2 * Based on acpi.c from coreboot
4 * Copyright (C) 2015, Saket Sinha <saket.sinha89@gmail.com>
5 * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
7 * SPDX-License-Identifier: GPL-2.0+
13 #include <dm/uclass-internal.h>
15 #include <asm/acpi/global_nvs.h>
16 #include <asm/acpi_table.h>
18 #include <asm/ioapic.h>
19 #include <asm/lapic.h>
20 #include <asm/mpspec.h>
21 #include <asm/tables.h>
22 #include <asm/arch/global_nvs.h>
25 * IASL compiles the dsdt entries and writes the hex values
26 * to a C array AmlCode[] (see dsdt.c).
28 extern const unsigned char AmlCode[];
30 /* ACPI RSDP address to be used in boot parameters */
31 static ulong acpi_rsdp_addr;
33 static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
34 struct acpi_xsdt *xsdt)
36 memset(rsdp, 0, sizeof(struct acpi_rsdp));
38 memcpy(rsdp->signature, RSDP_SIG, 8);
39 memcpy(rsdp->oem_id, OEM_ID, 6);
41 rsdp->length = sizeof(struct acpi_rsdp);
42 rsdp->rsdt_address = (u32)rsdt;
45 * Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2
47 * Some OSes expect an XSDT to be present for RSD PTR revisions >= 2.
48 * If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR
52 rsdp->revision = ACPI_RSDP_REV_ACPI_1_0;
54 rsdp->xsdt_address = (u64)(u32)xsdt;
55 rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
58 /* Calculate checksums */
59 rsdp->checksum = table_compute_checksum((void *)rsdp, 20);
60 rsdp->ext_checksum = table_compute_checksum((void *)rsdp,
61 sizeof(struct acpi_rsdp));
64 void acpi_fill_header(struct acpi_table_header *header, char *signature)
66 memcpy(header->signature, signature, 4);
67 memcpy(header->oem_id, OEM_ID, 6);
68 memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
69 header->oem_revision = U_BOOT_BUILD_DATE;
70 memcpy(header->aslc_id, ASLC_ID, 4);
73 static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
75 struct acpi_table_header *header = &(rsdt->header);
77 /* Fill out header fields */
78 acpi_fill_header(header, "RSDT");
79 header->length = sizeof(struct acpi_rsdt);
82 /* Entries are filled in later, we come with an empty set */
85 header->checksum = table_compute_checksum((void *)rsdt,
86 sizeof(struct acpi_rsdt));
89 static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
91 struct acpi_table_header *header = &(xsdt->header);
93 /* Fill out header fields */
94 acpi_fill_header(header, "XSDT");
95 header->length = sizeof(struct acpi_xsdt);
98 /* Entries are filled in later, we come with an empty set */
101 header->checksum = table_compute_checksum((void *)xsdt,
102 sizeof(struct acpi_xsdt));
106 * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
109 static void acpi_add_table(struct acpi_rsdp *rsdp, void *table)
112 struct acpi_rsdt *rsdt;
113 struct acpi_xsdt *xsdt = NULL;
115 /* The RSDT is mandatory while the XSDT is not */
116 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
118 if (rsdp->xsdt_address)
119 xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address);
121 /* This should always be MAX_ACPI_TABLES */
122 entries_num = ARRAY_SIZE(rsdt->entry);
124 for (i = 0; i < entries_num; i++) {
125 if (rsdt->entry[i] == 0)
129 if (i >= entries_num) {
130 debug("ACPI: Error: too many tables\n");
134 /* Add table to the RSDT */
135 rsdt->entry[i] = (u32)table;
137 /* Fix RSDT length or the kernel will assume invalid entries */
138 rsdt->header.length = sizeof(struct acpi_table_header) +
139 (sizeof(u32) * (i + 1));
141 /* Re-calculate checksum */
142 rsdt->header.checksum = 0;
143 rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
144 rsdt->header.length);
147 * And now the same thing for the XSDT. We use the same index as for
148 * now we want the XSDT and RSDT to always be in sync in U-Boot
151 /* Add table to the XSDT */
152 xsdt->entry[i] = (u64)(u32)table;
154 /* Fix XSDT length */
155 xsdt->header.length = sizeof(struct acpi_table_header) +
156 (sizeof(u64) * (i + 1));
158 /* Re-calculate checksum */
159 xsdt->header.checksum = 0;
160 xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
161 xsdt->header.length);
165 static void acpi_create_facs(struct acpi_facs *facs)
167 memset((void *)facs, 0, sizeof(struct acpi_facs));
169 memcpy(facs->signature, "FACS", 4);
170 facs->length = sizeof(struct acpi_facs);
171 facs->hardware_signature = 0;
172 facs->firmware_waking_vector = 0;
173 facs->global_lock = 0;
175 facs->x_firmware_waking_vector_l = 0;
176 facs->x_firmware_waking_vector_h = 0;
180 static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic,
183 lapic->type = ACPI_APIC_LAPIC;
184 lapic->length = sizeof(struct acpi_madt_lapic);
185 lapic->flags = LOCAL_APIC_FLAG_ENABLED;
186 lapic->processor_id = cpu;
187 lapic->apic_id = apic;
189 return lapic->length;
192 int acpi_create_madt_lapics(u32 current)
195 int total_length = 0;
197 for (uclass_find_first_device(UCLASS_CPU, &dev);
199 uclass_find_next_device(&dev)) {
200 struct cpu_platdata *plat = dev_get_parent_platdata(dev);
201 int length = acpi_create_madt_lapic(
202 (struct acpi_madt_lapic *)current,
203 plat->cpu_id, plat->cpu_id);
205 total_length += length;
211 int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id,
212 u32 addr, u32 gsi_base)
214 ioapic->type = ACPI_APIC_IOAPIC;
215 ioapic->length = sizeof(struct acpi_madt_ioapic);
216 ioapic->reserved = 0x00;
217 ioapic->gsi_base = gsi_base;
218 ioapic->ioapic_id = id;
219 ioapic->ioapic_addr = addr;
221 return ioapic->length;
224 int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride,
225 u8 bus, u8 source, u32 gsirq, u16 flags)
227 irqoverride->type = ACPI_APIC_IRQ_SRC_OVERRIDE;
228 irqoverride->length = sizeof(struct acpi_madt_irqoverride);
229 irqoverride->bus = bus;
230 irqoverride->source = source;
231 irqoverride->gsirq = gsirq;
232 irqoverride->flags = flags;
234 return irqoverride->length;
237 int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi,
238 u8 cpu, u16 flags, u8 lint)
240 lapic_nmi->type = ACPI_APIC_LAPIC_NMI;
241 lapic_nmi->length = sizeof(struct acpi_madt_lapic_nmi);
242 lapic_nmi->flags = flags;
243 lapic_nmi->processor_id = cpu;
244 lapic_nmi->lint = lint;
246 return lapic_nmi->length;
249 static int acpi_create_madt_irq_overrides(u32 current)
251 struct acpi_madt_irqoverride *irqovr;
252 u16 sci_flags = MP_IRQ_TRIGGER_LEVEL | MP_IRQ_POLARITY_HIGH;
255 irqovr = (void *)current;
256 length += acpi_create_madt_irqoverride(irqovr, 0, 0, 2, 0);
258 irqovr = (void *)(current + length);
259 length += acpi_create_madt_irqoverride(irqovr, 0, 9, 9, sci_flags);
264 __weak u32 acpi_fill_madt(u32 current)
266 current += acpi_create_madt_lapics(current);
268 current += acpi_create_madt_ioapic((struct acpi_madt_ioapic *)current,
269 io_apic_read(IO_APIC_ID) >> 24, IO_APIC_ADDR, 0);
271 current += acpi_create_madt_irq_overrides(current);
276 static void acpi_create_madt(struct acpi_madt *madt)
278 struct acpi_table_header *header = &(madt->header);
279 u32 current = (u32)madt + sizeof(struct acpi_madt);
281 memset((void *)madt, 0, sizeof(struct acpi_madt));
283 /* Fill out header fields */
284 acpi_fill_header(header, "APIC");
285 header->length = sizeof(struct acpi_madt);
286 header->revision = 4;
288 madt->lapic_addr = LAPIC_DEFAULT_BASE;
289 madt->flags = ACPI_MADT_PCAT_COMPAT;
291 current = acpi_fill_madt(current);
293 /* (Re)calculate length and checksum */
294 header->length = current - (u32)madt;
296 header->checksum = table_compute_checksum((void *)madt, header->length);
299 int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
300 u16 seg_nr, u8 start, u8 end)
302 memset(mmconfig, 0, sizeof(*mmconfig));
303 mmconfig->base_address_l = base;
304 mmconfig->base_address_h = 0;
305 mmconfig->pci_segment_group_number = seg_nr;
306 mmconfig->start_bus_number = start;
307 mmconfig->end_bus_number = end;
309 return sizeof(struct acpi_mcfg_mmconfig);
312 __weak u32 acpi_fill_mcfg(u32 current)
314 current += acpi_create_mcfg_mmconfig
315 ((struct acpi_mcfg_mmconfig *)current,
316 CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255);
321 /* MCFG is defined in the PCI Firmware Specification 3.0 */
322 static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
324 struct acpi_table_header *header = &(mcfg->header);
325 u32 current = (u32)mcfg + sizeof(struct acpi_mcfg);
327 memset((void *)mcfg, 0, sizeof(struct acpi_mcfg));
329 /* Fill out header fields */
330 acpi_fill_header(header, "MCFG");
331 header->length = sizeof(struct acpi_mcfg);
332 header->revision = 1;
334 current = acpi_fill_mcfg(current);
336 /* (Re)calculate length and checksum */
337 header->length = current - (u32)mcfg;
338 header->checksum = table_compute_checksum((void *)mcfg, header->length);
341 void enter_acpi_mode(int pm1_cnt)
343 u16 val = inw(pm1_cnt);
346 * PM1_CNT register bit0 selects the power management event to be
347 * either an SCI or SMI interrupt. When this bit is set, then power
348 * management events will generate an SCI interrupt. When this bit
349 * is reset power management events will generate an SMI interrupt.
351 * Per ACPI spec, it is the responsibility of the hardware to set
352 * or reset this bit. OSPM always preserves this bit position.
354 * U-Boot does not support SMI. And we don't have plan to support
355 * anything running in SMM within U-Boot. To create a legacy-free
356 * system, and expose ourselves to OSPM as working under ACPI mode
357 * already, turn this bit on.
359 outw(val | PM1_CNT_SCI_EN, pm1_cnt);
363 * QEMU's version of write_acpi_tables is defined in drivers/misc/qfw.c
365 ulong write_acpi_tables(ulong start)
368 struct acpi_rsdp *rsdp;
369 struct acpi_rsdt *rsdt;
370 struct acpi_xsdt *xsdt;
371 struct acpi_facs *facs;
372 struct acpi_table_header *dsdt;
373 struct acpi_fadt *fadt;
374 struct acpi_mcfg *mcfg;
375 struct acpi_madt *madt;
380 /* Align ACPI tables to 16 byte */
381 current = ALIGN(current, 16);
383 debug("ACPI: Writing ACPI tables at %lx\n", start);
385 /* We need at least an RSDP and an RSDT Table */
386 rsdp = (struct acpi_rsdp *)current;
387 current += sizeof(struct acpi_rsdp);
388 current = ALIGN(current, 16);
389 rsdt = (struct acpi_rsdt *)current;
390 current += sizeof(struct acpi_rsdt);
391 current = ALIGN(current, 16);
392 xsdt = (struct acpi_xsdt *)current;
393 current += sizeof(struct acpi_xsdt);
395 * Per ACPI spec, the FACS table address must be aligned to a 64 byte
396 * boundary (Windows checks this, but Linux does not).
398 current = ALIGN(current, 64);
400 /* clear all table memory */
401 memset((void *)start, 0, current - start);
403 acpi_write_rsdp(rsdp, rsdt, xsdt);
404 acpi_write_rsdt(rsdt);
405 acpi_write_xsdt(xsdt);
407 debug("ACPI: * FACS\n");
408 facs = (struct acpi_facs *)current;
409 current += sizeof(struct acpi_facs);
410 current = ALIGN(current, 16);
412 acpi_create_facs(facs);
414 debug("ACPI: * DSDT\n");
415 dsdt = (struct acpi_table_header *)current;
416 memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header));
417 current += sizeof(struct acpi_table_header);
418 memcpy((char *)current,
419 (char *)&AmlCode + sizeof(struct acpi_table_header),
420 dsdt->length - sizeof(struct acpi_table_header));
421 current += dsdt->length - sizeof(struct acpi_table_header);
422 current = ALIGN(current, 16);
424 /* Pack GNVS into the ACPI table area */
425 for (i = 0; i < dsdt->length; i++) {
426 u32 *gnvs = (u32 *)((u32)dsdt + i);
427 if (*gnvs == ACPI_GNVS_ADDR) {
428 debug("Fix up global NVS in DSDT to 0x%08x\n", current);
434 /* Update DSDT checksum since we patched the GNVS address */
436 dsdt->checksum = table_compute_checksum((void *)dsdt, dsdt->length);
438 /* Fill in platform-specific global NVS variables */
439 acpi_create_gnvs((struct acpi_global_nvs *)current);
440 current += sizeof(struct acpi_global_nvs);
441 current = ALIGN(current, 16);
443 debug("ACPI: * FADT\n");
444 fadt = (struct acpi_fadt *)current;
445 current += sizeof(struct acpi_fadt);
446 current = ALIGN(current, 16);
447 acpi_create_fadt(fadt, facs, dsdt);
448 acpi_add_table(rsdp, fadt);
450 debug("ACPI: * MADT\n");
451 madt = (struct acpi_madt *)current;
452 acpi_create_madt(madt);
453 current += madt->header.length;
454 acpi_add_table(rsdp, madt);
455 current = ALIGN(current, 16);
457 debug("ACPI: * MCFG\n");
458 mcfg = (struct acpi_mcfg *)current;
459 acpi_create_mcfg(mcfg);
460 current += mcfg->header.length;
461 acpi_add_table(rsdp, mcfg);
462 current = ALIGN(current, 16);
464 debug("current = %x\n", current);
466 acpi_rsdp_addr = (unsigned long)rsdp;
467 debug("ACPI: done\n");
469 /* Don't touch ACPI hardware on HW reduced platforms */
470 if (fadt->flags & ACPI_FADT_HW_REDUCED_ACPI)
474 * Other than waiting for OSPM to request us to switch to ACPI mode,
475 * do it by ourselves, since SMI will not be triggered.
477 enter_acpi_mode(fadt->pm1a_cnt_blk);
482 ulong acpi_get_rsdp_addr(void)
484 return acpi_rsdp_addr;
487 static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp)
489 if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
492 debug("Looking on %p for valid checksum\n", rsdp);
494 if (table_compute_checksum((void *)rsdp, 20) != 0)
496 debug("acpi rsdp checksum 1 passed\n");
498 if ((rsdp->revision > 1) &&
499 (table_compute_checksum((void *)rsdp, rsdp->length) != 0))
501 debug("acpi rsdp checksum 2 passed\n");
506 struct acpi_fadt *acpi_find_fadt(void)
509 struct acpi_rsdp *rsdp = NULL;
510 struct acpi_rsdt *rsdt;
511 struct acpi_fadt *fadt = NULL;
515 for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) {
516 rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p);
524 debug("RSDP found at %p\n", rsdp);
525 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
527 end = (char *)rsdt + rsdt->header.length;
528 debug("RSDT found at %p ends at %p\n", rsdt, end);
530 for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) {
531 fadt = (struct acpi_fadt *)rsdt->entry[i];
532 if (strncmp((char *)fadt, "FACP", 4) == 0)
540 debug("FADT found at %p\n", fadt);
544 void *acpi_find_wakeup_vector(struct acpi_fadt *fadt)
546 struct acpi_facs *facs;
549 debug("Trying to find the wakeup vector...\n");
551 facs = (struct acpi_facs *)fadt->firmware_ctrl;
554 debug("No FACS found, wake up from S3 not possible.\n");
558 debug("FACS found at %p\n", facs);
559 wake_vec = (void *)facs->firmware_waking_vector;
560 debug("OS waking vector is %p\n", wake_vec);