1/* $NetBSD: admwdog.c,v 1.3 2011/07/01 18:38:49 dyoung Exp $ */ 2 3/*- 4 * Copyright (c) 2007 David Young. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or 7 * without modification, are permitted provided that the following 8 * conditions are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following 13 * disclaimer in the documentation and/or other materials provided 14 * with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 18 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 19 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 23 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 27 * OF SUCH DAMAGE. 28 */ 29 30#include <sys/cdefs.h> 31 32__KERNEL_RCSID(0, "$NetBSD: admwdog.c,v 1.3 2011/07/01 18:38:49 dyoung Exp $"); 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/device.h> 37#include <sys/wdog.h> 38#include <sys/kernel.h> /* for hz */ 39 40#include <sys/bus.h> 41 42#include <dev/sysmon/sysmonvar.h> 43 44#include <mips/adm5120/include/adm5120reg.h> 45#include <mips/adm5120/include/adm5120var.h> 46#include <mips/adm5120/include/adm5120_obiovar.h> 47#include <mips/adm5120/dev/if_admswvar.h> 48 49/* maximum watchdog period, seconds */ 50#define ADMWDOG_MAX_PERIOD (__SHIFTOUT_MASK(ADM5120_WDOG_WTS_MASK) / 100) 51 52static int admwdog_setmode(struct sysmon_wdog *smw); 53static int admwdog_tickle(struct sysmon_wdog *smw); 54 55static inline uint32_t 56admwdog_read(struct admsw_softc *sc) 57{ 58 return bus_space_read_4(sc->sc_st, sc->sc_ioh, ADM5120_WDOG0); 59} 60 61static inline void 62admwdog_write(struct admsw_softc *sc, uint32_t val) 63{ 64 bus_space_write_4(sc->sc_st, sc->sc_ioh, ADM5120_WDOG0, val); 65} 66 67static void 68admwdog_reset(struct admsw_softc *sc) 69{ 70 int s; 71 uint32_t wdog0; 72 73 wdog0 = __SHIFTIN(sc->sc_smw.smw_period * 100, ADM5120_WDOG_WTS_MASK) | 74 __SHIFTIN(1, ADM5120_WDOG_WT_MASK); 75 76 s = splhigh(); 77 78 admwdog_write(sc, wdog0); 79 (void)admwdog_read(sc); 80 admwdog_write(sc, ADM5120_WDOG0_WTTR | wdog0); 81 82 splx(s); 83} 84 85static int 86admwdog_setmode(struct sysmon_wdog *smw) 87{ 88 struct admsw_softc *sc = smw->smw_cookie; 89 90 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 91 admwdog_write(sc, 0); 92 return 0; 93 } 94 95 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 96 smw->smw_period = 32; 97 else if (smw->smw_period > ADMWDOG_MAX_PERIOD) 98 return EINVAL; 99 100 admwdog_reset(sc); 101 102 return 0; 103} 104 105static int 106admwdog_tickle(struct sysmon_wdog *smw) 107{ 108 struct admsw_softc *sc = smw->smw_cookie; 109 110 (void)admwdog_read(sc); 111 return 0; 112} 113 114void 115admwdog_attach(struct admsw_softc *sc) 116{ 117 struct sysmon_wdog *smw = &sc->sc_smw; 118 119 /* deactivate watchdog */ 120 admwdog_write(sc, 0); 121 122 smw->smw_name = device_xname(sc->sc_dev); 123 smw->smw_cookie = sc; 124 smw->smw_setmode = admwdog_setmode; 125 smw->smw_tickle = admwdog_tickle; 126 smw->smw_period = ADMWDOG_MAX_PERIOD; 127 128 sysmon_wdog_register(&sc->sc_smw); 129} 130