diff options
Diffstat (limited to 'src/southbridge/intel/i82371eb/wakeup.c')
| -rw-r--r-- | src/southbridge/intel/i82371eb/wakeup.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/southbridge/intel/i82371eb/wakeup.c b/src/southbridge/intel/i82371eb/wakeup.c new file mode 100644 index 0000000000..f018ad9adf --- /dev/null +++ b/src/southbridge/intel/i82371eb/wakeup.c @@ -0,0 +1,59 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdint.h> +#include <arch/io.h> +#include <console/console.h> +#include "i82371eb.h" + +int acpi_get_sleep_type(void); + +/* + * 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; +} |