/*
* Transport for the Sandisk SDDR-55
*/
int sddr55_transport(Scsi_Cmnd *srb, struct us_data *us)
{
int result;
int i;
unsigned char inquiry_response[36] = {
0x00, 0x80, 0x00, 0x02, 0x1F, 0x00, 0x00, 0x00
};
unsigned char mode_page_01[16] = { // write-protected for now
0x03, 0x00, 0x80, 0x00,
0x01, 0x0A,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
unsigned char *ptr;
unsigned long capacity;
unsigned int lba;
unsigned int pba;
unsigned int page;
unsigned short pages;
struct sddr55_card_info *info;
if (!us->extra) {
us->extra = kmalloc(
sizeof(struct sddr55_card_info), GFP_NOIO);
if (!us->extra)
return USB_STOR_TRANSPORT_ERROR;
memset(us->extra, 0, sizeof(struct sddr55_card_info));
us->extra_destructor = sddr55_card_info_destructor;
}
info = (struct sddr55_card_info *)(us->extra);
ptr = (unsigned char *)srb->request_buffer;
if (srb->cmnd[0] == REQUEST_SENSE) {
i = srb->cmnd[4];
if (i > sizeof info->sense_data)
i = sizeof info->sense_data;
US_DEBUGP("SDDR55: request sense %02x/%02x/%02x\n", info->sense_data[2], info->sense_data[12], info->sense_data[13]);
info->sense_data[0] = 0x70;
info->sense_data[7] = 10;
memcpy (ptr, info->sense_data, i);
memset (info->sense_data, 0, sizeof info->sense_data);
return USB_STOR_TRANSPORT_GOOD;
}
memset (info->sense_data, 0, sizeof info->sense_data);
/* Dummy up a response for INQUIRY since SDDR55 doesn't
respond to INQUIRY commands */
if (srb->cmnd[0] == INQUIRY) {
memset(inquiry_response+8, 0, 28);
fill_inquiry_response(us, inquiry_response, 36);
return USB_STOR_TRANSPORT_GOOD;
}
/* only check card status if the map isn't allocated, ie no card seen yet
* or if it's been over half a second since we last accessed it
*/
if (info->lba_to_pba == NULL || time_after(jiffies, info->last_access + HZ/2)) {
/* check to see if a card is fitted */
result = sddr55_status (us);
if (result) {
result = sddr55_status (us);
if (!result) {
set_sense_info (6, 0x28, 0); /* new media, set unit attention, not ready to ready */
}
return USB_STOR_TRANSPORT_FAILED;
}
}
/* if we detected a problem with the map when writing, don't allow any more access */
if (info->fatal_error) {
set_sense_info (3, 0x31, 0);
return USB_STOR_TRANSPORT_FAILED;
}
if (srb->cmnd[0] == READ_CAPACITY) {
capacity = sddr55_get_capacity(us);
if (!capacity) {
set_sense_info (3, 0x30, 0); /* incompatible medium */
return USB_STOR_TRANSPORT_FAILED;
}
info->capacity = capacity;
/* figure out the maximum logical block number, allowing for the fact
* that only 250 out of every 256 are used */
info->max_log_blks = ((info->capacity >> (info->pageshift + info->blockshift)) / 256) * 250;
/* Last page in the card, adjust as we only use 250 out of every 256 pages */
capacity = (capacity / 256) * 250;
capacity /= PAGESIZE;
capacity--;
ptr[0] = MSB_of(capacity>>16);
ptr[1] = LSB_of(capacity>>16);
ptr[2] = MSB_of(capacity&0xFFFF);
ptr[3] = LSB_of(capacity&0xFFFF);
// The page size
ptr[4] = MSB_of(PAGESIZE>>16);
ptr[5] = LSB_of(PAGESIZE>>16);
ptr[6] = MSB_of(PAGESIZE&0xFFFF);
ptr[7] = LSB_of(PAGESIZE&0xFFFF);
sddr55_read_map(us);
return USB_STOR_TRANSPORT_GOOD;
}
static int sddr55_write_data(struct us_data *us,
unsigned int lba,
unsigned int page,
unsigned short sectors,
unsigned char *content,
int use_sg) {
int result;
unsigned char command[8] = {
0, 0, 0, 0, 0, 0xb0, 0, 0x86
};
unsigned char status[8];
struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
unsigned int pba;
unsigned int new_pba;
unsigned long address;
unsigned short pages;
unsigned char *buffer = NULL;
unsigned char *ptr;
struct scatterlist *sg = NULL;
int i;
int len;
int transferred;
/* check if we are allowed to write */
if (info->read_only || info->force_read_only) {
set_sense_info (7, 0x27, 0); /* read only */
return USB_STOR_TRANSPORT_FAILED;
}
// If we're using scatter-gather, we have to create a new
// buffer to write all of the data in first, since a
// scatter-gather buffer could in theory start in the middle
// of a page, which would be bad. A developer who wants a
// challenge might want to write a limited-buffer
// version of this code.
