dma-mapping.h 13.5 KB
Newer Older
L
Linus Torvalds 已提交
1
/*
S
Stephen Rothwell 已提交
2 3 4 5
 * Copyright (C) 2004 IBM
 *
 * Implements the generic device dma API for powerpc.
 * the pci and vio busses
L
Linus Torvalds 已提交
6
 */
S
Stephen Rothwell 已提交
7 8
#ifndef _ASM_DMA_MAPPING_H
#define _ASM_DMA_MAPPING_H
9 10 11 12 13 14 15
#ifdef __KERNEL__

#include <linux/types.h>
#include <linux/cache.h>
/* need struct page definitions */
#include <linux/mm.h>
#include <linux/scatterlist.h>
16
#include <linux/dma-attrs.h>
17
#include <asm/io.h>
18
#include <asm/swiotlb.h>
19 20 21

#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)

22 23 24 25 26 27 28 29
/* Some dma direct funcs must be visible for use in other dma_ops */
extern void *dma_direct_alloc_coherent(struct device *dev, size_t size,
				       dma_addr_t *dma_handle, gfp_t flag);
extern void dma_direct_free_coherent(struct device *dev, size_t size,
				     void *vaddr, dma_addr_t dma_handle);

extern unsigned long get_dma_direct_offset(struct device *dev);

30 31 32 33 34 35 36 37
#ifdef CONFIG_NOT_COHERENT_CACHE
/*
 * DMA-consistent mapping functions for PowerPCs that don't support
 * cache snooping.  These allocate/free a region of uncached mapped
 * memory space for use with DMA devices.  Alternatively, you could
 * allocate the space "normally" and use the cache management functions
 * to ensure it is consistent.
 */
38 39 40
struct device;
extern void *__dma_alloc_coherent(struct device *dev, size_t size,
				  dma_addr_t *handle, gfp_t gfp);
41 42 43 44 45 46 47 48 49 50
extern void __dma_free_coherent(size_t size, void *vaddr);
extern void __dma_sync(void *vaddr, size_t size, int direction);
extern void __dma_sync_page(struct page *page, unsigned long offset,
				 size_t size, int direction);

#else /* ! CONFIG_NOT_COHERENT_CACHE */
/*
 * Cache coherent cores.
 */

51
#define __dma_alloc_coherent(dev, gfp, size, handle)	NULL
52 53 54 55 56 57
#define __dma_free_coherent(size, addr)		((void)0)
#define __dma_sync(addr, size, rw)		((void)0)
#define __dma_sync_page(pg, off, sz, rw)	((void)0)

#endif /* ! CONFIG_NOT_COHERENT_CACHE */

58 59 60 61 62 63 64 65
static inline unsigned long device_to_mask(struct device *dev)
{
	if (dev->dma_mask && *dev->dma_mask)
		return *dev->dma_mask;
	/* Assume devices without mask can take 32 bit addresses */
	return 0xfffffffful;
}

66 67 68 69 70 71 72 73 74
/*
 * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
 */
struct dma_mapping_ops {
	void *		(*alloc_coherent)(struct device *dev, size_t size,
				dma_addr_t *dma_handle, gfp_t flag);
	void		(*free_coherent)(struct device *dev, size_t size,
				void *vaddr, dma_addr_t dma_handle);
	int		(*map_sg)(struct device *dev, struct scatterlist *sg,
75 76
				int nents, enum dma_data_direction direction,
				struct dma_attrs *attrs);
77
	void		(*unmap_sg)(struct device *dev, struct scatterlist *sg,
78 79
				int nents, enum dma_data_direction direction,
				struct dma_attrs *attrs);
80 81
	int		(*dma_supported)(struct device *dev, u64 mask);
	int		(*set_dma_mask)(struct device *dev, u64 dma_mask);
82 83 84 85 86 87 88 89
	dma_addr_t 	(*map_page)(struct device *dev, struct page *page,
				unsigned long offset, size_t size,
				enum dma_data_direction direction,
				struct dma_attrs *attrs);
	void		(*unmap_page)(struct device *dev,
				dma_addr_t dma_address, size_t size,
				enum dma_data_direction direction,
				struct dma_attrs *attrs);
B
Becky Bruce 已提交
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105
#ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
	void            (*sync_single_range_for_cpu)(struct device *hwdev,
				dma_addr_t dma_handle, unsigned long offset,
				size_t size,
				enum dma_data_direction direction);
	void            (*sync_single_range_for_device)(struct device *hwdev,
				dma_addr_t dma_handle, unsigned long offset,
				size_t size,
				enum dma_data_direction direction);
	void            (*sync_sg_for_cpu)(struct device *hwdev,
				struct scatterlist *sg, int nelems,
				enum dma_data_direction direction);
	void            (*sync_sg_for_device)(struct device *hwdev,
				struct scatterlist *sg, int nelems,
				enum dma_data_direction direction);
#endif
106 107
};

