dma-mapping.h 20.6 KB
Newer Older
1 2
#ifndef _LINUX_DMA_MAPPING_H
#define _LINUX_DMA_MAPPING_H
Linus Torvalds's avatar
Linus Torvalds committed
3

4
#include <linux/sizes.h>
5
#include <linux/string.h>
Linus Torvalds's avatar
Linus Torvalds committed
6 7
#include <linux/device.h>
#include <linux/err.h>
8
#include <linux/dma-attrs.h>
9
#include <linux/dma-debug.h>
10
#include <linux/dma-direction.h>
11
#include <linux/scatterlist.h>
12 13
#include <linux/kmemcheck.h>
#include <linux/bug.h>
Linus Torvalds's avatar
Linus Torvalds committed
14

15 16 17 18 19 20
/*
 * A dma_addr_t can hold any valid DMA or bus address for the platform.
 * It can be given to a device to use as a DMA source or target.  A CPU cannot
 * reference a dma_addr_t directly because there may be translation between
 * its physical address space and the bus address space.
 */
21
struct dma_map_ops {
22 23 24 25 26 27
	void* (*alloc)(struct device *dev, size_t size,
				dma_addr_t *dma_handle, gfp_t gfp,
				struct dma_attrs *attrs);
	void (*free)(struct device *dev, size_t size,
			      void *vaddr, dma_addr_t dma_handle,
			      struct dma_attrs *attrs);
28 29 30
	int (*mmap)(struct device *, struct vm_area_struct *,
			  void *, dma_addr_t, size_t, struct dma_attrs *attrs);

31 32 33
	int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
			   dma_addr_t, size_t, struct dma_attrs *attrs);

34 35 36 37 38 39 40
	dma_addr_t (*map_page)(struct device *dev, struct page *page,
			       unsigned long offset, size_t size,
			       enum dma_data_direction dir,
			       struct dma_attrs *attrs);
	void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
			   size_t size, enum dma_data_direction dir,
			   struct dma_attrs *attrs);
41 42 43 44
	/*
	 * map_sg returns 0 on error and a value > 0 on success.
	 * It should never return a value < 0.
	 */
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65
	int (*map_sg)(struct device *dev, struct scatterlist *sg,
		      int nents, enum dma_data_direction dir,
		      struct dma_attrs *attrs);
	void (*unmap_sg)(struct device *dev,
			 struct scatterlist *sg, int nents,
			 enum dma_data_direction dir,
			 struct dma_attrs *attrs);
	void (*sync_single_for_cpu)(struct device *dev,
				    dma_addr_t dma_handle, size_t size,
				    enum dma_data_direction dir);
	void (*sync_single_for_device)(struct device *dev,
				       dma_addr_t dma_handle, size_t size,
				       enum dma_data_direction dir);
	void (*sync_sg_for_cpu)(struct device *dev,
				struct scatterlist *sg, int nents,
				enum dma_data_direction dir);
	void (*sync_sg_for_device)(struct device *dev,
				   struct scatterlist *sg, int nents,
				   enum dma_data_direction dir);
	int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
	int (*dma_supported)(struct device *dev, u64 mask);
66
	int (*set_dma_mask)(struct device *dev, u64 mask);
67 68 69
#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
	u64 (*get_required_mask)(struct device *dev);
#endif
70 71 72
	int is_phys;
};

73 74
extern struct dma_map_ops dma_noop_ops;

75
#define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
76

77 78
#define DMA_MASK_NONE	0x0ULL

79 80 81 82 83 84 85
static inline int valid_dma_direction(int dma_direction)
{
	return ((dma_direction == DMA_BIDIRECTIONAL) ||
		(dma_direction == DMA_TO_DEVICE) ||
		(dma_direction == DMA_FROM_DEVICE));
}

86 87 88 89 90
static inline int is_device_dma_capable(struct device *dev)
{
	return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
}

91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
/*
 * These three functions are only for dma allocator.
 * Don't use them in device drivers.
 */
int dma_alloc_from_coherent(struct device *dev, ssize_t size,
				       dma_addr_t *dma_handle, void **ret);
int dma_release_from_coherent(struct device *dev, int order, void *vaddr);

int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
			    void *cpu_addr, size_t size, int *ret);
#else
#define dma_alloc_from_coherent(dev, size, handle, ret) (0)
#define dma_release_from_coherent(dev, order, vaddr) (0)
#define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */

108
#ifdef CONFIG_HAS_DMA
Linus Torvalds's avatar
Linus Torvalds committed
109
#include <asm/dma-mapping.h>
110
#else
111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133
/*
 * Define the dma api to allow compilation but not linking of
 * dma dependent code.  Code that depends on the dma-mapping
 * API needs to set 'depends on HAS_DMA' in its Kconfig
 */
extern struct dma_map_ops bad_dma_ops;
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
	return &bad_dma_ops;
}
#endif

static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
					      size_t size,
					      enum dma_data_direction dir,
					      struct dma_attrs *attrs)
{
	struct dma_map_ops *ops = get_dma_ops(dev);
	dma_addr_t addr;

	kmemcheck_mark_initialized(ptr, size);
	BUG_ON(!valid_dma_direction(dir));
	addr = ops->map_page(dev, virt_to_page(ptr),
134
			     offset_in_page(ptr), size,
135 136
			     dir, attrs);
	debug_dma_map_page(dev, virt_to_page(ptr),
137
			   offset_in_page(ptr), size,
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390
			   dir, addr, true);
	return addr;
}

static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
					  size_t size,
					  enum dma_data_direction dir,
					  struct dma_attrs *attrs)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->unmap_page)
		ops->unmap_page(dev, addr, size, dir, attrs);
	debug_dma_unmap_page(dev, addr, size, dir, true);
}

/*
 * dma_maps_sg_attrs returns 0 on error and > 0 on success.
 * It should never return a value < 0.
 */
static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
				   int nents, enum dma_data_direction dir,
				   struct dma_attrs *attrs)
{
	struct dma_map_ops *ops = get_dma_ops(dev);
	int i, ents;
	struct scatterlist *s;

	for_each_sg(sg, s, nents, i)
		kmemcheck_mark_initialized(sg_virt(s), s->length);
	BUG_ON(!valid_dma_direction(dir));
	ents = ops->map_sg(dev, sg, nents, dir, attrs);
	BUG_ON(ents < 0);
	debug_dma_map_sg(dev, sg, nents, ents, dir);

	return ents;
}

static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
				      int nents, enum dma_data_direction dir,
				      struct dma_attrs *attrs)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	debug_dma_unmap_sg(dev, sg, nents, dir);
	if (ops->unmap_sg)
		ops->unmap_sg(dev, sg, nents, dir, attrs);
}

static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
				      size_t offset, size_t size,
				      enum dma_data_direction dir)
{
	struct dma_map_ops *ops = get_dma_ops(dev);
	dma_addr_t addr;

	kmemcheck_mark_initialized(page_address(page) + offset, size);
	BUG_ON(!valid_dma_direction(dir));
	addr = ops->map_page(dev, page, offset, size, dir, NULL);
	debug_dma_map_page(dev, page, offset, size, dir, addr, false);

	return addr;
}

static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
				  size_t size, enum dma_data_direction dir)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->unmap_page)
		ops->unmap_page(dev, addr, size, dir, NULL);
	debug_dma_unmap_page(dev, addr, size, dir, false);
}

static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
					   size_t size,
					   enum dma_data_direction dir)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->sync_single_for_cpu)
		ops->sync_single_for_cpu(dev, addr, size, dir);
	debug_dma_sync_single_for_cpu(dev, addr, size, dir);
}

static inline void dma_sync_single_for_device(struct device *dev,
					      dma_addr_t addr, size_t size,
					      enum dma_data_direction dir)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->sync_single_for_device)
		ops->sync_single_for_device(dev, addr, size, dir);
	debug_dma_sync_single_for_device(dev, addr, size, dir);
}

static inline void dma_sync_single_range_for_cpu(struct device *dev,
						 dma_addr_t addr,
						 unsigned long offset,
						 size_t size,
						 enum dma_data_direction dir)
{
	const struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->sync_single_for_cpu)
		ops->sync_single_for_cpu(dev, addr + offset, size, dir);
	debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
}

