Commit | Line | Data |
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e1f60b29 NM |
1 | /* |
2 | * Generic OPP Interface | |
3 | * | |
4 | * Copyright (C) 2009-2010 Texas Instruments Incorporated. | |
5 | * Nishanth Menon | |
6 | * Romit Dasgupta | |
7 | * Kevin Hilman | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
d6d2a528 VK |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
d54974c2 | 16 | #include <linux/clk.h> |
e1f60b29 NM |
17 | #include <linux/errno.h> |
18 | #include <linux/err.h> | |
e1f60b29 | 19 | #include <linux/slab.h> |
51990e82 | 20 | #include <linux/device.h> |
80126ce7 | 21 | #include <linux/export.h> |
009acd19 | 22 | #include <linux/pm_domain.h> |
9f8ea969 | 23 | #include <linux/regulator/consumer.h> |
e1f60b29 | 24 | |
f59d3ee8 | 25 | #include "opp.h" |
e1f60b29 NM |
26 | |
27 | /* | |
2c2709dc VK |
28 | * The root of the list of all opp-tables. All opp_table structures branch off |
29 | * from here, with each opp_table containing the list of opps it supports in | |
e1f60b29 NM |
30 | * various states of availability. |
31 | */ | |
f47b72a1 | 32 | LIST_HEAD(opp_tables); |
e1f60b29 | 33 | /* Lock to allow exclusive modification to the device and opp lists */ |
2c2709dc | 34 | DEFINE_MUTEX(opp_table_lock); |
e1f60b29 | 35 | |
2c2709dc VK |
36 | static struct opp_device *_find_opp_dev(const struct device *dev, |
37 | struct opp_table *opp_table) | |
06441658 | 38 | { |
2c2709dc | 39 | struct opp_device *opp_dev; |
06441658 | 40 | |
2c2709dc VK |
41 | list_for_each_entry(opp_dev, &opp_table->dev_list, node) |
42 | if (opp_dev->dev == dev) | |
43 | return opp_dev; | |
06441658 VK |
44 | |
45 | return NULL; | |
46 | } | |
47 | ||
6ac42397 | 48 | static struct opp_table *_find_opp_table_unlocked(struct device *dev) |
5b650b38 VK |
49 | { |
50 | struct opp_table *opp_table; | |
3d255699 | 51 | bool found; |
5b650b38 VK |
52 | |
53 | list_for_each_entry(opp_table, &opp_tables, node) { | |
3d255699 VK |
54 | mutex_lock(&opp_table->lock); |
55 | found = !!_find_opp_dev(dev, opp_table); | |
56 | mutex_unlock(&opp_table->lock); | |
57 | ||
58 | if (found) { | |
5b650b38 VK |
59 | _get_opp_table_kref(opp_table); |
60 | ||
61 | return opp_table; | |
62 | } | |
63 | } | |
64 | ||
65 | return ERR_PTR(-ENODEV); | |
66 | } | |
67 | ||
e1f60b29 | 68 | /** |
2c2709dc VK |
69 | * _find_opp_table() - find opp_table struct using device pointer |
70 | * @dev: device pointer used to lookup OPP table | |
e1f60b29 | 71 | * |
052c6f19 | 72 | * Search OPP table for one containing matching device. |
e1f60b29 | 73 | * |
2c2709dc | 74 | * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or |
e1f60b29 NM |
75 | * -EINVAL based on type of error. |
76 | * | |
5b650b38 | 77 | * The callers must call dev_pm_opp_put_opp_table() after the table is used. |
e1f60b29 | 78 | */ |
2c2709dc | 79 | struct opp_table *_find_opp_table(struct device *dev) |
e1f60b29 | 80 | { |
2c2709dc | 81 | struct opp_table *opp_table; |
e1f60b29 | 82 | |
50a3cb04 | 83 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
84 | pr_err("%s: Invalid parameters\n", __func__); |
85 | return ERR_PTR(-EINVAL); | |
86 | } | |
87 | ||
5b650b38 VK |
88 | mutex_lock(&opp_table_lock); |
89 | opp_table = _find_opp_table_unlocked(dev); | |
90 | mutex_unlock(&opp_table_lock); | |
e1f60b29 | 91 | |
5b650b38 | 92 | return opp_table; |
e1f60b29 NM |
93 | } |
94 | ||
95 | /** | |
d6d00742 | 96 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
97 | * @opp: opp for which voltage has to be returned for |
98 | * | |
984f16c8 | 99 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
100 | * return 0 |
101 | * | |
dfbe4678 | 102 | * This is useful only for devices with single power supply. |
e1f60b29 | 103 | */ |
47d43ba7 | 104 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 105 | { |
052c6f19 | 106 | if (IS_ERR_OR_NULL(opp)) { |
e1f60b29 | 107 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
108 | return 0; |
109 | } | |
e1f60b29 | 110 | |
052c6f19 | 111 | return opp->supplies[0].u_volt; |
e1f60b29 | 112 | } |
5d4879cd | 113 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
114 | |
115 | /** | |
5d4879cd | 116 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
117 | * @opp: opp for which frequency has to be returned for |
118 | * | |
984f16c8 | 119 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 | 120 | * return 0 |
e1f60b29 | 121 | */ |
47d43ba7 | 122 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 123 | { |
052c6f19 | 124 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
e1f60b29 | 125 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
126 | return 0; |
127 | } | |
e1f60b29 | 128 | |
052c6f19 | 129 | return opp->rate; |
e1f60b29 | 130 | } |
5d4879cd | 131 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 132 | |
19445b25 BZ |
133 | /** |
134 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
135 | * @opp: opp for which turbo mode is being verified | |
136 | * | |
137 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
138 | * conditions) for short duration of times to finish high throughput work | |
139 | * quickly. Running on them for longer times may overheat the chip. | |
140 | * | |
141 | * Return: true if opp is turbo opp, else false. | |
19445b25 BZ |
142 | */ |
143 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
144 | { | |
052c6f19 | 145 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
19445b25 BZ |
146 | pr_err("%s: Invalid parameters\n", __func__); |
147 | return false; | |
148 | } | |
149 | ||
052c6f19 | 150 | return opp->turbo; |
19445b25 BZ |
151 | } |
152 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
153 | ||
3ca9bb33 VK |
154 | /** |
155 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
156 | * @dev: device for which we do this operation | |
157 | * | |
158 | * Return: This function returns the max clock latency in nanoseconds. | |
3ca9bb33 VK |
159 | */ |
160 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
161 | { | |
2c2709dc | 162 | struct opp_table *opp_table; |
3ca9bb33 VK |
163 | unsigned long clock_latency_ns; |
164 | ||
2c2709dc VK |
165 | opp_table = _find_opp_table(dev); |
166 | if (IS_ERR(opp_table)) | |
5b650b38 VK |
167 | return 0; |
168 | ||
169 | clock_latency_ns = opp_table->clock_latency_ns_max; | |
170 | ||
171 | dev_pm_opp_put_opp_table(opp_table); | |
3ca9bb33 | 172 | |
3ca9bb33 VK |
173 | return clock_latency_ns; |
174 | } | |
175 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
176 | ||
655c9df9 VK |
177 | /** |
178 | * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds | |
179 | * @dev: device for which we do this operation | |
180 | * | |
181 | * Return: This function returns the max voltage latency in nanoseconds. | |
655c9df9 VK |
182 | */ |
183 | unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) | |
184 | { | |
2c2709dc | 185 | struct opp_table *opp_table; |
655c9df9 | 186 | struct dev_pm_opp *opp; |
478256bd | 187 | struct regulator *reg; |
655c9df9 | 188 | unsigned long latency_ns = 0; |
dfbe4678 VK |
189 | int ret, i, count; |
190 | struct { | |
191 | unsigned long min; | |
192 | unsigned long max; | |
193 | } *uV; | |
194 | ||
cdd3e614 VK |
195 | opp_table = _find_opp_table(dev); |
196 | if (IS_ERR(opp_table)) | |
197 | return 0; | |
198 | ||
199 | count = opp_table->regulator_count; | |
dfbe4678 VK |
200 | |
201 | /* Regulator may not be required for the device */ | |
202 | if (!count) | |
cdd3e614 | 203 | goto put_opp_table; |
dfbe4678 | 204 | |
dfbe4678 VK |
205 | uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); |
206 | if (!uV) | |
478256bd | 207 | goto put_opp_table; |
655c9df9 | 208 | |
052c6f19 VK |
209 | mutex_lock(&opp_table->lock); |
210 | ||
dfbe4678 VK |
211 | for (i = 0; i < count; i++) { |
212 | uV[i].min = ~0; | |
213 | uV[i].max = 0; | |
655c9df9 | 214 | |
052c6f19 | 215 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
dfbe4678 VK |
216 | if (!opp->available) |
217 | continue; | |
218 | ||
219 | if (opp->supplies[i].u_volt_min < uV[i].min) | |
220 | uV[i].min = opp->supplies[i].u_volt_min; | |
221 | if (opp->supplies[i].u_volt_max > uV[i].max) | |
222 | uV[i].max = opp->supplies[i].u_volt_max; | |
223 | } | |
655c9df9 VK |
224 | } |
225 | ||
052c6f19 | 226 | mutex_unlock(&opp_table->lock); |
655c9df9 VK |
227 | |
228 | /* | |
2c2709dc | 229 | * The caller needs to ensure that opp_table (and hence the regulator) |
655c9df9 VK |
230 | * isn't freed, while we are executing this routine. |
231 | */ | |
8cc31116 | 232 | for (i = 0; i < count; i++) { |
478256bd | 233 | reg = opp_table->regulators[i]; |
dfbe4678 VK |
234 | ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); |
235 | if (ret > 0) | |
236 | latency_ns += ret * 1000; | |
237 | } | |
238 | ||
