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Annotation of Net2/arch/hp300/stand/dca.c, revision 1.1.1.2

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:  *
1.1.1.2 ! root       38:  *     from: @(#)dca.c 7.3 (Berkeley) 5/7/91
        !            39:  *     dca.c,v 1.2 1993/05/22 07:58:50 cgd Exp
1.1       root       40:  */
                     41: 
                     42: #ifdef DCACONSOLE
                     43: #include "sys/param.h"
                     44: #include "../dev/dcareg.h"
                     45: #include "../include/cpu.h"
                     46: #include "../hp300/cons.h"
                     47: 
                     48: struct dcadevice *dcacnaddr = 0;
                     49: 
                     50: dcaprobe(cp)
                     51:        struct consdev *cp;
                     52: {
                     53:        register struct dcadevice *dca;
                     54: 
                     55:        dcacnaddr = (struct dcadevice *) sctoaddr(CONSCODE);
                     56:        if (badaddr((char *)dcacnaddr)) {
                     57:                cp->cn_pri = CN_DEAD;
                     58:                return;
                     59:        }
                     60:        dca = dcacnaddr;
                     61:        switch (dca->dca_irid) {
                     62:        case DCAID0:
                     63:        case DCAID1:
                     64:                cp->cn_pri = CN_NORMAL;
                     65:                break;
                     66:        case DCAREMID0:
                     67:        case DCAREMID1:
                     68:                cp->cn_pri = CN_REMOTE;
                     69:                break;
                     70:        default:
                     71:                cp->cn_pri = CN_DEAD;
                     72:                break;
                     73:        }
                     74: }
                     75: 
                     76: dcainit(cp)
                     77:        struct consdev *cp;
                     78: {
                     79:        register struct dcadevice *dca = dcacnaddr;
                     80: 
                     81:        dca->dca_irid = 0xFF;
                     82:        DELAY(100);
                     83:        dca->dca_ic = 0;
                     84:        dca->dca_cfcr = CFCR_DLAB;
                     85:        dca->dca_data = DCABRD(9600) & 0xFF;
                     86:        dca->dca_ier = DCABRD(9600) >> 8;
                     87:        dca->dca_cfcr = CFCR_8BITS;
                     88: }
                     89: 
                     90: #ifndef SMALL
                     91: dcagetchar()
                     92: {
                     93:        register struct dcadevice *dca = dcacnaddr;
                     94:        short stat;
                     95:        int c;
                     96: 
                     97:        if (((stat = dca->dca_lsr) & LSR_RXRDY) == 0)
                     98:                return(0);
                     99:        c = dca->dca_data;
                    100:        return(c);
                    101: }
                    102: #else
                    103: dcagetchar()
                    104: {
                    105:        return(0);
                    106: }
                    107: #endif
                    108: 
                    109: dcaputchar(c)
                    110:        register int c;
                    111: {
                    112:        register struct dcadevice *dca = dcacnaddr;
                    113:        register int timo;
                    114:        short stat;
                    115: 
                    116:        /* wait a reasonable time for the transmitter to come ready */
                    117:        timo = 50000;
                    118:        while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
                    119:                ;
                    120:        dca->dca_data = c;
                    121:        /* wait for this transmission to complete */
                    122:        timo = 1000000;
                    123:        while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
                    124:                ;
                    125: }
                    126: #endif

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