| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <stdint.h> |
| #include <acpi/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; |
| } |