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
|
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <asm/dma-mapping.h>
static dma_addr_t pci32_map_single(struct device *dev, phys_addr_t ptr,
size_t size, int direction)
{
WARN_ON(size == 0);
flush_write_buffers();
return ptr;
}
static int pci32_dma_map_sg(struct device *dev, struct scatterlist *sglist,
int nents, int direction)
{
struct scatterlist *sg;
int i;
WARN_ON(nents == 0 || sglist[0].length == 0);
for_each_sg(sglist, sg, nents, i) {
BUG_ON(!sg_page(sg));
sg->dma_address = sg_phys(sg);
sg->dma_length = sg->length;
}
flush_write_buffers();
return nents;
}
/* Make sure we keep the same behaviour */
static int pci32_map_error(dma_addr_t dma_addr)
{
return 0;
}
const struct dma_mapping_ops pci32_dma_ops = {
.map_single = pci32_map_single,
.unmap_single = NULL,
.map_sg = pci32_dma_map_sg,
.unmap_sg = NULL,
.sync_single_for_cpu = NULL,
.sync_single_for_device = NULL,
.sync_single_range_for_cpu = NULL,
.sync_single_range_for_device = NULL,
.sync_sg_for_cpu = NULL,
.sync_sg_for_device = NULL,
.mapping_error = pci32_map_error,
};
/* this is temporary */
int __init no_iommu_init(void)
{
dma_ops = &pci32_dma_ops;
return 0;
}
fs_initcall(no_iommu_init);
|
