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/kernel.h>
  16 #include <linux/kref.h>
  17 #include <linux/list.h>
  18 #include <linux/limits.h>
  19 #include <linux/pm_opp.h>
  20 #include <linux/notifier.h>
  21
  22 struct clk;
  23 struct regulator;
  24
  25 /* Lock to allow exclusive modification to the device and opp lists */
  26 extern struct mutex opp_table_lock;
  27
  28 extern struct list_head opp_tables;
  29
  30 /*
  31  * Internal data structure organization with the OPP layer library is as
  32  * follows:
  33  * opp_tables (root)
  34  *      |- device 1 (represents voltage domain 1)
  35  *      |       |- opp 1 (availability, freq, voltage)
  36  *      |       |- opp 2 ..
  37  *      ...     ...
  38  *      |       `- opp n ..
  39  *      |- device 2 (represents the next voltage domain)
  40  *      ...
  41  *      `- device m (represents mth voltage domain)
  42  * device 1, 2.. are represented by opp_table structure while each opp
  43  * is represented by the opp structure.
  44  */
  45
  46 /**
  47  * struct dev_pm_opp - Generic OPP description structure
  48  * @node:       opp table node. The nodes are maintained throughout the lifetime
  49  *              of boot. It is expected only an optimal set of OPPs are
  50  *              added to the library by the SoC framework.
  51  *              IMPORTANT: the opp nodes should be maintained in increasing
  52  *              order.
  53  * @kref:       for reference count of the OPP.
  54  * @available:  true/false - marks if this OPP as available or not
  55  * @dynamic:    not-created from static DT entries.
  56  * @turbo:      true if turbo (boost) OPP
  57  * @suspend:    true if suspend OPP
  58  * @pstate: Device's power domain's performance state.
  59  * @rate:       Frequency in hertz
  60  * @level:      Performance level
  61  * @supplies:   Power supplies voltage/current values
  62  * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
  63  *              frequency from any other OPP's frequency.
  64  * @required_opps: List of OPPs that are required by this OPP.
  65  * @opp_table:  points back to the opp_table struct this opp belongs to
  66  * @np:         OPP's device node.
  67  * @dentry:     debugfs dentry pointer (per opp)
  68  *
  69  * This structure stores the OPP information for a given device.
  70  */
  71 struct dev_pm_opp {
  72         struct list_head node;
  73         struct kref kref;
  74
  75         bool available;
  76         bool dynamic;
  77         bool turbo;
  78         bool suspend;
  79         unsigned int pstate;
  80         unsigned long rate;
  81         unsigned int level;
  82
  83         struct dev_pm_opp_supply *supplies;
  84
  85         unsigned long clock_latency_ns;
  86
  87         struct dev_pm_opp **required_opps;
  88         struct opp_table *opp_table;
  89
  90         struct device_node *np;
  91
  92 #ifdef CONFIG_DEBUG_FS
  93         struct dentry *dentry;
  94 #endif
  95 };
  96
  97 /**
  98  * struct opp_device - devices managed by 'struct opp_table'
  99  * @node:       list node
 100  * @dev:        device to which the struct object belongs
 101  * @dentry:     debugfs dentry pointer (per device)
 102  *
 103  * This is an internal data structure maintaining the devices that are managed
 104  * by 'struct opp_table'.
 105  */
 106 struct opp_device {
 107         struct list_head node;
 108         const struct device *dev;
 109
 110 #ifdef CONFIG_DEBUG_FS
 111         struct dentry *dentry;
 112 #endif
 113 };
 114
 115 enum opp_table_access {
 116         OPP_TABLE_ACCESS_UNKNOWN = 0,
 117         OPP_TABLE_ACCESS_EXCLUSIVE = 1,
 118         OPP_TABLE_ACCESS_SHARED = 2,
 119 };
 120
 121 /**
 122  * struct opp_table - Device opp structure
 123  * @node:       table node - contains the devices with OPPs that
 124  *              have been registered. Nodes once added are not modified in this
 125  *              table.
 126  * @head:       notifier head to notify the OPP availability changes.
 127  * @dev_list:   list of devices that share these OPPs
 128  * @opp_list:   table of opps
 129  * @kref:       for reference count of the table.
 130  * @lock:       mutex protecting the opp_list and dev_list.
 131  * @np:         struct device_node pointer for opp's DT node.
 132  * @clock_latency_ns_max: Max clock latency in nanoseconds.
 133  * @parsed_static_opps: Count of devices for which OPPs are initialized from DT.
 134  * @shared_opp: OPP is shared between multiple devices.
 135  * @suspend_opp: Pointer to OPP to be used during device suspend.
 136  * @genpd_virt_dev_lock: Mutex protecting the genpd virtual device pointers.
 137  * @genpd_virt_devs: List of virtual devices for multiple genpd support.
 138  * @required_opp_tables: List of device OPP tables that are required by OPPs in
 139  *              this table.
 140  * @required_opp_count: Number of required devices.
 141  * @supported_hw: Array of version number to support.
 142  * @supported_hw_count: Number of elements in supported_hw array.
 143  * @prop_name: A name to postfix to many DT properties, while parsing them.
 144  * @clk: Device's clock handle
 145  * @regulators: Supply regulators
 146  * @regulator_count: Number of power supply regulators. Its value can be -1
 147  * (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
 148  * property).
 149  * @genpd_performance_state: Device's power domain support performance state.
 150  * @is_genpd: Marks if the OPP table belongs to a genpd.
 151  * @set_opp: Platform specific set_opp callback
 152  * @set_opp_data: Data to be passed to set_opp callback
 153  * @dentry:     debugfs dentry pointer of the real device directory (not links).
 154  * @dentry_name: Name of the real dentry.
 155  *
 156  * @voltage_tolerance_v1: In percentage, for v1 bindings only.
 157  *
 158  * This is an internal data structure maintaining the link to opps attached to
 159  * a device. This structure is not meant to be shared to users as it is
 160  * meant for book keeping and private to OPP library.
 161  */
 162 struct opp_table {
 163         struct list_head node;
 164
 165         struct blocking_notifier_head head;
 166         struct list_head dev_list;
 167         struct list_head opp_list;
 168         struct kref kref;
 169         struct mutex lock;
 170
 171         struct device_node *np;
 172         unsigned long clock_latency_ns_max;
 173
 174         /* For backward compatibility with v1 bindings */
 175         unsigned int voltage_tolerance_v1;
 176
 177         unsigned int parsed_static_opps;
 178         enum opp_table_access shared_opp;
 179         struct dev_pm_opp *suspend_opp;
 180
 181         struct mutex genpd_virt_dev_lock;
 182         struct device **genpd_virt_devs;
 183         struct opp_table **required_opp_tables;
 184         unsigned int required_opp_count;
 185
 186         unsigned int *supported_hw;
 187         unsigned int supported_hw_count;
 188         const char *prop_name;
 189         struct clk *clk;
 190         struct regulator **regulators;
 191         int regulator_count;
 192         bool genpd_performance_state;
 193         bool is_genpd;
 194
 195         int (*set_opp)(struct dev_pm_set_opp_data *data);
 196         struct dev_pm_set_opp_data *set_opp_data;
 197
 198 #ifdef CONFIG_DEBUG_FS
 199         struct dentry *dentry;
 200         char dentry_name[NAME_MAX];
 201 #endif
 202 };
 203
 204 /* Routines internal to opp core */
 205 void dev_pm_opp_get(struct dev_pm_opp *opp);
 206 void _opp_remove_all_static(struct opp_table *opp_table);
 207 void _get_opp_table_kref(struct opp_table *opp_table);
 208 int _get_opp_count(struct opp_table *opp_table);
 209 struct opp_table *_find_opp_table(struct device *dev);
 210 struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
 211 void _dev_pm_opp_find_and_remove_table(struct device *dev);
 212 struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
 213 void _opp_free(struct dev_pm_opp *opp);
 214 int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available);
 215 int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
 216 void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu);
 217 struct opp_table *_add_opp_table(struct device *dev);
 218 void _put_opp_list_kref(struct opp_table *opp_table);
 219
 220 #ifdef CONFIG_OF
 221 void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index);
 222 void _of_clear_opp_table(struct opp_table *opp_table);
 223 struct opp_table *_managed_opp(struct device *dev, int index);
 224 void _of_opp_free_required_opps(struct opp_table *opp_table,
 225                                 struct dev_pm_opp *opp);
 226 #else
 227 static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {}
 228 static inline void _of_clear_opp_table(struct opp_table *opp_table) {}
 229 static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; }
 230 static inline void _of_opp_free_required_opps(struct opp_table *opp_table,
 231                                               struct dev_pm_opp *opp) {}
 232 #endif
 233
 234 #ifdef CONFIG_DEBUG_FS
 235 void opp_debug_remove_one(struct dev_pm_opp *opp);
 236 void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
 237 void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
 238 void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
 239 #else
 240 static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
 241
 242 static inline void opp_debug_create_one(struct dev_pm_opp *opp,
 243                                         struct opp_table *opp_table) { }
 244
 245 static inline void opp_debug_register(struct opp_device *opp_dev,
 246                                       struct opp_table *opp_table) { }
 247
 248 static inline void opp_debug_unregister(struct opp_device *opp_dev,
 249                                         struct opp_table *opp_table)
 250 { }
 251 #endif          /* DEBUG_FS */
 252
 253 #endif          /* __DRIVER_OPP_H__ */