[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/cpumask.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/notifier.h>
#include <linux/sysfs.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;
int cpufreq_get_global_kobject(void);
void cpufreq_put_global_kobject(void);
int cpufreq_sysfs_create_file(const struct attribute *attr);
void cpufreq_sysfs_remove_file(const struct attribute *attr);

#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;
	bool			governor_enabled; /* governor start/stop flag */

	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;
	int			transition_ongoing; /* Tracks transition status */
};

#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);
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 */
	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_policy *policy,
		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                     *
 *********************************************************************/
u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
int cpufreq_update_policy(unsigned int cpu);
bool have_governor_per_policy(void);
struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);

#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	driver_data; /* driver specific data, not used by core */
	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);

ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);

#endif /* _LINUX_CPUFREQ_H */
Commit	Line	Data
1da177e4	1	/*
bb176f7d	2	* linux/include/linux/cpufreq.h
1da177e4	3	*
bb176f7d VK	4	* Copyright (C) 2001 Russell King
bb176f7d VK	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
5ff0a268 VK	14	#include <linux/cpumask.h>
5ff0a268 VK	15	#include <linux/completion.h>
1da177e4	16	#include <linux/kobject.h>
5ff0a268	17	#include <linux/notifier.h>
1da177e4	18	#include <linux/sysfs.h>
1da177e4 LT	19
1da177e4 LT	20	#define CPUFREQ_NAME_LEN 16
4b972f0b	21	/* Print length for names. Extra 1 space for accomodating '\n' in prints */
4b972f0b	22	#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
1da177e4	23
1da177e4 LT	24	/*********************************************************************
	25	* CPUFREQ NOTIFIER INTERFACE *
	26	*********************************************************************/
	27
1da177e4 LT	28	#define CPUFREQ_TRANSITION_NOTIFIER (0)
	29	#define CPUFREQ_POLICY_NOTIFIER (1)
	30
6070b5de SS	31	#ifdef CONFIG_CPU_FREQ
	32	int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
	33	int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
a7b422cd	34	extern void disable_cpufreq(void);
6070b5de SS	35	#else /* CONFIG_CPU_FREQ */
	36	static inline int cpufreq_register_notifier(struct notifier_block *nb,
	37	unsigned int list)
	38	{
	39	return 0;
	40	}
	41	static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
	42	unsigned int list)
	43	{
	44	return 0;
	45	}
a7b422cd	46	static inline void disable_cpufreq(void) { }
6070b5de	47	#endif /* CONFIG_CPU_FREQ */
1da177e4 LT	48
	49	/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
	50	* within the limits is used. If (cpufreq_driver->setpolicy> exists, these
	51	* two generic policies are available:
	52	*/
	53
	54	#define CPUFREQ_POLICY_POWERSAVE (1)
	55	#define CPUFREQ_POLICY_PERFORMANCE (2)
	56
335dc333 TF	57	/* Frequency values here are CPU kHz so that hardware which doesn't run
	58	* with some frequencies can complain without having to guess what per
	59	* cent / per mille means.
b53cc6ea	60	* Maximum transition latency is in nanoseconds - if it's unknown,
1da177e4 LT	61	* CPUFREQ_ETERNAL shall be used.
	62	*/
	63
	64	struct cpufreq_governor;
	65
8aa84ad8 TR	66	/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
8aa84ad8 TR	67	extern struct kobject *cpufreq_global_kobject;
2361be23 VK	68	int cpufreq_get_global_kobject(void);
	69	void cpufreq_put_global_kobject(void);
	70	int cpufreq_sysfs_create_file(const struct attribute *attr);
	71	void cpufreq_sysfs_remove_file(const struct attribute *attr);
8aa84ad8	72
1da177e4 LT	73	#define CPUFREQ_ETERNAL (-1)
	74	struct cpufreq_cpuinfo {
	75	unsigned int max_freq;
	76	unsigned int min_freq;
335dc333 TF	77
	78	/* in 10^(-9) s = nanoseconds */
	79	unsigned int transition_latency;
1da177e4 LT	80	};
	81
	82	struct cpufreq_real_policy {
	83	unsigned int min; /* in kHz */
	84	unsigned int max; /* in kHz */
335dc333	85	unsigned int policy; /* see above */
1da177e4 LT	86	struct cpufreq_governor governor; / see below */
	87	};
	88
	89	struct cpufreq_policy {
951fc5f4 VK	90	/* CPUs sharing clock, require sw coordination */
	91	cpumask_var_t cpus; /* Online CPUs only */
	92	cpumask_var_t related_cpus; /* Online + Offline CPUs */
	93
62b36cc1	94	unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
3b2d9942	95	should set cpufreq */
b8eed8af VK	96	unsigned int cpu; /* cpu nr of CPU managing this policy */
	97	unsigned int last_cpu; /* cpu nr of previous CPU that managed
	98	* this policy */
1da177e4 LT	99	struct cpufreq_cpuinfo cpuinfo;/* see above */
	100
	101	unsigned int min; /* in kHz */
	102	unsigned int max; /* in kHz */
	103	unsigned int cur; /* in kHz, only needed if cpufreq
	104	* governors are used */
335dc333	105	unsigned int policy; /* see above */
1da177e4	106	struct cpufreq_governor governor; / see below */
7bd353a9	107	void *governor_data;
95731ebb	108	bool governor_enabled; /* governor start/stop flag */
1da177e4	109
1da177e4 LT	110	struct work_struct update; /* if update_policy() needs to be
	111	* called, but you're in IRQ context */
	112
	113	struct cpufreq_real_policy user_policy;
	114
	115	struct kobject kobj;
	116	struct completion kobj_unregister;
266c13d7	117	int transition_ongoing; /* Tracks transition status */
1da177e4 LT	118	};
1da177e4 LT	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
1da177e4	151	/**
bb176f7d VK	152	* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
bb176f7d VK	153	* safe)
1da177e4 LT	154	* @old: old value
	155	* @div: divisor
	156	* @mult: multiplier
	157	*
	158	*
bb176f7d	159	* new = old * mult / div
1da177e4	160	*/
bb176f7d VK	161	static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
bb176f7d VK	162	u_int mult)
1da177e4 LT	163	{
	164	#if BITS_PER_LONG == 32
	165
	166	u64 result = ((u64) old) * ((u64) mult);
	167	do_div(result, div);
	168	return (unsigned long) result;
	169
	170	#elif BITS_PER_LONG == 64
	171
	172	unsigned long result = old * ((u64) mult);
	173	result /= div;
	174	return result;
	175
	176	#endif
	177	};
	178
	179	/*********************************************************************
	180	* CPUFREQ GOVERNORS *
	181	*********************************************************************/
	182
7bd353a9 VK	183	#define CPUFREQ_GOV_START 1
	184	#define CPUFREQ_GOV_STOP 2
	185	#define CPUFREQ_GOV_LIMITS 3
	186	#define CPUFREQ_GOV_POLICY_INIT 4
	187	#define CPUFREQ_GOV_POLICY_EXIT 5
1da177e4 LT	188
	189	struct cpufreq_governor {
	190	char name[CPUFREQ_NAME_LEN];
b394058f	191	int initialized;
335dc333	192	int (governor) (struct cpufreq_policy policy,
1da177e4	193	unsigned int event);
9e76988e VP	194	ssize_t (show_setspeed) (struct cpufreq_policy policy,
9e76988e VP	195	char *buf);
335dc333	196	int (store_setspeed) (struct cpufreq_policy policy,
9e76988e	197	unsigned int freq);
1c256245 TR	198	unsigned int max_transition_latency; /* HW must be able to switch to
	199	next freq faster than this value in nano secs or we
	200	will fallback to performance governor */
1da177e4 LT	201	struct list_head governor_list;
	202	struct module *owner;
	203	};
	204
335dc333 TF	205	/*
335dc333 TF	206	* Pass a target to the cpufreq driver.
1da177e4 LT	207	*/
	208	extern int cpufreq_driver_target(struct cpufreq_policy *policy,
	209	unsigned int target_freq,
	210	unsigned int relation);
	211	extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
	212	unsigned int target_freq,
	213	unsigned int relation);
1da177e4 LT	214	int cpufreq_register_governor(struct cpufreq_governor *governor);
	215	void cpufreq_unregister_governor(struct cpufreq_governor *governor);
	216
1da177e4 LT	217	/*********************************************************************
	218	* CPUFREQ DRIVER INTERFACE *
	219	*********************************************************************/
	220
	221	#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
	222	#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
	223
	224	struct freq_attr;
	225
	226	struct cpufreq_driver {
bb176f7d	227	struct module *owner;
1da177e4 LT	228	char name[CPUFREQ_NAME_LEN];
1da177e4 LT	229	u8 flags;
4d5dcc42 VK	230	/*
	231	* This should be set by platforms having multiple clock-domains, i.e.
	232	* supporting multiple policies. With this sysfs directories of governor
	233	* would be created in cpu/cpu<num>/cpufreq/ directory and so they can
	234	* use the same governor with different tunables for different clusters.
	235	*/
	236	bool have_governor_per_policy;
1da177e4 LT	237
	238	/* needed by all drivers */
	239	int (init) (struct cpufreq_policy policy);
	240	int (verify) (struct cpufreq_policy policy);
	241
	242	/* define one out of two */
	243	int (setpolicy) (struct cpufreq_policy policy);
	244	int (target) (struct cpufreq_policy policy,
	245	unsigned int target_freq,
	246	unsigned int relation);
	247
	248	/* should be defined, if possible */
	249	unsigned int (*get) (unsigned int cpu);
	250
	251	/* optional */
e2f74f35	252	int (bios_limit) (int cpu, unsigned int limit);
bf0b90e3	253
1da177e4	254	int (exit) (struct cpufreq_policy policy);
7ca64e2d	255	int (suspend) (struct cpufreq_policy policy);
1da177e4 LT	256	int (resume) (struct cpufreq_policy policy);
	257	struct freq_attr **attr;
	258	};
	259
	260	/* flags */
	261
335dc333	262	#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
1da177e4	263	* all ->init() calls failed */
335dc333	264	#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
1da177e4 LT	265	* "constants" aren't affected by
1da177e4 LT	266	* frequency transitions */
42d4dc3f BH	267	#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
42d4dc3f BH	268	* mismatches */
1da177e4	269
221dee28 LT	270	int cpufreq_register_driver(struct cpufreq_driver *driver_data);
221dee28 LT	271	int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
1da177e4	272
b43a7ffb VK	273	void cpufreq_notify_transition(struct cpufreq_policy *policy,
b43a7ffb VK	274	struct cpufreq_freqs *freqs, unsigned int state);
1da177e4	275
bb176f7d VK	276	static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
bb176f7d VK	277	unsigned int min, unsigned int max)
1da177e4 LT	278	{
	279	if (policy->min < min)
	280	policy->min = min;
	281	if (policy->max < min)
	282	policy->max = min;
	283	if (policy->min > max)
	284	policy->min = max;
	285	if (policy->max > max)
	286	policy->max = max;
	287	if (policy->min > policy->max)
	288	policy->min = policy->max;
	289	return;
	290	}
	291
	292	struct freq_attr {
	293	struct attribute attr;
	294	ssize_t (show)(struct cpufreq_policy , char *);
	295	ssize_t (store)(struct cpufreq_policy , const char *, size_t count);
	296	};
	297
6dad2a29 BP	298	#define cpufreq_freq_attr_ro(_name) \
	299	static struct freq_attr _name = \
	300	__ATTR(_name, 0444, show_##_name, NULL)
	301
	302	#define cpufreq_freq_attr_ro_perm(_name, _perm) \
	303	static struct freq_attr _name = \
	304	__ATTR(_name, _perm, show_##_name, NULL)
	305
6dad2a29 BP	306	#define cpufreq_freq_attr_rw(_name) \
	307	static struct freq_attr _name = \
	308	__ATTR(_name, 0644, show_##_name, store_##_name)
	309
8aa84ad8 TR	310	struct global_attr {
	311	struct attribute attr;
	312	ssize_t (show)(struct kobject kobj,
	313	struct attribute attr, char buf);
	314	ssize_t (store)(struct kobject a, struct attribute *b,
	315	const char *c, size_t count);
	316	};
1da177e4	317
6dad2a29 BP	318	#define define_one_global_ro(_name) \
	319	static struct global_attr _name = \
	320	__ATTR(_name, 0444, show_##_name, NULL)
	321
	322	#define define_one_global_rw(_name) \
	323	static struct global_attr _name = \
	324	__ATTR(_name, 0644, show_##_name, store_##_name)
	325
ab45bd9b BP	326	struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
	327	void cpufreq_cpu_put(struct cpufreq_policy *data);
	328	const char *cpufreq_get_current_driver(void);
6dad2a29	329
1da177e4 LT	330	/*********************************************************************
	331	* CPUFREQ 2.6. INTERFACE *
	332	*********************************************************************/
72a4ce34	333	u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
1da177e4 LT	334	int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
1da177e4 LT	335	int cpufreq_update_policy(unsigned int cpu);
4d5dcc42	336	bool have_governor_per_policy(void);
944e9a03	337	struct kobject get_governor_parent_kobj(struct cpufreq_policy policy);
1da177e4	338
2eca40a8	339	#ifdef CONFIG_CPU_FREQ
bb176f7d VK	340	/*
	341	* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it
	342	*/
ff0ce684	343	unsigned int cpufreq_get(unsigned int cpu);
2eca40a8 RD	344	#else
	345	static inline unsigned int cpufreq_get(unsigned int cpu)
	346	{
	347	return 0;
	348	}
	349	#endif
1da177e4	350
bb176f7d VK	351	/*
	352	* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it
	353	*/
95235ca2 VP	354	#ifdef CONFIG_CPU_FREQ
95235ca2 VP	355	unsigned int cpufreq_quick_get(unsigned int cpu);
3d737108	356	unsigned int cpufreq_quick_get_max(unsigned int cpu);
95235ca2 VP	357	#else
	358	static inline unsigned int cpufreq_quick_get(unsigned int cpu)
	359	{
	360	return 0;
	361	}
3d737108 JB	362	static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
	363	{
	364	return 0;
	365	}
95235ca2 VP	366	#endif
95235ca2 VP	367
1da177e4 LT	368	/*********************************************************************
	369	* CPUFREQ DEFAULT GOVERNOR *
	370	*********************************************************************/
	371
1c256245	372	/*
bb176f7d VK	373	* Performance governor is fallback governor if any other gov failed to auto
	374	* load due latency restrictions
	375	*/
6afde10c	376	#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
1da177e4	377	extern struct cpufreq_governor cpufreq_gov_performance;
6afde10c	378	#endif
1c256245 TR	379	#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
1c256245 TR	380	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
30d221db AG	381	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
	382	extern struct cpufreq_governor cpufreq_gov_powersave;
	383	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
1da177e4 LT	384	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
1da177e4 LT	385	extern struct cpufreq_governor cpufreq_gov_userspace;
1c256245 TR	386	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
	387	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
	388	extern struct cpufreq_governor cpufreq_gov_ondemand;
	389	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
	390	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
	391	extern struct cpufreq_governor cpufreq_gov_conservative;
	392	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
1da177e4 LT	393	#endif
1da177e4 LT	394
1da177e4 LT	395	/*********************************************************************
	396	* FREQUENCY TABLE HELPERS *
	397	*********************************************************************/
	398
	399	#define CPUFREQ_ENTRY_INVALID ~0
	400	#define CPUFREQ_TABLE_END ~1
	401
	402	struct cpufreq_frequency_table {
50701588	403	unsigned int driver_data; /* driver specific data, not used by core */
1da177e4 LT	404	unsigned int frequency; /* kHz - doesn't need to be in ascending
	405	* order */
	406	};
	407
	408	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	409	struct cpufreq_frequency_table *table);
	410
	411	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	412	struct cpufreq_frequency_table *table);
	413
	414	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	415	struct cpufreq_frequency_table *table,
	416	unsigned int target_freq,
	417	unsigned int relation,
	418	unsigned int *index);
	419
	420	/* the following 3 funtions are for cpufreq core use only */
	421	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
1da177e4 LT	422
	423	/* the following are really really optional */
	424	extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
	425
335dc333	426	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
1da177e4	427	unsigned int cpu);
b8eed8af	428	void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy);
1da177e4 LT	429
1da177e4 LT	430	void cpufreq_frequency_table_put_attr(unsigned int cpu);
f4fd3797 LT	431
	432	ssize_t cpufreq_show_cpus(const struct cpumask mask, char buf);
	433
1da177e4	434	#endif /* _LINUX_CPUFREQ_H */