dfbe4678 | 239 | kfree(uV); |
cdd3e614 VK |
240 | put_opp_table: |
241 | dev_pm_opp_put_opp_table(opp_table); | |
655c9df9 VK |
242 | |
243 | return latency_ns; | |
244 | } | |
245 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); | |
246 | ||
21743447 VK |
247 | /** |
248 | * dev_pm_opp_get_max_transition_latency() - Get max transition latency in | |
249 | * nanoseconds | |
250 | * @dev: device for which we do this operation | |
251 | * | |
252 | * Return: This function returns the max transition latency, in nanoseconds, to | |
253 | * switch from one OPP to other. | |
21743447 VK |
254 | */ |
255 | unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) | |
256 | { | |
257 | return dev_pm_opp_get_max_volt_latency(dev) + | |
258 | dev_pm_opp_get_max_clock_latency(dev); | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); | |
261 | ||
4eafbd15 | 262 | /** |
3aa26a3b | 263 | * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz |
4eafbd15 BZ |
264 | * @dev: device for which we do this operation |
265 | * | |
3aa26a3b VK |
266 | * Return: This function returns the frequency of the OPP marked as suspend_opp |
267 | * if one is available, else returns 0; | |
4eafbd15 | 268 | */ |
3aa26a3b | 269 | unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev) |
4eafbd15 | 270 | { |
2c2709dc | 271 | struct opp_table *opp_table; |
3aa26a3b | 272 | unsigned long freq = 0; |
4eafbd15 | 273 | |
2c2709dc | 274 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
275 | if (IS_ERR(opp_table)) |
276 | return 0; | |
3aa26a3b | 277 | |
5b650b38 VK |
278 | if (opp_table->suspend_opp && opp_table->suspend_opp->available) |
279 | freq = dev_pm_opp_get_freq(opp_table->suspend_opp); | |
280 | ||
281 | dev_pm_opp_put_opp_table(opp_table); | |
4eafbd15 | 282 | |
3aa26a3b | 283 | return freq; |
4eafbd15 | 284 | } |
3aa26a3b | 285 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq); |
4eafbd15 | 286 | |
a1e8c136 VK |
287 | int _get_opp_count(struct opp_table *opp_table) |
288 | { | |
289 | struct dev_pm_opp *opp; | |
290 | int count = 0; | |
291 | ||
292 | mutex_lock(&opp_table->lock); | |
293 | ||
294 | list_for_each_entry(opp, &opp_table->opp_list, node) { | |
295 | if (opp->available) | |
296 | count++; | |
297 | } | |
298 | ||
299 | mutex_unlock(&opp_table->lock); | |
300 | ||
301 | return count; | |
302 | } | |
303 | ||
e1f60b29 | 304 | /** |
2c2709dc | 305 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table |
e1f60b29 NM |
306 | * @dev: device for which we do this operation |
307 | * | |
984f16c8 | 308 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 | 309 | * else returns 0 if none or the corresponding error value. |
e1f60b29 | 310 | */ |
5d4879cd | 311 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 | 312 | { |
2c2709dc | 313 | struct opp_table *opp_table; |
a1e8c136 | 314 | int count; |
e1f60b29 | 315 | |
2c2709dc VK |
316 | opp_table = _find_opp_table(dev); |
317 | if (IS_ERR(opp_table)) { | |
318 | count = PTR_ERR(opp_table); | |
035ed072 | 319 | dev_dbg(dev, "%s: OPP table not found (%d)\n", |
b4718c02 | 320 | __func__, count); |
09f662f9 | 321 | return count; |
e1f60b29 NM |
322 | } |
323 | ||
a1e8c136 | 324 | count = _get_opp_count(opp_table); |
5b650b38 VK |
325 | dev_pm_opp_put_opp_table(opp_table); |
326 | ||
e1f60b29 NM |
327 | return count; |
328 | } | |
5d4879cd | 329 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
330 | |
331 | /** | |
5d4879cd | 332 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
333 | * @dev: device for which we do this operation |
334 | * @freq: frequency to search for | |
7ae49618 | 335 | * @available: true/false - match for available opp |
e1f60b29 | 336 | * |
2c2709dc | 337 | * Return: Searches for exact match in the opp table and returns pointer to the |
984f16c8 NM |
338 | * matching opp if found, else returns ERR_PTR in case of error and should |
339 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
340 | * EINVAL: for bad pointer |
341 | * ERANGE: no match found for search | |
342 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
343 | * |
344 | * Note: available is a modifier for the search. if available=true, then the | |
345 | * match is for exact matching frequency and is available in the stored OPP | |
346 | * table. if false, the match is for exact frequency which is not available. | |
347 | * | |
348 | * This provides a mechanism to enable an opp which is not available currently | |
349 | * or the opposite as well. | |
350 | * | |
8a31d9d9 VK |
351 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
352 | * use. | |
e1f60b29 | 353 | */ |
47d43ba7 NM |
354 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
355 | unsigned long freq, | |
356 | bool available) | |
e1f60b29 | 357 | { |
2c2709dc | 358 | struct opp_table *opp_table; |
47d43ba7 | 359 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 360 | |
2c2709dc VK |
361 | opp_table = _find_opp_table(dev); |
362 | if (IS_ERR(opp_table)) { | |
363 | int r = PTR_ERR(opp_table); | |
364 | ||
365 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
e1f60b29 NM |
366 | return ERR_PTR(r); |
367 | } | |
368 | ||
052c6f19 | 369 | mutex_lock(&opp_table->lock); |
5b650b38 | 370 | |
052c6f19 | 371 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
372 | if (temp_opp->available == available && |
373 | temp_opp->rate == freq) { | |
374 | opp = temp_opp; | |
8a31d9d9 VK |
375 | |
376 | /* Increment the reference count of OPP */ | |
377 | dev_pm_opp_get(opp); | |
e1f60b29 NM |
378 | break; |
379 | } | |
380 | } | |
381 | ||
052c6f19 | 382 | mutex_unlock(&opp_table->lock); |
5b650b38 | 383 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 384 | |
e1f60b29 NM |
385 | return opp; |
386 | } | |
5d4879cd | 387 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 | 388 | |
067b7ce0 JZ |
389 | static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, |
390 | unsigned long *freq) | |
391 | { | |
392 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
393 | ||
052c6f19 VK |
394 | mutex_lock(&opp_table->lock); |
395 | ||
396 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
067b7ce0 JZ |
397 | if (temp_opp->available && temp_opp->rate >= *freq) { |
398 | opp = temp_opp; | |
399 | *freq = opp->rate; | |
8a31d9d9 VK |
400 | |
401 | /* Increment the reference count of OPP */ | |
402 | dev_pm_opp_get(opp); | |
067b7ce0 JZ |
403 | break; |
404 | } | |
405 | } | |
406 | ||
052c6f19 VK |
407 | mutex_unlock(&opp_table->lock); |
408 | ||
067b7ce0 JZ |
409 | return opp; |
410 | } | |
411 | ||
e1f60b29 | 412 | /** |
5d4879cd | 413 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
414 | * @dev: device for which we do this operation |
415 | * @freq: Start frequency | |
416 | * | |
417 | * Search for the matching ceil *available* OPP from a starting freq | |
418 | * for a device. | |
419 | * | |
984f16c8 | 420 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
421 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
422 | * values can be: | |
423 | * EINVAL: for bad pointer | |
424 | * ERANGE: no match found for search | |
425 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 426 | * |
8a31d9d9 VK |
427 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
428 | * use. | |
e1f60b29 | 429 | */ |
47d43ba7 NM |
430 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
431 | unsigned long *freq) | |
e1f60b29 | 432 | { |
2c2709dc | 433 | struct opp_table *opp_table; |
8a31d9d9 | 434 | struct dev_pm_opp *opp; |
b02ded24 | 435 | |
e1f60b29 NM |
436 | if (!dev || !freq) { |
437 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
438 | return ERR_PTR(-EINVAL); | |
439 | } | |
440 | ||
2c2709dc | 441 | opp_table = _find_opp_table(dev); |
5b650b38 | 442 | if (IS_ERR(opp_table)) |
2c2709dc | 443 | return ERR_CAST(opp_table); |
5b650b38 | 444 | |
8a31d9d9 | 445 | opp = _find_freq_ceil(opp_table, freq); |
e1f60b29 | 446 | |
5b650b38 | 447 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 VK |
448 | |
449 | return opp; | |
e1f60b29 | 450 | } |
5d4879cd | 451 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
452 | |
453 | /** | |
5d4879cd | 454 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
455 | * @dev: device for which we do this operation |
456 | * @freq: Start frequency | |
457 | * | |
458 | * Search for the matching floor *available* OPP from a starting freq | |
459 | * for a device. | |
460 | * | |
984f16c8 | 461 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
462 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
463 | * values can be: | |
464 | * EINVAL: for bad pointer | |
465 | * ERANGE: no match found for search | |
466 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 467 | * |
8a31d9d9 VK |
468 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
469 | * use. | |
e1f60b29 | 470 | */ |
47d43ba7 NM |
471 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
472 | unsigned long *freq) | |
e1f60b29 | 473 | { |
2c2709dc | 474 | struct opp_table *opp_table; |
47d43ba7 | 475 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 NM |
476 | |
477 | if (!dev || !freq) { | |
478 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
479 | return ERR_PTR(-EINVAL); | |
480 | } | |
481 | ||
2c2709dc | 482 | opp_table = _find_opp_table(dev); |
5b650b38 | 483 | if (IS_ERR(opp_table)) |
2c2709dc | 484 | return ERR_CAST(opp_table); |
5b650b38 | 485 | |
052c6f19 | 486 | mutex_lock(&opp_table->lock); |
e1f60b29 | 487 | |
052c6f19 | 488 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
489 | if (temp_opp->available) { |
490 | /* go to the next node, before choosing prev */ | |
491 | if (temp_opp->rate > *freq) | |
492 | break; | |
493 | else | |
494 | opp = temp_opp; | |
495 | } | |
496 | } | |
8a31d9d9 VK |
497 | |
498 | /* Increment the reference count of OPP */ | |
499 | if (!IS_ERR(opp)) | |
500 | dev_pm_opp_get(opp); | |
052c6f19 | 501 | mutex_unlock(&opp_table->lock); |
5b650b38 | 502 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 503 | |
e1f60b29 NM |
504 | if (!IS_ERR(opp)) |
505 | *freq = opp->rate; | |
506 | ||
507 | return opp; | |
508 | } | |
5d4879cd | 509 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 510 | |
6a0712f6 | 511 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, |
ce31781a | 512 | struct dev_pm_opp_supply *supply) |
6a0712f6 VK |
513 | { |
514 | int ret; | |
515 | ||
516 | /* Regulator not available for device */ | |
517 | if (IS_ERR(reg)) { | |
518 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
519 | PTR_ERR(reg)); | |
520 | return 0; | |
521 | } | |
522 | ||
ce31781a VK |
523 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, |
524 | supply->u_volt_min, supply->u_volt, supply->u_volt_max); | |
6a0712f6 | 525 | |
ce31781a VK |
526 | ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, |
527 | supply->u_volt, supply->u_volt_max); | |
6a0712f6 VK |
528 | if (ret) |
529 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
ce31781a VK |
530 | __func__, supply->u_volt_min, supply->u_volt, |
531 | supply->u_volt_max, ret); | |
6a0712f6 VK |
532 | |
533 | return ret; | |
534 | } | |
535 | ||
94735585 VK |
536 | static inline int |
537 | _generic_set_opp_clk_only(struct device *dev, struct clk *clk, | |
538 | unsigned long old_freq, unsigned long freq) | |
539 | { | |
540 | int ret; | |
541 | ||
542 | ret = clk_set_rate(clk, freq); | |
543 | if (ret) { | |
544 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
545 | ret); | |
546 | } | |
547 | ||
548 | return ret; | |
549 | } | |
550 | ||
009acd19 VK |
551 | static inline int |
552 | _generic_set_opp_domain(struct device *dev, struct clk *clk, | |
553 | unsigned long old_freq, unsigned long freq, | |
554 | unsigned int old_pstate, unsigned int new_pstate) | |
555 | { | |
556 | int ret; | |
557 | ||
558 | /* Scaling up? Scale domain performance state before frequency */ | |
559 | if (freq > old_freq) { | |
560 | ret = dev_pm_genpd_set_performance_state(dev, new_pstate); | |
561 | if (ret) | |
562 | return ret; | |
563 | } | |
564 | ||
565 | ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq); | |
566 | if (ret) | |
567 | goto restore_domain_state; | |
568 | ||
569 | /* Scaling down? Scale domain performance state after frequency */ | |
570 | if (freq < old_freq) { | |
571 | ret = dev_pm_genpd_set_performance_state(dev, new_pstate); | |
572 | if (ret) | |
573 | goto restore_freq; | |
574 | } | |
575 | ||
576 | return 0; | |
577 | ||
578 | restore_freq: | |
579 | if (_generic_set_opp_clk_only(dev, clk, freq, old_freq)) | |
580 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", | |
581 | __func__, old_freq); | |
582 | restore_domain_state: | |
583 | if (freq > old_freq) | |
584 | dev_pm_genpd_set_performance_state(dev, old_pstate); | |
585 | ||
586 | return ret; | |
587 | } | |
588 | ||
c74b32fa VK |
589 | static int _generic_set_opp_regulator(const struct opp_table *opp_table, |
590 | struct device *dev, | |
591 | unsigned long old_freq, | |
592 | unsigned long freq, | |
593 | struct dev_pm_opp_supply *old_supply, | |
594 | struct dev_pm_opp_supply *new_supply) | |
94735585 | 595 | { |
c74b32fa | 596 | struct regulator *reg = opp_table->regulators[0]; |
94735585 VK |
597 | int ret; |
598 | ||
599 | /* This function only supports single regulator per device */ | |
c74b32fa | 600 | if (WARN_ON(opp_table->regulator_count > 1)) { |
94735585 VK |
601 | dev_err(dev, "multiple regulators are not supported\n"); |
602 | return -EINVAL; | |
603 | } | |
604 | ||
605 | /* Scaling up? Scale voltage before frequency */ | |
c5c2a97b | 606 | if (freq >= old_freq) { |
94735585 VK |
607 | ret = _set_opp_voltage(dev, reg, new_supply); |
608 | if (ret) | |
609 | goto restore_voltage; | |
610 | } | |
611 | ||
612 | /* Change frequency */ | |
c74b32fa | 613 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, old_freq, freq); |
94735585 VK |
614 | if (ret) |
615 | goto restore_voltage; | |
616 | ||
617 | /* Scaling down? Scale voltage after frequency */ | |
618 | if (freq < old_freq) { | |
619 | ret = _set_opp_voltage(dev, reg, new_supply); | |
620 | if (ret) | |
621 | goto restore_freq; | |
622 | } | |
623 | ||
624 | return 0; | |
625 | ||
626 | restore_freq: | |
c74b32fa | 627 | if (_generic_set_opp_clk_only(dev, opp_table->clk, freq, old_freq)) |
94735585 VK |
628 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
629 | __func__, old_freq); | |
630 | restore_voltage: | |
631 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
c74b32fa | 632 | if (old_supply) |
94735585 VK |
633 | _set_opp_voltage(dev, reg, old_supply); |
634 | ||
635 | return ret; | |
636 | } | |
637 | ||
7e535993 VK |
638 | static int _set_opp_custom(const struct opp_table *opp_table, |
639 | struct device *dev, unsigned long old_freq, | |
640 | unsigned long freq, | |
641 | struct dev_pm_opp_supply *old_supply, | |
642 | struct dev_pm_opp_supply *new_supply) | |
643 | { | |
644 | struct dev_pm_set_opp_data *data; | |
645 | int size; | |
646 | ||
647 | data = opp_table->set_opp_data; | |
648 | data->regulators = opp_table->regulators; | |
649 | data->regulator_count = opp_table->regulator_count; | |
650 | data->clk = opp_table->clk; | |
651 | data->dev = dev; | |
652 | ||
653 | data->old_opp.rate = old_freq; | |
654 | size = sizeof(*old_supply) * opp_table->regulator_count; | |
655 | if (IS_ERR(old_supply)) | |
656 | memset(data->old_opp.supplies, 0, size); | |
657 | else | |
658 | memcpy(data->old_opp.supplies, old_supply, size); | |
659 | ||
660 | data->new_opp.rate = freq; | |
661 | memcpy(data->new_opp.supplies, new_supply, size); | |
662 | ||
663 | return opp_table->set_opp(data); | |
664 | } | |
665 | ||
6a0712f6 VK |
666 | /** |
667 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
668 | * @dev: device for which we do this operation | |
669 | * @target_freq: frequency to achieve | |
670 | * | |
671 | * This configures the power-supplies and clock source to the levels specified | |
672 | * by the OPP corresponding to the target_freq. | |
6a0712f6 VK |
673 | */ |
674 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
675 | { | |
2c2709dc | 676 | struct opp_table *opp_table; |
94735585 | 677 | unsigned long freq, old_freq; |
6a0712f6 | 678 | struct dev_pm_opp *old_opp, *opp; |
6a0712f6 | 679 | struct clk *clk; |
7e535993 | 680 | int ret; |
6a0712f6 VK |
681 | |
682 | if (unlikely(!target_freq)) { | |
683 | dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, | |
684 | target_freq); | |
685 | return -EINVAL; | |
686 | } | |
687 | ||
052c6f19 VK |
688 | opp_table = _find_opp_table(dev); |
689 | if (IS_ERR(opp_table)) { | |
690 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); | |
691 | return PTR_ERR(opp_table); | |
692 | } | |
693 | ||
694 | clk = opp_table->clk; | |
695 | if (IS_ERR(clk)) { | |
696 | dev_err(dev, "%s: No clock available for the device\n", | |
697 | __func__); | |
698 | ret = PTR_ERR(clk); | |
699 | goto put_opp_table; | |
700 | } | |
6a0712f6 VK |
701 | |
702 | freq = clk_round_rate(clk, target_freq); | |
703 | if ((long)freq <= 0) | |
704 | freq = target_freq; | |
705 | ||
706 | old_freq = clk_get_rate(clk); | |
707 | ||
708 | /* Return early if nothing to do */ | |
709 | if (old_freq == freq) { | |
710 | dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", | |
711 | __func__, freq); | |
052c6f19 VK |
712 | ret = 0; |
713 | goto put_opp_table; | |
6a0712f6 VK |
714 | } |
715 | ||
067b7ce0 | 716 | old_opp = _find_freq_ceil(opp_table, &old_freq); |
4df27c91 | 717 | if (IS_ERR(old_opp)) { |
6a0712f6 VK |
718 | dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", |
719 | __func__, old_freq, PTR_ERR(old_opp)); | |
720 | } | |
721 | ||
067b7ce0 | 722 | opp = _find_freq_ceil(opp_table, &freq); |
6a0712f6 VK |
723 | if (IS_ERR(opp)) { |
724 | ret = PTR_ERR(opp); | |
725 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
726 | __func__, freq, ret); | |
052c6f19 | 727 | goto put_old_opp; |
6a0712f6 VK |
728 | } |
729 | ||
94735585 VK |
730 | dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, |
731 | old_freq, freq); | |
dfbe4678 | 732 | |
7e535993 VK |
733 | if (opp_table->set_opp) { |
734 | ret = _set_opp_custom(opp_table, dev, old_freq, freq, | |
735 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
736 | opp->supplies); | |
737 | } else if (opp_table->regulators) { | |
738 | ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq, | |
739 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
740 | opp->supplies); | |
741 | } else { | |
742 | /* Only frequency scaling */ | |
743 | ||
009acd19 VK |
744 | /* |
745 | * We don't support devices with both regulator and | |
746 | * domain performance-state for now. | |
747 | */ | |
748 | if (opp_table->genpd_performance_state) | |
749 | ret = _generic_set_opp_domain(dev, clk, old_freq, freq, | |
750 | IS_ERR(old_opp) ? 0 : old_opp->pstate, | |
751 | opp->pstate); | |
752 | else | |
753 | ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq); | |
dfbe4678 VK |
754 | } |
755 | ||
8a31d9d9 | 756 | dev_pm_opp_put(opp); |
052c6f19 | 757 | put_old_opp: |
8a31d9d9 VK |
758 | if (!IS_ERR(old_opp)) |
759 | dev_pm_opp_put(old_opp); | |
052c6f19 | 760 | put_opp_table: |
5b650b38 | 761 | dev_pm_opp_put_opp_table(opp_table); |
052c6f19 | 762 | return ret; |
6a0712f6 VK |
763 | } |
764 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
765 | ||
2c2709dc | 766 | /* OPP-dev Helpers */ |
2c2709dc VK |
767 | static void _remove_opp_dev(struct opp_device *opp_dev, |
768 | struct opp_table *opp_table) | |
06441658 | 769 | { |
2c2709dc VK |
770 | opp_debug_unregister(opp_dev, opp_table); |
771 | list_del(&opp_dev->node); | |
052c6f19 | 772 | kfree(opp_dev); |
06441658 VK |
773 | } |
774 | ||
283d55e6 VK |
775 | static struct opp_device *_add_opp_dev_unlocked(const struct device *dev, |
776 | struct opp_table *opp_table) | |
06441658 | 777 | { |
2c2709dc | 778 | struct opp_device *opp_dev; |
deaa5146 | 779 | int ret; |
06441658 | 780 | |
2c2709dc VK |
781 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
782 | if (!opp_dev) | |
06441658 VK |
783 | return NULL; |
784 | ||
2c2709dc VK |
785 | /* Initialize opp-dev */ |
786 | opp_dev->dev = dev; | |
3d255699 | 787 | |
052c6f19 | 788 | list_add(&opp_dev->node, &opp_table->dev_list); |
06441658 | 789 | |
2c2709dc VK |
790 | /* Create debugfs entries for the opp_table */ |
791 | ret = opp_debug_register(opp_dev, opp_table); | |
deaa5146 VK |
792 | if (ret) |
793 | dev_err(dev, "%s: Failed to register opp debugfs (%d)\n", | |
794 | __func__, ret); | |
283d55e6 VK |
795 | |
796 | return opp_dev; | |
797 | } | |
798 | ||
799 | struct opp_device *_add_opp_dev(const struct device *dev, | |
800 | struct opp_table *opp_table) | |
801 | { | |
802 | struct opp_device *opp_dev; | |
803 | ||
804 | mutex_lock(&opp_table->lock); | |
805 | opp_dev = _add_opp_dev_unlocked(dev, opp_table); | |
3d255699 | 806 | mutex_unlock(&opp_table->lock); |
deaa5146 | 807 | |
2c2709dc | 808 | return opp_dev; |
06441658 VK |
809 | } |
810 | ||
eb7c8743 | 811 | static struct opp_table *_allocate_opp_table(struct device *dev, int index) |
07cce74a | 812 | { |
2c2709dc VK |
813 | struct opp_table *opp_table; |
814 | struct opp_device *opp_dev; | |
d54974c2 | 815 | int ret; |
07cce74a VK |
816 | |
817 | /* | |
2c2709dc | 818 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
819 | * device is needed to be added, we pay this penalty. |
820 | */ | |
2c2709dc VK |
821 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
822 | if (!opp_table) | |
07cce74a VK |
823 | return NULL; |
824 | ||
3d255699 | 825 | mutex_init(&opp_table->lock); |
2c2709dc | 826 | INIT_LIST_HEAD(&opp_table->dev_list); |
06441658 | 827 | |
2c2709dc VK |
828 | opp_dev = _add_opp_dev(dev, opp_table); |
829 | if (!opp_dev) { | |
830 | kfree(opp_table); | |
06441658 VK |
831 | return NULL; |
832 | } | |
833 | ||
eb7c8743 | 834 | _of_init_opp_table(opp_table, dev, index); |
50f8cfbd | 835 | |
d54974c2 | 836 | /* Find clk for the device */ |
2c2709dc VK |
837 | opp_table->clk = clk_get(dev, NULL); |
838 | if (IS_ERR(opp_table->clk)) { | |
839 | ret = PTR_ERR(opp_table->clk); | |
d54974c2 VK |
840 | if (ret != -EPROBE_DEFER) |
841 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, | |
842 | ret); | |
843 | } | |
844 | ||
052c6f19 | 845 | BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head); |
2c2709dc | 846 | INIT_LIST_HEAD(&opp_table->opp_list); |
f067a982 | 847 | kref_init(&opp_table->kref); |
07cce74a | 848 | |
2c2709dc | 849 | /* Secure the device table modification */ |
052c6f19 | 850 | list_add(&opp_table->node, &opp_tables); |
2c2709dc | 851 | return opp_table; |
07cce74a VK |
852 | } |
853 | ||
f067a982 | 854 | void _get_opp_table_kref(struct opp_table *opp_table) |
b6160e26 | 855 | { |
f067a982 VK |
856 | kref_get(&opp_table->kref); |
857 | } | |
858 | ||
eb7c8743 | 859 | static struct opp_table *_opp_get_opp_table(struct device *dev, int index) |
f067a982 VK |
860 | { |
861 | struct opp_table *opp_table; | |
862 | ||
863 | /* Hold our table modification lock here */ | |
864 | mutex_lock(&opp_table_lock); | |
865 | ||
5b650b38 VK |
866 | opp_table = _find_opp_table_unlocked(dev); |
867 | if (!IS_ERR(opp_table)) | |
f067a982 | 868 | goto unlock; |
f067a982 | 869 | |
283d55e6 VK |
870 | opp_table = _managed_opp(dev, index); |
871 | if (opp_table) { | |
872 | if (!_add_opp_dev_unlocked(dev, opp_table)) { | |
873 | dev_pm_opp_put_opp_table(opp_table); | |
874 | opp_table = NULL; | |
875 | } | |
876 | goto unlock; | |
877 | } | |
878 | ||
eb7c8743 | 879 | opp_table = _allocate_opp_table(dev, index); |
f067a982 VK |
880 | |
881 | unlock: | |
882 | mutex_unlock(&opp_table_lock); | |
883 | ||
884 | return opp_table; | |
885 | } | |
eb7c8743 VK |
886 | |
887 | struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) | |
888 | { | |
889 | return _opp_get_opp_table(dev, 0); | |
890 | } | |
f067a982 VK |
891 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); |
892 | ||
eb7c8743 VK |
893 | struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, |
894 | int index) | |
895 | { | |
896 | return _opp_get_opp_table(dev, index); | |
897 | } | |
898 | ||
b83c1899 | 899 | static void _opp_table_kref_release(struct kref *kref) |
f067a982 VK |
900 | { |
901 | struct opp_table *opp_table = container_of(kref, struct opp_table, kref); | |
cdd6ed90 | 902 | struct opp_device *opp_dev, *temp; |
b6160e26 | 903 | |
5d6d106f VK |
904 | _of_clear_opp_table(opp_table); |
905 | ||
b6160e26 VK |
906 | /* Release clk */ |
907 | if (!IS_ERR(opp_table->clk)) | |
908 | clk_put(opp_table->clk); | |
909 | ||
cdd6ed90 | 910 | WARN_ON(!list_empty(&opp_table->opp_list)); |
b6160e26 | 911 | |
cdd6ed90 VK |
912 | list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) { |
913 | /* | |
914 | * The OPP table is getting removed, drop the performance state | |
915 | * constraints. | |
916 | */ | |
917 | if (opp_table->genpd_performance_state) | |
918 | dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0); | |
b6160e26 | 919 | |
cdd6ed90 VK |
920 | _remove_opp_dev(opp_dev, opp_table); |
921 | } | |
b6160e26 | 922 | |
37a73ec0 | 923 | mutex_destroy(&opp_table->lock); |
052c6f19 VK |
924 | list_del(&opp_table->node); |
925 | kfree(opp_table); | |
b6160e26 | 926 | |
f067a982 VK |
927 | mutex_unlock(&opp_table_lock); |
928 | } | |
929 | ||
d0e8ae6c VK |
930 | void _opp_remove_all_static(struct opp_table *opp_table) |
931 | { | |
932 | struct dev_pm_opp *opp, *tmp; | |
933 | ||
934 | list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { | |
935 | if (!opp->dynamic) | |
936 | dev_pm_opp_put(opp); | |
937 | } | |
938 | ||
939 | opp_table->parsed_static_opps = false; | |
940 | } | |
941 | ||
942 | static void _opp_table_list_kref_release(struct kref *kref) | |
943 | { | |
944 | struct opp_table *opp_table = container_of(kref, struct opp_table, | |
945 | list_kref); | |
946 | ||
947 | _opp_remove_all_static(opp_table); | |
948 | mutex_unlock(&opp_table_lock); | |
949 | } | |
950 | ||
951 | void _put_opp_list_kref(struct opp_table *opp_table) | |
952 | { | |
953 | kref_put_mutex(&opp_table->list_kref, _opp_table_list_kref_release, | |
954 | &opp_table_lock); | |
955 | } | |
956 | ||
f067a982 VK |
957 | void dev_pm_opp_put_opp_table(struct opp_table *opp_table) |
958 | { | |
959 | kref_put_mutex(&opp_table->kref, _opp_table_kref_release, | |
960 | &opp_table_lock); | |
961 | } | |
962 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table); | |
963 | ||
8cd2f6e8 | 964 | void _opp_free(struct dev_pm_opp *opp) |
969fceb3 VK |
965 | { |
966 | kfree(opp); | |
969fceb3 VK |
967 | } |
968 | ||
7034764a | 969 | static void _opp_kref_release(struct kref *kref) |
129eec55 | 970 | { |
7034764a VK |
971 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); |
972 | struct opp_table *opp_table = opp->opp_table; | |
37a73ec0 | 973 | |
129eec55 VK |
974 | /* |
975 | * Notify the changes in the availability of the operable | |
976 | * frequency/voltage list. | |
977 | */ | |
052c6f19 | 978 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); |
da544b61 | 979 | _of_opp_free_required_opps(opp_table, opp); |
deaa5146 | 980 | opp_debug_remove_one(opp); |
052c6f19 VK |
981 | list_del(&opp->node); |
982 | kfree(opp); | |
129eec55 | 983 | |
37a73ec0 | 984 | mutex_unlock(&opp_table->lock); |
129eec55 VK |
985 | } |
986 | ||
a88bd2a5 | 987 | void dev_pm_opp_get(struct dev_pm_opp *opp) |
8a31d9d9 VK |
988 | { |
989 | kref_get(&opp->kref); | |
990 | } | |
991 | ||
7034764a VK |
992 | void dev_pm_opp_put(struct dev_pm_opp *opp) |
993 | { | |
994 | kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock); | |
995 | } | |
996 | EXPORT_SYMBOL_GPL(dev_pm_opp_put); | |
997 | ||
129eec55 | 998 | /** |
2c2709dc | 999 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
1000 | * @dev: device for which we do this operation |
1001 | * @freq: OPP to remove with matching 'freq' | |
1002 | * | |
2c2709dc | 1003 | * This function removes an opp from the opp table. |
129eec55 VK |
1004 | */ |
1005 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
1006 | { | |
1007 | struct dev_pm_opp *opp; | |
2c2709dc | 1008 | struct opp_table *opp_table; |
129eec55 VK |
1009 | bool found = false; |
1010 | ||
2c2709dc VK |
1011 | opp_table = _find_opp_table(dev); |
1012 | if (IS_ERR(opp_table)) | |
5b650b38 | 1013 | return; |
129eec55 | 1014 | |
37a73ec0 VK |
1015 | mutex_lock(&opp_table->lock); |
1016 | ||
2c2709dc | 1017 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
1018 | if (opp->rate == freq) { |
1019 | found = true; | |
1020 | break; | |
1021 | } | |
1022 | } | |
1023 | ||
37a73ec0 VK |
1024 | mutex_unlock(&opp_table->lock); |
1025 | ||
5b650b38 VK |
1026 | if (found) { |
1027 | dev_pm_opp_put(opp); | |
0ad8c623 VK |
1028 | |
1029 | /* Drop the reference taken by dev_pm_opp_add() */ | |
1030 | dev_pm_opp_put_opp_table(opp_table); | |
5b650b38 | 1031 | } else { |
129eec55 VK |
1032 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", |
1033 | __func__, freq); | |
129eec55 VK |
1034 | } |
1035 | ||
0ad8c623 | 1036 | /* Drop the reference taken by _find_opp_table() */ |
5b650b38 | 1037 | dev_pm_opp_put_opp_table(opp_table); |
129eec55 VK |
1038 | } |
1039 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
1040 | ||
8cd2f6e8 | 1041 | struct dev_pm_opp *_opp_allocate(struct opp_table *table) |
e1f60b29 | 1042 | { |
23dacf6d | 1043 | struct dev_pm_opp *opp; |
dfbe4678 | 1044 | int count, supply_size; |
e1f60b29 | 1045 | |
dfbe4678 VK |
1046 | /* Allocate space for at least one supply */ |
1047 | count = table->regulator_count ? table->regulator_count : 1; | |
1048 | supply_size = sizeof(*opp->supplies) * count; | |
e1f60b29 | 1049 | |
dfbe4678 VK |
1050 | /* allocate new OPP node and supplies structures */ |
1051 | opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL); | |
8cd2f6e8 | 1052 | if (!opp) |
23dacf6d | 1053 | return NULL; |
23dacf6d | 1054 | |
dfbe4678 VK |
1055 | /* Put the supplies at the end of the OPP structure as an empty array */ |
1056 | opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); | |
1057 | INIT_LIST_HEAD(&opp->node); | |
1058 | ||
23dacf6d VK |
1059 | return opp; |
1060 | } | |
1061 | ||
7d34d56e | 1062 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 1063 | struct opp_table *opp_table) |
7d34d56e | 1064 | { |
dfbe4678 VK |
1065 | struct regulator *reg; |
1066 | int i; | |
1067 | ||
1068 | for (i = 0; i < opp_table->regulator_count; i++) { | |
1069 | reg = opp_table->regulators[i]; | |
1070 | ||
1071 | if (!regulator_is_supported_voltage(reg, | |
1072 | opp->supplies[i].u_volt_min, | |
1073 | opp->supplies[i].u_volt_max)) { | |
1074 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
1075 | __func__, opp->supplies[i].u_volt_min, | |
1076 | opp->supplies[i].u_volt_max); | |
1077 | return false; | |
1078 | } | |
7d34d56e VK |
1079 | } |
1080 | ||
1081 | return true; | |
1082 | } | |
1083 | ||
a1e8c136 VK |
1084 | static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp, |
1085 | struct opp_table *opp_table, | |
1086 | struct list_head **head) | |
23dacf6d VK |
1087 | { |
1088 | struct dev_pm_opp *opp; | |
23dacf6d VK |
1089 | |
1090 | /* | |
1091 | * Insert new OPP in order of increasing frequency and discard if | |
1092 | * already present. | |
1093 | * | |
2c2709dc | 1094 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
1095 | * loop, don't replace it with head otherwise it will become an infinite |
1096 | * loop. | |
1097 | */ | |
052c6f19 | 1098 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
23dacf6d | 1099 | if (new_opp->rate > opp->rate) { |
a1e8c136 | 1100 | *head = &opp->node; |
23dacf6d VK |
1101 | continue; |
1102 | } | |
1103 | ||
1104 | if (new_opp->rate < opp->rate) | |
a1e8c136 | 1105 | return 0; |
23dacf6d VK |
1106 | |
1107 | /* Duplicate OPPs */ | |
06441658 | 1108 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
dfbe4678 VK |
1109 | __func__, opp->rate, opp->supplies[0].u_volt, |
1110 | opp->available, new_opp->rate, | |
1111 | new_opp->supplies[0].u_volt, new_opp->available); | |
23dacf6d | 1112 | |
dfbe4678 | 1113 | /* Should we compare voltages for all regulators here ? */ |
a1e8c136 VK |
1114 | return opp->available && |
1115 | new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST; | |
1116 | } | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Returns: | |
1123 | * 0: On success. And appropriate error message for duplicate OPPs. | |
1124 | * -EBUSY: For OPP with same freq/volt and is available. The callers of | |
1125 | * _opp_add() must return 0 if they receive -EBUSY from it. This is to make | |
1126 | * sure we don't print error messages unnecessarily if different parts of | |
1127 | * kernel try to initialize the OPP table. | |
1128 | * -EEXIST: For OPP with same freq but different volt or is unavailable. This | |
1129 | * should be considered an error by the callers of _opp_add(). | |
1130 | */ | |
1131 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, | |
1132 | struct opp_table *opp_table, bool rate_not_available) | |
1133 | { | |
1134 | struct list_head *head; | |
1135 | int ret; | |
1136 | ||
1137 | mutex_lock(&opp_table->lock); | |
1138 | head = &opp_table->opp_list; | |
37a73ec0 | 1139 | |
a1e8c136 VK |
1140 | if (likely(!rate_not_available)) { |
1141 | ret = _opp_is_duplicate(dev, new_opp, opp_table, &head); | |
1142 | if (ret) { | |
1143 | mutex_unlock(&opp_table->lock); | |
1144 | return ret; | |
1145 | } | |
23dacf6d VK |
1146 | } |
1147 | ||
052c6f19 | 1148 | list_add(&new_opp->node, head); |
37a73ec0 VK |
1149 | mutex_unlock(&opp_table->lock); |
1150 | ||
1151 | new_opp->opp_table = opp_table; | |
7034764a | 1152 | kref_init(&new_opp->kref); |
23dacf6d | 1153 | |
2c2709dc | 1154 | ret = opp_debug_create_one(new_opp, opp_table); |
deaa5146 VK |
1155 | if (ret) |
1156 | dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n", | |
1157 | __func__, ret); | |
1158 | ||
2c2709dc | 1159 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1160 | new_opp->available = false; |
1161 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1162 | __func__, new_opp->rate); | |
1163 | } | |
1164 | ||
23dacf6d VK |
1165 | return 0; |
1166 | } | |
1167 | ||
984f16c8 | 1168 | /** |
b64b9c3f | 1169 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
8cd2f6e8 | 1170 | * @opp_table: OPP table |
984f16c8 NM |
1171 | * @dev: device for which we do this operation |
1172 | * @freq: Frequency in Hz for this OPP | |
1173 | * @u_volt: Voltage in uVolts for this OPP | |
1174 | * @dynamic: Dynamically added OPPs. | |
1175 | * | |
2c2709dc | 1176 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1177 | * The opp is made available by default and it can be controlled using |
1178 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1179 | * | |
8f8d37b2 VK |
1180 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1181 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1182 | * |
984f16c8 NM |
1183 | * Return: |
1184 | * 0 On success OR | |
1185 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1186 | * -EEXIST Freq are same and volt are different OR | |
1187 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1188 | * -ENOMEM Memory allocation failure | |
1189 | */ | |
8cd2f6e8 VK |
1190 | int _opp_add_v1(struct opp_table *opp_table, struct device *dev, |
1191 | unsigned long freq, long u_volt, bool dynamic) | |
e1f60b29 | 1192 | { |
23dacf6d | 1193 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1194 | unsigned long tol; |
6ce4184d | 1195 | int ret; |
e1f60b29 | 1196 | |
8cd2f6e8 VK |
1197 | new_opp = _opp_allocate(opp_table); |
1198 | if (!new_opp) | |
1199 | return -ENOMEM; | |
23dacf6d | 1200 | |
a7470db6 | 1201 | /* populate the opp table */ |
a7470db6 | 1202 | new_opp->rate = freq; |
2c2709dc | 1203 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
dfbe4678 VK |
1204 | new_opp->supplies[0].u_volt = u_volt; |
1205 | new_opp->supplies[0].u_volt_min = u_volt - tol; | |
1206 | new_opp->supplies[0].u_volt_max = u_volt + tol; | |
a7470db6 | 1207 | new_opp->available = true; |
23dacf6d | 1208 | new_opp->dynamic = dynamic; |
a7470db6 | 1209 | |
a1e8c136 | 1210 | ret = _opp_add(dev, new_opp, opp_table, false); |
7f8538eb VK |
1211 | if (ret) { |
1212 | /* Don't return error for duplicate OPPs */ | |
1213 | if (ret == -EBUSY) | |
1214 | ret = 0; | |
6ce4184d | 1215 | goto free_opp; |
7f8538eb | 1216 | } |
64ce8545 | 1217 | |
03ca370f MH |
1218 | /* |
1219 | * Notify the changes in the availability of the operable | |
1220 | * frequency/voltage list. | |
1221 | */ | |
052c6f19 | 1222 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1223 | return 0; |
6ce4184d VK |
1224 | |
1225 | free_opp: | |
8cd2f6e8 VK |
1226 | _opp_free(new_opp); |
1227 | ||
6ce4184d | 1228 | return ret; |
e1f60b29 | 1229 | } |
38393409 | 1230 | |
7de36b0a VK |
1231 | /** |
1232 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1233 | * @dev: Device for which supported-hw has to be set. | |
1234 | * @versions: Array of hierarchy of versions to match. | |
1235 | * @count: Number of elements in the array. | |
1236 | * | |
1237 | * This is required only for the V2 bindings, and it enables a platform to | |
1238 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1239 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1240 | * property. | |
7de36b0a | 1241 | */ |
fa30184d VK |
1242 | struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, |
1243 | const u32 *versions, unsigned int count) | |
7de36b0a | 1244 | { |
2c2709dc | 1245 | struct opp_table *opp_table; |
7de36b0a | 1246 | |
fa30184d VK |
1247 | opp_table = dev_pm_opp_get_opp_table(dev); |
1248 | if (!opp_table) | |
1249 | return ERR_PTR(-ENOMEM); | |
7de36b0a | 1250 | |
2c2709dc VK |
1251 | /* Make sure there are no concurrent readers while updating opp_table */ |
1252 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1253 | |
25419de1 VK |
1254 | /* Another CPU that shares the OPP table has set the property ? */ |
1255 | if (opp_table->supported_hw) | |
1256 | return opp_table; | |
7de36b0a | 1257 | |
2c2709dc | 1258 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1259 | GFP_KERNEL); |
2c2709dc | 1260 | if (!opp_table->supported_hw) { |
25419de1 VK |
1261 | dev_pm_opp_put_opp_table(opp_table); |
1262 | return ERR_PTR(-ENOMEM); | |
7de36b0a VK |
1263 | } |
1264 | ||
2c2709dc | 1265 | opp_table->supported_hw_count = count; |
fa30184d VK |
1266 | |
1267 | return opp_table; | |
7de36b0a VK |
1268 | } |
1269 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1270 | ||
1271 | /** | |
1272 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
fa30184d | 1273 | * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw(). |
7de36b0a VK |
1274 | * |
1275 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1276 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a | 1277 | * will not be freed. |
7de36b0a | 1278 | */ |
fa30184d | 1279 | void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) |
7de36b0a | 1280 | { |
2c2709dc VK |
1281 | /* Make sure there are no concurrent readers while updating opp_table */ |
1282 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1283 | |
2c2709dc VK |
1284 | kfree(opp_table->supported_hw); |
1285 | opp_table->supported_hw = NULL; | |
1286 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1287 | |
fa30184d | 1288 | dev_pm_opp_put_opp_table(opp_table); |
7de36b0a VK |
1289 | } |
1290 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1291 | ||
01fb4d3c VK |
1292 | /** |
1293 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1294 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1295 | * @name: name to postfix to properties. |
1296 | * | |
1297 | * This is required only for the V2 bindings, and it enables a platform to | |
1298 | * specify the extn to be used for certain property names. The properties to | |
1299 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1300 | * should postfix the property name with -<name> while looking for them. | |
01fb4d3c | 1301 | */ |
fa30184d | 1302 | struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) |
01fb4d3c | 1303 | { |
2c2709dc | 1304 | struct opp_table *opp_table; |
01fb4d3c | 1305 | |
fa30184d VK |
1306 | opp_table = dev_pm_opp_get_opp_table(dev); |
1307 | if (!opp_table) | |
1308 | return ERR_PTR(-ENOMEM); | |
01fb4d3c | 1309 | |
2c2709dc VK |
1310 | /* Make sure there are no concurrent readers while updating opp_table */ |
1311 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1312 | |
878ec1a9 VK |
1313 | /* Another CPU that shares the OPP table has set the property ? */ |
1314 | if (opp_table->prop_name) | |
1315 | return opp_table; | |
01fb4d3c | 1316 | |
2c2709dc VK |
1317 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1318 | if (!opp_table->prop_name) { | |
878ec1a9 VK |
1319 | dev_pm_opp_put_opp_table(opp_table); |
1320 | return ERR_PTR(-ENOMEM); | |
01fb4d3c VK |
1321 | } |
1322 | ||
fa30184d | 1323 | return opp_table; |
01fb4d3c VK |
1324 | } |
1325 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1326 | ||
1327 | /** | |
1328 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
fa30184d | 1329 | * @opp_table: OPP table returned by dev_pm_opp_set_prop_name(). |
01fb4d3c VK |
1330 | * |
1331 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1332 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c | 1333 | * will not be freed. |
01fb4d3c | 1334 | */ |
fa30184d | 1335 | void dev_pm_opp_put_prop_name(struct opp_table *opp_table) |
01fb4d3c | 1336 | { |
2c2709dc VK |
1337 | /* Make sure there are no concurrent readers while updating opp_table */ |
1338 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1339 | |
2c2709dc VK |
1340 | kfree(opp_table->prop_name); |
1341 | opp_table->prop_name = NULL; | |
01fb4d3c | 1342 | |
fa30184d | 1343 | dev_pm_opp_put_opp_table(opp_table); |
01fb4d3c VK |
1344 | } |
1345 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1346 | ||
94735585 VK |
1347 | static int _allocate_set_opp_data(struct opp_table *opp_table) |
1348 | { | |
1349 | struct dev_pm_set_opp_data *data; | |
1350 | int len, count = opp_table->regulator_count; | |
1351 | ||
1352 | if (WARN_ON(!count)) | |
1353 | return -EINVAL; | |
1354 | ||
1355 | /* space for set_opp_data */ | |
1356 | len = sizeof(*data); | |
1357 | ||
1358 | /* space for old_opp.supplies and new_opp.supplies */ | |
1359 | len += 2 * sizeof(struct dev_pm_opp_supply) * count; | |
1360 | ||
1361 | data = kzalloc(len, GFP_KERNEL); | |
1362 | if (!data) | |
1363 | return -ENOMEM; | |
1364 | ||
1365 | data->old_opp.supplies = (void *)(data + 1); | |
1366 | data->new_opp.supplies = data->old_opp.supplies + count; | |
1367 | ||
1368 | opp_table->set_opp_data = data; | |
1369 | ||
1370 | return 0; | |
1371 | } | |
1372 | ||
1373 | static void _free_set_opp_data(struct opp_table *opp_table) | |
1374 | { | |
1375 | kfree(opp_table->set_opp_data); | |
1376 | opp_table->set_opp_data = NULL; | |
1377 | } | |
1378 | ||
9f8ea969 | 1379 | /** |
dfbe4678 | 1380 | * dev_pm_opp_set_regulators() - Set regulator names for the device |
9f8ea969 | 1381 | * @dev: Device for which regulator name is being set. |
dfbe4678 VK |
1382 | * @names: Array of pointers to the names of the regulator. |
1383 | * @count: Number of regulators. | |
9f8ea969 VK |
1384 | * |
1385 | * In order to support OPP switching, OPP layer needs to know the name of the | |
dfbe4678 VK |
1386 | * device's regulators, as the core would be required to switch voltages as |
1387 | * well. | |
9f8ea969 VK |
1388 | * |
1389 | * This must be called before any OPPs are initialized for the device. | |
9f8ea969 | 1390 | */ |
dfbe4678 VK |
1391 | struct opp_table *dev_pm_opp_set_regulators(struct device *dev, |
1392 | const char * const names[], | |
1393 | unsigned int count) | |
9f8ea969 | 1394 | { |
2c2709dc | 1395 | struct opp_table *opp_table; |
9f8ea969 | 1396 | struct regulator *reg; |
dfbe4678 | 1397 | int ret, i; |
9f8ea969 | 1398 | |
fa30184d VK |
1399 | opp_table = dev_pm_opp_get_opp_table(dev); |
1400 | if (!opp_table) | |
1401 | return ERR_PTR(-ENOMEM); | |
9f8ea969 VK |
1402 | |
1403 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1404 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1405 | ret = -EBUSY; |
1406 | goto err; | |
1407 | } | |
1408 | ||
779b783c VK |
1409 | /* Another CPU that shares the OPP table has set the regulators ? */ |
1410 | if (opp_table->regulators) | |
1411 | return opp_table; | |
dfbe4678 VK |
1412 | |
1413 | opp_table->regulators = kmalloc_array(count, | |
1414 | sizeof(*opp_table->regulators), | |
1415 | GFP_KERNEL); | |
1416 | if (!opp_table->regulators) { | |
1417 | ret = -ENOMEM; | |
9f8ea969 VK |
1418 | goto err; |
1419 | } | |
1420 | ||
dfbe4678 VK |
1421 | for (i = 0; i < count; i++) { |
1422 | reg = regulator_get_optional(dev, names[i]); | |
1423 | if (IS_ERR(reg)) { | |
1424 | ret = PTR_ERR(reg); | |
1425 | if (ret != -EPROBE_DEFER) | |
1426 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
1427 | __func__, names[i], ret); | |
1428 | goto free_regulators; | |
1429 | } | |
1430 | ||
1431 | opp_table->regulators[i] = reg; | |
1432 | } | |
1433 | ||
1434 | opp_table->regulator_count = count; | |
9f8ea969 | 1435 | |
94735585 VK |
1436 | /* Allocate block only once to pass to set_opp() routines */ |
1437 | ret = _allocate_set_opp_data(opp_table); | |
1438 | if (ret) | |
1439 | goto free_regulators; | |
1440 | ||
91291d9a | 1441 | return opp_table; |
9f8ea969 | 1442 | |
dfbe4678 VK |
1443 | free_regulators: |
1444 | while (i != 0) | |
1445 | regulator_put(opp_table->regulators[--i]); | |
1446 | ||
1447 | kfree(opp_table->regulators); | |
1448 | opp_table->regulators = NULL; | |
94735585 | 1449 | opp_table->regulator_count = 0; |
9f8ea969 | 1450 | err: |
fa30184d | 1451 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1452 | |
91291d9a | 1453 | return ERR_PTR(ret); |
9f8ea969 | 1454 | } |
dfbe4678 | 1455 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); |
9f8ea969 VK |
1456 | |
1457 | /** | |
dfbe4678 VK |
1458 | * dev_pm_opp_put_regulators() - Releases resources blocked for regulator |
1459 | * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). | |
9f8ea969 | 1460 | */ |
dfbe4678 | 1461 | void dev_pm_opp_put_regulators(struct opp_table *opp_table) |
9f8ea969 | 1462 | { |
dfbe4678 VK |
1463 | int i; |
1464 | ||
779b783c VK |
1465 | if (!opp_table->regulators) |
1466 | goto put_opp_table; | |
9f8ea969 | 1467 | |
2c2709dc VK |
1468 | /* Make sure there are no concurrent readers while updating opp_table */ |
1469 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
9f8ea969 | 1470 | |
dfbe4678 VK |
1471 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
1472 | regulator_put(opp_table->regulators[i]); | |
1473 | ||
94735585 VK |
1474 | _free_set_opp_data(opp_table); |
1475 | ||
dfbe4678 VK |
1476 | kfree(opp_table->regulators); |
1477 | opp_table->regulators = NULL; | |
1478 | opp_table->regulator_count = 0; | |
9f8ea969 | 1479 | |
779b783c | 1480 | put_opp_table: |
fa30184d | 1481 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1482 | } |
dfbe4678 | 1483 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); |
9f8ea969 | 1484 | |
829a4e8c VK |
1485 | /** |
1486 | * dev_pm_opp_set_clkname() - Set clk name for the device | |
1487 | * @dev: Device for which clk name is being set. | |
1488 | * @name: Clk name. | |
1489 | * | |
1490 | * In order to support OPP switching, OPP layer needs to get pointer to the | |
1491 | * clock for the device. Simple cases work fine without using this routine (i.e. | |
1492 | * by passing connection-id as NULL), but for a device with multiple clocks | |
1493 | * available, the OPP core needs to know the exact name of the clk to use. | |
1494 | * | |
1495 | * This must be called before any OPPs are initialized for the device. | |
1496 | */ | |
1497 | struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name) | |
1498 | { | |
1499 | struct opp_table *opp_table; | |
1500 | int ret; | |
1501 | ||
1502 | opp_table = dev_pm_opp_get_opp_table(dev); | |
1503 | if (!opp_table) | |
1504 | return ERR_PTR(-ENOMEM); | |
1505 | ||
1506 | /* This should be called before OPPs are initialized */ | |
1507 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
1508 | ret = -EBUSY; | |
1509 | goto err; | |
1510 | } | |
1511 | ||
1512 | /* Already have default clk set, free it */ | |
1513 | if (!IS_ERR(opp_table->clk)) | |
1514 | clk_put(opp_table->clk); | |
1515 | ||
1516 | /* Find clk for the device */ | |
1517 | opp_table->clk = clk_get(dev, name); | |
1518 | if (IS_ERR(opp_table->clk)) { | |
1519 | ret = PTR_ERR(opp_table->clk); | |
1520 | if (ret != -EPROBE_DEFER) { | |
1521 | dev_err(dev, "%s: Couldn't find clock: %d\n", __func__, | |
1522 | ret); | |
1523 | } | |
1524 | goto err; | |
1525 | } | |
1526 | ||
1527 | return opp_table; | |
1528 | ||
1529 | err: | |
1530 | dev_pm_opp_put_opp_table(opp_table); | |
1531 | ||
1532 | return ERR_PTR(ret); | |
1533 | } | |
1534 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname); | |
1535 | ||
1536 | /** | |
1537 | * dev_pm_opp_put_clkname() - Releases resources blocked for clk. | |
1538 | * @opp_table: OPP table returned from dev_pm_opp_set_clkname(). | |
1539 | */ | |
1540 | void dev_pm_opp_put_clkname(struct opp_table *opp_table) | |
1541 | { | |
1542 | /* Make sure there are no concurrent readers while updating opp_table */ | |
1543 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1544 | ||
1545 | clk_put(opp_table->clk); | |
1546 | opp_table->clk = ERR_PTR(-EINVAL); | |
1547 | ||
1548 | dev_pm_opp_put_opp_table(opp_table); | |
1549 | } | |
1550 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname); | |
1551 | ||
4dab160e VK |
1552 | /** |
1553 | * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
1554 | * @dev: Device for which the helper is getting registered. | |
1555 | * @set_opp: Custom set OPP helper. | |
1556 | * | |
1557 | * This is useful to support complex platforms (like platforms with multiple | |
1558 | * regulators per device), instead of the generic OPP set rate helper. | |
1559 | * | |
1560 | * This must be called before any OPPs are initialized for the device. | |
4dab160e | 1561 | */ |
fa30184d | 1562 | struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, |
4dab160e VK |
1563 | int (*set_opp)(struct dev_pm_set_opp_data *data)) |
1564 | { | |
1565 | struct opp_table *opp_table; | |
4dab160e VK |
1566 | |
1567 | if (!set_opp) | |
fa30184d | 1568 | return ERR_PTR(-EINVAL); |
4dab160e | 1569 | |
fa30184d VK |
1570 | opp_table = dev_pm_opp_get_opp_table(dev); |
1571 | if (!opp_table) | |
1572 | return ERR_PTR(-ENOMEM); | |
4dab160e VK |
1573 | |
1574 | /* This should be called before OPPs are initialized */ | |
1575 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
5019acc6 VK |
1576 | dev_pm_opp_put_opp_table(opp_table); |
1577 | return ERR_PTR(-EBUSY); | |
4dab160e VK |
1578 | } |
1579 | ||
5019acc6 VK |
1580 | /* Another CPU that shares the OPP table has set the helper ? */ |
1581 | if (!opp_table->set_opp) | |
1582 | opp_table->set_opp = set_opp; | |
4dab160e | 1583 | |
fa30184d | 1584 | return opp_table; |
4dab160e VK |
1585 | } |
1586 | EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); | |
1587 | ||
1588 | /** | |
604a7aeb | 1589 | * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for |
4dab160e | 1590 | * set_opp helper |
fa30184d | 1591 | * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper(). |
4dab160e | 1592 | * |
fa30184d | 1593 | * Release resources blocked for platform specific set_opp helper. |
4dab160e | 1594 | */ |
604a7aeb | 1595 | void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) |
4dab160e | 1596 | { |
4dab160e VK |
1597 | /* Make sure there are no concurrent readers while updating opp_table */ |
1598 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1599 | ||
1600 | opp_table->set_opp = NULL; | |
fa30184d | 1601 | dev_pm_opp_put_opp_table(opp_table); |
4dab160e | 1602 | } |
604a7aeb | 1603 | EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper); |
4dab160e | 1604 | |
38393409 VK |
1605 | /** |
1606 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
1607 | * @dev: device for which we do this operation | |
1608 | * @freq: Frequency in Hz for this OPP | |
1609 | * @u_volt: Voltage in uVolts for this OPP | |
1610 | * | |
2c2709dc | 1611 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
1612 | * The opp is made available by default and it can be controlled using |
1613 | * dev_pm_opp_enable/disable functions. | |
1614 | * | |
38393409 | 1615 | * Return: |
984f16c8 | 1616 | * 0 On success OR |
38393409 | 1617 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 1618 | * -EEXIST Freq are same and volt are different OR |
38393409 | 1619 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 1620 | * -ENOMEM Memory allocation failure |
38393409 VK |
1621 | */ |
1622 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
1623 | { | |
8cd2f6e8 VK |
1624 | struct opp_table *opp_table; |
1625 | int ret; | |
1626 | ||
b83c1899 VK |
1627 | opp_table = dev_pm_opp_get_opp_table(dev); |
1628 | if (!opp_table) | |
1629 | return -ENOMEM; | |
8cd2f6e8 VK |
1630 | |
1631 | ret = _opp_add_v1(opp_table, dev, freq, u_volt, true); | |
0ad8c623 VK |
1632 | if (ret) |
1633 | dev_pm_opp_put_opp_table(opp_table); | |
8cd2f6e8 | 1634 | |
8cd2f6e8 | 1635 | return ret; |
38393409 | 1636 | } |
5d4879cd | 1637 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
1638 | |
1639 | /** | |
327854c8 | 1640 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
1641 | * @dev: device for which we do this operation |
1642 | * @freq: OPP frequency to modify availability | |
1643 | * @availability_req: availability status requested for this opp | |
1644 | * | |
052c6f19 VK |
1645 | * Set the availability of an OPP, opp_{enable,disable} share a common logic |
1646 | * which is isolated here. | |
e1f60b29 | 1647 | * |
984f16c8 | 1648 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1649 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 | 1650 | * successful. |
e1f60b29 | 1651 | */ |
327854c8 NM |
1652 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
1653 | bool availability_req) | |
e1f60b29 | 1654 | { |
2c2709dc | 1655 | struct opp_table *opp_table; |
a7f3987e | 1656 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
1657 | int r = 0; |
1658 | ||
2c2709dc VK |
1659 | /* Find the opp_table */ |
1660 | opp_table = _find_opp_table(dev); | |
1661 | if (IS_ERR(opp_table)) { | |
1662 | r = PTR_ERR(opp_table); | |
e1f60b29 | 1663 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
a7f3987e | 1664 | return r; |
e1f60b29 NM |
1665 | } |
1666 | ||
37a73ec0 VK |
1667 | mutex_lock(&opp_table->lock); |
1668 | ||
e1f60b29 | 1669 | /* Do we have the frequency? */ |
2c2709dc | 1670 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
1671 | if (tmp_opp->rate == freq) { |
1672 | opp = tmp_opp; | |
1673 | break; | |
1674 | } | |
1675 | } | |
37a73ec0 | 1676 | |
e1f60b29 NM |
1677 | if (IS_ERR(opp)) { |
1678 | r = PTR_ERR(opp); | |
1679 | goto unlock; | |
1680 | } | |
1681 | ||
1682 | /* Is update really needed? */ | |
1683 | if (opp->available == availability_req) | |
1684 | goto unlock; | |
e1f60b29 | 1685 | |
a7f3987e | 1686 | opp->available = availability_req; |
e1f60b29 | 1687 | |
e4d8ae00 VK |
1688 | dev_pm_opp_get(opp); |
1689 | mutex_unlock(&opp_table->lock); | |
1690 | ||
03ca370f MH |
1691 | /* Notify the change of the OPP availability */ |
1692 | if (availability_req) | |
052c6f19 | 1693 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE, |
a7f3987e | 1694 | opp); |
03ca370f | 1695 | else |
052c6f19 | 1696 | blocking_notifier_call_chain(&opp_table->head, |
a7f3987e | 1697 | OPP_EVENT_DISABLE, opp); |
e1f60b29 | 1698 | |
e4d8ae00 VK |
1699 | dev_pm_opp_put(opp); |
1700 | goto put_table; | |
1701 | ||
e1f60b29 | 1702 | unlock: |
5b650b38 | 1703 | mutex_unlock(&opp_table->lock); |
e4d8ae00 | 1704 | put_table: |
5b650b38 | 1705 | dev_pm_opp_put_opp_table(opp_table); |
e1f60b29 NM |
1706 | return r; |
1707 | } | |
1708 | ||
1709 | /** | |
5d4879cd | 1710 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
1711 | * @dev: device for which we do this operation |
1712 | * @freq: OPP frequency to enable | |
1713 | * | |
1714 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
1715 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 1716 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 1717 | * |
984f16c8 | 1718 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1719 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1720 | * successful. |
e1f60b29 | 1721 | */ |
5d4879cd | 1722 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 1723 | { |
327854c8 | 1724 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 1725 | } |
5d4879cd | 1726 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
1727 | |
1728 | /** | |
5d4879cd | 1729 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
1730 | * @dev: device for which we do this operation |
1731 | * @freq: OPP frequency to disable | |
1732 | * | |
1733 | * Disables a provided opp. If the operation is valid, this returns | |
1734 | * 0, else the corresponding error value. It is meant to be a temporary | |
1735 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 1736 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 1737 | * |
984f16c8 | 1738 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1739 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1740 | * successful. |
e1f60b29 | 1741 | */ |
5d4879cd | 1742 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 1743 | { |
327854c8 | 1744 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 1745 | } |
5d4879cd | 1746 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 1747 | |
03ca370f | 1748 | /** |
dc2c9ad5 VK |
1749 | * dev_pm_opp_register_notifier() - Register OPP notifier for the device |
1750 | * @dev: Device for which notifier needs to be registered | |
1751 | * @nb: Notifier block to be registered | |
984f16c8 | 1752 | * |
dc2c9ad5 VK |
1753 | * Return: 0 on success or a negative error value. |
1754 | */ | |
1755 | int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) | |
1756 | { | |
1757 | struct opp_table *opp_table; | |
1758 | int ret; | |
1759 | ||
dc2c9ad5 | 1760 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
1761 | if (IS_ERR(opp_table)) |
1762 | return PTR_ERR(opp_table); | |
1763 | ||
052c6f19 | 1764 | ret = blocking_notifier_chain_register(&opp_table->head, nb); |
dc2c9ad5 | 1765 | |
5b650b38 | 1766 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
1767 | |
1768 | return ret; | |
1769 | } | |
1770 | EXPORT_SYMBOL(dev_pm_opp_register_notifier); | |
1771 | ||
1772 | /** | |
1773 | * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device | |
1774 | * @dev: Device for which notifier needs to be unregistered | |
1775 | * @nb: Notifier block to be unregistered | |
984f16c8 | 1776 | * |
dc2c9ad5 | 1777 | * Return: 0 on success or a negative error value. |
03ca370f | 1778 | */ |
dc2c9ad5 VK |
1779 | int dev_pm_opp_unregister_notifier(struct device *dev, |
1780 | struct notifier_block *nb) | |
03ca370f | 1781 | { |
dc2c9ad5 VK |
1782 | struct opp_table *opp_table; |
1783 | int ret; | |
03ca370f | 1784 | |
dc2c9ad5 | 1785 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
1786 | if (IS_ERR(opp_table)) |
1787 | return PTR_ERR(opp_table); | |
dc2c9ad5 | 1788 | |
052c6f19 | 1789 | ret = blocking_notifier_chain_unregister(&opp_table->head, nb); |
03ca370f | 1790 | |
5b650b38 | 1791 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
1792 | |
1793 | return ret; | |
03ca370f | 1794 | } |
dc2c9ad5 | 1795 | EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); |
b496dfbc | 1796 | |
2a4eb735 | 1797 | void _dev_pm_opp_find_and_remove_table(struct device *dev) |
9274c892 VK |
1798 | { |
1799 | struct opp_table *opp_table; | |
1800 | ||
2c2709dc VK |
1801 | /* Check for existing table for 'dev' */ |
1802 | opp_table = _find_opp_table(dev); | |
1803 | if (IS_ERR(opp_table)) { | |
1804 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
1805 | |
1806 | if (error != -ENODEV) | |
2c2709dc | 1807 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
1808 | IS_ERR_OR_NULL(dev) ? |
1809 | "Invalid device" : dev_name(dev), | |
1810 | error); | |
5b650b38 | 1811 | return; |
737002b5 VK |
1812 | } |
1813 | ||
cdd6ed90 VK |
1814 | _put_opp_list_kref(opp_table); |
1815 | ||
1816 | /* Drop reference taken by _find_opp_table() */ | |
1817 | dev_pm_opp_put_opp_table(opp_table); | |
737002b5 | 1818 | |
cdd6ed90 | 1819 | /* Drop reference taken while the OPP table was added */ |
5b650b38 | 1820 | dev_pm_opp_put_opp_table(opp_table); |
737002b5 | 1821 | } |
129eec55 VK |
1822 | |
1823 | /** | |
411466c5 | 1824 | * dev_pm_opp_remove_table() - Free all OPPs associated with the device |
2c2709dc | 1825 | * @dev: device pointer used to lookup OPP table. |
129eec55 | 1826 | * |
411466c5 SH |
1827 | * Free both OPPs created using static entries present in DT and the |
1828 | * dynamically added entries. | |
129eec55 | 1829 | */ |
411466c5 | 1830 | void dev_pm_opp_remove_table(struct device *dev) |
129eec55 | 1831 | { |
2a4eb735 | 1832 | _dev_pm_opp_find_and_remove_table(dev); |
8d4d4e98 | 1833 | } |
411466c5 | 1834 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |