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authorJonathan Herman <hermanjl@cs.unc.edu>2013-01-22 10:38:37 -0500
committerJonathan Herman <hermanjl@cs.unc.edu>2013-01-22 10:38:37 -0500
commitfcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch)
treea57612d1888735a2ec7972891b68c1ac5ec8faea /arch/arm/mach-tegra/dvfs.c
parent8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff)
Added missing tegra files.HEADmaster
Diffstat (limited to 'arch/arm/mach-tegra/dvfs.c')
-rw-r--r--arch/arm/mach-tegra/dvfs.c846
1 files changed, 846 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/dvfs.c b/arch/arm/mach-tegra/dvfs.c
new file mode 100644
index 00000000000..8723e6fa60d
--- /dev/null
+++ b/arch/arm/mach-tegra/dvfs.c
@@ -0,0 +1,846 @@
1/*
2 *
3 * Copyright (C) 2010 Google, Inc.
4 *
5 * Author:
6 * Colin Cross <ccross@google.com>
7 *
8 * Copyright (C) 2010-2011 NVIDIA Corporation.
9 *
10 * This software is licensed under the terms of the GNU General Public
11 * License version 2, as published by the Free Software Foundation, and
12 * may be copied, distributed, and modified under those terms.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 */
20
21#include <linux/kernel.h>
22#include <linux/clk.h>
23#include <linux/clkdev.h>
24#include <linux/debugfs.h>
25#include <linux/init.h>
26#include <linux/list.h>
27#include <linux/list_sort.h>
28#include <linux/module.h>
29#include <linux/regulator/consumer.h>
30#include <linux/seq_file.h>
31#include <linux/slab.h>
32#include <linux/suspend.h>
33#include <linux/delay.h>
34#include <linux/reboot.h>
35
36#include <mach/clk.h>
37
38#include "board.h"
39#include "clock.h"
40#include "dvfs.h"
41
42#define DVFS_RAIL_STATS_BIN 25
43#define DVFS_RAIL_STATS_SCALE 2
44#define DVFS_RAIL_STATS_RANGE ((DVFS_RAIL_STATS_TOP_BIN - 1) * \
45 DVFS_RAIL_STATS_BIN / DVFS_RAIL_STATS_SCALE)
46
47static LIST_HEAD(dvfs_rail_list);
48static DEFINE_MUTEX(dvfs_lock);
49static DEFINE_MUTEX(rail_disable_lock);
50
51static int dvfs_rail_update(struct dvfs_rail *rail);
52
53void tegra_dvfs_add_relationships(struct dvfs_relationship *rels, int n)
54{
55 int i;
56 struct dvfs_relationship *rel;
57
58 mutex_lock(&dvfs_lock);
59
60 for (i = 0; i < n; i++) {
61 rel = &rels[i];
62 list_add_tail(&rel->from_node, &rel->to->relationships_from);
63 list_add_tail(&rel->to_node, &rel->from->relationships_to);
64 }
65
66 mutex_unlock(&dvfs_lock);
67}
68
69int tegra_dvfs_init_rails(struct dvfs_rail *rails[], int n)
70{
71 int i;
72
73 mutex_lock(&dvfs_lock);
74
75 for (i = 0; i < n; i++) {
76 INIT_LIST_HEAD(&rails[i]->dvfs);
77 INIT_LIST_HEAD(&rails[i]->relationships_from);
78 INIT_LIST_HEAD(&rails[i]->relationships_to);
79 rails[i]->millivolts = rails[i]->nominal_millivolts;
80 rails[i]->new_millivolts = rails[i]->nominal_millivolts;
81 if (!rails[i]->step)
82 rails[i]->step = rails[i]->max_millivolts;
83
84 list_add_tail(&rails[i]->node, &dvfs_rail_list);
85 }
86
87 mutex_unlock(&dvfs_lock);
88
89 return 0;
90};
91
92static int dvfs_solve_relationship(struct dvfs_relationship *rel)
93{
94 return rel->solve(rel->from, rel->to);
95}
96
97/* rail statistic - called during rail init, or under dfs_lock, or with
98 CPU0 only on-line, and interrupts disabled */
