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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 | * | |
7 | * | |
8 | * $Id: cpufreq.h,v 1.36 2003/01/20 17:31:48 db Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | #ifndef _LINUX_CPUFREQ_H | |
15 | #define _LINUX_CPUFREQ_H | |
16 | ||
83933af4 | 17 | #include <linux/mutex.h> |
1da177e4 LT |
18 | #include <linux/notifier.h> |
19 | #include <linux/threads.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/kobject.h> | |
22 | #include <linux/sysfs.h> | |
23 | #include <linux/completion.h> | |
24 | #include <linux/workqueue.h> | |
25 | #include <linux/cpumask.h> | |
4e57b681 | 26 | #include <asm/div64.h> |
1da177e4 LT |
27 | |
28 | #define CPUFREQ_NAME_LEN 16 | |
29 | ||
30 | ||
31 | /********************************************************************* | |
32 | * CPUFREQ NOTIFIER INTERFACE * | |
33 | *********************************************************************/ | |
34 | ||
1da177e4 LT |
35 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
36 | #define CPUFREQ_POLICY_NOTIFIER (1) | |
37 | ||
6070b5de SS |
38 | #ifdef CONFIG_CPU_FREQ |
39 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); | |
40 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); | |
41 | #else /* CONFIG_CPU_FREQ */ | |
42 | static inline int cpufreq_register_notifier(struct notifier_block *nb, | |
43 | unsigned int list) | |
44 | { | |
45 | return 0; | |
46 | } | |
47 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, | |
48 | unsigned int list) | |
49 | { | |
50 | return 0; | |
51 | } | |
52 | #endif /* CONFIG_CPU_FREQ */ | |
1da177e4 LT |
53 | |
54 | /* if (cpufreq_driver->target) exists, the ->governor decides what frequency | |
55 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these | |
56 | * two generic policies are available: | |
57 | */ | |
58 | ||
59 | #define CPUFREQ_POLICY_POWERSAVE (1) | |
60 | #define CPUFREQ_POLICY_PERFORMANCE (2) | |
61 | ||
62 | /* Frequency values here are CPU kHz so that hardware which doesn't run | |
63 | * with some frequencies can complain without having to guess what per | |
64 | * cent / per mille means. | |
b53cc6ea | 65 | * Maximum transition latency is in nanoseconds - if it's unknown, |
1da177e4 LT |
66 | * CPUFREQ_ETERNAL shall be used. |
67 | */ | |
68 | ||
69 | struct cpufreq_governor; | |
70 | ||
71 | #define CPUFREQ_ETERNAL (-1) | |
72 | struct cpufreq_cpuinfo { | |
73 | unsigned int max_freq; | |
74 | unsigned int min_freq; | |
75 | unsigned int transition_latency; /* in 10^(-9) s = nanoseconds */ | |
76 | }; | |
77 | ||
78 | struct cpufreq_real_policy { | |
79 | unsigned int min; /* in kHz */ | |
80 | unsigned int max; /* in kHz */ | |
81 | unsigned int policy; /* see above */ | |
82 | struct cpufreq_governor *governor; /* see below */ | |
83 | }; | |
84 | ||
85 | struct cpufreq_policy { | |
86 | cpumask_t cpus; /* affected CPUs */ | |
3b2d9942 VP |
87 | unsigned int shared_type; /* ANY or ALL affected CPUs |
88 | should set cpufreq */ | |
1da177e4 LT |
89 | unsigned int cpu; /* cpu nr of registered CPU */ |
90 | struct cpufreq_cpuinfo cpuinfo;/* see above */ | |
91 | ||
92 | unsigned int min; /* in kHz */ | |
93 | unsigned int max; /* in kHz */ | |
94 | unsigned int cur; /* in kHz, only needed if cpufreq | |
95 | * governors are used */ | |
96 | unsigned int policy; /* see above */ | |
97 | struct cpufreq_governor *governor; /* see below */ | |
98 | ||
1da177e4 LT |
99 | struct work_struct update; /* if update_policy() needs to be |
100 | * called, but you're in IRQ context */ | |
101 | ||
102 | struct cpufreq_real_policy user_policy; | |
103 | ||
104 | struct kobject kobj; | |
105 | struct completion kobj_unregister; | |
106 | }; | |
107 | ||
108 | #define CPUFREQ_ADJUST (0) | |
109 | #define CPUFREQ_INCOMPATIBLE (1) | |
110 | #define CPUFREQ_NOTIFY (2) | |
111 | ||
46f18e3a VP |
112 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
113 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ | |
114 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ | |
115 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ | |
1da177e4 LT |
116 | |
117 | /******************** cpufreq transition notifiers *******************/ | |
118 | ||
119 | #define CPUFREQ_PRECHANGE (0) | |
120 | #define CPUFREQ_POSTCHANGE (1) | |
121 | #define CPUFREQ_RESUMECHANGE (8) | |
42d4dc3f | 122 | #define CPUFREQ_SUSPENDCHANGE (9) |
1da177e4 LT |
123 | |
124 | struct cpufreq_freqs { | |
125 | unsigned int cpu; /* cpu nr */ | |
126 | unsigned int old; | |
127 | unsigned int new; | |
128 | u8 flags; /* flags of cpufreq_driver, see below. */ | |
129 | }; | |
130 | ||
131 | ||
132 | /** | |
133 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe) | |
134 | * @old: old value | |
135 | * @div: divisor | |
136 | * @mult: multiplier | |
137 | * | |
138 | * | |
139 | * new = old * mult / div | |
140 | */ | |
141 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult) | |
142 | { | |
143 | #if BITS_PER_LONG == 32 | |
144 | ||
145 | u64 result = ((u64) old) * ((u64) mult); | |
146 | do_div(result, div); | |
147 | return (unsigned long) result; | |
148 | ||
149 | #elif BITS_PER_LONG == 64 | |
150 | ||
151 | unsigned long result = old * ((u64) mult); | |
152 | result /= div; | |
153 | return result; | |
154 | ||
155 | #endif | |
156 | }; | |
157 | ||
158 | /********************************************************************* | |
159 | * CPUFREQ GOVERNORS * | |
160 | *********************************************************************/ | |
161 | ||
162 | #define CPUFREQ_GOV_START 1 | |
163 | #define CPUFREQ_GOV_STOP 2 | |
164 | #define CPUFREQ_GOV_LIMITS 3 | |
165 | ||
166 | struct cpufreq_governor { | |
167 | char name[CPUFREQ_NAME_LEN]; | |
168 | int (*governor) (struct cpufreq_policy *policy, | |
169 | unsigned int event); | |
1c256245 TR |
170 | unsigned int max_transition_latency; /* HW must be able to switch to |
171 | next freq faster than this value in nano secs or we | |
172 | will fallback to performance governor */ | |
1da177e4 LT |
173 | struct list_head governor_list; |
174 | struct module *owner; | |
175 | }; | |
176 | ||
177 | /* pass a target to the cpufreq driver | |
178 | */ | |
179 | extern int cpufreq_driver_target(struct cpufreq_policy *policy, | |
180 | unsigned int target_freq, | |
181 | unsigned int relation); | |
182 | extern int __cpufreq_driver_target(struct cpufreq_policy *policy, | |
183 | unsigned int target_freq, | |
184 | unsigned int relation); | |
185 | ||
186 | ||
5a01f2e8 | 187 | extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy); |
dfde5d62 | 188 | |
1da177e4 LT |
189 | int cpufreq_register_governor(struct cpufreq_governor *governor); |
190 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
191 | ||
5a01f2e8 VP |
192 | int lock_policy_rwsem_read(int cpu); |
193 | int lock_policy_rwsem_write(int cpu); | |
194 | void unlock_policy_rwsem_read(int cpu); | |
195 | void unlock_policy_rwsem_write(int cpu); | |
196 | ||
1da177e4 LT |
197 | |
198 | /********************************************************************* | |
199 | * CPUFREQ DRIVER INTERFACE * | |
200 | *********************************************************************/ | |
201 | ||
202 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ | |
203 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ | |
204 | ||
205 | struct freq_attr; | |
206 | ||
207 | struct cpufreq_driver { | |
208 | struct module *owner; | |
209 | char name[CPUFREQ_NAME_LEN]; | |
210 | u8 flags; | |
211 | ||
212 | /* needed by all drivers */ | |
213 | int (*init) (struct cpufreq_policy *policy); | |
214 | int (*verify) (struct cpufreq_policy *policy); | |
215 | ||
216 | /* define one out of two */ | |
217 | int (*setpolicy) (struct cpufreq_policy *policy); | |
218 | int (*target) (struct cpufreq_policy *policy, | |
219 | unsigned int target_freq, | |
220 | unsigned int relation); | |
221 | ||
222 | /* should be defined, if possible */ | |
223 | unsigned int (*get) (unsigned int cpu); | |
224 | ||
225 | /* optional */ | |
dfde5d62 | 226 | unsigned int (*getavg) (unsigned int cpu); |
1da177e4 | 227 | int (*exit) (struct cpufreq_policy *policy); |
e00d9967 | 228 | int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg); |
1da177e4 LT |
229 | int (*resume) (struct cpufreq_policy *policy); |
230 | struct freq_attr **attr; | |
231 | }; | |
232 | ||
233 | /* flags */ | |
234 | ||
235 | #define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if | |
236 | * all ->init() calls failed */ | |
237 | #define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel | |
238 | * "constants" aren't affected by | |
239 | * frequency transitions */ | |
42d4dc3f BH |
240 | #define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed |
241 | * mismatches */ | |
1da177e4 | 242 | |
221dee28 LT |
243 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
244 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
1da177e4 LT |
245 | |
246 | ||
247 | void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state); | |
248 | ||
249 | ||
250 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max) | |
251 | { | |
252 | if (policy->min < min) | |
253 | policy->min = min; | |
254 | if (policy->max < min) | |
255 | policy->max = min; | |
256 | if (policy->min > max) | |
257 | policy->min = max; | |
258 | if (policy->max > max) | |
259 | policy->max = max; | |
260 | if (policy->min > policy->max) | |
