src/ec/lenovo/h8/vboot.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <ec/acpi/ec.h>
   4 #include <bootmode.h>
   5 #include <timer.h>
   6 #include <delay.h>
   7
   8 #include "h8.h"
   9
  10 /**
  11  * HACK: Use Fn-Key as recovery mode switch.
  12  * Wait for sense register ready and read Fn-Key state.
  13  */
  14 int get_recovery_mode_switch(void)
  15 {
  16         struct stopwatch sw;
  17
  18         if (!CONFIG(H8_FN_KEY_AS_VBOOT_RECOVERY_SW))
  19                 return 0;
  20
  21         /* Tests showed that it takes:
  22          *  - 700msec on Lenovo T500 from AC power on
  23          *  - less than 150msec on Lenovo T520 from AC power on
  24          */
  25         stopwatch_init_msecs_expire(&sw, 1000);
  26         while (!stopwatch_expired(&sw) && !h8_get_sense_ready())
  27                 mdelay(1);
  28
  29         if (!h8_get_sense_ready())
  30                 return 0;
  31
  32         return h8_get_fn_key();
  33 }
  34
  35 /**
  36  * Only used if CONFIG(CHROMEOS) is set.
  37  * Always zero as the #WP pin of the flash is tied high.
  38  */
  39 int get_write_protect_state(void)
  40 {
  41         return 0;
  42 }