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
|
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include <linux/swiotlb.h>
#include <linux/bootmem.h>
#include <asm/bootinfo.h>
#include <boot_param.h>
#include <dma-coherence.h>
static void *loongson_dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
{
void *ret;
if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
return ret;
/* ignore region specifiers */
gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
#ifdef CONFIG_ISA
if (dev == NULL)
gfp |= __GFP_DMA;
else
#endif
#ifdef CONFIG_ZONE_DMA
if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
gfp |= __GFP_DMA;
else
#endif
#ifdef CONFIG_ZONE_DMA32
if (dev->coherent_dma_mask < DMA_BIT_MASK(40))
gfp |= __GFP_DMA32;
else
#endif
;
gfp |= __GFP_NORETRY;
ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
mb();
return ret;
}
static void loongson_dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
{
int order = get_order(size);
if (dma_release_from_coherent(dev, order, vaddr))
return;
swiotlb_free_coherent(dev, size, vaddr, dma_handle);
}
static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
dir, attrs);
mb();
return daddr;
}
static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, NULL);
mb();
return r;
}
static void loongson_dma_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
{
swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
mb();
}
static void loongson_dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
swiotlb_sync_sg_for_device(dev, sg, nents, dir);
mb();
}
static int loongson_dma_set_mask(struct device *dev, u64 mask)
{
if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
*dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
return -EIO;
}
*dev->dma_mask = mask;
return 0;
}
dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
return paddr;
}
phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
{
return daddr;
}
static struct dma_map_ops loongson_dma_map_ops = {
.alloc = loongson_dma_alloc_coherent,
.free = loongson_dma_free_coherent,
.map_page = loongson_dma_map_page,
.unmap_page = swiotlb_unmap_page,
.map_sg = loongson_dma_map_sg,
.unmap_sg = swiotlb_unmap_sg_attrs,
.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
.sync_single_for_device = loongson_dma_sync_single_for_device,
.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
.sync_sg_for_device = loongson_dma_sync_sg_for_device,
.mapping_error = swiotlb_dma_mapping_error,
.dma_supported = swiotlb_dma_supported,
.set_dma_mask = loongson_dma_set_mask
};
void __init plat_swiotlb_setup(void)
{
swiotlb_init(1);
mips_dma_map_ops = &loongson_dma_map_ops;
}
|
