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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 | ||
f06ed90e VK |
26 | /* |
27 | * Returns opp descriptor node for a device node, caller must | |
28 | * do of_node_put(). | |
29 | */ | |
30 | static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np, | |
31 | int index) | |
32 | { | |
33 | /* "operating-points-v2" can be an array for power domain providers */ | |
34 | return of_parse_phandle(np, "operating-points-v2", index); | |
35 | } | |
36 | ||
37 | /* Returns opp descriptor node for a device, caller must do of_node_put() */ | |
38 | struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev) | |
39 | { | |
40 | return _opp_of_get_opp_desc_node(dev->of_node, 0); | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node); | |
43 | ||
f47b72a1 VK |
44 | static struct opp_table *_managed_opp(const struct device_node *np) |
45 | { | |
b83c1899 VK |
46 | struct opp_table *opp_table, *managed_table = NULL; |
47 | ||
48 | mutex_lock(&opp_table_lock); | |
f47b72a1 | 49 | |
052c6f19 | 50 | list_for_each_entry(opp_table, &opp_tables, node) { |
f47b72a1 VK |
51 | if (opp_table->np == np) { |
52 | /* | |
53 | * Multiple devices can point to the same OPP table and | |
54 | * so will have same node-pointer, np. | |
55 | * | |
56 | * But the OPPs will be considered as shared only if the | |
57 | * OPP table contains a "opp-shared" property. | |
58 | */ | |
b83c1899 VK |
59 | if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) { |
60 | _get_opp_table_kref(opp_table); | |
61 | managed_table = opp_table; | |
62 | } | |
79ee2e8f | 63 | |
b83c1899 | 64 | break; |
f47b72a1 VK |
65 | } |
66 | } | |
67 | ||
b83c1899 VK |
68 | mutex_unlock(&opp_table_lock); |
69 | ||
70 | return managed_table; | |
f47b72a1 VK |
71 | } |
72 | ||
eb7c8743 VK |
73 | void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, |
74 | int index) | |
f47b72a1 | 75 | { |
f06ed90e VK |
76 | struct device_node *np, *opp_np; |
77 | u32 val; | |
f47b72a1 VK |
78 | |
79 | /* | |
80 | * Only required for backward compatibility with v1 bindings, but isn't | |
81 | * harmful for other cases. And so we do it unconditionally. | |
82 | */ | |
83 | np = of_node_get(dev->of_node); | |
f06ed90e VK |
84 | if (!np) |
85 | return; | |
86 | ||
87 | if (!of_property_read_u32(np, "clock-latency", &val)) | |
88 | opp_table->clock_latency_ns_max = val; | |
89 | of_property_read_u32(np, "voltage-tolerance", | |
90 | &opp_table->voltage_tolerance_v1); | |
91 | ||
92 | /* Get OPP table node */ | |
93 | opp_np = _opp_of_get_opp_desc_node(np, index); | |
94 | of_node_put(np); | |
95 | ||
96 | if (!opp_np) | |
97 | return; | |
98 | ||
99 | if (of_property_read_bool(opp_np, "opp-shared")) | |
100 | opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED; | |
101 | else | |
102 | opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE; | |
103 | ||
104 | opp_table->np = opp_np; | |
105 | ||
106 | of_node_put(opp_np); | |
f47b72a1 VK |
107 | } |
108 | ||
109 | static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, | |
110 | struct device_node *np) | |
111 | { | |
112 | unsigned int count = opp_table->supported_hw_count; | |
113 | u32 version; | |
114 | int ret; | |
115 | ||
a4ee4545 DG |
116 | if (!opp_table->supported_hw) { |
117 | /* | |
118 | * In the case that no supported_hw has been set by the | |
119 | * platform but there is an opp-supported-hw value set for | |
120 | * an OPP then the OPP should not be enabled as there is | |
121 | * no way to see if the hardware supports it. | |
122 | */ | |
123 | if (of_find_property(np, "opp-supported-hw", NULL)) | |
124 | return false; | |
125 | else | |
126 | return true; | |
127 | } | |
f47b72a1 VK |
128 | |
129 | while (count--) { | |
130 | ret = of_property_read_u32_index(np, "opp-supported-hw", count, | |
131 | &version); | |
132 | if (ret) { | |
133 | dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", | |
134 | __func__, count, ret); | |
135 | return false; | |
136 | } | |
137 | ||
138 | /* Both of these are bitwise masks of the versions */ | |
139 | if (!(version & opp_table->supported_hw[count])) | |
140 | return false; | |
141 | } | |
142 | ||
143 | return true; | |
144 | } | |
145 | ||
f47b72a1 VK |
146 | static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, |
147 | struct opp_table *opp_table) | |
148 | { | |
dfbe4678 VK |
149 | u32 *microvolt, *microamp = NULL; |
150 | int supplies, vcount, icount, ret, i, j; | |
f47b72a1 VK |
151 | struct property *prop = NULL; |
152 | char name[NAME_MAX]; | |
153 | ||
dfbe4678 VK |
154 | supplies = opp_table->regulator_count ? opp_table->regulator_count : 1; |
155 | ||
f47b72a1 VK |
156 | /* Search for "opp-microvolt-<name>" */ |
157 | if (opp_table->prop_name) { | |
158 | snprintf(name, sizeof(name), "opp-microvolt-%s", | |
159 | opp_table->prop_name); | |
160 | prop = of_find_property(opp->np, name, NULL); | |
161 | } | |
162 | ||
163 | if (!prop) { | |
164 | /* Search for "opp-microvolt" */ | |
165 | sprintf(name, "opp-microvolt"); | |
166 | prop = of_find_property(opp->np, name, NULL); | |
167 | ||
168 | /* Missing property isn't a problem, but an invalid entry is */ | |
688a48b0 VK |
169 | if (!prop) { |
170 | if (!opp_table->regulator_count) | |
171 | return 0; | |
172 | ||
173 | dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n", | |
174 | __func__); | |
175 | return -EINVAL; | |
176 | } | |
f47b72a1 VK |
177 | } |
178 | ||
dfbe4678 VK |
179 | vcount = of_property_count_u32_elems(opp->np, name); |
180 | if (vcount < 0) { | |
f47b72a1 | 181 | dev_err(dev, "%s: Invalid %s property (%d)\n", |
dfbe4678 VK |
182 | __func__, name, vcount); |
183 | return vcount; | |
f47b72a1 VK |
184 | } |
185 | ||
dfbe4678 VK |
186 | /* There can be one or three elements per supply */ |
187 | if (vcount != supplies && vcount != supplies * 3) { | |
188 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
189 | __func__, name, vcount, supplies); | |
f47b72a1 VK |
190 | return -EINVAL; |
191 | } | |
192 | ||
dfbe4678 VK |
193 | microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); |
194 | if (!microvolt) | |
195 | return -ENOMEM; | |
196 | ||
197 | ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); | |
f47b72a1 VK |
198 | if (ret) { |
199 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); | |
dfbe4678 VK |
200 | ret = -EINVAL; |
201 | goto free_microvolt; | |
f47b72a1 VK |
202 | } |
203 | ||
204 | /* Search for "opp-microamp-<name>" */ | |
205 | prop = NULL; | |
206 | if (opp_table->prop_name) { | |
207 | snprintf(name, sizeof(name), "opp-microamp-%s", | |
208 | opp_table->prop_name); | |
209 | prop = of_find_property(opp->np, name, NULL); | |
210 | } | |
211 | ||
212 | if (!prop) { | |
213 | /* Search for "opp-microamp" */ | |
214 | sprintf(name, "opp-microamp"); | |
215 | prop = of_find_property(opp->np, name, NULL); | |
216 | } | |
217 | ||
dfbe4678 VK |
218 | if (prop) { |
219 | icount = of_property_count_u32_elems(opp->np, name); | |
220 | if (icount < 0) { | |
221 | dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, | |
222 | name, icount); | |
223 | ret = icount; | |
224 | goto free_microvolt; | |
225 | } | |
f47b72a1 | 226 | |
dfbe4678 VK |
227 | if (icount != supplies) { |
228 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
229 | __func__, name, icount, supplies); | |
230 | ret = -EINVAL; | |
231 | goto free_microvolt; | |
232 | } | |
233 | ||
234 | microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); | |
235 | if (!microamp) { | |
236 | ret = -EINVAL; | |
237 | goto free_microvolt; | |
238 | } | |
239 | ||
240 | ret = of_property_read_u32_array(opp->np, name, microamp, | |
241 | icount); | |
242 | if (ret) { | |
243 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, | |
244 | name, ret); | |
245 | ret = -EINVAL; | |
246 | goto free_microamp; | |
247 | } | |
248 | } | |
249 | ||
250 | for (i = 0, j = 0; i < supplies; i++) { | |
251 | opp->supplies[i].u_volt = microvolt[j++]; | |
252 | ||
253 | if (vcount == supplies) { | |
254 | opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; | |
255 | opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; | |
256 | } else { | |
257 | opp->supplies[i].u_volt_min = microvolt[j++]; | |
258 | opp->supplies[i].u_volt_max = microvolt[j++]; | |
259 | } | |
260 | ||
261 | if (microamp) | |
262 | opp->supplies[i].u_amp = microamp[i]; | |
263 | } | |
264 | ||
265 | free_microamp: | |
266 | kfree(microamp); | |
267 | free_microvolt: | |
268 | kfree(microvolt); | |
269 | ||
270 | return ret; | |
f47b72a1 VK |
271 | } |
272 | ||
273 | /** | |
274 | * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT | |
275 | * entries | |
276 | * @dev: device pointer used to lookup OPP table. | |
277 | * | |
278 | * Free OPPs created using static entries present in DT. | |
f47b72a1 VK |
279 | */ |
280 | void dev_pm_opp_of_remove_table(struct device *dev) | |
281 | { | |
2a4eb735 | 282 | _dev_pm_opp_find_and_remove_table(dev); |
f47b72a1 VK |
283 | } |
284 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); | |
285 | ||
f47b72a1 VK |
286 | /** |
287 | * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) | |
8cd2f6e8 | 288 | * @opp_table: OPP table |
f47b72a1 VK |
289 | * @dev: device for which we do this operation |
290 | * @np: device node | |
291 | * | |
292 | * This function adds an opp definition to the opp table and returns status. The | |
293 | * opp can be controlled using dev_pm_opp_enable/disable functions and may be | |
294 | * removed by dev_pm_opp_remove. | |
295 | * | |
f47b72a1 VK |
296 | * Return: |
297 | * 0 On success OR | |
298 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
299 | * -EEXIST Freq are same and volt are different OR | |
300 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
301 | * -ENOMEM Memory allocation failure | |
302 | * -EINVAL Failed parsing the OPP node | |
303 | */ | |
8cd2f6e8 VK |
304 | static int _opp_add_static_v2(struct opp_table *opp_table, struct device *dev, |
305 | struct device_node *np) | |
f47b72a1 | 306 | { |
f47b72a1 | 307 | struct dev_pm_opp *new_opp; |
6a89e012 | 308 | u64 rate = 0; |
f47b72a1 VK |
309 | u32 val; |
310 | int ret; | |
a1e8c136 | 311 | bool rate_not_available = false; |
f47b72a1 | 312 | |
8cd2f6e8 VK |
313 | new_opp = _opp_allocate(opp_table); |
314 | if (!new_opp) | |
315 | return -ENOMEM; | |
f47b72a1 VK |
316 | |
317 | ret = of_property_read_u64(np, "opp-hz", &rate); | |
318 | if (ret < 0) { | |
a1e8c136 VK |
319 | /* "opp-hz" is optional for devices like power domains. */ |
320 | if (!of_find_property(dev->of_node, "#power-domain-cells", | |
321 | NULL)) { | |
322 | dev_err(dev, "%s: opp-hz not found\n", __func__); | |
323 | goto free_opp; | |
324 | } | |
325 | ||
326 | rate_not_available = true; | |
327 | } else { | |
328 | /* | |
329 | * Rate is defined as an unsigned long in clk API, and so | |
330 | * casting explicitly to its type. Must be fixed once rate is 64 | |
331 | * bit guaranteed in clk API. | |
332 | */ | |
333 | new_opp->rate = (unsigned long)rate; | |
f47b72a1 VK |
334 | } |
335 | ||
336 | /* Check if the OPP supports hardware's hierarchy of versions or not */ | |
337 | if (!_opp_is_supported(dev, opp_table, np)) { | |
338 | dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); | |
339 | goto free_opp; | |
340 | } | |
341 | ||
f47b72a1 VK |
342 | new_opp->turbo = of_property_read_bool(np, "turbo-mode"); |
343 | ||
344 | new_opp->np = np; | |
345 | new_opp->dynamic = false; | |
346 | new_opp->available = true; | |
347 | ||
348 | if (!of_property_read_u32(np, "clock-latency-ns", &val)) | |
349 | new_opp->clock_latency_ns = val; | |
350 | ||
3ba98324 VK |
351 | new_opp->pstate = of_genpd_opp_to_performance_state(dev, np); |
352 | ||
f47b72a1 VK |
353 | ret = opp_parse_supplies(new_opp, dev, opp_table); |
354 | if (ret) | |
355 | goto free_opp; | |
356 | ||
a1e8c136 | 357 | ret = _opp_add(dev, new_opp, opp_table, rate_not_available); |
7f8538eb VK |
358 | if (ret) { |
359 | /* Don't return error for duplicate OPPs */ | |
360 | if (ret == -EBUSY) | |
361 | ret = 0; | |
f47b72a1 | 362 | goto free_opp; |
7f8538eb | 363 | } |
f47b72a1 VK |
364 | |
365 | /* OPP to select on device suspend */ | |
366 | if (of_property_read_bool(np, "opp-suspend")) { | |
367 | if (opp_table->suspend_opp) { | |
368 | dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n", | |
369 | __func__, opp_table->suspend_opp->rate, | |
370 | new_opp->rate); | |
371 | } else { | |
372 | new_opp->suspend = true; | |
373 | opp_table->suspend_opp = new_opp; | |
374 | } | |
375 | } | |
376 | ||
377 | if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) | |
378 | opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; | |
379 | ||
f47b72a1 | 380 | pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", |
0f0fe7e0 | 381 | __func__, new_opp->turbo, new_opp->rate, |
dfbe4678 VK |
382 | new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, |
383 | new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns); | |
f47b72a1 VK |
384 | |
385 | /* | |
386 | * Notify the changes in the availability of the operable | |
387 | * frequency/voltage list. | |
388 | */ | |
052c6f19 | 389 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
f47b72a1 VK |
390 | return 0; |
391 | ||
392 | free_opp: | |
8cd2f6e8 VK |
393 | _opp_free(new_opp); |
394 | ||
f47b72a1 VK |
395 | return ret; |
396 | } | |
397 | ||
398 | /* Initializes OPP tables based on new bindings */ | |
eb7c8743 VK |
399 | static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np, |
400 | int index) | |
f47b72a1 VK |
401 | { |
402 | struct device_node *np; | |
403 | struct opp_table *opp_table; | |
3ba98324 VK |
404 | int ret = 0, count = 0, pstate_count = 0; |
405 | struct dev_pm_opp *opp; | |
f47b72a1 | 406 | |
f47b72a1 VK |
407 | opp_table = _managed_opp(opp_np); |
408 | if (opp_table) { | |
409 | /* OPPs are already managed */ | |
cdd6ed90 | 410 | if (!_add_opp_dev(dev, opp_table)) { |
f47b72a1 | 411 | ret = -ENOMEM; |
cdd6ed90 VK |
412 | goto put_opp_table; |
413 | } | |
414 | ||
415 | if (opp_table->parsed_static_opps) { | |
d0e8ae6c | 416 | kref_get(&opp_table->list_kref); |
cdd6ed90 VK |
417 | return 0; |
418 | } | |
f06ed90e | 419 | |
cdd6ed90 | 420 | goto initialize_static_opps; |
8cd2f6e8 VK |
421 | } |
422 | ||
eb7c8743 | 423 | opp_table = dev_pm_opp_get_opp_table_indexed(dev, index); |
b83c1899 VK |
424 | if (!opp_table) |
425 | return -ENOMEM; | |
f47b72a1 | 426 | |
f06ed90e | 427 | initialize_static_opps: |
d0e8ae6c VK |
428 | kref_init(&opp_table->list_kref); |
429 | ||
f47b72a1 VK |
430 | /* We have opp-table node now, iterate over it and add OPPs */ |
431 | for_each_available_child_of_node(opp_np, np) { | |
432 | count++; | |
433 | ||
8cd2f6e8 | 434 | ret = _opp_add_static_v2(opp_table, dev, np); |
f47b72a1 VK |
435 | if (ret) { |
436 | dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, | |
437 | ret); | |
7978db34 | 438 | of_node_put(np); |
cdd6ed90 | 439 | goto put_list_kref; |
f47b72a1 VK |
440 | } |
441 | } | |
442 | ||
443 | /* There should be one of more OPP defined */ | |
8cd2f6e8 VK |
444 | if (WARN_ON(!count)) { |
445 | ret = -ENOENT; | |
cdd6ed90 | 446 | goto put_list_kref; |
f47b72a1 VK |
447 | } |
448 | ||
3ba98324 VK |
449 | list_for_each_entry(opp, &opp_table->opp_list, node) |
450 | pstate_count += !!opp->pstate; | |
451 | ||
452 | /* Either all or none of the nodes shall have performance state set */ | |
453 | if (pstate_count && pstate_count != count) { | |
454 | dev_err(dev, "Not all nodes have performance state set (%d: %d)\n", | |
455 | count, pstate_count); | |
456 | ret = -ENOENT; | |
cdd6ed90 | 457 | goto put_list_kref; |
3ba98324 VK |
458 | } |
459 | ||
460 | if (pstate_count) | |
461 | opp_table->genpd_performance_state = true; | |
462 | ||
f06ed90e | 463 | opp_table->parsed_static_opps = true; |
f47b72a1 | 464 | |
cdd6ed90 VK |
465 | return 0; |
466 | ||
467 | put_list_kref: | |
468 | _put_opp_list_kref(opp_table); | |
b83c1899 VK |
469 | put_opp_table: |
470 | dev_pm_opp_put_opp_table(opp_table); | |
f47b72a1 VK |
471 | |
472 | return ret; | |
473 | } | |
474 | ||
475 | /* Initializes OPP tables based on old-deprecated bindings */ | |
476 | static int _of_add_opp_table_v1(struct device *dev) | |
477 | { | |
8cd2f6e8 | 478 | struct opp_table *opp_table; |
f47b72a1 VK |
479 | const struct property *prop; |
480 | const __be32 *val; | |
8cd2f6e8 | 481 | int nr, ret = 0; |
f47b72a1 VK |
482 | |
483 | prop = of_find_property(dev->of_node, "operating-points", NULL); | |
484 | if (!prop) | |
485 | return -ENODEV; | |
486 | if (!prop->value) | |
487 | return -ENODATA; | |
488 | ||
489 | /* | |
490 | * Each OPP is a set of tuples consisting of frequency and | |
491 | * voltage like <freq-kHz vol-uV>. | |
492 | */ | |
493 | nr = prop->length / sizeof(u32); | |
494 | if (nr % 2) { | |
495 | dev_err(dev, "%s: Invalid OPP table\n", __func__); | |
496 | return -EINVAL; | |
497 | } | |
498 | ||
b83c1899 VK |
499 | opp_table = dev_pm_opp_get_opp_table(dev); |
500 | if (!opp_table) | |
501 | return -ENOMEM; | |
8cd2f6e8 | 502 | |
d0e8ae6c VK |
503 | kref_init(&opp_table->list_kref); |
504 | ||
f47b72a1 VK |
505 | val = prop->value; |
506 | while (nr) { | |
507 | unsigned long freq = be32_to_cpup(val++) * 1000; | |
508 | unsigned long volt = be32_to_cpup(val++); | |
509 | ||
8cd2f6e8 | 510 | ret = _opp_add_v1(opp_table, dev, freq, volt, false); |
04a86a84 VK |
511 | if (ret) { |
512 | dev_err(dev, "%s: Failed to add OPP %ld (%d)\n", | |
513 | __func__, freq, ret); | |
cdd6ed90 VK |
514 | _put_opp_list_kref(opp_table); |
515 | dev_pm_opp_put_opp_table(opp_table); | |
516 | return ret; | |
04a86a84 | 517 | } |
f47b72a1 VK |
518 | nr -= 2; |
519 | } | |
520 | ||
8cd2f6e8 | 521 | return ret; |
f47b72a1 VK |
522 | } |
523 | ||
524 | /** | |
525 | * dev_pm_opp_of_add_table() - Initialize opp table from device tree | |
526 | * @dev: device pointer used to lookup OPP table. | |
527 | * | |
528 | * Register the initial OPP table with the OPP library for given device. | |
529 | * | |
f47b72a1 VK |
530 | * Return: |
531 | * 0 On success OR | |
532 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
533 | * -EEXIST Freq are same and volt are different OR | |
534 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
535 | * -ENOMEM Memory allocation failure | |
536 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
537 | * in device node. | |
538 | * -ENODATA when empty 'operating-points' property is found | |
539 | * -EINVAL when invalid entries are found in opp-v2 table | |
540 | */ | |
541 | int dev_pm_opp_of_add_table(struct device *dev) | |
542 | { | |
543 | struct device_node *opp_np; | |
544 | int ret; | |
545 | ||
546 | /* | |
547 | * OPPs have two version of bindings now. The older one is deprecated, | |
548 | * try for the new binding first. | |
549 | */ | |
0764c604 | 550 | opp_np = dev_pm_opp_of_get_opp_desc_node(dev); |
f47b72a1 VK |
551 | if (!opp_np) { |
552 | /* | |
553 | * Try old-deprecated bindings for backward compatibility with | |
554 | * older dtbs. | |
555 | */ | |
556 | return _of_add_opp_table_v1(dev); | |
557 | } | |
558 | ||
eb7c8743 | 559 | ret = _of_add_opp_table_v2(dev, opp_np, 0); |
f47b72a1 VK |
560 | of_node_put(opp_np); |
561 | ||
562 | return ret; | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); | |
565 | ||
fa9b274f VK |
566 | /** |
567 | * dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree | |
568 | * @dev: device pointer used to lookup OPP table. | |
569 | * @index: Index number. | |
570 | * | |
571 | * Register the initial OPP table with the OPP library for given device only | |
572 | * using the "operating-points-v2" property. | |
573 | * | |
574 | * Return: | |
575 | * 0 On success OR | |
576 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
577 | * -EEXIST Freq are same and volt are different OR | |
578 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
579 | * -ENOMEM Memory allocation failure | |
580 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
581 | * in device node. | |
582 | * -ENODATA when empty 'operating-points' property is found | |
583 | * -EINVAL when invalid entries are found in opp-v2 table | |
584 | */ | |
585 | int dev_pm_opp_of_add_table_indexed(struct device *dev, int index) | |
586 | { | |
587 | struct device_node *opp_np; | |
8a352fd8 | 588 | int ret, count; |
fa9b274f | 589 | |
8a352fd8 | 590 | again: |
fa9b274f | 591 | opp_np = _opp_of_get_opp_desc_node(dev->of_node, index); |
8a352fd8 VK |
592 | if (!opp_np) { |
593 | /* | |
594 | * If only one phandle is present, then the same OPP table | |
595 | * applies for all index requests. | |
596 | */ | |
597 | count = of_count_phandle_with_args(dev->of_node, | |
598 | "operating-points-v2", NULL); | |
599 | if (count == 1 && index) { | |
600 | index = 0; | |
601 | goto again; | |
602 | } | |
603 | ||
fa9b274f | 604 | return -ENODEV; |
8a352fd8 | 605 | } |
fa9b274f | 606 | |
eb7c8743 | 607 | ret = _of_add_opp_table_v2(dev, opp_np, index); |
fa9b274f VK |
608 | of_node_put(opp_np); |
609 | ||
610 | return ret; | |
611 | } | |
612 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed); | |
613 | ||
f47b72a1 VK |
614 | /* CPU device specific helpers */ |
615 | ||
616 | /** | |
617 | * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask | |
618 | * @cpumask: cpumask for which OPP table needs to be removed | |
619 | * | |
620 | * This removes the OPP tables for CPUs present in the @cpumask. | |
621 | * This should be used only to remove static entries created from DT. | |
f47b72a1 VK |
622 | */ |
623 | void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) | |
624 | { | |
2a4eb735 | 625 | _dev_pm_opp_cpumask_remove_table(cpumask, -1); |
f47b72a1 VK |
626 | } |
627 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); | |
628 | ||
629 | /** | |
630 | * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask | |
631 | * @cpumask: cpumask for which OPP table needs to be added. | |
632 | * | |
633 | * This adds the OPP tables for CPUs present in the @cpumask. | |
f47b72a1 VK |
634 | */ |
635 | int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) | |
636 | { | |
637 | struct device *cpu_dev; | |
638 | int cpu, ret = 0; | |
639 | ||
640 | WARN_ON(cpumask_empty(cpumask)); | |
641 | ||
642 | for_each_cpu(cpu, cpumask) { | |
643 | cpu_dev = get_cpu_device(cpu); | |
644 | if (!cpu_dev) { | |
645 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
646 | cpu); | |
647 | continue; | |
648 | } | |
649 | ||
650 | ret = dev_pm_opp_of_add_table(cpu_dev); | |
651 | if (ret) { | |
5b60697c VK |
652 | /* |
653 | * OPP may get registered dynamically, don't print error | |
654 | * message here. | |
655 | */ | |
656 | pr_debug("%s: couldn't find opp table for cpu:%d, %d\n", | |
657 | __func__, cpu, ret); | |
f47b72a1 VK |
658 | |
659 | /* Free all other OPPs */ | |
2a4eb735 | 660 | _dev_pm_opp_cpumask_remove_table(cpumask, cpu); |
f47b72a1 VK |
661 | break; |
662 | } | |
663 | } | |
664 | ||
665 | return ret; | |
666 | } | |
667 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); | |
668 | ||
669 | /* | |
670 | * Works only for OPP v2 bindings. | |
671 | * | |
672 | * Returns -ENOENT if operating-points-v2 bindings aren't supported. | |
673 | */ | |
674 | /** | |
675 | * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with | |
676 | * @cpu_dev using operating-points-v2 | |
677 | * bindings. | |
678 | * | |
679 | * @cpu_dev: CPU device for which we do this operation | |
680 | * @cpumask: cpumask to update with information of sharing CPUs | |
681 | * | |
682 | * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. | |
683 | * | |
684 | * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. | |
f47b72a1 VK |
685 | */ |
686 | int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, | |
687 | struct cpumask *cpumask) | |
688 | { | |
76279291 | 689 | struct device_node *np, *tmp_np, *cpu_np; |
f47b72a1 VK |
690 | int cpu, ret = 0; |
691 | ||
692 | /* Get OPP descriptor node */ | |
0764c604 | 693 | np = dev_pm_opp_of_get_opp_desc_node(cpu_dev); |
f47b72a1 | 694 | if (!np) { |
349aa92e | 695 | dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__); |
f47b72a1 VK |
696 | return -ENOENT; |
697 | } | |
698 | ||
699 | cpumask_set_cpu(cpu_dev->id, cpumask); | |
700 | ||
701 | /* OPPs are shared ? */ | |
702 | if (!of_property_read_bool(np, "opp-shared")) | |
703 | goto put_cpu_node; | |
704 | ||
705 | for_each_possible_cpu(cpu) { | |
706 | if (cpu == cpu_dev->id) | |
707 | continue; | |
708 | ||
9867999f | 709 | cpu_np = of_cpu_device_node_get(cpu); |
76279291 WR |
710 | if (!cpu_np) { |
711 | dev_err(cpu_dev, "%s: failed to get cpu%d node\n", | |
f47b72a1 | 712 | __func__, cpu); |
76279291 | 713 | ret = -ENOENT; |
f47b72a1 VK |
714 | goto put_cpu_node; |
715 | } | |
716 | ||
717 | /* Get OPP descriptor node */ | |
fa9b274f | 718 | tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0); |
9867999f | 719 | of_node_put(cpu_np); |
f47b72a1 | 720 | if (!tmp_np) { |
76279291 | 721 | pr_err("%pOF: Couldn't find opp node\n", cpu_np); |
f47b72a1 VK |
722 | ret = -ENOENT; |
723 | goto put_cpu_node; | |
724 | } | |
725 | ||
726 | /* CPUs are sharing opp node */ | |
727 | if (np == tmp_np) | |
728 | cpumask_set_cpu(cpu, cpumask); | |
729 | ||
730 | of_node_put(tmp_np); | |
731 | } | |
732 | ||
733 | put_cpu_node: | |
734 | of_node_put(np); | |
735 | return ret; | |
736 | } | |
737 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); | |
a88bd2a5 VK |
738 | |
739 | /** | |
740 | * of_dev_pm_opp_find_required_opp() - Search for required OPP. | |
741 | * @dev: The device whose OPP node is referenced by the 'np' DT node. | |
742 | * @np: Node that contains the "required-opps" property. | |
743 | * | |
744 | * Returns the OPP of the device 'dev', whose phandle is present in the "np" | |
745 | * node. Although the "required-opps" property supports having multiple | |
746 | * phandles, this helper routine only parses the very first phandle in the list. | |
747 | * | |
748 | * Return: Matching opp, else returns ERR_PTR in case of error and should be | |
749 | * handled using IS_ERR. | |
750 | * | |
751 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
752 | * use. | |
753 | */ | |
754 | struct dev_pm_opp *of_dev_pm_opp_find_required_opp(struct device *dev, | |
755 | struct device_node *np) | |
756 | { | |
757 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ENODEV); | |
758 | struct device_node *required_np; | |
759 | struct opp_table *opp_table; | |
760 | ||
761 | opp_table = _find_opp_table(dev); | |
762 | if (IS_ERR(opp_table)) | |
763 | return ERR_CAST(opp_table); | |
764 | ||
765 | required_np = of_parse_phandle(np, "required-opps", 0); | |
766 | if (unlikely(!required_np)) { | |
767 | dev_err(dev, "Unable to parse required-opps\n"); | |
768 | goto put_opp_table; | |
769 | } | |
770 | ||
771 | mutex_lock(&opp_table->lock); | |
772 | ||
773 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
774 | if (temp_opp->available && temp_opp->np == required_np) { | |
775 | opp = temp_opp; | |
776 | ||
777 | /* Increment the reference count of OPP */ | |
778 | dev_pm_opp_get(opp); | |
779 | break; | |
780 | } | |
781 | } | |
782 | ||
783 | mutex_unlock(&opp_table->lock); | |
784 | ||
785 | of_node_put(required_np); | |
786 | put_opp_table: | |
787 | dev_pm_opp_put_opp_table(opp_table); | |
788 | ||
789 | return opp; | |
790 | } | |
791 | EXPORT_SYMBOL_GPL(of_dev_pm_opp_find_required_opp); | |
e2f4b5f8 VK |
792 | |
793 | /** | |
794 | * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp | |
795 | * @opp: opp for which DT node has to be returned for | |
796 | * | |
797 | * Return: DT node corresponding to the opp, else 0 on success. | |
798 | * | |
799 | * The caller needs to put the node with of_node_put() after using it. | |
800 | */ | |
801 | struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp) | |
802 | { | |
803 | if (IS_ERR_OR_NULL(opp)) { | |
804 | pr_err("%s: Invalid parameters\n", __func__); | |
805 | return NULL; | |
806 | } | |
807 | ||
808 | return of_node_get(opp->np); | |
809 | } | |
810 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node); |