1 /*- 2 * Copyright (c) 2014 Robin Randhawa 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 /* 29 * This implements support for ARM's Power State Co-ordination Interface 30 * [PSCI]. The implementation adheres to version 0.2 of the PSCI specification 31 * but also supports v0.1. PSCI standardizes operations such as system reset, CPU 32 * on/off/suspend. PSCI requires a compliant firmware implementation. 33 * 34 * The PSCI specification used for this implementation is available at: 35 * 36 * <http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0022b/index.html>. 37 * 38 * TODO: 39 * - Add support for remaining PSCI calls [this implementation only 40 * supports get_version, system_reset and cpu_on]. 41 */ 42 43 #include <sys/cdefs.h> 44 #include "opt_acpi.h" 45 #include "opt_platform.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/bus.h> 50 #include <sys/eventhandler.h> 51 #include <sys/kernel.h> 52 #include <sys/module.h> 53 #include <sys/reboot.h> 54 55 #include <machine/bus.h> 56 #include <machine/machdep.h> 57 58 #ifdef DEV_ACPI 59 #include <contrib/dev/acpica/include/acpi.h> 60 #include <dev/acpica/acpivar.h> 61 #endif 62 63 #ifdef FDT 64 #include <dev/fdt/fdt_common.h> 65 #include <dev/ofw/openfirm.h> 66 #include <dev/ofw/ofw_bus.h> 67 #include <dev/ofw/ofw_bus_subr.h> 68 #endif 69 70 #include <dev/psci/psci.h> 71 72 struct psci_softc { 73 device_t dev; 74 75 uint32_t psci_version; 76 uint32_t psci_fnids[PSCI_FN_MAX]; 77 }; 78 79 #ifdef FDT 80 static int psci_v0_1_init(device_t dev, int default_version); 81 #endif 82 static int psci_v0_2_init(device_t dev, int default_version); 83 84 struct psci_softc *psci_softc = NULL; 85 bool psci_present; 86 87 #ifdef __arm__ 88 #define USE_ACPI 0 89 #define USE_FDT 1 90 #elif defined(__aarch64__) 91 #define USE_ACPI (arm64_bus_method == ARM64_BUS_ACPI) 92 #define USE_FDT (arm64_bus_method == ARM64_BUS_FDT) 93 #else 94 #error Unknown architecture 95 #endif 96 97 #ifdef FDT 98 struct psci_init_def { 99 int default_version; 100 psci_initfn_t psci_init; 101 }; 102 103 static struct psci_init_def psci_v1_0_init_def = { 104 .default_version = (1 << 16) | 0, 105 .psci_init = psci_v0_2_init 106 }; 107 108 static struct psci_init_def psci_v0_2_init_def = { 109 .default_version = (0 << 16) | 2, 110 .psci_init = psci_v0_2_init 111 }; 112 113 static struct psci_init_def psci_v0_1_init_def = { 114 .default_version = (0 << 16) | 1, 115 .psci_init = psci_v0_1_init 116 }; 117 118 static struct ofw_compat_data compat_data[] = { 119 {"arm,psci-1.0", (uintptr_t)&psci_v1_0_init_def}, 120 {"arm,psci-0.2", (uintptr_t)&psci_v0_2_init_def}, 121 {"arm,psci", (uintptr_t)&psci_v0_1_init_def}, 122 {NULL, 0} 123 }; 124 #endif 125 126 static int psci_attach(device_t, psci_initfn_t, int); 127 128 static int psci_find_callfn(psci_callfn_t *); 129 static int psci_def_callfn(register_t, register_t, register_t, register_t, 130 register_t, register_t, register_t, register_t, 131 struct arm_smccc_res *res); 132 133 psci_callfn_t psci_callfn = psci_def_callfn; 134 135 static void 136 psci_init(void *dummy) 137 { 138 psci_callfn_t new_callfn; 139 140 if (psci_find_callfn(&new_callfn) != PSCI_RETVAL_SUCCESS) { 141 printf("No PSCI/SMCCC call function found\n"); 142 return; 143 } 144 145 psci_callfn = new_callfn; 146 psci_present = true; 147 } 148 /* This needs to be before cpu_mp at SI_SUB_CPU, SI_ORDER_THIRD */ 149 SYSINIT(psci_start, SI_SUB_CPU, SI_ORDER_FIRST, psci_init, NULL); 150 151 static int 152 psci_def_callfn(register_t a __unused, register_t b __unused, 153 register_t c __unused, register_t d __unused, 154 register_t e __unused, register_t f __unused, 155 register_t g __unused, register_t h __unused, 156 struct arm_smccc_res *res __unused) 157 { 158 159 panic("No PSCI/SMCCC call function set"); 160 } 161 162 #ifdef FDT 163 static int psci_fdt_probe(device_t dev); 164 static int psci_fdt_attach(device_t dev); 165 166 static device_method_t psci_fdt_methods[] = { 167 DEVMETHOD(device_probe, psci_fdt_probe), 168 DEVMETHOD(device_attach, psci_fdt_attach), 169 170 DEVMETHOD_END 171 }; 172 173 static driver_t psci_fdt_driver = { 174 "psci", 175 psci_fdt_methods, 176 sizeof(struct psci_softc), 177 }; 178 179 EARLY_DRIVER_MODULE(psci, simplebus, psci_fdt_driver, 0, 0, 180 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); 181 EARLY_DRIVER_MODULE(psci, ofwbus, psci_fdt_driver, 0, 0, 182 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); 183 184 static psci_callfn_t 185 psci_fdt_get_callfn(phandle_t node) 186 { 187 char method[16]; 188 189 if ((OF_getprop(node, "method", method, sizeof(method))) > 0) { 190 if (strcmp(method, "hvc") == 0) 191 return (arm_smccc_hvc); 192 else if (strcmp(method, "smc") == 0) 193 return (arm_smccc_smc); 194 else 195 printf("psci: PSCI conduit \"%s\" invalid\n", method); 196 } else 197 printf("psci: PSCI conduit not supplied in the device tree\n"); 198 199 return (NULL); 200 } 201 202 static int 203 psci_fdt_probe(device_t dev) 204 { 205 const struct ofw_compat_data *ocd; 206 207 if (!ofw_bus_status_okay(dev)) 208 return (ENXIO); 209 210 ocd = ofw_bus_search_compatible(dev, compat_data); 211 if (ocd->ocd_str == NULL) 212 return (ENXIO); 213 214 device_set_desc(dev, "ARM Power State Co-ordination Interface Driver"); 215 216 return (BUS_PROBE_SPECIFIC); 217 } 218 219 static int 220 psci_fdt_attach(device_t dev) 221 { 222 const struct ofw_compat_data *ocd; 223 struct psci_init_def *psci_init_def; 224 225 ocd = ofw_bus_search_compatible(dev, compat_data); 226 psci_init_def = (struct psci_init_def *)ocd->ocd_data; 227 228 return (psci_attach(dev, psci_init_def->psci_init, 229 psci_init_def->default_version)); 230 } 231 #endif 232 233 #ifdef DEV_ACPI 234 static void psci_acpi_identify(driver_t *, device_t); 235 static int psci_acpi_probe(device_t); 236 static int psci_acpi_attach(device_t); 237 238 static device_method_t psci_acpi_methods[] = { 239 /* Device interface */ 240 DEVMETHOD(device_identify, psci_acpi_identify), 241 DEVMETHOD(device_probe, psci_acpi_probe), 242 DEVMETHOD(device_attach, psci_acpi_attach), 243 244 DEVMETHOD_END 245 }; 246 247 static driver_t psci_acpi_driver = { 248 "psci", 249 psci_acpi_methods, 250 sizeof(struct psci_softc), 251 }; 252 253 EARLY_DRIVER_MODULE(psci, acpi, psci_acpi_driver, 0, 0, 254 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); 255 256 static int 257 psci_acpi_bootflags(void) 258 { 259 ACPI_TABLE_FADT *fadt; 260 vm_paddr_t physaddr; 261 int flags; 262 263 physaddr = acpi_find_table(ACPI_SIG_FADT); 264 if (physaddr == 0) 265 return (0); 266 267 fadt = acpi_map_table(physaddr, ACPI_SIG_FADT); 268 if (fadt == NULL) { 269 printf("psci: Unable to map the FADT\n"); 270 return (0); 271 } 272 273 flags = fadt->ArmBootFlags; 274 275 acpi_unmap_table(fadt); 276 return (flags); 277 } 278 279 static psci_callfn_t 280 psci_acpi_get_callfn(int flags) 281 { 282 283 if ((flags & ACPI_FADT_PSCI_COMPLIANT) != 0) { 284 if ((flags & ACPI_FADT_PSCI_USE_HVC) != 0) 285 return (arm_smccc_hvc); 286 else 287 return (arm_smccc_smc); 288 } else { 289 printf("psci: PSCI conduit not supplied in the device tree\n"); 290 } 291 292 return (NULL); 293 } 294 295 static void 296 psci_acpi_identify(driver_t *driver, device_t parent) 297 { 298 device_t dev; 299 int flags; 300 301 flags = psci_acpi_bootflags(); 302 if ((flags & ACPI_FADT_PSCI_COMPLIANT) != 0) { 303 dev = BUS_ADD_CHILD(parent, 304 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST, "psci", -1); 305 306 if (dev != NULL) 307 acpi_set_private(dev, (void *)(uintptr_t)flags); 308 } 309 } 310 311 static int 312 psci_acpi_probe(device_t dev) 313 { 314 uintptr_t flags; 315 316 flags = (uintptr_t)acpi_get_private(dev); 317 if ((flags & ACPI_FADT_PSCI_COMPLIANT) == 0) 318 return (ENXIO); 319 320 device_set_desc(dev, "ARM Power State Co-ordination Interface Driver"); 321 return (BUS_PROBE_SPECIFIC); 322 } 323 324 static int 325 psci_acpi_attach(device_t dev) 326 { 327 328 return (psci_attach(dev, psci_v0_2_init, PSCI_RETVAL_NOT_SUPPORTED)); 329 } 330 #endif 331 332 static int 333 psci_attach(device_t dev, psci_initfn_t psci_init, int default_version) 334 { 335 struct psci_softc *sc = device_get_softc(dev); 336 337 if (psci_softc != NULL) 338 return (ENXIO); 339 340 KASSERT(psci_init != NULL, ("PSCI init function cannot be NULL")); 341 if (psci_init(dev, default_version)) 342 return (ENXIO); 343 344 #ifdef __aarch64__ 345 smccc_init(); 346 #endif 347 348 psci_softc = sc; 349 350 return (0); 351 } 352 353 static int 354 _psci_get_version(struct psci_softc *sc) 355 { 356 uint32_t fnid; 357 358 /* PSCI version wasn't supported in v0.1. */ 359 fnid = sc->psci_fnids[PSCI_FN_VERSION]; 360 if (fnid) 361 return (psci_call(fnid, 0, 0, 0)); 362 363 return (PSCI_RETVAL_NOT_SUPPORTED); 364 } 365 366 int 367 psci_get_version(void) 368 { 369 370 if (psci_softc == NULL) 371 return (PSCI_RETVAL_NOT_SUPPORTED); 372 return (_psci_get_version(psci_softc)); 373 } 374 375 #ifdef FDT 376 static int 377 psci_fdt_callfn(psci_callfn_t *callfn) 378 { 379 phandle_t node; 380 381 /* XXX: This is suboptimal, we should walk the tree & check each 382 * node against compat_data, but we only have a few entries so 383 * it's ok for now. 384 */ 385 for (int i = 0; compat_data[i].ocd_str != NULL; i++) { 386 node = ofw_bus_find_compatible(OF_peer(0), 387 compat_data[i].ocd_str); 388 if (node != 0) 389 break; 390 } 391 if (node == 0) 392 return (PSCI_MISSING); 393 394 if (!ofw_bus_node_status_okay(node)) 395 return (PSCI_MISSING); 396 397 *callfn = psci_fdt_get_callfn(node); 398 return (0); 399 } 400 #endif 401 402 #ifdef DEV_ACPI 403 static int 404 psci_acpi_callfn(psci_callfn_t *callfn) 405 { 406 int flags; 407 408 flags = psci_acpi_bootflags(); 409 if ((flags & ACPI_FADT_PSCI_COMPLIANT) == 0) 410 return (PSCI_MISSING); 411 412 *callfn = psci_acpi_get_callfn(flags); 413 return (0); 414 } 415 #endif 416 417 static int 418 psci_find_callfn(psci_callfn_t *callfn) 419 { 420 int error; 421 422 *callfn = NULL; 423 #ifdef FDT 424 if (USE_FDT) { 425 error = psci_fdt_callfn(callfn); 426 if (error != 0) 427 return (error); 428 } 429 #endif 430 #ifdef DEV_ACPI 431 if (*callfn == NULL && USE_ACPI) { 432 error = psci_acpi_callfn(callfn); 433 if (error != 0) 434 return (error); 435 } 436 #endif 437 438 if (*callfn == NULL) 439 return (PSCI_MISSING); 440 441 return (PSCI_RETVAL_SUCCESS); 442 } 443 444 int32_t 445 psci_features(uint32_t psci_func_id) 446 { 447 448 if (psci_softc == NULL) 449 return (PSCI_RETVAL_NOT_SUPPORTED); 450 451 /* The feature flags were added to PSCI 1.0 */ 452 if (PSCI_VER_MAJOR(psci_softc->psci_version) < 1) 453 return (PSCI_RETVAL_NOT_SUPPORTED); 454 455 return (psci_call(PSCI_FNID_FEATURES, psci_func_id, 0, 0)); 456 } 457 458 int 459 psci_cpu_on(unsigned long cpu, unsigned long entry, unsigned long context_id) 460 { 461 uint32_t fnid; 462 463 fnid = PSCI_FNID_CPU_ON; 464 if (psci_softc != NULL) 465 fnid = psci_softc->psci_fnids[PSCI_FN_CPU_ON]; 466 467 /* PSCI v0.1 and v0.2 both support cpu_on. */ 468 return (psci_call(fnid, cpu, entry, context_id)); 469 } 470 471 static void 472 psci_shutdown(void *xsc, int howto) 473 { 474 uint32_t fn = 0; 475 476 if (psci_softc == NULL) 477 return; 478 479 if ((howto & RB_POWEROFF) != 0) 480 fn = psci_softc->psci_fnids[PSCI_FN_SYSTEM_OFF]; 481 if (fn) 482 psci_call(fn, 0, 0, 0); 483 484 /* System reset and off do not return. */ 485 } 486 487 static void 488 psci_reboot(void *xsc, int howto) 489 { 490 uint32_t fn = 0; 491 492 if (psci_softc == NULL) 493 return; 494 495 if ((howto & RB_HALT) == 0) 496 fn = psci_softc->psci_fnids[PSCI_FN_SYSTEM_RESET]; 497 if (fn) 498 psci_call(fn, 0, 0, 0); 499 500 /* System reset and off do not return. */ 501 } 502 503 void 504 psci_reset(void) 505 { 506 507 psci_reboot(NULL, 0); 508 } 509 510 #ifdef FDT 511 /* Only support PSCI 0.1 on FDT */ 512 static int 513 psci_v0_1_init(device_t dev, int default_version __unused) 514 { 515 struct psci_softc *sc = device_get_softc(dev); 516 int psci_fn; 517 uint32_t psci_fnid; 518 phandle_t node; 519 int len; 520 521 /* Zero out the function ID table - Is this needed ? */ 522 for (psci_fn = PSCI_FN_VERSION, psci_fnid = PSCI_FNID_VERSION; 523 psci_fn < PSCI_FN_MAX; psci_fn++, psci_fnid++) 524 sc->psci_fnids[psci_fn] = 0; 525 526 /* PSCI v0.1 doesn't specify function IDs. Get them from DT */ 527 node = ofw_bus_get_node(dev); 528 529 if ((len = OF_getproplen(node, "cpu_suspend")) > 0) { 530 OF_getencprop(node, "cpu_suspend", &psci_fnid, len); 531 sc->psci_fnids[PSCI_FN_CPU_SUSPEND] = psci_fnid; 532 } 533 534 if ((len = OF_getproplen(node, "cpu_on")) > 0) { 535 OF_getencprop(node, "cpu_on", &psci_fnid, len); 536 sc->psci_fnids[PSCI_FN_CPU_ON] = psci_fnid; 537 } 538 539 if ((len = OF_getproplen(node, "cpu_off")) > 0) { 540 OF_getencprop(node, "cpu_off", &psci_fnid, len); 541 sc->psci_fnids[PSCI_FN_CPU_OFF] = psci_fnid; 542 } 543 544 if ((len = OF_getproplen(node, "migrate")) > 0) { 545 OF_getencprop(node, "migrate", &psci_fnid, len); 546 sc->psci_fnids[PSCI_FN_MIGRATE] = psci_fnid; 547 } 548 549 sc->psci_version = (0 << 16) | 1; 550 if (bootverbose) 551 device_printf(dev, "PSCI version 0.1 available\n"); 552 553 return(0); 554 } 555 #endif 556 557 static int 558 psci_v0_2_init(device_t dev, int default_version) 559 { 560 struct psci_softc *sc = device_get_softc(dev); 561 int version; 562 563 /* PSCI v0.2 specifies explicit function IDs. */ 564 sc->psci_fnids[PSCI_FN_VERSION] = PSCI_FNID_VERSION; 565 sc->psci_fnids[PSCI_FN_CPU_SUSPEND] = PSCI_FNID_CPU_SUSPEND; 566 sc->psci_fnids[PSCI_FN_CPU_OFF] = PSCI_FNID_CPU_OFF; 567 sc->psci_fnids[PSCI_FN_CPU_ON] = PSCI_FNID_CPU_ON; 568 sc->psci_fnids[PSCI_FN_AFFINITY_INFO] = PSCI_FNID_AFFINITY_INFO; 569 sc->psci_fnids[PSCI_FN_MIGRATE] = PSCI_FNID_MIGRATE; 570 sc->psci_fnids[PSCI_FN_MIGRATE_INFO_TYPE] = PSCI_FNID_MIGRATE_INFO_TYPE; 571 sc->psci_fnids[PSCI_FN_MIGRATE_INFO_UP_CPU] = PSCI_FNID_MIGRATE_INFO_UP_CPU; 572 sc->psci_fnids[PSCI_FN_SYSTEM_OFF] = PSCI_FNID_SYSTEM_OFF; 573 sc->psci_fnids[PSCI_FN_SYSTEM_RESET] = PSCI_FNID_SYSTEM_RESET; 574 575 version = _psci_get_version(sc); 576 577 /* 578 * U-Boot PSCI implementation doesn't have psci_get_version() 579 * method implemented for many boards. In this case, use the version 580 * readed from FDT as fallback. No fallback method for ACPI. 581 */ 582 if (version == PSCI_RETVAL_NOT_SUPPORTED) { 583 if (default_version == PSCI_RETVAL_NOT_SUPPORTED) 584 return (1); 585 586 version = default_version; 587 printf("PSCI get_version() function is not implemented, " 588 " assuming v%d.%d\n", PSCI_VER_MAJOR(version), 589 PSCI_VER_MINOR(version)); 590 } 591 592 sc->psci_version = version; 593 if ((PSCI_VER_MAJOR(version) == 0 && PSCI_VER_MINOR(version) == 2) || 594 PSCI_VER_MAJOR(version) == 1) { 595 if (bootverbose) 596 device_printf(dev, "PSCI version 0.2 compatible\n"); 597 598 /* 599 * We only register this for v0.2 since v0.1 doesn't support 600 * system_reset. 601 */ 602 EVENTHANDLER_REGISTER(shutdown_final, psci_shutdown, sc, 603 SHUTDOWN_PRI_LAST); 604 605 /* Handle reboot after shutdown_panic. */ 606 EVENTHANDLER_REGISTER(shutdown_final, psci_reboot, sc, 607 SHUTDOWN_PRI_LAST + 150); 608 609 return (0); 610 } 611 612 device_printf(dev, "PSCI version number mismatched with DT\n"); 613 return (1); 614 } 615