1605 lines
36 KiB
C
1605 lines
36 KiB
C
/* $NetBSD: com.c,v 1.99 1997/04/04 20:56:34 mycroft Exp $ */
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/*-
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* Copyright (c) 1993, 1994, 1995, 1996, 1997
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* Charles M. Hannum. All rights reserved.
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*
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* Interrupt processing and hardware flow control partly based on code from
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* Onno van der Linden and Gordon Ross.
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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 Charles M. Hannum.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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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, 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/intr.h>
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#include <machine/bus.h>
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#include <dev/isa/comreg.h>
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#include <dev/isa/comvar.h>
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#include <dev/ic/ns16550reg.h>
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#ifdef COM_HAYESP
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#include <dev/ic/hayespreg.h>
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#endif
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#define com_lcr com_cfcr
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#include "com.h"
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#ifdef COM_HAYESP
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int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc));
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#endif
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#ifdef KGDB
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void com_kgdb_attach __P((struct com_softc *, bus_space_tag_t,
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bus_space_handle_t));
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#endif
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void com_attach_subr __P((struct com_softc *sc));
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void comdiag __P((void *));
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int comspeed __P((long));
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int comparam __P((struct tty *, struct termios *));
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void comstart __P((struct tty *));
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void comstop __P((struct tty *, int));
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#ifdef __GENERIC_SOFT_INTERRUPTS
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void comsoft __P((void *));
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#else
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#ifndef alpha
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void comsoft __P((void));
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#else
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void comsoft __P((void *));
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#endif
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#endif
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int comhwiflow __P((struct tty *, int));
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void com_loadchannelregs __P((struct com_softc *));
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void com_hwiflow __P((struct com_softc *, int));
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void com_break __P((struct com_softc *, int));
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void com_modem __P((struct com_softc *, int));
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void com_iflush __P((struct com_softc *));
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/* XXX: These belong elsewhere */
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cdev_decl(com);
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bdev_decl(com);
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struct consdev;
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void comcnprobe __P((struct consdev *));
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void comcninit __P((struct consdev *));
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int comcngetc __P((dev_t));
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void comcnputc __P((dev_t, int));
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void comcnpollc __P((dev_t, int));
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#define integrate static inline
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integrate void comrxint __P((struct com_softc *, struct tty *));
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integrate void comtxint __P((struct com_softc *, struct tty *));
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integrate void commsrint __P((struct com_softc *, struct tty *));
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struct cfdriver com_cd = {
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NULL, "com", DV_TTY
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};
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void cominitcons __P((bus_space_tag_t, bus_space_handle_t, int));
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#ifdef CONSPEED
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int comconsrate = CONSPEED;
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#else
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int comconsrate = TTYDEF_SPEED;
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#endif
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int comconsaddr;
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int comconsattached;
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bus_space_tag_t comconstag;
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bus_space_handle_t comconsioh;
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tcflag_t comconscflag = TTYDEF_CFLAG;
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int commajor;
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#ifndef __GENERIC_SOFT_INTERRUPTS
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#ifdef alpha
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volatile int com_softintr_scheduled;
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#endif
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#endif
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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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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 0
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if (speed == 0)
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return (0);
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#endif
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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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#ifdef COM_DEBUG
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void comstatus __P((struct com_softc *, char *));
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void
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comstatus(sc, str)
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struct com_softc *sc;
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char *str;
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{
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struct tty *tp = sc->sc_tty;
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printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n",
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sc->sc_dev.dv_xname, str,
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ISSET(tp->t_cflag, CLOCAL) ? "+" : "-",
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ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-",
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ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-",
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ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-",
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sc->sc_tx_stopped ? "+" : "-");
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printf("%s: %s %scrtscts %scts %sts_ttstop %srts %srx_blocked\n",
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sc->sc_dev.dv_xname, str,
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ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-",
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ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-",
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ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-",
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ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-",
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sc->sc_rx_blocked ? "+" : "-");
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}
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#endif
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int
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comprobe1(iot, ioh, iobase)
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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int iobase;
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{
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/* force access to id reg */
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bus_space_write_1(iot, ioh, com_lcr, 0);
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bus_space_write_1(iot, ioh, com_iir, 0);
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if (bus_space_read_1(iot, ioh, com_iir) & 0x38)
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return (0);
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return (1);
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}
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#ifdef COM_HAYESP
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int
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comprobeHAYESP(hayespioh, sc)
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bus_space_handle_t hayespioh;
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struct com_softc *sc;
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{
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char val, dips;
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int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
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bus_space_tag_t iot = sc->sc_iot;
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/*
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* Hayes ESP cards have two iobases. One is for compatibility with
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* 16550 serial chips, and at the same ISA PC base addresses. The
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* other is for ESP-specific enhanced features, and lies at a
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* different addressing range entirely (0x140, 0x180, 0x280, or 0x300).
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*/
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/* Test for ESP signature */
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if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0)
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return (0);
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/*
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* ESP is present at ESP enhanced base address; unknown com port
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*/
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/* Get the dip-switch configurations */
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bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS);
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dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1);
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/* Determine which com port this ESP card services: bits 0,1 of */
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/* dips is the port # (0-3); combaselist[val] is the com_iobase */
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if (sc->sc_iobase != combaselist[dips & 0x03])
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return (0);
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printf(": ESP");
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/* Check ESP Self Test bits. */
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/* Check for ESP version 2.0: bits 4,5,6 == 010 */
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bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST);
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val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */
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val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2);
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if ((val & 0x70) < 0x20) {
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printf("-old (%o)", val & 0x70);
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/* we do not support the necessary features */
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return (0);
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}
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/* Check for ability to emulate 16550: bit 8 == 1 */
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if ((dips & 0x80) == 0) {
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printf(" slave");
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/* XXX Does slave really mean no 16550 support?? */
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return (0);
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}
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/*
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* If we made it this far, we are a full-featured ESP v2.0 (or
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* better), at the correct com port address.
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*/
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SET(sc->sc_hwflags, COM_HW_HAYESP);
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printf(", 1024 byte fifo\n");
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return (1);
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}
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#endif
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#ifdef KGDB
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void
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com_kgdb_attach(sc, iot, ioh)
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struct com_softc *sc;
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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{
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if (kgdb_dev == makedev(commajor, unit)) {
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if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
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kgdb_dev = -1; /* can't debug over console port */
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else {
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cominitcons(iot, ioh, 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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}
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#endif
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void
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com_attach_subr(sc)
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struct com_softc *sc;
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{
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int iobase = sc->sc_iobase;
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bus_space_tag_t iot = sc->sc_iot;
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bus_space_handle_t ioh = sc->sc_ioh;
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#ifdef COM_HAYESP
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int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 };
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int *hayespp;
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#endif
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if (iobase == comconsaddr) {
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comconsattached = 1;
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/* Make sure the console is always "hardwired". */
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delay(1000); /* wait for output to finish */
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SET(sc->sc_hwflags, COM_HW_CONSOLE);
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SET(sc->sc_swflags, TIOCFLAG_SOFTCAR);
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}
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#ifdef COM_HAYESP
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/* Look for a Hayes ESP board. */
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for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) {
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bus_space_handle_t hayespioh;
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#define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */
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if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh))
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continue;
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if (comprobeHAYESP(hayespioh, sc)) {
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sc->sc_hayespioh = hayespioh;
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sc->sc_fifolen = 1024;
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/* Set 16550 compatibility mode */
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bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETMODE);
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bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
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HAYESP_MODE_FIFO|HAYESP_MODE_RTS|
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HAYESP_MODE_SCALE);
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/* Set RTS/CTS flow control */
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bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETFLOWTYPE);
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bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_RTS);
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bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_CTS);
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/* Set flow control levels */
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bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETRXFLOW);
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bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
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HAYESP_HIBYTE(HAYESP_RXHIWMARK));
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bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
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HAYESP_LOBYTE(HAYESP_RXHIWMARK));
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bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
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HAYESP_HIBYTE(HAYESP_RXLOWMARK));
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bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
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HAYESP_LOBYTE(HAYESP_RXLOWMARK));
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break;
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}
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bus_space_unmap(iot, hayespioh, HAYESP_NPORTS);
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}
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/* No ESP; look for other things. */
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if (*hayespp == 0) {
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#endif
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sc->sc_fifolen = 1;
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/* look for a NS 16550AF UART with FIFOs */
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bus_space_write_1(iot, ioh, 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 (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK)
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== IIR_FIFO_MASK)
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if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14)
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== FIFO_TRIGGER_14) {
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SET(sc->sc_hwflags, COM_HW_FIFO);
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printf(": ns16550a, working fifo\n");
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sc->sc_fifolen = 16;
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} else
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printf(": ns16550, broken fifo\n");
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else
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printf(": ns8250 or ns16450, no fifo\n");
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bus_space_write_1(iot, ioh, com_fifo, 0);
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#ifdef COM_HAYESP
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}
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#endif
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if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN))
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SET(sc->sc_mcr, MCR_IENABLE);
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if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
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cominit(iot, ioh, comconsrate);
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printf("%s: console\n", sc->sc_dev.dv_xname);
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}
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#ifdef KGDB
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com_kgdb_attach(sc, iot, ioh);
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#endif
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#ifdef __GENERIC_SOFT_INTERRUPTS
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sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc);
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#endif
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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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struct tty *tp;
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int s, s2;
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int error = 0;
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if (unit >= com_cd.cd_ndevs)
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return (ENXIO);
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sc = com_cd.cd_devs[unit];
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if (!sc)
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return (ENXIO);
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if (!sc->sc_tty) {
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tp = sc->sc_tty = ttymalloc();
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tty_attach(tp);
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} else
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tp = sc->sc_tty;
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if (ISSET(tp->t_state, TS_ISOPEN) &&
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ISSET(tp->t_state, TS_XCLUDE) &&
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p->p_ucred->cr_uid != 0)
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return (EBUSY);
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s = spltty();
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|
|
/* We need to set this early for the benefit of comsoft(). */
|
|
SET(tp->t_state, TS_WOPEN);
|
|
|
|
/*
|
|
* Do the following iff this is a first open.
|
|
*/
|
|
if (!ISSET(tp->t_state, TS_ISOPEN)) {
|
|
struct termios t;
|
|
|
|
/* Turn on interrupts. */
|
|
sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC;
|
|
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier);
|
|
|
|
/* Fetch the current modem control status, needed later. */
|
|
sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr);
|
|
|
|
/* Add some entry points needed by the tty layer. */
|
|
tp->t_oproc = comstart;
|
|
tp->t_param = comparam;
|
|
tp->t_hwiflow = comhwiflow;
|
|
tp->t_dev = dev;
|
|
|
|
/*
|
|
* Initialize the termios status to the defaults. Add in the
|
|
* sticky bits from TIOCSFLAGS.
|
|
*/
|
|
t.c_ispeed = 0;
|
|
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
|
|
t.c_ospeed = comconsrate;
|
|
t.c_cflag = comconscflag;
|
|
} else {
|
|
t.c_ospeed = TTYDEF_SPEED;
|
|
t.c_cflag = TTYDEF_CFLAG;
|
|
}
|
|
if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL))
|
|
SET(t.c_cflag, CLOCAL);
|
|
if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS))
|
|
SET(t.c_cflag, CRTSCTS);
|
|
if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF))
|
|
SET(t.c_cflag, MDMBUF);
|
|
tp->t_iflag = TTYDEF_IFLAG;
|
|
tp->t_oflag = TTYDEF_OFLAG;
|
|
tp->t_lflag = TTYDEF_LFLAG;
|
|
ttychars(tp);
|
|
(void) comparam(tp, &t);
|
|
ttsetwater(tp);
|
|
|
|
s2 = splserial();
|
|
|
|
/*
|
|
* Turn on DTR. We must always do this, even if carrier is not
|
|
* present, because otherwise we'd have to use TIOCSDTR
|
|
* immediately after setting CLOCAL. We will drop DTR only on
|
|
* the next high-low transition of DCD, or by explicit request.
