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