754 lines
16 KiB
C
754 lines
16 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: @(#)com.c 7.5 (Berkeley) 5/16/91
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* $Id: com.c,v 1.11 1993/07/12 11:37:16 mycroft Exp $
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*/
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#include "com.h"
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#if NCOM > 0
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/*
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* COM driver, based on HP dca driver
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* uses National Semiconductor NS16450/NS16550AF UART
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*/
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#include "param.h"
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#include "systm.h"
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#include "ioctl.h"
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#include "select.h"
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#include "tty.h"
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#include "proc.h"
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#include "user.h"
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#include "conf.h"
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#include "file.h"
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#include "uio.h"
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#include "kernel.h"
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#include "syslog.h"
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#include "types.h"
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#include "i386/isa/isa_device.h"
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#include "i386/isa/comreg.h"
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#include "i386/isa/ic/ns16550.h"
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#define cominor(d)
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int comprobe(), comattach(), comintr(), comstart(), comparam();
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struct isa_driver comdriver = {
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comprobe, comattach, "com"
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};
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int comsoftCAR;
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int com_active;
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int com_hasfifo;
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int ncom = NCOM;
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#ifdef COMCONSOLE
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int comconsole = COMCONSOLE;
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#else
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int comconsole = -1;
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#endif
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int comconsinit;
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int comdefaultrate = TTYDEF_SPEED;
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int commajor;
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short com_addr[NCOM];
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struct tty *com_tty[NCOM];
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struct speedtab comspeedtab[] = {
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0, 0,
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50, COMBRD(50),
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75, COMBRD(75),
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110, COMBRD(110),
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134, COMBRD(134),
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150, COMBRD(150),
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200, COMBRD(200),
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300, COMBRD(300),
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600, COMBRD(600),
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1200, COMBRD(1200),
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1800, COMBRD(1800),
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2400, COMBRD(2400),
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4800, COMBRD(4800),
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9600, COMBRD(9600),
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19200, COMBRD(19200),
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38400, COMBRD(38400),
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57600, COMBRD(57600),
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-1, -1
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};
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extern struct tty *constty;
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#ifdef KGDB
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#include "machine/remote-sl.h"
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extern int kgdb_dev;
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extern int kgdb_rate;
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extern int kgdb_debug_init;
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#endif
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#define UNIT(x) (minor(x))
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comprobe(dev)
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struct isa_device *dev;
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{
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/* force access to id reg */
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outb(dev->id_iobase+com_cfcr, 0);
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outb(dev->id_iobase+com_iir, 0);
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DELAY(100);
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if ((inb(dev->id_iobase+com_iir) & 0x38) == 0)
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return(8);
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return(0);
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}
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int
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comattach(isdp)
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struct isa_device *isdp;
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{
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struct tty *tp;
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u_char unit;
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int port = isdp->id_iobase;
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unit = isdp->id_unit;
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if (unit == comconsole)
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DELAY(1000);
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com_addr[unit] = port;
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com_active |= 1 << unit;
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comsoftCAR |= 1 << unit; /* XXX */
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/* look for a NS 16550AF UART with FIFOs */
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outb(port+com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_4);
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DELAY(100);
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if ((inb(port+com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK) {
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com_hasfifo |= 1 << unit;
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printf("com%d: fifo\n", isdp->id_unit);
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}
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outb(port+com_ier, 0);
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outb(port+com_mcr, 0 | MCR_IENABLE);
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#ifdef KGDB
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if (kgdb_dev == makedev(commajor, unit)) {
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if (comconsole == unit)
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kgdb_dev = -1; /* can't debug over console port */
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else {
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(void) cominit(unit, kgdb_rate);
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if (kgdb_debug_init) {
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/*
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* Print prefix of device name,
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* let kgdb_connect print the rest.
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*/
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printf("com%d: ", unit);
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kgdb_connect(1);
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} else
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printf("com%d: kgdb enabled\n", unit);
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}
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}
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#endif
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/*
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* Need to reset baud rate, etc. of next print so reset comconsinit.
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* Also make sure console is always "hardwired"
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*/
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if (unit == comconsole) {
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comconsinit = 0;
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comsoftCAR |= (1 << unit);
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}
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return (1);
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}
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/* ARGSUSED */
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comopen(dev_t dev, int flag, int mode, struct proc *p)
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{
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register struct tty *tp;
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register int unit;
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int error = 0;
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unit = UNIT(dev);
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if (unit >= NCOM || (com_active & (1 << unit)) == 0)
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return (ENXIO);
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if(!com_tty[unit]) {
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tp = com_tty[unit] = ttymalloc();
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} else
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tp = com_tty[unit];
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tp->t_oproc = comstart;
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tp->t_param = comparam;
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tp->t_dev = dev;
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if ((tp->t_state & TS_ISOPEN) == 0) {
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tp->t_state |= TS_WOPEN;
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ttychars(tp);
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if (tp->t_ispeed == 0) {
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tp->t_iflag = TTYDEF_IFLAG;
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tp->t_oflag = TTYDEF_OFLAG;
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tp->t_cflag = TTYDEF_CFLAG;
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tp->t_lflag = TTYDEF_LFLAG;
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tp->t_ispeed = tp->t_ospeed = comdefaultrate;
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}
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comparam(tp, &tp->t_termios);
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ttsetwater(tp);
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} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
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return (EBUSY);
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(void) spltty();
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(void) commctl(dev, MCR_DTR | MCR_RTS, DMSET);
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if ((comsoftCAR & (1 << unit)) || (commctl(dev, 0, DMGET) & MSR_DCD))
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tp->t_state |= TS_CARR_ON;
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while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
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(tp->t_state & TS_CARR_ON) == 0) {
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tp->t_state |= TS_WOPEN;
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if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
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ttopen, 0))
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break;
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}
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(void) spl0();
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if (error == 0)
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error = (*linesw[tp->t_line].l_open)(dev, tp);
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return (error);
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}
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/*ARGSUSED*/
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comclose(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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register struct tty *tp;
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register com;
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register int unit;
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unit = UNIT(dev);
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com = com_addr[unit];
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tp = com_tty[unit];
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(*linesw[tp->t_line].l_close)(tp, flag);
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outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
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#ifdef KGDB
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/* do not disable interrupts if debugging */
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if (kgdb_dev != makedev(commajor, unit))
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#endif
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outb(com+com_ier, 0);
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if (tp->t_cflag&HUPCL || tp->t_state&TS_WOPEN ||
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(tp->t_state&TS_ISOPEN) == 0)
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(void) commctl(dev, 0, DMSET);
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ttyclose(tp);
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ttyfree(tp);
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com_tty[unit] = (struct tty *)NULL;
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return(0);
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}
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comread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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{
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register struct tty *tp = com_tty[UNIT(dev)];
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return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
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}
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comwrite(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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{
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int unit = UNIT(dev);
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register struct tty *tp = com_tty[unit];
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/*
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* (XXX) We disallow virtual consoles if the physical console is
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* a serial port. This is in case there is a display attached that
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* is not the console. In that situation we don't need/want the X
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* server taking over the console.
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*/
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if (constty && unit == comconsole)
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constty = NULL;
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return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
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}
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comintr(unit)
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register int unit;
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{
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register com;
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register u_char code;
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register struct tty *tp;
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unit;
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com = com_addr[unit];
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while (1) {
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code = inb(com+com_iir);
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switch (code & IIR_IMASK) {
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case IIR_NOPEND:
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return (1);
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case IIR_RXTOUT:
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case IIR_RXRDY:
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tp = com_tty[unit];
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/*
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* Process received bytes. Inline for speed...
