1 /*- 2 * Copyright (c) 2004 Texas A&M University 3 * All rights reserved. 4 * 5 * Developer: Wm. Daryl Hawkins 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * Intel ICH Watchdog Timer (WDT) driver 31 * 32 * Originally developed by Wm. Daryl Hawkins of Texas A&M 33 * Heavily modified by <des@FreeBSD.org> 34 * 35 * This is a tricky one. The ICH WDT can't be treated as a regular PCI 36 * device as it's actually an integrated function of the ICH LPC interface 37 * bridge. Detection is also awkward, because we can only infer the 38 * presence of the watchdog timer from the fact that the machine has an 39 * ICH chipset, or, on ACPI 2.x systems, by the presence of the 'WDDT' 40 * ACPI table (although this driver does not support the ACPI detection 41 * method). 42 * 43 * There is one slight problem on non-ACPI or ACPI 1.x systems: we have no 44 * way of knowing if the WDT is permanently disabled (either by the BIOS 45 * or in hardware). 46 * 47 * The WDT is programmed through I/O registers in the ACPI I/O space. 48 * Intel swears it's always at offset 0x60, so we use that. 49 * 50 * For details about the ICH WDT, see Intel Application Note AP-725 51 * (document no. 292273-001). The WDT is also described in the individual 52 * chipset datasheets, e.g. Intel82801EB ICH5 / 82801ER ICH5R Datasheet 53 * (document no. 252516-001) sections 9.10 and 9.11. 54 * 55 * ICH6/7/8 support by Takeharu KATO <takeharu1219@ybb.ne.jp> 56 * 57 * $FreeBSD: src/sys/dev/ichwd/ichwd.c,v 1.34 2012/01/05 16:27:32 jhb Exp $ 58 */ 59 60 #include <sys/param.h> 61 #include <sys/kernel.h> 62 #include <sys/module.h> 63 #include <sys/systm.h> 64 #include <sys/bus.h> 65 #include <sys/rman.h> 66 #include <sys/resource.h> 67 #include <sys/wdog.h> 68 69 #include <bus/isa/isavar.h> 70 #include <bus/pci/pcivar.h> 71 72 #include "ichwd.h" 73 74 static struct ichwd_device ichwd_devices[] = { 75 { DEVICEID_82801AA, "Intel 82801AA watchdog timer", 1 }, 76 { DEVICEID_82801AB, "Intel 82801AB watchdog timer", 1 }, 77 { DEVICEID_82801BA, "Intel 82801BA watchdog timer", 2 }, 78 { DEVICEID_82801BAM, "Intel 82801BAM watchdog timer", 2 }, 79 { DEVICEID_82801CA, "Intel 82801CA watchdog timer", 3 }, 80 { DEVICEID_82801CAM, "Intel 82801CAM watchdog timer", 3 }, 81 { DEVICEID_82801DB, "Intel 82801DB watchdog timer", 4 }, 82 { DEVICEID_82801DBM, "Intel 82801DBM watchdog timer", 4 }, 83 { DEVICEID_82801E, "Intel 82801E watchdog timer", 5 }, 84 { DEVICEID_82801EB, "Intel 82801EB watchdog timer", 5 }, 85 { DEVICEID_82801EBR, "Intel 82801EB/ER watchdog timer", 5 }, 86 { DEVICEID_6300ESB, "Intel 6300ESB watchdog timer", 5 }, 87 { DEVICEID_82801FBR, "Intel 82801FB/FR watchdog timer", 6 }, 88 { DEVICEID_ICH6M, "Intel ICH6M watchdog timer", 6 }, 89 { DEVICEID_ICH6W, "Intel ICH6W watchdog timer", 6 }, 90 { DEVICEID_ICH7, "Intel ICH7 watchdog timer", 7 }, 91 { DEVICEID_ICH7DH, "Intel ICH7DH watchdog timer", 7 }, 92 { DEVICEID_ICH7M, "Intel ICH7M watchdog timer", 7 }, 93 { DEVICEID_ICH7MDH, "Intel ICH7MDH watchdog timer", 7 }, 94 { DEVICEID_NM10, "Intel NM10 watchdog timer", 7 }, 95 { DEVICEID_ICH8, "Intel ICH8 watchdog timer", 8 }, 96 { DEVICEID_ICH8DH, "Intel ICH8DH watchdog timer", 8 }, 97 { DEVICEID_ICH8DO, "Intel ICH8DO watchdog timer", 8 }, 98 { DEVICEID_ICH8M, "Intel ICH8M watchdog timer", 8 }, 99 { DEVICEID_ICH8ME, "Intel ICH8M-E watchdog timer", 8 }, 100 { DEVICEID_63XXESB, "Intel 63XXESB watchdog timer", 8 }, 101 { DEVICEID_ICH9, "Intel ICH9 watchdog timer", 9 }, 102 { DEVICEID_ICH9DH, "Intel ICH9DH watchdog timer", 9 }, 103 { DEVICEID_ICH9DO, "Intel ICH9DO watchdog timer", 9 }, 104 { DEVICEID_ICH9M, "Intel ICH9M watchdog timer", 9 }, 105 { DEVICEID_ICH9ME, "Intel ICH9M-E watchdog timer", 9 }, 106 { DEVICEID_ICH9R, "Intel ICH9R watchdog timer", 9 }, 107 { DEVICEID_ICH10, "Intel ICH10 watchdog timer", 10 }, 108 { DEVICEID_ICH10D, "Intel ICH10D watchdog timer", 10 }, 109 { DEVICEID_ICH10DO, "Intel ICH10DO watchdog timer", 10 }, 110 { DEVICEID_ICH10R, "Intel ICH10R watchdog timer", 10 }, 111 { DEVICEID_PCH, "Intel PCH watchdog timer", 10 }, 112 { DEVICEID_PCHM, "Intel PCH watchdog timer", 10 }, 113 { DEVICEID_P55, "Intel P55 watchdog timer", 10 }, 114 { DEVICEID_PM55, "Intel PM55 watchdog timer", 10 }, 115 { DEVICEID_H55, "Intel H55 watchdog timer", 10 }, 116 { DEVICEID_QM57, "Intel QM57 watchdog timer", 10 }, 117 { DEVICEID_H57, "Intel H57 watchdog timer", 10 }, 118 { DEVICEID_HM55, "Intel HM55 watchdog timer", 10 }, 119 { DEVICEID_Q57, "Intel Q57 watchdog timer", 10 }, 120 { DEVICEID_HM57, "Intel HM57 watchdog timer", 10 }, 121 { DEVICEID_PCHMSFF, "Intel PCHMSFF watchdog timer", 10 }, 122 { DEVICEID_QS57, "Intel QS57 watchdog timer", 10 }, 123 { DEVICEID_3400, "Intel 3400 watchdog timer", 10 }, 124 { DEVICEID_3420, "Intel 3420 watchdog timer", 10 }, 125 { DEVICEID_3450, "Intel 3450 watchdog timer", 10 }, 126 { DEVICEID_CPT0, "Intel Cougar Point watchdog timer", 10 }, 127 { DEVICEID_CPT1, "Intel Cougar Point watchdog timer", 10 }, 128 { DEVICEID_CPT2, "Intel Cougar Point watchdog timer", 10 }, 129 { DEVICEID_CPT3, "Intel Cougar Point watchdog timer", 10 }, 130 { DEVICEID_CPT4, "Intel Cougar Point watchdog timer", 10 }, 131 { DEVICEID_CPT5, "Intel Cougar Point watchdog timer", 10 }, 132 { DEVICEID_CPT6, "Intel Cougar Point watchdog timer", 10 }, 133 { DEVICEID_CPT7, "Intel Cougar Point watchdog timer", 10 }, 134 { DEVICEID_CPT8, "Intel Cougar Point watchdog timer", 10 }, 135 { DEVICEID_CPT9, "Intel Cougar Point watchdog timer", 10 }, 136 { DEVICEID_CPT10, "Intel Cougar Point watchdog timer", 10 }, 137 { DEVICEID_CPT11, "Intel Cougar Point watchdog timer", 10 }, 138 { DEVICEID_CPT12, "Intel Cougar Point watchdog timer", 10 }, 139 { DEVICEID_CPT13, "Intel Cougar Point watchdog timer", 10 }, 140 { DEVICEID_CPT14, "Intel Cougar Point watchdog timer", 10 }, 141 { DEVICEID_CPT15, "Intel Cougar Point watchdog timer", 10 }, 142 { DEVICEID_CPT16, "Intel Cougar Point watchdog timer", 10 }, 143 { DEVICEID_CPT17, "Intel Cougar Point watchdog timer", 10 }, 144 { DEVICEID_CPT18, "Intel Cougar Point watchdog timer", 10 }, 145 { DEVICEID_CPT19, "Intel Cougar Point watchdog timer", 10 }, 146 { DEVICEID_CPT20, "Intel