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
;
130 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
131 unsigned int cached_target_freq
;
132 int cached_resolved_idx
;
134 /* Synchronization for frequency transitions */
135 bool transition_ongoing
; /* Tracks transition status */
136 spinlock_t transition_lock
;
137 wait_queue_head_t transition_wait
;
138 struct task_struct
*transition_task
; /* Task which is doing the transition */
141 struct cpufreq_stats
*stats
;
143 /* For cpufreq driver's internal use */
148 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
149 #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
150 #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
151 #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
153 #ifdef CONFIG_CPU_FREQ
154 struct cpufreq_policy
*cpufreq_cpu_get_raw(unsigned int cpu
);
155 struct cpufreq_policy
*cpufreq_cpu_get(unsigned int cpu
);
156 void cpufreq_cpu_put(struct cpufreq_policy
*policy
);
158 static inline struct cpufreq_policy
*cpufreq_cpu_get_raw(unsigned int cpu
)
162 static inline struct cpufreq_policy
*cpufreq_cpu_get(unsigned int cpu
)
166 static inline void cpufreq_cpu_put(struct cpufreq_policy
*policy
) { }
169 static inline bool policy_is_shared(struct cpufreq_policy
*policy
)
171 return cpumask_weight(policy
->cpus
) > 1;
174 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
175 extern struct kobject
*cpufreq_global_kobject
;
177 #ifdef CONFIG_CPU_FREQ
178 unsigned int cpufreq_get(unsigned int cpu
);
179 unsigned int cpufreq_quick_get(unsigned int cpu
);
180 unsigned int cpufreq_quick_get_max(unsigned int cpu
);
181 void disable_cpufreq(void);
183 u64
get_cpu_idle_time(unsigned int cpu
, u64
*wall
, int io_busy
);
184 int cpufreq_get_policy(struct cpufreq_policy
*policy
, unsigned int cpu
);
185 void cpufreq_update_policy(unsigned int cpu
);
186 bool have_governor_per_policy(void);
187 struct kobject
*get_governor_parent_kobj(struct cpufreq_policy
*policy
);
188 void cpufreq_enable_fast_switch(struct cpufreq_policy
*policy
);
189 void cpufreq_disable_fast_switch(struct cpufreq_policy
*policy
);
191 static inline unsigned int cpufreq_get(unsigned int cpu
)
195 static inline unsigned int cpufreq_quick_get(unsigned int cpu
)
199 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu
)
203 static inline void disable_cpufreq(void) { }
206 #ifdef CONFIG_CPU_FREQ_STAT
207 void cpufreq_stats_create_table(struct cpufreq_policy
*policy
);
208 void cpufreq_stats_free_table(struct cpufreq_policy
*policy
);
209 void cpufreq_stats_record_transition(struct cpufreq_policy
*policy
,
210 unsigned int new_freq
);
212 static inline void cpufreq_stats_create_table(struct cpufreq_policy
*policy
) { }
213 static inline void cpufreq_stats_free_table(struct cpufreq_policy
*policy
) { }
214 static inline void cpufreq_stats_record_transition(struct cpufreq_policy
*policy
,
215 unsigned int new_freq
) { }
216 #endif /* CONFIG_CPU_FREQ_STAT */
218 /*********************************************************************
219 * CPUFREQ DRIVER INTERFACE *
220 *********************************************************************/
222 #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
223 #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
224 #define CPUFREQ_RELATION_C 2 /* closest frequency to target */
227 struct attribute attr
;
228 ssize_t (*show
)(struct cpufreq_policy
*, char *);
229 ssize_t (*store
)(struct cpufreq_policy
*, const char *, size_t count
);
232 #define cpufreq_freq_attr_ro(_name) \
233 static struct freq_attr _name = \
234 __ATTR(_name, 0444, show_##_name, NULL)
236 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
237 static struct freq_attr _name = \
238 __ATTR(_name, _perm, show_##_name, NULL)
240 #define cpufreq_freq_attr_rw(_name) \
241 static struct freq_attr _name = \
242 __ATTR(_name, 0644, show_##_name, store_##_name)
244 #define cpufreq_freq_attr_wo(_name) \
245 static struct freq_attr _name = \
246 __ATTR(_name, 0200, NULL, store_##_name)
