[PATCH] (2.4.22-pre6 BK) New (IDE) driver: SGI IOC4

* [PATCH] (2.4.22-pre6 BK) New (IDE) driver: SGI IOC4
@ 2003-07-15 22:27 Christopher Wedgwood
  2003-07-15 23:47 ` Jeff Garzik
  2003-07-17 12:26 ` Alan Cox
  0 siblings, 2 replies; 4+ messages in thread
From: Christopher Wedgwood @ 2003-07-15 22:27 UTC (permalink / raw)
  To: Marcelo Tosatti, Alan Cox; +Cc: linux-kernel, wildos

Hi there!

This patch (against the 2.4 BK tree as of a few minutes ago) adds
support for SGI IOC4 IDE driver as found in SN2/Altix systems
(http://sgi.com/altix for more details).

No generic/non-sn2 code paths should be affected by this.

 Documentation/Configure.help |    6
 MAINTAINERS                  |    5
 drivers/ide/Config.in        |    1
 drivers/ide/pci/Makefile     |    1
 drivers/ide/pci/sgiioc4.c    |  997 ++++++++++++++++++++++++++++++++++++++
 drivers/ide/pci/sgiioc4.h    |  181 ++++++
 include/linux/pci_ids.h      |    1
 7 files changed, 1192 insertions(+)

Pending any nasties please apply!


Thanks,
  --cw


# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
#	           ChangeSet	1.1122  -> 1.1123 
#	drivers/ide/pci/Makefile	1.4     -> 1.5    
#	include/linux/pci_ids.h	1.66    -> 1.67   
#	         MAINTAINERS	1.101   -> 1.102  
#	drivers/ide/Config.in	1.34    -> 1.35   
#	Documentation/Configure.help	1.169   -> 1.170  
#	               (new)	        -> 1.1     drivers/ide/pci/sgiioc4.h
#	               (new)	        -> 1.1     drivers/ide/pci/sgiioc4.c
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 03/07/15	cw@taniwha.engr.sgi.com	1.1123
# Add IDE driver for SGI's IOC4 hardware (found on Altix/SN2 systems)
# --------------------------------------------
#
diff -Nru a/Documentation/Configure.help b/Documentation/Configure.help

--- a/Documentation/Configure.help	Tue Jul 15 15:16:49 2003
+++ b/Documentation/Configure.help	Tue Jul 15 15:16:50 2003
@@ -1203,6 +1203,12 @@
   This driver adds PIO/(U)DMA support for the ServerWorks OSB4/CSB5
   chipsets.
 
+SGI IOC4 chipset support
+CONFIG_BLK_DEV_SGIIOC4
+  This driver adds PIO & MultiMode DMA-2 support for the SGI IOC4
+  chipset.  Please say Y here, if you have an Altix System from
+  Silicon Graphics Inc.
+
 Intel PIIXn chipsets support
 CONFIG_BLK_DEV_PIIX
   This driver adds PIO mode setting and tuning for all PIIX IDE
diff -Nru a/MAINTAINERS b/MAINTAINERS
--- a/MAINTAINERS	Tue Jul 15 15:16:49 2003
+++ b/MAINTAINERS	Tue Jul 15 15:16:49 2003
@@ -890,6 +890,11 @@
 L:	linux-mips@linux-mips.org
 S:	Maintained
 
+IOC4 IDE DRIVER
+P:	Aniket Malatpure
+M:	aniket@sgi.com
+S:	Maintained
+
 IP MASQUERADING:
 P:	Juanjo Ciarlante
 M:	jjciarla@raiz.uncu.edu.ar
diff -Nru a/drivers/ide/Config.in b/drivers/ide/Config.in
--- a/drivers/ide/Config.in	Tue Jul 15 15:16:49 2003
+++ b/drivers/ide/Config.in	Tue Jul 15 15:16:49 2003
@@ -71,6 +71,7 @@
 	    dep_tristate '    RZ1000 chipset bugfix/support' CONFIG_BLK_DEV_RZ1000 $CONFIG_X86
 	    dep_tristate '    SCx200 chipset support' CONFIG_BLK_DEV_SC1200 $CONFIG_BLK_DEV_IDEDMA_PCI
 	    dep_tristate '    ServerWorks OSB4/CSB5/CSB6 chipsets support' CONFIG_BLK_DEV_SVWKS $CONFIG_BLK_DEV_IDEDMA_PCI
+	    dep_tristate '    SGI IOC4 chipset support' CONFIG_BLK_DEV_SGIIOC4 $CONFIG_BLK_DEV_IDEDMA_PCI
 	    dep_tristate '    Silicon Image chipset support' CONFIG_BLK_DEV_SIIMAGE $CONFIG_BLK_DEV_IDEDMA_PCI
 	    dep_tristate '    SiS5513 chipset support' CONFIG_BLK_DEV_SIS5513 $CONFIG_BLK_DEV_IDEDMA_PCI $CONFIG_X86
 	    dep_tristate '    SLC90E66 chipset support' CONFIG_BLK_DEV_SLC90E66 $CONFIG_BLK_DEV_IDEDMA_PCI
diff -Nru a/drivers/ide/pci/Makefile b/drivers/ide/pci/Makefile
--- a/drivers/ide/pci/Makefile	Tue Jul 15 15:16:49 2003
+++ b/drivers/ide/pci/Makefile	Tue Jul 15 15:16:49 2003
@@ -25,6 +25,7 @@
 obj-$(CONFIG_BLK_DEV_RZ1000)		+= rz1000.o
 obj-$(CONFIG_BLK_DEV_SVWKS)		+= serverworks.o
 obj-$(CONFIG_BLK_DEV_SC1200)		+= sc1200.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
diff -Nru a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ b/drivers/ide/pci/sgiioc4.c	Tue Jul 15 15:16:50 2003
@@ -0,0 +1,997 @@
+/*
+ * Copyright (c) 2003 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/NoticeExplan
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/hdreg.h>
+#include <linux/init.h>
+#include <asm/io.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+
+#include "sgiioc4.h"
+
+#ifdef CONFIG_PROC_FS
+static u8 sgiioc4_proc = 0;
+#endif
+static int n_sgiioc4_devs = 0;
+
+int sgiioc4_debug = 0;
+
+#if 0
+extern int dma_timer_expiry(ide_drive_t * drive);
+#endif
+
+static inline void
+IDE_DBG(int debuglevel, char *format, ...)
