/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2001 Mitsuru IWASAKI
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>

#include <vm/vm.h>
#include <vm/pmap.h>

#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/actables.h>

#include <dev/acpica/acpivar.h>

#include <machine/nexusvar.h>

int acpi_resume_beep;
SYSCTL_INT(_debug_acpi, OID_AUTO, resume_beep, CTLFLAG_RWTUN,
    &acpi_resume_beep, 0, "Beep the PC speaker when resuming");

int acpi_reset_video;
TUNABLE_INT("hw.acpi.reset_video", &acpi_reset_video);

static int intr_model = ACPI_INTR_PIC;

int
acpi_machdep_init(device_t dev)
{
        struct acpi_softc *sc;

        sc = device_get_softc(dev);

        acpi_apm_init(sc);
        acpi_install_wakeup_handler(sc);

        if (intr_model != ACPI_INTR_PIC)
                acpi_SetIntrModel(intr_model);

        SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx,
            SYSCTL_CHILDREN(sc->acpi_sysctl_tree), OID_AUTO,
            "reset_video", CTLFLAG_RW, &acpi_reset_video, 0,
            "Call the VESA reset BIOS vector on the resume path");

        return (0);
}

void
acpi_SetDefaultIntrModel(int model)
{

        intr_model = model;
}

int
acpi_machdep_quirks(int *quirks)
{

        return (0);
}

/*
 * Map a table.  First map the header to determine the table length and then map
 * the entire table.
 */
static void *
map_table(vm_paddr_t pa, const char *sig)
{
        ACPI_TABLE_HEADER *header;
        vm_size_t length;
        void *table;

        header = pmap_mapbios(pa, sizeof(ACPI_TABLE_HEADER));
        if (strncmp(header->Signature, sig, ACPI_NAMESEG_SIZE) != 0) {
                pmap_unmapbios(header, sizeof(ACPI_TABLE_HEADER));
                return (NULL);
        }
        length = header->Length;
        pmap_unmapbios(header, sizeof(ACPI_TABLE_HEADER));
        table = pmap_mapbios(pa, length);
        if (ACPI_FAILURE(AcpiUtChecksum(table, length))) {
                if (bootverbose)
                        printf("ACPI: Failed checksum for table %s\n", sig);
#if (ACPI_CHECKSUM_ABORT)
                pmap_unmapbios(table, length);
                return (NULL);
#endif
        }
        return (table);
}

/*
 * See if a given ACPI table is the requested table.  Returns the
 * length of the table if it matches or zero on failure.
 */
static int
probe_table(vm_paddr_t address, const char *sig)
{
        ACPI_TABLE_HEADER *table;
        int ret;

        table = pmap_mapbios(address, sizeof(ACPI_TABLE_HEADER));
        ret = strncmp(table->Signature, sig, ACPI_NAMESEG_SIZE) == 0;
        pmap_unmapbios(table, sizeof(ACPI_TABLE_HEADER));
        return (ret);
}

/*
 * Try to map a table at a given physical address previously returned
 * by acpi_find_table().
 */
void *
acpi_map_table(vm_paddr_t pa, const char *sig)
{

        return (map_table(pa, sig));
}

/* Unmap a table previously mapped via acpi_map_table(). */
void
acpi_unmap_table(void *table)
{
        ACPI_TABLE_HEADER *header;

        header = (ACPI_TABLE_HEADER *)table;
        pmap_unmapbios(table, header->Length);
}

/*
 * Return the physical address of the requested table or zero if one
 * is not found.
 */
vm_paddr_t
acpi_find_table(const char *sig)
{
        ACPI_PHYSICAL_ADDRESS rsdp_ptr;
        ACPI_TABLE_RSDP *rsdp;
        ACPI_TABLE_RSDT *rsdt;
        ACPI_TABLE_XSDT *xsdt;
        ACPI_TABLE_HEADER *table;
        vm_paddr_t addr;
        int i, count;

        if (resource_disabled("acpi", 0))
                return (0);

        /*
         * Map in the RSDP.  Since ACPI uses AcpiOsMapMemory() which in turn
         * calls pmap_mapbios() to find the RSDP, we assume that we can use
         * pmap_mapbios() to map the RSDP.
         */
        if ((rsdp_ptr = AcpiOsGetRootPointer()) == 0)
                return (0);
        rsdp = pmap_mapbios(rsdp_ptr, sizeof(ACPI_TABLE_RSDP));
        if (rsdp == NULL) {
                printf("ACPI: Failed to map RSDP\n");
                return (0);
        }

        /*
         * For ACPI >= 2.0, use the XSDT if it is available.
         * Otherwise, use the RSDT.
         */
        addr = 0;
        if (rsdp->Revision >= 2 && rsdp->XsdtPhysicalAddress != 0) {
                /*
                 * AcpiOsGetRootPointer only verifies the checksum for
                 * the version 1.0 portion of the RSDP.  Version 2.0 has
                 * an additional checksum that we verify first.
                 */
                if (AcpiUtChecksum((UINT8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)) {
                        printf("ACPI: RSDP failed extended checksum\n");
                        pmap_unmapbios(rsdp, sizeof(ACPI_TABLE_RSDP));
                        return (0);
                }
                xsdt = map_table(rsdp->XsdtPhysicalAddress, ACPI_SIG_XSDT);
                if (xsdt == NULL) {
                        printf("ACPI: Failed to map XSDT\n");
                        pmap_unmapbios(rsdp, sizeof(ACPI_TABLE_RSDP));
                        return (0);
                }
                count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
                    sizeof(UINT64);
                for (i = 0; i < count; i++)
                        if (probe_table(xsdt->TableOffsetEntry[i], sig)) {
                                addr = xsdt->TableOffsetEntry[i];
                                break;
                        }
                acpi_unmap_table(xsdt);
        } else {
                rsdt = map_table(rsdp->RsdtPhysicalAddress, ACPI_SIG_RSDT);
                if (rsdt == NULL) {
                        printf("ACPI: Failed to map RSDT\n");
                        pmap_unmapbios(rsdp, sizeof(ACPI_TABLE_RSDP));
                        return (0);
                }
                count = (rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
                    sizeof(UINT32);
                for (i = 0; i < count; i++)
                        if (probe_table(rsdt->TableOffsetEntry[i], sig)) {
                                addr = rsdt->TableOffsetEntry[i];
                                break;
                        }
                acpi_unmap_table(rsdt);
        }
        pmap_unmapbios(rsdp, sizeof(ACPI_TABLE_RSDP));
        if (addr == 0)
                return (0);

        /*
         * Verify that we can map the full table and that its checksum is
         * correct, etc.
         */
        table = map_table(addr, sig);
        if (table == NULL)
                return (0);
        acpi_unmap_table(table);

        return (addr);
}

/*
 * ACPI nexus(4) driver.
 */
static int
nexus_acpi_probe(device_t dev)
{
        int error;

        error = acpi_identify();
        if (error)
                return (error);
        device_quiet(dev);
        return (BUS_PROBE_DEFAULT);
}

static int
nexus_acpi_attach(device_t dev)
{

        nexus_init_resources();
        bus_identify_children(dev);
        if (BUS_ADD_CHILD(dev, 10, "acpi", 0) == NULL)
                panic("failed to add acpi0 device");
        bus_attach_children(dev);

        return (0);
}

static device_method_t nexus_acpi_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         nexus_acpi_probe),
        DEVMETHOD(device_attach,        nexus_acpi_attach),
        { 0, 0 }
};

DEFINE_CLASS_1(nexus, nexus_acpi_driver, nexus_acpi_methods, 1, nexus_driver);

DRIVER_MODULE(nexus_acpi, root, nexus_acpi_driver, 0, 0);