a73b93157f
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <base3.h>
|
|
#include <console/console.h>
|
|
#include <delay.h>
|
|
#include <gpio.h>
|
|
|
|
int gpio_base2_value(gpio_t gpio[], int num_gpio)
|
|
{
|
|
int i, result = 0;
|
|
|
|
for (i = 0; i < num_gpio; i++)
|
|
gpio_input(gpio[i]);
|
|
|
|
/* Wait until signals become stable */
|
|
udelay(10);
|
|
|
|
for (i = 0; i < num_gpio; i++)
|
|
result |= gpio_get(gpio[i]) << i;
|
|
|
|
return result;
|
|
}
|
|
|
|
int gpio_base3_value(gpio_t gpio[], int num_gpio)
|
|
{
|
|
/*
|
|
* GPIOs which are tied to stronger external pull up or pull down
|
|
* will stay there regardless of the internal pull up or pull
|
|
* down setting.
|
|
*
|
|
* GPIOs which are floating will go to whatever level they're
|
|
* internally pulled to.
|
|
*/
|
|
|
|
static const char tristate_char[] = {[0] = '0', [1] = '1', [Z] = 'Z'};
|
|
int temp;
|
|
int index;
|
|
int result = 0;
|
|
char value[32];
|
|
assert(num_gpio <= 32);
|
|
|
|
/* Enable internal pull up */
|
|
for (index = 0; index < num_gpio; ++index)
|
|
gpio_input_pullup(gpio[index]);
|
|
|
|
/* Wait until signals become stable */
|
|
udelay(10);
|
|
|
|
/* Get gpio values at internal pull up */
|
|
for (index = 0; index < num_gpio; ++index)
|
|
value[index] = gpio_get(gpio[index]);
|
|
|
|
/* Enable internal pull down */
|
|
for (index = 0; index < num_gpio; ++index)
|
|
gpio_input_pulldown(gpio[index]);
|
|
|
|
/* Wait until signals become stable */
|
|
udelay(10);
|
|
|
|
/*
|
|
* Get gpio values at internal pull down.
|
|
* Compare with gpio pull up value and then
|
|
* determine a gpio final value/state:
|
|
* 0: pull down
|
|
* 1: pull up
|
|
* 2: floating
|
|
*/
|
|
printk(BIOS_DEBUG, "Reading tristate GPIOs: ");
|
|
for (index = num_gpio - 1; index >= 0; --index) {
|
|
temp = gpio_get(gpio[index]);
|
|
temp |= ((value[index] ^ temp) << 1);
|
|
printk(BIOS_DEBUG, "%c ", tristate_char[temp]);
|
|
result = (result * 3) + temp;
|
|
}
|
|
printk(BIOS_DEBUG, "= %d\n", result);
|
|
|
|
/* Disable pull up / pull down to conserve power */
|
|
for (index = 0; index < num_gpio; ++index)
|
|
gpio_input(gpio[index]);
|
|
|
|
return result;
|
|
}
|