[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>

1 files changed, 36 insertions, 1 deletions

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index b74af945a2fe..542e244f37ab 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -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 */
@@ -1791,6 +1795,33 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *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 {