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- #ifndef _ASM_I386_DMA_MAPPING_H
- #define _ASM_I386_DMA_MAPPING_H
-
- #include <linux/mm.h>
-
- #include <asm/cache.h>
- #include <asm/io.h>
- #include <asm/scatterlist.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)
-
- void *dma_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_handle, int flag);
-
- void dma_free_coherent(struct device *dev, size_t size,
- void *vaddr, dma_addr_t dma_handle);
-
- static inline dma_addr_t
- dma_map_single(struct device *dev, void *ptr, size_t size,
- enum dma_data_direction direction)
- {
- BUG_ON(direction == DMA_NONE);
- flush_write_buffers();
- return virt_to_phys(ptr);
- }
-
- 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);
- }
-
- static inline int
- dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction direction)
- {
- int i;
-
- BUG_ON(direction == DMA_NONE);
-
- for (i = 0; i < nents; i++ ) {
- BUG_ON(!sg[i].page);
-
- sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
- }
-
- flush_write_buffers();
- return nents;
- }
-
- static inline dma_addr_t
- dma_map_page(struct device *dev, struct page *page, unsigned long offset,
- size_t size, enum dma_data_direction direction)
- {
- BUG_ON(direction == DMA_NONE);
- return page_to_phys(page) + offset;
- }
-
- 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_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
- 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)
- {
- /* no easy way to get cache size on all x86, so return the
- * maximum possible, to be safe */
- return (1 << L1_CACHE_SHIFT_MAX);
- }
-
- #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();
- }
-
- #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
- extern int
- dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
- dma_addr_t device_addr, size_t size, int flags);
-
- extern void
- dma_release_declared_memory(struct device *dev);
-
- extern void *
- dma_mark_declared_memory_occupied(struct device *dev,
- dma_addr_t device_addr, size_t size);
-
- #endif
-