[ARM] 3802/1: S3C24XX: PM tidy up cache flushing

Change to using flush_cache_all() in pm.c and
also remove the need to flush the cache in the
PM code.

This changes the sleep.S code to have an entry
to store the registers for resume, and then a
second entry (after the caches are cleaned)
to do the suspend and resume.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 10 insertions, 10 deletions

diff --git a/arch/arm/mach-s3c2410/pm.c b/arch/arm/mach-s3c2410/pm.c
index 164a5b5847d7..46dedd37f438 100644
--- a/arch/arm/mach-s3c2410/pm.c
+++ b/arch/arm/mach-s3c2410/pm.c
@@ -35,6 +35,7 @@
 #include <linux/ioport.h>
 #include <linux/delay.h>
 
+#include <asm/cacheflush.h>
 #include <asm/hardware.h>
 #include <asm/io.h>
 
@@ -52,14 +53,6 @@
 
 unsigned long s3c_pm_flags;
 
-/* cache functions from arch/arm/mm/proc-arm920.S */
-
-#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
-extern void arm920_flush_kern_cache_all(void);
-#else
-static void arm920_flush_kern_cache_all(void) { }
-#endif
-
 #define PFX "s3c24xx-pm: "
 
 static struct sleep_save core_save[] = {
@@ -567,7 +560,7 @@ static int s3c2410_pm_enter(suspend_state_t state)
 
 	/* flush cache back to ram */
 
-	arm920_flush_kern_cache_all();
+	flush_cache_all();
 
 	s3c2410_pm_check_store();
 
@@ -575,7 +568,14 @@ static int s3c2410_pm_enter(suspend_state_t state)
 
 	__raw_writel(0x00, S3C2410_CLKCON);  /* turn off clocks over sleep */
 
-	s3c2410_cpu_suspend(regs_save);
+	/* s3c2410_cpu_save will also act as our return point from when
+	 * we resume as it saves its own register state, so use the return
+	 * code to differentiate return from save and return from sleep */
+
+	if (s3c2410_cpu_save(regs_save) == 0) {
+		flush_cache_all();
+		s3c2410_cpu_suspend();
+	}
 
 	/* restore the cpu state */