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 | |
d2f31f1d VK |
28 | struct private_data { |
29 | struct device *cpu_dev; | |
d2f31f1d | 30 | struct thermal_cooling_device *cdev; |
050794aa | 31 | const char *reg_name; |
d2f31f1d | 32 | }; |
95ceafd4 | 33 | |
21c36d35 BZ |
34 | static struct freq_attr *cpufreq_dt_attr[] = { |
35 | &cpufreq_freq_attr_scaling_available_freqs, | |
36 | NULL, /* Extra space for boost-attr if required */ | |
37 | NULL, | |
38 | }; | |
39 | ||
bbcf0719 | 40 | static int set_target(struct cpufreq_policy *policy, unsigned int index) |
95ceafd4 | 41 | { |
d2f31f1d | 42 | struct private_data *priv = policy->driver_data; |
95ceafd4 | 43 | |
78c3ba5d VK |
44 | return dev_pm_opp_set_rate(priv->cpu_dev, |
45 | policy->freq_table[index].frequency * 1000); | |
95ceafd4 SG |
46 | } |
47 | ||
050794aa VK |
48 | /* |
49 | * An earlier version of opp-v1 bindings used to name the regulator | |
50 | * "cpu0-supply", we still need to handle that for backwards compatibility. | |
51 | */ | |
df2c8ec2 | 52 | static const char *find_supply_name(struct device *dev) |
050794aa | 53 | { |
df2c8ec2 | 54 | struct device_node *np; |
050794aa VK |
55 | struct property *pp; |
56 | int cpu = dev->id; | |
df2c8ec2 VK |
57 | const char *name = NULL; |
58 | ||
59 | np = of_node_get(dev->of_node); | |
60 | ||
61 | /* This must be valid for sure */ | |
62 | if (WARN_ON(!np)) | |
63 | return NULL; | |
050794aa VK |
64 | |
65 | /* Try "cpu0" for older DTs */ | |
66 | if (!cpu) { | |
67 | pp = of_find_property(np, "cpu0-supply", NULL); | |
df2c8ec2 VK |
68 | if (pp) { |
69 | name = "cpu0"; | |
70 | goto node_put; | |
71 | } | |
050794aa VK |
72 | } |
73 | ||
74 | pp = of_find_property(np, "cpu-supply", NULL); | |
df2c8ec2 VK |
75 | if (pp) { |
76 | name = "cpu"; | |
77 | goto node_put; | |
78 | } | |
050794aa VK |
79 | |
80 | dev_dbg(dev, "no regulator for cpu%d\n", cpu); | |
df2c8ec2 VK |
81 | node_put: |
82 | of_node_put(np); | |
83 | return name; | |
050794aa VK |
84 | } |
85 | ||
dd02a3d9 | 86 | static int resources_available(void) |
95ceafd4 | 87 | { |
d2f31f1d VK |
88 | struct device *cpu_dev; |
89 | struct regulator *cpu_reg; | |
90 | struct clk *cpu_clk; | |
91 | int ret = 0; | |
dd02a3d9 | 92 | const char *name; |
95ceafd4 | 93 | |
dd02a3d9 | 94 | cpu_dev = get_cpu_device(0); |
e1825b25 | 95 | if (!cpu_dev) { |
dd02a3d9 | 96 | pr_err("failed to get cpu0 device\n"); |
e1825b25 SK |
97 | return -ENODEV; |
98 | } | |
6754f556 | 99 | |
dd02a3d9 VK |
100 | cpu_clk = clk_get(cpu_dev, NULL); |
101 | ret = PTR_ERR_OR_ZERO(cpu_clk); | |
b331bc20 | 102 | if (ret) { |
fc31d6f5 | 103 | /* |
dd02a3d9 VK |
104 | * If cpu's clk node is present, but clock is not yet |
105 | * registered, we should try defering probe. | |
fc31d6f5 | 106 | */ |
dd02a3d9 VK |
107 | if (ret == -EPROBE_DEFER) |
108 | dev_dbg(cpu_dev, "clock not ready, retry\n"); | |
109 | else | |
110 | dev_err(cpu_dev, "failed to get clock: %d\n", ret); | |
2d2c5e0e | 111 | |
dd02a3d9 | 112 | return ret; |
fc31d6f5 NM |
113 | } |
114 | ||
dd02a3d9 VK |
115 | clk_put(cpu_clk); |
116 | ||
117 | name = find_supply_name(cpu_dev); | |
118 | /* Platform doesn't require regulator */ | |
119 | if (!name) | |
120 | return 0; | |
d2f31f1d | 121 | |
dd02a3d9 VK |
122 | cpu_reg = regulator_get_optional(cpu_dev, name); |
123 | ret = PTR_ERR_OR_ZERO(cpu_reg); | |
124 | if (ret) { | |
48a8624b | 125 | /* |
dd02a3d9 VK |
126 | * If cpu's regulator supply node is present, but regulator is |
