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         if (direction == DMA_NONE)
  25                 BUG();
  26         WARN_ON(size == 0);
  27         flush_write_buffers();
  28         return virt_to_phys(ptr);
  29 }
  30
  31 static inline void
  32 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  33                  enum dma_data_direction direction)
  34 {
  35         if (direction == DMA_NONE)
  36                 BUG();
  37 }
  38
  39 static inline int
  40 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  41            enum dma_data_direction direction)
  42 {
  43         int i;
  44
  45         if (direction == DMA_NONE)
  46                 BUG();
  47         WARN_ON(nents == 0 || sg[0].length == 0);
  48
  49         for (i = 0; i < nents; i++ ) {
  50                 BUG_ON(!sg[i].page);
  51
  52                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
  53         }
  54
  55         flush_write_buffers();
  56         return nents;
  57 }
  58
  59 static inline dma_addr_t
  60 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  61              size_t size, enum dma_data_direction direction)
  62 {
  63         BUG_ON(direction == DMA_NONE);
  64         return page_to_phys(page) + offset;
  65 }
  66
  67 static inline void
  68 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  69                enum dma_data_direction direction)
  70 {
  71         BUG_ON(direction == DMA_NONE);
  72 }
  73
  74
  75 static inline void
  76 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  77              enum dma_data_direction direction)
  78 {
  79         BUG_ON(direction == DMA_NONE);
  80 }
  81
  82 static inline void
  83 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  84                         enum dma_data_direction direction)
  85 {
  86 }
  87
  88 static inline void
  89 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  90                         enum dma_data_direction direction)
  91 {
  92         flush_write_buffers();
  93 }
  94
  95 static inline void
  96 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  97                               unsigned long offset, size_t size,
  98                               enum dma_data_direction direction)
  99 {
 100 }
 101
 102 static inline void
 103 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 104                                  unsigned long offset, size_t size,
 105                                  enum dma_data_direction direction)
 106 {
 107         flush_write_buffers();
 108 }
 109
 110 static inline void
 111 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 112                     enum dma_data_direction direction)
 113 {
 114 }
 115
 116 static inline void
 117 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 118                     enum dma_data_direction direction)
 119 {
 120         flush_write_buffers();
 121 }
 122
 123 static inline int
 124 dma_mapping_error(dma_addr_t dma_addr)
 125 {
 126         return 0;
 127 }
 128
 129 static inline int
 130 dma_supported(struct device *dev, u64 mask)
 131 {
 132         /*
 133          * we fall back to GFP_DMA when the mask isn't all 1s,
 134          * so we can't guarantee allocations that must be
 135          * within a tighter range than GFP_DMA..
 136          */
 137         if(mask < 0x00ffffff)
 138                 return 0;
 139
 140         return 1;
 141 }
 142
 143 static inline int
 144 dma_set_mask(struct device *dev, u64 mask)
 145 {
 146         if(!dev->dma_mask || !dma_supported(dev, mask))
 147                 return -EIO;
 148
 149         *dev->dma_mask = mask;
 150
 151         return 0;
 152 }
 153
 154 static inline int
 155 dma_get_cache_alignment(void)
 156 {
 157         /* no easy way to get cache size on all x86, so return the
 158          * maximum possible, to be safe */
 159         return (1 << INTERNODE_CACHE_SHIFT);
 160 }
 161
 162 #define dma_is_consistent(d)    (1)
 163
 164 static inline void
 165 dma_cache_sync(void *vaddr, size_t size,
 166                enum dma_data_direction direction)
 167 {
 168         flush_write_buffers();
 169 }
 170
 171 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 172 extern int
 173 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 174                             dma_addr_t device_addr, size_t size, int flags);
 175
 176 extern void
 177 dma_release_declared_memory(struct device *dev);
 178
 179 extern void *
 180 dma_mark_declared_memory_occupied(struct device *dev,
 181                                   dma_addr_t device_addr, size_t size);
 182
 183 #endif