x86: acpi: Add Kconfig option and header file for ACPI resume

This introduces a Kconfig option for ACPI S3 resume, as well as a
header file to include anything related to ACPI S3 resume.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stefan Roese <sr@denx.de>

1 files changed, 64 insertions, 0 deletions

diff --git a/arch/x86/include/asm/acpi_s3.h b/arch/x86/include/asm/acpi_s3.h
new file mode 100644
index 0000000..78c53ea
--- /dev/null
+++ b/arch/x86/include/asm/acpi_s3.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __ASM_ACPI_S3_H__
+#define __ASM_ACPI_S3_H__
+
+/* PM1_STATUS register */
+#define WAK_STS		(1 << 15)
+#define PCIEXPWAK_STS	(1 << 14)
+#define RTC_STS		(1 << 10)
+#define SLPBTN_STS	(1 << 9)
+#define PWRBTN_STS	(1 << 8)
+#define GBL_STS		(1 << 5)
+#define BM_STS		(1 << 4)
+#define TMR_STS		(1 << 0)
+
+/* PM1_CNT register */
+#define SLP_EN		(1 << 13)
+#define SLP_TYP_SHIFT	10
+#define SLP_TYP		(7 << SLP_TYP_SHIFT)
+#define SLP_TYP_S0	0
+#define SLP_TYP_S1	1
+#define SLP_TYP_S3	5
+#define SLP_TYP_S4	6
+#define SLP_TYP_S5	7
+
+enum acpi_sleep_state {
+	ACPI_S0,
+	ACPI_S1,
+	ACPI_S2,
+	ACPI_S3,
+	ACPI_S4,
+	ACPI_S5,
+};
+
+/**
+ * acpi_sleep_from_pm1() - get ACPI-defined sleep state from PM1_CNT register
+ *
+ * @pm1_cnt:	PM1_CNT register value
+ * @return:	ACPI-defined sleep state if given valid PM1_CNT register value,
+ *		-EINVAL otherwise.
+ */
+static inline enum acpi_sleep_state acpi_sleep_from_pm1(u32 pm1_cnt)
+{
+	switch ((pm1_cnt & SLP_TYP) >> SLP_TYP_SHIFT) {
+	case SLP_TYP_S0:
+		return ACPI_S0;
+	case SLP_TYP_S1:
+		return ACPI_S1;
+	case SLP_TYP_S3:
+		return ACPI_S3;
+	case SLP_TYP_S4:
+		return ACPI_S4;
+	case SLP_TYP_S5:
+		return ACPI_S5;
+	}
+
+	return -EINVAL;
+}
+
+#endif /* __ASM_ACPI_S3_H__ */