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 with 100 MHz FSB */
  19
  20 /* speedstep states -- only two of them */
  21
  22 #define SPEEDSTEP_HIGH                  0x00000000
  23 #define SPEEDSTEP_LOW                   0x00000001
  24
  25
  26 /* detect a speedstep-capable processor */
  27 extern unsigned int speedstep_detect_processor (void);
  28
  29 /* detect the current speed (in khz) of the processor */
  30 extern unsigned int speedstep_get_processor_frequency(unsigned int processor);
  31
  32
  33 /* detect the low and high speeds of the processor. The callback
  34  * set_state"'s first argument is either SPEEDSTEP_HIGH or
  35  * SPEEDSTEP_LOW; the second argument is zero so that no
  36  * cpufreq_notify_transition calls are initiated.
  37  */
  38 extern unsigned int speedstep_get_freqs(unsigned int processor,
  39           unsigned int *low_speed,
  40           unsigned int *high_speed,
  41           void (*set_state) (unsigned int state, unsigned int notify));