arch/blackfin/include/asm/dma-mapping.h

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later.
   5  */
   6
   7 #ifndef _BLACKFIN_DMA_MAPPING_H
   8 #define _BLACKFIN_DMA_MAPPING_H
   9
  10 #include <asm/cacheflush.h>
  11 struct scatterlist;
  12
  13 void *dma_alloc_coherent(struct device *dev, size_t size,
  14                          dma_addr_t *dma_handle, gfp_t gfp);
  15 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  16                        dma_addr_t dma_handle);
  17
  18 /*
  19  * Now for the API extensions over the pci_ one
  20  */
  21 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  22 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  23 #define dma_supported(d, m)         (1)
  24
  25 static inline int
  26 dma_set_mask(struct device *dev, u64 dma_mask)
  27 {
  28         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
  29                 return -EIO;
  30
  31         *dev->dma_mask = dma_mask;
  32
  33         return 0;
  34 }
  35
  36 static inline int
  37 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  38 {
  39         return 0;
  40 }
  41
  42 extern void
  43 __dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
  44 static inline void
  45 __dma_sync_inline(dma_addr_t addr, size_t size, enum dma_data_direction dir)
  46 {
  47         switch (dir) {
  48         case DMA_NONE:
  49                 BUG();
  50         case DMA_TO_DEVICE:             /* writeback only */
  51                 flush_dcache_range(addr, addr + size);
  52                 break;
  53         case DMA_FROM_DEVICE: /* invalidate only */
  54         case DMA_BIDIRECTIONAL: /* flush and invalidate */
  55                 /* Blackfin has no dedicated invalidate (it includes a flush) */
  56                 invalidate_dcache_range(addr, addr + size);
  57                 break;
  58         }
  59 }
  60 static inline void
  61 _dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
  62 {
  63         if (__builtin_constant_p(dir))
  64                 __dma_sync_inline(addr, size, dir);
  65         else
  66                 __dma_sync(addr, size, dir);
  67 }
  68
  69 static inline dma_addr_t
  70 dma_map_single(struct device *dev, void *ptr, size_t size,
  71                enum dma_data_direction dir)
  72 {
  73         _dma_sync((dma_addr_t)ptr, size, dir);
  74         return (dma_addr_t) ptr;
  75 }
  76
  77 static inline dma_addr_t
  78 dma_map_page(struct device *dev, struct page *page,
  79              unsigned long offset, size_t size,
  80              enum dma_data_direction dir)
  81 {
  82         return dma_map_single(dev, page_address(page) + offset, size, dir);
  83 }
  84
  85 static inline void
  86 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  87                  enum dma_data_direction dir)
  88 {
  89         BUG_ON(!valid_dma_direction(dir));
  90 }
  91
  92 static inline void
  93 dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
  94                enum dma_data_direction dir)
  95 {
  96         dma_unmap_single(dev, dma_addr, size, dir);
  97 }
  98
  99 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 100                       enum dma_data_direction dir);
 101
 102 static inline void
 103 dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 104              int nhwentries, enum dma_data_direction dir)
 105 {
 106         BUG_ON(!valid_dma_direction(dir));
 107 }
 108
 109 static inline void
 110 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
 111                               unsigned long offset, size_t size,
 112                               enum dma_data_direction dir)
 113 {
 114         BUG_ON(!valid_dma_direction(dir));
 115 }
 116
 117 static inline void
 118 dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
 119                                  unsigned long offset, size_t size,
 120                                  enum dma_data_direction dir)
 121 {
 122         _dma_sync(handle + offset, size, dir);
 123 }
 124
 125 static inline void
 126 dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
 127                         enum dma_data_direction dir)
 128 {
 129         dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
 130 }
 131
 132 static inline void
 133 dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
 134                            enum dma_data_direction dir)
 135 {
 136         dma_sync_single_range_for_device(dev, handle, 0, size, dir);
 137 }
 138
 139 static inline void
 140 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
 141                     enum dma_data_direction dir)
 142 {
 143         BUG_ON(!valid_dma_direction(dir));
 144 }
 145
 146 extern void
 147 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 148                        int nents, enum dma_data_direction dir);
 149
 150 static inline void
 151 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 152                enum dma_data_direction dir)
 153 {
 154         _dma_sync((dma_addr_t)vaddr, size, dir);
 155 }
 156
 157 /* drivers/base/dma-mapping.c */
 158 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
 159                            void *cpu_addr, dma_addr_t dma_addr, size_t size);
 160 extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 161                                   void *cpu_addr, dma_addr_t dma_addr,
 162                                   size_t size);
 163
 164 #define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
 165 #define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
 166
 167 #endif                          /* _BLACKFIN_DMA_MAPPING_H */