1
2
3
4
5
6
7#undef DEBUG
8
9#include <linux/dma-mapping.h>
10#include <linux/device.h>
11#include <linux/kernel.h>
12#include <linux/scatterlist.h>
13#include <linux/slab.h>
14#include <linux/vmalloc.h>
15#include <linux/export.h>
16
17#include <asm/pgalloc.h>
18
19#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
20
21static void *m68k_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
22 gfp_t flag, unsigned long attrs)
23{
24 struct page *page, **map;
25 pgprot_t pgprot;
26 void *addr;
27 int i, order;
28
29 pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
30
31 size = PAGE_ALIGN(size);
32 order = get_order(size);
33
34 page = alloc_pages(flag, order);
35 if (!page)
36 return NULL;
37
38 *handle = page_to_phys(page);
39 map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
40 if (!map) {
41 __free_pages(page, order);
42 return NULL;
43 }
44 split_page(page, order);
45
46 order = 1 << order;
47 size >>= PAGE_SHIFT;
48 map[0] = page;
49 for (i = 1; i < size; i++)
50 map[i] = page + i;
51 for (; i < order; i++)
52 __free_page(page + i);
53 pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
54 if (CPU_IS_040_OR_060)
55 pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
56 else
57 pgprot_val(pgprot) |= _PAGE_NOCACHE030;
58 addr = vmap(map, size, VM_MAP, pgprot);
59 kfree(map);
60
61 return addr;
62}
63
64static void m68k_dma_free(struct device *dev, size_t size, void *addr,
65 dma_addr_t handle, unsigned long attrs)
66{
67 pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
68 vfree(addr);
69}
70
71#else
72
73#include <asm/cacheflush.h>
74
75static void *m68k_dma_alloc(struct device *dev, size_t size,
76 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
77{
78 void *ret;
79
80 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
81 gfp |= GFP_DMA;
82 ret = (void *)__get_free_pages(gfp, get_order(size));
83
84 if (ret != NULL) {
85 memset(ret, 0, size);
86 *dma_handle = virt_to_phys(ret);
87 }
88 return ret;
89}
90
91static void m68k_dma_free(struct device *dev, size_t size, void *vaddr,
92 dma_addr_t dma_handle, unsigned long attrs)
93{
94 free_pages((unsigned long)vaddr, get_order(size));
95}
96
97#endif
98
99static void m68k_dma_sync_single_for_device(struct device *dev,
100 dma_addr_t handle, size_t size, enum dma_data_direction dir)
101{
102 switch (dir) {
103 case DMA_BIDIRECTIONAL:
104 case DMA_TO_DEVICE:
105 cache_push(handle, size);
106 break;
107 case DMA_FROM_DEVICE:
108 cache_clear(handle, size);
109 break;
110 default:
111 pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
112 dir);
113 break;
114 }
115}
116
117static void m68k_dma_sync_sg_for_device(struct device *dev,
118 struct scatterlist *sglist, int nents, enum dma_data_direction dir)
119{
120 int i;
121 struct scatterlist *sg;
122
123 for_each_sg(sglist, sg, nents, i) {
124 dma_sync_single_for_device(dev, sg->dma_address, sg->length,
125 dir);
126 }
127}
128
129static dma_addr_t m68k_dma_map_page(struct device *dev, struct page *page,
130 unsigned long offset, size_t size, enum dma_data_direction dir,
131 unsigned long attrs)
132{
133 dma_addr_t handle = page_to_phys(page) + offset;
134
135 if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
136 dma_sync_single_for_device(dev, handle, size, dir);
137
138 return handle;
139}
140
141static int m68k_dma_map_sg(struct device *dev, struct scatterlist *sglist,
142 int nents, enum dma_data_direction dir, unsigned long attrs)
143{
144 int i;
145 struct scatterlist *sg;
146
147 for_each_sg(sglist, sg, nents, i) {
148 sg->dma_address = sg_phys(sg);
149
150 if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
151 continue;
152
153 dma_sync_single_for_device(dev, sg->dma_address, sg->length,
154 dir);
155 }
156 return nents;
157}
158
159const struct dma_map_ops m68k_dma_ops = {
160 .alloc = m68k_dma_alloc,
161 .free = m68k_dma_free,
162 .map_page = m68k_dma_map_page,
163 .map_sg = m68k_dma_map_sg,
164 .sync_single_for_device = m68k_dma_sync_single_for_device,
165 .sync_sg_for_device = m68k_dma_sync_sg_for_device,
166};
167EXPORT_SYMBOL(m68k_dma_ops);
168
