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>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9ead3ebccf89d1c8737058000528e7e99c78e0c0..b568852406140b5763a65b9be71c239e3a9265fb 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -589,6 +589,18 @@ 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 restoring the machine state as it was before sleep.
+         It needs restore the memory controller, without 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 (file)
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__ */