104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* $NetBSD: scn.c,v 1.3 1995/08/29 21:55:49 phil Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1994 Philip L. Budne.
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Philip L. Budne.
|
|
* 4. The name of Philip L. Budne may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY PHILIP BUDNE ``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 PHILIP BUDNE 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.
|
|
*/
|
|
|
|
/*
|
|
* scn.c -- scn2681/2692/68881 standalone console driver
|
|
* Phil Budne, May 10, 1994
|
|
*
|
|
*/
|
|
|
|
#ifdef SCNCONSOLE
|
|
#include <sys/types.h>
|
|
#include <dev/cons.h>
|
|
|
|
#define DUART 0x28000000
|
|
|
|
/* registers */
|
|
#define SCN_STAT 1
|
|
#define SCN_DATA 3
|
|
|
|
/* status bits */
|
|
#define STAT_RXRDY 0x01
|
|
#define STAT_TXRDY 0x04
|
|
|
|
#ifndef SCNCNUNIT
|
|
#define SCNCNUNIT 0
|
|
#endif
|
|
|
|
unsigned char * volatile scncnaddr = (unsigned char *) DUART + 8 * SCNCNUNIT;
|
|
|
|
scnprobe(cp)
|
|
struct consdev *cp;
|
|
{
|
|
/* the only game in town */
|
|
cp->cn_pri = CN_NORMAL; /* XXX remote? */
|
|
}
|
|
|
|
scninit(cp)
|
|
struct consdev *cp;
|
|
{
|
|
/* leave things they way the PROM set them */
|
|
}
|
|
|
|
scngetchar(cp)
|
|
struct consdev *cp;
|
|
{
|
|
register unsigned char * volatile scn = scncnaddr;
|
|
|
|
if ((scn[SCN_STAT] & STAT_RXRDY) == 0)
|
|
return(0);
|
|
return scn[SCN_DATA];
|
|
}
|
|
|
|
scnputchar(cp, c)
|
|
struct consdev *cp;
|
|
register int c;
|
|
{
|
|
register unsigned char * volatile scn = scncnaddr;
|
|
register int timo;
|
|
short stat;
|
|
|
|
/* wait a reasonable time for the transmitter to come ready */
|
|
timo = 50000;
|
|
while (((stat = scn[SCN_STAT]) & STAT_TXRDY) == 0 && --timo)
|
|
;
|
|
scn[SCN_DATA] = c;
|
|
#if 0
|
|
/* wait for this transmission to complete */
|
|
timo = 1000000;
|
|
while (((stat = scn[SCN_STAT]) & STAT_TXRDY) == 0 && --timo)
|
|
;
|
|
#endif
|
|
}
|
|
#endif
|