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 struct dma_iommu_mapping { 13 /* iommu specific data */ 14 struct iommu_domain *domain; 15 16 unsigned long **bitmaps; /* array of bitmaps */ 17 unsigned int nr_bitmaps; /* nr of elements in array */ 18 unsigned int extensions; 19 size_t bitmap_size; /* size of a single bitmap */ 20 size_t bits; /* per bitmap */ 21 dma_addr_t base; 22 23 spinlock_t lock; 24 struct kref kref; 25 }; 26 27 struct dma_iommu_mapping * 28 arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size); 29 30 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping); 31 32 int arm_iommu_attach_device(struct device *dev, 33 struct dma_iommu_mapping *mapping); 34 void arm_iommu_detach_device(struct device *dev); 35 36 #endif /* __KERNEL__ */ 37 #endif 38