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
  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 */