ct.c

早期freebsd实现

/*
 * Copyright (c) 1982, 1990, 1993
 *	The Regents of the University of California.  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 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.
 *
 *	@(#)ct.c	8.2 (Berkeley) 1/12/94
 */

#include "ct.h"
#if NCT > 0
/*
 * CS80 cartridge tape driver (9144, 88140, 9145)
 *
 * Reminder:
 *	C_CC bit (character count option) when used in the CS/80 command
 *	'set options' will cause the tape not to stream.
 *
 * TODO:
 *	make filesystem compatible
 *	make block mode work according to mtio(4) spec. (if possible)
 *	merge with cs80 disk driver
 *	finish support of 9145
 */

#include <sys/param.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/tprintf.h>
#include <sys/proc.h>

#include <hp/dev/device.h>

#include <hp300/dev/ctreg.h>

/* number of eof marks to remember */
#define EOFS	128

int	ctinit(), ctstart(), ctgo(), ctintr();
struct	driver ctdriver = {
	ctinit, "ct", ctstart, ctgo, ctintr,
};

struct	ct_softc {
	struct	hp_device *sc_hd;
	struct	ct_iocmd sc_ioc;
	struct	ct_rscmd sc_rsc;
	struct	ct_stat sc_stat;
	struct	ct_ssmcmd sc_ssmc;
	struct	ct_srcmd sc_src;
	struct	ct_soptcmd sc_soptc;
	struct	ct_ulcmd sc_ul;
	struct	ct_wfmcmd sc_wfm;
	struct	ct_clearcmd sc_clear;
	struct	buf *sc_bp;
	int	sc_blkno;
	int	sc_cmd;
	int	sc_resid;
	char	*sc_addr;
	int	sc_flags;
	short	sc_type;
	short	sc_punit;
	tpr_t	sc_tpr;
	struct	devqueue sc_dq;
	int	sc_eofp;
	int	sc_eofs[EOFS];
} ct_softc[NCT];

/* flags */
#define	CTF_OPEN	0x01
#define	CTF_ALIVE	0x02
#define	CTF_WRT		0x04
#define	CTF_CMD		0x08
#define	CTF_IO		0x10
#define	CTF_BEOF	0x20
#define	CTF_AEOF	0x40
#define	CTF_EOT		0x80
#define	CTF_STATWAIT	0x100
#define CTF_CANSTREAM	0x200
#define	CTF_WRTTN	0x400

struct	ctinfo {
	short	hwid;
	short	punit;
	char	*desc;
} ctinfo[] = {
	CT7946ID,	1,	"7946A",
	CT7912PID,	1,	"7912P",
	CT7914PID,	1,	"7914P",
	CT9144ID,	0,	"9144",
	CT9145ID,	0,	"9145",
};
int	nctinfo = sizeof(ctinfo) / sizeof(ctinfo[0]);

struct	buf cttab[NCT];
struct	buf ctbuf[NCT];

#define	CT_NOREW	4
#define	CT_STREAM	8
#define	UNIT(x)		(minor(x) & 3)
#define	ctpunit(x)	((x) & 7)

#ifdef DEBUG
int ctdebug = 0;
#define CDB_FILES	0x01
#define CT_BSF		0x02
#endif

ctinit(hd)
	register struct hp_device *hd;
{
	register struct ct_softc *sc = &ct_softc[hd->hp_unit];
	register struct buf *bp;

	for (bp = cttab; bp < &cttab[NCT]; bp++)
		bp->b_actb = &bp->b_actf;
	sc->sc_hd = hd;
	sc->sc_punit = ctpunit(hd->hp_flags);
	if (ctident(sc, hd) < 0)
		return(0);
	ctreset(sc, hd);
	sc->sc_dq.dq_ctlr = hd->hp_ctlr;
	sc->sc_dq.dq_unit = hd->hp_unit;
	sc->sc_dq.dq_slave = hd->hp_slave;
	sc->sc_dq.dq_driver = &ctdriver;
	sc->sc_flags |= CTF_ALIVE;
	return(1);
}

ctident(sc, hd)
	register struct ct_softc *sc;
	register struct hp_device *hd;
{
	struct ct_describe desc;
	u_char stat, cmd[3];
	char name[7];
	int id, i;

	/*
	 * Read device id and verify that:
	 * 1. It is a CS80 device
	 * 2. It is one of our recognized tape devices
	 * 3. It has the proper physical unit number
	 */
	id = hpibid(hd->hp_ctlr, hd->hp_slave);
	if ((id & 0x200) == 0)
		return(-1);
	for (i = 0; i < nctinfo; i++)
		if (id == ctinfo[i].hwid)
			break;
	if (i == nctinfo || sc->sc_punit != ctinfo[i].punit)
		return(-1);
	id = i;

