linux-imx

/*

 * Intel SpeedStep SMI driver.

 *

 * (C) 2003  Hiroshi Miura <miura@da-cha.org>

 *

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

 *

 */

​

​

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

 *                        SPEEDSTEP - DEFINITIONS                    *

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

​

#define pr_fmt(fmt) "cpufreq: " fmt

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/init.h>

#include <linux/cpufreq.h>

#include <linux/delay.h>

#include <linux/io.h>

#include <asm/ist.h>

#include <asm/cpu_device_id.h>

​

#include "speedstep-lib.h"

​

/* speedstep system management interface port/command.

 *

 * These parameters are got from IST-SMI BIOS call.

 * If user gives it, these are used.

 *

 */

static int smi_port;

static int smi_cmd;

static unsigned int smi_sig;

​

/* info about the processor */

static enum speedstep_processor speedstep_processor;

​

/*

 * 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},

};

​

#define GET_SPEEDSTEP_OWNER 0

#define GET_SPEEDSTEP_STATE 1

#define SET_SPEEDSTEP_STATE 2

#define GET_SPEEDSTEP_FREQS 4

​

/* how often shall the SMI call be tried if it failed, e.g. because

 * of DMA activity going on? */

#define SMI_TRIES 5

​

/**

 * speedstep_smi_ownership

 */