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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e1f60b29 NM |
2 | /* |
3 | * Generic OPP Interface | |
4 | * | |
5 | * Copyright (C) 2009-2010 Texas Instruments Incorporated. | |
6 | * Nishanth Menon | |
7 | * Romit Dasgupta | |
8 | * Kevin Hilman | |
e1f60b29 NM |
9 | */ |
10 | ||
d6d2a528 VK |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
d54974c2 | 13 | #include <linux/clk.h> |
e1f60b29 NM |
14 | #include <linux/errno.h> |
15 | #include <linux/err.h> | |
e1f60b29 | 16 | #include <linux/slab.h> |
51990e82 | 17 | #include <linux/device.h> |
80126ce7 | 18 | #include <linux/export.h> |
009acd19 | 19 | #include <linux/pm_domain.h> |
9f8ea969 | 20 | #include <linux/regulator/consumer.h> |
e1f60b29 | 21 | |
f59d3ee8 | 22 | #include "opp.h" |
e1f60b29 NM |
23 | |
24 | /* | |
2c2709dc VK |
25 | * The root of the list of all opp-tables. All opp_table structures branch off |
26 | * from here, with each opp_table containing the list of opps it supports in | |
e1f60b29 NM |
27 | * various states of availability. |
28 | */ | |
f47b72a1 | 29 | LIST_HEAD(opp_tables); |
e1f60b29 | 30 | /* Lock to allow exclusive modification to the device and opp lists */ |
2c2709dc | 31 | DEFINE_MUTEX(opp_table_lock); |
e1f60b29 | 32 | |
2c2709dc VK |
33 | static struct opp_device *_find_opp_dev(const struct device *dev, |
34 | struct opp_table *opp_table) | |
06441658 | 35 | { |
2c2709dc | 36 | struct opp_device *opp_dev; |
06441658 | 37 | |
2c2709dc VK |
38 | list_for_each_entry(opp_dev, &opp_table->dev_list, node) |
39 | if (opp_dev->dev == dev) | |
40 | return opp_dev; | |
06441658 VK |
41 | |
42 | return NULL; | |
43 | } | |
44 | ||
6ac42397 | 45 | static struct opp_table *_find_opp_table_unlocked(struct device *dev) |
5b650b38 VK |
46 | { |
47 | struct opp_table *opp_table; | |
3d255699 | 48 | bool found; |
5b650b38 VK |
49 | |
50 | list_for_each_entry(opp_table, &opp_tables, node) { | |
3d255699 VK |
51 | mutex_lock(&opp_table->lock); |
52 | found = !!_find_opp_dev(dev, opp_table); | |
53 | mutex_unlock(&opp_table->lock); | |
54 | ||
55 | if (found) { | |
5b650b38 VK |
56 | _get_opp_table_kref(opp_table); |
57 | ||
58 | return opp_table; | |
59 | } | |
60 | } | |
61 | ||
62 | return ERR_PTR(-ENODEV); | |
63 | } | |
64 | ||
e1f60b29 | 65 | /** |
2c2709dc VK |
66 | * _find_opp_table() - find opp_table struct using device pointer |
67 | * @dev: device pointer used to lookup OPP table | |
e1f60b29 | 68 | * |
052c6f19 | 69 | * Search OPP table for one containing matching device. |
e1f60b29 | 70 | * |
2c2709dc | 71 | * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or |
e1f60b29 NM |
72 | * -EINVAL based on type of error. |
73 | * | |
5b650b38 | 74 | * The callers must call dev_pm_opp_put_opp_table() after the table is used. |
e1f60b29 | 75 | */ |
2c2709dc | 76 | struct opp_table *_find_opp_table(struct device *dev) |
e1f60b29 | 77 | { |
2c2709dc | 78 | struct opp_table *opp_table; |
e1f60b29 | 79 | |
50a3cb04 | 80 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
81 | pr_err("%s: Invalid parameters\n", __func__); |
82 | return ERR_PTR(-EINVAL); | |
83 | } | |
84 | ||
5b650b38 VK |
85 | mutex_lock(&opp_table_lock); |
86 | opp_table = _find_opp_table_unlocked(dev); | |
87 | mutex_unlock(&opp_table_lock); | |
e1f60b29 | 88 | |
5b650b38 | 89 | return opp_table; |
e1f60b29 NM |
90 | } |
91 | ||
92 | /** | |
d6d00742 | 93 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
94 | * @opp: opp for which voltage has to be returned for |
95 | * | |
984f16c8 | 96 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
97 | * return 0 |
98 | * | |
dfbe4678 | 99 | * This is useful only for devices with single power supply. |
e1f60b29 | 100 | */ |
47d43ba7 | 101 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 102 | { |
052c6f19 | 103 | if (IS_ERR_OR_NULL(opp)) { |
e1f60b29 | 104 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
105 | return 0; |
106 | } | |
e1f60b29 | 107 | |
052c6f19 | 108 | return opp->supplies[0].u_volt; |
e1f60b29 | 109 | } |
5d4879cd | 110 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
111 | |
112 | /** | |
5d4879cd | 113 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
114 | * @opp: opp for which frequency has to be returned for |
115 | * | |
984f16c8 | 116 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 | 117 | * return 0 |
e1f60b29 | 118 | */ |
47d43ba7 | 119 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 120 | { |
052c6f19 | 121 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
e1f60b29 | 122 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
123 | return 0; |
124 | } | |
e1f60b29 | 125 | |
052c6f19 | 126 | return opp->rate; |
e1f60b29 | 127 | } |
5d4879cd | 128 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 129 | |
5b93ac54 RN |
130 | /** |
131 | * dev_pm_opp_get_level() - Gets the level corresponding to an available opp | |
132 | * @opp: opp for which level value has to be returned for | |
133 | * | |
134 | * Return: level read from device tree corresponding to the opp, else | |
135 | * return 0. | |
136 | */ | |
137 | unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp) | |
138 | { | |
139 | if (IS_ERR_OR_NULL(opp) || !opp->available) { | |
140 | pr_err("%s: Invalid parameters\n", __func__); | |
141 | return 0; | |
142 | } | |
143 | ||
144 | return opp->level; | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_level); | |
147 | ||
19445b25 BZ |
148 | /** |
149 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
150 | * @opp: opp for which turbo mode is being verified | |
151 | * | |
152 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
153 | * conditions) for short duration of times to finish high throughput work | |
154 | * quickly. Running on them for longer times may overheat the chip. | |
155 | * | |
156 | * Return: true if opp is turbo opp, else false. | |
19445b25 BZ |
157 | */ |
158 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
159 | { | |
052c6f19 | 160 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
19445b25 BZ |
161 | pr_err("%s: Invalid parameters\n", __func__); |
162 | return false; | |
163 | } | |
164 | ||
052c6f19 | 165 | return opp->turbo; |
19445b25 BZ |
166 | } |
167 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
168 | ||
3ca9bb33 VK |
169 | /** |
170 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
171 | * @dev: device for which we do this operation | |
172 | * | |
173 | * Return: This function returns the max clock latency in nanoseconds. | |
3ca9bb33 VK |
174 | */ |
175 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
176 | { | |
2c2709dc | 177 | struct opp_table *opp_table; |
3ca9bb33 VK |
178 | unsigned long clock_latency_ns; |
179 | ||
2c2709dc VK |
180 | opp_table = _find_opp_table(dev); |
181 | if (IS_ERR(opp_table)) | |
5b650b38 VK |
182 | return 0; |
183 | ||
184 | clock_latency_ns = opp_table->clock_latency_ns_max; | |
185 | ||
186 | dev_pm_opp_put_opp_table(opp_table); | |
3ca9bb33 | 187 | |
3ca9bb33 VK |
188 | return clock_latency_ns; |
189 | } | |
190 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
191 | ||
655c9df9 VK |
192 | /** |
193 | * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds | |
194 | * @dev: device for which we do this operation | |
195 | * | |
196 | * Return: This function returns the max voltage latency in nanoseconds. | |
655c9df9 VK |
197 | */ |
198 | unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) | |
199 | { | |
2c2709dc | 200 | struct opp_table *opp_table; |
655c9df9 | 201 | struct dev_pm_opp *opp; |
478256bd | 202 | struct regulator *reg; |
655c9df9 | 203 | unsigned long latency_ns = 0; |
dfbe4678 VK |
204 | int ret, i, count; |
205 | struct { | |
206 | unsigned long min; | |
207 | unsigned long max; | |
208 | } *uV; | |
209 | ||
cdd3e614 VK |
210 | opp_table = _find_opp_table(dev); |
211 | if (IS_ERR(opp_table)) | |
212 | return 0; | |
213 | ||
dfbe4678 | 214 | /* Regulator may not be required for the device */ |
90e3577b | 215 | if (!opp_table->regulators) |
cdd3e614 | 216 | goto put_opp_table; |
dfbe4678 | 217 | |
90e3577b VK |
218 | count = opp_table->regulator_count; |
219 | ||
dfbe4678 VK |
220 | uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); |
221 | if (!uV) | |
478256bd | 222 | goto put_opp_table; |
655c9df9 | 223 | |
052c6f19 VK |
224 | mutex_lock(&opp_table->lock); |
225 | ||
dfbe4678 VK |
226 | for (i = 0; i < count; i++) { |
227 | uV[i].min = ~0; | |
228 | uV[i].max = 0; | |
655c9df9 | 229 | |
052c6f19 | 230 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
dfbe4678 VK |
231 | if (!opp->available) |
232 | continue; | |
233 | ||
234 | if (opp->supplies[i].u_volt_min < uV[i].min) | |
235 | uV[i].min = opp->supplies[i].u_volt_min; | |
236 | if (opp->supplies[i].u_volt_max > uV[i].max) | |
237 | uV[i].max = opp->supplies[i].u_volt_max; | |
238 | } | |
655c9df9 VK |
239 | } |
240 | ||
052c6f19 | 241 | mutex_unlock(&opp_table->lock); |
655c9df9 VK |
242 | |
243 | /* | |
2c2709dc | 244 | * The caller needs to ensure that opp_table (and hence the regulator) |
655c9df9 VK |
245 | * isn't freed, while we are executing this routine. |
246 | */ | |
8cc31116 | 247 | for (i = 0; i < count; i++) { |
478256bd | 248 | reg = opp_table->regulators[i]; |
dfbe4678 VK |
249 | ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); |
250 | if (ret > 0) | |
251 | latency_ns += ret * 1000; | |
252 | } | |
253 | ||
dfbe4678 | 254 | kfree(uV); |
cdd3e614 VK |
255 | put_opp_table: |
256 | dev_pm_opp_put_opp_table(opp_table); | |
655c9df9 VK |
257 | |
258 | return latency_ns; | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); | |
261 | ||
21743447 VK |
262 | /** |
263 | * dev_pm_opp_get_max_transition_latency() - Get max transition latency in | |
264 | * nanoseconds | |
265 | * @dev: device for which we do this operation | |
266 | * | |
267 | * Return: This function returns the max transition latency, in nanoseconds, to | |
268 | * switch from one OPP to other. | |
21743447 VK |
269 | */ |
270 | unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) | |
271 | { | |
272 | return dev_pm_opp_get_max_volt_latency(dev) + | |
273 | dev_pm_opp_get_max_clock_latency(dev); | |
274 | } | |
275 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); | |
276 | ||
4eafbd15 | 277 | /** |
3aa26a3b | 278 | * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz |
4eafbd15 BZ |
279 | * @dev: device for which we do this operation |
280 | * | |
3aa26a3b VK |
281 | * Return: This function returns the frequency of the OPP marked as suspend_opp |
282 | * if one is available, else returns 0; | |
4eafbd15 | 283 | */ |
3aa26a3b | 284 | unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev) |
4eafbd15 | 285 | { |
2c2709dc | 286 | struct opp_table *opp_table; |
3aa26a3b | 287 | unsigned long freq = 0; |
4eafbd15 | 288 | |
2c2709dc | 289 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
290 | if (IS_ERR(opp_table)) |
291 | return 0; | |
3aa26a3b | 292 | |
5b650b38 VK |
293 | if (opp_table->suspend_opp && opp_table->suspend_opp->available) |
294 | freq = dev_pm_opp_get_freq(opp_table->suspend_opp); | |
295 | ||
296 | dev_pm_opp_put_opp_table(opp_table); | |
4eafbd15 | 297 | |
3aa26a3b | 298 | return freq; |
4eafbd15 | 299 | } |
3aa26a3b | 300 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq); |
4eafbd15 | 301 | |
a1e8c136 VK |
302 | int _get_opp_count(struct opp_table *opp_table) |
