arch/x86/pci/fixup.c - maze/linux - Git at Google

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

 #include <linux/delay.h>
 #include <linux/dmi.h>
 #include <linux/pci.h>
 #include <linux/vgaarb.h>
 #include <asm/pci_x86.h>

 static void 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;

 	dev_warn(&d->dev, "Searching for i450NX host bridges\n");
 	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);
 		dev_dbg(&d->dev, "i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno,
 			suba, subb);
 		if (busno)
 			pcibios_scan_root(busno);	/* Bus A */
 		if (suba < subb)
 			pcibios_scan_root(suba+1);	/* Bus B */
 	}
 	pcibios_last_bus = -1;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx);

 static void 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);
 	dev_info(&d->dev, "i440KX/GX host bridge; secondary bus %02x\n", busno);
 	pcibios_scan_root(busno);
 	pcibios_last_bus = -1;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx);

 static void 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;

 	dev_warn(&d->dev, "Fixing base address flags\n");
 	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 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) {
 		dev_warn(&d->dev, "Fixing NCR 53C810 class code\n");
 		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 pci_fixup_latency(struct pci_dev *d)
 {
 	/*
 	 *  SiS 5597 and 5598 chipsets require latency timer set to
 	 *  at most 32 to avoid lockups.
 	 */
 	dev_dbg(&d->dev, "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 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 pci_fixup_via_northbridge_bug(struct pci_dev *d)
 {
 	u8 v;
 	int where = 0x55;
 	int mask = 0x1f; /* clear bits 5, 6, 7 by default */

 	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 &&
 			(d->revision == VIA_8363_KL133_REVISION_ID ||
 			d->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) {
 		dev_warn(&d->dev, "Disabling VIA memory write queue (PCI ID %04x, rev %02x): [%02x] %02x & %02x -> %02x\n", \
 			d->device, d->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);
 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug);
 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug);
 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug);
 DECLARE_PCI_FIXUP_RESUME(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 pci_fixup_transparent_bridge(struct pci_dev *dev)
 {
 	if ((dev->device & 0xff00) == 0x2400)
 		dev->transparent = 1;
 }
 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
 			 PCI_CLASS_BRIDGE_PCI, 8, 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 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) {
 		dev_warn(&dev->dev, "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);
 DECLARE_PCI_FIXUP_RESUME(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) & 7))

 static int quirk_pcie_aspm_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
 {
 	return raw_pci_read(pci_domain_nr(bus), 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 & ~PCI_EXP_LNKCTL_ASPMC;

 	return raw_pci_write(pci_domain_nr(bus), 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 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;

 		pci_bus_set_ops(pbus, 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 */
 			quirk_aspm_offset[GET_INDEX(pdev->device, dev->devfn)] =
 				dev->pcie_cap + PCI_EXP_LNKCTL;

 		pci_bus_set_ops(pbus, &quirk_pcie_aspm_ops);
 		dev_info(&pbus->dev, "writes to ASPM control bits will be ignored\n");
 	}

 }
 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. Before marking the device
  * with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set
  * by either arch cde or vga-arbitration, if so only apply the fixup to this
  * already determined primary video card.
  */

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

 	/* Is VGA routed to us? */
 	bus = pdev->bus;
 	while (bus) {
 		bridge = bus->self;

 		/*
 		 * From information provided by
 		 * "David Miller" <davem@davemloft.net>
 		 * The bridge control register is valid for PCI header
 		 * type BRIDGE, or CARDBUS. Host to PCI controllers use
 		 * PCI header type NORMAL.
 		 */
 		if (bridge
 		    && ((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 		       || (bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
 			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
 						&config);
 			if (!(config & PCI_BRIDGE_CTL_VGA))
 				return;
 		}
 		bus = bus->parent;
 	}
 	if (!vga_default_device() || pdev == vga_default_device()) {
 		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;
 			dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n");
 			vga_set_default_device(pdev);
 		}
 	}
 }
 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
 				PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video);


 static const struct dmi_system_id msi_k8t_dmi_table[] = {
 	{
 		.ident = "MSI-K8T-Neo2Fir",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "MS-6702E"),
 		},
 	},
 	{}
 };

 /*
  * The AMD-Athlon64 board MSI "K8T Neo2-FIR" disables the onboard sound
  * card if a PCI-soundcard is added.
  *
  * The BIOS only gives options "DISABLED" and "AUTO". This code sets
  * the corresponding register-value to enable the soundcard.
  *
  * The soundcard is only enabled, if the mainborad is identified
  * via DMI-tables and the soundcard is detected to be off.
  */
 static void pci_fixup_msi_k8t_onboard_sound(struct pci_dev *dev)
 {
 	unsigned char val;
 	if (!dmi_check_system(msi_k8t_dmi_table))
 		return; /* only applies to MSI K8T Neo2-FIR */

 	pci_read_config_byte(dev, 0x50, &val);
 	if (val & 0x40) {
 		pci_write_config_byte(dev, 0x50, val & (~0x40));

 		/* verify the change for status output */
 		pci_read_config_byte(dev, 0x50, &val);
 		if (val & 0x40)
 			dev_info(&dev->dev, "Detected MSI K8T Neo2-FIR; "
 					"can't enable onboard soundcard!\n");
 		else
 			dev_info(&dev->dev, "Detected MSI K8T Neo2-FIR; "
 					"enabled onboard soundcard\n");
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
 		pci_fixup_msi_k8t_onboard_sound);
 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
 		pci_fixup_msi_k8t_onboard_sound);

 /*
  * Some Toshiba laptops need extra code to enable their TI TSB43AB22/A.
  *
  * We pretend to bring them out of full D3 state, and restore the proper
  * IRQ, PCI cache line size, and BARs, otherwise the device won't function
  * properly.  In some cases, the device will generate an interrupt on
  * the wrong IRQ line, causing any devices sharing the line it's
  * *supposed* to use to be disabled by the kernel's IRQ debug code.
  */
 static u16 toshiba_line_size;

 static const struct dmi_system_id toshiba_ohci1394_dmi_table[] = {
 	{
 		.ident = "Toshiba PS5 based laptop",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 			DMI_MATCH(DMI_PRODUCT_VERSION, "PS5"),
 		},
 	},
 	{
 		.ident = "Toshiba PSM4 based laptop",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 			DMI_MATCH(DMI_PRODUCT_VERSION, "PSM4"),
 		},
 	},
 	{
 		.ident = "Toshiba A40 based laptop",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 			DMI_MATCH(DMI_PRODUCT_VERSION, "PSA40U"),
 		},
 	},
 	{ }
 };

 static void pci_pre_fixup_toshiba_ohci1394(struct pci_dev *dev)
 {
 	if (!dmi_check_system(toshiba_ohci1394_dmi_table))
 		return; /* only applies to certain Toshibas (so far) */

 	dev->current_state = PCI_D3cold;
 	pci_read_config_word(dev, PCI_CACHE_LINE_SIZE, &toshiba_line_size);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TI, 0x8032,
 			 pci_pre_fixup_toshiba_ohci1394);

 static void pci_post_fixup_toshiba_ohci1394(struct pci_dev *dev)
 {
 	if (!dmi_check_system(toshiba_ohci1394_dmi_table))
 		return; /* only applies to certain Toshibas (so far) */

 	/* Restore config space on Toshiba laptops */
 	pci_write_config_word(dev, PCI_CACHE_LINE_SIZE, toshiba_line_size);
 	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, (u8 *)&dev->irq);
 	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
 			       pci_resource_start(dev, 0));
 	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
 			       pci_resource_start(dev, 1));
 }
 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_TI, 0x8032,
 			 pci_post_fixup_toshiba_ohci1394);


 /*
  * Prevent the BIOS trapping accesses to the Cyrix CS5530A video device
  * configuration space.
  */
 static void pci_early_fixup_cyrix_5530(struct pci_dev *dev)
 {
 	u8 r;
 	/* clear 'F4 Video Configuration Trap' bit */
 	pci_read_config_byte(dev, 0x42, &r);
 	r &= 0xfd;
 	pci_write_config_byte(dev, 0x42, r);
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY,
 			pci_early_fixup_cyrix_5530);
 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY,
 			pci_early_fixup_cyrix_5530);

