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attimer.c revision 1.9 
      1 /*	$NetBSD: attimer.c,v 1.9 2008/06/12 22:30:30 cegger 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  *
     16  *  THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  *  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  *  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  *  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  *  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  *  POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 /*
     30  * AT Timer
     31  *
     32  * This code only allows control over the pitch of the speaker (pcppi(4)).
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __KERNEL_RCSID(0, "$NetBSD: attimer.c,v 1.9 2008/06/12 22:30:30 cegger Exp $");
     37 
     38 #include <sys/param.h>
     39 #include <sys/systm.h>
     40 #include <sys/kernel.h>
     41 #include <sys/device.h>
     42 
     43 #include <sys/bus.h>
     44 
     45 #include <dev/isa/isareg.h>
     46 
     47 #include <dev/ic/attimervar.h>
     48 #include <dev/ic/i8253reg.h>
     49 
     50 extern struct cfdriver attimer_cd;
     51 
     52 void
     53 attimer_attach(struct attimer_softc *sc)
     54 {
     55 	sc->sc_flags |= ATT_CONFIGURED;
     56 
     57 	if (!pmf_device_register(sc->sc_dev, NULL, NULL))
     58 		aprint_error_dev(sc->sc_dev, "couldn't establish power handler\n");
     59 }
     60 
     61 int
     62 attimer_detach(device_t self, int flags)
     63 {
     64 	struct attimer_softc *sc = device_private(self);
     65 
     66 	pmf_device_deregister(self);
     67 	sc->sc_flags &= ~ATT_CONFIGURED;
     68 	bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_size);
     69 	return 0;
     70 }
     71 
     72 /*
     73  * This is slightly artificial.  While the code looks fine, I can't help
     74  * but pray I'll get the attimer object associated to the pcppi object
     75  * that calls the routine.
     76  *
     77  * There's not much at risk here, as there's about no chance to have a
     78  * computer with more than one pcppi/attimer accessible.
     79  */
     80 
     81 device_t
     82 attimer_attach_speaker(void)
     83 {
     84 	int i;
     85 	struct attimer_softc *sc;
     86 
     87 	for (i = 0; i < attimer_cd.cd_ndevs; i++) {
     88 		sc = device_lookup_private(&attimer_cd, i);
     89 		if (sc == NULL)
     90 			continue;
     91 		if ((sc->sc_flags & ATT_CONFIGURED) &&
     92 		    !(sc->sc_flags & ATT_ATTACHED)) {
     93 			sc->sc_flags |= ATT_ATTACHED;
     94 			return sc->sc_dev;
     95 		}
     96 	}
     97 	return NULL;
     98 }
     99 
    100 void
    101 attimer_set_pitch(device_t dev, int pitch)
    102 {
    103 	struct attimer_softc *sc = device_private(dev);
    104 	int s;
    105 
    106 	s = splhigh();
    107 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
    108 	    TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE);
    109 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
    110 	    TIMER_DIV(pitch) % 256);
    111 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
    112 	    TIMER_DIV(pitch) / 256);
    113 	splx(s);
    114 }
    115