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Stephen Rothwell78b09732005-11-19 01:40:46 +11001/*
2 * Copyright (C) 2004 IBM
3 *
4 * Implements the generic device dma API for powerpc.
5 * the pci and vio busses
6 */
7#ifndef _ASM_DMA_MAPPING_H
8#define _ASM_DMA_MAPPING_H
Arnd Bergmann88ced032005-12-16 22:43:46 +01009#ifdef __KERNEL__
Stephen Rothwell78b09732005-11-19 01:40:46 +110010
Stephen Rothwell78b09732005-11-19 01:40:46 +110011#include <linux/types.h>
12#include <linux/cache.h>
13/* need struct page definitions */
14#include <linux/mm.h>
15#include <asm/scatterlist.h>
16#include <asm/io.h>
Stephen Rothwell78b09732005-11-19 01:40:46 +110017
18#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
19
20#ifdef CONFIG_NOT_COHERENT_CACHE
21/*
22 * DMA-consistent mapping functions for PowerPCs that don't support
23 * cache snooping. These allocate/free a region of uncached mapped
24 * memory space for use with DMA devices. Alternatively, you could
25 * allocate the space "normally" and use the cache management functions
26 * to ensure it is consistent.
27 */
28extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
29extern void __dma_free_coherent(size_t size, void *vaddr);
30extern void __dma_sync(void *vaddr, size_t size, int direction);
31extern void __dma_sync_page(struct page *page, unsigned long offset,
32 size_t size, int direction);
33
34#else /* ! CONFIG_NOT_COHERENT_CACHE */
35/*
36 * Cache coherent cores.
37 */
38
39#define __dma_alloc_coherent(gfp, size, handle) NULL
Al Viro6a13f662007-01-30 13:24:00 +000040#define __dma_free_coherent(size, addr) ((void)0)
41#define __dma_sync(addr, size, rw) ((void)0)
42#define __dma_sync_page(pg, off, sz, rw) ((void)0)
Stephen Rothwell78b09732005-11-19 01:40:46 +110043
44#endif /* ! CONFIG_NOT_COHERENT_CACHE */
45
46#ifdef CONFIG_PPC64
Benjamin Herrenschmidt12d04ee2006-11-11 17:25:02 +110047/*
48 * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
49 */
50struct dma_mapping_ops {
51 void * (*alloc_coherent)(struct device *dev, size_t size,
52 dma_addr_t *dma_handle, gfp_t flag);
53 void (*free_coherent)(struct device *dev, size_t size,
54 void *vaddr, dma_addr_t dma_handle);
55 dma_addr_t (*map_single)(struct device *dev, void *ptr,
56 size_t size, enum dma_data_direction direction);
57 void (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
58 size_t size, enum dma_data_direction direction);
59 int (*map_sg)(struct device *dev, struct scatterlist *sg,
60 int nents, enum dma_data_direction direction);
61 void (*unmap_sg)(struct device *dev, struct scatterlist *sg,
62 int nents, enum dma_data_direction direction);
63 int (*dma_supported)(struct device *dev, u64 mask);
Benjamin Herrenschmidt12d04ee2006-11-11 17:25:02 +110064 int (*set_dma_mask)(struct device *dev, u64 dma_mask);
65};
Stephen Rothwell78b09732005-11-19 01:40:46 +110066
Benjamin Herrenschmidt12d04ee2006-11-11 17:25:02 +110067static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
68{
69 /* We don't handle the NULL dev case for ISA for now. We could
70 * do it via an out of line call but it is not needed for now. The
71 * only ISA DMA device we support is the floppy and we have a hack
72 * in the floppy driver directly to get a device for us.
