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Diffstat (limited to 'arch/mips/include/asm/dma-coherence.h')
| -rw-r--r-- | arch/mips/include/asm/dma-coherence.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/mips/include/asm/dma-coherence.h b/arch/mips/include/asm/dma-coherence.h new file mode 100644 index 000000000..5eaa1fcc8 --- /dev/null +++ b/arch/mips/include/asm/dma-coherence.h @@ -0,0 +1,38 @@ +/* + * 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 |