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1da177e4 | 1 | /* |
bb176f7d | 2 | * linux/include/linux/cpufreq.h |
1da177e4 | 3 | * |
bb176f7d VK |
4 | * Copyright (C) 2001 Russell King |
5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> | |
335dc333 | 6 | * |
1da177e4 LT |
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 | ||
652ed95d | 14 | #include <linux/clk.h> |
5ff0a268 VK |
15 | #include <linux/cpumask.h> |
16 | #include <linux/completion.h> | |
1da177e4 | 17 | #include <linux/kobject.h> |
5ff0a268 | 18 | #include <linux/notifier.h> |
12478cf0 | 19 | #include <linux/spinlock.h> |
1da177e4 | 20 | #include <linux/sysfs.h> |
1da177e4 | 21 | |
1da177e4 | 22 | /********************************************************************* |
74aca95d | 23 | * CPUFREQ INTERFACE * |
1da177e4 | 24 | *********************************************************************/ |
74aca95d VK |
25 | /* |
26 | * Frequency values here are CPU kHz | |
27 | * | |
b53cc6ea | 28 | * Maximum transition latency is in nanoseconds - if it's unknown, |
1da177e4 LT |
29 | * CPUFREQ_ETERNAL shall be used. |
30 | */ | |
31 | ||
74aca95d VK |
32 | #define CPUFREQ_ETERNAL (-1) |
33 | #define CPUFREQ_NAME_LEN 16 | |
34 | /* Print length for names. Extra 1 space for accomodating '\n' in prints */ | |
35 | #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1) | |
36 | ||
1da177e4 LT |
37 | struct cpufreq_governor; |
38 | ||
74aca95d VK |
39 | struct cpufreq_freqs { |
40 | unsigned int cpu; /* cpu nr */ | |
41 | unsigned int old; | |
42 | unsigned int new; | |
43 | u8 flags; /* flags of cpufreq_driver, see below. */ | |
44 | }; | |
8aa84ad8 | 45 | |
1da177e4 LT |
46 | struct cpufreq_cpuinfo { |
47 | unsigned int max_freq; | |
48 | unsigned int min_freq; | |
335dc333 TF |
49 | |
50 | /* in 10^(-9) s = nanoseconds */ | |
51 | unsigned int transition_latency; | |
1da177e4 LT |
52 | }; |
53 | ||
c7a7b418 | 54 | struct cpufreq_user_policy { |
1da177e4 LT |
55 | unsigned int min; /* in kHz */ |
56 | unsigned int max; /* in kHz */ | |
1da177e4 LT |
57 | }; |
58 | ||
59 | struct cpufreq_policy { | |
951fc5f4 VK |
60 | /* CPUs sharing clock, require sw coordination */ |
61 | cpumask_var_t cpus; /* Online CPUs only */ | |
62 | cpumask_var_t related_cpus; /* Online + Offline CPUs */ | |
559ed407 | 63 | cpumask_var_t real_cpus; /* Related and present */ |
951fc5f4 | 64 | |
62b36cc1 | 65 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
3b2d9942 | 66 | should set cpufreq */ |
9d16f207 | 67 | unsigned int cpu; /* cpu managing this policy, must be online */ |
9d16f207 | 68 | |
652ed95d | 69 | struct clk *clk; |
1da177e4 LT |
70 | struct cpufreq_cpuinfo cpuinfo;/* see above */ |
71 | ||
72 | unsigned int min; /* in kHz */ | |
73 | unsigned int max; /* in kHz */ | |
74 | unsigned int cur; /* in kHz, only needed if cpufreq | |
75 | * governors are used */ | |
1c03a2d0 | 76 | unsigned int restore_freq; /* = policy->cur before transition */ |
e28867ea VK |
77 | unsigned int suspend_freq; /* freq to set during suspend */ |
78 | ||
335dc333 | 79 | unsigned int policy; /* see above */ |
69030dd1 | 80 | unsigned int last_policy; /* policy before unplug */ |
1da177e4 | 81 | struct cpufreq_governor *governor; /* see below */ |
7bd353a9 | 82 | void *governor_data; |
4573237b | 83 | char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */ |
1da177e4 | 84 | |
1da177e4 LT |
85 | struct work_struct update; /* if update_policy() needs to be |
86 | * called, but you're in IRQ context */ | |
87 | ||
c7a7b418 | 88 | struct cpufreq_user_policy user_policy; |
e0b3165b | 89 | struct cpufreq_frequency_table *freq_table; |
1da177e4 | 90 | |
c88a1f8b | 91 | struct list_head policy_list; |
1da177e4 LT |
92 | struct kobject kobj; |
93 | struct completion kobj_unregister; | |
ad7722da | 94 | |
95 | /* | |
