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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> |
b496dfbc | 21 | #include <linux/of.h> |
80126ce7 | 22 | #include <linux/export.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 | */ | |
2c2709dc | 32 | static 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 | |
b02ded24 DT |
36 | #define opp_rcu_lockdep_assert() \ |
37 | do { \ | |
f78f5b90 | 38 | RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \ |
2c2709dc VK |
39 | !lockdep_is_held(&opp_table_lock), \ |
40 | "Missing rcu_read_lock() or " \ | |
41 | "opp_table_lock protection"); \ | |
b02ded24 DT |
42 | } while (0) |
43 | ||
2c2709dc VK |
44 | static struct opp_device *_find_opp_dev(const struct device *dev, |
45 | struct opp_table *opp_table) | |
06441658 | 46 | { |
2c2709dc | 47 | struct opp_device *opp_dev; |
06441658 | 48 | |
2c2709dc VK |
49 | list_for_each_entry(opp_dev, &opp_table->dev_list, node) |
50 | if (opp_dev->dev == dev) | |
51 | return opp_dev; | |
06441658 VK |
52 | |
53 | return NULL; | |
54 | } | |
55 | ||
2c2709dc | 56 | static struct opp_table *_managed_opp(const struct device_node *np) |
06441658 | 57 | { |
2c2709dc | 58 | struct opp_table *opp_table; |
06441658 | 59 | |
2c2709dc VK |
60 | list_for_each_entry_rcu(opp_table, &opp_tables, node) { |
61 | if (opp_table->np == np) { | |
06441658 VK |
62 | /* |
63 | * Multiple devices can point to the same OPP table and | |
64 | * so will have same node-pointer, np. | |
65 | * | |
66 | * But the OPPs will be considered as shared only if the | |
67 | * OPP table contains a "opp-shared" property. | |
68 | */ | |
2c2709dc | 69 | return opp_table->shared_opp ? opp_table : NULL; |
06441658 VK |
70 | } |
71 | } | |
72 | ||
73 | return NULL; | |
74 | } | |
75 | ||
e1f60b29 | 76 | /** |
2c2709dc VK |
77 | * _find_opp_table() - find opp_table struct using device pointer |
78 | * @dev: device pointer used to lookup OPP table | |
e1f60b29 | 79 | * |
2c2709dc VK |
80 | * Search OPP table for one containing matching device. Does a RCU reader |
81 | * operation to grab the pointer needed. | |
e1f60b29 | 82 | * |
2c2709dc | 83 | * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or |
e1f60b29 NM |
84 | * -EINVAL based on type of error. |
85 | * | |
0597e818 | 86 | * Locking: For readers, this function must be called under rcu_read_lock(). |
2c2709dc | 87 | * opp_table is a RCU protected pointer, which means that opp_table is valid |
0597e818 VK |
88 | * as long as we are under RCU lock. |
89 | * | |
2c2709dc | 90 | * For Writers, this function must be called with opp_table_lock held. |
e1f60b29 | 91 | */ |
2c2709dc | 92 | struct opp_table *_find_opp_table(struct device *dev) |
e1f60b29 | 93 | { |
2c2709dc | 94 | struct opp_table *opp_table; |
e1f60b29 | 95 | |
0597e818 VK |
96 | opp_rcu_lockdep_assert(); |
97 | ||
50a3cb04 | 98 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
99 | pr_err("%s: Invalid parameters\n", __func__); |
100 | return ERR_PTR(-EINVAL); | |
101 | } | |
102 | ||
2c2709dc VK |
103 | list_for_each_entry_rcu(opp_table, &opp_tables, node) |
104 | if (_find_opp_dev(dev, opp_table)) | |
105 | return opp_table; | |
e1f60b29 | 106 | |
06441658 | 107 | return ERR_PTR(-ENODEV); |
e1f60b29 NM |
108 | } |
109 | ||
110 | /** | |
d6d00742 | 111 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
112 | * @opp: opp for which voltage has to be returned for |
113 | * | |
984f16c8 | 114 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
115 | * return 0 |
116 | * | |
117 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
118 | * protected pointer. This means that opp which could have been fetched by | |
119 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
120 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
121 | * used in the same section as the usage of this function with the pointer | |
122 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
123 | * pointer. | |
124 | */ | |
47d43ba7 | 125 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 126 | { |
47d43ba7 | 127 | struct dev_pm_opp *tmp_opp; |
e1f60b29 NM |
128 | unsigned long v = 0; |
129 | ||
04bf1c7f KK |
130 | opp_rcu_lockdep_assert(); |
131 | ||
e1f60b29 | 132 | tmp_opp = rcu_dereference(opp); |
d6d00742 | 133 | if (IS_ERR_OR_NULL(tmp_opp)) |
e1f60b29 NM |
134 | pr_err("%s: Invalid parameters\n", __func__); |
135 | else | |
136 | v = tmp_opp->u_volt; | |
137 | ||
138 | return v; | |
139 | } | |
5d4879cd | 140 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
141 | |
142 | /** | |
5d4879cd | 143 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
144 | * @opp: opp for which frequency has to be returned for |
145 | * | |
984f16c8 | 146 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 NM |
147 | * return 0 |
148 | * | |
149 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
150 | * protected pointer. This means that opp which could have been fetched by | |
151 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
152 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
153 | * used in the same section as the usage of this function with the pointer | |
154 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
155 | * pointer. | |
156 | */ | |
47d43ba7 | 157 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 158 | { |
47d43ba7 | 159 | struct dev_pm_opp *tmp_opp; |
e1f60b29 NM |
160 | unsigned long f = 0; |
161 | ||
04bf1c7f KK |
162 | opp_rcu_lockdep_assert(); |
163 | ||
e1f60b29 | 164 | tmp_opp = rcu_dereference(opp); |
50a3cb04 | 165 | if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available) |
e1f60b29 NM |
166 | pr_err("%s: Invalid parameters\n", __func__); |
167 | else | |
168 | f = tmp_opp->rate; | |
169 | ||
170 | return f; | |
171 | } | |
5d4879cd | 172 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 173 | |
19445b25 BZ |
174 | /** |
175 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
176 | * @opp: opp for which turbo mode is being verified | |
177 | * | |
178 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
179 | * conditions) for short duration of times to finish high throughput work | |
180 | * quickly. Running on them for longer times may overheat the chip. | |
181 | * | |
182 | * Return: true if opp is turbo opp, else false. | |
183 | * | |
184 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
185 | * protected pointer. This means that opp which could have been fetched by | |
186 | * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are | |
187 | * under RCU lock. The pointer returned by the opp_find_freq family must be | |
188 | * used in the same section as the usage of this function with the pointer | |
189 | * prior to unlocking with rcu_read_unlock() to maintain the integrity of the | |
190 | * pointer. | |
191 | */ | |
192 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
193 | { | |
194 | struct dev_pm_opp *tmp_opp; | |
195 | ||
196 | opp_rcu_lockdep_assert(); | |
197 | ||
198 | tmp_opp = rcu_dereference(opp); | |
199 | if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available) { | |
200 | pr_err("%s: Invalid parameters\n", __func__); | |
201 | return false; | |
202 | } | |
203 | ||
204 | return tmp_opp->turbo; | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
207 | ||
3ca9bb33 VK |
208 | /** |
209 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
210 | * @dev: device for which we do this operation | |
211 | * | |
212 | * Return: This function returns the max clock latency in nanoseconds. | |
213 | * | |
214 | * Locking: This function takes rcu_read_lock(). | |
215 | */ | |
216 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
217 | { | |
2c2709dc | 218 | struct opp_table *opp_table; |
3ca9bb33 VK |
219 | unsigned long clock_latency_ns; |
220 | ||
221 | rcu_read_lock(); | |
222 | ||
2c2709dc VK |
223 | opp_table = _find_opp_table(dev); |
224 | if (IS_ERR(opp_table)) | |
3ca9bb33 VK |
225 | clock_latency_ns = 0; |
226 | else | |
2c2709dc | 227 | clock_latency_ns = opp_table->clock_latency_ns_max; |
3ca9bb33 VK |
228 | |
229 | rcu_read_unlock(); | |
230 | return clock_latency_ns; | |
231 | } | |
232 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
233 | ||
655c9df9 VK |
234 | /** |
235 | * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds | |
236 | * @dev: device for which we do this operation | |
237 | * | |
238 | * Return: This function returns the max voltage latency in nanoseconds. | |
239 | * | |
240 | * Locking: This function takes rcu_read_lock(). | |
241 | */ | |
242 | unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) | |
243 | { | |
2c2709dc | 244 | struct opp_table *opp_table; |
655c9df9 VK |
245 | struct dev_pm_opp *opp; |
246 | struct regulator *reg; | |
247 | unsigned long latency_ns = 0; | |
248 | unsigned long min_uV = ~0, max_uV = 0; | |
249 | int ret; | |
250 | ||
251 | rcu_read_lock(); | |
252 | ||
2c2709dc VK |
253 | opp_table = _find_opp_table(dev); |
254 | if (IS_ERR(opp_table)) { | |
655c9df9 VK |
255 | rcu_read_unlock(); |
256 | return 0; | |
257 | } | |
258 | ||
2c2709dc | 259 | reg = opp_table->regulator; |
0c717d0f | 260 | if (IS_ERR(reg)) { |
655c9df9 | 261 | /* Regulator may not be required for device */ |
655c9df9 VK |
262 | rcu_read_unlock(); |
263 | return 0; | |
264 | } | |
265 | ||
2c2709dc | 266 | list_for_each_entry_rcu(opp, &opp_table->opp_list, node) { |
655c9df9 VK |
267 | if (!opp->available) |
268 | continue; | |
269 | ||
270 | if (opp->u_volt_min < min_uV) | |
271 | min_uV = opp->u_volt_min; | |
272 | if (opp->u_volt_max > max_uV) | |
273 | max_uV = opp->u_volt_max; | |
274 | } | |
275 | ||
276 | rcu_read_unlock(); | |
277 | ||
278 | /* | |
2c2709dc | 279 | * The caller needs to ensure that opp_table (and hence the regulator) |
655c9df9 VK |
280 | * isn't freed, while we are executing this routine. |
281 | */ | |
282 | ret = regulator_set_voltage_time(reg, min_uV, max_uV); | |
283 | if (ret > 0) | |
284 | latency_ns = ret * 1000; | |
285 | ||
286 | return latency_ns; | |
287 | } | |
288 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); | |
289 | ||
21743447 VK |
290 | /** |
