d674899b66
DDB when the interrupt button (aka the "programmer's switch") is pressed. This isn't unfortunately an NMI, but it's a handy way to get into DDB quickly if needed.
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
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* Copyright (C) 2002 Benno Rice.
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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 Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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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/malloc.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <dev/ofw/openfirm.h>
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#include <powerpc/powermac/maciovar.h>
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struct pswitch_softc {
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int sc_irqrid;
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struct resource *sc_irq;
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void *sc_ih;
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};
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static int pswitch_probe(device_t);
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static int pswitch_attach(device_t);
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static void pswitch_intr(void *);
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static device_method_t pswitch_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, pswitch_probe),
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DEVMETHOD(device_attach, pswitch_attach),
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{ 0, 0 }
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};
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static driver_t pswitch_driver = {
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"pswitch",
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pswitch_methods,
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sizeof(struct pswitch_softc)
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};
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static devclass_t pswitch_devclass;
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DRIVER_MODULE(pswitch, macio, pswitch_driver, pswitch_devclass, 0, 0);
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static int
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pswitch_probe(device_t dev)
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{
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char *type = macio_get_devtype(dev);
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if (strcmp(type, "gpio") != 0)
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return (ENXIO);
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device_set_desc(dev, "GPIO Programmer's Switch");
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return (0);
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}
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static int
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pswitch_attach(device_t dev)
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{
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struct pswitch_softc *sc;
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phandle_t node, child;
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char type[32];
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u_int irq[2];
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sc = device_get_softc(dev);
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node = macio_get_node(dev);
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for (child = OF_child(node); child != 0; child = OF_peer(child)) {
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if (OF_getprop(child, "device_type", type, 32) == -1)
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continue;
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if (strcmp(type, "programmer-switch") == 0)
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break;
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}
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if (child == 0) {
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device_printf(dev, "could not find correct node\n");
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return (ENXIO);
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}
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if (OF_getprop(child, "interrupts", irq, sizeof(irq)) == -1) {
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device_printf(dev, "could not get interrupt\n");
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return (ENXIO);
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}
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sc->sc_irqrid = 0;
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sc->sc_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->sc_irqrid,
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irq[0], irq[0], 1, RF_ACTIVE);
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if (sc->sc_irq == NULL) {
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device_printf(dev, "could not allocate interrupt\n");
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return (ENXIO);
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}
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if (bus_setup_intr(dev, sc->sc_irq, INTR_TYPE_MISC | INTR_FAST,
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pswitch_intr, dev, &sc->sc_ih) != 0) {
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device_printf(dev, "could not setup interrupt\n");
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bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irqrid,
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sc->sc_irq);
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return (ENXIO);
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}
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return (0);
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}
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static void
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pswitch_intr(void *arg)
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{
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device_t dev;
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dev = (device_t)arg;
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#ifdef DDB
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Debugger(device_get_nameunit(dev));
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#else
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device_printf(dev, "close, but no debugger\n");
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#endif
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}
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