1 /* $NetBSD: attimer.c,v 1.12 2017/10/28 04:53:55 riastradh 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 1.12 2017/10/28 04:53:55 riastradh 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 #include "ioconf.h" 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