len = sectors * PAGESIZE;
if (use_sg) {
sg = (struct scatterlist *)content;
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR;
transferred = 0;
for (i=0; i<use_sg && transferred<len; i++) {
memcpy(buffer+transferred, sg[i].address,
len-transferred > sg[i].length ?
sg[i].length : len-transferred);
transferred += sg[i].length;
}
ptr = buffer;
} else
ptr = content;
while (sectors > 0) {
/* have we got to end? */
if (lba >= info->max_log_blks)
break;
pba = info->lba_to_pba[lba];
// Write as many sectors as possible in this block
pages = info->blocksize - page;
if (pages > (sectors << info->smallpageshift))
pages = (sectors << info->smallpageshift);
US_DEBUGP("Write %02X pages, to PBA %04X"
" (LBA %04X) page %02X\n",
pages, pba, lba, page);
command[4] = 0;
if (pba == NOT_ALLOCATED) {
/* no pba allocated for this lba, find a free pba to use */
int max_pba = (info->max_log_blks / 250 ) * 256;
int found_count = 0;
int found_pba = -1;
/* set pba to first block in zone lba is in */
pba = (lba / 1000) * 1024;
US_DEBUGP("No PBA for LBA %04X\n",lba);
if (max_pba > 1024)
max_pba = 1024;
/* scan through the map lookiong for an unused block
* leave 16 unused blocks at start (or as many as possible)
* since the sddr55 seems to reuse a used block when it shouldn't
* if we don't leave space */
for (i = 0; i < max_pba; i++, pba++) {
if (info->pba_to_lba[pba] == UNUSED_BLOCK) {
found_pba = pba;
if (found_count++ > 16)
break;
}
}
pba = found_pba;
if (pba == -1) {
/* oh dear, couldn't find an unallocated block */
US_DEBUGP("Couldn't find unallocated block\n");
set_sense_info (3, 0x31, 0); /* medium error */
if (use_sg)
kfree(buffer);
return USB_STOR_TRANSPORT_FAILED;
}
US_DEBUGP("Allocating PBA %04X for LBA %04X\n", pba, lba);
/* set writing to unallocated block flag */
command[4] = 0x40;
}
address = (pba << info->blockshift) + page;
command[1] = LSB_of(address>>16);
command[2] = LSB_of(address>>8);
command[3] = LSB_of(address);
/* set the lba into the command, modulo 1000 */
command[0] = LSB_of(lba % 1000);
command[6] = MSB_of(lba % 1000);
command[4] |= LSB_of(pages >> info->smallpageshift);
/* send command */
result = sddr55_bulk_transport(us,
SCSI_DATA_WRITE, command, 8);
if (result != US_BULK_TRANSFER_GOOD) {
US_DEBUGP("Result for send_command in write_data %d\n",
result);
set_sense_info (3, 0x3, 0); /* peripheral write error */
if (use_sg)
kfree(buffer);
return result;
}
/* send the data */
result = sddr55_bulk_transport(us,
SCSI_DATA_WRITE, ptr,
pages<<info->pageshift);
if (result != US_BULK_TRANSFER_GOOD) {
US_DEBUGP("Result for send_data in write_data %d\n",
result);
set_sense_info (3, 0x3, 0); /* peripheral write error */
if (use_sg)
kfree(buffer);
return result;
}
/* now read status */
result = sddr55_bulk_transport(us,
SCSI_DATA_READ, status, 6);
if (result != US_BULK_TRANSFER_GOOD) {
US_DEBUGP("Result for get_status in write_data %d\n",
result);
set_sense_info (3, 0x3, 0); /* peripheral write error */
if (use_sg)
kfree(buffer);
return result;
}
