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 support 6 * 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-detected 19 * in speedstep_detect_processor(). However, their speed can be detected using 20 * 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 0x00000000 29#define SPEEDSTEP_LOW 0x00000001 30 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 callback 40 * set_state"'s first argument is either SPEEDSTEP_HIGH or 41 * SPEEDSTEP_LOW; the second argument is zero so that no 42 * 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