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/*

 * $Id: quirks.c,v 1.1 2004-01-28 18:32:17 giacomo Exp $

 *

 *  This file contains work-arounds for many known PCI hardware

 *  bugs.  Devices present only on certain architectures (host

 *  bridges et cetera) should be handled in arch-specific code.

 *

 *  Copyright (c) 1999 Martin Mares <mj@ucw.cz>

 *

 *  The bridge optimization stuff has been removed. If you really

 *  have a silly BIOS which is unable to set your host bridge right,

 *  use the PowerTweak utility (see http://powertweak.sourceforge.net).

 */

#include <linux/config.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/pci.h>

#include <linux/init.h>

#include <linux/delay.h>

#undef DEBUG

/* Deal with broken BIOS'es that neglect to enable passive release,

   which can cause problems in combination with the 82441FX/PPro MTRRs */

static void __devinit quirk_passive_release(struct pci_dev *dev)

{

        struct pci_dev *d = NULL;

        unsigned char dlc;

        /* We have to make sure a particular bit is set in the PIIX3

           ISA bridge, so we have to go out and find it. */

        while ((d = pci_find_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_0, d))) {

                pci_read_config_byte(d, 0x82, &dlc);

                if (!(dlc & 1<<1)) {

                        printk(KERN_ERR "PCI: PIIX3: Enabling Passive Release on %s\n", pci_name(d));

                        dlc |= 1<<1;

                        pci_write_config_byte(d, 0x82, dlc);

                }

        }

}

/*  The VIA VP2/VP3/MVP3 seem to have some 'features'. There may be a workaround

    but VIA don't answer queries. If you happen to have good contacts at VIA

    ask them for me please -- Alan

    This appears to be BIOS not version dependent. So presumably there is a

    chipset level fix */

int isa_dma_bridge_buggy;               /* Exported */

static void __devinit quirk_isa_dma_hangs(struct pci_dev *dev)

{

        if (!isa_dma_bridge_buggy) {

                isa_dma_bridge_buggy=1;

                printk(KERN_INFO "Activating ISA DMA hang workarounds.\n");

        }

}

int pci_pci_problems;

/*

 *      Chipsets where PCI->PCI transfers vanish or hang

 */

static void __devinit quirk_nopcipci(struct pci_dev *dev)

{

        if((pci_pci_problems&PCIPCI_FAIL)==0)

        {

                printk(KERN_INFO "Disabling direct PCI/PCI transfers.\n");

                pci_pci_problems|=PCIPCI_FAIL;

        }

}

/*

 *      Triton requires workarounds to be used by the drivers

 */

static void __devinit quirk_triton(struct pci_dev *dev)

{

        if((pci_pci_problems&PCIPCI_TRITON)==0)

        {

                printk(KERN_INFO "Limiting direct PCI/PCI transfers.\n");

                pci_pci_problems|=PCIPCI_TRITON;

        }

}

/*

 *      VIA Apollo KT133 needs PCI latency patch

 *      Made according to a windows driver based patch by George E. Breese

 *      see PCI Latency Adjust on http://www.viahardware.com/download/viatweak.shtm

 *      Also see http://www.au-ja.org/review-kt133a-1-en.phtml for

 *      the info on which Mr Breese based his work.

 *

 *      Updated based on further information from the site and also on

 *      information provided by VIA

 */

static void __devinit quirk_vialatency(struct pci_dev *dev)

{

        struct pci_dev *p;

        u8 rev;

        u8 busarb;

        /* Ok we have a potential problem chipset here. Now see if we have

           a buggy southbridge */

        p=pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686, NULL);

        if(p!=NULL)

        {

                pci_read_config_byte(p, PCI_CLASS_REVISION, &rev);

                /* 0x40 - 0x4f == 686B, 0x10 - 0x2f == 686A; thanks Dan Hollis */

                /* Check for buggy part revisions */

                if (rev < 0x40 || rev > 0x42)

                        return;

        }

        else

        {

                p = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231, NULL);

                if(p==NULL)     /* No problem parts */

                        return;

                pci_read_config_byte(p, PCI_CLASS_REVISION, &rev);

                /* Check for buggy part revisions */

                if (rev < 0x10 || rev > 0x12)

                        return;

        }

        /*

         *      Ok we have the problem. Now set the PCI master grant to

         *      occur every master grant. The apparent bug is that under high

         *      PCI load (quite common in Linux of course) you can get data

         *      loss when the CPU is held off the bus for 3 bus master requests

         *      This happens to include the IDE controllers....

