FreeBSD/Linux Kernel Cross Reference
sys/dev/qbus/dl.c

     /*      $NetBSD: dl.c,v 1.43 2008/06/11 17:32:30 drochner Exp $ */
     
     /*-
      * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Jason R. Thorpe.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * Copyright (c) 1997  Ben Harris.  All rights reserved.
     * Copyright (c) 1982, 1986, 1990, 1992, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * This code is derived from software contributed to Berkeley by
     * Ralph Campbell and Rick Macklem.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * Copyright (c) 1996  Ken C. Wellsch.  All rights reserved.
     *
     * This code is derived from software contributed to Berkeley by
     * Ralph Campbell and Rick Macklem.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
   /*
    * dl.c -- Device driver for the DL11 and DLV11 serial cards.
    *
    * OS-interface code derived from the dz and dca (hp300) drivers.
    */
   
   #include <sys/cdefs.h>
   __KERNEL_RCSID(0, "$NetBSD: dl.c,v 1.43 2008/06/11 17:32:30 drochner Exp $");
   
   #include <sys/param.h>
   #include <sys/systm.h>
   #include <sys/ioctl.h>
   #include <sys/tty.h>
   #include <sys/proc.h>
   #include <sys/buf.h>
   #include <sys/conf.h>
   #include <sys/file.h>
   #include <sys/uio.h>
   #include <sys/kernel.h>
   #include <sys/syslog.h>
   #include <sys/device.h>
   #include <sys/kauth.h>
   
   #include <sys/bus.h>
   
   #include <dev/qbus/ubavar.h>
   
   #include <dev/qbus/dlreg.h>
   
   #include "ioconf.h"
   
   struct dl_softc {
           struct device   sc_dev;
           struct evcnt    sc_rintrcnt;
           struct evcnt    sc_tintrcnt;
           bus_space_tag_t sc_iot;
           bus_space_handle_t sc_ioh;
           struct tty      *sc_tty;
   };
   
   static  int     dl_match (struct device *, struct cfdata *, void *);
   static  void    dl_attach (struct device *, struct device *, void *);
   static  void    dlrint (void *);
   static  void    dlxint (void *);
   static  void    dlstart (struct tty *);
   static  int     dlparam (struct tty *, struct termios *);
   static  void    dlbrk (struct dl_softc *, int);
   
   CFATTACH_DECL(dl, sizeof(struct dl_softc),
       dl_match, dl_attach, NULL, NULL);
   
   dev_type_open(dlopen);
   dev_type_close(dlclose);
   dev_type_read(dlread);
   dev_type_write(dlwrite);
   dev_type_ioctl(dlioctl);
   dev_type_stop(dlstop);
   dev_type_tty(dltty);
   dev_type_poll(dlpoll);
   
   const struct cdevsw dl_cdevsw = {
           dlopen, dlclose, dlread, dlwrite, dlioctl,
           dlstop, dltty, dlpoll, nommap, ttykqfilter, D_TTY
   };
   
   #define DL_READ_WORD(reg) \
           bus_space_read_2(sc->sc_iot, sc->sc_ioh, reg)
   #define DL_WRITE_WORD(reg, val) \
           bus_space_write_2(sc->sc_iot, sc->sc_ioh, reg, val)
   #define DL_WRITE_BYTE(reg, val) \
           bus_space_write_1(sc->sc_iot, sc->sc_ioh, reg, val)
   
   /* Autoconfig handles: setup the controller to interrupt, */
   /* then complete the housecleaning for full operation */
   
   static int
   dl_match (struct device *parent, struct cfdata *cf, void *aux)
   {
           struct uba_attach_args *ua = aux;
   
   #ifdef DL_DEBUG
           printf("Probing for dl at %lo ... ", (long)ua->ua_iaddr);
   #endif
   
           bus_space_write_2(ua->ua_iot, ua->ua_ioh, DL_UBA_XCSR, DL_XCSR_TXIE);
           if (bus_space_read_2(ua->ua_iot, ua->ua_ioh, DL_UBA_XCSR) !=
               (DL_XCSR_TXIE | DL_XCSR_TX_READY)) {
   #ifdef DL_DEBUG
                   printf("failed (step 1; XCSR = %.4b)\n",
                       bus_space_read_2(ua->ua_iot, ua->ua_ioh, DL_UBA_XCSR),
                       DL_XCSR_BITS);
   #endif
                   return 0;
           }
   
           /*
            * We have to force an interrupt so the uba driver can work
            * out where we are.  Unfortunately, the only way to make a
            * DL11 interrupt is to get it to send or receive a
            * character.  We'll send a NUL and hope it doesn't hurt
            * anything.
            */
   
           bus_space_write_1(ua->ua_iot, ua->ua_ioh, DL_UBA_XBUFL, '\0');
   #if 0 /* This test seems to fail 2/3 of the time :-( */
           if (dladdr->dl_xcsr != (DL_XCSR_TXIE)) {
   #ifdef DL_DEBUG
                   printf("failed (step 2; XCSR = %.4b)\n", dladdr->dl_xcsr,
                       DL_XCSR_BITS);
   #endif
                   return 0;
           }
   #endif
           DELAY(100000); /* delay 1/10 s for character to transmit */
           if (bus_space_read_2(ua->ua_iot, ua->ua_ioh, DL_UBA_XCSR) !=
               (DL_XCSR_TXIE | DL_XCSR_TX_READY)) {
   #ifdef DL_DEBUG
                   printf("failed (step 3; XCSR = %.4b)\n",
                       bus_space_read_2(ua->ua_iot, ua->ua_ioh, DL_UBA_XCSR),
                       DL_XCSR_BITS);
   #endif
                   return 0;
           }
   
   
           /* What else do I need to do? */
   
           return 1;
   
   }
   
   static void
   dl_attach (struct device *parent, struct device *self, void *aux)
   {
           struct dl_softc *sc = device_private(self);
           struct uba_attach_args *ua = aux;
   
           sc->sc_iot = ua->ua_iot;
           sc->sc_ioh = ua->ua_ioh;
   
           /* Tidy up the device */
   
           DL_WRITE_WORD(DL_UBA_RCSR, DL_RCSR_RXIE);
           DL_WRITE_WORD(DL_UBA_XCSR, DL_XCSR_TXIE);
   
           /* Initialize our softc structure. Should be done in open? */
   
           sc->sc_tty = ttymalloc();
           tty_attach(sc->sc_tty);
   
           /* Now register the TX & RX interrupt handlers */
           uba_intr_establish(ua->ua_icookie, ua->ua_cvec,
                   dlxint, sc, &sc->sc_tintrcnt);
           uba_intr_establish(ua->ua_icookie, ua->ua_cvec - 4,
                   dlrint, sc, &sc->sc_rintrcnt);
           evcnt_attach_dynamic(&sc->sc_rintrcnt, EVCNT_TYPE_INTR, ua->ua_evcnt,
                   device_xname(&sc->sc_dev), "rintr");
           evcnt_attach_dynamic(&sc->sc_tintrcnt, EVCNT_TYPE_INTR, ua->ua_evcnt,
                   device_xname(&sc->sc_dev), "tintr");
   
           printf("\n");
   }
   
   /* Receiver Interrupt Handler */
   
   static void
   dlrint(void *arg)
   {
           struct dl_softc *sc = arg;
   
           if (DL_READ_WORD(DL_UBA_RCSR) & DL_RCSR_RX_DONE) {
                   struct tty *tp = sc->sc_tty;
                   unsigned c;
                   int cc;
   
                   c = DL_READ_WORD(DL_UBA_RBUF);
                   cc = c & 0xFF;
   
                   if (!(tp->t_state & TS_ISOPEN)) {
                           cv_broadcast(&tp->t_rawcv);
                           return;
                   }
   
                   if (c & DL_RBUF_OVERRUN_ERR) {
                           /*
                            * XXX: This should really be logged somwhere
                            * else where we can afford the time.
                            */
                           log(LOG_WARNING, "%s: rx overrun\n",
                               device_xname(&sc->sc_dev));
                   }
                   if (c & DL_RBUF_FRAMING_ERR)
                           cc |= TTY_FE;
                   if (c & DL_RBUF_PARITY_ERR)
                           cc |= TTY_PE;
   
                   (*tp->t_linesw->l_rint)(cc, tp);
   #if defined(DIAGNOSTIC)
           } else {
                   log(LOG_WARNING, "%s: stray rx interrupt\n",
                       device_xname(&sc->sc_dev));
   #endif
           }
   }
   
   /* Transmitter Interrupt Handler */
   
   static void
   dlxint(void *arg)
   {
           struct dl_softc *sc = arg;
           struct tty *tp = sc->sc_tty;
   
           tp->t_state &= ~(TS_BUSY | TS_FLUSH);
           (*tp->t_linesw->l_start)(tp);
   
           return;
   }
   
   int
   dlopen(dev_t dev, int flag, int mode, struct lwp *l)
   {
           struct tty *tp;
           struct dl_softc *sc;
           int unit;
   
           unit = minor(dev);
   
           sc = device_lookup_private(&dl_cd, unit);
           if (!sc)
                   return ENXIO;
   
           tp = sc->sc_tty;
           if (tp == NULL)
                   return ENODEV;
           tp->t_oproc = dlstart;
           tp->t_param = dlparam;
           tp->t_dev = dev;
   
           if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
                   return (EBUSY);
   
           if (!(tp->t_state & TS_ISOPEN)) {
                   ttychars(tp);
                   tp->t_iflag = TTYDEF_IFLAG;
                   tp->t_oflag = TTYDEF_OFLAG;
                   /* No modem control, so set CLOCAL. */
                   tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
                   tp->t_lflag = TTYDEF_LFLAG;
                   tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
   
                   dlparam(tp, &tp->t_termios);
                   ttsetwater(tp);
   
           }
   
           return ((*tp->t_linesw->l_open)(dev, tp));
   }
   
   /*ARGSUSED*/
   int
   dlclose(dev_t dev, int flag, int mode, struct lwp *l)
   {
           struct dl_softc *sc = device_lookup_private(&dl_cd, minor(dev));
           struct tty *tp = sc->sc_tty;
   
           (*tp->t_linesw->l_close)(tp, flag);
   
           /* Make sure a BREAK state is not left enabled. */
           dlbrk(sc, 0);
   
           return (ttyclose(tp));
   }
   
   int
   dlread(dev_t dev, struct uio *uio, int flag)
   {
           struct dl_softc *sc = device_lookup_private(&dl_cd, minor(dev));
           struct tty *tp = sc->sc_tty;
   
           return ((*tp->t_linesw->l_read)(tp, uio, flag));
   }
   
   int
   dlwrite(dev_t dev, struct uio *uio, int flag)
   {
           struct dl_softc *sc = device_lookup_private(&dl_cd, minor(dev));
           struct tty *tp = sc->sc_tty;
   
           return ((*tp->t_linesw->l_write)(tp, uio, flag));
   }
   
   int
   dlpoll(dev_t dev, int events, struct lwp *l)
   {
           struct dl_softc *sc = device_lookup_private(&dl_cd, minor(dev));
           struct tty *tp = sc->sc_tty;
   
           return ((*tp->t_linesw->l_poll)(tp, events, l));
   }
   
   int
   dlioctl(dev_t dev, unsigned long cmd, void *data, int flag, struct lwp *l)
   {
           struct dl_softc *sc = device_lookup_private(&dl_cd, minor(dev));
           struct tty *tp = sc->sc_tty;
           int error;
   
   
           error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
           if (error != EPASSTHROUGH)
                   return (error);
   
           error = ttioctl(tp, cmd, data, flag, l);
           if (error != EPASSTHROUGH)
                   return (error);
   
           switch (cmd) {
   
           case TIOCSBRK:
                   dlbrk(sc, 1);
                   break;
   
           case TIOCCBRK:
                   dlbrk(sc, 0);
                   break;
   
           case TIOCMGET:
                   /* No modem control, assume they're all low. */
                   *(int *)data = 0;
                   break;
   
           default:
                   return (EPASSTHROUGH);
           }
           return (0);
   }
   
   struct tty *
   dltty(dev_t dev)
   {
           struct dl_softc *sc = device_lookup_private(&dl_cd, minor(dev));
   
           return sc->sc_tty;
   }
   
   void
   dlstop(struct tty *tp, int flag)
   {
           int s = spltty();
   
           if ((tp->t_state & (TS_BUSY|TS_TTSTOP)) == TS_BUSY)
                   tp->t_state |= TS_FLUSH;
           splx(s);
   }
   
   static void
   dlstart(struct tty *tp)
   {
           struct dl_softc *sc = device_lookup_private(&dl_cd, minor(tp->t_dev));
           int s = spltty();
   
           if (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP))
                   goto out;
           if (!ttypull(tp))
                   goto out;
           if (DL_READ_WORD(DL_UBA_XCSR) & DL_XCSR_TX_READY) {
                   tp->t_state |= TS_BUSY;
                   DL_WRITE_BYTE(DL_UBA_XBUFL, getc(&tp->t_outq));
           }
   out:
           splx(s);
           return;
   }
   
   /*ARGSUSED*/
   static int
   dlparam(struct tty *tp, struct termios *t)
   {
           /*
            * All this kind of stuff (speed, character format, whatever)
            * is set by jumpers on the card.  Changing it is thus rather
            * tricky for a mere device driver.
            */
           return 0;
   }
   
   static void
   dlbrk(struct dl_softc *sc, int state)
   {
           int s = spltty();
   
           if (state) {
                   DL_WRITE_WORD(DL_UBA_XCSR, DL_READ_WORD(DL_UBA_XCSR) |
                       DL_XCSR_TX_BREAK);
           } else {
                   DL_WRITE_WORD(DL_UBA_XCSR, DL_READ_WORD(DL_UBA_XCSR) &
                       ~DL_XCSR_TX_BREAK);
           }
           splx(s);
   }

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