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authorViresh Kumar <viresh.kumar@linaro.org>2017-09-26 18:12:40 -0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-10-02 20:45:12 -0400
commit7813dd6fc75fb375d4caf002e7f80a826fc3153a (patch)
tree37326fb95800c931382c3abda492d207c81aef41 /drivers/opp
parent9e66317d3c92ddaab330c125dfe9d06eee268aff (diff)
PM / OPP: Move the OPP directory out of power/
The drivers/base/power/ directory is special and contains code related to power management core like system suspend/resume, hibernation, etc. It was fine to keep the OPP code inside it when we had just one file for it, but it is growing now and already has a directory for itself. Lets move it directly under drivers/ directory, just like cpufreq and cpuidle. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/Kconfig13
-rw-r--r--drivers/opp/Makefile4
-rw-r--r--drivers/opp/core.c1747
-rw-r--r--drivers/opp/cpu.c236
-rw-r--r--drivers/opp/debugfs.c249
-rw-r--r--drivers/opp/of.c633
-rw-r--r--drivers/opp/opp.h222
7 files changed, 3104 insertions, 0 deletions
diff --git a/drivers/opp/Kconfig b/drivers/opp/Kconfig
new file mode 100644
index 000000000000..a7fbb93f302c
--- /dev/null
+++ b/drivers/opp/Kconfig
@@ -0,0 +1,13 @@
1config PM_OPP
2 bool
3 select SRCU
4 ---help---
5 SOCs have a standard set of tuples consisting of frequency and
6 voltage pairs that the device will support per voltage domain. This
7 is called Operating Performance Point or OPP. The actual definitions
8 of OPP varies over silicon within the same family of devices.
9
10 OPP layer organizes the data internally using device pointers
11 representing individual voltage domains and provides SOC
12 implementations a ready to use framework to manage OPPs.
13 For more information, read <file:Documentation/power/opp.txt>
diff --git a/drivers/opp/Makefile b/drivers/opp/Makefile
new file mode 100644
index 000000000000..e70ceb406fe9
--- /dev/null
+++ b/drivers/opp/Makefile
@@ -0,0 +1,4 @@
1ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
2obj-y += core.o cpu.o
3obj-$(CONFIG_OF) += of.o
4obj-$(CONFIG_DEBUG_FS) += debugfs.o
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
new file mode 100644
index 000000000000..a6de32530693
--- /dev/null
+++ b/drivers/opp/core.c
@@ -0,0 +1,1747 @@
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
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
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>
23
24#include "opp.h"
25
26/*
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.
30 */
31LIST_HEAD(opp_tables);
32/* Lock to allow exclusive modification to the device and opp lists */
33DEFINE_MUTEX(opp_table_lock);
34
35static void dev_pm_opp_get(struct dev_pm_opp *opp);
36
37static struct opp_device *_find_opp_dev(const struct device *dev,
38 struct opp_table *opp_table)
39{
40 struct opp_device *opp_dev;
41
42 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
43 if (opp_dev->dev == dev)
44 return opp_dev;
45
46 return NULL;
47}
48
49static struct opp_table *_find_opp_table_unlocked(struct device *dev)
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
64/**
65 * _find_opp_table() - find opp_table struct using device pointer
66 * @dev: device pointer used to lookup OPP table
67 *
68 * Search OPP table for one containing matching device.
69 *
70 * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
71 * -EINVAL based on type of error.
72 *
73 * The callers must call dev_pm_opp_put_opp_table() after the table is used.
74 */
75struct opp_table *_find_opp_table(struct device *dev)
76{
77 struct opp_table *opp_table;
78
79 if (IS_ERR_OR_NULL(dev)) {
80 pr_err("%s: Invalid parameters\n", __func__);
81 return ERR_PTR(-EINVAL);
82 }
83
84 mutex_lock(&opp_table_lock);
85 opp_table = _find_opp_table_unlocked(dev);
86 mutex_unlock(&opp_table_lock);
87
88 return opp_table;
89}
90
91/**
92 * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
93 * @opp: opp for which voltage has to be returned for
94 *
95 * Return: voltage in micro volt corresponding to the opp, else
96 * return 0
97 *
98 * This is useful only for devices with single power supply.
99 */
100unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
101{
102 if (IS_ERR_OR_NULL(opp)) {
103 pr_err("%s: Invalid parameters\n", __func__);
104 return 0;
105 }
106
107 return opp->supplies[0].u_volt;
108}
109EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
110
111/**
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
114 *
115 * Return: frequency in hertz corresponding to the opp, else
116 * return 0
117 */
118unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
119{
120 if (IS_ERR_OR_NULL(opp) || !opp->available) {
121 pr_err("%s: Invalid parameters\n", __func__);
122 return 0;
123 }
124
125 return opp->rate;
126}
127EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
128
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.
138 */
139bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
140{
141 if (IS_ERR_OR_NULL(opp) || !opp->available) {
142 pr_err("%s: Invalid parameters\n", __func__);
143 return false;
144 }
145
146 return opp->turbo;
147}
148EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
149
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.
155 */
156unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
157{
158 struct opp_table *opp_table;
159 unsigned long clock_latency_ns;
160
161 opp_table = _find_opp_table(dev);
162 if (IS_ERR(opp_table))
163 return 0;
164
165 clock_latency_ns = opp_table->clock_latency_ns_max;
166
167 dev_pm_opp_put_opp_table(opp_table);
168
169 return clock_latency_ns;
170}
171EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
172
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.
178 */
179unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
180{
181 struct opp_table *opp_table;
182 struct dev_pm_opp *opp;
183 struct regulator *reg;
184 unsigned long latency_ns = 0;
185 int ret, i, count;
186 struct {
187 unsigned long min;
188 unsigned long max;
189 } *uV;
190
191 opp_table = _find_opp_table(dev);
192 if (IS_ERR(opp_table))
193 return 0;
194
195 count = opp_table->regulator_count;
196
197 /* Regulator may not be required for the device */
198 if (!count)
199 goto put_opp_table;
200
201 uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
202 if (!uV)
203 goto put_opp_table;
204
205 mutex_lock(&opp_table->lock);
206
207 for (i = 0; i < count; i++) {
208 uV[i].min = ~0;
209 uV[i].max = 0;
210
211 list_for_each_entry(opp, &opp_table->opp_list, node) {
212 if (!opp->available)
213 continue;
214
215 if (opp->supplies[i].u_volt_min < uV[i].min)
216 uV[i].min = opp->supplies[i].u_volt_min;
217 if (opp->supplies[i].u_volt_max > uV[i].max)
218 uV[i].max = opp->supplies[i].u_volt_max;
219 }
220 }
221
222 mutex_unlock(&opp_table->lock);
223
224 /*
225 * The caller needs to ensure that opp_table (and hence the regulator)
226 * isn't freed, while we are executing this routine.
227 */
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);
231 if (ret > 0)
232 latency_ns += ret * 1000;
233 }
234
235 kfree(uV);
236put_opp_table:
237 dev_pm_opp_put_opp_table(opp_table);
238
239 return latency_ns;
240}
241EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
242
243/**
244 * dev_pm_opp_get_max_transition_latency() - Get max transition latency in
245 * nanoseconds
246 * @dev: device for which we do this operation
247 *
248 * Return: This function returns the max transition latency, in nanoseconds, to
249 * switch from one OPP to other.
250 */
251unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
252{
253 return dev_pm_opp_get_max_volt_latency(dev) +
254 dev_pm_opp_get_max_clock_latency(dev);
255}
256EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
257
258/**
259 * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
260 * @dev: device for which we do this operation
261 *
262 * Return: This function returns the frequency of the OPP marked as suspend_opp
263 * if one is available, else returns 0;
264 */
265unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
266{
267 struct opp_table *opp_table;
268 unsigned long freq = 0;
269
270 opp_table = _find_opp_table(dev);
271 if (IS_ERR(opp_table))
272 return 0;
273
274 if (opp_table->suspend_opp && opp_table->suspend_opp->available)
275 freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
276
277 dev_pm_opp_put_opp_table(opp_table);
278
279 return freq;
280}
281EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
282
283/**
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
286 *
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.
289 */
290int dev_pm_opp_get_opp_count(struct device *dev)
291{
292 struct opp_table *opp_table;
293 struct dev_pm_opp *temp_opp;
294 int count = 0;
295
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",
300 __func__, count);
301 return count;
302 }
303
304 mutex_lock(&opp_table->lock);
305
306 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
307 if (temp_opp->available)
308 count++;
309 }
310
311 mutex_unlock(&opp_table->lock);
312 dev_pm_opp_put_opp_table(opp_table);
313
314 return count;
315}
316EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
317
318/**
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
323 *
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
330 *
331 * Note: available is a modifier for the search. if available=true, then the
332 * match is for exact matching frequency and is available in the stored OPP
333 * table. if false, the match is for exact frequency which is not available.
334 *
335 * This provides a mechanism to enable an opp which is not available currently
336 * or the opposite as well.
337 *
338 * The callers are required to call dev_pm_opp_put() for the returned OPP after
339 * use.
340 */
341struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
342 unsigned long freq,
343 bool available)
344{
345 struct opp_table *opp_table;
346 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
347
348 opp_table = _find_opp_table(dev);
349 if (IS_ERR(opp_table)) {
350 int r = PTR_ERR(opp_table);
351
352 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
353 return ERR_PTR(r);
354 }
355
356 mutex_lock(&opp_table->lock);
357
358 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
359 if (temp_opp->available == available &&
360 temp_opp->rate == freq) {
361 opp = temp_opp;
362
363 /* Increment the reference count of OPP */
364 dev_pm_opp_get(opp);
365 break;
366 }
367 }
368
369 mutex_unlock(&opp_table->lock);
370 dev_pm_opp_put_opp_table(opp_table);
371
372 return opp;
373}
374EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
375
376static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
377 unsigned long *freq)
378{
379 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
380
381 mutex_lock(&opp_table->lock);
382
383 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
384 if (temp_opp->available && temp_opp->rate >= *freq) {
385 opp = temp_opp;
386 *freq = opp->rate;
387
388 /* Increment the reference count of OPP */
389 dev_pm_opp_get(opp);
390 break;
391 }
392 }
393
394 mutex_unlock(&opp_table->lock);
395
396 return opp;
397}
398
399/**
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
403 *
404 * Search for the matching ceil *available* OPP from a starting freq
405 * for a device.
