ec950d0aef
(1) The channel mask is get from "brcm,dma-channel-mask" property of
dma node, and if not provided, from "broadcom,channels" property.
(2) Consequently, sdhci driver does not allocate any specific channel.
(3) Use CS_RESET bit for initial channel reset.
Differential Revision: https://reviews.freebsd.org/D4303
61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
/*
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* Copyright (c) 2013 Daisuke Aoyama <aoyama@peach.ne.jp>
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* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@bluezbox.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _BCM2835_DMA_H_
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#define _BCM2835_DMA_H_
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#define BCM_DMA_BLOCK_SIZE 512
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/* DMA0-DMA15 but DMA15 is special */
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#define BCM_DMA_CH_MAX 12
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/* request CH for any nubmer */
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#define BCM_DMA_CH_INVALID (-1)
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#define BCM_DMA_CH_ANY (-1)
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/* Peripheral DREQ Signals (4.2.1.3) */
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#define BCM_DMA_DREQ_NONE 0
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#define BCM_DMA_DREQ_EMMC 11
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#define BCM_DMA_DREQ_SDHOST 13
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#define BCM_DMA_SAME_ADDR 0
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#define BCM_DMA_INC_ADDR 1
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#define BCM_DMA_32BIT 0
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#define BCM_DMA_128BIT 1
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int bcm_dma_allocate(int req_ch);
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int bcm_dma_free(int ch);
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int bcm_dma_setup_intr(int ch, void (*func)(int, void *), void *arg);
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int bcm_dma_setup_src(int ch, int dreq, int inc_addr, int width);
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int bcm_dma_setup_dst(int ch, int dreq, int inc_addr, int width);
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int bcm_dma_start(int ch, vm_paddr_t src, vm_paddr_t dst, int len);
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uint32_t bcm_dma_length(int ch);
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#endif /* _BCM2835_DMA_H_ */
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