[mirror_ubuntu-artful-kernel.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;

/* /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 {
	cpumask_var_t		cpus;	/* CPUs requiring sw coordination */
	cpumask_var_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);


/*********************************************************************
 *                      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	(*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)


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

#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);
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);


#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
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
335dc333 TF	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
8aa84ad8 TR	68	/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
	69	extern struct kobject *cpufreq_global_kobject;
	70
1da177e4 LT	71	#define CPUFREQ_ETERNAL (-1)
	72	struct cpufreq_cpuinfo {
	73	unsigned int max_freq;
	74	unsigned int min_freq;
335dc333 TF	75
	76	/* in 10^(-9) s = nanoseconds */
	77	unsigned int transition_latency;
1da177e4 LT	78	};
	79
	80	struct cpufreq_real_policy {
	81	unsigned int min; /* in kHz */
	82	unsigned int max; /* in kHz */
335dc333	83	unsigned int policy; /* see above */
1da177e4 LT	84	struct cpufreq_governor governor; / see below */
	85	};
	86
	87	struct cpufreq_policy {
835481d9 RR	88	cpumask_var_t cpus; /* CPUs requiring sw coordination */
835481d9 RR	89	cpumask_var_t related_cpus; /* CPUs with any coordination */
3b2d9942 VP	90	unsigned int shared_type; /* ANY or ALL affected CPUs
3b2d9942 VP	91	should set cpufreq */
1da177e4 LT	92	unsigned int cpu; /* cpu nr of registered CPU */
	93	struct cpufreq_cpuinfo cpuinfo;/* see above */
	94
	95	unsigned int min; /* in kHz */
	96	unsigned int max; /* in kHz */
	97	unsigned int cur; /* in kHz, only needed if cpufreq
	98	* governors are used */
335dc333	99	unsigned int policy; /* see above */
1da177e4 LT	100	struct cpufreq_governor governor; / see below */
1da177e4 LT	101
1da177e4 LT	102	struct work_struct update; /* if update_policy() needs to be
	103	* called, but you're in IRQ context */
	104
	105	struct cpufreq_real_policy user_policy;
	106
	107	struct kobject kobj;
	108	struct completion kobj_unregister;
	109	};
	110
	111	#define CPUFREQ_ADJUST (0)
	112	#define CPUFREQ_INCOMPATIBLE (1)
	113	#define CPUFREQ_NOTIFY (2)
a1531acd	114	#define CPUFREQ_START (3)
1da177e4	115
46f18e3a VP	116	#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
	117	#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
	118	#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
	119	#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
1da177e4 LT	120
	121	/****************** cpufreq transition notifiers *****************/
	122
	123	#define CPUFREQ_PRECHANGE (0)
	124	#define CPUFREQ_POSTCHANGE (1)
	125	#define CPUFREQ_RESUMECHANGE (8)
42d4dc3f	126	#define CPUFREQ_SUSPENDCHANGE (9)
1da177e4 LT	127
	128	struct cpufreq_freqs {
	129	unsigned int cpu; /* cpu nr */
	130	unsigned int old;
	131	unsigned int new;
	132	u8 flags; /* flags of cpufreq_driver, see below. */
	133	};
	134
	135
	136	/**
	137	* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
	138	* @old: old value
	139	* @div: divisor
	140	* @mult: multiplier
	141	*
	142	*
	143	* new = old * mult / div
	144	*/
	145	static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
	146	{
	147	#if BITS_PER_LONG == 32
	148
	149	u64 result = ((u64) old) * ((u64) mult);
	150	do_div(result, div);
	151	return (unsigned long) result;
	152
	153	#elif BITS_PER_LONG == 64
	154
	155	unsigned long result = old * ((u64) mult);
	156	result /= div;
	157	return result;
	158
	159	#endif
	160	};
	161
	162	/*********************************************************************
	163	* CPUFREQ GOVERNORS *
	164	*********************************************************************/
	165
	166	#define CPUFREQ_GOV_START 1
	167	#define CPUFREQ_GOV_STOP 2
	168	#define CPUFREQ_GOV_LIMITS 3
	169
	170	struct cpufreq_governor {
	171	char name[CPUFREQ_NAME_LEN];
335dc333	172	int (governor) (struct cpufreq_policy policy,
1da177e4	173	unsigned int event);
9e76988e VP	174	ssize_t (show_setspeed) (struct cpufreq_policy policy,
9e76988e VP	175	char *buf);
335dc333	176	int (store_setspeed) (struct cpufreq_policy policy,
9e76988e	177	unsigned int freq);
1c256245 TR	178	unsigned int max_transition_latency; /* HW must be able to switch to
	179	next freq faster than this value in nano secs or we
	180	will fallback to performance governor */
1da177e4 LT	181	struct list_head governor_list;
	182	struct module *owner;
	183	};
	184
335dc333 TF	185	/*
335dc333 TF	186	* Pass a target to the cpufreq driver.
1da177e4 LT	187	*/
	188	extern int cpufreq_driver_target(struct cpufreq_policy *policy,
	189	unsigned int target_freq,
	190	unsigned int relation);
	191	extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
	192	unsigned int target_freq,
	193	unsigned int relation);
	194
	195
bf0b90e3	196	extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
bf0b90e3	197	unsigned int cpu);
dfde5d62	198
1da177e4 LT	199	int cpufreq_register_governor(struct cpufreq_governor *governor);
	200	void cpufreq_unregister_governor(struct cpufreq_governor *governor);
	201
	202
	203	/*********************************************************************
	204	* CPUFREQ DRIVER INTERFACE *
	205	*********************************************************************/
	206
	207	#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
	208	#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
	209
	210	struct freq_attr;
	211
	212	struct cpufreq_driver {
	213	struct module *owner;
	214	char name[CPUFREQ_NAME_LEN];
	215	u8 flags;
	216
	217	/* needed by all drivers */
	218	int (init) (struct cpufreq_policy policy);
	219	int (verify) (struct cpufreq_policy policy);
	220
	221	/* define one out of two */
	222	int (setpolicy) (struct cpufreq_policy policy);
	223	int (target) (struct cpufreq_policy policy,
	224	unsigned int target_freq,
	225	unsigned int relation);
	226
	227	/* should be defined, if possible */
	228	unsigned int (*get) (unsigned int cpu);
	229
	230	/* optional */
bf0b90e3	231	unsigned int (getavg) (struct cpufreq_policy policy,
bf0b90e3	232	unsigned int cpu);
e2f74f35	233	int (bios_limit) (int cpu, unsigned int limit);
bf0b90e3	234
1da177e4	235	int (exit) (struct cpufreq_policy policy);
7ca64e2d	236	int (suspend) (struct cpufreq_policy policy);
1da177e4 LT	237	int (resume) (struct cpufreq_policy policy);
	238	struct freq_attr **attr;
	239	};
	240
	241	/* flags */
	242
335dc333	243	#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
1da177e4	244	* all ->init() calls failed */
335dc333	245	#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
1da177e4 LT	246	* "constants" aren't affected by
1da177e4 LT	247	* frequency transitions */
42d4dc3f BH	248	#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
42d4dc3f BH	249	* mismatches */
1da177e4	250
221dee28 LT	251	int cpufreq_register_driver(struct cpufreq_driver *driver_data);
221dee28 LT	252	int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
1da177e4 LT	253
	254
	255	void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
	256
	257
335dc333	258	static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
1da177e4 LT	259	{
	260	if (policy->min < min)
	261	policy->min = min;
	262	if (policy->max < min)
	263	policy->max = min;
	264	if (policy->min > max)
	265	policy->min = max;
	266	if (policy->max > max)
	267	policy->max = max;
	268	if (policy->min > policy->max)
	269	policy->min = policy->max;
	270	return;
	271	}
	272
	273	struct freq_attr {
	274	struct attribute attr;
	275	ssize_t (show)(struct cpufreq_policy , char *);
	276	ssize_t (store)(struct cpufreq_policy , const char *, size_t count);
	277	};
	278
6dad2a29 BP	279	#define cpufreq_freq_attr_ro(_name) \
	280	static struct freq_attr _name = \
	281	__ATTR(_name, 0444, show_##_name, NULL)
	282
	283	#define cpufreq_freq_attr_ro_perm(_name, _perm) \
	284	static struct freq_attr _name = \
	285	__ATTR(_name, _perm, show_##_name, NULL)
	286
6dad2a29 BP	287	#define cpufreq_freq_attr_rw(_name) \
	288	static struct freq_attr _name = \
	289	__ATTR(_name, 0644, show_##_name, store_##_name)
	290
8aa84ad8 TR	291	struct global_attr {
	292	struct attribute attr;
	293	ssize_t (show)(struct kobject kobj,
	294	struct attribute attr, char buf);
	295	ssize_t (store)(struct kobject a, struct attribute *b,
	296	const char *c, size_t count);
	297	};
1da177e4	298
6dad2a29 BP	299	#define define_one_global_ro(_name) \
	300	static struct global_attr _name = \
	301	__ATTR(_name, 0444, show_##_name, NULL)
	302
	303	#define define_one_global_rw(_name) \
	304	static struct global_attr _name = \
	305	__ATTR(_name, 0644, show_##_name, store_##_name)
	306
	307
1da177e4 LT	308	/*********************************************************************
	309	* CPUFREQ 2.6. INTERFACE *
	310	*********************************************************************/
1da177e4 LT	311	int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
	312	int cpufreq_update_policy(unsigned int cpu);
	313
2eca40a8	314	#ifdef CONFIG_CPU_FREQ
ff0ce684 LT	315	/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
ff0ce684 LT	316	unsigned int cpufreq_get(unsigned int cpu);
2eca40a8 RD	317	#else
	318	static inline unsigned int cpufreq_get(unsigned int cpu)
	319	{
	320	return 0;
	321	}
	322	#endif
1da177e4	323
ff0ce684	324	/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
95235ca2 VP	325	#ifdef CONFIG_CPU_FREQ
95235ca2 VP	326	unsigned int cpufreq_quick_get(unsigned int cpu);
3d737108	327	unsigned int cpufreq_quick_get_max(unsigned int cpu);
95235ca2 VP	328	#else
	329	static inline unsigned int cpufreq_quick_get(unsigned int cpu)
	330	{
	331	return 0;
	332	}
3d737108 JB	333	static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
	334	{
	335	return 0;
	336	}
95235ca2 VP	337	#endif
95235ca2 VP	338
1da177e4 LT	339
	340	/*********************************************************************
	341	* CPUFREQ DEFAULT GOVERNOR *
	342	*********************************************************************/
	343
	344
1c256245 TR	345	/*
	346	Performance governor is fallback governor if any other gov failed to
	347	auto load due latency restrictions
	348	*/
6afde10c	349	#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
1da177e4	350	extern struct cpufreq_governor cpufreq_gov_performance;
6afde10c	351	#endif
1c256245 TR	352	#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
1c256245 TR	353	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
30d221db AG	354	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
	355	extern struct cpufreq_governor cpufreq_gov_powersave;
	356	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
1da177e4 LT	357	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
1da177e4 LT	358	extern struct cpufreq_governor cpufreq_gov_userspace;
1c256245 TR	359	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
	360	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
	361	extern struct cpufreq_governor cpufreq_gov_ondemand;
	362	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
	363	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
	364	extern struct cpufreq_governor cpufreq_gov_conservative;
	365	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
1da177e4 LT	366	#endif
	367
	368
	369	/*********************************************************************
	370	* FREQUENCY TABLE HELPERS *
	371	*********************************************************************/
	372
	373	#define CPUFREQ_ENTRY_INVALID ~0
	374	#define CPUFREQ_TABLE_END ~1
	375
	376	struct cpufreq_frequency_table {
	377	unsigned int index; /* any */
	378	unsigned int frequency; /* kHz - doesn't need to be in ascending
	379	* order */
	380	};
	381
	382	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	383	struct cpufreq_frequency_table *table);
	384
	385	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	386	struct cpufreq_frequency_table *table);
	387
	388	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	389	struct cpufreq_frequency_table *table,
	390	unsigned int target_freq,
	391	unsigned int relation,
	392	unsigned int *index);
	393
	394	/* the following 3 funtions are for cpufreq core use only */
	395	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
	396	struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
335dc333	397	void cpufreq_cpu_put(struct cpufreq_policy *data);
1da177e4 LT	398
	399	/* the following are really really optional */
	400	extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
	401
335dc333	402	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
1da177e4 LT	403	unsigned int cpu);
	404
	405	void cpufreq_frequency_table_put_attr(unsigned int cpu);
	406
	407
1da177e4	408	#endif /* _LINUX_CPUFREQ_H */