946 lines
21 KiB
C
946 lines
21 KiB
C
/* $NetBSD: com.c,v 1.53 1995/04/28 00:34:08 hpeyerl Exp $ */
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/*-
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* Copyright (c) 1993, 1994, 1995 Charles Hannum. All rights reserved.
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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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* @(#)com.c 7.5 (Berkeley) 5/16/91
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*/
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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 <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/select.h>
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#include <sys/tty.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/conf.h>
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#include <sys/file.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <sys/types.h>
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#include <sys/device.h>
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#include <machine/cpu.h>
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#include <machine/pio.h>
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#include <dev/isa/isavar.h>
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#include <dev/isa/comreg.h>
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#include <dev/ic/ns16550.h>
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struct com_softc {
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struct device sc_dev;
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void *sc_ih;
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struct tty *sc_tty;
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int sc_overflows;
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int sc_iobase;
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u_char sc_hwflags;
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#define COM_HW_NOIEN 0x01
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#define COM_HW_FIFO 0x02
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#define COM_HW_CONSOLE 0x40
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u_char sc_swflags;
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#define COM_SW_SOFTCAR 0x01
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#define COM_SW_CLOCAL 0x02
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#define COM_SW_CRTSCTS 0x04
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#define COM_SW_MDMBUF 0x08
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u_char sc_msr, sc_mcr;
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};
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int comprobe __P((struct device *, void *, void *));
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void comattach __P((struct device *, struct device *, void *));
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int comopen __P((dev_t, int, int, struct proc *));
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int comclose __P((dev_t, int, int, struct proc *));
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void comdiag __P((void *));
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int comintr __P((void *));
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int comparam __P((struct tty *, struct termios *));
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void comstart __P((struct tty *));
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struct cfdriver comcd = {
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NULL, "com", comprobe, comattach, DV_TTY, sizeof(struct com_softc)
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};
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int comdefaultrate = TTYDEF_SPEED;
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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 commajor;
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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 COMUNIT(x) (minor(x))
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#define bis(c, b) do { const register int com_ad = (c); \
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outb(com_ad, inb(com_ad) | (b)); } while(0)
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#define bic(c, b) do { const register int com_ad = (c); \
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outb(com_ad, inb(com_ad) & ~(b)); } while(0)
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int
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comspeed(speed)
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long speed;
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{
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#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
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int x, err;
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if (speed == 0)
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return 0;
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if (speed < 0)
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return -1;
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x = divrnd((COM_FREQ / 16), speed);
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if (x <= 0)
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return -1;
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err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000;
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if (err < 0)
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err = -err;
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if (err > COM_TOLERANCE)
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return -1;
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return x;
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#undef divrnd(n, q)
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}
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int
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comprobe1(iobase)
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int iobase;
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{
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/* force access to id reg */
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outb(iobase + com_cfcr, 0);
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outb(iobase + com_iir, 0);
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if (inb(iobase + com_iir) & 0x38)
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return 0;
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return 1;
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}
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int
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comprobe(parent, match, aux)
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struct device *parent;
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void *match, *aux;
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{
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struct isa_attach_args *ia = aux;
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int iobase = ia->ia_iobase;
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if (!comprobe1(iobase))
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return 0;
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ia->ia_iosize = COM_NPORTS;
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ia->ia_msize = 0;
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return 1;
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}
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void
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comattach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct com_softc *sc = (void *)self;
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struct isa_attach_args *ia = aux;
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struct cfdata *cf = sc->sc_dev.dv_cfdata;
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int iobase = ia->ia_iobase;
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struct tty *tp;
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sc->sc_iobase = iobase;
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sc->sc_hwflags = cf->cf_flags & COM_HW_NOIEN;
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sc->sc_swflags = 0;
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if (sc->sc_dev.dv_unit == comconsole)
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delay(1000);
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/* look for a NS 16550AF UART with FIFOs */
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outb(iobase + com_fifo,
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FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14);
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delay(100);
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if ((inb(iobase + com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK)
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if ((inb(iobase + com_fifo) & FIFO_TRIGGER_14) == FIFO_TRIGGER_14) {
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sc->sc_hwflags |= COM_HW_FIFO;
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printf(": ns16550a, working fifo\n");
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} else
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printf(": ns82550 or ns16550, broken fifo\n");
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else
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printf(": ns82450 or ns16450, no fifo\n");
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outb(iobase + com_fifo, 0);
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/* disable interrupts */
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outb(iobase + com_ier, 0);
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outb(iobase + com_mcr, 0);
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if (ia->ia_irq != IRQUNK)
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sc->sc_ih = isa_intr_establish(ia->ia_irq, ISA_IST_EDGE,
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ISA_IPL_TTY, comintr, sc);
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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("%s: ", sc->sc_dev.dv_xname);
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kgdb_connect(1);
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} else
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printf("%s: kgdb enabled\n",
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sc->sc_dev.dv_xname);
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}
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}
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#endif
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if (sc->sc_dev.dv_unit == comconsole) {
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/*
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* Need to reset baud rate, etc. of next print so reset
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* comconsinit. Also make sure console is always "hardwired".
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*/
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comconsinit = 0;
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sc->sc_hwflags |= COM_HW_CONSOLE;
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sc->sc_swflags |= COM_SW_SOFTCAR;
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}
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}
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int
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comopen(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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int unit = COMUNIT(dev);
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struct com_softc *sc;
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int iobase;
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struct tty *tp;
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int s;
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int error = 0;
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if (unit >= comcd.cd_ndevs)
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return ENXIO;
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sc = comcd.cd_devs[unit];
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if (!sc)
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return ENXIO;
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s = spltty();
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if (!sc->sc_tty)
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tp = sc->sc_tty = ttymalloc();
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else
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tp = sc->sc_tty;
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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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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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if (sc->sc_swflags & COM_SW_CLOCAL)
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tp->t_cflag |= CLOCAL;
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if (sc->sc_swflags & COM_SW_CRTSCTS)
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tp->t_cflag |= CRTSCTS;
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if (sc->sc_swflags & COM_SW_MDMBUF)
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tp->t_cflag |= MDMBUF;
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tp->t_lflag = TTYDEF_LFLAG;
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tp->t_ispeed = tp->t_ospeed = comdefaultrate;
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comparam(tp, &tp->t_termios);
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ttsetwater(tp);
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iobase = sc->sc_iobase;
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/* Set the FIFO threshold based on the receive speed. */
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if (sc->sc_hwflags & COM_HW_FIFO)
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outb(iobase + com_fifo,
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FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
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(tp->t_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
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/* flush any pending I/O */
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(void) inb(iobase + com_lsr);
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(void) inb(iobase + com_data);
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/* you turn me on, baby */
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sc->sc_mcr = MCR_DTR | MCR_RTS;
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if (!(sc->sc_hwflags & COM_HW_NOIEN))
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sc->sc_mcr |= MCR_IENABLE;
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outb(iobase + com_mcr, sc->sc_mcr);
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outb(iobase + com_ier,
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IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC);
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sc->sc_msr = inb(iobase + com_msr);
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if (sc->sc_swflags & COM_SW_SOFTCAR || sc->sc_msr & MSR_DCD ||
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tp->t_cflag & MDMBUF)
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tp->t_state |= TS_CARR_ON;
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else
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tp->t_state &= ~TS_CARR_ON;
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} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) {
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splx(s);
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return EBUSY;
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}
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/* wait for carrier if necessary */
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if ((flag & O_NONBLOCK) == 0)
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while ((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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error = ttysleep(tp, (caddr_t)&tp->t_rawq,
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TTIPRI | PCATCH, ttopen, 0);
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if (error) {
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/* XXX should turn off chip if we're the
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only waiter */
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splx(s);
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return error;
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}
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}
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splx(s);
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return (*linesw[tp->t_line].l_open)(dev, tp);
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}
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int