127 | * not yet registered, we should try defering probe. | |
48a8624b VK |
128 | */ |
129 | if (ret == -EPROBE_DEFER) | |
dd02a3d9 | 130 | dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n"); |
48a8624b | 131 | else |
dd02a3d9 VK |
132 | dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret); |
133 | ||
134 | return ret; | |
d2f31f1d VK |
135 | } |
136 | ||
dd02a3d9 VK |
137 | regulator_put(cpu_reg); |
138 | return 0; | |
d2f31f1d VK |
139 | } |
140 | ||
bbcf0719 | 141 | static int cpufreq_init(struct cpufreq_policy *policy) |
d2f31f1d VK |
142 | { |
143 | struct cpufreq_frequency_table *freq_table; | |
d2f31f1d VK |
144 | struct private_data *priv; |
145 | struct device *cpu_dev; | |
d2f31f1d | 146 | struct clk *cpu_clk; |
953ba9ff | 147 | struct dev_pm_opp *suspend_opp; |
d2f31f1d | 148 | unsigned int transition_latency; |
1530b996 | 149 | bool fallback = false; |
050794aa | 150 | const char *name; |
d2f31f1d VK |
151 | int ret; |
152 | ||
dd02a3d9 VK |
153 | cpu_dev = get_cpu_device(policy->cpu); |
154 | if (!cpu_dev) { | |
155 | pr_err("failed to get cpu%d device\n", policy->cpu); | |
156 | return -ENODEV; | |
157 | } | |
158 | ||
159 | cpu_clk = clk_get(cpu_dev, NULL); | |
160 | if (IS_ERR(cpu_clk)) { | |
161 | ret = PTR_ERR(cpu_clk); | |
162 | dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret); | |
d2f31f1d VK |
163 | return ret; |
164 | } | |
48a8624b | 165 | |
2e02d872 | 166 | /* Get OPP-sharing information from "operating-points-v2" bindings */ |
8f8d37b2 | 167 | ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus); |
2e02d872 | 168 | if (ret) { |
1530b996 VK |
169 | if (ret != -ENOENT) |
170 | goto out_put_clk; | |
171 | ||
2e02d872 VK |
172 | /* |
173 | * operating-points-v2 not supported, fallback to old method of | |
1530b996 VK |
174 | * finding shared-OPPs for backward compatibility if the |
175 | * platform hasn't set sharing CPUs. | |
2e02d872 | 176 | */ |
1530b996 VK |
177 | if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus)) |
178 | fallback = true; | |
2e02d872 VK |
179 | } |
180 | ||
050794aa VK |
181 | /* |
182 | * OPP layer will be taking care of regulators now, but it needs to know | |
183 | * the name of the regulator first. | |
184 | */ | |
df2c8ec2 | 185 | name = find_supply_name(cpu_dev); |
050794aa VK |
186 | if (name) { |
187 | ret = dev_pm_opp_set_regulator(cpu_dev, name); | |
188 | if (ret) { | |
189 | dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n", | |
190 | policy->cpu, ret); | |
dd02a3d9 | 191 | goto out_put_clk; |
050794aa VK |
192 | } |
193 | } | |
194 | ||
2e02d872 VK |
195 | /* |
196 | * Initialize OPP tables for all policy->cpus. They will be shared by | |
197 | * all CPUs which have marked their CPUs shared with OPP bindings. | |
198 | * | |
199 | * For platforms not using operating-points-v2 bindings, we do this | |
200 | * before updating policy->cpus. Otherwise, we will end up creating | |
201 | * duplicate OPPs for policy->cpus. | |
202 | * | |
203 | * OPPs might be populated at runtime, don't check for error here | |
204 | */ | |
8f8d37b2 | 205 | dev_pm_opp_of_cpumask_add_table(policy->cpus); |
2e02d872 | 206 | |
7d5d0c8b VK |
207 | /* |
208 | * But we need OPP table to function so if it is not there let's | |
209 | * give platform code chance to provide it for us. | |
210 | */ | |
211 | ret = dev_pm_opp_get_opp_count(cpu_dev); | |
212 | if (ret <= 0) { | |
896d6a4c | 213 | dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n"); |
7d5d0c8b VK |
214 | ret = -EPROBE_DEFER; |
215 | goto out_free_opp; | |
216 | } | |
217 | ||
1530b996 | 218 | if (fallback) { |
eb96924a | 219 | cpumask_setall(policy->cpus); |
2e02d872 VK |
220 | |
221 | /* | |
222 | * OPP tables are initialized only for policy->cpu, do it for | |
223 | * others as well. | |
224 | */ | |
8f8d37b2 | 225 | ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus); |
8bc86284 VK |
226 | if (ret) |
227 | dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n", | |
228 | __func__, ret); | |
2e02d872 | 229 | } |
95ceafd4 | 230 | |
d2f31f1d VK |
231 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
232 | if (!priv) { | |
233 | ret = -ENOMEM; | |
2f0f609f | 234 | goto out_free_opp; |
95ceafd4 SG |
235 | } |
236 | ||
050794aa | 237 | priv->reg_name = name; |
95ceafd4 | 238 | |
045ee45c LS |
239 | ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); |
240 | if (ret) { | |
896d6a4c | 241 | dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret); |
045ee45c LS |
242 | goto out_free_priv; |
243 | } | |
244 | ||
d2f31f1d | 245 | priv->cpu_dev = cpu_dev; |
d2f31f1d | 246 | policy->driver_data = priv; |
d2f31f1d | 247 | policy->clk = cpu_clk; |
953ba9ff BZ |
248 | |
249 | rcu_read_lock(); | |
250 | suspend_opp = dev_pm_opp_get_suspend_opp(cpu_dev); | |
251 | if (suspend_opp) | |
252 | policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000; | |
253 | rcu_read_unlock(); | |
254 | ||
34e5a527 TP |
255 | ret = cpufreq_table_validate_and_show(policy, freq_table); |
256 | if (ret) { | |
257 | dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__, | |
258 | ret); | |
9a004428 | 259 | goto out_free_cpufreq_table; |
d15fa862 VK |
260 | } |
261 | ||
262 | /* Support turbo/boost mode */ | |
263 | if (policy_has_boost_freq(policy)) { | |
264 | /* This gets disabled by core on driver unregister */ | |
265 | ret = cpufreq_enable_boost_support(); | |
266 | if (ret) | |
267 | goto out_free_cpufreq_table; | |
21c36d35 | 268 | cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs; |
34e5a527 TP |
269 | } |
270 | ||
755b888f VK |
271 | transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev); |
272 | if (!transition_latency) | |
273 | transition_latency = CPUFREQ_ETERNAL; | |
274 | ||
34e5a527 TP |
275 | policy->cpuinfo.transition_latency = transition_latency; |
276 | ||
95ceafd4 SG |
277 | return 0; |
278 | ||
9a004428 | 279 | out_free_cpufreq_table: |
5d4879cd | 280 | dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); |
045ee45c LS |
281 | out_free_priv: |
282 | kfree(priv); | |
2f0f609f | 283 | out_free_opp: |
8f8d37b2 | 284 | dev_pm_opp_of_cpumask_remove_table(policy->cpus); |
050794aa VK |
285 | if (name) |
286 | dev_pm_opp_put_regulator(cpu_dev); | |
dd02a3d9 | 287 | out_put_clk: |
ed4b053c | 288 | clk_put(cpu_clk); |
d2f31f1d VK |
289 | |
290 | return ret; | |
291 | } | |
292 | ||
bbcf0719 | 293 | static int cpufreq_exit(struct cpufreq_policy *policy) |
d2f31f1d VK |
294 | { |
295 | struct private_data *priv = policy->driver_data; | |
296 | ||
17ad13ba | 297 | cpufreq_cooling_unregister(priv->cdev); |
d2f31f1d | 298 | dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table); |
8f8d37b2 | 299 | dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); |
050794aa VK |
300 | if (priv->reg_name) |
301 | dev_pm_opp_put_regulator(priv->cpu_dev); | |
302 | ||
d2f31f1d | 303 | clk_put(policy->clk); |
d2f31f1d VK |
304 | kfree(priv); |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