	/*
	 * Collect device description.
	 * Right now we only need this to differentiate 7945 from 7946.
	 * Note that we always issue the describe command to unit 0.
	 */
	cmd[0] = C_SUNIT(0);
	cmd[1] = C_SVOL(0);
	cmd[2] = C_DESC;
	hpibsend(hd->hp_ctlr, hd->hp_slave, C_CMD, cmd, sizeof(cmd));
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_EXEC, &desc, 37);
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_QSTAT, &stat, sizeof(stat));
	bzero(name, sizeof(name));
	if (!stat) {
		register int n = desc.d_name;
		for (i = 5; i >= 0; i--) {
			name[i] = (n & 0xf) + '0';
			n >>= 4;
		}
	}
	switch (ctinfo[id].hwid) {
	case CT7946ID:
		if (bcmp(name, "079450", 6) == 0)
			return(-1);		/* not really a 7946 */
		/* fall into... */
	case CT9144ID:
	case CT9145ID:
		sc->sc_type = CT9144;
		sc->sc_flags |= CTF_CANSTREAM;
		break;

	case CT7912PID:
	case CT7914PID:
		sc->sc_type = CT88140;
		break;
	}
	printf("ct%d: %s %stape\n", hd->hp_unit, ctinfo[id].desc,
	       (sc->sc_flags & CTF_CANSTREAM) ? "streaming " : " ");
	return(id);
}

ctreset(sc, hd)
	register struct ct_softc *sc;
	register struct hp_device *hd;
{
	u_char stat;

	sc->sc_clear.unit = C_SUNIT(sc->sc_punit);
	sc->sc_clear.cmd = C_CLEAR;
	hpibsend(hd->hp_ctlr, hd->hp_slave, C_TCMD, &sc->sc_clear,
		sizeof(sc->sc_clear));
	hpibswait(hd->hp_ctlr, hd->hp_slave);
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_QSTAT, &stat, sizeof(stat));
	sc->sc_src.unit = C_SUNIT(CTCTLR);
	sc->sc_src.nop = C_NOP;
	sc->sc_src.cmd = C_SREL;
	sc->sc_src.param = C_REL;
	hpibsend(hd->hp_ctlr, hd->hp_slave, C_CMD, &sc->sc_src,
		sizeof(sc->sc_src));
	hpibswait(hd->hp_ctlr, hd->hp_slave);
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_QSTAT, &stat, sizeof(stat));
	sc->sc_ssmc.unit = C_SUNIT(sc->sc_punit);
	sc->sc_ssmc.cmd = C_SSM;
	sc->sc_ssmc.refm = REF_MASK;
	sc->sc_ssmc.fefm = FEF_MASK;
	sc->sc_ssmc.aefm = AEF_MASK;
	sc->sc_ssmc.iefm = IEF_MASK;
	hpibsend(hd->hp_ctlr, hd->hp_slave, C_CMD, &sc->sc_ssmc,
		sizeof(sc->sc_ssmc));
	hpibswait(hd->hp_ctlr, hd->hp_slave);
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_QSTAT, &stat, sizeof(stat));
	sc->sc_soptc.unit = C_SUNIT(sc->sc_punit);
	sc->sc_soptc.nop = C_NOP;
	sc->sc_soptc.cmd = C_SOPT;
	sc->sc_soptc.opt = C_SPAR;
	hpibsend(hd->hp_ctlr, hd->hp_slave, C_CMD, &sc->sc_soptc,
		sizeof(sc->sc_soptc));
	hpibswait(hd->hp_ctlr, hd->hp_slave);
	hpibrecv(hd->hp_ctlr, hd->hp_slave, C_QSTAT, &stat, sizeof(stat));
}

/*ARGSUSED*/
ctopen(dev, flag, type, p)
	dev_t dev;
	int flag, type;
	struct proc *p;
{
	register struct ct_softc *sc = &ct_softc[UNIT(dev)];
	u_char stat;
	int cc;

	if (UNIT(dev) >= NCT || (sc->sc_flags & CTF_ALIVE) == 0)
		return(ENXIO);
	if (sc->sc_flags & CTF_OPEN)
		return(EBUSY);
	sc->sc_soptc.unit = C_SUNIT(sc->sc_punit);
	sc->sc_soptc.nop = C_NOP;
	sc->sc_soptc.cmd = C_SOPT;
	if ((dev & CT_STREAM) && (sc->sc_flags & CTF_CANSTREAM))
		sc->sc_soptc.opt = C_SPAR | C_IMRPT;
	else
		sc->sc_soptc.opt = C_SPAR;
	/* 
	 * Check the return of hpibsend() and hpibswait().
	 * Drive could be loading/unloading a tape. If not checked,
	 * driver hangs. 
	 */
	cc = hpibsend(sc->sc_hd->hp_ctlr, sc->sc_hd->hp_slave,
	              C_CMD, &sc->sc_soptc, sizeof(sc->sc_soptc));
	if (cc != sizeof(sc->sc_soptc))
		return(EBUSY);
	hpibswait(sc->sc_hd->hp_ctlr, sc->sc_hd->hp_slave);
	cc = hpibrecv(sc->sc_hd->hp_ctlr, sc->sc_hd->hp_slave, C_QSTAT, 
	              &stat, sizeof(stat));
	if (cc != sizeof(stat))
		return(EBUSY);
	sc->sc_tpr = tprintf_open(p);
	sc->sc_flags |= CTF_OPEN;
	return(0);
}

