/*      $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;
}

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