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/kref.h>
10
11 struct dma_iommu_mapping {
12 /* iommu specific data */
13 struct iommu_domain *domain;
14
15 unsigned long **bitmaps; /* array of bitmaps */
16 unsigned int nr_bitmaps; /* nr of elements in array */
17 unsigned int extensions;
18 size_t bitmap_size; /* size of a single bitmap */
19 size_t bits; /* per bitmap */
20 dma_addr_t base;
21
22 spinlock_t lock;
23 struct kref kref;
24 };
25
26 struct dma_iommu_mapping *
27 arm_iommu_create_mapping(const struct bus_type *bus, dma_addr_t base, u64 size);
28
29 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
30
31 int arm_iommu_attach_device(struct device *dev,
32 struct dma_iommu_mapping *mapping);
33 void arm_iommu_detach_device(struct device *dev);
34
35 #endif /* __KERNEL__ */
36 #endif
37
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