include/asm-i386/dma-mapping.h

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