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Annotation of 43BSDReno/sys/hpstand/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 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:  *     @(#)dca.c       7.1 (Berkeley) 5/8/90
        !            26:  */
        !            27: 
        !            28: #ifdef DCACONSOLE
        !            29: #include "../sys/param.h"
        !            30: #include "../hpdev/dcareg.h"
        !            31: #include "machine/cpu.h"
        !            32: #include "machine/cons.h"
        !            33: 
        !            34: #define CONSDEV        (0)
        !            35: #define CONSOLE ((struct dcadevice *)(EXTIOBASE + (9 * IOCARDSIZE)))
        !            36: 
        !            37: dcaprobe(cp)
        !            38:        struct consdev *cp;
        !            39: {
        !            40:        register struct dcadevice *dca = CONSOLE;
        !            41: 
        !            42:        if (badaddr((char *)CONSOLE)) {
        !            43:                cp->cn_pri = CN_DEAD;
        !            44:                return;
        !            45:        }
        !            46:        switch (dca->dca_irid) {
        !            47:        case DCAID0:
        !            48:        case DCAID1:
        !            49:                cp->cn_pri = CN_NORMAL;
        !            50:                break;
        !            51:        case DCAREMID0:
        !            52:        case DCAREMID1:
        !            53:                cp->cn_pri = CN_REMOTE;
        !            54:                break;
        !            55:        default:
        !            56:                cp->cn_pri = CN_DEAD;
        !            57:                break;
        !            58:        }
        !            59: }
        !            60: 
        !            61: dcainit(cp)
        !            62:        struct consdev *cp;
        !            63: {
        !            64:        register struct dcadevice *dca = CONSOLE;
        !            65: 
        !            66:        dca->dca_irid = 0xFF;
        !            67:        DELAY(100);
        !            68:        dca->dca_ic = 0;
        !            69:        dca->dca_cfcr = CFCR_DLAB;
        !            70:        dca->dca_data = DCABRD(9600) & 0xFF;
        !            71:        dca->dca_ier = DCABRD(9600) >> 8;
        !            72:        dca->dca_cfcr = CFCR_8BITS;
        !            73: }
        !            74: 
        !            75: #ifndef SMALL
        !            76: dcagetchar()
        !            77: {
        !            78:        register struct dcadevice *dca = CONSOLE;
        !            79:        short stat;
        !            80:        int c;
        !            81: 
        !            82:        if (((stat = dca->dca_lsr) & LSR_RXRDY) == 0)
        !            83:                return(0);
        !            84:        c = dca->dca_data;
        !            85:        return(c);
        !            86: }
        !            87: #else
        !            88: dcagetchar()
        !            89: {
        !            90:        return(0);
        !            91: }
        !            92: #endif
        !            93: 
        !            94: dcaputchar(c)
        !            95:        register int c;
        !            96: {
        !            97:        register struct dcadevice *dca = CONSOLE;
        !            98:        register int timo;
        !            99:        short stat;
        !           100: 
        !           101:        /* wait a reasonable time for the transmitter to come ready */
        !           102:        timo = 50000;
        !           103:        while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
        !           104:                ;
        !           105:        dca->dca_data = c;
        !           106:        /* wait for this transmission to complete */
        !           107:        timo = 1000000;
        !           108:        while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
        !           109:                ;
        !           110: }
        !           111: #endif

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