303 | { | |
304 | struct dev_pm_opp *opp; | |
305 | int count = 0; | |
306 | ||
307 | mutex_lock(&opp_table->lock); | |
308 | ||
309 | list_for_each_entry(opp, &opp_table->opp_list, node) { | |
310 | if (opp->available) | |
311 | count++; | |
312 | } | |
313 | ||
314 | mutex_unlock(&opp_table->lock); | |
315 | ||
316 | return count; | |
317 | } | |
318 | ||
e1f60b29 | 319 | /** |
2c2709dc | 320 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table |
e1f60b29 NM |
321 | * @dev: device for which we do this operation |
322 | * | |
984f16c8 | 323 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 | 324 | * else returns 0 if none or the corresponding error value. |
e1f60b29 | 325 | */ |
5d4879cd | 326 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 | 327 | { |
2c2709dc | 328 | struct opp_table *opp_table; |
a1e8c136 | 329 | int count; |
e1f60b29 | 330 | |
2c2709dc VK |
331 | opp_table = _find_opp_table(dev); |
332 | if (IS_ERR(opp_table)) { | |
333 | count = PTR_ERR(opp_table); | |
035ed072 | 334 | dev_dbg(dev, "%s: OPP table not found (%d)\n", |
b4718c02 | 335 | __func__, count); |
09f662f9 | 336 | return count; |
e1f60b29 NM |
337 | } |
338 | ||
a1e8c136 | 339 | count = _get_opp_count(opp_table); |
5b650b38 VK |
340 | dev_pm_opp_put_opp_table(opp_table); |
341 | ||
e1f60b29 NM |
342 | return count; |
343 | } | |
5d4879cd | 344 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
345 | |
346 | /** | |
5d4879cd | 347 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
348 | * @dev: device for which we do this operation |
349 | * @freq: frequency to search for | |
7ae49618 | 350 | * @available: true/false - match for available opp |
e1f60b29 | 351 | * |
2c2709dc | 352 | * Return: Searches for exact match in the opp table and returns pointer to the |
984f16c8 NM |
353 | * matching opp if found, else returns ERR_PTR in case of error and should |
354 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
355 | * EINVAL: for bad pointer |
356 | * ERANGE: no match found for search | |
357 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
358 | * |
359 | * Note: available is a modifier for the search. if available=true, then the | |
360 | * match is for exact matching frequency and is available in the stored OPP | |
361 | * table. if false, the match is for exact frequency which is not available. | |
362 | * | |
363 | * This provides a mechanism to enable an opp which is not available currently | |
364 | * or the opposite as well. | |
365 | * | |
8a31d9d9 VK |
366 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
367 | * use. | |
e1f60b29 | 368 | */ |
47d43ba7 NM |
369 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
370 | unsigned long freq, | |
371 | bool available) | |
e1f60b29 | 372 | { |
2c2709dc | 373 | struct opp_table *opp_table; |
47d43ba7 | 374 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 375 | |
2c2709dc VK |
376 | opp_table = _find_opp_table(dev); |
377 | if (IS_ERR(opp_table)) { | |
378 | int r = PTR_ERR(opp_table); | |
379 | ||
380 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
e1f60b29 NM |
381 | return ERR_PTR(r); |
382 | } | |
383 | ||
052c6f19 | 384 | mutex_lock(&opp_table->lock); |
5b650b38 | 385 | |
052c6f19 | 386 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
387 | if (temp_opp->available == available && |
388 | temp_opp->rate == freq) { | |
389 | opp = temp_opp; | |
8a31d9d9 VK |
390 | |
391 | /* Increment the reference count of OPP */ | |
392 | dev_pm_opp_get(opp); | |
e1f60b29 NM |
393 | break; |
394 | } | |
395 | } | |
396 | ||
052c6f19 | 397 | mutex_unlock(&opp_table->lock); |
5b650b38 | 398 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 399 | |
e1f60b29 NM |
400 | return opp; |
401 | } | |
5d4879cd | 402 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 | 403 | |
71419d84 NC |
404 | /** |
405 | * dev_pm_opp_find_level_exact() - search for an exact level | |
406 | * @dev: device for which we do this operation | |
407 | * @level: level to search for | |
408 | * | |
409 | * Return: Searches for exact match in the opp table and returns pointer to the | |
410 | * matching opp if found, else returns ERR_PTR in case of error and should | |
411 | * be handled using IS_ERR. Error return values can be: | |
412 | * EINVAL: for bad pointer | |
413 | * ERANGE: no match found for search | |
414 | * ENODEV: if device not found in list of registered devices | |
415 | * | |
416 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
417 | * use. | |
418 | */ | |
419 | struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev, | |
420 | unsigned int level) | |
421 | { | |
422 | struct opp_table *opp_table; | |
423 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
424 | ||
425 | opp_table = _find_opp_table(dev); | |
426 | if (IS_ERR(opp_table)) { | |
427 | int r = PTR_ERR(opp_table); | |
428 | ||
429 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
430 | return ERR_PTR(r); | |
431 | } | |
432 | ||
433 | mutex_lock(&opp_table->lock); | |
434 | ||
435 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
436 | if (temp_opp->level == level) { | |
437 | opp = temp_opp; | |
438 | ||
439 | /* Increment the reference count of OPP */ | |
440 | dev_pm_opp_get(opp); | |
441 | break; | |
442 | } | |
443 | } | |
444 | ||
445 | mutex_unlock(&opp_table->lock); | |
446 | dev_pm_opp_put_opp_table(opp_table); | |
447 | ||
448 | return opp; | |
449 | } | |
450 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact); | |
451 | ||
067b7ce0 JZ |
452 | static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, |
453 | unsigned long *freq) | |
454 | { | |
455 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
456 | ||
052c6f19 VK |
457 | mutex_lock(&opp_table->lock); |
458 | ||
459 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
067b7ce0 JZ |
460 | if (temp_opp->available && temp_opp->rate >= *freq) { |
461 | opp = temp_opp; | |
462 | *freq = opp->rate; | |
8a31d9d9 VK |
463 | |
464 | /* Increment the reference count of OPP */ | |
465 | dev_pm_opp_get(opp); | |
067b7ce0 JZ |
466 | break; |
467 | } | |
468 | } | |
469 | ||
052c6f19 VK |
470 | mutex_unlock(&opp_table->lock); |
471 | ||
067b7ce0 JZ |
472 | return opp; |
473 | } | |
474 | ||
e1f60b29 | 475 | /** |
5d4879cd | 476 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
477 | * @dev: device for which we do this operation |
478 | * @freq: Start frequency | |
479 | * | |
480 | * Search for the matching ceil *available* OPP from a starting freq | |
481 | * for a device. | |
482 | * | |
984f16c8 | 483 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
484 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
485 | * values can be: | |
486 | * EINVAL: for bad pointer | |
487 | * ERANGE: no match found for search | |
488 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 489 | * |
8a31d9d9 VK |
490 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
491 | * use. | |
e1f60b29 | 492 | */ |
47d43ba7 NM |
493 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
494 | unsigned long *freq) | |
e1f60b29 | 495 | { |
2c2709dc | 496 | struct opp_table *opp_table; |
8a31d9d9 | 497 | struct dev_pm_opp *opp; |
b02ded24 | 498 | |
e1f60b29 NM |
499 | if (!dev || !freq) { |
500 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
501 | return ERR_PTR(-EINVAL); | |
502 | } | |
503 | ||
2c2709dc | 504 | opp_table = _find_opp_table(dev); |
5b650b38 | 505 | if (IS_ERR(opp_table)) |
2c2709dc | 506 | return ERR_CAST(opp_table); |
5b650b38 | 507 | |
8a31d9d9 | 508 | opp = _find_freq_ceil(opp_table, freq); |
e1f60b29 | 509 | |
5b650b38 | 510 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 VK |
511 | |
512 | return opp; | |
e1f60b29 | 513 | } |
5d4879cd | 514 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
515 | |
516 | /** | |
5d4879cd | 517 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
518 | * @dev: device for which we do this operation |
519 | * @freq: Start frequency | |
520 | * | |
521 | * Search for the matching floor *available* OPP from a starting freq | |
522 | * for a device. | |
523 | * | |
984f16c8 | 524 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
525 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
526 | * values can be: | |
527 | * EINVAL: for bad pointer | |
528 | * ERANGE: no match found for search | |
529 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 530 | * |
8a31d9d9 VK |
531 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
532 | * use. | |
e1f60b29 | 533 | */ |
47d43ba7 NM |
534 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
535 | unsigned long *freq) | |
e1f60b29 | 536 | { |
2c2709dc | 537 | struct opp_table *opp_table; |
47d43ba7 | 538 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 NM |
539 | |
540 | if (!dev || !freq) { | |
541 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
542 | return ERR_PTR(-EINVAL); | |
543 | } | |
544 | ||
2c2709dc | 545 | opp_table = _find_opp_table(dev); |
5b650b38 | 546 | if (IS_ERR(opp_table)) |
2c2709dc | 547 | return ERR_CAST(opp_table); |
5b650b38 | 548 | |
052c6f19 | 549 | mutex_lock(&opp_table->lock); |
e1f60b29 | 550 | |
052c6f19 | 551 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
552 | if (temp_opp->available) { |
553 | /* go to the next node, before choosing prev */ | |
554 | if (temp_opp->rate > *freq) | |
555 | break; | |
556 | else | |
557 | opp = temp_opp; | |
558 | } | |
559 | } | |
8a31d9d9 VK |
560 | |
561 | /* Increment the reference count of OPP */ | |
562 | if (!IS_ERR(opp)) | |
563 | dev_pm_opp_get(opp); | |
052c6f19 | 564 | mutex_unlock(&opp_table->lock); |
5b650b38 | 565 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 566 | |
e1f60b29 NM |
567 | if (!IS_ERR(opp)) |
568 | *freq = opp->rate; | |
569 | ||
570 | return opp; | |
571 | } | |
5d4879cd | 572 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 573 | |
2f36bde0 AC |
574 | /** |
575 | * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for | |
576 | * target voltage. | |
577 | * @dev: Device for which we do this operation. | |
578 | * @u_volt: Target voltage. | |
579 | * | |
580 | * Search for OPP with highest (ceil) frequency and has voltage <= u_volt. | |
581 | * | |
582 | * Return: matching *opp, else returns ERR_PTR in case of error which should be | |
583 | * handled using IS_ERR. | |
584 | * | |
585 | * Error return values can be: | |
586 | * EINVAL: bad parameters | |
587 | * | |
588 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
589 | * use. | |
590 | */ | |
591 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev, | |
592 | unsigned long u_volt) | |
593 | { | |
594 | struct opp_table *opp_table; | |
595 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
596 | ||
597 | if (!dev || !u_volt) { | |
598 | dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__, | |
599 | u_volt); | |
600 | return ERR_PTR(-EINVAL); | |
601 | } | |
602 | ||
603 | opp_table = _find_opp_table(dev); | |
604 | if (IS_ERR(opp_table)) | |
605 | return ERR_CAST(opp_table); | |
606 | ||
607 | mutex_lock(&opp_table->lock); | |
608 | ||
609 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
610 | if (temp_opp->available) { | |
611 | if (temp_opp->supplies[0].u_volt > u_volt) | |
612 | break; | |
613 | opp = temp_opp; | |
614 | } | |
615 | } | |
616 | ||
617 | /* Increment the reference count of OPP */ | |
618 | if (!IS_ERR(opp)) | |
619 | dev_pm_opp_get(opp); | |
