git.oblomov.eu 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_range_for_device(struct device *dev, dma_addr_t dma_handle,
  37                                  unsigned long offset, size_t size,
  38                                  enum dma_data_direction direction)
  39 {
  40         flush_write_buffers();
  41 }
  42
  43 static inline void
  44 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
  45                     enum dma_data_direction direction)
  46 {
  47 }
  48
  49 static inline void
  50 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
  51                     enum dma_data_direction direction)
  52 {
  53         flush_write_buffers();
  54 }
  55
  56 static inline int
  57 dma_mapping_error(dma_addr_t dma_addr)
  58 {
  59         return 0;
  60 }
  61
  62 extern int forbid_dac;
  63
  64 static inline int
  65 dma_supported(struct device *dev, u64 mask)
  66 {
  67         /*
  68          * we fall back to GFP_DMA when the mask isn't all 1s,
  69          * so we can't guarantee allocations that must be
  70          * within a tighter range than GFP_DMA..
  71          */
  72         if(mask < 0x00ffffff)
  73                 return 0;
  74
  75         /* Work around chipset bugs */
  76         if (forbid_dac > 0 && mask > 0xffffffffULL)
  77                 return 0;
  78
  79         return 1;
  80 }
  81
  82 static inline int
  83 dma_set_mask(struct device *dev, u64 mask)
  84 {
  85         if(!dev->dma_mask || !dma_supported(dev, mask))
  86                 return -EIO;
  87
  88         *dev->dma_mask = mask;
  89
  90         return 0;
  91 }
  92
  93 static inline int
  94 dma_get_cache_alignment(void)
  95 {
  96         /* no easy way to get cache size on all x86, so return the
  97          * maximum possible, to be safe */
  98         return (1 << INTERNODE_CACHE_SHIFT);
  99 }
 100
 101 #define dma_is_consistent(d, h) (1)
 102
 103 static inline void
 104 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 105                enum dma_data_direction direction)
 106 {
 107         flush_write_buffers();
 108 }
 109
 110 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 111 extern int
 112 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 113                             dma_addr_t device_addr, size_t size, int flags);
 114
 115 extern void
 116 dma_release_declared_memory(struct device *dev);
 117
 118 extern void *
 119 dma_mark_declared_memory_occupied(struct device *dev,
 120                                   dma_addr_t device_addr, size_t size);
 121
 122 #endif