arch/i386/kernel/cpu/cpufreq/speedstep-lib.h

   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           unsigned int *transition_latency,
  48           void (*set_state) (unsigned int state));