 /*
  * Siemens Nixdorf AG FSC Multiprocessor Interrupt Controller:
  * prevent update of the BAR0, which doesn't look like a normal BAR.
  */
 static void pci_siemens_interrupt_controller(struct pci_dev *dev)
 {
 	dev->resource[0].flags |= IORESOURCE_PCI_FIXED;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SIEMENS, 0x0015,
 			  pci_siemens_interrupt_controller);

 /*
  * SB600: Disable BAR1 on device 14.0 to avoid HPET resources from
  * confusing the PCI engine:
  */
 static void sb600_disable_hpet_bar(struct pci_dev *dev)
 {
 	u8 val;

 	/*
 	 * The SB600 and SB700 both share the same device
 	 * ID, but the PM register 0x55 does something different
 	 * for the SB700, so make sure we are dealing with the
 	 * SB600 before touching the bit:
 	 */

 	pci_read_config_byte(dev, 0x08, &val);

 	if (val < 0x2F) {
 		outb(0x55, 0xCD6);
 		val = inb(0xCD7);

 		/* Set bit 7 in PM register 0x55 */
 		outb(0x55, 0xCD6);
 		outb(val | 0x80, 0xCD7);
 	}
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar);

 /*
  * Twinhead H12Y needs us to block out a region otherwise we map devices
  * there and any access kills the box.
  *
  *   See: https://bugzilla.kernel.org/show_bug.cgi?id=10231
  *
  * Match off the LPC and svid/sdid (older kernels lose the bridge subvendor)
  */
 static void twinhead_reserve_killing_zone(struct pci_dev *dev)
 {
         if (dev->subsystem_vendor == 0x14FF && dev->subsystem_device == 0xA003) {
                 pr_info("Reserving memory on Twinhead H12Y\n");
                 request_mem_region(0xFFB00000, 0x100000, "twinhead");
         }
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone);
	/*
	* Exceptions for specific devices. Usually work-arounds for fatal design flaws.
	*/

	#include <linux/delay.h>
	#include <linux/dmi.h>
	#include <linux/pci.h>
	#include <linux/vgaarb.h>
	#include <asm/pci_x86.h>

	static void 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;

	dev_warn(&d->dev, "Searching for i450NX host bridges\n");
	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);
	dev_dbg(&d->dev, "i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno,
	suba, subb);
	if (busno)
	pcibios_scan_root(busno); /* Bus A */
	if (suba < subb)
	pcibios_scan_root(suba+1); /* Bus B */
	}
	pcibios_last_bus = -1;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx);

	static void 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);
	dev_info(&d->dev, "i440KX/GX host bridge; secondary bus %02x\n", busno);
	pcibios_scan_root(busno);
	pcibios_last_bus = -1;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx);

	static void 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;

	dev_warn(&d->dev, "Fixing base address flags\n");
	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 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) {
	dev_warn(&d->dev, "Fixing NCR 53C810 class code\n");
	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 pci_fixup_latency(struct pci_dev *d)
	{
	/*
	* SiS 5597 and 5598 chipsets require latency timer set to
	* at most 32 to avoid lockups.
	*/
	dev_dbg(&d->dev, "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 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 pci_fixup_via_northbridge_bug(struct pci_dev *d)
	{
	u8 v;
	int where = 0x55;
	int mask = 0x1f; /* clear bits 5, 6, 7 by default */

	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 &&
	(d->revision == VIA_8363_KL133_REVISION_ID \|\|
	d->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) {
	dev_warn(&d->dev, "Disabling VIA memory write queue (PCI ID %04x, rev %02x): [%02x] %02x & %02x -> %02x\n", \
	d->device, d->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);
	DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug);
	DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug);
	DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug);
	DECLARE_PCI_FIXUP_RESUME(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 pci_fixup_transparent_bridge(struct pci_dev *dev)
	{
	if ((dev->device & 0xff00) == 0x2400)
	dev->transparent = 1;
	}
	DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
	PCI_CLASS_BRIDGE_PCI, 8, 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 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) {
	dev_warn(&dev->dev, "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);
	DECLARE_PCI_FIXUP_RESUME(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) & 7))

	static int quirk_pcie_aspm_read(struct pci_bus bus, unsigned int devfn, int where, int size, u32 value)
	{
	return raw_pci_read(pci_domain_nr(bus), 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 & ~PCI_EXP_LNKCTL_ASPMC;

	return raw_pci_write(pci_domain_nr(bus), 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 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;

	pci_bus_set_ops(pbus, 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 */
	quirk_aspm_offset[GET_INDEX(pdev->device, dev->devfn)] =
	dev->pcie_cap + PCI_EXP_LNKCTL;

	pci_bus_set_ops(pbus, &quirk_pcie_aspm_ops);
	dev_info(&pbus->dev, "writes to ASPM control bits will be ignored\n");
	}

	}
	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. Before marking the device
	* with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set
	* by either arch cde or vga-arbitration, if so only apply the fixup to this
	* already determined primary video card.
	*/

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

	/* Is VGA routed to us? */
	bus = pdev->bus;
	while (bus) {
	bridge = bus->self;

	/*
	* From information provided by
	* "David Miller" <davem@davemloft.net>
	* The bridge control register is valid for PCI header
	* type BRIDGE, or CARDBUS. Host to PCI controllers use
	* PCI header type NORMAL.
	*/
	if (bridge
	&& ((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
	\|\| (bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
	pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
	&config);
	if (!(config & PCI_BRIDGE_CTL_VGA))
	return;
	}
	bus = bus->parent;
	}
	if (!vga_default_device() \|\| pdev == vga_default_device()) {
	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;
	dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n");
	vga_set_default_device(pdev);
	}
	}
	}
	DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
	PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video);


	static const struct dmi_system_id msi_k8t_dmi_table[] = {
	{
	.ident = "MSI-K8T-Neo2Fir",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
	DMI_MATCH(DMI_PRODUCT_NAME, "MS-6702E"),
	},
	},
	{}
	};

	/*
	* The AMD-Athlon64 board MSI "K8T Neo2-FIR" disables the onboard sound
	* card if a PCI-soundcard is added.
	*
	* The BIOS only gives options "DISABLED" and "AUTO". This code sets
	* the corresponding register-value to enable the soundcard.
	*
	* The soundcard is only enabled, if the mainborad is identified
	* via DMI-tables and the soundcard is detected to be off.
	*/
	static void pci_fixup_msi_k8t_onboard_sound(struct pci_dev *dev)
	{
	unsigned char val;
	if (!dmi_check_system(msi_k8t_dmi_table))
	return; /* only applies to MSI K8T Neo2-FIR */

	pci_read_config_byte(dev, 0x50, &val);
	if (val & 0x40) {
	pci_write_config_byte(dev, 0x50, val & (~0x40));

	/* verify the change for status output */
	pci_read_config_byte(dev, 0x50, &val);
	if (val & 0x40)
	dev_info(&dev->dev, "Detected MSI K8T Neo2-FIR; "
	"can't enable onboard soundcard!\n");
	else
	dev_info(&dev->dev, "Detected MSI K8T Neo2-FIR; "
	"enabled onboard soundcard\n");
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
	pci_fixup_msi_k8t_onboard_sound);
	DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
	pci_fixup_msi_k8t_onboard_sound);

	/*
	* Some Toshiba laptops need extra code to enable their TI TSB43AB22/A.
	*
	* We pretend to bring them out of full D3 state, and restore the proper
	* IRQ, PCI cache line size, and BARs, otherwise the device won't function
	* properly. In some cases, the device will generate an interrupt on
	* the wrong IRQ line, causing any devices sharing the line it's
	* supposed to use to be disabled by the kernel's IRQ debug code.
	*/
	static u16 toshiba_line_size;

	static const struct dmi_system_id toshiba_ohci1394_dmi_table[] = {
	{
	.ident = "Toshiba PS5 based laptop",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
	DMI_MATCH(DMI_PRODUCT_VERSION, "PS5"),
	},
	},
	{
	.ident = "Toshiba PSM4 based laptop",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
	DMI_MATCH(DMI_PRODUCT_VERSION, "PSM4"),
	},
	},
	{
	.ident = "Toshiba A40 based laptop",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
	DMI_MATCH(DMI_PRODUCT_VERSION, "PSA40U"),
	},
	},
	{ }
	};

	static void pci_pre_fixup_toshiba_ohci1394(struct pci_dev *dev)
	{
	if (!dmi_check_system(toshiba_ohci1394_dmi_table))
	return; /* only applies to certain Toshibas (so far) */

	dev->current_state = PCI_D3cold;
	pci_read_config_word(dev, PCI_CACHE_LINE_SIZE, &toshiba_line_size);
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TI, 0x8032,
	pci_pre_fixup_toshiba_ohci1394);

	static void pci_post_fixup_toshiba_ohci1394(struct pci_dev *dev)
	{
	if (!dmi_check_system(toshiba_ohci1394_dmi_table))
	return; /* only applies to certain Toshibas (so far) */

	/* Restore config space on Toshiba laptops */
	pci_write_config_word(dev, PCI_CACHE_LINE_SIZE, toshiba_line_size);
	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, (u8 *)&dev->irq);
	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
	pci_resource_start(dev, 0));
	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
	pci_resource_start(dev, 1));
	}
	DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_TI, 0x8032,
	pci_post_fixup_toshiba_ohci1394);


	/*
	* Prevent the BIOS trapping accesses to the Cyrix CS5530A video device
	* configuration space.
	*/
	static void pci_early_fixup_cyrix_5530(struct pci_dev *dev)
	{
	u8 r;
	/* clear 'F4 Video Configuration Trap' bit */
	pci_read_config_byte(dev, 0x42, &r);
	r &= 0xfd;
	pci_write_config_byte(dev, 0x42, r);
	}
	DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY,
	pci_early_fixup_cyrix_5530);
	DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY,
	pci_early_fixup_cyrix_5530);

	/*
	* Siemens Nixdorf AG FSC Multiprocessor Interrupt Controller:
	* prevent update of the BAR0, which doesn't look like a normal BAR.
	*/
	static void pci_siemens_interrupt_controller(struct pci_dev *dev)
	{
	dev->resource[0].flags \|= IORESOURCE_PCI_FIXED;
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SIEMENS, 0x0015,
	pci_siemens_interrupt_controller);

	/*
	* SB600: Disable BAR1 on device 14.0 to avoid HPET resources from
	* confusing the PCI engine:
	*/
	static void sb600_disable_hpet_bar(struct pci_dev *dev)
	{
	u8 val;

	/*
	* The SB600 and SB700 both share the same device
	* ID, but the PM register 0x55 does something different
	* for the SB700, so make sure we are dealing with the
	* SB600 before touching the bit:
	*/

	pci_read_config_byte(dev, 0x08, &val);

	if (val < 0x2F) {
	outb(0x55, 0xCD6);
	val = inb(0xCD7);

	/* Set bit 7 in PM register 0x55 */
	outb(0x55, 0xCD6);
	outb(val \| 0x80, 0xCD7);
	}
	}
	DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar);

	/*
	* Twinhead H12Y needs us to block out a region otherwise we map devices
	* there and any access kills the box.
	*
	* See: https://bugzilla.kernel.org/show_bug.cgi?id=10231
	*
	* Match off the LPC and svid/sdid (older kernels lose the bridge subvendor)
	*/
	static void twinhead_reserve_killing_zone(struct pci_dev *dev)
	{
	if (dev->subsystem_vendor == 0x14FF && dev->subsystem_device == 0xA003) {
	pr_info("Reserving memory on Twinhead H12Y\n");
	request_mem_region(0xFFB00000, 0x100000, "twinhead");
	}
	}
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone);