[PATCH] Add support for SGI's IOC4 chipset

From: Aniket Malatpure <aniket@sgi.com>

Adds support for the IOC4 IDE part.

drivers/ide/Kconfig

@@ -745,6 +745,14 @@ config BLK_DEV_SVWKS
 	  This driver adds PIO/(U)DMA support for the ServerWorks OSB4/CSB5
 	  chipsets.
 
+config BLK_DEV_SGIIOC4
+	tristate "Silicon Graphics IOC4 chipset support"
+	depends on IA64_SGI_SN2
+	help
+	  This driver adds PIO & MultiMode DMA-2 support for the SGI IOC4
+	  chipset, which has one channel and can support two devices.
+	  Please say Y here if you have an Altix System from SGI.
+
 config BLK_DEV_SIIMAGE
 	tristate "Silicon Image chipset support"
 	help

drivers/ide/arm/icside.c

@@ -214,7 +214,7 @@ static void icside_maskproc(ide_drive_t *drive, int mask)
 #define NR_ENTRIES 256
 #define TABLE_SIZE (NR_ENTRIES * 8)
 
-static void ide_build_sglist(ide_drive_t *drive, struct request *rq)
+static void icside_build_sglist(ide_drive_t *drive, struct request *rq)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct icside_state *state = hwif->hwif_data;
@@ -543,7 +543,7 @@ icside_dma_common(ide_drive_t *drive, struct request *rq,
 	BUG_ON(hwif->sg_dma_active);
 	BUG_ON(dma_channel_active(hwif->hw.dma));
 
-	ide_build_sglist(drive, rq);
+	icside_build_sglist(drive, rq);
 
 	/*
 	 * Ensure that we have the right interrupt routed.

drivers/ide/ide-dma.c

@@ -200,8 +200,8 @@ EXPORT_SYMBOL_GPL(ide_dma_intr);
  *	kernel provide the necessary cache management so that we can
  *	operate in a portable fashion
  */
- 
-static int ide_build_sglist (ide_drive_t *drive, struct request *rq)
+
+int ide_build_sglist(ide_drive_t *drive, struct request *rq)
 {
 	ide_hwif_t *hwif = HWIF(drive);
 	struct scatterlist *sg = hwif->sg_table;
@@ -220,6 +220,8 @@ static int ide_build_sglist (ide_drive_t *drive, struct request *rq)
 	return pci_map_sg(hwif->pci_dev, sg, nents, hwif->sg_dma_direction);
 }
 
+EXPORT_SYMBOL_GPL(ide_build_sglist);
+
 /**
  *	ide_raw_build_sglist	-	map IDE scatter gather for DMA
  *	@drive: the drive to build the DMA table for
@@ -230,8 +232,8 @@ static int ide_build_sglist (ide_drive_t *drive, struct request *rq)
  *	of the  kernel provide the necessary cache management so that we can
  *	operate in a portable fashion
  */
- 
-static int ide_raw_build_sglist (ide_drive_t *drive, struct request *rq)
+
+int ide_raw_build_sglist(ide_drive_t *drive, struct request *rq)
 {
 	ide_hwif_t *hwif = HWIF(drive);
 	struct scatterlist *sg = hwif->sg_table;
@@ -270,6 +272,8 @@ static int ide_raw_build_sglist (ide_drive_t *drive, struct request *rq)
 	return pci_map_sg(hwif->pci_dev, sg, nents, hwif->sg_dma_direction);
 }
 
+EXPORT_SYMBOL_GPL(ide_raw_build_sglist);
+
 /**
  *	ide_build_dmatable	-	build IDE DMA table
  *

drivers/ide/pci/Makefile

@@ -21,6 +21,7 @@ obj-$(CONFIG_BLK_DEV_PDC202XX_NEW)	+= pdc202xx_new.o
 obj-$(CONFIG_BLK_DEV_PIIX)		+= piix.o
 obj-$(CONFIG_BLK_DEV_RZ1000)		+= rz1000.o
 obj-$(CONFIG_BLK_DEV_SVWKS)		+= serverworks.o
+obj-$(CONFIG_BLK_DEV_SGIIOC4)		+= sgiioc4.o
 obj-$(CONFIG_BLK_DEV_SIIMAGE)		+= siimage.o
 obj-$(CONFIG_BLK_DEV_SIS5513)		+= sis5513.o
 obj-$(CONFIG_BLK_DEV_SL82C105)		+= sl82c105.o

include/linux/ide.h

@@ -1693,6 +1693,8 @@ extern void ide_setup_pci_devices(struct pci_dev *, struct pci_dev *, ide_pci_de
 #define GOOD_DMA_DRIVE		1
 
 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
+extern int ide_build_sglist(ide_drive_t *, struct request *);
+extern int ide_raw_build_sglist(ide_drive_t *, struct request *);
 extern int ide_build_dmatable(ide_drive_t *, struct request *);
 extern void ide_destroy_dmatable(ide_drive_t *);
 extern ide_startstop_t ide_dma_intr(ide_drive_t *);

include/linux/pci_ids.h

@@ -900,6 +900,7 @@
 
 #define PCI_VENDOR_ID_SGI		0x10a9
 #define PCI_DEVICE_ID_SGI_IOC3		0x0003
+#define PCI_DEVICE_ID_SGI_IOC4		0x100a
 #define PCI_VENDOR_ID_SGI_LITHIUM	0x1002
 
 #define PCI_VENDOR_ID_ACC		0x10aa