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 static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
31 struct acpi_xsdt *xsdt)
33 memset(rsdp, 0, sizeof(struct acpi_rsdp));
35 memcpy(rsdp->signature, RSDP_SIG, 8);
36 memcpy(rsdp->oem_id, OEM_ID, 6);
38 rsdp->length = sizeof(struct acpi_rsdp);
39 rsdp->rsdt_address = (u32)rsdt;
42 * Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2
44 * Some OSes expect an XSDT to be present for RSD PTR revisions >= 2.
45 * If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR
49 rsdp->revision = ACPI_RSDP_REV_ACPI_1_0;
51 rsdp->xsdt_address = (u64)(u32)xsdt;
52 rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
55 /* Calculate checksums */
56 rsdp->checksum = table_compute_checksum((void *)rsdp, 20);
57 rsdp->ext_checksum = table_compute_checksum((void *)rsdp,
58 sizeof(struct acpi_rsdp));
61 void acpi_fill_header(struct acpi_table_header *header, char *signature)
63 memcpy(header->signature, signature, 4);
64 memcpy(header->oem_id, OEM_ID, 6);
65 memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
66 header->oem_revision = U_BOOT_BUILD_DATE;
67 memcpy(header->aslc_id, ASLC_ID, 4);
70 static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
72 struct acpi_table_header *header = &(rsdt->header);
74 /* Fill out header fields */
75 acpi_fill_header(header, "RSDT");
76 header->length = sizeof(struct acpi_rsdt);
79 /* Entries are filled in later, we come with an empty set */
82 header->checksum = table_compute_checksum((void *)rsdt,
83 sizeof(struct acpi_rsdt));
86 static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
88 struct acpi_table_header *header = &(xsdt->header);
90 /* Fill out header fields */
91 acpi_fill_header(header, "XSDT");
92 header->length = sizeof(struct acpi_xsdt);
95 /* Entries are filled in later, we come with an empty set */
98 header->checksum = table_compute_checksum((void *)xsdt,
99 sizeof(struct acpi_xsdt));
103 * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
106 static void acpi_add_table(struct acpi_rsdp *rsdp, void *table)
109 struct acpi_rsdt *rsdt;
110 struct acpi_xsdt *xsdt = NULL;
112 /* The RSDT is mandatory while the XSDT is not */
113 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
115 if (rsdp->xsdt_address)
116 xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address);
118 /* This should always be MAX_ACPI_TABLES */
119 entries_num = ARRAY_SIZE(rsdt->entry);
121 for (i = 0; i < entries_num; i++) {
122 if (rsdt->entry[i] == 0)
126 if (i >= entries_num) {
127 debug("ACPI: Error: too many tables\n");
131 /* Add table to the RSDT */
132 rsdt->entry[i] = (u32)table;
134 /* Fix RSDT length or the kernel will assume invalid entries */
135 rsdt->header.length = sizeof(struct acpi_table_header) +
136 (sizeof(u32) * (i + 1));
138 /* Re-calculate checksum */
139 rsdt->header.checksum = 0;
140 rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
141 rsdt->header.length);
144 * And now the same thing for the XSDT. We use the same index as for
145 * now we want the XSDT and RSDT to always be in sync in U-Boot
148 /* Add table to the XSDT */
149 xsdt->entry[i] = (u64)(u32)table;
151 /* Fix XSDT length */
152 xsdt->header.length = sizeof(struct acpi_table_header) +
153 (sizeof(u64) * (i + 1));
155 /* Re-calculate checksum */
156 xsdt->header.checksum = 0;
157 xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
158 xsdt->header.length);
162 static void acpi_create_facs(struct acpi_facs *facs)
164 memset((void *)facs, 0, sizeof(struct acpi_facs));
166 memcpy(facs->signature, "FACS", 4);
167 facs->length = sizeof(struct acpi_facs);
168 facs->hardware_signature = 0;
169 facs->firmware_waking_vector = 0;
170 facs->global_lock = 0;
172 facs->x_firmware_waking_vector_l = 0;
173 facs->x_firmware_waking_vector_h = 0;
177 static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic,
180 lapic->type = ACPI_APIC_LAPIC;
181 lapic->length = sizeof(struct acpi_madt_lapic);
182 lapic->flags = LOCAL_APIC_FLAG_ENABLED;
183 lapic->processor_id = cpu;
184 lapic->apic_id = apic;
186 return lapic->length;
189 int acpi_create_madt_lapics(u32 current)
192 int total_length = 0;
194 for (uclass_find_first_device(UCLASS_CPU, &dev);
196 uclass_find_next_device(&dev)) {
197 struct cpu_platdata *plat = dev_get_parent_platdata(dev);
198 int length = acpi_create_madt_lapic(
199 (struct acpi_madt_lapic *)current,
200 plat->cpu_id, plat->cpu_id);
202 total_length += length;
208 int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id,
209 u32 addr, u32 gsi_base)
211 ioapic->type = ACPI_APIC_IOAPIC;
212 ioapic->length = sizeof(struct acpi_madt_ioapic);
213 ioapic->reserved = 0x00;
214 ioapic->gsi_base = gsi_base;
215 ioapic->ioapic_id = id;
216 ioapic->ioapic_addr = addr;
218 return ioapic->length;
221 int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride,
222 u8 bus, u8 source, u32 gsirq, u16 flags)
224 irqoverride->type = ACPI_APIC_IRQ_SRC_OVERRIDE;
225 irqoverride->length = sizeof(struct acpi_madt_irqoverride);
226 irqoverride->bus = bus;
227 irqoverride->source = source;
228 irqoverride->gsirq = gsirq;
229 irqoverride->flags = flags;
231 return irqoverride->length;
234 int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi,
235 u8 cpu, u16 flags, u8 lint)
237 lapic_nmi->type = ACPI_APIC_LAPIC_NMI;
238 lapic_nmi->length = sizeof(struct acpi_madt_lapic_nmi);
239 lapic_nmi->flags = flags;
240 lapic_nmi->processor_id = cpu;
241 lapic_nmi->lint = lint;
243 return lapic_nmi->length;
246 static int acpi_create_madt_irq_overrides(u32 current)
248 struct acpi_madt_irqoverride *irqovr;
249 u16 sci_flags = MP_IRQ_TRIGGER_LEVEL | MP_IRQ_POLARITY_HIGH;
252 irqovr = (void *)current;
253 length += acpi_create_madt_irqoverride(irqovr, 0, 0, 2, 0);
255 irqovr = (void *)(current + length);
256 length += acpi_create_madt_irqoverride(irqovr, 0, 9, 9, sci_flags);
261 __weak u32 acpi_fill_madt(u32 current)
263 current += acpi_create_madt_lapics(current);
265 current += acpi_create_madt_ioapic((struct acpi_madt_ioapic *)current,
266 io_apic_read(IO_APIC_ID) >> 24, IO_APIC_ADDR, 0);
268 current += acpi_create_madt_irq_overrides(current);
273 static void acpi_create_madt(struct acpi_madt *madt)
275 struct acpi_table_header *header = &(madt->header);
276 u32 current = (u32)madt + sizeof(struct acpi_madt);
278 memset((void *)madt, 0, sizeof(struct acpi_madt));
280 /* Fill out header fields */
281 acpi_fill_header(header, "APIC");
282 header->length = sizeof(struct acpi_madt);
283 header->revision = 4;
285 madt->lapic_addr = LAPIC_DEFAULT_BASE;
286 madt->flags = ACPI_MADT_PCAT_COMPAT;
288 current = acpi_fill_madt(current);
290 /* (Re)calculate length and checksum */
291 header->length = current - (u32)madt;
293 header->checksum = table_compute_checksum((void *)madt, header->length);
296 int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
297 u16 seg_nr, u8 start, u8 end)
299 memset(mmconfig, 0, sizeof(*mmconfig));
300 mmconfig->base_address_l = base;
301 mmconfig->base_address_h = 0;
302 mmconfig->pci_segment_group_number = seg_nr;
303 mmconfig->start_bus_number = start;
304 mmconfig->end_bus_number = end;
306 return sizeof(struct acpi_mcfg_mmconfig);
309 __weak u32 acpi_fill_mcfg(u32 current)
311 current += acpi_create_mcfg_mmconfig
312 ((struct acpi_mcfg_mmconfig *)current,
313 CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255);
318 /* MCFG is defined in the PCI Firmware Specification 3.0 */
319 static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
321 struct acpi_table_header *header = &(mcfg->header);
322 u32 current = (u32)mcfg + sizeof(struct acpi_mcfg);
324 memset((void *)mcfg, 0, sizeof(struct acpi_mcfg));
326 /* Fill out header fields */
327 acpi_fill_header(header, "MCFG");
328 header->length = sizeof(struct acpi_mcfg);
329 header->revision = 1;
331 current = acpi_fill_mcfg(current);
333 /* (Re)calculate length and checksum */
334 header->length = current - (u32)mcfg;
335 header->checksum = table_compute_checksum((void *)mcfg, header->length);
338 void enter_acpi_mode(int pm1_cnt)
340 u16 val = inw(pm1_cnt);
343 * PM1_CNT register bit0 selects the power management event to be
344 * either an SCI or SMI interrupt. When this bit is set, then power
345 * management events will generate an SCI interrupt. When this bit
346 * is reset power management events will generate an SMI interrupt.
348 * Per ACPI spec, it is the responsibility of the hardware to set
349 * or reset this bit. OSPM always preserves this bit position.
351 * U-Boot does not support SMI. And we don't have plan to support
352 * anything running in SMM within U-Boot. To create a legacy-free
353 * system, and expose ourselves to OSPM as working under ACPI mode
354 * already, turn this bit on.
356 outw(val | PM1_CNT_SCI_EN, pm1_cnt);
360 * QEMU's version of write_acpi_tables is defined in
361 * arch/x86/cpu/qemu/acpi_table.c
363 ulong write_acpi_tables(ulong start)
366 struct acpi_rsdp *rsdp;
367 struct acpi_rsdt *rsdt;
368 struct acpi_xsdt *xsdt;
369 struct acpi_facs *facs;
370 struct acpi_table_header *dsdt;
371 struct acpi_fadt *fadt;
372 struct acpi_mcfg *mcfg;
373 struct acpi_madt *madt;
378 /* Align ACPI tables to 16 byte */
379 current = ALIGN(current, 16);
381 debug("ACPI: Writing ACPI tables at %lx\n", start);
383 /* We need at least an RSDP and an RSDT Table */
384 rsdp = (struct acpi_rsdp *)current;
385 current += sizeof(struct acpi_rsdp);
386 current = ALIGN(current, 16);
387 rsdt = (struct acpi_rsdt *)current;
388 current += sizeof(struct acpi_rsdt);
389 current = ALIGN(current, 16);
390 xsdt = (struct acpi_xsdt *)current;
391 current += sizeof(struct acpi_xsdt);
393 * Per ACPI spec, the FACS table address must be aligned to a 64 byte
394 * boundary (Windows checks this, but Linux does not).
396 current = ALIGN(current, 64);
398 /* clear all table memory */
399 memset((void *)start, 0, current - start);
401 acpi_write_rsdp(rsdp, rsdt, xsdt);
402 acpi_write_rsdt(rsdt);
403 acpi_write_xsdt(xsdt);
405 debug("ACPI: * FACS\n");
406 facs = (struct acpi_facs *)current;
407 current += sizeof(struct acpi_facs);
408 current = ALIGN(current, 16);
410 acpi_create_facs(facs);
412 debug("ACPI: * DSDT\n");
413 dsdt = (struct acpi_table_header *)current;
414 memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header));
415 current += sizeof(struct acpi_table_header);
416 memcpy((char *)current,
417 (char *)&AmlCode + sizeof(struct acpi_table_header),
418 dsdt->length - sizeof(struct acpi_table_header));
419 current += dsdt->length - sizeof(struct acpi_table_header);
420 current = ALIGN(current, 16);
422 /* Pack GNVS into the ACPI table area */
423 for (i = 0; i < dsdt->length; i++) {
424 u32 *gnvs = (u32 *)((u32)dsdt + i);
425 if (*gnvs == ACPI_GNVS_ADDR) {
426 debug("Fix up global NVS in DSDT to 0x%08x\n", current);
432 /* Update DSDT checksum since we patched the GNVS address */
434 dsdt->checksum = table_compute_checksum((void *)dsdt, dsdt->length);
436 /* Fill in platform-specific global NVS variables */
437 acpi_create_gnvs((struct acpi_global_nvs *)current);
438 current += sizeof(struct acpi_global_nvs);
439 current = ALIGN(current, 16);
441 debug("ACPI: * FADT\n");
442 fadt = (struct acpi_fadt *)current;
443 current += sizeof(struct acpi_fadt);
444 current = ALIGN(current, 16);
445 acpi_create_fadt(fadt, facs, dsdt);
446 acpi_add_table(rsdp, fadt);
448 debug("ACPI: * MADT\n");
449 madt = (struct acpi_madt *)current;
450 acpi_create_madt(madt);
451 current += madt->header.length;
452 acpi_add_table(rsdp, madt);
453 current = ALIGN(current, 16);
455 debug("ACPI: * MCFG\n");
456 mcfg = (struct acpi_mcfg *)current;
457 acpi_create_mcfg(mcfg);
458 current += mcfg->header.length;
459 acpi_add_table(rsdp, mcfg);
460 current = ALIGN(current, 16);
462 debug("current = %x\n", current);
464 debug("ACPI: done\n");
466 /* Don't touch ACPI hardware on HW reduced platforms */
467 if (fadt->flags & ACPI_FADT_HW_REDUCED_ACPI)
471 * Other than waiting for OSPM to request us to switch to ACPI mode,
472 * do it by ourselves, since SMI will not be triggered.
474 enter_acpi_mode(fadt->pm1a_cnt_blk);
479 static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp)
481 if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
484 debug("Looking on %p for valid checksum\n", rsdp);
486 if (table_compute_checksum((void *)rsdp, 20) != 0)
488 debug("acpi rsdp checksum 1 passed\n");
490 if ((rsdp->revision > 1) &&
491 (table_compute_checksum((void *)rsdp, rsdp->length) != 0))
493 debug("acpi rsdp checksum 2 passed\n");
498 struct acpi_fadt *acpi_find_fadt(void)
501 struct acpi_rsdp *rsdp = NULL;
502 struct acpi_rsdt *rsdt;
503 struct acpi_fadt *fadt = NULL;
507 for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) {
508 rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p);
516 debug("RSDP found at %p\n", rsdp);
517 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
519 end = (char *)rsdt + rsdt->header.length;
520 debug("RSDT found at %p ends at %p\n", rsdt, end);
522 for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) {
523 fadt = (struct acpi_fadt *)rsdt->entry[i];
524 if (strncmp((char *)fadt, "FACP", 4) == 0)
532 debug("FADT found at %p\n", fadt);
536 void *acpi_find_wakeup_vector(struct acpi_fadt *fadt)
538 struct acpi_facs *facs;
541 debug("Trying to find the wakeup vector...\n");
543 facs = (struct acpi_facs *)fadt->firmware_ctrl;
546 debug("No FACS found, wake up from S3 not possible.\n");
550 debug("FACS found at %p\n", facs);
551 wake_vec = (void *)facs->firmware_waking_vector;
552 debug("OS waking vector is %p\n", wake_vec);