[ARM] S3C: Move PM support functions to common location

Start moving the PM code by moving all the common support functions
to a common location in arch/arm/plat-s3c. With the move we rename
the functions from s3cxxx_ to s3c_ to fit the new location.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c2410/pm.c

@@ -37,21 +37,14 @@
 #include <plat/cpu.h>
 #include <plat/pm.h>
 
-#ifdef CONFIG_S3C2410_PM_DEBUG
-extern void pm_dbg(const char *fmt, ...);
-#define DBG(fmt...) pm_dbg(fmt)
-#else
-#define DBG(fmt...) printk(KERN_DEBUG fmt)
-#endif
-
 static void s3c2410_pm_prepare(void)
 {
 	/* ensure at least GSTATUS3 has the resume address */
 
 	__raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3);
 
-	DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
-	DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
+	S3C_PMDBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
+	S3C_PMDBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
 
 	if (machine_is_h1940()) {
 		void *base = phys_to_virt(H1940_SUSPEND_CHECK);

arch/arm/mach-s3c2412/pm.c

@@ -85,7 +85,7 @@ static struct sleep_save s3c2412_sleep[] = {
 
 static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
 {
-	s3c2410_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
+	s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 	return 0;
 }
 
@@ -98,7 +98,7 @@ static int s3c2412_pm_resume(struct sys_device *dev)
 	tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
 	__raw_writel(tmp, S3C2412_PWRCFG);
 
-	s3c2410_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
+	s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 	return 0;
 }
 

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

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

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);
+}

arch/arm/plat-s3c24xx/irq.c

@@ -616,7 +616,7 @@ int s3c24xx_irq_suspend(struct sys_device *dev, pm_message_t state)
 	for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
 		save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
 
-	s3c2410_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
+	s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
 	save_eintmask = __raw_readl(S3C24XX_EINTMASK);
 
 	return 0;
@@ -632,7 +632,7 @@ int s3c24xx_irq_resume(struct sys_device *dev)
 	for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
 		__raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
 
-	s3c2410_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
+	s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
 	__raw_writel(save_eintmask, S3C24XX_EINTMASK);
 
 	return 0;