u-boot/arch/x86/lib/acpi_table.c
Andy Shevchenko 382fabb297 x86: acpi: Don't touch hardware on HW reduced platforms
If ACPI HW reduced bit in FADT is set we should ignore any ACPI hardware
communications.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2017-07-30 10:30:25 +08:00

555 lines
14 KiB
C

/*
* Based on acpi.c from coreboot
*
* Copyright (C) 2015, Saket Sinha <saket.sinha89@gmail.com>
* Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <cpu.h>
#include <dm.h>
#include <dm/uclass-internal.h>
#include <version.h>
#include <asm/acpi/global_nvs.h>
#include <asm/acpi_table.h>
#include <asm/io.h>
#include <asm/ioapic.h>
#include <asm/lapic.h>
#include <asm/mpspec.h>
#include <asm/tables.h>
#include <asm/arch/global_nvs.h>
/*
* IASL compiles the dsdt entries and writes the hex values
* to a C array AmlCode[] (see dsdt.c).
*/
extern const unsigned char AmlCode[];
static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
struct acpi_xsdt *xsdt)
{
memset(rsdp, 0, sizeof(struct acpi_rsdp));
memcpy(rsdp->signature, RSDP_SIG, 8);
memcpy(rsdp->oem_id, OEM_ID, 6);
rsdp->length = sizeof(struct acpi_rsdp);
rsdp->rsdt_address = (u32)rsdt;
/*
* Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2
*
* Some OSes expect an XSDT to be present for RSD PTR revisions >= 2.
* If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR
* revision 0)
*/
if (xsdt == NULL) {
rsdp->revision = ACPI_RSDP_REV_ACPI_1_0;
} else {
rsdp->xsdt_address = (u64)(u32)xsdt;
rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
}
/* Calculate checksums */
rsdp->checksum = table_compute_checksum((void *)rsdp, 20);
rsdp->ext_checksum = table_compute_checksum((void *)rsdp,
sizeof(struct acpi_rsdp));
}
void acpi_fill_header(struct acpi_table_header *header, char *signature)
{
memcpy(header->signature, signature, 4);
memcpy(header->oem_id, OEM_ID, 6);
memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
header->oem_revision = U_BOOT_BUILD_DATE;
memcpy(header->aslc_id, ASLC_ID, 4);
}
static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
{
struct acpi_table_header *header = &(rsdt->header);
/* Fill out header fields */
acpi_fill_header(header, "RSDT");
header->length = sizeof(struct acpi_rsdt);
header->revision = 1;
/* Entries are filled in later, we come with an empty set */
/* Fix checksum */
header->checksum = table_compute_checksum((void *)rsdt,
sizeof(struct acpi_rsdt));
}
static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
{
struct acpi_table_header *header = &(xsdt->header);
/* Fill out header fields */
acpi_fill_header(header, "XSDT");
header->length = sizeof(struct acpi_xsdt);
header->revision = 1;
/* Entries are filled in later, we come with an empty set */
/* Fix checksum */
header->checksum = table_compute_checksum((void *)xsdt,
sizeof(struct acpi_xsdt));
}
/**
* Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
* and checksum.
*/
static void acpi_add_table(struct acpi_rsdp *rsdp, void *table)
{
int i, entries_num;
struct acpi_rsdt *rsdt;
struct acpi_xsdt *xsdt = NULL;
/* The RSDT is mandatory while the XSDT is not */
rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
if (rsdp->xsdt_address)
xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address);
/* This should always be MAX_ACPI_TABLES */
entries_num = ARRAY_SIZE(rsdt->entry);
for (i = 0; i < entries_num; i++) {
if (rsdt->entry[i] == 0)
break;
}
if (i >= entries_num) {
debug("ACPI: Error: too many tables\n");
return;
}
/* Add table to the RSDT */
rsdt->entry[i] = (u32)table;
/* Fix RSDT length or the kernel will assume invalid entries */
rsdt->header.length = sizeof(struct acpi_table_header) +
(sizeof(u32) * (i + 1));
/* Re-calculate checksum */
rsdt->header.checksum = 0;
rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
rsdt->header.length);
/*
* And now the same thing for the XSDT. We use the same index as for
* now we want the XSDT and RSDT to always be in sync in U-Boot
*/
if (xsdt) {
/* Add table to the XSDT */
xsdt->entry[i] = (u64)(u32)table;
/* Fix XSDT length */
xsdt->header.length = sizeof(struct acpi_table_header) +
(sizeof(u64) * (i + 1));
/* Re-calculate checksum */
xsdt->header.checksum = 0;
xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
xsdt->header.length);
}
}
static void acpi_create_facs(struct acpi_facs *facs)
{
memset((void *)facs, 0, sizeof(struct acpi_facs));
memcpy(facs->signature, "FACS", 4);
facs->length = sizeof(struct acpi_facs);
facs->hardware_signature = 0;
facs->firmware_waking_vector = 0;
facs->global_lock = 0;
facs->flags = 0;
facs->x_firmware_waking_vector_l = 0;
facs->x_firmware_waking_vector_h = 0;
facs->version = 1;
}
static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic,
u8 cpu, u8 apic)
{
lapic->type = ACPI_APIC_LAPIC;
lapic->length = sizeof(struct acpi_madt_lapic);
lapic->flags = LOCAL_APIC_FLAG_ENABLED;
lapic->processor_id = cpu;
lapic->apic_id = apic;
return lapic->length;
}
int acpi_create_madt_lapics(u32 current)
{
struct udevice *dev;
int total_length = 0;
for (uclass_find_first_device(UCLASS_CPU, &dev);
dev;
uclass_find_next_device(&dev)) {
struct cpu_platdata *plat = dev_get_parent_platdata(dev);
int length = acpi_create_madt_lapic(
(struct acpi_madt_lapic *)current,
plat->cpu_id, plat->cpu_id);
current += length;
total_length += length;
}
return total_length;
}
int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id,
u32 addr, u32 gsi_base)
{
ioapic->type = ACPI_APIC_IOAPIC;
ioapic->length = sizeof(struct acpi_madt_ioapic);
ioapic->reserved = 0x00;
ioapic->gsi_base = gsi_base;
ioapic->ioapic_id = id;
ioapic->ioapic_addr = addr;
return ioapic->length;
}
int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride,
u8 bus, u8 source, u32 gsirq, u16 flags)
{
irqoverride->type = ACPI_APIC_IRQ_SRC_OVERRIDE;
irqoverride->length = sizeof(struct acpi_madt_irqoverride);
irqoverride->bus = bus;
irqoverride->source = source;
irqoverride->gsirq = gsirq;
irqoverride->flags = flags;
return irqoverride->length;
}
int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi,
u8 cpu, u16 flags, u8 lint)
{
lapic_nmi->type = ACPI_APIC_LAPIC_NMI;
lapic_nmi->length = sizeof(struct acpi_madt_lapic_nmi);
lapic_nmi->flags = flags;
lapic_nmi->processor_id = cpu;
lapic_nmi->lint = lint;
return lapic_nmi->length;
}
static int acpi_create_madt_irq_overrides(u32 current)
{
struct acpi_madt_irqoverride *irqovr;
u16 sci_flags = MP_IRQ_TRIGGER_LEVEL | MP_IRQ_POLARITY_HIGH;
int length = 0;
irqovr = (void *)current;
length += acpi_create_madt_irqoverride(irqovr, 0, 0, 2, 0);
irqovr = (void *)(current + length);
length += acpi_create_madt_irqoverride(irqovr, 0, 9, 9, sci_flags);
return length;
}
__weak u32 acpi_fill_madt(u32 current)
{
current += acpi_create_madt_lapics(current);
current += acpi_create_madt_ioapic((struct acpi_madt_ioapic *)current,
io_apic_read(IO_APIC_ID) >> 24, IO_APIC_ADDR, 0);
current += acpi_create_madt_irq_overrides(current);
return current;
}
static void acpi_create_madt(struct acpi_madt *madt)
{
struct acpi_table_header *header = &(madt->header);
u32 current = (u32)madt + sizeof(struct acpi_madt);
memset((void *)madt, 0, sizeof(struct acpi_madt));
/* Fill out header fields */
acpi_fill_header(header, "APIC");
header->length = sizeof(struct acpi_madt);
header->revision = 4;
madt->lapic_addr = LAPIC_DEFAULT_BASE;
madt->flags = ACPI_MADT_PCAT_COMPAT;
current = acpi_fill_madt(current);
/* (Re)calculate length and checksum */
header->length = current - (u32)madt;
header->checksum = table_compute_checksum((void *)madt, header->length);
}
int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
u16 seg_nr, u8 start, u8 end)
{
memset(mmconfig, 0, sizeof(*mmconfig));
mmconfig->base_address_l = base;
mmconfig->base_address_h = 0;
mmconfig->pci_segment_group_number = seg_nr;
mmconfig->start_bus_number = start;
mmconfig->end_bus_number = end;
return sizeof(struct acpi_mcfg_mmconfig);
}
__weak u32 acpi_fill_mcfg(u32 current)
{
current += acpi_create_mcfg_mmconfig
((struct acpi_mcfg_mmconfig *)current,
CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255);
return current;
}
/* MCFG is defined in the PCI Firmware Specification 3.0 */
static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
{
struct acpi_table_header *header = &(mcfg->header);
u32 current = (u32)mcfg + sizeof(struct acpi_mcfg);
memset((void *)mcfg, 0, sizeof(struct acpi_mcfg));
/* Fill out header fields */
acpi_fill_header(header, "MCFG");
header->length = sizeof(struct acpi_mcfg);
header->revision = 1;
current = acpi_fill_mcfg(current);
/* (Re)calculate length and checksum */
header->length = current - (u32)mcfg;
header->checksum = table_compute_checksum((void *)mcfg, header->length);
}
void enter_acpi_mode(int pm1_cnt)
{
u16 val = inw(pm1_cnt);
/*
* PM1_CNT register bit0 selects the power management event to be
* either an SCI or SMI interrupt. When this bit is set, then power
* management events will generate an SCI interrupt. When this bit
* is reset power management events will generate an SMI interrupt.
*
* Per ACPI spec, it is the responsibility of the hardware to set
* or reset this bit. OSPM always preserves this bit position.
*
* U-Boot does not support SMI. And we don't have plan to support
* anything running in SMM within U-Boot. To create a legacy-free
* system, and expose ourselves to OSPM as working under ACPI mode
* already, turn this bit on.
*/
outw(val | PM1_CNT_SCI_EN, pm1_cnt);
}
/*
* QEMU's version of write_acpi_tables is defined in
* arch/x86/cpu/qemu/acpi_table.c
*/
ulong write_acpi_tables(ulong start)
{
u32 current;
struct acpi_rsdp *rsdp;
struct acpi_rsdt *rsdt;
struct acpi_xsdt *xsdt;
struct acpi_facs *facs;
struct acpi_table_header *dsdt;
struct acpi_fadt *fadt;
struct acpi_mcfg *mcfg;
struct acpi_madt *madt;
int i;
current = start;
/* Align ACPI tables to 16 byte */
current = ALIGN(current, 16);
debug("ACPI: Writing ACPI tables at %lx\n", start);
/* We need at least an RSDP and an RSDT Table */
rsdp = (struct acpi_rsdp *)current;
current += sizeof(struct acpi_rsdp);
current = ALIGN(current, 16);
rsdt = (struct acpi_rsdt *)current;
current += sizeof(struct acpi_rsdt);
current = ALIGN(current, 16);
xsdt = (struct acpi_xsdt *)current;
current += sizeof(struct acpi_xsdt);
/*
* Per ACPI spec, the FACS table address must be aligned to a 64 byte
* boundary (Windows checks this, but Linux does not).
*/
current = ALIGN(current, 64);
/* clear all table memory */
memset((void *)start, 0, current - start);
acpi_write_rsdp(rsdp, rsdt, xsdt);
acpi_write_rsdt(rsdt);
acpi_write_xsdt(xsdt);
debug("ACPI: * FACS\n");
facs = (struct acpi_facs *)current;
current += sizeof(struct acpi_facs);
current = ALIGN(current, 16);
acpi_create_facs(facs);
debug("ACPI: * DSDT\n");
dsdt = (struct acpi_table_header *)current;
memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header));
current += sizeof(struct acpi_table_header);
memcpy((char *)current,
(char *)&AmlCode + sizeof(struct acpi_table_header),
dsdt->length - sizeof(struct acpi_table_header));
current += dsdt->length - sizeof(struct acpi_table_header);
current = ALIGN(current, 16);
/* Pack GNVS into the ACPI table area */
for (i = 0; i < dsdt->length; i++) {
u32 *gnvs = (u32 *)((u32)dsdt + i);
if (*gnvs == ACPI_GNVS_ADDR) {
debug("Fix up global NVS in DSDT to 0x%08x\n", current);
*gnvs = current;
break;
}
}
/* Update DSDT checksum since we patched the GNVS address */
dsdt->checksum = 0;
dsdt->checksum = table_compute_checksum((void *)dsdt, dsdt->length);
/* Fill in platform-specific global NVS variables */
acpi_create_gnvs((struct acpi_global_nvs *)current);
current += sizeof(struct acpi_global_nvs);
current = ALIGN(current, 16);
debug("ACPI: * FADT\n");
fadt = (struct acpi_fadt *)current;
current += sizeof(struct acpi_fadt);
current = ALIGN(current, 16);
acpi_create_fadt(fadt, facs, dsdt);
acpi_add_table(rsdp, fadt);
debug("ACPI: * MADT\n");
madt = (struct acpi_madt *)current;
acpi_create_madt(madt);
current += madt->header.length;
acpi_add_table(rsdp, madt);
current = ALIGN(current, 16);
debug("ACPI: * MCFG\n");
mcfg = (struct acpi_mcfg *)current;
acpi_create_mcfg(mcfg);
current += mcfg->header.length;
acpi_add_table(rsdp, mcfg);
current = ALIGN(current, 16);
debug("current = %x\n", current);
debug("ACPI: done\n");
/* Don't touch ACPI hardware on HW reduced platforms */
if (fadt->flags & ACPI_FADT_HW_REDUCED_ACPI)
return current;
/*
* Other than waiting for OSPM to request us to switch to ACPI mode,
* do it by ourselves, since SMI will not be triggered.
*/
enter_acpi_mode(fadt->pm1a_cnt_blk);
return current;
}
static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp)
{
if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
return NULL;
debug("Looking on %p for valid checksum\n", rsdp);
if (table_compute_checksum((void *)rsdp, 20) != 0)
return NULL;
debug("acpi rsdp checksum 1 passed\n");
if ((rsdp->revision > 1) &&
(table_compute_checksum((void *)rsdp, rsdp->length) != 0))
return NULL;
debug("acpi rsdp checksum 2 passed\n");
return rsdp;
}
struct acpi_fadt *acpi_find_fadt(void)
{
char *p, *end;
struct acpi_rsdp *rsdp = NULL;
struct acpi_rsdt *rsdt;
struct acpi_fadt *fadt = NULL;
int i;
/* Find RSDP */
for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) {
rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p);
if (rsdp)
break;
}
if (rsdp == NULL)
return NULL;
debug("RSDP found at %p\n", rsdp);
rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
end = (char *)rsdt + rsdt->header.length;
debug("RSDT found at %p ends at %p\n", rsdt, end);
for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) {
fadt = (struct acpi_fadt *)rsdt->entry[i];
if (strncmp((char *)fadt, "FACP", 4) == 0)
break;
fadt = NULL;
}
if (fadt == NULL)
return NULL;
debug("FADT found at %p\n", fadt);
return fadt;
}
void *acpi_find_wakeup_vector(struct acpi_fadt *fadt)
{
struct acpi_facs *facs;
void *wake_vec;
debug("Trying to find the wakeup vector...\n");
facs = (struct acpi_facs *)fadt->firmware_ctrl;
if (facs == NULL) {
debug("No FACS found, wake up from S3 not possible.\n");
return NULL;
}
debug("FACS found at %p\n", facs);
wake_vec = (void *)facs->firmware_waking_vector;
debug("OS waking vector is %p\n", wake_vec);
return wake_vec;
}