2 * Copyright (C) 2004 IBM
4 * Implements the generic device dma API for powerpc.
5 * the pci and vio busses
7 #ifndef _ASM_DMA_MAPPING_H
8 #define _ASM_DMA_MAPPING_H
11 #include <linux/types.h>
12 #include <linux/cache.h>
13 /* need struct page definitions */
15 #include <linux/scatterlist.h>
16 #include <linux/dma-attrs.h>
19 #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
21 #ifdef CONFIG_NOT_COHERENT_CACHE
23 * DMA-consistent mapping functions for PowerPCs that don't support
24 * cache snooping. These allocate/free a region of uncached mapped
25 * memory space for use with DMA devices. Alternatively, you could
26 * allocate the space "normally" and use the cache management functions
27 * to ensure it is consistent.
29 extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
30 extern void __dma_free_coherent(size_t size, void *vaddr);
31 extern void __dma_sync(void *vaddr, size_t size, int direction);
32 extern void __dma_sync_page(struct page *page, unsigned long offset,
33 size_t size, int direction);
35 #else /* ! CONFIG_NOT_COHERENT_CACHE */
37 * Cache coherent cores.
40 #define __dma_alloc_coherent(gfp, size, handle) NULL
41 #define __dma_free_coherent(size, addr) ((void)0)
42 #define __dma_sync(addr, size, rw) ((void)0)
43 #define __dma_sync_page(pg, off, sz, rw) ((void)0)
45 #endif /* ! CONFIG_NOT_COHERENT_CACHE */
49 static inline unsigned long device_to_mask(struct device *dev)
51 if (dev->dma_mask && *dev->dma_mask)
52 return *dev->dma_mask;
53 /* Assume devices without mask can take 32 bit addresses */
58 * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
60 struct dma_mapping_ops {
61 void * (*alloc_coherent)(struct device *dev, size_t size,
62 dma_addr_t *dma_handle, gfp_t flag);
63 void (*free_coherent)(struct device *dev, size_t size,
64 void *vaddr, dma_addr_t dma_handle);
65 dma_addr_t (*map_single)(struct device *dev, void *ptr,
66 size_t size, enum dma_data_direction direction,
67 struct dma_attrs *attrs);
68 void (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
69 size_t size, enum dma_data_direction direction,
70 struct dma_attrs *attrs);
71 int (*map_sg)(struct device *dev, struct scatterlist *sg,
72 int nents, enum dma_data_direction direction,
73 struct dma_attrs *attrs);
74 void (*unmap_sg)(struct device *dev, struct scatterlist *sg,
75 int nents, enum dma_data_direction direction,
76 struct dma_attrs *attrs);
77 int (*dma_supported)(struct device *dev, u64 mask);
78 int (*set_dma_mask)(struct device *dev, u64 dma_mask);
81 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
83 /* We don't handle the NULL dev case for ISA for now. We could
84 * do it via an out of line call but it is not needed for now. The
85 * only ISA DMA device we support is the floppy and we have a hack
86 * in the floppy driver directly to get a device for us.
88 if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
90 return dev->archdata.dma_ops;
93 static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
95 dev->archdata.dma_ops = ops;
98 static inline int dma_supported(struct device *dev, u64 mask)
100 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
102 if (unlikely(dma_ops == NULL))
104 if (dma_ops->dma_supported == NULL)
106 return dma_ops->dma_supported(dev, mask);
109 /* We have our own implementation of pci_set_dma_mask() */
110 #define HAVE_ARCH_PCI_SET_DMA_MASK
112 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
114 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
116 if (unlikely(dma_ops == NULL))
118 if (dma_ops->set_dma_mask != NULL)
119 return dma_ops->set_dma_mask(dev, dma_mask);
120 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
122 *dev->dma_mask = dma_mask;
126 static inline dma_addr_t dma_map_single_attrs(struct device *dev,
129 enum dma_data_direction direction,
130 struct dma_attrs *attrs)
132 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
135 return dma_ops->map_single(dev, cpu_addr, size, direction, attrs);
138 static inline void dma_unmap_single_attrs(struct device *dev,
141 enum dma_data_direction direction,
142 struct dma_attrs *attrs)
144 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
147 dma_ops->unmap_single(dev, dma_addr, size, direction, attrs);
150 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
152 unsigned long offset, size_t size,
153 enum dma_data_direction direction,
154 struct dma_attrs *attrs)
156 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
159 return dma_ops->map_single(dev, page_address(page) + offset, size,
163 static inline void dma_unmap_page_attrs(struct device *dev,
164 dma_addr_t dma_address,
166 enum dma_data_direction direction,
167 struct dma_attrs *attrs)
169 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
172 dma_ops->unmap_single(dev, dma_address, size, direction, attrs);
175 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
176 int nents, enum dma_data_direction direction,
177 struct dma_attrs *attrs)
179 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
182 return dma_ops->map_sg(dev, sg, nents, direction, attrs);
185 static inline void dma_unmap_sg_attrs(struct device *dev,
186 struct scatterlist *sg,
188 enum dma_data_direction direction,
189 struct dma_attrs *attrs)
191 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
194 dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
197 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
198 dma_addr_t *dma_handle, gfp_t flag)
200 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
203 return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
206 static inline void dma_free_coherent(struct device *dev, size_t size,
207 void *cpu_addr, dma_addr_t dma_handle)
209 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
212 dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
215 static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
217 enum dma_data_direction direction)
219 return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
222 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
224 enum dma_data_direction direction)
226 dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
229 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
230 unsigned long offset, size_t size,
231 enum dma_data_direction direction)
233 return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
236 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
238 enum dma_data_direction direction)
240 dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
243 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
244 int nents, enum dma_data_direction direction)
246 return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
249 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
251 enum dma_data_direction direction)
253 dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
257 * Available generic sets of operations
259 extern struct dma_mapping_ops dma_iommu_ops;
260 extern struct dma_mapping_ops dma_direct_ops;
262 #else /* CONFIG_PPC64 */
264 #define dma_supported(dev, mask) (1)
266 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
268 if (!dev->dma_mask || !dma_supported(dev, mask))
271 *dev->dma_mask = dma_mask;
276 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
277 dma_addr_t * dma_handle,
280 #ifdef CONFIG_NOT_COHERENT_CACHE
281 return __dma_alloc_coherent(size, dma_handle, gfp);
284 /* ignore region specifiers */
285 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
287 if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
290 ret = (void *)__get_free_pages(gfp, get_order(size));
293 memset(ret, 0, size);
294 *dma_handle = virt_to_bus(ret);
302 dma_free_coherent(struct device *dev, size_t size, void *vaddr,
303 dma_addr_t dma_handle)
305 #ifdef CONFIG_NOT_COHERENT_CACHE
306 __dma_free_coherent(size, vaddr);
308 free_pages((unsigned long)vaddr, get_order(size));
312 static inline dma_addr_t
313 dma_map_single(struct device *dev, void *ptr, size_t size,
314 enum dma_data_direction direction)
316 BUG_ON(direction == DMA_NONE);
318 __dma_sync(ptr, size, direction);
320 return virt_to_bus(ptr);
323 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
325 enum dma_data_direction direction)
330 static inline dma_addr_t
331 dma_map_page(struct device *dev, struct page *page,
332 unsigned long offset, size_t size,
333 enum dma_data_direction direction)
335 BUG_ON(direction == DMA_NONE);
337 __dma_sync_page(page, offset, size, direction);
339 return page_to_bus(page) + offset;
342 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
344 enum dma_data_direction direction)
350 dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
351 enum dma_data_direction direction)
353 struct scatterlist *sg;
356 BUG_ON(direction == DMA_NONE);
358 for_each_sg(sgl, sg, nents, i) {
359 BUG_ON(!sg_page(sg));
360 __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
361 sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
367 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
369 enum dma_data_direction direction)
371 /* We don't do anything here. */
374 #endif /* CONFIG_PPC64 */
376 static inline void dma_sync_single_for_cpu(struct device *dev,
377 dma_addr_t dma_handle, size_t size,
378 enum dma_data_direction direction)
380 BUG_ON(direction == DMA_NONE);
381 __dma_sync(bus_to_virt(dma_handle), size, direction);
384 static inline void dma_sync_single_for_device(struct device *dev,
385 dma_addr_t dma_handle, size_t size,
386 enum dma_data_direction direction)
388 BUG_ON(direction == DMA_NONE);
389 __dma_sync(bus_to_virt(dma_handle), size, direction);
392 static inline void dma_sync_sg_for_cpu(struct device *dev,
393 struct scatterlist *sgl, int nents,
394 enum dma_data_direction direction)
396 struct scatterlist *sg;
399 BUG_ON(direction == DMA_NONE);
401 for_each_sg(sgl, sg, nents, i)
402 __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
405 static inline void dma_sync_sg_for_device(struct device *dev,
406 struct scatterlist *sgl, int nents,
407 enum dma_data_direction direction)
409 struct scatterlist *sg;
412 BUG_ON(direction == DMA_NONE);
414 for_each_sg(sgl, sg, nents, i)
415 __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
418 static inline int dma_mapping_error(dma_addr_t dma_addr)
421 return (dma_addr == DMA_ERROR_CODE);
427 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
428 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
429 #ifdef CONFIG_NOT_COHERENT_CACHE
430 #define dma_is_consistent(d, h) (0)
432 #define dma_is_consistent(d, h) (1)
435 static inline int dma_get_cache_alignment(void)
438 /* no easy way to get cache size on all processors, so return
439 * the maximum possible, to be safe */
440 return (1 << INTERNODE_CACHE_SHIFT);
443 * Each processor family will define its own L1_CACHE_SHIFT,
444 * L1_CACHE_BYTES wraps to this, so this is always safe.
446 return L1_CACHE_BYTES;
450 static inline void dma_sync_single_range_for_cpu(struct device *dev,
451 dma_addr_t dma_handle, unsigned long offset, size_t size,
452 enum dma_data_direction direction)
454 /* just sync everything for now */
455 dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
458 static inline void dma_sync_single_range_for_device(struct device *dev,
459 dma_addr_t dma_handle, unsigned long offset, size_t size,
460 enum dma_data_direction direction)
462 /* just sync everything for now */
463 dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
466 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
467 enum dma_data_direction direction)
469 BUG_ON(direction == DMA_NONE);
470 __dma_sync(vaddr, size, (int)direction);
473 #endif /* __KERNEL__ */
474 #endif /* _ASM_DMA_MAPPING_H */