Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2 | * linux/include/linux/cpufreq.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 4 | * Copyright (C) 2001 Russell King |
| 5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> |
Thiago Farina | 335dc33 | 2011-04-28 20:42:53 -0300 | [diff] [blame] | 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 14 | #include <linux/clk.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/cpumask.h> |
Viresh Kumar | 5ff0a26 | 2013-08-06 22:53:03 +0530 | [diff] [blame] | 16 | #include <linux/completion.h> |
| 17 | #include <linux/kobject.h> |
| 18 | #include <linux/notifier.h> |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 19 | #include <linux/spinlock.h> |
Viresh Kumar | 5ff0a26 | 2013-08-06 22:53:03 +0530 | [diff] [blame] | 20 | #include <linux/sysfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | /********************************************************************* |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 23 | * CPUFREQ INTERFACE * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | *********************************************************************/ |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 25 | /* |
| 26 | * Frequency values here are CPU kHz |
| 27 | * |
Dave Jones | b53cc6e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 28 | * Maximum transition latency is in nanoseconds - if it's unknown, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | * CPUFREQ_ETERNAL shall be used. |
| 30 | */ |
| 31 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | struct cpufreq_governor; |
| 38 | |
Viresh Kumar | da0c6dc | 2016-06-27 16:04:07 +0530 | [diff] [blame^] | 39 | enum cpufreq_table_sorting { |
| 40 | CPUFREQ_TABLE_UNSORTED, |
| 41 | CPUFREQ_TABLE_SORTED_ASCENDING, |
| 42 | CPUFREQ_TABLE_SORTED_DESCENDING |
| 43 | }; |
| 44 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 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 | }; |
Thomas Renninger | 8aa84ad | 2009-07-24 15:25:05 +0200 | [diff] [blame] | 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | struct cpufreq_cpuinfo { |
| 53 | unsigned int max_freq; |
| 54 | unsigned int min_freq; |
Thiago Farina | 335dc33 | 2011-04-28 20:42:53 -0300 | [diff] [blame] | 55 | |
| 56 | /* in 10^(-9) s = nanoseconds */ |
| 57 | unsigned int transition_latency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | }; |
| 59 | |
Viresh Kumar | c7a7b41 | 2015-08-03 08:36:19 +0530 | [diff] [blame] | 60 | struct cpufreq_user_policy { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | unsigned int min; /* in kHz */ |
| 62 | unsigned int max; /* in kHz */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | struct cpufreq_policy { |
Viresh Kumar | 951fc5f | 2013-01-31 02:03:53 +0000 | [diff] [blame] | 66 | /* CPUs sharing clock, require sw coordination */ |
| 67 | cpumask_var_t cpus; /* Online CPUs only */ |
| 68 | cpumask_var_t related_cpus; /* Online + Offline CPUs */ |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 69 | cpumask_var_t real_cpus; /* Related and present */ |
Viresh Kumar | 951fc5f | 2013-01-31 02:03:53 +0000 | [diff] [blame] | 70 | |
Viresh Kumar | 62b36cc | 2013-02-01 06:40:02 +0000 | [diff] [blame] | 71 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
Venkatesh Pallipadi | 3b2d994 | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 72 | should set cpufreq */ |
Saravana Kannan | 9d16f20 | 2015-05-18 10:43:31 +0530 | [diff] [blame] | 73 | unsigned int cpu; /* cpu managing this policy, must be online */ |
Saravana Kannan | 9d16f20 | 2015-05-18 10:43:31 +0530 | [diff] [blame] | 74 | |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 75 | struct clk *clk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 82 | unsigned int restore_freq; /* = policy->cur before transition */ |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 83 | unsigned int suspend_freq; /* freq to set during suspend */ |
| 84 | |
Thiago Farina | 335dc33 | 2011-04-28 20:42:53 -0300 | [diff] [blame] | 85 | unsigned int policy; /* see above */ |
Srinivas Pandruvada | 69030dd | 2015-12-01 16:52:14 -0800 | [diff] [blame] | 86 | unsigned int last_policy; /* policy before unplug */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | struct cpufreq_governor *governor; /* see below */ |
Viresh Kumar | 7bd353a | 2013-03-27 15:58:57 +0000 | [diff] [blame] | 88 | void *governor_data; |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 89 | char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | struct work_struct update; /* if update_policy() needs to be |
| 92 | * called, but you're in IRQ context */ |
| 93 | |
Viresh Kumar | c7a7b41 | 2015-08-03 08:36:19 +0530 | [diff] [blame] | 94 | struct cpufreq_user_policy user_policy; |
Viresh Kumar | e0b3165 | 2014-03-10 14:53:33 +0530 | [diff] [blame] | 95 | struct cpufreq_frequency_table *freq_table; |