99static void dvfs_rail_stats_init(struct dvfs_rail *rail, int millivolts)
100{
101 rail->stats.last_update = ktime_get();
102 if (millivolts >= rail->min_millivolts) {
103 int i = 1 + (2 * (millivolts - rail->min_millivolts) *
104 DVFS_RAIL_STATS_SCALE + DVFS_RAIL_STATS_BIN) /
105 (2 * DVFS_RAIL_STATS_BIN);
106 rail->stats.last_index = min(i, DVFS_RAIL_STATS_TOP_BIN);
107 }
108
109 if (rail->max_millivolts >
110 rail->min_millivolts + DVFS_RAIL_STATS_RANGE)
111 pr_warn("tegra_dvfs: %s: stats above %d mV will be squashed\n",
112 rail->reg_id,
113 rail->min_millivolts + DVFS_RAIL_STATS_RANGE);
114}
115
116static void dvfs_rail_stats_update(
117 struct dvfs_rail *rail, int millivolts, ktime_t now)
118{
119 rail->stats.time_at_mv[rail->stats.last_index] = ktime_add(
120 rail->stats.time_at_mv[rail->stats.last_index], ktime_sub(
121 now, rail->stats.last_update));
122 rail->stats.last_update = now;
123
124 if (rail->stats.off)
125 return;
126
127 if (millivolts >= rail->min_millivolts) {
128 int i = 1 + (2 * (millivolts - rail->min_millivolts) *
129 DVFS_RAIL_STATS_SCALE + DVFS_RAIL_STATS_BIN) /
130 (2 * DVFS_RAIL_STATS_BIN);
131 rail->stats.last_index = min(i, DVFS_RAIL_STATS_TOP_BIN);
132 } else if (millivolts == 0)
133 rail->stats.last_index = 0;
134}
135
136static void dvfs_rail_stats_pause(struct dvfs_rail *rail,
137 ktime_t delta, bool on)
138{
139 int i = on ? rail->stats.last_index : 0;
140 rail->stats.time_at_mv[i] = ktime_add(rail->stats.time_at_mv[i], delta);
141}
142
143void tegra_dvfs_rail_off(struct dvfs_rail *rail, ktime_t now)
144{
145 if (rail) {
146 dvfs_rail_stats_update(rail, 0, now);
147 rail->stats.off = true;
148 }
149}
150
151void tegra_dvfs_rail_on(struct dvfs_rail *rail, ktime_t now)
152{
153 if (rail) {
154 rail->stats.off = false;
155 dvfs_rail_stats_update(rail, rail->millivolts, now);
156 }
157}
158
159void tegra_dvfs_rail_pause(struct dvfs_rail *rail, ktime_t delta, bool on)
160{
161 if (rail)
162 dvfs_rail_stats_pause(rail, delta, on);
163}
164
165/* Sets the voltage on a dvfs rail to a specific value, and updates any
166 * rails that depend on this rail. */
167static int dvfs_rail_set_voltage(struct dvfs_rail *rail, int millivolts)
168{
169 int ret = 0;
170 struct dvfs_relationship *rel;
171 int step = (millivolts > rail->millivolts) ? rail->step : -rail->step;
172 int i;
173 int steps;
174 bool jmp_to_zero;
175
176 if (!rail->reg) {
177 if (millivolts == rail->millivolts)
178 return 0;
179 else
180 return -EINVAL;
181 }
182
183 if (rail->disabled)
184 return 0;
185
186 rail->resolving_to = true;
187 jmp_to_zero = rail->jmp_to_zero &&
188 ((millivolts == 0) || (rail->millivolts == 0));
189 steps = jmp_to_zero ? 1 :
190 DIV_ROUND_UP(abs(millivolts - rail->millivolts), rail->step);
191
192 for (i = 0; i < steps; i++) {
193 if (!jmp_to_zero &&
194 (abs(millivolts - rail->millivolts) > rail->step))
195 rail->new_millivolts = rail->millivolts + step;
196 else
197 rail->new_millivolts = millivolts;
198
199 /* Before changing the voltage, tell each rail that depends
200 * on this rail that the voltage will change.
201 * This rail will be the "from" rail in the relationship,
202 * the rail that depends on this rail will be the "to" rail.