|
|
*/
|
|
com_modem(sc, 1);
|
|
|
|
/* Clear the input ring, and unblock. */
|
|
sc->sc_rbput = sc->sc_rbget = 0;
|
|
sc->sc_rbavail = RXBUFSIZE;
|
|
com_iflush(sc);
|
|
sc->sc_rx_blocked = 0;
|
|
com_hwiflow(sc, 0);
|
|
|
|
#ifdef COM_DEBUG
|
|
comstatus(sc, "comopen ");
|
|
#endif
|
|
|
|
splx(s2);
|
|
}
|
|
error = 0;
|
|
|
|
/* If we're doing a blocking open... */
|
|
if (!ISSET(flag, O_NONBLOCK))
|
|
/* ...then wait for carrier. */
|
|
while (!ISSET(tp->t_state, TS_CARR_ON) &&
|
|
!ISSET(tp->t_cflag, CLOCAL | MDMBUF)) {
|
|
error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
|
|
ttopen, 0);
|
|
if (error) {
|
|
/*
|
|
* If the open was interrupted and nobody
|
|
* else has the device open, then hang up.
|
|
*/
|
|
if (!ISSET(tp->t_state, TS_ISOPEN)) {
|
|
com_modem(sc, 0);
|
|
CLR(tp->t_state, TS_WOPEN);
|
|
ttwakeup(tp);
|
|
}
|
|
break;
|
|
}
|
|
SET(tp->t_state, TS_WOPEN);
|
|
}
|
|
|
|
splx(s);
|
|
if (error == 0)
|
|
error = (*linesw[tp->t_line].l_open)(dev, tp);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
comclose(dev, flag, mode, p)
|
|
dev_t dev;
|
|
int flag, mode;
|
|
struct proc *p;
|
|
{
|
|
int unit = COMUNIT(dev);
|
|
struct com_softc *sc = com_cd.cd_devs[unit];
|
|
struct tty *tp = sc->sc_tty;
|
|
int s;
|
|
|
|
/* XXX This is for cons.c. */
|
|
if (!ISSET(tp->t_state, TS_ISOPEN))
|
|
return (0);
|
|
|
|
(*linesw[tp->t_line].l_close)(tp, flag);
|
|
ttyclose(tp);
|
|
|
|
/* If we were asserting flow control, then deassert it. */
|
|
sc->sc_rx_blocked = 1;
|
|
com_hwiflow(sc, 1);
|
|
/* Clear any break condition set with TIOCSBRK. */
|
|
com_break(sc, 0);
|
|
/*
|
|
* Hang up if necessary. Wait a bit, so the other side has time to
|
|
* notice even if we immediately open the port again.
|
|
*/
|
|
if (ISSET(tp->t_cflag, HUPCL)) {
|
|
com_modem(sc, 0);
|
|
(void) tsleep(sc, TTIPRI, ttclos, hz);
|
|
}
|
|
|
|
s = splserial();
|
|
/* Turn off interrupts. */
|
|
sc->sc_ier = 0;
|
|
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier);
|
|
splx(s);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
comread(dev, uio, flag)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)];
|
|
struct tty *tp = sc->sc_tty;
|
|
|
|
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
|
|
}
|
|
|
|
int
|
|
comwrite(dev, uio, flag)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)];
|
|
struct tty *tp = sc->sc_tty;
|
|
|
|
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
|
|
}
|
|
|
|
struct tty *
|
|
comtty(dev)
|
|
dev_t dev;
|
|
{
|
|
struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)];
|
|
struct tty *tp = sc->sc_tty;
|
|
|
|
return (tp);
|
|
}
|
|
|
|
int
|
|
comioctl(dev, cmd, data, flag, p)
|
|
dev_t dev;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
int flag;
|
|
struct proc *p;
|
|
{
|
|
int unit = COMUNIT(dev);
|
|
struct com_softc *sc = com_cd.cd_devs[unit];
|
|
struct tty *tp = sc->sc_tty;
|
|
int error;
|
|
|
|
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
|
|
if (error >= 0)
|
|
return (error);
|
|
|
|
error = ttioctl(tp, cmd, data, flag, p);
|
|
if (error >= 0)
|
|
return (error);
|
|
|
|
switch (cmd) {
|
|
case TIOCSBRK:
|
|
com_break(sc, 1);
|
|
break;
|
|
|
|
case TIOCCBRK:
|
|
com_break(sc, 0);
|
|
break;
|
|
|
|
case TIOCSDTR:
|
|
com_modem(sc, 1);
|
|
break;
|
|
|
|
case TIOCCDTR:
|
|
com_modem(sc, 0);
|
|
break;
|
|
|
|
case TIOCGFLAGS:
|
|
*(int *)data = sc->sc_swflags;
|
|
break;
|
|
|
|
case TIOCSFLAGS:
|
|
error = suser(p->p_ucred, &p->p_acflag);
|
|
if (error)
|
|
return (error);
|
|
sc->sc_swflags = *(int *)data;
|
|
break;
|
|
|
|
case TIOCMSET:
|
|
case TIOCMBIS:
|
|
case TIOCMBIC:
|
|
case TIOCMGET:
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
|
|
#ifdef COM_DEBUG
|
|
comstatus(sc, "comioctl ");
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