406 *
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
409 * values can be:
410 * EINVAL: for bad pointer
411 * ERANGE: no match found for search
412 * ENODEV: if device not found in list of registered devices
413 *
414 * The callers are required to call dev_pm_opp_put() for the returned OPP after
415 * use.
416 */
417struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
418 unsigned long *freq)
419{
420 struct opp_table *opp_table;
421 struct dev_pm_opp *opp;
422
423 if (!dev || !freq) {
424 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
425 return ERR_PTR(-EINVAL);
426 }
427
428 opp_table = _find_opp_table(dev);
429 if (IS_ERR(opp_table))
430 return ERR_CAST(opp_table);
431
432 opp = _find_freq_ceil(opp_table, freq);
433
434 dev_pm_opp_put_opp_table(opp_table);
435
436 return opp;
437}
438EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
439
440/**
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
444 *
445 * Search for the matching floor *available* OPP from a starting freq
446 * for a device.
447 *
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
450 * values can be:
451 * EINVAL: for bad pointer
452 * ERANGE: no match found for search
453 * ENODEV: if device not found in list of registered devices
454 *
455 * The callers are required to call dev_pm_opp_put() for the returned OPP after
456 * use.
457 */
458struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
459 unsigned long *freq)
460{
461 struct opp_table *opp_table;
462 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
463
464 if (!dev || !freq) {
465 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
466 return ERR_PTR(-EINVAL);
467 }
468
469 opp_table = _find_opp_table(dev);
470 if (IS_ERR(opp_table))
471 return ERR_CAST(opp_table);
472
473 mutex_lock(&opp_table->lock);
474
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)
479 break;
480 else
481 opp = temp_opp;
482 }
483 }
484
485 /* Increment the reference count of OPP */
486 if (!IS_ERR(opp))
487 dev_pm_opp_get(opp);
488 mutex_unlock(&opp_table->lock);
489 dev_pm_opp_put_opp_table(opp_table);
490
491 if (!IS_ERR(opp))
492 *freq = opp->rate;
493
494 return opp;
495}
496EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
497
498static int _set_opp_voltage(struct device *dev, struct regulator *reg,
499 struct dev_pm_opp_supply *supply)
500{
501 int ret;
502
503 /* Regulator not available for device */
504 if (IS_ERR(reg)) {
505 dev_dbg(dev, "%s: regulator not available: %ld\n", __func__,
506 PTR_ERR(reg));
507 return 0;
508 }
509
510 dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__,
511 supply->u_volt_min, supply->u_volt, supply->u_volt_max);
512
513 ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
514 supply->u_volt, supply->u_volt_max);
515 if (ret)
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);
519
520 return ret;
521}
522
523static inline int
524_generic_set_opp_clk_only(struct device *dev, struct clk *clk,
525 unsigned long old_freq, unsigned long freq)
526{
527 int ret;
528
529 ret = clk_set_rate(clk, freq);
530 if (ret) {
531 dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
532 ret);
533 }
534
535 return ret;
536}
537
538static int _generic_set_opp_regulator(const struct opp_table *opp_table,
539 struct device *dev,
540 unsigned long old_freq,
541 unsigned long freq,
542 struct dev_pm_opp_supply *old_supply,
543 struct dev_pm_opp_supply *new_supply)
544{
545 struct regulator *reg = opp_table->regulators[0];
546 int ret;
547
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");
551 return -EINVAL;
552 }
553
554 /* Scaling up? Scale voltage before frequency */
555 if (freq > old_freq) {
556 ret = _set_opp_voltage(dev, reg, new_supply);
557 if (ret)
558 goto restore_voltage;
559 }
560
561 /* Change frequency */
562 ret = _generic_set_opp_clk_only(dev, opp_table->clk, old_freq, freq);
563 if (ret)
564 goto restore_voltage;
565
566 /* Scaling down? Scale voltage after frequency */
567 if (freq < old_freq) {
568 ret = _set_opp_voltage(dev, reg, new_supply);
569 if (ret)
570 goto restore_freq;
571 }
572
573 return 0;
574
575restore_freq:
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",
578 __func__, old_freq);
579restore_voltage:
580 /* This shouldn't harm even if the voltages weren't updated earlier */
581 if (old_supply)
582 _set_opp_voltage(dev, reg, old_supply);
583
584 return ret;
585}
586
587/**
588 * dev_pm_opp_set_rate() - Configure new OPP based on frequency
589 * @dev: device for which we do this operation
590 * @target_freq: frequency to achieve
591 *
592 * This configures the power-supplies and clock source to the levels specified
593 * by the OPP corresponding to the target_freq.
594 */
595int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
596{
597 struct opp_table *opp_table;
598 unsigned long freq, old_freq;
599 struct dev_pm_opp *old_opp, *opp;
600 struct clk *clk;
601 int ret, size;
602
603 if (unlikely(!target_freq)) {
604 dev_err(dev, "%s: Invalid target frequency %lu\n", __func__,
605 target_freq);
606 return -EINVAL;
607 }
608
609 opp_table = _find_opp_table(dev);
610 if (IS_ERR(opp_table)) {
611 dev_err(dev, "%s: device opp doesn't exist\n", __func__);
612 return PTR_ERR(opp_table);
613 }
614
615 clk = opp_table->clk;
616 if (IS_ERR(clk)) {
617 dev_err(dev, "%s: No clock available for the device\n",
618 __func__);
619 ret = PTR_ERR(clk);
620 goto put_opp_table;
621 }
622
623 freq = clk_round_rate(clk, target_freq);
624 if ((long)freq <= 0)
625 freq = target_freq;
626
627 old_freq = clk_get_rate(clk);
628
629 /* Return early if nothing to do */
630 if (old_freq == freq) {
631 dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n",
632 __func__, freq);
633 ret = 0;
634 goto put_opp_table;
635 }
636
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));
641 }
642
643 opp = _find_freq_ceil(opp_table, &freq);
644 if (IS_ERR(opp)) {
645 ret = PTR_ERR(opp);
646 dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
647 __func__, freq, ret);
648 goto put_old_opp;
649 }
650
651 dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__,
652 old_freq, freq);
653
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,
660 opp->supplies);
661 } else {
662 struct dev_pm_set_opp_data *data;
663
664 data = opp_table->set_opp_data;
665 data->regulators = opp_table->regulators;
666 data->regulator_count = opp_table->regulator_count;
667 data->clk = clk;
668 data->dev = dev;
669
670 data->old_opp.rate = old_freq;
671 size = sizeof(*opp->supplies) * opp_table->regulator_count;
672 if (IS_ERR(old_opp))
673 memset(data->old_opp.supplies, 0, size);
674 else
675 memcpy(data->old_opp.supplies, old_opp->supplies, size);
676
677 data->new_opp.rate = freq;
678 memcpy(data->new_opp.supplies, opp->supplies, size);
679
680 ret = opp_table->set_opp(data);
681 }
682
683 dev_pm_opp_put(opp);
684put_old_opp:
685 if (!IS_ERR(old_opp))
686 dev_pm_opp_put(old_opp);
687put_opp_table:
688 dev_pm_opp_put_opp_table(opp_table);
689 return ret;
690}
691EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
692
693/* OPP-dev Helpers */
694static void _remove_opp_dev(struct opp_device *opp_dev,
695 struct opp_table *opp_table)
696{
697 opp_debug_unregister(opp_dev, opp_table);
698 list_del(&opp_dev->node);
699 kfree(opp_dev);
700}
701
702struct opp_device *_add_opp_dev(const struct device *dev,
703 struct opp_table *opp_table)
704{
705 struct opp_device *opp_dev;
706 int ret;
707
708 opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
709 if (!opp_dev)
710 return NULL;
711
712 /* Initialize opp-dev */
713 opp_dev->dev = dev;
714 list_add(&opp_dev->node, &opp_table->dev_list);
715
716 /* Create debugfs entries for the opp_table */
717 ret = opp_debug_register(opp_dev, opp_table);
718 if (ret)
719 dev_err(dev, "%s: Failed to register opp debugfs (%d)\n",
720 __func__, ret);
721
722 return opp_dev;
723}
724
725static struct opp_table *_allocate_opp_table(struct device *dev)
726{
727 struct opp_table *opp_table;
728 struct opp_device *opp_dev;
729 int ret;
730
731 /*
732 * Allocate a new OPP table. In the infrequent case where a new
733 * device is needed to be added, we pay this penalty.
734 */
735 opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
736 if (!opp_table)
737 return NULL;
738
739 INIT_LIST_HEAD(&opp_table->dev_list);
740
741 opp_dev = _add_opp_dev(dev, opp_table);
742 if (!opp_dev) {
743 kfree(opp_table);
744 return NULL;
745 }
746
747 _of_init_opp_table(opp_table, dev);
748
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__,
755 ret);
756 }
757
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);
762
763 /* Secure the device table modification */
764 list_add(&opp_table->node, &opp_tables);
765 return opp_table;
766}
767
768void _get_opp_table_kref(struct opp_table *opp_table)
769{
770 kref_get(&opp_table->kref);
771}
772
773struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
774{
775 struct opp_table *opp_table;
776
777 /* Hold our table modification lock here */
778 mutex_lock(&opp_table_lock);
779
780 opp_table = _find_opp_table_unlocked(dev);
781 if (!IS_ERR(opp_table))
782 goto unlock;
783
784 opp_table = _allocate_opp_table(dev);
785
786unlock:
787 mutex_unlock(&opp_table_lock);
788
789 return opp_table;
790}
791EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
792
793static void _opp_table_kref_release(struct kref *kref)
794{
795 struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
796 struct opp_device *opp_dev;
797
798 /* Release clk */
799 if (!IS_ERR(opp_table->clk))
800 clk_put(opp_table->clk);
801
802 opp_dev = list_first_entry(&opp_table->dev_list, struct opp_device,
803 node);
804
805 _remove_opp_dev(opp_dev, opp_table);
806
807 /* dev_list must be empty now */
808 WARN_ON(!list_empty(&opp_table->dev_list));
809
810 mutex_destroy(&opp_table->lock);
811 list_del(&opp_table->node);
812 kfree(opp_table);
813
814 mutex_unlock(&opp_table_lock);
815}
816
817void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
818{
819 kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
820 &opp_table_lock);
821}
822EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
823
824void _opp_free(struct dev_pm_opp *opp)
825{
826 kfree(opp);
827}
828
829static void _opp_kref_release(struct kref *kref)
830{
831 struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
832 struct opp_table *opp_table = opp->opp_table;
833
834 /*
835 * Notify the changes in the availability of the operable
836 * frequency/voltage list.