static inline void dma_sync_single_range_for_device(struct device *dev,
						    dma_addr_t addr,
						    unsigned long offset,
						    size_t size,
						    enum dma_data_direction dir)
{
	const struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->sync_single_for_device)
		ops->sync_single_for_device(dev, addr + offset, size, dir);
	debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
}

static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
		    int nelems, enum dma_data_direction dir)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->sync_sg_for_cpu)
		ops->sync_sg_for_cpu(dev, sg, nelems, dir);
	debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
}

static inline void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
		       int nelems, enum dma_data_direction dir)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->sync_sg_for_device)
		ops->sync_sg_for_device(dev, sg, nelems, dir);
	debug_dma_sync_sg_for_device(dev, sg, nelems, dir);

}

#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL)
#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL)
#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL)
#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL)

extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
			   void *cpu_addr, dma_addr_t dma_addr, size_t size);

void *dma_common_contiguous_remap(struct page *page, size_t size,
			unsigned long vm_flags,
			pgprot_t prot, const void *caller);

void *dma_common_pages_remap(struct page **pages, size_t size,
			unsigned long vm_flags, pgprot_t prot,
			const void *caller);
void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);

/**
 * dma_mmap_attrs - map a coherent DMA allocation into user space
 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 * @vma: vm_area_struct describing requested user mapping
 * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 * @handle: device-view address returned from dma_alloc_attrs
 * @size: size of memory originally requested in dma_alloc_attrs
 * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 *
 * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 * into user space.  The coherent DMA buffer must not be freed by the
 * driver until the user space mapping has been released.
 */
static inline int
dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
	       dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
{
	struct dma_map_ops *ops = get_dma_ops(dev);
	BUG_ON(!ops);
	if (ops->mmap)
		return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
	return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}

#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL)

int
dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
		       void *cpu_addr, dma_addr_t dma_addr, size_t size);

static inline int
dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
		      dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
{
	struct dma_map_ops *ops = get_dma_ops(dev);
	BUG_ON(!ops);
	if (ops->get_sgtable)
		return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
					attrs);
	return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
}

#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, NULL)

#ifndef arch_dma_alloc_attrs
#define arch_dma_alloc_attrs(dev, flag)	(true)
#endif

static inline void *dma_alloc_attrs(struct device *dev, size_t size,
				       dma_addr_t *dma_handle, gfp_t flag,
				       struct dma_attrs *attrs)
{
	struct dma_map_ops *ops = get_dma_ops(dev);
	void *cpu_addr;

	BUG_ON(!ops);

	if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr))
		return cpu_addr;

	if (!arch_dma_alloc_attrs(&dev, &flag))
		return NULL;
	if (!ops->alloc)
		return NULL;

	cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
	debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
	return cpu_addr;
}

static inline void dma_free_attrs(struct device *dev, size_t size,
				     void *cpu_addr, dma_addr_t dma_handle,
				     struct dma_attrs *attrs)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!ops);
	WARN_ON(irqs_disabled());

	if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
		return;

391
	if (!ops->free || !cpu_addr)
392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467
		return;

	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
	ops->free(dev, size, cpu_addr, dma_handle, attrs);
}

static inline void *dma_alloc_coherent(struct device *dev, size_t size,
		dma_addr_t *dma_handle, gfp_t flag)
{
	return dma_alloc_attrs(dev, size, dma_handle, flag, NULL);
}

static inline void dma_free_coherent(struct device *dev, size_t size,
		void *cpu_addr, dma_addr_t dma_handle)
{
	return dma_free_attrs(dev, size, cpu_addr, dma_handle, NULL);
}

static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
		dma_addr_t *dma_handle, gfp_t gfp)
{
	DEFINE_DMA_ATTRS(attrs);

	dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
	return dma_alloc_attrs(dev, size, dma_handle, gfp, &attrs);
}

static inline void dma_free_noncoherent(struct device *dev, size_t size,
		void *cpu_addr, dma_addr_t dma_handle)
{
	DEFINE_DMA_ATTRS(attrs);

	dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
	dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
}

static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
	debug_dma_mapping_error(dev, dma_addr);

	if (get_dma_ops(dev)->mapping_error)
		return get_dma_ops(dev)->mapping_error(dev, dma_addr);

#ifdef DMA_ERROR_CODE
	return dma_addr == DMA_ERROR_CODE;
#else
	return 0;
#endif
}

#ifndef HAVE_ARCH_DMA_SUPPORTED
static inline int dma_supported(struct device *dev, u64 mask)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	if (!ops)
		return 0;
	if (!ops->dma_supported)
		return 1;
	return ops->dma_supported(dev, mask);
}
#endif

#ifndef HAVE_ARCH_DMA_SET_MASK
static inline int dma_set_mask(struct device *dev, u64 mask)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	if (ops->set_dma_mask)
		return ops->set_dma_mask(dev, mask);

	if (!dev->dma_mask || !dma_supported(dev, mask))
		return -EIO;
	*dev->dma_mask = mask;
	return 0;
}
468
#endif
Linus Torvalds's avatar
Linus Torvalds committed
469

470 471
static inline u64 dma_get_mask(struct device *dev)
{
472
	if (dev && dev->dma_mask && *dev->dma_mask)
473
		return *dev->dma_mask;
474
	return DMA_BIT_MASK(32);
475 476
}

477
#ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
478 479
int dma_set_coherent_mask(struct device *dev, u64 mask);
#else
480 481 482 483 484 485 486
static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
{
	if (!dma_supported(dev, mask))
		return -EIO;
	dev->coherent_dma_mask = mask;
	return 0;
}
487
#endif
488

489 490 491 492 493 494 495 496 497 498 499 500 501 502
/*
 * Set both the DMA mask and the coherent DMA mask to the same thing.
 * Note that we don't check the return value from dma_set_coherent_mask()
 * as the DMA API guarantees that the coherent DMA mask can be set to
 * the same or smaller than the streaming DMA mask.
 */
static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
{
	int rc = dma_set_mask(dev, mask);
	if (rc == 0)
		dma_set_coherent_mask(dev, mask);
	return rc;
}

503 504 505 506 507 508 509 510 511 512
/*
 * Similar to the above, except it deals with the case where the device
 * does not have dev->dma_mask appropriately setup.
 */
static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
{
	dev->dma_mask = &dev->coherent_dma_mask;
	return dma_set_mask_and_coherent(dev, mask);
}

Linus Torvalds's avatar
Linus Torvalds committed
513 514
extern u64 dma_get_required_mask(struct device *dev);

515
#ifndef arch_setup_dma_ops
516 517 518 519 520 521 522
static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
				      u64 size, struct iommu_ops *iommu,
				      bool coherent) { }
#endif

#ifndef arch_teardown_dma_ops
static inline void arch_teardown_dma_ops(struct device *dev) { }
523 524
#endif

525 526
static inline unsigned int dma_get_max_seg_size(struct device *dev)
{
527 528 529
	if (dev->dma_parms && dev->dma_parms->max_segment_size)
		return dev->dma_parms->max_segment_size;
	return SZ_64K;
530 531 532 533 534 535 536 537
}

static inline unsigned int dma_set_max_seg_size(struct device *dev,
						unsigned int size)
{
	if (dev->dma_parms) {
		dev->dma_parms->max_segment_size = size;
		return 0;
538 539
	}
	return -EIO;
540 541
}

542 543
static inline unsigned long dma_get_seg_boundary(struct device *dev)
{
544 545 546
	if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
		return dev->dma_parms->segment_boundary_mask;
	return DMA_BIT_MASK(32);
547 548 549 550 551 552 553
}

static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
{
	if (dev->dma_parms) {
		dev->dma_parms->segment_boundary_mask = mask;
		return 0;
554 555
	}
	return -EIO;
556 557
}

558 559 560 561 562 563 564
#ifndef dma_max_pfn
static inline unsigned long dma_max_pfn(struct device *dev)
{
	return *dev->dma_mask >> PAGE_SHIFT;
}
#endif

565 566 567
static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
					dma_addr_t *dma_handle, gfp_t flag)
{
568 569
	void *ret = dma_alloc_coherent(dev, size, dma_handle,
				       flag | __GFP_ZERO);
570 571 572
	return ret;
}