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*/
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#ifdef KGDB
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#define RCVBYTE() \
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code = inb(com+com_data); \
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if ((tp->t_state & TS_ISOPEN) == 0) { \
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if (kgdb_dev == makedev(commajor, unit) && \
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code == FRAME_END) \
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kgdb_connect(0); /* trap into kgdb */ \
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} else \
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(*linesw[tp->t_line].l_rint)(code, tp)
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#else
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#define RCVBYTE() \
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code = inb(com+com_data); \
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if (tp->t_state & TS_ISOPEN) \
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(*linesw[tp->t_line].l_rint)(code, tp)
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#endif
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RCVBYTE();
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if (com_hasfifo & (1 << unit))
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while ((code = inb(com+com_lsr)) & LSR_RCV_MASK) {
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if (code == LSR_RXRDY) {
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RCVBYTE();
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} else
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comeint(unit, code, com);
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}
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break;
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case IIR_TXRDY:
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tp = com_tty[unit];
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tp->t_state &=~ (TS_BUSY|TS_FLUSH);
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if (tp->t_line)
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(*linesw[tp->t_line].l_start)(tp);
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else
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comstart(tp);
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break;
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case IIR_RLS:
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comeint(unit, inb(com+com_lsr), com);
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break;
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default:
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if (code & IIR_NOPEND)
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return (1);
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log(LOG_WARNING, "com%d: weird interrupt: 0x%x\n",
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unit, code);
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/* fall through */
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case IIR_MLSC:
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commint(unit, com);
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break;
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}
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}
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}
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comeint(unit, stat, com)
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register int unit, stat;
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register com;
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{
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register struct tty *tp;
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register int c;
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tp = com_tty[unit];
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c = inb(com+com_data);
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if ((tp->t_state & TS_ISOPEN) == 0) {
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#ifdef KGDB
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/* we don't care about parity errors */
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if (((stat & (LSR_BI|LSR_FE|LSR_PE)) == LSR_PE) &&
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kgdb_dev == makedev(commajor, unit) && c == FRAME_END)
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kgdb_connect(0); /* trap into kgdb */
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#endif
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return;
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}
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if (stat & (LSR_BI | LSR_FE))
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c |= TTY_FE;
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else if (stat & LSR_PE)
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c |= TTY_PE;
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else if (stat & LSR_OE) { /* 30 Aug 92*/
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c |= TTY_PE; /* Ought to have it's own define... */
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log(LOG_WARNING, "com%d: silo overflow\n", unit);
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}
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(*linesw[tp->t_line].l_rint)(c, tp);
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}
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commint(unit, com)
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register int unit;
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register com;
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{
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register struct tty *tp;
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register int stat;
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tp = com_tty[unit];
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stat = inb(com+com_msr);
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if ((stat & MSR_DDCD) && (comsoftCAR & (1 << unit)) == 0) {
