Commit | Line | Data |
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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 | |
067b7ce0 JZ |
404 | static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, |
405 | unsigned long *freq) | |
406 | { | |
407 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
408 | ||
052c6f19 VK |
409 | mutex_lock(&opp_table->lock); |
410 | ||
411 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
067b7ce0 JZ |
412 | if (temp_opp->available && temp_opp->rate >= *freq) { |
413 | opp = temp_opp; | |
414 | *freq = opp->rate; | |
8a31d9d9 VK |
415 | |
416 | /* Increment the reference count of OPP */ | |
417 | dev_pm_opp_get(opp); | |
067b7ce0 JZ |
418 | break; |
419 | } | |
420 | } | |
421 | ||
052c6f19 VK |
422 | mutex_unlock(&opp_table->lock); |
423 | ||
067b7ce0 JZ |
424 | return opp; |
425 | } | |
426 | ||
e1f60b29 | 427 | /** |
5d4879cd | 428 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
429 | * @dev: device for which we do this operation |
430 | * @freq: Start frequency | |
431 | * | |
432 | * Search for the matching ceil *available* OPP from a starting freq | |
433 | * for a device. | |
434 | * | |
984f16c8 | 435 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
436 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
437 | * values can be: | |
438 | * EINVAL: for bad pointer | |
439 | * ERANGE: no match found for search | |
440 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 441 | * |
8a31d9d9 VK |
442 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
443 | * use. | |
e1f60b29 | 444 | */ |
47d43ba7 NM |
445 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
446 | unsigned long *freq) | |
e1f60b29 | 447 | { |
2c2709dc | 448 | struct opp_table *opp_table; |
8a31d9d9 | 449 | struct dev_pm_opp *opp; |
b02ded24 | 450 | |
e1f60b29 NM |
451 | if (!dev || !freq) { |
452 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
453 | return ERR_PTR(-EINVAL); | |
454 | } | |
455 | ||
2c2709dc | 456 | opp_table = _find_opp_table(dev); |
5b650b38 | 457 | if (IS_ERR(opp_table)) |
2c2709dc | 458 | return ERR_CAST(opp_table); |
5b650b38 | 459 | |
8a31d9d9 | 460 | opp = _find_freq_ceil(opp_table, freq); |
e1f60b29 | 461 | |
5b650b38 | 462 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 VK |
463 | |
464 | return opp; | |
e1f60b29 | 465 | } |
5d4879cd | 466 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
467 | |
468 | /** | |
5d4879cd | 469 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
470 | * @dev: device for which we do this operation |
471 | * @freq: Start frequency | |
472 | * | |
473 | * Search for the matching floor *available* OPP from a starting freq | |
474 | * for a device. | |
475 | * | |
984f16c8 | 476 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
477 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
478 | * values can be: | |
479 | * EINVAL: for bad pointer | |
480 | * ERANGE: no match found for search | |
481 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 482 | * |
8a31d9d9 VK |
483 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
484 | * use. | |
e1f60b29 | 485 | */ |
47d43ba7 NM |
486 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
487 | unsigned long *freq) | |
e1f60b29 | 488 | { |
2c2709dc | 489 | struct opp_table *opp_table; |
47d43ba7 | 490 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 NM |
491 | |
492 | if (!dev || !freq) { | |
493 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
494 | return ERR_PTR(-EINVAL); | |
495 | } | |
496 | ||
2c2709dc | 497 | opp_table = _find_opp_table(dev); |
5b650b38 | 498 | if (IS_ERR(opp_table)) |
2c2709dc | 499 | return ERR_CAST(opp_table); |
5b650b38 | 500 | |
052c6f19 | 501 | mutex_lock(&opp_table->lock); |
e1f60b29 | 502 | |
052c6f19 | 503 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
504 | if (temp_opp->available) { |
505 | /* go to the next node, before choosing prev */ | |
506 | if (temp_opp->rate > *freq) | |
507 | break; | |
508 | else | |
509 | opp = temp_opp; | |
510 | } | |
511 | } | |
8a31d9d9 VK |
512 | |
513 | /* Increment the reference count of OPP */ | |
514 | if (!IS_ERR(opp)) | |
515 | dev_pm_opp_get(opp); | |
052c6f19 | 516 | mutex_unlock(&opp_table->lock); |
5b650b38 | 517 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 518 | |
e1f60b29 NM |
519 | if (!IS_ERR(opp)) |
520 | *freq = opp->rate; | |
521 | ||
522 | return opp; | |
523 | } | |
5d4879cd | 524 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 525 | |
2f36bde0 AC |
526 | /** |
527 | * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for | |
528 | * target voltage. | |
529 | * @dev: Device for which we do this operation. | |
530 | * @u_volt: Target voltage. | |
531 | * | |
532 | * Search for OPP with highest (ceil) frequency and has voltage <= u_volt. | |
533 | * | |
534 | * Return: matching *opp, else returns ERR_PTR in case of error which should be | |
535 | * handled using IS_ERR. | |
536 | * | |
537 | * Error return values can be: | |
538 | * EINVAL: bad parameters | |
539 | * | |
540 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
541 | * use. | |
542 | */ | |
543 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev, | |
544 | unsigned long u_volt) | |
545 | { | |
546 | struct opp_table *opp_table; | |
547 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
548 | ||
549 | if (!dev || !u_volt) { | |
550 | dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__, | |
551 | u_volt); | |
552 | return ERR_PTR(-EINVAL); | |
553 | } | |
554 | ||
555 | opp_table = _find_opp_table(dev); | |
556 | if (IS_ERR(opp_table)) | |
557 | return ERR_CAST(opp_table); | |
558 | ||
559 | mutex_lock(&opp_table->lock); | |
560 | ||
561 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
562 | if (temp_opp->available) { | |
563 | if (temp_opp->supplies[0].u_volt > u_volt) | |
564 | break; | |
565 | opp = temp_opp; | |
566 | } | |
567 | } | |
568 | ||
569 | /* Increment the reference count of OPP */ | |
570 | if (!IS_ERR(opp)) | |
571 | dev_pm_opp_get(opp); | |
572 | ||
573 | mutex_unlock(&opp_table->lock); | |
574 | dev_pm_opp_put_opp_table(opp_table); | |
575 | ||
576 | return opp; | |
577 | } | |
578 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt); | |
579 | ||
6a0712f6 | 580 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, |
ce31781a | 581 | struct dev_pm_opp_supply *supply) |
6a0712f6 VK |
582 | { |
583 | int ret; | |
584 | ||
585 | /* Regulator not available for device */ | |
586 | if (IS_ERR(reg)) { | |
587 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
588 | PTR_ERR(reg)); | |
589 | return 0; | |
590 | } | |
591 | ||
ce31781a VK |
592 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, |
593 | supply->u_volt_min, supply->u_volt, supply->u_volt_max); | |
6a0712f6 | 594 | |
ce31781a VK |
595 | ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, |
596 | supply->u_volt, supply->u_volt_max); | |
6a0712f6 VK |
597 | if (ret) |
598 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
ce31781a VK |
599 | __func__, supply->u_volt_min, supply->u_volt, |
600 | supply->u_volt_max, ret); | |
6a0712f6 VK |
601 | |
602 | return ret; | |
603 | } | |
604 | ||
285881b5 VK |
605 | static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk, |
606 | unsigned long freq) | |
94735585 VK |
607 | { |
608 | int ret; | |
609 | ||
610 | ret = clk_set_rate(clk, freq); | |
611 | if (ret) { | |
612 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
613 | ret); | |
614 | } | |
615 | ||
616 | return ret; | |
617 | } | |
618 | ||
c74b32fa VK |
619 | static int _generic_set_opp_regulator(const struct opp_table *opp_table, |
620 | struct device *dev, | |
621 | unsigned long old_freq, | |
622 | unsigned long freq, | |
623 | struct dev_pm_opp_supply *old_supply, | |
624 | struct dev_pm_opp_supply *new_supply) | |
94735585 | 625 | { |
c74b32fa | 626 | struct regulator *reg = opp_table->regulators[0]; |
94735585 VK |
627 | int ret; |
628 | ||
629 | /* This function only supports single regulator per device */ | |
c74b32fa | 630 | if (WARN_ON(opp_table->regulator_count > 1)) { |
94735585 VK |
631 | dev_err(dev, "multiple regulators are not supported\n"); |
632 | return -EINVAL; | |
633 | } | |
634 | ||
635 | /* Scaling up? Scale voltage before frequency */ | |
c5c2a97b | 636 | if (freq >= old_freq) { |
94735585 VK |
637 | ret = _set_opp_voltage(dev, reg, new_supply); |
638 | if (ret) | |
639 | goto restore_voltage; | |
640 | } | |
641 | ||
642 | /* Change frequency */ | |
285881b5 | 643 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq); |
94735585 VK |
