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...@gmail.com>
---
arch/x86/Kconfig | 12 +++++++++
arch/x86/include/asm/acpi_s3.h | 58 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+)
create mode 100644 arch/x86/include/asm/acpi_s3.h
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index dfdd756..7ea9148 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -571,6 +571,18 @@ config GENERATE_ACPI_TABLE
endmenu
+config HAVE_ACPI_RESUME
+ bool "Enable ACPI S3 resume"
+ help
+ Select this to enable ACPI S3 resume. S3 is an ACPI defined sleeping
+ state where all system context is lost except system memory. U-Boot
+ is responsible for restore the machine state as it is before sleep.
+ It needs restore the memory controller, not overwriting memory which
+ is not marked as reserved. For the peripherals which lose their
+ registers, U-Boot needs to write the original value. When everything
+ is done, U-Boot needs to find out the wakeup vector provided by OSes
+ and jump there.
+
config MAX_PIRQ_LINKS
int
default 8
diff --git a/arch/x86/include/asm/acpi_s3.h b/arch/x86/include/asm/acpi_s3.h
new file mode 100644
index 0000000..6fbfc3e
--- /dev/null
+++ b/arch/x86/include/asm/acpi_s3.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2017, Bin Meng <bmeng...@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,
+};
+
+/* Given the provided PM1 control register return the ACPI sleep type */
+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 -1;
+}
+
+#endif /* __ASM_ACPI_S3_H__ */
--
2.9.2
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