Commit | Line | Data |
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e1f60b29 NM |
1 | /* |
2 | * Generic OPP Interface | |
3 | * | |
4 | * Copyright (C) 2009-2010 Texas Instruments Incorporated. | |
5 | * Nishanth Menon | |
6 | * Romit Dasgupta | |
7 | * Kevin Hilman | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
d6d2a528 VK |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
d54974c2 | 16 | #include <linux/clk.h> |
e1f60b29 NM |
17 | #include <linux/errno.h> |
18 | #include <linux/err.h> | |
e1f60b29 | 19 | #include <linux/slab.h> |
51990e82 | 20 | #include <linux/device.h> |
80126ce7 | 21 | #include <linux/export.h> |
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 | |
8a31d9d9 VK |
35 | static void dev_pm_opp_get(struct dev_pm_opp *opp); |
36 | ||
2c2709dc VK |
37 | static struct opp_device *_find_opp_dev(const struct device *dev, |
38 | struct opp_table *opp_table) | |
06441658 | 39 | { |
2c2709dc | 40 | struct opp_device *opp_dev; |
06441658 | 41 | |
2c2709dc VK |
42 | list_for_each_entry(opp_dev, &opp_table->dev_list, node) |
43 | if (opp_dev->dev == dev) | |
44 | return opp_dev; | |
06441658 VK |
45 | |
46 | return NULL; | |
47 | } | |
48 | ||
6ac42397 | 49 | static struct opp_table *_find_opp_table_unlocked(struct device *dev) |
5b650b38 VK |
50 | { |
51 | struct opp_table *opp_table; | |
52 | ||
53 | list_for_each_entry(opp_table, &opp_tables, node) { | |
54 | if (_find_opp_dev(dev, opp_table)) { | |
55 | _get_opp_table_kref(opp_table); | |
56 | ||
57 | return opp_table; | |
58 | } | |
59 | } | |
60 | ||
61 | return ERR_PTR(-ENODEV); | |
62 | } | |
63 | ||
e1f60b29 | 64 | /** |
2c2709dc VK |
65 | * _find_opp_table() - find opp_table struct using device pointer |
66 | * @dev: device pointer used to lookup OPP table | |
e1f60b29 | 67 | * |
052c6f19 | 68 | * Search OPP table for one containing matching device. |
e1f60b29 | 69 | * |
2c2709dc | 70 | * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or |
e1f60b29 NM |
71 | * -EINVAL based on type of error. |
72 | * | |
5b650b38 | 73 | * The callers must call dev_pm_opp_put_opp_table() after the table is used. |
e1f60b29 | 74 | */ |
2c2709dc | 75 | struct opp_table *_find_opp_table(struct device *dev) |
e1f60b29 | 76 | { |
2c2709dc | 77 | struct opp_table *opp_table; |
e1f60b29 | 78 | |
50a3cb04 | 79 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
80 | pr_err("%s: Invalid parameters\n", __func__); |
81 | return ERR_PTR(-EINVAL); | |
82 | } | |
83 | ||
5b650b38 VK |
84 | mutex_lock(&opp_table_lock); |
85 | opp_table = _find_opp_table_unlocked(dev); | |
86 | mutex_unlock(&opp_table_lock); | |
e1f60b29 | 87 | |
5b650b38 | 88 | return opp_table; |
e1f60b29 NM |
89 | } |
90 | ||
91 | /** | |
d6d00742 | 92 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
93 | * @opp: opp for which voltage has to be returned for |
94 | * | |
984f16c8 | 95 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
96 | * return 0 |
97 | * | |
dfbe4678 | 98 | * This is useful only for devices with single power supply. |
e1f60b29 | 99 | */ |
47d43ba7 | 100 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 101 | { |
052c6f19 | 102 | if (IS_ERR_OR_NULL(opp)) { |
e1f60b29 | 103 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
104 | return 0; |
105 | } | |
e1f60b29 | 106 | |
052c6f19 | 107 | return opp->supplies[0].u_volt; |
e1f60b29 | 108 | } |
5d4879cd | 109 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
110 | |
111 | /** | |
5d4879cd | 112 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
113 | * @opp: opp for which frequency has to be returned for |
114 | * | |
984f16c8 | 115 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 | 116 | * return 0 |
e1f60b29 | 117 | */ |
47d43ba7 | 118 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 119 | { |
052c6f19 | 120 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
e1f60b29 | 121 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
122 | return 0; |
123 | } | |
e1f60b29 | 124 | |
052c6f19 | 125 | return opp->rate; |
e1f60b29 | 126 | } |
5d4879cd | 127 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 128 | |
19445b25 BZ |
129 | /** |
130 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
131 | * @opp: opp for which turbo mode is being verified | |
132 | * | |
133 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
134 | * conditions) for short duration of times to finish high throughput work | |
135 | * quickly. Running on them for longer times may overheat the chip. | |
136 | * | |
137 | * Return: true if opp is turbo opp, else false. | |
19445b25 BZ |
138 | */ |
139 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
140 | { | |
052c6f19 | 141 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
19445b25 BZ |
142 | pr_err("%s: Invalid parameters\n", __func__); |
143 | return false; | |
144 | } | |
145 | ||
052c6f19 | 146 | return opp->turbo; |
19445b25 BZ |
147 | } |
148 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
149 | ||
3ca9bb33 VK |
150 | /** |
151 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
152 | * @dev: device for which we do this operation | |
153 | * | |
154 | * Return: This function returns the max clock latency in nanoseconds. | |
3ca9bb33 VK |
155 | */ |
156 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
157 | { | |
2c2709dc | 158 | struct opp_table *opp_table; |
3ca9bb33 VK |
159 | unsigned long clock_latency_ns; |
160 | ||
2c2709dc VK |
161 | opp_table = _find_opp_table(dev); |
162 | if (IS_ERR(opp_table)) | |
5b650b38 VK |
163 | return 0; |
164 | ||
165 | clock_latency_ns = opp_table->clock_latency_ns_max; | |
166 | ||
167 | dev_pm_opp_put_opp_table(opp_table); | |
3ca9bb33 | 168 | |
3ca9bb33 VK |
169 | return clock_latency_ns; |
170 | } | |
171 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
172 | ||
655c9df9 VK |
173 | /** |
174 | * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds | |
175 | * @dev: device for which we do this operation | |
176 | * | |
177 | * Return: This function returns the max voltage latency in nanoseconds. | |
655c9df9 VK |
178 | */ |
179 | unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) | |
180 | { | |
2c2709dc | 181 | struct opp_table *opp_table; |
655c9df9 | 182 | struct dev_pm_opp *opp; |
478256bd | 183 | struct regulator *reg; |
655c9df9 | 184 | unsigned long latency_ns = 0; |
dfbe4678 VK |
185 | int ret, i, count; |
186 | struct { | |
187 | unsigned long min; | |
188 | unsigned long max; | |
189 | } *uV; | |
190 | ||
cdd3e614 VK |
191 | opp_table = _find_opp_table(dev); |
192 | if (IS_ERR(opp_table)) | |
193 | return 0; | |
194 | ||
195 | count = opp_table->regulator_count; | |
dfbe4678 VK |
196 | |
197 | /* Regulator may not be required for the device */ | |
198 | if (!count) | |
cdd3e614 | 199 | goto put_opp_table; |
dfbe4678 | 200 | |
dfbe4678 VK |
201 | uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); |
202 | if (!uV) | |
478256bd | 203 | goto put_opp_table; |
655c9df9 | 204 | |
052c6f19 VK |
205 | mutex_lock(&opp_table->lock); |
206 | ||
dfbe4678 VK |
207 | for (i = 0; i < count; i++) { |
208 | uV[i].min = ~0; | |
209 | uV[i].max = 0; | |
655c9df9 | 210 | |
052c6f19 | 211 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
dfbe4678 VK |
212 | if (!opp->available) |
213 | continue; | |
214 | ||
215 | if (opp->supplies[i].u_volt_min < uV[i].min) | |
216 | uV[i].min = opp->supplies[i].u_volt_min; | |
217 | if (opp->supplies[i].u_volt_max > uV[i].max) | |
218 | uV[i].max = opp->supplies[i].u_volt_max; | |
219 | } | |
655c9df9 VK |
220 | } |
221 | ||
052c6f19 | 222 | mutex_unlock(&opp_table->lock); |
655c9df9 VK |
223 | |
224 | /* | |
2c2709dc | 225 | * The caller needs to ensure that opp_table (and hence the regulator) |
655c9df9 VK |
226 | * isn't freed, while we are executing this routine. |
227 | */ | |
8cc31116 | 228 | for (i = 0; i < count; i++) { |
478256bd | 229 | reg = opp_table->regulators[i]; |
dfbe4678 VK |
230 | ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); |
231 | if (ret > 0) | |
232 | latency_ns += ret * 1000; | |
233 | } | |
234 | ||
dfbe4678 | 235 | kfree(uV); |
cdd3e614 VK |
236 | put_opp_table: |
237 | dev_pm_opp_put_opp_table(opp_table); | |
655c9df9 VK |
238 | |
