[linux-2.6-block.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;
	unsigned int		transition_latency; /* in 10^(-9) s = nanoseconds */
};

struct cpufreq_real_policy {
	unsigned int		min;    /* in kHz */
	unsigned int		max;    /* in kHz */
        unsigned int		policy; /* see above */
	struct cpufreq_governor	*governor; /* see below */
};

struct cpufreq_policy {
	cpumask_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);

int lock_policy_rwsem_read(int cpu);
int lock_policy_rwsem_write(int cpu);
void unlock_policy_rwsem_read(int cpu);
void unlock_policy_rwsem_write(int cpu);


/*********************************************************************
 *                      CPUFREQ DRIVER INTERFACE                     *
 *********************************************************************/

#define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
#define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */

struct freq_attr;

struct cpufreq_driver {
	struct module           *owner;
	char			name[CPUFREQ_NAME_LEN];
	u8			flags;

	/* needed by all drivers */
	int	(*init)		(struct cpufreq_policy *policy);
	int	(*verify)	(struct cpufreq_policy *policy);

	/* define one out of two */
	int	(*setpolicy)	(struct cpufreq_policy *policy);
	int	(*target)	(struct cpufreq_policy *policy,
				 unsigned int target_freq,
				 unsigned int relation);

	/* should be defined, if possible */
	unsigned int	(*get)	(unsigned int cpu);

	/* optional */
	unsigned int (*getavg)	(struct cpufreq_policy *policy,
				 unsigned int cpu);
	int	(*bios_limit)	(int cpu, unsigned int *limit);

	int	(*exit)		(struct cpufreq_policy *policy);
	int	(*suspend)	(struct cpufreq_policy *policy, pm_message_t pmsg);
	int	(*resume)	(struct cpufreq_policy *policy);
	struct freq_attr	**attr;
};

/* 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_ro_old(_name)		\
static struct freq_attr _name##_old =		\
__ATTR(_name, 0444, show_##_name##_old, NULL)

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

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


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);
#else
static inline unsigned int cpufreq_quick_get(unsigned int cpu)
{
	return 0;
}
#endif


/*********************************************************************
 *                       CPUFREQ DEFAULT GOVERNOR                    *
 *********************************************************************/


/*
  Performance governor is fallback governor if any other gov failed to
  auto load due latency restrictions
*/
#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
extern struct cpufreq_governor cpufreq_gov_performance;
#endif
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_performance)
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
extern struct cpufreq_governor cpufreq_gov_powersave;
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_powersave)
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
extern struct cpufreq_governor cpufreq_gov_userspace;
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_userspace)
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
extern struct cpufreq_governor cpufreq_gov_ondemand;
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_ondemand)
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
extern struct cpufreq_governor cpufreq_gov_conservative;
#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_conservative)
#endif


/*********************************************************************
 *                     FREQUENCY TABLE HELPERS                       *
 *********************************************************************/

#define CPUFREQ_ENTRY_INVALID ~0
#define CPUFREQ_TABLE_END     ~1

struct cpufreq_frequency_table {
	unsigned int	index;     /* any */
	unsigned int	frequency; /* kHz - doesn't need to be in ascending
				    * order */
};

int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
				    struct cpufreq_frequency_table *table);

int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
				   struct cpufreq_frequency_table *table);

int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
				   struct cpufreq_frequency_table *table,
				   unsigned int target_freq,
				   unsigned int relation,
				   unsigned int *index);

/* the following 3 funtions are for cpufreq core use only */
struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
void   cpufreq_cpu_put (struct cpufreq_policy *data);

/* the following are really really optional */
extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;

void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, 
				      unsigned int cpu);

void cpufreq_frequency_table_put_attr(unsigned int cpu);


/*********************************************************************
 *                     UNIFIED DEBUG HELPERS                         *
 *********************************************************************/

#define CPUFREQ_DEBUG_CORE	1
#define CPUFREQ_DEBUG_DRIVER	2
#define CPUFREQ_DEBUG_GOVERNOR	4