Cougar Point watchdog timer", 10 }, 147 { DEVICEID_CPT21, "Intel Cougar Point watchdog timer", 10 }, 148 { DEVICEID_CPT22, "Intel Cougar Point watchdog timer", 10 }, 149 { DEVICEID_CPT23, "Intel Cougar Point watchdog timer", 10 }, 150 { DEVICEID_CPT23, "Intel Cougar Point watchdog timer", 10 }, 151 { DEVICEID_CPT25, "Intel Cougar Point watchdog timer", 10 }, 152 { DEVICEID_CPT26, "Intel Cougar Point watchdog timer", 10 }, 153 { DEVICEID_CPT27, "Intel Cougar Point watchdog timer", 10 }, 154 { DEVICEID_CPT28, "Intel Cougar Point watchdog timer", 10 }, 155 { DEVICEID_CPT29, "Intel Cougar Point watchdog timer", 10 }, 156 { DEVICEID_CPT30, "Intel Cougar Point watchdog timer", 10 }, 157 { DEVICEID_CPT31, "Intel Cougar Point watchdog timer", 10 }, 158 { DEVICEID_PATSBURG_LPC1, "Intel Patsburg watchdog timer", 10 }, 159 { DEVICEID_PATSBURG_LPC2, "Intel Patsburg watchdog timer", 10 }, 160 { DEVICEID_PPT0, "Intel Panther Point watchdog timer", 10 }, 161 { DEVICEID_PPT1, "Intel Panther Point watchdog timer", 10 }, 162 { DEVICEID_PPT2, "Intel Panther Point watchdog timer", 10 }, 163 { DEVICEID_PPT3, "Intel Panther Point watchdog timer", 10 }, 164 { DEVICEID_PPT4, "Intel Panther Point watchdog timer", 10 }, 165 { DEVICEID_PPT5, "Intel Panther Point watchdog timer", 10 }, 166 { DEVICEID_PPT6, "Intel Panther Point watchdog timer", 10 }, 167 { DEVICEID_PPT7, "Intel Panther Point watchdog timer", 10 }, 168 { DEVICEID_PPT8, "Intel Panther Point watchdog timer", 10 }, 169 { DEVICEID_PPT9, "Intel Panther Point watchdog timer", 10 }, 170 { DEVICEID_PPT10, "Intel Panther Point watchdog timer", 10 }, 171 { DEVICEID_PPT11, "Intel Panther Point watchdog timer", 10 }, 172 { DEVICEID_PPT12, "Intel Panther Point watchdog timer", 10 }, 173 { DEVICEID_PPT13, "Intel Panther Point watchdog timer", 10 }, 174 { DEVICEID_PPT14, "Intel Panther Point watchdog timer", 10 }, 175 { DEVICEID_PPT15, "Intel Panther Point watchdog timer", 10 }, 176 { DEVICEID_PPT16, "Intel Panther Point watchdog timer", 10 }, 177 { DEVICEID_PPT17, "Intel Panther Point watchdog timer", 10 }, 178 { DEVICEID_PPT18, "Intel Panther Point watchdog timer", 10 }, 179 { DEVICEID_PPT19, "Intel Panther Point watchdog timer", 10 }, 180 { DEVICEID_PPT20, "Intel Panther Point watchdog timer", 10 }, 181 { DEVICEID_PPT21, "Intel Panther Point watchdog timer", 10 }, 182 { DEVICEID_PPT22, "Intel Panther Point watchdog timer", 10 }, 183 { DEVICEID_PPT23, "Intel Panther Point watchdog timer", 10 }, 184 { DEVICEID_PPT24, "Intel Panther Point watchdog timer", 10 }, 185 { DEVICEID_PPT25, "Intel Panther Point watchdog timer", 10 }, 186 { DEVICEID_PPT26, "Intel Panther Point watchdog timer", 10 }, 187 { DEVICEID_PPT27, "Intel Panther Point watchdog timer", 10 }, 188 { DEVICEID_PPT28, "Intel Panther Point watchdog timer", 10 }, 189 { DEVICEID_PPT29, "Intel Panther Point watchdog timer", 10 }, 190 { DEVICEID_PPT30, "Intel Panther Point watchdog timer", 10 }, 191 { DEVICEID_PPT31, "Intel Panther Point watchdog timer", 10 }, 192 { DEVICEID_DH89XXCC_LPC, "Intel DH89xxCC watchdog timer", 10 }, 193 { 0, NULL, 0 }, 194 }; 195 196 static devclass_t ichwd_devclass; 197 198 static struct ichwd_softc ichwd_sc; 199 200 #define ichwd_read_tco_1(sc, off) \ 201 bus_read_1((sc)->tco_res, (off)) 202 #define ichwd_read_tco_2(sc, off) \ 203 bus_read_2((sc)->tco_res, (off)) 204 #define ichwd_read_tco_4(sc, off) \ 205 bus_read_4((sc)->tco_res, (off)) 206 #define ichwd_read_smi_4(sc, off) \ 207 bus_read_4((sc)->smi_res, (off)) 208 #define ichwd_read_gcs_4(sc, off) \ 209 bus_read_4((sc)->gcs_res, (off)) 210 211 #define ichwd_write_tco_1(sc, off, val) \ 212 bus_write_1((sc)->tco_res, (off), (val)) 213 #define ichwd_write_tco_2(sc, off, val) \ 214 bus_write_2((sc)->tco_res, (off), (val)) 215 #define ichwd_write_tco_4(sc, off, val) \ 216 bus_write_4((sc)->tco_res, (off), (val)) 217 #define ichwd_write_smi_4(sc, off, val) \ 218 bus_write_4((sc)->smi_res, (off), (val)) 219 #define ichwd_write_gcs_4(sc, off, val) \ 220 bus_write_4((sc)->gcs_res, (off), (val)) 221 222 #define ichwd_verbose_printf(dev, ...) \ 223 do { \ 224 if (bootverbose) \ 225 device_printf(dev, __VA_ARGS__);\ 226 } while (0) 227 228 /* 229 * Disable the watchdog timeout SMI handler. 230 * 231 * Apparently, some BIOSes install handlers that reset or disable the 232 * watchdog timer instead of resetting the system, so we disable the SMI 233 * (by clearing the SMI_TCO_EN bit of the SMI_EN register) to prevent this 234 * from happening. 235 */ 236 static __inline void 237 ichwd_smi_disable(struct ichwd_softc *sc) 238 { 239 ichwd_write_smi_4(sc, SMI_EN, ichwd_read_smi_4(sc, SMI_EN) & ~SMI_TCO_EN); 240 } 241 242 /* 243 * Enable the watchdog timeout SMI handler. See above for details. 244 */ 245 static __inline void 246 ichwd_smi_enable(struct ichwd_softc *sc) 247 { 248 ichwd_write_smi_4(sc, SMI_EN, ichwd_read_smi_4(sc, SMI_EN) | SMI_TCO_EN); 249 } 250 251 /* 252 * Check if the watchdog SMI triggering is enabled. 253 */ 254 static __inline int 255 ichwd_smi_is_enabled(struct ichwd_softc *sc) 256 { 257 return ((ichwd_read_smi_4(sc, SMI_EN) & SMI_TCO_EN) != 0); 258 } 259 260 /* 261 * Reset the watchdog status bits. 262 */ 263 static __inline void 264 ichwd_sts_reset(struct ichwd_softc *sc) 265 { 266 /* 267 * The watchdog status bits are set to 1 by the hardware to 268 * indicate various conditions. They can be cleared by software 269 * by writing a 1, not a 0. 270 */ 271 ichwd_write_tco_2(sc, TCO1_STS, TCO_TIMEOUT); 272 /* 273 * According to Intel's docs, clearing SECOND_TO_STS and BOOT_STS must 274 * be done in two separate operations. 275 */ 276 ichwd_write_tco_2(sc, TCO2_STS, TCO_SECOND_TO_STS); 277 ichwd_write_tco_2(sc, TCO2_STS, TCO_BOOT_STS); 278 } 279 280 /* 281 * Enable the watchdog timer by clearing the TCO_TMR_HALT bit in the 282 * TCO1_CNT register. This is complicated by the need to preserve bit 9 283 * of that same register, and the requirement that all other bits must be 284 * written back as zero. 285 */ 286 static __inline void 287 ichwd_tmr_enable(struct ichwd_softc *sc) 288 { 289 uint16_t cnt; 290 291 cnt = ichwd_read_tco_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE; 292 ichwd_write_tco_2(sc, TCO1_CNT, cnt & ~TCO_TMR_HALT); 293 sc->active = 1; 294 ichwd_verbose_printf(sc->device, "timer enabled\n"); 295 } 296 297 /* 298 * Disable the watchdog timer. See above for details. 299 */ 300 static __inline void 301 ichwd_tmr_disable(struct ichwd_softc *sc) 302 { 303 uint16_t cnt; 304 305 cnt = ichwd_read_tco_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE; 306 ichwd_write_tco_2(sc, TCO1_CNT, cnt | TCO_TMR_HALT); 307 sc->active = 0; 308 ichwd_verbose_printf(sc->device, "timer disabled\n"); 309 } 310 311 /* 312 * Reload the watchdog timer: writing anything to any of the lower five 313 * bits of the TCO_RLD register reloads the timer from the last value 314 * written to TCO_TMR. 315 */ 316 static __inline void 317 ichwd_tmr_reload(struct ichwd_softc *sc) 318 { 319 if (sc->ich_version <= 5) 320 ichwd_write_tco_1(sc, TCO_RLD, 1); 321 else 322 ichwd_write_tco_2(sc, TCO_RLD, 1); 323 324 ichwd_verbose_printf(sc->device, "timer reloaded\n"); 325 } 326 327 /* 328 * Set the initial timeout value. Note that this must always be followed 329 * by a reload. 330 */ 331 static __inline void 332 ichwd_tmr_set(struct ichwd_softc *sc, unsigned int timeout) 333 { 334 335 if (timeout < TCO_RLD_TMR_MIN) 336 timeout = TCO_RLD_TMR_MIN; 337 338 if (sc->ich_version <= 5) { 339 uint8_t tmr_val8 = ichwd_read_tco_1(sc, TCO_TMR1); 340 341 tmr_val8 &= (~TCO_RLD1_TMR_MAX & 0xff); 342 if (timeout > TCO_RLD1_TMR_MAX) 343 timeout = TCO_RLD1_TMR_MAX; 344 tmr_val8 |= timeout; 345 ichwd_write_tco_1(sc, TCO_TMR1, tmr_val8); 346 } else { 347 uint16_t tmr_val16 = ichwd_read_tco_2(sc, TCO_TMR2); 348 349 tmr_val16 &= (~TCO_RLD2_TMR_MAX & 0xffff); 350 if (timeout > TCO_RLD2_TMR_MAX) 351 timeout = TCO_RLD2_TMR_MAX; 352 tmr_val16 |= timeout; 353 ichwd_write_tco_2(sc, TCO_TMR2, tmr_val16); 354 } 355 356 sc->timeout = timeout; 357 358 ichwd_verbose_printf(sc->device, "timeout set to %u ticks\n", timeout); 359 } 360 361 static __inline int 362 ichwd_clear_noreboot(struct ichwd_softc *sc) 363 { 364 uint32_t status; 365 int rc = 0; 366 367 /* try to clear the NO_REBOOT bit */ 368 if (sc->ich_version <= 5) { 369 status = pci_read_config(sc->ich, ICH_GEN_STA, 1); 370 status &= ~ICH_GEN_STA_NO_REBOOT; 371 pci_write_config(sc->ich, ICH_GEN_STA, status, 1); 372 status = pci_read_config(sc->ich, ICH_GEN_STA, 1); 373 if (status & ICH_GEN_STA_NO_REBOOT) 374 rc = EIO; 375 } else { 376 status = ichwd_read_gcs_4(sc, 0); 377 status &= ~ICH_GCS_NO_REBOOT; 378 ichwd_write_gcs_4(sc, 0, status); 379 status = ichwd_read_gcs_4(sc, 0); 380 if (status & ICH_GCS_NO_REBOOT) 381 rc = EIO; 382 } 383 384 if (rc) 385 device_printf(sc->device, 386 "ICH WDT present but disabled in BIOS or hardware\n"); 387 388 return (rc); 389 } 390 391 static device_t 392 ichwd_find_ich_lpc_bridge(struct ichwd_device **id_p) 393 { 394 struct ichwd_device *id; 395 device_t ich = NULL; 396 397 /* look for an ICH LPC interface bridge */ 398 for (id = ichwd_devices; id->desc != NULL; ++id) 399 if ((ich = pci_find_device(VENDORID_INTEL, id->device)) != NULL) 400 break; 401 402 if (ich == NULL) 403 return (NULL); 404 405 ichwd_verbose_printf(ich, "found ICH%d or equivalent chipset: %s\n", 406 id->version, id->desc); 407 408 if (id_p) 409 *id_p = id; 410 411 return (ich); 412 } 413 414 /* 415 * Look for an ICH LPC interface bridge. If one is found, register an 416 * ichwd device. There can be only one. 417 */ 418 static void 419 ichwd_identify(driver_t *driver, device_t parent) 420 { 421 struct ichwd_device *id_p; 422 device_t ich = NULL; 423 device_t dev; 424 uint32_t rcba; 425 int rc; 426 427 ich = ichwd_find_ich_lpc_bridge(&id_p); 428 if (ich == NULL) 429 return; 430 431 /* good, add child to bus */ 432 if ((dev = device_find_child(parent, driver->name, 0)) == NULL) 433 dev = BUS_ADD_CHILD(parent, parent, 0, driver->name, 0); 434 435 if (dev == NULL) 436 return; 437 438 device_set_desc_copy(dev, id_p->desc); 439 440 if (id_p->version >= 6) { 441 /* get RCBA (root complex base address) */ 442 rcba = pci_read_config(ich, ICH_RCBA, 4); 443 rc = bus_set_resource(ich, SYS_RES_MEMORY, 0, 444 (rcba & 0xffffc000) + ICH_GCS_OFFSET, ICH_GCS_SIZE, -1); 445 if (rc) 446 ichwd_verbose_printf(dev, 447 "Can not set memory resource for RCBA\n"); 448 } 449 } 450 451 static int 452 ich_watchdog(void *unused, int period) 453 { 454 unsigned int timeout; 455 456 /* convert from seconds to WDT ticks */ 457 timeout = (period * 1000) / ICHWD_TICK; 458 459 ichwd_tmr_set(&ichwd_sc, timeout); 460 ichwd_tmr_reload(&ichwd_sc); 461 462 return period; 463 } 464 465 static struct watchdog ich_wdog = { 466 .name = "Intel ICH", 467 .wdog_fn = ich_watchdog, 468 .arg = NULL, 469 .period_max = (TCO_RLD1_TMR_MAX * ICHWD_TICK) / 1000, 470 }; 471 472 static int 473 ichwd_probe(device_t dev) 474 { 475 476 /* Do not claim some ISA PnP device by accident. */ 477 if (isa_get_logicalid(dev) != 0) 478 return (ENXIO); 479 return (0); 480 } 481 482 static int 483 ichwd_attach(device_t dev) 484 { 485 struct ichwd_softc *sc; 486 struct ichwd_device *id_p; 487 device_t ich; 488 unsigned int pmbase = 0; 489 490 sc = &ichwd_sc; 491 sc->device = dev; 492 493 ich = ichwd_find_ich_lpc_bridge(&id_p); 494 if (ich == NULL) { 495 device_printf(sc->device, "Can not find ICH device.\n"); 496 goto fail; 497 } 498 sc->ich = ich; 499 sc->ich_version = id_p->version; 500 501 /* get ACPI base address */ 502 pmbase = pci_read_config(ich, ICH_PMBASE, 2) & ICH_PMBASE_MASK; 503 if (pmbase == 0) { 504 device_printf(dev, "ICH PMBASE register is empty\n"); 505 goto fail; 506 } 507 508 /* allocate I/O register space */ 509 sc->smi_rid = 0; 510 sc->smi_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->smi_rid, 511 pmbase + SMI_BASE, pmbase + SMI_BASE + SMI_LEN - 1, SMI_LEN, 512 RF_ACTIVE | RF_SHAREABLE); 513 if (sc->smi_res == NULL) { 514 device_printf(dev, "unable to reserve SMI registers\n"); 515 goto fail; 516 } 517 518 sc->tco_rid = 1; 519 sc->tco_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->tco_rid, 520 pmbase + TCO_BASE, pmbase + TCO_BASE + TCO_LEN - 1, TCO_LEN, 521 RF_ACTIVE | RF_SHAREABLE); 522 if (sc->tco_res == NULL) { 523 device_printf(dev, "unable to reserve TCO registers\n"); 524 goto fail; 525 } 526 527 sc->gcs_rid = 0; 528 if (sc->ich_version >= 6) { 529 sc->gcs_res = bus_alloc_resource_any(ich, SYS_RES_MEMORY, 530 &sc->gcs_rid, RF_ACTIVE|RF_SHAREABLE); 531 if (sc->gcs_res == NULL) { 532 device_printf(dev, "unable to reserve GCS registers\n"); 533 goto fail; 534 } 535 } 536 537 if (ichwd_clear_noreboot(sc) != 0) 538 goto fail; 539 540 ichwd_verbose_printf(dev, "%s (ICH%d or equivalent)\n", 541 device_get_desc(dev), sc->ich_version); 542 543 /* 544 * Determine if we are coming up after a watchdog-induced reset. Some 545 * BIOSes may clear this bit at bootup, preventing us from reporting 546 * this case on such systems. We clear this bit in ichwd_sts_reset(). 547 */ 548 if ((ichwd_read_tco_2(sc, TCO2_STS) & TCO_SECOND_TO_STS) != 0) 549 device_printf(dev, 550 "resuming after hardware watchdog timeout\n"); 551 552 /* reset the watchdog status registers */ 553 ichwd_sts_reset(sc); 554 555 /* make sure the WDT starts out inactive */ 556 ichwd_tmr_disable(sc); 557 558 /* register the watchdog event handler */ 559 wdog_register(&ich_wdog); 560 561 /* disable the SMI handler */ 562 sc->smi_enabled = ichwd_smi_is_enabled(sc); 563 ichwd_smi_disable(sc); 564 565 /* and enable the watchdog */ 566 ichwd_tmr_enable(sc); 567 568 return (0); 569 fail: 570 sc = device_get_softc(dev); 571 if (sc->tco_res != NULL) 572 bus_release_resource(dev, SYS_RES_IOPORT, 573 sc->tco_rid, sc->tco_res); 574 if (sc->smi_res != NULL) 575 bus_release_resource(dev, SYS_RES_IOPORT, 576 sc->smi_rid, sc->smi_res); 577 if (sc->gcs_res != NULL) 578 bus_release_resource(ich, SYS_RES_MEMORY, 579 sc->gcs_rid, sc->gcs_res); 580 581 return (ENXIO); 582 } 583 584 static int 585 ichwd_detach(device_t dev) 586 { 587 struct ichwd_softc *sc; 588 device_t ich = NULL; 589 590 sc = &ichwd_sc; 591 592 /* halt the watchdog timer */ 593 if (sc->active) 594 ichwd_tmr_disable(sc); 595 596 /* enable the SMI handler */ 597 if (sc->smi_enabled != 0) 598 ichwd_smi_enable(sc); 599 600 /* deregister event handler */ 601 wdog_unregister(&ich_wdog); 602 603 /* reset the watchdog status registers */ 604 ichwd_sts_reset(sc); 605 606 /* deallocate I/O register space */ 607 bus_release_resource(dev, SYS_RES_IOPORT, sc->tco_rid, sc->tco_res); 608 bus_release_resource(dev, SYS_RES_IOPORT, sc->smi_rid, sc->smi_res); 609 610 /* deallocate memory resource */ 611 ich = ichwd_find_ich_lpc_bridge(NULL); 612 if (sc->gcs_res && ich) 613 bus_release_resource(ich, SYS_RES_MEMORY, sc->gcs_rid, sc->gcs_res); 614 615 return (0); 616 } 617 618 static device_method_t ichwd_methods[] = { 619 DEVMETHOD(device_identify, ichwd_identify), 620 DEVMETHOD(device_probe, ichwd_probe), 621 DEVMETHOD(device_attach, ichwd_attach), 622 DEVMETHOD(device_detach, ichwd_detach), 623 DEVMETHOD(device_shutdown, ichwd_detach), 624 DEVMETHOD_END 625 }; 626 627 static driver_t ichwd_driver = { 628 "ichwd", 629 ichwd_methods, 630 0 631 }; 632 633 DRIVER_MODULE(ichwd, isa, ichwd_driver, ichwd_devclass, NULL, NULL); 634 MODULE_VERSION(ichwd, 1); 635