Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 488 insertions, 0 deletions

diff --git a/drivers/usb/storage/freecom.c b/drivers/usb/storage/freecom.c
new file mode 100644
index 000000000000..30e96050fe0c
--- /dev/null
+++ b/drivers/usb/storage/freecom.c
@@ -0,0 +1,488 @@
+/* Driver for Freecom USB/IDE adaptor
+ *
+ * $Id: freecom.c,v 1.22 2002/04/22 03:39:43 mdharm Exp $
+ *
+ * Freecom v0.1:
+ *
+ * First release
+ *
+ * Current development and maintenance by:
+ *   (C) 2000 David Brown <usb-storage@davidb.org>
+ *
+ * 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, 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.
+ *
+ * This driver was developed with information provided in FREECOM's USB
+ * Programmers Reference Guide.  For further information contact Freecom
+ * (http://www.freecom.de/)
+ */
+
+#include <linux/config.h>
+#include <linux/hdreg.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include "usb.h"
+#include "transport.h"
+#include "protocol.h"
+#include "debug.h"
+#include "freecom.h"
+
+#ifdef CONFIG_USB_STORAGE_DEBUG
+static void pdump (void *, int);
+#endif
+
+/* Bits of HD_STATUS */
+#define ERR_STAT		0x01
+#define DRQ_STAT		0x08
+
+/* All of the outgoing packets are 64 bytes long. */
+struct freecom_cb_wrap {
+	u8    Type;		/* Command type. */
+	u8    Timeout;		/* Timeout in seconds. */
+	u8    Atapi[12];	/* An ATAPI packet. */
+	u8    Filler[50];	/* Padding Data. */
+};
+
+struct freecom_xfer_wrap {
+	u8    Type;		/* Command type. */
+	u8    Timeout;		/* Timeout in seconds. */
+	__le32   Count;		/* Number of bytes to transfer. */
+	u8    Pad[58];
+} __attribute__ ((packed));
+
+struct freecom_ide_out {
+	u8    Type;		/* Type + IDE register. */
+	u8    Pad;
+	__le16   Value;		/* Value to write. */
+	u8    Pad2[60];
+};
+
+struct freecom_ide_in {
+	u8    Type;		/* Type | IDE register. */
+	u8    Pad[63];
+};
+
+struct freecom_status {
+	u8    Status;
+	u8    Reason;
+	__le16   Count;
+	u8    Pad[60];
+};
+
+/* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide
+ * register. */
+#define FCM_INT_STATUS		0x02 /* INDEX_STAT */
+#define FCM_STATUS_BUSY		0x80
+
+/* These are the packet types.  The low bit indicates that this command
+ * should wait for an interrupt. */
+#define FCM_PACKET_ATAPI	0x21
+#define FCM_PACKET_STATUS	0x20
+
+/* Receive data from the IDE interface.  The ATAPI packet has already
+ * waited, so the data should be immediately available. */
+#define FCM_PACKET_INPUT	0x81
+
+/* Send data to the IDE interface. */
+#define FCM_PACKET_OUTPUT	0x01
+
+/* Write a value to an ide register.  Or the ide register to write after
+ * munging the address a bit. */
+#define FCM_PACKET_IDE_WRITE	0x40
+#define FCM_PACKET_IDE_READ	0xC0
+
+/* All packets (except for status) are 64 bytes long. */
+#define FCM_PACKET_LENGTH		64
+#define FCM_STATUS_PACKET_LENGTH	4
+
+static int
+freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
+		unsigned int ipipe, unsigned int opipe, int count)
+{
+	struct freecom_xfer_wrap *fxfr =
+		(struct freecom_xfer_wrap *) us->iobuf;
+	int result;
+
+	fxfr->Type = FCM_PACKET_INPUT | 0x00;
+	fxfr->Timeout = 0;    /* Short timeout for debugging. */
+	fxfr->Count = cpu_to_le32 (count);
+	memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
+
+	US_DEBUGP("Read data Freecom! (c=%d)\n", count);
+
+	/* Issue the transfer command. */
+	result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
+			FCM_PACKET_LENGTH, NULL);
