/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */

#include <boardid.h>
#include <ec/acpi/ec.h>
#include <ec/google/chromeec/ec.h>
#include <stdint.h>

#include "board_id.h"

static uint32_t get_board_id_via_ext_ec(void)
{
	uint32_t id = BOARD_ID_INIT;

	if (google_chromeec_get_board_version(&id))
		id = BOARD_ID_UNKNOWN;

	return id;
}

/*
 * Get Board ID via EC I/O port write/read
 * Board id is 5 bit, so mask other bits while returning board id.
 */
int get_board_id(void)
{
	MAYBE_STATIC_NONZERO int id = -1;

	if (id < 0) {
		if (CONFIG(EC_GOOGLE_CHROMEEC)) {
			id = get_board_id_via_ext_ec();
		} else {
			uint8_t buffer[2];
			uint8_t index;
			if (send_ec_command(EC_FAB_ID_CMD) == 0) {
				for (index = 0; index < sizeof(buffer); index++)
					buffer[index] = recv_ec_data();
				id = (buffer[0] << 8) | buffer[1];
			}
		}
	}

	return (id & 0x1f);
}
