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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
95ceafd4 SG |
2 | /* |
3 | * Copyright (C) 2012 Freescale Semiconductor, Inc. | |
4 | * | |
748c8766 VK |
5 | * Copyright (C) 2014 Linaro. |
6 | * Viresh Kumar <viresh.kumar@linaro.org> | |
95ceafd4 SG |
7 | */ |
8 | ||
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/clk.h> | |
e1825b25 | 12 | #include <linux/cpu.h> |
95ceafd4 | 13 | #include <linux/cpufreq.h> |
77cff592 | 14 | #include <linux/cpumask.h> |
95ceafd4 | 15 | #include <linux/err.h> |
dc279ac6 | 16 | #include <linux/list.h> |
95ceafd4 SG |
17 | #include <linux/module.h> |
18 | #include <linux/of.h> | |
e4db1c74 | 19 | #include <linux/pm_opp.h> |
5553f9e2 | 20 | #include <linux/platform_device.h> |
95ceafd4 SG |
21 | #include <linux/regulator/consumer.h> |
22 | #include <linux/slab.h> | |
77cff592 | 23 | #include <linux/thermal.h> |
95ceafd4 | 24 | |
297a6622 VK |
25 | #include "cpufreq-dt.h" |
26 | ||
d2f31f1d | 27 | struct private_data { |
dc279ac6 SG |
28 | struct list_head node; |
29 | ||
30 | cpumask_var_t cpus; | |
d2f31f1d | 31 | struct device *cpu_dev; |
dc279ac6 | 32 | struct opp_table *opp_table; |
873c9851 | 33 | struct cpufreq_frequency_table *freq_table; |
51c99dd2 | 34 | bool have_static_opps; |
d2f31f1d | 35 | }; |
95ceafd4 | 36 | |
dc279ac6 SG |
37 | static LIST_HEAD(priv_list); |
38 | ||
21c36d35 BZ |
39 | static struct freq_attr *cpufreq_dt_attr[] = { |
40 | &cpufreq_freq_attr_scaling_available_freqs, | |
41 | NULL, /* Extra space for boost-attr if required */ | |
42 | NULL, | |
43 | }; | |
44 | ||
dc279ac6 SG |
45 | static struct private_data *cpufreq_dt_find_data(int cpu) |
46 | { | |
47 | struct private_data *priv; | |
48 | ||
49 | list_for_each_entry(priv, &priv_list, node) { | |
50 | if (cpumask_test_cpu(cpu, priv->cpus)) | |
51 | return priv; | |
52 | } | |
53 | ||
54 | return NULL; | |
55 | } | |
56 | ||
bbcf0719 | 57 | static int set_target(struct cpufreq_policy *policy, unsigned int index) |
95ceafd4 | 58 | { |
d2f31f1d | 59 | struct private_data *priv = policy->driver_data; |
400ec74d | 60 | unsigned long freq = policy->freq_table[index].frequency; |
95ceafd4 | 61 | |
1a0419b0 | 62 | return dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000); |
95ceafd4 SG |
63 | } |
64 | ||
050794aa VK |
65 | /* |
66 | * An earlier version of opp-v1 bindings used to name the regulator | |
67 | * "cpu0-supply", we still need to handle that for backwards compatibility. | |
68 | */ | |
df2c8ec2 | 69 | static const char *find_supply_name(struct device *dev) |
050794aa | 70 | { |
df2c8ec2 | 71 | struct device_node *np; |
050794aa VK |
72 | struct property *pp; |
73 | int cpu = dev->id; | |
df2c8ec2 VK |
74 | const char *name = NULL; |
75 | ||
76 | np = of_node_get(dev->of_node); | |
77 | ||
78 | /* This must be valid for sure */ | |
79 | if (WARN_ON(!np)) | |
80 | return NULL; | |
050794aa VK |
81 | |
82 | /* Try "cpu0" for older DTs */ | |
83 | if (!cpu) { | |
84 | pp = of_find_property(np, "cpu0-supply", NULL); | |
df2c8ec2 VK |
85 | if (pp) { |
86 | name = "cpu0"; | |
87 | goto node_put; | |
88 | } | |
050794aa VK |
89 | } |
90 | ||
91 | pp = of_find_property(np, "cpu-supply", NULL); | |
df2c8ec2 VK |
92 | if (pp) { |
93 | name = "cpu"; | |
94 | goto node_put; | |
95 | } | |
050794aa VK |
96 | |
97 | dev_dbg(dev, "no regulator for cpu%d\n", cpu); | |
df2c8ec2 VK |
98 | node_put: |
99 | of_node_put(np); | |
100 | return name; | |
050794aa VK |
101 | } |
102 | ||
bbcf0719 | 103 | static int cpufreq_init(struct cpufreq_policy *policy) |
d2f31f1d | 104 | { |
d2f31f1d VK |
105 | struct private_data *priv; |
106 | struct device *cpu_dev; | |
d2f31f1d VK |
107 | struct clk *cpu_clk; |
108 | unsigned int transition_latency; | |
109 | int ret; | |
110 | ||
dc279ac6 SG |
111 | priv = cpufreq_dt_find_data(policy->cpu); |
112 | if (!priv) { | |
113 | pr_err("failed to find data for cpu%d\n", policy->cpu); | |
dd02a3d9 VK |
114 | return -ENODEV; |
115 | } | |
dc279ac6 | 116 | cpu_dev = priv->cpu_dev; |
dc279ac6 | 117 | |
dd02a3d9 VK |
118 | cpu_clk = clk_get(cpu_dev, NULL); |
119 | if (IS_ERR(cpu_clk)) { | |
120 | ret = PTR_ERR(cpu_clk); | |
121 | dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret); | |
d2f31f1d VK |
122 | return ret; |
123 | } | |
48a8624b | 124 | |
873c9851 VK |
125 | transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev); |
126 | if (!transition_latency) | |
127 | transition_latency = CPUFREQ_ETERNAL; | |
045ee45c | 128 | |
873c9851 | 129 | cpumask_copy(policy->cpus, priv->cpus); |
d2f31f1d | 130 | policy->driver_data = priv; |
d2f31f1d | 131 | policy->clk = cpu_clk; |
873c9851 | 132 | policy->freq_table = priv->freq_table; |
3aa26a3b | 133 | policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000; |
873c9851 VK |
134 | policy->cpuinfo.transition_latency = transition_latency; |
135 | policy->dvfs_possible_from_any_cpu = true; | |
953ba9ff | 136 | |
d15fa862 VK |
137 | /* Support turbo/boost mode */ |
138 | if (policy_has_boost_freq(policy)) { | |
139 | /* This gets disabled by core on driver unregister */ | |
140 | ret = cpufreq_enable_boost_support(); | |
141 | if (ret) | |
873c9851 | 142 | goto out_clk_put; |
21c36d35 | 143 | cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs; |
34e5a527 TP |
144 | } |
145 | ||
0e0ffa85 | 146 | dev_pm_opp_of_register_em(cpu_dev, policy->cpus); |
76d004bf | 147 | |
95ceafd4 SG |
148 | return 0; |
149 | ||
873c9851 | 150 | out_clk_put: |
ed4b053c | 151 | clk_put(cpu_clk); |
d2f31f1d VK |
152 | |
153 | return ret; | |
154 | } | |
155 | ||
263abfe7 VK |
156 | static int cpufreq_online(struct cpufreq_policy *policy) |
157 | { | |
158 | /* We did light-weight tear down earlier, nothing to do here */ | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static int cpufreq_offline(struct cpufreq_policy *policy) | |
163 | { | |
164 | /* | |
165 | * Preserve policy->driver_data and don't free resources on light-weight | |
166 | * tear down. | |
167 | */ | |
168 | return 0; | |
169 | } | |
170 | ||
bbcf0719 | 171 | static int cpufreq_exit(struct cpufreq_policy *policy) |
d2f31f1d | 172 | { |
d2f31f1d | 173 | clk_put(policy->clk); |
d2f31f1d VK |
174 | return 0; |
175 | } | |
176 | ||
bbcf0719 | 177 | static struct cpufreq_driver dt_cpufreq_driver = { |
5ae4a4b4 | 178 | .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK | |
e248d8d3 | 179 | CPUFREQ_IS_COOLING_DEV, |
d2f31f1d | 180 | .verify = cpufreq_generic_frequency_table_verify, |
bbcf0719 | 181 | .target_index = set_target, |
d2f31f1d | 182 | .get = cpufreq_generic_get, |
bbcf0719 VK |
183 | .init = cpufreq_init, |
184 | .exit = cpufreq_exit, | |
263abfe7 VK |
185 | .online = cpufreq_online, |
186 | .offline = cpufreq_offline, | |
bbcf0719 | 187 | .name = "cpufreq-dt", |
21c36d35 | 188 | .attr = cpufreq_dt_attr, |
953ba9ff | 189 | .suspend = cpufreq_generic_suspend, |
d2f31f1d VK |
190 | }; |
191 | ||
dc279ac6 | 192 | static int dt_cpufreq_early_init(struct device *dev, int cpu) |
d2f31f1d | 193 | { |
dc279ac6 SG |
194 | struct private_data *priv; |
195 | struct device *cpu_dev; | |
873c9851 | 196 | bool fallback = false; |
dc279ac6 | 197 | const char *reg_name; |
d2f31f1d VK |
198 | int ret; |
199 | ||
dc279ac6 SG |
200 | /* Check if this CPU is already covered by some other policy */ |
201 | if (cpufreq_dt_find_data(cpu)) | |
202 | return 0; | |
203 | ||
204 | cpu_dev = get_cpu_device(cpu); | |
205 | if (!cpu_dev) | |
206 | return -EPROBE_DEFER; | |
207 | ||
208 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
209 | if (!priv) | |
210 | return -ENOMEM; | |
211 | ||
212 | if (!alloc_cpumask_var(&priv->cpus, GFP_KERNEL)) | |
213 | return -ENOMEM; | |
214 | ||
873c9851 | 215 | cpumask_set_cpu(cpu, priv->cpus); |
dc279ac6 SG |
216 | priv->cpu_dev = cpu_dev; |
217 | ||
d2f31f1d | 218 | /* |
dc279ac6 SG |
219 | * OPP layer will be taking care of regulators now, but it needs to know |
220 | * the name of the regulator first. | |
d2f31f1d | 221 | */ |
dc279ac6 SG |
222 | reg_name = find_supply_name(cpu_dev); |
223 | if (reg_name) { | |
873c9851 VK |
224 | priv->opp_table = dev_pm_opp_set_regulators(cpu_dev, ®_name, |
225 | 1); | |
226 | if (IS_ERR(priv->opp_table)) { | |
227 | ret = PTR_ERR(priv->opp_table); | |
dc279ac6 SG |
228 | if (ret != -EPROBE_DEFER) |
229 | dev_err(cpu_dev, "failed to set regulators: %d\n", | |
230 | ret); | |
873c9851 | 231 | goto free_cpumask; |
dc279ac6 SG |
232 | } |
233 | } | |
234 | ||
dc279ac6 SG |
235 | /* Get OPP-sharing information from "operating-points-v2" bindings */ |
236 | ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->cpus); | |
237 | if (ret) { | |
238 | if (ret != -ENOENT) | |
873c9851 | 239 | goto out; |
dc279ac6 SG |
240 | |
241 | /* | |
242 | * operating-points-v2 not supported, fallback to all CPUs share | |
243 | * OPP for backward compatibility if the platform hasn't set | |
244 | * sharing CPUs. | |
245 | */ | |
873c9851 VK |
246 | if (dev_pm_opp_get_sharing_cpus(cpu_dev, priv->cpus)) |
247 | fallback = true; | |
248 | } | |
249 | ||
250 | /* | |
251 | * Initialize OPP tables for all priv->cpus. They will be shared by | |
252 | * all CPUs which have marked their CPUs shared with OPP bindings. | |
253 | * | |
254 | * For platforms not using operating-points-v2 bindings, we do this | |
255 | * before updating priv->cpus. Otherwise, we will end up creating | |
256 | * duplicate OPPs for the CPUs. | |
257 | * | |
c3135d28 QW |
258 | * OPPs might be populated at runtime, don't fail for error here unless |
259 | * it is -EPROBE_DEFER. | |
873c9851 | 260 | */ |
c3135d28 QW |
261 | ret = dev_pm_opp_of_cpumask_add_table(priv->cpus); |
262 | if (!ret) { | |
873c9851 | 263 | priv->have_static_opps = true; |
c3135d28 QW |
264 | } else if (ret == -EPROBE_DEFER) { |
265 | goto out; | |
266 | } | |
873c9851 VK |
267 | |
268 | /* | |
269 | * The OPP table must be initialized, statically or dynamically, by this | |
270 | * point. | |
271 | */ | |
272 | ret = dev_pm_opp_get_opp_count(cpu_dev); | |
273 | if (ret <= 0) { | |
274 | dev_err(cpu_dev, "OPP table can't be empty\n"); | |
275 | ret = -ENODEV; | |
276 | goto out; | |
277 | } | |
278 | ||
279 | if (fallback) { | |
280 | cpumask_setall(priv->cpus); | |
281 | ret = dev_pm_opp_set_sharing_cpus(cpu_dev, priv->cpus); | |
282 | if (ret) | |
283 | dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n", | |
284 | __func__, ret); | |
285 | } | |
286 | ||
287 | ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &priv->freq_table); | |
288 | if (ret) { | |
289 | dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret); | |
290 | goto out; | |
dc279ac6 SG |
291 | } |
292 | ||
293 | list_add(&priv->node, &priv_list); | |
294 | return 0; | |
295 | ||
873c9851 VK |
296 | out: |
297 | if (priv->have_static_opps) | |
298 | dev_pm_opp_of_cpumask_remove_table(priv->cpus); | |
5f6ffb8d | 299 | dev_pm_opp_put_regulators(priv->opp_table); |
dc279ac6 SG |
300 | free_cpumask: |
301 | free_cpumask_var(priv->cpus); | |
302 | return ret; | |
303 | } | |
304 | ||
305 | static void dt_cpufreq_release(void) | |
306 | { | |
307 | struct private_data *priv, *tmp; | |
308 | ||
309 | list_for_each_entry_safe(priv, tmp, &priv_list, node) { | |
873c9851 VK |
310 | dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &priv->freq_table); |
311 | if (priv->have_static_opps) | |
312 | dev_pm_opp_of_cpumask_remove_table(priv->cpus); | |
5f6ffb8d | 313 | dev_pm_opp_put_regulators(priv->opp_table); |
dc279ac6 SG |
314 | free_cpumask_var(priv->cpus); |
315 | list_del(&priv->node); | |
316 | } | |
317 | } | |
318 | ||
319 | static int dt_cpufreq_probe(struct platform_device *pdev) | |
320 | { | |
321 | struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev); | |
322 | int ret, cpu; | |
323 | ||
324 | /* Request resources early so we can return in case of -EPROBE_DEFER */ | |
325 | for_each_possible_cpu(cpu) { | |
326 | ret = dt_cpufreq_early_init(&pdev->dev, cpu); | |
327 | if (ret) | |
328 | goto err; | |
329 | } | |
d2f31f1d | 330 | |
67782701 VK |
331 | if (data) { |
332 | if (data->have_governor_per_policy) | |
333 | dt_cpufreq_driver.flags |= CPUFREQ_HAVE_GOVERNOR_PER_POLICY; | |
334 | ||
335 | dt_cpufreq_driver.resume = data->resume; | |
336 | if (data->suspend) | |
337 | dt_cpufreq_driver.suspend = data->suspend; | |
0c868627 PF |
338 | if (data->get_intermediate) { |
339 | dt_cpufreq_driver.target_intermediate = data->target_intermediate; | |
340 | dt_cpufreq_driver.get_intermediate = data->get_intermediate; | |
341 | } | |
67782701 | 342 | } |
297a6622 | 343 | |
bbcf0719 | 344 | ret = cpufreq_register_driver(&dt_cpufreq_driver); |
dc279ac6 | 345 | if (ret) { |
dd02a3d9 | 346 | dev_err(&pdev->dev, "failed register driver: %d\n", ret); |
dc279ac6 SG |
347 | goto err; |
348 | } | |
d2f31f1d | 349 | |
dc279ac6 SG |
350 | return 0; |
351 | err: | |
352 | dt_cpufreq_release(); | |
95ceafd4 SG |
353 | return ret; |
354 | } | |
5553f9e2 | 355 | |
bbcf0719 | 356 | static int dt_cpufreq_remove(struct platform_device *pdev) |
5553f9e2 | 357 | { |
bbcf0719 | 358 | cpufreq_unregister_driver(&dt_cpufreq_driver); |
dc279ac6 | 359 | dt_cpufreq_release(); |
5553f9e2 SG |
360 | return 0; |
361 | } | |
362 | ||
bbcf0719 | 363 | static struct platform_driver dt_cpufreq_platdrv = { |
5553f9e2 | 364 | .driver = { |
bbcf0719 | 365 | .name = "cpufreq-dt", |
5553f9e2 | 366 | }, |
bbcf0719 VK |
367 | .probe = dt_cpufreq_probe, |
368 | .remove = dt_cpufreq_remove, | |
5553f9e2 | 369 | }; |
bbcf0719 | 370 | module_platform_driver(dt_cpufreq_platdrv); |
95ceafd4 | 371 | |
07949bf9 | 372 | MODULE_ALIAS("platform:cpufreq-dt"); |
748c8766 | 373 | MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>"); |
95ceafd4 | 374 | MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>"); |
bbcf0719 | 375 | MODULE_DESCRIPTION("Generic cpufreq driver"); |
95ceafd4 | 376 | MODULE_LICENSE("GPL"); |