pswitch.c revision 110441 
1/*
2 * Copyright (C) 2002 Benno Rice.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: head/sys/powerpc/powermac/pswitch.c 110441 2003-02-06 11:07:39Z benno $
26 */
27
28#include "opt_ddb.h"
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/malloc.h>
34#include <sys/bus.h>
35#include <machine/bus.h>
36#include <sys/rman.h>
37
38#include <machine/resource.h>
39
40#include <dev/ofw/openfirm.h>
41
42#include <powerpc/powermac/maciovar.h>
43
44struct pswitch_softc {
45	int	sc_irqrid;
46	struct	resource *sc_irq;
47	void	*sc_ih;
48};
49
50static int	pswitch_probe(device_t);
51static int	pswitch_attach(device_t);
52
53static void	pswitch_intr(void *);
54
55static device_method_t pswitch_methods[] = {
56	/* Device interface */
57	DEVMETHOD(device_probe,		pswitch_probe),
58	DEVMETHOD(device_attach,	pswitch_attach),
59
60	{ 0, 0 }
61};
62
63static driver_t pswitch_driver = {
64	"pswitch",
65	pswitch_methods,
66	sizeof(struct pswitch_softc)
67};
68
69static devclass_t pswitch_devclass;
70
71DRIVER_MODULE(pswitch, macio, pswitch_driver, pswitch_devclass, 0, 0);
72
73static int
74pswitch_probe(device_t dev)
75{
76	char	*type = macio_get_devtype(dev);
77
78	if (strcmp(type, "gpio") != 0)
79		return (ENXIO);
80
81	device_set_desc(dev, "GPIO Programmer's Switch");
82	return (0);
83}
84
85static int
86pswitch_attach(device_t dev)
87{
88	struct		pswitch_softc *sc;
89	phandle_t	node, child;
90	char		type[32];
91	u_int		irq[2];
92
93	sc = device_get_softc(dev);
94	node = macio_get_node(dev);
95
96	for (child = OF_child(node); child != 0; child = OF_peer(child)) {
97		if (OF_getprop(child, "device_type", type, 32) == -1)
98			continue;
99
100		if (strcmp(type, "programmer-switch") == 0)
101			break;
102	}
103
104	if (child == 0) {
105		device_printf(dev, "could not find correct node\n");
106		return (ENXIO);
107	}
108
109	if (OF_getprop(child, "interrupts", irq, sizeof(irq)) == -1) {
110		device_printf(dev, "could not get interrupt\n");
111		return (ENXIO);
112	}
113
114	sc->sc_irqrid = 0;
115	sc->sc_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->sc_irqrid,
116	    irq[0], irq[0], 1, RF_ACTIVE);
117	if (sc->sc_irq == NULL) {
118		device_printf(dev, "could not allocate interrupt\n");
119		return (ENXIO);
120	}
121
122	if (bus_setup_intr(dev, sc->sc_irq, INTR_TYPE_MISC | INTR_FAST,
123	    pswitch_intr, dev, &sc->sc_ih) != 0) {
124		device_printf(dev, "could not setup interrupt\n");
125		bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irqrid,
126		    sc->sc_irq);
127		return (ENXIO);
128	}
129
130	return (0);
131}
132
133static void
134pswitch_intr(void *arg)
135{
136	device_t	dev;
137
138	dev = (device_t)arg;
139
140#ifdef DDB
141	Debugger(device_get_nameunit(dev));
142#else
143	device_printf(dev, "close, but no debugger\n");
144#endif
145}
146