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e1f60b29 NM |
1 | /* |
2 | * Generic OPP Interface | |
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 | ||
d6d2a528 VK |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
e1f60b29 NM |
16 | #include <linux/errno.h> |
17 | #include <linux/err.h> | |
e1f60b29 | 18 | #include <linux/slab.h> |
51990e82 | 19 | #include <linux/device.h> |
b496dfbc | 20 | #include <linux/of.h> |
80126ce7 | 21 | #include <linux/export.h> |
e1f60b29 | 22 | |
f59d3ee8 | 23 | #include "opp.h" |
e1f60b29 NM |
24 | |
25 | /* | |
26 | * The root of the list of all devices. All device_opp structures branch off | |
27 | * from here, with each device_opp containing the list of opp it supports in | |
28 | * various states of availability. | |
29 | */ | |
30 | static LIST_HEAD(dev_opp_list); | |
31 | /* Lock to allow exclusive modification to the device and opp lists */ | |
87b4115d | 32 | DEFINE_MUTEX(dev_opp_list_lock); |
e1f60b29 | 33 | |
b02ded24 DT |
34 | #define opp_rcu_lockdep_assert() \ |
35 | do { \ | |
f78f5b90 PM |
36 | RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \ |
37 | !lockdep_is_held(&dev_opp_list_lock), \ | |
b02ded24 DT |
38 | "Missing rcu_read_lock() or " \ |
39 | "dev_opp_list_lock protection"); \ | |
40 | } while (0) | |
41 | ||
06441658 VK |
42 | static struct device_list_opp *_find_list_dev(const struct device *dev, |
43 | struct device_opp *dev_opp) | |
44 | { | |
45 | struct device_list_opp *list_dev; | |
46 | ||
47 | list_for_each_entry(list_dev, &dev_opp->dev_list, node) | |
48 | if (list_dev->dev == dev) | |
49 | return list_dev; | |
50 | ||
51 | return NULL; | |
52 | } | |
53 | ||
54 | static struct device_opp *_managed_opp(const struct device_node *np) | |
55 | { | |
56 | struct device_opp *dev_opp; | |
57 | ||
58 | list_for_each_entry_rcu(dev_opp, &dev_opp_list, node) { | |
59 | if (dev_opp->np == np) { | |
60 | /* | |
61 | * Multiple devices can point to the same OPP table and | |
62 | * so will have same node-pointer, np. | |
63 | * | |
64 | * But the OPPs will be considered as shared only if the | |
65 | * OPP table contains a "opp-shared" property. | |
66 | */ | |
67 | return dev_opp->shared_opp ? dev_opp : NULL; | |
68 | } | |
69 | } | |
70 | ||
71 | return NULL; | |
72 | } | |
73 | ||
e1f60b29 | 74 | /** |
327854c8 | 75 | * _find_device_opp() - find device_opp struct using device pointer |
e1f60b29 NM |
76 | * @dev: device pointer used to lookup device OPPs |
77 | * | |
78 | * Search list of device OPPs for one containing matching device. Does a RCU | |
79 | * reader operation to grab the pointer needed. | |
80 | * | |
984f16c8 | 81 | * Return: pointer to 'struct device_opp' if found, otherwise -ENODEV or |
e1f60b29 NM |
82 | * -EINVAL based on type of error. |
83 | * | |
0597e818 VK |
84 | * Locking: For readers, this function must be called under rcu_read_lock(). |
85 | * device_opp is a RCU protected pointer, which means that device_opp is valid | |
86 | * as long as we are under RCU lock. | |
87 | * | |
88 | * For Writers, this function must be called with dev_opp_list_lock held. | |
e1f60b29 | 89 | */ |
f59d3ee8 | 90 | struct device_opp *_find_device_opp(struct device *dev) |
e1f60b29 | 91 | { |
06441658 | 92 | struct device_opp *dev_opp; |
e1f60b29 | 93 | |
0597e818 VK |
94 | opp_rcu_lockdep_assert(); |
95 | ||
50a3cb04 | 96 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
97 | pr_err("%s: Invalid parameters\n", __func__); |
98 | return ERR_PTR(-EINVAL); | |
99 | } | |
100 | ||
06441658 VK |
101 | list_for_each_entry_rcu(dev_opp, &dev_opp_list, node) |
102 | if (_find_list_dev(dev, dev_opp)) | |
103 | return dev_opp; | |
e1f60b29 | 104 | |
06441658 | 105 | return ERR_PTR(-ENODEV); |
e1f60b29 NM |
106 | } |
107 | ||
108 | /** | |
d6d00742 | 109 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
110 | * @opp: opp for which voltage has to be returned for |
111 | * | |
984f16c8 | 112 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
113 | * return 0 |
114 | * | |
115 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
116 | * protected pointer. This means that opp which could have been fetched by | |
117 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
118 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
119 | * used in the same section as the usage of this function with the pointer | |
120 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
121 | * pointer. | |
122 | */ | |
47d43ba7 | 123 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 124 | { |
47d43ba7 | 125 | struct dev_pm_opp *tmp_opp; |
e1f60b29 NM |
126 | unsigned long v = 0; |
127 | ||
04bf1c7f KK |
128 | opp_rcu_lockdep_assert(); |
129 | ||
e1f60b29 | 130 | tmp_opp = rcu_dereference(opp); |
d6d00742 | 131 | if (IS_ERR_OR_NULL(tmp_opp)) |
e1f60b29 NM |
132 | pr_err("%s: Invalid parameters\n", __func__); |
133 | else | |
134 | v = tmp_opp->u_volt; | |
135 | ||
136 | return v; | |
137 | } | |
5d4879cd | 138 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
139 | |
140 | /** | |
5d4879cd | 141 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
142 | * @opp: opp for which frequency has to be returned for |
143 | * | |
984f16c8 | 144 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 NM |
145 | * return 0 |
146 | * | |
147 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
148 | * protected pointer. This means that opp which could have been fetched by | |
149 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
150 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
151 | * used in the same section as the usage of this function with the pointer | |
152 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
153 | * pointer. | |
154 | */ | |
47d43ba7 | 155 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 156 | { |
47d43ba7 | 157 | struct dev_pm_opp *tmp_opp; |
e1f60b29 NM |
158 | unsigned long f = 0; |
159 | ||
04bf1c7f KK |
160 | opp_rcu_lockdep_assert(); |
161 | ||
e1f60b29 | 162 | tmp_opp = rcu_dereference(opp); |
50a3cb04 | 163 | if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available) |
e1f60b29 NM |
164 | pr_err("%s: Invalid parameters\n", __func__); |
165 | else | |
166 | f = tmp_opp->rate; | |
167 | ||
168 | return f; | |
169 | } | |
5d4879cd | 170 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 171 | |
19445b25 BZ |
172 | /** |
173 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
174 | * @opp: opp for which turbo mode is being verified | |
175 | * | |
176 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
177 | * conditions) for short duration of times to finish high throughput work | |
178 | * quickly. Running on them for longer times may overheat the chip. | |
179 | * | |
180 | * Return: true if opp is turbo opp, else false. | |
181 | * | |
182 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
183 | * protected pointer. This means that opp which could have been fetched by | |
184 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
185 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
186 | * used in the same section as the usage of this function with the pointer | |
187 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
188 | * pointer. | |
189 | */ | |
190 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
191 | { | |
192 | struct dev_pm_opp *tmp_opp; | |
193 | ||
194 | opp_rcu_lockdep_assert(); | |
195 | ||
196 | tmp_opp = rcu_dereference(opp); | |
197 | if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available) { | |
198 | pr_err("%s: Invalid parameters\n", __func__); | |
199 | return false; | |
200 | } | |
201 | ||
202 | return tmp_opp->turbo; | |
203 | } | |
204 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
205 | ||
3ca9bb33 VK |
206 | /** |
207 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
208 | * @dev: device for which we do this operation | |
209 | * | |
210 | * Return: This function returns the max clock latency in nanoseconds. | |
