include/asm-frv/dma-mapping.h

   1 #ifndef _ASM_DMA_MAPPING_H
   2 #define _ASM_DMA_MAPPING_H
   3
   4 #include <linux/device.h>
   5 #include <asm/cache.h>
   6 #include <asm/cacheflush.h>
   7 #include <asm/scatterlist.h>
   8 #include <asm/io.h>
   9
  10 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  11 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  12
  13 extern unsigned long __nongprelbss dma_coherent_mem_start;
  14 extern unsigned long __nongprelbss dma_coherent_mem_end;
  15
  16 void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp);
  17 void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle);
  18
  19 /*
  20  * Map a single buffer of the indicated size for DMA in streaming mode.
  21  * The 32-bit bus address to use is returned.
  22  *
  23  * Once the device is given the dma address, the device owns this memory
  24  * until either pci_unmap_single or pci_dma_sync_single is performed.
  25  */
  26 extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
  27                                  enum dma_data_direction direction);
  28
  29 /*
  30  * Unmap a single streaming mode DMA translation.  The dma_addr and size
  31  * must match what was provided for in a previous pci_map_single call.  All
  32  * other usages are undefined.
  33  *
  34  * After this call, reads by the cpu to the buffer are guarenteed to see
  35  * whatever the device wrote there.
  36  */
  37 static inline
  38 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  39                       enum dma_data_direction direction)
  40 {
  41         BUG_ON(direction == DMA_NONE);
  42 }
  43
  44 /*
  45  * Map a set of buffers described by scatterlist in streaming
  46  * mode for DMA.  This is the scather-gather version of the
  47  * above pci_map_single interface.  Here the scatter gather list
  48  * elements are each tagged with the appropriate dma address
  49  * and length.  They are obtained via sg_dma_{address,length}(SG).
  50  *
  51  * NOTE: An implementation may be able to use a smaller number of
  52  *       DMA address/length pairs than there are SG table elements.
  53  *       (for example via virtual mapping capabilities)
  54  *       The routine returns the number of addr/length pairs actually
  55  *       used, at most nents.
  56  *
  57  * Device ownership issues as mentioned above for pci_map_single are
  58  * the same here.
  59  */
  60 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  61                       enum dma_data_direction direction);
  62
  63 /*
  64  * Unmap a set of streaming mode DMA translations.
  65  * Again, cpu read rules concerning calls here are the same as for
  66  * pci_unmap_single() above.
  67  */
  68 static inline
  69 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  70              enum dma_data_direction direction)
  71 {
  72         BUG_ON(direction == DMA_NONE);
  73 }
  74
  75 extern
  76 dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  77                         size_t size, enum dma_data_direction direction);
  78
  79 static inline
  80 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  81                     enum dma_data_direction direction)
  82 {
  83         BUG_ON(direction == DMA_NONE);
  84 }
  85
  86
  87 static inline
  88 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  89                              enum dma_data_direction direction)
  90 {
  91 }
  92
  93 static inline
  94 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  95                                 enum dma_data_direction direction)
  96 {
  97         flush_write_buffers();
  98 }
  99
 100 static inline
 101 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 102                                    unsigned long offset, size_t size,
 103                                    enum dma_data_direction direction)
 104 {
 105 }
 106
 107 static inline
 108 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 109                                       unsigned long offset, size_t size,
 110                                       enum dma_data_direction direction)
 111 {
 112         flush_write_buffers();
 113 }
 114
 115 static inline
 116 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 117                          enum dma_data_direction direction)
 118 {
 119 }
 120
 121 static inline
 122 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 123                             enum dma_data_direction direction)
 124 {
 125         flush_write_buffers();
 126 }
 127
 128 static inline
 129 int dma_mapping_error(dma_addr_t dma_addr)
 130 {
 131         return 0;
 132 }
 133
 134 static inline
 135 int dma_supported(struct device *dev, u64 mask)
 136 {
 137         /*
 138          * we fall back to GFP_DMA when the mask isn't all 1s,
 139          * so we can't guarantee allocations that must be
 140          * within a tighter range than GFP_DMA..
 141          */
 142         if (mask < 0x00ffffff)
 143                 return 0;
 144
 145         return 1;
 146 }
 147
 148 static inline
 149 int dma_set_mask(struct device *dev, u64 mask)
 150 {
 151         if (!dev->dma_mask || !dma_supported(dev, mask))
 152                 return -EIO;
 153
 154         *dev->dma_mask = mask;
 155
 156         return 0;
 157 }
 158
 159 static inline
 160 int dma_get_cache_alignment(void)
 161 {
 162         return 1 << L1_CACHE_SHIFT;
 163 }
 164
 165 #define dma_is_consistent(d, h) (1)
 166
 167 static inline
 168 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 169                     enum dma_data_direction direction)
 170 {
 171         flush_write_buffers();
 172 }
 173
 174 #endif  /* _ASM_DMA_MAPPING_H */