2 * Generic OPP Interface
4 * Copyright (C) 2009-2010 Texas Instruments Incorporated.
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.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/clk.h>
17 #include <linux/errno.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
20 #include <linux/device.h>
21 #include <linux/export.h>
22 #include <linux/regulator/consumer.h>
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
29 * various states of availability.
31 LIST_HEAD(opp_tables);
32 /* Lock to allow exclusive modification to the device and opp lists */
33 DEFINE_MUTEX(opp_table_lock);
35 static void dev_pm_opp_get(struct dev_pm_opp *opp);
37 static struct opp_device *_find_opp_dev(const struct device *dev,
38 struct opp_table *opp_table)
40 struct opp_device *opp_dev;
42 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
43 if (opp_dev->dev == dev)
49 static struct opp_table *_find_opp_table_unlocked(struct device *dev)
51 struct opp_table *opp_table;
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);
61 return ERR_PTR(-ENODEV);
65 * _find_opp_table() - find opp_table struct using device pointer
66 * @dev: device pointer used to lookup OPP table
68 * Search OPP table for one containing matching device.
70 * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
71 * -EINVAL based on type of error.
73 * The callers must call dev_pm_opp_put_opp_table() after the table is used.
75 struct opp_table *_find_opp_table(struct device *dev)
77 struct opp_table *opp_table;
79 if (IS_ERR_OR_NULL(dev)) {
80 pr_err("%s: Invalid parameters\n", __func__);
81 return ERR_PTR(-EINVAL);
84 mutex_lock(&opp_table_lock);
85 opp_table = _find_opp_table_unlocked(dev);
86 mutex_unlock(&opp_table_lock);
92 * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
93 * @opp: opp for which voltage has to be returned for
95 * Return: voltage in micro volt corresponding to the opp, else
98 * This is useful only for devices with single power supply.
100 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
102 if (IS_ERR_OR_NULL(opp)) {
103 pr_err("%s: Invalid parameters\n", __func__);
107 return opp->supplies[0].u_volt;
109 EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
112 * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
113 * @opp: opp for which frequency has to be returned for
115 * Return: frequency in hertz corresponding to the opp, else
118 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
120 if (IS_ERR_OR_NULL(opp) || !opp->available) {
121 pr_err("%s: Invalid parameters\n", __func__);
127 EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
130 * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
131 * @opp: opp for which turbo mode is being verified
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.
137 * Return: true if opp is turbo opp, else false.
139 bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
141 if (IS_ERR_OR_NULL(opp) || !opp->available) {
142 pr_err("%s: Invalid parameters\n", __func__);
148 EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
151 * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
152 * @dev: device for which we do this operation
154 * Return: This function returns the max clock latency in nanoseconds.
156 unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
158 struct opp_table *opp_table;
159 unsigned long clock_latency_ns;
161 opp_table = _find_opp_table(dev);
162 if (IS_ERR(opp_table))
165 clock_latency_ns = opp_table->clock_latency_ns_max;
167 dev_pm_opp_put_opp_table(opp_table);
169 return clock_latency_ns;
171 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
174 * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
175 * @dev: device for which we do this operation
177 * Return: This function returns the max voltage latency in nanoseconds.
179 unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
181 struct opp_table *opp_table;
182 struct dev_pm_opp *opp;
183 struct regulator *reg;
184 unsigned long latency_ns = 0;
191 opp_table = _find_opp_table(dev);
192 if (IS_ERR(opp_table))
195 count = opp_table->regulator_count;
197 /* Regulator may not be required for the device */
201 uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
205 mutex_lock(&opp_table->lock);
207 for (i = 0; i < count; i++) {
211 list_for_each_entry(opp, &opp_table->opp_list, node) {
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;
222 mutex_unlock(&opp_table->lock);
225 * The caller needs to ensure that opp_table (and hence the regulator)
226 * isn't freed, while we are executing this routine.
228 for (i = 0; i < count; i++) {
229 reg = opp_table->regulators[i];
230 ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
232 latency_ns += ret * 1000;
237 dev_pm_opp_put_opp_table(opp_table);
241 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
244 * dev_pm_opp_get_max_transition_latency() - Get max transition latency in
246 * @dev: device for which we do this operation
248 * Return: This function returns the max transition latency, in nanoseconds, to
249 * switch from one OPP to other.
251 unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
253 return dev_pm_opp_get_max_volt_latency(dev) +
254 dev_pm_opp_get_max_clock_latency(dev);
256 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
259 * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
260 * @dev: device for which we do this operation
262 * Return: This function returns the frequency of the OPP marked as suspend_opp
263 * if one is available, else returns 0;
265 unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
267 struct opp_table *opp_table;
268 unsigned long freq = 0;
270 opp_table = _find_opp_table(dev);
271 if (IS_ERR(opp_table))
274 if (opp_table->suspend_opp && opp_table->suspend_opp->available)
275 freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
277 dev_pm_opp_put_opp_table(opp_table);
281 EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
284 * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
285 * @dev: device for which we do this operation
287 * Return: This function returns the number of available opps if there are any,
288 * else returns 0 if none or the corresponding error value.
290 int dev_pm_opp_get_opp_count(struct device *dev)
292 struct opp_table *opp_table;
293 struct dev_pm_opp *temp_opp;
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",
304 mutex_lock(&opp_table->lock);
306 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
307 if (temp_opp->available)
311 mutex_unlock(&opp_table->lock);
312 dev_pm_opp_put_opp_table(opp_table);
316 EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
319 * dev_pm_opp_find_freq_exact() - search for an exact frequency
320 * @dev: device for which we do this operation
321 * @freq: frequency to search for
322 * @available: true/false - match for available opp
324 * Return: Searches for exact match in the opp table and returns pointer to the
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:
327 * EINVAL: for bad pointer
328 * ERANGE: no match found for search
329 * ENODEV: if device not found in list of registered devices
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.
335 * This provides a mechanism to enable an opp which is not available currently
336 * or the opposite as well.
338 * The callers are required to call dev_pm_opp_put() for the returned OPP after
341 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
345 struct opp_table *opp_table;
346 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
348 opp_table = _find_opp_table(dev);
349 if (IS_ERR(opp_table)) {
350 int r = PTR_ERR(opp_table);
352 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
356 mutex_lock(&opp_table->lock);
358 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
359 if (temp_opp->available == available &&
360 temp_opp->rate == freq) {
363 /* Increment the reference count of OPP */
369 mutex_unlock(&opp_table->lock);
370 dev_pm_opp_put_opp_table(opp_table);
374 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
376 static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
379 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
381 mutex_lock(&opp_table->lock);
383 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
384 if (temp_opp->available && temp_opp->rate >= *freq) {
388 /* Increment the reference count of OPP */
394 mutex_unlock(&opp_table->lock);
400 * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq
401 * @dev: device for which we do this operation
402 * @freq: Start frequency
404 * Search for the matching ceil *available* OPP from a starting freq
407 * Return: matching *opp and refreshes *freq accordingly, else returns
408 * ERR_PTR in case of error and should be handled using IS_ERR. Error return
410 * EINVAL: for bad pointer
411 * ERANGE: no match found for search
412 * ENODEV: if device not found in list of registered devices
414 * The callers are required to call dev_pm_opp_put() for the returned OPP after
417 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
420 struct opp_table *opp_table;
421 struct dev_pm_opp *opp;
424 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
425 return ERR_PTR(-EINVAL);
428 opp_table = _find_opp_table(dev);
429 if (IS_ERR(opp_table))
430 return ERR_CAST(opp_table);
432 opp = _find_freq_ceil(opp_table, freq);
434 dev_pm_opp_put_opp_table(opp_table);
438 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
441 * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq
442 * @dev: device for which we do this operation
443 * @freq: Start frequency
445 * Search for the matching floor *available* OPP from a starting freq
448 * Return: matching *opp and refreshes *freq accordingly, else returns
449 * ERR_PTR in case of error and should be handled using IS_ERR. Error return
451 * EINVAL: for bad pointer
452 * ERANGE: no match found for search
453 * ENODEV: if device not found in list of registered devices
455 * The callers are required to call dev_pm_opp_put() for the returned OPP after
458 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
461 struct opp_table *opp_table;
462 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
465 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
466 return ERR_PTR(-EINVAL);
469 opp_table = _find_opp_table(dev);
