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nyan: Implement the code which reads GPIOs for ChromeOS.

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This file isn't used yet, but it will be turned on when the CONFIG_CHROMEOS
kconfig option is enabled.

BUG=None
TEST=With this and other changes, built and booted into depthcharge and saw
that it could find GPIO related information in the coreboot tables.
BRANCH=None

Change-Id: I92fa7f3c2602e3946ddeb8e6cdf3a09b7bfcf58a
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://chromium-review.googlesource.com/173791
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
This commit is contained in:
Gabe Black 2013-10-19 01:39:57 -07:00 • committed by chrome-internal-fetch
commit 4c394dfbce
1 changed files with 103 additions and 0 deletions
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103
src/mainboard/google/nyan/chromeos.c Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright 2013 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 <boot/coreboot_tables.h>
#include <console/console.h>
#include <ec/google/chromeec/ec.h>
#include <ec/google/chromeec/ec_commands.h>
#include <string.h>
#include <vendorcode/google/chromeos/chromeos.h>
#include <soc/nvidia/tegra124/gpio.h>
enum {
ACTIVE_LOW = 0,
ACTIVE_HIGH = 1
};
void fill_lb_gpios(struct lb_gpios *gpios)
{
int count = 0;
/* Write Protect: active low */
gpios->gpios[count].port = GPIO_R1_INDEX;
gpios->gpios[count].polarity = ACTIVE_LOW;
gpios->gpios[count].value = gpio_get_in_value(GPIO_R1_INDEX);
strncpy((char *)gpios->gpios[count].name, "write protect",
GPIO_MAX_NAME_LENGTH);
count++;
/* Recovery: active high */
gpios->gpios[count].port = -1;
gpios->gpios[count].polarity = ACTIVE_HIGH;
gpios->gpios[count].value = get_recovery_mode_switch();
strncpy((char *)gpios->gpios[count].name, "recovery",
GPIO_MAX_NAME_LENGTH);
count++;
/* Lid: active high */
gpios->gpios[count].port = GPIO_R4_INDEX;
gpios->gpios[count].polarity = ACTIVE_HIGH;
gpios->gpios[count].value = gpio_get_in_value(GPIO_R4_INDEX);
strncpy((char *)gpios->gpios[count].name, "lid", GPIO_MAX_NAME_LENGTH);
count++;
/* Power: active low */
gpios->gpios[count].port = GPIO_Q0_INDEX;
gpios->gpios[count].polarity = ACTIVE_LOW;
gpios->gpios[count].value = gpio_get_in_value(GPIO_Q0_INDEX);
strncpy((char *)gpios->gpios[count].name, "power",
GPIO_MAX_NAME_LENGTH);
count++;
/* Developer: virtual GPIO active high */
gpios->gpios[count].port = -1;
gpios->gpios[count].polarity = ACTIVE_HIGH;
gpios->gpios[count].value = get_developer_mode_switch();
strncpy((char *)gpios->gpios[count].name, "developer",
GPIO_MAX_NAME_LENGTH);
count++;
gpios->size = sizeof(*gpios) + (count * sizeof(struct lb_gpio));
gpios->count = count;
printk(BIOS_ERR, "Added %d GPIOS size %d\n", count, gpios->size);
}
int get_developer_mode_switch(void)
{
return gpio_get_in_value(GPIO_Q6_INDEX);
}
int get_recovery_mode_switch(void)
{
uint32_t ec_events;
/* The GPIO is active low. */
if (!gpio_get_in_value(GPIO_Q7_INDEX)) // RECMODE_GPIO
return 1;
ec_events = google_chromeec_get_events_b();
return !!(ec_events &
EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY));
}
int get_write_protect_state(void)
{
return !gpio_get_in_value(GPIO_R1_INDEX);
}