96 | * The rules for this semaphore: | |
97 | * - Any routine that wants to read from the policy structure will | |
98 | * do a down_read on this semaphore. | |
99 | * - Any routine that will write to the policy structure and/or may take away | |
100 | * the policy altogether (eg. CPU hotplug), will hold this lock in write | |
101 | * mode before doing so. | |
ad7722da | 102 | */ |
103 | struct rw_semaphore rwsem; | |
12478cf0 | 104 | |
b7898fda RW |
105 | /* |
106 | * Fast switch flags: | |
107 | * - fast_switch_possible should be set by the driver if it can | |
108 | * guarantee that frequency can be changed on any CPU sharing the | |
109 | * policy and that the change will affect all of the policy CPUs then. | |
110 | * - fast_switch_enabled is to be set by governors that support fast | |
111 | * freqnency switching with the help of cpufreq_enable_fast_switch(). | |
112 | */ | |
113 | bool fast_switch_possible; | |
114 | bool fast_switch_enabled; | |
115 | ||
12478cf0 SB |
116 | /* Synchronization for frequency transitions */ |
117 | bool transition_ongoing; /* Tracks transition status */ | |
118 | spinlock_t transition_lock; | |
119 | wait_queue_head_t transition_wait; | |
ca654dc3 | 120 | struct task_struct *transition_task; /* Task which is doing the transition */ |
413fffc3 | 121 | |
a9aaf291 VK |
122 | /* cpufreq-stats */ |
123 | struct cpufreq_stats *stats; | |
124 | ||
413fffc3 VK |
125 | /* For cpufreq driver's internal use */ |
126 | void *driver_data; | |
1da177e4 LT |
127 | }; |
128 | ||
62b36cc1 | 129 | /* Only for ACPI */ |
46f18e3a VP |
130 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
131 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ | |
132 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ | |
133 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ | |
1da177e4 | 134 | |
c75b505d | 135 | #ifdef CONFIG_CPU_FREQ |
1f0bd44e | 136 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); |
74aca95d | 137 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); |
3a3e9e06 | 138 | void cpufreq_cpu_put(struct cpufreq_policy *policy); |
c75b505d | 139 | #else |
1f0bd44e RW |
140 | static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
141 | { | |
142 | return NULL; | |
143 | } | |
c75b505d DV |
144 | static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
145 | { | |
146 | return NULL; | |
147 | } | |
148 | static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } | |
149 | #endif | |
74aca95d | 150 | |
2624f90c FB |
151 | static inline bool policy_is_shared(struct cpufreq_policy *policy) |
152 | { | |
153 | return cpumask_weight(policy->cpus) > 1; | |
154 | } | |
155 | ||
74aca95d VK |
156 | /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ |
157 | extern struct kobject *cpufreq_global_kobject; | |
1da177e4 | 158 | |
74aca95d VK |
159 | #ifdef CONFIG_CPU_FREQ |
160 | unsigned int cpufreq_get(unsigned int cpu); | |
161 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
162 | unsigned int cpufreq_quick_get_max(unsigned int cpu); | |
163 | void disable_cpufreq(void); | |
1da177e4 | 164 | |
74aca95d VK |
165 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); |
166 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); | |
167 | int cpufreq_update_policy(unsigned int cpu); | |
168 | bool have_governor_per_policy(void); | |
169 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); | |
b7898fda | 170 | void cpufreq_enable_fast_switch(struct cpufreq_policy *policy); |
6c9d9c81 | 171 | void cpufreq_disable_fast_switch(struct cpufreq_policy *policy); |
74aca95d VK |
172 | #else |
173 | static inline unsigned int cpufreq_get(unsigned int cpu) | |
1da177e4 | 174 | { |
74aca95d VK |
175 | return 0; |
176 | } | |
177 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
178 | { | |
179 | return 0; | |
180 | } | |
181 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) | |
182 | { | |
183 | return 0; | |
184 | } | |
185 | static inline void disable_cpufreq(void) { } | |
1da177e4 | 186 | #endif |
1da177e4 LT |
187 | |
188 | /********************************************************************* | |
74aca95d | 189 | * CPUFREQ DRIVER INTERFACE * |
1da177e4 LT |
190 | *********************************************************************/ |
191 | ||
74aca95d VK |
192 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ |
193 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ | |
5b0c0b16 | 194 | #define CPUFREQ_RELATION_C 2 /* closest frequency to target */ |
1da177e4 | 195 | |
74aca95d VK |
196 | struct freq_attr { |
197 | struct attribute attr; | |
198 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
199 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
1da177e4 LT |
200 | }; |
201 | ||
74aca95d VK |
202 | #define cpufreq_freq_attr_ro(_name) \ |
203 | static struct freq_attr _name = \ | |
204 | __ATTR(_name, 0444, show_##_name, NULL) | |
1da177e4 | 205 | |
74aca95d VK |
206 | #define cpufreq_freq_attr_ro_perm(_name, _perm) \ |
207 | static struct freq_attr _name = \ | |
208 | __ATTR(_name, _perm, show_##_name, NULL) | |
1da177e4 | 209 | |
74aca95d VK |
210 | #define cpufreq_freq_attr_rw(_name) \ |
211 | static struct freq_attr _name = \ | |
212 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
213 | ||
214 | struct global_attr { | |
215 | struct attribute attr; | |
216 | ssize_t (*show)(struct kobject *kobj, | |
217 | struct attribute *attr, char *buf); | |
218 | ssize_t (*store)(struct kobject *a, struct attribute *b, | |
219 | const char *c, size_t count); | |
220 | }; | |
221 | ||
222 | #define define_one_global_ro(_name) \ | |
223 | static struct global_attr _name = \ | |
224 | __ATTR(_name, 0444, show_##_name, NULL) | |
225 | ||
226 | #define define_one_global_rw(_name) \ | |
227 | static struct global_attr _name = \ | |
228 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
1da177e4 | 229 | |
1da177e4 LT |
230 | |
231 | struct cpufreq_driver { | |
90452e61 VK |
232 | char name[CPUFREQ_NAME_LEN]; |
233 | u8 flags; | |
234 | void *driver_data; | |
1da177e4 LT |
235 | |
236 | /* needed by all drivers */ | |
90452e61 VK |
237 | int (*init)(struct cpufreq_policy *policy); |
238 | int (*verify)(struct cpufreq_policy *policy); | |
1da177e4 LT |
239 | |
240 | /* define one out of two */ | |
90452e61 | 241 | int (*setpolicy)(struct cpufreq_policy *policy); |
1c03a2d0 VK |
242 | |
243 | /* | |
244 | * On failure, should always restore frequency to policy->restore_freq | |
245 | * (i.e. old freq). | |
246 | */ | |
90452e61 VK |
247 | int (*target)(struct cpufreq_policy *policy, |
248 | unsigned int target_freq, | |
249 | unsigned int relation); /* Deprecated */ | |
250 | int (*target_index)(struct cpufreq_policy *policy, | |
251 | unsigned int index); | |
b7898fda RW |
252 | unsigned int (*fast_switch)(struct cpufreq_policy *policy, |
253 | unsigned int target_freq); | |
1c03a2d0 VK |
254 | /* |
255 | * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION | |
256 | * unset. | |
257 | * | |
258 | * get_intermediate should return a stable intermediate frequency | |
259 | * platform wants to switch to and target_intermediate() should set CPU | |
260 | * to to that frequency, before jumping to the frequency corresponding | |
261 | * to 'index'. Core will take care of sending notifications and driver | |
262 | * doesn't have to handle them in target_intermediate() or | |
263 | * target_index(). | |
264 | * | |
265 | * Drivers can return '0' from get_intermediate() in case they don't | |
266 | * wish to switch to intermediate frequency for some target frequency. | |
267 | * In that case core will directly call ->target_index(). | |
268 | */ | |
90452e61 VK |
269 | unsigned int (*get_intermediate)(struct cpufreq_policy *policy, |
270 | unsigned int index); | |
271 | int (*target_intermediate)(struct cpufreq_policy *policy, | |
272 | unsigned int index); | |
1da177e4 LT |
273 | |
274 | /* should be defined, if possible */ | |
90452e61 | 275 | unsigned int (*get)(unsigned int cpu); |
1da177e4 LT |
276 | |
277 | /* optional */ | |
90452e61 | 278 | int (*bios_limit)(int cpu, unsigned int *limit); |
bf0b90e3 | 279 | |
90452e61 VK |
280 | int (*exit)(struct cpufreq_policy *policy); |
281 | void (*stop_cpu)(struct cpufreq_policy *policy); | |
282 | int (*suspend)(struct cpufreq_policy *policy); | |
283 | int (*resume)(struct cpufreq_policy *policy); | |
7c45cf31 VK |
284 | |
285 | /* Will be called after the driver is fully initialized */ | |
286 | void (*ready)(struct cpufreq_policy *policy); | |
287 | ||
90452e61 | 288 | struct freq_attr **attr; |
6f19efc0 LM |
289 | |
290 | /* platform specific boost support code */ | |
90452e61 VK |
291 | bool boost_enabled; |
292 | int (*set_boost)(int state); | |
1da177e4 LT |
293 | }; |
294 | ||
295 | /* flags */ | |
6461f018 VK |
296 | #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if |
297 | all ->init() calls failed */ | |
298 | #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other | |
299 | kernel "constants" aren't | |
300 | affected by frequency | |
301 | transitions */ | |
302 | #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume | |
303 | speed mismatches */ | |
1da177e4 | 304 | |
0b981e70 VK |
305 | /* |
306 | * This should be set by platforms having multiple clock-domains, i.e. | |
307 | * supporting multiple policies. With this sysfs directories of governor would | |
308 | * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same | |
309 | * governor with different tunables for different clusters. | |
310 | */ | |
311 | #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3) | |
312 | ||
7dbf694d VK |
313 | /* |
314 | * Driver will do POSTCHANGE notifications from outside of their ->target() | |
315 | * routine and so must set cpufreq_driver->flags with this flag, so that core | |
316 | * can handle them specially. | |
317 | */ | |
318 | #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4) | |
319 | ||
ae6b4271 VK |
320 | /* |
321 | * Set by drivers which want cpufreq core to check if CPU is running at a | |
322 | * frequency present in freq-table exposed by the driver. For these drivers if | |
323 | * CPU is found running at an out of table freq, we will try to set it to a freq | |
324 | * from the table. And if that fails, we will stop further boot process by | |
325 | * issuing a BUG_ON(). | |
326 | */ | |
327 | #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5) | |
328 | ||
221dee28 LT |
329 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
330 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
1da177e4 | 331 | |
74aca95d | 332 | const char *cpufreq_get_current_driver(void); |
51315cdf | 333 | void *cpufreq_get_driver_data(void); |
1da177e4 | 334 | |
bb176f7d VK |
335 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, |
336 | unsigned int min, unsigned int max) | |
1da177e4 LT |
337 | { |
338 | if (policy->min < min) | |
339 | policy->min = min; | |
340 | if (policy->max < min) | |
341 | policy->max = min; | |
342 | if (policy->min > max) | |
343 | policy->min = max; | |
344 | if (policy->max > max) | |
345 | policy->max = max; | |
346 | if (policy->min > policy->max) | |
347 | policy->min = policy->max; | |
348 | return; | |
349 | } | |
350 | ||
be49e346 VK |
351 | static inline void |
352 | cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) | |
353 | { | |
354 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, | |
355 | policy->cpuinfo.max_freq); | |
356 | } | |
357 | ||
2f0aea93 VK |
358 | #ifdef CONFIG_CPU_FREQ |
359 | void cpufreq_suspend(void); | |
360 | void cpufreq_resume(void); | |
e28867ea | 361 | int cpufreq_generic_suspend(struct cpufreq_policy *policy); |
2f0aea93 VK |
362 | #else |
363 | static inline void cpufreq_suspend(void) {} | |
364 | static inline void cpufreq_resume(void) {} | |
365 | #endif | |
366 | ||
74aca95d VK |
367 | /********************************************************************* |
368 | * CPUFREQ NOTIFIER INTERFACE * | |
369 | *********************************************************************/ | |
6dad2a29 | 370 | |
74aca95d VK |
371 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
372 | #define CPUFREQ_POLICY_NOTIFIER (1) | |
1da177e4 | 373 | |
74aca95d VK |
374 | /* Transition notifiers */ |
375 | #define CPUFREQ_PRECHANGE (0) | |
376 | #define CPUFREQ_POSTCHANGE (1) | |
6dad2a29 | 377 | |
74aca95d VK |
378 | /* Policy Notifiers */ |
379 | #define CPUFREQ_ADJUST (0) | |
6bfb7c74 VK |
380 | #define CPUFREQ_NOTIFY (1) |
381 | #define CPUFREQ_START (2) | |
382 | #define CPUFREQ_CREATE_POLICY (3) | |
383 | #define CPUFREQ_REMOVE_POLICY (4) | |
6dad2a29 | 384 | |
74aca95d VK |
385 | #ifdef CONFIG_CPU_FREQ |
386 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); | |
387 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); | |
6dad2a29 | 388 | |
12478cf0 SB |
389 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
390 | struct cpufreq_freqs *freqs); | |
391 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, | |
392 | struct cpufreq_freqs *freqs, int transition_failed); | |
1da177e4 | 393 | |
74aca95d VK |
394 | #else /* CONFIG_CPU_FREQ */ |
395 | static inline int cpufreq_register_notifier(struct notifier_block *nb, | |
396 | unsigned int list) | |
2eca40a8 RD |
397 | { |
398 | return 0; | |
399 | } | |
74aca95d VK |
400 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, |
401 | unsigned int list) | |
95235ca2 VP |
402 | { |
403 | return 0; | |
404 | } | |
74aca95d VK |
405 | #endif /* !CONFIG_CPU_FREQ */ |
406 | ||
407 | /** | |
408 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch | |
409 | * safe) | |
410 | * @old: old value | |
411 | * @div: divisor | |
412 | * @mult: multiplier | |
413 | * | |
414 | * | |
415 | * new = old * mult / div | |
416 | */ | |
417 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, | |
418 | u_int mult) | |
3d737108 | 419 | { |
74aca95d VK |
420 | #if BITS_PER_LONG == 32 |
421 | u64 result = ((u64) old) * ((u64) mult); | |
422 | do_div(result, div); | |
423 | return (unsigned long) result; | |
424 | ||
425 | #elif BITS_PER_LONG == 64 | |
426 | unsigned long result = old * ((u64) mult); | |
427 | result /= div; | |
428 | return result; | |
95235ca2 | 429 | #endif |
74aca95d | 430 | } |
95235ca2 | 431 | |
1da177e4 | 432 | /********************************************************************* |
74aca95d | 433 | * CPUFREQ GOVERNORS * |
1da177e4 LT |
434 | *********************************************************************/ |
435 | ||
74aca95d VK |
436 | /* |
437 | * If (cpufreq_driver->target) exists, the ->governor decides what frequency | |
438 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these | |
439 | * two generic policies are available: | |
440 | */ | |
441 | #define CPUFREQ_POLICY_POWERSAVE (1) | |
442 | #define CPUFREQ_POLICY_PERFORMANCE (2) | |
443 | ||
379480d8 RW |
444 | /* |
445 | * The polling frequency depends on the capability of the processor. Default | |
446 | * polling frequency is 1000 times the transition latency of the processor. The | |
447 | * ondemand governor will work on any processor with transition latency <= 10ms, | |
448 | * using appropriate sampling rate. | |
449 | * | |
450 | * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL) | |
451 | * the ondemand governor will not work. All times here are in us (microseconds). | |
452 | */ | |
453 | #define MIN_SAMPLING_RATE_RATIO (2) | |
454 | #define LATENCY_MULTIPLIER (1000) | |
455 | #define MIN_LATENCY_MULTIPLIER (20) | |
456 | #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) | |
457 | ||
74aca95d VK |
458 | /* Governor Events */ |
459 | #define CPUFREQ_GOV_START 1 | |
460 | #define CPUFREQ_GOV_STOP 2 | |
461 | #define CPUFREQ_GOV_LIMITS 3 | |
462 | #define CPUFREQ_GOV_POLICY_INIT 4 | |
463 | #define CPUFREQ_GOV_POLICY_EXIT 5 | |
464 | ||
465 | struct cpufreq_governor { | |
466 | char name[CPUFREQ_NAME_LEN]; | |
467 | int initialized; | |
468 | int (*governor) (struct cpufreq_policy *policy, | |
469 | unsigned int event); | |
470 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, | |
471 | char *buf); | |
472 | int (*store_setspeed) (struct cpufreq_policy *policy, | |
473 | unsigned int freq); | |
474 | unsigned int max_transition_latency; /* HW must be able to switch to | |
475 | next freq faster than this value in nano secs or we | |
476 | will fallback to performance governor */ | |
477 | struct list_head governor_list; | |
478 | struct module *owner; | |
479 | }; | |
480 | ||
481 | /* Pass a target to the cpufreq driver */ | |
b7898fda RW |
482 | unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, |
483 | unsigned int target_freq); | |
74aca95d VK |
484 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
485 | unsigned int target_freq, | |
486 | unsigned int relation); | |
487 | int __cpufreq_driver_target(struct cpufreq_policy *policy, | |
488 | unsigned int target_freq, | |
489 | unsigned int relation); | |
490 | int cpufreq_register_governor(struct cpufreq_governor *governor); | |
491 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
492 | ||
de1df26b RW |
493 | struct cpufreq_governor *cpufreq_default_governor(void); |
494 | struct cpufreq_governor *cpufreq_fallback_governor(void); | |
1da177e4 | 495 | |
66893b6a RW |
496 | /* Governor attribute set */ |
497 | struct gov_attr_set { | |
498 | struct kobject kobj; | |
499 | struct list_head policy_list; | |
500 | struct mutex update_lock; | |
501 | int usage_count; | |
502 | }; | |
503 | ||
504 | /* sysfs ops for cpufreq governors */ | |
505 | extern const struct sysfs_ops governor_sysfs_ops; | |
506 | ||
507 | void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node); | |
508 | void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node); | |
509 | unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node); | |
510 | ||
511 | /* Governor sysfs attribute */ | |
512 | struct governor_attr { | |
513 | struct attribute attr; | |
514 | ssize_t (*show)(struct gov_attr_set *attr_set, char *buf); | |
515 | ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf, | |
516 | size_t count); | |
517 | }; | |
518 | ||
1da177e4 LT |
519 | /********************************************************************* |
520 | * FREQUENCY TABLE HELPERS * | |
521 | *********************************************************************/ | |
522 | ||
7f4b0461 | 523 | /* Special Values of .frequency field */ |
2b1987a9 BH |
524 | #define CPUFREQ_ENTRY_INVALID ~0u |
525 | #define CPUFREQ_TABLE_END ~1u | |
7f4b0461 VK |
526 | /* Special Values of .flags field */ |
527 | #define CPUFREQ_BOOST_FREQ (1 << 0) | |
1da177e4 LT |
528 | |
529 | struct cpufreq_frequency_table { | |
7f4b0461 | 530 | unsigned int flags; |
50701588 | 531 | unsigned int driver_data; /* driver specific data, not used by core */ |
1da177e4 LT |
532 | unsigned int frequency; /* kHz - doesn't need to be in ascending |
533 | * order */ | |
534 | }; | |
535 | ||
a0dd7b79 NM |
536 | #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) |
537 | int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
538 | struct cpufreq_frequency_table **table); | |
539 | void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