249 struct attribute attr
;
250 ssize_t (*show
)(struct kobject
*kobj
,
251 struct attribute
*attr
, char *buf
);
252 ssize_t (*store
)(struct kobject
*a
, struct attribute
*b
,
253 const char *c
, size_t count
);
256 #define define_one_global_ro(_name) \
257 static struct global_attr _name = \
258 __ATTR(_name, 0444, show_##_name, NULL)
260 #define define_one_global_rw(_name) \
261 static struct global_attr _name = \
262 __ATTR(_name, 0644, show_##_name, store_##_name)
265 struct cpufreq_driver
{
266 char name
[CPUFREQ_NAME_LEN
];
270 /* needed by all drivers */
271 int (*init
)(struct cpufreq_policy
*policy
);
272 int (*verify
)(struct cpufreq_policy
*policy
);
274 /* define one out of two */
275 int (*setpolicy
)(struct cpufreq_policy
*policy
);
278 * On failure, should always restore frequency to policy->restore_freq
281 int (*target
)(struct cpufreq_policy
*policy
,
282 unsigned int target_freq
,
283 unsigned int relation
); /* Deprecated */
284 int (*target_index
)(struct cpufreq_policy
*policy
,
286 unsigned int (*fast_switch
)(struct cpufreq_policy
*policy
,
287 unsigned int target_freq
);
290 * Caches and returns the lowest driver-supported frequency greater than
291 * or equal to the target frequency, subject to any driver limitations.
292 * Does not set the frequency. Only to be implemented for drivers with
295 unsigned int (*resolve_freq
)(struct cpufreq_policy
*policy
,
296 unsigned int target_freq
);
299 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
302 * get_intermediate should return a stable intermediate frequency
303 * platform wants to switch to and target_intermediate() should set CPU
304 * to to that frequency, before jumping to the frequency corresponding
305 * to 'index'. Core will take care of sending notifications and driver
306 * doesn't have to handle them in target_intermediate() or
309 * Drivers can return '0' from get_intermediate() in case they don't
310 * wish to switch to intermediate frequency for some target frequency.
311 * In that case core will directly call ->target_index().
313 unsigned int (*get_intermediate
)(struct cpufreq_policy
*policy
,
315 int (*target_intermediate
)(struct cpufreq_policy
*policy
,
318 /* should be defined, if possible */
319 unsigned int (*get
)(unsigned int cpu
);
322 int (*bios_limit
)(int cpu
, unsigned int *limit
);
324 int (*exit
)(struct cpufreq_policy
*policy
);
325 void (*stop_cpu
)(struct cpufreq_policy
*policy
);
326 int (*suspend
)(struct cpufreq_policy
*policy
);
327 int (*resume
)(struct cpufreq_policy
*policy
);
329 /* Will be called after the driver is fully initialized */
330 void (*ready
)(struct cpufreq_policy
*policy
);
332 struct freq_attr
**attr
;
334 /* platform specific boost support code */
336 int (*set_boost
)(int state
);
340 #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if
341 all ->init() calls failed */
342 #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other
343 kernel "constants" aren't
344 affected by frequency
346 #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume
350 * This should be set by platforms having multiple clock-domains, i.e.
351 * supporting multiple policies. With this sysfs directories of governor would
352 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
353 * governor with different tunables for different clusters.
355 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
358 * Driver will do POSTCHANGE notifications from outside of their ->target()
359 * routine and so must set cpufreq_driver->flags with this flag, so that core
360 * can handle them specially.
362 #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4)
365 * Set by drivers which want cpufreq core to check if CPU is running at a
366 * frequency present in freq-table exposed by the driver. For these drivers if
367 * CPU is found running at an out of table freq, we will try to set it to a freq
368 * from the table. And if that fails, we will stop further boot process by
369 * issuing a BUG_ON().
