dma.h 553 B

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  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. extern int request_dma(unsigned int dmanr, const char *device_id);
  13. extern void free_dma(unsigned int dmanr);
  14. #endif /* __ASM_GENERIC_DMA_H */