73 */
74 if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
75 return NULL;
76 return dev->archdata.dma_ops;
77}
78
79static inline int dma_supported(struct device *dev, u64 mask)
80{
81 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
82
83 if (unlikely(dma_ops == NULL))
84 return 0;
85 if (dma_ops->dma_supported == NULL)
86 return 1;
87 return dma_ops->dma_supported(dev, mask);
88}
89
90static inline int dma_set_mask(struct device *dev, u64 dma_mask)
91{
92 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
93
94 if (unlikely(dma_ops == NULL))
95 return -EIO;
96 if (dma_ops->set_dma_mask != NULL)
97 return dma_ops->set_dma_mask(dev, dma_mask);
98 if (!dev->dma_mask || !dma_supported(dev, *dev->dma_mask))
99 return -EIO;
100 *dev->dma_mask = dma_mask;
101 return 0;
102}
103
104static inline void *dma_alloc_coherent(struct device *dev, size_t size,
105 dma_addr_t *dma_handle, gfp_t flag)
106{
107 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
108
109 BUG_ON(!dma_ops);
110 return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
111}
112
113static inline void dma_free_coherent(struct device *dev, size_t size,
114 void *cpu_addr, dma_addr_t dma_handle)
115{
116 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
117
118 BUG_ON(!dma_ops);
119 dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
120}
121
122static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
123 size_t size,
124 enum dma_data_direction direction)
125{
126 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
127
128 BUG_ON(!dma_ops);
129 return dma_ops->map_single(dev, cpu_addr, size, direction);
130}
131
132static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
133 size_t size,
134 enum dma_data_direction direction)
135{
136 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
137
138 BUG_ON(!dma_ops);
139 dma_ops->unmap_single(dev, dma_addr, size, direction);
140}
141
142static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
143 unsigned long offset, size_t size,
144 enum dma_data_direction direction)
145{
146 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
147
148 BUG_ON(!dma_ops);
149 return dma_ops->map_single(dev, page_address(page) + offset, size,
150 direction);
151}
152
153static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
154 size_t size,
155 enum dma_data_direction direction)
156{
157 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
158
159 BUG_ON(!dma_ops);
160 dma_ops->unmap_single(dev, dma_address, size, direction);
161}
162
163static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
164 int nents, enum dma_data_direction direction)
165{
166 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
167
168 BUG_ON(!dma_ops);
169 return dma_ops->map_sg(dev, sg, nents, direction);
170}
171
172static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
173 int nhwentries,
174 enum dma_data_direction direction)
175{
176 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
177
178 BUG_ON(!dma_ops);
179 dma_ops->unmap_sg(dev, sg, nhwentries, direction);
180}
181
182
183/*
184 * Available generic sets of operations
185 */
186extern struct dma_mapping_ops dma_iommu_ops;
187extern struct dma_mapping_ops dma_direct_ops;
Stephen Rothwell78b09732005-11-19 01:40:46 +1100188
Benjamin Herrenschmidt92b20c42006-11-11 17:25:14 +1100189extern unsigned long dma_direct_offset;
190
Stephen Rothwell78b09732005-11-19 01:40:46 +1100191#else /* CONFIG_PPC64 */
192
193#define dma_supported(dev, mask) (1)
194
195static inline int dma_set_mask(struct device *dev, u64 dma_mask)
196{
197 if (!dev->dma_mask || !dma_supported(dev, mask))
198 return -EIO;
199
200 *dev->dma_mask = dma_mask;
201
202 return 0;
203}
204
205static inline void *dma_alloc_coherent(struct device *dev, size_t size,
206 dma_addr_t * dma_handle,
207 gfp_t gfp)
208{
209#ifdef CONFIG_NOT_COHERENT_CACHE
210 return __dma_alloc_coherent(size, dma_handle, gfp);
211#else
212 void *ret;
213 /* ignore region specifiers */
214 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
215
216 if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
217 gfp |= GFP_DMA;
218
219 ret = (void *)__get_free_pages(gfp, get_order(size));
220
221 if (ret != NULL) {
222 memset(ret, 0, size);
223 *dma_handle = virt_to_bus(ret);
224 }
225
226 return ret;
227#endif
228}
229
230static inline void
231dma_free_coherent(struct device *dev, size_t size, void *vaddr,
232 dma_addr_t dma_handle)
233{
234#ifdef CONFIG_NOT_COHERENT_CACHE
235 __dma_free_coherent(size, vaddr);
236#else
237 free_pages((unsigned long)vaddr, get_order(size));
238#endif
239}
240
241static inline dma_addr_t
242dma_map_single(struct device *dev, void *ptr, size_t size,
243 enum dma_data_direction direction)
