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