err.no Git - linux-2.6/blob - 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_page(struct device *dev, struct page *page, unsigned long offset,
  22              size_t size, enum dma_data_direction direction)
  23 {
  24         BUG_ON(!valid_dma_direction(direction));
  25         return page_to_phys(page) + offset;
  26 }
  27
  28 static inline void
  29 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  30                enum dma_data_direction direction)
  31 {
  32         BUG_ON(!valid_dma_direction(direction));
  33 }
  34
  35 static inline void
  36 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  37                         enum dma_data_direction direction)
  38 {
  39 }
  40
  41 static inline void
  42 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  43                         enum dma_data_direction direction)
  44 {
  45         flush_write_buffers();
  46 }
  47
  48 static inline void
  49 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  50                               unsigned long offset, size_t size,
  51                               enum dma_data_direction direction)
  52 {
  53 }
  54
  55 static inline void
  56 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
  57                                  unsigned long offset, size_t size,
  58                                  enum dma_data_direction direction)
  59 {
  60         flush_write_buffers();
  61 }
  62
  63 static inline void
  64 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
  65                     enum dma_data_direction direction)
  66 {
  67 }
  68
  69 static inline void
  70 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
  71                     enum dma_data_direction direction)
  72 {
  73         flush_write_buffers();
  74 }
  75
  76 static inline int
  77 dma_mapping_error(dma_addr_t dma_addr)
  78 {
  79         return 0;
  80 }
  81
  82 extern int forbid_dac;
  83
  84 static inline int
  85 dma_supported(struct device *dev, u64 mask)
  86 {
  87         /*
  88          * we fall back to GFP_DMA when the mask isn't all 1s,
  89          * so we can't guarantee allocations that must be
  90          * within a tighter range than GFP_DMA..
  91          */
  92         if(mask < 0x00ffffff)
  93                 return 0;
  94
  95         /* Work around chipset bugs */
  96         if (forbid_dac > 0 && mask > 0xffffffffULL)
  97                 return 0;
  98
  99         return 1;
 100 }
 101
 102 static inline int
 103 dma_set_mask(struct device *dev, u64 mask)
 104 {
 105         if(!dev->dma_mask || !dma_supported(dev, mask))
 106                 return -EIO;
 107
 108         *dev->dma_mask = mask;
 109
 110         return 0;
 111 }
 112
 113 static inline int
 114 dma_get_cache_alignment(void)
 115 {
 116         /* no easy way to get cache size on all x86, so return the
 117          * maximum possible, to be safe */
 118         return (1 << INTERNODE_CACHE_SHIFT);
 119 }
 120
 121 #define dma_is_consistent(d, h) (1)
 122
 123 static inline void
 124 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 125                enum dma_data_direction direction)
 126 {
 127         flush_write_buffers();
 128 }
 129
 130 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 131 extern int
 132 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 133                             dma_addr_t device_addr, size_t size, int flags);
 134
 135 extern void
 136 dma_release_declared_memory(struct device *dev);
 137
 138 extern void *
 139 dma_mark_declared_memory_occupied(struct device *dev,
 140                                   dma_addr_t device_addr, size_t size);
 141
 142 #endif