mainboard/lenovo/t400: Add initial ATPX ACPI implementation

Change-Id: I9b86ebec59ccb63db0e1ba61533d162507a22379
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/9320
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>

src/mainboard/lenovo/t400/acpi/graphics.asl

@@ -0,0 +1,101 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
+ *
+ * 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
+ */
+
+/* WARNING
+ * Switchable graphics not yet tested!
+ */
+
+/* Hybrid graphics enable/disable GPIO bitfields */
+Name (HYG1, 0x004A0000)
+Name (HYG2, 0x00020000)
+
+/* GPIO control port */
+Name (GPCP, DEFAULT_GPIOBASE)
+
+/* GPIO control map */
+OperationRegion (GPCM, SystemIO, GPCP, 0x3F)
+Field (GPCM, ByteAcc, NoLock, Preserve) {
+	GPUS, 32,
+	GPIS, 32,
+	Offset (0x0C),
+	GPLV, 32,
+	Offset (0x30),
+	GQUS, 32,
+	GQIS, 32,
+	GQLV, 32
+}
+
+Method(SHYB, 1) {
+	/* Switch hybrid graphics */
+	if (LEqual(Arg0, One))
+	{
+		/* Discrete graphics requested */
+		Or(GPLV, HYG1, GPLV)
+		Or(GQLV, HYG2, GQLV)
+	}
+	else
+	{
+		/* Integrated graphics requested */
+		Xor(HYG1, 0xFFFFFFFF, Local0)
+		And(GPLV, Local0, GPLV)
+		Xor(HYG2, 0xFFFFFFFF, Local0)
+		And(GQLV, Local0, GQLV)
+	}
+}
+
+Method (ATPX, 2, NotSerialized) {
+	/* Create local variables */
+	Name (ATPR, Buffer (0x08) {
+		0x0, 0x0, 0x0, 0x0,
+		0x0, 0x0, 0x0, 0x0
+	})
+	CreateWordField (ATPR, 0x00, SIZE)
+	CreateWordField (ATPR, 0x02, VERS)
+	CreateDWordField (ATPR, 0x02, MASK)
+	CreateDWordField (ATPR, 0x04, FUNC)
+	CreateDWordField (ATPR, 0x06, FLAG)
+
+	/* Version request */
+	if (LEqual(Arg0, 0x0))
+	{
+		/* Assemble and return version information */
+		Store (0x08, SIZE)	/* Response length */
+		Store (0x01, VERS)	/* Version number */
+		Store (0x0F, FUNC)	/* Supported functions? */
+		Return (ATPR)
+	}
+
+	/* Mux select */
+	if (LEqual(Arg0, 0x2))
+	{
+		CreateByteField (Arg1, 0x02, PWST)
+		Store (PWST, Local0)
+		And (Local0, 0x01, Local0)
+		If (Local0)
+		{
+			/* Enable discrete graphics */
+			SHYB(0x01)
+		}
+		else
+		{
+			/* Enable integrated graphics */
+			SHYB(0x00)
+		}
+	}
+}

src/mainboard/lenovo/t400/dsdt.asl

@@ -53,6 +53,9 @@ DefinitionBlock(
 	/* Chipset specific sleep states */
 	#include <southbridge/intel/i82801ix/acpi/sleepstates.asl>
 
+	/* Hybrid graphics support code */
+	#include "acpi/graphics.asl"
+
 	/* Dock support code */
 	#include "acpi/dock.asl"
 }