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attimer.c revision 1.4 
      1 /*	$NetBSD: attimer.c,v 1.4 2007/10/19 11:59:48 ad Exp $	*/
      2 
      3 /*
      4  *  Copyright (c) 2005 The NetBSD Foundation.
      5  *  All rights reserved.
      6  *
      7  *  Redistribution and use in source and binary forms, with or without
      8  *  modification, are permitted provided that the following conditions
      9  *  are met:
     10  *  1. Redistributions of source code must retain the above copyright
     11  *     notice, this list of conditions and the following disclaimer.
     12  *  2. Redistributions in binary form must reproduce the above copyright
     13  *     notice, this list of conditions and the following disclaimer in the
     14  *     documentation and/or other materials provided with the distribution.
     15  *  3. Neither the name of The NetBSD Foundation nor the names of its
     16  *     contributors may be used to endorse or promote products derived
     17  *     from this software without specific prior written permission.
     18  *
     19  *  THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  *  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  *  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  *  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  *  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  *  POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * AT Timer
     34  *
     35  * This code only allows control over the pitch of the speaker (pcppi(4)).
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: attimer.c,v 1.4 2007/10/19 11:59:48 ad Exp $");
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/kernel.h>
     44 #include <sys/device.h>
     45 
     46 #include <sys/bus.h>
     47 
     48 #include <dev/isa/isareg.h>
     49 
     50 #include <dev/ic/attimervar.h>
     51 #include <dev/ic/i8253reg.h>
     52 
     53 extern struct cfdriver attimer_cd;
     54 
     55 void
     56 attimer_attach(struct attimer_softc *sc)
     57 {
     58 	sc->sc_flags |= ATT_CONFIGURED;
     59 }
     60 
     61 /*
     62  * This is slightly artificial.  While the code looks fine, I can't help
     63  * but pray I'll get the attimer object associated to the pcppi object
     64  * that calls the routine.
     65  *
     66  * There's not much at risk here, as there's about no chance to have a
     67  * computer with more than one pcppi/attimer accessible.
     68  */
     69 
     70 struct attimer_softc *
     71 attimer_attach_speaker()
     72 {
     73 	int i;
     74 	struct attimer_softc *sc;
     75 
     76 	for (i = 0; i < attimer_cd.cd_ndevs; i++)
     77 		if (attimer_cd.cd_devs[i] != NULL) {
     78 			sc = (struct attimer_softc *)attimer_cd.cd_devs[i];
     79 			if ((sc->sc_flags & ATT_CONFIGURED) &&
     80 			    !(sc->sc_flags & ATT_ATTACHED)) {
     81 				sc->sc_flags |= ATT_ATTACHED;
     82 				return sc;
     83 			}
     84 		}
     85 	return NULL;
     86 }
     87 
     88 void
     89 attimer_set_pitch(struct attimer_softc *sc, int pitch)
     90 {
     91 	int s;
     92 	s = splhigh();
     93 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
     94 	    TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE);
     95 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
     96 	    TIMER_DIV(pitch) % 256);
     97 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
     98 	    TIMER_DIV(pitch) / 256);
     99 	splx(s);
    100 }
    101