FreeBSD/Linux Kernel Cross Reference
sys/arm/broadcom/bcm2835/bcm2835_dma.h

     /*-
      * 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_ */

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