/*	$NetBSD: nextdmavar.h,v 1.17 2014/03/25 19:41:32 christos Exp $	*/
/*
 * Copyright (c) 1998 Darrin B. Jewell
 * 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 ``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 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.
 */


struct nextdma_channel {
	const char		*nd_name;
	int			nd_base;
	int			nd_size;
	u_long			nd_intr;
	int			(*nd_intrfunc)(void *);
};

struct nextdma_config {
	/* This is called to get another map to dma */
	bus_dmamap_t		(*nd_continue_cb)(void *);
	/* This is called when a map has completed dma */
	void			(*nd_completed_cb)(bus_dmamap_t, void *);
	/* This is called when dma shuts down */
	void			(*nd_shutdown_cb) (void *);
	/* callback argument */
	void			*nd_cb_arg;					
};

struct nextdma_status {
	bus_dmamap_t	nd_map;			/* map currently in dd_next */
	int		nd_idx;			/* idx of segment currently in dd_next */
	bus_dmamap_t	nd_map_cont;		/* map needed to continue DMA */
	int		nd_idx_cont;		/* segment index to continue DMA */
	int		nd_exception;
};

struct nextdma_softc {
	device_t		sc_dev;
	struct nextdma_channel	*sc_chan;
	bus_space_handle_t	sc_bsh;		/* bus space handle */
	bus_space_tag_t		sc_bst;		/* bus space tag */
	bus_dma_tag_t		sc_dmat;
	struct nextdma_config	sc_conf;
	struct nextdma_status	sc_stat;
	struct evcnt		sc_intrcnt;
};

#define nextdma_setconf(nsc, elem, val) nsc->sc_conf.nd_##elem = (val)

/* Configure the interface & initialize private structure vars */
void nextdma_config(struct nextdma_softc *);
void nextdma_init(struct nextdma_softc *);
void nextdma_start(struct nextdma_softc *, u_long);

/* query to see if nextdma is finished */
int nextdma_finished(struct nextdma_softc *);
void nextdma_reset(struct nextdma_softc *);

void nextdma_print(struct nextdma_softc *);

struct nextdma_softc *nextdma_findchannel(const char *);

void ndtrace_printf(const char *fmt, ...) __printflike(1, 2);
int ndtrace_empty(void);
void ndtrace_reset(void);
void ndtrace_addc(int);
const char *ndtrace_get(void);