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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 | ||
6d3f922c GD |
335 | int dev_pm_opp_of_find_icc_paths(struct device *dev, |
336 | struct opp_table *opp_table) | |
337 | { | |
338 | struct device_node *np; | |
339 | int ret = 0, i, count, num_paths; | |
340 | struct icc_path **paths; | |
341 | ||
342 | np = of_node_get(dev->of_node); | |
343 | if (!np) | |
344 | return 0; | |
345 | ||
346 | count = of_count_phandle_with_args(np, "interconnects", | |
347 | "#interconnect-cells"); | |
348 | of_node_put(np); | |
349 | if (count < 0) | |
350 | return 0; | |
351 | ||
352 | /* two phandles when #interconnect-cells = <1> */ | |
353 | if (count % 2) { | |
354 | dev_err(dev, "%s: Invalid interconnects values\n", __func__); | |
355 | return -EINVAL; | |
356 | } | |
357 | ||
358 | num_paths = count / 2; | |
359 | paths = kcalloc(num_paths, sizeof(*paths), GFP_KERNEL); | |
360 | if (!paths) | |
361 | return -ENOMEM; | |
362 | ||
363 | for (i = 0; i < num_paths; i++) { | |
364 | paths[i] = of_icc_get_by_index(dev, i); | |
365 | if (IS_ERR(paths[i])) { | |
366 | ret = PTR_ERR(paths[i]); | |
367 | if (ret != -EPROBE_DEFER) { | |
368 | dev_err(dev, "%s: Unable to get path%d: %d\n", | |
369 | __func__, i, ret); | |
370 | } | |
371 | goto err; | |
372 | } | |
373 | } | |
374 | ||
375 | if (opp_table) { | |
376 | opp_table->paths = paths; | |
377 | opp_table->path_count = num_paths; | |
378 | return 0; | |
379 | } | |
380 | ||
381 | err: | |
382 | while (i--) | |
383 | icc_put(paths[i]); | |
384 | ||
385 | kfree(paths); | |
386 | ||
387 | return ret; | |
388 | } | |
389 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_find_icc_paths); | |
390 | ||
f47b72a1 VK |
391 | static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, |
392 | struct device_node *np) | |
393 | { | |
394 | unsigned int count = opp_table->supported_hw_count; | |
395 | u32 version; | |
396 | int ret; | |
397 | ||
a4ee4545 DG |
398 | if (!opp_table->supported_hw) { |
399 | /* | |
400 | * In the case that no supported_hw has been set by the | |
401 | * platform but there is an opp-supported-hw value set for | |
402 | * an OPP then the OPP should not be enabled as there is | |
403 | * no way to see if the hardware supports it. | |
404 | */ | |
405 | if (of_find_property(np, "opp-supported-hw", NULL)) | |
406 | return false; | |
407 | else | |
408 | return true; | |
409 | } | |
f47b72a1 VK |
410 | |
411 | while (count--) { | |
412 | ret = of_property_read_u32_index(np, "opp-supported-hw", count, | |
413 | &version); | |
414 | if (ret) { | |
415 | dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", | |
416 | __func__, count, ret); | |
417 | return false; | |
418 | } | |
419 | ||
420 | /* Both of these are bitwise masks of the versions */ | |
421 | if (!(version & opp_table->supported_hw[count])) | |
422 | return false; | |
423 | } | |
424 | ||
425 | return true; | |
426 | } | |
427 | ||
f47b72a1 VK |
428 | static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, |
429 | struct opp_table *opp_table) | |
430 | { | |
dfbe4678 | 431 | u32 *microvolt, *microamp = NULL; |
46f48aca | 432 | int supplies = opp_table->regulator_count, vcount, icount, ret, i, j; |
f47b72a1 VK |
433 | struct property *prop = NULL; |
434 | char name[NAME_MAX]; | |
435 | ||
436 | /* Search for "opp-microvolt-<name>" */ | |
437 | if (opp_table->prop_name) { | |
438 | snprintf(name, sizeof(name), "opp-microvolt-%s", | |
439 | opp_table->prop_name); | |
440 | prop = of_find_property(opp->np, name, NULL); | |
441 | } | |
442 | ||
443 | if (!prop) { | |
444 | /* Search for "opp-microvolt" */ | |
445 | sprintf(name, "opp-microvolt"); | |
446 | prop = of_find_property(opp->np, name, NULL); | |
447 | ||
448 | /* Missing property isn't a problem, but an invalid entry is */ | |
688a48b0 | 449 | if (!prop) { |
46f48aca VK |
450 | if (unlikely(supplies == -1)) { |
451 | /* Initialize regulator_count */ | |
452 | opp_table->regulator_count = 0; | |
453 | return 0; | |
454 | } | |
455 | ||
456 | if (!supplies) | |
688a48b0 VK |
457 | return 0; |
458 | ||
459 | dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n", | |
460 | __func__); | |
461 | return -EINVAL; | |
462 | } | |
f47b72a1 VK |
463 | } |
464 | ||
46f48aca VK |
465 | if (unlikely(supplies == -1)) { |
466 | /* Initialize regulator_count */ | |
467 | supplies = opp_table->regulator_count = 1; | |
468 | } else if (unlikely(!supplies)) { | |
469 | dev_err(dev, "%s: opp-microvolt wasn't expected\n", __func__); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
dfbe4678 VK |
473 | vcount = of_property_count_u32_elems(opp->np, name); |
474 | if (vcount < 0) { | |
f47b72a1 | 475 | dev_err(dev, "%s: Invalid %s property (%d)\n", |
dfbe4678 VK |
476 | __func__, name, vcount); |
477 | return vcount; | |
f47b72a1 VK |
478 | } |
479 | ||
dfbe4678 VK |
480 | /* There can be one or three elements per supply */ |
481 | if (vcount != supplies && vcount != supplies * 3) { | |
482 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
483 | __func__, name, vcount, supplies); | |
f47b72a1 VK |
484 | return -EINVAL; |
485 | } | |
486 | ||
dfbe4678 VK |
487 | microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); |
488 | if (!microvolt) | |
489 | return -ENOMEM; | |
490 | ||
491 | ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); | |
f47b72a1 VK |
492 | if (ret) { |
493 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); | |
dfbe4678 VK |
494 | ret = -EINVAL; |
495 | goto free_microvolt; | |
f47b72a1 VK |
496 | } |
497 | ||
498 | /* Search for "opp-microamp-<name>" */ | |
499 | prop = NULL; | |
500 | if (opp_table->prop_name) { | |
501 | snprintf(name, sizeof(name), "opp-microamp-%s", | |
502 | opp_table->prop_name); | |
503 | prop = of_find_property(opp->np, name, NULL); | |
504 | } | |
505 | ||
506 | if (!prop) { | |
507 | /* Search for "opp-microamp" */ | |
508 | sprintf(name, "opp-microamp"); | |
509 | prop = of_find_property(opp->np, name, NULL); | |
510 | } | |
511 | ||
dfbe4678 VK |
512 | if (prop) { |
513 | icount = of_property_count_u32_elems(opp->np, name); | |
514 | if (icount < 0) { | |
515 | dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, | |
516 | name, icount); | |
517 | ret = icount; | |
518 | goto free_microvolt; | |
519 | } | |
f47b72a1 | 520 | |
dfbe4678 VK |
521 | if (icount != supplies) { |
522 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
523 | __func__, name, icount, supplies); | |
524 | ret = -EINVAL; | |
525 | goto free_microvolt; | |
526 | } | |
527 | ||
528 | microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); | |
529 | if (!microamp) { | |
530 | ret = -EINVAL; | |
531 | goto free_microvolt; | |
532 | } | |
533 | ||
534 | ret = of_property_read_u32_array(opp->np, name, microamp, | |
535 | icount); | |
536 | if (ret) { | |
537 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, | |
538 | name, ret); | |
539 | ret = -EINVAL; | |
540 | goto free_microamp; | |
541 | } | |
542 | } | |
543 | ||
544 | for (i = 0, j = 0; i < supplies; i++) { | |
545 | opp->supplies[i].u_volt = microvolt[j++]; | |
546 | ||
547 | if (vcount == supplies) { | |
548 | opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; | |
549 | opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; | |
550 | } else { | |
551 | opp->supplies[i].u_volt_min = microvolt[j++]; | |
552 | opp->supplies[i].u_volt_max = microvolt[j++]; | |
553 | } | |
554 | ||
555 | if (microamp) | |
556 | opp->supplies[i].u_amp = microamp[i]; | |
557 | } | |
558 | ||
559 | free_microamp: | |
560 | kfree(microamp); | |
561 | free_microvolt: | |
562 | kfree(microvolt); | |
563 | ||
564 | return ret; | |
f47b72a1 VK |
565 | } |
566 | ||
567 | /** | |
568 | * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT | |
569 | * entries | |
570 | * @dev: device pointer used to lookup OPP table. | |
571 | * | |
572 | * Free OPPs created using static entries present in DT. | |
f47b72a1 VK |
573 | */ |
574 | void dev_pm_opp_of_remove_table(struct device *dev) | |
575 | { | |
2a4eb735 | 576 | _dev_pm_opp_find_and_remove_table(dev); |
f47b72a1 VK |
577 | } |
578 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); | |
579 | ||
120e117b GD |
580 | static int _read_bw(struct dev_pm_opp *new_opp, struct opp_table *table, |
581 | struct device_node *np, bool peak) | |
6d3f922c GD |
582 | { |
583 | const char *name = peak ? "opp-peak-kBps" : "opp-avg-kBps"; | |
584 | struct property *prop; | |
585 | int i, count, ret; | |
586 | u32 *bw; | |
587 | ||
588 | prop = of_find_property(np, name, NULL); | |
589 | if (!prop) | |
590 | return -ENODEV; | |
591 | ||
592 | count = prop->length / sizeof(u32); | |
120e117b GD |
593 | if (table->path_count != count) { |
594 | pr_err("%s: Mismatch between %s and paths (%d %d)\n", | |
595 | __func__, name, count, table->path_count); | |
596 | return -EINVAL; | |
597 | } | |
598 | ||
6d3f922c GD |
599 | bw = kmalloc_array(count, sizeof(*bw), GFP_KERNEL); |
600 | if (!bw) | |
601 | return -ENOMEM; | |
602 | ||
603 | ret = of_property_read_u32_array(np, name, bw, count); | |
604 | if (ret) { | |
605 | pr_err("%s: Error parsing %s: %d\n", __func__, name, ret); | |
606 | goto out; | |
607 | } | |
608 | ||
609 | for (i = 0; i < count; i++) { | |
610 | if (peak) | |
611 | new_opp->bandwidth[i].peak = kBps_to_icc(bw[i]); | |
612 | else | |
613 | new_opp->bandwidth[i].avg = kBps_to_icc(bw[i]); | |
614 | } | |
615 | ||
616 | out: | |
617 | kfree(bw); | |
618 | return ret; | |
619 | } | |
620 | ||
120e117b GD |
621 | static int _read_opp_key(struct dev_pm_opp *new_opp, struct opp_table *table, |
622 | struct device_node *np, bool *rate_not_available) | |
6c591eec | 623 | { |
6d3f922c | 624 | bool found = false; |
6c591eec SK |
625 | u64 rate; |
626 | int ret; | |
627 | ||
628 | ret = of_property_read_u64(np, "opp-hz", &rate); | |
629 | if (!ret) { | |
630 | /* | |
631 | * Rate is defined as an unsigned long in clk API, and so | |
632 | * casting explicitly to its type. Must be fixed once rate is 64 | |
633 | * bit guaranteed in clk API. | |
634 | */ | |
635 | new_opp->rate = (unsigned long)rate; | |
6d3f922c | 636 | found = true; |
6c591eec SK |
637 | } |
638 | *rate_not_available = !!ret; | |
639 | ||
6d3f922c GD |
640 | /* |
641 | * Bandwidth consists of peak and average (optional) values: | |
642 | * opp-peak-kBps = <path1_value path2_value>; | |
643 | * opp-avg-kBps = <path1_value path2_value>; | |
644 | */ | |
120e117b | 645 | ret = _read_bw(new_opp, table, np, true); |
6d3f922c GD |
646 | if (!ret) { |
647 | found = true; | |
120e117b | 648 | ret = _read_bw(new_opp, table, np, false); |
6d3f922c GD |
649 | } |
650 | ||
651 | /* The properties were found but we failed to parse them */ | |
652 | if (ret && ret != -ENODEV) | |
653 | return ret; | |
654 | ||
655 | if (!of_property_read_u32(np, "opp-level", &new_opp->level)) | |
656 | found = true; | |
657 | ||
658 | if (found) | |
659 | return 0; | |
6c591eec SK |
660 | |
661 | return ret; | |
662 | } | |
663 | ||
f47b72a1 VK |
664 | /** |
665 | * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) | |
8cd2f6e8 | 666 | * @opp_table: OPP table |
f47b72a1 VK |
667 | * @dev: device for which we do this operation |
668 | * @np: device node | |
669 | * | |
670 | * This function adds an opp definition to the opp table and returns status. The | |
671 | * opp can be controlled using dev_pm_opp_enable/disable functions and may be | |
672 | * removed by dev_pm_opp_remove. | |
673 | * | |
f47b72a1 | 674 | * Return: |
deac8703 DG |
675 | * Valid OPP pointer: |
676 | * On success | |
677 | * NULL: | |
f47b72a1 | 678 | * Duplicate OPPs (both freq and volt are same) and opp->available |
deac8703 DG |
679 | * OR if the OPP is not supported by hardware. |
680 | * ERR_PTR(-EEXIST): | |
681 | * Freq are same and volt are different OR | |
f47b72a1 | 682 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
deac8703 DG |
683 | * ERR_PTR(-ENOMEM): |
684 | * Memory allocation failure | |
685 | * ERR_PTR(-EINVAL): | |
686 | * Failed parsing the OPP node | |
f47b72a1 | 687 | */ |
deac8703 DG |
688 | static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table, |
689 | struct device *dev, struct device_node *np) | |
f47b72a1 | 690 | { |
f47b72a1 | 691 | struct dev_pm_opp *new_opp; |
6a89e012 | 692 | u64 rate = 0; |
f47b72a1 VK |
693 | u32 val; |
694 | int ret; | |
a1e8c136 | 695 | bool rate_not_available = false; |
f47b72a1 | 696 | |
8cd2f6e8 VK |
697 | new_opp = _opp_allocate(opp_table); |
698 | if (!new_opp) | |
deac8703 | 699 | return ERR_PTR(-ENOMEM); |
f47b72a1 | 700 | |
120e117b | 701 | ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available); |
6c591eec SK |
702 | if (ret < 0 && !opp_table->is_genpd) { |
703 | dev_err(dev, "%s: opp key field not found\n", __func__); | |
704 | goto free_opp; | |
f47b72a1 VK |
705 | } |
706 | ||
707 | /* Check if the OPP supports hardware's hierarchy of versions or not */ | |
708 | if (!_opp_is_supported(dev, opp_table, np)) { | |
709 | dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); | |
710 | goto free_opp; | |
711 | } | |
712 | ||
f47b72a1 VK |
713 | new_opp->turbo = of_property_read_bool(np, "turbo-mode"); |
714 | ||
715 | new_opp->np = np; | |
716 | new_opp->dynamic = false; | |
717 | new_opp->available = true; | |
718 | ||
da544b61 VK |
719 | ret = _of_opp_alloc_required_opps(opp_table, new_opp); |
720 | if (ret) | |
721 | goto free_opp; | |
722 | ||
f47b72a1 VK |
723 | if (!of_property_read_u32(np, "clock-latency-ns", &val)) |
724 | new_opp->clock_latency_ns = val; | |
725 | ||
726 | ret = opp_parse_supplies(new_opp, dev, opp_table); | |
727 | if (ret) | |
da544b61 | 728 | goto free_required_opps; |
f47b72a1 | 729 | |
ca1b5d77 VK |
730 | if (opp_table->is_genpd) |
731 | new_opp->pstate = pm_genpd_opp_to_performance_state(dev, new_opp); | |
f47b72a1 | 732 | |
a1e8c136 | 733 | ret = _opp_add(dev, new_opp, opp_table, rate_not_available); |
7f8538eb VK |
734 | if (ret) { |
735 | /* Don't return error for duplicate OPPs */ | |
736 | if (ret == -EBUSY) | |
737 | ret = 0; | |
da544b61 | 738 | goto free_required_opps; |
7f8538eb | 739 | } |
f47b72a1 VK |
740 | |
741 | /* OPP to select on device suspend */ | |
742 | if (of_property_read_bool(np, "opp-suspend")) { | |
743 | if (opp_table->suspend_opp) { | |
45275517 AH |
744 | /* Pick the OPP with higher rate as suspend OPP */ |
745 | if (new_opp->rate > opp_table->suspend_opp->rate) { | |
746 | opp_table->suspend_opp->suspend = false; | |
747 | new_opp->suspend = true; | |
748 | opp_table->suspend_opp = new_opp; | |
749 | } | |
f47b72a1 VK |
750 | } else { |
751 | new_opp->suspend = true; | |
752 | opp_table->suspend_opp = new_opp; | |
753 | } | |
754 | } | |
755 | ||
756 | if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) | |
757 | opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; | |
758 | ||
f47b72a1 | 759 | pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", |
0f0fe7e0 | 760 | __func__, new_opp->turbo, new_opp->rate, |
dfbe4678 VK |
761 | new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, |
762 | new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns); | |
f47b72a1 VK |
763 | |
764 | /* | |
765 | * Notify the changes in the availability of the operable | |
766 | * frequency/voltage list. | |
767 | */ | |
052c6f19 | 768 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
deac8703 | 769 | return new_opp; |
f47b72a1 | 770 | |
da544b61 VK |
771 | free_required_opps: |
772 | _of_opp_free_required_opps(opp_table, new_opp); | |
f47b72a1 | 773 | free_opp: |
8cd2f6e8 VK |
774 | _opp_free(new_opp); |
775 | ||
deac8703 | 776 | return ERR_PTR(ret); |
f47b72a1 VK |
777 | } |
778 | ||
779 | /* Initializes OPP tables based on new bindings */ | |
5ed4cecd | 780 | static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table) |
f47b72a1 VK |
781 | { |
782 | struct device_node *np; | |
283d55e6 | 783 | int ret, count = 0, pstate_count = 0; |
3ba98324 | 784 | struct dev_pm_opp *opp; |
f47b72a1 | 785 | |
283d55e6 | 786 | /* OPP table is already initialized for the device */ |
03758d60 | 787 | mutex_lock(&opp_table->lock); |
283d55e6 | 788 | if (opp_table->parsed_static_opps) { |
03758d60 VK |
789 | opp_table->parsed_static_opps++; |
790 | mutex_unlock(&opp_table->lock); | |
283d55e6 VK |
791 | return 0; |
792 | } | |
793 | ||
03758d60 VK |
794 | opp_table->parsed_static_opps = 1; |
795 | mutex_unlock(&opp_table->lock); | |
b19c2355 | 796 | |
f47b72a1 | 797 | /* We have opp-table node now, iterate over it and add OPPs */ |
5ed4cecd | 798 | for_each_available_child_of_node(opp_table->np, np) { |
deac8703 DG |
799 | opp = _opp_add_static_v2(opp_table, dev, np); |
800 | if (IS_ERR(opp)) { | |
801 | ret = PTR_ERR(opp); | |
f47b72a1 VK |
802 | dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, |
803 | ret); | |
7978db34 | 804 | of_node_put(np); |
03758d60 | 805 | goto remove_static_opp; |
deac8703 DG |
806 | } else if (opp) { |
807 | count++; | |
f47b72a1 VK |
808 | } |
809 | } | |
810 | ||
811 | /* There should be one of more OPP defined */ | |
ba003319 VK |
812 | if (WARN_ON(!count)) { |
813 | ret = -ENOENT; | |
03758d60 | 814 | goto remove_static_opp; |
ba003319 | 815 | } |
f47b72a1 | 816 | |
3ba98324 VK |
817 | list_for_each_entry(opp, &opp_table->opp_list, node) |
818 | pstate_count += !!opp->pstate; | |
819 | ||
820 | /* Either all or none of the nodes shall have performance state set */ | |
821 | if (pstate_count && pstate_count != count) { | |
822 | dev_err(dev, "Not all nodes have performance state set (%d: %d)\n", | |
823 | count, pstate_count); | |
ba003319 | 824 | ret = -ENOENT; |
03758d60 | 825 | goto remove_static_opp; |
3ba98324 VK |
826 | } |
827 | ||
828 | if (pstate_count) | |
829 | opp_table->genpd_performance_state = true; | |
830 | ||
cdd6ed90 | 831 | return 0; |
ba003319 | 832 | |
03758d60 VK |
833 | remove_static_opp: |
834 | _opp_remove_all_static(opp_table); | |
ba003319 VK |
835 | |
836 | return ret; | |
f47b72a1 VK |
837 | } |
838 | ||
839 | /* Initializes OPP tables based on old-deprecated bindings */ | |
5ed4cecd | 840 | static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table) |
f47b72a1 VK |
841 | { |
842 | const struct property *prop; | |
843 | const __be32 *val; | |
8cd2f6e8 | 844 | int nr, ret = 0; |
f47b72a1 VK |
845 | |
846 | prop = of_find_property(dev->of_node, "operating-points", NULL); | |
847 | if (!prop) | |
848 | return -ENODEV; | |
849 | if (!prop->value) | |
850 | return -ENODATA; | |
851 | ||
852 | /* | |
853 | * Each OPP is a set of tuples consisting of frequency and | |
854 | * voltage like <freq-kHz vol-uV>. | |
855 | */ | |
856 | nr = prop->length / sizeof(u32); | |
857 | if (nr % 2) { | |
858 | dev_err(dev, "%s: Invalid OPP table\n", __func__); | |
859 | return -EINVAL; | |
860 | } | |
861 | ||
862 | val = prop->value; | |
863 | while (nr) { | |
864 | unsigned long freq = be32_to_cpup(val++) * 1000; | |
865 | unsigned long volt = be32_to_cpup(val++); | |
866 | ||
8cd2f6e8 | 867 | ret = _opp_add_v1(opp_table, dev, freq, volt, false); |
04a86a84 VK |
868 | if (ret) { |
869 | dev_err(dev, "%s: Failed to add OPP %ld (%d)\n", | |
870 | __func__, freq, ret); | |
03758d60 | 871 | _opp_remove_all_static(opp_table); |
cdd6ed90 | 872 | return ret; |
04a86a84 | 873 | } |
f47b72a1 VK |
874 | nr -= 2; |
875 | } | |
876 | ||
8cd2f6e8 | 877 | return ret; |
f47b72a1 VK |
878 | } |
879 | ||
880 | /** | |
881 | * dev_pm_opp_of_add_table() - Initialize opp table from device tree | |
882 | * @dev: device pointer used to lookup OPP table. | |
883 | * | |
884 | * Register the initial OPP table with the OPP library for given device. | |
885 | * | |
f47b72a1 VK |
886 | * Return: |
887 | * 0 On success OR | |
888 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
889 | * -EEXIST Freq are same and volt are different OR | |
890 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
891 | * -ENOMEM Memory allocation failure | |
892 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
893 | * in device node. | |
894 | * -ENODATA when empty 'operating-points' property is found | |
895 | * -EINVAL when invalid entries are found in opp-v2 table | |
896 | */ | |
897 | int dev_pm_opp_of_add_table(struct device *dev) | |
898 | { | |
5ed4cecd | 899 | struct opp_table *opp_table; |
f47b72a1 VK |
900 | int ret; |
901 | ||
5ed4cecd VK |
902 | opp_table = dev_pm_opp_get_opp_table_indexed(dev, 0); |
903 | if (!opp_table) | |
904 | return -ENOMEM; | |
905 | ||
f47b72a1 | 906 | /* |
5ed4cecd VK |
907 | * OPPs have two version of bindings now. Also try the old (v1) |
908 | * bindings for backward compatibility with older dtbs. | |
f47b72a1 | 909 | */ |
5ed4cecd VK |
910 | if (opp_table->np) |
911 | ret = _of_add_opp_table_v2(dev, opp_table); | |
912 | else | |
913 | ret = _of_add_opp_table_v1(dev, opp_table); | |
f47b72a1 | 914 | |
5ed4cecd VK |
915 | if (ret) |
916 | dev_pm_opp_put_opp_table(opp_table); | |
f47b72a1 VK |
917 | |
918 | return ret; | |
919 | } | |
920 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); | |
921 | ||
fa9b274f VK |
922 | /** |
923 | * dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree | |
924 | * @dev: device pointer used to lookup OPP table. | |
925 | * @index: Index number. | |
926 | * | |
927 | * Register the initial OPP table with the OPP library for given device only | |
928 | * using the "operating-points-v2" property. | |
929 | * | |
930 | * Return: | |
931 | * 0 On success OR | |
932 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
933 | * -EEXIST Freq are same and volt are different OR | |
934 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
935 | * -ENOMEM Memory allocation failure | |
936 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
937 | * in device node. | |
938 | * -ENODATA when empty 'operating-points' property is found | |
939 | * -EINVAL when invalid entries are found in opp-v2 table | |
940 | */ | |
941 | int dev_pm_opp_of_add_table_indexed(struct device *dev, int index) | |
942 | { | |
5ed4cecd | 943 | struct opp_table *opp_table; |
8a352fd8 | 944 | int ret, count; |
fa9b274f | 945 | |
5ed4cecd | 946 | if (index) { |
8a352fd8 VK |
947 | /* |
948 | * If only one phandle is present, then the same OPP table | |
949 | * applies for all index requests. | |
950 | */ | |
951 | count = of_count_phandle_with_args(dev->of_node, | |
952 | "operating-points-v2", NULL); | |
3e27c79c VK |
953 | if (count == 1) |
954 | index = 0; | |
8a352fd8 | 955 | } |
fa9b274f | 956 | |
5ed4cecd VK |
957 | opp_table = dev_pm_opp_get_opp_table_indexed(dev, index); |
958 | if (!opp_table) | |
959 | return -ENOMEM; | |
960 | ||
961 | ret = _of_add_opp_table_v2(dev, opp_table); | |
962 | if (ret) | |
963 | dev_pm_opp_put_opp_table(opp_table); | |
fa9b274f VK |
964 | |
965 | return ret; | |
966 | } | |
967 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed); | |
968 | ||
f47b72a1 VK |
969 | /* CPU device specific helpers */ |
970 | ||
971 | /** | |
972 | * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask | |
973 | * @cpumask: cpumask for which OPP table needs to be removed | |
974 | * | |
975 | * This removes the OPP tables for CPUs present in the @cpumask. | |
976 | * This should be used only to remove static entries created from DT. | |
f47b72a1 VK |
977 | */ |
978 | void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) | |
979 | { | |
2a4eb735 | 980 | _dev_pm_opp_cpumask_remove_table(cpumask, -1); |
f47b72a1 VK |
981 | } |
982 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); | |
983 | ||
984 | /** | |
985 | * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask | |
986 | * @cpumask: cpumask for which OPP table needs to be added. | |
987 | * | |
988 | * This adds the OPP tables for CPUs present in the @cpumask. | |
f47b72a1 VK |
989 | */ |
990 | int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) | |
991 | { | |
992 | struct device *cpu_dev; | |
50b6b87c | 993 | int cpu, ret; |
f47b72a1 | 994 | |
50b6b87c VK |
995 | if (WARN_ON(cpumask_empty(cpumask))) |
996 | return -ENODEV; | |
f47b72a1 VK |
997 | |
998 | for_each_cpu(cpu, cpumask) { | |
999 | cpu_dev = get_cpu_device(cpu); | |
1000 | if (!cpu_dev) { | |
1001 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
1002 | cpu); | |
50b6b87c VK |
1003 | ret = -ENODEV; |
1004 | goto remove_table; | |
f47b72a1 VK |
1005 | } |
1006 | ||
1007 | ret = dev_pm_opp_of_add_table(cpu_dev); | |
1008 | if (ret) { | |
5b60697c VK |
1009 | /* |
1010 | * OPP may get registered dynamically, don't print error | |
1011 | * message here. | |
1012 | */ | |
1013 | pr_debug("%s: couldn't find opp table for cpu:%d, %d\n", | |
1014 | __func__, cpu, ret); | |
f47b72a1 | 1015 | |
50b6b87c | 1016 | goto remove_table; |
f47b72a1 VK |
1017 | } |
1018 | } | |
1019 | ||
50b6b87c VK |
1020 | return 0; |
1021 | ||
1022 | remove_table: | |
1023 | /* Free all other OPPs */ | |
1024 | _dev_pm_opp_cpumask_remove_table(cpumask, cpu); | |
1025 | ||
f47b72a1 VK |
1026 | return ret; |
1027 | } | |
1028 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); | |
1029 | ||
1030 | /* | |
1031 | * Works only for OPP v2 bindings. | |
1032 | * | |
1033 | * Returns -ENOENT if operating-points-v2 bindings aren't supported. | |
1034 | */ | |
1035 | /** | |
1036 | * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with | |
1037 | * @cpu_dev using operating-points-v2 | |
1038 | * bindings. | |
1039 | * | |
1040 | * @cpu_dev: CPU device for which we do this operation | |
1041 | * @cpumask: cpumask to update with information of sharing CPUs | |
1042 | * | |
1043 | * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. | |
1044 | * | |
1045 | * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. | |
f47b72a1 VK |
1046 | */ |
1047 | int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, | |
1048 | struct cpumask *cpumask) | |
1049 | { | |
76279291 | 1050 | struct device_node *np, *tmp_np, *cpu_np; |
f47b72a1 VK |
1051 | int cpu, ret = 0; |
1052 | ||
1053 | /* Get OPP descriptor node */ | |
0764c604 | 1054 | np = dev_pm_opp_of_get_opp_desc_node(cpu_dev); |
f47b72a1 | 1055 | if (!np) { |
349aa92e | 1056 | dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__); |
f47b72a1 VK |
1057 | return -ENOENT; |
1058 | } | |
1059 | ||
1060 | cpumask_set_cpu(cpu_dev->id, cpumask); | |
1061 | ||
1062 | /* OPPs are shared ? */ | |
1063 | if (!of_property_read_bool(np, "opp-shared")) | |
1064 | goto put_cpu_node; | |
1065 | ||
1066 | for_each_possible_cpu(cpu) { | |
1067 | if (cpu == cpu_dev->id) | |
1068 | continue; | |
1069 | ||
9867999f | 1070 | cpu_np = of_cpu_device_node_get(cpu); |
76279291 WR |
1071 | if (!cpu_np) { |
1072 | dev_err(cpu_dev, "%s: failed to get cpu%d node\n", | |
f47b72a1 | 1073 | __func__, cpu); |
76279291 | 1074 | ret = -ENOENT; |
f47b72a1 VK |
1075 | goto put_cpu_node; |
1076 | } | |
1077 | ||
1078 | /* Get OPP descriptor node */ | |
fa9b274f | 1079 | tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0); |
9867999f | 1080 | of_node_put(cpu_np); |
f47b72a1 | 1081 | if (!tmp_np) { |
76279291 | 1082 | pr_err("%pOF: Couldn't find opp node\n", cpu_np); |
f47b72a1 VK |
1083 | ret = -ENOENT; |
1084 | goto put_cpu_node; | |
1085 | } | |
1086 | ||
1087 | /* CPUs are sharing opp node */ | |
1088 | if (np == tmp_np) | |
1089 | cpumask_set_cpu(cpu, cpumask); | |
1090 | ||
1091 | of_node_put(tmp_np); | |
1092 | } | |
1093 | ||
1094 | put_cpu_node: | |
1095 | of_node_put(np); | |
1096 | return ret; | |
1097 | } | |
1098 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); | |
a88bd2a5 VK |
1099 | |
1100 | /** | |
4c6a343e | 1101 | * of_get_required_opp_performance_state() - Search for required OPP and return its performance state. |
a88bd2a5 | 1102 | * @np: Node that contains the "required-opps" property. |
4c6a343e | 1103 | * @index: Index of the phandle to parse. |
a88bd2a5 | 1104 | * |
4c6a343e VK |
1105 | * Returns the performance state of the OPP pointed out by the "required-opps" |
1106 | * property at @index in @np. | |
a88bd2a5 | 1107 | * |
2feb5a89 VK |
1108 | * Return: Zero or positive performance state on success, otherwise negative |
1109 | * value on errors. | |
a88bd2a5 | 1110 | */ |
2feb5a89 | 1111 | int of_get_required_opp_performance_state(struct device_node *np, int index) |
a88bd2a5 | 1112 | { |
4c6a343e | 1113 | struct dev_pm_opp *opp; |
a88bd2a5 VK |
1114 | struct device_node *required_np; |
1115 | struct opp_table *opp_table; | |
2feb5a89 | 1116 | int pstate = -EINVAL; |
a88bd2a5 | 1117 | |
4c6a343e VK |
1118 | required_np = of_parse_required_opp(np, index); |
1119 | if (!required_np) | |
2feb5a89 | 1120 | return -EINVAL; |
a88bd2a5 | 1121 | |
4c6a343e VK |
1122 | opp_table = _find_table_of_opp_np(required_np); |
1123 | if (IS_ERR(opp_table)) { | |
1124 | pr_err("%s: Failed to find required OPP table %pOF: %ld\n", | |
1125 | __func__, np, PTR_ERR(opp_table)); | |
1126 | goto put_required_np; | |
a88bd2a5 VK |
1127 | } |
1128 | ||
4c6a343e VK |
1129 | opp = _find_opp_of_np(opp_table, required_np); |
1130 | if (opp) { | |
1131 | pstate = opp->pstate; | |
1132 | dev_pm_opp_put(opp); | |
a88bd2a5 VK |
1133 | } |
1134 | ||
4c6a343e | 1135 | dev_pm_opp_put_opp_table(opp_table); |
a88bd2a5 | 1136 | |
4c6a343e | 1137 | put_required_np: |
a88bd2a5 | 1138 | of_node_put(required_np); |
a88bd2a5 | 1139 | |
4c6a343e | 1140 | return pstate; |
a88bd2a5 | 1141 | } |
4c6a343e | 1142 | EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state); |
e2f4b5f8 VK |
1143 | |
1144 | /** | |
1145 | * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp | |
1146 | * @opp: opp for which DT node has to be returned for | |
1147 | * | |
1148 | * Return: DT node corresponding to the opp, else 0 on success. | |
1149 | * | |
1150 | * The caller needs to put the node with of_node_put() after using it. | |
1151 | */ | |
1152 | struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp) | |
1153 | { | |
1154 | if (IS_ERR_OR_NULL(opp)) { | |
1155 | pr_err("%s: Invalid parameters\n", __func__); | |
1156 | return NULL; | |
1157 | } | |
1158 | ||
1159 | return of_node_get(opp->np); | |
1160 | } | |
1161 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node); | |
a4f342b9 QP |
1162 | |
1163 | /* | |
1164 | * Callback function provided to the Energy Model framework upon registration. | |
1165 | * This computes the power estimated by @CPU at @kHz if it is the frequency | |
1166 | * of an existing OPP, or at the frequency of the first OPP above @kHz otherwise | |
1167 | * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled | |
1168 | * frequency and @mW to the associated power. The power is estimated as | |
1169 | * P = C * V^2 * f with C being the CPU's capacitance and V and f respectively | |
1170 | * the voltage and frequency of the OPP. | |
1171 | * | |
1172 | * Returns -ENODEV if the CPU device cannot be found, -EINVAL if the power | |
1173 | * calculation failed because of missing parameters, 0 otherwise. | |
1174 | */ | |
1175 | static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz, | |
1176 | int cpu) | |
1177 | { | |
1178 | struct device *cpu_dev; | |
1179 | struct dev_pm_opp *opp; | |
1180 | struct device_node *np; | |
1181 | unsigned long mV, Hz; | |
1182 | u32 cap; | |
1183 | u64 tmp; | |
1184 | int ret; | |
1185 | ||
1186 | cpu_dev = get_cpu_device(cpu); | |
1187 | if (!cpu_dev) | |
1188 | return -ENODEV; | |
1189 | ||
1190 | np = of_node_get(cpu_dev->of_node); | |
1191 | if (!np) | |
1192 | return -EINVAL; | |
1193 | ||
1194 | ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap); | |
1195 | of_node_put(np); | |
1196 | if (ret) | |
1197 | return -EINVAL; | |
1198 | ||
1199 | Hz = *kHz * 1000; | |
1200 | opp = dev_pm_opp_find_freq_ceil(cpu_dev, &Hz); | |
1201 | if (IS_ERR(opp)) | |
1202 | return -EINVAL; | |
1203 | ||
1204 | mV = dev_pm_opp_get_voltage(opp) / 1000; | |
1205 | dev_pm_opp_put(opp); | |
1206 | if (!mV) | |
1207 | return -EINVAL; | |
1208 | ||
1209 | tmp = (u64)cap * mV * mV * (Hz / 1000000); | |
1210 | do_div(tmp, 1000000000); | |
1211 | ||
1212 | *mW = (unsigned long)tmp; | |
1213 | *kHz = Hz / 1000; | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | /** | |
1219 | * dev_pm_opp_of_register_em() - Attempt to register an Energy Model | |
1220 | * @cpus : CPUs for which an Energy Model has to be registered | |
1221 | * | |
1222 | * This checks whether the "dynamic-power-coefficient" devicetree property has | |
1223 | * been specified, and tries to register an Energy Model with it if it has. | |
1224 | */ | |
1225 | void dev_pm_opp_of_register_em(struct cpumask *cpus) | |
1226 | { | |
1227 | struct em_data_callback em_cb = EM_DATA_CB(_get_cpu_power); | |
1228 | int ret, nr_opp, cpu = cpumask_first(cpus); | |
1229 | struct device *cpu_dev; | |
1230 | struct device_node *np; | |
1231 | u32 cap; | |
1232 | ||
1233 | cpu_dev = get_cpu_device(cpu); | |
1234 | if (!cpu_dev) | |
1235 | return; | |
1236 | ||
1237 | nr_opp = dev_pm_opp_get_opp_count(cpu_dev); | |
1238 | if (nr_opp <= 0) | |
1239 | return; | |
1240 | ||
1241 | np = of_node_get(cpu_dev->of_node); | |
1242 | if (!np) | |
1243 | return; | |
1244 | ||
1245 | /* | |
1246 | * Register an EM only if the 'dynamic-power-coefficient' property is | |
1247 | * set in devicetree. It is assumed the voltage values are known if that | |
1248 | * property is set since it is useless otherwise. If voltages are not | |
1249 | * known, just let the EM registration fail with an error to alert the | |
1250 | * user about the inconsistent configuration. | |
1251 | */ | |
1252 | ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap); | |
1253 | of_node_put(np); | |
1254 | if (ret || !cap) | |
1255 | return; | |
1256 | ||
1257 | em_register_perf_domain(cpus, nr_opp, &em_cb); | |
1258 | } | |
1259 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em); |