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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/tile/include/asm/dma-mapping.h
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/*

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 * Copyright 2010 Tilera Corporation. All Rights Reserved.

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 *

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 *   This program is free software; you can redistribute it and/or

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 *   modify it under the terms of the GNU General Public License

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 *   as published by the Free Software Foundation, version 2.

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 *

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 *   This program is distributed in the hope that it will be useful, but

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 *   WITHOUT ANY WARRANTY; without even the implied warranty of

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 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or

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 *   NON INFRINGEMENT.  See the GNU General Public License for

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 *   more details.

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 */

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#ifndef _ASM_TILE_DMA_MAPPING_H

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#define _ASM_TILE_DMA_MAPPING_H

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#include <linux/mm.h>

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#include <linux/scatterlist.h>

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#include <linux/cache.h>

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#include <linux/io.h>

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/*

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 * Note that on x86 and powerpc, there is a "struct dma_mapping_ops"

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 * that is used for all the DMA operations.  For now, we don't have an

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 * equivalent on tile, because we only have a single way of doing DMA.

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 * (Tilera bug 7994 to use dma_mapping_ops.)

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 */

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#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)

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#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)

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extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,

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			  enum dma_data_direction);

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extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,

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			     size_t size, enum dma_data_direction);

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extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,

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	       enum dma_data_direction);

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extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,

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			 int nhwentries, enum dma_data_direction);

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extern dma_addr_t dma_map_page(struct device *dev, struct page *page,

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			       unsigned long offset, size_t size,

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			       enum dma_data_direction);

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extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,

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			   size_t size, enum dma_data_direction);

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extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,

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				int nelems, enum dma_data_direction);

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extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,

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				   int nelems, enum dma_data_direction);

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void *dma_alloc_coherent(struct device *dev, size_t size,

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			   dma_addr_t *dma_handle, gfp_t flag);

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void dma_free_coherent(struct device *dev, size_t size,

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			 void *vaddr, dma_addr_t dma_handle);

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extern void dma_sync_single_for_cpu(struct device *, dma_addr_t, size_t,

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				    enum dma_data_direction);

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extern void dma_sync_single_for_device(struct device *, dma_addr_t,

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				       size_t, enum dma_data_direction);

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extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t,

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					  unsigned long offset, size_t,

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					  enum dma_data_direction);

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extern void dma_sync_single_range_for_device(struct device *, dma_addr_t,

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					     unsigned long offset, size_t,

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					     enum dma_data_direction);

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extern void dma_cache_sync(struct device *dev, void *vaddr, size_t,

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			   enum dma_data_direction);

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static inline int

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dma_mapping_error(struct device *dev, dma_addr_t dma_addr)

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{

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	return 0;

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}

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static inline int

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dma_supported(struct device *dev, u64 mask)

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{

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	return 1;

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}

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static inline int

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dma_set_mask(struct device *dev, u64 mask)

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{

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	if (!dev->dma_mask || !dma_supported(dev, mask))

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		return -EIO;

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	*dev->dma_mask = mask;

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	return 0;

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}

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#endif /* _ASM_TILE_DMA_MAPPING_H */

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