com_break(sc, onoff)
|
|
struct com_softc *sc;
|
|
int onoff;
|
|
{
|
|
int s;
|
|
|
|
s = splserial();
|
|
if (onoff)
|
|
SET(sc->sc_lcr, LCR_SBREAK);
|
|
else
|
|
CLR(sc->sc_lcr, LCR_SBREAK);
|
|
|
|
if (!sc->sc_heldchange) {
|
|
if (sc->sc_tx_busy) {
|
|
sc->sc_heldtbc = sc->sc_tbc;
|
|
sc->sc_tbc = 0;
|
|
sc->sc_heldchange = 1;
|
|
} else
|
|
com_loadchannelregs(sc);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
void
|
|
com_modem(sc, onoff)
|
|
struct com_softc *sc;
|
|
int onoff;
|
|
{
|
|
int s;
|
|
|
|
s = splserial();
|
|
if (onoff)
|
|
SET(sc->sc_mcr, sc->sc_mcr_dtr);
|
|
else
|
|
CLR(sc->sc_mcr, sc->sc_mcr_dtr);
|
|
|
|
if (!sc->sc_heldchange) {
|
|
if (sc->sc_tx_busy) {
|
|
sc->sc_heldtbc = sc->sc_tbc;
|
|
sc->sc_tbc = 0;
|
|
sc->sc_heldchange = 1;
|
|
} else
|
|
com_loadchannelregs(sc);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
int
|
|
comparam(tp, t)
|
|
struct tty *tp;
|
|
struct termios *t;
|
|
{
|
|
struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)];
|
|
int ospeed = comspeed(t->c_ospeed);
|
|
u_char lcr;
|
|
int s;
|
|
|
|
/* check requested parameters */
|
|
if (ospeed < 0)
|
|
return (EINVAL);
|
|
if (t->c_ispeed && t->c_ispeed != t->c_ospeed)
|
|
return (EINVAL);
|
|
|
|
lcr = ISSET(sc->sc_lcr, LCR_SBREAK);
|
|
|
|
switch (ISSET(t->c_cflag, CSIZE)) {
|
|
case CS5:
|
|
SET(lcr, LCR_5BITS);
|
|
break;
|
|
case CS6:
|
|
SET(lcr, LCR_6BITS);
|
|
break;
|
|
case CS7:
|
|
SET(lcr, LCR_7BITS);
|
|
break;
|
|
case CS8:
|
|
SET(lcr, LCR_8BITS);
|
|
break;
|
|
}
|
|
if (ISSET(t->c_cflag, PARENB)) {
|
|
SET(lcr, LCR_PENAB);
|
|
if (!ISSET(t->c_cflag, PARODD))
|
|
SET(lcr, LCR_PEVEN);
|
|
}
|
|
if (ISSET(t->c_cflag, CSTOPB))
|
|
SET(lcr, LCR_STOPB);
|
|
|
|
s = splserial();
|
|
|
|
sc->sc_lcr = lcr;
|
|
|
|
/*
|
|
* For the console, always force CLOCAL and !HUPCL, so that the port
|
|
* is always active.
|
|
*/
|
|
if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) ||
|
|
ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
|
|
SET(t->c_cflag, CLOCAL);
|
|
CLR(t->c_cflag, HUPCL);
|
|
}
|
|
|
|
/*
|
|
* If we're not in a mode that assumes a connection is present, then
|
|
* ignore carrier changes.
|
|
*/
|
|
if (ISSET(t->c_cflag, CLOCAL | MDMBUF))
|
|
sc->sc_msr_dcd = 0;
|
|
else
|
|
sc->sc_msr_dcd = MSR_DCD;
|
|
/*
|
|
* Set the flow control pins depending on the current flow control
|
|
* mode.
|
|
*/
|
|
if (ISSET(t->c_cflag, CRTSCTS)) {
|
|
sc->sc_mcr_dtr = MCR_DTR;
|
|
sc->sc_mcr_rts = MCR_RTS;
|
|
sc->sc_msr_cts = MSR_CTS;
|
|
sc->sc_r_hiwat = RXHIWAT;
|
|
} else if (ISSET(t->c_cflag, MDMBUF)) {
|
|
/*
|
|
* For DTR/DCD flow control, make sure we don't toggle DTR for
|
|
* carrier detection.
|
|
*/
|
|
sc->sc_mcr_dtr = 0;
|
|
sc->sc_mcr_rts = MCR_DTR;
|
|
sc->sc_msr_cts = MSR_DCD;
|
|
sc->sc_r_hiwat = RXHIWAT;
|
|
} else {
|
|
/*
|
|
* If no flow control, then always set RTS. This will make
|
|
* the other side happy if it mistakenly thinks we're doing
|
|
* RTS/CTS flow control.
|
|
*/
|
|
sc->sc_mcr_dtr = MCR_DTR | MCR_RTS;
|
|
sc->sc_mcr_rts = 0;
|
|
sc->sc_msr_cts = 0;
|
|
sc->sc_r_hiwat = 0;
|
|
if (ISSET(sc->sc_mcr, MCR_DTR))
|
|
SET(sc->sc_mcr, MCR_RTS);
|
|
else
|
|
CLR(sc->sc_mcr, MCR_RTS);
|
|
}
|
|
sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd;
|
|
|
|
#if 0
|
|
if (ospeed == 0)
|
|
CLR(sc->sc_mcr, sc->sc_mcr_dtr);
|
|
else
|
|
SET(sc->sc_mcr, sc->sc_mcr_dtr);
|
|
#endif
|
|
|
|
sc->sc_dlbl = ospeed;
|
|
sc->sc_dlbh = ospeed >> 8;
|
|
|
|
/*
|
|
* Set the FIFO threshold based on the receive speed.
|
|
*
|
|
* * If it's a low speed, it's probably a mouse or some other
|
|
* interactive device, so set the threshold low.
|
|
* * If it's a high speed, trim the trigger level down to prevent
|
|
* overflows.
|
|
* * Otherwise set it a bit higher.
|
|
*/
|
|
if (ISSET(sc->sc_hwflags, COM_HW_HAYESP))
|
|
sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8;
|
|
else if (ISSET(sc->sc_hwflags, COM_HW_FIFO))
|
|
sc->sc_fifo = FIFO_ENABLE |
|
|
(t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 :
|
|
t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4);
|
|
else
|
|
sc->sc_fifo = 0;
|
|
|
|
/* and copy to tty */
|
|
tp->t_ispeed = 0;
|
|
tp->t_ospeed = t->c_ospeed;
|
|
tp->t_cflag = t->c_cflag;
|
|
|
|
if (!sc->sc_heldchange) {
|
|
if (sc->sc_tx_busy) {
|
|
sc->sc_heldtbc = sc->sc_tbc;
|
|
sc->sc_tbc = 0;
|
|
sc->sc_heldchange = 1;
|
|
} else
|
|
com_loadchannelregs(sc);
|
|
}
|
|
|
|
splx(s);
|
|
|
|
/*
|
|
* Update the tty layer's idea of the carrier bit, in case we changed
|
|
* CLOCAL or MDMBUF. We don't hang up here; we only do that if we
|
|
* lose carrier while carrier detection is on.
|
|
*/
|
|
(void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD));
|
|
|
|
#ifdef COM_DEBUG
|
|
comstatus(sc, "comparam ");
|
|
#endif
|
|
|
|
/* XXXXX FIX ME */
|
|
/* Block or unblock as needed. */
|
|
if (!ISSET(t->c_cflag, CHWFLOW)) {
|
|
if (sc->sc_rx_blocked) {
|
|
sc->sc_rx_blocked = 0;
|
|
com_hwiflow(sc, 0);
|
|
}
|
|
if (sc->sc_tx_stopped) {
|
|
sc->sc_tx_stopped = 0;
|
|
comstart(tp);
|
|
}
|
|
} else {
|
|
#if 0
|
|
commsrint(sc, tp);
|
|
#endif
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
com_iflush(sc)
|
|
struct com_softc *sc;
|
|
{
|
|
bus_space_tag_t iot = sc->sc_iot;
|
|
bus_space_handle_t ioh = sc->sc_ioh;
|
|
|
|
/* flush any pending I/O */
|
|
while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY))
|
|
(void) bus_space_read_1(iot, ioh, com_data);
|
|
}
|
|
|
|
void
|
|
com_loadchannelregs(sc)
|
|
struct com_softc *sc;
|
|
{
|
|
bus_space_tag_t iot = sc->sc_iot;
|
|
bus_space_handle_t ioh = sc->sc_ioh;
|
|
|
|
/* XXXXX necessary? */
|
|
com_iflush(sc);
|
|
|
|
bus_space_write_1(iot, ioh, com_ier, 0);
|
|
|
|
bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB);
|
|
bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl);
|
|
bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh);
|
|
bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr);
|
|
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr);
|
|
bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo);
|
|
|
|
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
|
|
}
|
|
|
|
int
|
|
comhwiflow(tp, block)
|
|
struct tty *tp;
|
|
int block;
|
|
{
|
|
struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)];
|
|
int s;
|
|
|
|
if (sc->sc_mcr_rts == 0)
|
|
return (0);
|
|
|
|
s = splserial();
|
|
if (block) {
|
|
/*
|
|
* The tty layer is asking us to block input.
|
|
* If we already did it, just return TRUE.
|
|
*/
|
|
if (sc->sc_rx_blocked)
|
|
goto out;
|
|
sc->sc_rx_blocked = 1;
|
|
} else {
|
|
/*
|
|
* The tty layer is asking us to resume input.
|
|
* The input ring is always empty by now.
|
|
*/
|
|
sc->sc_rx_blocked = 0;
|
|
}
|
|
com_hwiflow(sc, block);
|
|
out:
|
|
splx(s);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* (un)block input via hw flowcontrol
|
|
*/
|
|
void
|
|
com_hwiflow(sc, block)
|
|
struct com_softc *sc;
|
|
int block;
|
|
{
|
|
bus_space_tag_t iot = sc->sc_iot;
|
|
bus_space_handle_t ioh = sc->sc_ioh;
|
|
|
|
if (sc->sc_mcr_rts == 0)
|
|
return;
|
|
|
|
if (block) {
|
|
CLR(sc->sc_mcr, sc->sc_mcr_rts);
|
|
CLR(sc->sc_mcr_active, sc->sc_mcr_rts);
|
|
} else {
|
|
SET(sc->sc_mcr, sc->sc_mcr_rts);
|
|
SET(sc->sc_mcr_active, sc->sc_mcr_rts);
|
|
}
|
|
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active);
|
|
}
|
|
|
|
|
|
void
|
|
comstart(tp)
|
|
struct tty *tp;
|
|
{
|
|
struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)];
|
|
bus_space_tag_t iot = sc->sc_iot;
|
|
bus_space_handle_t ioh = sc->sc_ioh;
|
|
int s;
|
|
|
|
s = spltty();
|
|
if (ISSET(tp->t_state, TS_BUSY))
|
|
goto out;
|
|
if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP))
|
|
goto stopped;
|
|
|
|
if (sc->sc_tx_stopped)
|
|
goto stopped;
|
|
|
|
if (tp->t_outq.c_cc <= tp->t_lowat) {
|
|
if (ISSET(tp->t_state, TS_ASLEEP)) {
|
|
CLR(tp->t_state, TS_ASLEEP);
|
|
wakeup(&tp->t_outq);
|
|
}
|
|
selwakeup(&tp->t_wsel);
|
|
if (tp->t_outq.c_cc == 0)
|
|
goto stopped;
|
|
}
|
|
|
|
/* Grab the first contiguous region of buffer space. */
|
|
{
|
|
u_char *tba;
|
|
int tbc;
|
|
|
|
tba = tp->t_outq.c_cf;
|
|
tbc = ndqb(&tp->t_outq, 0);
|
|
|
|
(void)splserial();
|
|
|
|
sc->sc_tba = tba;
|
|
sc->sc_tbc = tbc;
|
|
}
|
|
|
|
SET(tp->t_state, TS_BUSY);
|
|
sc->sc_tx_busy = 1;
|
|
|
|
/* Enable transmit completion interrupts if necessary. */
|
|
if (!ISSET(sc->sc_ier, IER_ETXRDY)) {
|
|
SET(sc->sc_ier, IER_ETXRDY);
|
|
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
|
|
}
|
|
|
|
/* Output the first chunk of the contiguous buffer. */
|
|
{
|
|
int n;
|
|
|
|
n = sc->sc_fifolen;
|
|
if (n > sc->sc_tbc)
|
|
n = sc->sc_tbc;
|
|
bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n);
|
|
sc->sc_tbc -= n;
|
|
sc->sc_tba += n;
|
|
}
|
|
splx(s);
|
|
return;
|
|
|
|
stopped:
|
|
/* Disable transmit completion interrupts if necessary. */
|
|
if (ISSET(sc->sc_ier, IER_ETXRDY)) {
|
|
CLR(sc->sc_ier, IER_ETXRDY);
|
|
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
|
|
}
|
|
out:
|
|
splx(s);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Stop output on a line.
