NetBSD/sys/dev/ic/attimer.c

108 lines
3.5 KiB
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);
}