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kernel/linux-imx6_3.14.28/include/linux/omap-iommu.h 1.69 KB
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  /*
   * omap iommu: simple virtual address space management
   *
   * Copyright (C) 2008-2009 Nokia Corporation
   *
   * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.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.
   */
  
  #ifndef _INTEL_IOMMU_H_
  #define _INTEL_IOMMU_H_
  
  struct iovm_struct {
  	struct omap_iommu	*iommu;	/* iommu object which this belongs to */
  	u32			da_start; /* area definition */
  	u32			da_end;
  	u32			flags; /* IOVMF_: see below */
  	struct list_head	list; /* linked in ascending order */
  	const struct sg_table	*sgt; /* keep 'page' <-> 'da' mapping */
  	void			*va; /* mpu side mapped address */
  };
  
  #define MMU_RAM_ENDIAN_SHIFT	9
  #define MMU_RAM_ENDIAN_LITTLE	(0 << MMU_RAM_ENDIAN_SHIFT)
  #define MMU_RAM_ELSZ_8		(0 << MMU_RAM_ELSZ_SHIFT)
  #define IOVMF_ENDIAN_LITTLE	MMU_RAM_ENDIAN_LITTLE
  #define MMU_RAM_ELSZ_SHIFT	7
  #define IOVMF_ELSZ_8		MMU_RAM_ELSZ_8
  
  struct iommu_domain;
  
  extern struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da);
  extern u32
  omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
  			const struct sg_table *sgt, u32 flags);
  extern struct sg_table *omap_iommu_vunmap(struct iommu_domain *domain,
  				struct device *dev, u32 da);
  extern u32
  omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev,
  				u32 da, size_t bytes, u32 flags);
  extern void
  omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
  				const u32 da);
  extern void *omap_da_to_va(struct device *dev, u32 da);
  
  extern void omap_iommu_save_ctx(struct device *dev);
  extern void omap_iommu_restore_ctx(struct device *dev);
  
  #endif