1 /* $NetBSD: attimer.c,v 1.2 2005/12/11 12:21:26 christos 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 1.2 2005/12/11 12:21:26 christos 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