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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 | ||
d54974c2 | 16 | #include <linux/clk.h> |
e1f60b29 NM |
17 | #include <linux/errno.h> |
18 | #include <linux/err.h> | |
e1f60b29 | 19 | #include <linux/slab.h> |
51990e82 | 20 | #include <linux/device.h> |
80126ce7 | 21 | #include <linux/export.h> |
009acd19 | 22 | #include <linux/pm_domain.h> |
9f8ea969 | 23 | #include <linux/regulator/consumer.h> |
e1f60b29 | 24 | |
f59d3ee8 | 25 | #include "opp.h" |
e1f60b29 NM |
26 | |
27 | /* | |
2c2709dc VK |
28 | * The root of the list of all opp-tables. All opp_table structures branch off |
29 | * from here, with each opp_table containing the list of opps it supports in | |
e1f60b29 NM |
30 | * various states of availability. |
31 | */ | |
f47b72a1 | 32 | LIST_HEAD(opp_tables); |
e1f60b29 | 33 | /* Lock to allow exclusive modification to the device and opp lists */ |
2c2709dc | 34 | DEFINE_MUTEX(opp_table_lock); |
e1f60b29 | 35 | |
2c2709dc VK |
36 | static struct opp_device *_find_opp_dev(const struct device *dev, |
37 | struct opp_table *opp_table) | |
06441658 | 38 | { |
2c2709dc | 39 | struct opp_device *opp_dev; |
06441658 | 40 | |
2c2709dc VK |
41 | list_for_each_entry(opp_dev, &opp_table->dev_list, node) |
42 | if (opp_dev->dev == dev) | |
43 | return opp_dev; | |
06441658 VK |
44 | |
45 | return NULL; | |
46 | } | |
47 | ||
6ac42397 | 48 | static struct opp_table *_find_opp_table_unlocked(struct device *dev) |
5b650b38 VK |
49 | { |
50 | struct opp_table *opp_table; | |
3d255699 | 51 | bool found; |
5b650b38 VK |
52 | |
53 | list_for_each_entry(opp_table, &opp_tables, node) { | |
3d255699 VK |
54 | mutex_lock(&opp_table->lock); |
55 | found = !!_find_opp_dev(dev, opp_table); | |
56 | mutex_unlock(&opp_table->lock); | |
57 | ||
58 | if (found) { | |
5b650b38 VK |
59 | _get_opp_table_kref(opp_table); |
60 | ||
61 | return opp_table; | |
62 | } | |
63 | } | |
64 | ||
65 | return ERR_PTR(-ENODEV); | |
66 | } | |
67 | ||
e1f60b29 | 68 | /** |
2c2709dc VK |
69 | * _find_opp_table() - find opp_table struct using device pointer |
70 | * @dev: device pointer used to lookup OPP table | |
e1f60b29 | 71 | * |
052c6f19 | 72 | * Search OPP table for one containing matching device. |
e1f60b29 | 73 | * |
2c2709dc | 74 | * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or |
e1f60b29 NM |
75 | * -EINVAL based on type of error. |
76 | * | |
5b650b38 | 77 | * The callers must call dev_pm_opp_put_opp_table() after the table is used. |
e1f60b29 | 78 | */ |
2c2709dc | 79 | struct opp_table *_find_opp_table(struct device *dev) |
e1f60b29 | 80 | { |
2c2709dc | 81 | struct opp_table *opp_table; |
e1f60b29 | 82 | |
50a3cb04 | 83 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
84 | pr_err("%s: Invalid parameters\n", __func__); |
85 | return ERR_PTR(-EINVAL); | |
86 | } | |
87 | ||
5b650b38 VK |
88 | mutex_lock(&opp_table_lock); |
89 | opp_table = _find_opp_table_unlocked(dev); | |
90 | mutex_unlock(&opp_table_lock); | |
e1f60b29 | 91 | |
5b650b38 | 92 | return opp_table; |
e1f60b29 NM |
93 | } |
94 | ||
95 | /** | |
d6d00742 | 96 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
97 | * @opp: opp for which voltage has to be returned for |
98 | * | |
984f16c8 | 99 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
100 | * return 0 |
101 | * | |
dfbe4678 | 102 | * This is useful only for devices with single power supply. |
e1f60b29 | 103 | */ |
47d43ba7 | 104 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 105 | { |
052c6f19 | 106 | if (IS_ERR_OR_NULL(opp)) { |
e1f60b29 | 107 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
108 | return 0; |
109 | } | |
e1f60b29 | 110 | |
052c6f19 | 111 | return opp->supplies[0].u_volt; |
e1f60b29 | 112 | } |
5d4879cd | 113 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
114 | |
115 | /** | |
5d4879cd | 116 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
117 | * @opp: opp for which frequency has to be returned for |
118 | * | |
984f16c8 | 119 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 | 120 | * return 0 |
e1f60b29 | 121 | */ |
47d43ba7 | 122 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 123 | { |
052c6f19 | 124 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
e1f60b29 | 125 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
126 | return 0; |
127 | } | |
e1f60b29 | 128 | |
052c6f19 | 129 | return opp->rate; |
e1f60b29 | 130 | } |
5d4879cd | 131 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 132 | |
5b93ac54 RN |
133 | /** |
134 | * dev_pm_opp_get_level() - Gets the level corresponding to an available opp | |
135 | * @opp: opp for which level value has to be returned for | |
136 | * | |
137 | * Return: level read from device tree corresponding to the opp, else | |
138 | * return 0. | |
139 | */ | |
140 | unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp) | |
141 | { | |
142 | if (IS_ERR_OR_NULL(opp) || !opp->available) { | |
143 | pr_err("%s: Invalid parameters\n", __func__); | |
144 | return 0; | |
145 | } | |
146 | ||
147 | return opp->level; | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_level); | |
150 | ||
19445b25 BZ |
151 | /** |
152 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
153 | * @opp: opp for which turbo mode is being verified | |
154 | * | |
155 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
156 | * conditions) for short duration of times to finish high throughput work | |
157 | * quickly. Running on them for longer times may overheat the chip. | |
158 | * | |
159 | * Return: true if opp is turbo opp, else false. | |
19445b25 BZ |
160 | */ |
161 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
162 | { | |
052c6f19 | 163 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
19445b25 BZ |
164 | pr_err("%s: Invalid parameters\n", __func__); |
165 | return false; | |
166 | } | |
167 | ||
052c6f19 | 168 | return opp->turbo; |
19445b25 BZ |
169 | } |
170 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
171 | ||
3ca9bb33 VK |
172 | /** |
173 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
174 | * @dev: device for which we do this operation | |
175 | * | |
176 | * Return: This function returns the max clock latency in nanoseconds. | |
3ca9bb33 VK |
177 | */ |
178 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
179 | { | |
2c2709dc | 180 | struct opp_table *opp_table; |
3ca9bb33 VK |
181 | unsigned long clock_latency_ns; |
182 | ||
2c2709dc VK |
183 | opp_table = _find_opp_table(dev); |
184 | if (IS_ERR(opp_table)) | |
5b650b38 VK |
185 | return 0; |
186 | ||
187 | clock_latency_ns = opp_table->clock_latency_ns_max; | |
188 | ||
189 | dev_pm_opp_put_opp_table(opp_table); | |
3ca9bb33 | 190 | |
3ca9bb33 VK |
191 | return clock_latency_ns; |
192 | } | |
193 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
194 | ||
655c9df9 VK |
195 | /** |
196 | * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds | |
197 | * @dev: device for which we do this operation | |
198 | * | |
199 | * Return: This function returns the max voltage latency in nanoseconds. | |
655c9df9 VK |
200 | */ |
201 | unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) | |
202 | { | |
2c2709dc | 203 | struct opp_table *opp_table; |
655c9df9 | 204 | struct dev_pm_opp *opp; |
478256bd | 205 | struct regulator *reg; |
655c9df9 | 206 | unsigned long latency_ns = 0; |
dfbe4678 VK |
207 | int ret, i, count; |
208 | struct { | |
209 | unsigned long min; | |
210 | unsigned long max; | |
211 | } *uV; | |
212 | ||
cdd3e614 VK |
213 | opp_table = _find_opp_table(dev); |
214 | if (IS_ERR(opp_table)) | |
215 | return 0; | |
216 | ||
dfbe4678 | 217 | /* Regulator may not be required for the device */ |
90e3577b | 218 | if (!opp_table->regulators) |
cdd3e614 | 219 | goto put_opp_table; |
dfbe4678 | 220 | |
90e3577b VK |
221 | count = opp_table->regulator_count; |
222 | ||
dfbe4678 VK |
223 | uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); |
224 | if (!uV) | |
478256bd | 225 | goto put_opp_table; |
655c9df9 | 226 | |
052c6f19 VK |
227 | mutex_lock(&opp_table->lock); |
228 | ||
dfbe4678 VK |
229 | for (i = 0; i < count; i++) { |
230 | uV[i].min = ~0; | |
231 | uV[i].max = 0; | |
655c9df9 | 232 | |
052c6f19 | 233 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
dfbe4678 VK |
234 | if (!opp->available) |
235 | continue; | |
236 | ||
237 | if (opp->supplies[i].u_volt_min < uV[i].min) | |
238 | uV[i].min = opp->supplies[i].u_volt_min; | |
239 | if (opp->supplies[i].u_volt_max > uV[i].max) | |
240 | uV[i].max = opp->supplies[i].u_volt_max; | |
241 | } | |
655c9df9 VK |
242 | } |
243 | ||
052c6f19 | 244 | mutex_unlock(&opp_table->lock); |
655c9df9 VK |
245 | |
246 | /* | |
2c2709dc | 247 | * The caller needs to ensure that opp_table (and hence the regulator) |
655c9df9 VK |
248 | * isn't freed, while we are executing this routine. |
249 | */ | |
8cc31116 | 250 | for (i = 0; i < count; i++) { |
478256bd | 251 | reg = opp_table->regulators[i]; |
dfbe4678 VK |
252 | ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); |
253 | if (ret > 0) | |
254 | latency_ns += ret * 1000; | |
255 | } | |
256 | ||
dfbe4678 | 257 | kfree(uV); |
cdd3e614 VK |
258 | put_opp_table: |
259 | dev_pm_opp_put_opp_table(opp_table); | |
655c9df9 VK |
260 | |
261 | return latency_ns; | |
262 | } | |
263 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); | |
264 | ||
21743447 VK |
265 | /** |
266 | * dev_pm_opp_get_max_transition_latency() - Get max transition latency in | |
267 | * nanoseconds | |
268 | * @dev: device for which we do this operation | |
269 | * | |
270 | * Return: This function returns the max transition latency, in nanoseconds, to | |
271 | * switch from one OPP to other. | |
21743447 VK |
272 | */ |
273 | unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) | |
274 | { | |
275 | return dev_pm_opp_get_max_volt_latency(dev) + | |
