/* SPDX-License-Identifier: GPL-2.0-only */ /* * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> * * Library for common functions for Intel SpeedStep v.1 and v.2 support * * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous* */ /* processors */ enum speedstep_processor { SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */ SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */ SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */ SPEEDSTEP_CPU_P4M = 0x00000004, /* P4-M */ /* the following processors are not speedstep-capable and are not auto-detected * in speedstep_detect_processor(). However, their speed can be detected using * the speedstep_get_frequency() call. */ SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */ SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */ SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */ }; /* speedstep states -- only two of them */ #define SPEEDSTEP_HIGH 0x00000000 #define SPEEDSTEP_LOW 0x00000001 /* detect a speedstep-capable processor */ extern enum speedstep_processor speedstep_detect_processor(void); /* detect the current speed (in khz) of the processor */ extern unsigned int speedstep_get_frequency(enum speedstep_processor processor); /* detect the low and high speeds of the processor. The callback * set_state"'s first argument is either SPEEDSTEP_HIGH or * SPEEDSTEP_LOW; the second argument is zero so that no * cpufreq_notify_transition calls are initiated. */ extern unsigned int speedstep_get_freqs(enum speedstep_processor processor, unsigned int *low_speed, unsigned int *high_speed, unsigned int *transition_latency, void (*set_state) (unsigned int state));