summaryrefslogtreecommitdiffstats
path: root/arch/blackfin/include/asm/dma-mapping.h
blob: 413a30314a6f6db4bfad27153077c304ec6d11e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef _BLACKFIN_DMA_MAPPING_H
#define _BLACKFIN_DMA_MAPPING_H

#include <asm/cacheflush.h>
struct scatterlist;

void *dma_alloc_coherent(struct device *dev, size_t size,
			 dma_addr_t *dma_handle, gfp_t gfp);
void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
		       dma_addr_t dma_handle);

/*
 * Now for the API extensions over the pci_ one
 */
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
#define dma_supported(d, m)         (1)
#define dma_get_cache_alignment()   (32)
#define dma_is_consistent(d, h)     (1)

static inline int
dma_set_mask(struct device *dev, u64 dma_mask)
{
	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
		return -EIO;

	*dev->dma_mask = dma_mask;

	return 0;
}

static inline int
dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
	return 0;
}

extern void
__dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
static inline void
_dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
{
	if (!__builtin_constant_p(dir)) {
		__dma_sync(addr, size, dir);
		return;
	}

	switch (dir) {
	case DMA_NONE:
		BUG();
	case DMA_TO_DEVICE:		/* writeback only */
		flush_dcache_range(addr, addr + size);
		break;
	case DMA_FROM_DEVICE: /* invalidate only */
	case DMA_BIDIRECTIONAL: /* flush and invalidate */
		/* Blackfin has no dedicated invalidate (it includes a flush) */
		invalidate_dcache_range(addr, addr + size);
		break;
	}
}

static inline dma_addr_t
dma_map_single(struct device *dev, void *ptr, size_t size,
	       enum dma_data_direction dir)
{
	_dma_sync((dma_addr_t)ptr, size, dir);
	return (dma_addr_t) ptr;
}

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)
{
	return dma_map_single(dev, page_address(page) + offset, size, dir);
}

static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
		 enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
}

static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
	       enum dma_data_direction dir)
{
	dma_unmap_single(dev, dma_addr, size, dir);
}

extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
		      enum dma_data_direction dir);

static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg,
	     int nhwentries, enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
}

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)
{
	BUG_ON(!valid_dma_direction(dir));
}

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)
{
	_dma_sync(handle + offset, size, dir);
}

static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
			enum dma_data_direction dir)
{
	dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
}

static inline void
dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
			   enum dma_data_direction dir)
{
	dma_sync_single_range_for_device(dev, handle, 0, size, dir);
}

static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
		    enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
}

extern void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
		       int nents, enum dma_data_direction dir);

static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
	       enum dma_data_direction dir)
{
	_dma_sync((dma_addr_t)vaddr, size, dir);
}

#endif				/* _BLACKFIN_DMA_MAPPING_H */