[deliverable/linux.git] / include / asm-powerpc / dma-mapping.h

/*
 * Copyright (C) 2004 IBM
 *
 * Implements the generic device dma API for powerpc.
 * the pci and vio busses
 */
#ifndef _ASM_DMA_MAPPING_H
#define _ASM_DMA_MAPPING_H
#ifdef __KERNEL__

#include <linux/types.h>
#include <linux/cache.h>
/* need struct page definitions */
#include <linux/mm.h>
#include <asm/scatterlist.h>
#include <asm/io.h>

#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)

#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.
 */
extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
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.
 */

#define __dma_alloc_coherent(gfp, size, handle)	NULL
#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 */

#ifdef CONFIG_PPC64
/*
 * 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);
	dma_addr_t	(*map_single)(struct device *dev, void *ptr,
				size_t size, enum dma_data_direction direction);
	void		(*unmap_single)(struct device *dev, dma_addr_t dma_addr,
				size_t size, enum dma_data_direction direction);
	int		(*map_sg)(struct device *dev, struct scatterlist *sg,
				int nents, enum dma_data_direction direction);
	void		(*unmap_sg)(struct device *dev, struct scatterlist *sg,
				int nents, enum dma_data_direction direction);
	int		(*dma_supported)(struct device *dev, u64 mask);
	int		(*set_dma_mask)(struct device *dev, u64 dma_mask);
};

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.
	 */
	if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
		return NULL;
	return dev->archdata.dma_ops;
}

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);
}

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;
}

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)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	return dma_ops->map_single(dev, cpu_addr, size, direction);
}

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

	BUG_ON(!dma_ops);
	dma_ops->unmap_single(dev, dma_addr, size, direction);
}

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)
{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	return dma_ops->map_single(dev, page_address(page) + offset, size,
			direction);
}

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

	BUG_ON(!dma_ops);
	dma_ops->unmap_single(dev, dma_address, size, direction);
}

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

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

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

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


/*
 * Available generic sets of operations
 */
extern struct dma_mapping_ops dma_iommu_ops;
extern struct dma_mapping_ops dma_direct_ops;

extern unsigned long dma_direct_offset;

#else /* CONFIG_PPC64 */

#define dma_supported(dev, mask)	(1)

static inline int dma_set_mask(struct device *dev, u64 dma_mask)
{
	if (!dev->dma_mask || !dma_supported(dev, mask))
		return -EIO;

	*dev->dma_mask = dma_mask;

	return 0;
}

static inline void *dma_alloc_coherent(struct device *dev, size_t size,
				       dma_addr_t * dma_handle,
				       gfp_t gfp)
{
#ifdef CONFIG_NOT_COHERENT_CACHE
	return __dma_alloc_coherent(size, dma_handle, gfp);
#else
	void *ret;
	/* ignore region specifiers */
	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);

	if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
		gfp |= GFP_DMA;

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

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

	return ret;
#endif
}

static inline void
dma_free_coherent(struct device *dev, size_t size, void *vaddr,
		  dma_addr_t dma_handle)
{
#ifdef CONFIG_NOT_COHERENT_CACHE
	__dma_free_coherent(size, vaddr);
#else
	free_pages((unsigned long)vaddr, get_order(size));
#endif
}

static inline dma_addr_t
dma_map_single(struct device *dev, void *ptr, size_t size,
	       enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);

	__dma_sync(ptr, size, direction);

	return virt_to_bus(ptr);
}

static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
				    size_t size,
				    enum dma_data_direction direction)
{
	/* We do nothing. */
}

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)
{
	BUG_ON(direction == DMA_NONE);

	__dma_sync_page(page, offset, size, direction);

	return page_to_bus(page) + offset;
}

static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
				  size_t size,
				  enum dma_data_direction direction)
{
	/* We do nothing. */
}

static inline 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++) {
		BUG_ON(!sg->page);
		__dma_sync_page(sg->page, sg->offset, sg->length, direction);
		sg->dma_address = page_to_bus(sg->page) + sg->offset;
	}

	return nents;
}

static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
				int nhwentries,
				enum dma_data_direction direction)
{
	/* We don't do anything here. */
}

