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 #include <asm/bug.h>
  10
  11 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  12 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  13
  14 void *dma_alloc_coherent(struct device *dev, size_t size,
  15                            dma_addr_t *dma_handle, gfp_t flag);
  16
  17 void dma_free_coherent(struct device *dev, size_t size,
  18                          void *vaddr, dma_addr_t dma_handle);
  19
  20 static inline dma_addr_t
  21 dma_map_single(struct device *dev, void *ptr, size_t size,
  22                enum dma_data_direction direction)
  23 {
  24         BUG_ON(!valid_dma_direction(direction));
  25         WARN_ON(size == 0);
  26         flush_write_buffers();
  27         return virt_to_phys(ptr);
  28 }
  29
  30 static inline void
  31 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  32                  enum dma_data_direction direction)
  33 {
  34         BUG_ON(!valid_dma_direction(direction));
  35 }
  36
  37 static inline int
  38 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  39            enum dma_data_direction direction)
  40 {
  41         int i;
  42
  43         BUG_ON(!valid_dma_direction(direction));
  44         WARN_ON(nents == 0 || sg[0].length == 0);
  45
  46         for (i = 0; i < nents; i++ ) {
  47                 BUG_ON(!sg[i].page);
  48
  49                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
  50         }
  51
  52         flush_write_buffers();
  53         return nents;
  54 }
  55
  56 static inline dma_addr_t
  57 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  58              size_t size, enum dma_data_direction direction)
  59 {
  60         BUG_ON(!valid_dma_direction(direction));
  61         return page_to_phys(page) + offset;
  62 }
  63
  64 static inline void
  65 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  66                enum dma_data_direction direction)
  67 {
  68         BUG_ON(!valid_dma_direction(direction));
  69 }
  70
  71
  72 static inline void
  73 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  74              enum dma_data_direction direction)
  75 {
  76         BUG_ON(!valid_dma_direction(direction));
  77 }
  78
  79 static inline void
  80 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  81                         enum dma_data_direction direction)
  82 {
  83 }
  84
  85 static inline void
  86 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  87                         enum dma_data_direction direction)
  88 {
  89         flush_write_buffers();
  90 }
  91
  92 static inline void
  93 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  94                               unsigned long offset, size_t size,
  95                               enum dma_data_direction direction)
  96 {
  97 }
  98
  99 static inline void
 100 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 101                                  unsigned long offset, size_t size,
 102                                  enum dma_data_direction direction)
 103 {
 104         flush_write_buffers();
 105 }
 106
 107 static inline void
 108 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 109                     enum dma_data_direction direction)
 110 {
 111 }
 112
 113 static inline void
 114 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 115                     enum dma_data_direction direction)
 116 {
 117         flush_write_buffers();
 118 }
 119
 120 static inline int
 121 dma_mapping_error(dma_addr_t dma_addr)
 122 {
 123         return 0;
 124 }
 125
 126 static inline int
 127 dma_supported(struct device *dev, u64 mask)
 128 {
 129         /*
 130          * we fall back to GFP_DMA when the mask isn't all 1s,
 131          * so we can't guarantee allocations that must be
 132          * within a tighter range than GFP_DMA..
 133          */
 134         if(mask < 0x00ffffff)
 135                 return 0;
 136
 137         return 1;
 138 }
 139
 140 static inline int
 141 dma_set_mask(struct device *dev, u64 mask)
 142 {
 143         if(!dev->dma_mask || !dma_supported(dev, mask))
 144                 return -EIO;
 145
 146         *dev->dma_mask = mask;
 147
 148         return 0;
 149 }
 150
 151 static inline int
 152 dma_get_cache_alignment(void)
 153 {
 154         /* no easy way to get cache size on all x86, so return the
 155          * maximum possible, to be safe */
 156         return (1 << INTERNODE_CACHE_SHIFT);
 157 }
 158
 159 #define dma_is_consistent(d, h) (1)
 160
 161 static inline void
 162 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 163                enum dma_data_direction direction)
 164 {
 165         flush_write_buffers();
 166 }
 167
 168 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 169 extern int
 170 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 171                             dma_addr_t device_addr, size_t size, int flags);
 172
 173 extern void
 174 dma_release_declared_memory(struct device *dev);
 175
 176 extern void *
 177 dma_mark_declared_memory_occupied(struct device *dev,
 178                                   dma_addr_t device_addr, size_t size);
 179
 180 #endif