[deliverable/linux.git] / include / linux / cpufreq.h

/*
 *  linux/include/linux/cpufreq.h
 *
 *  Copyright (C) 2001 Russell King
 *            (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
 *            
 *
 * $Id: cpufreq.h,v 1.36 2003/01/20 17:31:48 db Exp $
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef _LINUX_CPUFREQ_H
#define _LINUX_CPUFREQ_H

#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/threads.h>
#include <linux/device.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/cpumask.h>
#include <asm/div64.h>

#define CPUFREQ_NAME_LEN 16


/*********************************************************************
 *                     CPUFREQ NOTIFIER INTERFACE                    *
 *********************************************************************/

#define CPUFREQ_TRANSITION_NOTIFIER	(0)
#define CPUFREQ_POLICY_NOTIFIER		(1)

#ifdef CONFIG_CPU_FREQ
int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
#else		/* CONFIG_CPU_FREQ */
static inline int cpufreq_register_notifier(struct notifier_block *nb,
						unsigned int list)
{
	return 0;
}
static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
						unsigned int list)
{
	return 0;
}
#endif		/* CONFIG_CPU_FREQ */

/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 * two generic policies are available:
 */

#define CPUFREQ_POLICY_POWERSAVE	(1)
#define CPUFREQ_POLICY_PERFORMANCE	(2)

/* Frequency values here are CPU kHz so that hardware which doesn't run 
 * with some frequencies can complain without having to guess what per 
 * cent / per mille means. 
 * Maximum transition latency is in nanoseconds - if it's unknown,
 * CPUFREQ_ETERNAL shall be used.
 */

struct cpufreq_governor;

#define CPUFREQ_ETERNAL			(-1)
struct cpufreq_cpuinfo {
	unsigned int		max_freq;
	unsigned int		min_freq;
	unsigned int		transition_latency; /* in 10^(-9) s = nanoseconds */
};

struct cpufreq_real_policy {
	unsigned int		min;    /* in kHz */
	unsigned int		max;    /* in kHz */
        unsigned int		policy; /* see above */
	struct cpufreq_governor	*governor; /* see below */
};

struct cpufreq_policy {
	cpumask_t		cpus;	/* affected CPUs */
	unsigned int		shared_type; /* ANY or ALL affected CPUs
						should set cpufreq */
	unsigned int		cpu;    /* cpu nr of registered CPU */
	struct cpufreq_cpuinfo	cpuinfo;/* see above */

	unsigned int		min;    /* in kHz */
	unsigned int		max;    /* in kHz */
	unsigned int		cur;    /* in kHz, only needed if cpufreq
					 * governors are used */
        unsigned int		policy; /* see above */
	struct cpufreq_governor	*governor; /* see below */

	struct work_struct	update; /* if update_policy() needs to be
					 * called, but you're in IRQ context */

	struct cpufreq_real_policy	user_policy;

	struct kobject		kobj;
	struct completion	kobj_unregister;
};

#define CPUFREQ_ADJUST		(0)
#define CPUFREQ_INCOMPATIBLE	(1)
#define CPUFREQ_NOTIFY		(2)

#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
#define CPUFREQ_SHARED_TYPE_HW	 (1) /* HW does needed coordination */
#define CPUFREQ_SHARED_TYPE_ALL	 (2) /* All dependent CPUs should set freq */
#define CPUFREQ_SHARED_TYPE_ANY	 (3) /* Freq can be set from any dependent CPU*/

/******************** cpufreq transition notifiers *******************/

#define CPUFREQ_PRECHANGE	(0)
#define CPUFREQ_POSTCHANGE	(1)
#define CPUFREQ_RESUMECHANGE	(8)
#define CPUFREQ_SUSPENDCHANGE	(9)

struct cpufreq_freqs {
	unsigned int cpu;	/* cpu nr */
	unsigned int old;
	unsigned int new;
	u8 flags;		/* flags of cpufreq_driver, see below. */
};


