LXR linux/arch/unicore32/include/asm/dma-mapping.h

   1/*
   2 * linux/arch/unicore32/include/asm/dma-mapping.h
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12#ifndef __UNICORE_DMA_MAPPING_H__
  13#define __UNICORE_DMA_MAPPING_H__
  14
  15#ifdef __KERNEL__
  16
  17#include <linux/mm_types.h>
  18#include <linux/scatterlist.h>
  19#include <linux/swiotlb.h>
  20
  21#include <asm-generic/dma-coherent.h>
  22
  23#include <asm/memory.h>
  24#include <asm/cacheflush.h>
  25
  26extern struct dma_map_ops swiotlb_dma_map_ops;
  27
  28static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  29{
  30        return &swiotlb_dma_map_ops;
  31}
  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 (unlikely(dma_ops == NULL))
  38                return 0;
  39
  40        return dma_ops->dma_supported(dev, mask);
  41}
  42
  43static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  44{
  45        struct dma_map_ops *dma_ops = get_dma_ops(dev);
  46
  47        if (dma_ops->mapping_error)
  48                return dma_ops->mapping_error(dev, dma_addr);
  49
  50        return 0;
  51}
  52
  53#include <asm-generic/dma-mapping-common.h>
  54
  55static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  56{
  57        if (dev && dev->dma_mask)
  58                return addr + size - 1 <= *dev->dma_mask;
  59
  60        return 1;
  61}
  62
  63static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  64{
  65        return paddr;
  66}
  67
  68static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  69{
  70        return daddr;
  71}
  72
  73static inline void dma_mark_clean(void *addr, size_t size) {}
  74
  75static inline int dma_set_mask(struct device *dev, u64 dma_mask)
  76{
  77        if (!dev->dma_mask || !dma_supported(dev, dma_mask))
  78                return -EIO;
  79
  80        *dev->dma_mask = dma_mask;
  81
  82        return 0;
  83}
  84
  85#define dma_alloc_coherent(d,s,h,f)     dma_alloc_attrs(d,s,h,f,NULL)
  86
  87static inline void *dma_alloc_attrs(struct device *dev, size_t size,
  88                                    dma_addr_t *dma_handle, gfp_t flag,
  89                                    struct dma_attrs *attrs)
  90{
  91        struct dma_map_ops *dma_ops = get_dma_ops(dev);
  92
  93        return dma_ops->alloc(dev, size, dma_handle, flag, attrs);
  94}
  95
  96#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
  97
  98static inline void dma_free_attrs(struct device *dev, size_t size,
  99                                  void *cpu_addr, dma_addr_t dma_handle,
 100                                  struct dma_attrs *attrs)
 101{
 102        struct dma_map_ops *dma_ops = get_dma_ops(dev);
 103
 104        dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
 105}
 106
 107#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 108#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 109
 110static inline void dma_cache_sync(struct device *dev, void *vaddr,
 111                size_t size, enum dma_data_direction direction)
 112{
 113        unsigned long start = (unsigned long)vaddr;
 114        unsigned long end   = start + size;
 115
 116        switch (direction) {
 117        case DMA_NONE:
 118                BUG();
 119        case DMA_FROM_DEVICE:
 120        case DMA_BIDIRECTIONAL: /* writeback and invalidate */
 121                __cpuc_dma_flush_range(start, end);
 122                break;
 123        case DMA_TO_DEVICE:             /* writeback only */
 124                __cpuc_dma_clean_range(start, end);
 125                break;
 126        }
 127}
 128
 129#endif /* __KERNEL__ */
 130#endif
 131