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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/cpufreq.h | |
3 | * | |
4 | * Copyright (C) 2001 Russell King | |
5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> | |
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 | ||
83933af4 | 14 | #include <linux/mutex.h> |
1da177e4 LT |
15 | #include <linux/notifier.h> |
16 | #include <linux/threads.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/kobject.h> | |
19 | #include <linux/sysfs.h> | |
20 | #include <linux/completion.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/cpumask.h> | |
4e57b681 | 23 | #include <asm/div64.h> |
1da177e4 LT |
24 | |
25 | #define CPUFREQ_NAME_LEN 16 | |
26 | ||
27 | ||
28 | /********************************************************************* | |
29 | * CPUFREQ NOTIFIER INTERFACE * | |
30 | *********************************************************************/ | |
31 | ||
1da177e4 LT |
32 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
33 | #define CPUFREQ_POLICY_NOTIFIER (1) | |
34 | ||
6070b5de SS |
35 | #ifdef CONFIG_CPU_FREQ |
36 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); | |
37 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); | |
38 | #else /* CONFIG_CPU_FREQ */ | |
39 | static inline int cpufreq_register_notifier(struct notifier_block *nb, | |
40 | unsigned int list) | |
41 | { | |
42 | return 0; | |
43 | } | |
44 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, | |
45 | unsigned int list) | |
46 | { | |
47 | return 0; | |
48 | } | |
49 | #endif /* CONFIG_CPU_FREQ */ | |
1da177e4 LT |
50 | |
51 | /* if (cpufreq_driver->target) exists, the ->governor decides what frequency | |
52 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these | |
53 | * two generic policies are available: | |
54 | */ | |
55 | ||
56 | #define CPUFREQ_POLICY_POWERSAVE (1) | |
57 | #define CPUFREQ_POLICY_PERFORMANCE (2) | |
58 | ||
59 | /* Frequency values here are CPU kHz so that hardware which doesn't run | |
60 | * with some frequencies can complain without having to guess what per | |
61 | * cent / per mille means. | |
b53cc6ea | 62 | * Maximum transition latency is in nanoseconds - if it's unknown, |
1da177e4 LT |
63 | * CPUFREQ_ETERNAL shall be used. |
64 | */ | |
65 | ||
66 | struct cpufreq_governor; | |
67 | ||
68 | #define CPUFREQ_ETERNAL (-1) | |
69 | struct cpufreq_cpuinfo { | |
70 | unsigned int max_freq; | |
71 | unsigned int min_freq; | |
72 | unsigned int transition_latency; /* in 10^(-9) s = nanoseconds */ | |
73 | }; | |
74 | ||
75 | struct cpufreq_real_policy { | |
76 | unsigned int min; /* in kHz */ | |
77 | unsigned int max; /* in kHz */ | |
78 | unsigned int policy; /* see above */ | |
79 | struct cpufreq_governor *governor; /* see below */ | |
80 | }; | |
81 | ||
82 | struct cpufreq_policy { | |
e8628dd0 DW |
83 | cpumask_t cpus; /* CPUs requiring sw coordination */ |
84 | cpumask_t related_cpus; /* CPUs with any coordination */ | |
3b2d9942 VP |
85 | unsigned int shared_type; /* ANY or ALL affected CPUs |
86 | should set cpufreq */ | |
1da177e4 LT |
87 | unsigned int cpu; /* cpu nr of registered CPU */ |
88 | struct cpufreq_cpuinfo cpuinfo;/* see above */ | |
89 | ||
90 | unsigned int min; /* in kHz */ | |
91 | unsigned int max; /* in kHz */ | |
92 | unsigned int cur; /* in kHz, only needed if cpufreq | |
93 | * governors are used */ | |
94 | unsigned int policy; /* see above */ | |
95 | struct cpufreq_governor *governor; /* see below */ | |
96 | ||
1da177e4 LT |
97 | struct work_struct update; /* if update_policy() needs to be |
98 | * called, but you're in IRQ context */ | |
99 | ||
100 | struct cpufreq_real_policy user_policy; | |
101 | ||
102 | struct kobject kobj; | |
103 | struct completion kobj_unregister; | |
104 | }; | |
105 | ||
106 | #define CPUFREQ_ADJUST (0) | |
107 | #define CPUFREQ_INCOMPATIBLE (1) | |
108 | #define CPUFREQ_NOTIFY (2) | |
a1531acd | 109 | #define CPUFREQ_START (3) |
1da177e4 | 110 | |
46f18e3a VP |
111 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
112 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ | |
113 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ | |
114 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ | |
1da177e4 LT |
115 | |
116 | /******************** cpufreq transition notifiers *******************/ | |
117 | ||
118 | #define CPUFREQ_PRECHANGE (0) | |
119 | #define CPUFREQ_POSTCHANGE (1) | |
120 | #define CPUFREQ_RESUMECHANGE (8) | |
42d4dc3f | 121 | #define CPUFREQ_SUSPENDCHANGE (9) |
1da177e4 LT |
122 | |
123 | struct cpufreq_freqs { | |
124 | unsigned int cpu; /* cpu nr */ | |
125 | unsigned int old; | |
126 | unsigned int new; | |
127 | u8 flags; /* flags of cpufreq_driver, see below. */ | |
128 | }; | |
129 | ||
130 | ||
131 | /** | |
132 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe) | |
133 | * @old: old value | |
134 | * @div: divisor | |
135 | * @mult: multiplier | |
136 | * | |
137 | * | |
138 | * new = old * mult / div | |
139 | */ | |
140 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult) | |
141 | { | |
142 | #if BITS_PER_LONG == 32 | |
143 | ||
144 | u64 result = ((u64) old) * ((u64) mult); | |
145 | do_div(result, div); | |
146 | return (unsigned long) result; | |
147 | ||
148 | #elif BITS_PER_LONG == 64 | |
149 | ||
150 | unsigned long result = old * ((u64) mult); | |
151 | result /= div; | |
152 | return result; | |
153 | ||
154 | #endif | |
155 | }; | |
156 | ||
157 | /********************************************************************* | |
158 | * CPUFREQ GOVERNORS * | |
159 | *********************************************************************/ | |
160 | ||
161 | #define CPUFREQ_GOV_START 1 | |
162 | #define CPUFREQ_GOV_STOP 2 | |
163 | #define CPUFREQ_GOV_LIMITS 3 | |
164 | ||
165 | struct cpufreq_governor { | |
166 | char name[CPUFREQ_NAME_LEN]; | |
167 | int (*governor) (struct cpufreq_policy *policy, | |
168 | unsigned int event); | |
9e76988e VP |
169 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, |
170 | char *buf); | |
171 | int (*store_setspeed) (struct cpufreq_policy *policy, | |
172 | unsigned int freq); | |
1c256245 TR |
173 | unsigned int max_transition_latency; /* HW must be able to switch to |
174 | next freq faster than this value in nano secs or we | |
175 | will fallback to performance governor */ | |
1da177e4 LT |
176 | struct list_head governor_list; |
177 | struct module *owner; | |
178 | }; | |
179 | ||
180 | /* pass a target to the cpufreq driver | |
181 | */ | |
182 | extern int cpufreq_driver_target(struct cpufreq_policy *policy, | |
183 | unsigned int target_freq, | |
184 | unsigned int relation); | |
185 | extern int __cpufreq_driver_target(struct cpufreq_policy *policy, | |
186 | unsigned int target_freq, | |
187 | unsigned int relation); | |
188 | ||
189 | ||
bf0b90e3 | 190 | extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy, |
191 | unsigned int cpu); | |
dfde5d62 | 192 | |
1da177e4 LT |
193 | int cpufreq_register_governor(struct cpufreq_governor *governor); |
194 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
195 | ||
5a01f2e8 VP |
196 | int lock_policy_rwsem_read(int cpu); |
197 | int lock_policy_rwsem_write(int cpu); | |
198 | void unlock_policy_rwsem_read(int cpu); | |
199 | void unlock_policy_rwsem_write(int cpu); | |
200 | ||
1da177e4 LT |
201 | |
202 | /********************************************************************* | |
203 | * CPUFREQ DRIVER INTERFACE * | |
204 | *********************************************************************/ | |
205 | ||
206 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ | |
207 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ | |
208 | ||
209 | struct freq_attr; | |
210 | ||
211 | struct cpufreq_driver { | |
212 | struct module *owner; | |
213 | char name[CPUFREQ_NAME_LEN]; | |
214 | u8 flags; | |
215 | ||
216 | /* needed by all drivers */ | |
217 | int (*init) (struct cpufreq_policy *policy); | |
218 | int (*verify) (struct cpufreq_policy *policy); | |
219 | ||
220 | /* define one out of two */ | |
221 | int (*setpolicy) (struct cpufreq_policy *policy); | |
222 | int (*target) (struct cpufreq_policy *policy, | |
223 | unsigned int target_freq, | |
224 | unsigned int relation); | |
225 | ||
226 | /* should be defined, if possible */ | |
227 | unsigned int (*get) (unsigned int cpu); | |
228 | ||
229 | /* optional */ | |
bf0b90e3 | 230 | unsigned int (*getavg) (struct cpufreq_policy *policy, |
231 | unsigned int cpu); | |
232 | ||
1da177e4 | 233 | int (*exit) (struct cpufreq_policy *policy); |
e00d9967 | 234 | int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg); |
1da177e4 LT |
235 | int (*resume) (struct cpufreq_policy *policy); |
236 | struct freq_attr **attr; | |
e088e4c9 | 237 | bool hide_interface; |
1da177e4 LT |
238 | }; |
239 | ||
240 | /* flags */ | |
241 | ||
242 | #define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if | |
243 | * all ->init() calls failed */ | |
244 | #define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel | |
245 | * "constants" aren't affected by | |
246 | * frequency transitions */ | |
42d4dc3f BH |
247 | #define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed |
248 | * mismatches */ | |
1da177e4 | 249 | |
221dee28 LT |
250 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
251 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
1da177e4 LT |
252 | |
253 | ||
254 | void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state); | |
255 | ||
256 | ||
257 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max) | |
258 | { | |
259 | if (policy->min < min) | |
260 | policy->min = min; | |
261 | if (policy->max < min) | |
262 | policy->max = min; | |
263 | if (policy->min > max) | |
264 | policy->min = max; | |
265 | if (policy->max > max) | |
266 | policy->max = max; | |
267 | if (policy->min > policy->max) | |
268 | policy->min = policy->max; | |
269 | return; | |
270 | } | |
271 | ||
272 | struct freq_attr { | |
273 | struct attribute attr; | |
274 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
275 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
276 | }; | |
277 | ||
278 | ||
279 | /********************************************************************* | |
280 | * CPUFREQ 2.6. INTERFACE * | |
281 | *********************************************************************/ | |
1da177e4 LT |
282 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); |
283 | int cpufreq_update_policy(unsigned int cpu); | |
284 | ||
ff0ce684 LT |
285 | /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ |
286 | unsigned int cpufreq_get(unsigned int cpu); | |
1da177e4 | 287 | |
ff0ce684 | 288 | /* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */ |
95235ca2 VP |
289 | #ifdef CONFIG_CPU_FREQ |
290 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
291 | #else | |
292 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
293 | { | |
294 | return 0; | |
295 | } | |
296 | #endif | |
297 | ||
1da177e4 LT |
298 | |
299 | /********************************************************************* | |
300 | * CPUFREQ DEFAULT GOVERNOR * | |
301 | *********************************************************************/ | |
302 | ||
303 | ||
1c256245 TR |
304 | /* |
305 | Performance governor is fallback governor if any other gov failed to | |
306 | auto load due latency restrictions | |
307 | */ | |
6afde10c | 308 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
1da177e4 | 309 | extern struct cpufreq_governor cpufreq_gov_performance; |
6afde10c | 310 | #endif |
1c256245 TR |
311 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
312 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) | |
30d221db AG |
313 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE) |
314 | extern struct cpufreq_governor cpufreq_gov_powersave; | |
315 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave) | |
1da177e4 LT |
316 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) |
317 | extern struct cpufreq_governor cpufreq_gov_userspace; | |
1c256245 TR |
318 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace) |
319 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND) | |
320 | extern struct cpufreq_governor cpufreq_gov_ondemand; | |
321 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand) | |
322 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE) | |
323 | extern struct cpufreq_governor cpufreq_gov_conservative; | |
324 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative) | |
1da177e4 LT |
325 | #endif |
326 | ||
327 | ||
328 | /********************************************************************* | |
329 | * FREQUENCY TABLE HELPERS * | |
330 | *********************************************************************/ | |
331 | ||
332 | #define CPUFREQ_ENTRY_INVALID ~0 | |
333 | #define CPUFREQ_TABLE_END ~1 | |
334 | ||
335 | struct cpufreq_frequency_table { | |
336 | unsigned int index; /* any */ | |
337 | unsigned int frequency; /* kHz - doesn't need to be in ascending | |
338 | * order */ | |
339 | }; | |
340 | ||
341 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
342 | struct cpufreq_frequency_table *table); | |
343 | ||
344 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
345 | struct cpufreq_frequency_table *table); | |
346 | ||
347 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
348 | struct cpufreq_frequency_table *table, | |
349 | unsigned int target_freq, | |
350 | unsigned int relation, | |
351 | unsigned int *index); | |
352 | ||
353 | /* the following 3 funtions are for cpufreq core use only */ | |
354 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); | |
355 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); | |
356 | void cpufreq_cpu_put (struct cpufreq_policy *data); | |
357 | ||
358 | /* the following are really really optional */ | |
359 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
360 | ||
361 | void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, | |
362 | unsigned int cpu); | |
363 | ||
364 | void cpufreq_frequency_table_put_attr(unsigned int cpu); | |
365 | ||
366 | ||
367 | /********************************************************************* | |
368 | * UNIFIED DEBUG HELPERS * | |
369 | *********************************************************************/ | |
370 | ||
371 | #define CPUFREQ_DEBUG_CORE 1 | |
372 | #define CPUFREQ_DEBUG_DRIVER 2 | |
373 | #define CPUFREQ_DEBUG_GOVERNOR 4 | |
374 | ||
375 | #ifdef CONFIG_CPU_FREQ_DEBUG | |
376 | ||
377 | extern void cpufreq_debug_printk(unsigned int type, const char *prefix, | |
378 | const char *fmt, ...); | |
379 | ||
380 | #else | |
381 | ||
382 | #define cpufreq_debug_printk(msg...) do { } while(0) | |
383 | ||
384 | #endif /* CONFIG_CPU_FREQ_DEBUG */ | |
385 | ||
386 | #endif /* _LINUX_CPUFREQ_H */ |