#ifdef CONFIG_CPU_FREQ_DEBUG

extern void cpufreq_debug_printk(unsigned int type, const char *prefix, 
				 const char *fmt, ...);

#else

#define cpufreq_debug_printk(msg...) do { } while(0)

#endif /* CONFIG_CPU_FREQ_DEBUG */

#endif /* _LINUX_CPUFREQ_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/linux/cpufreq.h
	3	*
	4	* Copyright (C) 2001 Russell King
	5	* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
	6	*
1da177e4 LT	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#ifndef _LINUX_CPUFREQ_H
	12	#define _LINUX_CPUFREQ_H
	13
83933af4	14	#include <linux/mutex.h>
1da177e4 LT	15	#include <linux/notifier.h>
	16	#include <linux/threads.h>
	17	#include <linux/device.h>
	18	#include <linux/kobject.h>
	19	#include <linux/sysfs.h>
	20	#include <linux/completion.h>
	21	#include <linux/workqueue.h>
	22	#include <linux/cpumask.h>
4e57b681	23	#include <asm/div64.h>
1da177e4 LT	24
	25	#define CPUFREQ_NAME_LEN 16
	26
	27
	28	/*********************************************************************
	29	* CPUFREQ NOTIFIER INTERFACE *
	30	*********************************************************************/
	31
1da177e4 LT	32	#define CPUFREQ_TRANSITION_NOTIFIER (0)
	33	#define CPUFREQ_POLICY_NOTIFIER (1)
	34
6070b5de SS	35	#ifdef CONFIG_CPU_FREQ
	36	int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
	37	int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
	38	#else /* CONFIG_CPU_FREQ */
	39	static inline int cpufreq_register_notifier(struct notifier_block *nb,
	40	unsigned int list)
	41	{
	42	return 0;
	43	}
	44	static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
	45	unsigned int list)
	46	{
	47	return 0;
	48	}
	49	#endif /* CONFIG_CPU_FREQ */
1da177e4 LT	50
	51	/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
	52	* within the limits is used. If (cpufreq_driver->setpolicy> exists, these
	53	* two generic policies are available:
	54	*/
	55
	56	#define CPUFREQ_POLICY_POWERSAVE (1)
	57	#define CPUFREQ_POLICY_PERFORMANCE (2)
	58
	59	/* Frequency values here are CPU kHz so that hardware which doesn't run
	60	* with some frequencies can complain without having to guess what per
	61	* cent / per mille means.
b53cc6ea	62	* Maximum transition latency is in nanoseconds - if it's unknown,
1da177e4 LT	63	* CPUFREQ_ETERNAL shall be used.
	64	*/
	65
	66	struct cpufreq_governor;
	67
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;
	75	unsigned int transition_latency; /* in 10^(-9) s = nanoseconds */
	76	};
	77
	78	struct cpufreq_real_policy {
	79	unsigned int min; /* in kHz */
	80	unsigned int max; /* in kHz */
	81	unsigned int policy; /* see above */
	82	struct cpufreq_governor governor; / see below */
	83	};
	84
	85	struct cpufreq_policy {
835481d9 RR	86	cpumask_var_t cpus; /* CPUs requiring sw coordination */
835481d9 RR	87	cpumask_var_t related_cpus; /* CPUs with any coordination */
3b2d9942 VP	88	unsigned int shared_type; /* ANY or ALL affected CPUs
3b2d9942 VP	89	should set cpufreq */
1da177e4 LT	90	unsigned int cpu; /* cpu nr of registered CPU */
	91	struct cpufreq_cpuinfo cpuinfo;/* see above */
	92
	93	unsigned int min; /* in kHz */
	94	unsigned int max; /* in kHz */
	95	unsigned int cur; /* in kHz, only needed if cpufreq
	96	* governors are used */
	97	unsigned int policy; /* see above */
	98	struct cpufreq_governor governor; / see below */
	99
1da177e4 LT	100	struct work_struct update; /* if update_policy() needs to be
	101	* called, but you're in IRQ context */
	102
	103	struct cpufreq_real_policy user_policy;
	104
	105	struct kobject kobj;
	106	struct completion kobj_unregister;
	107	};
	108
	109	#define CPUFREQ_ADJUST (0)
	110	#define CPUFREQ_INCOMPATIBLE (1)
	111	#define CPUFREQ_NOTIFY (2)
