/*
* 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 STARTED\n");
/* Get handles for both transports. */
opipe = usb_sndbulkpipe (us->pusb_dev, us->ep_out);
ipipe = usb_rcvbulkpipe (us->pusb_dev, us->ep_in);
#if 0
/* Yuck, let's see if this helps us. Artificially increase the
* length on this. */
if (srb->cmnd[0] == 0x03 && srb->cmnd[4] == 0x12)
srb->cmnd[4] = 0x0E;
#endif
/* 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=%d\n",
result, partial);
/* -ENOENT -- we canceled this transfer */
if (result == -ENOENT) {
US_DEBUGP("freecom_transport(): transfer aborted\n");
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 %d\n", result, partial);
/* -ENOENT -- we canceled this transfer */
if (result == -ENOENT) {
US_DEBUGP("freecom_transport(): transfer aborted\n");
return US_BULK_TRANSFER_ABORTED;
}
US_DEBUG(pdump ((void *) fst, partial));
/* while we haven't recieved the IRQ */
while (!(fst->Status & 0x2)) {
/* send a command to re-fetch the status */
US_DEBUGP("Re-attempting to get status...\n");
fcb->Type = FCM_PACKET_STATUS;
fcb->Timeout = 0;
memset (fcb->Atapi, 0, 12);
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=%d\n",
result, partial);
/* -ENOENT -- we canceled this transfer */
if (result == -ENOENT) {
US_DEBUGP("freecom_transport(): transfer aborted\n");
return US_BULK_TRANSFER_ABORTED;
}
return USB_STOR_TRANSPORT_ERROR;
}
/* actually get the status info */
result = usb_stor_bulk_msg (us, fst, ipipe,
FCM_PACKET_LENGTH, &partial);
US_DEBUGP("bar Status result %d %d\n", result, partial);
/* -ENOENT -- we canceled this transfer */
if (result == -ENOENT) {
US_DEBUGP("freecom_transport(): transfer aborted\n");
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 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));
/* Find the length we desire to read. It is the lesser of the SCSI
* layer's requested length, and the length the device claims to
* have available. */
length = usb_stor_transfer_length (srb);
US_DEBUGP("SCSI requested %d\n", length);
if (length > le16_to_cpu (fst->Count))
length = le16_to_cpu (fst->Count);
/* 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 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_msg (us, fst, ipipe,
FCM_PACKET_LENGTH, &partial);
US_DEBUG(pdump ((void *) fst, partial));
if (result == -ENOENT) {
US_DEBUGP ("freecom_transport: transfer aborted\n");
return US_BULK_TRANSFER_ABORTED;
}
if (partial != 4 || result != 0)
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 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;
#if 1
US_DEBUGP("FCM: Waiting for status\n");
result = usb_stor_bulk_msg (us, fst, ipipe,
FCM_PACKET_LENGTH, &partial);
if (result == -ENOENT) {
US_DEBUGP ("freecom_transport: transfer aborted\n");
return US_BULK_TRANSFER_ABORTED;
}
if (partial != 4 || result != 0)
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;
}
#endif
US_DEBUGP("Transfer happy\n");
break;
case SCSI_DATA_NONE:
/* Easy, do nothing. */
break;
default:
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;
US_DEBUGP("Freecom: transfer_length = %d\n",
usb_stor_transfer_length (srb));
US_DEBUGP("Freecom: direction = %d\n", srb->sc_data_direction);
return USB_STOR_TRANSPORT_ERROR;
}
/*
* Transport for the Freecom USB/IDE adaptor.
*
*/
static 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", scsi_bufflen(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 = le16_to_cpu(fst->Count);
break;
default:
length = scsi_bufflen(srb);
}
/* verify that this amount is legal */
if (length > scsi_bufflen(srb)) {
length = scsi_bufflen(srb);
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;
}
static int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
{
struct freecom_cb_wrap *fcb;
struct freecom_status *fst;
unsigned int ipipe, opipe;
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");
opipe = us->send_bulk_pipe;
ipipe = us->recv_bulk_pipe;
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));
result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
FCM_PACKET_LENGTH, NULL);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP ("freecom transport error\n");
return USB_STOR_TRANSPORT_ERROR;
}
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));
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);
fcb->Type = FCM_PACKET_STATUS;
fcb->Timeout = 0;
memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
memset (fcb->Filler, 0, sizeof (fcb->Filler));
result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
FCM_PACKET_LENGTH, NULL);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP ("freecom transport error\n");
return USB_STOR_TRANSPORT_ERROR;
}
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;
}
US_DEBUGP("Device indicates that it has %d bytes available\n",
le16_to_cpu (fst->Count));
US_DEBUGP("SCSI requested %d\n", scsi_bufflen(srb));
switch (srb->cmnd[0]) {
case INQUIRY:
case REQUEST_SENSE:
case MODE_SENSE:
case MODE_SENSE_10:
length = le16_to_cpu(fst->Count);
break;
default:
length = scsi_bufflen(srb);
}
if (length > scsi_bufflen(srb)) {
length = scsi_bufflen(srb);
US_DEBUGP("Truncating request to match buffer length: %d\n", length);
}
switch (us->srb->sc_data_direction) {
case DMA_FROM_DEVICE:
if (!length)
break;
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:
if (!length)
break;
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:
break;
default:
US_DEBUGP ("freecom unimplemented direction: %d\n",
us->srb->sc_data_direction);
return USB_STOR_TRANSPORT_FAILED;
break;
}
return USB_STOR_TRANSPORT_GOOD;
}
