libata: make SCR access ops per-link

Logically, SCR access ops should take @link; however, there was no
compelling reason to convert all SCR access ops when adding @link
abstraction as there's one-to-one mapping between a port and a non-PMP
link.  However, that assumption won't hold anymore with the scheduled
addition of slave link.

Make SCR access ops per-link.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

18 files changed, 153 insertions, 141 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 2e1a7cb..6acea41 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -267,8 +267,8 @@ struct ahci_port_priv {
 					 	 * per PM slot */
 };
 
-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_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int ahci_scr_write(struct ata_link *link, 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);
@@ -820,10 +820,10 @@ static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
 	return 0;
 }
 
-static int ahci_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 {
-	void __iomem *port_mmio = ahci_port_base(ap);
-	int offset = ahci_scr_offset(ap, sc_reg);
+	void __iomem *port_mmio = ahci_port_base(link->ap);
+	int offset = ahci_scr_offset(link->ap, sc_reg);
 
 	if (offset) {
 		*val = readl(port_mmio + offset);
@@ -832,10 +832,10 @@ static int ahci_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
 	return -EINVAL;
 }
 
-static int ahci_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 {
-	void __iomem *port_mmio = ahci_port_base(ap);
-	int offset = ahci_scr_offset(ap, sc_reg);
+	void __iomem *port_mmio = ahci_port_base(link->ap);
+	int offset = ahci_scr_offset(link->ap, sc_reg);
 
 	if (offset) {
 		writel(val, port_mmio + offset);
@@ -973,7 +973,7 @@ static void ahci_disable_alpm(struct ata_port *ap)
 	writel(PORT_IRQ_PHYRDY, port_mmio + PORT_IRQ_STAT);
 
 	/* go ahead and clean out PhyRdy Change from Serror too */
-	ahci_scr_write(ap, SCR_ERROR, ((1 << 16) | (1 << 18)));
+	ahci_scr_write(&ap->link, SCR_ERROR, ((1 << 16) | (1 << 18)));
 
 	/*
  	 * Clear flag to indicate that we should ignore all PhyRdy
@@ -1937,8 +1937,8 @@ static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
 	ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
 
 	/* AHCI needs SError cleared; otherwise, it might lock up */
-	ahci_scr_read(ap, SCR_ERROR, &serror);
-	ahci_scr_write(ap, SCR_ERROR, serror);
+	ahci_scr_read(&ap->link, SCR_ERROR, &serror);
+	ahci_scr_write(&ap->link, SCR_ERROR, serror);
 	host_ehi->serror |= serror;
 
 	/* some controllers set IRQ_IF_ERR on device errors, ignore it */
@@ -2027,7 +2027,7 @@ static void ahci_port_intr(struct ata_port *ap)
 	if ((hpriv->flags & AHCI_HFLAG_NO_HOTPLUG) &&
 		(status & PORT_IRQ_PHYRDY)) {
 		status &= ~PORT_IRQ_PHYRDY;
-		ahci_scr_write(ap, SCR_ERROR, ((1 << 16) | (1 << 18)));
+		ahci_scr_write(&ap->link, SCR_ERROR, ((1 << 16) | (1 << 18)));
 	}
 
 	if (unlikely(status & PORT_IRQ_ERROR)) {
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index e6b4606..81387ff 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -165,8 +165,10 @@ static void piix_set_dmamode(struct ata_port *ap, struct ata_device *adev);
 static void ich_set_dmamode(struct ata_port *ap, struct ata_device *adev);
 static int ich_pata_cable_detect(struct ata_port *ap);
 static u8 piix_vmw_bmdma_status(struct ata_port *ap);
-static int piix_sidpr_scr_read(struct ata_port *ap, unsigned int reg, u32 *val);
-static int piix_sidpr_scr_write(struct ata_port *ap, unsigned int reg, u32 val);
+static int piix_sidpr_scr_read(struct ata_link *link,
+			       unsigned int reg, u32 *val);
+static int piix_sidpr_scr_write(struct ata_link *link,
+				unsigned int reg, u32 val);
 #ifdef CONFIG_PM
 static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
 static int piix_pci_device_resume(struct pci_dev *pdev);
@@ -971,8 +973,10 @@ static u32 piix_merge_scr(u32 val0, u32 val1, const int * const *merge_tbl)
 	return val;
 }
 
