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1/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 */
12
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/device.h>
17#include <linux/io.h>
18#include <linux/err.h>
19#include <linux/export.h>
20#include <linux/slab.h>
21#include <linux/mutex.h>
22#include <linux/clk.h>
23#include <linux/coresight.h>
24#include <linux/of_platform.h>
25#include <linux/delay.h>
26#include <linux/pm_runtime.h>
27
28#include "coresight-priv.h"
29
30static DEFINE_MUTEX(coresight_mutex);
31
32/**
33 * struct coresight_node - elements of a path, from source to sink
34 * @csdev: Address of an element.
35 * @link: hook to the list.
36 */
37struct coresight_node {
38 struct coresight_device *csdev;
39 struct list_head link;
40};
41
42/*
43 * When operating Coresight drivers from the sysFS interface, only a single
44 * path can exist from a tracer (associated to a CPU) to a sink.
45 */
46static DEFINE_PER_CPU(struct list_head *, sysfs_path);
47
48static int coresight_id_match(struct device *dev, void *data)
49{
50 int trace_id, i_trace_id;
51 struct coresight_device *csdev, *i_csdev;
52
53 csdev = data;
54 i_csdev = to_coresight_device(dev);
55
56 /*
57 * No need to care about oneself and components that are not
58 * sources or not enabled
59 */
60 if (i_csdev == csdev || !i_csdev->enable ||
61 i_csdev->type != CORESIGHT_DEV_TYPE_SOURCE)
62 return 0;
63
64 /* Get the source ID for both compoment */
65 trace_id = source_ops(csdev)->trace_id(csdev);
66 i_trace_id = source_ops(i_csdev)->trace_id(i_csdev);
67
68 /* All you need is one */
69 if (trace_id == i_trace_id)
70 return 1;
71
72 return 0;
73}
74
75static int coresight_source_is_unique(struct coresight_device *csdev)
76{
77 int trace_id = source_ops(csdev)->trace_id(csdev);
78
79 /* this shouldn't happen */
80 if (trace_id < 0)
81 return 0;
82
83 return !bus_for_each_dev(&coresight_bustype, NULL,
84 csdev, coresight_id_match);
85}
86
87static int coresight_find_link_inport(struct coresight_device *csdev,
88 struct coresight_device *parent)
89{
90 int i;
91 struct coresight_connection *conn;
92
93 for (i = 0; i < parent->nr_outport; i++) {
94 conn = &parent->conns[i];
95 if (conn->child_dev == csdev)
96 return conn->child_port;
97 }
98
99 dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
100 dev_name(&parent->dev), dev_name(&csdev->dev));
101
102 return 0;
103}
104
105static int coresight_find_link_outport(struct coresight_device *csdev,
106 struct coresight_device *child)
107{
108 int i;
109 struct coresight_connection *conn;
110
111 for (i = 0; i < csdev->nr_outport; i++) {
112 conn = &csdev->conns[i];
113 if (conn->child_dev == child)
114 return conn->outport;
115 }
116
117 dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
118 dev_name(&csdev->dev), dev_name(&child->dev));
119
120 return 0;
121}
122
123static int coresight_enable_sink(struct coresight_device *csdev, u32 mode)
124{
125 int ret;
126
127 if (!csdev->enable) {
128 if (sink_ops(csdev)->enable) {
129 ret = sink_ops(csdev)->enable(csdev, mode);
130 if (ret)
131 return ret;
132 }
133 csdev->enable = true;
134 }
135
136 atomic_inc(csdev->refcnt);
137
138 return 0;
139}
140
141static void coresight_disable_sink(struct coresight_device *csdev)
142{
143 if (atomic_dec_return(csdev->refcnt) == 0) {
144 if (sink_ops(csdev)->disable) {
145 sink_ops(csdev)->disable(csdev);
146 csdev->enable = false;
147 }
148 }
149}
150
151static int coresight_enable_link(struct coresight_device *csdev,
152 struct coresight_device *parent,
153 struct coresight_device *child)
154{
155 int ret;
156 int link_subtype;
157 int refport, inport, outport;
158
159 if (!parent || !child)
160 return -EINVAL;
161
162 inport = coresight_find_link_inport(csdev, parent);
163 outport = coresight_find_link_outport(csdev, child);
164 link_subtype = csdev->subtype.link_subtype;
165
166 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
167 refport = inport;
168 else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
169 refport = outport;
170 else
171 refport = 0;
172
