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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2012, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/acpi.h>
7#include <linux/types.h>
8#include <linux/err.h>
9#include <linux/slab.h>
10#include <linux/clk.h>
11#include <linux/of.h>
12#include <linux/of_address.h>
13#include <linux/of_graph.h>
14#include <linux/of_platform.h>
15#include <linux/platform_device.h>
16#include <linux/amba/bus.h>
17#include <linux/coresight.h>
18#include <linux/cpumask.h>
19#include <asm/smp_plat.h>
20
21#include "coresight-priv.h"
22/*
23 * coresight_alloc_conns: Allocate connections record for each output
24 * port from the device.
25 */
26static int coresight_alloc_conns(struct device *dev,
27 struct coresight_platform_data *pdata)
28{
29 if (pdata->nr_outport) {
30 pdata->conns = devm_kzalloc(dev, pdata->nr_outport *
31 sizeof(*pdata->conns),
32 GFP_KERNEL);
33 if (!pdata->conns)
34 return -ENOMEM;
35 }
36
37 return 0;
38}
39
40static struct device *
41coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
42{
43 struct device *dev = NULL;
44
45 /*
46 * If we have a non-configurable replicator, it will be found on the
47 * platform bus.
48 */
49 dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
50 if (dev)
51 return dev;
52
53 /*
54 * We have a configurable component - circle through the AMBA bus
55 * looking for the device that matches the endpoint node.
56 */
57 return bus_find_device_by_fwnode(&amba_bustype, fwnode);
58}
59
60#ifdef CONFIG_OF
61static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
62{
63 return of_property_read_bool(ep, "slave-mode");
64}
65
66static void of_coresight_get_ports_legacy(const struct device_node *node,
67 int *nr_inport, int *nr_outport)
68{
69 struct device_node *ep = NULL;
70 int in = 0, out = 0;
71
72 do {
73 ep = of_graph_get_next_endpoint(node, ep);
74 if (!ep)
75 break;
76
77 if (of_coresight_legacy_ep_is_input(ep))
78 in++;
79 else
80 out++;
81
82 } while (ep);
83
84 *nr_inport = in;
85 *nr_outport = out;
86}
87
88static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
89{
90 struct device_node *parent = of_graph_get_port_parent(ep);
91
92 /*
93 * Skip one-level up to the real device node, if we
94 * are using the new bindings.
95 */
96 if (of_node_name_eq(parent, "in-ports") ||
97 of_node_name_eq(parent, "out-ports"))
98 parent = of_get_next_parent(parent);
99
100 return parent;
101}
102
103static inline struct device_node *
104of_coresight_get_input_ports_node(const struct device_node *node)
105{
106 return of_get_child_by_name(node, "in-ports");
107}
108
109static inline struct device_node *
110of_coresight_get_output_ports_node(const struct device_node *node)
111{
112 return of_get_child_by_name(node, "out-ports");
113}
114
115static inline int
116of_coresight_count_ports(struct device_node *port_parent)
117{
118 int i = 0;
119 struct device_node *ep = NULL;
120
121 while ((ep = of_graph_get_next_endpoint(port_parent, ep)))
122 i++;
123 return i;
124}
125
126static void of_coresight_get_ports(const struct device_node *node,
127 int *nr_inport, int *nr_outport)
128{
129 struct device_node *input_ports = NULL, *output_ports = NULL;
130
131 input_ports = of_coresight_get_input_ports_node(node);
132 output_ports = of_coresight_get_output_ports_node(node);
133
134 if (input_ports || output_ports) {
135 if (input_ports) {
136 *nr_inport = of_coresight_count_ports(input_ports);
137 of_node_put(input_ports);
138 }
139 if (output_ports) {
140 *nr_outport = of_coresight_count_ports(output_ports);
141 of_node_put(output_ports);
142 }
143 } else {
144 /* Fall back to legacy DT bindings parsing */
145 of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
146 }
147}
148
149static int of_coresight_get_cpu(struct device *dev)
150{
151 int cpu;
152 struct device_node *dn;
153
154 if (!dev->of_node)
155 return -ENODEV;
156
157 dn = of_parse_phandle(dev->of_node, "cpu", 0);
158 if (!dn)
159 return -ENODEV;
160
161 cpu = of_cpu_node_to_id(dn);
162 of_node_put(dn);
163
164 return cpu;
165}
166
167/*
168 * of_coresight_parse_endpoint : Parse the given output endpoint @ep
169 * and fill the connection information in @conn
170 *
171 * Parses the local port, remote device name and the remote port.
172 *
173 * Returns :
174 * 1 - If the parsing is successful and a connection record
175 * was created for an output connection.
176 * 0 - If the parsing completed without any fatal errors.
177 * -Errno - Fatal error, abort the scanning.
178 */
179static int of_coresight_parse_endpoint(struct device *dev,
180 struct device_node *ep,
181 struct coresight_connection *conn)
182{
183 int ret = 0;
184 struct of_endpoint endpoint, rendpoint;
185 struct device_node *rparent = NULL;
186 struct device_node *rep = NULL;
187 struct device *rdev = NULL;
188 struct fwnode_handle *rdev_fwnode;
189
190 do {
191 /* Parse the local port details */
192 if (of_graph_parse_endpoint(ep, &endpoint))
193 break;
194 /*
195 * Get a handle on the remote endpoint and the device it is
196 * attached to.
197 */
198 rep = of_graph_get_remote_endpoint(ep);
199 if (!rep)
200 break;
201 rparent = of_coresight_get_port_parent(rep);
202 if (!rparent)
203 break;
204 if (of_graph_parse_endpoint(rep, &rendpoint))
205 break;
206
207 rdev_fwnode = of_fwnode_handle(rparent);
208 /* If the remote device is not available, defer probing */
209 rdev = coresight_find_device_by_fwnode(rdev_fwnode);
210 if (!rdev) {
211 ret = -EPROBE_DEFER;
212 break;
213 }
214
215 conn->outport = endpoint.port;
216 /*
217 * Hold the refcount to the target device. This could be
218 * released via:
219 * 1) coresight_release_platform_data() if the probe fails or
220 * this device is unregistered.
221 * 2) While removing the target device via
222 * coresight_remove_match()
223 */
224 conn->child_fwnode = fwnode_handle_get(rdev_fwnode);
225 conn->child_port = rendpoint.port;
226 /* Connection record updated */
227 ret = 1;
228 } while (0);
229
230 of_node_put(rparent);
231 of_node_put(rep);
232 put_device(rdev);
233
234 return ret;
235}
236
237static int of_get_coresight_platform_data(struct device *dev,
238 struct coresight_platform_data *pdata)
239{
240 int ret = 0;
241 struct coresight_connection *conn;
242 struct device_node *ep = NULL;
243 const struct device_node *parent = NULL;
244 bool legacy_binding = false;
245 struct device_node *node = dev->of_node;
246
247 /* Get the number of input and output port for this component */
248 of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
249
250 /* If there are no output connections, we are done */
251 if (!pdata->nr_outport)
252 return 0;
253
254 ret = coresight_alloc_conns(dev, pdata);
255 if (ret)
256 return ret;
257
258 parent = of_coresight_get_output_ports_node(node);
259 /*
260 * If the DT uses obsoleted bindings, the ports are listed
261 * under the device and we need to filter out the input
262 * ports.
263 */
264 if (!parent) {
265 legacy_binding = true;
266 parent = node;
267 dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
268 }
269
270 conn = pdata->conns;
271
272 /* Iterate through each output port to discover topology */
273 while ((ep = of_graph_get_next_endpoint(parent, ep))) {
274 /*
275 * Legacy binding mixes input/output ports under the
276 * same parent. So, skip the input ports if we are dealing
277 * with legacy binding, as they processed with their
278 * connected output ports.
