1994-10-26 11:23:50 +03:00
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/* $NetBSD: scn.c,v 1.2 1994/10/26 08:25:52 cgd Exp $ */
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1994-05-30 23:58:42 +04:00
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/*-
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* Copyright (c) 1994 Philip L. Budne.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Philip L. Budne.
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* 4. The name of Philip L. Budne may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY PHILIP BUDNE ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL PHILIP BUDNE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* scn.c -- scn2681/2692/68881 standalone console driver
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* Phil Budne, May 10, 1994
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*
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*/
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#ifdef SCNCONSOLE
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#include <sys/types.h>
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#include <dev/cons.h>
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#define DUART 0x28000000
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/* registers */
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#define SCN_STAT 1
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#define SCN_DATA 3
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/* status bits */
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#define STAT_RXRDY 0x01
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#define STAT_TXRDY 0x04
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#ifndef SCNCNUNIT
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#define SCNCNUNIT 0
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#endif
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unsigned char * volatile scncnaddr = (unsigned char *) DUART + 8 * SCNCNUNIT;
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scnprobe(cp)
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struct consdev *cp;
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{
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/* the only game in town */
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cp->cn_pri = CN_NORMAL; /* XXX remote? */
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}
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scninit(cp)
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struct consdev *cp;
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{
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/* leave things they way the PROM set them */
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}
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scngetchar()
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{
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register unsigned char * volatile scn = scncnaddr;
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if ((scn[SCN_STAT] & STAT_RXRDY) == 0)
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return(0);
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return scn[SCN_DATA];
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}
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scnputchar(c)
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register int c;
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{
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register unsigned char * volatile scn = scncnaddr;
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register int timo;
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short stat;
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/* wait a reasonable time for the transmitter to come ready */
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timo = 50000;
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while (((stat = scn[SCN_STAT]) & STAT_TXRDY) == 0 && --timo)
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;
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scn[SCN_DATA] = c;
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#if 0
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/* wait for this transmission to complete */
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timo = 1000000;
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while (((stat = scn[SCN_STAT]) & STAT_TXRDY) == 0 && --timo)
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;
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#endif
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}
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#endif
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