173 if (atomic_inc_return(&csdev->refcnt[refport]) == 1) {
174 if (link_ops(csdev)->enable) {
175 ret = link_ops(csdev)->enable(csdev, inport, outport);
176 if (ret)
177 return ret;
178 }
179 }
180
181 csdev->enable = true;
182
183 return 0;
184}
185
186static void coresight_disable_link(struct coresight_device *csdev,
187 struct coresight_device *parent,
188 struct coresight_device *child)
189{
190 int i, nr_conns;
191 int link_subtype;
192 int refport, inport, outport;
193
194 if (!parent || !child)
195 return;
196
197 inport = coresight_find_link_inport(csdev, parent);
198 outport = coresight_find_link_outport(csdev, child);
199 link_subtype = csdev->subtype.link_subtype;
200
201 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
202 refport = inport;
203 nr_conns = csdev->nr_inport;
204 } else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
205 refport = outport;
206 nr_conns = csdev->nr_outport;
207 } else {
208 refport = 0;
209 nr_conns = 1;
210 }
211
212 if (atomic_dec_return(&csdev->refcnt[refport]) == 0) {
213 if (link_ops(csdev)->disable)
214 link_ops(csdev)->disable(csdev, inport, outport);
215 }
216
217 for (i = 0; i < nr_conns; i++)
218 if (atomic_read(&csdev->refcnt[i]) != 0)
219 return;
220
221 csdev->enable = false;
222}
223
224static int coresight_enable_source(struct coresight_device *csdev, u32 mode)
225{
226 int ret;
227
228 if (!coresight_source_is_unique(csdev)) {
229 dev_warn(&csdev->dev, "traceID %d not unique\n",
230 source_ops(csdev)->trace_id(csdev));
231 return -EINVAL;
232 }
233
234 if (!csdev->enable) {
235 if (source_ops(csdev)->enable) {
236 ret = source_ops(csdev)->enable(csdev, NULL, mode);
237 if (ret)
238 return ret;
239 }
240 csdev->enable = true;
241 }
242
243 atomic_inc(csdev->refcnt);
244
245 return 0;
246}
247
248static void coresight_disable_source(struct coresight_device *csdev)
249{
250 if (atomic_dec_return(csdev->refcnt) == 0) {
251 if (source_ops(csdev)->disable) {
252 source_ops(csdev)->disable(csdev);
253 csdev->enable = false;
254 }
255 }
256}
257
258void coresight_disable_path(struct list_head *path)
259{
260 struct coresight_node *nd;
261 struct coresight_device *csdev, *parent, *child;
262
263 list_for_each_entry(nd, path, link) {
264 csdev = nd->csdev;
265
266 switch (csdev->type) {
267 case CORESIGHT_DEV_TYPE_SINK:
268 case CORESIGHT_DEV_TYPE_LINKSINK:
269 coresight_disable_sink(csdev);
270 break;
271 case CORESIGHT_DEV_TYPE_SOURCE:
272 /* sources are disabled from either sysFS or Perf */
273 break;
274 case CORESIGHT_DEV_TYPE_LINK:
275 parent = list_prev_entry(nd, link)->csdev;
276 child = list_next_entry(nd, link)->csdev;
277 coresight_disable_link(csdev, parent, child);
278 break;
279 default:
280 break;
281 }
282 }
283}
284
285int coresight_enable_path(struct list_head *path, u32 mode)
286{
287
288 int ret = 0;
289 struct coresight_node *nd;
290 struct coresight_device *csdev, *parent, *child;
291
292 list_for_each_entry_reverse(nd, path, link) {
293 csdev = nd->csdev;
294
295 switch (csdev->type) {
296 case CORESIGHT_DEV_TYPE_SINK:
297 case CORESIGHT_DEV_TYPE_LINKSINK:
298 ret = coresight_enable_sink(csdev, mode);
299 if (ret)
300 goto err;
301 break;
302 case CORESIGHT_DEV_TYPE_SOURCE:
303 /* sources are enabled from either sysFS or Perf */
304 break;
305 case CORESIGHT_DEV_TYPE_LINK:
306 parent = list_prev_entry(nd, link)->csdev;
307 child = list_next_entry(nd, link)->csdev;
308 ret = coresight_enable_link(csdev, parent, child);
309 if (ret)
310 goto err;
311 break;
312 default:
313 goto err;
314 }
315 }
316
317out:
318 return ret;
319err:
320 coresight_disable_path(path);
321 goto out;
322}
323
324struct coresight_device *coresight_get_sink(struct list_head *path)
325{
326 struct coresight_device *csdev;
327
328 if (!path)
329 return NULL;
330
331 csdev = list_last_entry(path, struct coresight_node, link)->csdev;
332 if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
333 csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
334 return NULL;
335
336 return csdev;
337}
338
339/**
340 * _coresight_build_path - recursively build a path from a @csdev to a sink.