644 | if (ret) |
645 | goto restore_voltage; | |
646 | ||
647 | /* Scaling down? Scale voltage after frequency */ | |
648 | if (freq < old_freq) { | |
649 | ret = _set_opp_voltage(dev, reg, new_supply); | |
650 | if (ret) | |
651 | goto restore_freq; | |
652 | } | |
653 | ||
654 | return 0; | |
655 | ||
656 | restore_freq: | |
285881b5 | 657 | if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq)) |
94735585 VK |
658 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
659 | __func__, old_freq); | |
660 | restore_voltage: | |
661 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
c74b32fa | 662 | if (old_supply) |
94735585 VK |
663 | _set_opp_voltage(dev, reg, old_supply); |
664 | ||
665 | return ret; | |
666 | } | |
667 | ||
7e535993 VK |
668 | static int _set_opp_custom(const struct opp_table *opp_table, |
669 | struct device *dev, unsigned long old_freq, | |
670 | unsigned long freq, | |
671 | struct dev_pm_opp_supply *old_supply, | |
672 | struct dev_pm_opp_supply *new_supply) | |
673 | { | |
674 | struct dev_pm_set_opp_data *data; | |
675 | int size; | |
676 | ||
677 | data = opp_table->set_opp_data; | |
678 | data->regulators = opp_table->regulators; | |
679 | data->regulator_count = opp_table->regulator_count; | |
680 | data->clk = opp_table->clk; | |
681 | data->dev = dev; | |
682 | ||
683 | data->old_opp.rate = old_freq; | |
684 | size = sizeof(*old_supply) * opp_table->regulator_count; | |
560d1bca | 685 | if (!old_supply) |
7e535993 VK |
686 | memset(data->old_opp.supplies, 0, size); |
687 | else | |
688 | memcpy(data->old_opp.supplies, old_supply, size); | |
689 | ||
690 | data->new_opp.rate = freq; | |
691 | memcpy(data->new_opp.supplies, new_supply, size); | |
692 | ||
693 | return opp_table->set_opp(data); | |
694 | } | |
695 | ||
ca1b5d77 VK |
696 | /* This is only called for PM domain for now */ |
697 | static int _set_required_opps(struct device *dev, | |
698 | struct opp_table *opp_table, | |
699 | struct dev_pm_opp *opp) | |
700 | { | |
701 | struct opp_table **required_opp_tables = opp_table->required_opp_tables; | |
702 | struct device **genpd_virt_devs = opp_table->genpd_virt_devs; | |
703 | unsigned int pstate; | |
704 | int i, ret = 0; | |
705 | ||
706 | if (!required_opp_tables) | |
707 | return 0; | |
708 | ||
709 | /* Single genpd case */ | |
710 | if (!genpd_virt_devs) { | |
cd7ea582 | 711 | pstate = likely(opp) ? opp->required_opps[0]->pstate : 0; |
ca1b5d77 VK |
712 | ret = dev_pm_genpd_set_performance_state(dev, pstate); |
713 | if (ret) { | |
714 | dev_err(dev, "Failed to set performance state of %s: %d (%d)\n", | |
715 | dev_name(dev), pstate, ret); | |
716 | } | |
717 | return ret; | |
718 | } | |
719 | ||
720 | /* Multiple genpd case */ | |
721 | ||
722 | /* | |
723 | * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev | |
724 | * after it is freed from another thread. | |
725 | */ | |
726 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
727 | ||
728 | for (i = 0; i < opp_table->required_opp_count; i++) { | |
cd7ea582 | 729 | pstate = likely(opp) ? opp->required_opps[i]->pstate : 0; |
ca1b5d77 VK |
730 | |
731 | if (!genpd_virt_devs[i]) | |
732 | continue; | |
733 | ||
734 | ret = dev_pm_genpd_set_performance_state(genpd_virt_devs[i], pstate); | |
735 | if (ret) { | |
736 | dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n", | |
737 | dev_name(genpd_virt_devs[i]), pstate, ret); | |
738 | break; | |
739 | } | |
740 | } | |
741 | mutex_unlock(&opp_table->genpd_virt_dev_lock); | |
742 | ||
743 | return ret; | |
744 | } | |
745 | ||
6a0712f6 VK |
746 | /** |
747 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
748 | * @dev: device for which we do this operation | |
749 | * @target_freq: frequency to achieve | |
750 | * | |
b3e3759e SB |
751 | * This configures the power-supplies to the levels specified by the OPP |
752 | * corresponding to the target_freq, and programs the clock to a value <= | |
753 | * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax | |
754 | * provided by the opp, should have already rounded to the target OPP's | |
755 | * frequency. | |
6a0712f6 VK |
756 | */ |
757 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
758 | { | |
2c2709dc | 759 | struct opp_table *opp_table; |
b3e3759e | 760 | unsigned long freq, old_freq, temp_freq; |
6a0712f6 | 761 | struct dev_pm_opp *old_opp, *opp; |
6a0712f6 | 762 | struct clk *clk; |
7e535993 | 763 | int ret; |
6a0712f6 | 764 | |
052c6f19 VK |
765 | opp_table = _find_opp_table(dev); |
766 | if (IS_ERR(opp_table)) { | |
767 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); | |
768 | return PTR_ERR(opp_table); | |
769 | } | |
770 | ||
cd7ea582 RN |
771 | if (unlikely(!target_freq)) { |
772 | if (opp_table->required_opp_tables) { | |
773 | ret = _set_required_opps(dev, opp_table, NULL); | |
774 | } else { | |
775 | dev_err(dev, "target frequency can't be 0\n"); | |
776 | ret = -EINVAL; | |
777 | } | |
778 | ||
779 | goto put_opp_table; | |
780 | } | |
781 | ||
052c6f19 VK |
782 | clk = opp_table->clk; |
783 | if (IS_ERR(clk)) { | |
784 | dev_err(dev, "%s: No clock available for the device\n", | |
785 | __func__); | |
786 | ret = PTR_ERR(clk); | |
787 | goto put_opp_table; | |
788 | } | |
6a0712f6 VK |
789 | |
790 | freq = clk_round_rate(clk, target_freq); | |
791 | if ((long)freq <= 0) | |
792 | freq = target_freq; | |
793 | ||
794 | old_freq = clk_get_rate(clk); | |
795 | ||
796 | /* Return early if nothing to do */ | |
797 | if (old_freq == freq) { | |
798 | dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", | |
799 | __func__, freq); | |
052c6f19 VK |
800 | ret = 0; |
801 | goto put_opp_table; | |
6a0712f6 VK |
802 | } |
803 | ||
b3e3759e SB |
804 | temp_freq = old_freq; |
805 | old_opp = _find_freq_ceil(opp_table, &temp_freq); | |
4df27c91 | 806 | if (IS_ERR(old_opp)) { |
6a0712f6 VK |
807 | dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", |
808 | __func__, old_freq, PTR_ERR(old_opp)); | |
809 | } | |
810 | ||
b3e3759e SB |
811 | temp_freq = freq; |
812 | opp = _find_freq_ceil(opp_table, &temp_freq); | |
6a0712f6 VK |
813 | if (IS_ERR(opp)) { |
814 | ret = PTR_ERR(opp); | |
815 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
816 | __func__, freq, ret); | |
052c6f19 | 817 | goto put_old_opp; |
6a0712f6 VK |
818 | } |
819 | ||
94735585 VK |
820 | dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, |
821 | old_freq, freq); | |
dfbe4678 | 822 | |
ca1b5d77 | 823 | /* Scaling up? Configure required OPPs before frequency */ |
faef080f | 824 | if (freq >= old_freq) { |
ca1b5d77 VK |
825 | ret = _set_required_opps(dev, opp_table, opp); |
826 | if (ret) | |
827 | goto put_opp; | |
828 | } | |
829 | ||
7e535993 VK |
830 | if (opp_table->set_opp) { |
831 | ret = _set_opp_custom(opp_table, dev, old_freq, freq, | |
832 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
833 | opp->supplies); | |
834 | } else if (opp_table->regulators) { | |
c74b32fa VK |
835 | ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq, |
836 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
837 | opp->supplies); | |
838 | } else { | |
7e535993 | 839 | /* Only frequency scaling */ |
285881b5 | 840 | ret = _generic_set_opp_clk_only(dev, clk, freq); |
ca1b5d77 | 841 | } |
c74b32fa | 842 | |
ca1b5d77 VK |
843 | /* Scaling down? Configure required OPPs after frequency */ |
844 | if (!ret && freq < old_freq) { | |
845 | ret = _set_required_opps(dev, opp_table, opp); | |
846 | if (ret) | |
847 | dev_err(dev, "Failed to set required opps: %d\n", ret); | |
dfbe4678 VK |
848 | } |
849 | ||
ca1b5d77 | 850 | put_opp: |
8a31d9d9 | 851 | dev_pm_opp_put(opp); |
052c6f19 | 852 | put_old_opp: |
8a31d9d9 VK |
853 | if (!IS_ERR(old_opp)) |
854 | dev_pm_opp_put(old_opp); | |
052c6f19 | 855 | put_opp_table: |
5b650b38 | 856 | dev_pm_opp_put_opp_table(opp_table); |
052c6f19 | 857 | return ret; |
6a0712f6 VK |
858 | } |
859 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
860 | ||
2c2709dc | 861 | /* OPP-dev Helpers */ |
2c2709dc VK |
862 | static void _remove_opp_dev(struct opp_device *opp_dev, |
863 | struct opp_table *opp_table) | |
06441658 | 864 | { |
2c2709dc VK |
865 | opp_debug_unregister(opp_dev, opp_table); |
866 | list_del(&opp_dev->node); | |
052c6f19 | 867 | kfree(opp_dev); |
06441658 VK |
868 | } |
869 | ||
283d55e6 VK |
870 | static struct opp_device *_add_opp_dev_unlocked(const struct device *dev, |
871 | struct opp_table *opp_table) | |
06441658 | 872 | { |
2c2709dc | 873 | struct opp_device *opp_dev; |
06441658 | 874 | |
2c2709dc VK |
875 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
