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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 | ||
54 | struct cpufreq_real_policy { | |
55 | unsigned int min; /* in kHz */ | |
56 | unsigned int max; /* in kHz */ | |
335dc333 | 57 | unsigned int policy; /* see above */ |
1da177e4 LT |
58 | struct cpufreq_governor *governor; /* see below */ |
59 | }; | |
60 | ||
61 | struct cpufreq_policy { | |
951fc5f4 VK |
62 | /* CPUs sharing clock, require sw coordination */ |
63 | cpumask_var_t cpus; /* Online CPUs only */ | |
64 | cpumask_var_t related_cpus; /* Online + Offline CPUs */ | |
65 | ||
62b36cc1 | 66 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
3b2d9942 | 67 | should set cpufreq */ |
b8eed8af VK |
68 | unsigned int cpu; /* cpu nr of CPU managing this policy */ |
69 | unsigned int last_cpu; /* cpu nr of previous CPU that managed | |
70 | * this policy */ | |
652ed95d | 71 | struct clk *clk; |
1da177e4 LT |
72 | struct cpufreq_cpuinfo cpuinfo;/* see above */ |
73 | ||
74 | unsigned int min; /* in kHz */ | |
75 | unsigned int max; /* in kHz */ | |
76 | unsigned int cur; /* in kHz, only needed if cpufreq | |
77 | * governors are used */ | |
1c03a2d0 | 78 | unsigned int restore_freq; /* = policy->cur before transition */ |
e28867ea VK |
79 | unsigned int suspend_freq; /* freq to set during suspend */ |
80 | ||
335dc333 | 81 | unsigned int policy; /* see above */ |
1da177e4 | 82 | struct cpufreq_governor *governor; /* see below */ |
7bd353a9 | 83 | void *governor_data; |
95731ebb | 84 | bool governor_enabled; /* governor start/stop flag */ |
1da177e4 | 85 | |
1da177e4 LT |
86 | struct work_struct update; /* if update_policy() needs to be |
87 | * called, but you're in IRQ context */ | |
88 | ||
89 | struct cpufreq_real_policy user_policy; | |
e0b3165b | 90 | struct cpufreq_frequency_table *freq_table; |
1da177e4 | 91 | |
c88a1f8b | 92 | struct list_head policy_list; |
1da177e4 LT |
93 | struct kobject kobj; |
94 | struct completion kobj_unregister; | |
ad7722da | 95 | |
96 | /* | |
97 | * The rules for this semaphore: | |
98 | * - Any routine that wants to read from the policy structure will | |
99 | * do a down_read on this semaphore. | |
100 | * - Any routine that will write to the policy structure and/or may take away | |
101 | * the policy altogether (eg. CPU hotplug), will hold this lock in write | |
102 | * mode before doing so. | |
103 | * | |
104 | * Additional rules: | |
105 | * - Lock should not be held across | |
106 | * __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT); | |
107 | */ | |
108 | struct rw_semaphore rwsem; | |
12478cf0 SB |
109 | |
110 | /* Synchronization for frequency transitions */ | |
111 | bool transition_ongoing; /* Tracks transition status */ | |
112 | spinlock_t transition_lock; | |
113 | wait_queue_head_t transition_wait; | |
ca654dc3 | 114 | struct task_struct *transition_task; /* Task which is doing the transition */ |
1da177e4 LT |
115 | }; |
116 | ||
62b36cc1 | 117 | /* Only for ACPI */ |
46f18e3a VP |
118 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
119 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ | |
120 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ | |
121 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ | |
1da177e4 | 122 | |
c75b505d | 123 | #ifdef CONFIG_CPU_FREQ |
74aca95d | 124 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); |
3a3e9e06 | 125 | void cpufreq_cpu_put(struct cpufreq_policy *policy); |
c75b505d DV |
126 | #else |
127 | static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) | |
128 | { | |
129 | return NULL; | |
130 | } | |
131 | static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } | |
132 | #endif | |
74aca95d | 133 | |
2624f90c FB |
134 | static inline bool policy_is_shared(struct cpufreq_policy *policy) |
135 | { | |
136 | return cpumask_weight(policy->cpus) > 1; | |
