acpi_s3.h
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com>
*/
#ifndef __ASM_ACPI_S3_H__
#define __ASM_ACPI_S3_H__
#define WAKEUP_BASE 0x600
/* 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
/* Memory size reserved for S3 resume */
#define S3_RESERVE_SIZE 0x1000
#ifndef __ASSEMBLY__
extern char __wakeup[];
extern int __wakeup_size;
enum acpi_sleep_state {
ACPI_S0,
ACPI_S1,
ACPI_S2,
ACPI_S3,
ACPI_S4,
ACPI_S5,
};
/**
* acpi_ss_string() - get ACPI-defined sleep state string
*
* @pm1_cnt: ACPI-defined sleep state
* @return: a pointer to the sleep state string.
*/
static inline char *acpi_ss_string(enum acpi_sleep_state state)
{
char *ss_string[] = { "S0", "S1", "S2", "S3", "S4", "S5"};
return ss_string[state];
}
/**
* 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;
}
/**
* chipset_prev_sleep_state() - Get chipset previous sleep state
*
* This returns chipset previous sleep state from ACPI registers.
* Platform codes must supply this routine in order to support ACPI S3.
*
* @return ACPI_S0/S1/S2/S3/S4/S5.
*/
enum acpi_sleep_state chipset_prev_sleep_state(void);
/**
* chipset_clear_sleep_state() - Clear chipset sleep state
*
* This clears chipset sleep state in ACPI registers.
* Platform codes must supply this routine in order to support ACPI S3.
*/
void chipset_clear_sleep_state(void);
struct acpi_fadt;
/**
* acpi_resume() - Do ACPI S3 resume
*
* This calls U-Boot wake up assembly stub and jumps to OS's wake up vector.
*
* @fadt: FADT table pointer in the ACPI table
* @return: Never returns
*/
void acpi_resume(struct acpi_fadt *fadt);
/**
* acpi_s3_reserve() - Reserve memory for ACPI S3 resume
*
* This copies memory where real mode interrupt handler stubs reside to the
* reserved place on the stack.
*
* This routine should be called by reserve_arch() before U-Boot is relocated
* when ACPI S3 resume is enabled.
*
* @return: 0 always
*/
int acpi_s3_reserve(void);
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ACPI_S3_H__ */