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sata_promise: ATAPI cleanup

Here's a cleanup for yesterday's sata_promise ATAPI patch:
- add and use a symbolic constant for the altstatus register
- check return status from ata_busy_wait()
- add missing newline in a warning printk()
- update comment in pdc_issue_atapi_pkt_cmd() to clarify
  that the maybe-wait-for-INT issue cannot occur in the
  current driver, but may occur if the driver starts issuing
  ATAPI non-DMA commands as PDC packets

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Mikael Pettersson 2007-01-10 09:32:34 +01:00 committed by Jeff Garzik
parent 1fd7a697a3
commit 73fd456b2d
1 changed files with 16 additions and 11 deletions

View File

@ -59,6 +59,7 @@ enum {
PDC_CYLINDER_HIGH = 0x14, /* Cylinder high reg (per port) */
PDC_DEVICE = 0x18, /* Device/Head reg (per port) */
PDC_COMMAND = 0x1C, /* Command/status reg (per port) */
PDC_ALTSTATUS = 0x38, /* Alternate-status/device-control reg (per port) */
PDC_PKT_SUBMIT = 0x40, /* Command packet pointer addr */
PDC_INT_SEQMASK = 0x40, /* Mask of asserted SEQ INTs */
PDC_FLASH_CTL = 0x44, /* Flash control register */
@ -728,7 +729,7 @@ static unsigned int pdc_wait_for_drq(struct ata_port *ap)
* know when to time out the outer loop.
*/
for(i = 0; i < 1000; ++i) {
status = readb(port_mmio + 0x38); /* altstatus */
status = readb(port_mmio + PDC_ALTSTATUS);
if (status == 0xFF)
break;
if (status & ATA_BUSY)
@ -738,7 +739,15 @@ static unsigned int pdc_wait_for_drq(struct ata_port *ap)
mdelay(1);
}
if (i >= 1000)
ata_port_printk(ap, KERN_WARNING, "%s timed out", __FUNCTION__);
ata_port_printk(ap, KERN_WARNING, "%s timed out\n", __FUNCTION__);
return status;
}
static unsigned int pdc_wait_on_busy(struct ata_port *ap)
{
unsigned int status = ata_busy_wait(ap, ATA_BUSY, 1000);
if (status != 0xff && (status & ATA_BUSY))
ata_port_printk(ap, KERN_WARNING, "%s timed out\n", __FUNCTION__);
return status;
}
@ -762,7 +771,7 @@ static void pdc_issue_atapi_pkt_cmd(struct ata_queued_cmd *qc)
tmp |= ATA_DEV1;
}
writeb(tmp, port_mmio + PDC_DEVICE);
ata_busy_wait(ap, ATA_BUSY, 1000);
pdc_wait_on_busy(ap);
writeb(0x00, port_mmio + PDC_SECTOR_COUNT);
writeb(0x00, port_mmio + PDC_SECTOR_NUMBER);
@ -788,14 +797,10 @@ static void pdc_issue_atapi_pkt_cmd(struct ata_queued_cmd *qc)
/* send ATAPI packet command 0xA0 */
writeb(ATA_CMD_PACKET, port_mmio + PDC_COMMAND);
/*
* At this point in the issuing of a packet command, the Promise
* driver busy-waits for INT (CTLSTAT bit 27) if it detected
* (at port init time) that the device interrupts with assertion
* of DRQ after receiving a packet command.
*
* XXX: Do we need to handle this case as well? Does libata detect
* this case for us, or do we have to do our own per-port init?
/* pdc_qc_issue_prot() currently sends ATAPI PIO packets back
* to libata. If we start handling those packets ourselves,
* then we must busy-wait for INT (CTLSTAT bit 27) at this point
* if the device has ATA_DFLAG_CDB_INTR set.
*/
pdc_wait_for_drq(ap);