876 | if (!opp_dev) | |
06441658 VK |
877 | return NULL; |
878 | ||
2c2709dc VK |
879 | /* Initialize opp-dev */ |
880 | opp_dev->dev = dev; | |
3d255699 | 881 | |
052c6f19 | 882 | list_add(&opp_dev->node, &opp_table->dev_list); |
06441658 | 883 | |
2c2709dc | 884 | /* Create debugfs entries for the opp_table */ |
a2dea4cb | 885 | opp_debug_register(opp_dev, opp_table); |
283d55e6 VK |
886 | |
887 | return opp_dev; | |
888 | } | |
889 | ||
890 | struct opp_device *_add_opp_dev(const struct device *dev, | |
891 | struct opp_table *opp_table) | |
892 | { | |
893 | struct opp_device *opp_dev; | |
894 | ||
895 | mutex_lock(&opp_table->lock); | |
896 | opp_dev = _add_opp_dev_unlocked(dev, opp_table); | |
3d255699 | 897 | mutex_unlock(&opp_table->lock); |
deaa5146 | 898 | |
2c2709dc | 899 | return opp_dev; |
06441658 VK |
900 | } |
901 | ||
eb7c8743 | 902 | static struct opp_table *_allocate_opp_table(struct device *dev, int index) |
07cce74a | 903 | { |
2c2709dc VK |
904 | struct opp_table *opp_table; |
905 | struct opp_device *opp_dev; | |
d54974c2 | 906 | int ret; |
07cce74a VK |
907 | |
908 | /* | |
2c2709dc | 909 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
910 | * device is needed to be added, we pay this penalty. |
911 | */ | |
2c2709dc VK |
912 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
913 | if (!opp_table) | |
07cce74a VK |
914 | return NULL; |
915 | ||
3d255699 | 916 | mutex_init(&opp_table->lock); |
4f018bc0 | 917 | mutex_init(&opp_table->genpd_virt_dev_lock); |
2c2709dc | 918 | INIT_LIST_HEAD(&opp_table->dev_list); |
06441658 | 919 | |
46f48aca VK |
920 | /* Mark regulator count uninitialized */ |
921 | opp_table->regulator_count = -1; | |
922 | ||
2c2709dc VK |
923 | opp_dev = _add_opp_dev(dev, opp_table); |
924 | if (!opp_dev) { | |
925 | kfree(opp_table); | |
06441658 VK |
926 | return NULL; |
927 | } | |
928 | ||
eb7c8743 | 929 | _of_init_opp_table(opp_table, dev, index); |
50f8cfbd | 930 | |
d54974c2 | 931 | /* Find clk for the device */ |
2c2709dc VK |
932 | opp_table->clk = clk_get(dev, NULL); |
933 | if (IS_ERR(opp_table->clk)) { | |
934 | ret = PTR_ERR(opp_table->clk); | |
d54974c2 VK |
935 | if (ret != -EPROBE_DEFER) |
936 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, | |
937 | ret); | |
938 | } | |
939 | ||
052c6f19 | 940 | BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head); |
2c2709dc | 941 | INIT_LIST_HEAD(&opp_table->opp_list); |
f067a982 | 942 | kref_init(&opp_table->kref); |
07cce74a | 943 | |
2c2709dc | 944 | /* Secure the device table modification */ |
052c6f19 | 945 | list_add(&opp_table->node, &opp_tables); |
2c2709dc | 946 | return opp_table; |
07cce74a VK |
947 | } |
948 | ||
f067a982 | 949 | void _get_opp_table_kref(struct opp_table *opp_table) |
b6160e26 | 950 | { |
f067a982 VK |
951 | kref_get(&opp_table->kref); |
952 | } | |
953 | ||
eb7c8743 | 954 | static struct opp_table *_opp_get_opp_table(struct device *dev, int index) |
f067a982 VK |
955 | { |
956 | struct opp_table *opp_table; | |
957 | ||
958 | /* Hold our table modification lock here */ | |
959 | mutex_lock(&opp_table_lock); | |
960 | ||
5b650b38 VK |
961 | opp_table = _find_opp_table_unlocked(dev); |
962 | if (!IS_ERR(opp_table)) | |
f067a982 | 963 | goto unlock; |
f067a982 | 964 | |
283d55e6 VK |
965 | opp_table = _managed_opp(dev, index); |
966 | if (opp_table) { | |
967 | if (!_add_opp_dev_unlocked(dev, opp_table)) { | |
968 | dev_pm_opp_put_opp_table(opp_table); | |
969 | opp_table = NULL; | |
970 | } | |
971 | goto unlock; | |
972 | } | |
973 | ||
eb7c8743 | 974 | opp_table = _allocate_opp_table(dev, index); |
f067a982 VK |
975 | |
976 | unlock: | |
977 | mutex_unlock(&opp_table_lock); | |
978 | ||
979 | return opp_table; | |
980 | } | |
eb7c8743 VK |
981 | |
982 | struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) | |
983 | { | |
984 | return _opp_get_opp_table(dev, 0); | |
985 | } | |
f067a982 VK |
986 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); |
987 | ||
eb7c8743 VK |
988 | struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, |
989 | int index) | |
990 | { | |
991 | return _opp_get_opp_table(dev, index); | |
992 | } | |
993 | ||
b83c1899 | 994 | static void _opp_table_kref_release(struct kref *kref) |
f067a982 VK |
995 | { |
996 | struct opp_table *opp_table = container_of(kref, struct opp_table, kref); | |
cdd6ed90 | 997 | struct opp_device *opp_dev, *temp; |
b6160e26 | 998 | |
5d6d106f VK |
999 | _of_clear_opp_table(opp_table); |
1000 | ||
b6160e26 VK |
1001 | /* Release clk */ |
1002 | if (!IS_ERR(opp_table->clk)) | |
1003 | clk_put(opp_table->clk); | |
1004 | ||
cdd6ed90 | 1005 | WARN_ON(!list_empty(&opp_table->opp_list)); |
b6160e26 | 1006 | |
cdd6ed90 VK |
1007 | list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) { |
1008 | /* | |
1009 | * The OPP table is getting removed, drop the performance state | |
1010 | * constraints. | |
1011 | */ | |
1012 | if (opp_table->genpd_performance_state) | |
1013 | dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0); | |
b6160e26 | 1014 | |
cdd6ed90 VK |
1015 | _remove_opp_dev(opp_dev, opp_table); |
1016 | } | |
b6160e26 | 1017 | |
4f018bc0 | 1018 | mutex_destroy(&opp_table->genpd_virt_dev_lock); |
37a73ec0 | 1019 | mutex_destroy(&opp_table->lock); |
052c6f19 VK |
1020 | list_del(&opp_table->node); |
1021 | kfree(opp_table); | |
b6160e26 | 1022 | |
f067a982 VK |
1023 | mutex_unlock(&opp_table_lock); |
1024 | } | |
1025 | ||
d0e8ae6c VK |
1026 | void _opp_remove_all_static(struct opp_table *opp_table) |
1027 | { | |
1028 | struct dev_pm_opp *opp, *tmp; | |
1029 | ||
1030 | list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { | |
1031 | if (!opp->dynamic) | |
1032 | dev_pm_opp_put(opp); | |
1033 | } | |
1034 | ||
1035 | opp_table->parsed_static_opps = false; | |
1036 | } | |
1037 | ||
1038 | static void _opp_table_list_kref_release(struct kref *kref) | |
1039 | { | |
1040 | struct opp_table *opp_table = container_of(kref, struct opp_table, | |
1041 | list_kref); | |
1042 | ||
1043 | _opp_remove_all_static(opp_table); | |
1044 | mutex_unlock(&opp_table_lock); | |
1045 | } | |
1046 | ||
1047 | void _put_opp_list_kref(struct opp_table *opp_table) | |
1048 | { | |
1049 | kref_put_mutex(&opp_table->list_kref, _opp_table_list_kref_release, | |
1050 | &opp_table_lock); | |
1051 | } | |
1052 | ||
f067a982 VK |
1053 | void dev_pm_opp_put_opp_table(struct opp_table *opp_table) |
1054 | { | |
1055 | kref_put_mutex(&opp_table->kref, _opp_table_kref_release, | |
1056 | &opp_table_lock); | |
1057 | } | |
1058 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table); | |
1059 | ||
8cd2f6e8 | 1060 | void _opp_free(struct dev_pm_opp *opp) |
969fceb3 VK |
1061 | { |
1062 | kfree(opp); | |
969fceb3 VK |
1063 | } |
1064 | ||
1690d8bb VK |
1065 | static void _opp_kref_release(struct dev_pm_opp *opp, |
1066 | struct opp_table *opp_table) | |
129eec55 VK |
1067 | { |
1068 | /* | |
1069 | * Notify the changes in the availability of the operable | |
1070 | * frequency/voltage list. | |
1071 | */ | |
052c6f19 | 1072 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); |
da544b61 | 1073 | _of_opp_free_required_opps(opp_table, opp); |
deaa5146 | 1074 | opp_debug_remove_one(opp); |
052c6f19 VK |
1075 | list_del(&opp->node); |
1076 | kfree(opp); | |
1690d8bb | 1077 | } |
129eec55 | 1078 | |
1690d8bb VK |
1079 | static void _opp_kref_release_unlocked(struct kref *kref) |
1080 | { | |
1081 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); | |
1082 | struct opp_table *opp_table = opp->opp_table; | |
1083 | ||
1084 | _opp_kref_release(opp, opp_table); | |
1085 | } | |
1086 | ||
1087 | static void _opp_kref_release_locked(struct kref *kref) | |
1088 | { | |
1089 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); | |
1090 | struct opp_table *opp_table = opp->opp_table; | |
1091 | ||
1092 | _opp_kref_release(opp, opp_table); | |
37a73ec0 | 1093 | mutex_unlock(&opp_table->lock); |
129eec55 VK |
1094 | } |
1095 | ||
a88bd2a5 | 1096 | void dev_pm_opp_get(struct dev_pm_opp *opp) |
8a31d9d9 VK |
1097 | { |
1098 | kref_get(&opp->kref); | |
1099 | } | |
1100 | ||
7034764a VK |
1101 | void dev_pm_opp_put(struct dev_pm_opp *opp) |
1102 | { | |
1690d8bb VK |
1103 | kref_put_mutex(&opp->kref, _opp_kref_release_locked, |
1104 | &opp->opp_table->lock); | |
7034764a VK |
1105 | } |
1106 | EXPORT_SYMBOL_GPL(dev_pm_opp_put); | |
1107 | ||
1690d8bb VK |
1108 | static void dev_pm_opp_put_unlocked(struct dev_pm_opp *opp) |
1109 | { | |
1110 | kref_put(&opp->kref, _opp_kref_release_unlocked); | |
1111 | } | |
1112 | ||
129eec55 | 1113 | /** |
2c2709dc | 1114 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
1115 | * @dev: device for which we do this operation |
1116 | * @freq: OPP to remove with matching 'freq' | |
1117 | * | |
2c2709dc | 1118 | * This function removes an opp from the opp table. |
129eec55 VK |
1119 | */ |
1120 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
1121 | { | |
1122 | struct dev_pm_opp *opp; | |
2c2709dc | 1123 | struct opp_table *opp_table; |
129eec55 VK |
1124 | bool found = false; |
1125 | ||
2c2709dc VK |
1126 | opp_table = _find_opp_table(dev); |
1127 | if (IS_ERR(opp_table)) | |
5b650b38 | 1128 | return; |
129eec55 | 1129 | |
37a73ec0 VK |
1130 | mutex_lock(&opp_table->lock); |
1131 | ||
2c2709dc | 1132 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
1133 | if (opp->rate == freq) { |
1134 | found = true; | |
1135 | break; | |
1136 | } | |
1137 | } | |
1138 | ||
37a73ec0 VK |
1139 | mutex_unlock(&opp_table->lock); |
1140 | ||
5b650b38 VK |
1141 | if (found) { |
1142 | dev_pm_opp_put(opp); | |
0ad8c623 VK |
1143 | |
1144 | /* Drop the reference taken by dev_pm_opp_add() */ | |
1145 | dev_pm_opp_put_opp_table(opp_table); | |
5b650b38 | 1146 | } else { |
129eec55 VK |
1147 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", |
1148 | __func__, freq); | |
129eec55 VK |
1149 | } |
1150 | ||
0ad8c623 | 1151 | /* Drop the reference taken by _find_opp_table() */ |
5b650b38 | 1152 | dev_pm_opp_put_opp_table(opp_table); |
129eec55 VK |
1153 | } |
1154 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
1155 | ||
1690d8bb VK |
1156 | /** |
1157 | * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs | |
1158 | * @dev: device for which we do this operation | |
1159 | * | |
1160 | * This function removes all dynamically created OPPs from the opp table. | |
1161 | */ | |
1162 | void dev_pm_opp_remove_all_dynamic(struct device *dev) | |
1163 | { | |
1164 | struct opp_table *opp_table; | |
1165 | struct dev_pm_opp *opp, *temp; | |
1166 | int count = 0; | |
1167 | ||
1168 | opp_table = _find_opp_table(dev); | |
1169 | if (IS_ERR(opp_table)) | |
1170 | return; | |
1171 | ||
1172 | mutex_lock(&opp_table->lock); | |
1173 | list_for_each_entry_safe(opp, temp, &opp_table->opp_list, node) { | |
1174 | if (opp->dynamic) { | |
1175 | dev_pm_opp_put_unlocked(opp); | |
1176 | count++; | |
1177 | } | |
1178 | } | |
1179 | mutex_unlock(&opp_table->lock); | |
1180 | ||
1181 | /* Drop the references taken by dev_pm_opp_add() */ | |
1182 | while (count--) | |
1183 | dev_pm_opp_put_opp_table(opp_table); | |
1184 | ||
1185 | /* Drop the reference taken by _find_opp_table() */ | |
1186 | dev_pm_opp_put_opp_table(opp_table); | |
1187 | } | |
1188 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic); | |
1189 | ||
8cd2f6e8 | 1190 | struct dev_pm_opp *_opp_allocate(struct opp_table *table) |
e1f60b29 | 1191 | { |
23dacf6d | 1192 | struct dev_pm_opp *opp; |
dfbe4678 | 1193 | int count, supply_size; |
e1f60b29 | 1194 | |
dfbe4678 | 1195 | /* Allocate space for at least one supply */ |
46f48aca | 1196 | count = table->regulator_count > 0 ? table->regulator_count : 1; |
dfbe4678 | 1197 | supply_size = sizeof(*opp->supplies) * count; |
e1f60b29 | 1198 | |
dfbe4678 VK |
1199 | /* allocate new OPP node and supplies structures */ |
1200 | opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL); | |
8cd2f6e8 | 1201 | if (!opp) |
23dacf6d | 1202 | return NULL; |
23dacf6d | 1203 | |
dfbe4678 VK |
1204 | /* Put the supplies at the end of the OPP structure as an empty array */ |
1205 | opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); | |
1206 | INIT_LIST_HEAD(&opp->node); | |
1207 | ||
23dacf6d VK |
1208 | return opp; |
1209 | } | |
1210 | ||
7d34d56e | 1211 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 1212 | struct opp_table *opp_table) |
7d34d56e | 1213 | { |
dfbe4678 VK |
1214 | struct regulator *reg; |
1215 | int i; | |
1216 | ||
90e3577b VK |
1217 | if (!opp_table->regulators) |
1218 | return true; | |
1219 | ||
dfbe4678 VK |
1220 | for (i = 0; i < opp_table->regulator_count; i++) { |
1221 | reg = opp_table->regulators[i]; | |
1222 | ||
1223 | if (!regulator_is_supported_voltage(reg, | |
1224 | opp->supplies[i].u_volt_min, | |
1225 | opp->supplies[i].u_volt_max)) { | |
1226 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
1227 | __func__, opp->supplies[i].u_volt_min, | |
1228 | opp->supplies[i].u_volt_max); | |
1229 | return false; | |
1230 | } | |
7d34d56e VK |
1231 | } |
1232 | ||
1233 | return true; | |
1234 | } | |
1235 | ||
a1e8c136 VK |
1236 | static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp, |
1237 | struct opp_table *opp_table, | |
1238 | struct list_head **head) | |
23dacf6d VK |
1239 | { |
1240 | struct dev_pm_opp *opp; | |
23dacf6d VK |
1241 | |
1242 | /* | |
1243 | * Insert new OPP in order of increasing frequency and discard if | |
1244 | * already present. | |
1245 | * | |
2c2709dc | 1246 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
1247 | * loop, don't replace it with head otherwise it will become an infinite |
1248 | * loop. | |
1249 | */ | |
052c6f19 | 1250 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
23dacf6d | 1251 | if (new_opp->rate > opp->rate) { |
a1e8c136 | 1252 | *head = &opp->node; |
23dacf6d VK |
1253 | continue; |
1254 | } | |
1255 | ||
1256 | if (new_opp->rate < opp->rate) | |
a1e8c136 | 1257 | return 0; |
23dacf6d VK |
1258 | |
1259 | /* Duplicate OPPs */ | |
06441658 | 1260 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
dfbe4678 VK |
1261 | __func__, opp->rate, opp->supplies[0].u_volt, |
1262 | opp->available, new_opp->rate, | |
1263 | new_opp->supplies[0].u_volt, new_opp->available); | |
23dacf6d | 1264 | |
dfbe4678 | 1265 | /* Should we compare voltages for all regulators here ? */ |
a1e8c136 VK |
1266 | return opp->available && |
1267 | new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST; | |
1268 | } | |
1269 | ||
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Returns: | |
1275 | * 0: On success. And appropriate error message for duplicate OPPs. | |
1276 | * -EBUSY: For OPP with same freq/volt and is available. The callers of | |
1277 | * _opp_add() must return 0 if they receive -EBUSY from it. This is to make | |
1278 | * sure we don't print error messages unnecessarily if different parts of | |
1279 | * kernel try to initialize the OPP table. | |
1280 | * -EEXIST: For OPP with same freq but different volt or is unavailable. This | |
1281 | * should be considered an error by the callers of _opp_add(). | |
1282 | */ | |
1283 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, | |
1284 | struct opp_table *opp_table, bool rate_not_available) | |
1285 | { | |
1286 | struct list_head *head; | |
1287 | int ret; | |
1288 | ||
1289 | mutex_lock(&opp_table->lock); | |
1290 | head = &opp_table->opp_list; | |
37a73ec0 | 1291 | |
a1e8c136 VK |
1292 | if (likely(!rate_not_available)) { |
1293 | ret = _opp_is_duplicate(dev, new_opp, opp_table, &head); | |
1294 | if (ret) { | |
1295 | mutex_unlock(&opp_table->lock); | |
1296 | return ret; | |
1297 | } | |
23dacf6d VK |
1298 | } |
1299 | ||
052c6f19 | 1300 | list_add(&new_opp->node, head); |
37a73ec0 VK |
1301 | mutex_unlock(&opp_table->lock); |
1302 | ||
1303 | new_opp->opp_table = opp_table; | |
7034764a | 1304 | kref_init(&new_opp->kref); |
23dacf6d | 1305 | |
a2dea4cb | 1306 | opp_debug_create_one(new_opp, opp_table); |
deaa5146 | 1307 | |
2c2709dc | 1308 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1309 | new_opp->available = false; |
1310 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1311 | __func__, new_opp->rate); | |
1312 | } | |
1313 | ||
23dacf6d VK |
1314 | return 0; |
1315 | } | |
1316 | ||
984f16c8 | 1317 | /** |
b64b9c3f | 1318 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
8cd2f6e8 | 1319 | * @opp_table: OPP table |
984f16c8 NM |
1320 | * @dev: device for which we do this operation |
1321 | * @freq: Frequency in Hz for this OPP | |
1322 | * @u_volt: Voltage in uVolts for this OPP | |
1323 | * @dynamic: Dynamically added OPPs. | |
1324 | * | |
2c2709dc | 1325 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1326 | * The opp is made available by default and it can be controlled using |
1327 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1328 | * | |
8f8d37b2 VK |
1329 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1330 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1331 | * |
984f16c8 NM |
1332 | * Return: |
1333 | * 0 On success OR | |
1334 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1335 | * -EEXIST Freq are same and volt are different OR | |
