[linux-2.6-block.git] / arch / microblaze / include / asm / dma-mapping.h

/*
 * Implements the generic device dma API for microblaze and the pci
 *
 * Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2009-2010 PetaLogix
 *
 * 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.
 *
 * This file is base on powerpc and x86 dma-mapping.h versions
 * Copyright (C) 2004 IBM
 */

#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
#define _ASM_MICROBLAZE_DMA_MAPPING_H

/*
 * See Documentation/DMA-API-HOWTO.txt and
 * Documentation/DMA-API.txt for documentation.
 */

#include <linux/types.h>
#include <linux/cache.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/dma-debug.h>
#include <linux/dma-attrs.h>
#include <asm/io.h>
#include <asm-generic/dma-coherent.h>
#include <asm/cacheflush.h>

#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)

#define __dma_alloc_coherent(dev, gfp, size, handle)	NULL
#define __dma_free_coherent(size, addr)		((void)0)

/*
 * Available generic sets of operations
 */
extern struct dma_map_ops dma_direct_ops;

static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
	return &dma_direct_ops;
}

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

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

static inline int dma_set_mask(struct device *dev, u64 dma_mask)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	if (unlikely(ops == NULL))
		return -EIO;
	if (ops->set_dma_mask)
		return 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;
}

#include <asm-generic/dma-mapping-common.h>

static inline void __dma_sync(unsigned long paddr,
			      size_t size, enum dma_data_direction direction)
{
	switch (direction) {
	case DMA_TO_DEVICE:
	case DMA_BIDIRECTIONAL:
		flush_dcache_range(paddr, paddr + size);
		break;
	case DMA_FROM_DEVICE:
		invalidate_dcache_range(paddr, paddr + size);
		break;
	default:
		BUG();
	}
}

static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
	struct dma_map_ops *ops = get_dma_ops(dev);

	debug_dma_mapping_error(dev, dma_addr);
	if (ops->mapping_error)
		return ops->mapping_error(dev, dma_addr);

	return (dma_addr == DMA_ERROR_CODE);
}

#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)

#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)

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 *memory;

	BUG_ON(!ops);

	memory = ops->alloc(dev, size, dma_handle, flag, attrs);

	debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
	return memory;
}

#define dma_free_coherent(d,s,c,h) dma_free_attrs(d, s, c, h, NULL)

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

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(virt_to_phys(vaddr), size, (int)direction);
}

