linux-imx

/*

 * (C) 2001  Dave Jones, Arjan van de ven.

 * (C) 2002 - 2003  Dominik Brodowski <linux@brodo.de>

 *

 *  Licensed under the terms of the GNU GPL License version 2.

 *  Based upon reverse engineered information, and on Intel documentation

 *  for chipsets ICH2-M and ICH3-M.

 *

 *  Many thanks to Ducrot Bruno for finding and fixing the last

 *  "missing link" for ICH2-M/ICH3-M support, and to Thomas Winkler

 *  for extensive testing.

 *

 *  BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*

 */

​

​

/*********************************************************************

 *                        SPEEDSTEP - DEFINITIONS                    *

 *********************************************************************/

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/cpufreq.h>

#include <linux/pci.h>

#include <linux/sched.h>

​

#include <asm/cpu_device_id.h>

​

#include "speedstep-lib.h"

​

​

/* speedstep_chipset:

 *   It is necessary to know which chipset is used. As accesses to

 * this device occur at various places in this module, we need a

 * static struct pci_dev * pointing to that device.

 */

static struct pci_dev *speedstep_chipset_dev;

​

​

/* speedstep_processor

 */

static enum speedstep_processor speedstep_processor;

​

static u32 pmbase;

​

/*

 *   There are only two frequency states for each processor. Values

 * are in kHz for the time being.

 */

static struct cpufreq_frequency_table speedstep_freqs[] = {

    {0, SPEEDSTEP_HIGH, 0},

    {0, SPEEDSTEP_LOW,  0},

    {0, 0,          CPUFREQ_TABLE_END},

};

​

​

/**

 * speedstep_find_register - read the PMBASE address

 *

 * Returns: -ENODEV if no register could be found