From: Jon Smirl <jonsmirl@gmail.com>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Cc: Bob Picco <bob.picco@hp.com>, Andrew Morton <akpm@osdl.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: Fwd: hpet patches
Date: Wed, 15 Jun 2005 13:54:16 -0400 [thread overview]
Message-ID: <9e47339105061510547ea7d2f0@mail.gmail.com> (raw)
In-Reply-To: <88056F38E9E48644A0F562A38C64FB6004FB6BED@scsmsx403.amr.corp.intel.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
next prev parent reply other threads:[~2005-06-15 17:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-15 17:15 Fwd: hpet patches Pallipadi, Venkatesh
2005-06-15 17:54 ` Jon Smirl [this message]
2005-06-15 18:11 ` Lee Revell
2005-06-16 14:00 ` Vitezslav Samel
-- strict thread matches above, loose matches on Subject: below --
2005-06-14 23:16 Pallipadi, Venkatesh
2005-06-14 23:36 ` Jon Smirl
2005-06-15 0:51 ` Andi Kleen
2005-06-14 22:37 Pallipadi, Venkatesh
2005-06-14 23:11 ` Jon Smirl
[not found] <88056F38E9E48644A0F562A38C64FB6004F77C29@scsmsx403.amr.corp.intel.com>
[not found] ` <9e473391050614092661d665ee@mail.gmail.com>
[not found] ` <20050614164605.GQ3728@localhost.localdomain>
2005-06-14 17:50 ` Jon Smirl
2005-06-14 18:38 ` Bob Picco
2005-06-14 21:51 ` Jon Smirl
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