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