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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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int unit = COMUNIT(dev);
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struct com_softc *sc = comcd.cd_devs[unit];
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struct tty *tp = sc->sc_tty;
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int iobase = sc->sc_iobase;
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(*linesw[tp->t_line].l_close)(tp, flag);
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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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{
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bic(iobase + com_cfcr, CFCR_SBREAK);
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outb(iobase + com_ier, 0);
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if (tp->t_cflag & HUPCL &&
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(sc->sc_swflags & COM_SW_SOFTCAR) == 0)
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/* XXX perhaps only clear DTR */
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outb(iobase + com_mcr, 0);
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}
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ttyclose(tp);
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#ifdef notyet /* XXXX */
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if (unit != comconsole) {
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ttyfree(tp);
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sc->sc_tty = 0;
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}
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#endif
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return 0;
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}
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int
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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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int flag;
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{
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struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)];
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struct tty *tp = sc->sc_tty;
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return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
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}
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int
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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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int flag;
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{
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struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)];
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struct tty *tp = sc->sc_tty;
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return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
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}
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struct tty *
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comtty(dev)
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dev_t dev;
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{
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struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)];
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struct tty *tp = sc->sc_tty;
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return (tp);
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}
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static u_char
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tiocm_xxx2mcr(data)
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int data;
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{
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u_char m = 0;
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if (data & TIOCM_DTR)
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m |= MCR_DTR;
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if (data & TIOCM_RTS)
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m |= MCR_RTS;
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return m;
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}
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int
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comioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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int unit = COMUNIT(dev);
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struct com_softc *sc = comcd.cd_devs[unit];
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struct tty *tp = sc->sc_tty;
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int iobase = sc->sc_iobase;
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int error;
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error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
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if (error >= 0)
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return error;
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error = ttioctl(tp, cmd, data, flag, p);
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if (error >= 0)
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return error;
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switch (cmd) {
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case TIOCSBRK:
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bis(iobase + com_cfcr, CFCR_SBREAK);
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break;
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case TIOCCBRK:
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bic(iobase + com_cfcr, CFCR_SBREAK);
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break;
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case TIOCSDTR:
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outb(iobase + com_mcr, sc->sc_mcr |= (MCR_DTR | MCR_RTS));
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break;
