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attimer.c revision 1.1 
      1 /*	$NetBSD: attimer.c,v 1.1 2005/03/25 23:06:19 cube Exp $	*/
      2 
      3 /*
      4  *  Copyright (c) 2005 The NetBSD Foundation.
      5  *  All rights reserved.
      6  *
      7  *  This code is derived from software contributed to the NetBSD Foundation
      8  *   by Quentin Garnier.
      9  *
     10  *  Redistribution and use in source and binary forms, with or without
     11  *  modification, are permitted provided that the following conditions
     12  *  are met:
     13  *  1. Redistributions of source code must retain the above copyright
     14  *     notice, this list of conditions and the following disclaimer.
     15  *  2. Redistributions in binary form must reproduce the above copyright
     16  *     notice, this list of conditions and the following disclaimer in the
     17  *     documentation and/or other materials provided with the distribution.
     18  *  3. All advertising materials mentioning features or use of this software
     19  *     must display the following acknowledgement:
     20  *         This product includes software developed by the NetBSD
     21  *         Foundation, Inc. and its contributors.
     22  *  4. Neither the name of The NetBSD Foundation nor the names of its
     23  *     contributors may be used to endorse or promote products derived
     24  *     from this software without specific prior written permission.
     25  *
     26  *  THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  *  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  *  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  *  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  *  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  *  POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * AT Timer
     41  *
     42  * This code only allows control over the pitch of the speaker (pcppi(4)).
     43  */
     44 
     45 #include <sys/cdefs.h>
     46 __KERNEL_RCSID(0, "$NetBSD: attimer.c,v 1.1 2005/03/25 23:06:19 cube Exp $");
     47 
     48 #include <sys/param.h>
     49 #include <sys/systm.h>
     50 #include <sys/kernel.h>
     51 #include <sys/device.h>
     52 
     53 #include <machine/bus.h>
     54 
     55 #include <dev/isa/isareg.h>
     56 
     57 #include <dev/ic/attimervar.h>
     58 #include <dev/ic/i8253reg.h>
     59 
     60 extern struct cfdriver attimer_cd;
     61 
     62 void
     63 attimer_attach(struct attimer_softc *sc)
     64 {
     65 	sc->sc_flags |= ATT_CONFIGURED;
     66 }
     67 
     68 /*
     69  * This is slightly artificial.  While the code looks fine, I can't help
     70  * but pray I'll get the attimer object associated to the pcppi object
     71  * that calls the routine.
     72  *
     73  * There's not much at risk here, as there's about no chance to have a
     74  * computer with more than one pcppi/attimer accessible.
     75  */
     76 
     77 struct attimer_softc *
     78 attimer_attach_speaker()
     79 {
     80 	int i;
     81 	struct attimer_softc *sc;
     82 
     83 	for (i = 0; i < attimer_cd.cd_ndevs; i++)
     84 		if (attimer_cd.cd_devs[i] != NULL) {
     85 			sc = (struct attimer_softc *)attimer_cd.cd_devs[i];
     86 			if ((sc->sc_flags & ATT_CONFIGURED) &&
     87 			    !(sc->sc_flags & ATT_ATTACHED)) {
     88 				sc->sc_flags |= ATT_ATTACHED;
     89 				return sc;
     90 			}
     91 		}
     92 	return NULL;
     93 }
     94 
     95 void
     96 attimer_set_pitch(struct attimer_softc *sc, int pitch)
     97 {
     98 	int s;
     99 	s = splhigh();
    100 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
    101 	    TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE);
    102 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
    103 	    TIMER_DIV(pitch) % 256);
    104 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
    105 	    TIMER_DIV(pitch) / 256);
    106 	splx(s);
    107 }
    108