1/* $NetBSD: admwdog.c,v 1.3 2011/07/01 18:38:49 dyoung Exp $ */
2
3/*-
4 * Copyright (c) 2007 David Young.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or
7 * without modification, are permitted provided that the following
8 * conditions 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
12 *    copyright notice, this list of conditions and the following
13 *    disclaimer in the documentation and/or other materials provided
14 *    with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
18 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
19 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
23 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
27 * OF SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__KERNEL_RCSID(0, "$NetBSD: admwdog.c,v 1.3 2011/07/01 18:38:49 dyoung Exp $");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/device.h>
37#include <sys/wdog.h>
38#include <sys/kernel.h>	/* for hz */
39
40#include <sys/bus.h>
41
42#include <dev/sysmon/sysmonvar.h>
43
44#include <mips/adm5120/include/adm5120reg.h>
45#include <mips/adm5120/include/adm5120var.h>
46#include <mips/adm5120/include/adm5120_obiovar.h>
47#include <mips/adm5120/dev/if_admswvar.h>
48
49/* maximum watchdog period, seconds */
50#define	ADMWDOG_MAX_PERIOD	(__SHIFTOUT_MASK(ADM5120_WDOG_WTS_MASK) / 100)
51
52static int admwdog_setmode(struct sysmon_wdog *smw);
53static int admwdog_tickle(struct sysmon_wdog *smw);
54
55static inline uint32_t
56admwdog_read(struct admsw_softc *sc)
57{
58	return bus_space_read_4(sc->sc_st, sc->sc_ioh, ADM5120_WDOG0);
59}
60
61static inline void
62admwdog_write(struct admsw_softc *sc, uint32_t val)
63{
64	bus_space_write_4(sc->sc_st, sc->sc_ioh, ADM5120_WDOG0, val);
65}
66
67static void
68admwdog_reset(struct admsw_softc *sc)
69{
70	int s;
71	uint32_t wdog0;
72
73	wdog0 = __SHIFTIN(sc->sc_smw.smw_period * 100, ADM5120_WDOG_WTS_MASK) |
74	    __SHIFTIN(1, ADM5120_WDOG_WT_MASK);
75
76	s = splhigh();
77
78	admwdog_write(sc, wdog0);
79	(void)admwdog_read(sc);
80	admwdog_write(sc, ADM5120_WDOG0_WTTR | wdog0);
81
82	splx(s);
83}
84
85static int
86admwdog_setmode(struct sysmon_wdog *smw)
87{
88	struct admsw_softc *sc = smw->smw_cookie;
89
90	if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
91		admwdog_write(sc, 0);
92		return 0;
93	}
94
95	if (smw->smw_period == WDOG_PERIOD_DEFAULT)
96		smw->smw_period = 32;
97	else if (smw->smw_period > ADMWDOG_MAX_PERIOD)
98		return EINVAL;
99
100	admwdog_reset(sc);
101
102	return 0;
103}
104
105static int
106admwdog_tickle(struct sysmon_wdog *smw)
107{
108	struct admsw_softc *sc = smw->smw_cookie;
109
110	(void)admwdog_read(sc);
111	return 0;
112}
113
114void
115admwdog_attach(struct admsw_softc *sc)
116{
117	struct sysmon_wdog *smw = &sc->sc_smw;
118
119	/* deactivate watchdog */
120	admwdog_write(sc, 0);
121
122	smw->smw_name = device_xname(sc->sc_dev);
123	smw->smw_cookie = sc;
124	smw->smw_setmode = admwdog_setmode;
125	smw->smw_tickle = admwdog_tickle;
126	smw->smw_period = ADMWDOG_MAX_PERIOD;
127
128	sysmon_wdog_register(&sc->sc_smw);
129}
130