text: /* 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/device.h>
  #include <linux/syscore_ops.h>
  #include <linux/io.h>
  
  #include <asm/cacheflush.h>
  
  #include <mach/regs-s3c2443-clock.h>
  
  #include <plat/cpu.h>
  #include <plat/pm.h>
  
  #include "s3c2412-power.h"
  
  extern void s3c2412_sleep_enter(void);
  
  static int s3c2416_cpu_suspend(unsigned long arg)
  {
  	/* 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();
  
  	pr_info("Failed to suspend the system\n");
  	return 1; /* Aborting suspend */
  }
  
  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 device *dev, struct subsys_interface *sif)
  {
  	pm_cpu_prep = s3c2416_pm_prepare;
  	pm_cpu_sleep = s3c2416_cpu_suspend;
  
  	return 0;
  }
  
  static struct subsys_interface s3c2416_pm_interface = {
  	.name		= "s3c2416_pm",
  	.subsys		= &s3c2416_subsys,
  	.add_dev	= s3c2416_pm_add,
  };
  
  static __init int s3c2416_pm_init(void)
  {
  	return subsys_interface_register(&s3c2416_pm_interface);
  }
  
  arch_initcall(s3c2416_pm_init);
  
  
  static void s3c2416_pm_resume(void)
  {
  	/* unset the return-from-sleep amd inform flags */
  	__raw_writel(0x0, S3C2443_PWRMODE);
  	__raw_writel(0x0, S3C2412_INFORM0);
  	__raw_writel(0x0, S3C2412_INFORM1);
  }
  
  struct syscore_ops s3c2416_pm_syscore_ops = {
  	.resume		= s3c2416_pm_resume,
  };
  