137 | } | |
138 | ||
74aca95d VK |
139 | /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ |
140 | extern struct kobject *cpufreq_global_kobject; | |
141 | int cpufreq_get_global_kobject(void); | |
142 | void cpufreq_put_global_kobject(void); | |
143 | int cpufreq_sysfs_create_file(const struct attribute *attr); | |
144 | void cpufreq_sysfs_remove_file(const struct attribute *attr); | |
1da177e4 | 145 | |
74aca95d VK |
146 | #ifdef CONFIG_CPU_FREQ |
147 | unsigned int cpufreq_get(unsigned int cpu); | |
148 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
149 | unsigned int cpufreq_quick_get_max(unsigned int cpu); | |
150 | void disable_cpufreq(void); | |
1da177e4 | 151 | |
74aca95d VK |
152 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); |
153 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); | |
154 | int cpufreq_update_policy(unsigned int cpu); | |
155 | bool have_governor_per_policy(void); | |
156 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); | |
157 | #else | |
158 | static inline unsigned int cpufreq_get(unsigned int cpu) | |
1da177e4 | 159 | { |
74aca95d VK |
160 | return 0; |
161 | } | |
162 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
163 | { | |
164 | return 0; | |
165 | } | |
166 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) | |
167 | { | |
168 | return 0; | |
169 | } | |
170 | static inline void disable_cpufreq(void) { } | |
1da177e4 | 171 | #endif |
1da177e4 LT |
172 | |
173 | /********************************************************************* | |
74aca95d | 174 | * CPUFREQ DRIVER INTERFACE * |
1da177e4 LT |
175 | *********************************************************************/ |
176 | ||
74aca95d VK |
177 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ |
178 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ | |
1da177e4 | 179 | |
74aca95d VK |
180 | struct freq_attr { |
181 | struct attribute attr; | |
182 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
183 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
1da177e4 LT |
184 | }; |
185 | ||
74aca95d VK |
186 | #define cpufreq_freq_attr_ro(_name) \ |
187 | static struct freq_attr _name = \ | |
188 | __ATTR(_name, 0444, show_##_name, NULL) | |
1da177e4 | 189 | |
74aca95d VK |
190 | #define cpufreq_freq_attr_ro_perm(_name, _perm) \ |
191 | static struct freq_attr _name = \ | |
192 | __ATTR(_name, _perm, show_##_name, NULL) | |
1da177e4 | 193 | |
74aca95d VK |
194 | #define cpufreq_freq_attr_rw(_name) \ |
195 | static struct freq_attr _name = \ | |
196 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
197 | ||
198 | struct global_attr { | |
199 | struct attribute attr; | |
200 | ssize_t (*show)(struct kobject *kobj, | |
201 | struct attribute *attr, char *buf); | |
202 | ssize_t (*store)(struct kobject *a, struct attribute *b, | |
203 | const char *c, size_t count); | |
204 | }; | |
205 | ||
206 | #define define_one_global_ro(_name) \ | |
207 | static struct global_attr _name = \ | |
208 | __ATTR(_name, 0444, show_##_name, NULL) | |
209 | ||
210 | #define define_one_global_rw(_name) \ | |
211 | static struct global_attr _name = \ | |
212 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
1da177e4 | 213 | |
1da177e4 LT |
214 | |
215 | struct cpufreq_driver { | |
1da177e4 LT |
216 | char name[CPUFREQ_NAME_LEN]; |
217 | u8 flags; | |
218 | ||
219 | /* needed by all drivers */ | |
220 | int (*init) (struct cpufreq_policy *policy); | |
221 | int (*verify) (struct cpufreq_policy *policy); | |
222 | ||
223 | /* define one out of two */ | |
224 | int (*setpolicy) (struct cpufreq_policy *policy); | |
1c03a2d0 VK |
225 | |
226 | /* | |
227 | * On failure, should always restore frequency to policy->restore_freq | |
228 | * (i.e. old freq). | |
229 | */ | |
9c0ebcf7 | 230 | int (*target) (struct cpufreq_policy *policy, /* Deprecated */ |
1da177e4 LT |