+{
+	va_list ap;
+	char tempstr[256];
+
+	if (sgiioc4_debug >= debuglevel) {
+		va_start(ap, format);
+		vsprintf(tempstr, format, ap);
+		printk(tempstr);
+		va_end(ap);
+	}
+}
+
+static inline void
+xide_delay(long ticks)
+{
+	if (!ticks)
+		return;
+
+	current->state = TASK_INTERRUPTIBLE;
+	schedule_timeout(ticks);
+	return;
+}
+
+void
+sgiioc4_ide_setup_pci_device(struct pci_dev *dev, const char *name)
+{
+	unsigned long base = 0, ctl = 0, dma_base = 0, irqport = 0;
+	ide_hwif_t *hwif = NULL;
+	int h = 0;
+
+	/*  Get the CmdBlk and CtrlBlk Base Registers */
+	base = pci_resource_start(dev, 0) + IOC4_CMD_OFFSET;
+	ctl = pci_resource_start(dev, 0) + IOC4_CTRL_OFFSET;
+	irqport = pci_resource_start(dev, 0) + IOC4_INTR_OFFSET;
+	dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
+
+	for (h = 0; h < MAX_HWIFS; ++h) {
+		hwif = &ide_hwifs[h];
+		if (hwif->chipset == ide_unknown) {	/* Find an empty HWIF */
+			break;
+		}
+	}
+
+	if (hwif->io_ports[IDE_DATA_OFFSET] != base) {
+		/* Initialize the IO registers */
+		sgiioc4_init_hwif_ports(&hwif->hw, base, ctl, irqport);
+		memcpy(hwif->io_ports, hwif->hw.io_ports,
+		       sizeof (hwif->io_ports));
+		hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
+	}
+	hwif->chipset = ide_pci;
+	hwif->pci_dev = dev;
+	hwif->channel = 0;	/* Single Channel chip */
+	hwif->hw.ack_intr = &sgiioc4_checkirq;	/* MultiFunction Chip */
+
+	/* Initializing chipset IRQ Registers */
+	hwif->OUTL(0x03, irqport + IOC4_INTR_SET * 4);
+
+	if (dma_base) {
+		ide_dma_sgiioc4(hwif, dma_base);
+	} else {
+		printk("%s: %s Bus-Master DMA disabled \n", hwif->name, name);
+	}
+
+	(void) ide_init_sgiioc4(hwif);
+	return;
+}
+
+unsigned int __init
+pci_init_sgiioc4(struct pci_dev *dev, const char *name)
+{
+	unsigned int class_rev;
+
+	pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
+	class_rev &= 0xff;
+
+	pci_enable_device(dev);
+	pci_set_master(dev);
+#if defined(CONFIG_IA64_SGI_SN2) || defined(CONFIG_IA64_GENERIC)
+	/* Enable Byte Swapping in the PIC */
+	snia_pciio_endian_set(dev, PCIDMA_ENDIAN_LITTLE, PCIDMA_ENDIAN_BIG);
+#endif
+
+#ifdef CONFIG_PROC_FS
+	sgiioc4_devs[n_sgiioc4_devs++] = dev;
+	if (!sgiioc4_proc) {
+		sgiioc4_proc = 1;
+		ide_pci_register_host_proc(&sgiioc4_procs[0]);
+	}
+#endif
+	sgiioc4_ide_setup_pci_device(dev, name);
+	return 0;
+}
+
+void
+sgiioc4_init_hwif_ports(hw_regs_t * hw, ide_ioreg_t data_port,
+			ide_ioreg_t ctrl_port, ide_ioreg_t irq_port)
+{
+	ide_ioreg_t reg = data_port;
+	int i;
+
+	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
+		hw->io_ports[i] = reg + i * 4;	/* Registers are word (32 bit) aligned */
+	}
+
+	if (ctrl_port) {
+		hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
+	}
+
+	if (irq_port) {
+		hw->io_ports[IDE_IRQ_OFFSET] = irq_port;
+	}
+
+	return;
+}
+
+void
+sgiioc4_resetproc(ide_drive_t * drive)
+{
+	sgiioc4_ide_dma_end(drive);
+	sgiioc4_clearirq(drive);
+}
+
+void
+sgiioc4_maskproc(ide_drive_t * drive, int mask)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	if (IDE_CONTROL_REG)
+		hwif->OUTB(mask ? (drive->ctl | 2) : (drive->ctl & ~2),
+			   IDE_CONTROL_REG);
+}
+
+void __init
+ide_init_sgiioc4(ide_hwif_t * hwif)
+{
+	hwif->autodma = 1;
+	hwif->index = 0;	/* Channel 0 */
+	hwif->channel = 0;
+	hwif->atapi_dma = 1;
+	hwif->ultra_mask = 0x0;	/* Disable Ultra DMA */
+	hwif->mwdma_mask = 0x2;	/* Multimode-2 DMA  */
+	hwif->swdma_mask = 0x2;
+	hwif->identify = NULL;
+	hwif->tuneproc = NULL;	/* Sets timing for PIO mode */
+	hwif->speedproc = NULL;	/* Sets timing for DMA &/or PIO modes */
+	hwif->selectproc = NULL;	/* Use the default selection routine to select drive */
+	hwif->reset_poll = NULL;	/* No HBA specific reset_poll needed */
+	hwif->pre_reset = NULL;	/* No HBA specific pre_set needed */
+	hwif->resetproc = &sgiioc4_resetproc;	/* Reset the IOC4 DMA engine, clear interrupts etc */
+	hwif->intrproc = NULL;	/* Enable or Disable interrupt from drive */
+	hwif->maskproc = &sgiioc4_maskproc;	/* Mask on/off NIEN register */
+	hwif->quirkproc = NULL;
+	hwif->busproc = NULL;
+
+	hwif->ide_dma_read = &sgiioc4_ide_dma_read;
+	hwif->ide_dma_write = &sgiioc4_ide_dma_write;
+	hwif->ide_dma_begin = &sgiioc4_ide_dma_begin;
+	hwif->ide_dma_end = &sgiioc4_ide_dma_end;
+	hwif->ide_dma_check = &sgiioc4_ide_dma_check;
+	hwif->ide_dma_on = &sgiioc4_ide_dma_on;
+	hwif->ide_dma_off = &sgiioc4_ide_dma_off;
