Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 728 insertions, 0 deletions

diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
new file mode 100644
index 00000000000..4651a22bf12
--- /dev/null
+++ b/drivers/ide/pci/sgiioc4.c
@@ -0,0 +1,728 @@
+/*
+ * 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.
+ *
+ * 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/module.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/hdreg.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/ioc4_common.h>
+#include <asm/io.h>
+
+#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
+#define IOC4_CMD_CTL_BLK_SIZE	0x20
+#define IOC4_SUPPORTED_FIRMWARE_REV 46
+
+typedef struct {
+	u32 timing_reg0;
+	u32 timing_reg1;
+	u32 low_mem_ptr;
+	u32 high_mem_ptr;
+	u32 low_mem_addr;
+	u32 high_mem_addr;
+	u32 dev_byte_count;
+	u32 mem_byte_count;
+	u32 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 /(4*IOC4_PRD_BYTES))
+
+
+static void
+sgiioc4_init_hwif_ports(hw_regs_t * hw, unsigned long data_port,
+			unsigned long ctrl_port, unsigned long irq_port)
+{
+	unsigned long reg = data_port;
+	int i;
+
+	/* Registers are word (32 bit) aligned */
+	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
+		hw->io_ports[i] = reg + i * 4;
+
+	if (ctrl_port)
+		hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
+
+	if (irq_port)
+		hw->io_ports[IDE_IRQ_OFFSET] = irq_port;
+}
+
+static void
+sgiioc4_maskproc(ide_drive_t * drive, int mask)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	hwif->OUTB(mask ? (drive->ctl | 2) : (drive->ctl & ~2),
+		   IDE_CONTROL_REG);
+}
+
+
+static int
+sgiioc4_checkirq(ide_hwif_t * hwif)
+{
+	u8 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);
+	unsigned long 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 */
+		/*
+		 * Using hwif->INB to read the IDE_STATUS_REG has a side effect
+		 * of clearing the interrupt.  The first read should clear it
+		 * if it is set.  The second read should return a "clear" status
+		 * if it got cleared.  If not, then spin for a bit trying to
+		 * clear it.
+		 */
+		u8 stat = hwif->INB(IDE_STATUS_REG);
+		int count = 0;
+		stat = hwif->INB(IDE_STATUS_REG);
+		while ((stat & 0x80) && (count++ < 100)) {
+			udelay(1);
+			stat = hwif->INB(IDE_STATUS_REG);
+		}
+
+		if (intr_reg & 0x02) {
+			/* Error when transferring DMA data on PCI bus */
+			u32 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);
+			printk(KERN_ERR
+			       "%s(%s) : PCI Bus Error when doing DMA:"
+				   " status-cmd reg is 0x%x\n",
+			       __FUNCTION__, drive->name, pci_stat_cmd_reg);
+			printk(KERN_ERR
+			       "%s(%s) : PCI Error Address is 0x%x%x\n",
+			       __FUNCTION__, 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);
+		}
+
+		/* Clear the Interrupt, Error bits on the IOC4 */
+		hwif->OUTL(0x03, other_ir);
+
+		intr_reg = hwif->INL(other_ir);
+	}
+
+	return intr_reg & 3;
+}
+
+static void sgiioc4_ide_dma_start(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);
+}
+
+static u32
+sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
+{
+	u32	ioc4_dma;
+	int	count;
+
+	count = 0;
+	ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+	while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
+		udelay(1);
+		ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+	}
+	return ioc4_dma;
+}
+
+/* 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);
+	u64 dma_base = hwif->dma_base;
+	int dma_stat = 0;
+	unsigned long *ending_dma = (unsigned long *) hwif->dma_base2;
+
+	hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+
+	ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
+
+	if (ioc4_dma & IOC4_S_DMA_STOP) {
+		printk(KERN_ERR
+		       "%s(%s): IOC4 DMA STOP bit is still 1 :"
+		       "ioc4_dma_reg 0x%x\n",
+		       __FUNCTION__, drive->name, ioc4_dma);
+		dma_stat = 1;
+	}
+
+	/*
+	 * The IOC4 will DMA 1's to the ending dma area to indicate that
+	 * previous data DMA is complete.  This is necessary because of relaxed
+	 * ordering between register reads and DMA writes on the Altix.
