Commit | Line | Data |
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a0dd7b79 | 1 | /* |
33692dc3 | 2 | * Generic OPP helper interface for CPU device |
a0dd7b79 NM |
3 | * |
4 | * Copyright (C) 2009-2014 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 | */ | |
d6d2a528 VK |
13 | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
f59d3ee8 | 16 | #include <linux/cpu.h> |
a0dd7b79 | 17 | #include <linux/cpufreq.h> |
a0dd7b79 NM |
18 | #include <linux/err.h> |
19 | #include <linux/errno.h> | |
20 | #include <linux/export.h> | |
f59d3ee8 | 21 | #include <linux/of.h> |
a0dd7b79 NM |
22 | #include <linux/slab.h> |
23 | ||
f59d3ee8 VK |
24 | #include "opp.h" |
25 | ||
33692dc3 | 26 | #ifdef CONFIG_CPU_FREQ |
f59d3ee8 | 27 | |
a0dd7b79 NM |
28 | /** |
29 | * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device | |
30 | * @dev: device for which we do this operation | |
31 | * @table: Cpufreq table returned back to caller | |
32 | * | |
33 | * Generate a cpufreq table for a provided device- this assumes that the | |
2c2709dc | 34 | * opp table is already initialized and ready for usage. |
a0dd7b79 NM |
35 | * |
36 | * This function allocates required memory for the cpufreq table. It is | |
37 | * expected that the caller does the required maintenance such as freeing | |
38 | * the table as required. | |
39 | * | |
40 | * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM | |
41 | * if no memory available for the operation (table is not populated), returns 0 | |
42 | * if successful and table is populated. | |
43 | * | |
44 | * WARNING: It is important for the callers to ensure refreshing their copy of | |
45 | * the table if any of the mentioned functions have been invoked in the interim. | |
46 | * | |
2c2709dc | 47 | * Locking: The internal opp_table and opp structures are RCU protected. |
a0dd7b79 NM |
48 | * Since we just use the regular accessor functions to access the internal data |
49 | * structures, we use RCU read lock inside this function. As a result, users of | |
50 | * this function DONOT need to use explicit locks for invoking. | |
51 | */ | |
52 | int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
53 | struct cpufreq_frequency_table **table) | |
54 | { | |
55 | struct dev_pm_opp *opp; | |
56 | struct cpufreq_frequency_table *freq_table = NULL; | |
57 | int i, max_opps, ret = 0; | |
58 | unsigned long rate; | |
59 | ||
60 | rcu_read_lock(); | |
61 | ||
62 | max_opps = dev_pm_opp_get_opp_count(dev); | |
63 | if (max_opps <= 0) { | |
64 | ret = max_opps ? max_opps : -ENODATA; | |
65 | goto out; | |
66 | } | |
67 | ||
d3599920 | 68 | freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_ATOMIC); |
a0dd7b79 NM |
69 | if (!freq_table) { |
70 | ret = -ENOMEM; | |
71 | goto out; | |
72 | } | |
73 | ||
74 | for (i = 0, rate = 0; i < max_opps; i++, rate++) { | |
75 | /* find next rate */ | |
76 | opp = dev_pm_opp_find_freq_ceil(dev, &rate); | |
77 | if (IS_ERR(opp)) { | |
78 | ret = PTR_ERR(opp); | |
79 | goto out; | |
80 | } | |
81 | freq_table[i].driver_data = i; | |
82 | freq_table[i].frequency = rate / 1000; | |
79eea44a BZ |
83 | |
84 | /* Is Boost/turbo opp ? */ | |
85 | if (dev_pm_opp_is_turbo(opp)) | |
86 | freq_table[i].flags = CPUFREQ_BOOST_FREQ; | |
a0dd7b79 NM |
87 | } |
88 | ||
89 | freq_table[i].driver_data = i; | |
90 | freq_table[i].frequency = CPUFREQ_TABLE_END; | |
91 | ||
92 | *table = &freq_table[0]; | |
93 | ||
94 | out: | |
95 | rcu_read_unlock(); | |
96 | if (ret) | |
97 | kfree(freq_table); | |
98 | ||
99 | return ret; | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table); | |
102 | ||
103 | /** | |
104 | * dev_pm_opp_free_cpufreq_table() - free the cpufreq table | |
105 | * @dev: device for which we do this operation | |
106 | * @table: table to free | |
107 | * | |
108 | * Free up the table allocated by dev_pm_opp_init_cpufreq_table | |
109 | */ | |
110 | void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
111 | struct cpufreq_frequency_table **table) | |
112 | { | |
113 | if (!table) | |
114 | return; | |
115 | ||
116 | kfree(*table); | |
117 | *table = NULL; | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table); | |
33692dc3 | 120 | #endif /* CONFIG_CPU_FREQ */ |
f59d3ee8 VK |
121 | |
122 | /* Required only for V1 bindings, as v2 can manage it from DT itself */ | |
123 | int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) | |
124 | { | |
2c2709dc VK |
125 | struct opp_device *opp_dev; |
126 | struct opp_table *opp_table; | |
f59d3ee8 VK |
127 | struct device *dev; |
128 | int cpu, ret = 0; | |
129 | ||
2c2709dc | 130 | mutex_lock(&opp_table_lock); |
f59d3ee8 | 131 | |
2c2709dc VK |
132 | opp_table = _find_opp_table(cpu_dev); |
133 | if (IS_ERR(opp_table)) { | |
f59d3ee8 | 134 | ret = -EINVAL; |
87b4115d | 135 | goto unlock; |
f59d3ee8 VK |
136 | } |
137 | ||
138 | for_each_cpu(cpu, cpumask) { | |
139 | if (cpu == cpu_dev->id) | |
140 | continue; | |
141 | ||
142 | dev = get_cpu_device(cpu); | |
143 | if (!dev) { | |
144 | dev_err(cpu_dev, "%s: failed to get cpu%d device\n", | |
145 | __func__, cpu); | |
146 | continue; | |
147 | } | |
148 | ||
2c2709dc VK |
149 | opp_dev = _add_opp_dev(dev, opp_table); |
150 | if (!opp_dev) { | |
151 | dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n", | |
f59d3ee8 VK |
152 | __func__, cpu); |
153 | continue; | |
154 | } | |
155 | } | |
87b4115d | 156 | unlock: |
2c2709dc | 157 | mutex_unlock(&opp_table_lock); |
f59d3ee8 | 158 | |
1794ec1f | 159 | return ret; |
f59d3ee8 VK |
160 | } |
161 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); | |
162 | ||
163 | #ifdef CONFIG_OF | |
164 | void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask) | |
165 | { | |
166 | struct device *cpu_dev; | |
167 | int cpu; | |
168 | ||
169 | WARN_ON(cpumask_empty(cpumask)); | |
170 | ||
171 | for_each_cpu(cpu, cpumask) { | |
172 | cpu_dev = get_cpu_device(cpu); | |
173 | if (!cpu_dev) { | |
174 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
175 | cpu); | |
176 | continue; | |
177 | } | |
178 | ||
179 | dev_pm_opp_of_remove_table(cpu_dev); | |
180 | } | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); | |
183 | ||
184 | int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask) | |
185 | { | |
186 | struct device *cpu_dev; | |
187 | int cpu, ret = 0; | |
188 | ||
189 | WARN_ON(cpumask_empty(cpumask)); | |
190 | ||
191 | for_each_cpu(cpu, cpumask) { | |
192 | cpu_dev = get_cpu_device(cpu); | |
193 | if (!cpu_dev) { | |
194 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
195 | cpu); | |
196 | continue; | |
197 | } | |
198 | ||
199 | ret = dev_pm_opp_of_add_table(cpu_dev); | |
200 | if (ret) { | |
201 | pr_err("%s: couldn't find opp table for cpu:%d, %d\n", | |
202 | __func__, cpu, ret); | |
203 | ||
204 | /* Free all other OPPs */ | |
205 | dev_pm_opp_of_cpumask_remove_table(cpumask); | |
206 | break; | |
207 | } | |
208 | } | |
209 | ||
210 | return ret; | |
211 | } | |
212 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); | |
213 | ||
214 | /* | |
215 | * Works only for OPP v2 bindings. | |
216 | * | |
f59d3ee8 VK |
217 | * Returns -ENOENT if operating-points-v2 bindings aren't supported. |
218 | */ | |
219 | int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) | |
220 | { | |
221 | struct device_node *np, *tmp_np; | |
222 | struct device *tcpu_dev; | |
223 | int cpu, ret = 0; | |
224 | ||
225 | /* Get OPP descriptor node */ | |
226 | np = _of_get_opp_desc_node(cpu_dev); | |
227 | if (!np) { | |
a6eed752 | 228 | dev_dbg(cpu_dev, "%s: Couldn't find cpu_dev node.\n", __func__); |
f59d3ee8 VK |
229 | return -ENOENT; |
230 | } | |
231 | ||
d9de19b1 PCC |
232 | cpumask_set_cpu(cpu_dev->id, cpumask); |
233 | ||
f59d3ee8 VK |
234 | /* OPPs are shared ? */ |
235 | if (!of_property_read_bool(np, "opp-shared")) | |
236 | goto put_cpu_node; | |
237 | ||
238 | for_each_possible_cpu(cpu) { | |
239 | if (cpu == cpu_dev->id) | |
240 | continue; | |
241 | ||
242 | tcpu_dev = get_cpu_device(cpu); | |
243 | if (!tcpu_dev) { | |
244 | dev_err(cpu_dev, "%s: failed to get cpu%d device\n", | |
245 | __func__, cpu); | |
246 | ret = -ENODEV; | |
247 | goto put_cpu_node; | |
248 | } | |
249 | ||
250 | /* Get OPP descriptor node */ | |
251 | tmp_np = _of_get_opp_desc_node(tcpu_dev); | |
252 | if (!tmp_np) { | |
a6eed752 DC |
253 | dev_err(tcpu_dev, "%s: Couldn't find tcpu_dev node.\n", |
254 | __func__); | |
255 | ret = -ENOENT; | |
f59d3ee8 VK |
256 | goto put_cpu_node; |
257 | } | |
258 | ||
259 | /* CPUs are sharing opp node */ | |
260 | if (np == tmp_np) | |
261 | cpumask_set_cpu(cpu, cpumask); | |
262 | ||
263 | of_node_put(tmp_np); | |
264 | } | |
265 | ||
266 | put_cpu_node: | |
267 | of_node_put(np); | |
268 | return ret; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); | |
271 | #endif |