libata: remove check_status from non-SFF drivers

Now that all SFF stuff is separated out of core layer, core layer
doesn't call ops->[alt_]check_status().  In fact, no one calls them
for non-SFF drivers anymore.  Kill them.

Signed-off-by: Tejun Heo <htejun@gmail.com>

3 files changed, 8 insertions, 83 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index ad5b6f384ba1..9642a7103cb6 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -247,7 +247,6 @@ static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
 static int ahci_port_start(struct ata_port *ap);
 static void ahci_port_stop(struct ata_port *ap);
 static void ahci_qc_prep(struct ata_queued_cmd *qc);
-static u8 ahci_check_status(struct ata_port *ap);
 static void ahci_freeze(struct ata_port *ap);
 static void ahci_thaw(struct ata_port *ap);
 static void ahci_pmp_attach(struct ata_port *ap);
@@ -292,9 +291,6 @@ static struct scsi_host_template ahci_sht = {
 static struct ata_port_operations ahci_ops = {
         .inherits               = &sata_pmp_port_ops,
 
-        .sff_check_status       = ahci_check_status,
-        .sff_check_altstatus    = ahci_check_status,
-
         .qc_defer               = sata_pmp_qc_defer_cmd_switch,
         .qc_prep                = ahci_qc_prep,
         .qc_issue               = ahci_qc_issue,
@@ -1185,11 +1181,12 @@ static int ahci_kick_engine(struct ata_port *ap, int force_restart)
 {
         void __iomem *port_mmio = ap->ioaddr.cmd_addr;
         struct ahci_host_priv *hpriv = ap->host->private_data;
+        u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
         u32 tmp;
         int busy, rc;
 
         /* do we need to kick the port? */
-        busy = ahci_check_status(ap) & (ATA_BUSY | ATA_DRQ);
+        busy = status & (ATA_BUSY | ATA_DRQ);
         if (!busy && !force_restart)
                 return 0;
 
@@ -1466,13 +1463,6 @@ static int ahci_pmp_softreset(struct ata_link *link, unsigned int *class,
         return ahci_do_softreset(link, class, link->pmp, deadline);
 }
 
-static u8 ahci_check_status(struct ata_port *ap)
-{
-        void __iomem *mmio = ap->ioaddr.cmd_addr;
-
-        return readl(mmio + PORT_TFDATA) & 0xFF;
-}
-
 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
 {
         struct scatterlist *sg;
diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index e880b7ec060f..0cb0a57ddb36 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -244,17 +244,6 @@ struct sata_fsl_port_priv {
         dma_addr_t cmdslot_paddr;
         struct command_desc *cmdentry;
         dma_addr_t cmdentry_paddr;
-
-        /*
-         * SATA FSL controller has a Status FIS which should contain the
-         * received D2H FIS & taskfile registers. This SFIS is present in
-         * the command descriptor, and to have a ready reference to it,
-         * we are caching it here, quite similar to what is done in H/W on
-         * AHCI compliant devices by copying taskfile fields to a 32-bit
-         * register.
-         */
-
-        struct ata_taskfile tf;
 };
 
 /*
@@ -569,31 +558,6 @@ static void sata_fsl_thaw(struct ata_port *ap)
                 ioread32(hcr_base + HCONTROL), ioread32(hcr_base + HSTATUS));
 }
 
-/*
- * NOTE : 1st D2H FIS from device does not update sfis in command descriptor.
- */
-static inline void sata_fsl_cache_taskfile_from_d2h_fis(struct ata_queued_cmd
-                                                        *qc,
-                                                        struct ata_port *ap)
-{
-        struct sata_fsl_port_priv *pp = ap->private_data;
-        struct sata_fsl_host_priv *host_priv = ap->host->private_data;
-        void __iomem *hcr_base = host_priv->hcr_base;
-        unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
-        struct command_desc *cd;
-
-        cd = pp->cmdentry + tag;
-
-        ata_tf_from_fis(cd->sfis, &pp->tf);
-}
-
-static u8 sata_fsl_check_status(struct ata_port *ap)
-{
-        struct sata_fsl_port_priv *pp = ap->private_data;
-
-        return pp->tf.command;
-}
-
 static int sata_fsl_port_start(struct ata_port *ap)
 {
         struct device *dev = ap->host->dev;
@@ -1004,10 +968,9 @@ static void sata_fsl_error_intr(struct ata_port *ap)
         /* record error info */
         qc = ata_qc_from_tag(ap, link->active_tag);
 
-        if (qc) {
-                sata_fsl_cache_taskfile_from_d2h_fis(qc, qc->ap);
+        if (qc)
                 qc->err_mask |= err_mask;
-        } else
+        else
                 ehi->err_mask |= err_mask;
 
         ehi->action |= action;
@@ -1020,14 +983,6 @@ static void sata_fsl_error_intr(struct ata_port *ap)
                 ata_port_abort(ap);
 }
 
-static void sata_fsl_qc_complete(struct ata_queued_cmd *qc)
-{
-        if (qc->flags & ATA_QCFLAG_RESULT_TF) {
-                DPRINTK("xx_qc_complete called\n");
-                sata_fsl_cache_taskfile_from_d2h_fis(qc, qc->ap);
-        }
-}
-
 static void sata_fsl_host_intr(struct ata_port *ap)
 {
         struct ata_link *link = &ap->link;
@@ -1068,10 +1023,8 @@ static void sata_fsl_host_intr(struct ata_port *ap)
                 for (i = 0; i < SATA_FSL_QUEUE_DEPTH; i++) {
                         if (qc_active & (1 << i)) {
                                 qc = ata_qc_from_tag(ap, i);
-                                if (qc) {
-                                        sata_fsl_qc_complete(qc);
+                                if (qc)
                                         ata_qc_complete(qc);
-                                }
                                 DPRINTK
                                     ("completing ncq cmd,tag=%d,CC=0x%x,CA=0x%x\n",
                                      i, ioread32(hcr_base + CC),
@@ -1087,10 +1040,8 @@ static void sata_fsl_host_intr(struct ata_port *ap)
                 DPRINTK("completing non-ncq cmd, tag=%d,CC=0x%x\n",
                         link->active_tag, ioread32(hcr_base + CC));
 
-                if (qc) {
-                        sata_fsl_qc_complete(qc);
+                if (qc)
                         ata_qc_complete(qc);
-                }
         } else {
                 /* Spurious Interrupt!! */
                 DPRINTK("spurious interrupt!!, CC = 0x%x\n",
@@ -1197,9 +1148,6 @@ static struct scsi_host_template sata_fsl_sht = {
 static const struct ata_port_operations sata_fsl_ops = {
         .inherits = &sata_port_ops,
 
-        .sff_check_status = sata_fsl_check_status,
-        .sff_check_altstatus = sata_fsl_check_status,
-
         .qc_prep = sata_fsl_qc_prep,
         .qc_issue = sata_fsl_qc_issue,
         .qc_fill_rtf = sata_fsl_qc_fill_rtf,
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 51a7c06803df..15a4067149b7 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -336,12 +336,10 @@ static struct sil24_cerr_info {
 struct sil24_port_priv {
         union sil24_cmd_block *cmd_block;       /* 32 cmd blocks */
         dma_addr_t cmd_block_dma;               /* DMA base addr for them */
-        struct ata_taskfile tf;                 /* Cached taskfile registers */
         int do_port_rst;
 };
 
 static void sil24_dev_config(struct ata_device *dev);
-static u8 sil24_check_status(struct ata_port *ap);
 static int sil24_scr_read(struct ata_port *ap, unsigned sc_reg, u32 *val);
 static int sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val);
 static int sil24_qc_defer(struct ata_queued_cmd *qc);
@@ -401,8 +399,6 @@ static struct scsi_host_template sil24_sht = {
 static struct ata_port_operations sil24_ops = {
         .inherits               = &sata_pmp_port_ops,
 
-        .sff_check_status       = sil24_check_status,
-        .sff_check_altstatus    = sil24_check_status,
         .qc_defer               = sil24_qc_defer,
         .qc_prep                = sil24_qc_prep,
         .qc_issue               = sil24_qc_issue,
@@ -492,12 +488,6 @@ static void sil24_read_tf(struct ata_port *ap, int tag, struct ata_taskfile *tf)
         ata_tf_from_fis(fis, tf);
 }
 
-static u8 sil24_check_status(struct ata_port *ap)
-{
-        struct sil24_port_priv *pp = ap->private_data;
-        return pp->tf.command;
-}
-
 static int sil24_scr_map[] = {
         [SCR_CONTROL]   = 0,
         [SCR_STATUS]    = 1,
@@ -1074,10 +1064,9 @@ static void sil24_error_intr(struct ata_port *ap)
                 }
 
                 /* record error info */
-                if (qc) {
-                        sil24_read_tf(ap, qc->tag, &pp->tf);
+                if (qc)
                         qc->err_mask |= err_mask;
-                } else
+                else
                         ehi->err_mask |= err_mask;
 
                 ehi->action |= action;
@@ -1210,8 +1199,6 @@ static int sil24_port_start(struct ata_port *ap)
         if (!pp)
                 return -ENOMEM;
 
-        pp->tf.command = ATA_DRDY;
-
         cb = dmam_alloc_coherent(dev, cb_size, &cb_dma, GFP_KERNEL);
         if (!cb)
                 return -ENOMEM;