470 if (IS_ERR(opp_table))
471 return ERR_CAST(opp_table);
473 mutex_lock(&opp_table->lock);
475 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
476 if (temp_opp->available) {
477 /* go to the next node, before choosing prev */
478 if (temp_opp->rate > *freq)
485 /* Increment the reference count of OPP */
488 mutex_unlock(&opp_table->lock);
489 dev_pm_opp_put_opp_table(opp_table);
496 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
498 static int _set_opp_voltage(struct device *dev, struct regulator *reg,
499 struct dev_pm_opp_supply *supply)
503 /* Regulator not available for device */
505 dev_dbg(dev, "%s: regulator not available: %ld\n", __func__,
510 dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__,
511 supply->u_volt_min, supply->u_volt, supply->u_volt_max);
513 ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
514 supply->u_volt, supply->u_volt_max);
516 dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n",
517 __func__, supply->u_volt_min, supply->u_volt,
518 supply->u_volt_max, ret);
524 _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
525 unsigned long old_freq, unsigned long freq)
529 ret = clk_set_rate(clk, freq);
531 dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
538 static int _generic_set_opp_regulator(const struct opp_table *opp_table,
540 unsigned long old_freq,
542 struct dev_pm_opp_supply *old_supply,
543 struct dev_pm_opp_supply *new_supply)
545 struct regulator *reg = opp_table->regulators[0];
548 /* This function only supports single regulator per device */
549 if (WARN_ON(opp_table->regulator_count > 1)) {
550 dev_err(dev, "multiple regulators are not supported\n");
554 /* Scaling up? Scale voltage before frequency */
555 if (freq > old_freq) {
556 ret = _set_opp_voltage(dev, reg, new_supply);
558 goto restore_voltage;
561 /* Change frequency */
562 ret = _generic_set_opp_clk_only(dev, opp_table->clk, old_freq, freq);
564 goto restore_voltage;
566 /* Scaling down? Scale voltage after frequency */
567 if (freq < old_freq) {
568 ret = _set_opp_voltage(dev, reg, new_supply);
576 if (_generic_set_opp_clk_only(dev, opp_table->clk, freq, old_freq))
577 dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
580 /* This shouldn't harm even if the voltages weren't updated earlier */
582 _set_opp_voltage(dev, reg, old_supply);
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
592 * This configures the power-supplies and clock source to the levels specified
593 * by the OPP corresponding to the target_freq.
595 int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
597 struct opp_table *opp_table;
598 unsigned long freq, old_freq;
599 struct dev_pm_opp *old_opp, *opp;
603 if (unlikely(!target_freq)) {
604 dev_err(dev, "%s: Invalid target frequency %lu\n", __func__,
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);
615 clk = opp_table->clk;
617 dev_err(dev, "%s: No clock available for the device\n",
623 freq = clk_round_rate(clk, target_freq);
627 old_freq = clk_get_rate(clk);
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",
637 old_opp = _find_freq_ceil(opp_table, &old_freq);
638 if (IS_ERR(old_opp)) {
639 dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n",
640 __func__, old_freq, PTR_ERR(old_opp));
643 opp = _find_freq_ceil(opp_table, &freq);
646 dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
647 __func__, freq, ret);
651 dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__,
654 /* Only frequency scaling */
655 if (!opp_table->regulators) {
656 ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq);
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,
662 struct dev_pm_set_opp_data *data;
664 data = opp_table->set_opp_data;
665 data->regulators = opp_table->regulators;
666 data->regulator_count = opp_table->regulator_count;
670 data->old_opp.rate = old_freq;
671 size = sizeof(*opp->supplies) * opp_table->regulator_count;
673 memset(data->old_opp.supplies, 0, size);
675 memcpy(data->old_opp.supplies, old_opp->supplies, size);
677 data->new_opp.rate = freq;
678 memcpy(data->new_opp.supplies, opp->supplies, size);
680 ret = opp_table->set_opp(data);
685 if (!IS_ERR(old_opp))
686 dev_pm_opp_put(old_opp);
688 dev_pm_opp_put_opp_table(opp_table);
691 EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
693 /* OPP-dev Helpers */
694 static void _remove_opp_dev(struct opp_device *opp_dev,
695 struct opp_table *opp_table)
697 opp_debug_unregister(opp_dev, opp_table);
698 list_del(&opp_dev->node);
702 struct opp_device *_add_opp_dev(const struct device *dev,
703 struct opp_table *opp_table)
705 struct opp_device *opp_dev;
708 opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
712 /* Initialize opp-dev */
714 list_add(&opp_dev->node, &opp_table->dev_list);
716 /* Create debugfs entries for the opp_table */
717 ret = opp_debug_register(opp_dev, opp_table);
719 dev_err(dev, "%s: Failed to register opp debugfs (%d)\n",
725 static struct opp_table *_allocate_opp_table(struct device *dev)
727 struct opp_table *opp_table;
728 struct opp_device *opp_dev;
732 * Allocate a new OPP table. In the infrequent case where a new
733 * device is needed to be added, we pay this penalty.
735 opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
739 INIT_LIST_HEAD(&opp_table->dev_list);
741 opp_dev = _add_opp_dev(dev, opp_table);
747 _of_init_opp_table(opp_table, dev);
749 /* Find clk for the device */
750 opp_table->clk = clk_get(dev, NULL);
751 if (IS_ERR(opp_table->clk)) {
752 ret = PTR_ERR(opp_table->clk);
753 if (ret != -EPROBE_DEFER)
754 dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__,
758 BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
759 INIT_LIST_HEAD(&opp_table->opp_list);
760 mutex_init(&opp_table->lock);
761 kref_init(&opp_table->kref);
763 /* Secure the device table modification */
764 list_add(&opp_table->node, &opp_tables);
768 void _get_opp_table_kref(struct opp_table *opp_table)
770 kref_get(&opp_table->kref);
773 struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
775 struct opp_table *opp_table;
777 /* Hold our table modification lock here */
778 mutex_lock(&opp_table_lock);
780 opp_table = _find_opp_table_unlocked(dev);
781 if (!IS_ERR(opp_table))
784 opp_table = _allocate_opp_table(dev);
787 mutex_unlock(&opp_table_lock);
791 EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
793 static void _opp_table_kref_release(struct kref *kref)
795 struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
796 struct opp_device *opp_dev;
799 if (!IS_ERR(opp_table->clk))
800 clk_put(opp_table->clk);
802 opp_dev = list_first_entry(&opp_table->dev_list, struct opp_device,
805 _remove_opp_dev(opp_dev, opp_table);
807 /* dev_list must be empty now */
808 WARN_ON(!list_empty(&opp_table->dev_list));
810 mutex_destroy(&opp_table->lock);
811 list_del(&opp_table->node);
814 mutex_unlock(&opp_table_lock);
817 void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
819 kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
822 EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
824 void _opp_free(struct dev_pm_opp *opp)
829 static void _opp_kref_release(struct kref *kref)
831 struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
832 struct opp_table *opp_table = opp->opp_table;
835 * Notify the changes in the availability of the operable
836 * frequency/voltage list.
838 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
839 opp_debug_remove_one(opp);
840 list_del(&opp->node);
843 mutex_unlock(&opp_table->lock);
844 dev_pm_opp_put_opp_table(opp_table);
847 static void dev_pm_opp_get(struct dev_pm_opp *opp)
849 kref_get(&opp->kref);
852 void dev_pm_opp_put(struct dev_pm_opp *opp)
854 kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock);
856 EXPORT_SYMBOL_GPL(dev_pm_opp_put);
859 * dev_pm_opp_remove() - Remove an OPP from OPP table
860 * @dev: device for which we do this operation
861 * @freq: OPP to remove with matching 'freq'
863 * This function removes an opp from the opp table.
865 void dev_pm_opp_remove(struct device *dev, unsigned long freq)
867 struct dev_pm_opp *opp;
868 struct opp_table *opp_table;
871 opp_table = _find_opp_table(dev);
872 if (IS_ERR(opp_table))
875 mutex_lock(&opp_table->lock);
877 list_for_each_entry(opp, &opp_table->opp_list, node) {
878 if (opp->rate == freq) {
884 mutex_unlock(&opp_table->lock);
889 dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
893 dev_pm_opp_put_opp_table(opp_table);
895 EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
897 struct dev_pm_opp *_opp_allocate(struct opp_table *table)
899 struct dev_pm_opp *opp;
900 int count, supply_size;
902 /* Allocate space for at least one supply */
903 count = table->regulator_count ? table->regulator_count : 1;
904 supply_size = sizeof(*opp->supplies) * count;
906 /* allocate new OPP node and supplies structures */
907 opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL);
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);
918 static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
919 struct opp_table *opp_table)
921 struct regulator *reg;
924 for (i = 0; i < opp_table->regulator_count; i++) {
925 reg = opp_table->regulators[i];
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);
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().
