1202375Srdivacky/* $NetBSD: wdog.c,v 1.6 2011/07/07 05:06:44 matt Exp $ */ 2202375Srdivacky/*- 3202375Srdivacky * Copyright (c) 2006 Urbana-Champaign Independent Media Center. 4202375Srdivacky * Copyright (c) 2006 Garrett D'Amore. 5202375Srdivacky * All rights reserved. 6202375Srdivacky * 7202375Srdivacky * Portions of this code were written by Garrett D'Amore for the 8202375Srdivacky * Champaign-Urbana Community Wireless Network Project. 9202375Srdivacky * 10202375Srdivacky * Redistribution and use in source and binary forms, with or 11202375Srdivacky * without modification, are permitted provided that the following 12202375Srdivacky * conditions are met: 13202375Srdivacky * 1. Redistributions of source code must retain the above copyright 14202375Srdivacky * notice, this list of conditions and the following disclaimer. 15202375Srdivacky * 2. Redistributions in binary form must reproduce the above 16202375Srdivacky * copyright notice, this list of conditions and the following 17202375Srdivacky * disclaimer in the documentation and/or other materials provided 18202375Srdivacky * with the distribution. 19202375Srdivacky * 3. All advertising materials mentioning features or use of this 20202375Srdivacky * software must display the following acknowledgements: 21202375Srdivacky * This product includes software developed by the Urbana-Champaign 22202375Srdivacky * Independent Media Center. 23202375Srdivacky * This product includes software developed by Garrett D'Amore. 24202375Srdivacky * 4. Urbana-Champaign Independent Media Center's name and Garrett 25202375Srdivacky * D'Amore's name may not be used to endorse or promote products 26202375Srdivacky * derived from this software without specific prior written permission. 27202375Srdivacky * 28202375Srdivacky * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT 29202375Srdivacky * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR 30202375Srdivacky * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 31202375Srdivacky * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32202375Srdivacky * ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT 33202375Srdivacky * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT, 34202375Srdivacky * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 35202375Srdivacky * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 36202375Srdivacky * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 37218893Sdim * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 38202375Srdivacky * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 39202375Srdivacky * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 40202375Srdivacky * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41202375Srdivacky */ 42202375Srdivacky/* 43202375Srdivacky * Copyright (c) 2002 Wasabi Systems, Inc. 44202375Srdivacky * All rights reserved. 45202375Srdivacky * 46202375Srdivacky * Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc. 47202375Srdivacky * 48202375Srdivacky * Redistribution and use in source and binary forms, with or without 49202375Srdivacky * modification, are permitted provided that the following conditions 50202375Srdivacky * are met: 51202375Srdivacky * 1. Redistributions of source code must retain the above copyright 52202375Srdivacky * notice, this list of conditions and the following disclaimer. 53202375Srdivacky * 2. Redistributions in binary form must reproduce the above copyright 54202375Srdivacky * notice, this list of conditions and the following disclaimer in the 55202375Srdivacky * documentation and/or other materials provided with the distribution. 56202375Srdivacky * 3. All advertising materials mentioning features or use of this software 57202375Srdivacky * must display the following acknowledgement: 58202375Srdivacky * This product includes software developed for the NetBSD Project by 59202375Srdivacky * Wasabi Systems, Inc. 60202375Srdivacky * 4. The name of Wasabi Systems, Inc. may not be used to endorse 61202375Srdivacky * or promote products derived from this software without specific prior 62202375Srdivacky * written permission. 63202375Srdivacky * 64202375Srdivacky * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 65202375Srdivacky * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 66202375Srdivacky * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 67202375Srdivacky * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 68202375Srdivacky * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 69202375Srdivacky * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 70202375Srdivacky * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 71202375Srdivacky * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 72202375Srdivacky * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 73202375Srdivacky * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 74202375Srdivacky * POSSIBILITY OF SUCH DAMAGE. 75202375Srdivacky */ 76202375Srdivacky 77202375Srdivacky/* 78202375Srdivacky * Watchdog timer support for the AR531x. 79202375Srdivacky */ 80202375Srdivacky 81202375Srdivacky#include <sys/cdefs.h> 82202375Srdivacky__KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.6 2011/07/07 05:06:44 matt Exp $"); 83202375Srdivacky 84202375Srdivacky#include <sys/param.h> 85202375Srdivacky#include <sys/cpu.h> 86202375Srdivacky#include <sys/device.h> 87202375Srdivacky#include <sys/wdog.h> 88202375Srdivacky 89202375Srdivacky#include <mips/atheros/include/platform.h> 90202375Srdivacky 91202375Srdivacky#include <dev/sysmon/sysmonvar.h> 92202375Srdivacky 93202375Srdivacky#ifndef WDOG_DEFAULT_PERIOD 94202375Srdivacky#define WDOG_DEFAULT_PERIOD 5 95202375Srdivacky#endif 96202375Srdivacky 97202375Srdivackystatic int wdog_match(device_t, cfdata_t, void *); 98202375Srdivackystatic void wdog_attach(device_t, device_t, void *); 99202375Srdivackystatic int wdog_tickle(struct sysmon_wdog *); 100202375Srdivackystatic int wdog_setmode(struct sysmon_wdog *); 101202375Srdivacky 102202375Srdivackystruct wdog_softc { 103202375Srdivacky struct sysmon_wdog sc_smw; 104202375Srdivacky int sc_wdog_period; 105202375Srdivacky int sc_wdog_max; 106202375Srdivacky uint32_t sc_wdog_reload; 107204642Srdivacky uint32_t sc_mult; 108202375Srdivacky}; 109202375Srdivacky 110203954SrdivackyCFATTACH_DECL_NEW(wdog, sizeof(struct wdog_softc), 111202375Srdivacky wdog_match, wdog_attach, NULL, NULL); 112202375Srdivacky 113202375Srdivackystatic int 114202375Srdivackywdog_match(device_t parent, struct cfdata *cf, void *aux) 115202375Srdivacky{ 116202375Srdivacky 117202375Srdivacky return (1); 118202375Srdivacky} 119202375Srdivacky 120202375Srdivackystatic void 121202375Srdivackywdog_attach(device_t parent, device_t self, void *aux) 122202375Srdivacky{ 123202375Srdivacky struct wdog_softc *sc = device_private(self); 124218893Sdim 125202375Srdivacky sc->sc_mult = atheros_get_bus_freq(); 126202375Srdivacky sc->sc_wdog_period = WDOG_DEFAULT_PERIOD; 127202375Srdivacky sc->sc_wdog_max = 0xffffffffU / sc->sc_mult; 128202375Srdivacky sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult; 129218893Sdim aprint_normal(": %d second period\n", sc->sc_wdog_period); 130218893Sdim 131202375Srdivacky sc->sc_smw.smw_name = device_xname(self); 132202375Srdivacky sc->sc_smw.smw_cookie = sc; 133202375Srdivacky sc->sc_smw.smw_setmode = wdog_setmode; 134202375Srdivacky sc->sc_smw.smw_tickle = wdog_tickle; 135202375Srdivacky sc->sc_smw.smw_period = sc->sc_wdog_period; 136202375Srdivacky 137202375Srdivacky if (sysmon_wdog_register(&sc->sc_smw) != 0) { 138202375Srdivacky aprint_error_dev(self, 139202375Srdivacky "unable to register with sysmon\n"); 140202375Srdivacky } 141203954Srdivacky} 142202375Srdivacky 143202375Srdivackystatic int 144202375Srdivackywdog_tickle(struct sysmon_wdog *smw) 145203954Srdivacky{ 146202375Srdivacky struct wdog_softc *sc = smw->smw_cookie; 147202375Srdivacky 148202375Srdivacky atheros_wdog_reload(sc->sc_wdog_reload); 149202375Srdivacky return (0); 150202375Srdivacky} 151202375Srdivacky 152202375Srdivackystatic int 153202375Srdivackywdog_setmode(struct sysmon_wdog *smw) 154202375Srdivacky{ 155202375Srdivacky struct wdog_softc *sc = smw->smw_cookie; 156202375Srdivacky 157202375Srdivacky if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 158202375Srdivacky atheros_wdog_reload(0); 159202375Srdivacky } else { 160202375Srdivacky 161202375Srdivacky if (smw->smw_period == WDOG_PERIOD_DEFAULT) 162202375Srdivacky smw->smw_period = sc->sc_wdog_period; 163202375Srdivacky else if (smw->smw_period != sc->sc_wdog_period) { 164202375Srdivacky /* 165202375Srdivacky * we can't set watchdog periods in excess of 166202375Srdivacky * the processor maximum. 167202375Srdivacky */ 168202375Srdivacky if (smw->smw_period > sc->sc_wdog_max) { 169202375Srdivacky return EOPNOTSUPP; 170202375Srdivacky } 171202375Srdivacky sc->sc_wdog_period = smw->smw_period; 172202375Srdivacky sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult; 173202375Srdivacky } 174202375Srdivacky 175202375Srdivacky atheros_wdog_reload(sc->sc_wdog_reload); 176202375Srdivacky } 177202375Srdivacky 178202375Srdivacky return (0); 179202375Srdivacky} 180202375Srdivacky