| /* |
| * 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 *sglist, int nents, |
| enum dma_data_direction direction) |
| { |
| int i; |
| struct scatterlist *sg; |
| |
| BUG_ON(direction == DMA_NONE); |
| |
| for_each_sg(sglist, sg, nents, i) { |
| 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 *sglist, int nelems, |
| enum dma_data_direction dir) |
| { |
| int i; |
| struct scatterlist *sg; |
| |
| for_each_sg(sglist, sg, nelems, i) |
| consistent_sync(sg_virt(sg), sg->length, dir); |
| } |
| |
| static inline void |
| dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, |
| int nelems, enum dma_data_direction dir) |
| { |
| int i; |
| struct scatterlist *sg; |
| |
| for_each_sg(sglist, sg, nelems, i) |
| 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 */ |