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(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