NVS: Add a temp sensor ID and an ACPI Method to set it

This will allow various teams to select which thermal sensor
will control the thermal zones.

Also add a method to notify the thermalzones of a change
so these threshold/sensor methods take effect.

Needs a modified BIOS that uses the NVS TMPS value in
the thermalzone to read a different sensor.

Then, use a kernel driver that contains the following:

/* Adjust temperature sensor id to 2 */
union acpi_object param;
struct acpi_object_list input;
param.type = ACPI_TYPE_INTEGER
param.integer.value = 2
input.count = 1;
input.pointer = &param;
acpi_evaluate_object(NULL, "\\TMPU", &input, NULL);

And ensure that the temperature sensor that is being
monitored switches to ID 2.

Change-Id: I6319741358ba31eb8a3dc635d64f3f0acf683386
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1340
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/southbridge/intel/bd82x6x/acpi/globalnvs.asl

@@ -71,6 +71,7 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
 	F4OF,	 8,	// 0x22 - FAN 4 OFF Threshold
 	F4ON,	 8,	// 0x23 - FAN 4 ON Threshold
 	F4PW,	 8,	// 0x24 - FAN 4 PWM value
+	TMPS,    8,	// 0x25 - Temperature Sensor ID
 	/* Processor Identification */
 	Offset (0x28),
 	APIC,	 8,	// 0x28 - APIC Enabled by coreboot
@@ -82,8 +83,8 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
 	/* Super I/O & CMOS config */
 	Offset (0x32),
 	NATP,	 8,	// 0x32 -
-	S5U0,	 8,	// 0x32 - Enable USB0 in S5
-	S5U1,	 8,	// 0x33 - Enable USB1 in S5
+	S5U0,	 8,	// 0x33 - Enable USB0 in S5
+	S5U1,	 8,	// 0x34 - Enable USB1 in S5
 	S3U0,	 8,	// 0x35 - Enable USB0 in S3
 	S3U1,	 8,	// 0x36 - Enable USB1 in S3
 	S33G,	 8,	// 0x37 - Enable 3G in S3
@@ -208,11 +209,28 @@ Method (S3GD)
 	Store (Zero, \S33G)
 }
 
+External (\_TZ.THRM)
+External (\_TZ.SKIN)
+
+Method (TZUP)
+{
+	/* Update Primary Thermal Zone */
+	If (CondRefOf (\_TZ.THRM, Local0)) {
+		Notify (\_TZ.THRM, 0x81)
+	}
+
+	/* Update Secondary Thermal Zone */
+	If (CondRefOf (\_TZ.SKIN, Local0)) {
+		Notify (\_TZ.SKIN, 0x81)
+	}
+}
+
 /* Update Fan 0 thresholds */
 Method (F0UT, 2)
 {
 	Store (Arg0, \F0OF)
 	Store (Arg1, \F0ON)
+	TZUP ()
 }
 
 /* Update Fan 1 thresholds */
@@ -220,6 +238,7 @@ Method (F1UT, 2)
 {
 	Store (Arg0, \F1OF)
 	Store (Arg1, \F1ON)
+	TZUP ()
 }
 
 /* Update Fan 2 thresholds */
@@ -227,6 +246,7 @@ Method (F2UT, 2)
 {
 	Store (Arg0, \F2OF)
 	Store (Arg1, \F2ON)
+	TZUP ()
 }
 
 /* Update Fan 3 thresholds */
@@ -234,6 +254,7 @@ Method (F3UT, 2)
 {
 	Store (Arg0, \F3OF)
 	Store (Arg1, \F3ON)
+	TZUP ()
 }
 
 /* Update Fan 4 thresholds */
@@ -241,4 +262,12 @@ Method (F4UT, 2)
 {
 	Store (Arg0, \F4OF)
 	Store (Arg1, \F4ON)
+	TZUP ()
+}
+
+/* Update Temperature Sensor ID */
+Method (TMPU, 1)
+{
+	Store (Arg0, \TMPS)
+	TZUP ()
 }

src/southbridge/intel/bd82x6x/nvs.h

@@ -55,7 +55,8 @@ typedef struct {
 	u8	f4of; /* 0x22 - FAN 4 OFF Threshold */
 	u8	f4on; /* 0x23 - FAN 4 ON Threshold */
 	u8	f4pw; /* 0x24 - FAN 4 PWM value */
-	u8	rsvd3[3];
+	u8	tmps; /* 0x25 - Temperature Sensor ID */
+	u8	rsvd3[2];
 	/* Processor Identification */
 	u8	apic; /* 0x28 - APIC enabled */
 	u8	mpen; /* 0x29 - MP capable/enabled */