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[libata] sata_mv: Add a new mv_sff_check_status() function to sata_mv. 

This is necessary for use with the upcoming "mv_qc_issue_fis()" patch,
but is being added separately here for easier code review.

When using command issue via the "mv_qc_issue_fis()" mechanism,
the initial ATA_BUSY bit does not show in the ATA status (shadow) register.
This can confuse libata!  So here we add a hook to fake ATA_BUSY
for that situation, until the first time a BUSY, DRQ, or ERR bit is seen.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Mark Lord 2009-02-25 15:17:43 -05:00 committed by Jeff Garzik
parent 42ed893d80
commit d16ab3f633
1 changed files with 36 additions and 1 deletions
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37
drivers/ata/sata_mv.c
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@ -370,6 +370,7 @@ enum {
MV_PP_FLAG_NCQ_EN = (1 << 1), /* is EDMA set up for NCQ? */
MV_PP_FLAG_FBS_EN = (1 << 2), /* is EDMA set up for FBS? */
MV_PP_FLAG_DELAYED_EH = (1 << 3), /* delayed dev err handling */
MV_PP_FLAG_FAKE_ATA_BUSY = (1 << 4), /* ignore initial ATA_DRDY */
};
#define IS_GEN_I(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_I)
@ -570,6 +571,7 @@ static void mv_bmdma_setup(struct ata_queued_cmd *qc);
static void mv_bmdma_start(struct ata_queued_cmd *qc);
static void mv_bmdma_stop(struct ata_queued_cmd *qc);
static u8 mv_bmdma_status(struct ata_port *ap);
static u8 mv_sff_check_status(struct ata_port *ap);
/* .sg_tablesize is (MV_MAX_SG_CT / 2) in the structures below
* because we have to allow room for worst case splitting of
@ -619,6 +621,7 @@ static struct ata_port_operations mv6_ops = {
.softreset = mv_softreset,
.error_handler = mv_pmp_error_handler,
.sff_check_status = mv_sff_check_status,
.sff_irq_clear = mv_sff_irq_clear,
.check_atapi_dma = mv_check_atapi_dma,
.bmdma_setup = mv_bmdma_setup,
@ -1284,7 +1287,8 @@ static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma)
/* set up non-NCQ EDMA configuration */
cfg = EDMA_CFG_Q_DEPTH; /* always 0x1f for *all* chips */
pp->pp_flags &= ~(MV_PP_FLAG_FBS_EN | MV_PP_FLAG_NCQ_EN);
pp->pp_flags &=
~(MV_PP_FLAG_FBS_EN | MV_PP_FLAG_NCQ_EN | MV_PP_FLAG_FAKE_ATA_BUSY);
if (IS_GEN_I(hpriv))
cfg |= (1 << 8); /* enab config burst size mask */
@ -1790,6 +1794,33 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
mv_fill_sg(qc);
}
/**
* mv_sff_check_status - fetch device status, if valid
* @ap: ATA port to fetch status from
*
* When using command issue via mv_qc_issue_fis(),
* the initial ATA_BUSY state does not show up in the
* ATA status (shadow) register. This can confuse libata!
*
* So we have a hook here to fake ATA_BUSY for that situation,
* until the first time a BUSY, DRQ, or ERR bit is seen.
*
* The rest of the time, it simply returns the ATA status register.
*/
static u8 mv_sff_check_status(struct ata_port *ap)
{
u8 stat = ioread8(ap->ioaddr.status_addr);
struct mv_port_priv *pp = ap->private_data;
if (pp->pp_flags & MV_PP_FLAG_FAKE_ATA_BUSY) {
if (stat & (ATA_BUSY | ATA_DRQ | ATA_ERR))
pp->pp_flags &= ~MV_PP_FLAG_FAKE_ATA_BUSY;
else
stat = ATA_BUSY;
}
return stat;
}
/**
* mv_qc_issue - Initiate a command to the host
* @qc: queued command to start
@ -1811,6 +1842,8 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
u32 in_index;
unsigned int port_irqs;
pp->pp_flags &= ~MV_PP_FLAG_FAKE_ATA_BUSY; /* paranoia */
switch (qc->tf.protocol) {
case ATA_PROT_DMA:
case ATA_PROT_NCQ:
@ -3038,6 +3071,8 @@ static int mv_hardreset(struct ata_link *link, unsigned int *class,
mv_reset_channel(hpriv, mmio, ap->port_no);
pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
pp->pp_flags &=
~(MV_PP_FLAG_FBS_EN | MV_PP_FLAG_NCQ_EN | MV_PP_FLAG_FAKE_ATA_BUSY);
/* Workaround for errata FEr SATA#10 (part 2) */
do {