108 109 110 111 112 113 114 115
/*
 * Available generic sets of operations
 */
#ifdef CONFIG_PPC64
extern struct dma_mapping_ops dma_iommu_ops;
#endif
extern struct dma_mapping_ops dma_direct_ops;

116 117 118 119 120 121 122
static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
{
	/* We don't handle the NULL dev case for ISA for now. We could
	 * do it via an out of line call but it is not needed for now. The
	 * only ISA DMA device we support is the floppy and we have a hack
	 * in the floppy driver directly to get a device for us.
	 */
123
	if (unlikely(dev == NULL))
124
		return NULL;
125

126
	return dev->archdata.dma_ops;
127 128 129 130 131
}

static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
{
	dev->archdata.dma_ops = ops;
132 133 134 135 136 137 138 139 140 141 142 143 144
}

static inline int dma_supported(struct device *dev, u64 mask)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	if (unlikely(dma_ops == NULL))
		return 0;
	if (dma_ops->dma_supported == NULL)
		return 1;
	return dma_ops->dma_supported(dev, mask);
}

145 146 147
/* We have our own implementation of pci_set_dma_mask() */
#define HAVE_ARCH_PCI_SET_DMA_MASK

148 149 150 151 152 153 154 155 156 157 158 159 160 161
static inline int dma_set_mask(struct device *dev, u64 dma_mask)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	if (unlikely(dma_ops == NULL))
		return -EIO;
	if (dma_ops->set_dma_mask != NULL)
		return dma_ops->set_dma_mask(dev, dma_mask);
	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
		return -EIO;
	*dev->dma_mask = dma_mask;
	return 0;
}

162
/*
163 164 165
 * map_/unmap_single actually call through to map/unmap_page now that all the
 * dma_mapping_ops have been converted over. We just have to get the page and
 * offset to pass through to map_page
166
 */
167 168 169 170 171 172 173 174 175
static inline dma_addr_t dma_map_single_attrs(struct device *dev,
					      void *cpu_addr,
					      size_t size,
					      enum dma_data_direction direction,
					      struct dma_attrs *attrs)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
176 177 178 179

	return dma_ops->map_page(dev, virt_to_page(cpu_addr),
				 (unsigned long)cpu_addr % PAGE_SIZE, size,
				 direction, attrs);
180 181 182 183 184 185 186 187 188 189 190
}

static inline void dma_unmap_single_attrs(struct device *dev,
					  dma_addr_t dma_addr,
					  size_t size,
					  enum dma_data_direction direction,
					  struct dma_attrs *attrs)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
191 192

	dma_ops->unmap_page(dev, dma_addr, size, direction, attrs);
193 194 195 196 197 198 199 200 201 202 203
}

static inline dma_addr_t dma_map_page_attrs(struct device *dev,
					    struct page *page,
					    unsigned long offset, size_t size,
					    enum dma_data_direction direction,
					    struct dma_attrs *attrs)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
204

205
	return dma_ops->map_page(dev, page, offset, size, direction, attrs);
206 207 208 209 210 211 212 213 214 215 216
}

static inline void dma_unmap_page_attrs(struct device *dev,
					dma_addr_t dma_address,
					size_t size,
					enum dma_data_direction direction,
					struct dma_attrs *attrs)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
217

218
	dma_ops->unmap_page(dev, dma_address, size, direction, attrs);
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
}

static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
				   int nents, enum dma_data_direction direction,
				   struct dma_attrs *attrs)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	return dma_ops->map_sg(dev, sg, nents, direction, attrs);
}

static inline void dma_unmap_sg_attrs(struct device *dev,
				      struct scatterlist *sg,
				      int nhwentries,
				      enum dma_data_direction direction,
				      struct dma_attrs *attrs)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
}

