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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/cpufreq/cpufreq-dt.c
....@@ -1,12 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (C) 2012 Freescale Semiconductor, Inc.
34  *
45  * Copyright (C) 2014 Linaro.
56  * Viresh Kumar <viresh.kumar@linaro.org>
6
- *
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.
107  */
118 
129 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
....@@ -15,8 +12,8 @@
1512 #include <linux/cpu.h>
1613 #include <linux/cpufreq.h>
1714 #include <linux/cpumask.h>
18
-#include <linux/energy_model.h>
1915 #include <linux/err.h>
16
+#include <linux/list.h>
2017 #include <linux/module.h>
2118 #include <linux/of.h>
2219 #include <linux/pm_opp.h>
....@@ -28,20 +25,19 @@
2825 #include "cpufreq-dt.h"
2926 #ifdef CONFIG_ARCH_ROCKCHIP
3027 #include "rockchip-cpufreq.h"
31
-#include <soc/rockchip/rockchip_ipa.h>
32
-#include <soc/rockchip/rockchip_system_monitor.h>
3328 #endif
3429 
3530 struct private_data {
36
-	struct opp_table *opp_table;
31
+	struct list_head node;
32
+
33
+	cpumask_var_t cpus;
3734 	struct device *cpu_dev;
38
-#ifdef CONFIG_ARCH_ROCKCHIP
39
-	struct monitor_dev_info *mdev_info;
40
-	struct monitor_dev_profile *mdevp;
41
-#endif
42
-	const char *reg_name;
35
+	struct opp_table *opp_table;
36
+	struct cpufreq_frequency_table *freq_table;
4337 	bool have_static_opps;
4438 };
39
+
40
+static LIST_HEAD(priv_list);
4541 
4642 static struct freq_attr *cpufreq_dt_attr[] = {
4743 	&cpufreq_freq_attr_scaling_available_freqs,
....@@ -49,28 +45,28 @@
4945 	NULL,
5046 };
5147 
48
+static struct private_data *cpufreq_dt_find_data(int cpu)
49
+{
50
+	struct private_data *priv;
51
+
52
+	list_for_each_entry(priv, &priv_list, node) {
53
+		if (cpumask_test_cpu(cpu, priv->cpus))
54
+			return priv;
55
+	}
56
+
57
+	return NULL;
58
+}
59
+
5260 static int set_target(struct cpufreq_policy *policy, unsigned int index)
5361 {
5462 	struct private_data *priv = policy->driver_data;
5563 	unsigned long freq = policy->freq_table[index].frequency;
56
-	int ret;
5764 
58
-#ifdef CONFIG_ROCKCHIP_SYSTEM_MONITOR
59
-	if (priv->mdev_info)
60
-		ret = rockchip_monitor_opp_set_rate(priv->mdev_info,
61
-						    freq * 1000);
62
-	else
63
-		ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
65
+#ifdef CONFIG_ARCH_ROCKCHIP
66
+	return rockchip_cpufreq_opp_set_rate(priv->cpu_dev, freq * 1000);
6467 #else
65
-	ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
68
+	return dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
6669 #endif
67
-
68
-	if (!ret) {
69
-		arch_set_freq_scale(policy->related_cpus, freq,
70
-				    policy->cpuinfo.max_freq);
71
-	}
72
-
73
-	return ret;
7470 }
7571 
7672 /*
....@@ -111,79 +107,20 @@
111107 	return name;
112108 }
113109 
114
-static int resources_available(void)
115
-{
116
-	struct device *cpu_dev;
117
-	struct regulator *cpu_reg;
118
-	struct clk *cpu_clk;
119
-	int ret = 0;
120
-	const char *name;
121
-
122
-	cpu_dev = get_cpu_device(0);
123
-	if (!cpu_dev) {
124
-		pr_err("failed to get cpu0 device\n");
125
-		return -ENODEV;
126
-	}
127
-
128
-	cpu_clk = clk_get(cpu_dev, NULL);
129
-	ret = PTR_ERR_OR_ZERO(cpu_clk);
130
-	if (ret) {
131
-		/*
132
-		 * If cpu's clk node is present, but clock is not yet
133
-		 * registered, we should try defering probe.
134
-		 */
135
-		if (ret == -EPROBE_DEFER)
136
-			dev_dbg(cpu_dev, "clock not ready, retry\n");
137
-		else
138
-			dev_err(cpu_dev, "failed to get clock: %d\n", ret);
139
-
140
-		return ret;
141
-	}
142
-
143
-	clk_put(cpu_clk);
144
-
145
-	name = find_supply_name(cpu_dev);
146
-	/* Platform doesn't require regulator */
147
-	if (!name)
148
-		return 0;
149
-
150
-	cpu_reg = regulator_get_optional(cpu_dev, name);
151
-	ret = PTR_ERR_OR_ZERO(cpu_reg);
152
-	if (ret) {
153
-		/*
154
-		 * If cpu's regulator supply node is present, but regulator is
155
-		 * not yet registered, we should try defering probe.
156
-		 */
157
-		if (ret == -EPROBE_DEFER)
158
-			dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
159
-		else
160
-			dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
161
-
162
-		return ret;
163
-	}
164
-
165
-	regulator_put(cpu_reg);
166
-	return 0;
167
-}
168
-
169110 static int cpufreq_init(struct cpufreq_policy *policy)
170111 {
171
-	struct em_data_callback em_cb = EM_DATA_CB(of_dev_pm_opp_get_cpu_power);
172
-	struct cpufreq_frequency_table *freq_table;
173
-	struct opp_table *opp_table = NULL;
174112 	struct private_data *priv;
175113 	struct device *cpu_dev;
176114 	struct clk *cpu_clk;
177115 	unsigned int transition_latency;
178
-	bool fallback = false;
179
-	const char *name;
180
-	int ret, nr_opp;
116
+	int ret;
181117 
182
-	cpu_dev = get_cpu_device(policy->cpu);
183
-	if (!cpu_dev) {
184
-		pr_err("failed to get cpu%d device\n", policy->cpu);
118
+	priv = cpufreq_dt_find_data(policy->cpu);
119
+	if (!priv) {
120
+		pr_err("failed to find data for cpu%d\n", policy->cpu);
185121 		return -ENODEV;
186122 	}
123
+	cpu_dev = priv->cpu_dev;
187124 
188125 	cpu_clk = clk_get(cpu_dev, NULL);
189126 	if (IS_ERR(cpu_clk)) {
....@@ -192,195 +129,55 @@
192129 		return ret;
193130 	}
194131 
195
-	/* Get OPP-sharing information from "operating-points-v2" bindings */
196
-	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
197
-	if (ret) {
198
-		if (ret != -ENOENT)
199
-			goto out_put_clk;
132
+	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
133
+	if (!transition_latency)
134
+		transition_latency = CPUFREQ_ETERNAL;
200135 
201
-		/*
202
-		 * operating-points-v2 not supported, fallback to old method of
203
-		 * finding shared-OPPs for backward compatibility if the
204
-		 * platform hasn't set sharing CPUs.
205
-		 */
206
-		if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
207
-			fallback = true;
208
-	}
209
-
210
-	/*
211
-	 * OPP layer will be taking care of regulators now, but it needs to know
212
-	 * the name of the regulator first.
213
-	 */
214
-	name = find_supply_name(cpu_dev);
215
-	if (name) {
216
-		opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
217
-		if (IS_ERR(opp_table)) {
218
-			ret = PTR_ERR(opp_table);
219
-			dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
220
-				policy->cpu, ret);
221
-			goto out_put_clk;
222
-		}
223
-	}
224
-
225
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
226
-	if (!priv) {
227
-		ret = -ENOMEM;
228
-		goto out_put_regulator;
229
-	}
230
-
231
-	priv->reg_name = name;
232
-	priv->opp_table = opp_table;
233
-
234
-	/*
235
-	 * Initialize OPP tables for all policy->cpus. They will be shared by
236
-	 * all CPUs which have marked their CPUs shared with OPP bindings.
237
-	 *
238
-	 * For platforms not using operating-points-v2 bindings, we do this
239
-	 * before updating policy->cpus. Otherwise, we will end up creating
240
-	 * duplicate OPPs for policy->cpus.
