release/src-rt-6.x.4708/linux/linux-2.6.36/arch/frv/include/asm/dma-mapping.h

   1 #ifndef _ASM_DMA_MAPPING_H
   2 #define _ASM_DMA_MAPPING_H
   3
   4 #include <linux/device.h>
   5 #include <asm/cache.h>
   6 #include <asm/cacheflush.h>
   7 #include <asm/scatterlist.h>
   8 #include <asm/io.h>
   9
  10 /*
  11  * See Documentation/DMA-API.txt for the description of how the
  12  * following DMA API should work.
  13  */
  14
  15 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  16 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  17
  18 extern unsigned long __nongprelbss dma_coherent_mem_start;
  19 extern unsigned long __nongprelbss dma_coherent_mem_end;
  20
  21 void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp);
  22 void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle);
  23
  24 extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
  25                                  enum dma_data_direction direction);
  26
  27 static inline
  28 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  29                       enum dma_data_direction direction)
  30 {
  31         BUG_ON(direction == DMA_NONE);
  32 }
  33
  34 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  35                       enum dma_data_direction direction);
  36
  37 static inline
  38 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  39              enum dma_data_direction direction)
  40 {
  41         BUG_ON(direction == DMA_NONE);
  42 }
  43
  44 extern
  45 dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  46                         size_t size, enum dma_data_direction direction);
  47
  48 static inline
  49 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  50                     enum dma_data_direction direction)
  51 {
  52         BUG_ON(direction == DMA_NONE);
  53 }
  54
  55
  56 static inline
  57 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  58                              enum dma_data_direction direction)
  59 {
  60 }
  61
  62 static inline
  63 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  64                                 enum dma_data_direction direction)
  65 {
  66         flush_write_buffers();
  67 }
  68
  69 static inline
  70 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  71                                    unsigned long offset, size_t size,
  72                                    enum dma_data_direction direction)
  73 {
  74 }
  75
  76 static inline
  77 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
  78                                       unsigned long offset, size_t size,
  79                                       enum dma_data_direction direction)
  80 {
  81         flush_write_buffers();
  82 }
  83
  84 static inline
  85 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
  86                          enum dma_data_direction direction)
  87 {
  88 }
  89
  90 static inline
  91 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
  92                             enum dma_data_direction direction)
  93 {
  94         flush_write_buffers();
  95 }
  96
  97 static inline
  98 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  99 {
 100         return 0;
 101 }
 102
 103 static inline
 104 int dma_supported(struct device *dev, u64 mask)
 105 {
 106         /*
 107          * we fall back to GFP_DMA when the mask isn't all 1s,
 108          * so we can't guarantee allocations that must be
 109          * within a tighter range than GFP_DMA..
 110          */
 111         if (mask < 0x00ffffff)
 112                 return 0;
 113
 114         return 1;
 115 }
 116
 117 static inline
 118 int dma_set_mask(struct device *dev, u64 mask)
 119 {
 120         if (!dev->dma_mask || !dma_supported(dev, mask))
 121                 return -EIO;
 122
 123         *dev->dma_mask = mask;
 124
 125         return 0;
 126 }
 127
 128 static inline
 129 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 130                     enum dma_data_direction direction)
 131 {
 132         flush_write_buffers();
 133 }
 134
 135 #endif  /* _ASM_DMA_MAPPING_H */