freebsd-dev/sys/arm/allwinner/sunxi_dma_if.m

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#-
# Copyright (c) 2016 Jared D. McNeill <jmcneill@invisible.ca>
# All rights reserved.
#
# 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.
#
# $FreeBSD$
#
#include <sys/bus.h>
INTERFACE sunxi_dma;
HEADER {
#include <machine/bus.h>
struct sunxi_dma_config {
unsigned int dst_width;
unsigned int dst_burst_len;
unsigned int dst_drqtype;
bool dst_noincr;
unsigned int dst_blksize; /* DDMA-only */
unsigned int dst_wait_cyc; /* DDMA-only */
unsigned int src_width;
unsigned int src_burst_len;
unsigned int src_drqtype;
bool src_noincr;
unsigned int src_blksize; /* DDMA-only */
unsigned int src_wait_cyc; /* DDMA-only */
};
typedef void (*sunxi_dma_callback)(void *);
}
#
# Allocate DMA channel
#
METHOD void * alloc {
device_t dev;
bool dedicated;
sunxi_dma_callback callback;
void *callback_arg;
};
#
# Free DMA channel
#
METHOD void free {
device_t dev;
void *dmachan;
};
#
# Set DMA channel configuration
#
METHOD int set_config {
device_t dev;
void *dmachan;
const struct sunxi_dma_config *cfg;
};
#
# Start DMA channel transfer
#
METHOD int transfer {
device_t dev;
void *dmachan;
bus_addr_t src;
bus_addr_t dst;
size_t nbytes;
};
#
# Halt DMA channel transfer
#
METHOD void halt {
device_t dev;
void *dmachan;
};