| /* |
| * 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 |
