arch/i386/pci/fixup.c - kernel/msm-4.19 - Gitiles

 /*
  * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
  */

 #include <linux/pci.h>
 #include <linux/init.h>
 #include "pci.h"


 static void __devinit pci_fixup_i450nx(struct pci_dev *d)
 {
 	/*
 	 * i450NX -- Find and scan all secondary buses on all PXB's.
 	 */
 	int pxb, reg;
 	u8 busno, suba, subb;

 	printk(KERN_WARNING "PCI: Searching for i450NX host bridges on %s\n", pci_name(d));
 	reg = 0xd0;
 	for(pxb=0; pxb<2; pxb++) {
 		pci_read_config_byte(d, reg++, &busno);
 		pci_read_config_byte(d, reg++, &suba);
 		pci_read_config_byte(d, reg++, &subb);
 		DBG("i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno, suba, subb);
 		if (busno)
 			pci_scan_bus(busno, &pci_root_ops, NULL);	/* Bus A */
 		if (suba < subb)
 			pci_scan_bus(suba+1, &pci_root_ops, NULL);	/* Bus B */
 	}
 	pcibios_last_bus = -1;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx);

 static void __devinit pci_fixup_i450gx(struct pci_dev *d)
 {
 	/*
 	 * i450GX and i450KX -- Find and scan all secondary buses.
 	 * (called separately for each PCI bridge found)
 	 */
 	u8 busno;
 	pci_read_config_byte(d, 0x4a, &busno);
 	printk(KERN_INFO "PCI: i440KX/GX host bridge %s: secondary bus %02x\n", pci_name(d), busno);
 	pci_scan_bus(busno, &pci_root_ops, NULL);
 	pcibios_last_bus = -1;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx);

 static void __devinit  pci_fixup_umc_ide(struct pci_dev *d)
 {
 	/*
 	 * UM8886BF IDE controller sets region type bits incorrectly,
 	 * therefore they look like memory despite of them being I/O.
 	 */
 	int i;

 	printk(KERN_WARNING "PCI: Fixing base address flags for device %s\n", pci_name(d));
 	for(i=0; i<4; i++)
 		d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);

 static void __devinit  pci_fixup_ncr53c810(struct pci_dev *d)
 {
 	/*
 	 * NCR 53C810 returns class code 0 (at least on some systems).
 	 * Fix class to be PCI_CLASS_STORAGE_SCSI
 	 */
 	if (!d->class) {
 		printk(KERN_WARNING "PCI: fixing NCR 53C810 class code for %s\n", pci_name(d));
 		d->class = PCI_CLASS_STORAGE_SCSI << 8;
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, pci_fixup_ncr53c810);

 static void __devinit pci_fixup_ide_bases(struct pci_dev *d)
 {
 	int i;

 	/*
 	 * PCI IDE controllers use non-standard I/O port decoding, respect it.
 	 */
 	if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
 		return;
 	DBG("PCI: IDE base address fixup for %s\n", pci_name(d));
 	for(i=0; i<4; i++) {
 		struct resource *r = &d->resource[i];
 		if ((r->start & ~0x80) == 0x374) {
 			r->start |= 2;
 			r->end = r->start;
 		}
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);

 static void __devinit  pci_fixup_ide_trash(struct pci_dev *d)
 {
 	int i;

 	/*
 	 * Runs the fixup only for the first IDE controller
 	 * (Shai Fultheim - shai@ftcon.com)
 	 */
 	static int called = 0;
 	if (called)
 		return;
 	called = 1;

 	/*
 	 * There exist PCI IDE controllers which have utter garbage
 	 * in first four base registers. Ignore that.
 	 */
 	DBG("PCI: IDE base address trash cleared for %s\n", pci_name(d));
 	for(i=0; i<4; i++)
 		d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_10, pci_fixup_ide_trash);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_11, pci_fixup_ide_trash);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_9, pci_fixup_ide_trash);

 static void __devinit  pci_fixup_latency(struct pci_dev *d)
 {
 	/*
 	 *  SiS 5597 and 5598 chipsets require latency timer set to
 	 *  at most 32 to avoid lockups.
 	 */
 	DBG("PCI: Setting max latency to 32\n");
 	pcibios_max_latency = 32;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);

 static void __devinit pci_fixup_piix4_acpi(struct pci_dev *d)
 {
 	/*
 	 * PIIX4 ACPI device: hardwired IRQ9
 	 */
 	d->irq = 9;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, pci_fixup_piix4_acpi);