279 */
280 if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
281 continue;
282
283 ret = of_coresight_parse_endpoint(dev, ep, conn);
284 switch (ret) {
285 case 1:
286 conn++; /* Fall through */
287 case 0:
288 break;
289 default:
290 return ret;
291 }
292 }
293
294 return 0;
295}
296#else
297static inline int
298of_get_coresight_platform_data(struct device *dev,
299 struct coresight_platform_data *pdata)
300{
301 return -ENOENT;
302}
303
304static inline int of_coresight_get_cpu(struct device *dev)
305{
306 return -ENODEV;
307}
308#endif
309
310#ifdef CONFIG_ACPI
311
312#include <acpi/actypes.h>
313#include <acpi/processor.h>
314
315/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
316static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
317 0xbd, 0x68, 0xf7, 0xd3,
318 0x44, 0xef, 0x21, 0x53);
319/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
320static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
321 0x81, 0x07, 0xe6, 0x27,
322 0xf8, 0x05, 0xc6, 0xcd);
323#define ACPI_CORESIGHT_LINK_SLAVE 0
324#define ACPI_CORESIGHT_LINK_MASTER 1
325
326static inline bool is_acpi_guid(const union acpi_object *obj)
327{
328 return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
329}
330
331/*
332 * acpi_guid_matches - Checks if the given object is a GUID object and
333 * that it matches the supplied the GUID.
334 */
335static inline bool acpi_guid_matches(const union acpi_object *obj,
336 const guid_t *guid)
337{
338 return is_acpi_guid(obj) &&
339 guid_equal((guid_t *)obj->buffer.pointer, guid);
340}
341
342static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
343{
344 return acpi_guid_matches(obj, &acpi_graph_uuid);
345}
346
347static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
348{
349 return acpi_guid_matches(obj, &coresight_graph_uuid);
350}
351
352static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
353{
354 const union acpi_object *graphid, *guid, *links;
355
356 if (obj->type != ACPI_TYPE_PACKAGE ||
357 obj->package.count < 3)
358 return false;
359
360 graphid = &obj->package.elements[0];
361 guid = &obj->package.elements[1];
362 links = &obj->package.elements[2];
363
364 if (graphid->type != ACPI_TYPE_INTEGER ||
365 links->type != ACPI_TYPE_INTEGER)
366 return false;
367
368 return is_acpi_coresight_graph_guid(guid);
369}
370
371/*
372 * acpi_validate_dsd_graph - Make sure the given _DSD graph conforms
373 * to the ACPI _DSD Graph specification.
374 *
375 * ACPI Devices Graph property has the following format:
376 * {
377 * Revision - Integer, must be 0
378 * NumberOfGraphs - Integer, N indicating the following list.
379 * Graph[1],
380 * ...
381 * Graph[N]
382 * }
383 *
384 * And each Graph entry has the following format:
385 * {
386 * GraphID - Integer, identifying a graph the device belongs to.
387 * UUID - UUID identifying the specification that governs
388 * this graph. (e.g, see is_acpi_coresight_graph())
389 * NumberOfLinks - Number "N" of connections on this node of the graph.
390 * Links[1]
391 * ...
392 * Links[N]
393 * }
394 *
395 * Where each "Links" entry has the following format:
396 *
397 * {
398 * SourcePortAddress - Integer
399 * DestinationPortAddress - Integer
400 * DestinationDeviceName - Reference to another device
401 * ( --- CoreSight specific extensions below ---)
402 * DirectionOfFlow - Integer 1 for output(master)
403 * 0 for input(slave)
404 * }
405 *
406 * e.g:
407 * For a Funnel device
408 *
409 * Device(MFUN) {
410 * ...
