/* * include/asm-xtensa/dma-mapping.h * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2003 - 2005 Tensilica Inc. */ #ifndef _XTENSA_DMA_MAPPING_H #define _XTENSA_DMA_MAPPING_H #include <asm/cache.h> #include <asm/io.h> #include <linux/mm.h> #include <linux/scatterlist.h> #define DMA_ERROR_CODE (~(dma_addr_t)0x0) /* * DMA-consistent mapping functions. */ extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long); extern void consistent_free(void*, size_t, dma_addr_t); extern void consistent_sync(void*, size_t, int); #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, gfp_t 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); consistent_sync(ptr, size, direction); 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++, sg++ ) { BUG_ON(!sg_page(sg)); sg->dma_address = sg_phys(sg); consistent_sync(sg_virt(sg), sg->length, direction); } 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 (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + 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) { consistent_sync((void *)bus_to_virt(dma_handle), size, 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) { consistent_sync((void *)bus_to_virt(dma_handle), size, direction); } 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) { consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,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) { consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction); } static inline void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction dir) { int i; for (i = 0; i < nelems; i++, sg++) consistent_sync(sg_virt(sg), sg->length, dir); } static inline void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction dir) { int i; for (i = 0; i < nelems; i++, sg++) consistent_sync(sg_virt(sg), sg->length, dir); } static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { return 0; } static inline int dma_supported(struct device *dev, u64 mask) { 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 void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction) { consistent_sync(vaddr, size, direction); } /* Not supported for now */ static inline int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size) { return -EINVAL; } static inline int dma_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size) { return -EINVAL; } static inline void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag, struct dma_attrs *attrs) { return NULL; } static inline void dma_free_attrs(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs) { } #endif /* _XTENSA_DMA_MAPPING_H */