540 | struct cpufreq_frequency_table **table); | |
541 | #else | |
542 | static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
543 | struct cpufreq_frequency_table | |
544 | **table) | |
545 | { | |
546 | return -EINVAL; | |
547 | } | |
548 | ||
549 | static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
550 | struct cpufreq_frequency_table | |
551 | **table) | |
552 | { | |
553 | } | |
554 | #endif | |
555 | ||
27e289dc SK |
556 | /* |
557 | * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table | |
558 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
559 | * @table: the cpufreq_frequency_table * to iterate over. | |
560 | */ | |
561 | ||
562 | #define cpufreq_for_each_entry(pos, table) \ | |
563 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) | |
564 | ||
565 | /* | |
566 | * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table | |
567 | * excluding CPUFREQ_ENTRY_INVALID frequencies. | |
568 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
569 | * @table: the cpufreq_frequency_table * to iterate over. | |
570 | */ | |
571 | ||
34b08705 RW |
572 | #define cpufreq_for_each_valid_entry(pos, table) \ |
573 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \ | |
574 | if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ | |
575 | continue; \ | |
576 | else | |
27e289dc | 577 | |
1da177e4 LT |
578 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, |
579 | struct cpufreq_frequency_table *table); | |
580 | ||
581 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
582 | struct cpufreq_frequency_table *table); | |
18434512 | 583 | int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy); |
1da177e4 LT |
584 | |
585 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
586 | struct cpufreq_frequency_table *table, | |
587 | unsigned int target_freq, | |
588 | unsigned int relation, | |
589 | unsigned int *index); | |
d3916691 VK |
590 | int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, |
591 | unsigned int freq); | |
1da177e4 | 592 | |
74aca95d VK |
593 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); |
594 | ||
6f19efc0 LM |
595 | #ifdef CONFIG_CPU_FREQ |
596 | int cpufreq_boost_trigger_state(int state); | |
6f19efc0 | 597 | int cpufreq_boost_enabled(void); |
44139ed4 VK |
598 | int cpufreq_enable_boost_support(void); |
599 | bool policy_has_boost_freq(struct cpufreq_policy *policy); | |
6f19efc0 LM |
600 | #else |
601 | static inline int cpufreq_boost_trigger_state(int state) | |
602 | { | |
603 | return 0; | |
604 | } | |
6f19efc0 LM |
605 | static inline int cpufreq_boost_enabled(void) |
606 | { | |
607 | return 0; | |
608 | } | |
44139ed4 VK |
609 | |
610 | static inline int cpufreq_enable_boost_support(void) | |
611 | { | |
612 | return -EINVAL; | |
613 | } | |
614 | ||
615 | static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) | |
616 | { | |
617 | return false; | |
618 | } | |
6f19efc0 | 619 | #endif |
74aca95d | 620 | /* the following funtion is for cpufreq core use only */ |
1da177e4 | 621 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); |
1da177e4 LT |
622 | |
623 | /* the following are really really optional */ | |
624 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
21c36d35 | 625 | extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; |
18434512 | 626 | extern struct freq_attr *cpufreq_generic_attr[]; |
27047a60 VK |
627 | int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, |
628 | struct cpufreq_frequency_table *table); | |
f4fd3797 | 629 | |
652ed95d | 630 | unsigned int cpufreq_generic_get(unsigned int cpu); |
70e9e778 VK |
631 | int cpufreq_generic_init(struct cpufreq_policy *policy, |
632 | struct cpufreq_frequency_table *table, | |
633 | unsigned int transition_latency); | |
1da177e4 | 634 | #endif /* _LINUX_CPUFREQ_H */ |