/*      $NetBSD: fhpib.c,v 1.6 2006/06/25 17:37:43 tsutsui 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.
 *
 *      @(#)fhpib.c     8.1 (Berkeley) 6/10/93
 */

/*
 * 98625A/B HPIB driver
 */

#include <sys/param.h>

#include <hp300/dev/fhpibreg.h>

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

static int fhpibwait(struct fhpibdevice *, uint8_t);

int
fhpibinit(int unit)
{
        struct hpib_softc *hs = &hpib_softc[unit];
        struct fhpibdevice *hd = (void *)hs->sc_addr;

        if (hd->hpib_cid != HPIBC)
                return 0;
        hs->sc_type = HPIBC;
        hs->sc_ba = HPIBC_BA;
        fhpibreset(unit);
        return 1;
}

void
fhpibreset(int unit)
{
        struct hpib_softc *hs = &hpib_softc[unit];
        struct fhpibdevice *hd;

        hd = (void *)hs->sc_addr;
        hd->hpib_cid = 0xFF;
        DELAY(100);
        hd->hpib_cmd = CT_8BIT;
        hd->hpib_ar = AR_ARONC;
        hd->hpib_cmd |= CT_IFC;
        hd->hpib_cmd |= CT_INITFIFO;
        DELAY(100);
        hd->hpib_cmd &= ~CT_IFC;
        hd->hpib_cmd |= CT_REN;
        hd->hpib_stat = ST_ATN;
        hd->hpib_data = C_DCL;
        DELAY(100000);
}

int
fhpibsend(int unit, int slave, int sec, uint8_t *buf, int cnt)
{
        struct hpib_softc *hs = &hpib_softc[unit];
        struct fhpibdevice *hd;
        int origcnt = cnt;

        hd = (void *)hs->sc_addr;
        hd->hpib_stat = 0;
        hd->hpib_imask = IM_IDLE | IM_ROOM;
        fhpibwait(hd, IM_IDLE);
        hd->hpib_stat = ST_ATN;
        hd->hpib_data = C_UNL;
        hd->hpib_data = C_TAG + hs->sc_ba;
        hd->hpib_data = C_LAG + slave;
        if (sec != -1)
                hd->hpib_data = C_SCG + sec;
        fhpibwait(hd, IM_IDLE);
        hd->hpib_stat = ST_WRITE;
        if (cnt) {
                while (--cnt) {
                        hd->hpib_data = *buf++;
                        if (fhpibwait(hd, IM_ROOM) < 0)
                                break;
                }
                hd->hpib_stat = ST_EOI;
                hd->hpib_data = *buf;
                if (fhpibwait(hd, IM_ROOM) < 0)
                        cnt++;
                hd->hpib_stat = ST_ATN;
                /* XXX: HP-UX claims bug with CS80 transparent messages */
                if (sec == 0x12)
                        DELAY(150);
                hd->hpib_data = C_UNL;
                fhpibwait(hd, IM_IDLE);
        }
        hd->hpib_imask = 0;
        return origcnt - cnt;
}

int
fhpibrecv(int unit, int slave, int sec, uint8_t *buf, int cnt)
{
        struct hpib_softc *hs = &hpib_softc[unit];
        struct fhpibdevice *hd;
        int origcnt = cnt;

        hd = (void *)hs->sc_addr;
        hd->hpib_stat = 0;
        hd->hpib_imask = IM_IDLE | IM_ROOM | IM_BYTE;
        fhpibwait(hd, IM_IDLE);
        hd->hpib_stat = ST_ATN;
        hd->hpib_data = C_UNL;
        hd->hpib_data = C_LAG + hs->sc_ba;
        hd->hpib_data = C_TAG + slave;
        if (sec != -1)
                hd->hpib_data = C_SCG + sec;
        fhpibwait(hd, IM_IDLE);
        hd->hpib_stat = ST_READ0;
        hd->hpib_data = 0;
        if (cnt) {
                while (--cnt >= 0) {
                        if (fhpibwait(hd, IM_BYTE) < 0)
                                break;
                        *buf++ = hd->hpib_data;
                }
                cnt++;
                fhpibwait(hd, IM_ROOM);
                hd->hpib_stat = ST_ATN;
                hd->hpib_data = (slave == 31) ? C_UNA : C_UNT;
                fhpibwait(hd, IM_IDLE);
        }
        hd->hpib_imask = 0;
        return origcnt - cnt;
}

int
fhpibppoll(int unit)
{
        struct hpib_softc *hs = &hpib_softc[unit];
        struct fhpibdevice *hd;
        int ppoll;

        hd = (void *)hs->sc_addr;
        hd->hpib_stat = 0;
        hd->hpib_psense = 0;
        hd->hpib_pmask = 0xFF;
        hd->hpib_imask = IM_PPRESP | IM_PABORT;
        DELAY(25);
        hd->hpib_intr = IM_PABORT;
        ppoll = hd->hpib_data;
        if (hd->hpib_intr & IM_PABORT)
                ppoll = 0;
        hd->hpib_imask = 0;
        hd->hpib_pmask = 0;
        hd->hpib_stat = ST_IENAB;
        return ppoll;
}

static int
fhpibwait(struct fhpibdevice *hd, uint8_t x)
{
        int timo = 100000;

        while ((hd->hpib_intr & x) == 0 && --timo)
                ;
        if (timo == 0)
                return -1;
        return 0;
}