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 accommodating '\n' in prints */
  35 #define CPUFREQ_NAME_PLEN               (CPUFREQ_NAME_LEN + 1)
  36
  37 struct cpufreq_governor;
  38
  39 enum cpufreq_table_sorting {
  40         CPUFREQ_TABLE_UNSORTED,
  41         CPUFREQ_TABLE_SORTED_ASCENDING,
  42         CPUFREQ_TABLE_SORTED_DESCENDING
  43 };
  44
  45 struct cpufreq_freqs {
  46         unsigned int cpu;       /* cpu nr */
  47         unsigned int old;
  48         unsigned int new;
  49         u8 flags;               /* flags of cpufreq_driver, see below. */
  50 };
  51
  52 struct cpufreq_cpuinfo {
  53         unsigned int            max_freq;
  54         unsigned int            min_freq;
  55
  56         /* in 10^(-9) s = nanoseconds */
  57         unsigned int            transition_latency;
  58 };
  59
  60 struct cpufreq_user_policy {
  61         unsigned int            min;    /* in kHz */
  62         unsigned int            max;    /* in kHz */
  63 };
  64
  65 struct cpufreq_policy {
  66         /* CPUs sharing clock, require sw coordination */
  67         cpumask_var_t           cpus;   /* Online CPUs only */
  68         cpumask_var_t           related_cpus; /* Online + Offline CPUs */
  69         cpumask_var_t           real_cpus; /* Related and present */
  70
  71         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
  72                                                 should set cpufreq */
  73         unsigned int            cpu;    /* cpu managing this policy, must be online */
  74
  75         struct clk              *clk;
  76         struct cpufreq_cpuinfo  cpuinfo;/* see above */
  77
  78         unsigned int            min;    /* in kHz */
  79         unsigned int            max;    /* in kHz */
  80         unsigned int            cur;    /* in kHz, only needed if cpufreq
  81                                          * governors are used */
  82         unsigned int            restore_freq; /* = policy->cur before transition */
  83         unsigned int            suspend_freq; /* freq to set during suspend */
  84
  85         unsigned int            policy; /* see above */
  86         unsigned int            last_policy; /* policy before unplug */
  87         struct cpufreq_governor *governor; /* see below */
  88         void                    *governor_data;
  89         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
  90
  91         struct work_struct      update; /* if update_policy() needs to be
  92                                          * called, but you're in IRQ context */
  93
  94         struct cpufreq_user_policy user_policy;
  95         struct cpufreq_frequency_table  *freq_table;
  96         enum cpufreq_table_sorting freq_table_sorted;
  97
  98         struct list_head        policy_list;
  99         struct kobject          kobj;
 100         struct completion       kobj_unregister;
 101
 102         /*
 103          * The rules for this semaphore:
 104          * - Any routine that wants to read from the policy structure will
 105          *   do a down_read on this semaphore.
 106          * - Any routine that will write to the policy structure and/or may take away
 107          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
 108          *   mode before doing so.
 109          */
 110         struct rw_semaphore     rwsem;
 111
 112         /*
 113          * Fast switch flags:
 114          * - fast_switch_possible should be set by the driver if it can
 115          *   guarantee that frequency can be changed on any CPU sharing the
 116          *   policy and that the change will affect all of the policy CPUs then.
 117          * - fast_switch_enabled is to be set by governors that support fast
 118          *   frequency switching with the help of cpufreq_enable_fast_switch().
 119          */
 120         bool                    fast_switch_possible;
 121         bool                    fast_switch_enabled;
 122
 123         /*
 124          * Preferred average time interval between consecutive invocations of
 125          * the driver to set the frequency for this policy.  To be set by the
 126          * scaling driver (0, which is the default, means no preference).
 127          */
 128         unsigned int            transition_delay_us;
 129
 130         /*
 131          * Remote DVFS flag (Not added to the driver structure as we don't want
 132          * to access another structure from scheduler hotpath).
 133          *
 134          * Should be set if CPUs can do DVFS on behalf of other CPUs from
 135          * different cpufreq policies.
