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Subject[PATCH 2.6.20-rc4] 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>

--- linux-2.6.20-rc4/drivers/ata/sata_promise.c.~1~ 2007-01-09 18:53:25.000000000 +0100
+++ linux-2.6.20-rc4/drivers/ata/sata_promise.c 2007-01-09 21:54:50.000000000 +0100
@@ -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(str
* 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(str
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(stru
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(stru
/* 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);
-
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