From fcf2fba472ede05df2e7ed5fb141b8caf4f09681 Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Fri, 21 Apr 2017 07:24:29 -0700 Subject: [PATCH] x86: baytrail: acpi: Add APIs for determining/clearing sleep state This adds APIs for determining previous sleep state from ACPI I/O registers, as well as clearing sleep state on BayTrail SoC. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese --- arch/x86/cpu/baytrail/acpi.c | 47 ++++++++++++++++++++++ arch/x86/include/asm/arch-baytrail/iomap.h | 24 +++++++++++ 2 files changed, 71 insertions(+) diff --git a/arch/x86/cpu/baytrail/acpi.c b/arch/x86/cpu/baytrail/acpi.c index fa92d8852e..55ed7de781 100644 --- a/arch/x86/cpu/baytrail/acpi.c +++ b/arch/x86/cpu/baytrail/acpi.c @@ -8,7 +8,9 @@ #include #include #include +#include #include +#include #include #include #include @@ -187,3 +189,48 @@ void acpi_create_gnvs(struct acpi_global_nvs *gnvs) else gnvs->iuart_en = 0; } + +#ifdef CONFIG_HAVE_ACPI_RESUME +/* + * The following two routines are called at a very early stage, even before + * FSP 2nd phase API fsp_init() is called. Registers off ACPI_BASE_ADDRESS + * and PMC_BASE_ADDRESS are accessed, so we need make sure the base addresses + * of these two blocks are programmed by either U-Boot or FSP. + * + * It has been verified that 1st phase API (see arch/x86/lib/fsp/fsp_car.S) + * on Intel BayTrail SoC already initializes these two base addresses so + * we are safe to access these registers here. + */ + +enum acpi_sleep_state chipset_prev_sleep_state(void) +{ + u32 pm1_sts; + u32 pm1_cnt; + u32 gen_pmcon1; + enum acpi_sleep_state prev_sleep_state = ACPI_S0; + + /* Read Power State */ + pm1_sts = inw(ACPI_BASE_ADDRESS + PM1_STS); + pm1_cnt = inl(ACPI_BASE_ADDRESS + PM1_CNT); + gen_pmcon1 = readl(PMC_BASE_ADDRESS + GEN_PMCON1); + + debug("PM1_STS = 0x%x PM1_CNT = 0x%x GEN_PMCON1 = 0x%x\n", + pm1_sts, pm1_cnt, gen_pmcon1); + + if (pm1_sts & WAK_STS) + prev_sleep_state = acpi_sleep_from_pm1(pm1_cnt); + + if (gen_pmcon1 & (PWR_FLR | SUS_PWR_FLR)) + prev_sleep_state = ACPI_S5; + + return prev_sleep_state; +} + +void chipset_clear_sleep_state(void) +{ + u32 pm1_cnt; + + pm1_cnt = inl(ACPI_BASE_ADDRESS + PM1_CNT); + outl(pm1_cnt & ~(SLP_TYP), ACPI_BASE_ADDRESS + PM1_CNT); +} +#endif diff --git a/arch/x86/include/asm/arch-baytrail/iomap.h b/arch/x86/include/asm/arch-baytrail/iomap.h index 62a91051e4..ec4e9d5212 100644 --- a/arch/x86/include/asm/arch-baytrail/iomap.h +++ b/arch/x86/include/asm/arch-baytrail/iomap.h @@ -35,6 +35,27 @@ #define PMC_BASE_ADDRESS 0xfed03000 #define PMC_BASE_SIZE 0x400 +#define GEN_PMCON1 0x20 +#define UART_EN (1 << 24) +#define DISB (1 << 23) +#define MEM_SR (1 << 21) +#define SRS (1 << 20) +#define CTS (1 << 19) +#define MS4V (1 << 18) +#define PWR_FLR (1 << 16) +#define PME_B0_S5_DIS (1 << 15) +#define SUS_PWR_FLR (1 << 14) +#define WOL_EN_OVRD (1 << 13) +#define DIS_SLP_X_STRCH_SUS_UP (1 << 12) +#define GEN_RST_STS (1 << 9) +#define RPS (1 << 2) +#define AFTERG3_EN (1 << 0) +#define GEN_PMCON2 0x24 +#define SLPSX_STR_POL_LOCK (1 << 18) +#define BIOS_PCI_EXP_EN (1 << 10) +#define PWRBTN_LVL (1 << 9) +#define SMI_LOCK (1 << 4) + /* Power Management Unit */ #define PUNIT_BASE_ADDRESS 0xfed05000 #define PUNIT_BASE_SIZE 0x800 @@ -62,6 +83,9 @@ #define ACPI_BASE_ADDRESS 0x0400 #define ACPI_BASE_SIZE 0x80 +#define PM1_STS 0x00 +#define PM1_CNT 0x04 + #define GPIO_BASE_ADDRESS 0x0500 #define GPIO_BASE_SIZE 0x100 -- 2.25.1