49 строки
1.7 KiB
C
49 строки
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
|
|
*
|
|
* Library for common functions for Intel SpeedStep v.1 and v.2 support
|
|
*
|
|
* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
|
|
*/
|
|
|
|
|
|
|
|
/* processors */
|
|
enum speedstep_processor {
|
|
SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */
|
|
SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */
|
|
SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */
|
|
SPEEDSTEP_CPU_P4M = 0x00000004, /* P4-M */
|
|
/* the following processors are not speedstep-capable and are not auto-detected
|
|
* in speedstep_detect_processor(). However, their speed can be detected using
|
|
* the speedstep_get_frequency() call. */
|
|
SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */
|
|
SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */
|
|
SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */
|
|
};
|
|
|
|
/* speedstep states -- only two of them */
|
|
|
|
#define SPEEDSTEP_HIGH 0x00000000
|
|
#define SPEEDSTEP_LOW 0x00000001
|
|
|
|
|
|
/* detect a speedstep-capable processor */
|
|
extern enum speedstep_processor speedstep_detect_processor(void);
|
|
|
|
/* detect the current speed (in khz) of the processor */
|
|
extern unsigned int speedstep_get_frequency(enum speedstep_processor processor);
|
|
|
|
|
|
/* detect the low and high speeds of the processor. The callback
|
|
* set_state"'s first argument is either SPEEDSTEP_HIGH or
|
|
* SPEEDSTEP_LOW; the second argument is zero so that no
|
|
* cpufreq_notify_transition calls are initiated.
|
|
*/
|
|
extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,
|
|
unsigned int *low_speed,
|
|
unsigned int *high_speed,
|
|
unsigned int *transition_latency,
|
|
void (*set_state) (unsigned int state));
|