815dd18788
Introduce a new architecture-specific get_arch_dma_ops() function that takes a struct bus_type * argument. Add get_dma_ops() in <linux/dma-mapping.h>. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Juergen Gross <jgross@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Russell King <linux@armlinux.org.uk> Cc: x86@kernel.org Signed-off-by: Doug Ledford <dledford@redhat.com>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
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* linux/arch/unicore32/include/asm/dma-mapping.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __UNICORE_DMA_MAPPING_H__
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#define __UNICORE_DMA_MAPPING_H__
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#ifdef __KERNEL__
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#include <linux/mm_types.h>
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#include <linux/scatterlist.h>
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#include <linux/swiotlb.h>
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#include <asm/memory.h>
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#include <asm/cacheflush.h>
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extern const struct dma_map_ops swiotlb_dma_map_ops;
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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return &swiotlb_dma_map_ops;
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}
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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{
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if (dev && dev->dma_mask)
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return addr + size - 1 <= *dev->dma_mask;
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return 1;
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}
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static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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return paddr;
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}
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static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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return daddr;
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}
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static inline void dma_mark_clean(void *addr, size_t size) {}
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static inline void dma_cache_sync(struct device *dev, void *vaddr,
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size_t size, enum dma_data_direction direction)
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{
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unsigned long start = (unsigned long)vaddr;
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unsigned long end = start + size;
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switch (direction) {
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case DMA_NONE:
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BUG();
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case DMA_FROM_DEVICE:
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case DMA_BIDIRECTIONAL: /* writeback and invalidate */
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__cpuc_dma_flush_range(start, end);
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break;
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case DMA_TO_DEVICE: /* writeback only */
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__cpuc_dma_clean_range(start, end);
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break;
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}
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}
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#endif /* __KERNEL__ */
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#endif
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