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if (stat & MSR_DCD)
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(void)(*linesw[tp->t_line].l_modem)(tp, 1);
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else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
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outb(com+com_mcr,
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inb(com+com_mcr) & ~(MCR_DTR | MCR_RTS) | MCR_IENABLE);
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} else if ((stat & MSR_DCTS) && (tp->t_state & TS_ISOPEN) &&
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(tp->t_flags & CRTSCTS)) {
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/* the line is up and we want to do rts/cts flow control */
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if (stat & MSR_CTS) {
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tp->t_state &=~ TS_TTSTOP;
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ttstart(tp);
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} else
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tp->t_state |= TS_TTSTOP;
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}
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}
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comioctl(dev, cmd, data, flag)
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dev_t dev;
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caddr_t data;
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{
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register struct tty *tp;
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register int unit = UNIT(dev);
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register com;
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register int error;
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tp = com_tty[unit];
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error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
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if (error >= 0)
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return (error);
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error = ttioctl(tp, cmd, data, flag);
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if (error >= 0)
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return (error);
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com = com_addr[unit];
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switch (cmd) {
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case TIOCSBRK:
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outb(com+com_cfcr, inb(com+com_cfcr) | CFCR_SBREAK);
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break;
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case TIOCCBRK:
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outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
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break;
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case TIOCSDTR:
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(void) commctl(dev, MCR_DTR | MCR_RTS, DMBIS);
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break;
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case TIOCCDTR:
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(void) commctl(dev, MCR_DTR | MCR_RTS, DMBIC);
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break;
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case TIOCMSET:
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(void) commctl(dev, *(int *)data, DMSET);
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break;
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case TIOCMBIS:
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(void) commctl(dev, *(int *)data, DMBIS);
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break;
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case TIOCMBIC:
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(void) commctl(dev, *(int *)data, DMBIC);
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break;
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case TIOCMGET:
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*(int *)data = commctl(dev, 0, DMGET);
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break;
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default:
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return (ENOTTY);
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}
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return (0);
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}
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comparam(tp, t)
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register struct tty *tp;
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register struct termios *t;
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{
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register com;
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register int cfcr, cflag = t->c_cflag;
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int unit = UNIT(tp->t_dev);
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int ospeed = ttspeedtab(t->c_ospeed, comspeedtab);
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/* check requested parameters */
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if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
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return(EINVAL);
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/* and copy to tty */
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tp->t_ispeed = t->c_ispeed;
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tp->t_ospeed = t->c_ospeed;
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tp->t_cflag = cflag;
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com = com_addr[unit];
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outb(com+com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS /*| IER_EMSC*/);
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if (ospeed == 0) {
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(void) commctl(unit, 0, DMSET); /* hang up line */
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return(0);
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}