261 | policy->min = policy->max; | |
262 | return; | |
263 | } | |
264 | ||
265 | struct freq_attr { | |
266 | struct attribute attr; | |
267 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
268 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
269 | }; | |
270 | ||
271 | ||
272 | /********************************************************************* | |
273 | * CPUFREQ 2.6. INTERFACE * | |
274 | *********************************************************************/ | |
1da177e4 LT |
275 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); |
276 | int cpufreq_update_policy(unsigned int cpu); | |
277 | ||
ff0ce684 LT |
278 | /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ |
279 | unsigned int cpufreq_get(unsigned int cpu); | |
1da177e4 | 280 | |
ff0ce684 | 281 | /* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */ |
95235ca2 VP |
282 | #ifdef CONFIG_CPU_FREQ |
283 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
284 | #else | |
285 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
286 | { | |
287 | return 0; | |
288 | } | |
289 | #endif | |
290 | ||
1da177e4 LT |
291 | |
292 | /********************************************************************* | |
293 | * CPUFREQ DEFAULT GOVERNOR * | |
294 | *********************************************************************/ | |
295 | ||
296 | ||
1c256245 TR |
297 | /* |
298 | Performance governor is fallback governor if any other gov failed to | |
299 | auto load due latency restrictions | |
300 | */ | |
6afde10c | 301 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
1da177e4 | 302 | extern struct cpufreq_governor cpufreq_gov_performance; |
6afde10c | 303 | #endif |
1c256245 TR |
304 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
305 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) | |
1da177e4 LT |
306 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) |
307 | extern struct cpufreq_governor cpufreq_gov_userspace; | |
1c256245 TR |
308 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace) |
309 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND) | |
310 | extern struct cpufreq_governor cpufreq_gov_ondemand; | |
311 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand) | |
312 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE) | |
313 | extern struct cpufreq_governor cpufreq_gov_conservative; | |
314 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative) | |
1da177e4 LT |
315 | #endif |
316 | ||
317 | ||
318 | /********************************************************************* | |
319 | * FREQUENCY TABLE HELPERS * | |
320 | *********************************************************************/ | |
321 | ||
322 | #define CPUFREQ_ENTRY_INVALID ~0 | |
323 | #define CPUFREQ_TABLE_END ~1 | |
324 | ||
325 | struct cpufreq_frequency_table { | |
326 | unsigned int index; /* any */ | |
327 | unsigned int frequency; /* kHz - doesn't need to be in ascending | |
328 | * order */ | |
329 | }; | |
330 | ||
331 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
332 | struct cpufreq_frequency_table *table); | |
333 | ||
334 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
335 | struct cpufreq_frequency_table *table); | |
336 | ||
337 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
338 | struct cpufreq_frequency_table *table, | |
339 | unsigned int target_freq, | |
340 | unsigned int relation, | |
341 | unsigned int *index); | |
342 | ||
343 | /* the following 3 funtions are for cpufreq core use only */ | |
344 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); | |
345 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); | |
346 | void cpufreq_cpu_put (struct cpufreq_policy *data); | |
347 | ||
348 | /* the following are really really optional */ | |
349 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
350 | ||
351 | void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, | |
352 | unsigned int cpu); | |
353 | ||
354 | void cpufreq_frequency_table_put_attr(unsigned int cpu); | |
355 | ||
356 | ||
357 | /********************************************************************* | |
358 | * UNIFIED DEBUG HELPERS * | |
359 | *********************************************************************/ | |
360 | ||
361 | #define CPUFREQ_DEBUG_CORE 1 | |
362 | #define CPUFREQ_DEBUG_DRIVER 2 | |
363 | #define CPUFREQ_DEBUG_GOVERNOR 4 | |
364 | ||
365 | #ifdef CONFIG_CPU_FREQ_DEBUG | |
366 | ||
367 | extern void cpufreq_debug_printk(unsigned int type, const char *prefix, | |
368 | const char *fmt, ...); | |
369 | ||
370 | #else | |
371 | ||
372 | #define cpufreq_debug_printk(msg...) do { } while(0) | |
373 | ||
374 | #endif /* CONFIG_CPU_FREQ_DEBUG */ | |
375 | ||
376 | #endif /* _LINUX_CPUFREQ_H */ |