371 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
373 int cpufreq_register_driver(struct cpufreq_driver
*driver_data
);
374 int cpufreq_unregister_driver(struct cpufreq_driver
*driver_data
);
376 const char *cpufreq_get_current_driver(void);
377 void *cpufreq_get_driver_data(void);
379 static inline void cpufreq_verify_within_limits(struct cpufreq_policy
*policy
,
380 unsigned int min
, unsigned int max
)
382 if (policy
->min
< min
)
384 if (policy
->max
< min
)
386 if (policy
->min
> max
)
388 if (policy
->max
> max
)
390 if (policy
->min
> policy
->max
)
391 policy
->min
= policy
->max
;
396 cpufreq_verify_within_cpu_limits(struct cpufreq_policy
*policy
)
398 cpufreq_verify_within_limits(policy
, policy
->cpuinfo
.min_freq
,
399 policy
->cpuinfo
.max_freq
);
402 #ifdef CONFIG_CPU_FREQ
403 void cpufreq_suspend(void);
404 void cpufreq_resume(void);
405 int cpufreq_generic_suspend(struct cpufreq_policy
*policy
);
407 static inline void cpufreq_suspend(void) {}
408 static inline void cpufreq_resume(void) {}
411 /*********************************************************************
412 * CPUFREQ NOTIFIER INTERFACE *
413 *********************************************************************/
415 #define CPUFREQ_TRANSITION_NOTIFIER (0)
416 #define CPUFREQ_POLICY_NOTIFIER (1)
418 /* Transition notifiers */
419 #define CPUFREQ_PRECHANGE (0)
420 #define CPUFREQ_POSTCHANGE (1)
422 /* Policy Notifiers */
423 #define CPUFREQ_ADJUST (0)
424 #define CPUFREQ_NOTIFY (1)
426 #ifdef CONFIG_CPU_FREQ
427 int cpufreq_register_notifier(struct notifier_block
*nb
, unsigned int list
);
428 int cpufreq_unregister_notifier(struct notifier_block
*nb
, unsigned int list
);
430 void cpufreq_freq_transition_begin(struct cpufreq_policy
*policy
,
431 struct cpufreq_freqs
*freqs
);
432 void cpufreq_freq_transition_end(struct cpufreq_policy
*policy
,
433 struct cpufreq_freqs
*freqs
, int transition_failed
);
435 #else /* CONFIG_CPU_FREQ */
436 static inline int cpufreq_register_notifier(struct notifier_block
*nb
,
441 static inline int cpufreq_unregister_notifier(struct notifier_block
*nb
,
446 #endif /* !CONFIG_CPU_FREQ */
449 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
456 * new = old * mult / div
458 static inline unsigned long cpufreq_scale(unsigned long old
, u_int div
,
461 #if BITS_PER_LONG == 32
462 u64 result
= ((u64
) old
) * ((u64
) mult
);
464 return (unsigned long) result
;
466 #elif BITS_PER_LONG == 64
467 unsigned long result
= old
* ((u64
) mult
);
473 /*********************************************************************
474 * CPUFREQ GOVERNORS *
475 *********************************************************************/
478 * If (cpufreq_driver->target) exists, the ->governor decides what frequency
479 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
480 * two generic policies are available:
482 #define CPUFREQ_POLICY_POWERSAVE (1)
483 #define CPUFREQ_POLICY_PERFORMANCE (2)
486 * The polling frequency depends on the capability of the processor. Default
487 * polling frequency is 1000 times the transition latency of the processor. The
488 * ondemand governor will work on any processor with transition latency <= 10ms,
489 * using appropriate sampling rate.
491 * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL)
492 * the ondemand governor will not work. All times here are in us (microseconds).
494 #define MIN_SAMPLING_RATE_RATIO (2)
495 #define LATENCY_MULTIPLIER (1000)
496 #define MIN_LATENCY_MULTIPLIER (20)
497 #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
499 struct cpufreq_governor
{
500 char name
[CPUFREQ_NAME_LEN
];
501 int (*init
)(struct cpufreq_policy
*policy
);
502 void (*exit
)(struct cpufreq_policy
*policy
);
503 int (*start
)(struct cpufreq_policy
*policy
);
504 void (*stop
)(struct cpufreq_policy
*policy
);
505 void (*limits
)(struct cpufreq_policy
*policy
);
506 ssize_t (*show_setspeed
) (struct cpufreq_policy
*policy
,
508 int (*store_setspeed
) (struct cpufreq_policy
*policy
,
510 unsigned int max_transition_latency
; /* HW must be able to switch to
511 next freq faster than this value in nano secs or we
512 will fallback to performance governor */
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 int cpufreq_register_governor(struct cpufreq_governor
*governor
);
529 void cpufreq_unregister_governor(struct cpufreq_governor
*governor
);
531 struct cpufreq_governor
*cpufreq_default_governor(void);
532 struct cpufreq_governor
*cpufreq_fallback_governor(void);
534 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy
*policy
)
536 if (policy
->max
< policy
->cur
)
537 __cpufreq_driver_target(policy
, policy
->max
, CPUFREQ_RELATION_H
);
538 else if (policy
->min
> policy
->cur
)
539 __cpufreq_driver_target(policy
, policy
->min
, CPUFREQ_RELATION_L
);
542 /* Governor attribute set */
543 struct gov_attr_set
{
545 struct list_head policy_list
;
546 struct mutex update_lock
;
550 /* sysfs ops for cpufreq governors */
551 extern const struct sysfs_ops governor_sysfs_ops
;
553 void gov_attr_set_init(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
554 void gov_attr_set_get(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
555 unsigned int gov_attr_set_put(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
557 /* Governor sysfs attribute */
558 struct governor_attr
{
559 struct attribute attr
;
560 ssize_t (*show
)(struct gov_attr_set
*attr_set
, char *buf
);
561 ssize_t (*store
)(struct gov_attr_set
*attr_set
, const char *buf
,
565 /*********************************************************************
566 * FREQUENCY TABLE HELPERS *
567 *********************************************************************/
569 /* Special Values of .frequency field */
570 #define CPUFREQ_ENTRY_INVALID ~0u
571 #define CPUFREQ_TABLE_END ~1u
572 /* Special Values of .flags field */
573 #define CPUFREQ_BOOST_FREQ (1 << 0)
575 struct cpufreq_frequency_table
{
577 unsigned int driver_data
; /* driver specific data, not used by core */
578 unsigned int frequency
; /* kHz - doesn't need to be in ascending
582 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
583 int dev_pm_opp_init_cpufreq_table(struct device
*dev
,
584 struct cpufreq_frequency_table
**table
);
585 void dev_pm_opp_free_cpufreq_table(struct device
*dev
,
586 struct cpufreq_frequency_table
**table
);
588 static inline int dev_pm_opp_init_cpufreq_table(struct device
*dev
,
589 struct cpufreq_frequency_table
595 static inline void dev_pm_opp_free_cpufreq_table(struct device
*dev
,
596 struct cpufreq_frequency_table
603 * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table
604 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
605 * @table: the cpufreq_frequency_table * to iterate over.
608 #define cpufreq_for_each_entry(pos, table) \
609 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
612 * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
613 * excluding CPUFREQ_ENTRY_INVALID frequencies.
614 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
615 * @table: the cpufreq_frequency_table * to iterate over.
618 #define cpufreq_for_each_valid_entry(pos, table) \
619 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \
620 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
624 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy
*policy
,
625 struct cpufreq_frequency_table
*table
);
627 int cpufreq_frequency_table_verify(struct cpufreq_policy
*policy
,
628 struct cpufreq_frequency_table
*table
);
629 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy
*policy
);
631 int cpufreq_table_index_unsorted(struct cpufreq_policy
*policy
,
632 unsigned int target_freq
,
633 unsigned int relation
);
634 int cpufreq_frequency_table_get_index(struct cpufreq_policy
*policy
,
637 ssize_t
cpufreq_show_cpus(const struct cpumask
*mask
, char *buf
);
639 #ifdef CONFIG_CPU_FREQ
640 int cpufreq_boost_trigger_state(int state
);
641 int cpufreq_boost_enabled(void);
642 int cpufreq_enable_boost_support(void);
643 bool policy_has_boost_freq(struct cpufreq_policy
*policy
);
645 /* Find lowest freq at or above target in a table in ascending order */
646 static inline int cpufreq_table_find_index_al(struct cpufreq_policy
*policy
,
647 unsigned int target_freq
)
649 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
650 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
653 cpufreq_for_each_valid_entry(pos
, table
) {
654 freq
= pos
->frequency
;
656 if (freq
>= target_freq
)
665 /* Find lowest freq at or above target in a table in descending order */
666 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy
*policy
,
667 unsigned int target_freq
)
669 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
670 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
673 cpufreq_for_each_valid_entry(pos
, table
) {
674 freq
= pos
->frequency
;
676 if (freq
== target_freq
)
679 if (freq
> target_freq
) {
684 /* No freq found above target_freq */
685 if (best
== table
- 1)
694 /* Works only on sorted freq-tables */
695 static inline int cpufreq_table_find_index_l(struct cpufreq_policy
*policy
,
696 unsigned int target_freq
)
698 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
700 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
701 return cpufreq_table_find_index_al(policy
, target_freq
);
703 return cpufreq_table_find_index_dl(policy
, target_freq
);
706 /* Find highest freq at or below target in a table in ascending order */
707 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy
*policy
,
708 unsigned int target_freq
)
710 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
711 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
714 cpufreq_for_each_valid_entry(pos
, table
) {
715 freq
= pos
->frequency
;
717 if (freq
== target_freq
)
720 if (freq
< target_freq
) {
725 /* No freq found below target_freq */
726 if (best
== table
- 1)
735 /* Find highest freq at or below target in a table in descending order */
736 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy
*policy
,
737 unsigned int target_freq
)
739 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
740 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
743 cpufreq_for_each_valid_entry(pos
, table
) {
744 freq
= pos
->frequency
;
746 if (freq
<= target_freq
)
755 /* Works only on sorted freq-tables */
756 static inline int cpufreq_table_find_index_h(struct cpufreq_policy
*policy
,
757 unsigned int target_freq
)
759 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
761 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
762 return cpufreq_table_find_index_ah(policy
, target_freq
);
764 return cpufreq_table_find_index_dh(policy
, target_freq
);
767 /* Find closest freq to target in a table in ascending order */
768 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy
*policy
,
769 unsigned int target_freq
)
771 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
772 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
775 cpufreq_for_each_valid_entry(pos
, table
) {
776 freq
= pos
->frequency
;
778 if (freq
== target_freq
)
781 if (freq
< target_freq
) {
786 /* No freq found below target_freq */
787 if (best
== table
- 1)
790 /* Choose the closest freq */
791 if (target_freq
- best
->frequency
> freq
- target_freq
)
800 /* Find closest freq to target in a table in descending order */
801 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy
*policy
,
802 unsigned int target_freq
)
804 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
805 struct cpufreq_frequency_table
*pos
, *best
= table
- 1;
808 cpufreq_for_each_valid_entry(pos
, table
) {
809 freq
= pos
->frequency
;
811 if (freq
== target_freq
)
814 if (freq
> target_freq
) {
819 /* No freq found above target_freq */
820 if (best
== table
- 1)
823 /* Choose the closest freq */
824 if (best
->frequency
- target_freq
> target_freq
- freq
)
833 /* Works only on sorted freq-tables */
834 static inline int cpufreq_table_find_index_c(struct cpufreq_policy
*policy
,
835 unsigned int target_freq
)
837 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
839 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
840 return cpufreq_table_find_index_ac(policy
, target_freq
);
842 return cpufreq_table_find_index_dc(policy
, target_freq
);
845 static inline int cpufreq_frequency_table_target(struct cpufreq_policy
*policy
,
846 unsigned int target_freq
,
847 unsigned int relation
)
849 if (unlikely(policy
->freq_table_sorted
== CPUFREQ_TABLE_UNSORTED
))
850 return cpufreq_table_index_unsorted(policy
, target_freq
,
854 case CPUFREQ_RELATION_L
:
855 return cpufreq_table_find_index_l(policy
, target_freq
);
856 case CPUFREQ_RELATION_H
:
857 return cpufreq_table_find_index_h(policy
, target_freq
);
858 case CPUFREQ_RELATION_C
:
859 return cpufreq_table_find_index_c(policy
, target_freq
);
861 pr_err("%s: Invalid relation: %d\n", __func__
, relation
);
866 static inline int cpufreq_boost_trigger_state(int state
)
870 static inline int cpufreq_boost_enabled(void)
875 static inline int cpufreq_enable_boost_support(void)
880 static inline bool policy_has_boost_freq(struct cpufreq_policy
*policy
)
886 /* the following are really really optional */
887 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs
;
888 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs
;
889 extern struct freq_attr
*cpufreq_generic_attr
[];
890 int cpufreq_table_validate_and_show(struct cpufreq_policy
*policy
,
891 struct cpufreq_frequency_table
*table
);
893 unsigned int cpufreq_generic_get(unsigned int cpu
);
894 int cpufreq_generic_init(struct cpufreq_policy
*policy
,
895 struct cpufreq_frequency_table
*table
,
896 unsigned int transition_latency
);
897 #endif /* _LINUX_CPUFREQ_H */