1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015 Linaro Ltd.
4 * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
5 */
6
7 #include <linux/clk.h>
8 #include <linux/cpu.h>
9 #include <linux/cpufreq.h>
10 #include <linux/cpumask.h>
11 #include <linux/minmax.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_platform.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_opp.h>
17 #include <linux/regulator/consumer.h>
18
19 struct mtk_cpufreq_platform_data {
20 int min_volt_shift;
21 int max_volt_shift;
22 int proc_max_volt;
23 int sram_min_volt;
24 int sram_max_volt;
25 bool ccifreq_supported;
26 };
27
28 /*
29 * The struct mtk_cpu_dvfs_info holds necessary information for doing CPU DVFS
30 * on each CPU power/clock domain of Mediatek SoCs. Each CPU cluster in
31 * Mediatek SoCs has two voltage inputs, Vproc and Vsram. In some cases the two
32 * voltage inputs need to be controlled under a hardware limitation:
33 * 100mV < Vsram - Vproc < 200mV
34 *
35 * When scaling the clock frequency of a CPU clock domain, the clock source
36 * needs to be switched to another stable PLL clock temporarily until
37 * the original PLL becomes stable at target frequency.
38 */
39 struct mtk_cpu_dvfs_info {
40 struct cpumask cpus;
41 struct device *cpu_dev;
42 struct device *cci_dev;
43 struct regulator *proc_reg;
44 struct regulator *sram_reg;
45 struct clk *cpu_clk;
46 struct clk *inter_clk;
47 struct list_head list_head;
48 int intermediate_voltage;
49 bool need_voltage_tracking;
50 int vproc_on_boot;
51 int pre_vproc;
52 /* Avoid race condition for regulators between notify and policy */
53 struct mutex reg_lock;
54 struct notifier_block opp_nb;
55 unsigned int opp_cpu;
56 unsigned long current_freq;
57 const struct mtk_cpufreq_platform_data *soc_data;
58 int vtrack_max;
59 bool ccifreq_bound;
60 };
61
62 static struct platform_device *cpufreq_pdev;
63
64 static LIST_HEAD(dvfs_info_list);
65
mtk_cpu_dvfs_info_lookup(int cpu)66 static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu)
67 {
68 struct mtk_cpu_dvfs_info *info;
69
70 list_for_each_entry(info, &dvfs_info_list, list_head) {
71 if (cpumask_test_cpu(cpu, &info->cpus))
72 return info;
73 }
74
75 return NULL;
76 }
77
mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info * info,int new_vproc)78 static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
79 int new_vproc)
80 {
81 const struct mtk_cpufreq_platform_data *soc_data = info->soc_data;
82 struct regulator *proc_reg = info->proc_reg;
83 struct regulator *sram_reg = info->sram_reg;
84 int pre_vproc, pre_vsram, new_vsram, vsram, vproc, ret;
85 int retry = info->vtrack_max;
86
87 pre_vproc = regulator_get_voltage(proc_reg);
88 if (pre_vproc < 0) {
89 dev_err(info->cpu_dev,
90 "invalid Vproc value: %d\n", pre_vproc);
91 return pre_vproc;
92 }
93
94 pre_vsram = regulator_get_voltage(sram_reg);
95 if (pre_vsram < 0) {
96 dev_err(info->cpu_dev, "invalid Vsram value: %d\n", pre_vsram);
97 return pre_vsram;
98 }
99
100 new_vsram = clamp(new_vproc + soc_data->min_volt_shift,
101 soc_data->sram_min_volt, soc_data->sram_max_volt);
102
103 do {
104 if (pre_vproc <= new_vproc) {
105 vsram = clamp(pre_vproc + soc_data->max_volt_shift,
106 soc_data->sram_min_volt, new_vsram);
107 ret = regulator_set_voltage(sram_reg, vsram,
108 soc_data->sram_max_volt);
109
110 if (ret)
111 return ret;
112
113 if (vsram == soc_data->sram_max_volt ||
114 new_vsram == soc_data->sram_min_volt)
115 vproc = new_vproc;
116 else
117 vproc = vsram - soc_data->min_volt_shift;
118
119 ret = regulator_set_voltage(proc_reg, vproc,
120 soc_data->proc_max_volt);
121 if (ret) {
122 regulator_set_voltage(sram_reg, pre_vsram,
123 soc_data->sram_max_volt);
124 return ret;
125 }
126 } else if (pre_vproc > new_vproc) {
127 vproc = max(new_vproc,
128 pre_vsram - soc_data->max_volt_shift);
129 ret = regulator_set_voltage(proc_reg, vproc,
130 soc_data->proc_max_volt);
131 if (ret)
132 return ret;
133
134 if (vproc == new_vproc)
135 vsram = new_vsram;
136 else
137 vsram = max(new_vsram,
138 vproc + soc_data->min_volt_shift);
139
140 ret = regulator_set_voltage(sram_reg, vsram,
141 soc_data->sram_max_volt);
142 if (ret) {
143 regulator_set_voltage(proc_reg, pre_vproc,
144 soc_data->proc_max_volt);
145 return ret;
146 }
147 }
148
149 pre_vproc = vproc;
150 pre_vsram = vsram;
151
152 if (--retry < 0) {
153 dev_err(info->cpu_dev,
154 "over loop count, failed to set voltage\n");
155 return -EINVAL;
156 }
157 } while (vproc != new_vproc || vsram != new_vsram);
158
159 return 0;
160 }
161
mtk_cpufreq_set_voltage(struct mtk_cpu_dvfs_info * info,int vproc)162 static int mtk_cpufreq_set_voltage(struct mtk_cpu_dvfs_info *info, int vproc)
163 {
164 const struct mtk_cpufreq_platform_data *soc_data = info->soc_data;
165 int ret;
166
167 if (info->need_voltage_tracking)
168 ret = mtk_cpufreq_voltage_tracking(info, vproc);
169 else
170 ret = regulator_set_voltage(info->proc_reg, vproc,
171 soc_data->proc_max_volt);
172 if (!ret)
173 info->pre_vproc = vproc;
174
175 return ret;
176 }
177
is_ccifreq_ready(struct mtk_cpu_dvfs_info * info)178 static bool is_ccifreq_ready(struct mtk_cpu_dvfs_info *info)
179 {
180 struct device_link *sup_link;
181
182 if (info->ccifreq_bound)
183 return true;
184
185 sup_link = device_link_add(info->cpu_dev, info->cci_dev,
186 DL_FLAG_AUTOREMOVE_CONSUMER);
187 if (!sup_link) {
188 dev_err(info->cpu_dev, "cpu%d: sup_link is NULL\n", info->opp_cpu);
189 return false;
190 }
191
192 if (sup_link->supplier->links.status != DL_DEV_DRIVER_BOUND)
193 return false;
194
195 info->ccifreq_bound = true;
196
197 return true;
198 }
199
mtk_cpufreq_set_target(struct cpufreq_policy * policy,unsigned int index)200 static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
201 unsigned int index)
202 {
203 struct cpufreq_frequency_table *freq_table = policy->freq_table;
204 struct clk *cpu_clk = policy->clk;
205 struct clk *armpll = clk_get_parent(cpu_clk);
206 struct mtk_cpu_dvfs_info *info = policy->driver_data;
207 struct device *cpu_dev = info->cpu_dev;
208 struct dev_pm_opp *opp;
209 long freq_hz, pre_freq_hz;
210 int vproc, pre_vproc, inter_vproc, target_vproc, ret;
211
212 inter_vproc = info->intermediate_voltage;
213
214 pre_freq_hz = clk_get_rate(cpu_clk);
215
216 mutex_lock(&info->reg_lock);
217
218 if (unlikely(info->pre_vproc <= 0))
219 pre_vproc = regulator_get_voltage(info->proc_reg);
220 else
221 pre_vproc = info->pre_vproc;
222
223 if (pre_vproc < 0) {
224 dev_err(cpu_dev, "invalid Vproc value: %d\n", pre_vproc);
225 ret = pre_vproc;
226 goto out;
227 }
228
229 freq_hz = freq_table[index].frequency * 1000;
230
231 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
232 if (IS_ERR(opp)) {
233 dev_err(cpu_dev, "cpu%d: failed to find OPP for %ld\n",
234 policy->cpu, freq_hz);
235 ret = PTR_ERR(opp);
236 goto out;
237 }
238 vproc = dev_pm_opp_get_voltage(opp);
239 dev_pm_opp_put(opp);
240
241 /*
242 * If MediaTek cci is supported but is not ready, we will use the value
243 * of max(target cpu voltage, booting voltage) to prevent high freqeuncy
244 * low voltage crash.
