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[PATCH] libata irq-pio: add read/write multiple support 

- add is_multi_taskfile() to ata.h
   - initialize ata_device->multi_count with device identify data
   - use ata_pio_sectors() to support r/w multiple commands

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>

========
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Albert Lee 2005-11-01 19:33:20 +08:00 committed by Jeff Garzik
parent fbcdd80b0d
commit 07f6f7d074
2 changed files with 46 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/scsi/libata-core.c
View File

@ -1261,6 +1261,12 @@ retry:
}
if (dev->id[59] & 0x100) {
dev->multi_count = dev->id[59] & 0xff;
DPRINTK("ata%u: dev %u multi count %u\n",
ap->id, device, dev->multi_count);
}
ap->host->max_cmd_len = 16;
}
@ -2804,7 +2810,7 @@ static int ata_pio_complete (struct ata_port *ap)
* we enter, BSY will be cleared in a chk-status or two. If not,
* the drive is probably seeking or something. Snooze for a couple
* msecs, then chk-status again. If still busy, fall back to
* HSM_ST_POLL state.
* HSM_ST_LAST_POLL state.
*/
drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 10);
if (drv_stat & (ATA_BUSY | ATA_DRQ)) {
@ -3020,6 +3026,32 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
}
}
/**
* ata_pio_sectors - Transfer one or many 512-byte sectors.
* @qc: Command on going
*
* Transfer one or many ATA_SECT_SIZE of data from/to the
* ATA device for the DRQ request.
*
* LOCKING:
* Inherited from caller.
*/
static void ata_pio_sectors(struct ata_queued_cmd *qc)
{
if (is_multi_taskfile(&qc->tf)) {
/* READ/WRITE MULTIPLE */
unsigned int nsect;
assert(qc->dev->multi_count);
nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
while (nsect--)
ata_pio_sector(qc);
} else
ata_pio_sector(qc);
}
/**
* atapi_send_cdb - Write CDB bytes to hardware
* @ap: Port to which ATAPI device is attached.
@ -3118,11 +3150,11 @@ static int ata_pio_first_block(struct ata_port *ap)
* send first data block.
*/
/* ata_pio_sector() might change the state to HSM_ST_LAST.
* so, the state is changed here before ata_pio_sector().
/* ata_pio_sectors() might change the state to HSM_ST_LAST.
* so, the state is changed here before ata_pio_sectors().
*/
ap->hsm_task_state = HSM_ST;
ata_pio_sector(qc);
ata_pio_sectors(qc);
ata_altstatus(ap); /* flush */
} else
/* send CDB */
@ -3327,7 +3359,7 @@ static void ata_pio_block(struct ata_port *ap)
return;
}
ata_pio_sector(qc);
ata_pio_sectors(qc);
}
ata_altstatus(ap); /* flush */
@ -4213,7 +4245,7 @@ fsm_start:
goto fsm_start;
}
ata_pio_sector(qc);
ata_pio_sectors(qc);
if (ap->hsm_task_state == HSM_ST_LAST &&
(!(qc->tf.flags & ATA_TFLAG_WRITE))) {

8
include/linux/ata.h
View File

@ -293,6 +293,14 @@ static inline int is_atapi_taskfile(const struct ata_taskfile *tf)
(tf->protocol == ATA_PROT_ATAPI_DMA);
}
static inline int is_multi_taskfile(struct ata_taskfile *tf)
{
return (tf->command == ATA_CMD_READ_MULTI) ||
(tf->command == ATA_CMD_WRITE_MULTI) ||
(tf->command == ATA_CMD_READ_MULTI_EXT) ||
(tf->command == ATA_CMD_WRITE_MULTI_EXT);
}
static inline int ata_ok(u8 status)
{
return ((status & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ | ATA_ERR))