+	if (result != USB_STOR_XFER_GOOD) {
+		US_DEBUGP ("Freecom readdata transport error\n");
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* Now transfer all of our blocks. */
+	US_DEBUGP("Start of read\n");
+	result = usb_stor_bulk_transfer_sg(us, ipipe, srb->request_buffer,
+			count, srb->use_sg, &srb->resid);
+	US_DEBUGP("freecom_readdata done!\n");
+
+	if (result > USB_STOR_XFER_SHORT)
+		return USB_STOR_TRANSPORT_ERROR;
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+static int
+freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
+		int unsigned ipipe, unsigned int opipe, int count)
+{
+	struct freecom_xfer_wrap *fxfr =
+		(struct freecom_xfer_wrap *) us->iobuf;
+	int result;
+
+	fxfr->Type = FCM_PACKET_OUTPUT | 0x00;
+	fxfr->Timeout = 0;    /* Short timeout for debugging. */
+	fxfr->Count = cpu_to_le32 (count);
+	memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
+
+	US_DEBUGP("Write data Freecom! (c=%d)\n", count);
+
+	/* Issue the transfer command. */
+	result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
+			FCM_PACKET_LENGTH, NULL);
+	if (result != USB_STOR_XFER_GOOD) {
+		US_DEBUGP ("Freecom writedata transport error\n");
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* Now transfer all of our blocks. */
+	US_DEBUGP("Start of write\n");
+	result = usb_stor_bulk_transfer_sg(us, opipe, srb->request_buffer,
+			count, srb->use_sg, &srb->resid);
+
+	US_DEBUGP("freecom_writedata done!\n");
+	if (result > USB_STOR_XFER_SHORT)
+		return USB_STOR_TRANSPORT_ERROR;
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+/*
+ * Transport for the Freecom USB/IDE adaptor.
+ *
+ */
+int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
+{
+	struct freecom_cb_wrap *fcb;
+	struct freecom_status  *fst;
+	unsigned int ipipe, opipe;		/* We need both pipes. */
+	int result;
+	unsigned int partial;
+	int length;
+
+	fcb = (struct freecom_cb_wrap *) us->iobuf;
+	fst = (struct freecom_status *) us->iobuf;
+
+	US_DEBUGP("Freecom TRANSPORT STARTED\n");
+
+	/* Get handles for both transports. */
+	opipe = us->send_bulk_pipe;
+	ipipe = us->recv_bulk_pipe;
+
+	/* The ATAPI Command always goes out first. */
+	fcb->Type = FCM_PACKET_ATAPI | 0x00;
+	fcb->Timeout = 0;
+	memcpy (fcb->Atapi, srb->cmnd, 12);
+	memset (fcb->Filler, 0, sizeof (fcb->Filler));
+
+	US_DEBUG(pdump (srb->cmnd, 12));
+
+	/* Send it out. */
+	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
+			FCM_PACKET_LENGTH, NULL);
+
+	/* The Freecom device will only fail if there is something wrong in
+	 * USB land.  It returns the status in its own registers, which
+	 * come back in the bulk pipe. */
+	if (result != USB_STOR_XFER_GOOD) {
+		US_DEBUGP ("freecom transport error\n");
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* There are times we can optimize out this status read, but it
+	 * doesn't hurt us to always do it now. */
+	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
+			FCM_STATUS_PACKET_LENGTH, &partial);
+	US_DEBUGP("foo Status result %d %u\n", result, partial);
+	if (result != USB_STOR_XFER_GOOD)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	US_DEBUG(pdump ((void *) fst, partial));
+
+	/* The firmware will time-out commands after 20 seconds. Some commands
+	 * can legitimately take longer than this, so we use a different
+	 * command that only waits for the interrupt and then sends status,
+	 * without having to send a new ATAPI command to the device. 
+	 *
+	 * NOTE: There is some indication that a data transfer after a timeout
+	 * may not work, but that is a condition that should never happen.
+	 */
+	while (fst->Status & FCM_STATUS_BUSY) {
+		US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
+		US_DEBUGP("fst->Status is %x\n", fst->Status);
+
+		/* Get the status again */
+		fcb->Type = FCM_PACKET_STATUS;
+		fcb->Timeout = 0;
+		memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
+		memset (fcb->Filler, 0, sizeof (fcb->Filler));
+
+		/* Send it out. */
+		result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
+				FCM_PACKET_LENGTH, NULL);
+
+		/* The Freecom device will only fail if there is something
+		 * wrong in USB land.  It returns the status in its own
+		 * registers, which come back in the bulk pipe.
+		 */
+		if (result != USB_STOR_XFER_GOOD) {
+			US_DEBUGP ("freecom transport error\n");
+			return USB_STOR_TRANSPORT_ERROR;
+		}
+
+		/* get the data */
+		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
+				FCM_STATUS_PACKET_LENGTH, &partial);
+
+		US_DEBUGP("bar Status result %d %u\n", result, partial);
+		if (result != USB_STOR_XFER_GOOD)
+			return USB_STOR_TRANSPORT_ERROR;
+
+		US_DEBUG(pdump ((void *) fst, partial));
+	}
+
+	if (partial != 4)
+		return USB_STOR_TRANSPORT_ERROR;
+	if ((fst->Status & 1) != 0) {
+		US_DEBUGP("operation failed\n");
+		return USB_STOR_TRANSPORT_FAILED;
+	}
+
+	/* The device might not have as much data available as we
+	 * requested.  If you ask for more than the device has, this reads
+	 * and such will hang. */
+	US_DEBUGP("Device indicates that it has %d bytes available\n",
+			le16_to_cpu (fst->Count));
+	US_DEBUGP("SCSI requested %d\n", srb->request_bufflen);
+
+	/* Find the length we desire to read. */
+	switch (srb->cmnd[0]) {
+		case INQUIRY:
+		case REQUEST_SENSE:		/* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
+		case MODE_SENSE:
+		case MODE_SENSE_10:
+			length = le16_to_cpu(fst->Count);
+			break;
+		default:
+ 			length = srb->request_bufflen;
+	}
+
+	/* verify that this amount is legal */
+	if (length > srb->request_bufflen) {
+		length = srb->request_bufflen;
+		US_DEBUGP("Truncating request to match buffer length: %d\n", length);
+	}
+
+	/* What we do now depends on what direction the data is supposed to
+	 * move in. */
+
+	switch (us->srb->sc_data_direction) {
+	case DMA_FROM_DEVICE:
+		/* catch bogus "read 0 length" case */
+		if (!length)
+			break;
+		/* Make sure that the status indicates that the device
+		 * wants data as well. */
+		if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
+			US_DEBUGP("SCSI wants data, drive doesn't have any\n");
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+		result = freecom_readdata (srb, us, ipipe, opipe, length);
+		if (result != USB_STOR_TRANSPORT_GOOD)
+			return result;
+
+		US_DEBUGP("FCM: Waiting for status\n");
+		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
+				FCM_PACKET_LENGTH, &partial);
+		US_DEBUG(pdump ((void *) fst, partial));
+
+		if (partial != 4 || result > USB_STOR_XFER_SHORT)
+			return USB_STOR_TRANSPORT_ERROR;
+		if ((fst->Status & ERR_STAT) != 0) {
+			US_DEBUGP("operation failed\n");
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+		if ((fst->Reason & 3) != 3) {
+			US_DEBUGP("Drive seems still hungry\n");
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+		US_DEBUGP("Transfer happy\n");
+		break;
+
+	case DMA_TO_DEVICE:
+		/* catch bogus "write 0 length" case */
+		if (!length)
+			break;
+		/* Make sure the status indicates that the device wants to
+		 * send us data. */
+		/* !!IMPLEMENT!! */
+		result = freecom_writedata (srb, us, ipipe, opipe, length);
+		if (result != USB_STOR_TRANSPORT_GOOD)
+			return result;
+
+		US_DEBUGP("FCM: Waiting for status\n");
+		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
+				FCM_PACKET_LENGTH, &partial);
+
+		if (partial != 4 || result > USB_STOR_XFER_SHORT)
+			return USB_STOR_TRANSPORT_ERROR;
+		if ((fst->Status & ERR_STAT) != 0) {
+			US_DEBUGP("operation failed\n");
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+		if ((fst->Reason & 3) != 3) {
+			US_DEBUGP("Drive seems still hungry\n");
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+
+		US_DEBUGP("Transfer happy\n");
+		break;
+
+
+	case DMA_NONE:
+		/* Easy, do nothing. */
+		break;
+
+	default:
+		/* should never hit here -- filtered in usb.c */
+		US_DEBUGP ("freecom unimplemented direction: %d\n",
+				us->srb->sc_data_direction);
+		// Return fail, SCSI seems to handle this better.
+		return USB_STOR_TRANSPORT_FAILED;
+		break;
+	}
+
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+int
+freecom_init (struct us_data *us)
+{
+	int result;
+	char *buffer = us->iobuf;
+
+	/* The DMA-mapped I/O buffer is 64 bytes long, just right for
+	 * all our packets.  No need to allocate any extra buffer space.
+	 */
+
+	result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
+			0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
+	buffer[32] = '\0';
+	US_DEBUGP("String returned from FC init is: %s\n", buffer);
+
+	/* Special thanks to the people at Freecom for providing me with
+	 * this "magic sequence", which they use in their Windows and MacOS
+	 * drivers to make sure that all the attached perhiperals are
+	 * properly reset.
+	 */
+
+	/* send reset */
+	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
+			0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
+	US_DEBUGP("result from activate reset is %d\n", result);
+
+	/* wait 250ms */
+	mdelay(250);
+
+	/* clear reset */
+	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
+			0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
+	US_DEBUGP("result from clear reset is %d\n", result);
+
+	/* wait 3 seconds */
+	mdelay(3 * 1000);
+
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+int usb_stor_freecom_reset(struct us_data *us)
+{
+	printk (KERN_CRIT "freecom reset called\n");
+
+	/* We don't really have this feature. */
+	return FAILED;
+}
+
+#ifdef CONFIG_USB_STORAGE_DEBUG
+static void pdump (void *ibuffer, int length)
+{
+	static char line[80];
+	int offset = 0;
+	unsigned char *buffer = (unsigned char *) ibuffer;
+	int i, j;
+	int from, base;
+
+	offset = 0;
+	for (i = 0; i < length; i++) {
+		if ((i & 15) == 0) {
+			if (i > 0) {
+				offset += sprintf (line+offset, " - ");
+				for (j = i - 16; j < i; j++) {
+					if (buffer[j] >= 32 && buffer[j] <= 126)
+						line[offset++] = buffer[j];
+					else
+						line[offset++] = '.';
+				}
+				line[offset] = 0;
+				US_DEBUGP("%s\n", line);
+				offset = 0;
+			}
+			offset += sprintf (line+offset, "%08x:", i);
+		}
+		else if ((i & 7) == 0) {
+			offset += sprintf (line+offset, " -");
+		}
+		offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
+	}
+
+	/* Add the last "chunk" of data. */
+	from = (length - 1) % 16;
+	base = ((length - 1) / 16) * 16;
+
+	for (i = from + 1; i < 16; i++)
+		offset += sprintf (line+offset, "   ");
+	if (from < 8)
+		offset += sprintf (line+offset, "  ");
+	offset += sprintf (line+offset, " - ");
+
+	for (i = 0; i <= from; i++) {
+		if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
+			line[offset++] = buffer[base+i];
+		else
+			line[offset++] = '.';
+	}
+	line[offset] = 0;
+	US_DEBUGP("%s\n", line);
+	offset = 0;
+}
+#endif
+