drivers/opp/opp.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Generic OPP Interface
   4  *
   5  * Copyright (C) 2009-2010 Texas Instruments Incorporated.
   6  *      Nishanth Menon
   7  *      Romit Dasgupta
   8  *      Kevin Hilman
   9  */
  10
  11 #ifndef __DRIVER_OPP_H__
  12 #define __DRIVER_OPP_H__
  13
  14 #include <linux/device.h>
  15 #include <linux/interconnect.h>
  16 #include <linux/kernel.h>
  17 #include <linux/kref.h>
  18 #include <linux/list.h>
  19 #include <linux/limits.h>
  20 #include <linux/pm_opp.h>
  21 #include <linux/notifier.h>
  22
  23 struct clk;
  24 struct regulator;
  25
  26 /* Lock to allow exclusive modification to the device and opp lists */
  27 extern struct mutex opp_table_lock;
  28
  29 extern struct list_head opp_tables;
  30
  31 /* OPP Config flags */
  32 #define OPP_CONFIG_CLK                  BIT(0)
  33 #define OPP_CONFIG_REGULATOR            BIT(1)
  34 #define OPP_CONFIG_REGULATOR_HELPER     BIT(2)
  35 #define OPP_CONFIG_PROP_NAME            BIT(3)
  36 #define OPP_CONFIG_SUPPORTED_HW         BIT(4)
  37 #define OPP_CONFIG_REQUIRED_DEV         BIT(5)
  38
  39 /**
  40  * struct opp_config_data - data for set config operations
  41  * @opp_table: OPP table
  42  * @flags: OPP config flags
  43  * @required_dev_index: The position in the array of required_devs
  44  *
  45  * This structure stores the OPP config information for each OPP table
  46  * configuration by the callers.
  47  */
  48 struct opp_config_data {
  49         struct opp_table *opp_table;
  50         unsigned int flags;
  51         unsigned int required_dev_index;
  52 };
  53
  54 /**
  55  * struct dev_pm_opp_icc_bw - Interconnect bandwidth values
  56  * @avg:        Average bandwidth corresponding to this OPP (in icc units)
  57  * @peak:       Peak bandwidth corresponding to this OPP (in icc units)
  58  *
  59  * This structure stores the bandwidth values for a single interconnect path.
  60  */
  61 struct dev_pm_opp_icc_bw {
  62         u32 avg;
  63         u32 peak;
  64 };
  65
  66 /*
  67  * Internal data structure organization with the OPP layer library is as
  68  * follows:
  69  * opp_tables (root)
  70  *      |- device 1 (represents voltage domain 1)
  71  *      |       |- opp 1 (availability, freq, voltage)
  72  *      |       |- opp 2 ..
  73  *      ...     ...
  74  *      |       `- opp n ..
  75  *      |- device 2 (represents the next voltage domain)
  76  *      ...
  77  *      `- device m (represents mth voltage domain)
  78  * device 1, 2.. are represented by opp_table structure while each opp
  79  * is represented by the opp structure.
  80  */
  81
  82 /**
  83  * struct dev_pm_opp - Generic OPP description structure
  84  * @node:       opp table node. The nodes are maintained throughout the lifetime
  85  *              of boot. It is expected only an optimal set of OPPs are
  86  *              added to the library by the SoC framework.
  87  *              IMPORTANT: the opp nodes should be maintained in increasing
  88  *              order.
  89  * @kref:       for reference count of the OPP.
  90  * @available:  true/false - marks if this OPP as available or not
  91  * @dynamic:    not-created from static DT entries.
  92  * @turbo:      true if turbo (boost) OPP
  93  * @suspend:    true if suspend OPP
  94  * @removed:    flag indicating that OPP's reference is dropped by OPP core.
  95  * @rates:      Frequencies in hertz
  96  * @level:      Performance level
  97  * @supplies:   Power supplies voltage/current values
  98  * @bandwidth:  Interconnect bandwidth values
  99  * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
 100  *              frequency from any other OPP's frequency.
 101  * @required_opps: List of OPPs that are required by this OPP.
