src/soc/amd/common/block/pm/pmlib.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <amdblocks/acpimmio.h>
   4 #include <amdblocks/pmlib.h>
   5 #include <console/console.h>
   6 #include <types.h>
   7
   8 /* This register is a bit of an odd one. The configuration gets written into the lower nibble,
   9    but ends up being copied to the upper nibble which gets initialized by this. */
  10 #define PM_RTC_SHADOW_REG       0x5b
  11 #define   PWR_PWRSTATE          BIT(2) /* power state bit; needs to be written as 1 */
  12 #define   PWR_FAIL_OFF          0x0 /* Always power off after power resumes */
  13 #define   PWR_FAIL_ON           0x1 /* Always power on after power resumes */
  14 #define   PWR_FAIL_PREV         0x3 /* Use previous setting after power resumes */
  15
  16 void pm_set_power_failure_state(void)
  17 {
  18         uint8_t pwr_fail = PWR_PWRSTATE;
  19
  20         switch (CONFIG_MAINBOARD_POWER_FAILURE_STATE) {
  21         case MAINBOARD_POWER_STATE_OFF:
  22                 printk(BIOS_INFO, "Set power off after power failure.\n");
  23                 pwr_fail |= PWR_FAIL_OFF;
  24                 break;
  25         case MAINBOARD_POWER_STATE_ON:
  26                 printk(BIOS_INFO, "Set power on after power failure.\n");
  27                 pwr_fail |= PWR_FAIL_ON;
  28                 break;
  29         case MAINBOARD_POWER_STATE_PREVIOUS:
  30                 printk(BIOS_INFO, "Keep power state after power failure.\n");
  31                 pwr_fail |= PWR_FAIL_PREV;
  32                 break;
  33         default:
  34                 printk(BIOS_WARNING, "Unknown power-failure state: %d\n",
  35                                                 CONFIG_MAINBOARD_POWER_FAILURE_STATE);
  36                 pwr_fail |= PWR_FAIL_OFF;
  37                 break;
  38         }
  39
  40         pm_write8(PM_RTC_SHADOW_REG, pwr_fail);
  41 }