arch/sh/include/asm/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 <linux/dma-debug.h>
   7 #include <asm/cacheflush.h>
   8 #include <asm/io.h>
   9 #include <asm-generic/dma-coherent.h>
  10
  11 extern struct bus_type pci_bus_type;
  12
  13 #define dma_supported(dev, mask)        (1)
  14
  15 static inline int dma_set_mask(struct device *dev, u64 mask)
  16 {
  17         if (!dev->dma_mask || !dma_supported(dev, mask))
  18                 return -EIO;
  19
  20         *dev->dma_mask = mask;
  21
  22         return 0;
  23 }
  24
  25 void *dma_alloc_coherent(struct device *dev, size_t size,
  26                          dma_addr_t *dma_handle, gfp_t flag);
  27
  28 void dma_free_coherent(struct device *dev, size_t size,
  29                        void *vaddr, dma_addr_t dma_handle);
  30
  31 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  32                     enum dma_data_direction dir);
  33
  34 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  35 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  36 #define dma_is_consistent(d, h) (1)
  37
  38 static inline dma_addr_t dma_map_single(struct device *dev,
  39                                         void *ptr, size_t size,
  40                                         enum dma_data_direction dir)
  41 {
  42         dma_addr_t addr = virt_to_phys(ptr);
  43
  44 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
  45         if (dev->bus == &pci_bus_type)
  46                 return addr;
  47 #endif
  48         dma_cache_sync(dev, ptr, size, dir);
  49
  50         debug_dma_map_page(dev, virt_to_page(ptr),
  51                            (unsigned long)ptr & ~PAGE_MASK, size,
  52                            dir, addr, true);
  53
  54         return addr;
  55 }
  56
  57 static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
  58                                     size_t size, enum dma_data_direction dir)
  59 {
  60         debug_dma_unmap_page(dev, addr, size, dir, true);
  61 }
  62
  63 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
  64                              int nents, enum dma_data_direction dir)
  65 {
  66         int i;
  67
  68         for (i = 0; i < nents; i++) {
  69 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
  70                 dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, dir);
  71 #endif
  72                 sg[i].dma_address = sg_phys(&sg[i]);
  73                 sg[i].dma_length = sg[i].length;
  74         }
  75
  76         debug_dma_map_sg(dev, sg, nents, i, dir);
  77
  78         return nents;
  79 }
  80
  81 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
  82                                 int nents, enum dma_data_direction dir)
  83 {
  84         debug_dma_unmap_sg(dev, sg, nents, dir);
  85 }
  86
  87 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
  88                                       unsigned long offset, size_t size,
  89                                       enum dma_data_direction dir)
  90 {
  91         return dma_map_single(dev, page_address(page) + offset, size, dir);
  92 }
  93
  94 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
  95                                   size_t size, enum dma_data_direction dir)
  96 {
  97         dma_unmap_single(dev, dma_address, size, dir);
  98 }
  99
 100 static inline void __dma_sync_single(struct device *dev, dma_addr_t dma_handle,
 101                                    size_t size, enum dma_data_direction dir)
 102 {
 103 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 104         if (dev->bus == &pci_bus_type)
 105                 return;
 106 #endif
 107         dma_cache_sync(dev, phys_to_virt(dma_handle), size, dir);
 108 }
 109
 110 static inline void dma_sync_single_range(struct device *dev,
 111                                          dma_addr_t dma_handle,
 112                                          unsigned long offset, size_t size,
 113                                          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, phys_to_virt(dma_handle) + offset, size, dir);
 120 }
 121
 122 static inline void __dma_sync_sg(struct device *dev, struct scatterlist *sg,
 123                                int nelems, enum dma_data_direction dir)
 124 {
 125         int i;
 126
 127         for (i = 0; i < nelems; i++) {
 128 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 129                 dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, dir);
 130 #endif
 131                 sg[i].dma_address = sg_phys(&sg[i]);
 132                 sg[i].dma_length = sg[i].length;
 133         }
 134 }
 135
 136 static inline void dma_sync_single_for_cpu(struct device *dev,
 137                                            dma_addr_t dma_handle, size_t size,
 138                                            enum dma_data_direction dir)
 139 {
 140         __dma_sync_single(dev, dma_handle, size, dir);
 141         debug_dma_sync_single_for_cpu(dev, dma_handle, size, dir);
 142 }
 143
 144 static inline void dma_sync_single_for_device(struct device *dev,
 145                                               dma_addr_t dma_handle,
 146                                               size_t size,
 147                                               enum dma_data_direction dir)
 148 {
 149         __dma_sync_single(dev, dma_handle, size, dir);
 150         debug_dma_sync_single_for_device(dev, dma_handle, size, dir);
 151 }
 152
 153 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 154                                                  dma_addr_t dma_handle,
 155                                                  unsigned long offset,
 156                                                  size_t size,
 157                                                  enum dma_data_direction direction)
 158 {
 159         dma_sync_single_for_cpu(dev, dma_handle+offset, size, direction);
 160         debug_dma_sync_single_range_for_cpu(dev, dma_handle,
 161                                             offset, size, direction);
 162 }
 163
 164 static inline void dma_sync_single_range_for_device(struct device *dev,
 165                                                     dma_addr_t dma_handle,
 166                                                     unsigned long offset,
 167                                                     size_t size,
 168                                                     enum dma_data_direction direction)
 169 {
 170         dma_sync_single_for_device(dev, dma_handle+offset, size, direction);
 171         debug_dma_sync_single_range_for_device(dev, dma_handle,
 172                                                offset, size, direction);
 173 }
 174
 175
 176 static inline void dma_sync_sg_for_cpu(struct device *dev,
 177                                        struct scatterlist *sg, int nelems,
 178                                        enum dma_data_direction dir)
 179 {
 180         __dma_sync_sg(dev, sg, nelems, dir);
 181         debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 182 }
 183
 184 static inline void dma_sync_sg_for_device(struct device *dev,
 185                                           struct scatterlist *sg, int nelems,
 186                                           enum dma_data_direction dir)
 187 {
 188         __dma_sync_sg(dev, sg, nelems, dir);
 189         debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 190 }
 191
 192 static inline int dma_get_cache_alignment(void)
 193 {
 194         /*
 195          * Each processor family will define its own L1_CACHE_SHIFT,
 196          * L1_CACHE_BYTES wraps to this, so this is always safe.
 197          */
 198         return L1_CACHE_BYTES;
 199 }
 200
 201 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 202 {
 203         return dma_addr == 0;
 204 }
 205
 206 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 207
 208 extern int
 209 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 210                             dma_addr_t device_addr, size_t size, int flags);
 211
 212 extern void
 213 dma_release_declared_memory(struct device *dev);
 214
 215 extern void *
 216 dma_mark_declared_memory_occupied(struct device *dev,
 217                                   dma_addr_t device_addr, size_t size);
 218
 219 #endif /* __ASM_SH_DMA_MAPPING_H */