_audio_playback_work);
+
+	status = usb_add_function(c, &audio->card.func);
+	if (status)
+		goto add_fail;
+
+	INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
+		audio_buf_size, req_buf_size, req_count);
+
+	return status;
+
+add_fail:
+	gaudio_cleanup(&audio->card);
+setup_fail:
+	kfree(audio);
+	return status;
+}
diff --git a/drivers/usb/gadget/f_rndis.c b/drivers/usb/gadget/f_rndis.c
index 3279a4726042..424a37c5773f 100644
--- a/drivers/usb/gadget/f_rndis.c
+++ b/drivers/usb/gadget/f_rndis.c
@@ -475,7 +475,9 @@ static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		if (rndis->port.in_ep->driver_data) {
 			DBG(cdev, "reset rndis\n");
 			gether_disconnect(&rndis->port);
-		} else {
+		}
+
+		if (!rndis->port.in) {
 			DBG(cdev, "init rndis\n");
 			rndis->port.in = ep_choose(cdev->gadget,
 					rndis->hs.in, rndis->fs.in);
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 381a53b3e11c..1e6aa504d58a 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -248,6 +248,8 @@
 #include <linux/freezer.h>
 #include <linux/utsname.h>
 
+#include <asm/unaligned.h>
+
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 
@@ -799,29 +801,9 @@ static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
 
 /* Routines for unaligned data access */
 
-static u16 get_be16(u8 *buf)
-{
-	return ((u16) buf[0] << 8) | ((u16) buf[1]);
-}
-
-static u32 get_be32(u8 *buf)
-{
-	return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
-			((u32) buf[2] << 8) | ((u32) buf[3]);
-}
-
-static void put_be16(u8 *buf, u16 val)
-{
-	buf[0] = val >> 8;
-	buf[1] = val;
-}
-
-static void put_be32(u8 *buf, u32 val)
+static u32 get_unaligned_be24(u8 *buf)
 {
-	buf[0] = val >> 24;
-	buf[1] = val >> 16;
-	buf[2] = val >> 8;
-	buf[3] = val & 0xff;
+	return 0xffffff & (u32) get_unaligned_be32(buf - 1);
 }
 
 
@@ -1582,9 +1564,9 @@ static int do_read(struct fsg_dev *fsg)
 	/* Get the starting Logical Block Address and check that it's
 	 * not too big */
 	if (fsg->cmnd[0] == SC_READ_6)
-		lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
+		lba = get_unaligned_be24(&fsg->cmnd[1]);
 	else {
-		lba = get_be32(&fsg->cmnd[2]);
+		lba = get_unaligned_be32(&fsg->cmnd[2]);
 
 		/* We allow DPO (Disable Page Out = don't save data in the
 		 * cache) and FUA (Force Unit Access = don't read from the
@@ -1717,9 +1699,9 @@ static int do_write(struct fsg_dev *fsg)
 	/* Get the starting Logical Block Address and check that it's
 	 * not too big */
 	if (fsg->cmnd[0] == SC_WRITE_6)
-		lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
+		lba = get_unaligned_be24(&fsg->cmnd[1]);
 	else {
-		lba = get_be32(&fsg->cmnd[2]);
+		lba = get_unaligned_be32(&fsg->cmnd[2]);
 
 		/* We allow DPO (Disable Page Out = don't save data in the
 		 * cache) and FUA (Force Unit Access = write directly to the
@@ -1940,7 +1922,7 @@ static int do_verify(struct fsg_dev *fsg)
 
 	/* Get the starting Logical Block Address and check that it's
 	 * not too big */
-	lba = get_be32(&fsg->cmnd[2]);
+	lba = get_unaligned_be32(&fsg->cmnd[2]);
 	if (lba >= curlun->num_sectors) {
 		curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
 		return -EINVAL;
@@ -1953,7 +1935,7 @@ static int do_verify(struct fsg_dev *fsg)
 		return -EINVAL;
 	}
 
-	verification_length = get_be16(&fsg->cmnd[7]);
+	verification_length = get_unaligned_be16(&fsg->cmnd[7]);
 	if (unlikely(verification_length == 0))
 		return -EIO;		// No default reply
 
@@ -2103,7 +2085,7 @@ static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 	memset(buf, 0, 18);
 	buf[0] = valid | 0x70;			// Valid, current error
 	buf[2] = SK(sd);
-	put_be32(&buf[3], sdinfo);		// Sense information
+	put_unaligned_be32(sdinfo, &buf[3]);	/* Sense information */
 	buf[7] = 18 - 8;			// Additional sense length
 	buf[12] = ASC(sd);
 	buf[13] = ASCQ(sd);
@@ -2114,7 +2096,7 @@ static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 {
 	struct lun	*curlun = fsg->curlun;
-	u32		lba = get_be32(&fsg->cmnd[2]);
+	u32		lba = get_unaligned_be32(&fsg->cmnd[2]);
 	int		pmi = fsg->cmnd[8];
 	u8		*buf = (u8 *) bh->buf;
 
@@ -2124,8 +2106,9 @@ static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 		return -EINVAL;
 	}
 
-	put_be32(&buf[0], curlun->num_sectors - 1);	// Max logical block
-	put_be32(&buf[4], 512);				// Block length
+	put_unaligned_be32(curlun->num_sectors - 1, &buf[0]);
+						/* Max logical block */
+	put_unaligned_be32(512, &buf[4]);	/* Block length */
 	return 8;
 }
 
@@ -2144,7 +2127,7 @@ static void store_cdrom_address(u8 *dest, int msf, u32 addr)
 		dest[0] = 0;		/* Reserved */
 	} else {
 		/* Absolute sector */
-		put_be32(dest, addr);
+		put_unaligned_be32(addr, dest);
 	}
 }
 
@@ -2152,7 +2135,7 @@ static int do_read_header(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 {
 	struct lun	*curlun = fsg->curlun;
 	int		msf = fsg->cmnd[1] & 0x02;
-	u32		lba = get_be32(&fsg->cmnd[2]);
+	u32		lba = get_unaligned_be32(&fsg->cmnd[2]);
 	u8		*buf = (u8 *) bh->buf;
 
 	if ((fsg->cmnd[1] & ~0x02) != 0) {		/* Mask away MSF */
@@ -2252,10 +2235,13 @@ static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 			buf[2] = 0x04;	// Write cache enable,
 					// Read cache not disabled
 					// No cache retention priorities
-			put_be16(&buf[4], 0xffff);  // Don't disable prefetch
-					// Minimum prefetch = 0
-			put_be16(&buf[8], 0xffff);  // Maximum prefetch
-			put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
+			put_unaligned_be16(0xffff, &buf[4]);
+					/* Don't disable prefetch */
+					/* Minimum prefetch = 0 */
+			put_unaligned_be16(0xffff, &buf[8]);
+					/* Maximum prefetch */
+			put_unaligned_be16(0xffff, &buf[10]);
+					/* Maximum prefetch ceiling */
 		}
 		buf += 12;
 	}
@@ -2272,7 +2258,7 @@ static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 	if (mscmnd == SC_MODE_SENSE_6)
 		buf0[0] = len - 1;
 	else
-		put_be16(buf0, len - 2);
+		put_unaligned_be16(len - 2, buf0);
 	return len;
 }
 
@@ -2360,9 +2346,10 @@ static int do_read_format_capacities(struct fsg_dev *fsg,
 	buf[3] = 8;		// Only the Current/Maximum Capacity Descriptor
 	buf += 4;
 
-	put_be32(&buf[0], curlun->num_sectors);		// Number of blocks
-	put_be32(&buf[4], 512);				// Block length
-	buf[4] = 0x02;					// Current capacity
+	put_unaligned_be32(curlun->num_sectors, &buf[0]);
+						/* Number of blocks */
+	put_unaligned_be32(512, &buf[4]);	/* Block length */
+	buf[4] = 0x02;				/* Current capacity */
 	return 12;
 }
 
@@ -2882,7 +2869,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
 		break;
 
 	case SC_MODE_SELECT_10:
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
 		if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
 				(1<<1) | (3<<7), 0,
 				"MODE SELECT(10)")) == 0)
@@ -2898,7 +2885,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
 		break;
 
 	case SC_MODE_SENSE_10:
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
 		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
 				(1<<1) | (1<<2) | (3<<7), 0,
 				"MODE SENSE(10)")) == 0)
@@ -2923,7 +2910,8 @@ static int do_scsi_command(struct fsg_dev *fsg)
 		break;
 
 	case SC_READ_10:
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
+		fsg->data_size_from_cmnd =
+				get_unaligned_be16(&fsg->cmnd[7]) << 9;
 		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
 				(1<<1) | (0xf<<2) | (3<<7), 1,
 				"READ(10)")) == 0)
@@ -2931,7 +2919,8 @@ static int do_scsi_command(struct fsg_dev *fsg)
 		break;
 
 	case SC_READ_12:
-		fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
+		fsg->data_size_from_cmnd =
+				get_unaligned_be32(&fsg->cmnd[6]) << 9;
 		if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
 				(1<<1) | (0xf<<2) | (0xf<<6), 1,
 				"READ(12)")) == 0)
@@ -2949,7 +2938,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
 	case SC_READ_HEADER:
 		if (!mod_data.cdrom)
 			goto unknown_cmnd;
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
 		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
 				(3<<7) | (0x1f<<1), 1,
 				"READ HEADER")) == 0)
@@ -2959,7 +2948,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
 	case SC_READ_TOC:
 		if (!mod_data.cdrom)
 			goto unknown_cmnd;
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
 		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
 				(7<<6) | (1<<1), 1,
 				"READ TOC")) == 0)
@@ -2967,7 +2956,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
 		break;
 
 	case SC_READ_FORMAT_CAPACITIES:
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+		fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
 		if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
 				(3<<7), 1,
 				"READ FORMAT CAPACITIES")) == 0)
@@ -3025,7 +3014,8 @@ static int do_scsi_command(struct fsg_dev *fsg)
 		break;
 
 	case SC_WRITE_10:
-		fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
+		fsg->data_size_from_cmnd =
+				get_unaligned_be16(&fsg->cmnd[7]) << 9;
 		if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
 				(1<<1) | (0xf<<2) | (3<<7), 1,
 				"WRITE(10)")) == 0)
@@ -3033,7 +3023,8 @@ static int do_scsi_command(struct fsg_dev *fsg)
 		break;
 
 	case SC_WRITE_12:
-		fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
+		fsg->data_size_from_cmnd =
+				get_unaligned_be32(&fsg->cmnd[6]) << 9;
 		if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
 				(1<<1) | (0xf<<2) | (0xf<<6), 1,
 				"WRITE(12)")) == 0)
diff --git a/drivers/usb/gadget/fsl_mx3_udc.c b/drivers/usb/gadget/fsl_mx3_udc.c
new file mode 100644
index 000000000000..4bc2bf3d602e
--- /dev/null
+++ b/drivers/usb/gadget/fsl_mx3_udc.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
+ *
+ * Description:
+ * Helper routines for i.MX3x SoCs from Freescale, needed by the fsl_usb2_udc.c
+ * driver to function correctly on these systems.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/fsl_devices.h>
+#include <linux/platform_device.h>
+
+static struct clk *mxc_ahb_clk;
+static struct clk *mxc_usb_clk;
+
+int fsl_udc_clk_init(struct platform_device *pdev)
+{
+	struct fsl_usb2_platform_data *pdata;
+	unsigned long freq;
+	int ret;
+
+	pdata = pdev->dev.platform_data;
+
+	mxc_ahb_clk = clk_get(&pdev->dev, "usb_ahb");
+	if (IS_ERR(mxc_ahb_clk))
+		return PTR_ERR(mxc_ahb_clk);
+
+	ret = clk_enable(mxc_ahb_clk);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "clk_enable(\"usb_ahb\") failed\n");
+		goto eenahb;
+	}
+
+	/* make sure USB_CLK is running at 60 MHz +/- 1000 Hz */
+	mxc_usb_clk = clk_get(&pdev->dev, "usb");
+	if (IS_ERR(mxc_usb_clk)) {
+		dev_err(&pdev->dev, "clk_get(\"usb\") failed\n");
+		ret = PTR_ERR(mxc_usb_clk);
+		goto egusb;
+	}
+
+	freq = clk_get_rate(mxc_usb_clk);
+	if (pdata->phy_mode != FSL_USB2_PHY_ULPI &&
+	    (freq < 59999000 || freq > 60001000)) {
+		dev_err(&pdev->dev, "USB_CLK=%lu, should be 60MHz\n", freq);
+		goto eclkrate;
+	}
+
+	ret = clk_enable(mxc_usb_clk);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "clk_enable(\"usb_clk\") failed\n");
+		goto eenusb;
+	}
+
+	return 0;
+
+eenusb:
+eclkrate:
+	clk_put(mxc_usb_clk);
+	mxc_usb_clk = NULL;
+egusb:
+	clk_disable(mxc_ahb_clk);
+eenahb:
+	clk_put(mxc_ahb_clk);
+	return ret;
+}
+
+void fsl_udc_clk_finalize(struct platform_device *pdev)
+{
+	struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
+
+	/* ULPI transceivers don't need usbpll */
+	if (pdata->phy_mode == FSL_USB2_PHY_ULPI) {
+		clk_disable(mxc_usb_clk);
+		clk_put(mxc_usb_clk);
+		mxc_usb_clk = NULL;
+	}
+}
+
+void fsl_udc_clk_release(void)
+{
+	if (mxc_usb_clk) {
+		clk_disable(mxc_usb_clk);
+		clk_put(mxc_usb_clk);
+	}
+	clk_disable(mxc_ahb_clk);
+	clk_put(mxc_ahb_clk);
+}
diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_udc_core.c
index 9d7b95d4e3d2..42a74b8a0bb8 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.c
+++ b/drivers/usb/gadget/fsl_udc_core.c
@@ -38,6 +38,7 @@
 #include <linux/platform_device.h>
 #include <linux/fsl_devices.h>
 #include <linux/dmapool.h>
+#include <linux/delay.h>
 
 #include <asm/byteorder.h>
 #include <asm/io.h>
@@ -57,7 +58,9 @@ static const char driver_name[] = "fsl-usb2-udc";
 static const char driver_desc[] = DRIVER_DESC;
 
 static struct usb_dr_device *dr_regs;
+#ifndef CONFIG_ARCH_MXC
 static struct usb_sys_interface *usb_sys_regs;
+#endif
 
 /* it is initialized in probe()  */
 static struct fsl_udc *udc_controller = NULL;
@@ -174,10 +177,34 @@ static void nuke(struct fsl_ep *ep, int status)
 
 static int dr_controller_setup(struct fsl_udc *udc)
 {
-	unsigned int tmp = 0, portctrl = 0, ctrl = 0;
+	unsigned int tmp, portctrl;
+#ifndef CONFIG_ARCH_MXC
+	unsigned int ctrl;
+#endif
 	unsigned long timeout;
 #define FSL_UDC_RESET_TIMEOUT 1000
 
+	/* Config PHY interface */
+	portctrl = fsl_readl(&dr_regs->portsc1);
+	portctrl &= ~(PORTSCX_PHY_TYPE_SEL | PORTSCX_PORT_WIDTH);
+	switch (udc->phy_mode) {
+	case FSL_USB2_PHY_ULPI:
+		portctrl |= PORTSCX_PTS_ULPI;
+		break;
+	case FSL_USB2_PHY_UTMI_WIDE:
+		portctrl |= PORTSCX_PTW_16BIT;
+		/* fall through */
+	case FSL_USB2_PHY_UTMI:
+		portctrl |= PORTSCX_PTS_UTMI;
+		break;
+	case FSL_USB2_PHY_SERIAL:
+		portctrl |= PORTSCX_PTS_FSLS;
+		break;
+	default:
+		return -EINVAL;
+	}
+	fsl_writel(portctrl, &dr_regs->portsc1);
+
 	/* Stop and reset the usb controller */
 	tmp = fsl_readl(&dr_regs->usbcmd);
 	tmp &= ~USB_CMD_RUN_STOP;
@@ -215,31 +242,12 @@ static int dr_controller_setup(struct fsl_udc *udc)
 		udc->ep_qh, (int)tmp,
 		fsl_readl(&dr_regs->endpointlistaddr));
 
-	/* Config PHY interface */
-	portctrl = fsl_readl(&dr_regs->portsc1);
-	portctrl &= ~(PORTSCX_PHY_TYPE_SEL | PORTSCX_PORT_WIDTH);
-	switch (udc->phy_mode) {
-	case FSL_USB2_PHY_ULPI:
-		portctrl |= PORTSCX_PTS_ULPI;
-		break;
-	case FSL_USB2_PHY_UTMI_WIDE:
-		portctrl |= PORTSCX_PTW_16BIT;
-		/* fall through */
-	case FSL_USB2_PHY_UTMI:
-		portctrl |= PORTSCX_PTS_UTMI;
-		break;
-	case FSL_USB2_PHY_SERIAL:
-		portctrl |= PORTSCX_PTS_FSLS;
-		break;
-	default:
-		return -EINVAL;
-	}
-	fsl_writel(portctrl, &dr_regs->portsc1);
-
 	/* Config control enable i/o output, cpu endian register */
+#ifndef CONFIG_ARCH_MXC
 	ctrl = __raw_readl(&usb_sys_regs->control);
 	ctrl |= USB_CTRL_IOENB;
 	__raw_writel(ctrl, &usb_sys_regs->control);
+#endif
 
 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
 	/* Turn on cache snooping hardware, since some PowerPC platforms
@@ -2043,6 +2051,7 @@ static int fsl_proc_read(char *page, char **start, off_t off, int count,
 	size -= t;
 	next += t;
 
+#ifndef CONFIG_ARCH_MXC
 	tmp_reg = usb_sys_regs->snoop1;
 	t = scnprintf(next, size, "Snoop1 Reg : = [0x%x]\n\n", tmp_reg);
 	size -= t;
@@ -2053,6 +2062,7 @@ static int fsl_proc_read(char *page, char **start, off_t off, int count,
 			tmp_reg);
 	size -= t;
 	next += t;
+#endif
 
 	/* ------fsl_udc, fsl_ep, fsl_request structure information ----- */
 	ep = &udc->eps[0];
@@ -2263,14 +2273,21 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
 		goto err_kfree;
 	}
 
-	dr_regs = ioremap(res->start, res->end - res->start + 1);
+	dr_regs = ioremap(res->start, resource_size(res));
 	if (!dr_regs) {
 		ret = -ENOMEM;
 		goto err_release_mem_region;
 	}
 
+#ifndef CONFIG_ARCH_MXC
 	usb_sys_regs = (struct usb_sys_interface *)
 			((u32)dr_regs + USB_DR_SYS_OFFSET);
+#endif
+
+	/* Initialize USB clocks */
+	ret = fsl_udc_clk_init(pdev);
+	if (ret < 0)
+		goto err_iounmap_noclk;
 
 	/* Read Device Controller Capability Parameters register */
 	dccparams = fsl_readl(&dr_regs->dccparams);
@@ -2308,6 +2325,8 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
 	 * leave usbintr reg untouched */
 	dr_controller_setup(udc_controller);
 
+	fsl_udc_clk_finalize(pdev);
+
 	/* Setup gadget structure */
 	udc_controller->gadget.ops = &fsl_gadget_ops;
 	udc_controller->gadget.is_dualspeed = 1;
@@ -2362,6 +2381,8 @@ err_unregister:
 err_free_irq:
 	free_irq(udc_controller->irq, udc_controller);
 err_iounmap:
+	fsl_udc_clk_release();
+err_iounmap_noclk:
 	iounmap(dr_regs);
 err_release_mem_region:
 	release_mem_region(res->start, res->end - res->start + 1);
@@ -2384,6 +2405,8 @@ static int __exit fsl_udc_remove(struct platform_device *pdev)
 		return -ENODEV;
 	udc_controller->done = &done;
 
+	fsl_udc_clk_release();
+
 	/* DR has been stopped in usb_gadget_unregister_driver() */
 	remove_proc_file();
 
diff --git a/drivers/usb/gadget/fsl_usb2_udc.h b/drivers/usb/gadget/fsl_usb2_udc.h
index e63ef12645f5..20aeceed48c7 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.h
+++ b/drivers/usb/gadget/fsl_usb2_udc.h
@@ -563,4 +563,22 @@ static void dump_msg(const char *label, const u8 * buf, unsigned int length)
 					* 2 + ((windex & USB_DIR_IN) ? 1 : 0))
 #define get_pipe_by_ep(EP)	(ep_index(EP) * 2 + ep_is_in(EP))
 
+struct platform_device;
+#ifdef CONFIG_ARCH_MXC
+int fsl_udc_clk_init(struct platform_device *pdev);
+void fsl_udc_clk_finalize(struct platform_device *pdev);
+void fsl_udc_clk_release(void);
+#else
+static inline int fsl_udc_clk_init(struct platform_device *pdev)
+{
+	return 0;
+}
+static inline void fsl_udc_clk_finalize(struct platform_device *pdev)
+{
+}
+static inline void fsl_udc_clk_release(void)
+{
+}
+#endif
+
 #endif
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index ec6d439a2aa5..8e0e9a0b7364 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -137,6 +137,12 @@
 #define gadget_is_musbhdrc(g)	0
 #endif
 
+#ifdef CONFIG_USB_GADGET_LANGWELL
+#define gadget_is_langwell(g)	(!strcmp("langwell_udc", (g)->name))
+#else
+#define gadget_is_langwell(g)	0
+#endif
+
 /* from Montavista kernel (?) */
 #ifdef CONFIG_USB_GADGET_MPC8272
 #define gadget_is_mpc8272(g)	!strcmp("mpc8272_udc", (g)->name)
@@ -231,6 +237,8 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
 		return 0x22;
 	else if (gadget_is_ci13xxx(gadget))
 		return 0x23;
+	else if (gadget_is_langwell(gadget))
+		return 0x24;
 	return -ENOENT;
 }
 
diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index de010c939dbb..112bb40a427c 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -110,10 +110,10 @@ goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 		return -EINVAL;
 	if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 		return -ESHUTDOWN;
-	if (ep->num != (desc->bEndpointAddress & 0x0f))
+	if (ep->num != usb_endpoint_num(desc))
 		return -EINVAL;
 
-	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	switch (usb_endpoint_type(desc)) {
 	case USB_ENDPOINT_XFER_BULK:
 	case USB_ENDPOINT_XFER_INT:
 		break;
@@ -142,7 +142,7 @@ goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 	/* ep1/ep2 dma direction is chosen early; it works in the other
 	 * direction, with pio.  be cautious with out-dma.
 	 */
-	ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
+	ep->is_in = usb_endpoint_dir_in(desc);
 	if (ep->is_in) {
 		mode |= 1;
 		ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
diff --git a/drivers/usb/gadget/imx_udc.c b/drivers/usb/gadget/imx_udc.c
index 168658b4b4e2..c52a681f376c 100644
--- a/drivers/usb/gadget/imx_udc.c
+++ b/drivers/usb/gadget/imx_udc.c
@@ -415,6 +415,13 @@ static int write_packet(struct imx_ep_struct *imx_ep, struct imx_request *req)
 	u8	*buf;
 	int	length, count, temp;
 
+	if (unlikely(__raw_readl(imx_ep->imx_usb->base +
+				 USB_EP_STAT(EP_NO(imx_ep))) & EPSTAT_ZLPS)) {
+		D_TRX(imx_ep->imx_usb->dev, "<%s> zlp still queued in EP %s\n",
+			__func__, imx_ep->ep.name);
+		return -1;
+	}
+
 	buf = req->req.buf + req->req.actual;
 	prefetch(buf);
 
@@ -734,9 +741,12 @@ static struct usb_request *imx_ep_alloc_request
 {
 	struct imx_request *req;
 
+	if (!usb_ep)
+		return NULL;
+
 	req = kzalloc(sizeof *req, gfp_flags);
-	if (!req || !usb_ep)
-		return 0;
+	if (!req)
+		return NULL;
 
 	INIT_LIST_HEAD(&req->queue);
 	req->in_use = 0;
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index d20937f28a19..7d33f50b5874 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -384,9 +384,8 @@ ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 		return value;
 
 	/* halt any endpoint by doing a "wrong direction" i/o call */
-	if (data->desc.bEndpointAddress & USB_DIR_IN) {
-		if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
-				== USB_ENDPOINT_XFER_ISOC)
+	if (usb_endpoint_dir_in(&data->desc)) {
+		if (usb_endpoint_xfer_isoc(&data->desc))
 			return -EINVAL;
 		DBG (data->dev, "%s halt\n", data->name);
 		spin_lock_irq (&data->dev->lock);
@@ -428,9 +427,8 @@ ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 		return value;
 
 	/* halt any endpoint by doing a "wrong direction" i/o call */
-	if (!(data->desc.bEndpointAddress & USB_DIR_IN)) {
-		if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
-				== USB_ENDPOINT_XFER_ISOC)
+	if (!usb_endpoint_dir_in(&data->desc)) {
+		if (usb_endpoint_xfer_isoc(&data->desc))
 			return -EINVAL;
 		DBG (data->dev, "%s halt\n", data->name);
 		spin_lock_irq (&data->dev->lock);
@@ -691,7 +689,7 @@ ep_aio_read(struct kiocb *iocb, const struct iovec *iov,
 	struct ep_data		*epdata = iocb->ki_filp->private_data;
 	char			*buf;
 
-	if (unlikely(epdata->desc.bEndpointAddress & USB_DIR_IN))
+	if (unlikely(usb_endpoint_dir_in(&epdata->desc)))
 		return -EINVAL;
 
 	buf = kmalloc(iocb->ki_left, GFP_KERNEL);
@@ -711,7 +709,7 @@ ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
 	size_t			len = 0;
 	int			i = 0;
 
-	if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN)))
+	if (unlikely(!usb_endpoint_dir_in(&epdata->desc)))
 		return -EINVAL;
 
 	buf = kmalloc(iocb->ki_left, GFP_KERNEL);
diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c
new file mode 100644
index 000000000000..6829d5961359
--- /dev/null
+++ b/drivers/usb/gadget/langwell_udc.c
@@ -0,0 +1,3373 @@
+/*
+ * Intel Langwell USB Device Controller driver
+ * Copyright (C) 2008-2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+
+/* #undef	DEBUG */
+/* #undef	VERBOSE */
+
+#if defined(CONFIG_USB_LANGWELL_OTG)
+#define	OTG_TRANSCEIVER
+#endif
+
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
+#include <linux/pm.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+#include "langwell_udc.h"
+
+
+#define	DRIVER_DESC		"Intel Langwell USB Device Controller driver"
+#define	DRIVER_VERSION		"16 May 2009"
+
+static const char driver_name[] = "langwell_udc";
+static const char driver_desc[] = DRIVER_DESC;
+
+
+/* controller device global variable */
+static struct langwell_udc	*the_controller;
+
+/* for endpoint 0 operations */
+static const struct usb_endpoint_descriptor
+langwell_ep0_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+	.bEndpointAddress =	0,
+	.bmAttributes =		USB_ENDPOINT_XFER_CONTROL,
+	.wMaxPacketSize =	EP0_MAX_PKT_SIZE,
+};
+
+
+/*-------------------------------------------------------------------------*/
+/* debugging */
+
+#ifdef	DEBUG
+#define	DBG(dev, fmt, args...) \
+	pr_debug("%s %s: " fmt , driver_name, \
+			pci_name(dev->pdev), ## args)
+#else
+#define	DBG(dev, fmt, args...) \
+	do { } while (0)
+#endif /* DEBUG */
+
+
+#ifdef	VERBOSE
+#define	VDBG DBG
+#else
+#define	VDBG(dev, fmt, args...) \
+	do { } while (0)
+#endif	/* VERBOSE */
+
+
+#define	ERROR(dev, fmt, args...) \
+	pr_err("%s %s: " fmt , driver_name, \
+			pci_name(dev->pdev), ## args)
+
+#define	WARNING(dev, fmt, args...) \
+	pr_warning("%s %s: " fmt , driver_name, \
+			pci_name(dev->pdev), ## args)
+
+#define	INFO(dev, fmt, args...) \
+	pr_info("%s %s: " fmt , driver_name, \
+			pci_name(dev->pdev), ## args)
+
+
+#ifdef	VERBOSE
+static inline void print_all_registers(struct langwell_udc *dev)
+{
+	int	i;
+
+	/* Capability Registers */
+	printk(KERN_DEBUG "Capability Registers (offset: "
+			"0x%04x, length: 0x%08x)\n",
+			CAP_REG_OFFSET,
+			(u32)sizeof(struct langwell_cap_regs));
+	printk(KERN_DEBUG "caplength=0x%02x\n",
+			readb(&dev->cap_regs->caplength));
+	printk(KERN_DEBUG "hciversion=0x%04x\n",
+			readw(&dev->cap_regs->hciversion));
+	printk(KERN_DEBUG "hcsparams=0x%08x\n",
+			readl(&dev->cap_regs->hcsparams));
+	printk(KERN_DEBUG "hccparams=0x%08x\n",
+			readl(&dev->cap_regs->hccparams));
+	printk(KERN_DEBUG "dciversion=0x%04x\n",
+			readw(&dev->cap_regs->dciversion));
+	printk(KERN_DEBUG "dccparams=0x%08x\n",
+			readl(&dev->cap_regs->dccparams));
+
+	/* Operational Registers */
+	printk(KERN_DEBUG "Operational Registers (offset: "
+			"0x%04x, length: 0x%08x)\n",
+			OP_REG_OFFSET,
+			(u32)sizeof(struct langwell_op_regs));
+	printk(KERN_DEBUG "extsts=0x%08x\n",
+			readl(&dev->op_regs->extsts));
+	printk(KERN_DEBUG "extintr=0x%08x\n",
+			readl(&dev->op_regs->extintr));
+	printk(KERN_DEBUG "usbcmd=0x%08x\n",
+			readl(&dev->op_regs->usbcmd));
+	printk(KERN_DEBUG "usbsts=0x%08x\n",
+			readl(&dev->op_regs->usbsts));
+	printk(KERN_DEBUG "usbintr=0x%08x\n",
+			readl(&dev->op_regs->usbintr));
+	printk(KERN_DEBUG "frindex=0x%08x\n",
+			readl(&dev->op_regs->frindex));
+	printk(KERN_DEBUG "ctrldssegment=0x%08x\n",
+			readl(&dev->op_regs->ctrldssegment));
+	printk(KERN_DEBUG "deviceaddr=0x%08x\n",
+			readl(&dev->op_regs->deviceaddr));
+	printk(KERN_DEBUG "endpointlistaddr=0x%08x\n",
+			readl(&dev->op_regs->endpointlistaddr));
+	printk(KERN_DEBUG "ttctrl=0x%08x\n",
+			readl(&dev->op_regs->ttctrl));
+	printk(KERN_DEBUG "burstsize=0x%08x\n",
+			readl(&dev->op_regs->burstsize));
+	printk(KERN_DEBUG "txfilltuning=0x%08x\n",
+			readl(&dev->op_regs->txfilltuning));
+	printk(KERN_DEBUG "txttfilltuning=0x%08x\n",
+			readl(&dev->op_regs->txttfilltuning));
+	printk(KERN_DEBUG "ic_usb=0x%08x\n",
+			readl(&dev->op_regs->ic_usb));
+	printk(KERN_DEBUG "ulpi_viewport=0x%08x\n",
+			readl(&dev->op_regs->ulpi_viewport));
+	printk(KERN_DEBUG "configflag=0x%08x\n",
+			readl(&dev->op_regs->configflag));
+	printk(KERN_DEBUG "portsc1=0x%08x\n",
+			readl(&dev->op_regs->portsc1));
+	printk(KERN_DEBUG "devlc=0x%08x\n",
+			readl(&dev->op_regs->devlc));
+	printk(KERN_DEBUG "otgsc=0x%08x\n",
+			readl(&dev->op_regs->otgsc));
+	printk(KERN_DEBUG "usbmode=0x%08x\n",
+			readl(&dev->op_regs->usbmode));
+	printk(KERN_DEBUG "endptnak=0x%08x\n",
+			readl(&dev->op_regs->endptnak));
+	printk(KERN_DEBUG "endptnaken=0x%08x\n",
+			readl(&dev->op_regs->endptnaken));
+	printk(KERN_DEBUG "endptsetupstat=0x%08x\n",
+			readl(&dev->op_regs->endptsetupstat));
+	printk(KERN_DEBUG "endptprime=0x%08x\n",
+			readl(&dev->op_regs->endptprime));
+	printk(KERN_DEBUG "endptflush=0x%08x\n",
+			readl(&dev->op_regs->endptflush));
+	printk(KERN_DEBUG "endptstat=0x%08x\n",
+			readl(&dev->op_regs->endptstat));
+	printk(KERN_DEBUG "endptcomplete=0x%08x\n",
+			readl(&dev->op_regs->endptcomplete));
+
+	for (i = 0; i < dev->ep_max / 2; i++) {
+		printk(KERN_DEBUG "endptctrl[%d]=0x%08x\n",
+				i, readl(&dev->op_regs->endptctrl[i]));
+	}
+}
+#endif /* VERBOSE */
+
+
+/*-------------------------------------------------------------------------*/
+
+#define	DIR_STRING(bAddress)	(((bAddress) & USB_DIR_IN) ? "in" : "out")
+
+#define is_in(ep)	(((ep)->ep_num == 0) ? ((ep)->dev->ep0_dir == \
+			USB_DIR_IN) : ((ep)->desc->bEndpointAddress \
+			& USB_DIR_IN) == USB_DIR_IN)
+
+
+#ifdef	DEBUG
+static char *type_string(u8 bmAttributes)
+{
+	switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_BULK:
+		return "bulk";
+	case USB_ENDPOINT_XFER_ISOC:
+		return "iso";
+	case USB_ENDPOINT_XFER_INT:
+		return "int";
+	};
+
+	return "control";
+}
+#endif
+
+
+/* configure endpoint control registers */
+static void ep_reset(struct langwell_ep *ep, unsigned char ep_num,
+		unsigned char is_in, unsigned char ep_type)
+{
+	struct langwell_udc	*dev;
+	u32			endptctrl;
+
+	dev = ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+	if (is_in) {	/* TX */
+		if (ep_num)
+			endptctrl |= EPCTRL_TXR;
+		endptctrl |= EPCTRL_TXE;
+		endptctrl |= ep_type << EPCTRL_TXT_SHIFT;
+	} else {	/* RX */
+		if (ep_num)
+			endptctrl |= EPCTRL_RXR;
+		endptctrl |= EPCTRL_RXE;
+		endptctrl |= ep_type << EPCTRL_RXT_SHIFT;
+	}
+
+	writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* reset ep0 dQH and endptctrl */
+static void ep0_reset(struct langwell_udc *dev)
+{
+	struct langwell_ep	*ep;
+	int			i;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* ep0 in and out */
+	for (i = 0; i < 2; i++) {
+		ep = &dev->ep[i];
+		ep->dev = dev;
+
+		/* ep0 dQH */
+		ep->dqh = &dev->ep_dqh[i];
+
+		/* configure ep0 endpoint capabilities in dQH */
+		ep->dqh->dqh_ios = 1;
+		ep->dqh->dqh_mpl = EP0_MAX_PKT_SIZE;
+
+		/* FIXME: enable ep0-in HW zero length termination select */
+		if (is_in(ep))
+			ep->dqh->dqh_zlt = 0;
+		ep->dqh->dqh_mult = 0;
+
+		/* configure ep0 control registers */
+		ep_reset(&dev->ep[0], 0, i, USB_ENDPOINT_XFER_CONTROL);
+	}
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoints operations */
+
+/* configure endpoint, making it usable */
+static int langwell_ep_enable(struct usb_ep *_ep,
+		const struct usb_endpoint_descriptor *desc)
+{
+	struct langwell_udc	*dev;
+	struct langwell_ep	*ep;
+	u16			max = 0;
+	unsigned long		flags;
+	int			retval = 0;
+	unsigned char		zlt, ios = 0, mult = 0;
+
+	ep = container_of(_ep, struct langwell_ep, ep);
+	dev = ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (!_ep || !desc || ep->desc
+			|| desc->bDescriptorType != USB_DT_ENDPOINT)
+		return -EINVAL;
+
+	if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
+		return -ESHUTDOWN;
+
+	max = le16_to_cpu(desc->wMaxPacketSize);
+
+	/*
+	 * disable HW zero length termination select
+	 * driver handles zero length packet through req->req.zero
+	 */
+	zlt = 1;
+
+	/*
+	 * sanity check type, direction, address, and then
+	 * initialize the endpoint capabilities fields in dQH
+	 */
+	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		ios = 1;
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+		if ((dev->gadget.speed == USB_SPEED_HIGH
+					&& max != 512)
+				|| (dev->gadget.speed == USB_SPEED_FULL
+					&& max > 64)) {
+			goto done;
+		}
+		break;
+	case USB_ENDPOINT_XFER_INT:
+		if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
+			goto done;
+
+		switch (dev->gadget.speed) {
+		case USB_SPEED_HIGH:
+			if (max <= 1024)
+				break;
+		case USB_SPEED_FULL:
+			if (max <= 64)
+				break;
+		default:
+			if (max <= 8)
+				break;
+			goto done;
+		}
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		if (strstr(ep->ep.name, "-bulk")
+				|| strstr(ep->ep.name, "-int"))
+			goto done;
+
+		switch (dev->gadget.speed) {
+		case USB_SPEED_HIGH:
+			if (max <= 1024)
+				break;
+		case USB_SPEED_FULL:
+			if (max <= 1023)
+				break;
+		default:
+			goto done;
+		}
+		/*
+		 * FIXME:
+		 * calculate transactions needed for high bandwidth iso
+		 */
+		mult = (unsigned char)(1 + ((max >> 11) & 0x03));
+		max = max & 0x8ff;	/* bit 0~10 */
+		/* 3 transactions at most */
+		if (mult > 3)
+			goto done;
+		break;
+	default:
+		goto done;
+	}
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	/* configure endpoint capabilities in dQH */
+	ep->dqh->dqh_ios = ios;
+	ep->dqh->dqh_mpl = cpu_to_le16(max);
+	ep->dqh->dqh_zlt = zlt;
+	ep->dqh->dqh_mult = mult;
+
+	ep->ep.maxpacket = max;
+	ep->desc = desc;
+	ep->stopped = 0;
+	ep->ep_num = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+
+	/* ep_type */
+	ep->ep_type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+
+	/* configure endpoint control registers */
+	ep_reset(ep, ep->ep_num, is_in(ep), ep->ep_type);
+
+	DBG(dev, "enabled %s (ep%d%s-%s), max %04x\n",
+			_ep->name,
+			ep->ep_num,
+			DIR_STRING(desc->bEndpointAddress),
+			type_string(desc->bmAttributes),
+			max);
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+done:
+	VDBG(dev, "<--- %s()\n", __func__);
+	return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* retire a request */
+static void done(struct langwell_ep *ep, struct langwell_request *req,
+		int status)
+{
+	struct langwell_udc	*dev = ep->dev;
+	unsigned		stopped = ep->stopped;
+	struct langwell_dtd	*curr_dtd, *next_dtd;
+	int			i;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* remove the req from ep->queue */
+	list_del_init(&req->queue);
+
+	if (req->req.status == -EINPROGRESS)
+		req->req.status = status;
+	else
+		status = req->req.status;
+
+	/* free dTD for the request */
+	next_dtd = req->head;
+	for (i = 0; i < req->dtd_count; i++) {
+		curr_dtd = next_dtd;
+		if (i != req->dtd_count - 1)
+			next_dtd = curr_dtd->next_dtd_virt;
+		dma_pool_free(dev->dtd_pool, curr_dtd, curr_dtd->dtd_dma);
+	}
+
+	if (req->mapped) {
+		dma_unmap_single(&dev->pdev->dev, req->req.dma, req->req.length,
+			is_in(ep) ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+		req->req.dma = DMA_ADDR_INVALID;
+		req->mapped = 0;
+	} else
+		dma_sync_single_for_cpu(&dev->pdev->dev, req->req.dma,
+				req->req.length,
+				is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+
+	if (status != -ESHUTDOWN)
+		DBG(dev, "complete %s, req %p, stat %d, len %u/%u\n",
+			ep->ep.name, &req->req, status,
+			req->req.actual, req->req.length);
+
+	/* don't modify queue heads during completion callback */
+	ep->stopped = 1;
+
+	spin_unlock(&dev->lock);
+	/* complete routine from gadget driver */
+	if (req->req.complete)
+		req->req.complete(&ep->ep, &req->req);
+
+	spin_lock(&dev->lock);
+	ep->stopped = stopped;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+static void langwell_ep_fifo_flush(struct usb_ep *_ep);
+
+/* delete all endpoint requests, called with spinlock held */
+static void nuke(struct langwell_ep *ep, int status)
+{
+	/* called with spinlock held */
+	ep->stopped = 1;
+
+	/* endpoint fifo flush */
+	if (&ep->ep && ep->desc)
+		langwell_ep_fifo_flush(&ep->ep);
+
+	while (!list_empty(&ep->queue)) {
+		struct langwell_request	*req = NULL;
+		req = list_entry(ep->queue.next, struct langwell_request,
+				queue);
+		done(ep, req, status);
+	}
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoint is no longer usable */
+static int langwell_ep_disable(struct usb_ep *_ep)
+{
+	struct langwell_ep	*ep;
+	unsigned long		flags;
+	struct langwell_udc	*dev;
+	int			ep_num;
+	u32			endptctrl;
+
+	ep = container_of(_ep, struct langwell_ep, ep);
+	dev = ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (!_ep || !ep->desc)
+		return -EINVAL;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	/* disable endpoint control register */
+	ep_num = ep->ep_num;
+	endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+	if (is_in(ep))
+		endptctrl &= ~EPCTRL_TXE;
+	else
+		endptctrl &= ~EPCTRL_RXE;
+	writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+	/* nuke all pending requests (does flush) */
+	nuke(ep, -ESHUTDOWN);
+
+	ep->desc = NULL;
+	ep->stopped = 1;
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	DBG(dev, "disabled %s\n", _ep->name);
+	VDBG(dev, "<--- %s()\n", __func__);
+
+	return 0;
+}
+
+
+/* allocate a request object to use with this endpoint */
+static struct usb_request *langwell_alloc_request(struct usb_ep *_ep,
+		gfp_t gfp_flags)
+{
+	struct langwell_ep	*ep;
+	struct langwell_udc	*dev;
+	struct langwell_request	*req = NULL;
+
+	if (!_ep)
+		return NULL;
+
+	ep = container_of(_ep, struct langwell_ep, ep);
+	dev = ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	req = kzalloc(sizeof(*req), gfp_flags);
+	if (!req)
+		return NULL;
+
+	req->req.dma = DMA_ADDR_INVALID;
+	INIT_LIST_HEAD(&req->queue);
+
+	VDBG(dev, "alloc request for %s\n", _ep->name);
+	VDBG(dev, "<--- %s()\n", __func__);
+	return &req->req;
+}
+
+
+/* free a request object */
+static void langwell_free_request(struct usb_ep *_ep,
+		struct usb_request *_req)
+{
+	struct langwell_ep	*ep;
+	struct langwell_udc	*dev;
+	struct langwell_request	*req = NULL;
+
+	ep = container_of(_ep, struct langwell_ep, ep);
+	dev = ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (!_ep || !_req)
+		return;
+
+	req = container_of(_req, struct langwell_request, req);
+	WARN_ON(!list_empty(&req->queue));
+
+	if (_req)
+		kfree(req);
+
+	VDBG(dev, "free request for %s\n", _ep->name);
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* queue dTD and PRIME endpoint */
+static int queue_dtd(struct langwell_ep *ep, struct langwell_request *req)
+{
+	u32			bit_mask, usbcmd, endptstat, dtd_dma;
+	u8			dtd_status;
+	int			i;
+	struct langwell_dqh	*dqh;
+	struct langwell_udc	*dev;
+
+	dev = ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	i = ep->ep_num * 2 + is_in(ep);
+	dqh = &dev->ep_dqh[i];
+
+	if (ep->ep_num)
+		VDBG(dev, "%s\n", ep->name);
+	else
+		/* ep0 */
+		VDBG(dev, "%s-%s\n", ep->name, is_in(ep) ? "in" : "out");
+
+	VDBG(dev, "ep_dqh[%d] addr: 0x%08x\n", i, (u32)&(dev->ep_dqh[i]));
+
+	bit_mask = is_in(ep) ?
+		(1 << (ep->ep_num + 16)) : (1 << (ep->ep_num));
+
+	VDBG(dev, "bit_mask = 0x%08x\n", bit_mask);
+
+	/* check if the pipe is empty */
+	if (!(list_empty(&ep->queue))) {
+		/* add dTD to the end of linked list */
+		struct langwell_request	*lastreq;
+		lastreq = list_entry(ep->queue.prev,
+				struct langwell_request, queue);
+
+		lastreq->tail->dtd_next =
+			cpu_to_le32(req->head->dtd_dma & DTD_NEXT_MASK);
+
+		/* read prime bit, if 1 goto out */
+		if (readl(&dev->op_regs->endptprime) & bit_mask)
+			goto out;
+
+		do {
+			/* set ATDTW bit in USBCMD */
+			usbcmd = readl(&dev->op_regs->usbcmd);
+			writel(usbcmd | CMD_ATDTW, &dev->op_regs->usbcmd);
+
+			/* read correct status bit */
+			endptstat = readl(&dev->op_regs->endptstat) & bit_mask;
+
+		} while (!(readl(&dev->op_regs->usbcmd) & CMD_ATDTW));
+
+		/* write ATDTW bit to 0 */
+		usbcmd = readl(&dev->op_regs->usbcmd);
+		writel(usbcmd & ~CMD_ATDTW, &dev->op_regs->usbcmd);
+
+		if (endptstat)
+			goto out;
+	}
+
+	/* write dQH next pointer and terminate bit to 0 */
+	dtd_dma = req->head->dtd_dma & DTD_NEXT_MASK;
+	dqh->dtd_next = cpu_to_le32(dtd_dma);
+
+	/* clear active and halt bit */
+	dtd_status = (u8) ~(DTD_STS_ACTIVE | DTD_STS_HALTED);
+	dqh->dtd_status &= dtd_status;
+	VDBG(dev, "dqh->dtd_status = 0x%x\n", dqh->dtd_status);
+
+	/* write 1 to endptprime register to PRIME endpoint */
+	bit_mask = is_in(ep) ? (1 << (ep->ep_num + 16)) : (1 << ep->ep_num);
+	VDBG(dev, "endprime bit_mask = 0x%08x\n", bit_mask);
+	writel(bit_mask, &dev->op_regs->endptprime);
+out:
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* fill in the dTD structure to build a transfer descriptor */
+static struct langwell_dtd *build_dtd(struct langwell_request *req,
+		unsigned *length, dma_addr_t *dma, int *is_last)
+{
+	u32			 buf_ptr;
+	struct langwell_dtd	*dtd;
+	struct langwell_udc	*dev;
+	int			i;
+
+	dev = req->ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* the maximum transfer length, up to 16k bytes */
+	*length = min(req->req.length - req->req.actual,
+			(unsigned)DTD_MAX_TRANSFER_LENGTH);
+
+	/* create dTD dma_pool resource */
+	dtd = dma_pool_alloc(dev->dtd_pool, GFP_KERNEL, dma);
+	if (dtd == NULL)
+		return dtd;
+	dtd->dtd_dma = *dma;
+
+	/* initialize buffer page pointers */
+	buf_ptr = (u32)(req->req.dma + req->req.actual);
+	for (i = 0; i < 5; i++)
+		dtd->dtd_buf[i] = cpu_to_le32(buf_ptr + i * PAGE_SIZE);
+
+	req->req.actual += *length;
+
+	/* fill in total bytes with transfer size */
+	dtd->dtd_total = cpu_to_le16(*length);
+	VDBG(dev, "dtd->dtd_total = %d\n", dtd->dtd_total);
+
+	/* set is_last flag if req->req.zero is set or not */
+	if (req->req.zero) {
+		if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0)
+			*is_last = 1;
+		else
+			*is_last = 0;
+	} else if (req->req.length == req->req.actual) {
+		*is_last = 1;
+	} else
+		*is_last = 0;
+
+	if (*is_last == 0)
+		VDBG(dev, "multi-dtd request!\n");
+
+	/* set interrupt on complete bit for the last dTD */
+	if (*is_last && !req->req.no_interrupt)
+		dtd->dtd_ioc = 1;
+
+	/* set multiplier override 0 for non-ISO and non-TX endpoint */
+	dtd->dtd_multo = 0;
+
+	/* set the active bit of status field to 1 */
+	dtd->dtd_status = DTD_STS_ACTIVE;
+	VDBG(dev, "dtd->dtd_status = 0x%02x\n", dtd->dtd_status);
+
+	VDBG(dev, "length = %d, dma addr= 0x%08x\n", *length, (int)*dma);
+	VDBG(dev, "<--- %s()\n", __func__);
+	return dtd;
+}
+
+
+/* generate dTD linked list for a request */
+static int req_to_dtd(struct langwell_request *req)
+{
+	unsigned		count;
+	int			is_last, is_first = 1;
+	struct langwell_dtd	*dtd, *last_dtd = NULL;
+	struct langwell_udc	*dev;
+	dma_addr_t		dma;
+
+	dev = req->ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+	do {
+		dtd = build_dtd(req, &count, &dma, &is_last);
+		if (dtd == NULL)
+			return -ENOMEM;
+
+		if (is_first) {
+			is_first = 0;
+			req->head = dtd;
+		} else {
+			last_dtd->dtd_next = cpu_to_le32(dma);
+			last_dtd->next_dtd_virt = dtd;
+		}
+		last_dtd = dtd;
+		req->dtd_count++;
+	} while (!is_last);
+
+	/* set terminate bit to 1 for the last dTD */
+	dtd->dtd_next = DTD_TERM;
+
+	req->tail = dtd;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* queue (submits) an I/O requests to an endpoint */
+static int langwell_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
+		gfp_t gfp_flags)
+{
+	struct langwell_request	*req;
+	struct langwell_ep	*ep;
+	struct langwell_udc	*dev;
+	unsigned long		flags;
+	int			is_iso = 0, zlflag = 0;
+
+	/* always require a cpu-view buffer */
+	req = container_of(_req, struct langwell_request, req);
+	ep = container_of(_ep, struct langwell_ep, ep);
+
+	if (!_req || !_req->complete || !_req->buf
+			|| !list_empty(&req->queue)) {
+		return -EINVAL;
+	}
+
+	if (unlikely(!_ep || !ep->desc))
+		return -EINVAL;
+
+	dev = ep->dev;
+	req->ep = ep;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (ep->desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
+		if (req->req.length > ep->ep.maxpacket)
+			return -EMSGSIZE;
+		is_iso = 1;
+	}
+
+	if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
+		return -ESHUTDOWN;
+
+	/* set up dma mapping in case the caller didn't */
+	if (_req->dma == DMA_ADDR_INVALID) {
+		/* WORKAROUND: WARN_ON(size == 0) */
+		if (_req->length == 0) {
+			VDBG(dev, "req->length: 0->1\n");
+			zlflag = 1;
+			_req->length++;
+		}
+
+		_req->dma = dma_map_single(&dev->pdev->dev,
+				_req->buf, _req->length,
+				is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+		if (zlflag && (_req->length == 1)) {
+			VDBG(dev, "req->length: 1->0\n");
+			zlflag = 0;
+			_req->length = 0;
+		}
+
+		req->mapped = 1;
+		VDBG(dev, "req->mapped = 1\n");
+	} else {
+		dma_sync_single_for_device(&dev->pdev->dev,
+				_req->dma, _req->length,
+				is_in(ep) ?  DMA_TO_DEVICE : DMA_FROM_DEVICE);
+		req->mapped = 0;
+		VDBG(dev, "req->mapped = 0\n");
+	}
+
+	DBG(dev, "%s queue req %p, len %u, buf %p, dma 0x%08x\n",
+			_ep->name,
+			_req, _req->length, _req->buf, _req->dma);
+
+	_req->status = -EINPROGRESS;
+	_req->actual = 0;
+	req->dtd_count = 0;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	/* build and put dTDs to endpoint queue */
+	if (!req_to_dtd(req)) {
+		queue_dtd(ep, req);
+	} else {
+		spin_unlock_irqrestore(&dev->lock, flags);
+		return -ENOMEM;
+	}
+
+	/* update ep0 state */
+	if (ep->ep_num == 0)
+		dev->ep0_state = DATA_STATE_XMIT;
+
+	if (likely(req != NULL)) {
+		list_add_tail(&req->queue, &ep->queue);
+		VDBG(dev, "list_add_tail() \n");
+	}
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* dequeue (cancels, unlinks) an I/O request from an endpoint */
+static int langwell_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct langwell_ep	*ep;
+	struct langwell_udc	*dev;
+	struct langwell_request	*req;
+	unsigned long		flags;
+	int			stopped, ep_num, retval = 0;
+	u32			endptctrl;
+
+	ep = container_of(_ep, struct langwell_ep, ep);
+	dev = ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (!_ep || !ep->desc || !_req)
+		return -EINVAL;
+
+	if (!dev->driver)
+		return -ESHUTDOWN;
+
+	spin_lock_irqsave(&dev->lock, flags);
+	stopped = ep->stopped;
+
+	/* quiesce dma while we patch the queue */
+	ep->stopped = 1;
+	ep_num = ep->ep_num;
+
+	/* disable endpoint control register */
+	endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+	if (is_in(ep))
+		endptctrl &= ~EPCTRL_TXE;
+	else
+		endptctrl &= ~EPCTRL_RXE;
+	writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+	/* make sure it's still queued on this endpoint */
+	list_for_each_entry(req, &ep->queue, queue) {
+		if (&req->req == _req)
+			break;
+	}
+
+	if (&req->req != _req) {
+		retval = -EINVAL;
+		goto done;
+	}
+
+	/* queue head may be partially complete. */
+	if (ep->queue.next == &req->queue) {
+		DBG(dev, "unlink (%s) dma\n", _ep->name);
+		_req->status = -ECONNRESET;
+		langwell_ep_fifo_flush(&ep->ep);
+
+		/* not the last request in endpoint queue */
+		if (likely(ep->queue.next == &req->queue)) {
+			struct langwell_dqh	*dqh;
+			struct langwell_request	*next_req;
+
+			dqh = ep->dqh;
+			next_req = list_entry(req->queue.next,
+					struct langwell_request, queue);
+
+			/* point the dQH to the first dTD of next request */
+			writel((u32) next_req->head, &dqh->dqh_current);
+		}
+	} else {
+		struct langwell_request	*prev_req;
+
+		prev_req = list_entry(req->queue.prev,
+				struct langwell_request, queue);
+		writel(readl(&req->tail->dtd_next),
+				&prev_req->tail->dtd_next);
+	}
+
+	done(ep, req, -ECONNRESET);
+
+done:
+	/* enable endpoint again */
+	endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+	if (is_in(ep))
+		endptctrl |= EPCTRL_TXE;
+	else
+		endptctrl |= EPCTRL_RXE;
+	writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+	ep->stopped = stopped;
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoint set/clear halt */
+static void ep_set_halt(struct langwell_ep *ep, int value)
+{
+	u32			endptctrl = 0;
+	int			ep_num;
+	struct langwell_udc	*dev = ep->dev;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	ep_num = ep->ep_num;
+	endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+
+	/* value: 1 - set halt, 0 - clear halt */
+	if (value) {
+		/* set the stall bit */
+		if (is_in(ep))
+			endptctrl |= EPCTRL_TXS;
+		else
+			endptctrl |= EPCTRL_RXS;
+	} else {
+		/* clear the stall bit and reset data toggle */
+		if (is_in(ep)) {
+			endptctrl &= ~EPCTRL_TXS;
+			endptctrl |= EPCTRL_TXR;
+		} else {
+			endptctrl &= ~EPCTRL_RXS;
+			endptctrl |= EPCTRL_RXR;
+		}
+	}
+
+	writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* set the endpoint halt feature */
+static int langwell_ep_set_halt(struct usb_ep *_ep, int value)
+{
+	struct langwell_ep	*ep;
+	struct langwell_udc	*dev;
+	unsigned long		flags;
+	int			retval = 0;
+
+	ep = container_of(_ep, struct langwell_ep, ep);
+	dev = ep->dev;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (!_ep || !ep->desc)
+		return -EINVAL;
+
+	if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
+		return -ESHUTDOWN;
+
+	if (ep->desc && (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+			== USB_ENDPOINT_XFER_ISOC)
+		return  -EOPNOTSUPP;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	/*
+	 * attempt to halt IN ep will fail if any transfer requests
+	 * are still queue
+	 */
+	if (!list_empty(&ep->queue) && is_in(ep) && value) {
+		/* IN endpoint FIFO holds bytes */
+		DBG(dev, "%s FIFO holds bytes\n", _ep->name);
+		retval = -EAGAIN;
+		goto done;
+	}
+
+	/* endpoint set/clear halt */
+	if (ep->ep_num) {
+		ep_set_halt(ep, value);
+	} else { /* endpoint 0 */
+		dev->ep0_state = WAIT_FOR_SETUP;
+		dev->ep0_dir = USB_DIR_OUT;
+	}
+done:
+	spin_unlock_irqrestore(&dev->lock, flags);
+	DBG(dev, "%s %s halt\n", _ep->name, value ? "set" : "clear");
+	VDBG(dev, "<--- %s()\n", __func__);
+	return retval;
+}
+
+
+/* set the halt feature and ignores clear requests */
+static int langwell_ep_set_wedge(struct usb_ep *_ep)
+{
+	struct langwell_ep	*ep;
+	struct langwell_udc	*dev;
+
+	ep = container_of(_ep, struct langwell_ep, ep);
+	dev = ep->dev;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (!_ep || !ep->desc)
+		return -EINVAL;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return usb_ep_set_halt(_ep);
+}
+
+
+/* flush contents of a fifo */
+static void langwell_ep_fifo_flush(struct usb_ep *_ep)
+{
+	struct langwell_ep	*ep;
+	struct langwell_udc	*dev;
+	u32			flush_bit;
+	unsigned long		timeout;
+
+	ep = container_of(_ep, struct langwell_ep, ep);
+	dev = ep->dev;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (!_ep || !ep->desc) {
+		VDBG(dev, "ep or ep->desc is NULL\n");
+		VDBG(dev, "<--- %s()\n", __func__);
+		return;
+	}
+
+	VDBG(dev, "%s-%s fifo flush\n", _ep->name, is_in(ep) ? "in" : "out");
+
+	/* flush endpoint buffer */
+	if (ep->ep_num == 0)
+		flush_bit = (1 << 16) | 1;
+	else if (is_in(ep))
+		flush_bit = 1 << (ep->ep_num + 16);	/* TX */
+	else
+		flush_bit = 1 << ep->ep_num;		/* RX */
+
+	/* wait until flush complete */
+	timeout = jiffies + FLUSH_TIMEOUT;
+	do {
+		writel(flush_bit, &dev->op_regs->endptflush);
+		while (readl(&dev->op_regs->endptflush)) {
+			if (time_after(jiffies, timeout)) {
+				ERROR(dev, "ep flush timeout\n");
+				goto done;
+			}
+			cpu_relax();
+		}
+	} while (readl(&dev->op_regs->endptstat) & flush_bit);
+done:
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* endpoints operations structure */
+static const struct usb_ep_ops langwell_ep_ops = {
+
+	/* configure endpoint, making it usable */
+	.enable		= langwell_ep_enable,
+
+	/* endpoint is no longer usable */
+	.disable	= langwell_ep_disable,
+
+	/* allocate a request object to use with this endpoint */
+	.alloc_request	= langwell_alloc_request,
+
+	/* free a request object */
+	.free_request	= langwell_free_request,
+
+	/* queue (submits) an I/O requests to an endpoint */
+	.queue		= langwell_ep_queue,
+
+	/* dequeue (cancels, unlinks) an I/O request from an endpoint */
+	.dequeue	= langwell_ep_dequeue,
+
+	/* set the endpoint halt feature */
+	.set_halt	= langwell_ep_set_halt,
+
+	/* set the halt feature and ignores clear requests */
+	.set_wedge	= langwell_ep_set_wedge,
+
+	/* flush contents of a fifo */
+	.fifo_flush	= langwell_ep_fifo_flush,
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device controller usb_gadget_ops structure */
+
+/* returns the current frame number */
+static int langwell_get_frame(struct usb_gadget *_gadget)
+{
+	struct langwell_udc	*dev;
+	u16			retval;
+
+	if (!_gadget)
+		return -ENODEV;
+
+	dev = container_of(_gadget, struct langwell_udc, gadget);
+	VDBG(dev, "---> %s()\n", __func__);
+
+	retval = readl(&dev->op_regs->frindex) & FRINDEX_MASK;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return retval;
+}
+
+
+/* tries to wake up the host connected to this gadget */
+static int langwell_wakeup(struct usb_gadget *_gadget)
+{
+	struct langwell_udc	*dev;
+	u32 			portsc1, devlc;
+	unsigned long   	flags;
+
+	if (!_gadget)
+		return 0;
+
+	dev = container_of(_gadget, struct langwell_udc, gadget);
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* Remote Wakeup feature not enabled by host */
+	if (!dev->remote_wakeup)
+		return -ENOTSUPP;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	portsc1 = readl(&dev->op_regs->portsc1);
+	if (!(portsc1 & PORTS_SUSP)) {
+		spin_unlock_irqrestore(&dev->lock, flags);
+		return 0;
+	}
+
+	/* LPM L1 to L0, remote wakeup */
+	if (dev->lpm && dev->lpm_state == LPM_L1) {
+		portsc1 |= PORTS_SLP;
+		writel(portsc1, &dev->op_regs->portsc1);
+	}
+
+	/* force port resume */
+	if (dev->usb_state == USB_STATE_SUSPENDED) {
+		portsc1 |= PORTS_FPR;
+		writel(portsc1, &dev->op_regs->portsc1);
+	}
+
+	/* exit PHY low power suspend */
+	devlc = readl(&dev->op_regs->devlc);
+	VDBG(dev, "devlc = 0x%08x\n", devlc);
+	devlc &= ~LPM_PHCD;
+	writel(devlc, &dev->op_regs->devlc);
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* notify controller that VBUS is powered or not */
+static int langwell_vbus_session(struct usb_gadget *_gadget, int is_active)
+{
+	struct langwell_udc	*dev;
+	unsigned long		flags;
+	u32             	usbcmd;
+
+	if (!_gadget)
+		return -ENODEV;
+
+	dev = container_of(_gadget, struct langwell_udc, gadget);
+	VDBG(dev, "---> %s()\n", __func__);
+
+	spin_lock_irqsave(&dev->lock, flags);
+	VDBG(dev, "VBUS status: %s\n", is_active ? "on" : "off");
+
+	dev->vbus_active = (is_active != 0);
+	if (dev->driver && dev->softconnected && dev->vbus_active) {
+		usbcmd = readl(&dev->op_regs->usbcmd);
+		usbcmd |= CMD_RUNSTOP;
+		writel(usbcmd, &dev->op_regs->usbcmd);
+	} else {
+		usbcmd = readl(&dev->op_regs->usbcmd);
+		usbcmd &= ~CMD_RUNSTOP;
+		writel(usbcmd, &dev->op_regs->usbcmd);
+	}
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* constrain controller's VBUS power usage */
+static int langwell_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
+{
+	struct langwell_udc	*dev;
+
+	if (!_gadget)
+		return -ENODEV;
+
+	dev = container_of(_gadget, struct langwell_udc, gadget);
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (dev->transceiver) {
+		VDBG(dev, "otg_set_power\n");
+		VDBG(dev, "<--- %s()\n", __func__);
+		return otg_set_power(dev->transceiver, mA);
+	}
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return -ENOTSUPP;
+}
+
+
+/* D+ pullup, software-controlled connect/disconnect to USB host */
+static int langwell_pullup(struct usb_gadget *_gadget, int is_on)
+{
+	struct langwell_udc	*dev;
+	u32             	usbcmd;
+	unsigned long   	flags;
+
+	if (!_gadget)
+		return -ENODEV;
+
+	dev = container_of(_gadget, struct langwell_udc, gadget);
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	spin_lock_irqsave(&dev->lock, flags);
+	dev->softconnected = (is_on != 0);
+
+	if (dev->driver && dev->softconnected && dev->vbus_active) {
+		usbcmd = readl(&dev->op_regs->usbcmd);
+		usbcmd |= CMD_RUNSTOP;
+		writel(usbcmd, &dev->op_regs->usbcmd);
+	} else {
+		usbcmd = readl(&dev->op_regs->usbcmd);
+		usbcmd &= ~CMD_RUNSTOP;
+		writel(usbcmd, &dev->op_regs->usbcmd);
+	}
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* device controller usb_gadget_ops structure */
+static const struct usb_gadget_ops langwell_ops = {
+
+	/* returns the current frame number */
+	.get_frame	= langwell_get_frame,
+
+	/* tries to wake up the host connected to this gadget */
+	.wakeup		= langwell_wakeup,
+
+	/* set the device selfpowered feature, always selfpowered */
+	/* .set_selfpowered = langwell_set_selfpowered, */
+
+	/* notify controller that VBUS is powered or not */
+	.vbus_session	= langwell_vbus_session,
+
+	/* constrain controller's VBUS power usage */
+	.vbus_draw	= langwell_vbus_draw,
+
+	/* D+ pullup, software-controlled connect/disconnect to USB host */
+	.pullup		= langwell_pullup,
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device controller operations */
+
+/* reset device controller */
+static int langwell_udc_reset(struct langwell_udc *dev)
+{
+	u32		usbcmd, usbmode, devlc, endpointlistaddr;
+	unsigned long	timeout;
+
+	if (!dev)
+		return -EINVAL;
+
+	DBG(dev, "---> %s()\n", __func__);
+
+	/* set controller to stop state */
+	usbcmd = readl(&dev->op_regs->usbcmd);
+	usbcmd &= ~CMD_RUNSTOP;
+	writel(usbcmd, &dev->op_regs->usbcmd);
+
+	/* reset device controller */
+	usbcmd = readl(&dev->op_regs->usbcmd);
+	usbcmd |= CMD_RST;
+	writel(usbcmd, &dev->op_regs->usbcmd);
+
+	/* wait for reset to complete */
+	timeout = jiffies + RESET_TIMEOUT;
+	while (readl(&dev->op_regs->usbcmd) & CMD_RST) {
+		if (time_after(jiffies, timeout)) {
+			ERROR(dev, "device reset timeout\n");
+			return -ETIMEDOUT;
+		}
+		cpu_relax();
+	}
+
+	/* set controller to device mode */
+	usbmode = readl(&dev->op_regs->usbmode);
+	usbmode |= MODE_DEVICE;
+
+	/* turn setup lockout off, require setup tripwire in usbcmd */
+	usbmode |= MODE_SLOM;
+
+	writel(usbmode, &dev->op_regs->usbmode);
+	usbmode = readl(&dev->op_regs->usbmode);
+	VDBG(dev, "usbmode=0x%08x\n", usbmode);
+
+	/* Write-Clear setup status */
+	writel(0, &dev->op_regs->usbsts);
+
+	/* if support USB LPM, ACK all LPM token */
+	if (dev->lpm) {
+		devlc = readl(&dev->op_regs->devlc);
+		devlc &= ~LPM_STL;	/* don't STALL LPM token */
+		devlc &= ~LPM_NYT_ACK;	/* ACK LPM token */
+		writel(devlc, &dev->op_regs->devlc);
+	}
+
+	/* fill endpointlistaddr register */
+	endpointlistaddr = dev->ep_dqh_dma;
+	endpointlistaddr &= ENDPOINTLISTADDR_MASK;
+	writel(endpointlistaddr, &dev->op_regs->endpointlistaddr);
+
+	VDBG(dev, "dQH base (vir: %p, phy: 0x%08x), endpointlistaddr=0x%08x\n",
+			dev->ep_dqh, endpointlistaddr,
+			readl(&dev->op_regs->endpointlistaddr));
+	DBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* reinitialize device controller endpoints */
+static int eps_reinit(struct langwell_udc *dev)
+{
+	struct langwell_ep	*ep;
+	char			name[14];
+	int			i;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* initialize ep0 */
+	ep = &dev->ep[0];
+	ep->dev = dev;
+	strncpy(ep->name, "ep0", sizeof(ep->name));
+	ep->ep.name = ep->name;
+	ep->ep.ops = &langwell_ep_ops;
+	ep->stopped = 0;
+	ep->ep.maxpacket = EP0_MAX_PKT_SIZE;
+	ep->ep_num = 0;
+	ep->desc = &langwell_ep0_desc;
+	INIT_LIST_HEAD(&ep->queue);
+
+	ep->ep_type = USB_ENDPOINT_XFER_CONTROL;
+
+	/* initialize other endpoints */
+	for (i = 2; i < dev->ep_max; i++) {
+		ep = &dev->ep[i];
+		if (i % 2)
+			snprintf(name, sizeof(name), "ep%din", i / 2);
+		else
+			snprintf(name, sizeof(name), "ep%dout", i / 2);
+		ep->dev = dev;
+		strncpy(ep->name, name, sizeof(ep->name));
+		ep->ep.name = ep->name;
+
+		ep->ep.ops = &langwell_ep_ops;
+		ep->stopped = 0;
+		ep->ep.maxpacket = (unsigned short) ~0;
+		ep->ep_num = i / 2;
+
+		INIT_LIST_HEAD(&ep->queue);
+		list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
+
+		ep->dqh = &dev->ep_dqh[i];
+	}
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* enable interrupt and set controller to run state */
+static void langwell_udc_start(struct langwell_udc *dev)
+{
+	u32	usbintr, usbcmd;
+	DBG(dev, "---> %s()\n", __func__);
+
+	/* enable interrupts */
+	usbintr = INTR_ULPIE	/* ULPI */
+		| INTR_SLE	/* suspend */
+		/* | INTR_SRE	SOF received */
+		| INTR_URE	/* USB reset */
+		| INTR_AAE	/* async advance */
+		| INTR_SEE	/* system error */
+		| INTR_FRE	/* frame list rollover */
+		| INTR_PCE	/* port change detect */
+		| INTR_UEE	/* USB error interrupt */
+		| INTR_UE;	/* USB interrupt */
+	writel(usbintr, &dev->op_regs->usbintr);
+
+	/* clear stopped bit */
+	dev->stopped = 0;
+
+	/* set controller to run */
+	usbcmd = readl(&dev->op_regs->usbcmd);
+	usbcmd |= CMD_RUNSTOP;
+	writel(usbcmd, &dev->op_regs->usbcmd);
+
+	DBG(dev, "<--- %s()\n", __func__);
+	return;
+}
+
+
+/* disable interrupt and set controller to stop state */
+static void langwell_udc_stop(struct langwell_udc *dev)
+{
+	u32	usbcmd;
+
+	DBG(dev, "---> %s()\n", __func__);
+
+	/* disable all interrupts */
+	writel(0, &dev->op_regs->usbintr);
+
+	/* set stopped bit */
+	dev->stopped = 1;
+
+	/* set controller to stop state */
+	usbcmd = readl(&dev->op_regs->usbcmd);
+	usbcmd &= ~CMD_RUNSTOP;
+	writel(usbcmd, &dev->op_regs->usbcmd);
+
+	DBG(dev, "<--- %s()\n", __func__);
+	return;
+}
+
+
+/* stop all USB activities */
+static void stop_activity(struct langwell_udc *dev,
+		struct usb_gadget_driver *driver)
+{
+	struct langwell_ep	*ep;
+	DBG(dev, "---> %s()\n", __func__);
+
+	nuke(&dev->ep[0], -ESHUTDOWN);
+
+	list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+		nuke(ep, -ESHUTDOWN);
+	}
+
+	/* report disconnect; the driver is already quiesced */
+	if (driver) {
+		spin_unlock(&dev->lock);
+		driver->disconnect(&dev->gadget);
+		spin_lock(&dev->lock);
+	}
+
+	DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device "function" sysfs attribute file */
+static ssize_t show_function(struct device *_dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct langwell_udc	*dev = the_controller;
+
+	if (!dev->driver || !dev->driver->function
+			|| strlen(dev->driver->function) > PAGE_SIZE)
+		return 0;
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
+}
+static DEVICE_ATTR(function, S_IRUGO, show_function, NULL);
+
+
+/* device "langwell_udc" sysfs attribute file */
+static ssize_t show_langwell_udc(struct device *_dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct langwell_udc	*dev = the_controller;
+	struct langwell_request *req;
+	struct langwell_ep	*ep = NULL;
+	char			*next;
+	unsigned		size;
+	unsigned		t;
+	unsigned		i;
+	unsigned long		flags;
+	u32			tmp_reg;
+
+	next = buf;
+	size = PAGE_SIZE;
+	spin_lock_irqsave(&dev->lock, flags);
+
+	/* driver basic information */
+	t = scnprintf(next, size,
+			DRIVER_DESC "\n"
+			"%s version: %s\n"
+			"Gadget driver: %s\n\n",
+			driver_name, DRIVER_VERSION,
+			dev->driver ? dev->driver->driver.name : "(none)");
+	size -= t;
+	next += t;
+
+	/* device registers */
+	tmp_reg = readl(&dev->op_regs->usbcmd);
+	t = scnprintf(next, size,
+			"USBCMD reg:\n"
+			"SetupTW: %d\n"
+			"Run/Stop: %s\n\n",
+			(tmp_reg & CMD_SUTW) ? 1 : 0,
+			(tmp_reg & CMD_RUNSTOP) ? "Run" : "Stop");
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->usbsts);
+	t = scnprintf(next, size,
+			"USB Status Reg:\n"
+			"Device Suspend: %d\n"
+			"Reset Received: %d\n"
+			"System Error: %s\n"
+			"USB Error Interrupt: %s\n\n",
+			(tmp_reg & STS_SLI) ? 1 : 0,
+			(tmp_reg & STS_URI) ? 1 : 0,
+			(tmp_reg & STS_SEI) ? "Error" : "No error",
+			(tmp_reg & STS_UEI) ? "Error detected" : "No error");
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->usbintr);
+	t = scnprintf(next, size,
+			"USB Intrrupt Enable Reg:\n"
+			"Sleep Enable: %d\n"
+			"SOF Received Enable: %d\n"
+			"Reset Enable: %d\n"
+			"System Error Enable: %d\n"
+			"Port Change Dectected Enable: %d\n"
+			"USB Error Intr Enable: %d\n"
+			"USB Intr Enable: %d\n\n",
+			(tmp_reg & INTR_SLE) ? 1 : 0,
+			(tmp_reg & INTR_SRE) ? 1 : 0,
+			(tmp_reg & INTR_URE) ? 1 : 0,
+			(tmp_reg & INTR_SEE) ? 1 : 0,
+			(tmp_reg & INTR_PCE) ? 1 : 0,
+			(tmp_reg & INTR_UEE) ? 1 : 0,
+			(tmp_reg & INTR_UE) ? 1 : 0);
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->frindex);
+	t = scnprintf(next, size,
+			"USB Frame Index Reg:\n"
+			"Frame Number is 0x%08x\n\n",
+			(tmp_reg & FRINDEX_MASK));
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->deviceaddr);
+	t = scnprintf(next, size,
+			"USB Device Address Reg:\n"
+			"Device Addr is 0x%x\n\n",
+			USBADR(tmp_reg));
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->endpointlistaddr);
+	t = scnprintf(next, size,
+			"USB Endpoint List Address Reg:\n"
+			"Endpoint List Pointer is 0x%x\n\n",
+			EPBASE(tmp_reg));
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->portsc1);
+	t = scnprintf(next, size,
+		"USB Port Status & Control Reg:\n"
+		"Port Reset: %s\n"
+		"Port Suspend Mode: %s\n"
+		"Over-current Change: %s\n"
+		"Port Enable/Disable Change: %s\n"
+		"Port Enabled/Disabled: %s\n"
+		"Current Connect Status: %s\n\n",
+		(tmp_reg & PORTS_PR) ? "Reset" : "Not Reset",
+		(tmp_reg & PORTS_SUSP) ? "Suspend " : "Not Suspend",
+		(tmp_reg & PORTS_OCC) ? "Detected" : "No",
+		(tmp_reg & PORTS_PEC) ? "Changed" : "Not Changed",
+		(tmp_reg & PORTS_PE) ? "Enable" : "Not Correct",
+		(tmp_reg & PORTS_CCS) ?  "Attached" : "Not Attached");
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->devlc);
+	t = scnprintf(next, size,
+		"Device LPM Control Reg:\n"
+		"Parallel Transceiver : %d\n"
+		"Serial Transceiver : %d\n"
+		"Port Speed: %s\n"
+		"Port Force Full Speed Connenct: %s\n"
+		"PHY Low Power Suspend Clock Disable: %s\n"
+		"BmAttributes: %d\n\n",
+		LPM_PTS(tmp_reg),
+		(tmp_reg & LPM_STS) ? 1 : 0,
+		({
+			char	*s;
+			switch (LPM_PSPD(tmp_reg)) {
+			case LPM_SPEED_FULL:
+				s = "Full Speed"; break;
+			case LPM_SPEED_LOW:
+				s = "Low Speed"; break;
+			case LPM_SPEED_HIGH:
+				s = "High Speed"; break;
+			default:
+				s = "Unknown Speed"; break;
+			}
+			s;
+		}),
+		(tmp_reg & LPM_PFSC) ? "Force Full Speed" : "Not Force",
+		(tmp_reg & LPM_PHCD) ? "Disabled" : "Enabled",
+		LPM_BA(tmp_reg));
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->usbmode);
+	t = scnprintf(next, size,
+			"USB Mode Reg:\n"
+			"Controller Mode is : %s\n\n", ({
+				char *s;
+				switch (MODE_CM(tmp_reg)) {
+				case MODE_IDLE:
+					s = "Idle"; break;
+				case MODE_DEVICE:
+					s = "Device Controller"; break;
+				case MODE_HOST:
+					s = "Host Controller"; break;
+				default:
+					s = "None"; break;
+				}
+				s;
+			}));
+	size -= t;
+	next += t;
+
+	tmp_reg = readl(&dev->op_regs->endptsetupstat);
+	t = scnprintf(next, size,
+			"Endpoint Setup Status Reg:\n"
+			"SETUP on ep 0x%04x\n\n",
+			tmp_reg & SETUPSTAT_MASK);
+	size -= t;
+	next += t;
+
+	for (i = 0; i < dev->ep_max / 2; i++) {
+		tmp_reg = readl(&dev->op_regs->endptctrl[i]);
+		t = scnprintf(next, size, "EP Ctrl Reg [%d]: 0x%08x\n",
+				i, tmp_reg);
+		size -= t;
+		next += t;
+	}
+	tmp_reg = readl(&dev->op_regs->endptprime);
+	t = scnprintf(next, size, "EP Prime Reg: 0x%08x\n\n", tmp_reg);
+	size -= t;
+	next += t;
+
+	/* langwell_udc, langwell_ep, langwell_request structure information */
+	ep = &dev->ep[0];
+	t = scnprintf(next, size, "%s MaxPacketSize: 0x%x, ep_num: %d\n",
+			ep->ep.name, ep->ep.maxpacket, ep->ep_num);
+	size -= t;
+	next += t;
+
+	if (list_empty(&ep->queue)) {
+		t = scnprintf(next, size, "its req queue is empty\n\n");
+		size -= t;
+		next += t;
+	} else {
+		list_for_each_entry(req, &ep->queue, queue) {
+			t = scnprintf(next, size,
+				"req %p actual 0x%x length 0x%x  buf %p\n",
+				&req->req, req->req.actual,
+				req->req.length, req->req.buf);
+			size -= t;
+			next += t;
+		}
+	}
+	/* other gadget->eplist ep */
+	list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+		if (ep->desc) {
+			t = scnprintf(next, size,
+					"\n%s MaxPacketSize: 0x%x, "
+					"ep_num: %d\n",
+					ep->ep.name, ep->ep.maxpacket,
+					ep->ep_num);
+			size -= t;
+			next += t;
+
+			if (list_empty(&ep->queue)) {
+				t = scnprintf(next, size,
+						"its req queue is empty\n\n");
+				size -= t;
+				next += t;
+			} else {
+				list_for_each_entry(req, &ep->queue, queue) {
+					t = scnprintf(next, size,
+						"req %p actual 0x%x length "
+						"0x%x  buf %p\n",
+						&req->req, req->req.actual,
+						req->req.length, req->req.buf);
+					size -= t;
+					next += t;
+				}
+			}
+		}
+	}
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+	return PAGE_SIZE - size;
+}
+static DEVICE_ATTR(langwell_udc, S_IRUGO, show_langwell_udc, NULL);
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * when a driver is successfully registered, it will receive
+ * control requests including set_configuration(), which enables
+ * non-control requests.  then usb traffic follows until a
+ * disconnect is reported.  then a host may connect again, or
+ * the driver might get unbound.
+ */
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+	struct langwell_udc	*dev = the_controller;
+	unsigned long		flags;
+	int			retval;
+
+	if (!dev)
+		return -ENODEV;
+
+	DBG(dev, "---> %s()\n", __func__);
+
+	if (dev->driver)
+		return -EBUSY;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	/* hook up the driver ... */
+	driver->driver.bus = NULL;
+	dev->driver = driver;
+	dev->gadget.dev.driver = &driver->driver;
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	retval = driver->bind(&dev->gadget);
+	if (retval) {
+		DBG(dev, "bind to driver %s --> %d\n",
+				driver->driver.name, retval);
+		dev->driver = NULL;
+		dev->gadget.dev.driver = NULL;
+		return retval;
+	}
+
+	retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
+	if (retval)
+		goto err_unbind;
+
+	dev->usb_state = USB_STATE_ATTACHED;
+	dev->ep0_state = WAIT_FOR_SETUP;
+	dev->ep0_dir = USB_DIR_OUT;
+
+	/* enable interrupt and set controller to run state */
+	if (dev->got_irq)
+		langwell_udc_start(dev);
+
+	VDBG(dev, "After langwell_udc_start(), print all registers:\n");
+#ifdef	VERBOSE
+	print_all_registers(dev);
+#endif
+
+	INFO(dev, "register driver: %s\n", driver->driver.name);
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+
+err_unbind:
+	driver->unbind(&dev->gadget);
+	dev->gadget.dev.driver = NULL;
+	dev->driver = NULL;
+
+	DBG(dev, "<--- %s()\n", __func__);
+	return retval;
+}
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+
+/* unregister gadget driver */
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+	struct langwell_udc	*dev = the_controller;
+	unsigned long		flags;
+
+	if (!dev)
+		return -ENODEV;
+
+	DBG(dev, "---> %s()\n", __func__);
+
+	if (unlikely(!driver || !driver->bind || !driver->unbind))
+		return -EINVAL;
+
+	/* unbind OTG transceiver */
+	if (dev->transceiver)
+		(void)otg_set_peripheral(dev->transceiver, 0);
+
+	/* disable interrupt and set controller to stop state */
+	langwell_udc_stop(dev);
+
+	dev->usb_state = USB_STATE_ATTACHED;
+	dev->ep0_state = WAIT_FOR_SETUP;
+	dev->ep0_dir = USB_DIR_OUT;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	/* stop all usb activities */
+	dev->gadget.speed = USB_SPEED_UNKNOWN;
+	stop_activity(dev, driver);
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	/* unbind gadget driver */
+	driver->unbind(&dev->gadget);
+	dev->gadget.dev.driver = NULL;
+	dev->driver = NULL;
+
+	device_remove_file(&dev->pdev->dev, &dev_attr_function);
+
+	INFO(dev, "unregistered driver '%s'\n", driver->driver.name);
+	DBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * setup tripwire is used as a semaphore to ensure that the setup data
+ * payload is extracted from a dQH without being corrupted
+ */
+static void setup_tripwire(struct langwell_udc *dev)
+{
+	u32			usbcmd,
+				endptsetupstat;
+	unsigned long		timeout;
+	struct langwell_dqh	*dqh;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* ep0 OUT dQH */
+	dqh = &dev->ep_dqh[EP_DIR_OUT];
+
+	/* Write-Clear endptsetupstat */
+	endptsetupstat = readl(&dev->op_regs->endptsetupstat);
+	writel(endptsetupstat, &dev->op_regs->endptsetupstat);
+
+	/* wait until endptsetupstat is cleared */
+	timeout = jiffies + SETUPSTAT_TIMEOUT;
+	while (readl(&dev->op_regs->endptsetupstat)) {
+		if (time_after(jiffies, timeout)) {
+			ERROR(dev, "setup_tripwire timeout\n");
+			break;
+		}
+		cpu_relax();
+	}
+
+	/* while a hazard exists when setup packet arrives */
+	do {
+		/* set setup tripwire bit */
+		usbcmd = readl(&dev->op_regs->usbcmd);
+		writel(usbcmd | CMD_SUTW, &dev->op_regs->usbcmd);
+
+		/* copy the setup packet to local buffer */
+		memcpy(&dev->local_setup_buff, &dqh->dqh_setup, 8);
+	} while (!(readl(&dev->op_regs->usbcmd) & CMD_SUTW));
+
+	/* Write-Clear setup tripwire bit */
+	usbcmd = readl(&dev->op_regs->usbcmd);
+	writel(usbcmd & ~CMD_SUTW, &dev->op_regs->usbcmd);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* protocol ep0 stall, will automatically be cleared on new transaction */
+static void ep0_stall(struct langwell_udc *dev)
+{
+	u32	endptctrl;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* set TX and RX to stall */
+	endptctrl = readl(&dev->op_regs->endptctrl[0]);
+	endptctrl |= EPCTRL_TXS | EPCTRL_RXS;
+	writel(endptctrl, &dev->op_regs->endptctrl[0]);
+
+	/* update ep0 state */
+	dev->ep0_state = WAIT_FOR_SETUP;
+	dev->ep0_dir = USB_DIR_OUT;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* PRIME a status phase for ep0 */
+static int prime_status_phase(struct langwell_udc *dev, int dir)
+{
+	struct langwell_request	*req;
+	struct langwell_ep	*ep;
+	int			status = 0;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (dir == EP_DIR_IN)
+		dev->ep0_dir = USB_DIR_IN;
+	else
+		dev->ep0_dir = USB_DIR_OUT;
+
+	ep = &dev->ep[0];
+	dev->ep0_state = WAIT_FOR_OUT_STATUS;
+
+	req = dev->status_req;
+
+	req->ep = ep;
+	req->req.length = 0;
+	req->req.status = -EINPROGRESS;
+	req->req.actual = 0;
+	req->req.complete = NULL;
+	req->dtd_count = 0;
+
+	if (!req_to_dtd(req))
+		status = queue_dtd(ep, req);
+	else
+		return -ENOMEM;
+
+	if (status)
+		ERROR(dev, "can't queue ep0 status request\n");
+
+	list_add_tail(&req->queue, &ep->queue);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return status;
+}
+
+
+/* SET_ADDRESS request routine */
+static void set_address(struct langwell_udc *dev, u16 value,
+		u16 index, u16 length)
+{
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* save the new address to device struct */
+	dev->dev_addr = (u8) value;
+	VDBG(dev, "dev->dev_addr = %d\n", dev->dev_addr);
+
+	/* update usb state */
+	dev->usb_state = USB_STATE_ADDRESS;
+
+	/* STATUS phase */
+	if (prime_status_phase(dev, EP_DIR_IN))
+		ep0_stall(dev);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* return endpoint by windex */
+static struct langwell_ep *get_ep_by_windex(struct langwell_udc *dev,
+		u16 wIndex)
+{
+	struct langwell_ep		*ep;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
+		return &dev->ep[0];
+
+	list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+		u8	bEndpointAddress;
+		if (!ep->desc)
+			continue;
+
+		bEndpointAddress = ep->desc->bEndpointAddress;
+		if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
+			continue;
+
+		if ((wIndex & USB_ENDPOINT_NUMBER_MASK)
+			== (bEndpointAddress & USB_ENDPOINT_NUMBER_MASK))
+			return ep;
+	}
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return NULL;
+}
+
+
+/* return whether endpoint is stalled, 0: not stalled; 1: stalled */
+static int ep_is_stall(struct langwell_ep *ep)
+{
+	struct langwell_udc	*dev = ep->dev;
+	u32			endptctrl;
+	int			retval;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	endptctrl = readl(&dev->op_regs->endptctrl[ep->ep_num]);
+	if (is_in(ep))
+		retval = endptctrl & EPCTRL_TXS ? 1 : 0;
+	else
+		retval = endptctrl & EPCTRL_RXS ? 1 : 0;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return retval;
+}
+
+
+/* GET_STATUS request routine */
+static void get_status(struct langwell_udc *dev, u8 request_type, u16 value,
+		u16 index, u16 length)
+{
+	struct langwell_request	*req;
+	struct langwell_ep	*ep;
+	u16	status_data = 0;	/* 16 bits cpu view status data */
+	int	status = 0;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	ep = &dev->ep[0];
+
+	if ((request_type & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
+		/* get device status */
+		status_data = 1 << USB_DEVICE_SELF_POWERED;
+		status_data |= dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP;
+	} else if ((request_type & USB_RECIP_MASK) == USB_RECIP_INTERFACE) {
+		/* get interface status */
+		status_data = 0;
+	} else if ((request_type & USB_RECIP_MASK) == USB_RECIP_ENDPOINT) {
+		/* get endpoint status */
+		struct langwell_ep	*epn;
+		epn = get_ep_by_windex(dev, index);
+		/* stall if endpoint doesn't exist */
+		if (!epn)
+			goto stall;
+
+		status_data = ep_is_stall(epn) << USB_ENDPOINT_HALT;
+	}
+
+	dev->ep0_dir = USB_DIR_IN;
+
+	/* borrow the per device status_req */
+	req = dev->status_req;
+
+	/* fill in the reqest structure */
+	*((u16 *) req->req.buf) = cpu_to_le16(status_data);
+	req->ep = ep;
+	req->req.length = 2;
+	req->req.status = -EINPROGRESS;
+	req->req.actual = 0;
+	req->req.complete = NULL;
+	req->dtd_count = 0;
+
+	/* prime the data phase */
+	if (!req_to_dtd(req))
+		status = queue_dtd(ep, req);
+	else			/* no mem */
+		goto stall;
+
+	if (status) {
+		ERROR(dev, "response error on GET_STATUS request\n");
+		goto stall;
+	}
+
+	list_add_tail(&req->queue, &ep->queue);
+	dev->ep0_state = DATA_STATE_XMIT;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return;
+stall:
+	ep0_stall(dev);
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* setup packet interrupt handler */
+static void handle_setup_packet(struct langwell_udc *dev,
+		struct usb_ctrlrequest *setup)
+{
+	u16	wValue = le16_to_cpu(setup->wValue);
+	u16	wIndex = le16_to_cpu(setup->wIndex);
+	u16	wLength = le16_to_cpu(setup->wLength);
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* ep0 fifo flush */
+	nuke(&dev->ep[0], -ESHUTDOWN);
+
+	DBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
+			setup->bRequestType, setup->bRequest,
+			wValue, wIndex, wLength);
+
+	/* RNDIS gadget delegate */
+	if ((setup->bRequestType == 0x21) && (setup->bRequest == 0x00)) {
+		/* USB_CDC_SEND_ENCAPSULATED_COMMAND */
+		goto delegate;
+	}
+
+	/* USB_CDC_GET_ENCAPSULATED_RESPONSE */
+	if ((setup->bRequestType == 0xa1) && (setup->bRequest == 0x01)) {
+		/* USB_CDC_GET_ENCAPSULATED_RESPONSE */
+		goto delegate;
+	}
+
+	/* We process some stardard setup requests here */
+	switch (setup->bRequest) {
+	case USB_REQ_GET_STATUS:
+		DBG(dev, "SETUP: USB_REQ_GET_STATUS\n");
+		/* get status, DATA and STATUS phase */
+		if ((setup->bRequestType & (USB_DIR_IN | USB_TYPE_MASK))
+					!= (USB_DIR_IN | USB_TYPE_STANDARD))
+			break;
+		get_status(dev, setup->bRequestType, wValue, wIndex, wLength);
+		goto end;
+
+	case USB_REQ_SET_ADDRESS:
+		DBG(dev, "SETUP: USB_REQ_SET_ADDRESS\n");
+		/* STATUS phase */
+		if (setup->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD
+						| USB_RECIP_DEVICE))
+			break;
+		set_address(dev, wValue, wIndex, wLength);
+		goto end;
+
+	case USB_REQ_CLEAR_FEATURE:
+	case USB_REQ_SET_FEATURE:
+		/* STATUS phase */
+	{
+		int rc = -EOPNOTSUPP;
+		if (setup->bRequest == USB_REQ_SET_FEATURE)
+			DBG(dev, "SETUP: USB_REQ_SET_FEATURE\n");
+		else if (setup->bRequest == USB_REQ_CLEAR_FEATURE)
+			DBG(dev, "SETUP: USB_REQ_CLEAR_FEATURE\n");
+
+		if ((setup->bRequestType & (USB_RECIP_MASK | USB_TYPE_MASK))
+				== (USB_RECIP_ENDPOINT | USB_TYPE_STANDARD)) {
+			struct langwell_ep	*epn;
+			epn = get_ep_by_windex(dev, wIndex);
+			/* stall if endpoint doesn't exist */
+			if (!epn) {
+				ep0_stall(dev);
+				goto end;
+			}
+
+			if (wValue != 0 || wLength != 0
+					|| epn->ep_num > dev->ep_max)
+				break;
+
+			spin_unlock(&dev->lock);
+			rc = langwell_ep_set_halt(&epn->ep,
+					(setup->bRequest == USB_REQ_SET_FEATURE)
+						? 1 : 0);
+			spin_lock(&dev->lock);
+
+		} else if ((setup->bRequestType & (USB_RECIP_MASK
+				| USB_TYPE_MASK)) == (USB_RECIP_DEVICE
+				| USB_TYPE_STANDARD)) {
+			if (!gadget_is_otg(&dev->gadget))
+				break;
+			else if (setup->bRequest == USB_DEVICE_B_HNP_ENABLE) {
+				dev->gadget.b_hnp_enable = 1;
+#ifdef	OTG_TRANSCEIVER
+				if (!dev->lotg->otg.default_a)
+					dev->lotg->hsm.b_hnp_enable = 1;
+#endif
+			} else if (setup->bRequest == USB_DEVICE_A_HNP_SUPPORT)
+				dev->gadget.a_hnp_support = 1;
+			else if (setup->bRequest ==
+					USB_DEVICE_A_ALT_HNP_SUPPORT)
+				dev->gadget.a_alt_hnp_support = 1;
+			else
+				break;
+			rc = 0;
+		} else
+			break;
+
+		if (rc == 0) {
+			if (prime_status_phase(dev, EP_DIR_IN))
+				ep0_stall(dev);
+		}
+		goto end;
+	}
+
+	case USB_REQ_GET_DESCRIPTOR:
+		DBG(dev, "SETUP: USB_REQ_GET_DESCRIPTOR\n");
+		goto delegate;
+
+	case USB_REQ_SET_DESCRIPTOR:
+		DBG(dev, "SETUP: USB_REQ_SET_DESCRIPTOR unsupported\n");
+		goto delegate;
+
+	case USB_REQ_GET_CONFIGURATION:
+		DBG(dev, "SETUP: USB_REQ_GET_CONFIGURATION\n");
+		goto delegate;
+
+	case USB_REQ_SET_CONFIGURATION:
+		DBG(dev, "SETUP: USB_REQ_SET_CONFIGURATION\n");
+		goto delegate;
+
+	case USB_REQ_GET_INTERFACE:
+		DBG(dev, "SETUP: USB_REQ_GET_INTERFACE\n");
+		goto delegate;
+
+	case USB_REQ_SET_INTERFACE:
+		DBG(dev, "SETUP: USB_REQ_SET_INTERFACE\n");
+		goto delegate;
+
+	case USB_REQ_SYNCH_FRAME:
+		DBG(dev, "SETUP: USB_REQ_SYNCH_FRAME unsupported\n");
+		goto delegate;
+
+	default:
+		/* delegate USB standard requests to the gadget driver */
+		goto delegate;
+delegate:
+		/* USB requests handled by gadget */
+		if (wLength) {
+			/* DATA phase from gadget, STATUS phase from udc */
+			dev->ep0_dir = (setup->bRequestType & USB_DIR_IN)
+					?  USB_DIR_IN : USB_DIR_OUT;
+			VDBG(dev, "dev->ep0_dir = 0x%x, wLength = %d\n",
+					dev->ep0_dir, wLength);
+			spin_unlock(&dev->lock);
+			if (dev->driver->setup(&dev->gadget,
+					&dev->local_setup_buff) < 0)
+				ep0_stall(dev);
+			spin_lock(&dev->lock);
+			dev->ep0_state = (setup->bRequestType & USB_DIR_IN)
+					?  DATA_STATE_XMIT : DATA_STATE_RECV;
+		} else {
+			/* no DATA phase, IN STATUS phase from gadget */
+			dev->ep0_dir = USB_DIR_IN;
+			VDBG(dev, "dev->ep0_dir = 0x%x, wLength = %d\n",
+					dev->ep0_dir, wLength);
+			spin_unlock(&dev->lock);
+			if (dev->driver->setup(&dev->gadget,
+					&dev->local_setup_buff) < 0)
+				ep0_stall(dev);
+			spin_lock(&dev->lock);
+			dev->ep0_state = WAIT_FOR_OUT_STATUS;
+		}
+		break;
+	}
+end:
+	VDBG(dev, "<--- %s()\n", __func__);
+	return;
+}
+
+
+/* transfer completion, process endpoint request and free the completed dTDs
+ * for this request
+ */
+static int process_ep_req(struct langwell_udc *dev, int index,
+		struct langwell_request *curr_req)
+{
+	struct langwell_dtd	*curr_dtd;
+	struct langwell_dqh	*curr_dqh;
+	int			td_complete, actual, remaining_length;
+	int			i, dir;
+	u8			dtd_status = 0;
+	int			retval = 0;
+
+	curr_dqh = &dev->ep_dqh[index];
+	dir = index % 2;
+
+	curr_dtd = curr_req->head;
+	td_complete = 0;
+	actual = curr_req->req.length;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	for (i = 0; i < curr_req->dtd_count; i++) {
+		remaining_length = le16_to_cpu(curr_dtd->dtd_total);
+		actual -= remaining_length;
+
+		/* command execution states by dTD */
+		dtd_status = curr_dtd->dtd_status;
+
+		if (!dtd_status) {
+			/* transfers completed successfully */
+			if (!remaining_length) {
+				td_complete++;
+				VDBG(dev, "dTD transmitted successfully\n");
+			} else {
+				if (dir) {
+					VDBG(dev, "TX dTD remains data\n");
+					retval = -EPROTO;
+					break;
+
+				} else {
+					td_complete++;
+					break;
+				}
+			}
+		} else {
+			/* transfers completed with errors */
+			if (dtd_status & DTD_STS_ACTIVE) {
+				DBG(dev, "request not completed\n");
+				retval = 1;
+				return retval;
+			} else if (dtd_status & DTD_STS_HALTED) {
+				ERROR(dev, "dTD error %08x dQH[%d]\n",
+						dtd_status, index);
+				/* clear the errors and halt condition */
