#ifndef _ASM_DMA_MAPPING_H #define _ASM_DMA_MAPPING_H #include <linux/device.h> #include <asm/cache.h> #include <asm/cacheflush.h> #include <asm/scatterlist.h> #include <asm/io.h> #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) extern unsigned long __nongprelbss dma_coherent_mem_start; extern unsigned long __nongprelbss dma_coherent_mem_end; void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, int gfp); void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); /* * These macros should be used after a pci_map_sg call has been done * to get bus addresses of each of the SG entries and their lengths. * You should only work with the number of sg entries pci_map_sg * returns, or alternatively stop on the first sg_dma_len(sg) which * is 0. */ #define sg_dma_address(sg) ((unsigned long) (page_to_phys((sg)->page) + (sg)->offset)) #define sg_dma_len(sg) ((sg)->length) /* * Map a single buffer of the indicated size for DMA in streaming mode. * The 32-bit bus address to use is returned. * * Once the device is given the dma address, the device owns this memory * until either pci_unmap_single or pci_dma_sync_single is performed. */ extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction); /* * Unmap a single streaming mode DMA translation. The dma_addr and size * must match what was provided for in a previous pci_map_single call. All * other usages are undefined. * * After this call, reads by the cpu to the buffer are guarenteed to see * whatever the device wrote there. */ static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); } /* * Map a set of buffers described by scatterlist in streaming * mode for DMA. This is the scather-gather version of the * above pci_map_single interface. Here the scatter gather list * elements are each tagged with the appropriate dma address * and length. They are obtained via sg_dma_{address,length}(SG). * * NOTE: An implementation may be able to use a smaller number of * DMA address/length pairs than there are SG table elements. * (for example via virtual mapping capabilities) * The routine returns the number of addr/length pairs actually * used, at most nents. * * Device ownership issues as mentioned above for pci_map_single are * the same here. */ extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction); /* * Unmap a set of streaming mode DMA translations. * Again, cpu read rules concerning calls here are the same as for * pci_unmap_single() above. */ static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); } extern dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction); static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); } static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) { } static inline void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) { flush_write_buffers(); } static inline void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) { } static inline void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) { flush_write_buffers(); } static inline void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction) { } static inline void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction) { flush_write_buffers(); } static inline int dma_mapping_error(dma_addr_t dma_addr) { return 0; } static inline int dma_supported(struct device *dev, u64 mask) { /* * we fall back to GFP_DMA when the mask isn't all 1s, * so we can't guarantee allocations that must be * within a tighter range than GFP_DMA.. */ if (mask < 0x00ffffff) return 0; return 1; } static inline int dma_set_mask(struct device *dev, u64 mask) { if (!dev->dma_mask || !dma_supported(dev, mask)) return -EIO; *dev->dma_mask = mask; return 0; } static inline int dma_get_cache_alignment(void) { return 1 << L1_CACHE_SHIFT; } #define dma_is_consistent(d) (1) static inline void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction direction) { flush_write_buffers(); } #endif /* _ASM_DMA_MAPPING_H */