[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>

1 files changed, 128 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/s3c2412-pm.c b/arch/arm/mach-s3c2410/s3c2412-pm.c
new file mode 100644
index 000000000000..19b63322d259
--- /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);