|
|
*/
|
|
void
|
|
comstop(tp, flag)
|
|
struct tty *tp;
|
|
int flag;
|
|
{
|
|
struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)];
|
|
int s;
|
|
|
|
s = splserial();
|
|
if (ISSET(tp->t_state, TS_BUSY)) {
|
|
/* Stop transmitting at the next chunk. */
|
|
sc->sc_tbc = 0;
|
|
sc->sc_heldtbc = 0;
|
|
if (!ISSET(tp->t_state, TS_TTSTOP))
|
|
SET(tp->t_state, TS_FLUSH);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
void
|
|
comdiag(arg)
|
|
void *arg;
|
|
{
|
|
struct com_softc *sc = arg;
|
|
int overflows, floods;
|
|
int s;
|
|
|
|
s = splserial();
|
|
overflows = sc->sc_overflows;
|
|
sc->sc_overflows = 0;
|
|
floods = sc->sc_floods;
|
|
sc->sc_floods = 0;
|
|
sc->sc_errors = 0;
|
|
splx(s);
|
|
|
|
log(LOG_WARNING,
|
|
"%s: %d silo overflow%s, %d ibuf flood%s\n",
|
|
sc->sc_dev.dv_xname,
|
|
overflows, overflows == 1 ? "" : "s",
|
|
floods, floods == 1 ? "" : "s");
|
|
}
|
|
|
|
integrate void
|
|
comrxint(sc, tp)
|
|
struct com_softc *sc;
|
|
struct tty *tp;
|
|
{
|
|
u_int get, cc, scc;
|
|
int code;
|
|
u_char lsr;
|
|
int s;
|
|
static int lsrmap[8] = {
|
|
0, TTY_PE,
|
|
TTY_FE, TTY_PE|TTY_FE,
|
|
TTY_FE, TTY_PE|TTY_FE,
|
|
TTY_FE, TTY_PE|TTY_FE
|
|
};
|
|
|
|
get = sc->sc_rbget;
|
|
scc = cc = RXBUFSIZE - sc->sc_rbavail;
|
|
|
|
if (cc == RXBUFSIZE) {
|
|
sc->sc_floods++;
|
|
if (sc->sc_errors++ == 0)
|
|
timeout(comdiag, sc, 60 * hz);
|
|
}
|
|
|
|
while (cc--) {
|
|
lsr = sc->sc_lbuf[get];
|
|
if (ISSET(lsr, LSR_BI)) {
|
|
#ifdef DDB
|
|
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
|
|
Debugger();
|
|
#endif
|
|
}
|
|
else if (ISSET(lsr, LSR_OE)) {
|
|
sc->sc_overflows++;
|
|
if (sc->sc_errors++ == 0)
|
|
timeout(comdiag, sc, 60 * hz);
|
|
}
|
|
code = sc->sc_rbuf[get] |
|
|
lsrmap[(lsr & (LSR_BI|LSR_FE|LSR_PE)) >> 2];
|
|
(*linesw[tp->t_line].l_rint)(code, tp);
|
|
get = (get + 1) & RXBUFMASK;
|
|
}
|
|
|
|
sc->sc_rbget = get;
|
|
s = splserial();
|
|
sc->sc_rbavail += scc;
|
|
/*
|
|
* Buffers should be ok again, release possible block, but only if the
|
|
* tty layer isn't blocking too.
|
|
*/
|
|
if (sc->sc_rx_blocked && !ISSET(tp->t_state, TS_TBLOCK)) {
|
|
sc->sc_rx_blocked = 0;
|
|
com_hwiflow(sc, 0);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
integrate void
|
|
comtxint(sc, tp)
|
|
struct com_softc *sc;
|
|
struct tty *tp;
|
|
{
|
|
|
|
CLR(tp->t_state, TS_BUSY);
|
|
if (ISSET(tp->t_state, TS_FLUSH))
|
|
CLR(tp->t_state, TS_FLUSH);
|
|
else
|
|
ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf));
|
|
(*linesw[tp->t_line].l_start)(tp);
|
|
}
|
|
|
|
integrate void
|
|
commsrint(sc, tp)
|
|
struct com_softc *sc;
|
|
struct tty *tp;
|
|
{
|
|
u_char msr, delta;
|
|
int s;
|
|
|
|
s = splserial();
|
|
msr = sc->sc_msr;
|
|
delta = sc->sc_msr_delta;
|
|
sc->sc_msr_delta = 0;
|
|
splx(s);
|
|
|
|
if (ISSET(delta, sc->sc_msr_dcd)) {
|
|
/*
|
|
* Inform the tty layer that carrier detect changed.
