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 */
17