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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> | |
19 | #include <linux/list.h> | |
deaa5146 | 20 | #include <linux/limits.h> |
f59d3ee8 VK |
21 | #include <linux/pm_opp.h> |
22 | #include <linux/rculist.h> | |
23 | #include <linux/rcupdate.h> | |
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. | |
2c2709dc | 54 | * RCU usage: opp table is traversed with RCU locks. node |
f59d3ee8 | 55 | * modification is possible realtime, hence the modifications |
2c2709dc | 56 | * are protected by the opp_table_lock for integrity. |
f59d3ee8 VK |
57 | * IMPORTANT: the opp nodes should be maintained in increasing |
58 | * order. | |
f59d3ee8 | 59 | * @available: true/false - marks if this OPP as available or not |
dc4e7b1f | 60 | * @dynamic: not-created from static DT entries. |
f59d3ee8 | 61 | * @turbo: true if turbo (boost) OPP |
deaa5146 | 62 | * @suspend: true if suspend OPP |
f59d3ee8 | 63 | * @rate: Frequency in hertz |
0f0fe7e0 | 64 | * @supply: Power supply voltage/current values |
f59d3ee8 VK |
65 | * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's |
66 | * frequency from any other OPP's frequency. | |
2c2709dc | 67 | * @opp_table: points back to the opp_table struct this opp belongs to |
f59d3ee8 VK |
68 | * @rcu_head: RCU callback head used for deferred freeing |
69 | * @np: OPP's device node. | |
deaa5146 | 70 | * @dentry: debugfs dentry pointer (per opp) |
f59d3ee8 VK |
71 | * |
72 | * This structure stores the OPP information for a given device. | |
73 | */ | |
74 | struct dev_pm_opp { | |
75 | struct list_head node; | |
76 | ||
77 | bool available; | |
78 | bool dynamic; | |
79 | bool turbo; | |
deaa5146 | 80 | bool suspend; |
f59d3ee8 VK |
81 | unsigned long rate; |
82 | ||
0f0fe7e0 VK |
83 | struct dev_pm_opp_supply supply; |
84 | ||
f59d3ee8 VK |
85 | unsigned long clock_latency_ns; |
86 | ||
2c2709dc | 87 | struct opp_table *opp_table; |
f59d3ee8 VK |
88 | struct rcu_head rcu_head; |
89 | ||
90 | struct device_node *np; | |
deaa5146 VK |
91 | |
92 | #ifdef CONFIG_DEBUG_FS | |
93 | struct dentry *dentry; | |
94 | #endif | |
f59d3ee8 VK |
95 | }; |
96 | ||
97 | /** | |
2c2709dc | 98 | * struct opp_device - devices managed by 'struct opp_table' |
f59d3ee8 VK |
99 | * @node: list node |
100 | * @dev: device to which the struct object belongs | |
101 | * @rcu_head: RCU callback head used for deferred freeing | |
deaa5146 | 102 | * @dentry: debugfs dentry pointer (per device) |
f59d3ee8 | 103 | * |
2c2709dc VK |
104 | * This is an internal data structure maintaining the devices that are managed |
105 | * by 'struct opp_table'. | |
f59d3ee8 | 106 | */ |
2c2709dc | 107 | struct opp_device { |
f59d3ee8 VK |
108 | struct list_head node; |
109 | const struct device *dev; | |
110 | struct rcu_head rcu_head; | |
deaa5146 VK |
111 | |
112 | #ifdef CONFIG_DEBUG_FS | |
113 | struct dentry *dentry; | |
114 | #endif | |
f59d3ee8 VK |
115 | }; |
116 | ||
79ee2e8f VK |
117 | enum opp_table_access { |
118 | OPP_TABLE_ACCESS_UNKNOWN = 0, | |
119 | OPP_TABLE_ACCESS_EXCLUSIVE = 1, | |
120 | OPP_TABLE_ACCESS_SHARED = 2, | |
121 | }; | |
122 | ||
f59d3ee8 | 123 | /** |
2c2709dc VK |
124 | * struct opp_table - Device opp structure |
125 | * @node: table node - contains the devices with OPPs that | |
f59d3ee8 | 126 | * have been registered. Nodes once added are not modified in this |
2c2709dc VK |
127 | * table. |
128 | * RCU usage: nodes are not modified in the table of opp_table, | |
129 | * however addition is possible and is secured by opp_table_lock | |
f59d3ee8 VK |
130 | * @srcu_head: notifier head to notify the OPP availability changes. |
131 | * @rcu_head: RCU callback head used for deferred freeing | |
132 | * @dev_list: list of devices that share these OPPs | |
2c2709dc | 133 | * @opp_list: table of opps |
f59d3ee8 | 134 | * @np: struct device_node pointer for opp's DT node. |
dc4e7b1f | 135 | * @clock_latency_ns_max: Max clock latency in nanoseconds. |
f59d3ee8 | 136 | * @shared_opp: OPP is shared between multiple devices. |
dc4e7b1f | 137 | * @suspend_opp: Pointer to OPP to be used during device suspend. |
7de36b0a VK |
138 | * @supported_hw: Array of version number to support. |
139 | * @supported_hw_count: Number of elements in supported_hw array. | |
01fb4d3c | 140 | * @prop_name: A name to postfix to many DT properties, while parsing them. |
d54974c2 | 141 | * @clk: Device's clock handle |
9f8ea969 | 142 | * @regulator: Supply regulator |
deaa5146 VK |
143 | * @dentry: debugfs dentry pointer of the real device directory (not links). |
144 | * @dentry_name: Name of the real dentry. | |
f59d3ee8 | 145 | * |
50f8cfbd VK |
146 | * @voltage_tolerance_v1: In percentage, for v1 bindings only. |
147 | * | |
f59d3ee8 VK |
148 | * This is an internal data structure maintaining the link to opps attached to |
149 | * a device. This structure is not meant to be shared to users as it is | |
150 | * meant for book keeping and private to OPP library. | |
151 | * | |
152 | * Because the opp structures can be used from both rcu and srcu readers, we | |
153 | * need to wait for the grace period of both of them before freeing any | |
154 | * resources. And so we have used kfree_rcu() from within call_srcu() handlers. | |
155 | */ | |
2c2709dc | 156 | struct opp_table { |
f59d3ee8 VK |
157 | struct list_head node; |
158 | ||
159 | struct srcu_notifier_head srcu_head; | |
160 | struct rcu_head rcu_head; | |
161 | struct list_head dev_list; | |
162 | struct list_head opp_list; | |
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 | ||
79ee2e8f | 170 | enum opp_table_access shared_opp; |
f59d3ee8 | 171 | struct dev_pm_opp *suspend_opp; |
deaa5146 | 172 | |
7de36b0a VK |
173 | unsigned int *supported_hw; |
174 | unsigned int supported_hw_count; | |
01fb4d3c | 175 | const char *prop_name; |
d54974c2 | 176 | struct clk *clk; |
9f8ea969 | 177 | struct regulator *regulator; |
7de36b0a | 178 | |
deaa5146 VK |
179 | #ifdef CONFIG_DEBUG_FS |
180 | struct dentry *dentry; | |
181 | char dentry_name[NAME_MAX]; | |
182 | #endif | |
f59d3ee8 VK |
183 | }; |
184 | ||
185 | /* Routines internal to opp core */ | |
2c2709dc VK |
186 | struct opp_table *_find_opp_table(struct device *dev); |
187 | struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table); | |
f47b72a1 VK |
188 | void _dev_pm_opp_remove_table(struct device *dev, bool remove_all); |
189 | struct dev_pm_opp *_allocate_opp(struct device *dev, struct opp_table **opp_table); | |
190 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table); | |
191 | void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp, bool notify); | |
192 | int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, bool dynamic); | |
193 | void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of); | |
194 | ||
195 | #ifdef CONFIG_OF | |
196 | void _of_init_opp_table(struct opp_table *opp_table, struct device *dev); | |
197 | #else | |
198 | static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) {} | |
199 | #endif | |
f59d3ee8 | 200 | |
deaa5146 VK |
201 | #ifdef CONFIG_DEBUG_FS |
202 | void opp_debug_remove_one(struct dev_pm_opp *opp); | |
2c2709dc VK |
203 | int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table); |
204 | int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table); | |
205 | void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table); | |
deaa5146 VK |
206 | #else |
207 | static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {} | |
208 | ||
209 | static inline int opp_debug_create_one(struct dev_pm_opp *opp, | |
2c2709dc | 210 | struct opp_table *opp_table) |
deaa5146 | 211 | { return 0; } |
2c2709dc VK |
212 | static inline int opp_debug_register(struct opp_device *opp_dev, |
213 | struct opp_table *opp_table) | |
deaa5146 VK |
214 | { return 0; } |
215 | ||
2c2709dc VK |
216 | static inline void opp_debug_unregister(struct opp_device *opp_dev, |
217 | struct opp_table *opp_table) | |
deaa5146 VK |
218 | { } |
219 | #endif /* DEBUG_FS */ | |
220 | ||
f59d3ee8 | 221 | #endif /* __DRIVER_OPP_H__ */ |