1 /* $OpenBSD: pgs.c,v 1.6 2022/03/13 12:33:01 mpi Exp $ */
2 /*
3 * Copyright (c) 2010 Jasper Lievisse Adriaanse <jasper@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 /*
19 * This driver allows entering DDB by pushing the "Programmers Switch",
20 * which can be found on many "Old World" and some early "New World" MacPPC.
21 */
22
23 #include <sys/param.h>
24 #include <sys/systm.h>
25 #include <sys/proc.h>
26 #include <sys/device.h>
27
28 #include <ddb/db_var.h>
29 #include <dev/ofw/openfirm.h>
30
31 #include <machine/bus.h>
32 #include <machine/autoconf.h>
33
34 struct pgs_softc {
35 struct device sc_dev;
36 int sc_node;
37 int sc_intr;
38 };
39
40 void pgs_attach(struct device *, struct device *, void *);
41 int pgs_match(struct device *, void *, void *);
42 int pgs_intr(void *);
43
44 const struct cfattach pgs_ca = {
45 sizeof(struct pgs_softc), pgs_match, pgs_attach
46 };
47
48 struct cfdriver pgs_cd = {
49 NULL, "pgs", DV_DULL
50 };
51
52 int
pgs_match(struct device * parent,void * arg,void * aux)53 pgs_match(struct device *parent, void *arg, void *aux)
54 {
55 struct confargs *ca = aux;
56 char type[32];
57
58 if (strcmp(ca->ca_name, "programmer-switch") != 0)
59 return 0;
60
61 OF_getprop(ca->ca_node, "device_type", type, sizeof(type));
62 if (strcmp(type, "programmer-switch") != 0)
63 return 0;
64
65 return 1;
66 }
67
68 void
pgs_attach(struct device * parent,struct device * self,void * aux)69 pgs_attach(struct device *parent, struct device *self, void *aux)
70 {
71 struct pgs_softc *sc = (struct pgs_softc *)self;
72 struct confargs *ca = aux;
73 int intr[2];
74
75 sc->sc_node = ca->ca_node;
76
77 OF_getprop(sc->sc_node, "interrupts", intr, sizeof(intr));
78 sc->sc_intr = intr[0];
79
80 printf(": irq %d\n", sc->sc_intr);
81
82 mac_intr_establish(parent, sc->sc_intr, IST_LEVEL,
83 IPL_HIGH, pgs_intr, sc, sc->sc_dev.dv_xname);
84 }
85
86 int
pgs_intr(void * v)87 pgs_intr(void *v)
88 {
89 #ifdef DDB
90 if (db_console)
91 db_enter();
92 #else
93 printf("programmer-switch pressed, debugger not available.\n");
94 #endif
95
96 return 1;
97 }
98