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11#include <linux/types.h>
12#include <linux/dma-mapping.h>
13#include <linux/mm.h>
14#include <linux/module.h>
15#include <linux/scatterlist.h>
16#include <linux/string.h>
17#include <linux/gfp.h>
18
19#include <asm/cache.h>
20#include <asm/io.h>
21
22#include <dma-coherence.h>
23
24static inline unsigned long dma_addr_to_virt(struct device *dev,
25 dma_addr_t dma_addr)
26{
27 unsigned long addr = plat_dma_addr_to_phys(dev, dma_addr);
28
29 return (unsigned long)phys_to_virt(addr);
30}
31
32
33
34
35
36
37
38static inline int cpu_is_noncoherent_r10000(struct device *dev)
39{
40 return !plat_device_is_coherent(dev) &&
41 (current_cpu_type() == CPU_R10000 ||
42 current_cpu_type() == CPU_R12000);
43}
44
45static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
46{
47 gfp_t dma_flag;
48
49
50 gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
51
52#ifdef CONFIG_ISA
53 if (dev == NULL)
54 dma_flag = __GFP_DMA;
55 else
56#endif
57#if defined(CONFIG_ZONE_DMA32) && defined(CONFIG_ZONE_DMA)
58 if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
59 dma_flag = __GFP_DMA;
60 else if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
61 dma_flag = __GFP_DMA32;
62 else
63#endif
64#if defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_ZONE_DMA)
65 if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
66 dma_flag = __GFP_DMA32;
67 else
68#endif
69#if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32)
70 if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
71 dma_flag = __GFP_DMA;
72 else
73#endif
74 dma_flag = 0;
75
76
77 gfp |= __GFP_NORETRY;
78
79 return gfp | dma_flag;
80}
81
82void *dma_alloc_noncoherent(struct device *dev, size_t size,
83 dma_addr_t * dma_handle, gfp_t gfp)
84{
85 void *ret;
86
87 gfp = massage_gfp_flags(dev, gfp);
88
89 ret = (void *) __get_free_pages(gfp, get_order(size));
90
91 if (ret != NULL) {
92 memset(ret, 0, size);
93 *dma_handle = plat_map_dma_mem(dev, ret, size);
94 }
95
96 return ret;
97}
98EXPORT_SYMBOL(dma_alloc_noncoherent);
99
100static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
101 dma_addr_t * dma_handle, gfp_t gfp)
102{
103 void *ret;
104
105 if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
106 return ret;
107
108 gfp = massage_gfp_flags(dev, gfp);
109
110 ret = (void *) __get_free_pages(gfp, get_order(size));
111
112 if (ret) {
113 memset(ret, 0, size);
114 *dma_handle = plat_map_dma_mem(dev, ret, size);
115
116 if (!plat_device_is_coherent(dev)) {
117 dma_cache_wback_inv((unsigned long) ret, size);
118 ret = UNCAC_ADDR(ret);
119 }
120 }
121
122 return ret;
123}
124
125
126void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
127 dma_addr_t dma_handle)
128{
129 plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
130 free_pages((unsigned long) vaddr, get_order(size));
131}
132EXPORT_SYMBOL(dma_free_noncoherent);
133
134static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
135 dma_addr_t dma_handle)
136{
137 unsigned long addr = (unsigned long) vaddr;
138 int order = get_order(size);
139
140 if (dma_release_from_coherent(dev, order, vaddr))
141 return;
142
143 plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
144
145 if (!plat_device_is_coherent(dev))
146 addr = CAC_ADDR(addr);
147
148 free_pages(addr, get_order(size));
149}
150
151static inline void __dma_sync(unsigned long addr, size_t size,
152 enum dma_data_direction direction)
153{
154 switch (direction) {
155 case DMA_TO_DEVICE:
156 dma_cache_wback(addr, size);
157 break;
158
159 case DMA_FROM_DEVICE:
160 dma_cache_inv(addr, size);
161 break;
162
163 case DMA_BIDIRECTIONAL:
164 dma_cache_wback_inv(addr, size);
165 break;
166
167 default:
168 BUG();
169 }
170}
171
172static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
173 size_t size, enum dma_data_direction direction, struct dma_attrs *attrs)
174{
175 if (cpu_is_noncoherent_r10000(dev))
176 __dma_sync(dma_addr_to_virt(dev, dma_addr), size,
177 direction);
178
179 plat_unmap_dma_mem(dev, dma_addr, size, direction);
180}
181
182static int mips_dma_map_sg(struct device *dev, struct scatterlist *sg,
