include/asm-xtensa/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 /*
  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(sg));
  62
  63                 sg->dma_address = sg_phys(sg);
  64                 consistent_sync(sg_virt(sg), sg->length, direction);
  65         }
  66
  67         return nents;
  68 }
  69
  70 static inline dma_addr_t
  71 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  72              size_t size, enum dma_data_direction direction)
  73 {
  74         BUG_ON(direction == DMA_NONE);
  75         return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
  76 }
  77
  78 static inline void
  79 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  80                enum dma_data_direction direction)
  81 {
  82         BUG_ON(direction == DMA_NONE);
  83 }
  84
  85
  86 static inline void
  87 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  88              enum dma_data_direction direction)
  89 {
  90         BUG_ON(direction == DMA_NONE);
  91 }
  92
  93 static inline void
  94 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  95                 enum dma_data_direction direction)
  96 {
  97         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
  98 }
  99
 100 static inline void
 101 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 102                 enum dma_data_direction direction)
 103 {
 104         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
 105 }
 106
 107 static inline void
 108 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 109                       unsigned long offset, size_t size,
 110                       enum dma_data_direction direction)
 111 {
 112
 113         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
 114 }
 115
 116 static inline void
 117 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 118                       unsigned long offset, size_t size,
 119                       enum dma_data_direction direction)
 120 {
 121
 122         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
 123 }
 124 static inline void
 125 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 126                  enum dma_data_direction dir)
 127 {
 128         int i;
 129         for (i = 0; i < nelems; i++, sg++)
 130                 consistent_sync(sg_virt(sg), sg->length, dir);
 131 }
 132
 133 static inline void
 134 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 135                  enum dma_data_direction dir)
 136 {
 137         int i;
 138         for (i = 0; i < nelems; i++, sg++)
 139                 consistent_sync(sg_virt(sg), sg->length, dir);
 140 }
 141 static inline int
 142 dma_mapping_error(dma_addr_t dma_addr)
 143 {
 144         return 0;
 145 }
 146
 147 static inline int
 148 dma_supported(struct device *dev, u64 mask)
 149 {
 150         return 1;
 151 }
 152
 153 static inline int
 154 dma_set_mask(struct device *dev, u64 mask)
 155 {
 156         if(!dev->dma_mask || !dma_supported(dev, mask))
 157                 return -EIO;
 158
 159         *dev->dma_mask = mask;
 160
 161         return 0;
 162 }
 163
 164 static inline int
 165 dma_get_cache_alignment(void)
 166 {
 167         return L1_CACHE_BYTES;
 168 }
 169
 170 #define dma_is_consistent(d, h) (1)
 171
 172 static inline void
 173 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 174                enum dma_data_direction direction)
 175 {
 176         consistent_sync(vaddr, size, direction);
 177 }
 178
 179 #endif  /* _XTENSA_DMA_MAPPING_H */