new_pba = (status[3] + (status[4] << 8) + (status[5] << 16)) >> info->blockshift;
/* check status for error */
if (status[0] == 0xff && status[1] == 0x4) {
set_sense_info (3, 0x0c, 0);
if (use_sg)
kfree(buffer);
info->pba_to_lba[new_pba] = BAD_BLOCK;
return USB_STOR_TRANSPORT_FAILED;
}
US_DEBUGP("Updating maps for LBA %04X: old PBA %04X, new PBA %04X\n",
lba, pba, new_pba);
/* update the lba<->pba maps, note new_pba might be the same as pba */
info->lba_to_pba[lba] = new_pba;
info->pba_to_lba[pba] = UNUSED_BLOCK;
/* check that new_pba wasn't already being used */
if (info->pba_to_lba[new_pba] != UNUSED_BLOCK) {
printk(KERN_ERR "sddr55 error: new PBA %04X already in use for LBA %04X\n",
new_pba, info->pba_to_lba[new_pba]);
info->fatal_error = 1;
set_sense_info (3, 0x31, 0);
if (use_sg)
kfree(buffer);
return USB_STOR_TRANSPORT_FAILED;
}
/* update the pba<->lba maps for new_pba */
info->pba_to_lba[new_pba] = lba % 1000;
page = 0;
lba++;
sectors -= pages >> info->smallpageshift;
ptr += (pages << info->pageshift);
}
if (use_sg) {
kfree(buffer);
}
return USB_STOR_TRANSPORT_GOOD;
}
static int sddr55_write_data(struct us_data *us,
unsigned int lba,
unsigned int page,
unsigned short sectors) {
int result = USB_STOR_TRANSPORT_GOOD;
unsigned char *command = us->iobuf;
unsigned char *status = us->iobuf;
struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
unsigned char *buffer;
unsigned int pba;
unsigned int new_pba;
unsigned long address;
unsigned short pages;
int i;
unsigned int len, offset;
struct scatterlist *sg;
/* check if we are allowed to write */
if (info->read_only || info->force_read_only) {
set_sense_info (7, 0x27, 0); /* read only */
return USB_STOR_TRANSPORT_FAILED;
}
// Since we only write one block at a time, we have to create
// a bounce buffer and move the data a piece at a time between the
// bounce buffer and the actual transfer buffer.
len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
info->smallpageshift) * PAGESIZE;
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR;
offset = 0;
sg = NULL;
while (sectors > 0) {
/* have we got to end? */
if (lba >= info->max_log_blks)
break;
pba = info->lba_to_pba[lba];
// Write as many sectors as possible in this block
pages = min((unsigned int) sectors << info->smallpageshift,
info->blocksize - page);
len = pages << info->pageshift;
// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
&sg, &offset, FROM_XFER_BUF);
US_DEBUGP("Write %02X pages, to PBA %04X"
" (LBA %04X) page %02X\n",
pages, pba, lba, page);
command[4] = 0;
if (pba == NOT_ALLOCATED) {
/* no pba allocated for this lba, find a free pba to use */
int max_pba = (info->max_log_blks / 250 ) * 256;
int found_count = 0;
int found_pba = -1;
/* set pba to first block in zone lba is in */
pba = (lba / 1000) * 1024;
US_DEBUGP("No PBA for LBA %04X\n",lba);
if (max_pba > 1024)
max_pba = 1024;
/*
* Scan through the map looking for an unused block
* leave 16 unused blocks at start (or as many as
* possible) since the sddr55 seems to reuse a used
* block when it shouldn't if we don't leave space.