         *

         *      VIA only apply this fix when an SB Live! is present but under

         *      both Linux and Windows this isnt enough, and we have seen

         *      corruption without SB Live! but with things like 3 UDMA IDE

         *      controllers. So we ignore that bit of the VIA recommendation..

         */

        pci_read_config_byte(dev, 0x76, &busarb);

        /* Set bit 4 and bi 5 of byte 76 to 0x01

           "Master priority rotation on every PCI master grant */

        busarb &= ~(1<<5);

        busarb |= (1<<4);

        pci_write_config_byte(dev, 0x76, busarb);

        printk(KERN_INFO "Applying VIA southbridge workaround.\n");

}

/*

 *      VIA Apollo VP3 needs ETBF on BT848/878

 */

static void __devinit quirk_viaetbf(struct pci_dev *dev)

{

        if((pci_pci_problems&PCIPCI_VIAETBF)==0)

        {

                printk(KERN_INFO "Limiting direct PCI/PCI transfers.\n");

                pci_pci_problems|=PCIPCI_VIAETBF;

        }

}

static void __devinit quirk_vsfx(struct pci_dev *dev)

{

        if((pci_pci_problems&PCIPCI_VSFX)==0)

        {

                printk(KERN_INFO "Limiting direct PCI/PCI transfers.\n");

                pci_pci_problems|=PCIPCI_VSFX;

        }

}

/*

 *      Ali Magik requires workarounds to be used by the drivers

 *      that DMA to AGP space. Latency must be set to 0xA and triton

 *      workaround applied too

 *      [Info kindly provided by ALi]

 */    

static void __init quirk_alimagik(struct pci_dev *dev)

{

        if((pci_pci_problems&PCIPCI_ALIMAGIK)==0)

        {

                printk(KERN_INFO "Limiting direct PCI/PCI transfers.\n");

                pci_pci_problems|=PCIPCI_ALIMAGIK|PCIPCI_TRITON;

        }

}

/*

 *      Natoma has some interesting boundary conditions with Zoran stuff

 *      at least

 */

static void __devinit quirk_natoma(struct pci_dev *dev)

{

        if((pci_pci_problems&PCIPCI_NATOMA)==0)

        {

                printk(KERN_INFO "Limiting direct PCI/PCI transfers.\n");

                pci_pci_problems|=PCIPCI_NATOMA;

        }

}

/*

 *  S3 868 and 968 chips report region size equal to 32M, but they decode 64M.

 *  If it's needed, re-allocate the region.

 */

static void __devinit quirk_s3_64M(struct pci_dev *dev)

{

        struct resource *r = &dev->resource[0];

        if ((r->start & 0x3ffffff) || r->end != r->start + 0x3ffffff) {

                r->start = 0;

                r->end = 0x3ffffff;

        }

}

static void __devinit quirk_io_region(struct pci_dev *dev, unsigned region, unsigned size, int nr)

{

        region &= ~(size-1);

        if (region) {

                struct resource *res = dev->resource + nr;

                res->name = pci_name(dev);

                res->start = region;

                res->end = region + size - 1;

                res->flags = IORESOURCE_IO;

                pci_claim_resource(dev, nr);

        }

}      

/*

 *      ATI Northbridge setups MCE the processor if you even

 *      read somewhere between 0x3b0->0x3bb or read 0x3d3

 */

static void __devinit quirk_ati_exploding_mce(struct pci_dev *dev)

{

        printk(KERN_INFO "ATI Northbridge, reserving I/O ports 0x3b0 to 0x3bb.\n");

        /* Mae rhaid i ni beidio ag edrych ar y lleoliadiau I/O hyn */

        request_region(0x3b0, 0x0C, "RadeonIGP");

        request_region(0x3d3, 0x01, "RadeonIGP");

}

/*

 * Let's make the southbridge information explicit instead

 * of having to worry about people probing the ACPI areas,

 * for example.. (Yes, it happens, and if you read the wrong

 * ACPI register it will put the machine to sleep with no

 * way of waking it up again. Bummer).

