3 files changed, 134 insertions, 3 deletions

diff --git a/arch/arm/plat-s3c/Makefile b/arch/arm/plat-s3c/Makefile
index 39195f972d5..afd8d089ba1 100644
--- a/arch/arm/plat-s3c/Makefile
+++ b/arch/arm/plat-s3c/Makefile
@@ -18,6 +18,10 @@ obj-y				+= pwm-clock.o
 obj-y				+= gpio.o
 obj-y				+= gpio-config.o
 
+# PM support
+
+obj-$(CONFIG_PM)		+= pm.o
+
 # devices
 
 obj-$(CONFIG_S3C_DEV_HSMMC)	+= dev-hsmmc.o
diff --git a/arch/arm/plat-s3c/include/plat/pm.h b/arch/arm/plat-s3c/include/plat/pm.h
index cc623667e48..a1520997ab8 100644
--- a/arch/arm/plat-s3c/include/plat/pm.h
+++ b/arch/arm/plat-s3c/include/plat/pm.h
@@ -1,6 +1,7 @@
 /* linux/include/asm-arm/plat-s3c24xx/pm.h
  *
  * Copyright (c) 2004 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
  *	Written by Ben Dooks, <ben@simtec.co.uk>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -49,10 +50,18 @@ extern int  s3c2410_cpu_save(unsigned long *saveblk);
 extern void s3c2410_cpu_suspend(void);
 extern void s3c2410_cpu_resume(void);
 
-extern unsigned long s3c2410_sleep_save_phys;
+extern unsigned long s3c_sleep_save_phys;
 
 /* sleep save info */
 
+/**
+ * struct sleep_save - save information for shared peripherals.
+ * @reg: Pointer to the register to save.
+ * @val: Holder for the value saved from reg.
+ *
+ * This describes a list of registers which is used by the pm core and
+ * other subsystem to save and restore register values over suspend.
+ */
 struct sleep_save {
 	void __iomem	*reg;
 	unsigned long	val;
@@ -61,8 +70,11 @@ struct sleep_save {
 #define SAVE_ITEM(x) \
 	{ .reg = (x) }
 
-extern void s3c2410_pm_do_save(struct sleep_save *ptr, int count);
-extern void s3c2410_pm_do_restore(struct sleep_save *ptr, int count);
+/* helper functions to save/restore lists of registers. */
+
+extern void s3c_pm_do_save(struct sleep_save *ptr, int count);
+extern void s3c_pm_do_restore(struct sleep_save *ptr, int count);
+extern void s3c_pm_do_restore_core(struct sleep_save *ptr, int count);
 
 #ifdef CONFIG_PM
 extern int s3c24xx_irq_suspend(struct sys_device *dev, pm_message_t state);
@@ -71,3 +83,21 @@ extern int s3c24xx_irq_resume(struct sys_device *dev);
 #define s3c24xx_irq_suspend NULL
 #define s3c24xx_irq_resume  NULL
 #endif
+
+/* PM debug functions */
+
+#ifdef CONFIG_S3C2410_PM_DEBUG
+/**
+ * s3c_pm_dbg() - low level debug function for use in suspend/resume.
+ * @msg: The message to print.
+ *
+ * This function is used mainly to debug the resume process before the system
+ * can rely on printk/console output. It uses the low-level debugging output
+ * routine printascii() to do its work.
+ */
+extern void s3c_pm_dbg(const char *msg, ...);
+
+#define S3C_PMDBG(fmt...) s3c_pm_dbg(fmt)
+#else
+#define S3C_PMDBG(fmt...) printk(KERN_DEBUG fmt)
+#endif
diff --git a/arch/arm/plat-s3c/pm.c b/arch/arm/plat-s3c/pm.c
new file mode 100644
index 00000000000..122e9b91a7f
--- /dev/null
+++ b/arch/arm/plat-s3c/pm.c
@@ -0,0 +1,97 @@
+/* linux/arch/arm/plat-s3c/pm.c
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2004,2006,2008 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *	http://armlinux.simtec.co.uk/
+ *
+ * S3C common power management (suspend to ram) 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/init.h>
+#include <linux/suspend.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+
+#include <plat/pm.h>
+
+/* for external use */
+
+unsigned long s3c_pm_flags;
+
+#ifdef CONFIG_S3C2410_PM_DEBUG
+extern void printascii(const char *);
+
+void s3c_pm_dbg(const char *fmt, ...)
+{
+	va_list va;
+	char buff[256];
+
+	va_start(va, fmt);
+	vsprintf(buff, fmt, va);
+	va_end(va);
+
+	printascii(buff);
+}
+#endif /* CONFIG_S3C2410_PM_DEBUG */
+
+
+/* helper functions to save and restore register state */
+
+/**
+ * s3c_pm_do_save() - save a set of registers for restoration on resume.
+ * @ptr: Pointer to an array of registers.
+ * @count: Size of the ptr array.
+ *
+ * Run through the list of registers given, saving their contents in the
+ * array for later restoration when we wakeup.
+ */
+void s3c_pm_do_save(struct sleep_save *ptr, int count)
+{
+	for (; count > 0; count--, ptr++) {
+		ptr->val = __raw_readl(ptr->reg);
+		S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
+	}
+}
+
+/**
+ * s3c_pm_do_restore() - restore register values from the save list.
+ * @ptr: Pointer to an array of registers.
+ * @count: Size of the ptr array.
+ *
+ * Restore the register values saved from s3c_pm_do_save().
+ *
+ * Note, we do not use S3C_PMDBG() in here, as the system may not have
+ * restore the UARTs state yet
+*/
+
+void s3c_pm_do_restore(struct sleep_save *ptr, int count)
+{
+	for (; count > 0; count--, ptr++) {
+		printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n",
+		       ptr->reg, ptr->val, __raw_readl(ptr->reg));
+
+		__raw_writel(ptr->val, ptr->reg);
+	}
+}
+
+/**
+ * s3c_pm_do_restore_core() - early restore register values from save list.
+ *
+ * This is similar to s3c_pm_do_restore() except we try and minimise the
+ * side effects of the function in case registers that hardware might need
+ * to work has been restored.
+ *
+ * WARNING: Do not put any debug in here that may effect memory or use
+ * peripherals, as things may be changing!
+*/
+
+void s3c_pm_do_restore_core(struct sleep_save *ptr, int count)
+{
+	for (; count > 0; count--, ptr++)
+		__raw_writel(ptr->val, ptr->reg);
+}