ARM: S5PC1XX: add cpu idle and system reset support

Add CPU idle support by a call to SoC build-in power management core.
Add system reset support by a simple write to system controll register.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

2 files changed, 32 insertions, 3 deletions

diff --git a/arch/arm/mach-s5pc100/cpu.c b/arch/arm/mach-s5pc100/cpu.c
index 0e718890da32..a23ca5795bc8 100644
--- a/arch/arm/mach-s5pc100/cpu.c
+++ b/arch/arm/mach-s5pc100/cpu.c
@@ -22,6 +22,8 @@
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
 
+#include <asm/proc-fns.h>
+
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 #include <asm/mach/irq.h>
@@ -32,6 +34,7 @@
 
 #include <plat/cpu-freq.h>
 #include <plat/regs-serial.h>
+#include <plat/regs-power.h>
 
 #include <plat/cpu.h>
 #include <plat/devs.h>
@@ -45,6 +48,23 @@
 static struct map_desc s5pc100_iodesc[] __initdata = {
 };
 
+static void s5pc100_idle(void)
+{
+        unsigned long tmp;
+
+        tmp = __raw_readl(S5PC100_PWR_CFG);
+        tmp &= ~S5PC100_PWRCFG_CFG_DEEP_IDLE;
+        tmp &= ~S5PC100_PWRCFG_CFG_WFI_MASK;
+        tmp |= S5PC100_PWRCFG_CFG_WFI_DEEP_IDLE;
+        __raw_writel(tmp, S5PC100_PWR_CFG);
+
+        tmp = __raw_readl(S5PC100_OTHERS);
+        tmp |= S5PC100_PMU_INT_DISABLE;
+        __raw_writel(tmp, S5PC100_OTHERS);
+
+        cpu_do_idle();
+}
+
 /* s5pc100_map_io
  *
  * register the standard cpu IO areas
@@ -93,5 +113,7 @@ int __init s5pc100_init(void)
 {
         printk(KERN_DEBUG "S5PC100: Initialising architecture\n");
 
+        s5pc1xx_idle = s5pc100_idle;
+
         return sysdev_register(&s5pc100_sysdev);
 }
diff --git a/arch/arm/mach-s5pc100/include/mach/system.h b/arch/arm/mach-s5pc100/include/mach/system.h
index e39014375470..f0d31a2a598c 100644
--- a/arch/arm/mach-s5pc100/include/mach/system.h
+++ b/arch/arm/mach-s5pc100/include/mach/system.h
@@ -11,14 +11,21 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
+#include <linux/io.h>
+#include <mach/map.h>
+#include <plat/regs-clock.h>
+
+void (*s5pc1xx_idle)(void);
+
 static void arch_idle(void)
 {
-        /* nothing here yet */
+        if (s5pc1xx_idle)
+                s5pc1xx_idle();
 }
 
 static void arch_reset(char mode, const char *cmd)
 {
-        /* nothing here yet */
+        __raw_writel(S5PC100_SWRESET_RESETVAL, S5PC100_SWRESET);
+        return;
 }
-
 #endif /* __ASM_ARCH_IRQ_H */