291 | * dev_pm_opp_get_max_transition_latency() - Get max transition latency in | |
292 | * nanoseconds | |
293 | * @dev: device for which we do this operation | |
294 | * | |
295 | * Return: This function returns the max transition latency, in nanoseconds, to | |
296 | * switch from one OPP to other. | |
297 | * | |
298 | * Locking: This function takes rcu_read_lock(). | |
299 | */ | |
300 | unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) | |
301 | { | |
302 | return dev_pm_opp_get_max_volt_latency(dev) + | |
303 | dev_pm_opp_get_max_clock_latency(dev); | |
304 | } | |
305 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); | |
306 | ||
4eafbd15 BZ |
307 | /** |
308 | * dev_pm_opp_get_suspend_opp() - Get suspend opp | |
309 | * @dev: device for which we do this operation | |
310 | * | |
311 | * Return: This function returns pointer to the suspend opp if it is | |
1b2b90cb | 312 | * defined and available, otherwise it returns NULL. |
4eafbd15 BZ |
313 | * |
314 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
315 | * protected pointer. The reason for the same is that the opp pointer which is | |
316 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
317 | * under the locked area. The pointer returned must be used prior to unlocking | |
318 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
319 | */ | |
320 | struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev) | |
321 | { | |
2c2709dc | 322 | struct opp_table *opp_table; |
4eafbd15 BZ |
323 | |
324 | opp_rcu_lockdep_assert(); | |
325 | ||
2c2709dc VK |
326 | opp_table = _find_opp_table(dev); |
327 | if (IS_ERR(opp_table) || !opp_table->suspend_opp || | |
328 | !opp_table->suspend_opp->available) | |
1b2b90cb | 329 | return NULL; |
4eafbd15 | 330 | |
2c2709dc | 331 | return opp_table->suspend_opp; |
4eafbd15 BZ |
332 | } |
333 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp); | |
334 | ||
e1f60b29 | 335 | /** |
2c2709dc | 336 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table |
e1f60b29 NM |
337 | * @dev: device for which we do this operation |
338 | * | |
984f16c8 | 339 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 NM |
340 | * else returns 0 if none or the corresponding error value. |
341 | * | |
b4718c02 | 342 | * Locking: This function takes rcu_read_lock(). |
e1f60b29 | 343 | */ |
5d4879cd | 344 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 | 345 | { |
2c2709dc | 346 | struct opp_table *opp_table; |
47d43ba7 | 347 | struct dev_pm_opp *temp_opp; |
e1f60b29 NM |
348 | int count = 0; |
349 | ||
b4718c02 | 350 | rcu_read_lock(); |
b02ded24 | 351 | |
2c2709dc VK |
352 | opp_table = _find_opp_table(dev); |
353 | if (IS_ERR(opp_table)) { | |
354 | count = PTR_ERR(opp_table); | |
355 | dev_err(dev, "%s: OPP table not found (%d)\n", | |
b4718c02 DT |
356 | __func__, count); |
357 | goto out_unlock; | |
e1f60b29 NM |
358 | } |
359 | ||
2c2709dc | 360 | list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
361 | if (temp_opp->available) |
362 | count++; | |
363 | } | |
364 | ||
b4718c02 DT |
365 | out_unlock: |
366 | rcu_read_unlock(); | |
e1f60b29 NM |
367 | return count; |
368 | } | |
5d4879cd | 369 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
370 | |
371 | /** | |
5d4879cd | 372 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
373 | * @dev: device for which we do this operation |
374 | * @freq: frequency to search for | |
7ae49618 | 375 | * @available: true/false - match for available opp |
e1f60b29 | 376 | * |
2c2709dc | 377 | * Return: Searches for exact match in the opp table and returns pointer to the |
984f16c8 NM |
378 | * matching opp if found, else returns ERR_PTR in case of error and should |
379 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
380 | * EINVAL: for bad pointer |
381 | * ERANGE: no match found for search | |
382 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
383 | * |
384 | * Note: available is a modifier for the search. if available=true, then the | |
385 | * match is for exact matching frequency and is available in the stored OPP | |
386 | * table. if false, the match is for exact frequency which is not available. | |
387 | * | |
388 | * This provides a mechanism to enable an opp which is not available currently | |
389 | * or the opposite as well. | |
390 | * | |
391 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
392 | * protected pointer. The reason for the same is that the opp pointer which is | |
393 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
394 | * under the locked area. The pointer returned must be used prior to unlocking | |
395 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
396 | */ | |
47d43ba7 NM |
397 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
398 | unsigned long freq, | |
399 | bool available) | |
e1f60b29 | 400 | { |
2c2709dc | 401 | struct opp_table *opp_table; |
47d43ba7 | 402 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 403 | |
b02ded24 DT |
404 | opp_rcu_lockdep_assert(); |
405 | ||
2c2709dc VK |
406 | opp_table = _find_opp_table(dev); |
407 | if (IS_ERR(opp_table)) { | |
408 | int r = PTR_ERR(opp_table); | |
409 | ||
410 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
e1f60b29 NM |
411 | return ERR_PTR(r); |
412 | } | |
413 | ||
2c2709dc | 414 | list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
415 | if (temp_opp->available == available && |
416 | temp_opp->rate == freq) { | |
417 | opp = temp_opp; | |
418 | break; | |
419 | } | |
420 | } | |
421 | ||
422 | return opp; | |
423 | } | |
5d4879cd | 424 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 NM |
425 | |
426 | /** | |
5d4879cd | 427 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
428 | * @dev: device for which we do this operation |
429 | * @freq: Start frequency | |
430 | * | |
431 | * Search for the matching ceil *available* OPP from a starting freq | |
432 | * for a device. | |
433 | * | |
984f16c8 | 434 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
435 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
436 | * values can be: | |
437 | * EINVAL: for bad pointer | |
438 | * ERANGE: no match found for search | |
439 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
440 | * |
441 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
442 | * protected pointer. The reason for the same is that the opp pointer which is | |
443 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
444 | * under the locked area. The pointer returned must be used prior to unlocking | |
445 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
446 | */ | |
47d43ba7 NM |
447 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
448 | unsigned long *freq) | |
e1f60b29 | 449 | { |
2c2709dc | 450 | struct opp_table *opp_table; |
47d43ba7 | 451 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 452 | |
b02ded24 DT |
453 | opp_rcu_lockdep_assert(); |
454 | ||
e1f60b29 NM |
455 | if (!dev || !freq) { |
456 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
457 | return ERR_PTR(-EINVAL); | |
458 | } | |
459 | ||
2c2709dc VK |
460 | opp_table = _find_opp_table(dev); |
461 | if (IS_ERR(opp_table)) | |
462 | return ERR_CAST(opp_table); | |
e1f60b29 | 463 | |
2c2709dc | 464 | list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
465 | if (temp_opp->available && temp_opp->rate >= *freq) { |
466 | opp = temp_opp; | |
467 | *freq = opp->rate; | |
468 | break; | |
469 | } | |
470 | } | |
471 | ||
472 | return opp; | |
473 | } | |
5d4879cd | 474 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
475 | |
476 | /** | |
5d4879cd | 477 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
478 | * @dev: device for which we do this operation |
479 | * @freq: Start frequency | |
480 | * | |
481 | * Search for the matching floor *available* OPP from a starting freq | |
482 | * for a device. | |
483 | * | |
984f16c8 | 484 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
485 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
486 | * values can be: | |
487 | * EINVAL: for bad pointer | |
488 | * ERANGE: no match found for search | |
489 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
490 | * |
491 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu | |
492 | * protected pointer. The reason for the same is that the opp pointer which is | |
493 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
494 | * under the locked area. The pointer returned must be used prior to unlocking | |
495 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
496 | */ | |
47d43ba7 NM |
497 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
498 | unsigned long *freq) | |
e1f60b29 | 499 | { |
2c2709dc | 500 | struct opp_table *opp_table; |
47d43ba7 | 501 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 502 | |
b02ded24 DT |
503 | opp_rcu_lockdep_assert(); |
504 | ||
e1f60b29 NM |
505 | if (!dev || !freq) { |
506 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
507 | return ERR_PTR(-EINVAL); | |
508 | } | |
509 | ||
2c2709dc VK |
510 | opp_table = _find_opp_table(dev); |
511 | if (IS_ERR(opp_table)) | |
512 | return ERR_CAST(opp_table); | |
e1f60b29 | 513 | |
2c2709dc | 514 | list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
515 | if (temp_opp->available) { |
516 | /* go to the next node, before choosing prev */ | |
517 | if (temp_opp->rate > *freq) | |
518 | break; | |
519 | else | |
520 | opp = temp_opp; | |
521 | } | |
522 | } | |
523 | if (!IS_ERR(opp)) | |
524 | *freq = opp->rate; | |
525 | ||
526 | return opp; | |
527 | } | |
5d4879cd | 528 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 529 | |
6a0712f6 | 530 | /* |
2c2709dc | 531 | * The caller needs to ensure that opp_table (and hence the clk) isn't freed, |
6a0712f6 VK |
532 | * while clk returned here is used. |
533 | */ | |
534 | static struct clk *_get_opp_clk(struct device *dev) | |
535 | { | |
2c2709dc | 536 | struct opp_table *opp_table; |
6a0712f6 VK |
537 | struct clk *clk; |
538 | ||
539 | rcu_read_lock(); | |
540 | ||
2c2709dc VK |
541 | opp_table = _find_opp_table(dev); |
542 | if (IS_ERR(opp_table)) { | |
6a0712f6 | 543 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); |
2c2709dc | 544 | clk = ERR_CAST(opp_table); |
6a0712f6 VK |
545 | goto unlock; |
546 | } | |
547 | ||
2c2709dc | 548 | clk = opp_table->clk; |
6a0712f6 VK |
549 | if (IS_ERR(clk)) |
550 | dev_err(dev, "%s: No clock available for the device\n", | |
551 | __func__); | |
552 | ||
553 | unlock: | |
554 | rcu_read_unlock(); | |
555 | return clk; | |
556 | } | |
557 | ||
558 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, | |
559 | unsigned long u_volt, unsigned long u_volt_min, | |
560 | unsigned long u_volt_max) | |
561 | { | |
562 | int ret; | |
563 | ||
564 | /* Regulator not available for device */ | |
565 | if (IS_ERR(reg)) { | |
566 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
567 | PTR_ERR(reg)); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, u_volt_min, | |
572 | u_volt, u_volt_max); | |
573 | ||
574 | ret = regulator_set_voltage_triplet(reg, u_volt_min, u_volt, | |
575 | u_volt_max); | |
576 | if (ret) | |
577 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
578 | __func__, u_volt_min, u_volt, u_volt_max, ret); | |
579 | ||
580 | return ret; | |
581 | } | |
582 | ||
583 | /** | |
584 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
585 | * @dev: device for which we do this operation | |
586 | * @target_freq: frequency to achieve | |
587 | * | |
588 | * This configures the power-supplies and clock source to the levels specified | |
589 | * by the OPP corresponding to the target_freq. | |
590 | * | |
591 | * Locking: This function takes rcu_read_lock(). | |
592 | */ | |
593 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
594 | { | |
2c2709dc | 595 | struct opp_table *opp_table; |
6a0712f6 VK |
596 | struct dev_pm_opp *old_opp, *opp; |
597 | struct regulator *reg; | |
598 | struct clk *clk; | |
599 | unsigned long freq, old_freq; | |
600 | unsigned long u_volt, u_volt_min, u_volt_max; | |
601 | unsigned long ou_volt, ou_volt_min, ou_volt_max; | |
602 | int ret; | |
603 | ||
604 | if (unlikely(!target_freq)) { | |
605 | dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, | |
606 | target_freq); | |
607 | return -EINVAL; | |
608 | } | |
609 | ||
610 | clk = _get_opp_clk(dev); | |
611 | if (IS_ERR(clk)) | |
612 | return PTR_ERR(clk); | |
613 | ||
614 | freq = clk_round_rate(clk, target_freq); | |
615 | if ((long)freq <= 0) | |
616 | freq = target_freq; | |
617 | ||
618 | old_freq = clk_get_rate(clk); | |
619 | ||
620 | /* Return early if nothing to do */ | |
621 | if (old_freq == freq) { | |
622 | dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", | |
623 | __func__, freq); | |
624 | return 0; | |
625 | } | |
626 | ||
627 | rcu_read_lock(); | |
628 | ||
2c2709dc VK |
629 | opp_table = _find_opp_table(dev); |
630 | if (IS_ERR(opp_table)) { | |
6a0712f6 VK |
631 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); |
632 | rcu_read_unlock(); | |
2c2709dc | 633 | return PTR_ERR(opp_table); |
6a0712f6 VK |
634 | } |
635 | ||
636 | old_opp = dev_pm_opp_find_freq_ceil(dev, &old_freq); | |
637 | if (!IS_ERR(old_opp)) { | |
638 | ou_volt = old_opp->u_volt; | |
639 | ou_volt_min = old_opp->u_volt_min; | |
640 | ou_volt_max = old_opp->u_volt_max; | |
641 | } else { | |
642 | dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", | |
643 | __func__, old_freq, PTR_ERR(old_opp)); | |
644 | } | |
645 | ||
646 | opp = dev_pm_opp_find_freq_ceil(dev, &freq); | |
647 | if (IS_ERR(opp)) { | |
648 | ret = PTR_ERR(opp); | |
649 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
650 | __func__, freq, ret); | |
651 | rcu_read_unlock(); | |
652 | return ret; | |
653 | } | |
654 | ||
655 | u_volt = opp->u_volt; | |
656 | u_volt_min = opp->u_volt_min; | |
657 | u_volt_max = opp->u_volt_max; | |
658 | ||
2c2709dc | 659 | reg = opp_table->regulator; |
6a0712f6 VK |
660 | |
661 | rcu_read_unlock(); | |
662 | ||
663 | /* Scaling up? Scale voltage before frequency */ | |
664 | if (freq > old_freq) { | |
665 | ret = _set_opp_voltage(dev, reg, u_volt, u_volt_min, | |
666 | u_volt_max); | |
667 | if (ret) | |
668 | goto restore_voltage; | |
669 | } | |
670 | ||
671 | /* Change frequency */ | |
672 | ||
673 | dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", | |
674 | __func__, old_freq, freq); | |
675 | ||
676 | ret = clk_set_rate(clk, freq); | |
677 | if (ret) { | |
678 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
679 | ret); | |
680 | goto restore_voltage; | |
681 | } | |
682 | ||
683 | /* Scaling down? Scale voltage after frequency */ | |
684 | if (freq < old_freq) { | |
685 | ret = _set_opp_voltage(dev, reg, u_volt, u_volt_min, | |
686 | u_volt_max); | |
687 | if (ret) | |
688 | goto restore_freq; | |
689 | } | |
690 | ||
691 | return 0; | |
692 | ||
693 | restore_freq: | |
694 | if (clk_set_rate(clk, old_freq)) | |
695 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", | |
696 | __func__, old_freq); | |
697 | restore_voltage: | |
698 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
699 | if (!IS_ERR(old_opp)) | |
700 | _set_opp_voltage(dev, reg, ou_volt, ou_volt_min, ou_volt_max); | |
701 | ||
702 | return ret; | |
703 | } | |
704 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
705 | ||
2c2709dc VK |
706 | /* OPP-dev Helpers */ |
707 | static void _kfree_opp_dev_rcu(struct rcu_head *head) | |
06441658 | 708 | { |
2c2709dc | 709 | struct opp_device *opp_dev; |
06441658 | 710 | |
2c2709dc VK |
711 | opp_dev = container_of(head, struct opp_device, rcu_head); |
712 | kfree_rcu(opp_dev, rcu_head); | |
06441658 VK |
713 | } |
714 | ||
2c2709dc VK |
715 | static void _remove_opp_dev(struct opp_device *opp_dev, |
716 | struct opp_table *opp_table) | |
06441658 | 717 | { |
2c2709dc VK |
718 | opp_debug_unregister(opp_dev, opp_table); |
719 | list_del(&opp_dev->node); | |
720 | call_srcu(&opp_table->srcu_head.srcu, &opp_dev->rcu_head, | |
721 | _kfree_opp_dev_rcu); | |
06441658 VK |
722 | } |
723 | ||
2c2709dc VK |
724 | struct opp_device *_add_opp_dev(const struct device *dev, |
725 | struct opp_table *opp_table) | |
06441658 | 726 | { |
2c2709dc | 727 | struct opp_device *opp_dev; |
deaa5146 | 728 | int ret; |
06441658 | 729 | |
2c2709dc VK |
730 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
731 | if (!opp_dev) | |
06441658 VK |
732 | return NULL; |
733 | ||
2c2709dc VK |
734 | /* Initialize opp-dev */ |
735 | opp_dev->dev = dev; | |
736 | list_add_rcu(&opp_dev->node, &opp_table->dev_list); | |
06441658 | 737 | |
2c2709dc VK |
738 | /* Create debugfs entries for the opp_table */ |
739 | ret = opp_debug_register(opp_dev, opp_table); | |
deaa5146 VK |
740 | if (ret) |
741 | dev_err(dev, "%s: Failed to register opp debugfs (%d)\n", | |
742 | __func__, ret); | |
743 | ||
2c2709dc | 744 | return opp_dev; |
06441658 VK |
745 | } |
746 | ||
984f16c8 | 747 | /** |
2c2709dc | 748 | * _add_opp_table() - Find OPP table or allocate a new one |
984f16c8 NM |
749 | * @dev: device for which we do this operation |
750 | * | |
aa5f2f85 VK |
751 | * It tries to find an existing table first, if it couldn't find one, it |
752 | * allocates a new OPP table and returns that. | |
984f16c8 | 753 | * |
2c2709dc | 754 | * Return: valid opp_table pointer if success, else NULL. |
984f16c8 | 755 | */ |
2c2709dc | 756 | static struct opp_table *_add_opp_table(struct device *dev) |
07cce74a | 757 | { |
2c2709dc VK |
758 | struct opp_table *opp_table; |
759 | struct opp_device *opp_dev; | |
50f8cfbd | 760 | struct device_node *np; |
d54974c2 | 761 | int ret; |
07cce74a | 762 | |
2c2709dc VK |
763 | /* Check for existing table for 'dev' first */ |
764 | opp_table = _find_opp_table(dev); | |
765 | if (!IS_ERR(opp_table)) | |
766 | return opp_table; | |
07cce74a VK |
767 | |
768 | /* | |
2c2709dc | 769 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
770 | * device is needed to be added, we pay this penalty. |
771 | */ | |
2c2709dc VK |
772 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
773 | if (!opp_table) | |
07cce74a VK |
774 | return NULL; |
775 | ||
2c2709dc | 776 | INIT_LIST_HEAD(&opp_table->dev_list); |
06441658 | 777 | |
2c2709dc VK |
778 | opp_dev = _add_opp_dev(dev, opp_table); |
779 | if (!opp_dev) { | |
780 | kfree(opp_table); | |
06441658 VK |
781 | return NULL; |
782 | } | |
783 | ||
50f8cfbd VK |
784 | /* |
785 | * Only required for backward compatibility with v1 bindings, but isn't | |
786 | * harmful for other cases. And so we do it unconditionally. | |
787 | */ | |
788 | np = of_node_get(dev->of_node); | |
789 | if (np) { | |
790 | u32 val; | |
791 | ||
792 | if (!of_property_read_u32(np, "clock-latency", &val)) | |
2c2709dc | 793 | opp_table->clock_latency_ns_max = val; |
50f8cfbd | 794 | of_property_read_u32(np, "voltage-tolerance", |
2c2709dc | 795 | &opp_table->voltage_tolerance_v1); |
50f8cfbd VK |
796 | of_node_put(np); |
797 | } | |
798 | ||
0c717d0f | 799 | /* Set regulator to a non-NULL error value */ |
2c2709dc | 800 | opp_table->regulator = ERR_PTR(-ENXIO); |
0c717d0f | 801 | |
d54974c2 | 802 | /* Find clk for the device */ |
2c2709dc VK |
803 | opp_table->clk = clk_get(dev, NULL); |
804 | if (IS_ERR(opp_table->clk)) { | |
805 | ret = PTR_ERR(opp_table->clk); | |
d54974c2 VK |
806 | if (ret != -EPROBE_DEFER) |
807 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, | |
808 | ret); | |
809 | } | |
810 | ||
2c2709dc VK |
811 | srcu_init_notifier_head(&opp_table->srcu_head); |
812 | INIT_LIST_HEAD(&opp_table->opp_list); | |
07cce74a | 813 | |
2c2709dc VK |
814 | /* Secure the device table modification */ |
815 | list_add_rcu(&opp_table->node, &opp_tables); | |
816 | return opp_table; | |
07cce74a VK |
817 | } |
818 | ||
984f16c8 | 819 | /** |
2c2709dc | 820 | * _kfree_device_rcu() - Free opp_table RCU handler |
737002b5 | 821 | * @head: RCU head |
984f16c8 | 822 | */ |
737002b5 | 823 | static void _kfree_device_rcu(struct rcu_head *head) |
e1f60b29 | 824 | { |
2c2709dc VK |
825 | struct opp_table *opp_table = container_of(head, struct opp_table, |
826 | rcu_head); | |
6ce4184d | 827 | |
2c2709dc | 828 | kfree_rcu(opp_table, rcu_head); |
e1f60b29 | 829 | } |
38393409 VK |
830 | |
831 | /** | |