241
-	 *
242
-	 * OPPs might be populated at runtime, don't check for error here
243
-	 */
244
-#ifdef CONFIG_ARCH_ROCKCHIP
245
-	rockchip_cpufreq_set_opp_info(cpu_dev);
246
-	ret = dev_pm_opp_of_add_table(cpu_dev);
247
-	if (ret) {
248
-		dev_err(cpu_dev, "couldn't find opp table for cpu:%d, %d\n",
249
-			policy->cpu, ret);
250
-	} else {
251
-		struct cpumask cpus;
252
-
253
-		cpumask_copy(&cpus, policy->cpus);
254
-		cpumask_clear_cpu(policy->cpu, &cpus);
255
-		if (!cpumask_empty(&cpus)) {
256
-			if (!dev_pm_opp_of_cpumask_add_table(&cpus))
257
-				priv->have_static_opps = true;
258
-			else
259
-				dev_pm_opp_of_remove_table(cpu_dev);
260
-		} else {
261
-			priv->have_static_opps = true;
262
-		}
263
-	}
264
-	rockchip_cpufreq_adjust_power_scale(cpu_dev);
265
-#else
266
-	if (!dev_pm_opp_of_cpumask_add_table(policy->cpus))
267
-		priv->have_static_opps = true;
268
-#endif
269
-
270
-	/*
271
-	 * But we need OPP table to function so if it is not there let's
272
-	 * give platform code chance to provide it for us.
273
-	 */
274
-	ret = dev_pm_opp_get_opp_count(cpu_dev);
275
-	if (ret <= 0) {
276
-		dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
277
-		ret = -EPROBE_DEFER;
278
-		goto out_free_opp;
279
-	}
280
-	nr_opp = ret;
281
-
282
-	if (fallback) {
283
-		cpumask_setall(policy->cpus);
284
-
285
-		/*
286
-		 * OPP tables are initialized only for policy->cpu, do it for
287
-		 * others as well.
288
-		 */
289
-		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
290
-		if (ret)
291
-			dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
292
-				__func__, ret);
293
-	}
294
-
295
-	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
296
-	if (ret) {
297
-		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
298
-		goto out_free_opp;
299
-	}
300
-
301
-	priv->cpu_dev = cpu_dev;
136
+	cpumask_copy(policy->cpus, priv->cpus);
302137 	policy->driver_data = priv;
303138 	policy->clk = cpu_clk;
304
-	policy->freq_table = freq_table;
305
-
139
+	policy->freq_table = priv->freq_table;
306140 	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
141
+	policy->cpuinfo.transition_latency = transition_latency;
142
+	policy->dvfs_possible_from_any_cpu = true;
307143 
308144 	/* Support turbo/boost mode */
309145 	if (policy_has_boost_freq(policy)) {
310146 		/* This gets disabled by core on driver unregister */
311147 		ret = cpufreq_enable_boost_support();
312148 		if (ret)
313
-			goto out_free_cpufreq_table;
149
+			goto out_clk_put;
314150 		cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
315151 	}
316152 
317
-	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
318
-	if (!transition_latency)
319
-		transition_latency = CPUFREQ_ETERNAL;
153
+	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
320154 
321
-	policy->cpuinfo.transition_latency = transition_latency;
322
-	policy->dvfs_possible_from_any_cpu = true;
323
-
324
-	em_register_perf_domain(policy->cpus, nr_opp, &em_cb);
325
-
326
-#ifdef CONFIG_ARCH_ROCKCHIP
327
-	priv->mdevp = kzalloc(sizeof(*priv->mdevp), GFP_KERNEL);
328
-	if (!priv->mdevp)
329
-		goto check_rate_volt;
330
-	priv->mdevp->type = MONITOR_TPYE_CPU;
331
-	priv->mdevp->low_temp_adjust = rockchip_monitor_cpu_low_temp_adjust;
332
-	priv->mdevp->high_temp_adjust = rockchip_monitor_cpu_high_temp_adjust;
333
-	cpumask_copy(&priv->mdevp->allowed_cpus, policy->cpus);
334
-	priv->mdev_info = rockchip_system_monitor_register(cpu_dev,
335
-							   priv->mdevp);
336
-	if (IS_ERR(priv->mdev_info)) {
337
-		kfree(priv->mdevp);
338
-		priv->mdevp = NULL;
339
-		dev_dbg(priv->cpu_dev,
340
-			"running cpufreq without system monitor\n");
341
-		priv->mdev_info = NULL;
342
-	}
343
-check_rate_volt:
344
-	rockchip_cpufreq_check_rate_volt(cpu_dev);
345
-#endif
346155 	return 0;
347156 
348
-out_free_cpufreq_table:
349
-	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
350
-out_free_opp:
351
-	if (priv->have_static_opps)
352
-		dev_pm_opp_of_cpumask_remove_table(policy->cpus);
353
-	kfree(priv);
354
-out_put_regulator:
355
-	if (name)
356
-		dev_pm_opp_put_regulators(opp_table);
357
-out_put_clk:
157
+out_clk_put:
358158 	clk_put(cpu_clk);
359159 
360160 	return ret;
361161 }
362162 
163
+static int cpufreq_online(struct cpufreq_policy *policy)
164
+{
165
+	/* We did light-weight tear down earlier, nothing to do here */
166
+	return 0;
167
+}
168
+
169
+static int cpufreq_offline(struct cpufreq_policy *policy)
170
+{
171
+	/*
172
+	 * Preserve policy->driver_data and don't free resources on light-weight
173
+	 * tear down.
