diff options
Diffstat (limited to 'src/southbridge/intel/bd82x6x/early_pch.c')
| -rw-r--r-- | src/southbridge/intel/bd82x6x/early_pch.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/southbridge/intel/bd82x6x/early_pch.c b/src/southbridge/intel/bd82x6x/early_pch.c index 9f80d41aa4..3438a0ad53 100644 --- a/src/southbridge/intel/bd82x6x/early_pch.c +++ b/src/southbridge/intel/bd82x6x/early_pch.c @@ -20,6 +20,9 @@ #include <arch/io.h> #include <timestamp.h> +#include "pch.h" +#include <arch/acpi.h> +#include <console/console.h> #if CONFIG_COLLECT_TIMESTAMPS tsc_t get_initial_timestamp(void) @@ -31,3 +34,31 @@ tsc_t get_initial_timestamp(void) return base_time; } #endif + + +int southbridge_detect_s3_resume(void) +{ + u32 pm1_cnt; + u16 pm1_sts; + + /* Check PM1_STS[15] to see if we are waking from Sx */ + pm1_sts = inw(DEFAULT_PMBASE + PM1_STS); + + /* Read PM1_CNT[12:10] to determine which Sx state */ + pm1_cnt = inl(DEFAULT_PMBASE + PM1_CNT); + + if ((pm1_sts & WAK_STS) && ((pm1_cnt >> 10) & 7) == 5) { + if (acpi_s3_resume_allowed()) { + printk(BIOS_DEBUG, "Resume from S3 detected.\n"); + /* Clear SLP_TYPE. This will break stage2 but + * we care for that when we get there. + */ + outl(pm1_cnt & ~(7 << 10), DEFAULT_PMBASE + PM1_CNT); + return 1; + } else { + printk(BIOS_DEBUG, "Resume from S3 detected, but disabled.\n"); + } + } + + return 0; +} |