 /*
  * Addresses issues with problems in the memory write queue timer in
  * certain VIA Northbridges.  This bugfix is per VIA's specifications,
  * except for the KL133/KM133: clearing bit 5 on those Northbridges seems
  * to trigger a bug in its integrated ProSavage video card, which
  * causes screen corruption.  We only clear bits 6 and 7 for that chipset,
  * until VIA can provide us with definitive information on why screen
  * corruption occurs, and what exactly those bits do.
  *
  * VIA 8363,8622,8361 Northbridges:
  *  - bits  5, 6, 7 at offset 0x55 need to be turned off
  * VIA 8367 (KT266x) Northbridges:
  *  - bits  5, 6, 7 at offset 0x95 need to be turned off
  * VIA 8363 rev 0x81/0x84 (KL133/KM133) Northbridges:
  *  - bits     6, 7 at offset 0x55 need to be turned off
  */

 #define VIA_8363_KL133_REVISION_ID 0x81
 #define VIA_8363_KM133_REVISION_ID 0x84

 static void __devinit pci_fixup_via_northbridge_bug(struct pci_dev *d)
 {
 	u8 v;
 	u8 revision;
 	int where = 0x55;
 	int mask = 0x1f; /* clear bits 5, 6, 7 by default */

 	pci_read_config_byte(d, PCI_REVISION_ID, &revision);

 	if (d->device == PCI_DEVICE_ID_VIA_8367_0) {
 		/* fix pci bus latency issues resulted by NB bios error
 		   it appears on bug free^Wreduced kt266x's bios forces
 		   NB latency to zero */
 		pci_write_config_byte(d, PCI_LATENCY_TIMER, 0);

 		where = 0x95; /* the memory write queue timer register is
 				different for the KT266x's: 0x95 not 0x55 */
 	} else if (d->device == PCI_DEVICE_ID_VIA_8363_0 &&
 			(revision == VIA_8363_KL133_REVISION_ID ||
 			revision == VIA_8363_KM133_REVISION_ID)) {
 			mask = 0x3f; /* clear only bits 6 and 7; clearing bit 5
 					causes screen corruption on the KL133/KM133 */
 	}

 	pci_read_config_byte(d, where, &v);
 	if (v & ~mask) {
 		printk(KERN_WARNING "Disabling VIA memory write queue (PCI ID %04x, rev %02x): [%02x] %02x & %02x -> %02x\n", \
 			d->device, revision, where, v, mask, v & mask);
 		v &= mask;
 		pci_write_config_byte(d, where, v);
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8367_0, pci_fixup_via_northbridge_bug);

 /*
  * For some reasons Intel decided that certain parts of their
  * 815, 845 and some other chipsets must look like PCI-to-PCI bridges
  * while they are obviously not. The 82801 family (AA, AB, BAM/CAM,
  * BA/CA/DB and E) PCI bridges are actually HUB-to-PCI ones, according
  * to Intel terminology. These devices do forward all addresses from
  * system to PCI bus no matter what are their window settings, so they are
  * "transparent" (or subtractive decoding) from programmers point of view.
  */
 static void __devinit pci_fixup_transparent_bridge(struct pci_dev *dev)
 {
 	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI &&
 	    (dev->device & 0xff00) == 0x2400)
 		dev->transparent = 1;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_fixup_transparent_bridge);