#endif /* CONFIG_PPC64 */

static inline 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);
	__dma_sync(bus_to_virt(dma_handle), size, 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)
{
	BUG_ON(direction == DMA_NONE);
	__dma_sync(bus_to_virt(dma_handle), size, direction);
}

static inline void dma_sync_sg_for_cpu(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++)
		__dma_sync_page(sg->page, sg->offset, sg->length, direction);
}

static inline void dma_sync_sg_for_device(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++)
		__dma_sync_page(sg->page, sg->offset, sg->length, direction);
}

static inline int dma_mapping_error(dma_addr_t dma_addr)
{
#ifdef CONFIG_PPC64
	return (dma_addr == DMA_ERROR_CODE);
#else
	return 0;
#endif
}

#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
#define dma_is_consistent(d, h)	(0)
#else
#define dma_is_consistent(d, h)	(1)
#endif

static inline int dma_get_cache_alignment(void)
{
#ifdef CONFIG_PPC64
	/* no easy way to get cache size on all processors, so return
	 * the maximum possible, to be safe */
	return (1 << INTERNODE_CACHE_SHIFT);
#else
	/*
	 * 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;
#endif
}

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)
{
	/* just sync everything for now */
	dma_sync_single_for_cpu(dev, dma_handle, 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)
{
	/* just sync everything for now */
	dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
}

