release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/include/asm/dma-mapping.h

   1 #ifndef __ASM_SH_DMA_MAPPING_H
   2 #define __ASM_SH_DMA_MAPPING_H
   3
   4 extern struct dma_map_ops *dma_ops;
   5 extern void no_iommu_init(void);
   6
   7 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
   8 {
   9         return dma_ops;
  10 }
  11
  12 #include <asm-generic/dma-coherent.h>
  13 #include <asm-generic/dma-mapping-common.h>
  14
  15 static inline int dma_supported(struct device *dev, u64 mask)
  16 {
  17         struct dma_map_ops *ops = get_dma_ops(dev);
  18
  19         if (ops->dma_supported)
  20                 return ops->dma_supported(dev, mask);
  21
  22         return 1;
  23 }
  24
  25 static inline int dma_set_mask(struct device *dev, u64 mask)
  26 {
  27         struct dma_map_ops *ops = get_dma_ops(dev);
  28
  29         if (!dev->dma_mask || !dma_supported(dev, mask))
  30                 return -EIO;
  31         if (ops->set_dma_mask)
  32                 return ops->set_dma_mask(dev, mask);
  33
  34         *dev->dma_mask = mask;
  35
  36         return 0;
  37 }
  38
  39 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  40                     enum dma_data_direction dir);
  41
  42 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  43 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  44
  45 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  46 {
  47         struct dma_map_ops *ops = get_dma_ops(dev);
  48
  49         if (ops->mapping_error)
  50                 return ops->mapping_error(dev, dma_addr);
  51
  52         return dma_addr == 0;
  53 }
  54
  55 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
  56                                        dma_addr_t *dma_handle, gfp_t gfp)
  57 {
  58         struct dma_map_ops *ops = get_dma_ops(dev);
  59         void *memory;
  60
  61         if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
  62                 return memory;
  63         if (!ops->alloc_coherent)
  64                 return NULL;
  65
  66         memory = ops->alloc_coherent(dev, size, dma_handle, gfp);
  67         debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
  68
  69         return memory;
  70 }
  71
  72 static inline void dma_free_coherent(struct device *dev, size_t size,
  73                                      void *vaddr, dma_addr_t dma_handle)
  74 {
  75         struct dma_map_ops *ops = get_dma_ops(dev);
  76
  77         if (dma_release_from_coherent(dev, get_order(size), vaddr))
  78                 return;
  79
  80         debug_dma_free_coherent(dev, size, vaddr, dma_handle);
  81         if (ops->free_coherent)
  82                 ops->free_coherent(dev, size, vaddr, dma_handle);
  83 }
  84
  85 /* arch/sh/mm/consistent.c */
  86 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
  87                                         dma_addr_t *dma_addr, gfp_t flag);
  88 extern void dma_generic_free_coherent(struct device *dev, size_t size,
  89                                       void *vaddr, dma_addr_t dma_handle);
  90
  91 #endif /* __ASM_SH_DMA_MAPPING_H */