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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> |
9f8ea969 | 22 | #include <linux/regulator/consumer.h> |
e1f60b29 | 23 | |
f59d3ee8 | 24 | #include "opp.h" |
e1f60b29 NM |
25 | |
26 | /* | |
2c2709dc VK |
27 | * The root of the list of all opp-tables. All opp_table structures branch off |
28 | * from here, with each opp_table containing the list of opps it supports in | |
e1f60b29 NM |
29 | * various states of availability. |
30 | */ | |
f47b72a1 | 31 | LIST_HEAD(opp_tables); |
e1f60b29 | 32 | /* Lock to allow exclusive modification to the device and opp lists */ |
2c2709dc | 33 | DEFINE_MUTEX(opp_table_lock); |
e1f60b29 | 34 | |
b02ded24 DT |
35 | #define opp_rcu_lockdep_assert() \ |
36 | do { \ | |
f78f5b90 | 37 | RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \ |
2c2709dc VK |
38 | !lockdep_is_held(&opp_table_lock), \ |
39 | "Missing rcu_read_lock() or " \ | |
40 | "opp_table_lock protection"); \ | |
b02ded24 DT |
41 | } while (0) |
42 | ||
2c2709dc VK |
43 | static struct opp_device *_find_opp_dev(const struct device *dev, |
44 | struct opp_table *opp_table) | |
06441658 | 45 | { |
2c2709dc | 46 | struct opp_device *opp_dev; |
06441658 | 47 | |
2c2709dc VK |
48 | list_for_each_entry(opp_dev, &opp_table->dev_list, node) |
49 | if (opp_dev->dev == dev) | |
50 | return opp_dev; | |
06441658 VK |
51 | |
52 | return NULL; | |
53 | } | |
54 | ||
e1f60b29 | 55 | /** |
2c2709dc VK |
56 | * _find_opp_table() - find opp_table struct using device pointer |
57 | * @dev: device pointer used to lookup OPP table | |
e1f60b29 | 58 | * |
2c2709dc VK |
59 | * Search OPP table for one containing matching device. Does a RCU reader |
60 | * operation to grab the pointer needed. | |
e1f60b29 | 61 | * |
2c2709dc | 62 | * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or |
e1f60b29 NM |
63 | * -EINVAL based on type of error. |
64 | * | |
0597e818 | 65 | * Locking: For readers, this function must be called under rcu_read_lock(). |
2c2709dc | 66 | * opp_table is a RCU protected pointer, which means that opp_table is valid |
0597e818 VK |
67 | * as long as we are under RCU lock. |
68 | * | |
2c2709dc | 69 | * For Writers, this function must be called with opp_table_lock held. |
e1f60b29 | 70 | */ |
2c2709dc | 71 | struct opp_table *_find_opp_table(struct device *dev) |
e1f60b29 | 72 | { |
2c2709dc | 73 | struct opp_table *opp_table; |
e1f60b29 | 74 | |
0597e818 VK |
75 | opp_rcu_lockdep_assert(); |
76 | ||
50a3cb04 | 77 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
78 | pr_err("%s: Invalid parameters\n", __func__); |
79 | return ERR_PTR(-EINVAL); | |
80 | } | |
81 | ||
2c2709dc VK |
82 | list_for_each_entry_rcu(opp_table, &opp_tables, node) |
83 | if (_find_opp_dev(dev, opp_table)) | |
84 | return opp_table; | |
e1f60b29 | 85 | |
06441658 | 86 | return ERR_PTR(-ENODEV); |
e1f60b29 NM |
87 | } |
88 | ||
89 | /** | |
d6d00742 | 90 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
91 | * @opp: opp for which voltage has to be returned for |
92 | * | |
984f16c8 | 93 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
94 | * return 0 |
95 | * | |
dfbe4678 VK |
96 | * This is useful only for devices with single power supply. |
97 | * | |
e1f60b29 NM |
98 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu |
99 | * protected pointer. This means that opp which could have been fetched by | |
100 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
101 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
102 | * used in the same section as the usage of this function with the pointer | |
103 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
104 | * pointer. | |
105 | */ | |
47d43ba7 | 106 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 107 | { |
47d43ba7 | 108 | struct dev_pm_opp *tmp_opp; |
e1f60b29 NM |
109 | unsigned long v = 0; |
110 | ||
04bf1c7f KK |
111 | opp_rcu_lockdep_assert(); |
112 | ||
e1f60b29 | 113 | tmp_opp = rcu_dereference(opp); |
d6d00742 | 114 | if (IS_ERR_OR_NULL(tmp_opp)) |
e1f60b29 NM |
115 | pr_err("%s: Invalid parameters\n", __func__); |
116 | else | |
dfbe4678 | 117 | v = tmp_opp->supplies[0].u_volt; |
e1f60b29 NM |
118 | |
119 | return v; | |
120 | } | |
5d4879cd | 121 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
122 | |
123 | /** | |
5d4879cd | 124 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
125 | * @opp: opp for which frequency has to be returned for |
126 | * | |
984f16c8 | 127 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 NM |
128 | * return 0 |
129 | * | |
130 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
131 | * protected pointer. This means that opp which could have been fetched by | |
132 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
133 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
134 | * used in the same section as the usage of this function with the pointer | |
135 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
136 | * pointer. | |
137 | */ | |
47d43ba7 | 138 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 139 | { |
47d43ba7 | 140 | struct dev_pm_opp *tmp_opp; |
e1f60b29 NM |
141 | unsigned long f = 0; |
142 | ||
04bf1c7f KK |
143 | opp_rcu_lockdep_assert(); |
144 | ||
e1f60b29 | 145 | tmp_opp = rcu_dereference(opp); |
50a3cb04 | 146 | if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available) |
e1f60b29 NM |
147 | pr_err("%s: Invalid parameters\n", __func__); |
148 | else | |
149 | f = tmp_opp->rate; | |
150 | ||
151 | return f; | |
152 | } | |
5d4879cd | 153 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 154 | |
19445b25 BZ |
155 | /** |
156 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
157 | * @opp: opp for which turbo mode is being verified | |
158 | * | |
159 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
160 | * conditions) for short duration of times to finish high throughput work | |
161 | * quickly. Running on them for longer times may overheat the chip. | |
162 | * | |
163 | * Return: true if opp is turbo opp, else false. | |
164 | * | |
165 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
166 | * protected pointer. This means that opp which could have been fetched by | |
167 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
168 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
169 | * used in the same section as the usage of this function with the pointer | |
170 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
171 | * pointer. | |
172 | */ | |
173 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
174 | { | |
175 | struct dev_pm_opp *tmp_opp; | |
176 | ||
177 | opp_rcu_lockdep_assert(); | |
178 | ||
179 | tmp_opp = rcu_dereference(opp); | |
180 | if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available) { | |
181 | pr_err("%s: Invalid parameters\n", __func__); | |
182 | return false; | |
183 | } | |
184 | ||
185 | return tmp_opp->turbo; | |
186 | } | |
187 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
188 | ||
3ca9bb33 VK |
189 | /** |
190 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
191 | * @dev: device for which we do this operation | |
192 | * | |
193 | * Return: This function returns the max clock latency in nanoseconds. | |
194 | * | |
195 | * Locking: This function takes rcu_read_lock(). | |
196 | */ | |
197 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
198 | { | |
2c2709dc | 199 | struct opp_table *opp_table; |
3ca9bb33 VK |
200 | unsigned long clock_latency_ns; |
201 | ||
202 | rcu_read_lock(); | |
203 | ||
2c2709dc VK |
204 | opp_table = _find_opp_table(dev); |
205 | if (IS_ERR(opp_table)) | |
3ca9bb33 VK |
206 | clock_latency_ns = 0; |
207 | else | |
2c2709dc | 208 | clock_latency_ns = opp_table->clock_latency_ns_max; |
3ca9bb33 VK |
209 | |
210 | rcu_read_unlock(); | |
211 | return clock_latency_ns; | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
214 | ||
dfbe4678 VK |
215 | static int _get_regulator_count(struct device *dev) |
216 | { | |
217 | struct opp_table *opp_table; | |
218 | int count; | |
219 | ||
220 | rcu_read_lock(); | |
221 | ||
222 | opp_table = _find_opp_table(dev); | |
223 | if (!IS_ERR(opp_table)) | |
224 | count = opp_table->regulator_count; | |
225 | else | |
226 | count = 0; | |
227 | ||
228 | rcu_read_unlock(); | |
229 | ||
230 | return count; | |
231 | } | |
232 | ||
655c9df9 VK |
233 | /** |
234 | * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds | |
235 | * @dev: device for which we do this operation | |
236 | * | |
237 | * Return: This function returns the max voltage latency in nanoseconds. | |
238 | * | |
239 | * Locking: This function takes rcu_read_lock(). | |
240 | */ | |
241 | unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) | |
242 | { | |
2c2709dc | 243 | struct opp_table *opp_table; |
655c9df9 | 244 | struct dev_pm_opp *opp; |
dfbe4678 | 245 | struct regulator *reg, **regulators; |
655c9df9 | 246 | unsigned long latency_ns = 0; |
dfbe4678 VK |
247 | int ret, i, count; |
248 | struct { | |
249 | unsigned long min; | |
250 | unsigned long max; | |
251 | } *uV; | |
252 | ||
253 | count = _get_regulator_count(dev); | |
254 | ||
255 | /* Regulator may not be required for the device */ | |
256 | if (!count) | |
257 | return 0; | |
258 | ||
259 | regulators = kmalloc_array(count, sizeof(*regulators), GFP_KERNEL); | |
260 | if (!regulators) | |
261 | return 0; | |
262 | ||
263 | uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); | |
264 | if (!uV) | |
265 | goto free_regulators; | |
655c9df9 VK |
266 | |
267 | rcu_read_lock(); | |
268 | ||
2c2709dc VK |
269 | opp_table = _find_opp_table(dev); |
270 | if (IS_ERR(opp_table)) { | |
655c9df9 | 271 | rcu_read_unlock(); |
dfbe4678 | 272 | goto free_uV; |
655c9df9 VK |
273 | } |
274 | ||
dfbe4678 | 275 | memcpy(regulators, opp_table->regulators, count * sizeof(*regulators)); |
655c9df9 | 276 | |
dfbe4678 VK |
277 | for (i = 0; i < count; i++) { |
278 | uV[i].min = ~0; | |
279 | uV[i].max = 0; | |
655c9df9 | 280 | |
dfbe4678 VK |
281 | list_for_each_entry_rcu(opp, &opp_table->opp_list, node) { |
282 | if (!opp->available) | |
283 | continue; | |
284 | ||
285 | if (opp->supplies[i].u_volt_min < uV[i].min) | |
286 | uV[i].min = opp->supplies[i].u_volt_min; | |
287 | if (opp->supplies[i].u_volt_max > uV[i].max) | |
288 | uV[i].max = opp->supplies[i].u_volt_max; | |
289 | } | |
655c9df9 VK |
290 | } |
291 | ||
292 | rcu_read_unlock(); | |
293 | ||
294 | /* | |
2c2709dc | 295 | * The caller needs to ensure that opp_table (and hence the regulator) |
655c9df9 VK |
296 | * isn't freed, while we are executing this routine. |
297 | */ | |
dfbe4678 VK |
298 | for (i = 0; reg = regulators[i], i < count; i++) { |
299 | ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); | |
300 | if (ret > 0) | |
301 | latency_ns += ret * 1000; | |
302 | } | |
303 | ||
304 | free_uV: | |
305 | kfree(uV); | |
306 | free_regulators: | |
307 | kfree(regulators); | |
655c9df9 VK |
308 | |
309 | return latency_ns; | |
310 | } | |
311 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); | |
312 | ||
21743447 VK |
313 | /** |
314 | * dev_pm_opp_get_max_transition_latency() - Get max transition latency in | |
315 | * nanoseconds | |
316 | * @dev: device for which we do this operation | |
317 | * | |
318 | * Return: This function returns the max transition latency, in nanoseconds, to | |
319 | * switch from one OPP to other. | |
320 | * | |
321 | * Locking: This function takes rcu_read_lock(). | |
322 | */ | |
323 | unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) | |
324 | { | |
325 | return dev_pm_opp_get_max_volt_latency(dev) + | |
326 | dev_pm_opp_get_max_clock_latency(dev); | |
327 | } | |
328 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); | |
329 | ||
4eafbd15 BZ |
330 | /** |
331 | * dev_pm_opp_get_suspend_opp() - Get suspend opp | |
332 | * @dev: device for which we do this operation | |
333 | * | |
334 | * Return: This function returns pointer to the suspend opp if it is | |
1b2b90cb | 335 | * defined and available, otherwise it returns NULL. |
4eafbd15 BZ |
336 | * |
337 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
338 | * protected pointer. The reason for the same is that the opp pointer which is | |
339 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
340 | * under the locked area. The pointer returned must be used prior to unlocking | |
341 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
342 | */ | |
343 | struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev) | |
344 | { | |
2c2709dc | 345 | struct opp_table *opp_table; |
4eafbd15 BZ |
346 | |
347 | opp_rcu_lockdep_assert(); | |
348 | ||
2c2709dc VK |
349 | opp_table = _find_opp_table(dev); |
350 | if (IS_ERR(opp_table) || !opp_table->suspend_opp || | |
351 | !opp_table->suspend_opp->available) | |
1b2b90cb | 352 | return NULL; |
4eafbd15 | 353 | |
2c2709dc | 354 | return opp_table->suspend_opp; |
4eafbd15 BZ |
355 | } |
356 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp); | |
357 | ||
e1f60b29 | 358 | /** |
2c2709dc | 359 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table |
e1f60b29 NM |
360 | * @dev: device for which we do this operation |
361 | * | |
984f16c8 | 362 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 NM |
363 | * else returns 0 if none or the corresponding error value. |
364 | * | |
b4718c02 | 365 | * Locking: This function takes rcu_read_lock(). |
e1f60b29 | 366 | */ |
5d4879cd | 367 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 | 368 | { |
2c2709dc | 369 | struct opp_table *opp_table; |
47d43ba7 | 370 | struct dev_pm_opp *temp_opp; |
e1f60b29 NM |
371 | int count = 0; |
372 | ||
b4718c02 | 373 | rcu_read_lock(); |
b02ded24 | 374 | |
2c2709dc VK |
375 | opp_table = _find_opp_table(dev); |
376 | if (IS_ERR(opp_table)) { | |
377 | count = PTR_ERR(opp_table); | |
378 | dev_err(dev, "%s: OPP table not found (%d)\n", | |
b4718c02 DT |
379 | __func__, count); |
380 | goto out_unlock; | |
e1f60b29 NM |
381 | } |
382 | ||
2c2709dc | 383 | list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
384 | if (temp_opp->available) |
385 | count++; | |
386 | } | |
387 | ||
b4718c02 DT |
388 | out_unlock: |
389 | rcu_read_unlock(); | |
e1f60b29 NM |
390 | return count; |
391 | } | |
5d4879cd | 392 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
393 | |
394 | /** | |
5d4879cd | 395 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
396 | * @dev: device for which we do this operation |
397 | * @freq: frequency to search for | |
7ae49618 | 398 | * @available: true/false - match for available opp |
e1f60b29 | 399 | * |
2c2709dc | 400 | * Return: Searches for exact match in the opp table and returns pointer to the |
984f16c8 NM |
401 | * matching opp if found, else returns ERR_PTR in case of error and should |
402 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
403 | * EINVAL: for bad pointer |
404 | * ERANGE: no match found for search | |
405 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
406 | * |
407 | * Note: available is a modifier for the search. if available=true, then the | |
408 | * match is for exact matching frequency and is available in the stored OPP | |
409 | * table. if false, the match is for exact frequency which is not available. | |
410 | * | |
411 | * This provides a mechanism to enable an opp which is not available currently | |
412 | * or the opposite as well. | |
413 | * | |
414 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
415 | * protected pointer. The reason for the same is that the opp pointer which is | |
416 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
417 | * under the locked area. The pointer returned must be used prior to unlocking | |
418 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
419 | */ | |
47d43ba7 NM |
420 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
421 | unsigned long freq, | |
422 | bool available) | |
e1f60b29 | 423 | { |
2c2709dc | 424 | struct opp_table *opp_table; |
47d43ba7 | 425 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 426 | |
b02ded24 DT |
427 | opp_rcu_lockdep_assert(); |
428 | ||
2c2709dc VK |
429 | opp_table = _find_opp_table(dev); |
430 | if (IS_ERR(opp_table)) { | |
431 | int r = PTR_ERR(opp_table); | |
432 | ||
433 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
e1f60b29 NM |
434 | return ERR_PTR(r); |
435 | } | |
436 | ||
2c2709dc | 437 | list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
438 | if (temp_opp->available == available && |
439 | temp_opp->rate == freq) { | |
440 | opp = temp_opp; | |
441 | break; | |
442 | } | |
443 | } | |
444 | ||
445 | return opp; | |
446 | } | |
5d4879cd | 447 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 | 448 | |
067b7ce0 JZ |
449 | static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, |
450 | unsigned long *freq) | |
451 | { | |
452 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
453 | ||
454 | list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { | |
455 | if (temp_opp->available && temp_opp->rate >= *freq) { | |
456 | opp = temp_opp; | |
457 | *freq = opp->rate; | |
458 | break; | |
459 | } | |
460 | } | |
461 | ||
462 | return opp; | |
463 | } | |
464 | ||
e1f60b29 | 465 | /** |
5d4879cd | 466 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
467 | * @dev: device for which we do this operation |
468 | * @freq: Start frequency | |
469 | * | |
470 | * Search for the matching ceil *available* OPP from a starting freq | |
471 | * for a device. | |
472 | * | |
984f16c8 | 473 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
474 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
475 | * values can be: | |
476 | * EINVAL: for bad pointer | |
477 | * ERANGE: no match found for search | |
478 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
479 | * |
480 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
481 | * protected pointer. The reason for the same is that the opp pointer which is | |
482 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
483 | * under the locked area. The pointer returned must be used prior to unlocking | |
484 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
485 | */ | |
47d43ba7 NM |
486 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
487 | unsigned long *freq) | |
e1f60b29 | 488 | { |
2c2709dc | 489 | struct opp_table *opp_table; |
e1f60b29 | 490 | |
b02ded24 DT |
491 | opp_rcu_lockdep_assert(); |
492 | ||
e1f60b29 NM |
493 | if (!dev || !freq) { |
494 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
495 | return ERR_PTR(-EINVAL); | |
496 | } | |
497 | ||
2c2709dc VK |
498 | opp_table = _find_opp_table(dev); |
499 | if (IS_ERR(opp_table)) | |
500 | return ERR_CAST(opp_table); | |
e1f60b29 | 501 | |
067b7ce0 | 502 | return _find_freq_ceil(opp_table, freq); |
e1f60b29 | 503 | } |
5d4879cd | 504 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
505 | |
506 | /** | |
5d4879cd | 507 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
508 | * @dev: device for which we do this operation |
509 | * @freq: Start frequency | |
510 | * | |
511 | * Search for the matching floor *available* OPP from a starting freq | |
512 | * for a device. | |
513 | * | |
984f16c8 | 514 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
515 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
516 | * values can be: | |
517 | * EINVAL: for bad pointer | |
518 | * ERANGE: no match found for search | |
519 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
520 | * |
521 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
522 | * protected pointer. The reason for the same is that the opp pointer which is | |
523 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
524 | * under the locked area. The pointer returned must be used prior to unlocking | |
525 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
526 | */ | |
47d43ba7 NM |
527 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
528 | unsigned long *freq) | |
e1f60b29 | 529 | { |
2c2709dc | 530 | struct opp_table *opp_table; |
47d43ba7 | 531 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 532 | |
b02ded24 DT |
533 | opp_rcu_lockdep_assert(); |
534 | ||
e1f60b29 NM |
535 | if (!dev || !freq) { |
536 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
537 | return ERR_PTR(-EINVAL); | |
538 | } | |
539 | ||
2c2709dc VK |
540 | opp_table = _find_opp_table(dev); |
541 | if (IS_ERR(opp_table)) | |
542 | return ERR_CAST(opp_table); | |
e1f60b29 | 543 | |
2c2709dc | 544 | list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
545 | if (temp_opp->available) { |
546 | /* go to the next node, before choosing prev */ | |
547 | if (temp_opp->rate > *freq) | |
548 | break; | |
549 | else | |
550 | opp = temp_opp; | |
551 | } | |
552 | } | |
553 | if (!IS_ERR(opp)) | |
554 | *freq = opp->rate; | |
555 | ||
556 | return opp; | |
557 | } | |
5d4879cd | 558 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 559 | |
6a0712f6 | 560 | /* |
2c2709dc | 561 | * The caller needs to ensure that opp_table (and hence the clk) isn't freed, |
6a0712f6 VK |
562 | * while clk returned here is used. |
563 | */ | |
564 | static struct clk *_get_opp_clk(struct device *dev) | |
565 | { | |
2c2709dc | 566 | struct opp_table *opp_table; |
6a0712f6 VK |
567 | struct clk *clk; |
568 | ||
569 | rcu_read_lock(); | |
570 | ||
2c2709dc VK |
571 | opp_table = _find_opp_table(dev); |
572 | if (IS_ERR(opp_table)) { | |
6a0712f6 | 573 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); |
2c2709dc | 574 | clk = ERR_CAST(opp_table); |
6a0712f6 VK |
575 | goto unlock; |
576 | } | |
577 | ||
2c2709dc | 578 | clk = opp_table->clk; |
6a0712f6 VK |
579 | if (IS_ERR(clk)) |
580 | dev_err(dev, "%s: No clock available for the device\n", | |
581 | __func__); | |
582 | ||
583 | unlock: | |
584 | rcu_read_unlock(); | |
585 | return clk; | |
586 | } | |
587 | ||
588 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, | |
ce31781a | 589 | struct dev_pm_opp_supply *supply) |
6a0712f6 VK |
590 | { |
591 | int ret; | |
592 | ||
593 | /* Regulator not available for device */ | |
594 | if (IS_ERR(reg)) { | |
595 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
596 | PTR_ERR(reg)); | |
597 | return 0; | |
598 | } | |
599 | ||
ce31781a VK |
600 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, |
601 | supply->u_volt_min, supply->u_volt, supply->u_volt_max); | |
6a0712f6 | 602 | |
ce31781a VK |
603 | ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, |
604 | supply->u_volt, supply->u_volt_max); | |
6a0712f6 VK |
605 | if (ret) |
606 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
ce31781a VK |
607 | __func__, supply->u_volt_min, supply->u_volt, |
608 | supply->u_volt_max, ret); | |
6a0712f6 VK |
609 | |
610 | return ret; | |
611 | } | |
612 | ||
94735585 VK |
613 | static inline int |
614 | _generic_set_opp_clk_only(struct device *dev, struct clk *clk, | |
615 | unsigned long old_freq, unsigned long freq) | |
616 | { | |
617 | int ret; | |
618 | ||
619 | ret = clk_set_rate(clk, freq); | |
620 | if (ret) { | |
621 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
622 | ret); | |
623 | } | |
624 | ||
625 | return ret; | |
626 | } | |
627 | ||
628 | static int _generic_set_opp(struct dev_pm_set_opp_data *data) | |
629 | { | |
630 | struct dev_pm_opp_supply *old_supply = data->old_opp.supplies; | |
631 | struct dev_pm_opp_supply *new_supply = data->new_opp.supplies; | |
632 | unsigned long old_freq = data->old_opp.rate, freq = data->new_opp.rate; | |
633 | struct regulator *reg = data->regulators[0]; | |
634 | struct device *dev= data->dev; | |
635 | int ret; | |
636 | ||
637 | /* This function only supports single regulator per device */ | |
638 | if (WARN_ON(data->regulator_count > 1)) { | |
639 | dev_err(dev, "multiple regulators are not supported\n"); | |
640 | return -EINVAL; | |
641 | } | |
642 | ||
643 | /* Scaling up? Scale voltage before frequency */ | |
644 | if (freq > old_freq) { | |
645 | ret = _set_opp_voltage(dev, reg, new_supply); | |
646 | if (ret) | |
647 | goto restore_voltage; | |
648 | } | |
649 | ||
650 | /* Change frequency */ | |
651 | ret = _generic_set_opp_clk_only(dev, data->clk, old_freq, freq); | |
652 | if (ret) | |
653 | goto restore_voltage; | |
654 | ||
655 | /* Scaling down? Scale voltage after frequency */ | |
656 | if (freq < old_freq) { | |
657 | ret = _set_opp_voltage(dev, reg, new_supply); | |
658 | if (ret) | |
659 | goto restore_freq; | |
660 | } | |
661 | ||
662 | return 0; | |
663 | ||
664 | restore_freq: | |
665 | if (_generic_set_opp_clk_only(dev, data->clk, freq, old_freq)) | |
666 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", | |
667 | __func__, old_freq); | |
668 | restore_voltage: | |
669 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
670 | if (old_supply->u_volt) | |
671 | _set_opp_voltage(dev, reg, old_supply); | |
672 | ||
673 | return ret; | |
674 | } | |
675 | ||
6a0712f6 VK |
676 | /** |
677 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
678 | * @dev: device for which we do this operation | |
679 | * @target_freq: frequency to achieve | |
680 | * | |
681 | * This configures the power-supplies and clock source to the levels specified | |
682 | * by the OPP corresponding to the target_freq. | |
683 | * | |
684 | * Locking: This function takes rcu_read_lock(). | |
685 | */ | |
686 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
687 | { | |
2c2709dc | 688 | struct opp_table *opp_table; |
94735585 | 689 | unsigned long freq, old_freq; |
6a0712f6 | 690 | struct dev_pm_opp *old_opp, *opp; |
94735585 VK |
691 | struct regulator **regulators; |
692 | struct dev_pm_set_opp_data *data; | |
6a0712f6 | 693 | struct clk *clk; |
94735585 | 694 | int ret, size; |
6a0712f6 VK |
695 | |
696 | if (unlikely(!target_freq)) { | |
697 | dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, | |
698 | target_freq); | |
699 | return -EINVAL; | |
700 | } | |
701 | ||
702 | clk = _get_opp_clk(dev); | |
703 | if (IS_ERR(clk)) | |
704 | return PTR_ERR(clk); | |
705 | ||
706 | freq = clk_round_rate(clk, target_freq); | |
707 | if ((long)freq <= 0) | |
708 | freq = target_freq; | |
709 | ||
710 | old_freq = clk_get_rate(clk); | |
711 | ||
712 | /* Return early if nothing to do */ | |
713 | if (old_freq == freq) { | |
714 | dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", | |
715 | __func__, freq); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | rcu_read_lock(); | |
720 | ||
2c2709dc VK |
721 | opp_table = _find_opp_table(dev); |
722 | if (IS_ERR(opp_table)) { | |
6a0712f6 VK |
723 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); |
724 | rcu_read_unlock(); | |
2c2709dc | 725 | return PTR_ERR(opp_table); |
6a0712f6 VK |
726 | } |
727 | ||
067b7ce0 | 728 | old_opp = _find_freq_ceil(opp_table, &old_freq); |
4df27c91 | 729 | if (IS_ERR(old_opp)) { |
6a0712f6 VK |
730 | dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", |
731 | __func__, old_freq, PTR_ERR(old_opp)); | |
732 | } | |
733 | ||
067b7ce0 | 734 | opp = _find_freq_ceil(opp_table, &freq); |