620 | ||
621 | mutex_unlock(&opp_table->lock); | |
622 | dev_pm_opp_put_opp_table(opp_table); | |
623 | ||
624 | return opp; | |
625 | } | |
626 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt); | |
627 | ||
6a0712f6 | 628 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, |
ce31781a | 629 | struct dev_pm_opp_supply *supply) |
6a0712f6 VK |
630 | { |
631 | int ret; | |
632 | ||
633 | /* Regulator not available for device */ | |
634 | if (IS_ERR(reg)) { | |
635 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
636 | PTR_ERR(reg)); | |
637 | return 0; | |
638 | } | |
639 | ||
ce31781a VK |
640 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, |
641 | supply->u_volt_min, supply->u_volt, supply->u_volt_max); | |
6a0712f6 | 642 | |
ce31781a VK |
643 | ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, |
644 | supply->u_volt, supply->u_volt_max); | |
6a0712f6 VK |
645 | if (ret) |
646 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
ce31781a VK |
647 | __func__, supply->u_volt_min, supply->u_volt, |
648 | supply->u_volt_max, ret); | |
6a0712f6 VK |
649 | |
650 | return ret; | |
651 | } | |
652 | ||
285881b5 VK |
653 | static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk, |
654 | unsigned long freq) | |
94735585 VK |
655 | { |
656 | int ret; | |
657 | ||
658 | ret = clk_set_rate(clk, freq); | |
659 | if (ret) { | |
660 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
661 | ret); | |
662 | } | |
663 | ||
664 | return ret; | |
665 | } | |
666 | ||
8d45719c | 667 | static int _generic_set_opp_regulator(struct opp_table *opp_table, |
c74b32fa VK |
668 | struct device *dev, |
669 | unsigned long old_freq, | |
670 | unsigned long freq, | |
671 | struct dev_pm_opp_supply *old_supply, | |
672 | struct dev_pm_opp_supply *new_supply) | |
94735585 | 673 | { |
c74b32fa | 674 | struct regulator *reg = opp_table->regulators[0]; |
94735585 VK |
675 | int ret; |
676 | ||
677 | /* This function only supports single regulator per device */ | |
c74b32fa | 678 | if (WARN_ON(opp_table->regulator_count > 1)) { |
94735585 VK |
679 | dev_err(dev, "multiple regulators are not supported\n"); |
680 | return -EINVAL; | |
681 | } | |
682 | ||
683 | /* Scaling up? Scale voltage before frequency */ | |
c5c2a97b | 684 | if (freq >= old_freq) { |
94735585 VK |
685 | ret = _set_opp_voltage(dev, reg, new_supply); |
686 | if (ret) | |
687 | goto restore_voltage; | |
688 | } | |
689 | ||
690 | /* Change frequency */ | |
285881b5 | 691 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq); |
94735585 VK |
692 | if (ret) |
693 | goto restore_voltage; | |
694 | ||
695 | /* Scaling down? Scale voltage after frequency */ | |
696 | if (freq < old_freq) { | |
697 | ret = _set_opp_voltage(dev, reg, new_supply); | |
698 | if (ret) | |
699 | goto restore_freq; | |
700 | } | |
701 | ||
8d45719c KK |
702 | /* |
703 | * Enable the regulator after setting its voltages, otherwise it breaks | |
704 | * some boot-enabled regulators. | |
705 | */ | |
706 | if (unlikely(!opp_table->regulator_enabled)) { | |
707 | ret = regulator_enable(reg); | |
708 | if (ret < 0) | |
709 | dev_warn(dev, "Failed to enable regulator: %d", ret); | |
710 | else | |
711 | opp_table->regulator_enabled = true; | |
712 | } | |
713 | ||
94735585 VK |
714 | return 0; |
715 | ||
716 | restore_freq: | |
285881b5 | 717 | if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq)) |
94735585 VK |
718 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
719 | __func__, old_freq); | |
720 | restore_voltage: | |
721 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
c74b32fa | 722 | if (old_supply) |
94735585 VK |
723 | _set_opp_voltage(dev, reg, old_supply); |
724 | ||
725 | return ret; | |
726 | } | |
727 | ||
7e535993 VK |
728 | static int _set_opp_custom(const struct opp_table *opp_table, |
729 | struct device *dev, unsigned long old_freq, | |
730 | unsigned long freq, | |
731 | struct dev_pm_opp_supply *old_supply, | |
732 | struct dev_pm_opp_supply *new_supply) | |
733 | { | |
734 | struct dev_pm_set_opp_data *data; | |
735 | int size; | |
736 | ||
737 | data = opp_table->set_opp_data; | |
738 | data->regulators = opp_table->regulators; | |
739 | data->regulator_count = opp_table->regulator_count; | |
740 | data->clk = opp_table->clk; | |
741 | data->dev = dev; | |
742 | ||
743 | data->old_opp.rate = old_freq; | |
744 | size = sizeof(*old_supply) * opp_table->regulator_count; | |
560d1bca | 745 | if (!old_supply) |
7e535993 VK |
746 | memset(data->old_opp.supplies, 0, size); |
747 | else | |
748 | memcpy(data->old_opp.supplies, old_supply, size); | |
749 | ||
750 | data->new_opp.rate = freq; | |
751 | memcpy(data->new_opp.supplies, new_supply, size); | |
752 | ||
753 | return opp_table->set_opp(data); | |
754 | } | |
755 | ||
ca1b5d77 VK |
756 | /* This is only called for PM domain for now */ |
757 | static int _set_required_opps(struct device *dev, | |
758 | struct opp_table *opp_table, | |
759 | struct dev_pm_opp *opp) | |
760 | { | |
761 | struct opp_table **required_opp_tables = opp_table->required_opp_tables; | |
762 | struct device **genpd_virt_devs = opp_table->genpd_virt_devs; | |
763 | unsigned int pstate; | |
764 | int i, ret = 0; | |
765 | ||
766 | if (!required_opp_tables) | |
767 | return 0; | |
768 | ||
769 | /* Single genpd case */ | |
770 | if (!genpd_virt_devs) { | |
cd7ea582 | 771 | pstate = likely(opp) ? opp->required_opps[0]->pstate : 0; |
ca1b5d77 VK |
772 | ret = dev_pm_genpd_set_performance_state(dev, pstate); |
773 | if (ret) { | |
774 | dev_err(dev, "Failed to set performance state of %s: %d (%d)\n", | |
775 | dev_name(dev), pstate, ret); | |
776 | } | |
777 | return ret; | |
778 | } | |
779 | ||
780 | /* Multiple genpd case */ | |
781 | ||
782 | /* | |
783 | * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev | |
784 | * after it is freed from another thread. | |
785 | */ | |
786 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
787 | ||
788 | for (i = 0; i < opp_table->required_opp_count; i++) { | |
cd7ea582 | 789 | pstate = likely(opp) ? opp->required_opps[i]->pstate : 0; |
ca1b5d77 VK |
790 | |
791 | if (!genpd_virt_devs[i]) | |
792 | continue; | |
793 | ||
794 | ret = dev_pm_genpd_set_performance_state(genpd_virt_devs[i], pstate); | |
795 | if (ret) { | |
796 | dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n", | |
797 | dev_name(genpd_virt_devs[i]), pstate, ret); | |
798 | break; | |
799 | } | |
800 | } | |
801 | mutex_unlock(&opp_table->genpd_virt_dev_lock); | |
802 | ||
803 | return ret; | |
804 | } | |
805 | ||
6a0712f6 VK |
806 | /** |
807 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
808 | * @dev: device for which we do this operation | |
809 | * @target_freq: frequency to achieve | |
810 | * | |
b3e3759e SB |
811 | * This configures the power-supplies to the levels specified by the OPP |
812 | * corresponding to the target_freq, and programs the clock to a value <= | |
813 | * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax | |
814 | * provided by the opp, should have already rounded to the target OPP's | |
815 | * frequency. | |
6a0712f6 VK |
816 | */ |
817 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
818 | { | |
2c2709dc | 819 | struct opp_table *opp_table; |
b3e3759e | 820 | unsigned long freq, old_freq, temp_freq; |
6a0712f6 | 821 | struct dev_pm_opp *old_opp, *opp; |
6a0712f6 | 822 | struct clk *clk; |
fe2af402 | 823 | int ret, i; |
6a0712f6 | 824 | |
052c6f19 VK |
825 | opp_table = _find_opp_table(dev); |
826 | if (IS_ERR(opp_table)) { | |
827 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); | |
828 | return PTR_ERR(opp_table); | |
829 | } | |
830 | ||
cd7ea582 | 831 | if (unlikely(!target_freq)) { |
b23dfa35 VK |
832 | /* |
833 | * Some drivers need to support cases where some platforms may | |
834 | * have OPP table for the device, while others don't and | |
835 | * opp_set_rate() just needs to behave like clk_set_rate(). | |
836 | */ | |
837 | if (!_get_opp_count(opp_table)) | |
aca48b61 | 838 | return 0; |
b23dfa35 | 839 | |
8d45719c | 840 | if (!opp_table->required_opp_tables && !opp_table->regulators) { |
cd7ea582 RN |
841 | dev_err(dev, "target frequency can't be 0\n"); |
842 | ret = -EINVAL; | |
b23dfa35 | 843 | goto put_opp_table; |
cd7ea582 RN |
844 | } |
845 | ||
8d45719c KK |
846 | if (opp_table->regulator_enabled) { |
847 | regulator_disable(opp_table->regulators[0]); | |
848 | opp_table->regulator_enabled = false; | |
849 | } | |
850 | ||
b23dfa35 | 851 | ret = _set_required_opps(dev, opp_table, NULL); |
cd7ea582 RN |
852 | goto put_opp_table; |
853 | } | |
854 | ||
052c6f19 VK |
855 | clk = opp_table->clk; |
856 | if (IS_ERR(clk)) { | |
857 | dev_err(dev, "%s: No clock available for the device\n", | |
858 | __func__); | |
859 | ret = PTR_ERR(clk); | |
860 | goto put_opp_table; | |
861 | } | |
6a0712f6 VK |
862 | |
863 | freq = clk_round_rate(clk, target_freq); | |
864 | if ((long)freq <= 0) | |
865 | freq = target_freq; | |
866 | ||
867 | old_freq = clk_get_rate(clk); | |
868 | ||
869 | /* Return early if nothing to do */ | |
870 | if (old_freq == freq) { | |
871 | dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", | |
872 | __func__, freq); | |
052c6f19 VK |
873 | ret = 0; |
874 | goto put_opp_table; | |
6a0712f6 VK |
875 | } |
876 | ||
aca48b61 RN |
877 | /* |
878 | * For IO devices which require an OPP on some platforms/SoCs | |
879 | * while just needing to scale the clock on some others | |
880 | * we look for empty OPP tables with just a clock handle and | |
881 | * scale only the clk. This makes dev_pm_opp_set_rate() | |
882 | * equivalent to a clk_set_rate() | |
883 | */ | |
884 | if (!_get_opp_count(opp_table)) { | |
885 | ret = _generic_set_opp_clk_only(dev, clk, freq); | |
886 | goto put_opp_table; | |
887 | } | |
888 | ||
b3e3759e SB |
889 | temp_freq = old_freq; |
890 | old_opp = _find_freq_ceil(opp_table, &temp_freq); | |
4df27c91 | 891 | if (IS_ERR(old_opp)) { |
6a0712f6 VK |
892 | dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", |
893 | __func__, old_freq, PTR_ERR(old_opp)); | |
894 | } | |
895 | ||
b3e3759e SB |
896 | temp_freq = freq; |
897 | opp = _find_freq_ceil(opp_table, &temp_freq); | |
6a0712f6 VK |
898 | if (IS_ERR(opp)) { |
899 | ret = PTR_ERR(opp); | |
900 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
901 | __func__, freq, ret); | |
052c6f19 | 902 | goto put_old_opp; |
6a0712f6 VK |
903 | } |
904 | ||
94735585 VK |
905 | dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, |
906 | old_freq, freq); | |
dfbe4678 | 907 | |
ca1b5d77 | 908 | /* Scaling up? Configure required OPPs before frequency */ |
faef080f | 909 | if (freq >= old_freq) { |
ca1b5d77 VK |
910 | ret = _set_required_opps(dev, opp_table, opp); |
911 | if (ret) | |
912 | goto put_opp; | |
913 | } | |
914 | ||
7e535993 VK |
915 | if (opp_table->set_opp) { |
916 | ret = _set_opp_custom(opp_table, dev, old_freq, freq, | |
917 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
918 | opp->supplies); | |
919 | } else if (opp_table->regulators) { | |
c74b32fa VK |
920 | ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq, |
921 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
922 | opp->supplies); | |
923 | } else { | |
7e535993 | 924 | /* Only frequency scaling */ |
285881b5 | 925 | ret = _generic_set_opp_clk_only(dev, clk, freq); |
ca1b5d77 | 926 | } |
c74b32fa | 927 | |
ca1b5d77 VK |
