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Annotation of sys/arch/hp300/stand/common/dca.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: dca.c,v 1.6 2006/08/17 06:31:10 miod Exp $    */
        !             2: /*     $NetBSD: dca.c,v 1.10 1996/10/06 01:42:48 mycroft Exp $ */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1988 University of Utah.
        !             6:  * Copyright (c) 1990, 1993
        !             7:  *     The Regents of the University of California.  All rights reserved.
        !             8:  *
        !             9:  * This code is derived from software contributed to Berkeley by
        !            10:  * the Systems Programming Group of the University of Utah Computer
        !            11:  * Science Department.
        !            12:  *
        !            13:  * Redistribution and use in source and binary forms, with or without
        !            14:  * modification, are permitted provided that the following conditions
        !            15:  * are met:
        !            16:  * 1. Redistributions of source code must retain the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer.
        !            18:  * 2. Redistributions in binary form must reproduce the above copyright
        !            19:  *    notice, this list of conditions and the following disclaimer in the
        !            20:  *    documentation and/or other materials provided with the distribution.
        !            21:  * 3. Neither the name of the University nor the names of its contributors
        !            22:  *    may be used to endorse or promote products derived from this software
        !            23:  *    without specific prior written permission.
        !            24:  *
        !            25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            35:  * SUCH DAMAGE.
        !            36:  *
        !            37:  *     @(#)dca.c       8.1 (Berkeley) 6/10/93
        !            38:  */
        !            39:
        !            40: #ifdef DCACONSOLE
        !            41: #include <sys/param.h>
        !            42:
        !            43: #include <hp300/dev/dcareg.h>
        !            44:
        !            45: #include "samachdep.h"
        !            46: #include "consdefs.h"
        !            47:
        !            48: struct dcadevice *dcacnaddr = 0;
        !            49:
        !            50: #define DCACONSCODE    9       /* XXX */
        !            51:
        !            52: void
        !            53: dcaprobe(struct consdev *cp)
        !            54: {
        !            55:        struct dcadevice *dca;
        !            56:
        !            57:        dcacnaddr = (struct dcadevice *) sctoaddr(DCACONSCODE);
        !            58:        if (badaddr((char *)dcacnaddr))
        !            59:                return;
        !            60:
        !            61:        dca = dcacnaddr;
        !            62:        switch (dca->dca_id) {
        !            63:        case DCAID0:
        !            64:        case DCAID1:
        !            65:                cp->cn_pri = CN_NORMAL;
        !            66:                break;
        !            67:        case DCAID0 | DCACON:
        !            68:        case DCAID1 | DCACON:
        !            69:                cp->cn_pri = CN_REMOTE;
        !            70:                break;
        !            71:        default:
        !            72:                break;
        !            73:        }
        !            74: }
        !            75:
        !            76: void
        !            77: dcainit(struct consdev *cp)
        !            78: {
        !            79:        struct dcadevice *dca = dcacnaddr;
        !            80:
        !            81:        dca->dca_reset = 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:        dca->dca_fifo =
        !            89:            FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1;
        !            90:        dca->dca_mcr = MCR_DTR | MCR_RTS;
        !            91: }
        !            92:
        !            93: /* ARGSUSED */
        !            94: int
        !            95: dcagetchar(dev_t dev)
        !            96: {
        !            97: #ifndef SMALL
        !            98:        struct dcadevice *dca = dcacnaddr;
        !            99:        short stat;
        !           100:        int c;
        !           101:
        !           102:        if (((stat = dca->dca_lsr) & LSR_RXRDY) == 0)
        !           103:                return(0);
        !           104:        c = dca->dca_data;
        !           105:        return(c);
        !           106: #else
        !           107:        return(0);
        !           108: #endif
        !           109: }
        !           110:
        !           111: /* ARGSUSED */
        !           112: void
        !           113: dcaputchar(dev_t dev, int c)
        !           114: {
        !           115:        struct dcadevice *dca = dcacnaddr;
        !           116:        int timo;
        !           117:        short stat;
        !           118:
        !           119:        /* wait a reasonable time for the transmitter to come ready */
        !           120:        timo = 50000;
        !           121:        while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
        !           122:                ;
        !           123:        dca->dca_data = c;
        !           124:        /* wait for this transmission to complete */
        !           125:        timo = 1000000;
        !           126:        while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
        !           127:                ;
        !           128: }
        !           129: #endif