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 */ |
13 | enum 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 */ |
33 | extern enum speedstep_processor speedstep_detect_processor(void); |
34 | |
35 | /* detect the current speed (in khz) of the processor */ |
36 | extern 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 | */ |
44 | extern 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 | |