9a004428 VK |
309 | static void cpufreq_ready(struct cpufreq_policy *policy) |
310 | { | |
311 | struct private_data *priv = policy->driver_data; | |
312 | struct device_node *np = of_node_get(priv->cpu_dev->of_node); | |
313 | ||
314 | if (WARN_ON(!np)) | |
315 | return; | |
316 | ||
317 | /* | |
318 | * For now, just loading the cooling device; | |
319 | * thermal DT code takes care of matching them. | |
320 | */ | |
321 | if (of_find_property(np, "#cooling-cells", NULL)) { | |
f8fa8ae0 PA |
322 | u32 power_coefficient = 0; |
323 | ||
324 | of_property_read_u32(np, "dynamic-power-coefficient", | |
325 | &power_coefficient); | |
326 | ||
327 | priv->cdev = of_cpufreq_power_cooling_register(np, | |
328 | policy->related_cpus, power_coefficient, NULL); | |
9a004428 VK |
329 | if (IS_ERR(priv->cdev)) { |
330 | dev_err(priv->cpu_dev, | |
331 | "running cpufreq without cooling device: %ld\n", | |
332 | PTR_ERR(priv->cdev)); | |
333 | ||
334 | priv->cdev = NULL; | |
335 | } | |
336 | } | |
337 | ||
338 | of_node_put(np); | |
339 | } | |
340 | ||
bbcf0719 | 341 | static struct cpufreq_driver dt_cpufreq_driver = { |
d2f31f1d VK |
342 | .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK, |
343 | .verify = cpufreq_generic_frequency_table_verify, | |
bbcf0719 | 344 | .target_index = set_target, |
d2f31f1d | 345 | .get = cpufreq_generic_get, |
bbcf0719 VK |
346 | .init = cpufreq_init, |
347 | .exit = cpufreq_exit, | |
9a004428 | 348 | .ready = cpufreq_ready, |
bbcf0719 | 349 | .name = "cpufreq-dt", |
21c36d35 | 350 | .attr = cpufreq_dt_attr, |
953ba9ff | 351 | .suspend = cpufreq_generic_suspend, |
d2f31f1d VK |
352 | }; |
353 | ||
bbcf0719 | 354 | static int dt_cpufreq_probe(struct platform_device *pdev) |
d2f31f1d | 355 | { |
d2f31f1d VK |
356 | int ret; |
357 | ||
358 | /* | |
359 | * All per-cluster (CPUs sharing clock/voltages) initialization is done | |
360 | * from ->init(). In probe(), we just need to make sure that clk and | |
361 | * regulators are available. Else defer probe and retry. | |
362 | * | |
363 | * FIXME: Is checking this only for CPU0 sufficient ? | |
364 | */ | |
dd02a3d9 | 365 | ret = resources_available(); |
d2f31f1d VK |
366 | if (ret) |
367 | return ret; | |
368 | ||
34e5a527 TP |
369 | dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev); |
370 | ||
bbcf0719 | 371 | ret = cpufreq_register_driver(&dt_cpufreq_driver); |
d2f31f1d | 372 | if (ret) |
dd02a3d9 | 373 | dev_err(&pdev->dev, "failed register driver: %d\n", ret); |
d2f31f1d | 374 | |
95ceafd4 SG |
375 | return ret; |
376 | } | |
5553f9e2 | 377 | |
bbcf0719 | 378 | static int dt_cpufreq_remove(struct platform_device *pdev) |
5553f9e2 | 379 | { |
bbcf0719 | 380 | cpufreq_unregister_driver(&dt_cpufreq_driver); |
5553f9e2 SG |
381 | return 0; |
382 | } | |
383 | ||
bbcf0719 | 384 | static struct platform_driver dt_cpufreq_platdrv = { |
5553f9e2 | 385 | .driver = { |
bbcf0719 | 386 | .name = "cpufreq-dt", |
5553f9e2 | 387 | }, |
bbcf0719 VK |
388 | .probe = dt_cpufreq_probe, |
389 | .remove = dt_cpufreq_remove, | |
5553f9e2 | 390 | }; |
bbcf0719 | 391 | module_platform_driver(dt_cpufreq_platdrv); |
95ceafd4 | 392 | |
07949bf9 | 393 | MODULE_ALIAS("platform:cpufreq-dt"); |
748c8766 | 394 | MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>"); |
95ceafd4 | 395 | MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>"); |
bbcf0719 | 396 | MODULE_DESCRIPTION("Generic cpufreq driver"); |
95ceafd4 | 397 | MODULE_LICENSE("GPL"); |