[ARM] 3858/1: S3C2412: power management code

Add S3C2412 power management code, and move the
core register saving in from s3c2412.c

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 137 insertions, 40 deletions

diff --git a/arch/arm/mach-s3c2410/Kconfig b/arch/arm/mach-s3c2410/Kconfig
index 458b36b2353..e50a73f93d3 100644
--- a/arch/arm/mach-s3c2410/Kconfig
+++ b/arch/arm/mach-s3c2410/Kconfig
@@ -176,6 +176,13 @@ config CPU_S3C2412_ONLY
 		   !CPU_S3C2440 && !CPU_S3C2442 && CPU_S3C2412
 	default y if CPU_S3C2412
 
+config S3C2412_PM
+	bool
+	default y if PM
+	depends on CPU_S3C2412
+	help
+	  Internal config node to apply S3C2412 power management
+
 config CPU_S3C2412
 	bool
 	depends on ARCH_S3C2410
diff --git a/arch/arm/mach-s3c2410/Makefile b/arch/arm/mach-s3c2410/Makefile
index 94aef371a52..d66013365b6 100644
--- a/arch/arm/mach-s3c2410/Makefile
+++ b/arch/arm/mach-s3c2410/Makefile
@@ -38,6 +38,8 @@ obj-$(CONFIG_CPU_S3C2412)	+= s3c2412-irq.o
 obj-$(CONFIG_CPU_S3C2412)	+= s3c2412-clock.o
 obj-dma-$(CONFIG_CPU_S3C2412)	+= s3c2412-dma.o
 
+obj-$(CONFIG_S3C2412_PM)	+= s3c2412-pm.o
+
 #
 # S3C244X support
 
diff --git a/arch/arm/mach-s3c2410/s3c2412-pm.c b/arch/arm/mach-s3c2410/s3c2412-pm.c
new file mode 100644
index 00000000000..19b63322d25
--- /dev/null
+++ b/arch/arm/mach-s3c2410/s3c2412-pm.c
@@ -0,0 +1,128 @@
+/* linux/arch/arm/mach-s3c2410/s3c2412-pm.c
+ *
+ * Copyright (c) 2006 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * http://armlinux.simtec.co.uk/.
+ *
+ * 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/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/sysdev.h>
+#include <linux/platform_device.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/arch/regs-power.h>
+#include <asm/arch/regs-gpioj.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/regs-dsc.h>
+
+#include "cpu.h"
+#include "pm.h"
+
+#include "s3c2412.h"
+
+static void s3c2412_cpu_suspend(void)
+{
+	unsigned long tmp;
+
+	/* set our standby method to sleep */
+
+	tmp = __raw_readl(S3C2412_PWRCFG);
+	tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
+	__raw_writel(tmp, S3C2412_PWRCFG);
+
+	/* issue the standby signal into the pm unit. Note, we
+	 * issue a write-buffer drain just in case */
+
+	tmp = 0;
+
+	asm("b 1f\n\t"
+	    ".align 5\n\t"
+	    "1:\n\t"
+	    "mcr p15, 0, %0, c7, c10, 4\n\t"
+	    "mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));
+
+	/* we should never get past here */
+
+	panic("sleep resumed to originator?");
+}
+
+static void s3c2412_pm_prepare(void)
+{
+}
+
+static int s3c2412_pm_add(struct sys_device *sysdev)
+{
+	pm_cpu_prep = s3c2412_pm_prepare;
+	pm_cpu_sleep = s3c2412_cpu_suspend;
+
+	return 0;
+}
+
+static struct sleep_save s3c2412_sleep[] = {
+	SAVE_ITEM(S3C2412_DSC0),
+	SAVE_ITEM(S3C2412_DSC1),
+	SAVE_ITEM(S3C2413_GPJDAT),
+	SAVE_ITEM(S3C2413_GPJCON),
+	SAVE_ITEM(S3C2413_GPJUP),
+
+	/* save the PWRCFG to get back to original sleep method */
+
+	SAVE_ITEM(S3C2412_PWRCFG),
+
+	/* save the sleep configuration anyway, just in case these
+	 * get damaged during wakeup */
+
+	SAVE_ITEM(S3C2412_GPBSLPCON),
+	SAVE_ITEM(S3C2412_GPCSLPCON),
+	SAVE_ITEM(S3C2412_GPDSLPCON),
+	SAVE_ITEM(S3C2412_GPESLPCON),
+	SAVE_ITEM(S3C2412_GPFSLPCON),
+	SAVE_ITEM(S3C2412_GPGSLPCON),
+	SAVE_ITEM(S3C2412_GPHSLPCON),
+	SAVE_ITEM(S3C2413_GPJSLPCON),
+};
+
+static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
+{
+	s3c2410_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
+	return 0;
+}
+
+static int s3c2412_pm_resume(struct sys_device *dev)
+{
+	unsigned long tmp;
+
+	tmp = __raw_readl(S3C2412_PWRCFG);
+	tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
+	tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
+	__raw_writel(tmp, S3C2412_PWRCFG);
+
+	s3c2410_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
+	return 0;
+}
+
+static struct sysdev_driver s3c2412_pm_driver = {
+	.add		= s3c2412_pm_add,
+	.suspend	= s3c2412_pm_suspend,
+	.resume		= s3c2412_pm_resume,
+};
+
+static __init int s3c2412_pm_init(void)
+{
+	return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
+}
+
+arch_initcall(s3c2412_pm_init);
diff --git a/arch/arm/mach-s3c2410/s3c2412.c b/arch/arm/mach-s3c2410/s3c2412.c
index ea25078cf4f..e76431c4146 100644
--- a/arch/arm/mach-s3c2410/s3c2412.c
+++ b/arch/arm/mach-s3c2410/s3c2412.c
@@ -158,48 +158,8 @@ void __init s3c2412_init_clocks(int xtal)
  * as a driver which may support both 2410 and 2440 may try and use it.
 */
 
-#ifdef CONFIG_PM
-static struct sleep_save s3c2412_sleep[] = {
-	SAVE_ITEM(S3C2412_DSC0),
-	SAVE_ITEM(S3C2412_DSC1),
-	SAVE_ITEM(S3C2413_GPJDAT),
-	SAVE_ITEM(S3C2413_GPJCON),
-	SAVE_ITEM(S3C2413_GPJUP),
-
-	/* save the sleep configuration anyway, just in case these
-	 * get damaged during wakeup */
-
-	SAVE_ITEM(S3C2412_GPBSLPCON),
-	SAVE_ITEM(S3C2412_GPCSLPCON),
-	SAVE_ITEM(S3C2412_GPDSLPCON),
-	SAVE_ITEM(S3C2412_GPESLPCON),
-	SAVE_ITEM(S3C2412_GPFSLPCON),
-	SAVE_ITEM(S3C2412_GPGSLPCON),
-	SAVE_ITEM(S3C2412_GPHSLPCON),
-	SAVE_ITEM(S3C2413_GPJSLPCON),
-};
-
-static int s3c2412_suspend(struct sys_device *dev, pm_message_t state)
-{
-	s3c2410_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
-	return 0;
-}
-
-static int s3c2412_resume(struct sys_device *dev)
-{
-	s3c2410_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
-	return 0;
-}
-
-#else
-#define s3c2412_suspend NULL
-#define s3c2412_resume  NULL
-#endif
-
 struct sysdev_class s3c2412_sysclass = {
 	set_kset_name("s3c2412-core"),
-	.suspend	= s3c2412_suspend,
-	.resume		= s3c2412_resume
 };
 
 static int __init s3c2412_core_init(void)