From 1bac282af43d81d826ef25945a35536fa9bd041d Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Wed, 1 Jun 2011 10:44:50 +0100 Subject: [PATCH] ARM: SAMSUNG: Add support for pre-sleep/post-restore gpio control Add a callback so that per-arch can do pre-sleep and post-resume gpio configuration so that for the S3C64XX, the GPIO configuration is restored before the sleep mode is cleared. For the S3C64XX case, it means that the GPIOs get set back to normal operation after the restore code puts the original configurations back in after the Signed-off-by: Ben Dooks Signed-off-by: Mark Brown Signed-off-by: Kukjin Kim --- arch/arm/mach-s3c2410/include/mach/pm-core.h | 3 +++ arch/arm/mach-s3c64xx/include/mach/pm-core.h | 17 +++++++++++++++++ arch/arm/mach-s5pv210/include/mach/pm-core.h | 3 +++ arch/arm/plat-samsung/pm.c | 2 ++ 4 files changed, 25 insertions(+) diff --git a/arch/arm/mach-s3c2410/include/mach/pm-core.h b/arch/arm/mach-s3c2410/include/mach/pm-core.h index 70a83b209e25..45eea5210c87 100644 --- a/arch/arm/mach-s3c2410/include/mach/pm-core.h +++ b/arch/arm/mach-s3c2410/include/mach/pm-core.h @@ -62,3 +62,6 @@ static inline void s3c_pm_arch_update_uart(void __iomem *regs, struct pm_uart_save *save) { } + +static inline void s3c_pm_restored_gpios(void) { } +static inline void s3c_pm_saved_gpios(void) { } diff --git a/arch/arm/mach-s3c64xx/include/mach/pm-core.h b/arch/arm/mach-s3c64xx/include/mach/pm-core.h index 4ed0f582d222..38659bebe4b1 100644 --- a/arch/arm/mach-s3c64xx/include/mach/pm-core.h +++ b/arch/arm/mach-s3c64xx/include/mach/pm-core.h @@ -96,3 +96,20 @@ static inline void s3c_pm_arch_update_uart(void __iomem *regs, save->ucon = new_ucon; } } + +static inline void s3c_pm_restored_gpios(void) +{ + /* ensure sleep mode has been cleared from the system */ + + __raw_writel(0, S3C64XX_SLPEN); +} + +static inline void s3c_pm_saved_gpios(void) +{ + /* turn on the sleep mode and keep it there, as it seems that during + * suspend the xCON registers get re-set and thus you can end up with + * problems between going to sleep and resuming. + */ + + __raw_writel(S3C64XX_SLPEN_USE_xSLP, S3C64XX_SLPEN); +} diff --git a/arch/arm/mach-s5pv210/include/mach/pm-core.h b/arch/arm/mach-s5pv210/include/mach/pm-core.h index e8d394f8b057..3e22109e1b7b 100644 --- a/arch/arm/mach-s5pv210/include/mach/pm-core.h +++ b/arch/arm/mach-s5pv210/include/mach/pm-core.h @@ -41,3 +41,6 @@ static inline void s3c_pm_arch_update_uart(void __iomem *regs, { /* nothing here yet */ } + +static inline void s3c_pm_restored_gpios(void) { } +static inline void s3c_pm_saved_gpios(void) { } diff --git a/arch/arm/plat-samsung/pm.c b/arch/arm/plat-samsung/pm.c index 5c0a440d6e16..4f9a9515beae 100644 --- a/arch/arm/plat-samsung/pm.c +++ b/arch/arm/plat-samsung/pm.c @@ -268,6 +268,7 @@ static int s3c_pm_enter(suspend_state_t state) /* save all necessary core registers not covered by the drivers */ s3c_pm_save_gpios(); + s3c_pm_saved_gpios(); s3c_pm_save_uarts(); s3c_pm_save_core(); @@ -309,6 +310,7 @@ static int s3c_pm_enter(suspend_state_t state) s3c_pm_restore_core(); s3c_pm_restore_uarts(); s3c_pm_restore_gpios(); + s3c_pm_restored_gpios(); s3c_pm_debug_init(); -- 2.39.5