 *

 * ALI M7101: Two IO regions pointed to by words at

 *      0xE0 (64 bytes of ACPI registers)

 *      0xE2 (32 bytes of SMB registers)

 */

static void __devinit quirk_ali7101_acpi(struct pci_dev *dev)

{

        u16 region;

        pci_read_config_word(dev, 0xE0, &region);

        quirk_io_region(dev, region, 64, PCI_BRIDGE_RESOURCES);

        pci_read_config_word(dev, 0xE2, &region);

        quirk_io_region(dev, region, 32, PCI_BRIDGE_RESOURCES+1);

}

/*

 * PIIX4 ACPI: Two IO regions pointed to by longwords at

 *      0x40 (64 bytes of ACPI registers)

 *      0x90 (32 bytes of SMB registers)

 */

static void __devinit quirk_piix4_acpi(struct pci_dev *dev)

{

        u32 region;

        pci_read_config_dword(dev, 0x40, &region);

        quirk_io_region(dev, region, 64, PCI_BRIDGE_RESOURCES);

        pci_read_config_dword(dev, 0x90, &region);

        quirk_io_region(dev, region, 32, PCI_BRIDGE_RESOURCES+1);

}

/*

 * ICH4, ICH4-M, ICH5, ICH5-M ACPI: Three IO regions pointed to by longwords at

 *      0x40 (128 bytes of ACPI, GPIO & TCO registers)

 *      0x58 (64 bytes of GPIO I/O space)

 */

static void __devinit quirk_ich4_lpc_acpi(struct pci_dev *dev)

{

        u32 region;

        pci_read_config_dword(dev, 0x40, &region);

        quirk_io_region(dev, region, 128, PCI_BRIDGE_RESOURCES);

        pci_read_config_dword(dev, 0x58, &region);

        quirk_io_region(dev, region, 64, PCI_BRIDGE_RESOURCES+1);

}

/*

 * VIA ACPI: One IO region pointed to by longword at

 *      0x48 or 0x20 (256 bytes of ACPI registers)

 */

static void __devinit quirk_vt82c586_acpi(struct pci_dev *dev)

{

        u8 rev;

        u32 region;

        pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);

        if (rev & 0x10) {

                pci_read_config_dword(dev, 0x48, &region);

                region &= PCI_BASE_ADDRESS_IO_MASK;

                quirk_io_region(dev, region, 256, PCI_BRIDGE_RESOURCES);

        }

}

/*

 * VIA VT82C686 ACPI: Three IO region pointed to by (long)words at

 *      0x48 (256 bytes of ACPI registers)

 *      0x70 (128 bytes of hardware monitoring register)

 *      0x90 (16 bytes of SMB registers)

 */

static void __devinit quirk_vt82c686_acpi(struct pci_dev *dev)

{

        u16 hm;

        u32 smb;

        quirk_vt82c586_acpi(dev);

        pci_read_config_word(dev, 0x70, &hm);

        hm &= PCI_BASE_ADDRESS_IO_MASK;

        quirk_io_region(dev, hm, 128, PCI_BRIDGE_RESOURCES + 1);

        pci_read_config_dword(dev, 0x90, &smb);

        smb &= PCI_BASE_ADDRESS_IO_MASK;

        quirk_io_region(dev, smb, 16, PCI_BRIDGE_RESOURCES + 2);

}

#ifdef CONFIG_X86_IO_APIC 

#include <asm/io_apic.h>

/*

 * VIA 686A/B: If an IO-APIC is active, we need to route all on-chip

 * devices to the external APIC.

 *

 * TODO: When we have device-specific interrupt routers,

 * this code will go away from quirks.

 */

static void __devinit quirk_via_ioapic(struct pci_dev *dev)

{

        u8 tmp;

        if (nr_ioapics < 1)

                tmp = 0;    /* nothing routed to external APIC */

        else

                tmp = 0x1f; /* all known bits (4-0) routed to external APIC */

        printk(KERN_INFO "PCI: %sbling Via external APIC routing\n",

               tmp == 0 ? "Disa" : "Ena");

        /* Offset 0x58: External APIC IRQ output control */

        pci_write_config_byte (dev, 0x58, tmp);

}

/*

 * The AMD io apic can hang the box when an apic irq is masked.

