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
|
/*
* Implements the generic device dma API for microblaze and the pci
*
* Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2009-2010 PetaLogix
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
* This file is base on powerpc and x86 dma-mapping.h versions
* Copyright (C) 2004 IBM
*/
#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
#define _ASM_MICROBLAZE_DMA_MAPPING_H
/*
* See Documentation/PCI/PCI-DMA-mapping.txt and
* Documentation/DMA-API.txt for documentation.
*/
#include <linux/types.h>
#include <linux/cache.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/dma-debug.h>
#include <linux/dma-attrs.h>
#include <asm/io.h>
#include <asm-generic/dma-coherent.h>
#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
#define __dma_free_coherent(size, addr) ((void)0)
#define __dma_sync(addr, size, rw) ((void)0)
#define __dma_sync_page(pg, off, sz, rw) ((void)0)
static inline unsigned long device_to_mask(struct device *dev)
{
if (dev->dma_mask && *dev->dma_mask)
return *dev->dma_mask;
/* Assume devices without mask can take 32 bit addresses */
return 0xfffffffful;
}
extern struct dma_map_ops *dma_ops;
/*
* Available generic sets of operations
*/
extern struct dma_map_ops dma_direct_ops;
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
/* We don't handle the NULL dev case for ISA for now. We could
* do it via an out of line call but it is not needed for now. The
* only ISA DMA device we support is the floppy and we have a hack
* in the floppy driver directly to get a device for us.
*/
if (unlikely(!dev) || !dev->archdata.dma_ops)
return NULL;
return dev->archdata.dma_ops;
}
static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
{
dev->archdata.dma_ops = ops;
}
static inline int dma_supported(struct device *dev, u64 mask)
{
struct dma_map_ops *ops = get_dma_ops(dev);
if (unlikely(!ops))
return 0;
if (!ops->dma_supported)
return 1;
return ops->dma_supported(dev, mask);
}
#ifdef CONFIG_PCI
/* We have our own implementation of pci_set_dma_mask() */
#define HAVE_ARCH_PCI_SET_DMA_MASK
#endif
static inline int dma_set_mask(struct device *dev, u64 dma_mask)
{
struct dma_map_ops *ops = get_dma_ops(dev);
if (unlikely(ops == NULL))
return -EIO;
if (ops->set_dma_mask)
return ops->set_dma_mask(dev, dma_mask);
if (!dev->dma_mask || !dma_supported(dev, dma_mask))
return -EIO;
*dev->dma_mask = dma_mask;
return 0;
}
#include <asm-generic/dma-mapping-common.h>
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
struct dma_map_ops *ops = get_dma_ops(dev);
if (ops->mapping_error)
return ops->mapping_error(dev, dma_addr);
return (dma_addr == DMA_ERROR_CODE);
}
#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_is_consistent(d, h) (1)
static inline void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
struct dma_map_ops *ops = get_dma_ops(dev);
void *memory;
BUG_ON(!ops);
memory = ops->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)
{
struct dma_map_ops *ops = get_dma_ops(dev);
BUG_ON(!ops);
debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
ops->free_coherent(dev, size, cpu_addr, dma_handle);
}
static inline int dma_get_cache_alignment(void)
{
return L1_CACHE_BYTES;
}
static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
__dma_sync(vaddr, size, (int)direction);
}
#endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */
|