276 | dev_pm_opp_get_max_clock_latency(dev); | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); | |
279 | ||
4eafbd15 | 280 | /** |
3aa26a3b | 281 | * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz |
4eafbd15 BZ |
282 | * @dev: device for which we do this operation |
283 | * | |
3aa26a3b VK |
284 | * Return: This function returns the frequency of the OPP marked as suspend_opp |
285 | * if one is available, else returns 0; | |
4eafbd15 | 286 | */ |
3aa26a3b | 287 | unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev) |
4eafbd15 | 288 | { |
2c2709dc | 289 | struct opp_table *opp_table; |
3aa26a3b | 290 | unsigned long freq = 0; |
4eafbd15 | 291 | |
2c2709dc | 292 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
293 | if (IS_ERR(opp_table)) |
294 | return 0; | |
3aa26a3b | 295 | |
5b650b38 VK |
296 | if (opp_table->suspend_opp && opp_table->suspend_opp->available) |
297 | freq = dev_pm_opp_get_freq(opp_table->suspend_opp); | |
298 | ||
299 | dev_pm_opp_put_opp_table(opp_table); | |
4eafbd15 | 300 | |
3aa26a3b | 301 | return freq; |
4eafbd15 | 302 | } |
3aa26a3b | 303 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq); |
4eafbd15 | 304 | |
a1e8c136 VK |
305 | int _get_opp_count(struct opp_table *opp_table) |
306 | { | |
307 | struct dev_pm_opp *opp; | |
308 | int count = 0; | |
309 | ||
310 | mutex_lock(&opp_table->lock); | |
311 | ||
312 | list_for_each_entry(opp, &opp_table->opp_list, node) { | |
313 | if (opp->available) | |
314 | count++; | |
315 | } | |
316 | ||
317 | mutex_unlock(&opp_table->lock); | |
318 | ||
319 | return count; | |
320 | } | |
321 | ||
e1f60b29 | 322 | /** |
2c2709dc | 323 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table |
e1f60b29 NM |
324 | * @dev: device for which we do this operation |
325 | * | |
984f16c8 | 326 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 | 327 | * else returns 0 if none or the corresponding error value. |
e1f60b29 | 328 | */ |
5d4879cd | 329 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 | 330 | { |
2c2709dc | 331 | struct opp_table *opp_table; |
a1e8c136 | 332 | int count; |
e1f60b29 | 333 | |
2c2709dc VK |
334 | opp_table = _find_opp_table(dev); |
335 | if (IS_ERR(opp_table)) { | |
336 | count = PTR_ERR(opp_table); | |
035ed072 | 337 | dev_dbg(dev, "%s: OPP table not found (%d)\n", |
b4718c02 | 338 | __func__, count); |
09f662f9 | 339 | return count; |
e1f60b29 NM |
340 | } |
341 | ||
a1e8c136 | 342 | count = _get_opp_count(opp_table); |
5b650b38 VK |
343 | dev_pm_opp_put_opp_table(opp_table); |
344 | ||
e1f60b29 NM |
345 | return count; |
346 | } | |
5d4879cd | 347 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
348 | |
349 | /** | |
5d4879cd | 350 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
351 | * @dev: device for which we do this operation |
352 | * @freq: frequency to search for | |
7ae49618 | 353 | * @available: true/false - match for available opp |
e1f60b29 | 354 | * |
2c2709dc | 355 | * Return: Searches for exact match in the opp table and returns pointer to the |
984f16c8 NM |
356 | * matching opp if found, else returns ERR_PTR in case of error and should |
357 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
358 | * EINVAL: for bad pointer |
359 | * ERANGE: no match found for search | |
360 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
361 | * |
362 | * Note: available is a modifier for the search. if available=true, then the | |
363 | * match is for exact matching frequency and is available in the stored OPP | |
364 | * table. if false, the match is for exact frequency which is not available. | |
365 | * | |
366 | * This provides a mechanism to enable an opp which is not available currently | |
367 | * or the opposite as well. | |
368 | * | |
8a31d9d9 VK |
369 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
370 | * use. | |
e1f60b29 | 371 | */ |
47d43ba7 NM |
372 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
373 | unsigned long freq, | |
374 | bool available) | |
e1f60b29 | 375 | { |
2c2709dc | 376 | struct opp_table *opp_table; |
47d43ba7 | 377 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 378 | |
2c2709dc VK |
379 | opp_table = _find_opp_table(dev); |
380 | if (IS_ERR(opp_table)) { | |
381 | int r = PTR_ERR(opp_table); | |
382 | ||
383 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
e1f60b29 NM |
384 | return ERR_PTR(r); |
385 | } | |
386 | ||
052c6f19 | 387 | mutex_lock(&opp_table->lock); |
5b650b38 | 388 | |
052c6f19 | 389 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
390 | if (temp_opp->available == available && |
391 | temp_opp->rate == freq) { | |
392 | opp = temp_opp; | |
8a31d9d9 VK |
393 | |
394 | /* Increment the reference count of OPP */ | |
395 | dev_pm_opp_get(opp); | |
e1f60b29 NM |
396 | break; |
397 | } | |
398 | } | |
399 | ||
052c6f19 | 400 | mutex_unlock(&opp_table->lock); |
5b650b38 | 401 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 402 | |
e1f60b29 NM |
403 | return opp; |
404 | } | |
5d4879cd | 405 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 | 406 | |
067b7ce0 JZ |
407 | static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, |
408 | unsigned long *freq) | |
409 | { | |
410 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
411 | ||
052c6f19 VK |
412 | mutex_lock(&opp_table->lock); |
413 | ||
414 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
067b7ce0 JZ |
415 | if (temp_opp->available && temp_opp->rate >= *freq) { |
416 | opp = temp_opp; | |
417 | *freq = opp->rate; | |
8a31d9d9 VK |
418 | |
419 | /* Increment the reference count of OPP */ | |
420 | dev_pm_opp_get(opp); | |
067b7ce0 JZ |
421 | break; |
422 | } | |
423 | } | |
424 | ||
052c6f19 VK |
425 | mutex_unlock(&opp_table->lock); |
426 | ||
067b7ce0 JZ |
427 | return opp; |
428 | } | |
429 | ||
e1f60b29 | 430 | /** |
5d4879cd | 431 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
432 | * @dev: device for which we do this operation |
433 | * @freq: Start frequency | |
434 | * | |
435 | * Search for the matching ceil *available* OPP from a starting freq | |
436 | * for a device. | |
437 | * | |
984f16c8 | 438 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
439 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
440 | * values can be: | |
441 | * EINVAL: for bad pointer | |
442 | * ERANGE: no match found for search | |
443 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 444 | * |
8a31d9d9 VK |
445 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
446 | * use. | |
e1f60b29 | 447 | */ |
47d43ba7 NM |
448 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
449 | unsigned long *freq) | |
e1f60b29 | 450 | { |
2c2709dc | 451 | struct opp_table *opp_table; |
8a31d9d9 | 452 | struct dev_pm_opp *opp; |
b02ded24 | 453 | |
e1f60b29 NM |
454 | if (!dev || !freq) { |
455 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
456 | return ERR_PTR(-EINVAL); | |
457 | } | |
458 | ||
2c2709dc | 459 | opp_table = _find_opp_table(dev); |
5b650b38 | 460 | if (IS_ERR(opp_table)) |
2c2709dc | 461 | return ERR_CAST(opp_table); |
5b650b38 | 462 | |
8a31d9d9 | 463 | opp = _find_freq_ceil(opp_table, freq); |
e1f60b29 | 464 | |
5b650b38 | 465 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 VK |
466 | |
467 | return opp; | |
e1f60b29 | 468 | } |
5d4879cd | 469 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
470 | |
471 | /** | |
5d4879cd | 472 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
473 | * @dev: device for which we do this operation |
474 | * @freq: Start frequency | |
475 | * | |
476 | * Search for the matching floor *available* OPP from a starting freq | |
477 | * for a device. | |
478 | * | |
984f16c8 | 479 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
480 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
481 | * values can be: | |
482 | * EINVAL: for bad pointer | |
483 | * ERANGE: no match found for search | |
484 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 485 | * |
8a31d9d9 VK |
486 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
487 | * use. | |
e1f60b29 | 488 | */ |
47d43ba7 NM |
489 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
490 | unsigned long *freq) | |
e1f60b29 | 491 | { |
2c2709dc | 492 | struct opp_table *opp_table; |
47d43ba7 | 493 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 NM |
494 | |
495 | if (!dev || !freq) { | |
496 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
497 | return ERR_PTR(-EINVAL); | |
498 | } | |
499 | ||
2c2709dc | 500 | opp_table = _find_opp_table(dev); |
5b650b38 | 501 | if (IS_ERR(opp_table)) |
2c2709dc | 502 | return ERR_CAST(opp_table); |
5b650b38 | 503 | |
052c6f19 | 504 | mutex_lock(&opp_table->lock); |
e1f60b29 | 505 | |
052c6f19 | 506 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
507 | if (temp_opp->available) { |
508 | /* go to the next node, before choosing prev */ | |
509 | if (temp_opp->rate > *freq) | |
510 | break; | |
511 | else | |
512 | opp = temp_opp; | |
513 | } | |
514 | } | |
8a31d9d9 VK |
515 | |
516 | /* Increment the reference count of OPP */ | |
517 | if (!IS_ERR(opp)) | |
518 | dev_pm_opp_get(opp); | |
052c6f19 | 519 | mutex_unlock(&opp_table->lock); |
5b650b38 | 520 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 521 | |
e1f60b29 NM |
522 | if (!IS_ERR(opp)) |
523 | *freq = opp->rate; | |
524 | ||
525 | return opp; | |
526 | } | |
5d4879cd | 527 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 528 | |
6a0712f6 | 529 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, |
ce31781a | 530 | struct dev_pm_opp_supply *supply) |
6a0712f6 VK |
531 | { |
532 | int ret; | |
533 | ||
534 | /* Regulator not available for device */ | |
535 | if (IS_ERR(reg)) { | |
536 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
537 | PTR_ERR(reg)); | |
538 | return 0; | |
539 | } | |
540 | ||
ce31781a VK |
541 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, |