1336 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1337 | * -ENOMEM Memory allocation failure | |
1338 | */ | |
8cd2f6e8 VK |
1339 | int _opp_add_v1(struct opp_table *opp_table, struct device *dev, |
1340 | unsigned long freq, long u_volt, bool dynamic) | |
e1f60b29 | 1341 | { |
23dacf6d | 1342 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1343 | unsigned long tol; |
6ce4184d | 1344 | int ret; |
e1f60b29 | 1345 | |
8cd2f6e8 VK |
1346 | new_opp = _opp_allocate(opp_table); |
1347 | if (!new_opp) | |
1348 | return -ENOMEM; | |
23dacf6d | 1349 | |
a7470db6 | 1350 | /* populate the opp table */ |
a7470db6 | 1351 | new_opp->rate = freq; |
2c2709dc | 1352 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
dfbe4678 VK |
1353 | new_opp->supplies[0].u_volt = u_volt; |
1354 | new_opp->supplies[0].u_volt_min = u_volt - tol; | |
1355 | new_opp->supplies[0].u_volt_max = u_volt + tol; | |
a7470db6 | 1356 | new_opp->available = true; |
23dacf6d | 1357 | new_opp->dynamic = dynamic; |
a7470db6 | 1358 | |
a1e8c136 | 1359 | ret = _opp_add(dev, new_opp, opp_table, false); |
7f8538eb VK |
1360 | if (ret) { |
1361 | /* Don't return error for duplicate OPPs */ | |
1362 | if (ret == -EBUSY) | |
1363 | ret = 0; | |
6ce4184d | 1364 | goto free_opp; |
7f8538eb | 1365 | } |
64ce8545 | 1366 | |
03ca370f MH |
1367 | /* |
1368 | * Notify the changes in the availability of the operable | |
1369 | * frequency/voltage list. | |
1370 | */ | |
052c6f19 | 1371 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1372 | return 0; |
6ce4184d VK |
1373 | |
1374 | free_opp: | |
8cd2f6e8 VK |
1375 | _opp_free(new_opp); |
1376 | ||
6ce4184d | 1377 | return ret; |
e1f60b29 | 1378 | } |
38393409 | 1379 | |
7de36b0a VK |
1380 | /** |
1381 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1382 | * @dev: Device for which supported-hw has to be set. | |
1383 | * @versions: Array of hierarchy of versions to match. | |
1384 | * @count: Number of elements in the array. | |
1385 | * | |
1386 | * This is required only for the V2 bindings, and it enables a platform to | |
1387 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1388 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1389 | * property. | |
7de36b0a | 1390 | */ |
fa30184d VK |
1391 | struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, |
1392 | const u32 *versions, unsigned int count) | |
7de36b0a | 1393 | { |
2c2709dc | 1394 | struct opp_table *opp_table; |
7de36b0a | 1395 | |
fa30184d VK |
1396 | opp_table = dev_pm_opp_get_opp_table(dev); |
1397 | if (!opp_table) | |
1398 | return ERR_PTR(-ENOMEM); | |
7de36b0a | 1399 | |
2c2709dc VK |
1400 | /* Make sure there are no concurrent readers while updating opp_table */ |
1401 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1402 | |
25419de1 VK |
1403 | /* Another CPU that shares the OPP table has set the property ? */ |
1404 | if (opp_table->supported_hw) | |
1405 | return opp_table; | |
7de36b0a | 1406 | |
2c2709dc | 1407 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1408 | GFP_KERNEL); |
2c2709dc | 1409 | if (!opp_table->supported_hw) { |
25419de1 VK |
1410 | dev_pm_opp_put_opp_table(opp_table); |
1411 | return ERR_PTR(-ENOMEM); | |
7de36b0a VK |
1412 | } |
1413 | ||
2c2709dc | 1414 | opp_table->supported_hw_count = count; |
fa30184d VK |
1415 | |
1416 | return opp_table; | |
7de36b0a VK |
1417 | } |
1418 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1419 | ||
1420 | /** | |
1421 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
fa30184d | 1422 | * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw(). |
7de36b0a VK |
1423 | * |
1424 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1425 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a | 1426 | * will not be freed. |
7de36b0a | 1427 | */ |
fa30184d | 1428 | void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) |
7de36b0a | 1429 | { |
2c2709dc VK |
1430 | /* Make sure there are no concurrent readers while updating opp_table */ |
1431 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1432 | |
2c2709dc VK |
1433 | kfree(opp_table->supported_hw); |
1434 | opp_table->supported_hw = NULL; | |
1435 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1436 | |
fa30184d | 1437 | dev_pm_opp_put_opp_table(opp_table); |
7de36b0a VK |
1438 | } |
1439 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1440 | ||
01fb4d3c VK |
1441 | /** |
1442 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1443 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1444 | * @name: name to postfix to properties. |
1445 | * | |
1446 | * This is required only for the V2 bindings, and it enables a platform to | |
1447 | * specify the extn to be used for certain property names. The properties to | |
1448 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1449 | * should postfix the property name with -<name> while looking for them. | |
01fb4d3c | 1450 | */ |
fa30184d | 1451 | struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) |
01fb4d3c | 1452 | { |
2c2709dc | 1453 | struct opp_table *opp_table; |
01fb4d3c | 1454 | |
fa30184d VK |
1455 | opp_table = dev_pm_opp_get_opp_table(dev); |
1456 | if (!opp_table) | |
1457 | return ERR_PTR(-ENOMEM); | |
01fb4d3c | 1458 | |
2c2709dc VK |
1459 | /* Make sure there are no concurrent readers while updating opp_table */ |
1460 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1461 | |
878ec1a9 VK |
1462 | /* Another CPU that shares the OPP table has set the property ? */ |
1463 | if (opp_table->prop_name) | |
1464 | return opp_table; | |
01fb4d3c | 1465 | |
2c2709dc VK |
1466 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1467 | if (!opp_table->prop_name) { | |
878ec1a9 VK |
1468 | dev_pm_opp_put_opp_table(opp_table); |
1469 | return ERR_PTR(-ENOMEM); | |
01fb4d3c VK |
1470 | } |
1471 | ||
fa30184d | 1472 | return opp_table; |
01fb4d3c VK |
1473 | } |
1474 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1475 | ||
1476 | /** | |
1477 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
fa30184d | 1478 | * @opp_table: OPP table returned by dev_pm_opp_set_prop_name(). |
01fb4d3c VK |
1479 | * |
1480 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1481 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c | 1482 | * will not be freed. |
01fb4d3c | 1483 | */ |
fa30184d | 1484 | void dev_pm_opp_put_prop_name(struct opp_table *opp_table) |
01fb4d3c | 1485 | { |
2c2709dc VK |
1486 | /* Make sure there are no concurrent readers while updating opp_table */ |
1487 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1488 | |
2c2709dc VK |
1489 | kfree(opp_table->prop_name); |
1490 | opp_table->prop_name = NULL; | |
01fb4d3c | 1491 | |
fa30184d | 1492 | dev_pm_opp_put_opp_table(opp_table); |
01fb4d3c VK |
1493 | } |
1494 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1495 | ||
94735585 VK |
1496 | static int _allocate_set_opp_data(struct opp_table *opp_table) |
1497 | { | |
1498 | struct dev_pm_set_opp_data *data; | |
1499 | int len, count = opp_table->regulator_count; | |
1500 | ||
90e3577b | 1501 | if (WARN_ON(!opp_table->regulators)) |
94735585 VK |
1502 | return -EINVAL; |
1503 | ||
1504 | /* space for set_opp_data */ | |
1505 | len = sizeof(*data); | |
1506 | ||
1507 | /* space for old_opp.supplies and new_opp.supplies */ | |
1508 | len += 2 * sizeof(struct dev_pm_opp_supply) * count; | |
1509 | ||
1510 | data = kzalloc(len, GFP_KERNEL); | |
1511 | if (!data) | |
1512 | return -ENOMEM; | |
1513 | ||
1514 | data->old_opp.supplies = (void *)(data + 1); | |
1515 | data->new_opp.supplies = data->old_opp.supplies + count; | |
1516 | ||
1517 | opp_table->set_opp_data = data; | |
1518 | ||
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | static void _free_set_opp_data(struct opp_table *opp_table) | |
1523 | { | |
1524 | kfree(opp_table->set_opp_data); | |
1525 | opp_table->set_opp_data = NULL; | |
1526 | } | |
1527 | ||
9f8ea969 | 1528 | /** |
dfbe4678 | 1529 | * dev_pm_opp_set_regulators() - Set regulator names for the device |
9f8ea969 | 1530 | * @dev: Device for which regulator name is being set. |
dfbe4678 VK |
1531 | * @names: Array of pointers to the names of the regulator. |
1532 | * @count: Number of regulators. | |
9f8ea969 VK |
1533 | * |
1534 | * In order to support OPP switching, OPP layer needs to know the name of the | |
dfbe4678 VK |
1535 | * device's regulators, as the core would be required to switch voltages as |
1536 | * well. | |
9f8ea969 VK |
1537 | * |
1538 | * This must be called before any OPPs are initialized for the device. | |
9f8ea969 | 1539 | */ |
dfbe4678 VK |
1540 | struct opp_table *dev_pm_opp_set_regulators(struct device *dev, |
1541 | const char * const names[], | |
1542 | unsigned int count) | |
9f8ea969 | 1543 | { |
2c2709dc | 1544 | struct opp_table *opp_table; |
9f8ea969 | 1545 | struct regulator *reg; |
dfbe4678 | 1546 | int ret, i; |
9f8ea969 | 1547 | |
fa30184d VK |
1548 | opp_table = dev_pm_opp_get_opp_table(dev); |
1549 | if (!opp_table) | |
1550 | return ERR_PTR(-ENOMEM); | |
9f8ea969 VK |
1551 | |
1552 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1553 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1554 | ret = -EBUSY; |
1555 | goto err; | |
1556 | } | |
1557 | ||
779b783c VK |
1558 | /* Another CPU that shares the OPP table has set the regulators ? */ |
1559 | if (opp_table->regulators) | |
1560 | return opp_table; | |
dfbe4678 VK |
1561 | |
1562 | opp_table->regulators = kmalloc_array(count, | |
1563 | sizeof(*opp_table->regulators), | |
1564 | GFP_KERNEL); | |
1565 | if (!opp_table->regulators) { | |
1566 | ret = -ENOMEM; | |
9f8ea969 VK |
1567 | goto err; |
1568 | } | |
1569 | ||
dfbe4678 VK |
1570 | for (i = 0; i < count; i++) { |
1571 | reg = regulator_get_optional(dev, names[i]); | |
1572 | if (IS_ERR(reg)) { | |
1573 | ret = PTR_ERR(reg); | |
1574 | if (ret != -EPROBE_DEFER) | |
1575 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
1576 | __func__, names[i], ret); | |
1577 | goto free_regulators; | |
1578 | } | |
1579 | ||
1580 | opp_table->regulators[i] = reg; | |
1581 | } | |
1582 | ||
1583 | opp_table->regulator_count = count; | |
9f8ea969 | 1584 | |
94735585 VK |
1585 | /* Allocate block only once to pass to set_opp() routines */ |
1586 | ret = _allocate_set_opp_data(opp_table); | |
1587 | if (ret) | |
1588 | goto free_regulators; | |
1589 | ||
91291d9a | 1590 | return opp_table; |
9f8ea969 | 1591 | |
dfbe4678 VK |
1592 | free_regulators: |
1593 | while (i != 0) | |
1594 | regulator_put(opp_table->regulators[--i]); | |
1595 | ||
1596 | kfree(opp_table->regulators); | |
1597 | opp_table->regulators = NULL; | |
46f48aca | 1598 | opp_table->regulator_count = -1; |
9f8ea969 | 1599 | err: |
fa30184d | 1600 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1601 | |
91291d9a | 1602 | return ERR_PTR(ret); |
9f8ea969 | 1603 | } |
dfbe4678 | 1604 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); |
9f8ea969 VK |
1605 | |
1606 | /** | |
dfbe4678 VK |
1607 | * dev_pm_opp_put_regulators() - Releases resources blocked for regulator |
1608 | * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). | |
9f8ea969 | 1609 | */ |
dfbe4678 | 1610 | void dev_pm_opp_put_regulators(struct opp_table *opp_table) |
9f8ea969 | 1611 | { |
dfbe4678 VK |
1612 | int i; |
1613 | ||
779b783c VK |
1614 | if (!opp_table->regulators) |
1615 | goto put_opp_table; | |
9f8ea969 | 1616 | |
2c2709dc VK |
1617 | /* Make sure there are no concurrent readers while updating opp_table */ |
1618 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
9f8ea969 | 1619 | |
dfbe4678 VK |
1620 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
1621 | regulator_put(opp_table->regulators[i]); | |
1622 | ||
94735585 VK |
1623 | _free_set_opp_data(opp_table); |
1624 | ||
dfbe4678 VK |
1625 | kfree(opp_table->regulators); |
1626 | opp_table->regulators = NULL; | |
46f48aca | 1627 | opp_table->regulator_count = -1; |
9f8ea969 | 1628 | |
779b783c | 1629 | put_opp_table: |
fa30184d | 1630 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1631 | } |
dfbe4678 | 1632 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); |
9f8ea969 | 1633 | |
829a4e8c VK |
1634 | /** |
1635 | * dev_pm_opp_set_clkname() - Set clk name for the device | |
1636 | * @dev: Device for which clk name is being set. | |
1637 | * @name: Clk name. | |
1638 | * | |
1639 | * In order to support OPP switching, OPP layer needs to get pointer to the | |
1640 | * clock for the device. Simple cases work fine without using this routine (i.e. | |
1641 | * by passing connection-id as NULL), but for a device with multiple clocks | |
1642 | * available, the OPP core needs to know the exact name of the clk to use. | |
1643 | * | |
1644 | * This must be called before any OPPs are initialized for the device. | |
1645 | */ | |
1646 | struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name) | |
1647 | { | |
1648 | struct opp_table *opp_table; | |
1649 | int ret; | |
1650 | ||
1651 | opp_table = dev_pm_opp_get_opp_table(dev); | |
1652 | if (!opp_table) | |
1653 | return ERR_PTR(-ENOMEM); | |
1654 | ||
1655 | /* This should be called before OPPs are initialized */ | |
1656 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
1657 | ret = -EBUSY; | |
1658 | goto err; | |
1659 | } | |
1660 | ||
1661 | /* Already have default clk set, free it */ | |
1662 | if (!IS_ERR(opp_table->clk)) | |
1663 | clk_put(opp_table->clk); | |
1664 | ||
1665 | /* Find clk for the device */ | |
1666 | opp_table->clk = clk_get(dev, name); | |
1667 | if (IS_ERR(opp_table->clk)) { | |
1668 | ret = PTR_ERR(opp_table->clk); | |
1669 | if (ret != -EPROBE_DEFER) { | |
1670 | dev_err(dev, "%s: Couldn't find clock: %d\n", __func__, | |
1671 | ret); | |
1672 | } | |
1673 | goto err; | |
1674 | } | |
1675 | ||
1676 | return opp_table; | |
1677 | ||
1678 | err: | |
1679 | dev_pm_opp_put_opp_table(opp_table); | |
1680 | ||
1681 | return ERR_PTR(ret); | |
1682 | } | |
1683 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname); | |
1684 | ||
1685 | /** | |
1686 | * dev_pm_opp_put_clkname() - Releases resources blocked for clk. | |
1687 | * @opp_table: OPP table returned from dev_pm_opp_set_clkname(). | |
1688 | */ | |
1689 | void dev_pm_opp_put_clkname(struct opp_table *opp_table) | |
1690 | { | |
1691 | /* Make sure there are no concurrent readers while updating opp_table */ | |
1692 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1693 | ||
1694 | clk_put(opp_table->clk); | |
1695 | opp_table->clk = ERR_PTR(-EINVAL); | |
1696 | ||
1697 | dev_pm_opp_put_opp_table(opp_table); | |
1698 | } | |
1699 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname); | |
1700 | ||
4dab160e VK |
1701 | /** |
1702 | * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
1703 | * @dev: Device for which the helper is getting registered. | |
1704 | * @set_opp: Custom set OPP helper. | |
1705 | * | |
1706 | * This is useful to support complex platforms (like platforms with multiple | |
1707 | * regulators per device), instead of the generic OPP set rate helper. | |
1708 | * | |
1709 | * This must be called before any OPPs are initialized for the device. | |
4dab160e | 1710 | */ |
fa30184d | 1711 | struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, |
4dab160e VK |
1712 | int (*set_opp)(struct dev_pm_set_opp_data *data)) |
1713 | { | |
1714 | struct opp_table *opp_table; | |
4dab160e VK |
1715 | |
1716 | if (!set_opp) | |
fa30184d | 1717 | return ERR_PTR(-EINVAL); |
4dab160e | 1718 | |
fa30184d VK |
1719 | opp_table = dev_pm_opp_get_opp_table(dev); |
1720 | if (!opp_table) | |
1721 | return ERR_PTR(-ENOMEM); | |
4dab160e VK |
1722 | |
1723 | /* This should be called before OPPs are initialized */ | |
1724 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
5019acc6 VK |
1725 | dev_pm_opp_put_opp_table(opp_table); |
1726 | return ERR_PTR(-EBUSY); | |
4dab160e VK |
1727 | } |
1728 | ||
5019acc6 VK |
1729 | /* Another CPU that shares the OPP table has set the helper ? */ |
1730 | if (!opp_table->set_opp) | |
1731 | opp_table->set_opp = set_opp; | |
4dab160e | 1732 | |
fa30184d | 1733 | return opp_table; |
4dab160e VK |
1734 | } |
1735 | EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); | |
1736 | ||
1737 | /** | |
604a7aeb | 1738 | * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for |
4dab160e | 1739 | * set_opp helper |
fa30184d | 1740 | * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper(). |
4dab160e | 1741 | * |
fa30184d | 1742 | * Release resources blocked for platform specific set_opp helper. |
4dab160e | 1743 | */ |
604a7aeb | 1744 | void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) |
4dab160e | 1745 | { |
4dab160e VK |
1746 | /* Make sure there are no concurrent readers while updating opp_table */ |
1747 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1748 | ||
1749 | opp_table->set_opp = NULL; | |
fa30184d | 1750 | dev_pm_opp_put_opp_table(opp_table); |
4dab160e | 1751 | } |
604a7aeb | 1752 | EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper); |
4dab160e | 1753 | |
6319aee1 VK |
1754 | static void _opp_detach_genpd(struct opp_table *opp_table) |
1755 | { | |
1756 | int index; | |
1757 | ||
1758 | for (index = 0; index < opp_table->required_opp_count; index++) { | |
1759 | if (!opp_table->genpd_virt_devs[index]) | |
1760 | continue; | |
1761 | ||
1762 | dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false); | |
1763 | opp_table->genpd_virt_devs[index] = NULL; | |
1764 | } | |
c0ab9e08 VK |
1765 | |
1766 | kfree(opp_table->genpd_virt_devs); | |
1767 | opp_table->genpd_virt_devs = NULL; | |
6319aee1 VK |
1768 | } |
1769 | ||
4f018bc0 | 1770 | /** |
6319aee1 VK |
1771 | * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer |
1772 | * @dev: Consumer device for which the genpd is getting attached. | |
1773 | * @names: Null terminated array of pointers containing names of genpd to attach. | |
4f018bc0 VK |
1774 | * |
1775 | * Multiple generic power domains for a device are supported with the help of | |
1776 | * virtual genpd devices, which are created for each consumer device - genpd | |
1777 | * pair. These are the device structures which are attached to the power domain | |
1778 | * and are required by the OPP core to set the performance state of the genpd. | |
6319aee1 VK |
1779 | * The same API also works for the case where single genpd is available and so |
1780 | * we don't need to support that separately. | |
4f018bc0 VK |
1781 | * |
1782 | * This helper will normally be called by the consumer driver of the device | |
6319aee1 | 1783 | * "dev", as only that has details of the genpd names. |
4f018bc0 | 1784 | * |
6319aee1 VK |
1785 | * This helper needs to be called once with a list of all genpd to attach. |
1786 | * Otherwise the original device structure will be used instead by the OPP core. | |
4f018bc0 | 1787 | */ |
6319aee1 | 1788 | struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names) |
4f018bc0 VK |
1789 | { |
1790 | struct opp_table *opp_table; | |
6319aee1 VK |
1791 | struct device *virt_dev; |
1792 | int index, ret = -EINVAL; | |
1793 | const char **name = names; | |
4f018bc0 VK |
1794 | |
1795 | opp_table = dev_pm_opp_get_opp_table(dev); | |
1796 | if (!opp_table) | |
1797 | return ERR_PTR(-ENOMEM); | |
1798 | ||
6319aee1 VK |
1799 | /* |
1800 | * If the genpd's OPP table isn't already initialized, parsing of the | |
1801 | * required-opps fail for dev. We should retry this after genpd's OPP | |
1802 | * table is added. | |
1803 | */ | |
1804 | if (!opp_table->required_opp_count) { | |
1805 | ret = -EPROBE_DEFER; | |
1806 | goto put_table; | |
1807 | } | |
1808 | ||
4f018bc0 VK |
1809 | mutex_lock(&opp_table->genpd_virt_dev_lock); |
1810 | ||
c0ab9e08 VK |
1811 | opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count, |
1812 | sizeof(*opp_table->genpd_virt_devs), | |
1813 | GFP_KERNEL); | |
1814 | if (!opp_table->genpd_virt_devs) | |
1815 | goto unlock; | |
4f018bc0 | 1816 | |
6319aee1 VK |
1817 | while (*name) { |
1818 | index = of_property_match_string(dev->of_node, | |
1819 | "power-domain-names", *name); | |
1820 | if (index < 0) { | |
1821 | dev_err(dev, "Failed to find power domain: %s (%d)\n", | |
1822 | *name, index); | |
1823 | goto err; | |
1824 | } | |
4f018bc0 | 1825 | |
6319aee1 VK |
1826 | if (index >= opp_table->required_opp_count) { |
1827 | dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n", | |
1828 | *name, opp_table->required_opp_count, index); | |
1829 | goto err; | |
1830 | } | |
4f018bc0 | 1831 | |
6319aee1 VK |
1832 | if (opp_table->genpd_virt_devs[index]) { |
1833 | dev_err(dev, "Genpd virtual device already set %s\n", | |
1834 | *name); | |
1835 | goto err; | |
1836 | } | |
1837 | ||
1838 | virt_dev = dev_pm_domain_attach_by_name(dev, *name); | |
1839 | if (IS_ERR(virt_dev)) { | |
1840 | ret = PTR_ERR(virt_dev); | |
1841 | dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret); | |
1842 | goto err; | |
1843 | } | |
1844 | ||
1845 | opp_table->genpd_virt_devs[index] = virt_dev; | |
1846 | name++; | |
4f018bc0 VK |
1847 | } |
1848 | ||
4f018bc0 VK |
1849 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
1850 | ||
1851 | return opp_table; | |
6319aee1 VK |
1852 | |
1853 | err: | |
1854 | _opp_detach_genpd(opp_table); | |
c0ab9e08 | 1855 | unlock: |
6319aee1 VK |
1856 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
1857 | ||
1858 | put_table: | |
1859 | dev_pm_opp_put_opp_table(opp_table); | |
1860 | ||
1861 | return ERR_PTR(ret); | |
4f018bc0 | 1862 | } |
6319aee1 | 1863 | EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd); |
4f018bc0 VK |
1864 | |
1865 | /** | |
6319aee1 VK |
1866 | * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device. |
1867 | * @opp_table: OPP table returned by dev_pm_opp_attach_genpd(). | |
4f018bc0 | 1868 | * |
6319aee1 VK |
1869 | * This detaches the genpd(s), resets the virtual device pointers, and puts the |
1870 | * OPP table. | |
4f018bc0 | 1871 | */ |
6319aee1 | 1872 | void dev_pm_opp_detach_genpd(struct opp_table *opp_table) |
4f018bc0 | 1873 | { |
4f018bc0 VK |
1874 | /* |
1875 | * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting | |
1876 | * used in parallel. | |
1877 | */ | |
1878 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
6319aee1 | 1879 | _opp_detach_genpd(opp_table); |
4f018bc0 VK |
1880 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
1881 | ||
6319aee1 | 1882 | dev_pm_opp_put_opp_table(opp_table); |
4f018bc0 | 1883 | } |
6319aee1 | 1884 | EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd); |
4f018bc0 | 1885 | |
c8a59103 VK |
1886 | /** |
1887 | * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table. | |
1888 | * @src_table: OPP table which has dst_table as one of its required OPP table. | |
1889 | * @dst_table: Required OPP table of the src_table. | |
1890 | * @pstate: Current performance state of the src_table. | |
1891 | * | |
1892 | * This Returns pstate of the OPP (present in @dst_table) pointed out by the | |
1893 | * "required-opps" property of the OPP (present in @src_table) which has | |
1894 | * performance state set to @pstate. | |
1895 | * | |
1896 | * Return: Zero or positive performance state on success, otherwise negative | |
1897 | * value on errors. | |
1898 | */ | |
1899 | int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, | |
1900 | struct opp_table *dst_table, | |
1901 | unsigned int pstate) | |
1902 | { | |
1903 | struct dev_pm_opp *opp; | |
1904 | int dest_pstate = -EINVAL; | |
1905 | int i; | |
1906 | ||
1907 | if (!pstate) | |
1908 | return 0; | |
1909 | ||
1910 | /* | |
1911 | * Normally the src_table will have the "required_opps" property set to | |
1912 | * point to one of the OPPs in the dst_table, but in some cases the | |
1913 | * genpd and its master have one to one mapping of performance states | |
1914 | * and so none of them have the "required-opps" property set. Return the | |
1915 | * pstate of the src_table as it is in such cases. | |
1916 | */ | |
1917 | if (!src_table->required_opp_count) | |
1918 | return pstate; | |
1919 | ||
1920 | for (i = 0; i < src_table->required_opp_count; i++) { | |
1921 | if (src_table->required_opp_tables[i]->np == dst_table->np) | |
1922 | break; | |
1923 | } | |
1924 | ||
1925 | if (unlikely(i == src_table->required_opp_count)) { | |
1926 | pr_err("%s: Couldn't find matching OPP table (%p: %p)\n", | |
1927 | __func__, src_table, dst_table); | |
1928 | return -EINVAL; | |
1929 | } | |
1930 | ||
1931 | mutex_lock(&src_table->lock); | |
1932 | ||
1933 | list_for_each_entry(opp, &src_table->opp_list, node) { | |
1934 | if (opp->pstate == pstate) { | |
1935 | dest_pstate = opp->required_opps[i]->pstate; | |
1936 | goto unlock; | |
1937 | } | |
1938 | } | |
1939 | ||
1940 | pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table, | |
1941 | dst_table); | |
1942 | ||
1943 | unlock: | |
1944 | mutex_unlock(&src_table->lock); | |
1945 | ||
1946 | return dest_pstate; | |
1947 | } | |
1948 | ||
38393409 VK |
1949 | /** |
1950 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
1951 | * @dev: device for which we do this operation | |
1952 | * @freq: Frequency in Hz for this OPP | |
1953 | * @u_volt: Voltage in uVolts for this OPP | |
1954 | * | |
2c2709dc | 1955 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
1956 | * The opp is made available by default and it can be controlled using |
1957 | * dev_pm_opp_enable/disable functions. | |
1958 | * | |
38393409 | 1959 | * Return: |
984f16c8 | 1960 | * 0 On success OR |
38393409 | 1961 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 1962 | * -EEXIST Freq are same and volt are different OR |
38393409 | 1963 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 1964 | * -ENOMEM Memory allocation failure |
38393409 VK |
1965 | */ |
1966 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
1967 | { | |
8cd2f6e8 VK |
1968 | struct opp_table *opp_table; |
1969 | int ret; | |
1970 | ||
b83c1899 VK |
1971 | opp_table = dev_pm_opp_get_opp_table(dev); |
1972 | if (!opp_table) | |
1973 | return -ENOMEM; | |
8cd2f6e8 | 1974 | |
46f48aca VK |
1975 | /* Fix regulator count for dynamic OPPs */ |
1976 | opp_table->regulator_count = 1; | |
1977 | ||
8cd2f6e8 | 1978 | ret = _opp_add_v1(opp_table, dev, freq, u_volt, true); |
0ad8c623 VK |
1979 | if (ret) |
1980 | dev_pm_opp_put_opp_table(opp_table); | |
8cd2f6e8 | 1981 | |
8cd2f6e8 | 1982 | return ret; |
38393409 | 1983 | } |
5d4879cd | 1984 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
1985 | |
1986 | /** | |
327854c8 | 1987 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
1988 | * @dev: device for which we do this operation |
1989 | * @freq: OPP frequency to modify availability | |
1990 | * @availability_req: availability status requested for this opp | |
1991 | * | |
052c6f19 VK |
1992 | * Set the availability of an OPP, opp_{enable,disable} share a common logic |
1993 | * which is isolated here. | |
e1f60b29 | 1994 | * |
984f16c8 | 1995 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1996 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 | 1997 | * successful. |
e1f60b29 | 1998 | */ |
327854c8 NM |
1999 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
2000 | bool availability_req) | |
e1f60b29 | 2001 | { |
2c2709dc | 2002 | struct opp_table *opp_table; |
a7f3987e | 2003 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
2004 | int r = 0; |
2005 | ||
2c2709dc VK |
2006 | /* Find the opp_table */ |
2007 | opp_table = _find_opp_table(dev); | |
2008 | if (IS_ERR(opp_table)) { | |
2009 | r = PTR_ERR(opp_table); | |
e1f60b29 | 2010 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
a7f3987e | 2011 | return r; |
e1f60b29 NM |
2012 | } |
2013 | ||
37a73ec0 VK |
2014 | mutex_lock(&opp_table->lock); |
2015 | ||
e1f60b29 | 2016 | /* Do we have the frequency? */ |
2c2709dc | 2017 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
2018 | if (tmp_opp->rate == freq) { |
2019 | opp = tmp_opp; | |
2020 | break; | |
2021 | } | |
2022 | } | |
37a73ec0 | 2023 | |
e1f60b29 NM |
2024 | if (IS_ERR(opp)) { |
2025 | r = PTR_ERR(opp); | |
2026 | goto unlock; | |
2027 | } | |
2028 | ||
2029 | /* Is update really needed? */ | |
2030 | if (opp->available == availability_req) | |
2031 | goto unlock; | |
e1f60b29 | 2032 | |
a7f3987e | 2033 | opp->available = availability_req; |
e1f60b29 | 2034 | |
e4d8ae00 VK |
2035 | dev_pm_opp_get(opp); |
2036 | mutex_unlock(&opp_table->lock); | |
2037 | ||
03ca370f MH |
2038 | /* Notify the change of the OPP availability */ |
2039 | if (availability_req) | |
052c6f19 | 2040 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE, |
a7f3987e | 2041 | opp); |
03ca370f | 2042 | else |
052c6f19 | 2043 | blocking_notifier_call_chain(&opp_table->head, |
a7f3987e | 2044 | OPP_EVENT_DISABLE, opp); |
e1f60b29 | 2045 | |
e4d8ae00 VK |
2046 | dev_pm_opp_put(opp); |
2047 | goto put_table; | |
2048 | ||
e1f60b29 | 2049 | unlock: |
5b650b38 | 2050 | mutex_unlock(&opp_table->lock); |
e4d8ae00 | 2051 | put_table: |
5b650b38 | 2052 | dev_pm_opp_put_opp_table(opp_table); |
e1f60b29 NM |
2053 | return r; |
2054 | } | |
2055 | ||
2056 | /** | |
5d4879cd | 2057 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
2058 | * @dev: device for which we do this operation |
2059 | * @freq: OPP frequency to enable | |
2060 | * | |
2061 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
2062 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 2063 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 2064 | * |
984f16c8 | 2065 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2066 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 2067 | * successful. |
e1f60b29 | 2068 | */ |
5d4879cd | 2069 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 2070 | { |
327854c8 | 2071 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 2072 | } |
5d4879cd | 2073 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
2074 | |
2075 | /** | |
5d4879cd | 2076 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
2077 | * @dev: device for which we do this operation |
2078 | * @freq: OPP frequency to disable | |
2079 | * | |
2080 | * Disables a provided opp. If the operation is valid, this returns | |
2081 | * 0, else the corresponding error value. It is meant to be a temporary | |
2082 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 2083 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 2084 | * |
984f16c8 | 2085 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2086 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 2087 | * successful. |
e1f60b29 | 2088 | */ |
5d4879cd | 2089 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 2090 | { |
327854c8 | 2091 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 2092 | } |
5d4879cd | 2093 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 2094 | |
03ca370f | 2095 | /** |
dc2c9ad5 VK |
2096 | * dev_pm_opp_register_notifier() - Register OPP notifier for the device |
2097 | * @dev: Device for which notifier needs to be registered | |
2098 | * @nb: Notifier block to be registered | |
984f16c8 | 2099 | * |
dc2c9ad5 VK |
2100 | * Return: 0 on success or a negative error value. |
2101 | */ | |
2102 | int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) | |
2103 | { | |
2104 | struct opp_table *opp_table; | |
2105 | int ret; | |
2106 | ||
dc2c9ad5 | 2107 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2108 | if (IS_ERR(opp_table)) |
2109 | return PTR_ERR(opp_table); | |
2110 | ||
052c6f19 | 2111 | ret = blocking_notifier_chain_register(&opp_table->head, nb); |
dc2c9ad5 | 2112 | |
5b650b38 | 2113 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2114 | |
2115 | return ret; | |
2116 | } | |
2117 | EXPORT_SYMBOL(dev_pm_opp_register_notifier); | |
2118 | ||
2119 | /** | |
2120 | * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device | |
2121 | * @dev: Device for which notifier needs to be unregistered | |
2122 | * @nb: Notifier block to be unregistered | |
984f16c8 | 2123 | * |
dc2c9ad5 | 2124 | * Return: 0 on success or a negative error value. |
03ca370f | 2125 | */ |
dc2c9ad5 VK |
2126 | int dev_pm_opp_unregister_notifier(struct device *dev, |
2127 | struct notifier_block *nb) | |
03ca370f | 2128 | { |
dc2c9ad5 VK |
2129 | struct opp_table *opp_table; |
2130 | int ret; | |
03ca370f | 2131 | |
dc2c9ad5 | 2132 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2133 | if (IS_ERR(opp_table)) |
2134 | return PTR_ERR(opp_table); | |
dc2c9ad5 | 2135 | |
052c6f19 | 2136 | ret = blocking_notifier_chain_unregister(&opp_table->head, nb); |
03ca370f | 2137 | |
5b650b38 | 2138 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2139 | |
2140 | return ret; | |
03ca370f | 2141 | } |
dc2c9ad5 | 2142 | EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); |
b496dfbc | 2143 | |
2a4eb735 | 2144 | void _dev_pm_opp_find_and_remove_table(struct device *dev) |
9274c892 VK |
2145 | { |
2146 | struct opp_table *opp_table; | |
2147 | ||
2c2709dc VK |
2148 | /* Check for existing table for 'dev' */ |
2149 | opp_table = _find_opp_table(dev); | |
2150 | if (IS_ERR(opp_table)) { | |
2151 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
2152 | |
2153 | if (error != -ENODEV) | |
2c2709dc | 2154 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
2155 | IS_ERR_OR_NULL(dev) ? |
2156 | "Invalid device" : dev_name(dev), | |
2157 | error); | |
5b650b38 | 2158 | return; |
737002b5 VK |
2159 | } |
2160 | ||
cdd6ed90 VK |
2161 | _put_opp_list_kref(opp_table); |
2162 | ||
2163 | /* Drop reference taken by _find_opp_table() */ | |
2164 | dev_pm_opp_put_opp_table(opp_table); | |
737002b5 | 2165 | |
cdd6ed90 | 2166 | /* Drop reference taken while the OPP table was added */ |
5b650b38 | 2167 | dev_pm_opp_put_opp_table(opp_table); |
737002b5 | 2168 | } |
129eec55 VK |
2169 | |
2170 | /** | |
411466c5 | 2171 | * dev_pm_opp_remove_table() - Free all OPPs associated with the device |
2c2709dc | 2172 | * @dev: device pointer used to lookup OPP table. |
129eec55 | 2173 | * |
411466c5 SH |
2174 | * Free both OPPs created using static entries present in DT and the |
2175 | * dynamically added entries. | |
129eec55 | 2176 | */ |
411466c5 | 2177 | void dev_pm_opp_remove_table(struct device *dev) |
129eec55 | 2178 | { |
2a4eb735 | 2179 | _dev_pm_opp_find_and_remove_table(dev); |
8d4d4e98 | 2180 | } |
411466c5 | 2181 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |