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Various architectures support both coherent and non-coherent dma on a per-device basis. Move the dma_noncoherent flag from the mips archdata field to struct device proper to prepare the infrastructure for reuse on other architectures. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Paul Burton <paul.burton@mips.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
38 lines
983 B
C
38 lines
983 B
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
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*
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*/
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#ifndef __ASM_DMA_COHERENCE_H
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#define __ASM_DMA_COHERENCE_H
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enum coherent_io_user_state {
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IO_COHERENCE_DEFAULT,
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IO_COHERENCE_ENABLED,
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IO_COHERENCE_DISABLED,
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};
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#if defined(CONFIG_DMA_PERDEV_COHERENT)
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/* Don't provide (hw_)coherentio to avoid misuse */
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#elif defined(CONFIG_DMA_MAYBE_COHERENT)
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extern enum coherent_io_user_state coherentio;
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extern int hw_coherentio;
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static inline bool dev_is_dma_coherent(struct device *dev)
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{
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return coherentio == IO_COHERENCE_ENABLED ||
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(coherentio == IO_COHERENCE_DEFAULT && hw_coherentio);
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}
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#else
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#ifdef CONFIG_DMA_NONCOHERENT
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#define coherentio IO_COHERENCE_DISABLED
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#else
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#define coherentio IO_COHERENCE_ENABLED
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#endif
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#define hw_coherentio 0
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#endif /* CONFIG_DMA_MAYBE_COHERENT */
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#endif
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