245 */
246 if (info->soc_data->ccifreq_supported && !is_ccifreq_ready(info))
247 vproc = max(vproc, info->vproc_on_boot);
248
249 /*
250 * If the new voltage or the intermediate voltage is higher than the
251 * current voltage, scale up voltage first.
252 */
253 target_vproc = max(inter_vproc, vproc);
254 if (pre_vproc <= target_vproc) {
255 ret = mtk_cpufreq_set_voltage(info, target_vproc);
256 if (ret) {
257 dev_err(cpu_dev,
258 "cpu%d: failed to scale up voltage!\n", policy->cpu);
259 mtk_cpufreq_set_voltage(info, pre_vproc);
260 goto out;
261 }
262 }
263
264 /* Reparent the CPU clock to intermediate clock. */
265 ret = clk_set_parent(cpu_clk, info->inter_clk);
266 if (ret) {
267 dev_err(cpu_dev,
268 "cpu%d: failed to re-parent cpu clock!\n", policy->cpu);
269 mtk_cpufreq_set_voltage(info, pre_vproc);
270 goto out;
271 }
272
273 /* Set the original PLL to target rate. */
274 ret = clk_set_rate(armpll, freq_hz);
275 if (ret) {
276 dev_err(cpu_dev,
277 "cpu%d: failed to scale cpu clock rate!\n", policy->cpu);
278 clk_set_parent(cpu_clk, armpll);
279 mtk_cpufreq_set_voltage(info, pre_vproc);
280 goto out;
281 }
282
283 /* Set parent of CPU clock back to the original PLL. */
284 ret = clk_set_parent(cpu_clk, armpll);
285 if (ret) {
286 dev_err(cpu_dev,
287 "cpu%d: failed to re-parent cpu clock!\n", policy->cpu);
288 mtk_cpufreq_set_voltage(info, inter_vproc);
289 goto out;
290 }
291
292 /*
293 * If the new voltage is lower than the intermediate voltage or the
294 * original voltage, scale down to the new voltage.
295 */
296 if (vproc < inter_vproc || vproc < pre_vproc) {
297 ret = mtk_cpufreq_set_voltage(info, vproc);
298 if (ret) {
299 dev_err(cpu_dev,
300 "cpu%d: failed to scale down voltage!\n", policy->cpu);
301 clk_set_parent(cpu_clk, info->inter_clk);
302 clk_set_rate(armpll, pre_freq_hz);
303 clk_set_parent(cpu_clk, armpll);
304 goto out;
305 }
306 }
307
308 info->current_freq = freq_hz;
309
310 out:
311 mutex_unlock(&info->reg_lock);
312
313 return ret;
314 }
315
316 #define DYNAMIC_POWER "dynamic-power-coefficient"
317
mtk_cpufreq_opp_notifier(struct notifier_block * nb,unsigned long event,void * data)318 static int mtk_cpufreq_opp_notifier(struct notifier_block *nb,
319 unsigned long event, void *data)
320 {
321 struct dev_pm_opp *opp = data;
322 struct dev_pm_opp *new_opp;
323 struct mtk_cpu_dvfs_info *info;
324 unsigned long freq, volt;
325 struct cpufreq_policy *policy;
326 int ret = 0;
327
328 info = container_of(nb, struct mtk_cpu_dvfs_info, opp_nb);
329
330 if (event == OPP_EVENT_ADJUST_VOLTAGE) {
331 freq = dev_pm_opp_get_freq(opp);
332
333 mutex_lock(&info->reg_lock);
334 if (info->current_freq == freq) {
335 volt = dev_pm_opp_get_voltage(opp);
336 ret = mtk_cpufreq_set_voltage(info, volt);
337 if (ret)
338 dev_err(info->cpu_dev,
339 "failed to scale voltage: %d\n", ret);
340 }
341 mutex_unlock(&info->reg_lock);
342 } else if (event == OPP_EVENT_DISABLE) {
343 freq = dev_pm_opp_get_freq(opp);
344
345 /* case of current opp item is disabled */
346 if (info->current_freq == freq) {
347 freq = 1;
348 new_opp = dev_pm_opp_find_freq_ceil(info->cpu_dev,
349 &freq);
350 if (IS_ERR(new_opp)) {
351 dev_err(info->cpu_dev,
352 "all opp items are disabled\n");
353 ret = PTR_ERR(new_opp);
354 return notifier_from_errno(ret);
355 }
356
357 dev_pm_opp_put(new_opp);
358 policy = cpufreq_cpu_get(info->opp_cpu);
359 if (policy) {
360 cpufreq_driver_target(policy, freq / 1000,
361 CPUFREQ_RELATION_L);
362 cpufreq_cpu_put(policy);
363 }
364 }
365 }
366
367 return notifier_from_errno(ret);
368 }
369
of_get_cci(struct device * cpu_dev)370 static struct device *of_get_cci(struct device *cpu_dev)
371 {
372 struct device_node *np;
373 struct platform_device *pdev;
374
375 np = of_parse_phandle(cpu_dev->of_node, "mediatek,cci", 0);
376 if (IS_ERR_OR_NULL(np))
377 return NULL;
378
379 pdev = of_find_device_by_node(np);
380 of_node_put(np);
381 if (IS_ERR_OR_NULL(pdev))
382 return NULL;
383
384 return &pdev->dev;
385 }
386
mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info * info,int cpu)387 static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
388 {
389 struct device *cpu_dev;
390 struct dev_pm_opp *opp;
391 unsigned long rate;
392 int ret;
393
394 cpu_dev = get_cpu_device(cpu);
395 if (!cpu_dev) {
396 dev_err(cpu_dev, "failed to get cpu%d device\n", cpu);
397 return -ENODEV;
398 }
399 info->cpu_dev = cpu_dev;
400
401 info->ccifreq_bound = false;
402 if (info->soc_data->ccifreq_supported) {
403 info->cci_dev = of_get_cci(info->cpu_dev);
404 if (IS_ERR_OR_NULL(info->cci_dev)) {
405 ret = PTR_ERR(info->cci_dev);
406 dev_err(cpu_dev, "cpu%d: failed to get cci device\n", cpu);
407 return -ENODEV;
408 }
409 }
410
411 info->cpu_clk = clk_get(cpu_dev, "cpu");
412 if (IS_ERR(info->cpu_clk)) {
413 ret = PTR_ERR(info->cpu_clk);
414 return dev_err_probe(cpu_dev, ret,
415 "cpu%d: failed to get cpu clk\n", cpu);
416 }
417
418 info->inter_clk = clk_get(cpu_dev, "intermediate");
419 if (IS_ERR(info->inter_clk)) {
420 ret = PTR_ERR(info->inter_clk);
421 dev_err_probe(cpu_dev, ret,
422 "cpu%d: failed to get intermediate clk\n", cpu);
423 goto out_free_resources;
424 }
425
426 info->proc_reg = regulator_get_optional(cpu_dev, "proc");
427 if (IS_ERR(info->proc_reg)) {
428 ret = PTR_ERR(info->proc_reg);
429 dev_err_probe(cpu_dev, ret,
430 "cpu%d: failed to get proc regulator\n", cpu);
431 goto out_free_resources;
432 }
433
434 ret = regulator_enable(info->proc_reg);
435 if (ret) {
436 dev_warn(cpu_dev, "cpu%d: failed to enable vproc\n", cpu);
437 goto out_free_resources;
438 }
439
440 /* Both presence and absence of sram regulator are valid cases. */
441 info->sram_reg = regulator_get_optional(cpu_dev, "sram");
442 if (IS_ERR(info->sram_reg)) {
443 ret = PTR_ERR(info->sram_reg);
444 if (ret == -EPROBE_DEFER)
445 goto out_free_resources;
446
447 info->sram_reg = NULL;
448 } else {
449 ret = regulator_enable(info->sram_reg);
450 if (ret) {
451 dev_warn(cpu_dev, "cpu%d: failed to enable vsram\n", cpu);
452 goto out_free_resources;
453 }
454 }
455
456 /* Get OPP-sharing information from "operating-points-v2" bindings */
457 ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, &info->cpus);
458 if (ret) {
459 dev_err(cpu_dev,
460 "cpu%d: failed to get OPP-sharing information\n", cpu);
461 goto out_free_resources;
462 }
463
464 ret = dev_pm_opp_of_cpumask_add_table(&info->cpus);
465 if (ret) {
466 dev_warn(cpu_dev, "cpu%d: no OPP table\n", cpu);
467 goto out_free_resources;
468 }
469
470 ret = clk_prepare_enable(info->cpu_clk);
471 if (ret)
472 goto out_free_opp_table;
473
474 ret = clk_prepare_enable(info->inter_clk);
475 if (ret)
476 goto out_disable_mux_clock;
477
478 if (info->soc_data->ccifreq_supported) {
479 info->vproc_on_boot = regulator_get_voltage(info->proc_reg);
480 if (info->vproc_on_boot < 0) {
481 ret = info->vproc_on_boot;
482 dev_err(info->cpu_dev,
483 "invalid Vproc value: %d\n", info->vproc_on_boot);
484 goto out_disable_inter_clock;
485 }
486 }
487
488 /* Search a safe voltage for intermediate frequency. */
489 rate = clk_get_rate(info->inter_clk);
490 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
491 if (IS_ERR(opp)) {
492 dev_err(cpu_dev, "cpu%d: failed to get intermediate opp\n", cpu);
493 ret = PTR_ERR(opp);
494 goto out_disable_inter_clock;
495 }
496 info->intermediate_voltage = dev_pm_opp_get_voltage(opp);
497 dev_pm_opp_put(opp);
498
499 mutex_init(&info->reg_lock);
500 info->current_freq = clk_get_rate(info->cpu_clk);
501
502 info->opp_cpu = cpu;
503 info->opp_nb.notifier_call = mtk_cpufreq_opp_notifier;
504 ret = dev_pm_opp_register_notifier(cpu_dev, &info->opp_nb);
505 if (ret) {
506 dev_err(cpu_dev, "cpu%d: failed to register opp notifier\n", cpu);
507 goto out_disable_inter_clock;
508 }
509
510 /*
511 * If SRAM regulator is present, software "voltage tracking" is needed
512 * for this CPU power domain.
513 */
514 info->need_voltage_tracking = (info->sram_reg != NULL);
515
516 /*
517 * We assume min voltage is 0 and tracking target voltage using
518 * min_volt_shift for each iteration.
519 * The vtrack_max is 3 times of expeted iteration count.
520 */
521 info->vtrack_max = 3 * DIV_ROUND_UP(max(info->soc_data->sram_max_volt,
522 info->soc_data->proc_max_volt),
523 info->soc_data->min_volt_shift);
524
525 return 0;
526
527 out_disable_inter_clock:
528 clk_disable_unprepare(info->inter_clk);
529
530 out_disable_mux_clock:
531 clk_disable_unprepare(info->cpu_clk);
532
533 out_free_opp_table:
534 dev_pm_opp_of_cpumask_remove_table(&info->cpus);
535
536 out_free_resources:
537 if (regulator_is_enabled(info->proc_reg))
538 regulator_disable(info->proc_reg);
539 if (info->sram_reg && regulator_is_enabled(info->sram_reg))
540 regulator_disable(info->sram_reg);
541
542 if (!IS_ERR(info->proc_reg))
543 regulator_put(info->proc_reg);
544 if (!IS_ERR(info->sram_reg))
545 regulator_put(info->sram_reg);
546 if (!IS_ERR(info->cpu_clk))
547 clk_put(info->cpu_clk);
548 if (!IS_ERR(info->inter_clk))
549 clk_put(info->inter_clk);
550
551 return ret;
552 }
553
mtk_cpu_dvfs_info_release(struct mtk_cpu_dvfs_info * info)554 static void mtk_cpu_dvfs_info_release(struct mtk_cpu_dvfs_info *info)
555 {
556 if (!IS_ERR(info->proc_reg)) {
557 regulator_disable(info->proc_reg);
558 regulator_put(info->proc_reg);
559 }
560 if (!IS_ERR(info->sram_reg)) {
561 regulator_disable(info->sram_reg);
562 regulator_put(info->sram_reg);
563 }
564 if (!IS_ERR(info->cpu_clk)) {
565 clk_disable_unprepare(info->cpu_clk);
566 clk_put(info->cpu_clk);
567 }
568 if (!IS_ERR(info->inter_clk)) {
569 clk_disable_unprepare(info->inter_clk);
570 clk_put(info->inter_clk);
571 }
572
573 dev_pm_opp_of_cpumask_remove_table(&info->cpus);
574 dev_pm_opp_unregister_notifier(info->cpu_dev, &info->opp_nb);
575 }
576
mtk_cpufreq_init(struct cpufreq_policy * policy)577 static int mtk_cpufreq_init(struct cpufreq_policy *policy)
578 {
579 struct mtk_cpu_dvfs_info *info;
580 struct cpufreq_frequency_table *freq_table;
581 int ret;
582
583 info = mtk_cpu_dvfs_info_lookup(policy->cpu);
584 if (!info) {
585 pr_err("dvfs info for cpu%d is not initialized.\n",
586 policy->cpu);
587 return -EINVAL;
588 }
589
590 ret = dev_pm_opp_init_cpufreq_table(info->cpu_dev, &freq_table);
591 if (ret) {
592 dev_err(info->cpu_dev,
593 "failed to init cpufreq table for cpu%d: %d\n",
594 policy->cpu, ret);
595 return ret;
596 }
597
598 cpumask_copy(policy->cpus, &info->cpus);
599 policy->freq_table = freq_table;
600 policy->driver_data = info;
601 policy->clk = info->cpu_clk;
602
603 return 0;
604 }
605
mtk_cpufreq_exit(struct cpufreq_policy * policy)606 static int mtk_cpufreq_exit(struct cpufreq_policy *policy)
607 {
608 struct mtk_cpu_dvfs_info *info = policy->driver_data;
609
610 dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table);
611
612 return 0;
613 }
614
615 static struct cpufreq_driver mtk_cpufreq_driver = {
616 .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
617 CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
618 CPUFREQ_IS_COOLING_DEV,
619 .verify = cpufreq_generic_frequency_table_verify,
620 .target_index = mtk_cpufreq_set_target,
621 .get = cpufreq_generic_get,
622 .init = mtk_cpufreq_init,
623 .exit = mtk_cpufreq_exit,
624 .register_em = cpufreq_register_em_with_opp,
625 .name = "mtk-cpufreq",
626 .attr = cpufreq_generic_attr,
627 };
628
mtk_cpufreq_probe(struct platform_device * pdev)629 static int mtk_cpufreq_probe(struct platform_device *pdev)
630 {
631 const struct mtk_cpufreq_platform_data *data;
632 struct mtk_cpu_dvfs_info *info, *tmp;
633 int cpu, ret;
634
635 data = dev_get_platdata(&pdev->dev);
636 if (!data) {
637 dev_err(&pdev->dev,
638 "failed to get mtk cpufreq platform data\n");
639 return -ENODEV;
640 }
641
642 for_each_possible_cpu(cpu) {
643 info = mtk_cpu_dvfs_info_lookup(cpu);
644 if (info)
645 continue;
646
647 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
648 if (!info) {
649 ret = -ENOMEM;
650 goto release_dvfs_info_list;
651 }
652
653 info->soc_data = data;
654 ret = mtk_cpu_dvfs_info_init(info, cpu);
655 if (ret) {
656 dev_err(&pdev->dev,
657 "failed to initialize dvfs info for cpu%d\n",
658 cpu);
659 goto release_dvfs_info_list;
660 }
661
662 list_add(&info->list_head, &dvfs_info_list);
663 }
664
665 ret = cpufreq_register_driver(&mtk_cpufreq_driver);
666 if (ret) {
667 dev_err(&pdev->dev, "failed to register mtk cpufreq driver\n");
668 goto release_dvfs_info_list;
669 }
670
671 return 0;
672
673 release_dvfs_info_list:
674 list_for_each_entry_safe(info, tmp, &dvfs_info_list, list_head) {
675 mtk_cpu_dvfs_info_release(info);
676 list_del(&info->list_head);
677 }
678
679 return ret;
680 }
681
682 static struct platform_driver mtk_cpufreq_platdrv = {
683 .driver = {
684 .name = "mtk-cpufreq",
685 },
686 .probe = mtk_cpufreq_probe,
687 };
688
689 static const struct mtk_cpufreq_platform_data mt2701_platform_data = {
690 .min_volt_shift = 100000,
691 .max_volt_shift = 200000,
692 .proc_max_volt = 1150000,
693 .sram_min_volt = 0,
