/*	$NetBSD: console.c,v 1.7 2011/02/02 17:53:41 chuck Exp $	*/

/*
 * Copyright (c) 1995 Charles D. Cranor and Seth Widoff
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * console i/o
 */

#include "sboot.h"

/*
 * hardware
 */

struct zs_hw {
	volatile u_char ctl;
	volatile u_char data;
};

struct zs_hw *zs =  (struct zs_hw *)CONS_ZS_ADDR;

/*
 * consinit: init console
 */

void
consinit(void)
{
	int mark = time();
	int rr1;
	for (;;) {
		if (time() > mark + 5) break;
		zs->ctl = 1; rr1 = zs->ctl;
		zs->ctl = 0;
		if ((rr1 & 0x1) == 1 && (zs->ctl & 0x4) == 4)
			break; /* zs_drain! */
	}
	zs->ctl =  9;
	zs->ctl = 0x00; /* clear interrupt */
	zs->ctl =  4;
	zs->ctl = 0x44; /* 16x clk, 1 stop bit */
	zs->ctl =  5;
	zs->ctl = 0xea; /* DTR on, 8 bit xmit, xmit on, RTS on */
	zs->ctl =  3;
	zs->ctl = 0xc1; /* 8 bit recv, auto cd_cts, recv on */
	zs->ctl =  1;
	zs->ctl = 0x00; /* no intrs */
	zs->ctl =  2;
	zs->ctl = 0x00; /* no vector */
	zs->ctl = 10;
	zs->ctl = 0x00; /* */
	zs->ctl = 11;
	zs->ctl = 0x50; /* clocking options */
	zs->ctl = 12;
	zs->ctl = 0x0e; /* 9600 baud, part 1 */
	zs->ctl = 13;
	zs->ctl = 0x00; /* 9600 baud, part 2 */
	zs->ctl = 14;
	zs->ctl = 0x03; /* more clocking options */
	zs->ctl = 15;
	zs->ctl = 0x00; /* clear intrs */
}

/*
 * putchar: put char to console
 */

void putchar(int c) 
{
	if (c == '\n')
		putchar('\r');	/* avoid the need for \r\n in printf */
	zs->ctl = 0;
	while ((zs->ctl & 0x04) == 0) {
		zs->ctl = 0;
	}
	zs->ctl = 8;
	zs->ctl = (char)c;
}

/*
 * cngetc: get 1 char from console
 */

char cngetc(void) 
{

	zs->ctl = 0;
	while ((zs->ctl & 0x1) == 0) {
		zs->ctl = 0;
	}
	zs->ctl = 8;
	return zs->ctl;
}

/*
 * puts: put string to console
 */

void
puts(char *str)
{

	while (*str != '\0') {
		putchar(*str);
		str++;
	}
}

/*
 * ngets: get string from console 
 */

char *
ngets(char *str, int size)
{

	int i = 0;
	while ((i < size - 1) && (str[i] = cngetc()) != '\r') {
		if (str[i] == '\b' || str[i] == 0x7F) {
			if (i == 0)
				continue;
			i--;
			puts("\b \b");
			continue;
		}
		putchar(str[i]);
		i++;
	}
	puts("\n");
	str[i] = '\0';
	return &str[i];
}