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