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f59d3ee8 VK |
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 __DRIVER_OPP_H__ | |
15 | #define __DRIVER_OPP_H__ | |
16 | ||
17 | #include <linux/device.h> | |
18 | #include <linux/kernel.h> | |
7034764a | 19 | #include <linux/kref.h> |
f59d3ee8 | 20 | #include <linux/list.h> |
deaa5146 | 21 | #include <linux/limits.h> |
f59d3ee8 | 22 | #include <linux/pm_opp.h> |
052c6f19 | 23 | #include <linux/notifier.h> |
f59d3ee8 | 24 | |
d54974c2 | 25 | struct clk; |
9f8ea969 VK |
26 | struct regulator; |
27 | ||
87b4115d | 28 | /* Lock to allow exclusive modification to the device and opp lists */ |
2c2709dc | 29 | extern struct mutex opp_table_lock; |
87b4115d | 30 | |
f47b72a1 VK |
31 | extern struct list_head opp_tables; |
32 | ||
f59d3ee8 VK |
33 | /* |
34 | * Internal data structure organization with the OPP layer library is as | |
35 | * follows: | |
2c2709dc | 36 | * opp_tables (root) |
f59d3ee8 VK |
37 | * |- device 1 (represents voltage domain 1) |
38 | * | |- opp 1 (availability, freq, voltage) | |
39 | * | |- opp 2 .. | |
40 | * ... ... | |
41 | * | `- opp n .. | |
42 | * |- device 2 (represents the next voltage domain) | |
43 | * ... | |
44 | * `- device m (represents mth voltage domain) | |
2c2709dc | 45 | * device 1, 2.. are represented by opp_table structure while each opp |
f59d3ee8 VK |
46 | * is represented by the opp structure. |
47 | */ | |
48 | ||
49 | /** | |
50 | * struct dev_pm_opp - Generic OPP description structure | |
2c2709dc | 51 | * @node: opp table node. The nodes are maintained throughout the lifetime |
f59d3ee8 VK |
52 | * of boot. It is expected only an optimal set of OPPs are |
53 | * added to the library by the SoC framework. | |
f59d3ee8 VK |
54 | * IMPORTANT: the opp nodes should be maintained in increasing |
55 | * order. | |
7034764a | 56 | * @kref: for reference count of the OPP. |
f59d3ee8 | 57 | * @available: true/false - marks if this OPP as available or not |
dc4e7b1f | 58 | * @dynamic: not-created from static DT entries. |
f59d3ee8 | 59 | * @turbo: true if turbo (boost) OPP |
deaa5146 | 60 | * @suspend: true if suspend OPP |
009acd19 | 61 | * @pstate: Device's power domain's performance state. |
f59d3ee8 | 62 | * @rate: Frequency in hertz |
dfbe4678 | 63 | * @supplies: Power supplies voltage/current values |
f59d3ee8 VK |
64 | * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's |
65 | * frequency from any other OPP's frequency. | |
2c2709dc | 66 | * @opp_table: points back to the opp_table struct this opp belongs to |
f59d3ee8 | 67 | * @np: OPP's device node. |
deaa5146 | 68 | * @dentry: debugfs dentry pointer (per opp) |
f59d3ee8 VK |
69 | * |
70 | * This structure stores the OPP information for a given device. | |
71 | */ | |
72 | struct dev_pm_opp { | |
73 | struct list_head node; | |
7034764a | 74 | struct kref kref; |
f59d3ee8 VK |
75 | |
76 | bool available; | |
77 | bool dynamic; | |
78 | bool turbo; | |
deaa5146 | 79 | bool suspend; |
009acd19 | 80 | unsigned int pstate; |
f59d3ee8 VK |
81 | unsigned long rate; |
82 | ||
dfbe4678 | 83 | struct dev_pm_opp_supply *supplies; |
0f0fe7e0 | 84 | |
f59d3ee8 VK |
85 | unsigned long clock_latency_ns; |
86 | ||
2c2709dc | 87 | struct opp_table *opp_table; |
f59d3ee8 VK |
88 | |
89 | struct device_node *np; | |
deaa5146 VK |
90 | |
91 | #ifdef CONFIG_DEBUG_FS | |
92 | struct dentry *dentry; | |
93 | #endif | |
f59d3ee8 VK |
94 | }; |
95 | ||
96 | /** | |
2c2709dc | 97 | * struct opp_device - devices managed by 'struct opp_table' |
f59d3ee8 VK |
98 | * @node: list node |
99 | * @dev: device to which the struct object belongs | |
deaa5146 | 100 | * @dentry: debugfs dentry pointer (per device) |
f59d3ee8 | 101 | * |
2c2709dc VK |
102 | * This is an internal data structure maintaining the devices that are managed |
103 | * by 'struct opp_table'. | |
f59d3ee8 | 104 | */ |
2c2709dc | 105 | struct opp_device { |
f59d3ee8 VK |
106 | struct list_head node; |
107 | const struct device *dev; | |
deaa5146 VK |
108 | |
109 | #ifdef CONFIG_DEBUG_FS | |
110 | struct dentry *dentry; | |
111 | #endif | |
f59d3ee8 VK |
112 | }; |
113 | ||
79ee2e8f VK |
114 | enum opp_table_access { |
115 | OPP_TABLE_ACCESS_UNKNOWN = 0, | |
116 | OPP_TABLE_ACCESS_EXCLUSIVE = 1, | |
117 | OPP_TABLE_ACCESS_SHARED = 2, | |
118 | }; | |
119 | ||
f59d3ee8 | 120 | /** |
2c2709dc VK |
121 | * struct opp_table - Device opp structure |
122 | * @node: table node - contains the devices with OPPs that | |
f59d3ee8 | 123 | * have been registered. Nodes once added are not modified in this |
2c2709dc | 124 | * table. |
052c6f19 | 125 | * @head: notifier head to notify the OPP availability changes. |
f59d3ee8 | 126 | * @dev_list: list of devices that share these OPPs |
2c2709dc | 127 | * @opp_list: table of opps |
f067a982 | 128 | * @kref: for reference count of the table. |
d0e8ae6c | 129 | * @list_kref: for reference count of the OPP list. |
3d255699 | 130 | * @lock: mutex protecting the opp_list and dev_list. |
f59d3ee8 | 131 | * @np: struct device_node pointer for opp's DT node. |
dc4e7b1f | 132 | * @clock_latency_ns_max: Max clock latency in nanoseconds. |
f06ed90e | 133 | * @parsed_static_opps: True if OPPs are initialized from DT. |
f59d3ee8 | 134 | * @shared_opp: OPP is shared between multiple devices. |
dc4e7b1f | 135 | * @suspend_opp: Pointer to OPP to be used during device suspend. |
7de36b0a VK |
136 | * @supported_hw: Array of version number to support. |
137 | * @supported_hw_count: Number of elements in supported_hw array. | |
01fb4d3c | 138 | * @prop_name: A name to postfix to many DT properties, while parsing them. |
d54974c2 | 139 | * @clk: Device's clock handle |
dfbe4678 VK |
140 | * @regulators: Supply regulators |
141 | * @regulator_count: Number of power supply regulators | |
009acd19 | 142 | * @genpd_performance_state: Device's power domain support performance state. |
4dab160e | 143 | * @set_opp: Platform specific set_opp callback |
94735585 | 144 | * @set_opp_data: Data to be passed to set_opp callback |
deaa5146 VK |
145 | * @dentry: debugfs dentry pointer of the real device directory (not links). |
146 | * @dentry_name: Name of the real dentry. | |
f59d3ee8 | 147 | * |
50f8cfbd VK |
148 | * @voltage_tolerance_v1: In percentage, for v1 bindings only. |
149 | * | |
f59d3ee8 VK |
150 | * This is an internal data structure maintaining the link to opps attached to |
151 | * a device. This structure is not meant to be shared to users as it is | |
152 | * meant for book keeping and private to OPP library. | |
f59d3ee8 | 153 | */ |
2c2709dc | 154 | struct opp_table { |
f59d3ee8 VK |
155 | struct list_head node; |
156 | ||
052c6f19 | 157 | struct blocking_notifier_head head; |
f59d3ee8 VK |
158 | struct list_head dev_list; |
159 | struct list_head opp_list; | |
f067a982 | 160 | struct kref kref; |
d0e8ae6c | 161 | struct kref list_kref; |
37a73ec0 | 162 | struct mutex lock; |
f59d3ee8 VK |
163 | |
164 | struct device_node *np; | |
165 | unsigned long clock_latency_ns_max; | |
50f8cfbd VK |
166 | |
167 | /* For backward compatibility with v1 bindings */ | |
168 | unsigned int voltage_tolerance_v1; | |
169 | ||
f06ed90e | 170 | bool parsed_static_opps; |
79ee2e8f | 171 | enum opp_table_access shared_opp; |
f59d3ee8 | 172 | struct dev_pm_opp *suspend_opp; |
deaa5146 | 173 | |
7de36b0a VK |
174 | unsigned int *supported_hw; |
175 | unsigned int supported_hw_count; | |
01fb4d3c | 176 | const char *prop_name; |
d54974c2 | 177 | struct clk *clk; |
dfbe4678 VK |
178 | struct regulator **regulators; |
179 | unsigned int regulator_count; | |
009acd19 | 180 | bool genpd_performance_state; |
7de36b0a | 181 | |
4dab160e | 182 | int (*set_opp)(struct dev_pm_set_opp_data *data); |
94735585 VK |
183 | struct dev_pm_set_opp_data *set_opp_data; |
184 | ||
deaa5146 VK |
185 | #ifdef CONFIG_DEBUG_FS |
186 | struct dentry *dentry; | |
187 | char dentry_name[NAME_MAX]; | |
188 | #endif | |
f59d3ee8 VK |
189 | }; |
190 | ||
191 | /* Routines internal to opp core */ | |
a88bd2a5 | 192 | void dev_pm_opp_get(struct dev_pm_opp *opp); |
cdd6ed90 | 193 | void _opp_remove_all_static(struct opp_table *opp_table); |
f067a982 | 194 | void _get_opp_table_kref(struct opp_table *opp_table); |
a1e8c136 | 195 | int _get_opp_count(struct opp_table *opp_table); |
2c2709dc VK |
196 | struct opp_table *_find_opp_table(struct device *dev); |
197 | struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table); | |
2a4eb735 | 198 | void _dev_pm_opp_find_and_remove_table(struct device *dev); |
8cd2f6e8 VK |
199 | struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table); |
200 | void _opp_free(struct dev_pm_opp *opp); | |
a1e8c136 | 201 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available); |
8cd2f6e8 | 202 | int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic); |
2a4eb735 | 203 | void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu); |
8cd2f6e8 | 204 | struct opp_table *_add_opp_table(struct device *dev); |
d0e8ae6c | 205 | void _put_opp_list_kref(struct opp_table *opp_table); |
f47b72a1 VK |
206 | |
207 | #ifdef CONFIG_OF | |
eb7c8743 | 208 | void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index); |
283d55e6 | 209 | struct opp_table *_managed_opp(struct device *dev, int index); |
f47b72a1 | 210 | #else |
eb7c8743 | 211 | static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {} |
283d55e6 | 212 | static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; } |
f47b72a1 | 213 | #endif |
f59d3ee8 | 214 | |
deaa5146 VK |
215 | #ifdef CONFIG_DEBUG_FS |
216 | void opp_debug_remove_one(struct dev_pm_opp *opp); | |
2c2709dc VK |
217 | int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table); |
218 | int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table); | |
219 | void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table); | |
deaa5146 VK |
220 | #else |
221 | static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {} | |
222 | ||
223 | static inline int opp_debug_create_one(struct dev_pm_opp *opp, | |
2c2709dc | 224 | struct opp_table *opp_table) |
deaa5146 | 225 | { return 0; } |
2c2709dc VK |
226 | static inline int opp_debug_register(struct opp_device *opp_dev, |
227 | struct opp_table *opp_table) | |
deaa5146 VK |
228 | { return 0; } |
229 | ||
2c2709dc VK |
230 | static inline void opp_debug_unregister(struct opp_device *opp_dev, |
231 | struct opp_table *opp_table) | |
deaa5146 VK |
232 | { } |
233 | #endif /* DEBUG_FS */ | |
234 | ||
f59d3ee8 | 235 | #endif /* __DRIVER_OPP_H__ */ |