diff options
Diffstat (limited to 'sys/arm/broadcom/bcm2835/bcm2835_dma.h')
| -rw-r--r-- | sys/arm/broadcom/bcm2835/bcm2835_dma.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/sys/arm/broadcom/bcm2835/bcm2835_dma.h b/sys/arm/broadcom/bcm2835/bcm2835_dma.h new file mode 100644 index 000000000000..44c2cd34e804 --- /dev/null +++ b/sys/arm/broadcom/bcm2835/bcm2835_dma.h @@ -0,0 +1,66 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2013 Daisuke Aoyama <aoyama@peach.ne.jp> + * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _BCM2835_DMA_H_ +#define _BCM2835_DMA_H_ + +#define BCM_DMA_BLOCK_SIZE 512 + +/* DMA0-DMA15 but DMA15 is special */ +#define BCM_DMA_CH_MAX 12 + +/* request CH for any nubmer */ +#define BCM_DMA_CH_INVALID (-1) +#define BCM_DMA_CH_ANY (-1) + +/* Peripheral DREQ Signals (4.2.1.3) */ +#define BCM_DMA_DREQ_NONE 0 +/* + * XXX This doesn't seem to work for the Raspberry Pi 4, but the peripheral + * documentation still lists it at 11. + */ +#define BCM_DMA_DREQ_EMMC 11 +#define BCM_DMA_DREQ_SDHOST 13 + +#define BCM_DMA_SAME_ADDR 0 +#define BCM_DMA_INC_ADDR 1 + +#define BCM_DMA_32BIT 0 +#define BCM_DMA_128BIT 1 + +int bcm_dma_allocate(int req_ch); +int bcm_dma_free(int ch); +int bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg); +int bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width); +int bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width); +int bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len); +uint32_t bcm_dma_length(int ch); + +#endif /* _BCM2835_DMA_H_ */ |