*/
for (i = 0; i < max_pba; i++, pba++) {
if (info->pba_to_lba[pba] == UNUSED_BLOCK) {
found_pba = pba;
if (found_count++ > 16)
break;
}
}
pba = found_pba;
if (pba == -1) {
/* oh dear */
US_DEBUGP("Couldn't find unallocated block\n");
set_sense_info (3, 0x31, 0); /* medium error */
result = USB_STOR_TRANSPORT_FAILED;
goto leave;
}
US_DEBUGP("Allocating PBA %04X for LBA %04X\n", pba, lba);
/* set writing to unallocated block flag */
command[4] = 0x40;
}
address = (pba << info->blockshift) + page;
command[1] = LSB_of(address>>16);
command[2] = LSB_of(address>>8);
command[3] = LSB_of(address);
/* set the lba into the command, modulo 1000 */
command[0] = LSB_of(lba % 1000);
command[6] = MSB_of(lba % 1000);
command[4] |= LSB_of(pages >> info->smallpageshift);
command[5] = 0xB0;
command[7] = 0x86;
/* send command */
result = sddr55_bulk_transport(us,
DMA_TO_DEVICE, command, 8);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP("Result for send_command in write_data %d\n",
result);
/* set_sense_info is superfluous here? */
set_sense_info (3, 0x3, 0);/* peripheral write error */
result = USB_STOR_TRANSPORT_FAILED;
goto leave;
}
/* send the data */
result = sddr55_bulk_transport(us,
DMA_TO_DEVICE, buffer, len);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP("Result for send_data in write_data %d\n",
result);
/* set_sense_info is superfluous here? */
set_sense_info (3, 0x3, 0);/* peripheral write error */
result = USB_STOR_TRANSPORT_FAILED;
goto leave;
}
/* now read status */
result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, status, 6);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP("Result for get_status in write_data %d\n",
result);
/* set_sense_info is superfluous here? */
set_sense_info (3, 0x3, 0);/* peripheral write error */
result = USB_STOR_TRANSPORT_FAILED;
goto leave;
}
new_pba = (status[3] + (status[4] << 8) + (status[5] << 16))
>> info->blockshift;
/* check status for error */
if (status[0] == 0xff && status[1] == 0x4) {
info->pba_to_lba[new_pba] = BAD_BLOCK;
set_sense_info (3, 0x0c, 0);
result = USB_STOR_TRANSPORT_FAILED;
goto leave;
}
US_DEBUGP("Updating maps for LBA %04X: old PBA %04X, new PBA %04X\n",
lba, pba, new_pba);
/* update the lba<->pba maps, note new_pba might be the same as pba */
info->lba_to_pba[lba] = new_pba;
info->pba_to_lba[pba] = UNUSED_BLOCK;
/* check that new_pba wasn't already being used */
if (info->pba_to_lba[new_pba] != UNUSED_BLOCK) {
printk(KERN_ERR "sddr55 error: new PBA %04X already in use for LBA %04X\n",
new_pba, info->pba_to_lba[new_pba]);
info->fatal_error = 1;
set_sense_info (3, 0x31, 0);
result = USB_STOR_TRANSPORT_FAILED;
goto leave;
}
/* update the pba<->lba maps for new_pba */
info->pba_to_lba[new_pba] = lba % 1000;
page = 0;
lba++;
sectors -= pages >> info->smallpageshift;
}
result = USB_STOR_TRANSPORT_GOOD;
leave:
kfree(buffer);
return result;
}
static int sddr55_read_data(struct us_data *us,
unsigned int lba,
unsigned int page,
unsigned short sectors,
unsigned char *content,
int use_sg) {
int result;
unsigned char command[8] = {
0, 0, 0, 0, 0, 0xb0, 0, 0x85
};
unsigned char status[8];
struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
unsigned int pba;
unsigned long address;
unsigned short pages;
unsigned char *buffer = NULL;
unsigned char *ptr;
struct scatterlist *sg = NULL;
int i;
int len;
int transferred;
// If we're using scatter-gather, we have to create a new
// buffer to read all of the data in first, since a
// scatter-gather buffer could in theory start in the middle
// of a page, which would be bad. A developer who wants a
// challenge might want to write a limited-buffer
// version of this code.
len = sectors * PAGESIZE;
if (use_sg) {
sg = (struct scatterlist *)content;
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR;
ptr = buffer;
} else
ptr = content;
// This could be made much more efficient by checking for
// contiguous LBA's. Another exercise left to the student.
