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1da177e4 LT |
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 | ||
15 | #define SPEEDSTEP_PROCESSOR_PIII_C_EARLY 0x00000001 /* Coppermine core */ | |
16 | #define SPEEDSTEP_PROCESSOR_PIII_C 0x00000002 /* Coppermine core */ | |
17 | #define SPEEDSTEP_PROCESSOR_PIII_T 0x00000003 /* Tualatin core */ | |
18 | #define SPEEDSTEP_PROCESSOR_P4M 0x00000004 /* P4-M */ | |
19 | ||
20 | /* the following processors are not speedstep-capable and are not auto-detected | |
21 | * in speedstep_detect_processor(). However, their speed can be detected using | |
22 | * the speedstep_get_processor_frequency() call. */ | |
23 | #define SPEEDSTEP_PROCESSOR_PM 0xFFFFFF03 /* Pentium M */ | |
24 | #define SPEEDSTEP_PROCESSOR_P4D 0xFFFFFF04 /* desktop P4 */ | |
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 unsigned int speedstep_detect_processor (void); | |
34 | ||
35 | /* detect the current speed (in khz) of the processor */ | |
36 | extern unsigned int speedstep_get_processor_frequency(unsigned int 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(unsigned int processor, | |
45 | unsigned int *low_speed, | |
46 | unsigned int *high_speed, | |
47 | void (*set_state) (unsigned int state)); |