Commit | Line | Data |
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95ceafd4 SG |
1 | /* |
2 | * Copyright (C) 2012 Freescale Semiconductor, Inc. | |
3 | * | |
748c8766 VK |
4 | * Copyright (C) 2014 Linaro. |
5 | * Viresh Kumar <viresh.kumar@linaro.org> | |
6 | * | |
95ceafd4 SG |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
13 | ||
14 | #include <linux/clk.h> | |
e1825b25 | 15 | #include <linux/cpu.h> |
77cff592 | 16 | #include <linux/cpu_cooling.h> |
95ceafd4 | 17 | #include <linux/cpufreq.h> |
77cff592 | 18 | #include <linux/cpumask.h> |
95ceafd4 SG |
19 | #include <linux/err.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/of.h> | |
e4db1c74 | 22 | #include <linux/pm_opp.h> |
5553f9e2 | 23 | #include <linux/platform_device.h> |
95ceafd4 SG |
24 | #include <linux/regulator/consumer.h> |
25 | #include <linux/slab.h> | |
77cff592 | 26 | #include <linux/thermal.h> |
95ceafd4 | 27 | |
297a6622 VK |
28 | #include "cpufreq-dt.h" |
29 | ||
d2f31f1d | 30 | struct private_data { |
91291d9a | 31 | struct opp_table *opp_table; |
d2f31f1d | 32 | struct device *cpu_dev; |
d2f31f1d | 33 | struct thermal_cooling_device *cdev; |
050794aa | 34 | const char *reg_name; |
51c99dd2 | 35 | bool have_static_opps; |
d2f31f1d | 36 | }; |
95ceafd4 | 37 | |
21c36d35 BZ |
38 | static struct freq_attr *cpufreq_dt_attr[] = { |
39 | &cpufreq_freq_attr_scaling_available_freqs, | |
40 | NULL, /* Extra space for boost-attr if required */ | |
41 | NULL, | |
42 | }; | |
43 | ||
bbcf0719 | 44 | static int set_target(struct cpufreq_policy *policy, unsigned int index) |
95ceafd4 | 45 | { |
d2f31f1d | 46 | struct private_data *priv = policy->driver_data; |
400ec74d DE |
47 | unsigned long freq = policy->freq_table[index].frequency; |
48 | int ret; | |
95ceafd4 | 49 | |
400ec74d DE |
50 | ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000); |
51 | ||
52 | if (!ret) { | |
53 | arch_set_freq_scale(policy->related_cpus, freq, | |
54 | policy->cpuinfo.max_freq); | |
55 | } | |
56 | ||
57 | return ret; | |
95ceafd4 SG |
58 | } |
59 | ||
050794aa VK |
60 | /* |
61 | * An earlier version of opp-v1 bindings used to name the regulator | |
62 | * "cpu0-supply", we still need to handle that for backwards compatibility. | |
63 | */ | |
df2c8ec2 | 64 | static const char *find_supply_name(struct device *dev) |
050794aa | 65 | { |
df2c8ec2 | 66 | struct device_node *np; |
050794aa VK |
67 | struct property *pp; |
68 | int cpu = dev->id; | |
df2c8ec2 VK |
69 | const char *name = NULL; |
70 | ||
71 | np = of_node_get(dev->of_node); | |
72 | ||
73 | /* This must be valid for sure */ | |
74 | if (WARN_ON(!np)) | |
75 | return NULL; | |
050794aa VK |
76 | |
77 | /* Try "cpu0" for older DTs */ | |
78 | if (!cpu) { | |
79 | pp = of_find_property(np, "cpu0-supply", NULL); | |
df2c8ec2 VK |
80 | if (pp) { |
81 | name = "cpu0"; | |
82 | goto node_put; | |
83 | } | |
050794aa VK |
84 | } |
85 | ||
86 | pp = of_find_property(np, "cpu-supply", NULL); | |
df2c8ec2 VK |
87 | if (pp) { |
88 | name = "cpu"; | |
89 | goto node_put; | |
90 | } | |
050794aa VK |
91 | |
92 | dev_dbg(dev, "no regulator for cpu%d\n", cpu); | |
df2c8ec2 VK |
93 | node_put: |
94 | of_node_put(np); | |
95 | return name; | |
050794aa VK |
96 | } |
97 | ||
dd02a3d9 | 98 | static int resources_available(void) |
95ceafd4 | 99 | { |
d2f31f1d VK |
100 | struct device *cpu_dev; |
101 | struct regulator *cpu_reg; | |
102 | struct clk *cpu_clk; | |
103 | int ret = 0; | |
dd02a3d9 | 104 | const char *name; |
95ceafd4 | 105 | |
dd02a3d9 | 106 | cpu_dev = get_cpu_device(0); |
e1825b25 | 107 | if (!cpu_dev) { |
dd02a3d9 | 108 | pr_err("failed to get cpu0 device\n"); |
e1825b25 SK |
109 | return -ENODEV; |
110 | } | |
6754f556 | 111 | |
dd02a3d9 VK |
112 | cpu_clk = clk_get(cpu_dev, NULL); |
113 | ret = PTR_ERR_OR_ZERO(cpu_clk); | |
b331bc20 | 114 | if (ret) { |
fc31d6f5 | 115 | /* |
dd02a3d9 VK |
116 | * If cpu's clk node is present, but clock is not yet |
117 | * registered, we should try defering probe. | |
fc31d6f5 | 118 | */ |
dd02a3d9 VK |
119 | if (ret == -EPROBE_DEFER) |
120 | dev_dbg(cpu_dev, "clock not ready, retry\n"); | |
121 | else | |
122 | dev_err(cpu_dev, "failed to get clock: %d\n", ret); | |
2d2c5e0e | 123 | |
dd02a3d9 | 124 | return ret; |
fc31d6f5 NM |
125 | } |
126 | ||
dd02a3d9 VK |
127 | clk_put(cpu_clk); |
128 | ||
129 | name = find_supply_name(cpu_dev); | |
130 | /* Platform doesn't require regulator */ | |
131 | if (!name) | |
132 | return 0; | |
d2f31f1d | 133 | |
dd02a3d9 VK |
134 | cpu_reg = regulator_get_optional(cpu_dev, name); |
135 | ret = PTR_ERR_OR_ZERO(cpu_reg); | |
136 | if (ret) { | |
48a8624b | 137 | /* |
dd02a3d9 VK |
138 | * If cpu's regulator supply node is present, but regulator is |
139 | * not yet registered, we should try defering probe. | |
48a8624b VK |
140 | */ |
141 | if (ret == -EPROBE_DEFER) | |
dd02a3d9 | 142 | dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n"); |
48a8624b | 143 | else |
dd02a3d9 VK |
144 | dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret); |
145 | ||
146 | return ret; | |
d2f31f1d VK |
147 | } |
148 | ||
dd02a3d9 VK |
149 | regulator_put(cpu_reg); |
150 | return 0; | |
d2f31f1d VK |
151 | } |
152 | ||
bbcf0719 | 153 | static int cpufreq_init(struct cpufreq_policy *policy) |
d2f31f1d VK |
154 | { |
155 | struct cpufreq_frequency_table *freq_table; | |
91291d9a | 156 | struct opp_table *opp_table = NULL; |
d2f31f1d VK |
157 | struct private_data *priv; |
158 | struct device *cpu_dev; | |
d2f31f1d VK |
159 | struct clk *cpu_clk; |
160 | unsigned int transition_latency; | |
1530b996 | 161 | bool fallback = false; |
050794aa | 162 | const char *name; |
d2f31f1d VK |
163 | int ret; |
164 | ||
dd02a3d9 VK |
165 | cpu_dev = get_cpu_device(policy->cpu); |
166 | if (!cpu_dev) { | |
167 | pr_err("failed to get cpu%d device\n", policy->cpu); | |
168 | return -ENODEV; | |
169 | } | |
170 | ||
171 | cpu_clk = clk_get(cpu_dev, NULL); | |
172 | if (IS_ERR(cpu_clk)) { | |
173 | ret = PTR_ERR(cpu_clk); | |
174 | dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret); | |
d2f31f1d VK |
175 | return ret; |
176 | } | |
48a8624b | 177 | |
2e02d872 | 178 | /* Get OPP-sharing information from "operating-points-v2" bindings */ |
8f8d37b2 | 179 | ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus); |
2e02d872 | 180 | if (ret) { |
1530b996 VK |
181 | if (ret != -ENOENT) |
182 | goto out_put_clk; | |
183 | ||
2e02d872 VK |
184 | /* |
185 | * operating-points-v2 not supported, fallback to old method of | |
1530b996 VK |
186 | * finding shared-OPPs for backward compatibility if the |
187 | * platform hasn't set sharing CPUs. | |
2e02d872 | 188 | */ |
1530b996 VK |
189 | if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus)) |
190 | fallback = true; | |
2e02d872 VK |
191 | } |
192 | ||
050794aa VK |
193 | /* |
194 | * OPP layer will be taking care of regulators now, but it needs to know | |
195 | * the name of the regulator first. | |
196 | */ | |
df2c8ec2 | 197 | name = find_supply_name(cpu_dev); |
050794aa | 198 | if (name) { |
dfbe4678 | 199 | opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1); |
91291d9a SB |
200 | if (IS_ERR(opp_table)) { |
201 | ret = PTR_ERR(opp_table); | |
050794aa VK |
202 | dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n", |
203 | policy->cpu, ret); | |
dd02a3d9 | 204 | goto out_put_clk; |
050794aa VK |
205 | } |
206 | } | |
207 | ||
51c99dd2 VK |
208 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
209 | if (!priv) { | |
210 | ret = -ENOMEM; | |
211 | goto out_put_regulator; | |
212 | } | |
213 | ||
214 | priv->reg_name = name; | |
215 | priv->opp_table = opp_table; | |
216 | ||
2e02d872 VK |
217 | /* |
218 | * Initialize OPP tables for all policy->cpus. They will be shared by | |
219 | * all CPUs which have marked their CPUs shared with OPP bindings. | |
220 | * | |
221 | * For platforms not using operating-points-v2 bindings, we do this | |
222 | * before updating policy->cpus. Otherwise, we will end up creating | |
223 | * duplicate OPPs for policy->cpus. | |
224 | * | |
225 | * OPPs might be populated at runtime, don't check for error here | |
226 | */ | |
51c99dd2 VK |
227 | if (!dev_pm_opp_of_cpumask_add_table(policy->cpus)) |
228 | priv->have_static_opps = true; | |
2e02d872 | 229 | |
7d5d0c8b VK |
230 | /* |
231 | * But we need OPP table to function so if it is not there let's | |
232 | * give platform code chance to provide it for us. | |
233 | */ | |
234 | ret = dev_pm_opp_get_opp_count(cpu_dev); | |
235 | if (ret <= 0) { | |
896d6a4c | 236 | dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n"); |
7d5d0c8b VK |
237 | ret = -EPROBE_DEFER; |
238 | goto out_free_opp; | |
239 | } | |
240 | ||
1530b996 | 241 | if (fallback) { |
eb96924a | 242 | cpumask_setall(policy->cpus); |
2e02d872 VK |
243 | |
244 | /* | |
245 | * OPP tables are initialized only for policy->cpu, do it for | |
246 | * others as well. | |
247 | */ | |
8f8d37b2 | 248 | ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus); |
8bc86284 VK |
249 | if (ret) |
250 | dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n", | |
251 | __func__, ret); | |
2e02d872 | 252 | } |
95ceafd4 | 253 | |
045ee45c LS |
254 | ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); |
255 | if (ret) { | |
896d6a4c | 256 | dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret); |
51c99dd2 | 257 | goto out_free_opp; |
045ee45c LS |
258 | } |
259 | ||
d2f31f1d | 260 | priv->cpu_dev = cpu_dev; |
d2f31f1d | 261 | policy->driver_data = priv; |
d2f31f1d | 262 | policy->clk = cpu_clk; |
29aa18a7 | 263 | policy->freq_table = freq_table; |
953ba9ff | 264 | |
3aa26a3b | 265 | policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000; |
953ba9ff | 266 | |
d15fa862 VK |
267 | /* Support turbo/boost mode */ |
268 | if (policy_has_boost_freq(policy)) { | |
269 | /* This gets disabled by core on driver unregister */ | |
270 | ret = cpufreq_enable_boost_support(); | |
271 | if (ret) | |
272 | goto out_free_cpufreq_table; | |
21c36d35 | 273 | cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs; |
34e5a527 TP |
274 | } |
275 | ||
755b888f VK |
276 | transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev); |
277 | if (!transition_latency) | |
278 | transition_latency = CPUFREQ_ETERNAL; | |
279 | ||
34e5a527 | 280 | policy->cpuinfo.transition_latency = transition_latency; |
99d14d0e | 281 | policy->dvfs_possible_from_any_cpu = true; |
34e5a527 | 282 | |
95ceafd4 SG |
283 | return 0; |
284 | ||
9a004428 | 285 | out_free_cpufreq_table: |
5d4879cd | 286 | dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); |
2f0f609f | 287 | out_free_opp: |
51c99dd2 VK |
288 | if (priv->have_static_opps) |
289 | dev_pm_opp_of_cpumask_remove_table(policy->cpus); | |
290 | kfree(priv); | |
291 | out_put_regulator: | |
050794aa | 292 | if (name) |
dfbe4678 | 293 | dev_pm_opp_put_regulators(opp_table); |
dd02a3d9 | 294 | out_put_clk: |
ed4b053c | 295 | clk_put(cpu_clk); |
d2f31f1d VK |
296 | |
297 | return ret; | |
298 | } | |
299 | ||
bbcf0719 | 300 | static int cpufreq_exit(struct cpufreq_policy *policy) |
d2f31f1d VK |
301 | { |
302 | struct private_data *priv = policy->driver_data; | |
303 | ||
17ad13ba | 304 | cpufreq_cooling_unregister(priv->cdev); |
d2f31f1d | 305 | dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table); |
51c99dd2 VK |
306 | if (priv->have_static_opps) |
307 | dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); | |
050794aa | 308 | if (priv->reg_name) |
dfbe4678 | 309 | dev_pm_opp_put_regulators(priv->opp_table); |
050794aa | 310 | |
d2f31f1d | 311 | clk_put(policy->clk); |
d2f31f1d VK |
312 | kfree(priv); |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
9a004428 VK |
317 | static void cpufreq_ready(struct cpufreq_policy *policy) |
318 | { | |
319 | struct private_data *priv = policy->driver_data; | |
9a004428 | 320 | |
3ebb62ff | 321 | priv->cdev = of_cpufreq_cooling_register(policy); |
9a004428 VK |
322 | } |
323 | ||
bbcf0719 | 324 | static struct cpufreq_driver dt_cpufreq_driver = { |
d2f31f1d VK |
325 | .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK, |
326 | .verify = cpufreq_generic_frequency_table_verify, | |
bbcf0719 | 327 | .target_index = set_target, |
d2f31f1d | 328 | .get = cpufreq_generic_get, |
bbcf0719 VK |
329 | .init = cpufreq_init, |
330 | .exit = cpufreq_exit, | |
9a004428 | 331 | .ready = cpufreq_ready, |
bbcf0719 | 332 | .name = "cpufreq-dt", |
21c36d35 | 333 | .attr = cpufreq_dt_attr, |
953ba9ff | 334 | .suspend = cpufreq_generic_suspend, |
d2f31f1d VK |
335 | }; |
336 | ||
bbcf0719 | 337 | static int dt_cpufreq_probe(struct platform_device *pdev) |
d2f31f1d | 338 | { |
297a6622 | 339 | struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev); |
d2f31f1d VK |
340 | int ret; |
341 | ||
342 | /* | |
343 | * All per-cluster (CPUs sharing clock/voltages) initialization is done | |
344 | * from ->init(). In probe(), we just need to make sure that clk and | |
345 | * regulators are available. Else defer probe and retry. | |
346 | * | |
347 | * FIXME: Is checking this only for CPU0 sufficient ? | |
348 | */ | |
dd02a3d9 | 349 | ret = resources_available(); |
d2f31f1d VK |
350 | if (ret) |
351 | return ret; | |
352 | ||
67782701 VK |
353 | if (data) { |
354 | if (data->have_governor_per_policy) | |
355 | dt_cpufreq_driver.flags |= CPUFREQ_HAVE_GOVERNOR_PER_POLICY; | |
356 | ||
357 | dt_cpufreq_driver.resume = data->resume; | |
358 | if (data->suspend) | |
359 | dt_cpufreq_driver.suspend = data->suspend; | |
360 | } | |
297a6622 | 361 | |
bbcf0719 | 362 | ret = cpufreq_register_driver(&dt_cpufreq_driver); |
d2f31f1d | 363 | if (ret) |
dd02a3d9 | 364 | dev_err(&pdev->dev, "failed register driver: %d\n", ret); |
d2f31f1d | 365 | |
95ceafd4 SG |
366 | return ret; |
367 | } | |
5553f9e2 | 368 | |
bbcf0719 | 369 | static int dt_cpufreq_remove(struct platform_device *pdev) |
5553f9e2 | 370 | { |
bbcf0719 | 371 | cpufreq_unregister_driver(&dt_cpufreq_driver); |
5553f9e2 SG |
372 | return 0; |
373 | } | |
374 | ||
bbcf0719 | 375 | static struct platform_driver dt_cpufreq_platdrv = { |
5553f9e2 | 376 | .driver = { |
bbcf0719 | 377 | .name = "cpufreq-dt", |
5553f9e2 | 378 | }, |
bbcf0719 VK |
379 | .probe = dt_cpufreq_probe, |
380 | .remove = dt_cpufreq_remove, | |
5553f9e2 | 381 | }; |
bbcf0719 | 382 | module_platform_driver(dt_cpufreq_platdrv); |
95ceafd4 | 383 | |
07949bf9 | 384 | MODULE_ALIAS("platform:cpufreq-dt"); |
748c8766 | 385 | MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>"); |
95ceafd4 | 386 | MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>"); |
bbcf0719 | 387 | MODULE_DESCRIPTION("Generic cpufreq driver"); |
95ceafd4 | 388 | MODULE_LICENSE("GPL"); |