[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/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>
1da177e4 LT	16	#include <linux/threads.h>
1da177e4 LT	17	#include <linux/kobject.h>
	18	#include <linux/sysfs.h>
	19	#include <linux/completion.h>
	20	#include <linux/workqueue.h>
	21	#include <linux/cpumask.h>
4e57b681	22	#include <asm/div64.h>
1da177e4 LT	23
	24	#define CPUFREQ_NAME_LEN 16
	25
	26
	27	/*********************************************************************
	28	* CPUFREQ NOTIFIER INTERFACE *
	29	*********************************************************************/
	30
1da177e4 LT	31	#define CPUFREQ_TRANSITION_NOTIFIER (0)
	32	#define CPUFREQ_POLICY_NOTIFIER (1)
	33
6070b5de SS	34	#ifdef CONFIG_CPU_FREQ
	35	int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
	36	int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
	37	#else /* CONFIG_CPU_FREQ */
	38	static inline int cpufreq_register_notifier(struct notifier_block *nb,
	39	unsigned int list)
	40	{
	41	return 0;
	42	}
	43	static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
	44	unsigned int list)
	45	{
	46	return 0;
	47	}
	48	#endif /* CONFIG_CPU_FREQ */
1da177e4 LT	49
	50	/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
	51	* within the limits is used. If (cpufreq_driver->setpolicy> exists, these
	52	* two generic policies are available:
	53	*/
	54
	55	#define CPUFREQ_POLICY_POWERSAVE (1)
	56	#define CPUFREQ_POLICY_PERFORMANCE (2)
	57
335dc333 TF	58	/* Frequency values here are CPU kHz so that hardware which doesn't run
	59	* with some frequencies can complain without having to guess what per
	60	* cent / per mille means.
b53cc6ea	61	* Maximum transition latency is in nanoseconds - if it's unknown,
1da177e4 LT	62	* CPUFREQ_ETERNAL shall be used.
	63	*/
	64
	65	struct cpufreq_governor;
	66
8aa84ad8 TR	67	/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
	68	extern struct kobject *cpufreq_global_kobject;
	69
1da177e4 LT	70	#define CPUFREQ_ETERNAL (-1)
	71	struct cpufreq_cpuinfo {
	72	unsigned int max_freq;
	73	unsigned int min_freq;
335dc333 TF	74
	75	/* in 10^(-9) s = nanoseconds */
	76	unsigned int transition_latency;
1da177e4 LT	77	};
	78
	79	struct cpufreq_real_policy {
	80	unsigned int min; /* in kHz */
	81	unsigned int max; /* in kHz */
335dc333	82	unsigned int policy; /* see above */
1da177e4 LT	83	struct cpufreq_governor governor; / see below */
	84	};
	85
	86	struct cpufreq_policy {
835481d9 RR	87	cpumask_var_t cpus; /* CPUs requiring sw coordination */
835481d9 RR	88	cpumask_var_t related_cpus; /* CPUs with any coordination */
3b2d9942 VP	89	unsigned int shared_type; /* ANY or ALL affected CPUs
3b2d9942 VP	90	should set cpufreq */
1da177e4 LT	91	unsigned int cpu; /* cpu nr of registered CPU */
	92	struct cpufreq_cpuinfo cpuinfo;/* see above */
	93
	94	unsigned int min; /* in kHz */
	95	unsigned int max; /* in kHz */
	96	unsigned int cur; /* in kHz, only needed if cpufreq
	97	* governors are used */
335dc333	98	unsigned int policy; /* see above */
1da177e4 LT	99	struct cpufreq_governor governor; / see below */
1da177e4 LT	100
1da177e4 LT	101	struct work_struct update; /* if update_policy() needs to be
	102	* called, but you're in IRQ context */
	103
	104	struct cpufreq_real_policy user_policy;
	105
	106	struct kobject kobj;
	107	struct completion kobj_unregister;
	108	};
	109
	110	#define CPUFREQ_ADJUST (0)
	111	#define CPUFREQ_INCOMPATIBLE (1)
	112	#define CPUFREQ_NOTIFY (2)
a1531acd	113	#define CPUFREQ_START (3)
1da177e4	114
46f18e3a VP	115	#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
	116	#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
	117	#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
	118	#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
1da177e4 LT	119
	120	/****************** cpufreq transition notifiers *****************/
	121
	122	#define CPUFREQ_PRECHANGE (0)
	123	#define CPUFREQ_POSTCHANGE (1)
	124	#define CPUFREQ_RESUMECHANGE (8)
42d4dc3f	125	#define CPUFREQ_SUSPENDCHANGE (9)
1da177e4 LT	126
	127	struct cpufreq_freqs {
	128	unsigned int cpu; /* cpu nr */
	129	unsigned int old;
	130	unsigned int new;
	131	u8 flags; /* flags of cpufreq_driver, see below. */
	132	};
	133
	134
	135	/**
	136	* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
	137	* @old: old value
	138	* @div: divisor
	139	* @mult: multiplier
	140	*
	141	*
	142	* new = old * mult / div
	143	*/
	144	static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
	145	{
	146	#if BITS_PER_LONG == 32
	147
	148	u64 result = ((u64) old) * ((u64) mult);
	149	do_div(result, div);
	150	return (unsigned long) result;
	151
	152	#elif BITS_PER_LONG == 64
	153
	154	unsigned long result = old * ((u64) mult);
	155	result /= div;
	156	return result;
	157
	158	#endif
	159	};
	160
	161	/*********************************************************************
	162	* CPUFREQ GOVERNORS *
	163	*********************************************************************/
	164
	165	#define CPUFREQ_GOV_START 1
	166	#define CPUFREQ_GOV_STOP 2
	167	#define CPUFREQ_GOV_LIMITS 3
	168
	169	struct cpufreq_governor {
	170	char name[CPUFREQ_NAME_LEN];
335dc333	171	int (governor) (struct cpufreq_policy policy,
1da177e4	172	unsigned int event);
9e76988e VP	173	ssize_t (show_setspeed) (struct cpufreq_policy policy,
9e76988e VP	174	char *buf);
335dc333	175	int (store_setspeed) (struct cpufreq_policy policy,
9e76988e	176	unsigned int freq);
1c256245 TR	177	unsigned int max_transition_latency; /* HW must be able to switch to
	178	next freq faster than this value in nano secs or we
	179	will fallback to performance governor */
1da177e4 LT	180	struct list_head governor_list;
	181	struct module *owner;
	182	};
	183
335dc333 TF	184	/*
335dc333 TF	185	* Pass a target to the cpufreq driver.
1da177e4 LT	186	*/
	187	extern int cpufreq_driver_target(struct cpufreq_policy *policy,
	188	unsigned int target_freq,
	189	unsigned int relation);
	190	extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
	191	unsigned int target_freq,
	192	unsigned int relation);
	193
	194
bf0b90e3	195	extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
bf0b90e3	196	unsigned int cpu);
dfde5d62	197
1da177e4 LT	198	int cpufreq_register_governor(struct cpufreq_governor *governor);
	199	void cpufreq_unregister_governor(struct cpufreq_governor *governor);
	200
	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,
bf0b90e3	231	unsigned int cpu);
e2f74f35	232	int (bios_limit) (int cpu, unsigned int limit);
bf0b90e3	233
1da177e4	234	int (exit) (struct cpufreq_policy policy);
7ca64e2d	235	int (suspend) (struct cpufreq_policy policy);
1da177e4 LT	236	int (resume) (struct cpufreq_policy policy);
	237	struct freq_attr **attr;
	238	};
	239
	240	/* flags */
	241
335dc333	242	#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
1da177e4	243	* all ->init() calls failed */
335dc333	244	#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
1da177e4 LT	245	* "constants" aren't affected by
1da177e4 LT	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
335dc333	257	static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
1da177e4 LT	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
6dad2a29 BP	278	#define cpufreq_freq_attr_ro(_name) \
	279	static struct freq_attr _name = \
	280	__ATTR(_name, 0444, show_##_name, NULL)
	281
	282	#define cpufreq_freq_attr_ro_perm(_name, _perm) \
	283	static struct freq_attr _name = \
	284	__ATTR(_name, _perm, show_##_name, NULL)
	285
6dad2a29 BP	286	#define cpufreq_freq_attr_rw(_name) \
	287	static struct freq_attr _name = \
	288	__ATTR(_name, 0644, show_##_name, store_##_name)
	289
8aa84ad8 TR	290	struct global_attr {
	291	struct attribute attr;
	292	ssize_t (show)(struct kobject kobj,
	293	struct attribute attr, char buf);
	294	ssize_t (store)(struct kobject a, struct attribute *b,
	295	const char *c, size_t count);
	296	};
1da177e4	297
6dad2a29 BP	298	#define define_one_global_ro(_name) \
	299	static struct global_attr _name = \
	300	__ATTR(_name, 0444, show_##_name, NULL)
	301
	302	#define define_one_global_rw(_name) \
	303	static struct global_attr _name = \
	304	__ATTR(_name, 0644, show_##_name, store_##_name)
