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f47b72a1 VK |
1 | /* |
2 | * Generic OPP OF helpers | |
3 | * | |
4 | * Copyright (C) 2009-2010 Texas Instruments Incorporated. | |
5 | * Nishanth Menon | |
6 | * Romit Dasgupta | |
7 | * Kevin Hilman | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
16 | #include <linux/cpu.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/of.h> | |
dfbe4678 | 20 | #include <linux/slab.h> |
f47b72a1 VK |
21 | #include <linux/export.h> |
22 | ||
23 | #include "opp.h" | |
24 | ||
25 | static struct opp_table *_managed_opp(const struct device_node *np) | |
26 | { | |
27 | struct opp_table *opp_table; | |
28 | ||
29 | list_for_each_entry_rcu(opp_table, &opp_tables, node) { | |
30 | if (opp_table->np == np) { | |
31 | /* | |
32 | * Multiple devices can point to the same OPP table and | |
33 | * so will have same node-pointer, np. | |
34 | * | |
35 | * But the OPPs will be considered as shared only if the | |
36 | * OPP table contains a "opp-shared" property. | |
37 | */ | |
79ee2e8f VK |
38 | if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) |
39 | return opp_table; | |
40 | ||
41 | return NULL; | |
f47b72a1 VK |
42 | } |
43 | } | |
44 | ||
45 | return NULL; | |
46 | } | |
47 | ||
48 | void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) | |
49 | { | |
50 | struct device_node *np; | |
51 | ||
52 | /* | |
53 | * Only required for backward compatibility with v1 bindings, but isn't | |
54 | * harmful for other cases. And so we do it unconditionally. | |
55 | */ | |
56 | np = of_node_get(dev->of_node); | |
57 | if (np) { | |
58 | u32 val; | |
59 | ||
60 | if (!of_property_read_u32(np, "clock-latency", &val)) | |
61 | opp_table->clock_latency_ns_max = val; | |
62 | of_property_read_u32(np, "voltage-tolerance", | |
63 | &opp_table->voltage_tolerance_v1); | |
64 | of_node_put(np); | |
65 | } | |
66 | } | |
67 | ||
68 | static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, | |
69 | struct device_node *np) | |
70 | { | |
71 | unsigned int count = opp_table->supported_hw_count; | |
72 | u32 version; | |
73 | int ret; | |
74 | ||
a4ee4545 DG |
75 | if (!opp_table->supported_hw) { |
76 | /* | |
77 | * In the case that no supported_hw has been set by the | |
78 | * platform but there is an opp-supported-hw value set for | |
79 | * an OPP then the OPP should not be enabled as there is | |
80 | * no way to see if the hardware supports it. | |
81 | */ | |
82 | if (of_find_property(np, "opp-supported-hw", NULL)) | |
83 | return false; | |
84 | else | |
85 | return true; | |
86 | } | |
f47b72a1 VK |
87 | |
88 | while (count--) { | |
89 | ret = of_property_read_u32_index(np, "opp-supported-hw", count, | |
90 | &version); | |
91 | if (ret) { | |
92 | dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", | |
93 | __func__, count, ret); | |
94 | return false; | |
95 | } | |
96 | ||
97 | /* Both of these are bitwise masks of the versions */ | |
98 | if (!(version & opp_table->supported_hw[count])) | |
99 | return false; | |
100 | } | |
101 | ||
102 | return true; | |
103 | } | |
104 | ||
f47b72a1 VK |
105 | static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, |
106 | struct opp_table *opp_table) | |
107 | { | |
dfbe4678 VK |
108 | u32 *microvolt, *microamp = NULL; |
109 | int supplies, vcount, icount, ret, i, j; | |
f47b72a1 VK |
110 | struct property *prop = NULL; |
111 | char name[NAME_MAX]; | |
112 | ||
dfbe4678 VK |
113 | supplies = opp_table->regulator_count ? opp_table->regulator_count : 1; |
114 | ||
f47b72a1 VK |
115 | /* Search for "opp-microvolt-<name>" */ |
116 | if (opp_table->prop_name) { | |
117 | snprintf(name, sizeof(name), "opp-microvolt-%s", | |
118 | opp_table->prop_name); | |
119 | prop = of_find_property(opp->np, name, NULL); | |
120 | } | |
121 | ||
122 | if (!prop) { | |
123 | /* Search for "opp-microvolt" */ | |
124 | sprintf(name, "opp-microvolt"); | |
