mb/google/zork: Add support for GPIO configuration on sleep path

This change adds support to configure GPIOs on the sleep path. This is
required to turn off power to devices that do not act as wake sources
and to assert reset to devices.

Currently, variant_sleep_gpio_table() returns an empty table by
default. In the following changes, entries will be added to
gpio_sleep_table.

BUG=b:152582706

Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I7286cbf165024bdd81f8748e525542dce8dd8702
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/+/2253642
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@google.com>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42932
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/zork/smihandler.c

@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
+
 #include <acpi/acpi.h>
+#include <baseboard/variants.h>
 #include <cpu/x86/smm.h>
 #include <ec/google/chromeec/smm.h>
 #include <gpio.h>
@@ -15,10 +17,17 @@ void mainboard_smi_gpi(u32 gpi_sts)
 }
 void mainboard_smi_sleep(u8 slp_typ)
 {
+	size_t num_gpios;
+	const struct soc_amd_gpio *gpios;
+
 	if (CONFIG(EC_GOOGLE_CHROMEEC))
 		chromeec_smi_sleep(slp_typ, MAINBOARD_EC_S3_WAKE_EVENTS,
 					MAINBOARD_EC_S5_WAKE_EVENTS);
+
+	gpios = variant_sleep_gpio_table(&num_gpios, slp_typ);
+	program_gpios(gpios, num_gpios);
 }
+
 int mainboard_smi_apmc(u8 apmc)
 {
 	if (CONFIG(EC_GOOGLE_CHROMEEC))

src/mainboard/google/zork/variants/baseboard/Makefile.inc

@@ -24,6 +24,8 @@ ramstage-$(CONFIG_BOARD_GOOGLE_BASEBOARD_DALBOZ) += fsps_baseboard_dalboz.c
 ramstage-y += helpers.c
 ramstage-y += tpm_tis.c
 
+smm-y += gpio_baseboard_common.c
+
 # Add OEM ID table
 ifeq ($(CONFIG_USE_OEM_BIN),y)
 cbfs-files-y += oem.bin

src/mainboard/google/zork/variants/baseboard/gpio_baseboard_common.c

@@ -30,3 +30,12 @@ const __weak struct soc_amd_gpio *variant_early_gpio_table(size_t *size)
 	*size = ARRAY_SIZE(early_gpio_table);
 	return early_gpio_table;
 }
+
+static const struct soc_amd_gpio gpio_sleep_table[] = {
+};
+
+const __weak struct soc_amd_gpio *variant_sleep_gpio_table(size_t *size, int slp_typ)
+{
+	*size = ARRAY_SIZE(gpio_sleep_table);
+	return gpio_sleep_table;
+}

src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h

@@ -25,6 +25,13 @@ const struct soc_amd_gpio *variant_base_gpio_table(size_t *size);
  * configuration provided by variant_base_gpio_table().
  */
 const struct soc_amd_gpio *variant_override_gpio_table(size_t *size);
+
+/*
+ * This function provides GPIO table for the pads that need to be configured when entering
+ * sleep.
+ */
+const struct soc_amd_gpio *variant_sleep_gpio_table(size_t *size, int slp_typ);
+
 void variant_romstage_entry(void);
 /* Modify devictree settings during ramstage. */
 void variant_devtree_update(void);