203 * from->millivolts will be the old voltage
204 * from->new_millivolts will be the new voltage */
205 list_for_each_entry(rel, &rail->relationships_to, to_node) {
206 ret = dvfs_rail_update(rel->to);
207 if (ret)
208 goto out;
209 }
210
211 if (!rail->disabled) {
212 rail->updating = true;
213 ret = regulator_set_voltage(rail->reg,
214 rail->new_millivolts * 1000,
215 rail->max_millivolts * 1000);
216 rail->updating = false;
217 }
218 if (ret) {
219 pr_err("Failed to set dvfs regulator %s\n", rail->reg_id);
220 goto out;
221 }
222
223 rail->millivolts = rail->new_millivolts;
224 dvfs_rail_stats_update(rail, rail->millivolts, ktime_get());
225
226 /* After changing the voltage, tell each rail that depends
227 * on this rail that the voltage has changed.
228 * from->millivolts and from->new_millivolts will be the
229 * new voltage */
230 list_for_each_entry(rel, &rail->relationships_to, to_node) {
231 ret = dvfs_rail_update(rel->to);
232 if (ret)
233 goto out;
234 }
235 }
236
237 if (unlikely(rail->millivolts != millivolts)) {
238 pr_err("%s: rail didn't reach target %d in %d steps (%d)\n",
239 __func__, millivolts, steps, rail->millivolts);
240 ret = -EINVAL;
241 }
242
243out:
244 rail->resolving_to = false;
245 return ret;
246}
247
248/* Determine the minimum valid voltage for a rail, taking into account
249 * the dvfs clocks and any rails that this rail depends on. Calls
250 * dvfs_rail_set_voltage with the new voltage, which will call
251 * dvfs_rail_update on any rails that depend on this rail. */
252static int dvfs_rail_update(struct dvfs_rail *rail)
253{
254 int millivolts = 0;
255 struct dvfs *d;
256 struct dvfs_relationship *rel;
257 int ret = 0;
258 int steps;
259
260 /* if dvfs is suspended, return and handle it during resume */
261 if (rail->suspended)
262 return 0;
263
264 /* if regulators are not connected yet, return and handle it later */
265 if (!rail->reg)
266 return 0;
267
268 /* if rail update is entered while resolving circular dependencies,
269 abort recursion */
270 if (rail->resolving_to)
271 return 0;
272
273 /* Find the maximum voltage requested by any clock */
274 list_for_each_entry(d, &rail->dvfs, reg_node)
275 millivolts = max(d->cur_millivolts, millivolts);
276
277 /* retry update if limited by from-relationship to account for
278 circular dependencies */
279 steps = DIV_ROUND_UP(abs(millivolts - rail->millivolts), rail->step);
280 for (; steps >= 0; steps--) {
281 rail->new_millivolts = millivolts;
282
283 /* Check any rails that this rail depends on */
284 list_for_each_entry(rel, &rail->relationships_from, from_node)
285 rail->new_millivolts = dvfs_solve_relationship(rel);
286
287 if (rail->new_millivolts == rail->millivolts)
288 break;
289
290 ret = dvfs_rail_set_voltage(rail, rail->new_millivolts);
291 }
292
293 return ret;
294}
295
296static int dvfs_rail_connect_to_regulator(struct dvfs_rail *rail)
297{
298 struct regulator *reg;
299 int v;
300
301 if (!rail->reg) {
302 reg = regulator_get(NULL, rail->reg_id);
303 if (IS_ERR(reg)) {
304 pr_err("tegra_dvfs: failed to connect %s rail\n",
305 rail->reg_id);
306 return -EINVAL;
307 }
308 rail->reg = reg;
309 }
310
311 v = regulator_get_voltage(rail->reg);
312 if (v < 0) {
313 pr_err("tegra_dvfs: failed initial get %s voltage\n",
314 rail->reg_id);
315 return v;
316 }
317 rail->millivolts = v / 1000;
318 rail->new_millivolts = rail->millivolts;
319 dvfs_rail_stats_init(rail, rail->millivolts);
320 return 0;
321}
322
323static inline unsigned long *dvfs_get_freqs(struct dvfs *d)
324{
325 return (d->alt_freqs_state == ALT_FREQS_ENABLED) ?
326 &d->alt_freqs[0] : &d->freqs[0];
327}
328
329static int
330__tegra_dvfs_set_rate(struct dvfs *d, unsigned long rate)
331{
332 int i = 0;
333 int ret;
334 unsigned long *freqs = dvfs_get_freqs(d);
335
336 if (freqs == NULL || d->millivolts == NULL)
337 return -ENODEV;
338
339 if (rate > freqs[d->num_freqs - 1]) {
340 pr_warn("tegra_dvfs: rate %lu too high for dvfs on %s\n", rate,
341 d->clk_name);
342 return -EINVAL;
343 }
344
345 if (rate == 0) {
346 d->cur_millivolts = 0;
347 } else {
348 while (i < d->num_freqs && rate > freqs[i])
349 i++;
350
351 if ((d->max_millivolts) &&
352 (d->millivolts[i] > d->max_millivolts)) {
353 pr_warn("tegra_dvfs: voltage %d too high for dvfs on"
354 " %s\n", d->millivolts[i], d->clk_name);
355 return -EINVAL;
356 }
357 d->cur_millivolts = d->millivolts[i];
358 }
359
360 d->cur_rate = rate;
361
362 ret = dvfs_rail_update(d->dvfs_rail);
363 if (ret)
364 pr_err("Failed to set regulator %s for clock %s to %d mV\n",
365 d->dvfs_rail->reg_id, d->clk_name, d->cur_millivolts);
366
367 return ret;
368}
369
370static inline int dvfs_alt_freqs_set(struct dvfs *d, bool enable)
371{
372 if (d->alt_freqs_state == ALT_FREQS_NOT_SUPPORTED)
373 return -ENOSYS;
374
375 d->alt_freqs_state = enable ? ALT_FREQS_ENABLED : ALT_FREQS_DISABLED;
376 return 0;
377}
378
379int tegra_dvfs_alt_freqs_set(struct dvfs *d, bool enable)
380{
381 int ret;
382 enum dvfs_alt_freqs old_state;
383
384 mutex_lock(&dvfs_lock);
385
386 old_state = d->alt_freqs_state;
387 ret = dvfs_alt_freqs_set(d, enable);
388 if (!ret && (old_state != d->alt_freqs_state))
389 ret = __tegra_dvfs_set_rate(d, d->cur_rate);
390
391 mutex_unlock(&dvfs_lock);
392 return ret;
393}
394
395int tegra_dvfs_predict_millivolts(struct clk *c, unsigned long rate)
396{
397 int i;
398
399 if (!rate || !c->dvfs)
400 return 0;
401
402 if (!c->dvfs->millivolts)
403 return -ENODEV;
404
405 /*
406 * Predicted voltage can not be used across the switch to alternative
407 * frequency limits. For now, just fail the call for clock that has
408 * alternative limits initialized.
409 */
410 if (c->dvfs->alt_freqs_state != ALT_FREQS_NOT_SUPPORTED)
411 return -ENOSYS;
412
413 for (i = 0; i < c->dvfs->num_freqs; i++) {
414 if (rate <= c->dvfs->freqs[i])
415 break;
416 }
417
418 if (i == c->dvfs->num_freqs)
419 return -EINVAL;
420
421 return c->dvfs->millivolts[i];
422}
423
424int tegra_dvfs_set_rate(struct clk *c, unsigned long rate)
425{
426 int ret;
427
428 if (!c->dvfs)
429 return -EINVAL;
430
431 mutex_lock(&dvfs_lock);
432 ret = __tegra_dvfs_set_rate(c->dvfs, rate);
433 mutex_unlock(&dvfs_lock);
434
435 return ret;
436}
437EXPORT_SYMBOL(tegra_dvfs_set_rate);
438
439/* May only be called during clock init, does not take any locks on clock c. */
440int __init tegra_enable_dvfs_on_clk(struct clk *c, struct dvfs *d)
441{
442 int i;
443
444 if (c->dvfs) {
445 pr_err("Error when enabling dvfs on %s for clock %s:\n",
446 d->dvfs_rail->reg_id, c->name);
447 pr_err("DVFS already enabled for %s\n",
448 c->dvfs->dvfs_rail->reg_id);
449 return -EINVAL;
450 }
451
452 for (i = 0; i < MAX_DVFS_FREQS; i++) {
453 if (d->millivolts[i] == 0)
454 break;
455
456 d->freqs[i] *= d->freqs_mult;
457
458 /* If final frequencies are 0, pad with previous frequency */
459 if (d->freqs[i] == 0 && i > 1)
460 d->freqs[i] = d->freqs[i - 1];
461 }
462 d->num_freqs = i;
463
464 if (d->auto_dvfs) {
465 c->auto_dvfs = true;
466 clk_set_cansleep(c);
467 }
468
469 c->dvfs = d;
470
471 mutex_lock(&dvfs_lock);
472 list_add_tail(&d->reg_node, &d->dvfs_rail->dvfs);
473 mutex_unlock(&dvfs_lock);
474
475 return 0;
476}
477
478static bool tegra_dvfs_all_rails_suspended(void)
479{
480 struct dvfs_rail *rail;
481 bool all_suspended = true;
482
483 list_for_each_entry(rail, &dvfs_rail_list, node)
484 if (!rail->suspended && !rail->disabled)
485 all_suspended = false;
486
487 return all_suspended;
488}
489
490static bool tegra_dvfs_from_rails_suspended_or_solved(struct dvfs_rail *to)
491{
492 struct dvfs_relationship *rel;
493 bool all_suspended = true;
494
495 list_for_each_entry(rel, &to->relationships_from, from_node)
496 if (!rel->from->suspended && !rel->from->disabled &&
497 !rel->solved_at_nominal)
498 all_suspended = false;
499
500 return all_suspended;
501}
502
503static int tegra_dvfs_suspend_one(void)
504{
505 struct dvfs_rail *rail;
506 int ret;
507
508 list_for_each_entry(rail, &dvfs_rail_list, node) {
509 if (!rail->suspended && !rail->disabled &&
510 tegra_dvfs_from_rails_suspended_or_solved(rail)) {
511 ret = dvfs_rail_set_voltage(rail,
512 rail->nominal_millivolts);
513 if (ret)
514 return ret;
515 rail->suspended = true;
516 return 0;
517 }
518 }
519
520 return -EINVAL;
521}
522
523static void tegra_dvfs_resume(void)
524{
525 struct dvfs_rail *rail;
526
527 mutex_lock(&dvfs_lock);
528
529 list_for_each_entry(rail, &dvfs_rail_list, node)
530 rail->suspended = false;
531
532 list_for_each_entry(rail, &dvfs_rail_list, node)
533 dvfs_rail_update(rail);
534
535 mutex_unlock(&dvfs_lock);
536}
537
538static int tegra_dvfs_suspend(void)
539{
540 int ret = 0;
541
542 mutex_lock(&dvfs_lock);
543
544 while (!tegra_dvfs_all_rails_suspended()) {
545 ret = tegra_dvfs_suspend_one();
546 if (ret)
547 break;
548 }
549
550 mutex_unlock(&dvfs_lock);
551
552 if (ret)
553 tegra_dvfs_resume();
554
555 return ret;
556}
557
558static int tegra_dvfs_pm_notify(struct notifier_block *nb,
559 unsigned long event, void *data)
560{
561 switch (event) {
562 case PM_SUSPEND_PREPARE:
563 if (tegra_dvfs_suspend())
564 return NOTIFY_STOP;
565 break;
566 case PM_POST_SUSPEND:
567 tegra_dvfs_resume();
568 break;
569 }
570
571 return NOTIFY_OK;
572};
573
574static struct notifier_block tegra_dvfs_nb = {
575 .notifier_call = tegra_dvfs_pm_notify,
576};
577
578static int tegra_dvfs_reboot_notify(struct notifier_block *nb,
579 unsigned long event, void *data)
580{
581 switch (event) {
582 case SYS_RESTART:
583 case SYS_HALT:
584 case SYS_POWER_OFF:
585 tegra_dvfs_suspend();
586 return NOTIFY_OK;
587 }
588 return NOTIFY_DONE;
589}
590
591static struct notifier_block tegra_dvfs_reboot_nb = {
592 .notifier_call = tegra_dvfs_reboot_notify,
593};
594
595/* must be called with dvfs lock held */
596static void __tegra_dvfs_rail_disable(struct dvfs_rail *rail)
597{
598 int ret;
599
600 ret = dvfs_rail_set_voltage(rail, rail->nominal_millivolts);
601 if (ret)
602 pr_info("dvfs: failed to set regulator %s to disable "
603 "voltage %d\n", rail->reg_id,