239 | return latency_ns; | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); | |
242 | ||
21743447 VK |
243 | /** |
244 | * dev_pm_opp_get_max_transition_latency() - Get max transition latency in | |
245 | * nanoseconds | |
246 | * @dev: device for which we do this operation | |
247 | * | |
248 | * Return: This function returns the max transition latency, in nanoseconds, to | |
249 | * switch from one OPP to other. | |
21743447 VK |
250 | */ |
251 | unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) | |
252 | { | |
253 | return dev_pm_opp_get_max_volt_latency(dev) + | |
254 | dev_pm_opp_get_max_clock_latency(dev); | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); | |
257 | ||
4eafbd15 | 258 | /** |
3aa26a3b | 259 | * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz |
4eafbd15 BZ |
260 | * @dev: device for which we do this operation |
261 | * | |
3aa26a3b VK |
262 | * Return: This function returns the frequency of the OPP marked as suspend_opp |
263 | * if one is available, else returns 0; | |
4eafbd15 | 264 | */ |
3aa26a3b | 265 | unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev) |
4eafbd15 | 266 | { |
2c2709dc | 267 | struct opp_table *opp_table; |
3aa26a3b | 268 | unsigned long freq = 0; |
4eafbd15 | 269 | |
2c2709dc | 270 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
271 | if (IS_ERR(opp_table)) |
272 | return 0; | |
3aa26a3b | 273 | |
5b650b38 VK |
274 | if (opp_table->suspend_opp && opp_table->suspend_opp->available) |
275 | freq = dev_pm_opp_get_freq(opp_table->suspend_opp); | |
276 | ||
277 | dev_pm_opp_put_opp_table(opp_table); | |
4eafbd15 | 278 | |
3aa26a3b | 279 | return freq; |
4eafbd15 | 280 | } |
3aa26a3b | 281 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq); |
4eafbd15 | 282 | |
e1f60b29 | 283 | /** |
2c2709dc | 284 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table |
e1f60b29 NM |
285 | * @dev: device for which we do this operation |
286 | * | |
984f16c8 | 287 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 | 288 | * else returns 0 if none or the corresponding error value. |
e1f60b29 | 289 | */ |
5d4879cd | 290 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 | 291 | { |
2c2709dc | 292 | struct opp_table *opp_table; |
47d43ba7 | 293 | struct dev_pm_opp *temp_opp; |
e1f60b29 NM |
294 | int count = 0; |
295 | ||
2c2709dc VK |
296 | opp_table = _find_opp_table(dev); |
297 | if (IS_ERR(opp_table)) { | |
298 | count = PTR_ERR(opp_table); | |
299 | dev_err(dev, "%s: OPP table not found (%d)\n", | |
b4718c02 | 300 | __func__, count); |
5b650b38 | 301 | return count; |
e1f60b29 NM |
302 | } |
303 | ||
052c6f19 | 304 | mutex_lock(&opp_table->lock); |
5b650b38 | 305 | |
052c6f19 | 306 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
307 | if (temp_opp->available) |
308 | count++; | |
309 | } | |
310 | ||
052c6f19 | 311 | mutex_unlock(&opp_table->lock); |
5b650b38 VK |
312 | dev_pm_opp_put_opp_table(opp_table); |
313 | ||
e1f60b29 NM |
314 | return count; |
315 | } | |
5d4879cd | 316 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
317 | |
318 | /** | |
5d4879cd | 319 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
320 | * @dev: device for which we do this operation |
321 | * @freq: frequency to search for | |
7ae49618 | 322 | * @available: true/false - match for available opp |
e1f60b29 | 323 | * |
2c2709dc | 324 | * Return: Searches for exact match in the opp table and returns pointer to the |
984f16c8 NM |
325 | * matching opp if found, else returns ERR_PTR in case of error and should |
326 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
327 | * EINVAL: for bad pointer |
328 | * ERANGE: no match found for search | |
329 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
330 | * |
331 | * Note: available is a modifier for the search. if available=true, then the | |
332 | * match is for exact matching frequency and is available in the stored OPP | |
333 | * table. if false, the match is for exact frequency which is not available. | |
334 | * | |
335 | * This provides a mechanism to enable an opp which is not available currently | |
336 | * or the opposite as well. | |
337 | * | |
8a31d9d9 VK |
338 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
339 | * use. | |
e1f60b29 | 340 | */ |
47d43ba7 NM |
341 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
342 | unsigned long freq, | |
343 | bool available) | |
e1f60b29 | 344 | { |
2c2709dc | 345 | struct opp_table *opp_table; |
47d43ba7 | 346 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 347 | |
2c2709dc VK |
348 | opp_table = _find_opp_table(dev); |
349 | if (IS_ERR(opp_table)) { | |
350 | int r = PTR_ERR(opp_table); | |
351 | ||
352 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
e1f60b29 NM |
353 | return ERR_PTR(r); |
354 | } | |
355 | ||
052c6f19 | 356 | mutex_lock(&opp_table->lock); |
5b650b38 | 357 | |
052c6f19 | 358 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
359 | if (temp_opp->available == available && |
360 | temp_opp->rate == freq) { | |
361 | opp = temp_opp; | |
8a31d9d9 VK |
362 | |
363 | /* Increment the reference count of OPP */ | |
364 | dev_pm_opp_get(opp); | |
e1f60b29 NM |
365 | break; |
366 | } | |
367 | } | |
368 | ||
052c6f19 | 369 | mutex_unlock(&opp_table->lock); |
5b650b38 | 370 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 371 | |
e1f60b29 NM |
372 | return opp; |
373 | } | |
5d4879cd | 374 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 | 375 | |
067b7ce0 JZ |
376 | static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, |
377 | unsigned long *freq) | |
378 | { | |
379 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
380 | ||
052c6f19 VK |
381 | mutex_lock(&opp_table->lock); |
382 | ||
383 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
067b7ce0 JZ |
384 | if (temp_opp->available && temp_opp->rate >= *freq) { |
385 | opp = temp_opp; | |
386 | *freq = opp->rate; | |
8a31d9d9 VK |
387 | |
388 | /* Increment the reference count of OPP */ | |
389 | dev_pm_opp_get(opp); | |
067b7ce0 JZ |
390 | break; |
391 | } | |
392 | } | |
393 | ||
052c6f19 VK |
394 | mutex_unlock(&opp_table->lock); |
395 | ||
067b7ce0 JZ |
396 | return opp; |
397 | } | |
398 | ||
e1f60b29 | 399 | /** |
5d4879cd | 400 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
401 | * @dev: device for which we do this operation |
402 | * @freq: Start frequency | |
403 | * | |
404 | * Search for the matching ceil *available* OPP from a starting freq | |
405 | * for a device. | |
406 | * | |
984f16c8 | 407 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
408 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
409 | * values can be: | |
410 | * EINVAL: for bad pointer | |
411 | * ERANGE: no match found for search | |
412 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 413 | * |
8a31d9d9 VK |
414 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
415 | * use. | |
e1f60b29 | 416 | */ |
47d43ba7 NM |
417 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
418 | unsigned long *freq) | |
e1f60b29 | 419 | { |
2c2709dc | 420 | struct opp_table *opp_table; |
8a31d9d9 | 421 | struct dev_pm_opp *opp; |
b02ded24 | 422 | |
e1f60b29 NM |
423 | if (!dev || !freq) { |
424 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
425 | return ERR_PTR(-EINVAL); | |
426 | } | |
427 | ||
2c2709dc | 428 | opp_table = _find_opp_table(dev); |
5b650b38 | 429 | if (IS_ERR(opp_table)) |
2c2709dc | 430 | return ERR_CAST(opp_table); |
5b650b38 | 431 | |
8a31d9d9 | 432 | opp = _find_freq_ceil(opp_table, freq); |
e1f60b29 | 433 | |
5b650b38 | 434 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 VK |
435 | |
436 | return opp; | |
e1f60b29 | 437 | } |
5d4879cd | 438 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
439 | |
440 | /** | |
5d4879cd | 441 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
442 | * @dev: device for which we do this operation |
443 | * @freq: Start frequency | |
444 | * | |
445 | * Search for the matching floor *available* OPP from a starting freq | |
446 | * for a device. | |
447 | * | |
984f16c8 | 448 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
449 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
450 | * values can be: | |
451 | * EINVAL: for bad pointer | |
