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>

1 files changed, 84 insertions, 0 deletions

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);