linux/drivers/cpufreq/speedstep-lib.h
Thomas Gleixner 4f19048fd0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166
Based on 1 normalized pattern(s):

  licensed under the terms of the gnu gpl license version 2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 62 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.929121379@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:39 -07:00

49 lines
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));