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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>4 *5 * Library for common functions for Intel SpeedStep v.1 and v.2 support6 *7 * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*8 */9 10 11 12/* processors */13enum speedstep_processor {14 SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */15 SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */16 SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */17 SPEEDSTEP_CPU_P4M = 0x00000004, /* P4-M */18/* the following processors are not speedstep-capable and are not auto-detected19 * in speedstep_detect_processor(). However, their speed can be detected using20 * the speedstep_get_frequency() call. */21 SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */22 SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */23 SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */24};25 26/* speedstep states -- only two of them */27 28#define SPEEDSTEP_HIGH 0x0000000029#define SPEEDSTEP_LOW 0x0000000130 31 32/* detect a speedstep-capable processor */33extern enum speedstep_processor speedstep_detect_processor(void);34 35/* detect the current speed (in khz) of the processor */36extern unsigned int speedstep_get_frequency(enum speedstep_processor processor);37 38 39/* detect the low and high speeds of the processor. The callback40 * set_state"'s first argument is either SPEEDSTEP_HIGH or41 * SPEEDSTEP_LOW; the second argument is zero so that no42 * cpufreq_notify_transition calls are initiated.43 */44extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,45 unsigned int *low_speed,46 unsigned int *high_speed,47 unsigned int *transition_latency,48 void (*set_state) (unsigned int state));49