chromeos.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <bootmode.h>
#include <boot/coreboot_tables.h>
#include <gpio.h>
#include <soc/gpio.h>
#include <variant/gpio.h>
#include <types.h>
#include <vendorcode/google/chromeos/chromeos.h>
#include <security/tpm/tss.h>
#include <device/device.h>
#include <intelblocks/pmclib.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[] = {
                {-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));
}
 
int get_write_protect_state(void)
{
        return gpio_get(GPP_E15);
}
 
static bool raw_get_recovery_mode_switch(void)
{
        return !gpio_get(GPP_E8);
}
 
 
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 vboot data
         * or cbmem depending on stage.
         */
        if (ENV_SEPARATE_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 (raw_get_recovery_mode_switch())
                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)
{
        /* Ensure system powers up after CR50 reset */
        if (ENV_RAMSTAGE)
                pmc_soc_set_afterg3_en(true);
}
 
int get_ec_is_trusted(void)
{
        /* Do not have a Chrome EC involved in entering recovery mode;
           Always return trusted. */
        return 1;
}