[coreboot-gerrit] New patch to review for coreboot: amd/fam10: Add k10temp ACPI thermal zone mixin.

[Tobias Diedrich]

Tobias Diedrich ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/10617

-gerrit

commit b352a4efb3e822d5403d7af8cd6bd2ca3d4a68ac
Author: Tobias Diedrich 
Date:   Sun Jun 21 18:15:40 2015 +0200

amd/fam10: Add k10temp ACPI thermal zone mixin.

This ACPI thermal zone is applicable to AMD family 10 to 14 (and some
    15) CPUs.

It should not be used on boards for which errata 319 (The thermal sensor
    of Socket F/AM2+ processors may be unreliable) is applicable. AM3 and
    later should be fine.

Derived from src/northbridge/amd/amdk8/thermal_mixin.asl

Change-Id: Id036cbf4cd717c3320a720edc452945df2b5e072
    Signed-off-by: 
---
 src/northbridge/amd/amdfam10/thermal_mixin.asl | 89 ++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/src/northbridge/amd/amdfam10/thermal_mixin.asl b/src/northbridge/amd/amdfam10/thermal_mixin.asl
new file mode 100644
index 0000000..3bd7e40
--- /dev/null
+++ b/src/northbridge/amd/amdfam10/thermal_mixin.asl
@@ -0,0 +1,89 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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.
+ */
+
+/*
+ * Include this file into a mainboard DSDT inside the PCI device
+ * "Northbridge Miscellaneous Control (Northbridge function 3)" and it
+ * will expose the temperature sensor of the processor as a thermal
+ * zone.
+ *
+ * Families 10 through 14 and some family 15 CPUs are supported.
+ *
+ * If, for example, the NB Misc. Control device is on 0:18.3, include
+ * the following:
+ *
+ * Scope (_SB.PCI0) {
+ *   Device (K10M) {
+ *     Name (_ADR, 0x00180003)
+ *     #include <northbridge/amd/amdfam10/thermal_mixin.asl>
+ *   }
+ * }
+ *
+ * Do not include this if the board is affected by erratum 319 as the
+ * thermal sensor of Socket F/AM2+ processors may be unreliable.
+ * (Erratum 319 affects AM2+ boards, AM3 and later should be fine)
+ */
+
+#ifndef K10TEMP_HOT_OFFSET
+# define K10TEMP_HOT_OFFSET	100
+#endif
+
+#define K10TEMP_KELVIN_OFFSET	2732
+#define K10TEMP_TLIMIT_OFFSET	520
+
+OperationRegion (TCFG, PCI_Config, 0x64, 0x4)
+Field (TCFG, ByteAcc, NoLock, Preserve) {
+	HTCE, 1, /* Hardware thermal control enable */
+	, 15,
+	TLMT, 7, /* (LimitTmp - 52) / 0.5 */
+	, 9,
+}
+
+OperationRegion (TCTL, PCI_Config, 0xa4, 0x4)
+Field (TCTL, ByteAcc, NoLock, Preserve) {
+	, 21,
+	TNOW, 11, /* CurTmp / 0.125 */
+}
+
+ThermalZone (TZ00) {
+	Name (_HID, EisaId ("PNP0C11"))
+	Name (_STR, Unicode ("AMD CPU Core Thermal Sensor"))
+
+	Method (_STA) {
+		If (LEqual (HTCE, One)) {
+			Return (0x0F)
+		}
+		Return (Zero)
+	}
+
+	Method (_TMP) {	/* Current temp in tenths degree Kelvin. */
+		Multiply (TNOW, 10, Local0)
+		ShiftRight (Local0, 3, Local0)
+		Return (Add (Local0, K10TEMP_KELVIN_OFFSET))
+	}
+
+	Method (_CRT) {	/* Critical temp in tenths degree Kelvin. */
+		Multiply (TLMT, 10, Local0)
+		ShiftRight (Local0, 1, Local0)
+		Add (Local0, K10TEMP_TLIMIT_OFFSET, Local0)
+		Return (Add (Local0, K10TEMP_KELVIN_OFFSET))
+	}
+
+	Method (_HOT) {	/* Hot temp in tenths degree Kelvin. */
+		Return (Subtract (_CRT, K10TEMP_HOT_OFFSET))
+	}
+}