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>
18 #include <asm/swiotlb.h>
20 #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
22 /* Some dma direct funcs must be visible for use in other dma_ops */
23 extern void *dma_direct_alloc_coherent(struct device
*dev
, size_t size
,
24 dma_addr_t
*dma_handle
, gfp_t flag
);
25 extern void dma_direct_free_coherent(struct device
*dev
, size_t size
,
26 void *vaddr
, dma_addr_t dma_handle
);
28 extern unsigned long get_dma_direct_offset(struct device
*dev
);
30 #ifdef CONFIG_NOT_COHERENT_CACHE
32 * DMA-consistent mapping functions for PowerPCs that don't support
33 * cache snooping. These allocate/free a region of uncached mapped
34 * memory space for use with DMA devices. Alternatively, you could
35 * allocate the space "normally" and use the cache management functions
36 * to ensure it is consistent.
39 extern void *__dma_alloc_coherent(struct device
*dev
, size_t size
,
40 dma_addr_t
*handle
, gfp_t gfp
);
41 extern void __dma_free_coherent(size_t size
, void *vaddr
);
42 extern void __dma_sync(void *vaddr
, size_t size
, int direction
);
43 extern void __dma_sync_page(struct page
*page
, unsigned long offset
,
44 size_t size
, int direction
);
46 #else /* ! CONFIG_NOT_COHERENT_CACHE */
48 * Cache coherent cores.
51 #define __dma_alloc_coherent(dev, gfp, size, handle) NULL
52 #define __dma_free_coherent(size, addr) ((void)0)
53 #define __dma_sync(addr, size, rw) ((void)0)
54 #define __dma_sync_page(pg, off, sz, rw) ((void)0)
56 #endif /* ! CONFIG_NOT_COHERENT_CACHE */
58 static inline unsigned long device_to_mask(struct device
*dev
)
60 if (dev
->dma_mask
&& *dev
->dma_mask
)
61 return *dev
->dma_mask
;
62 /* Assume devices without mask can take 32 bit addresses */
67 * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
69 struct dma_mapping_ops
{
70 void * (*alloc_coherent
)(struct device
*dev
, size_t size
,
71 dma_addr_t
*dma_handle
, gfp_t flag
);
72 void (*free_coherent
)(struct device
*dev
, size_t size
,
73 void *vaddr
, dma_addr_t dma_handle
);
74 int (*map_sg
)(struct device
*dev
, struct scatterlist
*sg
,
75 int nents
, enum dma_data_direction direction
,
76 struct dma_attrs
*attrs
);
77 void (*unmap_sg
)(struct device
*dev
, struct scatterlist
*sg
,
78 int nents
, enum dma_data_direction direction
,
79 struct dma_attrs
*attrs
);
80 int (*dma_supported
)(struct device
*dev
, u64 mask
);
81 int (*set_dma_mask
)(struct device
*dev
, u64 dma_mask
);
82 dma_addr_t (*map_page
)(struct device
*dev
, struct page
*page
,
83 unsigned long offset
, size_t size
,
84 enum dma_data_direction direction
,
85 struct dma_attrs
*attrs
);
86 void (*unmap_page
)(struct device
*dev
,
87 dma_addr_t dma_address
, size_t size
,
88 enum dma_data_direction direction
,
89 struct dma_attrs
*attrs
);
90 int (*addr_needs_map
)(struct device
*dev
, dma_addr_t addr
,
92 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
93 void (*sync_single_range_for_cpu
)(struct device
*hwdev
,
94 dma_addr_t dma_handle
, unsigned long offset
,
96 enum dma_data_direction direction
);
97 void (*sync_single_range_for_device
)(struct device
*hwdev
,
98 dma_addr_t dma_handle
, unsigned long offset
,
100 enum dma_data_direction direction
);
101 void (*sync_sg_for_cpu
)(struct device
*hwdev
,
102 struct scatterlist
*sg
, int nelems
,
103 enum dma_data_direction direction
);
104 void (*sync_sg_for_device
)(struct device
*hwdev
,
105 struct scatterlist
*sg
, int nelems
,
106 enum dma_data_direction direction
);
111 * Available generic sets of operations
114 extern struct dma_mapping_ops dma_iommu_ops
;
116 extern struct dma_mapping_ops dma_direct_ops
;
118 static inline struct dma_mapping_ops
*get_dma_ops(struct device
*dev
)
120 /* We don't handle the NULL dev case for ISA for now. We could
121 * do it via an out of line call but it is not needed for now. The
122 * only ISA DMA device we support is the floppy and we have a hack
123 * in the floppy driver directly to get a device for us.
125 if (unlikely(dev
== NULL
))
128 return dev
->archdata
.dma_ops
;
131 static inline void set_dma_ops(struct device
*dev
, struct dma_mapping_ops
*ops
)
133 dev
->archdata
.dma_ops
= ops
;
136 static inline int dma_supported(struct device
*dev
, u64 mask
)
138 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
140 if (unlikely(dma_ops
== NULL
))
142 if (dma_ops
->dma_supported
== NULL
)
144 return dma_ops
->dma_supported(dev
, mask
);
147 /* We have our own implementation of pci_set_dma_mask() */
148 #define HAVE_ARCH_PCI_SET_DMA_MASK
150 static inline int dma_set_mask(struct device
*dev
, u64 dma_mask
)
152 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
154 if (unlikely(dma_ops
== NULL
))
156 if (dma_ops
->set_dma_mask
!= NULL
)
157 return dma_ops
->set_dma_mask(dev
, dma_mask
);
158 if (!dev
->dma_mask
|| !dma_supported(dev
, dma_mask
))
160 *dev
->dma_mask
= dma_mask
;
165 * map_/unmap_single actually call through to map/unmap_page now that all the
166 * dma_mapping_ops have been converted over. We just have to get the page and
167 * offset to pass through to map_page
169 static inline dma_addr_t
dma_map_single_attrs(struct device
*dev
,
172 enum dma_data_direction direction
,
173 struct dma_attrs
*attrs
)
175 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
179 return dma_ops
->map_page(dev
, virt_to_page(cpu_addr
),
180 (unsigned long)cpu_addr
% PAGE_SIZE
, size
,
184 static inline void dma_unmap_single_attrs(struct device
*dev
,
187 enum dma_data_direction direction
,
188 struct dma_attrs
*attrs
)
190 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
194 dma_ops
->unmap_page(dev
, dma_addr
, size
, direction
, attrs
);
197 static inline dma_addr_t
dma_map_page_attrs(struct device
*dev
,
199 unsigned long offset
, size_t size
,
200 enum dma_data_direction direction
,
201 struct dma_attrs
*attrs
)
203 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
207 return dma_ops
->map_page(dev
, page
, offset
, size
, direction
, attrs
);
210 static inline void dma_unmap_page_attrs(struct device
*dev
,
211 dma_addr_t dma_address
,
213 enum dma_data_direction direction
,
214 struct dma_attrs
*attrs
)
216 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
220 dma_ops
->unmap_page(dev
, dma_address
, size
, direction
, attrs
);
223 static inline int dma_map_sg_attrs(struct device
*dev
, struct scatterlist
*sg
,
224 int nents
, enum dma_data_direction direction
,
225 struct dma_attrs
*attrs
)
227 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
230 return dma_ops
->map_sg(dev
, sg
, nents
, direction
, attrs
);
233 static inline void dma_unmap_sg_attrs(struct device
*dev
,
234 struct scatterlist
*sg
,
236 enum dma_data_direction direction
,
237 struct dma_attrs
*attrs
)
239 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
242 dma_ops
->unmap_sg(dev
, sg
, nhwentries
, direction
, attrs
);
245 static inline void *dma_alloc_coherent(struct device
*dev
, size_t size
,
246 dma_addr_t
*dma_handle
, gfp_t flag
)
248 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
251 return dma_ops
->alloc_coherent(dev
, size
, dma_handle
, flag
);
254 static inline void dma_free_coherent(struct device
*dev
, size_t size
,
255 void *cpu_addr
, dma_addr_t dma_handle
)
257 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
260 dma_ops
->free_coherent(dev
, size
, cpu_addr
, dma_handle
);
263 static inline dma_addr_t
dma_map_single(struct device
*dev
, void *cpu_addr
,
265 enum dma_data_direction direction
)
267 return dma_map_single_attrs(dev
, cpu_addr
, size
, direction
, NULL
);
270 static inline void dma_unmap_single(struct device
*dev
, dma_addr_t dma_addr
,
272 enum dma_data_direction direction
)
274 dma_unmap_single_attrs(dev
, dma_addr
, size
, direction
, NULL
);
277 static inline dma_addr_t
dma_map_page(struct device
*dev
, struct page
*page
,
278 unsigned long offset
, size_t size
,
279 enum dma_data_direction direction
)
281 return dma_map_page_attrs(dev
, page
, offset
, size
, direction
, NULL
);
284 static inline void dma_unmap_page(struct device
*dev
, dma_addr_t dma_address
,
286 enum dma_data_direction direction
)
288 dma_unmap_page_attrs(dev
, dma_address
, size
, direction
, NULL
);
291 static inline int dma_map_sg(struct device
*dev
, struct scatterlist
*sg
,
292 int nents
, enum dma_data_direction direction
)
294 return dma_map_sg_attrs(dev
, sg
, nents
, direction
, NULL
);
297 static inline void dma_unmap_sg(struct device
*dev
, struct scatterlist
*sg
,
299 enum dma_data_direction direction
)
301 dma_unmap_sg_attrs(dev
, sg
, nhwentries
, direction
, NULL
);
304 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
305 static inline void dma_sync_single_for_cpu(struct device
*dev
,
306 dma_addr_t dma_handle
, size_t size
,
307 enum dma_data_direction direction
)
309 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
313 if (dma_ops
->sync_single_range_for_cpu
)
314 dma_ops
->sync_single_range_for_cpu(dev
, dma_handle
, 0,
318 static inline void dma_sync_single_for_device(struct device
*dev
,
319 dma_addr_t dma_handle
, size_t size
,
320 enum dma_data_direction direction
)
322 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
326 if (dma_ops
->sync_single_range_for_device
)
327 dma_ops
->sync_single_range_for_device(dev
, dma_handle
,
331 static inline void dma_sync_sg_for_cpu(struct device
*dev
,
332 struct scatterlist
*sgl
, int nents
,
333 enum dma_data_direction direction
)
335 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
339 if (dma_ops
->sync_sg_for_cpu
)
340 dma_ops
->sync_sg_for_cpu(dev
, sgl
, nents
, direction
);
343 static inline void dma_sync_sg_for_device(struct device
*dev
,
344 struct scatterlist
*sgl
, int nents
,
345 enum dma_data_direction direction
)
347 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
351 if (dma_ops
->sync_sg_for_device
)
352 dma_ops
->sync_sg_for_device(dev
, sgl
, nents
, direction
);
355 static inline void dma_sync_single_range_for_cpu(struct device
*dev
,
356 dma_addr_t dma_handle
, unsigned long offset
, size_t size
,
357 enum dma_data_direction direction
)
359 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
363 if (dma_ops
->sync_single_range_for_cpu
)
364 dma_ops
->sync_single_range_for_cpu(dev
, dma_handle
,
365 offset
, size
, direction
);
368 static inline void dma_sync_single_range_for_device(struct device
*dev
,
369 dma_addr_t dma_handle
, unsigned long offset
, size_t size
,
370 enum dma_data_direction direction
)
372 struct dma_mapping_ops
*dma_ops
= get_dma_ops(dev
);
376 if (dma_ops
->sync_single_range_for_device
)
377 dma_ops
->sync_single_range_for_device(dev
, dma_handle
, offset
,
380 #else /* CONFIG_PPC_NEED_DMA_SYNC_OPS */
381 static inline void dma_sync_single_for_cpu(struct device
*dev
,
382 dma_addr_t dma_handle
, size_t size
,
383 enum dma_data_direction direction
)
387 static inline void dma_sync_single_for_device(struct device
*dev
,
388 dma_addr_t dma_handle
, size_t size
,
389 enum dma_data_direction direction
)
393 static inline void dma_sync_sg_for_cpu(struct device
*dev
,
394 struct scatterlist
*sgl
, int nents
,
395 enum dma_data_direction direction
)
399 static inline void dma_sync_sg_for_device(struct device
*dev
,
400 struct scatterlist
*sgl
, int nents
,
401 enum dma_data_direction direction
)
405 static inline void dma_sync_single_range_for_cpu(struct device
*dev
,
406 dma_addr_t dma_handle
, unsigned long offset
, size_t size
,
407 enum dma_data_direction direction
)
411 static inline void dma_sync_single_range_for_device(struct device
*dev
,
412 dma_addr_t dma_handle
, unsigned long offset
, size_t size
,
413 enum dma_data_direction direction
)
418 static inline int dma_mapping_error(struct device
*dev
, 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_cache_sync(struct device
*dev
, void *vaddr
, size_t size
,
451 enum dma_data_direction direction
)
453 BUG_ON(direction
== DMA_NONE
);
454 __dma_sync(vaddr
, size
, (int)direction
);
457 #endif /* __KERNEL__ */
458 #endif /* _ASM_DMA_MAPPING_H */