skylake: Use common ACPI _SWS code

Enable and use the common code for filling out the NVS data used
by the _SWS methods.  Add a function to provide the wake source
data.  With Deep S3 enabled skylake does not retain the contents
of the PM1_EN register so instead just select the wake related
events in PM1_STS.

BUG=chrome-os-partner:40635
BRANCH=none
TEST=tested on glados by checking for valid _SWS string in
/sys/firmware/log after suspend/resume.  Wake sources that were
tested are RTC, power button, keypress, trackpad, and wifi.

Change-Id: I93a4f740f2e2ef1c34e948db1d8e273332296921
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: cb4d4705b87ef7169f1979009c34a58de93c4ef0
Original-Change-Id: Ib6b4df09ea3090894f09290d00dcdc5aebc3eabb
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/298169
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11648
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/intel/skylake/Kconfig

@@ -37,6 +37,7 @@ config CPU_SPECIFIC_OPTIONS
 	select RELOCATABLE_MODULES
 	select RELOCATABLE_RAMSTAGE
 	select SOC_INTEL_COMMON
+	select SOC_INTEL_COMMON_ACPI_WAKE_SOURCE
 	select SOC_INTEL_COMMON_FSP_RAM_INIT
 	select SOC_INTEL_COMMON_FSP_ROMSTAGE
 	select SOC_INTEL_COMMON_RESET

src/soc/intel/skylake/acpi.c

@@ -37,6 +37,7 @@
 #include <cpu/intel/turbo.h>
 #include <ec/google/chromeec/ec.h>
 #include <vendorcode/google/chromeos/gnvs.h>
+#include <soc/intel/common/acpi.h>
 #include <soc/acpi.h>
 #include <soc/cpu.h>
 #include <soc/iomap.h>
@@ -604,6 +605,26 @@ void southcluster_inject_dsdt(device_t device)
 	}
 }
 
+/* Save wake source information for calculating ACPI _SWS values */
+int soc_fill_acpi_wake(uint32_t *pm1, uint32_t **gpe0)
+{
+	struct chipset_power_state *ps = cbmem_find(CBMEM_ID_POWER_STATE);
+	static uint32_t gpe0_sts[GPE0_REG_MAX];
+	uint32_t pm1_en;
+	int i;
+
+	/* PM1_EN state is lost in Deep S3 so enable basic wake events */
+	pm1_en = ps->pm1_en | PCIEXPWAK_STS | RTC_STS | PWRBTN_STS | BM_STS;
+	*pm1 = ps->pm1_sts & pm1_en;
+
+	/* Mask off GPE0 status bits that are not enabled */
+	*gpe0 = &gpe0_sts[0];
+	for (i = 0; i < GPE0_REG_MAX; i++)
+		gpe0_sts[i] = ps->gpe0_sts[i] & ps->gpe0_en[i];
+
+	return GPE0_REG_MAX;
+}
+
 __attribute__((weak)) void acpi_mainboard_gnvs(global_nvs_t *gnvs)
 {
 }

src/soc/intel/skylake/acpi/platform.asl

@@ -19,6 +19,9 @@
  * Foundation, Inc.
  */
 
+/* Enable ACPI _SWS methods */
+#include <soc/intel/common/acpi/acpi_wake_source.asl>
+
 /* The APM port can be used for generating software SMIs */
 
 OperationRegion (APMP, SystemIO, 0xb2, 2)
@@ -83,21 +86,3 @@ Method (_WAK, 1)
 {
 	Return (Package (){ 0, 0 })
 }
-
-Scope (\_SB)
-{
-	Method (_SWS)
-	{
-		/* Index into PM1 for device that caused wake */
-		Return (\PM1I)
-	}
-}
-
-Scope (\_GPE)
-{
-	Method (_SWS)
-	{
-		/* Index into GPE for device that caused wake */
-		Return (\GPEI)
-	}
-}