geodewdg.c revision 1.2.4.2
1 1.2.4.2 chap /* $NetBSD: geodewdg.c,v 1.2.4.2 2006/06/19 03:44:26 chap Exp $ */ 2 1.2.4.2 chap 3 1.2.4.2 chap /*- 4 1.2.4.2 chap * Copyright (c) 2005 David Young. All rights reserved. 5 1.2.4.2 chap * 6 1.2.4.2 chap * This code was written by David Young. 7 1.2.4.2 chap * 8 1.2.4.2 chap * Redistribution and use in source and binary forms, with or without 9 1.2.4.2 chap * modification, are permitted provided that the following conditions 10 1.2.4.2 chap * are met: 11 1.2.4.2 chap * 1. Redistributions of source code must retain the above copyright 12 1.2.4.2 chap * notice, this list of conditions and the following disclaimer. 13 1.2.4.2 chap * 2. Redistributions in binary form must reproduce the above copyright 14 1.2.4.2 chap * notice, this list of conditions and the following disclaimer in the 15 1.2.4.2 chap * documentation and/or other materials provided with the distribution. 16 1.2.4.2 chap * 3. All advertising materials mentioning features or use of this software 17 1.2.4.2 chap * must display the following acknowledgement: 18 1.2.4.2 chap * This product includes software developed by David Young. 19 1.2.4.2 chap * 4. The name of David Young may not be used to endorse or promote 20 1.2.4.2 chap * products derived from this software without specific prior 21 1.2.4.2 chap * written permission. 22 1.2.4.2 chap * 23 1.2.4.2 chap * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY 24 1.2.4.2 chap * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 25 1.2.4.2 chap * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 26 1.2.4.2 chap * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID 27 1.2.4.2 chap * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 28 1.2.4.2 chap * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 1.2.4.2 chap * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 1.2.4.2 chap * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 31 1.2.4.2 chap * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 32 1.2.4.2 chap * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 1.2.4.2 chap * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 34 1.2.4.2 chap * OF SUCH DAMAGE. 35 1.2.4.2 chap */ 36 1.2.4.2 chap /*- 37 1.2.4.2 chap * Copyright (c) 2002 The NetBSD Foundation, Inc. 38 1.2.4.2 chap * All rights reserved. 39 1.2.4.2 chap * 40 1.2.4.2 chap * This code is derived from software contributed to The NetBSD Foundation 41 1.2.4.2 chap * by Jason R. Thorpe. 42 1.2.4.2 chap * 43 1.2.4.2 chap * Redistribution and use in source and binary forms, with or without 44 1.2.4.2 chap * modification, are permitted provided that the following conditions 45 1.2.4.2 chap * are met: 46 1.2.4.2 chap * 1. Redistributions of source code must retain the above copyright 47 1.2.4.2 chap * notice, this list of conditions and the following disclaimer. 48 1.2.4.2 chap * 2. Redistributions in binary form must reproduce the above copyright 49 1.2.4.2 chap * notice, this list of conditions and the following disclaimer in the 50 1.2.4.2 chap * documentation and/or other materials provided with the distribution. 51 1.2.4.2 chap * 3. All advertising materials mentioning features or use of this software 52 1.2.4.2 chap * must display the following acknowledgement: 53 1.2.4.2 chap * This product includes software developed by the NetBSD 54 1.2.4.2 chap * Foundation, Inc. and its contributors. 55 1.2.4.2 chap * 4. Neither the name of The NetBSD Foundation nor the names of its 56 1.2.4.2 chap * contributors may be used to endorse or promote products derived 57 1.2.4.2 chap * from this software without specific prior written permission. 58 1.2.4.2 chap * 59 1.2.4.2 chap * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 60 1.2.4.2 chap * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 61 1.2.4.2 chap * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 62 1.2.4.2 chap * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 63 1.2.4.2 chap * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 64 1.2.4.2 chap * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 65 1.2.4.2 chap * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 66 1.2.4.2 chap * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 67 1.2.4.2 chap * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 68 1.2.4.2 chap * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 69 1.2.4.2 chap * POSSIBILITY OF SUCH DAMAGE. 70 1.2.4.2 chap */ 71 1.2.4.2 chap 72 1.2.4.2 chap /* 73 1.2.4.2 chap * Device driver for the watchdog timer built into the 74 1.2.4.2 chap * AMD Geode SC1100 processor. 75 1.2.4.2 chap */ 76 1.2.4.2 chap 77 1.2.4.2 chap #include <sys/cdefs.h> 78 1.2.4.2 chap 79 1.2.4.2 chap __KERNEL_RCSID(0, "$NetBSD: geodewdg.c,v 1.2.4.2 2006/06/19 03:44:26 chap Exp $"); 80 1.2.4.2 chap 81 1.2.4.2 chap #include <sys/param.h> 82 1.2.4.2 chap #include <sys/systm.h> 83 1.2.4.2 chap #include <sys/device.h> 84 1.2.4.2 chap #include <sys/wdog.h> 85 1.2.4.2 chap #include <uvm/uvm_extern.h> 86 1.2.4.2 chap #include <machine/bus.h> 87 1.2.4.2 chap #include <dev/pci/pcivar.h> 88 1.2.4.2 chap #include <dev/pci/pcidevs.h> 89 1.2.4.2 chap #include <arch/i386/pci/geodevar.h> 90 1.2.4.2 chap #include <arch/i386/pci/geodereg.h> 91 1.2.4.2 chap #include <dev/sysmon/sysmonvar.h> 92 1.2.4.2 chap 93 1.2.4.2 chap #ifdef GEODE_DEBUG 94 1.2.4.2 chap #define GEODE_DPRINTF(__x) printf __x 95 1.2.4.2 chap #else /* GEODE_DEBUG */ 96 1.2.4.2 chap #define GEODE_DPRINTF(__x) /* nothing */ 97 1.2.4.2 chap #endif 98 1.2.4.2 chap 99 1.2.4.2 chap struct geode_wdog_softc { 100 1.2.4.2 chap struct device sc_dev; 101 1.2.4.2 chap struct geode_gcb_softc *sc_gcb_dev; 102 1.2.4.2 chap 103 1.2.4.2 chap uint16_t sc_countdown; 104 1.2.4.2 chap uint8_t sc_prescale; 105 1.2.4.2 chap struct sysmon_wdog sc_smw; 106 1.2.4.2 chap }; 107 1.2.4.2 chap 108 1.2.4.2 chap static int attached = 0; 109 1.2.4.2 chap 110 1.2.4.2 chap static void 111 1.2.4.2 chap geode_wdog_disable(struct geode_wdog_softc *sc) 112 1.2.4.2 chap { 113 1.2.4.2 chap uint16_t wdcnfg; 114 1.2.4.2 chap 115 1.2.4.2 chap /* cancel any pending countdown */ 116 1.2.4.2 chap sc->sc_countdown = 0; 117 1.2.4.2 chap bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDTO, 0); 118 1.2.4.2 chap /* power-down clock */ 119 1.2.4.2 chap wdcnfg = bus_space_read_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, 120 1.2.4.2 chap SC1100_GCB_WDCNFG); 121 1.2.4.2 chap 122 1.2.4.2 chap GEODE_DPRINTF(("%s: wdcnfg %#04" PRIx16 " -> ", __func__, wdcnfg)); 123 1.2.4.2 chap 124 1.2.4.2 chap wdcnfg |= SC1100_WDCNFG_WD32KPD; 125 1.2.4.2 chap wdcnfg &= ~(SC1100_WDCNFG_WDTYPE2_MASK | SC1100_WDCNFG_WDTYPE1_MASK); 126 1.2.4.2 chap /* This no-op is for the reader's benefit. */ 127 1.2.4.2 chap wdcnfg |= SC1100_WDCNFG_WDTYPE1_NOACTION | 128 1.2.4.2 chap SC1100_WDCNFG_WDTYPE2_NOACTION; 129 1.2.4.2 chap bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDCNFG, wdcnfg); 130 1.2.4.2 chap 131 1.2.4.2 chap GEODE_DPRINTF(("%#04" PRIx16 "\n", wdcnfg)); 132 1.2.4.2 chap } 133 1.2.4.2 chap 134 1.2.4.2 chap static void 135 1.2.4.2 chap geode_wdog_enable(struct geode_wdog_softc *sc) 136 1.2.4.2 chap { 137 1.2.4.2 chap uint16_t wdcnfg; 138 1.2.4.2 chap 139 1.2.4.2 chap /* power-up clock and set prescale */ 140 1.2.4.2 chap wdcnfg = bus_space_read_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDCNFG); 141 1.2.4.2 chap 142 1.2.4.2 chap GEODE_DPRINTF(("%s: wdcnfg %#04" PRIx16 " -> ", __func__, wdcnfg)); 143 1.2.4.2 chap 144 1.2.4.2 chap wdcnfg &= ~(SC1100_WDCNFG_WD32KPD | SC1100_WDCNFG_WDPRES_MASK | 145 1.2.4.2 chap SC1100_WDCNFG_WDTYPE1_MASK | SC1100_WDCNFG_WDTYPE2_MASK); 146 1.2.4.2 chap wdcnfg |= SHIFTIN(sc->sc_prescale, SC1100_WDCNFG_WDPRES_MASK); 147 1.2.4.2 chap wdcnfg |= SC1100_WDCNFG_WDTYPE1_RESET | SC1100_WDCNFG_WDTYPE2_NOACTION; 148 1.2.4.2 chap 149 1.2.4.2 chap bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDCNFG, wdcnfg); 150 1.2.4.2 chap 151 1.2.4.2 chap GEODE_DPRINTF(("%#04" PRIx16 "\n", wdcnfg)); 152 1.2.4.2 chap } 153 1.2.4.2 chap 154 1.2.4.2 chap static void 155 1.2.4.2 chap geode_wdog_reset(struct geode_wdog_softc *sc) 156 1.2.4.2 chap { 157 1.2.4.2 chap /* set countdown */ 158 1.2.4.2 chap bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDTO, 159 1.2.4.2 chap sc->sc_countdown); 160 1.2.4.2 chap } 161 1.2.4.2 chap 162 1.2.4.2 chap static int 163 1.2.4.2 chap geode_wdog_tickle(struct sysmon_wdog *smw) 164 1.2.4.2 chap { 165 1.2.4.2 chap int s; 166 1.2.4.2 chap struct geode_wdog_softc *sc = smw->smw_cookie; 167 1.2.4.2 chap 168 1.2.4.2 chap s = splhigh(); 169 1.2.4.2 chap geode_wdog_reset(sc); 170 1.2.4.2 chap splx(s); 171 1.2.4.2 chap return 0; 172 1.2.4.2 chap } 173 1.2.4.2 chap 174 1.2.4.2 chap static int 175 1.2.4.2 chap geode_wdog_setmode(struct sysmon_wdog *smw) 176 1.2.4.2 chap { 177 1.2.4.2 chap struct geode_wdog_softc *sc = smw->smw_cookie; 178 1.2.4.2 chap uint32_t ticks; 179 1.2.4.2 chap int prescale, s; 180 1.2.4.2 chap 181 1.2.4.2 chap if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 182 1.2.4.2 chap s = splhigh(); 183 1.2.4.2 chap geode_wdog_disable(sc); 184 1.2.4.2 chap splx(s); 185 1.2.4.2 chap return 0; 186 1.2.4.2 chap } 187 1.2.4.2 chap if (smw->smw_period == WDOG_PERIOD_DEFAULT) 188 1.2.4.2 chap smw->smw_period = 32; 189 1.2.4.2 chap else if (smw->smw_period > SC1100_WDIVL_MAX) /* too big? */ 190 1.2.4.2 chap return EINVAL; 191 1.2.4.2 chap 192 1.2.4.2 chap GEODE_DPRINTF(("%s: period %u\n", __func__, smw->smw_period)); 193 1.2.4.2 chap 194 1.2.4.2 chap ticks = smw->smw_period * SC1100_WDCLK_HZ; 195 1.2.4.2 chap 196 1.2.4.2 chap GEODE_DPRINTF(("%s: ticks0 %" PRIu32 "\n", __func__, ticks)); 197 1.2.4.2 chap 198 1.2.4.2 chap for (prescale = 0; ticks > UINT16_MAX; prescale++) 199 1.2.4.2 chap ticks /= 2; 200 1.2.4.2 chap 201 1.2.4.2 chap GEODE_DPRINTF(("%s: ticks %" PRIu32 "\n", __func__, ticks)); 202 1.2.4.2 chap GEODE_DPRINTF(("%s: prescale %d\n", __func__, prescale)); 203 1.2.4.2 chap 204 1.2.4.2 chap KASSERT(prescale <= SC1100_WDCNFG_WDPRES_MAX); 205 1.2.4.2 chap KASSERT(ticks <= UINT16_MAX); 206 1.2.4.2 chap 207 1.2.4.2 chap s = splhigh(); 208 1.2.4.2 chap 209 1.2.4.2 chap sc->sc_prescale = (uint8_t)prescale; 210 1.2.4.2 chap sc->sc_countdown = (uint16_t)ticks; 211 1.2.4.2 chap 212 1.2.4.2 chap geode_wdog_enable(sc); 213 1.2.4.2 chap 214 1.2.4.2 chap geode_wdog_reset(sc); 215 1.2.4.2 chap 216 1.2.4.2 chap splx(s); 217 1.2.4.2 chap return 0; 218 1.2.4.2 chap } 219 1.2.4.2 chap 220 1.2.4.2 chap static int 221 1.2.4.2 chap geode_wdog_match(struct device *parent, struct cfdata *match, void *aux) 222 1.2.4.2 chap { 223 1.2.4.2 chap return !attached; 224 1.2.4.2 chap } 225 1.2.4.2 chap 226 1.2.4.2 chap static void 227 1.2.4.2 chap geode_wdog_attach(struct device *parent, struct device *self, void *aux) 228 1.2.4.2 chap { 229 1.2.4.2 chap struct geode_wdog_softc *sc = (void *) self; 230 1.2.4.2 chap uint8_t wdsts; 231 1.2.4.2 chap 232 1.2.4.2 chap aprint_naive(": Watchdog Timer\n"); 233 1.2.4.2 chap aprint_normal(": AMD Geode SC1100 Watchdog Timer\n"); 234 1.2.4.2 chap 235 1.2.4.2 chap 236 1.2.4.2 chap /* 237 1.2.4.2 chap * Hook up the watchdog timer. 238 1.2.4.2 chap */ 239 1.2.4.2 chap sc->sc_gcb_dev = (struct geode_gcb_softc *)parent; 240 1.2.4.2 chap sc->sc_smw.smw_name = sc->sc_dev.dv_xname; 241 1.2.4.2 chap sc->sc_smw.smw_cookie = sc; 242 1.2.4.2 chap sc->sc_smw.smw_setmode = geode_wdog_setmode; 243 1.2.4.2 chap sc->sc_smw.smw_tickle = geode_wdog_tickle; 244 1.2.4.2 chap sc->sc_smw.smw_period = 32; 245 1.2.4.2 chap 246 1.2.4.2 chap /* 247 1.2.4.2 chap * Determine cause of the last reset, and issue a warning if it 248 1.2.4.2 chap * was due to watchdog expiry. 249 1.2.4.2 chap */ 250 1.2.4.2 chap wdsts = bus_space_read_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDSTS); 251 1.2.4.2 chap 252 1.2.4.2 chap GEODE_DPRINTF(("%s: status %#02" PRIx8 "\n", sc->sc_dev.dv_xname, 253 1.2.4.2 chap wdsts)); 254 1.2.4.2 chap 255 1.2.4.2 chap if (wdsts & SC1100_WDSTS_WDRST) 256 1.2.4.2 chap aprint_error( 257 1.2.4.2 chap "%s: WARNING: LAST RESET DUE TO WATCHDOG EXPIRATION!\n", 258 1.2.4.2 chap sc->sc_dev.dv_xname); 259 1.2.4.2 chap 260 1.2.4.2 chap /* reset WDOVF by writing 1 to it */ 261 1.2.4.2 chap bus_space_write_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDSTS, 262 1.2.4.2 chap wdsts & SC1100_WDSTS_WDOVF); 263 1.2.4.2 chap 264 1.2.4.2 chap if (sysmon_wdog_register(&sc->sc_smw) != 0) 265 1.2.4.2 chap aprint_error("%s: unable to register watchdog with sysmon\n", 266 1.2.4.2 chap sc->sc_dev.dv_xname); 267 1.2.4.2 chap 268 1.2.4.2 chap /* cancel any pending countdown */ 269 1.2.4.2 chap geode_wdog_disable(sc); 270 1.2.4.2 chap 271 1.2.4.2 chap attached = 1; 272 1.2.4.2 chap } 273 1.2.4.2 chap 274 1.2.4.2 chap CFATTACH_DECL(geodewdog, sizeof(struct geode_wdog_softc), 275 1.2.4.2 chap geode_wdog_match, geode_wdog_attach, NULL, NULL); 276
Indexes created Thu Oct 30 03:10:01 GMT 2025