Commit | Line | Data |
---|---|---|
8b5ee113 | 1 | /* |
de9186c2 | 2 | * SuperH clock framework |
8b5ee113 | 3 | * |
960bc368 | 4 | * Copyright (C) 2005 - 2010 Paul Mundt |
8b5ee113 MD |
5 | * |
6 | * This clock framework is derived from the OMAP version by: | |
7 | * | |
8 | * Copyright (C) 2004 - 2008 Nokia Corporation | |
9 | * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com> | |
10 | * | |
11 | * Modified for omap shared clock framework by Tony Lindgren <tony@atomide.com> | |
12 | * | |
13 | * This file is subject to the terms and conditions of the GNU General Public | |
14 | * License. See the file "COPYING" in the main directory of this archive | |
15 | * for more details. | |
16 | */ | |
550a1ef1 PM |
17 | #define pr_fmt(fmt) "clock: " fmt |
18 | ||
8b5ee113 MD |
19 | #include <linux/kernel.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/kobject.h> | |
25 | #include <linux/sysdev.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/err.h> | |
28085bc5 | 28 | #include <linux/io.h> |
8b5ee113 MD |
29 | #include <linux/debugfs.h> |
30 | #include <linux/cpufreq.h> | |
31 | #include <linux/clk.h> | |
32 | #include <linux/sh_clk.h> | |
33 | ||
34 | static LIST_HEAD(clock_list); | |
35 | static DEFINE_SPINLOCK(clock_lock); | |
36 | static DEFINE_MUTEX(clock_list_sem); | |
37 | ||
38 | void clk_rate_table_build(struct clk *clk, | |
39 | struct cpufreq_frequency_table *freq_table, | |
40 | int nr_freqs, | |
41 | struct clk_div_mult_table *src_table, | |
42 | unsigned long *bitmap) | |
43 | { | |
44 | unsigned long mult, div; | |
45 | unsigned long freq; | |
46 | int i; | |
47 | ||
f586903d PM |
48 | clk->nr_freqs = nr_freqs; |
49 | ||
8b5ee113 MD |
50 | for (i = 0; i < nr_freqs; i++) { |
51 | div = 1; | |
52 | mult = 1; | |
53 | ||
54 | if (src_table->divisors && i < src_table->nr_divisors) | |
55 | div = src_table->divisors[i]; | |
56 | ||
57 | if (src_table->multipliers && i < src_table->nr_multipliers) | |
58 | mult = src_table->multipliers[i]; | |
59 | ||
60 | if (!div || !mult || (bitmap && !test_bit(i, bitmap))) | |
61 | freq = CPUFREQ_ENTRY_INVALID; | |
62 | else | |
63 | freq = clk->parent->rate * mult / div; | |
64 | ||
65 | freq_table[i].index = i; | |
66 | freq_table[i].frequency = freq; | |
67 | } | |
68 | ||
69 | /* Termination entry */ | |
70 | freq_table[i].index = i; | |
71 | freq_table[i].frequency = CPUFREQ_TABLE_END; | |
72 | } | |
73 | ||
f586903d PM |
74 | struct clk_rate_round_data; |
75 | ||
76 | struct clk_rate_round_data { | |
77 | unsigned long rate; | |
78 | unsigned int min, max; | |
8e122db6 | 79 | long (*func)(unsigned int, struct clk_rate_round_data *); |
f586903d PM |
80 | void *arg; |
81 | }; | |
82 | ||
83 | #define for_each_frequency(pos, r, freq) \ | |
e5690e0d | 84 | for (pos = r->min, freq = r->func(pos, r); \ |
c2590f4a | 85 | pos <= r->max; pos++, freq = r->func(pos, r)) \ |
f586903d PM |
86 | if (unlikely(freq == 0)) \ |
87 | ; \ | |
88 | else | |
89 | ||
90 | static long clk_rate_round_helper(struct clk_rate_round_data *rounder) | |
8b5ee113 MD |
91 | { |
92 | unsigned long rate_error, rate_error_prev = ~0UL; | |
f586903d PM |
93 | unsigned long rate_best_fit = rounder->rate; |
94 | unsigned long highest, lowest, freq; | |
8b5ee113 MD |
95 | int i; |
96 | ||
960bc368 PM |
97 | highest = 0; |
98 | lowest = ~0UL; | |
99 | ||
f586903d | 100 | for_each_frequency(i, rounder, freq) { |
960bc368 PM |
101 | if (freq > highest) |