+	 */
+	while ((cnt++ < 200) && (!valid)) {
+		for (num = 0; num < 16; num++) {
+			if (ending_dma[num]) {
+				valid = 1;
+				break;
+			}
+		}
+		udelay(1);
+	}
+	if (!valid) {
+		printk(KERN_ERR "%s(%s) : DMA incomplete\n", __FUNCTION__,
+		       drive->name);
+		dma_stat = 1;
+	}
+
+	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) {
+			printk(KERN_ERR
+			       "%s(%s): WARNING!! byte_count_dev %d "
+			       "!= byte_count_mem %d\n",
+			       __FUNCTION__, 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)
+{
+	if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) {
+		printk(KERN_INFO
+		       "Couldnot set %s in Multimode-2 DMA mode | "
+			   "Drive %s using PIO instead\n",
+		       drive->name, drive->name);
+		drive->using_dma = 0;
+	} else
+		drive->using_dma = 1;
+
+	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_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_lostirq(ide_drive_t * drive)
+{
+	HWIF(drive)->resetproc(drive);
+
+	return __ide_dma_lostirq(drive);
+}
+
+static void
+sgiioc4_resetproc(ide_drive_t * drive)
+{
+	sgiioc4_ide_dma_end(drive);
+	sgiioc4_clearirq(drive);
+}
+
+static u8
+sgiioc4_INB(unsigned long port)
+{
+	u8 reg = (u8) inb(port);
+
+	if ((port & 0xFFF) == 0x11C) {	/* Status register of IOC4 */
+		if (reg & 0x51) {	/* Not busy...check for interrupt */
+			unsigned long other_ir = port - 0x110;
+			unsigned int intr_reg = (u32) inl(other_ir);
+
+			/* Clear the Interrupt, Error bits on the IOC4 */
+			if (intr_reg & 0x03) {
+				outl(0x03, other_ir);
+				intr_reg = (u32) inl(other_ir);
+			}
+		}
+	}
+
+	return reg;
+}
+
+/* Creates a dma map for the scatter-gather list entries */
+static void __devinit
+ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base)
+{
+	int num_ports = sizeof (ioc4_dma_regs_t);
+
+	printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
+	       dma_base, dma_base + num_ports - 1);
+
+	if (!request_region(dma_base, num_ports, hwif->name)) {
+		printk(KERN_ERR
+		       "%s(%s) -- ERROR, Addresses 0x%p to 0x%p "
+		       "ALREADY in use\n",
+		       __FUNCTION__, hwif->name, (void *) dma_base,
+		       (void *) dma_base + num_ports - 1);
+		goto dma_alloc_failure;
+	}
+
+	hwif->dma_base = dma_base;
+	hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
+					  IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
+					  &hwif->dmatable_dma);
+
+	if (!hwif->dmatable_cpu)
+		goto dma_alloc_failure;
+
+	hwif->sg_max_nents = IOC4_PRD_ENTRIES;
+
+	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)
+		goto dma_base2alloc_failure;
+
+	return;
+
+dma_base2alloc_failure:
+	pci_free_consistent(hwif->pci_dev,
+			    IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
+			    hwif->dmatable_cpu, hwif->dmatable_dma);
+	printk(KERN_INFO
+	       "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
+	       __FUNCTION__, hwif->name);
+	printk(KERN_INFO
+	       "Changing from DMA to PIO mode for Drive %s\n", hwif->name);
+
+dma_alloc_failure:
+	/* Disable DMA because we couldnot allocate any DMA maps */
+	hwif->autodma = 0;
+	hwif->atapi_dma = 0;
+}
+
+/* Initializes the IOC4 DMA Engine */
+static void
+sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
