1 /*-
2 * Copyright (c) 2006 Sam Leffler. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24 #include <sys/cdefs.h>
25 __FBSDID("$FreeBSD: releng/8.4/sys/arm/xscale/ixp425/ixp425_wdog.c 186352 2008-12-20 03:26:09Z sam $");
26
27 /*
28 * IXP4XX Watchdog Timer Support.
29 */
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/time.h>
35 #include <sys/bus.h>
36 #include <sys/resource.h>
37 #include <sys/rman.h>
38 #include <sys/watchdog.h>
39
40 #include <machine/bus.h>
41 #include <machine/cpu.h>
42 #include <machine/cpufunc.h>
43 #include <machine/frame.h>
44 #include <machine/resource.h>
45 #include <machine/intr.h>
46
47 #include <arm/xscale/ixp425/ixp425reg.h>
48 #include <arm/xscale/ixp425/ixp425var.h>
49
50 struct ixpwdog_softc {
51 device_t sc_dev;
52 };
53
54 static __inline uint32_t
55 RD4(struct ixpwdog_softc *sc, bus_size_t off)
56 {
57 return bus_space_read_4(&ixp425_bs_tag, IXP425_TIMER_VBASE, off);
58 }
59
60 static __inline void
61 WR4(struct ixpwdog_softc *sc, bus_size_t off, uint32_t val)
62 {
63 bus_space_write_4(&ixp425_bs_tag, IXP425_TIMER_VBASE, off, val);
64 }
65
66 static void
67 ixp425_watchdog(void *arg, u_int cmd, int *error)
68 {
69 struct ixpwdog_softc *sc = arg;
70 u_int u = cmd & WD_INTERVAL;
71
72 WR4(sc, IXP425_OST_WDOG_KEY, OST_WDOG_KEY_MAJICK);
73 if (4 <= u && u <= 35) {
74 WR4(sc, IXP425_OST_WDOG_ENAB, 0);
75 /* approximate 66.66MHz cycles */
76 WR4(sc, IXP425_OST_WDOG, 2<<(u - 4));
77 /* NB: reset on timer expiration */
78 WR4(sc, IXP425_OST_WDOG_ENAB,
79 OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA);
80 *error = 0;
81 } else {
82 /* disable watchdog */
83 WR4(sc, IXP425_OST_WDOG_ENAB, 0);
84 }
85 WR4(sc, IXP425_OST_WDOG_KEY, 0);
86 }
87
88 static int
89 ixpwdog_probe(device_t dev)
90 {
91 device_set_desc(dev, "IXP4XX Watchdog Timer");
92 return (0);
93 }
94
95 static int
96 ixpwdog_attach(device_t dev)
97 {
98 struct ixpwdog_softc *sc = device_get_softc(dev);
99
100 sc->sc_dev = dev;
101
102 EVENTHANDLER_REGISTER(watchdog_list, ixp425_watchdog, sc, 0);
103 return (0);
104 }
105
106 static device_method_t ixpwdog_methods[] = {
107 DEVMETHOD(device_probe, ixpwdog_probe),
108 DEVMETHOD(device_attach, ixpwdog_attach),
109 {0, 0},
110 };
111
112 static driver_t ixpwdog_driver = {
113 "ixpwdog",
114 ixpwdog_methods,
115 sizeof(struct ixpwdog_softc),
116 };
117 static devclass_t ixpwdog_devclass;
118 DRIVER_MODULE(ixpwdog, ixp, ixpwdog_driver, ixpwdog_devclass, 0, 0);
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