diff options
author | Stefan Reinauer <reinauer@chromium.org> | 2012-12-11 16:00:47 -0800 |
---|---|---|
committer | Ronald G. Minnich <rminnich@gmail.com> | 2012-12-12 06:03:06 +0100 |
commit | a7198b34ccf120df2a9e5b9f104812e96916ad08 (patch) | |
tree | e2d6f704f4f9d1a5b1060febe4c9463d8811fc24 /src/mainboard/google/parrot/acpi/thermal.asl | |
parent | 0e81b62638bbc7ee1731034dd041f9756a5bd0fb (diff) |
Add support for Google Parrot Chromebook
AKA Acer C7 Chromebook
See http://www.google.com/intl/en/chrome/devices/acer-c7-chromebook.html
for more information. Thank you to Sage Electronic Engineering, LLC for
making this possible! http://www.se-eng.com/
Change-Id: Ic4e4d50045a82cbb82e1dea3cd5a04525a648612
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/2026
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/mainboard/google/parrot/acpi/thermal.asl')
-rw-r--r-- | src/mainboard/google/parrot/acpi/thermal.asl | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/mainboard/google/parrot/acpi/thermal.asl b/src/mainboard/google/parrot/acpi/thermal.asl new file mode 100644 index 0000000000..440612c54a --- /dev/null +++ b/src/mainboard/google/parrot/acpi/thermal.asl @@ -0,0 +1,98 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 The Chromium OS Authors. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +// Thermal Zone + +Scope (\_TZ) +{ + ThermalZone (THRM) + { + Name (_TC1, 0x02) + Name (_TC2, 0x05) + + // Ignore critical temps for the first few reads + // at boot to prevent unexpected shutdown + Name (IRDC, 4) + Name (CRDC, 0) + + // Thermal zone polling frequency: 10 seconds + Name (_TZP, 100) + + // Thermal sampling period for passive cooling: 2 seconds + Name (_TSP, 20) + + // Convert from Degrees C to 1/10 Kelvin for ACPI + Method (CTOK, 1) { + // 10th of Degrees C + Multiply (Arg0, 10, Local0) + + // Convert to Kelvin + Add (Local0, 2732, Local0) + + Return (Local0) + } + + // Threshold for OS to shutdown + Method (_CRT, 0, Serialized) + { + Return (CTOK (\TCRT)) + } + + // Threshold for passive cooling + Method (_PSV, 0, Serialized) + { + Return (CTOK (\TPSV)) + } + + // Processors used for passive cooling + Method (_PSL, 0, Serialized) + { + Return (\PPKG ()) + } + + Method (_TMP, 0, Serialized) + { + // Get CPU Temperature from the Embedded Controller + Store (\_SB.PCI0.LPCB.EC0.CTMP, Local0) + + // Re-read from EC if the temperature is very high to + // avoid OS shutdown if we got a bad reading. + If (LGreaterEqual (Local0, \TCRT)) { + Store (\_SB.PCI0.LPCB.EC0.CTMP, Local0) + If (LGreaterEqual (Local0, \TCRT)) { + // Check if this is an early read + If (LLess (CRDC, IRDC)) { + Store (0, Local0) + } + } + } + + // Keep track of first few reads by the OS + If (LLess (CRDC, IRDC)) { + Increment (CRDC) + } + + Return (CTOK (Local0)) + } + +// The EC does all fan control. The is no Active Cooling Fan control (_ACx). + + } +} + |