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

/*
 * (C) 2002 - 2003 Dominik Brodowski <[email protected]>
 *
 *  Licensed under the terms of the GNU GPL License version 2.
 *
 *  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
1da177e4 LT	1	/*
	2	* (C) 2002 - 2003 Dominik Brodowski <[email protected]>
	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 */
1cce76c2 RR	14	enum 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 */
1da177e4 LT	19	/* the following processors are not speedstep-capable and are not auto-detected
1da177e4 LT	20	* in speedstep_detect_processor(). However, their speed can be detected using
bbfebd66	21	* the speedstep_get_frequency() call. */
1cce76c2 RR	22	SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */
	23	SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */
	24	SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */
	25	};
1da177e4 LT	26
	27	/* speedstep states -- only two of them */
	28
32ee8c3e DJ	29	#define SPEEDSTEP_HIGH 0x00000000
32ee8c3e DJ	30	#define SPEEDSTEP_LOW 0x00000001
1da177e4 LT	31
	32
	33	/* detect a speedstep-capable processor */
1cce76c2	34	extern enum speedstep_processor speedstep_detect_processor(void);
1da177e4 LT	35
1da177e4 LT	36	/* detect the current speed (in khz) of the processor */
1cce76c2	37	extern unsigned int speedstep_get_frequency(enum speedstep_processor processor);
1da177e4 LT	38
1da177e4 LT	39
32ee8c3e DJ	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
1da177e4 LT	43	* cpufreq_notify_transition calls are initiated.
1da177e4 LT	44	*/
1cce76c2	45	extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,
32ee8c3e DJ	46	unsigned int *low_speed,
	47	unsigned int *high_speed,
	48	unsigned int *transition_latency,
	49	void (*set_state) (unsigned int state));