linux-imx

/*

 * processor_idle - idle state submodule to the ACPI processor driver

 *

 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>

 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>

 *  Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de>

 *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>

 *              - Added processor hotplug support

 *  Copyright (C) 2005  Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>

 *              - Added support for C3 on SMP

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or (at

 *  your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful, but

 *  WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 *  General Public License for more details.

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 */

#define pr_fmt(fmt) "ACPI: " fmt

​

#include <linux/module.h>

#include <linux/acpi.h>

#include <linux/dmi.h>

#include <linux/sched.h>       /* need_resched() */

#include <linux/tick.h>

#include <linux/cpuidle.h>

#include <linux/cpu.h>

#include <acpi/processor.h>

​

/*

 * Include the apic definitions for x86 to have the APIC timer related defines

 * available also for UP (on SMP it gets magically included via linux/smp.h).

 * asm/acpi.h is not an option, as it would require more include magic. Also

 * creating an empty asm-ia64/apic.h would just trade pest vs. cholera.

 */

#ifdef CONFIG_X86

#include <asm/apic.h>

#endif

​

#define ACPI_PROCESSOR_CLASS            "processor"

#define _COMPONENT              ACPI_PROCESSOR_COMPONENT

ACPI_MODULE_NAME("processor_idle");

​

#define ACPI_IDLE_STATE_START   (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX) ? 1 : 0)

​

static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;

module_param(max_cstate, uint, 0000);

static unsigned int nocst __read_mostly;

module_param(nocst, uint, 0000);

static int bm_check_disable __read_mostly;

module_param(bm_check_disable, uint, 0000);

​

static unsigned int latency_factor __read_mostly = 2;

module_param(latency_factor, uint, 0644);

​

static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device);