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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 | ||
283d55e6 | 44 | struct opp_table *_managed_opp(struct device *dev, int index) |
f47b72a1 | 45 | { |
b83c1899 | 46 | struct opp_table *opp_table, *managed_table = NULL; |
283d55e6 | 47 | struct device_node *np; |
b83c1899 | 48 | |
283d55e6 VK |
49 | np = _opp_of_get_opp_desc_node(dev->of_node, index); |
50 | if (!np) | |
51 | return NULL; | |
f47b72a1 | 52 | |
052c6f19 | 53 | list_for_each_entry(opp_table, &opp_tables, node) { |
f47b72a1 VK |
54 | if (opp_table->np == np) { |
55 | /* | |
56 | * Multiple devices can point to the same OPP table and | |
57 | * so will have same node-pointer, np. | |
58 | * | |
59 | * But the OPPs will be considered as shared only if the | |
60 | * OPP table contains a "opp-shared" property. | |
61 | */ | |
b83c1899 VK |
62 | if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) { |
63 | _get_opp_table_kref(opp_table); | |
64 | managed_table = opp_table; | |
65 | } | |
79ee2e8f | 66 | |
b83c1899 | 67 | break; |
f47b72a1 VK |
68 | } |
69 | } | |
70 | ||
283d55e6 | 71 | of_node_put(np); |
b83c1899 VK |
72 | |
73 | return managed_table; | |
f47b72a1 VK |
74 | } |
75 | ||
eb7c8743 VK |
76 | void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, |
77 | int index) | |
f47b72a1 | 78 | { |
f06ed90e VK |
79 | struct device_node *np, *opp_np; |
80 | u32 val; | |
f47b72a1 VK |
81 | |
82 | /* | |
83 | * Only required for backward compatibility with v1 bindings, but isn't | |
84 | * harmful for other cases. And so we do it unconditionally. | |
85 | */ | |
86 | np = of_node_get(dev->of_node); | |
f06ed90e VK |
87 | if (!np) |
88 | return; | |
89 | ||
90 | if (!of_property_read_u32(np, "clock-latency", &val)) | |
91 | opp_table->clock_latency_ns_max = val; | |
92 | of_property_read_u32(np, "voltage-tolerance", | |
93 | &opp_table->voltage_tolerance_v1); | |
94 | ||
61d8e7c7 VK |
95 | if (of_find_property(np, "#power-domain-cells", NULL)) |
96 | opp_table->is_genpd = true; | |
97 | ||
f06ed90e VK |
98 | /* Get OPP table node */ |
99 | opp_np = _opp_of_get_opp_desc_node(np, index); | |
100 | of_node_put(np); | |
101 | ||
102 | if (!opp_np) | |
103 | return; | |
104 | ||
105 | if (of_property_read_bool(opp_np, "opp-shared")) | |
106 | opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED; | |
107 | else | |
108 | opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE; | |
109 | ||
110 | opp_table->np = opp_np; | |
111 | ||
112 | of_node_put(opp_np); | |
f47b72a1 VK |
113 | } |
114 | ||
115 | static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, | |
116 | struct device_node *np) | |
117 | { | |
118 | unsigned int count = opp_table->supported_hw_count; | |
119 | u32 version; | |
120 | int ret; | |
121 | ||
a4ee4545 DG |
122 | if (!opp_table->supported_hw) { |
123 | /* | |
124 | * In the case that no supported_hw has been set by the | |
125 | * platform but there is an opp-supported-hw value set for | |
126 | * an OPP then the OPP should not be enabled as there is | |
127 | * no way to see if the hardware supports it. | |
128 | */ | |
129 | if (of_find_property(np, "opp-supported-hw", NULL)) | |
130 | return false; | |
131 | else | |
132 | return true; | |
133 | } | |
f47b72a1 VK |
134 | |
135 | while (count--) { | |
136 | ret = of_property_read_u32_index(np, "opp-supported-hw", count, | |
137 | &version); | |
138 | if (ret) { | |
139 | dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", | |
140 | __func__, count, ret); | |
141 | return false; | |
142 | } | |
143 | ||
144 | /* Both of these are bitwise masks of the versions */ | |
145 | if (!(version & opp_table->supported_hw[count])) | |
146 | return false; | |
147 | } | |
148 | ||
149 | return true; | |
150 | } | |
151 | ||
f47b72a1 VK |
152 | static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, |
153 | struct opp_table *opp_table) | |
154 | { | |
dfbe4678 VK |
155 | u32 *microvolt, *microamp = NULL; |
156 | int supplies, vcount, icount, ret, i, j; | |
f47b72a1 VK |
157 | struct property *prop = NULL; |
158 | char name[NAME_MAX]; | |
159 | ||
dfbe4678 VK |
160 | supplies = opp_table->regulator_count ? opp_table->regulator_count : 1; |
161 | ||
f47b72a1 VK |
162 | /* Search for "opp-microvolt-<name>" */ |
163 | if (opp_table->prop_name) { | |
164 | snprintf(name, sizeof(name), "opp-microvolt-%s", | |
165 | opp_table->prop_name); | |
166 | prop = of_find_property(opp->np, name, NULL); | |
167 | } | |
168 | ||
169 | if (!prop) { | |
170 | /* Search for "opp-microvolt" */ | |
171 | sprintf(name, "opp-microvolt"); | |
172 | prop = of_find_property(opp->np, name, NULL); | |
173 | ||
174 | /* Missing property isn't a problem, but an invalid entry is */ | |
688a48b0 VK |
175 | if (!prop) { |
176 | if (!opp_table->regulator_count) | |
177 | return 0; | |
178 | ||
179 | dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n", | |
180 | __func__); | |
181 | return -EINVAL; | |
182 | } | |
f47b72a1 VK |
183 | } |
184 | ||
dfbe4678 VK |
185 | vcount = of_property_count_u32_elems(opp->np, name); |
186 | if (vcount < 0) { | |
f47b72a1 | 187 | dev_err(dev, "%s: Invalid %s property (%d)\n", |
dfbe4678 VK |
188 | __func__, name, vcount); |
189 | return vcount; | |
f47b72a1 VK |
190 | } |
191 | ||
dfbe4678 VK |
192 | /* There can be one or three elements per supply */ |
193 | if (vcount != supplies && vcount != supplies * 3) { | |
194 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
195 | __func__, name, vcount, supplies); | |
f47b72a1 VK |
196 | return -EINVAL; |
197 | } | |
198 | ||
dfbe4678 VK |
199 | microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); |
200 | if (!microvolt) | |
201 | return -ENOMEM; | |
202 | ||
203 | ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); | |
f47b72a1 VK |
204 | if (ret) { |
205 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); | |
dfbe4678 VK |
206 | ret = -EINVAL; |
207 | goto free_microvolt; | |
f47b72a1 VK |
208 | } |
209 | ||
210 | /* Search for "opp-microamp-<name>" */ | |
211 | prop = NULL; | |
212 | if (opp_table->prop_name) { | |
213 | snprintf(name, sizeof(name), "opp-microamp-%s", | |
214 | opp_table->prop_name); | |
215 | prop = of_find_property(opp->np, name, NULL); | |
216 | } | |
217 | ||
218 | if (!prop) { | |
219 | /* Search for "opp-microamp" */ | |
220 | sprintf(name, "opp-microamp"); | |
221 | prop = of_find_property(opp->np, name, NULL); | |
222 | } | |
223 | ||
dfbe4678 VK |
224 | if (prop) { |
225 | icount = of_property_count_u32_elems(opp->np, name); | |
226 | if (icount < 0) { | |
227 | dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, | |
228 | name, icount); | |
229 | ret = icount; | |
230 | goto free_microvolt; | |
231 | } | |
f47b72a1 | 232 | |
dfbe4678 VK |
233 | if (icount != supplies) { |
234 | dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", | |
235 | __func__, name, icount, supplies); | |