183 int nents, enum dma_data_direction direction, struct dma_attrs *attrs)
184{
185 int i;
186
187 for (i = 0; i < nents; i++, sg++) {
188 unsigned long addr;
189
190 addr = (unsigned long) sg_virt(sg);
191 if (!plat_device_is_coherent(dev) && addr)
192 __dma_sync(addr, sg->length, direction);
193 sg->dma_address = plat_map_dma_mem(dev,
194 (void *)addr, sg->length);
195 }
196
197 return nents;
198}
199
200static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page,
201 unsigned long offset, size_t size, enum dma_data_direction direction,
202 struct dma_attrs *attrs)
203{
204 unsigned long addr;
205
206 addr = (unsigned long) page_address(page) + offset;
207
208 if (!plat_device_is_coherent(dev))
209 __dma_sync(addr, size, direction);
210
211 return plat_map_dma_mem(dev, (void *)addr, size);
212}
213
214static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
215 int nhwentries, enum dma_data_direction direction,
216 struct dma_attrs *attrs)
217{
218 unsigned long addr;
219 int i;
220
221 for (i = 0; i < nhwentries; i++, sg++) {
222 if (!plat_device_is_coherent(dev) &&
223 direction != DMA_TO_DEVICE) {
224 addr = (unsigned long) sg_virt(sg);
225 if (addr)
226 __dma_sync(addr, sg->length, direction);
227 }
228 plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
229 }
230}
231
232static void mips_dma_sync_single_for_cpu(struct device *dev,
233 dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
234{
235 if (cpu_is_noncoherent_r10000(dev)) {
236 unsigned long addr;
237
238 addr = dma_addr_to_virt(dev, dma_handle);
239 __dma_sync(addr, size, direction);
240 }
241}
242
243static void mips_dma_sync_single_for_device(struct device *dev,
244 dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
245{
246 plat_extra_sync_for_device(dev);
247 if (!plat_device_is_coherent(dev)) {
248 unsigned long addr;
249
250 addr = dma_addr_to_virt(dev, dma_handle);
251 __dma_sync(addr, size, direction);
252 }
253}
254
255static void mips_dma_sync_sg_for_cpu(struct device *dev,
256 struct scatterlist *sg, int nelems, enum dma_data_direction direction)
257{
258 int i;
259
260
261 for (i = 0; i < nelems; i++, sg++) {
262 if (cpu_is_noncoherent_r10000(dev))
263 __dma_sync((unsigned long)page_address(sg_page(sg)),
264 sg->length, direction);
265 }
266}
267
268static void mips_dma_sync_sg_for_device(struct device *dev,
269 struct scatterlist *sg, int nelems, enum dma_data_direction direction)
270{
271 int i;
272
273
274 for (i = 0; i < nelems; i++, sg++) {
275 if (!plat_device_is_coherent(dev))
276 __dma_sync((unsigned long)page_address(sg_page(sg)),
277 sg->length, direction);
278 }
279}
280
281int mips_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
282{
283 return plat_dma_mapping_error(dev, dma_addr);
284}
285
286int mips_dma_supported(struct device *dev, u64 mask)
287{
288 return plat_dma_supported(dev, mask);
289}
290
291void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
292 enum dma_data_direction direction)
293{
294 BUG_ON(direction == DMA_NONE);
295
296 plat_extra_sync_for_device(dev);
297 if (!plat_device_is_coherent(dev))
298 __dma_sync((unsigned long)vaddr, size, direction);
299}
300
301EXPORT_SYMBOL(dma_cache_sync);
302
303static struct dma_map_ops mips_default_dma_map_ops = {
304 .alloc_coherent = mips_dma_alloc_coherent,
305 .free_coherent = mips_dma_free_coherent,
306 .map_page = mips_dma_map_page,
307 .unmap_page = mips_dma_unmap_page,
308 .map_sg = mips_dma_map_sg,
309 .unmap_sg = mips_dma_unmap_sg,
310 .sync_single_for_cpu = mips_dma_sync_single_for_cpu,
311 .sync_single_for_device = mips_dma_sync_single_for_device,
312 .sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
313 .sync_sg_for_device = mips_dma_sync_sg_for_device,
314 .mapping_error = mips_dma_mapping_error,
315 .dma_supported = mips_dma_supported
316};
317
318struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;
319EXPORT_SYMBOL(mips_dma_map_ops);
320
321#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
322
323static int __init mips_dma_init(void)
324{
325 dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
326
327 return 0;
328}
329fs_initcall(mips_dma_init);
330
