1 /* $NetBSD: wdog.c,v 1.10 2010/02/25 23:31:47 matt 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/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.10 2010/02/25 23:31:47 matt Exp $"); 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/device.h> 48 #include <sys/wdog.h> 49 50 #include <prop/proplib.h> 51 52 #include <powerpc/spr.h> 53 #include <powerpc/ibm4xx/spr.h> 54 #include <powerpc/ibm4xx/dev/opbvar.h> 55 56 #include <dev/sysmon/sysmonvar.h> 57 58 static int wdog_match(struct device *, struct cfdata *, void *); 59 static void wdog_attach(struct device *, struct device *, void *); 60 static int wdog_tickle(struct sysmon_wdog *); 61 static int wdog_setmode(struct sysmon_wdog *); 62 63 struct wdog_softc { 64 struct device sc_dev; 65 struct sysmon_wdog sc_smw; 66 int sc_wdog_armed; 67 int sc_wdog_period; 68 }; 69 70 CFATTACH_DECL(wdog, sizeof(struct wdog_softc), 71 wdog_match, wdog_attach, NULL, NULL); 72 73 static int 74 wdog_match(struct device *parent, struct cfdata *cf, void *aux) 75 { 76 struct opb_attach_args *oaa = aux; 77 78 /* match only watchdog devices */ 79 if (strcmp(oaa->opb_name, cf->cf_name) != 0) 80 return (0); 81 82 return (1); 83 } 84 85 static void 86 wdog_attach(struct device *parent, struct device *self, void *aux) 87 { 88 struct wdog_softc *sc = (void *)self; 89 unsigned int processor_freq; 90 prop_number_t freq; 91 92 freq = prop_dictionary_get(board_properties, "processor-frequency"); 93 KASSERT(freq != NULL); 94 processor_freq = (unsigned int) prop_number_integer_value(freq); 95 96 sc->sc_wdog_period = (2LL << 29) / processor_freq; 97 printf(": %d second period\n", sc->sc_wdog_period); 98 99 sc->sc_smw.smw_name = sc->sc_dev.dv_xname; 100 sc->sc_smw.smw_cookie = sc; 101 sc->sc_smw.smw_setmode = wdog_setmode; 102 sc->sc_smw.smw_tickle = wdog_tickle; 103 sc->sc_smw.smw_period = sc->sc_wdog_period; 104 105 if (sysmon_wdog_register(&sc->sc_smw) != 0) 106 printf("%s: unable to register with sysmon\n", 107 sc->sc_dev.dv_xname); 108 109 } 110 111 static int 112 wdog_tickle(struct sysmon_wdog *smw) 113 { 114 uint32_t tsr; 115 116 tsr = mfspr(SPR_TSR); 117 tsr |= TSR_ENW | TSR_WIS; 118 mtspr(SPR_TSR, tsr); 119 return (0); 120 } 121 122 static int 123 wdog_setmode(struct sysmon_wdog *smw) 124 { 125 struct wdog_softc *sc = smw->smw_cookie; 126 uint32_t tcr, tsr; 127 128 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 129 if (sc->sc_wdog_armed) { 130 tsr = mfspr(SPR_TSR); 131 tsr &= ~(TSR_ENW | TSR_WIS); 132 mtspr(SPR_TSR, tsr); 133 } 134 } else { 135 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 136 smw->smw_period = sc->sc_wdog_period; 137 else if (smw->smw_period != sc->sc_wdog_period) { 138 /* 139 * There's 4 set watchdog periods on the 405GP, 140 * but we only support the longest one (2.684 141 * seconds). 142 */ 143 return (EOPNOTSUPP); 144 } 145 sc->sc_wdog_armed = 1; 146 147 tcr = mfspr(SPR_TCR); 148 tcr |= TCR_WP_2_29 | TCR_WRC_SYSTEM; 149 mtspr(SPR_TCR, tcr); 150 151 /* Arm the watchdog. */ 152 wdog_tickle(smw); 153 } 154 return (0); 155 } 156