src/soc/samsung/exynos5420/wakeup.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/cache.h>
   4 #include <soc/power.h>
   5 #include <soc/wakeup.h>
   6
   7 void wakeup(void)
   8 {
   9         if (wakeup_need_reset())
  10                 power_reset();
  11
  12         power_init();  /* Ensure ps_hold_setup() for early wakeup. */
  13         dcache_mmu_disable();
  14         power_exit_wakeup();
  15         /* Should never return. If we do, reset. */
  16         power_reset();
  17 }
  18
  19 int get_wakeup_state(void)
  20 {
  21         uint32_t status = power_read_reset_status();
  22
  23         /* DIDLE/LPA can be resumed without clock reset (ex, bootblock),
  24          * and SLEEP requires resetting clock (should be done in ROM stage).
  25          */
  26
  27         if (status == S5P_CHECK_DIDLE || status == S5P_CHECK_LPA)
  28                 return WAKEUP_DIRECT;
  29
  30         if (status == S5P_CHECK_SLEEP)
  31                 return WAKEUP_NEED_CLOCK_RESET;
  32
  33         return IS_NOT_WAKEUP;
  34 }
  35
  36 void wakeup_enable_uart(void)
  37 {
  38         power_release_uart_retention();
  39 }