/**
 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
 * @old:   old value
 * @div:   divisor
 * @mult:  multiplier
 *
 *
 *    new = old * mult / div
 */
static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
{
#if BITS_PER_LONG == 32

	u64 result = ((u64) old) * ((u64) mult);
	do_div(result, div);
	return (unsigned long) result;

#elif BITS_PER_LONG == 64

	unsigned long result = old * ((u64) mult);
	result /= div;
	return result;

#endif
};

/*********************************************************************
 *                          CPUFREQ GOVERNORS                        *
 *********************************************************************/

#define CPUFREQ_GOV_START  1
#define CPUFREQ_GOV_STOP   2
#define CPUFREQ_GOV_LIMITS 3

struct cpufreq_governor {
	char	name[CPUFREQ_NAME_LEN];
	int 	(*governor)	(struct cpufreq_policy *policy,
				 unsigned int event);
	ssize_t	(*show_setspeed)	(struct cpufreq_policy *policy,
					 char *buf);
	int 	(*store_setspeed)	(struct cpufreq_policy *policy,
					 unsigned int freq);
	unsigned int max_transition_latency; /* HW must be able to switch to
			next freq faster than this value in nano secs or we
			will fallback to performance governor */
	struct list_head	governor_list;
	struct module		*owner;
};

/* pass a target to the cpufreq driver 
 */
extern int cpufreq_driver_target(struct cpufreq_policy *policy,
				 unsigned int target_freq,
				 unsigned int relation);
extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
				   unsigned int target_freq,
				   unsigned int relation);


extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy);

int cpufreq_register_governor(struct cpufreq_governor *governor);
void cpufreq_unregister_governor(struct cpufreq_governor *governor);

int lock_policy_rwsem_read(int cpu);
int lock_policy_rwsem_write(int cpu);
void unlock_policy_rwsem_read(int cpu);
void unlock_policy_rwsem_write(int cpu);


/*********************************************************************
 *                      CPUFREQ DRIVER INTERFACE                     *
 *********************************************************************/

#define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
#define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */

struct freq_attr;

struct cpufreq_driver {
	struct module           *owner;
	char			name[CPUFREQ_NAME_LEN];
	u8			flags;

	/* needed by all drivers */
	int	(*init)		(struct cpufreq_policy *policy);
	int	(*verify)	(struct cpufreq_policy *policy);

	/* define one out of two */
	int	(*setpolicy)	(struct cpufreq_policy *policy);
	int	(*target)	(struct cpufreq_policy *policy,
				 unsigned int target_freq,
				 unsigned int relation);

	/* should be defined, if possible */
	unsigned int	(*get)	(unsigned int cpu);

	/* optional */
	unsigned int (*getavg)	(unsigned int cpu);
	int	(*exit)		(struct cpufreq_policy *policy);
	int	(*suspend)	(struct cpufreq_policy *policy, pm_message_t pmsg);
	int	(*resume)	(struct cpufreq_policy *policy);
	struct freq_attr	**attr;
};

/* flags */

#define CPUFREQ_STICKY		0x01	/* the driver isn't removed even if 
					 * all ->init() calls failed */
#define CPUFREQ_CONST_LOOPS 	0x02	/* loops_per_jiffy or other kernel
					 * "constants" aren't affected by
					 * frequency transitions */
#define CPUFREQ_PM_NO_WARN	0x04	/* don't warn on suspend/resume speed
					 * mismatches */

int cpufreq_register_driver(struct cpufreq_driver *driver_data);
int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);


void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);


static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max) 
{
	if (policy->min < min)
		policy->min = min;
	if (policy->max < min)
		policy->max = min;
	if (policy->min > max)
		policy->min = max;
	if (policy->max > max)
		policy->max = max;
	if (policy->min > policy->max)
		policy->min = policy->max;
	return;
}

struct freq_attr {
	struct attribute attr;
	ssize_t (*show)(struct cpufreq_policy *, char *);
	ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
};


