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