1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Based on acpi.c from coreboot 4 * 5 * Copyright (C) 2015, Saket Sinha <saket.sinha89@gmail.com> 6 * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com> 7 */ 8 9 #include <common.h> 10 #include <cpu.h> 11 #include <dm.h> 12 #include <dm/uclass-internal.h> 13 #include <version.h> 14 #include <asm/acpi/global_nvs.h> 15 #include <asm/acpi_table.h> 16 #include <asm/io.h> 17 #include <asm/ioapic.h> 18 #include <asm/lapic.h> 19 #include <asm/mpspec.h> 20 #include <asm/tables.h> 21 #include <asm/arch/global_nvs.h> 22 23 /* 24 * IASL compiles the dsdt entries and writes the hex values 25 * to a C array AmlCode[] (see dsdt.c). 26 */ 27 extern const unsigned char AmlCode[]; 28 29 /* ACPI RSDP address to be used in boot parameters */ 30 static ulong acpi_rsdp_addr; 31 32 static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt, 33 struct acpi_xsdt *xsdt) 34 { 35 memset(rsdp, 0, sizeof(struct acpi_rsdp)); 36 37 memcpy(rsdp->signature, RSDP_SIG, 8); 38 memcpy(rsdp->oem_id, OEM_ID, 6); 39 40 rsdp->length = sizeof(struct acpi_rsdp); 41 rsdp->rsdt_address = (u32)rsdt; 42 43 /* 44 * Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2 45 * 46 * Some OSes expect an XSDT to be present for RSD PTR revisions >= 2. 47 * If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR 48 * revision 0) 49 */ 50 if (xsdt == NULL) { 51 rsdp->revision = ACPI_RSDP_REV_ACPI_1_0; 52 } else { 53 rsdp->xsdt_address = (u64)(u32)xsdt; 54 rsdp->revision = ACPI_RSDP_REV_ACPI_2_0; 55 } 56 57 /* Calculate checksums */ 58 rsdp->checksum = table_compute_checksum((void *)rsdp, 20); 59 rsdp->ext_checksum = table_compute_checksum((void *)rsdp, 60 sizeof(struct acpi_rsdp)); 61 } 62 63 void acpi_fill_header(struct acpi_table_header *header, char *signature) 64 { 65 memcpy(header->signature, signature, 4); 66 memcpy(header->oem_id, OEM_ID, 6); 67 memcpy(header->oem_table_id, OEM_TABLE_ID, 8); 68 header->oem_revision = U_BOOT_BUILD_DATE; 69 memcpy(header->aslc_id, ASLC_ID, 4); 70 } 71 72 static void acpi_write_rsdt(struct acpi_rsdt *rsdt) 73 { 74 struct acpi_table_header *header = &(rsdt->header); 75 76 /* Fill out header fields */ 77 acpi_fill_header(header, "RSDT"); 78 header->length = sizeof(struct acpi_rsdt); 79 header->revision = 1; 80 81 /* Entries are filled in later, we come with an empty set */ 82 83 /* Fix checksum */ 84 header->checksum = table_compute_checksum((void *)rsdt, 85 sizeof(struct acpi_rsdt)); 86 } 87 88 static void acpi_write_xsdt(struct acpi_xsdt *xsdt) 89 { 90 struct acpi_table_header *header = &(xsdt->header); 91 92 /* Fill out header fields */ 93 acpi_fill_header(header, "XSDT"); 94 header->length = sizeof(struct acpi_xsdt); 95 header->revision = 1; 96 97 /* Entries are filled in later, we come with an empty set */ 98 99 /* Fix checksum */ 100 header->checksum = table_compute_checksum((void *)xsdt, 101 sizeof(struct acpi_xsdt)); 102 } 103 104 /** 105 * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length 106 * and checksum. 107 */ 108 static void acpi_add_table(struct acpi_rsdp *rsdp, void *table) 109 { 110 int i, entries_num; 111 struct acpi_rsdt *rsdt; 112 struct acpi_xsdt *xsdt = NULL; 113 114 /* The RSDT is mandatory while the XSDT is not */ 115 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address; 116 117 if (rsdp->xsdt_address) 118 xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address); 119 120 /* This should always be MAX_ACPI_TABLES */ 121 entries_num = ARRAY_SIZE(rsdt->entry); 122 123 for (i = 0; i < entries_num; i++) { 124 if (rsdt->entry[i] == 0) 125 break; 126 } 127 128 if (i >= entries_num) { 129 debug("ACPI: Error: too many tables\n"); 130 return; 131 } 132 133 /* Add table to the RSDT */ 134 rsdt->entry[i] = (u32)table; 135 136 /* Fix RSDT length or the kernel will assume invalid entries */ 137 rsdt->header.length = sizeof(struct acpi_table_header) + 138 (sizeof(u32) * (i + 1)); 139 140 /* Re-calculate checksum */ 141 rsdt->header.checksum = 0; 142 rsdt->header.checksum = table_compute_checksum((u8 *)rsdt, 143 rsdt->header.length); 144 145 /* 146 * And now the same thing for the XSDT. We use the same index as for 147 * now we want the XSDT and RSDT to always be in sync in U-Boot 148 */ 149 if (xsdt) { 150 /* Add table to the XSDT */ 151 xsdt->entry[i] = (u64)(u32)table; 152 153 /* Fix XSDT length */ 154 xsdt->header.length = sizeof(struct acpi_table_header) + 155 (sizeof(u64) * (i + 1)); 156 157 /* Re-calculate checksum */ 158 xsdt->header.checksum = 0; 159 xsdt->header.checksum = table_compute_checksum((u8 *)xsdt, 160 xsdt->header.length); 161 } 162 } 163 164 static void acpi_create_facs(struct acpi_facs *facs) 165 { 166 memset((void *)facs, 0, sizeof(struct acpi_facs)); 167 168 memcpy(facs->signature, "FACS", 4); 169 facs->length = sizeof(struct acpi_facs); 170 facs->hardware_signature = 0; 171 facs->firmware_waking_vector = 0; 172 facs->global_lock = 0; 173 facs->flags = 0; 174 facs->x_firmware_waking_vector_l = 0; 175 facs->x_firmware_waking_vector_h = 0; 176 facs->version = 1; 177 } 178 179 static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic, 180 u8 cpu, u8 apic) 181 { 182 lapic->type = ACPI_APIC_LAPIC; 183 lapic->length = sizeof(struct acpi_madt_lapic); 184 lapic->flags = LOCAL_APIC_FLAG_ENABLED; 185 lapic->processor_id = cpu; 186 lapic->apic_id = apic; 187 188 return lapic->length; 189 } 190 191 int acpi_create_madt_lapics(u32 current) 192 { 193 struct udevice *dev; 194 int total_length = 0; 195 196 for (uclass_find_first_device(UCLASS_CPU, &dev); 197 dev; 198 uclass_find_next_device(&dev)) { 199 struct cpu_platdata *plat = dev_get_parent_platdata(dev); 200 int length = acpi_create_madt_lapic( 201 (struct acpi_madt_lapic *)current, 202 plat->cpu_id, plat->cpu_id); 203 current += length; 204 total_length += length; 205 } 206 207 return total_length; 208 } 209 210 int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id, 211 u32 addr, u32 gsi_base) 212 { 213 ioapic->type = ACPI_APIC_IOAPIC; 214 ioapic->length = sizeof(struct acpi_madt_ioapic); 215 ioapic->reserved = 0x00; 216 ioapic->gsi_base = gsi_base; 217 ioapic->ioapic_id = id; 218 ioapic->ioapic_addr = addr; 219 220 return ioapic->length; 221 } 222 223 int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride, 224 u8 bus, u8 source, u32 gsirq, u16 flags) 225 { 226 irqoverride->type = ACPI_APIC_IRQ_SRC_OVERRIDE; 227 irqoverride->length = sizeof(struct acpi_madt_irqoverride); 228 irqoverride->bus = bus; 229 irqoverride->source = source; 230 irqoverride->gsirq = gsirq; 231 irqoverride->flags = flags; 232 233 return irqoverride->length; 234 } 235 236 int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi, 237 u8 cpu, u16 flags, u8 lint) 238 { 239 lapic_nmi->type = ACPI_APIC_LAPIC_NMI; 240 lapic_nmi->length = sizeof(struct acpi_madt_lapic_nmi); 241 lapic_nmi->flags = flags; 242 lapic_nmi->processor_id = cpu; 243 lapic_nmi->lint = lint; 244 245 return lapic_nmi->length; 246 } 247 248 static int acpi_create_madt_irq_overrides(u32 current) 249 { 250 struct acpi_madt_irqoverride *irqovr; 251 u16 sci_flags = MP_IRQ_TRIGGER_LEVEL | MP_IRQ_POLARITY_HIGH; 252 int length = 0; 253 254 irqovr = (void *)current; 255 length += acpi_create_madt_irqoverride(irqovr, 0, 0, 2, 0); 256 257 irqovr = (void *)(current + length); 258 length += acpi_create_madt_irqoverride(irqovr, 0, 9, 9, sci_flags); 259 260 return length; 261 } 262 263 __weak u32 acpi_fill_madt(u32 current) 264 { 265 current += acpi_create_madt_lapics(current); 266 267 current += acpi_create_madt_ioapic((struct acpi_madt_ioapic *)current, 268 io_apic_read(IO_APIC_ID) >> 24, IO_APIC_ADDR, 0); 269 270 current += acpi_create_madt_irq_overrides(current); 271 272 return current; 273 } 274 275 static void acpi_create_madt(struct acpi_madt *madt) 276 { 277 struct acpi_table_header *header = &(madt->header); 278 u32 current = (u32)madt + sizeof(struct acpi_madt); 279 280 memset((void *)madt, 0, sizeof(struct acpi_madt)); 281 282 /* Fill out header fields */ 283 acpi_fill_header(header, "APIC"); 284 header->length = sizeof(struct acpi_madt); 285 header->revision = 4; 286 287 madt->lapic_addr = LAPIC_DEFAULT_BASE; 288 madt->flags = ACPI_MADT_PCAT_COMPAT; 289 290 current = acpi_fill_madt(current); 291 292 /* (Re)calculate length and checksum */ 293 header->length = current - (u32)madt; 294 295 header->checksum = table_compute_checksum((void *)madt, header->length); 296 } 297 298 int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base, 299 u16 seg_nr, u8 start, u8 end) 300 { 301 memset(mmconfig, 0, sizeof(*mmconfig)); 302 mmconfig->base_address_l = base; 303 mmconfig->base_address_h = 0; 304 mmconfig->pci_segment_group_number = seg_nr; 305 mmconfig->start_bus_number = start; 306 mmconfig->end_bus_number = end; 307 308 return sizeof(struct acpi_mcfg_mmconfig); 309 } 310 311 __weak u32 acpi_fill_mcfg(u32 current) 312 { 313 current += acpi_create_mcfg_mmconfig 314 ((struct acpi_mcfg_mmconfig *)current, 315 CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255); 316 317 return current; 318 } 319 320 /* MCFG is defined in the PCI Firmware Specification 3.0 */ 321 static void acpi_create_mcfg(struct acpi_mcfg *mcfg) 322 { 323 struct acpi_table_header *header = &(mcfg->header); 324 u32 current = (u32)mcfg + sizeof(struct acpi_mcfg); 325 326 memset((void *)mcfg, 0, sizeof(struct acpi_mcfg)); 327 328 /* Fill out header fields */ 329 acpi_fill_header(header, "MCFG"); 330 header->length = sizeof(struct acpi_mcfg); 331 header->revision = 1; 332 333 current = acpi_fill_mcfg(current); 334 335 /* (Re)calculate length and checksum */ 336 header->length = current - (u32)mcfg; 337 header->checksum = table_compute_checksum((void *)mcfg, header->length); 338 } 339 340 void enter_acpi_mode(int pm1_cnt) 341 { 342 u16 val = inw(pm1_cnt); 343 344 /* 345 * PM1_CNT register bit0 selects the power management event to be 346 * either an SCI or SMI interrupt. When this bit is set, then power 347 * management events will generate an SCI interrupt. When this bit 348 * is reset power management events will generate an SMI interrupt. 349 * 350 * Per ACPI spec, it is the responsibility of the hardware to set 351 * or reset this bit. OSPM always preserves this bit position. 352 * 353 * U-Boot does not support SMI. And we don't have plan to support 354 * anything running in SMM within U-Boot. To create a legacy-free 355 * system, and expose ourselves to OSPM as working under ACPI mode 356 * already, turn this bit on. 357 */ 358 outw(val | PM1_CNT_SCI_EN, pm1_cnt); 359 } 360 361 /* 362 * QEMU's version of write_acpi_tables is defined in drivers/misc/qfw.c 363 */ 364 ulong write_acpi_tables(ulong start) 365 { 366 u32 current; 367 struct acpi_rsdp *rsdp; 368 struct acpi_rsdt *rsdt; 369 struct acpi_xsdt *xsdt; 370 struct acpi_facs *facs; 371 struct acpi_table_header *dsdt; 372 struct acpi_fadt *fadt; 373 struct acpi_mcfg *mcfg; 374 struct acpi_madt *madt; 375 int i; 376 377 current = start; 378 379 /* Align ACPI tables to 16 byte */ 380 current = ALIGN(current, 16); 381 382 debug("ACPI: Writing ACPI tables at %lx\n", start); 383 384 /* We need at least an RSDP and an RSDT Table */ 385 rsdp = (struct acpi_rsdp *)current; 386 current += sizeof(struct acpi_rsdp); 387 current = ALIGN(current, 16); 388 rsdt = (struct acpi_rsdt *)current; 389 current += sizeof(struct acpi_rsdt); 390 current = ALIGN(current, 16); 391 xsdt = (struct acpi_xsdt *)current; 392 current += sizeof(struct acpi_xsdt); 393 /* 394 * Per ACPI spec, the FACS table address must be aligned to a 64 byte 395 * boundary (Windows checks this, but Linux does not). 396 */ 397 current = ALIGN(current, 64); 398 399 /* clear all table memory */ 400 memset((void *)start, 0, current - start); 401 402 acpi_write_rsdp(rsdp, rsdt, xsdt); 403 acpi_write_rsdt(rsdt); 404 acpi_write_xsdt(xsdt); 405 406 debug("ACPI: * FACS\n"); 407 facs = (struct acpi_facs *)current; 408 current += sizeof(struct acpi_facs); 409 current = ALIGN(current, 16); 410 411 acpi_create_facs(facs); 412 413 debug("ACPI: * DSDT\n"); 414 dsdt = (struct acpi_table_header *)current; 415 memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header)); 416 current += sizeof(struct acpi_table_header); 417 memcpy((char *)current, 418 (char *)&AmlCode + sizeof(struct acpi_table_header), 419 dsdt->length - sizeof(struct acpi_table_header)); 420 current += dsdt->length - sizeof(struct acpi_table_header); 421 current = ALIGN(current, 16); 422 423 /* Pack GNVS into the ACPI table area */ 424 for (i = 0; i < dsdt->length; i++) { 425 u32 *gnvs = (u32 *)((u32)dsdt + i); 426 if (*gnvs == ACPI_GNVS_ADDR) { 427 debug("Fix up global NVS in DSDT to 0x%08x\n", current); 428 *gnvs = current; 429 break; 430 } 431 } 432 433 /* Update DSDT checksum since we patched the GNVS address */ 434 dsdt->checksum = 0; 435 dsdt->checksum = table_compute_checksum((void *)dsdt, dsdt->length); 436 437 /* Fill in platform-specific global NVS variables */ 438 acpi_create_gnvs((struct acpi_global_nvs *)current); 439 current += sizeof(struct acpi_global_nvs); 440 current = ALIGN(current, 16); 441 442 debug("ACPI: * FADT\n"); 443 fadt = (struct acpi_fadt *)current; 444 current += sizeof(struct acpi_fadt); 445 current = ALIGN(current, 16); 446 acpi_create_fadt(fadt, facs, dsdt); 447 acpi_add_table(rsdp, fadt); 448 449 debug("ACPI: * MADT\n"); 450 madt = (struct acpi_madt *)current; 451 acpi_create_madt(madt); 452 current += madt->header.length; 453 acpi_add_table(rsdp, madt); 454 current = ALIGN(current, 16); 455 456 debug("ACPI: * MCFG\n"); 457 mcfg = (struct acpi_mcfg *)current; 458 acpi_create_mcfg(mcfg); 459 current += mcfg->header.length; 460 acpi_add_table(rsdp, mcfg); 461 current = ALIGN(current, 16); 462 463 debug("current = %x\n", current); 464 465 acpi_rsdp_addr = (unsigned long)rsdp; 466 debug("ACPI: done\n"); 467 468 /* Don't touch ACPI hardware on HW reduced platforms */ 469 if (fadt->flags & ACPI_FADT_HW_REDUCED_ACPI) 470 return current; 471 472 /* 473 * Other than waiting for OSPM to request us to switch to ACPI mode, 474 * do it by ourselves, since SMI will not be triggered. 475 */ 476 enter_acpi_mode(fadt->pm1a_cnt_blk); 477 478 return current; 479 } 480 481 ulong acpi_get_rsdp_addr(void) 482 { 483 return acpi_rsdp_addr; 484 } 485 486 static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp) 487 { 488 if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0) 489 return NULL; 490 491 debug("Looking on %p for valid checksum\n", rsdp); 492 493 if (table_compute_checksum((void *)rsdp, 20) != 0) 494 return NULL; 495 debug("acpi rsdp checksum 1 passed\n"); 496 497 if ((rsdp->revision > 1) && 498 (table_compute_checksum((void *)rsdp, rsdp->length) != 0)) 499 return NULL; 500 debug("acpi rsdp checksum 2 passed\n"); 501 502 return rsdp; 503 } 504 505 struct acpi_fadt *acpi_find_fadt(void) 506 { 507 char *p, *end; 508 struct acpi_rsdp *rsdp = NULL; 509 struct acpi_rsdt *rsdt; 510 struct acpi_fadt *fadt = NULL; 511 int i; 512 513 /* Find RSDP */ 514 for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) { 515 rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p); 516 if (rsdp) 517 break; 518 } 519 520 if (rsdp == NULL) 521 return NULL; 522 523 debug("RSDP found at %p\n", rsdp); 524 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address; 525 526 end = (char *)rsdt + rsdt->header.length; 527 debug("RSDT found at %p ends at %p\n", rsdt, end); 528 529 for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) { 530 fadt = (struct acpi_fadt *)rsdt->entry[i]; 531 if (strncmp((char *)fadt, "FACP", 4) == 0) 532 break; 533 fadt = NULL; 534 } 535 536 if (fadt == NULL) 537 return NULL; 538 539 debug("FADT found at %p\n", fadt); 540 return fadt; 541 } 542 543 void *acpi_find_wakeup_vector(struct acpi_fadt *fadt) 544 { 545 struct acpi_facs *facs; 546 void *wake_vec; 547 548 debug("Trying to find the wakeup vector...\n"); 549 550 facs = (struct acpi_facs *)fadt->firmware_ctrl; 551 552 if (facs == NULL) { 553 debug("No FACS found, wake up from S3 not possible.\n"); 554 return NULL; 555 } 556 557 debug("FACS found at %p\n", facs); 558 wake_vec = (void *)facs->firmware_waking_vector; 559 debug("OS waking vector is %p\n", wake_vec); 560 561 return wake_vec; 562 } 563