Viresh Kumar | da0c6dc | 2016-06-27 16:04:07 +0530 | [diff] [blame^] | 96 | enum cpufreq_table_sorting freq_table_sorted; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Lukasz Majewski | c88a1f8 | 2013-08-06 22:53:08 +0530 | [diff] [blame] | 98 | struct list_head policy_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | struct kobject kobj; |
| 100 | struct completion kobj_unregister; |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 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. |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 109 | */ |
| 110 | struct rw_semaphore rwsem; |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 111 | |
Rafael J. Wysocki | b7898fd | 2016-03-30 03:47:49 +0200 | [diff] [blame] | 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 | * freqnency switching with the help of cpufreq_enable_fast_switch(). |
| 119 | */ |
| 120 | bool fast_switch_possible; |
| 121 | bool fast_switch_enabled; |
| 122 | |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 123 | /* Synchronization for frequency transitions */ |
| 124 | bool transition_ongoing; /* Tracks transition status */ |
| 125 | spinlock_t transition_lock; |
| 126 | wait_queue_head_t transition_wait; |
Srivatsa S. Bhat | ca654dc | 2014-05-05 12:52:39 +0530 | [diff] [blame] | 127 | struct task_struct *transition_task; /* Task which is doing the transition */ |
Viresh Kumar | 413fffc | 2014-08-28 11:22:23 +0530 | [diff] [blame] | 128 | |
Viresh Kumar | a9aaf29 | 2015-01-13 11:34:00 +0530 | [diff] [blame] | 129 | /* cpufreq-stats */ |
| 130 | struct cpufreq_stats *stats; |
| 131 | |
Viresh Kumar | 413fffc | 2014-08-28 11:22:23 +0530 | [diff] [blame] | 132 | /* For cpufreq driver's internal use */ |
| 133 | void *driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | }; |
| 135 | |
Viresh Kumar | 62b36cc | 2013-02-01 06:40:02 +0000 | [diff] [blame] | 136 | /* Only for ACPI */ |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 137 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
| 138 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ |
| 139 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ |
| 140 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Daniel Vetter | c75b505 | 2013-10-08 10:56:11 +0200 | [diff] [blame] | 142 | #ifdef CONFIG_CPU_FREQ |
Rafael J. Wysocki | 1f0bd44 | 2015-09-16 02:17:49 +0200 | [diff] [blame] | 143 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 144 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 145 | void cpufreq_cpu_put(struct cpufreq_policy *policy); |
Daniel Vetter | c75b505 | 2013-10-08 10:56:11 +0200 | [diff] [blame] | 146 | #else |
Rafael J. Wysocki | 1f0bd44 | 2015-09-16 02:17:49 +0200 | [diff] [blame] | 147 | static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
| 148 | { |
| 149 | return NULL; |
| 150 | } |
Daniel Vetter | c75b505 | 2013-10-08 10:56:11 +0200 | [diff] [blame] | 151 | static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
| 152 | { |
| 153 | return NULL; |
| 154 | } |
| 155 | static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } |
| 156 | #endif |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 157 | |
Fabio Baltieri | 2624f90 | 2013-01-31 09:44:40 +0000 | [diff] [blame] | 158 | static inline bool policy_is_shared(struct cpufreq_policy *policy) |
| 159 | { |
| 160 | return cpumask_weight(policy->cpus) > 1; |
| 161 | } |
| 162 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 163 | /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ |
| 164 | extern struct kobject *cpufreq_global_kobject; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 166 | #ifdef CONFIG_CPU_FREQ |
| 167 | unsigned int cpufreq_get(unsigned int cpu); |
| 168 | unsigned int cpufreq_quick_get(unsigned int cpu); |
| 169 | unsigned int cpufreq_quick_get_max(unsigned int cpu); |
| 170 | void disable_cpufreq(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 172 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); |
| 173 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); |
| 174 | int cpufreq_update_policy(unsigned int cpu); |
| 175 | bool have_governor_per_policy(void); |
| 176 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); |
Rafael J. Wysocki | b7898fd | 2016-03-30 03:47:49 +0200 | [diff] [blame] | 177 | void cpufreq_enable_fast_switch(struct cpufreq_policy *policy); |
Rafael J. Wysocki | 6c9d9c8 | 2016-04-07 23:38:46 +0200 | [diff] [blame] | 178 | void cpufreq_disable_fast_switch(struct cpufreq_policy *policy); |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 179 | #else |
| 180 | static inline unsigned int cpufreq_get(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 182 | return 0; |
| 183 | } |
| 184 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) |
| 185 | { |
| 186 | return 0; |
| 187 | } |
| 188 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) |
| 189 | { |
| 190 | return 0; |
| 191 | } |
| 192 | static inline void disable_cpufreq(void) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
Rafael J. Wysocki | 1aefc75 | 2016-05-31 22:14:44 +0200 | [diff] [blame] | 195 | #ifdef CONFIG_CPU_FREQ_STAT |
| 196 | void cpufreq_stats_create_table(struct cpufreq_policy *policy); |
| 197 | void cpufreq_stats_free_table(struct cpufreq_policy *policy); |
| 198 | void cpufreq_stats_record_transition(struct cpufreq_policy *policy, |
| 199 | unsigned int new_freq); |
| 200 | #else |
| 201 | static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { } |
| 202 | static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { } |
| 203 | static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy, |
| 204 | unsigned int new_freq) { } |
| 205 | #endif /* CONFIG_CPU_FREQ_STAT */ |
| 206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | /********************************************************************* |
| 208 | * CPUFREQ DRIVER INTERFACE * |
| 209 | *********************************************************************/ |
| 210 | |
| 211 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ |
| 212 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ |
Stratos Karafotis | 5b0c0b1 | 2014-06-30 19:59:33 +0300 | [diff] [blame] | 213 | #define CPUFREQ_RELATION_C 2 /* closest frequency to target */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 215 | struct freq_attr { |
| 216 | struct attribute attr; |
| 217 | ssize_t (*show)(struct cpufreq_policy *, char *); |
| 218 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); |
| 219 | }; |
| 220 | |
| 221 | #define cpufreq_freq_attr_ro(_name) \ |
| 222 | static struct freq_attr _name = \ |
| 223 | __ATTR(_name, 0444, show_##_name, NULL) |
| 224 | |
| 225 | #define cpufreq_freq_attr_ro_perm(_name, _perm) \ |
| 226 | static struct freq_attr _name = \ |
| 227 | __ATTR(_name, _perm, show_##_name, NULL) |
| 228 | |
| 229 | #define cpufreq_freq_attr_rw(_name) \ |
| 230 | static struct freq_attr _name = \ |
| 231 | __ATTR(_name, 0644, show_##_name, store_##_name) |
| 232 | |
| 233 | struct global_attr { |
| 234 | struct attribute attr; |
| 235 | ssize_t (*show)(struct kobject *kobj, |
| 236 | struct attribute *attr, char *buf); |
| 237 | ssize_t (*store)(struct kobject *a, struct attribute *b, |
| 238 | const char *c, size_t count); |
| 239 | }; |
| 240 | |
| 241 | #define define_one_global_ro(_name) \ |
| 242 | static struct global_attr _name = \ |
| 243 | __ATTR(_name, 0444, show_##_name, NULL) |
| 244 | |
| 245 | #define define_one_global_rw(_name) \ |
| 246 | static struct global_attr _name = \ |
| 247 | __ATTR(_name, 0644, show_##_name, store_##_name) |
| 248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | struct cpufreq_driver { |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 251 | char name[CPUFREQ_NAME_LEN]; |
| 252 | u8 flags; |
| 253 | void *driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | /* needed by all drivers */ |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 256 | int (*init)(struct cpufreq_policy *policy); |
| 257 | int (*verify)(struct cpufreq_policy *policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | /* define one out of two */ |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 260 | int (*setpolicy)(struct cpufreq_policy *policy); |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 261 | |
| 262 | /* |
| 263 | * On failure, should always restore frequency to policy->restore_freq |
| 264 | * (i.e. old freq). |
| 265 | */ |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 266 | int (*target)(struct cpufreq_policy *policy, |
| 267 | unsigned int target_freq, |
| 268 | unsigned int relation); /* Deprecated */ |
| 269 | int (*target_index)(struct cpufreq_policy *policy, |
| 270 | unsigned int index); |
Rafael J. Wysocki | b7898fd | 2016-03-30 03:47:49 +0200 | [diff] [blame] | 271 | unsigned int (*fast_switch)(struct cpufreq_policy *policy, |
| 272 | unsigned int target_freq); |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 273 | /* |
| 274 | * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION |
| 275 | * unset. |
| 276 | * |
| 277 | * get_intermediate should return a stable intermediate frequency |
| 278 | * platform wants to switch to and target_intermediate() should set CPU |
| 279 | * to to that frequency, before jumping to the frequency corresponding |
| 280 | * to 'index'. Core will take care of sending notifications and driver |
| 281 | * doesn't have to handle them in target_intermediate() or |
| 282 | * target_index(). |
| 283 | * |
| 284 | * Drivers can return '0' from get_intermediate() in case they don't |
| 285 | * wish to switch to intermediate frequency for some target frequency. |
| 286 | * In that case core will directly call ->target_index(). |
| 287 | */ |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 288 | unsigned int (*get_intermediate)(struct cpufreq_policy *policy, |
| 289 | unsigned int index); |
| 290 | int (*target_intermediate)(struct cpufreq_policy *policy, |
| 291 | unsigned int index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
| 293 | /* should be defined, if possible */ |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 294 | unsigned int (*get)(unsigned int cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
| 296 | /* optional */ |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 297 | int (*bios_limit)(int cpu, unsigned int *limit); |
venkatesh.pallipadi@intel.com | bf0b90e | 2008-08-04 11:59:07 -0700 | [diff] [blame] | 298 | |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 299 | int (*exit)(struct cpufreq_policy *policy); |
| 300 | void (*stop_cpu)(struct cpufreq_policy *policy); |
| 301 | int (*suspend)(struct cpufreq_policy *policy); |
| 302 | int (*resume)(struct cpufreq_policy *policy); |
Viresh Kumar | 7c45cf3 | 2014-11-27 06:07:51 +0530 | [diff] [blame] | 303 | |
| 304 | /* Will be called after the driver is fully initialized */ |
| 305 | void (*ready)(struct cpufreq_policy *policy); |
| 306 | |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 307 | struct freq_attr **attr; |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 308 | |
| 309 | /* platform specific boost support code */ |
Viresh Kumar | 90452e6 | 2014-11-27 06:07:49 +0530 | [diff] [blame] | 310 | bool boost_enabled; |
| 311 | int (*set_boost)(int state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | }; |
| 313 | |
| 314 | /* flags */ |
Viresh Kumar | 6461f01 | 2013-10-02 14:13:17 +0530 | [diff] [blame] | 315 | #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if |
| 316 | all ->init() calls failed */ |
| 317 | #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other |
| 318 | kernel "constants" aren't |
| 319 | affected by frequency |
| 320 | transitions */ |
| 321 | #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume |
| 322 | speed mismatches */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Viresh Kumar | 0b981e7 | 2013-10-02 14:13:18 +0530 | [diff] [blame] | 324 | /* |
| 325 | * This should be set by platforms having multiple clock-domains, i.e. |
| 326 | * supporting multiple policies. With this sysfs directories of governor would |
| 327 | * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same |
| 328 | * governor with different tunables for different clusters. |
| 329 | */ |
| 330 | #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3) |
| 331 | |
Viresh Kumar | 7dbf694 | 2013-10-29 18:56:06 +0530 | [diff] [blame] | 332 | /* |
| 333 | * Driver will do POSTCHANGE notifications from outside of their ->target() |
| 334 | * routine and so must set cpufreq_driver->flags with this flag, so that core |
| 335 | * can handle them specially. |
| 336 | */ |
| 337 | #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4) |
| 338 | |
Viresh Kumar | ae6b427 | 2013-12-03 11:20:45 +0530 | [diff] [blame] | 339 | /* |
| 340 | * Set by drivers which want cpufreq core to check if CPU is running at a |
| 341 | * frequency present in freq-table exposed by the driver. For these drivers if |
| 342 | * CPU is found running at an out of table freq, we will try to set it to a freq |
| 343 | * from the table. And if that fails, we will stop further boot process by |
| 344 | * issuing a BUG_ON(). |
| 345 | */ |
| 346 | #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5) |
| 347 | |
Linus Torvalds | 221dee2 | 2007-02-26 14:55:48 -0800 | [diff] [blame] | 348 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
| 349 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 351 | const char *cpufreq_get_current_driver(void); |
Thomas Petazzoni | 51315cd | 2014-10-19 11:30:27 +0200 | [diff] [blame] | 352 | void *cpufreq_get_driver_data(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 354 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, |
| 355 | unsigned int min, unsigned int max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | { |
| 357 | if (policy->min < min) |
| 358 | policy->min = min; |
| 359 | if (policy->max < min) |
| 360 | policy->max = min; |
| 361 | if (policy->min > max) |
| 362 | policy->min = max; |
| 363 | if (policy->max > max) |
| 364 | policy->max = max; |
| 365 | if (policy->min > policy->max) |
| 366 | policy->min = policy->max; |
| 367 | return; |
| 368 | } |
| 369 | |
Viresh Kumar | be49e34 | 2013-10-02 14:13:19 +0530 | [diff] [blame] | 370 | static inline void |
| 371 | cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) |
| 372 | { |
| 373 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
| 374 | policy->cpuinfo.max_freq); |
| 375 | } |
| 376 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 377 | #ifdef CONFIG_CPU_FREQ |
| 378 | void cpufreq_suspend(void); |
| 379 | void cpufreq_resume(void); |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 380 | int cpufreq_generic_suspend(struct cpufreq_policy *policy); |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 381 | #else |
| 382 | static inline void cpufreq_suspend(void) {} |
| 383 | static inline void cpufreq_resume(void) {} |
| 384 | #endif |
| 385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | /********************************************************************* |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 387 | * CPUFREQ NOTIFIER INTERFACE * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | *********************************************************************/ |
| 389 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 390 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
| 391 | #define CPUFREQ_POLICY_NOTIFIER (1) |
| 392 | |
| 393 | /* Transition notifiers */ |
| 394 | #define CPUFREQ_PRECHANGE (0) |
| 395 | #define CPUFREQ_POSTCHANGE (1) |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 396 | |
| 397 | /* Policy Notifiers */ |
| 398 | #define CPUFREQ_ADJUST (0) |
Viresh Kumar | 6bfb7c7 | 2015-08-03 08:36:14 +0530 | [diff] [blame] | 399 | #define CPUFREQ_NOTIFY (1) |
| 400 | #define CPUFREQ_START (2) |
| 401 | #define CPUFREQ_CREATE_POLICY (3) |
| 402 | #define CPUFREQ_REMOVE_POLICY (4) |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 403 | |
| 404 | #ifdef CONFIG_CPU_FREQ |
| 405 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); |
| 406 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); |
| 407 | |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 408 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
| 409 | struct cpufreq_freqs *freqs); |
| 410 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, |
| 411 | struct cpufreq_freqs *freqs, int transition_failed); |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 412 | |
| 413 | #else /* CONFIG_CPU_FREQ */ |
| 414 | static inline int cpufreq_register_notifier(struct notifier_block *nb, |
| 415 | unsigned int list) |
| 416 | { |
| 417 | return 0; |
| 418 | } |
| 419 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, |
| 420 | unsigned int list) |
| 421 | { |
| 422 | return 0; |
| 423 | } |
| 424 | #endif /* !CONFIG_CPU_FREQ */ |
| 425 | |
| 426 | /** |
| 427 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch |
| 428 | * safe) |
| 429 | * @old: old value |
| 430 | * @div: divisor |
| 431 | * @mult: multiplier |
| 432 | * |
| 433 | * |
| 434 | * new = old * mult / div |
| 435 | */ |
| 436 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, |
| 437 | u_int mult) |
| 438 | { |
| 439 | #if BITS_PER_LONG == 32 |
| 440 | u64 result = ((u64) old) * ((u64) mult); |
| 441 | do_div(result, div); |
| 442 | return (unsigned long) result; |
| 443 | |
| 444 | #elif BITS_PER_LONG == 64 |
| 445 | unsigned long result = old * ((u64) mult); |
| 446 | result /= div; |
| 447 | return result; |
| 448 | #endif |
| 449 | } |
| 450 | |
| 451 | /********************************************************************* |
| 452 | * CPUFREQ GOVERNORS * |
| 453 | *********************************************************************/ |
| 454 | |
| 455 | /* |
| 456 | * If (cpufreq_driver->target) exists, the ->governor decides what frequency |
| 457 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these |
| 458 | * two generic policies are available: |
| 459 | */ |
| 460 | #define CPUFREQ_POLICY_POWERSAVE (1) |
| 461 | #define CPUFREQ_POLICY_PERFORMANCE (2) |
| 462 | |
Rafael J. Wysocki | 379480d | 2016-03-22 02:51:56 +0100 | [diff] [blame] | 463 | /* |
| 464 | * The polling frequency depends on the capability of the processor. Default |
| 465 | * polling frequency is 1000 times the transition latency of the processor. The |
| 466 | * ondemand governor will work on any processor with transition latency <= 10ms, |
| 467 | * using appropriate sampling rate. |
| 468 | * |
| 469 | * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL) |
| 470 | * the ondemand governor will not work. All times here are in us (microseconds). |
| 471 | */ |
| 472 | #define MIN_SAMPLING_RATE_RATIO (2) |
| 473 | #define LATENCY_MULTIPLIER (1000) |
| 474 | #define MIN_LATENCY_MULTIPLIER (20) |
| 475 | #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) |
| 476 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 477 | struct cpufreq_governor { |
| 478 | char name[CPUFREQ_NAME_LEN]; |
Rafael J. Wysocki | e788892 | 2016-06-02 23:24:15 +0200 | [diff] [blame] | 479 | int (*init)(struct cpufreq_policy *policy); |
| 480 | void (*exit)(struct cpufreq_policy *policy); |
| 481 | int (*start)(struct cpufreq_policy *policy); |
| 482 | void (*stop)(struct cpufreq_policy *policy); |
| 483 | void (*limits)(struct cpufreq_policy *policy); |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 484 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, |
| 485 | char *buf); |
| 486 | int (*store_setspeed) (struct cpufreq_policy *policy, |
| 487 | unsigned int freq); |
| 488 | unsigned int max_transition_latency; /* HW must be able to switch to |
| 489 | next freq faster than this value in nano secs or we |
| 490 | will fallback to performance governor */ |
| 491 | struct list_head governor_list; |
| 492 | struct module *owner; |
| 493 | }; |
| 494 | |
| 495 | /* Pass a target to the cpufreq driver */ |
Rafael J. Wysocki | b7898fd | 2016-03-30 03:47:49 +0200 | [diff] [blame] | 496 | unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, |
| 497 | unsigned int target_freq); |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 498 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
| 499 | unsigned int target_freq, |
| 500 | unsigned int relation); |
| 501 | int __cpufreq_driver_target(struct cpufreq_policy *policy, |
| 502 | unsigned int target_freq, |
| 503 | unsigned int relation); |
| 504 | int cpufreq_register_governor(struct cpufreq_governor *governor); |
| 505 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); |
| 506 | |
Rafael J. Wysocki | de1df26 | 2016-02-05 02:37:42 +0100 | [diff] [blame] | 507 | struct cpufreq_governor *cpufreq_default_governor(void); |
| 508 | struct cpufreq_governor *cpufreq_fallback_governor(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Viresh Kumar | bf2be2d | 2016-05-18 17:55:31 +0530 | [diff] [blame] | 510 | static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy) |
| 511 | { |
| 512 | if (policy->max < policy->cur) |
| 513 | __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H); |
| 514 | else if (policy->min > policy->cur) |
| 515 | __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L); |
| 516 | } |
| 517 | |
Rafael J. Wysocki | 66893b6 | 2016-03-22 02:50:45 +0100 | [diff] [blame] | 518 | /* Governor attribute set */ |
| 519 | struct gov_attr_set { |
| 520 | struct kobject kobj; |
| 521 | struct list_head policy_list; |
| 522 | struct mutex update_lock; |
| 523 | int usage_count; |
| 524 | }; |
| 525 | |
| 526 | /* sysfs ops for cpufreq governors */ |
| 527 | extern const struct sysfs_ops governor_sysfs_ops; |
| 528 | |
| 529 | void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node); |
| 530 | void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node); |
| 531 | unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node); |
| 532 | |
| 533 | /* Governor sysfs attribute */ |
| 534 | struct governor_attr { |
| 535 | struct attribute attr; |
| 536 | ssize_t (*show)(struct gov_attr_set *attr_set, char *buf); |
| 537 | ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf, |
| 538 | size_t count); |
| 539 | }; |
| 540 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | /********************************************************************* |
| 542 | * FREQUENCY TABLE HELPERS * |
| 543 | *********************************************************************/ |
| 544 | |
Viresh Kumar | 7f4b046 | 2014-03-28 19:11:47 +0530 | [diff] [blame] | 545 | /* Special Values of .frequency field */ |
Brian W Hart | 2b1987a | 2014-06-27 16:09:39 -0500 | [diff] [blame] | 546 | #define CPUFREQ_ENTRY_INVALID ~0u |
| 547 | #define CPUFREQ_TABLE_END ~1u |
Viresh Kumar | 7f4b046 | 2014-03-28 19:11:47 +0530 | [diff] [blame] | 548 | /* Special Values of .flags field */ |
| 549 | #define CPUFREQ_BOOST_FREQ (1 << 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
| 551 | struct cpufreq_frequency_table { |
Viresh Kumar | 7f4b046 | 2014-03-28 19:11:47 +0530 | [diff] [blame] | 552 | unsigned int flags; |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 553 | unsigned int driver_data; /* driver specific data, not used by core */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | unsigned int frequency; /* kHz - doesn't need to be in ascending |
| 555 | * order */ |
| 556 | }; |
| 557 | |
Nishanth Menon | a0dd7b7 | 2014-05-05 08:33:50 -0500 | [diff] [blame] | 558 | #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) |
| 559 | int dev_pm_opp_init_cpufreq_table(struct device *dev, |
| 560 | struct cpufreq_frequency_table **table); |
| 561 | void dev_pm_opp_free_cpufreq_table(struct device *dev, |
| 562 | struct cpufreq_frequency_table **table); |
| 563 | #else |
| 564 | static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, |
| 565 | struct cpufreq_frequency_table |
| 566 | **table) |
| 567 | { |
| 568 | return -EINVAL; |
| 569 | } |
| 570 | |
| 571 | static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, |
| 572 | struct cpufreq_frequency_table |
| 573 | **table) |
| 574 | { |
| 575 | } |
| 576 | #endif |
| 577 | |
Stratos Karafotis | 27e289d | 2014-04-25 23:15:23 +0300 | [diff] [blame] | 578 | /* |
| 579 | * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table |
| 580 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. |
| 581 | * @table: the cpufreq_frequency_table * to iterate over. |
| 582 | */ |
| 583 | |
| 584 | #define cpufreq_for_each_entry(pos, table) \ |
| 585 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) |
| 586 | |
| 587 | /* |
| 588 | * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table |
| 589 | * excluding CPUFREQ_ENTRY_INVALID frequencies. |
| 590 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. |
| 591 | * @table: the cpufreq_frequency_table * to iterate over. |
| 592 | */ |
| 593 | |
Rafael J. Wysocki | 34b0870 | 2016-02-26 00:22:57 +0100 | [diff] [blame] | 594 | #define cpufreq_for_each_valid_entry(pos, table) \ |
| 595 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \ |
| 596 | if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ |
| 597 | continue; \ |
| 598 | else |
Stratos Karafotis | 27e289d | 2014-04-25 23:15:23 +0300 | [diff] [blame] | 599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, |
| 601 | struct cpufreq_frequency_table *table); |
| 602 | |
| 603 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, |
| 604 | struct cpufreq_frequency_table *table); |
Viresh Kumar | 1843451 | 2013-10-03 20:27:55 +0530 | [diff] [blame] | 605 | int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Viresh Kumar | da0c6dc | 2016-06-27 16:04:07 +0530 | [diff] [blame^] | 607 | int cpufreq_table_index_unsorted(struct cpufreq_policy *policy, |
| 608 | unsigned int target_freq, |
| 609 | unsigned int relation); |
Viresh Kumar | d391669 | 2013-12-03 11:20:46 +0530 | [diff] [blame] | 610 | int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, |
| 611 | unsigned int freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Viresh Kumar | 74aca95 | 2013-08-06 22:53:04 +0530 | [diff] [blame] | 613 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); |
| 614 | |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 615 | #ifdef CONFIG_CPU_FREQ |
| 616 | int cpufreq_boost_trigger_state(int state); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 617 | int cpufreq_boost_enabled(void); |
Viresh Kumar | 44139ed | 2015-07-29 16:23:09 +0530 | [diff] [blame] | 618 | int cpufreq_enable_boost_support(void); |
| 619 | bool policy_has_boost_freq(struct cpufreq_policy *policy); |
Viresh Kumar | da0c6dc | 2016-06-27 16:04:07 +0530 | [diff] [blame^] | 620 | |
| 621 | /* Find lowest freq at or above target in a table in ascending order */ |
| 622 | static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy, |
| 623 | unsigned int target_freq) |
| 624 | { |
| 625 | struct cpufreq_frequency_table *table = policy->freq_table; |
| 626 | unsigned int freq; |
| 627 | int i, best = -1; |
| 628 | |
| 629 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
| 630 | freq = table[i].frequency; |
| 631 | |
| 632 | if (freq >= target_freq) |
| 633 | return i; |
| 634 | |
| 635 | best = i; |
| 636 | } |
| 637 | |
| 638 | return best; |
| 639 | } |
| 640 | |
| 641 | /* Find lowest freq at or above target in a table in descending order */ |
| 642 | static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy, |
| 643 | unsigned int target_freq) |
| 644 | { |
| 645 | struct cpufreq_frequency_table *table = policy->freq_table; |
| 646 | unsigned int freq; |
| 647 | int i, best = -1; |
| 648 | |
| 649 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
| 650 | freq = table[i].frequency; |
| 651 | |
| 652 | if (freq == target_freq) |
| 653 | return i; |
| 654 | |
| 655 | if (freq > target_freq) { |
| 656 | best = i; |
| 657 | continue; |
| 658 | } |
| 659 | |
| 660 | /* No freq found above target_freq */ |
| 661 | if (best == -1) |
| 662 | return i; |
| 663 | |
| 664 | return best; |
| 665 | } |
| 666 | |
| 667 | return best; |
| 668 | } |
| 669 | |
| 670 | /* Works only on sorted freq-tables */ |
| 671 | static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy, |
| 672 | unsigned int target_freq) |
| 673 | { |
| 674 | target_freq = clamp_val(target_freq, policy->min, policy->max); |
| 675 | |
| 676 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) |
| 677 | return cpufreq_table_find_index_al(policy, target_freq); |
| 678 | else |
| 679 | return cpufreq_table_find_index_dl(policy, target_freq); |
| 680 | } |
| 681 | |
| 682 | /* Find highest freq at or below target in a table in ascending order */ |
| 683 | static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy, |
| 684 | unsigned int target_freq) |
| 685 | { |
| 686 | struct cpufreq_frequency_table *table = policy->freq_table; |
| 687 | unsigned int freq; |
| 688 | int i, best = -1; |
| 689 | |
| 690 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
| 691 | freq = table[i].frequency; |
| 692 | |
| 693 | if (freq == target_freq) |
| 694 | return i; |
| 695 | |
| 696 | if (freq < target_freq) { |
| 697 | best = i; |
| 698 | continue; |
| 699 | } |
| 700 | |
| 701 | /* No freq found below target_freq */ |
| 702 | if (best == -1) |
| 703 | return i; |
| 704 | |
| 705 | return best; |
| 706 | } |
| 707 | |
| 708 | return best; |
| 709 | } |
| 710 | |
| 711 | /* Find highest freq at or below target in a table in descending order */ |
| 712 | static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy, |
| 713 | unsigned int target_freq) |
| 714 | { |
| 715 | struct cpufreq_frequency_table *table = policy->freq_table; |
| 716 | unsigned int freq; |
| 717 | int i, best = -1; |
| 718 | |
| 719 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
| 720 | freq = table[i].frequency; |
| 721 | |
| 722 | if (freq <= target_freq) |
| 723 | return i; |
| 724 | |
| 725 | best = i; |
| 726 | } |
| 727 | |
| 728 | return best; |
| 729 | } |
| 730 | |
| 731 | /* Works only on sorted freq-tables */ |
| 732 | static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy, |
| 733 | unsigned int target_freq) |
| 734 | { |
| 735 | target_freq = clamp_val(target_freq, policy->min, policy->max); |
| 736 | |
| 737 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) |
| 738 | return cpufreq_table_find_index_ah(policy, target_freq); |
| 739 | else |
| 740 | return cpufreq_table_find_index_dh(policy, target_freq); |
| 741 | } |
| 742 | |
| 743 | /* Find closest freq to target in a table in ascending order */ |
| 744 | static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy, |
| 745 | unsigned int target_freq) |
| 746 | { |
| 747 | struct cpufreq_frequency_table *table = policy->freq_table; |
| 748 | unsigned int freq; |
| 749 | int i, best = -1; |
| 750 | |
| 751 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
| 752 | freq = table[i].frequency; |
| 753 | |
| 754 | if (freq == target_freq) |
| 755 | return i; |
| 756 | |
| 757 | if (freq < target_freq) { |
| 758 | best = i; |
| 759 | continue; |
| 760 | } |
| 761 | |
| 762 | /* No freq found below target_freq */ |
| 763 | if (best == -1) |
| 764 | return i; |
| 765 | |
| 766 | /* Choose the closest freq */ |
| 767 | if (target_freq - table[best].frequency > freq - target_freq) |
| 768 | return i; |
| 769 | |
| 770 | return best; |
| 771 | } |
| 772 | |
| 773 | return best; |
| 774 | } |
| 775 | |
| 776 | /* Find closest freq to target in a table in descending order */ |
| 777 | static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy, |
| 778 | unsigned int target_freq) |
| 779 | { |
| 780 | struct cpufreq_frequency_table *table = policy->freq_table; |
| 781 | unsigned int freq; |
| 782 | int i, best = -1; |
| 783 | |
| 784 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
| 785 | freq = table[i].frequency; |
| 786 | |
| 787 | if (freq == target_freq) |
| 788 | return i; |
| 789 | |
| 790 | if (freq > target_freq) { |
| 791 | best = i; |
| 792 | continue; |
| 793 | } |
| 794 | |
| 795 | /* No freq found above target_freq */ |
| 796 | if (best == -1) |
| 797 | return i; |
| 798 | |
| 799 | /* Choose the closest freq */ |
| 800 | if (table[best].frequency - target_freq > target_freq - freq) |
| 801 | return i; |
| 802 | |
| 803 | return best; |
| 804 | } |
| 805 | |
| 806 | return best; |
| 807 | } |
| 808 | |
| 809 | /* Works only on sorted freq-tables */ |
| 810 | static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy, |
| 811 | unsigned int target_freq) |
| 812 | { |
| 813 | target_freq = clamp_val(target_freq, policy->min, policy->max); |
| 814 | |
| 815 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) |
| 816 | return cpufreq_table_find_index_ac(policy, target_freq); |
| 817 | else |
| 818 | return cpufreq_table_find_index_dc(policy, target_freq); |
| 819 | } |
| 820 | |
| 821 | static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy, |
| 822 | unsigned int target_freq, |
| 823 | unsigned int relation) |
| 824 | { |
| 825 | if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)) |
| 826 | return cpufreq_table_index_unsorted(policy, target_freq, |
| 827 | relation); |
| 828 | |
| 829 | switch (relation) { |
| 830 | case CPUFREQ_RELATION_L: |
| 831 | return cpufreq_table_find_index_l(policy, target_freq); |
| 832 | case CPUFREQ_RELATION_H: |
| 833 | return cpufreq_table_find_index_h(policy, target_freq); |
| 834 | case CPUFREQ_RELATION_C: |
| 835 | return cpufreq_table_find_index_c(policy, target_freq); |
| 836 | default: |
| 837 | pr_err("%s: Invalid relation: %d\n", __func__, relation); |
| 838 | return -EINVAL; |
| 839 | } |
| 840 | } |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 841 | #else |
| 842 | static inline int cpufreq_boost_trigger_state(int state) |
| 843 | { |
| 844 | return 0; |
| 845 | } |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 846 | static inline int cpufreq_boost_enabled(void) |
| 847 | { |
| 848 | return 0; |
| 849 | } |
Viresh Kumar | 44139ed | 2015-07-29 16:23:09 +0530 | [diff] [blame] | 850 | |
| 851 | static inline int cpufreq_enable_boost_support(void) |
| 852 | { |
| 853 | return -EINVAL; |
| 854 | } |
| 855 | |
| 856 | static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) |
| 857 | { |
| 858 | return false; |
| 859 | } |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 860 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
| 862 | /* the following are really really optional */ |
| 863 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; |
Bartlomiej Zolnierkiewicz | 21c36d3 | 2015-08-07 13:59:16 +0200 | [diff] [blame] | 864 | extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; |
Viresh Kumar | 1843451 | 2013-10-03 20:27:55 +0530 | [diff] [blame] | 865 | extern struct freq_attr *cpufreq_generic_attr[]; |
Viresh Kumar | 27047a6 | 2013-09-16 18:56:03 +0530 | [diff] [blame] | 866 | int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, |
| 867 | struct cpufreq_frequency_table *table); |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 868 | |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 869 | unsigned int cpufreq_generic_get(unsigned int cpu); |
Viresh Kumar | 70e9e77 | 2013-10-03 20:29:07 +0530 | [diff] [blame] | 870 | int cpufreq_generic_init(struct cpufreq_policy *policy, |
| 871 | struct cpufreq_frequency_table *table, |
| 872 | unsigned int transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | #endif /* _LINUX_CPUFREQ_H */ |