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