#ifndef ASMARM_DMA_IOMMU_H #define ASMARM_DMA_IOMMU_H #ifdef __KERNEL__ #include #include #include #include #include struct dma_iommu_mapping { /* iommu specific data */ struct iommu_domain *domain; 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; }; #ifdef CONFIG_ARM_DMA_USE_IOMMU struct dma_iommu_mapping * arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t 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