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 __FBSDID("$FreeBSD$"); 45 46 #include "opt_acpi.h" 47 #include "opt_platform.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/bus.h> 52 #include <sys/eventhandler.h> 53 #include <sys/kernel.h> 54 #include <sys/module.h> 55 #include <sys/reboot.h> 56 57 #include <machine/bus.h> 58 #include <machine/machdep.h> 59 60 #ifdef DEV_ACPI 61 #include <contrib/dev/acpica/include/acpi.h> 62 #include <dev/acpica/acpivar.h> 63 #endif 64 65 #ifdef FDT 66 #include <dev/fdt/fdt_common.h> 67 #include <dev/ofw/openfirm.h> 68 #include <dev/ofw/ofw_bus.h> 69 #include <dev/ofw/ofw_bus_subr.h> 70 #endif 71 72 #include <dev/psci/psci.h> 73 74 struct psci_softc { 75 device_t dev; 76 77 uint32_t psci_version; 78 uint32_t psci_fnids[PSCI_FN_MAX]; 79 }; 80 81 #ifdef FDT 82 static int psci_v0_1_init(device_t dev, int default_version); 83 #endif 84 static int psci_v0_2_init(device_t dev, int default_version); 85 86 struct psci_softc *psci_softc = NULL; 87 88 #ifdef __arm__ 89 #define USE_ACPI 0 90 #define USE_FDT 1 91 #elif defined(__aarch64__) 92 #define USE_ACPI (arm64_bus_method == ARM64_BUS_ACPI) 93 #define USE_FDT (arm64_bus_method == ARM64_BUS_FDT) 94 #else 95 #error Unknown architecture 96 #endif 97 98 #ifdef FDT 99 struct psci_init_def { 100 int default_version; 101 psci_initfn_t psci_init; 102 }; 103 104 static struct psci_init_def psci_v1_0_init_def = { 105 .default_version = (1 << 16) | 0, 106 .psci_init = psci_v0_2_init 107 }; 108 109 static struct psci_init_def psci_v0_2_init_def = { 110 .default_version = (0 << 16) | 2, 111 .psci_init = psci_v0_2_init 112 }; 113 114 static struct psci_init_def psci_v0_1_init_def = { 115 .default_version = (0 << 16) | 1, 116 .psci_init = psci_v0_1_init 117 }; 118 119 static struct ofw_compat_data compat_data[] = { 120 {"arm,psci-1.0", (uintptr_t)&psci_v1_0_init_def}, 121 {"arm,psci-0.2", (uintptr_t)&psci_v0_2_init_def}, 122 {"arm,psci", (uintptr_t)&psci_v0_1_init_def}, 123 {NULL, 0} 124 }; 125 #endif 126 127 static int psci_attach(device_t, psci_initfn_t, int); 128 static void psci_shutdown(void *, int); 129 130 static int psci_find_callfn(psci_callfn_t *); 131 static int psci_def_callfn(register_t, register_t, register_t, register_t, 132 register_t, register_t, register_t, register_t, 133 struct arm_smccc_res *res); 134 135 psci_callfn_t psci_callfn = psci_def_callfn; 136 137 static void 138 psci_init(void *dummy) 139 { 140 psci_callfn_t new_callfn; 141 142 if (psci_find_callfn(&new_callfn) != PSCI_RETVAL_SUCCESS) { 143 printf("No PSCI/SMCCC call function found\n"); 144 return; 145 } 146 147 psci_callfn = new_callfn; 148 } 149 /* This needs to be before cpu_mp at SI_SUB_CPU, SI_ORDER_THIRD */ 150 SYSINIT(psci_start, SI_SUB_CPU, SI_ORDER_FIRST, psci_init, NULL); 151 152 static int 153 psci_def_callfn(register_t a __unused, register_t b __unused, 154 register_t c __unused, register_t d __unused, 155 register_t e __unused, register_t f __unused, 156 register_t g __unused, register_t h __unused, 157 struct arm_smccc_res *res __unused) 158 { 159 160 panic("No PSCI/SMCCC call function set"); 161 } 162 163 #ifdef FDT 164 static int psci_fdt_probe(device_t dev); 165 static int psci_fdt_attach(device_t dev); 166 167 static device_method_t psci_fdt_methods[] = { 168 DEVMETHOD(device_probe, psci_fdt_probe), 169 DEVMETHOD(device_attach, psci_fdt_attach), 170 171 DEVMETHOD_END 172 }; 173 174 static driver_t psci_fdt_driver = { 175 "psci", 176 psci_fdt_methods, 177 sizeof(struct psci_softc), 178 }; 179 180 static devclass_t psci_fdt_devclass; 181 182 EARLY_DRIVER_MODULE(psci, simplebus, psci_fdt_driver, psci_fdt_devclass, 0, 0, 183 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); 184 EARLY_DRIVER_MODULE(psci, ofwbus, psci_fdt_driver, psci_fdt_devclass, 0, 0, 185 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); 186 187 static psci_callfn_t 188 psci_fdt_get_callfn(phandle_t node) 189 { 190 char method[16]; 191 192 if ((OF_getprop(node, "method", method, sizeof(method))) > 0) { 193 if (strcmp(method, "hvc") == 0) 194 return (arm_smccc_hvc); 195 else if (strcmp(method, "smc") == 0) 196 return (arm_smccc_smc); 197 else 198 printf("psci: PSCI conduit \"%s\" invalid\n", method); 199 } else 200 printf("psci: PSCI conduit not supplied in the device tree\n"); 201 202 return (NULL); 203 } 204 205 static int 206 psci_fdt_probe(device_t dev) 207 { 208 const struct ofw_compat_data *ocd; 209 210 if (!ofw_bus_status_okay(dev)) 211 return (ENXIO); 212 213 ocd = ofw_bus_search_compatible(dev, compat_data); 214 if (ocd->ocd_str == NULL) 215 return (ENXIO); 216 217 device_set_desc(dev, "ARM Power State Co-ordination Interface Driver"); 218 219 return (BUS_PROBE_SPECIFIC); 220 } 221 222 static int 223 psci_fdt_attach(device_t dev) 224 { 225 const struct ofw_compat_data *ocd; 226 struct psci_init_def *psci_init_def; 227 228 ocd = ofw_bus_search_compatible(dev, compat_data); 229 psci_init_def = (struct psci_init_def *)ocd->ocd_data; 230 231 return (psci_attach(dev, psci_init_def->psci_init, 232 psci_init_def->default_version)); 233 } 234 #endif 235 236 #ifdef DEV_ACPI 237 static void psci_acpi_identify(driver_t *, device_t); 238 static int psci_acpi_probe(device_t); 239 static int psci_acpi_attach(device_t); 240 241 static device_method_t psci_acpi_methods[] = { 242 /* Device interface */ 243 DEVMETHOD(device_identify, psci_acpi_identify), 244 DEVMETHOD(device_probe, psci_acpi_probe), 245 DEVMETHOD(device_attach, psci_acpi_attach), 246 247 DEVMETHOD_END 248 }; 249 250 static driver_t psci_acpi_driver = { 251 "psci", 252 psci_acpi_methods, 253 sizeof(struct psci_softc), 254 }; 255 256 static devclass_t psci_acpi_devclass; 257 258 EARLY_DRIVER_MODULE(psci, acpi, psci_acpi_driver, psci_acpi_devclass, 0, 0, 259 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST); 260 261 static int 262 psci_acpi_bootflags(void) 263 { 264 ACPI_TABLE_FADT *fadt; 265 vm_paddr_t physaddr; 266 int flags; 267 268 physaddr = acpi_find_table(ACPI_SIG_FADT); 269 if (physaddr == 0) 270 return (0); 271 272 fadt = acpi_map_table(physaddr, ACPI_SIG_FADT); 273 if (fadt == NULL) { 274 printf("psci: Unable to map the FADT\n"); 275 return (0); 276 } 277 278 flags = fadt->ArmBootFlags; 279 280 acpi_unmap_table(fadt); 281 return (flags); 282 } 283 284 static psci_callfn_t 285 psci_acpi_get_callfn(int flags) 286 { 287 288 if ((flags & ACPI_FADT_PSCI_COMPLIANT) != 0) { 289 if ((flags & ACPI_FADT_PSCI_USE_HVC) != 0) 290 return (arm_smccc_hvc); 291 else 292 return (arm_smccc_smc); 293 } else { 294 printf("psci: PSCI conduit not supplied in the device tree\n"); 295 } 296 297 return (NULL); 298 } 299 300 static void 301 psci_acpi_identify(driver_t *driver, device_t parent) 302 { 303 device_t dev; 304 int flags; 305 306 flags = psci_acpi_bootflags(); 307 if ((flags & ACPI_FADT_PSCI_COMPLIANT) != 0) { 308 dev = BUS_ADD_CHILD(parent, 309 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST, "psci", -1); 310 311 if (dev != NULL) 312 acpi_set_private(dev, (void *)(uintptr_t)flags); 313 } 314 } 315 316 static int 317 psci_acpi_probe(device_t dev) 318 { 319 uintptr_t flags; 320 321 flags = (uintptr_t)acpi_get_private(dev); 322 if ((flags & ACPI_FADT_PSCI_COMPLIANT) == 0) 323 return (ENXIO); 324 325 device_set_desc(dev, "ARM Power State Co-ordination Interface Driver"); 326 return (BUS_PROBE_SPECIFIC); 327 } 328 329 static int 330 psci_acpi_attach(device_t dev) 331 { 332 333 return (psci_attach(dev, psci_v0_2_init, PSCI_RETVAL_NOT_SUPPORTED)); 334 } 335 #endif 336 337 static int 338 psci_attach(device_t dev, psci_initfn_t psci_init, int default_version) 339 { 340 struct psci_softc *sc = device_get_softc(dev); 341 342 if (psci_softc != NULL) 343 return (ENXIO); 344 345 KASSERT(psci_init != NULL, ("PSCI init function cannot be NULL")); 346 if (psci_init(dev, default_version)) 347 return (ENXIO); 348 349 psci_softc = sc; 350 351 return (0); 352 } 353 354 static int 355 _psci_get_version(struct psci_softc *sc) 356 { 357 uint32_t fnid; 358 359 /* PSCI version wasn't supported in v0.1. */ 360 fnid = sc->psci_fnids[PSCI_FN_VERSION]; 361 if (fnid) 362 return (psci_call(fnid, 0, 0, 0)); 363 364 return (PSCI_RETVAL_NOT_SUPPORTED); 365 } 366 367 int 368 psci_get_version(void) 369 { 370 371 if (psci_softc == NULL) 372 return (PSCI_RETVAL_NOT_SUPPORTED); 373 return (_psci_get_version(psci_softc)); 374 } 375 376 #ifdef FDT 377 static int 378 psci_fdt_callfn(psci_callfn_t *callfn) 379 { 380 phandle_t node; 381 382 node = ofw_bus_find_compatible(OF_peer(0), "arm,psci-0.2"); 383 if (node == 0) { 384 node = ofw_bus_find_compatible(OF_peer(0), "arm,psci-1.0"); 385 if (node == 0) 386 return (PSCI_MISSING); 387 } 388 389 *callfn = psci_fdt_get_callfn(node); 390 return (0); 391 } 392 #endif 393 394 #ifdef DEV_ACPI 395 static int 396 psci_acpi_callfn(psci_callfn_t *callfn) 397 { 398 int flags; 399 400 flags = psci_acpi_bootflags(); 401 if ((flags & ACPI_FADT_PSCI_COMPLIANT) == 0) 402 return (PSCI_MISSING); 403 404 *callfn = psci_acpi_get_callfn(flags); 405 return (0); 406 } 407 #endif 408 409 static int 410 psci_find_callfn(psci_callfn_t *callfn) 411 { 412 int error; 413 414 *callfn = NULL; 415 #ifdef FDT 416 if (USE_FDT) { 417 error = psci_fdt_callfn(callfn); 418 if (error != 0) 419 return (error); 420 } 421 #endif 422 #ifdef DEV_ACPI 423 if (*callfn == NULL && USE_ACPI) { 424 error = psci_acpi_callfn(callfn); 425 if (error != 0) 426 return (error); 427 } 428 #endif 429 430 if (*callfn == NULL) 431 return (PSCI_MISSING); 432 433 return (PSCI_RETVAL_SUCCESS); 434 } 435 436 int32_t 437 psci_features(uint32_t psci_func_id) 438 { 439 440 if (psci_softc == NULL) 441 return (PSCI_RETVAL_NOT_SUPPORTED); 442 443 /* The feature flags were added to PSCI 1.0 */ 444 if (PSCI_VER_MAJOR(psci_softc->psci_version) < 1) 445 return (PSCI_RETVAL_NOT_SUPPORTED); 446 447 return (psci_call(PSCI_FNID_FEATURES, psci_func_id, 0, 0)); 448 } 449 450 int 451 psci_cpu_on(unsigned long cpu, unsigned long entry, unsigned long context_id) 452 { 453 uint32_t fnid; 454 455 fnid = PSCI_FNID_CPU_ON; 456 if (psci_softc != NULL) 457 fnid = psci_softc->psci_fnids[PSCI_FN_CPU_ON]; 458 459 /* PSCI v0.1 and v0.2 both support cpu_on. */ 460 return (psci_call(fnid, cpu, entry, context_id)); 461 } 462 463 static void 464 psci_shutdown(void *xsc, int howto) 465 { 466 uint32_t fn = 0; 467 468 if (psci_softc == NULL) 469 return; 470 471 /* PSCI system_off and system_reset werent't supported in v0.1. */ 472 if ((howto & RB_POWEROFF) != 0) 473 fn = psci_softc->psci_fnids[PSCI_FN_SYSTEM_OFF]; 474 else if ((howto & RB_HALT) == 0) 475 fn = psci_softc->psci_fnids[PSCI_FN_SYSTEM_RESET]; 476 477 if (fn) 478 psci_call(fn, 0, 0, 0); 479 480 /* System reset and off do not return. */ 481 } 482 483 void 484 psci_reset(void) 485 { 486 487 psci_shutdown(NULL, 0); 488 } 489 490 #ifdef FDT 491 /* Only support PSCI 0.1 on FDT */ 492 static int 493 psci_v0_1_init(device_t dev, int default_version __unused) 494 { 495 struct psci_softc *sc = device_get_softc(dev); 496 int psci_fn; 497 uint32_t psci_fnid; 498 phandle_t node; 499 int len; 500 501 502 /* Zero out the function ID table - Is this needed ? */ 503 for (psci_fn = PSCI_FN_VERSION, psci_fnid = PSCI_FNID_VERSION; 504 psci_fn < PSCI_FN_MAX; psci_fn++, psci_fnid++) 505 sc->psci_fnids[psci_fn] = 0; 506 507 /* PSCI v0.1 doesn't specify function IDs. Get them from DT */ 508 node = ofw_bus_get_node(dev); 509 510 if ((len = OF_getproplen(node, "cpu_suspend")) > 0) { 511 OF_getencprop(node, "cpu_suspend", &psci_fnid, len); 512 sc->psci_fnids[PSCI_FN_CPU_SUSPEND] = psci_fnid; 513 } 514 515 if ((len = OF_getproplen(node, "cpu_on")) > 0) { 516 OF_getencprop(node, "cpu_on", &psci_fnid, len); 517 sc->psci_fnids[PSCI_FN_CPU_ON] = psci_fnid; 518 } 519 520 if ((len = OF_getproplen(node, "cpu_off")) > 0) { 521 OF_getencprop(node, "cpu_off", &psci_fnid, len); 522 sc->psci_fnids[PSCI_FN_CPU_OFF] = psci_fnid; 523 } 524 525 if ((len = OF_getproplen(node, "migrate")) > 0) { 526 OF_getencprop(node, "migrate", &psci_fnid, len); 527 sc->psci_fnids[PSCI_FN_MIGRATE] = psci_fnid; 528 } 529 530 sc->psci_version = (0 << 16) | 1; 531 if (bootverbose) 532 device_printf(dev, "PSCI version 0.1 available\n"); 533 534 return(0); 535 } 536 #endif 537 538 static int 539 psci_v0_2_init(device_t dev, int default_version) 540 { 541 struct psci_softc *sc = device_get_softc(dev); 542 int version; 543 544 /* PSCI v0.2 specifies explicit function IDs. */ 545 sc->psci_fnids[PSCI_FN_VERSION] = PSCI_FNID_VERSION; 546 sc->psci_fnids[PSCI_FN_CPU_SUSPEND] = PSCI_FNID_CPU_SUSPEND; 547 sc->psci_fnids[PSCI_FN_CPU_OFF] = PSCI_FNID_CPU_OFF; 548 sc->psci_fnids[PSCI_FN_CPU_ON] = PSCI_FNID_CPU_ON; 549 sc->psci_fnids[PSCI_FN_AFFINITY_INFO] = PSCI_FNID_AFFINITY_INFO; 550 sc->psci_fnids[PSCI_FN_MIGRATE] = PSCI_FNID_MIGRATE; 551 sc->psci_fnids[PSCI_FN_MIGRATE_INFO_TYPE] = PSCI_FNID_MIGRATE_INFO_TYPE; 552 sc->psci_fnids[PSCI_FN_MIGRATE_INFO_UP_CPU] = PSCI_FNID_MIGRATE_INFO_UP_CPU; 553 sc->psci_fnids[PSCI_FN_SYSTEM_OFF] = PSCI_FNID_SYSTEM_OFF; 554 sc->psci_fnids[PSCI_FN_SYSTEM_RESET] = PSCI_FNID_SYSTEM_RESET; 555 556 version = _psci_get_version(sc); 557 558 /* 559 * U-Boot PSCI implementation doesn't have psci_get_version() 560 * method implemented for many boards. In this case, use the version 561 * readed from FDT as fallback. No fallback method for ACPI. 562 */ 563 if (version == PSCI_RETVAL_NOT_SUPPORTED) { 564 if (default_version == PSCI_RETVAL_NOT_SUPPORTED) 565 return (1); 566 567 version = default_version; 568 printf("PSCI get_version() function is not implemented, " 569 " assuming v%d.%d\n", PSCI_VER_MAJOR(version), 570 PSCI_VER_MINOR(version)); 571 } 572 573 sc->psci_version = version; 574 if ((PSCI_VER_MAJOR(version) == 0 && PSCI_VER_MINOR(version) == 2) || 575 PSCI_VER_MAJOR(version) == 1) { 576 if (bootverbose) 577 device_printf(dev, "PSCI version 0.2 compatible\n"); 578 579 /* 580 * We only register this for v0.2 since v0.1 doesn't support 581 * system_reset. 582 */ 583 EVENTHANDLER_REGISTER(shutdown_final, psci_shutdown, sc, 584 SHUTDOWN_PRI_LAST); 585 586 return (0); 587 } 588 589 device_printf(dev, "PSCI version number mismatched with DT\n"); 590 return (1); 591 } 592