/*	$NetBSD: sivar.h,v 1.1 1996/03/26 15:01:15 gwr Exp $	*/

/*
 * Copyright (c) 1995 David Jones, Gordon W. Ross
 * 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.
 * 3. The name of the authors may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 4. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by
 *      David Jones and Gordon Ross
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
 */

/*
 * This file defines the interface between si.c and
 * the bus-specific files: si_obio.c, si_vme.c
 */

/*
 * Transfers smaller than this are done using PIO
 * (on assumption they're not worth DMA overhead)
 */
#define	MIN_DMA_LEN 128

/*
 * Transfers lager than 65535 bytes need to be split-up.
 * (Some of the FIFO logic has only 16 bits counters.)
 * Make the size an integer multiple of the page size
 * to avoid buf/cluster remap problems.  (paranoid?)
 */
#define	MAX_DMA_LEN 0xE000

/*
 * This structure is used to keep track of mapped DMA requests.
 */
struct si_dma_handle {
	int 		dh_flags;
#define	SIDH_BUSY	1		/* This DH is in use */
#define	SIDH_OUT	2		/* DMA does data out (write) */
	u_char *	dh_addr;	/* KVA of start of buffer */
	int 		dh_maplen;	/* Length of KVA mapping. */
	long		dh_dvma;	/* VA of buffer in DVMA space */
};

/*
 * The first structure member has to be the ncr5380_softc
 * so we can just cast to go back and fourth between them.
 */
struct si_softc {
	struct ncr5380_softc	ncr_sc;
	volatile struct si_regs	*sc_regs;
	int		sc_adapter_type;
	int		sc_adapter_iv_am;	/* int. vec + address modifier */
	int 	sc_reqlen;  		/* requested transfer length */
	struct si_dma_handle *sc_dma;
	/* DMA command block for the OBIO controller. */
	void *sc_dmacmd;
};

extern int si_debug;

void si_attach __P((struct si_softc *));
int  si_intr __P((void *));

void si_reset_adapter __P((struct ncr5380_softc *));

void si_dma_alloc __P((struct ncr5380_softc *));
void si_dma_free __P((struct ncr5380_softc *));
void si_dma_poll __P((struct ncr5380_softc *));