1/*	$NetBSD: epwdog.c,v 1.3 2006/08/21 15:01:54 hamajima Exp $	*/
2
3/*
4 * Copyright (c) 2005 HAMAJIMA Katsuomi. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__KERNEL_RCSID(0, "$NetBSD: epwdog.c,v 1.3 2006/08/21 15:01:54 hamajima Exp $");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/device.h>
35#include <sys/bus.h>
36#include <arm/ep93xx/ep93xxvar.h>
37#include <arm/ep93xx/epsocvar.h>
38#include <arm/ep93xx/epwdogreg.h>
39#include <arm/ep93xx/epwdogvar.h>
40
41struct epwdog_softc {
42	struct device		sc_dev;
43	bus_space_tag_t		sc_iot;
44	bus_space_handle_t	sc_ioh;
45};
46
47static int epwdog_match(struct device *, struct cfdata *, void *);
48static void epwdog_attach(struct device *, struct device *, void *);
49
50CFATTACH_DECL(epwdog, sizeof(struct epwdog_softc),
51	      epwdog_match, epwdog_attach, NULL, NULL);
52
53static struct epwdog_softc *the_epwdog_sc = 0;
54
55static int
56epwdog_match(struct device *parent, struct cfdata *match, void *aux)
57{
58	return 1;
59}
60
61static void
62epwdog_attach(struct device *parent, struct device *self, void *aux)
63{
64	struct epwdog_softc *sc = (struct epwdog_softc*)self;
65	struct epsoc_attach_args *sa = aux;
66
67	printf("\n");
68	sc->sc_iot = sa->sa_iot;
69
70	if (bus_space_map(sa->sa_iot, sa->sa_addr,
71			  sa->sa_size, 0, &sc->sc_ioh)){
72		printf("%s: Cannot map registers", self->dv_xname);
73		return;
74	}
75
76	if (!the_epwdog_sc)
77		the_epwdog_sc = sc;
78#ifdef DIAGNOSTIC
79	else
80		printf("%s is already configured\n", sc->sc_dev.dv_xname);
81#endif
82}
83
84int
85epwdog_reset(void)
86{
87	struct epwdog_softc *sc = the_epwdog_sc;
88
89#ifdef DIAGNOSTIC
90	if (!sc) {
91		printf("epwdog not configured\n");
92		return (ENXIO);
93	}
94#endif
95
96	bus_space_write_2(sc->sc_iot, sc->sc_ioh,
97			  EP93XX_WDOG_Ctrl, EP93XX_WDOG_DISABLE);
98	splhigh();
99	bus_space_write_2(sc->sc_iot, sc->sc_ioh,
100			  EP93XX_WDOG_Ctrl, EP93XX_WDOG_ENABLE);
101	while (1);
102
103	return 0; /* not reached */
104}
105