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 56 int bcm_dma_allocate(int req_ch); 57 int bcm_dma_free(int ch); 58 int bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg); 59 int bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width); 60 int bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width); 61 int bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len); 62 uint32_t bcm_dma_length(int ch); 63 64 #endif /* _BCM2835_DMA_H_ */ 65