/*
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Van Jacobson of Lawrence Berkeley Laboratory.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)scsivar.h	7.1 (Berkeley) 5/8/90
 *	$Id: scsivar.h,v 1.7 1994/02/11 07:02:13 chopps Exp $
 */

/*
 * The largest single request will be MAXPHYS bytes which will require
 * at most MAXPHYS/NBPG+1 chain elements to describe, i.e. if none of
 * the buffer pages are physically contiguous (MAXPHYS/NBPG) and the
 * buffer is not page aligned (+1).
 */
#define	DMAMAXIO	(MAXPHYS/NBPG+1)

struct	dma_chain {
	int	dc_count;
	char	*dc_addr;
};

struct	scsi_softc {
	struct	amiga_ctlr *sc_ac;
	struct	devqueue sc_dq;
	struct	devqueue sc_sq;
	dmafree_t dmafree;
	dmago_t   dmago;
	dmanext_t dmanext;
	dmastop_t dmastop;
	char	  *dmabuffer;
	char	  *dmausrbuf;
	u_long	  dmausrlen;
	u_long    dmamask;
	u_char	sc_flags;
	u_long	sc_clock_freq;
	/* one for each target */
	struct syncpar {
	  u_char state;
	  u_char period, offset;
	} sc_sync[8];
	u_char	sc_scsi_addr;
	u_char	sc_stat[2];
	u_char	sc_msg[7];
	void	*sc_hwaddr;	/* pointer to controller-specific DMA registers */
	u_short	dmatimo;
	u_short	sc_cmd;
	int	sc_tc;
	struct	dma_chain *sc_cur;
	struct	dma_chain *sc_last;
	struct	dma_chain sc_chain[DMAMAXIO];
};

/* sc_flags */
#define	SCSI_IO		0x80	/* DMA I/O in progress */
#define	SCSI_ALIVE	0x01	/* controller initialized */
#ifdef DEBUG
#define	SCSI_PAD	0x02	/* 'padded' transfer in progress */
#endif
#define SCSI_SELECTED	0x04	/* bus is in selected state. Needed for
				   correct abort procedure. */
#define SCSI_DMA24	0x10	/* controller can only DMA to ZorroII
				   address space */
#define SCSI_READ24	0x20	/* DMA input needs to be copied from
				   ZorroII buffer to real buffer */
#define	SCSI_INTR	0x40	/* SCSI interrupt expected */

/* sync states */
#define SYNC_START	0	/* no sync handshake started */
#define SYNC_SENT	1	/* we sent sync request, no answer yet */
#define SYNC_DONE	2	/* target accepted our (or inferior) settings,
				   or it rejected the request and we stay async */
#ifdef DEBUG
#define	DDB_FOLLOW	0x04
#define DDB_IO		0x08
#endif