/*********************************************************************
 *                        CPUFREQ 2.6. INTERFACE                     *
 *********************************************************************/
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
int cpufreq_update_policy(unsigned int cpu);

/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
unsigned int cpufreq_get(unsigned int cpu);

/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
#ifdef CONFIG_CPU_FREQ
unsigned int cpufreq_quick_get(unsigned int cpu);
#else
static inline unsigned int cpufreq_quick_get(unsigned int cpu)
{
	return 0;
}
#endif


/*********************************************************************
 *                       CPUFREQ DEFAULT GOVERNOR                    *
 *********************************************************************/


/*
  Performance governor is fallback governor if any other gov failed to
  auto load due latency restrictions
*/
#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
extern struct cpufreq_governor cpufreq_gov_performance;
#endif
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_performance)
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
extern struct cpufreq_governor cpufreq_gov_userspace;
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_userspace)
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
extern struct cpufreq_governor cpufreq_gov_ondemand;
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_ondemand)
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
extern struct cpufreq_governor cpufreq_gov_conservative;
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_conservative)
#endif


/*********************************************************************
 *                     FREQUENCY TABLE HELPERS                       *
 *********************************************************************/

#define CPUFREQ_ENTRY_INVALID ~0
#define CPUFREQ_TABLE_END     ~1

struct cpufreq_frequency_table {
	unsigned int	index;     /* any */
	unsigned int	frequency; /* kHz - doesn't need to be in ascending
				    * order */
};

int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
				    struct cpufreq_frequency_table *table);

int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
				   struct cpufreq_frequency_table *table);

int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
				   struct cpufreq_frequency_table *table,
				   unsigned int target_freq,
				   unsigned int relation,
				   unsigned int *index);

/* the following 3 funtions are for cpufreq core use only */
struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
void   cpufreq_cpu_put (struct cpufreq_policy *data);

/* the following are really really optional */
extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;

void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, 
				      unsigned int cpu);

void cpufreq_frequency_table_put_attr(unsigned int cpu);


/*********************************************************************
 *                     UNIFIED DEBUG HELPERS                         *
 *********************************************************************/

#define CPUFREQ_DEBUG_CORE	1
#define CPUFREQ_DEBUG_DRIVER	2
#define CPUFREQ_DEBUG_GOVERNOR	4

#ifdef CONFIG_CPU_FREQ_DEBUG

extern void cpufreq_debug_printk(unsigned int type, const char *prefix, 
				 const char *fmt, ...);

#else

#define cpufreq_debug_printk(msg...) do { } while(0)

#endif /* CONFIG_CPU_FREQ_DEBUG */

#endif /* _LINUX_CPUFREQ_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/linux/cpufreq.h
	3	*
	4	* Copyright (C) 2001 Russell King
	5	* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
	6	*
	7	*
	8	* $Id: cpufreq.h,v 1.36 2003/01/20 17:31:48 db Exp $
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14	#ifndef _LINUX_CPUFREQ_H
	15	#define _LINUX_CPUFREQ_H
	16
83933af4	17	#include <linux/mutex.h>
1da177e4 LT	18	#include <linux/notifier.h>
	19	#include <linux/threads.h>
	20	#include <linux/device.h>
	21	#include <linux/kobject.h>
	22	#include <linux/sysfs.h>
	23	#include <linux/completion.h>
	24	#include <linux/workqueue.h>
	25	#include <linux/cpumask.h>
4e57b681	26	#include <asm/div64.h>
1da177e4 LT	27
	28	#define CPUFREQ_NAME_LEN 16
	29
	30
	31	/*********************************************************************
	32	* CPUFREQ NOTIFIER INTERFACE *
	33	*********************************************************************/
	34
1da177e4 LT	35	#define CPUFREQ_TRANSITION_NOTIFIER (0)
	36	#define CPUFREQ_POLICY_NOTIFIER (1)
	37
6070b5de SS	38	#ifdef CONFIG_CPU_FREQ
	39	int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
	40	int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
	41	#else /* CONFIG_CPU_FREQ */
	42	static inline int cpufreq_register_notifier(struct notifier_block *nb,
	43	unsigned int list)
	44	{
	45	return 0;
	46	}
	47	static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
	48	unsigned int list)
	49	{
	50	return 0;
	51	}
	52	#endif /* CONFIG_CPU_FREQ */
1da177e4 LT	53
	54	/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
	55	* within the limits is used. If (cpufreq_driver->setpolicy> exists, these
	56	* two generic policies are available:
	57	*/
	58
	59	#define CPUFREQ_POLICY_POWERSAVE (1)
	60	#define CPUFREQ_POLICY_PERFORMANCE (2)
	61
	62	/* Frequency values here are CPU kHz so that hardware which doesn't run
	63	* with some frequencies can complain without having to guess what per
	64	* cent / per mille means.
b53cc6ea	65	* Maximum transition latency is in nanoseconds - if it's unknown,
1da177e4 LT	66	* CPUFREQ_ETERNAL shall be used.
	67	*/
	68
	69	struct cpufreq_governor;
	70
	71	#define CPUFREQ_ETERNAL (-1)
	72	struct cpufreq_cpuinfo {
	73	unsigned int max_freq;
	74	unsigned int min_freq;
	75	unsigned int transition_latency; /* in 10^(-9) s = nanoseconds */
	76	};
	77
	78	struct cpufreq_real_policy {
	79	unsigned int min; /* in kHz */
	80	unsigned int max; /* in kHz */
	81	unsigned int policy; /* see above */
	82	struct cpufreq_governor governor; / see below */
	83	};
	84
	85	struct cpufreq_policy {
	86	cpumask_t cpus; /* affected CPUs */
3b2d9942 VP	87	unsigned int shared_type; /* ANY or ALL affected CPUs
3b2d9942 VP	88	should set cpufreq */
1da177e4 LT	89	unsigned int cpu; /* cpu nr of registered CPU */
	90	struct cpufreq_cpuinfo cpuinfo;/* see above */
	91
	92	unsigned int min; /* in kHz */
	93	unsigned int max; /* in kHz */
	94	unsigned int cur; /* in kHz, only needed if cpufreq
	95	* governors are used */
	96	unsigned int policy; /* see above */
	97	struct cpufreq_governor governor; / see below */
	98
1da177e4 LT	99	struct work_struct update; /* if update_policy() needs to be
	100	* called, but you're in IRQ context */
	101
	102	struct cpufreq_real_policy user_policy;
	103
	104	struct kobject kobj;
	105	struct completion kobj_unregister;
	106	};
	107
	108	#define CPUFREQ_ADJUST (0)
	109	#define CPUFREQ_INCOMPATIBLE (1)
	110	#define CPUFREQ_NOTIFY (2)
	111
46f18e3a VP	112	#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
	113	#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
	114	#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
	115	#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
1da177e4 LT	116
	117	/****************** cpufreq transition notifiers *****************/
	118
	119	#define CPUFREQ_PRECHANGE (0)
	120	#define CPUFREQ_POSTCHANGE (1)
	121	#define CPUFREQ_RESUMECHANGE (8)
42d4dc3f	122	#define CPUFREQ_SUSPENDCHANGE (9)
1da177e4 LT	123
	124	struct cpufreq_freqs {
	125	unsigned int cpu; /* cpu nr */
	126	unsigned int old;
	127	unsigned int new;
	128	u8 flags; /* flags of cpufreq_driver, see below. */
	129	};
	130
	131
	132	/**
	133	* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
	134	* @old: old value
	135	* @div: divisor
	136	* @mult: multiplier
	137	*
	138	*
	139	* new = old * mult / div
	140	*/
	141	static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
	142	{
	143	#if BITS_PER_LONG == 32
	144
	145	u64 result = ((u64) old) * ((u64) mult);
	146	do_div(result, div);
	147	return (unsigned long) result;
	148
	149	#elif BITS_PER_LONG == 64
	150
	151	unsigned long result = old * ((u64) mult);
	152	result /= div;
	153	return result;
	154
	155	#endif
	156	};
	157
	158	/*********************************************************************
	159	* CPUFREQ GOVERNORS *
	160	*********************************************************************/
	161
	162	#define CPUFREQ_GOV_START 1
	163	#define CPUFREQ_GOV_STOP 2
	164	#define CPUFREQ_GOV_LIMITS 3
	165
	166	struct cpufreq_governor {
	167	char name[CPUFREQ_NAME_LEN];
	168	int (governor) (struct cpufreq_policy policy,
	169	unsigned int event);
9e76988e VP	170	ssize_t (show_setspeed) (struct cpufreq_policy policy,
	171	char *buf);
	172	int (store_setspeed) (struct cpufreq_policy policy,
	173	unsigned int freq);
1c256245 TR	174	unsigned int max_transition_latency; /* HW must be able to switch to
	175	next freq faster than this value in nano secs or we
	176	will fallback to performance governor */
1da177e4 LT	177	struct list_head governor_list;
	178	struct module *owner;
	179	};
	180
	181	/* pass a target to the cpufreq driver
	182	*/
	183	extern int cpufreq_driver_target(struct cpufreq_policy *policy,
	184	unsigned int target_freq,
	185	unsigned int relation);
	186	extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
	187	unsigned int target_freq,
	188	unsigned int relation);
	189
	190
5a01f2e8	191	extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy);
dfde5d62	192
1da177e4 LT	193	int cpufreq_register_governor(struct cpufreq_governor *governor);
	194	void cpufreq_unregister_governor(struct cpufreq_governor *governor);
	195
5a01f2e8 VP	196	int lock_policy_rwsem_read(int cpu);
	197	int lock_policy_rwsem_write(int cpu);
	198	void unlock_policy_rwsem_read(int cpu);
	199	void unlock_policy_rwsem_write(int cpu);
	200
1da177e4 LT	201
	202	/*********************************************************************
	203	* CPUFREQ DRIVER INTERFACE *
	204	*********************************************************************/
	205
	206	#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
	207	#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
	208
	209	struct freq_attr;
	210
	211	struct cpufreq_driver {
	212	struct module *owner;
	213	char name[CPUFREQ_NAME_LEN];
	214	u8 flags;
	215
	216	/* needed by all drivers */
	217	int (init) (struct cpufreq_policy policy);
	218	int (verify) (struct cpufreq_policy policy);
	219
	220	/* define one out of two */
	221	int (setpolicy) (struct cpufreq_policy policy);
	222	int (target) (struct cpufreq_policy policy,
	223	unsigned int target_freq,
	224	unsigned int relation);
	225
	226	/* should be defined, if possible */
	227	unsigned int (*get) (unsigned int cpu);
	228
	229	/* optional */
dfde5d62	230	unsigned int (*getavg) (unsigned int cpu);
1da177e4	231	int (exit) (struct cpufreq_policy policy);
e00d9967	232	int (suspend) (struct cpufreq_policy policy, pm_message_t pmsg);
1da177e4 LT	233	int (resume) (struct cpufreq_policy policy);
	234	struct freq_attr **attr;
	235	};
	236
	237	/* flags */
	238
	239	#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
	240	* all ->init() calls failed */
	241	#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
	242	* "constants" aren't affected by
	243	* frequency transitions */
42d4dc3f BH	244	#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
42d4dc3f BH	245	* mismatches */
1da177e4	246
221dee28 LT	247	int cpufreq_register_driver(struct cpufreq_driver *driver_data);
221dee28 LT	248	int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
1da177e4 LT	249
	250
	251	void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
	252
	253
	254	static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
	255	{
	256	if (policy->min < min)
	257	policy->min = min;
	258	if (policy->max < min)
	259	policy->max = min;
	260	if (policy->min > max)
	261	policy->min = max;
	262	if (policy->max > max)
	263	policy->max = max;
	264	if (policy->min > policy->max)
	265	policy->min = policy->max;
	266	return;
	267	}
	268
	269	struct freq_attr {
	270	struct attribute attr;
	271	ssize_t (show)(struct cpufreq_policy , char *);
	272	ssize_t (store)(struct cpufreq_policy , const char *, size_t count);
	273	};
	274
	275
	276	/*********************************************************************
	277	* CPUFREQ 2.6. INTERFACE *
	278	*********************************************************************/
1da177e4 LT	279	int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
	280	int cpufreq_update_policy(unsigned int cpu);
	281
ff0ce684 LT	282	/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
ff0ce684 LT	283	unsigned int cpufreq_get(unsigned int cpu);
1da177e4	284
ff0ce684	285	/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
95235ca2 VP	286	#ifdef CONFIG_CPU_FREQ
	287	unsigned int cpufreq_quick_get(unsigned int cpu);
	288	#else
	289	static inline unsigned int cpufreq_quick_get(unsigned int cpu)
	290	{
	291	return 0;
	292	}
	293	#endif
	294
1da177e4 LT	295
	296	/*********************************************************************
	297	* CPUFREQ DEFAULT GOVERNOR *
	298	*********************************************************************/
	299
	300
1c256245 TR	301	/*
	302	Performance governor is fallback governor if any other gov failed to
	303	auto load due latency restrictions
	304	*/
6afde10c	305	#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
1da177e4	306	extern struct cpufreq_governor cpufreq_gov_performance;
6afde10c	307	#endif
1c256245 TR	308	#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
1c256245 TR	309	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
1da177e4 LT	310	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
1da177e4 LT	311	extern struct cpufreq_governor cpufreq_gov_userspace;
1c256245 TR	312	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
	313	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
	314	extern struct cpufreq_governor cpufreq_gov_ondemand;
	315	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
	316	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
	317	extern struct cpufreq_governor cpufreq_gov_conservative;
	318	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
1da177e4 LT	319	#endif
	320
	321
	322	/*********************************************************************
	323	* FREQUENCY TABLE HELPERS *
	324	*********************************************************************/
	325
	326	#define CPUFREQ_ENTRY_INVALID ~0
	327	#define CPUFREQ_TABLE_END ~1
	328
	329	struct cpufreq_frequency_table {
	330	unsigned int index; /* any */
	331	unsigned int frequency; /* kHz - doesn't need to be in ascending
	332	* order */
	333	};
	334
	335	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	336	struct cpufreq_frequency_table *table);
	337
	338	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	339	struct cpufreq_frequency_table *table);
	340
	341	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	342	struct cpufreq_frequency_table *table,
	343	unsigned int target_freq,
	344	unsigned int relation,
	345	unsigned int *index);
	346
	347	/* the following 3 funtions are for cpufreq core use only */
	348	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
	349	struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
	350	void cpufreq_cpu_put (struct cpufreq_policy *data);
	351
	352	/* the following are really really optional */
	353	extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
	354
	355	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
	356	unsigned int cpu);
	357
	358	void cpufreq_frequency_table_put_attr(unsigned int cpu);
	359
	360
	361	/*********************************************************************
	362	* UNIFIED DEBUG HELPERS *
	363	*********************************************************************/
	364
	365	#define CPUFREQ_DEBUG_CORE 1
	366	#define CPUFREQ_DEBUG_DRIVER 2
	367	#define CPUFREQ_DEBUG_GOVERNOR 4
	368
	369	#ifdef CONFIG_CPU_FREQ_DEBUG
	370
	371	extern void cpufreq_debug_printk(unsigned int type, const char *prefix,
	372	const char *fmt, ...);
	373
	374	#else
	375
	376	#define cpufreq_debug_printk(msg...) do { } while(0)
	377
	378	#endif /* CONFIG_CPU_FREQ_DEBUG */
	379
	380	#endif /* _LINUX_CPUFREQ_H */