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