mirror of https://gitee.com/openkylin/linux.git
39 lines
983 B
C
39 lines
983 B
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
|
|
*
|
|
*/
|
|
#ifndef __ASM_DMA_COHERENCE_H
|
|
#define __ASM_DMA_COHERENCE_H
|
|
|
|
enum coherent_io_user_state {
|
|
IO_COHERENCE_DEFAULT,
|
|
IO_COHERENCE_ENABLED,
|
|
IO_COHERENCE_DISABLED,
|
|
};
|
|
|
|
#if defined(CONFIG_DMA_PERDEV_COHERENT)
|
|
/* Don't provide (hw_)coherentio to avoid misuse */
|
|
#elif defined(CONFIG_DMA_MAYBE_COHERENT)
|
|
extern enum coherent_io_user_state coherentio;
|
|
extern int hw_coherentio;
|
|
|
|
static inline bool dev_is_dma_coherent(struct device *dev)
|
|
{
|
|
return coherentio == IO_COHERENCE_ENABLED ||
|
|
(coherentio == IO_COHERENCE_DEFAULT && hw_coherentio);
|
|
}
|
|
#else
|
|
#ifdef CONFIG_DMA_NONCOHERENT
|
|
#define coherentio IO_COHERENCE_DISABLED
|
|
#else
|
|
#define coherentio IO_COHERENCE_ENABLED
|
|
#endif
|
|
#define hw_coherentio 0
|
|
#endif /* CONFIG_DMA_MAYBE_COHERENT */
|
|
|
|
#endif
|