mb/google/mancomb: Add stubs to configure GPIOs

BUG=b:182211161
TEST=builds

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I7de5e4a4d2273d0ea5a84210ea0ce28d312eaa95
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51365
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mathew King <mathewk@chromium.org>

src/mainboard/google/mancomb/bootblock.c

@@ -5,5 +5,8 @@
 
 void bootblock_mainboard_early_init(void)
 {
-	/* TODO: Perform mainboard initialization */
+	size_t num_gpios;
+	const struct soc_amd_gpio *gpios;
+	gpios = variant_bootblock_gpio_table(&num_gpios);
+	program_gpios(gpios, num_gpios);
 }

src/mainboard/google/mancomb/mainboard.c

@@ -1,10 +1,21 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
+#include <baseboard/variants.h>
 #include <device/device.h>
 
+static void mainboard_configure_gpios(void)
+{
+	size_t base_num_gpios, override_num_gpios;
+	const struct soc_amd_gpio *base_gpios, *override_gpios;
+	base_gpios = variant_base_gpio_table(&base_num_gpios);
+	override_gpios = variant_override_gpio_table(&override_num_gpios);
+	gpio_configure_pads_with_override(base_gpios, base_num_gpios, override_gpios,
+					  override_num_gpios);
+}
+
 static void mainboard_init(void *chip_info)
 {
-	/* TODO: Perform mainboard initialization */
+	mainboard_configure_gpios();
 }
 
 static void mainboard_enable(struct device *dev)

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

@@ -0,0 +1,3 @@
+bootblock-y += gpio.c
+
+ramstage-y += gpio.c

src/mainboard/google/mancomb/variants/baseboard/gpio.c

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+#include <commonlib/helpers.h>
+
+/* GPIO configuration in ramstage*/
+static const struct soc_amd_gpio base_gpio_table[] = {
+	/* TODO: Fill gpio configuration */
+};
+
+/* Early GPIO configuration in bootblock */
+static const struct soc_amd_gpio bootblock_gpio_table[] = {
+	/* TODO: Fill bootblock gpio configuration */
+};
+
+const struct soc_amd_gpio *__weak variant_base_gpio_table(size_t *size)
+{
+	*size = ARRAY_SIZE(base_gpio_table);
+	return base_gpio_table;
+}
+const struct soc_amd_gpio *__weak variant_override_gpio_table(size_t *size)
+{
+	*size = 0;
+	return NULL;
+}
+
+const struct soc_amd_gpio *__weak variant_bootblock_gpio_table(size_t *size)
+{
+	*size = ARRAY_SIZE(bootblock_gpio_table);
+	return bootblock_gpio_table;
+}

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

@@ -3,4 +3,22 @@
 #ifndef __BASEBOARD_VARIANTS_H__
 #define __BASEBOARD_VARIANTS_H__
 
+#include <amdblocks/gpio_banks.h>
+
+/*
+ * This function provides base GPIO configuration table. It is typically provided by
+ * baseboard using a weak implementation. If GPIO configuration for a variant differs
+ * significantly from the baseboard, then the variant can also provide a strong implementation
+ * of this function.
+ */
+const struct soc_amd_gpio *variant_base_gpio_table(size_t *size);
+/*
+ * This function allows variant to override any GPIOs that are different than the base GPIO
+ * configuration provided by variant_base_gpio_table().
+ */
+const struct soc_amd_gpio *variant_override_gpio_table(size_t *size);
+
+/* This function provides GPIO init in bootblock. */
+const struct soc_amd_gpio *variant_bootblock_gpio_table(size_t *size);
+
 #endif /* __BASEBOARD_VARIANTS_H__ */