 136          */
 137         bool                    dvfs_possible_from_any_cpu;
 138
 139          /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
 140         unsigned int cached_target_freq;
 141         int cached_resolved_idx;
 142
 143         /* Synchronization for frequency transitions */
 144         bool                    transition_ongoing; /* Tracks transition status */
 145         spinlock_t              transition_lock;
 146         wait_queue_head_t       transition_wait;
 147         struct task_struct      *transition_task; /* Task which is doing the transition */
 148
 149         /* cpufreq-stats */
 150         struct cpufreq_stats    *stats;
 151
 152         /* For cpufreq driver's internal use */
 153         void                    *driver_data;
 154 };
 155
 156 /* Only for ACPI */
 157 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 158 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 159 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 160 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 161
 162 #ifdef CONFIG_CPU_FREQ
 163 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
 164 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 165 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 166 #else
 167 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 168 {
 169         return NULL;
 170 }
 171 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 172 {
 173         return NULL;
 174 }
 175 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 176 #endif
 177
 178 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 179 {
 180         return cpumask_weight(policy->cpus) > 1;
 181 }
 182
 183 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
 184 extern struct kobject *cpufreq_global_kobject;
 185
 186 #ifdef CONFIG_CPU_FREQ
 187 unsigned int cpufreq_get(unsigned int cpu);
 188 unsigned int cpufreq_quick_get(unsigned int cpu);
 189 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 190 void disable_cpufreq(void);
 191
 192 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 193 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 194 void cpufreq_update_policy(unsigned int cpu);
 195 bool have_governor_per_policy(void);
 196 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 197 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
 198 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
 199 #else
 200 static inline unsigned int cpufreq_get(unsigned int cpu)
 201 {
 202         return 0;
 203 }
 204 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 205 {
 206         return 0;
 207 }
 208 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 209 {
 210         return 0;
 211 }
 212 static inline void disable_cpufreq(void) { }
 213 #endif
 214
 215 #ifdef CONFIG_CPU_FREQ_STAT
 216 void cpufreq_stats_create_table(struct cpufreq_policy *policy);
 217 void cpufreq_stats_free_table(struct cpufreq_policy *policy);
 218 void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 219                                      unsigned int new_freq);
 220 #else
 221 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
 222 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
 223 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 224                                                    unsigned int new_freq) { }
 225 #endif /* CONFIG_CPU_FREQ_STAT */
 226
 227 /*********************************************************************
 228  *                      CPUFREQ DRIVER INTERFACE                     *
 229  *********************************************************************/
 230
 231 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 232 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 233 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 234
 235 struct freq_attr {
 236         struct attribute attr;
 237         ssize_t (*show)(struct cpufreq_policy *, char *);
 238         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 239 };
 240
 241 #define cpufreq_freq_attr_ro(_name)             \
 242 static struct freq_attr _name =                 \
 243 __ATTR(_name, 0444, show_##_name, NULL)
 244
 245 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 246 static struct freq_attr _name =                 \
 247 __ATTR(_name, _perm, show_##_name, NULL)
 248
 249 #define cpufreq_freq_attr_rw(_name)             \
 250 static struct freq_attr _name =                 \
 251 __ATTR(_name, 0644, show_##_name, store_##_name)
 252
 253 #define cpufreq_freq_attr_wo(_name)             \
 254 static struct freq_attr _name =                 \
 255 __ATTR(_name, 0200, NULL, store_##_name)
 256
 257 #define define_one_global_ro(_name)             \
 258 static struct kobj_attribute _name =            \
 259 __ATTR(_name, 0444, show_##_name, NULL)
 260
 261 #define define_one_global_rw(_name)             \
 262 static struct kobj_attribute _name =            \
 263 __ATTR(_name, 0644, show_##_name, store_##_name)
 264
 265
 266 struct cpufreq_driver {
 267         char            name[CPUFREQ_NAME_LEN];
 268         u8              flags;
 269         void            *driver_data;
 270
 271         /* needed by all drivers */
 272         int             (*init)(struct cpufreq_policy *policy);
 273         int             (*verify)(struct cpufreq_policy *policy);
 274
 275         /* define one out of two */
 276         int             (*setpolicy)(struct cpufreq_policy *policy);
 277
 278         /*
 279          * On failure, should always restore frequency to policy->restore_freq
 280          * (i.e. old freq).
