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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>
This commit is contained in:
Bin Meng 2017-04-21 07:24:28 -07:00
parent 4125bbcef6
commit 4372c111d4
2 changed files with 76 additions and 0 deletions
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12
arch/x86/Kconfig
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@ -589,6 +589,18 @@ config GENERATE_ACPI_TABLE
endmenu 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 config MAX_PIRQ_LINKS
int int
default 8 default 8

64
arch/x86/include/asm/acpi_s3.h Normal file
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@ -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__ */