950 int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
951 struct opp_table *opp_table)
953 struct dev_pm_opp *opp;
954 struct list_head *head;
958 * Insert new OPP in order of increasing frequency and discard if
961 * Need to use &opp_table->opp_list in the condition part of the 'for'
962 * loop, don't replace it with head otherwise it will become an infinite
965 mutex_lock(&opp_table->lock);
966 head = &opp_table->opp_list;
968 list_for_each_entry(opp, &opp_table->opp_list, node) {
969 if (new_opp->rate > opp->rate) {
974 if (new_opp->rate < opp->rate)
978 dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
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);
983 /* Should we compare voltages for all regulators here ? */
984 ret = opp->available &&
985 new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST;
987 mutex_unlock(&opp_table->lock);
991 list_add(&new_opp->node, head);
992 mutex_unlock(&opp_table->lock);
994 new_opp->opp_table = opp_table;
995 kref_init(&new_opp->kref);
997 /* Get a reference to the OPP table */
998 _get_opp_table_kref(opp_table);
1000 ret = opp_debug_create_one(new_opp, opp_table);
1002 dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n",
1005 if (!_opp_supported_by_regulators(new_opp, opp_table)) {
1006 new_opp->available = false;
1007 dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
1008 __func__, new_opp->rate);
1015 * _opp_add_v1() - Allocate a OPP based on v1 bindings.
1016 * @opp_table: OPP table
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.
1022 * This function adds an opp definition to the opp table and returns status.
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.
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.
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
1036 int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
1037 unsigned long freq, long u_volt, bool dynamic)
1039 struct dev_pm_opp *new_opp;
1043 new_opp = _opp_allocate(opp_table);
1047 /* populate the opp table */
1048 new_opp->rate = freq;
1049 tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
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;
1053 new_opp->available = true;
1054 new_opp->dynamic = dynamic;
1056 ret = _opp_add(dev, new_opp, opp_table);
1058 /* Don't return error for duplicate OPPs */
1065 * Notify the changes in the availability of the operable
1066 * frequency/voltage list.
1068 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
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.
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'
1088 struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
1089 const u32 *versions, unsigned int count)
1091 struct opp_table *opp_table;
1094 opp_table = dev_pm_opp_get_opp_table(dev);
1096 return ERR_PTR(-ENOMEM);
1098 /* Make sure there are no concurrent readers while updating opp_table */
1099 WARN_ON(!list_empty(&opp_table->opp_list));
1101 /* Do we already have a version hierarchy associated with opp_table? */
1102 if (opp_table->supported_hw) {
1103 dev_err(dev, "%s: Already have supported hardware list\n",
1109 opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
1111 if (!opp_table->supported_hw) {
1116 opp_table->supported_hw_count = count;
1121 dev_pm_opp_put_opp_table(opp_table);
1123 return ERR_PTR(ret);
1125 EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
1128 * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw
1129 * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw().
1131 * This is required only for the V2 bindings, and is called for a matching
1132 * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure
1133 * will not be freed.
1135 void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
1137 /* Make sure there are no concurrent readers while updating opp_table */
1138 WARN_ON(!list_empty(&opp_table->opp_list));
1140 if (!opp_table->supported_hw) {
1141 pr_err("%s: Doesn't have supported hardware list\n",
1146 kfree(opp_table->supported_hw);
1147 opp_table->supported_hw = NULL;
1148 opp_table->supported_hw_count = 0;
1150 dev_pm_opp_put_opp_table(opp_table);
1152 EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
1155 * dev_pm_opp_set_prop_name() - Set prop-extn name
1156 * @dev: Device for which the prop-name has to be set.
1157 * @name: name to postfix to properties.
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.
1164 struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
1166 struct opp_table *opp_table;
1169 opp_table = dev_pm_opp_get_opp_table(dev);
1171 return ERR_PTR(-ENOMEM);
1173 /* Make sure there are no concurrent readers while updating opp_table */
1174 WARN_ON(!list_empty(&opp_table->opp_list));
1176 /* Do we already have a prop-name associated with opp_table? */
1177 if (opp_table->prop_name) {
1178 dev_err(dev, "%s: Already have prop-name %s\n", __func__,
1179 opp_table->prop_name);
1184 opp_table->prop_name = kstrdup(name, GFP_KERNEL);
1185 if (!opp_table->prop_name) {
1193 dev_pm_opp_put_opp_table(opp_table);
1195 return ERR_PTR(ret);
1197 EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
1200 * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name
1201 * @opp_table: OPP table returned by dev_pm_opp_set_prop_name().
