| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __ASM_GENERIC_DMA_H |
| 3 | #define __ASM_GENERIC_DMA_H |
| 4 | /* |
| 5 | * This file traditionally describes the i8237 PC style DMA controller. |
| 6 | * Most architectures don't have these any more and can get the minimal |
| 7 | * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS. |
| 8 | * |
| 9 | * Some code relies on seeing MAX_DMA_ADDRESS though. |
| 10 | */ |
| 11 | #define MAX_DMA_ADDRESS PAGE_OFFSET |
| 12 | |
| 13 | extern int request_dma(unsigned int dmanr, const char *device_id); |
| 14 | extern void free_dma(unsigned int dmanr); |
| 15 | |
| 16 | #endif /* __ASM_GENERIC_DMA_H */ |