102 | highest = freq; | |
103 | if (freq < lowest) | |
104 | lowest = freq; | |
105 | ||
f586903d | 106 | rate_error = abs(freq - rounder->rate); |
8b5ee113 MD |
107 | if (rate_error < rate_error_prev) { |
108 | rate_best_fit = freq; | |
109 | rate_error_prev = rate_error; | |
110 | } | |
111 | ||
112 | if (rate_error == 0) | |
113 | break; | |
114 | } | |
115 | ||
f586903d | 116 | if (rounder->rate >= highest) |
960bc368 | 117 | rate_best_fit = highest; |
f586903d | 118 | if (rounder->rate <= lowest) |
960bc368 PM |
119 | rate_best_fit = lowest; |
120 | ||
8b5ee113 MD |
121 | return rate_best_fit; |
122 | } | |
123 | ||
f586903d PM |
124 | static long clk_rate_table_iter(unsigned int pos, |
125 | struct clk_rate_round_data *rounder) | |
126 | { | |
127 | struct cpufreq_frequency_table *freq_table = rounder->arg; | |
128 | unsigned long freq = freq_table[pos].frequency; | |
129 | ||
130 | if (freq == CPUFREQ_ENTRY_INVALID) | |
131 | freq = 0; | |
132 | ||
133 | return freq; | |
134 | } | |
135 | ||
136 | long clk_rate_table_round(struct clk *clk, | |
137 | struct cpufreq_frequency_table *freq_table, | |
138 | unsigned long rate) | |
139 | { | |
140 | struct clk_rate_round_data table_round = { | |
141 | .min = 0, | |
c2590f4a | 142 | .max = clk->nr_freqs - 1, |
f586903d PM |
143 | .func = clk_rate_table_iter, |
144 | .arg = freq_table, | |
145 | .rate = rate, | |
146 | }; | |
147 | ||
c2590f4a KM |
148 | if (clk->nr_freqs < 1) |
149 | return 0; | |
150 | ||
f586903d PM |
151 | return clk_rate_round_helper(&table_round); |
152 | } | |
153 | ||
8e122db6 PM |
154 | static long clk_rate_div_range_iter(unsigned int pos, |
155 | struct clk_rate_round_data *rounder) | |
156 | { | |
157 | return clk_get_rate(rounder->arg) / pos; | |
158 | } | |
159 | ||
160 | long clk_rate_div_range_round(struct clk *clk, unsigned int div_min, | |
161 | unsigned int div_max, unsigned long rate) | |
162 | { | |
163 | struct clk_rate_round_data div_range_round = { | |
164 | .min = div_min, | |
165 | .max = div_max, | |
166 | .func = clk_rate_div_range_iter, | |
167 | .arg = clk_get_parent(clk), | |
168 | .rate = rate, | |
169 | }; | |
170 | ||
171 | return clk_rate_round_helper(&div_range_round); | |
172 | } | |
173 | ||
8b5ee113 MD |
174 | int clk_rate_table_find(struct clk *clk, |
175 | struct cpufreq_frequency_table *freq_table, | |
176 | unsigned long rate) | |
177 | { | |
178 | int i; | |
179 | ||
180 | for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
181 | unsigned long freq = freq_table[i].frequency; | |
182 | ||
183 | if (freq == CPUFREQ_ENTRY_INVALID) | |
184 | continue; | |
185 | ||
186 | if (freq == rate) | |
187 | return i; | |
188 | } | |
189 | ||
190 | return -ENOENT; | |
191 | } | |
192 | ||
193 | /* Used for clocks that always have same value as the parent clock */ | |
194 | unsigned long followparent_recalc(struct clk *clk) | |
195 | { | |
196 | return clk->parent ? clk->parent->rate : 0; | |
197 | } | |
198 | ||
199 | int clk_reparent(struct clk *child, struct clk *parent) | |
200 | { | |
201 | list_del_init(&child->sibling); | |
202 | if (parent) | |
203 | list_add(&child->sibling, &parent->children); | |
204 | child->parent = parent; | |
205 | ||
206 | /* now do the debugfs renaming to reattach the child | |
207 | to the proper parent */ | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | /* Propagate rate to children */ | |
213 | void propagate_rate(struct clk *tclk) | |
