ARM: S3C2416: Add Power Management support for SMDK2416

Adds suspend-to-ram support for SMDK2416 based on existing 2412 PM code

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s3c2410/include/mach/regs-s3c2443-clock.h

@@ -118,6 +118,8 @@
 #define S3C2443_SCLKCON_UARTCLK		(1<<8)
 #define S3C2443_SCLKCON_USBHOST		(1<<1)
 
+#define S3C2443_PWRCFG_SLEEP		(1<<15)
+
 #include <asm/div64.h>
 
 static inline unsigned int

arch/arm/mach-s3c2416/Kconfig

@@ -25,6 +25,11 @@ config S3C2416_DMA
 	help
 	  Internal config node for S3C2416 DMA support
 
+config S3C2416_PM
+	bool
+	help
+	  Internal config node to apply S3C2416 power management
+
 menu "S3C2416 Machines"
 
 config MACH_SMDK2416
@@ -33,6 +38,7 @@ config MACH_SMDK2416
 	select S3C_DEV_FB
 	select S3C_DEV_HSMMC
 	select S3C_DEV_HSMMC1
+	select S3C2416_PM if PM
 	help
 	  Say Y here if you are using an SMDK2416
 

arch/arm/mach-s3c2416/Makefile

@@ -11,7 +11,7 @@ obj-				:=
 
 obj-$(CONFIG_CPU_S3C2416)	+= s3c2416.o clock.o
 obj-$(CONFIG_CPU_S3C2416)	+= irq.o
-
+obj-$(CONFIG_S3C2416_PM)	+= pm.o
 #obj-$(CONFIG_S3C2416_DMA)	+= dma.o
 
 # Machine support

arch/arm/mach-s3c2416/irq.c

@@ -243,6 +243,8 @@ static int __init s3c2416_irq_add(struct sys_device *sysdev)
 
 static struct sysdev_driver s3c2416_irq_driver = {
 	.add		= s3c2416_irq_add,
+	.suspend	= s3c24xx_irq_suspend,
+	.resume		= s3c24xx_irq_resume,
 };
 
 static int __init s3c2416_irq_init(void)

arch/arm/mach-s3c2416/pm.c

@@ -0,0 +1,84 @@
+/* linux/arch/arm/mach-s3c2416/pm.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * S3C2416 - PM support (Based on Ben Dooks' S3C2412 PM support)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/sysdev.h>
+#include <linux/io.h>
+
+#include <asm/cacheflush.h>
+
+#include <mach/regs-power.h>
+#include <mach/regs-s3c2443-clock.h>
+
+#include <plat/cpu.h>
+#include <plat/pm.h>
+
+extern void s3c2412_sleep_enter(void);
+
+static void s3c2416_cpu_suspend(void)
+{
+	flush_cache_all();
+
+	/* enable wakeup sources regardless of battery state */
+	__raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG);
+
+	/* set the mode as sleep, 2BED represents "Go to BED" */
+	__raw_writel(0x2BED, S3C2443_PWRMODE);
+
+	s3c2412_sleep_enter();
+}
+
+static void s3c2416_pm_prepare(void)
+{
+	/*
+	 * write the magic value u-boot uses to check for resume into
+	 * the INFORM0 register, and ensure INFORM1 is set to the
+	 * correct address to resume from.
+	 */
+	__raw_writel(0x2BED, S3C2412_INFORM0);
+	__raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1);
+}
+
+static int s3c2416_pm_add(struct sys_device *sysdev)
+{
+	pm_cpu_prep = s3c2416_pm_prepare;
+	pm_cpu_sleep = s3c2416_cpu_suspend;
+
+	return 0;
+}
+
+static int s3c2416_pm_suspend(struct sys_device *dev, pm_message_t state)
+{
+	return 0;
+}
+
+static int s3c2416_pm_resume(struct sys_device *dev)
+{
+	/* unset the return-from-sleep amd inform flags */
+	__raw_writel(0x0, S3C2443_PWRMODE);
+	__raw_writel(0x0, S3C2412_INFORM0);
+	__raw_writel(0x0, S3C2412_INFORM1);
+
+	return 0;
+}
+
+static struct sysdev_driver s3c2416_pm_driver = {
+	.add		= s3c2416_pm_add,
+	.suspend	= s3c2416_pm_suspend,
+	.resume		= s3c2416_pm_resume,
+};
+
+static __init int s3c2416_pm_init(void)
+{
+	return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver);
+}
+
+arch_initcall(s3c2416_pm_init);