1 files changed, 52 insertions, 0 deletions
diff --git a/src/southbridge/intel/common/pmclib.c b/src/southbridge/intel/common/pmclib.c
new file mode 100644
index 0000000000..198562baee
--- /dev/null
+++ b/src/southbridge/intel/common/pmclib.c
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ *
+ * 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; version 2 of
+ * the License.
+ *
+ * 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.
+ */
+
+#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;
+}