/* * This file is part of the coreboot project. * * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> * * 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; either version 2 of the License, or * (at your option) any later version. * * 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 <stdint.h> #include <arch/acpi.h> #include <arch/io.h> #include <console/console.h> #include "i82371eb.h" /* * Intel 82371EB (PIIX4E) datasheet, section 7.2.3, page 142 * * 0: soft off/suspend to disk S5 * 1: suspend to ram S3 * 2: powered on suspend, context lost S2 * Note: 'context lost' means the CPU restarts at the reset * vector * 3: powered on suspend, CPU context lost S1 * Note: Looks like 'CPU context lost' does _not_ mean the * CPU restarts at the reset vector. Most likely only * caches are lost, so both 0x3 and 0x4 map to acpi S1 * 4: powered on suspend, context maintained S1 * 5: working (clock control) S0 * 6: reserved * 7: reserved */ static const u8 acpi_sus_to_slp_typ[8] = { 5, 3, 2, 1, 1, 0, 0, 0 }; int acpi_get_sleep_type(void) { u16 reg, result; reg = inw(DEFAULT_PMBASE + PMCNTRL); result = acpi_sus_to_slp_typ[(reg >> 10) & 7]; printk(BIOS_DEBUG, "Wakeup from ACPI sleep type S%d (PMCNTRL=%04x)\n", result, reg); return result; }