1 /*
2 * Copyright 2004-2009 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later.
5 */
6
7 #ifndef _BLACKFIN_DMA_MAPPING_H
8 #define _BLACKFIN_DMA_MAPPING_H
9
10 #include <asm/cacheflush.h>
11 struct scatterlist;
12
13 void *dma_alloc_coherent(struct device *dev, size_t size,
14 dma_addr_t *dma_handle, gfp_t gfp);
15 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
16 dma_addr_t dma_handle);
17
18 /*
19 * Now for the API extensions over the pci_ one
20 */
21 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
22 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
23 #define dma_supported(d, m) (1)
24
25 static inline int
dma_set_mask(struct device * dev,u64 dma_mask)26 dma_set_mask(struct device *dev, u64 dma_mask)
27 {
28 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
29 return -EIO;
30
31 *dev->dma_mask = dma_mask;
32
33 return 0;
34 }
35
36 static inline int
dma_mapping_error(struct device * dev,dma_addr_t dma_addr)37 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
38 {
39 return 0;
40 }
41
42 extern void
43 __dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
44 static inline void
__dma_sync_inline(dma_addr_t addr,size_t size,enum dma_data_direction dir)45 __dma_sync_inline(dma_addr_t addr, size_t size, enum dma_data_direction dir)
46 {
47 switch (dir) {
48 case DMA_NONE:
49 BUG();
50 case DMA_TO_DEVICE: /* writeback only */
51 flush_dcache_range(addr, addr + size);
52 break;
53 case DMA_FROM_DEVICE: /* invalidate only */
54 case DMA_BIDIRECTIONAL: /* flush and invalidate */
55 /* Blackfin has no dedicated invalidate (it includes a flush) */
56 invalidate_dcache_range(addr, addr + size);
57 break;
58 }
59 }
60 static inline void
_dma_sync(dma_addr_t addr,size_t size,enum dma_data_direction dir)61 _dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
62 {
63 if (__builtin_constant_p(dir))
64 __dma_sync_inline(addr, size, dir);
65 else
66 __dma_sync(addr, size, dir);
67 }
68
69 static inline dma_addr_t
dma_map_single(struct device * dev,void * ptr,size_t size,enum dma_data_direction dir)70 dma_map_single(struct device *dev, void *ptr, size_t size,
71 enum dma_data_direction dir)
72 {
73 _dma_sync((dma_addr_t)ptr, size, dir);
74 return (dma_addr_t) ptr;
75 }
76
77 static inline dma_addr_t
dma_map_page(struct device * dev,struct page * page,unsigned long offset,size_t size,enum dma_data_direction dir)78 dma_map_page(struct device *dev, struct page *page,
79 unsigned long offset, size_t size,
80 enum dma_data_direction dir)
81 {
82 return dma_map_single(dev, page_address(page) + offset, size, dir);
83 }
84
85 static inline void
dma_unmap_single(struct device * dev,dma_addr_t dma_addr,size_t size,enum dma_data_direction dir)86 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
87 enum dma_data_direction dir)
88 {
89 BUG_ON(!valid_dma_direction(dir));
90 }
91
92 static inline void
dma_unmap_page(struct device * dev,dma_addr_t dma_addr,size_t size,enum dma_data_direction dir)93 dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
94 enum dma_data_direction dir)
95 {
96 dma_unmap_single(dev, dma_addr, size, dir);
97 }
98
99 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
100 enum dma_data_direction dir);
101
102 static inline void
dma_unmap_sg(struct device * dev,struct scatterlist * sg,int nhwentries,enum dma_data_direction dir)103 dma_unmap_sg(struct device *dev, struct scatterlist *sg,
104 int nhwentries, enum dma_data_direction dir)
105 {
106 BUG_ON(!valid_dma_direction(dir));
107 }
108
109 static inline void
dma_sync_single_range_for_cpu(struct device * dev,dma_addr_t handle,unsigned long offset,size_t size,enum dma_data_direction dir)110 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
111 unsigned long offset, size_t size,
112 enum dma_data_direction dir)
113 {
114 BUG_ON(!valid_dma_direction(dir));
115 }
116
117 static inline void
dma_sync_single_range_for_device(struct device * dev,dma_addr_t handle,unsigned long offset,size_t size,enum dma_data_direction dir)118 dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
119 unsigned long offset, size_t size,
120 enum dma_data_direction dir)
121 {
122 _dma_sync(handle + offset, size, dir);
123 }
124
125 static inline void
dma_sync_single_for_cpu(struct device * dev,dma_addr_t handle,size_t size,enum dma_data_direction dir)126 dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
127 enum dma_data_direction dir)
128 {
129 dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
130 }
131
132 static inline void
dma_sync_single_for_device(struct device * dev,dma_addr_t handle,size_t size,enum dma_data_direction dir)133 dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
134 enum dma_data_direction dir)
135 {
136 dma_sync_single_range_for_device(dev, handle, 0, size, dir);
137 }
138
139 static inline void
dma_sync_sg_for_cpu(struct device * dev,struct scatterlist * sg,int nents,enum dma_data_direction dir)140 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
141 enum dma_data_direction dir)
142 {
143 BUG_ON(!valid_dma_direction(dir));
144 }
145
146 extern void
147 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
148 int nents, enum dma_data_direction dir);
149
150 static inline void
dma_cache_sync(struct device * dev,void * vaddr,size_t size,enum dma_data_direction dir)151 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
152 enum dma_data_direction dir)
153 {
154 _dma_sync((dma_addr_t)vaddr, size, dir);
155 }
156
157 /* drivers/base/dma-mapping.c */
158 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
159 void *cpu_addr, dma_addr_t dma_addr, size_t size);
160 extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
161 void *cpu_addr, dma_addr_t dma_addr,
162 size_t size);
163
164 #define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
165 #define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
166
167 #endif /* _BLACKFIN_DMA_MAPPING_H */
168