 /*
  * Fixup for C1 Halt Disconnect problem on nForce2 systems.
  *
  * From information provided by "Allen Martin" <AMartin@nvidia.com>:
  *
  * A hang is caused when the CPU generates a very fast CONNECT/HALT cycle
  * sequence.  Workaround is to set the SYSTEM_IDLE_TIMEOUT to 80 ns.
  * This allows the state-machine and timer to return to a proper state within
  * 80 ns of the CONNECT and probe appearing together.  Since the CPU will not
  * issue another HALT within 80 ns of the initial HALT, the failure condition
  * is avoided.
  */
 static void __init pci_fixup_nforce2(struct pci_dev *dev)
 {
 	u32 val;

 	/*
 	 * Chip  Old value   New value
 	 * C17   0x1F0FFF01  0x1F01FF01
 	 * C18D  0x9F0FFF01  0x9F01FF01
 	 *
 	 * Northbridge chip version may be determined by
 	 * reading the PCI revision ID (0xC1 or greater is C18D).
 	 */
 	pci_read_config_dword(dev, 0x6c, &val);

 	/*
 	 * Apply fixup if needed, but don't touch disconnect state
 	 */
 	if ((val & 0x00FF0000) != 0x00010000) {
 		printk(KERN_WARNING "PCI: nForce2 C1 Halt Disconnect fixup\n");
 		pci_write_config_dword(dev, 0x6c, (val & 0xFF00FFFF) | 0x00010000);
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2, pci_fixup_nforce2);

 /* Max PCI Express root ports */
 #define MAX_PCIEROOT	6
 static int quirk_aspm_offset[MAX_PCIEROOT << 3];

 #define GET_INDEX(a, b) (((a - PCI_DEVICE_ID_INTEL_MCH_PA) << 3) + b)

 static int quirk_pcie_aspm_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
 {
 	return raw_pci_ops->read(0, bus->number, devfn, where, size, value);
 }

 /*
  * Replace the original pci bus ops for write with a new one that will filter
  * the request to insure ASPM cannot be enabled.
  */
 static int quirk_pcie_aspm_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
 {
 	u8 offset;

 	offset = quirk_aspm_offset[GET_INDEX(bus->self->device, devfn)];

 	if ((offset) && (where == offset))
 		value = value & 0xfffffffc;

 	return raw_pci_ops->write(0, bus->number, devfn, where, size, value);
 }

 static struct pci_ops quirk_pcie_aspm_ops = {
 	.read = quirk_pcie_aspm_read,
 	.write = quirk_pcie_aspm_write,
 };

 /*
  * Prevents PCI Express ASPM (Active State Power Management) being enabled.
  *
  * Save the register offset, where the ASPM control bits are located,
  * for each PCI Express device that is in the device list of
  * the root port in an array for fast indexing. Replace the bus ops
  * with the modified one.
  */
 static void pcie_rootport_aspm_quirk(struct pci_dev *pdev)
 {
 	int cap_base, i;
 	struct pci_bus  *pbus;
 	struct pci_dev *dev;

 	if ((pbus = pdev->subordinate) == NULL)
 		return;

 	/*
 	 * Check if the DID of pdev matches one of the six root ports. This
 	 * check is needed in the case this function is called directly by the
 	 * hot-plug driver.
 	 */
 	if ((pdev->device < PCI_DEVICE_ID_INTEL_MCH_PA) ||
 	    (pdev->device > PCI_DEVICE_ID_INTEL_MCH_PC1))
 		return;

 	if (list_empty(&pbus->devices)) {
 		/*
 		 * If no device is attached to the root port at power-up or
 		 * after hot-remove, the pbus->devices is empty and this code
 		 * will set the offsets to zero and the bus ops to parent's bus
 		 * ops, which is unmodified.
 	 	 */
 		for (i= GET_INDEX(pdev->device, 0); i <= GET_INDEX(pdev->device, 7); ++i)
 			quirk_aspm_offset[i] = 0;

