text: /*
   * Copyright (C) 2011 Samsung Electronics Co., Ltd.
   *
   * S5P - Helper functions for MIPI-CSIS and MIPI-DSIM D-PHY control
   *
   * 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/export.h>
  #include <linux/kernel.h>
  #include <linux/platform_device.h>
  #include <linux/io.h>
  #include <linux/spinlock.h>
  #include <mach/regs-clock.h>
  
  static int __s5p_mipi_phy_control(int id, bool on, u32 reset)
  {
  	static DEFINE_SPINLOCK(lock);
  	void __iomem *addr;
  	unsigned long flags;
  	u32 cfg;
  
  	id = max(0, id);
  	if (id > 1)
  		return -EINVAL;
  
  	addr = S5P_MIPI_DPHY_CONTROL(id);
  
  	spin_lock_irqsave(&lock, flags);
  
  	cfg = __raw_readl(addr);
  	cfg = on ? (cfg | reset) : (cfg & ~reset);
  	__raw_writel(cfg, addr);
  
  	if (on) {
  		cfg |= S5P_MIPI_DPHY_ENABLE;
  	} else if (!(cfg & (S5P_MIPI_DPHY_SRESETN |
  			    S5P_MIPI_DPHY_MRESETN) & ~reset)) {
  		cfg &= ~S5P_MIPI_DPHY_ENABLE;
  	}
  
  	__raw_writel(cfg, addr);
  	spin_unlock_irqrestore(&lock, flags);
  
  	return 0;
  }
  
  int s5p_csis_phy_enable(int id, bool on)
  {
  	return __s5p_mipi_phy_control(id, on, S5P_MIPI_DPHY_SRESETN);
  }
  EXPORT_SYMBOL(s5p_csis_phy_enable);
  
  int s5p_dsim_phy_enable(struct platform_device *pdev, bool on)
  {
  	return __s5p_mipi_phy_control(pdev->id, on, S5P_MIPI_DPHY_MRESETN);
  }
  EXPORT_SYMBOL(s5p_dsim_phy_enable);
  