6a0712f6 VK |
735 | if (IS_ERR(opp)) { |
736 | ret = PTR_ERR(opp); | |
737 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
738 | __func__, freq, ret); | |
739 | rcu_read_unlock(); | |
740 | return ret; | |
741 | } | |
742 | ||
94735585 VK |
743 | dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, |
744 | old_freq, freq); | |
dfbe4678 | 745 | |
94735585 VK |
746 | regulators = opp_table->regulators; |
747 | ||
748 | /* Only frequency scaling */ | |
749 | if (!regulators) { | |
750 | rcu_read_unlock(); | |
751 | return _generic_set_opp_clk_only(dev, clk, old_freq, freq); | |
dfbe4678 VK |
752 | } |
753 | ||
94735585 VK |
754 | data = opp_table->set_opp_data; |
755 | data->regulators = regulators; | |
756 | data->regulator_count = opp_table->regulator_count; | |
757 | data->clk = clk; | |
758 | data->dev = dev; | |
759 | ||
760 | data->old_opp.rate = old_freq; | |
761 | size = sizeof(*opp->supplies) * opp_table->regulator_count; | |
ce31781a | 762 | if (IS_ERR(old_opp)) |
94735585 | 763 | memset(data->old_opp.supplies, 0, size); |
ce31781a | 764 | else |
94735585 | 765 | memcpy(data->old_opp.supplies, old_opp->supplies, size); |
6a0712f6 | 766 | |
94735585 VK |
767 | data->new_opp.rate = freq; |
768 | memcpy(data->new_opp.supplies, opp->supplies, size); | |
6a0712f6 VK |
769 | |
770 | rcu_read_unlock(); | |
771 | ||
94735585 | 772 | return _generic_set_opp(data); |
6a0712f6 VK |
773 | } |
774 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
775 | ||
2c2709dc VK |
776 | /* OPP-dev Helpers */ |
777 | static void _kfree_opp_dev_rcu(struct rcu_head *head) | |
06441658 | 778 | { |
2c2709dc | 779 | struct opp_device *opp_dev; |
06441658 | 780 | |
2c2709dc VK |
781 | opp_dev = container_of(head, struct opp_device, rcu_head); |
782 | kfree_rcu(opp_dev, rcu_head); | |
06441658 VK |
783 | } |
784 | ||
2c2709dc VK |
785 | static void _remove_opp_dev(struct opp_device *opp_dev, |
786 | struct opp_table *opp_table) | |
06441658 | 787 | { |
2c2709dc VK |
788 | opp_debug_unregister(opp_dev, opp_table); |
789 | list_del(&opp_dev->node); | |
790 | call_srcu(&opp_table->srcu_head.srcu, &opp_dev->rcu_head, | |
791 | _kfree_opp_dev_rcu); | |
06441658 VK |
792 | } |
793 | ||
2c2709dc VK |
794 | struct opp_device *_add_opp_dev(const struct device *dev, |
795 | struct opp_table *opp_table) | |
06441658 | 796 | { |
2c2709dc | 797 | struct opp_device *opp_dev; |
deaa5146 | 798 | int ret; |
06441658 | 799 | |
2c2709dc VK |
800 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
801 | if (!opp_dev) | |
06441658 VK |
802 | return NULL; |
803 | ||
2c2709dc VK |
804 | /* Initialize opp-dev */ |
805 | opp_dev->dev = dev; | |
806 | list_add_rcu(&opp_dev->node, &opp_table->dev_list); | |
06441658 | 807 | |
2c2709dc VK |
808 | /* Create debugfs entries for the opp_table */ |
809 | ret = opp_debug_register(opp_dev, opp_table); | |
deaa5146 VK |
810 | if (ret) |
811 | dev_err(dev, "%s: Failed to register opp debugfs (%d)\n", | |
812 | __func__, ret); | |
813 | ||
2c2709dc | 814 | return opp_dev; |
06441658 VK |
815 | } |
816 | ||
984f16c8 | 817 | /** |
2c2709dc | 818 | * _add_opp_table() - Find OPP table or allocate a new one |
984f16c8 NM |
819 | * @dev: device for which we do this operation |
820 | * | |
aa5f2f85 VK |
821 | * It tries to find an existing table first, if it couldn't find one, it |
822 | * allocates a new OPP table and returns that. | |
984f16c8 | 823 | * |
2c2709dc | 824 | * Return: valid opp_table pointer if success, else NULL. |
984f16c8 | 825 | */ |
2c2709dc | 826 | static struct opp_table *_add_opp_table(struct device *dev) |
07cce74a | 827 | { |
2c2709dc VK |
828 | struct opp_table *opp_table; |
829 | struct opp_device *opp_dev; | |
d54974c2 | 830 | int ret; |
07cce74a | 831 | |
2c2709dc VK |
832 | /* Check for existing table for 'dev' first */ |
833 | opp_table = _find_opp_table(dev); | |
834 | if (!IS_ERR(opp_table)) | |
835 | return opp_table; | |
07cce74a VK |
836 | |
837 | /* | |
2c2709dc | 838 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
839 | * device is needed to be added, we pay this penalty. |
840 | */ | |
2c2709dc VK |
841 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
842 | if (!opp_table) | |
07cce74a VK |
843 | return NULL; |
844 | ||
2c2709dc | 845 | INIT_LIST_HEAD(&opp_table->dev_list); |
06441658 | 846 | |
2c2709dc VK |
847 | opp_dev = _add_opp_dev(dev, opp_table); |
848 | if (!opp_dev) { | |
849 | kfree(opp_table); | |
06441658 VK |
850 | return NULL; |
851 | } | |
852 | ||
f47b72a1 | 853 | _of_init_opp_table(opp_table, dev); |
50f8cfbd | 854 | |
d54974c2 | 855 | /* Find clk for the device */ |
2c2709dc VK |
856 | opp_table->clk = clk_get(dev, NULL); |
857 | if (IS_ERR(opp_table->clk)) { | |
858 | ret = PTR_ERR(opp_table->clk); | |
d54974c2 VK |
859 | if (ret != -EPROBE_DEFER) |
860 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, | |
861 | ret); | |
862 | } | |
863 | ||
2c2709dc VK |
864 | srcu_init_notifier_head(&opp_table->srcu_head); |
865 | INIT_LIST_HEAD(&opp_table->opp_list); | |
07cce74a | 866 | |
2c2709dc VK |
867 | /* Secure the device table modification */ |
868 | list_add_rcu(&opp_table->node, &opp_tables); | |
869 | return opp_table; | |
07cce74a VK |
870 | } |
871 | ||
984f16c8 | 872 | /** |
2c2709dc | 873 | * _kfree_device_rcu() - Free opp_table RCU handler |
737002b5 | 874 | * @head: RCU head |
984f16c8 | 875 | */ |
737002b5 | 876 | static void _kfree_device_rcu(struct rcu_head *head) |
e1f60b29 | 877 | { |
2c2709dc VK |
878 | struct opp_table *opp_table = container_of(head, struct opp_table, |
879 | rcu_head); | |
6ce4184d | 880 | |
2c2709dc | 881 | kfree_rcu(opp_table, rcu_head); |
e1f60b29 | 882 | } |
38393409 VK |
883 | |
884 | /** | |
2c2709dc VK |
885 | * _remove_opp_table() - Removes a OPP table |
886 | * @opp_table: OPP table to be removed. | |
38393409 | 887 | * |
2c2709dc | 888 | * Removes/frees OPP table if it doesn't contain any OPPs. |
38393409 | 889 | */ |
2c2709dc | 890 | static void _remove_opp_table(struct opp_table *opp_table) |
38393409 | 891 | { |
2c2709dc | 892 | struct opp_device *opp_dev; |
06441658 | 893 | |
2c2709dc | 894 | if (!list_empty(&opp_table->opp_list)) |
3bac42ca VK |
895 | return; |
896 | ||
2c2709dc | 897 | if (opp_table->supported_hw) |
7de36b0a VK |
898 | return; |
899 | ||
2c2709dc | 900 | if (opp_table->prop_name) |
01fb4d3c VK |
901 | return; |
902 | ||
dfbe4678 | 903 | if (opp_table->regulators) |
9f8ea969 VK |
904 | return; |
905 | ||
d54974c2 | 906 | /* Release clk */ |
2c2709dc VK |
907 | if (!IS_ERR(opp_table->clk)) |
908 | clk_put(opp_table->clk); | |
d54974c2 | 909 | |
2c2709dc VK |
910 | opp_dev = list_first_entry(&opp_table->dev_list, struct opp_device, |
911 | node); | |
06441658 | 912 | |
2c2709dc | 913 | _remove_opp_dev(opp_dev, opp_table); |
06441658 VK |
914 | |
915 | /* dev_list must be empty now */ | |
2c2709dc | 916 | WARN_ON(!list_empty(&opp_table->dev_list)); |
06441658 | 917 | |
2c2709dc VK |
918 | list_del_rcu(&opp_table->node); |
919 | call_srcu(&opp_table->srcu_head.srcu, &opp_table->rcu_head, | |
3bac42ca | 920 | _kfree_device_rcu); |
38393409 | 921 | } |
e1f60b29 | 922 | |
984f16c8 NM |
923 | /** |
924 | * _kfree_opp_rcu() - Free OPP RCU handler | |
925 | * @head: RCU head | |
926 | */ | |
327854c8 | 927 | static void _kfree_opp_rcu(struct rcu_head *head) |
129eec55 VK |
928 | { |
929 | struct dev_pm_opp *opp = container_of(head, struct dev_pm_opp, rcu_head); | |
930 | ||
931 | kfree_rcu(opp, rcu_head); | |
932 | } | |
933 | ||
984f16c8 NM |
934 | /** |
935 | * _opp_remove() - Remove an OPP from a table definition | |
2c2709dc | 936 | * @opp_table: points back to the opp_table struct this opp belongs to |
984f16c8 | 937 | * @opp: pointer to the OPP to remove |
23dacf6d | 938 | * @notify: OPP_EVENT_REMOVE notification should be sent or not |
984f16c8 | 939 | * |
2c2709dc | 940 | * This function removes an opp definition from the opp table. |
984f16c8 | 941 | * |
2c2709dc | 942 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
943 | * It is assumed that the caller holds required mutex for an RCU updater |
944 | * strategy. | |
945 | */ | |
f47b72a1 VK |
946 | void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp, |
947 | bool notify) | |
129eec55 VK |
948 | { |
949 | /* | |
950 | * Notify the changes in the availability of the operable | |
951 | * frequency/voltage list. | |
952 | */ | |
23dacf6d | 953 | if (notify) |
2c2709dc VK |
954 | srcu_notifier_call_chain(&opp_table->srcu_head, |
955 | OPP_EVENT_REMOVE, opp); | |
deaa5146 | 956 | opp_debug_remove_one(opp); |
129eec55 | 957 | list_del_rcu(&opp->node); |
2c2709dc | 958 | call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu); |
129eec55 | 959 | |
2c2709dc | 960 | _remove_opp_table(opp_table); |
129eec55 VK |
961 | } |
962 | ||
963 | /** | |
2c2709dc | 964 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
965 | * @dev: device for which we do this operation |
966 | * @freq: OPP to remove with matching 'freq' | |
