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