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 000000000000..4651a22bf12e
--- /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);