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/kmemcheck.h> 11 #include <linux/kref.h> 12 13 #define ARM_MAPPING_ERROR (~(dma_addr_t)0x0) 14 15 struct dma_iommu_mapping { 16 /* iommu specific data */ 17 struct iommu_domain *domain; 18 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 */ 24 dma_addr_t base; 25 26 spinlock_t lock; 27 struct kref kref; 28 }; 29 30 struct dma_iommu_mapping * 31 arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size); 32 33 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping); 34 35 int arm_iommu_attach_device(struct device *dev, 36 struct dma_iommu_mapping *mapping); 37 void arm_iommu_detach_device(struct device *dev); 38 39 int arm_dma_supported(struct device *dev, u64 mask); 40 41 #endif /* __KERNEL__ */ 42 #endif 43