include/asm-sh64/dma-mapping.h

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