pmlib.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/acpimmio.h>
#include <amdblocks/pmlib.h>
#include <console/console.h>
#include <types.h>
 
/* This register is a bit of an odd one. The configuration gets written into the lower nibble,
   but ends up being copied to the upper nibble which gets initialized by this. */
#define PM_RTC_SHADOW_REG       0x5b
#define   PWR_PWRSTATE          BIT(2) /* power state bit; needs to be written as 1 */
#define   PWR_FAIL_OFF          0x0 /* Always power off after power resumes */
#define   PWR_FAIL_ON           0x1 /* Always power on after power resumes */
#define   PWR_FAIL_PREV         0x3 /* Use previous setting after power resumes */
 
void pm_set_power_failure_state(void)
{
        uint8_t pwr_fail = PWR_PWRSTATE;
 
        switch (CONFIG_MAINBOARD_POWER_FAILURE_STATE) {
        case MAINBOARD_POWER_STATE_OFF:
                printk(BIOS_INFO, "Set power off after power failure.\n");
                pwr_fail |= PWR_FAIL_OFF;
                break;
        case MAINBOARD_POWER_STATE_ON:
                printk(BIOS_INFO, "Set power on after power failure.\n");
                pwr_fail |= PWR_FAIL_ON;
                break;
        case MAINBOARD_POWER_STATE_PREVIOUS:
                printk(BIOS_INFO, "Keep power state after power failure.\n");
                pwr_fail |= PWR_FAIL_PREV;
                break;
        default:
                printk(BIOS_WARNING, "Unknown power-failure state: %d\n",
                                                CONFIG_MAINBOARD_POWER_FAILURE_STATE);
                pwr_fail |= PWR_FAIL_OFF;
                break;
        }
 
        pm_io_write8(PM_RTC_SHADOW_REG, pwr_fail);
}