src/mainboard/google/nyan_big/boardid.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2014 Google Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <boardid.h>
  17 #include <console/console.h>
  18 #include <gpio.h>
  19 #include <stdlib.h>
  20
  21 uint8_t board_id(void)
  22 {
  23         static int id = -1;
  24         gpio_t gpio[] = {[3] = GPIO(X4), [2] = GPIO(X1),        /* X4 is MSB */
  25                          [1] = GPIO(T1), [0] = GPIO(Q3),};      /* Q3 is LSB */
  26
  27         if (id < 0) {
  28                 id = gpio_base3_value(gpio, ARRAY_SIZE(gpio));
  29
  30                 printk(BIOS_SPEW, "Board TRISTATE ID: %d.\n", id);
  31         }
  32
  33         return id;
  34 }