comconsole.c revision 41285
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 * 2541285Srnordier * $Id: comconsole.c,v 1.4 1998/10/11 10:05:13 peter 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 5741285Srnordier#define COMPORT 0x3f8 5841285Srnordier#define COMSPEED 9600 5941285Srnordier 6038465Smsmithstatic void comc_probe(struct console *cp); 6138465Smsmithstatic int comc_init(int arg); 6239441Smsmithstatic void comc_putchar(int c); 6339441Smsmithstatic int comc_getchar(void); 6439441Smsmithstatic int comc_ischar(void); 6538465Smsmith 6640211Speterstatic int comc_started; 6740211Speter 6838465Smsmithstruct console comconsole = { 6938465Smsmith "comconsole", 7041285Srnordier "serial port", 7138465Smsmith 0, 7238465Smsmith comc_probe, 7338465Smsmith comc_init, 7439441Smsmith comc_putchar, 7539441Smsmith comc_getchar, 7639441Smsmith comc_ischar 7738465Smsmith}; 7838465Smsmith 7938465Smsmithstatic void 8038465Smsmithcomc_probe(struct console *cp) 8138465Smsmith{ 8238465Smsmith /* XXX check the BIOS equipment list? */ 8338465Smsmith cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT); 8438465Smsmith} 8538465Smsmith 8638465Smsmithstatic int 8738465Smsmithcomc_init(int arg) 8838465Smsmith{ 8940211Speter if (comc_started && arg == 0) 9040211Speter return 0; 9140211Speter comc_started = 1; 9240211Speter 9341285Srnordier outb(COMPORT + com_cfcr, CFCR_DLAB | COMC_FMT); 9441285Srnordier outb(COMPORT + com_dlbl, COMC_BPS(COMSPEED) & 0xff); 9541285Srnordier outb(COMPORT + com_dlbh, COMC_BPS(COMSPEED) >> 8); 9641285Srnordier outb(COMPORT + com_cfcr, COMC_FMT); 9741285Srnordier outb(COMPORT + com_mcr, MCR_RTS | MCR_DTR); 9840211Speter 9941285Srnordier do 10041285Srnordier inb(COMPORT + com_data); 10141285Srnordier while (inb(COMPORT + com_lsr) & LSR_RXRDY); 10241285Srnordier 10340211Speter return(0); 10438465Smsmith} 10538465Smsmith 10639441Smsmithstatic void 10739441Smsmithcomc_putchar(int c) 10839441Smsmith{ 10941285Srnordier int wait; 11041285Srnordier 11141285Srnordier for (wait = COMC_TXWAIT; wait > 0; wait--) 11241285Srnordier if (inb(COMPORT + com_lsr) & LSR_TXRDY) { 11341285Srnordier outb(COMPORT + com_data, c); 11441285Srnordier break; 11541285Srnordier } 11639441Smsmith} 11739441Smsmith 11838465Smsmithstatic int 11939441Smsmithcomc_getchar(void) 12038465Smsmith{ 12141285Srnordier return(comc_ischar() ? inb(COMPORT + com_data) : -1); 12238465Smsmith} 12339441Smsmith 12439441Smsmithstatic int 12539441Smsmithcomc_ischar(void) 12639441Smsmith{ 12741285Srnordier return(inb(COMPORT + com_lsr) & LSR_RXRDY); 12839441Smsmith} 129