include/linux/pm_opp.h

   1 /*
   2  * Generic OPP Interface
   3  *
   4  * Copyright (C) 2009-2010 Texas Instruments Incorporated.
   5  *      Nishanth Menon
   6  *      Romit Dasgupta
   7  *      Kevin Hilman
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #ifndef __LINUX_OPP_H__
  15 #define __LINUX_OPP_H__
  16
  17 #include <linux/err.h>
  18 #include <linux/notifier.h>
  19
  20 struct clk;
  21 struct regulator;
  22 struct dev_pm_opp;
  23 struct device;
  24 struct opp_table;
  25
  26 enum dev_pm_opp_event {
  27         OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
  28 };
  29
  30 /**
  31  * struct dev_pm_opp_supply - Power supply voltage/current values
  32  * @u_volt:     Target voltage in microvolts corresponding to this OPP
  33  * @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
  34  * @u_volt_max: Maximum voltage in microvolts corresponding to this OPP
  35  * @u_amp:      Maximum current drawn by the device in microamperes
  36  *
  37  * This structure stores the voltage/current values for a single power supply.
  38  */
  39 struct dev_pm_opp_supply {
  40         unsigned long u_volt;
  41         unsigned long u_volt_min;
  42         unsigned long u_volt_max;
  43         unsigned long u_amp;
  44 };
  45
  46 /**
  47  * struct dev_pm_opp_info - OPP freq/voltage/current values
  48  * @rate:       Target clk rate in hz
  49  * @supplies:   Array of voltage/current values for all power supplies
  50  *
  51  * This structure stores the freq/voltage/current values for a single OPP.
  52  */
  53 struct dev_pm_opp_info {
  54         unsigned long rate;
  55         struct dev_pm_opp_supply *supplies;
  56 };
  57
  58 /**
  59  * struct dev_pm_set_opp_data - Set OPP data
  60  * @old_opp:    Old OPP info
  61  * @new_opp:    New OPP info
  62  * @regulators: Array of regulator pointers
  63  * @regulator_count: Number of regulators
  64  * @clk:        Pointer to clk
  65  * @dev:        Pointer to the struct device
  66  *
  67  * This structure contains all information required for setting an OPP.
  68  */
  69 struct dev_pm_set_opp_data {
  70         struct dev_pm_opp_info old_opp;
  71         struct dev_pm_opp_info new_opp;
  72
  73         struct regulator **regulators;
  74         unsigned int regulator_count;
  75         struct clk *clk;
  76         struct device *dev;
  77 };
  78
  79 #if defined(CONFIG_PM_OPP)
  80
  81 struct opp_table *dev_pm_opp_get_opp_table(struct device *dev);
  82 void dev_pm_opp_put_opp_table(struct opp_table *opp_table);
  83
  84 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
  85
  86 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
  87
  88 bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
  89
  90 int dev_pm_opp_get_opp_count(struct device *dev);
  91 unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
  92 unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev);
  93 unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev);
  94 unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev);
  95
  96 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  97                                               unsigned long freq,
  98                                               bool available);
  99
 100 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
 101                                               unsigned long *freq);
 102
 103 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
 104                                              unsigned long *freq);
 105 void dev_pm_opp_put(struct dev_pm_opp *opp);
 106
 107 int dev_pm_opp_add(struct device *dev, unsigned long freq,
 108                    unsigned long u_volt);
 109 void dev_pm_opp_remove(struct device *dev, unsigned long freq);
 110
 111 int dev_pm_opp_enable(struct device *dev, unsigned long freq);
 112
 113 int dev_pm_opp_disable(struct device *dev, unsigned long freq);
 114
 115 int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
 116 int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
 117
 118 struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count);
 119 void dev_pm_opp_put_supported_hw(struct opp_table *opp_table);
 120 struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name);
 121 void dev_pm_opp_put_prop_name(struct opp_table *opp_table);
 122 struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count);
 123 void dev_pm_opp_put_regulators(struct opp_table *opp_table);
 124 struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
 125 void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table);
 126 int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
 127 int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask);
 128 int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
 129 void dev_pm_opp_remove_table(struct device *dev);
 130 void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
 131 #else
 132 static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
 133 {
 134         return ERR_PTR(-ENOTSUPP);
 135 }
 136
 137 static inline void dev_pm_opp_put_opp_table(struct opp_table *opp_table) {}
 138
 139 static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
 140 {
 141         return 0;
 142 }
 143
 144 static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
 145 {
 146         return 0;
 147 }
 148
 149 static inline bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
 150 {
 151         return false;
 152 }
 153
 154 static inline int dev_pm_opp_get_opp_count(struct device *dev)
 155 {
 156         return 0;
 157 }
 158
 159 static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
 160 {
 161         return 0;
 162 }
 163
 164 static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
 165 {
 166         return 0;
 167 }
 168
 169 static inline unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
 170 {
 171         return 0;
 172 }
 173
 174 static inline unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
 175 {
 176         return 0;
 177 }
 178
 179 static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
 180                                         unsigned long freq, bool available)
 181 {
 182         return ERR_PTR(-ENOTSUPP);
 183 }
 184
 185 static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
 186                                         unsigned long *freq)
 187 {
 188         return ERR_PTR(-ENOTSUPP);
 189 }
 190
 191 static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
 192                                         unsigned long *freq)
 193 {
 194         return ERR_PTR(-ENOTSUPP);
 195 }
 196
 197 static inline void dev_pm_opp_put(struct dev_pm_opp *opp) {}
 198
 199 static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
 200                                         unsigned long u_volt)
 201 {
 202         return -ENOTSUPP;
 203 }
 204
 205 static inline void dev_pm_opp_remove(struct device *dev, unsigned long freq)
 206 {
 207 }
 208
 209 static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
 210 {
 211         return 0;
 212 }
 213
 214 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
 215 {
 216         return 0;
 217 }
 218
 219 static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
 220 {
 221         return -ENOTSUPP;
 222 }
 223
 224 static inline int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb)
 225 {
 226         return -ENOTSUPP;
 227 }
 228
 229 static inline struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
 230                                                             const u32 *versions,
 231                                                             unsigned int count)
 232 {
 233         return ERR_PTR(-ENOTSUPP);
 234 }
 235
 236 static inline void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) {}
 237
 238 static inline struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
 239                         int (*set_opp)(struct dev_pm_set_opp_data *data))
 240 {
 241         return ERR_PTR(-ENOTSUPP);
 242 }
 243
 244 static inline void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table) {}
 245
 246 static inline struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
 247 {
 248         return ERR_PTR(-ENOTSUPP);
 249 }
 250
 251 static inline void dev_pm_opp_put_prop_name(struct opp_table *opp_table) {}
 252
 253 static inline struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count)
 254 {
 255         return ERR_PTR(-ENOTSUPP);
 256 }
 257
 258 static inline void dev_pm_opp_put_regulators(struct opp_table *opp_table) {}
 259
 260 static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
 261 {
 262         return -ENOTSUPP;
 263 }
 264
 265 static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask)
 266 {
 267         return -ENOTSUPP;
 268 }
 269
 270 static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
 271 {
 272         return -EINVAL;
 273 }
 274
 275 static inline void dev_pm_opp_remove_table(struct device *dev)
 276 {
 277 }
 278
 279 static inline void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
 280 {
 281 }
 282
 283 #endif          /* CONFIG_PM_OPP */
 284
 285 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
 286 int dev_pm_opp_of_add_table(struct device *dev);
 287 void dev_pm_opp_of_remove_table(struct device *dev);
 288 int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask);
 289 void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask);
 290 int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
 291 struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
 292 #else
 293 static inline int dev_pm_opp_of_add_table(struct device *dev)
 294 {
 295         return -ENOTSUPP;
 296 }
 297
 298 static inline void dev_pm_opp_of_remove_table(struct device *dev)
 299 {
 300 }
 301
 302 static inline int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
 303 {
 304         return -ENOTSUPP;
 305 }
 306
 307 static inline void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
 308 {
 309 }
 310
 311 static inline int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
 312 {
 313         return -ENOTSUPP;
 314 }
 315
 316 static inline struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
 317 {
 318         return NULL;
 319 }
 320 #endif
 321
 322 #endif          /* __LINUX_OPP_H__ */