comconsole.c revision 119482
1119482Sobrien/*- 238465Smsmith * Copyright (c) 1998 Michael Smith (msmith@freebsd.org) 338465Smsmith * 438465Smsmith * Redistribution and use in source and binary forms, with or without 538465Smsmith * modification, are permitted provided that the following conditions 638465Smsmith * are met: 738465Smsmith * 1. Redistributions of source code must retain the above copyright 838465Smsmith * notice, this list of conditions and the following disclaimer. 938465Smsmith * 2. Redistributions in binary form must reproduce the above copyright 1038465Smsmith * notice, this list of conditions and the following disclaimer in the 1138465Smsmith * documentation and/or other materials provided with the distribution. 1238465Smsmith * 1338465Smsmith * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1438465Smsmith * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1538465Smsmith * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1638465Smsmith * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1738465Smsmith * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1838465Smsmith * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 1938465Smsmith * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2038465Smsmith * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2138465Smsmith * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2238465Smsmith * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2338465Smsmith * SUCH DAMAGE. 2438465Smsmith */ 2538465Smsmith 26119482Sobrien#include <sys/cdefs.h> 27119482Sobrien__FBSDID("$FreeBSD: head/sys/boot/i386/libi386/comconsole.c 119482 2003-08-25 23:28:32Z obrien $"); 28119482Sobrien 2938465Smsmith#include <stand.h> 3039441Smsmith#include <bootstrap.h> 3141285Srnordier#include <machine/cpufunc.h> 3239441Smsmith#include "libi386.h" 3338465Smsmith 3441285Srnordier/* selected defines from ns16550.h */ 3541285Srnordier#define com_data 0 /* data register (R/W) */ 3641285Srnordier#define com_dlbl 0 /* divisor latch low (W) */ 3741285Srnordier#define com_dlbh 1 /* divisor latch high (W) */ 3841285Srnordier#define com_ier 1 /* interrupt enable (W) */ 3941285Srnordier#define com_iir 2 /* interrupt identification (R) */ 4041285Srnordier#define com_fifo 2 /* FIFO control (W) */ 4141285Srnordier#define com_lctl 3 /* line control register (R/W) */ 4241285Srnordier#define com_cfcr 3 /* line control register (R/W) */ 4341285Srnordier#define com_mcr 4 /* modem control register (R/W) */ 4441285Srnordier#define com_lsr 5 /* line status register (R/W) */ 4541285Srnordier#define com_msr 6 /* modem status register (R/W) */ 4641285Srnordier 4741285Srnordier/* selected defines from sioreg.h */ 4841285Srnordier#define CFCR_DLAB 0x80 4941285Srnordier#define MCR_RTS 0x02 5041285Srnordier#define MCR_DTR 0x01 5141285Srnordier#define LSR_TXRDY 0x20 5241285Srnordier#define LSR_RXRDY 0x01 5341285Srnordier 5441285Srnordier#define COMC_FMT 0x3 /* 8N1 */ 5541285Srnordier#define COMC_TXWAIT 0x40000 /* transmit timeout */ 5641285Srnordier#define COMC_BPS(x) (115200 / (x)) /* speed to DLAB divisor */ 5741285Srnordier 5842480Srnordier#ifndef COMPORT 5941285Srnordier#define COMPORT 0x3f8 6042480Srnordier#endif 6142480Srnordier#ifndef COMSPEED 6241285Srnordier#define COMSPEED 9600 6342480Srnordier#endif 6441285Srnordier 6538465Smsmithstatic void comc_probe(struct console *cp); 6638465Smsmithstatic int comc_init(int arg); 6739441Smsmithstatic void comc_putchar(int c); 6839441Smsmithstatic int comc_getchar(void); 6939441Smsmithstatic int comc_ischar(void); 7038465Smsmith 7140211Speterstatic int comc_started; 7240211Speter 7338465Smsmithstruct console comconsole = { 7438465Smsmith "comconsole", 7541285Srnordier "serial port", 7638465Smsmith 0, 7738465Smsmith comc_probe, 7838465Smsmith comc_init, 7939441Smsmith comc_putchar, 8039441Smsmith comc_getchar, 8139441Smsmith comc_ischar 8238465Smsmith}; 8338465Smsmith 8438465Smsmithstatic void 8538465Smsmithcomc_probe(struct console *cp) 8638465Smsmith{ 8738465Smsmith /* XXX check the BIOS equipment list? */ 8838465Smsmith cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT); 8938465Smsmith} 9038465Smsmith 9138465Smsmithstatic int 9238465Smsmithcomc_init(int arg) 9338465Smsmith{ 9440211Speter if (comc_started && arg == 0) 9540211Speter return 0; 9640211Speter comc_started = 1; 9740211Speter 9841285Srnordier outb(COMPORT + com_cfcr, CFCR_DLAB | COMC_FMT); 9941285Srnordier outb(COMPORT + com_dlbl, COMC_BPS(COMSPEED) & 0xff); 10041285Srnordier outb(COMPORT + com_dlbh, COMC_BPS(COMSPEED) >> 8); 10141285Srnordier outb(COMPORT + com_cfcr, COMC_FMT); 10241285Srnordier outb(COMPORT + com_mcr, MCR_RTS | MCR_DTR); 10340211Speter 10441285Srnordier do 10541285Srnordier inb(COMPORT + com_data); 10641285Srnordier while (inb(COMPORT + com_lsr) & LSR_RXRDY); 10741285Srnordier 10840211Speter return(0); 10938465Smsmith} 11038465Smsmith 11139441Smsmithstatic void 11239441Smsmithcomc_putchar(int c) 11339441Smsmith{ 11441285Srnordier int wait; 11541285Srnordier 11641285Srnordier for (wait = COMC_TXWAIT; wait > 0; wait--) 11741285Srnordier if (inb(COMPORT + com_lsr) & LSR_TXRDY) { 11864187Sjhb outb(COMPORT + com_data, (u_char)c); 11941285Srnordier break; 12041285Srnordier } 12139441Smsmith} 12239441Smsmith 12338465Smsmithstatic int 12439441Smsmithcomc_getchar(void) 12538465Smsmith{ 12641285Srnordier return(comc_ischar() ? inb(COMPORT + com_data) : -1); 12738465Smsmith} 12839441Smsmith 12939441Smsmithstatic int 13039441Smsmithcomc_ischar(void) 13139441Smsmith{ 13241285Srnordier return(inb(COMPORT + com_lsr) & LSR_RXRDY); 13339441Smsmith} 134