101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/* $NetBSD: attimer.c,v 1.4 2007/10/19 11:59:48 ad Exp $ */
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/*
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* Copyright (c) 2005 The NetBSD Foundation.
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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. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* AT Timer
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*
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* This code only allows control over the pitch of the speaker (pcppi(4)).
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: attimer.c,v 1.4 2007/10/19 11:59:48 ad Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/bus.h>
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#include <dev/isa/isareg.h>
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#include <dev/ic/attimervar.h>
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#include <dev/ic/i8253reg.h>
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extern struct cfdriver attimer_cd;
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void
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attimer_attach(struct attimer_softc *sc)
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{
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sc->sc_flags |= ATT_CONFIGURED;
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}
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/*
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* This is slightly artificial. While the code looks fine, I can't help
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* but pray I'll get the attimer object associated to the pcppi object
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* that calls the routine.
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*
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* There's not much at risk here, as there's about no chance to have a
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* computer with more than one pcppi/attimer accessible.
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*/
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struct attimer_softc *
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attimer_attach_speaker()
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{
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int i;
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struct attimer_softc *sc;
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for (i = 0; i < attimer_cd.cd_ndevs; i++)
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if (attimer_cd.cd_devs[i] != NULL) {
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sc = (struct attimer_softc *)attimer_cd.cd_devs[i];
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if ((sc->sc_flags & ATT_CONFIGURED) &&
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!(sc->sc_flags & ATT_ATTACHED)) {
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sc->sc_flags |= ATT_ATTACHED;
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return sc;
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}
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}
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return NULL;
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}
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void
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attimer_set_pitch(struct attimer_softc *sc, int pitch)
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{
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int s;
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s = splhigh();
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
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TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE);
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
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TIMER_DIV(pitch) % 256);
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
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TIMER_DIV(pitch) / 256);
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splx(s);
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}
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