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path: root/drivers/usb/phy/ulpi.c
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Diffstat (limited to 'drivers/usb/phy/ulpi.c')
-rw-r--r--drivers/usb/phy/ulpi.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/drivers/usb/phy/ulpi.c b/drivers/usb/phy/ulpi.c
new file mode 100644
index 000000000000..217339dd7a90
--- /dev/null
+++ b/drivers/usb/phy/ulpi.c
@@ -0,0 +1,283 @@
+/*
+ * Generic ULPI USB transceiver support
+ *
+ * Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ * Based on sources from
+ *
+ * Sascha Hauer <s.hauer@pengutronix.de>
+ * Freescale Semiconductors
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/ulpi.h>
+
+
+struct ulpi_info {
+ unsigned int id;
+ char *name;
+};
+
+#define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
+#define ULPI_INFO(_id, _name) \
+ { \
+ .id = (_id), \
+ .name = (_name), \
+ }
+
+/* ULPI hardcoded IDs, used for probing */
+static struct ulpi_info ulpi_ids[] = {
+ ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"),
+ ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB331x"),
+};
+
+static int ulpi_set_otg_flags(struct usb_phy *phy)
+{
+ unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN |
+ ULPI_OTG_CTRL_DM_PULLDOWN;
+
+ if (phy->flags & ULPI_OTG_ID_PULLUP)
+ flags |= ULPI_OTG_CTRL_ID_PULLUP;
+
+ /*
+ * ULPI Specification rev.1.1 default
+ * for Dp/DmPulldown is enabled.
+ */
+ if (phy->flags & ULPI_OTG_DP_PULLDOWN_DIS)
+ flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN;
+
+ if (phy->flags & ULPI_OTG_DM_PULLDOWN_DIS)
+ flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN;
+
+ if (phy->flags & ULPI_OTG_EXTVBUSIND)
+ flags |= ULPI_OTG_CTRL_EXTVBUSIND;
+
+ return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
+}
+
+static int ulpi_set_fc_flags(struct usb_phy *phy)
+{
+ unsigned int flags = 0;
+
+ /*
+ * ULPI Specification rev.1.1 default
+ * for XcvrSelect is Full Speed.
+ */
+ if (phy->flags & ULPI_FC_HS)
+ flags |= ULPI_FUNC_CTRL_HIGH_SPEED;
+ else if (phy->flags & ULPI_FC_LS)
+ flags |= ULPI_FUNC_CTRL_LOW_SPEED;
+ else if (phy->flags & ULPI_FC_FS4LS)
+ flags |= ULPI_FUNC_CTRL_FS4LS;
+ else
+ flags |= ULPI_FUNC_CTRL_FULL_SPEED;
+
+ if (phy->flags & ULPI_FC_TERMSEL)
+ flags |= ULPI_FUNC_CTRL_TERMSELECT;
+
+ /*
+ * ULPI Specification rev.1.1 default
+ * for OpMode is Normal Operation.
+ */
+ if (phy->flags & ULPI_FC_OP_NODRV)
+ flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
+ else if (phy->flags & ULPI_FC_OP_DIS_NRZI)
+ flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI;
+ else if (phy->flags & ULPI_FC_OP_NSYNC_NEOP)
+ flags |= ULPI_FUNC_CTRL_OPMODE_NOSYNC_NOEOP;
+ else
+ flags |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
+
+ /*
+ * ULPI Specification rev.1.1 default
+ * for SuspendM is Powered.
+ */
+ flags |= ULPI_FUNC_CTRL_SUSPENDM;
+
+ return usb_phy_io_write(phy, flags, ULPI_FUNC_CTRL);
+}
+
+static int ulpi_set_ic_flags(struct usb_phy *phy)
+{
+ unsigned int flags = 0;
+
+ if (phy->flags & ULPI_IC_AUTORESUME)
+ flags |= ULPI_IFC_CTRL_AUTORESUME;
+
+ if (phy->flags & ULPI_IC_EXTVBUS_INDINV)
+ flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS;
+
+ if (phy->flags & ULPI_IC_IND_PASSTHRU)
+ flags |= ULPI_IFC_CTRL_PASSTHRU;
+
+ if (phy->flags & ULPI_IC_PROTECT_DIS)
+ flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE;
+
+ return usb_phy_io_write(phy, flags, ULPI_IFC_CTRL);
+}
+
+static int ulpi_set_flags(struct usb_phy *phy)
+{
+ int ret;
+
+ ret = ulpi_set_otg_flags(phy);
+ if (ret)
+ return ret;
+
+ ret = ulpi_set_ic_flags(phy);
+ if (ret)
+ return ret;
+
+ return ulpi_set_fc_flags(phy);
+}
+
+static int ulpi_check_integrity(struct usb_phy *phy)
+{
+ int ret, i;
+ unsigned int val = 0x55;
+
+ for (i = 0; i < 2; i++) {
+ ret = usb_phy_io_write(phy, val, ULPI_SCRATCH);
+ if (ret < 0)
+ return ret;
+
+ ret = usb_phy_io_read(phy, ULPI_SCRATCH);
+ if (ret < 0)
+ return ret;
+
+ if (ret != val) {
+ pr_err("ULPI integrity check: failed!");
+ return -ENODEV;
+ }
+ val = val << 1;
+ }
+
+ pr_info("ULPI integrity check: passed.\n");
+
+ return 0;
+}
+
+static int ulpi_init(struct usb_phy *phy)
+{
+ int i, vid, pid, ret;
+ u32 ulpi_id = 0;
+
+ for (i = 0; i < 4; i++) {
+ ret = usb_phy_io_read(phy, ULPI_PRODUCT_ID_HIGH - i);
+ if (ret < 0)
+ return ret;
+ ulpi_id = (ulpi_id << 8) | ret;
+ }
+ vid = ulpi_id & 0xffff;
+ pid = ulpi_id >> 16;
+
+ pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid);
+
+ for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) {
+ if (ulpi_ids[i].id == ULPI_ID(vid, pid)) {
+ pr_info("Found %s ULPI transceiver.\n",
+ ulpi_ids[i].name);
+ break;
+ }
+ }
+
+ ret = ulpi_check_integrity(phy);
+ if (ret)
+ return ret;
+
+ return ulpi_set_flags(phy);
+}
+
+static int ulpi_set_host(struct usb_otg *otg, struct usb_bus *host)
+{
+ struct usb_phy *phy = otg->phy;
+ unsigned int flags = usb_phy_io_read(phy, ULPI_IFC_CTRL);
+
+ if (!host) {
+ otg->host = NULL;
+ return 0;
+ }
+
+ otg->host = host;
+
+ flags &= ~(ULPI_IFC_CTRL_6_PIN_SERIAL_MODE |
+ ULPI_IFC_CTRL_3_PIN_SERIAL_MODE |
+ ULPI_IFC_CTRL_CARKITMODE);
+
+ if (phy->flags & ULPI_IC_6PIN_SERIAL)
+ flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE;
+ else if (phy->flags & ULPI_IC_3PIN_SERIAL)
+ flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE;
+ else if (phy->flags & ULPI_IC_CARKIT)
+ flags |= ULPI_IFC_CTRL_CARKITMODE;
+
+ return usb_phy_io_write(phy, flags, ULPI_IFC_CTRL);
+}
+
+static int ulpi_set_vbus(struct usb_otg *otg, bool on)
+{
+ struct usb_phy *phy = otg->phy;
+ unsigned int flags = usb_phy_io_read(phy, ULPI_OTG_CTRL);
+
+ flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT);
+
+ if (on) {
+ if (phy->flags & ULPI_OTG_DRVVBUS)
+ flags |= ULPI_OTG_CTRL_DRVVBUS;
+
+ if (phy->flags & ULPI_OTG_DRVVBUS_EXT)
+ flags |= ULPI_OTG_CTRL_DRVVBUS_EXT;
+ }
+
+ return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
+}
+
+struct usb_phy *
+otg_ulpi_create(struct usb_phy_io_ops *ops,
+ unsigned int flags)
+{
+ struct usb_phy *phy;
+ struct usb_otg *otg;
+
+ phy = kzalloc(sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return NULL;
+
+ otg = kzalloc(sizeof(*otg), GFP_KERNEL);
+ if (!otg) {
+ kfree(phy);
+ return NULL;
+ }
+
+ phy->label = "ULPI";
+ phy->flags = flags;
+ phy->io_ops = ops;
+ phy->otg = otg;
+ phy->init = ulpi_init;
+
+ otg->phy = phy;
+ otg->set_host = ulpi_set_host;
+ otg->set_vbus = ulpi_set_vbus;
+
+ return phy;
+}
+EXPORT_SYMBOL_GPL(otg_ulpi_create);
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 16:34:23 +0000