epwdog.c revision 1.6 1 1.6 skrll /* $NetBSD: epwdog.c,v 1.6 2021/11/21 08:25:26 skrll Exp $ */
2 1.1 hamajima
3 1.1 hamajima /*
4 1.1 hamajima * Copyright (c) 2005 HAMAJIMA Katsuomi. All rights reserved.
5 1.1 hamajima *
6 1.1 hamajima * Redistribution and use in source and binary forms, with or without
7 1.1 hamajima * modification, are permitted provided that the following conditions
8 1.1 hamajima * are met:
9 1.1 hamajima * 1. Redistributions of source code must retain the above copyright
10 1.1 hamajima * notice, this list of conditions and the following disclaimer.
11 1.1 hamajima * 2. Redistributions in binary form must reproduce the above copyright
12 1.1 hamajima * notice, this list of conditions and the following disclaimer in the
13 1.1 hamajima * documentation and/or other materials provided with the distribution.
14 1.1 hamajima *
15 1.1 hamajima * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 1.1 hamajima * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 1.1 hamajima * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 1.1 hamajima * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 1.1 hamajima * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 1.1 hamajima * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 1.1 hamajima * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 1.1 hamajima * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 1.1 hamajima * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 1.1 hamajima * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 1.1 hamajima * SUCH DAMAGE.
26 1.1 hamajima */
27 1.1 hamajima
28 1.1 hamajima #include <sys/cdefs.h>
29 1.6 skrll __KERNEL_RCSID(0, "$NetBSD: epwdog.c,v 1.6 2021/11/21 08:25:26 skrll Exp $");
30 1.1 hamajima
31 1.1 hamajima #include <sys/param.h>
32 1.1 hamajima #include <sys/systm.h>
33 1.1 hamajima #include <sys/kernel.h>
34 1.1 hamajima #include <sys/device.h>
35 1.4 dyoung #include <sys/bus.h>
36 1.6 skrll #include <arm/ep93xx/ep93xxvar.h>
37 1.6 skrll #include <arm/ep93xx/epsocvar.h>
38 1.1 hamajima #include <arm/ep93xx/epwdogreg.h>
39 1.1 hamajima #include <arm/ep93xx/epwdogvar.h>
40 1.1 hamajima
41 1.1 hamajima struct epwdog_softc {
42 1.1 hamajima bus_space_tag_t sc_iot;
43 1.1 hamajima bus_space_handle_t sc_ioh;
44 1.1 hamajima };
45 1.1 hamajima
46 1.5 chs static int epwdog_match(device_t, cfdata_t, void *);
47 1.5 chs static void epwdog_attach(device_t, device_t, void *);
48 1.1 hamajima
49 1.5 chs CFATTACH_DECL_NEW(epwdog, sizeof(struct epwdog_softc),
50 1.1 hamajima epwdog_match, epwdog_attach, NULL, NULL);
51 1.1 hamajima
52 1.1 hamajima static struct epwdog_softc *the_epwdog_sc = 0;
53 1.1 hamajima
54 1.1 hamajima static int
55 1.5 chs epwdog_match(device_t parent, cfdata_t match, void *aux)
56 1.1 hamajima {
57 1.1 hamajima return 1;
58 1.1 hamajima }
59 1.1 hamajima
60 1.1 hamajima static void
61 1.5 chs epwdog_attach(device_t parent, device_t self, void *aux)
62 1.1 hamajima {
63 1.5 chs struct epwdog_softc *sc = device_private(self);
64 1.1 hamajima struct epsoc_attach_args *sa = aux;
65 1.1 hamajima
66 1.1 hamajima printf("\n");
67 1.1 hamajima sc->sc_iot = sa->sa_iot;
68 1.1 hamajima
69 1.1 hamajima if (bus_space_map(sa->sa_iot, sa->sa_addr,
70 1.5 chs sa->sa_size, 0, &sc->sc_ioh)) {
71 1.5 chs printf("%s: Cannot map registers", device_xname(self));
72 1.1 hamajima return;
73 1.1 hamajima }
74 1.1 hamajima
75 1.1 hamajima if (!the_epwdog_sc)
76 1.1 hamajima the_epwdog_sc = sc;
77 1.1 hamajima #ifdef DIAGNOSTIC
78 1.1 hamajima else
79 1.5 chs printf("%s is already configured\n", device_xname(self));
80 1.3 hamajima #endif
81 1.3 hamajima }
82 1.1 hamajima
83 1.1 hamajima int
84 1.1 hamajima epwdog_reset(void)
85 1.1 hamajima {
86 1.1 hamajima struct epwdog_softc *sc = the_epwdog_sc;
87 1.1 hamajima
88 1.1 hamajima #ifdef DIAGNOSTIC
89 1.1 hamajima if (!sc) {
90 1.1 hamajima printf("epwdog not configured\n");
91 1.1 hamajima return (ENXIO);
92 1.1 hamajima }
93 1.1 hamajima #endif
94 1.1 hamajima
95 1.1 hamajima bus_space_write_2(sc->sc_iot, sc->sc_ioh,
96 1.1 hamajima EP93XX_WDOG_Ctrl, EP93XX_WDOG_DISABLE);
97 1.1 hamajima splhigh();
98 1.1 hamajima bus_space_write_2(sc->sc_iot, sc->sc_ioh,
99 1.1 hamajima EP93XX_WDOG_Ctrl, EP93XX_WDOG_ENABLE);
100 1.1 hamajima while (1);
101 1.1 hamajima
102 1.1 hamajima return 0; /* not reached */
103 1.1 hamajima }
104