mirror of
https://github.com/torvalds/linux
synced 2024-10-07 11:53:31 +00:00
3b9c6c11f5
Architectures implement dma_is_consistent() in different ways (some misinterpret the definition of API in DMA-API.txt). So it hasn't been so useful for drivers. We have only one user of the API in tree. Unlikely out-of-tree drivers use the API. Even if we fix dma_is_consistent() in some architectures, it doesn't look useful at all. It was invented long ago for some old systems that can't allocate coherent memory at all. It's better to export only APIs that are definitely necessary for drivers. Let's remove this API. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/*
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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(void *vaddr, size_t, 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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