include/asm-i386/dma-mapping.h

   1 #ifndef _ASM_I386_DMA_MAPPING_H
   2 #define _ASM_I386_DMA_MAPPING_H
   3
   4 #include <linux/mm.h>
   5
   6 #include <asm/cache.h>
   7 #include <asm/io.h>
   8 #include <asm/scatterlist.h>
   9
  10 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  11 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  12
  13 void *dma_alloc_coherent(struct device *dev, size_t size,
  14                            dma_addr_t *dma_handle, gfp_t flag);
  15
  16 void dma_free_coherent(struct device *dev, size_t size,
  17                          void *vaddr, dma_addr_t dma_handle);
  18
  19 static inline dma_addr_t
  20 dma_map_single(struct device *dev, void *ptr, size_t size,
  21                enum dma_data_direction direction)
  22 {
  23         BUG_ON(direction == DMA_NONE);
  24         flush_write_buffers();
  25         return virt_to_phys(ptr);
  26 }
  27
  28 static inline void
  29 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  30                  enum dma_data_direction direction)
  31 {
  32         BUG_ON(direction == DMA_NONE);
  33 }
  34
  35 static inline int
  36 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  37            enum dma_data_direction direction)
  38 {
  39         int i;
  40
  41         BUG_ON(direction == DMA_NONE);
  42
  43         for (i = 0; i < nents; i++ ) {
  44                 BUG_ON(!sg[i].page);
  45
  46                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
  47         }
  48
  49         flush_write_buffers();
  50         return nents;
  51 }
  52
  53 static inline dma_addr_t
  54 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  55              size_t size, enum dma_data_direction direction)
  56 {
  57         BUG_ON(direction == DMA_NONE);
  58         return page_to_phys(page) + offset;
  59 }
  60
  61 static inline void
  62 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  63                enum dma_data_direction direction)
  64 {
  65         BUG_ON(direction == DMA_NONE);
  66 }
  67
  68
  69 static inline void
  70 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  71              enum dma_data_direction direction)
  72 {
  73         BUG_ON(direction == DMA_NONE);
  74 }
  75
  76 static inline void
  77 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  78                         enum dma_data_direction direction)
  79 {
  80 }
  81
  82 static inline void
  83 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  84                         enum dma_data_direction direction)
  85 {
  86         flush_write_buffers();
  87 }
  88
  89 static inline void
  90 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  91                               unsigned long offset, size_t size,
  92                               enum dma_data_direction direction)
  93 {
  94 }
  95
  96 static inline void
  97 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
  98                                  unsigned long offset, size_t size,
  99                                  enum dma_data_direction direction)
 100 {
 101         flush_write_buffers();
 102 }
 103
 104 static inline void
 105 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 106                     enum dma_data_direction direction)
 107 {
 108 }
 109
 110 static inline void
 111 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 112                     enum dma_data_direction direction)
 113 {
 114         flush_write_buffers();
 115 }
 116
 117 static inline int
 118 dma_mapping_error(dma_addr_t dma_addr)
 119 {
 120         return 0;
 121 }
 122
 123 static inline int
 124 dma_supported(struct device *dev, u64 mask)
 125 {
 126         /*
 127          * we fall back to GFP_DMA when the mask isn't all 1s,
 128          * so we can't guarantee allocations that must be
 129          * within a tighter range than GFP_DMA..
 130          */
 131         if(mask < 0x00ffffff)
 132                 return 0;
 133
 134         return 1;
 135 }
 136
 137 static inline int
 138 dma_set_mask(struct device *dev, u64 mask)
 139 {
 140         if(!dev->dma_mask || !dma_supported(dev, mask))
 141                 return -EIO;
 142
 143         *dev->dma_mask = mask;
 144
 145         return 0;
 146 }
 147
 148 static inline int
 149 dma_get_cache_alignment(void)
 150 {
 151         /* no easy way to get cache size on all x86, so return the
 152          * maximum possible, to be safe */
 153         return (1 << L1_CACHE_SHIFT_MAX);
 154 }
 155
 156 #define dma_is_consistent(d)    (1)
 157
 158 static inline void
 159 dma_cache_sync(void *vaddr, size_t size,
 160                enum dma_data_direction direction)
 161 {
 162         flush_write_buffers();
 163 }
 164
 165 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 166 extern int
 167 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 168                             dma_addr_t device_addr, size_t size, int flags);
 169
 170 extern void
 171 dma_release_declared_memory(struct device *dev);
 172
 173 extern void *
 174 dma_mark_declared_memory_occupied(struct device *dev,
 175                                   dma_addr_t device_addr, size_t size);
 176
 177 #endif