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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/acpi.h>
#include <soc/southbridge.h>
#include <amdblocks/acpimmio.h>
#include <halt.h>
void poweroff(void)
{
acpi_write32(MMIO_ACPI_PM1_CNT_BLK,
(SLP_TYP_S5 << SLP_TYP_SHIFT) | SLP_EN);
/*
* Setting SLP_TYP_S5 in PM1 triggers SLP_SMI, which is handled by SMM
* to transition to S5 state. If halt is called in SMM, then it prevents
* the SMI handler from being triggered and system never enters S5.
*/
if (!ENV_SMM)
halt();
}
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