xref: /freebsd/sys/powerpc/powermac/pswitch.c (revision eac7052fdebb90caf2f653e06187bdbca837b9c7)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (C) 2002 Benno Rice.
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 Benno Rice ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  * $FreeBSD$
28  */
29 
30 #include "opt_ddb.h"
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kdb.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/malloc.h>
38 #include <sys/bus.h>
39 #include <machine/bus.h>
40 #include <sys/rman.h>
41 
42 #include <machine/resource.h>
43 
44 #include <dev/ofw/openfirm.h>
45 
46 #include <powerpc/powermac/maciovar.h>
47 
48 struct pswitch_softc {
49 	int	sc_irqrid;
50 	struct	resource *sc_irq;
51 	void	*sc_ih;
52 };
53 
54 static int	pswitch_probe(device_t);
55 static int	pswitch_attach(device_t);
56 
57 static int	pswitch_intr(void *);
58 
59 static device_method_t pswitch_methods[] = {
60 	/* Device interface */
61 	DEVMETHOD(device_probe,		pswitch_probe),
62 	DEVMETHOD(device_attach,	pswitch_attach),
63 	{ 0, 0 }
64 };
65 
66 static driver_t pswitch_driver = {
67 	"pswitch",
68 	pswitch_methods,
69 	sizeof(struct pswitch_softc)
70 };
71 
72 static devclass_t pswitch_devclass;
73 
74 DRIVER_MODULE(pswitch, macio, pswitch_driver, pswitch_devclass, 0, 0);
75 
76 static int
77 pswitch_probe(device_t dev)
78 {
79 	char	*type = macio_get_devtype(dev);
80 
81 	if (strcmp(type, "gpio") != 0)
82 		return (ENXIO);
83 
84 	device_set_desc(dev, "GPIO Programmer's Switch");
85 	return (0);
86 }
87 
88 static int
89 pswitch_attach(device_t dev)
90 {
91 	struct		pswitch_softc *sc;
92 	phandle_t	node, child;
93 	char		type[32];
94 	u_int		irq[2];
95 
96 	sc = device_get_softc(dev);
97 	node = macio_get_node(dev);
98 
99 	for (child = OF_child(node); child != 0; child = OF_peer(child)) {
100 		if (OF_getprop(child, "device_type", type, 32) == -1)
101 			continue;
102 
103 		if (strcmp(type, "programmer-switch") == 0)
104 			break;
105 	}
106 
107 	if (child == 0) {
108 		device_printf(dev, "could not find correct node\n");
109 		return (ENXIO);
110 	}
111 
112 	if (OF_getprop(child, "interrupts", irq, sizeof(irq)) == -1) {
113 		device_printf(dev, "could not get interrupt\n");
114 		return (ENXIO);
115 	}
116 
117 	sc->sc_irqrid = 0;
118 	sc->sc_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->sc_irqrid,
119 	    irq[0], irq[0], 1, RF_ACTIVE);
120 	if (sc->sc_irq == NULL) {
121 		device_printf(dev, "could not allocate interrupt\n");
122 		return (ENXIO);
123 	}
124 
125 	if (bus_setup_intr(dev, sc->sc_irq, INTR_TYPE_MISC,
126 	    pswitch_intr, NULL, dev, &sc->sc_ih) != 0) {
127 		device_printf(dev, "could not setup interrupt\n");
128 		bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irqrid,
129 		    sc->sc_irq);
130 		return (ENXIO);
131 	}
132 
133 	return (0);
134 }
135 
136 static int
137 pswitch_intr(void *arg)
138 {
139 	device_t	dev;
140 
141 	dev = (device_t)arg;
142 
143 	kdb_enter(KDB_WHY_POWERPC, device_get_nameunit(dev));
144 	return (FILTER_HANDLED);
145 }
146