| 1 | /* $NetBSD: attimer.c,v 1.11 2011/11/23 23:07:32 jmcneill 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 1.11 2011/11/23 23:07:32 jmcneill 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 | * Caller provides locking for this routine. |
| 84 | */ |
| 85 | |
| 86 | device_t |
| 87 | attimer_attach_speaker(void) |
| 88 | { |
| 89 | int i; |
| 90 | struct attimer_softc *sc; |
| 91 | |
| 92 | for (i = 0; i < attimer_cd.cd_ndevs; i++) { |
| 93 | sc = device_lookup_private(&attimer_cd, i); |
| 94 | if (sc == NULL) |
| 95 | continue; |
| 96 | if ((sc->sc_flags & ATT_CONFIGURED) && |
| 97 | !(sc->sc_flags & ATT_ATTACHED)) { |
| 98 | sc->sc_flags |= ATT_ATTACHED; |
| 99 | return sc->sc_dev; |
| 100 | } |
| 101 | } |
| 102 | return NULL; |
| 103 | } |
| 104 | |
| 105 | void |
| 106 | attimer_detach_speaker(device_t dev) |
| 107 | { |
| 108 | struct attimer_softc *sc = device_private(dev); |
| 109 | |
| 110 | sc->sc_flags &= ~ATT_ATTACHED; |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * Caller provides locking for this routine. |
| 115 | */ |
| 116 | |
| 117 | void |
| 118 | attimer_set_pitch(device_t dev, int pitch) |
| 119 | { |
| 120 | struct attimer_softc *sc = device_private(dev); |
| 121 | |
| 122 | bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE, |
| 123 | TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE); |
| 124 | bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2, |
| 125 | TIMER_DIV(pitch) % 256); |
| 126 | bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2, |
| 127 | TIMER_DIV(pitch) / 256); |
| 128 | } |
| 129 | |