/*	$NetBSD: xdvar.h,v 1.13 2012/10/27 17:18:38 chs 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.
 *
 * 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 d v a r . h
 *
 * this file defines the software structure we use to control the
 * 753/7053.
 *
 * author: Chuck Cranor <chuck@netbsd>
 */

#include <sys/callout.h>

/*
 * i/o request: wrapper for hardware's iopb data structure
 */

struct xd_iorq {
	struct xd_iopb *iopb;		/* address of matching iopb */
	struct xd_iopb *dmaiopb;	/* DMA address of above */
	struct xdc_softc *xdc;		/* who we are working with */
	struct xd_softc *xd;		/* which disk */
	int ttl;			/* time to live */
	int mode;			/* current mode (state+other data) */
	int tries;			/* number of times we have tried it */
	int errnum;			/* 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 XD_SUB_MASK 0xf0            /* mask bits for state */
#define XD_SUB_FREE 0x00            /* free */
#define XD_SUB_NORM 0x10            /* normal I/O request */
#define XD_SUB_WAIT 0x20            /* normal I/O request in the
                                             context of a process */
#define XD_SUB_POLL 0x30            /* polled mode */
#define XD_SUB_DONE 0x40            /* not active, but can't be free'd yet */
#define XD_SUB_NOQ  0x50            /* don't queue, just submit (internal) */

#define XD_STATE(X) ((X) & XD_SUB_MASK) /* extract state from mode */
#define XD_NEWSTATE(OLD, NEW) (((OLD) & ~XD_SUB_MASK) |(NEW)) /* new state */


/*
 * other mode data
 */

#define XD_MODE_VERBO 0x08          /* print error messages */
#define XD_MODE_B144  0x04          /* handling a bad144 sector */


/*
 * software timers and flags
 */

#define XDC_SUBWAITLIM	4	/* max number of "done" IOPBs there can be
				   where we still allow a SUB_WAIT command */
#define XDC_TICKCNT	(5*hz)	/* call xdc_tick on this interval (5 sec) */
#define XDC_MAXTTL	2	/* max number of xd ticks to live */
#define XDC_NOUNIT	(-1)	/* for xdcmd: no unit number */

/*
 * a "xd_softc" structure contains per-disk state info.
 */

struct xd_softc {
	device_t sc_dev;		/* device struct, reqd by autoconf */
	struct disk sc_dk;		/* generic disk info */
	struct xdc_softc *parent;	/* parent */
	u_short flags;			/* flags */
	u_short state;			/* device state */
	int xd_drive;			/* unit number */
	/* 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 dkbad dkb;		/* bad144 sectors */
};

/*
 * flags
 */
#define XD_WLABEL 0x0001           /* write label */

/*
 * state
 */
#define XD_DRIVE_UNKNOWN 0         /* never talked to it */
#define XD_DRIVE_ATTACHING 1       /* attach in progress */
#define XD_DRIVE_NOLABEL 2         /* drive on-line, no label */
#define XD_DRIVE_ONLINE  3         /* drive is on-line */

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

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

	struct callout sc_tick_ch;

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

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

	struct xd_iorq *reqs;		/* i/o requests */
	struct xd_iopb *iopbase;	/* iopb base addr (maps iopb->iorq) */
	struct xd_iopb *dvmaiopb;	/* iopb base in DVMA space, not kvm */
	bus_dmamap_t iopmap;		/* IOPB DMA handle */
	bus_dmamap_t auxmap;		/* auxiliary DMA handle */
	struct bufq_state *sc_wq;	/* queued IOPBs for this controller */
	char freereq[XDC_MAXIOPB];	/* free list (stack) */
	char waitq[XDC_MAXIOPB];	/* wait queue */
	u_char nfree;			/* number of iopbs free */
	u_char nrun;			/* number running */
	u_char nwait;			/* number of waiting iopbs */
	u_char ndone;			/* number of done IORQs */
	u_char waithead;		/* head of queue */
	u_char waitend;			/* end of queue */
};

/*
 * reset blast modes
 */

#define XD_RSET_NONE (-1)          /* restart all requests */
#define XD_RSET_ALL  (-2)          /* don't restart anything */
