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 42