linux/drivers/cpufreq/speedstep-lib.h
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   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 */
  14enum speedstep_processor {
  15        SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001,  /* Coppermine core */
  16        SPEEDSTEP_CPU_PIII_C       = 0x00000002,  /* Coppermine core */
  17        SPEEDSTEP_CPU_PIII_T       = 0x00000003,  /* Tualatin core */
  18        SPEEDSTEP_CPU_P4M          = 0x00000004,  /* P4-M  */
  19/* the following processors are not speedstep-capable and are not auto-detected
  20 * in speedstep_detect_processor(). However, their speed can be detected using
  21 * the speedstep_get_frequency() call. */
  22        SPEEDSTEP_CPU_PM           = 0xFFFFFF03,  /* Pentium M  */
  23        SPEEDSTEP_CPU_P4D          = 0xFFFFFF04,  /* desktop P4  */
  24        SPEEDSTEP_CPU_PCORE        = 0xFFFFFF05,  /* Core */
  25};
  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 */
  34extern enum speedstep_processor speedstep_detect_processor(void);
  35
  36/* detect the current speed (in khz) of the processor */
  37extern unsigned int speedstep_get_frequency(enum speedstep_processor 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 */
  45extern unsigned int speedstep_get_freqs(enum speedstep_processor 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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