604 rail->nominal_millivolts);
605 rail->disabled = true;
606}
607
608/* must be called with dvfs lock held */
609static void __tegra_dvfs_rail_enable(struct dvfs_rail *rail)
610{
611 rail->disabled = false;
612 dvfs_rail_update(rail);
613}
614
615void tegra_dvfs_rail_enable(struct dvfs_rail *rail)
616{
617 mutex_lock(&rail_disable_lock);
618
619 if (rail->disabled) {
620 mutex_lock(&dvfs_lock);
621 __tegra_dvfs_rail_enable(rail);
622 mutex_unlock(&dvfs_lock);
623
624 tegra_dvfs_rail_post_enable(rail);
625 }
626 mutex_unlock(&rail_disable_lock);
627
628}
629
630void tegra_dvfs_rail_disable(struct dvfs_rail *rail)
631{
632 mutex_lock(&rail_disable_lock);
633 if (rail->disabled)
634 goto out;
635
636 /* rail disable will set it to nominal voltage underneath clock
637 framework - need to re-configure clock rates that are not safe
638 at nominal (yes, unsafe at nominal is ugly, but possible). Rate
639 change must be done outside of dvfs lock. */
640 if (tegra_dvfs_rail_disable_prepare(rail)) {
641 pr_info("dvfs: failed to prepare regulator %s to disable\n",
642 rail->reg_id);
643 goto out;
644 }
645
646 mutex_lock(&dvfs_lock);
647 __tegra_dvfs_rail_disable(rail);
648 mutex_unlock(&dvfs_lock);
649out:
650 mutex_unlock(&rail_disable_lock);
651}
652
653int tegra_dvfs_rail_disable_by_name(const char *reg_id)
654{
655 struct dvfs_rail *rail = tegra_dvfs_get_rail_by_name(reg_id);
656 if (!rail)
657 return -EINVAL;
658
659 tegra_dvfs_rail_disable(rail);
660 return 0;
661}
662
663struct dvfs_rail *tegra_dvfs_get_rail_by_name(const char *reg_id)
664{
665 struct dvfs_rail *rail;
666
667 mutex_lock(&dvfs_lock);
668 list_for_each_entry(rail, &dvfs_rail_list, node) {
669 if (!strcmp(reg_id, rail->reg_id)) {
670 mutex_unlock(&dvfs_lock);
671 return rail;
672 }
673 }
674 mutex_unlock(&dvfs_lock);
675 return NULL;
676}
677
678bool tegra_dvfs_rail_updating(struct clk *clk)
679{
680 return (!clk ? false :
681 (!clk->dvfs ? false :
682 (!clk->dvfs->dvfs_rail ? false :
683 (clk->dvfs->dvfs_rail->updating))));
684}
685
686/*
687 * Iterate through all the dvfs regulators, finding the regulator exported
688 * by the regulator api for each one. Must be called in late init, after
689 * all the regulator api's regulators are initialized.
690 */
691int __init tegra_dvfs_late_init(void)
692{
693 bool connected = true;
694 struct dvfs_rail *rail;
695
696 mutex_lock(&dvfs_lock);
697
698 list_for_each_entry(rail, &dvfs_rail_list, node)
699 if (dvfs_rail_connect_to_regulator(rail))
700 connected = false;
701
702 list_for_each_entry(rail, &dvfs_rail_list, node)
703 if (connected)
704 dvfs_rail_update(rail);
705 else
706 __tegra_dvfs_rail_disable(rail);
707
708 mutex_unlock(&dvfs_lock);
709
710 register_pm_notifier(&tegra_dvfs_nb);
711 register_reboot_notifier(&tegra_dvfs_reboot_nb);
712
713 return 0;
714}
715late_initcall(tegra_dvfs_late_init);
716
717#ifdef CONFIG_DEBUG_FS
718static int dvfs_tree_sort_cmp(void *p, struct list_head *a, struct list_head *b)
719{
720 struct dvfs *da = list_entry(a, struct dvfs, reg_node);
721 struct dvfs *db = list_entry(b, struct dvfs, reg_node);
722 int ret;
723
724 ret = strcmp(da->dvfs_rail->reg_id, db->dvfs_rail->reg_id);
725 if (ret != 0)
726 return ret;
727
