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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / cpufreq.h
CommitLineData
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>
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
2aacdfff 14#include <asm/cputime.h>
83933af4 15#include <linux/mutex.h>
1da177e4
LT		 16#include <linux/notifier.h>
17#include <linux/threads.h>
1da177e4
LT		 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
4b972f0b 26/* Print length for names. Extra 1 space for accomodating '\n' in prints */
27#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
1da177e4
LT		 28
29
30/*********************************************************************
31 * CPUFREQ NOTIFIER INTERFACE *
32 *********************************************************************/
33
1da177e4
LT		 34#define CPUFREQ_TRANSITION_NOTIFIER (0)
35#define CPUFREQ_POLICY_NOTIFIER (1)
36
6070b5de
SS		 37#ifdef CONFIG_CPU_FREQ
38int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
39int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
a7b422cd 40extern void disable_cpufreq(void);
6070b5de
SS		 41#else /* CONFIG_CPU_FREQ */
42static inline int cpufreq_register_notifier(struct notifier_block *nb,
43 unsigned int list)
44{
45 return 0;
46}
47static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
48 unsigned int list)
49{
50 return 0;
51}
a7b422cd 52static inline void disable_cpufreq(void) { }
6070b5de 53#endif /* CONFIG_CPU_FREQ */
1da177e4
LT		 54
55/* if (cpufreq_driver->target) exists, the ->governor decides what frequency
56 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
57 * two generic policies are available:
58 */
59
60#define CPUFREQ_POLICY_POWERSAVE (1)
61#define CPUFREQ_POLICY_PERFORMANCE (2)
62
335dc333
TF		 63/* Frequency values here are CPU kHz so that hardware which doesn't run
64 * with some frequencies can complain without having to guess what per
65 * cent / per mille means.
b53cc6ea 66 * Maximum transition latency is in nanoseconds - if it's unknown,
1da177e4
LT		 67 * CPUFREQ_ETERNAL shall be used.
68 */
69
70struct cpufreq_governor;
71
8aa84ad8
TR		 72/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
73extern struct kobject *cpufreq_global_kobject;
74
1da177e4
LT		 75#define CPUFREQ_ETERNAL (-1)
76struct cpufreq_cpuinfo {
77 unsigned int max_freq;
78 unsigned int min_freq;
335dc333
TF		 79
80 /* in 10^(-9) s = nanoseconds */
81 unsigned int transition_latency;
1da177e4
LT		 82};
83
84struct cpufreq_real_policy {
85 unsigned int min; /* in kHz */
86 unsigned int max; /* in kHz */
335dc333 87 unsigned int policy; /* see above */
1da177e4
LT		 88 struct cpufreq_governor *governor; /* see below */
89};
90
91struct cpufreq_policy {
951fc5f4
VK		 92 /* CPUs sharing clock, require sw coordination */
93 cpumask_var_t cpus; /* Online CPUs only */
94 cpumask_var_t related_cpus; /* Online + Offline CPUs */
95
62b36cc1 96 unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
3b2d9942 97 should set cpufreq */
b8eed8af
VK		 98 unsigned int cpu; /* cpu nr of CPU managing this policy */
99 unsigned int last_cpu; /* cpu nr of previous CPU that managed
100 * this policy */
1da177e4
LT		 101 struct cpufreq_cpuinfo cpuinfo;/* see above */
102
103 unsigned int min; /* in kHz */
104 unsigned int max; /* in kHz */
105 unsigned int cur; /* in kHz, only needed if cpufreq
106 * governors are used */
335dc333 107 unsigned int policy; /* see above */
1da177e4
LT		 108 struct cpufreq_governor *governor; /* see below */
109
1da177e4
LT		 110 struct work_struct update; /* if update_policy() needs to be
111 * called, but you're in IRQ context */
112
113 struct cpufreq_real_policy user_policy;
114
115 struct kobject kobj;
116 struct completion kobj_unregister;
117};
118
b8eed8af
VK		 119#define CPUFREQ_ADJUST (0)
120#define CPUFREQ_INCOMPATIBLE (1)
121#define CPUFREQ_NOTIFY (2)
122#define CPUFREQ_START (3)
123#define CPUFREQ_UPDATE_POLICY_CPU (4)
1da177e4 124
62b36cc1 125/* Only for ACPI */
46f18e3a
VP		 126#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
127#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
128#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
129#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
1da177e4 130
2624f90c
FB		 131static inline bool policy_is_shared(struct cpufreq_policy *policy)
132{
133 return cpumask_weight(policy->cpus) > 1;
134}
135
1da177e4
LT		 136/******************** cpufreq transition notifiers *******************/
137
138#define CPUFREQ_PRECHANGE (0)
139#define CPUFREQ_POSTCHANGE (1)
140#define CPUFREQ_RESUMECHANGE (8)
42d4dc3f 141#define CPUFREQ_SUSPENDCHANGE (9)
1da177e4
LT		 142
143struct cpufreq_freqs {
144 unsigned int cpu; /* cpu nr */
145 unsigned int old;
146 unsigned int new;
147 u8 flags; /* flags of cpufreq_driver, see below. */
148};
149
150
151/**
152 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
153 * @old: old value
154 * @div: divisor
155 * @mult: multiplier
156 *
157 *
158 * new = old * mult / div
159 */
160static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
161{
162#if BITS_PER_LONG == 32
163
164 u64 result = ((u64) old) * ((u64) mult);
165 do_div(result, div);
166 return (unsigned long) result;
167
168#elif BITS_PER_LONG == 64
169
170 unsigned long result = old * ((u64) mult);
171 result /= div;
172 return result;
173
174#endif
175};
176
177/*********************************************************************
178 * CPUFREQ GOVERNORS *
179 *********************************************************************/
180
181#define CPUFREQ_GOV_START 1
182#define CPUFREQ_GOV_STOP 2
183#define CPUFREQ_GOV_LIMITS 3
184
185struct cpufreq_governor {
186 char name[CPUFREQ_NAME_LEN];
b394058f 187 int initialized;
335dc333 188 int (*governor) (struct cpufreq_policy *policy,
1da177e4 189 unsigned int event);
9e76988e
VP		 190 ssize_t (*show_setspeed) (struct cpufreq_policy *policy,
191 char *buf);
335dc333 192 int (*store_setspeed) (struct cpufreq_policy *policy,
9e76988e 193 unsigned int freq);
1c256245
TR		 194 unsigned int max_transition_latency; /* HW must be able to switch to
195 next freq faster than this value in nano secs or we
196 will fallback to performance governor */
1da177e4
LT		 197 struct list_head governor_list;
198 struct module *owner;
199};
200
335dc333
TF		 201/*
202 * Pass a target to the cpufreq driver.
1da177e4
LT		 203 */
204extern int cpufreq_driver_target(struct cpufreq_policy *policy,
205 unsigned int target_freq,
206 unsigned int relation);
207extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
208 unsigned int target_freq,
209 unsigned int relation);
210
211
bf0b90e3 212extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
213 unsigned int cpu);
dfde5d62 214
1da177e4
LT		 215int cpufreq_register_governor(struct cpufreq_governor *governor);
216void cpufreq_unregister_governor(struct cpufreq_governor *governor);
217
218
219/*********************************************************************
220 * CPUFREQ DRIVER INTERFACE *
221 *********************************************************************/
222
223#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
224#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
225
226struct freq_attr;
227
228struct cpufreq_driver {
229 struct module *owner;
230 char name[CPUFREQ_NAME_LEN];
231 u8 flags;
232
233 /* needed by all drivers */
234 int (*init) (struct cpufreq_policy *policy);
235 int (*verify) (struct cpufreq_policy *policy);
236
237 /* define one out of two */
238 int (*setpolicy) (struct cpufreq_policy *policy);
239 int (*target) (struct cpufreq_policy *policy,
240 unsigned int target_freq,
241 unsigned int relation);
242
243 /* should be defined, if possible */
244 unsigned int (*get) (unsigned int cpu);
245
246 /* optional */
bf0b90e3 247 unsigned int (*getavg) (struct cpufreq_policy *policy,
248 unsigned int cpu);
e2f74f35 249 int (*bios_limit) (int cpu, unsigned int *limit);
bf0b90e3 250
1da177e4 251 int (*exit) (struct cpufreq_policy *policy);
7ca64e2d 252 int (*suspend) (struct cpufreq_policy *policy);
1da177e4
LT		 253 int (*resume) (struct cpufreq_policy *policy);
254 struct freq_attr **attr;
255};
256
257/* flags */
258
335dc333 259#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
1da177e4 260 * all ->init() calls failed */
335dc333 261#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
1da177e4
LT		 262 * "constants" aren't affected by
263 * frequency transitions */
42d4dc3f
BH		 264#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
265 * mismatches */
1da177e4 266
221dee28
LT		 267int cpufreq_register_driver(struct cpufreq_driver *driver_data);
268int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
1da177e4
LT		 269
270
271void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
272
273
335dc333 274static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max)
1da177e4
LT		 275{
276 if (policy->min < min)
277 policy->min = min;
278 if (policy->max < min)
279 policy->max = min;
280 if (policy->min > max)
281 policy->min = max;
282 if (policy->max > max)
283 policy->max = max;
284 if (policy->min > policy->max)
285 policy->min = policy->max;
286 return;
287}
288
289struct freq_attr {
290 struct attribute attr;
291 ssize_t (*show)(struct cpufreq_policy *, char *);
292 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
293};
294
6dad2a29
BP		 295#define cpufreq_freq_attr_ro(_name) \
296static struct freq_attr _name = \
297__ATTR(_name, 0444, show_##_name, NULL)
298
299#define cpufreq_freq_attr_ro_perm(_name, _perm) \
300static struct freq_attr _name = \
301__ATTR(_name, _perm, show_##_name, NULL)
302
6dad2a29
BP		 303#define cpufreq_freq_attr_rw(_name) \
304static struct freq_attr _name = \
305__ATTR(_name, 0644, show_##_name, store_##_name)
306
8aa84ad8
TR		 307struct global_attr {
308 struct attribute attr;
309 ssize_t (*show)(struct kobject *kobj,
310 struct attribute *attr, char *buf);
311 ssize_t (*store)(struct kobject *a, struct attribute *b,
312 const char *c, size_t count);
313};
1da177e4 314
6dad2a29
BP		 315#define define_one_global_ro(_name) \
316static struct global_attr _name = \
317__ATTR(_name, 0444, show_##_name, NULL)
318
319#define define_one_global_rw(_name) \
320static struct global_attr _name = \
321__ATTR(_name, 0644, show_##_name, store_##_name)
322
ab45bd9b
BP		 323struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
324void cpufreq_cpu_put(struct cpufreq_policy *data);
325const char *cpufreq_get_current_driver(void);
6dad2a29 326
1da177e4
LT		 327/*********************************************************************
328 * CPUFREQ 2.6. INTERFACE *
329 *********************************************************************/
1da177e4
LT		 330int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
331int cpufreq_update_policy(unsigned int cpu);
332
2eca40a8 333#ifdef CONFIG_CPU_FREQ
ff0ce684
LT		 334/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
335unsigned int cpufreq_get(unsigned int cpu);
2eca40a8
RD		 336#else
337static inline unsigned int cpufreq_get(unsigned int cpu)
338{
339 return 0;
340}
341#endif
1da177e4 342
ff0ce684 343/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
95235ca2
VP		 344#ifdef CONFIG_CPU_FREQ
345unsigned int cpufreq_quick_get(unsigned int cpu);
3d737108 346unsigned int cpufreq_quick_get_max(unsigned int cpu);
95235ca2
VP		 347#else
348static inline unsigned int cpufreq_quick_get(unsigned int cpu)
349{
350 return 0;
351}
3d737108
JB		 352static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
353{
354 return 0;
355}
95235ca2
VP		 356#endif
357
1da177e4
LT		 358
359/*********************************************************************
360 * CPUFREQ DEFAULT GOVERNOR *
361 *********************************************************************/
362
363
1c256245
TR		 364/*
365 Performance governor is fallback governor if any other gov failed to
366 auto load due latency restrictions
367*/
6afde10c 368#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
1da177e4 369extern struct cpufreq_governor cpufreq_gov_performance;
6afde10c 370#endif
1c256245
TR		 371#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
372#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
30d221db
AG		 373#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
374extern struct cpufreq_governor cpufreq_gov_powersave;
375#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
1da177e4
LT		 376#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
377extern struct cpufreq_governor cpufreq_gov_userspace;
1c256245
TR		 378#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
379#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
380extern struct cpufreq_governor cpufreq_gov_ondemand;
381#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
382#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
383extern struct cpufreq_governor cpufreq_gov_conservative;
384#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
1da177e4
LT		 385#endif
386
387
388/*********************************************************************
389 * FREQUENCY TABLE HELPERS *
390 *********************************************************************/
391
392#define CPUFREQ_ENTRY_INVALID ~0
393#define CPUFREQ_TABLE_END ~1
394
395struct cpufreq_frequency_table {
396 unsigned int index; /* any */
397 unsigned int frequency; /* kHz - doesn't need to be in ascending
398 * order */
399};
400
401int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
402 struct cpufreq_frequency_table *table);
403
404int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
405 struct cpufreq_frequency_table *table);
406
407int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
408 struct cpufreq_frequency_table *table,
409 unsigned int target_freq,
410 unsigned int relation,
411 unsigned int *index);
412
413/* the following 3 funtions are for cpufreq core use only */
414struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
1da177e4
LT		 415
416/* the following are really really optional */
417extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
418
335dc333 419void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
1da177e4 420 unsigned int cpu);
b8eed8af 421void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy);
1da177e4
LT		 422
423void cpufreq_frequency_table_put_attr(unsigned int cpu);
1da177e4 424#endif /* _LINUX_CPUFREQ_H */
kernel source for telekom puls (alcatel/mediatek)