341 * @csdev: The device to start from.
342 * @path: The list to add devices to.
343 *
344 * The tree of Coresight device is traversed until an activated sink is
345 * found. From there the sink is added to the list along with all the
346 * devices that led to that point - the end result is a list from source
347 * to sink. In that list the source is the first device and the sink the
348 * last one.
349 */
350static int _coresight_build_path(struct coresight_device *csdev,
351 struct list_head *path)
352{
353 int i;
354 bool found = false;
355 struct coresight_node *node;
356 struct coresight_connection *conn;
357
358 /* An activated sink has been found. Enqueue the element */
359 if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
360 csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) && csdev->activated)
361 goto out;
362
363 /* Not a sink - recursively explore each port found on this element */
364 for (i = 0; i < csdev->nr_outport; i++) {
365 conn = &csdev->conns[i];
366 if (_coresight_build_path(conn->child_dev, path) == 0) {
367 found = true;
368 break;
369 }
370 }
371
372 if (!found)
373 return -ENODEV;
374
375out:
376 /*
377 * A path from this element to a sink has been found. The elements
378 * leading to the sink are already enqueued, all that is left to do
379 * is tell the PM runtime core we need this element and add a node
380 * for it.
381 */
382 node = kzalloc(sizeof(struct coresight_node), GFP_KERNEL);
383 if (!node)
384 return -ENOMEM;
385
386 node->csdev = csdev;
387 list_add(&node->link, path);
388 pm_runtime_get_sync(csdev->dev.parent);
389
390 return 0;
391}
392
393struct list_head *coresight_build_path(struct coresight_device *csdev)
394{
395 struct list_head *path;
396
397 path = kzalloc(sizeof(struct list_head), GFP_KERNEL);
398 if (!path)
399 return NULL;
400
401 INIT_LIST_HEAD(path);
402
403 if (_coresight_build_path(csdev, path)) {
404 kfree(path);
405 path = NULL;
406 }
407
408 return path;
409}
410
411/**
412 * coresight_release_path - release a previously built path.
413 * @path: the path to release.
414 *
415 * Go through all the elements of a path and 1) removed it from the list and
416 * 2) free the memory allocated for each node.
417 */
418void coresight_release_path(struct list_head *path)
419{
420 struct coresight_device *csdev;
421 struct coresight_node *nd, *next;
422
423 list_for_each_entry_safe(nd, next, path, link) {
424 csdev = nd->csdev;
425
426 pm_runtime_put_sync(csdev->dev.parent);
427 list_del(&nd->link);
428 kfree(nd);
429 }
430
431 kfree(path);
432 path = NULL;
433}
434
435int coresight_enable(struct coresight_device *csdev)
436{
437 int ret = 0;
438 int cpu;
439 struct list_head *path;
440
441 mutex_lock(&coresight_mutex);
442 if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) {
443 ret = -EINVAL;
444 dev_err(&csdev->dev, "wrong device type in %s\n", __func__);
445 goto out;
446 }
447 if (csdev->enable)
448 goto out;
449
450 path = coresight_build_path(csdev);
451 if (!path) {
452 pr_err("building path(s) failed\n");
453 goto out;
454 }
455
456 ret = coresight_enable_path(path, CS_MODE_SYSFS);
457 if (ret)
458 goto err_path;
459
460 ret = coresight_enable_source(csdev, CS_MODE_SYSFS);
461 if (ret)
462 goto err_source;
463
464 /*
465 * When working from sysFS it is important to keep track
466 * of the paths that were created so that they can be
467 * undone in 'coresight_disable()'. Since there can only
468 * be a single session per tracer (when working from sysFS)
469 * a per-cpu variable will do just fine.
470 */
471 cpu = source_ops(csdev)->cpu_id(csdev);
472 per_cpu(sysfs_path, cpu) = path;
473
474out:
475 mutex_unlock(&coresight_mutex);
476 return ret;
477
478err_source:
479 coresight_disable_path(path);
480
481err_path:
482 coresight_release_path(path);
483 goto out;
484}
485EXPORT_SYMBOL_GPL(coresight_enable);
486
487void coresight_disable(struct coresight_device *csdev)
488{
489 int cpu;
490 struct list_head *path;
491
492 mutex_lock(&coresight_mutex);
493 if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) {
494 dev_err(&csdev->dev, "wrong device type in %s\n", __func__);
495 goto out;
496 }
497 if (!csdev->enable)
498 goto out;
499
500 cpu = source_ops(csdev)->cpu_id(csdev);
501 path = per_cpu(sysfs_path, cpu);
502 coresight_disable_source(csdev);
503 coresight_disable_path(path);
504 coresight_release_path(path);
505 per_cpu(sysfs_path, cpu) = NULL;
506
507out:
508 mutex_unlock(&coresight_mutex);
509}
510EXPORT_SYMBOL_GPL(coresight_disable);
511
512static ssize_t enable_sink_show(struct device *dev,
513 struct device_attribute *attr, char *buf)
514{
515 struct coresight_device *csdev = to_coresight_device(dev);
516
517 return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned)csdev->activated);
518}
519
520static ssize_t enable_sink_store(struct device *dev,
521 struct device_attribute *attr,
522 const char *buf, size_t size)
523{
524 int ret;
525 unsigned long val;
526 struct coresight_device *csdev = to_coresight_device(dev);
527
528 ret = kstrtoul(buf, 10, &val);
529 if (ret)
530 return ret;
531
532 if (val)
533 csdev->activated = true;
534 else
535 csdev->activated = false;
536
537 return size;
538
539}
540static DEVICE_ATTR_RW(enable_sink);
541
542static ssize_t enable_source_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
544{
545 struct coresight_device *csdev = to_coresight_device(dev);
546
547 return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned)csdev->enable);
548}
549
550static ssize_t enable_source_store(struct device *dev,
551 struct device_attribute *attr,
552 const char *buf, size_t size)
553{
554 int ret = 0;
555 unsigned long val;
556 struct coresight_device *csdev = to_coresight_device(dev);
557
558 ret = kstrtoul(buf, 10, &val);
559 if (ret)
560 return ret;
561
562 if (val) {
563 ret = coresight_enable(csdev);
564 if (ret)
565 return ret;
566 } else {
567 coresight_disable(csdev);
568 }
569
570 return size;
571}
572static DEVICE_ATTR_RW(enable_source);
573
574static struct attribute *coresight_sink_attrs[] = {
575 &dev_attr_enable_sink.attr,
576 NULL,
577};
578ATTRIBUTE_GROUPS(coresight_sink);
579
580static struct attribute *coresight_source_attrs[] = {
581 &dev_attr_enable_source.attr,
582 NULL,
583};
584ATTRIBUTE_GROUPS(coresight_source);
585
586static struct device_type coresight_dev_type[] = {
587 {
588 .name = "none",
589 },
590 {
591 .name = "sink",
592 .groups = coresight_sink_groups,
593 },
594 {
595 .name = "link",
596 },
597 {
598 .name = "linksink",
599 .groups = coresight_sink_groups,
600 },
601 {
602 .name = "source",
603 .groups = coresight_source_groups,
604 },
605};
606
607static void coresight_device_release(struct device *dev)
608{
609 struct coresight_device *csdev = to_coresight_device(dev);
610
611 kfree(csdev->conns);
612 kfree(csdev->refcnt);
613 kfree(csdev);
614}
615
616static int coresight_orphan_match(struct device *dev, void *data)
617{
618 int i;
619 bool still_orphan = false;
620 struct coresight_device *csdev, *i_csdev;
621 struct coresight_connection *conn;
622
623 csdev = data;
624 i_csdev = to_coresight_device(dev);
625
626 /* No need to check oneself */
627 if (csdev == i_csdev)
628 return 0;
629
630 /* Move on to another component if no connection is orphan */
631 if (!i_csdev->orphan)
632 return 0;
633 /*
634 * Circle throuch all the connection of that component. If we find
635 * an orphan connection whose name matches @csdev, link it.
636 */
637 for (i = 0; i < i_csdev->nr_outport; i++) {
638 conn = &i_csdev->conns[i];
639
640 /* We have found at least one orphan connection */
641 if (conn->child_dev == NULL) {
642 /* Does it match this newly added device? */
643 if (!strcmp(dev_name(&csdev->dev), conn->child_name)) {
644 conn->child_dev = csdev;
645 } else {
646 /* This component still has an orphan */
647 still_orphan = true;
648 }
649 }
650 }
651
652 i_csdev->orphan = still_orphan;
653
654 /*
655 * Returning '0' ensures that all known component on the
656 * bus will be checked.
657 */
658 return 0;
659}
660
661static void coresight_fixup_orphan_conns(struct coresight_device *csdev)
662{
663 /*
664 * No need to check for a return value as orphan connection(s)
665 * are hooked-up with each newly added component.
666 */
667 bus_for_each_dev(&coresight_bustype, NULL,
668 csdev, coresight_orphan_match);
669}
670
671
672static int coresight_name_match(struct device *dev, void *data)
673{
674 char *to_match;
675 struct coresight_device *i_csdev;
676
677 to_match = data;
678 i_csdev = to_coresight_device(dev);
679
680 if (to_match && !strcmp(to_match, dev_name(&i_csdev->dev)))
681 return 1;
682
683 return 0;
684}
685
686static void coresight_fixup_device_conns(struct coresight_device *csdev)
687{
688 int i;
689 struct device *dev = NULL;
690 struct coresight_connection *conn;
691
692 for (i = 0; i < csdev->nr_outport; i++) {
693 conn = &csdev->conns[i];
694 dev = bus_find_device(&coresight_bustype, NULL,
695 (void *)conn->child_name,
696 coresight_name_match);
697
698 if (dev) {
699 conn->child_dev = to_coresight_device(dev);
700 /* and put reference from 'bus_find_device()' */
701 put_device(dev);
702 } else {
703 csdev->orphan = true;
704 conn->child_dev = NULL;
705 }
706 }
707}
708
709static int coresight_remove_match(struct device *dev, void *data)
710{
711 int i;
712 struct coresight_device *csdev, *iterator;
713 struct coresight_connection *conn;
714
715 csdev = data;
716 iterator = to_coresight_device(dev);
717
718 /* No need to check oneself */
719 if (csdev == iterator)
720 return 0;
721
722 /*
723 * Circle throuch all the connection of that component. If we find
724 * a connection whose name matches @csdev, remove it.
725 */
726 for (i = 0; i < iterator->nr_outport; i++) {
727 conn = &iterator->conns[i];
728
729 if (conn->child_dev == NULL)
730 continue;
731
732 if (!strcmp(dev_name(&csdev->dev), conn->child_name)) {
733 iterator->orphan = true;
734 conn->child_dev = NULL;
735 /* No need to continue */
736 break;
737 }
738 }
739
740 /*
741 * Returning '0' ensures that all known component on the
742 * bus will be checked.
743 */
744 return 0;
745}
746
747static void coresight_remove_conns(struct coresight_device *csdev)
748{
749 bus_for_each_dev(&coresight_bustype, NULL,
750 csdev, coresight_remove_match);
751}
752
753/**
754 * coresight_timeout - loop until a bit has changed to a specific state.
755 * @addr: base address of the area of interest.
756 * @offset: address of a register, starting from @addr.
