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dma-mapping.h
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1 #ifndef _ASM_IA64_DMA_MAPPING_H
2 #define _ASM_IA64_DMA_MAPPING_H
3 
4 /*
5  * Copyright (C) 2003-2004 Hewlett-Packard Co
6  * David Mosberger-Tang <[email protected]>
7  */
8 #include <asm/machvec.h>
9 #include <linux/scatterlist.h>
10 #include <asm/swiotlb.h>
11 #include <linux/dma-debug.h>
12 
13 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
14 
15 #define DMA_ERROR_CODE 0
16 
17 extern struct dma_map_ops *dma_ops;
18 extern struct ia64_machine_vector ia64_mv;
19 extern void set_iommu_machvec(void);
20 
21 extern void machvec_dma_sync_single(struct device *, dma_addr_t, size_t,
22  enum dma_data_direction);
23 extern void machvec_dma_sync_sg(struct device *, struct scatterlist *, int,
24  enum dma_data_direction);
25 
26 #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
27 
28 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
29  dma_addr_t *daddr, gfp_t gfp,
30  struct dma_attrs *attrs)
31 {
32  struct dma_map_ops *ops = platform_dma_get_ops(dev);
33  void *caddr;
34 
35  caddr = ops->alloc(dev, size, daddr, gfp, attrs);
36  debug_dma_alloc_coherent(dev, size, *daddr, caddr);
37  return caddr;
38 }
39 
40 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
41 
42 static inline void dma_free_attrs(struct device *dev, size_t size,
43  void *caddr, dma_addr_t daddr,
44  struct dma_attrs *attrs)
45 {
46  struct dma_map_ops *ops = platform_dma_get_ops(dev);
47  debug_dma_free_coherent(dev, size, caddr, daddr);
48  ops->free(dev, size, caddr, daddr, attrs);
49 }
50 
51 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
52 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
53 
54 #define get_dma_ops(dev) platform_dma_get_ops(dev)
55 
57 
58 static inline int dma_mapping_error(struct device *dev, dma_addr_t daddr)
59 {
60  struct dma_map_ops *ops = platform_dma_get_ops(dev);
61  return ops->mapping_error(dev, daddr);
62 }
63 
64 static inline int dma_supported(struct device *dev, u64 mask)
65 {
66  struct dma_map_ops *ops = platform_dma_get_ops(dev);
67  return ops->dma_supported(dev, mask);
68 }
69 
70 static inline int
71 dma_set_mask (struct device *dev, u64 mask)
72 {
73  if (!dev->dma_mask || !dma_supported(dev, mask))
74  return -EIO;
75  *dev->dma_mask = mask;
76  return 0;
77 }
78 
79 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
80 {
81  if (!dev->dma_mask)
82  return 0;
83 
84  return addr + size - 1 <= *dev->dma_mask;
85 }
86 
87 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
88 {
89  return paddr;
90 }
91 
92 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
93 {
94  return daddr;
95 }
96 
97 static inline void
98 dma_cache_sync (struct device *dev, void *vaddr, size_t size,
99  enum dma_data_direction dir)
100 {
101  /*
102  * IA-64 is cache-coherent, so this is mostly a no-op. However, we do need to
103  * ensure that dma_cache_sync() enforces order, hence the mb().
104  */
105  mb();
106 }
107 
108 #endif /* _ASM_IA64_DMA_MAPPING_H */