728 if (da->cur_millivolts < db->cur_millivolts)
729 return 1;
730 if (da->cur_millivolts > db->cur_millivolts)
731 return -1;
732
733 return strcmp(da->clk_name, db->clk_name);
734}
735
736static int dvfs_tree_show(struct seq_file *s, void *data)
737{
738 struct dvfs *d;
739 struct dvfs_rail *rail;
740 struct dvfs_relationship *rel;
741
742 seq_printf(s, " clock rate mV\n");
743 seq_printf(s, "--------------------------------\n");
744
745 mutex_lock(&dvfs_lock);
746
747 list_for_each_entry(rail, &dvfs_rail_list, node) {
748 seq_printf(s, "%s %d mV%s:\n", rail->reg_id,
749 rail->millivolts, rail->disabled ? " disabled" : "");
750 list_for_each_entry(rel, &rail->relationships_from, from_node) {
751 seq_printf(s, " %-10s %-7d mV %-4d mV\n",
752 rel->from->reg_id,
753 rel->from->millivolts,
754 dvfs_solve_relationship(rel));
755 }
756
757 list_sort(NULL, &rail->dvfs, dvfs_tree_sort_cmp);
758
759 list_for_each_entry(d, &rail->dvfs, reg_node) {
760 seq_printf(s, " %-10s %-10lu %-4d mV\n", d->clk_name,
761 d->cur_rate, d->cur_millivolts);
762 }
763 }
764
765 mutex_unlock(&dvfs_lock);
766
767 return 0;
768}
769
770static int dvfs_tree_open(struct inode *inode, struct file *file)
771{
772 return single_open(file, dvfs_tree_show, inode->i_private);
773}
774
775static const struct file_operations dvfs_tree_fops = {
776 .open = dvfs_tree_open,
777 .read = seq_read,
778 .llseek = seq_lseek,
779 .release = single_release,
780};
781
782static int rail_stats_show(struct seq_file *s, void *data)
783{
784 int i;
785 struct dvfs_rail *rail;
786
787 seq_printf(s, "%-12s %-10s (bin: %d.%dmV)\n", "millivolts", "time",
788 DVFS_RAIL_STATS_BIN / DVFS_RAIL_STATS_SCALE,
789 ((DVFS_RAIL_STATS_BIN * 100) / DVFS_RAIL_STATS_SCALE) % 100);
790
791 mutex_lock(&dvfs_lock);
792
793 list_for_each_entry(rail, &dvfs_rail_list, node) {
794 seq_printf(s, "%s\n", rail->reg_id);
795 dvfs_rail_stats_update(rail, -1, ktime_get());
796
797 seq_printf(s, "%-12d %-10llu\n", 0,
798 cputime64_to_clock_t(msecs_to_jiffies(
799 ktime_to_ms(rail->stats.time_at_mv[0]))));
800
801 for (i = 1; i <= DVFS_RAIL_STATS_TOP_BIN; i++) {
802 ktime_t ktime_zero = ktime_set(0, 0);
803 if (ktime_equal(rail->stats.time_at_mv[i], ktime_zero))
804 continue;
805 seq_printf(s, "%-12d %-10llu\n",
806 rail->min_millivolts + (i - 1) *
807 DVFS_RAIL_STATS_BIN / DVFS_RAIL_STATS_SCALE,
808 cputime64_to_clock_t(msecs_to_jiffies(
809 ktime_to_ms(rail->stats.time_at_mv[i])))
810 );
811 }
812 }
813 mutex_unlock(&dvfs_lock);
814 return 0;
815}
816
817static int rail_stats_open(struct inode *inode, struct file *file)
818{
819 return single_open(file, rail_stats_show, inode->i_private);
820}
821
822static const struct file_operations rail_stats_fops = {
823 .open = rail_stats_open,
824 .read = seq_read,
825 .llseek = seq_lseek,
826 .release = single_release,
827};
828
829int __init dvfs_debugfs_init(struct dentry *clk_debugfs_root)
830{
831 struct dentry *d;
832
833 d = debugfs_create_file("dvfs", S_IRUGO, clk_debugfs_root, NULL,
834 &dvfs_tree_fops);
835 if (!d)
836 return -ENOMEM;
837
838 d = debugfs_create_file("rails", S_IRUGO, clk_debugfs_root, NULL,
839 &rail_stats_fops);
840 if (!d)
841 return -ENOMEM;
842
843 return 0;
844}
845
846#endif