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 static inline int
  12 dma_mapping_error(dma_addr_t dma_addr)
  13 {
  14         return 0;
  15 }
  16
  17 extern int forbid_dac;
  18
  19 static inline int
  20 dma_supported(struct device *dev, u64 mask)
  21 {
  22         /*
  23          * we fall back to GFP_DMA when the mask isn't all 1s,
  24          * so we can't guarantee allocations that must be
  25          * within a tighter range than GFP_DMA..
  26          */
  27         if(mask < 0x00ffffff)
  28                 return 0;
  29
  30         /* Work around chipset bugs */
  31         if (forbid_dac > 0 && mask > 0xffffffffULL)
  32                 return 0;
  33
  34         return 1;
  35 }
  36
  37 static inline int
  38 dma_set_mask(struct device *dev, u64 mask)
  39 {
  40         if(!dev->dma_mask || !dma_supported(dev, mask))
  41                 return -EIO;
  42
  43         *dev->dma_mask = mask;
  44
  45         return 0;
  46 }
  47
  48 static inline int
  49 dma_get_cache_alignment(void)
  50 {
  51         /* no easy way to get cache size on all x86, so return the
  52          * maximum possible, to be safe */
  53         return (1 << INTERNODE_CACHE_SHIFT);
  54 }
  55
  56 #define dma_is_consistent(d, h) (1)
  57
  58 static inline void
  59 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  60                enum dma_data_direction direction)
  61 {
  62         flush_write_buffers();
  63 }
  64
  65 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  66 extern int
  67 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  68                             dma_addr_t device_addr, size_t size, int flags);
  69
  70 extern void
  71 dma_release_declared_memory(struct device *dev);
  72
  73 extern void *
  74 dma_mark_declared_memory_occupied(struct device *dev,
  75                                   dma_addr_t device_addr, size_t size);
  76
  77 #endif