wdog.c revision 1.2.2.2
1 1.2.2.2 gehenna /* $NetBSD: wdog.c,v 1.2.2.2 2002/08/31 13:45:45 gehenna Exp $ */ 2 1.2.2.2 gehenna 3 1.2.2.2 gehenna /* 4 1.2.2.2 gehenna * Copyright (c) 2002 Wasabi Systems, Inc. 5 1.2.2.2 gehenna * All rights reserved. 6 1.2.2.2 gehenna * 7 1.2.2.2 gehenna * Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc. 8 1.2.2.2 gehenna * 9 1.2.2.2 gehenna * Redistribution and use in source and binary forms, with or without 10 1.2.2.2 gehenna * modification, are permitted provided that the following conditions 11 1.2.2.2 gehenna * are met: 12 1.2.2.2 gehenna * 1. Redistributions of source code must retain the above copyright 13 1.2.2.2 gehenna * notice, this list of conditions and the following disclaimer. 14 1.2.2.2 gehenna * 2. Redistributions in binary form must reproduce the above copyright 15 1.2.2.2 gehenna * notice, this list of conditions and the following disclaimer in the 16 1.2.2.2 gehenna * documentation and/or other materials provided with the distribution. 17 1.2.2.2 gehenna * 3. All advertising materials mentioning features or use of this software 18 1.2.2.2 gehenna * must display the following acknowledgement: 19 1.2.2.2 gehenna * This product includes software developed for the NetBSD Project by 20 1.2.2.2 gehenna * Wasabi Systems, Inc. 21 1.2.2.2 gehenna * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 1.2.2.2 gehenna * or promote products derived from this software without specific prior 23 1.2.2.2 gehenna * written permission. 24 1.2.2.2 gehenna * 25 1.2.2.2 gehenna * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 1.2.2.2 gehenna * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 1.2.2.2 gehenna * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 1.2.2.2 gehenna * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 1.2.2.2 gehenna * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 1.2.2.2 gehenna * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 1.2.2.2 gehenna * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 1.2.2.2 gehenna * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 1.2.2.2 gehenna * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 1.2.2.2 gehenna * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 1.2.2.2 gehenna * POSSIBILITY OF SUCH DAMAGE. 36 1.2.2.2 gehenna */ 37 1.2.2.2 gehenna 38 1.2.2.2 gehenna /* 39 1.2.2.2 gehenna * Watchdog timer support for the IBM 405GP processor. 40 1.2.2.2 gehenna */ 41 1.2.2.2 gehenna 42 1.2.2.2 gehenna #include <sys/param.h> 43 1.2.2.2 gehenna #include <sys/systm.h> 44 1.2.2.2 gehenna #include <sys/device.h> 45 1.2.2.2 gehenna #include <sys/properties.h> 46 1.2.2.2 gehenna #include <sys/wdog.h> 47 1.2.2.2 gehenna 48 1.2.2.2 gehenna #include <powerpc/spr.h> 49 1.2.2.2 gehenna #include <powerpc/ibm4xx/dev/opbvar.h> 50 1.2.2.2 gehenna 51 1.2.2.2 gehenna #include <dev/sysmon/sysmonvar.h> 52 1.2.2.2 gehenna 53 1.2.2.2 gehenna static int wdog_match(struct device *, struct cfdata *, void *); 54 1.2.2.2 gehenna static void wdog_attach(struct device *, struct device *, void *); 55 1.2.2.2 gehenna static int wdog_tickle(struct sysmon_wdog *); 56 1.2.2.2 gehenna static int wdog_setmode(struct sysmon_wdog *); 57 1.2.2.2 gehenna 58 1.2.2.2 gehenna struct wdog_softc { 59 1.2.2.2 gehenna struct device sc_dev; 60 1.2.2.2 gehenna struct sysmon_wdog sc_smw; 61 1.2.2.2 gehenna int sc_wdog_armed; 62 1.2.2.2 gehenna int sc_wdog_period; 63 1.2.2.2 gehenna }; 64 1.2.2.2 gehenna 65 1.2.2.2 gehenna struct cfattach wdog_ca = { 66 1.2.2.2 gehenna sizeof(struct