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1453863f PCC |
1 | /* |
2 | * Copyright (c) 2015 Linaro Ltd. | |
3 | * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/clk.h> | |
16 | #include <linux/cpu.h> | |
17 | #include <linux/cpu_cooling.h> | |
18 | #include <linux/cpufreq.h> | |
19 | #include <linux/cpumask.h> | |
3c2002ae | 20 | #include <linux/module.h> |
1453863f PCC |
21 | #include <linux/of.h> |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/pm_opp.h> | |
24 | #include <linux/regulator/consumer.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/thermal.h> | |
27 | ||
28 | #define MIN_VOLT_SHIFT (100000) | |
29 | #define MAX_VOLT_SHIFT (200000) | |
30 | #define MAX_VOLT_LIMIT (1150000) | |
31 | #define VOLT_TOL (10000) | |
32 | ||
33 | /* | |
34 | * The struct mtk_cpu_dvfs_info holds necessary information for doing CPU DVFS | |
35 | * on each CPU power/clock domain of Mediatek SoCs. Each CPU cluster in | |
36 | * Mediatek SoCs has two voltage inputs, Vproc and Vsram. In some cases the two | |
37 | * voltage inputs need to be controlled under a hardware limitation: | |
38 | * 100mV < Vsram - Vproc < 200mV | |
39 | * | |
40 | * When scaling the clock frequency of a CPU clock domain, the clock source | |
41 | * needs to be switched to another stable PLL clock temporarily until | |
42 | * the original PLL becomes stable at target frequency. | |
43 | */ | |
44 | struct mtk_cpu_dvfs_info { | |
89b56047 | 45 | struct cpumask cpus; |
1453863f PCC |
46 | struct device *cpu_dev; |
47 | struct regulator *proc_reg; | |
48 | struct regulator *sram_reg; | |
49 | struct clk *cpu_clk; | |
50 | struct clk *inter_clk; | |
51 | struct thermal_cooling_device *cdev; | |
89b56047 | 52 | struct list_head list_head; |
1453863f PCC |
53 | int intermediate_voltage; |
54 | bool need_voltage_tracking; | |
55 | }; | |
56 | ||
89b56047 PCC |
57 | static LIST_HEAD(dvfs_info_list); |
58 | ||
59 | static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu) | |
60 | { | |
61 | struct mtk_cpu_dvfs_info *info; | |
89b56047 | 62 | |
d2499d05 | 63 | list_for_each_entry(info, &dvfs_info_list, list_head) { |
89b56047 PCC |
64 | if (cpumask_test_cpu(cpu, &info->cpus)) |
65 | return info; | |
66 | } | |
67 | ||
68 | return NULL; | |
69 | } | |
70 | ||
1453863f PCC |
71 | static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info, |
72 | int new_vproc) | |
73 | { | |
74 | struct regulator *proc_reg = info->proc_reg; | |
75 | struct regulator *sram_reg = info->sram_reg; | |
76 | int old_vproc, old_vsram, new_vsram, vsram, vproc, ret; | |
77 | ||
78 | old_vproc = regulator_get_voltage(proc_reg); | |
40be4c3c PCC |
79 | if (old_vproc < 0) { |
80 | pr_err("%s: invalid Vproc value: %d\n", __func__, old_vproc); | |
81 | return old_vproc; | |
82 | } | |
1453863f PCC |
83 | /* Vsram should not exceed the maximum allowed voltage of SoC. */ |
84 | new_vsram = min(new_vproc + MIN_VOLT_SHIFT, MAX_VOLT_LIMIT); | |
85 | ||
86 | if (old_vproc < new_vproc) { | |
87 | /* | |
88 | * When scaling up voltages, Vsram and Vproc scale up step | |
89 | * by step. At each step, set Vsram to (Vproc + 200mV) first, | |
90 | * then set Vproc to (Vsram - 100mV). | |
91 | * Keep doing it until Vsram and Vproc hit target voltages. | |
92 | */ | |
93 | do { | |
94 | old_vsram = regulator_get_voltage(sram_reg); | |
40be4c3c PCC |
95 | if (old_vsram < 0) { |
96 | pr_err("%s: invalid Vsram value: %d\n", | |
97 | __func__, old_vsram); | |
98 | return old_vsram; | |
99 | } | |
1453863f | 100 | old_vproc = regulator_get_voltage(proc_reg); |
40be4c3c PCC |
101 | if (old_vproc < 0) { |
102 | pr_err("%s: invalid Vproc value: %d\n", | |
103 | __func__, old_vproc); | |
104 | return old_vproc; | |
105 | } | |
1453863f PCC |
106 | |
107 | vsram = min(new_vsram, old_vproc + MAX_VOLT_SHIFT); | |
108 | ||
109 | if (vsram + VOLT_TOL >= MAX_VOLT_LIMIT) { | |
110 | vsram = MAX_VOLT_LIMIT; | |
111 | ||
112 | /* | |
113 | * If the target Vsram hits the maximum voltage, | |
114 | * try to set the exact voltage value first. | |
115 | */ | |
116 | ret = regulator_set_voltage(sram_reg, vsram, | |
117 | vsram); | |
118 | if (ret) | |
119 | ret = regulator_set_voltage(sram_reg, | |
120 | vsram - VOLT_TOL, | |
121 | vsram); | |
122 | ||
123 | vproc = new_vproc; | |
124 | } else { | |
125 | ret = regulator_set_voltage(sram_reg, vsram, | |
126 | vsram + VOLT_TOL); | |
127 | ||
128 | vproc = vsram - MIN_VOLT_SHIFT; | |
129 | } | |
130 | if (ret) | |
131 | return ret; | |
132 | ||
133 | ret = regulator_set_voltage(proc_reg, vproc, | |
134 | vproc + VOLT_TOL); | |
135 | if (ret) { | |
136 | regulator_set_voltage(sram_reg, old_vsram, | |
137 | old_vsram); | |
138 | return ret; | |
139 | } | |
140 | } while (vproc < new_vproc || vsram < new_vsram); | |
141 | } else if (old_vproc > new_vproc) { | |
142 | /* | |
143 | * When scaling down voltages, Vsram and Vproc scale down step | |
144 | * by step. At each step, set Vproc to (Vsram - 200mV) first, | |
145 | * then set Vproc to (Vproc + 100mV). | |
146 | * Keep doing it until Vsram and Vproc hit target voltages. | |
147 | */ | |
148 | do { | |
149 | old_vproc = regulator_get_voltage(proc_reg); | |
40be4c3c PCC |
150 | if (old_vproc < 0) { |
151 | pr_err("%s: invalid Vproc value: %d\n", | |
152 | __func__, old_vproc); | |
153 | return old_vproc; | |
154 | } | |
1453863f | 155 | old_vsram = regulator_get_voltage(sram_reg); |
40be4c3c PCC |
156 | if (old_vsram < 0) { |
157 | pr_err("%s: invalid Vsram value: %d\n", | |
158 | __func__, old_vsram); | |
159 | return old_vsram; | |
160 | } | |
1453863f PCC |
161 | |
162 | vproc = max(new_vproc, old_vsram - MAX_VOLT_SHIFT); | |
163 | ret = regulator_set_voltage(proc_reg, vproc, | |
164 | vproc + VOLT_TOL); | |
165 | if (ret) | |
166 | return ret; | |
167 | ||
168 | if (vproc == new_vproc) | |
169 | vsram = new_vsram; | |
170 | else | |
171 | vsram = max(new_vsram, vproc + MIN_VOLT_SHIFT); | |
172 | ||
173 | if (vsram + VOLT_TOL >= MAX_VOLT_LIMIT) { | |
174 | vsram = MAX_VOLT_LIMIT; | |
175 | ||
176 | /* | |
177 | * If the target Vsram hits the maximum voltage, | |
178 | * try to set the exact voltage value first. | |
179 | */ | |
180 | ret = regulator_set_voltage(sram_reg, vsram, | |
181 | vsram); | |
182 | if (ret) | |
183 | ret = regulator_set_voltage(sram_reg, | |
184 | vsram - VOLT_TOL, | |
185 | vsram); | |
186 | } else { | |
187 | ret = regulator_set_voltage(sram_reg, vsram, | |
188 | vsram + VOLT_TOL); | |
189 | } | |
190 | ||
191 | if (ret) { | |
192 | regulator_set_voltage(proc_reg, old_vproc, | |
193 | old_vproc); | |
194 | return ret; | |
195 | } | |
196 | } while (vproc > new_vproc + VOLT_TOL || | |
197 | vsram > new_vsram + VOLT_TOL); | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static int mtk_cpufreq_set_voltage(struct mtk_cpu_dvfs_info *info, int vproc) | |
204 | { | |
205 | if (info->need_voltage_tracking) | |
206 | return mtk_cpufreq_voltage_tracking(info, vproc); | |
207 | else | |
208 | return regulator_set_voltage(info->proc_reg, vproc, | |
209 | vproc + VOLT_TOL); | |
210 | } | |
211 | ||
212 | static int mtk_cpufreq_set_target(struct cpufreq_policy *policy, | |
213 | unsigned int index) | |
214 | { | |
215 | struct cpufreq_frequency_table *freq_table = policy->freq_table; | |
216 | struct clk *cpu_clk = policy->clk; | |
217 | struct clk *armpll = clk_get_parent(cpu_clk); | |
218 | struct mtk_cpu_dvfs_info *info = policy->driver_data; | |
219 | struct device *cpu_dev = info->cpu_dev; | |
220 | struct dev_pm_opp *opp; | |
221 | long freq_hz, old_freq_hz; | |
222 | int vproc, old_vproc, inter_vproc, target_vproc, ret; | |
223 | ||
224 | inter_vproc = info->intermediate_voltage; | |
225 | ||
226 | old_freq_hz = clk_get_rate(cpu_clk); | |
227 | old_vproc = regulator_get_voltage(info->proc_reg); | |
40be4c3c PCC |
228 | if (old_vproc < 0) { |
229 | pr_err("%s: invalid Vproc value: %d\n", __func__, old_vproc); | |
230 | return old_vproc; | |
231 | } | |
1453863f PCC |
232 | |
233 | freq_hz = freq_table[index].frequency * 1000; | |
234 | ||
235 | rcu_read_lock(); | |
236 | opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz); | |
237 | if (IS_ERR(opp)) { | |
238 | rcu_read_unlock(); | |
239 | pr_err("cpu%d: failed to find OPP for %ld\n", | |
240 | policy->cpu, freq_hz); | |
241 | return PTR_ERR(opp); | |
242 | } | |
243 | vproc = dev_pm_opp_get_voltage(opp); | |
244 | rcu_read_unlock(); | |
245 | ||
246 | /* | |
247 | * If the new voltage or the intermediate voltage is higher than the | |
248 | * current voltage, scale up voltage first. | |
249 | */ | |
250 | target_vproc = (inter_vproc > vproc) ? inter_vproc : vproc; | |
251 | if (old_vproc < target_vproc) { | |
252 | ret = mtk_cpufreq_set_voltage(info, target_vproc); | |
253 | if (ret) { | |
254 | pr_err("cpu%d: failed to scale up voltage!\n", | |
255 | policy->cpu); | |
256 | mtk_cpufreq_set_voltage(info, old_vproc); | |
257 | return ret; | |
258 | } | |
259 | } | |
260 | ||
261 | /* Reparent the CPU clock to intermediate clock. */ | |
262 | ret = clk_set_parent(cpu_clk, info->inter_clk); | |
263 | if (ret) { | |
264 | pr_err("cpu%d: failed to re-parent cpu clock!\n", | |
265 | policy->cpu); | |
266 | mtk_cpufreq_set_voltage(info, old_vproc); | |
267 | WARN_ON(1); | |
268 | return ret; | |
269 | } | |
270 | ||
271 | /* Set the original PLL to target rate. */ | |
272 | ret = clk_set_rate(armpll, freq_hz); | |
273 | if (ret) { | |
274 | pr_err("cpu%d: failed to scale cpu clock rate!\n", | |
275 | policy->cpu); | |
276 | clk_set_parent(cpu_clk, armpll); | |
277 | mtk_cpufreq_set_voltage(info, old_vproc); | |
278 | return ret; | |
279 | } | |
280 | ||
281 | /* Set parent of CPU clock back to the original PLL. */ | |
282 | ret = clk_set_parent(cpu_clk, armpll); | |
283 | if (ret) { | |
284 | pr_err("cpu%d: failed to re-parent cpu clock!\n", | |
285 | policy->cpu); | |
286 | mtk_cpufreq_set_voltage(info, inter_vproc); | |
287 | WARN_ON(1); | |
288 | return ret; | |
289 | } | |
290 | ||
291 | /* | |
292 | * If the new voltage is lower than the intermediate voltage or the | |
293 | * original voltage, scale down to the new voltage. | |
294 | */ | |
295 | if (vproc < inter_vproc || vproc < old_vproc) { | |
296 | ret = mtk_cpufreq_set_voltage(info, vproc); | |
297 | if (ret) { | |
298 | pr_err("cpu%d: failed to scale down voltage!\n", | |
299 | policy->cpu); | |
300 | clk_set_parent(cpu_clk, info->inter_clk); | |
301 | clk_set_rate(armpll, old_freq_hz); | |
302 | clk_set_parent(cpu_clk, armpll); | |
303 | return ret; | |
304 | } | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
d2901603 DC |
310 | #define DYNAMIC_POWER "dynamic-power-coefficient" |
311 | ||
1453863f PCC |
312 | static void mtk_cpufreq_ready(struct cpufreq_policy *policy) |
313 | { | |
314 | struct mtk_cpu_dvfs_info *info = policy->driver_data; | |
315 | struct device_node *np = of_node_get(info->cpu_dev->of_node); | |
d2901603 | 316 | u32 capacitance = 0; |
1453863f PCC |
317 | |
318 | if (WARN_ON(!np)) | |
319 | return; | |
320 | ||
321 | if (of_find_property(np, "#cooling-cells", NULL)) { | |
d2901603 DC |
322 | of_property_read_u32(np, DYNAMIC_POWER, &capacitance); |
323 | ||
324 | info->cdev = of_cpufreq_power_cooling_register(np, | |
325 | policy->related_cpus, | |
326 | capacitance, | |
327 | NULL); | |
1453863f PCC |
328 | |
329 | if (IS_ERR(info->cdev)) { | |
330 | dev_err(info->cpu_dev, | |
331 | "running cpufreq without cooling device: %ld\n", | |
332 | PTR_ERR(info->cdev)); | |
333 | ||
334 | info->cdev = NULL; | |
335 | } | |
336 | } | |
337 | ||
338 | of_node_put(np); | |
339 | } | |
340 | ||
341 | static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu) | |
342 | { | |
343 | struct device *cpu_dev; | |
344 | struct regulator *proc_reg = ERR_PTR(-ENODEV); | |
345 | struct regulator *sram_reg = ERR_PTR(-ENODEV); | |
346 | struct clk *cpu_clk = ERR_PTR(-ENODEV); | |
347 | struct clk *inter_clk = ERR_PTR(-ENODEV); | |
348 | struct dev_pm_opp *opp; | |
349 | unsigned long rate; | |
350 | int ret; | |
351 | ||
352 | cpu_dev = get_cpu_device(cpu); | |
353 | if (!cpu_dev) { | |
354 | pr_err("failed to get cpu%d device\n", cpu); | |
355 | return -ENODEV; | |
356 | } | |
357 | ||
358 | cpu_clk = clk_get(cpu_dev, "cpu"); | |
359 | if (IS_ERR(cpu_clk)) { | |
360 | if (PTR_ERR(cpu_clk) == -EPROBE_DEFER) | |
361 | pr_warn("cpu clk for cpu%d not ready, retry.\n", cpu); | |
362 | else | |
363 | pr_err("failed to get cpu clk for cpu%d\n", cpu); | |
364 | ||
365 | ret = PTR_ERR(cpu_clk); | |
366 | return ret; | |
367 | } | |
368 | ||
369 | inter_clk = clk_get(cpu_dev, "intermediate"); | |
370 | if (IS_ERR(inter_clk)) { | |
371 | if (PTR_ERR(inter_clk) == -EPROBE_DEFER) | |
372 | pr_warn("intermediate clk for cpu%d not ready, retry.\n", | |
373 | cpu); | |
374 | else | |
375 | pr_err("failed to get intermediate clk for cpu%d\n", | |
376 | cpu); | |
377 | ||
378 | ret = PTR_ERR(inter_clk); | |
379 | goto out_free_resources; | |
380 | } | |
381 | ||
382 | proc_reg = regulator_get_exclusive(cpu_dev, "proc"); | |
383 | if (IS_ERR(proc_reg)) { | |
384 | if (PTR_ERR(proc_reg) == -EPROBE_DEFER) | |
385 | pr_warn("proc regulator for cpu%d not ready, retry.\n", | |
386 | cpu); | |
387 | else | |
388 | pr_err("failed to get proc regulator for cpu%d\n", | |
389 | cpu); | |
390 | ||
391 | ret = PTR_ERR(proc_reg); | |
392 | goto out_free_resources; | |
393 | } | |
394 | ||
395 | /* Both presence and absence of sram regulator are valid cases. */ | |
396 | sram_reg = regulator_get_exclusive(cpu_dev, "sram"); | |
397 | ||
a889331d PCC |
398 | /* Get OPP-sharing information from "operating-points-v2" bindings */ |
399 | ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, &info->cpus); | |
400 | if (ret) { | |
401 | pr_err("failed to get OPP-sharing information for cpu%d\n", | |
402 | cpu); | |
403 | goto out_free_resources; | |
404 | } | |
405 | ||
406 | ret = dev_pm_opp_of_cpumask_add_table(&info->cpus); | |
1453863f PCC |
407 | if (ret) { |
408 | pr_warn("no OPP table for cpu%d\n", cpu); | |
409 | goto out_free_resources; | |
410 | } | |
411 | ||
412 | /* Search a safe voltage for intermediate frequency. */ | |
413 | rate = clk_get_rate(inter_clk); | |
414 | rcu_read_lock(); | |
415 | opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate); | |
416 | if (IS_ERR(opp)) { | |
417 | rcu_read_unlock(); | |
418 | pr_err("failed to get intermediate opp for cpu%d\n", cpu); | |
419 | ret = PTR_ERR(opp); | |
420 | goto out_free_opp_table; | |
421 | } | |
422 | info->intermediate_voltage = dev_pm_opp_get_voltage(opp); | |
423 | rcu_read_unlock(); | |
424 | ||
425 | info->cpu_dev = cpu_dev; | |
426 | info->proc_reg = proc_reg; | |
427 | info->sram_reg = IS_ERR(sram_reg) ? NULL : sram_reg; | |
428 | info->cpu_clk = cpu_clk; | |
429 | info->inter_clk = inter_clk; | |
430 | ||
431 | /* | |
432 | * If SRAM regulator is present, software "voltage tracking" is needed | |
433 | * for this CPU power domain. | |
434 | */ | |
435 | info->need_voltage_tracking = !IS_ERR(sram_reg); | |
436 | ||
437 | return 0; | |
438 | ||
439 | out_free_opp_table: | |
a889331d | 440 | dev_pm_opp_of_cpumask_remove_table(&info->cpus); |
1453863f PCC |
441 | |
442 | out_free_resources: | |
443 | if (!IS_ERR(proc_reg)) | |
444 | regulator_put(proc_reg); | |
445 | if (!IS_ERR(sram_reg)) | |
446 | regulator_put(sram_reg); | |
447 | if (!IS_ERR(cpu_clk)) | |
448 | clk_put(cpu_clk); | |
449 | if (!IS_ERR(inter_clk)) | |
450 | clk_put(inter_clk); | |
451 | ||
452 | return ret; | |
453 | } | |
454 | ||
455 | static void mtk_cpu_dvfs_info_release(struct mtk_cpu_dvfs_info *info) | |
456 | { | |
457 | if (!IS_ERR(info->proc_reg)) | |
458 | regulator_put(info->proc_reg); | |
459 | if (!IS_ERR(info->sram_reg)) | |
460 | regulator_put(info->sram_reg); | |
461 | if (!IS_ERR(info->cpu_clk)) | |
462 | clk_put(info->cpu_clk); | |
463 | if (!IS_ERR(info->inter_clk)) | |
464 | clk_put(info->inter_clk); | |
465 | ||
a889331d | 466 | dev_pm_opp_of_cpumask_remove_table(&info->cpus); |
1453863f PCC |
467 | } |
468 | ||
469 | static int mtk_cpufreq_init(struct cpufreq_policy *policy) | |
470 | { | |
471 | struct mtk_cpu_dvfs_info *info; | |
472 | struct cpufreq_frequency_table *freq_table; | |
473 | int ret; | |
474 | ||
89b56047 PCC |
475 | info = mtk_cpu_dvfs_info_lookup(policy->cpu); |
476 | if (!info) { | |
477 | pr_err("dvfs info for cpu%d is not initialized.\n", | |
478 | policy->cpu); | |
479 | return -EINVAL; | |
1453863f PCC |
480 | } |
481 | ||
482 | ret = dev_pm_opp_init_cpufreq_table(info->cpu_dev, &freq_table); | |
483 | if (ret) { | |
484 | pr_err("failed to init cpufreq table for cpu%d: %d\n", | |
485 | policy->cpu, ret); | |
89b56047 | 486 | return ret; |
1453863f PCC |
487 | } |
488 | ||
489 | ret = cpufreq_table_validate_and_show(policy, freq_table); | |
490 | if (ret) { | |
491 | pr_err("%s: invalid frequency table: %d\n", __func__, ret); | |
492 | goto out_free_cpufreq_table; | |
493 | } | |
494 | ||
89b56047 | 495 | cpumask_copy(policy->cpus, &info->cpus); |
1453863f PCC |
496 | policy->driver_data = info; |
497 | policy->clk = info->cpu_clk; | |
498 | ||
499 | return 0; | |
500 | ||
501 | out_free_cpufreq_table: | |
502 | dev_pm_opp_free_cpufreq_table(info->cpu_dev, &freq_table); | |
1453863f PCC |
503 | return ret; |
504 | } | |
505 | ||
506 | static int mtk_cpufreq_exit(struct cpufreq_policy *policy) | |
507 | { | |
508 | struct mtk_cpu_dvfs_info *info = policy->driver_data; | |
509 | ||
510 | cpufreq_cooling_unregister(info->cdev); | |
511 | dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table); | |
1453863f PCC |
512 | |
513 | return 0; | |
514 | } | |
515 | ||
516 | static struct cpufreq_driver mt8173_cpufreq_driver = { | |
9bb46b87 PCC |
517 | .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK | |
518 | CPUFREQ_HAVE_GOVERNOR_PER_POLICY, | |
1453863f PCC |
519 | .verify = cpufreq_generic_frequency_table_verify, |
520 | .target_index = mtk_cpufreq_set_target, | |
521 | .get = cpufreq_generic_get, | |
522 | .init = mtk_cpufreq_init, | |
523 | .exit = mtk_cpufreq_exit, | |
524 | .ready = mtk_cpufreq_ready, | |
525 | .name = "mtk-cpufreq", | |
526 | .attr = cpufreq_generic_attr, | |
527 | }; | |
528 | ||
529 | static int mt8173_cpufreq_probe(struct platform_device *pdev) | |
530 | { | |
d2499d05 | 531 | struct mtk_cpu_dvfs_info *info, *tmp; |
89b56047 PCC |
532 | int cpu, ret; |
533 | ||
534 | for_each_possible_cpu(cpu) { | |
535 | info = mtk_cpu_dvfs_info_lookup(cpu); | |
536 | if (info) | |
537 | continue; | |
538 | ||
539 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
540 | if (!info) { | |
541 | ret = -ENOMEM; | |
542 | goto release_dvfs_info_list; | |
543 | } | |
544 | ||
545 | ret = mtk_cpu_dvfs_info_init(info, cpu); | |
546 | if (ret) { | |
547 | dev_err(&pdev->dev, | |
548 | "failed to initialize dvfs info for cpu%d\n", | |
549 | cpu); | |
550 | goto release_dvfs_info_list; | |
551 | } | |
552 | ||
553 | list_add(&info->list_head, &dvfs_info_list); | |
554 | } | |
1453863f PCC |
555 | |
556 | ret = cpufreq_register_driver(&mt8173_cpufreq_driver); | |
89b56047 PCC |
557 | if (ret) { |
558 | dev_err(&pdev->dev, "failed to register mtk cpufreq driver\n"); | |
559 | goto release_dvfs_info_list; | |
560 | } | |
561 | ||
562 | return 0; | |
563 | ||
564 | release_dvfs_info_list: | |
d2499d05 | 565 | list_for_each_entry_safe(info, tmp, &dvfs_info_list, list_head) { |
89b56047 | 566 | mtk_cpu_dvfs_info_release(info); |
d2499d05 | 567 | list_del(&info->list_head); |
89b56047 | 568 | } |
1453863f PCC |
569 | |
570 | return ret; | |
571 | } | |
572 | ||
573 | static struct platform_driver mt8173_cpufreq_platdrv = { | |
574 | .driver = { | |
575 | .name = "mt8173-cpufreq", | |
576 | }, | |
577 | .probe = mt8173_cpufreq_probe, | |
578 | }; | |
579 | ||
580 | static int mt8173_cpufreq_driver_init(void) | |
581 | { | |
582 | struct platform_device *pdev; | |
583 | int err; | |
584 | ||
585 | if (!of_machine_is_compatible("mediatek,mt8173")) | |
586 | return -ENODEV; | |
587 | ||
588 | err = platform_driver_register(&mt8173_cpufreq_platdrv); | |
589 | if (err) | |
590 | return err; | |
591 | ||
592 | /* | |
593 | * Since there's no place to hold device registration code and no | |
594 | * device tree based way to match cpufreq driver yet, both the driver | |
595 | * and the device registration codes are put here to handle defer | |
596 | * probing. | |
597 | */ | |
598 | pdev = platform_device_register_simple("mt8173-cpufreq", -1, NULL, 0); | |
599 | if (IS_ERR(pdev)) { | |
600 | pr_err("failed to register mtk-cpufreq platform device\n"); | |
601 | return PTR_ERR(pdev); | |
602 | } | |
603 | ||
604 | return 0; | |
605 | } | |
606 | device_initcall(mt8173_cpufreq_driver_init); |