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
  26 extern struct dma_map_ops swiotlb_dma_map_ops;
  27
  28 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  29 {
  30         return &swiotlb_dma_map_ops;
  31 }
  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 (unlikely(dma_ops == NULL))
  38                 return 0;
  39
  40         return dma_ops->dma_supported(dev, mask);
  41 }
  42
  43 static 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
  55 static 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
  63 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  64 {
  65         return paddr;
  66 }
  67
  68 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  69 {
  70         return daddr;
  71 }
  72
  73 static inline void dma_mark_clean(void *addr, size_t size) {}
  74
  75 static 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 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
  86                                        dma_addr_t *dma_handle, gfp_t flag)
  87 {
  88         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  89
  90         return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
  91 }
  92
  93 static inline void dma_free_coherent(struct device *dev, size_t size,
  94                                      void *cpu_addr, dma_addr_t dma_handle)
  95 {
  96         struct dma_map_ops *dma_ops = get_dma_ops(dev);
  97
  98         dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
  99 }
 100
 101 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 102 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 103
 104 static inline void dma_cache_sync(struct device *dev, void *vaddr,
 105                 size_t size, enum dma_data_direction direction)
 106 {
 107         unsigned long start = (unsigned long)vaddr;
 108         unsigned long end   = start + size;
 109
 110         switch (direction) {
 111         case DMA_NONE:
 112                 BUG();
 113         case DMA_FROM_DEVICE:
 114         case DMA_BIDIRECTIONAL: /* writeback and invalidate */
 115                 __cpuc_dma_flush_range(start, end);
 116                 break;
 117         case DMA_TO_DEVICE:             /* writeback only */
 118                 __cpuc_dma_clean_range(start, end);
 119                 break;
 120         }
 121 }
 122
 123 #endif /* __KERNEL__ */
 124 #endif