411 *
412 * Name (_DSD, Package() {
413 * // DSD Package contains tuples of { Proeprty_Type_UUID, Package() }
414 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
415 * Package() {
416 * Package(2) { "property-name", <property-value> }
417 * },
418 *
419 * ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
420 * Package() {
421 * 0, // Revision
422 * 1, // NumberOfGraphs.
423 * Package() { // Graph[0] Package
424 * 1, // GraphID
425 * // Coresight Graph UUID
426 * ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
427 * 3, // NumberOfLinks aka ports
428 * // Link[0]: Output_0 -> Replicator:Input_0
429 * Package () { 0, 0, \_SB_.RPL0, 1 },
430 * // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
431 * Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
432 * // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
433 * Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
434 * } // End of Graph[0] Package
435 *
436 * }, // End of ACPI Graph Property
437 * })
438 */
439static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
440{
441 int i, n;
442 const union acpi_object *rev, *nr_graphs;
443
444 /* The graph must contain at least the Revision and Number of Graphs */
445 if (graph->package.count < 2)
446 return false;
447
448 rev = &graph->package.elements[0];
449 nr_graphs = &graph->package.elements[1];
450
451 if (rev->type != ACPI_TYPE_INTEGER ||
452 nr_graphs->type != ACPI_TYPE_INTEGER)
453 return false;
454
455 /* We only support revision 0 */
456 if (rev->integer.value != 0)
457 return false;
458
459 n = nr_graphs->integer.value;
460 /* CoreSight devices are only part of a single Graph */
461 if (n != 1)
462 return false;
463
464 /* Make sure the ACPI graph package has right number of elements */
465 if (graph->package.count != (n + 2))
466 return false;
467
468 /*
469 * Each entry must be a graph package with at least 3 members :
470 * { GraphID, UUID, NumberOfLinks(n), Links[.],... }
471 */
472 for (i = 2; i < n + 2; i++) {
473 const union acpi_object *obj = &graph->package.elements[i];
474
475 if (obj->type != ACPI_TYPE_PACKAGE ||
476 obj->package.count < 3)
477 return false;
478 }
479
480 return true;
481}
482
483/* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */
484const union acpi_object *
485acpi_get_dsd_graph(struct acpi_device *adev)
486{
487 int i;
488 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
489 acpi_status status;
490 const union acpi_object *dsd;
491
492 status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
493 &buf, ACPI_TYPE_PACKAGE);
494 if (ACPI_FAILURE(status))
495 return NULL;
496
497 dsd = buf.pointer;
498
499 /*
500 * _DSD property consists tuples { Prop_UUID, Package() }
501 * Iterate through all the packages and find the Graph.
502 */
503 for (i = 0; i + 1 < dsd->package.count; i += 2) {
504 const union acpi_object *guid, *package;
505
506 guid = &dsd->package.elements[i];
507 package = &dsd->package.elements[i + 1];
508
509 /* All _DSD elements must have a UUID and a Package */
510 if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
511 break;
512 /* Skip the non-Graph _DSD packages */
513 if (!is_acpi_dsd_graph_guid(guid))
514 continue;
515 if (acpi_validate_dsd_graph(package))
516 return package;
517 /* Invalid graph format, continue */
518 dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
519 }
520
521 return NULL;
522}
523
524static inline bool
525acpi_validate_coresight_graph(const union acpi_object *cs_graph)
526{
527 int nlinks;
528
529 nlinks = cs_graph->package.elements[2].integer.value;
530 /*
531 * Graph must have the following fields :
532 * { GraphID, GraphUUID, NumberOfLinks, Links... }
533 */
534 if (cs_graph->package.count != (nlinks + 3))
535 return false;
536 /* The links are validated in acpi_coresight_parse_link() */
537 return true;
538}
539
540/*
541 * acpi_get_coresight_graph - Parse the device _DSD tables and find
542 * the Graph property matching the CoreSight Graphs.
543 *
544 * Returns the pointer to the CoreSight Graph Package when found. Otherwise
545 * returns NULL.
