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MIPS: Add option to disable software I/O coherency.

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Some MIPS controllers have hardware I/O coherency. This patch
detects those and turns off software coherency. A new kernel
command line option also allows the user to manually turn
software coherency on or off.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
This commit is contained in:
Steven J. Hill
2013-03-25 13:47:29 -05:00
parent c34c09c81d
commit b6d92b4a6b
7 changed files with 112 additions and 24 deletions
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15
arch/mips/include/asm/dma-coherence.h Normal file
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/*
* 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
extern int coherentio;
extern int hw_coherentio;
#endif