mb/google/myst: Add PSP verstage callbacks

Lay the groundwork to prepare for enabling PSP verstage. This change
adds PSP verstage callback to enable eSPI, TPM etc.

BUG=b:284984667
TEST=Build Myst BIOS image with PSP verstage enabled.

Change-Id: Ifc800e8bb27cc4c3fbccc2ab9f51138a7c4b03a6
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75585
Reviewed-by: Tim Van Patten <timvp@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

src/mainboard/google/myst/Makefile.inc

@@ -9,6 +9,8 @@ ramstage-y += mainboard.c
 ramstage-y += port_descriptors.c
 ramstage-$(CONFIG_CHROMEOS) += chromeos.c
 
+verstage-$(CONFIG_VBOOT_STARTS_BEFORE_BOOTBLOCK) += verstage.c
+
 subdirs-y += variants/baseboard
 subdirs-y += variants/$(VARIANT_DIR)
 

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

@@ -8,5 +8,6 @@ romstage-y += gpio.c
 romstage-y += tpm_tis.c
 
 verstage-y += tpm_tis.c
+verstage-$(CONFIG_VBOOT_STARTS_BEFORE_BOOTBLOCK) += gpio.c
 
 smm-y += smihandler.c

src/mainboard/google/myst/verstage.c

@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <amdblocks/acpimmio.h>
+#include <arch/io.h>
+#include <baseboard/variants.h>
+#include <gpio.h>
+#include <psp_verstage.h>
+#include <security/vboot/vboot_common.h>
+#include <soc/espi.h>
+#include <soc/southbridge.h>
+
+void verstage_mainboard_early_init(void)
+{
+	const struct soc_amd_gpio *gpios;
+	size_t num_gpios;
+
+	variant_early_gpio_table(&gpios, &num_gpios);
+	gpio_configure_pads(gpios, num_gpios);
+}
+
+void verstage_mainboard_espi_init(void)
+{
+	const struct soc_amd_gpio *gpios;
+	size_t num_gpios;
+
+	variant_espi_gpio_table(&gpios, &num_gpios);
+	gpio_configure_pads(gpios, num_gpios);
+
+	espi_switch_to_spi1_pads();
+}
+
+void verstage_mainboard_tpm_init(void)
+{
+	const struct soc_amd_gpio *gpios;
+	size_t num_gpios;
+
+	variant_tpm_gpio_table(&gpios, &num_gpios);
+	gpio_configure_pads(gpios, num_gpios);
+}