243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
static inline void *dma_alloc_coherent(struct device *dev, size_t size,
				       dma_addr_t *dma_handle, gfp_t flag)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
}

static inline void dma_free_coherent(struct device *dev, size_t size,
				     void *cpu_addr, dma_addr_t dma_handle)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
}

static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
					size_t size,
					enum dma_data_direction direction)
{
265
	return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
266 267 268 269 270 271
}

static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
				    size_t size,
				    enum dma_data_direction direction)
{
272
	dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
273 274 275 276 277 278
}

static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
				      unsigned long offset, size_t size,
				      enum dma_data_direction direction)
{
279
	return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
280
}
281 282 283 284 285

static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
				  size_t size,
				  enum dma_data_direction direction)
{
286
	dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
287 288 289 290 291
}

static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
			     int nents, enum dma_data_direction direction)
{
292
	return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
293 294 295 296 297 298
}

static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
				int nhwentries,
				enum dma_data_direction direction)
{
299
	dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
300
}
S
Stephen Rothwell 已提交
301

B
Becky Bruce 已提交
302
#ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
S
Stephen Rothwell 已提交
303 304 305
static inline void dma_sync_single_for_cpu(struct device *dev,
		dma_addr_t dma_handle, size_t size,
		enum dma_data_direction direction)
L
Linus Torvalds 已提交
306
{
B
Becky Bruce 已提交
307 308 309
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
310 311 312

	if (dma_ops->sync_single_range_for_cpu)
		dma_ops->sync_single_range_for_cpu(dev, dma_handle, 0,
B
Becky Bruce 已提交
313
					   size, direction);
L
Linus Torvalds 已提交
314 315
}

S
Stephen Rothwell 已提交
316 317 318
static inline void dma_sync_single_for_device(struct device *dev,
		dma_addr_t dma_handle, size_t size,
		enum dma_data_direction direction)
L
Linus Torvalds 已提交
319
{
B
Becky Bruce 已提交
320 321 322
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
323 324 325

	if (dma_ops->sync_single_range_for_device)
		dma_ops->sync_single_range_for_device(dev, dma_handle,
B
Becky Bruce 已提交
326
					      0, size, direction);
L
Linus Torvalds 已提交
327 328
}

S
Stephen Rothwell 已提交
329
static inline void dma_sync_sg_for_cpu(struct device *dev,
J
Jens Axboe 已提交
330
		struct scatterlist *sgl, int nents,
S
Stephen Rothwell 已提交
331
		enum dma_data_direction direction)
L
Linus Torvalds 已提交
332
{
B
Becky Bruce 已提交
333
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
L
Linus Torvalds 已提交
334

B
Becky Bruce 已提交
335
	BUG_ON(!dma_ops);
336 337 338

	if (dma_ops->sync_sg_for_cpu)
		dma_ops->sync_sg_for_cpu(dev, sgl, nents, direction);
L
Linus Torvalds 已提交
339 340
}

S
Stephen Rothwell 已提交
341
static inline void dma_sync_sg_for_device(struct device *dev,
J
Jens Axboe 已提交
342
		struct scatterlist *sgl, int nents,
S
Stephen Rothwell 已提交
343
		enum dma_data_direction direction)
L
Linus Torvalds 已提交
344
{
B
Becky Bruce 已提交
345
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
L
Linus Torvalds 已提交
346

B
Becky Bruce 已提交
347
	BUG_ON(!dma_ops);
348 349 350

	if (dma_ops->sync_sg_for_device)
		dma_ops->sync_sg_for_device(dev, sgl, nents, direction);
B
Becky Bruce 已提交
351 352 353 354 355 356 357
}

static inline void dma_sync_single_range_for_cpu(struct device *dev,
		dma_addr_t dma_handle, unsigned long offset, size_t size,
		enum dma_data_direction direction)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
L
Linus Torvalds 已提交
358

