2 * linux/include/linux/cpufreq.h
4 * Copyright (C) 2001 Russell King
5 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
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.
11 #ifndef _LINUX_CPUFREQ_H
12 #define _LINUX_CPUFREQ_H
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>
22 /*********************************************************************
24 *********************************************************************/
26 * Frequency values here are CPU kHz
28 * Maximum transition latency is in nanoseconds - if it's unknown,
29 * CPUFREQ_ETERNAL shall be used.
32 #define CPUFREQ_ETERNAL (-1)
33 #define CPUFREQ_NAME_LEN 16
34 /* Print length for names. Extra 1 space for accommodating '\n' in prints */
35 #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
37 struct cpufreq_governor
;
39 enum cpufreq_table_sorting
{
40 CPUFREQ_TABLE_UNSORTED
,
41 CPUFREQ_TABLE_SORTED_ASCENDING
,
42 CPUFREQ_TABLE_SORTED_DESCENDING
45 struct cpufreq_freqs
{
46 unsigned int cpu
; /* cpu nr */
49 u8 flags
; /* flags of cpufreq_driver, see below. */
52 struct cpufreq_cpuinfo
{
53 unsigned int max_freq
;
54 unsigned int min_freq
;
56 /* in 10^(-9) s = nanoseconds */
57 unsigned int transition_latency
;
60 struct cpufreq_user_policy
{
61 unsigned int min
; /* in kHz */
62 unsigned int max
; /* in kHz */
65 struct cpufreq_policy
{
66 /* CPUs sharing clock, require sw coordination */
67 cpumask_var_t cpus
; /* Online CPUs only */
68 cpumask_var_t related_cpus
; /* Online + Offline CPUs */
69 cpumask_var_t real_cpus
; /* Related and present */
71 unsigned int shared_type
; /* ACPI: ANY or ALL affected CPUs
73 unsigned int cpu
; /* cpu managing this policy, must be online */
76 struct cpufreq_cpuinfo cpuinfo
;/* see above */
78 unsigned int min
; /* in kHz */
79 unsigned int max
; /* in kHz */
80 unsigned int cur
; /* in kHz, only needed if cpufreq
81 * governors are used */
82 unsigned int restore_freq
; /* = policy->cur before transition */
83 unsigned int suspend_freq
; /* freq to set during suspend */
85 unsigned int policy
; /* see above */
86 unsigned int last_policy
; /* policy before unplug */
87 struct cpufreq_governor
*governor
; /* see below */
89 char last_governor
[CPUFREQ_NAME_LEN
]; /* last governor used */
91 struct work_struct update
; /* if update_policy() needs to be
92 * called, but you're in IRQ context */
94 struct cpufreq_user_policy user_policy
;
95 struct cpufreq_frequency_table
*freq_table
;
96 enum cpufreq_table_sorting freq_table_sorted
;
98 struct list_head policy_list
;
100 struct completion kobj_unregister
;
103 * The rules for this semaphore:
104 * - Any routine that wants to read from the policy structure will
105 * do a down_read on this semaphore.
106 * - Any routine that will write to the policy structure and/or may take away
107 * the policy altogether (eg. CPU hotplug), will hold this lock in write
108 * mode before doing so.
110 struct rw_semaphore rwsem
;
114 * - fast_switch_possible should be set by the driver if it can
115 * guarantee that frequency can be changed on any CPU sharing the
116 * policy and that the change will affect all of the policy CPUs then.
117 * - fast_switch_enabled is to be set by governors that support fast
118 * frequency switching with the help of cpufreq_enable_fast_switch().
120 bool fast_switch_possible
;
121 bool fast_switch_enabled
;
124 * Preferred average time interval between consecutive invocations of
125 * the driver to set the frequency for this policy. To be set by the
126 * scaling driver (0, which is the default, means no preference).
128 unsigned int transition_delay_us
;
131 * Remote DVFS flag (Not added to the driver structure as we don't want
132 * to access another structure from scheduler hotpath).
134 * Should be set if CPUs can do DVFS on behalf of other CPUs from
135 * different cpufreq policies.
