133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/*
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* Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <stand.h>
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#include <bootstrap.h>
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#include <machine/cpufunc.h>
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#include "libi386.h"
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/* selected defines from ns16550.h */
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#define com_data 0 /* data register (R/W) */
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#define com_dlbl 0 /* divisor latch low (W) */
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#define com_dlbh 1 /* divisor latch high (W) */
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#define com_ier 1 /* interrupt enable (W) */
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#define com_iir 2 /* interrupt identification (R) */
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#define com_fifo 2 /* FIFO control (W) */
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#define com_lctl 3 /* line control register (R/W) */
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#define com_cfcr 3 /* line control register (R/W) */
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#define com_mcr 4 /* modem control register (R/W) */
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#define com_lsr 5 /* line status register (R/W) */
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#define com_msr 6 /* modem status register (R/W) */
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/* selected defines from sioreg.h */
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#define CFCR_DLAB 0x80
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#define MCR_RTS 0x02
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#define MCR_DTR 0x01
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#define LSR_TXRDY 0x20
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#define LSR_RXRDY 0x01
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#define COMC_FMT 0x3 /* 8N1 */
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#define COMC_TXWAIT 0x40000 /* transmit timeout */
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#define COMC_BPS(x) (115200 / (x)) /* speed to DLAB divisor */
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#ifndef COMPORT
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#define COMPORT 0x3f8
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#endif
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#ifndef COMSPEED
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#define COMSPEED 9600
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#endif
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static void comc_probe(struct console *cp);
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static int comc_init(int arg);
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static void comc_putchar(int c);
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static int comc_getchar(void);
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static int comc_ischar(void);
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static int comc_started;
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struct console comconsole = {
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"comconsole",
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"serial port",
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0,
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comc_probe,
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comc_init,
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comc_putchar,
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comc_getchar,
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comc_ischar
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};
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static void
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comc_probe(struct console *cp)
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{
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/* XXX check the BIOS equipment list? */
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cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
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}
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static int
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comc_init(int arg)
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{
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if (comc_started && arg == 0)
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return 0;
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comc_started = 1;
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outb(COMPORT + com_cfcr, CFCR_DLAB | COMC_FMT);
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outb(COMPORT + com_dlbl, COMC_BPS(COMSPEED) & 0xff);
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outb(COMPORT + com_dlbh, COMC_BPS(COMSPEED) >> 8);
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outb(COMPORT + com_cfcr, COMC_FMT);
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outb(COMPORT + com_mcr, MCR_RTS | MCR_DTR);
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do
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inb(COMPORT + com_data);
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while (inb(COMPORT + com_lsr) & LSR_RXRDY);
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return(0);
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}
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static void
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comc_putchar(int c)
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{
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int wait;
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for (wait = COMC_TXWAIT; wait > 0; wait--)
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if (inb(COMPORT + com_lsr) & LSR_TXRDY) {
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outb(COMPORT + com_data, (u_char)c);
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break;
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}
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}
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static int
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comc_getchar(void)
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{
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return(comc_ischar() ? inb(COMPORT + com_data) : -1);
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}
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static int
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comc_ischar(void)
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{
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return(inb(COMPORT + com_lsr) & LSR_RXRDY);
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}
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