2c2709dc VK |
832 | * _remove_opp_table() - Removes a OPP table |
833 | * @opp_table: OPP table to be removed. | |
38393409 | 834 | * |
2c2709dc | 835 | * Removes/frees OPP table if it doesn't contain any OPPs. |
38393409 | 836 | */ |
2c2709dc | 837 | static void _remove_opp_table(struct opp_table *opp_table) |
38393409 | 838 | { |
2c2709dc | 839 | struct opp_device *opp_dev; |
06441658 | 840 | |
2c2709dc | 841 | if (!list_empty(&opp_table->opp_list)) |
3bac42ca VK |
842 | return; |
843 | ||
2c2709dc | 844 | if (opp_table->supported_hw) |
7de36b0a VK |
845 | return; |
846 | ||
2c2709dc | 847 | if (opp_table->prop_name) |
01fb4d3c VK |
848 | return; |
849 | ||
2c2709dc | 850 | if (!IS_ERR(opp_table->regulator)) |
9f8ea969 VK |
851 | return; |
852 | ||
d54974c2 | 853 | /* Release clk */ |
2c2709dc VK |
854 | if (!IS_ERR(opp_table->clk)) |
855 | clk_put(opp_table->clk); | |
d54974c2 | 856 | |
2c2709dc VK |
857 | opp_dev = list_first_entry(&opp_table->dev_list, struct opp_device, |
858 | node); | |
06441658 | 859 | |
2c2709dc | 860 | _remove_opp_dev(opp_dev, opp_table); |
06441658 VK |
861 | |
862 | /* dev_list must be empty now */ | |
2c2709dc | 863 | WARN_ON(!list_empty(&opp_table->dev_list)); |
06441658 | 864 | |
2c2709dc VK |
865 | list_del_rcu(&opp_table->node); |
866 | call_srcu(&opp_table->srcu_head.srcu, &opp_table->rcu_head, | |
3bac42ca | 867 | _kfree_device_rcu); |
38393409 | 868 | } |
e1f60b29 | 869 | |
984f16c8 NM |
870 | /** |
871 | * _kfree_opp_rcu() - Free OPP RCU handler | |
872 | * @head: RCU head | |
873 | */ | |
327854c8 | 874 | static void _kfree_opp_rcu(struct rcu_head *head) |
129eec55 VK |
875 | { |
876 | struct dev_pm_opp *opp = container_of(head, struct dev_pm_opp, rcu_head); | |
877 | ||
878 | kfree_rcu(opp, rcu_head); | |
879 | } | |
880 | ||
984f16c8 NM |
881 | /** |
882 | * _opp_remove() - Remove an OPP from a table definition | |
2c2709dc | 883 | * @opp_table: points back to the opp_table struct this opp belongs to |
984f16c8 | 884 | * @opp: pointer to the OPP to remove |
23dacf6d | 885 | * @notify: OPP_EVENT_REMOVE notification should be sent or not |
984f16c8 | 886 | * |
2c2709dc | 887 | * This function removes an opp definition from the opp table. |
984f16c8 | 888 | * |
2c2709dc | 889 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
890 | * It is assumed that the caller holds required mutex for an RCU updater |
891 | * strategy. | |
892 | */ | |
2c2709dc | 893 | static void _opp_remove(struct opp_table *opp_table, |
23dacf6d | 894 | struct dev_pm_opp *opp, bool notify) |
129eec55 VK |
895 | { |
896 | /* | |
897 | * Notify the changes in the availability of the operable | |
898 | * frequency/voltage list. | |
899 | */ | |
23dacf6d | 900 | if (notify) |
2c2709dc VK |
901 | srcu_notifier_call_chain(&opp_table->srcu_head, |
902 | OPP_EVENT_REMOVE, opp); | |
deaa5146 | 903 | opp_debug_remove_one(opp); |
129eec55 | 904 | list_del_rcu(&opp->node); |
2c2709dc | 905 | call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu); |
129eec55 | 906 | |
2c2709dc | 907 | _remove_opp_table(opp_table); |
129eec55 VK |
908 | } |
909 | ||
910 | /** | |
2c2709dc | 911 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
912 | * @dev: device for which we do this operation |
913 | * @freq: OPP to remove with matching 'freq' | |
914 | * | |
2c2709dc | 915 | * This function removes an opp from the opp table. |
984f16c8 | 916 | * |
2c2709dc | 917 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
918 | * Hence this function internally uses RCU updater strategy with mutex locks |
919 | * to keep the integrity of the internal data structures. Callers should ensure | |
920 | * that this function is *NOT* called under RCU protection or in contexts where | |
921 | * mutex cannot be locked. | |
129eec55 VK |
922 | */ |
923 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
924 | { | |
925 | struct dev_pm_opp *opp; | |
2c2709dc | 926 | struct opp_table *opp_table; |
129eec55 VK |
927 | bool found = false; |
928 | ||
2c2709dc VK |
929 | /* Hold our table modification lock here */ |
930 | mutex_lock(&opp_table_lock); | |
129eec55 | 931 | |
2c2709dc VK |
932 | opp_table = _find_opp_table(dev); |
933 | if (IS_ERR(opp_table)) | |
129eec55 VK |
934 | goto unlock; |
935 | ||
2c2709dc | 936 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
937 | if (opp->rate == freq) { |
938 | found = true; | |
939 | break; | |
940 | } | |
941 | } | |
942 | ||
943 | if (!found) { | |
944 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", | |
945 | __func__, freq); | |
946 | goto unlock; | |
947 | } | |
948 | ||
2c2709dc | 949 | _opp_remove(opp_table, opp, true); |
129eec55 | 950 | unlock: |
2c2709dc | 951 | mutex_unlock(&opp_table_lock); |
129eec55 VK |
952 | } |
953 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
954 | ||
23dacf6d | 955 | static struct dev_pm_opp *_allocate_opp(struct device *dev, |
2c2709dc | 956 | struct opp_table **opp_table) |
e1f60b29 | 957 | { |
23dacf6d | 958 | struct dev_pm_opp *opp; |
e1f60b29 | 959 | |
23dacf6d VK |
960 | /* allocate new OPP node */ |
961 | opp = kzalloc(sizeof(*opp), GFP_KERNEL); | |
962 | if (!opp) | |
963 | return NULL; | |
e1f60b29 | 964 | |
23dacf6d | 965 | INIT_LIST_HEAD(&opp->node); |
e1f60b29 | 966 | |
2c2709dc VK |
967 | *opp_table = _add_opp_table(dev); |
968 | if (!*opp_table) { | |
23dacf6d VK |
969 | kfree(opp); |
970 | return NULL; | |
971 | } | |
972 | ||
973 | return opp; | |
974 | } | |
975 | ||
7d34d56e | 976 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 977 | struct opp_table *opp_table) |
7d34d56e | 978 | { |
2c2709dc | 979 | struct regulator *reg = opp_table->regulator; |
7d34d56e | 980 | |
0c717d0f | 981 | if (!IS_ERR(reg) && |
7d34d56e VK |
982 | !regulator_is_supported_voltage(reg, opp->u_volt_min, |
983 | opp->u_volt_max)) { | |
984 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
985 | __func__, opp->u_volt_min, opp->u_volt_max); | |
986 | return false; | |
987 | } | |
988 | ||
989 | return true; | |
990 | } | |
991 | ||
06441658 | 992 | static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, |
2c2709dc | 993 | struct opp_table *opp_table) |
23dacf6d VK |
994 | { |
995 | struct dev_pm_opp *opp; | |
2c2709dc | 996 | struct list_head *head = &opp_table->opp_list; |
deaa5146 | 997 | int ret; |
23dacf6d VK |
998 | |
999 | /* | |
1000 | * Insert new OPP in order of increasing frequency and discard if | |
1001 | * already present. | |
1002 | * | |
2c2709dc | 1003 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
1004 | * loop, don't replace it with head otherwise it will become an infinite |
1005 | * loop. | |
1006 | */ | |
2c2709dc | 1007 | list_for_each_entry_rcu(opp, &opp_table->opp_list, node) { |
23dacf6d VK |
1008 | if (new_opp->rate > opp->rate) { |
1009 | head = &opp->node; | |
1010 | continue; | |
1011 | } | |
1012 | ||
1013 | if (new_opp->rate < opp->rate) | |
1014 | break; | |
1015 | ||
1016 | /* Duplicate OPPs */ | |
06441658 | 1017 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
23dacf6d VK |
1018 | __func__, opp->rate, opp->u_volt, opp->available, |
1019 | new_opp->rate, new_opp->u_volt, new_opp->available); | |
1020 | ||
1021 | return opp->available && new_opp->u_volt == opp->u_volt ? | |
1022 | 0 : -EEXIST; | |
1023 | } | |
1024 | ||
2c2709dc | 1025 | new_opp->opp_table = opp_table; |
23dacf6d VK |
1026 | list_add_rcu(&new_opp->node, head); |
1027 | ||
2c2709dc | 1028 | ret = opp_debug_create_one(new_opp, opp_table); |
deaa5146 VK |
1029 | if (ret) |
1030 | dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n", | |
1031 | __func__, ret); | |
1032 | ||
2c2709dc | 1033 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1034 | new_opp->available = false; |
1035 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1036 | __func__, new_opp->rate); | |
1037 | } | |
1038 | ||
23dacf6d VK |
1039 | return 0; |
1040 | } | |
1041 | ||
984f16c8 | 1042 | /** |
b64b9c3f | 1043 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
984f16c8 NM |
1044 | * @dev: device for which we do this operation |
1045 | * @freq: Frequency in Hz for this OPP | |
1046 | * @u_volt: Voltage in uVolts for this OPP | |
1047 | * @dynamic: Dynamically added OPPs. | |
1048 | * | |
2c2709dc | 1049 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1050 | * The opp is made available by default and it can be controlled using |
1051 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1052 | * | |
8f8d37b2 VK |
1053 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1054 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1055 | * |
2c2709dc | 1056 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
1057 | * Hence this function internally uses RCU updater strategy with mutex locks |
1058 | * to keep the integrity of the internal data structures. Callers should ensure | |
1059 | * that this function is *NOT* called under RCU protection or in contexts where | |
1060 | * mutex cannot be locked. | |
1061 | * | |
1062 | * Return: | |
1063 | * 0 On success OR | |
1064 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1065 | * -EEXIST Freq are same and volt are different OR | |
1066 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1067 | * -ENOMEM Memory allocation failure | |
1068 | */ | |
b64b9c3f VK |
1069 | static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, |
1070 | bool dynamic) | |
e1f60b29 | 1071 | { |
2c2709dc | 1072 | struct opp_table *opp_table; |
23dacf6d | 1073 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1074 | unsigned long tol; |
6ce4184d | 1075 | int ret; |
e1f60b29 | 1076 | |
2c2709dc VK |
1077 | /* Hold our table modification lock here */ |
1078 | mutex_lock(&opp_table_lock); | |
e1f60b29 | 1079 | |
2c2709dc | 1080 | new_opp = _allocate_opp(dev, &opp_table); |
23dacf6d VK |
1081 | if (!new_opp) { |
1082 | ret = -ENOMEM; | |
1083 | goto unlock; | |
1084 | } | |
1085 | ||
a7470db6 | 1086 | /* populate the opp table */ |
a7470db6 | 1087 | new_opp->rate = freq; |
2c2709dc | 1088 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
a7470db6 | 1089 | new_opp->u_volt = u_volt; |
50f8cfbd VK |
1090 | new_opp->u_volt_min = u_volt - tol; |
1091 | new_opp->u_volt_max = u_volt + tol; | |
a7470db6 | 1092 | new_opp->available = true; |
23dacf6d | 1093 | new_opp->dynamic = dynamic; |
a7470db6 | 1094 | |
2c2709dc | 1095 | ret = _opp_add(dev, new_opp, opp_table); |
23dacf6d | 1096 | if (ret) |
6ce4184d | 1097 | goto free_opp; |
64ce8545 | 1098 | |
2c2709dc | 1099 | mutex_unlock(&opp_table_lock); |
e1f60b29 | 1100 | |
03ca370f MH |
1101 | /* |
1102 | * Notify the changes in the availability of the operable | |
1103 | * frequency/voltage list. | |
1104 | */ | |
2c2709dc | 1105 | srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1106 | return 0; |
6ce4184d VK |
1107 | |
1108 | free_opp: | |
2c2709dc | 1109 | _opp_remove(opp_table, new_opp, false); |
23dacf6d | 1110 | unlock: |
2c2709dc | 1111 | mutex_unlock(&opp_table_lock); |
6ce4184d | 1112 | return ret; |
e1f60b29 | 1113 | } |
38393409 | 1114 | |
27465902 | 1115 | /* TODO: Support multiple regulators */ |
01fb4d3c | 1116 | static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, |
2c2709dc | 1117 | struct opp_table *opp_table) |
27465902 VK |
1118 | { |
1119 | u32 microvolt[3] = {0}; | |
ad623c31 | 1120 | u32 val; |
27465902 | 1121 | int count, ret; |
01fb4d3c VK |
1122 | struct property *prop = NULL; |
1123 | char name[NAME_MAX]; | |
1124 | ||
1125 | /* Search for "opp-microvolt-<name>" */ | |
2c2709dc | 1126 | if (opp_table->prop_name) { |
5ff24d60 | 1127 | snprintf(name, sizeof(name), "opp-microvolt-%s", |
2c2709dc | 1128 | opp_table->prop_name); |
01fb4d3c VK |
1129 | prop = of_find_property(opp->np, name, NULL); |
1130 | } | |
1131 | ||
1132 | if (!prop) { | |
1133 | /* Search for "opp-microvolt" */ | |
fd8d8e63 | 1134 | sprintf(name, "opp-microvolt"); |
01fb4d3c | 1135 | prop = of_find_property(opp->np, name, NULL); |
27465902 | 1136 | |
01fb4d3c VK |
1137 | /* Missing property isn't a problem, but an invalid entry is */ |
1138 | if (!prop) | |
1139 | return 0; | |
1140 | } | |
27465902 | 1141 | |
01fb4d3c | 1142 | count = of_property_count_u32_elems(opp->np, name); |
680168a5 | 1143 | if (count < 0) { |
01fb4d3c VK |
1144 | dev_err(dev, "%s: Invalid %s property (%d)\n", |
1145 | __func__, name, count); | |
680168a5 VK |
1146 | return count; |
1147 | } | |
1148 | ||
27465902 VK |
1149 | /* There can be one or three elements here */ |
1150 | if (count != 1 && count != 3) { | |
01fb4d3c VK |
1151 | dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n", |
1152 | __func__, name, count); | |
27465902 VK |
1153 | return -EINVAL; |
1154 | } | |
1155 | ||
01fb4d3c | 1156 | ret = of_property_read_u32_array(opp->np, name, microvolt, count); |
27465902 | 1157 | if (ret) { |
01fb4d3c | 1158 | dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); |
27465902 VK |
1159 | return -EINVAL; |
1160 | } | |
1161 | ||
1162 | opp->u_volt = microvolt[0]; | |
c88c395f VK |
1163 | |
1164 | if (count == 1) { | |
1165 | opp->u_volt_min = opp->u_volt; | |
1166 | opp->u_volt_max = opp->u_volt; | |
1167 | } else { | |
1168 | opp->u_volt_min = microvolt[1]; | |
1169 | opp->u_volt_max = microvolt[2]; | |
1170 | } | |
27465902 | 1171 | |
01fb4d3c VK |
1172 | /* Search for "opp-microamp-<name>" */ |
1173 | prop = NULL; | |
2c2709dc | 1174 | if (opp_table->prop_name) { |
5ff24d60 | 1175 | snprintf(name, sizeof(name), "opp-microamp-%s", |
2c2709dc | 1176 | opp_table->prop_name); |
01fb4d3c VK |
1177 | prop = of_find_property(opp->np, name, NULL); |
1178 | } | |
1179 | ||
1180 | if (!prop) { | |
1181 | /* Search for "opp-microamp" */ | |
fd8d8e63 | 1182 | sprintf(name, "opp-microamp"); |
01fb4d3c VK |
1183 | prop = of_find_property(opp->np, name, NULL); |
1184 | } | |
1185 | ||
1186 | if (prop && !of_property_read_u32(opp->np, name, &val)) | |
ad623c31 VK |
1187 | opp->u_amp = val; |
1188 | ||
27465902 VK |
1189 | return 0; |
1190 | } | |
1191 | ||
7de36b0a VK |
1192 | /** |
1193 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1194 | * @dev: Device for which supported-hw has to be set. | |
1195 | * @versions: Array of hierarchy of versions to match. | |
1196 | * @count: Number of elements in the array. | |
1197 | * | |
1198 | * This is required only for the V2 bindings, and it enables a platform to | |
1199 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1200 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1201 | * property. | |
1202 | * | |
2c2709dc | 1203 | * Locking: The internal opp_table and opp structures are RCU protected. |
7de36b0a VK |
1204 | * Hence this function internally uses RCU updater strategy with mutex locks |
1205 | * to keep the integrity of the internal data structures. Callers should ensure | |
1206 | * that this function is *NOT* called under RCU protection or in contexts where | |
1207 | * mutex cannot be locked. | |
1208 | */ | |
1209 | int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, | |
1210 | unsigned int count) | |
1211 | { | |
2c2709dc | 1212 | struct opp_table *opp_table; |
7de36b0a VK |
1213 | int ret = 0; |
1214 | ||
2c2709dc VK |
1215 | /* Hold our table modification lock here */ |
1216 | mutex_lock(&opp_table_lock); | |
7de36b0a | 1217 | |
2c2709dc VK |
1218 | opp_table = _add_opp_table(dev); |
1219 | if (!opp_table) { | |
7de36b0a VK |
1220 | ret = -ENOMEM; |
1221 | goto unlock; | |
1222 | } | |
1223 | ||
2c2709dc VK |
1224 | /* Make sure there are no concurrent readers while updating opp_table */ |
1225 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1226 | |
2c2709dc VK |
1227 | /* Do we already have a version hierarchy associated with opp_table? */ |
1228 | if (opp_table->supported_hw) { | |
7de36b0a VK |
1229 | dev_err(dev, "%s: Already have supported hardware list\n", |
1230 | __func__); | |
1231 | ret = -EBUSY; | |
1232 | goto err; | |
1233 | } | |
1234 | ||
2c2709dc | 1235 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1236 | GFP_KERNEL); |
2c2709dc | 1237 | if (!opp_table->supported_hw) { |
7de36b0a VK |
1238 | ret = -ENOMEM; |
1239 | goto err; | |
1240 | } | |
1241 | ||
2c2709dc VK |
1242 | opp_table->supported_hw_count = count; |
1243 | mutex_unlock(&opp_table_lock); | |
7de36b0a VK |
1244 | return 0; |
1245 | ||
1246 | err: | |
2c2709dc | 1247 | _remove_opp_table(opp_table); |
7de36b0a | 1248 | unlock: |
2c2709dc | 1249 | mutex_unlock(&opp_table_lock); |
7de36b0a VK |
1250 | |
1251 | return ret; | |
1252 | } | |
1253 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1254 | ||
1255 | /** | |
1256 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
a5da6447 | 1257 | * @dev: Device for which supported-hw has to be put. |
7de36b0a VK |
1258 | * |
1259 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1260 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a VK |
1261 | * will not be freed. |
1262 | * | |
2c2709dc | 1263 | * Locking: The internal opp_table and opp structures are RCU protected. |
7de36b0a VK |
1264 | * Hence this function internally uses RCU updater strategy with mutex locks |
1265 | * to keep the integrity of the internal data structures. Callers should ensure | |
1266 | * that this function is *NOT* called under RCU protection or in contexts where | |
1267 | * mutex cannot be locked. | |
1268 | */ | |
1269 | void dev_pm_opp_put_supported_hw(struct device *dev) | |
1270 | { | |
2c2709dc | 1271 | struct opp_table *opp_table; |
7de36b0a | 1272 | |
2c2709dc VK |
1273 | /* Hold our table modification lock here */ |
1274 | mutex_lock(&opp_table_lock); | |
7de36b0a | 1275 | |
2c2709dc VK |
1276 | /* Check for existing table for 'dev' first */ |
1277 | opp_table = _find_opp_table(dev); | |
1278 | if (IS_ERR(opp_table)) { | |
1279 | dev_err(dev, "Failed to find opp_table: %ld\n", | |
1280 | PTR_ERR(opp_table)); | |
7de36b0a VK |
1281 | goto unlock; |
1282 | } | |
1283 | ||
2c2709dc VK |
1284 | /* Make sure there are no concurrent readers while updating opp_table */ |
1285 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1286 | |
2c2709dc | 1287 | if (!opp_table->supported_hw) { |
7de36b0a VK |
1288 | dev_err(dev, "%s: Doesn't have supported hardware list\n", |
1289 | __func__); | |
1290 | goto unlock; | |
1291 | } | |
1292 | ||
2c2709dc VK |
1293 | kfree(opp_table->supported_hw); |
1294 | opp_table->supported_hw = NULL; | |
1295 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1296 | |
2c2709dc VK |
1297 | /* Try freeing opp_table if this was the last blocking resource */ |
1298 | _remove_opp_table(opp_table); | |
7de36b0a VK |
1299 | |
1300 | unlock: | |
2c2709dc | 1301 | mutex_unlock(&opp_table_lock); |
7de36b0a VK |
1302 | } |
1303 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1304 | ||
01fb4d3c VK |
1305 | /** |
1306 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1307 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1308 | * @name: name to postfix to properties. |
1309 | * | |
1310 | * This is required only for the V2 bindings, and it enables a platform to | |
1311 | * specify the extn to be used for certain property names. The properties to | |
1312 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1313 | * should postfix the property name with -<name> while looking for them. | |
1314 | * | |
2c2709dc | 1315 | * Locking: The internal opp_table and opp structures are RCU protected. |
01fb4d3c VK |
1316 | * Hence this function internally uses RCU updater strategy with mutex locks |
1317 | * to keep the integrity of the internal data structures. Callers should ensure | |
1318 | * that this function is *NOT* called under RCU protection or in contexts where | |
1319 | * mutex cannot be locked. | |
1320 | */ | |
1321 | int dev_pm_opp_set_prop_name(struct device *dev, const char *name) | |
1322 | { | |
2c2709dc | 1323 | struct opp_table *opp_table; |
01fb4d3c VK |
1324 | int ret = 0; |
1325 | ||
2c2709dc VK |
1326 | /* Hold our table modification lock here */ |
1327 | mutex_lock(&opp_table_lock); | |
01fb4d3c | 1328 | |
2c2709dc VK |
1329 | opp_table = _add_opp_table(dev); |
1330 | if (!opp_table) { | |
01fb4d3c VK |
1331 | ret = -ENOMEM; |
1332 | goto unlock; | |
1333 | } | |
1334 | ||
2c2709dc VK |
1335 | /* Make sure there are no concurrent readers while updating opp_table */ |
