2 * Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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
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/i386/libi386/Attic/comconsole.c,v 1.3 2003/11/10 06:08:36 dillon Exp $
30 #include <bootstrap.h>
31 #include <machine/cpufunc.h>
32 #include <dev/serial/ic_layer/ns16550.h>
35 #define COMC_FMT 0x3 /* 8N1 */
36 #define COMC_TXWAIT 0x40000 /* transmit timeout */
37 #define COMC_BPS(x) (115200 / (x)) /* speed to DLAB divisor */
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);
52 static int comc_started;
54 struct console comconsole = {
66 comc_probe(struct console *cp)
68 /* XXX check the BIOS equipment list? */
69 cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
75 if (comc_started && arg == 0)
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);
86 inb(COMPORT + com_data);
87 while (inb(COMPORT + com_lsr) & LSR_RXRDY);
97 for (wait = COMC_TXWAIT; wait > 0; wait--)
98 if (inb(COMPORT + com_lsr) & LSR_TXRDY) {
99 outb(COMPORT + com_data, (u_char)c);
107 return(comc_ischar() ? inb(COMPORT + com_data) : -1);
113 return(inb(COMPORT + com_lsr) & LSR_RXRDY);