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authorBen Dooks <ben-linux@fluff.org>2011-06-01 10:44:50 +0100
committerKukjin Kim <kgene.kim@samsung.com>2011-07-20 23:13:20 +0900
commit1bac282af43d81d826ef25945a35536fa9bd041d (patch)
treeab533c42d30e54e2adae694e8b27558005c82518
parentc17afc0aa69615b4c2250b6476431c4d601890a0 (diff)
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 <ben-linux@fluff.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
-rw-r--r--arch/arm/mach-s3c2410/include/mach/pm-core.h3
-rw-r--r--arch/arm/mach-s3c64xx/include/mach/pm-core.h17
-rw-r--r--arch/arm/mach-s5pv210/include/mach/pm-core.h3
-rw-r--r--arch/arm/plat-samsung/pm.c2
4 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c2410/include/mach/pm-core.h b/arch/arm/mach-s3c2410/include/mach/pm-core.h
index 70a83b209e2..45eea5210c8 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 4ed0f582d22..38659bebe4b 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 e8d394f8b05..3e22109e1b7 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 5c0a440d6e1..4f9a9515bea 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();