arch/s390/include/asm/dma-mapping.h

   1 #ifndef _ASM_S390_DMA_MAPPING_H
   2 #define _ASM_S390_DMA_MAPPING_H
   3
   4 #include <linux/kernel.h>
   5 #include <linux/types.h>
   6 #include <linux/mm.h>
   7 #include <linux/scatterlist.h>
   8 #include <linux/dma-attrs.h>
   9 #include <linux/dma-debug.h>
  10 #include <linux/io.h>
  11
  12 #define DMA_ERROR_CODE          (~(dma_addr_t) 0x0)
  13
  14 extern struct dma_map_ops s390_dma_ops;
  15
  16 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  17 {
  18         return &s390_dma_ops;
  19 }
  20
  21 extern int dma_set_mask(struct device *dev, u64 mask);
  22
  23 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  24                                   enum dma_data_direction direction)
  25 {
  26 }
  27
  28 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  29 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  30
  31 #include <asm-generic/dma-mapping-common.h>
  32
  33 static inline int dma_supported(struct device *dev, u64 mask)
  34 {
  35         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  36
  37         if (dma_ops->dma_supported == NULL)
  38                 return 1;
  39         return dma_ops->dma_supported(dev, mask);
  40 }
  41
  42 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  43 {
  44         if (!dev->dma_mask)
  45                 return false;
  46         return addr + size - 1 <= *dev->dma_mask;
  47 }
  48
  49 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  50 {
  51         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  52
  53         debug_dma_mapping_error(dev, dma_addr);
  54         if (dma_ops->mapping_error)
  55                 return dma_ops->mapping_error(dev, dma_addr);
  56         return dma_addr == DMA_ERROR_CODE;
  57 }
  58
  59 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
  60
  61 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
  62                                     dma_addr_t *dma_handle, gfp_t flags,
  63                                     struct dma_attrs *attrs)
  64 {
  65         struct dma_map_ops *ops = get_dma_ops(dev);
  66         void *cpu_addr;
  67
  68         BUG_ON(!ops);
  69
  70         cpu_addr = ops->alloc(dev, size, dma_handle, flags, attrs);
  71         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
  72
  73         return cpu_addr;
  74 }
  75
  76 #define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL)
  77
  78 static inline void dma_free_attrs(struct device *dev, size_t size,
  79                                   void *cpu_addr, dma_addr_t dma_handle,
  80                                   struct dma_attrs *attrs)
  81 {
  82         struct dma_map_ops *ops = get_dma_ops(dev);
  83
  84         BUG_ON(!ops);
  85
  86         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
  87         ops->free(dev, size, cpu_addr, dma_handle, attrs);
  88 }
  89
  90 #endif /* _ASM_S390_DMA_MAPPING_H */