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  */
26 static int coresight_alloc_conns(struct device *dev,
27 				 struct coresight_platform_data *pdata)
28 {
29 	if (pdata->nr_outport) {
30 		pdata->conns = devm_kcalloc(dev, pdata->nr_outport,
31 					    sizeof(*pdata->conns), GFP_KERNEL);
32 		if (!pdata->conns)
33 			return -ENOMEM;
34 	}
35 
36 	return 0;
37 }
38 
39 static struct device *
40 coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
41 {
42 	struct device *dev = NULL;
43 
44 	/*
45 	 * If we have a non-configurable replicator, it will be found on the
46 	 * platform bus.
47 	 */
48 	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
49 	if (dev)
50 		return dev;
51 
52 	/*
53 	 * We have a configurable component - circle through the AMBA bus
54 	 * looking for the device that matches the endpoint node.
55 	 */
56 	return bus_find_device_by_fwnode(&amba_bustype, fwnode);
57 }
58 
59 /*
60  * Find a registered coresight device from a device fwnode.
61  * The node info is associated with the AMBA parent, but the
62  * csdev keeps a copy so iterate round the coresight bus to
63  * find the device.
64  */
65 struct coresight_device *
66 coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode)
67 {
68 	struct device *dev;
69 	struct coresight_device *csdev = NULL;
70 
71 	dev = bus_find_device_by_fwnode(&coresight_bustype, r_fwnode);
72 	if (dev) {
73 		csdev = to_coresight_device(dev);
74 		put_device(dev);
75 	}
76 	return csdev;
77 }
78 
79 #ifdef CONFIG_OF
80 static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
81 {
82 	return of_property_read_bool(ep, "slave-mode");
83 }
84 
85 static void of_coresight_get_ports_legacy(const struct device_node *node,
86 					  int *nr_inport, int *nr_outport)
87 {
88 	struct device_node *ep = NULL;
89 	struct of_endpoint endpoint;
90 	int in = 0, out = 0;
91 
92 	do {
93 		ep = of_graph_get_next_endpoint(node, ep);
94 		if (!ep)
95 			break;
96 
97 		if (of_graph_parse_endpoint(ep, &endpoint))
98 			continue;
99 
100 		if (of_coresight_legacy_ep_is_input(ep)) {
101 			in = (endpoint.port + 1 > in) ?
102 				endpoint.port + 1 : in;
103 		} else {
104 			out = (endpoint.port + 1) > out ?
105 				endpoint.port + 1 : out;
106 		}
107 
108 	} while (ep);
109 
110 	*nr_inport = in;
111 	*nr_outport = out;
112 }
113 
114 static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
115 {
116 	struct device_node *parent = of_graph_get_port_parent(ep);
117 
118 	/*
119 	 * Skip one-level up to the real device node, if we
120 	 * are using the new bindings.
121 	 */
122 	if (of_node_name_eq(parent, "in-ports") ||
123 	    of_node_name_eq(parent, "out-ports"))
124 		parent = of_get_next_parent(parent);
125 
126 	return parent;
127 }
128 
129 static inline struct device_node *
130 of_coresight_get_input_ports_node(const struct device_node *node)
131 {
132 	return of_get_child_by_name(node, "in-ports");
133 }
134 
135 static inline struct device_node *
136 of_coresight_get_output_ports_node(const struct device_node *node)
137 {
138 	return of_get_child_by_name(node, "out-ports");
139 }
140 
141 static inline int
142 of_coresight_count_ports(struct device_node *port_parent)
143 {
144 	int i = 0;
145 	struct device_node *ep = NULL;
146 	struct of_endpoint endpoint;
147 
