/*      $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