[linux-2.6-block.git] / arch / mips / mm / dma-default.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2000  Ani Joshi <ajoshi@unixbox.com>
 * Copyright (C) 2000, 2001, 06  Ralf Baechle <ralf@linux-mips.org>
 * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
 */

#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/string.h>

#include <asm/cache.h>
#include <asm/io.h>

#include <dma-coherence.h>

static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
{
	unsigned long addr = plat_dma_addr_to_phys(dma_addr);

	return (unsigned long)phys_to_virt(addr);
}

/*
 * Warning on the terminology - Linux calls an uncached area coherent;
 * MIPS terminology calls memory areas with hardware maintained coherency
 * coherent.
 */

static inline int cpu_is_noncoherent_r10000(struct device *dev)
{
	return !plat_device_is_coherent(dev) &&
	       (current_cpu_type() == CPU_R10000 ||
	       current_cpu_type() == CPU_R12000);
}

static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
{
	/* ignore region specifiers */
	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);

#ifdef CONFIG_ZONE_DMA
	if (dev == NULL)
		gfp |= __GFP_DMA;
	else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
		gfp |= __GFP_DMA;
	else
#endif
#ifdef CONFIG_ZONE_DMA32
	     if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
		gfp |= __GFP_DMA32;
	else
#endif
		;

	/* Don't invoke OOM killer */
	gfp |= __GFP_NORETRY;

	return gfp;
}

void *dma_alloc_noncoherent(struct device *dev, size_t size,
	dma_addr_t * dma_handle, gfp_t gfp)
{
	void *ret;

	gfp = massage_gfp_flags(dev, gfp);

	ret = (void *) __get_free_pages(gfp, get_order(size));

	if (ret != NULL) {
		memset(ret, 0, size);
		*dma_handle = plat_map_dma_mem(dev, ret, size);
	}

	return ret;
}

EXPORT_SYMBOL(dma_alloc_noncoherent);

void *dma_alloc_coherent(struct device *dev, size_t size,
	dma_addr_t * dma_handle, gfp_t gfp)
{
	void *ret;

	gfp = massage_gfp_flags(dev, gfp);

	ret = (void *) __get_free_pages(gfp, get_order(size));

	if (ret) {
		memset(ret, 0, size);
		*dma_handle = plat_map_dma_mem(dev, ret, size);

		if (!plat_device_is_coherent(dev)) {
			dma_cache_wback_inv((unsigned long) ret, size);
			ret = UNCAC_ADDR(ret);
		}
	}

	return ret;
}

EXPORT_SYMBOL(dma_alloc_coherent);

void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
	dma_addr_t dma_handle)
{
	plat_unmap_dma_mem(dma_handle);
	free_pages((unsigned long) vaddr, get_order(size));
}

EXPORT_SYMBOL(dma_free_noncoherent);

void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
	dma_addr_t dma_handle)
{
	unsigned long addr = (unsigned long) vaddr;

	plat_unmap_dma_mem(dma_handle);

	if (!plat_device_is_coherent(dev))
		addr = CAC_ADDR(addr);

	free_pages(addr, get_order(size));
}

EXPORT_SYMBOL(dma_free_coherent);

static inline void __dma_sync(unsigned long addr, size_t size,
	enum dma_data_direction direction)
{
	switch (direction) {
	case DMA_TO_DEVICE:
		dma_cache_wback(addr, size);
		break;

	case DMA_FROM_DEVICE:
		dma_cache_inv(addr, size);
		break;

	case DMA_BIDIRECTIONAL:
		dma_cache_wback_inv(addr, size);
		break;

	default:
		BUG();
	}
}

dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
	enum dma_data_direction direction)
{
	unsigned long addr = (unsigned long) ptr;

	if (!plat_device_is_coherent(dev))
		__dma_sync(addr, size, direction);

	return plat_map_dma_mem(dev, ptr, size);
}

EXPORT_SYMBOL(dma_map_single);

void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
	enum dma_data_direction direction)
{
	if (cpu_is_noncoherent_r10000(dev))
		__dma_sync(dma_addr_to_virt(dma_addr), size,
		           direction);

	plat_unmap_dma_mem(dma_addr);
}

EXPORT_SYMBOL(dma_unmap_single);

int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
	enum dma_data_direction direction)
{
	int i;

	BUG_ON(direction == DMA_NONE);

	for (i = 0; i < nents; i++, sg++) {
		unsigned long addr;

		addr = (unsigned long) sg_virt(sg);
		if (!plat_device_is_coherent(dev) && addr)
			__dma_sync(addr, sg->length, direction);
		sg->dma_address = plat_map_dma_mem(dev,
				                   (void *)addr, sg->length);
	}

	return nents;
}

EXPORT_SYMBOL(dma_map_sg);

dma_addr_t dma_map_page(struct device *dev, struct page *page,
	unsigned long offset, size_t size, enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev)) {
		unsigned long addr;

		addr = (unsigned long) page_address(page) + offset;
		dma_cache_wback_inv(addr, size);
	}

	return plat_map_dma_mem_page(dev, page) + offset;
}

EXPORT_SYMBOL(dma_map_page);

void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
	enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
		unsigned long addr;

		addr = plat_dma_addr_to_phys(dma_address);
		dma_cache_wback_inv(addr, size);
	}

	plat_unmap_dma_mem(dma_address);
}

EXPORT_SYMBOL(dma_unmap_page);

void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
	enum dma_data_direction direction)
{
	unsigned long addr;
	int i;

	BUG_ON(direction == DMA_NONE);

	for (i = 0; i < nhwentries; i++, sg++) {
		if (!plat_device_is_coherent(dev) &&
		    direction != DMA_TO_DEVICE) {
			addr = (unsigned long) sg_virt(sg);
			if (addr)
				__dma_sync(addr, sg->length, direction);
		}
		plat_unmap_dma_mem(sg->dma_address);
	}
}

EXPORT_SYMBOL(dma_unmap_sg);

void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
	size_t size, enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);

	if (cpu_is_noncoherent_r10000(dev)) {
		unsigned long addr;

		addr = dma_addr_to_virt(dma_handle);
		__dma_sync(addr, size, direction);
	}
}

EXPORT_SYMBOL(dma_sync_single_for_cpu);

void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
	size_t size, enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev)) {
		unsigned long addr;

		addr = dma_addr_to_virt(dma_handle);
		__dma_sync(addr, size, direction);
	}
}

EXPORT_SYMBOL(dma_sync_single_for_device);

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)
{
	BUG_ON(direction == DMA_NONE);

	if (cpu_is_noncoherent_r10000(dev)) {
		unsigned long addr;

		addr = dma_addr_to_virt(dma_handle);
		__dma_sync(addr + offset, size, direction);
	}
}

EXPORT_SYMBOL(dma_sync_single_range_for_cpu);

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)
{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev)) {
		unsigned long addr;

		addr = dma_addr_to_virt(dma_handle);
		__dma_sync(addr + offset, size, direction);
	}
}

EXPORT_SYMBOL(dma_sync_single_range_for_device);

void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
	enum dma_data_direction direction)
{
	int i;

	BUG_ON(direction == DMA_NONE);

	/* Make sure that gcc doesn't leave the empty loop body.  */
	for (i = 0; i < nelems; i++, sg++) {
		if (cpu_is_noncoherent_r10000(dev))
			__dma_sync((unsigned long)page_address(sg_page(sg)),
			           sg->length, direction);
	}
}

EXPORT_SYMBOL(dma_sync_sg_for_cpu);

void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
	enum dma_data_direction direction)
{
	int i;

	BUG_ON(direction == DMA_NONE);

	/* Make sure that gcc doesn't leave the empty loop body.  */
	for (i = 0; i < nelems; i++, sg++) {
		if (!plat_device_is_coherent(dev))
			__dma_sync((unsigned long)page_address(sg_page(sg)),
			           sg->length, direction);
	}
}

EXPORT_SYMBOL(dma_sync_sg_for_device);

int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
	return 0;
}

EXPORT_SYMBOL(dma_mapping_error);

int dma_supported(struct device *dev, u64 mask)
{
	/*
	 * we fall back to GFP_DMA when the mask isn't all 1s,
	 * so we can't guarantee allocations that must be
	 * within a tighter range than GFP_DMA..
	 */
	if (mask < DMA_BIT_MASK(24))
		return 0;

	return 1;
}

EXPORT_SYMBOL(dma_supported);

int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
{
	return plat_device_is_coherent(dev);
}

EXPORT_SYMBOL(dma_is_consistent);

void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
	       enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev))
		__dma_sync((unsigned long)vaddr, size, direction);
}

EXPORT_SYMBOL(dma_cache_sync);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
9a88cbb5	7	* Copyright (C) 2000, 2001, 06 Ralf Baechle <ralf@linux-mips.org>
1da177e4 LT	8	* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
1da177e4 LT	9	*/
9a88cbb5	10
1da177e4	11	#include <linux/types.h>
9a88cbb5	12	#include <linux/dma-mapping.h>
1da177e4 LT	13	#include <linux/mm.h>
1da177e4 LT	14	#include <linux/module.h>
4fcc47a0	15	#include <linux/scatterlist.h>
6e86b0bf	16	#include <linux/string.h>
1da177e4 LT	17
	18	#include <asm/cache.h>
	19	#include <asm/io.h>
	20
9a88cbb5 RB	21	#include <dma-coherence.h>
9a88cbb5 RB	22
c9d06962 FBH	23	static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
	24	{
	25	unsigned long addr = plat_dma_addr_to_phys(dma_addr);
	26
	27	return (unsigned long)phys_to_virt(addr);
	28	}
	29
1da177e4 LT	30	/*
	31	* Warning on the terminology - Linux calls an uncached area coherent;
	32	* MIPS terminology calls memory areas with hardware maintained coherency
	33	* coherent.
	34	*/
	35
9a88cbb5 RB	36	static inline int cpu_is_noncoherent_r10000(struct device *dev)
	37	{
	38	return !plat_device_is_coherent(dev) &&
10cc3529 RB	39	(current_cpu_type() == CPU_R10000 \|\|
10cc3529 RB	40	current_cpu_type() == CPU_R12000);
9a88cbb5 RB	41	}
9a88cbb5 RB	42
cce335ae RB	43	static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
	44	{
	45	/* ignore region specifiers */
	46	gfp &= ~(__GFP_DMA \| __GFP_DMA32 \| __GFP_HIGHMEM);
	47
32016718	48	#ifdef CONFIG_ZONE_DMA
cce335ae RB	49	if (dev == NULL)
	50	gfp \|= __GFP_DMA;
	51	else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
	52	gfp \|= __GFP_DMA;
	53	else
	54	#endif
	55	#ifdef CONFIG_ZONE_DMA32
	56	if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
	57	gfp \|= __GFP_DMA32;
	58	else
	59	#endif
	60	;
	61
	62	/* Don't invoke OOM killer */
	63	gfp \|= __GFP_NORETRY;
	64
	65	return gfp;
	66	}
	67
1da177e4	68	void dma_alloc_noncoherent(struct device dev, size_t size,
185a8ff5	69	dma_addr_t * dma_handle, gfp_t gfp)
1da177e4 LT	70	{
1da177e4 LT	71	void *ret;
9a88cbb5	72
cce335ae	73	gfp = massage_gfp_flags(dev, gfp);
1da177e4	74
1da177e4 LT	75	ret = (void *) __get_free_pages(gfp, get_order(size));
	76
	77	if (ret != NULL) {
	78	memset(ret, 0, size);
9a88cbb5	79	*dma_handle = plat_map_dma_mem(dev, ret, size);
