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

   1 /* DMA mapping. Nothing tricky here, just virt_to_phys */
   2
   3 #ifndef _ASM_CRIS_DMA_MAPPING_H
   4 #define _ASM_CRIS_DMA_MAPPING_H
   5
   6 #include <linux/mm.h>
   7 #include <linux/kernel.h>
   8
   9 #include <asm/cache.h>
  10 #include <asm/io.h>
  11 #include <asm/scatterlist.h>
  12
  13 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  14 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  15
  16 #ifdef CONFIG_PCI
  17 #include <asm-generic/dma-coherent.h>
  18
  19 void *dma_alloc_coherent(struct device *dev, size_t size,
  20                            dma_addr_t *dma_handle, gfp_t flag);
  21
  22 void dma_free_coherent(struct device *dev, size_t size,
  23                          void *vaddr, dma_addr_t dma_handle);
  24 #else
  25 static inline void *
  26 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
  27                    gfp_t flag)
  28 {
  29         BUG();
  30         return NULL;
  31 }
  32
  33 static inline void
  34 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
  35                     dma_addr_t dma_handle)
  36 {
  37         BUG();
  38 }
  39 #endif
  40 static inline dma_addr_t
  41 dma_map_single(struct device *dev, void *ptr, size_t size,
  42                enum dma_data_direction direction)
  43 {
  44         BUG_ON(direction == DMA_NONE);
  45         return virt_to_phys(ptr);
  46 }
  47
  48 static inline void
  49 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  50                  enum dma_data_direction direction)
  51 {
  52         BUG_ON(direction == DMA_NONE);
  53 }
  54
  55 static inline int
  56 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  57            enum dma_data_direction direction)
  58 {
  59         printk("Map sg\n");
  60         return nents;
  61 }
  62
  63 static inline dma_addr_t
  64 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  65              size_t size, enum dma_data_direction direction)
  66 {
  67         BUG_ON(direction == DMA_NONE);
  68         return page_to_phys(page) + offset;
  69 }
  70
  71 static inline void
  72 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  73                enum dma_data_direction direction)
  74 {
  75         BUG_ON(direction == DMA_NONE);
  76 }
  77
  78
  79 static inline void
  80 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  81              enum dma_data_direction direction)
  82 {
  83         BUG_ON(direction == DMA_NONE);
  84 }
  85
  86 static inline void
  87 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  88                         enum dma_data_direction direction)
  89 {
  90 }
  91
  92 static inline void
  93 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  94                         enum dma_data_direction direction)
  95 {
  96 }
  97
  98 static inline void
  99 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 100                               unsigned long offset, size_t size,
 101                               enum dma_data_direction direction)
 102 {
 103 }
 104
 105 static inline void
 106 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 107                                  unsigned long offset, size_t size,
 108                                  enum dma_data_direction direction)
 109 {
 110 }
 111
 112 static inline void
 113 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 114                     enum dma_data_direction direction)
 115 {
 116 }
 117
 118 static inline void
 119 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 120                     enum dma_data_direction direction)
 121 {
 122 }
 123
 124 static inline int
 125 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 126 {
 127         return 0;
 128 }
 129
 130 static inline int
 131 dma_supported(struct device *dev, u64 mask)
 132 {
 133         /*
 134          * we fall back to GFP_DMA when the mask isn't all 1s,
 135          * so we can't guarantee allocations that must be
 136          * within a tighter range than GFP_DMA..
 137          */
 138         if(mask < 0x00ffffff)
 139                 return 0;
 140
 141         return 1;
 142 }
 143
 144 static inline int
 145 dma_set_mask(struct device *dev, u64 mask)
 146 {
 147         if(!dev->dma_mask || !dma_supported(dev, mask))
 148                 return -EIO;
 149
 150         *dev->dma_mask = mask;
 151
 152         return 0;
 153 }
 154
 155 static inline void
 156 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 157                enum dma_data_direction direction)
 158 {
 159 }
 160
 161
 162 #endif