211 | * | |
212 | * Locking: This function takes rcu_read_lock(). | |
213 | */ | |
214 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
215 | { | |
216 | struct device_opp *dev_opp; | |
217 | unsigned long clock_latency_ns; | |
218 | ||
219 | rcu_read_lock(); | |
220 | ||
221 | dev_opp = _find_device_opp(dev); | |
222 | if (IS_ERR(dev_opp)) | |
223 | clock_latency_ns = 0; | |
224 | else | |
225 | clock_latency_ns = dev_opp->clock_latency_ns_max; | |
226 | ||
227 | rcu_read_unlock(); | |
228 | return clock_latency_ns; | |
229 | } | |
230 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
231 | ||
4eafbd15 BZ |
232 | /** |
233 | * dev_pm_opp_get_suspend_opp() - Get suspend opp | |
234 | * @dev: device for which we do this operation | |
235 | * | |
236 | * Return: This function returns pointer to the suspend opp if it is | |
1b2b90cb | 237 | * defined and available, otherwise it returns NULL. |
4eafbd15 BZ |
238 | * |
239 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
240 | * protected pointer. The reason for the same is that the opp pointer which is | |
241 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
242 | * under the locked area. The pointer returned must be used prior to unlocking | |
243 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
244 | */ | |
245 | struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev) | |
246 | { | |
247 | struct device_opp *dev_opp; | |
4eafbd15 BZ |
248 | |
249 | opp_rcu_lockdep_assert(); | |
250 | ||
251 | dev_opp = _find_device_opp(dev); | |
1b2b90cb VK |
252 | if (IS_ERR(dev_opp) || !dev_opp->suspend_opp || |
253 | !dev_opp->suspend_opp->available) | |
254 | return NULL; | |
4eafbd15 | 255 | |
1b2b90cb | 256 | return dev_opp->suspend_opp; |
4eafbd15 BZ |
257 | } |
258 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp); | |
259 | ||
e1f60b29 | 260 | /** |
5d4879cd | 261 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp list |
e1f60b29 NM |
262 | * @dev: device for which we do this operation |
263 | * | |
984f16c8 | 264 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 NM |
265 | * else returns 0 if none or the corresponding error value. |
266 | * | |
b4718c02 | 267 | * Locking: This function takes rcu_read_lock(). |
e1f60b29 | 268 | */ |
5d4879cd | 269 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 NM |
270 | { |
271 | struct device_opp *dev_opp; | |
47d43ba7 | 272 | struct dev_pm_opp *temp_opp; |
e1f60b29 NM |
273 | int count = 0; |
274 | ||
b4718c02 | 275 | rcu_read_lock(); |
b02ded24 | 276 | |
327854c8 | 277 | dev_opp = _find_device_opp(dev); |
e1f60b29 | 278 | if (IS_ERR(dev_opp)) { |
b4718c02 DT |
279 | count = PTR_ERR(dev_opp); |
280 | dev_err(dev, "%s: device OPP not found (%d)\n", | |
281 | __func__, count); | |
282 | goto out_unlock; | |
e1f60b29 NM |
283 | } |
284 | ||
285 | list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) { | |
286 | if (temp_opp->available) | |
287 | count++; | |
288 | } | |
289 | ||
b4718c02 DT |
290 | out_unlock: |
291 | rcu_read_unlock(); | |
e1f60b29 NM |
292 | return count; |
293 | } | |
5d4879cd | 294 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
295 | |
296 | /** | |
5d4879cd | 297 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
298 | * @dev: device for which we do this operation |
299 | * @freq: frequency to search for | |
7ae49618 | 300 | * @available: true/false - match for available opp |
e1f60b29 | 301 | * |
984f16c8 NM |
302 | * Return: Searches for exact match in the opp list and returns pointer to the |
303 | * matching opp if found, else returns ERR_PTR in case of error and should | |
304 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
305 | * EINVAL: for bad pointer |
306 | * ERANGE: no match found for search | |
307 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
308 | * |
309 | * Note: available is a modifier for the search. if available=true, then the | |
310 | * match is for exact matching frequency and is available in the stored OPP | |
311 | * table. if false, the match is for exact frequency which is not available. | |
312 | * | |
313 | * This provides a mechanism to enable an opp which is not available currently | |
314 | * or the opposite as well. | |
315 | * | |
316 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
317 | * protected pointer. The reason for the same is that the opp pointer which is | |
318 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
319 | * under the locked area. The pointer returned must be used prior to unlocking | |
320 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
321 | */ | |
47d43ba7 NM |
322 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
323 | unsigned long freq, | |
324 | bool available) | |
e1f60b29 NM |
325 | { |
326 | struct device_opp *dev_opp; | |
47d43ba7 | 327 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 328 | |
b02ded24 DT |
329 | opp_rcu_lockdep_assert(); |
330 | ||
327854c8 | 331 | dev_opp = _find_device_opp(dev); |
e1f60b29 NM |
332 | if (IS_ERR(dev_opp)) { |
333 | int r = PTR_ERR(dev_opp); | |
334 | dev_err(dev, "%s: device OPP not found (%d)\n", __func__, r); | |
335 | return ERR_PTR(r); | |
336 | } | |
337 | ||
338 | list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) { | |
339 | if (temp_opp->available == available && | |
340 | temp_opp->rate == freq) { | |
341 | opp = temp_opp; | |
342 | break; | |
343 | } | |
344 | } | |
345 | ||
346 | return opp; | |
347 | } | |
5d4879cd | 348 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 NM |
349 | |
350 | /** | |
5d4879cd | 351 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
352 | * @dev: device for which we do this operation |
353 | * @freq: Start frequency | |
354 | * | |
355 | * Search for the matching ceil *available* OPP from a starting freq | |
356 | * for a device. | |
357 | * | |
984f16c8 | 358 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
359 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
360 | * values can be: | |
361 | * EINVAL: for bad pointer | |
362 | * ERANGE: no match found for search | |
363 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
364 | * |
365 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
366 | * protected pointer. The reason for the same is that the opp pointer which is | |
367 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
368 | * under the locked area. The pointer returned must be used prior to unlocking | |
369 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
370 | */ | |
47d43ba7 NM |
371 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
372 | unsigned long *freq) | |
e1f60b29 NM |
373 | { |
374 | struct device_opp *dev_opp; | |
47d43ba7 | 375 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 376 | |
b02ded24 DT |
377 | opp_rcu_lockdep_assert(); |
378 | ||
e1f60b29 NM |
379 | if (!dev || !freq) { |
380 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
381 | return ERR_PTR(-EINVAL); | |
382 | } | |
383 | ||
327854c8 | 384 | dev_opp = _find_device_opp(dev); |
e1f60b29 | 385 | if (IS_ERR(dev_opp)) |
0779726c | 386 | return ERR_CAST(dev_opp); |
e1f60b29 NM |
387 | |
388 | list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) { | |
389 | if (temp_opp->available && temp_opp->rate >= *freq) { | |
390 | opp = temp_opp; | |
391 | *freq = opp->rate; | |
392 | break; | |
393 | } | |
394 | } | |
395 | ||
396 | return opp; | |
397 | } | |
5d4879cd | 398 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
399 | |
400 | /** | |
5d4879cd | 401 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
402 | * @dev: device for which we do this operation |
403 | * @freq: Start frequency | |
404 | * | |
405 | * Search for the matching floor *available* OPP from a starting freq | |
406 | * for a device. | |
407 | * | |
984f16c8 | 408 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
409 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
410 | * values can be: | |
411 | * EINVAL: for bad pointer | |
412 | * ERANGE: no match found for search | |
413 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
414 | * |
415 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
416 | * protected pointer. The reason for the same is that the opp pointer which is | |
417 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
418 | * under the locked area. The pointer returned must be used prior to unlocking | |
419 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
420 | */ | |
47d43ba7 NM |
421 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
422 | unsigned long *freq) | |
e1f60b29 NM |
423 | { |
424 | struct device_opp *dev_opp; | |
47d43ba7 | 425 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 426 | |
b02ded24 DT |
427 | opp_rcu_lockdep_assert(); |
428 | ||
e1f60b29 NM |
429 | if (!dev || !freq) { |
430 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
431 | return ERR_PTR(-EINVAL); | |
432 | } | |
433 | ||
327854c8 | 434 | dev_opp = _find_device_opp(dev); |
e1f60b29 | 435 | if (IS_ERR(dev_opp)) |
0779726c | 436 | return ERR_CAST(dev_opp); |
e1f60b29 NM |
437 | |
438 | list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) { | |
439 | if (temp_opp->available) { | |
440 | /* go to the next node, before choosing prev */ | |
441 | if (temp_opp->rate > *freq) | |
442 | break; | |
443 | else | |
444 | opp = temp_opp; | |
445 | } | |
446 | } | |
447 | if (!IS_ERR(opp)) | |
448 | *freq = opp->rate; | |
449 | ||
450 | return opp; | |
451 | } | |
5d4879cd | 452 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 453 | |
06441658 VK |
454 | /* List-dev Helpers */ |
455 | static void _kfree_list_dev_rcu(struct rcu_head *head) | |
456 | { | |
457 | struct device_list_opp *list_dev; | |
458 | ||
459 | list_dev = container_of(head, struct device_list_opp, rcu_head); | |
460 | kfree_rcu(list_dev, rcu_head); | |
461 | } | |
462 | ||
463 | static void _remove_list_dev(struct device_list_opp *list_dev, | |
464 | struct device_opp *dev_opp) | |
465 | { | |
deaa5146 | 466 | opp_debug_unregister(list_dev, dev_opp); |
06441658 VK |
467 | list_del(&list_dev->node); |
468 | call_srcu(&dev_opp->srcu_head.srcu, &list_dev->rcu_head, | |
469 | _kfree_list_dev_rcu); | |
470 | } | |
471 | ||
f59d3ee8 VK |
472 | struct device_list_opp *_add_list_dev(const struct device *dev, |
473 | struct device_opp *dev_opp) | |
06441658 VK |
474 | { |
475 | struct device_list_opp *list_dev; | |
deaa5146 | 476 | int ret; |
06441658 VK |
477 | |
478 | list_dev = kzalloc(sizeof(*list_dev), GFP_KERNEL); | |
479 | if (!list_dev) | |
480 | return NULL; | |
481 | ||
482 | /* Initialize list-dev */ | |
483 | list_dev->dev = dev; | |
484 | list_add_rcu(&list_dev->node, &dev_opp->dev_list); | |
485 | ||
deaa5146 VK |
486 | /* Create debugfs entries for the dev_opp */ |
487 | ret = opp_debug_register(list_dev, dev_opp); | |
488 | if (ret) | |
489 | dev_err(dev, "%s: Failed to register opp debugfs (%d)\n", | |
490 | __func__, ret); | |
491 | ||
06441658 VK |
492 | return list_dev; |
493 | } | |
494 | ||
984f16c8 | 495 | /** |
aa5f2f85 | 496 | * _add_device_opp() - Find device OPP table or allocate a new one |
984f16c8 NM |
497 | * @dev: device for which we do this operation |
498 | * | |
aa5f2f85 VK |
499 | * It tries to find an existing table first, if it couldn't find one, it |
500 | * allocates a new OPP table and returns that. | |
984f16c8 NM |
501 | * |
502 | * Return: valid device_opp pointer if success, else NULL. | |
503 | */ | |
327854c8 | 504 | static struct device_opp *_add_device_opp(struct device *dev) |
07cce74a VK |
505 | { |
506 | struct device_opp *dev_opp; | |
06441658 | 507 | struct device_list_opp *list_dev; |
07cce74a | 508 | |
aa5f2f85 VK |
509 | /* Check for existing list for 'dev' first */ |
510 | dev_opp = _find_device_opp(dev); | |
511 | if (!IS_ERR(dev_opp)) | |
512 | return dev_opp; | |
07cce74a VK |
513 | |
514 | /* | |
515 | * Allocate a new device OPP table. In the infrequent case where a new | |
516 | * device is needed to be added, we pay this penalty. | |
517 | */ | |
518 | dev_opp = kzalloc(sizeof(*dev_opp), GFP_KERNEL); | |
519 | if (!dev_opp) | |
520 | return NULL; | |
521 | ||
06441658 VK |
522 | INIT_LIST_HEAD(&dev_opp->dev_list); |
523 | ||
524 | list_dev = _add_list_dev(dev, dev_opp); | |
525 | if (!list_dev) { | |
526 | kfree(dev_opp); | |
527 | return NULL; | |
528 | } | |
529 | ||
07cce74a VK |
530 | srcu_init_notifier_head(&dev_opp->srcu_head); |
531 | INIT_LIST_HEAD(&dev_opp->opp_list); | |
532 | ||
533 | /* Secure the device list modification */ | |
534 | list_add_rcu(&dev_opp->node, &dev_opp_list); | |
535 | return dev_opp; | |
536 | } | |
537 | ||
984f16c8 | 538 | /** |
737002b5 VK |
539 | * _kfree_device_rcu() - Free device_opp RCU handler |
540 | * @head: RCU head | |
984f16c8 | 541 | */ |
737002b5 | 542 | static void _kfree_device_rcu(struct rcu_head *head) |
e1f60b29 | 543 | { |
737002b5 | 544 | struct device_opp *device_opp = container_of(head, struct device_opp, rcu_head); |
6ce4184d | 545 | |
737002b5 | 546 | kfree_rcu(device_opp, rcu_head); |
e1f60b29 | 547 | } |
38393409 VK |
548 | |
549 | /** | |
3bac42ca VK |
550 | * _remove_device_opp() - Removes a device OPP table |
551 | * @dev_opp: device OPP table to be removed. | |
38393409 | 552 | * |
3bac42ca | 553 | * Removes/frees device OPP table it it doesn't contain any OPPs. |
38393409 | 554 | */ |
3bac42ca | 555 | static void _remove_device_opp(struct device_opp *dev_opp) |
38393409 | 556 | { |
06441658 VK |
557 | struct device_list_opp *list_dev; |
558 | ||
3bac42ca VK |
559 | if (!list_empty(&dev_opp->opp_list)) |
560 | return; | |
561 | ||
7de36b0a VK |
562 | if (dev_opp->supported_hw) |
563 | return; | |
564 | ||
01fb4d3c VK |
565 | if (dev_opp->prop_name) |
566 | return; | |
567 | ||
06441658 VK |
568 | list_dev = list_first_entry(&dev_opp->dev_list, struct device_list_opp, |
569 | node); | |
570 | ||
571 | _remove_list_dev(list_dev, dev_opp); | |
572 | ||
573 | /* dev_list must be empty now */ | |
574 | WARN_ON(!list_empty(&dev_opp->dev_list)); | |
575 | ||
3bac42ca VK |
576 | list_del_rcu(&dev_opp->node); |
577 | call_srcu(&dev_opp->srcu_head.srcu, &dev_opp->rcu_head, | |
578 | _kfree_device_rcu); | |
38393409 | 579 | } |
e1f60b29 | 580 | |
984f16c8 NM |
581 | /** |
582 | * _kfree_opp_rcu() - Free OPP RCU handler | |
583 | * @head: RCU head | |
584 | */ | |
327854c8 | 585 | static void _kfree_opp_rcu(struct rcu_head *head) |
129eec55 VK |
586 | { |
587 | struct dev_pm_opp *opp = container_of(head, struct dev_pm_opp, rcu_head); | |
588 | ||
589 | kfree_rcu(opp, rcu_head); | |
590 | } | |
591 | ||
984f16c8 NM |
592 | /** |
593 | * _opp_remove() - Remove an OPP from a table definition | |
594 | * @dev_opp: points back to the device_opp struct this opp belongs to | |
595 | * @opp: pointer to the OPP to remove | |
23dacf6d | 596 | * @notify: OPP_EVENT_REMOVE notification should be sent or not |
984f16c8 NM |
597 | * |
598 | * This function removes an opp definition from the opp list. | |
599 | * | |
600 | * Locking: The internal device_opp and opp structures are RCU protected. | |
601 | * It is assumed that the caller holds required mutex for an RCU updater | |
602 | * strategy. | |
603 | */ | |
327854c8 | 604 | static void _opp_remove(struct device_opp *dev_opp, |
23dacf6d | 605 | struct dev_pm_opp *opp, bool notify) |
129eec55 VK |
606 | { |
607 | /* | |
608 | * Notify the changes in the availability of the operable | |
609 | * frequency/voltage list. | |
610 | */ | |
23dacf6d VK |
611 | if (notify) |
612 | srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_REMOVE, opp); | |
deaa5146 | 613 | opp_debug_remove_one(opp); |
129eec55 | 614 | list_del_rcu(&opp->node); |
327854c8 | 615 | call_srcu(&dev_opp->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu); |
129eec55 | 616 | |
3bac42ca | 617 | _remove_device_opp(dev_opp); |
129eec55 VK |
618 | } |
619 | ||
620 | /** | |
621 | * dev_pm_opp_remove() - Remove an OPP from OPP list | |
622 | * @dev: device for which we do this operation | |
623 | * @freq: OPP to remove with matching 'freq' | |
624 | * | |
625 | * This function removes an opp from the opp list. | |
984f16c8 NM |
626 | * |
627 | * Locking: The internal device_opp and opp structures are RCU protected. | |
628 | * Hence this function internally uses RCU updater strategy with mutex locks | |
629 | * to keep the integrity of the internal data structures. Callers should ensure | |
630 | * that this function is *NOT* called under RCU protection or in contexts where | |
631 | * mutex cannot be locked. | |
129eec55 VK |
632 | */ |
633 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
634 | { | |
635 | struct dev_pm_opp *opp; | |
636 | struct device_opp *dev_opp; | |
637 | bool found = false; | |
638 | ||
639 | /* Hold our list modification lock here */ | |
640 | mutex_lock(&dev_opp_list_lock); | |
641 | ||
327854c8 | 642 | dev_opp = _find_device_opp(dev); |
129eec55 VK |
643 | if (IS_ERR(dev_opp)) |
644 | goto unlock; | |
645 | ||
646 | list_for_each_entry(opp, &dev_opp->opp_list, node) { | |
647 | if (opp->rate == freq) { | |
648 | found = true; | |
649 | break; | |
650 | } | |
651 | } | |
652 | ||
653 | if (!found) { | |
654 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", | |
655 | __func__, freq); | |
656 | goto unlock; | |
657 | } | |
658 | ||
23dacf6d | 659 | _opp_remove(dev_opp, opp, true); |
129eec55 VK |
660 | unlock: |
661 | mutex_unlock(&dev_opp_list_lock); | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
664 | ||
23dacf6d VK |
665 | static struct dev_pm_opp *_allocate_opp(struct device *dev, |
666 | struct device_opp **dev_opp) | |
e1f60b29 | 667 | { |
23dacf6d | 668 | struct dev_pm_opp *opp; |
e1f60b29 | 669 | |
23dacf6d VK |
670 | /* allocate new OPP node */ |
671 | opp = kzalloc(sizeof(*opp), GFP_KERNEL); | |
672 | if (!opp) | |
673 | return NULL; | |
e1f60b29 | 674 | |
23dacf6d | 675 | INIT_LIST_HEAD(&opp->node); |
e1f60b29 | 676 | |
23dacf6d VK |
677 | *dev_opp = _add_device_opp(dev); |
678 | if (!*dev_opp) { | |
679 | kfree(opp); | |
680 | return NULL; | |
681 | } | |
682 | ||
683 | return opp; | |
684 | } | |
685 | ||
06441658 VK |
686 | static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, |
687 | struct device_opp *dev_opp) | |
23dacf6d VK |
688 | { |
689 | struct dev_pm_opp *opp; | |
690 | struct list_head *head = &dev_opp->opp_list; | |
deaa5146 | 691 | int ret; |
23dacf6d VK |
692 | |
693 | /* | |
694 | * Insert new OPP in order of increasing frequency and discard if | |
695 | * already present. | |
696 | * | |
697 | * Need to use &dev_opp->opp_list in the condition part of the 'for' | |
698 | * loop, don't replace it with head otherwise it will become an infinite | |
699 | * loop. | |
700 | */ | |
701 | list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) { | |
702 | if (new_opp->rate > opp->rate) { | |
703 | head = &opp->node; | |
704 | continue; | |
705 | } | |
706 | ||
707 | if (new_opp->rate < opp->rate) | |
708 | break; | |
709 | ||
710 | /* Duplicate OPPs */ | |
06441658 | 711 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
23dacf6d VK |
712 | __func__, opp->rate, opp->u_volt, opp->available, |
713 | new_opp->rate, new_opp->u_volt, new_opp->available); | |
714 | ||
715 | return opp->available && new_opp->u_volt == opp->u_volt ? | |
716 | 0 : -EEXIST; | |
717 | } | |
718 | ||
719 | new_opp->dev_opp = dev_opp; | |
720 | list_add_rcu(&new_opp->node, head); | |
721 | ||
deaa5146 VK |
722 | ret = opp_debug_create_one(new_opp, dev_opp); |
723 | if (ret) | |
724 | dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n", | |
725 | __func__, ret); | |
726 | ||
23dacf6d VK |
727 | return 0; |
728 | } | |
729 | ||
984f16c8 | 730 | /** |
b64b9c3f | 731 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
984f16c8 NM |
732 | * @dev: device for which we do this operation |
733 | * @freq: Frequency in Hz for this OPP | |
734 | * @u_volt: Voltage in uVolts for this OPP | |
735 | * @dynamic: Dynamically added OPPs. | |
736 | * | |
737 | * This function adds an opp definition to the opp list and returns status. | |
738 | * The opp is made available by default and it can be controlled using | |
739 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
740 | * | |
8f8d37b2 VK |
741 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
742 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 NM |
743 | * |
744 | * Locking: The internal device_opp and opp structures are RCU protected. | |
745 | * Hence this function internally uses RCU updater strategy with mutex locks | |
746 | * to keep the integrity of the internal data structures. Callers should ensure | |
747 | * that this function is *NOT* called under RCU protection or in contexts where | |
748 | * mutex cannot be locked. | |
749 | * | |
750 | * Return: | |
751 | * 0 On success OR | |
752 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
753 | * -EEXIST Freq are same and volt are different OR | |
754 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
755 | * -ENOMEM Memory allocation failure | |
756 | */ | |
b64b9c3f VK |
757 | static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, |
758 | bool dynamic) | |
e1f60b29 | 759 | { |
aa5f2f85 | 760 | struct device_opp *dev_opp; |
23dacf6d | 761 | struct dev_pm_opp *new_opp; |
6ce4184d | 762 | int ret; |
e1f60b29 | 763 | |
e1f60b29 NM |
764 | /* Hold our list modification lock here */ |
765 | mutex_lock(&dev_opp_list_lock); | |
766 | ||
23dacf6d VK |
767 | new_opp = _allocate_opp(dev, &dev_opp); |
768 | if (!new_opp) { | |
769 | ret = -ENOMEM; | |
770 | goto unlock; | |
771 | } | |
772 | ||
a7470db6 | 773 | /* populate the opp table */ |
a7470db6 VK |
774 | new_opp->rate = freq; |
775 | new_opp->u_volt = u_volt; | |
776 | new_opp->available = true; | |
23dacf6d | 777 | new_opp->dynamic = dynamic; |
a7470db6 | 778 | |
06441658 | 779 | ret = _opp_add(dev, new_opp, dev_opp); |
23dacf6d | 780 | if (ret) |
6ce4184d | 781 | goto free_opp; |
64ce8545 | 782 | |
e1f60b29 NM |
783 | mutex_unlock(&dev_opp_list_lock); |
784 | ||
03ca370f MH |
785 | /* |
786 | * Notify the changes in the availability of the operable | |
787 | * frequency/voltage list. | |
788 | */ | |
cd1a068a | 789 | srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 790 | return 0; |
6ce4184d VK |
791 | |
792 | free_opp: | |
23dacf6d VK |
793 | _opp_remove(dev_opp, new_opp, false); |
794 | unlock: | |
6ce4184d | 795 | mutex_unlock(&dev_opp_list_lock); |
6ce4184d | 796 | return ret; |
e1f60b29 | 797 | } |
38393409 | 798 | |
27465902 | 799 | /* TODO: Support multiple regulators */ |
01fb4d3c VK |
800 | static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, |
801 | struct device_opp *dev_opp) | |
27465902 VK |
802 | { |
803 | u32 microvolt[3] = {0}; | |
ad623c31 | 804 | u32 val; |
27465902 | 805 | int count, ret; |
01fb4d3c VK |
806 | struct property *prop = NULL; |
807 | char name[NAME_MAX]; | |
808 | ||
809 | /* Search for "opp-microvolt-<name>" */ | |
810 | if (dev_opp->prop_name) { | |
5ff24d60 VK |
811 | snprintf(name, sizeof(name), "opp-microvolt-%s", |
812 | dev_opp->prop_name); | |
01fb4d3c VK |
813 | prop = of_find_property(opp->np, name, NULL); |
814 | } | |
815 | ||
816 | if (!prop) { | |
817 | /* Search for "opp-microvolt" */ | |
fd8d8e63 | 818 | sprintf(name, "opp-microvolt"); |
01fb4d3c | 819 | prop = of_find_property(opp->np, name, NULL); |
27465902 | 820 | |
01fb4d3c VK |
821 | /* Missing property isn't a problem, but an invalid entry is */ |
822 | if (!prop) | |
823 | return 0; | |
824 | } | |
27465902 | 825 | |
01fb4d3c | 826 | count = of_property_count_u32_elems(opp->np, name); |
680168a5 | 827 | if (count < 0) { |
01fb4d3c VK |
828 | dev_err(dev, "%s: Invalid %s property (%d)\n", |
829 | __func__, name, count); | |
680168a5 VK |
830 | return count; |
831 | } | |
832 | ||
27465902 VK |
833 | /* There can be one or three elements here */ |
834 | if (count != 1 && count != 3) { | |
01fb4d3c VK |
835 | dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n", |
836 | __func__, name, count); | |
27465902 VK |
837 | return -EINVAL; |
838 | } | |
839 | ||
01fb4d3c | 840 | ret = of_property_read_u32_array(opp->np, name, microvolt, count); |
27465902 | 841 | if (ret) { |
01fb4d3c | 842 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); |
27465902 VK |
843 | return -EINVAL; |
844 | } | |
845 | ||
846 | opp->u_volt = microvolt[0]; | |
847 | opp->u_volt_min = microvolt[1]; | |
848 | opp->u_volt_max = microvolt[2]; | |
849 | ||
01fb4d3c VK |
850 | /* Search for "opp-microamp-<name>" */ |
851 | prop = NULL; | |
852 | if (dev_opp->prop_name) { | |
5ff24d60 VK |
853 | snprintf(name, sizeof(name), "opp-microamp-%s", |
854 | dev_opp->prop_name); | |
01fb4d3c VK |
855 | prop = of_find_property(opp->np, name, NULL); |
856 | } | |
857 | ||
858 | if (!prop) { | |
859 | /* Search for "opp-microamp" */ | |
fd8d8e63 | 860 | sprintf(name, "opp-microamp"); |
01fb4d3c VK |
861 | prop = of_find_property(opp->np, name, NULL); |
862 | } | |
863 | ||
864 | if (prop && !of_property_read_u32(opp->np, name, &val)) | |
ad623c31 VK |
865 | opp->u_amp = val; |
866 | ||
27465902 VK |
867 | return 0; |
868 | } | |
869 | ||
7de36b0a VK |
870 | /** |
871 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
872 | * @dev: Device for which supported-hw has to be set. | |
873 | * @versions: Array of hierarchy of versions to match. | |
874 | * @count: Number of elements in the array. | |
875 | * | |
876 | * This is required only for the V2 bindings, and it enables a platform to | |
877 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
878 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
879 | * property. | |
880 | * | |
881 | * Locking: The internal device_opp and opp structures are RCU protected. | |
882 | * Hence this function internally uses RCU updater strategy with mutex locks | |
883 | * to keep the integrity of the internal data structures. Callers should ensure | |
884 | * that this function is *NOT* called under RCU protection or in contexts where | |
885 | * mutex cannot be locked. | |
886 | */ | |
887 | int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, | |
888 | unsigned int count) | |
889 | { | |
890 | struct device_opp *dev_opp; | |
891 | int ret = 0; | |
892 | ||
893 | /* Hold our list modification lock here */ | |
894 | mutex_lock(&dev_opp_list_lock); | |
895 | ||
896 | dev_opp = _add_device_opp(dev); | |
897 | if (!dev_opp) { | |
898 | ret = -ENOMEM; | |
899 | goto unlock; | |
900 | } | |
901 | ||
902 | /* Make sure there are no concurrent readers while updating dev_opp */ | |
903 | WARN_ON(!list_empty(&dev_opp->opp_list)); | |
904 | ||
905 | /* Do we already have a version hierarchy associated with dev_opp? */ | |
906 | if (dev_opp->supported_hw) { | |
907 | dev_err(dev, "%s: Already have supported hardware list\n", | |
908 | __func__); | |
909 | ret = -EBUSY; | |
910 | goto err; | |
911 | } | |
912 | ||
913 | dev_opp->supported_hw = kmemdup(versions, count * sizeof(*versions), | |
914 | GFP_KERNEL); | |
915 | if (!dev_opp->supported_hw) { | |
916 | ret = -ENOMEM; | |
917 | goto err; | |
918 | } | |
919 | ||
920 | dev_opp->supported_hw_count = count; | |
921 | mutex_unlock(&dev_opp_list_lock); | |
922 | return 0; | |
923 | ||
924 | err: | |
925 | _remove_device_opp(dev_opp); | |
926 | unlock: | |
927 | mutex_unlock(&dev_opp_list_lock); | |
928 | ||
929 | return ret; | |
930 | } | |
931 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
932 | ||
933 | /** | |
934 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
935 | * @dev: Device for which supported-hw has to be set. | |
936 | * | |
937 | * This is required only for the V2 bindings, and is called for a matching | |
938 | * dev_pm_opp_set_supported_hw(). Until this is called, the device_opp structure | |
939 | * will not be freed. | |
940 | * | |
941 | * Locking: The internal device_opp and opp structures are RCU protected. | |
942 | * Hence this function internally uses RCU updater strategy with mutex locks | |
943 | * to keep the integrity of the internal data structures. Callers should ensure | |
944 | * that this function is *NOT* called under RCU protection or in contexts where | |
945 | * mutex cannot be locked. | |
946 | */ | |
947 | void dev_pm_opp_put_supported_hw(struct device *dev) | |
948 | { | |
949 | struct device_opp *dev_opp; | |
950 | ||
951 | /* Hold our list modification lock here */ | |
952 | mutex_lock(&dev_opp_list_lock); | |
953 | ||
954 | /* Check for existing list for 'dev' first */ | |
955 | dev_opp = _find_device_opp(dev); | |
956 | if (IS_ERR(dev_opp)) { | |
957 | dev_err(dev, "Failed to find dev_opp: %ld\n", PTR_ERR(dev_opp)); | |
958 | goto unlock; | |
959 | } | |
960 | ||
961 | /* Make sure there are no concurrent readers while updating dev_opp */ | |
962 | WARN_ON(!list_empty(&dev_opp->opp_list)); | |
963 | ||
964 | if (!dev_opp->supported_hw) { | |
965 | dev_err(dev, "%s: Doesn't have supported hardware list\n", | |
966 | __func__); | |
967 | goto unlock; | |
968 | } | |
969 | ||
970 | kfree(dev_opp->supported_hw); | |
971 | dev_opp->supported_hw = NULL; | |
972 | dev_opp->supported_hw_count = 0; | |
973 | ||
974 | /* Try freeing device_opp if this was the last blocking resource */ | |
975 | _remove_device_opp(dev_opp); | |
976 | ||
977 | unlock: | |
978 | mutex_unlock(&dev_opp_list_lock); | |
979 | } | |
980 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
981 | ||
01fb4d3c VK |
982 | /** |
983 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
984 | * @dev: Device for which the regulator has to be set. | |
985 | * @name: name to postfix to properties. | |
986 | * | |
987 | * This is required only for the V2 bindings, and it enables a platform to | |
988 | * specify the extn to be used for certain property names. The properties to | |
989 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
990 | * should postfix the property name with -<name> while looking for them. | |
991 | * | |
992 | * Locking: The internal device_opp and opp structures are RCU protected. | |
993 | * Hence this function internally uses RCU updater strategy with mutex locks | |
994 | * to keep the integrity of the internal data structures. Callers should ensure | |
995 | * that this function is *NOT* called under RCU protection or in contexts where | |
996 | * mutex cannot be locked. | |
997 | */ | |
998 | int dev_pm_opp_set_prop_name(struct device *dev, const char *name) | |
999 | { | |
1000 | struct device_opp *dev_opp; | |
1001 | int ret = 0; | |
1002 | ||
1003 | /* Hold our list modification lock here */ | |
1004 | mutex_lock(&dev_opp_list_lock); | |
1005 | ||
1006 | dev_opp = _add_device_opp(dev); | |
1007 | if (!dev_opp) { | |
1008 | ret = -ENOMEM; | |
1009 | goto unlock; | |
1010 | } | |
1011 | ||
1012 | /* Make sure there are no concurrent readers while updating dev_opp */ | |
1013 | WARN_ON(!list_empty(&dev_opp->opp_list)); | |
1014 | ||
1015 | /* Do we already have a prop-name associated with dev_opp? */ | |
1016 | if (dev_opp->prop_name) { | |
1017 | dev_err(dev, "%s: Already have prop-name %s\n", __func__, | |
1018 | dev_opp->prop_name); | |
1019 | ret = -EBUSY; | |
1020 | goto err; | |
1021 | } | |
1022 | ||
1023 | dev_opp->prop_name = kstrdup(name, GFP_KERNEL); | |
1024 | if (!dev_opp->prop_name) { | |
1025 | ret = -ENOMEM; | |
1026 | goto err; | |
1027 | } | |
1028 | ||
1029 | mutex_unlock(&dev_opp_list_lock); | |
1030 | return 0; | |
1031 | ||
1032 | err: | |
1033 | _remove_device_opp(dev_opp); | |
1034 | unlock: | |
1035 | mutex_unlock(&dev_opp_list_lock); | |
1036 | ||
1037 | return ret; | |
1038 | } | |
1039 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1040 | ||
1041 | /** | |
1042 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
1043 | * @dev: Device for which the regulator has to be set. | |
1044 | * | |
1045 | * This is required only for the V2 bindings, and is called for a matching | |
1046 | * dev_pm_opp_set_prop_name(). Until this is called, the device_opp structure | |
1047 | * will not be freed. | |
1048 | * | |
1049 | * Locking: The internal device_opp and opp structures are RCU protected. | |
1050 | * Hence this function internally uses RCU updater strategy with mutex locks | |
1051 | * to keep the integrity of the internal data structures. Callers should ensure | |
1052 | * that this function is *NOT* called under RCU protection or in contexts where | |
1053 | * mutex cannot be locked. | |
1054 | */ | |
1055 | void dev_pm_opp_put_prop_name(struct device *dev) | |
1056 | { | |
1057 | struct device_opp *dev_opp; | |
1058 | ||
1059 | /* Hold our list modification lock here */ | |
1060 | mutex_lock(&dev_opp_list_lock); | |
1061 | ||
1062 | /* Check for existing list for 'dev' first */ | |
1063 | dev_opp = _find_device_opp(dev); | |
1064 | if (IS_ERR(dev_opp)) { | |
1065 | dev_err(dev, "Failed to find dev_opp: %ld\n", PTR_ERR(dev_opp)); | |
1066 | goto unlock; | |
1067 | } | |
1068 | ||
1069 | /* Make sure there are no concurrent readers while updating dev_opp */ | |
1070 | WARN_ON(!list_empty(&dev_opp->opp_list)); | |
1071 | ||
1072 | if (!dev_opp->prop_name) { | |
1073 | dev_err(dev, "%s: Doesn't have a prop-name\n", __func__); | |
1074 | goto unlock; | |
1075 | } | |
1076 | ||
1077 | kfree(dev_opp->prop_name); | |
1078 | dev_opp->prop_name = NULL; | |
1079 | ||
1080 | /* Try freeing device_opp if this was the last blocking resource */ | |
1081 | _remove_device_opp(dev_opp); | |
1082 | ||
1083 | unlock: | |
1084 | mutex_unlock(&dev_opp_list_lock); | |
1085 | } | |
1086 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1087 | ||
7de36b0a VK |
1088 | static bool _opp_is_supported(struct device *dev, struct device_opp *dev_opp, |
1089 | struct device_node *np) | |
1090 | { | |
1091 | unsigned int count = dev_opp->supported_hw_count; | |
1092 | u32 version; | |
1093 | int ret; | |
1094 | ||
1095 | if (!dev_opp->supported_hw) | |
1096 | return true; | |
1097 | ||
1098 | while (count--) { | |
1099 | ret = of_property_read_u32_index(np, "opp-supported-hw", count, | |
1100 | &version); | |
1101 | if (ret) { | |
1102 | dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", | |
1103 | __func__, count, ret); | |
1104 | return false; | |
1105 | } | |
1106 | ||
1107 | /* Both of these are bitwise masks of the versions */ | |
1108 | if (!(version & dev_opp->supported_hw[count])) | |
1109 | return false; | |
1110 | } | |
1111 | ||
1112 | return true; | |
1113 | } | |
1114 | ||
27465902 VK |
1115 | /** |
1116 | * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) | |
1117 | * @dev: device for which we do this operation | |
1118 | * @np: device node | |
1119 | * | |
1120 | * This function adds an opp definition to the opp list and returns status. The | |
1121 | * opp can be controlled using dev_pm_opp_enable/disable functions and may be | |
1122 | * removed by dev_pm_opp_remove. | |
1123 | * | |
1124 | * Locking: The internal device_opp and opp structures are RCU protected. | |
1125 | * Hence this function internally uses RCU updater strategy with mutex locks | |
1126 | * to keep the integrity of the internal data structures. Callers should ensure | |
1127 | * that this function is *NOT* called under RCU protection or in contexts where | |
1128 | * mutex cannot be locked. | |
1129 | * | |
1130 | * Return: | |
1131 | * 0 On success OR | |
1132 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1133 | * -EEXIST Freq are same and volt are different OR | |
1134 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1135 | * -ENOMEM Memory allocation failure | |
1136 | * -EINVAL Failed parsing the OPP node | |
1137 | */ | |
1138 | static int _opp_add_static_v2(struct device *dev, struct device_node *np) | |
1139 | { | |
1140 | struct device_opp *dev_opp; | |
1141 | struct dev_pm_opp *new_opp; | |
1142 | u64 rate; | |
68fa9f0a | 1143 | u32 val; |
27465902 VK |
1144 | int ret; |
1145 | ||
1146 | /* Hold our list modification lock here */ | |
1147 | mutex_lock(&dev_opp_list_lock); | |
1148 | ||
1149 | new_opp = _allocate_opp(dev, &dev_opp); | |
1150 | if (!new_opp) { | |
1151 | ret = -ENOMEM; | |
1152 | goto unlock; | |
1153 | } | |
1154 | ||
1155 | ret = of_property_read_u64(np, "opp-hz", &rate); | |
1156 | if (ret < 0) { | |
1157 | dev_err(dev, "%s: opp-hz not found\n", __func__); | |
1158 | goto free_opp; | |
1159 | } | |
1160 | ||
7de36b0a VK |
1161 | /* Check if the OPP supports hardware's hierarchy of versions or not */ |
1162 | if (!_opp_is_supported(dev, dev_opp, np)) { | |
1163 | dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); | |
1164 | goto free_opp; | |
1165 | } | |
1166 | ||
27465902 VK |
1167 | /* |
1168 | * Rate is defined as an unsigned long in clk API, and so casting | |
1169 | * explicitly to its type. Must be fixed once rate is 64 bit | |
1170 | * guaranteed in clk API. | |
1171 | */ | |
1172 | new_opp->rate = (unsigned long)rate; | |
1173 | new_opp->turbo = of_property_read_bool(np, "turbo-mode"); | |
1174 | ||
1175 | new_opp->np = np; | |
1176 | new_opp->dynamic = false; | |
1177 | new_opp->available = true; | |
68fa9f0a VK |
1178 | |
1179 | if (!of_property_read_u32(np, "clock-latency-ns", &val)) | |
1180 | new_opp->clock_latency_ns = val; | |
27465902 | 1181 | |
01fb4d3c | 1182 | ret = opp_parse_supplies(new_opp, dev, dev_opp); |
27465902 VK |
1183 | if (ret) |
1184 | goto free_opp; | |
1185 | ||
06441658 | 1186 | ret = _opp_add(dev, new_opp, dev_opp); |
27465902 VK |
1187 | if (ret) |
1188 | goto free_opp; | |
1189 | ||
ad656a6a VK |
1190 | /* OPP to select on device suspend */ |
1191 | if (of_property_read_bool(np, "opp-suspend")) { | |
deaa5146 | 1192 | if (dev_opp->suspend_opp) { |
ad656a6a VK |
1193 | dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n", |
1194 | __func__, dev_opp->suspend_opp->rate, | |
1195 | new_opp->rate); | |
deaa5146 VK |
1196 | } else { |
1197 | new_opp->suspend = true; | |
ad656a6a | 1198 | dev_opp->suspend_opp = new_opp; |
deaa5146 | 1199 | } |
ad656a6a VK |
1200 | } |
1201 | ||
3ca9bb33 VK |
1202 | if (new_opp->clock_latency_ns > dev_opp->clock_latency_ns_max) |
1203 | dev_opp->clock_latency_ns_max = new_opp->clock_latency_ns; | |
1204 | ||
27465902 VK |
1205 | mutex_unlock(&dev_opp_list_lock); |
1206 | ||
3ca9bb33 | 1207 | pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", |
27465902 | 1208 | __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt, |
3ca9bb33 VK |
1209 | new_opp->u_volt_min, new_opp->u_volt_max, |
1210 | new_opp->clock_latency_ns); | |
27465902 VK |
1211 | |
1212 | /* | |
1213 | * Notify the changes in the availability of the operable | |
1214 | * frequency/voltage list. | |
1215 | */ | |
1216 | srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_ADD, new_opp); | |
1217 | return 0; | |
1218 | ||
1219 | free_opp: | |
1220 | _opp_remove(dev_opp, new_opp, false); | |
1221 | unlock: | |
1222 | mutex_unlock(&dev_opp_list_lock); | |
1223 | return ret; | |
1224 | } | |
1225 | ||
38393409 VK |
1226 | /** |
1227 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
1228 | * @dev: device for which we do this operation | |
1229 | * @freq: Frequency in Hz for this OPP | |
1230 | * @u_volt: Voltage in uVolts for this OPP | |
1231 | * | |
1232 | * This function adds an opp definition to the opp list and returns status. | |
1233 | * The opp is made available by default and it can be controlled using | |
1234 | * dev_pm_opp_enable/disable functions. | |
1235 | * | |
1236 | * Locking: The internal device_opp and opp structures are RCU protected. | |
1237 | * Hence this function internally uses RCU updater strategy with mutex locks | |
1238 | * to keep the integrity of the internal data structures. Callers should ensure | |
1239 | * that this function is *NOT* called under RCU protection or in contexts where | |
1240 | * mutex cannot be locked. | |
1241 | * | |
1242 | * Return: | |
984f16c8 | 1243 | * 0 On success OR |
38393409 | 1244 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 1245 | * -EEXIST Freq are same and volt are different OR |
38393409 | 1246 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 1247 | * -ENOMEM Memory allocation failure |
38393409 VK |
1248 | */ |
1249 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
1250 | { | |
b64b9c3f | 1251 | return _opp_add_v1(dev, freq, u_volt, true); |
38393409 | 1252 | } |
5d4879cd | 1253 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
1254 | |
1255 | /** | |
327854c8 | 1256 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
1257 | * @dev: device for which we do this operation |
1258 | * @freq: OPP frequency to modify availability | |
1259 | * @availability_req: availability status requested for this opp | |
1260 | * | |
1261 | * Set the availability of an OPP with an RCU operation, opp_{enable,disable} | |
1262 | * share a common logic which is isolated here. | |
1263 | * | |
984f16c8 | 1264 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1265 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 NM |
1266 | * successful. |
1267 | * | |
1268 | * Locking: The internal device_opp and opp structures are RCU protected. | |
1269 | * Hence this function internally uses RCU updater strategy with mutex locks to | |
1270 | * keep the integrity of the internal data structures. Callers should ensure | |
1271 | * that this function is *NOT* called under RCU protection or in contexts where | |
1272 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
1273 | */ | |
327854c8 NM |
1274 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
1275 | bool availability_req) | |
e1f60b29 | 1276 | { |
29df0ee1 | 1277 | struct device_opp *dev_opp; |
47d43ba7 | 1278 | struct dev_pm_opp *new_opp, *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
1279 | int r = 0; |
1280 | ||
1281 | /* keep the node allocated */ | |
47d43ba7 | 1282 | new_opp = kmalloc(sizeof(*new_opp), GFP_KERNEL); |
59d84ca8 | 1283 | if (!new_opp) |
e1f60b29 | 1284 | return -ENOMEM; |
e1f60b29 NM |
1285 | |
1286 | mutex_lock(&dev_opp_list_lock); | |
1287 | ||
1288 | /* Find the device_opp */ | |
327854c8 | 1289 | dev_opp = _find_device_opp(dev); |
e1f60b29 NM |
1290 | if (IS_ERR(dev_opp)) { |
1291 | r = PTR_ERR(dev_opp); | |
1292 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); | |
1293 | goto unlock; | |
1294 | } | |
1295 | ||
1296 | /* Do we have the frequency? */ | |
1297 | list_for_each_entry(tmp_opp, &dev_opp->opp_list, node) { | |
1298 | if (tmp_opp->rate == freq) { | |
1299 | opp = tmp_opp; | |
1300 | break; | |
1301 | } | |
1302 | } | |
1303 | if (IS_ERR(opp)) { | |
1304 | r = PTR_ERR(opp); | |
1305 | goto unlock; | |
1306 | } | |
1307 | ||
1308 | /* Is update really needed? */ | |
1309 | if (opp->available == availability_req) | |
1310 | goto unlock; | |
1311 | /* copy the old data over */ | |
1312 | *new_opp = *opp; | |
1313 | ||
1314 | /* plug in new node */ | |
1315 | new_opp->available = availability_req; | |
1316 | ||
1317 | list_replace_rcu(&opp->node, &new_opp->node); | |
1318 | mutex_unlock(&dev_opp_list_lock); | |
327854c8 | 1319 | call_srcu(&dev_opp->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu); |
e1f60b29 | 1320 | |
03ca370f MH |
1321 | /* Notify the change of the OPP availability */ |
1322 | if (availability_req) | |
cd1a068a | 1323 | srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_ENABLE, |
03ca370f MH |
1324 | new_opp); |
1325 | else | |
cd1a068a | 1326 | srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_DISABLE, |
03ca370f MH |
1327 | new_opp); |
1328 | ||
dde8437d | 1329 | return 0; |
e1f60b29 NM |
1330 | |
1331 | unlock: | |
1332 | mutex_unlock(&dev_opp_list_lock); | |
e1f60b29 NM |
1333 | kfree(new_opp); |
1334 | return r; | |
1335 | } | |
1336 | ||
1337 | /** | |
5d4879cd | 1338 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
1339 | * @dev: device for which we do this operation |
1340 | * @freq: OPP frequency to enable | |
1341 | * | |
1342 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
1343 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 1344 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 NM |
1345 | * |
1346 | * Locking: The internal device_opp and opp structures are RCU protected. | |
1347 | * Hence this function indirectly uses RCU and mutex locks to keep the | |
1348 | * integrity of the internal data structures. Callers should ensure that | |
1349 | * this function is *NOT* called under RCU protection or in contexts where | |
1350 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
984f16c8 NM |
1351 | * |
1352 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
e1a2d49c | 1353 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1354 | * successful. |
e1f60b29 | 1355 | */ |
5d4879cd | 1356 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 1357 | { |
327854c8 | 1358 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 1359 | } |
5d4879cd | 1360 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
1361 | |
1362 | /** | |
5d4879cd | 1363 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
1364 | * @dev: device for which we do this operation |
1365 | * @freq: OPP frequency to disable | |
1366 | * | |
1367 | * Disables a provided opp. If the operation is valid, this returns | |
1368 | * 0, else the corresponding error value. It is meant to be a temporary | |
1369 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 1370 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 NM |
1371 | * |
1372 | * Locking: The internal device_opp and opp structures are RCU protected. | |
1373 | * Hence this function indirectly uses RCU and mutex locks to keep the | |
1374 | * integrity of the internal data structures. Callers should ensure that | |
1375 | * this function is *NOT* called under RCU protection or in contexts where | |
1376 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
984f16c8 NM |
1377 | * |
1378 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
e1a2d49c | 1379 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1380 | * successful. |
e1f60b29 | 1381 | */ |
5d4879cd | 1382 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 1383 | { |
327854c8 | 1384 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 1385 | } |
5d4879cd | 1386 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 1387 | |
03ca370f | 1388 | /** |
5d4879cd | 1389 | * dev_pm_opp_get_notifier() - find notifier_head of the device with opp |
03ca370f | 1390 | * @dev: device pointer used to lookup device OPPs. |
984f16c8 NM |
1391 | * |
1392 | * Return: pointer to notifier head if found, otherwise -ENODEV or | |
1393 | * -EINVAL based on type of error casted as pointer. value must be checked | |
1394 | * with IS_ERR to determine valid pointer or error result. | |
1395 | * | |
1396 | * Locking: This function must be called under rcu_read_lock(). dev_opp is a RCU | |
1397 | * protected pointer. The reason for the same is that the opp pointer which is | |
1398 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
1399 | * under the locked area. The pointer returned must be used prior to unlocking | |
1400 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
03ca370f | 1401 | */ |
5d4879cd | 1402 | struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev) |
03ca370f | 1403 | { |
327854c8 | 1404 | struct device_opp *dev_opp = _find_device_opp(dev); |
03ca370f MH |
1405 | |
1406 | if (IS_ERR(dev_opp)) | |
156acb16 | 1407 | return ERR_CAST(dev_opp); /* matching type */ |
03ca370f | 1408 | |
cd1a068a | 1409 | return &dev_opp->srcu_head; |
03ca370f | 1410 | } |
4679ec37 | 1411 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier); |
b496dfbc SG |
1412 | |
1413 | #ifdef CONFIG_OF | |
1414 | /** | |
8f8d37b2 VK |
1415 | * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT |
1416 | * entries | |
b496dfbc SG |
1417 | * @dev: device pointer used to lookup device OPPs. |
1418 | * | |
737002b5 | 1419 | * Free OPPs created using static entries present in DT. |
984f16c8 NM |
1420 | * |
1421 | * Locking: The internal device_opp and opp structures are RCU protected. | |
1422 | * Hence this function indirectly uses RCU updater strategy with mutex locks | |
1423 | * to keep the integrity of the internal data structures. Callers should ensure | |
1424 | * that this function is *NOT* called under RCU protection or in contexts where | |
1425 | * mutex cannot be locked. | |
b496dfbc | 1426 | */ |
8f8d37b2 | 1427 | void dev_pm_opp_of_remove_table(struct device *dev) |
737002b5 VK |
1428 | { |
1429 | struct device_opp *dev_opp; | |
1430 | struct dev_pm_opp *opp, *tmp; | |
1431 | ||
06441658 VK |
1432 | /* Hold our list modification lock here */ |
1433 | mutex_lock(&dev_opp_list_lock); | |
1434 | ||
737002b5 VK |
1435 | /* Check for existing list for 'dev' */ |
1436 | dev_opp = _find_device_opp(dev); | |
1437 | if (IS_ERR(dev_opp)) { | |
1438 | int error = PTR_ERR(dev_opp); | |
1439 | ||
1440 | if (error != -ENODEV) | |
1441 | WARN(1, "%s: dev_opp: %d\n", | |
1442 | IS_ERR_OR_NULL(dev) ? | |
1443 | "Invalid device" : dev_name(dev), | |
1444 | error); | |
06441658 | 1445 | goto unlock; |
737002b5 VK |
1446 | } |
1447 | ||
06441658 VK |
1448 | /* Find if dev_opp manages a single device */ |
1449 | if (list_is_singular(&dev_opp->dev_list)) { | |
1450 | /* Free static OPPs */ | |
1451 | list_for_each_entry_safe(opp, tmp, &dev_opp->opp_list, node) { | |
1452 | if (!opp->dynamic) | |
1453 | _opp_remove(dev_opp, opp, true); | |
1454 | } | |
1455 | } else { | |
1456 | _remove_list_dev(_find_list_dev(dev, dev_opp), dev_opp); | |
737002b5 VK |
1457 | } |
1458 | ||
06441658 | 1459 | unlock: |
737002b5 VK |
1460 | mutex_unlock(&dev_opp_list_lock); |
1461 | } | |
8f8d37b2 | 1462 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); |
737002b5 | 1463 | |
1840995c | 1464 | /* Returns opp descriptor node for a device, caller must do of_node_put() */ |
f59d3ee8 | 1465 | struct device_node *_of_get_opp_desc_node(struct device *dev) |
8d4d4e98 | 1466 | { |
8d4d4e98 VK |
1467 | /* |
1468 | * TODO: Support for multiple OPP tables. | |
1469 | * | |
1470 | * There should be only ONE phandle present in "operating-points-v2" | |
1471 | * property. | |
1472 | */ | |
8d4d4e98 | 1473 | |
1840995c | 1474 | return of_parse_phandle(dev->of_node, "operating-points-v2", 0); |
8d4d4e98 VK |
1475 | } |
1476 | ||
27465902 | 1477 | /* Initializes OPP tables based on new bindings */ |
f0489a5e | 1478 | static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np) |
27465902 | 1479 | { |
1840995c | 1480 | struct device_node *np; |
06441658 | 1481 | struct device_opp *dev_opp; |
27465902 VK |
1482 | int ret = 0, count = 0; |
1483 | ||
4a3a1353 VK |
1484 | mutex_lock(&dev_opp_list_lock); |
1485 | ||
06441658 VK |
1486 | dev_opp = _managed_opp(opp_np); |
1487 | if (dev_opp) { | |
1488 | /* OPPs are already managed */ | |
1489 | if (!_add_list_dev(dev, dev_opp)) | |
1490 | ret = -ENOMEM; | |
4a3a1353 | 1491 | mutex_unlock(&dev_opp_list_lock); |
1840995c | 1492 | return ret; |
06441658 | 1493 | } |
4a3a1353 | 1494 | mutex_unlock(&dev_opp_list_lock); |
06441658 | 1495 | |
27465902 VK |
1496 | /* We have opp-list node now, iterate over it and add OPPs */ |
1497 | for_each_available_child_of_node(opp_np, np) { | |
1498 | count++; | |
1499 | ||
1500 | ret = _opp_add_static_v2(dev, np); | |
1501 | if (ret) { | |
1502 | dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, | |
1503 | ret); | |
1f821ed7 | 1504 | goto free_table; |
27465902 VK |
1505 | } |
1506 | } | |
1507 | ||
1508 | /* There should be one of more OPP defined */ | |
1840995c VK |
1509 | if (WARN_ON(!count)) |
1510 | return -ENOENT; | |
27465902 | 1511 | |
4a3a1353 VK |
1512 | mutex_lock(&dev_opp_list_lock); |
1513 | ||
1f821ed7 VK |
1514 | dev_opp = _find_device_opp(dev); |
1515 | if (WARN_ON(IS_ERR(dev_opp))) { | |
1516 | ret = PTR_ERR(dev_opp); | |
4a3a1353 | 1517 | mutex_unlock(&dev_opp_list_lock); |
1f821ed7 | 1518 | goto free_table; |
06441658 | 1519 | } |
27465902 | 1520 | |
1f821ed7 VK |
1521 | dev_opp->np = opp_np; |
1522 | dev_opp->shared_opp = of_property_read_bool(opp_np, "opp-shared"); | |
1523 | ||
4a3a1353 VK |
1524 | mutex_unlock(&dev_opp_list_lock); |
1525 | ||
1f821ed7 VK |
1526 | return 0; |
1527 | ||
1528 | free_table: | |
8f8d37b2 | 1529 | dev_pm_opp_of_remove_table(dev); |
27465902 VK |
1530 | |
1531 | return ret; | |
1532 | } | |
1533 | ||
1534 | /* Initializes OPP tables based on old-deprecated bindings */ | |
f0489a5e | 1535 | static int _of_add_opp_table_v1(struct device *dev) |
b496dfbc SG |
1536 | { |
1537 | const struct property *prop; | |
1538 | const __be32 *val; | |
1539 | int nr; | |
1540 | ||
1541 | prop = of_find_property(dev->of_node, "operating-points", NULL); | |
1542 | if (!prop) | |
1543 | return -ENODEV; | |
1544 | if (!prop->value) | |
1545 | return -ENODATA; | |
1546 | ||
1547 | /* | |
1548 | * Each OPP is a set of tuples consisting of frequency and | |
1549 | * voltage like <freq-kHz vol-uV>. | |
1550 | */ | |
1551 | nr = prop->length / sizeof(u32); | |
1552 | if (nr % 2) { | |
1553 | dev_err(dev, "%s: Invalid OPP list\n", __func__); | |
1554 | return -EINVAL; | |
1555 | } | |
1556 | ||
1557 | val = prop->value; | |
1558 | while (nr) { | |
1559 | unsigned long freq = be32_to_cpup(val++) * 1000; | |
1560 | unsigned long volt = be32_to_cpup(val++); | |
1561 | ||
b64b9c3f | 1562 | if (_opp_add_v1(dev, freq, volt, false)) |
b496dfbc SG |
1563 | dev_warn(dev, "%s: Failed to add OPP %ld\n", |
1564 | __func__, freq); | |
b496dfbc SG |
1565 | nr -= 2; |
1566 | } | |
1567 | ||
1568 | return 0; | |
1569 | } | |
129eec55 VK |
1570 | |
1571 | /** | |
8f8d37b2 | 1572 | * dev_pm_opp_of_add_table() - Initialize opp table from device tree |
129eec55 VK |
1573 | * @dev: device pointer used to lookup device OPPs. |
1574 | * | |
27465902 | 1575 | * Register the initial OPP table with the OPP library for given device. |
984f16c8 NM |
1576 | * |
1577 | * Locking: The internal device_opp and opp structures are RCU protected. | |
1578 | * Hence this function indirectly uses RCU updater strategy with mutex locks | |
1579 | * to keep the integrity of the internal data structures. Callers should ensure | |
1580 | * that this function is *NOT* called under RCU protection or in contexts where | |
1581 | * mutex cannot be locked. | |
27465902 VK |
1582 | * |
1583 | * Return: | |
1584 | * 0 On success OR | |
1585 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1586 | * -EEXIST Freq are same and volt are different OR | |
1587 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1588 | * -ENOMEM Memory allocation failure | |
1589 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
1590 | * in device node. | |
1591 | * -ENODATA when empty 'operating-points' property is found | |
1592 | * -EINVAL when invalid entries are found in opp-v2 table | |
129eec55 | 1593 | */ |
8f8d37b2 | 1594 | int dev_pm_opp_of_add_table(struct device *dev) |
129eec55 | 1595 | { |
1840995c VK |
1596 | struct device_node *opp_np; |
1597 | int ret; | |
27465902 VK |
1598 | |
1599 | /* | |
1600 | * OPPs have two version of bindings now. The older one is deprecated, | |
1601 | * try for the new binding first. | |
1602 | */ | |
1840995c VK |
1603 | opp_np = _of_get_opp_desc_node(dev); |
1604 | if (!opp_np) { | |
27465902 VK |
1605 | /* |
1606 | * Try old-deprecated bindings for backward compatibility with | |
1607 | * older dtbs. | |
1608 | */ | |
f0489a5e | 1609 | return _of_add_opp_table_v1(dev); |
8d4d4e98 VK |
1610 | } |
1611 | ||
f0489a5e | 1612 | ret = _of_add_opp_table_v2(dev, opp_np); |
1840995c | 1613 | of_node_put(opp_np); |
8d4d4e98 | 1614 | |
8d4d4e98 VK |
1615 | return ret; |
1616 | } | |
8f8d37b2 | 1617 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); |
b496dfbc | 1618 | #endif |