1da177e4 LT	80	}
	81
	82	return ret;
	83	}
	84
	85	EXPORT_SYMBOL(dma_alloc_noncoherent);
	86
	87	void dma_alloc_coherent(struct device dev, size_t size,
185a8ff5	88	dma_addr_t * dma_handle, gfp_t gfp)
1da177e4 LT	89	{
	90	void *ret;
	91
cce335ae	92	gfp = massage_gfp_flags(dev, gfp);
9a88cbb5	93
9a88cbb5 RB	94	ret = (void *) __get_free_pages(gfp, get_order(size));
9a88cbb5 RB	95
1da177e4	96	if (ret) {
9a88cbb5 RB	97	memset(ret, 0, size);
	98	*dma_handle = plat_map_dma_mem(dev, ret, size);
	99
	100	if (!plat_device_is_coherent(dev)) {
	101	dma_cache_wback_inv((unsigned long) ret, size);
	102	ret = UNCAC_ADDR(ret);
	103	}
1da177e4 LT	104	}
	105
	106	return ret;
	107	}
	108
	109	EXPORT_SYMBOL(dma_alloc_coherent);
	110
	111	void dma_free_noncoherent(struct device dev, size_t size, void vaddr,
	112	dma_addr_t dma_handle)
	113	{
11531ac2	114	plat_unmap_dma_mem(dma_handle);
1da177e4 LT	115	free_pages((unsigned long) vaddr, get_order(size));
	116	}
	117
	118	EXPORT_SYMBOL(dma_free_noncoherent);
	119
	120	void dma_free_coherent(struct device dev, size_t size, void vaddr,
	121	dma_addr_t dma_handle)
	122	{
	123	unsigned long addr = (unsigned long) vaddr;
	124
11531ac2 DD	125	plat_unmap_dma_mem(dma_handle);
11531ac2 DD	126
9a88cbb5 RB	127	if (!plat_device_is_coherent(dev))
	128	addr = CAC_ADDR(addr);
	129
1da177e4 LT	130	free_pages(addr, get_order(size));
	131	}
	132
	133	EXPORT_SYMBOL(dma_free_coherent);
	134
	135	static inline void __dma_sync(unsigned long addr, size_t size,
	136	enum dma_data_direction direction)
	137	{
	138	switch (direction) {
	139	case DMA_TO_DEVICE:
	140	dma_cache_wback(addr, size);
	141	break;
	142
	143	case DMA_FROM_DEVICE:
	144	dma_cache_inv(addr, size);
	145	break;
	146
	147	case DMA_BIDIRECTIONAL:
	148	dma_cache_wback_inv(addr, size);
	149	break;
	150
	151	default:
	152	BUG();
	153	}
	154	}
	155
	156	dma_addr_t dma_map_single(struct device dev, void ptr, size_t size,
	157	enum dma_data_direction direction)
	158	{
	159	unsigned long addr = (unsigned long) ptr;
	160
9a88cbb5 RB	161	if (!plat_device_is_coherent(dev))
9a88cbb5 RB	162	__dma_sync(addr, size, direction);
1da177e4	163
9a88cbb5	164	return plat_map_dma_mem(dev, ptr, size);
1da177e4 LT	165	}
	166
	167	EXPORT_SYMBOL(dma_map_single);
	168
	169	void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
	170	enum dma_data_direction direction)
	171	{
9a88cbb5	172	if (cpu_is_noncoherent_r10000(dev))
c9d06962	173	__dma_sync(dma_addr_to_virt(dma_addr), size,
9a88cbb5	174	direction);
1da177e4	175
9a88cbb5	176	plat_unmap_dma_mem(dma_addr);
1da177e4 LT	177	}
	178
	179	EXPORT_SYMBOL(dma_unmap_single);
	180
	181	int dma_map_sg(struct device dev, struct scatterlist sg, int nents,
	182	enum dma_data_direction direction)
	183	{
	184	int i;
	185
	186	BUG_ON(direction == DMA_NONE);
	187
	188	for (i = 0; i < nents; i++, sg++) {
	189	unsigned long addr;
42a3b4f2	190
58b053e4	191	addr = (unsigned long) sg_virt(sg);
9a88cbb5	192	if (!plat_device_is_coherent(dev) && addr)
58b053e4	193	__dma_sync(addr, sg->length, direction);
fbd5604d	194	sg->dma_address = plat_map_dma_mem(dev,
58b053e4	195	(void *)addr, sg->length);
1da177e4 LT	196	}
	197
	198	return nents;
	199	}
	200
	201	EXPORT_SYMBOL(dma_map_sg);
	202
	203	dma_addr_t dma_map_page(struct device dev, struct page page,
	204	unsigned long offset, size_t size, enum dma_data_direction direction)
	205	{
1da177e4 LT	206	BUG_ON(direction == DMA_NONE);
1da177e4 LT	207
9a88cbb5 RB	208	if (!plat_device_is_coherent(dev)) {
	209	unsigned long addr;
	210
	211	addr = (unsigned long) page_address(page) + offset;
	212	dma_cache_wback_inv(addr, size);
	213	}
1da177e4	214
9a88cbb5	215	return plat_map_dma_mem_page(dev, page) + offset;
1da177e4 LT	216	}
	217
	218	EXPORT_SYMBOL(dma_map_page);
	219
	220	void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
	221	enum dma_data_direction direction)
	222	{
	223	BUG_ON(direction == DMA_NONE);
	224
9a88cbb5	225	if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
1da177e4 LT	226	unsigned long addr;
1da177e4 LT	227
9a88cbb5	228	addr = plat_dma_addr_to_phys(dma_address);
1da177e4 LT	229	dma_cache_wback_inv(addr, size);
1da177e4 LT	230	}
9a88cbb5 RB	231
9a88cbb5 RB	232	plat_unmap_dma_mem(dma_address);
1da177e4 LT	233	}
	234
	235	EXPORT_SYMBOL(dma_unmap_page);
	236
	237	void dma_unmap_sg(struct device dev, struct scatterlist sg, int nhwentries,
	238	enum dma_data_direction direction)
	239	{
	240	unsigned long addr;
	241	int i;
	242
	243	BUG_ON(direction == DMA_NONE);
	244
1da177e4	245	for (i = 0; i < nhwentries; i++, sg++) {
9a88cbb5 RB	246	if (!plat_device_is_coherent(dev) &&
9a88cbb5 RB	247	direction != DMA_TO_DEVICE) {
58b053e4	248	addr = (unsigned long) sg_virt(sg);
9a88cbb5	249	if (addr)
58b053e4	250	__dma_sync(addr, sg->length, direction);
9a88cbb5 RB	251	}
9a88cbb5 RB	252	plat_unmap_dma_mem(sg->dma_address);
1da177e4 LT	253	}
	254	}
	255
	256	EXPORT_SYMBOL(dma_unmap_sg);
	257
	258	void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
	259	size_t size, enum dma_data_direction direction)
	260	{
1da177e4	261	BUG_ON(direction == DMA_NONE);
42a3b4f2	262
9a88cbb5 RB	263	if (cpu_is_noncoherent_r10000(dev)) {
	264	unsigned long addr;
	265
c9d06962	266	addr = dma_addr_to_virt(dma_handle);
9a88cbb5 RB	267	__dma_sync(addr, size, direction);
9a88cbb5 RB	268	}
1da177e4 LT	269	}
	270
	271	EXPORT_SYMBOL(dma_sync_single_for_cpu);
	272
	273	void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
	274	size_t size, enum dma_data_direction direction)
	275	{
1da177e4 LT	276	BUG_ON(direction == DMA_NONE);
1da177e4 LT	277
9b43fb6b	278	if (!plat_device_is_coherent(dev)) {
9a88cbb5 RB	279	unsigned long addr;
9a88cbb5 RB	280
c9d06962	281	addr = dma_addr_to_virt(dma_handle);
9a88cbb5 RB	282	__dma_sync(addr, size, direction);
9a88cbb5 RB	283	}
1da177e4 LT	284	}
	285
	286	EXPORT_SYMBOL(dma_sync_single_for_device);
	287
	288	void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
	289	unsigned long offset, size_t size, enum dma_data_direction direction)
	290	{
1da177e4 LT	291	BUG_ON(direction == DMA_NONE);
1da177e4 LT	292
