[ARM] S3C64XX: Initial support for PM (suspend to RAM)

Add the initial support for the S3C64XX based systems to use
suspend-to-RAM to sleep.

Includes basic debugging for use with the SMDK6410 usign the
LEDs on the baseboard.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

3 files changed, 25 insertions, 2 deletions

diff --git a/arch/arm/plat-s3c/Kconfig b/arch/arm/plat-s3c/Kconfig
index 042d34a6f815..a4c5027421d3 100644
--- a/arch/arm/plat-s3c/Kconfig
+++ b/arch/arm/plat-s3c/Kconfig
@@ -71,6 +71,15 @@ config S3C2410_PM_DEBUG
           Resume code. See <file:Documentation/arm/Samsung-S3C24XX/Suspend.txt>
           for more information.
 
+config S3C_PM_DEBUG_LED_SMDK
+       bool "SMDK LED suspend/resume debugging"
+       depends on PM && (MACH_SMDK6410)
+       help
+         Say Y here to enable the use of the SMDK LEDs on the baseboard
+         for debugging of the state of the suspend and resume process.
+
+         Note, this currently only works for S3C64XX based SMDK boards.
+
 config S3C2410_PM_CHECK
         bool "S3C2410 PM Suspend Memory CRC"
         depends on PM && CRC32
diff --git a/arch/arm/plat-s3c/include/plat/pm.h b/arch/arm/plat-s3c/include/plat/pm.h
index 5f8707e2a09c..7a797192fcf3 100644
--- a/arch/arm/plat-s3c/include/plat/pm.h
+++ b/arch/arm/plat-s3c/include/plat/pm.h
@@ -127,6 +127,18 @@ extern void s3c_pm_dbg(const char *msg, ...);
 #define S3C_PMDBG(fmt...) printk(KERN_DEBUG fmt)
 #endif
 
+#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
+/**
+ * s3c_pm_debug_smdkled() - Debug PM suspend/resume via SMDK Board LEDs
+ * @set: set bits for the state of the LEDs
+ * @clear: clear bits for the state of the LEDs.
+ */
+extern void s3c_pm_debug_smdkled(u32 set, u32 clear);
+
+#else
+static inline void s3c_pm_debug_smdkled(u32 set, u32 clear) { }
+#endif /* CONFIG_S3C_PM_DEBUG_LED_SMDK */
+
 /* suspend memory checking */
 
 #ifdef CONFIG_S3C2410_PM_CHECK
diff --git a/arch/arm/plat-s3c/pm.c b/arch/arm/plat-s3c/pm.c
index 9957b539600f..8d97db2c7a0d 100644
--- a/arch/arm/plat-s3c/pm.c
+++ b/arch/arm/plat-s3c/pm.c
@@ -21,11 +21,10 @@
 
 #include <asm/cacheflush.h>
 #include <mach/hardware.h>
+#include <mach/map.h>
 
 #include <plat/regs-serial.h>
 #include <mach/regs-clock.h>
-#include <mach/regs-gpio.h>
-#include <mach/regs-mem.h>
 #include <mach/regs-irq.h>
 #include <asm/irq.h>
 
@@ -326,6 +325,9 @@ static int s3c_pm_enter(suspend_state_t state)
 
         S3C_PMDBG("%s: post sleep, preparing to return\n", __func__);
 
+        /* LEDs should now be 1110 */
+        s3c_pm_debug_smdkled(1 << 1, 0);
+
         s3c_pm_check_restore();
 
         /* ok, let's return from sleep */