49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
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*
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* Library for common functions for Intel SpeedStep v.1 and v.2 support
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*
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* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
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*/
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/* processors */
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enum speedstep_processor {
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SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */
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SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */
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SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */
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SPEEDSTEP_CPU_P4M = 0x00000004, /* P4-M */
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/* the following processors are not speedstep-capable and are not auto-detected
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* 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 */
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SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */
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SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */
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};
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/* speedstep states -- only two of them */
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#define SPEEDSTEP_HIGH 0x00000000
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#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
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* set_state"'s first argument is either SPEEDSTEP_HIGH or
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* SPEEDSTEP_LOW; the second argument is zero so that no
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* cpufreq_notify_transition calls are initiated.
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*/
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extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,
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unsigned int *low_speed,
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unsigned int *high_speed,
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unsigned int *transition_latency,
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void (*set_state) (unsigned int state));
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