/*
* Performs a read request for SDHC.
*/
static int sdhc_read_request(struct sd_host *host, struct request *req)
{
int i;
unsigned long nr_blocks; /* in card blocks */
size_t block_len; /* in bytes */
unsigned long start;
void *buf = req->buffer;
int retval;
start = blk_rq_pos(req);
nr_blocks = blk_rq_cur_sectors(req);
block_len = 1 << KERNEL_SECTOR_SHIFT;
for (i = 0; i < nr_blocks; i++) {
retval = sd_read_single_block(host, start, buf, block_len);
if (retval < 0)
break;
start ++;
buf += block_len;
}
/* number of kernel sectors transferred */
retval = i;
return retval;
}
DRESULT disk_read (BYTE pdrv, BYTE* buff, DWORD sector, UINT count)
{
DRESULT result;
if (pdrv >= N_PDRV)
{
result = RES_ERROR;
}
else if (!pdrv_data[pdrv].initialized)
{
result = RES_NOTRDY;
}
else if (!pdrv_data[pdrv].present)
{
result = RES_ERROR;
}
else
{
while (count > 0)
{
uint32_t addr;
int read_res;
addr = get_addr(sector, pdrv_data[pdrv].byte_addressable);
read_res = sd_read_single_block(addr, buff);
if (read_res != 0)
{
break;
}
buff += SD_SECTOR_SIZE;
sector++;
count--;
}
if (count > 0)
{
result = RES_ERROR;
}
else
{
result = RES_OK;
}
}
return result;
}
/*
* Performs a read request.
*/
static int sd_read_request(struct sd_host *host, struct request *req)
{
int i;
unsigned long nr_blocks; /* in card blocks */
size_t block_len; /* in bytes */
unsigned long start;
void *buf = req->buffer;
int retval;
/*
* It seems that some cards do not accept single block reads for the
* read block length reported by the card.
* For now, we perform only 512 byte single block reads.
*/
start = blk_rq_pos(req) << KERNEL_SECTOR_SHIFT;
#if 0
nr_blocks = req->current_nr_sectors >>
(host->card.csd.read_blkbits - KERNEL_SECTOR_SHIFT);
block_len = 1 << host->card.csd.read_blkbits;
#else
nr_blocks = blk_rq_cur_sectors(req);
block_len = 1 << KERNEL_SECTOR_SHIFT;
#endif
for (i = 0; i < nr_blocks; i++) {
retval = sd_read_single_block(host, start, buf, block_len);
if (retval < 0)
break;
start += block_len;
buf += block_len;
}
/* number of kernel sectors transferred */
#if 0
retval = i << (host->card.csd.read_blkbits - KERNEL_SECTOR_SHIFT);
#else
retval = i;
#endif
return retval;
}
scsi_cmdret_t scsi_sd_read10( SCSI_PARAMS )
{
const sdio_t *sdio = (const sdio_t*)scsi_lun[lun].info;
scsi_cdb10_t *cdb10 = (scsi_cdb10_t *)cmd;
//uint8_t DPO = (cdb10->cdb_info >> 4) & 0x1;
//uint8_t FUA = (cdb10->cdb_info >> 3) & 0x1;
uint32_t lba = msbtohost32(cdb10->lba);
uint32_t nblocks = msbtohost16(cdb10->length);
uint32_t sdsize = sd_get_size(*sdio);
sd_card_type_t sdtype = sd_get_type(*sdio);
sd_error_t sdret;
scsi_cmdret_t ret;
uint32_t la = (sdtype != SDHC) ? lba * BLOCKSIZE : lba;
sdret = SD_NO_ERROR;
sd_transfer_ended = false;
sd_set_transfer_handler(*sdio, sd_transfer_handler);
if ((lba + nblocks - 1) >= sdsize)
{
log_error("SCSI Read(10), read beyond limit (limit 0x%08x, request 0x%08x / +%d)",sdsize,lba,nblocks);
*status = SCSI_CHECK_CONDITION;
return SCSI_CMD_DONE;
}
if (datamax < BLOCKSIZE)
{
log_error("SCSI Read(10), read buffer is smaller than a single sector (%d/%d bytes)",datalen,BLOCKSIZE);
*status = SCSI_CHECK_CONDITION;
return SCSI_CMD_ERROR;
}
sdret = sd_read_single_block(*sdio, la, data);
if (cont == 0)
{
log_info("SCSI Read(10) type %d, lba 0x%08x, length %d",sdtype,lba,nblocks);
}
else
{
DBG("-%d-\n",cont);
}
if (sdret != SD_NO_ERROR)
{
log_error("SCSI Read Command Error on SD %d",sdret);
*status = SCSI_CHECK_CONDITION;
return SCSI_CMD_DONE;
}
while (!sd_transfer_ended)
{
;
}
sdret = sd_get_status(*sdio);
if (sdret != SD_NO_ERROR)
{
log_error("SCSI Read Error on SD (lba 0x%08x) ret %d",lba,sdret);
*status = SCSI_CHECK_CONDITION;
return SCSI_CMD_DONE;
}
switch (nblocks)
{
case 0:
*status = SCSI_CHECK_CONDITION;
ret = SCSI_CMD_ERROR;
break;
case 1:
*datalen = BLOCKSIZE;
*status = SCSI_GOOD;
ret = SCSI_CMD_DONE;
break;
default:
cdb10->lba = msbtohost32( lba + 1 );
cdb10->length = msbtohost16( nblocks - 1 );
*datalen = BLOCKSIZE;
*status = SCSI_GOOD;
ret = SCSI_CMD_PARTIAL;
break;
}
return ret;
}