linux/drivers/cpufreq/speedstep-lib.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * (C) 2002 - 2003 Dominik Brodowski <[email protected]>
 *
 *  Library for common functions for Intel SpeedStep v.1 and v.2 support
 *
 *  BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/cpufreq.h>

#include <asm/msr.h>
#include <asm/tsc.h>
#include "speedstep-lib.h"

#define PFX …

#ifdef CONFIG_X86_SPEEDSTEP_RELAXED_CAP_CHECK
static int relaxed_check;
#else
#define relaxed_check …
#endif

/*********************************************************************
 *                   GET PROCESSOR CORE SPEED IN KHZ                 *
 *********************************************************************/

static unsigned int pentium3_get_frequency(enum speedstep_processor processor)
{ … }


static unsigned int pentiumM_get_frequency(void)
{ … }

static unsigned int pentium_core_get_frequency(void)
{ … }


static unsigned int pentium4_get_frequency(void)
{ … }


/* Warning: may get called from smp_call_function_single. */
unsigned int speedstep_get_frequency(enum speedstep_processor processor)
{ … }
EXPORT_SYMBOL_GPL(…);


/*********************************************************************
 *                 DETECT SPEEDSTEP-CAPABLE PROCESSOR                *
 *********************************************************************/

/* Keep in sync with the x86_cpu_id tables in the different modules */
enum speedstep_processor speedstep_detect_processor(void)
{ … }
EXPORT_SYMBOL_GPL(…);


/*********************************************************************
 *                     DETECT SPEEDSTEP SPEEDS                       *
 *********************************************************************/

unsigned int speedstep_get_freqs(enum speedstep_processor processor,
				  unsigned int *low_speed,
				  unsigned int *high_speed,
				  unsigned int *transition_latency,
				  void (*set_state) (unsigned int state))
{ … }
EXPORT_SYMBOL_GPL(…);

#ifdef CONFIG_X86_SPEEDSTEP_RELAXED_CAP_CHECK
module_param(relaxed_check, int, 0444);
MODULE_PARM_DESC(relaxed_check,
		"Don't do all checks for speedstep capability.");
#endif

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;