1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013 Daisuke Aoyama <aoyama@peach.ne.jp>
5 * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 */
28
29#ifndef	_BCM2835_DMA_H_
30#define	_BCM2835_DMA_H_
31
32#define	BCM_DMA_BLOCK_SIZE	512
33
34/* DMA0-DMA15 but DMA15 is special */
35#define	BCM_DMA_CH_MAX		12
36
37/* request CH for any nubmer */
38#define	BCM_DMA_CH_INVALID	(-1)
39#define	BCM_DMA_CH_ANY		(-1)
40
41/* Peripheral DREQ Signals (4.2.1.3) */
42#define	BCM_DMA_DREQ_NONE	0
43/*
44 * XXX This doesn't seem to work for the Raspberry Pi 4, but the peripheral
45 * documentation still lists it at 11.
46 */
47#define	BCM_DMA_DREQ_EMMC	11
48#define	BCM_DMA_DREQ_SDHOST	13
49
50#define	BCM_DMA_SAME_ADDR	0
51#define	BCM_DMA_INC_ADDR	1
52
53#define	BCM_DMA_32BIT		0
54#define	BCM_DMA_128BIT		1
55
56int bcm_dma_allocate(int req_ch);
57int bcm_dma_free(int ch);
58int bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg);
59int bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width);
60int bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width);
61int bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len);
62uint32_t bcm_dma_length(int ch);
63
64#endif	/* _BCM2835_DMA_H_ */
65