148 	while ((ep = of_graph_get_next_endpoint(port_parent, ep))) {
149 		/* Defer error handling to parsing */
150 		if (of_graph_parse_endpoint(ep, &endpoint))
151 			continue;
152 		if (endpoint.port + 1 > i)
153 			i = endpoint.port + 1;
154 	}
155 
156 	return i;
157 }
158 
159 static void of_coresight_get_ports(const struct device_node *node,
160 				   int *nr_inport, int *nr_outport)
161 {
162 	struct device_node *input_ports = NULL, *output_ports = NULL;
163 
164 	input_ports = of_coresight_get_input_ports_node(node);
165 	output_ports = of_coresight_get_output_ports_node(node);
166 
167 	if (input_ports || output_ports) {
168 		if (input_ports) {
169 			*nr_inport = of_coresight_count_ports(input_ports);
170 			of_node_put(input_ports);
171 		}
172 		if (output_ports) {
173 			*nr_outport = of_coresight_count_ports(output_ports);
174 			of_node_put(output_ports);
175 		}
176 	} else {
177 		/* Fall back to legacy DT bindings parsing */
178 		of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
179 	}
180 }
181 
182 static int of_coresight_get_cpu(struct device *dev)
183 {
184 	int cpu;
185 	struct device_node *dn;
186 
187 	if (!dev->of_node)
188 		return -ENODEV;
189 
190 	dn = of_parse_phandle(dev->of_node, "cpu", 0);
191 	if (!dn)
192 		return -ENODEV;
193 
194 	cpu = of_cpu_node_to_id(dn);
195 	of_node_put(dn);
196 
197 	return cpu;
198 }
199 
200 /*
201  * of_coresight_parse_endpoint : Parse the given output endpoint @ep
202  * and fill the connection information in @conn
203  *
204  * Parses the local port, remote device name and the remote port.
205  *
206  * Returns :
207  *	 0	- If the parsing completed without any fatal errors.
208  *	-Errno	- Fatal error, abort the scanning.
209  */
210 static int of_coresight_parse_endpoint(struct device *dev,
211 				       struct device_node *ep,
212 				       struct coresight_platform_data *pdata)
213 {
214 	int ret = 0;
215 	struct of_endpoint endpoint, rendpoint;
216 	struct device_node *rparent = NULL;
217 	struct device_node *rep = NULL;
218 	struct device *rdev = NULL;
219 	struct fwnode_handle *rdev_fwnode;
220 	struct coresight_connection *conn;
221 
222 	do {
223 		/* Parse the local port details */
224 		if (of_graph_parse_endpoint(ep, &endpoint))
225 			break;
226 		/*
227 		 * Get a handle on the remote endpoint and the device it is
228 		 * attached to.
229 		 */
230 		rep = of_graph_get_remote_endpoint(ep);
231 		if (!rep)
232 			break;
233 		rparent = of_coresight_get_port_parent(rep);
234 		if (!rparent)
235 			break;
236 		if (of_graph_parse_endpoint(rep, &rendpoint))
237 			break;
238 
239 		rdev_fwnode = of_fwnode_handle(rparent);
240 		/* If the remote device is not available, defer probing */
241 		rdev = coresight_find_device_by_fwnode(rdev_fwnode);
242 		if (!rdev) {
243 			ret = -EPROBE_DEFER;
244 			break;
245 		}
246 
247 		conn = &pdata->conns[endpoint.port];
248 		if (conn->child_fwnode) {
249 			dev_warn(dev, "Duplicate output port %d\n",
250 				 endpoint.port);
251 			ret = -EINVAL;
252 			break;
253 		}
254 		conn->outport = endpoint.port;
255 		/*
256 		 * Hold the refcount to the target device. This could be
257 		 * released via:
258 		 * 1) coresight_release_platform_data() if the probe fails or
259 		 *    this device is unregistered.