#endif	/* _ASM_MICROBLAZE_DMA_MAPPING_H */
Commit	Line	Data
ccfe27d7 MS	1	/*
	2	* Implements the generic device dma API for microblaze and the pci
	3	*
	4	* Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
	5	* Copyright (C) 2009-2010 PetaLogix
	6	*
	7	* This file is subject to the terms and conditions of the GNU General
	8	* Public License. See the file COPYING in the main directory of this
	9	* archive for more details.
	10	*
	11	* This file is base on powerpc and x86 dma-mapping.h versions
	12	* Copyright (C) 2004 IBM
	13	*/
	14
	15	#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
	16	#define _ASM_MICROBLAZE_DMA_MAPPING_H
	17
	18	/*
395cf969	19	* See Documentation/DMA-API-HOWTO.txt and
ccfe27d7 MS	20	* Documentation/DMA-API.txt for documentation.
	21	*/
	22
	23	#include <linux/types.h>
	24	#include <linux/cache.h>
	25	#include <linux/mm.h>
	26	#include <linux/scatterlist.h>
	27	#include <linux/dma-debug.h>
	28	#include <linux/dma-attrs.h>
	29	#include <asm/io.h>
	30	#include <asm-generic/dma-coherent.h>
cf560c18	31	#include <asm/cacheflush.h>
ccfe27d7 MS	32
	33	#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
	34
	35	#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
	36	#define __dma_free_coherent(size, addr) ((void)0)
ccfe27d7	37
ccfe27d7 MS	38	/*
	39	* Available generic sets of operations
	40	*/
	41	extern struct dma_map_ops dma_direct_ops;
	42
	43	static inline struct dma_map_ops get_dma_ops(struct device dev)
	44	{
3b3b6853	45	return &dma_direct_ops;
ccfe27d7 MS	46	}
ccfe27d7 MS	47
ccfe27d7 MS	48	static inline int dma_supported(struct device *dev, u64 mask)
	49	{
	50	struct dma_map_ops *ops = get_dma_ops(dev);
	51
	52	if (unlikely(!ops))
	53	return 0;
	54	if (!ops->dma_supported)
	55	return 1;
	56	return ops->dma_supported(dev, mask);
	57	}
	58
ccfe27d7 MS	59	static inline int dma_set_mask(struct device *dev, u64 dma_mask)
	60	{
	61	struct dma_map_ops *ops = get_dma_ops(dev);
	62
	63	if (unlikely(ops == NULL))
	64	return -EIO;
	65	if (ops->set_dma_mask)
	66	return ops->set_dma_mask(dev, dma_mask);
	67	if (!dev->dma_mask \|\| !dma_supported(dev, dma_mask))
	68	return -EIO;
	69	*dev->dma_mask = dma_mask;
	70	return 0;
	71	}
	72
	73	#include <asm-generic/dma-mapping-common.h>
	74
cf560c18 EB	75	static inline void __dma_sync(unsigned long paddr,
	76	size_t size, enum dma_data_direction direction)
	77	{
	78	switch (direction) {
	79	case DMA_TO_DEVICE:
	80	case DMA_BIDIRECTIONAL:
	81	flush_dcache_range(paddr, paddr + size);
	82	break;
	83	case DMA_FROM_DEVICE:
	84	invalidate_dcache_range(paddr, paddr + size);
	85	break;
	86	default:
	87	BUG();
	88	}
	89	}
	90
ccfe27d7 MS	91	static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
	92	{
	93	struct dma_map_ops *ops = get_dma_ops(dev);
e728fa18 SK	94
e728fa18 SK	95	debug_dma_mapping_error(dev, dma_addr);
ccfe27d7 MS	96	if (ops->mapping_error)
	97	return ops->mapping_error(dev, dma_addr);
	98
	99	return (dma_addr == DMA_ERROR_CODE);
	100	}
	101
	102	#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
	103	#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
ccfe27d7	104
988624ec AP	105	#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
	106
	107	static inline void dma_alloc_attrs(struct device dev, size_t size,
	108	dma_addr_t *dma_handle, gfp_t flag,
	109	struct dma_attrs *attrs)
ccfe27d7 MS	110	{
	111	struct dma_map_ops *ops = get_dma_ops(dev);
	112	void *memory;
	113
	114	BUG_ON(!ops);
	115
988624ec	116	memory = ops->alloc(dev, size, dma_handle, flag, attrs);
ccfe27d7 MS	117
	118	debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
	119	return memory;
	120	}
	121
988624ec AP	122	#define dma_free_coherent(d,s,c,h) dma_free_attrs(d, s, c, h, NULL)
	123
	124	static inline void dma_free_attrs(struct device *dev, size_t size,
	125	void *cpu_addr, dma_addr_t dma_handle,
	126	struct dma_attrs *attrs)
ccfe27d7 MS	127	{
	128	struct dma_map_ops *ops = get_dma_ops(dev);
	129
	130	BUG_ON(!ops);
	131	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
988624ec	132	ops->free(dev, size, cpu_addr, dma_handle, attrs);
ccfe27d7 MS	133	}
ccfe27d7 MS	134
ccfe27d7 MS	135	static inline void dma_cache_sync(struct device dev, void vaddr, size_t size,
	136	enum dma_data_direction direction)
	137	{
	138	BUG_ON(direction == DMA_NONE);
cf560c18	139	__dma_sync(virt_to_phys(vaddr), size, (int)direction);
ccfe27d7 MS	140	}
	141
	142	#endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */