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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f47b72a1 VK |
2 | /* |
3 | * Generic OPP OF helpers | |
4 | * | |
5 | * Copyright (C) 2009-2010 Texas Instruments Incorporated. | |
6 | * Nishanth Menon | |
7 | * Romit Dasgupta | |
8 | * Kevin Hilman | |
f47b72a1 VK |
9 | */ |
10 | ||
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
12 | ||
13 | #include <linux/cpu.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/device.h> | |
9867999f | 16 | #include <linux/of_device.h> |
3ba98324 | 17 | #include <linux/pm_domain.h> |
dfbe4678 | 18 | #include <linux/slab.h> |
f47b72a1 | 19 | #include <linux/export.h> |
a4f342b9 | 20 | #include <linux/energy_model.h> |
f47b72a1 VK |
21 | |
22 | #include "opp.h" | |
23 | ||
f06ed90e VK |
24 | /* |
25 | * Returns opp descriptor node for a device node, caller must | |
26 | * do of_node_put(). | |
27 | */ | |
28 | static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np, | |
29 | int index) | |
30 | { | |
31 | /* "operating-points-v2" can be an array for power domain providers */ | |
32 | return of_parse_phandle(np, "operating-points-v2", index); | |
33 | } | |
34 | ||
35 | /* Returns opp descriptor node for a device, caller must do of_node_put() */ | |
36 | struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev) | |
37 | { | |
38 | return _opp_of_get_opp_desc_node(dev->of_node, 0); | |
39 | } | |
40 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node); | |
41 | ||
283d55e6 | 42 | struct opp_table *_managed_opp(struct device *dev, int index) |
f47b72a1 | 43 | { |
b83c1899 | 44 | struct opp_table *opp_table, *managed_table = NULL; |
283d55e6 | 45 | struct device_node *np; |
b83c1899 | 46 | |
283d55e6 VK |
47 | np = _opp_of_get_opp_desc_node(dev->of_node, index); |
48 | if (!np) | |
49 | return NULL; | |
f47b72a1 | 50 | |
052c6f19 | 51 | list_for_each_entry(opp_table, &opp_tables, node) { |
f47b72a1 VK |
52 | if (opp_table->np == np) { |
53 | /* | |
54 | * Multiple devices can point to the same OPP table and | |
55 | * so will have same node-pointer, np. | |
56 | * | |
57 | * But the OPPs will be considered as shared only if the | |
58 | * OPP table contains a "opp-shared" property. | |
59 | */ | |
b83c1899 VK |
60 | if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) { |
61 | _get_opp_table_kref(opp_table); | |
62 | managed_table = opp_table; | |
63 | } | |
79ee2e8f | 64 | |
b83c1899 | 65 | break; |
f47b72a1 VK |
66 | } |
67 | } | |
68 | ||
283d55e6 | 69 | of_node_put(np); |
b83c1899 VK |
70 | |
71 | return managed_table; | |
f47b72a1 VK |
72 | } |
73 | ||
5d6d106f VK |
74 | /* The caller must call dev_pm_opp_put() after the OPP is used */ |
75 | static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table, | |
76 | struct device_node *opp_np) | |
77 | { | |
78 | struct dev_pm_opp *opp; | |
79 | ||
5d6d106f VK |
80 | mutex_lock(&opp_table->lock); |
81 | ||
82 | list_for_each_entry(opp, &opp_table->opp_list, node) { | |
83 | if (opp->np == opp_np) { | |
84 | dev_pm_opp_get(opp); | |
85 | mutex_unlock(&opp_table->lock); | |
86 | return opp; | |
87 | } | |
88 | } | |
89 | ||
90 | mutex_unlock(&opp_table->lock); | |
91 | ||
92 | return NULL; | |
93 | } | |
94 | ||
95 | static struct device_node *of_parse_required_opp(struct device_node *np, | |
96 | int index) | |
97 | { | |
98 | struct device_node *required_np; | |
99 | ||
100 | required_np = of_parse_phandle(np, "required-opps", index); | |
101 | if (unlikely(!required_np)) { | |
102 | pr_err("%s: Unable to parse required-opps: %pOF, index: %d\n", | |
103 | __func__, np, index); | |
104 | } | |
105 | ||
106 | return required_np; | |
107 | } | |
108 | ||
109 | /* The caller must call dev_pm_opp_put_opp_table() after the table is used */ | |
110 | static struct opp_table *_find_table_of_opp_np(struct device_node *opp_np) | |
111 | { | |
112 | struct opp_table *opp_table; | |
699e21e4 | 113 | struct device_node *opp_table_np; |
5d6d106f VK |
114 | |
115 | lockdep_assert_held(&opp_table_lock); | |
116 | ||
699e21e4 VK |
117 | opp_table_np = of_get_parent(opp_np); |
118 | if (!opp_table_np) | |
119 | goto err; | |
120 | ||
121 | /* It is safe to put the node now as all we need now is its address */ | |
122 | of_node_put(opp_table_np); | |
123 | ||
5d6d106f | 124 | list_for_each_entry(opp_table, &opp_tables, node) { |
699e21e4 | 125 | if (opp_table_np == opp_table->np) { |
5d6d106f VK |
126 | _get_opp_table_kref(opp_table); |
127 | return opp_table; | |
128 | } | |
129 | } | |
130 | ||
699e21e4 | 131 | err: |
5d6d106f VK |
132 | return ERR_PTR(-ENODEV); |
133 | } | |
134 | ||
135 | /* Free resources previously acquired by _opp_table_alloc_required_tables() */ | |
136 | static void _opp_table_free_required_tables(struct opp_table *opp_table) | |
137 | { | |
138 | struct opp_table **required_opp_tables = opp_table->required_opp_tables; | |
139 | int i; | |
140 | ||
141 | if (!required_opp_tables) | |
142 | return; | |
143 | ||
144 | for (i = 0; i < opp_table->required_opp_count; i++) { | |
145 | if (IS_ERR_OR_NULL(required_opp_tables[i])) | |
146 | break; | |
