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

/*
 *  linux/include/linux/cpufreq.h
 *
 *  Copyright (C) 2001 Russell King
 *            (C) 2002 - 2003 Dominik Brodowski <[email protected]>
 *            
 *
 * $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                    *
 *********************************************************************/

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

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


/* 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);
	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 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);
unsigned int cpufreq_get(unsigned int cpu);
#else
static inline unsigned int cpufreq_quick_get(unsigned int cpu)
{
	return 0;
}
static inline unsigned int cpufreq_get(unsigned int cpu)
{
	return 0;
}
#endif


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


#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
extern struct cpufreq_governor cpufreq_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
#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 <[email protected]>
	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
184c44d2	35	#ifdef CONFIG_CPU_FREQ
1da177e4	36	int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
184c44d2 AM	37	#else
	38	static inline int cpufreq_register_notifier(struct notifier_block *nb,
	39	unsigned int list)
	40	{
	41	return 0;
	42	}
	43	#endif
1da177e4 LT	44	int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
	45
	46	#define CPUFREQ_TRANSITION_NOTIFIER (0)
	47	#define CPUFREQ_POLICY_NOTIFIER (1)
	48
	49
	50	/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
	51	* within the limits is used. If (cpufreq_driver->setpolicy> exists, these
	52	* two generic policies are available:
	53	*/
	54
	55	#define CPUFREQ_POLICY_POWERSAVE (1)
	56	#define CPUFREQ_POLICY_PERFORMANCE (2)
	57
	58	/* Frequency values here are CPU kHz so that hardware which doesn't run
	59	* with some frequencies can complain without having to guess what per
	60	* cent / per mille means.
b53cc6ea	61	* Maximum transition latency is in nanoseconds - if it's unknown,
1da177e4 LT	62	* CPUFREQ_ETERNAL shall be used.
	63	*/
	64
	65	struct cpufreq_governor;
	66
	67	#define CPUFREQ_ETERNAL (-1)
	68	struct cpufreq_cpuinfo {
	69	unsigned int max_freq;
	70	unsigned int min_freq;
	71	unsigned int transition_latency; /* in 10^(-9) s = nanoseconds */
	72	};
	73
	74	struct cpufreq_real_policy {
	75	unsigned int min; /* in kHz */
	76	unsigned int max; /* in kHz */
	77	unsigned int policy; /* see above */
	78	struct cpufreq_governor governor; / see below */
	79	};
	80
	81	struct cpufreq_policy {
	82	cpumask_t cpus; /* affected CPUs */
3b2d9942 VP	83	unsigned int shared_type; /* ANY or ALL affected CPUs
3b2d9942 VP	84	should set cpufreq */
1da177e4 LT	85	unsigned int cpu; /* cpu nr of registered CPU */
	86	struct cpufreq_cpuinfo cpuinfo;/* see above */
	87
	88	unsigned int min; /* in kHz */
	89	unsigned int max; /* in kHz */
	90	unsigned int cur; /* in kHz, only needed if cpufreq
	91	* governors are used */
	92	unsigned int policy; /* see above */
	93	struct cpufreq_governor governor; / see below */
	94
1da177e4 LT	95	struct work_struct update; /* if update_policy() needs to be
	96	* called, but you're in IRQ context */
	97
	98	struct cpufreq_real_policy user_policy;
	99
	100	struct kobject kobj;
	101	struct completion kobj_unregister;
	102	};
	103
	104	#define CPUFREQ_ADJUST (0)
	105	#define CPUFREQ_INCOMPATIBLE (1)
	106	#define CPUFREQ_NOTIFY (2)
	107
46f18e3a VP	108	#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
	109	#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
	110	#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
	111	#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
1da177e4 LT	112
	113	/****************** cpufreq transition notifiers *****************/
	114
	115	#define CPUFREQ_PRECHANGE (0)
	116	#define CPUFREQ_POSTCHANGE (1)
	117	#define CPUFREQ_RESUMECHANGE (8)
42d4dc3f	118	#define CPUFREQ_SUSPENDCHANGE (9)
1da177e4 LT	119
	120	struct cpufreq_freqs {
	121	unsigned int cpu; /* cpu nr */
	122	unsigned int old;
	123	unsigned int new;
	124	u8 flags; /* flags of cpufreq_driver, see below. */
	125	};
	126
	127
	128	/**
	129	* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
	130	* @old: old value
	131	* @div: divisor
	132	* @mult: multiplier
	133	*
	134	*
	135	* new = old * mult / div
	136	*/
	137	static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
	138	{
	139	#if BITS_PER_LONG == 32
	140
	141	u64 result = ((u64) old) * ((u64) mult);
	142	do_div(result, div);
	143	return (unsigned long) result;
	144
	145	#elif BITS_PER_LONG == 64
	146
	147	unsigned long result = old * ((u64) mult);
	148	result /= div;
	149	return result;
	150
	151	#endif
	152	};
	153
	154	/*********************************************************************
	155	* CPUFREQ GOVERNORS *
	156	*********************************************************************/
	157
	158	#define CPUFREQ_GOV_START 1
	159	#define CPUFREQ_GOV_STOP 2
	160	#define CPUFREQ_GOV_LIMITS 3
	161
	162	struct cpufreq_governor {
	163	char name[CPUFREQ_NAME_LEN];
	164	int (governor) (struct cpufreq_policy policy,
	165	unsigned int event);
	166	struct list_head governor_list;
	167	struct module *owner;
	168	};
	169
	170	/* pass a target to the cpufreq driver
	171	*/
	172	extern int cpufreq_driver_target(struct cpufreq_policy *policy,
	173	unsigned int target_freq,
	174	unsigned int relation);
	175	extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
	176	unsigned int target_freq,
	177	unsigned int relation);
	178
	179
5a01f2e8	180	extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy);
dfde5d62	181
1da177e4 LT	182	int cpufreq_register_governor(struct cpufreq_governor *governor);
	183	void cpufreq_unregister_governor(struct cpufreq_governor *governor);
	184
5a01f2e8 VP	185	int lock_policy_rwsem_read(int cpu);
	186	int lock_policy_rwsem_write(int cpu);
	187	void unlock_policy_rwsem_read(int cpu);
	188	void unlock_policy_rwsem_write(int cpu);
	189
1da177e4 LT	190
	191	/*********************************************************************
	192	* CPUFREQ DRIVER INTERFACE *
	193	*********************************************************************/
	194
	195	#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
	196	#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
	197
	198	struct freq_attr;
	199
	200	struct cpufreq_driver {
	201	struct module *owner;
	202	char name[CPUFREQ_NAME_LEN];
	203	u8 flags;
	204
	205	/* needed by all drivers */
	206	int (init) (struct cpufreq_policy policy);
	207	int (verify) (struct cpufreq_policy policy);
	208
	209	/* define one out of two */
	210	int (setpolicy) (struct cpufreq_policy policy);
	211	int (target) (struct cpufreq_policy policy,
	212	unsigned int target_freq,
	213	unsigned int relation);
	214
	215	/* should be defined, if possible */
	216	unsigned int (*get) (unsigned int cpu);
	217
	218	/* optional */
dfde5d62	219	unsigned int (*getavg) (unsigned int cpu);
1da177e4	220	int (exit) (struct cpufreq_policy policy);
e00d9967	221	int (suspend) (struct cpufreq_policy policy, pm_message_t pmsg);
1da177e4 LT	222	int (resume) (struct cpufreq_policy policy);
	223	struct freq_attr **attr;
	224	};
	225
	226	/* flags */
	227
	228	#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
	229	* all ->init() calls failed */
	230	#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
	231	* "constants" aren't affected by
	232	* frequency transitions */
42d4dc3f BH	233	#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
42d4dc3f BH	234	* mismatches */
1da177e4	235
221dee28 LT	236	int cpufreq_register_driver(struct cpufreq_driver *driver_data);
221dee28 LT	237	int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
1da177e4 LT	238
	239
	240	void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
	241
	242
	243	static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
