| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __ASM_GENERIC_DMA_H |
| #define __ASM_GENERIC_DMA_H |
| /* |
| * This file traditionally describes the i8237 PC style DMA controller. |
| * Most architectures don't have these any more and can get the minimal |
| * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS. |
| * |
| * Some code relies on seeing MAX_DMA_ADDRESS though. |
| */ |
| #define MAX_DMA_ADDRESS PAGE_OFFSET |
| |
| extern int request_dma(unsigned int dmanr, const char *device_id); |
| extern void free_dma(unsigned int dmanr); |
| |
| #endif /* __ASM_GENERIC_DMA_H */ |
