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
13extern int request_dma(unsigned int dmanr, const char *device_id);
14extern void free_dma(unsigned int dmanr);
15
16#endif /* __ASM_GENERIC_DMA_H */

 
 1#ifndef __ASM_GENERIC_DMA_H
 2#define __ASM_GENERIC_DMA_H
 3/*
 4 * This file traditionally describes the i8237 PC style DMA controller.
 5 * Most architectures don't have these any more and can get the minimal
 6 * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS.
 7 *
 8 * Some code relies on seeing MAX_DMA_ADDRESS though.
 9 */
10#define MAX_DMA_ADDRESS PAGE_OFFSET
11
12extern int request_dma(unsigned int dmanr, const char *device_id);
13extern void free_dma(unsigned int dmanr);
14
15#endif /* __ASM_GENERIC_DMA_H */