-static int piix_sidpr_scr_read(struct ata_port *ap, unsigned int reg, u32 *val)
+static int piix_sidpr_scr_read(struct ata_link *link,
+			       unsigned int reg, u32 *val)
 {
+	struct ata_port *ap = link->ap;
 	const int * const sstatus_merge_tbl[] = {
 		/* DET */ (const int []){ 1, 3, 0, 4, 3, -1 },
 		/* SPD */ (const int []){ 2, 1, 0, -1 },
@@ -1013,8 +1017,11 @@ static int piix_sidpr_scr_read(struct ata_port *ap, unsigned int reg, u32 *val)
 	return 0;
 }
 
-static int piix_sidpr_scr_write(struct ata_port *ap, unsigned int reg, u32 val)
+static int piix_sidpr_scr_write(struct ata_link *link,
+				unsigned int reg, u32 val)
 {
+	struct ata_port *ap = link->ap;
+
 	if (reg >= ARRAY_SIZE(piix_sidx_map))
 		return -EINVAL;
 
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 79e3a8e..825461a 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4868,10 +4868,8 @@ int sata_scr_valid(struct ata_link *link)
 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
 {
 	if (ata_is_host_link(link)) {
-		struct ata_port *ap = link->ap;
-
 		if (sata_scr_valid(link))
-			return ap->ops->scr_read(ap, reg, val);
+			return link->ap->ops->scr_read(link, reg, val);
 		return -EOPNOTSUPP;
 	}
 
@@ -4897,10 +4895,8 @@ int sata_scr_read(struct ata_link *link, int reg, u32 *val)
 int sata_scr_write(struct ata_link *link, int reg, u32 val)
 {
 	if (ata_is_host_link(link)) {
-		struct ata_port *ap = link->ap;
-
 		if (sata_scr_valid(link))
-			return ap->ops->scr_write(ap, reg, val);
+			return link->ap->ops->scr_write(link, reg, val);
 		return -EOPNOTSUPP;
 	}
 
@@ -4925,13 +4921,12 @@ int sata_scr_write(struct ata_link *link, int reg, u32 val)
 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
 {
 	if (ata_is_host_link(link)) {
-		struct ata_port *ap = link->ap;
 		int rc;
 
 		if (sata_scr_valid(link)) {
-			rc = ap->ops->scr_write(ap, reg, val);
+			rc = link->ap->ops->scr_write(link, reg, val);
 			if (rc == 0)
-				rc = ap->ops->scr_read(ap, reg, &val);
+				rc = link->ap->ops->scr_read(link, reg, &val);
 			return rc;
 		}
 		return -EOPNOTSUPP;
diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index 3924e72..1a56db9 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -469,10 +469,10 @@ static bool sata_fsl_qc_fill_rtf(struct ata_queued_cmd *qc)
 	return true;
 }
 
-static int sata_fsl_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
-			       u32 val)
+static int sata_fsl_scr_write(struct ata_link *link,
+			      unsigned int sc_reg_in, u32 val)
 {
-	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
+	struct sata_fsl_host_priv *host_priv = link->ap->host->private_data;
 	void __iomem *ssr_base = host_priv->ssr_base;
 	unsigned int sc_reg;
 
@@ -493,10 +493,10 @@ static int sata_fsl_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
 	return 0;
 }
 
-static int sata_fsl_scr_read(struct ata_port *ap, unsigned int sc_reg_in,
-			u32 *val)
+static int sata_fsl_scr_read(struct ata_link *link,
+			     unsigned int sc_reg_in, u32 *val)
 {
-	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
+	struct sata_fsl_host_priv *host_priv = link->ap->host->private_data;
 	void __iomem *ssr_base = host_priv->ssr_base;
 	unsigned int sc_reg;
 
@@ -645,12 +645,12 @@ static int sata_fsl_port_start(struct ata_port *ap)
 	 * Workaround for 8315DS board 3gbps link-up issue,
 	 * currently limit SATA port to GEN1 speed
 	 */
-	sata_fsl_scr_read(ap, SCR_CONTROL, &temp);
+	sata_fsl_scr_read(&ap->link, SCR_CONTROL, &temp);
 	temp &= ~(0xF << 4);
 	temp |= (0x1 << 4);
-	sata_fsl_scr_write(ap, SCR_CONTROL, temp);
+	sata_fsl_scr_write(&ap->link, SCR_CONTROL, temp);
 
