/*      $NetBSD: dcm.c,v 1.10 2023/04/21 22:44:27 tsutsui Exp $ */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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.
 *
 *      @(#)dcm.c       8.1 (Berkeley) 6/10/93
 */

#ifdef DCMCONSOLE
#include <sys/param.h>
#include <dev/cons.h>

#include <hp300/dev/dcmreg.h>

#include <hp300/stand/common/consdefs.h>
#include <hp300/stand/common/samachdep.h>
#include <hp300/stand/common/device.h>

struct dcmdevice *dcmcnaddr = NULL;

#define DCMCONUNIT      1       /* XXX */

void
dcmprobe(struct consdev *cp)
{
        struct hp_hw *hw;
        struct dcmdevice *dcm;

        for (hw = sc_table; hw < &sc_table[MAXCTLRS]; hw++)
                if (HW_ISDEV(hw, D_COMMDCM) && !badaddr((void *)hw->hw_kva))
                        break;
        if (!HW_ISDEV(hw, D_COMMDCM)) {
                cp->cn_pri = CN_DEAD;
                return;
        }
        dcmcnaddr = (struct dcmdevice *) hw->hw_kva;

#ifdef FORCEDCMCONSOLE
        cp->cn_pri = CN_REMOTE;
#else
        dcm = dcmcnaddr;
        switch (dcm->dcm_rsid) {
        case DCMID:
                cp->cn_pri = CN_NORMAL;
                break;
        case DCMID|DCMCON:
                cp->cn_pri = CN_REMOTE;
                break;
        default:
                cp->cn_pri = CN_DEAD;
                break;
        }

        curcons_scode = hw->hw_sc;
#endif
}

void
dcminit(struct consdev *cp)
{
        struct dcmdevice *dcm = dcmcnaddr;
        int port = DCMCONUNIT;

        dcm->dcm_ic = IC_ID;
        while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
                ;
        dcm->dcm_data[port].dcm_baud = BR_9600;
        dcm->dcm_data[port].dcm_conf = LC_8BITS | LC_1STOP;
        SEM_LOCK(dcm);
        dcm->dcm_cmdtab[port].dcm_data |= CT_CON;
        dcm->dcm_cr |= (1 << port);
        SEM_UNLOCK(dcm);
        DELAY(15000);
}

#ifndef SMALL
int
dcmgetchar(dev_t dev)
{
        struct dcmdevice *dcm = dcmcnaddr;
        struct dcmrfifo *fifo;
        struct dcmpreg *pp;
        unsigned int head;
        int c, port;

        port = DCMCONUNIT;
        pp = dcm_preg(dcm, port);
        head = pp->r_head & RX_MASK;
        if (head == (pp->r_tail & RX_MASK))
                return 0;
        fifo = &dcm->dcm_rfifos[3-port][head>>1];
        c = fifo->data_char;
        (void)fifo->data_stat;
        pp->r_head = (head + 2) & RX_MASK;
        SEM_LOCK(dcm);
        (void)dcm->dcm_iir;
        SEM_UNLOCK(dcm);
        return c;
}
#else
int
dcmgetchar(dev_t dev)
{

        return 0;
}
#endif

void
dcmputchar(dev_t dev, int c)
{
        struct dcmdevice *dcm = dcmcnaddr;
        struct dcmpreg *pp;
        int timo;
        unsigned int tail;
        int port;

        port = DCMCONUNIT;
        pp = dcm_preg(dcm, port);
        tail = pp->t_tail & TX_MASK;
        timo = 50000;
        while (tail != (pp->t_head & TX_MASK) && --timo)
                ;
        dcm->dcm_tfifos[3-port][tail].data_char = c;
        pp->t_tail = tail = (tail + 1) & TX_MASK;
        SEM_LOCK(dcm);
        dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
        dcm->dcm_cr |= (1 << port);
        SEM_UNLOCK(dcm);
        timo = 1000000;
        while (tail != (pp->t_head & TX_MASK) && --timo)
                ;
        SEM_LOCK(dcm);
        (void)dcm->dcm_iir;
        SEM_UNLOCK(dcm);
}
#endif