[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 <asm/cputime.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/threads.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
/* Print length for names. Extra 1 space for accomodating '\n' in prints */
#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)


/*********************************************************************
 *                     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);
extern void disable_cpufreq(void);
#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;
}
static inline void disable_cpufreq(void) { }
#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;

/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
extern struct kobject *cpufreq_global_kobject;

#define CPUFREQ_ETERNAL			(-1)
struct cpufreq_cpuinfo {
	unsigned int		max_freq;
	unsigned int		min_freq;

	/* in 10^(-9) s = nanoseconds */
	unsigned int		transition_latency;
};

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 {
	/* CPUs sharing clock, require sw coordination */
	cpumask_var_t		cpus;	/* Online CPUs only */
	cpumask_var_t		related_cpus; /* Online + Offline CPUs */

	unsigned int		shared_type; /* ACPI: ANY or ALL affected CPUs
						should set cpufreq */
	unsigned int		cpu;    /* cpu nr of CPU managing this policy */
	unsigned int		last_cpu; /* cpu nr of previous CPU that managed
					   * this policy */
	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 */
	void			*governor_data;

	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_UPDATE_POLICY_CPU	(4)

/* Only for ACPI */
#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*/

static inline bool policy_is_shared(struct cpufreq_policy *policy)
{
	return cpumask_weight(policy->cpus) > 1;
}

/******************** 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
#define CPUFREQ_GOV_POLICY_INIT	4
#define CPUFREQ_GOV_POLICY_EXIT	5

struct cpufreq_governor {
	char	name[CPUFREQ_NAME_LEN];
	int	initialized;
	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);


/*********************************************************************
 *                      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;
	/*
	 * This should be set by platforms having multiple clock-domains, i.e.
	 * supporting multiple policies. With this sysfs directories of governor
	 * would be created in cpu/cpu<num>/cpufreq/ directory and so they can
	 * use the same governor with different tunables for different clusters.
	 */
	bool			have_governor_per_policy;

	/* 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	(*bios_limit)	(int cpu, unsigned int *limit);

	int	(*exit)		(struct cpufreq_policy *policy);
	int	(*suspend)	(struct cpufreq_policy *policy);
	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);
};

#define cpufreq_freq_attr_ro(_name)		\
static struct freq_attr _name =			\
__ATTR(_name, 0444, show_##_name, NULL)

#define cpufreq_freq_attr_ro_perm(_name, _perm)	\
static struct freq_attr _name =			\
__ATTR(_name, _perm, show_##_name, NULL)

#define cpufreq_freq_attr_rw(_name)		\
static struct freq_attr _name =			\
__ATTR(_name, 0644, show_##_name, store_##_name)

struct global_attr {
	struct attribute attr;
	ssize_t (*show)(struct kobject *kobj,
			struct attribute *attr, char *buf);
	ssize_t (*store)(struct kobject *a, struct attribute *b,
			 const char *c, size_t count);
};

#define define_one_global_ro(_name)		\
static struct global_attr _name =		\
__ATTR(_name, 0444, show_##_name, NULL)

#define define_one_global_rw(_name)		\
static struct global_attr _name =		\
__ATTR(_name, 0644, show_##_name, store_##_name)

struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
void cpufreq_cpu_put(struct cpufreq_policy *data);
const char *cpufreq_get_current_driver(void);

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

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

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

/* 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_update_policy_cpu(struct cpufreq_policy *policy);

void cpufreq_frequency_table_put_attr(unsigned int cpu);
#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>
335dc333	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
2aacdfff	14	#include <asm/cputime.h>
83933af4	15	#include <linux/mutex.h>
1da177e4 LT	16	#include <linux/notifier.h>
1da177e4 LT	17	#include <linux/threads.h>
1da177e4 LT	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
1da177e4 LT	25	#define CPUFREQ_NAME_LEN 16
4b972f0b	26	/* Print length for names. Extra 1 space for accomodating '\n' in prints */
4b972f0b	27	#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
1da177e4 LT	28
	29
	30	/*********************************************************************
	31	* CPUFREQ NOTIFIER INTERFACE *
	32	*********************************************************************/
	33
1da177e4 LT	34	#define CPUFREQ_TRANSITION_NOTIFIER (0)
	35	#define CPUFREQ_POLICY_NOTIFIER (1)
	36
6070b5de SS	37	#ifdef CONFIG_CPU_FREQ
	38	int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
	39	int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
a7b422cd	40	extern void disable_cpufreq(void);
6070b5de SS	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	}
a7b422cd	52	static inline void disable_cpufreq(void) { }
6070b5de	53	#endif /* CONFIG_CPU_FREQ */
1da177e4 LT	54
	55	/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
	56	* within the limits is used. If (cpufreq_driver->setpolicy> exists, these
	57	* two generic policies are available:
	58	*/
	59
	60	#define CPUFREQ_POLICY_POWERSAVE (1)
	61	#define CPUFREQ_POLICY_PERFORMANCE (2)
	62
335dc333 TF	63	/* Frequency values here are CPU kHz so that hardware which doesn't run
	64	* with some frequencies can complain without having to guess what per
	65	* cent / per mille means.
b53cc6ea	66	* Maximum transition latency is in nanoseconds - if it's unknown,
1da177e4 LT	67	* CPUFREQ_ETERNAL shall be used.
	68	*/
	69
	70	struct cpufreq_governor;
	71
8aa84ad8 TR	72	/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
	73	extern struct kobject *cpufreq_global_kobject;
	74
1da177e4 LT	75	#define CPUFREQ_ETERNAL (-1)
	76	struct cpufreq_cpuinfo {
	77	unsigned int max_freq;
	78	unsigned int min_freq;
335dc333 TF	79
	80	/* in 10^(-9) s = nanoseconds */
	81	unsigned int transition_latency;
1da177e4 LT	82	};
	83
	84	struct cpufreq_real_policy {
	85	unsigned int min; /* in kHz */
	86	unsigned int max; /* in kHz */
335dc333	87	unsigned int policy; /* see above */
1da177e4 LT	88	struct cpufreq_governor governor; / see below */
	89	};
	90
	91	struct cpufreq_policy {
951fc5f4 VK	92	/* CPUs sharing clock, require sw coordination */
	93	cpumask_var_t cpus; /* Online CPUs only */
	94	cpumask_var_t related_cpus; /* Online + Offline CPUs */
	95
62b36cc1	96	unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
3b2d9942	97	should set cpufreq */
b8eed8af VK	98	unsigned int cpu; /* cpu nr of CPU managing this policy */
	99	unsigned int last_cpu; /* cpu nr of previous CPU that managed
	100	* this policy */
1da177e4 LT	101	struct cpufreq_cpuinfo cpuinfo;/* see above */
	102
	103	unsigned int min; /* in kHz */
	104	unsigned int max; /* in kHz */
	105	unsigned int cur; /* in kHz, only needed if cpufreq
	106	* governors are used */
335dc333	107	unsigned int policy; /* see above */
1da177e4	108	struct cpufreq_governor governor; / see below */
7bd353a9	109	void *governor_data;
1da177e4	110
1da177e4 LT	111	struct work_struct update; /* if update_policy() needs to be
	112	* called, but you're in IRQ context */
	113
	114	struct cpufreq_real_policy user_policy;
	115
	116	struct kobject kobj;
	117	struct completion kobj_unregister;
	118	};
	119
b8eed8af VK	120	#define CPUFREQ_ADJUST (0)
	121	#define CPUFREQ_INCOMPATIBLE (1)
	122	#define CPUFREQ_NOTIFY (2)
	123	#define CPUFREQ_START (3)
	124	#define CPUFREQ_UPDATE_POLICY_CPU (4)
1da177e4	125
62b36cc1	126	/* Only for ACPI */
46f18e3a VP	127	#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
	128	#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
	129	#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
	130	#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
1da177e4	131
2624f90c FB	132	static inline bool policy_is_shared(struct cpufreq_policy *policy)
	133	{
	134	return cpumask_weight(policy->cpus) > 1;
	135	}
	136
1da177e4 LT	137	/****************** cpufreq transition notifiers *****************/
	138
	139	#define CPUFREQ_PRECHANGE (0)
	140	#define CPUFREQ_POSTCHANGE (1)
	141	#define CPUFREQ_RESUMECHANGE (8)
42d4dc3f	142	#define CPUFREQ_SUSPENDCHANGE (9)
1da177e4 LT	143
	144	struct cpufreq_freqs {
	145	unsigned int cpu; /* cpu nr */
	146	unsigned int old;
	147	unsigned int new;
	148	u8 flags; /* flags of cpufreq_driver, see below. */
	149	};
	150
	151
	152	/**
	153	* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
	154	* @old: old value
	155	* @div: divisor
	156	* @mult: multiplier
	157	*
	158	*
	159	* new = old * mult / div
	160	*/
	161	static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
	162	{
	163	#if BITS_PER_LONG == 32
	164
	165	u64 result = ((u64) old) * ((u64) mult);
	166	do_div(result, div);
	167	return (unsigned long) result;
	168
	169	#elif BITS_PER_LONG == 64
	170
	171	unsigned long result = old * ((u64) mult);
	172	result /= div;
	173	return result;
	174
	175	#endif
	176	};
	177
	178	/*********************************************************************
	179	* CPUFREQ GOVERNORS *
	180	*********************************************************************/
	181
7bd353a9 VK	182	#define CPUFREQ_GOV_START 1
	183	#define CPUFREQ_GOV_STOP 2
	184	#define CPUFREQ_GOV_LIMITS 3
	185	#define CPUFREQ_GOV_POLICY_INIT 4
	186	#define CPUFREQ_GOV_POLICY_EXIT 5
1da177e4 LT	187
	188	struct cpufreq_governor {
	189	char name[CPUFREQ_NAME_LEN];
b394058f	190	int initialized;
335dc333	191	int (governor) (struct cpufreq_policy policy,
1da177e4	192	unsigned int event);
9e76988e VP	193	ssize_t (show_setspeed) (struct cpufreq_policy policy,
9e76988e VP	194	char *buf);
335dc333	195	int (store_setspeed) (struct cpufreq_policy policy,
9e76988e	196	unsigned int freq);
1c256245 TR	197	unsigned int max_transition_latency; /* HW must be able to switch to
	198	next freq faster than this value in nano secs or we
	199	will fallback to performance governor */
1da177e4 LT	200	struct list_head governor_list;
	201	struct module *owner;
	202	};
	203
335dc333 TF	204	/*
335dc333 TF	205	* Pass a target to the cpufreq driver.
1da177e4 LT	206	*/
	207	extern int cpufreq_driver_target(struct cpufreq_policy *policy,
	208	unsigned int target_freq,
	209	unsigned int relation);
	210	extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
	211	unsigned int target_freq,
	212	unsigned int relation);
	213
	214
bf0b90e3	215	extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
bf0b90e3	216	unsigned int cpu);
dfde5d62	217
1da177e4 LT	218	int cpufreq_register_governor(struct cpufreq_governor *governor);
	219	void cpufreq_unregister_governor(struct cpufreq_governor *governor);
	220
	221
	222	/*********************************************************************
	223	* CPUFREQ DRIVER INTERFACE *
	224	*********************************************************************/
	225
	226	#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
	227	#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
	228
	229	struct freq_attr;
	230
	231	struct cpufreq_driver {
	232	struct module *owner;
	233	char name[CPUFREQ_NAME_LEN];
	234	u8 flags;
4d5dcc42 VK	235	/*
	236	* This should be set by platforms having multiple clock-domains, i.e.
	237	* supporting multiple policies. With this sysfs directories of governor
	238	* would be created in cpu/cpu<num>/cpufreq/ directory and so they can
	239	* use the same governor with different tunables for different clusters.
	240	*/
	241	bool have_governor_per_policy;
1da177e4 LT	242
	243	/* needed by all drivers */
	244	int (init) (struct cpufreq_policy policy);
	245	int (verify) (struct cpufreq_policy policy);
	246
	247	/* define one out of two */
	248	int (setpolicy) (struct cpufreq_policy policy);
	249	int (target) (struct cpufreq_policy policy,
	250	unsigned int target_freq,
	251	unsigned int relation);
	252
	253	/* should be defined, if possible */
	254	unsigned int (*get) (unsigned int cpu);
	255
	256	/* optional */
bf0b90e3	257	unsigned int (getavg) (struct cpufreq_policy policy,
bf0b90e3	258	unsigned int cpu);
e2f74f35	259	int (bios_limit) (int cpu, unsigned int limit);
bf0b90e3	260
1da177e4	261	int (exit) (struct cpufreq_policy policy);
7ca64e2d	262	int (suspend) (struct cpufreq_policy policy);
1da177e4 LT	263	int (resume) (struct cpufreq_policy policy);
	264	struct freq_attr **attr;
	265	};
	266
	267	/* flags */
	268
335dc333	269	#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
1da177e4	270	* all ->init() calls failed */
335dc333	271	#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
1da177e4 LT	272	* "constants" aren't affected by
1da177e4 LT	273	* frequency transitions */
42d4dc3f BH	274	#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
42d4dc3f BH	275	* mismatches */
1da177e4	276
221dee28 LT	277	int cpufreq_register_driver(struct cpufreq_driver *driver_data);
221dee28 LT	278	int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
1da177e4 LT	279
	280
	281	void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
	282
	283
335dc333	284	static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
1da177e4 LT	285	{
	286	if (policy->min < min)
	287	policy->min = min;
	288	if (policy->max < min)
	289	policy->max = min;
	290	if (policy->min > max)
	291	policy->min = max;
	292	if (policy->max > max)
	293	policy->max = max;
	294	if (policy->min > policy->max)
	295	policy->min = policy->max;
	296	return;
	297	}
	298
	299	struct freq_attr {
	300	struct attribute attr;
	301	ssize_t (show)(struct cpufreq_policy , char *);
	302	ssize_t (store)(struct cpufreq_policy , const char *, size_t count);
	303	};
	304
6dad2a29 BP	305	#define cpufreq_freq_attr_ro(_name) \
	306	static struct freq_attr _name = \
	307	__ATTR(_name, 0444, show_##_name, NULL)
	308
	309	#define cpufreq_freq_attr_ro_perm(_name, _perm) \
