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/*
* 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;
}
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