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