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Tobias Diedrich4e22a3b2010-12-13 22:39:46 +01001/*
2 * This file is part of the coreboot project.
3 *
4 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
Tobias Diedrich4e22a3b2010-12-13 22:39:46 +010015 */
16
17#include <stdint.h>
Kyösti Mälkki78c5d582015-01-09 23:48:47 +020018#include <arch/acpi.h>
Tobias Diedrich4e22a3b2010-12-13 22:39:46 +010019#include <arch/io.h>
20#include <console/console.h>
21#include "i82371eb.h"
22
Tobias Diedrich4e22a3b2010-12-13 22:39:46 +010023/*
24 * Intel 82371EB (PIIX4E) datasheet, section 7.2.3, page 142
25 *
26 * 0: soft off/suspend to disk S5
27 * 1: suspend to ram S3
28 * 2: powered on suspend, context lost S2
29 * Note: 'context lost' means the CPU restarts at the reset
30 * vector
31 * 3: powered on suspend, CPU context lost S1
32 * Note: Looks like 'CPU context lost' does _not_ mean the
33 * CPU restarts at the reset vector. Most likely only
34 * caches are lost, so both 0x3 and 0x4 map to acpi S1
35 * 4: powered on suspend, context maintained S1
36 * 5: working (clock control) S0
37 * 6: reserved
38 * 7: reserved
39 */
40static const u8 acpi_sus_to_slp_typ[8] = {
41 5, 3, 2, 1, 1, 0, 0, 0
42};
43
44int acpi_get_sleep_type(void)
45{
46 u16 reg, result;
47
48 reg = inw(DEFAULT_PMBASE + PMCNTRL);
49 result = acpi_sus_to_slp_typ[(reg >> 10) & 7];
50
51 printk(BIOS_DEBUG, "Wakeup from ACPI sleep type S%d (PMCNTRL=%04x)\n", result, reg);
52
53 return result;
54}