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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/include/linux/cpufreq.h
4 *
5 * Copyright (C) 2001 Russell King
6 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
7 */
8#ifndef _LINUX_CPUFREQ_H
9#define _LINUX_CPUFREQ_H
10
11#include <linux/clk.h>
12#include <linux/cpumask.h>
13#include <linux/completion.h>
14#include <linux/kobject.h>
15#include <linux/notifier.h>
16#include <linux/pm_qos.h>
17#include <linux/spinlock.h>
18#include <linux/sysfs.h>
19
20/*********************************************************************
21 * CPUFREQ INTERFACE *
22 *********************************************************************/
23/*
24 * Frequency values here are CPU kHz
25 *
26 * Maximum transition latency is in nanoseconds - if it's unknown,
27 * CPUFREQ_ETERNAL shall be used.
28 */
29
30#define CPUFREQ_ETERNAL (-1)
31#define CPUFREQ_NAME_LEN 16
32/* Print length for names. Extra 1 space for accommodating '\n' in prints */
33#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
34
35struct cpufreq_governor;
36
37enum cpufreq_table_sorting {
38 CPUFREQ_TABLE_UNSORTED,
39 CPUFREQ_TABLE_SORTED_ASCENDING,
40 CPUFREQ_TABLE_SORTED_DESCENDING
41};
42
43struct cpufreq_cpuinfo {
44 unsigned int max_freq;
45 unsigned int min_freq;
46
47 /* in 10^(-9) s = nanoseconds */
48 unsigned int transition_latency;
49};
50
51struct cpufreq_policy {
52 /* CPUs sharing clock, require sw coordination */
53 cpumask_var_t cpus; /* Online CPUs only */
54 cpumask_var_t related_cpus; /* Online + Offline CPUs */
55 cpumask_var_t real_cpus; /* Related and present */
56
57 unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
58 should set cpufreq */
59 unsigned int cpu; /* cpu managing this policy, must be online */
60
61 struct clk *clk;
62 struct cpufreq_cpuinfo cpuinfo;/* see above */
63
64 unsigned int min; /* in kHz */
65 unsigned int max; /* in kHz */
66 unsigned int cur; /* in kHz, only needed if cpufreq
67 * governors are used */
68 unsigned int restore_freq; /* = policy->cur before transition */
69 unsigned int suspend_freq; /* freq to set during suspend */
70
71 unsigned int policy; /* see above */
72 unsigned int last_policy; /* policy before unplug */
73 struct cpufreq_governor *governor; /* see below */
74 void *governor_data;
75 char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
76
77 struct work_struct update; /* if update_policy() needs to be
78 * called, but you're in IRQ context */
79
80 struct freq_constraints constraints;
81 struct freq_qos_request *min_freq_req;
82 struct freq_qos_request *max_freq_req;
83
84 struct cpufreq_frequency_table *freq_table;
85 enum cpufreq_table_sorting freq_table_sorted;
86
87 struct list_head policy_list;
88 struct kobject kobj;
89 struct completion kobj_unregister;
90
91 /*
92 * The rules for this semaphore:
93 * - Any routine that wants to read from the policy structure will
94 * do a down_read on this semaphore.
95 * - Any routine that will write to the policy structure and/or may take away
96 * the policy altogether (eg. CPU hotplug), will hold this lock in write
97 * mode before doing so.
98 */
99 struct rw_semaphore rwsem;
100
101 /*
102 * Fast switch flags:
103 * - fast_switch_possible should be set by the driver if it can
104 * guarantee that frequency can be changed on any CPU sharing the
105 * policy and that the change will affect all of the policy CPUs then.
106 * - fast_switch_enabled is to be set by governors that support fast
107 * frequency switching with the help of cpufreq_enable_fast_switch().
108 */
109 bool fast_switch_possible;
110 bool fast_switch_enabled;
111
112 /*
113 * Preferred average time interval between consecutive invocations of
114 * the driver to set the frequency for this policy. To be set by the
115 * scaling driver (0, which is the default, means no preference).
116 */
117 unsigned int transition_delay_us;
118
119 /*
120 * Remote DVFS flag (Not added to the driver structure as we don't want
121 * to access another structure from scheduler hotpath).
122 *
123 * Should be set if CPUs can do DVFS on behalf of other CPUs from
124 * different cpufreq policies.
125 */
126 bool dvfs_possible_from_any_cpu;
127
128 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
129 unsigned int cached_target_freq;
130 unsigned int cached_resolved_idx;
131
132 /* Synchronization for frequency transitions */
133 bool transition_ongoing; /* Tracks transition status */
134 spinlock_t transition_lock;
135 wait_queue_head_t transition_wait;
136 struct task_struct *transition_task; /* Task which is doing the transition */
137
138 /* cpufreq-stats */
139 struct cpufreq_stats *stats;
140
141 /* For cpufreq driver's internal use */
142 void *driver_data;
143
144 /* Pointer to the cooling device if used for thermal mitigation */
145 struct thermal_cooling_device *cdev;
146
147 struct notifier_block nb_min;
148 struct notifier_block nb_max;
149};
150
151/*
152 * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
153 * callback for sanitization. That callback is only expected to modify the min
154 * and max values, if necessary, and specifically it must not update the
155 * frequency table.
156 */
157struct cpufreq_policy_data {
158 struct cpufreq_cpuinfo cpuinfo;
159 struct cpufreq_frequency_table *freq_table;
160 unsigned int cpu;
161 unsigned int min; /* in kHz */
162 unsigned int max; /* in kHz */
163};
164
165struct cpufreq_freqs {
166 struct cpufreq_policy *policy;
167 unsigned int old;
168 unsigned int new;
169 u8 flags; /* flags of cpufreq_driver, see below. */
170};
171
172/* Only for ACPI */
173#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
174#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
175#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
176#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
177
178#ifdef CONFIG_CPU_FREQ
179struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
180struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
181void cpufreq_cpu_put(struct cpufreq_policy *policy);
182#else
183static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
184{
185 return NULL;
186}
187static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
188{
189 return NULL;
190}
191static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
192#endif
193
194static inline bool policy_is_inactive(struct cpufreq_policy *policy)
195{
196 return cpumask_empty(policy->cpus);
197}
198
199static inline bool policy_is_shared(struct cpufreq_policy *policy)
200{
201 return cpumask_weight(policy->cpus) > 1;
202}
203
204#ifdef CONFIG_CPU_FREQ
205unsigned int cpufreq_get(unsigned int cpu);
206unsigned int cpufreq_quick_get(unsigned int cpu);
207unsigned int cpufreq_quick_get_max(unsigned int cpu);
208unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
209void disable_cpufreq(void);
210
211u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
212
213struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu);
214void cpufreq_cpu_release(struct cpufreq_policy *policy);
215int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
216void refresh_frequency_limits(struct cpufreq_policy *policy);
217void cpufreq_update_policy(unsigned int cpu);
218void cpufreq_update_limits(unsigned int cpu);
219bool have_governor_per_policy(void);
220struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
221void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
222void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
223#else
224static inline unsigned int cpufreq_get(unsigned int cpu)
225{
226 return 0;
227}
228static inline unsigned int cpufreq_quick_get(unsigned int cpu)
229{
230 return 0;
231}
232static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
233{
234 return 0;
235}
236static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
237{
238 return 0;
239}
240static inline void disable_cpufreq(void) { }
241#endif
242
243#ifdef CONFIG_CPU_FREQ_STAT
244void cpufreq_stats_create_table(struct cpufreq_policy *policy);
245void cpufreq_stats_free_table(struct cpufreq_policy *policy);
246void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
247 unsigned int new_freq);
248#else
249static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
250static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
251static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
252 unsigned int new_freq) { }
253#endif /* CONFIG_CPU_FREQ_STAT */
254
255/*********************************************************************
256 * CPUFREQ DRIVER INTERFACE *
257 *********************************************************************/
258
259#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
260#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
261#define CPUFREQ_RELATION_C 2 /* closest frequency to target */
262
263struct freq_attr {
264 struct attribute attr;
265 ssize_t (*show)(struct cpufreq_policy *, char *);
266 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
267};
268
269#define cpufreq_freq_attr_ro(_name) \
270static struct freq_attr _name = \
271__ATTR(_name, 0444, show_##_name, NULL)
272
273#define cpufreq_freq_attr_ro_perm(_name, _perm) \
274static struct freq_attr _name = \
275__ATTR(_name, _perm, show_##_name, NULL)
276
277#define cpufreq_freq_attr_rw(_name) \
278static struct freq_attr _name = \
279__ATTR(_name, 0644, show_##_name, store_##_name)
280
281#define cpufreq_freq_attr_wo(_name) \
282static struct freq_attr _name = \
283__ATTR(_name, 0200, NULL, store_##_name)
284
285#define define_one_global_ro(_name) \
286static struct kobj_attribute _name = \
287__ATTR(_name, 0444, show_##_name, NULL)
288
289#define define_one_global_rw(_name) \
290static struct kobj_attribute _name = \
291__ATTR(_name, 0644, show_##_name, store_##_name)
292
293
294struct cpufreq_driver {
295 char name[CPUFREQ_NAME_LEN];
296 u8 flags;
297 void *driver_data;
298
299 /* needed by all drivers */
300 int (*init)(struct cpufreq_policy *policy);
301 int (*verify)(struct cpufreq_policy_data *policy);
302
303 /* define one out of two */
304 int (*setpolicy)(struct cpufreq_policy *policy);
305
306 /*
307 * On failure, should always restore frequency to policy->restore_freq
308 * (i.e. old freq).
309 */
310 int (*target)(struct cpufreq_policy *policy,
311 unsigned int target_freq,
312 unsigned int relation); /* Deprecated */
313 int (*target_index)(struct cpufreq_policy *policy,
314 unsigned int index);
315 unsigned int (*fast_switch)(struct cpufreq_policy *policy,
316 unsigned int target_freq);
317
318 /*
319 * Caches and returns the lowest driver-supported frequency greater than
320 * or equal to the target frequency, subject to any driver limitations.
321 * Does not set the frequency. Only to be implemented for drivers with
322 * target().
323 */
324 unsigned int (*resolve_freq)(struct cpufreq_policy *policy,
325 unsigned int target_freq);
326
327 /*
328 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
329 * unset.
330 *
331 * get_intermediate should return a stable intermediate frequency
332 * platform wants to switch to and target_intermediate() should set CPU
333 * to that frequency, before jumping to the frequency corresponding
334 * to 'index'. Core will take care of sending notifications and driver
335 * doesn't have to handle them in target_intermediate() or
336 * target_index().
337 *
338 * Drivers can return '0' from get_intermediate() in case they don't
339 * wish to switch to intermediate frequency for some target frequency.
340 * In that case core will directly call ->target_index().
341 */
342 unsigned int (*get_intermediate)(struct cpufreq_policy *policy,
343 unsigned int index);
344 int (*target_intermediate)(struct cpufreq_policy *policy,
345 unsigned int index);
346
347 /* should be defined, if possible */
348 unsigned int (*get)(unsigned int cpu);
349
350 /* Called to update policy limits on firmware notifications. */
351 void (*update_limits)(unsigned int cpu);
352
353 /* optional */
354 int (*bios_limit)(int cpu, unsigned int *limit);
355
356 int (*online)(struct cpufreq_policy *policy);
357 int (*offline)(struct cpufreq_policy *policy);
358 int (*exit)(struct cpufreq_policy *policy);
359 void (*stop_cpu)(struct cpufreq_policy *policy);
360 int (*suspend)(struct cpufreq_policy *policy);
361 int (*resume)(struct cpufreq_policy *policy);
362
363 /* Will be called after the driver is fully initialized */
364 void (*ready)(struct cpufreq_policy *policy);
365
366 struct freq_attr **attr;
367
368 /* platform specific boost support code */
369 bool boost_enabled;
370 int (*set_boost)(struct cpufreq_policy *policy, int state);
371};
372
373/* flags */
374
375/* driver isn't removed even if all ->init() calls failed */
376#define CPUFREQ_STICKY BIT(0)
377
378/* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
379#define CPUFREQ_CONST_LOOPS BIT(1)
380
381/* don't warn on suspend/resume speed mismatches */
382#define CPUFREQ_PM_NO_WARN BIT(2)
383
384/*
385 * This should be set by platforms having multiple clock-domains, i.e.
386 * supporting multiple policies. With this sysfs directories of governor would
387 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
388 * governor with different tunables for different clusters.
389 */
390#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY BIT(3)
391
392/*
393 * Driver will do POSTCHANGE notifications from outside of their ->target()
394 * routine and so must set cpufreq_driver->flags with this flag, so that core
395 * can handle them specially.
396 */
397#define CPUFREQ_ASYNC_NOTIFICATION BIT(4)
398
399/*
400 * Set by drivers which want cpufreq core to check if CPU is running at a
401 * frequency present in freq-table exposed by the driver. For these drivers if
402 * CPU is found running at an out of table freq, we will try to set it to a freq
403 * from the table. And if that fails, we will stop further boot process by
404 * issuing a BUG_ON().
405 */
406#define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
407
408/*
409 * Set by drivers to disallow use of governors with "dynamic_switching" flag
410 * set.
411 */
412#define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING BIT(6)
413
414/*
415 * Set by drivers that want the core to automatically register the cpufreq
416 * driver as a thermal cooling device.
417 */
418#define CPUFREQ_IS_COOLING_DEV BIT(7)
419
420int cpufreq_register_driver(struct cpufreq_driver *driver_data);
421int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
422
423const char *cpufreq_get_current_driver(void);
424void *cpufreq_get_driver_data(void);
425
426static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
427{
428 return IS_ENABLED(CONFIG_CPU_THERMAL) &&
429 (drv->flags & CPUFREQ_IS_COOLING_DEV);
430}
431
432static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
433 unsigned int min,
434 unsigned int max)
435{
436 if (policy->min < min)
437 policy->min = min;
438 if (policy->max < min)
439 policy->max = min;
440 if (policy->min > max)
441 policy->min = max;
442 if (policy->max > max)
443 policy->max = max;
444 if (policy->min > policy->max)
445 policy->min = policy->max;
446 return;
447}
448
449static inline void
450cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
451{
452 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
453 policy->cpuinfo.max_freq);
454}
455
456#ifdef CONFIG_CPU_FREQ
457void cpufreq_suspend(void);
458void cpufreq_resume(void);
459int cpufreq_generic_suspend(struct cpufreq_policy *policy);
460#else
461static inline void cpufreq_suspend(void) {}
462static inline void cpufreq_resume(void) {}
463#endif
464
465/*********************************************************************
466 * CPUFREQ NOTIFIER INTERFACE *
467 *********************************************************************/
468
469#define CPUFREQ_TRANSITION_NOTIFIER (0)
470#define CPUFREQ_POLICY_NOTIFIER (1)
471
472/* Transition notifiers */
473#define CPUFREQ_PRECHANGE (0)
474#define CPUFREQ_POSTCHANGE (1)
475
476/* Policy Notifiers */
477#define CPUFREQ_CREATE_POLICY (0)
478#define CPUFREQ_REMOVE_POLICY (1)
479
480#ifdef CONFIG_CPU_FREQ
481int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
482int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
483
484void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
485 struct cpufreq_freqs *freqs);
486void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
487 struct cpufreq_freqs *freqs, int transition_failed);
488
489#else /* CONFIG_CPU_FREQ */
490static inline int cpufreq_register_notifier(struct notifier_block *nb,
491 unsigned int list)
492{
493 return 0;
