[linux.git] / drivers / cpufreq / speedstep-lib.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * (C) 2002 - 2003 Dominik Brodowski <[email protected]>
 *
 *  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));
Commit	Line	Data
4f19048f	1	/* SPDX-License-Identifier: GPL-2.0-only */
1da177e4 LT	2	/*
	3	* (C) 2002 - 2003 Dominik Brodowski <[email protected]>
	4	*
1da177e4 LT	5	* Library for common functions for Intel SpeedStep v.1 and v.2 support
	6	*
	7	* BIG FAT DISCLAIMER: Work in progress code. Possibly dangerous
	8	*/
	9
	10
	11
	12	/* processors */
1cce76c2 RR	13	enum speedstep_processor {
	14	SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */
	15	SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */
	16	SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */
	17	SPEEDSTEP_CPU_P4M = 0x00000004, /* P4-M */
1da177e4 LT	18	/* the following processors are not speedstep-capable and are not auto-detected
1da177e4 LT	19	* in speedstep_detect_processor(). However, their speed can be detected using
bbfebd66	20	* the speedstep_get_frequency() call. */
1cce76c2 RR	21	SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */
	22	SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */
	23	SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */
	24	};
1da177e4 LT	25
	26	/* speedstep states -- only two of them */
	27
32ee8c3e DJ	28	#define SPEEDSTEP_HIGH 0x00000000
32ee8c3e DJ	29	#define SPEEDSTEP_LOW 0x00000001
1da177e4 LT	30
	31
	32	/* detect a speedstep-capable processor */
1cce76c2	33	extern enum speedstep_processor speedstep_detect_processor(void);
1da177e4 LT	34
1da177e4 LT	35	/* detect the current speed (in khz) of the processor */
1cce76c2	36	extern unsigned int speedstep_get_frequency(enum speedstep_processor processor);
1da177e4 LT	37
1da177e4 LT	38
32ee8c3e DJ	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
1da177e4 LT	42	* cpufreq_notify_transition calls are initiated.
1da177e4 LT	43	*/
1cce76c2	44	extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,
32ee8c3e DJ	45	unsigned int *low_speed,
	46	unsigned int *high_speed,
	47	unsigned int *transition_latency,
	48	void (*set_state) (unsigned int state));