| #ifndef ASMARM_DMA_IOMMU_H |
| #define ASMARM_DMA_IOMMU_H |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/mm_types.h> |
| #include <linux/scatterlist.h> |
| #include <linux/dma-debug.h> |
| #include <linux/kmemcheck.h> |
| #include <linux/kref.h> |
| #include <linux/dma-mapping-fast.h> |
| |
| struct dma_iommu_mapping { |
| /* iommu specific data */ |
| struct iommu_domain *domain; |
| bool init; |
| const struct dma_map_ops *ops; |
| unsigned long **bitmaps; /* array of bitmaps */ |
| unsigned int nr_bitmaps; /* nr of elements in array */ |
| unsigned int extensions; |
| size_t bitmap_size; /* size of a single bitmap */ |
| size_t bits; /* per bitmap */ |
| dma_addr_t base; |
| |
| spinlock_t lock; |
| struct kref kref; |
| |
| struct dma_fast_smmu_mapping *fast; |
| }; |
| |
| #ifdef CONFIG_ARM_DMA_USE_IOMMU |
| |
| struct dma_iommu_mapping * |
| arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size); |
| |
| void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping); |
| |
| int arm_iommu_attach_device(struct device *dev, |
| struct dma_iommu_mapping *mapping); |
| void arm_iommu_detach_device(struct device *dev); |
| |
| #else /* !CONFIG_ARM_DMA_USE_IOMMU */ |
| |
| static inline struct dma_iommu_mapping * |
| arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size) |
| { |
| return NULL; |
| } |
| |
| static inline void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping) |
| { |
| } |
| |
| static inline int arm_iommu_attach_device(struct device *dev, |
| struct dma_iommu_mapping *mapping) |
| { |
| return -ENODEV; |
| } |
| |
| static inline void arm_iommu_detach_device(struct device *dev) |
| { |
| } |
| |
| #endif /* CONFIG_ARM_DMA_USE_IOMMU */ |
| |
| #endif /* __KERNEL__ */ |
| #endif |