LXR linux/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
  14extern struct dma_map_ops s390_dma_ops;
  15
  16static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  17{
  18        return &s390_dma_ops;
  19}
  20
  21extern int dma_set_mask(struct device *dev, u64 mask);
  22
  23static 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
  33static 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
  42static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  43{
  44        if (!dev->dma_mask)
  45                return 0;
  46        return addr + size - 1 <= *dev->dma_mask;
  47}
  48
  49static 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
  61static 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
  78static 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 */
  91