452 | * ERANGE: no match found for search | |
453 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 454 | * |
8a31d9d9 VK |
455 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
456 | * use. | |
e1f60b29 | 457 | */ |
47d43ba7 NM |
458 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
459 | unsigned long *freq) | |
e1f60b29 | 460 | { |
2c2709dc | 461 | struct opp_table *opp_table; |
47d43ba7 | 462 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 NM |
463 | |
464 | if (!dev || !freq) { | |
465 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
466 | return ERR_PTR(-EINVAL); | |
467 | } | |
468 | ||
2c2709dc | 469 | opp_table = _find_opp_table(dev); |
5b650b38 | 470 | if (IS_ERR(opp_table)) |
2c2709dc | 471 | return ERR_CAST(opp_table); |
5b650b38 | 472 | |
052c6f19 | 473 | mutex_lock(&opp_table->lock); |
e1f60b29 | 474 | |
052c6f19 | 475 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
476 | if (temp_opp->available) { |
477 | /* go to the next node, before choosing prev */ | |
478 | if (temp_opp->rate > *freq) | |
479 | break; | |
480 | else | |
481 | opp = temp_opp; | |
482 | } | |
483 | } | |
8a31d9d9 VK |
484 | |
485 | /* Increment the reference count of OPP */ | |
486 | if (!IS_ERR(opp)) | |
487 | dev_pm_opp_get(opp); | |
052c6f19 | 488 | mutex_unlock(&opp_table->lock); |
5b650b38 | 489 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 490 | |
e1f60b29 NM |
491 | if (!IS_ERR(opp)) |
492 | *freq = opp->rate; | |
493 | ||
494 | return opp; | |
495 | } | |
5d4879cd | 496 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 497 | |
6a0712f6 | 498 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, |
ce31781a | 499 | struct dev_pm_opp_supply *supply) |
6a0712f6 VK |
500 | { |
501 | int ret; | |
502 | ||
503 | /* Regulator not available for device */ | |
504 | if (IS_ERR(reg)) { | |
505 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
506 | PTR_ERR(reg)); | |
507 | return 0; | |
508 | } | |
509 | ||
ce31781a VK |
510 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, |
511 | supply->u_volt_min, supply->u_volt, supply->u_volt_max); | |
6a0712f6 | 512 | |
ce31781a VK |
513 | ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, |
514 | supply->u_volt, supply->u_volt_max); | |
6a0712f6 VK |
515 | if (ret) |
516 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
ce31781a VK |
517 | __func__, supply->u_volt_min, supply->u_volt, |
518 | supply->u_volt_max, ret); | |
6a0712f6 VK |
519 | |
520 | return ret; | |
521 | } | |
522 | ||
94735585 VK |
523 | static inline int |
524 | _generic_set_opp_clk_only(struct device *dev, struct clk *clk, | |
525 | unsigned long old_freq, unsigned long freq) | |
526 | { | |
527 | int ret; | |
528 | ||
529 | ret = clk_set_rate(clk, freq); | |
530 | if (ret) { | |
531 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
532 | ret); | |
533 | } | |
534 | ||
535 | return ret; | |
536 | } | |
537 | ||
c74b32fa VK |
538 | static int _generic_set_opp_regulator(const struct opp_table *opp_table, |
539 | struct device *dev, | |
540 | unsigned long old_freq, | |
541 | unsigned long freq, | |
542 | struct dev_pm_opp_supply *old_supply, | |
543 | struct dev_pm_opp_supply *new_supply) | |
94735585 | 544 | { |
c74b32fa | 545 | struct regulator *reg = opp_table->regulators[0]; |
94735585 VK |
546 | int ret; |
547 | ||
548 | /* This function only supports single regulator per device */ | |
c74b32fa | 549 | if (WARN_ON(opp_table->regulator_count > 1)) { |
94735585 VK |
550 | dev_err(dev, "multiple regulators are not supported\n"); |
551 | return -EINVAL; | |
552 | } | |
553 | ||
554 | /* Scaling up? Scale voltage before frequency */ | |
555 | if (freq > old_freq) { | |
556 | ret = _set_opp_voltage(dev, reg, new_supply); | |
557 | if (ret) | |
558 | goto restore_voltage; | |
559 | } | |
560 | ||
561 | /* Change frequency */ | |
c74b32fa | 562 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, old_freq, freq); |
94735585 VK |
563 | if (ret) |
564 | goto restore_voltage; | |
565 | ||
566 | /* Scaling down? Scale voltage after frequency */ | |
567 | if (freq < old_freq) { | |
568 | ret = _set_opp_voltage(dev, reg, new_supply); | |
569 | if (ret) | |
570 | goto restore_freq; | |
571 | } | |
572 | ||
573 | return 0; | |
574 | ||
575 | restore_freq: | |
c74b32fa | 576 | if (_generic_set_opp_clk_only(dev, opp_table->clk, freq, old_freq)) |
94735585 VK |
577 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
578 | __func__, old_freq); | |
579 | restore_voltage: | |
580 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
c74b32fa | 581 | if (old_supply) |
94735585 VK |
582 | _set_opp_voltage(dev, reg, old_supply); |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
6a0712f6 VK |
587 | /** |
588 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
589 | * @dev: device for which we do this operation | |
590 | * @target_freq: frequency to achieve | |
591 | * | |
592 | * This configures the power-supplies and clock source to the levels specified | |
593 | * by the OPP corresponding to the target_freq. | |
6a0712f6 VK |
594 | */ |
595 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
596 | { | |
2c2709dc | 597 | struct opp_table *opp_table; |
94735585 | 598 | unsigned long freq, old_freq; |
6a0712f6 | 599 | struct dev_pm_opp *old_opp, *opp; |
6a0712f6 | 600 | struct clk *clk; |
94735585 | 601 | int ret, size; |
6a0712f6 VK |
602 | |
603 | if (unlikely(!target_freq)) { | |
604 | dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, | |
605 | target_freq); | |
606 | return -EINVAL; | |
607 | } | |
608 | ||
052c6f19 VK |
609 | opp_table = _find_opp_table(dev); |
610 | if (IS_ERR(opp_table)) { | |
611 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); | |
612 | return PTR_ERR(opp_table); | |
613 | } | |
614 | ||
615 | clk = opp_table->clk; | |
616 | if (IS_ERR(clk)) { | |
617 | dev_err(dev, "%s: No clock available for the device\n", | |
618 | __func__); | |
619 | ret = PTR_ERR(clk); | |
620 | goto put_opp_table; | |
621 | } | |
6a0712f6 VK |
622 | |
623 | freq = clk_round_rate(clk, target_freq); | |
624 | if ((long)freq <= 0) | |
625 | freq = target_freq; | |
626 | ||
627 | old_freq = clk_get_rate(clk); | |
628 | ||
629 | /* Return early if nothing to do */ | |
630 | if (old_freq == freq) { | |
631 | dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", | |
632 | __func__, freq); | |
052c6f19 VK |
633 | ret = 0; |
634 | goto put_opp_table; | |
6a0712f6 VK |
635 | } |
636 | ||
067b7ce0 | 637 | old_opp = _find_freq_ceil(opp_table, &old_freq); |
4df27c91 | 638 | if (IS_ERR(old_opp)) { |
6a0712f6 VK |
639 | dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", |
640 | __func__, old_freq, PTR_ERR(old_opp)); | |
641 | } | |
642 | ||
067b7ce0 | 643 | opp = _find_freq_ceil(opp_table, &freq); |
6a0712f6 VK |
644 | if (IS_ERR(opp)) { |
645 | ret = PTR_ERR(opp); | |
646 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
647 | __func__, freq, ret); | |
052c6f19 | 648 | goto put_old_opp; |
6a0712f6 VK |
649 | } |
650 | ||
94735585 VK |
651 | dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, |
652 | old_freq, freq); | |
dfbe4678 | 653 | |
94735585 | 654 | /* Only frequency scaling */ |
c74b32fa | 655 | if (!opp_table->regulators) { |
052c6f19 | 656 | ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq); |
c74b32fa VK |
657 | } else if (!opp_table->set_opp) { |
658 | ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq, | |
659 | IS_ERR(old_opp) ? NULL : old_opp->supplies, | |
660 | opp->supplies); | |
661 | } else { | |
662 | struct dev_pm_set_opp_data *data; | |
663 | ||
664 | data = opp_table->set_opp_data; | |
665 | data->regulators = opp_table->regulators; | |
666 | data->regulator_count = opp_table->regulator_count; | |
667 | data->clk = clk; | |
668 | data->dev = dev; | |
669 | ||
670 | data->old_opp.rate = old_freq; | |
671 | size = sizeof(*opp->supplies) * opp_table->regulator_count; | |
672 | if (IS_ERR(old_opp)) | |
673 | memset(data->old_opp.supplies, 0, size); | |
674 | else | |
675 | memcpy(data->old_opp.supplies, old_opp->supplies, size); | |
676 | ||
677 | data->new_opp.rate = freq; | |
678 | memcpy(data->new_opp.supplies, opp->supplies, size); | |
679 | ||
