include/asm-sh/dma-mapping.h

   1 #ifndef __ASM_SH_DMA_MAPPING_H
   2 #define __ASM_SH_DMA_MAPPING_H
   3
   4 #include <linux/mm.h>
   5 #include <asm/scatterlist.h>
   6 #include <asm/cacheflush.h>
   7 #include <asm/io.h>
   8
   9 extern struct bus_type pci_bus_type;
  10
  11 /* arch/sh/mm/consistent.c */
  12 extern void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle);
  13 extern void consistent_free(void *vaddr, size_t size);
  14 extern void consistent_sync(void *vaddr, size_t size, int direction);
  15
  16 #define dma_supported(dev, mask)        (1)
  17
  18 static inline int dma_set_mask(struct device *dev, u64 mask)
  19 {
  20         if (!dev->dma_mask || !dma_supported(dev, mask))
  21                 return -EIO;
  22
  23         *dev->dma_mask = mask;
  24
  25         return 0;
  26 }
  27
  28 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
  29                          dma_addr_t *dma_handle, gfp_t flag)
  30 {
  31         if (sh_mv.mv_consistent_alloc) {
  32                 void *ret;
  33
  34                 ret = sh_mv.mv_consistent_alloc(dev, size, dma_handle, flag);
  35                 if (ret != NULL)
  36                         return ret;
  37         }
  38
  39         return consistent_alloc(flag, size, dma_handle);
  40 }
  41
  42 static inline void dma_free_coherent(struct device *dev, size_t size,
  43                        void *vaddr, dma_addr_t dma_handle)
  44 {
  45         if (sh_mv.mv_consistent_free) {
  46                 int ret;
  47
  48                 ret = sh_mv.mv_consistent_free(dev, size, vaddr, dma_handle);
  49                 if (ret == 0)
  50                         return;
  51         }
  52
  53         consistent_free(vaddr, size);
  54 }
  55
  56 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  57 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  58 #define dma_is_consistent(d, h) (1)
  59
  60 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  61                                   enum dma_data_direction dir)
  62 {
  63         consistent_sync(vaddr, size, (int)dir);
  64 }
  65
  66 static inline dma_addr_t dma_map_single(struct device *dev,
  67                                         void *ptr, size_t size,
  68                                         enum dma_data_direction dir)
  69 {
  70 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
  71         if (dev->bus == &pci_bus_type)
  72                 return virt_to_bus(ptr);
  73 #endif
  74         dma_cache_sync(dev, ptr, size, dir);
  75
  76         return virt_to_bus(ptr);
  77 }
  78
  79 #define dma_unmap_single(dev, addr, size, dir)  do { } while (0)
  80
  81 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
  82                              int nents, enum dma_data_direction dir)
  83 {
  84         int i;
  85
  86         for (i = 0; i < nents; i++) {
  87 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
  88                 dma_cache_sync(dev, page_address(sg[i].page) + sg[i].offset,
  89                                sg[i].length, dir);
  90 #endif
  91                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
  92         }
  93
  94         return nents;
  95 }
  96
  97 #define dma_unmap_sg(dev, sg, nents, dir)       do { } while (0)
  98
  99 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 100                                       unsigned long offset, size_t size,
 101                                       enum dma_data_direction dir)
 102 {
 103         return dma_map_single(dev, page_address(page) + offset, size, dir);
 104 }
 105
 106 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 107                                   size_t size, enum dma_data_direction dir)
 108 {
 109         dma_unmap_single(dev, dma_address, size, dir);
 110 }
 111
 112 static inline void dma_sync_single(struct device *dev, dma_addr_t dma_handle,
 113                                    size_t size, enum dma_data_direction dir)
 114 {
 115 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 116         if (dev->bus == &pci_bus_type)
 117                 return;
 118 #endif
 119         dma_cache_sync(dev, bus_to_virt(dma_handle), size, dir);
 120 }
 121
 122 static inline void dma_sync_single_range(struct device *dev,
 123                                          dma_addr_t dma_handle,
 124                                          unsigned long offset, size_t size,
 125                                          enum dma_data_direction dir)
 126 {
 127 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 128         if (dev->bus == &pci_bus_type)
 129                 return;
 130 #endif
 131         dma_cache_sync(dev, bus_to_virt(dma_handle) + offset, size, dir);
 132 }
 133
 134 static inline void dma_sync_sg(struct device *dev, struct scatterlist *sg,
 135                                int nelems, enum dma_data_direction dir)
 136 {
 137         int i;
 138
 139         for (i = 0; i < nelems; i++) {
 140 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 141                 dma_cache_sync(dev, page_address(sg[i].page) + sg[i].offset,
 142                                sg[i].length, dir);
 143 #endif
 144                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
 145         }
 146 }
 147
 148 static inline void dma_sync_single_for_cpu(struct device *dev,
 149                                            dma_addr_t dma_handle, size_t size,
 150                                            enum dma_data_direction dir)
 151 {
 152         dma_sync_single(dev, dma_handle, size, dir);
 153 }
 154
 155 static inline void dma_sync_single_for_device(struct device *dev,
 156                                               dma_addr_t dma_handle,
 157                                               size_t size,
 158                                               enum dma_data_direction dir)
 159 {
 160         dma_sync_single(dev, dma_handle, size, dir);
 161 }
 162
 163 static inline void dma_sync_sg_for_cpu(struct device *dev,
 164                                        struct scatterlist *sg, int nelems,
 165                                        enum dma_data_direction dir)
 166 {
 167         dma_sync_sg(dev, sg, nelems, dir);
 168 }
 169
 170 static inline void dma_sync_sg_for_device(struct device *dev,
 171                                           struct scatterlist *sg, int nelems,
 172                                           enum dma_data_direction dir)
 173 {
 174         dma_sync_sg(dev, sg, nelems, dir);
 175 }
 176
 177
 178 static inline int dma_get_cache_alignment(void)
 179 {
 180         /*
 181          * Each processor family will define its own L1_CACHE_SHIFT,
 182          * L1_CACHE_BYTES wraps to this, so this is always safe.
 183          */
 184         return L1_CACHE_BYTES;
 185 }
 186
 187 static inline int dma_mapping_error(dma_addr_t dma_addr)
 188 {
 189         return dma_addr == 0;
 190 }
 191 #endif /* __ASM_SH_DMA_MAPPING_H */