928 | /* Scaling down? Configure required OPPs after frequency */ |
929 | if (!ret && freq < old_freq) { | |
930 | ret = _set_required_opps(dev, opp_table, opp); | |
931 | if (ret) | |
932 | dev_err(dev, "Failed to set required opps: %d\n", ret); | |
dfbe4678 VK |
933 | } |
934 | ||
fe2af402 GD |
935 | if (!ret && opp_table->paths) { |
936 | for (i = 0; i < opp_table->path_count; i++) { | |
937 | ret = icc_set_bw(opp_table->paths[i], | |
938 | opp->bandwidth[i].avg, | |
939 | opp->bandwidth[i].peak); | |
940 | if (ret) | |
941 | dev_err(dev, "Failed to set bandwidth[%d]: %d\n", | |
942 | i, ret); | |
943 | } | |
944 | } | |
945 | ||
ca1b5d77 | 946 | put_opp: |
8a31d9d9 | 947 | dev_pm_opp_put(opp); |
052c6f19 | 948 | put_old_opp: |
8a31d9d9 VK |
949 | if (!IS_ERR(old_opp)) |
950 | dev_pm_opp_put(old_opp); | |
052c6f19 | 951 | put_opp_table: |
5b650b38 | 952 | dev_pm_opp_put_opp_table(opp_table); |
052c6f19 | 953 | return ret; |
6a0712f6 VK |
954 | } |
955 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
956 | ||
2c2709dc | 957 | /* OPP-dev Helpers */ |
2c2709dc VK |
958 | static void _remove_opp_dev(struct opp_device *opp_dev, |
959 | struct opp_table *opp_table) | |
06441658 | 960 | { |
2c2709dc VK |
961 | opp_debug_unregister(opp_dev, opp_table); |
962 | list_del(&opp_dev->node); | |
052c6f19 | 963 | kfree(opp_dev); |
06441658 VK |
964 | } |
965 | ||
283d55e6 VK |
966 | static struct opp_device *_add_opp_dev_unlocked(const struct device *dev, |
967 | struct opp_table *opp_table) | |
06441658 | 968 | { |
2c2709dc | 969 | struct opp_device *opp_dev; |
06441658 | 970 | |
2c2709dc VK |
971 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
972 | if (!opp_dev) | |
06441658 VK |
973 | return NULL; |
974 | ||
2c2709dc VK |
975 | /* Initialize opp-dev */ |
976 | opp_dev->dev = dev; | |
3d255699 | 977 | |
052c6f19 | 978 | list_add(&opp_dev->node, &opp_table->dev_list); |
06441658 | 979 | |
2c2709dc | 980 | /* Create debugfs entries for the opp_table */ |
a2dea4cb | 981 | opp_debug_register(opp_dev, opp_table); |
283d55e6 VK |
982 | |
983 | return opp_dev; | |
984 | } | |
985 | ||
986 | struct opp_device *_add_opp_dev(const struct device *dev, | |
987 | struct opp_table *opp_table) | |
988 | { | |
989 | struct opp_device *opp_dev; | |
990 | ||
991 | mutex_lock(&opp_table->lock); | |
992 | opp_dev = _add_opp_dev_unlocked(dev, opp_table); | |
3d255699 | 993 | mutex_unlock(&opp_table->lock); |
deaa5146 | 994 | |
2c2709dc | 995 | return opp_dev; |
06441658 VK |
996 | } |
997 | ||
eb7c8743 | 998 | static struct opp_table *_allocate_opp_table(struct device *dev, int index) |
07cce74a | 999 | { |
2c2709dc VK |
1000 | struct opp_table *opp_table; |
1001 | struct opp_device *opp_dev; | |
d54974c2 | 1002 | int ret; |
07cce74a VK |
1003 | |
1004 | /* | |
2c2709dc | 1005 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
1006 | * device is needed to be added, we pay this penalty. |
1007 | */ | |
2c2709dc VK |
1008 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
1009 | if (!opp_table) | |
07cce74a VK |
1010 | return NULL; |
1011 | ||
3d255699 | 1012 | mutex_init(&opp_table->lock); |
4f018bc0 | 1013 | mutex_init(&opp_table->genpd_virt_dev_lock); |
2c2709dc | 1014 | INIT_LIST_HEAD(&opp_table->dev_list); |
06441658 | 1015 | |
46f48aca VK |
1016 | /* Mark regulator count uninitialized */ |
1017 | opp_table->regulator_count = -1; | |
1018 | ||
2c2709dc VK |
1019 | opp_dev = _add_opp_dev(dev, opp_table); |
1020 | if (!opp_dev) { | |
1021 | kfree(opp_table); | |
06441658 VK |
1022 | return NULL; |
1023 | } | |
1024 | ||
eb7c8743 | 1025 | _of_init_opp_table(opp_table, dev, index); |
50f8cfbd | 1026 | |
d54974c2 | 1027 | /* Find clk for the device */ |
2c2709dc VK |
1028 | opp_table->clk = clk_get(dev, NULL); |
1029 | if (IS_ERR(opp_table->clk)) { | |
1030 | ret = PTR_ERR(opp_table->clk); | |
d54974c2 VK |
1031 | if (ret != -EPROBE_DEFER) |
1032 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, | |
1033 | ret); | |
1034 | } | |
1035 | ||
6d3f922c GD |
1036 | /* Find interconnect path(s) for the device */ |
1037 | ret = dev_pm_opp_of_find_icc_paths(dev, opp_table); | |
1038 | if (ret) | |
1039 | dev_warn(dev, "%s: Error finding interconnect paths: %d\n", | |
1040 | __func__, ret); | |
1041 | ||
052c6f19 | 1042 | BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head); |
2c2709dc | 1043 | INIT_LIST_HEAD(&opp_table->opp_list); |
f067a982 | 1044 | kref_init(&opp_table->kref); |
07cce74a | 1045 | |
2c2709dc | 1046 | /* Secure the device table modification */ |
052c6f19 | 1047 | list_add(&opp_table->node, &opp_tables); |
2c2709dc | 1048 | return opp_table; |
07cce74a VK |
1049 | } |
1050 | ||
f067a982 | 1051 | void _get_opp_table_kref(struct opp_table *opp_table) |
b6160e26 | 1052 | { |
f067a982 VK |
1053 | kref_get(&opp_table->kref); |
1054 | } | |
1055 | ||
eb7c8743 | 1056 | static struct opp_table *_opp_get_opp_table(struct device *dev, int index) |
f067a982 VK |
1057 | { |
1058 | struct opp_table *opp_table; | |
1059 | ||
1060 | /* Hold our table modification lock here */ | |
1061 | mutex_lock(&opp_table_lock); | |
1062 | ||
5b650b38 VK |
1063 | opp_table = _find_opp_table_unlocked(dev); |
1064 | if (!IS_ERR(opp_table)) | |
f067a982 | 1065 | goto unlock; |
f067a982 | 1066 | |
283d55e6 VK |
1067 | opp_table = _managed_opp(dev, index); |
1068 | if (opp_table) { | |
1069 | if (!_add_opp_dev_unlocked(dev, opp_table)) { | |
1070 | dev_pm_opp_put_opp_table(opp_table); | |
1071 | opp_table = NULL; | |
1072 | } | |
1073 | goto unlock; | |
1074 | } | |
1075 | ||
eb7c8743 | 1076 | opp_table = _allocate_opp_table(dev, index); |
f067a982 VK |
1077 | |
1078 | unlock: | |
1079 | mutex_unlock(&opp_table_lock); | |
1080 | ||
1081 | return opp_table; | |
1082 | } | |
eb7c8743 VK |
1083 | |
1084 | struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) | |
1085 | { | |
1086 | return _opp_get_opp_table(dev, 0); | |
1087 | } | |
f067a982 VK |
1088 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); |
1089 | ||
eb7c8743 VK |
1090 | struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, |
1091 | int index) | |
1092 | { | |
1093 | return _opp_get_opp_table(dev, index); | |
1094 | } | |
1095 | ||
b83c1899 | 1096 | static void _opp_table_kref_release(struct kref *kref) |
f067a982 VK |
1097 | { |
1098 | struct opp_table *opp_table = container_of(kref, struct opp_table, kref); | |
cdd6ed90 | 1099 | struct opp_device *opp_dev, *temp; |
6d3f922c | 1100 | int i; |
b6160e26 | 1101 | |
5d6d106f VK |
1102 | _of_clear_opp_table(opp_table); |
1103 | ||
b6160e26 VK |
1104 | /* Release clk */ |
1105 | if (!IS_ERR(opp_table->clk)) | |
1106 | clk_put(opp_table->clk); | |
1107 | ||
6d3f922c GD |
1108 | if (opp_table->paths) { |
1109 | for (i = 0; i < opp_table->path_count; i++) | |
1110 | icc_put(opp_table->paths[i]); | |
1111 | kfree(opp_table->paths); | |
1112 | } | |
1113 | ||
cdd6ed90 | 1114 | WARN_ON(!list_empty(&opp_table->opp_list)); |
b6160e26 | 1115 | |
cdd6ed90 VK |
1116 | list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) { |
1117 | /* | |
1118 | * The OPP table is getting removed, drop the performance state | |
1119 | * constraints. | |
1120 | */ | |
1121 | if (opp_table->genpd_performance_state) | |
1122 | dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0); | |
b6160e26 | 1123 | |
cdd6ed90 VK |
1124 | _remove_opp_dev(opp_dev, opp_table); |
1125 | } | |
b6160e26 | 1126 | |
4f018bc0 | 1127 | mutex_destroy(&opp_table->genpd_virt_dev_lock); |
37a73ec0 | 1128 | mutex_destroy(&opp_table->lock); |
052c6f19 VK |
1129 | list_del(&opp_table->node); |
1130 | kfree(opp_table); | |
b6160e26 | 1131 | |
f067a982 VK |
1132 | mutex_unlock(&opp_table_lock); |
1133 | } | |
1134 | ||
1135 | void dev_pm_opp_put_opp_table(struct opp_table *opp_table) | |
1136 | { | |
1137 | kref_put_mutex(&opp_table->kref, _opp_table_kref_release, | |
1138 | &opp_table_lock); | |
1139 | } | |
1140 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table); | |
1141 | ||
8cd2f6e8 | 1142 | void _opp_free(struct dev_pm_opp *opp) |
969fceb3 VK |
1143 | { |
1144 | kfree(opp); | |
969fceb3 VK |
1145 | } |
1146 | ||
1690d8bb VK |
1147 | static void _opp_kref_release(struct dev_pm_opp *opp, |
1148 | struct opp_table *opp_table) | |
129eec55 VK |
1149 | { |
1150 | /* | |
1151 | * Notify the changes in the availability of the operable | |
1152 | * frequency/voltage list. | |
1153 | */ | |
052c6f19 | 1154 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); |
da544b61 | 1155 | _of_opp_free_required_opps(opp_table, opp); |
deaa5146 | 1156 | opp_debug_remove_one(opp); |
052c6f19 VK |
1157 | list_del(&opp->node); |
1158 | kfree(opp); | |
1690d8bb | 1159 | } |
129eec55 | 1160 | |
1690d8bb VK |
1161 | static void _opp_kref_release_unlocked(struct kref *kref) |
1162 | { | |
1163 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); | |
1164 | struct opp_table *opp_table = opp->opp_table; | |
1165 | ||
1166 | _opp_kref_release(opp, opp_table); | |
1167 | } | |
1168 | ||
1169 | static void _opp_kref_release_locked(struct kref *kref) | |
1170 | { | |
1171 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); | |
1172 | struct opp_table *opp_table = opp->opp_table; | |
1173 | ||
1174 | _opp_kref_release(opp, opp_table); | |
37a73ec0 | 1175 | mutex_unlock(&opp_table->lock); |
129eec55 VK |
1176 | } |
1177 | ||
a88bd2a5 | 1178 | void dev_pm_opp_get(struct dev_pm_opp *opp) |
8a31d9d9 VK |
1179 | { |
1180 | kref_get(&opp->kref); | |
1181 | } | |
1182 | ||
7034764a VK |
1183 | void dev_pm_opp_put(struct dev_pm_opp *opp) |
1184 | { | |
1690d8bb VK |
1185 | kref_put_mutex(&opp->kref, _opp_kref_release_locked, |
1186 | &opp->opp_table->lock); | |
7034764a VK |
1187 | } |
1188 | EXPORT_SYMBOL_GPL(dev_pm_opp_put); | |
1189 | ||
1690d8bb VK |
1190 | static void dev_pm_opp_put_unlocked(struct dev_pm_opp *opp) |
1191 | { | |
1192 | kref_put(&opp->kref, _opp_kref_release_unlocked); | |
1193 | } | |
1194 | ||
129eec55 | 1195 | /** |
2c2709dc | 1196 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
1197 | * @dev: device for which we do this operation |
1198 | * @freq: OPP to remove with matching 'freq' | |
1199 | * | |
2c2709dc | 1200 | * This function removes an opp from the opp table. |
129eec55 VK |
1201 | */ |
1202 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
1203 | { | |
1204 | struct dev_pm_opp *opp; | |
2c2709dc | 1205 | struct opp_table *opp_table; |
129eec55 VK |
1206 | bool found = false; |
1207 | ||
2c2709dc VK |
1208 | opp_table = _find_opp_table(dev); |
1209 | if (IS_ERR(opp_table)) | |
5b650b38 | 1210 | return; |
129eec55 | 1211 | |
37a73ec0 VK |
1212 | mutex_lock(&opp_table->lock); |
1213 | ||
2c2709dc | 1214 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
1215 | if (opp->rate == freq) { |
1216 | found = true; | |
1217 | break; | |
1218 | } | |
1219 | } | |
1220 | ||
37a73ec0 VK |
1221 | mutex_unlock(&opp_table->lock); |
1222 | ||
5b650b38 VK |
1223 | if (found) { |
1224 | dev_pm_opp_put(opp); | |
0ad8c623 VK |
1225 | |
1226 | /* Drop the reference taken by dev_pm_opp_add() */ | |
1227 | dev_pm_opp_put_opp_table(opp_table); | |
5b650b38 | 1228 | } else { |
129eec55 VK |
1229 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", |
1230 | __func__, freq); | |
129eec55 VK |
1231 | } |
1232 | ||
0ad8c623 | 1233 | /* Drop the reference taken by _find_opp_table() */ |
5b650b38 | 1234 | dev_pm_opp_put_opp_table(opp_table); |
129eec55 VK |
1235 | } |
1236 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
1237 | ||
03758d60 VK |
1238 | void _opp_remove_all_static(struct opp_table *opp_table) |
1239 | { | |
1240 | struct dev_pm_opp *opp, *tmp; | |
1241 | ||
1242 | mutex_lock(&opp_table->lock); | |
1243 | ||
1244 | if (!opp_table->parsed_static_opps || --opp_table->parsed_static_opps) | |
1245 | goto unlock; | |
1246 | ||
1247 | list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { | |
1248 | if (!opp->dynamic) | |
1249 | dev_pm_opp_put_unlocked(opp); | |
1250 | } | |
1251 | ||
1252 | unlock: | |
1253 | mutex_unlock(&opp_table->lock); | |
1254 | } | |
1255 | ||
1690d8bb VK |
1256 | /** |
1257 | * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs | |
1258 | * @dev: device for which we do this operation | |
1259 | * | |
1260 | * This function removes all dynamically created OPPs from the opp table. | |
1261 | */ | |
1262 | void dev_pm_opp_remove_all_dynamic(struct device *dev) | |
1263 | { | |
1264 | struct opp_table *opp_table; | |
1265 | struct dev_pm_opp *opp, *temp; | |
1266 | int count = 0; | |
1267 | ||
1268 | opp_table = _find_opp_table(dev); | |
1269 | if (IS_ERR(opp_table)) | |
1270 | return; | |
1271 | ||
1272 | mutex_lock(&opp_table->lock); | |
1273 | list_for_each_entry_safe(opp, temp, &opp_table->opp_list, node) { | |
1274 | if (opp->dynamic) { | |
1275 | dev_pm_opp_put_unlocked(opp); | |
1276 | count++; | |
1277 | } | |
1278 | } | |
1279 | mutex_unlock(&opp_table->lock); | |
1280 | ||
1281 | /* Drop the references taken by dev_pm_opp_add() */ | |
1282 | while (count--) | |
1283 | dev_pm_opp_put_opp_table(opp_table); | |
1284 | ||
1285 | /* Drop the reference taken by _find_opp_table() */ | |
1286 | dev_pm_opp_put_opp_table(opp_table); | |
1287 | } | |
1288 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic); | |
1289 | ||
8cd2f6e8 | 1290 | struct dev_pm_opp *_opp_allocate(struct opp_table *table) |
e1f60b29 | 1291 | { |
23dacf6d | 1292 | struct dev_pm_opp *opp; |
6d3f922c | 1293 | int supply_count, supply_size, icc_size; |
e1f60b29 | 1294 | |
dfbe4678 | 1295 | /* Allocate space for at least one supply */ |
6d3f922c GD |
1296 | supply_count = table->regulator_count > 0 ? table->regulator_count : 1; |
1297 | supply_size = sizeof(*opp->supplies) * supply_count; | |
1298 | icc_size = sizeof(*opp->bandwidth) * table->path_count; | |
e1f60b29 | 1299 | |
dfbe4678 | 1300 | /* allocate new OPP node and supplies structures */ |
6d3f922c GD |
1301 | opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL); |
1302 | ||
8cd2f6e8 | 1303 | if (!opp) |
23dacf6d | 1304 | return NULL; |
23dacf6d | 1305 | |
dfbe4678 VK |
1306 | /* Put the supplies at the end of the OPP structure as an empty array */ |
1307 | opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); | |
6d3f922c GD |
1308 | if (icc_size) |
1309 | opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count); | |
dfbe4678 VK |
1310 | INIT_LIST_HEAD(&opp->node); |
1311 | ||
23dacf6d VK |
1312 | return opp; |
1313 | } | |
1314 | ||
7d34d56e | 1315 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 1316 | struct opp_table *opp_table) |
7d34d56e | 1317 | { |
dfbe4678 VK |
1318 | struct regulator *reg; |
1319 | int i; | |
1320 | ||
90e3577b VK |
1321 | if (!opp_table->regulators) |
1322 | return true; | |
1323 | ||
dfbe4678 VK |
1324 | for (i = 0; i < opp_table->regulator_count; i++) { |
1325 | reg = opp_table->regulators[i]; | |
1326 | ||
1327 | if (!regulator_is_supported_voltage(reg, | |
1328 | opp->supplies[i].u_volt_min, | |
1329 | opp->supplies[i].u_volt_max)) { | |
1330 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
1331 | __func__, opp->supplies[i].u_volt_min, | |
1332 | opp->supplies[i].u_volt_max); | |
1333 | return false; | |
1334 | } | |
7d34d56e VK |
1335 | } |
1336 | ||
1337 | return true; | |
1338 | } | |
1339 | ||
6c591eec SK |
1340 | int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2) |
1341 | { | |
1342 | if (opp1->rate != opp2->rate) | |
1343 | return opp1->rate < opp2->rate ? -1 : 1; | |
6d3f922c GD |
1344 | if (opp1->bandwidth && opp2->bandwidth && |
1345 | opp1->bandwidth[0].peak != opp2->bandwidth[0].peak) | |
1346 | return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1; | |
6c591eec SK |
1347 | if (opp1->level != opp2->level) |
1348 | return opp1->level < opp2->level ? -1 : 1; | |
1349 | return 0; | |
1350 | } | |
1351 | ||
a1e8c136 VK |
1352 | static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp, |
1353 | struct opp_table *opp_table, | |
1354 | struct list_head **head) | |
23dacf6d VK |
1355 | { |
1356 | struct dev_pm_opp *opp; | |
6c591eec | 1357 | int opp_cmp; |
23dacf6d VK |
1358 | |
1359 | /* | |
1360 | * Insert new OPP in order of increasing frequency and discard if | |
1361 | * already present. | |
1362 | * | |
2c2709dc | 1363 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
1364 | * loop, don't replace it with head otherwise it will become an infinite |
1365 | * loop. | |
1366 | */ | |
052c6f19 | 1367 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
6c591eec SK |
1368 | opp_cmp = _opp_compare_key(new_opp, opp); |
1369 | if (opp_cmp > 0) { | |
a1e8c136 | 1370 | *head = &opp->node; |
23dacf6d VK |
1371 | continue; |
1372 | } | |
1373 | ||
6c591eec | 1374 | if (opp_cmp < 0) |
a1e8c136 | 1375 | return 0; |
23dacf6d VK |
1376 | |
1377 | /* Duplicate OPPs */ | |
06441658 | 1378 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
dfbe4678 VK |
1379 | __func__, opp->rate, opp->supplies[0].u_volt, |
1380 | opp->available, new_opp->rate, | |
1381 | new_opp->supplies[0].u_volt, new_opp->available); | |
23dacf6d | 1382 | |
dfbe4678 | 1383 | /* Should we compare voltages for all regulators here ? */ |
a1e8c136 VK |
1384 | return opp->available && |
1385 | new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST; | |
1386 | } | |
1387 | ||
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * Returns: | |
1393 | * 0: On success. And appropriate error message for duplicate OPPs. | |
1394 | * -EBUSY: For OPP with same freq/volt and is available. The callers of | |
1395 | * _opp_add() must return 0 if they receive -EBUSY from it. This is to make | |
1396 | * sure we don't print error messages unnecessarily if different parts of | |
1397 | * kernel try to initialize the OPP table. | |
1398 | * -EEXIST: For OPP with same freq but different volt or is unavailable. This | |
1399 | * should be considered an error by the callers of _opp_add(). | |
1400 | */ | |
1401 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, | |
1402 | struct opp_table *opp_table, bool rate_not_available) | |
1403 | { | |
1404 | struct list_head *head; | |
1405 | int ret; | |
1406 | ||
1407 | mutex_lock(&opp_table->lock); | |
1408 | head = &opp_table->opp_list; | |
37a73ec0 | 1409 | |
a1e8c136 VK |
1410 | if (likely(!rate_not_available)) { |
1411 | ret = _opp_is_duplicate(dev, new_opp, opp_table, &head); | |
1412 | if (ret) { | |
1413 | mutex_unlock(&opp_table->lock); | |
1414 | return ret; | |
1415 | } | |
23dacf6d VK |
1416 | } |
1417 | ||
052c6f19 | 1418 | list_add(&new_opp->node, head); |
37a73ec0 VK |
1419 | mutex_unlock(&opp_table->lock); |
1420 | ||
1421 | new_opp->opp_table = opp_table; | |
7034764a | 1422 | kref_init(&new_opp->kref); |
23dacf6d | 1423 | |
a2dea4cb | 1424 | opp_debug_create_one(new_opp, opp_table); |
deaa5146 | 1425 | |
2c2709dc | 1426 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1427 | new_opp->available = false; |
1428 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1429 | __func__, new_opp->rate); | |
1430 | } | |
1431 | ||
23dacf6d VK |
1432 | return 0; |
1433 | } | |
1434 | ||
984f16c8 | 1435 | /** |
b64b9c3f | 1436 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
8cd2f6e8 | 1437 | * @opp_table: OPP table |
984f16c8 NM |
1438 | * @dev: device for which we do this operation |
1439 | * @freq: Frequency in Hz for this OPP | |
1440 | * @u_volt: Voltage in uVolts for this OPP | |
1441 | * @dynamic: Dynamically added OPPs. | |
1442 | * | |
2c2709dc | 1443 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1444 | * The opp is made available by default and it can be controlled using |
1445 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1446 | * | |
8f8d37b2 VK |
1447 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1448 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1449 | * |
984f16c8 NM |
1450 | * Return: |
1451 | * 0 On success OR | |
1452 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1453 | * -EEXIST Freq are same and volt are different OR | |
1454 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1455 | * -ENOMEM Memory allocation failure | |
1456 | */ | |
8cd2f6e8 VK |
1457 | int _opp_add_v1(struct opp_table *opp_table, struct device *dev, |
1458 | unsigned long freq, long u_volt, bool dynamic) | |
e1f60b29 | 1459 | { |
23dacf6d | 1460 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1461 | unsigned long tol; |
6ce4184d | 1462 | int ret; |
e1f60b29 | 1463 | |
8cd2f6e8 VK |
1464 | new_opp = _opp_allocate(opp_table); |
1465 | if (!new_opp) | |
1466 | return -ENOMEM; | |
23dacf6d | 1467 | |
a7470db6 | 1468 | /* populate the opp table */ |
a7470db6 | 1469 | new_opp->rate = freq; |
2c2709dc | 1470 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
dfbe4678 VK |
1471 | new_opp->supplies[0].u_volt = u_volt; |
1472 | new_opp->supplies[0].u_volt_min = u_volt - tol; | |
1473 | new_opp->supplies[0].u_volt_max = u_volt + tol; | |
a7470db6 | 1474 | new_opp->available = true; |
23dacf6d | 1475 | new_opp->dynamic = dynamic; |
a7470db6 | 1476 | |
a1e8c136 | 1477 | ret = _opp_add(dev, new_opp, opp_table, false); |
7f8538eb VK |
1478 | if (ret) { |
1479 | /* Don't return error for duplicate OPPs */ | |
1480 | if (ret == -EBUSY) | |
1481 | ret = 0; | |
6ce4184d | 1482 | goto free_opp; |
7f8538eb | 1483 | } |
64ce8545 | 1484 | |
03ca370f MH |
1485 | /* |
1486 | * Notify the changes in the availability of the operable | |
1487 | * frequency/voltage list. | |
1488 | */ | |
052c6f19 | 1489 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1490 | return 0; |
6ce4184d VK |
1491 | |
1492 | free_opp: | |
8cd2f6e8 VK |
1493 | _opp_free(new_opp); |
1494 | ||
6ce4184d | 1495 | return ret; |
e1f60b29 | 1496 | } |
38393409 | 1497 | |
7de36b0a VK |
1498 | /** |
1499 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1500 | * @dev: Device for which supported-hw has to be set. | |
1501 | * @versions: Array of hierarchy of versions to match. | |
1502 | * @count: Number of elements in the array. | |
1503 | * | |
1504 | * This is required only for the V2 bindings, and it enables a platform to | |
1505 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1506 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1507 | * property. | |
7de36b0a | 1508 | */ |
fa30184d VK |
1509 | struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, |
1510 | const u32 *versions, unsigned int count) | |
7de36b0a | 1511 | { |
2c2709dc | 1512 | struct opp_table *opp_table; |
7de36b0a | 1513 | |
fa30184d VK |
1514 | opp_table = dev_pm_opp_get_opp_table(dev); |
1515 | if (!opp_table) | |
1516 | return ERR_PTR(-ENOMEM); | |
7de36b0a | 1517 | |
2c2709dc VK |
1518 | /* Make sure there are no concurrent readers while updating opp_table */ |
1519 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1520 | |
25419de1 VK |
1521 | /* Another CPU that shares the OPP table has set the property ? */ |