967 | * | |
2c2709dc | 968 | * This function removes an opp from the opp table. |
984f16c8 | 969 | * |
2c2709dc | 970 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
971 | * Hence this function internally uses RCU updater strategy with mutex locks |
972 | * to keep the integrity of the internal data structures. Callers should ensure | |
973 | * that this function is *NOT* called under RCU protection or in contexts where | |
974 | * mutex cannot be locked. | |
129eec55 VK |
975 | */ |
976 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
977 | { | |
978 | struct dev_pm_opp *opp; | |
2c2709dc | 979 | struct opp_table *opp_table; |
129eec55 VK |
980 | bool found = false; |
981 | ||
2c2709dc VK |
982 | /* Hold our table modification lock here */ |
983 | mutex_lock(&opp_table_lock); | |
129eec55 | 984 | |
2c2709dc VK |
985 | opp_table = _find_opp_table(dev); |
986 | if (IS_ERR(opp_table)) | |
129eec55 VK |
987 | goto unlock; |
988 | ||
2c2709dc | 989 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
990 | if (opp->rate == freq) { |
991 | found = true; | |
992 | break; | |
993 | } | |
994 | } | |
995 | ||
996 | if (!found) { | |
997 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", | |
998 | __func__, freq); | |
999 | goto unlock; | |
1000 | } | |
1001 | ||
2c2709dc | 1002 | _opp_remove(opp_table, opp, true); |
129eec55 | 1003 | unlock: |
2c2709dc | 1004 | mutex_unlock(&opp_table_lock); |
129eec55 VK |
1005 | } |
1006 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
1007 | ||
f47b72a1 VK |
1008 | struct dev_pm_opp *_allocate_opp(struct device *dev, |
1009 | struct opp_table **opp_table) | |
e1f60b29 | 1010 | { |
23dacf6d | 1011 | struct dev_pm_opp *opp; |
dfbe4678 VK |
1012 | int count, supply_size; |
1013 | struct opp_table *table; | |
e1f60b29 | 1014 | |
dfbe4678 VK |
1015 | table = _add_opp_table(dev); |
1016 | if (!table) | |
23dacf6d | 1017 | return NULL; |
e1f60b29 | 1018 | |
dfbe4678 VK |
1019 | /* Allocate space for at least one supply */ |
1020 | count = table->regulator_count ? table->regulator_count : 1; | |
1021 | supply_size = sizeof(*opp->supplies) * count; | |
e1f60b29 | 1022 | |
dfbe4678 VK |
1023 | /* allocate new OPP node and supplies structures */ |
1024 | opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL); | |
1025 | if (!opp) { | |
1026 | kfree(table); | |
23dacf6d VK |
1027 | return NULL; |
1028 | } | |
1029 | ||
dfbe4678 VK |
1030 | /* Put the supplies at the end of the OPP structure as an empty array */ |
1031 | opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); | |
1032 | INIT_LIST_HEAD(&opp->node); | |
1033 | ||
1034 | *opp_table = table; | |
1035 | ||
23dacf6d VK |
1036 | return opp; |
1037 | } | |
1038 | ||
7d34d56e | 1039 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 1040 | struct opp_table *opp_table) |
7d34d56e | 1041 | { |
dfbe4678 VK |
1042 | struct regulator *reg; |
1043 | int i; | |
1044 | ||
1045 | for (i = 0; i < opp_table->regulator_count; i++) { | |
1046 | reg = opp_table->regulators[i]; | |
1047 | ||
1048 | if (!regulator_is_supported_voltage(reg, | |
1049 | opp->supplies[i].u_volt_min, | |
1050 | opp->supplies[i].u_volt_max)) { | |
1051 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
1052 | __func__, opp->supplies[i].u_volt_min, | |
1053 | opp->supplies[i].u_volt_max); | |
1054 | return false; | |
1055 | } | |
7d34d56e VK |
1056 | } |
1057 | ||
1058 | return true; | |
1059 | } | |
1060 | ||
f47b72a1 VK |
1061 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, |
1062 | struct opp_table *opp_table) | |
23dacf6d VK |
1063 | { |
1064 | struct dev_pm_opp *opp; | |
2c2709dc | 1065 | struct list_head *head = &opp_table->opp_list; |
deaa5146 | 1066 | int ret; |
23dacf6d VK |
1067 | |
1068 | /* | |
1069 | * Insert new OPP in order of increasing frequency and discard if | |
1070 | * already present. | |
1071 | * | |
2c2709dc | 1072 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
1073 | * loop, don't replace it with head otherwise it will become an infinite |
1074 | * loop. | |
1075 | */ | |
2c2709dc | 1076 | list_for_each_entry_rcu(opp, &opp_table->opp_list, node) { |
23dacf6d VK |
1077 | if (new_opp->rate > opp->rate) { |
1078 | head = &opp->node; | |
1079 | continue; | |
1080 | } | |
1081 | ||
1082 | if (new_opp->rate < opp->rate) | |
1083 | break; | |
1084 | ||
1085 | /* Duplicate OPPs */ | |
06441658 | 1086 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
dfbe4678 VK |
1087 | __func__, opp->rate, opp->supplies[0].u_volt, |
1088 | opp->available, new_opp->rate, | |
1089 | new_opp->supplies[0].u_volt, new_opp->available); | |
23dacf6d | 1090 | |
dfbe4678 | 1091 | /* Should we compare voltages for all regulators here ? */ |
0f0fe7e0 | 1092 | return opp->available && |
dfbe4678 | 1093 | new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? 0 : -EEXIST; |
23dacf6d VK |
1094 | } |
1095 | ||
2c2709dc | 1096 | new_opp->opp_table = opp_table; |
23dacf6d VK |
1097 | list_add_rcu(&new_opp->node, head); |
1098 | ||
2c2709dc | 1099 | ret = opp_debug_create_one(new_opp, opp_table); |
deaa5146 VK |
1100 | if (ret) |
1101 | dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n", | |
1102 | __func__, ret); | |
1103 | ||
2c2709dc | 1104 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1105 | new_opp->available = false; |
1106 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1107 | __func__, new_opp->rate); | |
1108 | } | |
1109 | ||
23dacf6d VK |
1110 | return 0; |
1111 | } | |
1112 | ||
984f16c8 | 1113 | /** |
b64b9c3f | 1114 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
984f16c8 NM |
1115 | * @dev: device for which we do this operation |
1116 | * @freq: Frequency in Hz for this OPP | |
1117 | * @u_volt: Voltage in uVolts for this OPP | |
1118 | * @dynamic: Dynamically added OPPs. | |
1119 | * | |
2c2709dc | 1120 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1121 | * The opp is made available by default and it can be controlled using |
1122 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1123 | * | |
8f8d37b2 VK |
1124 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1125 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1126 | * |
2c2709dc | 1127 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
1128 | * Hence this function internally uses RCU updater strategy with mutex locks |
1129 | * to keep the integrity of the internal data structures. Callers should ensure | |
1130 | * that this function is *NOT* called under RCU protection or in contexts where | |
1131 | * mutex cannot be locked. | |
1132 | * | |
1133 | * Return: | |
1134 | * 0 On success OR | |
1135 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1136 | * -EEXIST Freq are same and volt are different OR | |
1137 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1138 | * -ENOMEM Memory allocation failure | |
1139 | */ | |
f47b72a1 VK |
1140 | int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, |
1141 | bool dynamic) | |
e1f60b29 | 1142 | { |
2c2709dc | 1143 | struct opp_table *opp_table; |
23dacf6d | 1144 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1145 | unsigned long tol; |
6ce4184d | 1146 | int ret; |
e1f60b29 | 1147 | |
2c2709dc VK |
1148 | /* Hold our table modification lock here */ |
1149 | mutex_lock(&opp_table_lock); | |
e1f60b29 | 1150 | |
2c2709dc | 1151 | new_opp = _allocate_opp(dev, &opp_table); |
23dacf6d VK |
1152 | if (!new_opp) { |
1153 | ret = -ENOMEM; | |
1154 | goto unlock; | |
1155 | } | |
1156 | ||
a7470db6 | 1157 | /* populate the opp table */ |
a7470db6 | 1158 | new_opp->rate = freq; |
2c2709dc | 1159 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
dfbe4678 VK |
1160 | new_opp->supplies[0].u_volt = u_volt; |
1161 | new_opp->supplies[0].u_volt_min = u_volt - tol; | |
1162 | new_opp->supplies[0].u_volt_max = u_volt + tol; | |
a7470db6 | 1163 | new_opp->available = true; |
23dacf6d | 1164 | new_opp->dynamic = dynamic; |
a7470db6 | 1165 | |
2c2709dc | 1166 | ret = _opp_add(dev, new_opp, opp_table); |
23dacf6d | 1167 | if (ret) |
6ce4184d | 1168 | goto free_opp; |
64ce8545 | 1169 | |
2c2709dc | 1170 | mutex_unlock(&opp_table_lock); |
e1f60b29 | 1171 | |
03ca370f MH |
1172 | /* |
1173 | * Notify the changes in the availability of the operable | |
1174 | * frequency/voltage list. | |
1175 | */ | |
2c2709dc | 1176 | srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1177 | return 0; |
6ce4184d VK |
1178 | |
1179 | free_opp: | |
2c2709dc | 1180 | _opp_remove(opp_table, new_opp, false); |
23dacf6d | 1181 | unlock: |
2c2709dc | 1182 | mutex_unlock(&opp_table_lock); |
6ce4184d | 1183 | return ret; |
e1f60b29 | 1184 | } |
38393409 | 1185 | |
7de36b0a VK |
1186 | /** |
1187 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1188 | * @dev: Device for which supported-hw has to be set. | |
1189 | * @versions: Array of hierarchy of versions to match. | |
1190 | * @count: Number of elements in the array. | |
1191 | * | |
1192 | * This is required only for the V2 bindings, and it enables a platform to | |
1193 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1194 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1195 | * property. | |
1196 | * | |
2c2709dc | 1197 | * Locking: The internal opp_table and opp structures are RCU protected. |
7de36b0a VK |
1198 | * Hence this function internally uses RCU updater strategy with mutex locks |
1199 | * to keep the integrity of the internal data structures. Callers should ensure | |
1200 | * that this function is *NOT* called under RCU protection or in contexts where | |
1201 | * mutex cannot be locked. | |
1202 | */ | |
1203 | int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, | |
1204 | unsigned int count) | |
1205 | { | |
2c2709dc | 1206 | struct opp_table *opp_table; |
7de36b0a VK |
1207 | int ret = 0; |
1208 | ||
2c2709dc VK |
1209 | /* Hold our table modification lock here */ |
1210 | mutex_lock(&opp_table_lock); | |
7de36b0a | 1211 | |
2c2709dc VK |
1212 | opp_table = _add_opp_table(dev); |
1213 | if (!opp_table) { | |
7de36b0a VK |
1214 | ret = -ENOMEM; |
1215 | goto unlock; | |
1216 | } | |
1217 | ||
2c2709dc VK |
1218 | /* Make sure there are no concurrent readers while updating opp_table */ |
1219 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1220 | |
2c2709dc VK |
1221 | /* Do we already have a version hierarchy associated with opp_table? */ |
1222 | if (opp_table->supported_hw) { | |
7de36b0a VK |
1223 | dev_err(dev, "%s: Already have supported hardware list\n", |
1224 | __func__); | |
1225 | ret = -EBUSY; | |
1226 | goto err; | |
1227 | } | |
1228 | ||
2c2709dc | 1229 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1230 | GFP_KERNEL); |
2c2709dc | 1231 | if (!opp_table->supported_hw) { |
7de36b0a VK |
1232 | ret = -ENOMEM; |
1233 | goto err; | |
1234 | } | |
1235 | ||
2c2709dc VK |
1236 | opp_table->supported_hw_count = count; |
1237 | mutex_unlock(&opp_table_lock); | |
7de36b0a VK |
1238 | return 0; |
1239 | ||
1240 | err: | |
2c2709dc | 1241 | _remove_opp_table(opp_table); |
7de36b0a | 1242 | unlock: |
2c2709dc | 1243 | mutex_unlock(&opp_table_lock); |
7de36b0a VK |
1244 | |
1245 | return ret; | |
1246 | } | |
1247 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1248 | ||
1249 | /** | |
1250 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
a5da6447 | 1251 | * @dev: Device for which supported-hw has to be put. |
7de36b0a VK |
1252 | * |
1253 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1254 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a VK |
1255 | * will not be freed. |
1256 | * | |
2c2709dc | 1257 | * Locking: The internal opp_table and opp structures are RCU protected. |
7de36b0a VK |
1258 | * Hence this function internally uses RCU updater strategy with mutex locks |
1259 | * to keep the integrity of the internal data structures. Callers should ensure | |
1260 | * that this function is *NOT* called under RCU protection or in contexts where | |
1261 | * mutex cannot be locked. | |
1262 | */ | |
1263 | void dev_pm_opp_put_supported_hw(struct device *dev) | |
1264 | { | |
2c2709dc | 1265 | struct opp_table *opp_table; |
7de36b0a | 1266 | |
2c2709dc VK |
1267 | /* Hold our table modification lock here */ |
1268 | mutex_lock(&opp_table_lock); | |
7de36b0a | 1269 | |
2c2709dc VK |
1270 | /* Check for existing table for 'dev' first */ |
1271 | opp_table = _find_opp_table(dev); | |
1272 | if (IS_ERR(opp_table)) { | |
1273 | dev_err(dev, "Failed to find opp_table: %ld\n", | |
1274 | PTR_ERR(opp_table)); | |
7de36b0a VK |
1275 | goto unlock; |
1276 | } | |
1277 | ||
2c2709dc VK |
1278 | /* Make sure there are no concurrent readers while updating opp_table */ |
1279 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1280 | |
2c2709dc | 1281 | if (!opp_table->supported_hw) { |
7de36b0a VK |
1282 | dev_err(dev, "%s: Doesn't have supported hardware list\n", |
1283 | __func__); | |
1284 | goto unlock; | |
1285 | } | |
1286 | ||
2c2709dc VK |
1287 | kfree(opp_table->supported_hw); |
1288 | opp_table->supported_hw = NULL; | |
1289 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1290 | |
2c2709dc VK |
1291 | /* Try freeing opp_table if this was the last blocking resource */ |
1292 | _remove_opp_table(opp_table); | |
7de36b0a VK |
1293 | |
1294 | unlock: | |
2c2709dc | 1295 | mutex_unlock(&opp_table_lock); |
7de36b0a VK |
1296 | } |
1297 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1298 | ||
01fb4d3c VK |
1299 | /** |
1300 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1301 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1302 | * @name: name to postfix to properties. |
1303 | * | |
1304 | * This is required only for the V2 bindings, and it enables a platform to | |
1305 | * specify the extn to be used for certain property names. The properties to | |
1306 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1307 | * should postfix the property name with -<name> while looking for them. | |
1308 | * | |
2c2709dc | 1309 | * Locking: The internal opp_table and opp structures are RCU protected. |
01fb4d3c VK |
1310 | * Hence this function internally uses RCU updater strategy with mutex locks |
1311 | * to keep the integrity of the internal data structures. Callers should ensure | |
1312 | * that this function is *NOT* called under RCU protection or in contexts where | |
1313 | * mutex cannot be locked. | |
1314 | */ | |
1315 | int dev_pm_opp_set_prop_name(struct device *dev, const char *name) | |
1316 | { | |
2c2709dc | 1317 | struct opp_table *opp_table; |
01fb4d3c VK |
1318 | int ret = 0; |
1319 | ||
2c2709dc VK |
1320 | /* Hold our table modification lock here */ |
1321 | mutex_lock(&opp_table_lock); | |
01fb4d3c | 1322 | |
2c2709dc VK |
1323 | opp_table = _add_opp_table(dev); |
1324 | if (!opp_table) { | |
01fb4d3c VK |
1325 | ret = -ENOMEM; |
1326 | goto unlock; | |
1327 | } | |
1328 | ||
2c2709dc VK |
1329 | /* Make sure there are no concurrent readers while updating opp_table */ |
1330 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1331 | |
2c2709dc VK |
1332 | /* Do we already have a prop-name associated with opp_table? */ |
1333 | if (opp_table->prop_name) { | |
01fb4d3c | 1334 | dev_err(dev, "%s: Already have prop-name %s\n", __func__, |
2c2709dc | 1335 | opp_table->prop_name); |
01fb4d3c VK |
1336 | ret = -EBUSY; |
1337 | goto err; | |
1338 | } | |
1339 | ||
2c2709dc VK |
1340 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1341 | if (!opp_table->prop_name) { | |
01fb4d3c VK |
1342 | ret = -ENOMEM; |
1343 | goto err; | |
1344 | } | |
1345 | ||
2c2709dc | 1346 | mutex_unlock(&opp_table_lock); |
01fb4d3c VK |
1347 | return 0; |
1348 | ||
1349 | err: | |
2c2709dc | 1350 | _remove_opp_table(opp_table); |
01fb4d3c | 1351 | unlock: |
2c2709dc | 1352 | mutex_unlock(&opp_table_lock); |
01fb4d3c VK |
1353 | |
1354 | return ret; | |
1355 | } | |
1356 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1357 | ||
1358 | /** | |
1359 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
a5da6447 | 1360 | * @dev: Device for which the prop-name has to be put. |
01fb4d3c VK |
1361 | * |
1362 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1363 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c VK |
1364 | * will not be freed. |
1365 | * | |
2c2709dc | 1366 | * Locking: The internal opp_table and opp structures are RCU protected. |
01fb4d3c VK |
1367 | * Hence this function internally uses RCU updater strategy with mutex locks |
1368 | * to keep the integrity of the internal data structures. Callers should ensure | |
1369 | * that this function is *NOT* called under RCU protection or in contexts where | |
1370 | * mutex cannot be locked. | |
1371 | */ | |
1372 | void dev_pm_opp_put_prop_name(struct device *dev) | |
1373 | { | |
2c2709dc | 1374 | struct opp_table *opp_table; |
01fb4d3c | 1375 | |
2c2709dc VK |
1376 | /* Hold our table modification lock here */ |
1377 | mutex_lock(&opp_table_lock); | |
01fb4d3c | 1378 | |
2c2709dc VK |
1379 | /* Check for existing table for 'dev' first */ |
1380 | opp_table = _find_opp_table(dev); | |
1381 | if (IS_ERR(opp_table)) { | |
1382 | dev_err(dev, "Failed to find opp_table: %ld\n", | |
1383 | PTR_ERR(opp_table)); | |
01fb4d3c VK |
1384 | goto unlock; |
1385 | } | |
1386 | ||
2c2709dc VK |
1387 | /* Make sure there are no concurrent readers while updating opp_table */ |
1388 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1389 | |
2c2709dc | 1390 | if (!opp_table->prop_name) { |
01fb4d3c VK |
1391 | dev_err(dev, "%s: Doesn't have a prop-name\n", __func__); |
1392 | goto unlock; | |
1393 | } | |
1394 | ||
2c2709dc VK |
1395 | kfree(opp_table->prop_name); |
1396 | opp_table->prop_name = NULL; | |
01fb4d3c | 1397 | |
2c2709dc VK |
1398 | /* Try freeing opp_table if this was the last blocking resource */ |
1399 | _remove_opp_table(opp_table); | |
01fb4d3c VK |
1400 | |
1401 | unlock: | |
2c2709dc | 1402 | mutex_unlock(&opp_table_lock); |
01fb4d3c VK |
1403 | } |
1404 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1405 | ||
94735585 VK |
1406 | static int _allocate_set_opp_data(struct opp_table *opp_table) |
1407 | { | |
1408 | struct dev_pm_set_opp_data *data; | |
1409 | int len, count = opp_table->regulator_count; | |
1410 | ||
1411 | if (WARN_ON(!count)) | |
1412 | return -EINVAL; | |
1413 | ||
1414 | /* space for set_opp_data */ | |
1415 | len = sizeof(*data); | |
1416 | ||
1417 | /* space for old_opp.supplies and new_opp.supplies */ | |
1418 | len += 2 * sizeof(struct dev_pm_opp_supply) * count; | |
1419 | ||
1420 | data = kzalloc(len, GFP_KERNEL); | |
1421 | if (!data) | |
1422 | return -ENOMEM; | |
1423 | ||
1424 | data->old_opp.supplies = (void *)(data + 1); | |
1425 | data->new_opp.supplies = data->old_opp.supplies + count; | |
1426 | ||
1427 | opp_table->set_opp_data = data; | |
1428 | ||
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | static void _free_set_opp_data(struct opp_table *opp_table) | |
1433 | { | |
1434 | kfree(opp_table->set_opp_data); | |
1435 | opp_table->set_opp_data = NULL; | |
1436 | } | |
1437 | ||
9f8ea969 | 1438 | /** |
dfbe4678 | 1439 | * dev_pm_opp_set_regulators() - Set regulator names for the device |
9f8ea969 | 1440 | * @dev: Device for which regulator name is being set. |
dfbe4678 VK |
1441 | * @names: Array of pointers to the names of the regulator. |
1442 | * @count: Number of regulators. | |
9f8ea969 VK |
1443 | * |
1444 | * In order to support OPP switching, OPP layer needs to know the name of the | |
dfbe4678 VK |
1445 | * device's regulators, as the core would be required to switch voltages as |
1446 | * well. | |
9f8ea969 VK |
1447 | * |
1448 | * This must be called before any OPPs are initialized for the device. | |
1449 | * | |
2c2709dc | 1450 | * Locking: The internal opp_table and opp structures are RCU protected. |
9f8ea969 VK |
1451 | * Hence this function internally uses RCU updater strategy with mutex locks |
1452 | * to keep the integrity of the internal data structures. Callers should ensure | |
1453 | * that this function is *NOT* called under RCU protection or in contexts where | |
1454 | * mutex cannot be locked. | |
1455 | */ | |
dfbe4678 VK |
1456 | struct opp_table *dev_pm_opp_set_regulators(struct device *dev, |
1457 | const char * const names[], | |
1458 | unsigned int count) | |
9f8ea969 | 1459 | { |
2c2709dc | 1460 | struct opp_table *opp_table; |
9f8ea969 | 1461 | struct regulator *reg; |
dfbe4678 | 1462 | int ret, i; |
9f8ea969 | 1463 | |
2c2709dc | 1464 | mutex_lock(&opp_table_lock); |
9f8ea969 | 1465 | |
2c2709dc VK |
1466 | opp_table = _add_opp_table(dev); |
1467 | if (!opp_table) { | |
9f8ea969 VK |
1468 | ret = -ENOMEM; |
1469 | goto unlock; | |
1470 | } | |
1471 | ||
1472 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1473 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1474 | ret = -EBUSY; |
1475 | goto err; | |
1476 | } | |
1477 | ||
dfbe4678 VK |
1478 | /* Already have regulators set */ |
1479 | if (WARN_ON(opp_table->regulators)) { | |
9f8ea969 VK |
1480 | ret = -EBUSY; |
1481 | goto err; | |
1482 | } | |
dfbe4678 VK |
1483 | |
1484 | opp_table->regulators = kmalloc_array(count, | |
1485 | sizeof(*opp_table->regulators), | |
1486 | GFP_KERNEL); | |
1487 | if (!opp_table->regulators) { | |
1488 | ret = -ENOMEM; | |
9f8ea969 VK |
1489 | goto err; |
1490 | } | |
1491 | ||
dfbe4678 VK |
1492 | for (i = 0; i < count; i++) { |
1493 | reg = regulator_get_optional(dev, names[i]); | |
1494 | if (IS_ERR(reg)) { | |
1495 | ret = PTR_ERR(reg); | |
1496 | if (ret != -EPROBE_DEFER) | |
1497 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
1498 | __func__, names[i], ret); | |
1499 | goto free_regulators; | |
1500 | } | |
1501 | ||
1502 | opp_table->regulators[i] = reg; | |
1503 | } | |
1504 | ||
1505 | opp_table->regulator_count = count; | |
9f8ea969 | 1506 | |
94735585 VK |
1507 | /* Allocate block only once to pass to set_opp() routines */ |
1508 | ret = _allocate_set_opp_data(opp_table); | |
1509 | if (ret) | |
1510 | goto free_regulators; | |
1511 | ||
2c2709dc | 1512 | mutex_unlock(&opp_table_lock); |
91291d9a | 1513 | return opp_table; |
9f8ea969 | 1514 | |
dfbe4678 VK |
1515 | free_regulators: |
1516 | while (i != 0) | |
1517 | regulator_put(opp_table->regulators[--i]); | |
1518 | ||
1519 | kfree(opp_table->regulators); | |
1520 | opp_table->regulators = NULL; | |
94735585 | 1521 | opp_table->regulator_count = 0; |
9f8ea969 | 1522 | err: |
2c2709dc | 1523 | _remove_opp_table(opp_table); |
9f8ea969 | 1524 | unlock: |
2c2709dc | 1525 | mutex_unlock(&opp_table_lock); |
9f8ea969 | 1526 | |
91291d9a | 1527 | return ERR_PTR(ret); |
9f8ea969 | 1528 | } |
dfbe4678 | 1529 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); |
9f8ea969 VK |
1530 | |
1531 | /** | |
dfbe4678 VK |
1532 | * dev_pm_opp_put_regulators() - Releases resources blocked for regulator |
1533 | * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). | |
9f8ea969 | 1534 | * |
2c2709dc | 1535 | * Locking: The internal opp_table and opp structures are RCU protected. |
9f8ea969 VK |
1536 | * Hence this function internally uses RCU updater strategy with mutex locks |
1537 | * to keep the integrity of the internal data structures. Callers should ensure | |
1538 | * that this function is *NOT* called under RCU protection or in contexts where | |
1539 | * mutex cannot be locked. | |
1540 | */ | |
dfbe4678 | 1541 | void dev_pm_opp_put_regulators(struct opp_table *opp_table) |
9f8ea969 | 1542 | { |
dfbe4678 VK |
1543 | int i; |
1544 | ||
2c2709dc | 1545 | mutex_lock(&opp_table_lock); |
9f8ea969 | 1546 | |
dfbe4678 VK |
1547 | if (!opp_table->regulators) { |
1548 | pr_err("%s: Doesn't have regulators set\n", __func__); | |
9f8ea969 VK |
1549 | goto unlock; |
1550 | } | |
1551 | ||
2c2709dc VK |
1552 | /* Make sure there are no concurrent readers while updating opp_table */ |
1553 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
9f8ea969 | 1554 | |
dfbe4678 VK |
1555 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
1556 | regulator_put(opp_table->regulators[i]); | |
1557 | ||
94735585 VK |
1558 | _free_set_opp_data(opp_table); |
1559 | ||
dfbe4678 VK |
1560 | kfree(opp_table->regulators); |
1561 | opp_table->regulators = NULL; | |
1562 | opp_table->regulator_count = 0; | |
9f8ea969 | 1563 | |
2c2709dc VK |
1564 | /* Try freeing opp_table if this was the last blocking resource */ |
1565 | _remove_opp_table(opp_table); | |
9f8ea969 VK |
1566 | |
1567 | unlock: | |
2c2709dc | 1568 | mutex_unlock(&opp_table_lock); |
9f8ea969 | 1569 | } |
dfbe4678 | 1570 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); |
9f8ea969 | 1571 | |
38393409 VK |
1572 | /** |
1573 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
1574 | * @dev: device for which we do this operation | |
1575 | * @freq: Frequency in Hz for this OPP | |
1576 | * @u_volt: Voltage in uVolts for this OPP | |
1577 | * | |
2c2709dc | 1578 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
1579 | * The opp is made available by default and it can be controlled using |
1580 | * dev_pm_opp_enable/disable functions. | |
1581 | * | |
2c2709dc | 1582 | * Locking: The internal opp_table and opp structures are RCU protected. |
38393409 VK |
1583 | * Hence this function internally uses RCU updater strategy with mutex locks |
1584 | * to keep the integrity of the internal data structures. Callers should ensure | |
1585 | * that this function is *NOT* called under RCU protection or in contexts where | |
1586 | * mutex cannot be locked. | |
1587 | * | |
1588 | * Return: | |
984f16c8 | 1589 | * 0 On success OR |
38393409 | 1590 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 1591 | * -EEXIST Freq are same and volt are different OR |
38393409 | 1592 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 1593 | * -ENOMEM Memory allocation failure |
38393409 VK |
1594 | */ |
1595 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
1596 | { | |
b64b9c3f | 1597 | return _opp_add_v1(dev, freq, u_volt, true); |
38393409 | 1598 | } |
5d4879cd | 1599 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
1600 | |
1601 | /** | |
327854c8 | 1602 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
1603 | * @dev: device for which we do this operation |
1604 | * @freq: OPP frequency to modify availability | |
1605 | * @availability_req: availability status requested for this opp | |
1606 | * | |
1607 | * Set the availability of an OPP with an RCU operation, opp_{enable,disable} | |
1608 | * share a common logic which is isolated here. | |
1609 | * | |
984f16c8 | 1610 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1611 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 NM |
1612 | * successful. |
1613 | * | |
2c2709dc | 1614 | * Locking: The internal opp_table and opp structures are RCU protected. |
e1f60b29 NM |
1615 | * Hence this function internally uses RCU updater strategy with mutex locks to |
1616 | * keep the integrity of the internal data structures. Callers should ensure | |
1617 | * that this function is *NOT* called under RCU protection or in contexts where | |