 * We check all revs >= B0 (yet not in the pre production!) as the bug

 * is currently marked NoFix

 *

 * We have multiple reports of hangs with this chipset that went away with

 * noapic specified. For the moment we assume its the errata. We may be wrong

 * of course. However the advice is demonstrably good even if so..

 */

static void __devinit quirk_amd_ioapic(struct pci_dev *dev)

{

        u8 rev;

        pci_read_config_byte(dev, PCI_REVISION_ID, &rev);

        if(rev >= 0x02)

        {

                printk(KERN_WARNING "I/O APIC: AMD Errata #22 may be present. In the event of instability try\n");

                printk(KERN_WARNING "        : booting with the \"noapic\" option.\n");

        }

}

static void __init quirk_ioapic_rmw(struct pci_dev *dev)

{

        if (dev->devfn == 0 && dev->bus->number == 0)

                sis_apic_bug = 1;

}

#define AMD8131_revA0        0x01

#define AMD8131_revB0        0x11

#define AMD8131_MISC         0x40

#define AMD8131_NIOAMODE_BIT 0

static void __init quirk_amd_8131_ioapic(struct pci_dev *dev)

{

        unsigned char revid, tmp;

        if (nr_ioapics == 0)

                return;

        pci_read_config_byte(dev, PCI_REVISION_ID, &revid);

        if (revid == AMD8131_revA0 || revid == AMD8131_revB0) {

                printk(KERN_INFO "Fixing up AMD8131 IOAPIC mode\n");

                pci_read_config_byte( dev, AMD8131_MISC, &tmp);

                tmp &= ~(1 << AMD8131_NIOAMODE_BIT);

                pci_write_config_byte( dev, AMD8131_MISC, tmp);

        }

}

#endif /* CONFIG_X86_IO_APIC */

/*

 * Via 686A/B:  The PCI_INTERRUPT_LINE register for the on-chip

 * devices, USB0/1, AC97, MC97, and ACPI, has an unusual feature:

 * when written, it makes an internal connection to the PIC.

 * For these devices, this register is defined to be 4 bits wide.

 * Normally this is fine.  However for IO-APIC motherboards, or

 * non-x86 architectures (yes Via exists on PPC among other places),

 * we must mask the PCI_INTERRUPT_LINE value versus 0xf to get

 * interrupts delivered properly.

 *

 * TODO: When we have device-specific interrupt routers,

 * quirk_via_irqpic will go away from quirks.

 */

/*

 * FIXME: it is questionable that quirk_via_acpi

 * is needed.  It shows up as an ISA bridge, and does not

 * support the PCI_INTERRUPT_LINE register at all.  Therefore

 * it seems like setting the pci_dev's 'irq' to the

 * value of the ACPI SCI interrupt is only done for convenience.

 *      -jgarzik

 */

static void __devinit quirk_via_acpi(struct pci_dev *d)

{

        /*

         * VIA ACPI device: SCI IRQ line in PCI config byte 0x42

         */

        u8 irq;

        pci_read_config_byte(d, 0x42, &irq);

        irq &= 0xf;

        if (irq && (irq != 2))

                d->irq = irq;

}

static void __devinit quirk_via_irqpic(struct pci_dev *dev)

{

        u8 irq, new_irq = dev->irq & 0xf;

        pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);

        if (new_irq != irq) {

                printk(KERN_INFO "PCI: Via IRQ fixup for %s, from %d to %d\n",

                       pci_name(dev), irq, new_irq);

                udelay(15);

                pci_write_config_byte(dev, PCI_INTERRUPT_LINE, new_irq);

        }

}

/*

 * PIIX3 USB: We have to disable USB interrupts that are

 * hardwired to PIRQD# and may be shared with an

 * external device.

 *

 * Legacy Support Register (LEGSUP):

 *     bit13:  USB PIRQ Enable (USBPIRQDEN),

 *     bit4:   Trap/SMI On IRQ Enable (USBSMIEN).

 *

 * We mask out all r/wc bits, too.

