freecom.c
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上传日期:2013-04-10
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- /* Driver for Freecom USB/IDE adaptor
- *
- * $Id: freecom.c,v 1.21 2001/12/29 03:47:33 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 "transport.h"
- #include "protocol.h"
- #include "usb.h"
- #include "debug.h"
- #include "freecom.h"
- #include <linux/hdreg.h>
- #ifdef CONFIG_USB_STORAGE_DEBUG
- static void pdump (void *, int);
- #endif
- struct freecom_udata {
- __u8 buffer[64]; /* Common command block. */
- };
- typedef struct freecom_udata *freecom_udata_t;
- /* 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. */
- __u32 Count; /* Number of bytes to transfer. */
- __u8 Pad[58];
- } __attribute__ ((packed));
- struct freecom_ide_out {
- __u8 Type; /* Type + IDE register. */
- __u8 Pad;
- __u16 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;
- __u16 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
- /*
- * Transfer an entire SCSI command's worth of data payload over the bulk
- * pipe.
- *
- * Note that this uses usb_stor_transfer_partial to achieve it's goals -- this
- * function simply determines if we're going to use scatter-gather or not,
- * and acts appropriately. For now, it also re-interprets the error codes.
- */
- static void us_transfer_freecom(Scsi_Cmnd *srb, struct us_data* us, int transfer_amount)
- {
- int i;
- int result = -1;
- struct scatterlist *sg;
- unsigned int total_transferred = 0;
- /* was someone foolish enough to request more data than available
- * buffer space? */
- if (transfer_amount > srb->request_bufflen)
- transfer_amount = srb->request_bufflen;
- /* are we scatter-gathering? */
- if (srb->use_sg) {
- /* loop over all the scatter gather structures and
- * make the appropriate requests for each, until done
- */
- sg = (struct scatterlist *) srb->request_buffer;
- for (i = 0; i < srb->use_sg; i++) {
- US_DEBUGP("transfer_amount: %d and total_transferred: %dn", transfer_amount, total_transferred);
- /* End this if we're done */
- if (transfer_amount == total_transferred)
- break;
- /* transfer the lesser of the next buffer or the
- * remaining data */
- if (transfer_amount - total_transferred >=
- sg[i].length) {
- result = usb_stor_transfer_partial(us,
- sg[i].address, sg[i].length);
- total_transferred += sg[i].length;
- } else {
- result = usb_stor_transfer_partial(us,
- sg[i].address,
- transfer_amount - total_transferred);
- total_transferred += transfer_amount - total_transferred;
- }
- /* if we get an error, end the loop here */
- if (result)
- break;
- }
- }
- else
- /* no scatter-gather, just make the request */
- result = usb_stor_transfer_partial(us, srb->request_buffer,
- transfer_amount);
- /* return the result in the data structure itself */
- srb->result = result;
- }
- #if 0
- /* Write a value to an ide register. */
- static int
- freecom_ide_write (struct us_data *us, int reg, int value)
- {
- freecom_udata_t extra = (freecom_udata_t) us->extra;
- struct freecom_ide_out *ideout =
- (struct freecom_ide_out *) extra->buffer;
- int opipe;
- int result, partial;
- US_DEBUGP("IDE out 0x%02x <- 0x%02xn", reg, value);
- /* Get handles for both transports. */
- opipe = usb_sndbulkpipe (us->pusb_dev, us->ep_out);
- if (reg < 0 || reg > 8)
- return USB_STOR_TRANSPORT_ERROR;
- if (reg < 8)
- reg |= 0x20;
- else
- reg = 0x0e;
- ideout->Type = FCM_PACKET_IDE_WRITE | reg;
- ideout->Pad = 0;
- ideout->Value = cpu_to_le16 (value);
- memset (ideout->Pad2, 0, sizeof (ideout->Pad2));
- result = usb_stor_bulk_msg (us, ideout, opipe,