1618 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
1619 | */ | |
327854c8 NM |
1620 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
1621 | bool availability_req) | |
e1f60b29 | 1622 | { |
2c2709dc | 1623 | struct opp_table *opp_table; |
47d43ba7 | 1624 | struct dev_pm_opp *new_opp, *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
1625 | int r = 0; |
1626 | ||
1627 | /* keep the node allocated */ | |
47d43ba7 | 1628 | new_opp = kmalloc(sizeof(*new_opp), GFP_KERNEL); |
59d84ca8 | 1629 | if (!new_opp) |
e1f60b29 | 1630 | return -ENOMEM; |
e1f60b29 | 1631 | |
2c2709dc | 1632 | mutex_lock(&opp_table_lock); |
e1f60b29 | 1633 | |
2c2709dc VK |
1634 | /* Find the opp_table */ |
1635 | opp_table = _find_opp_table(dev); | |
1636 | if (IS_ERR(opp_table)) { | |
1637 | r = PTR_ERR(opp_table); | |
e1f60b29 NM |
1638 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
1639 | goto unlock; | |
1640 | } | |
1641 | ||
1642 | /* Do we have the frequency? */ | |
2c2709dc | 1643 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
1644 | if (tmp_opp->rate == freq) { |
1645 | opp = tmp_opp; | |
1646 | break; | |
1647 | } | |
1648 | } | |
1649 | if (IS_ERR(opp)) { | |
1650 | r = PTR_ERR(opp); | |
1651 | goto unlock; | |
1652 | } | |
1653 | ||
1654 | /* Is update really needed? */ | |
1655 | if (opp->available == availability_req) | |
1656 | goto unlock; | |
1657 | /* copy the old data over */ | |
1658 | *new_opp = *opp; | |
1659 | ||
1660 | /* plug in new node */ | |
1661 | new_opp->available = availability_req; | |
1662 | ||
1663 | list_replace_rcu(&opp->node, &new_opp->node); | |
2c2709dc VK |
1664 | mutex_unlock(&opp_table_lock); |
1665 | call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu); | |
e1f60b29 | 1666 | |
03ca370f MH |
1667 | /* Notify the change of the OPP availability */ |
1668 | if (availability_req) | |
2c2709dc VK |
1669 | srcu_notifier_call_chain(&opp_table->srcu_head, |
1670 | OPP_EVENT_ENABLE, new_opp); | |
03ca370f | 1671 | else |
2c2709dc VK |
1672 | srcu_notifier_call_chain(&opp_table->srcu_head, |
1673 | OPP_EVENT_DISABLE, new_opp); | |
03ca370f | 1674 | |
dde8437d | 1675 | return 0; |
e1f60b29 NM |
1676 | |
1677 | unlock: | |
2c2709dc | 1678 | mutex_unlock(&opp_table_lock); |
e1f60b29 NM |
1679 | kfree(new_opp); |
1680 | return r; | |
1681 | } | |
1682 | ||
1683 | /** | |
5d4879cd | 1684 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
1685 | * @dev: device for which we do this operation |
1686 | * @freq: OPP frequency to enable | |
1687 | * | |
1688 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
1689 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 1690 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 1691 | * |
2c2709dc | 1692 | * Locking: The internal opp_table and opp structures are RCU protected. |
e1f60b29 NM |
1693 | * Hence this function indirectly uses RCU and mutex locks to keep the |
1694 | * integrity of the internal data structures. Callers should ensure that | |
1695 | * this function is *NOT* called under RCU protection or in contexts where | |
1696 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
984f16c8 NM |
1697 | * |
1698 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
e1a2d49c | 1699 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1700 | * successful. |
e1f60b29 | 1701 | */ |
5d4879cd | 1702 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 1703 | { |
327854c8 | 1704 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 1705 | } |
5d4879cd | 1706 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
1707 | |
1708 | /** | |
5d4879cd | 1709 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
1710 | * @dev: device for which we do this operation |
1711 | * @freq: OPP frequency to disable | |
1712 | * | |
1713 | * Disables a provided opp. If the operation is valid, this returns | |
1714 | * 0, else the corresponding error value. It is meant to be a temporary | |
1715 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 1716 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 1717 | * |
2c2709dc | 1718 | * Locking: The internal opp_table and opp structures are RCU protected. |
e1f60b29 NM |
1719 | * Hence this function indirectly uses RCU and mutex locks to keep the |
1720 | * integrity of the internal data structures. Callers should ensure that | |
1721 | * this function is *NOT* called under RCU protection or in contexts where | |
1722 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
984f16c8 NM |
1723 | * |
1724 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
e1a2d49c | 1725 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1726 | * successful. |
e1f60b29 | 1727 | */ |
5d4879cd | 1728 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 1729 | { |
327854c8 | 1730 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 1731 | } |
5d4879cd | 1732 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 1733 | |
03ca370f | 1734 | /** |
5d4879cd | 1735 | * dev_pm_opp_get_notifier() - find notifier_head of the device with opp |
2c2709dc | 1736 | * @dev: device pointer used to lookup OPP table. |
984f16c8 NM |
1737 | * |
1738 | * Return: pointer to notifier head if found, otherwise -ENODEV or | |
1739 | * -EINVAL based on type of error casted as pointer. value must be checked | |
1740 | * with IS_ERR to determine valid pointer or error result. | |
1741 | * | |
2c2709dc VK |
1742 | * Locking: This function must be called under rcu_read_lock(). opp_table is a |
1743 | * RCU protected pointer. The reason for the same is that the opp pointer which | |
1744 | * is returned will remain valid for use with opp_get_{voltage, freq} only while | |
984f16c8 NM |
1745 | * under the locked area. The pointer returned must be used prior to unlocking |
1746 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
03ca370f | 1747 | */ |
5d4879cd | 1748 | struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev) |
03ca370f | 1749 | { |
2c2709dc | 1750 | struct opp_table *opp_table = _find_opp_table(dev); |
03ca370f | 1751 | |
2c2709dc VK |
1752 | if (IS_ERR(opp_table)) |
1753 | return ERR_CAST(opp_table); /* matching type */ | |
03ca370f | 1754 | |
2c2709dc | 1755 | return &opp_table->srcu_head; |
03ca370f | 1756 | } |
4679ec37 | 1757 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier); |
b496dfbc | 1758 | |
411466c5 SH |
1759 | /* |
1760 | * Free OPPs either created using static entries present in DT or even the | |
1761 | * dynamically added entries based on remove_all param. | |
b496dfbc | 1762 | */ |
f47b72a1 | 1763 | void _dev_pm_opp_remove_table(struct device *dev, bool remove_all) |
737002b5 | 1764 | { |
2c2709dc | 1765 | struct opp_table *opp_table; |
737002b5 VK |
1766 | struct dev_pm_opp *opp, *tmp; |
1767 | ||
2c2709dc VK |
1768 | /* Hold our table modification lock here */ |
1769 | mutex_lock(&opp_table_lock); | |
06441658 | 1770 | |
2c2709dc VK |
1771 | /* Check for existing table for 'dev' */ |
1772 | opp_table = _find_opp_table(dev); | |
1773 | if (IS_ERR(opp_table)) { | |
1774 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
1775 | |
1776 | if (error != -ENODEV) | |
2c2709dc | 1777 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
1778 | IS_ERR_OR_NULL(dev) ? |
1779 | "Invalid device" : dev_name(dev), | |
1780 | error); | |
06441658 | 1781 | goto unlock; |
737002b5 VK |
1782 | } |
1783 | ||
2c2709dc VK |
1784 | /* Find if opp_table manages a single device */ |
1785 | if (list_is_singular(&opp_table->dev_list)) { | |
06441658 | 1786 | /* Free static OPPs */ |
2c2709dc | 1787 | list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { |
411466c5 | 1788 | if (remove_all || !opp->dynamic) |
2c2709dc | 1789 | _opp_remove(opp_table, opp, true); |
06441658 VK |
1790 | } |
1791 | } else { | |
2c2709dc | 1792 | _remove_opp_dev(_find_opp_dev(dev, opp_table), opp_table); |
737002b5 VK |
1793 | } |
1794 | ||
06441658 | 1795 | unlock: |
2c2709dc | 1796 | mutex_unlock(&opp_table_lock); |
737002b5 | 1797 | } |
129eec55 VK |
1798 | |
1799 | /** | |
411466c5 | 1800 | * dev_pm_opp_remove_table() - Free all OPPs associated with the device |
2c2709dc | 1801 | * @dev: device pointer used to lookup OPP table. |
129eec55 | 1802 | * |
411466c5 SH |
1803 | * Free both OPPs created using static entries present in DT and the |
1804 | * dynamically added entries. | |
984f16c8 | 1805 | * |
2c2709dc | 1806 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
1807 | * Hence this function indirectly uses RCU updater strategy with mutex locks |
1808 | * to keep the integrity of the internal data structures. Callers should ensure | |
1809 | * that this function is *NOT* called under RCU protection or in contexts where | |
1810 | * mutex cannot be locked. | |
129eec55 | 1811 | */ |
411466c5 | 1812 | void dev_pm_opp_remove_table(struct device *dev) |
129eec55 | 1813 | { |
411466c5 | 1814 | _dev_pm_opp_remove_table(dev, true); |
8d4d4e98 | 1815 | } |
411466c5 | 1816 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |