diff options
| author | Faiz Abbas <faiz_abbas@ti.com> | 2019-10-15 18:24:33 +0530 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2019-10-23 20:47:12 -0400 |
| commit | 4ff572830eb1ae95fa85f8ab585521ccc1d86845 (patch) | |
| tree | 5d344679a98ec497740c45e8e8f15907ed2f3580 /drivers/scsi | |
| parent | 66c54f1a3e467e25093253020a75f6b288b7281f (diff) | |
| download | u-boot-4ff572830eb1ae95fa85f8ab585521ccc1d86845.tar.gz | |
scsi: Add max_bytes_per_req to scsi_platdata
Add max_bytes_per_req to scsi_platdata to enable the host driver to limit
the number of bytes that can be read/written per request.
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi.c | 45 |
1 files changed, 26 insertions, 19 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 1b9f25ac33..e55bb256a9 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -45,7 +45,7 @@ static struct blk_desc scsi_dev_desc[CONFIG_SYS_SCSI_MAX_DEVICE]; #endif /* almost the maximum amount of the scsi_ext command.. */ -#define SCSI_MAX_READ_BLK 0xFFFF +#define SCSI_MAX_BLK 0xFFFF #define SCSI_LBA48_READ 0xFFFFFFF static void scsi_print_error(struct scsi_cmd *pccb) @@ -147,7 +147,8 @@ static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, { struct blk_desc *block_dev = dev_get_uclass_platdata(dev); struct udevice *bdev = dev->parent; - lbaint_t start, blks; + struct scsi_platdata *uc_plat = dev_get_uclass_platdata(bdev); + lbaint_t start, blks, max_blks; uintptr_t buf_addr; unsigned short smallblks = 0; struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb; @@ -158,6 +159,11 @@ static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, buf_addr = (unsigned long)buffer; start = blknr; blks = blkcnt; + if (uc_plat->max_bytes_per_req) + max_blks = uc_plat->max_bytes_per_req / block_dev->blksz; + else + max_blks = SCSI_MAX_BLK; + debug("\nscsi_read: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n", block_dev->devnum, start, blks, (unsigned long)buffer); @@ -166,20 +172,19 @@ static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, #ifdef CONFIG_SYS_64BIT_LBA if (start > SCSI_LBA48_READ) { unsigned long blocks; - blocks = min_t(lbaint_t, blks, SCSI_MAX_READ_BLK); + blocks = min_t(lbaint_t, blks, max_blks); pccb->datalen = block_dev->blksz * blocks; scsi_setup_read16(pccb, start, blocks); start += blocks; blks -= blocks; } else #endif - if (blks > SCSI_MAX_READ_BLK) { - pccb->datalen = block_dev->blksz * - SCSI_MAX_READ_BLK; - smallblks = SCSI_MAX_READ_BLK; + if (blks > max_blks) { + pccb->datalen = block_dev->blksz * max_blks; + smallblks = max_blks; scsi_setup_read_ext(pccb, start, smallblks); - start += SCSI_MAX_READ_BLK; - blks -= SCSI_MAX_READ_BLK; + start += max_blks; + blks -= max_blks; } else { pccb->datalen = block_dev->blksz * blks; smallblks = (unsigned short)blks; @@ -206,15 +211,13 @@ static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, * scsi_write */ -/* Almost the maximum amount of the scsi_ext command.. */ -#define SCSI_MAX_WRITE_BLK 0xFFFF - static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, const void *buffer) { struct blk_desc *block_dev = dev_get_uclass_platdata(dev); struct udevice *bdev = dev->parent; - lbaint_t start, blks; + struct scsi_platdata *uc_plat = dev_get_uclass_platdata(bdev); + lbaint_t start, blks, max_blks; uintptr_t buf_addr; unsigned short smallblks; struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb; @@ -225,17 +228,21 @@ static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt, buf_addr = (unsigned long)buffer; start = blknr; blks = blkcnt; + if (uc_plat->max_bytes_per_req) + max_blks = uc_plat->max_bytes_per_req / block_dev->blksz; + else + max_blks = SCSI_MAX_BLK; + debug("\n%s: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n", __func__, block_dev->devnum, start, blks, (unsigned long)buffer); do { pccb->pdata = (unsigned char *)buf_addr; - if (blks > SCSI_MAX_WRITE_BLK) { - pccb->datalen = (block_dev->blksz * - SCSI_MAX_WRITE_BLK); - smallblks = SCSI_MAX_WRITE_BLK; + if (blks > max_blks) { + pccb->datalen = block_dev->blksz * max_blks; + smallblks = max_blks; scsi_setup_write_ext(pccb, start, smallblks); - start += SCSI_MAX_WRITE_BLK; - blks -= SCSI_MAX_WRITE_BLK; + start += max_blks; + blks -= max_blks; } else { pccb->datalen = block_dev->blksz * blks; smallblks = (unsigned short)blks; |