494}
495static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
496 unsigned int list)
497{
498 return 0;
499}
500#endif /* !CONFIG_CPU_FREQ */
501
502/**
503 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
504 * safe)
505 * @old: old value
506 * @div: divisor
507 * @mult: multiplier
508 *
509 *
510 * new = old * mult / div
511 */
512static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
513 u_int mult)
514{
515#if BITS_PER_LONG == 32
516 u64 result = ((u64) old) * ((u64) mult);
517 do_div(result, div);
518 return (unsigned long) result;
519
520#elif BITS_PER_LONG == 64
521 unsigned long result = old * ((u64) mult);
522 result /= div;
523 return result;
524#endif
525}
526
527/*********************************************************************
528 * CPUFREQ GOVERNORS *
529 *********************************************************************/
530
531#define CPUFREQ_POLICY_UNKNOWN (0)
532/*
533 * If (cpufreq_driver->target) exists, the ->governor decides what frequency
534 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
535 * two generic policies are available:
536 */
537#define CPUFREQ_POLICY_POWERSAVE (1)
538#define CPUFREQ_POLICY_PERFORMANCE (2)
539
540/*
541 * The polling frequency depends on the capability of the processor. Default
542 * polling frequency is 1000 times the transition latency of the processor. The
543 * ondemand governor will work on any processor with transition latency <= 10ms,
544 * using appropriate sampling rate.
545 */
546#define LATENCY_MULTIPLIER (1000)
547
548struct cpufreq_governor {
549 char name[CPUFREQ_NAME_LEN];
550 int (*init)(struct cpufreq_policy *policy);
551 void (*exit)(struct cpufreq_policy *policy);
552 int (*start)(struct cpufreq_policy *policy);
553 void (*stop)(struct cpufreq_policy *policy);
554 void (*limits)(struct cpufreq_policy *policy);
555 ssize_t (*show_setspeed) (struct cpufreq_policy *policy,
556 char *buf);
557 int (*store_setspeed) (struct cpufreq_policy *policy,
558 unsigned int freq);
559 /* For governors which change frequency dynamically by themselves */
560 bool dynamic_switching;
561 struct list_head governor_list;
562 struct module *owner;
563};
564
565/* Pass a target to the cpufreq driver */
566unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
567 unsigned int target_freq);
568int cpufreq_driver_target(struct cpufreq_policy *policy,
569 unsigned int target_freq,
570 unsigned int relation);
571int __cpufreq_driver_target(struct cpufreq_policy *policy,
572 unsigned int target_freq,
573 unsigned int relation);
574unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
575 unsigned int target_freq);
576unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
577int cpufreq_register_governor(struct cpufreq_governor *governor);
578void cpufreq_unregister_governor(struct cpufreq_governor *governor);
579int cpufreq_start_governor(struct cpufreq_policy *policy);
580void cpufreq_stop_governor(struct cpufreq_policy *policy);
581
582#define cpufreq_governor_init(__governor) \
583static int __init __governor##_init(void) \
584{ \
585 return cpufreq_register_governor(&__governor); \
586} \
587core_initcall(__governor##_init)
588
589#define cpufreq_governor_exit(__governor) \
590static void __exit __governor##_exit(void) \
591{ \
592 return cpufreq_unregister_governor(&__governor); \
593} \
594module_exit(__governor##_exit)
595
596struct cpufreq_governor *cpufreq_default_governor(void);
597struct cpufreq_governor *cpufreq_fallback_governor(void);
598
599static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
600{
601 if (policy->max < policy->cur)
602 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
603 else if (policy->min > policy->cur)
604 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
605}
606
607/* Governor attribute set */
608struct gov_attr_set {
609 struct kobject kobj;
610 struct list_head policy_list;
611 struct mutex update_lock;
612 int usage_count;
613};
614
615/* sysfs ops for cpufreq governors */
616extern const struct sysfs_ops governor_sysfs_ops;
617
618void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
619void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
620unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
621
622/* Governor sysfs attribute */
623struct governor_attr {
624 struct attribute attr;
625 ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
626 ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
627 size_t count);
628};
629
630/*********************************************************************
631 * FREQUENCY TABLE HELPERS *
632 *********************************************************************/
633
634/* Special Values of .frequency field */
635#define CPUFREQ_ENTRY_INVALID ~0u
636#define CPUFREQ_TABLE_END ~1u
637/* Special Values of .flags field */
638#define CPUFREQ_BOOST_FREQ (1 << 0)
639
640struct cpufreq_frequency_table {
641 unsigned int flags;
642 unsigned int driver_data; /* driver specific data, not used by core */
643 unsigned int frequency; /* kHz - doesn't need to be in ascending
644 * order */
645};
646
647#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
648int dev_pm_opp_init_cpufreq_table(struct device *dev,
649 struct cpufreq_frequency_table **table);
650void dev_pm_opp_free_cpufreq_table(struct device *dev,
651 struct cpufreq_frequency_table **table);
652#else
653static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
654 struct cpufreq_frequency_table
655 **table)
656{
657 return -EINVAL;
658}
659
660static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
661 struct cpufreq_frequency_table
662 **table)
663{
664}
665#endif
666
667/*
668 * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table
669 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
670 * @table: the cpufreq_frequency_table * to iterate over.
