linux-imx

/*

 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)

 *

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

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

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

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

 *              - Added processor hotplug support

 *

 *

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

 *

 *  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.

 *

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/cpufreq.h>

#include <linux/slab.h>

#include <linux/acpi.h>

#include <acpi/processor.h>

#ifdef CONFIG_X86

#include <asm/cpufeature.h>

#endif

​

#define PREFIX "ACPI: "

​

#define ACPI_PROCESSOR_CLASS        "processor"

#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"

#define _COMPONENT      ACPI_PROCESSOR_COMPONENT

ACPI_MODULE_NAME("processor_perflib");

​

static DEFINE_MUTEX(performance_mutex);

​

/*

 * _PPC support is implemented as a CPUfreq policy notifier:

 * This means each time a CPUfreq driver registered also with

 * the ACPI core is asked to change the speed policy, the maximum

 * value is adjusted so that it is within the platform limit.

 *

 * Also, when a new platform limit value is detected, the CPUfreq

 * policy is adjusted accordingly.

 */

​

/* ignore_ppc:

 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet

 *       ignore _PPC

 *  0 -> cpufreq low level drivers initialized -> consider _PPC values

 *  1 -> ignore _PPC totally -> forced by user through boot param

 */

static int ignore_ppc = -1;

module_param(ignore_ppc, int, 0644);

MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \