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
|
#ifndef _ASM_I386_DMA_MAPPING_H
#define _ASM_I386_DMA_MAPPING_H
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <asm/bug.h>
static inline dma_addr_t
dma_map_page(struct device *dev, struct page *page, unsigned long offset,
size_t size, enum dma_data_direction direction)
{
BUG_ON(!valid_dma_direction(direction));
return page_to_phys(page) + offset;
}
static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
enum dma_data_direction direction)
{
BUG_ON(!valid_dma_direction(direction));
}
static inline int
dma_mapping_error(dma_addr_t dma_addr)
{
return 0;
}
extern int forbid_dac;
static inline int
dma_supported(struct device *dev, u64 mask)
{
/*
* we fall back to GFP_DMA when the mask isn't all 1s,
* so we can't guarantee allocations that must be
* within a tighter range than GFP_DMA..
*/
if(mask < 0x00ffffff)
return 0;
/* Work around chipset bugs */
if (forbid_dac > 0 && mask > 0xffffffffULL)
return 0;
return 1;
}
static inline int
dma_set_mask(struct device *dev, u64 mask)
{
if(!dev->dma_mask || !dma_supported(dev, mask))
return -EIO;
*dev->dma_mask = mask;
return 0;
}
static inline int
dma_get_cache_alignment(void)
{
/* no easy way to get cache size on all x86, so return the
* maximum possible, to be safe */
return (1 << INTERNODE_CACHE_SHIFT);
}
#define dma_is_consistent(d, h) (1)
static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction)
{
flush_write_buffers();
}
#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
extern int
dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
dma_addr_t device_addr, size_t size, int flags);
extern void
dma_release_declared_memory(struct device *dev);
extern void *
dma_mark_declared_memory_occupied(struct device *dev,
dma_addr_t device_addr, size_t size);
#endif
|