1336 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1337 | |
2c2709dc VK |
1338 | /* Do we already have a prop-name associated with opp_table? */ |
1339 | if (opp_table->prop_name) { | |
01fb4d3c | 1340 | dev_err(dev, "%s: Already have prop-name %s\n", __func__, |
2c2709dc | 1341 | opp_table->prop_name); |
01fb4d3c VK |
1342 | ret = -EBUSY; |
1343 | goto err; | |
1344 | } | |
1345 | ||
2c2709dc VK |
1346 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1347 | if (!opp_table->prop_name) { | |
01fb4d3c VK |
1348 | ret = -ENOMEM; |
1349 | goto err; | |
1350 | } | |
1351 | ||
2c2709dc | 1352 | mutex_unlock(&opp_table_lock); |
01fb4d3c VK |
1353 | return 0; |
1354 | ||
1355 | err: | |
2c2709dc | 1356 | _remove_opp_table(opp_table); |
01fb4d3c | 1357 | unlock: |
2c2709dc | 1358 | mutex_unlock(&opp_table_lock); |
01fb4d3c VK |
1359 | |
1360 | return ret; | |
1361 | } | |
1362 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1363 | ||
1364 | /** | |
1365 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
a5da6447 | 1366 | * @dev: Device for which the prop-name has to be put. |
01fb4d3c VK |
1367 | * |
1368 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1369 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c VK |
1370 | * will not be freed. |
1371 | * | |
2c2709dc | 1372 | * Locking: The internal opp_table and opp structures are RCU protected. |
01fb4d3c VK |
1373 | * Hence this function internally uses RCU updater strategy with mutex locks |
1374 | * to keep the integrity of the internal data structures. Callers should ensure | |
1375 | * that this function is *NOT* called under RCU protection or in contexts where | |
1376 | * mutex cannot be locked. | |
1377 | */ | |
1378 | void dev_pm_opp_put_prop_name(struct device *dev) | |
1379 | { | |
2c2709dc | 1380 | struct opp_table *opp_table; |
01fb4d3c | 1381 | |
2c2709dc VK |
1382 | /* Hold our table modification lock here */ |
1383 | mutex_lock(&opp_table_lock); | |
01fb4d3c | 1384 | |
2c2709dc VK |
1385 | /* Check for existing table for 'dev' first */ |
1386 | opp_table = _find_opp_table(dev); | |
1387 | if (IS_ERR(opp_table)) { | |
1388 | dev_err(dev, "Failed to find opp_table: %ld\n", | |
1389 | PTR_ERR(opp_table)); | |
01fb4d3c VK |
1390 | goto unlock; |
1391 | } | |
1392 | ||
2c2709dc VK |
1393 | /* Make sure there are no concurrent readers while updating opp_table */ |
1394 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1395 | |
2c2709dc | 1396 | if (!opp_table->prop_name) { |
01fb4d3c VK |
1397 | dev_err(dev, "%s: Doesn't have a prop-name\n", __func__); |
1398 | goto unlock; | |
1399 | } | |
1400 | ||
2c2709dc VK |
1401 | kfree(opp_table->prop_name); |
1402 | opp_table->prop_name = NULL; | |
01fb4d3c | 1403 | |
2c2709dc VK |
1404 | /* Try freeing opp_table if this was the last blocking resource */ |
1405 | _remove_opp_table(opp_table); | |
01fb4d3c VK |
1406 | |
1407 | unlock: | |
2c2709dc | 1408 | mutex_unlock(&opp_table_lock); |
01fb4d3c VK |
1409 | } |
1410 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1411 | ||
9f8ea969 VK |
1412 | /** |
1413 | * dev_pm_opp_set_regulator() - Set regulator name for the device | |
1414 | * @dev: Device for which regulator name is being set. | |
1415 | * @name: Name of the regulator. | |
1416 | * | |
1417 | * In order to support OPP switching, OPP layer needs to know the name of the | |
1418 | * device's regulator, as the core would be required to switch voltages as well. | |
1419 | * | |
1420 | * This must be called before any OPPs are initialized for the device. | |
1421 | * | |
2c2709dc | 1422 | * Locking: The internal opp_table and opp structures are RCU protected. |
9f8ea969 VK |
1423 | * Hence this function internally uses RCU updater strategy with mutex locks |
1424 | * to keep the integrity of the internal data structures. Callers should ensure | |
1425 | * that this function is *NOT* called under RCU protection or in contexts where | |
1426 | * mutex cannot be locked. | |
1427 | */ | |
1428 | int dev_pm_opp_set_regulator(struct device *dev, const char *name) | |
1429 | { | |
2c2709dc | 1430 | struct opp_table *opp_table; |
9f8ea969 VK |
1431 | struct regulator *reg; |
1432 | int ret; | |
1433 | ||
2c2709dc | 1434 | mutex_lock(&opp_table_lock); |
9f8ea969 | 1435 | |
2c2709dc VK |
1436 | opp_table = _add_opp_table(dev); |
1437 | if (!opp_table) { | |
9f8ea969 VK |
1438 | ret = -ENOMEM; |
1439 | goto unlock; | |
1440 | } | |
1441 | ||
1442 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1443 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1444 | ret = -EBUSY; |
1445 | goto err; | |
1446 | } | |
1447 | ||
1448 | /* Already have a regulator set */ | |
2c2709dc | 1449 | if (WARN_ON(!IS_ERR(opp_table->regulator))) { |
9f8ea969 VK |
1450 | ret = -EBUSY; |
1451 | goto err; | |
1452 | } | |
1453 | /* Allocate the regulator */ | |
1454 | reg = regulator_get_optional(dev, name); | |
1455 | if (IS_ERR(reg)) { | |
1456 | ret = PTR_ERR(reg); | |
1457 | if (ret != -EPROBE_DEFER) | |
1458 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
1459 | __func__, name, ret); | |
1460 | goto err; | |
1461 | } | |
1462 | ||
2c2709dc | 1463 | opp_table->regulator = reg; |
9f8ea969 | 1464 | |
2c2709dc | 1465 | mutex_unlock(&opp_table_lock); |
9f8ea969 VK |
1466 | return 0; |
1467 | ||
1468 | err: | |
2c2709dc | 1469 | _remove_opp_table(opp_table); |
9f8ea969 | 1470 | unlock: |
2c2709dc | 1471 | mutex_unlock(&opp_table_lock); |
9f8ea969 VK |
1472 | |
1473 | return ret; | |
1474 | } | |
1475 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulator); | |
1476 | ||
1477 | /** | |
1478 | * dev_pm_opp_put_regulator() - Releases resources blocked for regulator | |
1479 | * @dev: Device for which regulator was set. | |
1480 | * | |
2c2709dc | 1481 | * Locking: The internal opp_table and opp structures are RCU protected. |
9f8ea969 VK |
1482 | * Hence this function internally uses RCU updater strategy with mutex locks |
1483 | * to keep the integrity of the internal data structures. Callers should ensure | |
1484 | * that this function is *NOT* called under RCU protection or in contexts where | |
1485 | * mutex cannot be locked. | |
1486 | */ | |
1487 | void dev_pm_opp_put_regulator(struct device *dev) | |
1488 | { | |
2c2709dc | 1489 | struct opp_table *opp_table; |
9f8ea969 | 1490 | |
2c2709dc | 1491 | mutex_lock(&opp_table_lock); |
9f8ea969 | 1492 | |
2c2709dc VK |
1493 | /* Check for existing table for 'dev' first */ |
1494 | opp_table = _find_opp_table(dev); | |
1495 | if (IS_ERR(opp_table)) { | |
1496 | dev_err(dev, "Failed to find opp_table: %ld\n", | |
1497 | PTR_ERR(opp_table)); | |
9f8ea969 VK |
1498 | goto unlock; |
1499 | } | |
1500 | ||
2c2709dc | 1501 | if (IS_ERR(opp_table->regulator)) { |
9f8ea969 VK |
1502 | dev_err(dev, "%s: Doesn't have regulator set\n", __func__); |
1503 | goto unlock; | |
1504 | } | |
1505 | ||
2c2709dc VK |
1506 | /* Make sure there are no concurrent readers while updating opp_table */ |
1507 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
9f8ea969 | 1508 | |
2c2709dc VK |
1509 | regulator_put(opp_table->regulator); |
1510 | opp_table->regulator = ERR_PTR(-ENXIO); | |
9f8ea969 | 1511 | |
2c2709dc VK |
1512 | /* Try freeing opp_table if this was the last blocking resource */ |
1513 | _remove_opp_table(opp_table); | |
9f8ea969 VK |
1514 | |
1515 | unlock: | |
2c2709dc | 1516 | mutex_unlock(&opp_table_lock); |
9f8ea969 VK |
1517 | } |
1518 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulator); | |
1519 | ||
2c2709dc | 1520 | static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, |
7de36b0a VK |
1521 | struct device_node *np) |
1522 | { | |
2c2709dc | 1523 | unsigned int count = opp_table->supported_hw_count; |
7de36b0a VK |
1524 | u32 version; |
1525 | int ret; | |
1526 | ||
2c2709dc | 1527 | if (!opp_table->supported_hw) |
7de36b0a VK |
1528 | return true; |
1529 | ||
1530 | while (count--) { | |
1531 | ret = of_property_read_u32_index(np, "opp-supported-hw", count, | |
1532 | &version); | |
1533 | if (ret) { | |
1534 | dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", | |
1535 | __func__, count, ret); | |
1536 | return false; | |
1537 | } | |
1538 | ||
1539 | /* Both of these are bitwise masks of the versions */ | |
2c2709dc | 1540 | if (!(version & opp_table->supported_hw[count])) |
7de36b0a VK |
1541 | return false; |
1542 | } | |
1543 | ||
1544 | return true; | |
1545 | } | |
1546 | ||
27465902 VK |
1547 | /** |
1548 | * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) | |
1549 | * @dev: device for which we do this operation | |
1550 | * @np: device node | |
1551 | * | |
2c2709dc | 1552 | * This function adds an opp definition to the opp table and returns status. The |
27465902 VK |
1553 | * opp can be controlled using dev_pm_opp_enable/disable functions and may be |
1554 | * removed by dev_pm_opp_remove. | |
1555 | * | |
2c2709dc | 1556 | * Locking: The internal opp_table and opp structures are RCU protected. |
27465902 VK |
1557 | * Hence this function internally uses RCU updater strategy with mutex locks |
1558 | * to keep the integrity of the internal data structures. Callers should ensure | |
1559 | * that this function is *NOT* called under RCU protection or in contexts where | |
1560 | * mutex cannot be locked. | |
1561 | * | |
1562 | * Return: | |
1563 | * 0 On success OR | |
1564 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1565 | * -EEXIST Freq are same and volt are different OR | |
1566 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1567 | * -ENOMEM Memory allocation failure | |
1568 | * -EINVAL Failed parsing the OPP node | |
1569 | */ | |
1570 | static int _opp_add_static_v2(struct device *dev, struct device_node *np) | |
1571 | { | |
2c2709dc | 1572 | struct opp_table *opp_table; |
27465902 VK |
1573 | struct dev_pm_opp *new_opp; |
1574 | u64 rate; | |
68fa9f0a | 1575 | u32 val; |
27465902 VK |
1576 | int ret; |
1577 | ||
2c2709dc VK |
1578 | /* Hold our table modification lock here */ |
1579 | mutex_lock(&opp_table_lock); | |
27465902 | 1580 | |
