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1 | /* | |
2 | * linux/include/linux/cpufreq.h | |
3 | * | |
4 | * Copyright (C) 2001 Russell King | |
5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> | |
6 | * | |
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 | ||
14 | #include <linux/mutex.h> | |
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> | |
23 | #include <asm/div64.h> | |
24 | ||
25 | #define CPUFREQ_NAME_LEN 16 | |
26 | ||
27 | ||
28 | /********************************************************************* | |
29 | * CPUFREQ NOTIFIER INTERFACE * | |
30 | *********************************************************************/ | |
31 | ||
32 | #define CPUFREQ_TRANSITION_NOTIFIER (0) | |
33 | #define CPUFREQ_POLICY_NOTIFIER (1) | |
34 | ||
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 */ | |
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. | |
62 | * Maximum transition latency is in nanoseconds - if it's unknown, | |
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 { | |
83 | cpumask_var_t cpus; /* CPUs requiring sw coordination */ | |
84 | cpumask_var_t related_cpus; /* CPUs with any coordination */ | |
85 | unsigned int shared_type; /* ANY or ALL affected CPUs | |
86 | should set cpufreq */ | |
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 | ||
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) | |
109 | #define CPUFREQ_START (3) | |
110 | ||
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*/ | |
115 | ||
116 | /******************** cpufreq transition notifiers *******************/ | |
117 | ||
118 | #define CPUFREQ_PRECHANGE (0) | |
119 | #define CPUFREQ_POSTCHANGE (1) | |
120 | #define CPUFREQ_RESUMECHANGE (8) | |
121 | #define CPUFREQ_SUSPENDCHANGE (9) | |
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); | |
169 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, | |
170 | char *buf); | |
171 | int (*store_setspeed) (struct cpufreq_policy *policy, | |
172 | unsigned int freq); | |
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 */ | |
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 | ||
190 | extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy, | |
191 | unsigned int cpu); | |
192 | ||
193 | int cpufreq_register_governor(struct cpufreq_governor *governor); | |
194 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
195 | ||
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 | ||
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 */ | |
230 | unsigned int (*getavg) (struct cpufreq_policy *policy, | |
231 | unsigned int cpu); | |
232 | ||
233 | int (*exit) (struct cpufreq_policy *policy); | |
234 | int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg); | |
235 | int (*resume) (struct cpufreq_policy *policy); | |
236 | struct freq_attr **attr; | |
237 | }; | |
238 | ||
239 | /* flags */ | |
240 | ||
241 | #define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if | |
242 | * all ->init() calls failed */ | |
243 | #define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel | |
244 | * "constants" aren't affected by | |
245 | * frequency transitions */ | |
246 | #define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed | |
247 | * mismatches */ | |
248 | ||
249 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); | |
250 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
251 | ||
252 | ||
253 | void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state); | |
254 | ||
255 | ||
256 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max) | |
257 | { | |
258 | if (policy->min < min) | |
259 | policy->min = min; | |
260 | if (policy->max < min) | |
261 | policy->max = min; | |
262 | if (policy->min > max) | |
263 | policy->min = max; | |
264 | if (policy->max > max) | |
265 | policy->max = max; | |
266 | if (policy->min > policy->max) | |
267 | policy->min = policy->max; | |
268 | return; | |
269 | } | |
270 | ||
271 | struct freq_attr { | |
272 | struct attribute attr; | |
273 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
274 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
275 | }; | |
276 | ||
277 | ||
278 | /********************************************************************* | |
279 | * CPUFREQ 2.6. INTERFACE * | |
280 | *********************************************************************/ | |
281 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); | |
282 | int cpufreq_update_policy(unsigned int cpu); | |
283 | ||
284 | /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ | |
285 | unsigned int cpufreq_get(unsigned int cpu); | |
286 | ||
287 | /* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */ | |
288 | #ifdef CONFIG_CPU_FREQ | |
289 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
290 | #else | |
291 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
292 | { | |
293 | return 0; | |
294 | } | |
295 | #endif | |
296 | ||
297 | ||
298 | /********************************************************************* | |
299 | * CPUFREQ DEFAULT GOVERNOR * | |
300 | *********************************************************************/ | |
301 | ||
302 | ||
303 | /* | |
304 | Performance governor is fallback governor if any other gov failed to | |
305 | auto load due latency restrictions | |
306 | */ | |
307 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE | |
308 | extern struct cpufreq_governor cpufreq_gov_performance; | |
309 | #endif | |
310 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE | |
311 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) | |
312 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE) | |
313 | extern struct cpufreq_governor cpufreq_gov_powersave; | |
314 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave) | |
315 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) | |
316 | extern struct cpufreq_governor cpufreq_gov_userspace; | |
317 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace) | |
318 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND) | |
319 | extern struct cpufreq_governor cpufreq_gov_ondemand; | |
320 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand) | |
321 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE) | |
322 | extern struct cpufreq_governor cpufreq_gov_conservative; | |
323 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative) | |
324 | #endif | |
325 | ||
326 | ||
327 | /********************************************************************* | |
328 | * FREQUENCY TABLE HELPERS * | |
329 | *********************************************************************/ | |
330 | ||
331 | #define CPUFREQ_ENTRY_INVALID ~0 | |
332 | #define CPUFREQ_TABLE_END ~1 | |
333 | ||
334 | struct cpufreq_frequency_table { | |
335 | unsigned int index; /* any */ | |
336 | unsigned int frequency; /* kHz - doesn't need to be in ascending | |
337 | * order */ | |
338 | }; | |
339 | ||
340 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
341 | struct cpufreq_frequency_table *table); | |
342 | ||
343 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
344 | struct cpufreq_frequency_table *table); | |
345 | ||
346 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
347 | struct cpufreq_frequency_table *table, | |
348 | unsigned int target_freq, | |
349 | unsigned int relation, | |
350 | unsigned int *index); | |
351 | ||
352 | /* the following 3 funtions are for cpufreq core use only */ | |
353 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); | |
354 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); | |
355 | void cpufreq_cpu_put (struct cpufreq_policy *data); | |
356 | ||
357 | /* the following are really really optional */ | |
358 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
359 | ||
360 | void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, | |
361 | unsigned int cpu); | |
362 | ||
363 | void cpufreq_frequency_table_put_attr(unsigned int cpu); | |
364 | ||
365 | ||
366 | /********************************************************************* | |
367 | * UNIFIED DEBUG HELPERS * | |
368 | *********************************************************************/ | |
369 | ||
370 | #define CPUFREQ_DEBUG_CORE 1 | |
371 | #define CPUFREQ_DEBUG_DRIVER 2 | |
372 | #define CPUFREQ_DEBUG_GOVERNOR 4 | |
373 | ||
374 | #ifdef CONFIG_CPU_FREQ_DEBUG | |
375 | ||
376 | extern void cpufreq_debug_printk(unsigned int type, const char *prefix, | |
377 | const char *fmt, ...); | |
378 | ||
379 | #else | |
380 | ||
381 | #define cpufreq_debug_printk(msg...) do { } while(0) | |
382 | ||
383 | #endif /* CONFIG_CPU_FREQ_DEBUG */ | |
384 | ||
385 | #endif /* _LINUX_CPUFREQ_H */ |