/*
   * i.MX27 Power Management Routines
   *
   * Based on Freescale's BSP
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License.
   */
  
  #include <linux/kernel.h>
  #include <linux/suspend.h>
  #include <linux/io.h>
  
  #include "hardware.h"
  
  static int mx27_suspend_enter(suspend_state_t state)
  {
  	u32 cscr;
  	switch (state) {
  	case PM_SUSPEND_MEM:
  		/* Clear MPEN and SPEN to disable MPLL/SPLL */
  		cscr = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
  		cscr &= 0xFFFFFFFC;
  		__raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
  		/* Executes WFI */
  		cpu_do_idle();
  		break;
  
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static const struct platform_suspend_ops mx27_suspend_ops = {
  	.enter = mx27_suspend_enter,
  	.valid = suspend_valid_only_mem,
  };
  
  static int __init mx27_pm_init(void)
  {
  	if (!cpu_is_mx27())
  		return 0;
  
  	suspend_set_ops(&mx27_suspend_ops);
  	return 0;
  }
  
  device_initcall(mx27_pm_init);