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 static inline void dma_cache_sync(void *vaddr, size_t size,
  57                                   enum dma_data_direction dir)
  58 {
  59         consistent_sync(vaddr, size, (int)dir);
  60 }
  61
  62 static inline dma_addr_t dma_map_single(struct device *dev,
  63                                         void *ptr, size_t size,
  64                                         enum dma_data_direction dir)
  65 {
  66 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
  67         if (dev->bus == &pci_bus_type)
  68                 return virt_to_bus(ptr);
  69 #endif
  70         dma_cache_sync(ptr, size, dir);
  71
  72         return virt_to_bus(ptr);
  73 }
  74
  75 #define dma_unmap_single(dev, addr, size, dir)  do { } while (0)
  76
  77 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
  78                              int nents, enum dma_data_direction dir)
  79 {
  80         int i;
  81
  82         for (i = 0; i < nents; i++) {
  83 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
  84                 dma_cache_sync(page_address(sg[i].page) + sg[i].offset,
  85                                sg[i].length, dir);
  86 #endif
  87                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
  88         }
  89
  90         return nents;
  91 }
  92
  93 #define dma_unmap_sg(dev, sg, nents, dir)       do { } while (0)
  94
  95 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
  96                                       unsigned long offset, size_t size,
  97                                       enum dma_data_direction dir)
  98 {
  99         return dma_map_single(dev, page_address(page) + offset, size, dir);
 100 }
 101
 102 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 103                                   size_t size, enum dma_data_direction dir)
 104 {
 105         dma_unmap_single(dev, dma_address, size, dir);
 106 }
 107
 108 static inline void dma_sync_single(struct device *dev, dma_addr_t dma_handle,
 109                                    size_t size, enum dma_data_direction dir)
 110 {
 111 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 112         if (dev->bus == &pci_bus_type)
 113                 return;
 114 #endif
 115         dma_cache_sync(bus_to_virt(dma_handle), size, dir);
 116 }
 117
 118 static inline void dma_sync_single_range(struct device *dev,
 119                                          dma_addr_t dma_handle,
 120                                          unsigned long offset, size_t size,
 121                                          enum dma_data_direction dir)
 122 {
 123 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 124         if (dev->bus == &pci_bus_type)
 125                 return;
 126 #endif
 127         dma_cache_sync(bus_to_virt(dma_handle) + offset, size, dir);
 128 }
 129
 130 static inline void dma_sync_sg(struct device *dev, struct scatterlist *sg,
 131                                int nelems, enum dma_data_direction dir)
 132 {
 133         int i;
 134
 135         for (i = 0; i < nelems; i++) {
 136 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 137                 dma_cache_sync(page_address(sg[i].page) + sg[i].offset,
 138                                sg[i].length, dir);
 139 #endif
 140                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
 141         }
 142 }
 143
 144 static void dma_sync_single_for_cpu(struct device *dev,
 145                                     dma_addr_t dma_handle, size_t size,
 146                                     enum dma_data_direction dir)
 147         __attribute__ ((alias("dma_sync_single")));
 148
 149 static void dma_sync_single_for_device(struct device *dev,
 150                                        dma_addr_t dma_handle, size_t size,
 151                                        enum dma_data_direction dir)
 152         __attribute__ ((alias("dma_sync_single")));
 153
 154 static void dma_sync_sg_for_cpu(struct device *dev,
 155                                 struct scatterlist *sg, int nelems,
 156                                 enum dma_data_direction dir)
 157         __attribute__ ((alias("dma_sync_sg")));
 158
 159 static void dma_sync_sg_for_device(struct device *dev,
 160                                    struct scatterlist *sg, int nelems,
 161                                    enum dma_data_direction dir)
 162         __attribute__ ((alias("dma_sync_sg")));
 163
 164 static inline int dma_get_cache_alignment(void)
 165 {
 166         /*
 167          * Each processor family will define its own L1_CACHE_SHIFT,
 168          * L1_CACHE_BYTES wraps to this, so this is always safe.
 169          */
 170         return L1_CACHE_BYTES;
 171 }
 172
 173 static inline int dma_mapping_error(dma_addr_t dma_addr)
 174 {
 175         return dma_addr == 0;
 176 }
 177
 178 #endif /* __ASM_SH_DMA_MAPPING_H */
 179