542 | supply->u_volt_min, supply->u_volt, supply->u_volt_max); | |
6a0712f6 | 543 | |
ce31781a VK |
544 | ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, |
545 | supply->u_volt, supply->u_volt_max); | |
6a0712f6 VK |
546 | if (ret) |
547 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
ce31781a VK |
548 | __func__, supply->u_volt_min, supply->u_volt, |
549 | supply->u_volt_max, ret); | |
6a0712f6 VK |
550 | |
551 | return ret; | |
552 | } | |
553 | ||
285881b5 VK |
554 | static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk, |
555 | unsigned long freq) | |
94735585 VK |
556 | { |
557 | int ret; | |
558 | ||
559 | ret = clk_set_rate(clk, freq); | |
560 | if (ret) { | |
561 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
562 | ret); | |
563 | } | |
564 | ||
565 | return ret; | |
566 | } | |
567 | ||
c74b32fa VK |
568 | static int _generic_set_opp_regulator(const struct opp_table *opp_table, |
569 | struct device *dev, | |
570 | unsigned long old_freq, | |
571 | unsigned long freq, | |
572 | struct dev_pm_opp_supply *old_supply, | |
573 | struct dev_pm_opp_supply *new_supply) | |
94735585 | 574 | { |
c74b32fa | 575 | struct regulator *reg = opp_table->regulators[0]; |
94735585 VK |
576 | int ret; |
577 | ||
578 | /* This function only supports single regulator per device */ | |
c74b32fa | 579 | if (WARN_ON(opp_table->regulator_count > 1)) { |
94735585 VK |
580 | dev_err(dev, "multiple regulators are not supported\n"); |
581 | return -EINVAL; | |
582 | } | |
583 | ||
584 | /* Scaling up? Scale voltage before frequency */ | |
c5c2a97b | 585 | if (freq >= old_freq) { |
94735585 VK |
586 | ret = _set_opp_voltage(dev, reg, new_supply); |
587 | if (ret) | |
588 | goto restore_voltage; | |
589 | } | |
590 | ||
591 | /* Change frequency */ | |
285881b5 | 592 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq); |
94735585 VK |
593 | if (ret) |
594 | goto restore_voltage; | |
595 | ||
596 | /* Scaling down? Scale voltage after frequency */ | |
597 | if (freq < old_freq) { | |
598 | ret = _set_opp_voltage(dev, reg, new_supply); | |
599 | if (ret) | |
600 | goto restore_freq; | |
601 | } | |
602 | ||
603 | return 0; | |
604 | ||
605 | restore_freq: | |
285881b5 | 606 | if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq)) |
94735585 VK |
607 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
608 | __func__, old_freq); | |
609 | restore_voltage: | |
610 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
c74b32fa | 611 | if (old_supply) |
94735585 VK |
612 | _set_opp_voltage(dev, reg, old_supply); |
613 | ||
614 | return ret; | |
615 | } | |
616 | ||
7e535993 VK |
617 | static int _set_opp_custom(const struct opp_table *opp_table, |
618 | struct device *dev, unsigned long old_freq, | |
619 | unsigned long freq, | |
620 | struct dev_pm_opp_supply *old_supply, | |
621 | struct dev_pm_opp_supply *new_supply) | |
622 | { | |
623 | struct dev_pm_set_opp_data *data; | |
624 | int size; | |
625 | ||
626 | data = opp_table->set_opp_data; | |
627 | data->regulators = opp_table->regulators; | |
628 | data->regulator_count = opp_table->regulator_count; | |
629 | data->clk = opp_table->clk; | |
630 | data->dev = dev; | |
631 | ||
632 | data->old_opp.rate = old_freq; | |
633 | size = sizeof(*old_supply) * opp_table->regulator_count; | |
634 | if (IS_ERR(old_supply)) | |
635 | memset(data->old_opp.supplies, 0, size); | |
636 | else | |
637 | memcpy(data->old_opp.supplies, old_supply, size); | |
638 | ||
639 | data->new_opp.rate = freq; | |
640 | memcpy(data->new_opp.supplies, new_supply, size); | |
641 | ||
642 | return opp_table->set_opp(data); | |
643 | } | |
644 | ||
ca1b5d77 VK |
645 | /* This is only called for PM domain for now */ |
646 | static int _set_required_opps(struct device *dev, | |
647 | struct opp_table *opp_table, | |
648 | struct dev_pm_opp *opp) | |
649 | { | |
650 | struct opp_table **required_opp_tables = opp_table->required_opp_tables; | |
651 | struct device **genpd_virt_devs = opp_table->genpd_virt_devs; | |
652 | unsigned int pstate; | |
653 | int i, ret = 0; | |
654 | ||
655 | if (!required_opp_tables) | |
656 | return 0; | |
657 | ||
658 | /* Single genpd case */ | |
659 | if (!genpd_virt_devs) { | |
660 | pstate = opp->required_opps[0]->pstate; | |
661 | ret = dev_pm_genpd_set_performance_state(dev, pstate); | |
662 | if (ret) { | |
663 | dev_err(dev, "Failed to set performance state of %s: %d (%d)\n", | |
664 | dev_name(dev), pstate, ret); | |
665 | } | |
666 | return ret; | |
667 | } | |
668 | ||
669 | /* Multiple genpd case */ | |
670 | ||
671 | /* | |
672 | * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev | |
673 | * after it is freed from another thread. | |
674 | */ | |
675 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
676 | ||
677 | for (i = 0; i < opp_table->required_opp_count; i++) { | |
678 | pstate = opp->required_opps[i]->pstate; | |
679 | ||
680 | if (!genpd_virt_devs[i]) | |
681 | continue; | |
682 | ||
683 | ret = dev_pm_genpd_set_performance_state(genpd_virt_devs[i], pstate); | |
684 | if (ret) { | |
685 | dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n", | |
686 | dev_name(genpd_virt_devs[i]), pstate, ret); | |
687 | break; | |
688 | } | |
689 | } | |
690 | mutex_unlock(&opp_table->genpd_virt_dev_lock); | |
691 | ||
692 | return ret; | |
693 | } | |
694 | ||
6a0712f6 VK |
695 | /** |
696 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
697 | * @dev: device for which we do this operation | |
698 | * @target_freq: frequency to achieve | |
699 | * | |
700 | * This configures the power-supplies and clock source to the levels specified | |
701 | * by the OPP corresponding to the target_freq. | |
6a0712f6 VK |
702 | */ |
703 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
704 | { | |
2c2709dc | 705 | struct opp_table *opp_table; |
94735585 | 706 | unsigned long freq, old_freq; |
6a0712f6 | 707 | struct dev_pm_opp *old_opp, *opp; |
6a0712f6 | 708 | struct clk *clk; |
7e535993 | 709 | int ret; |
6a0712f6 VK |
710 | |
711 | if (unlikely(!target_freq)) { | |
712 | dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, | |
713 | target_freq); | |
714 | return -EINVAL; | |
715 | } | |
716 | ||
052c6f19 VK |
717 | opp_table = _find_opp_table(dev); |
718 | if (IS_ERR(opp_table)) { | |
719 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); | |
720 | return PTR_ERR(opp_table); | |
721 | } | |
722 | ||
723 | clk = opp_table->clk; | |
724 | if (IS_ERR(clk)) { | |
725 | dev_err(dev, "%s: No clock available for the device\n", | |
726 | __func__); | |
727 | ret = PTR_ERR(clk); | |
728 | goto put_opp_table; | |
729 | } | |
6a0712f6 VK |
730 | |
731 | freq = clk_round_rate(clk, target_freq); | |
732 | if ((long)freq <= 0) | |
733 | freq = target_freq; | |
734 | ||
735 | old_freq = clk_get_rate(clk); | |
736 | ||
737 | /* Return early if nothing to do */ | |
738 | if (old_freq == freq) { | |
739 | dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", | |
740 | __func__, freq); | |
052c6f19 VK |
741 | ret = 0; |
742 | goto put_opp_table; | |
6a0712f6 VK |
743 | } |
744 | ||
067b7ce0 | 745 | old_opp = _find_freq_ceil(opp_table, &old_freq); |
4df27c91 | 746 | if (IS_ERR(old_opp)) { |
6a0712f6 VK |
747 | dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", |
748 | __func__, old_freq, PTR_ERR(old_opp)); | |
749 | } | |
750 | ||
067b7ce0 | 751 | opp = _find_freq_ceil(opp_table, &freq); |
6a0712f6 VK |
752 | if (IS_ERR(opp)) { |
753 | ret = PTR_ERR(opp); | |
754 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
755 | __func__, freq, ret); | |
052c6f19 | 756 | goto put_old_opp; |
6a0712f6 VK |
757 | } |
758 | ||
94735585 VK |
759 | dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, |
760 | old_freq, freq); | |
dfbe4678 | 761 | |
ca1b5d77 VK |
762 | /* Scaling up? Configure required OPPs before frequency */ |
763 | if (freq > old_freq) { | |
764 | ret = _set_required_opps(dev, opp_table, opp); | |
765 | if (ret) | |
766 | goto put_opp; | |
767 | } | |
768 | ||
7e535993 VK |
769 | if (opp_table->set_opp) { |
770 | ret = _set_opp_custom(opp_table, dev, old_freq, freq, | |
771 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
772 | opp->supplies); | |
773 | } else if (opp_table->regulators) { | |
c74b32fa VK |
774 | ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq, |
775 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
776 | opp->supplies); | |
777 | } else { | |
7e535993 | 778 | /* Only frequency scaling */ |
285881b5 | 779 | ret = _generic_set_opp_clk_only(dev, clk, freq); |
ca1b5d77 | 780 | } |
c74b32fa | 781 | |
ca1b5d77 VK |
782 | /* Scaling down? Configure required OPPs after frequency */ |
783 | if (!ret && freq < old_freq) { | |
784 | ret = _set_required_opps(dev, opp_table, opp); | |
785 | if (ret) | |
786 | dev_err(dev, "Failed to set required opps: %d\n", ret); | |
dfbe4678 VK |
787 | } |
788 | ||
ca1b5d77 | 789 | put_opp: |
8a31d9d9 | 790 | dev_pm_opp_put(opp); |
052c6f19 | 791 | put_old_opp: |
8a31d9d9 VK |
792 | if (!IS_ERR(old_opp)) |
793 | dev_pm_opp_put(old_opp); | |
052c6f19 | 794 | put_opp_table: |
5b650b38 | 795 | dev_pm_opp_put_opp_table(opp_table); |
052c6f19 | 796 | return ret; |
6a0712f6 VK |
797 | } |
798 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
799 | ||
2c2709dc | 800 | /* OPP-dev Helpers */ |
2c2709dc VK |
801 | static void _remove_opp_dev(struct opp_device *opp_dev, |
802 | struct opp_table *opp_table) | |
06441658 | 803 | { |
2c2709dc VK |
804 | opp_debug_unregister(opp_dev, opp_table); |
805 | list_del(&opp_dev->node); | |
052c6f19 | 806 | kfree(opp_dev); |
06441658 VK |
807 | } |
808 | ||
283d55e6 VK |
809 | static struct opp_device *_add_opp_dev_unlocked(const struct device *dev, |
810 | struct opp_table *opp_table) | |
06441658 | 811 | { |
2c2709dc | 812 | struct opp_device *opp_dev; |
06441658 | 813 | |
2c2709dc VK |
814 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
815 | if (!opp_dev) | |
06441658 VK |
816 | return NULL; |
817 | ||
2c2709dc VK |
818 | /* Initialize opp-dev */ |
819 | opp_dev->dev = dev; | |
3d255699 | 820 | |
052c6f19 | 821 | list_add(&opp_dev->node, &opp_table->dev_list); |
06441658 | 822 | |
2c2709dc | 823 | /* Create debugfs entries for the opp_table */ |
a2dea4cb | 824 | opp_debug_register(opp_dev, opp_table); |
283d55e6 VK |
825 | |
826 | return opp_dev; | |
827 | } | |
828 | ||
829 | struct opp_device *_add_opp_dev(const struct device *dev, | |
830 | struct opp_table *opp_table) | |
831 | { | |
832 | struct opp_device *opp_dev; | |
833 | ||
834 | mutex_lock(&opp_table->lock); | |
835 | opp_dev = _add_opp_dev_unlocked(dev, opp_table); | |
3d255699 | 836 | mutex_unlock(&opp_table->lock); |
deaa5146 | 837 | |
2c2709dc | 838 | return opp_dev; |
06441658 VK |
839 | } |
840 | ||
eb7c8743 | 841 | static struct opp_table *_allocate_opp_table(struct device *dev, int index) |
07cce74a | 842 | { |
2c2709dc VK |
843 | struct opp_table *opp_table; |
844 | struct opp_device *opp_dev; | |
d54974c2 | 845 | int ret; |
07cce74a VK |
846 | |
847 | /* | |
2c2709dc | 848 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
849 | * device is needed to be added, we pay this penalty. |
850 | */ | |
2c2709dc VK |
851 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
852 | if (!opp_table) | |
07cce74a VK |
853 | return NULL; |
854 | ||
3d255699 | 855 | mutex_init(&opp_table->lock); |
4f018bc0 | 856 | mutex_init(&opp_table->genpd_virt_dev_lock); |
2c2709dc | 857 | INIT_LIST_HEAD(&opp_table->dev_list); |
06441658 | 858 | |
46f48aca VK |
859 | /* Mark regulator count uninitialized */ |
860 | opp_table->regulator_count = -1; | |
861 | ||
2c2709dc VK |
862 | opp_dev = _add_opp_dev(dev, opp_table); |
863 | if (!opp_dev) { | |
864 | kfree(opp_table); | |
06441658 VK |
865 | return NULL; |
866 | } | |
867 | ||
eb7c8743 | 868 | _of_init_opp_table(opp_table, dev, index); |
50f8cfbd | 869 | |
d54974c2 | 870 | /* Find clk for the device */ |
2c2709dc VK |
871 | opp_table->clk = clk_get(dev, NULL); |
872 | if (IS_ERR(opp_table->clk)) { | |
873 | ret = PTR_ERR(opp_table->clk); | |
d54974c2 VK |
874 | if (ret != -EPROBE_DEFER) |
875 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, | |
876 | ret); | |
877 | } | |
878 | ||
052c6f19 | 879 | BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head); |
2c2709dc | 880 | INIT_LIST_HEAD(&opp_table->opp_list); |
f067a982 | 881 | kref_init(&opp_table->kref); |
07cce74a | 882 | |
2c2709dc | 883 | /* Secure the device table modification */ |
052c6f19 | 884 | list_add(&opp_table->node, &opp_tables); |
2c2709dc | 885 | return opp_table; |
07cce74a VK |
886 | } |
887 | ||
f067a982 | 888 | void _get_opp_table_kref(struct opp_table *opp_table) |
b6160e26 | 889 | { |
f067a982 VK |
890 | kref_get(&opp_table->kref); |
891 | } | |
892 | ||
eb7c8743 | 893 | static struct opp_table *_opp_get_opp_table(struct device *dev, int index) |
f067a982 VK |
894 | { |
895 | struct opp_table *opp_table; | |
896 | ||
897 | /* Hold our table modification lock here */ | |
898 | mutex_lock(&opp_table_lock); | |
899 | ||
5b650b38 VK |
900 | opp_table = _find_opp_table_unlocked(dev); |
901 | if (!IS_ERR(opp_table)) | |
f067a982 | 902 | goto unlock; |
f067a982 | 903 | |
283d55e6 VK |
904 | opp_table = _managed_opp(dev, index); |
905 | if (opp_table) { | |
906 | if (!_add_opp_dev_unlocked(dev, opp_table)) { | |
907 | dev_pm_opp_put_opp_table(opp_table); | |
908 | opp_table = NULL; | |
909 | } | |
910 | goto unlock; | |
911 | } | |
912 | ||
eb7c8743 | 913 | opp_table = _allocate_opp_table(dev, index); |
f067a982 VK |
914 | |
915 | unlock: | |
916 | mutex_unlock(&opp_table_lock); | |
917 | ||
918 | return opp_table; | |
919 | } | |
eb7c8743 VK |
920 | |
921 | struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) | |
922 | { | |
923 | return _opp_get_opp_table(dev, 0); | |
924 | } | |
f067a982 VK |
925 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); |
926 | ||
eb7c8743 VK |
927 | struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, |
928 | int index) | |
929 | { | |
930 | return _opp_get_opp_table(dev, index); | |
931 | } | |
932 | ||
b83c1899 | 933 | static void _opp_table_kref_release(struct kref *kref) |
f067a982 VK |
934 | { |
935 | struct opp_table *opp_table = container_of(kref, struct opp_table, kref); | |
cdd6ed90 | 936 | struct opp_device *opp_dev, *temp; |
b6160e26 | 937 | |
5d6d106f VK |
938 | _of_clear_opp_table(opp_table); |
939 | ||
b6160e26 VK |
940 | /* Release clk */ |
941 | if (!IS_ERR(opp_table->clk)) | |
942 | clk_put(opp_table->clk); | |
943 | ||
cdd6ed90 | 944 | WARN_ON(!list_empty(&opp_table->opp_list)); |
b6160e26 | 945 | |
cdd6ed90 VK |
946 | list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) { |
947 | /* | |
948 | * The OPP table is getting removed, drop the performance state | |
949 | * constraints. | |
950 | */ | |
951 | if (opp_table->genpd_performance_state) | |
952 | dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0); | |
b6160e26 | 953 | |
cdd6ed90 VK |
954 | _remove_opp_dev(opp_dev, opp_table); |
955 | } | |
b6160e26 | 956 | |
4f018bc0 | 957 | mutex_destroy(&opp_table->genpd_virt_dev_lock); |
37a73ec0 | 958 | mutex_destroy(&opp_table->lock); |
052c6f19 VK |
959 | list_del(&opp_table->node); |
960 | kfree(opp_table); | |
b6160e26 | 961 | |
f067a982 VK |
962 | mutex_unlock(&opp_table_lock); |
963 | } | |
964 | ||
d0e8ae6c VK |
965 | void _opp_remove_all_static(struct opp_table *opp_table) |
966 | { | |
967 | struct dev_pm_opp *opp, *tmp; | |
968 | ||
969 | list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { | |
970 | if (!opp->dynamic) | |
971 | dev_pm_opp_put(opp); | |
972 | } | |
973 | ||
974 | opp_table->parsed_static_opps = false; | |
975 | } | |
976 | ||
977 | static void _opp_table_list_kref_release(struct kref *kref) | |
978 | { | |
979 | struct opp_table *opp_table = container_of(kref, struct opp_table, | |
980 | list_kref); | |
981 | ||
982 | _opp_remove_all_static(opp_table); | |
983 | mutex_unlock(&opp_table_lock); | |
984 | } | |
985 | ||
986 | void _put_opp_list_kref(struct opp_table *opp_table) | |
987 | { | |
988 | kref_put_mutex(&opp_table->list_kref, _opp_table_list_kref_release, | |
989 | &opp_table_lock); | |
990 | } | |
991 | ||
f067a982 VK |
992 | void dev_pm_opp_put_opp_table(struct opp_table *opp_table) |
993 | { | |
994 | kref_put_mutex(&opp_table->kref, _opp_table_kref_release, | |
995 | &opp_table_lock); | |
996 | } | |
997 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table); | |
998 | ||
8cd2f6e8 | 999 | void _opp_free(struct dev_pm_opp *opp) |
969fceb3 VK |
1000 | { |
1001 | kfree(opp); | |
969fceb3 VK |
1002 | } |
1003 | ||
1690d8bb VK |
1004 | static void _opp_kref_release(struct dev_pm_opp *opp, |
1005 | struct opp_table *opp_table) | |
129eec55 VK |
1006 | { |
1007 | /* | |
1008 | * Notify the changes in the availability of the operable | |
1009 | * frequency/voltage list. | |
1010 | */ | |
052c6f19 | 1011 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); |
da544b61 | 1012 | _of_opp_free_required_opps(opp_table, opp); |
deaa5146 | 1013 | opp_debug_remove_one(opp); |
052c6f19 VK |
1014 | list_del(&opp->node); |
1015 | kfree(opp); | |
1690d8bb | 1016 | } |
129eec55 | 1017 | |
1690d8bb VK |
1018 | static void _opp_kref_release_unlocked(struct kref *kref) |
1019 | { | |
1020 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); | |
1021 | struct opp_table *opp_table = opp->opp_table; | |
1022 | ||
1023 | _opp_kref_release(opp, opp_table); | |
1024 | } | |
1025 | ||
1026 | static void _opp_kref_release_locked(struct kref *kref) | |
1027 | { | |
1028 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); | |
1029 | struct opp_table *opp_table = opp->opp_table; | |
1030 | ||
1031 | _opp_kref_release(opp, opp_table); | |
37a73ec0 | 1032 | mutex_unlock(&opp_table->lock); |
129eec55 VK |
1033 | } |
1034 | ||
a88bd2a5 | 1035 | void dev_pm_opp_get(struct dev_pm_opp *opp) |
8a31d9d9 VK |
1036 | { |
1037 | kref_get(&opp->kref); | |
1038 | } | |
1039 | ||
7034764a VK |
1040 | void dev_pm_opp_put(struct dev_pm_opp *opp) |
1041 | { | |
1690d8bb VK |
1042 | kref_put_mutex(&opp->kref, _opp_kref_release_locked, |
1043 | &opp->opp_table->lock); | |
7034764a VK |
1044 | } |
1045 | EXPORT_SYMBOL_GPL(dev_pm_opp_put); | |
1046 | ||
1690d8bb VK |
1047 | static void dev_pm_opp_put_unlocked(struct dev_pm_opp *opp) |
1048 | { | |
1049 | kref_put(&opp->kref, _opp_kref_release_unlocked); | |
1050 | } | |
1051 | ||
129eec55 | 1052 | /** |
2c2709dc | 1053 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
1054 | * @dev: device for which we do this operation |
1055 | * @freq: OPP to remove with matching 'freq' | |
1056 | * | |
2c2709dc | 1057 | * This function removes an opp from the opp table. |
129eec55 VK |
1058 | */ |
1059 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
1060 | { | |
1061 | struct dev_pm_opp *opp; | |
2c2709dc | 1062 | struct opp_table *opp_table; |
129eec55 VK |
1063 | bool found = false; |
1064 | ||
2c2709dc VK |
1065 | opp_table = _find_opp_table(dev); |
1066 | if (IS_ERR(opp_table)) | |
5b650b38 | 1067 | return; |
129eec55 | 1068 | |
37a73ec0 VK |
1069 | mutex_lock(&opp_table->lock); |
1070 | ||
2c2709dc | 1071 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
1072 | if (opp->rate == freq) { |
1073 | found = true; | |
1074 | break; | |
1075 | } | |
1076 | } | |
1077 | ||
37a73ec0 VK |
1078 | mutex_unlock(&opp_table->lock); |
1079 | ||
5b650b38 VK |
1080 | if (found) { |
1081 | dev_pm_opp_put(opp); | |
0ad8c623 VK |
1082 | |
1083 | /* Drop the reference taken by dev_pm_opp_add() */ | |
1084 | dev_pm_opp_put_opp_table(opp_table); | |
5b650b38 | 1085 | } else { |
129eec55 VK |
1086 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", |
1087 | __func__, freq); | |
129eec55 VK |
1088 | } |
1089 | ||
0ad8c623 | 1090 | /* Drop the reference taken by _find_opp_table() */ |
5b650b38 | 1091 | dev_pm_opp_put_opp_table(opp_table); |
129eec55 VK |
1092 | } |
1093 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
1094 | ||
1690d8bb VK |
1095 | /** |
1096 | * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs | |
1097 | * @dev: device for which we do this operation | |
1098 | * | |
1099 | * This function removes all dynamically created OPPs from the opp table. | |
1100 | */ | |
1101 | void dev_pm_opp_remove_all_dynamic(struct device *dev) | |
1102 | { | |
1103 | struct opp_table *opp_table; | |
1104 | struct dev_pm_opp *opp, *temp; | |
1105 | int count = 0; | |
1106 | ||
1107 | opp_table = _find_opp_table(dev); | |
1108 | if (IS_ERR(opp_table)) | |
1109 | return; | |
1110 | ||
1111 | mutex_lock(&opp_table->lock); | |
1112 | list_for_each_entry_safe(opp, temp, &opp_table->opp_list, node) { | |
1113 | if (opp->dynamic) { | |
1114 | dev_pm_opp_put_unlocked(opp); | |
1115 | count++; | |
1116 | } | |
1117 | } | |
1118 | mutex_unlock(&opp_table->lock); | |
1119 | ||
1120 | /* Drop the references taken by dev_pm_opp_add() */ | |
1121 | while (count--) | |
1122 | dev_pm_opp_put_opp_table(opp_table); | |
1123 | ||
1124 | /* Drop the reference taken by _find_opp_table() */ | |
1125 | dev_pm_opp_put_opp_table(opp_table); | |
1126 | } | |
1127 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic); | |
1128 | ||
8cd2f6e8 | 1129 | struct dev_pm_opp *_opp_allocate(struct opp_table *table) |
e1f60b29 | 1130 | { |
23dacf6d | 1131 | struct dev_pm_opp *opp; |
dfbe4678 | 1132 | int count, supply_size; |
e1f60b29 | 1133 | |
dfbe4678 | 1134 | /* Allocate space for at least one supply */ |
46f48aca | 1135 | count = table->regulator_count > 0 ? table->regulator_count : 1; |
dfbe4678 | 1136 | supply_size = sizeof(*opp->supplies) * count; |
e1f60b29 | 1137 | |
dfbe4678 VK |
1138 | /* allocate new OPP node and supplies structures */ |
1139 | opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL); | |
8cd2f6e8 | 1140 | if (!opp) |
23dacf6d | 1141 | return NULL; |
23dacf6d | 1142 | |
dfbe4678 VK |
1143 | /* Put the supplies at the end of the OPP structure as an empty array */ |
1144 | opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); | |
1145 | INIT_LIST_HEAD(&opp->node); | |
1146 | ||
23dacf6d VK |
1147 | return opp; |
1148 | } | |
1149 | ||
7d34d56e | 1150 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 1151 | struct opp_table *opp_table) |
7d34d56e | 1152 | { |
dfbe4678 VK |
1153 | struct regulator *reg; |
1154 | int i; | |
1155 | ||
90e3577b VK |
1156 | if (!opp_table->regulators) |
1157 | return true; | |
1158 | ||
dfbe4678 VK |
1159 | for (i = 0; i < opp_table->regulator_count; i++) { |
1160 | reg = opp_table->regulators[i]; | |
1161 | ||
1162 | if (!regulator_is_supported_voltage(reg, | |
1163 | opp->supplies[i].u_volt_min, | |
1164 | opp->supplies[i].u_volt_max)) { | |
1165 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
1166 | __func__, opp->supplies[i].u_volt_min, | |
1167 | opp->supplies[i].u_volt_max); | |
1168 | return false; | |
1169 | } | |
7d34d56e VK |
1170 | } |
1171 | ||
1172 | return true; | |
1173 | } | |
1174 | ||
a1e8c136 VK |
1175 | static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp, |
1176 | struct opp_table *opp_table, | |
1177 | struct list_head **head) | |
23dacf6d VK |
1178 | { |
1179 | struct dev_pm_opp *opp; | |
23dacf6d VK |
1180 | |
1181 | /* | |
1182 | * Insert new OPP in order of increasing frequency and discard if | |
1183 | * already present. | |
1184 | * | |
2c2709dc | 1185 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
1186 | * loop, don't replace it with head otherwise it will become an infinite |
1187 | * loop. | |
1188 | */ | |
052c6f19 | 1189 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
23dacf6d | 1190 | if (new_opp->rate > opp->rate) { |
a1e8c136 | 1191 | *head = &opp->node; |
23dacf6d VK |
1192 | continue; |
1193 | } | |
1194 | ||
1195 | if (new_opp->rate < opp->rate) | |
a1e8c136 | 1196 | return 0; |
23dacf6d VK |
1197 | |
1198 | /* Duplicate OPPs */ | |
06441658 | 1199 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
dfbe4678 VK |
1200 | __func__, opp->rate, opp->supplies[0].u_volt, |
1201 | opp->available, new_opp->rate, | |
1202 | new_opp->supplies[0].u_volt, new_opp->available); | |
23dacf6d | 1203 | |
dfbe4678 | 1204 | /* Should we compare voltages for all regulators here ? */ |
a1e8c136 VK |
1205 | return opp->available && |
1206 | new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST; | |
1207 | } | |
1208 | ||
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Returns: | |
1214 | * 0: On success. And appropriate error message for duplicate OPPs. | |
1215 | * -EBUSY: For OPP with same freq/volt and is available. The callers of | |
1216 | * _opp_add() must return 0 if they receive -EBUSY from it. This is to make | |
1217 | * sure we don't print error messages unnecessarily if different parts of | |
1218 | * kernel try to initialize the OPP table. | |
1219 | * -EEXIST: For OPP with same freq but different volt or is unavailable. This | |
1220 | * should be considered an error by the callers of _opp_add(). | |
1221 | */ | |
1222 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, | |
1223 | struct opp_table *opp_table, bool rate_not_available) | |
1224 | { | |
1225 | struct list_head *head; | |
1226 | int ret; | |
1227 | ||
1228 | mutex_lock(&opp_table->lock); | |
1229 | head = &opp_table->opp_list; | |
37a73ec0 | 1230 | |
a1e8c136 VK |
1231 | if (likely(!rate_not_available)) { |
1232 | ret = _opp_is_duplicate(dev, new_opp, opp_table, &head); | |
1233 | if (ret) { | |
1234 | mutex_unlock(&opp_table->lock); | |
1235 | return ret; | |
1236 | } | |
23dacf6d VK |
1237 | } |
1238 | ||
052c6f19 | 1239 | list_add(&new_opp->node, head); |
37a73ec0 VK |
1240 | mutex_unlock(&opp_table->lock); |
1241 | ||
1242 | new_opp->opp_table = opp_table; | |
7034764a | 1243 | kref_init(&new_opp->kref); |
23dacf6d | 1244 | |
a2dea4cb | 1245 | opp_debug_create_one(new_opp, opp_table); |
deaa5146 | 1246 | |
2c2709dc | 1247 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1248 | new_opp->available = false; |
1249 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1250 | __func__, new_opp->rate); | |
1251 | } | |
1252 | ||
23dacf6d VK |
1253 | return 0; |
1254 | } | |
1255 | ||
984f16c8 | 1256 | /** |
b64b9c3f | 1257 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
8cd2f6e8 | 1258 | * @opp_table: OPP table |
984f16c8 NM |
1259 | * @dev: device for which we do this operation |
1260 | * @freq: Frequency in Hz for this OPP | |
1261 | * @u_volt: Voltage in uVolts for this OPP | |
1262 | * @dynamic: Dynamically added OPPs. | |
1263 | * | |
2c2709dc | 1264 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1265 | * The opp is made available by default and it can be controlled using |
1266 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1267 | * | |
8f8d37b2 VK |
1268 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1269 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1270 | * |
984f16c8 NM |
1271 | * Return: |
1272 | * 0 On success OR | |
1273 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1274 | * -EEXIST Freq are same and volt are different OR | |
1275 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1276 | * -ENOMEM Memory allocation failure | |
1277 | */ | |
8cd2f6e8 VK |
1278 | int _opp_add_v1(struct opp_table *opp_table, struct device *dev, |
1279 | unsigned long freq, long u_volt, bool dynamic) | |
e1f60b29 | 1280 | { |
23dacf6d | 1281 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1282 | unsigned long tol; |
6ce4184d | 1283 | int ret; |
e1f60b29 | 1284 | |
8cd2f6e8 VK |
1285 | new_opp = _opp_allocate(opp_table); |
1286 | if (!new_opp) | |
1287 | return -ENOMEM; | |
23dacf6d | 1288 | |
a7470db6 | 1289 | /* populate the opp table */ |
a7470db6 | 1290 | new_opp->rate = freq; |
2c2709dc | 1291 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
dfbe4678 VK |
1292 | new_opp->supplies[0].u_volt = u_volt; |
1293 | new_opp->supplies[0].u_volt_min = u_volt - tol; | |
1294 | new_opp->supplies[0].u_volt_max = u_volt + tol; | |
a7470db6 | 1295 | new_opp->available = true; |
23dacf6d | 1296 | new_opp->dynamic = dynamic; |
a7470db6 | 1297 | |
a1e8c136 | 1298 | ret = _opp_add(dev, new_opp, opp_table, false); |
7f8538eb VK |
1299 | if (ret) { |
1300 | /* Don't return error for duplicate OPPs */ | |
1301 | if (ret == -EBUSY) | |
1302 | ret = 0; | |
6ce4184d | 1303 | goto free_opp; |
7f8538eb | 1304 | } |
64ce8545 | 1305 | |
03ca370f MH |
1306 | /* |
1307 | * Notify the changes in the availability of the operable | |
1308 | * frequency/voltage list. | |
1309 | */ | |
052c6f19 | 1310 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1311 | return 0; |
6ce4184d VK |
1312 | |
1313 | free_opp: | |
8cd2f6e8 VK |
1314 | _opp_free(new_opp); |
1315 | ||
6ce4184d | 1316 | return ret; |
e1f60b29 | 1317 | } |
38393409 | 1318 | |
7de36b0a VK |
1319 | /** |
1320 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1321 | * @dev: Device for which supported-hw has to be set. | |
1322 | * @versions: Array of hierarchy of versions to match. | |
1323 | * @count: Number of elements in the array. | |
1324 | * | |
1325 | * This is required only for the V2 bindings, and it enables a platform to | |
1326 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1327 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1328 | * property. | |
7de36b0a | 1329 | */ |
fa30184d VK |
1330 | struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, |
1331 | const u32 *versions, unsigned int count) | |
7de36b0a | 1332 | { |
2c2709dc | 1333 | struct opp_table *opp_table; |
7de36b0a | 1334 | |
fa30184d VK |
1335 | opp_table = dev_pm_opp_get_opp_table(dev); |
1336 | if (!opp_table) | |
1337 | return ERR_PTR(-ENOMEM); | |
7de36b0a | 1338 | |
2c2709dc VK |
1339 | /* Make sure there are no concurrent readers while updating opp_table */ |
1340 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1341 | |
25419de1 VK |
1342 | /* Another CPU that shares the OPP table has set the property ? */ |
1343 | if (opp_table->supported_hw) | |
1344 | return opp_table; | |
7de36b0a | 1345 | |
2c2709dc | 1346 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1347 | GFP_KERNEL); |
2c2709dc | 1348 | if (!opp_table->supported_hw) { |
25419de1 VK |
1349 | dev_pm_opp_put_opp_table(opp_table); |
1350 | return ERR_PTR(-ENOMEM); | |
7de36b0a VK |
1351 | } |
1352 | ||
2c2709dc | 1353 | opp_table->supported_hw_count = count; |
fa30184d VK |
1354 | |
1355 | return opp_table; | |
7de36b0a VK |
1356 | } |
1357 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1358 | ||
1359 | /** | |
1360 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
fa30184d | 1361 | * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw(). |
7de36b0a VK |
1362 | * |
1363 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1364 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a | 1365 | * will not be freed. |
7de36b0a | 1366 | */ |
fa30184d | 1367 | void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) |
7de36b0a | 1368 | { |
2c2709dc VK |
1369 | /* Make sure there are no concurrent readers while updating opp_table */ |
1370 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1371 | |
2c2709dc VK |
1372 | kfree(opp_table->supported_hw); |
1373 | opp_table->supported_hw = NULL; | |
1374 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1375 | |
fa30184d | 1376 | dev_pm_opp_put_opp_table(opp_table); |
7de36b0a VK |
1377 | } |
1378 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1379 | ||
01fb4d3c VK |
1380 | /** |
1381 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1382 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1383 | * @name: name to postfix to properties. |
1384 | * | |
1385 | * This is required only for the V2 bindings, and it enables a platform to | |
1386 | * specify the extn to be used for certain property names. The properties to | |
1387 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1388 | * should postfix the property name with -<name> while looking for them. | |
01fb4d3c | 1389 | */ |
fa30184d | 1390 | struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) |
01fb4d3c | 1391 | { |
2c2709dc | 1392 | struct opp_table *opp_table; |
01fb4d3c | 1393 | |
fa30184d VK |
1394 | opp_table = dev_pm_opp_get_opp_table(dev); |
1395 | if (!opp_table) | |
1396 | return ERR_PTR(-ENOMEM); | |
01fb4d3c | 1397 | |
2c2709dc VK |
1398 | /* Make sure there are no concurrent readers while updating opp_table */ |
1399 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1400 | |
878ec1a9 VK |
1401 | /* Another CPU that shares the OPP table has set the property ? */ |
1402 | if (opp_table->prop_name) | |
1403 | return opp_table; | |
01fb4d3c | 1404 | |
2c2709dc VK |
1405 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1406 | if (!opp_table->prop_name) { | |
878ec1a9 VK |
1407 | dev_pm_opp_put_opp_table(opp_table); |
1408 | return ERR_PTR(-ENOMEM); | |
01fb4d3c VK |
1409 | } |
1410 | ||
fa30184d | 1411 | return opp_table; |
01fb4d3c VK |
1412 | } |
1413 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1414 | ||
1415 | /** | |
1416 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
fa30184d | 1417 | * @opp_table: OPP table returned by dev_pm_opp_set_prop_name(). |
01fb4d3c VK |
1418 | * |
1419 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1420 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c | 1421 | * will not be freed. |
01fb4d3c | 1422 | */ |
fa30184d | 1423 | void dev_pm_opp_put_prop_name(struct opp_table *opp_table) |
01fb4d3c | 1424 | { |
2c2709dc VK |
1425 | /* Make sure there are no concurrent readers while updating opp_table */ |
1426 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1427 | |
2c2709dc VK |
1428 | kfree(opp_table->prop_name); |
1429 | opp_table->prop_name = NULL; | |
01fb4d3c | 1430 | |
fa30184d | 1431 | dev_pm_opp_put_opp_table(opp_table); |
01fb4d3c VK |
1432 | } |
1433 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1434 | ||
94735585 VK |
1435 | static int _allocate_set_opp_data(struct opp_table *opp_table) |
1436 | { | |
1437 | struct dev_pm_set_opp_data *data; | |
1438 | int len, count = opp_table->regulator_count; | |
1439 | ||
90e3577b | 1440 | if (WARN_ON(!opp_table->regulators)) |
94735585 VK |
1441 | return -EINVAL; |
1442 | ||
1443 | /* space for set_opp_data */ | |
1444 | len = sizeof(*data); | |
1445 | ||
1446 | /* space for old_opp.supplies and new_opp.supplies */ | |
1447 | len += 2 * sizeof(struct dev_pm_opp_supply) * count; | |
1448 | ||
1449 | data = kzalloc(len, GFP_KERNEL); | |
1450 | if (!data) | |
1451 | return -ENOMEM; | |
1452 | ||
1453 | data->old_opp.supplies = (void *)(data + 1); | |
1454 | data->new_opp.supplies = data->old_opp.supplies + count; | |
1455 | ||
1456 | opp_table->set_opp_data = data; | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | static void _free_set_opp_data(struct opp_table *opp_table) | |
1462 | { | |
1463 | kfree(opp_table->set_opp_data); | |
1464 | opp_table->set_opp_data = NULL; | |
1465 | } | |
1466 | ||
9f8ea969 | 1467 | /** |
dfbe4678 | 1468 | * dev_pm_opp_set_regulators() - Set regulator names for the device |
9f8ea969 | 1469 | * @dev: Device for which regulator name is being set. |
dfbe4678 VK |
1470 | * @names: Array of pointers to the names of the regulator. |
1471 | * @count: Number of regulators. | |
9f8ea969 VK |
1472 | * |
1473 | * In order to support OPP switching, OPP layer needs to know the name of the | |
dfbe4678 VK |
1474 | * device's regulators, as the core would be required to switch voltages as |
1475 | * well. | |
9f8ea969 VK |
1476 | * |
1477 | * This must be called before any OPPs are initialized for the device. | |
9f8ea969 | 1478 | */ |
dfbe4678 VK |
1479 | struct opp_table *dev_pm_opp_set_regulators(struct device *dev, |
1480 | const char * const names[], | |
1481 | unsigned int count) | |
9f8ea969 | 1482 | { |
2c2709dc | 1483 | struct opp_table *opp_table; |
9f8ea969 | 1484 | struct regulator *reg; |
dfbe4678 | 1485 | int ret, i; |
9f8ea969 | 1486 | |
fa30184d VK |
1487 | opp_table = dev_pm_opp_get_opp_table(dev); |
1488 | if (!opp_table) | |
1489 | return ERR_PTR(-ENOMEM); | |
9f8ea969 VK |
1490 | |
1491 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1492 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1493 | ret = -EBUSY; |
1494 | goto err; | |
1495 | } | |
1496 | ||
779b783c VK |
1497 | /* Another CPU that shares the OPP table has set the regulators ? */ |
1498 | if (opp_table->regulators) | |
1499 | return opp_table; | |
dfbe4678 VK |
1500 | |
1501 | opp_table->regulators = kmalloc_array(count, | |
1502 | sizeof(*opp_table->regulators), | |
1503 | GFP_KERNEL); | |
1504 | if (!opp_table->regulators) { | |
1505 | ret = -ENOMEM; | |
9f8ea969 VK |
1506 | goto err; |
1507 | } | |
1508 | ||
dfbe4678 VK |
1509 | for (i = 0; i < count; i++) { |
1510 | reg = regulator_get_optional(dev, names[i]); | |
1511 | if (IS_ERR(reg)) { | |
1512 | ret = PTR_ERR(reg); | |
1513 | if (ret != -EPROBE_DEFER) | |
1514 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
1515 | __func__, names[i], ret); | |
1516 | goto free_regulators; | |
1517 | } | |
1518 | ||
1519 | opp_table->regulators[i] = reg; | |
1520 | } | |
1521 | ||
1522 | opp_table->regulator_count = count; | |
9f8ea969 | 1523 | |
94735585 VK |
1524 | /* Allocate block only once to pass to set_opp() routines */ |
1525 | ret = _allocate_set_opp_data(opp_table); | |
1526 | if (ret) | |
1527 | goto free_regulators; | |
1528 | ||
91291d9a | 1529 | return opp_table; |
9f8ea969 | 1530 | |
dfbe4678 VK |
1531 | free_regulators: |
1532 | while (i != 0) | |
1533 | regulator_put(opp_table->regulators[--i]); | |
1534 | ||
1535 | kfree(opp_table->regulators); | |
1536 | opp_table->regulators = NULL; | |
46f48aca | 1537 | opp_table->regulator_count = -1; |
9f8ea969 | 1538 | err: |
fa30184d | 1539 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1540 | |
91291d9a | 1541 | return ERR_PTR(ret); |
9f8ea969 | 1542 | } |
dfbe4678 | 1543 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); |
9f8ea969 VK |
1544 | |
1545 | /** | |
dfbe4678 VK |
1546 | * dev_pm_opp_put_regulators() - Releases resources blocked for regulator |
1547 | * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). | |
9f8ea969 | 1548 | */ |
dfbe4678 | 1549 | void dev_pm_opp_put_regulators(struct opp_table *opp_table) |
9f8ea969 | 1550 | { |
dfbe4678 VK |
1551 | int i; |
1552 | ||
779b783c VK |
1553 | if (!opp_table->regulators) |
1554 | goto put_opp_table; | |
9f8ea969 | 1555 | |
2c2709dc VK |
1556 | /* Make sure there are no concurrent readers while updating opp_table */ |
1557 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
9f8ea969 | 1558 | |
dfbe4678 VK |
1559 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
1560 | regulator_put(opp_table->regulators[i]); | |
1561 | ||
94735585 VK |
1562 | _free_set_opp_data(opp_table); |
1563 | ||
dfbe4678 VK |
1564 | kfree(opp_table->regulators); |
1565 | opp_table->regulators = NULL; | |
46f48aca | 1566 | opp_table->regulator_count = -1; |
9f8ea969 | 1567 | |
779b783c | 1568 | put_opp_table: |
fa30184d | 1569 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1570 | } |
dfbe4678 | 1571 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); |
9f8ea969 | 1572 | |
829a4e8c VK |
1573 | /** |
1574 | * dev_pm_opp_set_clkname() - Set clk name for the device | |
1575 | * @dev: Device for which clk name is being set. | |
1576 | * @name: Clk name. | |
1577 | * | |
1578 | * In order to support OPP switching, OPP layer needs to get pointer to the | |
1579 | * clock for the device. Simple cases work fine without using this routine (i.e. | |
1580 | * by passing connection-id as NULL), but for a device with multiple clocks | |
1581 | * available, the OPP core needs to know the exact name of the clk to use. | |
1582 | * | |
1583 | * This must be called before any OPPs are initialized for the device. | |
1584 | */ | |
1585 | struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name) | |
1586 | { | |
1587 | struct opp_table *opp_table; | |
1588 | int ret; | |
1589 | ||
1590 | opp_table = dev_pm_opp_get_opp_table(dev); | |
1591 | if (!opp_table) | |
1592 | return ERR_PTR(-ENOMEM); | |
1593 | ||
1594 | /* This should be called before OPPs are initialized */ | |
1595 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
1596 | ret = -EBUSY; | |
1597 | goto err; | |
1598 | } | |
1599 | ||
1600 | /* Already have default clk set, free it */ | |
1601 | if (!IS_ERR(opp_table->clk)) | |
1602 | clk_put(opp_table->clk); | |
1603 | ||
1604 | /* Find clk for the device */ | |
1605 | opp_table->clk = clk_get(dev, name); | |
1606 | if (IS_ERR(opp_table->clk)) { | |
1607 | ret = PTR_ERR(opp_table->clk); | |
1608 | if (ret != -EPROBE_DEFER) { | |
1609 | dev_err(dev, "%s: Couldn't find clock: %d\n", __func__, | |
1610 | ret); | |
1611 | } | |
1612 | goto err; | |
1613 | } | |
1614 | ||
1615 | return opp_table; | |
1616 | ||
1617 | err: | |
1618 | dev_pm_opp_put_opp_table(opp_table); | |
1619 | ||
1620 | return ERR_PTR(ret); | |
1621 | } | |
1622 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname); | |
1623 | ||
1624 | /** | |
1625 | * dev_pm_opp_put_clkname() - Releases resources blocked for clk. | |
1626 | * @opp_table: OPP table returned from dev_pm_opp_set_clkname(). | |
1627 | */ | |
1628 | void dev_pm_opp_put_clkname(struct opp_table *opp_table) | |
1629 | { | |
1630 | /* Make sure there are no concurrent readers while updating opp_table */ | |
1631 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1632 | ||
1633 | clk_put(opp_table->clk); | |
1634 | opp_table->clk = ERR_PTR(-EINVAL); | |
1635 | ||
1636 | dev_pm_opp_put_opp_table(opp_table); | |
1637 | } | |
1638 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname); | |
1639 | ||
4dab160e VK |
1640 | /** |
1641 | * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
1642 | * @dev: Device for which the helper is getting registered. | |
1643 | * @set_opp: Custom set OPP helper. | |
1644 | * | |
1645 | * This is useful to support complex platforms (like platforms with multiple | |
1646 | * regulators per device), instead of the generic OPP set rate helper. | |
1647 | * | |
1648 | * This must be called before any OPPs are initialized for the device. | |
4dab160e | 1649 | */ |
fa30184d | 1650 | struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, |
4dab160e VK |
1651 | int (*set_opp)(struct dev_pm_set_opp_data *data)) |
1652 | { | |
1653 | struct opp_table *opp_table; | |
4dab160e VK |
1654 | |
1655 | if (!set_opp) | |
fa30184d | 1656 | return ERR_PTR(-EINVAL); |
4dab160e | 1657 | |
fa30184d VK |
1658 | opp_table = dev_pm_opp_get_opp_table(dev); |
1659 | if (!opp_table) | |
1660 | return ERR_PTR(-ENOMEM); | |
4dab160e VK |
1661 | |
1662 | /* This should be called before OPPs are initialized */ | |
1663 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
5019acc6 VK |
1664 | dev_pm_opp_put_opp_table(opp_table); |
1665 | return ERR_PTR(-EBUSY); | |
4dab160e VK |
1666 | } |
1667 | ||
5019acc6 VK |
1668 | /* Another CPU that shares the OPP table has set the helper ? */ |
1669 | if (!opp_table->set_opp) | |
1670 | opp_table->set_opp = set_opp; | |
4dab160e | 1671 | |
fa30184d | 1672 | return opp_table; |
4dab160e VK |
1673 | } |
1674 | EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); | |
1675 | ||
1676 | /** | |
604a7aeb | 1677 | * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for |
4dab160e | 1678 | * set_opp helper |
fa30184d | 1679 | * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper(). |
4dab160e | 1680 | * |
fa30184d | 1681 | * Release resources blocked for platform specific set_opp helper. |
4dab160e | 1682 | */ |
604a7aeb | 1683 | void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) |
4dab160e | 1684 | { |
4dab160e VK |
1685 | /* Make sure there are no concurrent readers while updating opp_table */ |
1686 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1687 | ||
1688 | opp_table->set_opp = NULL; | |
fa30184d | 1689 | dev_pm_opp_put_opp_table(opp_table); |
4dab160e | 1690 | } |
604a7aeb | 1691 | EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper); |
4dab160e | 1692 | |
4f018bc0 VK |
1693 | /** |
1694 | * dev_pm_opp_set_genpd_virt_dev - Set virtual genpd device for an index | |
1695 | * @dev: Consumer device for which the genpd device is getting set. | |
1696 | * @virt_dev: virtual genpd device. | |
1697 | * @index: index. | |
1698 | * | |
1699 | * Multiple generic power domains for a device are supported with the help of | |
1700 | * virtual genpd devices, which are created for each consumer device - genpd | |
1701 | * pair. These are the device structures which are attached to the power domain | |
1702 | * and are required by the OPP core to set the performance state of the genpd. | |
1703 | * | |
1704 | * This helper will normally be called by the consumer driver of the device | |
1705 | * "dev", as only that has details of the genpd devices. | |
1706 | * | |
1707 | * This helper needs to be called once for each of those virtual devices, but | |
1708 | * only if multiple domains are available for a device. Otherwise the original | |
1709 | * device structure will be used instead by the OPP core. | |
1710 | */ | |
1711 | struct opp_table *dev_pm_opp_set_genpd_virt_dev(struct device *dev, | |
1712 | struct device *virt_dev, | |
1713 | int index) | |
1714 | { | |
1715 | struct opp_table *opp_table; | |
1716 | ||
1717 | opp_table = dev_pm_opp_get_opp_table(dev); | |
1718 | if (!opp_table) | |
1719 | return ERR_PTR(-ENOMEM); | |
1720 | ||
1721 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
1722 | ||
1723 | if (unlikely(!opp_table->genpd_virt_devs || | |
1724 | index >= opp_table->required_opp_count || | |
1725 | opp_table->genpd_virt_devs[index])) { | |
1726 | ||
1727 | dev_err(dev, "Invalid request to set required device\n"); | |
1728 | dev_pm_opp_put_opp_table(opp_table); | |
1729 | mutex_unlock(&opp_table->genpd_virt_dev_lock); | |
1730 | ||
1731 | return ERR_PTR(-EINVAL); | |
1732 | } | |
1733 | ||
1734 | opp_table->genpd_virt_devs[index] = virt_dev; | |
1735 | mutex_unlock(&opp_table->genpd_virt_dev_lock); | |
1736 | ||
1737 | return opp_table; | |
1738 | } | |
1739 | ||
1740 | /** | |
1741 | * dev_pm_opp_put_genpd_virt_dev() - Releases resources blocked for genpd device. | |
1742 | * @opp_table: OPP table returned by dev_pm_opp_set_genpd_virt_dev(). | |
1743 | * @virt_dev: virtual genpd device. | |
1744 | * | |
1745 | * This releases the resource previously acquired with a call to | |
1746 | * dev_pm_opp_set_genpd_virt_dev(). The consumer driver shall call this helper | |
1747 | * if it doesn't want OPP core to update performance state of a power domain | |
1748 | * anymore. | |
1749 | */ | |
1750 | void dev_pm_opp_put_genpd_virt_dev(struct opp_table *opp_table, | |
1751 | struct device *virt_dev) | |
1752 | { | |
1753 | int i; | |
1754 | ||
1755 | /* | |
1756 | * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting | |
1757 | * used in parallel. | |
1758 | */ | |
1759 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
1760 | ||
1761 | for (i = 0; i < opp_table->required_opp_count; i++) { | |
1762 | if (opp_table->genpd_virt_devs[i] != virt_dev) | |
1763 | continue; | |
1764 | ||
1765 | opp_table->genpd_virt_devs[i] = NULL; | |
1766 | dev_pm_opp_put_opp_table(opp_table); | |
1767 | ||
1768 | /* Drop the vote */ | |
1769 | dev_pm_genpd_set_performance_state(virt_dev, 0); | |
1770 | break; | |
1771 | } | |
1772 | ||
1773 | mutex_unlock(&opp_table->genpd_virt_dev_lock); | |
1774 | ||
1775 | if (unlikely(i == opp_table->required_opp_count)) | |
1776 | dev_err(virt_dev, "Failed to find required device entry\n"); | |
1777 | } | |
1778 | ||
c8a59103 VK |
1779 | /** |
1780 | * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table. | |
1781 | * @src_table: OPP table which has dst_table as one of its required OPP table. | |
1782 | * @dst_table: Required OPP table of the src_table. | |
1783 | * @pstate: Current performance state of the src_table. | |
1784 | * | |
1785 | * This Returns pstate of the OPP (present in @dst_table) pointed out by the | |
1786 | * "required-opps" property of the OPP (present in @src_table) which has | |
1787 | * performance state set to @pstate. | |
1788 | * | |
1789 | * Return: Zero or positive performance state on success, otherwise negative | |
1790 | * value on errors. | |
1791 | */ | |
1792 | int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, | |
1793 | struct opp_table *dst_table, | |
1794 | unsigned int pstate) | |
1795 | { | |
1796 | struct dev_pm_opp *opp; | |
1797 | int dest_pstate = -EINVAL; | |
1798 | int i; | |
1799 | ||
1800 | if (!pstate) | |
1801 | return 0; | |
1802 | ||
1803 | /* | |
1804 | * Normally the src_table will have the "required_opps" property set to | |
1805 | * point to one of the OPPs in the dst_table, but in some cases the | |
1806 | * genpd and its master have one to one mapping of performance states | |
1807 | * and so none of them have the "required-opps" property set. Return the | |
1808 | * pstate of the src_table as it is in such cases. | |
1809 | */ | |
1810 | if (!src_table->required_opp_count) | |
1811 | return pstate; | |
1812 | ||
1813 | for (i = 0; i < src_table->required_opp_count; i++) { | |
1814 | if (src_table->required_opp_tables[i]->np == dst_table->np) | |
1815 | break; | |
1816 | } | |
1817 | ||
1818 | if (unlikely(i == src_table->required_opp_count)) { | |
1819 | pr_err("%s: Couldn't find matching OPP table (%p: %p)\n", | |
1820 | __func__, src_table, dst_table); | |
1821 | return -EINVAL; | |
1822 | } | |
1823 | ||
1824 | mutex_lock(&src_table->lock); | |
1825 | ||
1826 | list_for_each_entry(opp, &src_table->opp_list, node) { | |
1827 | if (opp->pstate == pstate) { | |
1828 | dest_pstate = opp->required_opps[i]->pstate; | |
1829 | goto unlock; | |
1830 | } | |
1831 | } | |
1832 | ||
1833 | pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table, | |
1834 | dst_table); | |
1835 | ||
1836 | unlock: | |
1837 | mutex_unlock(&src_table->lock); | |
1838 | ||
1839 | return dest_pstate; | |
1840 | } | |
1841 | ||
38393409 VK |
1842 | /** |
1843 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
1844 | * @dev: device for which we do this operation | |
1845 | * @freq: Frequency in Hz for this OPP | |
1846 | * @u_volt: Voltage in uVolts for this OPP | |
1847 | * | |
2c2709dc | 1848 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
1849 | * The opp is made available by default and it can be controlled using |
1850 | * dev_pm_opp_enable/disable functions. | |
1851 | * | |
38393409 | 1852 | * Return: |
984f16c8 | 1853 | * 0 On success OR |
38393409 | 1854 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 1855 | * -EEXIST Freq are same and volt are different OR |
38393409 | 1856 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 1857 | * -ENOMEM Memory allocation failure |
38393409 VK |
1858 | */ |
1859 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
1860 | { | |
8cd2f6e8 VK |
1861 | struct opp_table *opp_table; |
1862 | int ret; | |
1863 | ||
b83c1899 VK |
1864 | opp_table = dev_pm_opp_get_opp_table(dev); |
1865 | if (!opp_table) | |
1866 | return -ENOMEM; | |
8cd2f6e8 | 1867 | |
46f48aca VK |
1868 | /* Fix regulator count for dynamic OPPs */ |
1869 | opp_table->regulator_count = 1; | |
1870 | ||
8cd2f6e8 | 1871 | ret = _opp_add_v1(opp_table, dev, freq, u_volt, true); |
0ad8c623 VK |
1872 | if (ret) |
1873 | dev_pm_opp_put_opp_table(opp_table); | |
8cd2f6e8 | 1874 | |
8cd2f6e8 | 1875 | return ret; |
38393409 | 1876 | } |
5d4879cd | 1877 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
1878 | |
1879 | /** | |
327854c8 | 1880 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
1881 | * @dev: device for which we do this operation |
1882 | * @freq: OPP frequency to modify availability | |
1883 | * @availability_req: availability status requested for this opp | |
1884 | * | |
052c6f19 VK |
1885 | * Set the availability of an OPP, opp_{enable,disable} share a common logic |
1886 | * which is isolated here. | |
e1f60b29 | 1887 | * |
984f16c8 | 1888 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1889 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 | 1890 | * successful. |
e1f60b29 | 1891 | */ |
327854c8 NM |
1892 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
1893 | bool availability_req) | |
e1f60b29 | 1894 | { |
2c2709dc | 1895 | struct opp_table *opp_table; |
a7f3987e | 1896 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
1897 | int r = 0; |
1898 | ||
2c2709dc VK |
1899 | /* Find the opp_table */ |
1900 | opp_table = _find_opp_table(dev); | |
1901 | if (IS_ERR(opp_table)) { | |
1902 | r = PTR_ERR(opp_table); | |
e1f60b29 | 1903 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
a7f3987e | 1904 | return r; |
e1f60b29 NM |
1905 | } |
1906 | ||
37a73ec0 VK |
1907 | mutex_lock(&opp_table->lock); |
1908 | ||
e1f60b29 | 1909 | /* Do we have the frequency? */ |
2c2709dc | 1910 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
1911 | if (tmp_opp->rate == freq) { |
1912 | opp = tmp_opp; | |
1913 | break; | |
1914 | } | |
1915 | } | |
37a73ec0 | 1916 | |
e1f60b29 NM |
1917 | if (IS_ERR(opp)) { |
1918 | r = PTR_ERR(opp); | |
1919 | goto unlock; | |
1920 | } | |
1921 | ||
1922 | /* Is update really needed? */ | |
1923 | if (opp->available == availability_req) | |
1924 | goto unlock; | |
e1f60b29 | 1925 | |
a7f3987e | 1926 | opp->available = availability_req; |
e1f60b29 | 1927 | |
e4d8ae00 VK |
1928 | dev_pm_opp_get(opp); |
1929 | mutex_unlock(&opp_table->lock); | |
1930 | ||
03ca370f MH |
1931 | /* Notify the change of the OPP availability */ |
1932 | if (availability_req) | |
052c6f19 | 1933 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE, |
a7f3987e | 1934 | opp); |
03ca370f | 1935 | else |
052c6f19 | 1936 | blocking_notifier_call_chain(&opp_table->head, |
a7f3987e | 1937 | OPP_EVENT_DISABLE, opp); |
e1f60b29 | 1938 | |
e4d8ae00 VK |
1939 | dev_pm_opp_put(opp); |
1940 | goto put_table; | |
1941 | ||
e1f60b29 | 1942 | unlock: |
5b650b38 | 1943 | mutex_unlock(&opp_table->lock); |
e4d8ae00 | 1944 | put_table: |
5b650b38 | 1945 | dev_pm_opp_put_opp_table(opp_table); |
e1f60b29 NM |
1946 | return r; |
1947 | } | |
1948 | ||
1949 | /** | |
5d4879cd | 1950 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
1951 | * @dev: device for which we do this operation |
1952 | * @freq: OPP frequency to enable | |
1953 | * | |
1954 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
1955 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 1956 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 1957 | * |
984f16c8 | 1958 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1959 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1960 | * successful. |
e1f60b29 | 1961 | */ |
5d4879cd | 1962 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 1963 | { |
327854c8 | 1964 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 1965 | } |
5d4879cd | 1966 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
1967 | |
1968 | /** | |
5d4879cd | 1969 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
1970 | * @dev: device for which we do this operation |
1971 | * @freq: OPP frequency to disable | |
1972 | * | |
1973 | * Disables a provided opp. If the operation is valid, this returns | |
1974 | * 0, else the corresponding error value. It is meant to be a temporary | |
1975 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 1976 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 1977 | * |
984f16c8 | 1978 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1979 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1980 | * successful. |
e1f60b29 | 1981 | */ |
5d4879cd | 1982 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 1983 | { |
327854c8 | 1984 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 1985 | } |
5d4879cd | 1986 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 1987 | |
03ca370f | 1988 | /** |
dc2c9ad5 VK |
1989 | * dev_pm_opp_register_notifier() - Register OPP notifier for the device |
1990 | * @dev: Device for which notifier needs to be registered | |
1991 | * @nb: Notifier block to be registered | |
984f16c8 | 1992 | * |
dc2c9ad5 VK |
1993 | * Return: 0 on success or a negative error value. |
1994 | */ | |
1995 | int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) | |
1996 | { | |
1997 | struct opp_table *opp_table; | |
1998 | int ret; | |
1999 | ||
dc2c9ad5 | 2000 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2001 | if (IS_ERR(opp_table)) |
2002 | return PTR_ERR(opp_table); | |
2003 | ||
052c6f19 | 2004 | ret = blocking_notifier_chain_register(&opp_table->head, nb); |
dc2c9ad5 | 2005 | |
5b650b38 | 2006 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2007 | |
2008 | return ret; | |
2009 | } | |
2010 | EXPORT_SYMBOL(dev_pm_opp_register_notifier); | |
2011 | ||
2012 | /** | |
2013 | * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device | |
2014 | * @dev: Device for which notifier needs to be unregistered | |
2015 | * @nb: Notifier block to be unregistered | |
984f16c8 | 2016 | * |
dc2c9ad5 | 2017 | * Return: 0 on success or a negative error value. |
03ca370f | 2018 | */ |
dc2c9ad5 VK |
2019 | int dev_pm_opp_unregister_notifier(struct device *dev, |
2020 | struct notifier_block *nb) | |
03ca370f | 2021 | { |
dc2c9ad5 VK |
2022 | struct opp_table *opp_table; |
2023 | int ret; | |
03ca370f | 2024 | |
dc2c9ad5 | 2025 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2026 | if (IS_ERR(opp_table)) |
2027 | return PTR_ERR(opp_table); | |
dc2c9ad5 | 2028 | |
052c6f19 | 2029 | ret = blocking_notifier_chain_unregister(&opp_table->head, nb); |
03ca370f | 2030 | |
5b650b38 | 2031 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2032 | |
2033 | return ret; | |
03ca370f | 2034 | } |
dc2c9ad5 | 2035 | EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); |
b496dfbc | 2036 | |
2a4eb735 | 2037 | void _dev_pm_opp_find_and_remove_table(struct device *dev) |
9274c892 VK |
2038 | { |
2039 | struct opp_table *opp_table; | |
2040 | ||
2c2709dc VK |
2041 | /* Check for existing table for 'dev' */ |
2042 | opp_table = _find_opp_table(dev); | |
2043 | if (IS_ERR(opp_table)) { | |
2044 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
2045 | |
2046 | if (error != -ENODEV) | |
2c2709dc | 2047 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
2048 | IS_ERR_OR_NULL(dev) ? |
2049 | "Invalid device" : dev_name(dev), | |
2050 | error); | |
5b650b38 | 2051 | return; |
737002b5 VK |
2052 | } |
2053 | ||
cdd6ed90 VK |
2054 | _put_opp_list_kref(opp_table); |
2055 | ||
2056 | /* Drop reference taken by _find_opp_table() */ | |
2057 | dev_pm_opp_put_opp_table(opp_table); | |
737002b5 | 2058 | |
cdd6ed90 | 2059 | /* Drop reference taken while the OPP table was added */ |
5b650b38 | 2060 | dev_pm_opp_put_opp_table(opp_table); |
737002b5 | 2061 | } |
129eec55 VK |
2062 | |
2063 | /** | |
411466c5 | 2064 | * dev_pm_opp_remove_table() - Free all OPPs associated with the device |
2c2709dc | 2065 | * @dev: device pointer used to lookup OPP table. |
129eec55 | 2066 | * |
411466c5 SH |
2067 | * Free both OPPs created using static entries present in DT and the |
2068 | * dynamically added entries. | |
129eec55 | 2069 | */ |
411466c5 | 2070 | void dev_pm_opp_remove_table(struct device *dev) |
129eec55 | 2071 | { |
2a4eb735 | 2072 | _dev_pm_opp_find_and_remove_table(dev); |
8d4d4e98 | 2073 | } |
411466c5 | 2074 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |