| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <stdint.h> |
| #include <acpi/acpi.h> |
| #include <console/console.h> |
| |
| #include "pmclib.h" |
| #include "pmbase.h" |
| #include "pmutil.h" |
| |
| int southbridge_detect_s3_resume(void) |
| { |
| u32 pm1_cnt; |
| u16 pm1_sts; |
| int is_s3 = 0; |
| |
| /* Check PM1_STS[15] to see if we are waking from Sx */ |
| pm1_sts = read_pmbase16(PM1_STS); |
| if (pm1_sts & WAK_STS) { |
| /* Read PM1_CNT[12:10] to determine which Sx state */ |
| pm1_cnt = read_pmbase32(PM1_CNT); |
| if (((pm1_cnt >> 10) & 7) == SLP_TYP_S3) { |
| /* Clear SLP_TYPE. */ |
| write_pmbase32(PM1_CNT, pm1_cnt & ~(7 << 10)); |
| is_s3 = 1; |
| } |
| } |
| if (is_s3) { |
| if (!acpi_s3_resume_allowed()) { |
| printk(BIOS_DEBUG, "SB: Resume from S3 detected, but disabled.\n"); |
| return 0; |
| } |
| |
| printk(BIOS_DEBUG, "SB: Resume from S3 detected.\n"); |
| } |
| |
| return is_s3; |
| } |