236 | ret = -EINVAL; | |
237 | goto free_microvolt; | |
238 | } | |
239 | ||
240 | microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); | |
241 | if (!microamp) { | |
242 | ret = -EINVAL; | |
243 | goto free_microvolt; | |
244 | } | |
245 | ||
246 | ret = of_property_read_u32_array(opp->np, name, microamp, | |
247 | icount); | |
248 | if (ret) { | |
249 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, | |
250 | name, ret); | |
251 | ret = -EINVAL; | |
252 | goto free_microamp; | |
253 | } | |
254 | } | |
255 | ||
256 | for (i = 0, j = 0; i < supplies; i++) { | |
257 | opp->supplies[i].u_volt = microvolt[j++]; | |
258 | ||
259 | if (vcount == supplies) { | |
260 | opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; | |
261 | opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; | |
262 | } else { | |
263 | opp->supplies[i].u_volt_min = microvolt[j++]; | |
264 | opp->supplies[i].u_volt_max = microvolt[j++]; | |
265 | } | |
266 | ||
267 | if (microamp) | |
268 | opp->supplies[i].u_amp = microamp[i]; | |
269 | } | |
270 | ||
271 | free_microamp: | |
272 | kfree(microamp); | |
273 | free_microvolt: | |
274 | kfree(microvolt); | |
275 | ||
276 | return ret; | |
f47b72a1 VK |
277 | } |
278 | ||
279 | /** | |
280 | * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT | |
281 | * entries | |
282 | * @dev: device pointer used to lookup OPP table. | |
283 | * | |
284 | * Free OPPs created using static entries present in DT. | |
f47b72a1 VK |
285 | */ |
286 | void dev_pm_opp_of_remove_table(struct device *dev) | |
287 | { | |
2a4eb735 | 288 | _dev_pm_opp_find_and_remove_table(dev); |
f47b72a1 VK |
289 | } |
290 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); | |
291 | ||
f47b72a1 VK |
292 | /** |
293 | * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) | |
8cd2f6e8 | 294 | * @opp_table: OPP table |
f47b72a1 VK |
295 | * @dev: device for which we do this operation |
296 | * @np: device node | |
297 | * | |
298 | * This function adds an opp definition to the opp table and returns status. The | |
299 | * opp can be controlled using dev_pm_opp_enable/disable functions and may be | |
300 | * removed by dev_pm_opp_remove. | |
301 | * | |
f47b72a1 | 302 | * Return: |
deac8703 DG |
303 | * Valid OPP pointer: |
304 | * On success | |
305 | * NULL: | |
f47b72a1 | 306 | * Duplicate OPPs (both freq and volt are same) and opp->available |
deac8703 DG |
307 | * OR if the OPP is not supported by hardware. |
308 | * ERR_PTR(-EEXIST): | |
309 | * Freq are same and volt are different OR | |
f47b72a1 | 310 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
deac8703 DG |
311 | * ERR_PTR(-ENOMEM): |
312 | * Memory allocation failure | |
313 | * ERR_PTR(-EINVAL): | |
314 | * Failed parsing the OPP node | |
f47b72a1 | 315 | */ |
deac8703 DG |
316 | static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table, |
317 | struct device *dev, struct device_node *np) | |
f47b72a1 | 318 | { |
f47b72a1 | 319 | struct dev_pm_opp *new_opp; |
6a89e012 | 320 | u64 rate = 0; |
f47b72a1 VK |
321 | u32 val; |
322 | int ret; | |
a1e8c136 | 323 | bool rate_not_available = false; |
f47b72a1 | 324 | |
8cd2f6e8 VK |
325 | new_opp = _opp_allocate(opp_table); |
326 | if (!new_opp) | |
deac8703 | 327 | return ERR_PTR(-ENOMEM); |
f47b72a1 VK |
328 | |
329 | ret = of_property_read_u64(np, "opp-hz", &rate); | |
330 | if (ret < 0) { | |
a1e8c136 | 331 | /* "opp-hz" is optional for devices like power domains. */ |
