| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | |
| 24 | static 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 |