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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <stdint.h>
#include <arch/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;
}
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