mb/google/fatcat: Add minimal code support for fatcat

This patch adds initial code block required to build google/fatcat
board with Intel Meteor Lake Silicon. Later after the initial board
power-on is successful, we shall switch to Panther Lake silicon to
build the google/fatcat reference design.

BUG=b:347669091
TEST=Able to build the google/fatcat and able to hit power-on reset
using Intel Meteor Lake SoC platform.

Change-Id: Iad78aec51b2f0f240991c9c35842764a60be988e
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83197
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/src/mainboard/google/fatcat/mainboard.c b/src/mainboard/google/fatcat/mainboard.c
new file mode 100644
index 0000000000..107ee8d9b9
--- /dev/null
+++ b/src/mainboard/google/fatcat/mainboard.c
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi.h>
+#include <acpi/acpigen.h>
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+#include <device/device.h>
+#include <ec/ec.h>
+#include <soc/ramstage.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+
+void __weak fw_config_gpio_padbased_override(struct pad_config *padbased_table)
+{
+	/* default implementation does nothing */
+}
+
+void mainboard_update_soc_chip_config(struct soc_intel_meteorlake_config *config)
+{
+	variant_update_soc_chip_config(config);
+}
+
+__weak void variant_update_soc_chip_config(struct soc_intel_meteorlake_config *config)
+{
+	/* default implementation does nothing */
+}
+
+static void mainboard_init(void *chip_info)
+{
+	struct pad_config *padbased_table;
+	const struct pad_config *base_pads;
+	size_t base_num;
+
+	padbased_table = new_padbased_table();
+	base_pads = variant_gpio_table(&base_num);
+	gpio_padbased_override(padbased_table, base_pads, base_num);
+	fw_config_gpio_padbased_override(padbased_table);
+	gpio_configure_pads_with_padbased(padbased_table);
+	free(padbased_table);
+	baseboard_devtree_update();
+}
+
+void __weak baseboard_devtree_update(void)
+{
+	/* Override dev tree settings per baseboard */
+}
+
+void __weak variant_generate_s0ix_hook(enum s0ix_entry entry)
+{
+	/* Add board-specific MS0X entries */
+	/*
+	   if (s0ix_entry == S0IX_ENTRY) {
+		implement variant operations here
+	   }
+	   if (s0ix_entry == S0IX_EXIT) {
+		implement variant operations here
+	   }
+	 */
+}
+
+static void mainboard_dev_init(struct device *dev)
+{
+	mainboard_ec_init();
+}
+
+static void mainboard_enable(struct device *dev)
+{
+	dev->ops->init = mainboard_dev_init;
+}
+
+struct chip_operations mainboard_ops = {
+	.init = mainboard_init,
+	.enable_dev = mainboard_enable,
+};