arch/x86/kernel/quirks.c - linux - Git at Google

 /*
  * This file contains work-arounds for x86 and x86_64 platform bugs.
  */
 #include <linux/pci.h>
 #include <linux/irq.h>

 #include <asm/hpet.h>

 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)

 static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
 {
 	u8 config, rev;
 	u16 word;

 	/* BIOS may enable hardware IRQ balancing for
 	 * E7520/E7320/E7525(revision ID 0x9 and below)
 	 * based platforms.
 	 * Disable SW irqbalance/affinity on those platforms.
 	 */
 	pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
 	if (rev > 0x9)
 		return;

 	/* enable access to config space*/
 	pci_read_config_byte(dev, 0xf4, &config);
 	pci_write_config_byte(dev, 0xf4, config|0x2);

 	/*
 	 * read xTPR register.  We may not have a pci_dev for device 8
 	 * because it might be hidden until the above write.
 	 */
 	pci_bus_read_config_word(dev->bus, PCI_DEVFN(8, 0), 0x4c, &word);

 	if (!(word & (1 << 13))) {
 		dev_info(&dev->dev, "Intel E7520/7320/7525 detected; "
 			"disabling irq balancing and affinity\n");
 #ifdef CONFIG_IRQBALANCE
 		irqbalance_disable("");
 #endif
 		noirqdebug_setup("");
 #ifdef CONFIG_PROC_FS
 		no_irq_affinity = 1;
 #endif
 	}

 	/* put back the original value for config space*/
 	if (!(config & 0x2))
 		pci_write_config_byte(dev, 0xf4, config);
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH,
 			quirk_intel_irqbalance);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH,
 			quirk_intel_irqbalance);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH,
 			quirk_intel_irqbalance);
 #endif

 #if defined(CONFIG_HPET_TIMER)
 unsigned long force_hpet_address;

 static enum {
 	NONE_FORCE_HPET_RESUME,
 	OLD_ICH_FORCE_HPET_RESUME,
 	ICH_FORCE_HPET_RESUME,
 	VT8237_FORCE_HPET_RESUME,
 	NVIDIA_FORCE_HPET_RESUME,
 } force_hpet_resume_type;

 static void __iomem *rcba_base;

 static void ich_force_hpet_resume(void)
 {
 	u32 val;

 	if (!force_hpet_address)
 		return;

 	if (rcba_base == NULL)
 		BUG();

 	/* read the Function Disable register, dword mode only */
 	val = readl(rcba_base + 0x3404);
 	if (!(val & 0x80)) {
 		/* HPET disabled in HPTC. Trying to enable */
 		writel(val | 0x80, rcba_base + 0x3404);
 	}

 	val = readl(rcba_base + 0x3404);
 	if (!(val & 0x80))
 		BUG();
 	else
 		printk(KERN_DEBUG "Force enabled HPET at resume\n");

 	return;
 }

 static void ich_force_enable_hpet(struct pci_dev *dev)
 {
 	u32 val;
 	u32 uninitialized_var(rcba);
 	int err = 0;

 	if (hpet_address || force_hpet_address)
 		return;

 	pci_read_config_dword(dev, 0xF0, &rcba);
 	rcba &= 0xFFFFC000;
 	if (rcba == 0) {
 		dev_printk(KERN_DEBUG, &dev->dev, "RCBA disabled; "
 			"cannot force enable HPET\n");
 		return;
 	}

 	/* use bits 31:14, 16 kB aligned */
 	rcba_base = ioremap_nocache(rcba, 0x4000);
 	if (rcba_base == NULL) {
 		dev_printk(KERN_DEBUG, &dev->dev, "ioremap failed; "
 			"cannot force enable HPET\n");
 		return;
 	}

 	/* read the Function Disable register, dword mode only */
 	val = readl(rcba_base + 0x3404);

 	if (val & 0x80) {
 		/* HPET is enabled in HPTC. Just not reported by BIOS */
 		val = val & 0x3;
 		force_hpet_address = 0xFED00000 | (val << 12);
 		dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
 			"0x%lx\n", force_hpet_address);
 		iounmap(rcba_base);
 		return;
 	}