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

#endif /* __KERNEL__ */
#endif	/* _ASM_DMA_MAPPING_H */
Commit	Line	Data
1da177e4	1	/*
78b09735 SR	2	* Copyright (C) 2004 IBM
	3	*
	4	* Implements the generic device dma API for powerpc.
	5	* the pci and vio busses
1da177e4	6	*/
78b09735 SR	7	#ifndef _ASM_DMA_MAPPING_H
78b09735 SR	8	#define _ASM_DMA_MAPPING_H
88ced031	9	#ifdef __KERNEL__
1da177e4	10
78b09735 SR	11	#include <linux/types.h>
78b09735 SR	12	#include <linux/cache.h>
1da177e4 LT	13	/* need struct page definitions */
	14	#include <linux/mm.h>
	15	#include <asm/scatterlist.h>
	16	#include <asm/io.h>
78b09735 SR	17
78b09735 SR	18	#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
1da177e4 LT	19
	20	#ifdef CONFIG_NOT_COHERENT_CACHE
	21	/*
	22	* DMA-consistent mapping functions for PowerPCs that don't support
	23	* cache snooping. These allocate/free a region of uncached mapped
	24	* memory space for use with DMA devices. Alternatively, you could
	25	* allocate the space "normally" and use the cache management functions
	26	* to ensure it is consistent.
	27	*/
e82dd4d6	28	extern void __dma_alloc_coherent(size_t size, dma_addr_t handle, gfp_t gfp);
1da177e4 LT	29	extern void __dma_free_coherent(size_t size, void *vaddr);
	30	extern void __dma_sync(void *vaddr, size_t size, int direction);
	31	extern void __dma_sync_page(struct page *page, unsigned long offset,
	32	size_t size, int direction);
1da177e4 LT	33
	34	#else /* ! CONFIG_NOT_COHERENT_CACHE */
	35	/*
	36	* Cache coherent cores.
	37	*/
	38
1da177e4	39	#define __dma_alloc_coherent(gfp, size, handle) NULL
6a13f660 AV	40	#define __dma_free_coherent(size, addr) ((void)0)
	41	#define __dma_sync(addr, size, rw) ((void)0)
	42	#define __dma_sync_page(pg, off, sz, rw) ((void)0)
1da177e4 LT	43
	44	#endif /* ! CONFIG_NOT_COHERENT_CACHE */
	45
78b09735	46	#ifdef CONFIG_PPC64
12d04eef BH	47	/*
	48	* DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
	49	*/
	50	struct dma_mapping_ops {
	51	void * (alloc_coherent)(struct device dev, size_t size,
	52	dma_addr_t *dma_handle, gfp_t flag);
	53	void (free_coherent)(struct device dev, size_t size,
	54	void *vaddr, dma_addr_t dma_handle);
	55	dma_addr_t (map_single)(struct device dev, void *ptr,
	56	size_t size, enum dma_data_direction direction);
	57	void (unmap_single)(struct device dev, dma_addr_t dma_addr,
	58	size_t size, enum dma_data_direction direction);
	59	int (map_sg)(struct device dev, struct scatterlist *sg,
	60	int nents, enum dma_data_direction direction);
	61	void (unmap_sg)(struct device dev, struct scatterlist *sg,
	62	int nents, enum dma_data_direction direction);
	63	int (dma_supported)(struct device dev, u64 mask);
12d04eef BH	64	int (set_dma_mask)(struct device dev, u64 dma_mask);
	65	};
	66
	67	static inline struct dma_mapping_ops get_dma_ops(struct device dev)
	68	{
	69	/* We don't handle the NULL dev case for ISA for now. We could
	70	* do it via an out of line call but it is not needed for now. The
	71	* only ISA DMA device we support is the floppy and we have a hack
	72	* in the floppy driver directly to get a device for us.
	73	*/
	74	if (unlikely(dev == NULL \|\| dev->archdata.dma_ops == NULL))
	75	return NULL;
	76	return dev->archdata.dma_ops;
	77	}
	78
	79	static inline int dma_supported(struct device *dev, u64 mask)
	80	{
	81	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
	82
	83	if (unlikely(dma_ops == NULL))
	84	return 0;
	85	if (dma_ops->dma_supported == NULL)
	86	return 1;
	87	return dma_ops->dma_supported(dev, mask);
	88	}
	89
	90	static inline int dma_set_mask(struct device *dev, u64 dma_mask)
	91	{
	92	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
	93
	94	if (unlikely(dma_ops == NULL))
	95	return -EIO;
	96	if (dma_ops->set_dma_mask != NULL)
	97	return dma_ops->set_dma_mask(dev, dma_mask);
8f2ea1fd	98	if (!dev->dma_mask \|\| !dma_supported(dev, dma_mask))
12d04eef BH	99	return -EIO;
	100	*dev->dma_mask = dma_mask;
	101	return 0;
	102	}
	103
	104	static inline void dma_alloc_coherent(struct device dev, size_t size,
	105	dma_addr_t *dma_handle, gfp_t flag)
	106	{
	107	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
	108
	109	BUG_ON(!dma_ops);
	110	return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
	111	}
	112
	113	static inline void dma_free_coherent(struct device *dev, size_t size,
	114	void *cpu_addr, dma_addr_t dma_handle)
	115	{
	116	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
	117
	118	BUG_ON(!dma_ops);
	119	dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
	120	}
	121
	122	static inline dma_addr_t dma_map_single(struct device dev, void cpu_addr,
	123	size_t size,
	124	enum dma_data_direction direction)
	125	{
	126	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
	127
	128	BUG_ON(!dma_ops);
	129	return dma_ops->map_single(dev, cpu_addr, size, direction);
	130	}
	131
	132	static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
	133	size_t size,
	134	enum dma_data_direction direction)
	135	{
	136	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
	137
	138	BUG_ON(!dma_ops);
	139	dma_ops->unmap_single(dev, dma_addr, size, direction);
	140	}
	141
	142	static inline dma_addr_t dma_map_page(struct device dev, struct page page,
	143	unsigned long offset, size_t size,
	144	enum dma_data_direction direction)
	145	{
	146	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
	147
	148	BUG_ON(!dma_ops);
	149	return dma_ops->map_single(dev, page_address(page) + offset, size,
	150	direction);
	151	}
	152
	153	static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
	154	size_t size,
	155	enum dma_data_direction direction)
	156	{
	157	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
	158
	159	BUG_ON(!dma_ops);
	160	dma_ops->unmap_single(dev, dma_address, size, direction);
	161	}
	162
163	static inline int dma_map_sg(struct device dev, struct scatterlist sg,
164	int nents, enum dma_data_direction direction)
165	{
166	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
167
168	BUG_ON(!dma_ops);
169	return dma_ops->map_sg(dev, sg, nents, direction);
170	}
171
172	static inline void dma_unmap_sg(struct device dev, struct scatterlist sg,
173	int nhwentries,
174	enum dma_data_direction direction)
175	{
176	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
177
178	BUG_ON(!dma_ops);
179	dma_ops->unmap_sg(dev, sg, nhwentries, direction);
180	}
78b09735	181
12d04eef BH	182
	183	/*
	184	* Available generic sets of operations
	185	*/
	186	extern struct dma_mapping_ops dma_iommu_ops;
	187	extern struct dma_mapping_ops dma_direct_ops;
78b09735	188
92b20c40 BH	189	extern unsigned long dma_direct_offset;
92b20c40 BH	190
78b09735 SR	191	#else /* CONFIG_PPC64 */
78b09735 SR	192
1da177e4 LT	193	#define dma_supported(dev, mask) (1)
	194
	195	static inline int dma_set_mask(struct device *dev, u64 dma_mask)
	196	{
	197	if (!dev->dma_mask \|\| !dma_supported(dev, mask))
	198	return -EIO;
	199
	200	*dev->dma_mask = dma_mask;
	201
	202	return 0;
	203	}
	204
	205	static inline void dma_alloc_coherent(struct device dev, size_t size,
d27477c2	206	dma_addr_t * dma_handle,
dd0fc66f	207	gfp_t gfp)
1da177e4 LT	208	{
	209	#ifdef CONFIG_NOT_COHERENT_CACHE
	210	return __dma_alloc_coherent(size, dma_handle, gfp);
	211	#else
	212	void *ret;
	213	/* ignore region specifiers */
	214	gfp &= ~(__GFP_DMA \| __GFP_HIGHMEM);
	215
	216	if (dev == NULL \|\| dev->coherent_dma_mask < 0xffffffff)
	217	gfp \|= GFP_DMA;
	218
	219	ret = (void *)__get_free_pages(gfp, get_order(size));
	220
	221	if (ret != NULL) {
	222	memset(ret, 0, size);
	223	*dma_handle = virt_to_bus(ret);
	224	}
	225
	226	return ret;
	227	#endif
	228	}
	229
	230	static inline void
	231	dma_free_coherent(struct device dev, size_t size, void vaddr,
	232	dma_addr_t dma_handle)
	233	{
	234	#ifdef CONFIG_NOT_COHERENT_CACHE
	235	__dma_free_coherent(size, vaddr);
	236	#else
	237	free_pages((unsigned long)vaddr, get_order(size));
	238	#endif
	239	}
	240
	241	static inline dma_addr_t
	242	dma_map_single(struct device dev, void ptr, size_t size,
	243	enum dma_data_direction direction)
	244	{
	245	BUG_ON(direction == DMA_NONE);
	246
	247	__dma_sync(ptr, size, direction);
	248
	249	return virt_to_bus(ptr);
	250	}
	251
f774216d SB	252	static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
	253	size_t size,
	254	enum dma_data_direction direction)
	255	{
	256	/* We do nothing. */
	257	}
1da177e4 LT	258
	259	static inline dma_addr_t
	260	dma_map_page(struct device dev, struct page page,
	261	unsigned long offset, size_t size,
	262	enum dma_data_direction direction)
	263	{
	264	BUG_ON(direction == DMA_NONE);
	265
	266	__dma_sync_page(page, offset, size, direction);
