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   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/scatterlist.h>
  15 #include <asm/cache.h>
  16 #include <asm/io.h>
  17 #include <linux/mm.h>
  18
  19 /*
  20  * DMA-consistent mapping functions.
  21  */
  22
  23 extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long);
  24 extern void consistent_free(void*, size_t, dma_addr_t);
  25 extern void consistent_sync(void*, size_t, int);
  26
  27 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  28 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  29
  30 void *dma_alloc_coherent(struct device *dev, size_t size,
  31                            dma_addr_t *dma_handle, gfp_t flag);
  32
  33 void dma_free_coherent(struct device *dev, size_t size,
  34                          void *vaddr, dma_addr_t dma_handle);
  35
  36 static inline dma_addr_t
  37 dma_map_single(struct device *dev, void *ptr, size_t size,
  38                enum dma_data_direction direction)
  39 {
  40         BUG_ON(direction == DMA_NONE);
  41         consistent_sync(ptr, size, direction);
  42         return virt_to_phys(ptr);
  43 }
  44
  45 static inline void
  46 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  47                  enum dma_data_direction direction)
  48 {
  49         BUG_ON(direction == DMA_NONE);
  50 }
  51
  52 static inline int
  53 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  54            enum dma_data_direction direction)
  55 {
  56         int i;
  57
  58         BUG_ON(direction == DMA_NONE);
  59
  60         for (i = 0; i < nents; i++, sg++ ) {
  61                 BUG_ON(!sg->page);
  62
  63                 sg->dma_address = page_to_phys(sg->page) + sg->offset;
  64                 consistent_sync(page_address(sg->page) + sg->offset,
  65                                 sg->length, direction);
  66         }
  67
  68         return nents;
  69 }
  70
  71 static inline dma_addr_t
  72 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  73              size_t size, enum dma_data_direction direction)
  74 {
  75         BUG_ON(direction == DMA_NONE);
  76         return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
  77 }
  78
  79 static inline void
  80 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 void
  88 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  89              enum dma_data_direction direction)
  90 {
  91         BUG_ON(direction == DMA_NONE);
  92 }
  93
  94 static inline void
  95 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  96                 enum dma_data_direction direction)
  97 {
  98         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
  99 }
 100
 101 static inline void
 102 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 103                 enum dma_data_direction direction)
 104 {
 105         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
 106 }
 107
 108 static inline void
 109 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 110                       unsigned long offset, size_t size,
 111                       enum dma_data_direction direction)
 112 {
 113
 114         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
 115 }
 116
 117 static inline void
 118 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
 123         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
 124 }
 125 static inline void
 126 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 127                  enum dma_data_direction dir)
 128 {
 129         int i;
 130         for (i = 0; i < nelems; i++, sg++)
 131                 consistent_sync(page_address(sg->page) + sg->offset,
 132                                 sg->length, dir);
 133 }
 134
 135 static inline void
 136 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 137                  enum dma_data_direction dir)
 138 {
 139         int i;
 140         for (i = 0; i < nelems; i++, sg++)
 141                 consistent_sync(page_address(sg->page) + sg->offset,
 142                                 sg->length, dir);
 143 }
 144 static inline int
 145 dma_mapping_error(dma_addr_t dma_addr)
 146 {
 147         return 0;
 148 }
 149
 150 static inline int
 151 dma_supported(struct device *dev, u64 mask)
 152 {
 153         return 1;
 154 }
 155
 156 static inline int
 157 dma_set_mask(struct device *dev, u64 mask)
 158 {
 159         if(!dev->dma_mask || !dma_supported(dev, mask))
 160                 return -EIO;
 161
 162         *dev->dma_mask = mask;
 163
 164         return 0;
 165 }
 166
 167 static inline int
 168 dma_get_cache_alignment(void)
 169 {
 170         return L1_CACHE_BYTES;
 171 }
 172
 173 #define dma_is_consistent(d, h) (1)
 174
 175 static inline void
 176 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 177                enum dma_data_direction direction)
 178 {
 179         consistent_sync(vaddr, size, direction);
 180 }
 181
 182 #endif  /* _XTENSA_DMA_MAPPING_H */