LXR linux/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
  37struct cpufreq_governor;
  38
  39struct 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
  46struct 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
  54struct 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
  61struct 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
 128struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 129void cpufreq_cpu_put(struct cpufreq_policy *policy);
 130#else
 131static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 132{
 133        return NULL;
 134}
 135static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 136#endif
 137
 138static 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 */
 144extern struct kobject *cpufreq_global_kobject;
 145int cpufreq_get_global_kobject(void);
 146void cpufreq_put_global_kobject(void);
 147int cpufreq_sysfs_create_file(const struct attribute *attr);
 148void cpufreq_sysfs_remove_file(const struct attribute *attr);
 149
 150#ifdef CONFIG_CPU_FREQ
 151unsigned int cpufreq_get(unsigned int cpu);
 152unsigned int cpufreq_quick_get(unsigned int cpu);
 153unsigned int cpufreq_quick_get_max(unsigned int cpu);
 154void disable_cpufreq(void);
 155
 156u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 157int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 158int cpufreq_update_policy(unsigned int cpu);
 159bool have_governor_per_policy(void);
 160struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 161#else
 162static inline unsigned int cpufreq_get(unsigned int cpu)
 163{
 164        return 0;
 165}
 166static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 167{
 168        return 0;
 169}
 170static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 171{
 172        return 0;
 173}
 174static 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
 185struct 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)             \
 192static struct freq_attr _name =                 \
 193__ATTR(_name, 0444, show_##_name, NULL)
 194
 195#define cpufreq_freq_attr_ro_perm(_name, _perm) \
 196static struct freq_attr _name =                 \
 197__ATTR(_name, _perm, show_##_name, NULL)
 198
 199#define cpufreq_freq_attr_rw(_name)             \
 200static struct freq_attr _name =                 \
 201__ATTR(_name, 0644, show_##_name, store_##_name)
 202
 203struct 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)             \
 212static struct global_attr _name =               \
 213__ATTR(_name, 0444, show_##_name, NULL)
 214
 215#define define_one_global_rw(_name)             \
 216static struct global_attr _name =               \
 217__ATTR(_name, 0644, show_##_name, store_##_name)
 218
 219
 220struct 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
 317int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 318int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 319
 320const char *cpufreq_get_current_driver(void);
 321void *cpufreq_get_driver_data(void);
 322
 323static 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
 339static inline void
 340cpufreq_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
 347void cpufreq_suspend(void);
 348void cpufreq_resume(void);
 349int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 350#else
 351static inline void cpufreq_suspend(void) {}
 352static 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
 375int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 376int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 377
 378void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 379                struct cpufreq_freqs *freqs);
 380void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 381                struct cpufreq_freqs *freqs, int transition_failed);
 382
 383#else /* CONFIG_CPU_FREQ */
 384static inline int cpufreq_register_notifier(struct notifier_block *nb,
 385                                                unsigned int list)
 386{
 387        return 0;
 388}
 389static 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 */
 406static 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
 440struct 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 */
 457int cpufreq_driver_target(struct cpufreq_policy *policy,
 458                                 unsigned int target_freq,
 459                                 unsigned int relation);
 460int __cpufreq_driver_target(struct cpufreq_policy *policy,
 461                                   unsigned int target_freq,
 462                                   unsigned int relation);
 463int cpufreq_register_governor(struct cpufreq_governor *governor);
 464void 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
 472extern 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)
 477extern struct cpufreq_governor cpufreq_gov_powersave;
 478#define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_powersave)
 479#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
 480extern struct cpufreq_governor cpufreq_gov_userspace;
 481#define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_userspace)
 482#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
 483extern struct cpufreq_governor cpufreq_gov_ondemand;
 484#define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_ondemand)
 485#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
 486extern 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
 500struct 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)
 508int dev_pm_opp_init_cpufreq_table(struct device *dev,
 509                                  struct cpufreq_frequency_table **table);
 510void dev_pm_opp_free_cpufreq_table(struct device *dev,
 511                                   struct cpufreq_frequency_table **table);
 512#else
 513static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 514                                                struct cpufreq_frequency_table
 515                                                **table)
 516{
 517        return -EINVAL;
 518}
 519
 520static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 521                                                 struct cpufreq_frequency_table
 522                                                 **table)
 523{
 524}
 525#endif
 526
 527static 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
 556int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 557                                    struct cpufreq_frequency_table *table);
 558
 559int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 560                                   struct cpufreq_frequency_table *table);
 561int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
 562
 563int 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);
 568int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 569                unsigned int freq);
 570
 571ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 572
 573#ifdef CONFIG_CPU_FREQ
 574int cpufreq_boost_trigger_state(int state);
 575int cpufreq_boost_supported(void);
 576int cpufreq_boost_enabled(void);
 577#else
 578static inline int cpufreq_boost_trigger_state(int state)
 579{
 580        return 0;
 581}
 582static inline int cpufreq_boost_supported(void)
 583{
 584        return 0;
 585}
 586static inline int cpufreq_boost_enabled(void)
 587{
 588        return 0;
 589}
 590#endif
 591/* the following funtion is for cpufreq core use only */
 592struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
 593
 594/* the following are really really optional */
 595extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
 596extern struct freq_attr *cpufreq_generic_attr[];
 597int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
 598                                      struct cpufreq_frequency_table *table);
 599
 600unsigned int cpufreq_generic_get(unsigned int cpu);
 601int cpufreq_generic_init(struct cpufreq_policy *policy,
 602                struct cpufreq_frequency_table *table,
 603                unsigned int transition_latency);
 604#endif /* _LINUX_CPUFREQ_H */
 605