FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/attimer.c

     /*      $NetBSD: attimer.c,v 1.2 2005/12/11 12:21:26 christos Exp $     */
     
     /*
      *  Copyright (c) 2005 The NetBSD Foundation.
      *  All rights reserved.
      *
      *  This code is derived from software contributed to the NetBSD Foundation
      *   by Quentin Garnier.
      *
     *  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 NetBSD
     *         Foundation, Inc. and its contributors.
     *  4. Neither the name of The NetBSD Foundation 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 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.
     */
    
    /*
     * AT Timer
     *
     * This code only allows control over the pitch of the speaker (pcppi(4)).
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: attimer.c,v 1.2 2005/12/11 12:21:26 christos Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/device.h>
    
    #include <machine/bus.h>
    
    #include <dev/isa/isareg.h>
    
    #include <dev/ic/attimervar.h>
    #include <dev/ic/i8253reg.h>
    
    extern struct cfdriver attimer_cd;
    
    void
    attimer_attach(struct attimer_softc *sc)
    {
            sc->sc_flags |= ATT_CONFIGURED;
    }
    
    /*
     * This is slightly artificial.  While the code looks fine, I can't help
     * but pray I'll get the attimer object associated to the pcppi object
     * that calls the routine.
     *
     * There's not much at risk here, as there's about no chance to have a
     * computer with more than one pcppi/attimer accessible.
     */
    
    struct attimer_softc *
    attimer_attach_speaker()
    {
            int i;
            struct attimer_softc *sc;
    
            for (i = 0; i < attimer_cd.cd_ndevs; i++)
                    if (attimer_cd.cd_devs[i] != NULL) {
                            sc = (struct attimer_softc *)attimer_cd.cd_devs[i];
                            if ((sc->sc_flags & ATT_CONFIGURED) &&
                                !(sc->sc_flags & ATT_ATTACHED)) {
                                    sc->sc_flags |= ATT_ATTACHED;
                                    return sc;
                            }
                    }
            return NULL;
    }
    
    void
    attimer_set_pitch(struct attimer_softc *sc, int pitch)
    {
            int s;
            s = splhigh();
           bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
               TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE);
           bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
               TIMER_DIV(pitch) % 256);
           bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
               TIMER_DIV(pitch) / 256);
           splx(s);
   }

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