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Annotation of Net2/arch/hp300/stand/dca.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 University of Utah.
                      3:  * Copyright (c) 1990 The Regents of the University of California.
                      4:  * All rights reserved.
                      5:  *
                      6:  * This code is derived from software contributed to Berkeley by
                      7:  * the Systems Programming Group of the University of Utah Computer
                      8:  * Science Department.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the University of
                     21:  *     California, Berkeley and its contributors.
                     22:  * 4. Neither the name of the University nor the names of its contributors
                     23:  *    may be used to endorse or promote products derived from this software
                     24:  *    without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     36:  * SUCH DAMAGE.
                     37:  *
                     38:  *     @(#)dca.c       7.3 (Berkeley) 5/7/91
                     39:  */
                     40: 
                     41: #ifdef DCACONSOLE
                     42: #include "sys/param.h"
                     43: #include "../dev/dcareg.h"
                     44: #include "../include/cpu.h"
                     45: #include "../hp300/cons.h"
                     46: 
                     47: struct dcadevice *dcacnaddr = 0;
                     48: 
                     49: dcaprobe(cp)
                     50:        struct consdev *cp;
                     51: {
                     52:        register struct dcadevice *dca;
                     53: 
                     54:        dcacnaddr = (struct dcadevice *) sctoaddr(CONSCODE);
                     55:        if (badaddr((char *)dcacnaddr)) {
                     56:                cp->cn_pri = CN_DEAD;
                     57:                return;
                     58:        }
                     59:        dca = dcacnaddr;
                     60:        switch (dca->dca_irid) {
                     61:        case DCAID0:
                     62:        case DCAID1:
                     63:                cp->cn_pri = CN_NORMAL;
                     64:                break;
                     65:        case DCAREMID0:
                     66:        case DCAREMID1:
                     67:                cp->cn_pri = CN_REMOTE;
                     68:                break;
                     69:        default:
                     70:                cp->cn_pri = CN_DEAD;
                     71:                break;
                     72:        }
                     73: }
                     74: 
                     75: dcainit(cp)
                     76:        struct consdev *cp;
                     77: {
                     78:        register struct dcadevice *dca = dcacnaddr;
                     79: 
                     80:        dca->dca_irid = 0xFF;
                     81:        DELAY(100);
                     82:        dca->dca_ic = 0;
                     83:        dca->dca_cfcr = CFCR_DLAB;
                     84:        dca->dca_data = DCABRD(9600) & 0xFF;
                     85:        dca->dca_ier = DCABRD(9600) >> 8;
                     86:        dca->dca_cfcr = CFCR_8BITS;
                     87: }
                     88: 
                     89: #ifndef SMALL
                     90: dcagetchar()
                     91: {
                     92:        register struct dcadevice *dca = dcacnaddr;
                     93:        short stat;
                     94:        int c;
                     95: 
                     96:        if (((stat = dca->dca_lsr) & LSR_RXRDY) == 0)
                     97:                return(0);
                     98:        c = dca->dca_data;
                     99:        return(c);
                    100: }
                    101: #else
                    102: dcagetchar()
                    103: {
                    104:        return(0);
                    105: }
                    106: #endif
                    107: 
                    108: dcaputchar(c)
                    109:        register int c;
                    110: {
                    111:        register struct dcadevice *dca = dcacnaddr;
                    112:        register int timo;
                    113:        short stat;
                    114: 
                    115:        /* wait a reasonable time for the transmitter to come ready */
                    116:        timo = 50000;
                    117:        while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
                    118:                ;
                    119:        dca->dca_data = c;
                    120:        /* wait for this transmission to complete */
                    121:        timo = 1000000;
                    122:        while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
                    123:                ;
                    124: }
                    125: #endif

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