837 */
838 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
839 opp_debug_remove_one(opp);
840 list_del(&opp->node);
841 kfree(opp);
842
843 mutex_unlock(&opp_table->lock);
844 dev_pm_opp_put_opp_table(opp_table);
845}
846
847static void dev_pm_opp_get(struct dev_pm_opp *opp)
848{
849 kref_get(&opp->kref);
850}
851
852void dev_pm_opp_put(struct dev_pm_opp *opp)
853{
854 kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock);
855}
856EXPORT_SYMBOL_GPL(dev_pm_opp_put);
857
858/**
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'
862 *
863 * This function removes an opp from the opp table.
864 */
865void dev_pm_opp_remove(struct device *dev, unsigned long freq)
866{
867 struct dev_pm_opp *opp;
868 struct opp_table *opp_table;
869 bool found = false;
870
871 opp_table = _find_opp_table(dev);
872 if (IS_ERR(opp_table))
873 return;
874
875 mutex_lock(&opp_table->lock);
876
877 list_for_each_entry(opp, &opp_table->opp_list, node) {
878 if (opp->rate == freq) {
879 found = true;
880 break;
881 }
882 }
883
884 mutex_unlock(&opp_table->lock);
885
886 if (found) {
887 dev_pm_opp_put(opp);
888 } else {
889 dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
890 __func__, freq);
891 }
892
893 dev_pm_opp_put_opp_table(opp_table);
894}
895EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
896
897struct dev_pm_opp *_opp_allocate(struct opp_table *table)
898{
899 struct dev_pm_opp *opp;
900 int count, supply_size;
901
902 /* Allocate space for at least one supply */
903 count = table->regulator_count ? table->regulator_count : 1;
904 supply_size = sizeof(*opp->supplies) * count;
905
906 /* allocate new OPP node and supplies structures */
907 opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL);
908 if (!opp)
909 return NULL;
910
911 /* Put the supplies at the end of the OPP structure as an empty array */
912 opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
913 INIT_LIST_HEAD(&opp->node);
914
915 return opp;
916}
917
918static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
919 struct opp_table *opp_table)
920{
921 struct regulator *reg;
922 int i;
923
924 for (i = 0; i < opp_table->regulator_count; i++) {
925 reg = opp_table->regulators[i];
926
927 if (!regulator_is_supported_voltage(reg,
928 opp->supplies[i].u_volt_min,
929 opp->supplies[i].u_volt_max)) {
930 pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",
931 __func__, opp->supplies[i].u_volt_min,
932 opp->supplies[i].u_volt_max);
933 return false;
934 }
935 }
936
937 return true;
938}
939
940/*
941 * Returns:
942 * 0: On success. And appropriate error message for duplicate OPPs.
943 * -EBUSY: For OPP with same freq/volt and is available. The callers of
944 * _opp_add() must return 0 if they receive -EBUSY from it. This is to make
945 * sure we don't print error messages unnecessarily if different parts of
946 * kernel try to initialize the OPP table.
947 * -EEXIST: For OPP with same freq but different volt or is unavailable. This
948 * should be considered an error by the callers of _opp_add().
949 */
950int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
951 struct opp_table *opp_table)
952{
953 struct dev_pm_opp *opp;
954 struct list_head *head;
955 int ret;
956
957 /*
958 * Insert new OPP in order of increasing frequency and discard if
959 * already present.
960 *
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
963 * loop.
964 */
965 mutex_lock(&opp_table->lock);
966 head = &opp_table->opp_list;
967
968 list_for_each_entry(opp, &opp_table->opp_list, node) {
969 if (new_opp->rate > opp->rate) {
970 head = &opp->node;
971 continue;
972 }
973
974 if (new_opp->rate < opp->rate)
975 break;
976
977 /* Duplicate OPPs */
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);
982
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;
986
987 mutex_unlock(&opp_table->lock);
988 return ret;
989 }
990
991 list_add(&new_opp->node, head);
992 mutex_unlock(&opp_table->lock);
993
994 new_opp->opp_table = opp_table;
995 kref_init(&new_opp->kref);
996
997 /* Get a reference to the OPP table */
998 _get_opp_table_kref(opp_table);
999
1000 ret = opp_debug_create_one(new_opp, opp_table);
1001 if (ret)
1002 dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n",
1003 __func__, ret);
1004
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);
1009 }
1010
1011 return 0;
1012}
1013
1014/**
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.
1021 *
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.
1025 *
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.
1028 *
1029 * Return:
1030 * 0 On success OR
1031 * Duplicate OPPs (both freq and volt are same) and opp->available
1032 * -EEXIST Freq are same and volt are different OR
1033 * Duplicate OPPs (both freq and volt are same) and !opp->available
1034 * -ENOMEM Memory allocation failure
1035 */
1036int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
1037 unsigned long freq, long u_volt, bool dynamic)
1038{
1039 struct dev_pm_opp *new_opp;
1040 unsigned long tol;
1041 int ret;
1042
1043 new_opp = _opp_allocate(opp_table);
1044 if (!new_opp)
1045 return -ENOMEM;
1046
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;
1055
1056 ret = _opp_add(dev, new_opp, opp_table);
1057 if (ret) {
1058 /* Don't return error for duplicate OPPs */
1059 if (ret == -EBUSY)
1060 ret = 0;
1061 goto free_opp;
1062 }
1063
1064 /*
1065 * Notify the changes in the availability of the operable
1066 * frequency/voltage list.
1067 */
1068 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
1069 return 0;
1070
1071free_opp:
1072 _opp_free(new_opp);
1073
1074 return ret;
1075}
1076
1077/**
1078 * dev_pm_opp_set_supported_hw() - Set supported platforms
1079 * @dev: Device for which supported-hw has to be set.
1080 * @versions: Array of hierarchy of versions to match.
1081 * @count: Number of elements in the array.
1082 *
1083 * This is required only for the V2 bindings, and it enables a platform to
1084 * specify the hierarchy of versions it supports. OPP layer will then enable
1085 * OPPs, which are available for those versions, based on its 'opp-supported-hw'
1086 * property.
1087 */
1088struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
1089 const u32 *versions, unsigned int count)
1090{
1091 struct opp_table *opp_table;
1092 int ret;
1093
1094 opp_table = dev_pm_opp_get_opp_table(dev);
1095 if (!opp_table)
1096 return ERR_PTR(-ENOMEM);
1097
1098 /* Make sure there are no concurrent readers while updating opp_table */
1099 WARN_ON(!list_empty(&opp_table->opp_list));
1100
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",
1104 __func__);
1105 ret = -EBUSY;
1106 goto err;
1107 }
1108
1109 opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
1110 GFP_KERNEL);
1111 if (!opp_table->supported_hw) {
1112 ret = -ENOMEM;
1113 goto err;
1114 }
1115
1116 opp_table->supported_hw_count = count;
1117
1118 return opp_table;
1119
1120err:
1121 dev_pm_opp_put_opp_table(opp_table);
1122
1123 return ERR_PTR(ret);
1124}
1125EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
1126
1127/**
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().
1130 *
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.
1134 */
1135void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
1136{
1137 /* Make sure there are no concurrent readers while updating opp_table */
1138 WARN_ON(!list_empty(&opp_table->opp_list));
1139
1140 if (!opp_table->supported_hw) {
1141 pr_err("%s: Doesn't have supported hardware list\n",
1142 __func__);
1143 return;
1144 }
1145
1146 kfree(opp_table->supported_hw);
1147 opp_table->supported_hw = NULL;
1148 opp_table->supported_hw_count = 0;
1149
1150 dev_pm_opp_put_opp_table(opp_table);
1151}
1152EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
1153
1154/**
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.
1158 *
1159 * This is required only for the V2 bindings, and it enables a platform to
1160 * specify the extn to be used for certain property names. The properties to
1161 * which the extension will apply are opp-microvolt and opp-microamp. OPP core
1162 * should postfix the property name with -<name> while looking for them.
1163 */
1164struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
1165{
1166 struct opp_table *opp_table;
1167 int ret;
1168
1169 opp_table = dev_pm_opp_get_opp_table(dev);
1170 if (!opp_table)
1171 return ERR_PTR(-ENOMEM);
1172
1173 /* Make sure there are no concurrent readers while updating opp_table */
1174 WARN_ON(!list_empty(&opp_table->opp_list));
1175
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);
1180 ret = -EBUSY;
1181 goto err;
1182 }
1183
1184 opp_table->prop_name = kstrdup(name, GFP_KERNEL);
1185 if (!opp_table->prop_name) {
1186 ret = -ENOMEM;
1187 goto err;
1188 }
1189
1190 return opp_table;
1191
1192err:
1193 dev_pm_opp_put_opp_table(opp_table);
1194
1195 return ERR_PTR(ret);
1196}
1197EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
1198
1199/**
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().
1202 *
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.
1206 */
1207void dev_pm_opp_put_prop_name(struct opp_table *opp_table)
1208{
1209 /* Make sure there are no concurrent readers while updating opp_table */
1210 WARN_ON(!list_empty(&opp_table->opp_list));
1211
1212 if (!opp_table->prop_name) {
1213 pr_err("%s: Doesn't have a prop-name\n", __func__);
1214 return;
1215 }
1216
1217 kfree(opp_table->prop_name);
1218 opp_table->prop_name = NULL;
1219
1220 dev_pm_opp_put_opp_table(opp_table);
1221}
1222EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
1223
1224static int _allocate_set_opp_data(struct opp_table *opp_table)
1225{
1226 struct dev_pm_set_opp_data *data;
1227 int len, count = opp_table->regulator_count;
1228
1229 if (WARN_ON(!count))
1230 return -EINVAL;
1231
1232 /* space for set_opp_data */
1233 len = sizeof(*data);
1234
1235 /* space for old_opp.supplies and new_opp.supplies */
1236 len += 2 * sizeof(struct dev_pm_opp_supply) * count;
1237
1238 data = kzalloc(len, GFP_KERNEL);
1239 if (!data)
1240 return -ENOMEM;
1241
1242 data->old_opp.supplies = (void *)(data + 1);
1243 data->new_opp.supplies = data->old_opp.supplies + count;
1244
1245 opp_table->set_opp_data = data;
1246
1247 return 0;
1248}
1249
1250static void _free_set_opp_data(struct opp_table *opp_table)
1251{
1252 kfree(opp_table->set_opp_data);
1253 opp_table->set_opp_data = NULL;
1254}
1255
1256/**
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.
