[PATCH 3/3] ata: Add Intel SCH PATA support

[alek du <alek.du@intel.com>]

This patch adds Intel SCH chipsets (US15W, US15L, UL11L) PATA controller
support.

Signed-off-by: Alek Du <alek.du@intel.com>
---
 drivers/ata/ata_piix.c |   40 ++++++++++++++++++++++++++++++++++++++--
 drivers/ide/pci/piix.c |    2 ++
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index b7c38ee..7f95a9a 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -214,6 +214,8 @@ static const struct pci_device_id piix_pci_tbl[] = {
 	/* ICH7/7-R (i945, i975) UDMA 100*/
 	{ 0x8086, 0x27DF, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
 	{ 0x8086, 0x269E, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
+	/* INTEL SCH UDMA 100 */
+	{ 0x8086, 0x811A, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
 	/* ICH8 Mobile PATA Controller */
 	{ 0x8086, 0x2850, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
 
@@ -561,6 +563,10 @@ struct ich_laptop {
 	u16 subdevice;
 };
 
+struct sch_80 {
+	u16 device;
+};
+
 /*
  *	List of laptops that use short cables rather than 80 wire
  */
@@ -577,6 +583,17 @@ static const struct ich_laptop ich_laptop[] = {
 	{ 0, }
 };
 
+/*
+ *	List of chipsets whose port IOCFG and enable bit registers are reserved
+ */
+
+static const struct sch_80 sch_80[] = {
+	/* devid */
+	{ 0x811A },	/* Intel SCH chipset */
+	/* end marker */
+	{ 0, }
+};
+
 /**
  *	ich_pata_cable_detect - Probe host controller cable detect info
  *	@ap: Port for which cable detect info is desired
@@ -592,6 +609,7 @@ static int ich_pata_cable_detect(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	const struct ich_laptop *lap = &ich_laptop[0];
+	const struct sch_80 *sch = &sch_80[0];
 	u8 tmp, mask;
 
 	/* Check for specials - Acer Aspire 5602WLMi */
@@ -604,6 +622,13 @@ static int ich_pata_cable_detect(struct ata_port *ap)
 		lap++;
 	}
 
+	/* Check for specials - Intel SCH chipset */
+	while (sch->device) {
+		if (sch->device == pdev->device)
+			return ATA_CBL_PATA80;
+		sch++;
+	}
+
 	/* check BIOS cable detect results */
 	mask = ap->port_no == 0 ? PIIX_80C_PRI : PIIX_80C_SEC;
 	pci_read_config_byte(pdev, PIIX_IOCFG, &tmp);
@@ -624,9 +649,20 @@ static int piix_pata_prereset(struct ata_link *link, unsigned long deadline)
 {
 	struct ata_port *ap = link->ap;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+	const struct sch_80 *sch = &sch_80[0];
+	int skip_check = 0;
 
-	if (!pci_test_config_bits(pdev, &piix_enable_bits[ap->port_no]))
-		return -ENOENT;
+	/* Check for specials - Intel SCH chipset */
+	while (sch->device) {
+		if (sch->device == pdev->device) {
+			skip_check = 1;
+			break;
+		}
+		sch++;
+	}
+	if (!skip_check)
+		if (!pci_test_config_bits(pdev, &piix_enable_bits[ap->port_no]))
+			return -ENOENT;
 	return ata_sff_prereset(link, deadline);
 }
 
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index decef0f..dce830b 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -377,6 +377,7 @@ static const struct ide_port_info piix_pci_info[] __devinitdata = {
 	/* 22 */ DECLARE_ICH_DEV("ICH4",	ATA_UDMA5),
 	/* 23 */ DECLARE_ICH_DEV("ESB2",	ATA_UDMA5),
 	/* 24 */ DECLARE_ICH_DEV("ICH8M",	ATA_UDMA5),
+	/* 25 */ DECLARE_ICH_DEV("SCH",		ATA_UDMA5),
 };
 
 /**
@@ -450,6 +451,7 @@ static const struct pci_device_id piix_pci_tbl[] = {
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801DB_1),  22 },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ESB2_18),    23 },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICH8_6),     24 },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_IDE),	25 },
 	{ 0, },
 };
 MODULE_DEVICE_TABLE(pci, piix_pci_tbl);
-- 
1.5.2.5