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      1 /*	$NetBSD: dcm.c,v 1.10 2023/04/21 22:44:27 tsutsui Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	@(#)dcm.c	8.1 (Berkeley) 6/10/93
     37  */
     38 
     39 #ifdef DCMCONSOLE
     40 #include <sys/param.h>
     41 #include <dev/cons.h>
     42 
     43 #include <hp300/dev/dcmreg.h>
     44 
     45 #include <hp300/stand/common/consdefs.h>
     46 #include <hp300/stand/common/samachdep.h>
     47 #include <hp300/stand/common/device.h>
     48 
     49 struct dcmdevice *dcmcnaddr = NULL;
     50 
     51 #define	DCMCONUNIT	1	/* XXX */
     52 
     53 void
     54 dcmprobe(struct consdev *cp)
     55 {
     56 	struct hp_hw *hw;
     57 	struct dcmdevice *dcm;
     58 
     59 	for (hw = sc_table; hw < &sc_table[MAXCTLRS]; hw++)
     60 		if (HW_ISDEV(hw, D_COMMDCM) && !badaddr((void *)hw->hw_kva))
     61 			break;
     62 	if (!HW_ISDEV(hw, D_COMMDCM)) {
     63 		cp->cn_pri = CN_DEAD;
     64 		return;
     65 	}
     66 	dcmcnaddr = (struct dcmdevice *) hw->hw_kva;
     67 
     68 #ifdef FORCEDCMCONSOLE
     69 	cp->cn_pri = CN_REMOTE;
     70 #else
     71 	dcm = dcmcnaddr;
     72 	switch (dcm->dcm_rsid) {
     73 	case DCMID:
     74 		cp->cn_pri = CN_NORMAL;
     75 		break;
     76 	case DCMID|DCMCON:
     77 		cp->cn_pri = CN_REMOTE;
     78 		break;
     79 	default:
     80 		cp->cn_pri = CN_DEAD;
     81 		break;
     82 	}
     83 
     84 	curcons_scode = hw->hw_sc;
     85 #endif
     86 }
     87 
     88 void
     89 dcminit(struct consdev *cp)
     90 {
     91 	struct dcmdevice *dcm = dcmcnaddr;
     92 	int port = DCMCONUNIT;
     93 
     94 	dcm->dcm_ic = IC_ID;
     95 	while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
     96 		;
     97 	dcm->dcm_data[port].dcm_baud = BR_9600;
     98 	dcm->dcm_data[port].dcm_conf = LC_8BITS | LC_1STOP;
     99 	SEM_LOCK(dcm);
    100 	dcm->dcm_cmdtab[port].dcm_data |= CT_CON;
    101 	dcm->dcm_cr |= (1 << port);
    102 	SEM_UNLOCK(dcm);
    103 	DELAY(15000);
    104 }
    105 
    106 #ifndef SMALL
    107 int
    108 dcmgetchar(dev_t dev)
    109 {
    110 	struct dcmdevice *dcm = dcmcnaddr;
    111 	struct dcmrfifo *fifo;
    112 	struct dcmpreg *pp;
    113 	unsigned int head;
    114 	int c, port;
    115 
    116 	port = DCMCONUNIT;
    117 	pp = dcm_preg(dcm, port);
    118 	head = pp->r_head & RX_MASK;
    119 	if (head == (pp->r_tail & RX_MASK))
    120 		return 0;
    121 	fifo = &dcm->dcm_rfifos[3-port][head>>1];
    122 	c = fifo->data_char;
    123 	(void)fifo->data_stat;
    124 	pp->r_head = (head + 2) & RX_MASK;
    125 	SEM_LOCK(dcm);
    126 	(void)dcm->dcm_iir;
    127 	SEM_UNLOCK(dcm);
    128 	return c;
    129 }
    130 #else
    131 int
    132 dcmgetchar(dev_t dev)
    133 {
    134 
    135 	return 0;
    136 }
    137 #endif
    138 
    139 void
    140 dcmputchar(dev_t dev, int c)
    141 {
    142 	struct dcmdevice *dcm = dcmcnaddr;
    143 	struct dcmpreg *pp;
    144 	int timo;
    145 	unsigned int tail;
    146 	int port;
    147 
    148 	port = DCMCONUNIT;
    149 	pp = dcm_preg(dcm, port);
    150 	tail = pp->t_tail & TX_MASK;
    151 	timo = 50000;
    152 	while (tail != (pp->t_head & TX_MASK) && --timo)
    153 		;
    154 	dcm->dcm_tfifos[3-port][tail].data_char = c;
    155 	pp->t_tail = tail = (tail + 1) & TX_MASK;
    156 	SEM_LOCK(dcm);
    157 	dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
    158 	dcm->dcm_cr |= (1 << port);
    159 	SEM_UNLOCK(dcm);
    160 	timo = 1000000;
    161 	while (tail != (pp->t_head & TX_MASK) && --timo)
    162 		;
    163 	SEM_LOCK(dcm);
    164 	(void)dcm->dcm_iir;
    165 	SEM_UNLOCK(dcm);
    166 }
    167 #endif
    168