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 /* 32 * Internal data structure organization with the OPP layer library is as 33 * follows: 34 * opp_tables (root) 35 * |- device 1 (represents voltage domain 1) 36 * | |- opp 1 (availability, freq, voltage) 37 * | |- opp 2 .. 38 * ... ... 39 * | `- opp n .. 40 * |- device 2 (represents the next voltage domain) 41 * ... 42 * `- device m (represents mth voltage domain) 43 * device 1, 2.. are represented by opp_table structure while each opp 44 * is represented by the opp structure. 45 */ 46 47 /** 48 * struct dev_pm_opp - Generic OPP description structure 49 * @node: opp table node. The nodes are maintained throughout the lifetime 50 * of boot. It is expected only an optimal set of OPPs are 51 * added to the library by the SoC framework. 52 * IMPORTANT: the opp nodes should be maintained in increasing 53 * order. 54 * @kref: for reference count of the OPP. 55 * @available: true/false - marks if this OPP as available or not 56 * @dynamic: not-created from static DT entries. 57 * @turbo: true if turbo (boost) OPP 58 * @suspend: true if suspend OPP 59 * @pstate: Device's power domain's performance state. 60 * @rate: Frequency in hertz 61 * @level: Performance level 62 * @supplies: Power supplies voltage/current values 63 * @bandwidth: Interconnect bandwidth values 64 * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's 65 * frequency from any other OPP's frequency. 66 * @required_opps: List of OPPs that are required by this OPP. 67 * @opp_table: points back to the opp_table struct this opp belongs to 68 * @np: OPP's device node. 69 * @dentry: debugfs dentry pointer (per opp) 70 * 71 * This structure stores the OPP information for a given device. 72 */ 73 struct dev_pm_opp { 74 struct list_head node; 75 struct kref kref; 76 77 bool available; 78 bool dynamic; 79 bool turbo; 80 bool suspend; 81 unsigned int pstate; 82 unsigned long rate; 83 unsigned int level; 84 85 struct dev_pm_opp_supply *supplies; 86 struct dev_pm_opp_icc_bw *bandwidth; 87 88 unsigned long clock_latency_ns; 89 90 struct dev_pm_opp **required_opps; 91 struct opp_table *opp_table; 92 93 struct device_node *np; 94 95 #ifdef CONFIG_DEBUG_FS 96 struct dentry *dentry; 97 #endif 98 }; 99 100 /** 101 * struct opp_device - devices managed by 'struct opp_table' 102 * @node: list node 103 * @dev: device to which the struct object belongs 104 * @dentry: debugfs dentry pointer (per device) 105 * 106 * This is an internal data structure maintaining the devices that are managed 107 * by 'struct opp_table'. 108 */ 109 struct opp_device { 110 struct list_head node; 111 const struct device *dev; 112 113 #ifdef CONFIG_DEBUG_FS 114 struct dentry *dentry; 115 #endif 116 }; 117 118 enum opp_table_access { 119 OPP_TABLE_ACCESS_UNKNOWN = 0, 120 OPP_TABLE_ACCESS_EXCLUSIVE = 1, 121 OPP_TABLE_ACCESS_SHARED = 2, 122 }; 123 124 /** 125 * struct opp_table - Device opp structure 126 * @node: table node - contains the devices with OPPs that 127 * have been registered. Nodes once added are not modified in this 128 * table. 129 * @head: notifier head to notify the OPP availability changes. 130 * @dev_list: list of devices that share these OPPs 131 * @opp_list: table of opps 132 * @kref: for reference count of the table. 133 * @lock: mutex protecting the opp_list and dev_list. 134 * @np: struct device_node pointer for opp's DT node. 135 * @clock_latency_ns_max: Max clock latency in nanoseconds. 136 * @parsed_static_opps: Count of devices for which OPPs are initialized from DT. 137 * @shared_opp: OPP is shared between multiple devices. 138 * @suspend_opp: Pointer to OPP to be used during device suspend. 139 * @genpd_virt_dev_lock: Mutex protecting the genpd virtual device pointers. 140 * @genpd_virt_devs: List of virtual devices for multiple genpd support. 141 * @required_opp_tables: List of device OPP tables that are required by OPPs in 142 * this table. 143 * @required_opp_count: Number of required devices. 144 * @supported_hw: Array of version number to support. 145 * @supported_hw_count: Number of elements in supported_hw array. 146 * @prop_name: A name to postfix to many DT properties, while parsing them. 147 * @clk: Device's clock handle 148 * @regulators: Supply regulators 149 * @regulator_count: Number of power supply regulators. Its value can be -1 150 * @regulator_enabled: Set to true if regulators were previously enabled. 151 * (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt 152 * property). 153 * @paths: Interconnect path handles 154 * @path_count: Number of interconnect paths 155 * @genpd_performance_state: Device's power domain support performance state. 156 * @is_genpd: Marks if the OPP table belongs to a genpd. 157 * @set_opp: Platform specific set_opp callback 158 * @set_opp_data: Data to be passed to set_opp callback 159 * @dentry: debugfs dentry pointer of the real device directory (not links). 160 * @dentry_name: Name of the real dentry. 161 * 162 * @voltage_tolerance_v1: In percentage, for v1 bindings only. 163 * 164 * This is an internal data structure maintaining the link to opps attached to 165 * a device. This structure is not meant to be shared to users as it is 166 * meant for book keeping and private to OPP library. 167 */ 168 struct opp_table { 169 struct list_head node; 170 171 struct blocking_notifier_head head; 172 struct list_head dev_list; 173 struct list_head opp_list; 174 struct kref kref; 175 struct mutex lock; 176 177 struct device_node *np; 178 unsigned long clock_latency_ns_max; 179 180 /* For backward compatibility with v1 bindings */ 181 unsigned int voltage_tolerance_v1; 182 183 unsigned int parsed_static_opps; 184 enum opp_table_access shared_opp; 185 struct dev_pm_opp *suspend_opp; 186 187 struct mutex genpd_virt_dev_lock; 188 struct device **genpd_virt_devs; 189 struct opp_table **required_opp_tables; 190 unsigned int required_opp_count; 191 192 unsigned int *supported_hw; 193 unsigned int supported_hw_count; 194 const char *prop_name; 195 struct clk *clk; 196 struct regulator **regulators; 197 int regulator_count; 198 bool regulator_enabled; 199 struct icc_path **paths; 200 unsigned int path_count; 201 bool genpd_performance_state; 202 bool is_genpd; 203 204 int (*set_opp)(struct dev_pm_set_opp_data *data); 205 struct dev_pm_set_opp_data *set_opp_data; 206 207 #ifdef CONFIG_DEBUG_FS 208 struct dentry *dentry; 209 char dentry_name[NAME_MAX]; 210 #endif 211 }; 212 213 /* Routines internal to opp core */ 214 void dev_pm_opp_get(struct dev_pm_opp *opp); 215 bool _opp_remove_all_static(struct opp_table *opp_table); 216 void _get_opp_table_kref(struct opp_table *opp_table); 217 int _get_opp_count(struct opp_table *opp_table); 218 struct opp_table *_find_opp_table(struct device *dev); 219 struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table); 220 void _dev_pm_opp_find_and_remove_table(struct device *dev); 221 struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table); 222 void _opp_free(struct dev_pm_opp *opp); 223 int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2); 224 int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available); 225 int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic); 226 void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu); 227 struct opp_table *_add_opp_table(struct device *dev); 228 void _put_opp_list_kref(struct opp_table *opp_table); 229 230 #ifdef CONFIG_OF 231 void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index); 232 void _of_clear_opp_table(struct opp_table *opp_table); 233 struct opp_table *_managed_opp(struct device *dev, int index); 234 void _of_opp_free_required_opps(struct opp_table *opp_table, 235 struct dev_pm_opp *opp); 236 #else 237 static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {} 238 static inline void _of_clear_opp_table(struct opp_table *opp_table) {} 239 static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; } 240 static inline void _of_opp_free_required_opps(struct opp_table *opp_table, 241 struct dev_pm_opp *opp) {} 242 #endif 243 244 #ifdef CONFIG_DEBUG_FS 245 void opp_debug_remove_one(struct dev_pm_opp *opp); 246 void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table); 247 void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table); 248 void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table); 249 #else 250 static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {} 251 252 static inline void opp_debug_create_one(struct dev_pm_opp *opp, 253 struct opp_table *opp_table) { } 254 255 static inline void opp_debug_register(struct opp_device *opp_dev, 256 struct opp_table *opp_table) { } 257 258 static inline void opp_debug_unregister(struct opp_device *opp_dev, 259 struct opp_table *opp_table) 260 { } 261 #endif /* DEBUG_FS */ 262 263 #endif /* __DRIVER_OPP_H__ */ 264