 281          */
 282         int             (*target)(struct cpufreq_policy *policy,
 283                                   unsigned int target_freq,
 284                                   unsigned int relation);       /* Deprecated */
 285         int             (*target_index)(struct cpufreq_policy *policy,
 286                                         unsigned int index);
 287         unsigned int    (*fast_switch)(struct cpufreq_policy *policy,
 288                                        unsigned int target_freq);
 289
 290         /*
 291          * Caches and returns the lowest driver-supported frequency greater than
 292          * or equal to the target frequency, subject to any driver limitations.
 293          * Does not set the frequency. Only to be implemented for drivers with
 294          * target().
 295          */
 296         unsigned int    (*resolve_freq)(struct cpufreq_policy *policy,
 297                                         unsigned int target_freq);
 298
 299         /*
 300          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 301          * unset.
 302          *
 303          * get_intermediate should return a stable intermediate frequency
 304          * platform wants to switch to and target_intermediate() should set CPU
 305          * to to that frequency, before jumping to the frequency corresponding
 306          * to 'index'. Core will take care of sending notifications and driver
 307          * doesn't have to handle them in target_intermediate() or
 308          * target_index().
 309          *
 310          * Drivers can return '0' from get_intermediate() in case they don't
 311          * wish to switch to intermediate frequency for some target frequency.
 312          * In that case core will directly call ->target_index().
 313          */
 314         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 315                                             unsigned int index);
 316         int             (*target_intermediate)(struct cpufreq_policy *policy,
 317                                                unsigned int index);
 318
 319         /* should be defined, if possible */
 320         unsigned int    (*get)(unsigned int cpu);
 321
 322         /* optional */
 323         int             (*bios_limit)(int cpu, unsigned int *limit);
 324
 325         int             (*exit)(struct cpufreq_policy *policy);
 326         void            (*stop_cpu)(struct cpufreq_policy *policy);
 327         int             (*suspend)(struct cpufreq_policy *policy);
 328         int             (*resume)(struct cpufreq_policy *policy);
 329
 330         /* Will be called after the driver is fully initialized */
 331         void            (*ready)(struct cpufreq_policy *policy);
 332
 333         struct freq_attr **attr;
 334
 335         /* platform specific boost support code */
 336         bool            boost_enabled;
 337         int             (*set_boost)(int state);
 338 };
 339
 340 /* flags */
 341 #define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
 342                                                    all ->init() calls failed */
 343 #define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
 344                                                    kernel "constants" aren't
 345                                                    affected by frequency
 346                                                    transitions */
 347 #define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
 348                                                    speed mismatches */
 349
 350 /*
 351  * This should be set by platforms having multiple clock-domains, i.e.
 352  * supporting multiple policies. With this sysfs directories of governor would
 353  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 354  * governor with different tunables for different clusters.
 355  */
 356 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
 357
 358 /*
 359  * Driver will do POSTCHANGE notifications from outside of their ->target()
 360  * routine and so must set cpufreq_driver->flags with this flag, so that core
 361  * can handle them specially.
 362  */
 363 #define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
 364
 365 /*
 366  * Set by drivers which want cpufreq core to check if CPU is running at a
 367  * frequency present in freq-table exposed by the driver. For these drivers if
 368  * CPU is found running at an out of table freq, we will try to set it to a freq
 369  * from the table. And if that fails, we will stop further boot process by
 370  * issuing a BUG_ON().
 371  */
 372 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
 373
 374 /*
 375  * Set by drivers to disallow use of governors with "dynamic_switching" flag
 376  * set.
 377  */
 378 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING (1 << 6)
 379
 380 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 381 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 382
 383 const char *cpufreq_get_current_driver(void);
 384 void *cpufreq_get_driver_data(void);
 385
 386 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
 387                 unsigned int min, unsigned int max)
 388 {
 389         if (policy->min < min)
 390                 policy->min = min;
 391         if (policy->max < min)
 392                 policy->max = min;
 393         if (policy->min > max)
 394                 policy->min = max;
 395         if (policy->max > max)
 396                 policy->max = max;
 397         if (policy->min > policy->max)
 398                 policy->min = policy->max;
 399         return;
 400 }
 401
 402 static inline void
 403 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
 404 {
 405         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 406                         policy->cpuinfo.max_freq);
 407 }
 408
 409 #ifdef CONFIG_CPU_FREQ
 410 void cpufreq_suspend(void);
 411 void cpufreq_resume(void);
 412 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 413 #else
 414 static inline void cpufreq_suspend(void) {}
 415 static inline void cpufreq_resume(void) {}
 416 #endif
 417
 418 /*********************************************************************
 419  *                     CPUFREQ NOTIFIER INTERFACE                    *
 420  *********************************************************************/
 421
 422 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 423 #define CPUFREQ_POLICY_NOTIFIER         (1)
 424
 425 /* Transition notifiers */
 426 #define CPUFREQ_PRECHANGE               (0)
 427 #define CPUFREQ_POSTCHANGE              (1)
 428
 429 /* Policy Notifiers  */
 430 #define CPUFREQ_ADJUST                  (0)
 431 #define CPUFREQ_NOTIFY                  (1)
 432
 433 #ifdef CONFIG_CPU_FREQ
 434 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 435 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 436
 437 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 438                 struct cpufreq_freqs *freqs);
 439 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 440                 struct cpufreq_freqs *freqs, int transition_failed);
 441
 442 #else /* CONFIG_CPU_FREQ */
 443 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 444                                                 unsigned int list)
 445 {
 446         return 0;
 447 }
 448 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 449                                                 unsigned int list)
 450 {
 451         return 0;
 452 }
 453 #endif /* !CONFIG_CPU_FREQ */
 454
 455 /**
 456  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 457  * safe)
 458  * @old:   old value
 459  * @div:   divisor
 460  * @mult:  multiplier
 461  *
 462  *
 463  * new = old * mult / div
 464  */
 465 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 466                 u_int mult)
 467 {
 468 #if BITS_PER_LONG == 32
 469         u64 result = ((u64) old) * ((u64) mult);
 470         do_div(result, div);
 471         return (unsigned long) result;
 472
 473 #elif BITS_PER_LONG == 64
 474         unsigned long result = old * ((u64) mult);
 475         result /= div;
 476         return result;
 477 #endif
 478 }
 479
 480 /*********************************************************************
 481  *                          CPUFREQ GOVERNORS                        *
 482  *********************************************************************/
 483
 484 /*
 485  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 486  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 487  * two generic policies are available:
 488  */
 489 #define CPUFREQ_POLICY_POWERSAVE        (1)
 490 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 491
 492 /*
 493  * The polling frequency depends on the capability of the processor. Default
 494  * polling frequency is 1000 times the transition latency of the processor. The
 495  * ondemand governor will work on any processor with transition latency <= 10ms,
 496  * using appropriate sampling rate.
 497  */
 498 #define LATENCY_MULTIPLIER              (1000)
 499
 500 struct cpufreq_governor {
 501         char    name[CPUFREQ_NAME_LEN];
 502         int     (*init)(struct cpufreq_policy *policy);
 503         void    (*exit)(struct cpufreq_policy *policy);
 504         int     (*start)(struct cpufreq_policy *policy);
 505         void    (*stop)(struct cpufreq_policy *policy);
 506         void    (*limits)(struct cpufreq_policy *policy);
 507         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 508                                          char *buf);
 509         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 510                                          unsigned int freq);
 511         /* For governors which change frequency dynamically by themselves */
 512         bool                    dynamic_switching;
 513         struct list_head        governor_list;
 514         struct module           *owner;
 515 };
 516
 517 /* Pass a target to the cpufreq driver */
 518 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 519                                         unsigned int target_freq);
 520 int cpufreq_driver_target(struct cpufreq_policy *policy,
 521                                  unsigned int target_freq,
 522                                  unsigned int relation);
 523 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 524                                    unsigned int target_freq,
 525                                    unsigned int relation);
 526 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
 527                                          unsigned int target_freq);
 528 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
 529 int cpufreq_register_governor(struct cpufreq_governor *governor);
 530 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 531
 532 struct cpufreq_governor *cpufreq_default_governor(void);
 533 struct cpufreq_governor *cpufreq_fallback_governor(void);
 534
 535 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
 536 {
 537         if (policy->max < policy->cur)
 538                 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
 539         else if (policy->min > policy->cur)
 540                 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
 541 }
 542
 543 /* Governor attribute set */
 544 struct gov_attr_set {
 545         struct kobject kobj;
 546         struct list_head policy_list;
 547         struct mutex update_lock;
 548         int usage_count;
 549 };
 550
 551 /* sysfs ops for cpufreq governors */
 552 extern const struct sysfs_ops governor_sysfs_ops;
 553
 554 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
 555 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
 556 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
 557
 558 /* Governor sysfs attribute */
 559 struct governor_attr {
 560         struct attribute attr;
 561         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
 562         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
 563                          size_t count);
 564 };
 565
 566 /*********************************************************************
 567  *                     FREQUENCY TABLE HELPERS                       *
 568  *********************************************************************/
 569
 570 /* Special Values of .frequency field */
 571 #define CPUFREQ_ENTRY_INVALID   ~0u
 572 #define CPUFREQ_TABLE_END       ~1u
 573 /* Special Values of .flags field */
 574 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 575
 576 struct cpufreq_frequency_table {
 577         unsigned int    flags;
 578         unsigned int    driver_data; /* driver specific data, not used by core */
 579         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 580                                     * order */
 581 };
 582
 583 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 584 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 585                                   struct cpufreq_frequency_table **table);
 586 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 587                                    struct cpufreq_frequency_table **table);
 588 #else
 589 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 590                                                 struct cpufreq_frequency_table
 591                                                 **table)
 592 {
 593         return -EINVAL;
 594 }
 595
 596 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 597                                                  struct cpufreq_frequency_table
 598                                                  **table)
 599 {
 600 }
 601 #endif
 602
 603 /*
 604  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 605  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 606  * @table:      the cpufreq_frequency_table * to iterate over.
 607  */
 608
 609 #define cpufreq_for_each_entry(pos, table)      \
 610         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 611
 612 /*
 613  * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
 614  *      with index
 615  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 616  * @table:      the cpufreq_frequency_table * to iterate over.
 617  * @idx:        the table entry currently being processed
 618  */
 619
 620 #define cpufreq_for_each_entry_idx(pos, table, idx)     \
 621         for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
 622                 pos++, idx++)
 623
 624 /*
 625  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 626  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 627  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 628  * @table:      the cpufreq_frequency_table * to iterate over.
 629  */
 630
 631 #define cpufreq_for_each_valid_entry(pos, table)                        \
 632         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
 633                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 634                         continue;                                       \
 635                 else
 636
 637 /*
 638  * cpufreq_for_each_valid_entry_idx -     iterate with index over a cpufreq
 639  *      frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
 640  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 641  * @table:      the cpufreq_frequency_table * to iterate over.
 642  * @idx:        the table entry currently being processed
 643  */
 644
 645 #define cpufreq_for_each_valid_entry_idx(pos, table, idx)               \
 646         cpufreq_for_each_entry_idx(pos, table, idx)                     \
 647                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 648                         continue;                                       \
 649                 else
 650
 651
 652 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 653                                     struct cpufreq_frequency_table *table);
 654
 655 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 656                                    struct cpufreq_frequency_table *table);
 657 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
 658
 659 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
 660                                  unsigned int target_freq,
 661                                  unsigned int relation);
 662 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 663                 unsigned int freq);
 664
 665 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 666
 667 #ifdef CONFIG_CPU_FREQ
 668 int cpufreq_boost_trigger_state(int state);
 669 int cpufreq_boost_enabled(void);
 670 int cpufreq_enable_boost_support(void);
 671 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 672
 673 /* Find lowest freq at or above target in a table in ascending order */
 674 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
 675                                               unsigned int target_freq)
 676 {
 677         struct cpufreq_frequency_table *table = policy->freq_table;
 678         struct cpufreq_frequency_table *pos;
 679         unsigned int freq;
 680         int idx, best = -1;
 681
 682         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 683                 freq = pos->frequency;
 684
 685                 if (freq >= target_freq)
 686                         return idx;
 687
 688                 best = idx;
 689         }
 690
 691         return best;
 692 }
 693
 694 /* Find lowest freq at or above target in a table in descending order */
 695 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
 696                                               unsigned int target_freq)
 697 {
 698         struct cpufreq_frequency_table *table = policy->freq_table;
 699         struct cpufreq_frequency_table *pos;
 700         unsigned int freq;
 701         int idx, best = -1;
 702
 703         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 704                 freq = pos->frequency;
 705
 706                 if (freq == target_freq)
 707                         return idx;
 708
 709                 if (freq > target_freq) {
 710                         best = idx;
 711                         continue;
 712                 }
 713
 714                 /* No freq found above target_freq */
 715                 if (best == -1)
 716                         return idx;
 717
 718                 return best;
 719         }
 720
 721         return best;
 722 }
 723
 724 /* Works only on sorted freq-tables */
 725 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
 726                                              unsigned int target_freq)
 727 {
 728         target_freq = clamp_val(target_freq, policy->min, policy->max);
 729
 730         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 731                 return cpufreq_table_find_index_al(policy, target_freq);
 732         else
 733                 return cpufreq_table_find_index_dl(policy, target_freq);
 734 }
 735
 736 /* Find highest freq at or below target in a table in ascending order */
 737 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
 738                                               unsigned int target_freq)
 739 {
 740         struct cpufreq_frequency_table *table = policy->freq_table;
 741         struct cpufreq_frequency_table *pos;
 742         unsigned int freq;
 743         int idx, best = -1;
 744
 745         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 746                 freq = pos->frequency;
 747
 748                 if (freq == target_freq)
 749                         return idx;
 750
 751                 if (freq < target_freq) {
 752                         best = idx;
 753                         continue;
 754                 }
 755
 756                 /* No freq found below target_freq */
 757                 if (best == -1)
 758                         return idx;
 759
 760                 return best;
 761         }
 762
 763         return best;
 764 }
 765
 766 /* Find highest freq at or below target in a table in descending order */
 767 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
 768                                               unsigned int target_freq)
 769 {
 770         struct cpufreq_frequency_table *table = policy->freq_table;
 771         struct cpufreq_frequency_table *pos;
 772         unsigned int freq;
 773         int idx, best = -1;
 774
 775         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 776                 freq = pos->frequency;
 777
 778                 if (freq <= target_freq)
 779                         return idx;
 780
 781                 best = idx;
 782         }
 783
 784         return best;
 785 }
 786
 787 /* Works only on sorted freq-tables */
 788 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
 789                                              unsigned int target_freq)
 790 {
 791         target_freq = clamp_val(target_freq, policy->min, policy->max);
 792
 793         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 794                 return cpufreq_table_find_index_ah(policy, target_freq);
 795         else
 796                 return cpufreq_table_find_index_dh(policy, target_freq);
 797 }
 798
 799 /* Find closest freq to target in a table in ascending order */
 800 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
 801                                               unsigned int target_freq)
 802 {
 803         struct cpufreq_frequency_table *table = policy->freq_table;
 804         struct cpufreq_frequency_table *pos;
 805         unsigned int freq;
 806         int idx, best = -1;
 807
 808         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 809                 freq = pos->frequency;
 810
 811                 if (freq == target_freq)
 812                         return idx;
 813
 814                 if (freq < target_freq) {
 815                         best = idx;
 816                         continue;
 817                 }
 818
 819                 /* No freq found below target_freq */
 820                 if (best == -1)
 821                         return idx;
 822
 823                 /* Choose the closest freq */
 824                 if (target_freq - table[best].frequency > freq - target_freq)
 825                         return idx;
 826
 827                 return best;
 828         }
 829
 830         return best;
 831 }
 832
 833 /* Find closest freq to target in a table in descending order */
 834 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
 835                                               unsigned int target_freq)
 836 {
 837         struct cpufreq_frequency_table *table = policy->freq_table;
 838         struct cpufreq_frequency_table *pos;
 839         unsigned int freq;
 840         int idx, best = -1;
 841
 842         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 843                 freq = pos->frequency;
 844
 845                 if (freq == target_freq)
 846                         return idx;
 847
 848                 if (freq > target_freq) {
 849                         best = idx;
 850                         continue;
 851                 }
 852
 853                 /* No freq found above target_freq */
 854                 if (best == -1)
 855                         return idx;
 856
 857                 /* Choose the closest freq */
 858                 if (table[best].frequency - target_freq > target_freq - freq)
 859                         return idx;
 860
 861                 return best;
 862         }
 863
 864         return best;
 865 }
 866
 867 /* Works only on sorted freq-tables */
 868 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
 869                                              unsigned int target_freq)
 870 {
 871         target_freq = clamp_val(target_freq, policy->min, policy->max);
 872
 873         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 874                 return cpufreq_table_find_index_ac(policy, target_freq);
 875         else
 876                 return cpufreq_table_find_index_dc(policy, target_freq);
 877 }
 878
 879 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 880                                                  unsigned int target_freq,
 881                                                  unsigned int relation)
 882 {
 883         if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
 884                 return cpufreq_table_index_unsorted(policy, target_freq,
 885                                                     relation);
 886
 887         switch (relation) {
 888         case CPUFREQ_RELATION_L:
 889                 return cpufreq_table_find_index_l(policy, target_freq);
 890         case CPUFREQ_RELATION_H:
 891                 return cpufreq_table_find_index_h(policy, target_freq);
 892         case CPUFREQ_RELATION_C:
 893                 return cpufreq_table_find_index_c(policy, target_freq);
 894         default:
 895                 pr_err("%s: Invalid relation: %d\n", __func__, relation);
 896                 return -EINVAL;
 897         }
 898 }
 899
 900 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
 901 {
 902         struct cpufreq_frequency_table *pos;
 903         int count = 0;
 904
 905         if (unlikely(!policy->freq_table))
 906                 return 0;
 907
 908         cpufreq_for_each_valid_entry(pos, policy->freq_table)
 909                 count++;
 910
 911         return count;
 912 }
 913 #else
 914 static inline int cpufreq_boost_trigger_state(int state)
 915 {
 916         return 0;
 917 }
 918 static inline int cpufreq_boost_enabled(void)
 919 {
 920         return 0;
 921 }
 922
 923 static inline int cpufreq_enable_boost_support(void)
 924 {
 925         return -EINVAL;
 926 }
 927
 928 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
 929 {
 930         return false;
 931 }
 932 #endif
 933
 934 extern void arch_freq_prepare_all(void);
 935 extern unsigned int arch_freq_get_on_cpu(int cpu);
 936
 937 extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
 938                                 unsigned long max_freq);
 939
 940 /* the following are really really optional */
 941 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
 942 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
 943 extern struct freq_attr *cpufreq_generic_attr[];
 944 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
 945
 946 unsigned int cpufreq_generic_get(unsigned int cpu);
 947 int cpufreq_generic_init(struct cpufreq_policy *policy,
 948                 struct cpufreq_frequency_table *table,
 949                 unsigned int transition_latency);
 950 #endif /* _LINUX_CPUFREQ_H */