/*
   * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
   * Author: Joerg Roedel <joerg.roedel@amd.com>
   *
   * 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.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   */
  
  #ifndef __LINUX_IOMMU_H
  #define __LINUX_IOMMU_H
  
  #define IOMMU_READ	(1)
  #define IOMMU_WRITE	(2)

  #define IOMMU_CACHE	(4) /* DMA cache coherency */

  
  struct device;
  
  struct iommu_domain {
  	void *priv;
  };

  #define IOMMU_CAP_CACHE_COHERENCY	0x1

  #define IOMMU_CAP_INTR_REMAP		0x2	/* isolates device intrs */

  struct iommu_ops {
  	int (*domain_init)(struct iommu_domain *domain);
  	void (*domain_destroy)(struct iommu_domain *domain);
  	int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
  	void (*detach_dev)(struct iommu_domain *domain, struct device *dev);

  	int (*map)(struct iommu_domain *domain, unsigned long iova,
  		   phys_addr_t paddr, int gfp_order, int prot);
  	int (*unmap)(struct iommu_domain *domain, unsigned long iova,
  		     int gfp_order);

  	phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
  				    unsigned long iova);

  	int (*domain_has_cap)(struct iommu_domain *domain,
  			      unsigned long cap);

  };
  
  #ifdef CONFIG_IOMMU_API
  
  extern void register_iommu(struct iommu_ops *ops);
  extern bool iommu_found(void);
  extern struct iommu_domain *iommu_domain_alloc(void);
  extern void iommu_domain_free(struct iommu_domain *domain);
  extern int iommu_attach_device(struct iommu_domain *domain,
  			       struct device *dev);
  extern void iommu_detach_device(struct iommu_domain *domain,
  				struct device *dev);

  extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
  		     phys_addr_t paddr, int gfp_order, int prot);
  extern int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
  		       int gfp_order);

  extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
  				      unsigned long iova);

  extern int iommu_domain_has_cap(struct iommu_domain *domain,
  				unsigned long cap);

  
  #else /* CONFIG_IOMMU_API */
  
  static inline void register_iommu(struct iommu_ops *ops)
  {
  }
  
  static inline bool iommu_found(void)
  {
  	return false;
  }
  
  static inline struct iommu_domain *iommu_domain_alloc(void)
  {
  	return NULL;
  }
  
  static inline void iommu_domain_free(struct iommu_domain *domain)
  {
  }
  
  static inline int iommu_attach_device(struct iommu_domain *domain,
  				      struct device *dev)
  {
  	return -ENODEV;
  }
  
  static inline void iommu_detach_device(struct iommu_domain *domain,
  				       struct device *dev)
  {
  }

  static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
  			    phys_addr_t paddr, int gfp_order, int prot)
  {
  	return -ENODEV;
  }
  
  static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
  			      int gfp_order)
  {
  	return -ENODEV;
  }

  static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
  					     unsigned long iova)
  {
  	return 0;
  }

  static inline int domain_has_cap(struct iommu_domain *domain,
  				 unsigned long cap)
  {
  	return 0;
  }

  #endif /* CONFIG_IOMMU_API */
  
  #endif /* __LINUX_IOMMU_H */