[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>
 *            
 * 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;	/* CPUs requiring sw coordination */
	cpumask_t		related_cpus; /* CPUs with any coordination */
	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_START		(3)

#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,
				   unsigned int cpu);

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)	(struct cpufreq_policy *policy,
				 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;
	bool			hide_interface;
};

/* 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_POWERSAVE)
extern struct cpufreq_governor cpufreq_gov_powersave;
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_powersave)
#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	*
1da177e4 LT	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#ifndef _LINUX_CPUFREQ_H
	12	#define _LINUX_CPUFREQ_H
	13
83933af4	14	#include <linux/mutex.h>
1da177e4 LT	15	#include <linux/notifier.h>
	16	#include <linux/threads.h>
	17	#include <linux/device.h>
	18	#include <linux/kobject.h>
	19	#include <linux/sysfs.h>
	20	#include <linux/completion.h>
	21	#include <linux/workqueue.h>
	22	#include <linux/cpumask.h>
4e57b681	23	#include <asm/div64.h>
1da177e4 LT	24
	25	#define CPUFREQ_NAME_LEN 16
	26
	27
	28	/*********************************************************************
	29	* CPUFREQ NOTIFIER INTERFACE *
	30	*********************************************************************/
	31
1da177e4 LT	32	#define CPUFREQ_TRANSITION_NOTIFIER (0)
	33	#define CPUFREQ_POLICY_NOTIFIER (1)
	34
6070b5de SS	35	#ifdef CONFIG_CPU_FREQ
	36	int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
	37	int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
	38	#else /* CONFIG_CPU_FREQ */
	39	static inline int cpufreq_register_notifier(struct notifier_block *nb,
	40	unsigned int list)
	41	{
	42	return 0;
	43	}
	44	static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
	45	unsigned int list)
	46	{
	47	return 0;
	48	}
	49	#endif /* CONFIG_CPU_FREQ */
1da177e4 LT	50
	51	/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
	52	* within the limits is used. If (cpufreq_driver->setpolicy> exists, these
	53	* two generic policies are available:
	54	*/
	55
	56	#define CPUFREQ_POLICY_POWERSAVE (1)
	57	#define CPUFREQ_POLICY_PERFORMANCE (2)
	58
	59	/* Frequency values here are CPU kHz so that hardware which doesn't run
	60	* with some frequencies can complain without having to guess what per
	61	* cent / per mille means.
b53cc6ea	62	* Maximum transition latency is in nanoseconds - if it's unknown,
1da177e4 LT	63	* CPUFREQ_ETERNAL shall be used.
	64	*/
	65
	66	struct cpufreq_governor;
	67
	68	#define CPUFREQ_ETERNAL (-1)
	69	struct cpufreq_cpuinfo {
	70	unsigned int max_freq;
	71	unsigned int min_freq;
	72	unsigned int transition_latency; /* in 10^(-9) s = nanoseconds */
	73	};
	74
	75	struct cpufreq_real_policy {
	76	unsigned int min; /* in kHz */
	77	unsigned int max; /* in kHz */
	78	unsigned int policy; /* see above */
	79	struct cpufreq_governor governor; / see below */
	80	};
	81
	82	struct cpufreq_policy {
e8628dd0 DW	83	cpumask_t cpus; /* CPUs requiring sw coordination */
e8628dd0 DW	84	cpumask_t related_cpus; /* CPUs with any coordination */
3b2d9942 VP	85	unsigned int shared_type; /* ANY or ALL affected CPUs
3b2d9942 VP	86	should set cpufreq */
1da177e4 LT	87	unsigned int cpu; /* cpu nr of registered CPU */
	88	struct cpufreq_cpuinfo cpuinfo;/* see above */
	89
	90	unsigned int min; /* in kHz */
	91	unsigned int max; /* in kHz */
	92	unsigned int cur; /* in kHz, only needed if cpufreq
	93	* governors are used */
	94	unsigned int policy; /* see above */
	95	struct cpufreq_governor governor; / see below */
	96
1da177e4 LT	97	struct work_struct update; /* if update_policy() needs to be
	98	* called, but you're in IRQ context */
	99
	100	struct cpufreq_real_policy user_policy;
	101
	102	struct kobject kobj;
	103	struct completion kobj_unregister;
	104	};
	105
	106	#define CPUFREQ_ADJUST (0)
	107	#define CPUFREQ_INCOMPATIBLE (1)
	108	#define CPUFREQ_NOTIFY (2)
a1531acd	109	#define CPUFREQ_START (3)
1da177e4	110
46f18e3a VP	111	#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
	112	#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
	113	#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
	114	#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
1da177e4 LT	115
	116	/****************** cpufreq transition notifiers *****************/
	117
	118	#define CPUFREQ_PRECHANGE (0)
	119	#define CPUFREQ_POSTCHANGE (1)
	120	#define CPUFREQ_RESUMECHANGE (8)
42d4dc3f	121	#define CPUFREQ_SUSPENDCHANGE (9)
1da177e4 LT	122
	123	struct cpufreq_freqs {
	124	unsigned int cpu; /* cpu nr */
	125	unsigned int old;
	126	unsigned int new;
	127	u8 flags; /* flags of cpufreq_driver, see below. */
	128	};
	129
	130
	131	/**
	132	* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
	133	* @old: old value
	134	* @div: divisor
	135	* @mult: multiplier
	136	*
	137	*
	138	* new = old * mult / div
	139	*/
	140	static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
	141	{
	142	#if BITS_PER_LONG == 32
	143
	144	u64 result = ((u64) old) * ((u64) mult);
	145	do_div(result, div);
	146	return (unsigned long) result;
	147
	148	#elif BITS_PER_LONG == 64
	149
	150	unsigned long result = old * ((u64) mult);
	151	result /= div;
	152	return result;
	153
	154	#endif
	155	};
	156
	157	/*********************************************************************
	158	* CPUFREQ GOVERNORS *
	159	*********************************************************************/
	160
	161	#define CPUFREQ_GOV_START 1
	162	#define CPUFREQ_GOV_STOP 2
	163	#define CPUFREQ_GOV_LIMITS 3
	164
	165	struct cpufreq_governor {
	166	char name[CPUFREQ_NAME_LEN];
	167	int (governor) (struct cpufreq_policy policy,
	168	unsigned int event);
9e76988e VP	169	ssize_t (show_setspeed) (struct cpufreq_policy policy,
	170	char *buf);
	171	int (store_setspeed) (struct cpufreq_policy policy,
	172	unsigned int freq);
1c256245 TR	173	unsigned int max_transition_latency; /* HW must be able to switch to
	174	next freq faster than this value in nano secs or we
	175	will fallback to performance governor */
1da177e4 LT	176	struct list_head governor_list;
	177	struct module *owner;
	178	};
	179
	180	/* pass a target to the cpufreq driver
	181	*/
	182	extern int cpufreq_driver_target(struct cpufreq_policy *policy,
	183	unsigned int target_freq,
	184	unsigned int relation);
	185	extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
	186	unsigned int target_freq,
	187	unsigned int relation);
	188
	189
bf0b90e3	190	extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
bf0b90e3	191	unsigned int cpu);
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 */
bf0b90e3	230	unsigned int (getavg) (struct cpufreq_policy policy,
	231	unsigned int cpu);
	232
1da177e4	233	int (exit) (struct cpufreq_policy policy);
e00d9967	234	int (suspend) (struct cpufreq_policy policy, pm_message_t pmsg);
1da177e4 LT	235	int (resume) (struct cpufreq_policy policy);
1da177e4 LT	236	struct freq_attr **attr;
e088e4c9	237	bool hide_interface;
1da177e4 LT	238	};
	239
	240	/* flags */
	241
	242	#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
	243	* all ->init() calls failed */
	244	#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
	245	* "constants" aren't affected by
	246	* frequency transitions */
42d4dc3f BH	247	#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
42d4dc3f BH	248	* mismatches */
1da177e4	249
221dee28 LT	250	int cpufreq_register_driver(struct cpufreq_driver *driver_data);
221dee28 LT	251	int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
1da177e4 LT	252
	253
	254	void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
	255
	256
	257	static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
	258	{
	259	if (policy->min < min)
	260	policy->min = min;
	261	if (policy->max < min)
	262	policy->max = min;
	263	if (policy->min > max)
	264	policy->min = max;
	265	if (policy->max > max)
	266	policy->max = max;
	267	if (policy->min > policy->max)
	268	policy->min = policy->max;
	269	return;
	270	}
	271
	272	struct freq_attr {
	273	struct attribute attr;
	274	ssize_t (show)(struct cpufreq_policy , char *);
	275	ssize_t (store)(struct cpufreq_policy , const char *, size_t count);
	276	};
	277
	278
	279	/*********************************************************************
	280	* CPUFREQ 2.6. INTERFACE *
	281	*********************************************************************/
1da177e4 LT	282	int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
	283	int cpufreq_update_policy(unsigned int cpu);
	284
ff0ce684 LT	285	/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
ff0ce684 LT	286	unsigned int cpufreq_get(unsigned int cpu);
1da177e4	287
ff0ce684	288	/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
95235ca2 VP	289	#ifdef CONFIG_CPU_FREQ
	290	unsigned int cpufreq_quick_get(unsigned int cpu);
	291	#else
	292	static inline unsigned int cpufreq_quick_get(unsigned int cpu)
	293	{
	294	return 0;
	295	}
	296	#endif
	297
1da177e4 LT	298
	299	/*********************************************************************
	300	* CPUFREQ DEFAULT GOVERNOR *
	301	*********************************************************************/
	302
	303
1c256245 TR	304	/*
	305	Performance governor is fallback governor if any other gov failed to
	306	auto load due latency restrictions
	307	*/
6afde10c	308	#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
1da177e4	309	extern struct cpufreq_governor cpufreq_gov_performance;
6afde10c	310	#endif
1c256245 TR	311	#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
1c256245 TR	312	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
30d221db AG	313	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
	314	extern struct cpufreq_governor cpufreq_gov_powersave;
	315	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
1da177e4 LT	316	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
1da177e4 LT	317	extern struct cpufreq_governor cpufreq_gov_userspace;
1c256245 TR	318	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
	319	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
	320	extern struct cpufreq_governor cpufreq_gov_ondemand;
	321	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
	322	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
	323	extern struct cpufreq_governor cpufreq_gov_conservative;
	324	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
1da177e4 LT	325	#endif
	326
	327
	328	/*********************************************************************
	329	* FREQUENCY TABLE HELPERS *
	330	*********************************************************************/
	331
	332	#define CPUFREQ_ENTRY_INVALID ~0
	333	#define CPUFREQ_TABLE_END ~1
	334
	335	struct cpufreq_frequency_table {
	336	unsigned int index; /* any */
	337	unsigned int frequency; /* kHz - doesn't need to be in ascending
	338	* order */
	339	};
	340
	341	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	342	struct cpufreq_frequency_table *table);
	343
	344	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	345	struct cpufreq_frequency_table *table);
	346
	347	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	348	struct cpufreq_frequency_table *table,
	349	unsigned int target_freq,
	350	unsigned int relation,
	351	unsigned int *index);
	352
	353	/* the following 3 funtions are for cpufreq core use only */
	354	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
	355	struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
	356	void cpufreq_cpu_put (struct cpufreq_policy *data);
	357
	358	/* the following are really really optional */
	359	extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
	360
	361	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
	362	unsigned int cpu);
	363
	364	void cpufreq_frequency_table_put_attr(unsigned int cpu);
	365
	366
	367	/*********************************************************************
	368	* UNIFIED DEBUG HELPERS *
	369	*********************************************************************/
	370
	371	#define CPUFREQ_DEBUG_CORE 1
	372	#define CPUFREQ_DEBUG_DRIVER 2
	373	#define CPUFREQ_DEBUG_GOVERNOR 4
	374
	375	#ifdef CONFIG_CPU_FREQ_DEBUG
	376
	377	extern void cpufreq_debug_printk(unsigned int type, const char *prefix,
	378	const char *fmt, ...);
	379
	380	#else
	381
	382	#define cpufreq_debug_printk(msg...) do { } while(0)
	383
	384	#endif /* CONFIG_CPU_FREQ_DEBUG */
	385
	386	#endif /* _LINUX_CPUFREQ_H */