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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> | |
9867999f | 19 | #include <linux/of_device.h> |
3ba98324 | 20 | #include <linux/pm_domain.h> |
dfbe4678 | 21 | #include <linux/slab.h> |
f47b72a1 VK |
22 | #include <linux/export.h> |
23 | ||
24 | #include "opp.h" | |
25 | ||
26 | static struct opp_table *_managed_opp(const struct device_node *np) | |
27 | { | |
b83c1899 VK |
28 | struct opp_table *opp_table, *managed_table = NULL; |
29 | ||
30 | mutex_lock(&opp_table_lock); | |
f47b72a1 | 31 | |
052c6f19 | 32 | list_for_each_entry(opp_table, &opp_tables, node) { |
f47b72a1 VK |
33 | if (opp_table->np == np) { |
34 | /* | |
35 | * Multiple devices can point to the same OPP table and | |
36 | * so will have same node-pointer, np. | |
37 | * | |
38 | * But the OPPs will be considered as shared only if the | |
39 | * OPP table contains a "opp-shared" property. | |
40 | */ | |
b83c1899 VK |
41 | if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) { |
42 | _get_opp_table_kref(opp_table); | |
43 | managed_table = opp_table; | |
44 | } | |
79ee2e8f | 45 | |
b83c1899 | 46 | break; |
f47b72a1 VK |
47 | } |
48 | } | |
49 | ||
b83c1899 VK |
50 | mutex_unlock(&opp_table_lock); |
51 | ||
52 | return managed_table; | |
f47b72a1 VK |
53 | } |
54 | ||
55 | void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) | |
56 | { | |
57 | struct device_node *np; | |
58 | ||
59 | /* | |
60 | * Only required for backward compatibility with v1 bindings, but isn't | |
61 | * harmful for other cases. And so we do it unconditionally. | |
62 | */ | |
63 | np = of_node_get(dev->of_node); | |
64 | if (np) { | |
65 | u32 val; | |
66 | ||
67 | if (!of_property_read_u32(np, "clock-latency", &val)) | |
68 | opp_table->clock_latency_ns_max = val; | |
69 | of_property_read_u32(np, "voltage-tolerance", | |
70 | &opp_table->voltage_tolerance_v1); | |
71 | of_node_put(np); | |
72 | } | |
73 | } | |
74 | ||
75 | static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, | |
76 | struct device_node *np) | |
77 | { | |
78 | unsigned int count = opp_table->supported_hw_count; | |
79 | u32 version; | |
80 | int ret; | |
81 | ||
a4ee4545 DG |
82 | if (!opp_table->supported_hw) { |
83 | /* | |
84 | * In the case that no supported_hw has been set by the | |
85 | * platform but there is an opp-supported-hw value set for | |
86 | * an OPP then the OPP should not be enabled as there is | |
87 | * no way to see if the hardware supports it. | |
88 | */ | |
89 | if (of_find_property(np, "opp-supported-hw", NULL)) | |
90 | return false; | |
91 | else | |
92 | return true; | |
93 | } | |
f47b72a1 VK |
94 | |
95 | while (count--) { | |
96 | ret = of_property_read_u32_index(np, "opp-supported-hw", count, | |
97 | &version); | |
98 | if (ret) { | |
99 | dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", | |
100 | __func__, count, ret); | |
101 | return false; | |
102 | } | |
103 | ||
104 | /* Both of these are bitwise masks of the versions */ | |
105 | if (!(version & opp_table->supported_hw[count])) | |
106 | return false; | |
107 | } | |
108 | ||
109 | return true; | |
110 | } | |
111 | ||
f47b72a1 VK |
112 | static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, |
113 | struct opp_table *opp_table) | |
114 | { | |
dfbe4678 VK |
115 | u32 *microvolt, *microamp = NULL; |
116 | int supplies, vcount, icount, ret, i, j; | |
f47b72a1 VK |
117 | struct property *prop = NULL; |
118 | char name[NAME_MAX]; | |
119 | ||
dfbe4678 VK |
120 | supplies = opp_table->regulator_count ? opp_table->regulator_count : 1; |
121 | ||
f47b72a1 VK |
122 | /* Search for "opp-microvolt-<name>" */ |
123 | if (opp_table->prop_name) { | |
124 | snprintf(name, sizeof(name), "opp-microvolt-%s", | |
125 | opp_table->prop_name); | |
126 | prop = of_find_property(opp->np, name, NULL); | |
127 | } | |
128 | ||
129 | if (!prop) { | |
130 | /* Search for "opp-microvolt" */ | |
131 | sprintf(name, "opp-microvolt"); | |
132 | prop = of_find_property(opp->np, name, NULL); | |
133 | ||
134 | /* Missing property isn't a problem, but an invalid entry is */ | |
688a48b0 VK |
135 | if (!prop) { |
136 | if (!opp_table->regulator_count) | |
137 | return 0; | |
138 | ||
139 | dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n", | |
140 | __func__); | |
141 | return -EINVAL; | |
142 | } | |
f47b72a1 VK |
143 | } |
144 | ||
dfbe4678 VK |
145 | vcount = of_property_count_u32_elems(opp->np, name); |
146 | if (vcount < 0) { | |
f47b72a1 | 147 | dev_err(dev, "%s: Invalid %s property (%d)\n", |
dfbe4678 VK |
148 | __func__, name, vcount); |
149 | return vcount; | |
f47b72a1 VK |
150 | } |
151 | ||
dfbe4678 VK |
152 | /* There can be one or three elements per supply */ |
153 | if (vcount != supplies && vcount != supplies * 3) { | |
154 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
155 | __func__, name, vcount, supplies); | |
f47b72a1 VK |
156 | return -EINVAL; |
157 | } | |
158 | ||
dfbe4678 VK |
159 | microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); |
160 | if (!microvolt) | |
161 | return -ENOMEM; | |
162 | ||
163 | ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); | |
f47b72a1 VK |
164 | if (ret) { |
165 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); | |
dfbe4678 VK |
166 | ret = -EINVAL; |
167 | goto free_microvolt; | |
f47b72a1 VK |
168 | } |
169 | ||
170 | /* Search for "opp-microamp-<name>" */ | |
171 | prop = NULL; | |
172 | if (opp_table->prop_name) { | |
173 | snprintf(name, sizeof(name), "opp-microamp-%s", | |
174 | opp_table->prop_name); | |
175 | prop = of_find_property(opp->np, name, NULL); | |
176 | } | |
177 | ||
178 | if (!prop) { | |
179 | /* Search for "opp-microamp" */ | |
180 | sprintf(name, "opp-microamp"); | |
181 | prop = of_find_property(opp->np, name, NULL); | |
182 | } | |
183 | ||
dfbe4678 VK |
184 | if (prop) { |
185 | icount = of_property_count_u32_elems(opp->np, name); | |
186 | if (icount < 0) { | |
187 | dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, | |
188 | name, icount); | |
189 | ret = icount; | |
190 | goto free_microvolt; | |
191 | } | |
f47b72a1 | 192 | |
dfbe4678 VK |
193 | if (icount != supplies) { |
194 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
195 | __func__, name, icount, supplies); | |
196 | ret = -EINVAL; | |
197 | goto free_microvolt; | |
198 | } | |
199 | ||
200 | microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); | |
201 | if (!microamp) { | |
202 | ret = -EINVAL; | |
203 | goto free_microvolt; | |
204 | } | |
205 | ||
206 | ret = of_property_read_u32_array(opp->np, name, microamp, | |
207 | icount); | |
208 | if (ret) { | |
209 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, | |
210 | name, ret); | |
211 | ret = -EINVAL; | |
212 | goto free_microamp; | |
213 | } | |
214 | } | |
215 | ||
216 | for (i = 0, j = 0; i < supplies; i++) { | |
217 | opp->supplies[i].u_volt = microvolt[j++]; | |
218 | ||
219 | if (vcount == supplies) { | |
220 | opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; | |
221 | opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; | |
222 | } else { | |
223 | opp->supplies[i].u_volt_min = microvolt[j++]; | |
224 | opp->supplies[i].u_volt_max = microvolt[j++]; | |
225 | } | |
226 | ||
227 | if (microamp) | |
228 | opp->supplies[i].u_amp = microamp[i]; | |
229 | } | |
230 | ||
231 | free_microamp: | |
232 | kfree(microamp); | |
233 | free_microvolt: | |
234 | kfree(microvolt); | |
235 | ||
236 | return ret; | |
f47b72a1 VK |
237 | } |
238 | ||
239 | /** | |
240 | * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT | |
241 | * entries | |
242 | * @dev: device pointer used to lookup OPP table. | |
243 | * | |
244 | * Free OPPs created using static entries present in DT. | |
f47b72a1 VK |
245 | */ |
246 | void dev_pm_opp_of_remove_table(struct device *dev) | |
247 | { | |
9274c892 | 248 | _dev_pm_opp_find_and_remove_table(dev, false); |
f47b72a1 VK |
249 | } |
250 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); | |
251 | ||
76279291 WR |
252 | /* Returns opp descriptor node for a device node, caller must |
253 | * do of_node_put() */ | |
fa9b274f VK |
254 | static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np, |
255 | int index) | |
f47b72a1 | 256 | { |
fa9b274f VK |
257 | /* "operating-points-v2" can be an array for power domain providers */ |
258 | return of_parse_phandle(np, "operating-points-v2", index); | |
76279291 WR |
259 | } |
260 | ||
261 | /* Returns opp descriptor node for a device, caller must do of_node_put() */ | |
262 | struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev) | |
263 | { | |
fa9b274f | 264 | return _opp_of_get_opp_desc_node(dev->of_node, 0); |
f47b72a1 | 265 | } |
0764c604 | 266 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node); |
f47b72a1 VK |
267 | |
268 | /** | |
269 | * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) | |
8cd2f6e8 | 270 | * @opp_table: OPP table |
f47b72a1 VK |
271 | * @dev: device for which we do this operation |
272 | * @np: device node | |
273 | * | |
274 | * This function adds an opp definition to the opp table and returns status. The | |
275 | * opp can be controlled using dev_pm_opp_enable/disable functions and may be | |
276 | * removed by dev_pm_opp_remove. | |
277 | * | |
f47b72a1 VK |
278 | * Return: |
279 | * 0 On success OR | |
280 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
281 | * -EEXIST Freq are same and volt are different OR | |
282 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
283 | * -ENOMEM Memory allocation failure | |
284 | * -EINVAL Failed parsing the OPP node | |
285 | */ | |
8cd2f6e8 VK |
286 | static int _opp_add_static_v2(struct opp_table *opp_table, struct device *dev, |
287 | struct device_node *np) | |
f47b72a1 | 288 | { |
f47b72a1 | 289 | struct dev_pm_opp *new_opp; |
6a89e012 | 290 | u64 rate = 0; |
f47b72a1 VK |
291 | u32 val; |
292 | int ret; | |
a1e8c136 | 293 | bool rate_not_available = false; |
f47b72a1 | 294 | |
8cd2f6e8 VK |
295 | new_opp = _opp_allocate(opp_table); |
296 | if (!new_opp) | |
297 | return -ENOMEM; | |
f47b72a1 VK |
298 | |
299 | ret = of_property_read_u64(np, "opp-hz", &rate); | |
300 | if (ret < 0) { | |
a1e8c136 VK |
301 | /* "opp-hz" is optional for devices like power domains. */ |
302 | if (!of_find_property(dev->of_node, "#power-domain-cells", | |
303 | NULL)) { | |
304 | dev_err(dev, "%s: opp-hz not found\n", __func__); | |
305 | goto free_opp; | |
306 | } | |
307 | ||
308 | rate_not_available = true; | |
309 | } else { | |
310 | /* | |
311 | * Rate is defined as an unsigned long in clk API, and so | |
312 | * casting explicitly to its type. Must be fixed once rate is 64 | |
313 | * bit guaranteed in clk API. | |
314 | */ | |
315 | new_opp->rate = (unsigned long)rate; | |
f47b72a1 VK |
316 | } |
317 | ||
318 | /* Check if the OPP supports hardware's hierarchy of versions or not */ | |
319 | if (!_opp_is_supported(dev, opp_table, np)) { | |
320 | dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); | |
321 | goto free_opp; | |
322 | } | |
323 | ||
f47b72a1 VK |
324 | new_opp->turbo = of_property_read_bool(np, "turbo-mode"); |
325 | ||
326 | new_opp->np = np; | |
327 | new_opp->dynamic = false; | |
328 | new_opp->available = true; | |
329 | ||
330 | if (!of_property_read_u32(np, "clock-latency-ns", &val)) | |
331 | new_opp->clock_latency_ns = val; | |
332 | ||
3ba98324 VK |
333 | new_opp->pstate = of_genpd_opp_to_performance_state(dev, np); |
334 | ||
f47b72a1 VK |
335 | ret = opp_parse_supplies(new_opp, dev, opp_table); |
336 | if (ret) | |
337 | goto free_opp; | |
338 | ||
a1e8c136 | 339 | ret = _opp_add(dev, new_opp, opp_table, rate_not_available); |
7f8538eb VK |
340 | if (ret) { |
341 | /* Don't return error for duplicate OPPs */ | |
342 | if (ret == -EBUSY) | |
343 | ret = 0; | |
f47b72a1 | 344 | goto free_opp; |
7f8538eb | 345 | } |
f47b72a1 VK |
346 | |
347 | /* OPP to select on device suspend */ | |
348 | if (of_property_read_bool(np, "opp-suspend")) { | |
349 | if (opp_table->suspend_opp) { | |
350 | dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n", | |
351 | __func__, opp_table->suspend_opp->rate, | |
352 | new_opp->rate); | |
353 | } else { | |
354 | new_opp->suspend = true; | |
355 | opp_table->suspend_opp = new_opp; | |
356 | } | |
357 | } | |
358 | ||
359 | if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) | |
360 | opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; | |
361 | ||
f47b72a1 | 362 | pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", |
0f0fe7e0 | 363 | __func__, new_opp->turbo, new_opp->rate, |
dfbe4678 VK |
364 | new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, |
365 | new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns); | |
f47b72a1 VK |
366 | |
367 | /* | |
368 | * Notify the changes in the availability of the operable | |
369 | * frequency/voltage list. | |
370 | */ | |
052c6f19 | 371 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
f47b72a1 VK |
372 | return 0; |
373 | ||
374 | free_opp: | |
8cd2f6e8 VK |
375 | _opp_free(new_opp); |
376 | ||
f47b72a1 VK |
377 | return ret; |
378 | } | |
379 | ||
380 | /* Initializes OPP tables based on new bindings */ | |
381 | static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np) | |
382 | { | |
383 | struct device_node *np; | |
384 | struct opp_table *opp_table; | |
3ba98324 VK |
385 | int ret = 0, count = 0, pstate_count = 0; |
386 | struct dev_pm_opp *opp; | |
f47b72a1 | 387 | |
f47b72a1 VK |
388 | opp_table = _managed_opp(opp_np); |
389 | if (opp_table) { | |
390 | /* OPPs are already managed */ | |
391 | if (!_add_opp_dev(dev, opp_table)) | |
392 | ret = -ENOMEM; | |
b83c1899 | 393 | goto put_opp_table; |
8cd2f6e8 VK |
394 | } |
395 | ||
b83c1899 VK |
396 | opp_table = dev_pm_opp_get_opp_table(dev); |
397 | if (!opp_table) | |
398 | return -ENOMEM; | |
f47b72a1 VK |
399 | |
400 | /* We have opp-table node now, iterate over it and add OPPs */ | |
401 | for_each_available_child_of_node(opp_np, np) { | |
402 | count++; | |
403 | ||
8cd2f6e8 | 404 | ret = _opp_add_static_v2(opp_table, dev, np); |
f47b72a1 VK |
405 | if (ret) { |
406 | dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, | |
407 | ret); | |
b83c1899 | 408 | _dev_pm_opp_remove_table(opp_table, dev, false); |
7978db34 | 409 | of_node_put(np); |
b83c1899 | 410 | goto put_opp_table; |
f47b72a1 VK |
411 | } |
412 | } | |
413 | ||
414 | /* There should be one of more OPP defined */ | |
8cd2f6e8 VK |
415 | if (WARN_ON(!count)) { |
416 | ret = -ENOENT; | |
b83c1899 | 417 | goto put_opp_table; |
f47b72a1 VK |
418 | } |
419 | ||
3ba98324 VK |
420 | list_for_each_entry(opp, &opp_table->opp_list, node) |
421 | pstate_count += !!opp->pstate; | |
422 | ||
423 | /* Either all or none of the nodes shall have performance state set */ | |
424 | if (pstate_count && pstate_count != count) { | |
425 | dev_err(dev, "Not all nodes have performance state set (%d: %d)\n", | |
426 | count, pstate_count); | |
427 | ret = -ENOENT; | |
428 | goto put_opp_table; | |
429 | } | |
430 | ||
431 | if (pstate_count) | |
432 | opp_table->genpd_performance_state = true; | |
433 | ||
f47b72a1 | 434 | opp_table->np = opp_np; |
79ee2e8f VK |
435 | if (of_property_read_bool(opp_np, "opp-shared")) |
436 | opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED; | |
437 | else | |
438 | opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE; | |
f47b72a1 | 439 | |
b83c1899 VK |
440 | put_opp_table: |
441 | dev_pm_opp_put_opp_table(opp_table); | |
f47b72a1 VK |
442 | |
443 | return ret; | |
444 | } | |
445 | ||
446 | /* Initializes OPP tables based on old-deprecated bindings */ | |
447 | static int _of_add_opp_table_v1(struct device *dev) | |
448 | { | |
8cd2f6e8 | 449 | struct opp_table *opp_table; |
f47b72a1 VK |
450 | const struct property *prop; |
451 | const __be32 *val; | |
8cd2f6e8 | 452 | int nr, ret = 0; |
f47b72a1 VK |
453 | |
454 | prop = of_find_property(dev->of_node, "operating-points", NULL); | |
455 | if (!prop) | |
456 | return -ENODEV; | |
457 | if (!prop->value) | |
458 | return -ENODATA; | |
459 | ||
460 | /* | |
461 | * Each OPP is a set of tuples consisting of frequency and | |
462 | * voltage like <freq-kHz vol-uV>. | |
463 | */ | |
464 | nr = prop->length / sizeof(u32); | |
465 | if (nr % 2) { | |
466 | dev_err(dev, "%s: Invalid OPP table\n", __func__); | |
467 | return -EINVAL; | |
468 | } | |
469 | ||
b83c1899 VK |
470 | opp_table = dev_pm_opp_get_opp_table(dev); |
471 | if (!opp_table) | |
472 | return -ENOMEM; | |
8cd2f6e8 | 473 | |
f47b72a1 VK |
474 | val = prop->value; |
475 | while (nr) { | |
476 | unsigned long freq = be32_to_cpup(val++) * 1000; | |
477 | unsigned long volt = be32_to_cpup(val++); | |
478 | ||
8cd2f6e8 | 479 | ret = _opp_add_v1(opp_table, dev, freq, volt, false); |
04a86a84 VK |
480 | if (ret) { |
481 | dev_err(dev, "%s: Failed to add OPP %ld (%d)\n", | |
482 | __func__, freq, ret); | |
8cd2f6e8 VK |
483 | _dev_pm_opp_remove_table(opp_table, dev, false); |
484 | break; | |
04a86a84 | 485 | } |
f47b72a1 VK |
486 | nr -= 2; |
487 | } | |
488 | ||
b83c1899 | 489 | dev_pm_opp_put_opp_table(opp_table); |
8cd2f6e8 | 490 | return ret; |
f47b72a1 VK |
491 | } |
492 | ||
493 | /** | |
494 | * dev_pm_opp_of_add_table() - Initialize opp table from device tree | |
495 | * @dev: device pointer used to lookup OPP table. | |
496 | * | |
497 | * Register the initial OPP table with the OPP library for given device. | |
498 | * | |
f47b72a1 VK |
499 | * Return: |
500 | * 0 On success OR | |
501 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
502 | * -EEXIST Freq are same and volt are different OR | |
503 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
504 | * -ENOMEM Memory allocation failure | |
505 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
506 | * in device node. | |
507 | * -ENODATA when empty 'operating-points' property is found | |
508 | * -EINVAL when invalid entries are found in opp-v2 table | |
509 | */ | |
510 | int dev_pm_opp_of_add_table(struct device *dev) | |
511 | { | |
512 | struct device_node *opp_np; | |
513 | int ret; | |
514 | ||
515 | /* | |
516 | * OPPs have two version of bindings now. The older one is deprecated, | |
517 | * try for the new binding first. | |
518 | */ | |
0764c604 | 519 | opp_np = dev_pm_opp_of_get_opp_desc_node(dev); |
f47b72a1 VK |
520 | if (!opp_np) { |
521 | /* | |
522 | * Try old-deprecated bindings for backward compatibility with | |
523 | * older dtbs. | |
524 | */ | |
525 | return _of_add_opp_table_v1(dev); | |
526 | } | |
527 | ||
528 | ret = _of_add_opp_table_v2(dev, opp_np); | |
529 | of_node_put(opp_np); | |
530 | ||
531 | return ret; | |
532 | } | |
533 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); | |
534 | ||
fa9b274f VK |
535 | /** |
536 | * dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree | |
537 | * @dev: device pointer used to lookup OPP table. | |
538 | * @index: Index number. | |
539 | * | |
540 | * Register the initial OPP table with the OPP library for given device only | |
541 | * using the "operating-points-v2" property. | |
542 | * | |
543 | * Return: | |
544 | * 0 On success OR | |
545 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
546 | * -EEXIST Freq are same and volt are different OR | |
547 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
548 | * -ENOMEM Memory allocation failure | |
549 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
550 | * in device node. | |
551 | * -ENODATA when empty 'operating-points' property is found | |
552 | * -EINVAL when invalid entries are found in opp-v2 table | |
553 | */ | |
554 | int dev_pm_opp_of_add_table_indexed(struct device *dev, int index) | |
555 | { | |
556 | struct device_node *opp_np; | |
8a352fd8 | 557 | int ret, count; |
fa9b274f | 558 | |
8a352fd8 | 559 | again: |
fa9b274f | 560 | opp_np = _opp_of_get_opp_desc_node(dev->of_node, index); |
8a352fd8 VK |
561 | if (!opp_np) { |
562 | /* | |
563 | * If only one phandle is present, then the same OPP table | |
564 | * applies for all index requests. | |
565 | */ | |
566 | count = of_count_phandle_with_args(dev->of_node, | |
567 | "operating-points-v2", NULL); | |
568 | if (count == 1 && index) { | |
569 | index = 0; | |
570 | goto again; | |
571 | } | |
572 | ||
fa9b274f | 573 | return -ENODEV; |
8a352fd8 | 574 | } |
fa9b274f VK |
575 | |
576 | ret = _of_add_opp_table_v2(dev, opp_np); | |
577 | of_node_put(opp_np); | |
578 | ||
579 | return ret; | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed); | |
582 | ||
f47b72a1 VK |
583 | /* CPU device specific helpers */ |
584 | ||
585 | /** | |
586 | * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask | |
587 | * @cpumask: cpumask for which OPP table needs to be removed | |
588 | * | |
589 | * This removes the OPP tables for CPUs present in the @cpumask. | |
590 | * This should be used only to remove static entries created from DT. | |
f47b72a1 VK |
591 | */ |
592 | void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) | |
593 | { | |
594 | _dev_pm_opp_cpumask_remove_table(cpumask, true); | |
595 | } | |
596 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); | |
597 | ||
598 | /** | |
599 | * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask | |
600 | * @cpumask: cpumask for which OPP table needs to be added. | |
601 | * | |
602 | * This adds the OPP tables for CPUs present in the @cpumask. | |
f47b72a1 VK |
603 | */ |
604 | int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) | |
605 | { | |
606 | struct device *cpu_dev; | |
607 | int cpu, ret = 0; | |
608 | ||
609 | WARN_ON(cpumask_empty(cpumask)); | |
610 | ||
611 | for_each_cpu(cpu, cpumask) { | |
612 | cpu_dev = get_cpu_device(cpu); | |
613 | if (!cpu_dev) { | |
614 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
615 | cpu); | |
616 | continue; | |
617 | } | |
618 | ||
619 | ret = dev_pm_opp_of_add_table(cpu_dev); | |
620 | if (ret) { | |
5b60697c VK |
621 | /* |
622 | * OPP may get registered dynamically, don't print error | |
623 | * message here. | |
624 | */ | |
625 | pr_debug("%s: couldn't find opp table for cpu:%d, %d\n", | |
626 | __func__, cpu, ret); | |
f47b72a1 VK |
627 | |
628 | /* Free all other OPPs */ | |
629 | dev_pm_opp_of_cpumask_remove_table(cpumask); | |
630 | break; | |
631 | } | |
632 | } | |
633 | ||
634 | return ret; | |
635 | } | |
636 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); | |
637 | ||
638 | /* | |
639 | * Works only for OPP v2 bindings. | |
640 | * | |
641 | * Returns -ENOENT if operating-points-v2 bindings aren't supported. | |
642 | */ | |
643 | /** | |
644 | * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with | |
645 | * @cpu_dev using operating-points-v2 | |
646 | * bindings. | |
647 | * | |
648 | * @cpu_dev: CPU device for which we do this operation | |
649 | * @cpumask: cpumask to update with information of sharing CPUs | |
650 | * | |
651 | * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. | |
652 | * | |
653 | * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. | |
f47b72a1 VK |
654 | */ |
655 | int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, | |
656 | struct cpumask *cpumask) | |
657 | { | |
76279291 | 658 | struct device_node *np, *tmp_np, *cpu_np; |
f47b72a1 VK |
659 | int cpu, ret = 0; |
660 | ||
661 | /* Get OPP descriptor node */ | |
0764c604 | 662 | np = dev_pm_opp_of_get_opp_desc_node(cpu_dev); |
f47b72a1 | 663 | if (!np) { |
349aa92e | 664 | dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__); |
f47b72a1 VK |
665 | return -ENOENT; |
666 | } | |
667 | ||
668 | cpumask_set_cpu(cpu_dev->id, cpumask); | |
669 | ||
670 | /* OPPs are shared ? */ | |
671 | if (!of_property_read_bool(np, "opp-shared")) | |
672 | goto put_cpu_node; | |
673 | ||
674 | for_each_possible_cpu(cpu) { | |
675 | if (cpu == cpu_dev->id) | |
676 | continue; | |
677 | ||
9867999f | 678 | cpu_np = of_cpu_device_node_get(cpu); |
76279291 WR |
679 | if (!cpu_np) { |
680 | dev_err(cpu_dev, "%s: failed to get cpu%d node\n", | |
f47b72a1 | 681 | __func__, cpu); |
76279291 | 682 | ret = -ENOENT; |
f47b72a1 VK |
683 | goto put_cpu_node; |
684 | } | |
685 | ||
686 | /* Get OPP descriptor node */ | |
fa9b274f | 687 | tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0); |
9867999f | 688 | of_node_put(cpu_np); |
f47b72a1 | 689 | if (!tmp_np) { |
76279291 | 690 | pr_err("%pOF: Couldn't find opp node\n", cpu_np); |
f47b72a1 VK |
691 | ret = -ENOENT; |
692 | goto put_cpu_node; | |
693 | } | |
694 | ||
695 | /* CPUs are sharing opp node */ | |
696 | if (np == tmp_np) | |
697 | cpumask_set_cpu(cpu, cpumask); | |
698 | ||
699 | of_node_put(tmp_np); | |
700 | } | |
701 | ||
702 | put_cpu_node: | |
703 | of_node_put(np); | |
704 | return ret; | |
705 | } | |
706 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); | |
a88bd2a5 VK |
707 | |
708 | /** | |
709 | * of_dev_pm_opp_find_required_opp() - Search for required OPP. | |
710 | * @dev: The device whose OPP node is referenced by the 'np' DT node. | |
711 | * @np: Node that contains the "required-opps" property. | |
712 | * | |
713 | * Returns the OPP of the device 'dev', whose phandle is present in the "np" | |
714 | * node. Although the "required-opps" property supports having multiple | |
715 | * phandles, this helper routine only parses the very first phandle in the list. | |
716 | * | |
717 | * Return: Matching opp, else returns ERR_PTR in case of error and should be | |
718 | * handled using IS_ERR. | |
719 | * | |
720 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
721 | * use. | |
722 | */ | |
723 | struct dev_pm_opp *of_dev_pm_opp_find_required_opp(struct device *dev, | |
724 | struct device_node *np) | |
725 | { | |
726 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ENODEV); | |
727 | struct device_node *required_np; | |
728 | struct opp_table *opp_table; | |
729 | ||
730 | opp_table = _find_opp_table(dev); | |
731 | if (IS_ERR(opp_table)) | |
732 | return ERR_CAST(opp_table); | |
733 | ||
734 | required_np = of_parse_phandle(np, "required-opps", 0); | |
735 | if (unlikely(!required_np)) { | |
736 | dev_err(dev, "Unable to parse required-opps\n"); | |
737 | goto put_opp_table; | |
738 | } | |
739 | ||
740 | mutex_lock(&opp_table->lock); | |
741 | ||
742 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
743 | if (temp_opp->available && temp_opp->np == required_np) { | |
744 | opp = temp_opp; | |
745 | ||
746 | /* Increment the reference count of OPP */ | |
747 | dev_pm_opp_get(opp); | |
748 | break; | |
749 | } | |
750 | } | |
751 | ||
752 | mutex_unlock(&opp_table->lock); | |
753 | ||
754 | of_node_put(required_np); | |
755 | put_opp_table: | |
756 | dev_pm_opp_put_opp_table(opp_table); | |
757 | ||
758 | return opp; | |
759 | } | |
760 | EXPORT_SYMBOL_GPL(of_dev_pm_opp_find_required_opp); | |
e2f4b5f8 VK |
761 | |
762 | /** | |
763 | * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp | |
764 | * @opp: opp for which DT node has to be returned for | |
765 | * | |
766 | * Return: DT node corresponding to the opp, else 0 on success. | |
767 | * | |
768 | * The caller needs to put the node with of_node_put() after using it. | |
769 | */ | |
770 | struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp) | |
771 | { | |
772 | if (IS_ERR_OR_NULL(opp)) { | |
773 | pr_err("%s: Invalid parameters\n", __func__); | |
774 | return NULL; | |
775 | } | |
776 | ||
777 | return of_node_get(opp->np); | |
778 | } | |
779 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node); |