diff options
Diffstat (limited to 'src/soc/amd/common/block/acpi/acpi.c')
-rw-r--r-- | src/soc/amd/common/block/acpi/acpi.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/acpi/acpi.c b/src/soc/amd/common/block/acpi/acpi.c new file mode 100644 index 0000000000..200b3c12f5 --- /dev/null +++ b/src/soc/amd/common/block/acpi/acpi.c @@ -0,0 +1,33 @@ +/* + * 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(); +} |