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
 19struct 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 */
 39struct 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
 62static struct platform_device *cpufreq_pdev;
 63
 64static LIST_HEAD(dvfs_info_list);
 65
 66static 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
 78static 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
162static 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
178static 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
200static 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
310out:
311	mutex_unlock(&info->reg_lock);
312
313	return ret;
314}
315
316static int mtk_cpufreq_opp_notifier(struct notifier_block *nb,
317				    unsigned long event, void *data)
318{
319	struct dev_pm_opp *opp = data;
320	struct dev_pm_opp *new_opp;
321	struct mtk_cpu_dvfs_info *info;
322	unsigned long freq, volt;
323	struct cpufreq_policy *policy;
324	int ret = 0;
325
326	info = container_of(nb, struct mtk_cpu_dvfs_info, opp_nb);
327
328	if (event == OPP_EVENT_ADJUST_VOLTAGE) {
329		freq = dev_pm_opp_get_freq(opp);
330
331		mutex_lock(&info->reg_lock);
332		if (info->current_freq == freq) {
333			volt = dev_pm_opp_get_voltage(opp);
334			ret = mtk_cpufreq_set_voltage(info, volt);
335			if (ret)
336				dev_err(info->cpu_dev,
337					"failed to scale voltage: %d\n", ret);
338		}
339		mutex_unlock(&info->reg_lock);
340	} else if (event == OPP_EVENT_DISABLE) {
341		freq = dev_pm_opp_get_freq(opp);
342
343		/* case of current opp item is disabled */
344		if (info->current_freq == freq) {
345			freq = 1;
346			new_opp = dev_pm_opp_find_freq_ceil(info->cpu_dev,
347							    &freq);
348			if (IS_ERR(new_opp)) {
349				dev_err(info->cpu_dev,
350					"all opp items are disabled\n");
351				ret = PTR_ERR(new_opp);
352				return notifier_from_errno(ret);
353			}
354
355			dev_pm_opp_put(new_opp);
356			policy = cpufreq_cpu_get(info->opp_cpu);
357			if (policy) {
358				cpufreq_driver_target(policy, freq / 1000,
359						      CPUFREQ_RELATION_L);
360				cpufreq_cpu_put(policy);
361			}
362		}
363	}
364
365	return notifier_from_errno(ret);
366}
367
368static struct device *of_get_cci(struct device *cpu_dev)
369{
370	struct device_node *np;
371	struct platform_device *pdev;
372
373	np = of_parse_phandle(cpu_dev->of_node, "mediatek,cci", 0);
374	if (!np)
375		return ERR_PTR(-ENODEV);
376
377	pdev = of_find_device_by_node(np);
378	of_node_put(np);
379	if (!pdev)
380		return ERR_PTR(-ENODEV);
381
382	return &pdev->dev;
383}
384
385static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
386{
387	struct device *cpu_dev;
 
 
 
 
388	struct dev_pm_opp *opp;
389	unsigned long rate;
390	int ret;
391
392	cpu_dev = get_cpu_device(cpu);
393	if (!cpu_dev)
394		return dev_err_probe(cpu_dev, -ENODEV, "failed to get cpu%d device\n", cpu);
395	info->cpu_dev = cpu_dev;
396
397	info->ccifreq_bound = false;
398	if (info->soc_data->ccifreq_supported) {
399		info->cci_dev = of_get_cci(info->cpu_dev);
400		if (IS_ERR(info->cci_dev))
401			return dev_err_probe(cpu_dev, PTR_ERR(info->cci_dev),
402					     "cpu%d: failed to get cci device\n",
403					     cpu);
404	}
405
406	info->cpu_clk = clk_get(cpu_dev, "cpu");
407	if (IS_ERR(info->cpu_clk))
408		return dev_err_probe(cpu_dev, PTR_ERR(info->cpu_clk),
409				     "cpu%d: failed to get cpu clk\n", cpu);
410
411	info->inter_clk = clk_get(cpu_dev, "intermediate");
412	if (IS_ERR(info->inter_clk)) {
413		ret = PTR_ERR(info->inter_clk);
414		dev_err_probe(cpu_dev, ret,
415			      "cpu%d: failed to get intermediate clk\n", cpu);
416		goto out_free_mux_clock;
417	}
418
419	info->proc_reg = regulator_get_optional(cpu_dev, "proc");
420	if (IS_ERR(info->proc_reg)) {
421		ret = PTR_ERR(info->proc_reg);
422		dev_err_probe(cpu_dev, ret,
423			      "cpu%d: failed to get proc regulator\n", cpu);
424		goto out_free_inter_clock;
425	}
426
427	ret = regulator_enable(info->proc_reg);
428	if (ret) {
429		dev_err_probe(cpu_dev, ret, "cpu%d: failed to enable vproc\n", cpu);
430		goto out_free_proc_reg;
 
 
 
 
 
431	}
432
433	/* Both presence and absence of sram regulator are valid cases. */
434	info->sram_reg = regulator_get_optional(cpu_dev, "sram");
435	if (IS_ERR(info->sram_reg)) {
436		ret = PTR_ERR(info->sram_reg);
437		if (ret == -EPROBE_DEFER) {
438			dev_err_probe(cpu_dev, ret,
439				      "cpu%d: Failed to get sram regulator\n", cpu);
440			goto out_disable_proc_reg;
441		}
 
 
 
 
 
 
 
 
 
 
 
 
442
443		info->sram_reg = NULL;
444	} else {
445		ret = regulator_enable(info->sram_reg);
446		if (ret) {
447			dev_err_probe(cpu_dev, ret, "cpu%d: failed to enable vsram\n", cpu);
448			goto out_free_sram_reg;
449		}
450	}
451
 
 
 
452	/* Get OPP-sharing information from "operating-points-v2" bindings */
453	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, &info->cpus);
454	if (ret) {
455		dev_err_probe(cpu_dev, ret,
456			"cpu%d: failed to get OPP-sharing information\n", cpu);
457		goto out_disable_sram_reg;
458	}
459
460	ret = dev_pm_opp_of_cpumask_add_table(&info->cpus);
461	if (ret) {
462		dev_err_probe(cpu_dev, ret, "cpu%d: no OPP table\n", cpu);
463		goto out_disable_sram_reg;
464	}
465
466	ret = clk_prepare_enable(info->cpu_clk);
467	if (ret) {
468		dev_err_probe(cpu_dev, ret, "cpu%d: failed to enable cpu clk\n", cpu);
469		goto out_free_opp_table;
470	}
471
472	ret = clk_prepare_enable(info->inter_clk);
473	if (ret) {
474		dev_err_probe(cpu_dev, ret, "cpu%d: failed to enable inter clk\n", cpu);
475		goto out_disable_mux_clock;
476	}
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 = dev_err_probe(info->cpu_dev, info->vproc_on_boot,
482					    "invalid Vproc value\n");
483			goto out_disable_inter_clock;
484		}
485	}
486
487	/* Search a safe voltage for intermediate frequency. */
488	rate = clk_get_rate(info->inter_clk);
489	opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
490	if (IS_ERR(opp)) {
491		ret = dev_err_probe(cpu_dev, PTR_ERR(opp),
492				    "cpu%d: failed to get intermediate opp\n", cpu);
493		goto out_disable_inter_clock;
494	}
495	info->intermediate_voltage = dev_pm_opp_get_voltage(opp);
496	dev_pm_opp_put(opp);
497
498	mutex_init(&info->reg_lock);
499	info->current_freq = clk_get_rate(info->cpu_clk);
500
501	info->opp_cpu = cpu;
502	info->opp_nb.notifier_call = mtk_cpufreq_opp_notifier;
503	ret = dev_pm_opp_register_notifier(cpu_dev, &info->opp_nb);
504	if (ret) {
505		dev_err_probe(cpu_dev, ret, "cpu%d: failed to register opp notifier\n", cpu);
506		goto out_disable_inter_clock;
507	}
508
509	/*
510	 * If SRAM regulator is present, software "voltage tracking" is needed
511	 * for this CPU power domain.
512	 */
513	info->need_voltage_tracking = (info->sram_reg != NULL);
514
515	/*
516	 * We assume min voltage is 0 and tracking target voltage using
517	 * min_volt_shift for each iteration.
518	 * The vtrack_max is 3 times of expeted iteration count.
519	 */
520	info->vtrack_max = 3 * DIV_ROUND_UP(max(info->soc_data->sram_max_volt,
521						info->soc_data->proc_max_volt),
522					    info->soc_data->min_volt_shift);
523
524	return 0;
525
526out_disable_inter_clock:
527	clk_disable_unprepare(info->inter_clk);
528
529out_disable_mux_clock:
530	clk_disable_unprepare(info->cpu_clk);
531
532out_free_opp_table:
533	dev_pm_opp_of_cpumask_remove_table(&info->cpus);
534
535out_disable_sram_reg:
536	if (info->sram_reg)
537		regulator_disable(info->sram_reg);
538
539out_free_sram_reg:
540	if (info->sram_reg)
541		regulator_put(info->sram_reg);
542
543out_disable_proc_reg:
544	regulator_disable(info->proc_reg);
545
546out_free_proc_reg:
547	regulator_put(info->proc_reg);
548
549out_free_inter_clock:
550	clk_put(info->inter_clk);
551
552out_free_mux_clock:
553	clk_put(info->cpu_clk);
554
555	return ret;
556}
557
558static void mtk_cpu_dvfs_info_release(struct mtk_cpu_dvfs_info *info)
559{
560	regulator_disable(info->proc_reg);
561	regulator_put(info->proc_reg);
562	if (info->sram_reg) {
563		regulator_disable(info->sram_reg);
564		regulator_put(info->sram_reg);
565	}
566	clk_disable_unprepare(info->cpu_clk);
567	clk_put(info->cpu_clk);
568	clk_disable_unprepare(info->inter_clk);
569	clk_put(info->inter_clk);
570	dev_pm_opp_of_cpumask_remove_table(&info->cpus);
571	dev_pm_opp_unregister_notifier(info->cpu_dev, &info->opp_nb);
572}
573
574static int mtk_cpufreq_init(struct cpufreq_policy *policy)
575{
576	struct mtk_cpu_dvfs_info *info;
577	struct cpufreq_frequency_table *freq_table;
578	int ret;
579
580	info = mtk_cpu_dvfs_info_lookup(policy->cpu);
581	if (!info) {
582		pr_err("dvfs info for cpu%d is not initialized.\n",
583			policy->cpu);
584		return -EINVAL;
585	}
586
587	ret = dev_pm_opp_init_cpufreq_table(info->cpu_dev, &freq_table);
588	if (ret) {
589		dev_err(info->cpu_dev,
590			"failed to init cpufreq table for cpu%d: %d\n",
591			policy->cpu, ret);
592		return ret;
593	}
594
595	cpumask_copy(policy->cpus, &info->cpus);
596	policy->freq_table = freq_table;
597	policy->driver_data = info;
598	policy->clk = info->cpu_clk;
599
 
 
600	return 0;
601}
602
603static void mtk_cpufreq_exit(struct cpufreq_policy *policy)
604{
605	struct mtk_cpu_dvfs_info *info = policy->driver_data;
606
607	dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table);
 
 
608}
609
610static struct cpufreq_driver mtk_cpufreq_driver = {
611	.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
612		 CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
613		 CPUFREQ_IS_COOLING_DEV,
614	.verify = cpufreq_generic_frequency_table_verify,
615	.target_index = mtk_cpufreq_set_target,
616	.get = cpufreq_generic_get,
617	.init = mtk_cpufreq_init,
618	.exit = mtk_cpufreq_exit,
619	.register_em = cpufreq_register_em_with_opp,
620	.name = "mtk-cpufreq",
621	.attr = cpufreq_generic_attr,
622};
623
624static int mtk_cpufreq_probe(struct platform_device *pdev)
625{
626	const struct mtk_cpufreq_platform_data *data;
627	struct mtk_cpu_dvfs_info *info, *tmp;
628	int cpu, ret;
629
630	data = dev_get_platdata(&pdev->dev);
631	if (!data)
632		return dev_err_probe(&pdev->dev, -ENODEV,
633				     "failed to get mtk cpufreq platform data\n");
634
635	for_each_possible_cpu(cpu) {
636		info = mtk_cpu_dvfs_info_lookup(cpu);
637		if (info)
638			continue;
639
640		info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
641		if (!info) {
642			ret = dev_err_probe(&pdev->dev, -ENOMEM,
643					    "Failed to allocate dvfs_info\n");
644			goto release_dvfs_info_list;
645		}
646
647		info->soc_data = data;
648		ret = mtk_cpu_dvfs_info_init(info, cpu);
649		if (ret)
 
 
 
650			goto release_dvfs_info_list;
 
651
652		list_add(&info->list_head, &dvfs_info_list);
653	}
654
655	ret = cpufreq_register_driver(&mtk_cpufreq_driver);
656	if (ret) {
657		dev_err_probe(&pdev->dev, ret, "failed to register mtk cpufreq driver\n");
658		goto release_dvfs_info_list;
659	}
660
661	return 0;
662
663release_dvfs_info_list:
664	list_for_each_entry_safe(info, tmp, &dvfs_info_list, list_head) {
665		mtk_cpu_dvfs_info_release(info);
666		list_del(&info->list_head);
667	}
668
669	return ret;
670}
671
672static struct platform_driver mtk_cpufreq_platdrv = {
673	.driver = {
674		.name	= "mtk-cpufreq",
675	},
676	.probe		= mtk_cpufreq_probe,
677};
678
679static const struct mtk_cpufreq_platform_data mt2701_platform_data = {
680	.min_volt_shift = 100000,
681	.max_volt_shift = 200000,
682	.proc_max_volt = 1150000,
683	.sram_min_volt = 0,
684	.sram_max_volt = 1150000,
685	.ccifreq_supported = false,
686};
687
688static const struct mtk_cpufreq_platform_data mt7622_platform_data = {
689	.min_volt_shift = 100000,
690	.max_volt_shift = 200000,
691	.proc_max_volt = 1350000,
692	.sram_min_volt = 0,
693	.sram_max_volt = 1350000,
694	.ccifreq_supported = false,
695};
696
697static const struct mtk_cpufreq_platform_data mt7623_platform_data = {
698	.min_volt_shift = 100000,
699	.max_volt_shift = 200000,
700	.proc_max_volt = 1300000,
701	.ccifreq_supported = false,
702};
703
704static const struct mtk_cpufreq_platform_data mt7988_platform_data = {
705	.min_volt_shift = 100000,
706	.max_volt_shift = 200000,
707	.proc_max_volt = 900000,
708	.sram_min_volt = 0,
709	.sram_max_volt = 1150000,
710	.ccifreq_supported = true,
711};
712
713static const struct mtk_cpufreq_platform_data mt8183_platform_data = {
714	.min_volt_shift = 100000,
715	.max_volt_shift = 200000,
716	.proc_max_volt = 1150000,
717	.sram_min_volt = 0,
718	.sram_max_volt = 1150000,
719	.ccifreq_supported = true,
720};
721
722static const struct mtk_cpufreq_platform_data mt8186_platform_data = {
723	.min_volt_shift = 100000,
724	.max_volt_shift = 250000,
725	.proc_max_volt = 1118750,
726	.sram_min_volt = 850000,
727	.sram_max_volt = 1118750,
728	.ccifreq_supported = true,
729};
730
731static const struct mtk_cpufreq_platform_data mt8516_platform_data = {
732	.min_volt_shift = 100000,
733	.max_volt_shift = 200000,
734	.proc_max_volt = 1310000,
735	.sram_min_volt = 0,
736	.sram_max_volt = 1310000,
737	.ccifreq_supported = false,
738};
739
740/* List of machines supported by this driver */
741static const struct of_device_id mtk_cpufreq_machines[] __initconst __maybe_unused = {
742	{ .compatible = "mediatek,mt2701", .data = &mt2701_platform_data },
743	{ .compatible = "mediatek,mt2712", .data = &mt2701_platform_data },
744	{ .compatible = "mediatek,mt7622", .data = &mt7622_platform_data },
745	{ .compatible = "mediatek,mt7623", .data = &mt7623_platform_data },
746	{ .compatible = "mediatek,mt7988a", .data = &mt7988_platform_data },
747	{ .compatible = "mediatek,mt8167", .data = &mt8516_platform_data },
748	{ .compatible = "mediatek,mt817x", .data = &mt2701_platform_data },
749	{ .compatible = "mediatek,mt8173", .data = &mt2701_platform_data },
750	{ .compatible = "mediatek,mt8176", .data = &mt2701_platform_data },
751	{ .compatible = "mediatek,mt8183", .data = &mt8183_platform_data },
752	{ .compatible = "mediatek,mt8186", .data = &mt8186_platform_data },
753	{ .compatible = "mediatek,mt8365", .data = &mt2701_platform_data },
754	{ .compatible = "mediatek,mt8516", .data = &mt8516_platform_data },
755	{ }
756};
757MODULE_DEVICE_TABLE(of, mtk_cpufreq_machines);
758
759static int __init mtk_cpufreq_driver_init(void)
760{
761	struct device_node *np;
762	const struct of_device_id *match;
763	const struct mtk_cpufreq_platform_data *data;
764	int err;
765
766	np = of_find_node_by_path("/");
767	if (!np)
768		return -ENODEV;
769
770	match = of_match_node(mtk_cpufreq_machines, np);
771	of_node_put(np);
772	if (!match) {
773		pr_debug("Machine is not compatible with mtk-cpufreq\n");
774		return -ENODEV;
775	}
776	data = match->data;
777
778	err = platform_driver_register(&mtk_cpufreq_platdrv);
779	if (err)
780		return err;
781
782	/*
783	 * Since there's no place to hold device registration code and no
784	 * device tree based way to match cpufreq driver yet, both the driver
785	 * and the device registration codes are put here to handle defer
786	 * probing.
787	 */
788	cpufreq_pdev = platform_device_register_data(NULL, "mtk-cpufreq", -1,
789						     data, sizeof(*data));
790	if (IS_ERR(cpufreq_pdev)) {
791		pr_err("failed to register mtk-cpufreq platform device\n");
792		platform_driver_unregister(&mtk_cpufreq_platdrv);
793		return PTR_ERR(cpufreq_pdev);
794	}
795
796	return 0;
797}
798module_init(mtk_cpufreq_driver_init)
799
800static void __exit mtk_cpufreq_driver_exit(void)
801{
802	platform_device_unregister(cpufreq_pdev);
803	platform_driver_unregister(&mtk_cpufreq_platdrv);
804}
805module_exit(mtk_cpufreq_driver_exit)
806
807MODULE_DESCRIPTION("MediaTek CPUFreq driver");
808MODULE_AUTHOR("Pi-Cheng Chen <pi-cheng.chen@linaro.org>");
809MODULE_LICENSE("GPL v2");