573
#ifdef CONFIG_HAS_DMA
574 575 576 577 578 579 580
static inline int dma_get_cache_alignment(void)
{
#ifdef ARCH_DMA_MINALIGN
	return ARCH_DMA_MINALIGN;
#endif
	return 1;
}
581
#endif
582

Linus Torvalds's avatar
Linus Torvalds committed
583 584 585 586 587 588
/* flags for the coherent memory api */
#define	DMA_MEMORY_MAP			0x01
#define DMA_MEMORY_IO			0x02
#define DMA_MEMORY_INCLUDES_CHILDREN	0x04
#define DMA_MEMORY_EXCLUSIVE		0x08

589 590 591 592 593 594 595
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
				dma_addr_t device_addr, size_t size, int flags);
void dma_release_declared_memory(struct device *dev);
void *dma_mark_declared_memory_occupied(struct device *dev,
					dma_addr_t device_addr, size_t size);
#else
Linus Torvalds's avatar
Linus Torvalds committed
596
static inline int
597
dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
Linus Torvalds's avatar
Linus Torvalds committed
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613
			    dma_addr_t device_addr, size_t size, int flags)
{
	return 0;
}

static inline void
dma_release_declared_memory(struct device *dev)
{
}

static inline void *
dma_mark_declared_memory_occupied(struct device *dev,
				  dma_addr_t device_addr, size_t size)
{
	return ERR_PTR(-EBUSY);
}
614
#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
Linus Torvalds's avatar
Linus Torvalds committed
615

616 617 618 619 620 621 622 623 624 625 626
/*
 * Managed DMA API
 */
extern void *dmam_alloc_coherent(struct device *dev, size_t size,
				 dma_addr_t *dma_handle, gfp_t gfp);
extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
			       dma_addr_t dma_handle);
extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
				    dma_addr_t *dma_handle, gfp_t gfp);
extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
				  dma_addr_t dma_handle);
627
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
628 629
extern int dmam_declare_coherent_memory(struct device *dev,
					phys_addr_t phys_addr,
630 631 632
					dma_addr_t device_addr, size_t size,
					int flags);
extern void dmam_release_declared_memory(struct device *dev);
633
#else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
634
static inline int dmam_declare_coherent_memory(struct device *dev,
635
				phys_addr_t phys_addr, dma_addr_t device_addr,
636 637 638 639
				size_t size, gfp_t gfp)
{
	return 0;
}
Linus Torvalds's avatar
Linus Torvalds committed
640

641 642 643
static inline void dmam_release_declared_memory(struct device *dev)
{
}
644
#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
Linus Torvalds's avatar
Linus Torvalds committed
645

646 647
static inline void *dma_alloc_wc(struct device *dev, size_t size,
				 dma_addr_t *dma_addr, gfp_t gfp)
648 649 650 651 652
{
	DEFINE_DMA_ATTRS(attrs);
	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
	return dma_alloc_attrs(dev, size, dma_addr, gfp, &attrs);
}
653 654 655
#ifndef dma_alloc_writecombine
#define dma_alloc_writecombine dma_alloc_wc
#endif
656

657 658
static inline void dma_free_wc(struct device *dev, size_t size,
			       void *cpu_addr, dma_addr_t dma_addr)
659 660 661 662 663
{
	DEFINE_DMA_ATTRS(attrs);
	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
	return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs);
}
664 665 666
#ifndef dma_free_writecombine
#define dma_free_writecombine dma_free_wc
#endif
667

668 669 670 671
static inline int dma_mmap_wc(struct device *dev,
			      struct vm_area_struct *vma,
			      void *cpu_addr, dma_addr_t dma_addr,
			      size_t size)
672 673 674 675 676
{
	DEFINE_DMA_ATTRS(attrs);
	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
	return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
}
677 678 679
#ifndef dma_mmap_writecombine
#define dma_mmap_writecombine dma_mmap_wc
#endif
680

681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
#ifdef CONFIG_NEED_DMA_MAP_STATE
#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
#define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
#define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
#define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
#else
#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
#define dma_unmap_addr(PTR, ADDR_NAME)           (0)
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
#define dma_unmap_len(PTR, LEN_NAME)             (0)
#define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
#endif

697
#endif