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outb(com+com_cfcr, inb(com+com_cfcr) | CFCR_DLAB);
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outb(com+com_data, ospeed & 0xFF);
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outb(com+com_ier, ospeed >> 8);
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switch (cflag&CSIZE) {
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case CS5:
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cfcr = CFCR_5BITS; break;
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case CS6:
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cfcr = CFCR_6BITS; break;
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case CS7:
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cfcr = CFCR_7BITS; break;
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case CS8:
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cfcr = CFCR_8BITS; break;
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}
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if (cflag&PARENB) {
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cfcr |= CFCR_PENAB;
|
|
if ((cflag&PARODD) == 0)
|
|
cfcr |= CFCR_PEVEN;
|
|
}
|
|
if (cflag&CSTOPB)
|
|
cfcr |= CFCR_STOPB;
|
|
outb(com+com_cfcr, cfcr);
|
|
|
|
if (com_hasfifo & (1 << unit))
|
|
outb(com+com_fifo, FIFO_ENABLE | FIFO_TRIGGER_4);
|
|
|
|
return(0);
|
|
}
|
|
|
|
comstart(tp)
|
|
register struct tty *tp;
|
|
{
|
|
register com;
|
|
int s, unit, c;
|
|
|
|
unit = UNIT(tp->t_dev);
|
|
com = com_addr[unit];
|
|
s = spltty();
|
|
if (tp->t_state & (TS_TIMEOUT|TS_TTSTOP))
|
|
goto out;
|
|
if (tp->t_outq.c_cc <= tp->t_lowat) {
|
|
if (tp->t_state&TS_ASLEEP) {
|
|
tp->t_state &= ~TS_ASLEEP;
|
|
wakeup((caddr_t)&tp->t_outq);
|
|
}
|
|
selwakeup(&tp->t_wsel);
|
|
}
|
|
if (tp->t_outq.c_cc == 0)
|
|
goto out;
|
|
if (inb(com+com_lsr) & LSR_TXRDY) {
|
|
c = getc(&tp->t_outq);
|
|
tp->t_state |= TS_BUSY;
|
|
outb(com+com_data, c);
|
|
if (com_hasfifo & (1 << unit))
|
|
for (c = 1; c < 16 && tp->t_outq.c_cc; ++c)
|
|
outb(com+com_data, getc(&tp->t_outq));
|
|
}
|
|
out:
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Stop output on a line.
|
|
*/
|
|
/*ARGSUSED*/
|
|
comstop(tp, flag)
|
|
register struct tty *tp;
|
|
{
|
|
register int s;
|
|
|
|
s = spltty();
|
|
if (tp->t_state & TS_BUSY) {
|
|
if ((tp->t_state&TS_TTSTOP)==0)
|
|
tp->t_state |= TS_FLUSH;
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
commctl(dev, bits, how)
|
|
dev_t dev;
|
|
int bits, how;
|
|
{
|
|
register com;
|
|
register int unit;
|
|
int s;
|
|
|
|
unit = UNIT(dev);
|
|
com = com_addr[unit];
|
|
s = spltty();
|
|
switch (how) {
|
|
|
|
case DMSET:
|
|
outb(com+com_mcr, bits | MCR_IENABLE);
|
|
break;
|
|
|
|
case DMBIS:
|
|
outb(com+com_mcr, inb(com+com_mcr) | bits | MCR_IENABLE);
|
|
break;
|
|
|
|
case DMBIC:
|
|
outb(com+com_mcr, inb(com+com_mcr) & ~bits | MCR_IENABLE);
|
|
break;
|
|
|
|
case DMGET:
|
|
bits = inb(com+com_msr);
|
|
break;
|
|
}
|
|
(void) splx(s);
|
|
return(bits);
|
|
}
|
|
|
|
/*
|
|
* Following are all routines needed for COM to act as console
|
|
*/
|
|
#include "i386/i386/cons.h"
|
|
|
|
comcnprobe(cp)
|
|
struct consdev *cp;
|
|
{
|
|
int unit;
|
|
|
|
/* locate the major number */
|
|
for (commajor = 0; commajor < nchrdev; commajor++)
|
|
if (cdevsw[commajor].d_open == comopen)
|
|
break;
|
|
|
|
/* XXX: ick */
|
|
unit = CONUNIT;
|
|
com_addr[CONUNIT] = CONADDR;
|
|
|
|
/* make sure hardware exists? XXX */
|
|
|
|
/* initialize required fields */
|
|
cp->cn_dev = makedev(commajor, unit);
|
|
#ifdef COMCONSOLE
|
|
cp->cn_pri = CN_REMOTE; /* Force a serial port console */
|
|
#else
|
|
cp->cn_pri = CN_NORMAL;
|
|
#endif
|
|
}
|
|
|
|
comcninit(cp)
|
|
struct consdev *cp;
|
|
{
|
|
int unit = UNIT(cp->cn_dev);
|
|
|
|
cominit(unit, comdefaultrate);
|
|
comconsole = unit;
|
|
comconsinit = 1;
|
|
}
|
|
|
|
cominit(unit, rate)
|
|
int unit, rate;
|
|
{
|
|
register int com;
|
|
int s;
|
|
short stat;
|
|
|
|
#ifdef lint
|
|
stat = unit; if (stat) return;
|
|
#endif
|
|
com = com_addr[unit];
|
|
s = splhigh();
|
|
outb(com+com_cfcr, CFCR_DLAB);
|
|
rate = ttspeedtab(comdefaultrate, comspeedtab);
|
|
outb(com+com_data, rate & 0xFF);
|
|
outb(com+com_ier, rate >> 8);
|
|
outb(com+com_cfcr, CFCR_8BITS);
|
|
outb(com+com_ier, IER_ERXRDY | IER_ETXRDY);
|
|
outb(com+com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_4);
|
|
stat = inb(com+com_iir);
|
|
splx(s);
|
|
}
|
|
|
|
comcngetc(dev)
|
|
{
|
|
register com = com_addr[UNIT(dev)];
|
|
short stat;
|
|
int c, s;
|
|
|
|
#ifdef lint
|
|
stat = dev; if (stat) return(0);
|
|
#endif
|
|
s = splhigh();
|
|
while (((stat = inb(com+com_lsr)) & LSR_RXRDY) == 0)
|
|
;
|
|
c = inb(com+com_data);
|
|
stat = inb(com+com_iir);
|
|
splx(s);
|
|
return(c);
|
|
}
|
|
|
|
/*
|
|
* Console kernel output character routine.
|
|
*/
|
|
comcnputc(dev, c)
|
|
dev_t dev;
|
|
register int c;
|
|
{
|
|
register com = com_addr[UNIT(dev)];
|
|
register int timo;
|
|
short stat;
|
|
int s = splhigh();
|
|
|
|
#ifdef lint
|
|
stat = dev; if (stat) return;
|
|
#endif
|
|
#ifdef KGDB
|
|
if (dev != kgdb_dev)
|
|
#endif
|
|
if (comconsinit == 0) {
|
|
(void) cominit(UNIT(dev), comdefaultrate);
|
|
comconsinit = 1;
|
|
}
|
|
/* wait for any pending transmission to finish */
|
|
timo = 50000;
|
|
while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
|
|
;
|
|
outb(com+com_data, c);
|
|
/* wait for this transmission to complete */
|
|
timo = 1500000;
|
|
while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
|
|
;
|
|
/* clear any interrupts generated by this transmission */
|
|
stat = inb(com+com_iir);
|
|
splx(s);
|
|
}
|
|
|
|
int
|
|
comselect(dev, rw, p)
|
|
dev_t dev;
|
|
int rw;
|
|
struct proc *p;
|
|
{
|
|
register struct tty *tp = com_tty[UNIT(dev)];
|
|
int nread;
|
|
int s = spltty();
|
|
struct proc *selp;
|
|
|
|
switch (rw) {
|
|
|
|
case FREAD:
|
|
nread = ttnread(tp);
|
|
if (nread > 0 ||
|
|
((tp->t_cflag&CLOCAL) == 0 && (tp->t_state&TS_CARR_ON) == 0))
|
|
goto win;
|
|
selrecord(p, &tp->t_rsel);
|
|
break;
|
|
|
|
case FWRITE:
|
|
if (tp->t_outq.c_cc <= tp->t_lowat)
|
|
goto win;
|
|
selrecord(p, &tp->t_wsel);
|
|
break;
|
|
}
|
|
splx(s);
|
|
return (0);
|
|
win:
|
|
splx(s);
|
|
return (1);
|
|
}
|
|
|
|
#endif
|