+	hwif->ide_dma_off_quietly = &sgiioc4_ide_dma_off_quietly;
+	hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
+	hwif->ide_dma_host_on = &sgiioc4_ide_dma_host_on;
+	hwif->ide_dma_host_off = &sgiioc4_ide_dma_host_off;
+	hwif->ide_dma_bad_drive = &__ide_dma_bad_drive;
+	hwif->ide_dma_good_drive = &__ide_dma_good_drive;
+	hwif->ide_dma_count = &sgiioc4_ide_dma_count;
+	hwif->ide_dma_verbose = &sgiioc4_ide_dma_verbose;
+	hwif->ide_dma_retune = &__ide_dma_retune;
+	hwif->ide_dma_lostirq = &sgiioc4_ide_dma_lostirq;
+	hwif->ide_dma_timeout = &sgiioc4_ide_dma_timeout;
+	hwif->INB = &sgiioc4_INB;
+	return;
+}
+
+static int
+sgiioc4_ide_dma_read(ide_drive_t * drive)
+{
+	struct request *rq = HWGROUP(drive)->rq;
+	unsigned int count = 0;
+#if 0
+	task_ioreg_t command = WIN_NOP;
+	u8 lba48 = (drive->addressing == 1) ? 1 : 0;
+#endif
+
+	if (!(count = sgiioc4_build_dma_table(drive, rq, PCI_DMA_FROMDEVICE))) {
+		/* try PIO instead of DMA */
+		return 1;
+	}
+	sgiioc4_configure_for_dma(IOC4_DMA_WRITE, drive);
+	/* Writes FROM the IOC4 TO Main Memory */
+	if (drive->media != ide_disk)	/* Command will be issued by the cdrom.c layer */
+		return 0;
+
+	return 0;
+#if 0
+	/* Hard Disks not supported on IOC4 as yet (05/22/2003) ... this code will be useful when Disks are supported */
+	command = (lba48) ? WIN_READDMA_EXT : WIN_READDMA;
+	if (rq->cmd == IDE_DRIVE_TASKFILE) {
+		ide_task_t *args = rq->special;
+		command = args->tfRegister[IDE_COMMAND_OFFSET];
+	}
+
+	/* issue cmd to drive */
+	ide_execute_command(drive, command, &ide_dma_intr, 2 * WAIT_CMD,
+			    dma_timer_expiry);
+	return HWIF(drive)->ide_dma_count(drive);
+#endif
+}
+
+static int
+sgiioc4_ide_dma_write(ide_drive_t * drive)
+{
+	struct request *rq = HWGROUP(drive)->rq;
+	unsigned int count = 0;
+#if 0
+	task_ioreg_t command = WIN_NOP;
+	u8 lba48 = (drive->addressing == 1) ? 1 : 0;
+#endif
+
+	if (!(count = sgiioc4_build_dma_table(drive, rq, PCI_DMA_TODEVICE))) {
+		/* try PIO instead of DMA */
+		return 1;
+	}
+	sgiioc4_configure_for_dma(IOC4_DMA_READ, drive);
+	/* Writes TO the IOC4 FROM Main Memory */
+
+	if (drive->media != ide_disk)	/* Command will be issued by the cdrom.c layer */
+		return 0;
+
+	return 0;
+#if 0
+	/* Hard Disks not supported on IOC4 as yet (05/22/2003) ... this code will be useful when Disks are supported */
+	command = (lba48) ? WIN_READDMA_EXT : WIN_READDMA;
+	if (rq->cmd == IDE_DRIVE_TASKFILE) {
+		ide_task_t *args = rq->special;
+		command = args->tfRegister[IDE_COMMAND_OFFSET];
+	}
+
+	/* issue cmd to drive */
+	ide_execute_command(drive, command, &ide_dma_intr, 2 * WAIT_CMD,
+			    dma_timer_expiry);
+	return HWIF(drive)->ide_dma_count(drive);
+#endif
+}
+
+static int
+sgiioc4_ide_dma_begin(ide_drive_t * drive)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	unsigned int reg = hwif->INL(hwif->dma_base + IOC4_DMA_CTRL * 4);
+	unsigned int temp_reg = reg | IOC4_S_DMA_START;
+
+	hwif->OUTL(temp_reg, hwif->dma_base + IOC4_DMA_CTRL * 4);
+	return 0;
+}
+
+/* Stops the IOC4 DMA Engine */
+static int
+sgiioc4_ide_dma_end(ide_drive_t * drive)
+{
+	u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
+	ide_hwif_t *hwif = HWIF(drive);
+	uint64_t dma_base = hwif->dma_base;
+	int dma_stat = 0, count;
+	unsigned long *ending_dma = (unsigned long *) hwif->dma_base2;
+
+	hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+
+	count = 0;
+	do {
+		xide_delay(count);
+		ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+		count += 10;
+	} while ((ioc4_dma & IOC4_S_DMA_STOP) && (count < 100));
+
+	if (ioc4_dma & IOC4_S_DMA_STOP) {
+		IDE_DBG(0,
+			"sgiioc4_stopdma(%s): IOC4 DMA STOP bit is still 1 : ioc4_dma_reg 0x%x | address 0x%p\n",
+			drive->name, ioc4_dma, dma_base + IOC4_DMA_CTRL * 4);
+		dma_stat = 1;
+	}
+
+	if (ending_dma) {
+		do {
+			for (num = 0; num < 16; num++) {
+				if (ending_dma[num] & (~0ul)) {
+					valid = 1;
+					break;
+				}
+			}
+			xide_delay(cnt);
+		} while ((cnt++ < 100) && (!valid));
+	}
+
+	if (!valid) {
+		printk(KERN_INFO "sgiioc4_ide_dma_end(%s) : Stale DMA \n",
+		       drive->name);
+	}
+
+	bc_dev = hwif->INL(dma_base + IOC4_BC_DEV * 4);
+	bc_mem = hwif->INL(dma_base + IOC4_BC_MEM * 4);
+
+	if ((bc_dev & 0x01FF) || (bc_mem & 0x1FF)) {
+		if (bc_dev > bc_mem + 8) {
+			IDE_DBG(0,
+				"sgiioc4_ide_dma_end(%s) : WARNING!!! byte_count_at_dev %d != byte_count_at_mem %d\n",
+				drive->name, bc_dev, bc_mem);
+		}
+	}
+
+	drive->waiting_for_dma = 0;
+	ide_destroy_dmatable(drive);
+
+	return dma_stat;
+}
+
+static int
+sgiioc4_ide_dma_check(ide_drive_t * drive)
+{
+	sgiioc4_config_drive_for_dma(drive);
+	return 0;
+}
+
+static int
+sgiioc4_ide_dma_on(ide_drive_t * drive)
+{
+	drive->using_dma = 1;
+	return HWIF(drive)->ide_dma_host_on(drive);
+}
+
+static int
+sgiioc4_ide_dma_off(ide_drive_t * drive)
+{
+	printk(KERN_INFO "%s: DMA disabled\n", drive->name);
+	return HWIF(drive)->ide_dma_off_quietly(drive);
+}
+
+static int
+sgiioc4_ide_dma_off_quietly(ide_drive_t * drive)
+{
+	drive->using_dma = 0;
+	return HWIF(drive)->ide_dma_host_off(drive);
+}
+
+/* returns 1 if dma irq issued, 0 otherwise */
+static int
+sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
+{
+	return (sgiioc4_checkirq(HWIF(drive)));
+}
+
+static int
+sgiioc4_ide_dma_host_on(ide_drive_t * drive)
+{
+	if (drive->using_dma) {
+		return 0;
+	}
+	return 1;
+}
+
+static int
+sgiioc4_ide_dma_host_off(ide_drive_t * drive)
+{
+	sgiioc4_clearirq(drive);
+	return 0;
+}
+
+static int
+sgiioc4_ide_dma_count(ide_drive_t * drive)
+{
+	return HWIF(drive)->ide_dma_begin(drive);
+}
+
+static int
+sgiioc4_ide_dma_verbose(ide_drive_t * drive)
+{
+	printk(", UDMA(16)");
+	return 1;
+}
+
+static int
+sgiioc4_ide_dma_lostirq(ide_drive_t * drive)
+{
+	if (HWIF(drive)->resetproc != NULL)
+		HWIF(drive)->resetproc(drive);
+	return __ide_dma_lostirq(drive);
+}
+
+static int
+sgiioc4_ide_dma_timeout(ide_drive_t * drive)
+{
+	printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
+	if (HWIF(drive)->ide_dma_test_irq(drive))
+		return 0;
+	return HWIF(drive)->ide_dma_end(drive);
+}
+
+static u8
+sgiioc4_INB(unsigned long port)
+{
+	u8 reg = (u8) inb(port);
+
+	if ((port & 0xFFF) == 0x11C) {	/* Status register of IOC4 */
+		if (reg & 0x50) {	/* Not busy...check for interrupt */
+			unsigned long other_ir = port - 0x110;
+			unsigned int intr_reg = (u32) inl(other_ir);
+
+			if (intr_reg & 0x03) {
+				/* Clear the Interrupt, Error bits on the IOC4 */
+				outl(0x03, other_ir);
+				intr_reg = (u32) inl(other_ir);
+			}
+		}
+	}
+	return reg;
+}
+
+/* Creates a dma map for the scatter-gather list entries */
+void __init
+ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base)
+{
+	int num_ports = sizeof (ioc4_dma_regs_t);
+
+	IDE_DBG(0, "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name, dma_base,
+		dma_base + num_ports - 1);
+	if (check_region(dma_base, num_ports)) {
+		IDE_DBG(0,
+			"ide_dma_sgiioc4(%s) -- Error, Port Addresses 0x%p to 0x%p ALREADY in use\n",
+			hwif->name, dma_base, dma_base + num_ports - 1);
+		return;
+	}
+	request_region(dma_base, num_ports, hwif->name);
+	hwif->dma_base = dma_base;
+	hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
+						  IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,	/* 1 Page */
+						  &hwif->dmatable_dma);
+	if (hwif->dmatable_cpu == NULL)
+		goto dma_alloc_failure;
+
+	hwif->sg_table = kmalloc(sizeof (struct scatterlist) * IOC4_PRD_ENTRIES,
+				 GFP_KERNEL);
+	if (hwif->sg_table == NULL) {
+		pci_free_consistent(hwif->pci_dev,
+				    IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
+				    hwif->dmatable_cpu, hwif->dmatable_dma);
+		goto dma_alloc_failure;
+	}
+
+
+	hwif->dma_base2 = (unsigned long) pci_alloc_consistent(hwif->pci_dev,
+							       IOC4_IDE_CACHELINE_SIZE,
+							       (dma_addr_t*)&(hwif->dma_status));
+	if (!(hwif->dma_base2)) {
+		IDE_DBG(0,
+			"ide_dma_sgiioc4(%s) - Couldnot allocate map for Ending DMA \n",
+			hwif->name);
+	}
+
+	return;
+
+      dma_alloc_failure:
+	IDE_DBG(0,
+		"ide_dma_sgiioc4() -- Error! Unable to allocate DMA tables for drive %s\n",
+		hwif->name);
+}
+
+/* Sets the ATAPI Drive to do DMA in Multimode-2 */
+void
+sgiioc4_config_drive_for_dma(ide_drive_t * drive)
+{
+	u8 status_val;
+	ide_hwif_t *hwif = HWIF(drive);
+
+	hwif->OUTB(drive->select.all, IDE_SELECT_REG);
+	hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
+	hwif->OUTB(0x0, IDE_DATA_REG);
+	hwif->OUTB(0x0, IDE_SECTOR_REG);
+	hwif->OUTB(0x0, IDE_LCYL_REG);
+	hwif->OUTB(0x0, IDE_HCYL_REG);
+	hwif->OUTB(0x22, IDE_NSECTOR_REG);
+	hwif->OUTB(0x03, IDE_FEATURE_REG);
+	hwif->OUTB(0xEF, IDE_COMMAND_REG);
+
+	do {
+		xide_delay(HZ);
+		status_val = hwif->INB(IDE_STATUS_REG);
+	} while (status_val & 0x80);
+
+	if (status_val == 0x50) {