1261 *
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
1264 * well.
1265 *
1266 * This must be called before any OPPs are initialized for the device.
1267 */
1268struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
1269 const char * const names[],
1270 unsigned int count)
1271{
1272 struct opp_table *opp_table;
1273 struct regulator *reg;
1274 int ret, i;
1275
1276 opp_table = dev_pm_opp_get_opp_table(dev);
1277 if (!opp_table)
1278 return ERR_PTR(-ENOMEM);
1279
1280 /* This should be called before OPPs are initialized */
1281 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1282 ret = -EBUSY;
1283 goto err;
1284 }
1285
1286 /* Already have regulators set */
1287 if (opp_table->regulators) {
1288 ret = -EBUSY;
1289 goto err;
1290 }
1291
1292 opp_table->regulators = kmalloc_array(count,
1293 sizeof(*opp_table->regulators),
1294 GFP_KERNEL);
1295 if (!opp_table->regulators) {
1296 ret = -ENOMEM;
1297 goto err;
1298 }
1299
1300 for (i = 0; i < count; i++) {
1301 reg = regulator_get_optional(dev, names[i]);
1302 if (IS_ERR(reg)) {
1303 ret = PTR_ERR(reg);
1304 if (ret != -EPROBE_DEFER)
1305 dev_err(dev, "%s: no regulator (%s) found: %d\n",
1306 __func__, names[i], ret);
1307 goto free_regulators;
1308 }
1309
1310 opp_table->regulators[i] = reg;
1311 }
1312
1313 opp_table->regulator_count = count;
1314
1315 /* Allocate block only once to pass to set_opp() routines */
1316 ret = _allocate_set_opp_data(opp_table);
1317 if (ret)
1318 goto free_regulators;
1319
1320 return opp_table;
1321
1322free_regulators:
1323 while (i != 0)
1324 regulator_put(opp_table->regulators[--i]);
1325
1326 kfree(opp_table->regulators);
1327 opp_table->regulators = NULL;
1328 opp_table->regulator_count = 0;
1329err:
1330 dev_pm_opp_put_opp_table(opp_table);
1331
1332 return ERR_PTR(ret);
1333}
1334EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);
1335
1336/**
1337 * dev_pm_opp_put_regulators() - Releases resources blocked for regulator
1338 * @opp_table: OPP table returned from dev_pm_opp_set_regulators().
1339 */
1340void dev_pm_opp_put_regulators(struct opp_table *opp_table)
1341{
1342 int i;
1343
1344 if (!opp_table->regulators) {
1345 pr_err("%s: Doesn't have regulators set\n", __func__);
1346 return;
1347 }
1348
1349 /* Make sure there are no concurrent readers while updating opp_table */
1350 WARN_ON(!list_empty(&opp_table->opp_list));
1351
1352 for (i = opp_table->regulator_count - 1; i >= 0; i--)
1353 regulator_put(opp_table->regulators[i]);
1354
1355 _free_set_opp_data(opp_table);
1356
1357 kfree(opp_table->regulators);
1358 opp_table->regulators = NULL;
1359 opp_table->regulator_count = 0;
1360
1361 dev_pm_opp_put_opp_table(opp_table);
1362}
1363EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);
1364
1365/**
1366 * dev_pm_opp_set_clkname() - Set clk name for the device
1367 * @dev: Device for which clk name is being set.
1368 * @name: Clk name.
1369 *
1370 * In order to support OPP switching, OPP layer needs to get pointer to the
1371 * clock for the device. Simple cases work fine without using this routine (i.e.
1372 * by passing connection-id as NULL), but for a device with multiple clocks
1373 * available, the OPP core needs to know the exact name of the clk to use.
1374 *
1375 * This must be called before any OPPs are initialized for the device.
1376 */
1377struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
1378{
1379 struct opp_table *opp_table;
1380 int ret;
1381
1382 opp_table = dev_pm_opp_get_opp_table(dev);
1383 if (!opp_table)
1384 return ERR_PTR(-ENOMEM);
1385
1386 /* This should be called before OPPs are initialized */
1387 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1388 ret = -EBUSY;
1389 goto err;
1390 }
1391
1392 /* Already have default clk set, free it */
1393 if (!IS_ERR(opp_table->clk))
1394 clk_put(opp_table->clk);
1395
1396 /* Find clk for the device */
1397 opp_table->clk = clk_get(dev, name);
1398 if (IS_ERR(opp_table->clk)) {
1399 ret = PTR_ERR(opp_table->clk);
1400 if (ret != -EPROBE_DEFER) {
1401 dev_err(dev, "%s: Couldn't find clock: %d\n", __func__,
1402 ret);
1403 }
1404 goto err;
1405 }
1406
1407 return opp_table;
1408
1409err:
1410 dev_pm_opp_put_opp_table(opp_table);
1411
1412 return ERR_PTR(ret);
1413}
1414EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);
1415
1416/**
1417 * dev_pm_opp_put_clkname() - Releases resources blocked for clk.
1418 * @opp_table: OPP table returned from dev_pm_opp_set_clkname().
1419 */
1420void dev_pm_opp_put_clkname(struct opp_table *opp_table)
1421{
1422 /* Make sure there are no concurrent readers while updating opp_table */
1423 WARN_ON(!list_empty(&opp_table->opp_list));
1424
1425 clk_put(opp_table->clk);
1426 opp_table->clk = ERR_PTR(-EINVAL);
1427
1428 dev_pm_opp_put_opp_table(opp_table);
1429}
1430EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
1431
1432/**
1433 * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
1434 * @dev: Device for which the helper is getting registered.
1435 * @set_opp: Custom set OPP helper.
1436 *
1437 * This is useful to support complex platforms (like platforms with multiple
1438 * regulators per device), instead of the generic OPP set rate helper.
1439 *
1440 * This must be called before any OPPs are initialized for the device.
1441 */
1442struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
1443 int (*set_opp)(struct dev_pm_set_opp_data *data))
1444{
1445 struct opp_table *opp_table;
1446 int ret;
1447
1448 if (!set_opp)
1449 return ERR_PTR(-EINVAL);
1450
1451 opp_table = dev_pm_opp_get_opp_table(dev);
1452 if (!opp_table)
1453 return ERR_PTR(-ENOMEM);
1454
1455 /* This should be called before OPPs are initialized */
1456 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1457 ret = -EBUSY;
1458 goto err;
1459 }
1460
1461 /* Already have custom set_opp helper */
1462 if (WARN_ON(opp_table->set_opp)) {
1463 ret = -EBUSY;
1464 goto err;
1465 }
1466
1467 opp_table->set_opp = set_opp;
1468
1469 return opp_table;
1470
1471err:
1472 dev_pm_opp_put_opp_table(opp_table);
1473
1474 return ERR_PTR(ret);
1475}
1476EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper);
1477
1478/**
1479 * dev_pm_opp_register_put_opp_helper() - Releases resources blocked for
1480 * set_opp helper
1481 * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper().
1482 *
1483 * Release resources blocked for platform specific set_opp helper.
1484 */
1485void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table)
1486{
1487 if (!opp_table->set_opp) {
1488 pr_err("%s: Doesn't have custom set_opp helper set\n",
1489 __func__);
1490 return;
1491 }
1492
1493 /* Make sure there are no concurrent readers while updating opp_table */
1494 WARN_ON(!list_empty(&opp_table->opp_list));
1495
1496 opp_table->set_opp = NULL;
1497
1498 dev_pm_opp_put_opp_table(opp_table);
1499}
1500EXPORT_SYMBOL_GPL(dev_pm_opp_register_put_opp_helper);
1501
1502/**
1503 * dev_pm_opp_add() - Add an OPP table from a table definitions
1504 * @dev: device for which we do this operation
1505 * @freq: Frequency in Hz for this OPP
1506 * @u_volt: Voltage in uVolts for this OPP
1507 *
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.
1511 *
1512 * Return:
1513 * 0 On success OR
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
1518 */
1519int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
1520{
1521 struct opp_table *opp_table;
1522 int ret;
1523
1524 opp_table = dev_pm_opp_get_opp_table(dev);
1525 if (!opp_table)
1526 return -ENOMEM;
1527
1528 ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
1529
1530 dev_pm_opp_put_opp_table(opp_table);
1531 return ret;
1532}
1533EXPORT_SYMBOL_GPL(dev_pm_opp_add);
1534
1535/**
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
1540 *
1541 * Set the availability of an OPP, opp_{enable,disable} share a common logic
1542 * which is isolated here.
1543 *
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
1546 * successful.
1547 */
1548static int _opp_set_availability(struct device *dev, unsigned long freq,
1549 bool availability_req)
1550{
1551 struct opp_table *opp_table;
1552 struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
1553 int r = 0;
1554
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);
1560 return r;
1561 }
1562
1563 mutex_lock(&opp_table->lock);
1564
1565 /* Do we have the frequency? */
1566 list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
1567 if (tmp_opp->rate == freq) {
1568 opp = tmp_opp;
1569 break;
1570 }
1571 }
1572
1573 if (IS_ERR(opp)) {
1574 r = PTR_ERR(opp);
1575 goto unlock;
1576 }
1577
1578 /* Is update really needed? */
1579 if (opp->available == availability_req)
1580 goto unlock;
1581
1582 opp->available = availability_req;
1583
1584 dev_pm_opp_get(opp);
1585 mutex_unlock(&opp_table->lock);
1586
1587 /* Notify the change of the OPP availability */
1588 if (availability_req)
1589 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
1590 opp);
1591 else
1592 blocking_notifier_call_chain(&opp_table->head,
1593 OPP_EVENT_DISABLE, opp);
1594
1595 dev_pm_opp_put(opp);
1596 goto put_table;
1597
1598unlock:
1599 mutex_unlock(&opp_table->lock);
1600put_table:
1601 dev_pm_opp_put_opp_table(opp_table);
1602 return r;
1603}
1604
1605/**
1606 * dev_pm_opp_enable() - Enable a specific OPP
1607 * @dev: device for which we do this operation
1608 * @freq: OPP frequency to enable
1609 *
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.
