1 files changed, 27 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c24xx/cpu.c b/arch/arm/plat-s3c24xx/cpu.c
index 21f1fda8b661..32a09931350c 100644
--- a/arch/arm/plat-s3c24xx/cpu.c
+++ b/arch/arm/plat-s3c24xx/cpu.c
@@ -32,6 +32,7 @@
 #include <linux/io.h>
 
 #include <mach/hardware.h>
+#include <mach/regs-clock.h>
 #include <asm/irq.h>
 #include <asm/cacheflush.h>
 
@@ -190,8 +191,34 @@ static unsigned long s3c24xx_read_idcode_v4(void)
         return __raw_readl(S3C2410_GSTATUS1);
 }
 
+static void s3c24xx_default_idle(void)
+{
+        unsigned long tmp;
+        int i;
+
+        /* idle the system by using the idle mode which will wait for an
+         * interrupt to happen before restarting the system.
+         */
+
+        /* Warning: going into idle state upsets jtag scanning */
+
+        __raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
+                     S3C2410_CLKCON);
+
+        /* the samsung port seems to do a loop and then unset idle.. */
+        for (i = 0; i < 50; i++)
+                tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
+
+        /* this bit is not cleared on re-start... */
+
+        __raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
+                     S3C2410_CLKCON);
+}
+
 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
 {
+        arm_pm_idle = s3c24xx_default_idle;
+
         /* initialise the io descriptors we need for initialisation */
         iotable_init(mach_desc, size);
         iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));