hp/pavilion_m6_1035dx: Add ACPI support for reading battery level

Hook in the EC ASL code. This provides just enough information for the
OS to be able to read the battery information.

EC notifications (_Qxx) do not yet work, and it is unclear if the
issue is in the ACPI code, or if the EC is not set up properly. Thus,
the OS must boot with the battery inserted in order to be able to read
its status.

The _L03 ACPI method is also removed, as the EC SCI uses this event.

Change-Id: I85cbaeb9c77e60bd1c68d928412f897de50c6329
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/5445
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/mainboard/hp/pavilion_m6_1035dx/acpi/ec.asl

@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ * Subject to the GNU GPL v2, or (at your option) any later version.
+ */
+
+/*
+ * EC bits specific to the mainboard
+ */
+#define EC_SCI 3
+/* TODO: We do not yet know how the LID is connected to the platform */
+#define EC_ACPI_LID_SWITCH_OBJECT	Zero
+
+/* ACPI code for EC functions */
+#include <ec/compal/ene932/acpi/ec.asl>

src/mainboard/hp/pavilion_m6_1035dx/acpi/gpe.asl

@@ -19,12 +19,6 @@
 
 Scope(\_GPE) {	/* Start Scope GPE */
 
-	/*  General event 3  */
-	Method(_L03) {
-		/* DBGO("\\_GPE\\_L00\n") */
-		Notify(\_SB.PCI0.PWRB, 0x02) /* NOTIFY_DEVICE_WAKE */
-	}
-
 	/*  Legacy PM event  */
 	Method(_L08) {
 		/* DBGO("\\_GPE\\_L08\n") */

src/mainboard/hp/pavilion_m6_1035dx/acpi/mainboard.asl

@@ -35,9 +35,28 @@
 	Name(OSV, Ones) /* Assume nothing */
 	Name(PMOD, One) /* Assume APIC */
 
+	/* Variables used by EC */
+	/* TODO: These may belong in global non-volatile storage */
+	Name(PWRS, Zero)
+	Name(LIDS, Zero)
+
 	/* AcpiGpe0Blk */
 	OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 		Field(GP0B, ByteAcc, NoLock, Preserve) {
 		, 11,
 		USBS, 1,
 	}
+
+	/*
+	 * Used by EC code on certain events
+	 *
+	 * From ec/compal/ene932/acpi/ec.asl:
+	 * The mainboard must define a PNOT method to handle power state
+	 * notifications and Notify CPU device objects to re-evaluate their
+	 * _PPC and _CST tables.
+	 */
+	Method (PNOT)
+	{
+		Store("Received PNOT call (probably from EC)", Debug)
+		/* TODO: Implement this */
+	}

src/mainboard/hp/pavilion_m6_1035dx/dsdt.asl

@@ -69,6 +69,10 @@ DefinitionBlock (
 
 	}   /* End Scope(_SB)  */
 
+	Scope(\_SB.PCI0.LIBR) {
+		#include "acpi/ec.asl"
+	}
+
 	/* Describe SMBUS for the Southbridge */
 	#include <southbridge/amd/agesa/hudson/acpi/smbus.asl>