546 */
547const union acpi_object *
548acpi_get_coresight_graph(struct acpi_device *adev)
549{
550 const union acpi_object *graph_list, *graph;
551 int i, nr_graphs;
552
553 graph_list = acpi_get_dsd_graph(adev);
554 if (!graph_list)
555 return graph_list;
556
557 nr_graphs = graph_list->package.elements[1].integer.value;
558
559 for (i = 2; i < nr_graphs + 2; i++) {
560 graph = &graph_list->package.elements[i];
561 if (!is_acpi_coresight_graph(graph))
562 continue;
563 if (acpi_validate_coresight_graph(graph))
564 return graph;
565 /* Invalid graph format */
566 break;
567 }
568
569 return NULL;
570}
571
572/*
573 * acpi_coresight_parse_link - Parse the given Graph connection
574 * of the device and populate the coresight_connection for an output
575 * connection.
576 *
577 * CoreSight Graph specification mandates that the direction of the data
578 * flow must be specified in the link. i.e,
579 *
580 * SourcePortAddress, // Integer
581 * DestinationPortAddress, // Integer
582 * DestinationDeviceName, // Reference to another device
583 * DirectionOfFlow, // 1 for output(master), 0 for input(slave)
584 *
585 * Returns the direction of the data flow [ Input(slave) or Output(master) ]
586 * upon success.
587 * Returns an negative error number otherwise.
588 */
589static int acpi_coresight_parse_link(struct acpi_device *adev,
590 const union acpi_object *link,
591 struct coresight_connection *conn)
592{
593 int rc, dir;
594 const union acpi_object *fields;
595 struct acpi_device *r_adev;
596 struct device *rdev;
597
598 if (link->type != ACPI_TYPE_PACKAGE ||
599 link->package.count != 4)
600 return -EINVAL;
601
602 fields = link->package.elements;
603
604 if (fields[0].type != ACPI_TYPE_INTEGER ||
605 fields[1].type != ACPI_TYPE_INTEGER ||
606 fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
607 fields[3].type != ACPI_TYPE_INTEGER)
608 return -EINVAL;
609
610 rc = acpi_bus_get_device(fields[2].reference.handle, &r_adev);
611 if (rc)
612 return rc;
613
614 dir = fields[3].integer.value;
615 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
616 conn->outport = fields[0].integer.value;
617 conn->child_port = fields[1].integer.value;
618 rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
619 if (!rdev)
620 return -EPROBE_DEFER;
621 /*
622 * Hold the refcount to the target device. This could be
623 * released via:
624 * 1) coresight_release_platform_data() if the probe fails or
625 * this device is unregistered.
626 * 2) While removing the target device via
627 * coresight_remove_match().
628 */
629 conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode);
630 }
631
632 return dir;
633}
634
635/*
636 * acpi_coresight_parse_graph - Parse the _DSD CoreSight graph
637 * connection information and populate the supplied coresight_platform_data
638 * instance.
639 */
640static int acpi_coresight_parse_graph(struct acpi_device *adev,
641 struct coresight_platform_data *pdata)
642{
643 int rc, i, nlinks;
644 const union acpi_object *graph;
645 struct coresight_connection *conns, *ptr;
646
647 pdata->nr_inport = pdata->nr_outport = 0;
648 graph = acpi_get_coresight_graph(adev);
649 if (!graph)
650 return -ENOENT;
651
652 nlinks = graph->package.elements[2].integer.value;
653 if (!nlinks)
654 return 0;
655
656 /*
657 * To avoid scanning the table twice (once for finding the number of
658 * output links and then later for parsing the output links),
659 * cache the links information in one go and then later copy
660 * it to the pdata.
661 */
662 conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL);
663 if (!conns)
664 return -ENOMEM;
665 ptr = conns;
666 for (i = 0; i < nlinks; i++) {
667 const union acpi_object *link = &graph->package.elements[3 + i];
668 int dir;
669
670 dir = acpi_coresight_parse_link(adev, link, ptr);
671 if (dir < 0)
672 return dir;
673
674 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
675 pdata->nr_outport++;
676 ptr++;
677 } else {
678 pdata->nr_inport++;
679 }
680 }
681
682 rc = coresight_alloc_conns(&adev->dev, pdata);
683 if (rc)
684 return rc;
685
686 /* Copy the connection information to the final location */
687 for (i = 0; i < pdata->nr_outport; i++)
688 pdata->conns[i] = conns[i];
689
690 devm_kfree(&adev->dev, conns);
691 return 0;
692}
693
694/*
695 * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
696 * logical CPU id of the corresponding CPU device.
697 *
698 * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
699 */
700static int
701acpi_handle_to_logical_cpuid(acpi_handle handle)
702{
703 int i;
704 struct acpi_processor *pr;
705
706 for_each_possible_cpu(i) {
707 pr = per_cpu(processors, i);
708 if (pr && pr->handle == handle)
709 break;
710 }
711
712 return i;
713}
714
715/*
716 * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
717 * with this coresight device. With ACPI bindings, the CoreSight components
718 * are listed as child device of the associated CPU.
719 *
720 * Returns the logical CPU id when found. Otherwise returns 0.
721 */
722static int acpi_coresight_get_cpu(struct device *dev)
723{
724 int cpu;
725 acpi_handle cpu_handle;
726 acpi_status status;
727 struct acpi_device *adev = ACPI_COMPANION(dev);
728
729 if (!adev)
730 return -ENODEV;
731 status = acpi_get_parent(adev->handle, &cpu_handle);
732 if (ACPI_FAILURE(status))
733 return -ENODEV;
734
735 cpu = acpi_handle_to_logical_cpuid(cpu_handle);
736 if (cpu >= nr_cpu_ids)
737 return -ENODEV;
738 return cpu;
739}
740
741static int
742acpi_get_coresight_platform_data(struct device *dev,
743 struct coresight_platform_data *pdata)
744{
745 struct acpi_device *adev;
746
747 adev = ACPI_COMPANION(dev);
748 if (!adev)
749 return -EINVAL;
750
751 return acpi_coresight_parse_graph(adev, pdata);
752}
753
754#else
755
756static inline int
757acpi_get_coresight_platform_data(struct device *dev,
758 struct coresight_platform_data *pdata)
759{
760 return -ENOENT;
761}
762
763static inline int acpi_coresight_get_cpu(struct device *dev)
764{
765 return -ENODEV;
766}
767#endif
768
769int coresight_get_cpu(struct device *dev)
770{
771 if (is_of_node(dev->fwnode))
772 return of_coresight_get_cpu(dev);
773 else if (is_acpi_device_node(dev->fwnode))
774 return acpi_coresight_get_cpu(dev);
775 return 0;
776}
777EXPORT_SYMBOL_GPL(coresight_get_cpu);
778
779struct coresight_platform_data *
780coresight_get_platform_data(struct device *dev)
781{
782 int ret = -ENOENT;
783 struct coresight_platform_data *pdata = NULL;
784 struct fwnode_handle *fwnode = dev_fwnode(dev);
785
786 if (IS_ERR_OR_NULL(fwnode))
787 goto error;
788
789 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
790 if (!pdata) {
791 ret = -ENOMEM;
792 goto error;
793 }
794
795 if (is_of_node(fwnode))
796 ret = of_get_coresight_platform_data(dev, pdata);
797 else if (is_acpi_device_node(fwnode))
798 ret = acpi_get_coresight_platform_data(dev, pdata);
799
800 if (!ret)
801 return pdata;
802error:
803 if (!IS_ERR_OR_NULL(pdata))
804 /* Cleanup the connection information */
805 coresight_release_platform_data(pdata);
806 return ERR_PTR(ret);
807}
808EXPORT_SYMBOL_GPL(coresight_get_platform_data);