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>
158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/*
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* Copyright 2004-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef _BLACKFIN_DMA_MAPPING_H
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#define _BLACKFIN_DMA_MAPPING_H
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#include <asm/cacheflush.h>
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struct scatterlist;
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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 gfp);
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void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle);
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/*
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* Now for the API extensions over the pci_ one
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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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#define dma_supported(d, m) (1)
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static inline int
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dma_set_mask(struct device *dev, u64 dma_mask)
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{
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if (!dev->dma_mask || !dma_supported(dev, dma_mask))
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return -EIO;
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*dev->dma_mask = dma_mask;
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return 0;
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}
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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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extern void
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__dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
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static inline void
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__dma_sync_inline(dma_addr_t addr, size_t size, enum dma_data_direction dir)
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{
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switch (dir) {
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case DMA_NONE:
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BUG();
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case DMA_TO_DEVICE: /* writeback only */
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flush_dcache_range(addr, addr + size);
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break;
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case DMA_FROM_DEVICE: /* invalidate only */
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case DMA_BIDIRECTIONAL: /* flush and invalidate */
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/* Blackfin has no dedicated invalidate (it includes a flush) */
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invalidate_dcache_range(addr, addr + size);
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break;
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}
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}
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static inline void
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_dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
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{
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if (__builtin_constant_p(dir))
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__dma_sync_inline(addr, size, dir);
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else
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__dma_sync(addr, size, dir);
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}
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static inline dma_addr_t
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dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction dir)
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{
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_dma_sync((dma_addr_t)ptr, size, dir);
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return (dma_addr_t) ptr;
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}
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static inline dma_addr_t
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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 dir)
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{
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return dma_map_single(dev, page_address(page) + offset, size, dir);
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}
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static inline void
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dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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}
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static inline void
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dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction dir)
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{
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dma_unmap_single(dev, dma_addr, size, dir);
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}
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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 dir);
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static inline void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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int nhwentries, enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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}
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static inline void
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dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
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unsigned long offset, size_t size,
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enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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}
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static inline void
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dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
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unsigned long offset, size_t size,
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enum dma_data_direction dir)
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{
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_dma_sync(handle + offset, size, dir);
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}
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static inline void
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dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
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enum dma_data_direction dir)
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{
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dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
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}
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static inline void
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dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
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enum dma_data_direction dir)
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{
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dma_sync_single_range_for_device(dev, handle, 0, size, dir);
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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}
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extern void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir);
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static inline void
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dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction dir)
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{
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_dma_sync((dma_addr_t)vaddr, size, dir);
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}
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#endif /* _BLACKFIN_DMA_MAPPING_H */
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