1203 * This is required only for the V2 bindings, and is called for a matching
1204 * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure
1205 * will not be freed.
1207 void dev_pm_opp_put_prop_name(struct opp_table *opp_table)
1209 /* Make sure there are no concurrent readers while updating opp_table */
1210 WARN_ON(!list_empty(&opp_table->opp_list));
1212 if (!opp_table->prop_name) {
1213 pr_err("%s: Doesn't have a prop-name\n", __func__);
1217 kfree(opp_table->prop_name);
1218 opp_table->prop_name = NULL;
1220 dev_pm_opp_put_opp_table(opp_table);
1222 EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
1224 static int _allocate_set_opp_data(struct opp_table *opp_table)
1226 struct dev_pm_set_opp_data *data;
1227 int len, count = opp_table->regulator_count;
1229 if (WARN_ON(!count))
1232 /* space for set_opp_data */
1233 len = sizeof(*data);
1235 /* space for old_opp.supplies and new_opp.supplies */
1236 len += 2 * sizeof(struct dev_pm_opp_supply) * count;
1238 data = kzalloc(len, GFP_KERNEL);
1242 data->old_opp.supplies = (void *)(data + 1);
1243 data->new_opp.supplies = data->old_opp.supplies + count;
1245 opp_table->set_opp_data = data;
1250 static void _free_set_opp_data(struct opp_table *opp_table)
1252 kfree(opp_table->set_opp_data);
1253 opp_table->set_opp_data = NULL;
1257 * dev_pm_opp_set_regulators() - Set regulator names for the device
1258 * @dev: Device for which regulator name is being set.
1259 * @names: Array of pointers to the names of the regulator.
1260 * @count: Number of regulators.
1262 * In order to support OPP switching, OPP layer needs to know the name of the
1263 * device's regulators, as the core would be required to switch voltages as
1266 * This must be called before any OPPs are initialized for the device.
1268 struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
1269 const char * const names[],
1272 struct opp_table *opp_table;
1273 struct regulator *reg;
1276 opp_table = dev_pm_opp_get_opp_table(dev);
1278 return ERR_PTR(-ENOMEM);
1280 /* This should be called before OPPs are initialized */
1281 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1286 /* Already have regulators set */
1287 if (opp_table->regulators) {
1292 opp_table->regulators = kmalloc_array(count,
1293 sizeof(*opp_table->regulators),
1295 if (!opp_table->regulators) {
1300 for (i = 0; i < count; i++) {
1301 reg = regulator_get_optional(dev, names[i]);
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;
1310 opp_table->regulators[i] = reg;
1313 opp_table->regulator_count = count;
1315 /* Allocate block only once to pass to set_opp() routines */
1316 ret = _allocate_set_opp_data(opp_table);
1318 goto free_regulators;
1324 regulator_put(opp_table->regulators[--i]);
1326 kfree(opp_table->regulators);
1327 opp_table->regulators = NULL;
1328 opp_table->regulator_count = 0;
1330 dev_pm_opp_put_opp_table(opp_table);
1332 return ERR_PTR(ret);
1334 EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);
1337 * dev_pm_opp_put_regulators() - Releases resources blocked for regulator
1338 * @opp_table: OPP table returned from dev_pm_opp_set_regulators().
1340 void dev_pm_opp_put_regulators(struct opp_table *opp_table)
1344 if (!opp_table->regulators) {
1345 pr_err("%s: Doesn't have regulators set\n", __func__);
1349 /* Make sure there are no concurrent readers while updating opp_table */
1350 WARN_ON(!list_empty(&opp_table->opp_list));
1352 for (i = opp_table->regulator_count - 1; i >= 0; i--)
1353 regulator_put(opp_table->regulators[i]);
1355 _free_set_opp_data(opp_table);
1357 kfree(opp_table->regulators);
1358 opp_table->regulators = NULL;
1359 opp_table->regulator_count = 0;
1361 dev_pm_opp_put_opp_table(opp_table);
1363 EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);
1366 * dev_pm_opp_set_clkname() - Set clk name for the device
1367 * @dev: Device for which clk name is being set.
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.
1375 * This must be called before any OPPs are initialized for the device.
1377 struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
1379 struct opp_table *opp_table;
1382 opp_table = dev_pm_opp_get_opp_table(dev);
1384 return ERR_PTR(-ENOMEM);
1386 /* This should be called before OPPs are initialized */
1387 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1392 /* Already have default clk set, free it */
1393 if (!IS_ERR(opp_table->clk))
1394 clk_put(opp_table->clk);
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__,
1410 dev_pm_opp_put_opp_table(opp_table);
1412 return ERR_PTR(ret);
1414 EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);
1417 * dev_pm_opp_put_clkname() - Releases resources blocked for clk.
1418 * @opp_table: OPP table returned from dev_pm_opp_set_clkname().
1420 void dev_pm_opp_put_clkname(struct opp_table *opp_table)
1422 /* Make sure there are no concurrent readers while updating opp_table */
1423 WARN_ON(!list_empty(&opp_table->opp_list));
1425 clk_put(opp_table->clk);
1426 opp_table->clk = ERR_PTR(-EINVAL);
1428 dev_pm_opp_put_opp_table(opp_table);
1430 EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
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.
1437 * This is useful to support complex platforms (like platforms with multiple
1438 * regulators per device), instead of the generic OPP set rate helper.
1440 * This must be called before any OPPs are initialized for the device.
1442 struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
1443 int (*set_opp)(struct dev_pm_set_opp_data *data))
1445 struct opp_table *opp_table;
1449 return ERR_PTR(-EINVAL);
1451 opp_table = dev_pm_opp_get_opp_table(dev);
1453 return ERR_PTR(-ENOMEM);
1455 /* This should be called before OPPs are initialized */
1456 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1461 /* Already have custom set_opp helper */
1462 if (WARN_ON(opp_table->set_opp)) {
1467 opp_table->set_opp = set_opp;
1472 dev_pm_opp_put_opp_table(opp_table);
1474 return ERR_PTR(ret);
1476 EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper);
1479 * dev_pm_opp_register_put_opp_helper() - Releases resources blocked for
1481 * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper().
1483 * Release resources blocked for platform specific set_opp helper.
1485 void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table)
1487 if (!opp_table->set_opp) {
1488 pr_err("%s: Doesn't have custom set_opp helper set\n",
1493 /* Make sure there are no concurrent readers while updating opp_table */
1494 WARN_ON(!list_empty(&opp_table->opp_list));
1496 opp_table->set_opp = NULL;
1498 dev_pm_opp_put_opp_table(opp_table);
1500 EXPORT_SYMBOL_GPL(dev_pm_opp_register_put_opp_helper);
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
1508 * This function adds an opp definition to the opp table and returns status.
1509 * The opp is made available by default and it can be controlled using
1510 * dev_pm_opp_enable/disable functions.
1514 * Duplicate OPPs (both freq and volt are same) and opp->available
1515 * -EEXIST Freq are same and volt are different OR
1516 * Duplicate OPPs (both freq and volt are same) and !opp->available
1517 * -ENOMEM Memory allocation failure
1519 int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
1521 struct opp_table *opp_table;
1524 opp_table = dev_pm_opp_get_opp_table(dev);
1528 ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
1530 dev_pm_opp_put_opp_table(opp_table);
1533 EXPORT_SYMBOL_GPL(dev_pm_opp_add);
1536 * _opp_set_availability() - helper to set the availability of an opp
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
1541 * Set the availability of an OPP, opp_{enable,disable} share a common logic
1542 * which is isolated here.
1544 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
1545 * copy operation, returns 0 if no modification was done OR modification was
1548 static int _opp_set_availability(struct device *dev, unsigned long freq,
1549 bool availability_req)
1551 struct opp_table *opp_table;
1552 struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
1555 /* Find the opp_table */
1556 opp_table = _find_opp_table(dev);
1557 if (IS_ERR(opp_table)) {
1558 r = PTR_ERR(opp_table);
1559 dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
1563 mutex_lock(&opp_table->lock);
1565 /* Do we have the frequency? */
1566 list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
1567 if (tmp_opp->rate == freq) {
1578 /* Is update really needed? */
1579 if (opp->available == availability_req)
1582 opp->available = availability_req;
1584 dev_pm_opp_get(opp);
1585 mutex_unlock(&opp_table->lock);
1587 /* Notify the change of the OPP availability */
1588 if (availability_req)
1589 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
1592 blocking_notifier_call_chain(&opp_table->head,
1593 OPP_EVENT_DISABLE, opp);
1595 dev_pm_opp_put(opp);
1599 mutex_unlock(&opp_table->lock);
1601 dev_pm_opp_put_opp_table(opp_table);
1606 * dev_pm_opp_enable() - Enable a specific OPP
1607 * @dev: device for which we do this operation
1608 * @freq: OPP frequency to enable
1610 * Enables a provided opp. If the operation is valid, this returns 0, else the
1611 * corresponding error value. It is meant to be used for users an OPP available
1612 * after being temporarily made unavailable with dev_pm_opp_disable.
1614 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
1615 * copy operation, returns 0 if no modification was done OR modification was
1618 int dev_pm_opp_enable(struct device *dev, unsigned long freq)
1620 return _opp_set_availability(dev, freq, true);
1622 EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
1625 * dev_pm_opp_disable() - Disable a specific OPP
1626 * @dev: device for which we do this operation
1627 * @freq: OPP frequency to disable
1629 * Disables a provided opp. If the operation is valid, this returns
1630 * 0, else the corresponding error value. It is meant to be a temporary
1631 * control by users to make this OPP not available until the circumstances are
1632 * right to make it available again (with a call to dev_pm_opp_enable).
1634 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
1635 * copy operation, returns 0 if no modification was done OR modification was
1638 int dev_pm_opp_disable(struct device *dev, unsigned long freq)
1640 return _opp_set_availability(dev, freq, false);
1642 EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
1645 * dev_pm_opp_register_notifier() - Register OPP notifier for the device
1646 * @dev: Device for which notifier needs to be registered
1647 * @nb: Notifier block to be registered
1649 * Return: 0 on success or a negative error value.
1651 int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
1653 struct opp_table *opp_table;
1656 opp_table = _find_opp_table(dev);
1657 if (IS_ERR(opp_table))
1658 return PTR_ERR(opp_table);
1660 ret = blocking_notifier_chain_register(&opp_table->head, nb);
1662 dev_pm_opp_put_opp_table(opp_table);
1666 EXPORT_SYMBOL(dev_pm_opp_register_notifier);
1669 * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device
1670 * @dev: Device for which notifier needs to be unregistered
1671 * @nb: Notifier block to be unregistered
1673 * Return: 0 on success or a negative error value.
1675 int dev_pm_opp_unregister_notifier(struct device *dev,
1676 struct notifier_block *nb)
1678 struct opp_table *opp_table;
1681 opp_table = _find_opp_table(dev);
1682 if (IS_ERR(opp_table))
1683 return PTR_ERR(opp_table);
1685 ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
1687 dev_pm_opp_put_opp_table(opp_table);
1691 EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
1694 * Free OPPs either created using static entries present in DT or even the
1695 * dynamically added entries based on remove_all param.
1697 void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev,
1700 struct dev_pm_opp *opp, *tmp;
1702 /* Find if opp_table manages a single device */
1703 if (list_is_singular(&opp_table->dev_list)) {
1704 /* Free static OPPs */
1705 list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
1706 if (remove_all || !opp->dynamic)
1707 dev_pm_opp_put(opp);
1710 _remove_opp_dev(_find_opp_dev(dev, opp_table), opp_table);
1714 void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all)
1716 struct opp_table *opp_table;
1718 /* Check for existing table for 'dev' */
1719 opp_table = _find_opp_table(dev);
1720 if (IS_ERR(opp_table)) {
1721 int error = PTR_ERR(opp_table);
1723 if (error != -ENODEV)
1724 WARN(1, "%s: opp_table: %d\n",
1725 IS_ERR_OR_NULL(dev) ?
1726 "Invalid device" : dev_name(dev),
1731 _dev_pm_opp_remove_table(opp_table, dev, remove_all);
1733 dev_pm_opp_put_opp_table(opp_table);
1737 * dev_pm_opp_remove_table() - Free all OPPs associated with the device
1738 * @dev: device pointer used to lookup OPP table.
1740 * Free both OPPs created using static entries present in DT and the
1741 * dynamically added entries.
1743 void dev_pm_opp_remove_table(struct device *dev)
1745 _dev_pm_opp_find_and_remove_table(dev, true);
1747 EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);