231 | unsigned int target_freq, |
232 | unsigned int relation); | |
9c0ebcf7 VK |
233 | int (*target_index) (struct cpufreq_policy *policy, |
234 | unsigned int index); | |
1c03a2d0 VK |
235 | /* |
236 | * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION | |
237 | * unset. | |
238 | * | |
239 | * get_intermediate should return a stable intermediate frequency | |
240 | * platform wants to switch to and target_intermediate() should set CPU | |
241 | * to to that frequency, before jumping to the frequency corresponding | |
242 | * to 'index'. Core will take care of sending notifications and driver | |
243 | * doesn't have to handle them in target_intermediate() or | |
244 | * target_index(). | |
245 | * | |
246 | * Drivers can return '0' from get_intermediate() in case they don't | |
247 | * wish to switch to intermediate frequency for some target frequency. | |
248 | * In that case core will directly call ->target_index(). | |
249 | */ | |
250 | unsigned int (*get_intermediate)(struct cpufreq_policy *policy, | |
251 | unsigned int index); | |
252 | int (*target_intermediate)(struct cpufreq_policy *policy, | |
253 | unsigned int index); | |
1da177e4 LT |
254 | |
255 | /* should be defined, if possible */ | |
256 | unsigned int (*get) (unsigned int cpu); | |
257 | ||
258 | /* optional */ | |
e2f74f35 | 259 | int (*bios_limit) (int cpu, unsigned int *limit); |
bf0b90e3 | 260 | |
1da177e4 | 261 | int (*exit) (struct cpufreq_policy *policy); |
367dc4aa | 262 | void (*stop_cpu) (struct cpufreq_policy *policy); |
7ca64e2d | 263 | int (*suspend) (struct cpufreq_policy *policy); |
1da177e4 LT |
264 | int (*resume) (struct cpufreq_policy *policy); |
265 | struct freq_attr **attr; | |
6f19efc0 LM |
266 | |
267 | /* platform specific boost support code */ | |
268 | bool boost_supported; | |
269 | bool boost_enabled; | |
270 | int (*set_boost) (int state); | |
1da177e4 LT |
271 | }; |
272 | ||
273 | /* flags */ | |
6461f018 VK |
274 | #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if |
275 | all ->init() calls failed */ | |
276 | #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other | |
277 | kernel "constants" aren't | |
278 | affected by frequency | |
279 | transitions */ | |
280 | #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume | |
281 | speed mismatches */ | |
1da177e4 | 282 | |
0b981e70 VK |
283 | /* |
284 | * This should be set by platforms having multiple clock-domains, i.e. | |
285 | * supporting multiple policies. With this sysfs directories of governor would | |
286 | * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same | |
287 | * governor with different tunables for different clusters. | |
288 | */ | |
289 | #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3) | |
290 | ||
7dbf694d VK |
291 | /* |
292 | * Driver will do POSTCHANGE notifications from outside of their ->target() | |
293 | * routine and so must set cpufreq_driver->flags with this flag, so that core | |
294 | * can handle them specially. | |
295 | */ | |
296 | #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4) | |
297 | ||
ae6b4271 VK |
298 | /* |
299 | * Set by drivers which want cpufreq core to check if CPU is running at a | |
300 | * frequency present in freq-table exposed by the driver. For these drivers if | |
301 | * CPU is found running at an out of table freq, we will try to set it to a freq | |
302 | * from the table. And if that fails, we will stop further boot process by | |
303 | * issuing a BUG_ON(). | |
304 | */ | |
305 | #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5) | |
306 | ||
221dee28 LT |
307 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
308 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
1da177e4 | 309 | |
74aca95d | 310 | const char *cpufreq_get_current_driver(void); |
1da177e4 | 311 | |
bb176f7d VK |
312 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, |
