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 58 #include <sys/cdefs.h> 59 __FBSDID("$FreeBSD$"); 60 61 #include <sys/param.h> 62 #include <sys/kernel.h> 63 #include <sys/module.h> 64 #include <sys/systm.h> 65 #include <sys/bus.h> 66 #include <machine/bus.h> 67 #include <sys/rman.h> 68 #include <machine/resource.h> 69 #include <sys/watchdog.h> 70 71 #include <isa/isavar.h> 72 #include <dev/pci/pcivar.h> 73 74 #include <dev/ichwd/ichwd.h> 75 76 static struct ichwd_device ichwd_devices[] = { 77 { DEVICEID_82801AA, "Intel 82801AA watchdog timer", 1 }, 78 { DEVICEID_82801AB, "Intel 82801AB watchdog timer", 1 }, 79 { DEVICEID_82801BA, "Intel 82801BA watchdog timer", 2 }, 80 { DEVICEID_82801BAM, "Intel 82801BAM watchdog timer", 2 }, 81 { DEVICEID_82801CA, "Intel 82801CA watchdog timer", 3 }, 82 { DEVICEID_82801CAM, "Intel 82801CAM watchdog timer", 3 }, 83 { DEVICEID_82801DB, "Intel 82801DB watchdog timer", 4 }, 84 { DEVICEID_82801DBM, "Intel 82801DBM watchdog timer", 4 }, 85 { DEVICEID_82801E, "Intel 82801E watchdog timer", 5 }, 86 { DEVICEID_82801EB, "Intel 82801EB watchdog timer", 5 }, 87 { DEVICEID_82801EBR, "Intel 82801EB/ER watchdog timer", 5 }, 88 { DEVICEID_6300ESB, "Intel 6300ESB watchdog timer", 5 }, 89 { DEVICEID_82801FBR, "Intel 82801FB/FR watchdog timer", 6 }, 90 { DEVICEID_ICH6M, "Intel ICH6M watchdog timer", 6 }, 91 { DEVICEID_ICH6W, "Intel ICH6W watchdog timer", 6 }, 92 { DEVICEID_ICH7, "Intel ICH7 watchdog timer", 7 }, 93 { DEVICEID_ICH7DH, "Intel ICH7DH watchdog timer", 7 }, 94 { DEVICEID_ICH7M, "Intel ICH7M watchdog timer", 7 }, 95 { DEVICEID_ICH7MDH, "Intel ICH7MDH watchdog timer", 7 }, 96 { DEVICEID_NM10, "Intel NM10 watchdog timer", 7 }, 97 { DEVICEID_ICH8, "Intel ICH8 watchdog timer", 8 }, 98 { DEVICEID_ICH8DH, "Intel ICH8DH watchdog timer", 8 }, 99 { DEVICEID_ICH8DO, "Intel ICH8DO watchdog timer", 8 }, 100 { DEVICEID_ICH8M, "Intel ICH8M watchdog timer", 8 }, 101 { DEVICEID_ICH8ME, "Intel ICH8M-E watchdog timer", 8 }, 102 { DEVICEID_63XXESB, "Intel 63XXESB watchdog timer", 8 }, 103 { DEVICEID_ICH9, "Intel ICH9 watchdog timer", 9 }, 104 { DEVICEID_ICH9DH, "Intel ICH9DH watchdog timer", 9 }, 105 { DEVICEID_ICH9DO, "Intel ICH9DO watchdog timer", 9 }, 106 { DEVICEID_ICH9M, "Intel ICH9M watchdog timer", 9 }, 107 { DEVICEID_ICH9ME, "Intel ICH9M-E watchdog timer", 9 }, 108 { DEVICEID_ICH9R, "Intel ICH9R watchdog timer", 9 }, 109 { DEVICEID_ICH10, "Intel ICH10 watchdog timer", 10 }, 110 { DEVICEID_ICH10D, "Intel ICH10D watchdog timer", 10 }, 111 { DEVICEID_ICH10DO, "Intel ICH10DO watchdog timer", 10 }, 112 { DEVICEID_ICH10R, "Intel ICH10R watchdog timer", 10 }, 113 { DEVICEID_PCH, "Intel PCH watchdog timer", 10 }, 114 { DEVICEID_PCHM, "Intel PCH watchdog timer", 10 }, 115 { DEVICEID_P55, "Intel P55 watchdog timer", 10 }, 116 { DEVICEID_PM55, "Intel PM55 watchdog timer", 10 }, 117 { DEVICEID_H55, "Intel H55 watchdog timer", 10 }, 118 { DEVICEID_QM57, "Intel QM57 watchdog timer", 10 }, 119 { DEVICEID_H57, "Intel H57 watchdog timer", 10 }, 120 { DEVICEID_HM55, "Intel HM55 watchdog timer", 10 }, 121 { DEVICEID_Q57, "Intel Q57 watchdog timer", 10 }, 122 { DEVICEID_HM57, "Intel HM57 watchdog timer", 10 }, 123 { DEVICEID_PCHMSFF, "Intel PCHMSFF watchdog timer", 10 }, 124 { DEVICEID_QS57, "Intel QS57 watchdog timer", 10 }, 125 { DEVICEID_3400, "Intel 3400 watchdog timer", 10 }, 126 { DEVICEID_3420, "Intel 3420 watchdog timer", 10 }, 127 { DEVICEID_3450, "Intel 3450 watchdog timer", 10 }, 128 { DEVICEID_CPT0, "Intel Cougar Point watchdog timer", 10 }, 129 { DEVICEID_CPT1, "Intel Cougar Point watchdog timer", 10 }, 130 { DEVICEID_CPT2, "Intel Cougar Point watchdog timer", 10 }, 131 { DEVICEID_CPT3, "Intel Cougar Point watchdog timer", 10 }, 132 { DEVICEID_CPT4, "Intel Cougar Point watchdog timer", 10 }, 133 { DEVICEID_CPT5, "Intel Cougar Point watchdog timer", 10 }, 134 { DEVICEID_CPT6, "Intel Cougar Point watchdog timer", 10 }, 135 { DEVICEID_CPT7, "Intel Cougar Point watchdog timer", 10 }, 136 { DEVICEID_CPT8, "Intel Cougar Point watchdog timer", 10 }, 137 { DEVICEID_CPT9, "Intel Cougar Point watchdog timer", 10 }, 138 { DEVICEID_CPT10, "Intel Cougar Point watchdog timer", 10 }, 139 { DEVICEID_CPT11, "Intel Cougar Point watchdog timer", 10 }, 140 { DEVICEID_CPT12, "Intel Cougar Point watchdog timer", 10 }, 141 { DEVICEID_CPT13, "Intel Cougar Point watchdog timer", 10 }, 142 { DEVICEID_CPT14, "Intel Cougar Point watchdog timer", 10 }, 143 { DEVICEID_CPT15, "Intel Cougar Point watchdog timer", 10 }, 144 { DEVICEID_CPT16, "Intel Cougar Point watchdog timer", 10 }, 145 { DEVICEID_CPT17, "Intel Cougar Point watchdog timer", 10 }, 146 { DEVICEID_CPT18, "Intel Cougar Point watchdog timer", 10 }, 147 { DEVICEID_CPT19, "Intel Cougar Point watchdog timer", 10 }, 148 { DEVICEID_CPT20, "Intel Cougar Point watchdog timer", 10 }, 149 { DEVICEID_CPT21, "Intel Cougar Point watchdog timer", 10 }, 150 { DEVICEID_CPT22, "Intel Cougar Point watchdog timer", 10 }, 151 { DEVICEID_CPT23, "Intel Cougar Point watchdog timer", 10 }, 152 { DEVICEID_CPT23, "Intel Cougar Point watchdog timer", 10 }, 153 { DEVICEID_CPT25, "Intel Cougar Point watchdog timer", 10 }, 154 { DEVICEID_CPT26, "Intel Cougar Point watchdog timer", 10 }, 155 { DEVICEID_CPT27, "Intel Cougar Point watchdog timer", 10 }, 156 { DEVICEID_CPT28, "Intel Cougar Point watchdog timer", 10 }, 157 { DEVICEID_CPT29, "Intel Cougar Point watchdog timer", 10 }, 158 { DEVICEID_CPT30, "Intel Cougar Point watchdog timer", 10 }, 159 { DEVICEID_CPT31, "Intel Cougar Point watchdog timer", 10 }, 160 { DEVICEID_PATSBURG_LPC1, "Intel Patsburg watchdog timer", 10 }, 161 { DEVICEID_PATSBURG_LPC2, "Intel Patsburg watchdog timer", 10 }, 162 { DEVICEID_PPT0, "Intel Panther Point watchdog timer", 10 }, 163 { DEVICEID_PPT1, "Intel Panther Point watchdog timer", 10 }, 164 { DEVICEID_PPT2, "Intel Panther Point watchdog timer", 10 }, 165 { DEVICEID_PPT3, "Intel Panther Point watchdog timer", 