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/* $NetBSD: attimer.c,v 1.12 2017/10/28 04:53:55 riastradh Exp $ */
/*
* Copyright (c) 2005 The NetBSD Foundation.
* All rights reserved.
*
* 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.
*/
/*
* 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 1.12 2017/10/28 04:53:55 riastradh Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/bus.h>
#include <dev/isa/isareg.h>
#include <dev/ic/attimervar.h>
#include <dev/ic/i8253reg.h>
#include "ioconf.h"
void
attimer_attach(struct attimer_softc *sc)
{
sc->sc_flags |= ATT_CONFIGURED;
if (!pmf_device_register(sc->sc_dev, NULL, NULL))
aprint_error_dev(sc->sc_dev, "couldn't establish power handler\n");
}
int
attimer_detach(device_t self, int flags)
{
struct attimer_softc *sc = device_private(self);
if ((sc->sc_flags & ATT_ATTACHED) != 0)
return EBUSY;
pmf_device_deregister(self);
sc->sc_flags &= ~ATT_CONFIGURED;
bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_size);
return 0;
}
/*
* 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.
*
* Caller provides locking for this routine.
*/
device_t
attimer_attach_speaker(void)
{
int i;
struct attimer_softc *sc;
for (i = 0; i < attimer_cd.cd_ndevs; i++) {
sc = device_lookup_private(&attimer_cd, i);
if (sc == NULL)
continue;
if ((sc->sc_flags & ATT_CONFIGURED) &&
!(sc->sc_flags & ATT_ATTACHED)) {
sc->sc_flags |= ATT_ATTACHED;
return sc->sc_dev;
}
}
return NULL;
}
void
attimer_detach_speaker(device_t dev)
{
struct attimer_softc *sc = device_private(dev);
sc->sc_flags &= ~ATT_ATTACHED;
}
/*
* Caller provides locking for this routine.
*/
void
attimer_set_pitch(device_t dev, int pitch)
{
struct attimer_softc *sc = device_private(dev);
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);
}
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