1613 *
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
1616 * successful.
1617 */
1618int dev_pm_opp_enable(struct device *dev, unsigned long freq)
1619{
1620 return _opp_set_availability(dev, freq, true);
1621}
1622EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
1623
1624/**
1625 * dev_pm_opp_disable() - Disable a specific OPP
1626 * @dev: device for which we do this operation
1627 * @freq: OPP frequency to disable
1628 *
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).
1633 *
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
1636 * successful.
1637 */
1638int dev_pm_opp_disable(struct device *dev, unsigned long freq)
1639{
1640 return _opp_set_availability(dev, freq, false);
1641}
1642EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
1643
1644/**
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
1648 *
1649 * Return: 0 on success or a negative error value.
1650 */
1651int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
1652{
1653 struct opp_table *opp_table;
1654 int ret;
1655
1656 opp_table = _find_opp_table(dev);
1657 if (IS_ERR(opp_table))
1658 return PTR_ERR(opp_table);
1659
1660 ret = blocking_notifier_chain_register(&opp_table->head, nb);
1661
1662 dev_pm_opp_put_opp_table(opp_table);
1663
1664 return ret;
1665}
1666EXPORT_SYMBOL(dev_pm_opp_register_notifier);
1667
1668/**
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
1672 *
1673 * Return: 0 on success or a negative error value.
1674 */
1675int dev_pm_opp_unregister_notifier(struct device *dev,
1676 struct notifier_block *nb)
1677{
1678 struct opp_table *opp_table;
1679 int ret;
1680
1681 opp_table = _find_opp_table(dev);
1682 if (IS_ERR(opp_table))
1683 return PTR_ERR(opp_table);
1684
1685 ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
1686
1687 dev_pm_opp_put_opp_table(opp_table);
1688
1689 return ret;
1690}
1691EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
1692
1693/*
1694 * Free OPPs either created using static entries present in DT or even the
1695 * dynamically added entries based on remove_all param.
1696 */
1697void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev,
1698 bool remove_all)
1699{
1700 struct dev_pm_opp *opp, *tmp;
1701
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);
1708 }
1709 } else {
1710 _remove_opp_dev(_find_opp_dev(dev, opp_table), opp_table);
1711 }
1712}
1713
1714void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all)
1715{
1716 struct opp_table *opp_table;
1717
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);
1722
1723 if (error != -ENODEV)
1724 WARN(1, "%s: opp_table: %d\n",
1725 IS_ERR_OR_NULL(dev) ?
1726 "Invalid device" : dev_name(dev),
1727 error);
1728 return;
1729 }
1730
1731 _dev_pm_opp_remove_table(opp_table, dev, remove_all);
1732
1733 dev_pm_opp_put_opp_table(opp_table);
1734}
1735
1736/**
1737 * dev_pm_opp_remove_table() - Free all OPPs associated with the device
1738 * @dev: device pointer used to lookup OPP table.
1739 *
1740 * Free both OPPs created using static entries present in DT and the
1741 * dynamically added entries.
1742 */
1743void dev_pm_opp_remove_table(struct device *dev)
1744{
1745 _dev_pm_opp_find_and_remove_table(dev, true);
1746}
1747EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
diff --git a/drivers/opp/cpu.c b/drivers/opp/cpu.c
new file mode 100644
index 000000000000..2d87bc1adf38
--- /dev/null
+++ b/drivers/opp/cpu.c
@@ -0,0 +1,236 @@
1/*
2 * Generic OPP helper interface for CPU device
3 *
4 * Copyright (C) 2009-2014 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
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/cpu.h>
17#include <linux/cpufreq.h>
18#include <linux/err.h>
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/slab.h>
22
23#include "opp.h"
24
25#ifdef CONFIG_CPU_FREQ
26
27/**
28 * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
29 * @dev: device for which we do this operation
30 * @table: Cpufreq table returned back to caller
31 *
32 * Generate a cpufreq table for a provided device- this assumes that the
33 * opp table is already initialized and ready for usage.
34 *
35 * This function allocates required memory for the cpufreq table. It is
36 * expected that the caller does the required maintenance such as freeing
37 * the table as required.
38 *
39 * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
40 * if no memory available for the operation (table is not populated), returns 0
41 * if successful and table is populated.
42 *
43 * WARNING: It is important for the callers to ensure refreshing their copy of
44 * the table if any of the mentioned functions have been invoked in the interim.
45 */
46int dev_pm_opp_init_cpufreq_table(struct device *dev,
47 struct cpufreq_frequency_table **table)
48{
49 struct dev_pm_opp *opp;
50 struct cpufreq_frequency_table *freq_table = NULL;
51 int i, max_opps, ret = 0;
52 unsigned long rate;
53
54 max_opps = dev_pm_opp_get_opp_count(dev);
55 if (max_opps <= 0)
56 return max_opps ? max_opps : -ENODATA;
57
58 freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_ATOMIC);
59 if (!freq_table)
60 return -ENOMEM;
61
62 for (i = 0, rate = 0; i < max_opps; i++, rate++) {
63 /* find next rate */
64 opp = dev_pm_opp_find_freq_ceil(dev, &rate);
65 if (IS_ERR(opp)) {
66 ret = PTR_ERR(opp);
67 goto out;
68 }
69 freq_table[i].driver_data = i;
70 freq_table[i].frequency = rate / 1000;
71
72 /* Is Boost/turbo opp ? */
73 if (dev_pm_opp_is_turbo(opp))
74 freq_table[i].flags = CPUFREQ_BOOST_FREQ;
75
76 dev_pm_opp_put(opp);
77 }
78
79 freq_table[i].driver_data = i;
80 freq_table[i].frequency = CPUFREQ_TABLE_END;
81
82 *table = &freq_table[0];
83
84out:
85 if (ret)
86 kfree(freq_table);
87
88 return ret;
89}
90EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table);
91
92/**
93 * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
94 * @dev: device for which we do this operation
95 * @table: table to free
96 *
97 * Free up the table allocated by dev_pm_opp_init_cpufreq_table
98 */
99void dev_pm_opp_free_cpufreq_table(struct device *dev,
100 struct cpufreq_frequency_table **table)
101{
102 if (!table)
103 return;
104
105 kfree(*table);
106 *table = NULL;
107}
108EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
109#endif /* CONFIG_CPU_FREQ */
110
111void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of)
112{
113 struct device *cpu_dev;
114 int cpu;
115
116 WARN_ON(cpumask_empty(cpumask));
117
118 for_each_cpu(cpu, cpumask) {
119 cpu_dev = get_cpu_device(cpu);
120 if (!cpu_dev) {
121 pr_err("%s: failed to get cpu%d device\n", __func__,
122 cpu);
123 continue;
124 }
125
126 if (of)
127 dev_pm_opp_of_remove_table(cpu_dev);
128 else
129 dev_pm_opp_remove_table(cpu_dev);
130 }
131}
132
133/**
134 * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
135 * @cpumask: cpumask for which OPP table needs to be removed
136 *
137 * This removes the OPP tables for CPUs present in the @cpumask.
138 * This should be used to remove all the OPPs entries associated with
139 * the cpus in @cpumask.
140 */
141void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
142{
143 _dev_pm_opp_cpumask_remove_table(cpumask, false);
144}
145EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
146
147/**
148 * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
149 * @cpu_dev: CPU device for which we do this operation
150 * @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev
151 *
152 * This marks OPP table of the @cpu_dev as shared by the CPUs present in
153 * @cpumask.
154 *
155 * Returns -ENODEV if OPP table isn't already present.
156 */
157int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
158 const struct cpumask *cpumask)
159{
160 struct opp_device *opp_dev;
161 struct opp_table *opp_table;
162 struct device *dev;
163 int cpu, ret = 0;
164
165 opp_table = _find_opp_table(cpu_dev);
166 if (IS_ERR(opp_table))
167 return PTR_ERR(opp_table);
168
169 for_each_cpu(cpu, cpumask) {
170 if (cpu == cpu_dev->id)
171 continue;
172
173 dev = get_cpu_device(cpu);
174 if (!dev) {
175 dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
176 __func__, cpu);
177 continue;
178 }
179
180 opp_dev = _add_opp_dev(dev, opp_table);
181 if (!opp_dev) {
182 dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",
183 __func__, cpu);
184 continue;
185 }
186
187 /* Mark opp-table as multiple CPUs are sharing it now */
188 opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
189 }
190
191 dev_pm_opp_put_opp_table(opp_table);
192
193 return ret;
194}
195EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
196
197/**
198 * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
199 * @cpu_dev: CPU device for which we do this operation
200 * @cpumask: cpumask to update with information of sharing CPUs
201 *
202 * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
203 *
204 * Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
205 * table's status is access-unknown.
