src/soc/samsung/exynos5250/wakeup.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <soc/power.h>
  16 #include <soc/wakeup.h>
  17
  18 void wakeup(void)
  19 {
  20         if (wakeup_need_reset())
  21                 power_reset();
  22
  23         power_init();  /* Ensure ps_hold_setup() for early wakeup. */
  24         power_exit_wakeup();
  25         /* Should never return. If we do, reset. */
  26         power_reset();
  27 }
  28
  29 int get_wakeup_state(void)
  30 {
  31         uint32_t status = power_read_reset_status();
  32
  33         /* DIDLE/LPA can be resumed without clock reset (ex, bootblock),
  34          * and SLEEP requires resetting clock (should be done in ROM stage).
  35          */
  36
  37         if (status == S5P_CHECK_DIDLE || status == S5P_CHECK_LPA)
  38                 return WAKEUP_DIRECT;
  39
  40         if (status == S5P_CHECK_SLEEP)
  41                 return WAKEUP_NEED_CLOCK_RESET;
  42
  43         return IS_NOT_WAKEUP;
  44 }
  45
  46 void wakeup_enable_uart(void)
  47 {
  48         power_release_uart_retention();
  49 }