244{
245 BUG_ON(direction == DMA_NONE);
246
247 __dma_sync(ptr, size, direction);
248
249 return virt_to_bus(ptr);
250}
251
252/* We do nothing. */
Al Viro6a13f662007-01-30 13:24:00 +0000253#define dma_unmap_single(dev, addr, size, dir) ((void)0)
Stephen Rothwell78b09732005-11-19 01:40:46 +1100254
255static inline dma_addr_t
256dma_map_page(struct device *dev, struct page *page,
257 unsigned long offset, size_t size,
258 enum dma_data_direction direction)
259{
260 BUG_ON(direction == DMA_NONE);
261
262 __dma_sync_page(page, offset, size, direction);
263
264 return page_to_bus(page) + offset;
265}
266
267/* We do nothing. */
Al Viro6a13f662007-01-30 13:24:00 +0000268#define dma_unmap_page(dev, handle, size, dir) ((void)0)
Stephen Rothwell78b09732005-11-19 01:40:46 +1100269
270static inline int
271dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
272 enum dma_data_direction direction)
273{
274 int i;
275
276 BUG_ON(direction == DMA_NONE);
277
278 for (i = 0; i < nents; i++, sg++) {
279 BUG_ON(!sg->page);
280 __dma_sync_page(sg->page, sg->offset, sg->length, direction);
281 sg->dma_address = page_to_bus(sg->page) + sg->offset;
282 }
283
284 return nents;
285}
286
287/* We don't do anything here. */
Al Viro6a13f662007-01-30 13:24:00 +0000288#define dma_unmap_sg(dev, sg, nents, dir) ((void)0)
Stephen Rothwell78b09732005-11-19 01:40:46 +1100289
290#endif /* CONFIG_PPC64 */
291
292static inline void dma_sync_single_for_cpu(struct device *dev,
293 dma_addr_t dma_handle, size_t size,
294 enum dma_data_direction direction)
295{
296 BUG_ON(direction == DMA_NONE);
297 __dma_sync(bus_to_virt(dma_handle), size, direction);
298}
299
300static inline void dma_sync_single_for_device(struct device *dev,
301 dma_addr_t dma_handle, size_t size,
302 enum dma_data_direction direction)
303{
304 BUG_ON(direction == DMA_NONE);
305 __dma_sync(bus_to_virt(dma_handle), size, direction);
306}
307
308static inline void dma_sync_sg_for_cpu(struct device *dev,
309 struct scatterlist *sg, int nents,
310 enum dma_data_direction direction)
311{
312 int i;
313
314 BUG_ON(direction == DMA_NONE);
315
316 for (i = 0; i < nents; i++, sg++)
317 __dma_sync_page(sg->page, sg->offset, sg->length, direction);
318}
319
320static inline void dma_sync_sg_for_device(struct device *dev,
321 struct scatterlist *sg, int nents,
322 enum dma_data_direction direction)
323{
324 int i;
325
326 BUG_ON(direction == DMA_NONE);
327
328 for (i = 0; i < nents; i++, sg++)
329 __dma_sync_page(sg->page, sg->offset, sg->length, direction);
330}
331
332static inline int dma_mapping_error(dma_addr_t dma_addr)
333{
334#ifdef CONFIG_PPC64
335 return (dma_addr == DMA_ERROR_CODE);
336#else
337 return 0;
338#endif
339}
340
341#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
342#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
343#ifdef CONFIG_NOT_COHERENT_CACHE
Ralf Baechlef67637e2006-12-06 20:38:54 -0800344#define dma_is_consistent(d, h) (0)
Stephen Rothwell78b09732005-11-19 01:40:46 +1100345#else
Ralf Baechlef67637e2006-12-06 20:38:54 -0800346#define dma_is_consistent(d, h) (1)
Stephen Rothwell78b09732005-11-19 01:40:46 +1100347#endif
348
349static inline int dma_get_cache_alignment(void)
350{
351#ifdef CONFIG_PPC64
352 /* no easy way to get cache size on all processors, so return
353 * the maximum possible, to be safe */
Ravikiran G Thirumalai1fd73c62006-01-08 01:01:28 -0800354 return (1 << INTERNODE_CACHE_SHIFT);
Stephen Rothwell78b09732005-11-19 01:40:46 +1100355#else
356 /*
357 * Each processor family will define its own L1_CACHE_SHIFT,
358 * L1_CACHE_BYTES wraps to this, so this is always safe.
359 */
360 return L1_CACHE_BYTES;
361#endif
362}
363
364static inline void dma_sync_single_range_for_cpu(struct device *dev,
365 dma_addr_t dma_handle, unsigned long offset, size_t size,
366 enum dma_data_direction direction)
367{
368 /* just sync everything for now */
369 dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
370}
371
372static inline void dma_sync_single_range_for_device(struct device *dev,
373 dma_addr_t dma_handle, unsigned long offset, size_t size,
374 enum dma_data_direction direction)
375{
376 /* just sync everything for now */
377 dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
378}
379
Ralf Baechled3fa72e2006-12-06 20:38:56 -0800380static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
Stephen Rothwell78b09732005-11-19 01:40:46 +1100381 enum dma_data_direction direction)
382{
383 BUG_ON(direction == DMA_NONE);
384 __dma_sync(vaddr, size, (int)direction);
385}
386
Arnd Bergmann88ced032005-12-16 22:43:46 +0100387#endif /* __KERNEL__ */
Stephen Rothwell78b09732005-11-19 01:40:46 +1100388#endif /* _ASM_DMA_MAPPING_H */