1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (C) 2006  Ralf Baechle <ralf@linux-mips.org>
 7 *
 8 */
 9#ifndef __ASM_DMA_COHERENCE_H
10#define __ASM_DMA_COHERENCE_H
11
12enum coherent_io_user_state {
13	IO_COHERENCE_DEFAULT,
14	IO_COHERENCE_ENABLED,
15	IO_COHERENCE_DISABLED,
16};
17
18#if defined(CONFIG_DMA_PERDEV_COHERENT)
19/* Don't provide (hw_)coherentio to avoid misuse */
20#elif defined(CONFIG_DMA_MAYBE_COHERENT)
21extern enum coherent_io_user_state coherentio;
22extern int hw_coherentio;
23
24static inline bool dev_is_dma_coherent(struct device *dev)
25{
26	return coherentio == IO_COHERENCE_ENABLED ||
27		(coherentio == IO_COHERENCE_DEFAULT && hw_coherentio);
28}
29#else
30#ifdef CONFIG_DMA_NONCOHERENT
31#define coherentio	IO_COHERENCE_DISABLED
32#else
33#define coherentio	IO_COHERENCE_ENABLED
34#endif
35#define hw_coherentio	0
36#endif /* CONFIG_DMA_MAYBE_COHERENT */
37
38#endif