260 		 * 2) While removing the target device via
261 		 *    coresight_remove_match()
262 		 */
263 		conn->child_fwnode = fwnode_handle_get(rdev_fwnode);
264 		conn->child_port = rendpoint.port;
265 		/* Connection record updated */
266 	} while (0);
267 
268 	of_node_put(rparent);
269 	of_node_put(rep);
270 	put_device(rdev);
271 
272 	return ret;
273 }
274 
275 static int of_get_coresight_platform_data(struct device *dev,
276 					  struct coresight_platform_data *pdata)
277 {
278 	int ret = 0;
279 	struct device_node *ep = NULL;
280 	const struct device_node *parent = NULL;
281 	bool legacy_binding = false;
282 	struct device_node *node = dev->of_node;
283 
284 	/* Get the number of input and output port for this component */
285 	of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
286 
287 	/* If there are no output connections, we are done */
288 	if (!pdata->nr_outport)
289 		return 0;
290 
291 	ret = coresight_alloc_conns(dev, pdata);
292 	if (ret)
293 		return ret;
294 
295 	parent = of_coresight_get_output_ports_node(node);
296 	/*
297 	 * If the DT uses obsoleted bindings, the ports are listed
298 	 * under the device and we need to filter out the input
299 	 * ports.
300 	 */
301 	if (!parent) {
302 		legacy_binding = true;
303 		parent = node;
304 		dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
305 	}
306 
307 	/* Iterate through each output port to discover topology */
308 	while ((ep = of_graph_get_next_endpoint(parent, ep))) {
309 		/*
310 		 * Legacy binding mixes input/output ports under the
311 		 * same parent. So, skip the input ports if we are dealing
312 		 * with legacy binding, as they processed with their
313 		 * connected output ports.
314 		 */
315 		if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
316 			continue;
317 
318 		ret = of_coresight_parse_endpoint(dev, ep, pdata);
319 		if (ret)
320 			return ret;
321 	}
322 
323 	return 0;
324 }
325 #else
326 static inline int
327 of_get_coresight_platform_data(struct device *dev,
328 			       struct coresight_platform_data *pdata)
329 {
330 	return -ENOENT;
331 }
332 
333 static inline int of_coresight_get_cpu(struct device *dev)
334 {
335 	return -ENODEV;
336 }
337 #endif
338 
339 #ifdef CONFIG_ACPI
340 
341 #include <acpi/actypes.h>
342 #include <acpi/processor.h>
343 
344 /* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
345 static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
346 						0xbd, 0x68, 0xf7, 0xd3,
347 						0x44, 0xef, 0x21, 0x53);
348 /* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
349 static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
350 						     0x81, 0x07, 0xe6, 0x27,
351 						     0xf8, 0x05, 0xc6, 0xcd);
352 #define ACPI_CORESIGHT_LINK_SLAVE	0
353 #define ACPI_CORESIGHT_LINK_MASTER	1
354 
355 static inline bool is_acpi_guid(const union acpi_object *obj)
356 {
357 	return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
358 }
359 
360 /*
361  * acpi_guid_matches	- Checks if the given object is a GUID object and
362  * that it matches the supplied the GUID.
363  */
364 static inline bool acpi_guid_matches(const union acpi_object *obj,
365 				   const guid_t *guid)
366 {
367 	return is_acpi_guid(obj) &&
368 	       guid_equal((guid_t *)obj->buffer.pointer, guid);
369 }
370 
371 static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
372 {
373 	return acpi_guid_matches(obj, &acpi_graph_uuid);
374 }
375 
376 static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
377 {
378 	return acpi_guid_matches(obj, &coresight_graph_uuid);
379 }
380 
381 static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
382 {
383 	const union acpi_object *graphid, *guid, *links;
384 
385 	if (obj->type != ACPI_TYPE_PACKAGE ||
386 	    obj->package.count < 3)
387 		return false;
388 
389 	graphid = &obj->package.elements[0];
390 	guid = &obj->package.elements[1];
391 	links = &obj->package.elements[2];
392 
393 	if (graphid->type != ACPI_TYPE_INTEGER ||
394 	    links->type != ACPI_TYPE_INTEGER)
395 		return false;
396 
397 	return is_acpi_coresight_graph_guid(guid);
398 }
399 
400 /*
401  * acpi_validate_dsd_graph	- Make sure the given _DSD graph conforms
402  * to the ACPI _DSD Graph specification.
403  *
404  * ACPI Devices Graph property has the following format:
405  *  {
406  *	Revision	- Integer, must be 0
407  *	NumberOfGraphs	- Integer, N indicating the following list.
408  *	Graph[1],
409  *	 ...
410  *	Graph[N]
411  *  }
412  *
413  * And each Graph entry has the following format:
414  *  {
415  *	GraphID		- Integer, identifying a graph the device belongs to.
416  *	UUID		- UUID identifying the specification that governs
417  *			  this graph. (e.g, see is_acpi_coresight_graph())
418  *	NumberOfLinks	- Number "N" of connections on this node of the graph.
419  *	Links[1]
420  *	...
421  *	Links[N]
422  *  }
423  *
424  * Where each "Links" entry has the following format:
425  *
426  * {
427  *	SourcePortAddress	- Integer
428  *	DestinationPortAddress	- Integer
429  *	DestinationDeviceName	- Reference to another device
430  *	( --- CoreSight specific extensions below ---)
431  *	DirectionOfFlow		- Integer 1 for output(master)
432  *				  0 for input(slave)
433  * }
434  *
435  * e.g:
436  * For a Funnel device
437  *
438  * Device(MFUN) {
439  *   ...
440  *
441  *   Name (_DSD, Package() {
442  *	// DSD Package contains tuples of {  Proeprty_Type_UUID, Package() }
443  *	ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
444  *	Package() {
445  *		Package(2) { "property-name", <property-value> }
446  *	},
447  *
448  *	ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
449  *	Package() {
450  *	  0,		// Revision
451  *	  1,		// NumberOfGraphs.
452  *	  Package() {	// Graph[0] Package
453  *	     1,		// GraphID
454  *	     // Coresight Graph UUID
455  *	     ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
456  *	     3,		// NumberOfLinks aka ports
457  *	     // Link[0]: Output_0 -> Replicator:Input_0
458  *	     Package () { 0, 0, \_SB_.RPL0, 1 },
459  *	     // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
460  *	     Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
461  *	     // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
462  *	      Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
463  *	  }	// End of Graph[0] Package
464  *
465  *	}, // End of ACPI Graph Property
466  *  })
467  */
468 static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
469 {
470 	int i, n;
471 	const union acpi_object *rev, *nr_graphs;
472 
473 	/* The graph must contain at least the Revision and Number of Graphs */
474 	if (graph->package.count < 2)
475 		return false;
476 
477 	rev = &graph->package.elements[0];
478 	nr_graphs = &graph->package.elements[1];
479 
480 	if (rev->type != ACPI_TYPE_INTEGER ||
481 	    nr_graphs->type != ACPI_TYPE_INTEGER)
482 		return false;
483 
484 	/* We only support revision 0 */
485 	if (rev->integer.value != 0)
486 		return false;
487 
488 	n = nr_graphs->integer.value;
489 	/* CoreSight devices are only part of a single Graph */
490 	if (n != 1)
491 		return false;
492 
493 	/* Make sure the ACPI graph package has right number of elements */
494 	if (graph->package.count != (n + 2))
495 		return false;
496 
497 	/*
498 	 * Each entry must be a graph package with at least 3 members :
499 	 * { GraphID, UUID, NumberOfLinks(n), Links[.],... }
500 	 */
501 	for (i = 2; i < n + 2; i++) {
502 		const union acpi_object *obj = &graph->package.elements[i];
503 
504 		if (obj->type != ACPI_TYPE_PACKAGE ||
505 		    obj->package.count < 3)
506 			return false;
507 	}
508 
509 	return true;
510 }
511 
512 /* acpi_get_dsd_graph	- Find the _DSD Graph property for the given device. */
513 static const union acpi_object *
514 acpi_get_dsd_graph(struct acpi_device *adev)
515 {
516 	int i;
517 	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
518 	acpi_status status;
519 	const union acpi_object *dsd;
520 
521 	status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
522 					    &buf, ACPI_TYPE_PACKAGE);
523 	if (ACPI_FAILURE(status))
524 		return NULL;
525 
526 	dsd = buf.pointer;
527 
528 	/*
529 	 * _DSD property consists tuples { Prop_UUID, Package() }
530 	 * Iterate through all the packages and find the Graph.
