ixp425_wdog.c revision 1.1.56.1
1 /* $NetBSD: ixp425_wdog.c,v 1.1.56.1 2008/05/16 02:22:04 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Steve C. Woodford. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * 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 1.1.56.1 2008/05/16 02:22:04 yamt 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 <machine/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 58 struct 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 74 static int ixpdog_match(struct device *, struct cfdata *, void *); 75 static void ixpdog_attach(struct device *, struct device *, void *); 76 77 CFATTACH_DECL(ixpdog, sizeof(struct ixpdog_softc), 78 ixpdog_match, ixpdog_attach, NULL, NULL); 79 80 static void ixpdog_control(struct ixpdog_softc *, int); 81 static int ixpdog_tickle(struct sysmon_wdog *); 82 static int ixpdog_setmode(struct sysmon_wdog *); 83 84 #ifdef DDB 85 static struct ixpdog_softc *ixpdog_softc; 86 static void ixpdog_ddb_trap(int); 87 #endif 88 89 90 static int 91 ixpdog_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 98 static void 99 ixpdog_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 } 135 136 static void 137 ixpdog_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 } 160 161 static int 162 ixpdog_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 } 178 179 static int 180 ixpdog_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 203 static void 204 ixpdog_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
Indexes created Thu Oct 23 22:10:10 GMT 2025