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case TIOCCDTR:
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outb(iobase + com_mcr, sc->sc_mcr &= ~(MCR_DTR | MCR_RTS));
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break;
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case TIOCMSET:
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sc->sc_mcr &= ~(MCR_DTR | MCR_RTS);
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case TIOCMBIS:
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outb(iobase + com_mcr,
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sc->sc_mcr |= tiocm_xxx2mcr(*(int *)data));
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break;
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case TIOCMBIC:
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outb(iobase + com_mcr,
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sc->sc_mcr &= ~tiocm_xxx2mcr(*(int *)data));
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break;
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case TIOCMGET: {
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u_char m;
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int bits = 0;
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m = sc->sc_mcr;
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if (m & MCR_DTR)
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bits |= TIOCM_DTR;
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if (m & MCR_RTS)
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bits |= TIOCM_RTS;
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m = sc->sc_msr;
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if (m & MSR_DCD)
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bits |= TIOCM_CD;
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if (m & MSR_CTS)
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bits |= TIOCM_CTS;
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if (m & MSR_DSR)
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bits |= TIOCM_DSR;
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if (m & (MSR_RI | MSR_TERI))
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bits |= TIOCM_RI;
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if (inb(iobase + com_ier))
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bits |= TIOCM_LE;
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*(int *)data = bits;
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break;
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}
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case TIOCGFLAGS: {
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int bits = 0;
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if (sc->sc_swflags & COM_SW_SOFTCAR)
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bits |= TIOCFLAG_SOFTCAR;
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if (sc->sc_swflags & COM_SW_CLOCAL)
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bits |= TIOCFLAG_CLOCAL;
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if (sc->sc_swflags & COM_SW_CRTSCTS)
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bits |= TIOCFLAG_CRTSCTS;
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if (sc->sc_swflags & COM_SW_MDMBUF)
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bits |= TIOCFLAG_MDMBUF;
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*(int *)data = bits;
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break;
|
|
}
|
|
case TIOCSFLAGS: {
|
|
int userbits, driverbits = 0;
|
|
|
|
error = suser(p->p_ucred, &p->p_acflag);
|
|
if (error != 0)
|
|
return(EPERM);
|
|
|
|
userbits = *(int *)data;
|
|
if ((userbits & TIOCFLAG_SOFTCAR) ||
|
|
(sc->sc_hwflags & COM_HW_CONSOLE))
|
|
driverbits |= COM_SW_SOFTCAR;
|
|
if (userbits & TIOCFLAG_CLOCAL)
|
|
driverbits |= COM_SW_CLOCAL;
|
|
if (userbits & TIOCFLAG_CRTSCTS)
|
|
driverbits |= COM_SW_CRTSCTS;
|
|
if (userbits & TIOCFLAG_MDMBUF)
|
|
driverbits |= COM_SW_MDMBUF;
|
|
|
|
sc->sc_swflags = driverbits;
|
|
break;
|
|
}
|
|
default:
|
|
return ENOTTY;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
comparam(tp, t)
|
|
struct tty *tp;
|
|
struct termios *t;
|
|
{
|
|
struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)];
|
|
int iobase = sc->sc_iobase;
|
|
int ospeed = comspeed(t->c_ospeed);
|
|
u_char cfcr;
|
|
int s;
|
|
|
|
/* check requested parameters */
|
|
if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
|
|
return EINVAL;
|
|
|
|
switch (t->c_cflag & CSIZE) {
|
|
case CS5:
|
|
cfcr = CFCR_5BITS;
|
|
break;
|
|
case CS6:
|
|
cfcr = CFCR_6BITS;
|
|
break;
|
|
case CS7:
|
|
cfcr = CFCR_7BITS;
|
|
break;
|
|
case CS8:
|
|
cfcr = CFCR_8BITS;
|
|
break;
|
|
}
|
|
if (t->c_cflag & PARENB) {
|
|
cfcr |= CFCR_PENAB;
|
|
if ((t->c_cflag & PARODD) == 0)
|
|
cfcr |= CFCR_PEVEN;
|
|
}
|
|
if (t->c_cflag & CSTOPB)
|
|
cfcr |= CFCR_STOPB;
|
|
|
|
s = spltty();
|
|
|
|
if (ospeed == 0)
|
|
outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_DTR);
|
|
|
|
/*
|
|
* Set the FIFO threshold based on the receive speed, if we are
|
|
* changing it.
|
|
*
|
|
* XXX
|
|
* It would be better if we waited for the FIFO to empty, so we don't
|
|
* lose any in-transit characters.
|
|
*/
|
|
if (tp->t_ispeed != t->c_ispeed) {
|
|
if (sc->sc_hwflags & COM_HW_FIFO)
|
|
outb(iobase + com_fifo,
|
|
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
|
|
(t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
|
|
}
|
|
|
|
outb(iobase + com_cfcr, cfcr | CFCR_DLAB);
|
|
outb(iobase + com_dlbl, ospeed);
|
|
outb(iobase + com_dlbh, ospeed>>8);
|
|
outb(iobase + com_cfcr, cfcr);
|
|
|
|
if (ospeed != 0)
|
|
outb(iobase + com_mcr, sc->sc_mcr |= MCR_DTR);
|
|
|
|
/* When not using CRTSCTS, RTS follows DTR. */
|
|
if ((t->c_cflag & CRTSCTS) == 0) {
|
|
if (sc->sc_mcr & MCR_DTR) {
|
|
if ((sc->sc_mcr & MCR_RTS) == 0)
|
|
outb(iobase + com_mcr, sc->sc_mcr |= MCR_RTS);
|
|
} else {
|
|
if (sc->sc_mcr & MCR_RTS)
|
|
outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_RTS);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If CTS is off and CRTSCTS is changed, we must toggle TS_TTSTOP.
|
|
* XXX should be done at tty layer.
|
|
*/
|
|
if ((sc->sc_msr & MSR_CTS) == 0 &&
|
|
(tp->t_cflag & CRTSCTS) != (t->c_cflag & CRTSCTS)) {
|
|
if ((t->c_cflag & CRTSCTS) == 0) {
|
|
tp->t_state &= ~TS_TTSTOP;
|
|
(*linesw[tp->t_line].l_start)(tp);
|
|
} else
|
|
tp->t_state |= TS_TTSTOP;
|
|
}
|
|
|
|
/*
|
|
* If DCD is off and MDMBUF is changed, we must toggle TS_TTSTOP.
|
|
* XXX should be done at tty layer.
|
|
*/
|
|
if ((sc->sc_swflags & COM_SW_SOFTCAR) == 0 &&
|
|
(sc->sc_msr & MSR_DCD) == 0 &&
|
|
(tp->t_cflag & MDMBUF) != (t->c_cflag & MDMBUF)) {
|
|
if ((t->c_cflag & MDMBUF) == 0) {
|
|
tp->t_state &= ~TS_TTSTOP;
|
|
(*linesw[tp->t_line].l_start)(tp);
|
|
} else
|
|
tp->t_state |= TS_TTSTOP;
|
|
}
|
|
|
|
/* and copy to tty */
|
|
tp->t_ispeed = t->c_ispeed;
|
|
tp->t_ospeed = t->c_ospeed;
|
|
tp->t_cflag = t->c_cflag;
|
|
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
comstart(tp)
|
|
struct tty *tp;
|
|
{
|
|
struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)];
|
|
int iobase = sc->sc_iobase;
|
|
int s;
|
|
|
|
s = spltty();
|
|
if (tp->t_state & (TS_TTSTOP | TS_BUSY))
|
|
goto out;
|
|
#if 0 /* XXXX I think this is handled adequately by commint() and comparam(). */
|
|
if (tp->t_cflag & CRTSCTS && (sc->sc_mcr & MSR_CTS) == 0)
|
|
goto out;
|
|
#endif
|
|
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;
|
|
tp->t_state |= TS_BUSY;
|
|
if ((inb(iobase + com_lsr) & LSR_TXRDY) == 0)
|
|
goto out;
|
|
if (sc->sc_hwflags & COM_HW_FIFO) {
|
|
u_char buffer[16], *cp = buffer;
|
|
int n = q_to_b(&tp->t_outq, cp, sizeof buffer);
|
|
do {
|
|
outb(iobase + com_data, *cp++);
|
|
} while (--n);
|
|
} else
|
|
outb(iobase + com_data, getc(&tp->t_outq));
|
|
out:
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Stop output on a line.
|
|
*/
|
|
void
|
|
comstop(tp, flag)
|
|
struct tty *tp;
|
|
{
|
|
int s;
|
|
|
|
s = spltty();
|
|
if (tp->t_state & TS_BUSY)
|
|
if ((tp->t_state & TS_TTSTOP) == 0)
|
|
tp->t_state |= TS_FLUSH;
|
|
splx(s);
|
|
}
|
|
|
|
static inline void
|
|
comeint(sc, stat)
|
|
struct com_softc *sc;
|
|
int stat;
|
|
{
|
|
struct tty *tp = sc->sc_tty;
|
|
int iobase = sc->sc_iobase;
|
|
int c;
|
|
|
|
c = inb(iobase + com_data);
|
|
if ((tp->t_state & TS_ISOPEN) == 0) {
|
|
#ifdef KGDB
|
|
/* we don't care about parity errors */
|
|
if (((stat & (LSR_BI | LSR_FE | LSR_PE)) == LSR_PE) &&
|
|
kgdb_dev == makedev(commajor, unit) && c == FRAME_END)
|
|
kgdb_connect(0); /* trap into kgdb */
|
|
#endif
|
|
return;
|
|
}
|
|
#ifdef COMCONSOLE
|
|
if ((stat & LSR_BI) && (sc->sc_dev.dv_unit == comconsole))
|
|
Debugger();
|
|
#endif
|
|