	244	{
	245	if (policy->min < min)
	246	policy->min = min;
	247	if (policy->max < min)
	248	policy->max = min;
	249	if (policy->min > max)
	250	policy->min = max;
	251	if (policy->max > max)
	252	policy->max = max;
	253	if (policy->min > policy->max)
	254	policy->min = policy->max;
	255	return;
	256	}
	257
	258	struct freq_attr {
	259	struct attribute attr;
	260	ssize_t (show)(struct cpufreq_policy , char *);
	261	ssize_t (store)(struct cpufreq_policy , const char *, size_t count);
	262	};
	263
	264
	265	/*********************************************************************
	266	* CPUFREQ 2.6. INTERFACE *
	267	*********************************************************************/
1da177e4 LT	268	int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
	269	int cpufreq_update_policy(unsigned int cpu);
	270
1da177e4	271
184c44d2 AM	272	/*
	273	* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it
	274	*/
95235ca2 VP	275	#ifdef CONFIG_CPU_FREQ
95235ca2 VP	276	unsigned int cpufreq_quick_get(unsigned int cpu);
184c44d2	277	unsigned int cpufreq_get(unsigned int cpu);
95235ca2 VP	278	#else
	279	static inline unsigned int cpufreq_quick_get(unsigned int cpu)
	280	{
	281	return 0;
	282	}
184c44d2 AM	283	static inline unsigned int cpufreq_get(unsigned int cpu)
	284	{
	285	return 0;
	286	}
95235ca2 VP	287	#endif
95235ca2 VP	288
1da177e4 LT	289
	290	/*********************************************************************
	291	* CPUFREQ DEFAULT GOVERNOR *
	292	*********************************************************************/
	293
	294
	295	#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
	296	extern struct cpufreq_governor cpufreq_gov_performance;
	297	#define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_performance
	298	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
	299	extern struct cpufreq_governor cpufreq_gov_userspace;
	300	#define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_userspace
	301	#endif
	302
	303
	304	/*********************************************************************
	305	* FREQUENCY TABLE HELPERS *
	306	*********************************************************************/
	307
	308	#define CPUFREQ_ENTRY_INVALID ~0
	309	#define CPUFREQ_TABLE_END ~1
	310
	311	struct cpufreq_frequency_table {
	312	unsigned int index; /* any */
	313	unsigned int frequency; /* kHz - doesn't need to be in ascending
	314	* order */
	315	};
	316
	317	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	318	struct cpufreq_frequency_table *table);
	319
	320	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	321	struct cpufreq_frequency_table *table);
	322
	323	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	324	struct cpufreq_frequency_table *table,
	325	unsigned int target_freq,
	326	unsigned int relation,
	327	unsigned int *index);
	328
	329	/* the following 3 funtions are for cpufreq core use only */
	330	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
	331	struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
	332	void cpufreq_cpu_put (struct cpufreq_policy *data);
	333
	334	/* the following are really really optional */
	335	extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
	336
	337	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
	338	unsigned int cpu);
	339
	340	void cpufreq_frequency_table_put_attr(unsigned int cpu);
	341
	342
	343	/*********************************************************************
	344	* UNIFIED DEBUG HELPERS *
	345	*********************************************************************/
	346
	347	#define CPUFREQ_DEBUG_CORE 1
	348	#define CPUFREQ_DEBUG_DRIVER 2
	349	#define CPUFREQ_DEBUG_GOVERNOR 4
	350
	351	#ifdef CONFIG_CPU_FREQ_DEBUG
	352
353	extern void cpufreq_debug_printk(unsigned int type, const char *prefix,
354	const char *fmt, ...);
355
356	#else
357
358	#define cpufreq_debug_printk(msg...) do { } while(0)
359
360	#endif /* CONFIG_CPU_FREQ_DEBUG */
361
362	#endif /* _LINUX_CPUFREQ_H */