From 1b0fac45878bb88759eec347c273285195649ff7 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sun, 15 Jul 2007 23:40:26 -0700 Subject: dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs Continuing the work started in 411f0f3edc141a582190d3605cadd1d993abb6df ... This enables code with a dma path, that compiles away, to build without requiring additional code factoring. It also prevents code that calls dma_alloc_coherent and dma_free_coherent from linking whereas previously the code would hit a BUG() at run time. Finally, it allows archs that set !HAS_DMA to delete their asm/dma-mapping.h file. Cc: Cornelia Huck Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: John W. Linville Cc: Kyle McMartin Cc: James Bottomley Cc: Tejun Heo Cc: Jeff Garzik Cc: Cc: Cc: Cc: Signed-off-by: Dan Williams Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-generic/dma-mapping-broken.h | 82 +++++++++++++++++++++++++++----- 1 file changed, 70 insertions(+), 12 deletions(-) (limited to 'include/asm-generic') diff --git a/include/asm-generic/dma-mapping-broken.h b/include/asm-generic/dma-mapping-broken.h index 29413d3d4605..e2468f894d2a 100644 --- a/include/asm-generic/dma-mapping-broken.h +++ b/include/asm-generic/dma-mapping-broken.h @@ -1,24 +1,82 @@ #ifndef _ASM_GENERIC_DMA_MAPPING_H #define _ASM_GENERIC_DMA_MAPPING_H -/* This is used for archs that do not support DMA */ +/* define the dma api to allow compilation but not linking of + * dma dependent code. Code that depends on the dma-mapping + * API needs to set 'depends on HAS_DMA' in its Kconfig + */ -static inline void * +struct scatterlist; + +extern void * dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, - gfp_t flag) -{ - BUG(); - return NULL; -} + gfp_t flag); -static inline void +extern void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, - dma_addr_t dma_handle) -{ - BUG(); -} + dma_addr_t dma_handle); #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 dma_addr_t +dma_map_single(struct device *dev, void *ptr, size_t size, + enum dma_data_direction direction); + +extern void +dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, + enum dma_data_direction direction); + +extern int +dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction direction); + +extern void +dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, + enum dma_data_direction direction); + +extern dma_addr_t +dma_map_page(struct device *dev, struct page *page, unsigned long offset, + size_t size, enum dma_data_direction direction); + +extern void +dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, + enum dma_data_direction direction); + +extern void +dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, + enum dma_data_direction direction); + +extern 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); + +extern void +dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, + enum dma_data_direction direction); + +#define dma_sync_single_for_device dma_sync_single_for_cpu +#define dma_sync_single_range_for_device dma_sync_single_range_for_cpu +#define dma_sync_sg_for_device dma_sync_sg_for_cpu + +extern int +dma_mapping_error(dma_addr_t dma_addr); + +extern int +dma_supported(struct device *dev, u64 mask); + +extern int +dma_set_mask(struct device *dev, u64 mask); + +extern int +dma_get_cache_alignment(void); + +extern int +dma_is_consistent(struct device *dev, dma_addr_t dma_handle); + +extern void +dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction); + #endif /* _ASM_GENERIC_DMA_MAPPING_H */ -- cgit v1.2.2