wdog_softc), wdog_match, wdog_attach, 67 1.2.2.2 gehenna }; 68 1.2.2.2 gehenna 69 1.2.2.2 gehenna static int 70 1.2.2.2 gehenna wdog_match(struct device *parent, struct cfdata *cf, void *aux) 71 1.2.2.2 gehenna { 72 1.2.2.2 gehenna struct opb_attach_args *oaa = aux; 73 1.2.2.2 gehenna 74 1.2.2.2 gehenna /* match only watchdog devices */ 75 1.2.2.2 gehenna if (strcmp(oaa->opb_name, cf->cf_driver->cd_name) != 0) 76 1.2.2.2 gehenna return (0); 77 1.2.2.2 gehenna 78 1.2.2.2 gehenna return (1); 79 1.2.2.2 gehenna } 80 1.2.2.2 gehenna 81 1.2.2.2 gehenna static void 82 1.2.2.2 gehenna wdog_attach(struct device *parent, struct device *self, void *aux) 83 1.2.2.2 gehenna { 84 1.2.2.2 gehenna struct wdog_softc *sc = (void *)self; 85 1.2.2.2 gehenna unsigned int processor_freq; 86 1.2.2.2 gehenna 87 1.2.2.2 gehenna if (board_info_get("processor-frequency", 88 1.2.2.2 gehenna &processor_freq, sizeof(processor_freq)) == -1) 89 1.2.2.2 gehenna processor_freq = 200 * 1000 * 1000; /* assume 200MHz */ 90 1.2.2.2 gehenna 91 1.2.2.2 gehenna sc->sc_wdog_period = (2LL << 29) / processor_freq; 92 1.2.2.2 gehenna printf(": %d second period\n", sc->sc_wdog_period); 93 1.2.2.2 gehenna 94 1.2.2.2 gehenna sc->sc_smw.smw_name = sc->sc_dev.dv_xname; 95 1.2.2.2 gehenna sc->sc_smw.smw_cookie = sc; 96 1.2.2.2 gehenna sc->sc_smw.smw_setmode = wdog_setmode; 97 1.2.2.2 gehenna sc->sc_smw.smw_tickle = wdog_tickle; 98 1.2.2.2 gehenna sc->sc_smw.smw_period = sc->sc_wdog_period; 99 1.2.2.2 gehenna 100 1.2.2.2 gehenna if (sysmon_wdog_register(&sc->sc_smw) != 0) 101 1.2.2.2 gehenna printf("%s: unable to register with sysmon\n", 102 1.2.2.2 gehenna sc->sc_dev.dv_xname); 103 1.2.2.2 gehenna 104 1.2.2.2 gehenna } 105 1.2.2.2 gehenna 106 1.2.2.2 gehenna static int 107 1.2.2.2 gehenna wdog_tickle(struct sysmon_wdog *smw) 108 1.2.2.2 gehenna { 109 1.2.2.2 gehenna uint32_t tsr; 110 1.2.2.2 gehenna 111 1.2.2.2 gehenna tsr = mfspr(SPR_TSR); 112 1.2.2.2 gehenna tsr |= TSR_ENW | TSR_WIS; 113 1.2.2.2 gehenna mtspr(SPR_TSR, tsr); 114 1.2.2.2 gehenna return (0); 115 1.2.2.2 gehenna } 116 1.2.2.2 gehenna 117 1.2.2.2 gehenna static int 118 1.2.2.2 gehenna wdog_setmode(struct sysmon_wdog *smw) 119 1.2.2.2 gehenna { 120 1.2.2.2 gehenna struct wdog_softc *sc = smw->smw_cookie; 121 1.2.2.2 gehenna uint32_t tcr, tsr; 122 1.2.2.2 gehenna 123 1.2.2.2 gehenna if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 124 1.2.2.2 gehenna if (sc->sc_wdog_armed) { 125 1.2.2.2 gehenna tsr = mfspr(SPR_TSR); 126 1.2.2.2 gehenna tsr &= ~(TSR_ENW | TSR_WIS); 127 1.2.2.2 gehenna mtspr(SPR_TSR, tsr); 128 1.2.2.2 gehenna } 129 1.2.2.2 gehenna } else { 130 1.2.2.2 gehenna if (smw->smw_period == WDOG_PERIOD_DEFAULT) 131 1.2.2.2 gehenna smw->smw_period = sc->sc_wdog_period; 132 1.2.2.2 gehenna else if (smw->smw_period != sc->sc_wdog_period) { 133 1.2.2.2 gehenna /* 134 1.2.2.2 gehenna * There's 4 set watchdog periods on the 405GP, 135 1.2.2.2 gehenna * but we only support the longest one (2.684 136 1.2.2.2 gehenna * seconds). 137 1.2.2.2 gehenna */ 138 1.2.2.2 gehenna return (EOPNOTSUPP); 139 1.2.2.2 gehenna } 140 1.2.2.2 gehenna sc->sc_wdog_armed = 1; 141 1.2.2.2 gehenna 142 1.2.2.2 gehenna tcr = mfspr(SPR_TCR); 143 1.2.2.2 gehenna tcr |= TCR_WP_2_29 | TCR_WRC_SYSTEM; 144 1.2.2.2 gehenna mtspr(SPR_TCR, tcr); 145 1.2.2.2 gehenna 146 1.2.2.2 gehenna /* Arm the watchdog. */ 147 1.2.2.2 gehenna wdog_tickle(smw); 148 1.2.2.2 gehenna } 149 1.2.2.2 gehenna return (0); 150 1.2.2.2 gehenna } 151
Indexes created Wed Oct 01 07:09:59 GMT 2025