9a88cbb5 RB	293	if (cpu_is_noncoherent_r10000(dev)) {
	294	unsigned long addr;
	295
c9d06962	296	addr = dma_addr_to_virt(dma_handle);
9a88cbb5 RB	297	__dma_sync(addr + offset, size, direction);
9a88cbb5 RB	298	}
1da177e4 LT	299	}
	300
	301	EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
	302
	303	void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
	304	unsigned long offset, size_t size, enum dma_data_direction direction)
	305	{
1da177e4 LT	306	BUG_ON(direction == DMA_NONE);
1da177e4 LT	307
9b43fb6b	308	if (!plat_device_is_coherent(dev)) {
9a88cbb5 RB	309	unsigned long addr;
9a88cbb5 RB	310
c9d06962	311	addr = dma_addr_to_virt(dma_handle);
9a88cbb5 RB	312	__dma_sync(addr + offset, size, direction);
9a88cbb5 RB	313	}
1da177e4 LT	314	}
	315
	316	EXPORT_SYMBOL(dma_sync_single_range_for_device);
	317
	318	void dma_sync_sg_for_cpu(struct device dev, struct scatterlist sg, int nelems,
	319	enum dma_data_direction direction)
	320	{
	321	int i;
42a3b4f2	322
1da177e4	323	BUG_ON(direction == DMA_NONE);
42a3b4f2	324
1da177e4	325	/* Make sure that gcc doesn't leave the empty loop body. */
9a88cbb5	326	for (i = 0; i < nelems; i++, sg++) {
5b648a98	327	if (cpu_is_noncoherent_r10000(dev))
58b053e4	328	__dma_sync((unsigned long)page_address(sg_page(sg)),
9a88cbb5	329	sg->length, direction);
9a88cbb5	330	}
1da177e4 LT	331	}
	332
	333	EXPORT_SYMBOL(dma_sync_sg_for_cpu);
	334
	335	void dma_sync_sg_for_device(struct device dev, struct scatterlist sg, int nelems,
	336	enum dma_data_direction direction)
	337	{
	338	int i;
	339
	340	BUG_ON(direction == DMA_NONE);
	341
	342	/* Make sure that gcc doesn't leave the empty loop body. */
9a88cbb5 RB	343	for (i = 0; i < nelems; i++, sg++) {
9a88cbb5 RB	344	if (!plat_device_is_coherent(dev))
58b053e4	345	__dma_sync((unsigned long)page_address(sg_page(sg)),
9a88cbb5	346	sg->length, direction);
9a88cbb5	347	}
1da177e4 LT	348	}
	349
	350	EXPORT_SYMBOL(dma_sync_sg_for_device);
	351
8d8bb39b	352	int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
1da177e4 LT	353	{
	354	return 0;
	355	}
	356
	357	EXPORT_SYMBOL(dma_mapping_error);
	358
	359	int dma_supported(struct device *dev, u64 mask)
	360	{
	361	/*
	362	* we fall back to GFP_DMA when the mask isn't all 1s,
	363	* so we can't guarantee allocations that must be
	364	* within a tighter range than GFP_DMA..
	365	*/
cce335ae	366	if (mask < DMA_BIT_MASK(24))
1da177e4 LT	367	return 0;
	368
	369	return 1;
	370	}
	371
	372	EXPORT_SYMBOL(dma_supported);
	373
f67637ee	374	int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
1da177e4	375	{
9a88cbb5	376	return plat_device_is_coherent(dev);
1da177e4 LT	377	}
	378
	379	EXPORT_SYMBOL(dma_is_consistent);
	380
d3fa72e4	381	void dma_cache_sync(struct device dev, void vaddr, size_t size,
9a88cbb5	382	enum dma_data_direction direction)
1da177e4	383	{
9a88cbb5	384	BUG_ON(direction == DMA_NONE);
1da177e4	385
9a88cbb5	386	if (!plat_device_is_coherent(dev))
c7c6b390	387	__dma_sync((unsigned long)vaddr, size, direction);
1da177e4 LT	388	}
	389
	390	EXPORT_SYMBOL(dma_cache_sync);