if (stat & (LSR_BI | LSR_FE))
|
|
c |= TTY_FE;
|
|
else if (stat & LSR_PE)
|
|
c |= TTY_PE;
|
|
if (stat & LSR_OE) {
|
|
if (sc->sc_overflows++ == 0)
|
|
timeout(comdiag, sc, 60 * hz);
|
|
}
|
|
/* XXXX put in FIFO and process later */
|
|
(*linesw[tp->t_line].l_rint)(c, tp);
|
|
}
|
|
|
|
static inline void
|
|
commint(sc)
|
|
struct com_softc *sc;
|
|
{
|
|
struct tty *tp = sc->sc_tty;
|
|
int iobase = sc->sc_iobase;
|
|
u_char msr, delta;
|
|
|
|
msr = inb(iobase + com_msr);
|
|
delta = msr ^ sc->sc_msr;
|
|
sc->sc_msr = msr;
|
|
|
|
if (delta & MSR_DCD && (sc->sc_swflags & COM_SW_SOFTCAR) == 0) {
|
|
if (msr & MSR_DCD)
|
|
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
|
|
else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
|
|
outb(iobase + com_mcr,
|
|
sc->sc_mcr &= ~(MCR_DTR | MCR_RTS));
|
|
}
|
|
if (delta & MSR_CTS && tp->t_cflag & CRTSCTS) {
|
|
/* the line is up and we want to do rts/cts flow control */
|
|
if (msr & MSR_CTS) {
|
|
tp->t_state &= ~TS_TTSTOP;
|
|
(*linesw[tp->t_line].l_start)(tp);
|
|
} else
|
|
tp->t_state |= TS_TTSTOP;
|
|
}
|
|
}
|
|
|
|
void
|
|
comdiag(arg)
|
|
void *arg;
|
|
{
|
|
struct com_softc *sc = arg;
|
|
int overflows;
|
|
int s;
|
|
|
|
s = spltty();
|
|
overflows = sc->sc_overflows;
|
|
sc->sc_overflows = 0;
|
|
splx(s);
|
|
|
|
if (overflows)
|
|
log(LOG_WARNING, "%s: %d silo overflow%s\n",
|
|
sc->sc_dev.dv_xname, overflows, overflows == 1 ? "" : "s");
|
|
}
|
|
|
|
int
|
|
comintr(arg)
|
|
void *arg;
|
|
{
|
|
struct com_softc *sc = arg;
|
|
int iobase = sc->sc_iobase;
|
|
struct tty *tp;
|
|
u_char code;
|
|
|
|
code = inb(iobase + com_iir) & IIR_IMASK;
|
|
if (code & IIR_NOPEND)
|
|
return 0;
|
|
|
|
for (;;) {
|
|
if (code & IIR_RXRDY) {
|
|
tp = sc->sc_tty;
|
|
/* XXXX put in FIFO and process later */
|
|
while (code = (inb(iobase + com_lsr) & LSR_RCV_MASK)) {
|
|
if (code & LSR_RXRDY) {
|
|
code = inb(iobase + com_data);
|
|
if (tp->t_state & TS_ISOPEN)
|
|
(*linesw[tp->t_line].l_rint)(code, tp);
|
|
#ifdef KGDB
|
|
else {
|
|
if (kgdb_dev == makedev(commajor, unit) &&
|
|
code == FRAME_END)
|
|
kgdb_connect(0);
|
|
}
|
|
#endif
|
|
} else
|
|
comeint(sc, code);
|
|
}
|
|
} else if (code == IIR_TXRDY) {
|
|
tp = sc->sc_tty;
|
|
tp->t_state &= ~TS_BUSY;
|
|
if (tp->t_state & TS_FLUSH)
|
|
tp->t_state &= ~TS_FLUSH;
|
|
else
|
|
if (tp->t_line)
|
|
(*linesw[tp->t_line].l_start)(tp);
|
|
else
|
|
comstart(tp);
|
|
} else if (code == IIR_MLSC) {
|
|
commint(sc);
|
|
} else {
|
|
log(LOG_WARNING, "%s: weird interrupt: iir=0x%02x\n",
|
|
sc->sc_dev.dv_xname, code);
|
|
}
|
|
