1*4f19048fSThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */ 2bb0a56ecSDave Jones /* 3bb0a56ecSDave Jones * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> 4bb0a56ecSDave Jones * 5bb0a56ecSDave Jones * Library for common functions for Intel SpeedStep v.1 and v.2 support 6bb0a56ecSDave Jones * 7bb0a56ecSDave Jones * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous* 8bb0a56ecSDave Jones */ 9bb0a56ecSDave Jones 10bb0a56ecSDave Jones 11bb0a56ecSDave Jones 12bb0a56ecSDave Jones /* processors */ 13bb0a56ecSDave Jones enum speedstep_processor { 14bb0a56ecSDave Jones SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */ 15bb0a56ecSDave Jones SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */ 16bb0a56ecSDave Jones SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */ 17bb0a56ecSDave Jones SPEEDSTEP_CPU_P4M = 0x00000004, /* P4-M */ 18bb0a56ecSDave Jones /* the following processors are not speedstep-capable and are not auto-detected 19bb0a56ecSDave Jones * in speedstep_detect_processor(). However, their speed can be detected using 20bb0a56ecSDave Jones * the speedstep_get_frequency() call. */ 21bb0a56ecSDave Jones SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */ 22bb0a56ecSDave Jones SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */ 23bb0a56ecSDave Jones SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */ 24bb0a56ecSDave Jones }; 25bb0a56ecSDave Jones 26bb0a56ecSDave Jones /* speedstep states -- only two of them */ 27bb0a56ecSDave Jones 28bb0a56ecSDave Jones #define SPEEDSTEP_HIGH 0x00000000 29bb0a56ecSDave Jones #define SPEEDSTEP_LOW 0x00000001 30bb0a56ecSDave Jones 31bb0a56ecSDave Jones 32bb0a56ecSDave Jones /* detect a speedstep-capable processor */ 33bb0a56ecSDave Jones extern enum speedstep_processor speedstep_detect_processor(void); 34bb0a56ecSDave Jones 35bb0a56ecSDave Jones /* detect the current speed (in khz) of the processor */ 36bb0a56ecSDave Jones extern unsigned int speedstep_get_frequency(enum speedstep_processor processor); 37bb0a56ecSDave Jones 38bb0a56ecSDave Jones 39bb0a56ecSDave Jones /* detect the low and high speeds of the processor. The callback 40bb0a56ecSDave Jones * set_state"'s first argument is either SPEEDSTEP_HIGH or 41bb0a56ecSDave Jones * SPEEDSTEP_LOW; the second argument is zero so that no 42bb0a56ecSDave Jones * cpufreq_notify_transition calls are initiated. 43bb0a56ecSDave Jones */ 44bb0a56ecSDave Jones extern unsigned int speedstep_get_freqs(enum speedstep_processor processor, 45bb0a56ecSDave Jones unsigned int *low_speed, 46bb0a56ecSDave Jones unsigned int *high_speed, 47bb0a56ecSDave Jones unsigned int *transition_latency, 48bb0a56ecSDave Jones void (*set_state) (unsigned int state)); 49