680 | ret = opp_table->set_opp(data); | |
dfbe4678 VK |
681 | } |
682 | ||
8a31d9d9 | 683 | dev_pm_opp_put(opp); |
052c6f19 | 684 | put_old_opp: |
8a31d9d9 VK |
685 | if (!IS_ERR(old_opp)) |
686 | dev_pm_opp_put(old_opp); | |
052c6f19 | 687 | put_opp_table: |
5b650b38 | 688 | dev_pm_opp_put_opp_table(opp_table); |
052c6f19 | 689 | return ret; |
6a0712f6 VK |
690 | } |
691 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
692 | ||
2c2709dc | 693 | /* OPP-dev Helpers */ |
2c2709dc VK |
694 | static void _remove_opp_dev(struct opp_device *opp_dev, |
695 | struct opp_table *opp_table) | |
06441658 | 696 | { |
2c2709dc VK |
697 | opp_debug_unregister(opp_dev, opp_table); |
698 | list_del(&opp_dev->node); | |
052c6f19 | 699 | kfree(opp_dev); |
06441658 VK |
700 | } |
701 | ||
2c2709dc VK |
702 | struct opp_device *_add_opp_dev(const struct device *dev, |
703 | struct opp_table *opp_table) | |
06441658 | 704 | { |
2c2709dc | 705 | struct opp_device *opp_dev; |
deaa5146 | 706 | int ret; |
06441658 | 707 | |
2c2709dc VK |
708 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
709 | if (!opp_dev) | |
06441658 VK |
710 | return NULL; |
711 | ||
2c2709dc VK |
712 | /* Initialize opp-dev */ |
713 | opp_dev->dev = dev; | |
052c6f19 | 714 | list_add(&opp_dev->node, &opp_table->dev_list); |
06441658 | 715 | |
2c2709dc VK |
716 | /* Create debugfs entries for the opp_table */ |
717 | ret = opp_debug_register(opp_dev, opp_table); | |
deaa5146 VK |
718 | if (ret) |
719 | dev_err(dev, "%s: Failed to register opp debugfs (%d)\n", | |
720 | __func__, ret); | |
721 | ||
2c2709dc | 722 | return opp_dev; |
06441658 VK |
723 | } |
724 | ||
b6160e26 | 725 | static struct opp_table *_allocate_opp_table(struct device *dev) |
07cce74a | 726 | { |
2c2709dc VK |
727 | struct opp_table *opp_table; |
728 | struct opp_device *opp_dev; | |
d54974c2 | 729 | int ret; |
07cce74a VK |
730 | |
731 | /* | |
2c2709dc | 732 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
733 | * device is needed to be added, we pay this penalty. |
734 | */ | |
2c2709dc VK |
735 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
736 | if (!opp_table) | |
07cce74a VK |
737 | return NULL; |
738 | ||
2c2709dc | 739 | INIT_LIST_HEAD(&opp_table->dev_list); |
06441658 | 740 | |
2c2709dc VK |
741 | opp_dev = _add_opp_dev(dev, opp_table); |
742 | if (!opp_dev) { | |
743 | kfree(opp_table); | |
06441658 VK |
744 | return NULL; |
745 | } | |
746 | ||
f47b72a1 | 747 | _of_init_opp_table(opp_table, dev); |
50f8cfbd | 748 | |
d54974c2 | 749 | /* Find clk for the device */ |
2c2709dc VK |
750 | opp_table->clk = clk_get(dev, NULL); |
751 | if (IS_ERR(opp_table->clk)) { | |
752 | ret = PTR_ERR(opp_table->clk); | |
d54974c2 VK |
753 | if (ret != -EPROBE_DEFER) |
754 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, | |
755 | ret); | |
756 | } | |
757 | ||
052c6f19 | 758 | BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head); |
2c2709dc | 759 | INIT_LIST_HEAD(&opp_table->opp_list); |
37a73ec0 | 760 | mutex_init(&opp_table->lock); |
f067a982 | 761 | kref_init(&opp_table->kref); |
07cce74a | 762 | |
2c2709dc | 763 | /* Secure the device table modification */ |
052c6f19 | 764 | list_add(&opp_table->node, &opp_tables); |
2c2709dc | 765 | return opp_table; |
07cce74a VK |
766 | } |
767 | ||
f067a982 | 768 | void _get_opp_table_kref(struct opp_table *opp_table) |
b6160e26 | 769 | { |
f067a982 VK |
770 | kref_get(&opp_table->kref); |
771 | } | |
772 | ||
773 | struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) | |
774 | { | |
775 | struct opp_table *opp_table; | |
776 | ||
777 | /* Hold our table modification lock here */ | |
778 | mutex_lock(&opp_table_lock); | |
779 | ||
5b650b38 VK |
780 | opp_table = _find_opp_table_unlocked(dev); |
781 | if (!IS_ERR(opp_table)) | |
f067a982 | 782 | goto unlock; |
f067a982 VK |
783 | |
784 | opp_table = _allocate_opp_table(dev); | |
785 | ||
786 | unlock: | |
787 | mutex_unlock(&opp_table_lock); | |
788 | ||
789 | return opp_table; | |
790 | } | |
791 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); | |
792 | ||
b83c1899 | 793 | static void _opp_table_kref_release(struct kref *kref) |
f067a982 VK |
794 | { |
795 | struct opp_table *opp_table = container_of(kref, struct opp_table, kref); | |
b6160e26 VK |
796 | struct opp_device *opp_dev; |
797 | ||
798 | /* Release clk */ | |
799 | if (!IS_ERR(opp_table->clk)) | |
800 | clk_put(opp_table->clk); | |
801 | ||
802 | opp_dev = list_first_entry(&opp_table->dev_list, struct opp_device, | |
803 | node); | |
804 | ||
805 | _remove_opp_dev(opp_dev, opp_table); | |
806 | ||
807 | /* dev_list must be empty now */ | |
808 | WARN_ON(!list_empty(&opp_table->dev_list)); | |
809 | ||
37a73ec0 | 810 | mutex_destroy(&opp_table->lock); |
052c6f19 VK |
811 | list_del(&opp_table->node); |
812 | kfree(opp_table); | |
b6160e26 | 813 | |
f067a982 VK |
814 | mutex_unlock(&opp_table_lock); |
815 | } | |
816 | ||
817 | void dev_pm_opp_put_opp_table(struct opp_table *opp_table) | |
818 | { | |
819 | kref_put_mutex(&opp_table->kref, _opp_table_kref_release, | |
820 | &opp_table_lock); | |
821 | } | |
822 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table); | |
823 | ||
8cd2f6e8 | 824 | void _opp_free(struct dev_pm_opp *opp) |
969fceb3 VK |
825 | { |
826 | kfree(opp); | |
969fceb3 VK |
827 | } |
828 | ||
7034764a | 829 | static void _opp_kref_release(struct kref *kref) |
129eec55 | 830 | { |
7034764a VK |
831 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); |
832 | struct opp_table *opp_table = opp->opp_table; | |
37a73ec0 | 833 | |
129eec55 VK |
834 | /* |
835 | * Notify the changes in the availability of the operable | |
836 | * frequency/voltage list. | |
837 | */ | |
052c6f19 | 838 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); |
deaa5146 | 839 | opp_debug_remove_one(opp); |
052c6f19 VK |
840 | list_del(&opp->node); |
841 | kfree(opp); | |
129eec55 | 842 | |
37a73ec0 | 843 | mutex_unlock(&opp_table->lock); |
31641cda | 844 | dev_pm_opp_put_opp_table(opp_table); |
129eec55 VK |
845 | } |
846 | ||
8a31d9d9 VK |
847 | static void dev_pm_opp_get(struct dev_pm_opp *opp) |
848 | { | |
849 | kref_get(&opp->kref); | |
850 | } | |
851 | ||
7034764a VK |
852 | void dev_pm_opp_put(struct dev_pm_opp *opp) |
853 | { | |
854 | kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock); | |
855 | } | |
856 | EXPORT_SYMBOL_GPL(dev_pm_opp_put); | |
857 | ||
129eec55 | 858 | /** |
2c2709dc | 859 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
860 | * @dev: device for which we do this operation |
861 | * @freq: OPP to remove with matching 'freq' | |
862 | * | |
2c2709dc | 863 | * This function removes an opp from the opp table. |
129eec55 VK |
864 | */ |
865 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
866 | { | |
867 | struct dev_pm_opp *opp; | |
2c2709dc | 868 | struct opp_table *opp_table; |
129eec55 VK |
869 | bool found = false; |
870 | ||
2c2709dc VK |
871 | opp_table = _find_opp_table(dev); |
872 | if (IS_ERR(opp_table)) | |
5b650b38 | 873 | return; |
129eec55 | 874 | |
37a73ec0 VK |
875 | mutex_lock(&opp_table->lock); |
876 | ||
2c2709dc | 877 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
878 | if (opp->rate == freq) { |
879 | found = true; | |
880 | break; | |
881 | } | |
882 | } | |
883 | ||
37a73ec0 VK |
884 | mutex_unlock(&opp_table->lock); |
885 | ||
5b650b38 VK |
886 | if (found) { |
887 | dev_pm_opp_put(opp); | |
888 | } else { | |
129eec55 VK |
889 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", |
890 | __func__, freq); | |
129eec55 VK |
891 | } |
892 | ||
5b650b38 | 893 | dev_pm_opp_put_opp_table(opp_table); |
129eec55 VK |
894 | } |
895 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
896 | ||
8cd2f6e8 | 897 | struct dev_pm_opp *_opp_allocate(struct opp_table *table) |
e1f60b29 | 898 | { |
23dacf6d | 899 | struct dev_pm_opp *opp; |
dfbe4678 | 900 | int count, supply_size; |
e1f60b29 | 901 | |
dfbe4678 VK |
902 | /* Allocate space for at least one supply */ |
903 | count = table->regulator_count ? table->regulator_count : 1; | |
904 | supply_size = sizeof(*opp->supplies) * count; | |
e1f60b29 | 905 | |
dfbe4678 VK |
906 | /* allocate new OPP node and supplies structures */ |
