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author | Bin Meng <bmeng.cn@gmail.com> | 2017-04-21 17:24:28 +0300 |
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committer | Bin Meng <bmeng.cn@gmail.com> | 2017-05-17 12:11:46 +0300 |
commit | 4372c111d49f1fa0fec0c8645c23a6266617e69d (patch) | |
tree | df5fe0870381eb09003f8435ef5ff6077ca55201 /arch/x86 | |
parent | 4125bbcef6a998ce8580a1f5c53c8c93a56a125b (diff) | |
download | u-boot-4372c111d49f1fa0fec0c8645c23a6266617e69d.tar.xz |
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>
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/Kconfig | 12 | ||||
-rw-r--r-- | arch/x86/include/asm/acpi_s3.h | 64 |
2 files changed, 76 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 9ead3ebccf..b568852406 100644 --- 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 index 0000000000..78c53ea2fb --- /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__ */ |