xref: /netbsd-src/sys/arch/x68k/dev/dmacvar.h (revision ac90edd39294ab80fad71d7779b34375501a00e4)

/*	$NetBSD: dmacvar.h,v 1.12 2017/08/11 07:30:01 isaki Exp $	*/

/*-
 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Minoura Makoto.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * Hitachi HD63450 (= Motorola MC68450) DMAC driver for x68k.
 */

#include <dev/ic/mc68450reg.h>
#include <machine/bus.h>

#define DMAC_MAPSIZE 64

typedef int (*dmac_intr_handler_t)(void *);

/*
 * Structure that describes a single transfer.
 */
struct dmac_channel_stat;
struct dmac_dma_xfer {
	struct dmac_channel_stat *dx_channel;
	bus_dmamap_t	dx_dmamap;	/* dmamap tag */
	bus_dma_tag_t	dx_tag;		/* dma tag for the transfer */
	int		dx_ocr;		/* direction */
	int		dx_scr;		/* SCR value */
	void		*dx_device;	/* (initial) device address */
#ifdef DMAC_ARRAYCHAIN
	struct dmac_sg_array *dx_array;	/* DMAC array chain */
	int		dx_done;
#endif
};

/*
 * Struct that holds the channel status.
 * Embedded in the device softc for each channel.
 */
struct dmac_channel_stat {
	int			ch_channel; /* channel number */
	char			ch_name[8]; /* user device name */
	bus_space_handle_t	ch_bht;	/* bus_space handle */
	int			ch_dcr;	/* device description */
	int			ch_ocr;	/* operation size, request mode */
	int			ch_normalv; /* normal interrupt vector */
	int			ch_errorv; /* error interrupt vector */
	dmac_intr_handler_t	ch_normal; /* normal interrupt handler */
	dmac_intr_handler_t	ch_error; /* error interrupt handler */
	void			*ch_normalarg;
	void			*ch_errorarg;
	struct dmac_dma_xfer	ch_xfer;
	struct dmac_sg_array	*ch_map; /* transfer map for arraychain mode */
	bus_dma_segment_t	ch_seg[1];
	struct dmac_softc	*ch_softc; /* device softc link */
};

/*
 * DMAC softc
 */
struct dmac_softc {
	device_t		sc_dev;

	bus_space_tag_t		sc_bst;
	bus_space_handle_t	sc_bht;

	struct dmac_channel_stat sc_channels[DMAC_NCHAN];
};


#define DMAC_ADDR	0xe84000

#define DMAC_MAXSEGSZ	0xff00
#define DMAC_BOUNDARY	0

struct dmac_channel_stat *dmac_alloc_channel(device_t,
	int,		/* ch */
	const char *,	/* name */
	int, dmac_intr_handler_t, void *,	/* normal handler */
	int, dmac_intr_handler_t, void *,	/* error handler */
	uint8_t,	/* dcr */
	uint8_t		/* ocr */
);
int dmac_free_channel(device_t, int, void *);
		/* ch, channel */
struct dmac_dma_xfer *dmac_alloc_xfer(struct dmac_channel_stat *,
	bus_dma_tag_t, bus_dmamap_t);
int dmac_load_xfer(struct dmac_softc *, struct dmac_dma_xfer *);

int dmac_start_xfer(struct dmac_softc *, struct dmac_dma_xfer *);
int dmac_start_xfer_offset(struct dmac_softc *, struct dmac_dma_xfer *,
	u_int, u_int);
int dmac_abort_xfer(struct dmac_softc *, struct dmac_dma_xfer *);
/* Compatibility function: alloc, fill defaults, load */
struct dmac_dma_xfer *dmac_prepare_xfer(struct dmac_channel_stat *,
	bus_dma_tag_t, bus_dmamap_t, int, int, void *);
	/* chan, dmat, map, dir, sequence, dar */