147 | ||
148 | dev_pm_opp_put_opp_table(required_opp_tables[i]); | |
149 | } | |
150 | ||
151 | kfree(required_opp_tables); | |
152 | ||
153 | opp_table->required_opp_count = 0; | |
154 | opp_table->required_opp_tables = NULL; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Populate all devices and opp tables which are part of "required-opps" list. | |
159 | * Checking only the first OPP node should be enough. | |
160 | */ | |
161 | static void _opp_table_alloc_required_tables(struct opp_table *opp_table, | |
162 | struct device *dev, | |
163 | struct device_node *opp_np) | |
164 | { | |
165 | struct opp_table **required_opp_tables; | |
166 | struct device_node *required_np, *np; | |
c0ab9e08 | 167 | int count, i; |
5d6d106f VK |
168 | |
169 | /* Traversing the first OPP node is all we need */ | |
170 | np = of_get_next_available_child(opp_np, NULL); | |
171 | if (!np) { | |
172 | dev_err(dev, "Empty OPP table\n"); | |
173 | return; | |
174 | } | |
175 | ||
176 | count = of_count_phandle_with_args(np, "required-opps", NULL); | |
177 | if (!count) | |
178 | goto put_np; | |
179 | ||
180 | required_opp_tables = kcalloc(count, sizeof(*required_opp_tables), | |
181 | GFP_KERNEL); | |
c0ab9e08 | 182 | if (!required_opp_tables) |
5d6d106f VK |
183 | goto put_np; |
184 | ||
185 | opp_table->required_opp_tables = required_opp_tables; | |
186 | opp_table->required_opp_count = count; | |
187 | ||
188 | for (i = 0; i < count; i++) { | |
189 | required_np = of_parse_required_opp(np, i); | |
190 | if (!required_np) | |
191 | goto free_required_tables; | |
192 | ||
193 | required_opp_tables[i] = _find_table_of_opp_np(required_np); | |
194 | of_node_put(required_np); | |
195 | ||
196 | if (IS_ERR(required_opp_tables[i])) | |
197 | goto free_required_tables; | |
198 | ||
199 | /* | |
200 | * We only support genpd's OPPs in the "required-opps" for now, | |
201 | * as we don't know how much about other cases. Error out if the | |
202 | * required OPP doesn't belong to a genpd. | |
203 | */ | |
204 | if (!required_opp_tables[i]->is_genpd) { | |
205 | dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n", | |
206 | required_np); | |
207 | goto free_required_tables; | |
208 | } | |
209 | } | |
210 | ||
211 | goto put_np; | |
212 | ||
213 | free_required_tables: | |
214 | _opp_table_free_required_tables(opp_table); | |
215 | put_np: | |
216 | of_node_put(np); | |
217 | } | |
218 | ||
eb7c8743 VK |
219 | void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, |
220 | int index) | |
f47b72a1 | 221 | { |
f06ed90e VK |
222 | struct device_node *np, *opp_np; |
223 | u32 val; | |
f47b72a1 VK |
224 | |
225 | /* | |
226 | * Only required for backward compatibility with v1 bindings, but isn't | |
227 | * harmful for other cases. And so we do it unconditionally. | |
228 | */ | |
229 | np = of_node_get(dev->of_node); | |
f06ed90e VK |
230 | if (!np) |
231 | return; | |
232 | ||
233 | if (!of_property_read_u32(np, "clock-latency", &val)) | |
234 | opp_table->clock_latency_ns_max = val; | |
235 | of_property_read_u32(np, "voltage-tolerance", | |
236 | &opp_table->voltage_tolerance_v1); | |
237 | ||
61d8e7c7 VK |
238 | if (of_find_property(np, "#power-domain-cells", NULL)) |
239 | opp_table->is_genpd = true; | |
240 | ||
f06ed90e VK |
241 | /* Get OPP table node */ |
242 | opp_np = _opp_of_get_opp_desc_node(np, index); | |
243 | of_node_put(np); | |
244 | ||
245 | if (!opp_np) | |
246 | return; | |
247 | ||
248 | if (of_property_read_bool(opp_np, "opp-shared")) | |
249 | opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED; | |
250 | else | |
251 | opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE; | |
252 | ||
253 | opp_table->np = opp_np; | |
254 | ||
5d6d106f | 255 | _opp_table_alloc_required_tables(opp_table, dev, opp_np); |
f06ed90e | 256 | of_node_put(opp_np); |
f47b72a1 VK |
257 | } |
258 | ||
5d6d106f VK |
259 | void _of_clear_opp_table(struct opp_table *opp_table) |
260 | { | |
261 | _opp_table_free_required_tables(opp_table); | |
262 | } | |
263 | ||
da544b61 VK |
264 | /* |
265 | * Release all resources previously acquired with a call to | |
266 | * _of_opp_alloc_required_opps(). | |
267 | */ | |
268 | void _of_opp_free_required_opps(struct opp_table *opp_table, | |
269 | struct dev_pm_opp *opp) | |
270 | { | |
271 | struct dev_pm_opp **required_opps = opp->required_opps; | |
272 | int i; | |
273 | ||
274 | if (!required_opps) | |
275 | return; | |
276 | ||
277 | for (i = 0; i < opp_table->required_opp_count; i++) { | |
278 | if (!required_opps[i]) | |
279 | break; | |
280 | ||
281 | /* Put the reference back */ | |
282 | dev_pm_opp_put(required_opps[i]); | |
283 | } | |
284 | ||
285 | kfree(required_opps); | |
286 | opp->required_opps = NULL; | |
287 | } | |
288 | ||
289 | /* Populate all required OPPs which are part of "required-opps" list */ | |
290 | static int _of_opp_alloc_required_opps(struct opp_table *opp_table, | |
291 | struct dev_pm_opp *opp) | |
292 | { | |
293 | struct dev_pm_opp **required_opps; | |
294 | struct opp_table *required_table; | |
295 | struct device_node *np; | |
296 | int i, ret, count = opp_table->required_opp_count; | |
297 | ||
298 | if (!count) | |
299 | return 0; | |
300 | ||
301 | required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL); | |
302 | if (!required_opps) | |
303 | return -ENOMEM; | |
304 | ||
305 | opp->required_opps = required_opps; | |
306 | ||
307 | for (i = 0; i < count; i++) { | |
308 | required_table = opp_table->required_opp_tables[i]; | |
309 | ||
310 | np = of_parse_required_opp(opp->np, i); | |
311 | if (unlikely(!np)) { | |
312 | ret = -ENODEV; | |
313 | goto free_required_opps; | |
314 | } | |
315 | ||
316 | required_opps[i] = _find_opp_of_np(required_table, np); | |
317 | of_node_put(np); | |
318 | ||
319 | if (!required_opps[i]) { | |
320 | pr_err("%s: Unable to find required OPP node: %pOF (%d)\n", | |
321 | __func__, opp->np, i); | |
322 | ret = -ENODEV; | |
323 | goto free_required_opps; | |
324 | } | |
325 | } | |
326 | ||
327 | return 0; | |
328 | ||
329 | free_required_opps: | |
330 | _of_opp_free_required_opps(opp_table, opp); | |
331 | ||
332 | return ret; | |
333 | } | |
334 | ||
f47b72a1 VK |
335 | static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, |
336 | struct device_node *np) | |
337 | { | |
338 | unsigned int count = opp_table->supported_hw_count; | |
339 | u32 version; | |
340 | int ret; | |
341 | ||
a4ee4545 DG |
342 | if (!opp_table->supported_hw) { |
343 | /* | |
344 | * In the case that no supported_hw has been set by the | |
345 | * platform but there is an opp-supported-hw value set for | |
346 | * an OPP then the OPP should not be enabled as there is | |
347 | * no way to see if the hardware supports it. | |
348 | */ | |
349 | if (of_find_property(np, "opp-supported-hw", NULL)) | |
350 | return false; | |
351 | else | |
352 | return true; | |
353 | } | |
f47b72a1 VK |
354 | |
355 | while (count--) { | |
356 | ret = of_property_read_u32_index(np, "opp-supported-hw", count, | |
357 | &version); | |
358 | if (ret) { | |
359 | dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", | |
360 | __func__, count, ret); | |
361 | return false; | |
362 | } | |
363 | ||
364 | /* Both of these are bitwise masks of the versions */ | |
365 | if (!(version & opp_table->supported_hw[count])) | |
366 | return false; | |
367 | } | |
368 | ||
369 | return true; | |
370 | } | |
371 | ||
f47b72a1 VK |
372 | static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, |
373 | struct opp_table *opp_table) | |
374 | { | |
dfbe4678 | 375 | u32 *microvolt, *microamp = NULL; |
46f48aca | 376 | int supplies = opp_table->regulator_count, vcount, icount, ret, i, j; |
f47b72a1 VK |
377 | struct property *prop = NULL; |
378 | char name[NAME_MAX]; | |
379 | ||
380 | /* Search for "opp-microvolt-<name>" */ | |
381 | if (opp_table->prop_name) { | |
382 | snprintf(name, sizeof(name), "opp-microvolt-%s", | |
383 | opp_table->prop_name); | |
384 | prop = of_find_property(opp->np, name, NULL); | |
385 | } | |
386 | ||
387 | if (!prop) { | |
388 | /* Search for "opp-microvolt" */ | |
389 | sprintf(name, "opp-microvolt"); | |
390 | prop = of_find_property(opp->np, name, NULL); | |
391 | ||
392 | /* Missing property isn't a problem, but an invalid entry is */ | |
688a48b0 | 393 | if (!prop) { |
46f48aca VK |
394 | if (unlikely(supplies == -1)) { |
395 | /* Initialize regulator_count */ | |
396 | opp_table->regulator_count = 0; | |
397 | return 0; | |
398 | } | |
399 | ||
400 | if (!supplies) | |
688a48b0 VK |
401 | return 0; |
402 | ||
403 | dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n", | |
404 | __func__); | |
405 | return -EINVAL; | |
406 | } | |
f47b72a1 VK |
407 | } |
408 | ||
46f48aca VK |
409 | if (unlikely(supplies == -1)) { |
410 | /* Initialize regulator_count */ | |
411 | supplies = opp_table->regulator_count = 1; | |
412 | } else if (unlikely(!supplies)) { | |
413 | dev_err(dev, "%s: opp-microvolt wasn't expected\n", __func__); | |
414 | return -EINVAL; | |
415 | } | |
416 | ||
dfbe4678 VK |
417 | vcount = of_property_count_u32_elems(opp->np, name); |
418 | if (vcount < 0) { | |
f47b72a1 | 419 | dev_err(dev, "%s: Invalid %s property (%d)\n", |
dfbe4678 VK |
420 | __func__, name, vcount); |
421 | return vcount; | |
f47b72a1 VK |
422 | } |
423 | ||
dfbe4678 VK |
424 | /* There can be one or three elements per supply */ |
425 | if (vcount != supplies && vcount != supplies * 3) { | |
426 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
427 | __func__, name, vcount, supplies); | |
f47b72a1 VK |
428 | return -EINVAL; |
429 | } | |
430 | ||
dfbe4678 VK |
431 | microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); |
432 | if (!microvolt) | |
433 | return -ENOMEM; | |
434 | ||
435 | ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); | |
f47b72a1 VK |
436 | if (ret) { |
437 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); | |
dfbe4678 VK |
438 | ret = -EINVAL; |
439 | goto free_microvolt; | |
f47b72a1 VK |
440 | } |
441 | ||
442 | /* Search for "opp-microamp-<name>" */ | |
443 | prop = NULL; | |
444 | if (opp_table->prop_name) { | |
445 | snprintf(name, sizeof(name), "opp-microamp-%s", | |
446 | opp_table->prop_name); | |
447 | prop = of_find_property(opp->np, name, NULL); | |
448 | } | |
449 | ||
450 | if (!prop) { | |
451 | /* Search for "opp-microamp" */ | |
452 | sprintf(name, "opp-microamp"); | |
453 | prop = of_find_property(opp->np, name, NULL); | |
454 | } | |
455 | ||
dfbe4678 VK |
456 | if (prop) { |
457 | icount = of_property_count_u32_elems(opp->np, name); | |
458 | if (icount < 0) { | |
459 | dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, | |
460 | name, icount); | |
461 | ret = icount; | |
462 | goto free_microvolt; | |
463 | } | |
f47b72a1 | 464 | |
dfbe4678 VK |
465 | if (icount != supplies) { |
466 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
467 | __func__, name, icount, supplies); | |
468 | ret = -EINVAL; | |
469 | goto free_microvolt; | |
470 | } | |
471 | ||
472 | microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); | |
473 | if (!microamp) { | |
474 | ret = -EINVAL; | |
475 | goto free_microvolt; | |
476 | } | |
477 | ||
478 | ret = of_property_read_u32_array(opp->np, name, microamp, | |
479 | icount); | |
480 | if (ret) { | |
481 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, | |
482 | name, ret); | |
483 | ret = -EINVAL; | |
484 | goto free_microamp; | |
485 | } | |
486 | } | |
487 | ||
488 | for (i = 0, j = 0; i < supplies; i++) { | |
489 | opp->supplies[i].u_volt = microvolt[j++]; | |
490 | ||
491 | if (vcount == supplies) { | |
492 | opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; | |
493 | opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; | |
494 | } else { | |
495 | opp->supplies[i].u_volt_min = microvolt[j++]; | |
496 | opp->supplies[i].u_volt_max = microvolt[j++]; | |
497 | } | |
498 | ||
499 | if (microamp) | |
500 | opp->supplies[i].u_amp = microamp[i]; | |
501 | } | |
502 | ||
503 | free_microamp: | |
504 | kfree(microamp); | |
505 | free_microvolt: | |
506 | kfree(microvolt); | |
507 | ||
508 | return ret; | |
f47b72a1 VK |
509 | } |
510 | ||
511 | /** | |
512 | * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT | |
513 | * entries | |
514 | * @dev: device pointer used to lookup OPP table. | |
515 | * | |
516 | * Free OPPs created using static entries present in DT. | |
f47b72a1 VK |
517 | */ |
518 | void dev_pm_opp_of_remove_table(struct device *dev) | |
519 | { | |
2a4eb735 | 520 | _dev_pm_opp_find_and_remove_table(dev); |
f47b72a1 VK |
521 | } |
522 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); | |
523 | ||
f47b72a1 VK |
524 | /** |
525 | * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) | |
8cd2f6e8 | 526 | * @opp_table: OPP table |
f47b72a1 VK |
527 | * @dev: device for which we do this operation |
528 | * @np: device node | |
529 | * | |
530 | * This function adds an opp definition to the opp table and returns status. The | |
531 | * opp can be controlled using dev_pm_opp_enable/disable functions and may be | |
532 | * removed by dev_pm_opp_remove. | |
533 | * | |
f47b72a1 | 534 | * Return: |
deac8703 DG |
535 | * Valid OPP pointer: |
536 | * On success | |
537 | * NULL: | |
f47b72a1 | 538 | * Duplicate OPPs (both freq and volt are same) and opp->available |
deac8703 DG |
539 | * OR if the OPP is not supported by hardware. |
540 | * ERR_PTR(-EEXIST): | |
541 | * Freq are same and volt are different OR | |
f47b72a1 | 542 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
deac8703 DG |
543 | * ERR_PTR(-ENOMEM): |
544 | * Memory allocation failure | |
545 | * ERR_PTR(-EINVAL): | |
546 | * Failed parsing the OPP node | |
f47b72a1 | 547 | */ |
deac8703 DG |
548 | static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table, |
549 | struct device *dev, struct device_node *np) | |
f47b72a1 | 550 | { |
f47b72a1 | 551 | struct dev_pm_opp *new_opp; |
6a89e012 | 552 | u64 rate = 0; |
f47b72a1 VK |
553 | u32 val; |
554 | int ret; | |
a1e8c136 | 555 | bool rate_not_available = false; |
f47b72a1 | 556 | |
8cd2f6e8 VK |
557 | new_opp = _opp_allocate(opp_table); |
558 | if (!new_opp) | |
deac8703 | 559 | return ERR_PTR(-ENOMEM); |
f47b72a1 VK |
560 | |
561 | ret = of_property_read_u64(np, "opp-hz", &rate); | |
562 | if (ret < 0) { | |
a1e8c136 | 563 | /* "opp-hz" is optional for devices like power domains. */ |
61d8e7c7 | 564 | if (!opp_table->is_genpd) { |
a1e8c136 VK |
565 | dev_err(dev, "%s: opp-hz not found\n", __func__); |
566 | goto free_opp; | |
567 | } | |
568 | ||
569 | rate_not_available = true; | |
570 | } else { | |
571 | /* | |
572 | * Rate is defined as an unsigned long in clk API, and so | |
573 | * casting explicitly to its type. Must be fixed once rate is 64 | |
574 | * bit guaranteed in clk API. | |
575 | */ | |
576 | new_opp->rate = (unsigned long)rate; | |
f47b72a1 VK |
577 | } |
578 | ||
5b93ac54 RN |
579 | of_property_read_u32(np, "opp-level", &new_opp->level); |
580 | ||
f47b72a1 VK |
581 | /* Check if the OPP supports hardware's hierarchy of versions or not */ |
582 | if (!_opp_is_supported(dev, opp_table, np)) { | |
583 | dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); | |
584 | goto free_opp; | |
585 | } | |
586 | ||
f47b72a1 VK |
587 | new_opp->turbo = of_property_read_bool(np, "turbo-mode"); |
588 | ||
589 | new_opp->np = np; | |
590 | new_opp->dynamic = false; | |
591 | new_opp->available = true; | |
592 | ||
da544b61 VK |
593 | ret = _of_opp_alloc_required_opps(opp_table, new_opp); |
594 | if (ret) | |
595 | goto free_opp; | |
596 | ||
f47b72a1 VK |
597 | if (!of_property_read_u32(np, "clock-latency-ns", &val)) |
598 | new_opp->clock_latency_ns = val; | |
599 | ||
600 | ret = opp_parse_supplies(new_opp, dev, opp_table); | |
601 | if (ret) | |
da544b61 | 602 | goto free_required_opps; |
f47b72a1 | 603 | |
ca1b5d77 VK |
604 | if (opp_table->is_genpd) |
605 | new_opp->pstate = pm_genpd_opp_to_performance_state(dev, new_opp); | |
f47b72a1 | 606 | |
a1e8c136 | 607 | ret = _opp_add(dev, new_opp, opp_table, rate_not_available); |
7f8538eb VK |
608 | if (ret) { |
609 | /* Don't return error for duplicate OPPs */ | |
610 | if (ret == -EBUSY) | |
611 | ret = 0; | |
da544b61 | 612 | goto free_required_opps; |
7f8538eb | 613 | } |
f47b72a1 VK |
614 | |
615 | /* OPP to select on device suspend */ | |
616 | if (of_property_read_bool(np, "opp-suspend")) { | |
617 | if (opp_table->suspend_opp) { | |
45275517 AH |
618 | /* Pick the OPP with higher rate as suspend OPP */ |
619 | if (new_opp->rate > opp_table->suspend_opp->rate) { | |
620 | opp_table->suspend_opp->suspend = false; | |
621 | new_opp->suspend = true; | |
622 | opp_table->suspend_opp = new_opp; | |
623 | } | |
f47b72a1 VK |
624 | } else { |
625 | new_opp->suspend = true; | |
626 | opp_table->suspend_opp = new_opp; | |
627 | } | |
628 | } | |
629 | ||
630 | if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) | |
631 | opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; | |
632 | ||
f47b72a1 | 633 | pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", |
0f0fe7e0 | 634 | __func__, new_opp->turbo, new_opp->rate, |
dfbe4678 VK |
635 | new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, |
636 | new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns); | |
f47b72a1 VK |
637 | |
638 | /* | |
639 | * Notify the changes in the availability of the operable | |
640 | * frequency/voltage list. | |
641 | */ | |
052c6f19 | 642 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
deac8703 | 643 | return new_opp; |
f47b72a1 | 644 | |
da544b61 VK |
645 | free_required_opps: |
646 | _of_opp_free_required_opps(opp_table, new_opp); | |
f47b72a1 | 647 | free_opp: |
8cd2f6e8 VK |
648 | _opp_free(new_opp); |
649 | ||
deac8703 | 650 | return ERR_PTR(ret); |
f47b72a1 VK |
651 | } |
652 | ||
653 | /* Initializes OPP tables based on new bindings */ | |
5ed4cecd | 654 | static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table) |
f47b72a1 VK |
655 | { |
656 | struct device_node *np; | |
283d55e6 | 657 | int ret, count = 0, pstate_count = 0; |
3ba98324 | 658 | struct dev_pm_opp *opp; |
f47b72a1 | 659 | |
283d55e6 VK |
660 | /* OPP table is already initialized for the device */ |
661 | if (opp_table->parsed_static_opps) { | |
662 | kref_get(&opp_table->list_kref); | |
663 | return 0; | |
664 | } | |
665 | ||
b19c2355 VK |
666 | /* |
667 | * Re-initialize list_kref every time we add static OPPs to the OPP | |
668 | * table as the reference count may be 0 after the last tie static OPPs | |
669 | * were removed. | |
670 | */ | |
671 | kref_init(&opp_table->list_kref); | |
672 | ||
f47b72a1 | 673 | /* We have opp-table node now, iterate over it and add OPPs */ |
5ed4cecd | 674 | for_each_available_child_of_node(opp_table->np, np) { |
deac8703 DG |
675 | opp = _opp_add_static_v2(opp_table, dev, np); |
676 | if (IS_ERR(opp)) { | |
677 | ret = PTR_ERR(opp); | |
f47b72a1 VK |
678 | dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, |
679 | ret); | |
7978db34 | 680 | of_node_put(np); |
ba003319 | 681 | goto put_list_kref; |
deac8703 DG |
682 | } else if (opp) { |
683 | count++; | |
f47b72a1 VK |
684 | } |
685 | } | |
686 | ||
687 | /* There should be one of more OPP defined */ | |
ba003319 VK |
688 | if (WARN_ON(!count)) { |
689 | ret = -ENOENT; | |
690 | goto put_list_kref; | |
691 | } | |
f47b72a1 | 692 | |
3ba98324 VK |
693 | list_for_each_entry(opp, &opp_table->opp_list, node) |
694 | pstate_count += !!opp->pstate; | |
695 | ||
696 | /* Either all or none of the nodes shall have performance state set */ | |
697 | if (pstate_count && pstate_count != count) { | |
698 | dev_err(dev, "Not all nodes have performance state set (%d: %d)\n", | |
699 | count, pstate_count); | |
ba003319 VK |
700 | ret = -ENOENT; |
701 | goto put_list_kref; | |
3ba98324 VK |
702 | } |
703 | ||
704 | if (pstate_count) | |
705 | opp_table->genpd_performance_state = true; | |
706 | ||
f06ed90e | 707 | opp_table->parsed_static_opps = true; |
f47b72a1 | 708 | |
cdd6ed90 | 709 | return 0; |
ba003319 VK |
710 | |
711 | put_list_kref: | |
712 | _put_opp_list_kref(opp_table); | |
713 | ||
714 | return ret; | |
f47b72a1 VK |
715 | } |
716 | ||
717 | /* Initializes OPP tables based on old-deprecated bindings */ | |
5ed4cecd | 718 | static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table) |
f47b72a1 VK |
719 | { |
720 | const struct property *prop; | |
721 | const __be32 *val; | |
8cd2f6e8 | 722 | int nr, ret = 0; |
f47b72a1 VK |
723 | |
724 | prop = of_find_property(dev->of_node, "operating-points", NULL); | |
725 | if (!prop) | |
726 | return -ENODEV; | |
727 | if (!prop->value) | |
728 | return -ENODATA; | |
729 | ||
730 | /* | |
731 | * Each OPP is a set of tuples consisting of frequency and | |
732 | * voltage like <freq-kHz vol-uV>. | |
733 | */ | |
734 | nr = prop->length / sizeof(u32); | |
735 | if (nr % 2) { | |
736 | dev_err(dev, "%s: Invalid OPP table\n", __func__); | |
737 | return -EINVAL; | |
738 | } | |
739 | ||
740 | val = prop->value; | |
741 | while (nr) { | |
742 | unsigned long freq = be32_to_cpup(val++) * 1000; | |
743 | unsigned long volt = be32_to_cpup(val++); | |
744 | ||
8cd2f6e8 | 745 | ret = _opp_add_v1(opp_table, dev, freq, volt, false); |
04a86a84 VK |
746 | if (ret) { |
747 | dev_err(dev, "%s: Failed to add OPP %ld (%d)\n", | |
748 | __func__, freq, ret); | |
ba003319 | 749 | _put_opp_list_kref(opp_table); |
cdd6ed90 | 750 | return ret; |
04a86a84 | 751 | } |
f47b72a1 VK |
752 | nr -= 2; |
753 | } | |
754 | ||
8cd2f6e8 | 755 | return ret; |
f47b72a1 VK |
756 | } |
757 | ||
758 | /** | |
759 | * dev_pm_opp_of_add_table() - Initialize opp table from device tree | |
760 | * @dev: device pointer used to lookup OPP table. | |
761 | * | |
762 | * Register the initial OPP table with the OPP library for given device. | |
763 | * | |
f47b72a1 VK |
764 | * Return: |
765 | * 0 On success OR | |
766 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
767 | * -EEXIST Freq are same and volt are different OR | |
768 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
769 | * -ENOMEM Memory allocation failure | |
770 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
771 | * in device node. | |
772 | * -ENODATA when empty 'operating-points' property is found | |
773 | * -EINVAL when invalid entries are found in opp-v2 table | |
774 | */ | |
775 | int dev_pm_opp_of_add_table(struct device *dev) | |
776 | { | |
5ed4cecd | 777 | struct opp_table *opp_table; |
f47b72a1 VK |
778 | int ret; |
779 | ||
5ed4cecd VK |
780 | opp_table = dev_pm_opp_get_opp_table_indexed(dev, 0); |
781 | if (!opp_table) | |
782 | return -ENOMEM; | |
783 | ||
f47b72a1 | 784 | /* |
5ed4cecd VK |
785 | * OPPs have two version of bindings now. Also try the old (v1) |
786 | * bindings for backward compatibility with older dtbs. | |
f47b72a1 | 787 | */ |
5ed4cecd VK |
788 | if (opp_table->np) |
789 | ret = _of_add_opp_table_v2(dev, opp_table); | |
790 | else | |
791 | ret = _of_add_opp_table_v1(dev, opp_table); | |
f47b72a1 | 792 | |
5ed4cecd VK |
793 | if (ret) |
794 | dev_pm_opp_put_opp_table(opp_table); | |
f47b72a1 VK |
795 | |
796 | return ret; | |
797 | } | |
798 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); | |
799 | ||
fa9b274f VK |
800 | /** |
801 | * dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree | |
802 | * @dev: device pointer used to lookup OPP table. | |
803 | * @index: Index number. | |
804 | * | |
805 | * Register the initial OPP table with the OPP library for given device only | |
806 | * using the "operating-points-v2" property. | |
807 | * | |
808 | * Return: | |
809 | * 0 On success OR | |
810 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
811 | * -EEXIST Freq are same and volt are different OR | |
812 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
813 | * -ENOMEM Memory allocation failure | |
814 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
815 | * in device node. | |
816 | * -ENODATA when empty 'operating-points' property is found | |
817 | * -EINVAL when invalid entries are found in opp-v2 table | |
818 | */ | |
819 | int dev_pm_opp_of_add_table_indexed(struct device *dev, int index) | |
820 | { | |
5ed4cecd | 821 | struct opp_table *opp_table; |
8a352fd8 | 822 | int ret, count; |
fa9b274f | 823 | |
5ed4cecd | 824 | if (index) { |
8a352fd8 VK |
825 | /* |
826 | * If only one phandle is present, then the same OPP table | |
827 | * applies for all index requests. | |
828 | */ | |
829 | count = of_count_phandle_with_args(dev->of_node, | |
830 | "operating-points-v2", NULL); | |
3e27c79c VK |
831 | if (count == 1) |
832 | index = 0; | |
8a352fd8 | 833 | } |
fa9b274f | 834 | |
5ed4cecd VK |
835 | opp_table = dev_pm_opp_get_opp_table_indexed(dev, index); |
836 | if (!opp_table) | |
837 | return -ENOMEM; | |
838 | ||
839 | ret = _of_add_opp_table_v2(dev, opp_table); | |
840 | if (ret) | |
841 | dev_pm_opp_put_opp_table(opp_table); | |
fa9b274f VK |
842 | |
843 | return ret; | |
844 | } | |
845 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed); | |
846 | ||
f47b72a1 VK |
847 | /* CPU device specific helpers */ |
848 | ||
849 | /** | |
850 | * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask | |
851 | * @cpumask: cpumask for which OPP table needs to be removed | |
852 | * | |
853 | * This removes the OPP tables for CPUs present in the @cpumask. | |
854 | * This should be used only to remove static entries created from DT. | |
f47b72a1 VK |
855 | */ |
856 | void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) | |
857 | { | |
2a4eb735 | 858 | _dev_pm_opp_cpumask_remove_table(cpumask, -1); |
f47b72a1 VK |
859 | } |
860 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); | |
861 | ||
862 | /** | |
863 | * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask | |
864 | * @cpumask: cpumask for which OPP table needs to be added. | |
865 | * | |
866 | * This adds the OPP tables for CPUs present in the @cpumask. | |
f47b72a1 VK |
867 | */ |
868 | int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) | |
869 | { | |
870 | struct device *cpu_dev; | |
50b6b87c | 871 | int cpu, ret; |
f47b72a1 | 872 | |
50b6b87c VK |
873 | if (WARN_ON(cpumask_empty(cpumask))) |
874 | return -ENODEV; | |
f47b72a1 VK |
875 | |
876 | for_each_cpu(cpu, cpumask) { | |
877 | cpu_dev = get_cpu_device(cpu); | |
878 | if (!cpu_dev) { | |
879 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
880 | cpu); | |
50b6b87c VK |
881 | ret = -ENODEV; |
882 | goto remove_table; | |
f47b72a1 VK |
883 | } |
884 | ||
885 | ret = dev_pm_opp_of_add_table(cpu_dev); | |
886 | if (ret) { | |
5b60697c VK |
887 | /* |
888 | * OPP may get registered dynamically, don't print error | |
889 | * message here. | |
890 | */ | |
891 | pr_debug("%s: couldn't find opp table for cpu:%d, %d\n", | |
892 | __func__, cpu, ret); | |
f47b72a1 | 893 | |
50b6b87c | 894 | goto remove_table; |
f47b72a1 VK |
895 | } |
896 | } | |
897 | ||
50b6b87c VK |
898 | return 0; |
899 | ||
900 | remove_table: | |
901 | /* Free all other OPPs */ | |
902 | _dev_pm_opp_cpumask_remove_table(cpumask, cpu); | |
903 | ||
f47b72a1 VK |
904 | return ret; |
905 | } | |
906 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); | |
907 | ||
908 | /* | |
909 | * Works only for OPP v2 bindings. | |
910 | * | |
911 | * Returns -ENOENT if operating-points-v2 bindings aren't supported. | |
912 | */ | |
913 | /** | |
914 | * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with | |
915 | * @cpu_dev using operating-points-v2 | |
916 | * bindings. | |
917 | * | |
918 | * @cpu_dev: CPU device for which we do this operation | |
919 | * @cpumask: cpumask to update with information of sharing CPUs | |
920 | * | |
921 | * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. | |
922 | * | |
923 | * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. | |
f47b72a1 VK |
924 | */ |
925 | int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, | |
926 | struct cpumask *cpumask) | |
927 | { | |
76279291 | 928 | struct device_node *np, *tmp_np, *cpu_np; |
f47b72a1 VK |
929 | int cpu, ret = 0; |
930 | ||
931 | /* Get OPP descriptor node */ | |
0764c604 | 932 | np = dev_pm_opp_of_get_opp_desc_node(cpu_dev); |
f47b72a1 | 933 | if (!np) { |
349aa92e | 934 | dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__); |
f47b72a1 VK |
935 | return -ENOENT; |
936 | } | |
937 | ||
938 | cpumask_set_cpu(cpu_dev->id, cpumask); | |
939 | ||
940 | /* OPPs are shared ? */ | |
941 | if (!of_property_read_bool(np, "opp-shared")) | |
942 | goto put_cpu_node; | |
943 | ||
944 | for_each_possible_cpu(cpu) { | |
945 | if (cpu == cpu_dev->id) | |
946 | continue; | |
947 | ||
9867999f | 948 | cpu_np = of_cpu_device_node_get(cpu); |
76279291 WR |
949 | if (!cpu_np) { |
950 | dev_err(cpu_dev, "%s: failed to get cpu%d node\n", | |
f47b72a1 | 951 | __func__, cpu); |
76279291 | 952 | ret = -ENOENT; |
f47b72a1 VK |
953 | goto put_cpu_node; |
954 | } | |
955 | ||
956 | /* Get OPP descriptor node */ | |
fa9b274f | 957 | tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0); |
9867999f | 958 | of_node_put(cpu_np); |
f47b72a1 | 959 | if (!tmp_np) { |
76279291 | 960 | pr_err("%pOF: Couldn't find opp node\n", cpu_np); |
f47b72a1 VK |
961 | ret = -ENOENT; |
962 | goto put_cpu_node; | |
963 | } | |
964 | ||
965 | /* CPUs are sharing opp node */ | |
966 | if (np == tmp_np) | |
967 | cpumask_set_cpu(cpu, cpumask); | |
968 | ||
969 | of_node_put(tmp_np); | |
970 | } | |
971 | ||
972 | put_cpu_node: | |
973 | of_node_put(np); | |
974 | return ret; | |
975 | } | |
976 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); | |
a88bd2a5 VK |
977 | |
978 | /** | |
4c6a343e | 979 | * of_get_required_opp_performance_state() - Search for required OPP and return its performance state. |
a88bd2a5 | 980 | * @np: Node that contains the "required-opps" property. |
4c6a343e | 981 | * @index: Index of the phandle to parse. |
a88bd2a5 | 982 | * |
4c6a343e VK |
983 | * Returns the performance state of the OPP pointed out by the "required-opps" |
984 | * property at @index in @np. | |
a88bd2a5 | 985 | * |
2feb5a89 VK |
986 | * Return: Zero or positive performance state on success, otherwise negative |
987 | * value on errors. | |
a88bd2a5 | 988 | */ |
2feb5a89 | 989 | int of_get_required_opp_performance_state(struct device_node *np, int index) |
a88bd2a5 | 990 | { |
4c6a343e | 991 | struct dev_pm_opp *opp; |
a88bd2a5 VK |
992 | struct device_node *required_np; |
993 | struct opp_table *opp_table; | |
2feb5a89 | 994 | int pstate = -EINVAL; |
a88bd2a5 | 995 | |
4c6a343e VK |
996 | required_np = of_parse_required_opp(np, index); |
997 | if (!required_np) | |
2feb5a89 | 998 | return -EINVAL; |
a88bd2a5 | 999 | |
4c6a343e VK |
1000 | opp_table = _find_table_of_opp_np(required_np); |
1001 | if (IS_ERR(opp_table)) { | |
1002 | pr_err("%s: Failed to find required OPP table %pOF: %ld\n", | |
1003 | __func__, np, PTR_ERR(opp_table)); | |
1004 | goto put_required_np; | |
a88bd2a5 VK |
1005 | } |
1006 | ||
4c6a343e VK |
1007 | opp = _find_opp_of_np(opp_table, required_np); |
1008 | if (opp) { | |
1009 | pstate = opp->pstate; | |
1010 | dev_pm_opp_put(opp); | |
a88bd2a5 VK |
1011 | } |
1012 | ||
4c6a343e | 1013 | dev_pm_opp_put_opp_table(opp_table); |
a88bd2a5 | 1014 | |
4c6a343e | 1015 | put_required_np: |
a88bd2a5 | 1016 | of_node_put(required_np); |
a88bd2a5 | 1017 | |
4c6a343e | 1018 | return pstate; |
a88bd2a5 | 1019 | } |
4c6a343e | 1020 | EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state); |
e2f4b5f8 VK |
1021 | |
1022 | /** | |
1023 | * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp | |
1024 | * @opp: opp for which DT node has to be returned for | |
1025 | * | |
1026 | * Return: DT node corresponding to the opp, else 0 on success. | |
1027 | * | |
1028 | * The caller needs to put the node with of_node_put() after using it. | |
1029 | */ | |
1030 | struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp) | |
1031 | { | |
1032 | if (IS_ERR_OR_NULL(opp)) { | |
1033 | pr_err("%s: Invalid parameters\n", __func__); | |
1034 | return NULL; | |
1035 | } | |
1036 | ||
1037 | return of_node_get(opp->np); | |
1038 | } | |
1039 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node); | |
a4f342b9 QP |
1040 | |
1041 | /* | |
1042 | * Callback function provided to the Energy Model framework upon registration. | |
1043 | * This computes the power estimated by @CPU at @kHz if it is the frequency | |
1044 | * of an existing OPP, or at the frequency of the first OPP above @kHz otherwise | |
1045 | * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled | |
1046 | * frequency and @mW to the associated power. The power is estimated as | |
1047 | * P = C * V^2 * f with C being the CPU's capacitance and V and f respectively | |
1048 | * the voltage and frequency of the OPP. | |
1049 | * | |
1050 | * Returns -ENODEV if the CPU device cannot be found, -EINVAL if the power | |
1051 | * calculation failed because of missing parameters, 0 otherwise. | |
1052 | */ | |
1053 | static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz, | |
1054 | int cpu) | |
1055 | { | |
1056 | struct device *cpu_dev; | |
1057 | struct dev_pm_opp *opp; | |
1058 | struct device_node *np; | |
1059 | unsigned long mV, Hz; | |
1060 | u32 cap; | |
1061 | u64 tmp; | |
1062 | int ret; | |
1063 | ||
1064 | cpu_dev = get_cpu_device(cpu); | |
1065 | if (!cpu_dev) | |
1066 | return -ENODEV; | |
1067 | ||
1068 | np = of_node_get(cpu_dev->of_node); | |
1069 | if (!np) | |
1070 | return -EINVAL; | |
1071 | ||
1072 | ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap); | |
1073 | of_node_put(np); | |
1074 | if (ret) | |
1075 | return -EINVAL; | |
1076 | ||
1077 | Hz = *kHz * 1000; | |
1078 | opp = dev_pm_opp_find_freq_ceil(cpu_dev, &Hz); | |
1079 | if (IS_ERR(opp)) | |
1080 | return -EINVAL; | |
1081 | ||
1082 | mV = dev_pm_opp_get_voltage(opp) / 1000; | |
1083 | dev_pm_opp_put(opp); | |
1084 | if (!mV) | |
1085 | return -EINVAL; | |
1086 | ||
1087 | tmp = (u64)cap * mV * mV * (Hz / 1000000); | |
1088 | do_div(tmp, 1000000000); | |
1089 | ||
1090 | *mW = (unsigned long)tmp; | |
1091 | *kHz = Hz / 1000; | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | /** | |
1097 | * dev_pm_opp_of_register_em() - Attempt to register an Energy Model | |
1098 | * @cpus : CPUs for which an Energy Model has to be registered | |
1099 | * | |
1100 | * This checks whether the "dynamic-power-coefficient" devicetree property has | |
1101 | * been specified, and tries to register an Energy Model with it if it has. | |
1102 | */ | |
1103 | void dev_pm_opp_of_register_em(struct cpumask *cpus) | |
1104 | { | |
1105 | struct em_data_callback em_cb = EM_DATA_CB(_get_cpu_power); | |
1106 | int ret, nr_opp, cpu = cpumask_first(cpus); | |
1107 | struct device *cpu_dev; | |
1108 | struct device_node *np; | |
1109 | u32 cap; | |
1110 | ||
1111 | cpu_dev = get_cpu_device(cpu); | |
1112 | if (!cpu_dev) | |
1113 | return; | |
1114 | ||
1115 | nr_opp = dev_pm_opp_get_opp_count(cpu_dev); | |
1116 | if (nr_opp <= 0) | |
1117 | return; | |
1118 | ||
1119 | np = of_node_get(cpu_dev->of_node); | |
1120 | if (!np) | |
1121 | return; | |
1122 | ||
1123 | /* | |
1124 | * Register an EM only if the 'dynamic-power-coefficient' property is | |
1125 | * set in devicetree. It is assumed the voltage values are known if that | |
1126 | * property is set since it is useless otherwise. If voltages are not | |
1127 | * known, just let the EM registration fail with an error to alert the | |
1128 | * user about the inconsistent configuration. | |
1129 | */ | |
1130 | ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap); | |
1131 | of_node_put(np); | |
1132 | if (ret || !cap) | |
1133 | return; | |
1134 | ||
1135 | em_register_perf_domain(cpus, nr_opp, &em_cb); | |
1136 | } | |
1137 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em); |