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