mb/google/volteer: Work around TPM issue by enabling GPIO PM in S0ix

Setting the default values for GPIO community power management, causes
issues in detecting TPM interrupts. So to avoid that GPIO PM has to be
disabled in devicetree. But for S0ix it is needed. This patch implements
a workaround in ASL code to enable GPIO PM on S0ix entry and disable it
on S0ix exit.

This patch adds the following three platform specific methods.

1. MS0X to enable power management features for GPIO communities on
entry and on exit, it disables them.

2. MPTS to enable power management features for GPIO communities when
preparing to sleep.

3. MWAK to disable power management features for GPIO communities on
waking up.

BUG=b:148892882
BRANCH=none
TEST="Boot with this change on volteer proto1 and check for GPIO
community config with debugger"

Signed-off-by: Venkata Krishna Nimmagadda <venkata.krishna.nimmagadda@intel.com>
Change-Id: If522c82c0069a4bf5738beb73a2b4f11ed6f51d3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40261
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Venkata Krishna Nimmagadda <Venkata.krishna.nimmagadda@intel.com>
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/dsdt.asl

@@ -32,11 +32,17 @@ DefinitionBlock(
 			#include <soc/intel/common/block/acpi/acpi/northbridge.asl>
 			#include <soc/intel/tigerlake/acpi/southbridge.asl>
 		}
+		/* Mainboard hooks */
+		#include "mainboard.asl"
 	}
 
 	// Chrome OS specific
 	#include <vendorcode/google/chromeos/acpi/chromeos.asl>
 
+	/* Include Low power idle table for a short term workaround to enable
+	   S0ix. Once cr50 pulse width is fixed, this can be removed. */
+	#include <soc/intel/common/acpi/lpit.asl>
+
 	// Chrome OS Embedded Controller
 	Scope (\_SB.PCI0.LPCB)
 	{

src/mainboard/google/volteer/mainboard.asl

@@ -0,0 +1,48 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <intelblocks/gpio.h>
+
+Method (PGPM, 1, Serialized)
+{
+	For (Local0 = 0, Local0 < 6, 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)
+{
+	PGPM (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)
+{
+	PGPM (0)
+}
+
+/*
+ * S0ix Entry/Exit Notifications
+ * Called from \_SB.LPID._DSM
+ */
+Method (MS0X, 1, Serialized)
+{
+	If (Arg0 == 1) {
+		/* S0ix Entry */
+		PGPM (MISCCFG_ENABLE_GPIO_PM_CONFIG)
+	} Else {
+		/* S0ix Exit */
+		PGPM (0)
+	}
+}