Re: Fwd: hpet patches

[Jon Smirl <jonsmirl@gmail.com>]

On 6/15/05, Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com> wrote:
> The specification for ICH5 has the details about this address
> http://www.intel.com/design/chipsets/datashts/25251601.pdf (Chapter 17).
> We need to look at specific device address to figure out the HPET base
> address in this case.

The ICH5 fix up needs to look something like this:
PCI_DEVICE_ID_INTEL_82801EB_0 is the PCI ID for the LPC device.

ACPI_FIXUP(INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, hpet_ich5_fixup)
hpet_ich5_fixup()
{
     pci_bios_find_device(PCI_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, ...)
     pci_bios_read(device, GENERAL_CONTROL_REGISTER, ..)
     Check bit 17 and see if it is enabled
     use bit 15:16 to set hpet_address to one of the four addresses
}

It would be more complicated to try and turn it on if it is turned
off. Mine is turned on at boot even though it has no ACPI entry. A
routine like this should at least get things started.

-- 
Jon Smirl
jonsmirl@gmail.com