+		IDE_DBG(1, "Successfully set %s in Multimode-2 DMA mode \n",
+			drive->name);
+		drive->using_dma = 1;
+	} else {		/* Go to PIO mode if this occurs */
+		IDE_DBG(0,
+			"Couldnot set %s in Multimode-2 DMA mode | status 0x%x | Drive %s using PIO \n",
+			drive->name, status_val, drive->name);
+		drive->using_dma = 0;
+	}
+	return;
+}
+
+/* Initializes the IOC4 DMA Engine */
+void
+sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
+{
+	u32 ioc4_dma;
+	int count;
+	ide_hwif_t *hwif = HWIF(drive);
+	uint64_t dma_base = hwif->dma_base;
+
+	ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+
+	if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
+		IDE_DBG(0,
+			"sgiioc4_configure_for__dma(%s):Warning!! IOC4 DMA was active in previous transfer\n",
+			drive->name);
+		hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+		count = 0;
+		do {
+			xide_delay(count);
+			ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+			count += 10;
+		} while ((ioc4_dma & IOC4_S_DMA_STOP) && (count < 100));
+		if (ioc4_dma & IOC4_S_DMA_STOP) {
+			IDE_DBG(0,
+				"sgiioc4_configure_for__dma(%s) : IOC4 Dma STOP bit is still 1\n",
+				drive->name);
+		}
+	}
+
+	ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+	if (ioc4_dma & IOC4_S_DMA_ERROR) {
+		IDE_DBG(0,
+			"sgiioc4_configure_for__dma(%s) : Warning!! - DMA Error during Previous transfer | status 0x%x \n",
+			drive->name, ioc4_dma);
+		hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+		count = 0;
+		do {
+			ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+			xide_delay(count);
+			count += 10;
+		} while ((ioc4_dma & IOC4_S_DMA_STOP) && (count < 100));
+		if (ioc4_dma & IOC4_S_DMA_STOP) {
+			IDE_DBG(0,
+				"sgiioc4_configure_for__dma(%s) : IOC4 DMA STOP bit is still 1\n",
+				drive->name);
+		}
+	}
+
+	{
+		uint32_t dma_addr, ending_dma_addr;
+
+		/* Address of the Scatter Gather List */
+		dma_addr = cpu_to_le32(hwif->dmatable_dma);
+		hwif->OUTL(dma_addr, dma_base + IOC4_DMA_PTR_L * 4);
+
+		/* Address of the Ending DMA */
+		if (hwif->dma_base2) {
+			memset((unsigned int *) hwif->dma_base2, 0,
+			       IOC4_IDE_CACHELINE_SIZE);
+			ending_dma_addr = cpu_to_le32(hwif->dma_status);
+			hwif->OUTL(ending_dma_addr,
+				   dma_base + IOC4_DMA_END_ADDR * 4);
+		}
+	}
+
+	hwif->OUTL(dma_direction, dma_base + IOC4_DMA_CTRL * 4);
+	drive->waiting_for_dma = 1;
+
+}
+
+int
+sgiioc4_dma_test_irq(ide_drive_t * drive)
+{
+	u8 stat;
+
+	if (sgiioc4_checkirq(HWIF(drive))) {	/* Valid IDE interrupt */
+#ifdef CONFIG_IDEPCI_SHARE_IRQ
+		/*
+		 * We do a passive status test under shared PCI interrupts on
+		 * cards that truly share the ATA side interrupt, but may also share
+		 * an interrupt with another pci card/device.  We make no assumptions
+		 * about possible isa-pnp and pci-pnp issues yet.
+		 */
+		if (IDE_CONTROL_REG)
+			stat = HWIF(drive)->INB(IDE_CONTROL_REG);
+
+		else
+#endif				/* CONFIG_IDEPCI_SHARE_IRQ */
+			stat = HWIF(drive)->INB(IDE_STATUS_REG);	/* Note: this may clear a pending IRQ!! */
+		if (stat & BUSY_STAT)
+			return 0;	/* drive busy:  definitely not interrupting */
+		return 1;	/* drive ready: *might* be interrupting */
+	}
+	return 0;
+}
+
+/* Creates the scatter gather list, DMA Table */
+unsigned int
+sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	unsigned int *table = hwif->dmatable_cpu;
+	unsigned int count = 0, i = 1;
+	struct scatterlist *sg;
+
+	if (rq->cmd == IDE_DRIVE_TASKFILE)
+		hwif->sg_nents = i = sgiioc4_ide_raw_build_sglist(hwif, rq);
+	else
+		hwif->sg_nents = i = sgiioc4_ide_build_sglist(hwif, rq, ddir);
+	if (!i)
+		return 0;	/* sglist of length Zero */
+
+	sg = hwif->sg_table;
+	while (i && sg_dma_len(sg)) {
+		dma_addr_t cur_addr;
+		int cur_len;
+		cur_addr = sg_dma_address(sg);
+		cur_len = sg_dma_len(sg);
+
+		while (cur_len) {
+			if (count++ >= IOC4_PRD_ENTRIES) {
+				printk("%s: DMA table too small\n",
+				       drive->name);
+				goto use_pio_instead;
+			} else {
+				uint32_t xcount, bcount =
+				    0x10000 - (cur_addr & 0xffff);
+
+				if (bcount > cur_len)
+					bcount = cur_len;
+
+				/* put the addr, length in the IOC4 dma-table format */
+				*table = 0x0;
+				table++;
+				*table = cpu_to_be32(cur_addr);
+				table++;
+				*table = 0x0;
+				table++;
+
+				xcount = bcount & 0xffff;
+				*table = cpu_to_be32(xcount);
+				table++;
+
+				cur_addr += bcount;
+				cur_len -= bcount;
