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12#include <linux/types.h>
13#include <linux/slab.h>
14#include <linux/dma-mapping.h>
15#include <linux/list.h>
16#include <linux/pci.h>
17#include <asm/io.h>
18
19#if 1
20#define DMA_SRAM_START dma_coherent_mem_start
21#define DMA_SRAM_END dma_coherent_mem_end
22#else
23#define DMA_SRAM_START 0xe8900000
24#define DMA_SRAM_END 0xe8a00000
25#endif
26
27struct dma_alloc_record {
28 struct list_head list;
29 unsigned long ofs;
30 unsigned long len;
31};
32
33static DEFINE_SPINLOCK(dma_alloc_lock);
34static LIST_HEAD(dma_alloc_list);
35
36void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
37{
38 struct dma_alloc_record *new;
39 struct list_head *this = &dma_alloc_list;
40 unsigned long flags;
41 unsigned long start = DMA_SRAM_START;
42 unsigned long end;
43
44 if (!DMA_SRAM_START) {
45 printk("%s called without any DMA area reserved!\n", __func__);
46 return NULL;
47 }
48
49 new = kmalloc(sizeof (*new), GFP_ATOMIC);
50 if (!new)
51 return NULL;
52
53
54 new->len = (size + 31) & ~31;
55
56 spin_lock_irqsave(&dma_alloc_lock, flags);
57
58 list_for_each (this, &dma_alloc_list) {
59 struct dma_alloc_record *this_r = list_entry(this, struct dma_alloc_record, list);
60 end = this_r->ofs;
61
62 if (end - start >= size)
63 goto gotone;
64
65 start = this_r->ofs + this_r->len;
66 }
67
68 end = DMA_SRAM_END;
69 this = &dma_alloc_list;
70
71 if (end - start >= size) {
72 gotone:
73 new->ofs = start;
74 list_add_tail(&new->list, this);
75 spin_unlock_irqrestore(&dma_alloc_lock, flags);
76
77 *dma_handle = start;
78 return (void *)start;
79 }
80
81 kfree(new);
82 spin_unlock_irqrestore(&dma_alloc_lock, flags);
83 return NULL;
84}
85
86EXPORT_SYMBOL(dma_alloc_coherent);
87
88void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
89{
90 struct dma_alloc_record *rec;
91 unsigned long flags;
92
93 spin_lock_irqsave(&dma_alloc_lock, flags);
94
95 list_for_each_entry(rec, &dma_alloc_list, list) {
96 if (rec->ofs == dma_handle) {
97 list_del(&rec->list);
98 kfree(rec);
99 spin_unlock_irqrestore(&dma_alloc_lock, flags);
100 return;
101 }
102 }
103 spin_unlock_irqrestore(&dma_alloc_lock, flags);
104 BUG();
105}
106
107EXPORT_SYMBOL(dma_free_coherent);
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116dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
117 enum dma_data_direction direction)
118{
119 BUG_ON(direction == DMA_NONE);
120
121 frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
122
123 return virt_to_bus(ptr);
124}
125
126EXPORT_SYMBOL(dma_map_single);
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144int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
145 enum dma_data_direction direction)
146{
147 int i;
148
149 for (i=0; i<nents; i++)
150 frv_cache_wback_inv(sg_dma_address(&sg[i]),
151 sg_dma_address(&sg[i]) + sg_dma_len(&sg[i]));
152
153 BUG_ON(direction == DMA_NONE);
154
155 return nents;
156}
157
158EXPORT_SYMBOL(dma_map_sg);
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167dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
168 size_t size, enum dma_data_direction direction)
169{
170 BUG_ON(direction == DMA_NONE);
171 flush_dcache_page(page);
172 return (dma_addr_t) page_to_phys(page) + offset;
173}
174
175EXPORT_SYMBOL(dma_map_page);
176