1 /* $NetBSD: wdog.c,v 1.6 2002/10/02 15:52:28 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2002 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Watchdog timer support for the IBM 405GP processor. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/device.h> 45 #include <sys/properties.h> 46 #include <sys/wdog.h> 47 48 #include <powerpc/spr.h> 49 #include <powerpc/ibm4xx/dev/opbvar.h> 50 51 #include <dev/sysmon/sysmonvar.h> 52 53 static int wdog_match(struct device *, struct cfdata *, void *); 54 static void wdog_attach(struct device *, struct device *, void *); 55 static int wdog_tickle(struct sysmon_wdog *); 56 static int wdog_setmode(struct sysmon_wdog *); 57 58 struct wdog_softc { 59 struct device sc_dev; 60 struct sysmon_wdog sc_smw; 61 int sc_wdog_armed; 62 int sc_wdog_period; 63 }; 64 65 CFATTACH_DECL(wdog, sizeof(struct wdog_softc), 66 wdog_match, wdog_attach, NULL, NULL); 67 68 static int 69 wdog_match(struct device *parent, struct cfdata *cf, void *aux) 70 { 71 struct opb_attach_args *oaa = aux; 72 73 /* match only watchdog devices */ 74 if (strcmp(oaa->opb_name, cf->cf_name) != 0) 75 return (0); 76 77 return (1); 78 } 79 80 static void 81 wdog_attach(struct device *parent, struct device *self, void *aux) 82 { 83 struct wdog_softc *sc = (void *)self; 84 unsigned int processor_freq; 85 86 if (board_info_get("processor-frequency", 87 &processor_freq, sizeof(processor_freq)) == -1) 88 processor_freq = 200 * 1000 * 1000; /* assume 200MHz */ 89 90 sc->sc_wdog_period = (2LL << 29) / processor_freq; 91 printf(": %d second period\n", sc->sc_wdog_period); 92 93 sc->sc_smw.smw_name = sc->sc_dev.dv_xname; 94 sc->sc_smw.smw_cookie = sc; 95 sc->sc_smw.smw_setmode = wdog_setmode; 96 sc->sc_smw.smw_tickle = wdog_tickle; 97 sc->sc_smw.smw_period = sc->sc_wdog_period; 98 99 if (sysmon_wdog_register(&sc->sc_smw) != 0) 100 printf("%s: unable to register with sysmon\n", 101 sc->sc_dev.dv_xname); 102 103 } 104 105 static int 106 wdog_tickle(struct sysmon_wdog *smw) 107 { 108 uint32_t tsr; 109 110 tsr = mfspr(SPR_TSR); 111 tsr |= TSR_ENW | TSR_WIS; 112 mtspr(SPR_TSR, tsr); 113 return (0); 114 } 115 116 static int 117 wdog_setmode(struct sysmon_wdog *smw) 118 { 119 struct wdog_softc *sc = smw->smw_cookie; 120 uint32_t tcr, tsr; 121 122 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 123 if (sc->sc_wdog_armed) { 124 tsr = mfspr(SPR_TSR); 125 tsr &= ~(TSR_ENW | TSR_WIS); 126 mtspr(SPR_TSR, tsr); 127 } 128 } else { 129 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 130 smw->smw_period = sc->sc_wdog_period; 131 else if (smw->smw_period != sc->sc_wdog_period) { 132 /* 133 * There's 4 set watchdog periods on the 405GP, 134 * but we only support the longest one (2.684 135 * seconds). 136 */ 137 return (EOPNOTSUPP); 138 } 139 sc->sc_wdog_armed = 1; 140 141 tcr = mfspr(SPR_TCR); 142 tcr |= TCR_WP_2_29 | TCR_WRC_SYSTEM; 143 mtspr(SPR_TCR, tcr); 144 145 /* Arm the watchdog. */ 146 wdog_tickle(smw); 147 } 148 return (0); 149 } 150