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 #define SPEEDSTEP_PROCESSOR_PCORE 0xFFFFFF05 /* Core */
26
27 /* speedstep states -- only two of them */
28
29 #define SPEEDSTEP_HIGH 0x00000000
30 #define SPEEDSTEP_LOW 0x00000001
31
32
33 /* detect a speedstep-capable processor */
34 extern unsigned int speedstep_detect_processor (void);
35
36 /* detect the current speed (in khz) of the processor */
37 extern unsigned int speedstep_get_processor_frequency(unsigned int processor);
38
39
40 /* detect the low and high speeds of the processor. The callback
41 * set_state"'s first argument is either SPEEDSTEP_HIGH or
42 * SPEEDSTEP_LOW; the second argument is zero so that no
43 * cpufreq_notify_transition calls are initiated.
44 */
45 extern unsigned int speedstep_get_freqs(unsigned int processor,
46 unsigned int *low_speed,
47 unsigned int *high_speed,
48 unsigned int *transition_latency,
49 void (*set_state) (unsigned int state));
50
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