text: /*
   *  CLPS711X CPU idle driver
   *
   *  Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   */
  
  #include <linux/cpuidle.h>
  #include <linux/err.h>
  #include <linux/io.h>
  #include <linux/init.h>
  #include <linux/platform_device.h>
  
  #define CLPS711X_CPUIDLE_NAME	"clps711x-cpuidle"
  
  static void __iomem *clps711x_halt;
  
  static int clps711x_cpuidle_halt(struct cpuidle_device *dev,
  				 struct cpuidle_driver *drv, int index)
  {
  	writel(0xaa, clps711x_halt);
  
  	return index;
  }
  
  static struct cpuidle_driver clps711x_idle_driver = {
  	.name		= CLPS711X_CPUIDLE_NAME,
  	.owner		= THIS_MODULE,
  	.states[0]	= {
  		.name		= "HALT",
  		.desc		= "CLPS711X HALT",
  		.enter		= clps711x_cpuidle_halt,
  		.exit_latency	= 1,
  	},
  	.state_count	= 1,
  };
  
  static int __init clps711x_cpuidle_probe(struct platform_device *pdev)
  {
  	struct resource *res;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	clps711x_halt = devm_ioremap_resource(&pdev->dev, res);
  	if (IS_ERR(clps711x_halt))
  		return PTR_ERR(clps711x_halt);
  
  	return cpuidle_register(&clps711x_idle_driver, NULL);
  }
  
  static struct platform_driver clps711x_cpuidle_driver = {
  	.driver	= {
  		.name	= CLPS711X_CPUIDLE_NAME,
  	},
  };
  builtin_platform_driver_probe(clps711x_cpuidle_driver, clps711x_cpuidle_probe);
  