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));

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
 
 
 4 *
 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 */
13enum 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  */
18/* the following processors are not speedstep-capable and are not auto-detected
19 * in speedstep_detect_processor(). However, their speed can be detected using
20 * the speedstep_get_frequency() call. */
21	SPEEDSTEP_CPU_PM	   = 0xFFFFFF03,  /* Pentium M  */
22	SPEEDSTEP_CPU_P4D	   = 0xFFFFFF04,  /* desktop P4  */
23	SPEEDSTEP_CPU_PCORE	   = 0xFFFFFF05,  /* Core */
24};
25
26/* speedstep states -- only two of them */
27
28#define SPEEDSTEP_HIGH	0x00000000
29#define SPEEDSTEP_LOW	0x00000001
30
31
32/* detect a speedstep-capable processor */
33extern enum speedstep_processor speedstep_detect_processor(void);
34
35/* detect the current speed (in khz) of the processor */
36extern unsigned int speedstep_get_frequency(enum speedstep_processor processor);
37
38
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
42 * cpufreq_notify_transition calls are initiated.
43 */
44extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,
45	unsigned int *low_speed,
46	unsigned int *high_speed,
47	unsigned int *transition_latency,
48	void (*set_state) (unsigned int state));