 	/* HPET disabled in HPTC. Trying to enable */
 	writel(val | 0x80, rcba_base + 0x3404);

 	val = readl(rcba_base + 0x3404);
 	if (!(val & 0x80)) {
 		err = 1;
 	} else {
 		val = val & 0x3;
 		force_hpet_address = 0xFED00000 | (val << 12);
 	}

 	if (err) {
 		force_hpet_address = 0;
 		iounmap(rcba_base);
 		dev_printk(KERN_DEBUG, &dev->dev,
 			"Failed to force enable HPET\n");
 	} else {
 		force_hpet_resume_type = ICH_FORCE_HPET_RESUME;
 		dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
 			"0x%lx\n", force_hpet_address);
 	}
 }

 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
 			 ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,
 			 ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0,
 			 ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1,
 			 ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31,
 			 ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_1,
 			 ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_7,
 			 ich_force_enable_hpet);


 static struct pci_dev *cached_dev;

 static void old_ich_force_hpet_resume(void)
 {
 	u32 val;
 	u32 uninitialized_var(gen_cntl);

 	if (!force_hpet_address || !cached_dev)
 		return;

 	pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
 	gen_cntl &= (~(0x7 << 15));
 	gen_cntl |= (0x4 << 15);

 	pci_write_config_dword(cached_dev, 0xD0, gen_cntl);
 	pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
 	val = gen_cntl >> 15;
 	val &= 0x7;
 	if (val == 0x4)
 		printk(KERN_DEBUG "Force enabled HPET at resume\n");
 	else
 		BUG();
 }

 static void old_ich_force_enable_hpet(struct pci_dev *dev)
 {
 	u32 val;
 	u32 uninitialized_var(gen_cntl);

 	if (hpet_address || force_hpet_address)
 		return;

 	pci_read_config_dword(dev, 0xD0, &gen_cntl);
 	/*
 	 * Bit 17 is HPET enable bit.
 	 * Bit 16:15 control the HPET base address.
 	 */
 	val = gen_cntl >> 15;
 	val &= 0x7;
 	if (val & 0x4) {
 		val &= 0x3;
 		force_hpet_address = 0xFED00000 | (val << 12);
 		dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
 			force_hpet_address);
 		return;
 	}

 	/*
 	 * HPET is disabled. Trying enabling at FED00000 and check
 	 * whether it sticks
 	 */
 	gen_cntl &= (~(0x7 << 15));
 	gen_cntl |= (0x4 << 15);
 	pci_write_config_dword(dev, 0xD0, gen_cntl);

 	pci_read_config_dword(dev, 0xD0, &gen_cntl);

 	val = gen_cntl >> 15;
 	val &= 0x7;
 	if (val & 0x4) {
 		/* HPET is enabled in HPTC. Just not reported by BIOS */
 		val &= 0x3;
 		force_hpet_address = 0xFED00000 | (val << 12);
 		dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
 			"0x%lx\n", force_hpet_address);
 		cached_dev = dev;
 		force_hpet_resume_type = OLD_ICH_FORCE_HPET_RESUME;
 		return;
 	}

 	dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
 }

 /*
  * Undocumented chipset features. Make sure that the user enforced
  * this.
  */
 static void old_ich_force_enable_hpet_user(struct pci_dev *dev)
 {
 	if (hpet_force_user)
 		old_ich_force_enable_hpet(dev);
 }

 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
 			 old_ich_force_enable_hpet_user);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12,
 			 old_ich_force_enable_hpet_user);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
 			 old_ich_force_enable_hpet_user);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12,
 			 old_ich_force_enable_hpet_user);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
 			 old_ich_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12,
 			 old_ich_force_enable_hpet);


 static void vt8237_force_hpet_resume(void)
 {
 	u32 val;

 	if (!force_hpet_address || !cached_dev)
 		return;

 	val = 0xfed00000 | 0x80;
 	pci_write_config_dword(cached_dev, 0x68, val);

 	pci_read_config_dword(cached_dev, 0x68, &val);
 	if (val & 0x80)
 		printk(KERN_DEBUG "Force enabled HPET at resume\n");
 	else
 		BUG();
 }

 static void vt8237_force_enable_hpet(struct pci_dev *dev)
 {
 	u32 uninitialized_var(val);

 	if (!hpet_force_user || hpet_address || force_hpet_address)
 		return;

 	pci_read_config_dword(dev, 0x68, &val);
 	/*
 	 * Bit 7 is HPET enable bit.
 	 * Bit 31:10 is HPET base address (contrary to what datasheet claims)
 	 */
 	if (val & 0x80) {
 		force_hpet_address = (val & ~0x3ff);
 		dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
 			force_hpet_address);
 		return;
 	}

 	/*
 	 * HPET is disabled. Trying enabling at FED00000 and check
 	 * whether it sticks
 	 */
 	val = 0xfed00000 | 0x80;
 	pci_write_config_dword(dev, 0x68, val);

 	pci_read_config_dword(dev, 0x68, &val);
 	if (val & 0x80) {
 		force_hpet_address = (val & ~0x3ff);
 		dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
 			"0x%lx\n", force_hpet_address);
 		cached_dev = dev;
 		force_hpet_resume_type = VT8237_FORCE_HPET_RESUME;
 		return;
 	}

 	dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
 }

 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
 			 vt8237_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
 			 vt8237_force_enable_hpet);

 /*
  * Undocumented chipset feature taken from LinuxBIOS.
  */
 static void nvidia_force_hpet_resume(void)
 {
 	pci_write_config_dword(cached_dev, 0x44, 0xfed00001);
 	printk(KERN_DEBUG "Force enabled HPET at resume\n");
 }

 static void nvidia_force_enable_hpet(struct pci_dev *dev)
 {
 	u32 uninitialized_var(val);

 	if (!hpet_force_user || hpet_address || force_hpet_address)
 		return;

 	pci_write_config_dword(dev, 0x44, 0xfed00001);
 	pci_read_config_dword(dev, 0x44, &val);
 	force_hpet_address = val & 0xfffffffe;
 	force_hpet_resume_type = NVIDIA_FORCE_HPET_RESUME;
 	dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
 		force_hpet_address);
 	cached_dev = dev;
 	return;
 }

 /* ISA Bridges */
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0050,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0051,
 			nvidia_force_enable_hpet);

 /* LPC bridges */
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0260,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0360,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0361,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0362,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0363,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0364,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0365,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0366,
 			nvidia_force_enable_hpet);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0367,
 			nvidia_force_enable_hpet);

 void force_hpet_resume(void)
 {
 	switch (force_hpet_resume_type) {
 	case ICH_FORCE_HPET_RESUME:
 		ich_force_hpet_resume();
 		return;
 	case OLD_ICH_FORCE_HPET_RESUME:
 		old_ich_force_hpet_resume();
 		return;
 	case VT8237_FORCE_HPET_RESUME:
 		vt8237_force_hpet_resume();
 		return;
 	case NVIDIA_FORCE_HPET_RESUME:
 		nvidia_force_hpet_resume();
 		return;
 	default:
 		break;
 	}
 }

 #endif
	/*
	* This file contains work-arounds for x86 and x86_64 platform bugs.
	*/
	#include <linux/pci.h>
	#include <linux/irq.h>

	#include <asm/hpet.h>

	#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)

	static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
	{
	u8 config, rev;
	u16 word;

	/* BIOS may enable hardware IRQ balancing for
	* E7520/E7320/E7525(revision ID 0x9 and below)
	* based platforms.
	* Disable SW irqbalance/affinity on those platforms.
	*/
	pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
	if (rev > 0x9)
	return;

	/* enable access to config space*/
	pci_read_config_byte(dev, 0xf4, &config);
	pci_write_config_byte(dev, 0xf4, config\|0x2);

	/*
	* read xTPR register. We may not have a pci_dev for device 8
	* because it might be hidden until the above write.
	*/
	pci_bus_read_config_word(dev->bus, PCI_DEVFN(8, 0), 0x4c, &word);

	if (!(word & (1 << 13))) {
	dev_info(&dev->dev, "Intel E7520/7320/7525 detected; "
	"disabling irq balancing and affinity\n");
	#ifdef CONFIG_IRQBALANCE
	irqbalance_disable("");
	#endif
	noirqdebug_setup("");
	#ifdef CONFIG_PROC_FS
	no_irq_affinity = 1;
	#endif
	}

	/* put back the original value for config space*/
	if (!(config & 0x2))
	pci_write_config_byte(dev, 0xf4, config);
	}
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH,
	quirk_intel_irqbalance);
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH,
	quirk_intel_irqbalance);
	DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH,
	quirk_intel_irqbalance);
	#endif

	#if defined(CONFIG_HPET_TIMER)
	unsigned long force_hpet_address;

	static enum {
	NONE_FORCE_HPET_RESUME,
	OLD_ICH_FORCE_HPET_RESUME,
	ICH_FORCE_HPET_RESUME,
	VT8237_FORCE_HPET_RESUME,
	NVIDIA_FORCE_HPET_RESUME,
	} force_hpet_resume_type;

	static void __iomem *rcba_base;

	static void ich_force_hpet_resume(void)
	{
	u32 val;

	if (!force_hpet_address)
	return;

	if (rcba_base == NULL)
	BUG();

	/* read the Function Disable register, dword mode only */
	val = readl(rcba_base + 0x3404);
	if (!(val & 0x80)) {
	/* HPET disabled in HPTC. Trying to enable */
	writel(val \| 0x80, rcba_base + 0x3404);
	}

	val = readl(rcba_base + 0x3404);
	if (!(val & 0x80))
	BUG();
	else
	printk(KERN_DEBUG "Force enabled HPET at resume\n");

	return;
	}

	static void ich_force_enable_hpet(struct pci_dev *dev)
	{
	u32 val;
	u32 uninitialized_var(rcba);
	int err = 0;

	if (hpet_address \|\| force_hpet_address)
	return;

	pci_read_config_dword(dev, 0xF0, &rcba);
	rcba &= 0xFFFFC000;
	if (rcba == 0) {
	dev_printk(KERN_DEBUG, &dev->dev, "RCBA disabled; "
	"cannot force enable HPET\n");
	return;
	}

	/* use bits 31:14, 16 kB aligned */
	rcba_base = ioremap_nocache(rcba, 0x4000);
	if (rcba_base == NULL) {
	dev_printk(KERN_DEBUG, &dev->dev, "ioremap failed; "
	"cannot force enable HPET\n");
	return;
	}

	/* read the Function Disable register, dword mode only */
	val = readl(rcba_base + 0x3404);

	if (val & 0x80) {
	/* HPET is enabled in HPTC. Just not reported by BIOS */
	val = val & 0x3;
	force_hpet_address = 0xFED00000 \| (val << 12);
	dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
	"0x%lx\n", force_hpet_address);
	iounmap(rcba_base);
	return;
	}

	/* HPET disabled in HPTC. Trying to enable */
	writel(val \| 0x80, rcba_base + 0x3404);

	val = readl(rcba_base + 0x3404);
	if (!(val & 0x80)) {
	err = 1;
	} else {
	val = val & 0x3;
	force_hpet_address = 0xFED00000 \| (val << 12);
	}

	if (err) {
	force_hpet_address = 0;
	iounmap(rcba_base);
	dev_printk(KERN_DEBUG, &dev->dev,
	"Failed to force enable HPET\n");
	} else {
	force_hpet_resume_type = ICH_FORCE_HPET_RESUME;
	dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
	"0x%lx\n", force_hpet_address);
	}
	}

	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
	ich_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,
	ich_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0,
	ich_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1,
	ich_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31,
	ich_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_1,
	ich_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_7,
	ich_force_enable_hpet);


	static struct pci_dev *cached_dev;

	static void old_ich_force_hpet_resume(void)
	{
	u32 val;
	u32 uninitialized_var(gen_cntl);

	if (!force_hpet_address \|\| !cached_dev)
	return;

	pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
	gen_cntl &= (~(0x7 << 15));
	gen_cntl \|= (0x4 << 15);

	pci_write_config_dword(cached_dev, 0xD0, gen_cntl);
	pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
	val = gen_cntl >> 15;
	val &= 0x7;
	if (val == 0x4)
	printk(KERN_DEBUG "Force enabled HPET at resume\n");
	else
	BUG();
	}

	static void old_ich_force_enable_hpet(struct pci_dev *dev)
	{
	u32 val;
	u32 uninitialized_var(gen_cntl);

	if (hpet_address \|\| force_hpet_address)
	return;

	pci_read_config_dword(dev, 0xD0, &gen_cntl);
	/*
	* Bit 17 is HPET enable bit.
	* Bit 16:15 control the HPET base address.
	*/
	val = gen_cntl >> 15;
	val &= 0x7;
	if (val & 0x4) {
	val &= 0x3;
	force_hpet_address = 0xFED00000 \| (val << 12);
	dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
	force_hpet_address);
	return;
	}

	/*
	* HPET is disabled. Trying enabling at FED00000 and check
	* whether it sticks
	*/
	gen_cntl &= (~(0x7 << 15));
	gen_cntl \|= (0x4 << 15);
	pci_write_config_dword(dev, 0xD0, gen_cntl);

	pci_read_config_dword(dev, 0xD0, &gen_cntl);

	val = gen_cntl >> 15;
	val &= 0x7;
	if (val & 0x4) {
	/* HPET is enabled in HPTC. Just not reported by BIOS */
	val &= 0x3;
	force_hpet_address = 0xFED00000 \| (val << 12);
	dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
	"0x%lx\n", force_hpet_address);
	cached_dev = dev;
	force_hpet_resume_type = OLD_ICH_FORCE_HPET_RESUME;
	return;
	}

	dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
	}

	/*
	* Undocumented chipset features. Make sure that the user enforced
	* this.
	*/
	static void old_ich_force_enable_hpet_user(struct pci_dev *dev)
	{
	if (hpet_force_user)
	old_ich_force_enable_hpet(dev);
	}

	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
	old_ich_force_enable_hpet_user);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12,
	old_ich_force_enable_hpet_user);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
	old_ich_force_enable_hpet_user);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12,
	old_ich_force_enable_hpet_user);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
	old_ich_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12,
	old_ich_force_enable_hpet);


	static void vt8237_force_hpet_resume(void)
	{
	u32 val;

	if (!force_hpet_address \|\| !cached_dev)
	return;

	val = 0xfed00000 \| 0x80;
	pci_write_config_dword(cached_dev, 0x68, val);

	pci_read_config_dword(cached_dev, 0x68, &val);
	if (val & 0x80)
	printk(KERN_DEBUG "Force enabled HPET at resume\n");
	else
	BUG();
	}

	static void vt8237_force_enable_hpet(struct pci_dev *dev)
	{
	u32 uninitialized_var(val);

	if (!hpet_force_user \|\| hpet_address \|\| force_hpet_address)
	return;

	pci_read_config_dword(dev, 0x68, &val);
	/*
	* Bit 7 is HPET enable bit.
	* Bit 31:10 is HPET base address (contrary to what datasheet claims)
	*/
	if (val & 0x80) {
	force_hpet_address = (val & ~0x3ff);
	dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
	force_hpet_address);
	return;
	}

	/*
	* HPET is disabled. Trying enabling at FED00000 and check
	* whether it sticks
	*/
	val = 0xfed00000 \| 0x80;
	pci_write_config_dword(dev, 0x68, val);

	pci_read_config_dword(dev, 0x68, &val);
	if (val & 0x80) {
	force_hpet_address = (val & ~0x3ff);
	dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
	"0x%lx\n", force_hpet_address);
	cached_dev = dev;
	force_hpet_resume_type = VT8237_FORCE_HPET_RESUME;
	return;
	}

	dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
	}

	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
	vt8237_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
	vt8237_force_enable_hpet);

	/*
	* Undocumented chipset feature taken from LinuxBIOS.
	*/
	static void nvidia_force_hpet_resume(void)
	{
	pci_write_config_dword(cached_dev, 0x44, 0xfed00001);
	printk(KERN_DEBUG "Force enabled HPET at resume\n");
	}

	static void nvidia_force_enable_hpet(struct pci_dev *dev)
	{
	u32 uninitialized_var(val);

	if (!hpet_force_user \|\| hpet_address \|\| force_hpet_address)
	return;

	pci_write_config_dword(dev, 0x44, 0xfed00001);
	pci_read_config_dword(dev, 0x44, &val);
	force_hpet_address = val & 0xfffffffe;
	force_hpet_resume_type = NVIDIA_FORCE_HPET_RESUME;
	dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
	force_hpet_address);
	cached_dev = dev;
	return;
	}

	/* ISA Bridges */
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0050,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0051,
	nvidia_force_enable_hpet);

	/* LPC bridges */
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0260,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0360,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0361,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0362,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0363,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0364,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0365,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0366,
	nvidia_force_enable_hpet);
	DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0367,
	nvidia_force_enable_hpet);

	void force_hpet_resume(void)
	{
	switch (force_hpet_resume_type) {
	case ICH_FORCE_HPET_RESUME:
	ich_force_hpet_resume();
	return;
	case OLD_ICH_FORCE_HPET_RESUME:
	old_ich_force_hpet_resume();
	return;
	case VT8237_FORCE_HPET_RESUME:
	vt8237_force_hpet_resume();
	return;
	case NVIDIA_FORCE_HPET_RESUME:
	nvidia_force_hpet_resume();
	return;
	default:
	break;
	}
	}

	#endif