 102  * @opp_table:  points back to the opp_table struct this opp belongs to
 103  * @np:         OPP's device node.
 104  * @dentry:     debugfs dentry pointer (per opp)
 105  *
 106  * This structure stores the OPP information for a given device.
 107  */
 108 struct dev_pm_opp {
 109         struct list_head node;
 110         struct kref kref;
 111
 112         bool available;
 113         bool dynamic;
 114         bool turbo;
 115         bool suspend;
 116         bool removed;
 117         unsigned long *rates;
 118         unsigned int level;
 119
 120         struct dev_pm_opp_supply *supplies;
 121         struct dev_pm_opp_icc_bw *bandwidth;
 122
 123         unsigned long clock_latency_ns;
 124
 125         struct dev_pm_opp **required_opps;
 126         struct opp_table *opp_table;
 127
 128         struct device_node *np;
 129
 130 #ifdef CONFIG_DEBUG_FS
 131         struct dentry *dentry;
 132         const char *of_name;
 133 #endif
 134 };
 135
 136 /**
 137  * struct opp_device - devices managed by 'struct opp_table'
 138  * @node:       list node
 139  * @dev:        device to which the struct object belongs
 140  * @dentry:     debugfs dentry pointer (per device)
 141  *
 142  * This is an internal data structure maintaining the devices that are managed
 143  * by 'struct opp_table'.
 144  */
 145 struct opp_device {
 146         struct list_head node;
 147         const struct device *dev;
 148
 149 #ifdef CONFIG_DEBUG_FS
 150         struct dentry *dentry;
 151 #endif
 152 };
 153
 154 enum opp_table_access {
 155         OPP_TABLE_ACCESS_UNKNOWN = 0,
 156         OPP_TABLE_ACCESS_EXCLUSIVE = 1,
 157         OPP_TABLE_ACCESS_SHARED = 2,
 158 };
 159
 160 /**
 161  * struct opp_table - Device opp structure
 162  * @node:       table node - contains the devices with OPPs that
 163  *              have been registered. Nodes once added are not modified in this
 164  *              table.
 165  * @head:       notifier head to notify the OPP availability changes.
 166  * @dev_list:   list of devices that share these OPPs
 167  * @opp_list:   table of opps
 168  * @kref:       for reference count of the table.
 169  * @lock:       mutex protecting the opp_list and dev_list.
 170  * @np:         struct device_node pointer for opp's DT node.
 171  * @clock_latency_ns_max: Max clock latency in nanoseconds.
 172  * @parsed_static_opps: Count of devices for which OPPs are initialized from DT.
 173  * @shared_opp: OPP is shared between multiple devices.
 174  * @current_rate_single_clk: Currently configured frequency for single clk.
 175  * @current_opp: Currently configured OPP for the table.
 176  * @suspend_opp: Pointer to OPP to be used during device suspend.
 177  * @required_opp_tables: List of device OPP tables that are required by OPPs in
 178  *              this table.
 179  * @required_devs: List of devices for required OPP tables.
 180  * @required_opp_count: Number of required devices.
 181  * @supported_hw: Array of version number to support.
 182  * @supported_hw_count: Number of elements in supported_hw array.
 183  * @prop_name: A name to postfix to many DT properties, while parsing them.
 184  * @config_clks: Platform specific config_clks() callback.
 185  * @clks: Device's clock handles, for multiple clocks.
 186  * @clk: Device's clock handle, for single clock.
 187  * @clk_count: Number of clocks.
 188  * @config_regulators: Platform specific config_regulators() callback.
 189  * @regulators: Supply regulators
 190  * @regulator_count: Number of power supply regulators. Its value can be -1
 191  * (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
 192  * property).
 193  * @paths: Interconnect path handles
 194  * @path_count: Number of interconnect paths
 195  * @enabled: Set to true if the device's resources are enabled/configured.
 196  * @is_genpd: Marks if the OPP table belongs to a genpd.
 197  * @dentry:     debugfs dentry pointer of the real device directory (not links).
 198  * @dentry_name: Name of the real dentry.
 199  *
 200  * @voltage_tolerance_v1: In percentage, for v1 bindings only.
 201  *
 202  * This is an internal data structure maintaining the link to opps attached to
 203  * a device. This structure is not meant to be shared to users as it is
 204  * meant for book keeping and private to OPP library.
 205  */
 206 struct opp_table {
 207         struct list_head node, lazy;
 208
 209         struct blocking_notifier_head head;
 210         struct list_head dev_list;
 211         struct list_head opp_list;
 212         struct kref kref;
 213         struct mutex lock;
 214
 215         struct device_node *np;
 216         unsigned long clock_latency_ns_max;
 217
 218         /* For backward compatibility with v1 bindings */
 219         unsigned int voltage_tolerance_v1;
 220
 221         unsigned int parsed_static_opps;
 222         enum opp_table_access shared_opp;
 223         unsigned long current_rate_single_clk;
 224         struct dev_pm_opp *current_opp;
 225         struct dev_pm_opp *suspend_opp;
 226
 227         struct opp_table **required_opp_tables;
 228         struct device **required_devs;
 229         unsigned int required_opp_count;
 230
 231         unsigned int *supported_hw;
 232         unsigned int supported_hw_count;
 233         const char *prop_name;
 234         config_clks_t config_clks;
 235         struct clk **clks;
 236         struct clk *clk;
 237         int clk_count;
 238         config_regulators_t config_regulators;
 239         struct regulator **regulators;
 240         int regulator_count;
 241         struct icc_path **paths;
 242         unsigned int path_count;
 243         bool enabled;
 244         bool is_genpd;
 245
 246 #ifdef CONFIG_DEBUG_FS
 247         struct dentry *dentry;
 248         char dentry_name[NAME_MAX];
 249 #endif
 250 };
 251
 252 /* Routines internal to opp core */
 253 void dev_pm_opp_get(struct dev_pm_opp *opp);
 254 bool _opp_remove_all_static(struct opp_table *opp_table);
 255 void _get_opp_table_kref(struct opp_table *opp_table);
 256 int _get_opp_count(struct opp_table *opp_table);
 257 struct opp_table *_find_opp_table(struct device *dev);
 258 struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
 259 struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
 260 void _opp_free(struct dev_pm_opp *opp);
 261 int _opp_compare_key(struct opp_table *opp_table, struct dev_pm_opp *opp1, struct dev_pm_opp *opp2);
 262 int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table);
 263 int _opp_add_v1(struct opp_table *opp_table, struct device *dev, struct dev_pm_opp_data *data, bool dynamic);
 264 void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu);
 265 struct opp_table *_add_opp_table_indexed(struct device *dev, int index, bool getclk);
 266 void _required_opps_available(struct dev_pm_opp *opp, int count);
 267
 268 static inline bool lazy_linking_pending(struct opp_table *opp_table)
 269 {
 270         return unlikely(!list_empty(&opp_table->lazy));
 271 }
 272
 273 #ifdef CONFIG_OF
 274 void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index);
 275 void _of_clear_opp_table(struct opp_table *opp_table);
 276 struct opp_table *_managed_opp(struct device *dev, int index);
 277 void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp);
 278 #else
 279 static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {}
 280 static inline void _of_clear_opp_table(struct opp_table *opp_table) {}
 281 static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; }
 282 static inline void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp) {}
 283 #endif
 284
 285 #ifdef CONFIG_DEBUG_FS
 286 void opp_debug_remove_one(struct dev_pm_opp *opp);
 287 void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
 288 void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
 289 void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
 290 #else
 291 static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
 292
 293 static inline void opp_debug_create_one(struct dev_pm_opp *opp,
 294                                         struct opp_table *opp_table) { }
 295
 296 static inline void opp_debug_register(struct opp_device *opp_dev,
 297                                       struct opp_table *opp_table) { }
 298
 299 static inline void opp_debug_unregister(struct opp_device *opp_dev,
 300                                         struct opp_table *opp_table)
 301 { }
 302 #endif          /* DEBUG_FS */
 303
 304 #endif          /* __DRIVER_OPP_H__ */