313 | unsigned int min, unsigned int max) | |
1da177e4 LT |
314 | { |
315 | if (policy->min < min) | |
316 | policy->min = min; | |
317 | if (policy->max < min) | |
318 | policy->max = min; | |
319 | if (policy->min > max) | |
320 | policy->min = max; | |
321 | if (policy->max > max) | |
322 | policy->max = max; | |
323 | if (policy->min > policy->max) | |
324 | policy->min = policy->max; | |
325 | return; | |
326 | } | |
327 | ||
be49e346 VK |
328 | static inline void |
329 | cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) | |
330 | { | |
331 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, | |
332 | policy->cpuinfo.max_freq); | |
333 | } | |
334 | ||
2f0aea93 VK |
335 | #ifdef CONFIG_CPU_FREQ |
336 | void cpufreq_suspend(void); | |
337 | void cpufreq_resume(void); | |
e28867ea | 338 | int cpufreq_generic_suspend(struct cpufreq_policy *policy); |
2f0aea93 VK |
339 | #else |
340 | static inline void cpufreq_suspend(void) {} | |
341 | static inline void cpufreq_resume(void) {} | |
342 | #endif | |
343 | ||
74aca95d VK |
344 | /********************************************************************* |
345 | * CPUFREQ NOTIFIER INTERFACE * | |
346 | *********************************************************************/ | |
6dad2a29 | 347 | |
74aca95d VK |
348 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
349 | #define CPUFREQ_POLICY_NOTIFIER (1) | |
1da177e4 | 350 | |
74aca95d VK |
351 | /* Transition notifiers */ |
352 | #define CPUFREQ_PRECHANGE (0) | |
353 | #define CPUFREQ_POSTCHANGE (1) | |
6dad2a29 | 354 | |
74aca95d VK |
355 | /* Policy Notifiers */ |
356 | #define CPUFREQ_ADJUST (0) | |
357 | #define CPUFREQ_INCOMPATIBLE (1) | |
358 | #define CPUFREQ_NOTIFY (2) | |
359 | #define CPUFREQ_START (3) | |
360 | #define CPUFREQ_UPDATE_POLICY_CPU (4) | |
fcd7af91 VK |
361 | #define CPUFREQ_CREATE_POLICY (5) |
362 | #define CPUFREQ_REMOVE_POLICY (6) | |
6dad2a29 | 363 | |
74aca95d VK |
364 | #ifdef CONFIG_CPU_FREQ |
365 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); | |
366 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); | |
6dad2a29 | 367 | |
12478cf0 SB |
368 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
369 | struct cpufreq_freqs *freqs); | |
370 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, | |
371 | struct cpufreq_freqs *freqs, int transition_failed); | |
1da177e4 | 372 | |
74aca95d VK |
373 | #else /* CONFIG_CPU_FREQ */ |
374 | static inline int cpufreq_register_notifier(struct notifier_block *nb, | |
375 | unsigned int list) | |
2eca40a8 RD |
376 | { |
377 | return 0; | |
378 | } | |
74aca95d VK |
379 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, |
380 | unsigned int list) | |
95235ca2 VP |
381 | { |
382 | return 0; | |
383 | } | |
74aca95d VK |
384 | #endif /* !CONFIG_CPU_FREQ */ |
385 | ||
386 | /** | |
387 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch | |
388 | * safe) | |
389 | * @old: old value | |
390 | * @div: divisor | |
391 | * @mult: multiplier | |
392 | * | |
393 | * | |
394 | * new = old * mult / div | |
395 | */ | |
396 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, | |
397 | u_int mult) | |
3d737108 | 398 | { |
74aca95d VK |
399 | #if BITS_PER_LONG == 32 |
400 | u64 result = ((u64) old) * ((u64) mult); | |
401 | do_div(result, div); | |
402 | return (unsigned long) result; | |
403 | ||
404 | #elif BITS_PER_LONG == 64 | |
405 | unsigned long result = old * ((u64) mult); | |
406 | result /= div; | |
407 | return result; | |
95235ca2 | 408 | #endif |
74aca95d | 409 | } |
95235ca2 | 410 | |
1da177e4 | 411 | /********************************************************************* |
74aca95d | 412 | * CPUFREQ GOVERNORS * |
1da177e4 LT |
413 | *********************************************************************/ |
414 | ||
74aca95d VK |
415 | /* |
416 | * If (cpufreq_driver->target) exists, the ->governor decides what frequency | |
417 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these | |
418 | * two generic policies are available: | |
419 | */ | |
420 | #define CPUFREQ_POLICY_POWERSAVE (1) | |
421 | #define CPUFREQ_POLICY_PERFORMANCE (2) | |
422 | ||
423 | /* Governor Events */ | |
424 | #define CPUFREQ_GOV_START 1 | |
425 | #define CPUFREQ_GOV_STOP 2 | |
426 | #define CPUFREQ_GOV_LIMITS 3 | |
427 | #define CPUFREQ_GOV_POLICY_INIT 4 | |
428 | #define CPUFREQ_GOV_POLICY_EXIT 5 | |
429 | ||
430 | struct cpufreq_governor { | |
431 | char name[CPUFREQ_NAME_LEN]; | |
432 | int initialized; | |
433 | int (*governor) (struct cpufreq_policy *policy, | |
434 | unsigned int event); | |
435 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, | |
436 | char *buf); | |
437 | int (*store_setspeed) (struct cpufreq_policy *policy, | |
438 | unsigned int freq); | |
439 | unsigned int max_transition_latency; /* HW must be able to switch to | |
440 | next freq faster than this value in nano secs or we | |
441 | will fallback to performance governor */ | |
442 | struct list_head governor_list; | |
443 | struct module *owner; | |
444 | }; | |
445 | ||
446 | /* Pass a target to the cpufreq driver */ | |
447 | int cpufreq_driver_target(struct cpufreq_policy *policy, | |
448 | unsigned int target_freq, | |
449 | unsigned int relation); | |
450 | int __cpufreq_driver_target(struct cpufreq_policy *policy, | |
451 | unsigned int target_freq, | |
452 | unsigned int relation); | |
453 | int cpufreq_register_governor(struct cpufreq_governor *governor); | |
454 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
455 | ||
456 | /* CPUFREQ DEFAULT GOVERNOR */ | |
1c256245 | 457 | /* |
bb176f7d VK |
458 | * Performance governor is fallback governor if any other gov failed to auto |
459 | * load due latency restrictions | |
460 | */ | |
6afde10c | 461 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
1da177e4 | 462 | extern struct cpufreq_governor cpufreq_gov_performance; |
6afde10c | 463 | #endif |
1c256245 TR |
464 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
465 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) | |
30d221db AG |
466 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE) |
467 | extern struct cpufreq_governor cpufreq_gov_powersave; | |
468 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave) | |
1da177e4 LT |
469 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) |
470 | extern struct cpufreq_governor cpufreq_gov_userspace; | |
1c256245 TR |
471 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace) |
472 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND) | |
473 | extern struct cpufreq_governor cpufreq_gov_ondemand; | |
474 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand) | |
475 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE) | |
476 | extern struct cpufreq_governor cpufreq_gov_conservative; | |
477 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative) | |
1da177e4 LT |
478 | #endif |
479 | ||
1da177e4 LT |
480 | /********************************************************************* |
481 | * FREQUENCY TABLE HELPERS * | |
482 | *********************************************************************/ | |
483 | ||
7f4b0461 | 484 | /* Special Values of .frequency field */ |
2b1987a9 BH |
485 | #define CPUFREQ_ENTRY_INVALID ~0u |
486 | #define CPUFREQ_TABLE_END ~1u | |
7f4b0461 VK |
487 | /* Special Values of .flags field */ |
488 | #define CPUFREQ_BOOST_FREQ (1 << 0) | |
1da177e4 LT |
489 | |
490 | struct cpufreq_frequency_table { | |
7f4b0461 | 491 | unsigned int flags; |
50701588 | 492 | unsigned int driver_data; /* driver specific data, not used by core */ |
1da177e4 LT |
493 | unsigned int frequency; /* kHz - doesn't need to be in ascending |
494 | * order */ | |
495 | }; | |
496 | ||
a0dd7b79 NM |
497 | #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) |
498 | int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
499 | struct cpufreq_frequency_table **table); | |
500 | void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
501 | struct cpufreq_frequency_table **table); | |
502 | #else | |
503 | static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
504 | struct cpufreq_frequency_table | |
505 | **table) | |
506 | { | |
507 | return -EINVAL; | |
508 | } | |
509 | ||
510 | static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
511 | struct cpufreq_frequency_table | |
512 | **table) | |
513 | { | |
514 | } | |
515 | #endif | |
516 | ||
5eeaf1f1 SK |
517 | static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos) |
518 | { | |
519 | while ((*pos)->frequency != CPUFREQ_TABLE_END) | |
520 | if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID) | |
521 | return true; | |
522 | else | |
523 | (*pos)++; | |
524 | return false; | |
525 | } | |
27e289dc SK |
526 | |
527 | /* | |
528 | * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table | |
529 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
530 | * @table: the cpufreq_frequency_table * to iterate over. | |
531 | */ | |
532 | ||
533 | #define cpufreq_for_each_entry(pos, table) \ | |
534 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) | |
535 | ||
536 | /* | |
537 | * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table | |
538 | * excluding CPUFREQ_ENTRY_INVALID frequencies. | |
539 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
540 | * @table: the cpufreq_frequency_table * to iterate over. | |
541 | */ | |
542 | ||
543 | #define cpufreq_for_each_valid_entry(pos, table) \ | |
544 | for (pos = table; cpufreq_next_valid(&pos); pos++) | |
545 | ||
1da177e4 LT |
546 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, |
547 | struct cpufreq_frequency_table *table); | |
548 | ||
549 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
550 | struct cpufreq_frequency_table *table); | |
18434512 | 551 | int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy); |
1da177e4 LT |
552 | |
553 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
554 | struct cpufreq_frequency_table *table, | |
555 | unsigned int target_freq, | |
556 | unsigned int relation, | |
557 | unsigned int *index); | |
d3916691 VK |
558 | int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, |
559 | unsigned int freq); | |
1da177e4 | 560 | |
74aca95d VK |
561 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); |
562 | ||
6f19efc0 LM |
563 | #ifdef CONFIG_CPU_FREQ |
564 | int cpufreq_boost_trigger_state(int state); | |
565 | int cpufreq_boost_supported(void); | |
566 | int cpufreq_boost_enabled(void); | |
567 | #else | |
568 | static inline int cpufreq_boost_trigger_state(int state) | |
569 | { | |
570 | return 0; | |
571 | } | |
572 | static inline int cpufreq_boost_supported(void) | |
573 | { | |
574 | return 0; | |
575 | } | |
576 | static inline int cpufreq_boost_enabled(void) | |
577 | { | |
578 | return 0; | |
579 | } | |
580 | #endif | |
74aca95d | 581 | /* the following funtion is for cpufreq core use only */ |
1da177e4 | 582 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); |
1da177e4 LT |
583 | |
584 | /* the following are really really optional */ | |
585 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
18434512 | 586 | extern struct freq_attr *cpufreq_generic_attr[]; |
27047a60 VK |
587 | int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, |
588 | struct cpufreq_frequency_table *table); | |
f4fd3797 | 589 | |
652ed95d | 590 | unsigned int cpufreq_generic_get(unsigned int cpu); |
70e9e778 VK |
591 | int cpufreq_generic_init(struct cpufreq_policy *policy, |
592 | struct cpufreq_frequency_table *table, | |
593 | unsigned int transition_latency); | |
1da177e4 | 594 | #endif /* _LINUX_CPUFREQ_H */ |