vboot.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <ec/acpi/ec.h>
#include <bootmode.h>
#include <timer.h>
#include <delay.h>
 
#include "h8.h"
 
/**
 * HACK: Use Fn-Key as recovery mode switch.
 * Wait for sense register ready and read Fn-Key state.
 */
int get_recovery_mode_switch(void)
{
        struct stopwatch sw;
 
        if (!CONFIG(H8_FN_KEY_AS_VBOOT_RECOVERY_SW))
                return 0;
 
        /* Tests showed that it takes:
         *  - 700msec on Lenovo T500 from AC power on
         *  - less than 150msec on Lenovo T520 from AC power on
         */
        stopwatch_init_msecs_expire(&sw, 1000);
        while (!stopwatch_expired(&sw) && !h8_get_sense_ready())
                mdelay(1);
 
        if (!h8_get_sense_ready())
                return 0;
 
        return h8_get_fn_key();
}
 
/**
 * Only used if CONFIG(CHROMEOS) is set.
 * Always zero as the #WP pin of the flash is tied high.
 */
int get_write_protect_state(void)
{
        return 0;
}