include/asm-x86/dma-mapping_32.h

   1 #ifndef _ASM_I386_DMA_MAPPING_H
   2 #define _ASM_I386_DMA_MAPPING_H
   3
   4 #include <linux/mm.h>
   5 #include <linux/scatterlist.h>
   6
   7 #include <asm/cache.h>
   8 #include <asm/io.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 *sglist, int nents,
  39            enum dma_data_direction direction)
  40 {
  41         struct scatterlist *sg;
  42         int i;
  43
  44         BUG_ON(!valid_dma_direction(direction));
  45         WARN_ON(nents == 0 || sglist[0].length == 0);
  46
  47         for_each_sg(sglist, sg, nents, i) {
  48                 BUG_ON(!sg_page(sg));
  49
  50                 sg->dma_address = sg_phys(sg);
  51         }
  52
  53         flush_write_buffers();
  54         return nents;
  55 }
  56
  57 static inline dma_addr_t
  58 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  59              size_t size, enum dma_data_direction direction)
  60 {
  61         BUG_ON(!valid_dma_direction(direction));
  62         return page_to_phys(page) + offset;
  63 }
  64
  65 static inline void
  66 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  67                enum dma_data_direction direction)
  68 {
  69         BUG_ON(!valid_dma_direction(direction));
  70 }
  71
  72
  73 static inline void
  74 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  75              enum dma_data_direction direction)
  76 {
  77         BUG_ON(!valid_dma_direction(direction));
  78 }
  79
  80 static inline void
  81 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  82                         enum dma_data_direction direction)
  83 {
  84 }
  85
  86 static inline void
  87 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  88                         enum dma_data_direction direction)
  89 {
  90         flush_write_buffers();
  91 }
  92
  93 static inline void
  94 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  95                               unsigned long offset, size_t size,
  96                               enum dma_data_direction direction)
  97 {
  98 }
  99
 100 static inline void
 101 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 102                                  unsigned long offset, size_t size,
 103                                  enum dma_data_direction direction)
 104 {
 105         flush_write_buffers();
 106 }
 107
 108 static inline void
 109 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 110                     enum dma_data_direction direction)
 111 {
 112 }
 113
 114 static inline void
 115 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 116                     enum dma_data_direction direction)
 117 {
 118         flush_write_buffers();
 119 }
 120
 121 static inline int
 122 dma_mapping_error(dma_addr_t dma_addr)
 123 {
 124         return 0;
 125 }
 126
 127 extern int forbid_dac;
 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         /* Work around chipset bugs */
 141         if (forbid_dac > 0 && mask > 0xffffffffULL)
 142                 return 0;
 143
 144         return 1;
 145 }
 146
 147 static inline int
 148 dma_set_mask(struct device *dev, u64 mask)
 149 {
 150         if(!dev->dma_mask || !dma_supported(dev, mask))
 151                 return -EIO;
 152
 153         *dev->dma_mask = mask;
 154
 155         return 0;
 156 }
 157
 158 static inline int
 159 dma_get_cache_alignment(void)
 160 {
 161         /* no easy way to get cache size on all x86, so return the
 162          * maximum possible, to be safe */
 163         return (1 << INTERNODE_CACHE_SHIFT);
 164 }
 165
 166 #define dma_is_consistent(d, h) (1)
 167
 168 static inline void
 169 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 170                enum dma_data_direction direction)
 171 {
 172         flush_write_buffers();
 173 }
 174
 175 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 176 extern int
 177 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 178                             dma_addr_t device_addr, size_t size, int flags);
 179
 180 extern void
 181 dma_release_declared_memory(struct device *dev);
 182
 183 extern void *
 184 dma_mark_declared_memory_occupied(struct device *dev,
 185                                   dma_addr_t device_addr, size_t size);
 186
 187 #endif