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Message-ID: <9e47339105061510547ea7d2f0@mail.gmail.com>
Date: Wed, 15 Jun 2005 13:54:16 -0400
From: Jon Smirl <jonsmirl@gmail.com>
Reply-To: Jon Smirl <jonsmirl@gmail.com>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Subject: Re: Fwd: hpet patches
Cc: Bob Picco <bob.picco@hp.com>, Andrew Morton <akpm@osdl.org>,
       lkml <linux-kernel@vger.kernel.org>
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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