61d8e7c7 | 332 | if (!opp_table->is_genpd) { |
a1e8c136 VK |
333 | dev_err(dev, "%s: opp-hz not found\n", __func__); |
334 | goto free_opp; | |
335 | } | |
336 | ||
337 | rate_not_available = true; | |
338 | } else { | |
339 | /* | |
340 | * Rate is defined as an unsigned long in clk API, and so | |
341 | * casting explicitly to its type. Must be fixed once rate is 64 | |
342 | * bit guaranteed in clk API. | |
343 | */ | |
344 | new_opp->rate = (unsigned long)rate; | |
f47b72a1 VK |
345 | } |
346 | ||
347 | /* Check if the OPP supports hardware's hierarchy of versions or not */ | |
348 | if (!_opp_is_supported(dev, opp_table, np)) { | |
349 | dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); | |
350 | goto free_opp; | |
351 | } | |
352 | ||
f47b72a1 VK |
353 | new_opp->turbo = of_property_read_bool(np, "turbo-mode"); |
354 | ||
355 | new_opp->np = np; | |
356 | new_opp->dynamic = false; | |
357 | new_opp->available = true; | |
358 | ||
359 | if (!of_property_read_u32(np, "clock-latency-ns", &val)) | |
360 | new_opp->clock_latency_ns = val; | |
361 | ||
3ba98324 VK |
362 | new_opp->pstate = of_genpd_opp_to_performance_state(dev, np); |
363 | ||
f47b72a1 VK |
364 | ret = opp_parse_supplies(new_opp, dev, opp_table); |
365 | if (ret) | |
366 | goto free_opp; | |
367 | ||
a1e8c136 | 368 | ret = _opp_add(dev, new_opp, opp_table, rate_not_available); |
7f8538eb VK |
369 | if (ret) { |
370 | /* Don't return error for duplicate OPPs */ | |
371 | if (ret == -EBUSY) | |
372 | ret = 0; | |
f47b72a1 | 373 | goto free_opp; |
7f8538eb | 374 | } |
f47b72a1 VK |
375 | |
376 | /* OPP to select on device suspend */ | |
377 | if (of_property_read_bool(np, "opp-suspend")) { | |
378 | if (opp_table->suspend_opp) { | |
379 | dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n", | |
380 | __func__, opp_table->suspend_opp->rate, | |
381 | new_opp->rate); | |
382 | } else { | |
383 | new_opp->suspend = true; | |
384 | opp_table->suspend_opp = new_opp; | |
385 | } | |
386 | } | |
387 | ||
388 | if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) | |
389 | opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; | |
390 | ||
f47b72a1 | 391 | pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", |
0f0fe7e0 | 392 | __func__, new_opp->turbo, new_opp->rate, |
dfbe4678 VK |
393 | new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, |
394 | new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns); | |
f47b72a1 VK |
395 | |
396 | /* | |
397 | * Notify the changes in the availability of the operable | |
398 | * frequency/voltage list. | |
399 | */ | |
052c6f19 | 400 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
deac8703 | 401 | return new_opp; |
f47b72a1 VK |
402 | |
403 | free_opp: | |
8cd2f6e8 VK |
404 | _opp_free(new_opp); |
405 | ||
deac8703 | 406 | return ERR_PTR(ret); |
f47b72a1 VK |
407 | } |
408 | ||
409 | /* Initializes OPP tables based on new bindings */ | |
5ed4cecd | 410 | static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table) |
f47b72a1 VK |
411 | { |
412 | struct device_node *np; | |
283d55e6 | 413 | int ret, count = 0, pstate_count = 0; |
3ba98324 | 414 | struct dev_pm_opp *opp; |
f47b72a1 | 415 | |
283d55e6 VK |
416 | /* OPP table is already initialized for the device */ |
417 | if (opp_table->parsed_static_opps) { | |
418 | kref_get(&opp_table->list_kref); | |
419 | return 0; | |
420 | } | |
421 | ||
d0e8ae6c VK |
422 | kref_init(&opp_table->list_kref); |
423 | ||
f47b72a1 | 424 | /* We have opp-table node now, iterate over it and add OPPs */ |
5ed4cecd | 425 | for_each_available_child_of_node(opp_table->np, np) { |
deac8703 DG |
426 | opp = _opp_add_static_v2(opp_table, dev, np); |
427 | if (IS_ERR(opp)) { | |
428 | ret = PTR_ERR(opp); | |
f47b72a1 VK |
429 | dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, |
430 | ret); | |
7978db34 | 431 | of_node_put(np); |
cdd6ed90 | 432 | goto put_list_kref; |
deac8703 DG |
433 | } else if (opp) { |
434 | count++; | |
f47b72a1 VK |
435 | } |
436 | } | |
437 | ||
438 | /* There should be one of more OPP defined */ | |
8cd2f6e8 VK |
439 | if (WARN_ON(!count)) { |
440 | ret = -ENOENT; | |
cdd6ed90 | 441 | goto put_list_kref; |
f47b72a1 VK |
442 | } |
443 | ||
3ba98324 VK |
444 | list_for_each_entry(opp, &opp_table->opp_list, node) |
445 | pstate_count += !!opp->pstate; | |
446 | ||
447 | /* Either all or none of the nodes shall have performance state set */ | |
448 | if (pstate_count && pstate_count != count) { | |
449 | dev_err(dev, "Not all nodes have performance state set (%d: %d)\n", | |
450 | count, pstate_count); | |
451 | ret = -ENOENT; | |
cdd6ed90 | 452 | goto put_list_kref; |
3ba98324 VK |
453 | } |
454 | ||
455 | if (pstate_count) | |
456 | opp_table->genpd_performance_state = true; | |
457 | ||
f06ed90e | 458 | opp_table->parsed_static_opps = true; |
f47b72a1 | 459 | |
cdd6ed90 VK |
460 | return 0; |
461 | ||
462 | put_list_kref: | |
463 | _put_opp_list_kref(opp_table); | |
f47b72a1 VK |
464 | |
465 | return ret; | |
466 | } | |
467 | ||
468 | /* Initializes OPP tables based on old-deprecated bindings */ | |
5ed4cecd | 469 | static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table) |
f47b72a1 VK |
470 | { |
471 | const struct property *prop; | |
472 | const __be32 *val; | |
8cd2f6e8 | 473 | int nr, ret = 0; |
f47b72a1 VK |
474 | |
475 | prop = of_find_property(dev->of_node, "operating-points", NULL); | |
476 | if (!prop) | |
477 | return -ENODEV; | |
478 | if (!prop->value) | |
479 | return -ENODATA; | |
480 | ||
481 | /* | |
482 | * Each OPP is a set of tuples consisting of frequency and | |
483 | * voltage like <freq-kHz vol-uV>. | |
484 | */ | |
485 | nr = prop->length / sizeof(u32); | |
486 | if (nr % 2) { | |
487 | dev_err(dev, "%s: Invalid OPP table\n", __func__); | |
488 | return -EINVAL; | |
489 | } | |
490 | ||
d0e8ae6c VK |
491 | kref_init(&opp_table->list_kref); |
492 | ||
f47b72a1 VK |
493 | val = prop->value; |
494 | while (nr) { | |
495 | unsigned long freq = be32_to_cpup(val++) * 1000; | |
496 | unsigned long volt = be32_to_cpup(val++); | |
497 | ||
8cd2f6e8 | 498 | ret = _opp_add_v1(opp_table, dev, freq, volt, false); |
04a86a84 VK |
499 | if (ret) { |
500 | dev_err(dev, "%s: Failed to add OPP %ld (%d)\n", | |
501 | __func__, freq, ret); | |
cdd6ed90 | 502 | _put_opp_list_kref(opp_table); |
cdd6ed90 | 503 | return ret; |
04a86a84 | 504 | } |
f47b72a1 VK |
505 | nr -= 2; |
506 | } | |
507 | ||
8cd2f6e8 | 508 | return ret; |
f47b72a1 VK |
509 | } |
510 | ||
511 | /** | |
512 | * dev_pm_opp_of_add_table() - Initialize opp table from device tree | |
513 | * @dev: device pointer used to lookup OPP table. | |
514 | * | |
515 | * Register the initial OPP table with the OPP library for given device. | |
516 | * | |
f47b72a1 VK |
517 | * Return: |
518 | * 0 On success OR | |
519 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
520 | * -EEXIST Freq are same and volt are different OR | |
521 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
522 | * -ENOMEM Memory allocation failure | |
523 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
524 | * in device node. | |
525 | * -ENODATA when empty 'operating-points' property is found | |
526 | * -EINVAL when invalid entries are found in opp-v2 table | |
527 | */ | |
528 | int dev_pm_opp_of_add_table(struct device *dev) | |
529 | { | |
5ed4cecd | 530 | struct opp_table *opp_table; |
f47b72a1 VK |
531 | int ret; |
532 | ||
5ed4cecd VK |
533 | opp_table = dev_pm_opp_get_opp_table_indexed(dev, 0); |
534 | if (!opp_table) | |
535 | return -ENOMEM; | |
536 | ||
f47b72a1 | 537 | /* |
5ed4cecd VK |
538 | * OPPs have two version of bindings now. Also try the old (v1) |
539 | * bindings for backward compatibility with older dtbs. | |
f47b72a1 | 540 | */ |
5ed4cecd VK |
541 | if (opp_table->np) |
542 | ret = _of_add_opp_table_v2(dev, opp_table); | |
543 | else | |
544 | ret = _of_add_opp_table_v1(dev, opp_table); | |
f47b72a1 | 545 | |
5ed4cecd VK |
546 | if (ret) |
547 | dev_pm_opp_put_opp_table(opp_table); | |
f47b72a1 VK |
548 | |
549 | return ret; | |
550 | } | |
551 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); | |
552 | ||
fa9b274f VK |
553 | /** |
554 | * dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree | |
555 | * @dev: device pointer used to lookup OPP table. | |
556 | * @index: Index number. | |
557 | * | |
558 | * Register the initial OPP table with the OPP library for given device only | |
559 | * using the "operating-points-v2" property. | |
560 | * | |
561 | * Return: | |
562 | * 0 On success OR | |
563 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
564 | * -EEXIST Freq are same and volt are different OR | |
565 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
566 | * -ENOMEM Memory allocation failure | |
567 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
568 | * in device node. | |
569 | * -ENODATA when empty 'operating-points' property is found | |
570 | * -EINVAL when invalid entries are found in opp-v2 table | |
571 | */ | |
572 | int dev_pm_opp_of_add_table_indexed(struct device *dev, int index) | |
573 | { | |
5ed4cecd | 574 | struct opp_table *opp_table; |
8a352fd8 | 575 | int ret, count; |
fa9b274f | 576 | |
5ed4cecd | 577 | if (index) { |
8a352fd8 VK |
578 | /* |
579 | * If only one phandle is present, then the same OPP table | |
580 | * applies for all index requests. | |
581 | */ | |
582 | count = of_count_phandle_with_args(dev->of_node, | |
583 | "operating-points-v2", NULL); | |
5ed4cecd VK |
584 | if (count != 1) |
585 | return -ENODEV; | |
8a352fd8 | 586 | |
5ed4cecd | 587 | index = 0; |
8a352fd8 | 588 | } |
fa9b274f | 589 | |
5ed4cecd VK |
590 | opp_table = dev_pm_opp_get_opp_table_indexed(dev, index); |
591 | if (!opp_table) | |
592 | return -ENOMEM; | |
593 | ||
594 | ret = _of_add_opp_table_v2(dev, opp_table); | |
595 | if (ret) | |
596 | dev_pm_opp_put_opp_table(opp_table); | |
fa9b274f VK |
597 | |
598 | return ret; | |
599 | } | |
600 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed); | |
601 | ||
f47b72a1 VK |
602 | /* CPU device specific helpers */ |
603 | ||
604 | /** | |
605 | * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask | |
606 | * @cpumask: cpumask for which OPP table needs to be removed | |
607 | * | |
608 | * This removes the OPP tables for CPUs present in the @cpumask. | |
609 | * This should be used only to remove static entries created from DT. | |
f47b72a1 VK |
610 | */ |
611 | void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) | |
612 | { | |
2a4eb735 | 613 | _dev_pm_opp_cpumask_remove_table(cpumask, -1); |
f47b72a1 VK |
614 | } |
615 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); | |
616 | ||
617 | /** | |
618 | * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask | |
619 | * @cpumask: cpumask for which OPP table needs to be added. | |
620 | * | |
621 | * This adds the OPP tables for CPUs present in the @cpumask. | |
f47b72a1 VK |
622 | */ |
623 | int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) | |
624 | { | |
625 | struct device *cpu_dev; | |
50b6b87c | 626 | int cpu, ret; |
f47b72a1 | 627 | |
50b6b87c VK |
628 | if (WARN_ON(cpumask_empty(cpumask))) |
629 | return -ENODEV; | |
f47b72a1 VK |
630 | |
631 | for_each_cpu(cpu, cpumask) { | |
632 | cpu_dev = get_cpu_device(cpu); | |
633 | if (!cpu_dev) { | |
634 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
635 | cpu); | |
50b6b87c VK |
636 | ret = -ENODEV; |
637 | goto remove_table; | |
f47b72a1 VK |
638 | } |
639 | ||
640 | ret = dev_pm_opp_of_add_table(cpu_dev); | |
641 | if (ret) { | |
5b60697c VK |
642 | /* |
643 | * OPP may get registered dynamically, don't print error | |
644 | * message here. | |
645 | */ | |
646 | pr_debug("%s: couldn't find opp table for cpu:%d, %d\n", | |
647 | __func__, cpu, ret); | |
f47b72a1 | 648 | |
50b6b87c | 649 | goto remove_table; |
f47b72a1 VK |
650 | } |
651 | } | |
652 | ||
50b6b87c VK |
653 | return 0; |
654 | ||
655 | remove_table: | |
656 | /* Free all other OPPs */ | |
657 | _dev_pm_opp_cpumask_remove_table(cpumask, cpu); | |
658 | ||
f47b72a1 VK |
659 | return ret; |
660 | } | |
661 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); | |
662 | ||
663 | /* | |
664 | * Works only for OPP v2 bindings. | |
665 | * | |
666 | * Returns -ENOENT if operating-points-v2 bindings aren't supported. | |
667 | */ | |
668 | /** | |
669 | * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with | |
670 | * @cpu_dev using operating-points-v2 | |
671 | * bindings. | |
672 | * | |
673 | * @cpu_dev: CPU device for which we do this operation | |
674 | * @cpumask: cpumask to update with information of sharing CPUs | |
675 | * | |
676 | * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. | |
677 | * | |
678 | * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. | |
f47b72a1 VK |
679 | */ |
680 | int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, | |
681 | struct cpumask *cpumask) | |
682 | { | |
76279291 | 683 | struct device_node *np, *tmp_np, *cpu_np; |
f47b72a1 VK |
684 | int cpu, ret = 0; |
685 | ||
686 | /* Get OPP descriptor node */ | |
0764c604 | 687 | np = dev_pm_opp_of_get_opp_desc_node(cpu_dev); |
f47b72a1 | 688 | if (!np) { |
349aa92e | 689 | dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__); |
f47b72a1 VK |
690 | return -ENOENT; |
691 | } | |
692 | ||
693 | cpumask_set_cpu(cpu_dev->id, cpumask); | |
694 | ||
695 | /* OPPs are shared ? */ | |
696 | if (!of_property_read_bool(np, "opp-shared")) | |
697 | goto put_cpu_node; | |
698 | ||
699 | for_each_possible_cpu(cpu) { | |
700 | if (cpu == cpu_dev->id) | |
701 | continue; | |
702 | ||
9867999f | 703 | cpu_np = of_cpu_device_node_get(cpu); |
76279291 WR |
704 | if (!cpu_np) { |
705 | dev_err(cpu_dev, "%s: failed to get cpu%d node\n", | |
f47b72a1 | 706 | __func__, cpu); |
76279291 | 707 | ret = -ENOENT; |
f47b72a1 VK |
708 | goto put_cpu_node; |
709 | } | |
710 | ||
711 | /* Get OPP descriptor node */ | |
fa9b274f | 712 | tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0); |
9867999f | 713 | of_node_put(cpu_np); |
f47b72a1 | 714 | if (!tmp_np) { |
76279291 | 715 | pr_err("%pOF: Couldn't find opp node\n", cpu_np); |
f47b72a1 VK |
716 | ret = -ENOENT; |
717 | goto put_cpu_node; | |
718 | } | |
719 | ||
720 | /* CPUs are sharing opp node */ | |
721 | if (np == tmp_np) | |
722 | cpumask_set_cpu(cpu, cpumask); | |
723 | ||
724 | of_node_put(tmp_np); | |
725 | } | |
726 | ||
727 | put_cpu_node: | |
728 | of_node_put(np); | |
729 | return ret; | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); | |
a88bd2a5 VK |
732 | |
733 | /** | |
734 | * of_dev_pm_opp_find_required_opp() - Search for required OPP. | |
735 | * @dev: The device whose OPP node is referenced by the 'np' DT node. | |
736 | * @np: Node that contains the "required-opps" property. | |
737 | * | |
738 | * Returns the OPP of the device 'dev', whose phandle is present in the "np" | |
739 | * node. Although the "required-opps" property supports having multiple | |
740 | * phandles, this helper routine only parses the very first phandle in the list. | |
741 | * | |
742 | * Return: Matching opp, else returns ERR_PTR in case of error and should be | |
743 | * handled using IS_ERR. | |
744 | * | |
745 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
746 | * use. | |
747 | */ | |
748 | struct dev_pm_opp *of_dev_pm_opp_find_required_opp(struct device *dev, | |
749 | struct device_node *np) | |
750 | { | |
751 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ENODEV); | |
752 | struct device_node *required_np; | |
753 | struct opp_table *opp_table; | |
754 | ||
755 | opp_table = _find_opp_table(dev); | |
756 | if (IS_ERR(opp_table)) | |
757 | return ERR_CAST(opp_table); | |
758 | ||
759 | required_np = of_parse_phandle(np, "required-opps", 0); | |
760 | if (unlikely(!required_np)) { | |
761 | dev_err(dev, "Unable to parse required-opps\n"); | |
762 | goto put_opp_table; | |
763 | } | |
764 | ||
765 | mutex_lock(&opp_table->lock); | |
766 | ||
767 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
768 | if (temp_opp->available && temp_opp->np == required_np) { | |
769 | opp = temp_opp; | |
770 | ||
771 | /* Increment the reference count of OPP */ | |
772 | dev_pm_opp_get(opp); | |
773 | break; | |
774 | } | |
775 | } | |
776 | ||
777 | mutex_unlock(&opp_table->lock); | |
778 | ||
779 | of_node_put(required_np); | |
780 | put_opp_table: | |
781 | dev_pm_opp_put_opp_table(opp_table); | |
782 | ||
783 | return opp; | |
784 | } | |
785 | EXPORT_SYMBOL_GPL(of_dev_pm_opp_find_required_opp); | |
e2f4b5f8 VK |
786 | |
787 | /** | |
788 | * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp | |
789 | * @opp: opp for which DT node has to be returned for | |
790 | * | |
791 | * Return: DT node corresponding to the opp, else 0 on success. | |
792 | * | |
793 | * The caller needs to put the node with of_node_put() after using it. | |
794 | */ | |
795 | struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp) | |
796 | { | |
797 | if (IS_ERR_OR_NULL(opp)) { | |
798 | pr_err("%s: Invalid parameters\n", __func__); | |
799 | return NULL; | |
800 | } | |
801 | ||
802 | return of_node_get(opp->np); | |
803 | } | |
804 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node); |