10 }, 166 { DEVICEID_PPT4, "Intel Panther Point watchdog timer", 10 }, 167 { DEVICEID_PPT5, "Intel Panther Point watchdog timer", 10 }, 168 { DEVICEID_PPT6, "Intel Panther Point watchdog timer", 10 }, 169 { DEVICEID_PPT7, "Intel Panther Point watchdog timer", 10 }, 170 { DEVICEID_PPT8, "Intel Panther Point watchdog timer", 10 }, 171 { DEVICEID_PPT9, "Intel Panther Point watchdog timer", 10 }, 172 { DEVICEID_PPT10, "Intel Panther Point watchdog timer", 10 }, 173 { DEVICEID_PPT11, "Intel Panther Point watchdog timer", 10 }, 174 { DEVICEID_PPT12, "Intel Panther Point watchdog timer", 10 }, 175 { DEVICEID_PPT13, "Intel Panther Point watchdog timer", 10 }, 176 { DEVICEID_PPT14, "Intel Panther Point watchdog timer", 10 }, 177 { DEVICEID_PPT15, "Intel Panther Point watchdog timer", 10 }, 178 { DEVICEID_PPT16, "Intel Panther Point watchdog timer", 10 }, 179 { DEVICEID_PPT17, "Intel Panther Point watchdog timer", 10 }, 180 { DEVICEID_PPT18, "Intel Panther Point watchdog timer", 10 }, 181 { DEVICEID_PPT19, "Intel Panther Point watchdog timer", 10 }, 182 { DEVICEID_PPT20, "Intel Panther Point watchdog timer", 10 }, 183 { DEVICEID_PPT21, "Intel Panther Point watchdog timer", 10 }, 184 { DEVICEID_PPT22, "Intel Panther Point watchdog timer", 10 }, 185 { DEVICEID_PPT23, "Intel Panther Point watchdog timer", 10 }, 186 { DEVICEID_PPT24, "Intel Panther Point watchdog timer", 10 }, 187 { DEVICEID_PPT25, "Intel Panther Point watchdog timer", 10 }, 188 { DEVICEID_PPT26, "Intel Panther Point watchdog timer", 10 }, 189 { DEVICEID_PPT27, "Intel Panther Point watchdog timer", 10 }, 190 { DEVICEID_PPT28, "Intel Panther Point watchdog timer", 10 }, 191 { DEVICEID_PPT29, "Intel Panther Point watchdog timer", 10 }, 192 { DEVICEID_PPT30, "Intel Panther Point watchdog timer", 10 }, 193 { DEVICEID_PPT31, "Intel Panther Point watchdog timer", 10 }, 194 { DEVICEID_LPT0, "Intel Lynx Point watchdog timer", 10 }, 195 { DEVICEID_LPT1, "Intel Lynx Point watchdog timer", 10 }, 196 { DEVICEID_LPT2, "Intel Lynx Point watchdog timer", 10 }, 197 { DEVICEID_WCPT2, "Intel Wildcat Point watchdog timer", 10 }, 198 { DEVICEID_WCPT4, "Intel Wildcat Point watchdog timer", 10 }, 199 { DEVICEID_WCPT6, "Intel Wildcat Point watchdog timer", 10 }, 200 { DEVICEID_DH89XXCC_LPC, "Intel DH89xxCC watchdog timer", 10 }, 201 { DEVICEID_COLETOCRK_LPC, "Intel Coleto Creek watchdog timer", 10 }, 202 { 0, NULL, 0 }, 203 }; 204 205 static devclass_t ichwd_devclass; 206 207 #define ichwd_read_tco_1(sc, off) \ 208 bus_read_1((sc)->tco_res, (off)) 209 #define ichwd_read_tco_2(sc, off) \ 210 bus_read_2((sc)->tco_res, (off)) 211 #define ichwd_read_tco_4(sc, off) \ 212 bus_read_4((sc)->tco_res, (off)) 213 #define ichwd_read_smi_4(sc, off) \ 214 bus_read_4((sc)->smi_res, (off)) 215 #define ichwd_read_gcs_4(sc, off) \ 216 bus_read_4((sc)->gcs_res, (off)) 217 218 #define ichwd_write_tco_1(sc, off, val) \ 219 bus_write_1((sc)->tco_res, (off), (val)) 220 #define ichwd_write_tco_2(sc, off, val) \ 221 bus_write_2((sc)->tco_res, (off), (val)) 222 #define ichwd_write_tco_4(sc, off, val) \ 223 bus_write_4((sc)->tco_res, (off), (val)) 224 #define ichwd_write_smi_4(sc, off, val) \ 225 bus_write_4((sc)->smi_res, (off), (val)) 226 #define ichwd_write_gcs_4(sc, off, val) \ 227 bus_write_4((sc)->gcs_res, (off), (val)) 228 229 #define ichwd_verbose_printf(dev, ...) \ 230 do { \ 231 if (bootverbose) \ 232 device_printf(dev, __VA_ARGS__);\ 233 } while (0) 234 235 /* 236 * Disable the watchdog timeout SMI handler. 237 * 238 * Apparently, some BIOSes install handlers that reset or disable the 239 * watchdog timer instead of resetting the system, so we disable the SMI 240 * (by clearing the SMI_TCO_EN bit of the SMI_EN register) to prevent this 241 * from happening. 242 */ 243 static __inline void 244 ichwd_smi_disable(struct ichwd_softc *sc) 245 { 246 ichwd_write_smi_4(sc, SMI_EN, ichwd_read_smi_4(sc, SMI_EN) & ~SMI_TCO_EN); 247 } 248 249 /* 250 * Enable the watchdog timeout SMI handler. See above for details. 251 */ 252 static __inline void 253 ichwd_smi_enable(struct ichwd_softc *sc) 254 { 255 ichwd_write_smi_4(sc, SMI_EN, ichwd_read_smi_4(sc, SMI_EN) | SMI_TCO_EN); 256 } 257 258 /* 259 * Check if the watchdog SMI triggering is enabled. 260 */ 261 static __inline int 262 ichwd_smi_is_enabled(struct ichwd_softc *sc) 263 { 264 return ((ichwd_read_smi_4(sc, SMI_EN) & SMI_TCO_EN) != 0); 265 } 266 267 /* 268 * Reset the watchdog status bits. 269 */ 270 static __inline void 271 ichwd_sts_reset(struct ichwd_softc *sc) 272 { 273 /* 274 * The watchdog status bits are set to 1 by the hardware to 275 * indicate various conditions. They can be cleared by software 276 * by writing a 1, not a 0. 277 */ 278 ichwd_write_tco_2(sc, TCO1_STS, TCO_TIMEOUT); 279 /* 280 * According to Intel's docs, clearing SECOND_TO_STS and BOOT_STS must 281 * be done in two separate operations. 282 */ 283 ichwd_write_tco_2(sc, TCO2_STS, TCO_SECOND_TO_STS); 284 ichwd_write_tco_2(sc, TCO2_STS, TCO_BOOT_STS); 285 } 286 287 /* 288 * Enable the watchdog timer by clearing the TCO_TMR_HALT bit in the 289 * TCO1_CNT register. This is complicated by the need to preserve bit 9 290 * of that same register, and the requirement that all other bits must be 291 * written back as zero. 292 */ 293 static __inline void 294 ichwd_tmr_enable(struct ichwd_softc *sc) 295 { 296 uint16_t cnt; 297 298 cnt = ichwd_read_tco_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE; 299 ichwd_write_tco_2(sc, TCO1_CNT, cnt & ~TCO_TMR_HALT); 300 sc->active = 1; 301 ichwd_verbose_printf(sc->device, "timer enabled\n"); 302 } 303 304 /* 305 * Disable the watchdog timer. See above for details. 306 */ 307 static __inline void 308 ichwd_tmr_disable(struct ichwd_softc *sc) 309 { 310 uint16_t cnt; 311 312 cnt = ichwd_read_tco_2(sc, TCO1_CNT) & TCO_CNT_PRESERVE; 313 ichwd_write_tco_2(sc, TCO1_CNT, cnt | TCO_TMR_HALT); 314 sc->active = 0; 315 ichwd_verbose_printf(sc->device, "timer disabled\n"); 316 } 317 318 /* 319 * Reload the watchdog timer: writing anything to any of the lower five 320 * bits of the TCO_RLD register reloads the timer from the last value 321 * written to TCO_TMR. 322 */ 323 static __inline void 324 ichwd_tmr_reload(struct ichwd_softc *sc) 325 { 326 if (sc->ich_version <= 5) 327 ichwd_write_tco_1(sc, TCO_RLD, 1); 328 else 329 ichwd_write_tco_2(sc, TCO_RLD, 1); 330 } 331 332 /* 333 * Set the initial timeout value. Note that this must always be followed 334 * by a reload. 335 */ 336 static __inline void 337 ichwd_tmr_set(struct ichwd_softc *sc, unsigned int timeout) 338 { 339 340 if (timeout < TCO_RLD_TMR_MIN) 341 timeout = TCO_RLD_TMR_MIN; 342 343 if (sc->ich_version <= 5) { 344 uint8_t tmr_val8 = ichwd_read_tco_1(sc, TCO_TMR1); 345 346 tmr_val8 &= (~TCO_RLD1_TMR_MAX & 0xff); 347 if (timeout > TCO_RLD1_TMR_MAX) 348 timeout = TCO_RLD1_TMR_MAX; 349 tmr_val8 |= timeout; 350 ichwd_write_tco_1(sc, TCO_TMR1, tmr_val8); 351 } else { 352 uint16_t tmr_val16 = ichwd_read_tco_2(sc, TCO_TMR2); 353 354 tmr_val16 &= (~TCO_RLD2_TMR_MAX & 0xffff); 355 if (timeout > TCO_RLD2_TMR_MAX) 356 timeout = TCO_RLD2_TMR_MAX; 357 tmr_val16 |= timeout; 358 ichwd_write_tco_2(sc, TCO_TMR2, tmr_val16); 359 } 360 361 sc->timeout = timeout; 362 363 ichwd_verbose_printf(sc->device, "timeout set to %u ticks\n", timeout); 364 } 365 366 static __inline int 367 ichwd_clear_noreboot(struct ichwd_softc *sc) 368 { 369 uint32_t status; 370 int rc = 0; 371 372 /* try to clear the NO_REBOOT bit */ 373 if (sc->ich_version <= 5) { 374 status = pci_read_config(sc->ich, ICH_GEN_STA, 1); 375 status &= ~ICH_GEN_STA_NO_REBOOT; 376 pci_write_config(sc->ich, ICH_GEN_STA, status, 1); 377 status = pci_read_config(sc->ich, ICH_GEN_STA, 1); 378 if (status & ICH_GEN_STA_NO_REBOOT) 379 rc = EIO; 380 } else { 381 status = ichwd_read_gcs_4(sc, 0); 382 status &= ~ICH_GCS_NO_REBOOT; 383 ichwd_write_gcs_4(sc, 0, status); 384 status = ichwd_read_gcs_4(sc, 0); 385 if (status & ICH_GCS_NO_REBOOT) 386 rc = EIO; 387 } 388 389 if (rc) 390 device_printf(sc->device, 391 "ICH WDT present but disabled in BIOS or hardware\n"); 392 393 return (rc); 394 } 395 396 /* 397 * Watchdog event handler - called by the framework to enable or disable 398 * the watchdog or change the initial timeout value. 399 */ 400 static void 401 ichwd_event(void *arg, unsigned int cmd, int *error) 402 { 403 struct ichwd_softc *sc = arg; 404 unsigned int timeout; 405 406 /* convert from power-of-two-ns to WDT ticks */ 407 cmd &= WD_INTERVAL; 408 timeout = ((uint64_t)1 << cmd) / ICHWD_TICK; 409 if (cmd) { 410 if (!sc->active) 411 ichwd_tmr_enable(sc); 412 if (timeout != sc->timeout) 413 ichwd_tmr_set(sc, timeout); 414 ichwd_tmr_reload(sc); 415 *error = 0; 416 } else { 417 if (sc->active) 418 ichwd_tmr_disable(sc); 419 } 420 } 421 422 static device_t 423 ichwd_find_ich_lpc_bridge(struct ichwd_device **id_p) 424 { 425 struct ichwd_device *id; 426 device_t ich = NULL; 427 428 /* look for an ICH LPC interface bridge */ 429 for (id = ichwd_devices; id->desc != NULL; ++id) 430 if ((ich = pci_find_device(VENDORID_INTEL, id->device)) != NULL) 431 break; 432 433 if (ich == NULL) 434 return (NULL); 435 436 ichwd_verbose_printf(ich, "found ICH%d or equivalent chipset: %s\n", 437 id->version, id->desc); 438 439 if (id_p) 440 *id_p = id; 441 442 return (ich); 443 } 444 445 /* 446 * Look for an ICH LPC interface bridge. If one is found, register an 447 * ichwd device. There can be only one. 448 */ 449 static void 450 ichwd_identify(driver_t *driver, device_t parent) 451 { 452 struct ichwd_device *id_p; 453 device_t ich = NULL; 454 device_t dev; 455 uint32_t rcba; 456 int rc; 457 458 ich = ichwd_find_ich_lpc_bridge(&id_p); 459 if (ich == NULL) 460 return; 461 462 /* good, add child to bus */ 463 if ((dev = device_find_child(parent, driver->name, 0)) == NULL) 464 dev = BUS_ADD_CHILD(parent, 0, driver->name, 0); 465 466 if (dev == NULL) 467 return; 468 469 device_set_desc_copy(dev, id_p->desc); 470 471 if (id_p->version >= 6) { 472 /* get RCBA (root complex base address) */ 473 rcba = pci_read_config(ich, ICH_RCBA, 4); 474 rc = bus_set_resource(ich, SYS_RES_MEMORY, 0, 475 (rcba & 0xffffc000) + ICH_GCS_OFFSET, ICH_GCS_SIZE); 476 if (rc) 477 ichwd_verbose_printf(dev, 478 "Can not set memory resource for RCBA\n"); 479 } 480 } 481 482 static int 483 ichwd_probe(device_t dev) 484 { 485 486 /* Do not claim some ISA PnP device by accident. */ 487 if (isa_get_logicalid(dev) != 0) 488 return (ENXIO); 489 return (0); 490 } 491 492 static int 493 ichwd_attach(device_t dev) 494 { 495 struct ichwd_softc *sc; 496 struct ichwd_device *id_p; 497 device_t ich; 498 unsigned int pmbase = 0; 499 500 sc = device_get_softc(dev); 501 sc->device = dev; 502 503 ich = ichwd_find_ich_lpc_bridge(&id_p); 504 if (ich == NULL) { 505 device_printf(sc->device, "Can not find ICH device.\n"); 506 goto fail; 507 } 508 sc->ich = ich; 509 sc->ich_version = id_p->version; 510 511 /* get ACPI base address */ 512 pmbase = pci_read_config(ich, ICH_PMBASE, 2) & ICH_PMBASE_MASK; 513 if (pmbase == 0) { 514 device_printf(dev, "ICH PMBASE register is empty\n"); 515 goto fail; 516 } 517 518 /* allocate I/O register space */ 519 sc->smi_rid = 0; 520 sc->smi_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->smi_rid, 521 pmbase + SMI_BASE, pmbase + SMI_BASE + SMI_LEN - 1, SMI_LEN, 522 RF_ACTIVE | RF_SHAREABLE); 523 if (sc->smi_res == NULL) { 524 device_printf(dev, "unable to reserve SMI registers\n"); 525 goto fail; 526 } 527 528 sc->tco_rid = 1; 529 sc->tco_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->tco_rid, 530 pmbase + TCO_BASE, pmbase + TCO_BASE + TCO_LEN - 1, TCO_LEN, 531 RF_ACTIVE | RF_SHAREABLE); 532 if (sc->tco_res == NULL) { 533 device_printf(dev, "unable to reserve TCO registers\n"); 534 goto fail; 535 } 536 537 sc->gcs_rid = 0; 538 if (sc->ich_version >= 6) { 539 sc->gcs_res = bus_alloc_resource_any(ich, SYS_RES_MEMORY, 540 &sc->gcs_rid, RF_ACTIVE|RF_SHAREABLE); 541 if (sc->gcs_res == NULL) { 542 device_printf(dev, "unable to reserve GCS registers\n"); 543 goto fail; 544 } 545 } 546 547 if (ichwd_clear_noreboot(sc) != 0) 548 goto fail; 549 550 ichwd_verbose_printf(dev, "%s (ICH%d or equivalent)\n", 551 device_get_desc(dev), sc->ich_version); 552 553 /* 554 * Determine if we are coming up after a watchdog-induced reset. Some 555 * BIOSes may clear this bit at bootup, preventing us from reporting 556 * this case on such systems. We clear this bit in ichwd_sts_reset(). 557 */ 558 if ((ichwd_read_tco_2(sc, TCO2_STS) & TCO_SECOND_TO_STS) != 0) 559 device_printf(dev, 560 "resuming after hardware watchdog timeout\n"); 561 562 /* reset the watchdog status registers */ 563 ichwd_sts_reset(sc); 564 565 /* make sure the WDT starts out inactive */ 566 ichwd_tmr_disable(sc); 567 568 /* register the watchdog event handler */ 569 sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, ichwd_event, sc, 0); 570 571 /* disable the SMI handler */ 572 sc->smi_enabled = ichwd_smi_is_enabled(sc); 573 ichwd_smi_disable(sc); 574 575 return (0); 576 fail: 577 sc = device_get_softc(dev); 578 if (sc->tco_res != NULL) 579 bus_release_resource(dev, SYS_RES_IOPORT, 580 sc->tco_rid, sc->tco_res); 581 if (sc->smi_res != NULL) 582 bus_release_resource(dev, SYS_RES_IOPORT, 583 sc->smi_rid, sc->smi_res); 584 if (sc->gcs_res != NULL) 585 bus_release_resource(ich, SYS_RES_MEMORY, 586 sc->gcs_rid, sc->gcs_res); 587 588 return (ENXIO); 589 } 590 591 static int 592 ichwd_detach(device_t dev) 593 { 594 struct ichwd_softc *sc; 595 device_t ich = NULL; 596 597 sc = device_get_softc(dev); 598 599 /* halt the watchdog timer */ 600 if (sc->active) 601 ichwd_tmr_disable(sc); 602 603 /* enable the SMI handler */ 604 if (sc->smi_enabled != 0) 605 ichwd_smi_enable(sc); 606 607 /* deregister event handler */ 608 if (sc->ev_tag != NULL) 609 EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag); 610 sc->ev_tag = NULL; 611 612 /* reset the watchdog status registers */ 613 ichwd_sts_reset(sc); 614 615 /* deallocate I/O register space */ 616 bus_release_resource(dev, SYS_RES_IOPORT, sc->tco_rid, sc->tco_res); 617 bus_release_resource(dev, SYS_RES_IOPORT, sc->smi_rid, sc->smi_res); 618 619 /* deallocate memory resource */ 620 ich = ichwd_find_ich_lpc_bridge(NULL); 621 if (sc->gcs_res && ich) 622 bus_release_resource(ich, SYS_RES_MEMORY, sc->gcs_rid, sc->gcs_res); 623 624 return (0); 625 } 626 627 static device_method_t ichwd_methods[] = { 628 DEVMETHOD(device_identify, ichwd_identify), 629 DEVMETHOD(device_probe, ichwd_probe), 630 DEVMETHOD(device_attach, ichwd_attach), 631 DEVMETHOD(device_detach, ichwd_detach), 632 DEVMETHOD(device_shutdown, ichwd_detach), 633 {0,0} 634 }; 635 636 static driver_t ichwd_driver = { 637 "ichwd", 638 ichwd_methods, 639 sizeof(struct ichwd_softc), 640 }; 641 642 DRIVER_MODULE(ichwd, isa, ichwd_driver, ichwd_devclass, NULL, NULL); 643