1 /* $NetBSD: ixp425_wdog.c,v 1.4 2012/10/14 14:20:58 msaitoh 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 1.4 2012/10/14 14:20:58 msaitoh 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 58 struct ixpdog_softc { 59 struct sysmon_wdog sc_smw; 60 bus_space_tag_t sc_bust; 61 bus_space_handle_t sc_bush; 62 uint32_t sc_preset; 63 int sc_armed; 64 }; 65 66 #define IXPDOG_DEFAULT_PERIOD 8 67 #ifndef IXP425_CLOCK_FREQ 68 #define IXPDOG_COUNTS_PER_SEC 66666600 69 #else 70 #define IXPDOG_COUNTS_PER_SEC IXP425_CLOCK_FREQ 71 #endif 72 73 static int ixpdog_match(device_t, cfdata_t, void *); 74 static void ixpdog_attach(device_t, device_t, void *); 75 76 CFATTACH_DECL_NEW(ixpdog, sizeof(struct ixpdog_softc), 77 ixpdog_match, ixpdog_attach, NULL, NULL); 78 79 static void ixpdog_control(struct ixpdog_softc *, int); 80 static int ixpdog_tickle(struct sysmon_wdog *); 81 static int ixpdog_setmode(struct sysmon_wdog *); 82 83 #ifdef DDB 84 static struct ixpdog_softc *ixpdog_softc; 85 static void ixpdog_ddb_trap(int); 86 #endif 87 88 89 static int 90 ixpdog_match(device_t parent, cfdata_t cf, void *aux) 91 { 92 struct ixpsip_attach_args *sa = aux; 93 94 return (sa->sa_addr == IXP425_OST_WDOG_HWBASE); 95 } 96 97 static void 98 ixpdog_attach(device_t parent, device_t self, void *aux) 99 { 100 struct ixpdog_softc *sc = device_private(self); 101 struct ixpsip_attach_args *sa = aux; 102 103 aprint_naive("\n"); 104 aprint_normal(": Watchdog Timer\n"); 105 106 sc->sc_bust = sa->sa_iot; 107 108 if (bus_space_map(sc->sc_bust, sa->sa_addr, IXP425_OST_WDOG_SIZE, 0, 109 &sc->sc_bush)) { 110 aprint_error_dev(self, "Failed to map watchdog registers\n"); 111 return; 112 } 113 114 sc->sc_preset = IXPDOG_COUNTS_PER_SEC * hz * IXPDOG_DEFAULT_PERIOD; 115 sc->sc_armed = 0; 116 ixpdog_control(sc, 0); 117 118 #ifdef DDB 119 ixpdog_softc = sc; 120 db_trap_callback = ixpdog_ddb_trap; 121 #endif 122 123 sc->sc_smw.smw_name = device_xname(self); 124 sc->sc_smw.smw_cookie = sc; 125 sc->sc_smw.smw_setmode = ixpdog_setmode; 126 sc->sc_smw.smw_tickle = ixpdog_tickle; 127 sc->sc_smw.smw_period = IXPDOG_DEFAULT_PERIOD; 128 129 if (sysmon_wdog_register(&sc->sc_smw) != 0) 130 aprint_error_dev(self, "unable to register watchdog with sysmon\n"); 131 } 132 133 static void 134 ixpdog_control(struct ixpdog_softc *sc, int enable) 135 { 136 uint32_t reg; 137 int s; 138 139 s = disable_interrupts(I32_bit); 140 bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY, 141 OST_WDOG_KEY_MAJICK); 142 reg = bus_space_read_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_ENAB); 143 144 if (!enable) 145 reg &= ~(OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA); 146 else { 147 bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG, 148 sc->sc_preset); 149 reg |= OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA; 150 } 151 152 bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_ENAB, reg); 153 bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY, 154 ~OST_WDOG_KEY_MAJICK); 155 restore_interrupts(s); 156 } 157 158 static int 159 ixpdog_tickle(struct sysmon_wdog *smw) 160 { 161 struct ixpdog_softc *sc = smw->smw_cookie; 162 int s; 163 164 s = disable_interrupts(I32_bit); 165 bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY, 166 OST_WDOG_KEY_MAJICK); 167 bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG, 168 sc->sc_preset); 169 bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY, 170 ~OST_WDOG_KEY_MAJICK); 171 restore_interrupts(s); 172 173 return (0); 174 } 175 176 static int 177 ixpdog_setmode(struct sysmon_wdog *smw) 178 { 179 struct ixpdog_softc *sc = smw->smw_cookie; 180 181 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) 182 sc->sc_armed = 0; 183 else { 184 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 185 smw->smw_period = IXPDOG_DEFAULT_PERIOD; 186 sc->sc_preset = IXPDOG_COUNTS_PER_SEC * hz * smw->smw_period; 187 if (sc->sc_preset < (IXPDOG_COUNTS_PER_SEC * hz) || 188 sc->sc_preset < smw->smw_period) 189 return (EOPNOTSUPP); 190 191 sc->sc_armed = 1; 192 } 193 194 ixpdog_control(sc, sc->sc_armed); 195 196 return (0); 197 } 198 199 #ifdef DDB 200 static void 201 ixpdog_ddb_trap(int enter) 202 { 203 struct ixpdog_softc *sc; 204 205 if ((sc = ixpdog_softc) == NULL) 206 return; 207 208 sc->sc_armed += enter ? (-1) : 1; 209 210 if ((enter && sc->sc_armed == 0) || (!enter && sc->sc_armed == 1)) 211 ixpdog_control(sc, sc->sc_armed); 212 } 213 #endif 214
Indexes created Thu Oct 23 18:09:57 GMT 2025