206 */
207int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
208{
209 struct opp_device *opp_dev;
210 struct opp_table *opp_table;
211 int ret = 0;
212
213 opp_table = _find_opp_table(cpu_dev);
214 if (IS_ERR(opp_table))
215 return PTR_ERR(opp_table);
216
217 if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {
218 ret = -EINVAL;
219 goto put_opp_table;
220 }
221
222 cpumask_clear(cpumask);
223
224 if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
225 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
226 cpumask_set_cpu(opp_dev->dev->id, cpumask);
227 } else {
228 cpumask_set_cpu(cpu_dev->id, cpumask);
229 }
230
231put_opp_table:
232 dev_pm_opp_put_opp_table(opp_table);
233
234 return ret;
235}
236EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);
diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
new file mode 100644
index 000000000000..81cf120fcf43
--- /dev/null
+++ b/drivers/opp/debugfs.c
@@ -0,0 +1,249 @@
1/*
2 * Generic OPP debugfs interface
3 *
4 * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/debugfs.h>
14#include <linux/device.h>
15#include <linux/err.h>
16#include <linux/init.h>
17#include <linux/limits.h>
18#include <linux/slab.h>
19
20#include "opp.h"
21
22static struct dentry *rootdir;
23
24static void opp_set_dev_name(const struct device *dev, char *name)
25{
26 if (dev->parent)
27 snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
28 dev_name(dev));
29 else
30 snprintf(name, NAME_MAX, "%s", dev_name(dev));
31}
32
33void opp_debug_remove_one(struct dev_pm_opp *opp)
34{
35 debugfs_remove_recursive(opp->dentry);
36}
37
38static bool opp_debug_create_supplies(struct dev_pm_opp *opp,
39 struct opp_table *opp_table,
40 struct dentry *pdentry)
41{
42 struct dentry *d;
43 int i;
44 char *name;
45
46 for (i = 0; i < opp_table->regulator_count; i++) {
47 name = kasprintf(GFP_KERNEL, "supply-%d", i);
48
49 /* Create per-opp directory */
50 d = debugfs_create_dir(name, pdentry);
51
52 kfree(name);
53
54 if (!d)
55 return false;
56
57 if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d,
58 &opp->supplies[i].u_volt))
59 return false;
60
61 if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d,
62 &opp->supplies[i].u_volt_min))
63 return false;
64
65 if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d,
66 &opp->supplies[i].u_volt_max))
67 return false;
68
69 if (!debugfs_create_ulong("u_amp", S_IRUGO, d,
70 &opp->supplies[i].u_amp))
71 return false;
72 }
73
74 return true;
75}
76
77int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
78{
79 struct dentry *pdentry = opp_table->dentry;
80 struct dentry *d;
81 char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
82
83 /* Rate is unique to each OPP, use it to give opp-name */
84 snprintf(name, sizeof(name), "opp:%lu", opp->rate);
85
86 /* Create per-opp directory */
87 d = debugfs_create_dir(name, pdentry);
88 if (!d)
89 return -ENOMEM;
90
91 if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available))
92 return -ENOMEM;
93
94 if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic))
95 return -ENOMEM;
96
97 if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo))
98 return -ENOMEM;
99
100 if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend))
101 return -ENOMEM;
102
103 if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))
104 return -ENOMEM;
105
106 if (!opp_debug_create_supplies(opp, opp_table, d))
107 return -ENOMEM;
108
109 if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
110 &opp->clock_latency_ns))
111 return -ENOMEM;
112
113 opp->dentry = d;
114 return 0;
115}
116
117static int opp_list_debug_create_dir(struct opp_device *opp_dev,
118 struct opp_table *opp_table)
119{
120 const struct device *dev = opp_dev->dev;
121 struct dentry *d;
122
123 opp_set_dev_name(dev, opp_table->dentry_name);
124
125 /* Create device specific directory */
126 d = debugfs_create_dir(opp_table->dentry_name, rootdir);
127 if (!d) {
128 dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
129 return -ENOMEM;
130 }
131
132 opp_dev->dentry = d;
133 opp_table->dentry = d;
134
135 return 0;
136}
137
138static int opp_list_debug_create_link(struct opp_device *opp_dev,
139 struct opp_table *opp_table)
140{
141 const struct device *dev = opp_dev->dev;
142 char name[NAME_MAX];
143 struct dentry *d;
144
145 opp_set_dev_name(opp_dev->dev, name);
146
147 /* Create device specific directory link */
148 d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name);
149 if (!d) {
150 dev_err(dev, "%s: Failed to create link\n", __func__);
151 return -ENOMEM;
152 }
153
154 opp_dev->dentry = d;
155
156 return 0;
157}
158
159/**
160 * opp_debug_register - add a device opp node to the debugfs 'opp' directory
161 * @opp_dev: opp-dev pointer for device
162 * @opp_table: the device-opp being added
163 *
164 * Dynamically adds device specific directory in debugfs 'opp' directory. If the
165 * device-opp is shared with other devices, then links will be created for all
166 * devices except the first.
167 *
168 * Return: 0 on success, otherwise negative error.
169 */
170int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
171{
172 if (!rootdir) {
173 pr_debug("%s: Uninitialized rootdir\n", __func__);
174 return -EINVAL;
175 }
176
177 if (opp_table->dentry)
178 return opp_list_debug_create_link(opp_dev, opp_table);
179
180 return opp_list_debug_create_dir(opp_dev, opp_table);
181}
182
183static void opp_migrate_dentry(struct opp_device *opp_dev,
184 struct opp_table *opp_table)
185{
186 struct opp_device *new_dev;
187 const struct device *dev;
188 struct dentry *dentry;
189
190 /* Look for next opp-dev */
191 list_for_each_entry(new_dev, &opp_table->dev_list, node)
192 if (new_dev != opp_dev)
193 break;
194
195 /* new_dev is guaranteed to be valid here */
196 dev = new_dev->dev;
197 debugfs_remove_recursive(new_dev->dentry);
198
199 opp_set_dev_name(dev, opp_table->dentry_name);
200
201 dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
202 opp_table->dentry_name);
203 if (!dentry) {
204 dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
205 __func__, dev_name(opp_dev->dev), dev_name(dev));
206 return;
207 }
208
209 new_dev->dentry = dentry;
210 opp_table->dentry = dentry;
211}
212
213/**
214 * opp_debug_unregister - remove a device opp node from debugfs opp directory
215 * @opp_dev: opp-dev pointer for device
216 * @opp_table: the device-opp being removed
217 *
218 * Dynamically removes device specific directory from debugfs 'opp' directory.
219 */
220void opp_debug_unregister(struct opp_device *opp_dev,
221 struct opp_table *opp_table)
222{
223 if (opp_dev->dentry == opp_table->dentry) {
224 /* Move the real dentry object under another device */
225 if (!list_is_singular(&opp_table->dev_list)) {
226 opp_migrate_dentry(opp_dev, opp_table);
227 goto out;
228 }
229 opp_table->dentry = NULL;
230 }
231
232 debugfs_remove_recursive(opp_dev->dentry);
233
234out:
235 opp_dev->dentry = NULL;
236}
237
238static int __init opp_debug_init(void)
239{
240 /* Create /sys/kernel/debug/opp directory */
241 rootdir = debugfs_create_dir("opp", NULL);
242 if (!rootdir) {
243 pr_err("%s: Failed to create root directory\n", __func__);
244 return -ENOMEM;
245 }
246
247 return 0;
248}
249core_initcall(opp_debug_init);
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
new file mode 100644
index 000000000000..0b718886479b
--- /dev/null
+++ b/drivers/opp/of.c
@@ -0,0 +1,633 @@
1/*
2 * Generic OPP OF helpers
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
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/cpu.h>
17#include <linux/errno.h>
18#include <linux/device.h>
19#include <linux/of.h>
20#include <linux/slab.h>
21#include <linux/export.h>
22
23#include "opp.h"
24
25static struct opp_table *_managed_opp(const struct device_node *np)
26{
27 struct opp_table *opp_table, *managed_table = NULL;
28
29 mutex_lock(&opp_table_lock);
30
31 list_for_each_entry(opp_table, &opp_tables, node) {
32 if (opp_table->np == np) {
33 /*
34 * Multiple devices can point to the same OPP table and
35 * so will have same node-pointer, np.
36 *
37 * But the OPPs will be considered as shared only if the
38 * OPP table contains a "opp-shared" property.
39 */
40 if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
41 _get_opp_table_kref(opp_table);
42 managed_table = opp_table;
43 }
44
45 break;
46 }
47 }
48
49 mutex_unlock(&opp_table_lock);
50
51 return managed_table;
52}
53
54void _of_init_opp_table(struct opp_table *opp_table, struct device *dev)
55{
56 struct device_node *np;
57
58 /*
59 * Only required for backward compatibility with v1 bindings, but isn't
60 * harmful for other cases. And so we do it unconditionally.
61 */
62 np = of_node_get(dev->of_node);
63 if (np) {
64 u32 val;
65
66 if (!of_property_read_u32(np, "clock-latency", &val))
67 opp_table->clock_latency_ns_max = val;
68 of_property_read_u32(np, "voltage-tolerance",
69 &opp_table->voltage_tolerance_v1);
70 of_node_put(np);
71 }
72}
73
74static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
75 struct device_node *np)
76{
77 unsigned int count = opp_table->supported_hw_count;
78 u32 version;
79 int ret;
80
81 if (!opp_table->supported_hw) {
82 /*
83 * In the case that no supported_hw has been set by the
84 * platform but there is an opp-supported-hw value set for
85 * an OPP then the OPP should not be enabled as there is
86 * no way to see if the hardware supports it.
87 */
88 if (of_find_property(np, "opp-supported-hw", NULL))
89 return false;
90 else
91 return true;
92 }
93
94 while (count--) {
95 ret = of_property_read_u32_index(np, "opp-supported-hw", count,
96 &version);
97 if (ret) {
98 dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
99 __func__, count, ret);
100 return false;
101 }
102
103 /* Both of these are bitwise masks of the versions */
104 if (!(version & opp_table->supported_hw[count]))
105 return false;
106 }
107
108 return true;
109}
110
111static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
112 struct opp_table *opp_table)
113{
114 u32 *microvolt, *microamp = NULL;
115 int supplies, vcount, icount, ret, i, j;
116 struct property *prop = NULL;
117 char name[NAME_MAX];
118
119 supplies = opp_table->regulator_count ? opp_table->regulator_count : 1;
120
121 /* Search for "opp-microvolt-<name>" */
122 if (opp_table->prop_name) {
123 snprintf(name, sizeof(name), "opp-microvolt-%s",
124 opp_table->prop_name);
125 prop = of_find_property(opp->np, name, NULL);
126 }
127
128 if (!prop) {
129 /* Search for "opp-microvolt" */
130 sprintf(name, "opp-microvolt");
131 prop = of_find_property(opp->np, name, NULL);
132
133 /* Missing property isn't a problem, but an invalid entry is */
134 if (!prop) {
135 if (!opp_table->regulator_count)
136 return 0;
137
138 dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
139 __func__);
140 return -EINVAL;
141 }
142 }
143
144 vcount = of_property_count_u32_elems(opp->np, name);
145 if (vcount < 0) {
146 dev_err(dev, "%s: Invalid %s property (%d)\n",
147 __func__, name, vcount);
148 return vcount;
149 }
150
151 /* There can be one or three elements per supply */
152 if (vcount != supplies && vcount != supplies * 3) {
153 dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
154 __func__, name, vcount, supplies);
155 return -EINVAL;
156 }
157
158 microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL);
159 if (!microvolt)
160 return -ENOMEM;
161
162 ret = of_property_read_u32_array(opp->np, name, microvolt, vcount);
163 if (ret) {
164 dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
165 ret = -EINVAL;
166 goto free_microvolt;
167 }
168
169 /* Search for "opp-microamp-<name>" */
170 prop = NULL;
171 if (opp_table->prop_name) {
172 snprintf(name, sizeof(name), "opp-microamp-%s",
173 opp_table->prop_name);
174 prop = of_find_property(opp->np, name, NULL);
175 }
176
177 if (!prop) {
178 /* Search for "opp-microamp" */
179 sprintf(name, "opp-microamp");
180 prop = of_find_property(opp->np, name, NULL);
181 }
182
183 if (prop) {
184 icount = of_property_count_u32_elems(opp->np, name);
185 if (icount < 0) {
186 dev_err(dev, "%s: Invalid %s property (%d)\n", __func__,
187 name, icount);
188 ret = icount;
189 goto free_microvolt;
190 }
191
192 if (icount != supplies) {
193 dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
194 __func__, name, icount, supplies);
195 ret = -EINVAL;
196 goto free_microvolt;
197 }
198
199 microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL);
200 if (!microamp) {
201 ret = -EINVAL;
202 goto free_microvolt;
203 }
204
205 ret = of_property_read_u32_array(opp->np, name, microamp,
206 icount);
207 if (ret) {
208 dev_err(dev, "%s: error parsing %s: %d\n", __func__,
209 name, ret);
210 ret = -EINVAL;
211 goto free_microamp;
212 }
213 }
214
215 for (i = 0, j = 0; i < supplies; i++) {
216 opp->supplies[i].u_volt = microvolt[j++];
217
218 if (vcount == supplies) {
219 opp->supplies[i].u_volt_min = opp->supplies[i].u_volt;
220 opp->supplies[i].u_volt_max = opp->supplies[i].u_volt;
221 } else {
222 opp->supplies[i].u_volt_min = microvolt[j++];
223 opp->supplies[i].u_volt_max = microvolt[j++];
224 }
225
226 if (microamp)
227 opp->supplies[i].u_amp = microamp[i];
228 }
229
230free_microamp:
231 kfree(microamp);
232free_microvolt:
233 kfree(microvolt);
234
235 return ret;
236}
237
238/**
239 * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
240 * entries
241 * @dev: device pointer used to lookup OPP table.
242 *
243 * Free OPPs created using static entries present in DT.
244 */
245void dev_pm_opp_of_remove_table(struct device *dev)
246{
247 _dev_pm_opp_find_and_remove_table(dev, false);
248}
249EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
250
251/* Returns opp descriptor node for a device node, caller must
252 * do of_node_put() */
253static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np)
254{
255 /*
256 * There should be only ONE phandle present in "operating-points-v2"
257 * property.
258 */
259
260 return of_parse_phandle(np, "operating-points-v2", 0);
261}
262
263/* Returns opp descriptor node for a device, caller must do of_node_put() */
264struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
265{
266 return _opp_of_get_opp_desc_node(dev->of_node);
267}
268EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
269
270/**
271 * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
272 * @opp_table: OPP table
273 * @dev: device for which we do this operation
274 * @np: device node
275 *
276 * This function adds an opp definition to the opp table and returns status. The
277 * opp can be controlled using dev_pm_opp_enable/disable functions and may be
278 * removed by dev_pm_opp_remove.
279 *
280 * Return:
281 * 0 On success OR
282 * Duplicate OPPs (both freq and volt are same) and opp->available
283 * -EEXIST Freq are same and volt are different OR
284 * Duplicate OPPs (both freq and volt are same) and !opp->available
285 * -ENOMEM Memory allocation failure
286 * -EINVAL Failed parsing the OPP node
287 */
288static int _opp_add_static_v2(struct opp_table *opp_table, struct device *dev,
289 struct device_node *np)
290{
291 struct dev_pm_opp *new_opp;
292 u64 rate;
293 u32 val;
294 int ret;
295
296 new_opp = _opp_allocate(opp_table);
297 if (!new_opp)
298 return -ENOMEM;
299
300 ret = of_property_read_u64(np, "opp-hz", &rate);
301 if (ret < 0) {
302 dev_err(dev, "%s: opp-hz not found\n", __func__);
303 goto free_opp;
304 }
305
306 /* Check if the OPP supports hardware's hierarchy of versions or not */
307 if (!_opp_is_supported(dev, opp_table, np)) {
308 dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
309 goto free_opp;
310 }
311
312 /*
313 * Rate is defined as an unsigned long in clk API, and so casting
314 * explicitly to its type. Must be fixed once rate is 64 bit
315 * guaranteed in clk API.
316 */
317 new_opp->rate = (unsigned long)rate;
318 new_opp->turbo = of_property_read_bool(np, "turbo-mode");
319
320 new_opp->np = np;
321 new_opp->dynamic = false;
322 new_opp->available = true;
323
324 if (!of_property_read_u32(np, "clock-latency-ns", &val))
325 new_opp->clock_latency_ns = val;
326
327 ret = opp_parse_supplies(new_opp, dev, opp_table);
328 if (ret)
329 goto free_opp;
330
331 ret = _opp_add(dev, new_opp, opp_table);
332 if (ret) {
333 /* Don't return error for duplicate OPPs */
334 if (ret == -EBUSY)
335 ret = 0;
336 goto free_opp;
337 }
338
339 /* OPP to select on device suspend */
340 if (of_property_read_bool(np, "opp-suspend")) {
341 if (opp_table->suspend_opp) {
342 dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
343 __func__, opp_table->suspend_opp->rate,
344 new_opp->rate);
345 } else {
346 new_opp->suspend = true;
347 opp_table->suspend_opp = new_opp;
348 }
349 }
350
351 if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
352 opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
353
354 pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
355 __func__, new_opp->turbo, new_opp->rate,
356 new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
357 new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns);
358
359 /*
360 * Notify the changes in the availability of the operable
361 * frequency/voltage list.
362 */
363 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
364 return 0;
365
366free_opp:
367 _opp_free(new_opp);
368
369 return ret;
370}
371
372/* Initializes OPP tables based on new bindings */
373static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
374{
375 struct device_node *np;
376 struct opp_table *opp_table;
377 int ret = 0, count = 0;
378
379 opp_table = _managed_opp(opp_np);
380 if (opp_table) {
381 /* OPPs are already managed */
382 if (!_add_opp_dev(dev, opp_table))
383 ret = -ENOMEM;
384 goto put_opp_table;
385 }
386
387 opp_table = dev_pm_opp_get_opp_table(dev);
388 if (!opp_table)
389 return -ENOMEM;
390
391 /* We have opp-table node now, iterate over it and add OPPs */
392 for_each_available_child_of_node(opp_np, np) {
393 count++;
394
395 ret = _opp_add_static_v2(opp_table, dev, np);
396 if (ret) {
397 dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
398 ret);
399 _dev_pm_opp_remove_table(opp_table, dev, false);
400 goto put_opp_table;
401 }
402 }
403
404 /* There should be one of more OPP defined */
405 if (WARN_ON(!count)) {
406 ret = -ENOENT;
407 goto put_opp_table;
408 }
409
410 opp_table->np = opp_np;
411 if (of_property_read_bool(opp_np, "opp-shared"))
412 opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
413 else
414 opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
415
416put_opp_table:
417 dev_pm_opp_put_opp_table(opp_table);
418
419 return ret;
420}
421
422/* Initializes OPP tables based on old-deprecated bindings */
423static int _of_add_opp_table_v1(struct device *dev)
424{
425 struct opp_table *opp_table;
426 const struct property *prop;
427 const __be32 *val;
428 int nr, ret = 0;
429
430 prop = of_find_property(dev->of_node, "operating-points", NULL);
431 if (!prop)
432 return -ENODEV;
433 if (!prop->value)
434 return -ENODATA;
435
436 /*
437 * Each OPP is a set of tuples consisting of frequency and
438 * voltage like <freq-kHz vol-uV>.
439 */
440 nr = prop->length / sizeof(u32);
441 if (nr % 2) {
442 dev_err(dev, "%s: Invalid OPP table\n", __func__);
443 return -EINVAL;
444 }
445
446 opp_table = dev_pm_opp_get_opp_table(dev);
447 if (!opp_table)
448 return -ENOMEM;
449
450 val = prop->value;
451 while (nr) {
452 unsigned long freq = be32_to_cpup(val++) * 1000;
453 unsigned long volt = be32_to_cpup(val++);
454
455 ret = _opp_add_v1(opp_table, dev, freq, volt, false);
456 if (ret) {
457 dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
458 __func__, freq, ret);
459 _dev_pm_opp_remove_table(opp_table, dev, false);
460 break;
461 }
462 nr -= 2;
463 }
464
465 dev_pm_opp_put_opp_table(opp_table);
466 return ret;
467}
468
469/**
470 * dev_pm_opp_of_add_table() - Initialize opp table from device tree
471 * @dev: device pointer used to lookup OPP table.
472 *
473 * Register the initial OPP table with the OPP library for given device.
474 *
475 * Return:
476 * 0 On success OR
477 * Duplicate OPPs (both freq and volt are same) and opp->available
478 * -EEXIST Freq are same and volt are different OR
479 * Duplicate OPPs (both freq and volt are same) and !opp->available
480 * -ENOMEM Memory allocation failure
481 * -ENODEV when 'operating-points' property is not found or is invalid data
482 * in device node.
483 * -ENODATA when empty 'operating-points' property is found
484 * -EINVAL when invalid entries are found in opp-v2 table
485 */
486int dev_pm_opp_of_add_table(struct device *dev)
487{
488 struct device_node *opp_np;
489 int ret;
490
491 /*
492 * OPPs have two version of bindings now. The older one is deprecated,
493 * try for the new binding first.
494 */
495 opp_np = dev_pm_opp_of_get_opp_desc_node(dev);
496 if (!opp_np) {
497 /*
498 * Try old-deprecated bindings for backward compatibility with
499 * older dtbs.
500 */
501 return _of_add_opp_table_v1(dev);
502 }
503
504 ret = _of_add_opp_table_v2(dev, opp_np);
505 of_node_put(opp_np);
506
507 return ret;
508}
509EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
510
511/* CPU device specific helpers */
512
513/**
514 * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask
515 * @cpumask: cpumask for which OPP table needs to be removed
516 *
517 * This removes the OPP tables for CPUs present in the @cpumask.
518 * This should be used only to remove static entries created from DT.
519 */
520void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
521{
522 _dev_pm_opp_cpumask_remove_table(cpumask, true);
523}
524EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
525
526/**
527 * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask
528 * @cpumask: cpumask for which OPP table needs to be added.
529 *
530 * This adds the OPP tables for CPUs present in the @cpumask.
531 */
532int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
533{
534 struct device *cpu_dev;
535 int cpu, ret = 0;
536
537 WARN_ON(cpumask_empty(cpumask));
538
539 for_each_cpu(cpu, cpumask) {
540 cpu_dev = get_cpu_device(cpu);
541 if (!cpu_dev) {
542 pr_err("%s: failed to get cpu%d device\n", __func__,
543 cpu);
544 continue;
545 }
546
547 ret = dev_pm_opp_of_add_table(cpu_dev);
548 if (ret) {
549 /*
550 * OPP may get registered dynamically, don't print error
551 * message here.
552 */
553 pr_debug("%s: couldn't find opp table for cpu:%d, %d\n",
554 __func__, cpu, ret);
555
556 /* Free all other OPPs */
557 dev_pm_opp_of_cpumask_remove_table(cpumask);
558 break;
559 }
560 }
561
562 return ret;
563}
564EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
565
566/*
567 * Works only for OPP v2 bindings.
568 *
569 * Returns -ENOENT if operating-points-v2 bindings aren't supported.
570 */
571/**
572 * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with
573 * @cpu_dev using operating-points-v2
574 * bindings.
575 *
576 * @cpu_dev: CPU device for which we do this operation
577 * @cpumask: cpumask to update with information of sharing CPUs
578 *
579 * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
580 *
581 * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev.
582 */
583int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
584 struct cpumask *cpumask)
585{
586 struct device_node *np, *tmp_np, *cpu_np;
587 int cpu, ret = 0;
588
589 /* Get OPP descriptor node */
590 np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
591 if (!np) {
592 dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__);
593 return -ENOENT;
594 }
595
596 cpumask_set_cpu(cpu_dev->id, cpumask);
597
598 /* OPPs are shared ? */
599 if (!of_property_read_bool(np, "opp-shared"))
600 goto put_cpu_node;
601
602 for_each_possible_cpu(cpu) {
603 if (cpu == cpu_dev->id)
604 continue;
605
606 cpu_np = of_get_cpu_node(cpu, NULL);
607 if (!cpu_np) {
608 dev_err(cpu_dev, "%s: failed to get cpu%d node\n",
609 __func__, cpu);
610 ret = -ENOENT;
611 goto put_cpu_node;
612 }
613
614 /* Get OPP descriptor node */
615 tmp_np = _opp_of_get_opp_desc_node(cpu_np);
616 if (!tmp_np) {
617 pr_err("%pOF: Couldn't find opp node\n", cpu_np);
618 ret = -ENOENT;
619 goto put_cpu_node;
620 }
621
622 /* CPUs are sharing opp node */
623 if (np == tmp_np)
624 cpumask_set_cpu(cpu, cpumask);
625
626 of_node_put(tmp_np);
627 }
628
629put_cpu_node:
630 of_node_put(np);
631 return ret;
632}
633EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
new file mode 100644
index 000000000000..166eef990599
--- /dev/null
+++ b/drivers/opp/opp.h
@@ -0,0 +1,222 @@
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
14#ifndef __DRIVER_OPP_H__
15#define __DRIVER_OPP_H__
16
17#include <linux/device.h>
18#include <linux/kernel.h>
19#include <linux/kref.h>
20#include <linux/list.h>
21#include <linux/limits.h>
22#include <linux/pm_opp.h>
23#include <linux/notifier.h>
24
25struct clk;
26struct regulator;
27
28/* Lock to allow exclusive modification to the device and opp lists */
29extern struct mutex opp_table_lock;
30
31extern struct list_head opp_tables;
32
33/*
34 * Internal data structure organization with the OPP layer library is as
35 * follows:
36 * opp_tables (root)
37 * |- device 1 (represents voltage domain 1)
38 * | |- opp 1 (availability, freq, voltage)
39 * | |- opp 2 ..
40 * ... ...
41 * | `- opp n ..
42 * |- device 2 (represents the next voltage domain)
43 * ...
44 * `- device m (represents mth voltage domain)
45 * device 1, 2.. are represented by opp_table structure while each opp
46 * is represented by the opp structure.
47 */
48
49/**
50 * struct dev_pm_opp - Generic OPP description structure
51 * @node: opp table node. The nodes are maintained throughout the lifetime
52 * of boot. It is expected only an optimal set of OPPs are
53 * added to the library by the SoC framework.
54 * IMPORTANT: the opp nodes should be maintained in increasing
55 * order.
56 * @kref: for reference count of the OPP.
57 * @available: true/false - marks if this OPP as available or not
58 * @dynamic: not-created from static DT entries.
59 * @turbo: true if turbo (boost) OPP
60 * @suspend: true if suspend OPP
61 * @rate: Frequency in hertz
62 * @supplies: Power supplies voltage/current values
63 * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
64 * frequency from any other OPP's frequency.
65 * @opp_table: points back to the opp_table struct this opp belongs to
66 * @np: OPP's device node.
67 * @dentry: debugfs dentry pointer (per opp)
68 *
69 * This structure stores the OPP information for a given device.
70 */
71struct dev_pm_opp {
72 struct list_head node;
73 struct kref kref;
74
75 bool available;
76 bool dynamic;
77 bool turbo;
78 bool suspend;
79 unsigned long rate;
80
81 struct dev_pm_opp_supply *supplies;
82
83 unsigned long clock_latency_ns;
84
85 struct opp_table *opp_table;
86
87 struct device_node *np;
88
89#ifdef CONFIG_DEBUG_FS
90 struct dentry *dentry;
91#endif
92};
93
94/**
95 * struct opp_device - devices managed by 'struct opp_table'
96 * @node: list node
97 * @dev: device to which the struct object belongs
98 * @dentry: debugfs dentry pointer (per device)
99 *
100 * This is an internal data structure maintaining the devices that are managed
101 * by 'struct opp_table'.
102 */
103struct opp_device {
104 struct list_head node;
105 const struct device *dev;
106
107#ifdef CONFIG_DEBUG_FS
108 struct dentry *dentry;
109#endif
110};
111
112enum opp_table_access {
113 OPP_TABLE_ACCESS_UNKNOWN = 0,
114 OPP_TABLE_ACCESS_EXCLUSIVE = 1,
115 OPP_TABLE_ACCESS_SHARED = 2,
116};
117
118/**
119 * struct opp_table - Device opp structure
120 * @node: table node - contains the devices with OPPs that
121 * have been registered. Nodes once added are not modified in this
122 * table.
123 * @head: notifier head to notify the OPP availability changes.
124 * @dev_list: list of devices that share these OPPs
125 * @opp_list: table of opps
126 * @kref: for reference count of the table.
127 * @lock: mutex protecting the opp_list.
128 * @np: struct device_node pointer for opp's DT node.
129 * @clock_latency_ns_max: Max clock latency in nanoseconds.
130 * @shared_opp: OPP is shared between multiple devices.
131 * @suspend_opp: Pointer to OPP to be used during device suspend.
132 * @supported_hw: Array of version number to support.
133 * @supported_hw_count: Number of elements in supported_hw array.
134 * @prop_name: A name to postfix to many DT properties, while parsing them.
135 * @clk: Device's clock handle
136 * @regulators: Supply regulators
137 * @regulator_count: Number of power supply regulators
138 * @set_opp: Platform specific set_opp callback
139 * @set_opp_data: Data to be passed to set_opp callback
140 * @dentry: debugfs dentry pointer of the real device directory (not links).
141 * @dentry_name: Name of the real dentry.
142 *
143 * @voltage_tolerance_v1: In percentage, for v1 bindings only.
144 *
145 * This is an internal data structure maintaining the link to opps attached to
146 * a device. This structure is not meant to be shared to users as it is
147 * meant for book keeping and private to OPP library.
148 */
149struct opp_table {
150 struct list_head node;
151
152 struct blocking_notifier_head head;
153 struct list_head dev_list;
154 struct list_head opp_list;
155 struct kref kref;
156 struct mutex lock;
157
158 struct device_node *np;
159 unsigned long clock_latency_ns_max;
160
161 /* For backward compatibility with v1 bindings */
162 unsigned int voltage_tolerance_v1;
163
164 enum opp_table_access shared_opp;
165 struct dev_pm_opp *suspend_opp;
166
167 unsigned int *supported_hw;
168 unsigned int supported_hw_count;
169 const char *prop_name;
170 struct clk *clk;
171 struct regulator **regulators;
172 unsigned int regulator_count;
173
174 int (*set_opp)(struct dev_pm_set_opp_data *data);
175 struct dev_pm_set_opp_data *set_opp_data;
176
177#ifdef CONFIG_DEBUG_FS
178 struct dentry *dentry;
179 char dentry_name[NAME_MAX];
180#endif
181};
182
183/* Routines internal to opp core */
184void _get_opp_table_kref(struct opp_table *opp_table);
185struct opp_table *_find_opp_table(struct device *dev);
186struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
187void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev, bool remove_all);
188void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all);
189struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
190void _opp_free(struct dev_pm_opp *opp);
191int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table);
192int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
193void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of);
194struct opp_table *_add_opp_table(struct device *dev);
195
196#ifdef CONFIG_OF
197void _of_init_opp_table(struct opp_table *opp_table, struct device *dev);
198#else
199static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) {}
200#endif
201
202#ifdef CONFIG_DEBUG_FS
203void opp_debug_remove_one(struct dev_pm_opp *opp);
204int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
205int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
206void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
207#else
208static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
209
210static inline int opp_debug_create_one(struct dev_pm_opp *opp,
211 struct opp_table *opp_table)
212{ return 0; }
213static inline int opp_debug_register(struct opp_device *opp_dev,
214 struct opp_table *opp_table)
215{ return 0; }
216
217static inline void opp_debug_unregister(struct opp_device *opp_dev,
218 struct opp_table *opp_table)
219{ }
220#endif /* DEBUG_FS */
221
222#endif /* __DRIVER_OPP_H__ */
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-17 02:22:25 -0400