http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/linux/cpufreq.h

/* * linux/include/linux/cpufreq.h * * Copyright (C) 2001 Russell King * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> * * * $Id: cpufreq.h,v 1.36 2003/01/20 17:31:48 db Exp $ * * 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/config.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 * *********************************************************************/ int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); #define CPUFREQ_TRANSITION_NOTIFIER (0) #define CPUFREQ_POLICY_NOTIFIER (1) /* 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; #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_t cpus; /* affected CPUs */ 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 mutex lock; /* CPU ->setpolicy or ->target may only be called once a time */ 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) /******************** 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); 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); /* pass an event to the cpufreq governor */ int cpufreq_governor(unsigned int cpu, unsigned int event); 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 */ 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); }; /********************************************************************* * CPUFREQ 2.6. INTERFACE * *********************************************************************/ int cpufreq_set_policy(struct cpufreq_policy *policy); int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); int cpufreq_update_policy(unsigned int cpu); /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ unsigned int cpufreq_get(unsigned int cpu); /* 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 * *********************************************************************/ #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE extern struct cpufreq_governor cpufreq_gov_performance; #define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_performance #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) extern struct cpufreq_governor cpufreq_gov_userspace; #define CPUFREQ_DEFAULT_GOVERNOR &cpufreq_gov_userspace #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 */