LXR linux/arch/mips/include/asm/dma-coherence.h

   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#else
  24#ifdef CONFIG_DMA_COHERENT
  25#define coherentio      IO_COHERENCE_ENABLED
  26#else
  27#define coherentio      IO_COHERENCE_DISABLED
  28#endif
  29#define hw_coherentio   0
  30#endif /* CONFIG_DMA_MAYBE_COHERENT */
  31
  32#endif
  33