diff --git a/drivers/ata/sata_sis.c b/drivers/ata/sata_sis.c
index 8f9833228619..f8a91bfd66a8 100644
--- a/drivers/ata/sata_sis.c
+++ b/drivers/ata/sata_sis.c
@@ -109,8 +109,9 @@ MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, sis_pci_tbl);
 MODULE_VERSION(DRV_VERSION);
 
-static unsigned int get_scr_cfg_addr(struct ata_port *ap, unsigned int sc_reg)
+static unsigned int get_scr_cfg_addr(struct ata_link *link, unsigned int sc_reg)
 {
+	struct ata_port *ap = link->ap;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	unsigned int addr = SIS_SCR_BASE + (4 * sc_reg);
 	u8 pmr;
@@ -131,6 +132,9 @@ static unsigned int get_scr_cfg_addr(struct ata_port *ap, unsigned int sc_reg)
 			break;
 		}
 	}
+	if (link->pmp)
+		addr += 0x10;
+
 	return addr;
 }
 
@@ -138,24 +142,12 @@ static u32 sis_scr_cfg_read(struct ata_link *link,
 			    unsigned int sc_reg, u32 *val)
 {
 	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;
+	unsigned int cfg_addr = get_scr_cfg_addr(link, sc_reg);
 
 	if (sc_reg == SCR_ERROR) /* doesn't exist in PCI cfg space */
 		return -EINVAL;
 
-	pci_read_config_byte(pdev, SIS_PMR, &pmr);
-
 	pci_read_config_dword(pdev, cfg_addr, val);
-
-	if ((pdev->device == 0x0182) || (pdev->device == 0x0183) ||
-	    (pdev->device == 0x1182) || (pmr & SIS_PMR_COMBINED))
-		pci_read_config_dword(pdev, cfg_addr+0x10, &val2);
-
-	*val |= val2;
-	*val &= 0xfffffffb;	/* avoid problems with powerdowned ports */
-
 	return 0;
 }
 
@@ -163,28 +155,16 @@ static int sis_scr_cfg_write(struct ata_link *link,
 			     unsigned int sc_reg, u32 val)
 {
 	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 */
-		return -EINVAL;
-
-	pci_read_config_byte(pdev, SIS_PMR, &pmr);
+	unsigned int cfg_addr = get_scr_cfg_addr(link, sc_reg);
 
 	pci_write_config_dword(pdev, cfg_addr, val);
-
-	if ((pdev->device == 0x0182) || (pdev->device == 0x0183) ||
-	    (pdev->device == 0x1182) || (pmr & SIS_PMR_COMBINED))
-		pci_write_config_dword(pdev, cfg_addr+0x10, val);
-
 	return 0;
 }
 
 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;
+	void __iomem *base = ap->ioaddr.scr_addr + link->pmp * 0x10;
 
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
@@ -192,39 +172,23 @@ static int sis_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
 	if (ap->flags & SIS_FLAG_CFGSCR)
 		return sis_scr_cfg_read(link, sc_reg, val);
 
-	pci_read_config_byte(pdev, SIS_PMR, &pmr);
-
-	*val = ioread32(ap->ioaddr.scr_addr + (sc_reg * 4));
-
-	if ((pdev->device == 0x0182) || (pdev->device == 0x0183) ||
-	    (pdev->device == 0x1182) || (pmr & SIS_PMR_COMBINED))
-		*val |= ioread32(ap->ioaddr.scr_addr + (sc_reg * 4) + 0x10);
-
-	*val &= 0xfffffffb;
-
+	*val = ioread32(base + sc_reg * 4);
 	return 0;
 }
 
 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;
+	void __iomem *base = ap->ioaddr.scr_addr + link->pmp * 0x10;
 
 	if (sc_reg > SCR_CONTROL)
 		return -EINVAL;
 
-	pci_read_config_byte(pdev, SIS_PMR, &pmr);
-
 	if (ap->flags & SIS_FLAG_CFGSCR)
 		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) ||
-		    (pdev->device == 0x1182) || (pmr & SIS_PMR_COMBINED))
-			iowrite32(val, ap->ioaddr.scr_addr + (sc_reg * 4)+0x10);
-		return 0;
-	}
+
+	iowrite32(val, base + (sc_reg * 4));
+	return 0;
 }
 
 static int sis_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
@@ -236,7 +200,7 @@ static int sis_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	u32 genctl, val;
 	u8 pmr;
 	u8 port2_start = 0x20;
-	int rc;
+	int i, rc;
 
 	if (!printed_version++)
 		dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
@@ -319,6 +283,17 @@ static int sis_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (rc)
 		return rc;
 
+	for (i = 0; i < 2; i++) {
+		struct ata_port *ap = host->ports[i];
+
+		if (ap->flags & ATA_FLAG_SATA &&
+		    ap->flags & ATA_FLAG_SLAVE_POSS) {
+			rc = ata_slave_link_init(ap);
+			if (rc)
+				return rc;
+		}
+	}
+
 	if (!(pi.flags & SIS_FLAG_CFGSCR)) {
 		void __iomem *mmio;