| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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)); |