speedstep-lib.h 1.66 KB
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
 *
 *  Library for common functions for Intel SpeedStep v.1 and v.2 support
 *
 *  BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
 */



/* processors */
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enum speedstep_processor {
	SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001,  /* Coppermine core */
	SPEEDSTEP_CPU_PIII_C	   = 0x00000002,  /* Coppermine core */
	SPEEDSTEP_CPU_PIII_T	   = 0x00000003,  /* Tualatin core */
	SPEEDSTEP_CPU_P4M	   = 0x00000004,  /* P4-M  */
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/* the following processors are not speedstep-capable and are not auto-detected
 * in speedstep_detect_processor(). However, their speed can be detected using
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 * the speedstep_get_frequency() call. */
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	SPEEDSTEP_CPU_PM	   = 0xFFFFFF03,  /* Pentium M  */
	SPEEDSTEP_CPU_P4D	   = 0xFFFFFF04,  /* desktop P4  */
	SPEEDSTEP_CPU_PCORE	   = 0xFFFFFF05,  /* Core */
};
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/* speedstep states -- only two of them */

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#define SPEEDSTEP_HIGH	0x00000000
#define SPEEDSTEP_LOW	0x00000001
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/* detect a speedstep-capable processor */
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extern enum speedstep_processor speedstep_detect_processor(void);
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/* detect the current speed (in khz) of the processor */
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extern unsigned int speedstep_get_frequency(enum speedstep_processor processor);
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/* detect the low and high speeds of the processor. The callback
 * set_state"'s first argument is either SPEEDSTEP_HIGH or
 * SPEEDSTEP_LOW; the second argument is zero so that no
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 * cpufreq_notify_transition calls are initiated.
 */
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extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,
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	unsigned int *low_speed,
	unsigned int *high_speed,
	unsigned int *transition_latency,
	void (*set_state) (unsigned int state));