1 /* 2 * Copyright (c) 2013 Daisuke Aoyama <aoyama@peach.ne.jp> 3 * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 13 * 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 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 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 #define BCM_DMA_DREQ_EMMC 11 44 #define BCM_DMA_DREQ_SDHOST 13 45 46 #define BCM_DMA_SAME_ADDR 0 47 #define BCM_DMA_INC_ADDR 1 48 49 #define BCM_DMA_32BIT 0 50 #define BCM_DMA_128BIT 1 51 52 int bcm_dma_allocate(int req_ch); 53 int bcm_dma_free(int ch); 54 int bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg); 55 int bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width); 56 int bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width); 57 int bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len); 58 uint32_t bcm_dma_length(int ch); 59 60 #endif /* _BCM2835_DMA_H_ */ 61