907 | opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL); | |
8cd2f6e8 | 908 | if (!opp) |
23dacf6d | 909 | return NULL; |
23dacf6d | 910 | |
dfbe4678 VK |
911 | /* Put the supplies at the end of the OPP structure as an empty array */ |
912 | opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); | |
913 | INIT_LIST_HEAD(&opp->node); | |
914 | ||
23dacf6d VK |
915 | return opp; |
916 | } | |
917 | ||
7d34d56e | 918 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 919 | struct opp_table *opp_table) |
7d34d56e | 920 | { |
dfbe4678 VK |
921 | struct regulator *reg; |
922 | int i; | |
923 | ||
924 | for (i = 0; i < opp_table->regulator_count; i++) { | |
925 | reg = opp_table->regulators[i]; | |
926 | ||
927 | if (!regulator_is_supported_voltage(reg, | |
928 | opp->supplies[i].u_volt_min, | |
929 | opp->supplies[i].u_volt_max)) { | |
930 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
931 | __func__, opp->supplies[i].u_volt_min, | |
932 | opp->supplies[i].u_volt_max); | |
933 | return false; | |
934 | } | |
7d34d56e VK |
935 | } |
936 | ||
937 | return true; | |
938 | } | |
939 | ||
7f8538eb VK |
940 | /* |
941 | * Returns: | |
942 | * 0: On success. And appropriate error message for duplicate OPPs. | |
943 | * -EBUSY: For OPP with same freq/volt and is available. The callers of | |
944 | * _opp_add() must return 0 if they receive -EBUSY from it. This is to make | |
945 | * sure we don't print error messages unnecessarily if different parts of | |
946 | * kernel try to initialize the OPP table. | |
947 | * -EEXIST: For OPP with same freq but different volt or is unavailable. This | |
948 | * should be considered an error by the callers of _opp_add(). | |
949 | */ | |
f47b72a1 VK |
950 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, |
951 | struct opp_table *opp_table) | |
23dacf6d VK |
952 | { |
953 | struct dev_pm_opp *opp; | |
37a73ec0 | 954 | struct list_head *head; |
deaa5146 | 955 | int ret; |
23dacf6d VK |
956 | |
957 | /* | |
958 | * Insert new OPP in order of increasing frequency and discard if | |
959 | * already present. | |
960 | * | |
2c2709dc | 961 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
962 | * loop, don't replace it with head otherwise it will become an infinite |
963 | * loop. | |
964 | */ | |
37a73ec0 VK |
965 | mutex_lock(&opp_table->lock); |
966 | head = &opp_table->opp_list; | |
967 | ||
052c6f19 | 968 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
23dacf6d VK |
969 | if (new_opp->rate > opp->rate) { |
970 | head = &opp->node; | |
971 | continue; | |
972 | } | |
973 | ||
974 | if (new_opp->rate < opp->rate) | |
975 | break; | |
976 | ||
977 | /* Duplicate OPPs */ | |
06441658 | 978 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
dfbe4678 VK |
979 | __func__, opp->rate, opp->supplies[0].u_volt, |
980 | opp->available, new_opp->rate, | |
981 | new_opp->supplies[0].u_volt, new_opp->available); | |
23dacf6d | 982 | |
dfbe4678 | 983 | /* Should we compare voltages for all regulators here ? */ |
37a73ec0 VK |
984 | ret = opp->available && |
985 | new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST; | |
986 | ||
987 | mutex_unlock(&opp_table->lock); | |
988 | return ret; | |
23dacf6d VK |
989 | } |
990 | ||
052c6f19 | 991 | list_add(&new_opp->node, head); |
37a73ec0 VK |
992 | mutex_unlock(&opp_table->lock); |
993 | ||
994 | new_opp->opp_table = opp_table; | |
7034764a | 995 | kref_init(&new_opp->kref); |
23dacf6d | 996 | |
31641cda VK |
997 | /* Get a reference to the OPP table */ |
998 | _get_opp_table_kref(opp_table); | |
999 | ||
2c2709dc | 1000 | ret = opp_debug_create_one(new_opp, opp_table); |
deaa5146 VK |
1001 | if (ret) |
1002 | dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n", | |
1003 | __func__, ret); | |
1004 | ||
2c2709dc | 1005 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1006 | new_opp->available = false; |
1007 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1008 | __func__, new_opp->rate); | |
1009 | } | |
1010 | ||
23dacf6d VK |
1011 | return 0; |
1012 | } | |
1013 | ||
984f16c8 | 1014 | /** |
b64b9c3f | 1015 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
8cd2f6e8 | 1016 | * @opp_table: OPP table |
984f16c8 NM |
1017 | * @dev: device for which we do this operation |
1018 | * @freq: Frequency in Hz for this OPP | |
1019 | * @u_volt: Voltage in uVolts for this OPP | |
1020 | * @dynamic: Dynamically added OPPs. | |
1021 | * | |
2c2709dc | 1022 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1023 | * The opp is made available by default and it can be controlled using |
1024 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1025 | * | |
8f8d37b2 VK |
1026 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1027 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1028 | * |
984f16c8 NM |
1029 | * Return: |
1030 | * 0 On success OR | |
1031 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1032 | * -EEXIST Freq are same and volt are different OR | |
1033 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1034 | * -ENOMEM Memory allocation failure | |
1035 | */ | |
8cd2f6e8 VK |
1036 | int _opp_add_v1(struct opp_table *opp_table, struct device *dev, |
1037 | unsigned long freq, long u_volt, bool dynamic) | |
e1f60b29 | 1038 | { |
23dacf6d | 1039 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1040 | unsigned long tol; |
6ce4184d | 1041 | int ret; |
e1f60b29 | 1042 | |
8cd2f6e8 VK |
1043 | new_opp = _opp_allocate(opp_table); |
1044 | if (!new_opp) | |
1045 | return -ENOMEM; | |
23dacf6d | 1046 | |
a7470db6 | 1047 | /* populate the opp table */ |
a7470db6 | 1048 | new_opp->rate = freq; |
2c2709dc | 1049 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
dfbe4678 VK |
1050 | new_opp->supplies[0].u_volt = u_volt; |
1051 | new_opp->supplies[0].u_volt_min = u_volt - tol; | |
1052 | new_opp->supplies[0].u_volt_max = u_volt + tol; | |
a7470db6 | 1053 | new_opp->available = true; |
23dacf6d | 1054 | new_opp->dynamic = dynamic; |
a7470db6 | 1055 | |
2c2709dc | 1056 | ret = _opp_add(dev, new_opp, opp_table); |
7f8538eb VK |
1057 | if (ret) { |
1058 | /* Don't return error for duplicate OPPs */ | |
1059 | if (ret == -EBUSY) | |
1060 | ret = 0; | |
6ce4184d | 1061 | goto free_opp; |
7f8538eb | 1062 | } |
64ce8545 | 1063 | |
03ca370f MH |
1064 | /* |
1065 | * Notify the changes in the availability of the operable | |
1066 | * frequency/voltage list. | |
1067 | */ | |
052c6f19 | 1068 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1069 | return 0; |
6ce4184d VK |
1070 | |
1071 | free_opp: | |
8cd2f6e8 VK |
1072 | _opp_free(new_opp); |
1073 | ||
6ce4184d | 1074 | return ret; |
e1f60b29 | 1075 | } |
38393409 | 1076 | |
7de36b0a VK |
1077 | /** |
1078 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1079 | * @dev: Device for which supported-hw has to be set. | |
1080 | * @versions: Array of hierarchy of versions to match. | |
1081 | * @count: Number of elements in the array. | |
1082 | * | |
1083 | * This is required only for the V2 bindings, and it enables a platform to | |
1084 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1085 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1086 | * property. | |
7de36b0a | 1087 | */ |
fa30184d VK |
1088 | struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, |
1089 | const u32 *versions, unsigned int count) | |
7de36b0a | 1090 | { |
2c2709dc | 1091 | struct opp_table *opp_table; |
fa30184d | 1092 | int ret; |
7de36b0a | 1093 | |
fa30184d VK |
1094 | opp_table = dev_pm_opp_get_opp_table(dev); |
1095 | if (!opp_table) | |
1096 | return ERR_PTR(-ENOMEM); | |
7de36b0a | 1097 | |
2c2709dc VK |
1098 | /* Make sure there are no concurrent readers while updating opp_table */ |
1099 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1100 | |
2c2709dc VK |
1101 | /* Do we already have a version hierarchy associated with opp_table? */ |
1102 | if (opp_table->supported_hw) { | |
7de36b0a VK |
1103 | dev_err(dev, "%s: Already have supported hardware list\n", |
1104 | __func__); | |
1105 | ret = -EBUSY; | |
1106 | goto err; | |
1107 | } | |
1108 | ||
2c2709dc | 1109 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1110 | GFP_KERNEL); |
2c2709dc | 1111 | if (!opp_table->supported_hw) { |
7de36b0a VK |
