1263320Sdim/* $NetBSD: ixp425_wdog.c,v 1.2 2008/04/28 20:23:14 martin Exp $ */ 2263320Sdim 3263320Sdim/*- 4263320Sdim * Copyright (c) 2006 The NetBSD Foundation, Inc. 5269012Semaste * All rights reserved. 6263320Sdim * 7263320Sdim * This code is derived from software contributed to The NetBSD Foundation 8263320Sdim * by Steve C. Woodford. 9263320Sdim * 10263320Sdim * Redistribution and use in source and binary forms, with or without 11263320Sdim * modification, are permitted provided that the following conditions 12263320Sdim * are met: 13263320Sdim * 1. Redistributions of source code must retain the above copyright 14263320Sdim * notice, this list of conditions and the following disclaimer. 15263320Sdim * 2. Redistributions in binary form must reproduce the above copyright 16263320Sdim * notice, this list of conditions and the following disclaimer in the 17263320Sdim * documentation and/or other materials provided with the distribution. 18263320Sdim * 19263320Sdim * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20263320Sdim * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21263320Sdim * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22263320Sdim * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "opt_ddb.h" 33 34#include <sys/cdefs.h> 35__KERNEL_RCSID(0, "$NetBSD: ixp425_wdog.c,v 1.2 2008/04/28 20:23:14 martin Exp $"); 36 37#include <sys/systm.h> 38#include <sys/param.h> 39#include <sys/kernel.h> 40#include <sys/device.h> 41#include <sys/wdog.h> 42 43#include <dev/clock_subr.h> 44#include <dev/sysmon/sysmonvar.h> 45 46#include <machine/intr.h> 47#include <sys/bus.h> 48 49#include <arm/xscale/ixp425reg.h> 50#include <arm/xscale/ixp425var.h> 51#include <arm/xscale/ixp425_sipvar.h> 52 53#ifdef DDB 54#include <machine/db_machdep.h> 55#include <ddb/db_extern.h> 56#endif 57 58struct ixpdog_softc { 59 struct device sc_dev; 60 struct sysmon_wdog sc_smw; 61 bus_space_tag_t sc_bust; 62 bus_space_handle_t sc_bush; 63 uint32_t sc_preset; 64 int sc_armed; 65}; 66 67#define IXPDOG_DEFAULT_PERIOD 8 68#ifndef IXP425_CLOCK_FREQ 69#define IXPDOG_COUNTS_PER_SEC 66666600 70#else 71#define IXPDOG_COUNTS_PER_SEC IXP425_CLOCK_FREQ 72#endif 73 74static int ixpdog_match(struct device *, struct cfdata *, void *); 75static void ixpdog_attach(struct device *, struct device *, void *); 76 77CFATTACH_DECL(ixpdog, sizeof(struct ixpdog_softc), 78 ixpdog_match, ixpdog_attach, NULL, NULL); 79 80static void ixpdog_control(struct ixpdog_softc *, int); 81static int ixpdog_tickle(struct sysmon_wdog *); 82static int ixpdog_setmode(struct sysmon_wdog *); 83 84#ifdef DDB 85static struct ixpdog_softc *ixpdog_softc; 86static void ixpdog_ddb_trap(int); 87#endif 88 89 90static int 91ixpdog_match(struct device *parent, struct cfdata *match, void *arg) 92{ 93 struct ixpsip_attach_args *sa = arg; 94 95 return (sa->sa_addr == IXP425_OST_WDOG_HWBASE); 96} 97 98static void 99ixpdog_attach(struct device *parent, struct device *self, void *arg) 100{ 101 struct ixpdog_softc *sc = (struct ixpdog_softc *)self; 102 struct ixpsip_attach_args *sa = arg; 103 104 aprint_naive("\n"); 105 aprint_normal(": Watchdog Timer\n"); 106 107 sc->sc_bust = sa->sa_iot; 108 109 if (bus_space_map(sc->sc_bust, sa->sa_addr, IXP425_OST_WDOG_SIZE, 0, 110 &sc->sc_bush)) { 111 aprint_error("%s: Failed to map watchdog registers\n", 112 sc->sc_dev.dv_xname); 113 return; 114 } 115 116 sc->sc_preset = IXPDOG_COUNTS_PER_SEC * hz * IXPDOG_DEFAULT_PERIOD; 117 sc->sc_armed = 0; 118 ixpdog_control(sc, 0); 119 120#ifdef DDB 121 ixpdog_softc = sc; 122 db_trap_callback = ixpdog_ddb_trap; 123#endif 124 125 sc->sc_smw.smw_name = sc->sc_dev.dv_xname; 126 sc->sc_smw.smw_cookie = sc; 127 sc->sc_smw.smw_setmode = ixpdog_setmode; 128 sc->sc_smw.smw_tickle = ixpdog_tickle; 129 sc->sc_smw.smw_period = IXPDOG_DEFAULT_PERIOD; 130 131 if (sysmon_wdog_register(&sc->sc_smw) != 0) 132 aprint_error("%s: unable to register watchdog with sysmon\n", 133 sc->sc_dev.dv_xname); 134} 135 136static void 137ixpdog_control(struct ixpdog_softc *sc, int enable) 138{ 139 uint32_t reg; 140 int s; 141 142 s = disable_interrupts(I32_bit); 143 bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY, 144 OST_WDOG_KEY_MAJICK); 145 reg = bus_space_read_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_ENAB); 146 147 if (!enable) 148 reg &= ~(OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA); 149 else { 150 bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG, 151 sc->sc_preset); 152 reg |= OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA; 153 } 154 155 bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_ENAB, reg); 156 bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY, 157 ~OST_WDOG_KEY_MAJICK); 158 restore_interrupts(s); 159} 160 161static int 162ixpdog_tickle(struct sysmon_wdog *smw) 163{ 164 struct ixpdog_softc *sc = smw->smw_cookie; 165 int s; 166 167 s = disable_interrupts(I32_bit); 168 bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY, 169 OST_WDOG_KEY_MAJICK); 170 bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG, 171 sc->sc_preset); 172 bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY, 173 ~OST_WDOG_KEY_MAJICK); 174 restore_interrupts(s); 175 176 return (0); 177} 178 179static int 180ixpdog_setmode(struct sysmon_wdog *smw) 181{ 182 struct ixpdog_softc *sc = smw->smw_cookie; 183 184 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) 185 sc->sc_armed = 0; 186 else { 187 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 188 smw->smw_period = IXPDOG_DEFAULT_PERIOD; 189 sc->sc_preset = IXPDOG_COUNTS_PER_SEC * hz * smw->smw_period; 190 if (sc->sc_preset < (IXPDOG_COUNTS_PER_SEC * hz) || 191 sc->sc_preset < smw->smw_period) 192 return (EOPNOTSUPP); 193 194 sc->sc_armed = 1; 195 } 196 197 ixpdog_control(sc, sc->sc_armed); 198 199 return (0); 200} 201 202#ifdef DDB 203static void 204ixpdog_ddb_trap(int enter) 205{ 206 struct ixpdog_softc *sc; 207 208 if ((sc = ixpdog_softc) == NULL) 209 return; 210 211 sc->sc_armed += enter ? (-1) : 1; 212 213 if ((enter && sc->sc_armed == 0) || (!enter && sc->sc_armed == 1)) 214 ixpdog_control(sc, sc->sc_armed); 215} 216#endif 217