// SPDX-License-Identifier: GPL-2.0+
/*
 * Based on acpi.c from coreboot
 *
 * Copyright (C) 2015, Saket Sinha <saket.sinha89@gmail.com>
 * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
 */

#define LOG_CATEGORY LOGC_ACPI

#include <common.h>
#include <bloblist.h>
#include <cpu.h>
#include <dm.h>
#include <log.h>
#include <dm/uclass-internal.h>
#include <mapmem.h>
#include <serial.h>
#include <version.h>
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <acpi/acpi_table.h>
#include <asm/acpi/global_nvs.h>
#include <asm/ioapic.h>
#include <asm/lapic.h>
#include <asm/mpspec.h>
#include <asm/tables.h>
#include <asm/arch/global_nvs.h>
#include <dm/acpi.h>
#include <linux/err.h>

/*
 * IASL compiles the dsdt entries and writes the hex values
 * to a C array AmlCode[] (see dsdt.c).
 */
extern const unsigned char AmlCode[];

/* ACPI RSDP address to be used in boot parameters */
static ulong acpi_rsdp_addr;

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;
        int cpu_num = 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;

                length = acpi_create_madt_lapic(
                        (struct acpi_madt_lapic *)current, cpu_num++,
                        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 = ACPI_MADT_REV_ACPI_3_0;

        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);
}

/**
 * acpi_create_tcpa() - Create a TCPA table
 *
 * @tcpa: Pointer to place to put table
 *
 * Trusted Computing Platform Alliance Capabilities Table
 * TCPA PC Specific Implementation SpecificationTCPA is defined in the PCI
 * Firmware Specification 3.0
 */
static int acpi_create_tcpa(struct acpi_tcpa *tcpa)
{
        struct acpi_table_header *header = &tcpa->header;
        u32 current = (u32)tcpa + sizeof(struct acpi_tcpa);
        int size = 0x10000;     /* Use this as the default size */
        void *log;
        int ret;

        if (!CONFIG_IS_ENABLED(BLOBLIST))
                return -ENXIO;
        memset(tcpa, '\0', sizeof(struct acpi_tcpa));

        /* Fill out header fields */
        acpi_fill_header(header, "TCPA");
        header->length = sizeof(struct acpi_tcpa);
        header->revision = 1;

        ret = bloblist_ensure_size_ret(BLOBLISTT_TCPA_LOG, &size, &log);
        if (ret)
                return log_msg_ret("blob", ret);

        tcpa->platform_class = 0;
        tcpa->laml = size;
        tcpa->lasa = (ulong)log;

        /* (Re)calculate length and checksum */
        header->length = current - (u32)tcpa;
        header->checksum = table_compute_checksum((void *)tcpa, header->length);

        return 0;
}

static int get_tpm2_log(void **ptrp, int *sizep)
{
        const int tpm2_default_log_len = 0x10000;
        int size;
        int ret;

        *sizep = 0;
        size = tpm2_default_log_len;
        ret = bloblist_ensure_size_ret(BLOBLISTT_TPM2_TCG_LOG, &size, ptrp);
        if (ret)
                return log_msg_ret("blob", ret);
        *sizep = size;

        return 0;
}

static int acpi_create_tpm2(struct acpi_tpm2 *tpm2)
{
        struct acpi_table_header *header = &tpm2->header;
        int tpm2_log_len;
        void *lasa;
        int ret;

        memset((void *)tpm2, 0, sizeof(struct acpi_tpm2));

        /*
         * Some payloads like SeaBIOS depend on log area to use TPM2.
         * Get the memory size and address of TPM2 log area or initialize it.
         */
        ret = get_tpm2_log(&lasa, &tpm2_log_len);
        if (ret)
                return ret;

        /* Fill out header fields. */
        acpi_fill_header(header, "TPM2");
        memcpy(header->aslc_id, ASLC_ID, 4);

        header->length = sizeof(struct acpi_tpm2);
        header->revision = acpi_get_table_revision(ACPITAB_TPM2);

        /* Hard to detect for coreboot. Just set it to 0 */
        tpm2->platform_class = 0;

        /* Must be set to 0 for FIFO-interface support */
        tpm2->control_area = 0;
        tpm2->start_method = 6;
        memset(tpm2->msp, 0, sizeof(tpm2->msp));

        /* Fill the log area size and start address fields. */
        tpm2->laml = tpm2_log_len;
        tpm2->lasa = (uintptr_t)lasa;

        /* Calculate checksum. */
        header->checksum = table_compute_checksum((void *)tpm2, header->length);

        return 0;
}

__weak u32 acpi_fill_csrt(u32 current)
{
        return 0;
}

static int acpi_create_csrt(struct acpi_csrt *csrt)
{
        struct acpi_table_header *header = &(csrt->header);
        u32 current = (u32)csrt + sizeof(struct acpi_csrt);
        uint ptr;

        memset((void *)csrt, 0, sizeof(struct acpi_csrt));

        /* Fill out header fields */
        acpi_fill_header(header, "CSRT");
        header->length = sizeof(struct acpi_csrt);
        header->revision = 0;

        ptr = acpi_fill_csrt(current);
        if (!ptr)
                return -ENOENT;
        current = ptr;

        /* (Re)calculate length and checksum */
        header->length = current - (u32)csrt;
        header->checksum = table_compute_checksum((void *)csrt, header->length);

        return 0;
}

static void acpi_create_spcr(struct acpi_spcr *spcr)
{
        struct acpi_table_header *header = &(spcr->header);
        struct serial_device_info serial_info = {0};
        ulong serial_address, serial_offset;
        struct udevice *dev;
        uint serial_config;
        uint serial_width;
        int access_size;
        int space_id;
        int ret = -ENODEV;

        memset((void *)spcr, 0, sizeof(struct acpi_spcr));

        /* Fill out header fields */
        acpi_fill_header(header, "SPCR");
        header->length = sizeof(struct acpi_spcr);
        header->revision = 2;

        /* Read the device once, here. It is reused below */
        dev = gd->cur_serial_dev;
        if (dev)
                ret = serial_getinfo(dev, &serial_info);
        if (ret)
                serial_info.type = SERIAL_CHIP_UNKNOWN;

        /* Encode chip type */
        switch (serial_info.type) {
        case SERIAL_CHIP_16550_COMPATIBLE:
                spcr->interface_type = ACPI_DBG2_16550_COMPATIBLE;
                break;
        case SERIAL_CHIP_UNKNOWN:
        default:
                spcr->interface_type = ACPI_DBG2_UNKNOWN;
                break;
        }

        /* Encode address space */
        switch (serial_info.addr_space) {
        case SERIAL_ADDRESS_SPACE_MEMORY:
                space_id = ACPI_ADDRESS_SPACE_MEMORY;
                break;
        case SERIAL_ADDRESS_SPACE_IO:
        default:
                space_id = ACPI_ADDRESS_SPACE_IO;
                break;
        }

        serial_width = serial_info.reg_width * 8;
        serial_offset = serial_info.reg_offset << serial_info.reg_shift;
        serial_address = serial_info.addr + serial_offset;

        /* Encode register access size */
        switch (serial_info.reg_shift) {
        case 0:
                access_size = ACPI_ACCESS_SIZE_BYTE_ACCESS;
                break;
        case 1:
                access_size = ACPI_ACCESS_SIZE_WORD_ACCESS;
                break;
        case 2:
                access_size = ACPI_ACCESS_SIZE_DWORD_ACCESS;
                break;
        case 3:
                access_size = ACPI_ACCESS_SIZE_QWORD_ACCESS;
                break;
        default:
                access_size = ACPI_ACCESS_SIZE_UNDEFINED;
                break;
        }

        debug("UART type %u @ %lx\n", spcr->interface_type, serial_address);

        /* Fill GAS */
        spcr->serial_port.space_id = space_id;
        spcr->serial_port.bit_width = serial_width;
        spcr->serial_port.bit_offset = 0;
        spcr->serial_port.access_size = access_size;
        spcr->serial_port.addrl = lower_32_bits(serial_address);
        spcr->serial_port.addrh = upper_32_bits(serial_address);

        /* Encode baud rate */
        switch (serial_info.baudrate) {
        case 9600:
                spcr->baud_rate = 3;
                break;
        case 19200:
                spcr->baud_rate = 4;
                break;
        case 57600:
                spcr->baud_rate = 6;
                break;
        case 115200:
                spcr->baud_rate = 7;
                break;
        default:
                spcr->baud_rate = 0;
                break;
        }

        serial_config = SERIAL_DEFAULT_CONFIG;
        if (dev)
                ret = serial_getconfig(dev, &serial_config);

        spcr->parity = SERIAL_GET_PARITY(serial_config);
        spcr->stop_bits = SERIAL_GET_STOP(serial_config);

        /* No PCI devices for now */
        spcr->pci_device_id = 0xffff;
        spcr->pci_vendor_id = 0xffff;

        /*
         * SPCR has no clue if the UART base clock speed is different
         * to the default one. However, the SPCR 1.04 defines baud rate
         * 0 as a preconfigured state of UART and OS is supposed not
         * to touch the configuration of the serial device.
         */
        if (serial_info.clock != SERIAL_DEFAULT_CLOCK)
                spcr->baud_rate = 0;

        /* Fix checksum */
        header->checksum = table_compute_checksum((void *)spcr, header->length);
}

static int acpi_create_ssdt(struct acpi_ctx *ctx,
                            struct acpi_table_header *ssdt,
                            const char *oem_table_id)
{
        memset((void *)ssdt, '\0', sizeof(struct acpi_table_header));

        acpi_fill_header(ssdt, "SSDT");
        ssdt->revision = acpi_get_table_revision(ACPITAB_SSDT);
        ssdt->aslc_revision = 1;
        ssdt->length = sizeof(struct acpi_table_header);

        acpi_inc(ctx, sizeof(struct acpi_table_header));

        acpi_fill_ssdt(ctx);

        /* (Re)calculate length and checksum */
        ssdt->length = ctx->current - (void *)ssdt;
        ssdt->checksum = table_compute_checksum((void *)ssdt, ssdt->length);
        log_debug("SSDT at %p, length %x\n", ssdt, ssdt->length);

        /* Drop the table if it is empty */
        if (ssdt->length == sizeof(struct acpi_table_header)) {
                ctx->current = ssdt;
                return -ENOENT;
        }
        acpi_align(ctx);

        return 0;
}

/*
 * QEMU's version of write_acpi_tables is defined in drivers/misc/qfw.c
 */
ulong write_acpi_tables(ulong start_addr)
{
        const int thl = sizeof(struct acpi_table_header);
        struct acpi_ctx *ctx;
        struct acpi_facs *facs;
        struct acpi_table_header *dsdt;
        struct acpi_fadt *fadt;
        struct acpi_table_header *ssdt;
        struct acpi_mcfg *mcfg;
        struct acpi_tcpa *tcpa;
        struct acpi_madt *madt;
        struct acpi_csrt *csrt;
        struct acpi_spcr *spcr;
        void *start;
        int aml_len;
        ulong addr;
        int ret;
        int i;

        ctx = calloc(1, sizeof(*ctx));
        if (!ctx)
                return log_msg_ret("mem", -ENOMEM);
        gd->acpi_ctx = ctx;

        start = map_sysmem(start_addr, 0);

        debug("ACPI: Writing ACPI tables at %lx\n", start_addr);

        acpi_reset_items();
        acpi_setup_base_tables(ctx, start);

        debug("ACPI:    * FACS\n");
        facs = ctx->current;
        acpi_inc_align(ctx, sizeof(struct acpi_facs));

        acpi_create_facs(facs);

        debug("ACPI:    * DSDT\n");
        dsdt = ctx->current;

        /* Put the table header first */
        memcpy(dsdt, &AmlCode, thl);
        acpi_inc(ctx, thl);
        log_debug("DSDT starts at %p, hdr ends at %p\n", dsdt, ctx->current);

        /* If the table is not empty, allow devices to inject things */
        aml_len = dsdt->length - thl;
        if (aml_len) {
                void *base = ctx->current;

                acpi_inject_dsdt(ctx);
                log_debug("Added %x bytes from inject_dsdt, now at %p\n",
                          ctx->current - base, ctx->current);
                log_debug("Copy AML code size %x to %p\n", aml_len,
                          ctx->current);
                memcpy(ctx->current, AmlCode + thl, aml_len);
                acpi_inc(ctx, aml_len);
        }

        dsdt->length = ctx->current - (void *)dsdt;
        acpi_align(ctx);
        log_debug("Updated DSDT length to %x, total %x\n", dsdt->length,
                  ctx->current - (void *)dsdt);

        if (!IS_ENABLED(CONFIG_ACPI_GNVS_EXTERNAL)) {
                /* 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) {
                                *gnvs = map_to_sysmem(ctx->current);
                                debug("Fix up global NVS in DSDT to %#08x\n",
                                      *gnvs);
                                break;
                        }
                }

                /*
                 * Fill in platform-specific global NVS variables. If this fails
                 * we cannot return the error but this should only happen while
                 * debugging.
                 */
                addr = acpi_create_gnvs(ctx->current);
                if (IS_ERR_VALUE(addr))
                        printf("Error: Gailed to create GNVS\n");
                acpi_inc_align(ctx, sizeof(struct acpi_global_nvs));
        }

        /*
         * Recalculate the length and update the DSDT checksum since we patched
         * the GNVS address. Set the checksum to zero since it is part of the
         * region being checksummed.
         */
        dsdt->checksum = 0;
        dsdt->checksum = table_compute_checksum((void *)dsdt, dsdt->length);

        /*
         * Fill in platform-specific global NVS variables. If this fails we
         * cannot return the error but this should only happen while debugging.
         */
        addr = acpi_create_gnvs(ctx->current);
        if (IS_ERR_VALUE(addr))
                printf("Error: Failed to create GNVS\n");

        acpi_inc_align(ctx, sizeof(struct acpi_global_nvs));

        debug("ACPI:    * FADT\n");
        fadt = ctx->current;
        acpi_inc_align(ctx, sizeof(struct acpi_fadt));
        acpi_create_fadt(fadt, facs, dsdt);
        acpi_add_table(ctx, fadt);

        debug("ACPI:     * SSDT\n");
        ssdt = (struct acpi_table_header *)ctx->current;
        if (!acpi_create_ssdt(ctx, ssdt, OEM_TABLE_ID))
                acpi_add_table(ctx, ssdt);

        debug("ACPI:    * MCFG\n");
        mcfg = ctx->current;
        acpi_create_mcfg(mcfg);
        acpi_inc_align(ctx, mcfg->header.length);
        acpi_add_table(ctx, mcfg);

        if (IS_ENABLED(CONFIG_TPM_V2)) {
                struct acpi_tpm2 *tpm2;

                debug("ACPI:    * TPM2\n");
                tpm2 = (struct acpi_tpm2 *)ctx->current;
                ret = acpi_create_tpm2(tpm2);
                if (!ret) {
                        acpi_inc_align(ctx, tpm2->header.length);
                        acpi_add_table(ctx, tpm2);
                } else {
                        log_warning("TPM2 table creation failed\n");
                }
        }

        debug("ACPI:    * MADT\n");
        madt = ctx->current;
        acpi_create_madt(madt);
        acpi_inc_align(ctx, madt->header.length);
        acpi_add_table(ctx, madt);

        if (IS_ENABLED(CONFIG_TPM_V1)) {
                debug("ACPI:    * TCPA\n");
                tcpa = (struct acpi_tcpa *)ctx->current;
                ret = acpi_create_tcpa(tcpa);
                if (ret) {
                        log_warning("Failed to create TCPA table (err=%d)\n",
                                    ret);
                } else {
                        acpi_inc_align(ctx, tcpa->header.length);
                        acpi_add_table(ctx, tcpa);
                }
        }

        debug("ACPI:    * CSRT\n");
        csrt = ctx->current;
        if (!acpi_create_csrt(csrt)) {
                acpi_inc_align(ctx, csrt->header.length);
                acpi_add_table(ctx, csrt);
        }

        debug("ACPI:    * SPCR\n");
        spcr = ctx->current;
        acpi_create_spcr(spcr);
        acpi_inc_align(ctx, spcr->header.length);
        acpi_add_table(ctx, spcr);

        acpi_write_dev_tables(ctx);

        addr = map_to_sysmem(ctx->current);
        debug("current = %lx\n", addr);

        acpi_rsdp_addr = (unsigned long)ctx->rsdp;
        debug("ACPI: done\n");

        return addr;
}

ulong acpi_get_rsdp_addr(void)
{
        return acpi_rsdp_addr;
}

/**
 * acpi_write_hpet() - Write out a HPET table
 *
 * Write out the table for High-Precision Event Timers
 *
 * @hpet: Place to put HPET table
 */
static int acpi_create_hpet(struct acpi_hpet *hpet)
{
        struct acpi_table_header *header = &hpet->header;
        struct acpi_gen_regaddr *addr = &hpet->addr;

        /*
         * See IA-PC HPET (High Precision Event Timers) Specification v1.0a
         * https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/software-developers-hpet-spec-1-0a.pdf
         */
        memset((void *)hpet, '\0', sizeof(struct acpi_hpet));

        /* Fill out header fields. */
        acpi_fill_header(header, "HPET");

        header->aslc_revision = ASL_REVISION;
        header->length = sizeof(struct acpi_hpet);
        header->revision = acpi_get_table_revision(ACPITAB_HPET);

        /* Fill out HPET address */
        addr->space_id = 0;  /* Memory */
        addr->bit_width = 64;
        addr->bit_offset = 0;
        addr->addrl = CONFIG_HPET_ADDRESS & 0xffffffff;
        addr->addrh = ((unsigned long long)CONFIG_HPET_ADDRESS) >> 32;

        hpet->id = *(u32 *)CONFIG_HPET_ADDRESS;
        hpet->number = 0;
        hpet->min_tick = 0; /* HPET_MIN_TICKS */

        header->checksum = table_compute_checksum(hpet,
                                                  sizeof(struct acpi_hpet));

        return 0;
}

int acpi_write_hpet(struct acpi_ctx *ctx)
{
        struct acpi_hpet *hpet;
        int ret;

        log_debug("ACPI:    * HPET\n");

        hpet = ctx->current;
        acpi_inc_align(ctx, sizeof(struct acpi_hpet));
        acpi_create_hpet(hpet);
        ret = acpi_add_table(ctx, hpet);
        if (ret)
                return log_msg_ret("add", ret);

        return 0;
}

int acpi_write_dbg2_pci_uart(struct acpi_ctx *ctx, struct udevice *dev,
                             uint access_size)
{
        struct acpi_dbg2_header *dbg2 = ctx->current;
        char path[ACPI_PATH_MAX];
        struct acpi_gen_regaddr address;
        phys_addr_t addr;
        int ret;

        if (!device_active(dev)) {
                log_info("Device not enabled\n");
                return -EACCES;
        }
        /*
         * PCI devices don't remember their resource allocation information in
         * U-Boot at present. We assume that MMIO is used for the UART and that
         * the address space is 32 bytes: ns16550 uses 8 registers of up to
         * 32-bits each. This is only for debugging so it is not a big deal.
         */
        addr = dm_pci_read_bar32(dev, 0);
        log_debug("UART addr %lx\n", (ulong)addr);

        memset(&address, '\0', sizeof(address));
        address.space_id = ACPI_ADDRESS_SPACE_MEMORY;
        address.addrl = (uint32_t)addr;
        address.addrh = (uint32_t)((addr >> 32) & 0xffffffff);
        address.access_size = access_size;

        ret = acpi_device_path(dev, path, sizeof(path));
        if (ret)
                return log_msg_ret("path", ret);
        acpi_create_dbg2(dbg2, ACPI_DBG2_SERIAL_PORT,
                         ACPI_DBG2_16550_COMPATIBLE, &address, 0x1000, path);

        acpi_inc_align(ctx, dbg2->header.length);
        acpi_add_table(ctx, dbg2);

        return 0;
}

void acpi_fadt_common(struct acpi_fadt *fadt, struct acpi_facs *facs,
                      void *dsdt)
{
        struct acpi_table_header *header = &fadt->header;

        memset((void *)fadt, '\0', sizeof(struct acpi_fadt));

        acpi_fill_header(header, "FACP");
        header->length = sizeof(struct acpi_fadt);
        header->revision = 4;
        memcpy(header->oem_id, OEM_ID, 6);
        memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
        memcpy(header->aslc_id, ASLC_ID, 4);
        header->aslc_revision = 1;

        fadt->firmware_ctrl = (unsigned long)facs;
        fadt->dsdt = (unsigned long)dsdt;

        fadt->x_firmware_ctl_l = (unsigned long)facs;
        fadt->x_firmware_ctl_h = 0;
        fadt->x_dsdt_l = (unsigned long)dsdt;
        fadt->x_dsdt_h = 0;

        fadt->preferred_pm_profile = ACPI_PM_MOBILE;

        /* Use ACPI 3.0 revision */
        fadt->header.revision = 4;
}

void acpi_create_dmar_drhd(struct acpi_ctx *ctx, uint flags, uint segment,
                           u64 bar)
{
        struct dmar_entry *drhd = ctx->current;

        memset(drhd, '\0', sizeof(*drhd));
        drhd->type = DMAR_DRHD;
        drhd->length = sizeof(*drhd); /* will be fixed up later */
        drhd->flags = flags;
        drhd->segment = segment;
        drhd->bar = bar;
        acpi_inc(ctx, drhd->length);
}

void acpi_create_dmar_rmrr(struct acpi_ctx *ctx, uint segment, u64 bar,
                           u64 limit)
{
        struct dmar_rmrr_entry *rmrr = ctx->current;

        memset(rmrr, '\0', sizeof(*rmrr));
        rmrr->type = DMAR_RMRR;
        rmrr->length = sizeof(*rmrr); /* will be fixed up later */
        rmrr->segment = segment;
        rmrr->bar = bar;
        rmrr->limit = limit;
        acpi_inc(ctx, rmrr->length);
}

void acpi_dmar_drhd_fixup(struct acpi_ctx *ctx, void *base)
{
        struct dmar_entry *drhd = base;

        drhd->length = ctx->current - base;
}

void acpi_dmar_rmrr_fixup(struct acpi_ctx *ctx, void *base)
{
        struct dmar_rmrr_entry *rmrr = base;

        rmrr->length = ctx->current - base;
}

static int acpi_create_dmar_ds(struct acpi_ctx *ctx, enum dev_scope_type type,
                               uint enumeration_id, pci_dev_t bdf)
{
        /* we don't support longer paths yet */
        const size_t dev_scope_length = sizeof(struct dev_scope) + 2;
        struct dev_scope *ds = ctx->current;

        memset(ds, '\0', dev_scope_length);
        ds->type = type;
        ds->length = dev_scope_length;
        ds->enumeration = enumeration_id;
        ds->start_bus = PCI_BUS(bdf);
        ds->path[0].dev = PCI_DEV(bdf);
        ds->path[0].fn = PCI_FUNC(bdf);

        return ds->length;
}

int acpi_create_dmar_ds_pci_br(struct acpi_ctx *ctx, pci_dev_t bdf)
{
        return acpi_create_dmar_ds(ctx, SCOPE_PCI_SUB, 0, bdf);
}

int acpi_create_dmar_ds_pci(struct acpi_ctx *ctx, pci_dev_t bdf)
{
        return acpi_create_dmar_ds(ctx, SCOPE_PCI_ENDPOINT, 0, bdf);
}

int acpi_create_dmar_ds_ioapic(struct acpi_ctx *ctx, uint enumeration_id,
                               pci_dev_t bdf)
{
        return acpi_create_dmar_ds(ctx, SCOPE_IOAPIC, enumeration_id, bdf);
}

int acpi_create_dmar_ds_msi_hpet(struct acpi_ctx *ctx, uint enumeration_id,
                                 pci_dev_t bdf)
{
        return acpi_create_dmar_ds(ctx, SCOPE_MSI_HPET, enumeration_id, bdf);
}