1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef __ASM_GENERIC_DMA_H 3*4882a593Smuzhiyun #define __ASM_GENERIC_DMA_H 4*4882a593Smuzhiyun /* 5*4882a593Smuzhiyun * This file traditionally describes the i8237 PC style DMA controller. 6*4882a593Smuzhiyun * Most architectures don't have these any more and can get the minimal 7*4882a593Smuzhiyun * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS. 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * Some code relies on seeing MAX_DMA_ADDRESS though. 10*4882a593Smuzhiyun */ 11*4882a593Smuzhiyun #define MAX_DMA_ADDRESS PAGE_OFFSET 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun extern int request_dma(unsigned int dmanr, const char *device_id); 14*4882a593Smuzhiyun extern void free_dma(unsigned int dmanr); 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #endif /* __ASM_GENERIC_DMA_H */ 17