a1531acd	112	#define CPUFREQ_START (3)
1da177e4	113
46f18e3a VP	114	#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
	115	#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
	116	#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
	117	#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
1da177e4 LT	118
	119	/****************** cpufreq transition notifiers *****************/
	120
	121	#define CPUFREQ_PRECHANGE (0)
	122	#define CPUFREQ_POSTCHANGE (1)
	123	#define CPUFREQ_RESUMECHANGE (8)
42d4dc3f	124	#define CPUFREQ_SUSPENDCHANGE (9)
1da177e4 LT	125
	126	struct cpufreq_freqs {
	127	unsigned int cpu; /* cpu nr */
	128	unsigned int old;
	129	unsigned int new;
	130	u8 flags; /* flags of cpufreq_driver, see below. */
	131	};
	132
	133
	134	/**
	135	* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
	136	* @old: old value
	137	* @div: divisor
	138	* @mult: multiplier
	139	*
	140	*
	141	* new = old * mult / div
	142	*/
	143	static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
	144	{
	145	#if BITS_PER_LONG == 32
	146
	147	u64 result = ((u64) old) * ((u64) mult);
	148	do_div(result, div);
	149	return (unsigned long) result;
	150
	151	#elif BITS_PER_LONG == 64
	152
	153	unsigned long result = old * ((u64) mult);
	154	result /= div;
	155	return result;
	156
	157	#endif
	158	};
	159
	160	/*********************************************************************
	161	* CPUFREQ GOVERNORS *
	162	*********************************************************************/
	163
	164	#define CPUFREQ_GOV_START 1
	165	#define CPUFREQ_GOV_STOP 2
	166	#define CPUFREQ_GOV_LIMITS 3
	167
	168	struct cpufreq_governor {
	169	char name[CPUFREQ_NAME_LEN];
	170	int (governor) (struct cpufreq_policy policy,
	171	unsigned int event);
9e76988e VP	172	ssize_t (show_setspeed) (struct cpufreq_policy policy,
	173	char *buf);
	174	int (store_setspeed) (struct cpufreq_policy policy,
	175	unsigned int freq);
1c256245 TR	176	unsigned int max_transition_latency; /* HW must be able to switch to
	177	next freq faster than this value in nano secs or we
	178	will fallback to performance governor */
1da177e4 LT	179	struct list_head governor_list;
	180	struct module *owner;
	181	};
	182
	183	/* pass a target to the cpufreq driver
	184	*/
	185	extern int cpufreq_driver_target(struct cpufreq_policy *policy,
	186	unsigned int target_freq,
	187	unsigned int relation);
	188	extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
	189	unsigned int target_freq,
	190	unsigned int relation);
	191
	192
bf0b90e3	193	extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
bf0b90e3	194	unsigned int cpu);
dfde5d62	195
1da177e4 LT	196	int cpufreq_register_governor(struct cpufreq_governor *governor);
	197	void cpufreq_unregister_governor(struct cpufreq_governor *governor);
	198
5a01f2e8 VP	199	int lock_policy_rwsem_read(int cpu);
	200	int lock_policy_rwsem_write(int cpu);
	201	void unlock_policy_rwsem_read(int cpu);
	202	void unlock_policy_rwsem_write(int cpu);
	203
1da177e4 LT	204
	205	/*********************************************************************
	206	* CPUFREQ DRIVER INTERFACE *
	207	*********************************************************************/
	208
	209	#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
	210	#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
	211
	212	struct freq_attr;
	213
	214	struct cpufreq_driver {
	215	struct module *owner;
	216	char name[CPUFREQ_NAME_LEN];
	217	u8 flags;
	218
	219	/* needed by all drivers */
	220	int (init) (struct cpufreq_policy policy);
	221	int (verify) (struct cpufreq_policy policy);
	222
	223	/* define one out of two */
	224	int (setpolicy) (struct cpufreq_policy policy);
	225	int (target) (struct cpufreq_policy policy,
	226	unsigned int target_freq,
	227	unsigned int relation);
	228
	229	/* should be defined, if possible */
	230	unsigned int (*get) (unsigned int cpu);
	231
	232	/* optional */
bf0b90e3	233	unsigned int (getavg) (struct cpufreq_policy policy,
bf0b90e3	234	unsigned int cpu);
e2f74f35	235	int (bios_limit) (int cpu, unsigned int limit);
bf0b90e3	236
1da177e4	237	int (exit) (struct cpufreq_policy policy);
e00d9967	238	int (suspend) (struct cpufreq_policy policy, pm_message_t pmsg);
1da177e4 LT	239	int (resume) (struct cpufreq_policy policy);
	240	struct freq_attr **attr;
	241	};
	242
	243	/* flags */
	244
	245	#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
	246	* all ->init() calls failed */
	247	#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
	248	* "constants" aren't affected by
	249	* frequency transitions */
42d4dc3f BH	250	#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
42d4dc3f BH	251	* mismatches */
1da177e4	252
221dee28 LT	253	int cpufreq_register_driver(struct cpufreq_driver *driver_data);
221dee28 LT	254	int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
1da177e4 LT	255
	256
	257	void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
	258
	259
	260	static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
	261	{
	262	if (policy->min < min)
	263	policy->min = min;
	264	if (policy->max < min)
	265	policy->max = min;
	266	if (policy->min > max)
	267	policy->min = max;
	268	if (policy->max > max)
	269	policy->max = max;
	270	if (policy->min > policy->max)
	271	policy->min = policy->max;
	272	return;
	273	}
	274
	275	struct freq_attr {
	276	struct attribute attr;
	277	ssize_t (show)(struct cpufreq_policy , char *);
	278	ssize_t (store)(struct cpufreq_policy , const char *, size_t count);
	279	};
	280
6dad2a29 BP	281	#define cpufreq_freq_attr_ro(_name) \
	282	static struct freq_attr _name = \
	283	__ATTR(_name, 0444, show_##_name, NULL)
	284
	285	#define cpufreq_freq_attr_ro_perm(_name, _perm) \
	286	static struct freq_attr _name = \
	287	__ATTR(_name, _perm, show_##_name, NULL)
	288
	289	#define cpufreq_freq_attr_ro_old(_name) \
	290	static struct freq_attr _name##_old = \
	291	__ATTR(_name, 0444, show_##_name##_old, NULL)
	292
	293	#define cpufreq_freq_attr_rw(_name) \
	294	static struct freq_attr _name = \
	295	__ATTR(_name, 0644, show_##_name, store_##_name)
	296
	297	#define cpufreq_freq_attr_rw_old(_name) \
	298	static struct freq_attr _name##_old = \
	299	__ATTR(_name, 0644, show_##_name##_old, store_##_name##_old)
	300
	301
8aa84ad8 TR	302	struct global_attr {
	303	struct attribute attr;
	304	ssize_t (show)(struct kobject kobj,
	305	struct attribute attr, char buf);
	306	ssize_t (store)(struct kobject a, struct attribute *b,
	307	const char *c, size_t count);
	308	};
1da177e4	309
6dad2a29 BP	310	#define define_one_global_ro(_name) \
	311	static struct global_attr _name = \
	312	__ATTR(_name, 0444, show_##_name, NULL)
	313
	314	#define define_one_global_rw(_name) \
	315	static struct global_attr _name = \
	316	__ATTR(_name, 0644, show_##_name, store_##_name)
	317
	318
1da177e4 LT	319	/*********************************************************************
	320	* CPUFREQ 2.6. INTERFACE *
	321	*********************************************************************/
1da177e4 LT	322	int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
	323	int cpufreq_update_policy(unsigned int cpu);
	324
2eca40a8	325	#ifdef CONFIG_CPU_FREQ
ff0ce684 LT	326	/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
ff0ce684 LT	327	unsigned int cpufreq_get(unsigned int cpu);
2eca40a8 RD	328	#else
	329	static inline unsigned int cpufreq_get(unsigned int cpu)
	330	{
	331	return 0;
	332	}
	333	#endif
1da177e4	334
