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dca.c revision 1.6.100.1 
      1 /*	$NetBSD: dca.c,v 1.6.100.1 2011/03/05 20:50:25 rmind Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	@(#)dca.c	8.1 (Berkeley) 6/10/93
     37  */
     38 
     39 #ifdef DCACONSOLE
     40 #include <sys/param.h>
     41 #include <dev/cons.h>
     42 
     43 #include <hp300/stand/common/dcareg.h>
     44 #include <hp300/stand/common/consdefs.h>
     45 #include <hp300/stand/common/samachdep.h>
     46 
     47 /* If not using 4.4 devs */
     48 #ifndef dca_reset
     49 #define dca_id dca_irid
     50 #define dca_reset dca_id
     51 #endif
     52 
     53 struct dcadevice *dcacnaddr = 0;
     54 
     55 #define DCACONSCODE	9	/* XXX */
     56 
     57 void
     58 dcaprobe(struct consdev *cp)
     59 {
     60 	struct dcadevice *dca;
     61 
     62 	dcacnaddr = (struct dcadevice *) sctoaddr(DCACONSCODE);
     63 	if (badaddr((char *)dcacnaddr)) {
     64 		cp->cn_pri = CN_DEAD;
     65 		return;
     66 	}
     67 #ifdef FORCEDCACONSOLE
     68 	cp->cn_pri = CN_REMOTE;
     69 #else
     70 	dca = dcacnaddr;
     71 	switch (dca->dca_id) {
     72 	case DCAID0:
     73 	case DCAID1:
     74 		cp->cn_pri = CN_NORMAL;
     75 		break;
     76 	case DCAREMID0:
     77 	case DCAREMID1:
     78 		cp->cn_pri = CN_REMOTE;
     79 		break;
     80 	default:
     81 		cp->cn_pri = CN_DEAD;
     82 		break;
     83 	}
     84 
     85 #endif
     86 	curcons_scode = DCACONSCODE;
     87 }
     88 
     89 void
     90 dcainit(struct consdev *cp)
     91 {
     92 	struct dcadevice *dca = dcacnaddr;
     93 
     94 	dca->dca_reset = 0xFF;
     95 	DELAY(100);
     96 	dca->dca_ic = 0;
     97 	dca->dca_cfcr = CFCR_DLAB;
     98 	dca->dca_data = DCABRD(9600) & 0xFF;
     99 	dca->dca_ier = DCABRD(9600) >> 8;
    100 	dca->dca_cfcr = CFCR_8BITS;
    101 	dca->dca_fifo =
    102 	    FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1;
    103 	dca->dca_mcr = MCR_DTR | MCR_RTS;
    104 }
    105 
    106 /* ARGSUSED */
    107 #ifndef SMALL
    108 int
    109 dcagetchar(dev_t dev)
    110 {
    111 	struct dcadevice *dca = dcacnaddr;
    112 	short stat;
    113 	int c;
    114 
    115 	if (((stat = dca->dca_lsr) & LSR_RXRDY) == 0)
    116 		return 0;
    117 	c = dca->dca_data;
    118 	return c;
    119 }
    120 #else
    121 int
    122 dcagetchar(dev_t dev)
    123 {
    124 
    125 	return 0;
    126 }
    127 #endif
    128 
    129 /* ARGSUSED */
    130 void
    131 dcaputchar(dev_t dev, int c)
    132 {
    133 	struct dcadevice *dca = dcacnaddr;
    134 	int timo;
    135 	short stat;
    136 
    137 	/* wait a reasonable time for the transmitter to come ready */
    138 	timo = 50000;
    139 	while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
    140 		;
    141 	dca->dca_data = c;
    142 	/* wait for this transmission to complete */
    143 	timo = 1000000;
    144 	while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
    145 		;
    146 }
    147 #endif
    148