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x86: enable hpet=force for AMD SB400 

Add quirk to allow forced usage of HPET on ATI SB400.
I stumbled over machines where HPET is enabled but not reported
by BIOS. This patch configures the HPET base address and makes
it known to the OS.

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andreas Herrmann 2008-05-09 11:49:11 +02:00 committed by Ingo Molnar
parent 6fd592daae
commit e8aa4667ba
1 changed files with 29 additions and 0 deletions
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29
arch/x86/kernel/quirks.c
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@ -65,6 +65,7 @@ static enum {
ICH_FORCE_HPET_RESUME,
VT8237_FORCE_HPET_RESUME,
NVIDIA_FORCE_HPET_RESUME,
ATI_FORCE_HPET_RESUME,
} force_hpet_resume_type;
static void __iomem *rcba_base;
@ -330,6 +331,31 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
vt8237_force_enable_hpet);
static void ati_force_hpet_resume(void)
{
pci_write_config_dword(cached_dev, 0x14, 0xfed00000);
printk(KERN_DEBUG "Force enabled HPET at resume\n");
}
static void ati_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, 0x14, 0xfed00000);
pci_read_config_dword(dev, 0x14, &val);
force_hpet_address = val;
force_hpet_resume_type = ATI_FORCE_HPET_RESUME;
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
force_hpet_address);
cached_dev = dev;
return;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
ati_force_enable_hpet);
/*
* Undocumented chipset feature taken from LinuxBIOS.
*/
@ -397,6 +423,9 @@ void force_hpet_resume(void)
case NVIDIA_FORCE_HPET_RESUME:
nvidia_force_hpet_resume();
return;
case ATI_FORCE_HPET_RESUME:
ati_force_hpet_resume();
return;
default:
break;
}