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

/* SPDX-License-Identifier: GPL-2.0-only */

#include <amdblocks/acpimmio.h>
#include <amdblocks/pmlib.h>
#include <console/console.h>
#include <types.h>

#define PM_RTC_SHADOW_REG	0x5b
/* Init bit to be set by BIOS while configuring the PWR_FAIL_* shadow bits. */
#define   PWR_FAIL_INIT		BIT(2)
#define   PWR_FAIL_MASK		(BIT(0) | BIT(1) | BIT(2) | BIT(3))
#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 val, pwr_fail = PWR_FAIL_INIT;

	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, "WARNING: Unknown power-failure state: %d\n",
						CONFIG_MAINBOARD_POWER_FAILURE_STATE);
		pwr_fail |= PWR_FAIL_OFF;
		break;
	}

	val = pm_io_read8(PM_RTC_SHADOW_REG) & ~PWR_FAIL_MASK;
	val |= pwr_fail;
	pm_io_write8(PM_RTC_SHADOW_REG, val);
}