|
|
*/
|
|
(void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD));
|
|
}
|
|
|
|
if (ISSET(delta, sc->sc_msr_cts)) {
|
|
/* Block or unblock output according to flow control. */
|
|
if (ISSET(msr, sc->sc_msr_cts)) {
|
|
sc->sc_tx_stopped = 0;
|
|
(*linesw[tp->t_line].l_start)(tp);
|
|
} else {
|
|
sc->sc_tx_stopped = 1;
|
|
comstop(tp, 0);
|
|
}
|
|
}
|
|
|
|
#ifdef COM_DEBUG
|
|
comstatus(sc, "commsrint");
|
|
#endif
|
|
}
|
|
|
|
#ifdef __GENERIC_SOFT_INTERRUPTS
|
|
void
|
|
comsoft(arg)
|
|
void *arg;
|
|
{
|
|
struct com_softc *sc = arg;
|
|
struct tty *tp;
|
|
|
|
{
|
|
#else
|
|
void
|
|
#ifndef alpha
|
|
comsoft()
|
|
#else
|
|
comsoft(arg)
|
|
void *arg;
|
|
#endif
|
|
{
|
|
struct com_softc *sc;
|
|
struct tty *tp;
|
|
int unit;
|
|
#ifdef alpha
|
|
int s;
|
|
|
|
s = splsoftserial();
|
|
com_softintr_scheduled = 0;
|
|
#endif
|
|
|
|
for (unit = 0; unit < com_cd.cd_ndevs; unit++) {
|
|
sc = com_cd.cd_devs[unit];
|
|
if (sc == NULL)
|
|
continue;
|
|
#endif
|
|
|
|
tp = sc->sc_tty;
|
|
if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN))
|
|
continue;
|
|
|
|
if (sc->sc_rx_ready) {
|
|
sc->sc_rx_ready = 0;
|
|
comrxint(sc, tp);
|
|
}
|
|
|
|
if (sc->sc_st_check) {
|
|
sc->sc_st_check = 0;
|
|
commsrint(sc, tp);
|
|
}
|
|
|
|
if (sc->sc_tx_done) {
|
|
sc->sc_tx_done = 0;
|
|
comtxint(sc, tp);
|
|
}
|
|
}
|
|
|
|
#ifndef __GENERIC_SOFT_INTERRUPTS
|
|
#ifdef alpha
|
|
splx(s);
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
int
|
|
comintr(arg)
|
|
void *arg;
|
|
{
|
|
struct com_softc *sc = arg;
|
|
bus_space_tag_t iot = sc->sc_iot;
|
|
bus_space_handle_t ioh = sc->sc_ioh;
|
|
u_char lsr, iir;
|
|
u_int put, cc;
|
|
|
|
iir = bus_space_read_1(iot, ioh, com_iir);
|
|
if (ISSET(iir, IIR_NOPEND))
|
|
return (0);
|
|
|
|
put = sc->sc_rbput;
|
|
cc = sc->sc_rbavail;
|
|
|
|
do {
|
|
u_char msr, delta;
|
|
|
|
lsr = bus_space_read_1(iot, ioh, com_lsr);
|
|
if (ISSET(lsr, LSR_RCV_MASK)) {
|
|
for (; ISSET(lsr, LSR_RCV_MASK) && cc > 0; cc--) {
|
|
sc->sc_rbuf[put] =
|
|
bus_space_read_1(iot, ioh, com_data);
|
|
sc->sc_lbuf[put] = lsr;
|
|
put = (put + 1) & RXBUFMASK;
|
|
lsr = bus_space_read_1(iot, ioh, com_lsr);
|
|
}
|
|
/*
|
|
* Current string of incoming characters ended because
|
|
* no more data was available. Schedule a receive event
|
|
* if any data was received. Drop any characters that
|
|
* we couldn't handle.
|
|
*/
|
|
sc->sc_rbput = put;
|
|
sc->sc_rbavail = cc;
|
|
sc->sc_rx_ready = 1;
|
|
/*
|
|
* See if we are in danger of overflowing a buffer. If
|
|
* so, use hardware flow control to ease the pressure.
|
|
*/
|
|
if (sc->sc_rx_blocked == 0 &&
|
|
cc < sc->sc_r_hiwat) {
|
|
sc->sc_rx_blocked = 1;
|
|
com_hwiflow(sc, 1);
|
|
}
|
|
/*
|
|
* If we're out of space, throw away any further input.
|
|
*/
|
|
if (!cc) {
|
|
while (ISSET(lsr, LSR_RCV_MASK)) {
|
|
bus_space_read_1(iot, ioh, com_data);
|
|
lsr = bus_space_read_1(iot, ioh,
|
|
com_lsr);
|
|
}
|
|
}
|
|
} else {
|
|
if ((iir & IIR_IMASK) == IIR_RXRDY) {
|
|
bus_space_write_1(iot, ioh, com_ier, 0);
|
|
delay(10);
|
|
bus_space_write_1(iot, ioh, com_ier,sc->sc_ier);
|
|
iir = IIR_NOPEND;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
msr = bus_space_read_1(iot, ioh, com_msr);
|
|
delta = msr ^ sc->sc_msr;
|
|
sc->sc_msr = msr;
|
|
if (ISSET(delta, sc->sc_msr_mask)) {
|
|
sc->sc_msr_delta |= delta;
|
|
|
|
/*
|
|
* Stop output immediately if we lose the output
|
|
* flow control signal or carrier detect.
|
|
*/
|
|
if (ISSET(~msr, sc->sc_msr_mask)) {
|
|
sc->sc_tbc = 0;
|
|
sc->sc_heldtbc = 0;
|
|
#ifdef COM_DEBUG
|
|
comstatus(sc, "comintr ");
|
|
#endif
|
|
}
|
|
|
|
sc->sc_st_check = 1;
|
|
}
|
|
} while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND));
|
|
|
|
/*
|
|
* Done handling any receive interrupts. See if data can be
|
|
* transmitted as well. Schedule tx done event if no data left
|
|
* and tty was marked busy.
|
|
*/
|
|
if (ISSET(lsr, LSR_TXRDY)) {
|
|
/*
|
|
* If we've delayed a parameter change, do it now, and restart
|
|
* output.
|
|
*/
|
|
if (sc->sc_heldchange) {
|
|
com_loadchannelregs(sc);
|
|
sc->sc_heldchange = 0;
|
|
sc->sc_tbc = sc->sc_heldtbc;
|
|
sc->sc_heldtbc = 0;
|
|
}
|
|
/* Output the next chunk of the contiguous buffer, if any. */
|
|
if (sc->sc_tbc > 0) {
|
|
int n;
|
|
|
|
n = sc->sc_fifolen;
|
|
if (n > sc->sc_tbc)
|
|
n = sc->sc_tbc;
|
|
bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n);
|
|
sc->sc_tbc -= n;
|
|
sc->sc_tba += n;
|
|
} else if (sc->sc_tx_busy) {
|
|
sc->sc_tx_busy = 0;
|
|
sc->sc_tx_done = 1;
|
|
}
|
|
}
|
|
|
|
/* Wake up the poller. */
|
|
#ifdef __GENERIC_SOFT_INTERRUPTS
|
|
softintr_schedule(sc->sc_si);
|
|
#else
|
|
#ifndef alpha
|
|
setsoftserial();
|
|
#else
|
|
if (!com_softintr_scheduled) {
|
|
com_softintr_scheduled = 1;
|
|
timeout(comsoft, NULL, 1);
|
|
}
|
|
#endif
|
|
#endif
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Following are all routines needed for COM to act as console
|
|
*/
|
|
#include <dev/cons.h>
|
|
|
|
void
|
|
comcnprobe(cp)
|
|
struct consdev *cp;
|
|
{
|
|
/* XXX NEEDS TO BE FIXED XXX */
|
|
bus_space_tag_t iot = 0;
|
|
bus_space_handle_t ioh;
|
|
int found;
|
|
|
|
if (bus_space_map(iot, CONADDR, COM_NPORTS, 0, &ioh)) {
|
|
cp->cn_pri = CN_DEAD;
|
|
return;
|
|
}
|
|
found = comprobe1(iot, ioh, CONADDR);
|
|
bus_space_unmap(iot, ioh, COM_NPORTS);
|
|
if (!found) {
|
|
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;
|
|
{
|
|
|
|
#if 0
|
|
XXX NEEDS TO BE FIXED XXX
|
|
comconstag = ???;
|
|
#endif
|
|
if (bus_space_map(comconstag, CONADDR, COM_NPORTS, 0, &comconsioh))
|
|
panic("comcninit: mapping failed");
|
|
|
|
cominitcons(comconstag, comconsioh, comconsrate);
|
|
comconsaddr = CONADDR;
|
|
}
|
|
|
|
/*
|
|
* Initialize UART to known state.
|
|
*/
|
|
void
|
|
cominit(iot, ioh, rate)
|
|
bus_space_tag_t iot;
|
|
bus_space_handle_t ioh;
|
|
int rate;
|
|
{
|
|
|
|
bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB);
|
|
rate = comspeed(rate);
|
|
bus_space_write_1(iot, ioh, com_dlbl, rate);
|
|
bus_space_write_1(iot, ioh, com_dlbh, rate >> 8);
|
|
bus_space_write_1(iot, ioh, com_lcr, LCR_8BITS);
|
|
bus_space_write_1(iot, ioh, com_mcr, 0);
|
|
bus_space_write_1(iot, ioh, com_fifo,
|
|
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
|
|
bus_space_write_1(iot, ioh, com_ier, 0);
|
|
}
|
|
|
|
/*
|
|
* Set UART for console use. Do normal init, then enable interrupts.
|
|
*/
|
|
void
|
|
cominitcons(iot, ioh, rate)
|
|
bus_space_tag_t iot;
|
|
bus_space_handle_t ioh;
|
|
int rate;
|
|
{
|
|
int s = splserial();
|
|
u_char stat;
|
|
|
|
cominit(iot, ioh, rate);
|
|
bus_space_write_1(iot, ioh, com_ier, IER_ERXRDY | IER_ETXRDY);
|
|
bus_space_write_1(iot, ioh, com_mcr, MCR_DTR | MCR_RTS);
|
|
DELAY(100);
|
|
stat = bus_space_read_1(iot, ioh, com_iir);
|
|
splx(s);
|
|
}
|
|
|
|
int
|
|
comcngetc(dev)
|
|
dev_t dev;
|
|
{
|
|
int s = splserial();
|
|
bus_space_tag_t iot = comconstag;
|
|
bus_space_handle_t ioh = comconsioh;
|
|
u_char stat, c;
|
|
|
|
while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY))
|
|
;
|
|
c = bus_space_read_1(iot, ioh, com_data);
|
|
stat = bus_space_read_1(iot, ioh, com_iir);
|
|
splx(s);
|
|
return (c);
|
|
}
|
|
|
|
/*
|
|
* Console kernel output character routine.
|
|
*/
|
|
void
|
|
comcnputc(dev, c)
|
|
dev_t dev;
|
|
int c;
|
|
{
|
|
int s = splserial();
|
|
bus_space_tag_t iot = comconstag;
|
|
bus_space_handle_t ioh = comconsioh;
|
|
u_char stat;
|
|
register int timo;
|
|
|
|
/* wait for any pending transmission to finish */
|
|
timo = 50000;
|
|
while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo)
|
|
;
|
|
bus_space_write_1(iot, ioh, com_data, c);
|
|
/* wait for this transmission to complete */
|
|
timo = 1500000;
|
|
while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo)
|
|
;
|
|
/* clear any interrupts generated by this transmission */
|
|
stat = bus_space_read_1(iot, ioh, com_iir);
|
|
splx(s);
|
|
}
|
|
|
|
void
|
|
comcnpollc(dev, on)
|
|
dev_t dev;
|
|
int on;
|
|
{
|
|
|
|
}
|