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
  66         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
  67                                                 should set cpufreq */
  68         unsigned int            cpu;    /* cpu nr of CPU managing this policy */
  69         struct clk              *clk;
  70         struct cpufreq_cpuinfo  cpuinfo;/* see above */
  71
  72         unsigned int            min;    /* in kHz */
  73         unsigned int            max;    /* in kHz */
  74         unsigned int            cur;    /* in kHz, only needed if cpufreq
  75                                          * governors are used */
  76         unsigned int            restore_freq; /* = policy->cur before transition */
  77         unsigned int            suspend_freq; /* freq to set during suspend */
  78
  79         unsigned int            policy; /* see above */
  80         struct cpufreq_governor *governor; /* see below */
  81         void                    *governor_data;
  82         bool                    governor_enabled; /* governor start/stop flag */
  83
  84         struct work_struct      update; /* if update_policy() needs to be
  85                                          * called, but you're in IRQ context */
  86
  87         struct cpufreq_real_policy      user_policy;
  88         struct cpufreq_frequency_table  *freq_table;
  89
  90         struct list_head        policy_list;
  91         struct kobject          kobj;
  92         struct completion       kobj_unregister;
  93
  94         /*
  95          * The rules for this semaphore:
  96          * - Any routine that wants to read from the policy structure will
  97          *   do a down_read on this semaphore.
  98          * - Any routine that will write to the policy structure and/or may take away
  99          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
 100          *   mode before doing so.
 101          *
 102          * Additional rules:
 103          * - Lock should not be held across
 104          *     __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT);
 105          */
 106         struct rw_semaphore     rwsem;
 107
 108         /* Synchronization for frequency transitions */
 109         bool                    transition_ongoing; /* Tracks transition status */
 110         spinlock_t              transition_lock;
 111         wait_queue_head_t       transition_wait;
 112         struct task_struct      *transition_task; /* Task which is doing the transition */
 113
 114         /* cpufreq-stats */
 115         struct cpufreq_stats    *stats;
 116
 117         /* For cpufreq driver's internal use */
 118         void                    *driver_data;
 119 };
 120
 121 /* Only for ACPI */
 122 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 123 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 124 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 125 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 126
 127 #ifdef CONFIG_CPU_FREQ
 128 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 129 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 130 #else
 131 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 132 {
 133         return NULL;
 134 }
 135 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 136 #endif
 137
 138 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 139 {
 140         return cpumask_weight(policy->cpus) > 1;
 141 }
 142
 143 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
 144 extern struct kobject *cpufreq_global_kobject;
 145 int cpufreq_get_global_kobject(void);
 146 void cpufreq_put_global_kobject(void);
 147 int cpufreq_sysfs_create_file(const struct attribute *attr);
 148 void cpufreq_sysfs_remove_file(const struct attribute *attr);
 149
 150 #ifdef CONFIG_CPU_FREQ
 151 unsigned int cpufreq_get(unsigned int cpu);
 152 unsigned int cpufreq_quick_get(unsigned int cpu);
 153 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 154 void disable_cpufreq(void);
 155
 156 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 157 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 158 int cpufreq_update_policy(unsigned int cpu);
 159 bool have_governor_per_policy(void);
 160 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 161 #else
 162 static inline unsigned int cpufreq_get(unsigned int cpu)
 163 {
 164         return 0;
 165 }
 166 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 167 {
 168         return 0;
 169 }
 170 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 171 {
 172         return 0;
 173 }
 174 static inline void disable_cpufreq(void) { }
 175 #endif
 176
 177 /*********************************************************************
 178  *                      CPUFREQ DRIVER INTERFACE                     *
 179  *********************************************************************/
 180
 181 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 182 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 183 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 184
 185 struct freq_attr {
 186         struct attribute attr;
 187         ssize_t (*show)(struct cpufreq_policy *, char *);
 188         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 189 };
 190
 191 #define cpufreq_freq_attr_ro(_name)             \
 192 static struct freq_attr _name =                 \
 193 __ATTR(_name, 0444, show_##_name, NULL)
 194
 195 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 196 static struct freq_attr _name =                 \
 197 __ATTR(_name, _perm, show_##_name, NULL)
 198
 199 #define cpufreq_freq_attr_rw(_name)             \
 200 static struct freq_attr _name =                 \
 201 __ATTR(_name, 0644, show_##_name, store_##_name)
 202
 203 struct global_attr {
 204         struct attribute attr;
 205         ssize_t (*show)(struct kobject *kobj,
 206                         struct attribute *attr, char *buf);
 207         ssize_t (*store)(struct kobject *a, struct attribute *b,
 208                          const char *c, size_t count);
 209 };
 210
 211 #define define_one_global_ro(_name)             \
 212 static struct global_attr _name =               \
 213 __ATTR(_name, 0444, show_##_name, NULL)
 214
 215 #define define_one_global_rw(_name)             \
 216 static struct global_attr _name =               \
 217 __ATTR(_name, 0644, show_##_name, store_##_name)
 218
 219
 220 struct cpufreq_driver {
 221         char            name[CPUFREQ_NAME_LEN];
 222         u8              flags;
 223         void            *driver_data;
 224
 225         /* needed by all drivers */
 226         int             (*init)(struct cpufreq_policy *policy);
 227         int             (*verify)(struct cpufreq_policy *policy);
 228
 229         /* define one out of two */
 230         int             (*setpolicy)(struct cpufreq_policy *policy);
 231
 232         /*
 233          * On failure, should always restore frequency to policy->restore_freq
 234          * (i.e. old freq).
 235          */
 236         int             (*target)(struct cpufreq_policy *policy,
 237                                   unsigned int target_freq,
 238                                   unsigned int relation);       /* Deprecated */
 239         int             (*target_index)(struct cpufreq_policy *policy,
 240                                         unsigned int index);
 241         /*
 242          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 243          * unset.
 244          *
 245          * get_intermediate should return a stable intermediate frequency
 246          * platform wants to switch to and target_intermediate() should set CPU
 247          * to to that frequency, before jumping to the frequency corresponding
 248          * to 'index'. Core will take care of sending notifications and driver
 249          * doesn't have to handle them in target_intermediate() or
 250          * target_index().
 251          *
 252          * Drivers can return '0' from get_intermediate() in case they don't
 253          * wish to switch to intermediate frequency for some target frequency.
 254          * In that case core will directly call ->target_index().
 255          */
 256         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 257                                             unsigned int index);
 258         int             (*target_intermediate)(struct cpufreq_policy *policy,
 259                                                unsigned int index);
 260
 261         /* should be defined, if possible */
 262         unsigned int    (*get)(unsigned int cpu);
 263
 264         /* optional */
 265         int             (*bios_limit)(int cpu, unsigned int *limit);
 266
 267         int             (*exit)(struct cpufreq_policy *policy);
 268         void            (*stop_cpu)(struct cpufreq_policy *policy);
 269         int             (*suspend)(struct cpufreq_policy *policy);
 270         int             (*resume)(struct cpufreq_policy *policy);
 271
 272         /* Will be called after the driver is fully initialized */
 273         void            (*ready)(struct cpufreq_policy *policy);
 274
 275         struct freq_attr **attr;
 276
 277         /* platform specific boost support code */
 278         bool            boost_supported;
 279         bool            boost_enabled;
 280         int             (*set_boost)(int state);
 281 };
 282
 283 /* flags */
 284 #define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
 285                                                    all ->init() calls failed */
 286 #define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
 287                                                    kernel "constants" aren't
 288                                                    affected by frequency
 289                                                    transitions */
 290 #define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
 291                                                    speed mismatches */
 292
 293 /*
 294  * This should be set by platforms having multiple clock-domains, i.e.
 295  * supporting multiple policies. With this sysfs directories of governor would
 296  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 297  * governor with different tunables for different clusters.
 298  */
 299 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
 300
 301 /*
 302  * Driver will do POSTCHANGE notifications from outside of their ->target()
 303  * routine and so must set cpufreq_driver->flags with this flag, so that core
 304  * can handle them specially.
 305  */
 306 #define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
 307
 308 /*
 309  * Set by drivers which want cpufreq core to check if CPU is running at a
 310  * frequency present in freq-table exposed by the driver. For these drivers if
 311  * CPU is found running at an out of table freq, we will try to set it to a freq
 312  * from the table. And if that fails, we will stop further boot process by
 313  * issuing a BUG_ON().
 314  */
 315 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
 316
 317 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 318 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 319
 320 const char *cpufreq_get_current_driver(void);
 321 void *cpufreq_get_driver_data(void);
 322
 323 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
 324                 unsigned int min, unsigned int max)
 325 {
 326         if (policy->min < min)
 327                 policy->min = min;
 328         if (policy->max < min)
 329                 policy->max = min;
 330         if (policy->min > max)
 331                 policy->min = max;
 332         if (policy->max > max)
 333                 policy->max = max;
 334         if (policy->min > policy->max)
 335                 policy->min = policy->max;
 336         return;
 337 }
 338
 339 static inline void
 340 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
 341 {
 342         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 343                         policy->cpuinfo.max_freq);
 344 }
 345
 346 #ifdef CONFIG_CPU_FREQ
 347 void cpufreq_suspend(void);
 348 void cpufreq_resume(void);
 349 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 350 #else
 351 static inline void cpufreq_suspend(void) {}
 352 static inline void cpufreq_resume(void) {}
 353 #endif
 354
 355 /*********************************************************************
 356  *                     CPUFREQ NOTIFIER INTERFACE                    *
 357  *********************************************************************/
 358
 359 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 360 #define CPUFREQ_POLICY_NOTIFIER         (1)
 361
 362 /* Transition notifiers */
 363 #define CPUFREQ_PRECHANGE               (0)
 364 #define CPUFREQ_POSTCHANGE              (1)
 365
 366 /* Policy Notifiers  */
 367 #define CPUFREQ_ADJUST                  (0)
 368 #define CPUFREQ_INCOMPATIBLE            (1)
 369 #define CPUFREQ_NOTIFY                  (2)
 370 #define CPUFREQ_START                   (3)
 371 #define CPUFREQ_CREATE_POLICY           (4)
 372 #define CPUFREQ_REMOVE_POLICY           (5)
 373
 374 #ifdef CONFIG_CPU_FREQ
 375 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 376 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 377
 378 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 379                 struct cpufreq_freqs *freqs);
 380 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 381                 struct cpufreq_freqs *freqs, int transition_failed);
 382
 383 #else /* CONFIG_CPU_FREQ */
 384 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 385                                                 unsigned int list)
 386 {
 387         return 0;
 388 }
 389 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 390                                                 unsigned int list)
 391 {
 392         return 0;
 393 }
 394 #endif /* !CONFIG_CPU_FREQ */
 395
 396 /**
 397  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 398  * safe)
 399  * @old:   old value
 400  * @div:   divisor
 401  * @mult:  multiplier
 402  *
 403  *
 404  * new = old * mult / div
 405  */
 406 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 407                 u_int mult)
 408 {
 409 #if BITS_PER_LONG == 32
 410         u64 result = ((u64) old) * ((u64) mult);
 411         do_div(result, div);
 412         return (unsigned long) result;
 413
 414 #elif BITS_PER_LONG == 64
 415         unsigned long result = old * ((u64) mult);
 416         result /= div;
 417         return result;
 418 #endif
 419 }
 420
 421 /*********************************************************************
 422  *                          CPUFREQ GOVERNORS                        *
 423  *********************************************************************/
 424
 425 /*
 426  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 427  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 428  * two generic policies are available:
 429  */
 430 #define CPUFREQ_POLICY_POWERSAVE        (1)
 431 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 432
 433 /* Governor Events */
 434 #define CPUFREQ_GOV_START       1
 435 #define CPUFREQ_GOV_STOP        2
 436 #define CPUFREQ_GOV_LIMITS      3
 437 #define CPUFREQ_GOV_POLICY_INIT 4
 438 #define CPUFREQ_GOV_POLICY_EXIT 5
 439
 440 struct cpufreq_governor {
 441         char    name[CPUFREQ_NAME_LEN];
 442         int     initialized;
 443         int     (*governor)     (struct cpufreq_policy *policy,
 444                                  unsigned int event);
 445         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 446                                          char *buf);
 447         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 448                                          unsigned int freq);
 449         unsigned int max_transition_latency; /* HW must be able to switch to
 450                         next freq faster than this value in nano secs or we
 451                         will fallback to performance governor */
 452         struct list_head        governor_list;
 453         struct module           *owner;
 454 };
 455
 456 /* Pass a target to the cpufreq driver */
 457 int cpufreq_driver_target(struct cpufreq_policy *policy,
 458                                  unsigned int target_freq,
 459                                  unsigned int relation);
 460 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 461                                    unsigned int target_freq,
 462                                    unsigned int relation);
 463 int cpufreq_register_governor(struct cpufreq_governor *governor);
 464 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 465
 466 /* CPUFREQ DEFAULT GOVERNOR */
 467 /*
 468  * Performance governor is fallback governor if any other gov failed to auto
 469  * load due latency restrictions
 470  */
 471 #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
 472 extern struct cpufreq_governor cpufreq_gov_performance;
 473 #endif
 474 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 475 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_performance)
 476 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
 477 extern struct cpufreq_governor cpufreq_gov_powersave;
 478 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_powersave)
 479 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
 480 extern struct cpufreq_governor cpufreq_gov_userspace;
 481 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_userspace)
 482 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
 483 extern struct cpufreq_governor cpufreq_gov_ondemand;
 484 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_ondemand)
 485 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
 486 extern struct cpufreq_governor cpufreq_gov_conservative;
 487 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_conservative)
 488 #endif
 489
 490 /*********************************************************************
 491  *                     FREQUENCY TABLE HELPERS                       *
 492  *********************************************************************/
 493
 494 /* Special Values of .frequency field */
 495 #define CPUFREQ_ENTRY_INVALID   ~0u
 496 #define CPUFREQ_TABLE_END       ~1u
 497 /* Special Values of .flags field */
 498 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 499
 500 struct cpufreq_frequency_table {
 501         unsigned int    flags;
 502         unsigned int    driver_data; /* driver specific data, not used by core */
 503         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 504                                     * order */
 505 };
 506
 507 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 508 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 509                                   struct cpufreq_frequency_table **table);
 510 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 511                                    struct cpufreq_frequency_table **table);
 512 #else
 513 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 514                                                 struct cpufreq_frequency_table
 515                                                 **table)
 516 {
 517         return -EINVAL;
 518 }
 519
 520 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 521                                                  struct cpufreq_frequency_table
 522                                                  **table)
 523 {
 524 }
 525 #endif
 526
 527 static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos)
 528 {
 529         while ((*pos)->frequency != CPUFREQ_TABLE_END)
 530                 if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID)
 531                         return true;
 532                 else
 533                         (*pos)++;
 534         return false;
 535 }
 536
 537 /*
 538  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 539  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 540  * @table:      the cpufreq_frequency_table * to iterate over.
 541  */
 542
 543 #define cpufreq_for_each_entry(pos, table)      \
 544         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 545
 546 /*
 547  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 548  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 549  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 550  * @table:      the cpufreq_frequency_table * to iterate over.
 551  */
 552
 553 #define cpufreq_for_each_valid_entry(pos, table)        \
 554         for (pos = table; cpufreq_next_valid(&pos); pos++)
 555
 556 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 557                                     struct cpufreq_frequency_table *table);
 558
 559 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 560                                    struct cpufreq_frequency_table *table);
 561 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
 562
 563 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 564                                    struct cpufreq_frequency_table *table,
 565                                    unsigned int target_freq,
 566                                    unsigned int relation,
 567                                    unsigned int *index);
 568 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 569                 unsigned int freq);
 570
 571 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 572
 573 #ifdef CONFIG_CPU_FREQ
 574 int cpufreq_boost_trigger_state(int state);
 575 int cpufreq_boost_supported(void);
 576 int cpufreq_boost_enabled(void);
 577 #else
 578 static inline int cpufreq_boost_trigger_state(int state)
 579 {
 580         return 0;
 581 }
 582 static inline int cpufreq_boost_supported(void)
 583 {
 584         return 0;
 585 }
 586 static inline int cpufreq_boost_enabled(void)
 587 {
 588         return 0;
 589 }
 590 #endif
 591 /* the following funtion is for cpufreq core use only */
 592 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
 593
 594 /* the following are really really optional */
 595 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
 596 extern struct freq_attr *cpufreq_generic_attr[];
 597 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
 598                                       struct cpufreq_frequency_table *table);
 599
 600 unsigned int cpufreq_generic_get(unsigned int cpu);
 601 int cpufreq_generic_init(struct cpufreq_policy *policy,
 602                 struct cpufreq_frequency_table *table,
 603                 unsigned int transition_latency);
 604 #endif /* _LINUX_CPUFREQ_H */