137 bool dvfs_possible_from_any_cpu
;
139 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
140 unsigned int cached_target_freq
;
141 int cached_resolved_idx
;
143 /* Synchronization for frequency transitions */
144 bool transition_ongoing
; /* Tracks transition status */
145 spinlock_t transition_lock
;
146 wait_queue_head_t transition_wait
;
147 struct task_struct
*transition_task
; /* Task which is doing the transition */
150 struct cpufreq_stats
*stats
;
152 /* For cpufreq driver's internal use */
157 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
158 #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
159 #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
160 #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
162 #ifdef CONFIG_CPU_FREQ
163 struct cpufreq_policy
*cpufreq_cpu_get_raw(unsigned int cpu
);
164 struct cpufreq_policy
*cpufreq_cpu_get(unsigned int cpu
);
165 void cpufreq_cpu_put(struct cpufreq_policy
*policy
);
167 static inline struct cpufreq_policy
*cpufreq_cpu_get_raw(unsigned int cpu
)
171 static inline struct cpufreq_policy
*cpufreq_cpu_get(unsigned int cpu
)
175 static inline void cpufreq_cpu_put(struct cpufreq_policy
*policy
) { }
178 static inline bool policy_is_shared(struct cpufreq_policy
*policy
)
180 return cpumask_weight(policy
->cpus
) > 1;
183 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
184 extern struct kobject
*cpufreq_global_kobject
;
186 #ifdef CONFIG_CPU_FREQ
187 unsigned int cpufreq_get(unsigned int cpu
);
188 unsigned int cpufreq_quick_get(unsigned int cpu
);
189 unsigned int cpufreq_quick_get_max(unsigned int cpu
);
190 void disable_cpufreq(void);
192 u64
get_cpu_idle_time(unsigned int cpu
, u64
*wall
, int io_busy
);
193 int cpufreq_get_policy(struct cpufreq_policy
*policy
, unsigned int cpu
);
194 void cpufreq_update_policy(unsigned int cpu
);
195 bool have_governor_per_policy(void);
196 struct kobject
*get_governor_parent_kobj(struct cpufreq_policy
*policy
);
197 void cpufreq_enable_fast_switch(struct cpufreq_policy
*policy
);
198 void cpufreq_disable_fast_switch(struct cpufreq_policy
*policy
);
200 static inline unsigned int cpufreq_get(unsigned int cpu
)
204 static inline unsigned int cpufreq_quick_get(unsigned int cpu
)
208 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu
)
212 static inline void disable_cpufreq(void) { }
215 #ifdef CONFIG_CPU_FREQ_STAT
216 void cpufreq_stats_create_table(struct cpufreq_policy
*policy
);
217 void cpufreq_stats_free_table(struct cpufreq_policy
*policy
);
218 void cpufreq_stats_record_transition(struct cpufreq_policy
*policy
,
219 unsigned int new_freq
);
221 static inline void cpufreq_stats_create_table(struct cpufreq_policy
*policy
) { }
222 static inline void cpufreq_stats_free_table(struct cpufreq_policy
*policy
) { }
223 static inline void cpufreq_stats_record_transition(struct cpufreq_policy
*policy
,
224 unsigned int new_freq
) { }
225 #endif /* CONFIG_CPU_FREQ_STAT */
227 /*********************************************************************
228 * CPUFREQ DRIVER INTERFACE *
229 *********************************************************************/
231 #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
232 #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
233 #define CPUFREQ_RELATION_C 2 /* closest frequency to target */
236 struct attribute attr
;
237 ssize_t (*show
)(struct cpufreq_policy
*, char *);
238 ssize_t (*store
)(struct cpufreq_policy
*, const char *, size_t count
);
241 #define cpufreq_freq_attr_ro(_name) \
242 static struct freq_attr _name = \
243 __ATTR(_name, 0444, show_##_name, NULL)
245 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
246 static struct freq_attr _name = \
247 __ATTR(_name, _perm, show_##_name, NULL)
249 #define cpufreq_freq_attr_rw(_name) \
250 static struct freq_attr _name = \
251 __ATTR(_name, 0644, show_##_name, store_##_name)
253 #define cpufreq_freq_attr_wo(_name) \
254 static struct freq_attr _name = \
255 __ATTR(_name, 0200, NULL, store_##_name)
257 #define define_one_global_ro(_name) \
258 static struct kobj_attribute _name = \
259 __ATTR(_name, 0444, show_##_name, NULL)
261 #define define_one_global_rw(_name) \
262 static struct kobj_attribute _name = \
263 __ATTR(_name, 0644, show_##_name, store_##_name)
266 struct cpufreq_driver
{
267 char name
[CPUFREQ_NAME_LEN
];
271 /* needed by all drivers */
272 int (*init
)(struct cpufreq_policy
*policy
);
273 int (*verify
)(struct cpufreq_policy
*policy
);
275 /* define one out of two */
276 int (*setpolicy
)(struct cpufreq_policy
*policy
);
279 * On failure, should always restore frequency to policy->restore_freq
282 int (*target
)(struct cpufreq_policy
*policy
,
283 unsigned int target_freq
,
284 unsigned int relation
); /* Deprecated */
285 int (*target_index
)(struct cpufreq_policy
*policy
,
287 unsigned int (*fast_switch
)(struct cpufreq_policy
*policy
,
288 unsigned int target_freq
);
291 * Caches and returns the lowest driver-supported frequency greater than
292 * or equal to the target frequency, subject to any driver limitations.
