src/soc/samsung/exynos5420/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 <arch/cache.h>
  16 #include <soc/power.h>
  17 #include <soc/wakeup.h>
  18
  19 void wakeup(void)
  20 {
  21         if (wakeup_need_reset())
  22                 power_reset();
  23
  24         power_init();  /* Ensure ps_hold_setup() for early wakeup. */
  25         dcache_mmu_disable();
  26         power_exit_wakeup();
  27         /* Should never return. If we do, reset. */
  28         power_reset();
  29 }
  30
  31 int get_wakeup_state(void)
  32 {
  33         uint32_t status = power_read_reset_status();
  34
  35         /* DIDLE/LPA can be resumed without clock reset (ex, bootblock),
  36          * and SLEEP requires resetting clock (should be done in ROM stage).
  37          */
  38
  39         if (status == S5P_CHECK_DIDLE || status == S5P_CHECK_LPA)
  40                 return WAKEUP_DIRECT;
  41
  42         if (status == S5P_CHECK_SLEEP)
  43                 return WAKEUP_NEED_CLOCK_RESET;
  44
  45         return IS_NOT_WAKEUP;
  46 }
  47
  48 void wakeup_enable_uart(void)
  49 {
  50         power_release_uart_retention();
  51 }