From 74655749a58405e259eaaba66bfc391fdbe1e34e Mon Sep 17 00:00:00 2001 From: Dave Gerlach Date: Mon, 9 Jul 2018 13:03:16 +0530 Subject: ARM: OMAP2+: sleep33/43xx: Make sleep actions configurable Add an argument to the sleep33xx and sleep43xx code to allow us to set flags to determine which portions of the code get called in order to use the same code for multiple power saving modes. This patch allows us to decide whether or not we flush and disable caches, save EMIF context, put the memory into self refresh and disable the EMIF, and/or invoke the wkup_m3 when entering into WFI. Signed-off-by: Dave Gerlach Signed-off-by: Tero Kristo Signed-off-by: Keerthy Signed-off-by: Tony Lindgren --- include/linux/platform_data/pm33xx.h | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/platform_data/pm33xx.h b/include/linux/platform_data/pm33xx.h index f9bed2a0af9d..d231265c135c 100644 --- a/include/linux/platform_data/pm33xx.h +++ b/include/linux/platform_data/pm33xx.h @@ -12,6 +12,29 @@ #include #include +/* + * WFI Flags for sleep code control + * + * These flags allow PM code to exclude certain operations from happening + * in the low level ASM code found in sleep33xx.S and sleep43xx.S + * + * WFI_FLAG_FLUSH_CACHE: Flush the ARM caches and disable caching. Only + * needed when MPU will lose context. + * WFI_FLAG_SELF_REFRESH: Let EMIF place DDR memory into self-refresh and + * disable EMIF. + * WFI_FLAG_SAVE_EMIF: Save context of all EMIF registers and restore in + * resume path. Only needed if PER domain loses context + * and must also have WFI_FLAG_SELF_REFRESH set. + * WFI_FLAG_WAKE_M3: Disable MPU clock or clockdomain to cause wkup_m3 to + * execute when WFI instruction executes. + * WFI_FLAG_RTC_ONLY: Configure the RTC to enter RTC+DDR mode. + */ +#define WFI_FLAG_FLUSH_CACHE BIT(0) +#define WFI_FLAG_SELF_REFRESH BIT(1) +#define WFI_FLAG_SAVE_EMIF BIT(2) +#define WFI_FLAG_WAKE_M3 BIT(3) +#define WFI_FLAG_RTC_ONLY BIT(4) + #ifndef __ASSEMBLER__ struct am33xx_pm_sram_addr { void (*do_wfi)(void); @@ -23,7 +46,8 @@ struct am33xx_pm_sram_addr { struct am33xx_pm_platform_data { int (*init)(void); - int (*soc_suspend)(unsigned int state, int (*fn)(unsigned long)); + int (*soc_suspend)(unsigned int state, int (*fn)(unsigned long), + unsigned long args); struct am33xx_pm_sram_addr *(*get_sram_addrs)(void); }; -- cgit v1.2.3-71-gd317 From 8c5a916f4c8815196cc8a86b9582ca89422aac25 Mon Sep 17 00:00:00 2001 From: Keerthy Date: Mon, 9 Jul 2018 13:03:17 +0530 Subject: ARM: OMAP2+: sleep33/43xx: Add RTC-Mode support Add support for RTC mode to low level suspend code. This includes providing the rtc base address for the assembly code to configuring the PMIC_PWR_EN line late in suspend to enter RTC+DDR mode. Note: This patch also fold in left out space parameter for am33xx_emif_sram_table and am43xx_emif_sram_table Signed-off-by: Dave Gerlach Signed-off-by: Keerthy Signed-off-by: Tony Lindgren --- arch/arm/mach-omap2/pm-asm-offsets.c | 2 ++ arch/arm/mach-omap2/pm33xx-core.c | 10 +++++++ arch/arm/mach-omap2/sleep33xx.S | 5 ++-- arch/arm/mach-omap2/sleep43xx.S | 54 ++++++++++++++++++++++++++++++++++-- drivers/soc/ti/pm33xx.c | 1 + include/linux/platform_data/pm33xx.h | 3 ++ 6 files changed, 71 insertions(+), 4 deletions(-) (limited to 'include/linux') diff --git a/arch/arm/mach-omap2/pm-asm-offsets.c b/arch/arm/mach-omap2/pm-asm-offsets.c index b9846b19e5e2..d8ae8a85b14b 100644 --- a/arch/arm/mach-omap2/pm-asm-offsets.c +++ b/arch/arm/mach-omap2/pm-asm-offsets.c @@ -27,6 +27,8 @@ int main(void) offsetof(struct am33xx_pm_ro_sram_data, amx3_pm_sram_data_virt)); DEFINE(AMX3_PM_RO_SRAM_DATA_PHYS_OFFSET, offsetof(struct am33xx_pm_ro_sram_data, amx3_pm_sram_data_phys)); + DEFINE(AMX3_PM_RTC_BASE_VIRT_OFFSET, + offsetof(struct am33xx_pm_ro_sram_data, rtc_base_virt)); DEFINE(AMX3_PM_RO_SRAM_DATA_SIZE, sizeof(struct am33xx_pm_ro_sram_data)); diff --git a/arch/arm/mach-omap2/pm33xx-core.c b/arch/arm/mach-omap2/pm33xx-core.c index e363b9717fa5..f4971e4a86b2 100644 --- a/arch/arm/mach-omap2/pm33xx-core.c +++ b/arch/arm/mach-omap2/pm33xx-core.c @@ -26,6 +26,7 @@ static struct powerdomain *cefuse_pwrdm, *gfx_pwrdm, *per_pwrdm, *mpu_pwrdm; static struct clockdomain *gfx_l4ls_clkdm; static void __iomem *scu_base; +static struct omap_hwmod *rtc_oh; static int __init am43xx_map_scu(void) { @@ -153,16 +154,25 @@ static struct am33xx_pm_sram_addr *amx3_get_sram_addrs(void) return NULL; } +void __iomem *am43xx_get_rtc_base_addr(void) +{ + rtc_oh = omap_hwmod_lookup("rtc"); + + return omap_hwmod_get_mpu_rt_va(rtc_oh); +} + static struct am33xx_pm_platform_data am33xx_ops = { .init = am33xx_suspend_init, .soc_suspend = am33xx_suspend, .get_sram_addrs = amx3_get_sram_addrs, + .get_rtc_base_addr = am43xx_get_rtc_base_addr, }; static struct am33xx_pm_platform_data am43xx_ops = { .init = am43xx_suspend_init, .soc_suspend = am43xx_suspend, .get_sram_addrs = amx3_get_sram_addrs, + .get_rtc_base_addr = am43xx_get_rtc_base_addr, }; static struct am33xx_pm_platform_data *am33xx_pm_get_pdata(void) diff --git a/arch/arm/mach-omap2/sleep33xx.S b/arch/arm/mach-omap2/sleep33xx.S index 8d0d53b671f9..47a816468cdb 100644 --- a/arch/arm/mach-omap2/sleep33xx.S +++ b/arch/arm/mach-omap2/sleep33xx.S @@ -228,8 +228,6 @@ ENDPROC(am33xx_resume_from_deep_sleep) * Local variables */ .align -resume_addr: - .word cpu_resume - PAGE_OFFSET + 0x80000000 kernel_flush: .word v7_flush_dcache_all virt_mpu_clkctrl: @@ -252,6 +250,9 @@ ENTRY(am33xx_pm_sram) .word am33xx_emif_sram_table .word am33xx_pm_ro_sram_data +resume_addr: +.word cpu_resume - PAGE_OFFSET + 0x80000000 + .align 3 ENTRY(am33xx_pm_ro_sram_data) .space AMX3_PM_RO_SRAM_DATA_SIZE diff --git a/arch/arm/mach-omap2/sleep43xx.S b/arch/arm/mach-omap2/sleep43xx.S index cd7e95f48a73..5b9343b58fc7 100644 --- a/arch/arm/mach-omap2/sleep43xx.S +++ b/arch/arm/mach-omap2/sleep43xx.S @@ -48,6 +48,13 @@ AM43XX_CM_PER_EMIF_CLKCTRL_OFFSET) #define AM43XX_PRM_EMIF_CTRL_OFFSET 0x0030 +#define RTC_SECONDS_REG 0x0 +#define RTC_PMIC_REG 0x98 +#define RTC_PMIC_POWER_EN BIT(16) +#define RTC_PMIC_EXT_WAKEUP_STS BIT(12) +#define RTC_PMIC_EXT_WAKEUP_POL BIT(4) +#define RTC_PMIC_EXT_WAKEUP_EN BIT(0) + .arm .align 3 @@ -147,6 +154,20 @@ sync: ldr r4, [r2, #AMX3_PM_WFI_FLAGS_OFFSET] cache_skip_flush: + /* + * If we are trying to enter RTC+DDR mode we must perform + * a read from the rtc address space to ensure translation + * presence in the TLB to avoid page table walk after DDR + * is unavailable. + */ + tst r4, #WFI_FLAG_RTC_ONLY + beq skip_rtc_va_refresh + + adr r3, am43xx_pm_ro_sram_data + ldr r1, [r3, #AMX3_PM_RTC_BASE_VIRT_OFFSET] + ldr r0, [r1] + +skip_rtc_va_refresh: /* Check if we want self refresh */ tst r4, #WFI_FLAG_SELF_REFRESH beq emif_skip_enter_sr @@ -182,6 +203,34 @@ wait_emif_disable: bne wait_emif_disable emif_skip_disable: + tst r4, #WFI_FLAG_RTC_ONLY + beq skip_rtc_only + + adr r3, am43xx_pm_ro_sram_data + ldr r1, [r3, #AMX3_PM_RTC_BASE_VIRT_OFFSET] + + ldr r0, [r1, #RTC_PMIC_REG] + orr r0, r0, #RTC_PMIC_POWER_EN + orr r0, r0, #RTC_PMIC_EXT_WAKEUP_STS + orr r0, r0, #RTC_PMIC_EXT_WAKEUP_EN + orr r0, r0, #RTC_PMIC_EXT_WAKEUP_POL + str r0, [r1, #RTC_PMIC_REG] + ldr r0, [r1, #RTC_PMIC_REG] + /* Wait for 2 seconds to lose power */ + mov r3, #2 + ldr r2, [r1, #RTC_SECONDS_REG] +rtc_loop: + ldr r0, [r1, #RTC_SECONDS_REG] + cmp r0, r2 + beq rtc_loop + mov r2, r0 + subs r3, r3, #1 + bne rtc_loop + + b re_enable_emif + +skip_rtc_only: + tst r4, #WFI_FLAG_WAKE_M3 beq wkup_m3_skip @@ -247,6 +296,7 @@ wkup_m3_skip: mov r2, #AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE str r2, [r1] +re_enable_emif: /* Re-enable EMIF */ ldr r1, am43xx_virt_emif_clkctrl mov r2, #AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE @@ -381,8 +431,6 @@ ENDPROC(am43xx_resume_from_deep_sleep) * Local variables */ .align -resume_addr: - .word cpu_resume - PAGE_OFFSET + 0x80000000 kernel_flush: .word v7_flush_dcache_all ddr_start: @@ -429,6 +477,8 @@ ENTRY(am43xx_pm_sram) .word am43xx_emif_sram_table .word am43xx_pm_ro_sram_data +resume_addr: + .word cpu_resume - PAGE_OFFSET + 0x80000000 .align 3 ENTRY(am43xx_pm_ro_sram_data) diff --git a/drivers/soc/ti/pm33xx.c b/drivers/soc/ti/pm33xx.c index 0011c8f5ecd7..d0dab323651f 100644 --- a/drivers/soc/ti/pm33xx.c +++ b/drivers/soc/ti/pm33xx.c @@ -229,6 +229,7 @@ static int am33xx_push_sram_idle(void) ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data; ro_sram_data.amx3_pm_sram_data_phys = gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data); + ro_sram_data.rtc_base_virt = pm_ops->get_rtc_base_addr(); /* Save physical address to calculate resume offset during pm init */ am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool, diff --git a/include/linux/platform_data/pm33xx.h b/include/linux/platform_data/pm33xx.h index d231265c135c..fbf5ed73c7cc 100644 --- a/include/linux/platform_data/pm33xx.h +++ b/include/linux/platform_data/pm33xx.h @@ -42,6 +42,7 @@ struct am33xx_pm_sram_addr { unsigned long *resume_offset; unsigned long *emif_sram_table; unsigned long *ro_sram_data; + unsigned long resume_address; }; struct am33xx_pm_platform_data { @@ -49,6 +50,7 @@ struct am33xx_pm_platform_data { int (*soc_suspend)(unsigned int state, int (*fn)(unsigned long), unsigned long args); struct am33xx_pm_sram_addr *(*get_sram_addrs)(void); + void __iomem *(*get_rtc_base_addr)(void); }; struct am33xx_pm_sram_data { @@ -60,6 +62,7 @@ struct am33xx_pm_sram_data { struct am33xx_pm_ro_sram_data { u32 amx3_pm_sram_data_virt; u32 amx3_pm_sram_data_phys; + void __iomem *rtc_base_virt; } __packed __aligned(8); #endif /* __ASSEMBLER__ */ -- cgit v1.2.3-71-gd317