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  * These macros should be used after a pci_map_sg call has been done
  21  * to get bus addresses of each of the SG entries and their lengths.
  22  * You should only work with the number of sg entries pci_map_sg
  23  * returns, or alternatively stop on the first sg_dma_len(sg) which
  24  * is 0.
  25  */
  26 #define sg_dma_address(sg)      ((sg)->dma_address)
  27 #define sg_dma_len(sg)          ((sg)->length)
  28
  29 /*
  30  * Map a single buffer of the indicated size for DMA in streaming mode.
  31  * The 32-bit bus address to use is returned.
  32  *
  33  * Once the device is given the dma address, the device owns this memory
  34  * until either pci_unmap_single or pci_dma_sync_single is performed.
  35  */
  36 extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
  37                                  enum dma_data_direction direction);
  38
  39 /*
  40  * Unmap a single streaming mode DMA translation.  The dma_addr and size
  41  * must match what was provided for in a previous pci_map_single call.  All
  42  * other usages are undefined.
  43  *
  44  * After this call, reads by the cpu to the buffer are guarenteed to see
  45  * whatever the device wrote there.
  46  */
  47 static inline
  48 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  49                       enum dma_data_direction direction)
  50 {
  51         BUG_ON(direction == DMA_NONE);
  52 }
  53
  54 /*
  55  * Map a set of buffers described by scatterlist in streaming
  56  * mode for DMA.  This is the scather-gather version of the
  57  * above pci_map_single interface.  Here the scatter gather list
  58  * elements are each tagged with the appropriate dma address
  59  * and length.  They are obtained via sg_dma_{address,length}(SG).
  60  *
  61  * NOTE: An implementation may be able to use a smaller number of
  62  *       DMA address/length pairs than there are SG table elements.
  63  *       (for example via virtual mapping capabilities)
  64  *       The routine returns the number of addr/length pairs actually
  65  *       used, at most nents.
  66  *
  67  * Device ownership issues as mentioned above for pci_map_single are
  68  * the same here.
  69  */
  70 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  71                       enum dma_data_direction direction);
  72
  73 /*
  74  * Unmap a set of streaming mode DMA translations.
  75  * Again, cpu read rules concerning calls here are the same as for
  76  * pci_unmap_single() above.
  77  */
  78 static inline
  79 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  80              enum dma_data_direction direction)
  81 {
  82         BUG_ON(direction == DMA_NONE);
  83 }
  84
  85 extern
  86 dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  87                         size_t size, enum dma_data_direction direction);
  88
  89 static inline
  90 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  91                     enum dma_data_direction direction)
  92 {
  93         BUG_ON(direction == DMA_NONE);
  94 }
  95
  96
  97 static inline
  98 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  99                              enum dma_data_direction direction)
 100 {
 101 }
 102
 103 static inline
 104 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 105                                 enum dma_data_direction direction)
 106 {
 107         flush_write_buffers();
 108 }
 109
 110 static inline
 111 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 112                                    unsigned long offset, size_t size,
 113                                    enum dma_data_direction direction)
 114 {
 115 }
 116
 117 static inline
 118 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 119                                       unsigned long offset, size_t size,
 120                                       enum dma_data_direction direction)
 121 {
 122         flush_write_buffers();
 123 }
 124
 125 static inline
 126 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 127                          enum dma_data_direction direction)
 128 {
 129 }
 130
 131 static inline
 132 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 133                             enum dma_data_direction direction)
 134 {
 135         flush_write_buffers();
 136 }
 137
 138 static inline
 139 int dma_mapping_error(dma_addr_t dma_addr)
 140 {
 141         return 0;
 142 }
 143
 144 static inline
 145 int dma_supported(struct device *dev, u64 mask)
 146 {
 147         /*
 148          * we fall back to GFP_DMA when the mask isn't all 1s,
 149          * so we can't guarantee allocations that must be
 150          * within a tighter range than GFP_DMA..
 151          */
 152         if (mask < 0x00ffffff)
 153                 return 0;
 154
 155         return 1;
 156 }
 157
 158 static inline
 159 int dma_set_mask(struct device *dev, u64 mask)
 160 {
 161         if (!dev->dma_mask || !dma_supported(dev, mask))
 162                 return -EIO;
 163
 164         *dev->dma_mask = mask;
 165
 166         return 0;
 167 }
 168
 169 static inline
 170 int dma_get_cache_alignment(void)
 171 {
 172         return 1 << L1_CACHE_SHIFT;
 173 }
 174
 175 #define dma_is_consistent(d)    (1)
 176
 177 static inline
 178 void dma_cache_sync(void *vaddr, size_t size,
 179                     enum dma_data_direction direction)
 180 {
 181         flush_write_buffers();
 182 }
 183
 184 #endif  /* _ASM_DMA_MAPPING_H */