sys/dev/ic/attimer.c

   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         if ((sc->sc_flags & ATT_ATTACHED) != 0)
  67                 return EBUSY;
  68
  69         pmf_device_deregister(self);
  70         sc->sc_flags &= ~ATT_CONFIGURED;
  71         bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_size);
  72         return 0;
  73 }
  74
  75 /*
  76  * This is slightly artificial.  While the code looks fine, I can't help
  77  * but pray I'll get the attimer object associated to the pcppi object
  78  * that calls the routine.
  79  *
  80  * There's not much at risk here, as there's about no chance to have a
  81  * computer with more than one pcppi/attimer accessible.
  82  */
  83
  84 device_t
  85 attimer_attach_speaker(void)
  86 {
  87         int i;
  88         struct attimer_softc *sc;
  89
  90         for (i = 0; i < attimer_cd.cd_ndevs; i++) {
  91                 sc = device_lookup_private(&attimer_cd, i);
  92                 if (sc == NULL)
  93                         continue;
  94                 if ((sc->sc_flags & ATT_CONFIGURED) &&
  95                     !(sc->sc_flags & ATT_ATTACHED)) {
  96                         sc->sc_flags |= ATT_ATTACHED;
  97                         return sc->sc_dev;
  98                 }
  99         }
 100         return NULL;
 101 }
 102
 103 void
 104 attimer_detach_speaker(device_t dev)
 105 {
 106         struct attimer_softc *sc = device_private(dev);
 107
 108         sc->sc_flags &= ~ATT_ATTACHED;
 109 }
 110
 111 void
 112 attimer_set_pitch(device_t dev, int pitch)
 113 {
 114         struct attimer_softc *sc = device_private(dev);
 115         int s;
 116
 117         s = splhigh();
 118         bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
 119             TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE);
 120         bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
 121             TIMER_DIV(pitch) % 256);
 122         bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
 123             TIMER_DIV(pitch) / 256);
 124         splx(s);
 125 }