573e21132f
nyan blaze fails to boot because tristates of the board id are interpreted in the reverse order. this change fixes it. BUG=none TEST=Booted Blaze to Linux. Built firmware for Storm. Branch=none Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Change-Id: I4ff8a15cf62869cea22931b5255c3a408a778ed2 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 3f59b13d615a8985edf2029d89af05e95aefad33 Original-Change-Id: I6d81092becb60d12e1cd2a92fc2c261da42c60f5 Original-Reviewed-on: https://chromium-review.googlesource.com/211700 Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org> Original-Tested-by: Daisuke Nojiri <dnojiri@chromium.org> Original-Reviewed-by: David Hendricks <dhendrix@chromium.org> Original-Reviewed-by: Julius Werner <jwerner@chromium.org> Original-Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: http://review.coreboot.org/8980 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/*
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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 <delay.h>
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#include <gpiolib.h>
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int gpio_get_in_tristate_values(gpio_t gpio[], int num_gpio, int tertiary)
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{
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/*
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* GPIOs which are tied to stronger external pull up or pull down
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* will stay there regardless of the internal pull up or pull
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* down setting.
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*
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* GPIOs which are floating will go to whatever level they're
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* internally pulled to.
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*/
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int temp;
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int index;
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int id = 0;
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char value[num_gpio];
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/* Enable internal pull up */
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for (index = 0; index < num_gpio; ++index)
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gpio_input_pullup(gpio[index]);
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/* Wait until signals become stable */
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udelay(10);
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/* Get gpio values at internal pull up */
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for (index = 0; index < num_gpio; ++index)
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value[index] = gpio_get_in_value(gpio[index]);
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/* Enable internal pull down */
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for (index = 0; index < num_gpio; ++index)
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gpio_input_pulldown(gpio[index]);
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/* Wait until signals become stable */
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udelay(10);
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/*
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* Get gpio values at internal pull down.
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* Compare with gpio pull up value and then
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* determine a gpio final value/state:
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* 0: pull down
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* 1: pull up
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* 2: floating
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*/
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for (index = num_gpio - 1; index >= 0; --index) {
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if (tertiary)
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id *= 3;
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else
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id <<= 2;
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temp = gpio_get_in_value(gpio[index]);
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id += ((value[index] ^ temp) << 1) | temp;
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}
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/* Disable pull up / pull down to conserve power */
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for (index = 0; index < num_gpio; ++index)
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gpio_input(gpio[index]);
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return id;
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}
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