214 | { | |
215 | struct clk *clkp; | |
216 | ||
217 | list_for_each_entry(clkp, &tclk->children, sibling) { | |
218 | if (clkp->ops && clkp->ops->recalc) | |
219 | clkp->rate = clkp->ops->recalc(clkp); | |
220 | ||
221 | propagate_rate(clkp); | |
222 | } | |
223 | } | |
224 | ||
225 | static void __clk_disable(struct clk *clk) | |
226 | { | |
69395396 MD |
227 | if (WARN(!clk->usecount, "Trying to disable clock %p with 0 usecount\n", |
228 | clk)) | |
8b5ee113 | 229 | return; |
8b5ee113 MD |
230 | |
231 | if (!(--clk->usecount)) { | |
232 | if (likely(clk->ops && clk->ops->disable)) | |
233 | clk->ops->disable(clk); | |
234 | if (likely(clk->parent)) | |
235 | __clk_disable(clk->parent); | |
236 | } | |
237 | } | |
238 | ||
239 | void clk_disable(struct clk *clk) | |
240 | { | |
241 | unsigned long flags; | |
242 | ||
243 | if (!clk) | |
244 | return; | |
245 | ||
246 | spin_lock_irqsave(&clock_lock, flags); | |
247 | __clk_disable(clk); | |
248 | spin_unlock_irqrestore(&clock_lock, flags); | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(clk_disable); | |
251 | ||
252 | static int __clk_enable(struct clk *clk) | |
253 | { | |
254 | int ret = 0; | |
255 | ||
256 | if (clk->usecount++ == 0) { | |
257 | if (clk->parent) { | |
258 | ret = __clk_enable(clk->parent); | |
259 | if (unlikely(ret)) | |
260 | goto err; | |
261 | } | |
262 | ||
263 | if (clk->ops && clk->ops->enable) { | |
264 | ret = clk->ops->enable(clk); | |
265 | if (ret) { | |
266 | if (clk->parent) | |
267 | __clk_disable(clk->parent); | |
268 | goto err; | |
269 | } | |
270 | } | |
271 | } | |
272 | ||
273 | return ret; | |
274 | err: | |
275 | clk->usecount--; | |
276 | return ret; | |
277 | } | |
278 | ||
279 | int clk_enable(struct clk *clk) | |
280 | { | |
281 | unsigned long flags; | |
282 | int ret; | |
283 | ||
284 | if (!clk) | |
285 | return -EINVAL; | |
286 | ||
287 | spin_lock_irqsave(&clock_lock, flags); | |
288 | ret = __clk_enable(clk); | |
289 | spin_unlock_irqrestore(&clock_lock, flags); | |
290 | ||
291 | return ret; | |
292 | } | |
293 | EXPORT_SYMBOL_GPL(clk_enable); | |
294 | ||
295 | static LIST_HEAD(root_clks); | |
296 | ||
297 | /** | |
298 | * recalculate_root_clocks - recalculate and propagate all root clocks | |
299 | * | |
300 | * Recalculates all root clocks (clocks with no parent), which if the | |
301 | * clock's .recalc is set correctly, should also propagate their rates. | |
302 | * Called at init. | |
303 | */ | |
304 | void recalculate_root_clocks(void) | |
305 | { | |
306 | struct clk *clkp; | |
307 | ||
308 | list_for_each_entry(clkp, &root_clks, sibling) { | |
309 | if (clkp->ops && clkp->ops->recalc) | |
310 | clkp->rate = clkp->ops->recalc(clkp); | |
311 | propagate_rate(clkp); | |
312 | } | |
313 | } | |
314 | ||
28085bc5 PM |
315 | static struct clk_mapping dummy_mapping; |
316 | ||
317 | static struct clk *lookup_root_clock(struct clk *clk) | |
318 | { | |
319 | while (clk->parent) | |
320 | clk = clk->parent; | |
321 | ||
322 | return clk; | |
323 | } | |
324 | ||
325 | static int clk_establish_mapping(struct clk *clk) | |
326 | { | |
327 | struct clk_mapping *mapping = clk->mapping; | |
328 | ||
329 | /* | |
330 | * Propagate mappings. | |
331 | */ | |
332 | if (!mapping) { | |
333 | struct clk *clkp; | |
334 | ||
335 | /* | |
336 | * dummy mapping for root clocks with no specified ranges | |
337 | */ | |
338 | if (!clk->parent) { | |
339 | clk->mapping = &dummy_mapping; | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /* | |
344 | * If we're on a child clock and it provides no mapping of its | |
345 | * own, inherit the mapping from its root clock. | |
346 | */ | |
347 | clkp = lookup_root_clock(clk); | |
348 | mapping = clkp->mapping; | |
349 | BUG_ON(!mapping); | |
350 | } | |
351 | ||
352 | /* | |
353 | * Establish initial mapping. | |
354 | */ | |
355 | if (!mapping->base && mapping->phys) { | |
356 | kref_init(&mapping->ref); | |
357 | ||
358 | mapping->base = ioremap_nocache(mapping->phys, mapping->len); | |
359 | if (unlikely(!mapping->base)) | |
360 | return -ENXIO; | |
361 | } else if (mapping->base) { | |
362 | /* | |
363 | * Bump the refcount for an existing mapping | |
364 | */ | |
365 | kref_get(&mapping->ref); | |
366 | } | |
367 | ||
368 | clk->mapping = mapping; | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static void clk_destroy_mapping(struct kref *kref) | |
373 | { | |
374 | struct clk_mapping *mapping; | |
375 | ||
376 | mapping = container_of(kref, struct clk_mapping, ref); | |
377 | ||
378 | iounmap(mapping->base); | |
379 | } | |
380 | ||
381 | static void clk_teardown_mapping(struct clk *clk) | |
382 | { | |
383 | struct clk_mapping *mapping = clk->mapping; | |
384 | ||
385 | /* Nothing to do */ | |
386 | if (mapping == &dummy_mapping) | |
387 | return; | |
388 | ||
389 | kref_put(&mapping->ref, clk_destroy_mapping); | |
390 | clk->mapping = NULL; | |
391 | } | |
392 | ||
8b5ee113 MD |
393 | int clk_register(struct clk *clk) |
394 | { | |
28085bc5 PM |
395 | int ret; |
396 | ||
8b5ee113 MD |
397 | if (clk == NULL || IS_ERR(clk)) |
398 | return -EINVAL; | |
399 | ||
400 | /* | |
401 | * trap out already registered clocks | |
402 | */ | |
403 | if (clk->node.next || clk->node.prev) | |
404 | return 0; | |
405 | ||
406 | mutex_lock(&clock_list_sem); | |
407 | ||
408 | INIT_LIST_HEAD(&clk->children); | |
409 | clk->usecount = 0; | |
410 | ||
28085bc5 PM |
411 | ret = clk_establish_mapping(clk); |
412 | if (unlikely(ret)) | |
413 | goto out_unlock; | |
414 | ||
8b5ee113 MD |
415 | if (clk->parent) |
416 | list_add(&clk->sibling, &clk->parent->children); | |
417 | else | |
418 | list_add(&clk->sibling, &root_clks); | |
419 | ||
420 | list_add(&clk->node, &clock_list); | |
421 | if (clk->ops && clk->ops->init) | |
422 | clk->ops->init(clk); | |
28085bc5 PM |
423 | |
424 | out_unlock: | |
8b5ee113 MD |
425 | mutex_unlock(&clock_list_sem); |
426 | ||
28085bc5 | 427 | return ret; |
8b5ee113 MD |
428 | } |
429 | EXPORT_SYMBOL_GPL(clk_register); | |
430 | ||
431 | void clk_unregister(struct clk *clk) | |
432 | { | |
433 | mutex_lock(&clock_list_sem); | |
434 | list_del(&clk->sibling); | |
435 | list_del(&clk->node); | |
28085bc5 | 436 | clk_teardown_mapping(clk); |
8b5ee113 MD |
437 | mutex_unlock(&clock_list_sem); |
438 | } | |
439 | EXPORT_SYMBOL_GPL(clk_unregister); | |
440 | ||
441 | void clk_enable_init_clocks(void) | |
442 | { | |
443 | struct clk *clkp; | |
444 | ||
445 | list_for_each_entry(clkp, &clock_list, node) | |
446 | if (clkp->flags & CLK_ENABLE_ON_INIT) | |
447 | clk_enable(clkp); | |
448 | } | |
449 | ||
450 | unsigned long clk_get_rate(struct clk *clk) | |
451 | { | |
452 | return clk->rate; | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(clk_get_rate); | |
455 | ||
456 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
457 | { | |
458 | return clk_set_rate_ex(clk, rate, 0); | |
459 | } | |
460 | EXPORT_SYMBOL_GPL(clk_set_rate); | |
461 | ||
462 | int clk_set_rate_ex(struct clk *clk, unsigned long rate, int algo_id) | |
463 | { | |
464 | int ret = -EOPNOTSUPP; | |
465 | unsigned long flags; | |
466 | ||
467 | spin_lock_irqsave(&clock_lock, flags); | |
468 | ||
469 | if (likely(clk->ops && clk->ops->set_rate)) { | |
470 | ret = clk->ops->set_rate(clk, rate, algo_id); | |
471 | if (ret != 0) | |
472 | goto out_unlock; | |
473 | } else { | |
474 | clk->rate = rate; | |
475 | ret = 0; | |
476 | } | |
477 | ||
478 | if (clk->ops && clk->ops->recalc) | |
479 | clk->rate = clk->ops->recalc(clk); | |
480 | ||
481 | propagate_rate(clk); | |
482 | ||
483 | out_unlock: | |
484 | spin_unlock_irqrestore(&clock_lock, flags); | |
485 | ||
486 | return ret; | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(clk_set_rate_ex); | |
489 | ||
490 | int clk_set_parent(struct clk *clk, struct clk *parent) | |
491 | { | |
492 | unsigned long flags; | |
493 | int ret = -EINVAL; | |
494 | ||
495 | if (!parent || !clk) | |
496 | return ret; | |
497 | if (clk->parent == parent) | |
498 | return 0; | |
499 | ||
500 | spin_lock_irqsave(&clock_lock, flags); | |
501 | if (clk->usecount == 0) { | |
502 | if (clk->ops->set_parent) | |
503 | ret = clk->ops->set_parent(clk, parent); | |
504 | else | |
505 | ret = clk_reparent(clk, parent); | |
506 | ||
507 | if (ret == 0) { | |
8b5ee113 MD |
508 | if (clk->ops->recalc) |
509 | clk->rate = clk->ops->recalc(clk); | |
550a1ef1 | 510 | pr_debug("set parent of %p to %p (new rate %ld)\n", |
69395396 | 511 | clk, clk->parent, clk->rate); |
8b5ee113 MD |
512 | propagate_rate(clk); |
513 | } | |
514 | } else | |
515 | ret = -EBUSY; | |
516 | spin_unlock_irqrestore(&clock_lock, flags); | |
517 | ||
518 | return ret; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(clk_set_parent); | |
521 | ||
522 | struct clk *clk_get_parent(struct clk *clk) | |
523 | { | |
524 | return clk->parent; | |
525 | } | |
526 | EXPORT_SYMBOL_GPL(clk_get_parent); | |
527 | ||
528 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
529 | { | |
530 | if (likely(clk->ops && clk->ops->round_rate)) { | |
531 | unsigned long flags, rounded; | |
532 | ||
533 | spin_lock_irqsave(&clock_lock, flags); | |
534 | rounded = clk->ops->round_rate(clk, rate); | |
535 | spin_unlock_irqrestore(&clock_lock, flags); | |
536 | ||
537 | return rounded; | |
538 | } | |
539 | ||
540 | return clk_get_rate(clk); | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(clk_round_rate); | |
543 | ||
544 | #ifdef CONFIG_PM | |
545 | static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state) | |
546 | { | |
547 | static pm_message_t prev_state; | |
548 | struct clk *clkp; | |
549 | ||
550 | switch (state.event) { | |
551 | case PM_EVENT_ON: | |
552 | /* Resumeing from hibernation */ | |
553 | if (prev_state.event != PM_EVENT_FREEZE) | |
554 | break; | |
555 | ||
556 | list_for_each_entry(clkp, &clock_list, node) { | |
557 | if (likely(clkp->ops)) { | |
558 | unsigned long rate = clkp->rate; | |
559 | ||
560 | if (likely(clkp->ops->set_parent)) | |
561 | clkp->ops->set_parent(clkp, | |
562 | clkp->parent); | |
563 | if (likely(clkp->ops->set_rate)) | |
564 | clkp->ops->set_rate(clkp, | |
565 | rate, NO_CHANGE); | |
566 | else if (likely(clkp->ops->recalc)) | |
567 | clkp->rate = clkp->ops->recalc(clkp); | |
568 | } | |
569 | } | |
570 | break; | |
571 | case PM_EVENT_FREEZE: | |
572 | break; | |
573 | case PM_EVENT_SUSPEND: | |
574 | break; | |
575 | } | |
576 | ||
577 | prev_state = state; | |
578 | return 0; | |
579 | } | |
580 | ||
581 | static int clks_sysdev_resume(struct sys_device *dev) | |
582 | { | |
583 | return clks_sysdev_suspend(dev, PMSG_ON); | |
584 | } | |
585 | ||
586 | static struct sysdev_class clks_sysdev_class = { | |
587 | .name = "clks", | |
588 | }; | |
589 | ||
590 | static struct sysdev_driver clks_sysdev_driver = { | |
591 | .suspend = clks_sysdev_suspend, | |
592 | .resume = clks_sysdev_resume, | |
593 | }; | |
594 | ||
595 | static struct sys_device clks_sysdev_dev = { | |
596 | .cls = &clks_sysdev_class, | |
597 | }; | |
598 | ||
599 | static int __init clk_sysdev_init(void) | |
600 | { | |
601 | sysdev_class_register(&clks_sysdev_class); | |
602 | sysdev_driver_register(&clks_sysdev_class, &clks_sysdev_driver); | |
603 | sysdev_register(&clks_sysdev_dev); | |
604 | ||
605 | return 0; | |
606 | } | |
607 | subsys_initcall(clk_sysdev_init); | |
608 | #endif | |
609 | ||
610 | /* | |
611 | * debugfs support to trace clock tree hierarchy and attributes | |
612 | */ | |
613 | static struct dentry *clk_debugfs_root; | |
614 | ||
615 | static int clk_debugfs_register_one(struct clk *c) | |
616 | { | |
617 | int err; | |
618 | struct dentry *d, *child, *child_tmp; | |
619 | struct clk *pa = c->parent; | |
620 | char s[255]; | |
621 | char *p = s; | |
622 | ||
69395396 | 623 | p += sprintf(p, "%p", c); |
8b5ee113 MD |
624 | d = debugfs_create_dir(s, pa ? pa->dentry : clk_debugfs_root); |
625 | if (!d) | |
626 | return -ENOMEM; | |
627 | c->dentry = d; | |
628 | ||
629 | d = debugfs_create_u8("usecount", S_IRUGO, c->dentry, (u8 *)&c->usecount); | |
630 | if (!d) { | |
631 | err = -ENOMEM; | |
632 | goto err_out; | |
633 | } | |
634 | d = debugfs_create_u32("rate", S_IRUGO, c->dentry, (u32 *)&c->rate); | |
635 | if (!d) { | |
636 | err = -ENOMEM; | |
637 | goto err_out; | |
638 | } | |
639 | d = debugfs_create_x32("flags", S_IRUGO, c->dentry, (u32 *)&c->flags); | |
640 | if (!d) { | |
641 | err = -ENOMEM; | |
642 | goto err_out; | |
643 | } | |
644 | return 0; | |
645 | ||
646 | err_out: | |
647 | d = c->dentry; | |
648 | list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child) | |
649 | debugfs_remove(child); | |
650 | debugfs_remove(c->dentry); | |
651 | return err; | |
652 | } | |
653 | ||
654 | static int clk_debugfs_register(struct clk *c) | |
655 | { | |
656 | int err; | |
657 | struct clk *pa = c->parent; | |
658 | ||
659 | if (pa && !pa->dentry) { | |
660 | err = clk_debugfs_register(pa); | |
661 | if (err) | |
662 | return err; | |
663 | } | |
664 | ||
69395396 | 665 | if (!c->dentry) { |
8b5ee113 MD |
666 | err = clk_debugfs_register_one(c); |
667 | if (err) | |
668 | return err; | |
669 | } | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int __init clk_debugfs_init(void) | |
674 | { | |
675 | struct clk *c; | |
676 | struct dentry *d; | |
677 | int err; | |
678 | ||
679 | d = debugfs_create_dir("clock", NULL); | |
680 | if (!d) | |
681 | return -ENOMEM; | |
682 | clk_debugfs_root = d; | |
683 | ||
684 | list_for_each_entry(c, &clock_list, node) { | |
685 | err = clk_debugfs_register(c); | |
686 | if (err) | |
687 | goto err_out; | |
688 | } | |
689 | return 0; | |
690 | err_out: | |
691 | debugfs_remove_recursive(clk_debugfs_root); | |
692 | return err; | |
693 | } | |
694 | late_initcall(clk_debugfs_init); |