arch/arm/include/asm/dma-iommu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ASMARM_DMA_IOMMU_H
   3 #define ASMARM_DMA_IOMMU_H
   4
   5 #ifdef __KERNEL__
   6
   7 #include <linux/mm_types.h>
   8 #include <linux/scatterlist.h>
   9 #include <linux/dma-debug.h>
  10 #include <linux/kref.h>
  11
  12 #define ARM_MAPPING_ERROR               (~(dma_addr_t)0x0)
  13
  14 struct dma_iommu_mapping {
  15         /* iommu specific data */
  16         struct iommu_domain     *domain;
  17
  18         unsigned long           **bitmaps;      /* array of bitmaps */
  19         unsigned int            nr_bitmaps;     /* nr of elements in array */
  20         unsigned int            extensions;
  21         size_t                  bitmap_size;    /* size of a single bitmap */
  22         size_t                  bits;           /* per bitmap */
  23         dma_addr_t              base;
  24
  25         spinlock_t              lock;
  26         struct kref             kref;
  27 };
  28
  29 struct dma_iommu_mapping *
  30 arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size);
  31
  32 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
  33
  34 int arm_iommu_attach_device(struct device *dev,
  35                                         struct dma_iommu_mapping *mapping);
  36 void arm_iommu_detach_device(struct device *dev);
  37
  38 int arm_dma_supported(struct device *dev, u64 mask);
  39
  40 #endif /* __KERNEL__ */
  41 #endif