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sata_promise: handle ATAPI_NODATA ourselves 

This patch extends sata_promise to handle ATAPI_NODATA
commands internally. However, commands destined to
ATA_DFLAG_CDB_INTR devices are excluded from this and
continue to be returned to libata.

Concrete changes:
- pdc_atapi_dma_pkt() is renamed to pdc_atapi_pkt(), and is
  extended to set up correct headers for NODATA packets
- pdc_qc_prep() calls pdc_atapi_pkt() for ATAPI_NODATA
- pdc_host_intr() handles ATAPI_NODATA
- pdc_qc_issue_prot() sends ATAPI_NODATA packets via the
  chip's packet mechanism, except for CDB_INTR devices

Tested on first- and second-generation chips, SATAPI and PATAPI,
with no observable regressions.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Mikael Pettersson 2007-01-13 21:32:30 +01:00 committed by Jeff Garzik
parent 4113bb6b67
commit fba6edbd3b
1 changed files with 23 additions and 7 deletions
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30
drivers/ata/sata_promise.c
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@ -448,7 +448,7 @@ static void pdc_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
writel(val, (void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
}
static void pdc_atapi_dma_pkt(struct ata_queued_cmd *qc)
static void pdc_atapi_pkt(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
dma_addr_t sg_table = ap->prd_dma;
@ -462,10 +462,20 @@ static void pdc_atapi_dma_pkt(struct ata_queued_cmd *qc)
/* set control bits (byte 0), zero delay seq id (byte 3),
* and seq id (byte 2)
*/
if (!(qc->tf.flags & ATA_TFLAG_WRITE))
buf32[0] = cpu_to_le32(PDC_PKT_READ);
else
buf32[0] = 0;
switch (qc->tf.protocol) {
case ATA_PROT_ATAPI_DMA:
if (!(qc->tf.flags & ATA_TFLAG_WRITE))
buf32[0] = cpu_to_le32(PDC_PKT_READ);
else
buf32[0] = 0;
break;
case ATA_PROT_ATAPI_NODATA:
buf32[0] = cpu_to_le32(PDC_PKT_NODATA);
break;
default:
BUG();
break;
}
buf32[1] = cpu_to_le32(sg_table); /* S/G table addr */
buf32[2] = 0; /* no next-packet */
@ -549,13 +559,14 @@ static void pdc_qc_prep(struct ata_queued_cmd *qc)
break;
case ATA_PROT_ATAPI:
case ATA_PROT_ATAPI_NODATA:
ata_qc_prep(qc);
break;
case ATA_PROT_ATAPI_DMA:
ata_qc_prep(qc);
pdc_atapi_dma_pkt(qc);
/*FALLTHROUGH*/
case ATA_PROT_ATAPI_NODATA:
pdc_atapi_pkt(qc);
break;
default:
@ -672,6 +683,7 @@ static inline unsigned int pdc_host_intr( struct ata_port *ap,
case ATA_PROT_DMA:
case ATA_PROT_NODATA:
case ATA_PROT_ATAPI_DMA:
case ATA_PROT_ATAPI_NODATA:
qc->err_mask |= ac_err_mask(ata_wait_idle(ap));
ata_qc_complete(qc);
handled = 1;
@ -771,6 +783,10 @@ static inline void pdc_packet_start(struct ata_queued_cmd *qc)
static unsigned int pdc_qc_issue_prot(struct ata_queued_cmd *qc)
{
switch (qc->tf.protocol) {
case ATA_PROT_ATAPI_NODATA:
if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
break;
/*FALLTHROUGH*/
case ATA_PROT_ATAPI_DMA:
case ATA_PROT_DMA:
case ATA_PROT_NODATA: