initial commit with v2.6.9

[linux-2.6.9-moxart.git] / drivers / ide / setup-pci.c

/*
 *  linux/drivers/ide/setup-pci.c               Version 1.10    2002/08/19
 *
 *  Copyright (c) 1998-2000  Andre Hedrick <andre@linux-ide.org>
 *
 *  Copyright (c) 1995-1998  Mark Lord
 *  May be copied or modified under the terms of the GNU General Public License
 *
 *  Recent Changes
 *      Split the set up function into multiple functions
 *      Use pci_set_master
 *      Fix misreporting of I/O v MMIO problems
 *      Initial fixups for simplex devices
 */

/*
 *  This module provides support for automatic detection and
 *  configuration of all PCI IDE interfaces present in a system.  
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/ide.h>

#include <asm/io.h>
#include <asm/irq.h>


/**
 *      ide_match_hwif  -       match a PCI IDE against an ide_hwif
 *      @io_base: I/O base of device
 *      @bootable: set if its bootable
 *      @name: name of device
 *
 *      Match a PCI IDE port against an entry in ide_hwifs[],
 *      based on io_base port if possible. Return the matching hwif,
 *      or a new hwif. If we find an error (clashing, out of devices, etc)
 *      return NULL
 *
 *      FIXME: we need to handle mmio matches here too
 */

static ide_hwif_t *ide_match_hwif(unsigned long io_base, u8 bootable, const char *name)
{
        int h;
        ide_hwif_t *hwif;

        /*
         * Look for a hwif with matching io_base specified using
         * parameters to ide_setup().
         */
        for (h = 0; h < MAX_HWIFS; ++h) {
                hwif = &ide_hwifs[h];
                if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
                        if (hwif->chipset == ide_forced)
                                return hwif; /* a perfect match */
                }
        }
        /*
         * Look for a hwif with matching io_base default value.
         * If chipset is "ide_unknown", then claim that hwif slot.
         * Otherwise, some other chipset has already claimed it..  :(
         */
        for (h = 0; h < MAX_HWIFS; ++h) {
                hwif = &ide_hwifs[h];
                if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
                        if (hwif->chipset == ide_unknown)
                                return hwif; /* match */
                        printk(KERN_ERR "%s: port 0x%04lx already claimed by %s\n",
                                name, io_base, hwif->name);
                        return NULL;    /* already claimed */
                }
        }
        /*
         * Okay, there is no hwif matching our io_base,
         * so we'll just claim an unassigned slot.
         * Give preference to claiming other slots before claiming ide0/ide1,
         * just in case there's another interface yet-to-be-scanned
         * which uses ports 1f0/170 (the ide0/ide1 defaults).
         *
         * Unless there is a bootable card that does not use the standard
         * ports 1f0/170 (the ide0/ide1 defaults). The (bootable) flag.
         */
        if (bootable) {
                for (h = 0; h < MAX_HWIFS; ++h) {
                        hwif = &ide_hwifs[h];
                        if (hwif->chipset == ide_unknown)
                                return hwif;    /* pick an unused entry */
                }
        } else {
                for (h = 2; h < MAX_HWIFS; ++h) {
                        hwif = ide_hwifs + h;
                        if (hwif->chipset == ide_unknown)
                                return hwif;    /* pick an unused entry */
                }
        }
        for (h = 0; h < 2; ++h) {
                hwif = ide_hwifs + h;
                if (hwif->chipset == ide_unknown)
                        return hwif;    /* pick an unused entry */
        }
        printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", name);
        return NULL;
}

/**
 *      ide_setup_pci_baseregs  -       place a PCI IDE controller native
 *      @dev: PCI device of interface to switch native
 *      @name: Name of interface
 *
 *      We attempt to place the PCI interface into PCI native mode. If
 *      we succeed the BARs are ok and the controller is in PCI mode.
 *      Returns 0 on success or an errno code. 
 *
 *      FIXME: if we program the interface and then fail to set the BARS
 *      we don't switch it back to legacy mode. Do we actually care ??
 */
 
static int ide_setup_pci_baseregs (struct pci_dev *dev, const char *name)
{
        u8 progif = 0;

        /*
         * Place both IDE interfaces into PCI "native" mode:
         */
        if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
                         (progif & 5) != 5) {
                if ((progif & 0xa) != 0xa) {
                        printk(KERN_INFO "%s: device not capable of full "
                                "native PCI mode\n", name);
                        return -EOPNOTSUPP;
                }
                printk("%s: placing both ports into native PCI mode\n", name);
                (void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
                if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
                    (progif & 5) != 5) {
                        printk(KERN_ERR "%s: rewrite of PROGIF failed, wanted "
                                "0x%04x, got 0x%04x\n",
                                name, progif|5, progif);
                        return -EOPNOTSUPP;
                }
        }
        return 0;
}

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI

#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
/*
 * Long lost data from 2.0.34 that is now in 2.0.39
 *
 * This was used in ./drivers/block/triton.c to do DMA Base address setup
 * when PnP failed.  Oh the things we forget.  I believe this was part
 * of SFF-8038i that has been withdrawn from public access... :-((
 */
#define DEFAULT_BMIBA   0xe800  /* in case BIOS did not init it */
#define DEFAULT_BMCRBA  0xcc00  /* VIA's default value */
#define DEFAULT_BMALIBA 0xd400  /* ALI's default value */
#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */

/**
 *      ide_get_or_set_dma_base         -       setup BMIBA
 *      @hwif: Interface
 *
 *      Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space:
 *      If need be we set up the DMA base. Where a device has a partner that
 *      is already in DMA mode we check and enforce IDE simplex rules.
 */

static unsigned long ide_get_or_set_dma_base (ide_hwif_t *hwif)
{
        unsigned long   dma_base = 0;
        struct pci_dev  *dev = hwif->pci_dev;

#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
        int second_chance = 0;

second_chance_to_dma:
#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */

        if ((hwif->mmio) && (hwif->dma_base))
                return hwif->dma_base;

        if (hwif->mate && hwif->mate->dma_base) {
                dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
        } else {
                dma_base = (hwif->mmio) ?
                        ((unsigned long) hwif->hwif_data) :
                        (pci_resource_start(dev, 4));
                if (!dma_base) {
                        printk(KERN_ERR "%s: dma_base is invalid (0x%04lx)\n",
                                hwif->cds->name, dma_base);
                        dma_base = 0;
                }
        }

#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
        /* FIXME - should use pci_assign_resource surely */
        if ((!dma_base) && (!second_chance)) {
                unsigned long set_bmiba = 0;
                second_chance++;
                switch(dev->vendor) {
                        case PCI_VENDOR_ID_AL:
                                set_bmiba = DEFAULT_BMALIBA; break;
                        case PCI_VENDOR_ID_VIA:
                                set_bmiba = DEFAULT_BMCRBA; break;
                        case PCI_VENDOR_ID_INTEL:
                                set_bmiba = DEFAULT_BMIBA; break;
                        default:
                                return dma_base;
                }
                pci_write_config_dword(dev, 0x20, set_bmiba|1);
                goto second_chance_to_dma;
        }
#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */

        if (dma_base) {
                u8 simplex_stat = 0;
                dma_base += hwif->channel ? 8 : 0;

                switch(dev->device) {
                        case PCI_DEVICE_ID_AL_M5219:
                        case PCI_DEVICE_ID_AL_M5229:
                        case PCI_DEVICE_ID_AMD_VIPER_7409:
                        case PCI_DEVICE_ID_CMD_643:
                        case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
                                simplex_stat = hwif->INB(dma_base + 2);
                                hwif->OUTB((simplex_stat&0x60),(dma_base + 2));
                                simplex_stat = hwif->INB(dma_base + 2);
                                if (simplex_stat & 0x80) {
                                        printk(KERN_INFO "%s: simplex device: "
                                                "DMA forced\n",
                                                hwif->cds->name);
                                }
                                break;
                        default:
                                /*
                                 * If the device claims "simplex" DMA,
                                 * this means only one of the two interfaces
                                 * can be trusted with DMA at any point in time.
                                 * So we should enable DMA only on one of the
                                 * two interfaces.
                                 */
                                simplex_stat = hwif->INB(dma_base + 2);
                                if (simplex_stat & 0x80) {
                                        /* simplex device? */
#if 0                                   
/*
 *      At this point we haven't probed the drives so we can't make the
 *      appropriate decision. Really we should defer this problem
 *      until we tune the drive then try to grab DMA ownership if we want
 *      to be the DMA end. This has to be become dynamic to handle hot
 *      plug.
 */
                                        /* Don't enable DMA on a simplex channel with no drives */
                                        if (!hwif->drives[0].present && !hwif->drives[1].present)
                                        {
                                                printk(KERN_INFO "%s: simplex device with no drives: DMA disabled\n",
                                                                hwif->cds->name);
                                                dma_base = 0;
                                        }
                                        /* If our other channel has DMA then we cannot */
                                        else 
#endif                                  
                                        if(hwif->mate && hwif->mate->dma_base) 
                                        {
                                                printk(KERN_INFO "%s: simplex device: "
                                                        "DMA disabled\n",
                                                        hwif->cds->name);
                                                dma_base = 0;
                                        }
                                }
                }
        }
        return dma_base;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */

void ide_setup_pci_noise (struct pci_dev *dev, ide_pci_device_t *d)
{
        printk(KERN_INFO "%s: IDE controller at PCI slot %s\n",
                         d->name, pci_name(dev));
}

EXPORT_SYMBOL_GPL(ide_setup_pci_noise);


/**
 *      ide_pci_enable  -       do PCI enables
 *      @dev: PCI device
 *      @d: IDE pci device data
 *
 *      Enable the IDE PCI device. We attempt to enable the device in full
 *      but if that fails then we only need BAR4 so we will enable that.
 *      
 *      Returns zero on success or an error code
 */
 
static int ide_pci_enable(struct pci_dev *dev, ide_pci_device_t *d)
{
        
        if (pci_enable_device(dev)) {
                if (pci_enable_device_bars(dev, 1 << 4)) {
                        printk(KERN_WARNING "%s: (ide_setup_pci_device:) "
                                "Could not enable device.\n", d->name);
                        return -EBUSY;
                } else
                        printk(KERN_WARNING "%s: BIOS configuration fixed.\n", d->name);
        }

        /*
         * assume all devices can do 32-bit dma for now. we can add a
         * dma mask field to the ide_pci_device_t if we need it (or let
         * lower level driver set the dma mask)
         */
        if (pci_set_dma_mask(dev, 0xffffffff)) {
                printk(KERN_ERR "%s: can't set dma mask\n", d->name);
                return -EBUSY;
        }
         
        /* FIXME: Temporary - until we put in the hotplug interface logic
           Check that the bits we want are not in use by someone else */
        if (pci_request_region(dev, 4, "ide_tmp"))
                return -EBUSY;
        pci_release_region(dev, 4);
        
        return 0;       
}

/**
 *      ide_pci_configure       -       configure an unconfigured device
 *      @dev: PCI device
 *      @d: IDE pci device data
 *
 *      Enable and configure the PCI device we have been passed.
 *      Returns zero on success or an error code.
 */
 
static int ide_pci_configure(struct pci_dev *dev, ide_pci_device_t *d)
{
        u16 pcicmd = 0;
        /*
         * PnP BIOS was *supposed* to have setup this device, but we
         * can do it ourselves, so long as the BIOS has assigned an IRQ
         * (or possibly the device is using a "legacy header" for IRQs).
         * Maybe the user deliberately *disabled* the device,
         * but we'll eventually ignore it again if no drives respond.
         */
        if (ide_setup_pci_baseregs(dev, d->name) || pci_write_config_word(dev, PCI_COMMAND, pcicmd|PCI_COMMAND_IO)) 
        {
                printk(KERN_INFO "%s: device disabled (BIOS)\n", d->name);
                return -ENODEV;
        }
        if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
                printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
                return -EIO;
        }
        if (!(pcicmd & PCI_COMMAND_IO)) {
                printk(KERN_ERR "%s: unable to enable IDE controller\n", d->name);
                return -ENXIO;
        }
        return 0;
}

/**
 *      ide_pci_check_iomem     -       check a register is I/O
 *      @dev: pci device
 *      @d: ide_pci_device
 *      @bar: bar number
 *
 *      Checks if a BAR is configured and points to MMIO space. If so
 *      print an error and return an error code. Otherwise return 0
 */
 
static int ide_pci_check_iomem(struct pci_dev *dev, ide_pci_device_t *d, int bar)
{
        ulong flags = pci_resource_flags(dev, bar);
        
        /* Unconfigured ? */
        if (!flags || pci_resource_len(dev, bar) == 0)
                return 0;

        /* I/O space */         
        if(flags & PCI_BASE_ADDRESS_IO_MASK)
                return 0;
                
        /* Bad */
        printk(KERN_ERR "%s: IO baseregs (BIOS) are reported "
                        "as MEM, report to "
                        "<andre@linux-ide.org>.\n", d->name);
        return -EINVAL;
}

/**
 *      ide_hwif_configure      -       configure an IDE interface
 *      @dev: PCI device holding interface
 *      @d: IDE pci data
 *      @mate: Paired interface if any
 *
 *      Perform the initial set up for the hardware interface structure. This
 *      is done per interface port rather than per PCI device. There may be
 *      more than one port per device.
 *
 *      Returns the new hardware interface structure, or NULL on a failure
 */
 
static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *mate, int port, int irq)
{
        unsigned long ctl = 0, base = 0;
        ide_hwif_t *hwif;

        if ((d->flags & IDEPCI_FLAG_ISA_PORTS) == 0) {
                /*  Possibly we should fail if these checks report true */
                ide_pci_check_iomem(dev, d, 2*port);
                ide_pci_check_iomem(dev, d, 2*port+1);
 
                ctl  = pci_resource_start(dev, 2*port+1);
                base = pci_resource_start(dev, 2*port);
                if ((ctl && !base) || (base && !ctl)) {
                        printk(KERN_ERR "%s: inconsistent baseregs (BIOS) "
                                "for port %d, skipping\n", d->name, port);
                        return NULL;
                }
        }
        if (!ctl)
        {
                /* Use default values */
                ctl = port ? 0x374 : 0x3f4;
                base = port ? 0x170 : 0x1f0;
        }
        if ((hwif = ide_match_hwif(base, d->bootable, d->name)) == NULL)
                return NULL;    /* no room in ide_hwifs[] */
        if (hwif->io_ports[IDE_DATA_OFFSET] != base ||
            hwif->io_ports[IDE_CONTROL_OFFSET] != (ctl | 2)) {
                memset(&hwif->hw, 0, sizeof(hwif->hw));
                ide_init_hwif_ports(&hwif->hw, base, (ctl | 2), NULL);
                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->cds = (struct ide_pci_device_s *) d;
        hwif->channel = port;

        if (!hwif->irq)
                hwif->irq = irq;
        if (mate) {
                hwif->mate = mate;
                mate->mate = hwif;
        }
        return hwif;
}

/**
 *      ide_hwif_setup_dma      -       configure DMA interface
 *      @dev: PCI device
 *      @d: IDE pci data
 *      @hwif: Hardware interface we are configuring
 *
 *      Set up the DMA base for the interface. Enable the master bits as
 *      necessary and attempt to bring the device DMA into a ready to use
 *      state
 */
 
#ifndef CONFIG_BLK_DEV_IDEDMA_PCI
static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
{
}
#else
static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
{
        u16 pcicmd;
        pci_read_config_word(dev, PCI_COMMAND, &pcicmd);

        if ((d->autodma == AUTODMA) ||
            ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
             (dev->class & 0x80))) {
                unsigned long dma_base = ide_get_or_set_dma_base(hwif);
                if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
                        /*
                         * Set up BM-DMA capability
                         * (PnP BIOS should have done this)
                         */
                        if ((d->flags & IDEPCI_FLAG_FORCE_MASTER) == 0) {
                                /*
                                 * default DMA off if we had to
                                 * configure it here
                                 */
                                hwif->autodma = 0;
                        }
                        pci_set_master(dev);
                        if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
                                printk(KERN_ERR "%s: %s error updating PCICMD\n",
                                        hwif->name, d->name);
                                dma_base = 0;
                        }
                }
                if (dma_base) {
                        if (d->init_dma) {
                                d->init_dma(hwif, dma_base);
                        } else {
                                ide_setup_dma(hwif, dma_base, 8);
                        }
                } else {
                        printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
                                "(BIOS)\n", hwif->name, d->name);
                }
        }
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI*/

/**
 *      ide_setup_pci_controller        -       set up IDE PCI
 *      @dev: PCI device
 *      @d: IDE PCI data
 *      @noisy: verbose flag
 *      @config: returned as 1 if we configured the hardware
 *
 *      Set up the PCI and controller side of the IDE interface. This brings
 *      up the PCI side of the device, checks that the device is enabled
 *      and enables it if need be
 */
 
static int ide_setup_pci_controller(struct pci_dev *dev, ide_pci_device_t *d, int noisy, int *config)
{
        int ret = 0;
        u32 class_rev;
        u16 pcicmd;

        if (!noautodma)
                ret = 1;

        if (noisy)
                ide_setup_pci_noise(dev, d);

        if (ide_pci_enable(dev, d))
                return -EBUSY;
                
        if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
                printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
                return -EIO;
        }
        if (!(pcicmd & PCI_COMMAND_IO)) {       /* is device disabled? */
                if (ide_pci_configure(dev, d))
                        return -ENODEV;
                /* default DMA off if we had to configure it here */
                ret = 0;
                *config = 1;
                printk(KERN_INFO "%s: device enabled (Linux)\n", d->name);
        }

        pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
        class_rev &= 0xff;
        if (noisy)
                printk(KERN_INFO "%s: chipset revision %d\n", d->name, class_rev);
        return ret;
}

/**
 *      ide_pci_setup_ports     -       configure ports/devices on PCI IDE
 *      @dev: PCI device
 *      @d: IDE pci device info
 *      @autodma: Should we enable DMA
 *      @pciirq: IRQ line
 *      @index: ata index to update
 *
 *      Scan the interfaces attached to this device and do any
 *      necessary per port setup. Attach the devices and ask the
 *      generic DMA layer to do its work for us.
 *
 *      Normally called automaticall from do_ide_pci_setup_device,
 *      but is also used directly as a helper function by some controllers
 *      where the chipset setup is not the default PCI IDE one.
 */
 
void ide_pci_setup_ports(struct pci_dev *dev, ide_pci_device_t *d, int autodma, int pciirq, ata_index_t *index)
{
        int port;
        int at_least_one_hwif_enabled = 0;
        ide_hwif_t *hwif, *mate = NULL;
        static int secondpdc = 0;
        u8 tmp;

        index->all = 0xf0f0;

        /*
         * Set up the IDE ports
         */
         
        for (port = 0; port <= 1; ++port) {
                ide_pci_enablebit_t *e = &(d->enablebits[port]);
        
                /* 
                 * If this is a Promise FakeRaid controller,
                 * the 2nd controller will be marked as 
                 * disabled while it is actually there and enabled
                 * by the bios for raid purposes. 
                 * Skip the normal "is it enabled" test for those.
                 */
                if ((d->flags & IDEPCI_FLAG_FORCE_PDC) &&
                    (secondpdc++==1) && (port==1))
                        goto controller_ok;
                        
                if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
                    (tmp & e->mask) != e->val))
                        continue;       /* port not enabled */
controller_ok:

                if (d->channels <= port)
                        break;
        
                if ((hwif = ide_hwif_configure(dev, d, mate, port, pciirq)) == NULL)
                        continue;

                /* setup proper ancestral information */
                hwif->gendev.parent = &dev->dev;

                if (hwif->channel) {
                        index->b.high = hwif->index;
                } else {
                        index->b.low = hwif->index;
                }

