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 *sg, int nents,
  56            enum dma_data_direction direction)
  57 {
  58         int i;
  59
  60         BUG_ON(direction == DMA_NONE);
  61
  62         for (i = 0; i < nents; i++, sg++ ) {
  63                 BUG_ON(!sg_page(sg));
  64
  65                 sg->dma_address = sg_phys(sg);
  66                 consistent_sync(sg_virt(sg), sg->length, direction);
  67         }
  68
  69         return nents;
  70 }
  71
  72 static inline dma_addr_t
  73 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  74              size_t size, enum dma_data_direction direction)
  75 {
  76         BUG_ON(direction == DMA_NONE);
  77         return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
  78 }
  79
  80 static inline void
  81 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  82                enum dma_data_direction direction)
  83 {
  84         BUG_ON(direction == DMA_NONE);
  85 }
  86
  87
  88 static inline void
  89 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  90              enum dma_data_direction direction)
  91 {
  92         BUG_ON(direction == DMA_NONE);
  93 }
  94
  95 static inline void
  96 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  97                 enum dma_data_direction direction)
  98 {
  99         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
 100 }
 101
 102 static inline void
 103 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 104                            size_t size, enum dma_data_direction direction)
 105 {
 106         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
 107 }
 108
 109 static inline void
 110 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 111                       unsigned long offset, size_t size,
 112                       enum dma_data_direction direction)
 113 {
 114
 115         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
 116 }
 117
 118 static inline void
 119 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 120                       unsigned long offset, size_t size,
 121                       enum dma_data_direction direction)
 122 {
 123
 124         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
 125 }
 126 static inline void
 127 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 128                  enum dma_data_direction dir)
 129 {
 130         int i;
 131         for (i = 0; i < nelems; i++, sg++)
 132                 consistent_sync(sg_virt(sg), 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(sg_virt(sg), sg->length, dir);
 142 }
 143 static inline int
 144 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 145 {
 146         return 0;
 147 }
 148
 149 static inline int
 150 dma_supported(struct device *dev, u64 mask)
 151 {
 152         return 1;
 153 }
 154
 155 static inline int
 156 dma_set_mask(struct device *dev, u64 mask)
 157 {
 158         if(!dev->dma_mask || !dma_supported(dev, mask))
 159                 return -EIO;
 160
 161         *dev->dma_mask = mask;
 162
 163         return 0;
 164 }
 165
 166 static inline void
 167 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 168                enum dma_data_direction direction)
 169 {
 170         consistent_sync(vaddr, size, direction);
 171 }
 172
 173 /* Not supported for now */
 174 static inline int dma_mmap_coherent(struct device *dev,
 175                                     struct vm_area_struct *vma, void *cpu_addr,
 176                                     dma_addr_t dma_addr, size_t size)
 177 {
 178         return -EINVAL;
 179 }
 180
 181 static inline int dma_get_sgtable(struct device *dev, struct sg_table *sgt,
 182                                   void *cpu_addr, dma_addr_t dma_addr,
 183                                   size_t size)
 184 {
 185         return -EINVAL;
 186 }
 187
 188 #endif  /* _XTENSA_DMA_MAPPING_H */