kernel/arch/metag/include/asm/dma-mapping.h

   1 #ifndef _ASM_METAG_DMA_MAPPING_H
   2 #define _ASM_METAG_DMA_MAPPING_H
   3
   4 #include <linux/mm.h>
   5
   6 #include <asm/cache.h>
   7 #include <asm/io.h>
   8 #include <linux/scatterlist.h>
   9 #include <asm/bug.h>
  10
  11 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  12 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  13
  14 void *dma_alloc_coherent(struct device *dev, size_t size,
  15                          dma_addr_t *dma_handle, gfp_t flag);
  16
  17 void dma_free_coherent(struct device *dev, size_t size,
  18                        void *vaddr, dma_addr_t dma_handle);
  19
  20 void dma_sync_for_device(void *vaddr, size_t size, int dma_direction);
  21 void dma_sync_for_cpu(void *vaddr, size_t size, int dma_direction);
  22
  23 int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
  24                       void *cpu_addr, dma_addr_t dma_addr, size_t size);
  25
  26 int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,
  27                           void *cpu_addr, dma_addr_t dma_addr, size_t size);
  28
  29 static inline dma_addr_t
  30 dma_map_single(struct device *dev, void *ptr, size_t size,
  31                enum dma_data_direction direction)
  32 {
  33         BUG_ON(!valid_dma_direction(direction));
  34         WARN_ON(size == 0);
  35         dma_sync_for_device(ptr, size, direction);
  36         return virt_to_phys(ptr);
  37 }
  38
  39 static inline void
  40 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  41                  enum dma_data_direction direction)
  42 {
  43         BUG_ON(!valid_dma_direction(direction));
  44         dma_sync_for_cpu(phys_to_virt(dma_addr), size, direction);
  45 }
  46
  47 static inline int
  48 dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
  49            enum dma_data_direction direction)
  50 {
  51         struct scatterlist *sg;
  52         int i;
  53
  54         BUG_ON(!valid_dma_direction(direction));
  55         WARN_ON(nents == 0 || sglist[0].length == 0);
  56
  57         for_each_sg(sglist, sg, nents, i) {
  58                 BUG_ON(!sg_page(sg));
  59
  60                 sg->dma_address = sg_phys(sg);
  61                 dma_sync_for_device(sg_virt(sg), sg->length, direction);
  62         }
  63
  64         return nents;
  65 }
  66
  67 static inline dma_addr_t
  68 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  69              size_t size, enum dma_data_direction direction)
  70 {
  71         BUG_ON(!valid_dma_direction(direction));
  72         dma_sync_for_device((void *)(page_to_phys(page) + offset), size,
  73                             direction);
  74         return page_to_phys(page) + offset;
  75 }
  76
  77 static inline void
  78 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  79                enum dma_data_direction direction)
  80 {
  81         BUG_ON(!valid_dma_direction(direction));
  82         dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
  83 }
  84
  85
  86 static inline void
  87 dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nhwentries,
  88              enum dma_data_direction direction)
  89 {
  90         struct scatterlist *sg;
  91         int i;
  92
  93         BUG_ON(!valid_dma_direction(direction));
  94         WARN_ON(nhwentries == 0 || sglist[0].length == 0);
  95
  96         for_each_sg(sglist, sg, nhwentries, i) {
  97                 BUG_ON(!sg_page(sg));
  98
  99                 sg->dma_address = sg_phys(sg);
 100                 dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
 101         }
 102 }
 103
 104 static inline void
 105 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
 106                         enum dma_data_direction direction)
 107 {
 108         dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);
 109 }
 110
 111 static inline void
 112 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 113                            size_t size, enum dma_data_direction direction)
 114 {
 115         dma_sync_for_device(phys_to_virt(dma_handle), size, direction);
 116 }
 117
 118 static inline void
 119 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 120                               unsigned long offset, size_t size,
 121                               enum dma_data_direction direction)
 122 {
 123         dma_sync_for_cpu(phys_to_virt(dma_handle)+offset, size,
 124                          direction);
 125 }
 126
 127 static inline void
 128 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 129                                  unsigned long offset, size_t size,
 130                                  enum dma_data_direction direction)
 131 {
 132         dma_sync_for_device(phys_to_virt(dma_handle)+offset, size,
 133                             direction);
 134 }
 135
 136 static inline void
 137 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 138                     enum dma_data_direction direction)
 139 {
 140         int i;
 141         for (i = 0; i < nelems; i++, sg++)
 142                 dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
 143 }
 144
 145 static inline void
 146 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 147                        enum dma_data_direction direction)
 148 {
 149         int i;
 150         for (i = 0; i < nelems; i++, sg++)
 151                 dma_sync_for_device(sg_virt(sg), sg->length, direction);
 152 }
 153
 154 static inline int
 155 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 156 {
 157         return 0;
 158 }
 159
 160 #define dma_supported(dev, mask)        (1)
 161
 162 static inline int
 163 dma_set_mask(struct device *dev, u64 mask)
 164 {
 165         if (!dev->dma_mask || !dma_supported(dev, mask))
 166                 return -EIO;
 167
 168         *dev->dma_mask = mask;
 169
 170         return 0;
 171 }
 172
 173 /*
 174  * dma_alloc_noncoherent() returns non-cacheable memory, so there's no need to
 175  * do any flushing here.
 176  */
 177 static inline void
 178 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 179                enum dma_data_direction direction)
 180 {
 181 }
 182
 183 /* drivers/base/dma-mapping.c */
 184 extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 185                                   void *cpu_addr, dma_addr_t dma_addr,
 186                                   size_t size);
 187
 188 #define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
 189
 190 #endif