- FCM_PACKET_LENGTH, &partial);
- if (result != 0) {
- if (result == -ENOENT)
- return US_BULK_TRANSFER_ABORTED;
- else
- return USB_STOR_TRANSPORT_ERROR;
- }
- return USB_STOR_TRANSPORT_GOOD;
- }
- /* Read a value from an ide register. */
- static int
- freecom_ide_read (struct us_data *us, int reg, int *value)
- {
- freecom_udata_t extra = (freecom_udata_t) us->extra;
- struct freecom_ide_in *idein =
- (struct freecom_ide_in *) extra->buffer;
- __u8 *buffer = extra->buffer;
- int ipipe, opipe;
- int result, partial;
- int desired_length;
- /* Get handles for both transports. */
- opipe = usb_sndbulkpipe (us->pusb_dev, us->ep_out);
- ipipe = usb_rcvbulkpipe (us->pusb_dev, us->ep_in);
- if (reg < 0 || reg > 8)
- return USB_STOR_TRANSPORT_ERROR;
- if (reg < 8)
- reg |= 0x10;
- else
- reg = 0x0e;
- US_DEBUGP("IDE in request for register 0x%02xn", reg);
- idein->Type = FCM_PACKET_IDE_READ | reg;
- memset (idein->Pad, 0, sizeof (idein->Pad));
- result = usb_stor_bulk_msg (us, idein, opipe,
- FCM_PACKET_LENGTH, &partial);
- if (result != 0) {
- if (result == -ENOENT)
- return US_BULK_TRANSFER_ABORTED;
- else
- return USB_STOR_TRANSPORT_ERROR;
- }
- desired_length = 1;
- if (reg == 0x10)
- desired_length = 2;
- result = usb_stor_bulk_msg (us, buffer, ipipe,
- desired_length, &partial);
- if (result != 0) {
- if (result == -ENOENT)
- return US_BULK_TRANSFER_ABORTED;
- else
- return USB_STOR_TRANSPORT_ERROR;
- }
- US_DEBUGP("IDE in partial is %dn", partial);
- if (desired_length == 1)
- *value = buffer[0];
- else
- *value = le16_to_cpu (*(__u16 *) buffer);
- US_DEBUGP("IDE in 0x%02x -> 0x%02xn", reg, *value);
- return USB_STOR_TRANSPORT_GOOD;
- }
- #endif
- static int
- freecom_readdata (Scsi_Cmnd *srb, struct us_data *us,
- int ipipe, int opipe, int count)
- {
- freecom_udata_t extra = (freecom_udata_t) us->extra;
- struct freecom_xfer_wrap *fxfr =
- (struct freecom_xfer_wrap *) extra->buffer;
- int result, partial;
- 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_msg (us, fxfr, opipe,
- FCM_PACKET_LENGTH, &partial);
- if (result != 0) {
- US_DEBUGP ("Freecom readdata xpot failure: r=%d, p=%dn",
- result, partial);
- /* -ENOENT -- we canceled this transfer */
- if (result == -ENOENT) {
- US_DEBUGP("freecom_readdata(): transfer abortedn");
- return US_BULK_TRANSFER_ABORTED;
- }
- return USB_STOR_TRANSPORT_ERROR;
- }
- US_DEBUGP("Done issuing read request: %d %dn", result, partial);
- /* Now transfer all of our blocks. */
- US_DEBUGP("Start of readn");
- us_transfer_freecom(srb, us, count);
- US_DEBUGP("freecom_readdata done!n");
- return USB_STOR_TRANSPORT_GOOD;
- }
- static int
- freecom_writedata (Scsi_Cmnd *srb, struct us_data *us,
- int ipipe, int opipe, int count)
- {
- freecom_udata_t extra = (freecom_udata_t) us->extra;
- struct freecom_xfer_wrap *fxfr =
- (struct freecom_xfer_wrap *) extra->buffer;
- int result, partial;
- 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_msg (us, fxfr, opipe,
- FCM_PACKET_LENGTH, &partial);
- if (result != 0) {
- US_DEBUGP ("Freecom writedata xpot failure: r=%d, p=%dn",
- result, partial);
- /* -ENOENT -- we canceled this transfer */
- if (result == -ENOENT) {
- US_DEBUGP("freecom_writedata(): transfer abortedn");
- return US_BULK_TRANSFER_ABORTED;
- }
- return USB_STOR_TRANSPORT_ERROR;
- }
- US_DEBUGP("Done issuing write request: %d %dn",
- result, partial);
- /* Now transfer all of our blocks. */
- US_DEBUGP("Start of writen");
- us_transfer_freecom(srb, us, count);
- US_DEBUGP("freecom_writedata done!n");
- return USB_STOR_TRANSPORT_GOOD;
- }
- /*
- * Transport for the Freecom USB/IDE adaptor.
- *
- */
- int freecom_transport(Scsi_Cmnd *srb, struct us_data *us)
- {
- struct freecom_cb_wrap *fcb;
- struct freecom_status *fst;
- int ipipe, opipe; /* We need both pipes. */
- int result;
- int partial;
- int length;
- freecom_udata_t extra;
- extra = (freecom_udata_t) us->extra;
- fcb = (struct freecom_cb_wrap *) extra->buffer;
- fst = (struct freecom_status *) extra->buffer;
- US_DEBUGP("Freecom TRANSPORT STARTEDn");
- /* Get handles for both transports. */
- opipe = usb_sndbulkpipe (us->pusb_dev, us->ep_out);
- ipipe = usb_rcvbulkpipe (us->pusb_dev, us->ep_in);
- /* 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_msg (us, fcb, opipe,
- FCM_PACKET_LENGTH, &partial);
- /* 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 != 0) {
- US_DEBUGP ("freecom xport failure: r=%d, p=%dn",
- result, partial);
- /* -ENOENT -- we canceled this transfer */
- if (result == -ENOENT) {
- US_DEBUGP("freecom_transport(): transfer abortedn");
- return US_BULK_TRANSFER_ABORTED;
- }
- 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_msg (us, fst, ipipe,
- FCM_PACKET_LENGTH, &partial);
- US_DEBUGP("foo Status result %d %dn", result, partial);
- /* -ENOENT -- we canceled this transfer */
- if (result == -ENOENT) {
- US_DEBUGP("freecom_transport(): transfer abortedn");
- return US_BULK_TRANSFER_ABORTED;
- }
- 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 occured!n");
- US_DEBUGP("fst->Status is %xn", 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_msg (us, fcb, opipe,
- FCM_PACKET_LENGTH, &partial);
- /* 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 != 0) {
- US_DEBUGP ("freecom xport failure: r=%d, p=%dn",
- result, partial);
- /* -ENOENT -- we canceled this transfer */
- if (result == -ENOENT) {
- US_DEBUGP("freecom_transport(): transfer abortedn");
- return US_BULK_TRANSFER_ABORTED;
- }
- return USB_STOR_TRANSPORT_ERROR;
- }
- /* get the data */
- result = usb_stor_bulk_msg (us, fst, ipipe,
- FCM_PACKET_LENGTH, &partial);
- US_DEBUGP("bar Status result %d %dn", result, partial);
- /* -ENOENT -- we canceled this transfer */
- if (result == -ENOENT) {
- US_DEBUGP("freecom_transport(): transfer abortedn");
- return US_BULK_TRANSFER_ABORTED;
- }
- US_DEBUG(pdump ((void *) fst, partial));
- }
- if (partial != 4 || result != 0) {
- return USB_STOR_TRANSPORT_ERROR;
- }
- if ((fst->Status & 1) != 0) {
- US_DEBUGP("operation failedn");
- 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 availablen",
- le16_to_cpu (fst->Count));
- US_DEBUGP("SCSI requested %dn", usb_stor_transfer_length(srb));
- /* 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 = fst->Count;
- break;
- default:
- length = usb_stor_transfer_length (srb);
- }
- /* verify that this amount is legal */
- if (length > srb->request_bufflen) {
- length = srb->request_bufflen;
- US_DEBUGP("Truncating request to match buffer length: %dn", length);
- }
- /* What we do now depends on what direction the data is supposed to
- * move in. */
- switch (us->srb->sc_data_direction) {
- case SCSI_DATA_READ:
- /* 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 anyn");
- 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 statusn");
- result = usb_stor_bulk_msg (us, fst, ipipe,
- FCM_PACKET_LENGTH, &partial);
- US_DEBUG(pdump ((void *) fst, partial));
- if (result == -ENOENT) {
- US_DEBUGP ("freecom_transport: transfer abortedn");
- return US_BULK_TRANSFER_ABORTED;
- }
- if (partial != 4 || result != 0)
- return USB_STOR_TRANSPORT_ERROR;
- if ((fst->Status & ERR_STAT) != 0) {
- US_DEBUGP("operation failedn");
- return USB_STOR_TRANSPORT_FAILED;
- }
- if ((fst->Reason & 3) != 3) {
- US_DEBUGP("Drive seems still hungryn");
- return USB_STOR_TRANSPORT_FAILED;
- }
- US_DEBUGP("Transfer happyn");
- break;
- case SCSI_DATA_WRITE:
- /* 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 statusn");
- result = usb_stor_bulk_msg (us, fst, ipipe,
- FCM_PACKET_LENGTH, &partial);
- if (result == -ENOENT) {
- US_DEBUGP ("freecom_transport: transfer abortedn");
- return US_BULK_TRANSFER_ABORTED;
- }
- if (partial != 4 || result != 0)
- return USB_STOR_TRANSPORT_ERROR;
- if ((fst->Status & ERR_STAT) != 0) {
- US_DEBUGP("operation failedn");
- return USB_STOR_TRANSPORT_FAILED;
- }
- if ((fst->Reason & 3) != 3) {
- US_DEBUGP("Drive seems still hungryn");
- return USB_STOR_TRANSPORT_FAILED;
- }
- US_DEBUGP("Transfer happyn");
- break;
- case SCSI_DATA_NONE:
- /* Easy, do nothing. */
- break;
- default:
- US_DEBUGP ("freecom unimplemented direction: %dn",
- us->srb->sc_data_direction);
- // Return fail, SCSI seems to handle this better.
- return USB_STOR_TRANSPORT_FAILED;
- break;
- }
- return USB_STOR_TRANSPORT_GOOD;
- US_DEBUGP("Freecom: transfer_length = %dn",
- usb_stor_transfer_length (srb));
- US_DEBUGP("Freecom: direction = %dn", srb->sc_data_direction);
- return USB_STOR_TRANSPORT_ERROR;
- }
- int
- freecom_init (struct us_data *us)
- {
- int result;
- char buffer[33];
- /* Allocate a buffer for us. The upper usb transport code will
- * free this for us when cleaning up. */
- if (us->extra == NULL) {
- us->extra = kmalloc (sizeof (struct freecom_udata),
- GFP_KERNEL);
- if (us->extra == NULL) {
- US_DEBUGP("Out of memoryn");
- return USB_STOR_TRANSPORT_ERROR;
- }
- }
- result = usb_control_msg(us->pusb_dev,
- usb_rcvctrlpipe(us->pusb_dev, 0),
- 0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
- buffer[32] = ' ';
- US_DEBUGP("String returned from FC init is: %sn", 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_control_msg(us->pusb_dev,
- usb_sndctrlpipe(us->pusb_dev, 0),
- 0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
- US_DEBUGP("result from activate reset is %dn", result);
- /* wait 250ms */
- mdelay(250);
- /* clear reset */
- result = usb_control_msg(us->pusb_dev,
- usb_sndctrlpipe(us->pusb_dev, 0),
- 0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
- US_DEBUGP("result from clear reset is %dn", 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 calledn");
- /* 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("%sn", 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("%sn", line);
- offset = 0;
- }
- #endif