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4f19048f | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
1da177e4 LT |
2 | /* |
3 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> | |
4 | * | |
1da177e4 LT |
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 */ | |
1cce76c2 RR |
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 */ | |
1da177e4 LT |
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 | |
bbfebd66 | 20 | * the speedstep_get_frequency() call. */ |
1cce76c2 RR |
21 | SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */ |
22 | SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */ | |
23 | SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */ | |
24 | }; | |
1da177e4 LT |
25 | |
26 | /* speedstep states -- only two of them */ | |
27 | ||
32ee8c3e DJ |
28 | #define SPEEDSTEP_HIGH 0x00000000 |
29 | #define SPEEDSTEP_LOW 0x00000001 | |
1da177e4 LT |
30 | |
31 | ||
32 | /* detect a speedstep-capable processor */ | |
1cce76c2 | 33 | extern enum speedstep_processor speedstep_detect_processor(void); |
1da177e4 LT |
34 | |
35 | /* detect the current speed (in khz) of the processor */ | |
1cce76c2 | 36 | extern unsigned int speedstep_get_frequency(enum speedstep_processor processor); |
1da177e4 LT |
37 | |
38 | ||
32ee8c3e DJ |
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 | |
1da177e4 LT |
42 | * cpufreq_notify_transition calls are initiated. |
43 | */ | |
1cce76c2 | 44 | extern unsigned int speedstep_get_freqs(enum speedstep_processor processor, |
32ee8c3e DJ |
45 | unsigned int *low_speed, |
46 | unsigned int *high_speed, | |
47 | unsigned int *transition_latency, | |
48 | void (*set_state) (unsigned int state)); |