linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2005 Intel Corporation

 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.

 *

 *      Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>

 *      - Added _PDC for platforms with Intel CPUs

 */

​

#define pr_fmt(fmt) "ACPI: " fmt

​

#include <linux/dmi.h>

#include <linux/slab.h>

#include <linux/acpi.h>

#include <acpi/processor.h>

​

#include "internal.h"

​

#define _COMPONENT              ACPI_PROCESSOR_COMPONENT

ACPI_MODULE_NAME("processor_pdc");

​

static bool __init processor_physically_present(acpi_handle handle)

{

    int cpuid, type;

    u32 acpi_id;

    acpi_status status;

    acpi_object_type acpi_type;

    unsigned long long tmp;

    union acpi_object object = { 0 };

    struct acpi_buffer buffer = { sizeof(union acpi_object), &object };

​

    status = acpi_get_type(handle, &acpi_type);

    if (ACPI_FAILURE(status))

        return false;

​

    switch (acpi_type) {

    case ACPI_TYPE_PROCESSOR:

        status = acpi_evaluate_object(handle, NULL, NULL, &buffer);

        if (ACPI_FAILURE(status))

            return false;

        acpi_id = object.processor.proc_id;

        break;

    case ACPI_TYPE_DEVICE:

        status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);

        if (ACPI_FAILURE(status))

            return false;

        acpi_id = tmp;

        break;

    default:

        return false;

    }

​

    type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;

    cpuid = acpi_get_cpuid(handle, type, acpi_id);

​

    return !invalid_logical_cpuid(cpuid);

}

​

static void acpi_set_pdc_bits(u32 *buf)

{

    buf[0] = ACPI_PDC_REVISION_ID;

    buf[1] = 1;

​