Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/amdsbwd/amdsbwd.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009 Andriy Gapon <avg@FreeBSD.org> 5 * All rights reserved. 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 * This is a driver for watchdog timer present in AMD SB600/SB7xx/SB8xx 31 * southbridges. 32 * Please see the following specifications for the descriptions of the 33 * registers and flags: 34 * - AMD SB600 Register Reference Guide, Public Version, Rev. 3.03 (SB600 RRG) 35 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/46155_sb600_rrg_pub_3.03.pdf 36 * - AMD SB700/710/750 Register Reference Guide (RRG) 37 * http://developer.amd.com/assets/43009_sb7xx_rrg_pub_1.00.pdf 38 * - AMD SB700/710/750 Register Programming Requirements (RPR) 39 * http://developer.amd.com/assets/42413_sb7xx_rpr_pub_1.00.pdf 40 * - AMD SB800-Series Southbridges Register Reference Guide (RRG) 41 * http://support.amd.com/us/Embedded_TechDocs/45482.pdf 42 * Please see the following for Watchdog Resource Table specification: 43 * - Watchdog Timer Hardware Requirements for Windows Server 2003 (WDRT) 44 * http://www.microsoft.com/whdc/system/sysinternals/watchdog.mspx 45 * AMD SB600/SB7xx/SB8xx watchdog hardware seems to conform to the above 46 * specifications, but the table hasn't been spotted in the wild yet. 47 */ 48 49 #include <sys/cdefs.h> 50 __FBSDID("$FreeBSD: releng/12.0/sys/dev/amdsbwd/amdsbwd.c 333269 2018-05-05 05:22:11Z avg $"); 51 52 #include "opt_amdsbwd.h" 53 54 #include <sys/param.h> 55 #include <sys/kernel.h> 56 #include <sys/module.h> 57 #include <sys/systm.h> 58 #include <sys/sysctl.h> 59 #include <sys/bus.h> 60 #include <machine/bus.h> 61 #include <sys/rman.h> 62 #include <machine/resource.h> 63 #include <sys/watchdog.h> 64 65 #include <dev/pci/pcivar.h> 66 #include <dev/amdsbwd/amd_chipset.h> 67 #include <isa/isavar.h> 68 69 /* 70 * Registers in the Watchdog IO space. 71 * See SB7xx RRG 2.3.4, WDRT. 72 */ 73 #define AMDSB_WD_CTRL 0x00 74 #define AMDSB_WD_RUN 0x01 75 #define AMDSB_WD_FIRED 0x02 76 #define AMDSB_WD_SHUTDOWN 0x04 77 #define AMDSB_WD_DISABLE 0x08 78 #define AMDSB_WD_RESERVED 0x70 79 #define AMDSB_WD_RELOAD 0x80 80 #define AMDSB_WD_COUNT 0x04 81 #define AMDSB_WD_COUNT_MASK 0xffff 82 #define AMDSB_WDIO_REG_WIDTH 4 83 84 #define amdsbwd_verbose_printf(dev, ...) \ 85 do { \ 86 if (bootverbose) \ 87 device_printf(dev, __VA_ARGS__);\ 88 } while (0) 89 90 struct amdsbwd_softc { 91 device_t dev; 92 eventhandler_tag ev_tag; 93 struct resource *res_ctrl; 94 struct resource *res_count; 95 int rid_ctrl; 96 int rid_count; 97 int ms_per_tick; 98 int max_ticks; 99 int active; 100 unsigned int timeout; 101 }; 102 103 static void amdsbwd_identify(driver_t *driver, device_t parent); 104 static int amdsbwd_probe(device_t dev); 105 static int amdsbwd_attach(device_t dev); 106 static int amdsbwd_detach(device_t dev); 107 static int amdsbwd_suspend(device_t dev); 108 static int amdsbwd_resume(device_t dev); 109 110 static device_method_t amdsbwd_methods[] = { 111 DEVMETHOD(device_identify, amdsbwd_identify), 112 DEVMETHOD(device_probe, amdsbwd_probe), 113 DEVMETHOD(device_attach, amdsbwd_attach), 114 DEVMETHOD(device_detach, amdsbwd_detach), 115 DEVMETHOD(device_suspend, amdsbwd_suspend), 116 DEVMETHOD(device_resume, amdsbwd_resume), 117 #if 0 118 DEVMETHOD(device_shutdown, amdsbwd_detach), 119 #endif 120 DEVMETHOD_END 121 }; 122 123 static devclass_t amdsbwd_devclass; 124 static driver_t amdsbwd_driver = { 125 "amdsbwd", 126 amdsbwd_methods, 127 sizeof(struct amdsbwd_softc) 128 }; 129 130 DRIVER_MODULE(amdsbwd, isa, amdsbwd_driver, amdsbwd_devclass, NULL, NULL); 131 132 133 static uint8_t 134 pmio_read(struct resource *res, uint8_t reg) 135 { 136 bus_write_1(res, 0, reg); /* Index */ 137 return (bus_read_1(res, 1)); /* Data */ 138 } 139 140 static void 141 pmio_write(struct resource *res, uint8_t reg, uint8_t val) 142 { 143 bus_write_1(res, 0, reg); /* Index */ 144 bus_write_1(res, 1, val); /* Data */ 145 } 146 147 static uint32_t 148 wdctrl_read(struct amdsbwd_softc *sc) 149 { 150 return (bus_read_4(sc->res_ctrl, 0)); 151 } 152 153 static void 154 wdctrl_write(struct amdsbwd_softc *sc, uint32_t val) 155 { 156 bus_write_4(sc->res_ctrl, 0, val); 157 } 158 159 static __unused uint32_t 160 wdcount_read(struct amdsbwd_softc *sc) 161 { 162 return (bus_read_4(sc->res_count, 0)); 163 } 164 165 static void 166 wdcount_write(struct amdsbwd_softc *sc, uint32_t val) 167 { 168 bus_write_4(sc->res_count, 0, val); 169 } 170 171 static void 172 amdsbwd_tmr_enable(struct amdsbwd_softc *sc) 173 { 174 uint32_t val; 175 176 val = wdctrl_read(sc); 177 val |= AMDSB_WD_RUN; 178 wdctrl_write(sc, val); 179 sc->active = 1; 180 amdsbwd_verbose_printf(sc->dev, "timer enabled\n"); 181 } 182 183 static void 184 amdsbwd_tmr_disable(struct amdsbwd_softc *sc) 185 { 186 uint32_t val; 187 188 val = wdctrl_read(sc); 189 val &= ~AMDSB_WD_RUN; 190 wdctrl_write(sc, val); 191 sc->active = 0; 192 amdsbwd_verbose_printf(sc->dev, "timer disabled\n"); 193 } 194 195 static void 196 amdsbwd_tmr_reload(struct amdsbwd_softc *sc) 197 { 198 uint32_t val; 199 200 val = wdctrl_read(sc); 201 val |= AMDSB_WD_RELOAD; 202 wdctrl_write(sc, val); 203 } 204 205 static void 206 amdsbwd_tmr_set(struct amdsbwd_softc *sc, uint16_t timeout) 207 { 208 209 timeout &= AMDSB_WD_COUNT_MASK; 210 wdcount_write(sc, timeout); 211 sc->timeout = timeout; 212 amdsbwd_verbose_printf(sc->dev, "timeout set to %u ticks\n", timeout); 213 } 214 215 static void 216 amdsbwd_event(void *arg, unsigned int cmd, int *error) 217 { 218 struct amdsbwd_softc *sc = arg; 219 uint64_t timeout; 220 221 if (cmd != 0) { 222 timeout = 0; 223 cmd &= WD_INTERVAL; 224 if (cmd >= WD_TO_1MS) { 225 timeout = (uint64_t)1 << (cmd - WD_TO_1MS); 226 timeout = timeout / sc->ms_per_tick; 227 } 228 /* For a too short timeout use 1 tick. */ 229 if (timeout == 0) 230 timeout = 1; 231 /* For a too long timeout stop the timer. */ 232 if (timeout > sc->max_ticks) 233 timeout = 0; 234 } else { 235 timeout = 0; 236 } 237 238 if (timeout != 0) { 239 if (timeout != sc->timeout) 240 amdsbwd_tmr_set(sc, timeout); 241 if (!sc->active) 242 amdsbwd_tmr_enable(sc); 243 amdsbwd_tmr_reload(sc); 244 *error = 0; 245 } else { 246 if (sc->active) 247 amdsbwd_tmr_disable(sc); 248 } 249 } 250 251 static void 252 amdsbwd_identify(driver_t *driver, device_t parent) 253 { 254 device_t child; 255 device_t smb_dev; 256 257 if (resource_disabled("amdsbwd", 0)) 258 return; 259 if (device_find_child(parent, "amdsbwd", -1) != NULL) 260 return; 261 262 /* 263 * Try to identify SB600/SB7xx by PCI Device ID of SMBus device 264 * that should be present at bus 0, device 20, function 0. 265 */ 266 smb_dev = pci_find_bsf(0, 20, 0); 267 if (smb_dev == NULL) 268 return; 269 if (pci_get_devid(smb_dev) != AMDSB_SMBUS_DEVID && 270 pci_get_devid(smb_dev) != AMDFCH_SMBUS_DEVID && 271 pci_get_devid(smb_dev) != AMDCZ_SMBUS_DEVID) 272 return; 273 274 child = BUS_ADD_CHILD(parent, ISA_ORDER_SPECULATIVE, "amdsbwd", -1); 275 if (child == NULL) 276 device_printf(parent, "add amdsbwd child failed\n"); 277 } 278 279 280 static void 281 amdsbwd_probe_sb7xx(device_t dev, struct resource *pmres, uint32_t *addr) 282 { 283 uint8_t val; 284 int i; 285 286 /* Report cause of previous reset for user's convenience. */ 287 val = pmio_read(pmres, AMDSB_PM_RESET_STATUS0); 288 if (val != 0) 289 amdsbwd_verbose_printf(dev, "ResetStatus0 = %#04x\n", val); 290 val = pmio_read(pmres, AMDSB_PM_RESET_STATUS1); 291 if (val != 0) 292 amdsbwd_verbose_printf(dev, "ResetStatus1 = %#04x\n", val); 293 if ((val & AMDSB_WD_RST_STS) != 0) 294 device_printf(dev, "Previous Reset was caused by Watchdog\n"); 295 296 /* Find base address of memory mapped WDT registers. */ 297 for (*addr = 0, i = 0; i < 4; i++) { 298 *addr <<= 8; 299 *addr |= pmio_read(pmres, AMDSB_PM_WDT_BASE_MSB - i); 300 } 301 *addr &= ~0x07u; 302 303 /* Set watchdog timer tick to 1s. */ 304 val = pmio_read(pmres, AMDSB_PM_WDT_CTRL); 305 val &= ~AMDSB_WDT_RES_MASK; 306 val |= AMDSB_WDT_RES_1S; 307 pmio_write(pmres, AMDSB_PM_WDT_CTRL, val); 308 309 /* Enable watchdog device (in stopped state). */ 310 val = pmio_read(pmres, AMDSB_PM_WDT_CTRL); 311 val &= ~AMDSB_WDT_DISABLE; 312 pmio_write(pmres, AMDSB_PM_WDT_CTRL, val); 313 314 /* 315 * XXX TODO: Ensure that watchdog decode is enabled 316 * (register 0x41, bit 3). 317 */ 318 device_set_desc(dev, "AMD SB600/SB7xx Watchdog Timer"); 319 } 320 321 static void 322 amdsbwd_probe_sb8xx(device_t dev, struct resource *pmres, uint32_t *addr) 323 { 324 uint32_t val; 325 int i; 326 327 /* Report cause of previous reset for user's convenience. */ 328 329 val = pmio_read(pmres, AMDSB8_PM_RESET_CTRL); 330 if ((val & AMDSB8_RST_STS_DIS) != 0) { 331 val &= ~AMDSB8_RST_STS_DIS; 332 pmio_write(pmres, AMDSB8_PM_RESET_CTRL, val); 333 } 334 val = 0; 335 for (i = 3; i >= 0; i--) { 336 val <<= 8; 337 val |= pmio_read(pmres, AMDSB8_PM_RESET_STATUS + i); 338 } 339 if (val != 0) 340 amdsbwd_verbose_printf(dev, "ResetStatus = 0x%08x\n", val); 341 if ((val & AMDSB8_WD_RST_STS) != 0) 342 device_printf(dev, "Previous Reset was caused by Watchdog\n"); 343 344 /* Find base address of memory mapped WDT registers. */ 345 for (*addr = 0, i = 0; i < 4; i++) { 346 *addr <<= 8; 347 *addr |= pmio_read(pmres, AMDSB8_PM_WDT_EN + 3 - i); 348 } 349 *addr &= ~0x07u; 350 351 /* Set watchdog timer tick to 1s. */ 352 val = pmio_read(pmres, AMDSB8_PM_WDT_CTRL); 353 val &= ~AMDSB8_WDT_RES_MASK; 354 val |= AMDSB8_WDT_1HZ; 355 pmio_write(pmres, AMDSB8_PM_WDT_CTRL, val); 356 #ifdef AMDSBWD_DEBUG 357 val = pmio_read(pmres, AMDSB8_PM_WDT_CTRL); 358 amdsbwd_verbose_printf(dev, "AMDSB8_PM_WDT_CTRL value = %#04x\n", val); 359 #endif 360 361 /* 362 * Enable watchdog device (in stopped state) 363 * and decoding of its address. 364 */ 365 val = pmio_read(pmres, AMDSB8_PM_WDT_EN); 366 val &= ~AMDSB8_WDT_DISABLE; 367 val |= AMDSB8_WDT_DEC_EN; 368 pmio_write(pmres, AMDSB8_PM_WDT_EN, val); 369 #ifdef AMDSBWD_DEBUG 370 val = pmio_read(pmres, AMDSB8_PM_WDT_EN); 371 device_printf(dev, "AMDSB8_PM_WDT_EN value = %#04x\n", val); 372 #endif 373 device_set_desc(dev, "AMD SB8xx/SB9xx/Axx Watchdog Timer"); 374 } 375 376 static void 377 amdsbwd_probe_fch41(device_t dev, struct resource *pmres, uint32_t *addr) 378 { 379 uint8_t val; 380 381 val = pmio_read(pmres, AMDFCH41_PM_ISA_CTRL); 382 if ((val & AMDFCH41_MMIO_EN) != 0) { 383 /* Fixed offset for the watchdog within ACPI MMIO range. */ 384 amdsbwd_verbose_printf(dev, "ACPI MMIO range is enabled\n"); 385 *addr = AMDFCH41_MMIO_ADDR + AMDFCH41_MMIO_WDT_OFF; 386 } else { 387 /* 388 * Enable decoding of watchdog MMIO address. 389 */ 390 val = pmio_read(pmres, AMDFCH41_PM_DECODE_EN0); 391 val |= AMDFCH41_WDT_EN; 392 pmio_write(pmres, AMDFCH41_PM_DECODE_EN0, val); 393 #ifdef AMDSBWD_DEBUG 394 val = pmio_read(pmres, AMDFCH41_PM_DECODE_EN0); 395 device_printf(dev, "AMDFCH41_PM_DECODE_EN0 value = %#04x\n", 396 val); 397 #endif 398 399 /* Special fixed MMIO range for the watchdog. */ 400 *addr = AMDFCH41_WDT_FIXED_ADDR; 401 } 402 403 /* 404 * Set watchdog timer tick to 1s and 405 * enable the watchdog device (in stopped state). 406 */ 407 val = pmio_read(pmres, AMDFCH41_PM_DECODE_EN3); 408 val &= ~AMDFCH41_WDT_RES_MASK; 409 val |= AMDFCH41_WDT_RES_1S; 410 val &= ~AMDFCH41_WDT_EN_MASK; 411 val |= AMDFCH41_WDT_ENABLE; 412 pmio_write(pmres, AMDFCH41_PM_DECODE_EN3, val); 413 #ifdef AMDSBWD_DEBUG 414 val = pmio_read(pmres, AMDFCH41_PM_DECODE_EN3); 415 amdsbwd_verbose_printf(dev, "AMDFCH41_PM_DECODE_EN3 value = %#04x\n", 416 val); 417 #endif 418 device_set_desc(dev, "AMD FCH Rev 41h+ Watchdog Timer"); 419 } 420 421 static int 422 amdsbwd_probe(device_t dev) 423 { 424 struct resource *res; 425 device_t smb_dev; 426 uint32_t addr; 427 int rid; 428 int rc; 429 uint32_t devid; 430 uint8_t revid; 431 432 /* Do not claim some ISA PnP device by accident. */ 433 if (isa_get_logicalid(dev) != 0) 434 return (ENXIO); 435 436 rc = bus_set_resource(dev, SYS_RES_IOPORT, 0, AMDSB_PMIO_INDEX, 437 AMDSB_PMIO_WIDTH); 438 if (rc != 0) { 439 device_printf(dev, "bus_set_resource for IO failed\n"); 440 return (ENXIO); 441 } 442 rid = 0; 443 res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, 444 RF_ACTIVE | RF_SHAREABLE); 445 if (res == NULL) { 446 device_printf(dev, "bus_alloc_resource for IO failed\n"); 447 return (ENXIO); 448 } 449 450 smb_dev = pci_find_bsf(0, 20, 0); 451 KASSERT(smb_dev != NULL, ("can't find SMBus PCI device\n")); 452 devid = pci_get_devid(smb_dev); 453 revid = pci_get_revid(smb_dev); 454 if (devid == AMDSB_SMBUS_DEVID && revid < AMDSB8_SMBUS_REVID) 455 amdsbwd_probe_sb7xx(dev, res, &addr); 456 else if (devid == AMDSB_SMBUS_DEVID || 457 (devid == AMDFCH_SMBUS_DEVID && revid < AMDFCH41_SMBUS_REVID) || 458 (devid == AMDCZ_SMBUS_DEVID && revid < AMDCZ49_SMBUS_REVID)) 459 amdsbwd_probe_sb8xx(dev, res, &addr); 460 else 461 amdsbwd_probe_fch41(dev, res, &addr); 462 463 bus_release_resource(dev, SYS_RES_IOPORT, rid, res); 464 bus_delete_resource(dev, SYS_RES_IOPORT, rid); 465 466 amdsbwd_verbose_printf(dev, "memory base address = %#010x\n", addr); 467 rc = bus_set_resource(dev, SYS_RES_MEMORY, 0, addr + AMDSB_WD_CTRL, 468 AMDSB_WDIO_REG_WIDTH); 469 if (rc != 0) { 470 device_printf(dev, "bus_set_resource for control failed\n"); 471 return (ENXIO); 472 } 473 rc = bus_set_resource(dev, SYS_RES_MEMORY, 1, addr + AMDSB_WD_COUNT, 474 AMDSB_WDIO_REG_WIDTH); 475 if (rc != 0) { 476 device_printf(dev, "bus_set_resource for count failed\n"); 477 return (ENXIO); 478 } 479 480 return (0); 481 } 482 483 static int 484 amdsbwd_attach_sb(device_t dev, struct amdsbwd_softc *sc) 485 { 486 487 sc->max_ticks = UINT16_MAX; 488 sc->rid_ctrl = 0; 489 sc->rid_count = 1; 490 491 sc->ms_per_tick = 1000; 492 493 sc->res_ctrl = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 494 &sc->rid_ctrl, RF_ACTIVE); 495 if (sc->res_ctrl == NULL) { 496 device_printf(dev, "bus_alloc_resource for ctrl failed\n"); 497 return (ENXIO); 498 } 499 sc->res_count = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 500 &sc->rid_count, RF_ACTIVE); 501 if (sc->res_count == NULL) { 502 device_printf(dev, "bus_alloc_resource for count failed\n"); 503 return (ENXIO); 504 } 505 return (0); 506 } 507 508 static int 509 amdsbwd_attach(device_t dev) 510 { 511 struct amdsbwd_softc *sc; 512 int rc; 513 514 sc = device_get_softc(dev); 515 sc->dev = dev; 516 517 rc = amdsbwd_attach_sb(dev, sc); 518 if (rc != 0) 519 goto fail; 520 521 #ifdef AMDSBWD_DEBUG 522 device_printf(dev, "wd ctrl = %#04x\n", wdctrl_read(sc)); 523 device_printf(dev, "wd count = %#04x\n", wdcount_read(sc)); 524 #endif 525 526 /* Setup initial state of Watchdog Control. */ 527 wdctrl_write(sc, AMDSB_WD_FIRED); 528 529 if (wdctrl_read(sc) & AMDSB_WD_DISABLE) { 530 device_printf(dev, "watchdog hardware is disabled\n"); 531 goto fail; 532 } 533 534 sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, amdsbwd_event, sc, 535 EVENTHANDLER_PRI_ANY); 536 537 return (0); 538 539 fail: 540 amdsbwd_detach(dev); 541 return (ENXIO); 542 } 543 544 static int 545 amdsbwd_detach(device_t dev) 546 { 547 struct amdsbwd_softc *sc; 548 549 sc = device_get_softc(dev); 550 if (sc->ev_tag != NULL) 551 EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag); 552 553 if (sc->active) 554 amdsbwd_tmr_disable(sc); 555 556 if (sc->res_ctrl != NULL) 557 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid_ctrl, 558 sc->res_ctrl); 559 560 if (sc->res_count != NULL) 561 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid_count, 562 sc->res_count); 563 564 return (0); 565 } 566 567 static int 568 amdsbwd_suspend(device_t dev) 569 { 570 struct amdsbwd_softc *sc; 571 uint32_t val; 572 573 sc = device_get_softc(dev); 574 val = wdctrl_read(sc); 575 val &= ~AMDSB_WD_RUN; 576 wdctrl_write(sc, val); 577 return (0); 578 } 579 580 static int 581 amdsbwd_resume(device_t dev) 582 { 583 struct amdsbwd_softc *sc; 584 585 sc = device_get_softc(dev); 586 wdctrl_write(sc, AMDSB_WD_FIRED); 587 if (sc->active) { 588 amdsbwd_tmr_set(sc, sc->timeout); 589 amdsbwd_tmr_enable(sc); 590 amdsbwd_tmr_reload(sc); 591 } 592 return (0); 593 }
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