1522 | if (opp_table->supported_hw) | |
1523 | return opp_table; | |
7de36b0a | 1524 | |
2c2709dc | 1525 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1526 | GFP_KERNEL); |
2c2709dc | 1527 | if (!opp_table->supported_hw) { |
25419de1 VK |
1528 | dev_pm_opp_put_opp_table(opp_table); |
1529 | return ERR_PTR(-ENOMEM); | |
7de36b0a VK |
1530 | } |
1531 | ||
2c2709dc | 1532 | opp_table->supported_hw_count = count; |
fa30184d VK |
1533 | |
1534 | return opp_table; | |
7de36b0a VK |
1535 | } |
1536 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1537 | ||
1538 | /** | |
1539 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
fa30184d | 1540 | * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw(). |
7de36b0a VK |
1541 | * |
1542 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1543 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a | 1544 | * will not be freed. |
7de36b0a | 1545 | */ |
fa30184d | 1546 | void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) |
7de36b0a | 1547 | { |
2c2709dc VK |
1548 | /* Make sure there are no concurrent readers while updating opp_table */ |
1549 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1550 | |
2c2709dc VK |
1551 | kfree(opp_table->supported_hw); |
1552 | opp_table->supported_hw = NULL; | |
1553 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1554 | |
fa30184d | 1555 | dev_pm_opp_put_opp_table(opp_table); |
7de36b0a VK |
1556 | } |
1557 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1558 | ||
01fb4d3c VK |
1559 | /** |
1560 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1561 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1562 | * @name: name to postfix to properties. |
1563 | * | |
1564 | * This is required only for the V2 bindings, and it enables a platform to | |
1565 | * specify the extn to be used for certain property names. The properties to | |
1566 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1567 | * should postfix the property name with -<name> while looking for them. | |
01fb4d3c | 1568 | */ |
fa30184d | 1569 | struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) |
01fb4d3c | 1570 | { |
2c2709dc | 1571 | struct opp_table *opp_table; |
01fb4d3c | 1572 | |
fa30184d VK |
1573 | opp_table = dev_pm_opp_get_opp_table(dev); |
1574 | if (!opp_table) | |
1575 | return ERR_PTR(-ENOMEM); | |
01fb4d3c | 1576 | |
2c2709dc VK |
1577 | /* Make sure there are no concurrent readers while updating opp_table */ |
1578 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1579 | |
878ec1a9 VK |
1580 | /* Another CPU that shares the OPP table has set the property ? */ |
1581 | if (opp_table->prop_name) | |
1582 | return opp_table; | |
01fb4d3c | 1583 | |
2c2709dc VK |
1584 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1585 | if (!opp_table->prop_name) { | |
878ec1a9 VK |
1586 | dev_pm_opp_put_opp_table(opp_table); |
1587 | return ERR_PTR(-ENOMEM); | |
01fb4d3c VK |
1588 | } |
1589 | ||
fa30184d | 1590 | return opp_table; |
01fb4d3c VK |
1591 | } |
1592 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1593 | ||
1594 | /** | |
1595 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
fa30184d | 1596 | * @opp_table: OPP table returned by dev_pm_opp_set_prop_name(). |
01fb4d3c VK |
1597 | * |
1598 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1599 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c | 1600 | * will not be freed. |
01fb4d3c | 1601 | */ |
fa30184d | 1602 | void dev_pm_opp_put_prop_name(struct opp_table *opp_table) |
01fb4d3c | 1603 | { |
2c2709dc VK |
1604 | /* Make sure there are no concurrent readers while updating opp_table */ |
1605 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1606 | |
2c2709dc VK |
1607 | kfree(opp_table->prop_name); |
1608 | opp_table->prop_name = NULL; | |
01fb4d3c | 1609 | |
fa30184d | 1610 | dev_pm_opp_put_opp_table(opp_table); |
01fb4d3c VK |
1611 | } |
1612 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1613 | ||
94735585 VK |
1614 | static int _allocate_set_opp_data(struct opp_table *opp_table) |
1615 | { | |
1616 | struct dev_pm_set_opp_data *data; | |
1617 | int len, count = opp_table->regulator_count; | |
1618 | ||
90e3577b | 1619 | if (WARN_ON(!opp_table->regulators)) |
94735585 VK |
1620 | return -EINVAL; |
1621 | ||
1622 | /* space for set_opp_data */ | |
1623 | len = sizeof(*data); | |
1624 | ||
1625 | /* space for old_opp.supplies and new_opp.supplies */ | |
1626 | len += 2 * sizeof(struct dev_pm_opp_supply) * count; | |
1627 | ||
1628 | data = kzalloc(len, GFP_KERNEL); | |
1629 | if (!data) | |
1630 | return -ENOMEM; | |
1631 | ||
1632 | data->old_opp.supplies = (void *)(data + 1); | |
1633 | data->new_opp.supplies = data->old_opp.supplies + count; | |
1634 | ||
1635 | opp_table->set_opp_data = data; | |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | static void _free_set_opp_data(struct opp_table *opp_table) | |
1641 | { | |
1642 | kfree(opp_table->set_opp_data); | |
1643 | opp_table->set_opp_data = NULL; | |
1644 | } | |
1645 | ||
9f8ea969 | 1646 | /** |
dfbe4678 | 1647 | * dev_pm_opp_set_regulators() - Set regulator names for the device |
9f8ea969 | 1648 | * @dev: Device for which regulator name is being set. |
dfbe4678 VK |
1649 | * @names: Array of pointers to the names of the regulator. |
1650 | * @count: Number of regulators. | |
9f8ea969 VK |
1651 | * |
1652 | * In order to support OPP switching, OPP layer needs to know the name of the | |
dfbe4678 VK |
1653 | * device's regulators, as the core would be required to switch voltages as |
1654 | * well. | |
9f8ea969 VK |
1655 | * |
1656 | * This must be called before any OPPs are initialized for the device. | |
9f8ea969 | 1657 | */ |
dfbe4678 VK |
1658 | struct opp_table *dev_pm_opp_set_regulators(struct device *dev, |
1659 | const char * const names[], | |
1660 | unsigned int count) | |
9f8ea969 | 1661 | { |
2c2709dc | 1662 | struct opp_table *opp_table; |
9f8ea969 | 1663 | struct regulator *reg; |
dfbe4678 | 1664 | int ret, i; |
9f8ea969 | 1665 | |
fa30184d VK |
1666 | opp_table = dev_pm_opp_get_opp_table(dev); |
1667 | if (!opp_table) | |
1668 | return ERR_PTR(-ENOMEM); | |
9f8ea969 VK |
1669 | |
1670 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1671 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1672 | ret = -EBUSY; |
1673 | goto err; | |
1674 | } | |
1675 | ||
779b783c VK |
1676 | /* Another CPU that shares the OPP table has set the regulators ? */ |
1677 | if (opp_table->regulators) | |
1678 | return opp_table; | |
dfbe4678 VK |
1679 | |
1680 | opp_table->regulators = kmalloc_array(count, | |
1681 | sizeof(*opp_table->regulators), | |
1682 | GFP_KERNEL); | |
1683 | if (!opp_table->regulators) { | |
1684 | ret = -ENOMEM; | |
9f8ea969 VK |
1685 | goto err; |
1686 | } | |
1687 | ||
dfbe4678 VK |
1688 | for (i = 0; i < count; i++) { |
1689 | reg = regulator_get_optional(dev, names[i]); | |
1690 | if (IS_ERR(reg)) { | |
1691 | ret = PTR_ERR(reg); | |
1692 | if (ret != -EPROBE_DEFER) | |
1693 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
1694 | __func__, names[i], ret); | |
1695 | goto free_regulators; | |
1696 | } | |
1697 | ||
1698 | opp_table->regulators[i] = reg; | |
1699 | } | |
1700 | ||
1701 | opp_table->regulator_count = count; | |
9f8ea969 | 1702 | |
94735585 VK |
1703 | /* Allocate block only once to pass to set_opp() routines */ |
1704 | ret = _allocate_set_opp_data(opp_table); | |
1705 | if (ret) | |
1706 | goto free_regulators; | |
1707 | ||
91291d9a | 1708 | return opp_table; |
9f8ea969 | 1709 | |
dfbe4678 | 1710 | free_regulators: |
24957db1 MS |
1711 | while (i != 0) |
1712 | regulator_put(opp_table->regulators[--i]); | |
dfbe4678 VK |
1713 | |
1714 | kfree(opp_table->regulators); | |
1715 | opp_table->regulators = NULL; | |
46f48aca | 1716 | opp_table->regulator_count = -1; |
9f8ea969 | 1717 | err: |
fa30184d | 1718 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1719 | |
91291d9a | 1720 | return ERR_PTR(ret); |
9f8ea969 | 1721 | } |
dfbe4678 | 1722 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); |
9f8ea969 VK |
1723 | |
1724 | /** | |
dfbe4678 VK |
1725 | * dev_pm_opp_put_regulators() - Releases resources blocked for regulator |
1726 | * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). | |
9f8ea969 | 1727 | */ |
dfbe4678 | 1728 | void dev_pm_opp_put_regulators(struct opp_table *opp_table) |
9f8ea969 | 1729 | { |
dfbe4678 VK |
1730 | int i; |
1731 | ||
779b783c VK |
1732 | if (!opp_table->regulators) |
1733 | goto put_opp_table; | |
9f8ea969 | 1734 | |
2c2709dc VK |
1735 | /* Make sure there are no concurrent readers while updating opp_table */ |
1736 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
9f8ea969 | 1737 | |
8d45719c KK |
1738 | if (opp_table->regulator_enabled) { |
1739 | for (i = opp_table->regulator_count - 1; i >= 0; i--) | |
1740 | regulator_disable(opp_table->regulators[i]); | |
1741 | ||
1742 | opp_table->regulator_enabled = false; | |
1743 | } | |
1744 | ||
24957db1 | 1745 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
dfbe4678 VK |
1746 | regulator_put(opp_table->regulators[i]); |
1747 | ||
94735585 VK |
1748 | _free_set_opp_data(opp_table); |
1749 | ||
dfbe4678 VK |
1750 | kfree(opp_table->regulators); |
1751 | opp_table->regulators = NULL; | |
46f48aca | 1752 | opp_table->regulator_count = -1; |
9f8ea969 | 1753 | |
779b783c | 1754 | put_opp_table: |
fa30184d | 1755 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1756 | } |
dfbe4678 | 1757 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); |
9f8ea969 | 1758 | |
829a4e8c VK |
1759 | /** |
1760 | * dev_pm_opp_set_clkname() - Set clk name for the device | |
1761 | * @dev: Device for which clk name is being set. | |
1762 | * @name: Clk name. | |
1763 | * | |
1764 | * In order to support OPP switching, OPP layer needs to get pointer to the | |
1765 | * clock for the device. Simple cases work fine without using this routine (i.e. | |
1766 | * by passing connection-id as NULL), but for a device with multiple clocks | |
1767 | * available, the OPP core needs to know the exact name of the clk to use. | |
1768 | * | |
1769 | * This must be called before any OPPs are initialized for the device. | |
1770 | */ | |
1771 | struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name) | |
1772 | { | |
1773 | struct opp_table *opp_table; | |
1774 | int ret; | |
1775 | ||
1776 | opp_table = dev_pm_opp_get_opp_table(dev); | |
1777 | if (!opp_table) | |
1778 | return ERR_PTR(-ENOMEM); | |
1779 | ||
1780 | /* This should be called before OPPs are initialized */ | |
1781 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
1782 | ret = -EBUSY; | |
1783 | goto err; | |
1784 | } | |
1785 | ||
1786 | /* Already have default clk set, free it */ | |
1787 | if (!IS_ERR(opp_table->clk)) | |
1788 | clk_put(opp_table->clk); | |
1789 | ||
1790 | /* Find clk for the device */ | |
1791 | opp_table->clk = clk_get(dev, name); | |
1792 | if (IS_ERR(opp_table->clk)) { | |
1793 | ret = PTR_ERR(opp_table->clk); | |
1794 | if (ret != -EPROBE_DEFER) { | |
1795 | dev_err(dev, "%s: Couldn't find clock: %d\n", __func__, | |
1796 | ret); | |
1797 | } | |
1798 | goto err; | |
1799 | } | |
1800 | ||
1801 | return opp_table; | |
1802 | ||
1803 | err: | |
1804 | dev_pm_opp_put_opp_table(opp_table); | |
1805 | ||
1806 | return ERR_PTR(ret); | |
1807 | } | |
1808 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname); | |
1809 | ||
1810 | /** | |
1811 | * dev_pm_opp_put_clkname() - Releases resources blocked for clk. | |
1812 | * @opp_table: OPP table returned from dev_pm_opp_set_clkname(). | |
1813 | */ | |
1814 | void dev_pm_opp_put_clkname(struct opp_table *opp_table) | |
1815 | { | |
1816 | /* Make sure there are no concurrent readers while updating opp_table */ | |
1817 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1818 | ||
1819 | clk_put(opp_table->clk); | |
1820 | opp_table->clk = ERR_PTR(-EINVAL); | |
1821 | ||
1822 | dev_pm_opp_put_opp_table(opp_table); | |
1823 | } | |
1824 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname); | |
1825 | ||
4dab160e VK |
1826 | /** |
1827 | * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
1828 | * @dev: Device for which the helper is getting registered. | |
1829 | * @set_opp: Custom set OPP helper. | |
1830 | * | |
1831 | * This is useful to support complex platforms (like platforms with multiple | |
1832 | * regulators per device), instead of the generic OPP set rate helper. | |
1833 | * | |
1834 | * This must be called before any OPPs are initialized for the device. | |
4dab160e | 1835 | */ |
fa30184d | 1836 | struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, |
4dab160e VK |
1837 | int (*set_opp)(struct dev_pm_set_opp_data *data)) |
1838 | { | |
1839 | struct opp_table *opp_table; | |
4dab160e VK |
1840 | |
1841 | if (!set_opp) | |
fa30184d | 1842 | return ERR_PTR(-EINVAL); |
4dab160e | 1843 | |
fa30184d VK |
1844 | opp_table = dev_pm_opp_get_opp_table(dev); |
1845 | if (!opp_table) | |
1846 | return ERR_PTR(-ENOMEM); | |
4dab160e VK |
1847 | |
1848 | /* This should be called before OPPs are initialized */ | |
1849 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
5019acc6 VK |
1850 | dev_pm_opp_put_opp_table(opp_table); |
1851 | return ERR_PTR(-EBUSY); | |
4dab160e VK |
1852 | } |
1853 | ||
5019acc6 VK |
1854 | /* Another CPU that shares the OPP table has set the helper ? */ |
1855 | if (!opp_table->set_opp) | |
1856 | opp_table->set_opp = set_opp; | |
4dab160e | 1857 | |
fa30184d | 1858 | return opp_table; |
4dab160e VK |
1859 | } |
1860 | EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); | |
1861 | ||
1862 | /** | |
604a7aeb | 1863 | * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for |
4dab160e | 1864 | * set_opp helper |
fa30184d | 1865 | * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper(). |
4dab160e | 1866 | * |
fa30184d | 1867 | * Release resources blocked for platform specific set_opp helper. |
4dab160e | 1868 | */ |
604a7aeb | 1869 | void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) |
4dab160e | 1870 | { |
4dab160e VK |
1871 | /* Make sure there are no concurrent readers while updating opp_table */ |
1872 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1873 | ||
1874 | opp_table->set_opp = NULL; | |
fa30184d | 1875 | dev_pm_opp_put_opp_table(opp_table); |
4dab160e | 1876 | } |
604a7aeb | 1877 | EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper); |
4dab160e | 1878 | |
6319aee1 VK |
1879 | static void _opp_detach_genpd(struct opp_table *opp_table) |
1880 | { | |
1881 | int index; | |
1882 | ||
1883 | for (index = 0; index < opp_table->required_opp_count; index++) { | |
1884 | if (!opp_table->genpd_virt_devs[index]) | |
1885 | continue; | |
1886 | ||
1887 | dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false); | |
1888 | opp_table->genpd_virt_devs[index] = NULL; | |
1889 | } | |
c0ab9e08 VK |
1890 | |
1891 | kfree(opp_table->genpd_virt_devs); | |
1892 | opp_table->genpd_virt_devs = NULL; | |
6319aee1 VK |
1893 | } |
1894 | ||
4f018bc0 | 1895 | /** |
6319aee1 VK |
1896 | * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer |
1897 | * @dev: Consumer device for which the genpd is getting attached. | |
1898 | * @names: Null terminated array of pointers containing names of genpd to attach. | |
17a8f868 | 1899 | * @virt_devs: Pointer to return the array of virtual devices. |
4f018bc0 VK |
1900 | * |
1901 | * Multiple generic power domains for a device are supported with the help of | |
1902 | * virtual genpd devices, which are created for each consumer device - genpd | |
1903 | * pair. These are the device structures which are attached to the power domain | |
1904 | * and are required by the OPP core to set the performance state of the genpd. | |
6319aee1 VK |
1905 | * The same API also works for the case where single genpd is available and so |
1906 | * we don't need to support that separately. | |
4f018bc0 VK |
1907 | * |
1908 | * This helper will normally be called by the consumer driver of the device | |
6319aee1 | 1909 | * "dev", as only that has details of the genpd names. |
4f018bc0 | 1910 | * |
6319aee1 VK |
1911 | * This helper needs to be called once with a list of all genpd to attach. |
1912 | * Otherwise the original device structure will be used instead by the OPP core. | |
baea35e4 VK |
1913 | * |
1914 | * The order of entries in the names array must match the order in which | |
1915 | * "required-opps" are added in DT. | |
4f018bc0 | 1916 | */ |
17a8f868 VK |
1917 | struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, |
1918 | const char **names, struct device ***virt_devs) | |
4f018bc0 VK |
1919 | { |
1920 | struct opp_table *opp_table; | |
6319aee1 | 1921 | struct device *virt_dev; |
baea35e4 | 1922 | int index = 0, ret = -EINVAL; |
6319aee1 | 1923 | const char **name = names; |
4f018bc0 VK |
1924 | |
1925 | opp_table = dev_pm_opp_get_opp_table(dev); | |
1926 | if (!opp_table) | |
1927 | return ERR_PTR(-ENOMEM); | |
1928 | ||
6319aee1 VK |
1929 | /* |
1930 | * If the genpd's OPP table isn't already initialized, parsing of the | |
1931 | * required-opps fail for dev. We should retry this after genpd's OPP | |
1932 | * table is added. | |
1933 | */ | |
1934 | if (!opp_table->required_opp_count) { | |
1935 | ret = -EPROBE_DEFER; | |
1936 | goto put_table; | |
1937 | } | |
1938 | ||
4f018bc0 VK |
1939 | mutex_lock(&opp_table->genpd_virt_dev_lock); |
1940 | ||
c0ab9e08 VK |
1941 | opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count, |
1942 | sizeof(*opp_table->genpd_virt_devs), | |
1943 | GFP_KERNEL); | |
1944 | if (!opp_table->genpd_virt_devs) | |
1945 | goto unlock; | |
4f018bc0 | 1946 | |
6319aee1 | 1947 | while (*name) { |
6319aee1 VK |
1948 | if (index >= opp_table->required_opp_count) { |
1949 | dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n", | |
1950 | *name, opp_table->required_opp_count, index); | |
1951 | goto err; | |
1952 | } | |
4f018bc0 | 1953 | |
6319aee1 VK |
1954 | if (opp_table->genpd_virt_devs[index]) { |
1955 | dev_err(dev, "Genpd virtual device already set %s\n", | |
1956 | *name); | |
1957 | goto err; | |
1958 | } | |
1959 | ||
1960 | virt_dev = dev_pm_domain_attach_by_name(dev, *name); | |
1961 | if (IS_ERR(virt_dev)) { | |
1962 | ret = PTR_ERR(virt_dev); | |
1963 | dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret); | |
1964 | goto err; | |
1965 | } | |
1966 | ||
1967 | opp_table->genpd_virt_devs[index] = virt_dev; | |
baea35e4 | 1968 | index++; |
6319aee1 | 1969 | name++; |
4f018bc0 VK |
1970 | } |
1971 | ||
17a8f868 VK |
1972 | if (virt_devs) |
1973 | *virt_devs = opp_table->genpd_virt_devs; | |
4f018bc0 VK |
1974 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
1975 | ||
1976 | return opp_table; | |
6319aee1 VK |
1977 | |
1978 | err: | |
1979 | _opp_detach_genpd(opp_table); | |
c0ab9e08 | 1980 | unlock: |
6319aee1 VK |
1981 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
1982 | ||
1983 | put_table: | |
1984 | dev_pm_opp_put_opp_table(opp_table); | |
1985 | ||
1986 | return ERR_PTR(ret); | |
4f018bc0 | 1987 | } |
6319aee1 | 1988 | EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd); |
4f018bc0 VK |
1989 | |
1990 | /** | |
6319aee1 VK |
1991 | * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device. |
1992 | * @opp_table: OPP table returned by dev_pm_opp_attach_genpd(). | |
4f018bc0 | 1993 | * |
6319aee1 VK |
1994 | * This detaches the genpd(s), resets the virtual device pointers, and puts the |
1995 | * OPP table. | |
4f018bc0 | 1996 | */ |
6319aee1 | 1997 | void dev_pm_opp_detach_genpd(struct opp_table *opp_table) |
4f018bc0 | 1998 | { |
4f018bc0 VK |
1999 | /* |
2000 | * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting | |
2001 | * used in parallel. | |
2002 | */ | |
2003 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
6319aee1 | 2004 | _opp_detach_genpd(opp_table); |
4f018bc0 VK |
2005 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
2006 | ||
6319aee1 | 2007 | dev_pm_opp_put_opp_table(opp_table); |
4f018bc0 | 2008 | } |
6319aee1 | 2009 | EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd); |
4f018bc0 | 2010 | |
c8a59103 VK |
2011 | /** |
2012 | * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table. | |
2013 | * @src_table: OPP table which has dst_table as one of its required OPP table. | |
2014 | * @dst_table: Required OPP table of the src_table. | |
2015 | * @pstate: Current performance state of the src_table. | |
2016 | * | |
2017 | * This Returns pstate of the OPP (present in @dst_table) pointed out by the | |
2018 | * "required-opps" property of the OPP (present in @src_table) which has | |
2019 | * performance state set to @pstate. | |
2020 | * | |
2021 | * Return: Zero or positive performance state on success, otherwise negative | |
2022 | * value on errors. | |
2023 | */ | |
2024 | int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, | |
2025 | struct opp_table *dst_table, | |
2026 | unsigned int pstate) | |
2027 | { | |
2028 | struct dev_pm_opp *opp; | |
2029 | int dest_pstate = -EINVAL; | |
2030 | int i; | |
2031 | ||
2032 | if (!pstate) | |
2033 | return 0; | |
2034 | ||
2035 | /* | |
2036 | * Normally the src_table will have the "required_opps" property set to | |
2037 | * point to one of the OPPs in the dst_table, but in some cases the | |
2038 | * genpd and its master have one to one mapping of performance states | |
2039 | * and so none of them have the "required-opps" property set. Return the | |
2040 | * pstate of the src_table as it is in such cases. | |
2041 | */ | |
2042 | if (!src_table->required_opp_count) | |
2043 | return pstate; | |
2044 | ||
2045 | for (i = 0; i < src_table->required_opp_count; i++) { | |
2046 | if (src_table->required_opp_tables[i]->np == dst_table->np) | |
2047 | break; | |
2048 | } | |
2049 | ||
2050 | if (unlikely(i == src_table->required_opp_count)) { | |
2051 | pr_err("%s: Couldn't find matching OPP table (%p: %p)\n", | |
2052 | __func__, src_table, dst_table); | |
2053 | return -EINVAL; | |
2054 | } | |
2055 | ||
2056 | mutex_lock(&src_table->lock); | |
2057 | ||
2058 | list_for_each_entry(opp, &src_table->opp_list, node) { | |
2059 | if (opp->pstate == pstate) { | |
2060 | dest_pstate = opp->required_opps[i]->pstate; | |
2061 | goto unlock; | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table, | |
2066 | dst_table); | |
2067 | ||
2068 | unlock: | |
2069 | mutex_unlock(&src_table->lock); | |
2070 | ||
2071 | return dest_pstate; | |
2072 | } | |
2073 | ||
38393409 VK |
2074 | /** |
2075 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
2076 | * @dev: device for which we do this operation | |
2077 | * @freq: Frequency in Hz for this OPP | |
2078 | * @u_volt: Voltage in uVolts for this OPP | |
2079 | * | |
2c2709dc | 2080 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
2081 | * The opp is made available by default and it can be controlled using |
2082 | * dev_pm_opp_enable/disable functions. | |
2083 | * | |
38393409 | 2084 | * Return: |
984f16c8 | 2085 | * 0 On success OR |
38393409 | 2086 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 2087 | * -EEXIST Freq are same and volt are different OR |
38393409 | 2088 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 2089 | * -ENOMEM Memory allocation failure |
38393409 VK |
2090 | */ |
2091 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
2092 | { | |
8cd2f6e8 VK |
2093 | struct opp_table *opp_table; |
2094 | int ret; | |
2095 | ||
b83c1899 VK |
2096 | opp_table = dev_pm_opp_get_opp_table(dev); |
2097 | if (!opp_table) | |
2098 | return -ENOMEM; | |
8cd2f6e8 | 2099 | |
46f48aca VK |
2100 | /* Fix regulator count for dynamic OPPs */ |
2101 | opp_table->regulator_count = 1; | |
2102 | ||
8cd2f6e8 | 2103 | ret = _opp_add_v1(opp_table, dev, freq, u_volt, true); |
0ad8c623 VK |
2104 | if (ret) |
2105 | dev_pm_opp_put_opp_table(opp_table); | |
8cd2f6e8 | 2106 | |
8cd2f6e8 | 2107 | return ret; |
38393409 | 2108 | } |
5d4879cd | 2109 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
2110 | |
2111 | /** | |
327854c8 | 2112 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
2113 | * @dev: device for which we do this operation |
2114 | * @freq: OPP frequency to modify availability | |
2115 | * @availability_req: availability status requested for this opp | |
2116 | * | |
052c6f19 VK |
2117 | * Set the availability of an OPP, opp_{enable,disable} share a common logic |
2118 | * which is isolated here. | |
e1f60b29 | 2119 | * |
984f16c8 | 2120 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2121 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 | 2122 | * successful. |
e1f60b29 | 2123 | */ |
327854c8 NM |
2124 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
2125 | bool availability_req) | |
e1f60b29 | 2126 | { |
2c2709dc | 2127 | struct opp_table *opp_table; |
a7f3987e | 2128 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
2129 | int r = 0; |
2130 | ||
2c2709dc VK |
2131 | /* Find the opp_table */ |
2132 | opp_table = _find_opp_table(dev); | |
2133 | if (IS_ERR(opp_table)) { | |
2134 | r = PTR_ERR(opp_table); | |
e1f60b29 | 2135 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
a7f3987e | 2136 | return r; |
e1f60b29 NM |
2137 | } |
2138 | ||
37a73ec0 VK |
2139 | mutex_lock(&opp_table->lock); |
2140 | ||
e1f60b29 | 2141 | /* Do we have the frequency? */ |
2c2709dc | 2142 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
2143 | if (tmp_opp->rate == freq) { |
2144 | opp = tmp_opp; | |
2145 | break; | |
2146 | } | |
2147 | } | |
37a73ec0 | 2148 | |
e1f60b29 NM |
2149 | if (IS_ERR(opp)) { |
2150 | r = PTR_ERR(opp); | |
2151 | goto unlock; | |
2152 | } | |
2153 | ||
2154 | /* Is update really needed? */ | |
2155 | if (opp->available == availability_req) | |
2156 | goto unlock; | |
e1f60b29 | 2157 | |
a7f3987e | 2158 | opp->available = availability_req; |
e1f60b29 | 2159 | |
e4d8ae00 VK |
2160 | dev_pm_opp_get(opp); |
2161 | mutex_unlock(&opp_table->lock); | |
2162 | ||
03ca370f MH |
2163 | /* Notify the change of the OPP availability */ |
2164 | if (availability_req) | |
052c6f19 | 2165 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE, |
a7f3987e | 2166 | opp); |
03ca370f | 2167 | else |
052c6f19 | 2168 | blocking_notifier_call_chain(&opp_table->head, |
a7f3987e | 2169 | OPP_EVENT_DISABLE, opp); |
e1f60b29 | 2170 | |
e4d8ae00 VK |
2171 | dev_pm_opp_put(opp); |
2172 | goto put_table; | |
2173 | ||
e1f60b29 | 2174 | unlock: |
5b650b38 | 2175 | mutex_unlock(&opp_table->lock); |
e4d8ae00 | 2176 | put_table: |
5b650b38 | 2177 | dev_pm_opp_put_opp_table(opp_table); |
e1f60b29 NM |
2178 | return r; |
2179 | } | |
2180 | ||
25cb20a2 SB |
2181 | /** |
2182 | * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP | |
2183 | * @dev: device for which we do this operation | |
2184 | * @freq: OPP frequency to adjust voltage of | |
2185 | * @u_volt: new OPP target voltage | |
2186 | * @u_volt_min: new OPP min voltage | |
2187 | * @u_volt_max: new OPP max voltage | |
2188 | * | |
2189 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
2190 | * copy operation, returns 0 if no modifcation was done OR modification was | |
2191 | * successful. | |
2192 | */ | |
2193 | int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, | |
2194 | unsigned long u_volt, unsigned long u_volt_min, | |
2195 | unsigned long u_volt_max) | |
2196 | ||
2197 | { | |
2198 | struct opp_table *opp_table; | |
2199 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); | |
2200 | int r = 0; | |
2201 | ||
2202 | /* Find the opp_table */ | |
2203 | opp_table = _find_opp_table(dev); | |
2204 | if (IS_ERR(opp_table)) { | |
2205 | r = PTR_ERR(opp_table); | |
2206 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); | |
2207 | return r; | |
2208 | } | |
2209 | ||
2210 | mutex_lock(&opp_table->lock); | |
2211 | ||
2212 | /* Do we have the frequency? */ | |
2213 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { | |
2214 | if (tmp_opp->rate == freq) { | |
2215 | opp = tmp_opp; | |
2216 | break; | |
2217 | } | |
2218 | } | |
2219 | ||
2220 | if (IS_ERR(opp)) { | |
2221 | r = PTR_ERR(opp); | |
2222 | goto adjust_unlock; | |
2223 | } | |
2224 | ||
2225 | /* Is update really needed? */ | |
2226 | if (opp->supplies->u_volt == u_volt) | |
2227 | goto adjust_unlock; | |
2228 | ||
2229 | opp->supplies->u_volt = u_volt; | |
2230 | opp->supplies->u_volt_min = u_volt_min; | |
2231 | opp->supplies->u_volt_max = u_volt_max; | |
2232 | ||
2233 | dev_pm_opp_get(opp); | |
2234 | mutex_unlock(&opp_table->lock); | |
2235 | ||
2236 | /* Notify the voltage change of the OPP */ | |
2237 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE, | |
2238 | opp); | |
2239 | ||
2240 | dev_pm_opp_put(opp); | |
2241 | goto adjust_put_table; | |
2242 | ||
2243 | adjust_unlock: | |
2244 | mutex_unlock(&opp_table->lock); | |
2245 | adjust_put_table: | |
2246 | dev_pm_opp_put_opp_table(opp_table); | |
2247 | return r; | |
2248 | } | |
2249 | ||
e1f60b29 | 2250 | /** |
5d4879cd | 2251 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
2252 | * @dev: device for which we do this operation |
2253 | * @freq: OPP frequency to enable | |
2254 | * | |
2255 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
2256 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 2257 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 2258 | * |
984f16c8 | 2259 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2260 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 2261 | * successful. |
e1f60b29 | 2262 | */ |
5d4879cd | 2263 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 2264 | { |
327854c8 | 2265 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 2266 | } |
5d4879cd | 2267 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
2268 | |
2269 | /** | |
5d4879cd | 2270 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
2271 | * @dev: device for which we do this operation |
2272 | * @freq: OPP frequency to disable | |
2273 | * | |
2274 | * Disables a provided opp. If the operation is valid, this returns | |
2275 | * 0, else the corresponding error value. It is meant to be a temporary | |
2276 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 2277 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 2278 | * |
984f16c8 | 2279 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2280 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 2281 | * successful. |
e1f60b29 | 2282 | */ |
5d4879cd | 2283 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 2284 | { |
327854c8 | 2285 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 2286 | } |
5d4879cd | 2287 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 2288 | |
03ca370f | 2289 | /** |
dc2c9ad5 VK |
2290 | * dev_pm_opp_register_notifier() - Register OPP notifier for the device |
2291 | * @dev: Device for which notifier needs to be registered | |
2292 | * @nb: Notifier block to be registered | |
984f16c8 | 2293 | * |
dc2c9ad5 VK |
2294 | * Return: 0 on success or a negative error value. |
2295 | */ | |
2296 | int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) | |
2297 | { | |
2298 | struct opp_table *opp_table; | |
2299 | int ret; | |
2300 | ||
dc2c9ad5 | 2301 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2302 | if (IS_ERR(opp_table)) |
2303 | return PTR_ERR(opp_table); | |
2304 | ||
052c6f19 | 2305 | ret = blocking_notifier_chain_register(&opp_table->head, nb); |
dc2c9ad5 | 2306 | |
5b650b38 | 2307 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2308 | |
2309 | return ret; | |
2310 | } | |
2311 | EXPORT_SYMBOL(dev_pm_opp_register_notifier); | |
2312 | ||
2313 | /** | |
2314 | * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device | |
2315 | * @dev: Device for which notifier needs to be unregistered | |
2316 | * @nb: Notifier block to be unregistered | |
984f16c8 | 2317 | * |
dc2c9ad5 | 2318 | * Return: 0 on success or a negative error value. |
03ca370f | 2319 | */ |
dc2c9ad5 VK |
2320 | int dev_pm_opp_unregister_notifier(struct device *dev, |
2321 | struct notifier_block *nb) | |
03ca370f | 2322 | { |
dc2c9ad5 VK |
2323 | struct opp_table *opp_table; |
2324 | int ret; | |
03ca370f | 2325 | |
dc2c9ad5 | 2326 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2327 | if (IS_ERR(opp_table)) |
2328 | return PTR_ERR(opp_table); | |
dc2c9ad5 | 2329 | |
052c6f19 | 2330 | ret = blocking_notifier_chain_unregister(&opp_table->head, nb); |
03ca370f | 2331 | |
5b650b38 | 2332 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2333 | |
2334 | return ret; | |
03ca370f | 2335 | } |
dc2c9ad5 | 2336 | EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); |
b496dfbc | 2337 | |
2a4eb735 | 2338 | void _dev_pm_opp_find_and_remove_table(struct device *dev) |
9274c892 VK |
2339 | { |
2340 | struct opp_table *opp_table; | |
2341 | ||
2c2709dc VK |
2342 | /* Check for existing table for 'dev' */ |
2343 | opp_table = _find_opp_table(dev); | |
2344 | if (IS_ERR(opp_table)) { | |
2345 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
2346 | |
2347 | if (error != -ENODEV) | |
2c2709dc | 2348 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
2349 | IS_ERR_OR_NULL(dev) ? |
2350 | "Invalid device" : dev_name(dev), | |
2351 | error); | |
5b650b38 | 2352 | return; |
737002b5 VK |
2353 | } |
2354 | ||
03758d60 | 2355 | _opp_remove_all_static(opp_table); |
cdd6ed90 VK |
2356 | |
2357 | /* Drop reference taken by _find_opp_table() */ | |
2358 | dev_pm_opp_put_opp_table(opp_table); | |
737002b5 | 2359 | |
cdd6ed90 | 2360 | /* Drop reference taken while the OPP table was added */ |
5b650b38 | 2361 | dev_pm_opp_put_opp_table(opp_table); |
737002b5 | 2362 | } |
129eec55 VK |
2363 | |
2364 | /** | |
411466c5 | 2365 | * dev_pm_opp_remove_table() - Free all OPPs associated with the device |
2c2709dc | 2366 | * @dev: device pointer used to lookup OPP table. |
129eec55 | 2367 | * |
411466c5 SH |
2368 | * Free both OPPs created using static entries present in DT and the |
2369 | * dynamically added entries. | |
129eec55 | 2370 | */ |
411466c5 | 2371 | void dev_pm_opp_remove_table(struct device *dev) |
129eec55 | 2372 | { |
2a4eb735 | 2373 | _dev_pm_opp_find_and_remove_table(dev); |
8d4d4e98 | 2374 | } |
411466c5 | 2375 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |