1da177e4c3
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!
489 lines
14 KiB
C
489 lines
14 KiB
C
/* Driver for Freecom USB/IDE adaptor
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*
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* $Id: freecom.c,v 1.22 2002/04/22 03:39:43 mdharm Exp $
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*
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* Freecom v0.1:
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*
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* First release
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*
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* Current development and maintenance by:
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* (C) 2000 David Brown <usb-storage@davidb.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* This driver was developed with information provided in FREECOM's USB
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* Programmers Reference Guide. For further information contact Freecom
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* (http://www.freecom.de/)
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*/
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#include <linux/config.h>
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#include <linux/hdreg.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include "usb.h"
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#include "transport.h"
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#include "protocol.h"
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#include "debug.h"
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#include "freecom.h"
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#ifdef CONFIG_USB_STORAGE_DEBUG
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static void pdump (void *, int);
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#endif
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/* Bits of HD_STATUS */
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#define ERR_STAT 0x01
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#define DRQ_STAT 0x08
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/* All of the outgoing packets are 64 bytes long. */
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struct freecom_cb_wrap {
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u8 Type; /* Command type. */
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u8 Timeout; /* Timeout in seconds. */
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u8 Atapi[12]; /* An ATAPI packet. */
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u8 Filler[50]; /* Padding Data. */
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};
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struct freecom_xfer_wrap {
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u8 Type; /* Command type. */
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u8 Timeout; /* Timeout in seconds. */
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__le32 Count; /* Number of bytes to transfer. */
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u8 Pad[58];
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} __attribute__ ((packed));
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struct freecom_ide_out {
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u8 Type; /* Type + IDE register. */
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u8 Pad;
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__le16 Value; /* Value to write. */
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u8 Pad2[60];
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};
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struct freecom_ide_in {
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u8 Type; /* Type | IDE register. */
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u8 Pad[63];
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};
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struct freecom_status {
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u8 Status;
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u8 Reason;
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__le16 Count;
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u8 Pad[60];
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};
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/* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide
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* register. */
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#define FCM_INT_STATUS 0x02 /* INDEX_STAT */
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#define FCM_STATUS_BUSY 0x80
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/* These are the packet types. The low bit indicates that this command
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* should wait for an interrupt. */
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#define FCM_PACKET_ATAPI 0x21
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#define FCM_PACKET_STATUS 0x20
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/* Receive data from the IDE interface. The ATAPI packet has already
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* waited, so the data should be immediately available. */
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#define FCM_PACKET_INPUT 0x81
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/* Send data to the IDE interface. */
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#define FCM_PACKET_OUTPUT 0x01
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/* Write a value to an ide register. Or the ide register to write after
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* munging the address a bit. */
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#define FCM_PACKET_IDE_WRITE 0x40
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#define FCM_PACKET_IDE_READ 0xC0
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/* All packets (except for status) are 64 bytes long. */
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#define FCM_PACKET_LENGTH 64
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#define FCM_STATUS_PACKET_LENGTH 4
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static int
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freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
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unsigned int ipipe, unsigned int opipe, int count)
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{
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struct freecom_xfer_wrap *fxfr =
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(struct freecom_xfer_wrap *) us->iobuf;
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int result;
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fxfr->Type = FCM_PACKET_INPUT | 0x00;
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fxfr->Timeout = 0; /* Short timeout for debugging. */
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fxfr->Count = cpu_to_le32 (count);
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memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
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US_DEBUGP("Read data Freecom! (c=%d)\n", count);
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/* Issue the transfer command. */
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result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
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FCM_PACKET_LENGTH, NULL);
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if (result != USB_STOR_XFER_GOOD) {
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US_DEBUGP ("Freecom readdata transport error\n");
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return USB_STOR_TRANSPORT_ERROR;
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}
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/* Now transfer all of our blocks. */
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US_DEBUGP("Start of read\n");
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result = usb_stor_bulk_transfer_sg(us, ipipe, srb->request_buffer,
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count, srb->use_sg, &srb->resid);
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US_DEBUGP("freecom_readdata done!\n");
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if (result > USB_STOR_XFER_SHORT)
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return USB_STOR_TRANSPORT_ERROR;
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return USB_STOR_TRANSPORT_GOOD;
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}
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static int
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freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
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int unsigned ipipe, unsigned int opipe, int count)
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{
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struct freecom_xfer_wrap *fxfr =
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(struct freecom_xfer_wrap *) us->iobuf;
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int result;
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fxfr->Type = FCM_PACKET_OUTPUT | 0x00;
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fxfr->Timeout = 0; /* Short timeout for debugging. */
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fxfr->Count = cpu_to_le32 (count);
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memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
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US_DEBUGP("Write data Freecom! (c=%d)\n", count);
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/* Issue the transfer command. */
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result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
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FCM_PACKET_LENGTH, NULL);
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if (result != USB_STOR_XFER_GOOD) {
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US_DEBUGP ("Freecom writedata transport error\n");
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return USB_STOR_TRANSPORT_ERROR;
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}
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/* Now transfer all of our blocks. */
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US_DEBUGP("Start of write\n");
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result = usb_stor_bulk_transfer_sg(us, opipe, srb->request_buffer,
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count, srb->use_sg, &srb->resid);
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US_DEBUGP("freecom_writedata done!\n");
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if (result > USB_STOR_XFER_SHORT)
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return USB_STOR_TRANSPORT_ERROR;
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return USB_STOR_TRANSPORT_GOOD;
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}
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/*
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* Transport for the Freecom USB/IDE adaptor.
