summaryrefslogtreecommitdiffstats
path: root/arch/openrisc/include/asm/dma-mapping.h
blob: b206ba4608b232ffc398b70e92ddd96a4c98f325 (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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
/*
 * OpenRISC Linux
 *
 * Linux architectural port borrowing liberally from similar works of
 * others.  All original copyrights apply as per the original source
 * declaration.
 *
 * OpenRISC implementation:
 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef __ASM_OPENRISC_DMA_MAPPING_H
#define __ASM_OPENRISC_DMA_MAPPING_H

/*
 * See Documentation/DMA-API-HOWTO.txt and
 * Documentation/DMA-API.txt for documentation.
 *
 * This file is written with the intention of eventually moving over
 * to largely using asm-generic/dma-mapping-common.h in its place.
 */

#include <linux/dma-debug.h>
#include <asm-generic/dma-coherent.h>
#include <linux/kmemcheck.h>

#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)


#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)

void *or1k_dma_alloc_coherent(struct device *dev, size_t size,
			      dma_addr_t *dma_handle, gfp_t flag);
void or1k_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
			    dma_addr_t dma_handle);
dma_addr_t or1k_map_page(struct device *dev, struct page *page,
			 unsigned long offset, size_t size,
			 enum dma_data_direction dir,
			 struct dma_attrs *attrs);
void or1k_unmap_page(struct device *dev, dma_addr_t dma_handle,
		     size_t size, enum dma_data_direction dir,
		     struct dma_attrs *attrs);
int or1k_map_sg(struct device *dev, struct scatterlist *sg,
		int nents, enum dma_data_direction dir,
		struct dma_attrs *attrs);
void or1k_unmap_sg(struct device *dev, struct scatterlist *sg,
		   int nents, enum dma_data_direction dir,
		   struct dma_attrs *attrs);
void or1k_sync_single_for_cpu(struct device *dev,
			      dma_addr_t dma_handle, size_t size,
			      enum dma_data_direction dir);
void or1k_sync_single_for_device(struct device *dev,
			         dma_addr_t dma_handle, size_t size,
			         enum dma_data_direction dir);

static inline void *dma_alloc_coherent(struct device *dev, size_t size,
					dma_addr_t *dma_handle, gfp_t flag)
{
	void *memory;

	memory = or1k_dma_alloc_coherent(dev, size, dma_handle, flag);

	debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
	return memory;
}

static inline void dma_free_coherent(struct device *dev, size_t size,
				     void *cpu_addr, dma_addr_t dma_handle)
{
	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
	or1k_dma_free_coherent(dev, size, cpu_addr, dma_handle);
}

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

	kmemcheck_mark_initialized(ptr, size);
	BUG_ON(!valid_dma_direction(dir));
	addr = or1k_map_page(dev, virt_to_page(ptr),
			     (unsigned long)ptr & ~PAGE_MASK, size,
			     dir, NULL);
	debug_dma_map_page(dev, virt_to_page(ptr),
			   (unsigned long)ptr & ~PAGE_MASK, size,
			   dir, addr, true);
	return addr;
}

static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
					  size_t size,
					  enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
	or1k_unmap_page(dev, addr, size, dir, NULL);
	debug_dma_unmap_page(dev, addr, size, dir, true);
}

static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
				   int nents, enum dma_data_direction dir)
{
	int i, ents;
	struct scatterlist *s;

	for_each_sg(sg, s, nents, i)
		kmemcheck_mark_initialized(sg_virt(s), s->length);
	BUG_ON(!valid_dma_direction(dir));
	ents = or1k_map_sg(dev, sg, nents, dir, NULL);
	debug_dma_map_sg(dev, sg, nents, ents, dir);

	return ents;
}

static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
				      int nents, enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
	debug_dma_unmap_sg(dev, sg, nents, dir);
	or1k_unmap_sg(dev, sg, nents, dir, NULL);
}

static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
				      size_t offset, size_t size,
				      enum dma_data_direction dir)
{
	dma_addr_t addr;

	kmemcheck_mark_initialized(page_address(page) + offset, size);
	BUG_ON(!valid_dma_direction(dir));
	addr = or1k_map_page(dev, page, offset, size, dir, NULL);
	debug_dma_map_page(dev, page, offset, size, dir, addr, false);

	return addr;
}

static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
				  size_t size, enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
	or1k_unmap_page(dev, addr, size, dir, NULL);
	debug_dma_unmap_page(dev, addr, size, dir, true);
}

static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
					   size_t size,
					   enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
	or1k_sync_single_for_cpu(dev, addr, size, dir);
	debug_dma_sync_single_for_cpu(dev, addr, size, dir);
}

static inline void dma_sync_single_for_device(struct device *dev,
					      dma_addr_t addr, size_t size,
					      enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));
	or1k_sync_single_for_device(dev, addr, size, dir);
	debug_dma_sync_single_for_device(dev, addr, size, dir);
}

static inline int dma_supported(struct device *dev, u64 dma_mask)
{
	/* Support 32 bit DMA mask exclusively */
	return dma_mask == DMA_BIT_MASK(32);
}

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

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;
}
#endif	/* __ASM_OPENRISC_DMA_MAPPING_H */