| 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_user_policy { |
| 55 | unsigned int min; /* in kHz */ |
| 56 | unsigned int max; /* in kHz */ |
| 57 | }; |
| 58 | |
| 59 | struct cpufreq_policy { |
| 60 | /* CPUs sharing clock, require sw coordination */ |
| 61 | cpumask_var_t cpus; /* Online CPUs only */ |
| 62 | cpumask_var_t related_cpus; /* Online + Offline CPUs */ |
| 63 | cpumask_var_t real_cpus; /* Related and present */ |
| 64 | |
| 65 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
| 66 | should set cpufreq */ |
| 67 | unsigned int cpu; /* cpu managing this policy, must be online */ |
| 68 | |
| 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 | unsigned int last_policy; /* policy before unplug */ |
| 81 | struct cpufreq_governor *governor; /* see below */ |
| 82 | void *governor_data; |
| 83 | bool governor_enabled; /* governor start/stop flag */ |
| 84 | char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */ |
| 85 | |
| 86 | struct work_struct update; /* if update_policy() needs to be |
| 87 | * called, but you're in IRQ context */ |
| 88 | |
| 89 | struct cpufreq_user_policy user_policy; |
| 90 | struct cpufreq_frequency_table *freq_table; |
| 91 | |
| 92 | struct list_head policy_list; |
| 93 | struct kobject kobj; |
| 94 | struct completion kobj_unregister; |
| 95 | |
| 96 | /* |
| 97 | * The rules for this semaphore: |
| 98 | * - Any routine that wants to read from the policy structure will |
| 99 | * do a down_read on this semaphore. |
| 100 | * - Any routine that will write to the policy structure and/or may take away |
| 101 | * the policy altogether (eg. CPU hotplug), will hold this lock in write |
| 102 | * mode before doing so. |
| 103 | * |
| 104 | * Additional rules: |
| 105 | * - Lock should not be held across |
| 106 | * __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT); |
| 107 | */ |
| 108 | struct rw_semaphore rwsem; |
| 109 | |
| 110 | /* Synchronization for frequency transitions */ |
| 111 | bool transition_ongoing; /* Tracks transition status */ |
| 112 | spinlock_t transition_lock; |
| 113 | wait_queue_head_t transition_wait; |
| 114 | struct task_struct *transition_task; /* Task which is doing the transition */ |
| 115 | |
| 116 | /* cpufreq-stats */ |
| 117 | struct cpufreq_stats *stats; |
| 118 | |
| 119 | /* For cpufreq driver's internal use */ |
| 120 | void *driver_data; |
| 121 | }; |
| 122 | |
| 123 | /* Only for ACPI */ |
| 124 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
| 125 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ |
| 126 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ |
| 127 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ |
| 128 | |
| 129 | #ifdef CONFIG_CPU_FREQ |
| 130 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); |
| 131 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); |
| 132 | void cpufreq_cpu_put(struct cpufreq_policy *policy); |
| 133 | #else |
| 134 | static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
| 135 | { |
| 136 | return NULL; |
| 137 | } |
| 138 | static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
| 139 | { |
| 140 | return NULL; |
| 141 | } |
| 142 | static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } |
| 143 | #endif |
| 144 | |
| 145 | static inline bool policy_is_shared(struct cpufreq_policy *policy) |
| 146 | { |
| 147 | return cpumask_weight(policy->cpus) > 1; |
| 148 | } |
| 149 | |
| 150 | /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ |
| 151 | extern struct kobject *cpufreq_global_kobject; |
| 152 | |
| 153 | #ifdef CONFIG_CPU_FREQ |
| 154 | unsigned int cpufreq_get(unsigned int cpu); |
| 155 | unsigned int cpufreq_quick_get(unsigned int cpu); |
| 156 | unsigned int cpufreq_quick_get_max(unsigned int cpu); |
| 157 | void disable_cpufreq(void); |
| 158 | |
| 159 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); |
| 160 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); |
| 161 | int cpufreq_update_policy(unsigned int cpu); |
| 162 | bool have_governor_per_policy(void); |
| 163 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); |
| 164 | #else |
| 165 | static inline unsigned int cpufreq_get(unsigned int cpu) |
| 166 | { |
| 167 | return 0; |
| 168 | } |
| 169 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) |
| 170 | { |
| 171 | return 0; |
| 172 | } |
| 173 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) |
| 174 | { |
| 175 | return 0; |
| 176 | } |
| 177 | static inline void disable_cpufreq(void) { } |
| 178 | #endif |
| 179 | |
| 180 | /********************************************************************* |
| 181 | * CPUFREQ DRIVER INTERFACE * |
| 182 | *********************************************************************/ |
| 183 | |
| 184 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ |
| 185 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ |
| 186 | #define CPUFREQ_RELATION_C 2 /* closest frequency to target */ |
| 187 | |
| 188 | struct freq_attr { |
| 189 | struct attribute attr; |
| 190 | ssize_t (*show)(struct cpufreq_policy *, char *); |
| 191 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); |
| 192 | }; |
| 193 | |
| 194 | #define cpufreq_freq_attr_ro(_name) \ |
| 195 | static struct freq_attr _name = \ |
| 196 | __ATTR(_name, 0444, show_##_name, NULL) |
| 197 | |
| 198 | #define cpufreq_freq_attr_ro_perm(_name, _perm) \ |
| 199 | static struct freq_attr _name = \ |
| 200 | __ATTR(_name, _perm, show_##_name, NULL) |
| 201 | |
| 202 | #define cpufreq_freq_attr_rw(_name) \ |
| 203 | static struct freq_attr _name = \ |
| 204 | __ATTR(_name, 0644, show_##_name, store_##_name) |
| 205 | |
| 206 | struct global_attr { |
| 207 | struct attribute attr; |
| 208 | ssize_t (*show)(struct kobject *kobj, |
| 209 | struct attribute *attr, char *buf); |
| 210 | ssize_t (*store)(struct kobject *a, struct attribute *b, |
| 211 | const char *c, size_t count); |
| 212 | }; |
| 213 | |
| 214 | #define define_one_global_ro(_name) \ |
| 215 | static struct global_attr _name = \ |
| 216 | __ATTR(_name, 0444, show_##_name, NULL) |
| 217 | |
| 218 | #define define_one_global_rw(_name) \ |
| 219 | static struct global_attr _name = \ |
| 220 | __ATTR(_name, 0644, show_##_name, store_##_name) |
| 221 | |
| 222 | |
| 223 | struct cpufreq_driver { |
| 224 | char name[CPUFREQ_NAME_LEN]; |
| 225 | u8 flags; |
| 226 | void *driver_data; |
| 227 | |
| 228 | /* needed by all drivers */ |
| 229 | int (*init)(struct cpufreq_policy *policy); |
| 230 | int (*verify)(struct cpufreq_policy *policy); |
| 231 | |
| 232 | /* define one out of two */ |
| 233 | int (*setpolicy)(struct cpufreq_policy *policy); |
| 234 | |
| 235 | /* |
| 236 | * On failure, should always restore frequency to policy->restore_freq |
| 237 | * (i.e. old freq). |
| 238 | */ |
| 239 | int (*target)(struct cpufreq_policy *policy, |
| 240 | unsigned int target_freq, |
| 241 | unsigned int relation); /* Deprecated */ |
| 242 | int (*target_index)(struct cpufreq_policy *policy, |
| 243 | unsigned int index); |
| 244 | /* |
| 245 | * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION |
| 246 | * unset. |
| 247 | * |
| 248 | * get_intermediate should return a stable intermediate frequency |
| 249 | * platform wants to switch to and target_intermediate() should set CPU |
| 250 | * to to that frequency, before jumping to the frequency corresponding |
| 251 | * to 'index'. Core will take care of sending notifications and driver |
| 252 | * doesn't have to handle them in target_intermediate() or |
| 253 | * target_index(). |
| 254 | * |
| 255 | * Drivers can return '0' from get_intermediate() in case they don't |
| 256 | * wish to switch to intermediate frequency for some target frequency. |
| 257 | * In that case core will directly call ->target_index(). |
| 258 | */ |
| 259 | unsigned int (*get_intermediate)(struct cpufreq_policy *policy, |
| 260 | unsigned int index); |
| 261 | int (*target_intermediate)(struct cpufreq_policy *policy, |
| 262 | unsigned int index); |
| 263 | |
| 264 | /* should be defined, if possible */ |
| 265 | unsigned int (*get)(unsigned int cpu); |
| 266 | |
| 267 | /* optional */ |
| 268 | int (*bios_limit)(int cpu, unsigned int *limit); |
| 269 | |
| 270 | int (*exit)(struct cpufreq_policy *policy); |
| 271 | void (*stop_cpu)(struct cpufreq_policy *policy); |
| 272 | int (*suspend)(struct cpufreq_policy *policy); |
| 273 | int (*resume)(struct cpufreq_policy *policy); |
| 274 | |
| 275 | /* Will be called after the driver is fully initialized */ |
| 276 | void (*ready)(struct cpufreq_policy *policy); |
| 277 | |
| 278 | struct freq_attr **attr; |
| 279 | |
| 280 | /* platform specific boost support code */ |
| 281 | bool boost_enabled; |
| 282 | int (*set_boost)(int state); |
| 283 | }; |
| 284 | |
| 285 | /* flags */ |
| 286 | #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if |
| 287 | all ->init() calls failed */ |
| 288 | #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other |
| 289 | kernel "constants" aren't |
| 290 | affected by frequency |
| 291 | transitions */ |
| 292 | #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume |
| 293 | speed mismatches */ |
| 294 | |
| 295 | /* |
| 296 | * This should be set by platforms having multiple clock-domains, i.e. |
| 297 | * supporting multiple policies. With this sysfs directories of governor would |
| 298 | * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same |
| 299 | * governor with different tunables for different clusters. |
| 300 | */ |
| 301 | #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3) |
| 302 | |
| 303 | /* |
| 304 | * Driver will do POSTCHANGE notifications from outside of their ->target() |
| 305 | * routine and so must set cpufreq_driver->flags with this flag, so that core |
| 306 | * can handle them specially. |
| 307 | */ |
| 308 | #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4) |
| 309 | |
| 310 | /* |
| 311 | * Set by drivers which want cpufreq core to check if CPU is running at a |
| 312 | * frequency present in freq-table exposed by the driver. For these drivers if |
| 313 | * CPU is found running at an out of table freq, we will try to set it to a freq |
| 314 | * from the table. And if that fails, we will stop further boot process by |
| 315 | * issuing a BUG_ON(). |
| 316 | */ |
| 317 | #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5) |
| 318 | |
| 319 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
| 320 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); |
| 321 | |
| 322 | const char *cpufreq_get_current_driver(void); |
| 323 | void *cpufreq_get_driver_data(void); |
| 324 | |
| 325 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, |
| 326 | unsigned int min, unsigned int max) |
| 327 | { |
| 328 | if (policy->min < min) |
| 329 | policy->min = min; |
| 330 | if (policy->max < min) |
| 331 | policy->max = min; |
| 332 | if (policy->min > max) |
| 333 | policy->min = max; |
| 334 | if (policy->max > max) |
| 335 | policy->max = max; |
| 336 | if (policy->min > policy->max) |
| 337 | policy->min = policy->max; |
| 338 | return; |
| 339 | } |
| 340 | |
| 341 | static inline void |
| 342 | cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) |
| 343 | { |
| 344 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
| 345 | policy->cpuinfo.max_freq); |
| 346 | } |
| 347 | |
| 348 | #ifdef CONFIG_CPU_FREQ |
| 349 | void cpufreq_suspend(void); |
| 350 | void cpufreq_resume(void); |
| 351 | int cpufreq_generic_suspend(struct cpufreq_policy *policy); |
| 352 | #else |
| 353 | static inline void cpufreq_suspend(void) {} |
| 354 | static inline void cpufreq_resume(void) {} |
| 355 | #endif |
| 356 | |
| 357 | /********************************************************************* |
| 358 | * CPUFREQ NOTIFIER INTERFACE * |
| 359 | *********************************************************************/ |
| 360 | |
| 361 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
| 362 | #define CPUFREQ_POLICY_NOTIFIER (1) |
| 363 | |
| 364 | /* Transition notifiers */ |
| 365 | #define CPUFREQ_PRECHANGE (0) |
| 366 | #define CPUFREQ_POSTCHANGE (1) |
| 367 | |
| 368 | /* Policy Notifiers */ |
| 369 | #define CPUFREQ_ADJUST (0) |
| 370 | #define CPUFREQ_NOTIFY (1) |
| 371 | #define CPUFREQ_START (2) |
| 372 | #define CPUFREQ_CREATE_POLICY (3) |
| 373 | #define CPUFREQ_REMOVE_POLICY (4) |
| 374 | |
| 375 | #ifdef CONFIG_CPU_FREQ |
| 376 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); |
| 377 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); |
| 378 | |
| 379 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
| 380 | struct cpufreq_freqs *freqs); |
| 381 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, |
| 382 | struct cpufreq_freqs *freqs, int transition_failed); |
| 383 | |
| 384 | #else /* CONFIG_CPU_FREQ */ |
| 385 | static inline int cpufreq_register_notifier(struct notifier_block *nb, |
| 386 | unsigned int list) |
| 387 | { |
| 388 | return 0; |
| 389 | } |
| 390 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, |
| 391 | unsigned int list) |
| 392 | { |
| 393 | return 0; |
| 394 | } |
| 395 | #endif /* !CONFIG_CPU_FREQ */ |
| 396 | |
| 397 | /** |
| 398 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch |
| 399 | * safe) |
| 400 | * @old: old value |
| 401 | * @div: divisor |
| 402 | * @mult: multiplier |
| 403 | * |
| 404 | * |
| 405 | * new = old * mult / div |
| 406 | */ |
| 407 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, |
| 408 | u_int mult) |
| 409 | { |
| 410 | #if BITS_PER_LONG == 32 |
| 411 | u64 result = ((u64) old) * ((u64) mult); |
| 412 | do_div(result, div); |
| 413 | return (unsigned long) result; |
| 414 | |
| 415 | #elif BITS_PER_LONG == 64 |
| 416 | unsigned long result = old * ((u64) mult); |
| 417 | result /= div; |
| 418 | return result; |
| 419 | #endif |
| 420 | } |
| 421 | |
| 422 | /********************************************************************* |
| 423 | * CPUFREQ GOVERNORS * |
| 424 | *********************************************************************/ |
| 425 | |
| 426 | /* |
| 427 | * If (cpufreq_driver->target) exists, the ->governor decides what frequency |
| 428 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these |
| 429 | * two generic policies are available: |
| 430 | */ |
| 431 | #define CPUFREQ_POLICY_POWERSAVE (1) |
| 432 | #define CPUFREQ_POLICY_PERFORMANCE (2) |
| 433 | |
| 434 | /* Governor Events */ |
| 435 | #define CPUFREQ_GOV_START 1 |
| 436 | #define CPUFREQ_GOV_STOP 2 |
| 437 | #define CPUFREQ_GOV_LIMITS 3 |
| 438 | #define CPUFREQ_GOV_POLICY_INIT 4 |
| 439 | #define CPUFREQ_GOV_POLICY_EXIT 5 |
| 440 | |
| 441 | struct cpufreq_governor { |
| 442 | char name[CPUFREQ_NAME_LEN]; |
| 443 | int initialized; |
| 444 | int (*governor) (struct cpufreq_policy *policy, |
| 445 | unsigned int event); |
| 446 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, |
| 447 | char *buf); |
| 448 | int (*store_setspeed) (struct cpufreq_policy *policy, |
| 449 | unsigned int freq); |
| 450 | unsigned int max_transition_latency; /* HW must be able to switch to |
| 451 | next freq faster than this value in nano secs or we |
| 452 | will fallback to performance governor */ |
| 453 | struct list_head governor_list; |
| 454 | struct module *owner; |
| 455 | }; |
| 456 | |
| 457 | /* Pass a target to the cpufreq driver */ |
| 458 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
| 459 | unsigned int target_freq, |
| 460 | unsigned int relation); |
| 461 | int __cpufreq_driver_target(struct cpufreq_policy *policy, |
| 462 | unsigned int target_freq, |
| 463 | unsigned int relation); |
| 464 | int cpufreq_register_governor(struct cpufreq_governor *governor); |
| 465 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); |
| 466 | |
| 467 | /* CPUFREQ DEFAULT GOVERNOR */ |
| 468 | /* |
| 469 | * Performance governor is fallback governor if any other gov failed to auto |
| 470 | * load due latency restrictions |
| 471 | */ |
| 472 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
| 473 | extern struct cpufreq_governor cpufreq_gov_performance; |
| 474 | #endif |
| 475 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
| 476 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) |
| 477 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE) |
| 478 | extern struct cpufreq_governor cpufreq_gov_powersave; |
| 479 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave) |
| 480 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) |
| 481 | extern struct cpufreq_governor cpufreq_gov_userspace; |
| 482 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace) |
| 483 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND) |
| 484 | extern struct cpufreq_governor cpufreq_gov_ondemand; |
| 485 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand) |
| 486 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE) |
| 487 | extern struct cpufreq_governor cpufreq_gov_conservative; |
| 488 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative) |
| 489 | #endif |
| 490 | |
| 491 | /********************************************************************* |
| 492 | * FREQUENCY TABLE HELPERS * |
| 493 | *********************************************************************/ |
| 494 | |
| 495 | /* Special Values of .frequency field */ |
| 496 | #define CPUFREQ_ENTRY_INVALID ~0u |
| 497 | #define CPUFREQ_TABLE_END ~1u |
| 498 | /* Special Values of .flags field */ |
| 499 | #define CPUFREQ_BOOST_FREQ (1 << 0) |
| 500 | |
| 501 | struct cpufreq_frequency_table { |
| 502 | unsigned int flags; |
| 503 | unsigned int driver_data; /* driver specific data, not used by core */ |
| 504 | unsigned int frequency; /* kHz - doesn't need to be in ascending |
| 505 | * order */ |
| 506 | }; |
| 507 | |
| 508 | #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) |
| 509 | int dev_pm_opp_init_cpufreq_table(struct device *dev, |
| 510 | struct cpufreq_frequency_table **table); |
| 511 | void dev_pm_opp_free_cpufreq_table(struct device *dev, |
| 512 | struct cpufreq_frequency_table **table); |
| 513 | #else |
| 514 | static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, |
| 515 | struct cpufreq_frequency_table |
| 516 | **table) |
| 517 | { |
| 518 | return -EINVAL; |
| 519 | } |
| 520 | |
| 521 | static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, |
| 522 | struct cpufreq_frequency_table |
| 523 | **table) |
| 524 | { |
| 525 | } |
| 526 | #endif |
| 527 | |
| 528 | static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos) |
| 529 | { |
| 530 | while ((*pos)->frequency != CPUFREQ_TABLE_END) |
| 531 | if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID) |
| 532 | return true; |
| 533 | else |
| 534 | (*pos)++; |
| 535 | return false; |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table |
| 540 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. |
| 541 | * @table: the cpufreq_frequency_table * to iterate over. |
| 542 | */ |
| 543 | |
| 544 | #define cpufreq_for_each_entry(pos, table) \ |
| 545 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) |
| 546 | |
| 547 | /* |
| 548 | * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table |
| 549 | * excluding CPUFREQ_ENTRY_INVALID frequencies. |
| 550 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. |
| 551 | * @table: the cpufreq_frequency_table * to iterate over. |
| 552 | */ |
| 553 | |
| 554 | #define cpufreq_for_each_valid_entry(pos, table) \ |
| 555 | for (pos = table; cpufreq_next_valid(&pos); pos++) |
| 556 | |
| 557 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, |
| 558 | struct cpufreq_frequency_table *table); |
| 559 | |
| 560 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, |
| 561 | struct cpufreq_frequency_table *table); |
| 562 | int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy); |
| 563 | |
| 564 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, |
| 565 | struct cpufreq_frequency_table *table, |
| 566 | unsigned int target_freq, |
| 567 | unsigned int relation, |
| 568 | unsigned int *index); |
| 569 | int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, |
| 570 | unsigned int freq); |
| 571 | |
| 572 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); |
| 573 | |
| 574 | #ifdef CONFIG_CPU_FREQ |
| 575 | int cpufreq_boost_trigger_state(int state); |
| 576 | int cpufreq_boost_enabled(void); |
| 577 | int cpufreq_enable_boost_support(void); |
| 578 | bool policy_has_boost_freq(struct cpufreq_policy *policy); |
| 579 | #else |
| 580 | static inline int cpufreq_boost_trigger_state(int state) |
| 581 | { |
| 582 | return 0; |
| 583 | } |
| 584 | static inline int cpufreq_boost_enabled(void) |
| 585 | { |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | static inline int cpufreq_enable_boost_support(void) |
| 590 | { |
| 591 | return -EINVAL; |
| 592 | } |
| 593 | |
| 594 | static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) |
| 595 | { |
| 596 | return false; |
| 597 | } |
| 598 | #endif |
| 599 | /* the following funtion is for cpufreq core use only */ |
| 600 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); |
| 601 | |
| 602 | /* the following are really really optional */ |
| 603 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; |
| 604 | extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; |
| 605 | extern struct freq_attr *cpufreq_generic_attr[]; |
| 606 | int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, |
| 607 | struct cpufreq_frequency_table *table); |
| 608 | |
| 609 | unsigned int cpufreq_generic_get(unsigned int cpu); |
| 610 | int cpufreq_generic_init(struct cpufreq_policy *policy, |
| 611 | struct cpufreq_frequency_table *table, |
| 612 | unsigned int transition_latency); |
| 613 | #endif /* _LINUX_CPUFREQ_H */ |