+{
+	u32 ioc4_dma;
+	ide_hwif_t *hwif = HWIF(drive);
+	u64 dma_base = hwif->dma_base;
+	u32 dma_addr, ending_dma_addr;
+
+	ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+
+	if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
+		printk(KERN_WARNING
+			"%s(%s):Warning!! DMA from previous transfer was still active\n",
+		       __FUNCTION__, drive->name);
+		hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+		ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
+
+		if (ioc4_dma & IOC4_S_DMA_STOP)
+			printk(KERN_ERR
+			       "%s(%s) : IOC4 Dma STOP bit is still 1\n",
+			       __FUNCTION__, drive->name);
+	}
+
+	ioc4_dma = hwif->INL(dma_base + IOC4_DMA_CTRL * 4);
+	if (ioc4_dma & IOC4_S_DMA_ERROR) {
+		printk(KERN_WARNING
+		       "%s(%s) : Warning!! - DMA Error during Previous"
+		       " transfer | status 0x%x\n",
+		       __FUNCTION__, drive->name, ioc4_dma);
+		hwif->OUTL(IOC4_S_DMA_STOP, dma_base + IOC4_DMA_CTRL * 4);
+		ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);
+
+		if (ioc4_dma & IOC4_S_DMA_STOP)
+			printk(KERN_ERR
+			       "%s(%s) : IOC4 DMA STOP bit is still 1\n",
+			       __FUNCTION__, drive->name);
+	}
+
+	/* 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 */
+	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;
+}
+
+/* IOC4 Scatter Gather list Format 					 */
+/* 128 Bit entries to support 64 bit addresses in the future		 */
+/* The Scatter Gather list Entry should be in the BIG-ENDIAN Format	 */
+/* --------------------------------------------------------------------- */
+/* | Upper 32 bits - Zero           |	 	Lower 32 bits- address | */
+/* --------------------------------------------------------------------- */
+/* | Upper 32 bits - Zero	    |EOL| 15 unused     | 16 Bit Length| */
+/* --------------------------------------------------------------------- */
+/* Creates the scatter gather list, DMA Table */
+static 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;
+
+	hwif->sg_nents = i = ide_build_sglist(drive, rq);
+
+	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(KERN_WARNING
+				       "%s: DMA table too small\n",
+				       drive->name);
+				goto use_pio_instead;
+			} else {
+				u32 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);
+
+	return 0;		/* revert to PIO for this request */
+}
+
+static int sgiioc4_ide_dma_setup(ide_drive_t *drive)
+{
+	struct request *rq = HWGROUP(drive)->rq;
+	unsigned int count = 0;
+	int ddir;
+
+	if (rq_data_dir(rq))
+		ddir = PCI_DMA_TODEVICE;
+	else
+		ddir = PCI_DMA_FROMDEVICE;
+
+	if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
+		/* try PIO instead of DMA */
+		ide_map_sg(drive, rq);
+		return 1;
+	}
+
+	if (rq_data_dir(rq))
+		/* Writes TO the IOC4 FROM Main Memory */
+		ddir = IOC4_DMA_READ;
+	else
+		/* Writes FROM the IOC4 TO Main Memory */
+		ddir = IOC4_DMA_WRITE;
+
+	sgiioc4_configure_for_dma(ddir, drive);
+
+	return 0;
+}
+
+static void __devinit
+ide_init_sgiioc4(ide_hwif_t * hwif)
+{
+	hwif->mmio = 2;
+	hwif->autodma = 1;
+	hwif->atapi_dma = 1;
+	hwif->ultra_mask = 0x0;	/* Disable Ultra DMA */
+	hwif->mwdma_mask = 0x2;	/* Multimode-2 DMA  */
+	hwif->swdma_mask = 0x2;