 */

static void __devinit quirk_piix3_usb(struct pci_dev *dev)

{

        u16 legsup;

        pci_read_config_word(dev, 0xc0, &legsup);

        legsup &= 0x50ef;

        pci_write_config_word(dev, 0xc0, legsup);

}

/*

 * VIA VT82C598 has its device ID settable and many BIOSes

 * set it to the ID of VT82C597 for backward compatibility.

 * We need to switch it off to be able to recognize the real

 * type of the chip.

 */

static void __devinit quirk_vt82c598_id(struct pci_dev *dev)

{

        pci_write_config_byte(dev, 0xfc, 0);

        pci_read_config_word(dev, PCI_DEVICE_ID, &dev->device);

}

/*

 * CardBus controllers have a legacy base address that enables them

 * to respond as i82365 pcmcia controllers.  We don't want them to

 * do this even if the Linux CardBus driver is not loaded, because

 * the Linux i82365 driver does not (and should not) handle CardBus.

 */

static void __devinit quirk_cardbus_legacy(struct pci_dev *dev)

{

        if ((PCI_CLASS_BRIDGE_CARDBUS << 8) ^ dev->class)

                return;

        pci_write_config_dword(dev, PCI_CB_LEGACY_MODE_BASE, 0);

}

/*

 * Following the PCI ordering rules is optional on the AMD762. I'm not

 * sure what the designers were smoking but let's not inhale...

 *

 * To be fair to AMD, it follows the spec by default, its BIOS people

 * who turn it off!

 */

static void __devinit quirk_amd_ordering(struct pci_dev *dev)

{

        u32 pcic;

        pci_read_config_dword(dev, 0x4C, &pcic);

        if((pcic&6)!=6)

        {

                pcic |= 6;

                printk(KERN_WARNING "BIOS failed to enable PCI standards compliance, fixing this error.\n");

                pci_write_config_dword(dev, 0x4C, pcic);

                pci_read_config_dword(dev, 0x84, &pcic);

                pcic |= (1<<23);        /* Required in this mode */

                pci_write_config_dword(dev, 0x84, pcic);

        }

}

/*

 *      DreamWorks provided workaround for Dunord I-3000 problem

 *

 *      This card decodes and responds to addresses not apparently

 *      assigned to it. We force a larger allocation to ensure that

 *      nothing gets put too close to it.

 */

static void __devinit quirk_dunord ( struct pci_dev * dev )

{

        struct resource * r = & dev -> resource [ 1 ];

        r -> start = 0;

        r -> end = 0xffffff;

}

static void __devinit quirk_transparent_bridge(struct pci_dev *dev)

{

        dev->transparent = 1;

}

/*

 * Common misconfiguration of the MediaGX/Geode PCI master that will

 * reduce PCI bandwidth from 70MB/s to 25MB/s.  See the GXM/GXLV/GX1

 * datasheets found at http://www.national.com/ds/GX for info on what

 * these bits do.  <christer@weinigel.se>

 */

static void __init quirk_mediagx_master(struct pci_dev *dev)

{

        u8 reg;

        pci_read_config_byte(dev, 0x41, &reg);

        if (reg & 2) {

                reg &= ~2;

                printk(KERN_INFO "PCI: Fixup for MediaGX/Geode Slave Disconnect Boundary (0x41=0x%02x)\n", reg);

                pci_write_config_byte(dev, 0x41, reg);

        }

}

/*

 * As per PCI spec, ignore base address registers 0-3 of the IDE controllers

 * running in Compatible mode (bits 0 and 2 in the ProgIf for primary and

 * secondary channels respectively). If the device reports Compatible mode

 * but does use BAR0-3 for address decoding, we assume that firmware has

 * programmed these BARs with standard values (0x1f0,0x3f4 and 0x170,0x374).

 * Exceptions (if they exist) must be handled in chip/architecture specific

 * fixups.

 *

 * Note: for non x86 people. You may need an arch specific quirk to handle

 * moving IDE devices to native mode as well. Some plug in card devices power

 * up in compatible mode and assume the BIOS will adjust them.

 *

 * Q: should we load the 0x1f0,0x3f4 into the registers or zap them as

 * we do now ? We don't want is pci_enable_device to come along

 * and assign new resources. Both approaches work for that.

