1 /* 2 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> 3 * 4 * Licensed under the terms of the GNU GPL License version 2. 5 * 6 * Library for common functions for Intel SpeedStep v.1 and v.2 support 7 * 8 * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous* 9 */ 10 11 12 13 /* processors */ 14 enum speedstep_processor { 15 SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */ 16 SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */ 17 SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */ 18 SPEEDSTEP_CPU_P4M = 0x00000004, /* P4-M */ 19 /* the following processors are not speedstep-capable and are not auto-detected 20 * in speedstep_detect_processor(). However, their speed can be detected using 21 * the speedstep_get_frequency() call. */ 22 SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */ 23 SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */ 24 SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */ 25 }; 26 27 /* speedstep states -- only two of them */ 28 29 #define SPEEDSTEP_HIGH 0x00000000 30 #define SPEEDSTEP_LOW 0x00000001 31 32 33 /* detect a speedstep-capable processor */ 34 extern enum speedstep_processor speedstep_detect_processor(void); 35 36 /* detect the current speed (in khz) of the processor */ 37 extern unsigned int speedstep_get_frequency(enum speedstep_processor processor); 38 39 40 /* detect the low and high speeds of the processor. The callback 41 * set_state"'s first argument is either SPEEDSTEP_HIGH or 42 * SPEEDSTEP_LOW; the second argument is zero so that no 43 * cpufreq_notify_transition calls are initiated. 44 */ 45 extern unsigned int speedstep_get_freqs(enum speedstep_processor processor, 46 unsigned int *low_speed, 47 unsigned int *high_speed, 48 unsigned int *transition_latency, 49 void (*set_state) (unsigned int state)); 50