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Annotation of sys/arch/hp300/stand/common/dca.c, Revision 1.1.1.1

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