text: /* exynos_drm_iommu.h
   *
   * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   * Authoer: Inki Dae <inki.dae@samsung.com>
   *
   * 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.
   */
  
  #ifndef _EXYNOS_DRM_IOMMU_H_
  #define _EXYNOS_DRM_IOMMU_H_
  
  #define EXYNOS_DEV_ADDR_START	0x20000000
  #define EXYNOS_DEV_ADDR_SIZE	0x40000000
  
  #ifdef CONFIG_DRM_EXYNOS_IOMMU
  
  int drm_create_iommu_mapping(struct drm_device *drm_dev);
  
  void drm_release_iommu_mapping(struct drm_device *drm_dev);
  
  int drm_iommu_attach_device(struct drm_device *drm_dev,
  				struct device *subdrv_dev);
  
  void drm_iommu_detach_device(struct drm_device *dev_dev,
  				struct device *subdrv_dev);
  
  static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
  {
  #ifdef CONFIG_ARM_DMA_USE_IOMMU
  	struct device *dev = drm_dev->dev;
  
  	return dev->archdata.mapping ? true : false;
  #else
  	return false;
  #endif
  }
  
  #else
  
  static inline int drm_create_iommu_mapping(struct drm_device *drm_dev)
  {
  	return 0;
  }
  
  static inline void drm_release_iommu_mapping(struct drm_device *drm_dev)
  {
  }
  
  static inline int drm_iommu_attach_device(struct drm_device *drm_dev,
  						struct device *subdrv_dev)
  {
  	return 0;
  }
  
  static inline void drm_iommu_detach_device(struct drm_device *drm_dev,
  						struct device *subdrv_dev)
  {
  }
  
  static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
  {
  	return false;
  }
  
  #endif
  #endif
  