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*
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*/
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int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
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{
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struct freecom_cb_wrap *fcb;
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struct freecom_status *fst;
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unsigned int ipipe, opipe; /* We need both pipes. */
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int result;
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unsigned int partial;
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int length;
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fcb = (struct freecom_cb_wrap *) us->iobuf;
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fst = (struct freecom_status *) us->iobuf;
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US_DEBUGP("Freecom TRANSPORT STARTED\n");
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/* Get handles for both transports. */
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opipe = us->send_bulk_pipe;
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ipipe = us->recv_bulk_pipe;
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/* The ATAPI Command always goes out first. */
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fcb->Type = FCM_PACKET_ATAPI | 0x00;
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fcb->Timeout = 0;
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memcpy (fcb->Atapi, srb->cmnd, 12);
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memset (fcb->Filler, 0, sizeof (fcb->Filler));
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US_DEBUG(pdump (srb->cmnd, 12));
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/* Send it out. */
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result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
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FCM_PACKET_LENGTH, NULL);
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/* The Freecom device will only fail if there is something wrong in
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* USB land. It returns the status in its own registers, which
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* come back in the bulk pipe. */
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if (result != USB_STOR_XFER_GOOD) {
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US_DEBUGP ("freecom transport error\n");
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return USB_STOR_TRANSPORT_ERROR;
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}
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/* There are times we can optimize out this status read, but it
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* doesn't hurt us to always do it now. */
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result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
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FCM_STATUS_PACKET_LENGTH, &partial);
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US_DEBUGP("foo Status result %d %u\n", result, partial);
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if (result != USB_STOR_XFER_GOOD)
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return USB_STOR_TRANSPORT_ERROR;
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US_DEBUG(pdump ((void *) fst, partial));
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/* The firmware will time-out commands after 20 seconds. Some commands
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* can legitimately take longer than this, so we use a different
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* command that only waits for the interrupt and then sends status,
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* without having to send a new ATAPI command to the device.
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*
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* NOTE: There is some indication that a data transfer after a timeout
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* may not work, but that is a condition that should never happen.
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*/
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while (fst->Status & FCM_STATUS_BUSY) {
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US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
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US_DEBUGP("fst->Status is %x\n", fst->Status);
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/* Get the status again */
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fcb->Type = FCM_PACKET_STATUS;
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fcb->Timeout = 0;
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memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
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memset (fcb->Filler, 0, sizeof (fcb->Filler));
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/* Send it out. */
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result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
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FCM_PACKET_LENGTH, NULL);
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/* The Freecom device will only fail if there is something
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* wrong in USB land. It returns the status in its own
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* registers, which come back in the bulk pipe.
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*/
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if (result != USB_STOR_XFER_GOOD) {
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US_DEBUGP ("freecom transport error\n");
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return USB_STOR_TRANSPORT_ERROR;
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}
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/* get the data */
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result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
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FCM_STATUS_PACKET_LENGTH, &partial);
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US_DEBUGP("bar Status result %d %u\n", result, partial);
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if (result != USB_STOR_XFER_GOOD)
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return USB_STOR_TRANSPORT_ERROR;
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US_DEBUG(pdump ((void *) fst, partial));
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}
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if (partial != 4)
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return USB_STOR_TRANSPORT_ERROR;
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if ((fst->Status & 1) != 0) {
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US_DEBUGP("operation failed\n");
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return USB_STOR_TRANSPORT_FAILED;
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}
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/* The device might not have as much data available as we
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* requested. If you ask for more than the device has, this reads
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* and such will hang. */
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US_DEBUGP("Device indicates that it has %d bytes available\n",
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le16_to_cpu (fst->Count));
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US_DEBUGP("SCSI requested %d\n", srb->request_bufflen);
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/* Find the length we desire to read. */
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switch (srb->cmnd[0]) {
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case INQUIRY:
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case REQUEST_SENSE: /* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
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case MODE_SENSE:
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case MODE_SENSE_10:
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length = le16_to_cpu(fst->Count);
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break;
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default:
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length = srb->request_bufflen;
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}
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/* verify that this amount is legal */
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if (length > srb->request_bufflen) {
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length = srb->request_bufflen;
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US_DEBUGP("Truncating request to match buffer length: %d\n", length);
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}
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/* What we do now depends on what direction the data is supposed to
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* move in. */
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switch (us->srb->sc_data_direction) {
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case DMA_FROM_DEVICE:
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/* catch bogus "read 0 length" case */
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if (!length)
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break;
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/* Make sure that the status indicates that the device
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* wants data as well. */
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if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
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US_DEBUGP("SCSI wants data, drive doesn't have any\n");
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return USB_STOR_TRANSPORT_FAILED;
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}
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result = freecom_readdata (srb, us, ipipe, opipe, length);
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if (result != USB_STOR_TRANSPORT_GOOD)
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return result;
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US_DEBUGP("FCM: Waiting for status\n");
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result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
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FCM_PACKET_LENGTH, &partial);
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US_DEBUG(pdump ((void *) fst, partial));
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if (partial != 4 || result > USB_STOR_XFER_SHORT)
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return USB_STOR_TRANSPORT_ERROR;
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if ((fst->Status & ERR_STAT) != 0) {
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US_DEBUGP("operation failed\n");
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return USB_STOR_TRANSPORT_FAILED;
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}
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if ((fst->Reason & 3) != 3) {
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US_DEBUGP("Drive seems still hungry\n");
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return USB_STOR_TRANSPORT_FAILED;
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}
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US_DEBUGP("Transfer happy\n");
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break;
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case DMA_TO_DEVICE:
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/* catch bogus "write 0 length" case */
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if (!length)
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break;
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/* Make sure the status indicates that the device wants to
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* send us data. */
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/* !!IMPLEMENT!! */
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result = freecom_writedata (srb, us, ipipe, opipe, length);
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if (result != USB_STOR_TRANSPORT_GOOD)
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return result;
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US_DEBUGP("FCM: Waiting for status\n");
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result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
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FCM_PACKET_LENGTH, &partial);
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if (partial != 4 || result > USB_STOR_XFER_SHORT)
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return USB_STOR_TRANSPORT_ERROR;
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if ((fst->Status & ERR_STAT) != 0) {
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US_DEBUGP("operation failed\n");
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return USB_STOR_TRANSPORT_FAILED;
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}
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if ((fst->Reason & 3) != 3) {
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US_DEBUGP("Drive seems still hungry\n");
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return USB_STOR_TRANSPORT_FAILED;
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}
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US_DEBUGP("Transfer happy\n");
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break;
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case DMA_NONE:
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/* Easy, do nothing. */
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break;
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default:
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/* should never hit here -- filtered in usb.c */
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US_DEBUGP ("freecom unimplemented direction: %d\n",
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us->srb->sc_data_direction);
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// Return fail, SCSI seems to handle this better.
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return USB_STOR_TRANSPORT_FAILED;
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break;
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}
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return USB_STOR_TRANSPORT_GOOD;
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}
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int
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freecom_init (struct us_data *us)
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{
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int result;
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char *buffer = us->iobuf;
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/* The DMA-mapped I/O buffer is 64 bytes long, just right for
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* all our packets. No need to allocate any extra buffer space.
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*/
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result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
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0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
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buffer[32] = '\0';
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US_DEBUGP("String returned from FC init is: %s\n", buffer);
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/* Special thanks to the people at Freecom for providing me with
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* this "magic sequence", which they use in their Windows and MacOS
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* drivers to make sure that all the attached perhiperals are
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* properly reset.
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*/
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/* send reset */
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result = usb_stor_control_msg(us, us->send_ctrl_pipe,
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0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
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US_DEBUGP("result from activate reset is %d\n", result);
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/* wait 250ms */
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mdelay(250);
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/* clear reset */
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result = usb_stor_control_msg(us, us->send_ctrl_pipe,
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0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
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US_DEBUGP("result from clear reset is %d\n", result);
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/* wait 3 seconds */
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mdelay(3 * 1000);
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return USB_STOR_TRANSPORT_GOOD;
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}
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int usb_stor_freecom_reset(struct us_data *us)
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{
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printk (KERN_CRIT "freecom reset called\n");
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/* We don't really have this feature. */
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return FAILED;
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}
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#ifdef CONFIG_USB_STORAGE_DEBUG
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static void pdump (void *ibuffer, int length)
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{
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static char line[80];
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int offset = 0;
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unsigned char *buffer = (unsigned char *) ibuffer;
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int i, j;
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int from, base;
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offset = 0;
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for (i = 0; i < length; i++) {
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if ((i & 15) == 0) {
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if (i > 0) {
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offset += sprintf (line+offset, " - ");
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for (j = i - 16; j < i; j++) {
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if (buffer[j] >= 32 && buffer[j] <= 126)
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line[offset++] = buffer[j];
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else
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line[offset++] = '.';
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}
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line[offset] = 0;
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US_DEBUGP("%s\n", line);
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offset = 0;
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}
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offset += sprintf (line+offset, "%08x:", i);
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}
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else if ((i & 7) == 0) {
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offset += sprintf (line+offset, " -");
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}
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offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
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}
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/* Add the last "chunk" of data. */
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from = (length - 1) % 16;
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base = ((length - 1) / 16) * 16;
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for (i = from + 1; i < 16; i++)
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offset += sprintf (line+offset, " ");
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if (from < 8)
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offset += sprintf (line+offset, " ");
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offset += sprintf (line+offset, " - ");
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for (i = 0; i <= from; i++) {
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if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
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line[offset++] = buffer[base+i];
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else
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line[offset++] = '.';
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}
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line[offset] = 0;
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US_DEBUGP("%s\n", line);
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offset = 0;
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}
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#endif
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