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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Viresh Kumarbb176f72013-06-19 14:19:33 +05302 * linux/include/linux/cpufreq.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Viresh Kumarbb176f72013-06-19 14:19:33 +05304 * Copyright (C) 2001 Russell King
5 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
Thiago Farina335dc332011-04-28 20:42:53 -03006 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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
viresh kumar2aacdff2012-10-23 01:28:05 +020014#include <asm/cputime.h>
Arjan van de Ven83933af2006-01-14 16:01:49 +010015#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/notifier.h>
17#include <linux/threads.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/kobject.h>
19#include <linux/sysfs.h>
20#include <linux/completion.h>
21#include <linux/workqueue.h>
22#include <linux/cpumask.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080023#include <asm/div64.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#define CPUFREQ_NAME_LEN 16
viresh kumar4b972f02012-10-23 01:23:43 +020026/* Print length for names. Extra 1 space for accomodating '\n' in prints */
27#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029/*********************************************************************
30 * CPUFREQ NOTIFIER INTERFACE *
31 *********************************************************************/
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#define CPUFREQ_TRANSITION_NOTIFIER (0)
34#define CPUFREQ_POLICY_NOTIFIER (1)
35
Satyam Sharma6070b5d2007-10-02 13:28:15 -070036#ifdef CONFIG_CPU_FREQ
37int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
38int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
Konrad Rzeszutek Wilka7b422c2012-03-13 19:18:39 -040039extern void disable_cpufreq(void);
Satyam Sharma6070b5d2007-10-02 13:28:15 -070040#else /* CONFIG_CPU_FREQ */
41static inline int cpufreq_register_notifier(struct notifier_block *nb,
42 unsigned int list)
43{
44 return 0;
45}
46static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
47 unsigned int list)
48{
49 return 0;
50}
Konrad Rzeszutek Wilka7b422c2012-03-13 19:18:39 -040051static inline void disable_cpufreq(void) { }
Satyam Sharma6070b5d2007-10-02 13:28:15 -070052#endif /* CONFIG_CPU_FREQ */
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
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
Thiago Farina335dc332011-04-28 20:42:53 -030062/* 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.
Dave Jonesb53cc6e2005-05-31 19:03:47 -070065 * Maximum transition latency is in nanoseconds - if it's unknown,
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 * CPUFREQ_ETERNAL shall be used.
67 */
68
69struct cpufreq_governor;
70
Thomas Renninger8aa84ad2009-07-24 15:25:05 +020071/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
72extern struct kobject *cpufreq_global_kobject;
Viresh Kumar2361be22013-05-17 16:09:09 +053073int cpufreq_get_global_kobject(void);
74void cpufreq_put_global_kobject(void);
75int cpufreq_sysfs_create_file(const struct attribute *attr);
76void cpufreq_sysfs_remove_file(const struct attribute *attr);
Thomas Renninger8aa84ad2009-07-24 15:25:05 +020077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#define CPUFREQ_ETERNAL (-1)
79struct cpufreq_cpuinfo {
80 unsigned int max_freq;
81 unsigned int min_freq;
Thiago Farina335dc332011-04-28 20:42:53 -030082
83 /* in 10^(-9) s = nanoseconds */
84 unsigned int transition_latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085};
86
87struct cpufreq_real_policy {
88 unsigned int min; /* in kHz */
89 unsigned int max; /* in kHz */
Thiago Farina335dc332011-04-28 20:42:53 -030090 unsigned int policy; /* see above */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 struct cpufreq_governor *governor; /* see below */
92};
93
94struct cpufreq_policy {
Viresh Kumar951fc5f2013-01-31 02:03:53 +000095 /* CPUs sharing clock, require sw coordination */
96 cpumask_var_t cpus; /* Online CPUs only */
97 cpumask_var_t related_cpus; /* Online + Offline CPUs */
98
Viresh Kumar62b36cc2013-02-01 06:40:02 +000099 unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -0500100 should set cpufreq */
Viresh Kumarb8eed8a2013-01-14 13:23:03 +0000101 unsigned int cpu; /* cpu nr of CPU managing this policy */
102 unsigned int last_cpu; /* cpu nr of previous CPU that managed
103 * this policy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 struct cpufreq_cpuinfo cpuinfo;/* see above */
105
106 unsigned int min; /* in kHz */
107 unsigned int max; /* in kHz */
108 unsigned int cur; /* in kHz, only needed if cpufreq
109 * governors are used */
Thiago Farina335dc332011-04-28 20:42:53 -0300110 unsigned int policy; /* see above */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 struct cpufreq_governor *governor; /* see below */
Viresh Kumar7bd353a2013-03-27 15:58:57 +0000112 void *governor_data;
Xiaoguang Chen95731eb2013-06-19 15:00:07 +0800113 bool governor_enabled; /* governor start/stop flag */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 struct work_struct update; /* if update_policy() needs to be
116 * called, but you're in IRQ context */
117
118 struct cpufreq_real_policy user_policy;
119
120 struct kobject kobj;
121 struct completion kobj_unregister;
Viresh Kumar266c13d2013-07-02 16:36:28 +0530122 int transition_ongoing; /* Tracks transition status */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123};
124
Viresh Kumarb8eed8a2013-01-14 13:23:03 +0000125#define CPUFREQ_ADJUST (0)
126#define CPUFREQ_INCOMPATIBLE (1)
127#define CPUFREQ_NOTIFY (2)
128#define CPUFREQ_START (3)
129#define CPUFREQ_UPDATE_POLICY_CPU (4)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Viresh Kumar62b36cc2013-02-01 06:40:02 +0000131/* Only for ACPI */
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400132#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
133#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
134#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
135#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Fabio Baltieri2624f902013-01-31 09:44:40 +0000137static inline bool policy_is_shared(struct cpufreq_policy *policy)
138{
139 return cpumask_weight(policy->cpus) > 1;
140}
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142/******************** cpufreq transition notifiers *******************/
143
144#define CPUFREQ_PRECHANGE (0)
145#define CPUFREQ_POSTCHANGE (1)
146#define CPUFREQ_RESUMECHANGE (8)
Benjamin Herrenschmidt42d4dc32005-04-29 07:40:12 -0700147#define CPUFREQ_SUSPENDCHANGE (9)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149struct cpufreq_freqs {
150 unsigned int cpu; /* cpu nr */
151 unsigned int old;
152 unsigned int new;
153 u8 flags; /* flags of cpufreq_driver, see below. */
154};
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156/**
Viresh Kumarbb176f72013-06-19 14:19:33 +0530157 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
158 * safe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 * @old: old value
160 * @div: divisor
161 * @mult: multiplier
162 *
163 *
Viresh Kumarbb176f72013-06-19 14:19:33 +0530164 * new = old * mult / div
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 */
Viresh Kumarbb176f72013-06-19 14:19:33 +0530166static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
167 u_int mult)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
169#if BITS_PER_LONG == 32
170
171 u64 result = ((u64) old) * ((u64) mult);
172 do_div(result, div);
173 return (unsigned long) result;
174
175#elif BITS_PER_LONG == 64
176
177 unsigned long result = old * ((u64) mult);
178 result /= div;
179 return result;
180
181#endif
182};
183
184/*********************************************************************
185 * CPUFREQ GOVERNORS *
186 *********************************************************************/
187
Viresh Kumar7bd353a2013-03-27 15:58:57 +0000188#define CPUFREQ_GOV_START 1
189#define CPUFREQ_GOV_STOP 2
190#define CPUFREQ_GOV_LIMITS 3
191#define CPUFREQ_GOV_POLICY_INIT 4
192#define CPUFREQ_GOV_POLICY_EXIT 5
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194struct cpufreq_governor {
195 char name[CPUFREQ_NAME_LEN];
Viresh Kumarb3940582013-02-01 05:42:58 +0000196 int initialized;
Thiago Farina335dc332011-04-28 20:42:53 -0300197 int (*governor) (struct cpufreq_policy *policy,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 unsigned int event);
Venki Pallipadi9e769882007-10-26 10:18:21 -0700199 ssize_t (*show_setspeed) (struct cpufreq_policy *policy,
200 char *buf);
Thiago Farina335dc332011-04-28 20:42:53 -0300201 int (*store_setspeed) (struct cpufreq_policy *policy,
Venki Pallipadi9e769882007-10-26 10:18:21 -0700202 unsigned int freq);
Thomas Renninger1c256242007-10-02 13:28:12 -0700203 unsigned int max_transition_latency; /* HW must be able to switch to
204 next freq faster than this value in nano secs or we
205 will fallback to performance governor */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 struct list_head governor_list;
207 struct module *owner;
208};
209
Thiago Farina335dc332011-04-28 20:42:53 -0300210/*
211 * Pass a target to the cpufreq driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 */
213extern int cpufreq_driver_target(struct cpufreq_policy *policy,
214 unsigned int target_freq,
215 unsigned int relation);
216extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
217 unsigned int target_freq,
218 unsigned int relation);
219
venkatesh.pallipadi@intel.combf0b90e2008-08-04 11:59:07 -0700220extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy,
221 unsigned int cpu);
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223int cpufreq_register_governor(struct cpufreq_governor *governor);
224void cpufreq_unregister_governor(struct cpufreq_governor *governor);
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226/*********************************************************************
227 * CPUFREQ DRIVER INTERFACE *
228 *********************************************************************/
229
230#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
231#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
232
233struct freq_attr;
234
235struct cpufreq_driver {
Viresh Kumarbb176f72013-06-19 14:19:33 +0530236 struct module *owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 char name[CPUFREQ_NAME_LEN];
238 u8 flags;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000239 /*
240 * This should be set by platforms having multiple clock-domains, i.e.
241 * supporting multiple policies. With this sysfs directories of governor
242 * would be created in cpu/cpu<num>/cpufreq/ directory and so they can
243 * use the same governor with different tunables for different clusters.
244 */
245 bool have_governor_per_policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247 /* needed by all drivers */
248 int (*init) (struct cpufreq_policy *policy);
249 int (*verify) (struct cpufreq_policy *policy);
250
251 /* define one out of two */
252 int (*setpolicy) (struct cpufreq_policy *policy);
253 int (*target) (struct cpufreq_policy *policy,
254 unsigned int target_freq,
255 unsigned int relation);
256
257 /* should be defined, if possible */
258 unsigned int (*get) (unsigned int cpu);
259
260 /* optional */
venkatesh.pallipadi@intel.combf0b90e2008-08-04 11:59:07 -0700261 unsigned int (*getavg) (struct cpufreq_policy *policy,
262 unsigned int cpu);
Thomas Renningere2f74f32009-11-19 12:31:01 +0100263 int (*bios_limit) (int cpu, unsigned int *limit);
venkatesh.pallipadi@intel.combf0b90e2008-08-04 11:59:07 -0700264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 int (*exit) (struct cpufreq_policy *policy);
Rafael J. Wysocki7ca64e22011-03-10 21:13:05 +0100266 int (*suspend) (struct cpufreq_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 int (*resume) (struct cpufreq_policy *policy);
268 struct freq_attr **attr;
269};
270
271/* flags */
272
Thiago Farina335dc332011-04-28 20:42:53 -0300273#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 * all ->init() calls failed */
Thiago Farina335dc332011-04-28 20:42:53 -0300275#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 * "constants" aren't affected by
277 * frequency transitions */
Benjamin Herrenschmidt42d4dc32005-04-29 07:40:12 -0700278#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
279 * mismatches */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Linus Torvalds221dee22007-02-26 14:55:48 -0800281int cpufreq_register_driver(struct cpufreq_driver *driver_data);
282int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530284void cpufreq_notify_transition(struct cpufreq_policy *policy,
285 struct cpufreq_freqs *freqs, unsigned int state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Viresh Kumarbb176f72013-06-19 14:19:33 +0530287static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
288 unsigned int min, unsigned int max)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289{
290 if (policy->min < min)
291 policy->min = min;
292 if (policy->max < min)
293 policy->max = min;
294 if (policy->min > max)
295 policy->min = max;
296 if (policy->max > max)
297 policy->max = max;
298 if (policy->min > policy->max)
299 policy->min = policy->max;
300 return;
301}
302
303struct freq_attr {
304 struct attribute attr;
305 ssize_t (*show)(struct cpufreq_policy *, char *);
306 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
307};
308
Borislav Petkov6dad2a22010-03-31 21:56:46 +0200309#define cpufreq_freq_attr_ro(_name) \
310static struct freq_attr _name = \
311__ATTR(_name, 0444, show_##_name, NULL)
312
313#define cpufreq_freq_attr_ro_perm(_name, _perm) \
314static struct freq_attr _name = \
315__ATTR(_name, _perm, show_##_name, NULL)
316
Borislav Petkov6dad2a22010-03-31 21:56:46 +0200317#define cpufreq_freq_attr_rw(_name) \
318static struct freq_attr _name = \
319__ATTR(_name, 0644, show_##_name, store_##_name)
320
Thomas Renninger8aa84ad2009-07-24 15:25:05 +0200321struct global_attr {
322 struct attribute attr;
323 ssize_t (*show)(struct kobject *kobj,
324 struct attribute *attr, char *buf);
325 ssize_t (*store)(struct kobject *a, struct attribute *b,
326 const char *c, size_t count);
327};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Borislav Petkov6dad2a22010-03-31 21:56:46 +0200329#define define_one_global_ro(_name) \
330static struct global_attr _name = \
331__ATTR(_name, 0444, show_##_name, NULL)
332
333#define define_one_global_rw(_name) \
334static struct global_attr _name = \
335__ATTR(_name, 0644, show_##_name, store_##_name)
336
Borislav Petkovab45bd92013-01-28 14:50:39 +0100337struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
338void cpufreq_cpu_put(struct cpufreq_policy *data);
339const char *cpufreq_get_current_driver(void);
Borislav Petkov6dad2a22010-03-31 21:56:46 +0200340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341/*********************************************************************
342 * CPUFREQ 2.6. INTERFACE *
343 *********************************************************************/
Viresh Kumar72a4ce32013-05-17 11:26:32 +0000344u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
346int cpufreq_update_policy(unsigned int cpu);
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000347bool have_governor_per_policy(void);
Viresh Kumar944e9a02013-05-16 05:09:57 +0000348struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Randy Dunlap2eca40a2009-10-26 16:49:29 -0700350#ifdef CONFIG_CPU_FREQ
Viresh Kumarbb176f72013-06-19 14:19:33 +0530351/*
352 * query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it
353 */
Linus Torvaldsff0ce682007-09-26 15:52:17 -0700354unsigned int cpufreq_get(unsigned int cpu);
Randy Dunlap2eca40a2009-10-26 16:49:29 -0700355#else
356static inline unsigned int cpufreq_get(unsigned int cpu)
357{
358 return 0;
359}
360#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Viresh Kumarbb176f72013-06-19 14:19:33 +0530362/*
363 * query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it
364 */
Venkatesh Pallipadi95235ca2005-12-02 10:43:20 -0800365#ifdef CONFIG_CPU_FREQ
366unsigned int cpufreq_quick_get(unsigned int cpu);
Jesse Barnes3d737102011-06-28 10:59:12 -0700367unsigned int cpufreq_quick_get_max(unsigned int cpu);
Venkatesh Pallipadi95235ca2005-12-02 10:43:20 -0800368#else
369static inline unsigned int cpufreq_quick_get(unsigned int cpu)
370{
371 return 0;
372}
Jesse Barnes3d737102011-06-28 10:59:12 -0700373static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
374{
375 return 0;
376}
Venkatesh Pallipadi95235ca2005-12-02 10:43:20 -0800377#endif
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379/*********************************************************************
380 * CPUFREQ DEFAULT GOVERNOR *
381 *********************************************************************/
382
Thomas Renninger1c256242007-10-02 13:28:12 -0700383/*
Viresh Kumarbb176f72013-06-19 14:19:33 +0530384 * Performance governor is fallback governor if any other gov failed to auto
385 * load due latency restrictions
386 */
Thomas Renninger6afde102007-10-02 13:28:13 -0700387#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388extern struct cpufreq_governor cpufreq_gov_performance;
Thomas Renninger6afde102007-10-02 13:28:13 -0700389#endif
Thomas Renninger1c256242007-10-02 13:28:12 -0700390#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
391#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
Alessandro Guido30d221d2008-04-18 13:31:13 -0700392#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
393extern struct cpufreq_governor cpufreq_gov_powersave;
394#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
396extern struct cpufreq_governor cpufreq_gov_userspace;
Thomas Renninger1c256242007-10-02 13:28:12 -0700397#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
398#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
399extern struct cpufreq_governor cpufreq_gov_ondemand;
400#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
401#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
402extern struct cpufreq_governor cpufreq_gov_conservative;
403#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404#endif
405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406/*********************************************************************
407 * FREQUENCY TABLE HELPERS *
408 *********************************************************************/
409
410#define CPUFREQ_ENTRY_INVALID ~0
411#define CPUFREQ_TABLE_END ~1
412
413struct cpufreq_frequency_table {
Viresh Kumar50701582013-03-30 16:25:15 +0530414 unsigned int driver_data; /* driver specific data, not used by core */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 unsigned int frequency; /* kHz - doesn't need to be in ascending
416 * order */
417};
418
419int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
420 struct cpufreq_frequency_table *table);
421
422int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
423 struct cpufreq_frequency_table *table);
424
425int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
426 struct cpufreq_frequency_table *table,
427 unsigned int target_freq,
428 unsigned int relation,
429 unsigned int *index);
430
431/* the following 3 funtions are for cpufreq core use only */
432struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434/* the following are really really optional */
435extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
436
Thiago Farina335dc332011-04-28 20:42:53 -0300437void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 unsigned int cpu);
Viresh Kumarb8eed8a2013-01-14 13:23:03 +0000439void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441void cpufreq_frequency_table_put_attr(unsigned int cpu);
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800442
443ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445#endif /* _LINUX_CPUFREQ_H */