                
                if (d->init_iops)
                        d->init_iops(hwif);

                if (d->autodma == NODMA)
                        goto bypass_legacy_dma;
                if (d->autodma == NOAUTODMA)
                        autodma = 0;
                if (autodma)
                        hwif->autodma = 1;
                        
                if(d->init_setup_dma)
                        d->init_setup_dma(dev, d, hwif);
                else
                        ide_hwif_setup_dma(dev, d, hwif);
bypass_legacy_dma:
                if (d->init_hwif)
                        /* Call chipset-specific routine
                         * for each enabled hwif
                         */
                        d->init_hwif(hwif);

                mate = hwif;
                at_least_one_hwif_enabled = 1;
        }
        if (!at_least_one_hwif_enabled)
                printk(KERN_INFO "%s: neither IDE port enabled (BIOS)\n", d->name);
}

EXPORT_SYMBOL_GPL(ide_pci_setup_ports);

/*
 * ide_setup_pci_device() looks at the primary/secondary interfaces
 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
 * for use with them.  This generic code works for most PCI chipsets.
 *
 * One thing that is not standardized is the location of the
 * primary/secondary interface "enable/disable" bits.  For chipsets that
 * we "know" about, this information is in the ide_pci_device_t struct;
 * for all other chipsets, we just assume both interfaces are enabled.
 */
static ata_index_t do_ide_setup_pci_device (struct pci_dev *dev, ide_pci_device_t *d, u8 noisy)
{
        int autodma = 0;
        int pciirq = 0;
        int tried_config = 0;
        ata_index_t index = { .b = { .low = 0xff, .high = 0xff } };

        if((autodma = ide_setup_pci_controller(dev, d, noisy, &tried_config)) < 0)
                return index;

        /*
         * Can we trust the reported IRQ?
         */
        pciirq = dev->irq;

        /* Is it an "IDE storage" device in non-PCI mode? */
        if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5) {
                if (noisy)
                        printk(KERN_INFO "%s: not 100%% native mode: "
                                "will probe irqs later\n", d->name);
                /*
                 * This allows offboard ide-pci cards the enable a BIOS,
                 * verify interrupt settings of split-mirror pci-config
                 * space, place chipset into init-mode, and/or preserve
                 * an interrupt if the card is not native ide support.
                 */
                pciirq = (d->init_chipset) ? d->init_chipset(dev, d->name) : 0;
        } else if (tried_config) {
                if (noisy)
                        printk(KERN_INFO "%s: will probe irqs later\n", d->name);
                pciirq = 0;
        } else if (!pciirq) {
                if (noisy)
                        printk(KERN_WARNING "%s: bad irq (%d): will probe later\n",
                                d->name, pciirq);
                pciirq = 0;
        } else {
                if (d->init_chipset)
                {
                        if(d->init_chipset(dev, d->name) < 0)
                                return index;
                }
                if (noisy)
#ifdef __sparc__
                        printk(KERN_INFO "%s: 100%% native mode on irq %s\n",
                               d->name, __irq_itoa(pciirq));
#else
                        printk(KERN_INFO "%s: 100%% native mode on irq %d\n",
                                d->name, pciirq);
#endif
        }
        
        if(pciirq < 0)          /* Error not an IRQ */
                return index;

        ide_pci_setup_ports(dev, d, autodma, pciirq, &index);

        return index;
}

void ide_setup_pci_device (struct pci_dev *dev, ide_pci_device_t *d)
{
        ata_index_t index_list = do_ide_setup_pci_device(dev, d, 1);

        if ((index_list.b.low & 0xf0) != 0xf0)
                probe_hwif_init(&ide_hwifs[index_list.b.low]);
        if ((index_list.b.high & 0xf0) != 0xf0)
                probe_hwif_init(&ide_hwifs[index_list.b.high]);

        create_proc_ide_interfaces();
}

EXPORT_SYMBOL_GPL(ide_setup_pci_device);

void ide_setup_pci_devices (struct pci_dev *dev, struct pci_dev *dev2, ide_pci_device_t *d)
{
        ata_index_t index_list  = do_ide_setup_pci_device(dev, d, 1);
        ata_index_t index_list2 = do_ide_setup_pci_device(dev2, d, 0);

        if ((index_list.b.low & 0xf0) != 0xf0)
                probe_hwif_init(&ide_hwifs[index_list.b.low]);
        if ((index_list.b.high & 0xf0) != 0xf0)
                probe_hwif_init(&ide_hwifs[index_list.b.high]);
        if ((index_list2.b.low & 0xf0) != 0xf0)
                probe_hwif_init(&ide_hwifs[index_list2.b.low]);
        if ((index_list2.b.high & 0xf0) != 0xf0)
                probe_hwif_init(&ide_hwifs[index_list2.b.high]);

        create_proc_ide_interfaces();
}

EXPORT_SYMBOL_GPL(ide_setup_pci_devices);

/*
 *      Module interfaces
 */
 
static int pre_init = 1;                /* Before first ordered IDE scan */
static LIST_HEAD(ide_pci_drivers);

/*
 *      ide_register_pci_driver         -       attach IDE driver
 *      @driver: pci driver
 *
 *      Registers a driver with the IDE layer. The IDE layer arranges that
 *      boot time setup is done in the expected device order and then 
 *      hands the controllers off to the core PCI code to do the rest of
 *      the work.
 *
 *      The driver_data of the driver table must point to an ide_pci_device_t
 *      describing the interface.
 *
 *      Returns are the same as for pci_register_driver
 */

int ide_pci_register_driver(struct pci_driver *driver)
{
        if(!pre_init)
                return pci_module_init(driver);
        list_add_tail(&driver->node, &ide_pci_drivers);
        return 0;
}

EXPORT_SYMBOL_GPL(ide_pci_register_driver);

/**
 *      ide_unregister_pci_driver       -       unregister an IDE driver
 *      @driver: driver to remove
 *
 *      Unregister a currently installed IDE driver. Returns are the same
 *      as for pci_unregister_driver
 */
 
void ide_pci_unregister_driver(struct pci_driver *driver)
{
        if(!pre_init)
                pci_unregister_driver(driver);
        else
                list_del(&driver->node);
}

EXPORT_SYMBOL_GPL(ide_pci_unregister_driver);

/**
 *      ide_scan_pcidev         -       find an IDE driver for a device
 *      @dev: PCI device to check
 *
 *      Look for an IDE driver to handle the device we are considering.
 *      This is only used during boot up to get the ordering correct. After
 *      boot up the pci layer takes over the job.
 */
 
static int __init ide_scan_pcidev(struct pci_dev *dev)
{
        struct list_head *l;
        struct pci_driver *d;
        
        list_for_each(l, &ide_pci_drivers)
        {
                d = list_entry(l, struct pci_driver, node);
                if(d->id_table)
                {
                        const struct pci_device_id *id = pci_match_device(d->id_table, dev);
                        if(id != NULL)
                        {
                                if(d->probe(dev, id) >= 0)
                                {
                                        dev->driver = d;
                                        return 1;
                                }
                        }
                }
        }
        return 0;
}

/**
 *      ide_scan_pcibus         -       perform the initial IDE driver scan
 *      @scan_direction: set for reverse order scanning
 *
 *      Perform the initial bus rather than driver ordered scan of the
 *      PCI drivers. After this all IDE pci handling becomes standard
 *      module ordering not traditionally ordered.
 */
        
void __init ide_scan_pcibus (int scan_direction)
{
        struct pci_dev *dev = NULL;
        struct pci_driver *d;
        struct list_head *l, *n;

        pre_init = 0;
        if (!scan_direction) {
                while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
                        ide_scan_pcidev(dev);
                }
        } else {
                while ((dev = pci_find_device_reverse(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
                        ide_scan_pcidev(dev);
                }
        }
        
        /*
         *      Hand the drivers over to the PCI layer now we
         *      are post init.
         */

        list_for_each_safe(l, n, &ide_pci_drivers)
        {
                list_del(l);
                d = list_entry(l, struct pci_driver, node);
                pci_register_driver(d);
        }
}