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>

4 files changed, 93 insertions, 1 deletions

diff --git a/arch/arm/mach-s3c2416/Kconfig b/arch/arm/mach-s3c2416/Kconfig
index 657e4fe17f39..87b9c9f003bd 100644
--- a/arch/arm/mach-s3c2416/Kconfig
+++ b/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
 
diff --git a/arch/arm/mach-s3c2416/Makefile b/arch/arm/mach-s3c2416/Makefile
index 6c12c7bf40ad..ef038d62ffdb 100644
--- a/arch/arm/mach-s3c2416/Makefile
+++ b/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
diff --git a/arch/arm/mach-s3c2416/irq.c b/arch/arm/mach-s3c2416/irq.c
index 89f521d59d06..084d121f368c 100644
--- a/arch/arm/mach-s3c2416/irq.c
+++ b/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)
diff --git a/arch/arm/mach-s3c2416/pm.c b/arch/arm/mach-s3c2416/pm.c
new file mode 100644
index 000000000000..4a04205b04d5
--- /dev/null
+++ b/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);