	305
	306
1da177e4 LT	307	/*********************************************************************
	308	* CPUFREQ 2.6. INTERFACE *
	309	*********************************************************************/
1da177e4 LT	310	int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
	311	int cpufreq_update_policy(unsigned int cpu);
	312
2eca40a8	313	#ifdef CONFIG_CPU_FREQ
ff0ce684 LT	314	/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
ff0ce684 LT	315	unsigned int cpufreq_get(unsigned int cpu);
2eca40a8 RD	316	#else
	317	static inline unsigned int cpufreq_get(unsigned int cpu)
	318	{
	319	return 0;
	320	}
	321	#endif
1da177e4	322
ff0ce684	323	/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
95235ca2 VP	324	#ifdef CONFIG_CPU_FREQ
95235ca2 VP	325	unsigned int cpufreq_quick_get(unsigned int cpu);
3d737108	326	unsigned int cpufreq_quick_get_max(unsigned int cpu);
95235ca2 VP	327	#else
	328	static inline unsigned int cpufreq_quick_get(unsigned int cpu)
	329	{
	330	return 0;
	331	}
3d737108 JB	332	static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
	333	{
	334	return 0;
	335	}
95235ca2 VP	336	#endif
95235ca2 VP	337
1da177e4 LT	338
	339	/*********************************************************************
	340	* CPUFREQ DEFAULT GOVERNOR *
	341	*********************************************************************/
	342
	343
1c256245 TR	344	/*
	345	Performance governor is fallback governor if any other gov failed to
	346	auto load due latency restrictions
	347	*/
6afde10c	348	#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
1da177e4	349	extern struct cpufreq_governor cpufreq_gov_performance;
6afde10c	350	#endif
1c256245 TR	351	#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
1c256245 TR	352	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
30d221db AG	353	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
	354	extern struct cpufreq_governor cpufreq_gov_powersave;
	355	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
1da177e4 LT	356	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
1da177e4 LT	357	extern struct cpufreq_governor cpufreq_gov_userspace;
1c256245 TR	358	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
	359	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
	360	extern struct cpufreq_governor cpufreq_gov_ondemand;
	361	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
	362	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
	363	extern struct cpufreq_governor cpufreq_gov_conservative;
	364	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
1da177e4 LT	365	#endif
	366
	367
	368	/*********************************************************************
	369	* FREQUENCY TABLE HELPERS *
	370	*********************************************************************/
	371
	372	#define CPUFREQ_ENTRY_INVALID ~0
	373	#define CPUFREQ_TABLE_END ~1
	374
	375	struct cpufreq_frequency_table {
	376	unsigned int index; /* any */
	377	unsigned int frequency; /* kHz - doesn't need to be in ascending
	378	* order */
	379	};
	380
	381	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	382	struct cpufreq_frequency_table *table);
	383
	384	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	385	struct cpufreq_frequency_table *table);
	386
	387	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	388	struct cpufreq_frequency_table *table,
	389	unsigned int target_freq,
	390	unsigned int relation,
	391	unsigned int *index);
	392
	393	/* the following 3 funtions are for cpufreq core use only */
	394	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
	395	struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
335dc333	396	void cpufreq_cpu_put(struct cpufreq_policy *data);
1da177e4 LT	397
	398	/* the following are really really optional */
	399	extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
	400
335dc333	401	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
1da177e4 LT	402	unsigned int cpu);
	403
	404	void cpufreq_frequency_table_put_attr(unsigned int cpu);
	405
	406
1da177e4	407	#endif /* _LINUX_CPUFREQ_H */