/*	$NetBSD: ct.c,v 1.7 2011/07/17 20:54:40 joerg Exp $	*/

/*
 * 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. 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	8.1 (Berkeley) 7/15/93
 */

/*
 * CS80 tape driver
 */
#include <sys/param.h>

#include <hp300/dev/ctreg.h>

#include <lib/libsa/stand.h>
#include <hp300/stand/common/conf.h>
#include <hp300/stand/common/hpibvar.h>
#include <hp300/stand/common/samachdep.h>

struct	ct_iocmd ct_ioc;
struct	ct_rscmd ct_rsc;
struct	ct_stat ct_stat;
struct	ct_ssmcmd ct_ssmc;

struct	ct_softc {
	int	sc_ctlr;
	int	sc_unit;
	char	sc_retry;
	char	sc_alive;
	short	sc_punit;
	int	sc_blkno;
} ct_softc[NHPIB][NCT];

#define	CTRETRY		5
#define	MTFSF		10
#define	MTREW		11

char ctio_buf[MAXBSIZE];

struct	ctinfo {
	short	hwid;
	short	punit;
} ctinfo[] = {
	{ CT7946ID,	1 },
	{ CT7912PID,	1 },
	{ CT7914PID,	1 },
	{ CT9144ID,	0 },
	{ CT9145ID,	0 },
};
int	nctinfo = sizeof(ctinfo) / sizeof(ctinfo[0]);

static int ctinit(int, int);
static int ctident(int, int);
static int cterror(int, int);

int
ctinit(int ctlr, int unit)
{
	struct ct_softc *rs = &ct_softc[ctlr][unit];
	uint8_t stat;

	if (hpibrecv(ctlr, unit, C_QSTAT, &stat, 1) != 1 || stat)
		return 0;
	if (ctident(ctlr, unit) < 0)
		return 0;
	memset(&ct_ssmc, 0, sizeof(ct_ssmc));
	ct_ssmc.unit = C_SUNIT(rs->sc_punit);
	ct_ssmc.cmd = C_SSM;
	ct_ssmc.fefm = FEF_MASK;
	ct_ssmc.refm = REF_MASK;
	ct_ssmc.aefm = AEF_MASK;
	ct_ssmc.iefm = IEF_MASK;
	hpibsend(ctlr, unit, C_CMD, (uint8_t *)&ct_ssmc, sizeof(ct_ssmc));
	hpibswait(ctlr, unit);
	hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
	rs->sc_alive = 1;
	return 1;
}

int
ctident(int ctlr, int unit)
{
	struct ct_describe desc;
	uint8_t stat, cmd[3];
	char name[7];
	int id, i;

	id = hpibid(ctlr, unit);
	if ((id & 0x200) == 0)
		return -1;
	for (i = 0; i < nctinfo; i++)
		if (id == ctinfo[i].hwid)
			break;
	if (i == nctinfo)
		return -1;
	ct_softc[ctlr][unit].sc_punit = ctinfo[i].punit;
	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(ctlr, unit, C_CMD, cmd, sizeof(cmd));
	hpibrecv(ctlr, unit, C_EXEC, (uint8_t *)&desc, 37);
	hpibrecv(ctlr, unit, C_QSTAT, &stat, sizeof(stat));
	memset(name, 0, sizeof(name));
	if (!stat) {
		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 (memcmp(name, "079450", 6) == 0)
			id = -1;		/* not really a 7946 */
		break;
	default:
		break;
	}
	return id;
}

int
ctpunit(int ctlr, int slave, int *punit)
{
	struct ct_softc *rs;

	if (ctlr >= NHPIB || hpibalive(ctlr) == 0)
		return EADAPT;
	if (slave >= NCT)
		return ECTLR;
	rs = &ct_softc[ctlr][slave];

	if (rs->sc_alive == 0)
		return ENXIO;

	*punit = rs->sc_punit;
	return 0;
}

int
ctopen(struct open_file *f, ...)
{
	va_list ap;
	int ctlr, unit, part;
	struct ct_softc *rs;
	int skip;
	size_t resid;

	va_start(ap, f);
	ctlr = va_arg(ap, int);
	unit = va_arg(ap, int);
	part = va_arg(ap, int);
	va_end(ap);

	if (ctlr >= NHPIB || hpibalive(ctlr) == 0)
		return EADAPT;
	if (unit >= NCT)
		return ECTLR;
	rs = &ct_softc[ctlr][unit];
	rs->sc_blkno = 0;
	rs->sc_unit = unit;
	rs->sc_ctlr = ctlr;
	if (rs->sc_alive == 0)
		if (ctinit(ctlr, unit) == 0)
			return ENXIO;
	f->f_devdata = (void *)rs;
	ctstrategy(f->f_devdata, MTREW, 0, 0, ctio_buf, &resid);
	skip = part;
	while (skip--)
		ctstrategy(f->f_devdata, MTFSF, 0, 0, ctio_buf, &resid);
	return 0;
}

int
ctclose(struct open_file *f)
{
	size_t resid;

	ctstrategy(f->f_devdata, MTREW, 0, 0, ctio_buf, &resid);
	return 0;
}

int
ctstrategy(void *devdata, int func, daddr_t dblk, size_t size, void *v_buf,
    size_t *rsize)
{
	struct ct_softc *rs = devdata;
	uint8_t *buf = v_buf;
	int ctlr = rs->sc_ctlr;
	int unit = rs->sc_unit;
	uint8_t stat;

	if (size == 0 && (func == F_READ || func == F_WRITE))
		return 0;

	rs->sc_retry = 0;
	memset(&ct_ioc, 0, sizeof(ct_ioc));
	ct_ioc.unit = C_SUNIT(rs->sc_punit);
	ct_ioc.saddr = C_SADDR;
	ct_ioc.nop2 = C_NOP;
	ct_ioc.slen = C_SLEN;
	ct_ioc.nop3 = C_NOP;
top:
	if (func == F_READ) {
		ct_ioc.cmd = C_READ;
		ct_ioc.addr = rs->sc_blkno;
		ct_ioc.len = size;
	}
	else if (func == F_WRITE) {
		ct_ioc.cmd = C_WRITE;
		ct_ioc.addr = rs->sc_blkno;
		ct_ioc.len = size;
	}
	else if (func == MTFSF) {
		ct_ioc.cmd = C_READ;
		ct_ioc.addr = rs->sc_blkno;
		ct_ioc.len = size = MAXBSIZE;
	}
	else {
		ct_ioc.cmd = C_READ;
		ct_ioc.addr = 0;
		ct_ioc.len = 0;
		rs->sc_blkno = 0;
		size = 0;
	}
retry:
	hpibsend(ctlr, unit, C_CMD, (uint8_t *)&ct_ioc, sizeof(ct_ioc));
	if (func != MTREW) {
		hpibswait(ctlr, unit);
		hpibgo(ctlr, unit, C_EXEC, buf, size,
			func != F_WRITE ? F_READ : F_WRITE);
		hpibswait(ctlr, unit);
	} else {
		while (hpibswait(ctlr, unit) < 0)
			;
	}
	hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
	if (stat) {
		stat = cterror(ctlr, unit);
		if (stat == 0)
			return -1;
		if (stat == 2)
			return 0;
		if (++rs->sc_retry > CTRETRY)
			return -1;
		goto retry;
	}
	rs->sc_blkno += CTBTOK(size);
	if (func == MTFSF)
		goto top;
	*rsize = size;

	return 0;
}

int
cterror(int ctlr, int unit)
{
	struct ct_softc *rs = &ct_softc[ctlr][unit];
	uint8_t stat;

	memset(&ct_rsc, 0, sizeof(ct_rsc));
	memset(&ct_stat, 0, sizeof(ct_stat));
	ct_rsc.unit = C_SUNIT(rs->sc_punit);
	ct_rsc.cmd = C_STATUS;
	hpibsend(ctlr, unit, C_CMD, (uint8_t *)&ct_rsc, sizeof(ct_rsc));
	hpibrecv(ctlr, unit, C_EXEC, (uint8_t *)&ct_stat, sizeof(ct_stat));
	hpibrecv(ctlr, unit, C_QSTAT, &stat, 1);
	if (stat) {
		printf("ct%d: request status fail %d\n", unit, stat);
		return 0;
	}
	if (ct_stat.c_aef & AEF_EOF) {
		/* 9145 drives don't increment block number at EOF */
		if ((ct_stat.c_blk - rs->sc_blkno) == 0)
			rs->sc_blkno++;
		else
			rs->sc_blkno = ct_stat.c_blk;
		return 2;
	}
	printf("ct%d err: vu 0x%x, pend 0x%x, bn%ld", unit,
	    ct_stat.c_vu, ct_stat.c_pend, ct_stat.c_blk);
	printf(", R 0x%x F 0x%x A 0x%x I 0x%x\n", ct_stat.c_ref,
	    ct_stat.c_fef, ct_stat.c_aef, ct_stat.c_ief);
	return 1;
}