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dma-mapping.h
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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 
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 
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 #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
86 
87 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
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 
98 static 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 
110 static 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