174
+	 */
175
+	return 0;
176
+}
177
+
363178 static int cpufreq_exit(struct cpufreq_policy *policy)
364179 {
365
-	struct private_data *priv = policy->driver_data;
366
-
367
-#ifdef CONFIG_ARCH_ROCKCHIP
368
-	rockchip_cpufreq_suspend(policy);
369
-	rockchip_system_monitor_unregister(priv->mdev_info);
370
-	kfree(priv->mdevp);
371
-	priv->mdevp = NULL;
372
-#endif
373
-	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
374
-	if (priv->have_static_opps)
375
-		dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
376
-	if (priv->reg_name)
377
-		dev_pm_opp_put_regulators(priv->opp_table);
378
-#ifdef CONFIG_ARCH_ROCKCHIP
379
-	rockchip_cpufreq_put_opp_info(priv->cpu_dev);
380
-#endif
381180 	clk_put(policy->clk);
382
-	kfree(priv);
383
-
384181 	return 0;
385182 }
386183 
....@@ -392,26 +189,152 @@
392189 	.get = cpufreq_generic_get,
393190 	.init = cpufreq_init,
394191 	.exit = cpufreq_exit,
192
+	.online = cpufreq_online,
193
+	.offline = cpufreq_offline,
395194 	.name = "cpufreq-dt",
396195 	.attr = cpufreq_dt_attr,
397196 	.suspend = cpufreq_generic_suspend,
398197 };
399198 
199
+static int dt_cpufreq_early_init(struct device *dev, int cpu)
200
+{
201
+	struct private_data *priv;
202
+	struct device *cpu_dev;
203
+	bool fallback = false;
204
+	const char *reg_name;
205
+	int ret;
206
+
207
+	/* Check if this CPU is already covered by some other policy */
208
+	if (cpufreq_dt_find_data(cpu))
209
+		return 0;
210
+
211
+	cpu_dev = get_cpu_device(cpu);
212
+	if (!cpu_dev)
213
+		return -EPROBE_DEFER;
214
+
215
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
216
+	if (!priv)
217
+		return -ENOMEM;
218
+
219
+	if (!alloc_cpumask_var(&priv->cpus, GFP_KERNEL))
220
+		return -ENOMEM;
221
+
222
+	cpumask_set_cpu(cpu, priv->cpus);
223
+	priv->cpu_dev = cpu_dev;
224
+
225
+	/*
226
+	 * OPP layer will be taking care of regulators now, but it needs to know
227
+	 * the name of the regulator first.
228
+	 */
229
+	reg_name = find_supply_name(cpu_dev);
230
+	if (reg_name) {
231
+		priv->opp_table = dev_pm_opp_set_regulators(cpu_dev, &reg_name,
232
+							    1);
233
+		if (IS_ERR(priv->opp_table)) {
234
+			ret = PTR_ERR(priv->opp_table);
235
+			if (ret != -EPROBE_DEFER)
236
+				dev_err(cpu_dev, "failed to set regulators: %d\n",
237
+					ret);
238
+			goto free_cpumask;
239
+		}
240
+	}
241
+
242
+	/* Get OPP-sharing information from "operating-points-v2" bindings */
243
+	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->cpus);
244
+	if (ret) {
245
+		if (ret != -ENOENT)
246
+			goto out;
247
+
248
+		/*
249
+		 * operating-points-v2 not supported, fallback to all CPUs share
250
+		 * OPP for backward compatibility if the platform hasn't set
251
+		 * sharing CPUs.
252
+		 */
253
+		if (dev_pm_opp_get_sharing_cpus(cpu_dev, priv->cpus))
254
+			fallback = true;
255
+	}
256
+
257
+	/*
258
+	 * Initialize OPP tables for all priv->cpus. They will be shared by
259
+	 * all CPUs which have marked their CPUs shared with OPP bindings.
260
+	 *
261
+	 * For platforms not using operating-points-v2 bindings, we do this
262
+	 * before updating priv->cpus. Otherwise, we will end up creating
263
+	 * duplicate OPPs for the CPUs.
264
+	 *
265
+	 * OPPs might be populated at runtime, don't check for error here.
266
+	 */
267
+	if (!dev_pm_opp_of_cpumask_add_table(priv->cpus))
268
+		priv->have_static_opps = true;
269
+
270
+	/*
271
+	 * The OPP table must be initialized, statically or dynamically, by this
272
+	 * point.
273
+	 */
274
+	ret = dev_pm_opp_get_opp_count(cpu_dev);
275
+	if (ret <= 0) {
276
+		dev_err(cpu_dev, "OPP table can't be empty\n");
277
+		ret = -ENODEV;
278
+		goto out;
279
+	}
280
+
281
+	if (fallback) {
282
+		cpumask_setall(priv->cpus);
283
+		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, priv->cpus);
284
+		if (ret)
285
+			dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
286
+				__func__, ret);
287
+	}
288
+
289
+#ifdef CONFIG_ARCH_ROCKCHIP
290
+	rockchip_cpufreq_adjust_power_scale(cpu_dev);
291
+#endif
292
+
293
+	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &priv->freq_table);
294
+	if (ret) {
295
+		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
296
+		goto out;
297
+	}
298
+
299
+	list_add(&priv->node, &priv_list);
300
+	return 0;
301
+
302
+out:
303
+	if (priv->have_static_opps)
304
+		dev_pm_opp_of_cpumask_remove_table(priv->cpus);
305
+	if (priv->opp_table)
306
+		dev_pm_opp_put_regulators(priv->opp_table);
307
+free_cpumask:
308
+	free_cpumask_var(priv->cpus);
309
+	return ret;
310
+}
311
+
312
+static void dt_cpufreq_release(void)
313
+{
314
+	struct private_data *priv, *tmp;
315
+
316
+	list_for_each_entry_safe(priv, tmp, &priv_list, node) {
317
+		dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &priv->freq_table);
318
+		if (priv->have_static_opps)
319
+			dev_pm_opp_of_cpumask_remove_table(priv->cpus);
320
+		if (priv->opp_table)
321
+			dev_pm_opp_put_regulators(priv->opp_table);
322
+		free_cpumask_var(priv->cpus);
323
+		list_del(&priv->node);
324
+	}
325
+}
326
+
400327 static int dt_cpufreq_probe(struct platform_device *pdev)
401328 {
402329 	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
403
-	int ret;
330
+	int ret, cpu;
404331 
405
-	/*
406
-	 * All per-cluster (CPUs sharing clock/voltages) initialization is done
407
-	 * from ->init(). In probe(), we just need to make sure that clk and
408
-	 * regulators are available. Else defer probe and retry.
409
-	 *
410
-	 * FIXME: Is checking this only for CPU0 sufficient ?
411
-	 */
412
-	ret = resources_available();
413
-	if (ret)
414
-		return ret;
332
+	/* Request resources early so we can return in case of -EPROBE_DEFER */
333
+	for_each_possible_cpu(cpu) {
334
+		ret = dt_cpufreq_early_init(&pdev->dev, cpu);
335
+		if (ret)
336
+			goto err;
337
+	}
415338 
416339 	if (data) {
417340 		if (data->have_governor_per_policy)
....@@ -420,18 +343,28 @@
420343 		dt_cpufreq_driver.resume = data->resume;
421344 		if (data->suspend)
422345 			dt_cpufreq_driver.suspend = data->suspend;
346
+		if (data->get_intermediate) {
347
+			dt_cpufreq_driver.target_intermediate = data->target_intermediate;
348
+			dt_cpufreq_driver.get_intermediate = data->get_intermediate;
349
+		}
423350 	}
424351 
425352 	ret = cpufreq_register_driver(&dt_cpufreq_driver);
426
-	if (ret)
353
+	if (ret) {
427354 		dev_err(&pdev->dev, "failed register driver: %d\n", ret);
355
+		goto err;
356
+	}
428357 
358
+	return 0;
359
+err:
360
+	dt_cpufreq_release();
429361 	return ret;
430362 }
431363 
432364 static int dt_cpufreq_remove(struct platform_device *pdev)
433365 {
434366 	cpufreq_unregister_driver(&dt_cpufreq_driver);
367
+	dt_cpufreq_release();
435368 	return 0;
436369 }
437370