Merge branch 'lsk-v4.4-eas-v5.2' of git://git.linaro.org/arm/eas/kernel.git
[firefly-linux-kernel-4.4.55.git] / include / linux / cpufreq.h
1 /*
2  * linux/include/linux/cpufreq.h
3  *
4  * Copyright (C) 2001 Russell King
5  *           (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
6  *
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
14 #include <linux/clk.h>
15 #include <linux/cpumask.h>
16 #include <linux/completion.h>
17 #include <linux/kobject.h>
18 #include <linux/notifier.h>
19 #include <linux/spinlock.h>
20 #include <linux/sysfs.h>
21
22 /*********************************************************************
23  *                        CPUFREQ INTERFACE                          *
24  *********************************************************************/
25 /*
26  * Frequency values here are CPU kHz
27  *
28  * Maximum transition latency is in nanoseconds - if it's unknown,
29  * CPUFREQ_ETERNAL shall be used.
30  */
31
32 #define CPUFREQ_ETERNAL                 (-1)
33 #define CPUFREQ_NAME_LEN                16
34 /* Print length for names. Extra 1 space for accomodating '\n' in prints */
35 #define CPUFREQ_NAME_PLEN               (CPUFREQ_NAME_LEN + 1)
36
37 struct cpufreq_governor;
38
39 struct cpufreq_freqs {
40         unsigned int cpu;       /* cpu nr */
41         unsigned int old;
42         unsigned int new;
43         u8 flags;               /* flags of cpufreq_driver, see below. */
44 };
45
46 struct cpufreq_cpuinfo {
47         unsigned int            max_freq;
48         unsigned int            min_freq;
49
50         /* in 10^(-9) s = nanoseconds */
51         unsigned int            transition_latency;
52 };
53
54 struct cpufreq_user_policy {
55         unsigned int            min;    /* in kHz */
56         unsigned int            max;    /* in kHz */
57 };
58
59 struct cpufreq_policy {
60         /* CPUs sharing clock, require sw coordination */
61         cpumask_var_t           cpus;   /* Online CPUs only */
62         cpumask_var_t           related_cpus; /* Online + Offline CPUs */
63         cpumask_var_t           real_cpus; /* Related and present */
64
65         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
66                                                 should set cpufreq */
67         unsigned int            cpu;    /* cpu managing this policy, must be online */
68
69         struct clk              *clk;
70         struct cpufreq_cpuinfo  cpuinfo;/* see above */
71
72         unsigned int            min;    /* in kHz */
73         unsigned int            max;    /* in kHz */
74         unsigned int            cur;    /* in kHz, only needed if cpufreq
75                                          * governors are used */
76         unsigned int            restore_freq; /* = policy->cur before transition */
77         unsigned int            suspend_freq; /* freq to set during suspend */
78
79         unsigned int            policy; /* see above */
80         unsigned int            last_policy; /* policy before unplug */
81         struct cpufreq_governor *governor; /* see below */
82         void                    *governor_data;
83         bool                    governor_enabled; /* governor start/stop flag */
84         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
85
86         struct work_struct      update; /* if update_policy() needs to be
87                                          * called, but you're in IRQ context */
88
89         struct cpufreq_user_policy user_policy;
90         struct cpufreq_frequency_table  *freq_table;
91
92         struct list_head        policy_list;
93         struct kobject          kobj;
94         struct completion       kobj_unregister;
95
96         /*
97          * The rules for this semaphore:
98          * - Any routine that wants to read from the policy structure will
99          *   do a down_read on this semaphore.
100          * - Any routine that will write to the policy structure and/or may take away
101          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
102          *   mode before doing so.
103          *
104          * Additional rules:
105          * - Lock should not be held across
106          *     __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT);
107          */
108         struct rw_semaphore     rwsem;
109
110         /* Synchronization for frequency transitions */
111         bool                    transition_ongoing; /* Tracks transition status */
112         spinlock_t              transition_lock;
113         wait_queue_head_t       transition_wait;
114         struct task_struct      *transition_task; /* Task which is doing the transition */
115
116         /* cpufreq-stats */
117         struct cpufreq_stats    *stats;
118
119         /* For cpufreq driver's internal use */
120         void                    *driver_data;
121 };
122
123 /* Only for ACPI */
124 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
125 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
126 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
127 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
128
129 #ifdef CONFIG_CPU_FREQ
130 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
131 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
132 void cpufreq_cpu_put(struct cpufreq_policy *policy);
133 #else
134 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
135 {
136         return NULL;
137 }
138 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
139 {
140         return NULL;
141 }
142 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
143 #endif
144
145 static inline bool policy_is_shared(struct cpufreq_policy *policy)
146 {
147         return cpumask_weight(policy->cpus) > 1;
148 }
149
150 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
151 extern struct kobject *cpufreq_global_kobject;
152
153 #ifdef CONFIG_CPU_FREQ
154 unsigned int cpufreq_get(unsigned int cpu);
155 unsigned int cpufreq_quick_get(unsigned int cpu);
156 unsigned int cpufreq_quick_get_max(unsigned int cpu);
157 void disable_cpufreq(void);
158
159 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
160 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
161 int cpufreq_update_policy(unsigned int cpu);
162 bool have_governor_per_policy(void);
163 bool cpufreq_driver_is_slow(void);
164 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
165 #else
166 static inline unsigned int cpufreq_get(unsigned int cpu)
167 {
168         return 0;
169 }
170 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
171 {
172         return 0;
173 }
174 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
175 {
176         return 0;
177 }
178 static inline void disable_cpufreq(void) { }
179 #endif
180
181 /*********************************************************************
182  *                      CPUFREQ DRIVER INTERFACE                     *
183  *********************************************************************/
184
185 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
186 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
187 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
188
189 struct freq_attr {
190         struct attribute attr;
191         ssize_t (*show)(struct cpufreq_policy *, char *);
192         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
193 };
194
195 #define cpufreq_freq_attr_ro(_name)             \
196 static struct freq_attr _name =                 \
197 __ATTR(_name, 0444, show_##_name, NULL)
198
199 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
200 static struct freq_attr _name =                 \
201 __ATTR(_name, _perm, show_##_name, NULL)
202
203 #define cpufreq_freq_attr_rw(_name)             \
204 static struct freq_attr _name =                 \
205 __ATTR(_name, 0644, show_##_name, store_##_name)
206
207 struct global_attr {
208         struct attribute attr;
209         ssize_t (*show)(struct kobject *kobj,
210                         struct attribute *attr, char *buf);
211         ssize_t (*store)(struct kobject *a, struct attribute *b,
212                          const char *c, size_t count);
213 };
214
215 #define define_one_global_ro(_name)             \
216 static struct global_attr _name =               \
217 __ATTR(_name, 0444, show_##_name, NULL)
218
219 #define define_one_global_rw(_name)             \
220 static struct global_attr _name =               \
221 __ATTR(_name, 0644, show_##_name, store_##_name)
222
223
224 struct cpufreq_driver {
225         char            name[CPUFREQ_NAME_LEN];
226         u8              flags;
227         void            *driver_data;
228
229         /* needed by all drivers */
230         int             (*init)(struct cpufreq_policy *policy);
231         int             (*verify)(struct cpufreq_policy *policy);
232
233         /* define one out of two */
234         int             (*setpolicy)(struct cpufreq_policy *policy);
235
236         /*
237          * On failure, should always restore frequency to policy->restore_freq
238          * (i.e. old freq).
239          */
240         int             (*target)(struct cpufreq_policy *policy,
241                                   unsigned int target_freq,
242                                   unsigned int relation);       /* Deprecated */
243         int             (*target_index)(struct cpufreq_policy *policy,
244                                         unsigned int index);
245         /*
246          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
247          * unset.
248          *
249          * get_intermediate should return a stable intermediate frequency
250          * platform wants to switch to and target_intermediate() should set CPU
251          * to to that frequency, before jumping to the frequency corresponding
252          * to 'index'. Core will take care of sending notifications and driver
253          * doesn't have to handle them in target_intermediate() or
254          * target_index().
255          *
256          * Drivers can return '0' from get_intermediate() in case they don't
257          * wish to switch to intermediate frequency for some target frequency.
258          * In that case core will directly call ->target_index().
259          */
260         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
261                                             unsigned int index);
262         int             (*target_intermediate)(struct cpufreq_policy *policy,
263                                                unsigned int index);
264
265         /* should be defined, if possible */
266         unsigned int    (*get)(unsigned int cpu);
267
268         /* optional */
269         int             (*bios_limit)(int cpu, unsigned int *limit);
270
271         int             (*exit)(struct cpufreq_policy *policy);
272         void            (*stop_cpu)(struct cpufreq_policy *policy);
273         int             (*suspend)(struct cpufreq_policy *policy);
274         int             (*resume)(struct cpufreq_policy *policy);
275
276         /* Will be called after the driver is fully initialized */
277         void            (*ready)(struct cpufreq_policy *policy);
278
279         struct freq_attr **attr;
280
281         /* platform specific boost support code */
282         bool            boost_supported;
283         bool            boost_enabled;
284         int             (*set_boost)(int state);
285 };
286
287 /* flags */
288 #define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
289                                                    all ->init() calls failed */
290 #define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
291                                                    kernel "constants" aren't
292                                                    affected by frequency
293                                                    transitions */
294 #define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
295                                                    speed mismatches */
296
297 /*
298  * This should be set by platforms having multiple clock-domains, i.e.
299  * supporting multiple policies. With this sysfs directories of governor would
300  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
301  * governor with different tunables for different clusters.
302  */
303 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
304
305 /*
306  * Driver will do POSTCHANGE notifications from outside of their ->target()
307  * routine and so must set cpufreq_driver->flags with this flag, so that core
308  * can handle them specially.
309  */
310 #define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
311
312 /*
313  * Set by drivers which want cpufreq core to check if CPU is running at a
314  * frequency present in freq-table exposed by the driver. For these drivers if
315  * CPU is found running at an out of table freq, we will try to set it to a freq
316  * from the table. And if that fails, we will stop further boot process by
317  * issuing a BUG_ON().
318  */
319 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
320
321 /*
322  * Indicates that it is safe to call cpufreq_driver_target from
323  * non-interruptable context in scheduler hot paths.  Drivers must
324  * opt-in to this flag, as the safe default is that they might sleep
325  * or be too slow for hot path use.
326  */
327 #define CPUFREQ_DRIVER_FAST             (1 << 6)
328
329 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
330 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
331
332 const char *cpufreq_get_current_driver(void);
333 void *cpufreq_get_driver_data(void);
334
335 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
336                 unsigned int min, unsigned int max)
337 {
338         if (policy->min < min)
339                 policy->min = min;
340         if (policy->max < min)
341                 policy->max = min;
342         if (policy->min > max)
343                 policy->min = max;
344         if (policy->max > max)
345                 policy->max = max;
346         if (policy->min > policy->max)
347                 policy->min = policy->max;
348         return;
349 }
350
351 static inline void
352 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
353 {
354         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
355                         policy->cpuinfo.max_freq);
356 }
357
358 #ifdef CONFIG_CPU_FREQ
359 void cpufreq_suspend(void);
360 void cpufreq_resume(void);
361 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
362 #else
363 static inline void cpufreq_suspend(void) {}
364 static inline void cpufreq_resume(void) {}
365 #endif
366
367 /*********************************************************************
368  *                     CPUFREQ NOTIFIER INTERFACE                    *
369  *********************************************************************/
370
371 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
372 #define CPUFREQ_POLICY_NOTIFIER         (1)
373
374 /* Transition notifiers */
375 #define CPUFREQ_PRECHANGE               (0)
376 #define CPUFREQ_POSTCHANGE              (1)
377
378 /* Policy Notifiers  */
379 #define CPUFREQ_ADJUST                  (0)
380 #define CPUFREQ_NOTIFY                  (1)
381 #define CPUFREQ_START                   (2)
382 #define CPUFREQ_CREATE_POLICY           (3)
383 #define CPUFREQ_REMOVE_POLICY           (4)
384
385 #ifdef CONFIG_CPU_FREQ
386 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
387 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
388
389 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
390                 struct cpufreq_freqs *freqs);
391 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
392                 struct cpufreq_freqs *freqs, int transition_failed);
393
394 #else /* CONFIG_CPU_FREQ */
395 static inline int cpufreq_register_notifier(struct notifier_block *nb,
396                                                 unsigned int list)
397 {
398         return 0;
399 }
400 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
401                                                 unsigned int list)
402 {
403         return 0;
404 }
405 #endif /* !CONFIG_CPU_FREQ */
406
407 /**
408  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
409  * safe)
410  * @old:   old value
411  * @div:   divisor
412  * @mult:  multiplier
413  *
414  *
415  * new = old * mult / div
416  */
417 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
418                 u_int mult)
419 {
420 #if BITS_PER_LONG == 32
421         u64 result = ((u64) old) * ((u64) mult);
422         do_div(result, div);
423         return (unsigned long) result;
424
425 #elif BITS_PER_LONG == 64
426         unsigned long result = old * ((u64) mult);
427         result /= div;
428         return result;
429 #endif
430 }
431
432 /*********************************************************************
433  *                          CPUFREQ GOVERNORS                        *
434  *********************************************************************/
435
436 /*
437  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
438  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
439  * two generic policies are available:
440  */
441 #define CPUFREQ_POLICY_POWERSAVE        (1)
442 #define CPUFREQ_POLICY_PERFORMANCE      (2)
443
444 /* Governor Events */
445 #define CPUFREQ_GOV_START       1
446 #define CPUFREQ_GOV_STOP        2
447 #define CPUFREQ_GOV_LIMITS      3
448 #define CPUFREQ_GOV_POLICY_INIT 4
449 #define CPUFREQ_GOV_POLICY_EXIT 5
450
451 struct cpufreq_governor {
452         char    name[CPUFREQ_NAME_LEN];
453         int     initialized;
454         int     (*governor)     (struct cpufreq_policy *policy,
455                                  unsigned int event);
456         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
457                                          char *buf);
458         int     (*store_setspeed)       (struct cpufreq_policy *policy,
459                                          unsigned int freq);
460         unsigned int max_transition_latency; /* HW must be able to switch to
461                         next freq faster than this value in nano secs or we
462                         will fallback to performance governor */
463         struct list_head        governor_list;
464         struct module           *owner;
465 };
466
467 /* Pass a target to the cpufreq driver */
468 int cpufreq_driver_target(struct cpufreq_policy *policy,
469                                  unsigned int target_freq,
470                                  unsigned int relation);
471 int __cpufreq_driver_target(struct cpufreq_policy *policy,
472                                    unsigned int target_freq,
473                                    unsigned int relation);
474 int cpufreq_register_governor(struct cpufreq_governor *governor);
475 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
476
477 /* CPUFREQ DEFAULT GOVERNOR */
478 /*
479  * Performance governor is fallback governor if any other gov failed to auto
480  * load due latency restrictions
481  */
482 #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
483 extern struct cpufreq_governor cpufreq_gov_performance;
484 #endif
485 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
486 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_performance)
487 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
488 extern struct cpufreq_governor cpufreq_gov_powersave;
489 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_powersave)
490 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
491 extern struct cpufreq_governor cpufreq_gov_userspace;
492 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_userspace)
493 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
494 extern struct cpufreq_governor cpufreq_gov_ondemand;
495 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_ondemand)
496 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
497 extern struct cpufreq_governor cpufreq_gov_conservative;
498 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_conservative)
499 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE)
500 extern struct cpufreq_governor cpufreq_gov_interactive;
501 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_interactive)
502 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_SCHED)
503 extern struct cpufreq_governor cpufreq_gov_sched;
504 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_sched)
505 #endif
506
507 /*********************************************************************
508  *                     FREQUENCY TABLE HELPERS                       *
509  *********************************************************************/
510
511 /* Special Values of .frequency field */
512 #define CPUFREQ_ENTRY_INVALID   ~0u
513 #define CPUFREQ_TABLE_END       ~1u
514 /* Special Values of .flags field */
515 #define CPUFREQ_BOOST_FREQ      (1 << 0)
516
517 struct cpufreq_frequency_table {
518         unsigned int    flags;
519         unsigned int    driver_data; /* driver specific data, not used by core */
520         unsigned int    frequency; /* kHz - doesn't need to be in ascending
521                                     * order */
522 };
523
524 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
525 int dev_pm_opp_init_cpufreq_table(struct device *dev,
526                                   struct cpufreq_frequency_table **table);
527 void dev_pm_opp_free_cpufreq_table(struct device *dev,
528                                    struct cpufreq_frequency_table **table);
529 #else
530 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
531                                                 struct cpufreq_frequency_table
532                                                 **table)
533 {
534         return -EINVAL;
535 }
536
537 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
538                                                  struct cpufreq_frequency_table
539                                                  **table)
540 {
541 }
542 #endif
543
544 static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos)
545 {
546         while ((*pos)->frequency != CPUFREQ_TABLE_END)
547                 if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID)
548                         return true;
549                 else
550                         (*pos)++;
551         return false;
552 }
553
554 /*
555  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
556  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
557  * @table:      the cpufreq_frequency_table * to iterate over.
558  */
559
560 #define cpufreq_for_each_entry(pos, table)      \
561         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
562
563 /*
564  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
565  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
566  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
567  * @table:      the cpufreq_frequency_table * to iterate over.
568  */
569
570 #define cpufreq_for_each_valid_entry(pos, table)        \
571         for (pos = table; cpufreq_next_valid(&pos); pos++)
572
573 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
574                                     struct cpufreq_frequency_table *table);
575
576 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
577                                    struct cpufreq_frequency_table *table);
578 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
579
580 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
581                                    struct cpufreq_frequency_table *table,
582                                    unsigned int target_freq,
583                                    unsigned int relation,
584                                    unsigned int *index);
585 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
586                 unsigned int freq);
587
588 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
589
590 #ifdef CONFIG_CPU_FREQ
591 int cpufreq_boost_trigger_state(int state);
592 int cpufreq_boost_supported(void);
593 int cpufreq_boost_enabled(void);
594 int cpufreq_enable_boost_support(void);
595 bool policy_has_boost_freq(struct cpufreq_policy *policy);
596 #else
597 static inline int cpufreq_boost_trigger_state(int state)
598 {
599         return 0;
600 }
601 static inline int cpufreq_boost_supported(void)
602 {
603         return 0;
604 }
605 static inline int cpufreq_boost_enabled(void)
606 {
607         return 0;
608 }
609
610 static inline int cpufreq_enable_boost_support(void)
611 {
612         return -EINVAL;
613 }
614
615 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
616 {
617         return false;
618 }
619 #endif
620 /* the following funtion is for cpufreq core use only */
621 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
622
623 /* the following are really really optional */
624 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
625 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
626 extern struct freq_attr *cpufreq_generic_attr[];
627 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
628                                       struct cpufreq_frequency_table *table);
629
630 unsigned int cpufreq_generic_get(unsigned int cpu);
631 int cpufreq_generic_init(struct cpufreq_policy *policy,
632                 struct cpufreq_frequency_table *table,
633                 unsigned int transition_latency);
634
635 struct sched_domain;
636 unsigned long cpufreq_scale_freq_capacity(struct sched_domain *sd, int cpu);
637 unsigned long cpufreq_scale_max_freq_capacity(int cpu);
638 #endif /* _LINUX_CPUFREQ_H */