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x86: Force enable HPET for CK804 (nForce 4) chipsets 

This patch adds a quirk from LinuxBIOS to force enable HPET on
the nVidia CK804 (nForce 4) chipset.

This quirk can very likely support more than just nForce 4
(LinuxBIOS use the same code for nForce 5), and possibly nForce 3,
but I don't have those chipsets, so cannot add and test them.

Tested on an Abit KN9 (CK804).

Signed-off-by: Carlos Corbacho <cathectic@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

 Documentation/kernel-parameters.txt |    3 +-
 arch/x86/kernel/quirks.c            |   37 +++++++++++++++++++++++++++++++++++-
 2 files changed, 38 insertions(+), 2 deletions(-)
This commit is contained in:
Carlos Corbacho 2007-10-19 18:51:27 +01:00 committed by Thomas Gleixner
parent fa76dab935
commit d79a5f80dc
2 changed files with 38 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/kernel-parameters.txt
View File

@ -422,7 +422,8 @@ and is between 256 and 4096 characters. It is defined in the file
hpet= [X86-32,HPET] option to control HPET usage
Format: { enable (default) | disable | force }
disable: disable HPET and use PIT instead
force: allow force enabled of undocumented chips (ICH4, VIA)
force: allow force enabled of undocumented chips (ICH4,
VIA, nVidia)
com20020= [HW,NET] ARCnet - COM20020 chipset
Format:

37
arch/x86/kernel/quirks.c
View File

@ -60,7 +60,8 @@ static enum {
NONE_FORCE_HPET_RESUME,
OLD_ICH_FORCE_HPET_RESUME,
ICH_FORCE_HPET_RESUME,
VT8237_FORCE_HPET_RESUME
VT8237_FORCE_HPET_RESUME,
NVIDIA_FORCE_HPET_RESUME,
} force_hpet_resume_type;
static void __iomem *rcba_base;
@ -321,6 +322,37 @@ 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);
/*
* 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;
printk(KERN_DEBUG "Force enabled HPET at base address 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);
void force_hpet_resume(void)
{
@ -334,6 +366,9 @@ void force_hpet_resume(void)
case VT8237_FORCE_HPET_RESUME:
return vt8237_force_hpet_resume();
case NVIDIA_FORCE_HPET_RESUME:
return nvidia_force_hpet_resume();
default:
break;
}