8a962f23f2
the original ad-audiomp branch notes: Add MP locking to the audio drivers. Making the audio drivers MP safe is necessary before efforts can be made to make the VM system MP safe. The are two locks per device instance, an ISR lock and a character device lock. The ISR lock replaces calls to splaudio()/splx(), and will be held across calls to device methods which were called at splaudio() before (e.g. trigger_output). The character device lock is held across calls to nearly all of the methods, excluding some only used for initialization, e.g. get_locks. Welcome to 5.99.57.
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/* $NetBSD: attimer.c,v 1.11 2011/11/23 23:07:32 jmcneill Exp $ */
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/*
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* Copyright (c) 2005 The NetBSD Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* AT Timer
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*
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* This code only allows control over the pitch of the speaker (pcppi(4)).
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: attimer.c,v 1.11 2011/11/23 23:07:32 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/bus.h>
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#include <dev/isa/isareg.h>
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#include <dev/ic/attimervar.h>
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#include <dev/ic/i8253reg.h>
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extern struct cfdriver attimer_cd;
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void
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attimer_attach(struct attimer_softc *sc)
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{
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sc->sc_flags |= ATT_CONFIGURED;
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if (!pmf_device_register(sc->sc_dev, NULL, NULL))
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aprint_error_dev(sc->sc_dev, "couldn't establish power handler\n");
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}
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int
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attimer_detach(device_t self, int flags)
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{
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struct attimer_softc *sc = device_private(self);
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if ((sc->sc_flags & ATT_ATTACHED) != 0)
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return EBUSY;
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pmf_device_deregister(self);
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sc->sc_flags &= ~ATT_CONFIGURED;
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bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_size);
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return 0;
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}
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/*
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* This is slightly artificial. While the code looks fine, I can't help
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* but pray I'll get the attimer object associated to the pcppi object
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* that calls the routine.
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*
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* There's not much at risk here, as there's about no chance to have a
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* computer with more than one pcppi/attimer accessible.
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*
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* Caller provides locking for this routine.
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*/
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device_t
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attimer_attach_speaker(void)
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{
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int i;
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struct attimer_softc *sc;
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for (i = 0; i < attimer_cd.cd_ndevs; i++) {
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sc = device_lookup_private(&attimer_cd, i);
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if (sc == NULL)
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continue;
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if ((sc->sc_flags & ATT_CONFIGURED) &&
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!(sc->sc_flags & ATT_ATTACHED)) {
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sc->sc_flags |= ATT_ATTACHED;
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return sc->sc_dev;
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}
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}
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return NULL;
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}
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void
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attimer_detach_speaker(device_t dev)
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{
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struct attimer_softc *sc = device_private(dev);
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sc->sc_flags &= ~ATT_ATTACHED;
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}
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/*
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* Caller provides locking for this routine.
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*/
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void
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attimer_set_pitch(device_t dev, int pitch)
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{
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struct attimer_softc *sc = device_private(dev);
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
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TIMER_SEL2 | TIMER_16BIT | TIMER_SQWAVE);
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
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TIMER_DIV(pitch) % 256);
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bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR2,
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TIMER_DIV(pitch) / 256);
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}
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