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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <boardid.h>
#include <console/console.h>
#include <soc/gpio.h>
#include <stdlib.h>
uint8_t board_id(void)
{
static int id = -1;
static const gpio_t pins[] = {
{ .port = 2, .bank = GPIO_A, .idx = 0 },
{ .port = 2, .bank = GPIO_A, .idx = 1 },
{ .port = 2, .bank = GPIO_A, .idx = 2 },
{ .port = 2, .bank = GPIO_A, .idx = 7 },
};
if (id < 0) {
int i;
id = 0;
for (i = 0; i < ARRAY_SIZE(pins); i++) {
gpio_input(pins[i]);
id |= gpio_get_in_value(pins[i]) << i;
}
printk(BIOS_SPEW, "Board ID: %#x.\n", id);
}
return id;
}
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