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Commit	Line	Data
	1	/*-
	2	* Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	14	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	16	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	17	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	18	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	19	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	20	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	21	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	22	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	23	* SUCH DAMAGE.
	24	*
	25	* $FreeBSD: src/sys/boot/i386/libi386/comconsole.c,v 1.10 2003/09/16 11:24:23 bde Exp $
	26	* $DragonFly: src/sys/boot/pc32/libi386/comconsole.c,v 1.3 2003/11/10 06:08:36 dillon Exp $
	27	*/
	28
	29	#include <stand.h>
	30	#include <bootstrap.h>
	31	#include <machine/cpufunc.h>
	32	#include <dev/serial/ic_layer/ns16550.h>
	33	#include "libi386.h"
	34
	35	#define COMC_FMT 0x3 /* 8N1 */
	36	#define COMC_TXWAIT 0x40000 /* transmit timeout */
	37	#define COMC_BPS(x) (115200 / (x)) /* speed to DLAB divisor */
	38
	39	#ifndef COMPORT
	40	#define COMPORT 0x3f8
	41	#endif
	42	#ifndef COMSPEED
	43	#define COMSPEED 9600
	44	#endif
	45
	46	static void comc_probe(struct console *cp);
	47	static int comc_init(int arg);
	48	static void comc_putchar(int c);
	49	static int comc_getchar(void);
	50	static int comc_ischar(void);
	51
	52	static int comc_started;
	53
	54	struct console comconsole = {
	55	"comconsole",
	56	"serial port",
	57	0,
	58	comc_probe,
	59	comc_init,
	60	comc_putchar,
	61	comc_getchar,
	62	comc_ischar
	63	};
	64
	65	static void
	66	comc_probe(struct console *cp)
	67	{
	68	/* XXX check the BIOS equipment list? */
	69	cp->c_flags \|= (C_PRESENTIN \| C_PRESENTOUT);
	70	}
	71
	72	static int
	73	comc_init(int arg)
	74	{
	75	if (comc_started && arg == 0)
	76	return 0;
	77	comc_started = 1;
	78
	79	outb(COMPORT + com_cfcr, CFCR_DLAB \| COMC_FMT);
	80	outb(COMPORT + com_dlbl, COMC_BPS(COMSPEED) & 0xff);
	81	outb(COMPORT + com_dlbh, COMC_BPS(COMSPEED) >> 8);
	82	outb(COMPORT + com_cfcr, COMC_FMT);
	83	outb(COMPORT + com_mcr, MCR_RTS \| MCR_DTR);
	84
	85	do
	86	inb(COMPORT + com_data);
	87	while (inb(COMPORT + com_lsr) & LSR_RXRDY);
	88
	89	return(0);
	90	}
	91
	92	static void
	93	comc_putchar(int c)
	94	{
	95	int wait;
	96
	97	for (wait = COMC_TXWAIT; wait > 0; wait--)
	98	if (inb(COMPORT + com_lsr) & LSR_TXRDY) {
	99	outb(COMPORT + com_data, (u_char)c);
	100	break;
	101	}
	102	}
	103
	104	static int
	105	comc_getchar(void)
	106	{
	107	return(comc_ischar() ? inb(COMPORT + com_data) : -1);
	108	}
	109
	110	static int
	111	comc_ischar(void)
	112	{
	113	return(inb(COMPORT + com_lsr) & LSR_RXRDY);
	114	}