125 | prop = of_find_property(opp->np, name, NULL); | |
126 | ||
127 | /* Missing property isn't a problem, but an invalid entry is */ | |
128 | if (!prop) | |
129 | return 0; | |
130 | } | |
131 | ||
dfbe4678 VK |
132 | vcount = of_property_count_u32_elems(opp->np, name); |
133 | if (vcount < 0) { | |
f47b72a1 | 134 | dev_err(dev, "%s: Invalid %s property (%d)\n", |
dfbe4678 VK |
135 | __func__, name, vcount); |
136 | return vcount; | |
f47b72a1 VK |
137 | } |
138 | ||
dfbe4678 VK |
139 | /* There can be one or three elements per supply */ |
140 | if (vcount != supplies && vcount != supplies * 3) { | |
141 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
142 | __func__, name, vcount, supplies); | |
f47b72a1 VK |
143 | return -EINVAL; |
144 | } | |
145 | ||
dfbe4678 VK |
146 | microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); |
147 | if (!microvolt) | |
148 | return -ENOMEM; | |
149 | ||
150 | ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); | |
f47b72a1 VK |
151 | if (ret) { |
152 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); | |
dfbe4678 VK |
153 | ret = -EINVAL; |
154 | goto free_microvolt; | |
f47b72a1 VK |
155 | } |
156 | ||
157 | /* Search for "opp-microamp-<name>" */ | |
158 | prop = NULL; | |
159 | if (opp_table->prop_name) { | |
160 | snprintf(name, sizeof(name), "opp-microamp-%s", | |
161 | opp_table->prop_name); | |
162 | prop = of_find_property(opp->np, name, NULL); | |
163 | } | |
164 | ||
165 | if (!prop) { | |
166 | /* Search for "opp-microamp" */ | |
167 | sprintf(name, "opp-microamp"); | |
168 | prop = of_find_property(opp->np, name, NULL); | |
169 | } | |
170 | ||
dfbe4678 VK |
171 | if (prop) { |
172 | icount = of_property_count_u32_elems(opp->np, name); | |
173 | if (icount < 0) { | |
174 | dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, | |
175 | name, icount); | |
176 | ret = icount; | |
177 | goto free_microvolt; | |
178 | } | |
f47b72a1 | 179 | |
dfbe4678 VK |
180 | if (icount != supplies) { |
181 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
182 | __func__, name, icount, supplies); | |
183 | ret = -EINVAL; | |
184 | goto free_microvolt; | |
185 | } | |
186 | ||
187 | microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); | |
188 | if (!microamp) { | |
189 | ret = -EINVAL; | |
190 | goto free_microvolt; | |
191 | } | |
192 | ||
193 | ret = of_property_read_u32_array(opp->np, name, microamp, | |
194 | icount); | |
195 | if (ret) { | |
196 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, | |
197 | name, ret); | |
198 | ret = -EINVAL; | |
199 | goto free_microamp; | |
200 | } | |
201 | } | |
202 | ||
203 | for (i = 0, j = 0; i < supplies; i++) { | |
204 | opp->supplies[i].u_volt = microvolt[j++]; | |
205 | ||
206 | if (vcount == supplies) { | |
207 | opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; | |
208 | opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; | |
209 | } else { | |
210 | opp->supplies[i].u_volt_min = microvolt[j++]; | |
211 | opp->supplies[i].u_volt_max = microvolt[j++]; | |
212 | } | |
213 | ||
214 | if (microamp) | |
215 | opp->supplies[i].u_amp = microamp[i]; | |
216 | } | |
217 | ||
218 | free_microamp: | |
219 | kfree(microamp); | |
220 | free_microvolt: | |
221 | kfree(microvolt); | |
222 | ||
223 | return ret; | |
f47b72a1 VK |
224 | } |
225 | ||
226 | /** | |
227 | * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT | |
228 | * entries | |
229 | * @dev: device pointer used to lookup OPP table. | |
230 | * | |
231 | * Free OPPs created using static entries present in DT. | |
232 | * | |
233 | * Locking: The internal opp_table and opp structures are RCU protected. | |
234 | * Hence this function indirectly uses RCU updater strategy with mutex locks | |
235 | * to keep the integrity of the internal data structures. Callers should ensure | |
236 | * that this function is *NOT* called under RCU protection or in contexts where | |
237 | * mutex cannot be locked. | |
238 | */ | |
239 | void dev_pm_opp_of_remove_table(struct device *dev) | |
240 | { | |
9274c892 | 241 | _dev_pm_opp_find_and_remove_table(dev, false); |
f47b72a1 VK |
242 | } |
243 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); | |
244 | ||
245 | /* Returns opp descriptor node for a device, caller must do of_node_put() */ | |
4bee77dc | 246 | static struct device_node *_of_get_opp_desc_node(struct device *dev) |
f47b72a1 VK |
247 | { |
248 | /* | |
f47b72a1 VK |
249 | * There should be only ONE phandle present in "operating-points-v2" |
250 | * property. | |
251 | */ | |
252 | ||
253 | return of_parse_phandle(dev->of_node, "operating-points-v2", 0); | |
254 | } | |
255 | ||
256 | /** | |
257 | * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) | |
8cd2f6e8 | 258 | * @opp_table: OPP table |
f47b72a1 VK |
259 | * @dev: device for which we do this operation |
260 | * @np: device node | |
261 | * | |
262 | * This function adds an opp definition to the opp table and returns status. The | |
263 | * opp can be controlled using dev_pm_opp_enable/disable functions and may be | |
264 | * removed by dev_pm_opp_remove. | |
265 | * | |
266 | * Locking: The internal opp_table and opp structures are RCU protected. | |
267 | * Hence this function internally uses RCU updater strategy with mutex locks | |
268 | * to keep the integrity of the internal data structures. Callers should ensure | |
269 | * that this function is *NOT* called under RCU protection or in contexts where | |
270 | * mutex cannot be locked. | |
271 | * | |
272 | * Return: | |
273 | * 0 On success OR | |
274 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
275 | * -EEXIST Freq are same and volt are different OR | |
276 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
277 | * -ENOMEM Memory allocation failure | |
278 | * -EINVAL Failed parsing the OPP node | |
279 | */ | |
8cd2f6e8 VK |
280 | static int _opp_add_static_v2(struct opp_table *opp_table, struct device *dev, |
281 | struct device_node *np) | |
f47b72a1 | 282 | { |
f47b72a1 VK |
283 | struct dev_pm_opp *new_opp; |
284 | u64 rate; | |
285 | u32 val; | |
286 | int ret; | |
287 | ||
8cd2f6e8 VK |
288 | new_opp = _opp_allocate(opp_table); |
289 | if (!new_opp) | |
290 | return -ENOMEM; | |
f47b72a1 VK |
291 | |
292 | ret = of_property_read_u64(np, "opp-hz", &rate); | |
293 | if (ret < 0) { | |
294 | dev_err(dev, "%s: opp-hz not found\n", __func__); | |
295 | goto free_opp; | |
296 | } | |
297 | ||
298 | /* Check if the OPP supports hardware's hierarchy of versions or not */ | |
299 | if (!_opp_is_supported(dev, opp_table, np)) { | |
300 | dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); | |
301 | goto free_opp; | |
302 | } | |
303 | ||
304 | /* | |
305 | * Rate is defined as an unsigned long in clk API, and so casting | |
306 | * explicitly to its type. Must be fixed once rate is 64 bit | |
307 | * guaranteed in clk API. | |
308 | */ | |
309 | new_opp->rate = (unsigned long)rate; | |
310 | new_opp->turbo = of_property_read_bool(np, "turbo-mode"); | |
311 | ||
312 | new_opp->np = np; | |
313 | new_opp->dynamic = false; | |
314 | new_opp->available = true; | |
315 | ||
316 | if (!of_property_read_u32(np, "clock-latency-ns", &val)) | |
317 | new_opp->clock_latency_ns = val; | |
318 | ||
319 | ret = opp_parse_supplies(new_opp, dev, opp_table); | |
320 | if (ret) | |
321 | goto free_opp; | |
322 | ||
323 | ret = _opp_add(dev, new_opp, opp_table); | |
7f8538eb VK |
324 | if (ret) { |
325 | /* Don't return error for duplicate OPPs */ | |
326 | if (ret == -EBUSY) | |
327 | ret = 0; | |
f47b72a1 | 328 | goto free_opp; |
7f8538eb | 329 | } |
f47b72a1 VK |
330 | |
331 | /* OPP to select on device suspend */ | |
332 | if (of_property_read_bool(np, "opp-suspend")) { | |
333 | if (opp_table->suspend_opp) { | |
334 | dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n", | |
335 | __func__, opp_table->suspend_opp->rate, | |
336 | new_opp->rate); | |
337 | } else { | |
338 | new_opp->suspend = true; | |
339 | opp_table->suspend_opp = new_opp; | |
340 | } | |
341 | } | |
342 | ||
343 | if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) | |
344 | opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; | |
345 | ||
f47b72a1 | 346 | pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", |
0f0fe7e0 | 347 | __func__, new_opp->turbo, new_opp->rate, |
dfbe4678 VK |
348 | new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, |
349 | new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns); | |
f47b72a1 VK |
350 | |
351 | /* | |
352 | * Notify the changes in the availability of the operable | |
353 | * frequency/voltage list. | |
354 | */ | |
355 | srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp); | |
356 | return 0; | |
357 | ||
358 | free_opp: | |
8cd2f6e8 VK |
359 | _opp_free(new_opp); |
360 | ||
f47b72a1 VK |
361 | return ret; |
362 | } | |
363 | ||
364 | /* Initializes OPP tables based on new bindings */ | |
365 | static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np) | |
366 | { | |
367 | struct device_node *np; | |
368 | struct opp_table *opp_table; | |
369 | int ret = 0, count = 0; | |
370 | ||
371 | mutex_lock(&opp_table_lock); | |
372 | ||
373 | opp_table = _managed_opp(opp_np); | |
374 | if (opp_table) { | |
375 | /* OPPs are already managed */ | |
376 | if (!_add_opp_dev(dev, opp_table)) | |
377 | ret = -ENOMEM; | |
8cd2f6e8 VK |
378 | goto unlock; |
379 | } | |
380 | ||
381 | opp_table = _add_opp_table(dev); | |
382 | if (!opp_table) { | |
383 | ret = -ENOMEM; | |
384 | goto unlock; | |
f47b72a1 | 385 | } |
f47b72a1 VK |
386 | |
387 | /* We have opp-table node now, iterate over it and add OPPs */ | |
388 | for_each_available_child_of_node(opp_np, np) { | |
389 | count++; | |
390 | ||
8cd2f6e8 | 391 | ret = _opp_add_static_v2(opp_table, dev, np); |
f47b72a1 VK |
392 | if (ret) { |
393 | dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, | |
394 | ret); | |
395 | goto free_table; | |
396 | } | |
397 | } | |
398 | ||
399 | /* There should be one of more OPP defined */ | |
8cd2f6e8 VK |
400 | if (WARN_ON(!count)) { |
401 | ret = -ENOENT; | |
f47b72a1 VK |
402 | goto free_table; |
403 | } | |
404 | ||
405 | opp_table->np = opp_np; | |
79ee2e8f VK |
406 | if (of_property_read_bool(opp_np, "opp-shared")) |
407 | opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED; | |
408 | else | |
409 | opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE; | |
f47b72a1 | 410 | |
8cd2f6e8 | 411 | goto unlock; |
f47b72a1 VK |
412 | |
413 | free_table: | |
8cd2f6e8 VK |
414 | _dev_pm_opp_remove_table(opp_table, dev, false); |
415 | unlock: | |
416 | mutex_unlock(&opp_table_lock); | |
f47b72a1 VK |
417 | |
418 | return ret; | |
419 | } | |
420 | ||
421 | /* Initializes OPP tables based on old-deprecated bindings */ | |
422 | static int _of_add_opp_table_v1(struct device *dev) | |
423 | { | |
8cd2f6e8 | 424 | struct opp_table *opp_table; |
f47b72a1 VK |
425 | const struct property *prop; |
426 | const __be32 *val; | |
8cd2f6e8 | 427 | int nr, ret = 0; |
f47b72a1 VK |
428 | |
429 | prop = of_find_property(dev->of_node, "operating-points", NULL); | |
430 | if (!prop) | |
431 | return -ENODEV; | |
432 | if (!prop->value) | |
433 | return -ENODATA; | |
434 | ||
435 | /* | |
436 | * Each OPP is a set of tuples consisting of frequency and | |
437 | * voltage like <freq-kHz vol-uV>. | |
438 | */ | |
439 | nr = prop->length / sizeof(u32); | |
440 | if (nr % 2) { | |
441 | dev_err(dev, "%s: Invalid OPP table\n", __func__); | |
442 | return -EINVAL; | |
443 | } | |
444 | ||
8cd2f6e8 VK |
445 | mutex_lock(&opp_table_lock); |
446 | ||
447 | opp_table = _add_opp_table(dev); | |
448 | if (!opp_table) { | |
449 | ret = -ENOMEM; | |
450 | goto unlock; | |
451 | } | |
452 | ||
f47b72a1 VK |
453 | val = prop->value; |
454 | while (nr) { | |
455 | unsigned long freq = be32_to_cpup(val++) * 1000; | |
456 | unsigned long volt = be32_to_cpup(val++); | |
457 | ||
8cd2f6e8 | 458 | ret = _opp_add_v1(opp_table, dev, freq, volt, false); |
04a86a84 VK |
459 | if (ret) { |
460 | dev_err(dev, "%s: Failed to add OPP %ld (%d)\n", | |
461 | __func__, freq, ret); | |
8cd2f6e8 VK |
462 | _dev_pm_opp_remove_table(opp_table, dev, false); |
463 | break; | |
04a86a84 | 464 | } |
f47b72a1 VK |
465 | nr -= 2; |
466 | } | |
467 | ||
8cd2f6e8 VK |
468 | unlock: |
469 | mutex_unlock(&opp_table_lock); | |
470 | return ret; | |
f47b72a1 VK |
471 | } |
472 | ||
473 | /** | |
474 | * dev_pm_opp_of_add_table() - Initialize opp table from device tree | |
475 | * @dev: device pointer used to lookup OPP table. | |
476 | * | |
477 | * Register the initial OPP table with the OPP library for given device. | |
478 | * | |
479 | * Locking: The internal opp_table and opp structures are RCU protected. | |
480 | * Hence this function indirectly uses RCU updater strategy with mutex locks | |
481 | * to keep the integrity of the internal data structures. Callers should ensure | |
482 | * that this function is *NOT* called under RCU protection or in contexts where | |
483 | * mutex cannot be locked. | |
484 | * | |
485 | * Return: | |
486 | * 0 On success OR | |
487 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
488 | * -EEXIST Freq are same and volt are different OR | |
489 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
490 | * -ENOMEM Memory allocation failure | |
491 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
492 | * in device node. | |
493 | * -ENODATA when empty 'operating-points' property is found | |
494 | * -EINVAL when invalid entries are found in opp-v2 table | |
495 | */ | |
496 | int dev_pm_opp_of_add_table(struct device *dev) | |
497 | { | |
498 | struct device_node *opp_np; | |
499 | int ret; | |
500 | ||
501 | /* | |
502 | * OPPs have two version of bindings now. The older one is deprecated, | |
503 | * try for the new binding first. | |
504 | */ | |
505 | opp_np = _of_get_opp_desc_node(dev); | |
506 | if (!opp_np) { | |
507 | /* | |
508 | * Try old-deprecated bindings for backward compatibility with | |
509 | * older dtbs. | |
510 | */ | |
511 | return _of_add_opp_table_v1(dev); | |
512 | } | |
513 | ||
514 | ret = _of_add_opp_table_v2(dev, opp_np); | |
515 | of_node_put(opp_np); | |
516 | ||
517 | return ret; | |
518 | } | |
519 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); | |
520 | ||
521 | /* CPU device specific helpers */ | |
522 | ||
523 | /** | |
524 | * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask | |
525 | * @cpumask: cpumask for which OPP table needs to be removed | |
526 | * | |
527 | * This removes the OPP tables for CPUs present in the @cpumask. | |
528 | * This should be used only to remove static entries created from DT. | |
529 | * | |
530 | * Locking: The internal opp_table and opp structures are RCU protected. | |
531 | * Hence this function internally uses RCU updater strategy with mutex locks | |
532 | * to keep the integrity of the internal data structures. Callers should ensure | |
533 | * that this function is *NOT* called under RCU protection or in contexts where | |
534 | * mutex cannot be locked. | |
535 | */ | |
536 | void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) | |
537 | { | |
538 | _dev_pm_opp_cpumask_remove_table(cpumask, true); | |
539 | } | |
540 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); | |
541 | ||
542 | /** | |
543 | * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask | |
544 | * @cpumask: cpumask for which OPP table needs to be added. | |
545 | * | |
546 | * This adds the OPP tables for CPUs present in the @cpumask. | |
547 | * | |
548 | * Locking: The internal opp_table and opp structures are RCU protected. | |
549 | * Hence this function internally uses RCU updater strategy with mutex locks | |
550 | * to keep the integrity of the internal data structures. Callers should ensure | |
551 | * that this function is *NOT* called under RCU protection or in contexts where | |
552 | * mutex cannot be locked. | |
553 | */ | |
554 | int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) | |
555 | { | |
556 | struct device *cpu_dev; | |
557 | int cpu, ret = 0; | |
558 | ||
559 | WARN_ON(cpumask_empty(cpumask)); | |
560 | ||
561 | for_each_cpu(cpu, cpumask) { | |
562 | cpu_dev = get_cpu_device(cpu); | |
563 | if (!cpu_dev) { | |
564 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
565 | cpu); | |
566 | continue; | |
567 | } | |
568 | ||
569 | ret = dev_pm_opp_of_add_table(cpu_dev); | |
570 | if (ret) { | |
571 | pr_err("%s: couldn't find opp table for cpu:%d, %d\n", | |
572 | __func__, cpu, ret); | |
573 | ||
574 | /* Free all other OPPs */ | |
575 | dev_pm_opp_of_cpumask_remove_table(cpumask); | |
576 | break; | |
577 | } | |
578 | } | |
579 | ||
580 | return ret; | |
581 | } | |
582 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); | |
583 | ||
584 | /* | |
585 | * Works only for OPP v2 bindings. | |
586 | * | |
587 | * Returns -ENOENT if operating-points-v2 bindings aren't supported. | |
588 | */ | |
589 | /** | |
590 | * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with | |
591 | * @cpu_dev using operating-points-v2 | |
592 | * bindings. | |
593 | * | |
594 | * @cpu_dev: CPU device for which we do this operation | |
595 | * @cpumask: cpumask to update with information of sharing CPUs | |
596 | * | |
597 | * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. | |
598 | * | |
599 | * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. | |
600 | * | |
601 | * Locking: The internal opp_table and opp structures are RCU protected. | |
602 | * Hence this function internally uses RCU updater strategy with mutex locks | |
603 | * to keep the integrity of the internal data structures. Callers should ensure | |
604 | * that this function is *NOT* called under RCU protection or in contexts where | |
605 | * mutex cannot be locked. | |
606 | */ | |
607 | int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, | |
608 | struct cpumask *cpumask) | |
609 | { | |
610 | struct device_node *np, *tmp_np; | |
611 | struct device *tcpu_dev; | |
612 | int cpu, ret = 0; | |
613 | ||
614 | /* Get OPP descriptor node */ | |
615 | np = _of_get_opp_desc_node(cpu_dev); | |
616 | if (!np) { | |
349aa92e | 617 | dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__); |
f47b72a1 VK |
618 | return -ENOENT; |
619 | } | |
620 | ||
621 | cpumask_set_cpu(cpu_dev->id, cpumask); | |
622 | ||
623 | /* OPPs are shared ? */ | |
624 | if (!of_property_read_bool(np, "opp-shared")) | |
625 | goto put_cpu_node; | |
626 | ||
627 | for_each_possible_cpu(cpu) { | |
628 | if (cpu == cpu_dev->id) | |
629 | continue; | |
630 | ||
631 | tcpu_dev = get_cpu_device(cpu); | |
632 | if (!tcpu_dev) { | |
633 | dev_err(cpu_dev, "%s: failed to get cpu%d device\n", | |
634 | __func__, cpu); | |
635 | ret = -ENODEV; | |
636 | goto put_cpu_node; | |
637 | } | |
638 | ||
639 | /* Get OPP descriptor node */ | |
640 | tmp_np = _of_get_opp_desc_node(tcpu_dev); | |
641 | if (!tmp_np) { | |
349aa92e | 642 | dev_err(tcpu_dev, "%s: Couldn't find opp node.\n", |
f47b72a1 VK |
643 | __func__); |
644 | ret = -ENOENT; | |
645 | goto put_cpu_node; | |
646 | } | |
647 | ||
648 | /* CPUs are sharing opp node */ | |
649 | if (np == tmp_np) | |
650 | cpumask_set_cpu(cpu, cpumask); | |
651 | ||
652 | of_node_put(tmp_np); | |
653 | } | |
654 | ||
655 | put_cpu_node: | |
656 | of_node_put(np); | |
657 | return ret; | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); |