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Annotation of Net2/arch/hp300/stand/dcm.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:  *     @(#)dcm.c       7.3 (Berkeley) 5/7/91
        !            39:  */
        !            40: 
        !            41: #ifdef DCMCONSOLE
        !            42: #include "sys/param.h"
        !            43: #include "../hp300/cons.h"
        !            44: #include "../dev/device.h"
        !            45: #include "../dev/dcmreg.h"
        !            46: 
        !            47: struct dcmdevice *dcmcnaddr = NULL;
        !            48: 
        !            49: dcmprobe(cp)
        !            50:        struct consdev *cp;
        !            51: {
        !            52:        extern struct hp_hw sc_table[];
        !            53:        register struct hp_hw *hw;
        !            54:        register struct dcmdevice *dcm;
        !            55: 
        !            56:        for (hw = sc_table; hw < &sc_table[MAXCTLRS]; hw++)
        !            57:                if (HW_ISDEV(hw, D_COMMDCM) && !badaddr((caddr_t)hw->hw_kva))
        !            58:                        break;
        !            59:        if (!HW_ISDEV(hw, D_COMMDCM)) {
        !            60:                cp->cn_pri = CN_DEAD;
        !            61:                return;
        !            62:        }
        !            63:        dcmcnaddr = (struct dcmdevice *) hw->hw_kva;
        !            64: 
        !            65:        dcm = dcmcnaddr;
        !            66:        switch (dcm->dcm_rsid) {
        !            67:        case DCMID:
        !            68:                cp->cn_pri = CN_NORMAL;
        !            69:                break;
        !            70:        case DCMID|DCMCON:
        !            71:                cp->cn_pri = CN_REMOTE;
        !            72:                break;
        !            73:        default:
        !            74:                cp->cn_pri = CN_DEAD;
        !            75:                break;
        !            76:        }
        !            77: }
        !            78: 
        !            79: dcminit(cp)
        !            80:        struct consdev *cp;
        !            81: {
        !            82:        register struct dcmdevice *dcm = dcmcnaddr;
        !            83:        register int port = CONUNIT;
        !            84: 
        !            85:        dcm->dcm_ic = IC_ID;
        !            86:        while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
        !            87:                ;
        !            88:        dcm->dcm_data[port].dcm_baud = BR_9600;
        !            89:        dcm->dcm_data[port].dcm_conf = LC_8BITS | LC_1STOP;
        !            90:        SEM_LOCK(dcm);
        !            91:        dcm->dcm_cmdtab[port].dcm_data |= CT_CON;
        !            92:        dcm->dcm_cr |= (1 << port);
        !            93:        SEM_UNLOCK(dcm);
        !            94:        DELAY(15000);
        !            95: }
        !            96: 
        !            97: #ifndef SMALL
        !            98: dcmgetchar()
        !            99: {
        !           100:        register struct dcmdevice *dcm = dcmcnaddr;
        !           101:        register struct dcmrfifo *fifo;
        !           102:        register struct dcmpreg *pp;
        !           103:        register unsigned head;
        !           104:        int c, stat, port;
        !           105: 
        !           106:        port = CONUNIT;
        !           107:        pp = dcm_preg(dcm, port);
        !           108:        head = pp->r_head & RX_MASK;
        !           109:        if (head == (pp->r_tail & RX_MASK))
        !           110:                return(0);
        !           111:        fifo = &dcm->dcm_rfifos[3-port][head>>1];
        !           112:        c = fifo->data_char;
        !           113:        stat = fifo->data_stat;
        !           114:        pp->r_head = (head + 2) & RX_MASK;
        !           115:        SEM_LOCK(dcm);
        !           116:        stat = dcm->dcm_iir;
        !           117:        SEM_UNLOCK(dcm);
        !           118:        return(c);
        !           119: }
        !           120: #else
        !           121: dcmgetchar()
        !           122: {
        !           123:        return(0);
        !           124: }
        !           125: #endif
        !           126: 
        !           127: dcmputchar(c)
        !           128:        register int c;
        !           129: {
        !           130:        register struct dcmdevice *dcm = dcmcnaddr;
        !           131:        register struct dcmpreg *pp;
        !           132:        register int timo;
        !           133:        unsigned tail;
        !           134:        int port, stat;
        !           135: 
        !           136:        port = CONUNIT;
        !           137:        pp = dcm_preg(dcm, port);
        !           138:        tail = pp->t_tail & TX_MASK;
        !           139:        timo = 50000;
        !           140:        while (tail != (pp->t_head & TX_MASK) && --timo)
        !           141:                ;
        !           142:        dcm->dcm_tfifos[3-port][tail].data_char = c;
        !           143:        pp->t_tail = tail = (tail + 1) & TX_MASK;
        !           144:        SEM_LOCK(dcm);
        !           145:        dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
        !           146:        dcm->dcm_cr |= (1 << port);
        !           147:        SEM_UNLOCK(dcm);
        !           148:        timo = 1000000;
        !           149:        while (tail != (pp->t_head & TX_MASK) && --timo)
        !           150:                ;
        !           151:        SEM_LOCK(dcm);
        !           152:        stat = dcm->dcm_iir;
        !           153:        SEM_UNLOCK(dcm);
        !           154: }
        !           155: #endif

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