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attimer.c revision 1.3 
      1  1.3  cube /*	$NetBSD: attimer.c,v 1.3 2007/09/10 10:35:53 cube Exp $	*/
      2  1.1  cube 
      3  1.1  cube /*
      4  1.1  cube  *  Copyright (c) 2005 The NetBSD Foundation.
      5  1.1  cube  *  All rights reserved.
      6  1.1  cube  *
      7  1.1  cube  *  Redistribution and use in source and binary forms, with or without
      8  1.1  cube  *  modification, are permitted provided that the following conditions
      9  1.1  cube  *  are met:
     10  1.1  cube  *  1. Redistributions of source code must retain the above copyright
     11  1.1  cube  *     notice, this list of conditions and the following disclaimer.
     12  1.1  cube  *  2. Redistributions in binary form must reproduce the above copyright
     13  1.1  cube  *     notice, this list of conditions and the following disclaimer in the
     14  1.1  cube  *     documentation and/or other materials provided with the distribution.
     15  1.3  cube  *  3. Neither the name of The NetBSD Foundation nor the names of its
     16  1.1  cube  *     contributors may be used to endorse or promote products derived
     17  1.1  cube  *     from this software without specific prior written permission.
     18  1.1  cube  *
     19  1.1  cube  *  THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1  cube  *  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1  cube  *  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1  cube  *  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1  cube  *  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1  cube  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1  cube  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1  cube  *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1  cube  *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1  cube  *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1  cube  *  POSSIBILITY OF SUCH DAMAGE.
     30  1.1  cube  */
     31  1.1  cube 
     32  1.1  cube /*
     33  1.1  cube  * AT Timer
     34  1.1  cube  *
     35  1.1  cube  * This code only allows control over the pitch of the speaker (pcppi(4)).
     36  1.1  cube  */
     37  1.1  cube 
     38  1.1  cube #include <sys/cdefs.h>
     39  1.3  cube __KERNEL_RCSID(0, "$NetBSD: attimer.c,v 1.3 2007/09/10 10:35:53 cube Exp $");
     40  1.1  cube 
     41  1.1  cube #include <sys/param.h>
     42  1.1  cube #include <sys/systm.h>
     43  1.1  cube #include <sys/kernel.h>
     44  1.1  cube #include <sys/device.h>
     45  1.1  cube 
     46  1.1  cube #include <machine/bus.h>
     47  1.1  cube 
     48  1.1  cube #include <dev/isa/isareg.h>
     49  1.1  cube 
     50  1.1  cube #include <dev/ic/attimervar.h>
     51  1.1  cube #include <dev/ic/i8253reg.h>
     52  1.1  cube 
     53  1.1  cube extern struct cfdriver attimer_cd;
     54  1.1  cube 
     55  1.1  cube void
     56  1.1  cube attimer_attach(struct attimer_softc *sc)
     57  1.1  cube {
     58  1.1  cube 	sc->sc_flags |= ATT_CONFIGURED;
     59  1.1  cube }
     60  1.1  cube 
     61  1.1  cube /*
     62  1.1  cube  * This is slightly artificial.  While the code looks fine, I can't help
     63  1.1  cube  * but pray I'll get the attimer object associated to the pcppi object
     64  1.1  cube  * that calls the routine.
     65  1.1  cube  *
     66  1.1  cube  * There's not much at risk here, as there's about no chance to have a
     67  1.1  cube  * computer with more than one pcppi/attimer accessible.
     68  1.1  cube  */
     69  1.1  cube 
     70  1.1  cube struct attimer_softc *
     71  1.1  cube attimer_attach_speaker()
     72  1.1  cube {
     73  1.1  cube 	int i;
     74  1.1  cube 	struct attimer_softc *sc;
     75  1.1  cube 
     76  1.1  cube 	for (i = 0; i < attimer_cd.cd_ndevs; i++)
     77  1.1  cube 		if (attimer_cd.cd_devs[i] != NULL) {
     78  1.1  cube 			sc = (struct attimer_softc *)attimer_cd.cd_devs[i];
     79  1.1  cube 			if ((sc->sc_flags & ATT_CONFIGURED) &&
     80  1.1  cube 			    !(sc->sc_flags & ATT_ATTACHED)) {
     81  1.1  cube 				sc->sc_flags |= ATT_ATTACHED;
     82  1.1  cube 				return sc;
     83  1.1  cube 			}
     84  1.1  cube 		}
     85  1.1  cube 	return NULL;
     86  1.1  cube }
     87  1.1  cube 
     88  1.1  cube void
     89  1.1  cube attimer_set_pitch(struct attimer_softc *sc, int pitch)
     90  1.1  cube {
     91  1.1  cube 	int s;
     92  1.1  cube 	s = splhigh();
     93  1.1  cube 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
     94  1.1  cube 	    TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE);
     95  1.1  cube 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
     96  1.1  cube 	    TIMER_DIV(pitch) % 256);
     97  1.1  cube 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
     98  1.1  cube 	    TIMER_DIV(pitch) / 256);
     99  1.1  cube 	splx(s);
    100  1.1  cube }
    101