	310	static struct freq_attr _name = \
	311	__ATTR(_name, _perm, show_##_name, NULL)
	312
6dad2a29 BP	313	#define cpufreq_freq_attr_rw(_name) \
	314	static struct freq_attr _name = \
	315	__ATTR(_name, 0644, show_##_name, store_##_name)
	316
8aa84ad8 TR	317	struct global_attr {
	318	struct attribute attr;
	319	ssize_t (show)(struct kobject kobj,
	320	struct attribute attr, char buf);
	321	ssize_t (store)(struct kobject a, struct attribute *b,
	322	const char *c, size_t count);
	323	};
1da177e4	324
6dad2a29 BP	325	#define define_one_global_ro(_name) \
	326	static struct global_attr _name = \
	327	__ATTR(_name, 0444, show_##_name, NULL)
	328
	329	#define define_one_global_rw(_name) \
	330	static struct global_attr _name = \
	331	__ATTR(_name, 0644, show_##_name, store_##_name)
	332
ab45bd9b BP	333	struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
	334	void cpufreq_cpu_put(struct cpufreq_policy *data);
	335	const char *cpufreq_get_current_driver(void);
6dad2a29	336
1da177e4 LT	337	/*********************************************************************
	338	* CPUFREQ 2.6. INTERFACE *
	339	*********************************************************************/
1da177e4 LT	340	int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
1da177e4 LT	341	int cpufreq_update_policy(unsigned int cpu);
4d5dcc42	342	bool have_governor_per_policy(void);
1da177e4	343
2eca40a8	344	#ifdef CONFIG_CPU_FREQ
ff0ce684 LT	345	/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
ff0ce684 LT	346	unsigned int cpufreq_get(unsigned int cpu);
2eca40a8 RD	347	#else
	348	static inline unsigned int cpufreq_get(unsigned int cpu)
	349	{
	350	return 0;
	351	}
	352	#endif
1da177e4	353
ff0ce684	354	/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
95235ca2 VP	355	#ifdef CONFIG_CPU_FREQ
95235ca2 VP	356	unsigned int cpufreq_quick_get(unsigned int cpu);
3d737108	357	unsigned int cpufreq_quick_get_max(unsigned int cpu);
95235ca2 VP	358	#else
	359	static inline unsigned int cpufreq_quick_get(unsigned int cpu)
	360	{
	361	return 0;
	362	}
3d737108 JB	363	static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
	364	{
	365	return 0;
	366	}
95235ca2 VP	367	#endif
95235ca2 VP	368
1da177e4 LT	369
	370	/*********************************************************************
	371	* CPUFREQ DEFAULT GOVERNOR *
	372	*********************************************************************/
	373
	374
1c256245 TR	375	/*
	376	Performance governor is fallback governor if any other gov failed to
	377	auto load due latency restrictions
	378	*/
6afde10c	379	#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
1da177e4	380	extern struct cpufreq_governor cpufreq_gov_performance;
6afde10c	381	#endif
1c256245 TR	382	#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
1c256245 TR	383	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
30d221db AG	384	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
	385	extern struct cpufreq_governor cpufreq_gov_powersave;
	386	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
1da177e4 LT	387	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
1da177e4 LT	388	extern struct cpufreq_governor cpufreq_gov_userspace;
1c256245 TR	389	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
	390	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
	391	extern struct cpufreq_governor cpufreq_gov_ondemand;
	392	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
	393	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
	394	extern struct cpufreq_governor cpufreq_gov_conservative;
	395	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
1da177e4 LT	396	#endif
	397
	398
	399	/*********************************************************************
	400	* FREQUENCY TABLE HELPERS *
	401	*********************************************************************/
	402
	403	#define CPUFREQ_ENTRY_INVALID ~0
	404	#define CPUFREQ_TABLE_END ~1
	405
	406	struct cpufreq_frequency_table {
	407	unsigned int index; /* any */
	408	unsigned int frequency; /* kHz - doesn't need to be in ascending
	409	* order */
	410	};
	411
	412	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	413	struct cpufreq_frequency_table *table);
	414
	415	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	416	struct cpufreq_frequency_table *table);
	417
	418	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	419	struct cpufreq_frequency_table *table,
	420	unsigned int target_freq,
	421	unsigned int relation,
	422	unsigned int *index);
	423
	424	/* the following 3 funtions are for cpufreq core use only */
	425	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
1da177e4 LT	426
	427	/* the following are really really optional */
	428	extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
	429
335dc333	430	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
1da177e4	431	unsigned int cpu);
b8eed8af	432	void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy);
1da177e4 LT	433
1da177e4 LT	434	void cpufreq_frequency_table_put_attr(unsigned int cpu);
1da177e4	435	#endif /* _LINUX_CPUFREQ_H */