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console.c revision 1.6 
      1 /*	$NetBSD: console.c,v 1.6 2008/01/12 09:54:33 tsutsui Exp $	*/
      2 
      3 /*
      4  *
      5  * Copyright (c) 1995 Charles D. Cranor and Seth Widoff
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *      This product includes software developed by Charles D. Cranor
     19  *	and Seth Widoff.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 /*
     35  * console i/o
     36  */
     37 
     38 #include "sboot.h"
     39 
     40 /*
     41  * hardware
     42  */
     43 
     44 struct zs_hw {
     45 	volatile u_char ctl;
     46 	volatile u_char data;
     47 };
     48 
     49 struct zs_hw *zs =  (struct zs_hw *)CONS_ZS_ADDR;
     50 
     51 /*
     52  * consinit: init console
     53  */
     54 
     55 void
     56 consinit(void)
     57 {
     58 	int mark = time();
     59 	int rr1;
     60 	for (;;) {
     61 		if (time() > mark + 5) break;
     62 		zs->ctl = 1; rr1 = zs->ctl;
     63 		zs->ctl = 0;
     64 		if ((rr1 & 0x1) == 1 && (zs->ctl & 0x4) == 4)
     65 			break; /* zs_drain! */
     66 	}
     67 	zs->ctl =  9;
     68 	zs->ctl = 0x00; /* clear interrupt */
     69 	zs->ctl =  4;
     70 	zs->ctl = 0x44; /* 16x clk, 1 stop bit */
     71 	zs->ctl =  5;
     72 	zs->ctl = 0xea; /* DTR on, 8 bit xmit, xmit on, RTS on */
     73 	zs->ctl =  3;
     74 	zs->ctl = 0xc1; /* 8 bit recv, auto cd_cts, recv on */
     75 	zs->ctl =  1;
     76 	zs->ctl = 0x00; /* no intrs */
     77 	zs->ctl =  2;
     78 	zs->ctl = 0x00; /* no vector */
     79 	zs->ctl = 10;
     80 	zs->ctl = 0x00; /* */
     81 	zs->ctl = 11;
     82 	zs->ctl = 0x50; /* clocking options */
     83 	zs->ctl = 12;
     84 	zs->ctl = 0x0e; /* 9600 baud, part 1 */
     85 	zs->ctl = 13;
     86 	zs->ctl = 0x00; /* 9600 baud, part 2 */
     87 	zs->ctl = 14;
     88 	zs->ctl = 0x03; /* more clocking options */
     89 	zs->ctl = 15;
     90 	zs->ctl = 0x00; /* clear intrs */
     91 }
     92 
     93 /*
     94  * putchar: put char to console
     95  */
     96 
     97 void putchar(int c)
     98 {
     99 	if (c == '\n')
    100 		putchar('\r');	/* avoid the need for \r\n in printf */
    101 	zs->ctl = 0;
    102 	while ((zs->ctl & 0x04) == 0) {
    103 		zs->ctl = 0;
    104 	}
    105 	zs->ctl = 8;
    106 	zs->ctl = (char)c;
    107 }
    108 
    109 /*
    110  * cngetc: get 1 char from console
    111  */
    112 
    113 char cngetc(void)
    114 {
    115 
    116 	zs->ctl = 0;
    117 	while ((zs->ctl & 0x1) == 0) {
    118 		zs->ctl = 0;
    119 	}
    120 	zs->ctl = 8;
    121 	return zs->ctl;
    122 }
    123 
    124 /*
    125  * puts: put string to console
    126  */
    127 
    128 void
    129 puts(char *str)
    130 {
    131 
    132 	while (*str != '\0') {
    133 		putchar(*str);
    134 		str++;
    135 	}
    136 }
    137 
    138 /*
    139  * ngets: get string from console
    140  */
    141 
    142 char *
    143 ngets(char *str, int size)
    144 {
    145 
    146 	int i = 0;
    147 	while ((i < size - 1) && (str[i] = cngetc()) != '\r') {
    148 		if (str[i] == '\b' || str[i] == 0x7F) {
    149 			if (i == 0)
    150 				continue;
    151 			i--;
    152 			puts("\b \b");
    153 			continue;
    154 		}
    155 		putchar(str[i]);
    156 		i++;
    157 	}
    158 	puts("\n");
    159 	str[i] = '\0';
    160 	return &str[i];
    161 }
    162