1 files changed, 90 insertions, 0 deletions
diff --git a/src/mainboard/google/kahlee/acpi/thermal.asl b/src/mainboard/google/kahlee/acpi/thermal.asl
new file mode 100644
index 0000000000..86f8758892
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+++ b/src/mainboard/google/kahlee/acpi/thermal.asl
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+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google Inc.
+ *
+ * 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.
+ */
+
+#include <variant/thermal.h>
+
+/* Thermal Zone */
+
+Scope (\_TZ)
+{
+	ThermalZone (THRM)
+	{
+		/* Thermal constants for passive cooling */
+		Name (_TC1, 0x02)
+		Name (_TC2, 0x05)
+
+		/* 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 temperature from EC in deci-kelvin */
+			Store (\_SB.PCI0.LPCB.EC0.TSRD (TMPS), Local0)
+
+			/* Critical temperature in deci-kelvin */
+			Store (CTOK (\TCRT), Local1)
+
+			If (LGreaterEqual (Local0, Local1)) {
+				Store ("CRITICAL TEMPERATURE", Debug)
+				Store (Local0, Debug)
+
+				/* Wait 1 second for EC to re-poll */
+				Sleep (1000)
+
+				/* Re-read temperature from EC */
+				Store (\_SB.PCI0.LPCB.EC0.TSRD (TMPS), Local0)
+
+				Store ("RE-READ TEMPERATURE", Debug)
+				Store (Local0, Debug)
+			}
+
+			Return (Local0)
+		}
+
+		/* No active fan control (_ACx) on Kahlee */
+	}
+}