+				curr_dqh->dtd_status = 0;
+				retval = -EPIPE;
+				break;
+			} else if (dtd_status & DTD_STS_DBE) {
+				DBG(dev, "data buffer (overflow) error\n");
+				retval = -EPROTO;
+				break;
+			} else if (dtd_status & DTD_STS_TRE) {
+				DBG(dev, "transaction(ISO) error\n");
+				retval = -EILSEQ;
+				break;
+			} else
+				ERROR(dev, "unknown error (0x%x)!\n",
+						dtd_status);
+		}
+
+		if (i != curr_req->dtd_count - 1)
+			curr_dtd = (struct langwell_dtd *)
+				curr_dtd->next_dtd_virt;
+	}
+
+	if (retval)
+		return retval;
+
+	curr_req->req.actual = actual;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* complete DATA or STATUS phase of ep0 prime status phase if needed */
+static void ep0_req_complete(struct langwell_udc *dev,
+		struct langwell_ep *ep0, struct langwell_request *req)
+{
+	u32	new_addr;
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (dev->usb_state == USB_STATE_ADDRESS) {
+		/* set the new address */
+		new_addr = (u32)dev->dev_addr;
+		writel(new_addr << USBADR_SHIFT, &dev->op_regs->deviceaddr);
+
+		new_addr = USBADR(readl(&dev->op_regs->deviceaddr));
+		VDBG(dev, "new_addr = %d\n", new_addr);
+	}
+
+	done(ep0, req, 0);
+
+	switch (dev->ep0_state) {
+	case DATA_STATE_XMIT:
+		/* receive status phase */
+		if (prime_status_phase(dev, EP_DIR_OUT))
+			ep0_stall(dev);
+		break;
+	case DATA_STATE_RECV:
+		/* send status phase */
+		if (prime_status_phase(dev, EP_DIR_IN))
+			ep0_stall(dev);
+		break;
+	case WAIT_FOR_OUT_STATUS:
+		dev->ep0_state = WAIT_FOR_SETUP;
+		break;
+	case WAIT_FOR_SETUP:
+		ERROR(dev, "unexpect ep0 packets\n");
+		break;
+	default:
+		ep0_stall(dev);
+		break;
+	}
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB transfer completion interrupt */
+static void handle_trans_complete(struct langwell_udc *dev)
+{
+	u32			complete_bits;
+	int			i, ep_num, dir, bit_mask, status;
+	struct langwell_ep	*epn;
+	struct langwell_request	*curr_req, *temp_req;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	complete_bits = readl(&dev->op_regs->endptcomplete);
+	VDBG(dev, "endptcomplete register: 0x%08x\n", complete_bits);
+
+	/* Write-Clear the bits in endptcomplete register */
+	writel(complete_bits, &dev->op_regs->endptcomplete);
+
+	if (!complete_bits) {
+		DBG(dev, "complete_bits = 0\n");
+		goto done;
+	}
+
+	for (i = 0; i < dev->ep_max; i++) {
+		ep_num = i / 2;
+		dir = i % 2;
+
+		bit_mask = 1 << (ep_num + 16 * dir);
+
+		if (!(complete_bits & bit_mask))
+			continue;
+
+		/* ep0 */
+		if (i == 1)
+			epn = &dev->ep[0];
+		else
+			epn = &dev->ep[i];
+
+		if (epn->name == NULL) {
+			WARNING(dev, "invalid endpoint\n");
+			continue;
+		}
+
+		if (i < 2)
+			/* ep0 in and out */
+			DBG(dev, "%s-%s transfer completed\n",
+					epn->name,
+					is_in(epn) ? "in" : "out");
+		else
+			DBG(dev, "%s transfer completed\n", epn->name);
+
+		/* process the req queue until an uncomplete request */
+		list_for_each_entry_safe(curr_req, temp_req,
+				&epn->queue, queue) {
+			status = process_ep_req(dev, i, curr_req);
+			VDBG(dev, "%s req status: %d\n", epn->name, status);
+
+			if (status)
+				break;
+
+			/* write back status to req */
+			curr_req->req.status = status;
+
+			/* ep0 request completion */
+			if (ep_num == 0) {
+				ep0_req_complete(dev, epn, curr_req);
+				break;
+			} else {
+				done(epn, curr_req, status);
+			}
+		}
+	}
+done:
+	VDBG(dev, "<--- %s()\n", __func__);
+	return;
+}
+
+
+/* port change detect interrupt handler */
+static void handle_port_change(struct langwell_udc *dev)
+{
+	u32	portsc1, devlc;
+	u32	speed;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (dev->bus_reset)
+		dev->bus_reset = 0;
+
+	portsc1 = readl(&dev->op_regs->portsc1);
+	devlc = readl(&dev->op_regs->devlc);
+	VDBG(dev, "portsc1 = 0x%08x, devlc = 0x%08x\n",
+			portsc1, devlc);
+
+	/* bus reset is finished */
+	if (!(portsc1 & PORTS_PR)) {
+		/* get the speed */
+		speed = LPM_PSPD(devlc);
+		switch (speed) {
+		case LPM_SPEED_HIGH:
+			dev->gadget.speed = USB_SPEED_HIGH;
+			break;
+		case LPM_SPEED_FULL:
+			dev->gadget.speed = USB_SPEED_FULL;
+			break;
+		case LPM_SPEED_LOW:
+			dev->gadget.speed = USB_SPEED_LOW;
+			break;
+		default:
+			dev->gadget.speed = USB_SPEED_UNKNOWN;
+			break;
+		}
+		VDBG(dev, "speed = %d, dev->gadget.speed = %d\n",
+				speed, dev->gadget.speed);
+	}
+
+	/* LPM L0 to L1 */
+	if (dev->lpm && dev->lpm_state == LPM_L0)
+		if (portsc1 & PORTS_SUSP && portsc1 & PORTS_SLP) {
+				INFO(dev, "LPM L0 to L1\n");
+				dev->lpm_state = LPM_L1;
+		}
+
+	/* LPM L1 to L0, force resume or remote wakeup finished */
+	if (dev->lpm && dev->lpm_state == LPM_L1)
+		if (!(portsc1 & PORTS_SUSP)) {
+			if (portsc1 & PORTS_SLP)
+				INFO(dev, "LPM L1 to L0, force resume\n");
+			else
+				INFO(dev, "LPM L1 to L0, remote wakeup\n");
+
+			dev->lpm_state = LPM_L0;
+		}
+
+	/* update USB state */
+	if (!dev->resume_state)
+		dev->usb_state = USB_STATE_DEFAULT;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB reset interrupt handler */
+static void handle_usb_reset(struct langwell_udc *dev)
+{
+	u32		deviceaddr,
+			endptsetupstat,
+			endptcomplete;
+	unsigned long	timeout;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	/* Write-Clear the device address */
+	deviceaddr = readl(&dev->op_regs->deviceaddr);
+	writel(deviceaddr & ~USBADR_MASK, &dev->op_regs->deviceaddr);
+
+	dev->dev_addr = 0;
+
+	/* clear usb state */
+	dev->resume_state = 0;
+
+	/* LPM L1 to L0, reset */
+	if (dev->lpm)
+		dev->lpm_state = LPM_L0;
+
+	dev->ep0_dir = USB_DIR_OUT;
+	dev->ep0_state = WAIT_FOR_SETUP;
+	dev->remote_wakeup = 0;		/* default to 0 on reset */
+	dev->gadget.b_hnp_enable = 0;
+	dev->gadget.a_hnp_support = 0;
+	dev->gadget.a_alt_hnp_support = 0;
+
+	/* Write-Clear all the setup token semaphores */
+	endptsetupstat = readl(&dev->op_regs->endptsetupstat);
+	writel(endptsetupstat, &dev->op_regs->endptsetupstat);
+
+	/* Write-Clear all the endpoint complete status bits */
+	endptcomplete = readl(&dev->op_regs->endptcomplete);
+	writel(endptcomplete, &dev->op_regs->endptcomplete);
+
+	/* wait until all endptprime bits cleared */
+	timeout = jiffies + PRIME_TIMEOUT;
+	while (readl(&dev->op_regs->endptprime)) {
+		if (time_after(jiffies, timeout)) {
+			ERROR(dev, "USB reset timeout\n");
+			break;
+		}
+		cpu_relax();
+	}
+
+	/* write 1s to endptflush register to clear any primed buffers */
+	writel((u32) ~0, &dev->op_regs->endptflush);
+
+	if (readl(&dev->op_regs->portsc1) & PORTS_PR) {
+		VDBG(dev, "USB bus reset\n");
+		/* bus is reseting */
+		dev->bus_reset = 1;
+
+		/* reset all the queues, stop all USB activities */
+		stop_activity(dev, dev->driver);
+		dev->usb_state = USB_STATE_DEFAULT;
+	} else {
+		VDBG(dev, "device controller reset\n");
+		/* controller reset */
+		langwell_udc_reset(dev);
+
+		/* reset all the queues, stop all USB activities */
+		stop_activity(dev, dev->driver);
+
+		/* reset ep0 dQH and endptctrl */
+		ep0_reset(dev);
+
+		/* enable interrupt and set controller to run state */
+		langwell_udc_start(dev);
+
+		dev->usb_state = USB_STATE_ATTACHED;
+	}
+
+#ifdef	OTG_TRANSCEIVER
+	/* refer to USB OTG 6.6.2.3 b_hnp_en is cleared */
+	if (!dev->lotg->otg.default_a)
+		dev->lotg->hsm.b_hnp_enable = 0;
+#endif
+
+	VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB bus suspend/resume interrupt */
+static void handle_bus_suspend(struct langwell_udc *dev)
+{
+	u32		devlc;
+	DBG(dev, "---> %s()\n", __func__);
+
+	dev->resume_state = dev->usb_state;
+	dev->usb_state = USB_STATE_SUSPENDED;
+
+#ifdef	OTG_TRANSCEIVER
+	if (dev->lotg->otg.default_a) {
+		if (dev->lotg->hsm.b_bus_suspend_vld == 1) {
+			dev->lotg->hsm.b_bus_suspend = 1;
+			/* notify transceiver the state changes */
+			if (spin_trylock(&dev->lotg->wq_lock)) {
+				langwell_update_transceiver();
+				spin_unlock(&dev->lotg->wq_lock);
+			}
+		}
+		dev->lotg->hsm.b_bus_suspend_vld++;
+	} else {
+		if (!dev->lotg->hsm.a_bus_suspend) {
+			dev->lotg->hsm.a_bus_suspend = 1;
+			/* notify transceiver the state changes */
+			if (spin_trylock(&dev->lotg->wq_lock)) {
+				langwell_update_transceiver();
+				spin_unlock(&dev->lotg->wq_lock);
+			}
+		}
+	}
+#endif
+
+	/* report suspend to the driver */
+	if (dev->driver) {
+		if (dev->driver->suspend) {
+			spin_unlock(&dev->lock);
+			dev->driver->suspend(&dev->gadget);
+			spin_lock(&dev->lock);
+			DBG(dev, "suspend %s\n", dev->driver->driver.name);
+		}
+	}
+
+	/* enter PHY low power suspend */
+	devlc = readl(&dev->op_regs->devlc);
+	VDBG(dev, "devlc = 0x%08x\n", devlc);
+	devlc |= LPM_PHCD;
+	writel(devlc, &dev->op_regs->devlc);
+
+	DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+static void handle_bus_resume(struct langwell_udc *dev)
+{
+	u32		devlc;
+	DBG(dev, "---> %s()\n", __func__);
+
+	dev->usb_state = dev->resume_state;
+	dev->resume_state = 0;
+
+	/* exit PHY low power suspend */
+	devlc = readl(&dev->op_regs->devlc);
+	VDBG(dev, "devlc = 0x%08x\n", devlc);
+	devlc &= ~LPM_PHCD;
+	writel(devlc, &dev->op_regs->devlc);
+
+#ifdef	OTG_TRANSCEIVER
+	if (dev->lotg->otg.default_a == 0)
+		dev->lotg->hsm.a_bus_suspend = 0;
+#endif
+
+	/* report resume to the driver */
+	if (dev->driver) {
+		if (dev->driver->resume) {
+			spin_unlock(&dev->lock);
+			dev->driver->resume(&dev->gadget);
+			spin_lock(&dev->lock);
+			DBG(dev, "resume %s\n", dev->driver->driver.name);
+		}
+	}
+
+	DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB device controller interrupt handler */
+static irqreturn_t langwell_irq(int irq, void *_dev)
+{
+	struct langwell_udc	*dev = _dev;
+	u32			usbsts,
+				usbintr,
+				irq_sts,
+				portsc1;
+
+	VDBG(dev, "---> %s()\n", __func__);
+
+	if (dev->stopped) {
+		VDBG(dev, "handle IRQ_NONE\n");
+		VDBG(dev, "<--- %s()\n", __func__);
+		return IRQ_NONE;
+	}
+
+	spin_lock(&dev->lock);
+
+	/* USB status */
+	usbsts = readl(&dev->op_regs->usbsts);
+
+	/* USB interrupt enable */
+	usbintr = readl(&dev->op_regs->usbintr);
+
+	irq_sts = usbsts & usbintr;
+	VDBG(dev, "usbsts = 0x%08x, usbintr = 0x%08x, irq_sts = 0x%08x\n",
+			usbsts, usbintr, irq_sts);
+
+	if (!irq_sts) {
+		VDBG(dev, "handle IRQ_NONE\n");
+		VDBG(dev, "<--- %s()\n", __func__);
+		spin_unlock(&dev->lock);
+		return IRQ_NONE;
+	}
+
+	/* Write-Clear interrupt status bits */
+	writel(irq_sts, &dev->op_regs->usbsts);
+
+	/* resume from suspend */
+	portsc1 = readl(&dev->op_regs->portsc1);
+	if (dev->usb_state == USB_STATE_SUSPENDED)
+		if (!(portsc1 & PORTS_SUSP))
+			handle_bus_resume(dev);
+
+	/* USB interrupt */
+	if (irq_sts & STS_UI) {
+		VDBG(dev, "USB interrupt\n");
+
+		/* setup packet received from ep0 */
+		if (readl(&dev->op_regs->endptsetupstat)
+				& EP0SETUPSTAT_MASK) {
+			VDBG(dev, "USB SETUP packet received interrupt\n");
+			/* setup tripwire semaphone */
+			setup_tripwire(dev);
+			handle_setup_packet(dev, &dev->local_setup_buff);
+		}
+
+		/* USB transfer completion */
+		if (readl(&dev->op_regs->endptcomplete)) {
+			VDBG(dev, "USB transfer completion interrupt\n");
+			handle_trans_complete(dev);
+		}
+	}
+
+	/* SOF received interrupt (for ISO transfer) */
+	if (irq_sts & STS_SRI) {
+		/* FIXME */
+		/* VDBG(dev, "SOF received interrupt\n"); */
+	}
+
+	/* port change detect interrupt */
+	if (irq_sts & STS_PCI) {
+		VDBG(dev, "port change detect interrupt\n");
+		handle_port_change(dev);
+	}
+
+	/* suspend interrrupt */
+	if (irq_sts & STS_SLI) {
+		VDBG(dev, "suspend interrupt\n");
+		handle_bus_suspend(dev);
+	}
+
+	/* USB reset interrupt */
+	if (irq_sts & STS_URI) {
+		VDBG(dev, "USB reset interrupt\n");
+		handle_usb_reset(dev);
+	}
+
+	/* USB error or system error interrupt */
+	if (irq_sts & (STS_UEI | STS_SEI)) {
+		/* FIXME */
+		WARNING(dev, "error IRQ, irq_sts: %x\n", irq_sts);
+	}
+
+	spin_unlock(&dev->lock);
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return IRQ_HANDLED;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* release device structure */
+static void gadget_release(struct device *_dev)
+{
+	struct langwell_udc	*dev = the_controller;
+
+	DBG(dev, "---> %s()\n", __func__);
+
+	complete(dev->done);
+
+	DBG(dev, "<--- %s()\n", __func__);
+	kfree(dev);
+}
+
+
+/* tear down the binding between this driver and the pci device */
+static void langwell_udc_remove(struct pci_dev *pdev)
+{
+	struct langwell_udc	*dev = the_controller;
+
+	DECLARE_COMPLETION(done);
+
+	BUG_ON(dev->driver);
+	DBG(dev, "---> %s()\n", __func__);
+
+	dev->done = &done;
+
+	/* free memory allocated in probe */
+	if (dev->dtd_pool)
+		dma_pool_destroy(dev->dtd_pool);
+
+	if (dev->status_req) {
+		kfree(dev->status_req->req.buf);
+		kfree(dev->status_req);
+	}
+
+	if (dev->ep_dqh)
+		dma_free_coherent(&pdev->dev, dev->ep_dqh_size,
+			dev->ep_dqh, dev->ep_dqh_dma);
+
+	kfree(dev->ep);
+
+	/* diable IRQ handler */
+	if (dev->got_irq)
+		free_irq(pdev->irq, dev);
+
+#ifndef	OTG_TRANSCEIVER
+	if (dev->cap_regs)
+		iounmap(dev->cap_regs);
+
+	if (dev->region)
+		release_mem_region(pci_resource_start(pdev, 0),
+				pci_resource_len(pdev, 0));
+
+	if (dev->enabled)
+		pci_disable_device(pdev);
+#else
+	if (dev->transceiver) {
+		otg_put_transceiver(dev->transceiver);
+		dev->transceiver = NULL;
+		dev->lotg = NULL;
+	}
+#endif
+
+	dev->cap_regs = NULL;
+
+	INFO(dev, "unbind\n");
+	DBG(dev, "<--- %s()\n", __func__);
+
+	device_unregister(&dev->gadget.dev);
+	device_remove_file(&pdev->dev, &dev_attr_langwell_udc);
+
+#ifndef	OTG_TRANSCEIVER
+	pci_set_drvdata(pdev, NULL);
+#endif
+
+	/* free dev, wait for the release() finished */
+	wait_for_completion(&done);
+
+	the_controller = NULL;
+}
+
+
+/*
+ * wrap this driver around the specified device, but
+ * don't respond over USB until a gadget driver binds to us.
+ */
+static int langwell_udc_probe(struct pci_dev *pdev,
+		const struct pci_device_id *id)
+{
+	struct langwell_udc	*dev;
+#ifndef	OTG_TRANSCEIVER
+	unsigned long		resource, len;
+#endif
+	void			__iomem *base = NULL;
+	size_t			size;
+	int			retval;
+
+	if (the_controller) {
+		dev_warn(&pdev->dev, "ignoring\n");
+		return -EBUSY;
+	}
+
+	/* alloc, and start init */
+	dev = kzalloc(sizeof *dev, GFP_KERNEL);
+	if (dev == NULL) {
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	/* initialize device spinlock */
+	spin_lock_init(&dev->lock);
+
+	dev->pdev = pdev;
+	DBG(dev, "---> %s()\n", __func__);
+
+#ifdef	OTG_TRANSCEIVER
+	/* PCI device is already enabled by otg_transceiver driver */
+	dev->enabled = 1;
+
+	/* mem region and register base */
+	dev->region = 1;
+	dev->transceiver = otg_get_transceiver();
+	dev->lotg = otg_to_langwell(dev->transceiver);
+	base = dev->lotg->regs;
+#else
+	pci_set_drvdata(pdev, dev);
+
+	/* now all the pci goodies ... */
+	if (pci_enable_device(pdev) < 0) {
+		retval = -ENODEV;
+		goto error;
+	}
+	dev->enabled = 1;
+
+	/* control register: BAR 0 */
+	resource = pci_resource_start(pdev, 0);
+	len = pci_resource_len(pdev, 0);
+	if (!request_mem_region(resource, len, driver_name)) {
+		ERROR(dev, "controller already in use\n");
+		retval = -EBUSY;
+		goto error;
+	}
+	dev->region = 1;
+
+	base = ioremap_nocache(resource, len);
+#endif
+	if (base == NULL) {
+		ERROR(dev, "can't map memory\n");
+		retval = -EFAULT;
+		goto error;
+	}
+
+	dev->cap_regs = (struct langwell_cap_regs __iomem *) base;
+	VDBG(dev, "dev->cap_regs: %p\n", dev->cap_regs);
+	dev->op_regs = (struct langwell_op_regs __iomem *)
+		(base + OP_REG_OFFSET);
+	VDBG(dev, "dev->op_regs: %p\n", dev->op_regs);
+
+	/* irq setup after old hardware is cleaned up */
+	if (!pdev->irq) {
+		ERROR(dev, "No IRQ. Check PCI setup!\n");
+		retval = -ENODEV;
+		goto error;
+	}
+
+#ifndef	OTG_TRANSCEIVER
+	INFO(dev, "irq %d, io mem: 0x%08lx, len: 0x%08lx, pci mem 0x%p\n",
+			pdev->irq, resource, len, base);
+	/* enables bus-mastering for device dev */
+	pci_set_master(pdev);
+
+	if (request_irq(pdev->irq, langwell_irq, IRQF_SHARED,
+				driver_name, dev) != 0) {
+		ERROR(dev, "request interrupt %d failed\n", pdev->irq);
+		retval = -EBUSY;
+		goto error;
+	}
+	dev->got_irq = 1;
+#endif
+
+	/* set stopped bit */
+	dev->stopped = 1;
+
+	/* capabilities and endpoint number */
+	dev->lpm = (readl(&dev->cap_regs->hccparams) & HCC_LEN) ? 1 : 0;
+	dev->dciversion = readw(&dev->cap_regs->dciversion);
+	dev->devcap = (readl(&dev->cap_regs->dccparams) & DEVCAP) ? 1 : 0;
+	VDBG(dev, "dev->lpm: %d\n", dev->lpm);
+	VDBG(dev, "dev->dciversion: 0x%04x\n", dev->dciversion);
+	VDBG(dev, "dccparams: 0x%08x\n", readl(&dev->cap_regs->dccparams));
+	VDBG(dev, "dev->devcap: %d\n", dev->devcap);
+	if (!dev->devcap) {
+		ERROR(dev, "can't support device mode\n");
+		retval = -ENODEV;
+		goto error;
+	}
+
+	/* a pair of endpoints (out/in) for each address */
+	dev->ep_max = DEN(readl(&dev->cap_regs->dccparams)) * 2;
+	VDBG(dev, "dev->ep_max: %d\n", dev->ep_max);
+
+	/* allocate endpoints memory */
+	dev->ep = kzalloc(sizeof(struct langwell_ep) * dev->ep_max,
+			GFP_KERNEL);
+	if (!dev->ep) {
+		ERROR(dev, "allocate endpoints memory failed\n");
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	/* allocate device dQH memory */
+	size = dev->ep_max * sizeof(struct langwell_dqh);
+	VDBG(dev, "orig size = %d\n", size);
+	if (size < DQH_ALIGNMENT)
+		size = DQH_ALIGNMENT;
+	else if ((size % DQH_ALIGNMENT) != 0) {
+		size += DQH_ALIGNMENT + 1;
+		size &= ~(DQH_ALIGNMENT - 1);
+	}
+	dev->ep_dqh = dma_alloc_coherent(&pdev->dev, size,
+					&dev->ep_dqh_dma, GFP_KERNEL);
+	if (!dev->ep_dqh) {
+		ERROR(dev, "allocate dQH memory failed\n");
+		retval = -ENOMEM;
+		goto error;
+	}
+	dev->ep_dqh_size = size;
+	VDBG(dev, "ep_dqh_size = %d\n", dev->ep_dqh_size);
+
+	/* initialize ep0 status request structure */
+	dev->status_req = kzalloc(sizeof(struct langwell_request), GFP_KERNEL);
+	if (!dev->status_req) {
+		ERROR(dev, "allocate status_req memory failed\n");
+		retval = -ENOMEM;
+		goto error;
+	}
+	INIT_LIST_HEAD(&dev->status_req->queue);
+
+	/* allocate a small amount of memory to get valid address */
+	dev->status_req->req.buf = kmalloc(8, GFP_KERNEL);
+	dev->status_req->req.dma = virt_to_phys(dev->status_req->req.buf);
+
+	dev->resume_state = USB_STATE_NOTATTACHED;
+	dev->usb_state = USB_STATE_POWERED;
+	dev->ep0_dir = USB_DIR_OUT;
+	dev->remote_wakeup = 0;	/* default to 0 on reset */
+
+#ifndef	OTG_TRANSCEIVER
+	/* reset device controller */
+	langwell_udc_reset(dev);
+#endif
+
+	/* initialize gadget structure */
+	dev->gadget.ops = &langwell_ops;	/* usb_gadget_ops */
+	dev->gadget.ep0 = &dev->ep[0].ep;	/* gadget ep0 */
+	INIT_LIST_HEAD(&dev->gadget.ep_list);	/* ep_list */
+	dev->gadget.speed = USB_SPEED_UNKNOWN;	/* speed */
+	dev->gadget.is_dualspeed = 1;		/* support dual speed */
+#ifdef	OTG_TRANSCEIVER
+	dev->gadget.is_otg = 1;			/* support otg mode */
+#endif
+
+	/* the "gadget" abstracts/virtualizes the controller */
+	dev_set_name(&dev->gadget.dev, "gadget");
+	dev->gadget.dev.parent = &pdev->dev;
+	dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
+	dev->gadget.dev.release = gadget_release;
+	dev->gadget.name = driver_name;		/* gadget name */
+
+	/* controller endpoints reinit */
+	eps_reinit(dev);
+
+#ifndef	OTG_TRANSCEIVER
+	/* reset ep0 dQH and endptctrl */
+	ep0_reset(dev);
+#endif
+
+	/* create dTD dma_pool resource */
+	dev->dtd_pool = dma_pool_create("langwell_dtd",
+			&dev->pdev->dev,
+			sizeof(struct langwell_dtd),
+			DTD_ALIGNMENT,
+			DMA_BOUNDARY);
+
+	if (!dev->dtd_pool) {
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	/* done */
+	INFO(dev, "%s\n", driver_desc);
+	INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
+	INFO(dev, "Driver version: " DRIVER_VERSION "\n");
+	INFO(dev, "Support (max) %d endpoints\n", dev->ep_max);
+	INFO(dev, "Device interface version: 0x%04x\n", dev->dciversion);
+	INFO(dev, "Controller mode: %s\n", dev->devcap ? "Device" : "Host");
+	INFO(dev, "Support USB LPM: %s\n", dev->lpm ? "Yes" : "No");
+
+	VDBG(dev, "After langwell_udc_probe(), print all registers:\n");
+#ifdef	VERBOSE
+	print_all_registers(dev);
+#endif
+
+	the_controller = dev;
+
+	retval = device_register(&dev->gadget.dev);
+	if (retval)
+		goto error;
+
+	retval = device_create_file(&pdev->dev, &dev_attr_langwell_udc);
+	if (retval)
+		goto error;
+
+	VDBG(dev, "<--- %s()\n", __func__);
+	return 0;
+
+error:
+	if (dev) {
+		DBG(dev, "<--- %s()\n", __func__);
+		langwell_udc_remove(pdev);
+	}
+
+	return retval;
+}
+
+
+/* device controller suspend */
+static int langwell_udc_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct langwell_udc	*dev = the_controller;
+	u32			devlc;
+
+	DBG(dev, "---> %s()\n", __func__);
+
+	/* disable interrupt and set controller to stop state */
+	langwell_udc_stop(dev);
+
+	/* diable IRQ handler */
+	if (dev->got_irq)
+		free_irq(pdev->irq, dev);
+	dev->got_irq = 0;
+
+
+	/* save PCI state */
+	pci_save_state(pdev);
+
+	/* set device power state */
+	pci_set_power_state(pdev, PCI_D3hot);
+
+	/* enter PHY low power suspend */
+	devlc = readl(&dev->op_regs->devlc);
+	VDBG(dev, "devlc = 0x%08x\n", devlc);
+	devlc |= LPM_PHCD;
+	writel(devlc, &dev->op_regs->devlc);
+
+	DBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* device controller resume */
+static int langwell_udc_resume(struct pci_dev *pdev)
+{
+	struct langwell_udc	*dev = the_controller;
+	u32			devlc;
+
+	DBG(dev, "---> %s()\n", __func__);
+
+	/* exit PHY low power suspend */
+	devlc = readl(&dev->op_regs->devlc);
+	VDBG(dev, "devlc = 0x%08x\n", devlc);
+	devlc &= ~LPM_PHCD;
+	writel(devlc, &dev->op_regs->devlc);
+
+	/* set device D0 power state */
+	pci_set_power_state(pdev, PCI_D0);
+
+	/* restore PCI state */
+	pci_restore_state(pdev);
+
+	/* enable IRQ handler */
+	if (request_irq(pdev->irq, langwell_irq, IRQF_SHARED, driver_name, dev)
+			!= 0) {
+		ERROR(dev, "request interrupt %d failed\n", pdev->irq);
+		return -1;
+	}
+	dev->got_irq = 1;
+
+	/* reset and start controller to run state */
+	if (dev->stopped) {
+		/* reset device controller */
+		langwell_udc_reset(dev);
+
+		/* reset ep0 dQH and endptctrl */
+		ep0_reset(dev);
+
+		/* start device if gadget is loaded */
+		if (dev->driver)
+			langwell_udc_start(dev);
+	}
+
+	/* reset USB status */
+	dev->usb_state = USB_STATE_ATTACHED;
+	dev->ep0_state = WAIT_FOR_SETUP;
+	dev->ep0_dir = USB_DIR_OUT;
+
+	DBG(dev, "<--- %s()\n", __func__);
+	return 0;
+}
+
+
+/* pci driver shutdown */
+static void langwell_udc_shutdown(struct pci_dev *pdev)
+{
+	struct langwell_udc	*dev = the_controller;
+	u32			usbmode;
+
+	DBG(dev, "---> %s()\n", __func__);
+
+	/* reset controller mode to IDLE */
+	usbmode = readl(&dev->op_regs->usbmode);
+	DBG(dev, "usbmode = 0x%08x\n", usbmode);
+	usbmode &= (~3 | MODE_IDLE);
+	writel(usbmode, &dev->op_regs->usbmode);
+
+	DBG(dev, "<--- %s()\n", __func__);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct pci_device_id pci_ids[] = { {
+	.class =	((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+	.class_mask =	~0,
+	.vendor =	0x8086,
+	.device =	0x0811,
+	.subvendor =	PCI_ANY_ID,
+	.subdevice =	PCI_ANY_ID,
+}, { /* end: all zeroes */ }
+};
+
+
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+
+static struct pci_driver langwell_pci_driver = {
+	.name =		(char *) driver_name,
+	.id_table =	pci_ids,
+
+	.probe =	langwell_udc_probe,
+	.remove =	langwell_udc_remove,
+
+	/* device controller suspend/resume */
+	.suspend =	langwell_udc_suspend,
+	.resume =	langwell_udc_resume,
+
+	.shutdown =	langwell_udc_shutdown,
+};
+
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Xiaochen Shen <xiaochen.shen@intel.com>");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+
+
+static int __init init(void)
+{
+#ifdef	OTG_TRANSCEIVER
+	return langwell_register_peripheral(&langwell_pci_driver);
+#else
+	return pci_register_driver(&langwell_pci_driver);
+#endif
+}
+module_init(init);
+
+
+static void __exit cleanup(void)
+{
+#ifdef	OTG_TRANSCEIVER
+	return langwell_unregister_peripheral(&langwell_pci_driver);
+#else
+	pci_unregister_driver(&langwell_pci_driver);
+#endif
+}
+module_exit(cleanup);
+
diff --git a/drivers/usb/gadget/langwell_udc.h b/drivers/usb/gadget/langwell_udc.h
new file mode 100644
index 000000000000..9719934e1c08
--- /dev/null
+++ b/drivers/usb/gadget/langwell_udc.h
@@ -0,0 +1,228 @@
+/*
+ * Intel Langwell USB Device Controller driver
+ * Copyright (C) 2008-2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/usb/langwell_udc.h>
+
+#if defined(CONFIG_USB_LANGWELL_OTG)
+#include <linux/usb/langwell_otg.h>
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
+/* driver data structures and utilities */
+
+/*
+ * dTD: Device Endpoint Transfer Descriptor
+ * describe to the device controller the location and quantity of
+ * data to be send/received for given transfer
+ */
+struct langwell_dtd {
+	u32	dtd_next;
+/* bits 31:5, next transfer element pointer */
+#define	DTD_NEXT(d)	(((d)>>5)&0x7ffffff)
+#define	DTD_NEXT_MASK	(0x7ffffff << 5)
+/* terminate */
+#define	DTD_TERM	BIT(0)
+	/* bits 7:0, execution back states */
+	u32	dtd_status:8;
+#define	DTD_STATUS(d)	(((d)>>0)&0xff)
+#define	DTD_STS_ACTIVE	BIT(7)	/* active */
+#define	DTD_STS_HALTED	BIT(6)	/* halted */
+#define	DTD_STS_DBE	BIT(5)	/* data buffer error */
+#define	DTD_STS_TRE	BIT(3)	/* transaction error  */
+	/* bits 9:8 */
+	u32	dtd_res0:2;
+	/* bits 11:10, multipier override */
+	u32	dtd_multo:2;
+#define	DTD_MULTO	(BIT(11) | BIT(10))
+	/* bits 14:12 */
+	u32	dtd_res1:3;
+	/* bit 15, interrupt on complete */
+	u32	dtd_ioc:1;
+#define	DTD_IOC		BIT(15)
+	/* bits 30:16, total bytes */
+	u32	dtd_total:15;
+#define	DTD_TOTAL(d)	(((d)>>16)&0x7fff)
+#define	DTD_MAX_TRANSFER_LENGTH	0x4000
+	/* bit 31 */
+	u32	dtd_res2:1;
+	/* dTD buffer pointer page 0 to 4 */
+	u32	dtd_buf[5];
+#define	DTD_OFFSET_MASK	0xfff
+/* bits 31:12, buffer pointer */
+#define	DTD_BUFFER(d)	(((d)>>12)&0x3ff)
+/* bits 11:0, current offset */
+#define	DTD_C_OFFSET(d)	(((d)>>0)&0xfff)
+/* bits 10:0, frame number */
+#define	DTD_FRAME(d)	(((d)>>0)&0x7ff)
+
+	/* driver-private parts */
+
+	/* dtd dma address */
+	dma_addr_t		dtd_dma;
+	/* next dtd virtual address */
+	struct langwell_dtd	*next_dtd_virt;
+};
+
+
+/*
+ * dQH: Device Endpoint Queue Head
+ * describe where all transfers are managed
+ * 48-byte data structure, aligned on 64-byte boundary
+ *
+ * These are associated with dTD structure
+ */
+struct langwell_dqh {
+	/* endpoint capabilities and characteristics */
+	u32	dqh_res0:15;	/* bits 14:0 */
+	u32	dqh_ios:1;	/* bit 15, interrupt on setup */
+#define	DQH_IOS		BIT(15)
+	u32	dqh_mpl:11;	/* bits 26:16, maximum packet length */
+#define	DQH_MPL		(0x7ff << 16)
+	u32	dqh_res1:2;	/* bits 28:27 */
+	u32	dqh_zlt:1;	/* bit 29, zero length termination */
+#define	DQH_ZLT		BIT(29)
+	u32	dqh_mult:2;	/* bits 31:30 */
+#define	DQH_MULT	(BIT(30) | BIT(31))
+
+	/* current dTD pointer */
+	u32	dqh_current;	/* locate the transfer in progress */
+#define DQH_C_DTD(e)	\
+	(((e)>>5)&0x7ffffff)	/* bits 31:5, current dTD pointer */
+
+	/* transfer overlay, hardware parts of a struct langwell_dtd */
+	u32	dtd_next;
+	u32	dtd_status:8;	/* bits 7:0, execution back states */
+	u32	dtd_res0:2;	/* bits 9:8 */
+	u32	dtd_multo:2;	/* bits 11:10, multipier override */
+	u32	dtd_res1:3;	/* bits 14:12 */
+	u32	dtd_ioc:1;	/* bit 15, interrupt on complete */
+	u32	dtd_total:15;	/* bits 30:16, total bytes */
+	u32	dtd_res2:1;	/* bit 31 */
+	u32	dtd_buf[5];	/* dTD buffer pointer page 0 to 4 */
+
+	u32	dqh_res2;
+	struct usb_ctrlrequest	dqh_setup;	/* setup packet buffer */
+} __attribute__ ((aligned(64)));
+
+
+/* endpoint data structure */
+struct langwell_ep {
+	struct usb_ep		ep;
+	dma_addr_t		dma;
+	struct langwell_udc	*dev;
+	unsigned long		irqs;
+	struct list_head	queue;
+	struct langwell_dqh	*dqh;
+	const struct usb_endpoint_descriptor	*desc;
+	char			name[14];
+	unsigned		stopped:1,
+				ep_type:2,
+				ep_num:8;
+};
+
+
+/* request data structure */
+struct langwell_request {
+	struct usb_request	req;
+	struct langwell_dtd	*dtd, *head, *tail;
+	struct langwell_ep	*ep;
+	dma_addr_t		dtd_dma;
+	struct list_head	queue;
+	unsigned		dtd_count;
+	unsigned		mapped:1;
+};
+
+
+/* ep0 transfer state */
+enum ep0_state {
+	WAIT_FOR_SETUP,
+	DATA_STATE_XMIT,
+	DATA_STATE_NEED_ZLP,
+	WAIT_FOR_OUT_STATUS,
+	DATA_STATE_RECV,
+};
+
+
+/* device suspend state */
+enum lpm_state {
+	LPM_L0,	/* on */
+	LPM_L1,	/* LPM L1 sleep */
+	LPM_L2,	/* suspend */
+	LPM_L3,	/* off */
+};
+
+
+/* device data structure */
+struct langwell_udc {
+	/* each pci device provides one gadget, several endpoints */
+	struct usb_gadget	gadget;
+	spinlock_t		lock;	/* device lock */
+	struct langwell_ep	*ep;
+	struct usb_gadget_driver	*driver;
+	struct otg_transceiver	*transceiver;
+	u8			dev_addr;
+	u32			usb_state;
+	u32			resume_state;
+	u32			bus_reset;
+	enum lpm_state		lpm_state;
+	enum ep0_state		ep0_state;
+	u32			ep0_dir;
+	u16			dciversion;
+	unsigned		ep_max;
+	unsigned		devcap:1,
+				enabled:1,
+				region:1,
+				got_irq:1,
+				powered:1,
+				remote_wakeup:1,
+				rate:1,
+				is_reset:1,
+				softconnected:1,
+				vbus_active:1,
+				suspended:1,
+				stopped:1,
+				lpm:1;	/* LPM capability */
+
+	/* pci state used to access those endpoints */
+	struct pci_dev		*pdev;
+
+	/* Langwell otg transceiver */
+	struct langwell_otg	*lotg;
+
+	/* control registers */
+	struct langwell_cap_regs	__iomem	*cap_regs;
+	struct langwell_op_regs		__iomem	*op_regs;
+
+	struct usb_ctrlrequest	local_setup_buff;
+	struct langwell_dqh	*ep_dqh;
+	size_t			ep_dqh_size;
+	dma_addr_t		ep_dqh_dma;
+
+	/* ep0 status request */
+	struct langwell_request	*status_req;
+
+	/* dma pool */
+	struct dma_pool		*dtd_pool;
+
+	/* make sure release() is done */
+	struct completion	*done;
+};
+
diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index 8cc676ecbb23..1937d8c7b433 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -38,7 +38,6 @@
 #include <linux/usb.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
-#include <mach/pxa2xx-regs.h> /* FIXME: for PSSR */
 #include <mach/udc.h>
 
