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sata_mv: restructure mv_qc_issue 

Rearrange logic in mv_qc_issue() to handle protocols
other than ATA_PROT_DMA, ATA_PROT_NCQ, and ATA_PROT_PIO.
This is in preparation for later enabling ATAPI support.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Mark Lord 2009-01-30 18:48:41 -05:00 committed by Jeff Garzik
parent 00b81235aa
commit f48765ccb4
1 changed files with 22 additions and 15 deletions
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37
drivers/ata/sata_mv.c
View File

@ -1565,14 +1565,26 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
*/
static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
{
static int limit_warnings = 10;
struct ata_port *ap = qc->ap;
void __iomem *port_mmio = mv_ap_base(ap);
struct mv_port_priv *pp = ap->private_data;
u32 in_index;
unsigned int port_irqs = DONE_IRQ | ERR_IRQ;
if ((qc->tf.protocol != ATA_PROT_DMA) &&
(qc->tf.protocol != ATA_PROT_NCQ)) {
static int limit_warnings = 10;
switch (qc->tf.protocol) {
case ATA_PROT_DMA:
case ATA_PROT_NCQ:
mv_start_edma(ap, port_mmio, pp, qc->tf.protocol);
pp->req_idx = (pp->req_idx + 1) & MV_MAX_Q_DEPTH_MASK;
in_index = pp->req_idx << EDMA_REQ_Q_PTR_SHIFT;
/* Write the request in pointer to kick the EDMA to life */
writelfl((pp->crqb_dma & EDMA_REQ_Q_BASE_LO_MASK) | in_index,
port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
return 0;
case ATA_PROT_PIO:
/*
* Errata SATA#16, SATA#24: warn if multiple DRQs expected.
*
@ -1590,27 +1602,22 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
": attempting PIO w/multiple DRQ: "
"this may fail due to h/w errata\n");
}
/* drop through */
case ATAPI_PROT_PIO:
port_irqs = ERR_IRQ; /* leave DONE_IRQ masked for PIO */
/* drop through */
default:
/*
* We're about to send a non-EDMA capable command to the
* port. Turn off EDMA so there won't be problems accessing
* shadow block, etc registers.
*/
mv_stop_edma(ap);
mv_enable_port_irqs(ap, ERR_IRQ);
mv_edma_cfg(ap, 0, 0);
mv_clear_and_enable_port_irqs(ap, mv_ap_base(ap), port_irqs);
mv_pmp_select(ap, qc->dev->link->pmp);
return ata_sff_qc_issue(qc);
}
mv_start_edma(ap, port_mmio, pp, qc->tf.protocol);
pp->req_idx = (pp->req_idx + 1) & MV_MAX_Q_DEPTH_MASK;
in_index = pp->req_idx << EDMA_REQ_Q_PTR_SHIFT;
/* and write the request in pointer to kick the EDMA to life */
writelfl((pp->crqb_dma & EDMA_REQ_Q_BASE_LO_MASK) | in_index,
port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
return 0;
}
static struct ata_queued_cmd *mv_get_active_qc(struct ata_port *ap)