// SPDX-License-Identifier: GPL-2.0
/*
 * Author: Huacai Chen <chenhuacai@loongson.cn>
 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
 */
#include <linux/acpi.h>
#include <linux/platform_device.h>

#include <asm/bootinfo.h>
#include <asm/loongson.h>

void enable_gpe_wakeup(void)
{
        if (acpi_disabled)
               return;

        if (acpi_gbl_reduced_hardware)
               return;

        acpi_hw_enable_all_wakeup_gpes();
}

void enable_pci_wakeup(void)
{
        if (acpi_disabled)
               return;

        if (acpi_gbl_reduced_hardware)
               return;

        acpi_write_bit_register(ACPI_BITREG_PCIEXP_WAKE_STATUS, 1);

        if (acpi_gbl_FADT.flags & ACPI_FADT_PCI_EXPRESS_WAKE)
                acpi_write_bit_register(ACPI_BITREG_PCIEXP_WAKE_DISABLE, 0);
}

static struct platform_device loongson3_cpufreq_device = {
        .name = "loongson3_cpufreq",
        .id = -1,
};

static int __init loongson_cpufreq_init(void)
{
        if (!cpu_has_scalefreq)
                return -ENODEV;

        return platform_device_register(&loongson3_cpufreq_device);
}

arch_initcall(loongson_cpufreq_init);

static void default_suspend_addr(void)
{
        acpi_enter_sleep_state(ACPI_STATE_S3);
}

static int __init loongson3_acpi_suspend_init(void)
{
#ifdef CONFIG_ACPI
        acpi_status status;
        uint64_t suspend_addr = 0;

        if (acpi_disabled)
                return 0;

        if (!acpi_gbl_reduced_hardware)
                acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);

        if (!acpi_sleep_state_supported(ACPI_STATE_S3))
                return 0;

        status = acpi_evaluate_integer(NULL, "\\SADR", NULL, &suspend_addr);
        if (ACPI_FAILURE(status) || !suspend_addr) {
                pr_info("ACPI S3 supported with hardware register default\n");
                loongson_sysconf.suspend_addr = (unsigned long)default_suspend_addr;
        } else {
                pr_info("ACPI S3 supported with Loongson ACPI SADR extension\n");
                loongson_sysconf.suspend_addr = (unsigned long)phys_to_virt(PHYSADDR(suspend_addr));
        }
#endif
        return 0;
}

device_initcall(loongson3_acpi_suspend_init);