 #include "pxa27x_udc.h"
@@ -474,6 +473,23 @@ static inline void udc_clear_mask_UDCCR(struct pxa_udc *udc, int mask)
 }
 
 /**
+ * ep_write_UDCCSR - set bits in UDCCSR
+ * @udc: udc device
+ * @mask: bits to set in UDCCR
+ *
+ * Sets bits in UDCCSR (UDCCSR0 and UDCCSR*).
+ *
+ * A specific case is applied to ep0 : the ACM bit is always set to 1, for
+ * SET_INTERFACE and SET_CONFIGURATION.
+ */
+static inline void ep_write_UDCCSR(struct pxa_ep *ep, int mask)
+{
+	if (is_ep0(ep))
+		mask |= UDCCSR0_ACM;
+	udc_ep_writel(ep, UDCCSR, mask);
+}
+
+/**
  * ep_count_bytes_remain - get how many bytes in udc endpoint
  * @ep: udc endpoint
  *
@@ -861,7 +877,7 @@ static int read_packet(struct pxa_ep *ep, struct pxa27x_request *req)
 		*buf++ = udc_ep_readl(ep, UDCDR);
 	req->req.actual += count;
 
-	udc_ep_writel(ep, UDCCSR, UDCCSR_PC);
+	ep_write_UDCCSR(ep, UDCCSR_PC);
 
 	return count;
 }
@@ -969,12 +985,12 @@ static int write_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
 		if (udccsr & UDCCSR_PC) {
 			ep_vdbg(ep, "Clearing Transmit Complete, udccsr=%x\n",
 				udccsr);
-			udc_ep_writel(ep, UDCCSR, UDCCSR_PC);
+			ep_write_UDCCSR(ep, UDCCSR_PC);
 		}
 		if (udccsr & UDCCSR_TRN) {
 			ep_vdbg(ep, "Clearing Underrun on, udccsr=%x\n",
 				udccsr);
-			udc_ep_writel(ep, UDCCSR, UDCCSR_TRN);
+			ep_write_UDCCSR(ep, UDCCSR_TRN);
 		}
 
 		count = write_packet(ep, req, max);
@@ -996,7 +1012,7 @@ static int write_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
 		}
 
 		if (is_short)
-			udc_ep_writel(ep, UDCCSR, UDCCSR_SP);
+			ep_write_UDCCSR(ep, UDCCSR_SP);
 
 		/* requests complete when all IN data is in the FIFO */
 		if (is_last) {
@@ -1029,7 +1045,7 @@ static int read_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
 
 	while (epout_has_pkt(ep)) {
 		count = read_packet(ep, req);
-		udc_ep_writel(ep, UDCCSR, UDCCSR0_OPC);
+		ep_write_UDCCSR(ep, UDCCSR0_OPC);
 		inc_ep_stats_bytes(ep, count, !USB_DIR_IN);
 
 		is_short = (count < ep->fifo_size);
@@ -1074,7 +1090,7 @@ static int write_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
 
 	/* Sends either a short packet or a 0 length packet */
 	if (unlikely(is_short))
-		udc_ep_writel(ep, UDCCSR, UDCCSR0_IPR);
+		ep_write_UDCCSR(ep, UDCCSR0_IPR);
 
 	ep_dbg(ep, "in %d bytes%s%s, %d left, req=%p, udccsr0=0x%03x\n",
 		count, is_short ? "/S" : "", is_last ? "/L" : "",
@@ -1277,7 +1293,7 @@ static int pxa_ep_set_halt(struct usb_ep *_ep, int value)
 
 	/* FST, FEF bits are the same for control and non control endpoints */
 	rc = 0;
-	udc_ep_writel(ep, UDCCSR, UDCCSR_FST | UDCCSR_FEF);
+	ep_write_UDCCSR(ep, UDCCSR_FST | UDCCSR_FEF);
 	if (is_ep0(ep))
 		set_ep0state(ep->dev, STALL);
 
@@ -1343,7 +1359,7 @@ static void pxa_ep_fifo_flush(struct usb_ep *_ep)
 			udc_ep_readl(ep, UDCDR);
 	} else {
 		/* most IN status is the same, but ISO can't stall */
-		udc_ep_writel(ep, UDCCSR,
+		ep_write_UDCCSR(ep,
 				UDCCSR_PC | UDCCSR_FEF | UDCCSR_TRN
 				| (EPXFERTYPE_is_ISO(ep) ? 0 : UDCCSR_SST));
 	}
@@ -1728,6 +1744,7 @@ static void udc_enable(struct pxa_udc *udc)
 	memset(&udc->stats, 0, sizeof(udc->stats));
 
 	udc_set_mask_UDCCR(udc, UDCCR_UDE);
+	ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_ACM);
 	udelay(2);
 	if (udc_readl(udc, UDCCR) & UDCCR_EMCE)
 		dev_err(udc->dev, "Configuration errors, udc disabled\n");
@@ -1893,6 +1910,15 @@ static void handle_ep0_ctrl_req(struct pxa_udc *udc,
 
 	nuke(ep, -EPROTO);
 
+	/*
+	 * In the PXA320 manual, in the section about Back-to-Back setup
+	 * packets, it describes this situation.  The solution is to set OPC to
+	 * get rid of the status packet, and then continue with the setup
+	 * packet. Generalize to pxa27x CPUs.
+	 */
+	if (epout_has_pkt(ep) && (ep_count_bytes_remain(ep) == 0))
+		ep_write_UDCCSR(ep, UDCCSR0_OPC);
+
 	/* read SETUP packet */
 	for (i = 0; i < 2; i++) {
 		if (unlikely(ep_is_empty(ep)))
@@ -1919,7 +1945,7 @@ static void handle_ep0_ctrl_req(struct pxa_udc *udc,
 		set_ep0state(udc, OUT_DATA_STAGE);
 
 	/* Tell UDC to enter Data Stage */
-	udc_ep_writel(ep, UDCCSR, UDCCSR0_SA | UDCCSR0_OPC);
+	ep_write_UDCCSR(ep, UDCCSR0_SA | UDCCSR0_OPC);
 
 	i = udc->driver->setup(&udc->gadget, &u.r);
 	if (i < 0)
@@ -1929,7 +1955,7 @@ out:
 stall:
 	ep_dbg(ep, "protocol STALL, udccsr0=%03x err %d\n",
 		udc_ep_readl(ep, UDCCSR), i);
-	udc_ep_writel(ep, UDCCSR, UDCCSR0_FST | UDCCSR0_FTF);
+	ep_write_UDCCSR(ep, UDCCSR0_FST | UDCCSR0_FTF);
 	set_ep0state(udc, STALL);
 	goto out;
 }
@@ -1966,6 +1992,8 @@ stall:
  *     cleared by software.
  *   - clearing UDCCSR0_OPC always flushes ep0. If in setup stage, never do it
  *     before reading ep0.
+ *     This is true only for PXA27x. This is not true anymore for PXA3xx family
+ *     (check Back-to-Back setup packet in developers guide).
  *   - irq can be called on a "packet complete" event (opc_irq=1), while
  *     UDCCSR0_OPC is not yet raised (delta can be as big as 100ms
  *     from experimentation).
@@ -1998,7 +2026,7 @@ static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
 	if (udccsr0 & UDCCSR0_SST) {
 		ep_dbg(ep, "clearing stall status\n");
 		nuke(ep, -EPIPE);
-		udc_ep_writel(ep, UDCCSR, UDCCSR0_SST);
+		ep_write_UDCCSR(ep, UDCCSR0_SST);
 		ep0_idle(udc);
 	}
 
@@ -2023,7 +2051,7 @@ static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
 		break;
 	case IN_DATA_STAGE:			/* GET_DESCRIPTOR */
 		if (epout_has_pkt(ep))
-			udc_ep_writel(ep, UDCCSR, UDCCSR0_OPC);
+			ep_write_UDCCSR(ep, UDCCSR0_OPC);
 		if (req && !ep_is_full(ep))
 			completed = write_ep0_fifo(ep, req);
 		if (completed)
@@ -2036,7 +2064,7 @@ static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
 			ep0_end_out_req(ep, req);
 		break;
 	case STALL:
-		udc_ep_writel(ep, UDCCSR, UDCCSR0_FST);
+		ep_write_UDCCSR(ep, UDCCSR0_FST);
 		break;
 	case IN_STATUS_STAGE:
 		/*
@@ -2131,6 +2159,7 @@ static void pxa27x_change_configuration(struct pxa_udc *udc, int config)
 
 	set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
 	udc->driver->setup(&udc->gadget, &req);
+	ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
 }
 
 /**
@@ -2159,6 +2188,7 @@ static void pxa27x_change_interface(struct pxa_udc *udc, int iface, int alt)
 
 	set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
 	udc->driver->setup(&udc->gadget, &req);
+	ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
 }
 
 /*
@@ -2280,7 +2310,7 @@ static void irq_udc_reset(struct pxa_udc *udc)
 	memset(&udc->stats, 0, sizeof udc->stats);
 
 	nuke(ep, -EPROTO);
-	udc_ep_writel(ep, UDCCSR, UDCCSR0_FTF | UDCCSR0_OPC);
+	ep_write_UDCCSR(ep, UDCCSR0_FTF | UDCCSR0_OPC);
 	ep0_idle(udc);
 }
 
@@ -2479,6 +2509,12 @@ static void pxa_udc_shutdown(struct platform_device *_dev)
 		udc_disable(udc);
 }
 
+#ifdef CONFIG_CPU_PXA27x
+extern void pxa27x_clear_otgph(void);
+#else
+#define pxa27x_clear_otgph()   do {} while (0)
+#endif
+
 #ifdef CONFIG_PM
 /**
  * pxa_udc_suspend - Suspend udc device
@@ -2546,8 +2582,7 @@ static int pxa_udc_resume(struct platform_device *_dev)
 	 * Software must configure the USB OTG pad, UDC, and UHC
 	 * to the state they were in before entering sleep mode.
 	 */
-	if (cpu_is_pxa27x())
-		PSSR |= PSSR_OTGPH;
+	pxa27x_clear_otgph();
 
 	return 0;
 }
@@ -2571,7 +2606,7 @@ static struct platform_driver udc_driver = {
 
 static int __init udc_init(void)
 {
-	if (!cpu_is_pxa27x())
+	if (!cpu_is_pxa27x() && !cpu_is_pxa3xx())
 		return -ENODEV;
 
 	printk(KERN_INFO "%s: version %s\n", driver_name, DRIVER_VERSION);
diff --git a/drivers/usb/gadget/pxa27x_udc.h b/drivers/usb/gadget/pxa27x_udc.h
index db58125331da..e25225e26586 100644
--- a/drivers/usb/gadget/pxa27x_udc.h
+++ b/drivers/usb/gadget/pxa27x_udc.h
@@ -130,6 +130,8 @@
 #define UP2OCR_HXOE	(1 << 17)	/* Transceiver Output Enable */
 #define UP2OCR_SEOS	(1 << 24)	/* Single-Ended Output Select */
 
+#define UDCCSR0_ACM	(1 << 9)	/* Ack Control Mode */
+#define UDCCSR0_AREN	(1 << 8)	/* Ack Response Enable */
 #define UDCCSR0_SA	(1 << 7)	/* Setup Active */
 #define UDCCSR0_RNE	(1 << 6)	/* Receive FIFO Not Empty */
 #define UDCCSR0_FST	(1 << 5)	/* Force Stall */
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
new file mode 100644
index 000000000000..50c71aae2cc2
--- /dev/null
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -0,0 +1,3269 @@
+/* linux/drivers/usb/gadget/s3c-hsotg.c
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S3C USB2.0 High-speed / OtG driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include <mach/map.h>
+
+#include <plat/regs-usb-hsotg-phy.h>
+#include <plat/regs-usb-hsotg.h>
+#include <plat/regs-sys.h>
+#include <plat/udc-hs.h>
+
+#define DMA_ADDR_INVALID (~((dma_addr_t)0))
+
+/* EP0_MPS_LIMIT
+ *
+ * Unfortunately there seems to be a limit of the amount of data that can
+ * be transfered by IN transactions on EP0. This is either 127 bytes or 3
+ * packets (which practially means 1 packet and 63 bytes of data) when the
+ * MPS is set to 64.
+ *
+ * This means if we are wanting to move >127 bytes of data, we need to
+ * split the transactions up, but just doing one packet at a time does
+ * not work (this may be an implicit DATA0 PID on first packet of the
+ * transaction) and doing 2 packets is outside the controller's limits.
+ *
+ * If we try to lower the MPS size for EP0, then no transfers work properly
+ * for EP0, and the system will fail basic enumeration. As no cause for this
+ * has currently been found, we cannot support any large IN transfers for
+ * EP0.
+ */
+#define EP0_MPS_LIMIT	64
+
+struct s3c_hsotg;
+struct s3c_hsotg_req;
+
+/**
+ * struct s3c_hsotg_ep - driver endpoint definition.
+ * @ep: The gadget layer representation of the endpoint.
+ * @name: The driver generated name for the endpoint.
+ * @queue: Queue of requests for this endpoint.
+ * @parent: Reference back to the parent device structure.
+ * @req: The current request that the endpoint is processing. This is
+ *       used to indicate an request has been loaded onto the endpoint
+ *       and has yet to be completed (maybe due to data move, or simply
+ *	 awaiting an ack from the core all the data has been completed).
+ * @debugfs: File entry for debugfs file for this endpoint.
+ * @lock: State lock to protect contents of endpoint.
+ * @dir_in: Set to true if this endpoint is of the IN direction, which
+ *	    means that it is sending data to the Host.
+ * @index: The index for the endpoint registers.
+ * @name: The name array passed to the USB core.
+ * @halted: Set if the endpoint has been halted.
+ * @periodic: Set if this is a periodic ep, such as Interrupt
+ * @sent_zlp: Set if we've sent a zero-length packet.
+ * @total_data: The total number of data bytes done.
+ * @fifo_size: The size of the FIFO (for periodic IN endpoints)
+ * @fifo_load: The amount of data loaded into the FIFO (periodic IN)
+ * @last_load: The offset of data for the last start of request.
+ * @size_loaded: The last loaded size for DxEPTSIZE for periodic IN
+ *
+ * This is the driver's state for each registered enpoint, allowing it
+ * to keep track of transactions that need doing. Each endpoint has a
+ * lock to protect the state, to try and avoid using an overall lock
+ * for the host controller as much as possible.
+ *
+ * For periodic IN endpoints, we have fifo_size and fifo_load to try
+ * and keep track of the amount of data in the periodic FIFO for each
+ * of these as we don't have a status register that tells us how much
+ * is in each of them.
+ */
+struct s3c_hsotg_ep {
+	struct usb_ep		ep;
+	struct list_head	queue;
+	struct s3c_hsotg	*parent;
+	struct s3c_hsotg_req	*req;
+	struct dentry		*debugfs;
+
+	spinlock_t		lock;
+
+	unsigned long		total_data;
+	unsigned int		size_loaded;
+	unsigned int		last_load;
+	unsigned int		fifo_load;
+	unsigned short		fifo_size;
+
+	unsigned char		dir_in;
+	unsigned char		index;
+
+	unsigned int		halted:1;
+	unsigned int		periodic:1;
+	unsigned int		sent_zlp:1;
+
+	char			name[10];
+};
+
+#define S3C_HSOTG_EPS	(8+1)	/* limit to 9 for the moment */
+
+/**
+ * struct s3c_hsotg - driver state.
+ * @dev: The parent device supplied to the probe function
+ * @driver: USB gadget driver
+ * @plat: The platform specific configuration data.
+ * @regs: The memory area mapped for accessing registers.
+ * @regs_res: The resource that was allocated when claiming register space.
+ * @irq: The IRQ number we are using
+ * @debug_root: root directrory for debugfs.
+ * @debug_file: main status file for debugfs.
+ * @debug_fifo: FIFO status file for debugfs.
+ * @ep0_reply: Request used for ep0 reply.
+ * @ep0_buff: Buffer for EP0 reply data, if needed.
+ * @ctrl_buff: Buffer for EP0 control requests.
+ * @ctrl_req: Request for EP0 control packets.
+ * @eps: The endpoints being supplied to the gadget framework
+ */
+struct s3c_hsotg {
+	struct device		 *dev;
+	struct usb_gadget_driver *driver;
+	struct s3c_hsotg_plat	 *plat;
+
+	void __iomem		*regs;
+	struct resource		*regs_res;
+	int			irq;
+
+	struct dentry		*debug_root;
+	struct dentry		*debug_file;
+	struct dentry		*debug_fifo;
+
+	struct usb_request	*ep0_reply;
+	struct usb_request	*ctrl_req;
+	u8			ep0_buff[8];
+	u8			ctrl_buff[8];
+
+	struct usb_gadget	gadget;
+	struct s3c_hsotg_ep	eps[];
+};
+
+/**
+ * struct s3c_hsotg_req - data transfer request
+ * @req: The USB gadget request
+ * @queue: The list of requests for the endpoint this is queued for.
+ * @in_progress: Has already had size/packets written to core
+ * @mapped: DMA buffer for this request has been mapped via dma_map_single().
+ */
+struct s3c_hsotg_req {
+	struct usb_request	req;
+	struct list_head	queue;
+	unsigned char		in_progress;
+	unsigned char		mapped;
+};
+
+/* conversion functions */
+static inline struct s3c_hsotg_req *our_req(struct usb_request *req)
+{
+	return container_of(req, struct s3c_hsotg_req, req);
+}
+
+static inline struct s3c_hsotg_ep *our_ep(struct usb_ep *ep)
+{
+	return container_of(ep, struct s3c_hsotg_ep, ep);
+}
+
+static inline struct s3c_hsotg *to_hsotg(struct usb_gadget *gadget)
+{
+	return container_of(gadget, struct s3c_hsotg, gadget);
+}
+
+static inline void __orr32(void __iomem *ptr, u32 val)
+{
+	writel(readl(ptr) | val, ptr);
+}
+
+static inline void __bic32(void __iomem *ptr, u32 val)
+{
+	writel(readl(ptr) & ~val, ptr);
+}
+
+/* forward decleration of functions */
+static void s3c_hsotg_dump(struct s3c_hsotg *hsotg);
+
+/**
+ * using_dma - return the DMA status of the driver.
+ * @hsotg: The driver state.
+ *
+ * Return true if we're using DMA.
+ *
+ * Currently, we have the DMA support code worked into everywhere
+ * that needs it, but the AMBA DMA implementation in the hardware can
+ * only DMA from 32bit aligned addresses. This means that gadgets such
+ * as the CDC Ethernet cannot work as they often pass packets which are
+ * not 32bit aligned.
+ *
+ * Unfortunately the choice to use DMA or not is global to the controller
+ * and seems to be only settable when the controller is being put through
+ * a core reset. This means we either need to fix the gadgets to take
+ * account of DMA alignment, or add bounce buffers (yuerk).
+ *
+ * Until this issue is sorted out, we always return 'false'.
+ */
+static inline bool using_dma(struct s3c_hsotg *hsotg)
+{
+	return false;	/* support is not complete */
+}
+
+/**
+ * s3c_hsotg_en_gsint - enable one or more of the general interrupt
+ * @hsotg: The device state
+ * @ints: A bitmask of the interrupts to enable
+ */
+static void s3c_hsotg_en_gsint(struct s3c_hsotg *hsotg, u32 ints)
+{
+	u32 gsintmsk = readl(hsotg->regs + S3C_GINTMSK);
+	u32 new_gsintmsk;
+
+	new_gsintmsk = gsintmsk | ints;
+
+	if (new_gsintmsk != gsintmsk) {
+		dev_dbg(hsotg->dev, "gsintmsk now 0x%08x\n", new_gsintmsk);
+		writel(new_gsintmsk, hsotg->regs + S3C_GINTMSK);
+	}
+}
+
+/**
+ * s3c_hsotg_disable_gsint - disable one or more of the general interrupt
+ * @hsotg: The device state
+ * @ints: A bitmask of the interrupts to enable
+ */
+static void s3c_hsotg_disable_gsint(struct s3c_hsotg *hsotg, u32 ints)
+{
+	u32 gsintmsk = readl(hsotg->regs + S3C_GINTMSK);
+	u32 new_gsintmsk;
+
+	new_gsintmsk = gsintmsk & ~ints;
+
+	if (new_gsintmsk != gsintmsk)
+		writel(new_gsintmsk, hsotg->regs + S3C_GINTMSK);
+}
+
+/**
+ * s3c_hsotg_ctrl_epint - enable/disable an endpoint irq
+ * @hsotg: The device state
+ * @ep: The endpoint index
+ * @dir_in: True if direction is in.
+ * @en: The enable value, true to enable
+ *
+ * Set or clear the mask for an individual endpoint's interrupt
+ * request.
+ */
+static void s3c_hsotg_ctrl_epint(struct s3c_hsotg *hsotg,
+				 unsigned int ep, unsigned int dir_in,
+				 unsigned int en)
+{
+	unsigned long flags;
+	u32 bit = 1 << ep;
+	u32 daint;
+
+	if (!dir_in)
+		bit <<= 16;
+
+	local_irq_save(flags);
+	daint = readl(hsotg->regs + S3C_DAINTMSK);
+	if (en)
+		daint |= bit;
+	else
+		daint &= ~bit;
+	writel(daint, hsotg->regs + S3C_DAINTMSK);
+	local_irq_restore(flags);
+}
+
+/**
+ * s3c_hsotg_init_fifo - initialise non-periodic FIFOs
+ * @hsotg: The device instance.
+ */
+static void s3c_hsotg_init_fifo(struct s3c_hsotg *hsotg)
+{
+	/* the ryu 2.6.24 release ahs
+	   writel(0x1C0, hsotg->regs + S3C_GRXFSIZ);
+	   writel(S3C_GNPTXFSIZ_NPTxFStAddr(0x200) |
+		S3C_GNPTXFSIZ_NPTxFDep(0x1C0),
+		hsotg->regs + S3C_GNPTXFSIZ);
+	*/
+
+	/* set FIFO sizes to 2048/0x1C0 */
+
+	writel(2048, hsotg->regs + S3C_GRXFSIZ);
+	writel(S3C_GNPTXFSIZ_NPTxFStAddr(2048) |
+	       S3C_GNPTXFSIZ_NPTxFDep(0x1C0),
+	       hsotg->regs + S3C_GNPTXFSIZ);
+}
+
+/**
+ * @ep: USB endpoint to allocate request for.
+ * @flags: Allocation flags
+ *
+ * Allocate a new USB request structure appropriate for the specified endpoint
+ */
+struct usb_request *s3c_hsotg_ep_alloc_request(struct usb_ep *ep, gfp_t flags)
+{
+	struct s3c_hsotg_req *req;
+
+	req = kzalloc(sizeof(struct s3c_hsotg_req), flags);
+	if (!req)
+		return NULL;
+
+	INIT_LIST_HEAD(&req->queue);
+
+	req->req.dma = DMA_ADDR_INVALID;
+	return &req->req;
+}
+
+/**
+ * is_ep_periodic - return true if the endpoint is in periodic mode.
+ * @hs_ep: The endpoint to query.
+ *
+ * Returns true if the endpoint is in periodic mode, meaning it is being
+ * used for an Interrupt or ISO transfer.
+ */
+static inline int is_ep_periodic(struct s3c_hsotg_ep *hs_ep)
+{
+	return hs_ep->periodic;
+}
+
+/**
+ * s3c_hsotg_unmap_dma - unmap the DMA memory being used for the request
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint for the request
+ * @hs_req: The request being processed.
+ *
+ * This is the reverse of s3c_hsotg_map_dma(), called for the completion
+ * of a request to ensure the buffer is ready for access by the caller.
+*/
+static void s3c_hsotg_unmap_dma(struct s3c_hsotg *hsotg,
+				struct s3c_hsotg_ep *hs_ep,
+				struct s3c_hsotg_req *hs_req)
+{
+	struct usb_request *req = &hs_req->req;
+	enum dma_data_direction dir;
+
+	dir = hs_ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+	/* ignore this if we're not moving any data */
+	if (hs_req->req.length == 0)
+		return;
+
+	if (hs_req->mapped) {
+		/* we mapped this, so unmap and remove the dma */
+
+		dma_unmap_single(hsotg->dev, req->dma, req->length, dir);
+
+		req->dma = DMA_ADDR_INVALID;
+		hs_req->mapped = 0;
+	} else {
+		dma_sync_single(hsotg->dev, req->dma, req->length, dir);
+	}
+}
+
+/**
+ * s3c_hsotg_write_fifo - write packet Data to the TxFIFO
+ * @hsotg: The controller state.
+ * @hs_ep: The endpoint we're going to write for.
+ * @hs_req: The request to write data for.
+ *
+ * This is called when the TxFIFO has some space in it to hold a new
+ * transmission and we have something to give it. The actual setup of
+ * the data size is done elsewhere, so all we have to do is to actually
+ * write the data.
+ *
+ * The return value is zero if there is more space (or nothing was done)
+ * otherwise -ENOSPC is returned if the FIFO space was used up.
+ *
+ * This routine is only needed for PIO
+*/
+static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
+				struct s3c_hsotg_ep *hs_ep,
+				struct s3c_hsotg_req *hs_req)
+{
+	bool periodic = is_ep_periodic(hs_ep);
+	u32 gnptxsts = readl(hsotg->regs + S3C_GNPTXSTS);
+	int buf_pos = hs_req->req.actual;
+	int to_write = hs_ep->size_loaded;
+	void *data;
+	int can_write;
+	int pkt_round;
+
+	to_write -= (buf_pos - hs_ep->last_load);
+
+	/* if there's nothing to write, get out early */
+	if (to_write == 0)
+		return 0;
+
+	if (periodic) {
+		u32 epsize = readl(hsotg->regs + S3C_DIEPTSIZ(hs_ep->index));
+		int size_left;
+		int size_done;
+
+		/* work out how much data was loaded so we can calculate
+		 * how much data is left in the fifo. */
+
+		size_left = S3C_DxEPTSIZ_XferSize_GET(epsize);
+
+		dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n",
+			__func__, size_left,
+			hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size);
+
+		/* how much of the data has moved */
+		size_done = hs_ep->size_loaded - size_left;
+
+		/* how much data is left in the fifo */
+		can_write = hs_ep->fifo_load - size_done;
+		dev_dbg(hsotg->dev, "%s: => can_write1=%d\n",
+			__func__, can_write);
+
+		can_write = hs_ep->fifo_size - can_write;
+		dev_dbg(hsotg->dev, "%s: => can_write2=%d\n",
+			__func__, can_write);
+
+		if (can_write <= 0) {
+			s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_PTxFEmp);
+			return -ENOSPC;
+		}
+	} else {
+		if (S3C_GNPTXSTS_NPTxQSpcAvail_GET(gnptxsts) == 0) {
+			dev_dbg(hsotg->dev,
+				"%s: no queue slots available (0x%08x)\n",
+				__func__, gnptxsts);
+
+			s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_NPTxFEmp);
+			return -ENOSPC;
+		}
+
+		can_write = S3C_GNPTXSTS_NPTxFSpcAvail_GET(gnptxsts);
+	}
+
+	dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, mps %d\n",
+		 __func__, gnptxsts, can_write, to_write, hs_ep->ep.maxpacket);
+
+	/* limit to 512 bytes of data, it seems at least on the non-periodic
+	 * FIFO, requests of >512 cause the endpoint to get stuck with a
+	 * fragment of the end of the transfer in it.
+	 */
+	if (can_write > 512)
+		can_write = 512;
+
+	/* see if we can write data */
+
+	if (to_write > can_write) {
+		to_write = can_write;
+		pkt_round = to_write % hs_ep->ep.maxpacket;
+
+		/* Not sure, but we probably shouldn't be writing partial
+		 * packets into the FIFO, so round the write down to an
+		 * exact number of packets.
+		 *
+		 * Note, we do not currently check to see if we can ever
+		 * write a full packet or not to the FIFO.
+		 */
+
+		if (pkt_round)
+			to_write -= pkt_round;
+
+		/* enable correct FIFO interrupt to alert us when there
+		 * is more room left. */
+
+		s3c_hsotg_en_gsint(hsotg,
+				   periodic ? S3C_GINTSTS_PTxFEmp :
+				   S3C_GINTSTS_NPTxFEmp);
+	}
+
+	dev_dbg(hsotg->dev, "write %d/%d, can_write %d, done %d\n",
+		 to_write, hs_req->req.length, can_write, buf_pos);
+
+	if (to_write <= 0)
+		return -ENOSPC;
+
+	hs_req->req.actual = buf_pos + to_write;
+	hs_ep->total_data += to_write;
+
+	if (periodic)
+		hs_ep->fifo_load += to_write;
+
+	to_write = DIV_ROUND_UP(to_write, 4);
+	data = hs_req->req.buf + buf_pos;
+
+	writesl(hsotg->regs + S3C_EPFIFO(hs_ep->index), data, to_write);
+
+	return (to_write >= can_write) ? -ENOSPC : 0;
+}
+
+/**
+ * get_ep_limit - get the maximum data legnth for this endpoint
+ * @hs_ep: The endpoint
+ *
+ * Return the maximum data that can be queued in one go on a given endpoint
+ * so that transfers that are too long can be split.
+ */
+static unsigned get_ep_limit(struct s3c_hsotg_ep *hs_ep)
+{
+	int index = hs_ep->index;
+	unsigned maxsize;
+	unsigned maxpkt;
+
+	if (index != 0) {
+		maxsize = S3C_DxEPTSIZ_XferSize_LIMIT + 1;
+		maxpkt = S3C_DxEPTSIZ_PktCnt_LIMIT + 1;
+	} else {
+		if (hs_ep->dir_in) {
+			/* maxsize = S3C_DIEPTSIZ0_XferSize_LIMIT + 1; */
+			maxsize = 64+64+1;
+			maxpkt = S3C_DIEPTSIZ0_PktCnt_LIMIT + 1;
+		} else {
+			maxsize = 0x3f;
+			maxpkt = 2;
+		}
+	}
+
+	/* we made the constant loading easier above by using +1 */
+	maxpkt--;
+	maxsize--;
+
+	/* constrain by packet count if maxpkts*pktsize is greater
+	 * than the length register size. */
+
+	if ((maxpkt * hs_ep->ep.maxpacket) < maxsize)
+		maxsize = maxpkt * hs_ep->ep.maxpacket;
+
+	return maxsize;
+}
+
+/**
+ * s3c_hsotg_start_req - start a USB request from an endpoint's queue
+ * @hsotg: The controller state.
+ * @hs_ep: The endpoint to process a request for
+ * @hs_req: The request to start.
+ * @continuing: True if we are doing more for the current request.
+ *
+ * Start the given request running by setting the endpoint registers
+ * appropriately, and writing any data to the FIFOs.
+ */
+static void s3c_hsotg_start_req(struct s3c_hsotg *hsotg,
+				struct s3c_hsotg_ep *hs_ep,
+				struct s3c_hsotg_req *hs_req,
+				bool continuing)
+{
+	struct usb_request *ureq = &hs_req->req;
+	int index = hs_ep->index;
+	int dir_in = hs_ep->dir_in;
+	u32 epctrl_reg;
+	u32 epsize_reg;
+	u32 epsize;
+	u32 ctrl;
+	unsigned length;
+	unsigned packets;
+	unsigned maxreq;
+
+	if (index != 0) {
+		if (hs_ep->req && !continuing) {
+			dev_err(hsotg->dev, "%s: active request\n", __func__);
+			WARN_ON(1);
+			return;
+		} else if (hs_ep->req != hs_req && continuing) {
+			dev_err(hsotg->dev,
+				"%s: continue different req\n", __func__);
+			WARN_ON(1);
+			return;
+		}
+	}
+
+	epctrl_reg = dir_in ? S3C_DIEPCTL(index) : S3C_DOEPCTL(index);
+	epsize_reg = dir_in ? S3C_DIEPTSIZ(index) : S3C_DOEPTSIZ(index);
+
+	dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x, ep %d, dir %s\n",
+		__func__, readl(hsotg->regs + epctrl_reg), index,
+		hs_ep->dir_in ? "in" : "out");
+
+	length = ureq->length - ureq->actual;
+
+	if (0)
+		dev_dbg(hsotg->dev,
+			"REQ buf %p len %d dma 0x%08x noi=%d zp=%d snok=%d\n",
+			ureq->buf, length, ureq->dma,
+			ureq->no_interrupt, ureq->zero, ureq->short_not_ok);
+
+	maxreq = get_ep_limit(hs_ep);
+	if (length > maxreq) {
+		int round = maxreq % hs_ep->ep.maxpacket;
+
+		dev_dbg(hsotg->dev, "%s: length %d, max-req %d, r %d\n",
+			__func__, length, maxreq, round);
+
+		/* round down to multiple of packets */
+		if (round)
+			maxreq -= round;
+
+		length = maxreq;
+	}
+
+	if (length)
+		packets = DIV_ROUND_UP(length, hs_ep->ep.maxpacket);
+	else
+		packets = 1;	/* send one packet if length is zero. */
+
+	if (dir_in && index != 0)
+		epsize = S3C_DxEPTSIZ_MC(1);
+	else
+		epsize = 0;
+
+	if (index != 0 && ureq->zero) {
+		/* test for the packets being exactly right for the
+		 * transfer */
+
+		if (length == (packets * hs_ep->ep.maxpacket))
+			packets++;
+	}
+
+	epsize |= S3C_DxEPTSIZ_PktCnt(packets);
+	epsize |= S3C_DxEPTSIZ_XferSize(length);
+
+	dev_dbg(hsotg->dev, "%s: %d@%d/%d, 0x%08x => 0x%08x\n",
+		__func__, packets, length, ureq->length, epsize, epsize_reg);
+
+	/* store the request as the current one we're doing */
+	hs_ep->req = hs_req;
+
+	/* write size / packets */
+	writel(epsize, hsotg->regs + epsize_reg);
+
+	ctrl = readl(hsotg->regs + epctrl_reg);
+
+	if (ctrl & S3C_DxEPCTL_Stall) {
+		dev_warn(hsotg->dev, "%s: ep%d is stalled\n", __func__, index);
+
+		/* not sure what we can do here, if it is EP0 then we should
+		 * get this cleared once the endpoint has transmitted the
+		 * STALL packet, otherwise it needs to be cleared by the
+		 * host.
+		 */
+	}
+
+	if (using_dma(hsotg)) {
+		unsigned int dma_reg;
+
+		/* write DMA address to control register, buffer already
+		 * synced by s3c_hsotg_ep_queue().  */
+
+		dma_reg = dir_in ? S3C_DIEPDMA(index) : S3C_DOEPDMA(index);
+		writel(ureq->dma, hsotg->regs + dma_reg);
+
+		dev_dbg(hsotg->dev, "%s: 0x%08x => 0x%08x\n",
+			__func__, ureq->dma, dma_reg);
+	}
+
+	ctrl |= S3C_DxEPCTL_EPEna;	/* ensure ep enabled */
+	ctrl |= S3C_DxEPCTL_USBActEp;
+	ctrl |= S3C_DxEPCTL_CNAK;	/* clear NAK set by core */
+
+	dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
+	writel(ctrl, hsotg->regs + epctrl_reg);
+
+	/* set these, it seems that DMA support increments past the end
+	 * of the packet buffer so we need to calculate the length from
+	 * this information. */
+	hs_ep->size_loaded = length;
+	hs_ep->last_load = ureq->actual;
+
+	if (dir_in && !using_dma(hsotg)) {
+		/* set these anyway, we may need them for non-periodic in */
+		hs_ep->fifo_load = 0;
+
+		s3c_hsotg_write_fifo(hsotg, hs_ep, hs_req);
+	}
+
+	/* clear the INTknTXFEmpMsk when we start request, more as a aide
+	 * to debugging to see what is going on. */
+	if (dir_in)
+		writel(S3C_DIEPMSK_INTknTXFEmpMsk,
+		       hsotg->regs + S3C_DIEPINT(index));
+
+	/* Note, trying to clear the NAK here causes problems with transmit
+	 * on the S3C6400 ending up with the TXFIFO becomming full. */
+
+	/* check ep is enabled */
+	if (!(readl(hsotg->regs + epctrl_reg) & S3C_DxEPCTL_EPEna))
+		dev_warn(hsotg->dev,
+			 "ep%d: failed to become enabled (DxEPCTL=0x%08x)?\n",
+			 index, readl(hsotg->regs + epctrl_reg));
+
+	dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n",
+		__func__, readl(hsotg->regs + epctrl_reg));
+}
+
+/**
+ * s3c_hsotg_map_dma - map the DMA memory being used for the request
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint the request is on.
+ * @req: The request being processed.
+ *
+ * We've been asked to queue a request, so ensure that the memory buffer
+ * is correctly setup for DMA. If we've been passed an extant DMA address
+ * then ensure the buffer has been synced to memory. If our buffer has no
+ * DMA memory, then we map the memory and mark our request to allow us to
+ * cleanup on completion.
+*/
+static int s3c_hsotg_map_dma(struct s3c_hsotg *hsotg,
+			     struct s3c_hsotg_ep *hs_ep,
+			     struct usb_request *req)
+{
+	enum dma_data_direction dir;
+	struct s3c_hsotg_req *hs_req = our_req(req);
+
+	dir = hs_ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+	/* if the length is zero, ignore the DMA data */
+	if (hs_req->req.length == 0)
+		return 0;
+
+	if (req->dma == DMA_ADDR_INVALID) {
+		dma_addr_t dma;
+
+		dma = dma_map_single(hsotg->dev, req->buf, req->length, dir);
+
+		if (unlikely(dma_mapping_error(hsotg->dev, dma)))
+			goto dma_error;
+
+		if (dma & 3) {
+			dev_err(hsotg->dev, "%s: unaligned dma buffer\n",
+				__func__);
+
+			dma_unmap_single(hsotg->dev, dma, req->length, dir);
+			return -EINVAL;
+		}
+
+		hs_req->mapped = 1;
+		req->dma = dma;
+	} else {
+		dma_sync_single(hsotg->dev, req->dma, req->length, dir);
+		hs_req->mapped = 0;
+	}
+
+	return 0;
+
+dma_error:
+	dev_err(hsotg->dev, "%s: failed to map buffer %p, %d bytes\n",
+		__func__, req->buf, req->length);
+
+	return -EIO;
+}
+
+static int s3c_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req,
+			      gfp_t gfp_flags)
+{
+	struct s3c_hsotg_req *hs_req = our_req(req);
+	struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+	struct s3c_hsotg *hs = hs_ep->parent;
+	unsigned long irqflags;
+	bool first;
+
+	dev_dbg(hs->dev, "%s: req %p: %d@%p, noi=%d, zero=%d, snok=%d\n",
+		ep->name, req, req->length, req->buf, req->no_interrupt,
+		req->zero, req->short_not_ok);
+
+	/* initialise status of the request */
+	INIT_LIST_HEAD(&hs_req->queue);
+	req->actual = 0;
+	req->status = -EINPROGRESS;
+
+	/* if we're using DMA, sync the buffers as necessary */
+	if (using_dma(hs)) {
+		int ret = s3c_hsotg_map_dma(hs, hs_ep, req);
+		if (ret)
+			return ret;
+	}
+
+	spin_lock_irqsave(&hs_ep->lock, irqflags);
+
+	first = list_empty(&hs_ep->queue);
+	list_add_tail(&hs_req->queue, &hs_ep->queue);
+
+	if (first)
+		s3c_hsotg_start_req(hs, hs_ep, hs_req, false);
+
+	spin_unlock_irqrestore(&hs_ep->lock, irqflags);
+
+	return 0;
+}
+
+static void s3c_hsotg_ep_free_request(struct usb_ep *ep,
+				      struct usb_request *req)
+{
+	struct s3c_hsotg_req *hs_req = our_req(req);
+
+	kfree(hs_req);
+}
+
+/**
+ * s3c_hsotg_complete_oursetup - setup completion callback
+ * @ep: The endpoint the request was on.
+ * @req: The request completed.
+ *
+ * Called on completion of any requests the driver itself
+ * submitted that need cleaning up.
+ */
+static void s3c_hsotg_complete_oursetup(struct usb_ep *ep,
+					struct usb_request *req)
+{
+	struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+	struct s3c_hsotg *hsotg = hs_ep->parent;
+
+	dev_dbg(hsotg->dev, "%s: ep %p, req %p\n", __func__, ep, req);
+
+	s3c_hsotg_ep_free_request(ep, req);
+}
+
+/**
+ * ep_from_windex - convert control wIndex value to endpoint
+ * @hsotg: The driver state.
+ * @windex: The control request wIndex field (in host order).
+ *
+ * Convert the given wIndex into a pointer to an driver endpoint
+ * structure, or return NULL if it is not a valid endpoint.
+*/
+static struct s3c_hsotg_ep *ep_from_windex(struct s3c_hsotg *hsotg,
+					   u32 windex)
+{
+	struct s3c_hsotg_ep *ep = &hsotg->eps[windex & 0x7F];
+	int dir = (windex & USB_DIR_IN) ? 1 : 0;
+	int idx = windex & 0x7F;
+
+	if (windex >= 0x100)
+		return NULL;
+
+	if (idx > S3C_HSOTG_EPS)
+		return NULL;
+
+	if (idx && ep->dir_in != dir)
+		return NULL;
+
+	return ep;
+}
+
+/**
+ * s3c_hsotg_send_reply - send reply to control request
+ * @hsotg: The device state
+ * @ep: Endpoint 0
+ * @buff: Buffer for request
+ * @length: Length of reply.
+ *
+ * Create a request and queue it on the given endpoint. This is useful as
+ * an internal method of sending replies to certain control requests, etc.
+ */
+static int s3c_hsotg_send_reply(struct s3c_hsotg *hsotg,
+				struct s3c_hsotg_ep *ep,
+				void *buff,
+				int length)
+{
+	struct usb_request *req;
+	int ret;
+
+	dev_dbg(hsotg->dev, "%s: buff %p, len %d\n", __func__, buff, length);
+
+	req = s3c_hsotg_ep_alloc_request(&ep->ep, GFP_ATOMIC);
+	hsotg->ep0_reply = req;
+	if (!req) {
+		dev_warn(hsotg->dev, "%s: cannot alloc req\n", __func__);
+		return -ENOMEM;
+	}
+
+	req->buf = hsotg->ep0_buff;
+	req->length = length;
+	req->zero = 1; /* always do zero-length final transfer */
+	req->complete = s3c_hsotg_complete_oursetup;
+
+	if (length)
+		memcpy(req->buf, buff, length);
+	else
+		ep->sent_zlp = 1;
+
+	ret = s3c_hsotg_ep_queue(&ep->ep, req, GFP_ATOMIC);
+	if (ret) {
+		dev_warn(hsotg->dev, "%s: cannot queue req\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * s3c_hsotg_process_req_status - process request GET_STATUS
+ * @hsotg: The device state
+ * @ctrl: USB control request
+ */
+static int s3c_hsotg_process_req_status(struct s3c_hsotg *hsotg,
+					struct usb_ctrlrequest *ctrl)
+{
+	struct s3c_hsotg_ep *ep0 = &hsotg->eps[0];
+	struct s3c_hsotg_ep *ep;
+	__le16 reply;
+	int ret;
+
+	dev_dbg(hsotg->dev, "%s: USB_REQ_GET_STATUS\n", __func__);
+
+	if (!ep0->dir_in) {
+		dev_warn(hsotg->dev, "%s: direction out?\n", __func__);
+		return -EINVAL;
+	}
+
+	switch (ctrl->bRequestType & USB_RECIP_MASK) {
+	case USB_RECIP_DEVICE:
+		reply = cpu_to_le16(0); /* bit 0 => self powered,
+					 * bit 1 => remote wakeup */
+		break;
+
+	case USB_RECIP_INTERFACE:
+		/* currently, the data result should be zero */
+		reply = cpu_to_le16(0);
+		break;
+
+	case USB_RECIP_ENDPOINT:
+		ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex));
+		if (!ep)
+			return -ENOENT;
+
+		reply = cpu_to_le16(ep->halted ? 1 : 0);
+		break;
+
+	default:
+		return 0;
+	}
+
+	if (le16_to_cpu(ctrl->wLength) != 2)
+		return -EINVAL;
+
+	ret = s3c_hsotg_send_reply(hsotg, ep0, &reply, 2);
+	if (ret) {
+		dev_err(hsotg->dev, "%s: failed to send reply\n", __func__);
+		return ret;
+	}
+
+	return 1;
+}
+
+static int s3c_hsotg_ep_sethalt(struct usb_ep *ep, int value);
+
+/**
+ * s3c_hsotg_process_req_featire - process request {SET,CLEAR}_FEATURE
+ * @hsotg: The device state
+ * @ctrl: USB control request
+ */
+static int s3c_hsotg_process_req_feature(struct s3c_hsotg *hsotg,
+					 struct usb_ctrlrequest *ctrl)
+{
+	bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
+	struct s3c_hsotg_ep *ep;
+
+	dev_dbg(hsotg->dev, "%s: %s_FEATURE\n",
+		__func__, set ? "SET" : "CLEAR");
+
+	if (ctrl->bRequestType == USB_RECIP_ENDPOINT) {
+		ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex));
+		if (!ep) {
+			dev_dbg(hsotg->dev, "%s: no endpoint for 0x%04x\n",
+				__func__, le16_to_cpu(ctrl->wIndex));
+			return -ENOENT;
+		}
+
+		switch (le16_to_cpu(ctrl->wValue)) {
+		case USB_ENDPOINT_HALT:
+			s3c_hsotg_ep_sethalt(&ep->ep, set);
+			break;
+
+		default:
+			return -ENOENT;
+		}
+	} else
+		return -ENOENT;  /* currently only deal with endpoint */
+
+	return 1;
+}
+
+/**
+ * s3c_hsotg_process_control - process a control request
+ * @hsotg: The device state
+ * @ctrl: The control request received
+ *
+ * The controller has received the SETUP phase of a control request, and
+ * needs to work out what to do next (and whether to pass it on to the
+ * gadget driver).
+ */
+static void s3c_hsotg_process_control(struct s3c_hsotg *hsotg,
+				      struct usb_ctrlrequest *ctrl)
+{
+	struct s3c_hsotg_ep *ep0 = &hsotg->eps[0];
+	int ret = 0;
+	u32 dcfg;
+
+	ep0->sent_zlp = 0;
+
+	dev_dbg(hsotg->dev, "ctrl Req=%02x, Type=%02x, V=%04x, L=%04x\n",
+		 ctrl->bRequest, ctrl->bRequestType,
+		 ctrl->wValue, ctrl->wLength);
+
+	/* record the direction of the request, for later use when enquing
+	 * packets onto EP0. */
+
+	ep0->dir_in = (ctrl->bRequestType & USB_DIR_IN) ? 1 : 0;
+	dev_dbg(hsotg->dev, "ctrl: dir_in=%d\n", ep0->dir_in);
+
+	/* if we've no data with this request, then the last part of the
+	 * transaction is going to implicitly be IN. */
+	if (ctrl->wLength == 0)
+		ep0->dir_in = 1;
+
+	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
+		switch (ctrl->bRequest) {
+		case USB_REQ_SET_ADDRESS:
+			dcfg = readl(hsotg->regs + S3C_DCFG);
+			dcfg &= ~S3C_DCFG_DevAddr_MASK;
+			dcfg |= ctrl->wValue << S3C_DCFG_DevAddr_SHIFT;
+			writel(dcfg, hsotg->regs + S3C_DCFG);
+
+			dev_info(hsotg->dev, "new address %d\n", ctrl->wValue);
+
+			ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0);
+			return;
+
+		case USB_REQ_GET_STATUS:
+			ret = s3c_hsotg_process_req_status(hsotg, ctrl);
+			break;
+
+		case USB_REQ_CLEAR_FEATURE:
+		case USB_REQ_SET_FEATURE:
+			ret = s3c_hsotg_process_req_feature(hsotg, ctrl);
+			break;
+		}
+	}
+
+	/* as a fallback, try delivering it to the driver to deal with */
+
+	if (ret == 0 && hsotg->driver) {
+		ret = hsotg->driver->setup(&hsotg->gadget, ctrl);
+		if (ret < 0)
+			dev_dbg(hsotg->dev, "driver->setup() ret %d\n", ret);
+	}
+
+	if (ret > 0) {
+		if (!ep0->dir_in) {
+			/* need to generate zlp in reply or take data */
+			/* todo - deal with any data we might be sent? */
+			ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0);
+		}
+	}
+
+	/* the request is either unhandlable, or is not formatted correctly
+	 * so respond with a STALL for the status stage to indicate failure.
+	 */
+
+	if (ret < 0) {
+		u32 reg;
+		u32 ctrl;
+
+		dev_dbg(hsotg->dev, "ep0 stall (dir=%d)\n", ep0->dir_in);
+		reg = (ep0->dir_in) ? S3C_DIEPCTL0 : S3C_DOEPCTL0;
+
+		/* S3C_DxEPCTL_Stall will be cleared by EP once it has
+		 * taken effect, so no need to clear later. */
+
+		ctrl = readl(hsotg->regs + reg);
+		ctrl |= S3C_DxEPCTL_Stall;
+		ctrl |= S3C_DxEPCTL_CNAK;
+		writel(ctrl, hsotg->regs + reg);
+
+		dev_dbg(hsotg->dev,
+			"writen DxEPCTL=0x%08x to %08x (DxEPCTL=0x%08x)\n",
+			ctrl, reg, readl(hsotg->regs + reg));
+
+		/* don't belive we need to anything more to get the EP
+		 * to reply with a STALL packet */
+	}
+}
+
+static void s3c_hsotg_enqueue_setup(struct s3c_hsotg *hsotg);
+
+/**
+ * s3c_hsotg_complete_setup - completion of a setup transfer
+ * @ep: The endpoint the request was on.
+ * @req: The request completed.
+ *
+ * Called on completion of any requests the driver itself submitted for
+ * EP0 setup packets
+ */
+static void s3c_hsotg_complete_setup(struct usb_ep *ep,
+				     struct usb_request *req)
+{
+	struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+	struct s3c_hsotg *hsotg = hs_ep->parent;
+
+	if (req->status < 0) {
+		dev_dbg(hsotg->dev, "%s: failed %d\n", __func__, req->status);
+		return;
+	}
+
+	if (req->actual == 0)
+		s3c_hsotg_enqueue_setup(hsotg);
+	else
+		s3c_hsotg_process_control(hsotg, req->buf);
+}
+
+/**
+ * s3c_hsotg_enqueue_setup - start a request for EP0 packets
+ * @hsotg: The device state.
+ *
+ * Enqueue a request on EP0 if necessary to received any SETUP packets
+ * received from the host.
+ */
+static void s3c_hsotg_enqueue_setup(struct s3c_hsotg *hsotg)
+{
+	struct usb_request *req = hsotg->ctrl_req;
+	struct s3c_hsotg_req *hs_req = our_req(req);
+	int ret;
+
+	dev_dbg(hsotg->dev, "%s: queueing setup request\n", __func__);
+
+	req->zero = 0;
+	req->length = 8;
+	req->buf = hsotg->ctrl_buff;
+	req->complete = s3c_hsotg_complete_setup;
+
+	if (!list_empty(&hs_req->queue)) {
+		dev_dbg(hsotg->dev, "%s already queued???\n", __func__);
+		return;
+	}
+
+	hsotg->eps[0].dir_in = 0;
+
+	ret = s3c_hsotg_ep_queue(&hsotg->eps[0].ep, req, GFP_ATOMIC);
+	if (ret < 0) {
+		dev_err(hsotg->dev, "%s: failed queue (%d)\n", __func__, ret);
+		/* Don't think there's much we can do other than watch the
+		 * driver fail. */
+	}
+}
+
+/**
+ * get_ep_head - return the first request on the endpoint
+ * @hs_ep: The controller endpoint to get
+ *
+ * Get the first request on the endpoint.
+*/
+static struct s3c_hsotg_req *get_ep_head(struct s3c_hsotg_ep *hs_ep)
+{
+	if (list_empty(&hs_ep->queue))
+		return NULL;
+
+	return list_first_entry(&hs_ep->queue, struct s3c_hsotg_req, queue);
+}
+
+/**
+ * s3c_hsotg_complete_request - complete a request given to us
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint the request was on.
+ * @hs_req: The request to complete.
+ * @result: The result code (0 => Ok, otherwise errno)
+ *
+ * The given request has finished, so call the necessary completion
+ * if it has one and then look to see if we can start a new request
+ * on the endpoint.
+ *
+ * Note, expects the ep to already be locked as appropriate.
+*/
+static void s3c_hsotg_complete_request(struct s3c_hsotg *hsotg,
+				       struct s3c_hsotg_ep *hs_ep,
+				       struct s3c_hsotg_req *hs_req,
+				       int result)
+{
+	bool restart;
+
+	if (!hs_req) {
+		dev_dbg(hsotg->dev, "%s: nothing to complete?\n", __func__);
+		return;
+	}
+
+	dev_dbg(hsotg->dev, "complete: ep %p %s, req %p, %d => %p\n",
+		hs_ep, hs_ep->ep.name, hs_req, result, hs_req->req.complete);
+
+	/* only replace the status if we've not already set an error
+	 * from a previous transaction */
+
+	if (hs_req->req.status == -EINPROGRESS)
+		hs_req->req.status = result;
+
+	hs_ep->req = NULL;
+	list_del_init(&hs_req->queue);
+
+	if (using_dma(hsotg))
+		s3c_hsotg_unmap_dma(hsotg, hs_ep, hs_req);
+
+	/* call the complete request with the locks off, just in case the
+	 * request tries to queue more work for this endpoint. */
+
+	if (hs_req->req.complete) {
+		spin_unlock(&hs_ep->lock);
+		hs_req->req.complete(&hs_ep->ep, &hs_req->req);
+		spin_lock(&hs_ep->lock);
+	}
+
+	/* Look to see if there is anything else to do. Note, the completion
+	 * of the previous request may have caused a new request to be started
+	 * so be careful when doing this. */
+
+	if (!hs_ep->req && result >= 0) {
+		restart = !list_empty(&hs_ep->queue);
+		if (restart) {
+			hs_req = get_ep_head(hs_ep);
+			s3c_hsotg_start_req(hsotg, hs_ep, hs_req, false);
+		}
+	}
+}
+
+/**
+ * s3c_hsotg_complete_request_lock - complete a request given to us (locked)
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint the request was on.
+ * @hs_req: The request to complete.
+ * @result: The result code (0 => Ok, otherwise errno)
+ *
+ * See s3c_hsotg_complete_request(), but called with the endpoint's
+ * lock held.
+*/
+static void s3c_hsotg_complete_request_lock(struct s3c_hsotg *hsotg,
+					    struct s3c_hsotg_ep *hs_ep,
+					    struct s3c_hsotg_req *hs_req,
+					    int result)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&hs_ep->lock, flags);
+	s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, result);
+	spin_unlock_irqrestore(&hs_ep->lock, flags);
+}
+
+/**
+ * s3c_hsotg_rx_data - receive data from the FIFO for an endpoint
+ * @hsotg: The device state.
+ * @ep_idx: The endpoint index for the data
+ * @size: The size of data in the fifo, in bytes
+ *
+ * The FIFO status shows there is data to read from the FIFO for a given
+ * endpoint, so sort out whether we need to read the data into a request
+ * that has been made for that endpoint.
+ */
+static void s3c_hsotg_rx_data(struct s3c_hsotg *hsotg, int ep_idx, int size)
+{
+	struct s3c_hsotg_ep *hs_ep = &hsotg->eps[ep_idx];
+	struct s3c_hsotg_req *hs_req = hs_ep->req;
+	void __iomem *fifo = hsotg->regs + S3C_EPFIFO(ep_idx);
+	int to_read;
+	int max_req;
+	int read_ptr;
+
+	if (!hs_req) {
+		u32 epctl = readl(hsotg->regs + S3C_DOEPCTL(ep_idx));
+		int ptr;
+
+		dev_warn(hsotg->dev,
+			 "%s: FIFO %d bytes on ep%d but no req (DxEPCTl=0x%08x)\n",
+			 __func__, size, ep_idx, epctl);
+
+		/* dump the data from the FIFO, we've nothing we can do */
+		for (ptr = 0; ptr < size; ptr += 4)
+			(void)readl(fifo);
+
+		return;
+	}
+
+	spin_lock(&hs_ep->lock);
+
+	to_read = size;
+	read_ptr = hs_req->req.actual;
+	max_req = hs_req->req.length - read_ptr;
+
+	if (to_read > max_req) {
+		/* more data appeared than we where willing
+		 * to deal with in this request.
+		 */
+
+		/* currently we don't deal this */
+		WARN_ON_ONCE(1);
+	}
+
+	dev_dbg(hsotg->dev, "%s: read %d/%d, done %d/%d\n",
+		__func__, to_read, max_req, read_ptr, hs_req->req.length);
+
+	hs_ep->total_data += to_read;
+	hs_req->req.actual += to_read;
+	to_read = DIV_ROUND_UP(to_read, 4);
+
+	/* note, we might over-write the buffer end by 3 bytes depending on
+	 * alignment of the data. */
+	readsl(fifo, hs_req->req.buf + read_ptr, to_read);
+
+	spin_unlock(&hs_ep->lock);
+}
+
+/**
+ * s3c_hsotg_send_zlp - send zero-length packet on control endpoint
+ * @hsotg: The device instance
+ * @req: The request currently on this endpoint
+ *
+ * Generate a zero-length IN packet request for terminating a SETUP
+ * transaction.
+ *
+ * Note, since we don't write any data to the TxFIFO, then it is
+ * currently belived that we do not need to wait for any space in
+ * the TxFIFO.
+ */
+static void s3c_hsotg_send_zlp(struct s3c_hsotg *hsotg,
+			       struct s3c_hsotg_req *req)
+{
+	u32 ctrl;
+
+	if (!req) {
+		dev_warn(hsotg->dev, "%s: no request?\n", __func__);
+		return;
+	}
+
+	if (req->req.length == 0) {
+		hsotg->eps[0].sent_zlp = 1;
+		s3c_hsotg_enqueue_setup(hsotg);
+		return;
+	}
+
+	hsotg->eps[0].dir_in = 1;
+	hsotg->eps[0].sent_zlp = 1;
+
+	dev_dbg(hsotg->dev, "sending zero-length packet\n");
+
+	/* issue a zero-sized packet to terminate this */
+	writel(S3C_DxEPTSIZ_MC(1) | S3C_DxEPTSIZ_PktCnt(1) |
+	       S3C_DxEPTSIZ_XferSize(0), hsotg->regs + S3C_DIEPTSIZ(0));
+
+	ctrl = readl(hsotg->regs + S3C_DIEPCTL0);
+	ctrl |= S3C_DxEPCTL_CNAK;  /* clear NAK set by core */
+	ctrl |= S3C_DxEPCTL_EPEna; /* ensure ep enabled */
+	ctrl |= S3C_DxEPCTL_USBActEp;
+	writel(ctrl, hsotg->regs + S3C_DIEPCTL0);
+}
+
+/**
+ * s3c_hsotg_handle_outdone - handle receiving OutDone/SetupDone from RXFIFO
+ * @hsotg: The device instance
+ * @epnum: The endpoint received from
+ * @was_setup: Set if processing a SetupDone event.
+ *
+ * The RXFIFO has delivered an OutDone event, which means that the data
+ * transfer for an OUT endpoint has been completed, either by a short
+ * packet or by the finish of a transfer.
+*/
+static void s3c_hsotg_handle_outdone(struct s3c_hsotg *hsotg,
+				     int epnum, bool was_setup)
+{
+	struct s3c_hsotg_ep *hs_ep = &hsotg->eps[epnum];
+	struct s3c_hsotg_req *hs_req = hs_ep->req;
+	struct usb_request *req = &hs_req->req;
+	int result = 0;
+
+	if (!hs_req) {
+		dev_dbg(hsotg->dev, "%s: no request active\n", __func__);
+		return;
+	}
+
+	if (using_dma(hsotg)) {
+		u32 epsize = readl(hsotg->regs + S3C_DOEPTSIZ(epnum));
+		unsigned size_done;
+		unsigned size_left;
+
+		/* Calculate the size of the transfer by checking how much
+		 * is left in the endpoint size register and then working it
+		 * out from the amount we loaded for the transfer.
+		 *
+		 * We need to do this as DMA pointers are always 32bit aligned
+		 * so may overshoot/undershoot the transfer.
+		 */
+
+		size_left = S3C_DxEPTSIZ_XferSize_GET(epsize);
+
+		size_done = hs_ep->size_loaded - size_left;
+		size_done += hs_ep->last_load;
+
+		req->actual = size_done;
+	}
+
+	if (req->actual < req->length && req->short_not_ok) {
+		dev_dbg(hsotg->dev, "%s: got %d/%d (short not ok) => error\n",
+			__func__, req->actual, req->length);
+
+		/* todo - what should we return here? there's no one else
+		 * even bothering to check the status. */
+	}
+
+	if (epnum == 0) {
+		if (!was_setup && req->complete != s3c_hsotg_complete_setup)
+			s3c_hsotg_send_zlp(hsotg, hs_req);
+	}
+
+	s3c_hsotg_complete_request_lock(hsotg, hs_ep, hs_req, result);
+}
+
+/**
+ * s3c_hsotg_read_frameno - read current frame number
+ * @hsotg: The device instance
+ *
+ * Return the current frame number
+*/
+static u32 s3c_hsotg_read_frameno(struct s3c_hsotg *hsotg)
+{
+	u32 dsts;
+
+	dsts = readl(hsotg->regs + S3C_DSTS);
+	dsts &= S3C_DSTS_SOFFN_MASK;
+	dsts >>= S3C_DSTS_SOFFN_SHIFT;
+
+	return dsts;
+}
+
+/**
+ * s3c_hsotg_handle_rx - RX FIFO has data
+ * @hsotg: The device instance
+ *
+ * The IRQ handler has detected that the RX FIFO has some data in it
+ * that requires processing, so find out what is in there and do the
+ * appropriate read.
+ *
+ * The RXFIFO is a true FIFO, the packets comming out are still in packet
+ * chunks, so if you have x packets received on an endpoint you'll get x
+ * FIFO events delivered, each with a packet's worth of data in it.
+ *
+ * When using DMA, we should not be processing events from the RXFIFO
+ * as the actual data should be sent to the memory directly and we turn
+ * on the completion interrupts to get notifications of transfer completion.
+ */
+void s3c_hsotg_handle_rx(struct s3c_hsotg *hsotg)
+{
+	u32 grxstsr = readl(hsotg->regs + S3C_GRXSTSP);
+	u32 epnum, status, size;
+
+	WARN_ON(using_dma(hsotg));
+
+	epnum = grxstsr & S3C_GRXSTS_EPNum_MASK;
+	status = grxstsr & S3C_GRXSTS_PktSts_MASK;
+
+	size = grxstsr & S3C_GRXSTS_ByteCnt_MASK;
+	size >>= S3C_GRXSTS_ByteCnt_SHIFT;
+
+	if (1)
+		dev_dbg(hsotg->dev, "%s: GRXSTSP=0x%08x (%d@%d)\n",
+			__func__, grxstsr, size, epnum);
+
+#define __status(x) ((x) >> S3C_GRXSTS_PktSts_SHIFT)
+
+	switch (status >> S3C_GRXSTS_PktSts_SHIFT) {
+	case __status(S3C_GRXSTS_PktSts_GlobalOutNAK):
+		dev_dbg(hsotg->dev, "GlobalOutNAK\n");
+		break;
+
+	case __status(S3C_GRXSTS_PktSts_OutDone):
+		dev_dbg(hsotg->dev, "OutDone (Frame=0x%08x)\n",
+			s3c_hsotg_read_frameno(hsotg));
+
+		if (!using_dma(hsotg))
+			s3c_hsotg_handle_outdone(hsotg, epnum, false);
+		break;
+
+	case __status(S3C_GRXSTS_PktSts_SetupDone):
+		dev_dbg(hsotg->dev,
+			"SetupDone (Frame=0x%08x, DOPEPCTL=0x%08x)\n",
+			s3c_hsotg_read_frameno(hsotg),
+			readl(hsotg->regs + S3C_DOEPCTL(0)));
+
+		s3c_hsotg_handle_outdone(hsotg, epnum, true);
+		break;
+
+	case __status(S3C_GRXSTS_PktSts_OutRX):
+		s3c_hsotg_rx_data(hsotg, epnum, size);
+		break;
+
+	case __status(S3C_GRXSTS_PktSts_SetupRX):
+		dev_dbg(hsotg->dev,
+			"SetupRX (Frame=0x%08x, DOPEPCTL=0x%08x)\n",
+			s3c_hsotg_read_frameno(hsotg),
+			readl(hsotg->regs + S3C_DOEPCTL(0)));
+
+		s3c_hsotg_rx_data(hsotg, epnum, size);
+		break;
+
+	default:
+		dev_warn(hsotg->dev, "%s: unknown status %08x\n",
+			 __func__, grxstsr);
+
+		s3c_hsotg_dump(hsotg);
+		break;
+	}
+}
+
+/**
+ * s3c_hsotg_ep0_mps - turn max packet size into register setting
+ * @mps: The maximum packet size in bytes.
+*/
+static u32 s3c_hsotg_ep0_mps(unsigned int mps)
+{
+	switch (mps) {
+	case 64:
+		return S3C_D0EPCTL_MPS_64;
+	case 32:
+		return S3C_D0EPCTL_MPS_32;
+	case 16:
+		return S3C_D0EPCTL_MPS_16;
+	case 8:
+		return S3C_D0EPCTL_MPS_8;
+	}
+
+	/* bad max packet size, warn and return invalid result */
+	WARN_ON(1);
+	return (u32)-1;
+}
+
+/**
+ * s3c_hsotg_set_ep_maxpacket - set endpoint's max-packet field
+ * @hsotg: The driver state.
+ * @ep: The index number of the endpoint
+ * @mps: The maximum packet size in bytes
+ *
+ * Configure the maximum packet size for the given endpoint, updating
+ * the hardware control registers to reflect this.
+ */
+static void s3c_hsotg_set_ep_maxpacket(struct s3c_hsotg *hsotg,
+				       unsigned int ep, unsigned int mps)
+{
+	struct s3c_hsotg_ep *hs_ep = &hsotg->eps[ep];
+	void __iomem *regs = hsotg->regs;
+	u32 mpsval;
+	u32 reg;
+
+	if (ep == 0) {
+		/* EP0 is a special case */
+		mpsval = s3c_hsotg_ep0_mps(mps);
+		if (mpsval > 3)
+			goto bad_mps;
+	} else {
+		if (mps >= S3C_DxEPCTL_MPS_LIMIT+1)
+			goto bad_mps;
+
+		mpsval = mps;
+	}
+
+	hs_ep->ep.maxpacket = mps;
+
+	/* update both the in and out endpoint controldir_ registers, even
+	 * if one of the directions may not be in use. */
+
+	reg = readl(regs + S3C_DIEPCTL(ep));
+	reg &= ~S3C_DxEPCTL_MPS_MASK;
+	reg |= mpsval;
+	writel(reg, regs + S3C_DIEPCTL(ep));
+
+	reg = readl(regs + S3C_DOEPCTL(ep));
+	reg &= ~S3C_DxEPCTL_MPS_MASK;
+	reg |= mpsval;
+	writel(reg, regs + S3C_DOEPCTL(ep));
+
+	return;
+
+bad_mps:
+	dev_err(hsotg->dev, "ep%d: bad mps of %d\n", ep, mps);
+}
+
+
+/**
+ * s3c_hsotg_trytx - check to see if anything needs transmitting
+ * @hsotg: The driver state
+ * @hs_ep: The driver endpoint to check.
+ *
+ * Check to see if there is a request that has data to send, and if so
+ * make an attempt to write data into the FIFO.
+ */
+static int s3c_hsotg_trytx(struct s3c_hsotg *hsotg,
+			   struct s3c_hsotg_ep *hs_ep)
+{
+	struct s3c_hsotg_req *hs_req = hs_ep->req;
+
+	if (!hs_ep->dir_in || !hs_req)
+		return 0;
+
+	if (hs_req->req.actual < hs_req->req.length) {
+		dev_dbg(hsotg->dev, "trying to write more for ep%d\n",
+			hs_ep->index);
+		return s3c_hsotg_write_fifo(hsotg, hs_ep, hs_req);
+	}
+
+	return 0;
+}
+
+/**
+ * s3c_hsotg_complete_in - complete IN transfer
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint that has just completed.
+ *
+ * An IN transfer has been completed, update the transfer's state and then
+ * call the relevant completion routines.
+ */
+static void s3c_hsotg_complete_in(struct s3c_hsotg *hsotg,
+				  struct s3c_hsotg_ep *hs_ep)
+{
+	struct s3c_hsotg_req *hs_req = hs_ep->req;
+	u32 epsize = readl(hsotg->regs + S3C_DIEPTSIZ(hs_ep->index));
+	int size_left, size_done;
+
+	if (!hs_req) {
+		dev_dbg(hsotg->dev, "XferCompl but no req\n");
+		return;
+	}
+
+	/* Calculate the size of the transfer by checking how much is left
+	 * in the endpoint size register and then working it out from
+	 * the amount we loaded for the transfer.
+	 *
+	 * We do this even for DMA, as the transfer may have incremented
+	 * past the end of the buffer (DMA transfers are always 32bit
+	 * aligned).
+	 */
+
+	size_left = S3C_DxEPTSIZ_XferSize_GET(epsize);
+
+	size_done = hs_ep->size_loaded - size_left;
+	size_done += hs_ep->last_load;
+
+	if (hs_req->req.actual != size_done)
+		dev_dbg(hsotg->dev, "%s: adjusting size done %d => %d\n",
+			__func__, hs_req->req.actual, size_done);
+
+	hs_req->req.actual = size_done;
+
+	/* if we did all of the transfer, and there is more data left
+	 * around, then try restarting the rest of the request */
+
+	if (!size_left && hs_req->req.actual < hs_req->req.length) {
+		dev_dbg(hsotg->dev, "%s trying more for req...\n", __func__);
+		s3c_hsotg_start_req(hsotg, hs_ep, hs_req, true);
+	} else
+		s3c_hsotg_complete_request_lock(hsotg, hs_ep, hs_req, 0);
+}
+
+/**
+ * s3c_hsotg_epint - handle an in/out endpoint interrupt
+ * @hsotg: The driver state
+ * @idx: The index for the endpoint (0..15)
+ * @dir_in: Set if this is an IN endpoint
+ *
+ * Process and clear any interrupt pending for an individual endpoint
+*/
+static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx,
+			    int dir_in)
+{
+	struct s3c_hsotg_ep *hs_ep = &hsotg->eps[idx];
+	u32 epint_reg = dir_in ? S3C_DIEPINT(idx) : S3C_DOEPINT(idx);
+	u32 epctl_reg = dir_in ? S3C_DIEPCTL(idx) : S3C_DOEPCTL(idx);
+	u32 epsiz_reg = dir_in ? S3C_DIEPTSIZ(idx) : S3C_DOEPTSIZ(idx);
+	u32 ints;
+	u32 clear = 0;
+
+	ints = readl(hsotg->regs + epint_reg);
+
+	dev_dbg(hsotg->dev, "%s: ep%d(%s) DxEPINT=0x%08x\n",
+		__func__, idx, dir_in ? "in" : "out", ints);
+
+	if (ints & S3C_DxEPINT_XferCompl) {
+		dev_dbg(hsotg->dev,
+			"%s: XferCompl: DxEPCTL=0x%08x, DxEPTSIZ=%08x\n",
+			__func__, readl(hsotg->regs + epctl_reg),
+			readl(hsotg->regs + epsiz_reg));
+
+		/* we get OutDone from the FIFO, so we only need to look
+		 * at completing IN requests here */
+		if (dir_in) {
+			s3c_hsotg_complete_in(hsotg, hs_ep);
+
+			if (idx == 0)
+				s3c_hsotg_enqueue_setup(hsotg);
+		} else if (using_dma(hsotg)) {
+			/* We're using DMA, we need to fire an OutDone here
+			 * as we ignore the RXFIFO. */
+
+			s3c_hsotg_handle_outdone(hsotg, idx, false);
+		}
+
+		clear |= S3C_DxEPINT_XferCompl;
+	}
+
+	if (ints & S3C_DxEPINT_EPDisbld) {
+		dev_dbg(hsotg->dev, "%s: EPDisbld\n", __func__);
+		clear |= S3C_DxEPINT_EPDisbld;
+	}
+
+	if (ints & S3C_DxEPINT_AHBErr) {
+		dev_dbg(hsotg->dev, "%s: AHBErr\n", __func__);
+		clear |= S3C_DxEPINT_AHBErr;
+	}
+
+	if (ints & S3C_DxEPINT_Setup) {  /* Setup or Timeout */
+		dev_dbg(hsotg->dev, "%s: Setup/Timeout\n",  __func__);
+
+		if (using_dma(hsotg) && idx == 0) {
+			/* this is the notification we've received a
+			 * setup packet. In non-DMA mode we'd get this
+			 * from the RXFIFO, instead we need to process
+			 * the setup here. */
+
+			if (dir_in)
+				WARN_ON_ONCE(1);
+			else
+				s3c_hsotg_handle_outdone(hsotg, 0, true);
+		}
+
+		clear |= S3C_DxEPINT_Setup;
+	}
+
+	if (ints & S3C_DxEPINT_Back2BackSetup) {
+		dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__);
+		clear |= S3C_DxEPINT_Back2BackSetup;
+	}
+
+	if (dir_in) {
+		/* not sure if this is important, but we'll clear it anyway
+		 */
+		if (ints & S3C_DIEPMSK_INTknTXFEmpMsk) {
+			dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n",
+				__func__, idx);
+			clear |= S3C_DIEPMSK_INTknTXFEmpMsk;
+		}
+
+		/* this probably means something bad is happening */
+		if (ints & S3C_DIEPMSK_INTknEPMisMsk) {
+			dev_warn(hsotg->dev, "%s: ep%d: INTknEP\n",
+				 __func__, idx);
+			clear |= S3C_DIEPMSK_INTknEPMisMsk;
+		}
+	}
+
+	writel(clear, hsotg->regs + epint_reg);
+}
+
+/**
+ * s3c_hsotg_irq_enumdone - Handle EnumDone interrupt (enumeration done)
+ * @hsotg: The device state.
+ *
+ * Handle updating the device settings after the enumeration phase has
+ * been completed.
+*/
+static void s3c_hsotg_irq_enumdone(struct s3c_hsotg *hsotg)
+{
+	u32 dsts = readl(hsotg->regs + S3C_DSTS);
+	int ep0_mps = 0, ep_mps;
+
+	/* This should signal the finish of the enumeration phase
+	 * of the USB handshaking, so we should now know what rate
+	 * we connected at. */
+
+	dev_dbg(hsotg->dev, "EnumDone (DSTS=0x%08x)\n", dsts);
+
+	/* note, since we're limited by the size of transfer on EP0, and
+	 * it seems IN transfers must be a even number of packets we do
+	 * not advertise a 64byte MPS on EP0. */
+
+	/* catch both EnumSpd_FS and EnumSpd_FS48 */
+	switch (dsts & S3C_DSTS_EnumSpd_MASK) {
+	case S3C_DSTS_EnumSpd_FS:
+	case S3C_DSTS_EnumSpd_FS48:
+		hsotg->gadget.speed = USB_SPEED_FULL;
+		dev_info(hsotg->dev, "new device is full-speed\n");
+
+		ep0_mps = EP0_MPS_LIMIT;
+		ep_mps = 64;
+		break;
+
+	case S3C_DSTS_EnumSpd_HS:
+		dev_info(hsotg->dev, "new device is high-speed\n");
+		hsotg->gadget.speed = USB_SPEED_HIGH;
+
+		ep0_mps = EP0_MPS_LIMIT;
+		ep_mps = 512;
+		break;
+
+	case S3C_DSTS_EnumSpd_LS:
+		hsotg->gadget.speed = USB_SPEED_LOW;
+		dev_info(hsotg->dev, "new device is low-speed\n");
+
+		/* note, we don't actually support LS in this driver at the
+		 * moment, and the documentation seems to imply that it isn't
+		 * supported by the PHYs on some of the devices.
+		 */
+		break;
+	}
+
+	/* we should now know the maximum packet size for an
+	 * endpoint, so set the endpoints to a default value. */
+
+	if (ep0_mps) {
+		int i;
+		s3c_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps);
+		for (i = 1; i < S3C_HSOTG_EPS; i++)
+			s3c_hsotg_set_ep_maxpacket(hsotg, i, ep_mps);
+	}
+
+	/* ensure after enumeration our EP0 is active */
+
+	s3c_hsotg_enqueue_setup(hsotg);
+
+	dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
+		readl(hsotg->regs + S3C_DIEPCTL0),
+		readl(hsotg->regs + S3C_DOEPCTL0));
+}
+
+/**
+ * kill_all_requests - remove all requests from the endpoint's queue
+ * @hsotg: The device state.
+ * @ep: The endpoint the requests may be on.
+ * @result: The result code to use.
+ * @force: Force removal of any current requests
+ *
+ * Go through the requests on the given endpoint and mark them
+ * completed with the given result code.
+ */
+static void kill_all_requests(struct s3c_hsotg *hsotg,
+			      struct s3c_hsotg_ep *ep,
+			      int result, bool force)
+{
+	struct s3c_hsotg_req *req, *treq;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ep->lock, flags);
+
+	list_for_each_entry_safe(req, treq, &ep->queue, queue) {
+		/* currently, we can't do much about an already
+		 * running request on an in endpoint */
+
+		if (ep->req == req && ep->dir_in && !force)
+			continue;
+
+		s3c_hsotg_complete_request(hsotg, ep, req,
+					   result);
+	}
+
+	spin_unlock_irqrestore(&ep->lock, flags);
+}
+
+#define call_gadget(_hs, _entry) \
+	if ((_hs)->gadget.speed != USB_SPEED_UNKNOWN &&	\
+	    (_hs)->driver && (_hs)->driver->_entry)	\
+		(_hs)->driver->_entry(&(_hs)->gadget);
+
+/**
+ * s3c_hsotg_disconnect_irq - disconnect irq service
+ * @hsotg: The device state.
+ *
+ * A disconnect IRQ has been received, meaning that the host has
+ * lost contact with the bus. Remove all current transactions
+ * and signal the gadget driver that this has happened.
+*/
+static void s3c_hsotg_disconnect_irq(struct s3c_hsotg *hsotg)
+{
+	unsigned ep;
+
+	for (ep = 0; ep < S3C_HSOTG_EPS; ep++)
+		kill_all_requests(hsotg, &hsotg->eps[ep], -ESHUTDOWN, true);
+
+	call_gadget(hsotg, disconnect);
+}
+
+/**
+ * s3c_hsotg_irq_fifoempty - TX FIFO empty interrupt handler
+ * @hsotg: The device state:
+ * @periodic: True if this is a periodic FIFO interrupt
+ */
+static void s3c_hsotg_irq_fifoempty(struct s3c_hsotg *hsotg, bool periodic)
+{
+	struct s3c_hsotg_ep *ep;
+	int epno, ret;
+
+	/* look through for any more data to transmit */
+
+	for (epno = 0; epno < S3C_HSOTG_EPS; epno++) {
+		ep = &hsotg->eps[epno];
+
+		if (!ep->dir_in)
+			continue;
+
+		if ((periodic && !ep->periodic) ||
+		    (!periodic && ep->periodic))
+			continue;
+
+		ret = s3c_hsotg_trytx(hsotg, ep);
+		if (ret < 0)
+			break;
+	}
+}
+
+static struct s3c_hsotg *our_hsotg;
+
+/* IRQ flags which will trigger a retry around the IRQ loop */
+#define IRQ_RETRY_MASK (S3C_GINTSTS_NPTxFEmp | \
+			S3C_GINTSTS_PTxFEmp |  \
+			S3C_GINTSTS_RxFLvl)
+
+/**
+ * s3c_hsotg_irq - handle device interrupt
+ * @irq: The IRQ number triggered
+ * @pw: The pw value when registered the handler.
+ */
+static irqreturn_t s3c_hsotg_irq(int irq, void *pw)
+{
+	struct s3c_hsotg *hsotg = pw;
+	int retry_count = 8;
+	u32 gintsts;
+	u32 gintmsk;
+
+irq_retry:
+	gintsts = readl(hsotg->regs + S3C_GINTSTS);
+	gintmsk = readl(hsotg->regs + S3C_GINTMSK);
+
+	dev_dbg(hsotg->dev, "%s: %08x %08x (%08x) retry %d\n",
+		__func__, gintsts, gintsts & gintmsk, gintmsk, retry_count);
+
+	gintsts &= gintmsk;
+
+	if (gintsts & S3C_GINTSTS_OTGInt) {
+		u32 otgint = readl(hsotg->regs + S3C_GOTGINT);
+
+		dev_info(hsotg->dev, "OTGInt: %08x\n", otgint);
+
+		writel(otgint, hsotg->regs + S3C_GOTGINT);
+		writel(S3C_GINTSTS_OTGInt, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_DisconnInt) {
+		dev_dbg(hsotg->dev, "%s: DisconnInt\n", __func__);
+		writel(S3C_GINTSTS_DisconnInt, hsotg->regs + S3C_GINTSTS);
+
+		s3c_hsotg_disconnect_irq(hsotg);
+	}
+
+	if (gintsts & S3C_GINTSTS_SessReqInt) {
+		dev_dbg(hsotg->dev, "%s: SessReqInt\n", __func__);
+		writel(S3C_GINTSTS_SessReqInt, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_EnumDone) {
+		s3c_hsotg_irq_enumdone(hsotg);
+		writel(S3C_GINTSTS_EnumDone, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_ConIDStsChng) {
+		dev_dbg(hsotg->dev, "ConIDStsChg (DSTS=0x%08x, GOTCTL=%08x)\n",
+			readl(hsotg->regs + S3C_DSTS),
+			readl(hsotg->regs + S3C_GOTGCTL));
+
+		writel(S3C_GINTSTS_ConIDStsChng, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & (S3C_GINTSTS_OEPInt | S3C_GINTSTS_IEPInt)) {
+		u32 daint = readl(hsotg->regs + S3C_DAINT);
+		u32 daint_out = daint >> S3C_DAINT_OutEP_SHIFT;
+		u32 daint_in = daint & ~(daint_out << S3C_DAINT_OutEP_SHIFT);
+		int ep;
+
+		dev_dbg(hsotg->dev, "%s: daint=%08x\n", __func__, daint);
+
+		for (ep = 0; ep < 15 && daint_out; ep++, daint_out >>= 1) {
+			if (daint_out & 1)
+				s3c_hsotg_epint(hsotg, ep, 0);
+		}
+
+		for (ep = 0; ep < 15 && daint_in; ep++, daint_in >>= 1) {
+			if (daint_in & 1)
+				s3c_hsotg_epint(hsotg, ep, 1);
+		}
+
+		writel(daint, hsotg->regs + S3C_DAINT);
+		writel(gintsts & (S3C_GINTSTS_OEPInt | S3C_GINTSTS_IEPInt),
+		       hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_USBRst) {
+		dev_info(hsotg->dev, "%s: USBRst\n", __func__);
+		dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n",
+			readl(hsotg->regs + S3C_GNPTXSTS));
+
+		kill_all_requests(hsotg, &hsotg->eps[0], -ECONNRESET, true);
+
+		/* it seems after a reset we can end up with a situation
+		 * where the TXFIFO still has data in it... try flushing
+		 * it to remove anything that may still be in it.
+		 */
+
+		if (1) {
+			writel(S3C_GRSTCTL_TxFNum(0) | S3C_GRSTCTL_TxFFlsh,
+			       hsotg->regs + S3C_GRSTCTL);
+
+			dev_info(hsotg->dev, "GNPTXSTS=%08x\n",
+				 readl(hsotg->regs + S3C_GNPTXSTS));
+		}
+
+		s3c_hsotg_enqueue_setup(hsotg);
+
+		writel(S3C_GINTSTS_USBRst, hsotg->regs + S3C_GINTSTS);
+	}
+
+	/* check both FIFOs */
+
+	if (gintsts & S3C_GINTSTS_NPTxFEmp) {
+		dev_dbg(hsotg->dev, "NPTxFEmp\n");
+
+		/* Disable the interrupt to stop it happening again
+		 * unless one of these endpoint routines decides that
+		 * it needs re-enabling */
+
+		s3c_hsotg_disable_gsint(hsotg, S3C_GINTSTS_NPTxFEmp);
+		s3c_hsotg_irq_fifoempty(hsotg, false);
+
+		writel(S3C_GINTSTS_NPTxFEmp, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_PTxFEmp) {
+		dev_dbg(hsotg->dev, "PTxFEmp\n");
+
+		/* See note in S3C_GINTSTS_NPTxFEmp */
+
+		s3c_hsotg_disable_gsint(hsotg, S3C_GINTSTS_PTxFEmp);
+		s3c_hsotg_irq_fifoempty(hsotg, true);
+
+		writel(S3C_GINTSTS_PTxFEmp, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_RxFLvl) {
+		/* note, since GINTSTS_RxFLvl doubles as FIFO-not-empty,
+		 * we need to retry s3c_hsotg_handle_rx if this is still
+		 * set. */
+
+		s3c_hsotg_handle_rx(hsotg);
+		writel(S3C_GINTSTS_RxFLvl, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_ModeMis) {
+		dev_warn(hsotg->dev, "warning, mode mismatch triggered\n");
+		writel(S3C_GINTSTS_ModeMis, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_USBSusp) {
+		dev_info(hsotg->dev, "S3C_GINTSTS_USBSusp\n");
+		writel(S3C_GINTSTS_USBSusp, hsotg->regs + S3C_GINTSTS);
+
+		call_gadget(hsotg, suspend);
+	}
+
+	if (gintsts & S3C_GINTSTS_WkUpInt) {
+		dev_info(hsotg->dev, "S3C_GINTSTS_WkUpIn\n");
+		writel(S3C_GINTSTS_WkUpInt, hsotg->regs + S3C_GINTSTS);
+
+		call_gadget(hsotg, resume);
+	}
+
+	if (gintsts & S3C_GINTSTS_ErlySusp) {
+		dev_dbg(hsotg->dev, "S3C_GINTSTS_ErlySusp\n");
+		writel(S3C_GINTSTS_ErlySusp, hsotg->regs + S3C_GINTSTS);
+	}
+
+	/* these next two seem to crop-up occasionally causing the core
+	 * to shutdown the USB transfer, so try clearing them and logging
+	 * the occurence. */
+
+	if (gintsts & S3C_GINTSTS_GOUTNakEff) {
+		dev_info(hsotg->dev, "GOUTNakEff triggered\n");
+
+		s3c_hsotg_dump(hsotg);
+
+		writel(S3C_DCTL_CGOUTNak, hsotg->regs + S3C_DCTL);
+		writel(S3C_GINTSTS_GOUTNakEff, hsotg->regs + S3C_GINTSTS);
+	}
+
+	if (gintsts & S3C_GINTSTS_GINNakEff) {
+		dev_info(hsotg->dev, "GINNakEff triggered\n");
+
+		s3c_hsotg_dump(hsotg);
+
+		writel(S3C_DCTL_CGNPInNAK, hsotg->regs + S3C_DCTL);
+		writel(S3C_GINTSTS_GINNakEff, hsotg->regs + S3C_GINTSTS);
+	}
+
+	/* if we've had fifo events, we should try and go around the
+	 * loop again to see if there's any point in returning yet. */
+
+	if (gintsts & IRQ_RETRY_MASK && --retry_count > 0)
+			goto irq_retry;
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * s3c_hsotg_ep_enable - enable the given endpoint
+ * @ep: The USB endpint to configure
+ * @desc: The USB endpoint descriptor to configure with.
+ *
+ * This is called from the USB gadget code's usb_ep_enable().
+*/
+static int s3c_hsotg_ep_enable(struct usb_ep *ep,
+			       const struct usb_endpoint_descriptor *desc)
+{
+	struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+	struct s3c_hsotg *hsotg = hs_ep->parent;
+	unsigned long flags;
+	int index = hs_ep->index;
+	u32 epctrl_reg;
+	u32 epctrl;
+	u32 mps;
+	int dir_in;
+
+	dev_dbg(hsotg->dev,
+		"%s: ep %s: a 0x%02x, attr 0x%02x, mps 0x%04x, intr %d\n",
+		__func__, ep->name, desc->bEndpointAddress, desc->bmAttributes,
+		desc->wMaxPacketSize, desc->bInterval);
+
+	/* not to be called for EP0 */
+	WARN_ON(index == 0);
+
+	dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0;
+	if (dir_in != hs_ep->dir_in) {
+		dev_err(hsotg->dev, "%s: direction mismatch!\n", __func__);
+		return -EINVAL;
+	}
+
+	mps = le16_to_cpu(desc->wMaxPacketSize);
+
+	/* note, we handle this here instead of s3c_hsotg_set_ep_maxpacket */
+
+	epctrl_reg = dir_in ? S3C_DIEPCTL(index) : S3C_DOEPCTL(index);
+	epctrl = readl(hsotg->regs + epctrl_reg);
+
+	dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n",
+		__func__, epctrl, epctrl_reg);
+
+	spin_lock_irqsave(&hs_ep->lock, flags);
+
+	epctrl &= ~(S3C_DxEPCTL_EPType_MASK | S3C_DxEPCTL_MPS_MASK);
+	epctrl |= S3C_DxEPCTL_MPS(mps);
+
+	/* mark the endpoint as active, otherwise the core may ignore
+	 * transactions entirely for this endpoint */
+	epctrl |= S3C_DxEPCTL_USBActEp;
+
+	/* set the NAK status on the endpoint, otherwise we might try and
+	 * do something with data that we've yet got a request to process
+	 * since the RXFIFO will take data for an endpoint even if the
+	 * size register hasn't been set.
+	 */
+
+	epctrl |= S3C_DxEPCTL_SNAK;
+
+	/* update the endpoint state */
+	hs_ep->ep.maxpacket = mps;
+
+	/* default, set to non-periodic */
+	hs_ep->periodic = 0;
+
+	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_ISOC:
+		dev_err(hsotg->dev, "no current ISOC support\n");
+		return -EINVAL;
+
+	case USB_ENDPOINT_XFER_BULK:
+		epctrl |= S3C_DxEPCTL_EPType_Bulk;
+		break;
+
+	case USB_ENDPOINT_XFER_INT:
+		if (dir_in) {
+			/* Allocate our TxFNum by simply using the index
+			 * of the endpoint for the moment. We could do
+			 * something better if the host indicates how
+			 * many FIFOs we are expecting to use. */
+
+			hs_ep->periodic = 1;
+			epctrl |= S3C_DxEPCTL_TxFNum(index);
+		}
+
+		epctrl |= S3C_DxEPCTL_EPType_Intterupt;
+		break;
+
+	case USB_ENDPOINT_XFER_CONTROL:
+		epctrl |= S3C_DxEPCTL_EPType_Control;
+		break;
+	}
+
+	/* for non control endpoints, set PID to D0 */
+	if (index)
+		epctrl |= S3C_DxEPCTL_SetD0PID;
+
+	dev_dbg(hsotg->dev, "%s: write DxEPCTL=0x%08x\n",
+		__func__, epctrl);
+
+	writel(epctrl, hsotg->regs + epctrl_reg);
+	dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x\n",
+		__func__, readl(hsotg->regs + epctrl_reg));
+
+	/* enable the endpoint interrupt */
+	s3c_hsotg_ctrl_epint(hsotg, index, dir_in, 1);
+
+	spin_unlock_irqrestore(&hs_ep->lock, flags);
+	return 0;
+}
+
+static int s3c_hsotg_ep_disable(struct usb_ep *ep)
+{
+	struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+	struct s3c_hsotg *hsotg = hs_ep->parent;
+	int dir_in = hs_ep->dir_in;
+	int index = hs_ep->index;
+	unsigned long flags;
+	u32 epctrl_reg;
+	u32 ctrl;
+
+	dev_info(hsotg->dev, "%s(ep %p)\n", __func__, ep);
+
+	if (ep == &hsotg->eps[0].ep) {
+		dev_err(hsotg->dev, "%s: called for ep0\n", __func__);
+		return -EINVAL;
+	}
+
+	epctrl_reg = dir_in ? S3C_DIEPCTL(index) : S3C_DOEPCTL(index);
+
+	/* terminate all requests with shutdown */
+	kill_all_requests(hsotg, hs_ep, -ESHUTDOWN, false);
+
+	spin_lock_irqsave(&hs_ep->lock, flags);
+
+	ctrl = readl(hsotg->regs + epctrl_reg);
+	ctrl &= ~S3C_DxEPCTL_EPEna;
+	ctrl &= ~S3C_DxEPCTL_USBActEp;
+	ctrl |= S3C_DxEPCTL_SNAK;
+
+	dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
+	writel(ctrl, hsotg->regs + epctrl_reg);
+
+	/* disable endpoint interrupts */
+	s3c_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 0);
+
+	spin_unlock_irqrestore(&hs_ep->lock, flags);
+	return 0;
+}
+
+/**
+ * on_list - check request is on the given endpoint
+ * @ep: The endpoint to check.
+ * @test: The request to test if it is on the endpoint.
+*/
+static bool on_list(struct s3c_hsotg_ep *ep, struct s3c_hsotg_req *test)
+{
+	struct s3c_hsotg_req *req, *treq;
+
+	list_for_each_entry_safe(req, treq, &ep->queue, queue) {
+		if (req == test)
+			return true;
+	}
+
+	return false;
+}
+
+static int s3c_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
+{
+	struct s3c_hsotg_req *hs_req = our_req(req);
+	struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+	struct s3c_hsotg *hs = hs_ep->parent;
+	unsigned long flags;
+
+	dev_info(hs->dev, "ep_dequeue(%p,%p)\n", ep, req);
+
+	if (hs_req == hs_ep->req) {
+		dev_dbg(hs->dev, "%s: already in progress\n", __func__);
+		return -EINPROGRESS;
+	}
+
+	spin_lock_irqsave(&hs_ep->lock, flags);
+
+	if (!on_list(hs_ep, hs_req)) {
+		spin_unlock_irqrestore(&hs_ep->lock, flags);
+		return -EINVAL;
+	}
+
+	s3c_hsotg_complete_request(hs, hs_ep, hs_req, -ECONNRESET);
+	spin_unlock_irqrestore(&hs_ep->lock, flags);
+
+	return 0;
+}
+
+static int s3c_hsotg_ep_sethalt(struct usb_ep *ep, int value)
+{
+	struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+	struct s3c_hsotg *hs = hs_ep->parent;
+	int index = hs_ep->index;
+	unsigned long irqflags;
+	u32 epreg;
+	u32 epctl;
+
+	dev_info(hs->dev, "%s(ep %p %s, %d)\n", __func__, ep, ep->name, value);
+
+	spin_lock_irqsave(&hs_ep->lock, irqflags);
+
+	/* write both IN and OUT control registers */
+
+	epreg = S3C_DIEPCTL(index);
+	epctl = readl(hs->regs + epreg);
+
+	if (value)
+		epctl |= S3C_DxEPCTL_Stall;
+	else
+		epctl &= ~S3C_DxEPCTL_Stall;
+
+	writel(epctl, hs->regs + epreg);
+
+	epreg = S3C_DOEPCTL(index);
+	epctl = readl(hs->regs + epreg);
+
+	if (value)
+		epctl |= S3C_DxEPCTL_Stall;
+	else
+		epctl &= ~S3C_DxEPCTL_Stall;
+
+	writel(epctl, hs->regs + epreg);
+
+	spin_unlock_irqrestore(&hs_ep->lock, irqflags);
+
+	return 0;
+}
+
+static struct usb_ep_ops s3c_hsotg_ep_ops = {
+	.enable		= s3c_hsotg_ep_enable,
+	.disable	= s3c_hsotg_ep_disable,
+	.alloc_request	= s3c_hsotg_ep_alloc_request,
+	.free_request	= s3c_hsotg_ep_free_request,
+	.queue		= s3c_hsotg_ep_queue,
+	.dequeue	= s3c_hsotg_ep_dequeue,
+	.set_halt	= s3c_hsotg_ep_sethalt,
+	/* note, don't belive we have any call for the fifo routines */
+};
+
+/**
+ * s3c_hsotg_corereset - issue softreset to the core
+ * @hsotg: The device state
+ *
+ * Issue a soft reset to the core, and await the core finishing it.
+*/
+static int s3c_hsotg_corereset(struct s3c_hsotg *hsotg)
+{
+	int timeout;
+	u32 grstctl;
+
+	dev_dbg(hsotg->dev, "resetting core\n");
+
+	/* issue soft reset */
+	writel(S3C_GRSTCTL_CSftRst, hsotg->regs + S3C_GRSTCTL);
+
+	timeout = 1000;
+	do {
+		grstctl = readl(hsotg->regs + S3C_GRSTCTL);
+	} while (!(grstctl & S3C_GRSTCTL_CSftRst) && timeout-- > 0);
+
+	if (!grstctl & S3C_GRSTCTL_CSftRst) {
+		dev_err(hsotg->dev, "Failed to get CSftRst asserted\n");
+		return -EINVAL;
+	}
+
+	timeout = 1000;
+
+	while (1) {
+		u32 grstctl = readl(hsotg->regs + S3C_GRSTCTL);
+
+		if (timeout-- < 0) {
+			dev_info(hsotg->dev,
+				 "%s: reset failed, GRSTCTL=%08x\n",
+				 __func__, grstctl);
+			return -ETIMEDOUT;
+		}
+
+		if (grstctl & S3C_GRSTCTL_CSftRst)
+			continue;
+
+		if (!(grstctl & S3C_GRSTCTL_AHBIdle))
+			continue;
+
+		break; 		/* reset done */
+	}
+
+	dev_dbg(hsotg->dev, "reset successful\n");
+	return 0;
+}
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+	struct s3c_hsotg *hsotg = our_hsotg;
+	int ret;
+
+	if (!hsotg) {
+		printk(KERN_ERR "%s: called with no device\n", __func__);
+		return -ENODEV;
+	}
+
+	if (!driver) {
+		dev_err(hsotg->dev, "%s: no driver\n", __func__);
+		return -EINVAL;
+	}
+
+	if (driver->speed != USB_SPEED_HIGH &&
+	    driver->speed != USB_SPEED_FULL) {
+		dev_err(hsotg->dev, "%s: bad speed\n", __func__);
+	}
+
+	if (!driver->bind || !driver->setup) {
+		dev_err(hsotg->dev, "%s: missing entry points\n", __func__);
+		return -EINVAL;
+	}
+
+	WARN_ON(hsotg->driver);
+
+	driver->driver.bus = NULL;
+	hsotg->driver = driver;
+	hsotg->gadget.dev.driver = &driver->driver;
+	hsotg->gadget.dev.dma_mask = hsotg->dev->dma_mask;
+	hsotg->gadget.speed = USB_SPEED_UNKNOWN;
+
+	ret = device_add(&hsotg->gadget.dev);
+	if (ret) {
+		dev_err(hsotg->dev, "failed to register gadget device\n");
+		goto err;
+	}
+
+	ret = driver->bind(&hsotg->gadget);
+	if (ret) {
+		dev_err(hsotg->dev, "failed bind %s\n", driver->driver.name);
+
+		hsotg->gadget.dev.driver = NULL;
+		hsotg->driver = NULL;
+		goto err;
+	}
+
+	/* we must now enable ep0 ready for host detection and then
+	 * set configuration. */
+
+	s3c_hsotg_corereset(hsotg);
+
+	/* set the PLL on, remove the HNP/SRP and set the PHY */
+	writel(S3C_GUSBCFG_PHYIf16 | S3C_GUSBCFG_TOutCal(7) |
+	       (0x5 << 10), hsotg->regs + S3C_GUSBCFG);
+
+	/* looks like soft-reset changes state of FIFOs */
+	s3c_hsotg_init_fifo(hsotg);
+
+	__orr32(hsotg->regs + S3C_DCTL, S3C_DCTL_SftDiscon);
+
+	writel(1 << 18 | S3C_DCFG_DevSpd_HS,  hsotg->regs + S3C_DCFG);
+
+	writel(S3C_GINTSTS_DisconnInt | S3C_GINTSTS_SessReqInt |
+	       S3C_GINTSTS_ConIDStsChng | S3C_GINTSTS_USBRst |
+	       S3C_GINTSTS_EnumDone | S3C_GINTSTS_OTGInt |
+	       S3C_GINTSTS_USBSusp | S3C_GINTSTS_WkUpInt |
+	       S3C_GINTSTS_GOUTNakEff | S3C_GINTSTS_GINNakEff |
+	       S3C_GINTSTS_ErlySusp,
+	       hsotg->regs + S3C_GINTMSK);
+
+	if (using_dma(hsotg))
+		writel(S3C_GAHBCFG_GlblIntrEn | S3C_GAHBCFG_DMAEn |
+		       S3C_GAHBCFG_HBstLen_Incr4,
+		       hsotg->regs + S3C_GAHBCFG);
+	else
+		writel(S3C_GAHBCFG_GlblIntrEn, hsotg->regs + S3C_GAHBCFG);
+
+	/* Enabling INTknTXFEmpMsk here seems to be a big mistake, we end
+	 * up being flooded with interrupts if the host is polling the
+	 * endpoint to try and read data. */
+
+	writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk |
+	       S3C_DIEPMSK_INTknEPMisMsk |
+	       S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk,
+	       hsotg->regs + S3C_DIEPMSK);
+
+	/* don't need XferCompl, we get that from RXFIFO in slave mode. In
+	 * DMA mode we may need this. */
+	writel(S3C_DOEPMSK_SetupMsk | S3C_DOEPMSK_AHBErrMsk |
+	       S3C_DOEPMSK_EPDisbldMsk |
+	       using_dma(hsotg) ? (S3C_DIEPMSK_XferComplMsk |
+				   S3C_DIEPMSK_TimeOUTMsk) : 0,
+	       hsotg->regs + S3C_DOEPMSK);
+
+	writel(0, hsotg->regs + S3C_DAINTMSK);
+
+	dev_info(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
+		 readl(hsotg->regs + S3C_DIEPCTL0),
+		 readl(hsotg->regs + S3C_DOEPCTL0));
+
+	/* enable in and out endpoint interrupts */
+	s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_OEPInt | S3C_GINTSTS_IEPInt);
+
+	/* Enable the RXFIFO when in slave mode, as this is how we collect
+	 * the data. In DMA mode, we get events from the FIFO but also
+	 * things we cannot process, so do not use it. */
+	if (!using_dma(hsotg))
+		s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_RxFLvl);
+
+	/* Enable interrupts for EP0 in and out */
+	s3c_hsotg_ctrl_epint(hsotg, 0, 0, 1);
+	s3c_hsotg_ctrl_epint(hsotg, 0, 1, 1);
+
+	__orr32(hsotg->regs + S3C_DCTL, S3C_DCTL_PWROnPrgDone);
+	udelay(10);  /* see openiboot */
+	__bic32(hsotg->regs + S3C_DCTL, S3C_DCTL_PWROnPrgDone);
+
+	dev_info(hsotg->dev, "DCTL=0x%08x\n", readl(hsotg->regs + S3C_DCTL));
+
+	/* S3C_DxEPCTL_USBActEp says RO in manual, but seems to be set by
+	   writing to the EPCTL register.. */
+
+	/* set to read 1 8byte packet */
+	writel(S3C_DxEPTSIZ_MC(1) | S3C_DxEPTSIZ_PktCnt(1) |
+	       S3C_DxEPTSIZ_XferSize(8), hsotg->regs + DOEPTSIZ0);
+
+	writel(s3c_hsotg_ep0_mps(hsotg->eps[0].ep.maxpacket) |
+	       S3C_DxEPCTL_CNAK | S3C_DxEPCTL_EPEna |
+	       S3C_DxEPCTL_USBActEp,
+	       hsotg->regs + S3C_DOEPCTL0);
+
+	/* enable, but don't activate EP0in */
+	writel(s3c_hsotg_ep0_mps(hsotg->eps[0].ep.maxpacket) |
+	       S3C_DxEPCTL_USBActEp, hsotg->regs + S3C_DIEPCTL0);
+
+	s3c_hsotg_enqueue_setup(hsotg);
+
+	dev_info(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
+		 readl(hsotg->regs + S3C_DIEPCTL0),
+		 readl(hsotg->regs + S3C_DOEPCTL0));
+
+	/* clear global NAKs */
+	writel(S3C_DCTL_CGOUTNak | S3C_DCTL_CGNPInNAK,
+	       hsotg->regs + S3C_DCTL);
+
+	/* remove the soft-disconnect and let's go */
+	__bic32(hsotg->regs + S3C_DCTL, S3C_DCTL_SftDiscon);
+
+	/* report to the user, and return */
+
+	dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name);
+	return 0;
+
+err:
+	hsotg->driver = NULL;
+	hsotg->gadget.dev.driver = NULL;
+	return ret;
+}
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+	struct s3c_hsotg *hsotg = our_hsotg;
+	int ep;
+
+	if (!hsotg)
+		return -ENODEV;
+
+	if (!driver || driver != hsotg->driver || !driver->unbind)
+		return -EINVAL;
+
+	/* all endpoints should be shutdown */
+	for (ep = 0; ep < S3C_HSOTG_EPS; ep++)
+		s3c_hsotg_ep_disable(&hsotg->eps[ep].ep);
+
+	call_gadget(hsotg, disconnect);
+
+	driver->unbind(&hsotg->gadget);
+	hsotg->driver = NULL;
+	hsotg->gadget.speed = USB_SPEED_UNKNOWN;
+
+	device_del(&hsotg->gadget.dev);
+
+	dev_info(hsotg->dev, "unregistered gadget driver '%s'\n",
+		 driver->driver.name);
+
+	return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+static int s3c_hsotg_gadget_getframe(struct usb_gadget *gadget)
+{
+	return s3c_hsotg_read_frameno(to_hsotg(gadget));
+}
+
+static struct usb_gadget_ops s3c_hsotg_gadget_ops = {
+	.get_frame	= s3c_hsotg_gadget_getframe,
+};
+
+/**
+ * s3c_hsotg_initep - initialise a single endpoint
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint to be initialised.
+ * @epnum: The endpoint number
+ *
+ * Initialise the given endpoint (as part of the probe and device state
+ * creation) to give to the gadget driver. Setup the endpoint name, any
+ * direction information and other state that may be required.
+ */
+static void __devinit s3c_hsotg_initep(struct s3c_hsotg *hsotg,
+				       struct s3c_hsotg_ep *hs_ep,
+				       int epnum)
+{
+	u32 ptxfifo;
+	char *dir;
+
+	if (epnum == 0)
+		dir = "";
+	else if ((epnum % 2) == 0) {
+		dir = "out";
+	} else {
+		dir = "in";
+		hs_ep->dir_in = 1;
+	}
+
+	hs_ep->index = epnum;
+
+	snprintf(hs_ep->name, sizeof(hs_ep->name), "ep%d%s", epnum, dir);
+
+	INIT_LIST_HEAD(&hs_ep->queue);
+	INIT_LIST_HEAD(&hs_ep->ep.ep_list);
+
+	spin_lock_init(&hs_ep->lock);
+
+	/* add to the list of endpoints known by the gadget driver */
+	if (epnum)
+		list_add_tail(&hs_ep->ep.ep_list, &hsotg->gadget.ep_list);
+
+	hs_ep->parent = hsotg;
+	hs_ep->ep.name = hs_ep->name;
+	hs_ep->ep.maxpacket = epnum ? 512 : EP0_MPS_LIMIT;
+	hs_ep->ep.ops = &s3c_hsotg_ep_ops;
+
+	/* Read the FIFO size for the Periodic TX FIFO, even if we're
+	 * an OUT endpoint, we may as well do this if in future the
+	 * code is changed to make each endpoint's direction changeable.
+	 */
+
+	ptxfifo = readl(hsotg->regs + S3C_DPTXFSIZn(epnum));
+	hs_ep->fifo_size = S3C_DPTXFSIZn_DPTxFSize_GET(ptxfifo);
+
+	/* if we're using dma, we need to set the next-endpoint pointer
+	 * to be something valid.
+	 */
+
+	if (using_dma(hsotg)) {
+		u32 next = S3C_DxEPCTL_NextEp((epnum + 1) % 15);
+		writel(next, hsotg->regs + S3C_DIEPCTL(epnum));
+		writel(next, hsotg->regs + S3C_DOEPCTL(epnum));
+	}
+}
+
+/**
+ * s3c_hsotg_otgreset - reset the OtG phy block
+ * @hsotg: The host state.
+ *
+ * Power up the phy, set the basic configuration and start the PHY.
+ */
+static void s3c_hsotg_otgreset(struct s3c_hsotg *hsotg)
+{
+	u32 osc;
+
+	writel(0, S3C_PHYPWR);
+	mdelay(1);
+
+	osc = hsotg->plat->is_osc ? S3C_PHYCLK_EXT_OSC : 0;
+
+	writel(osc | 0x10, S3C_PHYCLK);
+
+	/* issue a full set of resets to the otg and core */
+
+	writel(S3C_RSTCON_PHY, S3C_RSTCON);
+	udelay(20);	/* at-least 10uS */
+	writel(0, S3C_RSTCON);
+}
+
+
+static void s3c_hsotg_init(struct s3c_hsotg *hsotg)
+{
+	/* unmask subset of endpoint interrupts */
+
+	writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk |
+	       S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk,
+	       hsotg->regs + S3C_DIEPMSK);
+
+	writel(S3C_DOEPMSK_SetupMsk | S3C_DOEPMSK_AHBErrMsk |
+	       S3C_DOEPMSK_EPDisbldMsk | S3C_DOEPMSK_XferComplMsk,
+	       hsotg->regs + S3C_DOEPMSK);
+
+	writel(0, hsotg->regs + S3C_DAINTMSK);
+
+	if (0) {
+		/* post global nak until we're ready */
+		writel(S3C_DCTL_SGNPInNAK | S3C_DCTL_SGOUTNak,
+		       hsotg->regs + S3C_DCTL);
+	}
+
+	/* setup fifos */
+
+	dev_info(hsotg->dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n",
+		 readl(hsotg->regs + S3C_GRXFSIZ),
+		 readl(hsotg->regs + S3C_GNPTXFSIZ));
+
+	s3c_hsotg_init_fifo(hsotg);
+
+	/* set the PLL on, remove the HNP/SRP and set the PHY */
+	writel(S3C_GUSBCFG_PHYIf16 | S3C_GUSBCFG_TOutCal(7) | (0x5 << 10),
+	       hsotg->regs + S3C_GUSBCFG);
+
+	writel(using_dma(hsotg) ? S3C_GAHBCFG_DMAEn : 0x0,
+	       hsotg->regs + S3C_GAHBCFG);
+}
+
+static void s3c_hsotg_dump(struct s3c_hsotg *hsotg)
+{
+	struct device *dev = hsotg->dev;
+	void __iomem *regs = hsotg->regs;
+	u32 val;
+	int idx;
+
+	dev_info(dev, "DCFG=0x%08x, DCTL=0x%08x, DIEPMSK=%08x\n",
+		 readl(regs + S3C_DCFG), readl(regs + S3C_DCTL),
+		 readl(regs + S3C_DIEPMSK));
+
+	dev_info(dev, "GAHBCFG=0x%08x, 0x44=0x%08x\n",
+		 readl(regs + S3C_GAHBCFG), readl(regs + 0x44));
+
+	dev_info(dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n",
+		 readl(regs + S3C_GRXFSIZ), readl(regs + S3C_GNPTXFSIZ));
+
+	/* show periodic fifo settings */
+
+	for (idx = 1; idx <= 15; idx++) {
+		val = readl(regs + S3C_DPTXFSIZn(idx));
+		dev_info(dev, "DPTx[%d] FSize=%d, StAddr=0x%08x\n", idx,
+			 val >> S3C_DPTXFSIZn_DPTxFSize_SHIFT,
+			 val & S3C_DPTXFSIZn_DPTxFStAddr_MASK);
+	}
+
+	for (idx = 0; idx < 15; idx++) {
+		dev_info(dev,
+			 "ep%d-in: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", idx,
+			 readl(regs + S3C_DIEPCTL(idx)),
+			 readl(regs + S3C_DIEPTSIZ(idx)),
+			 readl(regs + S3C_DIEPDMA(idx)));
+
+		val = readl(regs + S3C_DOEPCTL(idx));
+		dev_info(dev,
+			 "ep%d-out: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n",
+			 idx, readl(regs + S3C_DOEPCTL(idx)),
+			 readl(regs + S3C_DOEPTSIZ(idx)),
+			 readl(regs + S3C_DOEPDMA(idx)));
+
+	}
+
+	dev_info(dev, "DVBUSDIS=0x%08x, DVBUSPULSE=%08x\n",
+		 readl(regs + S3C_DVBUSDIS), readl(regs + S3C_DVBUSPULSE));
+}
+
+
+/**
+ * state_show - debugfs: show overall driver and device state.
+ * @seq: The seq file to write to.
+ * @v: Unused parameter.
+ *
+ * This debugfs entry shows the overall state of the hardware and
+ * some general information about each of the endpoints available
+ * to the system.
+ */
+static int state_show(struct seq_file *seq, void *v)
+{
+	struct s3c_hsotg *hsotg = seq->private;
+	void __iomem *regs = hsotg->regs;
+	int idx;
+
+	seq_printf(seq, "DCFG=0x%08x, DCTL=0x%08x, DSTS=0x%08x\n",
+		 readl(regs + S3C_DCFG),
+		 readl(regs + S3C_DCTL),
+		 readl(regs + S3C_DSTS));
+
+	seq_printf(seq, "DIEPMSK=0x%08x, DOEPMASK=0x%08x\n",
+		   readl(regs + S3C_DIEPMSK), readl(regs + S3C_DOEPMSK));
+
+	seq_printf(seq, "GINTMSK=0x%08x, GINTSTS=0x%08x\n",
+		   readl(regs + S3C_GINTMSK),
+		   readl(regs + S3C_GINTSTS));
+
+	seq_printf(seq, "DAINTMSK=0x%08x, DAINT=0x%08x\n",
+		   readl(regs + S3C_DAINTMSK),
+		   readl(regs + S3C_DAINT));
+
+	seq_printf(seq, "GNPTXSTS=0x%08x, GRXSTSR=%08x\n",
+		   readl(regs + S3C_GNPTXSTS),
+		   readl(regs + S3C_GRXSTSR));
+
+	seq_printf(seq, "\nEndpoint status:\n");
+
+	for (idx = 0; idx < 15; idx++) {
+		u32 in, out;
+
+		in = readl(regs + S3C_DIEPCTL(idx));
+		out = readl(regs + S3C_DOEPCTL(idx));
+
+		seq_printf(seq, "ep%d: DIEPCTL=0x%08x, DOEPCTL=0x%08x",
+			   idx, in, out);
+
+		in = readl(regs + S3C_DIEPTSIZ(idx));
+		out = readl(regs + S3C_DOEPTSIZ(idx));
+
+		seq_printf(seq, ", DIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x",
+			   in, out);
+
+		seq_printf(seq, "\n");
+	}
+
+	return 0;
+}
+
+static int state_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, state_show, inode->i_private);
+}
+
+static const struct file_operations state_fops = {
+	.owner		= THIS_MODULE,
+	.open		= state_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+/**
+ * fifo_show - debugfs: show the fifo information
+ * @seq: The seq_file to write data to.
+ * @v: Unused parameter.
+ *
+ * Show the FIFO information for the overall fifo and all the
+ * periodic transmission FIFOs.
+*/
+static int fifo_show(struct seq_file *seq, void *v)
+{
+	struct s3c_hsotg *hsotg = seq->private;
+	void __iomem *regs = hsotg->regs;
+	u32 val;
+	int idx;
+
+	seq_printf(seq, "Non-periodic FIFOs:\n");
+	seq_printf(seq, "RXFIFO: Size %d\n", readl(regs + S3C_GRXFSIZ));
+
+	val = readl(regs + S3C_GNPTXFSIZ);
+	seq_printf(seq, "NPTXFIFO: Size %d, Start 0x%08x\n",
+		   val >> S3C_GNPTXFSIZ_NPTxFDep_SHIFT,
+		   val & S3C_GNPTXFSIZ_NPTxFStAddr_MASK);
+
+	seq_printf(seq, "\nPeriodic TXFIFOs:\n");
+
+	for (idx = 1; idx <= 15; idx++) {
+		val = readl(regs + S3C_DPTXFSIZn(idx));
+
+		seq_printf(seq, "\tDPTXFIFO%2d: Size %d, Start 0x%08x\n", idx,
+			   val >> S3C_DPTXFSIZn_DPTxFSize_SHIFT,
+			   val & S3C_DPTXFSIZn_DPTxFStAddr_MASK);
+	}
+
+	return 0;
+}
+
+static int fifo_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, fifo_show, inode->i_private);
+}
+
+static const struct file_operations fifo_fops = {
+	.owner		= THIS_MODULE,
+	.open		= fifo_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+
+static const char *decode_direction(int is_in)
+{
+	return is_in ? "in" : "out";
+}
+
+/**
+ * ep_show - debugfs: show the state of an endpoint.
+ * @seq: The seq_file to write data to.
+ * @v: Unused parameter.
+ *
+ * This debugfs entry shows the state of the given endpoint (one is
+ * registered for each available).
+*/
+static int ep_show(struct seq_file *seq, void *v)
+{
+	struct s3c_hsotg_ep *ep = seq->private;
+	struct s3c_hsotg *hsotg = ep->parent;
+	struct s3c_hsotg_req *req;
+	void __iomem *regs = hsotg->regs;
+	int index = ep->index;
+	int show_limit = 15;
+	unsigned long flags;
+
+	seq_printf(seq, "Endpoint index %d, named %s,  dir %s:\n",
+		   ep->index, ep->ep.name, decode_direction(ep->dir_in));
+
+	/* first show the register state */
+
+	seq_printf(seq, "\tDIEPCTL=0x%08x, DOEPCTL=0x%08x\n",
+		   readl(regs + S3C_DIEPCTL(index)),
+		   readl(regs + S3C_DOEPCTL(index)));
+
+	seq_printf(seq, "\tDIEPDMA=0x%08x, DOEPDMA=0x%08x\n",
+		   readl(regs + S3C_DIEPDMA(index)),
+		   readl(regs + S3C_DOEPDMA(index)));
+
+	seq_printf(seq, "\tDIEPINT=0x%08x, DOEPINT=0x%08x\n",
+		   readl(regs + S3C_DIEPINT(index)),
+		   readl(regs + S3C_DOEPINT(index)));
+
+	seq_printf(seq, "\tDIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x\n",
+		   readl(regs + S3C_DIEPTSIZ(index)),
+		   readl(regs + S3C_DOEPTSIZ(index)));
+
+	seq_printf(seq, "\n");
+	seq_printf(seq, "mps %d\n", ep->ep.maxpacket);
+	seq_printf(seq, "total_data=%ld\n", ep->total_data);
+
+	seq_printf(seq, "request list (%p,%p):\n",
+		   ep->queue.next, ep->queue.prev);
+
+	spin_lock_irqsave(&ep->lock, flags);
+
+	list_for_each_entry(req, &ep->queue, queue) {
+		if (--show_limit < 0) {
+			seq_printf(seq, "not showing more requests...\n");
+			break;
+		}
+
+		seq_printf(seq, "%c req %p: %d bytes @%p, ",
+			   req == ep->req ? '*' : ' ',
+			   req, req->req.length, req->req.buf);
+		seq_printf(seq, "%d done, res %d\n",
+			   req->req.actual, req->req.status);
+	}
+
+	spin_unlock_irqrestore(&ep->lock, flags);
+
+	return 0;
+}
+
+static int ep_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ep_show, inode->i_private);
+}
+
+static const struct file_operations ep_fops = {
+	.owner		= THIS_MODULE,
+	.open		= ep_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+/**
+ * s3c_hsotg_create_debug - create debugfs directory and files
+ * @hsotg: The driver state
+ *
+ * Create the debugfs files to allow the user to get information
+ * about the state of the system. The directory name is created
+ * with the same name as the device itself, in case we end up
+ * with multiple blocks in future systems.
+*/
+static void __devinit s3c_hsotg_create_debug(struct s3c_hsotg *hsotg)
+{
+	struct dentry *root;
+	unsigned epidx;
+
+	root = debugfs_create_dir(dev_name(hsotg->dev), NULL);
+	hsotg->debug_root = root;
+	if (IS_ERR(root)) {
+		dev_err(hsotg->dev, "cannot create debug root\n");
+		return;
+	}
+
+	/* create general state file */
+
+	hsotg->debug_file = debugfs_create_file("state", 0444, root,
+						hsotg, &state_fops);
+
+	if (IS_ERR(hsotg->debug_file))
+		dev_err(hsotg->dev, "%s: failed to create state\n", __func__);
+
+	hsotg->debug_fifo = debugfs_create_file("fifo", 0444, root,
+						hsotg, &fifo_fops);
+
+	if (IS_ERR(hsotg->debug_fifo))
+		dev_err(hsotg->dev, "%s: failed to create fifo\n", __func__);
+
+	/* create one file for each endpoint */
+
+	for (epidx = 0; epidx < S3C_HSOTG_EPS; epidx++) {
+		struct s3c_hsotg_ep *ep = &hsotg->eps[epidx];
+
+		ep->debugfs = debugfs_create_file(ep->name, 0444,
+						  root, ep, &ep_fops);
+
+		if (IS_ERR(ep->debugfs))
+			dev_err(hsotg->dev, "failed to create %s debug file\n",
+				ep->name);
+	}
+}
+
+/**
+ * s3c_hsotg_delete_debug - cleanup debugfs entries
+ * @hsotg: The driver state
+ *
+ * Cleanup (remove) the debugfs files for use on module exit.
+*/
+static void __devexit s3c_hsotg_delete_debug(struct s3c_hsotg *hsotg)
+{
+	unsigned epidx;
+
+	for (epidx = 0; epidx < S3C_HSOTG_EPS; epidx++) {
+		struct s3c_hsotg_ep *ep = &hsotg->eps[epidx];
+		debugfs_remove(ep->debugfs);
+	}
+
+	debugfs_remove(hsotg->debug_file);
+	debugfs_remove(hsotg->debug_fifo);
+	debugfs_remove(hsotg->debug_root);
+}
+
+/**
+ * s3c_hsotg_gate - set the hardware gate for the block
+ * @pdev: The device we bound to
+ * @on: On or off.
+ *
+ * Set the hardware gate setting into the block. If we end up on
+ * something other than an S3C64XX, then we might need to change this
+ * to using a platform data callback, or some other mechanism.
+ */
+static void s3c_hsotg_gate(struct platform_device *pdev, bool on)
+{
+	unsigned long flags;
+	u32 others;
+
+	local_irq_save(flags);
+
+	others = __raw_readl(S3C64XX_OTHERS);
+	if (on)
+		others |= S3C64XX_OTHERS_USBMASK;
+	else
+		others &= ~S3C64XX_OTHERS_USBMASK;
+	__raw_writel(others, S3C64XX_OTHERS);
+
+	local_irq_restore(flags);
+}
+
+struct s3c_hsotg_plat s3c_hsotg_default_pdata;
+
+static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
+{
+	struct s3c_hsotg_plat *plat = pdev->dev.platform_data;
+	struct device *dev = &pdev->dev;
+	struct s3c_hsotg *hsotg;
+	struct resource *res;
+	int epnum;
+	int ret;
+
+	if (!plat)
+		plat = &s3c_hsotg_default_pdata;
+
+	hsotg = kzalloc(sizeof(struct s3c_hsotg) +
+			sizeof(struct s3c_hsotg_ep) * S3C_HSOTG_EPS,
+			GFP_KERNEL);
+	if (!hsotg) {
+		dev_err(dev, "cannot get memory\n");
+		return -ENOMEM;
+	}
+
+	hsotg->dev = dev;
+	hsotg->plat = plat;
+
+	platform_set_drvdata(pdev, hsotg);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "cannot find register resource 0\n");
+		ret = -EINVAL;
+		goto err_mem;
+	}
+
+	hsotg->regs_res = request_mem_region(res->start, resource_size(res),
+					     dev_name(dev));
+	if (!hsotg->regs_res) {
+		dev_err(dev, "cannot reserve registers\n");
+		ret = -ENOENT;
+		goto err_mem;
+	}
+
+	hsotg->regs = ioremap(res->start, resource_size(res));
+	if (!hsotg->regs) {
+		dev_err(dev, "cannot map registers\n");
+		ret = -ENXIO;
+		goto err_regs_res;
+	}
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0) {
+		dev_err(dev, "cannot find IRQ\n");
+		goto err_regs;
+	}
+
+	hsotg->irq = ret;
+
+	ret = request_irq(ret, s3c_hsotg_irq, 0, dev_name(dev), hsotg);
+	if (ret < 0) {
+		dev_err(dev, "cannot claim IRQ\n");
+		goto err_regs;
+	}
+
+	dev_info(dev, "regs %p, irq %d\n", hsotg->regs, hsotg->irq);
+
+	device_initialize(&hsotg->gadget.dev);
+
+	dev_set_name(&hsotg->gadget.dev, "gadget");
+
+	hsotg->gadget.is_dualspeed = 1;
+	hsotg->gadget.ops = &s3c_hsotg_gadget_ops;
+	hsotg->gadget.name = dev_name(dev);
+
+	hsotg->gadget.dev.parent = dev;
+	hsotg->gadget.dev.dma_mask = dev->dma_mask;
+
+	/* setup endpoint information */
+
+	INIT_LIST_HEAD(&hsotg->gadget.ep_list);
+	hsotg->gadget.ep0 = &hsotg->eps[0].ep;
+
+	/* allocate EP0 request */
+
+	hsotg->ctrl_req = s3c_hsotg_ep_alloc_request(&hsotg->eps[0].ep,
+						     GFP_KERNEL);
+	if (!hsotg->ctrl_req) {
+		dev_err(dev, "failed to allocate ctrl req\n");
+		goto err_regs;
+	}
+
+	/* reset the system */
+
+	s3c_hsotg_gate(pdev, true);
+
+	s3c_hsotg_otgreset(hsotg);
+	s3c_hsotg_corereset(hsotg);
+	s3c_hsotg_init(hsotg);
+
+	/* initialise the endpoints now the core has been initialised */
+	for (epnum = 0; epnum < S3C_HSOTG_EPS; epnum++)
+		s3c_hsotg_initep(hsotg, &hsotg->eps[epnum], epnum);
+
+	s3c_hsotg_create_debug(hsotg);
+
+	s3c_hsotg_dump(hsotg);
+
+	our_hsotg = hsotg;
+	return 0;
+
+err_regs:
+	iounmap(hsotg->regs);
+
+err_regs_res:
+	release_resource(hsotg->regs_res);
+	kfree(hsotg->regs_res);
+
+err_mem:
+	kfree(hsotg);
+	return ret;
+}
+
+static int __devexit s3c_hsotg_remove(struct platform_device *pdev)
+{
+	struct s3c_hsotg *hsotg = platform_get_drvdata(pdev);
+
+	s3c_hsotg_delete_debug(hsotg);
+
+	usb_gadget_unregister_driver(hsotg->driver);
+
+	free_irq(hsotg->irq, hsotg);
+	iounmap(hsotg->regs);
+
+	release_resource(hsotg->regs_res);
+	kfree(hsotg->regs_res);
+
+	s3c_hsotg_gate(pdev, false);
+
+	kfree(hsotg);
+	return 0;
+}
+
+#if 1
+#define s3c_hsotg_suspend NULL
+#define s3c_hsotg_resume NULL
+#endif
+
+static struct platform_driver s3c_hsotg_driver = {
+	.driver		= {
+		.name	= "s3c-hsotg",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= s3c_hsotg_probe,
+	.remove		= __devexit_p(s3c_hsotg_remove),
+	.suspend	= s3c_hsotg_suspend,
+	.resume		= s3c_hsotg_resume,
+};
+
+static int __init s3c_hsotg_modinit(void)
+{
+	return platform_driver_register(&s3c_hsotg_driver);
+}
+
+static void __exit s3c_hsotg_modexit(void)
+{
+	platform_driver_unregister(&s3c_hsotg_driver);
+}
+
+module_init(s3c_hsotg_modinit);
+module_exit(s3c_hsotg_modexit);
+
+MODULE_DESCRIPTION("Samsung S3C USB High-speed/OtG device");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s3c-hsotg");
diff --git a/drivers/usb/gadget/u_audio.c b/drivers/usb/gadget/u_audio.c
new file mode 100644
index 000000000000..0f3d22fc030e
--- /dev/null
+++ b/drivers/usb/gadget/u_audio.c
@@ -0,0 +1,319 @@
+/*
+ * u_audio.c -- ALSA audio utilities for Gadget stack
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/utsname.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/ctype.h>
+#include <linux/random.h>
+#include <linux/syscalls.h>
+
+#include "u_audio.h"
+
+/*
+ * This component encapsulates the ALSA devices for USB audio gadget
+ */
+
+#define FILE_PCM_PLAYBACK	"/dev/snd/pcmC0D0p"
+#define FILE_PCM_CAPTURE	"/dev/snd/pcmC0D0c"
+#define FILE_CONTROL		"/dev/snd/controlC0"
+
+static char *fn_play = FILE_PCM_PLAYBACK;
+module_param(fn_play, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
+
+static char *fn_cap = FILE_PCM_CAPTURE;
+module_param(fn_cap, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
+
+static char *fn_cntl = FILE_CONTROL;
+module_param(fn_cntl, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_cntl, "Control device file name");
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * Some ALSA internal helper functions
+ */
+static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
+{
+	struct snd_interval t;
+	t.empty = 0;
+	t.min = t.max = val;
+	t.openmin = t.openmax = 0;
+	t.integer = 1;
+	return snd_interval_refine(i, &t);
+}
+
+static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
+				 snd_pcm_hw_param_t var, unsigned int val,
+				 int dir)
+{
+	int changed;
+	if (hw_is_mask(var)) {
+		struct snd_mask *m = hw_param_mask(params, var);
+		if (val == 0 && dir < 0) {
+			changed = -EINVAL;
+			snd_mask_none(m);
+		} else {
+			if (dir > 0)
+				val++;
+			else if (dir < 0)
+				val--;
+			changed = snd_mask_refine_set(
+					hw_param_mask(params, var), val);
+		}
+	} else if (hw_is_interval(var)) {
+		struct snd_interval *i = hw_param_interval(params, var);
+		if (val == 0 && dir < 0) {
+			changed = -EINVAL;
+			snd_interval_none(i);
+		} else if (dir == 0)
+			changed = snd_interval_refine_set(i, val);
+		else {
+			struct snd_interval t;
+			t.openmin = 1;
+			t.openmax = 1;
+			t.empty = 0;
+			t.integer = 0;
+			if (dir < 0) {
+				t.min = val - 1;
+				t.max = val;
+			} else {
+				t.min = val;
+				t.max = val+1;
+			}
+			changed = snd_interval_refine(i, &t);
+		}
+	} else
+		return -EINVAL;
+	if (changed) {
+		params->cmask |= 1 << var;
+		params->rmask |= 1 << var;
+	}
+	return changed;
+}
+/*-------------------------------------------------------------------------*/
+
+/**
+ * Set default hardware params
+ */
+static int playback_default_hw_params(struct gaudio_snd_dev *snd)
+{
+	struct snd_pcm_substream *substream = snd->substream;
+	struct snd_pcm_hw_params *params;
+	snd_pcm_sframes_t result;
+
+       /*
+	* SNDRV_PCM_ACCESS_RW_INTERLEAVED,
+	* SNDRV_PCM_FORMAT_S16_LE
+	* CHANNELS: 2
+	* RATE: 48000
+	*/
+	snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
+	snd->format = SNDRV_PCM_FORMAT_S16_LE;
+	snd->channels = 2;
+	snd->rate = 48000;
+
+	params = kzalloc(sizeof(*params), GFP_KERNEL);
+	if (!params)
+		return -ENOMEM;
+
+	_snd_pcm_hw_params_any(params);
+	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
+			snd->access, 0);
+	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
+			snd->format, 0);
+	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
+			snd->channels, 0);
+	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
+			snd->rate, 0);
+
+	snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
+	snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, params);
+
+	result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
+	if (result < 0) {
+		ERROR(snd->card,
+			"Preparing sound card failed: %d\n", (int)result);
+		kfree(params);
+		return result;
+	}
+
+	/* Store the hardware parameters */
+	snd->access = params_access(params);
+	snd->format = params_format(params);
+	snd->channels = params_channels(params);
+	snd->rate = params_rate(params);
+
+	kfree(params);
+
+	INFO(snd->card,
+		"Hardware params: access %x, format %x, channels %d, rate %d\n",
+		snd->access, snd->format, snd->channels, snd->rate);
+
+	return 0;
+}
+
+/**
+ * Playback audio buffer data by ALSA PCM device
+ */
+static size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
+{
+	struct gaudio_snd_dev	*snd = &card->playback;
+	struct snd_pcm_substream *substream = snd->substream;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	mm_segment_t old_fs;
+	ssize_t result;
+	snd_pcm_sframes_t frames;
+
+try_again:
+	if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
+		runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
+		result = snd_pcm_kernel_ioctl(substream,
+				SNDRV_PCM_IOCTL_PREPARE, NULL);
+		if (result < 0) {
+			ERROR(card, "Preparing sound card failed: %d\n",
+					(int)result);
+			return result;
+		}
+	}
+
+	frames = bytes_to_frames(runtime, count);
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	result = snd_pcm_lib_write(snd->substream, buf, frames);
+	if (result != frames) {
+		ERROR(card, "Playback error: %d\n", (int)result);
+		set_fs(old_fs);
+		goto try_again;
+	}
+	set_fs(old_fs);
+
+	return 0;
+}
+
+static int u_audio_get_playback_channels(struct gaudio *card)
+{
+	return card->playback.channels;
+}
+
+static int u_audio_get_playback_rate(struct gaudio *card)
+{
+	return card->playback.rate;
+}
+
+/**
+ * Open ALSA PCM and control device files
+ * Initial the PCM or control device
+ */
+static int gaudio_open_snd_dev(struct gaudio *card)
+{
+	struct snd_pcm_file *pcm_file;
+	struct gaudio_snd_dev *snd;
+
+	if (!card)
+		return -ENODEV;
+
+	/* Open control device */
+	snd = &card->control;
+	snd->filp = filp_open(fn_cntl, O_RDWR, 0);
+	if (IS_ERR(snd->filp)) {
+		int ret = PTR_ERR(snd->filp);
+		ERROR(card, "unable to open sound control device file: %s\n",
+				fn_cntl);
+		snd->filp = NULL;
+		return ret;
+	}
+	snd->card = card;
+
+	/* Open PCM playback device and setup substream */
+	snd = &card->playback;
+	snd->filp = filp_open(fn_play, O_WRONLY, 0);
+	if (IS_ERR(snd->filp)) {
+		ERROR(card, "No such PCM playback device: %s\n", fn_play);
+		snd->filp = NULL;
+	}
+	pcm_file = snd->filp->private_data;
+	snd->substream = pcm_file->substream;
+	snd->card = card;
+	playback_default_hw_params(snd);
+
+	/* Open PCM capture device and setup substream */
+	snd = &card->capture;
+	snd->filp = filp_open(fn_cap, O_RDONLY, 0);
+	if (IS_ERR(snd->filp)) {
+		ERROR(card, "No such PCM capture device: %s\n", fn_cap);
+		snd->filp = NULL;
+	}
+	pcm_file = snd->filp->private_data;
+	snd->substream = pcm_file->substream;
+	snd->card = card;
+
+	return 0;
+}
+
+/**
+ * Close ALSA PCM and control device files
+ */
+static int gaudio_close_snd_dev(struct gaudio *gau)
+{
+	struct gaudio_snd_dev	*snd;
+
+	/* Close control device */
+	snd = &gau->control;
+	if (!IS_ERR(snd->filp))
+		filp_close(snd->filp, current->files);
+
+	/* Close PCM playback device and setup substream */
+	snd = &gau->playback;
+	if (!IS_ERR(snd->filp))
+		filp_close(snd->filp, current->files);
+
+	/* Close PCM capture device and setup substream */
+	snd = &gau->capture;
+	if (!IS_ERR(snd->filp))
+		filp_close(snd->filp, current->files);
+
+	return 0;
+}
+
+/**
+ * gaudio_setup - setup ALSA interface and preparing for USB transfer
+ *
+ * This sets up PCM, mixer or MIDI ALSA devices fore USB gadget using.
+ *
+ * Returns negative errno, or zero on success
+ */
+int __init gaudio_setup(struct gaudio *card)
+{
+	int	ret;
+
+	ret = gaudio_open_snd_dev(card);
+	if (ret)
+		ERROR(card, "we need at least one control device\n");
+
+	return ret;
+
+}
+
+/**
+ * gaudio_cleanup - remove ALSA device interface
+ *
+ * This is called to free all resources allocated by @gaudio_setup().
+ */
+void gaudio_cleanup(struct gaudio *card)
+{
+	if (card)
+		gaudio_close_snd_dev(card);
+}
+
diff --git a/drivers/usb/gadget/u_audio.h b/drivers/usb/gadget/u_audio.h
new file mode 100644
index 000000000000..cc8d159c648a
--- /dev/null
+++ b/drivers/usb/gadget/u_audio.h
@@ -0,0 +1,56 @@
+/*
+ * u_audio.h -- interface to USB gadget "ALSA AUDIO" utilities
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __U_AUDIO_H
+#define __U_AUDIO_H
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/usb/audio.h>
+#include <linux/usb/composite.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "gadget_chips.h"
+
+/*
+ * This represents the USB side of an audio card device, managed by a USB
+ * function which provides control and stream interfaces.
+ */
+
+struct gaudio_snd_dev {
+	struct gaudio			*card;
+	struct file			*filp;
+	struct snd_pcm_substream	*substream;
+	int				access;
+	int				format;
+	int				channels;
+	int				rate;
+};
+
+struct gaudio {
+	struct usb_function		func;
+	struct usb_gadget		*gadget;
+
+	/* ALSA sound device interfaces */
+	struct gaudio_snd_dev		control;
+	struct gaudio_snd_dev		playback;
+	struct gaudio_snd_dev		capture;
+
+	/* TODO */
+};
+
+int gaudio_setup(struct gaudio *card);
+void gaudio_cleanup(struct gaudio *card);
+
+#endif /* __U_AUDIO_H */
diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index 0a4d99ab40d8..fc6e709f45b1 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -371,6 +371,7 @@ __acquires(&port->port_lock)
 
 		req->length = len;
 		list_del(&req->list);
+		req->zero = (gs_buf_data_avail(&port->port_write_buf) == 0);
 
 		pr_vdebug(PREFIX "%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",
 				port->port_num, len, *((u8 *)req->buf),