1112 | ret = -ENOMEM; |
1113 | goto err; | |
1114 | } | |
1115 | ||
2c2709dc | 1116 | opp_table->supported_hw_count = count; |
fa30184d VK |
1117 | |
1118 | return opp_table; | |
7de36b0a VK |
1119 | |
1120 | err: | |
fa30184d | 1121 | dev_pm_opp_put_opp_table(opp_table); |
7de36b0a | 1122 | |
fa30184d | 1123 | return ERR_PTR(ret); |
7de36b0a VK |
1124 | } |
1125 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1126 | ||
1127 | /** | |
1128 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
fa30184d | 1129 | * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw(). |
7de36b0a VK |
1130 | * |
1131 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1132 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a | 1133 | * will not be freed. |
7de36b0a | 1134 | */ |
fa30184d | 1135 | void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) |
7de36b0a | 1136 | { |
2c2709dc VK |
1137 | /* Make sure there are no concurrent readers while updating opp_table */ |
1138 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1139 | |
2c2709dc | 1140 | if (!opp_table->supported_hw) { |
fa30184d VK |
1141 | pr_err("%s: Doesn't have supported hardware list\n", |
1142 | __func__); | |
1143 | return; | |
7de36b0a VK |
1144 | } |
1145 | ||
2c2709dc VK |
1146 | kfree(opp_table->supported_hw); |
1147 | opp_table->supported_hw = NULL; | |
1148 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1149 | |
fa30184d | 1150 | dev_pm_opp_put_opp_table(opp_table); |
7de36b0a VK |
1151 | } |
1152 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1153 | ||
01fb4d3c VK |
1154 | /** |
1155 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1156 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1157 | * @name: name to postfix to properties. |
1158 | * | |
1159 | * This is required only for the V2 bindings, and it enables a platform to | |
1160 | * specify the extn to be used for certain property names. The properties to | |
1161 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1162 | * should postfix the property name with -<name> while looking for them. | |
01fb4d3c | 1163 | */ |
fa30184d | 1164 | struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) |
01fb4d3c | 1165 | { |
2c2709dc | 1166 | struct opp_table *opp_table; |
fa30184d | 1167 | int ret; |
01fb4d3c | 1168 | |
fa30184d VK |
1169 | opp_table = dev_pm_opp_get_opp_table(dev); |
1170 | if (!opp_table) | |
1171 | return ERR_PTR(-ENOMEM); | |
01fb4d3c | 1172 | |
2c2709dc VK |
1173 | /* Make sure there are no concurrent readers while updating opp_table */ |
1174 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1175 | |
2c2709dc VK |
1176 | /* Do we already have a prop-name associated with opp_table? */ |
1177 | if (opp_table->prop_name) { | |
01fb4d3c | 1178 | dev_err(dev, "%s: Already have prop-name %s\n", __func__, |
2c2709dc | 1179 | opp_table->prop_name); |
01fb4d3c VK |
1180 | ret = -EBUSY; |
1181 | goto err; | |
1182 | } | |
1183 | ||
2c2709dc VK |
1184 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1185 | if (!opp_table->prop_name) { | |
01fb4d3c VK |
1186 | ret = -ENOMEM; |
1187 | goto err; | |
1188 | } | |
1189 | ||
fa30184d | 1190 | return opp_table; |
01fb4d3c VK |
1191 | |
1192 | err: | |
fa30184d | 1193 | dev_pm_opp_put_opp_table(opp_table); |
01fb4d3c | 1194 | |
fa30184d | 1195 | return ERR_PTR(ret); |
01fb4d3c VK |
1196 | } |
1197 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1198 | ||
1199 | /** | |
1200 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
fa30184d | 1201 | * @opp_table: OPP table returned by dev_pm_opp_set_prop_name(). |
01fb4d3c VK |
1202 | * |
1203 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1204 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c | 1205 | * will not be freed. |
01fb4d3c | 1206 | */ |
fa30184d | 1207 | void dev_pm_opp_put_prop_name(struct opp_table *opp_table) |
01fb4d3c | 1208 | { |
2c2709dc VK |
1209 | /* Make sure there are no concurrent readers while updating opp_table */ |
1210 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1211 | |
2c2709dc | 1212 | if (!opp_table->prop_name) { |
fa30184d VK |
1213 | pr_err("%s: Doesn't have a prop-name\n", __func__); |
1214 | return; | |
01fb4d3c VK |
1215 | } |
1216 | ||
2c2709dc VK |
1217 | kfree(opp_table->prop_name); |
1218 | opp_table->prop_name = NULL; | |
01fb4d3c | 1219 | |
fa30184d | 1220 | dev_pm_opp_put_opp_table(opp_table); |
01fb4d3c VK |
1221 | } |
1222 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1223 | ||
94735585 VK |
1224 | static int _allocate_set_opp_data(struct opp_table *opp_table) |
1225 | { | |
1226 | struct dev_pm_set_opp_data *data; | |
1227 | int len, count = opp_table->regulator_count; | |
1228 | ||
1229 | if (WARN_ON(!count)) | |
1230 | return -EINVAL; | |
1231 | ||
1232 | /* space for set_opp_data */ | |
1233 | len = sizeof(*data); | |
1234 | ||
1235 | /* space for old_opp.supplies and new_opp.supplies */ | |
1236 | len += 2 * sizeof(struct dev_pm_opp_supply) * count; | |
1237 | ||
1238 | data = kzalloc(len, GFP_KERNEL); | |
1239 | if (!data) | |
1240 | return -ENOMEM; | |
1241 | ||
1242 | data->old_opp.supplies = (void *)(data + 1); | |
1243 | data->new_opp.supplies = data->old_opp.supplies + count; | |
1244 | ||
1245 | opp_table->set_opp_data = data; | |
1246 | ||
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | static void _free_set_opp_data(struct opp_table *opp_table) | |
1251 | { | |
1252 | kfree(opp_table->set_opp_data); | |
1253 | opp_table->set_opp_data = NULL; | |
1254 | } | |
1255 | ||
9f8ea969 | 1256 | /** |
dfbe4678 | 1257 | * dev_pm_opp_set_regulators() - Set regulator names for the device |
9f8ea969 | 1258 | * @dev: Device for which regulator name is being set. |
dfbe4678 VK |
1259 | * @names: Array of pointers to the names of the regulator. |
1260 | * @count: Number of regulators. | |
9f8ea969 VK |
1261 | * |
1262 | * In order to support OPP switching, OPP layer needs to know the name of the | |
dfbe4678 VK |
1263 | * device's regulators, as the core would be required to switch voltages as |
1264 | * well. | |
9f8ea969 VK |
1265 | * |
1266 | * This must be called before any OPPs are initialized for the device. | |
9f8ea969 | 1267 | */ |
dfbe4678 VK |
1268 | struct opp_table *dev_pm_opp_set_regulators(struct device *dev, |
1269 | const char * const names[], | |
1270 | unsigned int count) | |
9f8ea969 | 1271 | { |
2c2709dc | 1272 | struct opp_table *opp_table; |
9f8ea969 | 1273 | struct regulator *reg; |
dfbe4678 | 1274 | int ret, i; |
9f8ea969 | 1275 | |
fa30184d VK |
1276 | opp_table = dev_pm_opp_get_opp_table(dev); |
1277 | if (!opp_table) | |
1278 | return ERR_PTR(-ENOMEM); | |
9f8ea969 VK |
1279 | |
1280 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1281 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1282 | ret = -EBUSY; |
1283 | goto err; | |
1284 | } | |
1285 | ||
dfbe4678 | 1286 | /* Already have regulators set */ |
e231f8d7 | 1287 | if (opp_table->regulators) { |
9f8ea969 VK |
1288 | ret = -EBUSY; |
1289 | goto err; | |
1290 | } | |
dfbe4678 VK |
1291 | |
1292 | opp_table->regulators = kmalloc_array(count, | |
1293 | sizeof(*opp_table->regulators), | |
1294 | GFP_KERNEL); | |
1295 | if (!opp_table->regulators) { | |
1296 | ret = -ENOMEM; | |
9f8ea969 VK |
1297 | goto err; |
1298 | } | |
1299 | ||
dfbe4678 VK |
1300 | for (i = 0; i < count; i++) { |
1301 | reg = regulator_get_optional(dev, names[i]); | |
1302 | if (IS_ERR(reg)) { | |
1303 | ret = PTR_ERR(reg); | |
1304 | if (ret != -EPROBE_DEFER) | |
1305 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
1306 | __func__, names[i], ret); | |
1307 | goto free_regulators; | |
1308 | } | |
1309 | ||
1310 | opp_table->regulators[i] = reg; | |
1311 | } | |
1312 | ||
1313 | opp_table->regulator_count = count; | |
9f8ea969 | 1314 | |
94735585 VK |
1315 | /* Allocate block only once to pass to set_opp() routines */ |
1316 | ret = _allocate_set_opp_data(opp_table); | |
1317 | if (ret) | |
1318 | goto free_regulators; | |
1319 | ||
91291d9a | 1320 | return opp_table; |
9f8ea969 | 1321 | |
dfbe4678 VK |
1322 | free_regulators: |
1323 | while (i != 0) | |
1324 | regulator_put(opp_table->regulators[--i]); | |
1325 | ||
1326 | kfree(opp_table->regulators); | |
