/*	$NetBSD: xyvar.h,v 1.5 2000/01/21 23:43:10 thorpej Exp $	*/

/*
 *
 * Copyright (c) 1995 Charles D. Cranor
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Charles D. Cranor.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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.
 */

/*
 * x y v a r . h
 *
 * this file defines the software structure we use to control the
 * 450/451.
 *
 * author: Chuck Cranor <chuck@ccrc.wustl.edu>
 */

/*
 * i/o request: wrapper for hardware's iopb data structure
 */
struct xy_iorq {
	struct xy_iopb *iopb;	/* address of matching iopb */
	struct xy_iopb *dmaiopb;/* DMA address of above */
	struct xyc_softc *xyc;	/* who we are working with */
	struct xy_softc *xy;	/* which disk */
	int ttl;		/* time to live */
	int mode;		/* current mode (state+other data) */
	int tries;		/* number of times we have tried it */
	int errno;		/* error number if we fail */
	int lasterror;		/* last error we got */
	int blockno;		/* starting block no for this xfer */
	int sectcnt;		/* number of sectors in xfer */
	char *dbuf;		/* KVA of data buffer (advances) */
	struct buf *buf;	/* for NORM */
	bus_dmamap_t dmamap;	/* DMA I/O handle */
};

/*
 * state
 */
#define XY_SUB_MASK	0xf0	/* mask bits for state */
#define XY_SUB_FREE	0x00	/* free */
#define XY_SUB_NORM	0x10	/* normal I/O request */
#define XY_SUB_WAIT	0x20	/* normal I/O request in the
                                   context of a process */
#define XY_SUB_POLL	0x30	/* polled mode */
#define XY_SUB_DONE	0x40	/* not active, but can't be free'd yet */
#define XY_SUB_NOQ	0x50	/* don't queue, just submit (internal) */

#define XY_STATE(X) ((X) & XY_SUB_MASK) /* extract state from mode */
#define XY_NEWSTATE(OLD, NEW) (((OLD) & ~XY_SUB_MASK) |(NEW)) /* new state */


/*
 * other mode data
 */
#define XY_MODE_VERBO	0x08	/* print error messages */
#define XY_MODE_B144	0x04	/* handling a bad144 sector */


/*
 * software timers and flags
 */
#define XYC_SUBWAITLIM	4	/* max number of "done" IOPBs there can be
				   where we still allow a SUB_WAIT command */
#define XYC_TICKCNT	(5*hz)	/* call xyc_tick on this interval (5 sec) */
#define XYC_MAXTTL	2	/* max number of xy ticks to live */
#define XYC_NOUNIT	(-1)	/* for xycmd: no unit number */

/*
 * a "xy_softc" structure contains per-disk state info.
 */
struct xy_softc {
	struct device sc_dev;	/* device struct, reqd by autoconf */
	struct disk sc_dk;	/* generic disk info */
	struct xyc_softc *parent;/* parent */
	u_short flags;		/* flags */
	u_short state;		/* device state */
	int xy_drive;		/* unit number */
	int drive_type;		/* drive type (as per disk) */

	/* geometry */
	u_short ncyl, acyl, pcyl;	/* number of cyl's */
	u_short sectpercyl;	/* nhead*nsect */
	u_char nhead;		/* number of heads */
	u_char nsect;		/* number of sectors per track */
	u_char hw_spt;		/* as above, but includes spare sectors */
	struct xy_iorq *xyrq;	/* this disk's ioreq structure */
	struct buf_queue xyq;	/* queued I/O requests */
	struct dkbad dkb;	/* bad144 sectors */
};

/*
 * flags
 */

#define XY_WLABEL 0x0001           /* write label */
/*
 * state
 */

#define XY_DRIVE_UNKNOWN 0         /* never talked to it */
#define XY_DRIVE_ATTACHING 1       /* attach in progress */
#define XY_DRIVE_NOLABEL 2         /* drive on-line, no label */
#define XY_DRIVE_ONLINE  3         /* drive is on-line */

/*
 * a "xyc_softc" structure contains per-disk-controller state info,
 * including a list of active controllers.
 */

struct xyc_softc {
	struct device sc_dev;            /* device struct, reqd by autoconf */
	struct evcnt sc_intrcnt;         /* event counter (for vmstat -i) */

	struct xyc *xyc;                 /* vaddr of vme registers */

	struct xy_softc *sc_drives[XYC_MAXDEV]; /* drives on this controller */
	int ipl;                         /* interrupt level */
	int vector;                      /* interrupt vector */
	bus_dma_tag_t dmatag;	 	 /* Bus DMA tag */

	struct xy_iorq *reqs;            /* i/o requests */
	struct xy_iopb *iopbase;         /* iopb base addr (maps iopb->iorq) */
	struct xy_iopb *dvmaiopb;        /* iopb base in DVMA space, not kvm */

	struct xy_iorq *ciorq;		 /* controller's iorq */
	struct xy_iopb *ciopb;		 /* controller's iopb */

	int xy_hand;			 /* hand */
	struct xy_iorq *xy_chain[XYC_MAXIOPB];
				   /* current chain */
	int no_ols;		   /* disable overlap seek for stupid 450s */
};

/*
 * reset blast modes
 */

#define XY_RSET_NONE (struct xy_iorq *)(-1)   /* restart all requests */
#define XY_RSET_ALL  (struct xy_iorq *)(-2)   /* don't restart anything */