wdog.c revision 1.3
1 /* $NetBSD: wdog.c,v 1.3 2006/08/29 02:35:44 gdamore Exp $ */ 2 /*- 3 * Copyright (c) 2006 Urbana-Champaign Independent Media Center. 4 * Copyright (c) 2006 Garrett D'Amore. 5 * All rights reserved. 6 * 7 * Portions of this code were written by Garrett D'Amore for the 8 * Champaign-Urbana Community Wireless Network Project. 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer in the documentation and/or other materials provided 18 * with the distribution. 19 * 3. All advertising materials mentioning features or use of this 20 * software must display the following acknowledgements: 21 * This product includes software developed by the Urbana-Champaign 22 * Independent Media Center. 23 * This product includes software developed by Garrett D'Amore. 24 * 4. Urbana-Champaign Independent Media Center's name and Garrett 25 * D'Amore's name may not be used to endorse or promote products 26 * derived from this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT 29 * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR 30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 31 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT 33 * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT, 34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 36 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 37 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 38 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 39 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 40 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 */ 42 /* 43 * Copyright (c) 2002 Wasabi Systems, Inc. 44 * All rights reserved. 45 * 46 * Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice, this list of conditions and the following disclaimer. 53 * 2. Redistributions in binary form must reproduce the above copyright 54 * notice, this list of conditions and the following disclaimer in the 55 * documentation and/or other materials provided with the distribution. 56 * 3. All advertising materials mentioning features or use of this software 57 * must display the following acknowledgement: 58 * This product includes software developed for the NetBSD Project by 59 * Wasabi Systems, Inc. 60 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 61 * or promote products derived from this software without specific prior 62 * written permission. 63 * 64 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 65 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 66 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 67 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 68 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 69 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 70 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 71 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 72 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 73 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 74 * POSSIBILITY OF SUCH DAMAGE. 75 */ 76 77 /* 78 * Watchdog timer support for the AR531x. 79 */ 80 81 #include <sys/cdefs.h> 82 __KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.3 2006/08/29 02:35:44 gdamore Exp $"); 83 84 #include <sys/param.h> 85 #include <sys/systm.h> 86 #include <sys/device.h> 87 #include <sys/wdog.h> 88 89 #include <machine/cpu.h> 90 91 #include <mips/atheros/include/ar531xvar.h> 92 93 #include <dev/sysmon/sysmonvar.h> 94 95 #ifndef WDOG_DEFAULT_PERIOD 96 #define WDOG_DEFAULT_PERIOD 5 97 #endif 98 99 static int wdog_match(struct device *, struct cfdata *, void *); 100 static void wdog_attach(struct device *, struct device *, void *); 101 static int wdog_tickle(struct sysmon_wdog *); 102 static int wdog_setmode(struct sysmon_wdog *); 103 104 struct wdog_softc { 105 struct device sc_dev; 106 struct sysmon_wdog sc_smw; 107 int sc_wdog_period; 108 int sc_wdog_max; 109 uint32_t sc_wdog_reload; 110 uint32_t sc_mult; 111 }; 112 113 CFATTACH_DECL(wdog, sizeof(struct wdog_softc), 114 wdog_match, wdog_attach, NULL, NULL); 115 116 static int 117 wdog_match(struct device *parent, struct cfdata *cf, void *aux) 118 { 119 120 return (1); 121 } 122 123 static void 124 wdog_attach(struct device *parent, struct device *self, void *aux) 125 { 126 struct wdog_softc *sc = (void *)self; 127 128 sc->sc_mult = ar531x_sys_freq(); 129 sc->sc_wdog_period = WDOG_DEFAULT_PERIOD; 130 sc->sc_wdog_max = 0xffffffffU / sc->sc_mult; 131 sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult; 132 printf(": %d second period\n", sc->sc_wdog_period); 133 134 sc->sc_smw.smw_name = sc->sc_dev.dv_xname; 135 sc->sc_smw.smw_cookie = sc; 136 sc->sc_smw.smw_setmode = wdog_setmode; 137 sc->sc_smw.smw_tickle = wdog_tickle; 138 sc->sc_smw.smw_period = sc->sc_wdog_period; 139 140 if (sysmon_wdog_register(&sc->sc_smw) != 0) 141 printf("%s: unable to register with sysmon\n", 142 sc->sc_dev.dv_xname); 143 } 144 145 static int 146 wdog_tickle(struct sysmon_wdog *smw) 147 { 148 struct wdog_softc *sc = smw->smw_cookie; 149 150 ar531x_wdog(sc->sc_wdog_reload); 151 return (0); 152 } 153 154 static int 155 wdog_setmode(struct sysmon_wdog *smw) 156 { 157 struct wdog_softc *sc = smw->smw_cookie; 158 159 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 160 ar531x_wdog(0); 161 } else { 162 163 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 164 smw->smw_period = sc->sc_wdog_period; 165 else if (smw->smw_period != sc->sc_wdog_period) { 166 /* 167 * we can't set watchdog periods in excess of 168 * the processor maximum. 169 */ 170 if (smw->smw_period > sc->sc_wdog_max) { 171 return EOPNOTSUPP; 172 } 173 sc->sc_wdog_period = smw->smw_period; 174 sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult; 175 } 176 177 ar531x_wdog(sc->sc_wdog_reload); 178 } 179 180 return (0); 181 } 182
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