 		pbus->ops = pbus->parent->ops;
 	} else {
 		/*
 		 * If devices are attached to the root port at power-up or
 		 * after hot-add, the code loops through the device list of
 		 * each root port to save the register offsets and replace the
 		 * bus ops.
 		 */
 		list_for_each_entry(dev, &pbus->devices, bus_list) {
 			/* There are 0 to 8 devices attached to this bus */
 			cap_base = pci_find_capability(dev, PCI_CAP_ID_EXP);
 			quirk_aspm_offset[GET_INDEX(pdev->device, dev->devfn)]= cap_base + 0x10;
 		}
 		pbus->ops = &quirk_pcie_aspm_ops;
 	}
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PA,	pcie_rootport_aspm_quirk );
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PA1,	pcie_rootport_aspm_quirk );
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PB,	pcie_rootport_aspm_quirk );
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PB1,	pcie_rootport_aspm_quirk );
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PC,	pcie_rootport_aspm_quirk );
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PC1,	pcie_rootport_aspm_quirk );

 /*
  * Fixup to mark boot BIOS video selected by BIOS before it changes
  *
  * From information provided by "Jon Smirl" <jonsmirl@gmail.com>
  *
  * The standard boot ROM sequence for an x86 machine uses the BIOS
  * to select an initial video card for boot display. This boot video
  * card will have it's BIOS copied to C0000 in system RAM.
  * IORESOURCE_ROM_SHADOW is used to associate the boot video
  * card with this copy. On laptops this copy has to be used since
  * the main ROM may be compressed or combined with another image.
  * See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW
  * is marked here since the boot video device will be the only enabled
  * video device at this point.
  */

 static void __devinit pci_fixup_video(struct pci_dev *pdev)
 {
 	struct pci_dev *bridge;
 	struct pci_bus *bus;
 	u16 config;

 	if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
 		return;

 	/* Is VGA routed to us? */
 	bus = pdev->bus;
 	while (bus) {
 		bridge = bus->self;
 		if (bridge) {
 			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
 						&config);
 			if (!(config & PCI_BRIDGE_CTL_VGA))
 				return;
 		}
 		bus = bus->parent;
 	}
 	pci_read_config_word(pdev, PCI_COMMAND, &config);
 	if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
 		pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
 		printk(KERN_DEBUG "Boot video device is %s\n", pci_name(pdev));
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video);
	/*
	* Exceptions for specific devices. Usually work-arounds for fatal design flaws.
	*/

	#include <linux/pci.h>
	#include <linux/init.h>
	#include "pci.h"


	static void __devinit pci_fixup_i450nx(struct pci_dev *d)
	{
	/*
	* i450NX -- Find and scan all secondary buses on all PXB's.
	*/
	int pxb, reg;
	u8 busno, suba, subb;

	printk(KERN_WARNING "PCI: Searching for i450NX host bridges on %s\n", pci_name(d));
	reg = 0xd0;
	for(pxb=0; pxb<2; pxb++) {
	pci_read_config_byte(d, reg++, &busno);
	pci_read_config_byte(d, reg++, &suba);
	pci_read_config_byte(d, reg++, &subb);
	DBG("i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno, suba, subb);
	if (busno)
	pci_scan_bus(busno, &pci_root_ops, NULL); /* Bus A */
	if (suba < subb)
	pci_scan_bus(suba+1, &pci_root_ops, NULL); /* Bus B */
	}
	pcibios_last_bus = -1;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx);

	static void __devinit pci_fixup_i450gx(struct pci_dev *d)
	{
	/*
	* i450GX and i450KX -- Find and scan all secondary buses.
	* (called separately for each PCI bridge found)
	*/
	u8 busno;
	pci_read_config_byte(d, 0x4a, &busno);
	printk(KERN_INFO "PCI: i440KX/GX host bridge %s: secondary bus %02x\n", pci_name(d), busno);
	pci_scan_bus(busno, &pci_root_ops, NULL);
	pcibios_last_bus = -1;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx);

	static void __devinit pci_fixup_umc_ide(struct pci_dev *d)
	{
	/*
	* UM8886BF IDE controller sets region type bits incorrectly,
	* therefore they look like memory despite of them being I/O.
	*/
	int i;

	printk(KERN_WARNING "PCI: Fixing base address flags for device %s\n", pci_name(d));
	for(i=0; i<4; i++)
	d->resource[i].flags \|= PCI_BASE_ADDRESS_SPACE_IO;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);

	static void __devinit pci_fixup_ncr53c810(struct pci_dev *d)
	{
	/*
	* NCR 53C810 returns class code 0 (at least on some systems).
	* Fix class to be PCI_CLASS_STORAGE_SCSI
	*/
	if (!d->class) {
	printk(KERN_WARNING "PCI: fixing NCR 53C810 class code for %s\n", pci_name(d));
	d->class = PCI_CLASS_STORAGE_SCSI << 8;
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, pci_fixup_ncr53c810);

	static void __devinit pci_fixup_ide_bases(struct pci_dev *d)
	{
	int i;

	/*
	* PCI IDE controllers use non-standard I/O port decoding, respect it.
	*/
	if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
	return;
	DBG("PCI: IDE base address fixup for %s\n", pci_name(d));
	for(i=0; i<4; i++) {
	struct resource *r = &d->resource[i];
	if ((r->start & ~0x80) == 0x374) {
	r->start \|= 2;
	r->end = r->start;
	}
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);

	static void __devinit pci_fixup_ide_trash(struct pci_dev *d)
	{
	int i;

	/*
	* Runs the fixup only for the first IDE controller
	* (Shai Fultheim - shai@ftcon.com)
	*/
	static int called = 0;
	if (called)
	return;
	called = 1;

	/*
	* There exist PCI IDE controllers which have utter garbage
	* in first four base registers. Ignore that.
	*/
	DBG("PCI: IDE base address trash cleared for %s\n", pci_name(d));
	for(i=0; i<4; i++)
	d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_10, pci_fixup_ide_trash);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_11, pci_fixup_ide_trash);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_9, pci_fixup_ide_trash);

	static void __devinit pci_fixup_latency(struct pci_dev *d)
	{
	/*
	* SiS 5597 and 5598 chipsets require latency timer set to
	* at most 32 to avoid lockups.
	*/
	DBG("PCI: Setting max latency to 32\n");
	pcibios_max_latency = 32;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);

	static void __devinit pci_fixup_piix4_acpi(struct pci_dev *d)
	{
	/*
	* PIIX4 ACPI device: hardwired IRQ9
	*/
	d->irq = 9;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, pci_fixup_piix4_acpi);

	/*
	* Addresses issues with problems in the memory write queue timer in
	* certain VIA Northbridges. This bugfix is per VIA's specifications,
	* except for the KL133/KM133: clearing bit 5 on those Northbridges seems
	* to trigger a bug in its integrated ProSavage video card, which
	* causes screen corruption. We only clear bits 6 and 7 for that chipset,
	* until VIA can provide us with definitive information on why screen
	* corruption occurs, and what exactly those bits do.
	*
	* VIA 8363,8622,8361 Northbridges:
	* - bits 5, 6, 7 at offset 0x55 need to be turned off
	* VIA 8367 (KT266x) Northbridges:
	* - bits 5, 6, 7 at offset 0x95 need to be turned off
	* VIA 8363 rev 0x81/0x84 (KL133/KM133) Northbridges:
	* - bits 6, 7 at offset 0x55 need to be turned off
	*/

	#define VIA_8363_KL133_REVISION_ID 0x81
	#define VIA_8363_KM133_REVISION_ID 0x84

	static void __devinit pci_fixup_via_northbridge_bug(struct pci_dev *d)
	{
	u8 v;
	u8 revision;
	int where = 0x55;
	int mask = 0x1f; /* clear bits 5, 6, 7 by default */

	pci_read_config_byte(d, PCI_REVISION_ID, &revision);

	if (d->device == PCI_DEVICE_ID_VIA_8367_0) {
	/* fix pci bus latency issues resulted by NB bios error
	it appears on bug free^Wreduced kt266x's bios forces
	NB latency to zero */
	pci_write_config_byte(d, PCI_LATENCY_TIMER, 0);

	where = 0x95; /* the memory write queue timer register is
	different for the KT266x's: 0x95 not 0x55 */
	} else if (d->device == PCI_DEVICE_ID_VIA_8363_0 &&
	(revision == VIA_8363_KL133_REVISION_ID \|\|
	revision == VIA_8363_KM133_REVISION_ID)) {
	mask = 0x3f; /* clear only bits 6 and 7; clearing bit 5
	causes screen corruption on the KL133/KM133 */
	}

	pci_read_config_byte(d, where, &v);
	if (v & ~mask) {
	printk(KERN_WARNING "Disabling VIA memory write queue (PCI ID %04x, rev %02x): [%02x] %02x & %02x -> %02x\n", \
	d->device, revision, where, v, mask, v & mask);
	v &= mask;
	pci_write_config_byte(d, where, v);
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8367_0, pci_fixup_via_northbridge_bug);

	/*
	* For some reasons Intel decided that certain parts of their
	* 815, 845 and some other chipsets must look like PCI-to-PCI bridges
	* while they are obviously not. The 82801 family (AA, AB, BAM/CAM,
	* BA/CA/DB and E) PCI bridges are actually HUB-to-PCI ones, according
	* to Intel terminology. These devices do forward all addresses from
	* system to PCI bus no matter what are their window settings, so they are
	* "transparent" (or subtractive decoding) from programmers point of view.
	*/
	static void __devinit pci_fixup_transparent_bridge(struct pci_dev *dev)
	{
	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI &&
	(dev->device & 0xff00) == 0x2400)
	dev->transparent = 1;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_fixup_transparent_bridge);

	/*
	* Fixup for C1 Halt Disconnect problem on nForce2 systems.
	*
	* From information provided by "Allen Martin" <AMartin@nvidia.com>:
	*
	* A hang is caused when the CPU generates a very fast CONNECT/HALT cycle
	* sequence. Workaround is to set the SYSTEM_IDLE_TIMEOUT to 80 ns.
	* This allows the state-machine and timer to return to a proper state within
	* 80 ns of the CONNECT and probe appearing together. Since the CPU will not
	* issue another HALT within 80 ns of the initial HALT, the failure condition
	* is avoided.
	*/
	static void __init pci_fixup_nforce2(struct pci_dev *dev)
	{
	u32 val;

	/*
	* Chip Old value New value
	* C17 0x1F0FFF01 0x1F01FF01
	* C18D 0x9F0FFF01 0x9F01FF01
	*
	* Northbridge chip version may be determined by
	* reading the PCI revision ID (0xC1 or greater is C18D).
	*/
	pci_read_config_dword(dev, 0x6c, &val);

	/*
	* Apply fixup if needed, but don't touch disconnect state
	*/
	if ((val & 0x00FF0000) != 0x00010000) {
	printk(KERN_WARNING "PCI: nForce2 C1 Halt Disconnect fixup\n");
	pci_write_config_dword(dev, 0x6c, (val & 0xFF00FFFF) \| 0x00010000);
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2, pci_fixup_nforce2);

	/* Max PCI Express root ports */
	#define MAX_PCIEROOT 6
	static int quirk_aspm_offset[MAX_PCIEROOT << 3];

	#define GET_INDEX(a, b) (((a - PCI_DEVICE_ID_INTEL_MCH_PA) << 3) + b)

	static int quirk_pcie_aspm_read(struct pci_bus bus, unsigned int devfn, int where, int size, u32 value)
	{
	return raw_pci_ops->read(0, bus->number, devfn, where, size, value);
	}

	/*
	* Replace the original pci bus ops for write with a new one that will filter
	* the request to insure ASPM cannot be enabled.
	*/
	static int quirk_pcie_aspm_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
	{
	u8 offset;

	offset = quirk_aspm_offset[GET_INDEX(bus->self->device, devfn)];

	if ((offset) && (where == offset))
	value = value & 0xfffffffc;

	return raw_pci_ops->write(0, bus->number, devfn, where, size, value);
	}

	static struct pci_ops quirk_pcie_aspm_ops = {
	.read = quirk_pcie_aspm_read,
	.write = quirk_pcie_aspm_write,
	};

	/*
	* Prevents PCI Express ASPM (Active State Power Management) being enabled.
	*
	* Save the register offset, where the ASPM control bits are located,
	* for each PCI Express device that is in the device list of
	* the root port in an array for fast indexing. Replace the bus ops
	* with the modified one.
	*/
	static void pcie_rootport_aspm_quirk(struct pci_dev *pdev)
	{
	int cap_base, i;
	struct pci_bus *pbus;
	struct pci_dev *dev;

	if ((pbus = pdev->subordinate) == NULL)
	return;

	/*
	* Check if the DID of pdev matches one of the six root ports. This
	* check is needed in the case this function is called directly by the
	* hot-plug driver.
	*/
	if ((pdev->device < PCI_DEVICE_ID_INTEL_MCH_PA) \|\|
	(pdev->device > PCI_DEVICE_ID_INTEL_MCH_PC1))
	return;

	if (list_empty(&pbus->devices)) {
	/*
	* If no device is attached to the root port at power-up or
	* after hot-remove, the pbus->devices is empty and this code
	* will set the offsets to zero and the bus ops to parent's bus
	* ops, which is unmodified.
	*/
	for (i= GET_INDEX(pdev->device, 0); i <= GET_INDEX(pdev->device, 7); ++i)
	quirk_aspm_offset[i] = 0;

	pbus->ops = pbus->parent->ops;
	} else {
	/*
	* If devices are attached to the root port at power-up or
	* after hot-add, the code loops through the device list of
	* each root port to save the register offsets and replace the
	* bus ops.
	*/
	list_for_each_entry(dev, &pbus->devices, bus_list) {
	/* There are 0 to 8 devices attached to this bus */
	cap_base = pci_find_capability(dev, PCI_CAP_ID_EXP);
	quirk_aspm_offset[GET_INDEX(pdev->device, dev->devfn)]= cap_base + 0x10;
	}
	pbus->ops = &quirk_pcie_aspm_ops;
	}
	}
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PA, pcie_rootport_aspm_quirk );
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PA1, pcie_rootport_aspm_quirk );
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PB, pcie_rootport_aspm_quirk );
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PB1, pcie_rootport_aspm_quirk );
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PC, pcie_rootport_aspm_quirk );
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PC1, pcie_rootport_aspm_quirk );

	/*
	* Fixup to mark boot BIOS video selected by BIOS before it changes
	*
	* From information provided by "Jon Smirl" <jonsmirl@gmail.com>
	*
	* The standard boot ROM sequence for an x86 machine uses the BIOS
	* to select an initial video card for boot display. This boot video
	* card will have it's BIOS copied to C0000 in system RAM.
	* IORESOURCE_ROM_SHADOW is used to associate the boot video
	* card with this copy. On laptops this copy has to be used since
	* the main ROM may be compressed or combined with another image.
	* See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW
	* is marked here since the boot video device will be the only enabled
	* video device at this point.
	*/

	static void __devinit pci_fixup_video(struct pci_dev *pdev)
	{
	struct pci_dev *bridge;
	struct pci_bus *bus;
	u16 config;

	if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
	return;

	/* Is VGA routed to us? */
	bus = pdev->bus;
	while (bus) {
	bridge = bus->self;
	if (bridge) {
	pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
	&config);
	if (!(config & PCI_BRIDGE_CTL_VGA))
	return;
	}
	bus = bus->parent;
	}
	pci_read_config_word(pdev, PCI_COMMAND, &config);
	if (config & (PCI_COMMAND_IO \| PCI_COMMAND_MEMORY)) {
	pdev->resource[PCI_ROM_RESOURCE].flags \|= IORESOURCE_ROM_SHADOW;
	printk(KERN_DEBUG "Boot video device is %s\n", pci_name(pdev));
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video);