 */

static void __devinit quirk_ide_bases(struct pci_dev *dev)

{

       struct resource *res;

       int first_bar = 2, last_bar = 0;

       if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)

               return;

       res = &dev->resource[0];

       /* primary channel: ProgIf bit 0, BAR0, BAR1 */

       if (!(dev->class & 1) && (res[0].flags || res[1].flags)) {

               res[0].start = res[0].end = res[0].flags = 0;

               res[1].start = res[1].end = res[1].flags = 0;

               first_bar = 0;

               last_bar = 1;

       }

       /* secondary channel: ProgIf bit 2, BAR2, BAR3 */

       if (!(dev->class & 4) && (res[2].flags || res[3].flags)) {

               res[2].start = res[2].end = res[2].flags = 0;

               res[3].start = res[3].end = res[3].flags = 0;

               last_bar = 3;

       }

       if (!last_bar)

               return;

       printk(KERN_INFO "PCI: Ignoring BAR%d-%d of IDE controller %s\n",

              first_bar, last_bar, pci_name(dev));

}

/*

 *      Ensure C0 rev restreaming is off. This is normally done by

 *      the BIOS but in the odd case it is not the results are corruption

 *      hence the presence of a Linux check

 */

static void __init quirk_disable_pxb(struct pci_dev *pdev)

{

        u16 config;

        u8 rev;

        pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);

        if(rev != 0x04)         /* Only C0 requires this */

                return;

        pci_read_config_word(pdev, 0x40, &config);

        if(config & (1<<6))

        {

                config &= ~(1<<6);

                pci_write_config_word(pdev, 0x40, config);

                printk(KERN_INFO "PCI: C0 revision 450NX. Disabling PCI restreaming.\n");

        }

}

/*

 *      VIA northbridges care about PCI_INTERRUPT_LINE

 */

int interrupt_line_quirk;

static void __devinit quirk_via_bridge(struct pci_dev *pdev)

{

        if(pdev->devfn == 0)

                interrupt_line_quirk = 1;

}

/*

 *      Serverworks CSB5 IDE does not fully support native mode

 */

static void __init quirk_svwks_csb5ide(struct pci_dev *pdev)

{

        u8 prog;

        pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);

        if (prog & 5) {

                prog &= ~5;

                pdev->class &= ~5;

                pci_write_config_byte(pdev, PCI_CLASS_PROG, prog);

                /* need to re-assign BARs for compat mode */

                quirk_ide_bases(pdev);

        }

}

/* This was originally an Alpha specific thing, but it really fits here.

 * The i82375 PCI/EISA bridge appears as non-classified. Fix that.

 */

static void __init quirk_eisa_bridge(struct pci_dev *dev)

{

        dev->class = PCI_CLASS_BRIDGE_EISA << 8;

}

/*

 * On ASUS P4B boards, the SMBus PCI Device within the ICH2/4 southbridge

 * is not activated. The myth is that Asus said that they do not want the

 * users to be irritated by just another PCI Device in the Win98 device

 * manager. (see the file prog/hotplug/README.p4b in the lm_sensors

 * package 2.7.0 for details)

 *

 * The SMBus PCI Device can be activated by setting a bit in the ICH LPC

 * bridge. Unfortunately, this device has no subvendor/subdevice ID. So it

 * becomes necessary to do this tweak in two steps -- I've chosen the Host

 * bridge as trigger.

 */

static int __initdata asus_hides_smbus = 0;

static void __init asus_hides_smbus_hostbridge(struct pci_dev *dev)

{

        if (likely(dev->subsystem_vendor != PCI_VENDOR_ID_ASUSTEK))

                return;

        if (dev->device == PCI_DEVICE_ID_INTEL_82845_HB)

                switch(dev->subsystem_device) {

                case 0x8070: /* P4B */

                case 0x8088: /* P4B533 */

                        asus_hides_smbus = 1;

                }

        if ((dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) &&

            (dev->subsystem_device == 0x80b2)) /* P4PE */

                asus_hides_smbus = 1;

        if ((dev->device == PCI_DEVICE_ID_INTEL_82850_HB) &&

            (dev->subsystem_device == 0x8030)) /* P4T533 */

                asus_hides_smbus = 1;

        if ((dev->device == PCI_DEVICE_ID_INTEL_7205_0) &&

            (dev->subsystem_device == 0x8070)) /* P4G8X Deluxe */

                asus_hides_smbus = 1;

        return;