	267
9f6a3d08	268	return page_to_bus(page) + offset;
1da177e4 LT	269	}
1da177e4 LT	270
f774216d SB	271	static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
	272	size_t size,
	273	enum dma_data_direction direction)
	274	{
	275	/* We do nothing. */
	276	}
1da177e4 LT	277
	278	static inline int
	279	dma_map_sg(struct device dev, struct scatterlist sg, int nents,
	280	enum dma_data_direction direction)
	281	{
	282	int i;
	283
	284	BUG_ON(direction == DMA_NONE);
	285
	286	for (i = 0; i < nents; i++, sg++) {
	287	BUG_ON(!sg->page);
	288	__dma_sync_page(sg->page, sg->offset, sg->length, direction);
	289	sg->dma_address = page_to_bus(sg->page) + sg->offset;
	290	}
	291
	292	return nents;
	293	}
	294
f774216d SB	295	static inline void dma_unmap_sg(struct device dev, struct scatterlist sg,
	296	int nhwentries,
	297	enum dma_data_direction direction)
	298	{
	299	/* We don't do anything here. */
	300	}
1da177e4	301
78b09735 SR	302	#endif /* CONFIG_PPC64 */
	303
	304	static inline void dma_sync_single_for_cpu(struct device *dev,
	305	dma_addr_t dma_handle, size_t size,
	306	enum dma_data_direction direction)
1da177e4 LT	307	{
1da177e4 LT	308	BUG_ON(direction == DMA_NONE);
1da177e4 LT	309	__dma_sync(bus_to_virt(dma_handle), size, direction);
	310	}
	311
78b09735 SR	312	static inline void dma_sync_single_for_device(struct device *dev,
	313	dma_addr_t dma_handle, size_t size,
	314	enum dma_data_direction direction)
1da177e4 LT	315	{
1da177e4 LT	316	BUG_ON(direction == DMA_NONE);
1da177e4 LT	317	__dma_sync(bus_to_virt(dma_handle), size, direction);
	318	}
	319
78b09735 SR	320	static inline void dma_sync_sg_for_cpu(struct device *dev,
	321	struct scatterlist *sg, int nents,
	322	enum dma_data_direction direction)
1da177e4 LT	323	{
	324	int i;
	325
	326	BUG_ON(direction == DMA_NONE);
	327
	328	for (i = 0; i < nents; i++, sg++)
	329	__dma_sync_page(sg->page, sg->offset, sg->length, direction);
	330	}
	331
78b09735 SR	332	static inline void dma_sync_sg_for_device(struct device *dev,
	333	struct scatterlist *sg, int nents,
	334	enum dma_data_direction direction)
1da177e4 LT	335	{
	336	int i;
	337
	338	BUG_ON(direction == DMA_NONE);
	339
	340	for (i = 0; i < nents; i++, sg++)
	341	__dma_sync_page(sg->page, sg->offset, sg->length, direction);
	342	}
	343
78b09735 SR	344	static inline int dma_mapping_error(dma_addr_t dma_addr)
	345	{
	346	#ifdef CONFIG_PPC64
	347	return (dma_addr == DMA_ERROR_CODE);
	348	#else
	349	return 0;
	350	#endif
	351	}
	352
1da177e4 LT	353	#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
	354	#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
	355	#ifdef CONFIG_NOT_COHERENT_CACHE
f67637ee	356	#define dma_is_consistent(d, h) (0)
1da177e4	357	#else
f67637ee	358	#define dma_is_consistent(d, h) (1)
1da177e4 LT	359	#endif
	360
	361	static inline int dma_get_cache_alignment(void)
	362	{
78b09735 SR	363	#ifdef CONFIG_PPC64
	364	/* no easy way to get cache size on all processors, so return
	365	* the maximum possible, to be safe */
1fd73c6b	366	return (1 << INTERNODE_CACHE_SHIFT);
78b09735	367	#else
1da177e4 LT	368	/*
	369	* Each processor family will define its own L1_CACHE_SHIFT,
	370	* L1_CACHE_BYTES wraps to this, so this is always safe.
	371	*/
	372	return L1_CACHE_BYTES;
78b09735	373	#endif
1da177e4 LT	374	}
1da177e4 LT	375
78b09735 SR	376	static inline void dma_sync_single_range_for_cpu(struct device *dev,
	377	dma_addr_t dma_handle, unsigned long offset, size_t size,
	378	enum dma_data_direction direction)
1da177e4 LT	379	{
	380	/* just sync everything for now */
	381	dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
	382	}
	383
78b09735 SR	384	static inline void dma_sync_single_range_for_device(struct device *dev,
	385	dma_addr_t dma_handle, unsigned long offset, size_t size,
	386	enum dma_data_direction direction)
1da177e4 LT	387	{
	388	/* just sync everything for now */
	389	dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
	390	}
	391
d3fa72e4	392	static inline void dma_cache_sync(struct device dev, void vaddr, size_t size,
78b09735	393	enum dma_data_direction direction)
1da177e4	394	{
78b09735	395	BUG_ON(direction == DMA_NONE);
1da177e4 LT	396	__dma_sync(vaddr, size, (int)direction);
	397	}
	398
88ced031	399	#endif /* __KERNEL__ */
78b09735	400	#endif /* _ASM_DMA_MAPPING_H */