comconsole.c revision 42480
138465Smsmith/* 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 * 2542480Srnordier * $Id: comconsole.c,v 1.5 1998/11/22 07:59:16 rnordier Exp $ 2638465Smsmith */ 2738465Smsmith 2838465Smsmith#include <stand.h> 2939441Smsmith#include <bootstrap.h> 3041285Srnordier#include <machine/cpufunc.h> 3139441Smsmith#include "libi386.h" 3238465Smsmith 3341285Srnordier/* selected defines from ns16550.h */ 3441285Srnordier#define com_data 0 /* data register (R/W) */ 3541285Srnordier#define com_dlbl 0 /* divisor latch low (W) */ 3641285Srnordier#define com_dlbh 1 /* divisor latch high (W) */ 3741285Srnordier#define com_ier 1 /* interrupt enable (W) */ 3841285Srnordier#define com_iir 2 /* interrupt identification (R) */ 3941285Srnordier#define com_fifo 2 /* FIFO control (W) */ 4041285Srnordier#define com_lctl 3 /* line control register (R/W) */ 4141285Srnordier#define com_cfcr 3 /* line control register (R/W) */ 4241285Srnordier#define com_mcr 4 /* modem control register (R/W) */ 4341285Srnordier#define com_lsr 5 /* line status register (R/W) */ 4441285Srnordier#define com_msr 6 /* modem status register (R/W) */ 4541285Srnordier 4641285Srnordier/* selected defines from sioreg.h */ 4741285Srnordier#define CFCR_DLAB 0x80 4841285Srnordier#define MCR_RTS 0x02 4941285Srnordier#define MCR_DTR 0x01 5041285Srnordier#define LSR_TXRDY 0x20 5141285Srnordier#define LSR_RXRDY 0x01 5241285Srnordier 5341285Srnordier#define COMC_FMT 0x3 /* 8N1 */ 5441285Srnordier#define COMC_TXWAIT 0x40000 /* transmit timeout */ 5541285Srnordier#define COMC_BPS(x) (115200 / (x)) /* speed to DLAB divisor */ 5641285Srnordier 5742480Srnordier#ifndef COMPORT 5841285Srnordier#define COMPORT 0x3f8 5942480Srnordier#endif 6042480Srnordier#ifndef COMSPEED 6141285Srnordier#define COMSPEED 9600 6242480Srnordier#endif 6341285Srnordier 6438465Smsmithstatic void comc_probe(struct console *cp); 6538465Smsmithstatic int comc_init(int arg); 6639441Smsmithstatic void comc_putchar(int c); 6739441Smsmithstatic int comc_getchar(void); 6839441Smsmithstatic int comc_ischar(void); 6938465Smsmith 7040211Speterstatic int comc_started; 7140211Speter 7238465Smsmithstruct console comconsole = { 7338465Smsmith "comconsole", 7441285Srnordier "serial port", 7538465Smsmith 0, 7638465Smsmith comc_probe, 7738465Smsmith comc_init, 7839441Smsmith comc_putchar, 7939441Smsmith comc_getchar, 8039441Smsmith comc_ischar 8138465Smsmith}; 8238465Smsmith 8338465Smsmithstatic void 8438465Smsmithcomc_probe(struct console *cp) 8538465Smsmith{ 8638465Smsmith /* XXX check the BIOS equipment list? */ 8738465Smsmith cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT); 8838465Smsmith} 8938465Smsmith 9038465Smsmithstatic int 9138465Smsmithcomc_init(int arg) 9238465Smsmith{ 9340211Speter if (comc_started && arg == 0) 9440211Speter return 0; 9540211Speter comc_started = 1; 9640211Speter 9741285Srnordier outb(COMPORT + com_cfcr, CFCR_DLAB | COMC_FMT); 9841285Srnordier outb(COMPORT + com_dlbl, COMC_BPS(COMSPEED) & 0xff); 9941285Srnordier outb(COMPORT + com_dlbh, COMC_BPS(COMSPEED) >> 8); 10041285Srnordier outb(COMPORT + com_cfcr, COMC_FMT); 10141285Srnordier outb(COMPORT + com_mcr, MCR_RTS | MCR_DTR); 10240211Speter 10341285Srnordier do 10441285Srnordier inb(COMPORT + com_data); 10541285Srnordier while (inb(COMPORT + com_lsr) & LSR_RXRDY); 10641285Srnordier 10740211Speter return(0); 10838465Smsmith} 10938465Smsmith 11039441Smsmithstatic void 11139441Smsmithcomc_putchar(int c) 11239441Smsmith{ 11341285Srnordier int wait; 11441285Srnordier 11541285Srnordier for (wait = COMC_TXWAIT; wait > 0; wait--) 11641285Srnordier if (inb(COMPORT + com_lsr) & LSR_TXRDY) { 11741285Srnordier outb(COMPORT + com_data, c); 11841285Srnordier break; 11941285Srnordier } 12039441Smsmith} 12139441Smsmith 12238465Smsmithstatic int 12339441Smsmithcomc_getchar(void) 12438465Smsmith{ 12541285Srnordier return(comc_ischar() ? inb(COMPORT + com_data) : -1); 12638465Smsmith} 12739441Smsmith 12839441Smsmithstatic int 12939441Smsmithcomc_ischar(void) 13039441Smsmith{ 13141285Srnordier return(inb(COMPORT + com_lsr) & LSR_RXRDY); 13239441Smsmith} 133