include/linux/cpufreq.h

   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/clk.h>
  15 #include <linux/cpumask.h>
  16 #include <linux/completion.h>
  17 #include <linux/kobject.h>
  18 #include <linux/notifier.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/sysfs.h>
  21
  22 /*********************************************************************
  23  *                        CPUFREQ INTERFACE                          *
  24  *********************************************************************/
  25 /*
  26  * Frequency values here are CPU kHz
  27  *
  28  * Maximum transition latency is in nanoseconds - if it's unknown,
  29  * CPUFREQ_ETERNAL shall be used.
  30  */
  31
  32 #define CPUFREQ_ETERNAL                 (-1)
  33 #define CPUFREQ_NAME_LEN                16
  34 /* Print length for names. Extra 1 space for accomodating '\n' in prints */
  35 #define CPUFREQ_NAME_PLEN               (CPUFREQ_NAME_LEN + 1)
  36
  37 struct cpufreq_governor;
  38
  39 struct cpufreq_freqs {
  40         unsigned int cpu;       /* cpu nr */
  41         unsigned int old;
  42         unsigned int new;
  43         u8 flags;               /* flags of cpufreq_driver, see below. */
  44 };
  45
  46 struct cpufreq_cpuinfo {
  47         unsigned int            max_freq;
  48         unsigned int            min_freq;
  49
  50         /* in 10^(-9) s = nanoseconds */
  51         unsigned int            transition_latency;
  52 };
  53
  54 struct cpufreq_real_policy {
  55         unsigned int            min;    /* in kHz */
  56         unsigned int            max;    /* in kHz */
  57         unsigned int            policy; /* see above */
  58         struct cpufreq_governor *governor; /* see below */
  59 };
  60
  61 struct cpufreq_policy {
  62         /* CPUs sharing clock, require sw coordination */
  63         cpumask_var_t           cpus;   /* Online CPUs only */
  64         cpumask_var_t           related_cpus; /* Online + Offline CPUs */
  65         cpumask_var_t           real_cpus; /* Related and present */
  66
  67         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
  68                                                 should set cpufreq */
  69         unsigned int            cpu;    /* cpu managing this policy, must be online */
  70         unsigned int            kobj_cpu; /* cpu managing sysfs files, can be offline */
  71
  72         struct clk              *clk;
  73         struct cpufreq_cpuinfo  cpuinfo;/* see above */
  74
  75         unsigned int            min;    /* in kHz */
  76         unsigned int            max;    /* in kHz */
  77         unsigned int            cur;    /* in kHz, only needed if cpufreq
  78                                          * governors are used */
  79         unsigned int            restore_freq; /* = policy->cur before transition */
  80         unsigned int            suspend_freq; /* freq to set during suspend */
  81
  82         unsigned int            policy; /* see above */
  83         struct cpufreq_governor *governor; /* see below */
  84         void                    *governor_data;
  85         bool                    governor_enabled; /* governor start/stop flag */
  86         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
  87
  88         struct work_struct      update; /* if update_policy() needs to be
  89                                          * called, but you're in IRQ context */
  90
  91         struct cpufreq_real_policy      user_policy;
  92         struct cpufreq_frequency_table  *freq_table;
  93
  94         struct list_head        policy_list;
  95         struct kobject          kobj;
  96         struct completion       kobj_unregister;
  97
  98         /*
  99          * The rules for this semaphore:
 100          * - Any routine that wants to read from the policy structure will
 101          *   do a down_read on this semaphore.
 102          * - Any routine that will write to the policy structure and/or may take away
 103          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
 104          *   mode before doing so.
 105          *
 106          * Additional rules:
 107          * - Lock should not be held across
 108          *     __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT);
 109          */
 110         struct rw_semaphore     rwsem;
 111
 112         /* Synchronization for frequency transitions */
 113         bool                    transition_ongoing; /* Tracks transition status */
 114         spinlock_t              transition_lock;
 115         wait_queue_head_t       transition_wait;
 116         struct task_struct      *transition_task; /* Task which is doing the transition */
 117
 118         /* cpufreq-stats */
 119         struct cpufreq_stats    *stats;
 120
 121         /* For cpufreq driver's internal use */
 122         void                    *driver_data;
 123 };
 124
 125 /* Only for ACPI */
 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*/
 130
 131 #ifdef CONFIG_CPU_FREQ
 132 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 133 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 134 #else
 135 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 136 {
 137         return NULL;
 138 }
 139 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 140 #endif
 141
 142 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 143 {
 144         return cpumask_weight(policy->cpus) > 1;
 145 }
 146
 147 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
 148 extern struct kobject *cpufreq_global_kobject;
 149 int cpufreq_get_global_kobject(void);
 150 void cpufreq_put_global_kobject(void);
 151 int cpufreq_sysfs_create_file(const struct attribute *attr);
 152 void cpufreq_sysfs_remove_file(const struct attribute *attr);
 153
 154 #ifdef CONFIG_CPU_FREQ
 155 unsigned int cpufreq_get(unsigned int cpu);
 156 unsigned int cpufreq_quick_get(unsigned int cpu);
 157 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 158 void disable_cpufreq(void);
 159
 160 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 161 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 162 int cpufreq_update_policy(unsigned int cpu);
 163 bool have_governor_per_policy(void);
 164 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 165 #else
 166 static inline unsigned int cpufreq_get(unsigned int cpu)
 167 {
 168         return 0;
 169 }
 170 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 171 {
 172         return 0;
 173 }
 174 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 175 {
 176         return 0;
 177 }
 178 static inline void disable_cpufreq(void) { }
 179 #endif
 180
 181 /*********************************************************************
 182  *                      CPUFREQ DRIVER INTERFACE                     *
 183  *********************************************************************/
 184
 185 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 186 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 187 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 188
 189 struct freq_attr {
 190         struct attribute attr;
 191         ssize_t (*show)(struct cpufreq_policy *, char *);
 192         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 193 };
 194
 195 #define cpufreq_freq_attr_ro(_name)             \
 196 static struct freq_attr _name =                 \
 197 __ATTR(_name, 0444, show_##_name, NULL)
 198
 199 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 200 static struct freq_attr _name =                 \
 201 __ATTR(_name, _perm, show_##_name, NULL)
 202
 203 #define cpufreq_freq_attr_rw(_name)             \
 204 static struct freq_attr _name =                 \
 205 __ATTR(_name, 0644, show_##_name, store_##_name)
 206
 207 struct global_attr {
 208         struct attribute attr;
 209         ssize_t (*show)(struct kobject *kobj,
 210                         struct attribute *attr, char *buf);
 211         ssize_t (*store)(struct kobject *a, struct attribute *b,
 212                          const char *c, size_t count);
 213 };
 214
 215 #define define_one_global_ro(_name)             \
 216 static struct global_attr _name =               \
 217 __ATTR(_name, 0444, show_##_name, NULL)
 218
 219 #define define_one_global_rw(_name)             \
 220 static struct global_attr _name =               \
 221 __ATTR(_name, 0644, show_##_name, store_##_name)
 222
 223
 224 struct cpufreq_driver {
 225         char            name[CPUFREQ_NAME_LEN];
 226         u8              flags;
 227         void            *driver_data;
 228
 229         /* needed by all drivers */
 230         int             (*init)(struct cpufreq_policy *policy);
 231         int             (*verify)(struct cpufreq_policy *policy);
 232
 233         /* define one out of two */
 234         int             (*setpolicy)(struct cpufreq_policy *policy);
 235
 236         /*
 237          * On failure, should always restore frequency to policy->restore_freq
 238          * (i.e. old freq).
 239          */
 240         int             (*target)(struct cpufreq_policy *policy,
 241                                   unsigned int target_freq,
 242                                   unsigned int relation);       /* Deprecated */
 243         int             (*target_index)(struct cpufreq_policy *policy,
 244                                         unsigned int index);
 245         /*
 246          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 247          * unset.
 248          *
 249          * get_intermediate should return a stable intermediate frequency
 250          * platform wants to switch to and target_intermediate() should set CPU
 251          * to to that frequency, before jumping to the frequency corresponding
 252          * to 'index'. Core will take care of sending notifications and driver
 253          * doesn't have to handle them in target_intermediate() or
 254          * target_index().
 255          *
 256          * Drivers can return '0' from get_intermediate() in case they don't
 257          * wish to switch to intermediate frequency for some target frequency.
 258          * In that case core will directly call ->target_index().
 259          */
 260         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 261                                             unsigned int index);
 262         int             (*target_intermediate)(struct cpufreq_policy *policy,
 263                                                unsigned int index);
 264
 265         /* should be defined, if possible */
 266         unsigned int    (*get)(unsigned int cpu);
 267
 268         /* optional */
 269         int             (*bios_limit)(int cpu, unsigned int *limit);
 270
 271         int             (*exit)(struct cpufreq_policy *policy);
 272         void            (*stop_cpu)(struct cpufreq_policy *policy);
 273         int             (*suspend)(struct cpufreq_policy *policy);
 274         int             (*resume)(struct cpufreq_policy *policy);
 275
 276         /* Will be called after the driver is fully initialized */
 277         void            (*ready)(struct cpufreq_policy *policy);
 278
 279         struct freq_attr **attr;
 280
 281         /* platform specific boost support code */
 282         bool            boost_supported;
 283         bool            boost_enabled;
 284         int             (*set_boost)(int state);
 285 };
 286
 287 /* flags */
 288 #define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
 289                                                    all ->init() calls failed */
 290 #define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
 291                                                    kernel "constants" aren't
 292                                                    affected by frequency
 293                                                    transitions */
 294 #define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
 295                                                    speed mismatches */
 296
 297 /*
 298  * This should be set by platforms having multiple clock-domains, i.e.
 299  * supporting multiple policies. With this sysfs directories of governor would
 300  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 301  * governor with different tunables for different clusters.
 302  */
 303 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
 304
 305 /*
 306  * Driver will do POSTCHANGE notifications from outside of their ->target()
 307  * routine and so must set cpufreq_driver->flags with this flag, so that core
 308  * can handle them specially.
 309  */
 310 #define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
 311
 312 /*
 313  * Set by drivers which want cpufreq core to check if CPU is running at a
 314  * frequency present in freq-table exposed by the driver. For these drivers if
 315  * CPU is found running at an out of table freq, we will try to set it to a freq
 316  * from the table. And if that fails, we will stop further boot process by
 317  * issuing a BUG_ON().
 318  */
 319 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
 320
 321 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 322 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 323
 324 const char *cpufreq_get_current_driver(void);
 325 void *cpufreq_get_driver_data(void);
 326
 327 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
 328                 unsigned int min, unsigned int max)
 329 {
 330         if (policy->min < min)
 331                 policy->min = min;
 332         if (policy->max < min)
 333                 policy->max = min;
 334         if (policy->min > max)
 335                 policy->min = max;
 336         if (policy->max > max)
 337                 policy->max = max;
 338         if (policy->min > policy->max)
 339                 policy->min = policy->max;
 340         return;
 341 }
 342
 343 static inline void
 344 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
 345 {
 346         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 347                         policy->cpuinfo.max_freq);
 348 }
 349
 350 #ifdef CONFIG_CPU_FREQ
 351 void cpufreq_suspend(void);
 352 void cpufreq_resume(void);
 353 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 354 #else
 355 static inline void cpufreq_suspend(void) {}
 356 static inline void cpufreq_resume(void) {}
 357 #endif
 358
 359 /*********************************************************************
 360  *                     CPUFREQ NOTIFIER INTERFACE                    *
 361  *********************************************************************/
 362
 363 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 364 #define CPUFREQ_POLICY_NOTIFIER         (1)
 365
 366 /* Transition notifiers */
 367 #define CPUFREQ_PRECHANGE               (0)
 368 #define CPUFREQ_POSTCHANGE              (1)
 369
 370 /* Policy Notifiers  */
 371 #define CPUFREQ_ADJUST                  (0)
 372 #define CPUFREQ_INCOMPATIBLE            (1)
 373 #define CPUFREQ_NOTIFY                  (2)
 374 #define CPUFREQ_START                   (3)
 375 #define CPUFREQ_CREATE_POLICY           (4)
 376 #define CPUFREQ_REMOVE_POLICY           (5)
 377
 378 #ifdef CONFIG_CPU_FREQ
 379 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 380 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 381
 382 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 383                 struct cpufreq_freqs *freqs);
 384 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 385                 struct cpufreq_freqs *freqs, int transition_failed);
 386
 387 #else /* CONFIG_CPU_FREQ */
 388 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 389                                                 unsigned int list)
 390 {
 391         return 0;
 392 }
 393 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 394                                                 unsigned int list)
 395 {
 396         return 0;
 397 }
 398 #endif /* !CONFIG_CPU_FREQ */
 399
 400 /**
 401  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 402  * safe)
 403  * @old:   old value
 404  * @div:   divisor
 405  * @mult:  multiplier
 406  *
 407  *
 408  * new = old * mult / div
 409  */
 410 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 411                 u_int mult)
 412 {
 413 #if BITS_PER_LONG == 32
 414         u64 result = ((u64) old) * ((u64) mult);
 415         do_div(result, div);
 416         return (unsigned long) result;
 417
 418 #elif BITS_PER_LONG == 64
 419         unsigned long result = old * ((u64) mult);
 420         result /= div;
 421         return result;
 422 #endif
 423 }
 424
 425 /*********************************************************************
 426  *                          CPUFREQ GOVERNORS                        *
 427  *********************************************************************/
 428
 429 /*
 430  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 431  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 432  * two generic policies are available:
 433  */
 434 #define CPUFREQ_POLICY_POWERSAVE        (1)
 435 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 436
 437 /* Governor Events */
 438 #define CPUFREQ_GOV_START       1
 439 #define CPUFREQ_GOV_STOP        2
 440 #define CPUFREQ_GOV_LIMITS      3
 441 #define CPUFREQ_GOV_POLICY_INIT 4
 442 #define CPUFREQ_GOV_POLICY_EXIT 5
 443
 444 struct cpufreq_governor {
 445         char    name[CPUFREQ_NAME_LEN];
 446         int     initialized;
 447         int     (*governor)     (struct cpufreq_policy *policy,
 448                                  unsigned int event);
 449         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 450                                          char *buf);
 451         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 452                                          unsigned int freq);
 453         unsigned int max_transition_latency; /* HW must be able to switch to
 454                         next freq faster than this value in nano secs or we
 455                         will fallback to performance governor */
 456         struct list_head        governor_list;
 457         struct module           *owner;
 458 };
 459
 460 /* Pass a target to the cpufreq driver */
 461 int cpufreq_driver_target(struct cpufreq_policy *policy,
 462                                  unsigned int target_freq,
 463                                  unsigned int relation);
 464 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 465                                    unsigned int target_freq,
 466                                    unsigned int relation);
 467 int cpufreq_register_governor(struct cpufreq_governor *governor);
 468 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 469
 470 /* CPUFREQ DEFAULT GOVERNOR */
 471 /*
 472  * Performance governor is fallback governor if any other gov failed to auto
 473  * load due latency restrictions
 474  */
 475 #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
 476 extern struct cpufreq_governor cpufreq_gov_performance;
 477 #endif
 478 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 479 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_performance)
 480 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
 481 extern struct cpufreq_governor cpufreq_gov_powersave;
 482 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_powersave)
 483 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
 484 extern struct cpufreq_governor cpufreq_gov_userspace;
 485 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_userspace)
 486 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
 487 extern struct cpufreq_governor cpufreq_gov_ondemand;
 488 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_ondemand)
 489 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
 490 extern struct cpufreq_governor cpufreq_gov_conservative;
 491 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_conservative)
 492 #endif
 493
 494 /*********************************************************************
 495  *                     FREQUENCY TABLE HELPERS                       *
 496  *********************************************************************/
 497
 498 /* Special Values of .frequency field */
 499 #define CPUFREQ_ENTRY_INVALID   ~0u
 500 #define CPUFREQ_TABLE_END       ~1u
 501 /* Special Values of .flags field */
 502 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 503
 504 struct cpufreq_frequency_table {
 505         unsigned int    flags;
 506         unsigned int    driver_data; /* driver specific data, not used by core */
 507         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 508                                     * order */
 509 };
 510
 511 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 512 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 513                                   struct cpufreq_frequency_table **table);
 514 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 515                                    struct cpufreq_frequency_table **table);
 516 #else
 517 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 518                                                 struct cpufreq_frequency_table
 519                                                 **table)
 520 {
 521         return -EINVAL;
 522 }
 523
 524 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 525                                                  struct cpufreq_frequency_table
 526                                                  **table)
 527 {
 528 }
 529 #endif
 530
 531 static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos)
 532 {
 533         while ((*pos)->frequency != CPUFREQ_TABLE_END)
 534                 if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID)
 535                         return true;
 536                 else
 537                         (*pos)++;
 538         return false;
 539 }
 540
 541 /*
 542  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 543  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 544  * @table:      the cpufreq_frequency_table * to iterate over.
 545  */
 546
 547 #define cpufreq_for_each_entry(pos, table)      \
 548         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 549
 550 /*
 551  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 552  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 553  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 554  * @table:      the cpufreq_frequency_table * to iterate over.
 555  */
 556
 557 #define cpufreq_for_each_valid_entry(pos, table)        \
 558         for (pos = table; cpufreq_next_valid(&pos); pos++)
 559
 560 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 561                                     struct cpufreq_frequency_table *table);
 562
 563 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 564                                    struct cpufreq_frequency_table *table);
 565 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
 566
 567 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 568                                    struct cpufreq_frequency_table *table,
 569                                    unsigned int target_freq,
 570                                    unsigned int relation,
 571                                    unsigned int *index);
 572 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 573                 unsigned int freq);
 574
 575 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 576
 577 #ifdef CONFIG_CPU_FREQ
 578 int cpufreq_boost_trigger_state(int state);
 579 int cpufreq_boost_supported(void);
 580 int cpufreq_boost_enabled(void);
 581 #else
 582 static inline int cpufreq_boost_trigger_state(int state)
 583 {
 584         return 0;
 585 }
 586 static inline int cpufreq_boost_supported(void)
 587 {
 588         return 0;
 589 }
 590 static inline int cpufreq_boost_enabled(void)
 591 {
 592         return 0;
 593 }
 594 #endif
 595 /* the following funtion is for cpufreq core use only */
 596 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
 597
 598 /* the following are really really optional */
 599 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
 600 extern struct freq_attr *cpufreq_generic_attr[];
 601 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
 602                                       struct cpufreq_frequency_table *table);
 603
 604 unsigned int cpufreq_generic_get(unsigned int cpu);
 605 int cpufreq_generic_init(struct cpufreq_policy *policy,
 606                 struct cpufreq_frequency_table *table,
 607                 unsigned int transition_latency);
 608 #endif /* _LINUX_CPUFREQ_H */