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Annotation of 43BSDReno/sys/hpstand/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 is only permitted until one year after the first shipment
        !            11:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !            12:  * binary forms are permitted provided that: (1) source distributions retain
        !            13:  * this entire copyright notice and comment, and (2) distributions including
        !            14:  * binaries display the following acknowledgement:  This product includes
        !            15:  * software developed by the University of California, Berkeley and its
        !            16:  * contributors'' in the documentation or other materials provided with the
        !            17:  * distribution and in all advertising materials mentioning features or use
        !            18:  * of this software.  Neither the name of the University nor the names of
        !            19:  * its contributors may be used to endorse or promote products derived from
        !            20:  * this software without specific prior written permission.
        !            21:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            22:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            23:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            24:  *
        !            25:  *     @(#)dcm.c       7.1 (Berkeley) 5/25/90
        !            26:  */
        !            27: 
        !            28: #ifdef DCMCONSOLE
        !            29: #include "param.h"
        !            30: #include "machine/cons.h"
        !            31: #include "../hpdev/device.h"
        !            32: #include "../hpdev/dcmreg.h"
        !            33: 
        !            34: #define CONSPORT       (1)
        !            35: struct dcmdevice *CONSOLE = NULL;
        !            36: 
        !            37: dcmprobe(cp)
        !            38:        struct consdev *cp;
        !            39: {
        !            40:        extern struct hp_hw sc_table[];
        !            41:        register struct hp_hw *hw;
        !            42:        register struct dcmdevice *dcm;
        !            43: 
        !            44:        for (hw = sc_table; hw < &sc_table[MAX_CTLR]; hw++)
        !            45:                if (hw->hw_type == COMMDCM && !badaddr((caddr_t)hw->hw_addr))
        !            46:                        break;
        !            47:        if (hw->hw_type != COMMDCM) {
        !            48:                cp->cn_pri = CN_DEAD;
        !            49:                return;
        !            50:        }
        !            51:        CONSOLE = (struct dcmdevice *)hw->hw_addr;
        !            52: 
        !            53:        dcm = CONSOLE;
        !            54:        switch (dcm->dcm_rsid) {
        !            55:        case DCMID:
        !            56:                cp->cn_pri = CN_NORMAL;
        !            57:                break;
        !            58:        case DCMID|DCMCON:
        !            59:                cp->cn_pri = CN_REMOTE;
        !            60:                break;
        !            61:        default:
        !            62:                cp->cn_pri = CN_DEAD;
        !            63:                break;
        !            64:        }
        !            65: }
        !            66: 
        !            67: dcminit(cp)
        !            68:        struct consdev *cp;
        !            69: {
        !            70:        register struct dcmdevice *dcm = CONSOLE;
        !            71:        register int port = CONSPORT;
        !            72: 
        !            73:        dcm->dcm_ic = IC_ID;
        !            74:        while (dcm->dcm_thead[port].ptr != dcm->dcm_ttail[port].ptr)
        !            75:                ;
        !            76:        dcm->dcm_data[port].dcm_baud = BR_9600;
        !            77:        dcm->dcm_data[port].dcm_conf = LC_8BITS | LC_1STOP;
        !            78:        SEM_LOCK(dcm);
        !            79:        dcm->dcm_cmdtab[port].dcm_data |= CT_CON;
        !            80:        dcm->dcm_cr |= (1 << port);
        !            81:        SEM_UNLOCK(dcm);
        !            82:        DELAY(15000);
        !            83: }
        !            84: 
        !            85: #ifndef SMALL
        !            86: dcmgetchar()
        !            87: {
        !            88:        register struct dcmdevice *dcm = CONSOLE;
        !            89:        register struct dcmrfifo *fifo;
        !            90:        register struct dcmpreg *pp;
        !            91:        register unsigned head;
        !            92:        int c, stat, port;
        !            93: 
        !            94:        port = CONSPORT;
        !            95:        pp = dcm_preg(dcm, port);
        !            96:        head = pp->r_head & RX_MASK;
        !            97:        if (head == (pp->r_tail & RX_MASK))
        !            98:                return(0);
        !            99:        fifo = &dcm->dcm_rfifos[3-port][head>>1];
        !           100:        c = fifo->data_char;
        !           101:        stat = fifo->data_stat;
        !           102:        pp->r_head = (head + 2) & RX_MASK;
        !           103:        SEM_LOCK(dcm);
        !           104:        stat = dcm->dcm_iir;
        !           105:        SEM_UNLOCK(dcm);
        !           106:        return(c);
        !           107: }
        !           108: #else
        !           109: dcmgetchar()
        !           110: {
        !           111:        return(0);
        !           112: }
        !           113: #endif
        !           114: 
        !           115: dcmputchar(c)
        !           116:        register int c;
        !           117: {
        !           118:        register struct dcmdevice *dcm = CONSOLE;
        !           119:        register struct dcmpreg *pp;
        !           120:        register int timo;
        !           121:        unsigned tail;
        !           122:        int port, stat;
        !           123: 
        !           124:        port = CONSPORT;
        !           125:        pp = dcm_preg(dcm, port);
        !           126:        tail = pp->t_tail & TX_MASK;
        !           127:        timo = 50000;
        !           128:        while (tail != (pp->t_head & TX_MASK) && --timo)
        !           129:                ;
        !           130:        dcm->dcm_tfifos[3-port][tail].data_char = c;
        !           131:        pp->t_tail = tail = (tail + 1) & TX_MASK;
        !           132:        SEM_LOCK(dcm);
        !           133:        dcm->dcm_cmdtab[port].dcm_data |= CT_TX;
        !           134:        dcm->dcm_cr |= (1 << port);
        !           135:        SEM_UNLOCK(dcm);
        !           136:        timo = 1000000;
        !           137:        while (tail != (pp->t_head & TX_MASK) && --timo)
        !           138:                ;
        !           139:        SEM_LOCK(dcm);
        !           140:        stat = dcm->dcm_iir;
        !           141:        SEM_UNLOCK(dcm);
        !           142: }
        !           143: #endif

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