44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright 2014 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <boardid.h>
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#include <console/console.h>
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#include <gpio.h>
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#include <stdlib.h>
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uint8_t board_id(void)
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{
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static int id = -1;
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static const gpio_t pins[] = {[3] = GPIO(2, A, 7), [2] = GPIO(2, A, 2),
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[1] = GPIO(2, A, 1), [0] = GPIO(2, A, 0)}; /* GPIO2_A0 is LSB */
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if (id < 0) {
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int i;
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id = 0;
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for (i = 0; i < ARRAY_SIZE(pins); i++) {
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gpio_input(pins[i]);
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id |= gpio_get(pins[i]) << i;
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}
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printk(BIOS_SPEW, "Board ID: %d.\n", id);
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}
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return id;
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}
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