ff0ce684	335	/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
95235ca2 VP	336	#ifdef CONFIG_CPU_FREQ
	337	unsigned int cpufreq_quick_get(unsigned int cpu);
	338	#else
	339	static inline unsigned int cpufreq_quick_get(unsigned int cpu)
	340	{
	341	return 0;
	342	}
	343	#endif
	344
1da177e4 LT	345
	346	/*********************************************************************
	347	* CPUFREQ DEFAULT GOVERNOR *
	348	*********************************************************************/
	349
	350
1c256245 TR	351	/*
	352	Performance governor is fallback governor if any other gov failed to
	353	auto load due latency restrictions
	354	*/
6afde10c	355	#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
1da177e4	356	extern struct cpufreq_governor cpufreq_gov_performance;
6afde10c	357	#endif
1c256245 TR	358	#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
1c256245 TR	359	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
30d221db AG	360	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
	361	extern struct cpufreq_governor cpufreq_gov_powersave;
	362	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
1da177e4 LT	363	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
1da177e4 LT	364	extern struct cpufreq_governor cpufreq_gov_userspace;
1c256245 TR	365	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
	366	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
	367	extern struct cpufreq_governor cpufreq_gov_ondemand;
	368	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
	369	#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
	370	extern struct cpufreq_governor cpufreq_gov_conservative;
	371	#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
1da177e4 LT	372	#endif
	373
	374
	375	/*********************************************************************
	376	* FREQUENCY TABLE HELPERS *
	377	*********************************************************************/
	378
	379	#define CPUFREQ_ENTRY_INVALID ~0
	380	#define CPUFREQ_TABLE_END ~1
	381
	382	struct cpufreq_frequency_table {
	383	unsigned int index; /* any */
	384	unsigned int frequency; /* kHz - doesn't need to be in ascending
	385	* order */
	386	};
	387
	388	int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
	389	struct cpufreq_frequency_table *table);
	390
	391	int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
	392	struct cpufreq_frequency_table *table);
	393
	394	int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
	395	struct cpufreq_frequency_table *table,
	396	unsigned int target_freq,
	397	unsigned int relation,
	398	unsigned int *index);
	399
	400	/* the following 3 funtions are for cpufreq core use only */
	401	struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
	402	struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
	403	void cpufreq_cpu_put (struct cpufreq_policy *data);
	404
	405	/* the following are really really optional */
	406	extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
	407
	408	void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
	409	unsigned int cpu);
	410
	411	void cpufreq_frequency_table_put_attr(unsigned int cpu);
	412
	413
	414	/*********************************************************************
	415	* UNIFIED DEBUG HELPERS *
	416	*********************************************************************/
	417
	418	#define CPUFREQ_DEBUG_CORE 1
	419	#define CPUFREQ_DEBUG_DRIVER 2
	420	#define CPUFREQ_DEBUG_GOVERNOR 4
	421
	422	#ifdef CONFIG_CPU_FREQ_DEBUG
	423
	424	extern void cpufreq_debug_printk(unsigned int type, const char *prefix,
	425	const char *fmt, ...);
	426
	427	#else
	428
	429	#define cpufreq_debug_printk(msg...) do { } while(0)
	430
	431	#endif /* CONFIG_CPU_FREQ_DEBUG */
	432
	433	#endif /* _LINUX_CPUFREQ_H */