B
Becky Bruce 已提交
359
	BUG_ON(!dma_ops);
360 361 362

	if (dma_ops->sync_single_range_for_cpu)
		dma_ops->sync_single_range_for_cpu(dev, dma_handle,
B
Becky Bruce 已提交
363 364 365 366 367 368 369 370 371 372
					   offset, size, direction);
}

static inline void dma_sync_single_range_for_device(struct device *dev,
		dma_addr_t dma_handle, unsigned long offset, size_t size,
		enum dma_data_direction direction)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
373 374 375

	if (dma_ops->sync_single_range_for_device)
		dma_ops->sync_single_range_for_device(dev, dma_handle, offset,
B
Becky Bruce 已提交
376
					      size, direction);
L
Linus Torvalds 已提交
377
}
B
Becky Bruce 已提交
378
#else /* CONFIG_PPC_NEED_DMA_SYNC_OPS */
379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413
static inline void dma_sync_single_for_cpu(struct device *dev,
		dma_addr_t dma_handle, size_t size,
		enum dma_data_direction direction)
{
}

static inline void dma_sync_single_for_device(struct device *dev,
		dma_addr_t dma_handle, size_t size,
		enum dma_data_direction direction)
{
}

static inline void dma_sync_sg_for_cpu(struct device *dev,
		struct scatterlist *sgl, int nents,
		enum dma_data_direction direction)
{
}

static inline void dma_sync_sg_for_device(struct device *dev,
		struct scatterlist *sgl, int nents,
		enum dma_data_direction direction)
{
}

static inline void dma_sync_single_range_for_cpu(struct device *dev,
		dma_addr_t dma_handle, unsigned long offset, size_t size,
		enum dma_data_direction direction)
{
}

static inline void dma_sync_single_range_for_device(struct device *dev,
		dma_addr_t dma_handle, unsigned long offset, size_t size,
		enum dma_data_direction direction)
{
}
B
Becky Bruce 已提交
414
#endif
L
Linus Torvalds 已提交
415

416
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
S
Stephen Rothwell 已提交
417 418 419 420 421 422 423 424
{
#ifdef CONFIG_PPC64
	return (dma_addr == DMA_ERROR_CODE);
#else
	return 0;
#endif
}

425 426
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
427 428
#ifdef CONFIG_SWIOTLB
	struct dev_archdata *sd = &dev->archdata;
429

430
	if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
431
		return 0;
432
#endif
433 434 435 436 437 438 439

	if (!dev->dma_mask)
		return 0;

	return addr + size <= *dev->dma_mask;
}

440 441 442 443 444 445 446 447 448 449
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
	return paddr + get_dma_direct_offset(dev);
}

static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
{
	return daddr - get_dma_direct_offset(dev);
}

L
Linus Torvalds 已提交
450 451 452
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
#ifdef CONFIG_NOT_COHERENT_CACHE
453
#define dma_is_consistent(d, h)	(0)
L
Linus Torvalds 已提交
454
#else
455
#define dma_is_consistent(d, h)	(1)
L
Linus Torvalds 已提交
456 457 458 459
#endif

static inline int dma_get_cache_alignment(void)
{
S
Stephen Rothwell 已提交
460 461 462
#ifdef CONFIG_PPC64
	/* no easy way to get cache size on all processors, so return
	 * the maximum possible, to be safe */
463
	return (1 << INTERNODE_CACHE_SHIFT);
S
Stephen Rothwell 已提交
464
#else
L
Linus Torvalds 已提交
465 466 467 468 469
	/*
	 * Each processor family will define its own L1_CACHE_SHIFT,
	 * L1_CACHE_BYTES wraps to this, so this is always safe.
	 */
	return L1_CACHE_BYTES;
S
Stephen Rothwell 已提交
470
#endif
L
Linus Torvalds 已提交
471 472
}

473
static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
S
Stephen Rothwell 已提交
474
		enum dma_data_direction direction)
L
Linus Torvalds 已提交
475
{
S
Stephen Rothwell 已提交
476
	BUG_ON(direction == DMA_NONE);
L
Linus Torvalds 已提交
477 478 479
	__dma_sync(vaddr, size, (int)direction);
}

480
#endif /* __KERNEL__ */
S
Stephen Rothwell 已提交
481
#endif	/* _ASM_DMA_MAPPING_H */