while (sectors>0) {
/* have we got to end? */
if (lba >= info->max_log_blks)
break;
pba = info->lba_to_pba[lba];
// Read as many sectors as possible in this block
pages = info->blocksize - page;
if (pages > (sectors << info->smallpageshift))
pages = (sectors << info->smallpageshift);
US_DEBUGP("Read %02X pages, from PBA %04X"
" (LBA %04X) page %02X\n",
pages, pba, lba, page);
if (pba == NOT_ALLOCATED) {
/* no pba for this lba, fill with zeroes */
memset (ptr, 0, pages << info->pageshift);
} else {
address = (pba << info->blockshift) + page;
command[1] = LSB_of(address>>16);
command[2] = LSB_of(address>>8);
command[3] = LSB_of(address);
command[6] = LSB_of(pages << (1 - info->smallpageshift));
/* send command */
result = sddr55_bulk_transport(us,
SCSI_DATA_WRITE, command, 8);
US_DEBUGP("Result for send_command in read_data %d\n",
result);
if (result != US_BULK_TRANSFER_GOOD) {
if (use_sg)
kfree(buffer);
return result;
}
/* read data */
result = sddr55_bulk_transport(us,
SCSI_DATA_READ, ptr,
pages<<info->pageshift);
if (result != US_BULK_TRANSFER_GOOD) {
if (use_sg)
kfree(buffer);
return result;
}
/* now read status */
result = sddr55_bulk_transport(us,
SCSI_DATA_READ, status, 2);
if (result != US_BULK_TRANSFER_GOOD) {
if (use_sg)
kfree(buffer);
return result;
}
/* check status for error */
if (status[0] == 0xff && status[1] == 0x4) {
set_sense_info (3, 0x11, 0);
if (use_sg)
kfree(buffer);
return USB_STOR_TRANSPORT_FAILED;
}
}
page = 0;
lba++;
sectors -= pages >> info->smallpageshift;
ptr += (pages << info->pageshift);
}
if (use_sg) {
transferred = 0;
for (i=0; i<use_sg && transferred<len; i++) {
memcpy(sg[i].address, buffer+transferred,
len-transferred > sg[i].length ?
sg[i].length : len-transferred);
transferred += sg[i].length;
}
kfree(buffer);
}
return USB_STOR_TRANSPORT_GOOD;
}
static int sddr55_read_data(struct us_data *us,
unsigned int lba,
unsigned int page,
unsigned short sectors) {
int result = USB_STOR_TRANSPORT_GOOD;
unsigned char *command = us->iobuf;
unsigned char *status = us->iobuf;
struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
unsigned char *buffer;
unsigned int pba;
unsigned long address;
unsigned short pages;
unsigned int len, offset;
struct scatterlist *sg;
// Since we only read in one block at a time, we have to create
// a bounce buffer and move the data a piece at a time between the
// bounce buffer and the actual transfer buffer.
len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
info->smallpageshift) * PAGESIZE;
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR; /* out of memory */
offset = 0;
sg = NULL;
while (sectors>0) {
/* have we got to end? */
if (lba >= info->max_log_blks)
break;
pba = info->lba_to_pba[lba];
// Read as many sectors as possible in this block
pages = min((unsigned int) sectors << info->smallpageshift,
info->blocksize - page);
len = pages << info->pageshift;
US_DEBUGP("Read %02X pages, from PBA %04X"
" (LBA %04X) page %02X\n",
pages, pba, lba, page);
if (pba == NOT_ALLOCATED) {
/* no pba for this lba, fill with zeroes */
memset (buffer, 0, len);
} else {
address = (pba << info->blockshift) + page;
command[0] = 0;
command[1] = LSB_of(address>>16);
command[2] = LSB_of(address>>8);
command[3] = LSB_of(address);
command[4] = 0;
command[5] = 0xB0;
command[6] = LSB_of(pages << (1 - info->smallpageshift));
command[7] = 0x85;
/* send command */
result = sddr55_bulk_transport(us,
DMA_TO_DEVICE, command, 8);
US_DEBUGP("Result for send_command in read_data %d\n",
result);
if (result != USB_STOR_XFER_GOOD) {
result = USB_STOR_TRANSPORT_ERROR;
goto leave;
}
/* read data */
result = sddr55_bulk_transport(us,
DMA_FROM_DEVICE, buffer, len);
if (result != USB_STOR_XFER_GOOD) {
result = USB_STOR_TRANSPORT_ERROR;
goto leave;
}
/* now read status */
result = sddr55_bulk_transport(us,
DMA_FROM_DEVICE, status, 2);
if (result != USB_STOR_XFER_GOOD) {
result = USB_STOR_TRANSPORT_ERROR;
goto leave;
}
/* check status for error */
if (status[0] == 0xff && status[1] == 0x4) {
set_sense_info (3, 0x11, 0);
result = USB_STOR_TRANSPORT_FAILED;
goto leave;
}
}
// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
&sg, &offset, TO_XFER_BUF);
page = 0;
lba++;
sectors -= pages >> info->smallpageshift;
}
result = USB_STOR_TRANSPORT_GOOD;
leave:
kfree(buffer);
return result;
}
