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>
diff --git a/arch/arm/mach-s3c2410/include/mach/regs-s3c2443-clock.h b/arch/arm/mach-s3c2410/include/mach/regs-s3c2443-clock.h
index 08ab9df..101aeea 100644
--- a/arch/arm/mach-s3c2410/include/mach/regs-s3c2443-clock.h
+++ b/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
diff --git a/arch/arm/mach-s3c2416/Kconfig b/arch/arm/mach-s3c2416/Kconfig
index 657e4fe..87b9c9f 100644
--- a/arch/arm/mach-s3c2416/Kconfig
+++ b/arch/arm/mach-s3c2416/Kconfig
@@ -25,6 +25,11 @@
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 @@
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 6c12c7b..ef038d6 100644
--- a/arch/arm/mach-s3c2416/Makefile
+++ b/arch/arm/mach-s3c2416/Makefile
@@ -11,7 +11,7 @@
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 89f521d..084d121 100644
--- a/arch/arm/mach-s3c2416/irq.c
+++ b/arch/arm/mach-s3c2416/irq.c
@@ -243,6 +243,8 @@
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 0000000..4a04205
--- /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);