broadwell: Switch to using common ACPI _SWS code

Use the common ACPI _SWS code and provide a function to fill out
the wake source data.

BUG=chrome-os-partner:40635
BRANCH=none
TEST=emerge-samus coreboot

Change-Id: I3d2ceca8585314122b78317acb7f848efb6e9a14
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: d8afaee8e27222639c5e249d53be28cddcb78f72
Original-Change-Id: Ie551ecf3397c304216046cc2046c071f7b766e5f
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/298168
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11647
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

3 files changed, 15 insertions, 64 deletions

diff --git a/src/soc/intel/broadwell/Kconfig b/src/soc/intel/broadwell/Kconfig
index e01d5598ec..6561fe27fa 100644
--- a/src/soc/intel/broadwell/Kconfig
+++ b/src/soc/intel/broadwell/Kconfig
@@ -42,6 +42,7 @@ config CPU_SPECIFIC_OPTIONS
 	select UDELAY_TSC
 	select SOC_INTEL_COMMON
 	select HAVE_INTEL_FIRMWARE
+	select SOC_INTEL_COMMON_ACPI_WAKE_SOURCE
 
 config BOOTBLOCK_CPU_INIT
 	string
diff --git a/src/soc/intel/broadwell/acpi/platform.asl b/src/soc/intel/broadwell/acpi/platform.asl
index d302720ccc..c00edeb792 100644
--- a/src/soc/intel/broadwell/acpi/platform.asl
+++ b/src/soc/intel/broadwell/acpi/platform.asl
@@ -18,6 +18,9 @@
  * 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)
@@ -71,21 +74,3 @@ 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)
-	}
-}
diff --git a/src/soc/intel/broadwell/ramstage.c b/src/soc/intel/broadwell/ramstage.c
index e699e0233a..c8fb6edbfa 100644
--- a/src/soc/intel/broadwell/ramstage.c
+++ b/src/soc/intel/broadwell/ramstage.c
@@ -27,56 +27,23 @@
 #include <soc/pm.h>
 #include <soc/ramstage.h>
 #include <soc/intel/broadwell/chip.h>
+#include <soc/intel/common/acpi.h>
 
-/* Save bit index for PM1_STS and GPE_STS for ACPI _SWS */
-static void save_acpi_wake_source(global_nvs_t *gnvs)
+/* 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);
-	uint16_t pm1;
-	int gpe_reg;
+	static uint32_t gpe0_sts[GPE0_REG_MAX];
+	int i;
 
-	if (!ps)
-		return;
-
-	pm1 = ps->pm1_sts & ps->pm1_en;
-
-	/* Scan for first set bit in PM1 */
-	for (gnvs->pm1i = 0; gnvs->pm1i < 16; gnvs->pm1i++) {
-		if (pm1 & 1)
-			break;
-		pm1 >>= 1;
-	}
-
-	/* If unable to determine then return -1 */
-	if (gnvs->pm1i >= 16)
-		gnvs->pm1i = -1;
-
-	/* Scan for first set bit in GPE registers */
-	gnvs->gpei = -1;
-	for (gpe_reg = 0; gpe_reg < GPE0_REG_MAX; gpe_reg++) {
-		u32 gpe = ps->gpe0_sts[gpe_reg] & ps->gpe0_en[gpe_reg];
-		int start = gpe_reg * GPE0_REG_SIZE;
-		int end = start + GPE0_REG_SIZE;
-
-		if (gpe == 0) {
-			if (!gnvs->gpei)
-				gnvs->gpei = end;
-			continue;
-		}
-
-		for (gnvs->gpei = start; gnvs->gpei < end; gnvs->gpei++) {
-			if (gpe & 1)
-				break;
-			gpe >>= 1;
-		}
-	}
+	*pm1 = ps->pm1_sts & ps->pm1_en;
 
-	/* If unable to determine then return -1 */
-	if (gnvs->gpei >= (GPE0_REG_MAX * GPE0_REG_SIZE))
-		gnvs->gpei = -1;
+	/* 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];
 
-	printk(BIOS_DEBUG, "ACPI _SWS is PM1 Index %lld GPE Index %lld\n",
-	       gnvs->pm1i, gnvs->gpei);
+	return GPE0_REG_MAX;
 }
 
 static void s3_resume_prepare(void)
@@ -89,8 +56,6 @@ static void s3_resume_prepare(void)
 
 	if (!acpi_is_wakeup_s3())
 		memset(gnvs, 0, sizeof(global_nvs_t));
-	else
-		save_acpi_wake_source(gnvs);
 }
 
 void broadwell_init_pre_device(void *chip_info)