671 */
672
673#define cpufreq_for_each_entry(pos, table) \
674 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
675
676/*
677 * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
678 * with index
679 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
680 * @table: the cpufreq_frequency_table * to iterate over.
681 * @idx: the table entry currently being processed
682 */
683
684#define cpufreq_for_each_entry_idx(pos, table, idx) \
685 for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
686 pos++, idx++)
687
688/*
689 * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
690 * excluding CPUFREQ_ENTRY_INVALID frequencies.
691 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
692 * @table: the cpufreq_frequency_table * to iterate over.
693 */
694
695#define cpufreq_for_each_valid_entry(pos, table) \
696 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \
697 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
698 continue; \
699 else
700
701/*
702 * cpufreq_for_each_valid_entry_idx - iterate with index over a cpufreq
703 * frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
704 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
705 * @table: the cpufreq_frequency_table * to iterate over.
706 * @idx: the table entry currently being processed
707 */
708
709#define cpufreq_for_each_valid_entry_idx(pos, table, idx) \
710 cpufreq_for_each_entry_idx(pos, table, idx) \
711 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
712 continue; \
713 else
714
715
716int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
717 struct cpufreq_frequency_table *table);
718
719int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
720 struct cpufreq_frequency_table *table);
721int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
722
723int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
724 unsigned int target_freq,
725 unsigned int relation);
726int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
727 unsigned int freq);
728
729ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
730
731#ifdef CONFIG_CPU_FREQ
732int cpufreq_boost_trigger_state(int state);
733int cpufreq_boost_enabled(void);
734int cpufreq_enable_boost_support(void);
735bool policy_has_boost_freq(struct cpufreq_policy *policy);
736
737/* Find lowest freq at or above target in a table in ascending order */
738static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
739 unsigned int target_freq)
740{
741 struct cpufreq_frequency_table *table = policy->freq_table;
742 struct cpufreq_frequency_table *pos;
743 unsigned int freq;
744 int idx, best = -1;
745
746 cpufreq_for_each_valid_entry_idx(pos, table, idx) {
747 freq = pos->frequency;
748
749 if (freq >= target_freq)
750 return idx;
751
752 best = idx;
753 }
754
755 return best;
756}
757
758/* Find lowest freq at or above target in a table in descending order */
759static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
760 unsigned int target_freq)
761{
762 struct cpufreq_frequency_table *table = policy->freq_table;
763 struct cpufreq_frequency_table *pos;
764 unsigned int freq;
765 int idx, best = -1;
766
767 cpufreq_for_each_valid_entry_idx(pos, table, idx) {
768 freq = pos->frequency;
769
770 if (freq == target_freq)
771 return idx;
772
773 if (freq > target_freq) {
774 best = idx;
775 continue;
776 }
777
778 /* No freq found above target_freq */
779 if (best == -1)
780 return idx;
781
782 return best;
783 }
784
785 return best;
786}
787
788/* Works only on sorted freq-tables */
789static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
790 unsigned int target_freq)
791{
792 target_freq = clamp_val(target_freq, policy->min, policy->max);
793
794 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
795 return cpufreq_table_find_index_al(policy, target_freq);
796 else
797 return cpufreq_table_find_index_dl(policy, target_freq);
798}
799
800/* Find highest freq at or below target in a table in ascending order */
801static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
802 unsigned int target_freq)
803{
804 struct cpufreq_frequency_table *table = policy->freq_table;
805 struct cpufreq_frequency_table *pos;
806 unsigned int freq;
807 int idx, best = -1;
808
809 cpufreq_for_each_valid_entry_idx(pos, table, idx) {
810 freq = pos->frequency;
811
812 if (freq == target_freq)
813 return idx;
814
815 if (freq < target_freq) {
816 best = idx;
817 continue;
818 }
819
820 /* No freq found below target_freq */
821 if (best == -1)
822 return idx;
823
824 return best;
825 }
826
827 return best;
828}
829
830/* Find highest freq at or below target in a table in descending order */
831static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
832 unsigned int target_freq)
833{
834 struct cpufreq_frequency_table *table = policy->freq_table;
835 struct cpufreq_frequency_table *pos;
836 unsigned int freq;
837 int idx, best = -1;
838
839 cpufreq_for_each_valid_entry_idx(pos, table, idx) {
840 freq = pos->frequency;
841
842 if (freq <= target_freq)
843 return idx;
844
845 best = idx;
846 }
847
848 return best;
849}
850
851/* Works only on sorted freq-tables */
852static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
853 unsigned int target_freq)
854{
855 target_freq = clamp_val(target_freq, policy->min, policy->max);
856
857 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
858 return cpufreq_table_find_index_ah(policy, target_freq);
859 else
860 return cpufreq_table_find_index_dh(policy, target_freq);
861}
862
863/* Find closest freq to target in a table in ascending order */
864static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