+			}
+		}
+
+		sg++;
+		i--;
+	}
+
+	if (count) {
+		table--;
+		*table |= cpu_to_be32(0x80000000);
+		return count;
+	}
+      use_pio_instead:
+	pci_unmap_sg(hwif->pci_dev,
+		     hwif->sg_table, hwif->sg_nents, hwif->sg_dma_direction);
+	hwif->sg_dma_active = 0;
+	return 0;		/* revert to PIO for this request */
+}
+
+static int
+sgiioc4_checkirq(ide_hwif_t * hwif)
+{
+	uint8_t intr_reg =
+	    hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET] + IOC4_INTR_REG * 4);
+
+	if (intr_reg & 0x03) {
+		return 1;
+	}
+
+	return 0;
+
+}
+
+static int
+sgiioc4_clearirq(ide_drive_t * drive)
+{
+	u32 intr_reg;
+	ide_hwif_t *hwif = HWIF(drive);
+	ide_ioreg_t other_ir =
+	    hwif->io_ports[IDE_IRQ_OFFSET] + (IOC4_INTR_REG << 2);
+
+	/* Code to check for PCI error conditions */
+	intr_reg = hwif->INL(other_ir);
+	if (intr_reg & 0x03) {
+		/* Valid IOC4-IDE interrupt */
+		u8 stat = hwif->INB(IDE_STATUS_REG);
+		int count = 0;
+		do {
+			xide_delay(count);
+			stat = hwif->INB(IDE_STATUS_REG);	/* Removes Interrupt from IDE Device */
+		} while ((stat & 0x80) && (count++ < 1024));
+
+		if (intr_reg & 0x02) {
+			/* Error when transferring DMA data on PCI bus */
+			uint32_t pci_err_addr_low, pci_err_addr_high,
+			    pci_stat_cmd_reg;
+
+			pci_err_addr_low =
+			    hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET]);
+			pci_err_addr_high =
+			    hwif->INL(hwif->io_ports[IDE_IRQ_OFFSET] + 4);
+			pci_read_config_dword(hwif->pci_dev, PCI_COMMAND,
+					      &pci_stat_cmd_reg);
+			IDE_DBG(0,
+				"sgiioc4_clearirq(%s) : PCI Bus Error when doing DMA : status-cmd reg is 0x%x \n",
+				drive->name, pci_stat_cmd_reg);
+			IDE_DBG(0,
+				"sgiioc4_clearirq(%s) : PCI Error Address is 0x%x%x \n",
+				drive->name, pci_err_addr_high,
+				pci_err_addr_low);
+			/* Clear the PCI Error indicator */
+			pci_write_config_dword(hwif->pci_dev, PCI_COMMAND,
+					       0x00000146);
+		}
+		hwif->OUTL(0x03, other_ir);	/* Clear the Interrupt, Error bits on the IOC4 */
+
+		intr_reg = hwif->INL(other_ir);
+	}
+	return intr_reg;
+}
+
+/**
+ * 	"Copied from drivers/ide/ide-dma.c"
+ *	sgiioc4_ide_build_sglist	-	map IDE scatter gather for DMA I/O
+ *	@hwif: the interface to build the DMA table for
+ *	@rq: the request holding the sg list
+ *	@ddir: data direction
+ *
+ *	Perform the PCI mapping magic neccessary to access the source or
+ *	target buffers of a request via PCI DMA. The lower layers of the
+ *	kernel provide the neccessary cache management so that we can
+ *	operate in a portable fashion
+ */
+
+static int
+sgiioc4_ide_build_sglist(ide_hwif_t * hwif, struct request *rq, int ddir)
+{
+	struct buffer_head *bh;
+	struct scatterlist *sg = hwif->sg_table;
+	unsigned long lastdataend = ~0UL;
+	int nents = 0;
+
+	if (hwif->sg_dma_active)
+		BUG();
+
+	bh = rq->bh;
+	do {
+		int contig = 0;
+
+		if (bh->b_page) {
+			if (bh_phys(bh) == lastdataend)
+				contig = 1;
+		} else {
+			if ((unsigned long) bh->b_data == lastdataend)
+				contig = 1;
+		}
+
+		if (contig) {
+			sg[nents - 1].length += bh->b_size;
+			lastdataend += bh->b_size;
+			continue;
+		}
+
+		if (nents >= PRD_ENTRIES)
+			return 0;
+
+		memset(&sg[nents], 0, sizeof (*sg));
+
+		if (bh->b_page) {
+			sg[nents].page = bh->b_page;
+			sg[nents].offset = bh_offset(bh);
+			lastdataend = bh_phys(bh) + bh->b_size;
+		} else {
+			if ((unsigned long) bh->b_data < PAGE_SIZE)
+				BUG();
+
+			sg[nents].address = bh->b_data;
+			lastdataend = (unsigned long) bh->b_data + bh->b_size;
+		}
+
+		sg[nents].length = bh->b_size;
+		nents++;
+	} while ((bh = bh->b_reqnext) != NULL);
+
+	if (nents == 0)
+		BUG();
+
+	hwif->sg_dma_direction = ddir;
+	return pci_map_sg(hwif->pci_dev, sg, nents, ddir);
+}
+
+/**
+ * 	Copied from drivers/ide/ide-dma.c
+ *	sgiioc4_ide_raw_build_sglist	-	map IDE scatter gather for DMA
+ *	@hwif: the interface to build the DMA table for
+ *	@rq: the request holding the sg list
+ *
+ *	Perform the PCI mapping magic neccessary to access the source or
+ *	target buffers of a taskfile request via PCI DMA. The lower layers
+ *	of the  kernel provide the neccessary cache management so that we can
+ *	operate in a portable fashion
+ */
+
+static int
+sgiioc4_ide_raw_build_sglist(ide_hwif_t * hwif, struct request *rq)
+{
+	struct scatterlist *sg = hwif->sg_table;
+	int nents = 0;
+	ide_task_t *args = rq->special;
+	u8 *virt_addr = rq->buffer;
+	int sector_count = rq->nr_sectors;
+
+	if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
+		hwif->sg_dma_direction = PCI_DMA_TODEVICE;
+	else
+		hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
+#if 1
+	if (sector_count > 128) {
+		memset(&sg[nents], 0, sizeof (*sg));
+		sg[nents].address = virt_addr;
+		sg[nents].length = 128 * SECTOR_SIZE;
+		nents++;
+		virt_addr = virt_addr + (128 * SECTOR_SIZE);
+		sector_count -= 128;
+	}
+	memset(&sg[nents], 0, sizeof (*sg));
+	sg[nents].address = virt_addr;
+	sg[nents].length = sector_count * SECTOR_SIZE;
+	nents++;
+#else
+	while (sector_count > 128) {
+		memset(&sg[nents], 0, sizeof (*sg));
+		sg[nents].address = virt_addr;
+		sg[nents].length = 128 * SECTOR_SIZE;
+		nents++;
+		virt_addr = virt_addr + (128 * SECTOR_SIZE);
+		sector_count -= 128;
+	};
+	memset(&sg[nents], 0, sizeof (*sg));
+	sg[nents].address = virt_addr;
+	sg[nents].length = sector_count * SECTOR_SIZE;
+	nents++;
+#endif
+	return pci_map_sg(hwif->pci_dev, sg, nents, hwif->sg_dma_direction);
+}
+
+#if defined(CONFIG_PROC_FS)
+
+static int
+sgiioc4_get_info(char *buffer, char **addr, off_t offset, int count)
+{
+	char *p = buffer;
+	unsigned int class_rev;
+	int i = 0;
+
+	while (i < n_sgiioc4_devs) {
+		pci_read_config_dword(sgiioc4_devs[i], PCI_CLASS_REVISION,
+				      &class_rev);
+		class_rev &= 0xff;
+
+		if (sgiioc4_devs[i]->device == PCI_DEVICE_ID_SGI_IOC4) {
+			p +=
+			    sprintf(p, "\n	SGI IOC4 Chipset rev %d. ",
+				    class_rev);
+			p +=
+			    sprintf(p,
+				    "\n	Chipset has 1 IDE channel and supports 2 devices on that channel.");
+			p +=
+			    sprintf(p,
+				    "\n	Chipset supports DMA in MultiMode-2 data transfer protocol.\n");
+		}
+		/* Do we need more info. here ? */
+		i++;
+	}
+	return p - buffer;
+}
+
+#endif
+
+static int __devinit
+sgiioc4_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	ide_pci_device_t *d = &sgiioc4_chipsets[id->driver_data];
+	if (dev->device != d->device) {
+		IDE_DBG(0, "Error in sgiioc4_init_one(dev 0x%p | id 0x%p )\n",
+			(void *) dev, (void *) id);
+		BUG();
+	}
+	printk(KERN_INFO "%s: IDE controller at PCI slot %s\n", d->name,
+	       dev->slot_name);
+	pci_init_sgiioc4(dev, d->name);
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static struct pci_device_id sgiioc4_pci_tbl[] __devinitdata = {
+
+	{PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC4, PCI_ANY_ID, PCI_ANY_ID,
+	 0x0b4000, 0xFFFFFF, 0},
+	{0,}
+};
+
+static struct pci_driver driver = {
+	.name = "SGI-IOC4 IDE",
+	.id_table = sgiioc4_pci_tbl,
+	.probe = sgiioc4_init_one,
+};
+
+static int
+sgiioc4_ide_init(void)
+{
+	return ide_pci_register_driver(&driver);
+}
+
+static void
+sgiioc4_ide_exit(void)
+{
+	ide_pci_unregister_driver(&driver);
+}
+
+module_init(sgiioc4_ide_init);
+module_exit(sgiioc4_ide_exit);
+
+MODULE_AUTHOR("Aniket Malatpure - Silicon Graphics (SGI)");
+MODULE_DESCRIPTION("PCI driver module for SGI IOC4 Base-IO Card");
+MODULE_LICENSE("GPL");
+
+EXPORT_NO_SYMBOLS;
diff -Nru a/drivers/ide/pci/sgiioc4.h b/drivers/ide/pci/sgiioc4.h
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ b/drivers/ide/pci/sgiioc4.h	Tue Jul 15 15:16:50 2003
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2003 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/NoticeExplan
+ */
+
+#ifndef SGIIOC4_H
+#define SGIIOC4_H
+
+#define IDE_ARCH_ACK_INTR	1
+#include <linux/ide.h>
+
+/* IOC4 Specific Definitions */
+#define IOC4_CMD_OFFSET		0x100
+#define IOC4_CTRL_OFFSET	0x120
+#define IOC4_DMA_OFFSET		0x140
+#define IOC4_INTR_OFFSET	0x0
+
+#define IOC4_TIMING		0x00
+#define IOC4_DMA_PTR_L		0x01
+#define IOC4_DMA_PTR_H		0x02
+#define IOC4_DMA_ADDR_L		0x03
+#define IOC4_DMA_ADDR_H		0x04
+#define IOC4_BC_DEV		0x05
+#define IOC4_BC_MEM		0x06
+#define	IOC4_DMA_CTRL		0x07
+#define	IOC4_DMA_END_ADDR	0x08
+
+/* Bits in the IOC4 Control/Status Register */
+#define	IOC4_S_DMA_START	0x01
+#define	IOC4_S_DMA_STOP		0x02
+#define	IOC4_S_DMA_DIR		0x04
+#define	IOC4_S_DMA_ACTIVE	0x08
+#define	IOC4_S_DMA_ERROR	0x10
+#define	IOC4_ATA_MEMERR		0x02
+
+/* Read/Write Directions */
+#define	IOC4_DMA_WRITE		0x04
+#define	IOC4_DMA_READ		0x00
+
+/* Interrupt Register Offsets */
+#define IOC4_INTR_REG		0x03
+#define	IOC4_INTR_SET		0x05
+#define	IOC4_INTR_CLEAR		0x07
+
+#define IOC4_IDE_CACHELINE_SIZE	128
+
+/* Weeds out non-IDE interrupts to the IOC4 */
