libata: replace tf_read with qc_fill_rtf for non-SFF drivers

Now that all SFF stuff is separated out of core layer, core layer
doesn't call ops->tf_read directly.  It gets called only via
ops->qc_fill_rtf() for non-SFF drivers.  This patch directly
implements private ops->qc_fill_rtf() for non-SFF controllers and kill
ops->tf_read().

This is much cleaner for non-SFF controllers as some of them have to
cache SFF register values in private data structure and report the
cached values via ops->tf_read().  Also, ops->tf_read() gets nasty for
controllers which don't have clear notion of TF registers when
operation is not in progress.

As this change makes default ops->qc_fill_rtf unnecessary, move
ata_sff_qc_fill_rtf() form ata_base_port_ops to ata_sff_port_ops where
it belongs.

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

5 files changed, 27 insertions, 28 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 1389c64..ad5b6f3 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -243,9 +243,9 @@ static int ahci_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
 static int ahci_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
 static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
+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_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
 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);
@@ -295,10 +295,10 @@ static struct ata_port_operations ahci_ops = {
 	.sff_check_status	= ahci_check_status,
 	.sff_check_altstatus	= ahci_check_status,
 
-	.sff_tf_read		= ahci_tf_read,
 	.qc_defer		= sata_pmp_qc_defer_cmd_switch,
 	.qc_prep		= ahci_qc_prep,
 	.qc_issue		= ahci_qc_issue,
+	.qc_fill_rtf		= ahci_qc_fill_rtf,
 
 	.freeze			= ahci_freeze,
 	.thaw			= ahci_thaw,
@@ -1473,14 +1473,6 @@ static u8 ahci_check_status(struct ata_port *ap)
 	return readl(mmio + PORT_TFDATA) & 0xFF;
 }
 
-static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
-{
-	struct ahci_port_priv *pp = ap->private_data;
-	u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
-
-	ata_tf_from_fis(d2h_fis, tf);
-}
-
 static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
 {
 	struct scatterlist *sg;
@@ -1779,6 +1771,15 @@ static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
 	return 0;
 }
 
+static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
+{
+	struct ahci_port_priv *pp = qc->ap->private_data;
+	u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
+
+	ata_tf_from_fis(d2h_fis, &qc->result_tf);
+	return true;
+}
+
 static void ahci_freeze(struct ata_port *ap)
 {
 	void __iomem *port_mmio = ahci_port_base(ap);
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index dcc5a28..e8598ee 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -74,7 +74,6 @@ const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
 const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
 
 const struct ata_port_operations ata_base_port_ops = {
-	.qc_fill_rtf		= ata_sff_qc_fill_rtf,
 	.prereset		= ata_std_prereset,
 	.postreset		= ata_std_postreset,
 	.error_handler		= ata_std_error_handler,
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 5ae813f..8e6c78a 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -44,6 +44,7 @@ const struct ata_port_operations ata_sff_port_ops = {
 
 	.qc_prep		= ata_sff_qc_prep,
 	.qc_issue		= ata_sff_qc_issue,
+	.qc_fill_rtf		= ata_sff_qc_fill_rtf,
 
 	.freeze			= ata_sff_freeze,
 	.thaw			= ata_sff_thaw,
diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index 37482d4..e880b7e 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -464,6 +464,20 @@ static unsigned int sata_fsl_qc_issue(struct ata_queued_cmd *qc)
 	return 0;
 }
 
+static bool sata_fsl_qc_fill_rtf(struct ata_queued_cmd *qc)
+{
+	struct sata_fsl_port_priv *pp = qc->ap->private_data;
+	struct sata_fsl_host_priv *host_priv = qc->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, &qc->result_tf);
+	return true;
+}
+
 static int sata_fsl_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
 			       u32 val)
 {
@@ -580,13 +594,6 @@ static u8 sata_fsl_check_status(struct ata_port *ap)
 	return pp->tf.command;
 }
 
-static void sata_fsl_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
-{
-	struct sata_fsl_port_priv *pp = ap->private_data;
-
-	*tf = pp->tf;
-}
-
 static int sata_fsl_port_start(struct ata_port *ap)
 {
 	struct device *dev = ap->host->dev;
@@ -1193,10 +1200,9 @@ static const struct ata_port_operations sata_fsl_ops = {
 	.sff_check_status = sata_fsl_check_status,
 	.sff_check_altstatus = sata_fsl_check_status,
 
-	.sff_tf_read = sata_fsl_tf_read,
-
 	.qc_prep = sata_fsl_qc_prep,
 	.qc_issue = sata_fsl_qc_issue,
+	.qc_fill_rtf = sata_fsl_qc_fill_rtf,
 
 	.scr_read = sata_fsl_scr_read,
 	.scr_write = sata_fsl_scr_write,
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 79952f8..51a7c06 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -344,7 +344,6 @@ 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 void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
 static int sil24_qc_defer(struct ata_queued_cmd *qc);
 static void sil24_qc_prep(struct ata_queued_cmd *qc);
 static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc);
@@ -404,7 +403,6 @@ static struct ata_port_operations sil24_ops = {
 
 	.sff_check_status	= sil24_check_status,
 	.sff_check_altstatus	= sil24_check_status,
-	.sff_tf_read		= sil24_tf_read,
 	.qc_defer		= sil24_qc_defer,
 	.qc_prep		= sil24_qc_prep,
 	.qc_issue		= sil24_qc_issue,
@@ -533,12 +531,6 @@ static int sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val)
 	return -EINVAL;
 }
 
-static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
-{
-	struct sil24_port_priv *pp = ap->private_data;
-	*tf = pp->tf;
-}
-
 static void sil24_config_port(struct ata_port *ap)
 {
 	void __iomem *port = ap->ioaddr.cmd_addr;