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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 <console/console.h>
#include <soc/nvidia/tegra124/gpio.h>
#include <stdlib.h>
#include "boardid.h"
uint8_t board_id(void)
{
static int id = -1;
if (id < 0) {
gpio_t gpio[] = {GPIO(Q3), GPIO(T1), GPIO(X1), GPIO(X4)};
int value[ARRAY_SIZE(gpio)];
gpio_get_in_tristate_values(gpio, ARRAY_SIZE(gpio), value);
/* A gpio state is encoded in every two-bit */
id = value[0] << 0 |
value[1] << 2 |
value[2] << 4 |
value[3] << 6;
printk(BIOS_SPEW, "Board TRISTATE ID: %#x.\n", id);
}
return id;
}
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