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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 <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>
#include <device/device.h>
#include <intelblocks/pmclib.h>
#include <soc/pmc.h>
#include <soc/pci_devs.h>
enum rec_mode_state {
REC_MODE_UNINITIALIZED,
REC_MODE_NOT_REQUESTED,
REC_MODE_REQUESTED,
};
void fill_lb_gpios(struct lb_gpios *gpios)
{
struct lb_gpio chromeos_gpios[] = {
{GPIO_PCH_WP, ACTIVE_HIGH, get_write_protect_state(),
"write protect"},
{-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)
{
static enum rec_mode_state saved_rec_mode = REC_MODE_UNINITIALIZED;
enum rec_mode_state state = REC_MODE_NOT_REQUESTED;
uint8_t cr50_state = 0;
/* Check cached state, since TPM will only tell us the first time */
if (saved_rec_mode != REC_MODE_UNINITIALIZED)
return saved_rec_mode == REC_MODE_REQUESTED;
/*
* Read one-time recovery request from cr50 in verstage only since
* the TPM driver won't be set up in time for other stages like romstage
* and the value from the TPM would be wrong anyway since the verstage
* read would have cleared the value on the TPM.
*
* The TPM recovery request is passed between stages through the
* vboot_get_shared_data or cbmem depending on stage.
*/
if (ENV_VERSTAGE &&
tlcl_cr50_get_recovery_button(&cr50_state) == TPM_SUCCESS &&
cr50_state)
state = REC_MODE_REQUESTED;
/* Read state from the GPIO controlled by servo. */
if (cros_get_gpio_value(CROS_GPIO_REC))
state = REC_MODE_REQUESTED;
/* Store the state in case this is called again in verstage. */
saved_rec_mode = state;
return state == REC_MODE_REQUESTED;
}
int get_lid_switch(void)
{
return 1;
}
void mainboard_prepare_cr50_reset(void)
{
#if ENV_RAMSTAGE
/* Ensure system powers up after CR50 reset */
pmc_set_afterg3(MAINBOARD_POWER_STATE_ON);
#endif
}
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