/*ARGSUSED*/
ctclose(dev, flag)
	dev_t dev;
	int flag;
{
	register struct ct_softc *sc = &ct_softc[UNIT(dev)];

	if ((sc->sc_flags & (CTF_WRT|CTF_WRTTN)) == (CTF_WRT|CTF_WRTTN) &&
	    (sc->sc_flags & CTF_EOT) == 0 ) { /* XXX return error if EOT ?? */
		ctcommand(dev, MTWEOF, 2);
		ctcommand(dev, MTBSR, 1);
		if (sc->sc_eofp == EOFS - 1)
			sc->sc_eofs[EOFS - 1]--;
		else
			sc->sc_eofp--;
#ifdef DEBUG
		if(ctdebug & CT_BSF)
			printf("ct%d: ctclose backup eofs prt %d blk %d\n",
			       UNIT(dev), sc->sc_eofp, sc->sc_eofs[sc->sc_eofp]);
#endif
	}
	if ((minor(dev) & CT_NOREW) == 0)
		ctcommand(dev, MTREW, 1);
	sc->sc_flags &= ~(CTF_OPEN | CTF_WRT | CTF_WRTTN);
	tprintf_close(sc->sc_tpr);
#ifdef DEBUG
	if (ctdebug & CDB_FILES)
		printf("ctclose: flags %x\n", sc->sc_flags);
#endif
	return(0);	/* XXX */
}

ctcommand(dev, cmd, cnt)
	dev_t dev;
	int cmd;
	register int cnt;
{
	register struct ct_softc *sc = &ct_softc[UNIT(dev)];
	register struct buf *bp = &ctbuf[UNIT(dev)];
	register struct buf *nbp = 0;

	if (cmd == MTBSF && sc->sc_eofp == EOFS - 1) {
		cnt = sc->sc_eofs[EOFS - 1] - cnt;
		ctcommand(dev, MTREW, 1);
		ctcommand(dev, MTFSF, cnt);
		cnt = 2;
		cmd = MTBSR;
	}

	if (cmd == MTBSF && sc->sc_eofp - cnt < 0) {
		cnt = 1;
		cmd = MTREW;
	}

	sc->sc_flags |= CTF_CMD;
	sc->sc_bp = bp;
	sc->sc_cmd = cmd;
	bp->b_dev = dev;
	if (cmd == MTFSF) {
		nbp = (struct buf *)geteblk(MAXBSIZE);
		bp->b_un.b_addr = nbp->b_un.b_addr;
		bp->b_bcount = MAXBSIZE;
	}
again:
	bp->b_flags = B_BUSY;
	if (cmd == MTBSF) {
		sc->sc_blkno = sc->sc_eofs[sc->sc_eofp];
		sc->sc_eofp--;
#ifdef DEBUG
		if (ctdebug & CT_BSF)
			printf("ct%d: backup eof pos %d blk %d\n",
			       UNIT(dev), sc->sc_eofp, 
			       sc->sc_eofs[sc->sc_eofp]);
#endif
	}
	ctstrategy(bp);
	iowait(bp);
	if (--cnt > 0)
		goto again;
	bp->b_flags = 0;
	sc->sc_flags &= ~CTF_CMD;
	if (nbp)
		brelse(nbp);
}

ctstrategy(bp)
	register struct buf *bp;
{
	register struct buf *dp;
	register int s, unit;

	unit = UNIT(bp->b_dev);
	dp = &cttab[unit];
	bp->b_actf = NULL;
	s = splbio();
	bp->b_actb = dp->b_actb;
	*dp->b_actb = bp;
	dp->b_actb = &bp->b_actf;
	if (dp->b_active == 0) {
		dp->b_active = 1;
		ctustart(unit);
	}
	splx(s);
}

ctustart(unit)
	register int unit;
{
	register struct ct_softc *sc = &ct_softc[unit];
	register struct buf *bp;

	bp = cttab[unit].b_actf;
	sc->sc_addr = bp->b_un.b_addr;
	sc->sc_resid = bp->b_bcount;
	if (hpibreq(&sc->sc_dq))
		ctstart(unit);
}

ctstart(unit)
	register int unit;
{
	register struct ct_softc *sc = &ct_softc[unit];
	register struct buf *bp, *dp;
	register int i;

	bp = cttab[unit].b_actf;
again:
	if ((sc->sc_flags & CTF_CMD) && sc->sc_bp == bp) {
		switch(sc->sc_cmd) {

		case MTFSF:
			bp->b_flags |= B_READ;
			goto mustio;