2 * Copyright (c) 2013 Daisuke Aoyama <aoyama@peach.ne.jp>
3 * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #ifndef _BCM2835_DMA_H_
30 #define _BCM2835_DMA_H_
32 #define BCM_DMA_BLOCK_SIZE 512
34 /* DMA0-DMA15 but DMA15 is special */
35 #define BCM_DMA_CH_MAX 12
37 /* request CH for any nubmer */
38 #define BCM_DMA_CH_INVALID (-1)
39 #define BCM_DMA_CH_ANY (-1)
40 #define BCM_DMA_CH_FAST1 (2)
41 #define BCM_DMA_CH_FAST2 (3)
43 /* Peripheral DREQ Signals (4.2.1.3) */
44 #define BCM_DMA_DREQ_NONE 0
45 #define BCM_DMA_DREQ_EMMC 11
46 #define BCM_DMA_DREQ_SDHOST 13
48 #define BCM_DMA_SAME_ADDR 0
49 #define BCM_DMA_INC_ADDR 1
51 #define BCM_DMA_32BIT 0
52 #define BCM_DMA_128BIT 1
54 int bcm_dma_allocate(int req_ch);
55 int bcm_dma_free(int ch);
56 int bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg);
57 int bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width);
58 int bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width);
59 int bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len);
60 uint32_t bcm_dma_length(int ch);
62 #endif /* _BCM2835_DMA_H_ */