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

   1 /*
   2  * include/asm-xtensa/dma-mapping.h
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2003 - 2005 Tensilica Inc.
   9  */
  10
  11 #ifndef _XTENSA_DMA_MAPPING_H
  12 #define _XTENSA_DMA_MAPPING_H
  13
  14 #include <asm/cache.h>
  15 #include <asm/io.h>
  16 #include <linux/mm.h>
  17 #include <linux/scatterlist.h>
  18
  19 #define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
  20
  21 /*
  22  * DMA-consistent mapping functions.
  23  */
  24
  25 extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long);
  26 extern void consistent_free(void*, size_t, dma_addr_t);
  27 extern void consistent_sync(void*, size_t, int);
  28
  29 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  30 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  31
  32 void *dma_alloc_coherent(struct device *dev, size_t size,
  33                            dma_addr_t *dma_handle, gfp_t flag);
  34
  35 void dma_free_coherent(struct device *dev, size_t size,
  36                          void *vaddr, dma_addr_t dma_handle);
  37
  38 static inline dma_addr_t
  39 dma_map_single(struct device *dev, void *ptr, size_t size,
  40                enum dma_data_direction direction)
  41 {
  42         BUG_ON(direction == DMA_NONE);
  43         consistent_sync(ptr, size, direction);
  44         return virt_to_phys(ptr);
  45 }
  46
  47 static inline void
  48 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 static inline int
  55 dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
  56            enum dma_data_direction direction)
  57 {
  58         int i;
  59         struct scatterlist *sg;
  60
  61         BUG_ON(direction == DMA_NONE);
  62
  63         for_each_sg(sglist, sg, nents, i) {
  64                 BUG_ON(!sg_page(sg));
  65
  66                 sg->dma_address = sg_phys(sg);
  67                 consistent_sync(sg_virt(sg), sg->length, direction);
  68         }
  69
  70         return nents;
  71 }
  72
  73 static inline dma_addr_t
  74 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  75              size_t size, enum dma_data_direction direction)
  76 {
  77         BUG_ON(direction == DMA_NONE);
  78         return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
  79 }
  80
  81 static inline void
  82 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  83                enum dma_data_direction direction)
  84 {
  85         BUG_ON(direction == DMA_NONE);
  86 }
  87
  88
  89 static inline void
  90 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  91              enum dma_data_direction direction)
  92 {
  93         BUG_ON(direction == DMA_NONE);
  94 }
  95
  96 static inline void
  97 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  98                 enum dma_data_direction direction)
  99 {
 100         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
 101 }
 102
 103 static inline void
 104 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 105                            size_t size, enum dma_data_direction direction)
 106 {
 107         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
 108 }
 109
 110 static inline void
 111 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         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
 117 }
 118
 119 static inline void
 120 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 121                       unsigned long offset, size_t size,
 122                       enum dma_data_direction direction)
 123 {
 124
 125         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
 126 }
 127 static inline void
 128 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nelems,
 129                  enum dma_data_direction dir)
 130 {
 131         int i;
 132         struct scatterlist *sg;
 133
 134         for_each_sg(sglist, sg, nelems, i)
 135                 consistent_sync(sg_virt(sg), sg->length, dir);
 136 }
 137
 138 static inline void
 139 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
 140                        int nelems, enum dma_data_direction dir)
 141 {
 142         int i;
 143         struct scatterlist *sg;
 144
 145         for_each_sg(sglist, sg, nelems, i)
 146                 consistent_sync(sg_virt(sg), sg->length, dir);
 147 }
 148 static inline int
 149 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 150 {
 151         return 0;
 152 }
 153
 154 static inline int
 155 dma_supported(struct device *dev, u64 mask)
 156 {
 157         return 1;
 158 }
 159
 160 static inline int
 161 dma_set_mask(struct device *dev, u64 mask)
 162 {
 163         if(!dev->dma_mask || !dma_supported(dev, mask))
 164                 return -EIO;
 165
 166         *dev->dma_mask = mask;
 167
 168         return 0;
 169 }
 170
 171 static inline void
 172 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 173                enum dma_data_direction direction)
 174 {
 175         consistent_sync(vaddr, size, direction);
 176 }
 177
 178 /* Not supported for now */
 179 static inline int dma_mmap_coherent(struct device *dev,
 180                                     struct vm_area_struct *vma, void *cpu_addr,
 181                                     dma_addr_t dma_addr, size_t size)
 182 {
 183         return -EINVAL;
 184 }
 185
 186 static inline int dma_get_sgtable(struct device *dev, struct sg_table *sgt,
 187                                   void *cpu_addr, dma_addr_t dma_addr,
 188                                   size_t size)
 189 {
 190         return -EINVAL;
 191 }
 192
 193 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 194                                     dma_addr_t *dma_handle, gfp_t flag,
 195                                     struct dma_attrs *attrs)
 196 {
 197         return NULL;
 198 }
 199
 200 static inline void dma_free_attrs(struct device *dev, size_t size,
 201                                   void *vaddr, dma_addr_t dma_handle,
 202                                   struct dma_attrs *attrs)
 203 {
 204 }
 205
 206 #endif  /* _XTENSA_DMA_MAPPING_H */