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/*
* This file is part of the coreboot project.
*
* Copyright 2018 Google LLC
*
* 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 <arch/acpi.h>
#include <arch/early_variables.h>
#include <boot/coreboot_tables.h>
#include <gpio.h>
#include <soc/gpio.h>
#include <variant/gpio.h>
#include <vendorcode/google/chromeos/chromeos.h>
#include <security/tpm/tss.h>
enum rec_mode_state {
REC_MODE_UNINITIALIZED,
REC_MODE_NOT_REQUESTED,
REC_MODE_REQUESTED,
};
static enum rec_mode_state saved_rec_mode CAR_GLOBAL;
void fill_lb_gpios(struct lb_gpios *gpios)
{
struct lb_gpio chromeos_gpios[] = {
{GPIO_PCH_WP, ACTIVE_HIGH, get_write_protect_state(),
"write protect"},
{GPIO_REC_MODE, ACTIVE_LOW, get_recovery_mode_switch(),
"recovery"},
{-1, ACTIVE_HIGH, get_lid_switch(), "lid"},
{-1, ACTIVE_HIGH, 0, "power"},
{-1, ACTIVE_HIGH, gfx_get_init_done(), "oprom"},
{-1, ACTIVE_HIGH, 0, "EC in RW"},
};
lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
}
static int cros_get_gpio_value(int type)
{
const struct cros_gpio *cros_gpios;
size_t i, num_gpios = 0;
cros_gpios = variant_cros_gpios(&num_gpios);
for (i = 0; i < num_gpios; i++) {
const struct cros_gpio *gpio = &cros_gpios[i];
if (gpio->type == type) {
int state = gpio_get(gpio->gpio_num);
if (gpio->polarity == CROS_GPIO_ACTIVE_LOW)
return !state;
else
return state;
}
}
return 0;
}
void mainboard_chromeos_acpi_generate(void)
{
const struct cros_gpio *cros_gpios;
size_t num_gpios = 0;
cros_gpios = variant_cros_gpios(&num_gpios);
chromeos_acpi_gpio_generate(cros_gpios, num_gpios);
}
int get_write_protect_state(void)
{
return cros_get_gpio_value(CROS_GPIO_WP);
}
int get_recovery_mode_switch(void)
{
enum rec_mode_state state = car_get_var(saved_rec_mode);
uint8_t recovery_button_state = 0;
/* Check the global variable first. */
if (state == REC_MODE_NOT_REQUESTED)
return 0;
else if (state == REC_MODE_REQUESTED)
return 1;
state = REC_MODE_NOT_REQUESTED;
/* Read state from the GPIO controlled by servo. */
if (cros_get_gpio_value(CROS_GPIO_REC))
state = REC_MODE_REQUESTED;
/* Read one-time recovery request from cr50. */
else if (tlcl_cr50_get_recovery_button(&recovery_button_state)
== TPM_SUCCESS)
state = recovery_button_state ?
REC_MODE_REQUESTED : REC_MODE_NOT_REQUESTED;
/* Store the state in case this is called again in verstage. */
car_set_var(saved_rec_mode, state);
return state == REC_MODE_REQUESTED;
}
int get_lid_switch(void)
{
return 1;
}
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