/*      $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);
}