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 12 enum 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) 21 extern enum coherent_io_user_state coherentio; 22 extern int hw_coherentio; 23 dev_is_dma_coherent(struct device * dev)24static inline bool dev_is_dma_coherent(struct device *dev) 25 { 26 return coherentio == IO_COHERENCE_ENABLED || 27 (coherentio == IO_COHERENCE_DEFAULT && hw_coherentio); 28 } 29 #else 30 #ifdef CONFIG_DMA_NONCOHERENT 31 #define coherentio IO_COHERENCE_DISABLED 32 #else 33 #define coherentio IO_COHERENCE_ENABLED 34 #endif 35 #define hw_coherentio 0 36 #endif /* CONFIG_DMA_MAYBE_COHERENT */ 37 38 #endif 39