531 	 */
532 	for (i = 0; i + 1 < dsd->package.count; i += 2) {
533 		const union acpi_object *guid, *package;
534 
535 		guid = &dsd->package.elements[i];
536 		package = &dsd->package.elements[i + 1];
537 
538 		/* All _DSD elements must have a UUID and a Package */
539 		if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
540 			break;
541 		/* Skip the non-Graph _DSD packages */
542 		if (!is_acpi_dsd_graph_guid(guid))
543 			continue;
544 		if (acpi_validate_dsd_graph(package))
545 			return package;
546 		/* Invalid graph format, continue */
547 		dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
548 	}
549 
550 	return NULL;
551 }
552 
553 static inline bool
554 acpi_validate_coresight_graph(const union acpi_object *cs_graph)
555 {
556 	int nlinks;
557 
558 	nlinks = cs_graph->package.elements[2].integer.value;
559 	/*
560 	 * Graph must have the following fields :
561 	 * { GraphID, GraphUUID, NumberOfLinks, Links... }
562 	 */
563 	if (cs_graph->package.count != (nlinks + 3))
564 		return false;
565 	/* The links are validated in acpi_coresight_parse_link() */
566 	return true;
567 }
568 
569 /*
570  * acpi_get_coresight_graph	- Parse the device _DSD tables and find
571  * the Graph property matching the CoreSight Graphs.
572  *
573  * Returns the pointer to the CoreSight Graph Package when found. Otherwise
574  * returns NULL.
575  */
576 static const union acpi_object *
577 acpi_get_coresight_graph(struct acpi_device *adev)
578 {
579 	const union acpi_object *graph_list, *graph;
580 	int i, nr_graphs;
581 
582 	graph_list = acpi_get_dsd_graph(adev);
583 	if (!graph_list)
584 		return graph_list;
585 
586 	nr_graphs = graph_list->package.elements[1].integer.value;
587 
588 	for (i = 2; i < nr_graphs + 2; i++) {
589 		graph = &graph_list->package.elements[i];
590 		if (!is_acpi_coresight_graph(graph))
591 			continue;
592 		if (acpi_validate_coresight_graph(graph))
593 			return graph;
594 		/* Invalid graph format */
595 		break;
596 	}
597 
598 	return NULL;
599 }
600 
601 /*
602  * acpi_coresight_parse_link	- Parse the given Graph connection
603  * of the device and populate the coresight_connection for an output
604  * connection.
605  *
606  * CoreSight Graph specification mandates that the direction of the data
607  * flow must be specified in the link. i.e,
608  *
609  *	SourcePortAddress,	// Integer
610  *	DestinationPortAddress,	// Integer
611  *	DestinationDeviceName,	// Reference to another device
612  *	DirectionOfFlow,	// 1 for output(master), 0 for input(slave)
613  *
614  * Returns the direction of the data flow [ Input(slave) or Output(master) ]
615  * upon success.
616  * Returns an negative error number otherwise.
617  */
618 static int acpi_coresight_parse_link(struct acpi_device *adev,
619 				     const union acpi_object *link,
620 				     struct coresight_connection *conn)
621 {
622 	int rc, dir;
623 	const union acpi_object *fields;
624 	struct acpi_device *r_adev;
625 	struct device *rdev;
626 
627 	if (link->type != ACPI_TYPE_PACKAGE ||
628 	    link->package.count != 4)
629 		return -EINVAL;
630 
631 	fields = link->package.elements;
632 
633 	if (fields[0].type != ACPI_TYPE_INTEGER ||
634 	    fields[1].type != ACPI_TYPE_INTEGER ||
635 	    fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
636 	    fields[3].type != ACPI_TYPE_INTEGER)
637 		return -EINVAL;
638 
639 	rc = acpi_bus_get_device(fields[2].reference.handle, &r_adev);
640 	if (rc)
641 		return rc;
642 
643 	dir = fields[3].integer.value;
644 	if (dir == ACPI_CORESIGHT_LINK_MASTER) {
645 		conn->outport = fields[0].integer.value;
646 		conn->child_port = fields[1].integer.value;
647 		rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
648 		if (!rdev)
649 			return -EPROBE_DEFER;
650 		/*
651 		 * Hold the refcount to the target device. This could be
652 		 * released via:
653 		 * 1) coresight_release_platform_data() if the probe fails or
654 		 *    this device is unregistered.