694 .sram_max_volt = 1150000,
695 .ccifreq_supported = false,
696 };
697
698 static const struct mtk_cpufreq_platform_data mt8183_platform_data = {
699 .min_volt_shift = 100000,
700 .max_volt_shift = 200000,
701 .proc_max_volt = 1150000,
702 .sram_min_volt = 0,
703 .sram_max_volt = 1150000,
704 .ccifreq_supported = true,
705 };
706
707 static const struct mtk_cpufreq_platform_data mt8186_platform_data = {
708 .min_volt_shift = 100000,
709 .max_volt_shift = 250000,
710 .proc_max_volt = 1118750,
711 .sram_min_volt = 850000,
712 .sram_max_volt = 1118750,
713 .ccifreq_supported = true,
714 };
715
716 /* List of machines supported by this driver */
717 static const struct of_device_id mtk_cpufreq_machines[] __initconst = {
718 { .compatible = "mediatek,mt2701", .data = &mt2701_platform_data },
719 { .compatible = "mediatek,mt2712", .data = &mt2701_platform_data },
720 { .compatible = "mediatek,mt7622", .data = &mt2701_platform_data },
721 { .compatible = "mediatek,mt7623", .data = &mt2701_platform_data },
722 { .compatible = "mediatek,mt8167", .data = &mt2701_platform_data },
723 { .compatible = "mediatek,mt817x", .data = &mt2701_platform_data },
724 { .compatible = "mediatek,mt8173", .data = &mt2701_platform_data },
725 { .compatible = "mediatek,mt8176", .data = &mt2701_platform_data },
726 { .compatible = "mediatek,mt8183", .data = &mt8183_platform_data },
727 { .compatible = "mediatek,mt8186", .data = &mt8186_platform_data },
728 { .compatible = "mediatek,mt8365", .data = &mt2701_platform_data },
729 { .compatible = "mediatek,mt8516", .data = &mt2701_platform_data },
730 { }
731 };
732 MODULE_DEVICE_TABLE(of, mtk_cpufreq_machines);
733
mtk_cpufreq_driver_init(void)734 static int __init mtk_cpufreq_driver_init(void)
735 {
736 struct device_node *np;
737 const struct of_device_id *match;
738 const struct mtk_cpufreq_platform_data *data;
739 int err;
740
741 np = of_find_node_by_path("/");
742 if (!np)
743 return -ENODEV;
744
745 match = of_match_node(mtk_cpufreq_machines, np);
746 of_node_put(np);
747 if (!match) {
748 pr_debug("Machine is not compatible with mtk-cpufreq\n");
749 return -ENODEV;
750 }
751 data = match->data;
752
753 err = platform_driver_register(&mtk_cpufreq_platdrv);
754 if (err)
755 return err;
756
757 /*
758 * Since there's no place to hold device registration code and no
759 * device tree based way to match cpufreq driver yet, both the driver
760 * and the device registration codes are put here to handle defer
761 * probing.
762 */
763 cpufreq_pdev = platform_device_register_data(NULL, "mtk-cpufreq", -1,
764 data, sizeof(*data));
765 if (IS_ERR(cpufreq_pdev)) {
766 pr_err("failed to register mtk-cpufreq platform device\n");
767 platform_driver_unregister(&mtk_cpufreq_platdrv);
768 return PTR_ERR(cpufreq_pdev);
769 }
770
771 return 0;
772 }
module_init(mtk_cpufreq_driver_init)773 module_init(mtk_cpufreq_driver_init)
774
775 static void __exit mtk_cpufreq_driver_exit(void)
776 {
777 platform_device_unregister(cpufreq_pdev);
778 platform_driver_unregister(&mtk_cpufreq_platdrv);
779 }
780 module_exit(mtk_cpufreq_driver_exit)
781
782 MODULE_DESCRIPTION("MediaTek CPUFreq driver");
783 MODULE_AUTHOR("Pi-Cheng Chen <pi-cheng.chen@linaro.org>");
784 MODULE_LICENSE("GPL v2");
785