1327 | opp_table->regulators = NULL; | |
94735585 | 1328 | opp_table->regulator_count = 0; |
9f8ea969 | 1329 | err: |
fa30184d | 1330 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1331 | |
91291d9a | 1332 | return ERR_PTR(ret); |
9f8ea969 | 1333 | } |
dfbe4678 | 1334 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); |
9f8ea969 VK |
1335 | |
1336 | /** | |
dfbe4678 VK |
1337 | * dev_pm_opp_put_regulators() - Releases resources blocked for regulator |
1338 | * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). | |
9f8ea969 | 1339 | */ |
dfbe4678 | 1340 | void dev_pm_opp_put_regulators(struct opp_table *opp_table) |
9f8ea969 | 1341 | { |
dfbe4678 VK |
1342 | int i; |
1343 | ||
dfbe4678 VK |
1344 | if (!opp_table->regulators) { |
1345 | pr_err("%s: Doesn't have regulators set\n", __func__); | |
fa30184d | 1346 | return; |
9f8ea969 VK |
1347 | } |
1348 | ||
2c2709dc VK |
1349 | /* Make sure there are no concurrent readers while updating opp_table */ |
1350 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
9f8ea969 | 1351 | |
dfbe4678 VK |
1352 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
1353 | regulator_put(opp_table->regulators[i]); | |
1354 | ||
94735585 VK |
1355 | _free_set_opp_data(opp_table); |
1356 | ||
dfbe4678 VK |
1357 | kfree(opp_table->regulators); |
1358 | opp_table->regulators = NULL; | |
1359 | opp_table->regulator_count = 0; | |
9f8ea969 | 1360 | |
fa30184d | 1361 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1362 | } |
dfbe4678 | 1363 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); |
9f8ea969 | 1364 | |
829a4e8c VK |
1365 | /** |
1366 | * dev_pm_opp_set_clkname() - Set clk name for the device | |
1367 | * @dev: Device for which clk name is being set. | |
1368 | * @name: Clk name. | |
1369 | * | |
1370 | * In order to support OPP switching, OPP layer needs to get pointer to the | |
1371 | * clock for the device. Simple cases work fine without using this routine (i.e. | |
1372 | * by passing connection-id as NULL), but for a device with multiple clocks | |
1373 | * available, the OPP core needs to know the exact name of the clk to use. | |
1374 | * | |
1375 | * This must be called before any OPPs are initialized for the device. | |
1376 | */ | |
1377 | struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name) | |
1378 | { | |
1379 | struct opp_table *opp_table; | |
1380 | int ret; | |
1381 | ||
1382 | opp_table = dev_pm_opp_get_opp_table(dev); | |
1383 | if (!opp_table) | |
1384 | return ERR_PTR(-ENOMEM); | |
1385 | ||
1386 | /* This should be called before OPPs are initialized */ | |
1387 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
1388 | ret = -EBUSY; | |
1389 | goto err; | |
1390 | } | |
1391 | ||
1392 | /* Already have default clk set, free it */ | |
1393 | if (!IS_ERR(opp_table->clk)) | |
1394 | clk_put(opp_table->clk); | |
1395 | ||
1396 | /* Find clk for the device */ | |
1397 | opp_table->clk = clk_get(dev, name); | |
1398 | if (IS_ERR(opp_table->clk)) { | |
1399 | ret = PTR_ERR(opp_table->clk); | |
1400 | if (ret != -EPROBE_DEFER) { | |
1401 | dev_err(dev, "%s: Couldn't find clock: %d\n", __func__, | |
1402 | ret); | |
1403 | } | |
1404 | goto err; | |
1405 | } | |
1406 | ||
1407 | return opp_table; | |
1408 | ||
1409 | err: | |
1410 | dev_pm_opp_put_opp_table(opp_table); | |
1411 | ||
1412 | return ERR_PTR(ret); | |
1413 | } | |
1414 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname); | |
1415 | ||
1416 | /** | |
1417 | * dev_pm_opp_put_clkname() - Releases resources blocked for clk. | |
1418 | * @opp_table: OPP table returned from dev_pm_opp_set_clkname(). | |
1419 | */ | |
1420 | void dev_pm_opp_put_clkname(struct opp_table *opp_table) | |
1421 | { | |
1422 | /* Make sure there are no concurrent readers while updating opp_table */ | |
1423 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1424 | ||
1425 | clk_put(opp_table->clk); | |
1426 | opp_table->clk = ERR_PTR(-EINVAL); | |
1427 | ||
1428 | dev_pm_opp_put_opp_table(opp_table); | |
1429 | } | |
1430 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname); | |
1431 | ||
4dab160e VK |
1432 | /** |
1433 | * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
1434 | * @dev: Device for which the helper is getting registered. | |
1435 | * @set_opp: Custom set OPP helper. | |
1436 | * | |
1437 | * This is useful to support complex platforms (like platforms with multiple | |
1438 | * regulators per device), instead of the generic OPP set rate helper. | |
1439 | * | |
1440 | * This must be called before any OPPs are initialized for the device. | |
4dab160e | 1441 | */ |
fa30184d | 1442 | struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, |
4dab160e VK |
1443 | int (*set_opp)(struct dev_pm_set_opp_data *data)) |
1444 | { | |
1445 | struct opp_table *opp_table; | |
1446 | int ret; | |
1447 | ||
1448 | if (!set_opp) | |
fa30184d | 1449 | return ERR_PTR(-EINVAL); |
4dab160e | 1450 | |
fa30184d VK |
1451 | opp_table = dev_pm_opp_get_opp_table(dev); |
1452 | if (!opp_table) | |
1453 | return ERR_PTR(-ENOMEM); | |
4dab160e VK |
1454 | |
1455 | /* This should be called before OPPs are initialized */ | |
1456 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
1457 | ret = -EBUSY; | |
1458 | goto err; | |
1459 | } | |
1460 | ||
1461 | /* Already have custom set_opp helper */ | |
1462 | if (WARN_ON(opp_table->set_opp)) { | |
1463 | ret = -EBUSY; | |
1464 | goto err; | |
1465 | } | |
1466 | ||
1467 | opp_table->set_opp = set_opp; | |
1468 | ||
fa30184d | 1469 | return opp_table; |
4dab160e VK |
1470 | |
1471 | err: | |
fa30184d | 1472 | dev_pm_opp_put_opp_table(opp_table); |
4dab160e | 1473 | |
fa30184d | 1474 | return ERR_PTR(ret); |
4dab160e VK |
1475 | } |
1476 | EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); | |
1477 | ||
1478 | /** | |
1479 | * dev_pm_opp_register_put_opp_helper() - Releases resources blocked for | |
1480 | * set_opp helper | |
fa30184d | 1481 | * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper(). |
4dab160e | 1482 | * |
fa30184d | 1483 | * Release resources blocked for platform specific set_opp helper. |
4dab160e | 1484 | */ |
fa30184d | 1485 | void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table) |
4dab160e | 1486 | { |
4dab160e | 1487 | if (!opp_table->set_opp) { |
fa30184d VK |
1488 | pr_err("%s: Doesn't have custom set_opp helper set\n", |
1489 | __func__); | |
1490 | return; | |
4dab160e VK |
1491 | } |
1492 | ||
1493 | /* Make sure there are no concurrent readers while updating opp_table */ | |
1494 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
1495 | ||
1496 | opp_table->set_opp = NULL; | |
1497 | ||
fa30184d | 1498 | dev_pm_opp_put_opp_table(opp_table); |
4dab160e VK |
1499 | } |
1500 | EXPORT_SYMBOL_GPL(dev_pm_opp_register_put_opp_helper); | |
1501 | ||
38393409 VK |
1502 | /** |
1503 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
1504 | * @dev: device for which we do this operation | |
1505 | * @freq: Frequency in Hz for this OPP | |
1506 | * @u_volt: Voltage in uVolts for this OPP | |
1507 | * | |
2c2709dc | 1508 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
1509 | * The opp is made available by default and it can be controlled using |
1510 | * dev_pm_opp_enable/disable functions. | |
1511 | * | |
38393409 | 1512 | * Return: |
984f16c8 | 1513 | * 0 On success OR |
38393409 | 1514 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 1515 | * -EEXIST Freq are same and volt are different OR |
38393409 | 1516 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 1517 | * -ENOMEM Memory allocation failure |
38393409 VK |
1518 | */ |
1519 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
1520 | { | |
8cd2f6e8 VK |
1521 | struct opp_table *opp_table; |
1522 | int ret; | |
1523 | ||
b83c1899 VK |
1524 | opp_table = dev_pm_opp_get_opp_table(dev); |
1525 | if (!opp_table) | |
1526 | return -ENOMEM; | |
8cd2f6e8 VK |
1527 | |
1528 | ret = _opp_add_v1(opp_table, dev, freq, u_volt, true); | |
8cd2f6e8 | 1529 | |
b83c1899 | 1530 | dev_pm_opp_put_opp_table(opp_table); |
8cd2f6e8 | 1531 | return ret; |
38393409 | 1532 | } |
5d4879cd | 1533 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
1534 | |
1535 | /** | |
327854c8 | 1536 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
1537 | * @dev: device for which we do this operation |
1538 | * @freq: OPP frequency to modify availability | |
1539 | * @availability_req: availability status requested for this opp | |
1540 | * | |
052c6f19 VK |
1541 | * Set the availability of an OPP, opp_{enable,disable} share a common logic |
1542 | * which is isolated here. | |
e1f60b29 | 1543 | * |
984f16c8 | 1544 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1545 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 | 1546 | * successful. |
e1f60b29 | 1547 | */ |
327854c8 NM |
1548 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
1549 | bool availability_req) | |
e1f60b29 | 1550 | { |
2c2709dc | 1551 | struct opp_table *opp_table; |
a7f3987e | 1552 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
1553 | int r = 0; |
1554 | ||
2c2709dc VK |
1555 | /* Find the opp_table */ |
1556 | opp_table = _find_opp_table(dev); | |
1557 | if (IS_ERR(opp_table)) { | |
1558 | r = PTR_ERR(opp_table); | |
e1f60b29 | 1559 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
a7f3987e | 1560 | return r; |
e1f60b29 NM |
1561 | } |
1562 | ||
37a73ec0 VK |
1563 | mutex_lock(&opp_table->lock); |
1564 | ||
e1f60b29 | 1565 | /* Do we have the frequency? */ |
2c2709dc | 1566 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
1567 | if (tmp_opp->rate == freq) { |
1568 | opp = tmp_opp; | |
1569 | break; | |
1570 | } | |
1571 | } | |
37a73ec0 | 1572 | |
e1f60b29 NM |
1573 | if (IS_ERR(opp)) { |
1574 | r = PTR_ERR(opp); | |
1575 | goto unlock; | |
1576 | } | |
1577 | ||
1578 | /* Is update really needed? */ | |
1579 | if (opp->available == availability_req) | |
1580 | goto unlock; | |
e1f60b29 | 1581 | |
a7f3987e | 1582 | opp->available = availability_req; |
e1f60b29 | 1583 | |
03ca370f MH |
1584 | /* Notify the change of the OPP availability */ |
1585 | if (availability_req) | |
052c6f19 | 1586 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE, |
a7f3987e | 1587 | opp); |
03ca370f | 1588 | else |
052c6f19 | 1589 | blocking_notifier_call_chain(&opp_table->head, |
a7f3987e | 1590 | OPP_EVENT_DISABLE, opp); |
e1f60b29 NM |
1591 | |
1592 | unlock: | |
5b650b38 VK |
1593 | mutex_unlock(&opp_table->lock); |
1594 | dev_pm_opp_put_opp_table(opp_table); | |
e1f60b29 NM |
1595 | return r; |
1596 | } | |
1597 | ||
1598 | /** | |
5d4879cd | 1599 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
1600 | * @dev: device for which we do this operation |
1601 | * @freq: OPP frequency to enable | |
1602 | * | |
1603 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
1604 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 1605 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 1606 | * |
984f16c8 | 1607 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1608 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1609 | * successful. |
e1f60b29 | 1610 | */ |
5d4879cd | 1611 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 1612 | { |
327854c8 | 1613 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 1614 | } |
5d4879cd | 1615 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
1616 | |
1617 | /** | |
5d4879cd | 1618 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
1619 | * @dev: device for which we do this operation |
1620 | * @freq: OPP frequency to disable | |
1621 | * | |
1622 | * Disables a provided opp. If the operation is valid, this returns | |
1623 | * 0, else the corresponding error value. It is meant to be a temporary | |
1624 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 1625 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 1626 | * |
984f16c8 | 1627 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 1628 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 1629 | * successful. |
e1f60b29 | 1630 | */ |
5d4879cd | 1631 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 1632 | { |
327854c8 | 1633 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 1634 | } |
5d4879cd | 1635 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 1636 | |
03ca370f | 1637 | /** |
dc2c9ad5 VK |
1638 | * dev_pm_opp_register_notifier() - Register OPP notifier for the device |
1639 | * @dev: Device for which notifier needs to be registered | |
1640 | * @nb: Notifier block to be registered | |
984f16c8 | 1641 | * |
dc2c9ad5 VK |
1642 | * Return: 0 on success or a negative error value. |
1643 | */ | |
1644 | int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) | |
1645 | { | |
1646 | struct opp_table *opp_table; | |
1647 | int ret; | |
1648 | ||
dc2c9ad5 | 1649 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
1650 | if (IS_ERR(opp_table)) |
1651 | return PTR_ERR(opp_table); | |
1652 | ||
052c6f19 | 1653 | ret = blocking_notifier_chain_register(&opp_table->head, nb); |
dc2c9ad5 | 1654 | |
5b650b38 | 1655 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
1656 | |
1657 | return ret; | |
1658 | } | |
1659 | EXPORT_SYMBOL(dev_pm_opp_register_notifier); | |
1660 | ||
1661 | /** | |
1662 | * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device | |
1663 | * @dev: Device for which notifier needs to be unregistered | |
1664 | * @nb: Notifier block to be unregistered | |
984f16c8 | 1665 | * |
dc2c9ad5 | 1666 | * Return: 0 on success or a negative error value. |
03ca370f | 1667 | */ |
dc2c9ad5 VK |
1668 | int dev_pm_opp_unregister_notifier(struct device *dev, |
1669 | struct notifier_block *nb) | |
03ca370f | 1670 | { |
dc2c9ad5 VK |
1671 | struct opp_table *opp_table; |
1672 | int ret; | |
03ca370f | 1673 | |
dc2c9ad5 | 1674 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
1675 | if (IS_ERR(opp_table)) |
1676 | return PTR_ERR(opp_table); | |
dc2c9ad5 | 1677 | |
052c6f19 | 1678 | ret = blocking_notifier_chain_unregister(&opp_table->head, nb); |
03ca370f | 1679 | |
5b650b38 | 1680 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
1681 | |
1682 | return ret; | |
03ca370f | 1683 | } |
dc2c9ad5 | 1684 | EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); |
b496dfbc | 1685 | |
411466c5 SH |
1686 | /* |
1687 | * Free OPPs either created using static entries present in DT or even the | |
1688 | * dynamically added entries based on remove_all param. | |
b496dfbc | 1689 | */ |
8cd2f6e8 VK |
1690 | void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev, |
1691 | bool remove_all) | |
737002b5 | 1692 | { |
737002b5 VK |
1693 | struct dev_pm_opp *opp, *tmp; |
1694 | ||
9274c892 VK |
1695 | /* Find if opp_table manages a single device */ |
1696 | if (list_is_singular(&opp_table->dev_list)) { | |
1697 | /* Free static OPPs */ | |
1698 | list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { | |
1699 | if (remove_all || !opp->dynamic) | |
7034764a | 1700 | dev_pm_opp_put(opp); |
9274c892 VK |
1701 | } |
1702 | } else { | |
1703 | _remove_opp_dev(_find_opp_dev(dev, opp_table), opp_table); | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all) | |
1708 | { | |
1709 | struct opp_table *opp_table; | |
1710 | ||
2c2709dc VK |
1711 | /* Check for existing table for 'dev' */ |
1712 | opp_table = _find_opp_table(dev); | |
1713 | if (IS_ERR(opp_table)) { | |
1714 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
1715 | |
1716 | if (error != -ENODEV) | |
2c2709dc | 1717 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
1718 | IS_ERR_OR_NULL(dev) ? |
1719 | "Invalid device" : dev_name(dev), | |
1720 | error); | |
5b650b38 | 1721 | return; |
737002b5 VK |
1722 | } |
1723 | ||
9274c892 | 1724 | _dev_pm_opp_remove_table(opp_table, dev, remove_all); |
737002b5 | 1725 | |
5b650b38 | 1726 | dev_pm_opp_put_opp_table(opp_table); |
737002b5 | 1727 | } |
129eec55 VK |
1728 | |
1729 | /** | |
411466c5 | 1730 | * dev_pm_opp_remove_table() - Free all OPPs associated with the device |
2c2709dc | 1731 | * @dev: device pointer used to lookup OPP table. |
129eec55 | 1732 | * |
411466c5 SH |
1733 | * Free both OPPs created using static entries present in DT and the |
1734 | * dynamically added entries. | |
129eec55 | 1735 | */ |
411466c5 | 1736 | void dev_pm_opp_remove_table(struct device *dev) |
129eec55 | 1737 | { |
9274c892 | 1738 | _dev_pm_opp_find_and_remove_table(dev, true); |
8d4d4e98 | 1739 | } |
411466c5 | 1740 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |