1 /* 2 * Based on acpi.c from coreboot 3 * 4 * Copyright (C) 2015, Saket Sinha <saket.sinha89@gmail.com> 5 * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com> 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <cpu.h> 12 #include <dm.h> 13 #include <dm/uclass-internal.h> 14 #include <asm/acpi_table.h> 15 #include <asm/io.h> 16 #include <asm/lapic.h> 17 #include <asm/tables.h> 18 19 /* 20 * IASL compiles the dsdt entries and writes the hex values 21 * to a C array AmlCode[] (see dsdt.c). 22 */ 23 extern const unsigned char AmlCode[]; 24 25 static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt, 26 struct acpi_xsdt *xsdt) 27 { 28 memset(rsdp, 0, sizeof(struct acpi_rsdp)); 29 30 memcpy(rsdp->signature, RSDP_SIG, 8); 31 memcpy(rsdp->oem_id, OEM_ID, 6); 32 33 rsdp->length = sizeof(struct acpi_rsdp); 34 rsdp->rsdt_address = (u32)rsdt; 35 36 /* 37 * Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2 38 * 39 * Some OSes expect an XSDT to be present for RSD PTR revisions >= 2. 40 * If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR 41 * revision 0) 42 */ 43 if (xsdt == NULL) { 44 rsdp->revision = ACPI_RSDP_REV_ACPI_1_0; 45 } else { 46 rsdp->xsdt_address = (u64)(u32)xsdt; 47 rsdp->revision = ACPI_RSDP_REV_ACPI_2_0; 48 } 49 50 /* Calculate checksums */ 51 rsdp->checksum = table_compute_checksum((void *)rsdp, 20); 52 rsdp->ext_checksum = table_compute_checksum((void *)rsdp, 53 sizeof(struct acpi_rsdp)); 54 } 55 56 void acpi_fill_header(struct acpi_table_header *header, char *signature) 57 { 58 memcpy(header->signature, signature, 4); 59 memcpy(header->oem_id, OEM_ID, 6); 60 memcpy(header->oem_table_id, OEM_TABLE_ID, 8); 61 memcpy(header->aslc_id, ASLC_ID, 4); 62 } 63 64 static void acpi_write_rsdt(struct acpi_rsdt *rsdt) 65 { 66 struct acpi_table_header *header = &(rsdt->header); 67 68 /* Fill out header fields */ 69 acpi_fill_header(header, "RSDT"); 70 header->length = sizeof(struct acpi_rsdt); 71 header->revision = 1; 72 73 /* Entries are filled in later, we come with an empty set */ 74 75 /* Fix checksum */ 76 header->checksum = table_compute_checksum((void *)rsdt, 77 sizeof(struct acpi_rsdt)); 78 } 79 80 static void acpi_write_xsdt(struct acpi_xsdt *xsdt) 81 { 82 struct acpi_table_header *header = &(xsdt->header); 83 84 /* Fill out header fields */ 85 acpi_fill_header(header, "XSDT"); 86 header->length = sizeof(struct acpi_xsdt); 87 header->revision = 1; 88 89 /* Entries are filled in later, we come with an empty set */ 90 91 /* Fix checksum */ 92 header->checksum = table_compute_checksum((void *)xsdt, 93 sizeof(struct acpi_xsdt)); 94 } 95 96 /** 97 * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length 98 * and checksum. 99 */ 100 static void acpi_add_table(struct acpi_rsdp *rsdp, void *table) 101 { 102 int i, entries_num; 103 struct acpi_rsdt *rsdt; 104 struct acpi_xsdt *xsdt = NULL; 105 106 /* The RSDT is mandatory while the XSDT is not */ 107 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address; 108 109 if (rsdp->xsdt_address) 110 xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address); 111 112 /* This should always be MAX_ACPI_TABLES */ 113 entries_num = ARRAY_SIZE(rsdt->entry); 114 115 for (i = 0; i < entries_num; i++) { 116 if (rsdt->entry[i] == 0) 117 break; 118 } 119 120 if (i >= entries_num) { 121 debug("ACPI: Error: too many tables\n"); 122 return; 123 } 124 125 /* Add table to the RSDT */ 126 rsdt->entry[i] = (u32)table; 127 128 /* Fix RSDT length or the kernel will assume invalid entries */ 129 rsdt->header.length = sizeof(struct acpi_table_header) + 130 (sizeof(u32) * (i + 1)); 131 132 /* Re-calculate checksum */ 133 rsdt->header.checksum = 0; 134 rsdt->header.checksum = table_compute_checksum((u8 *)rsdt, 135 rsdt->header.length); 136 137 /* 138 * And now the same thing for the XSDT. We use the same index as for 139 * now we want the XSDT and RSDT to always be in sync in U-Boot 140 */ 141 if (xsdt) { 142 /* Add table to the XSDT */ 143 xsdt->entry[i] = (u64)(u32)table; 144 145 /* Fix XSDT length */ 146 xsdt->header.length = sizeof(struct acpi_table_header) + 147 (sizeof(u64) * (i + 1)); 148 149 /* Re-calculate checksum */ 150 xsdt->header.checksum = 0; 151 xsdt->header.checksum = table_compute_checksum((u8 *)xsdt, 152 xsdt->header.length); 153 } 154 } 155 156 static void acpi_create_facs(struct acpi_facs *facs) 157 { 158 memset((void *)facs, 0, sizeof(struct acpi_facs)); 159 160 memcpy(facs->signature, "FACS", 4); 161 facs->length = sizeof(struct acpi_facs); 162 facs->hardware_signature = 0; 163 facs->firmware_waking_vector = 0; 164 facs->global_lock = 0; 165 facs->flags = 0; 166 facs->x_firmware_waking_vector_l = 0; 167 facs->x_firmware_waking_vector_h = 0; 168 facs->version = 1; 169 } 170 171 static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic, 172 u8 cpu, u8 apic) 173 { 174 lapic->type = ACPI_APIC_LAPIC; 175 lapic->length = sizeof(struct acpi_madt_lapic); 176 lapic->flags = LOCAL_APIC_FLAG_ENABLED; 177 lapic->processor_id = cpu; 178 lapic->apic_id = apic; 179 180 return lapic->length; 181 } 182 183 int acpi_create_madt_lapics(u32 current) 184 { 185 struct udevice *dev; 186 int total_length = 0; 187 188 for (uclass_find_first_device(UCLASS_CPU, &dev); 189 dev; 190 uclass_find_next_device(&dev)) { 191 struct cpu_platdata *plat = dev_get_parent_platdata(dev); 192 int length = acpi_create_madt_lapic( 193 (struct acpi_madt_lapic *)current, 194 plat->cpu_id, plat->cpu_id); 195 current += length; 196 total_length += length; 197 } 198 199 return total_length; 200 } 201 202 int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id, 203 u32 addr, u32 gsi_base) 204 { 205 ioapic->type = ACPI_APIC_IOAPIC; 206 ioapic->length = sizeof(struct acpi_madt_ioapic); 207 ioapic->reserved = 0x00; 208 ioapic->gsi_base = gsi_base; 209 ioapic->ioapic_id = id; 210 ioapic->ioapic_addr = addr; 211 212 return ioapic->length; 213 } 214 215 int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride, 216 u8 bus, u8 source, u32 gsirq, u16 flags) 217 { 218 irqoverride->type = ACPI_APIC_IRQ_SRC_OVERRIDE; 219 irqoverride->length = sizeof(struct acpi_madt_irqoverride); 220 irqoverride->bus = bus; 221 irqoverride->source = source; 222 irqoverride->gsirq = gsirq; 223 irqoverride->flags = flags; 224 225 return irqoverride->length; 226 } 227 228 int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi, 229 u8 cpu, u16 flags, u8 lint) 230 { 231 lapic_nmi->type = ACPI_APIC_LAPIC_NMI; 232 lapic_nmi->length = sizeof(struct acpi_madt_lapic_nmi); 233 lapic_nmi->flags = flags; 234 lapic_nmi->processor_id = cpu; 235 lapic_nmi->lint = lint; 236 237 return lapic_nmi->length; 238 } 239 240 static void acpi_create_madt(struct acpi_madt *madt) 241 { 242 struct acpi_table_header *header = &(madt->header); 243 u32 current = (u32)madt + sizeof(struct acpi_madt); 244 245 memset((void *)madt, 0, sizeof(struct acpi_madt)); 246 247 /* Fill out header fields */ 248 acpi_fill_header(header, "APIC"); 249 header->length = sizeof(struct acpi_madt); 250 header->revision = 4; 251 252 madt->lapic_addr = LAPIC_DEFAULT_BASE; 253 madt->flags = ACPI_MADT_PCAT_COMPAT; 254 255 current = acpi_fill_madt(current); 256 257 /* (Re)calculate length and checksum */ 258 header->length = current - (u32)madt; 259 260 header->checksum = table_compute_checksum((void *)madt, header->length); 261 } 262 263 static int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, 264 u32 base, u16 seg_nr, u8 start, u8 end) 265 { 266 memset(mmconfig, 0, sizeof(*mmconfig)); 267 mmconfig->base_address_l = base; 268 mmconfig->base_address_h = 0; 269 mmconfig->pci_segment_group_number = seg_nr; 270 mmconfig->start_bus_number = start; 271 mmconfig->end_bus_number = end; 272 273 return sizeof(struct acpi_mcfg_mmconfig); 274 } 275 276 static u32 acpi_fill_mcfg(u32 current) 277 { 278 current += acpi_create_mcfg_mmconfig 279 ((struct acpi_mcfg_mmconfig *)current, 280 CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255); 281 282 return current; 283 } 284 285 /* MCFG is defined in the PCI Firmware Specification 3.0 */ 286 static void acpi_create_mcfg(struct acpi_mcfg *mcfg) 287 { 288 struct acpi_table_header *header = &(mcfg->header); 289 u32 current = (u32)mcfg + sizeof(struct acpi_mcfg); 290 291 memset((void *)mcfg, 0, sizeof(struct acpi_mcfg)); 292 293 /* Fill out header fields */ 294 acpi_fill_header(header, "MCFG"); 295 header->length = sizeof(struct acpi_mcfg); 296 header->revision = 1; 297 298 current = acpi_fill_mcfg(current); 299 300 /* (Re)calculate length and checksum */ 301 header->length = current - (u32)mcfg; 302 header->checksum = table_compute_checksum((void *)mcfg, header->length); 303 } 304 305 static void enter_acpi_mode(int pm1_cnt) 306 { 307 /* 308 * PM1_CNT register bit0 selects the power management event to be 309 * either an SCI or SMI interrupt. When this bit is set, then power 310 * management events will generate an SCI interrupt. When this bit 311 * is reset power management events will generate an SMI interrupt. 312 * 313 * Per ACPI spec, it is the responsibility of the hardware to set 314 * or reset this bit. OSPM always preserves this bit position. 315 * 316 * U-Boot does not support SMI. And we don't have plan to support 317 * anything running in SMM within U-Boot. To create a legacy-free 318 * system, and expose ourselves to OSPM as working under ACPI mode 319 * already, turn this bit on. 320 */ 321 outw(PM1_CNT_SCI_EN, pm1_cnt); 322 } 323 324 /* 325 * QEMU's version of write_acpi_tables is defined in 326 * arch/x86/cpu/qemu/acpi_table.c 327 */ 328 u32 write_acpi_tables(u32 start) 329 { 330 u32 current; 331 struct acpi_rsdp *rsdp; 332 struct acpi_rsdt *rsdt; 333 struct acpi_xsdt *xsdt; 334 struct acpi_facs *facs; 335 struct acpi_table_header *dsdt; 336 struct acpi_fadt *fadt; 337 struct acpi_mcfg *mcfg; 338 struct acpi_madt *madt; 339 340 current = start; 341 342 /* Align ACPI tables to 16 byte */ 343 current = ALIGN(current, 16); 344 345 debug("ACPI: Writing ACPI tables at %x\n", start); 346 347 /* We need at least an RSDP and an RSDT Table */ 348 rsdp = (struct acpi_rsdp *)current; 349 current += sizeof(struct acpi_rsdp); 350 current = ALIGN(current, 16); 351 rsdt = (struct acpi_rsdt *)current; 352 current += sizeof(struct acpi_rsdt); 353 current = ALIGN(current, 16); 354 xsdt = (struct acpi_xsdt *)current; 355 current += sizeof(struct acpi_xsdt); 356 /* 357 * Per ACPI spec, the FACS table address must be aligned to a 64 byte 358 * boundary (Windows checks this, but Linux does not). 359 */ 360 current = ALIGN(current, 64); 361 362 /* clear all table memory */ 363 memset((void *)start, 0, current - start); 364 365 acpi_write_rsdp(rsdp, rsdt, xsdt); 366 acpi_write_rsdt(rsdt); 367 acpi_write_xsdt(xsdt); 368 369 debug("ACPI: * FACS\n"); 370 facs = (struct acpi_facs *)current; 371 current += sizeof(struct acpi_facs); 372 current = ALIGN(current, 16); 373 374 acpi_create_facs(facs); 375 376 debug("ACPI: * DSDT\n"); 377 dsdt = (struct acpi_table_header *)current; 378 memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header)); 379 current += sizeof(struct acpi_table_header); 380 memcpy((char *)current, 381 (char *)&AmlCode + sizeof(struct acpi_table_header), 382 dsdt->length - sizeof(struct acpi_table_header)); 383 current += dsdt->length - sizeof(struct acpi_table_header); 384 current = ALIGN(current, 16); 385 386 debug("ACPI: * FADT\n"); 387 fadt = (struct acpi_fadt *)current; 388 current += sizeof(struct acpi_fadt); 389 current = ALIGN(current, 16); 390 acpi_create_fadt(fadt, facs, dsdt); 391 acpi_add_table(rsdp, fadt); 392 393 debug("ACPI: * MADT\n"); 394 madt = (struct acpi_madt *)current; 395 acpi_create_madt(madt); 396 current += madt->header.length; 397 acpi_add_table(rsdp, madt); 398 current = ALIGN(current, 16); 399 400 debug("ACPI: * MCFG\n"); 401 mcfg = (struct acpi_mcfg *)current; 402 acpi_create_mcfg(mcfg); 403 current += mcfg->header.length; 404 acpi_add_table(rsdp, mcfg); 405 current = ALIGN(current, 16); 406 407 debug("current = %x\n", current); 408 409 debug("ACPI: done\n"); 410 411 /* 412 * Other than waiting for OSPM to request us to switch to ACPI mode, 413 * do it by ourselves, since SMI will not be triggered. 414 */ 415 enter_acpi_mode(fadt->pm1a_cnt_blk); 416 417 return current; 418 } 419