mirror of https://gitee.com/openkylin/linux.git
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* Implements the generic device dma API for microblaze and the pci
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*
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* Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2009-2010 PetaLogix
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* This file is base on powerpc and x86 dma-mapping.h versions
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* Copyright (C) 2004 IBM
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*/
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#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
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#define _ASM_MICROBLAZE_DMA_MAPPING_H
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/*
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* See Documentation/DMA-API-HOWTO.txt and
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* Documentation/DMA-API.txt for documentation.
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*/
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#include <linux/types.h>
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#include <linux/cache.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-debug.h>
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#include <asm/io.h>
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#include <asm/cacheflush.h>
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#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
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#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
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#define __dma_free_coherent(size, addr) ((void)0)
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/*
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* Available generic sets of operations
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*/
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extern struct dma_map_ops dma_direct_ops;
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static inline struct dma_map_ops *get_dma_ops(struct device *dev)
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{
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return &dma_direct_ops;
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}
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static inline void __dma_sync(unsigned long paddr,
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size_t size, enum dma_data_direction direction)
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{
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switch (direction) {
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case DMA_TO_DEVICE:
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case DMA_BIDIRECTIONAL:
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flush_dcache_range(paddr, paddr + size);
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break;
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case DMA_FROM_DEVICE:
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invalidate_dcache_range(paddr, paddr + size);
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break;
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default:
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BUG();
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}
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}
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static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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__dma_sync(virt_to_phys(vaddr), size, (int)direction);
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}
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#endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */
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