| /* 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)); |