293 * Does not set the frequency. Only to be implemented for drivers with
296 unsigned int (*resolve_freq
)(struct cpufreq_policy
*policy
,
297 unsigned int target_freq
);
300 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
303 * get_intermediate should return a stable intermediate frequency
304 * platform wants to switch to and target_intermediate() should set CPU
305 * to to that frequency, before jumping to the frequency corresponding
306 * to 'index'. Core will take care of sending notifications and driver
307 * doesn't have to handle them in target_intermediate() or
310 * Drivers can return '0' from get_intermediate() in case they don't
311 * wish to switch to intermediate frequency for some target frequency.
312 * In that case core will directly call ->target_index().
314 unsigned int (*get_intermediate
)(struct cpufreq_policy
*policy
,
316 int (*target_intermediate
)(struct cpufreq_policy
*policy
,
319 /* should be defined, if possible */
320 unsigned int (*get
)(unsigned int cpu
);
323 int (*bios_limit
)(int cpu
, unsigned int *limit
);
325 int (*exit
)(struct cpufreq_policy
*policy
);
326 void (*stop_cpu
)(struct cpufreq_policy
*policy
);
327 int (*suspend
)(struct cpufreq_policy
*policy
);
328 int (*resume
)(struct cpufreq_policy
*policy
);
330 /* Will be called after the driver is fully initialized */
331 void (*ready
)(struct cpufreq_policy
*policy
);
333 struct freq_attr
**attr
;
335 /* platform specific boost support code */
337 int (*set_boost
)(int state
);
341 #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if
342 all ->init() calls failed */
343 #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other
344 kernel "constants" aren't
345 affected by frequency
347 #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume
351 * This should be set by platforms having multiple clock-domains, i.e.
352 * supporting multiple policies. With this sysfs directories of governor would
353 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
354 * governor with different tunables for different clusters.
356 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
359 * Driver will do POSTCHANGE notifications from outside of their ->target()
360 * routine and so must set cpufreq_driver->flags with this flag, so that core
361 * can handle them specially.
363 #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4)
366 * Set by drivers which want cpufreq core to check if CPU is running at a
367 * frequency present in freq-table exposed by the driver. For these drivers if
368 * CPU is found running at an out of table freq, we will try to set it to a freq
369 * from the table. And if that fails, we will stop further boot process by
370 * issuing a BUG_ON().
372 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
375 * Set by drivers to disallow use of governors with "dynamic_switching" flag
378 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING (1 << 6)
380 int cpufreq_register_driver(struct cpufreq_driver
*driver_data
);
381 int cpufreq_unregister_driver(struct cpufreq_driver
*driver_data
);
383 const char *cpufreq_get_current_driver(void);
384 void *cpufreq_get_driver_data(void);
386 static inline void cpufreq_verify_within_limits(struct cpufreq_policy
*policy
,
387 unsigned int min
, unsigned int max
)
389 if (policy
->min
< min
)
391 if (policy
->max
< min
)
393 if (policy
->min
> max
)
395 if (policy
->max
> max
)
397 if (policy
->min
> policy
->max
)
398 policy
->min
= policy
->max
;
403 cpufreq_verify_within_cpu_limits(struct cpufreq_policy
*policy
)
405 cpufreq_verify_within_limits(policy
, policy
->cpuinfo
.min_freq
,
406 policy
->cpuinfo
.max_freq
);
409 #ifdef CONFIG_CPU_FREQ
410 void cpufreq_suspend(void);
411 void cpufreq_resume(void);
412 int cpufreq_generic_suspend(struct cpufreq_policy
*policy
);
414 static inline void cpufreq_suspend(void) {}
415 static inline void cpufreq_resume(void) {}
418 /*********************************************************************
419 * CPUFREQ NOTIFIER INTERFACE *
420 *********************************************************************/
422 #define CPUFREQ_TRANSITION_NOTIFIER (0)
423 #define CPUFREQ_POLICY_NOTIFIER (1)
425 /* Transition notifiers */
426 #define CPUFREQ_PRECHANGE (0)
427 #define CPUFREQ_POSTCHANGE (1)
429 /* Policy Notifiers */
430 #define CPUFREQ_ADJUST (0)
431 #define CPUFREQ_NOTIFY (1)
433 #ifdef CONFIG_CPU_FREQ
434 int cpufreq_register_notifier(struct notifier_block
*nb
, unsigned int list
);
435 int cpufreq_unregister_notifier(struct notifier_block
*nb
, unsigned int list
);
437 void cpufreq_freq_transition_begin(struct cpufreq_policy
*policy
,
438 struct cpufreq_freqs
*freqs
);
439 void cpufreq_freq_transition_end(struct cpufreq_policy
*policy
,
440 struct cpufreq_freqs
*freqs
, int transition_failed
);
442 #else /* CONFIG_CPU_FREQ */
443 static inline int cpufreq_register_notifier(struct notifier_block
*nb
,
448 static inline int cpufreq_unregister_notifier(struct notifier_block
*nb
,
453 #endif /* !CONFIG_CPU_FREQ */
456 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
463 * new = old * mult / div
465 static inline unsigned long cpufreq_scale(unsigned long old
, u_int div
,
468 #if BITS_PER_LONG == 32
469 u64 result
= ((u64
) old
) * ((u64
) mult
);
471 return (unsigned long) result
;
473 #elif BITS_PER_LONG == 64
474 unsigned long result
= old
* ((u64
) mult
);
480 /*********************************************************************
481 * CPUFREQ GOVERNORS *
482 *********************************************************************/
485 * If (cpufreq_driver->target) exists, the ->governor decides what frequency
486 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
487 * two generic policies are available:
489 #define CPUFREQ_POLICY_POWERSAVE (1)
490 #define CPUFREQ_POLICY_PERFORMANCE (2)
493 * The polling frequency depends on the capability of the processor. Default
494 * polling frequency is 1000 times the transition latency of the processor. The
495 * ondemand governor will work on any processor with transition latency <= 10ms,
496 * using appropriate sampling rate.
498 #define LATENCY_MULTIPLIER (1000)
500 struct cpufreq_governor
{
501 char name
[CPUFREQ_NAME_LEN
];
502 int (*init
)(struct cpufreq_policy
*policy
);
503 void (*exit
)(struct cpufreq_policy
*policy
);
504 int (*start
)(struct cpufreq_policy
*policy
);
505 void (*stop
)(struct cpufreq_policy
*policy
);
506 void (*limits
)(struct cpufreq_policy
*policy
);
507 ssize_t (*show_setspeed
) (struct cpufreq_policy
*policy
,
509 int (*store_setspeed
) (struct cpufreq_policy
*policy
,
511 /* For governors which change frequency dynamically by themselves */
512 bool dynamic_switching
;
513 struct list_head governor_list
;
514 struct module
*owner
;
517 /* Pass a target to the cpufreq driver */
518 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy
*policy
,
519 unsigned int target_freq
);
520 int cpufreq_driver_target(struct cpufreq_policy
*policy
,
521 unsigned int target_freq
,
522 unsigned int relation
);
523 int __cpufreq_driver_target(struct cpufreq_policy
*policy
,
524 unsigned int target_freq
,
525 unsigned int relation
);
526 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy
*policy
,
527 unsigned int target_freq
);
528 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy
*policy
);
529 int cpufreq_register_governor(struct cpufreq_governor
*governor
);
530 void cpufreq_unregister_governor(struct cpufreq_governor
*governor
);
532 struct cpufreq_governor
*cpufreq_default_governor(void);
533 struct cpufreq_governor
*cpufreq_fallback_governor(void);
535 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy
*policy
)
537 if (policy
->max
< policy
->cur
)
538 __cpufreq_driver_target(policy
, policy
->max
, CPUFREQ_RELATION_H
);
539 else if (policy
->min
> policy
->cur
)
540 __cpufreq_driver_target(policy
, policy
->min
, CPUFREQ_RELATION_L
);
543 /* Governor attribute set */
544 struct gov_attr_set
{
546 struct list_head policy_list
;
547 struct mutex update_lock
;
551 /* sysfs ops for cpufreq governors */
552 extern const struct sysfs_ops governor_sysfs_ops
;
554 void gov_attr_set_init(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
555 void gov_attr_set_get(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
556 unsigned int gov_attr_set_put(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
558 /* Governor sysfs attribute */
559 struct governor_attr
{
560 struct attribute attr
;
561 ssize_t (*show
)(struct gov_attr_set
*attr_set
, char *buf
);
562 ssize_t (*store
)(struct gov_attr_set
*attr_set
, const char *buf
,
566 static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy
*policy
)
569 * Allow remote callbacks if:
570 * - dvfs_possible_from_any_cpu flag is set
571 * - the local and remote CPUs share cpufreq policy
573 return policy
->dvfs_possible_from_any_cpu
||
574 cpumask_test_cpu(smp_processor_id(), policy
->cpus
);
577 /*********************************************************************
578 * FREQUENCY TABLE HELPERS *
579 *********************************************************************/
581 /* Special Values of .frequency field */
582 #define CPUFREQ_ENTRY_INVALID ~0u
583 #define CPUFREQ_TABLE_END ~1u
584 /* Special Values of .flags field */
585 #define CPUFREQ_BOOST_FREQ (1 << 0)
587 struct cpufreq_frequency_table
{
589 unsigned int driver_data
; /* driver specific data, not used by core */
590 unsigned int frequency
; /* kHz - doesn't need to be in ascending
594 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
595 int dev_pm_opp_init_cpufreq_table(struct device
*dev
,
596 struct cpufreq_frequency_table
**table
);
597 void dev_pm_opp_free_cpufreq_table(struct device
*dev
,
598 struct cpufreq_frequency_table
**table
);
600 static inline int dev_pm_opp_init_cpufreq_table(struct device
*dev
,
601 struct cpufreq_frequency_table
607 static inline void dev_pm_opp_free_cpufreq_table(struct device
*dev
,
608 struct cpufreq_frequency_table
615 * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table
616 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
617 * @table: the cpufreq_frequency_table * to iterate over.
620 #define cpufreq_for_each_entry(pos, table) \
621 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
624 * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
625 * excluding CPUFREQ_ENTRY_INVALID frequencies.
626 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
627 * @table: the cpufreq_frequency_table * to iterate over.
630 #define cpufreq_for_each_valid_entry(pos, table) \
631 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \
632 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
636 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy
*policy
,
637 struct cpufreq_frequency_table
*table
);
639 int cpufreq_frequency_table_verify(struct cpufreq_policy
*policy
,
640 struct cpufreq_frequency_table
*table
);
641 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy
*policy
);
643 int cpufreq_table_index_unsorted(struct cpufreq_policy
*policy
,
644 unsigned int target_freq
,
645 unsigned int relation
);
646 int cpufreq_frequency_table_get_index(struct cpufreq_policy
*policy
,
649 ssize_t
cpufreq_show_cpus(const struct cpumask
*mask
, char *buf
);
651 #ifdef CONFIG_CPU_FREQ
652 int cpufreq_boost_trigger_state(int state
);
653 int cpufreq_boost_enabled(void);
654 int cpufreq_enable_boost_support(void);
655 bool policy_has_boost_freq(struct cpufreq_policy
*policy
);
657 /* Find lowest freq at or above target in a table in ascending order */
658 static inline int cpufreq_table_find_index_al(struct cpufreq_policy
*policy
,
659 unsigned int target_freq
)
661 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
662 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
665 cpufreq_for_each_valid_entry(pos
, table
) {
666 freq
= pos
->frequency
;
668 if (freq
>= target_freq
)
677 /* Find lowest freq at or above target in a table in descending order */
678 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy
*policy
,
679 unsigned int target_freq
)
681 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
682 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
685 cpufreq_for_each_valid_entry(pos
, table
) {
686 freq
= pos
->frequency
;
688 if (freq
== target_freq
)
691 if (freq
> target_freq
) {
696 /* No freq found above target_freq */
697 if (best
== table
- 1)
706 /* Works only on sorted freq-tables */
707 static inline int cpufreq_table_find_index_l(struct cpufreq_policy
*policy
,
708 unsigned int target_freq
)
710 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
712 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
713 return cpufreq_table_find_index_al(policy
, target_freq
);
715 return cpufreq_table_find_index_dl(policy
, target_freq
);
718 /* Find highest freq at or below target in a table in ascending order */
719 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy
*policy
,
720 unsigned int target_freq
)
722 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
723 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
726 cpufreq_for_each_valid_entry(pos
, table
) {
727 freq
= pos
->frequency
;
729 if (freq
== target_freq
)
732 if (freq
< target_freq
) {
737 /* No freq found below target_freq */
738 if (best
== table
- 1)
747 /* Find highest freq at or below target in a table in descending order */
748 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy
*policy
,
749 unsigned int target_freq
)
751 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
752 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
755 cpufreq_for_each_valid_entry(pos
, table
) {
756 freq
= pos
->frequency
;
758 if (freq
<= target_freq
)
767 /* Works only on sorted freq-tables */
768 static inline int cpufreq_table_find_index_h(struct cpufreq_policy
*policy
,
769 unsigned int target_freq
)
771 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
773 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
774 return cpufreq_table_find_index_ah(policy
, target_freq
);
776 return cpufreq_table_find_index_dh(policy
, target_freq
);
779 /* Find closest freq to target in a table in ascending order */
780 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy
*policy
,
781 unsigned int target_freq
)
783 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
784 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
787 cpufreq_for_each_valid_entry(pos
, table
) {
788 freq
= pos
->frequency
;
790 if (freq
== target_freq
)
793 if (freq
< target_freq
) {
798 /* No freq found below target_freq */
799 if (best
== table
- 1)
802 /* Choose the closest freq */
803 if (target_freq
- best
->frequency
> freq
- target_freq
)
812 /* Find closest freq to target in a table in descending order */
813 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy
*policy
,
814 unsigned int target_freq
)
816 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
817 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
820 cpufreq_for_each_valid_entry(pos
, table
) {
821 freq
= pos
->frequency
;
823 if (freq
== target_freq
)
826 if (freq
> target_freq
) {
831 /* No freq found above target_freq */
832 if (best
== table
- 1)
835 /* Choose the closest freq */
836 if (best
->frequency
- target_freq
> target_freq
- freq
)
845 /* Works only on sorted freq-tables */
846 static inline int cpufreq_table_find_index_c(struct cpufreq_policy
*policy
,
847 unsigned int target_freq
)
849 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
851 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
852 return cpufreq_table_find_index_ac(policy
, target_freq
);
854 return cpufreq_table_find_index_dc(policy
, target_freq
);
857 static inline int cpufreq_frequency_table_target(struct cpufreq_policy
*policy
,
858 unsigned int target_freq
,
859 unsigned int relation
)
861 if (unlikely(policy
->freq_table_sorted
== CPUFREQ_TABLE_UNSORTED
))
862 return cpufreq_table_index_unsorted(policy
, target_freq
,
866 case CPUFREQ_RELATION_L
:
867 return cpufreq_table_find_index_l(policy
, target_freq
);
868 case CPUFREQ_RELATION_H
:
869 return cpufreq_table_find_index_h(policy
, target_freq
);
870 case CPUFREQ_RELATION_C
:
871 return cpufreq_table_find_index_c(policy
, target_freq
);
873 pr_err("%s: Invalid relation: %d\n", __func__
, relation
);
878 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy
*policy
)
880 struct cpufreq_frequency_table
*pos
;
883 if (unlikely(!policy
->freq_table
))
886 cpufreq_for_each_valid_entry(pos
, policy
->freq_table
)
892 static inline int cpufreq_boost_trigger_state(int state
)
896 static inline int cpufreq_boost_enabled(void)
901 static inline int cpufreq_enable_boost_support(void)
906 static inline bool policy_has_boost_freq(struct cpufreq_policy
*policy
)
912 extern void arch_freq_prepare_all(void);
913 extern unsigned int arch_freq_get_on_cpu(int cpu
);
915 extern void arch_set_freq_scale(struct cpumask
*cpus
, unsigned long cur_freq
,
916 unsigned long max_freq
);
918 /* the following are really really optional */
919 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs
;
920 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs
;
921 extern struct freq_attr
*cpufreq_generic_attr
[];
922 int cpufreq_table_validate_and_show(struct cpufreq_policy
*policy
,
923 struct cpufreq_frequency_table
*table
);
925 unsigned int cpufreq_generic_get(unsigned int cpu
);
926 int cpufreq_generic_init(struct cpufreq_policy
*policy
,
927 struct cpufreq_frequency_table
*table
,
928 unsigned int transition_latency
);
929 #endif /* _LINUX_CPUFREQ_H */