LXR linux/include/asm-generic/dma.h

   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 */
  17