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>
14 #include <asm/acpi/global_nvs.h>
15 #include <asm/acpi_table.h>
17 #include <asm/lapic.h>
18 #include <asm/tables.h>
19 #include <asm/arch/global_nvs.h>
22 * IASL compiles the dsdt entries and writes the hex values
23 * to a C array AmlCode[] (see dsdt.c).
25 extern const unsigned char AmlCode[];
27 static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
28 struct acpi_xsdt *xsdt)
30 memset(rsdp, 0, sizeof(struct acpi_rsdp));
32 memcpy(rsdp->signature, RSDP_SIG, 8);
33 memcpy(rsdp->oem_id, OEM_ID, 6);
35 rsdp->length = sizeof(struct acpi_rsdp);
36 rsdp->rsdt_address = (u32)rsdt;
39 * Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2
41 * Some OSes expect an XSDT to be present for RSD PTR revisions >= 2.
42 * If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR
46 rsdp->revision = ACPI_RSDP_REV_ACPI_1_0;
48 rsdp->xsdt_address = (u64)(u32)xsdt;
49 rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
52 /* Calculate checksums */
53 rsdp->checksum = table_compute_checksum((void *)rsdp, 20);
54 rsdp->ext_checksum = table_compute_checksum((void *)rsdp,
55 sizeof(struct acpi_rsdp));
58 void acpi_fill_header(struct acpi_table_header *header, char *signature)
60 memcpy(header->signature, signature, 4);
61 memcpy(header->oem_id, OEM_ID, 6);
62 memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
63 memcpy(header->aslc_id, ASLC_ID, 4);
66 static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
68 struct acpi_table_header *header = &(rsdt->header);
70 /* Fill out header fields */
71 acpi_fill_header(header, "RSDT");
72 header->length = sizeof(struct acpi_rsdt);
75 /* Entries are filled in later, we come with an empty set */
78 header->checksum = table_compute_checksum((void *)rsdt,
79 sizeof(struct acpi_rsdt));
82 static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
84 struct acpi_table_header *header = &(xsdt->header);
86 /* Fill out header fields */
87 acpi_fill_header(header, "XSDT");
88 header->length = sizeof(struct acpi_xsdt);
91 /* Entries are filled in later, we come with an empty set */
94 header->checksum = table_compute_checksum((void *)xsdt,
95 sizeof(struct acpi_xsdt));
99 * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
102 static void acpi_add_table(struct acpi_rsdp *rsdp, void *table)
105 struct acpi_rsdt *rsdt;
106 struct acpi_xsdt *xsdt = NULL;
108 /* The RSDT is mandatory while the XSDT is not */
109 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
111 if (rsdp->xsdt_address)
112 xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address);
114 /* This should always be MAX_ACPI_TABLES */
115 entries_num = ARRAY_SIZE(rsdt->entry);
117 for (i = 0; i < entries_num; i++) {
118 if (rsdt->entry[i] == 0)
122 if (i >= entries_num) {
123 debug("ACPI: Error: too many tables\n");
127 /* Add table to the RSDT */
128 rsdt->entry[i] = (u32)table;
130 /* Fix RSDT length or the kernel will assume invalid entries */
131 rsdt->header.length = sizeof(struct acpi_table_header) +
132 (sizeof(u32) * (i + 1));
134 /* Re-calculate checksum */
135 rsdt->header.checksum = 0;
136 rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
137 rsdt->header.length);
140 * And now the same thing for the XSDT. We use the same index as for
141 * now we want the XSDT and RSDT to always be in sync in U-Boot
144 /* Add table to the XSDT */
145 xsdt->entry[i] = (u64)(u32)table;
147 /* Fix XSDT length */
148 xsdt->header.length = sizeof(struct acpi_table_header) +
149 (sizeof(u64) * (i + 1));
151 /* Re-calculate checksum */
152 xsdt->header.checksum = 0;
153 xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
154 xsdt->header.length);
158 static void acpi_create_facs(struct acpi_facs *facs)
160 memset((void *)facs, 0, sizeof(struct acpi_facs));
162 memcpy(facs->signature, "FACS", 4);
163 facs->length = sizeof(struct acpi_facs);
164 facs->hardware_signature = 0;
165 facs->firmware_waking_vector = 0;
166 facs->global_lock = 0;
168 facs->x_firmware_waking_vector_l = 0;
169 facs->x_firmware_waking_vector_h = 0;
173 static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic,
176 lapic->type = ACPI_APIC_LAPIC;
177 lapic->length = sizeof(struct acpi_madt_lapic);
178 lapic->flags = LOCAL_APIC_FLAG_ENABLED;
179 lapic->processor_id = cpu;
180 lapic->apic_id = apic;
182 return lapic->length;
185 int acpi_create_madt_lapics(u32 current)
188 int total_length = 0;
190 for (uclass_find_first_device(UCLASS_CPU, &dev);
192 uclass_find_next_device(&dev)) {
193 struct cpu_platdata *plat = dev_get_parent_platdata(dev);
194 int length = acpi_create_madt_lapic(
195 (struct acpi_madt_lapic *)current,
196 plat->cpu_id, plat->cpu_id);
198 total_length += length;
204 int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id,
205 u32 addr, u32 gsi_base)
207 ioapic->type = ACPI_APIC_IOAPIC;
208 ioapic->length = sizeof(struct acpi_madt_ioapic);
209 ioapic->reserved = 0x00;
210 ioapic->gsi_base = gsi_base;
211 ioapic->ioapic_id = id;
212 ioapic->ioapic_addr = addr;
214 return ioapic->length;
217 int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride,
218 u8 bus, u8 source, u32 gsirq, u16 flags)
220 irqoverride->type = ACPI_APIC_IRQ_SRC_OVERRIDE;
221 irqoverride->length = sizeof(struct acpi_madt_irqoverride);
222 irqoverride->bus = bus;
223 irqoverride->source = source;
224 irqoverride->gsirq = gsirq;
225 irqoverride->flags = flags;
227 return irqoverride->length;
230 int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi,
231 u8 cpu, u16 flags, u8 lint)
233 lapic_nmi->type = ACPI_APIC_LAPIC_NMI;
234 lapic_nmi->length = sizeof(struct acpi_madt_lapic_nmi);
235 lapic_nmi->flags = flags;
236 lapic_nmi->processor_id = cpu;
237 lapic_nmi->lint = lint;
239 return lapic_nmi->length;
242 static void acpi_create_madt(struct acpi_madt *madt)
244 struct acpi_table_header *header = &(madt->header);
245 u32 current = (u32)madt + sizeof(struct acpi_madt);
247 memset((void *)madt, 0, sizeof(struct acpi_madt));
249 /* Fill out header fields */
250 acpi_fill_header(header, "APIC");
251 header->length = sizeof(struct acpi_madt);
252 header->revision = 4;
254 madt->lapic_addr = LAPIC_DEFAULT_BASE;
255 madt->flags = ACPI_MADT_PCAT_COMPAT;
257 current = acpi_fill_madt(current);
259 /* (Re)calculate length and checksum */
260 header->length = current - (u32)madt;
262 header->checksum = table_compute_checksum((void *)madt, header->length);
265 static int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig,
266 u32 base, u16 seg_nr, u8 start, u8 end)
268 memset(mmconfig, 0, sizeof(*mmconfig));
269 mmconfig->base_address_l = base;
270 mmconfig->base_address_h = 0;
271 mmconfig->pci_segment_group_number = seg_nr;
272 mmconfig->start_bus_number = start;
273 mmconfig->end_bus_number = end;
275 return sizeof(struct acpi_mcfg_mmconfig);
278 static u32 acpi_fill_mcfg(u32 current)
280 current += acpi_create_mcfg_mmconfig
281 ((struct acpi_mcfg_mmconfig *)current,
282 CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255);
287 /* MCFG is defined in the PCI Firmware Specification 3.0 */
288 static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
290 struct acpi_table_header *header = &(mcfg->header);
291 u32 current = (u32)mcfg + sizeof(struct acpi_mcfg);
293 memset((void *)mcfg, 0, sizeof(struct acpi_mcfg));
295 /* Fill out header fields */
296 acpi_fill_header(header, "MCFG");
297 header->length = sizeof(struct acpi_mcfg);
298 header->revision = 1;
300 current = acpi_fill_mcfg(current);
302 /* (Re)calculate length and checksum */
303 header->length = current - (u32)mcfg;
304 header->checksum = table_compute_checksum((void *)mcfg, header->length);
307 void enter_acpi_mode(int pm1_cnt)
309 u16 val = inw(pm1_cnt);
312 * PM1_CNT register bit0 selects the power management event to be
313 * either an SCI or SMI interrupt. When this bit is set, then power
314 * management events will generate an SCI interrupt. When this bit
315 * is reset power management events will generate an SMI interrupt.
317 * Per ACPI spec, it is the responsibility of the hardware to set
318 * or reset this bit. OSPM always preserves this bit position.
320 * U-Boot does not support SMI. And we don't have plan to support
321 * anything running in SMM within U-Boot. To create a legacy-free
322 * system, and expose ourselves to OSPM as working under ACPI mode
323 * already, turn this bit on.
325 outw(val | PM1_CNT_SCI_EN, pm1_cnt);
329 * QEMU's version of write_acpi_tables is defined in
330 * arch/x86/cpu/qemu/acpi_table.c
332 ulong write_acpi_tables(ulong start)
335 struct acpi_rsdp *rsdp;
336 struct acpi_rsdt *rsdt;
337 struct acpi_xsdt *xsdt;
338 struct acpi_facs *facs;
339 struct acpi_table_header *dsdt;
340 struct acpi_fadt *fadt;
341 struct acpi_mcfg *mcfg;
342 struct acpi_madt *madt;
347 /* Align ACPI tables to 16 byte */
348 current = ALIGN(current, 16);
350 debug("ACPI: Writing ACPI tables at %lx\n", start);
352 /* We need at least an RSDP and an RSDT Table */
353 rsdp = (struct acpi_rsdp *)current;
354 current += sizeof(struct acpi_rsdp);
355 current = ALIGN(current, 16);
356 rsdt = (struct acpi_rsdt *)current;
357 current += sizeof(struct acpi_rsdt);
358 current = ALIGN(current, 16);
359 xsdt = (struct acpi_xsdt *)current;
360 current += sizeof(struct acpi_xsdt);
362 * Per ACPI spec, the FACS table address must be aligned to a 64 byte
363 * boundary (Windows checks this, but Linux does not).
365 current = ALIGN(current, 64);
367 /* clear all table memory */
368 memset((void *)start, 0, current - start);
370 acpi_write_rsdp(rsdp, rsdt, xsdt);
371 acpi_write_rsdt(rsdt);
372 acpi_write_xsdt(xsdt);
374 debug("ACPI: * FACS\n");
375 facs = (struct acpi_facs *)current;
376 current += sizeof(struct acpi_facs);
377 current = ALIGN(current, 16);
379 acpi_create_facs(facs);
381 debug("ACPI: * DSDT\n");
382 dsdt = (struct acpi_table_header *)current;
383 memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header));
384 current += sizeof(struct acpi_table_header);
385 memcpy((char *)current,
386 (char *)&AmlCode + sizeof(struct acpi_table_header),
387 dsdt->length - sizeof(struct acpi_table_header));
388 current += dsdt->length - sizeof(struct acpi_table_header);
389 current = ALIGN(current, 16);
391 /* Pack GNVS into the ACPI table area */
392 for (i = 0; i < dsdt->length; i++) {
393 u32 *gnvs = (u32 *)((u32)dsdt + i);
394 if (*gnvs == ACPI_GNVS_ADDR) {
395 debug("Fix up global NVS in DSDT to 0x%08x\n", current);
401 /* Update DSDT checksum since we patched the GNVS address */
403 dsdt->checksum = table_compute_checksum((void *)dsdt, dsdt->length);
405 /* Fill in platform-specific global NVS variables */
406 acpi_create_gnvs((struct acpi_global_nvs *)current);
407 current += sizeof(struct acpi_global_nvs);
408 current = ALIGN(current, 16);
410 debug("ACPI: * FADT\n");
411 fadt = (struct acpi_fadt *)current;
412 current += sizeof(struct acpi_fadt);
413 current = ALIGN(current, 16);
414 acpi_create_fadt(fadt, facs, dsdt);
415 acpi_add_table(rsdp, fadt);
417 debug("ACPI: * MADT\n");
418 madt = (struct acpi_madt *)current;
419 acpi_create_madt(madt);
420 current += madt->header.length;
421 acpi_add_table(rsdp, madt);
422 current = ALIGN(current, 16);
424 debug("ACPI: * MCFG\n");
425 mcfg = (struct acpi_mcfg *)current;
426 acpi_create_mcfg(mcfg);
427 current += mcfg->header.length;
428 acpi_add_table(rsdp, mcfg);
429 current = ALIGN(current, 16);
431 debug("current = %x\n", current);
433 debug("ACPI: done\n");
436 * Other than waiting for OSPM to request us to switch to ACPI mode,
437 * do it by ourselves, since SMI will not be triggered.
439 enter_acpi_mode(fadt->pm1a_cnt_blk);
444 static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp)
446 if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
449 debug("Looking on %p for valid checksum\n", rsdp);
451 if (table_compute_checksum((void *)rsdp, 20) != 0)
453 debug("acpi rsdp checksum 1 passed\n");
455 if ((rsdp->revision > 1) &&
456 (table_compute_checksum((void *)rsdp, rsdp->length) != 0))
458 debug("acpi rsdp checksum 2 passed\n");
463 struct acpi_fadt *acpi_find_fadt(void)
466 struct acpi_rsdp *rsdp = NULL;
467 struct acpi_rsdt *rsdt;
468 struct acpi_fadt *fadt = NULL;
472 for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) {
473 rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p);
481 debug("RSDP found at %p\n", rsdp);
482 rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
484 end = (char *)rsdt + rsdt->header.length;
485 debug("RSDT found at %p ends at %p\n", rsdt, end);
487 for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) {
488 fadt = (struct acpi_fadt *)rsdt->entry[i];
489 if (strncmp((char *)fadt, "FACP", 4) == 0)
497 debug("FADT found at %p\n", fadt);
501 void *acpi_find_wakeup_vector(struct acpi_fadt *fadt)
503 struct acpi_facs *facs;
506 debug("Trying to find the wakeup vector...\n");
508 facs = (struct acpi_facs *)fadt->firmware_ctrl;
511 debug("No FACS found, wake up from S3 not possible.\n");
515 debug("FACS found at %p\n", facs);
516 wake_vec = (void *)facs->firmware_waking_vector;
517 debug("OS waking vector is %p\n", wake_vec);