text: /*-
   * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   *
   * Copyright (c) 2013 Daisuke Aoyama <aoyama@peach.ne.jp>
   * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * $FreeBSD$
   */
  
  #ifndef	_BCM2835_DMA_H_
  #define	_BCM2835_DMA_H_
  
  #define	BCM_DMA_BLOCK_SIZE	512
  
  /* DMA0-DMA15 but DMA15 is special */
  #define	BCM_DMA_CH_MAX		12
  
  /* request CH for any nubmer */
  #define	BCM_DMA_CH_INVALID	(-1)
  #define	BCM_DMA_CH_ANY		(-1)
  
  /* Peripheral DREQ Signals (4.2.1.3) */
  #define	BCM_DMA_DREQ_NONE	0
  /*
   * XXX This doesn't seem to work for the Raspberry Pi 4, but the peripheral
   * documentation still lists it at 11.
   */
  #define	BCM_DMA_DREQ_EMMC	11
  #define	BCM_DMA_DREQ_SDHOST	13
  
  #define	BCM_DMA_SAME_ADDR	0
  #define	BCM_DMA_INC_ADDR	1
  
  #define	BCM_DMA_32BIT		0
  #define	BCM_DMA_128BIT		1
  
  int bcm_dma_allocate(int req_ch);
  int bcm_dma_free(int ch);
  int bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg);
  int bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width);
  int bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width);
  int bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len);
  uint32_t bcm_dma_length(int ch);
  
  #endif	/* _BCM2835_DMA_H_ */
  