mb/google/hatch: Enable/disable GPIO clock gating

Before the system enters S0ix or S3, each GPIO community
will have its dynamic clock gating turned on.  Upon return
to S0, the dynamic clock gating will be turned back off.

BUG=b:130764684
BRANCH=none
TEST=Used dut-power to verify that the clock gating is enabled
in S0ix and S3.  Also used Store(..., Debug) statements in the
ASL code to verify it was getting called.

Change-Id: I20ff2aac035eaa5912af6c946d837567a4918bbf
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34180
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/hatch/dsdt.asl

@@ -41,6 +41,9 @@ DefinitionBlock(
 			#include <soc/intel/cannonlake/acpi/northbridge.asl>
 			#include <soc/intel/cannonlake/acpi/southbridge.asl>
 		}
+
+		/* Mainboard hooks */
+		#include "mainboard.asl"
 	}
 
 #if CONFIG(CHROMEOS)

src/mainboard/google/hatch/mainboard.asl

@@ -0,0 +1,57 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google, LLC
+ *
+ * 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 <intelblocks/gpio.h>
+
+Method (LOCL, 1, Serialized)
+{
+	For (Local0 = 0, Local0 < 5, Local0++)
+	{
+		\_SB.PCI0.CGPM (Local0, Arg0)
+	}
+}
+
+/*
+ * Method called from _PTS prior to system sleep state entry
+ * Enables dynamic clock gating for all 5 GPIO communities
+ */
+Method (MPTS, 1, Serialized)
+{
+	LOCL (MISCCFG_ENABLE_GPIO_PM_CONFIG)
+}
+
+/*
+ * Method called from _WAK prior to system sleep state wakeup
+ * Disables dynamic clock gating for all 5 GPIO communities
+ */
+Method (MWAK, 1, Serialized)
+{
+	LOCL (0)
+}
+
+/*
+ * S0ix Entry/Exit Notifications
+ * Called from \_SB.LPID._DSM
+ */
+Method (MS0X, 1, Serialized)
+{
+	If (Arg0 == 1) {
+		/* S0ix Entry */
+		LOCL (MISCCFG_ENABLE_GPIO_PM_CONFIG)
+	} Else {
+		/* S0ix Exit */
+		LOCL (0)
+	}
+}