include/linux/omap-iommu.h

   1 /*
   2  * omap iommu: simple virtual address space management
   3  *
   4  * Copyright (C) 2008-2009 Nokia Corporation
   5  *
   6  * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #ifndef _INTEL_IOMMU_H_
  14 #define _INTEL_IOMMU_H_
  15
  16 struct iovm_struct {
  17         struct omap_iommu       *iommu; /* iommu object which this belongs to */
  18         u32                     da_start; /* area definition */
  19         u32                     da_end;
  20         u32                     flags; /* IOVMF_: see below */
  21         struct list_head        list; /* linked in ascending order */
  22         const struct sg_table   *sgt; /* keep 'page' <-> 'da' mapping */
  23         void                    *va; /* mpu side mapped address */
  24 };
  25
  26 #define MMU_RAM_ENDIAN_SHIFT    9
  27 #define MMU_RAM_ENDIAN_LITTLE   (0 << MMU_RAM_ENDIAN_SHIFT)
  28 #define MMU_RAM_ELSZ_8          (0 << MMU_RAM_ELSZ_SHIFT)
  29 #define IOVMF_ENDIAN_LITTLE     MMU_RAM_ENDIAN_LITTLE
  30 #define MMU_RAM_ELSZ_SHIFT      7
  31 #define IOVMF_ELSZ_8            MMU_RAM_ELSZ_8
  32
  33 struct iommu_domain;
  34
  35 extern struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da);
  36 extern u32
  37 omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
  38                         const struct sg_table *sgt, u32 flags);
  39 extern struct sg_table *omap_iommu_vunmap(struct iommu_domain *domain,
  40                                 struct device *dev, u32 da);
  41 extern u32
  42 omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev,
  43                                 u32 da, size_t bytes, u32 flags);
  44 extern void
  45 omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
  46                                 const u32 da);
  47 extern void *omap_da_to_va(struct device *dev, u32 da);
  48
  49 extern void omap_iommu_save_ctx(struct device *dev);
  50 extern void omap_iommu_restore_ctx(struct device *dev);
  51
  52 #endif