+	hwif->tuneproc = NULL;	/* Sets timing for PIO mode */
+	hwif->speedproc = NULL;	/* Sets timing for DMA &/or PIO modes */
+	hwif->selectproc = NULL;/* Use the default 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 DMA engine,
+						clear interrupts */
+	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->dma_setup = &sgiioc4_ide_dma_setup;
+	hwif->dma_start = &sgiioc4_ide_dma_start;
+	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_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_lostirq = &sgiioc4_ide_dma_lostirq;
+	hwif->ide_dma_timeout = &__ide_dma_timeout;
+	hwif->INB = &sgiioc4_INB;
+}
+
+static int __devinit
+sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
+{
+	unsigned long base, ctl, dma_base, irqport;
+	ide_hwif_t *hwif;
+	int h;
+
+	for (h = 0; h < MAX_HWIFS; ++h) {
+		hwif = &ide_hwifs[h];
+		/* Find an empty HWIF */
+		if (hwif->chipset == ide_unknown)
+			break;
+	}
+
+	/*  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;
+
+	if (!request_region(base, IOC4_CMD_CTL_BLK_SIZE, hwif->name)) {
+		printk(KERN_ERR
+			"%s : %s -- ERROR, Port Addresses "
+			"0x%p to 0x%p ALREADY in use\n",
+		       __FUNCTION__, hwif->name, (void *) base,
+		       (void *) base + IOC4_CMD_CTL_BLK_SIZE);
+		return -ENOMEM;
+	}
+
+	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->irq = dev->irq;
+	hwif->chipset = ide_pci;
+	hwif->pci_dev = dev;
+	hwif->channel = 0;	/* Single Channel chip */
+	hwif->cds = (struct ide_pci_device_s *) d;
+	hwif->gendev.parent = &dev->dev;/* setup proper ancestral information */
+
+	/* Initializing chipset IRQ Registers */
+	hwif->OUTL(0x03, irqport + IOC4_INTR_SET * 4);
+
+	ide_init_sgiioc4(hwif);
+
+	if (dma_base)
+		ide_dma_sgiioc4(hwif, dma_base);
+	else
+		printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
+		       hwif->name, d->name);
+
+	if (probe_hwif_init(hwif))
+		return -EIO;
+
+	/* Create /proc/ide entries */
+	create_proc_ide_interfaces(); 
+
+	return 0;
+}
+
+static unsigned int __devinit
+pci_init_sgiioc4(struct pci_dev *dev, ide_pci_device_t * d)
+{
+	unsigned int class_rev;
+	int ret;
+
+	pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
+	class_rev &= 0xff;
+	printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
+			d->name, pci_name(dev), class_rev);
+	if (class_rev < IOC4_SUPPORTED_FIRMWARE_REV) {
+		printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
+			"firmware is obsolete - please upgrade to revision"
+			"46 or higher\n", d->name, pci_name(dev));
+		ret = -EAGAIN;
+		goto out;
+	}
+	ret = sgiioc4_ide_setup_pci_device(dev, d);
+out:
+	return ret;
+}
+
+static ide_pci_device_t sgiioc4_chipsets[] __devinitdata = {
+	{
+	 /* Channel 0 */
+	 .name = "SGIIOC4",
+	 .init_hwif = ide_init_sgiioc4,
+	 .init_dma = ide_dma_sgiioc4,
+	 .channels = 1,
+	 .autodma = AUTODMA,
+	 /* SGI IOC4 doesn't have enablebits. */
+	 .bootable = ON_BOARD,
+	}
+};
+
+int
+ioc4_ide_attach_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	return pci_init_sgiioc4(dev, &sgiioc4_chipsets[id->driver_data]);
+}
+
+
+MODULE_AUTHOR("Aniket Malatpure - Silicon Graphics Inc. (SGI)");
+MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(ioc4_ide_attach_one);