}

static void __init asus_hides_smbus_lpc(struct pci_dev *dev)

{

        u16 val;

        if (likely(!asus_hides_smbus))

                return;

        pci_read_config_word(dev, 0xF2, &val);

        if (val & 0x8) {

                pci_write_config_word(dev, 0xF2, val & (~0x8));

                pci_read_config_word(dev, 0xF2, &val);

                if(val & 0x8)

                        printk(KERN_INFO "PCI: i801 SMBus device continues to play 'hide and seek'! 0x%x\n", val);

                else

                        printk(KERN_INFO "PCI: Enabled i801 SMBus device\n");

        }

}

/*

 * SiS 96x south bridge: BIOS typically hides SMBus device...

 */

static void __init quirk_sis_96x_smbus(struct pci_dev *dev)

{

        u8 val = 0;

        printk(KERN_INFO "Enabling SiS 96x SMBus.\n");

        pci_read_config_byte(dev, 0x77, &val);

        pci_write_config_byte(dev, 0x77, val & ~0x10);

        pci_read_config_byte(dev, 0x77, &val);

}

/*

 * ... This is further complicated by the fact that some SiS96x south

 * bridges pretend to be 85C503/5513 instead.  In that case see if we

 * spotted a compatible north bridge to make sure.

 * (pci_find_device doesn't work yet)

 *

 * We can also enable the sis96x bit in the discovery register..

 */

static int __devinitdata sis_96x_compatible = 0;

#define SIS_DETECT_REGISTER 0x40

static void __init quirk_sis_503_smbus(struct pci_dev *dev)

{

        u8 reg;

        u16 devid;

        pci_read_config_byte(dev, SIS_DETECT_REGISTER, &reg);

        pci_write_config_byte(dev, SIS_DETECT_REGISTER, reg | (1 << 6));

        pci_read_config_word(dev, PCI_DEVICE_ID, &devid);

        if ((devid & 0xfff0) != 0x0960) {

                pci_write_config_byte(dev, SIS_DETECT_REGISTER, reg);

                return;

        }

        /* Make people aware that we changed the config.. */

        printk(KERN_WARNING "Uncovering SIS%x that hid as a SIS503 (compatible=%d)\n", devid, sis_96x_compatible);

        /*

         * Ok, it now shows up as a 96x.. The 96x quirks are after

         * the 503 quirk in the quirk table, so they'll automatically

         * run and enable things like the SMBus device

         */

        dev->device = devid;

}

static void __init quirk_sis_96x_compatible(struct pci_dev *dev)

{

        sis_96x_compatible = 1;

}

#ifdef CONFIG_SCSI_SATA

static void __init quirk_intel_ide_combined(struct pci_dev *pdev)

{

        u8 prog, comb, tmp;

        /*

         * Narrow down to Intel SATA PCI devices.

         */

        switch (pdev->device) {

        /* PCI ids taken from drivers/scsi/ata_piix.c */

        case 0x24d1:

        case 0x24df:

        case 0x25a3:

        case 0x25b0:

                break;

        default:

                /* we do not handle this PCI device */

                return;

        }

        /*

         * Read combined mode register.

         */

        pci_read_config_byte(pdev, 0x90, &tmp); /* combined mode reg */

        tmp &= 0x6;     /* interesting bits 2:1, PATA primary/secondary */

        if (tmp == 0x4)         /* bits 10x */

                comb = (1 << 0);                /* SATA port 0, PATA port 1 */

        else if (tmp == 0x6)    /* bits 11x */

                comb = (1 << 2);                /* PATA port 0, SATA port 1 */

        else

                return;                         /* not in combined mode */

        /*

         * Read programming interface register.

         * (Tells us if it's legacy or native mode)

         */

        pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);

        /* if SATA port is in native mode, we're ok. */

        if (prog & comb)

                return;

        /* SATA port is in legacy mode.  Reserve port so that

         * IDE driver does not attempt to use it.  If request_region

         * fails, it will be obvious at boot time, so we don't bother

         * checking return values.