2c2709dc | 1581 | new_opp = _allocate_opp(dev, &opp_table); |
27465902 VK |
1582 | if (!new_opp) { |
1583 | ret = -ENOMEM; | |
1584 | goto unlock; | |
1585 | } | |
1586 | ||
1587 | ret = of_property_read_u64(np, "opp-hz", &rate); | |
1588 | if (ret < 0) { | |
1589 | dev_err(dev, "%s: opp-hz not found\n", __func__); | |
1590 | goto free_opp; | |
1591 | } | |
1592 | ||
7de36b0a | 1593 | /* Check if the OPP supports hardware's hierarchy of versions or not */ |
2c2709dc | 1594 | if (!_opp_is_supported(dev, opp_table, np)) { |
7de36b0a VK |
1595 | dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate); |
1596 | goto free_opp; | |
1597 | } | |
1598 | ||
27465902 VK |
1599 | /* |
1600 | * Rate is defined as an unsigned long in clk API, and so casting | |
1601 | * explicitly to its type. Must be fixed once rate is 64 bit | |
1602 | * guaranteed in clk API. | |
1603 | */ | |
1604 | new_opp->rate = (unsigned long)rate; | |
1605 | new_opp->turbo = of_property_read_bool(np, "turbo-mode"); | |
1606 | ||
1607 | new_opp->np = np; | |
1608 | new_opp->dynamic = false; | |
1609 | new_opp->available = true; | |
68fa9f0a VK |
1610 | |
1611 | if (!of_property_read_u32(np, "clock-latency-ns", &val)) | |
1612 | new_opp->clock_latency_ns = val; | |
27465902 | 1613 | |
2c2709dc | 1614 | ret = opp_parse_supplies(new_opp, dev, opp_table); |
27465902 VK |
1615 | if (ret) |
1616 | goto free_opp; | |
1617 | ||
2c2709dc | 1618 | ret = _opp_add(dev, new_opp, opp_table); |
27465902 VK |
1619 | if (ret) |
1620 | goto free_opp; | |
1621 | ||
ad656a6a VK |
1622 | /* OPP to select on device suspend */ |
1623 | if (of_property_read_bool(np, "opp-suspend")) { | |
2c2709dc | 1624 | if (opp_table->suspend_opp) { |
ad656a6a | 1625 | dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n", |
2c2709dc | 1626 | __func__, opp_table->suspend_opp->rate, |
ad656a6a | 1627 | new_opp->rate); |
deaa5146 VK |
1628 | } else { |
1629 | new_opp->suspend = true; | |
2c2709dc | 1630 | opp_table->suspend_opp = new_opp; |
deaa5146 | 1631 | } |
ad656a6a VK |
1632 | } |
1633 | ||
2c2709dc VK |
1634 | if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) |
1635 | opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; | |
3ca9bb33 | 1636 | |
2c2709dc | 1637 | mutex_unlock(&opp_table_lock); |
27465902 | 1638 | |
3ca9bb33 | 1639 | pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", |
27465902 | 1640 | __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt, |
3ca9bb33 VK |
1641 | new_opp->u_volt_min, new_opp->u_volt_max, |
1642 | new_opp->clock_latency_ns); | |
27465902 VK |
1643 | |
1644 | /* | |
1645 | * Notify the changes in the availability of the operable | |
1646 | * frequency/voltage list. | |
1647 | */ | |
2c2709dc | 1648 | srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp); |
27465902 VK |
1649 | return 0; |
1650 | ||
1651 | free_opp: | |
2c2709dc | 1652 | _opp_remove(opp_table, new_opp, false); |
27465902 | 1653 | unlock: |
2c2709dc | 1654 | mutex_unlock(&opp_table_lock); |
27465902 VK |
1655 | return ret; |
1656 | } | |
1657 | ||
38393409 VK |
1658 | /** |
1659 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
1660 | * @dev: device for which we do this operation | |
1661 | * @freq: Frequency in Hz for this OPP | |
1662 | * @u_volt: Voltage in uVolts for this OPP | |
1663 | * | |
2c2709dc | 1664 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
1665 | * The opp is made available by default and it can be controlled using |
1666 | * dev_pm_opp_enable/disable functions. | |
1667 | * | |
2c2709dc | 1668 | * Locking: The internal opp_table and opp structures are RCU protected. |
38393409 VK |
1669 | * Hence this function internally uses RCU updater strategy with mutex locks |
1670 | * to keep the integrity of the internal data structures. Callers should ensure | |
1671 | * that this function is *NOT* called under RCU protection or in contexts where | |
1672 | * mutex cannot be locked. | |
1673 | * | |
1674 | * Return: | |
984f16c8 | 1675 | * 0 On success OR |
38393409 | 1676 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 1677 | * -EEXIST Freq are same and volt are different OR |
38393409 | 1678 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 1679 | * -ENOMEM Memory allocation failure |
38393409 VK |
1680 | */ |
1681 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
1682 | { | |
b64b9c3f | 1683 | return _opp_add_v1(dev, freq, u_volt, true); |
38393409 | 1684 | } |
5d4879cd | 1685 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
1686 | |
1687 | /** | |
327854c8 | 1688 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
1689 | * @dev: device for which we do this operation |
1690 | * @freq: OPP frequency to modify availability | |
1691 | * @availability_req: availability status requested for this opp | |
1692 | * | |
1693 | * Set the availability of an OPP with an RCU operation, opp_{enable,disable} | |
1694 | * share a common logic which is isolated here. | |
1695 | * | |
984f16c8 | 1696 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1697 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 NM |
1698 | * successful. |
1699 | * | |
2c2709dc | 1700 | * Locking: The internal opp_table and opp structures are RCU protected. |
e1f60b29 NM |
1701 | * Hence this function internally uses RCU updater strategy with mutex locks to |
1702 | * keep the integrity of the internal data structures. Callers should ensure | |
1703 | * that this function is *NOT* called under RCU protection or in contexts where | |
1704 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
1705 | */ | |
327854c8 NM |
1706 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
1707 | bool availability_req) | |
e1f60b29 | 1708 | { |
2c2709dc | 1709 | struct opp_table *opp_table; |
47d43ba7 | 1710 | struct dev_pm_opp *new_opp, *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
1711 | int r = 0; |
1712 | ||
1713 | /* keep the node allocated */ | |
47d43ba7 | 1714 | new_opp = kmalloc(sizeof(*new_opp), GFP_KERNEL); |
59d84ca8 | 1715 | if (!new_opp) |
e1f60b29 | 1716 | return -ENOMEM; |
e1f60b29 | 1717 | |
2c2709dc | 1718 | mutex_lock(&opp_table_lock); |
e1f60b29 | 1719 | |
2c2709dc VK |
1720 | /* Find the opp_table */ |
1721 | opp_table = _find_opp_table(dev); | |
1722 | if (IS_ERR(opp_table)) { | |
1723 | r = PTR_ERR(opp_table); | |
e1f60b29 NM |
1724 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
1725 | goto unlock; | |
1726 | } | |
1727 | ||
1728 | /* Do we have the frequency? */ | |
2c2709dc | 1729 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
1730 | if (tmp_opp->rate == freq) { |
1731 | opp = tmp_opp; | |
1732 | break; | |
1733 | } | |
1734 | } | |
1735 | if (IS_ERR(opp)) { | |
1736 | r = PTR_ERR(opp); | |
1737 | goto unlock; | |
1738 | } | |
1739 | ||
1740 | /* Is update really needed? */ | |
1741 | if (opp->available == availability_req) | |
1742 | goto unlock; | |
1743 | /* copy the old data over */ | |
1744 | *new_opp = *opp; | |
1745 | ||
1746 | /* plug in new node */ | |
1747 | new_opp->available = availability_req; | |
1748 | ||
1749 | list_replace_rcu(&opp->node, &new_opp->node); | |
2c2709dc VK |
1750 | mutex_unlock(&opp_table_lock); |
1751 | call_srcu(&opp_table->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu); | |
e1f60b29 | 1752 | |
03ca370f MH |
1753 | /* Notify the change of the OPP availability */ |
1754 | if (availability_req) | |
2c2709dc VK |
1755 | srcu_notifier_call_chain(&opp_table->srcu_head, |
1756 | OPP_EVENT_ENABLE, new_opp); | |
03ca370f | 1757 | else |
2c2709dc VK |
1758 | srcu_notifier_call_chain(&opp_table->srcu_head, |
1759 | OPP_EVENT_DISABLE, new_opp); | |
03ca370f | 1760 | |
dde8437d | 1761 | return 0; |
e1f60b29 NM |
1762 | |
1763 | unlock: | |
2c2709dc | 1764 | mutex_unlock(&opp_table_lock); |
e1f60b29 NM |
1765 | kfree(new_opp); |
1766 | return r; | |
1767 | } | |
1768 | ||
1769 | /** | |
5d4879cd | 1770 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
1771 | * @dev: device for which we do this operation |
1772 | * @freq: OPP frequency to enable | |
1773 | * | |
1774 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
1775 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 1776 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 1777 | * |
2c2709dc | 1778 | * Locking: The internal opp_table and opp structures are RCU protected. |
e1f60b29 NM |
1779 | * Hence this function indirectly uses RCU and mutex locks to keep the |
1780 | * integrity of the internal data structures. Callers should ensure that | |
1781 | * this function is *NOT* called under RCU protection or in contexts where | |
1782 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
984f16c8 NM |
1783 | * |
1784 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
e1a2d49c | 1785 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1786 | * successful. |
e1f60b29 | 1787 | */ |
5d4879cd | 1788 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 1789 | { |
327854c8 | 1790 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 1791 | } |
5d4879cd | 1792 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
1793 | |
1794 | /** | |
5d4879cd | 1795 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
1796 | * @dev: device for which we do this operation |
1797 | * @freq: OPP frequency to disable | |
1798 | * | |
1799 | * Disables a provided opp. If the operation is valid, this returns | |
1800 | * 0, else the corresponding error value. It is meant to be a temporary | |
1801 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 1802 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 1803 | * |
2c2709dc | 1804 | * Locking: The internal opp_table and opp structures are RCU protected. |
e1f60b29 NM |
1805 | * Hence this function indirectly uses RCU and mutex locks to keep the |
1806 | * integrity of the internal data structures. Callers should ensure that | |
1807 | * this function is *NOT* called under RCU protection or in contexts where | |
1808 | * mutex locking or synchronize_rcu() blocking calls cannot be used. | |
984f16c8 NM |
1809 | * |
1810 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
e1a2d49c | 1811 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1812 | * successful. |
e1f60b29 | 1813 | */ |
5d4879cd | 1814 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 1815 | { |
327854c8 | 1816 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 1817 | } |
5d4879cd | 1818 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 1819 | |
03ca370f | 1820 | /** |
5d4879cd | 1821 | * dev_pm_opp_get_notifier() - find notifier_head of the device with opp |
2c2709dc | 1822 | * @dev: device pointer used to lookup OPP table. |
984f16c8 NM |
1823 | * |
1824 | * Return: pointer to notifier head if found, otherwise -ENODEV or | |
1825 | * -EINVAL based on type of error casted as pointer. value must be checked | |
1826 | * with IS_ERR to determine valid pointer or error result. | |
1827 | * | |
2c2709dc VK |
1828 | * Locking: This function must be called under rcu_read_lock(). opp_table is a |
1829 | * RCU protected pointer. The reason for the same is that the opp pointer which | |
1830 | * is returned will remain valid for use with opp_get_{voltage, freq} only while | |
984f16c8 NM |
1831 | * under the locked area. The pointer returned must be used prior to unlocking |
1832 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
03ca370f | 1833 | */ |
5d4879cd | 1834 | struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev) |
03ca370f | 1835 | { |
2c2709dc | 1836 | struct opp_table *opp_table = _find_opp_table(dev); |
03ca370f | 1837 | |
2c2709dc VK |
1838 | if (IS_ERR(opp_table)) |
1839 | return ERR_CAST(opp_table); /* matching type */ | |
03ca370f | 1840 | |
2c2709dc | 1841 | return &opp_table->srcu_head; |
03ca370f | 1842 | } |
4679ec37 | 1843 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier); |
b496dfbc SG |
1844 | |
1845 | #ifdef CONFIG_OF | |
1846 | /** | |
8f8d37b2 VK |
1847 | * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT |
1848 | * entries | |
2c2709dc | 1849 | * @dev: device pointer used to lookup OPP table. |
b496dfbc | 1850 | * |
737002b5 | 1851 | * Free OPPs created using static entries present in DT. |
984f16c8 | 1852 | * |
2c2709dc | 1853 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
1854 | * Hence this function indirectly uses RCU updater strategy with mutex locks |
1855 | * to keep the integrity of the internal data structures. Callers should ensure | |
1856 | * that this function is *NOT* called under RCU protection or in contexts where | |
1857 | * mutex cannot be locked. | |
b496dfbc | 1858 | */ |
8f8d37b2 | 1859 | void dev_pm_opp_of_remove_table(struct device *dev) |
737002b5 | 1860 | { |
2c2709dc | 1861 | struct opp_table *opp_table; |
737002b5 VK |
1862 | struct dev_pm_opp *opp, *tmp; |
1863 | ||
2c2709dc VK |
1864 | /* Hold our table modification lock here */ |
1865 | mutex_lock(&opp_table_lock); | |
06441658 | 1866 | |
2c2709dc VK |
1867 | /* Check for existing table for 'dev' */ |
1868 | opp_table = _find_opp_table(dev); | |
1869 | if (IS_ERR(opp_table)) { | |
1870 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
1871 | |
1872 | if (error != -ENODEV) | |
2c2709dc | 1873 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
1874 | IS_ERR_OR_NULL(dev) ? |
1875 | "Invalid device" : dev_name(dev), | |
1876 | error); | |
06441658 | 1877 | goto unlock; |
737002b5 VK |
1878 | } |
1879 | ||
2c2709dc VK |
1880 | /* Find if opp_table manages a single device */ |
1881 | if (list_is_singular(&opp_table->dev_list)) { | |
06441658 | 1882 | /* Free static OPPs */ |
2c2709dc | 1883 | list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { |
06441658 | 1884 | if (!opp->dynamic) |
2c2709dc | 1885 | _opp_remove(opp_table, opp, true); |
06441658 VK |
1886 | } |
1887 | } else { | |
2c2709dc | 1888 | _remove_opp_dev(_find_opp_dev(dev, opp_table), opp_table); |
737002b5 VK |
1889 | } |
1890 | ||
06441658 | 1891 | unlock: |
2c2709dc | 1892 | mutex_unlock(&opp_table_lock); |
737002b5 | 1893 | } |
8f8d37b2 | 1894 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); |
737002b5 | 1895 | |
1840995c | 1896 | /* Returns opp descriptor node for a device, caller must do of_node_put() */ |
f59d3ee8 | 1897 | struct device_node *_of_get_opp_desc_node(struct device *dev) |
8d4d4e98 | 1898 | { |
8d4d4e98 VK |
1899 | /* |
1900 | * TODO: Support for multiple OPP tables. | |
1901 | * | |
1902 | * There should be only ONE phandle present in "operating-points-v2" | |
1903 | * property. | |
1904 | */ | |
8d4d4e98 | 1905 | |
1840995c | 1906 | return of_parse_phandle(dev->of_node, "operating-points-v2", 0); |
8d4d4e98 VK |
1907 | } |
1908 | ||
27465902 | 1909 | /* Initializes OPP tables based on new bindings */ |
f0489a5e | 1910 | static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np) |
27465902 | 1911 | { |
1840995c | 1912 | struct device_node *np; |
2c2709dc | 1913 | struct opp_table *opp_table; |
27465902 VK |
1914 | int ret = 0, count = 0; |
1915 | ||
2c2709dc | 1916 | mutex_lock(&opp_table_lock); |
4a3a1353 | 1917 | |
2c2709dc VK |
1918 | opp_table = _managed_opp(opp_np); |
1919 | if (opp_table) { | |
06441658 | 1920 | /* OPPs are already managed */ |
2c2709dc | 1921 | if (!_add_opp_dev(dev, opp_table)) |
06441658 | 1922 | ret = -ENOMEM; |
2c2709dc | 1923 | mutex_unlock(&opp_table_lock); |
1840995c | 1924 | return ret; |
06441658 | 1925 | } |
2c2709dc | 1926 | mutex_unlock(&opp_table_lock); |
06441658 | 1927 | |
2c2709dc | 1928 | /* We have opp-table node now, iterate over it and add OPPs */ |
27465902 VK |
1929 | for_each_available_child_of_node(opp_np, np) { |
1930 | count++; | |
1931 | ||
1932 | ret = _opp_add_static_v2(dev, np); | |
1933 | if (ret) { | |
1934 | dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, | |
1935 | ret); | |
1f821ed7 | 1936 | goto free_table; |
27465902 VK |
1937 | } |
1938 | } | |
1939 | ||
1940 | /* There should be one of more OPP defined */ | |
1840995c VK |
1941 | if (WARN_ON(!count)) |
1942 | return -ENOENT; | |
27465902 | 1943 | |
2c2709dc | 1944 | mutex_lock(&opp_table_lock); |
4a3a1353 | 1945 | |
2c2709dc VK |
1946 | opp_table = _find_opp_table(dev); |
1947 | if (WARN_ON(IS_ERR(opp_table))) { | |
1948 | ret = PTR_ERR(opp_table); | |
1949 | mutex_unlock(&opp_table_lock); | |
1f821ed7 | 1950 | goto free_table; |
06441658 | 1951 | } |
27465902 | 1952 | |
2c2709dc VK |
1953 | opp_table->np = opp_np; |
1954 | opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared"); | |
1f821ed7 | 1955 | |
2c2709dc | 1956 | mutex_unlock(&opp_table_lock); |
4a3a1353 | 1957 | |
1f821ed7 VK |
1958 | return 0; |
1959 | ||
1960 | free_table: | |
8f8d37b2 | 1961 | dev_pm_opp_of_remove_table(dev); |
27465902 VK |
1962 | |
1963 | return ret; | |
1964 | } | |
1965 | ||
1966 | /* Initializes OPP tables based on old-deprecated bindings */ | |
f0489a5e | 1967 | static int _of_add_opp_table_v1(struct device *dev) |
b496dfbc SG |
1968 | { |
1969 | const struct property *prop; | |
1970 | const __be32 *val; | |
1971 | int nr; | |
1972 | ||
1973 | prop = of_find_property(dev->of_node, "operating-points", NULL); | |
1974 | if (!prop) | |
1975 | return -ENODEV; | |
1976 | if (!prop->value) | |
1977 | return -ENODATA; | |
1978 | ||
1979 | /* | |
1980 | * Each OPP is a set of tuples consisting of frequency and | |
1981 | * voltage like <freq-kHz vol-uV>. | |
1982 | */ | |
1983 | nr = prop->length / sizeof(u32); | |
1984 | if (nr % 2) { | |
2c2709dc | 1985 | dev_err(dev, "%s: Invalid OPP table\n", __func__); |
b496dfbc SG |
1986 | return -EINVAL; |
1987 | } | |
1988 | ||
1989 | val = prop->value; | |
1990 | while (nr) { | |
1991 | unsigned long freq = be32_to_cpup(val++) * 1000; | |
1992 | unsigned long volt = be32_to_cpup(val++); | |
1993 | ||
b64b9c3f | 1994 | if (_opp_add_v1(dev, freq, volt, false)) |
b496dfbc SG |
1995 | dev_warn(dev, "%s: Failed to add OPP %ld\n", |
1996 | __func__, freq); | |
b496dfbc SG |
1997 | nr -= 2; |
1998 | } | |
1999 | ||
2000 | return 0; | |
2001 | } | |
129eec55 VK |
2002 | |
2003 | /** | |
8f8d37b2 | 2004 | * dev_pm_opp_of_add_table() - Initialize opp table from device tree |
2c2709dc | 2005 | * @dev: device pointer used to lookup OPP table. |
129eec55 | 2006 | * |
27465902 | 2007 | * Register the initial OPP table with the OPP library for given device. |
984f16c8 | 2008 | * |
2c2709dc | 2009 | * Locking: The internal opp_table and opp structures are RCU protected. |
984f16c8 NM |
2010 | * Hence this function indirectly uses RCU updater strategy with mutex locks |
2011 | * to keep the integrity of the internal data structures. Callers should ensure | |
2012 | * that this function is *NOT* called under RCU protection or in contexts where | |
2013 | * mutex cannot be locked. | |
27465902 VK |
2014 | * |
2015 | * Return: | |
2016 | * 0 On success OR | |
2017 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
2018 | * -EEXIST Freq are same and volt are different OR | |
2019 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
2020 | * -ENOMEM Memory allocation failure | |
2021 | * -ENODEV when 'operating-points' property is not found or is invalid data | |
2022 | * in device node. | |
2023 | * -ENODATA when empty 'operating-points' property is found | |
2024 | * -EINVAL when invalid entries are found in opp-v2 table | |
129eec55 | 2025 | */ |
8f8d37b2 | 2026 | int dev_pm_opp_of_add_table(struct device *dev) |
129eec55 | 2027 | { |
1840995c VK |
2028 | struct device_node *opp_np; |
2029 | int ret; | |
27465902 VK |
2030 | |
2031 | /* | |
2032 | * OPPs have two version of bindings now. The older one is deprecated, | |
2033 | * try for the new binding first. | |
2034 | */ | |
1840995c VK |
2035 | opp_np = _of_get_opp_desc_node(dev); |
2036 | if (!opp_np) { | |
27465902 VK |
2037 | /* |
2038 | * Try old-deprecated bindings for backward compatibility with | |
2039 | * older dtbs. | |
2040 | */ | |
f0489a5e | 2041 | return _of_add_opp_table_v1(dev); |
8d4d4e98 VK |
2042 | } |
2043 | ||
f0489a5e | 2044 | ret = _of_add_opp_table_v2(dev, opp_np); |
1840995c | 2045 | of_node_put(opp_np); |
8d4d4e98 | 2046 | |
8d4d4e98 VK |
2047 | return ret; |
2048 | } | |
8f8d37b2 | 2049 | EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); |
b496dfbc | 2050 | #endif |