757 * @position: the position of the bit of interest.
758 * @value: the value the bit should have.
759 *
760 * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
761 * TIMEOUT_US has elapsed, which ever happens first.
762 */
763
764int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
765{
766 int i;
767 u32 val;
768
769 for (i = TIMEOUT_US; i > 0; i--) {
770 val = __raw_readl(addr + offset);
771 /* waiting on the bit to go from 0 to 1 */
772 if (value) {
773 if (val & BIT(position))
774 return 0;
775 /* waiting on the bit to go from 1 to 0 */
776 } else {
777 if (!(val & BIT(position)))
778 return 0;
779 }
780
781 /*
782 * Delay is arbitrary - the specification doesn't say how long
783 * we are expected to wait. Extra check required to make sure
784 * we don't wait needlessly on the last iteration.
785 */
786 if (i - 1)
787 udelay(1);
788 }
789
790 return -EAGAIN;
791}
792
793struct bus_type coresight_bustype = {
794 .name = "coresight",
795};
796
797static int __init coresight_init(void)
798{
799 return bus_register(&coresight_bustype);
800}
801postcore_initcall(coresight_init);
802
803struct coresight_device *coresight_register(struct coresight_desc *desc)
804{
805 int i;
806 int ret;
807 int link_subtype;
808 int nr_refcnts = 1;
809 atomic_t *refcnts = NULL;
810 struct coresight_device *csdev;
811 struct coresight_connection *conns;
812
813 csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
814 if (!csdev) {
815 ret = -ENOMEM;
816 goto err_kzalloc_csdev;
817 }
818
819 if (desc->type == CORESIGHT_DEV_TYPE_LINK ||
820 desc->type == CORESIGHT_DEV_TYPE_LINKSINK) {
821 link_subtype = desc->subtype.link_subtype;
822
823 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
824 nr_refcnts = desc->pdata->nr_inport;
825 else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
826 nr_refcnts = desc->pdata->nr_outport;
827 }
828
829 refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
830 if (!refcnts) {
831 ret = -ENOMEM;
832 goto err_kzalloc_refcnts;
833 }
834
835 csdev->refcnt = refcnts;
836
837 csdev->nr_inport = desc->pdata->nr_inport;
838 csdev->nr_outport = desc->pdata->nr_outport;
839 conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
840 if (!conns) {
841 ret = -ENOMEM;
842 goto err_kzalloc_conns;
843 }
844
845 for (i = 0; i < csdev->nr_outport; i++) {
846 conns[i].outport = desc->pdata->outports[i];
847 conns[i].child_name = desc->pdata->child_names[i];
848 conns[i].child_port = desc->pdata->child_ports[i];
849 }
850
851 csdev->conns = conns;
852
853 csdev->type = desc->type;
854 csdev->subtype = desc->subtype;
855 csdev->ops = desc->ops;
856 csdev->orphan = false;
857
858 csdev->dev.type = &coresight_dev_type[desc->type];
859 csdev->dev.groups = desc->groups;
860 csdev->dev.parent = desc->dev;
861 csdev->dev.release = coresight_device_release;
862 csdev->dev.bus = &coresight_bustype;
863 dev_set_name(&csdev->dev, "%s", desc->pdata->name);
864
865 ret = device_register(&csdev->dev);
866 if (ret)
867 goto err_device_register;
868
869 mutex_lock(&coresight_mutex);
870
871 coresight_fixup_device_conns(csdev);
872 coresight_fixup_orphan_conns(csdev);
873
874 mutex_unlock(&coresight_mutex);
875
876 return csdev;
877
878err_device_register:
879 kfree(conns);
880err_kzalloc_conns:
881 kfree(refcnts);
882err_kzalloc_refcnts:
883 kfree(csdev);
884err_kzalloc_csdev:
885 return ERR_PTR(ret);
886}
887EXPORT_SYMBOL_GPL(coresight_register);
888
889void coresight_unregister(struct coresight_device *csdev)
890{
891 /* Remove references of that device in the topology */
892 coresight_remove_conns(csdev);
893 device_unregister(&csdev->dev);
894}
895EXPORT_SYMBOL_GPL(coresight_unregister);