-	sata_fsl_scr_read(ap, SCR_CONTROL, &temp);
+	sata_fsl_scr_read(&ap->link, SCR_CONTROL, &temp);
 	dev_printk(KERN_WARNING, dev, "scr_control, speed limited to %x\n",
 			temp);
 #endif
@@ -868,7 +868,7 @@ issue_srst:
 			ioread32(CQ + hcr_base),
 			ioread32(CA + hcr_base), ioread32(CC + hcr_base));
 
-		sata_fsl_scr_read(ap, SCR_ERROR, &Serror);
+		sata_fsl_scr_read(&ap->link, SCR_ERROR, &Serror);
 
 		DPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
 		DPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
@@ -972,9 +972,9 @@ static void sata_fsl_error_intr(struct ata_port *ap)
 	 * Handle & Clear SError
 	 */
 
-	sata_fsl_scr_read(ap, SCR_ERROR, &SError);
+	sata_fsl_scr_read(&ap->link, SCR_ERROR, &SError);
 	if (unlikely(SError & 0xFFFF0000)) {
-		sata_fsl_scr_write(ap, SCR_ERROR, SError);
+		sata_fsl_scr_write(&ap->link, SCR_ERROR, SError);
 	}
 
 	DPRINTK("error_intr,hStat=0x%x,CE=0x%x,DE =0x%x,SErr=0x%x\n",
@@ -1091,7 +1091,7 @@ static void sata_fsl_host_intr(struct ata_port *ap)
 
 	hstatus = ioread32(hcr_base + HSTATUS);
 
-	sata_fsl_scr_read(ap, SCR_ERROR, &SError);
+	sata_fsl_scr_read(&ap->link, SCR_ERROR, &SError);
 
 	if (unlikely(SError & 0xFFFF0000)) {
 		DPRINTK("serror @host_intr : 0x%x\n", SError);
diff --git a/drivers/ata/sata_inic162x.c b/drivers/ata/sata_inic162x.c
index 5032c32..fbbd87c 100644
--- a/drivers/ata/sata_inic162x.c
+++ b/drivers/ata/sata_inic162x.c
@@ -269,9 +269,9 @@ static void inic_reset_port(void __iomem *port_base)
 	writeb(0xff, port_base + PORT_IRQ_STAT);
 }
 
-static int inic_scr_read(struct ata_port *ap, unsigned sc_reg, u32 *val)
+static int inic_scr_read(struct ata_link *link, unsigned sc_reg, u32 *val)
 {
-	void __iomem *scr_addr = inic_port_base(ap) + PORT_SCR;
+	void __iomem *scr_addr = inic_port_base(link->ap) + PORT_SCR;
 	void __iomem *addr;
 
 	if (unlikely(sc_reg >= ARRAY_SIZE(scr_map)))
@@ -286,9 +286,9 @@ static int inic_scr_read(struct ata_port *ap, unsigned sc_reg, u32 *val)
 	return 0;
 }
 
-static int inic_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val)
+static int inic_scr_write(struct ata_link *link, unsigned sc_reg, u32 val)
 {
-	void __iomem *scr_addr = inic_port_base(ap) + PORT_SCR;
+	void __iomem *scr_addr = inic_port_base(link->ap) + PORT_SCR;
 
 	if (unlikely(sc_reg >= ARRAY_SIZE(scr_map)))
 		return -EINVAL;
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index c815f8e..2b24ae5 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -493,10 +493,10 @@ struct mv_hw_ops {
 	void (*reset_bus)(struct ata_host *host, void __iomem *mmio);
 };
 
-static int mv_scr_read(struct ata_port *ap, unsigned int sc_reg_in, u32 *val);
-static int mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val);
-static int mv5_scr_read(struct ata_port *ap, unsigned int sc_reg_in, u32 *val);
-static int mv5_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val);
+static int mv_scr_read(struct ata_link *link, unsigned int sc_reg_in, u32 *val);
+static int mv_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val);
+static int mv5_scr_read(struct ata_link *link, unsigned int sc_reg_in, u32 *val);
+static int mv5_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val);
 static int mv_port_start(struct ata_port *ap);
 static void mv_port_stop(struct ata_port *ap);
 static int mv_qc_defer(struct ata_queued_cmd *qc);
@@ -1070,23 +1070,23 @@ static unsigned int mv_scr_offset(unsigned int sc_reg_in)
 	return ofs;
 }
 
-static int mv_scr_read(struct ata_port *ap, unsigned int sc_reg_in, u32 *val)
+static int mv_scr_read(struct ata_link *link, unsigned int sc_reg_in, u32 *val)
 {
 	unsigned int ofs = mv_scr_offset(sc_reg_in);
 
 	if (ofs != 0xffffffffU) {
-		*val = readl(mv_ap_base(ap) + ofs);
+		*val = readl(mv_ap_base(link->ap) + ofs);
 		return 0;
 	} else
 		return -EINVAL;
 }
 
-static int mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
+static int mv_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val)
 {
 	unsigned int ofs = mv_scr_offset(sc_reg_in);
 
 	if (ofs != 0xffffffffU) {
-		writelfl(val, mv_ap_base(ap) + ofs);
+		writelfl(val, mv_ap_base(link->ap) + ofs);
 		return 0;
 	} else
 		return -EINVAL;
@@ -2251,11 +2251,11 @@ static unsigned int mv5_scr_offset(unsigned int sc_reg_in)
 	return ofs;
 }
 
-static int mv5_scr_read(struct ata_port *ap, unsigned int sc_reg_in, u32 *val)
+static int mv5_scr_read(struct ata_link *link, unsigned int sc_reg_in, u32 *val)
 {
-	struct mv_host_priv *hpriv = ap->host->private_data;
+	struct mv_host_priv *hpriv = link->ap->host->private_data;
 	void __iomem *mmio = hpriv->base;
-	void __iomem *addr = mv5_phy_base(mmio, ap->port_no);
+	void __iomem *addr = mv5_phy_base(mmio, link->ap->port_no);
 	unsigned int ofs = mv5_scr_offset(sc_reg_in);
 
 	if (ofs != 0xffffffffU) {
@@ -2265,11 +2265,11 @@ static int mv5_scr_read(struct ata_port *ap, unsigned int sc_reg_in, u32 *val)
 		return -EINVAL;
 }
 
-static int mv5_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
+static int mv5_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val)
 {
-	struct mv_host_priv *hpriv = ap->host->private_data;
+	struct mv_host_priv *hpriv = link->ap->host->private_data;
 	void __iomem *mmio = hpriv->base;
-	void __iomem *addr = mv5_phy_base(mmio, ap->port_no);
+	void __iomem *addr = mv5_phy_base(mmio, link->ap->port_no);
 	unsigned int ofs = mv5_scr_offset(sc_reg_in);
 
 	if (ofs != 0xffffffffU) {
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 1e1f3f3..88fd4ae 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -302,8 +302,8 @@ static void nv_ck804_host_stop(struct ata_host *host);
 static irqreturn_t nv_generic_interrupt(int irq, void *dev_instance);
 static irqreturn_t nv_nf2_interrupt(int irq, void *dev_instance);
 static irqreturn_t nv_ck804_interrupt(int irq, void *dev_instance);
-static int nv_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-static int nv_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int nv_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int nv_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
 
 static void nv_nf2_freeze(struct ata_port *ap);
 static void nv_nf2_thaw(struct ata_port *ap);
@@ -1492,21 +1492,21 @@ static irqreturn_t nv_ck804_interrupt(int irq, void *dev_instance)
 	return ret;
 }
 
-static int nv_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int nv_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
 
-	*val = ioread32(ap->ioaddr.scr_addr + (sc_reg * 4));
+	*val = ioread32(link->ap->ioaddr.scr_addr + (sc_reg * 4));
 	return 0;
 }
 
-static int nv_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int nv_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
 
-	iowrite32(val, ap->ioaddr.scr_addr + (sc_reg * 4));
+	iowrite32(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
 	return 0;
 }
 
@@ -2184,9 +2184,9 @@ static void nv_swncq_host_interrupt(struct ata_port *ap, u16 fis)
 	if (!pp->qc_active)
 		return;
 
-	if (ap->ops->scr_read(ap, SCR_ERROR, &serror))
+	if (ap->ops->scr_read(&ap->link, SCR_ERROR, &serror))
 		return;
-	ap->ops->scr_write(ap, SCR_ERROR, serror);
+	ap->ops->scr_write(&ap->link, SCR_ERROR, serror);
 
 	if (ata_stat & ATA_ERR) {
 		ata_ehi_clear_desc(ehi);
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index 030665b..750d8cd 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -137,8 +137,8 @@ struct pdc_port_priv {
 	dma_addr_t		pkt_dma;
 };
 
-static int pdc_sata_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-static int pdc_sata_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int pdc_sata_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int pdc_sata_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
 static int pdc_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 static int pdc_common_port_start(struct ata_port *ap);
 static int pdc_sata_port_start(struct ata_port *ap);
@@ -386,19 +386,21 @@ static int pdc_sata_cable_detect(struct ata_port *ap)
 	return ATA_CBL_SATA;
 }
 
-static int pdc_sata_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int pdc_sata_scr_read(struct ata_link *link,
+			     unsigned int sc_reg, u32 *val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	*val = readl(ap->ioaddr.scr_addr + (sc_reg * 4));
+	*val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
 	return 0;
 }
 
-static int pdc_sata_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int pdc_sata_scr_write(struct ata_link *link,
+			      unsigned int sc_reg, u32 val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	writel(val, ap->ioaddr.scr_addr + (sc_reg * 4));
+	writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
 	return 0;
 }
 
@@ -731,7 +733,7 @@ static void pdc_error_intr(struct ata_port *ap, struct ata_queued_cmd *qc,
 	if (sata_scr_valid(&ap->link)) {
 		u32 serror;
 
-		pdc_sata_scr_read(ap, SCR_ERROR, &serror);
+		pdc_sata_scr_read(&ap->link, SCR_ERROR, &serror);
 		ehi->serror |= serror;
 	}
 
diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
index 1600107..a000c86 100644
--- a/drivers/ata/sata_qstor.c
+++ b/drivers/ata/sata_qstor.c
@@ -111,8 +111,8 @@ struct qs_port_priv {
 	qs_state_t		state;
 };
 
-static int qs_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-static int qs_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int qs_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int qs_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
 static int qs_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 static int qs_port_start(struct ata_port *ap);
 static void qs_host_stop(struct ata_host *host);
@@ -242,11 +242,11 @@ static int qs_prereset(struct ata_link *link, unsigned long deadline)
 	return ata_sff_prereset(link, deadline);
 }
 
-static int qs_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int qs_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	*val = readl(ap->ioaddr.scr_addr + (sc_reg * 8));
+	*val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 8));
 	return 0;
 }
 
@@ -256,11 +256,11 @@ static void qs_error_handler(struct ata_port *ap)
 	ata_std_error_handler(ap);
 }
 
-static int qs_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int qs_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	writel(val, ap->ioaddr.scr_addr + (sc_reg * 8));
+	writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 8));
 	return 0;
 }
 
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c
index 88bf421..031d7b7 100644
--- a/drivers/ata/sata_sil.c
+++ b/drivers/ata/sata_sil.c
@@ -115,8 +115,8 @@ static int sil_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 static int sil_pci_device_resume(struct pci_dev *pdev);
 #endif
 static void sil_dev_config(struct ata_device *dev);
-static int sil_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-static int sil_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int sil_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int sil_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
 static int sil_set_mode(struct ata_link *link, struct ata_device **r_failed);
 static void sil_freeze(struct ata_port *ap);
 static void sil_thaw(struct ata_port *ap);
@@ -317,9 +317,9 @@ static inline void __iomem *sil_scr_addr(struct ata_port *ap,
 	return NULL;
 }
 
-static int sil_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int sil_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 {
-	void __iomem *mmio = sil_scr_addr(ap, sc_reg);
+	void __iomem *mmio = sil_scr_addr(link->ap, sc_reg);
 
 	if (mmio) {
 		*val = readl(mmio);
@@ -328,9 +328,9 @@ static int sil_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
 	return -EINVAL;
 }
 
-static int sil_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int sil_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 {
-	void __iomem *mmio = sil_scr_addr(ap, sc_reg);
+	void __iomem *mmio = sil_scr_addr(link->ap, sc_reg);
 
 	if (mmio) {
 		writel(val, mmio);
@@ -352,8 +352,8 @@ static void sil_host_intr(struct ata_port *ap, u32 bmdma2)
 		 * controllers continue to assert IRQ as long as
 		 * SError bits are pending.  Clear SError immediately.
 		 */
-		sil_scr_read(ap, SCR_ERROR, &serror);
-		sil_scr_write(ap, SCR_ERROR, serror);
+		sil_scr_read(&ap->link, SCR_ERROR, &serror);
+		sil_scr_write(&ap->link, SCR_ERROR, serror);
 
 		/* Sometimes spurious interrupts occur, double check
 		 * it's PHYRDY CHG.
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 84ffcc2..4621807 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -340,8 +340,8 @@ struct sil24_port_priv {
 };
 
 static void sil24_dev_config(struct ata_device *dev);
-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_scr_read(struct ata_link *link, unsigned sc_reg, u32 *val);
+static int sil24_scr_write(struct ata_link *link, unsigned sc_reg, u32 val);
 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);
@@ -504,9 +504,9 @@ static int sil24_scr_map[] = {
 	[SCR_ACTIVE]	= 3,
 };
 
-static int sil24_scr_read(struct ata_port *ap, unsigned sc_reg, u32 *val)
+static int sil24_scr_read(struct ata_link *link, unsigned sc_reg, u32 *val)
 {
-	void __iomem *scr_addr = sil24_port_base(ap) + PORT_SCONTROL;
+	void __iomem *scr_addr = sil24_port_base(link->ap) + PORT_SCONTROL;
 
 	if (sc_reg < ARRAY_SIZE(sil24_scr_map)) {
 		void __iomem *addr;
@@ -517,9 +517,9 @@ static int sil24_scr_read(struct ata_port *ap, unsigned sc_reg, u32 *val)
 	return -EINVAL;
 }
 
-static int sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val)
+static int sil24_scr_write(struct ata_link *link, unsigned sc_reg, u32 val)
 {
-	void __iomem *scr_addr = sil24_port_base(ap) + PORT_SCONTROL;
+	void __iomem *scr_addr = sil24_port_base(link->ap) + PORT_SCONTROL;
 
 	if (sc_reg < ARRAY_SIZE(sil24_scr_map)) {
 		void __iomem *addr;
diff --git a/drivers/ata/sata_sis.c b/drivers/ata/sata_sis.c
index 1010b30..9c43b4e 100644
--- a/drivers/ata/sata_sis.c
+++ b/drivers/ata/sata_sis.c
@@ -64,8 +64,8 @@ enum {
 };
 
 static int sis_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
-static int sis_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-static int sis_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int sis_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int sis_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
 
 static const struct pci_device_id sis_pci_tbl[] = {
 	{ PCI_VDEVICE(SI, 0x0180), sis_180 },	/* SiS 964/180 */
@@ -134,10 +134,11 @@ static unsigned int get_scr_cfg_addr(struct ata_port *ap, unsigned int sc_reg)
 	return addr;
 }
 
-static u32 sis_scr_cfg_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static u32 sis_scr_cfg_read(struct ata_link *link,
+			    unsigned int sc_reg, u32 *val)
 {
-	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-	unsigned int cfg_addr = get_scr_cfg_addr(ap, sc_reg);
+	struct pci_dev *pdev = to_pci_dev(link->ap->host->dev);
+	unsigned int cfg_addr = get_scr_cfg_addr(link->ap, sc_reg);
 	u32 val2 = 0;
 	u8 pmr;
 
@@ -158,10 +159,11 @@ static u32 sis_scr_cfg_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
 	return 0;
 }
 
-static int sis_scr_cfg_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int sis_scr_cfg_write(struct ata_link *link,
+			     unsigned int sc_reg, u32 val)
 {
-	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-	unsigned int cfg_addr = get_scr_cfg_addr(ap, sc_reg);
+	struct pci_dev *pdev = to_pci_dev(link->ap->host->dev);
+	unsigned int cfg_addr = get_scr_cfg_addr(link->ap, sc_reg);
 	u8 pmr;
 
 	if (sc_reg == SCR_ERROR) /* doesn't exist in PCI cfg space */
@@ -178,8 +180,9 @@ static int sis_scr_cfg_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
 	return 0;
 }
 
-static int sis_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int sis_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 {
+	struct ata_port *ap = link->ap;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	u8 pmr;
 
@@ -187,7 +190,7 @@ static int sis_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
 		return -EINVAL;
 
 	if (ap->flags & SIS_FLAG_CFGSCR)
-		return sis_scr_cfg_read(ap, sc_reg, val);
+		return sis_scr_cfg_read(link, sc_reg, val);
 
 	pci_read_config_byte(pdev, SIS_PMR, &pmr);
 
@@ -202,8 +205,9 @@ static int sis_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
 	return 0;
 }
 
-static int sis_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int sis_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 {
+	struct ata_port *ap = link->ap;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	u8 pmr;
 
@@ -213,7 +217,7 @@ static int sis_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
 	pci_read_config_byte(pdev, SIS_PMR, &pmr);
 
 	if (ap->flags & SIS_FLAG_CFGSCR)
-		return sis_scr_cfg_write(ap, sc_reg, val);
+		return sis_scr_cfg_write(link, sc_reg, val);
 	else {
 		iowrite32(val, ap->ioaddr.scr_addr + (sc_reg * 4));
 		if ((pdev->device == 0x0182) || (pdev->device == 0x0183) ||
diff --git a/drivers/ata/sata_svw.c b/drivers/ata/sata_svw.c
index fb13b82..609d147 100644
--- a/drivers/ata/sata_svw.c
+++ b/drivers/ata/sata_svw.c
@@ -123,20 +123,22 @@ static int k2_sata_check_atapi_dma(struct ata_queued_cmd *qc)
 	}
 }
 
-static int k2_sata_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int k2_sata_scr_read(struct ata_link *link,
+			    unsigned int sc_reg, u32 *val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	*val = readl(ap->ioaddr.scr_addr + (sc_reg * 4));
+	*val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
 	return 0;
 }
 
 
-static int k2_sata_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int k2_sata_scr_write(struct ata_link *link,
+			     unsigned int sc_reg, u32 val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	writel(val, ap->ioaddr.scr_addr + (sc_reg * 4));
+	writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
 	return 0;
 }
 
diff --git a/drivers/ata/sata_uli.c b/drivers/ata/sata_uli.c
index db529b8..019575b 100644
--- a/drivers/ata/sata_uli.c
+++ b/drivers/ata/sata_uli.c
@@ -57,8 +57,8 @@ struct uli_priv {
 };
 
 static int uli_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
-static int uli_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-static int uli_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int uli_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int uli_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
 
 static const struct pci_device_id uli_pci_tbl[] = {
 	{ PCI_VDEVICE(AL, 0x5289), uli_5289 },
@@ -107,39 +107,39 @@ static unsigned int get_scr_cfg_addr(struct ata_port *ap, unsigned int sc_reg)
 	return hpriv->scr_cfg_addr[ap->port_no] + (4 * sc_reg);
 }
 
-static u32 uli_scr_cfg_read(struct ata_port *ap, unsigned int sc_reg)
+static u32 uli_scr_cfg_read(struct ata_link *link, unsigned int sc_reg)
 {
-	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-	unsigned int cfg_addr = get_scr_cfg_addr(ap, sc_reg);
+	struct pci_dev *pdev = to_pci_dev(link->ap->host->dev);
+	unsigned int cfg_addr = get_scr_cfg_addr(link->ap, sc_reg);
 	u32 val;
 
 	pci_read_config_dword(pdev, cfg_addr, &val);
 	return val;
 }
 
-static void uli_scr_cfg_write(struct ata_port *ap, unsigned int scr, u32 val)
+static void uli_scr_cfg_write(struct ata_link *link, unsigned int scr, u32 val)
 {
-	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-	unsigned int cfg_addr = get_scr_cfg_addr(ap, scr);
+	struct pci_dev *pdev = to_pci_dev(link->ap->host->dev);
+	unsigned int cfg_addr = get_scr_cfg_addr(link->ap, scr);
 
 	pci_write_config_dword(pdev, cfg_addr, val);
 }
 
-static int uli_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int uli_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
 
-	*val = uli_scr_cfg_read(ap, sc_reg);
+	*val = uli_scr_cfg_read(link, sc_reg);
 	return 0;
 }
 
-static int uli_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int uli_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 {
 	if (sc_reg > SCR_CONTROL) //SCR_CONTROL=2, SCR_ERROR=1, SCR_STATUS=0
 		return -EINVAL;
 
-	uli_scr_cfg_write(ap, sc_reg, val);
+	uli_scr_cfg_write(link, sc_reg, val);
 	return 0;
 }
 
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
index 96deeb3..1cfa745 100644
--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -68,8 +68,8 @@ enum {
 };
 
 static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
-static int svia_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-static int svia_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
 static void svia_noop_freeze(struct ata_port *ap);
 static int vt6420_prereset(struct ata_link *link, unsigned long deadline);
 static int vt6421_pata_cable_detect(struct ata_port *ap);
@@ -152,19 +152,19 @@ MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
 MODULE_VERSION(DRV_VERSION);
 
-static int svia_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	*val = ioread32(ap->ioaddr.scr_addr + (4 * sc_reg));
+	*val = ioread32(link->ap->ioaddr.scr_addr + (4 * sc_reg));
 	return 0;
 }
 
-static int svia_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	iowrite32(val, ap->ioaddr.scr_addr + (4 * sc_reg));
+	iowrite32(val, link->ap->ioaddr.scr_addr + (4 * sc_reg));
 	return 0;
 }
 
@@ -210,20 +210,20 @@ static int vt6420_prereset(struct ata_link *link, unsigned long deadline)
 		goto skip_scr;
 
 	/* Resume phy.  This is the old SATA resume sequence */
-	svia_scr_write(ap, SCR_CONTROL, 0x300);
-	svia_scr_read(ap, SCR_CONTROL, &scontrol); /* flush */
+	svia_scr_write(link, SCR_CONTROL, 0x300);
+	svia_scr_read(link, SCR_CONTROL, &scontrol); /* flush */
 
 	/* wait for phy to become ready, if necessary */
 	do {
 		msleep(200);
-		svia_scr_read(ap, SCR_STATUS, &sstatus);
+		svia_scr_read(link, SCR_STATUS, &sstatus);
 		if ((sstatus & 0xf) != 1)
 			break;
 	} while (time_before(jiffies, timeout));
 
 	/* open code sata_print_link_status() */
-	svia_scr_read(ap, SCR_STATUS, &sstatus);
-	svia_scr_read(ap, SCR_CONTROL, &scontrol);
+	svia_scr_read(link, SCR_STATUS, &sstatus);
+	svia_scr_read(link, SCR_CONTROL, &scontrol);
 
 	online = (sstatus & 0xf) == 0x3;
 
@@ -232,7 +232,7 @@ static int vt6420_prereset(struct ata_link *link, unsigned long deadline)
 			online ? "up" : "down", sstatus, scontrol);
 
 	/* SStatus is read one more time */
-	svia_scr_read(ap, SCR_STATUS, &sstatus);
+	svia_scr_read(link, SCR_STATUS, &sstatus);
 
 	if (!online) {
 		/* tell EH to bail */
diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
index f3d635c..c57cdff 100644
--- a/drivers/ata/sata_vsc.c
+++ b/drivers/ata/sata_vsc.c
@@ -98,20 +98,22 @@ enum {
 			      VSC_SATA_INT_PHY_CHANGE),
 };
 
-static int vsc_sata_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int vsc_sata_scr_read(struct ata_link *link,
+			     unsigned int sc_reg, u32 *val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	*val = readl(ap->ioaddr.scr_addr + (sc_reg * 4));
+	*val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
 	return 0;
 }
 
 
-static int vsc_sata_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int vsc_sata_scr_write(struct ata_link *link,
+			      unsigned int sc_reg, u32 val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
-	writel(val, ap->ioaddr.scr_addr + (sc_reg * 4));
+	writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
 	return 0;
 }
 
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 48ee8c7..e187298 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -294,10 +294,10 @@ static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 	}
 }
 
-static int sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
+static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in,
 			      u32 val)
 {
-	struct domain_device *dev = ap->private_data;
+	struct domain_device *dev = link->ap->private_data;
 
 	SAS_DPRINTK("STUB %s\n", __func__);
 	switch (sc_reg_in) {
@@ -319,10 +319,10 @@ static int sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
 	return 0;
 }
 
-static int sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in,
+static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
 			    u32 *val)
 {
-	struct domain_device *dev = ap->private_data;
+	struct domain_device *dev = link->ap->private_data;
 
 	SAS_DPRINTK("STUB %s\n", __func__);
 	switch (sc_reg_in) {
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 225bfc5..ffd622f 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -772,8 +772,8 @@ struct ata_port_operations {
 	/*
 	 * Optional features
 	 */
-	int  (*scr_read)(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-	int  (*scr_write)(struct ata_port *ap, unsigned int sc_reg, u32 val);
+	int  (*scr_read)(struct ata_link *link, unsigned int sc_reg, u32 *val);
+	int  (*scr_write)(struct ata_link *link, unsigned int sc_reg, u32 val);
 	void (*pmp_attach)(struct ata_port *ap);
 	void (*pmp_detach)(struct ata_port *ap);
 	int  (*enable_pm)(struct ata_port *ap, enum link_pm policy);