865 unsigned int target_freq)
866{
867 struct cpufreq_frequency_table *table = policy->freq_table;
868 struct cpufreq_frequency_table *pos;
869 unsigned int freq;
870 int idx, best = -1;
871
872 cpufreq_for_each_valid_entry_idx(pos, table, idx) {
873 freq = pos->frequency;
874
875 if (freq == target_freq)
876 return idx;
877
878 if (freq < target_freq) {
879 best = idx;
880 continue;
881 }
882
883 /* No freq found below target_freq */
884 if (best == -1)
885 return idx;
886
887 /* Choose the closest freq */
888 if (target_freq - table[best].frequency > freq - target_freq)
889 return idx;
890
891 return best;
892 }
893
894 return best;
895}
896
897/* Find closest freq to target in a table in descending order */
898static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
899 unsigned int target_freq)
900{
901 struct cpufreq_frequency_table *table = policy->freq_table;
902 struct cpufreq_frequency_table *pos;
903 unsigned int freq;
904 int idx, best = -1;
905
906 cpufreq_for_each_valid_entry_idx(pos, table, idx) {
907 freq = pos->frequency;
908
909 if (freq == target_freq)
910 return idx;
911
912 if (freq > target_freq) {
913 best = idx;
914 continue;
915 }
916
917 /* No freq found above target_freq */
918 if (best == -1)
919 return idx;
920
921 /* Choose the closest freq */
922 if (table[best].frequency - target_freq > target_freq - freq)
923 return idx;
924
925 return best;
926 }
927
928 return best;
929}
930
931/* Works only on sorted freq-tables */
932static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
933 unsigned int target_freq)
934{
935 target_freq = clamp_val(target_freq, policy->min, policy->max);
936
937 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
938 return cpufreq_table_find_index_ac(policy, target_freq);
939 else
940 return cpufreq_table_find_index_dc(policy, target_freq);
941}
942
943static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
944 unsigned int target_freq,
945 unsigned int relation)
946{
947 if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
948 return cpufreq_table_index_unsorted(policy, target_freq,
949 relation);
950
951 switch (relation) {
952 case CPUFREQ_RELATION_L:
953 return cpufreq_table_find_index_l(policy, target_freq);
954 case CPUFREQ_RELATION_H:
955 return cpufreq_table_find_index_h(policy, target_freq);
956 case CPUFREQ_RELATION_C:
957 return cpufreq_table_find_index_c(policy, target_freq);
958 default:
959 WARN_ON_ONCE(1);
960 return 0;
961 }
962}
963
964static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
965{
966 struct cpufreq_frequency_table *pos;
967 int count = 0;
968
969 if (unlikely(!policy->freq_table))
970 return 0;
971
972 cpufreq_for_each_valid_entry(pos, policy->freq_table)
973 count++;
974
975 return count;
976}
977#else
978static inline int cpufreq_boost_trigger_state(int state)
979{
980 return 0;
981}
982static inline int cpufreq_boost_enabled(void)
983{
984 return 0;
985}
986
987static inline int cpufreq_enable_boost_support(void)
988{
989 return -EINVAL;
990}
991
992static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
993{
994 return false;
995}
996#endif
997
998#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
999void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1000 struct cpufreq_governor *old_gov);
1001#else
1002static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1003 struct cpufreq_governor *old_gov) { }
1004#endif
1005
1006extern void arch_freq_prepare_all(void);
1007extern unsigned int arch_freq_get_on_cpu(int cpu);
1008
1009extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
1010 unsigned long max_freq);
1011
1012/* the following are really really optional */
1013extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1014extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1015extern struct freq_attr *cpufreq_generic_attr[];
1016int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1017
1018unsigned int cpufreq_generic_get(unsigned int cpu);
1019void cpufreq_generic_init(struct cpufreq_policy *policy,
1020 struct cpufreq_frequency_table *table,
1021 unsigned int transition_latency);
1022#endif /* _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/mutex.h>
15#include <linux/notifier.h>
16#include <linux/threads.h>
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>
22#include <asm/div64.h>
23
24#define CPUFREQ_NAME_LEN 16
25
26
27/*********************************************************************
28 * CPUFREQ NOTIFIER INTERFACE *
29 *********************************************************************/
30
31#define CPUFREQ_TRANSITION_NOTIFIER (0)
32#define CPUFREQ_POLICY_NOTIFIER (1)
33
34#ifdef CONFIG_CPU_FREQ
35int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
36int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
37extern void disable_cpufreq(void);
38#else /* CONFIG_CPU_FREQ */
39static inline int cpufreq_register_notifier(struct notifier_block *nb,
40 unsigned int list)
41{
42 return 0;
43}
44static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
45 unsigned int list)
46{
47 return 0;
48}
49static inline void disable_cpufreq(void) { }
50#endif /* CONFIG_CPU_FREQ */
51
52/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
53 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
54 * two generic policies are available:
55 */
56
57#define CPUFREQ_POLICY_POWERSAVE (1)
58#define CPUFREQ_POLICY_PERFORMANCE (2)
59
60/* Frequency values here are CPU kHz so that hardware which doesn't run
61 * with some frequencies can complain without having to guess what per
62 * cent / per mille means.
63 * Maximum transition latency is in nanoseconds - if it's unknown,
64 * CPUFREQ_ETERNAL shall be used.
65 */
66
67struct cpufreq_governor;
68
69/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
70extern struct kobject *cpufreq_global_kobject;
71
72#define CPUFREQ_ETERNAL (-1)
73struct cpufreq_cpuinfo {
74 unsigned int max_freq;
75 unsigned int min_freq;
76
77 /* in 10^(-9) s = nanoseconds */
78 unsigned int transition_latency;
79};
80
81struct cpufreq_real_policy {
82 unsigned int min; /* in kHz */
83 unsigned int max; /* in kHz */
84 unsigned int policy; /* see above */
85 struct cpufreq_governor *governor; /* see below */
86};
87
88struct cpufreq_policy {
89 cpumask_var_t cpus; /* CPUs requiring sw coordination */
90 cpumask_var_t related_cpus; /* CPUs with any coordination */
91 unsigned int shared_type; /* ANY or ALL affected CPUs
92 should set cpufreq */
93 unsigned int cpu; /* cpu nr of registered CPU */
94 struct cpufreq_cpuinfo cpuinfo;/* see above */
95
96 unsigned int min; /* in kHz */
97 unsigned int max; /* in kHz */
98 unsigned int cur; /* in kHz, only needed if cpufreq
99 * governors are used */
100 unsigned int policy; /* see above */
101 struct cpufreq_governor *governor; /* see below */
102
103 struct work_struct update; /* if update_policy() needs to be
104 * called, but you're in IRQ context */
105
106 struct cpufreq_real_policy user_policy;
107
108 struct kobject kobj;
109 struct completion kobj_unregister;
110};
111
112#define CPUFREQ_ADJUST (0)
113#define CPUFREQ_INCOMPATIBLE (1)
114#define CPUFREQ_NOTIFY (2)
115#define CPUFREQ_START (3)
116
117#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
118#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
119#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
120#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
121
122/******************** cpufreq transition notifiers *******************/
123
124#define CPUFREQ_PRECHANGE (0)
125#define CPUFREQ_POSTCHANGE (1)
126#define CPUFREQ_RESUMECHANGE (8)
127#define CPUFREQ_SUSPENDCHANGE (9)
128
129struct cpufreq_freqs {
130 unsigned int cpu; /* cpu nr */
131 unsigned int old;
132 unsigned int new;
133 u8 flags; /* flags of cpufreq_driver, see below. */
134};
135
136
137/**
138 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
139 * @old: old value
140 * @div: divisor
141 * @mult: multiplier
142 *
143 *
144 * new = old * mult / div
145 */
146static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
147{
148#if BITS_PER_LONG == 32
149
150 u64 result = ((u64) old) * ((u64) mult);
151 do_div(result, div);
152 return (unsigned long) result;
153
154#elif BITS_PER_LONG == 64
155
156 unsigned long result = old * ((u64) mult);
157 result /= div;
158 return result;
159
160#endif
161};
162
163/*********************************************************************
164 * CPUFREQ GOVERNORS *
165 *********************************************************************/
166
167#define CPUFREQ_GOV_START 1
168#define CPUFREQ_GOV_STOP 2
169#define CPUFREQ_GOV_LIMITS 3
170
171struct cpufreq_governor {
172 char name[CPUFREQ_NAME_LEN];
173 int (*governor) (struct cpufreq_policy *policy,
174 unsigned int event);
175 ssize_t (*show_setspeed) (struct cpufreq_policy *policy,
176 char *buf);
177 int (*store_setspeed) (struct cpufreq_policy *policy,
178 unsigned int freq);
179 unsigned int max_transition_latency; /* HW must be able to switch to
180 next freq faster than this value in nano secs or we
181 will fallback to performance governor */
182 struct list_head governor_list;
183 struct module *owner;
184};
185
186/*
187 * Pass a target to the cpufreq driver.
188 */
189extern int cpufreq_driver_target(struct cpufreq_policy *policy,
190 unsigned int target_freq,
191 unsigned int relation);
192extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
193 unsigned int target_freq,
194 unsigned int relation);
195
196
197extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
198 unsigned int cpu);
199
200int cpufreq_register_governor(struct cpufreq_governor *governor);
201void cpufreq_unregister_governor(struct cpufreq_governor *governor);
202
203
204/*********************************************************************
205 * CPUFREQ DRIVER INTERFACE *
206 *********************************************************************/
207
208#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
209#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
210
211struct freq_attr;
212
213struct cpufreq_driver {
214 struct module *owner;
215 char name[CPUFREQ_NAME_LEN];
216 u8 flags;
217
218 /* needed by all drivers */
219 int (*init) (struct cpufreq_policy *policy);
220 int (*verify) (struct cpufreq_policy *policy);
221
222 /* define one out of two */
223 int (*setpolicy) (struct cpufreq_policy *policy);
224 int (*target) (struct cpufreq_policy *policy,
225 unsigned int target_freq,
226 unsigned int relation);
227
228 /* should be defined, if possible */
229 unsigned int (*get) (unsigned int cpu);
230
231 /* optional */
232 unsigned int (*getavg) (struct cpufreq_policy *policy,
233 unsigned int cpu);
234 int (*bios_limit) (int cpu, unsigned int *limit);
235
236 int (*exit) (struct cpufreq_policy *policy);
237 int (*suspend) (struct cpufreq_policy *policy);
238 int (*resume) (struct cpufreq_policy *policy);
239 struct freq_attr **attr;
240};
241
242/* flags */
243
244#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
245 * all ->init() calls failed */
246#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
247 * "constants" aren't affected by
248 * frequency transitions */
249#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
250 * mismatches */
251
252int cpufreq_register_driver(struct cpufreq_driver *driver_data);
253int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
254
255
256void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
257
258
259static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
260{
261 if (policy->min < min)
262 policy->min = min;
263 if (policy->max < min)
264 policy->max = min;
265 if (policy->min > max)
266 policy->min = max;
267 if (policy->max > max)
268 policy->max = max;
269 if (policy->min > policy->max)
270 policy->min = policy->max;
271 return;
272}
273
274struct freq_attr {
275 struct attribute attr;
276 ssize_t (*show)(struct cpufreq_policy *, char *);
277 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
278};
279
280#define cpufreq_freq_attr_ro(_name) \
281static struct freq_attr _name = \
282__ATTR(_name, 0444, show_##_name, NULL)
283
284#define cpufreq_freq_attr_ro_perm(_name, _perm) \
285static struct freq_attr _name = \
286__ATTR(_name, _perm, show_##_name, NULL)
287
288#define cpufreq_freq_attr_rw(_name) \
289static struct freq_attr _name = \
290__ATTR(_name, 0644, show_##_name, store_##_name)
291
292struct global_attr {
293 struct attribute attr;
294 ssize_t (*show)(struct kobject *kobj,
295 struct attribute *attr, char *buf);
296 ssize_t (*store)(struct kobject *a, struct attribute *b,
297 const char *c, size_t count);
298};
299
300#define define_one_global_ro(_name) \
301static struct global_attr _name = \
302__ATTR(_name, 0444, show_##_name, NULL)
303
304#define define_one_global_rw(_name) \
305static struct global_attr _name = \
306__ATTR(_name, 0644, show_##_name, store_##_name)
307
308
309/*********************************************************************
310 * CPUFREQ 2.6. INTERFACE *
311 *********************************************************************/
312int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
313int cpufreq_update_policy(unsigned int cpu);
314
315#ifdef CONFIG_CPU_FREQ
316/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
317unsigned int cpufreq_get(unsigned int cpu);
318#else
319static inline unsigned int cpufreq_get(unsigned int cpu)
320{
321 return 0;
322}
323#endif
324
325/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
326#ifdef CONFIG_CPU_FREQ
327unsigned int cpufreq_quick_get(unsigned int cpu);
328unsigned int cpufreq_quick_get_max(unsigned int cpu);
329#else
330static inline unsigned int cpufreq_quick_get(unsigned int cpu)
331{
332 return 0;
333}
334static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
335{
336 return 0;
337}
338#endif
339
340
341/*********************************************************************
342 * CPUFREQ DEFAULT GOVERNOR *
343 *********************************************************************/
344
345
346/*
347 Performance governor is fallback governor if any other gov failed to
348 auto load due latency restrictions
349*/
350#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
351extern struct cpufreq_governor cpufreq_gov_performance;
352#endif
353#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
354#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
355#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
356extern struct cpufreq_governor cpufreq_gov_powersave;
357#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
358#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
359extern struct cpufreq_governor cpufreq_gov_userspace;
360#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
361#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
362extern struct cpufreq_governor cpufreq_gov_ondemand;
363#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
364#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
365extern struct cpufreq_governor cpufreq_gov_conservative;
366#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
367#endif
368
369
370/*********************************************************************
371 * FREQUENCY TABLE HELPERS *
372 *********************************************************************/
373
374#define CPUFREQ_ENTRY_INVALID ~0
375#define CPUFREQ_TABLE_END ~1
376
377struct cpufreq_frequency_table {
378 unsigned int index; /* any */
379 unsigned int frequency; /* kHz - doesn't need to be in ascending
380 * order */
381};
382
383int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
384 struct cpufreq_frequency_table *table);
385
386int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
387 struct cpufreq_frequency_table *table);
388
389int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
390 struct cpufreq_frequency_table *table,
391 unsigned int target_freq,
392 unsigned int relation,
393 unsigned int *index);
394
395/* the following 3 funtions are for cpufreq core use only */
396struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
397struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
398void cpufreq_cpu_put(struct cpufreq_policy *data);
399
400/* the following are really really optional */
401extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
402
403void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
404 unsigned int cpu);
405
406void cpufreq_frequency_table_put_attr(unsigned int cpu);
407
408
409#endif /* _LINUX_CPUFREQ_H */