+#define ide_ack_intr(hwif)      ((hwif)->hw.ack_intr ? (hwif)->hw.ack_intr(hwif) : 1)
+
+#define SGIIOC4_MAX_DEVS	32
+
+#if  defined(CONFIG_PROC_FS)
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+
+static u8 sgiioc4_proc;
+
+static struct pci_dev *sgiioc4_devs[SGIIOC4_MAX_DEVS];
+static int sgiioc4_get_info(char *, char **, off_t, int);
+
+static ide_pci_host_proc_t sgiioc4_procs[] __initdata = {
+	{
+	 .name = "sgiioc4",
+	 .set = 1,
+	 .get_info = sgiioc4_get_info,
+	 .parent = NULL,
+	 },
+};
+
+#endif
+
+typedef volatile struct {
+	unsigned int timing_reg0;
+	unsigned int timing_reg1;
+	unsigned int low_mem_ptr;
+	unsigned int high_mem_ptr;
+	unsigned int low_mem_addr;
+	unsigned int high_mem_addr;
+	unsigned int dev_byte_count;
+	unsigned int mem_byte_count;
+	unsigned int status;
+} ioc4_dma_regs_t;
+
+/* Each Physical Region Descriptor Entry size is 16 bytes (2 * 64 bits) */
+/* IOC4 has only 1 IDE channel */
+#define IOC4_PRD_BYTES       16
+#define IOC4_PRD_ENTRIES     (PAGE_SIZE /IOC4_PRD_BYTES)
+
+typedef enum pciio_endian_e {
+	PCIDMA_ENDIAN_BIG,
+	PCIDMA_ENDIAN_LITTLE
+} pciio_endian_t;
+
+void sgiioc4_init_hwif_ports(hw_regs_t * hw, ide_ioreg_t data_port,
+			     ide_ioreg_t ctrl_port, ide_ioreg_t irq_port);
+void sgiioc4_stopdma(ide_drive_t * drive);
+void sgiioc4_ide_setup_pci_device(struct pci_dev *dev, const char *name);
+void sgiioc4_tuneproc(ide_drive_t * drive);
+void sgiioc4_resetproc(ide_drive_t * drive);
+void sgiioc4_maskproc(ide_drive_t * drive, int mask);
+void sgiioc4_config_drive_for_dma(ide_drive_t * drive);
+void sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive);
+void __init ide_init_sgiioc4(ide_hwif_t * hwif);
+void __init ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base);
+int sgiioc4_dma_test_irq(ide_drive_t * drive);
+static int sgiioc4_checkirq(ide_hwif_t * hwif);
+static int sgiioc4_clearirq(ide_drive_t * drive);
+static int sgiioc4_get_info(char *buffer, char **addr, off_t offset, int count);
+static int sgiioc4_ide_dma_read(ide_drive_t * drive);
+static int sgiioc4_ide_dma_write(ide_drive_t * drive);
+static int sgiioc4_ide_dma_begin(ide_drive_t * drive);
+static int sgiioc4_ide_dma_end(ide_drive_t * drive);
+static int sgiioc4_ide_dma_check(ide_drive_t * drive);
+static int sgiioc4_ide_dma_on(ide_drive_t * drive);
+static int sgiioc4_ide_dma_off(ide_drive_t * drive);
+static int sgiioc4_ide_dma_off_quietly(ide_drive_t * drive);
+static int sgiioc4_ide_dma_test_irq(ide_drive_t * drive);
+static int sgiioc4_ide_dma_host_on(ide_drive_t * drive);
+static int sgiioc4_ide_dma_host_off(ide_drive_t * drive);
+static int sgiioc4_ide_dma_count(ide_drive_t * drive);
+static int sgiioc4_ide_dma_verbose(ide_drive_t * drive);
+static int sgiioc4_ide_dma_lostirq(ide_drive_t * drive);
+static int sgiioc4_ide_dma_timeout(ide_drive_t * drive);
+static int sgiioc4_ide_build_sglist(ide_hwif_t * hwif, struct request *rq,
+				    int ddir);
+static int sgiioc4_ide_raw_build_sglist(ide_hwif_t * hwif, struct request *rq);
+
+static u8 sgiioc4_INB(unsigned long port);
+static inline void xide_delay(long ticks);
+static inline void IDE_DBG(int debuglevel, char *format, ...);
+extern int (*sgiioc4_display_info) (char *, char **, off_t, int);	/* ide-proc.c */
+unsigned int sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq,
+				     int ddir);
+unsigned int __init pci_init_sgiioc4(struct pci_dev *dev, const char *name);
+ide_startstop_t ioc4_dma_intr(ide_drive_t * drive);
+
+static ide_pci_device_t sgiioc4_chipsets[] __devinitdata = {
+	{			/* Channel 0 */
+	 .vendor = PCI_VENDOR_ID_SGI,
+	 .device = PCI_DEVICE_ID_SGI_IOC4,
+	 .name = "SGIIOC4",
+	 .init_chipset = pci_init_sgiioc4,
+	 .init_iops = NULL,
+	 .init_hwif = ide_init_sgiioc4,
+	 .init_dma = ide_dma_sgiioc4,
+	 .channels = 1,
+	 .autodma = AUTODMA,
+	 .enablebits = {{0x00, 0x00, 0x00}, {0x00, 0x00, 0x00}},
+	 .bootable = ON_BOARD,
+	 .extra = 0,
+	 }
+};
+
+#endif
diff -Nru a/include/linux/pci_ids.h b/include/linux/pci_ids.h
--- a/include/linux/pci_ids.h	Tue Jul 15 15:16:49 2003
+++ b/include/linux/pci_ids.h	Tue Jul 15 15:16:49 2003
@@ -839,6 +839,7 @@
 
 #define PCI_VENDOR_ID_SGI		0x10a9
 #define PCI_DEVICE_ID_SGI_IOC3		0x0003
+#define PCI_DEVICE_ID_SGI_IOC4		0x100a
 
 #define PCI_VENDOR_ID_ACC		0x10aa
 #define PCI_DEVICE_ID_ACC_2056		0x0000

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