code = inb(iobase + com_iir) & IIR_IMASK;
|
|
if (code & IIR_NOPEND)
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Following are all routines needed for COM to act as console
|
|
*/
|
|
#include <dev/cons.h>
|
|
|
|
void
|
|
comcnprobe(cp)
|
|
struct consdev *cp;
|
|
{
|
|
|
|
if (!comprobe1(CONADDR)) {
|
|
cp->cn_pri = CN_DEAD;
|
|
return;
|
|
}
|
|
|
|
/* locate the major number */
|
|
for (commajor = 0; commajor < nchrdev; commajor++)
|
|
if (cdevsw[commajor].d_open == comopen)
|
|
break;
|
|
|
|
/* initialize required fields */
|
|
cp->cn_dev = makedev(commajor, CONUNIT);
|
|
#ifdef COMCONSOLE
|
|
cp->cn_pri = CN_REMOTE; /* Force a serial port console */
|
|
#else
|
|
cp->cn_pri = CN_NORMAL;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
comcninit(cp)
|
|
struct consdev *cp;
|
|
{
|
|
|
|
cominit(CONUNIT, comdefaultrate);
|
|
comconsole = CONUNIT;
|
|
comconsinit = 0;
|
|
}
|
|
|
|
cominit(unit, rate)
|
|
int unit, rate;
|
|
{
|
|
int s = splhigh();
|
|
int iobase = CONADDR;
|
|
u_char stat;
|
|
|
|
outb(iobase + com_cfcr, CFCR_DLAB);
|
|
rate = comspeed(comdefaultrate);
|
|
outb(iobase + com_dlbl, rate);
|
|
outb(iobase + com_dlbh, rate >> 8);
|
|
outb(iobase + com_cfcr, CFCR_8BITS);
|
|
outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY);
|
|
outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_4);
|
|
stat = inb(iobase + com_iir);
|
|
splx(s);
|
|
}
|
|
|
|
comcngetc(dev)
|
|
dev_t dev;
|
|
{
|
|
int s = splhigh();
|
|
int iobase = CONADDR;
|
|
u_char stat, c;
|
|
|
|
while (((stat = inb(iobase + com_lsr)) & LSR_RXRDY) == 0)
|
|
;
|
|
c = inb(iobase + com_data);
|
|
stat = inb(iobase + com_iir);
|
|
splx(s);
|
|
return c;
|
|
}
|
|
|
|
/*
|
|
* Console kernel output character routine.
|
|
*/
|
|
void
|
|
comcnputc(dev, c)
|
|
dev_t dev;
|
|
int c;
|
|
{
|
|
int s = splhigh();
|
|
int iobase = CONADDR;
|
|
u_char stat;
|
|
register int timo;
|
|
|
|
#ifdef KGDB
|
|
if (dev != kgdb_dev)
|
|
#endif
|
|
if (comconsinit == 0) {
|
|
(void) cominit(COMUNIT(dev), comdefaultrate);
|
|
comconsinit = 1;
|
|
}
|
|
/* wait for any pending transmission to finish */
|
|
timo = 50000;
|
|
while (((stat = inb(iobase + com_lsr)) & LSR_TXRDY) == 0 && --timo)
|
|
;
|
|
outb(iobase + com_data, c);
|
|
/* wait for this transmission to complete */
|
|
timo = 1500000;
|
|
while (((stat = inb(iobase + com_lsr)) & LSR_TXRDY) == 0 && --timo)
|
|
;
|
|
/* clear any interrupts generated by this transmission */
|
|
stat = inb(iobase + com_iir);
|
|
splx(s);
|
|
}
|
|
|
|
void
|
|
comcnpollc(dev, on)
|
|
dev_t dev;
|
|
int on;
|
|
{
|
|
|
|
}
|