655 		 * 2) While removing the target device via
656 		 *    coresight_remove_match().
657 		 */
658 		conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode);
659 	} else if (dir == ACPI_CORESIGHT_LINK_SLAVE) {
660 		/*
661 		 * We are only interested in the port number
662 		 * for the input ports at this component.
663 		 * Store the port number in child_port.
664 		 */
665 		conn->child_port = fields[0].integer.value;
666 	} else {
667 		/* Invalid direction */
668 		return -EINVAL;
669 	}
670 
671 	return dir;
672 }
673 
674 /*
675  * acpi_coresight_parse_graph	- Parse the _DSD CoreSight graph
676  * connection information and populate the supplied coresight_platform_data
677  * instance.
678  */
679 static int acpi_coresight_parse_graph(struct acpi_device *adev,
680 				      struct coresight_platform_data *pdata)
681 {
682 	int rc, i, nlinks;
683 	const union acpi_object *graph;
684 	struct coresight_connection *conns, *ptr;
685 
686 	pdata->nr_inport = pdata->nr_outport = 0;
687 	graph = acpi_get_coresight_graph(adev);
688 	if (!graph)
689 		return -ENOENT;
690 
691 	nlinks = graph->package.elements[2].integer.value;
692 	if (!nlinks)
693 		return 0;
694 
695 	/*
696 	 * To avoid scanning the table twice (once for finding the number of
697 	 * output links and then later for parsing the output links),
698 	 * cache the links information in one go and then later copy
699 	 * it to the pdata.
700 	 */
701 	conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL);
702 	if (!conns)
703 		return -ENOMEM;
704 	ptr = conns;
705 	for (i = 0; i < nlinks; i++) {
706 		const union acpi_object *link = &graph->package.elements[3 + i];
707 		int dir;
708 
709 		dir = acpi_coresight_parse_link(adev, link, ptr);
710 		if (dir < 0)
711 			return dir;
712 
713 		if (dir == ACPI_CORESIGHT_LINK_MASTER) {
714 			if (ptr->outport > pdata->nr_outport)
715 				pdata->nr_outport = ptr->outport;
716 			ptr++;
717 		} else {
718 			WARN_ON(pdata->nr_inport == ptr->child_port);
719 			/*
720 			 * We do not track input port connections for a device.
721 			 * However we need the highest port number described,
722 			 * which can be recorded now and reuse this connection
723 			 * record for an output connection. Hence, do not move
724 			 * the ptr for input connections
725 			 */
726 			if (ptr->child_port > pdata->nr_inport)
727 				pdata->nr_inport = ptr->child_port;
728 		}
729 	}
730 
731 	rc = coresight_alloc_conns(&adev->dev, pdata);
732 	if (rc)
733 		return rc;
734 
735 	/* Copy the connection information to the final location */
736 	for (i = 0; conns + i < ptr; i++) {
737 		int port = conns[i].outport;
738 
739 		/* Duplicate output port */
740 		WARN_ON(pdata->conns[port].child_fwnode);
741 		pdata->conns[port] = conns[i];
742 	}
743 
744 	devm_kfree(&adev->dev, conns);
745 	return 0;
746 }
747 
748 /*
749  * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
750  * logical CPU id of the corresponding CPU device.
751  *
752  * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
753  */
754 static int
755 acpi_handle_to_logical_cpuid(acpi_handle handle)
756 {
757 	int i;
758 	struct acpi_processor *pr;
759 
760 	for_each_possible_cpu(i) {
761 		pr = per_cpu(processors, i);
762 		if (pr && pr->handle == handle)
763 			break;
764 	}
765 
766 	return i;
767 }
768 
769 /*
770  * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
771  * with this coresight device. With ACPI bindings, the CoreSight components
772  * are listed as child device of the associated CPU.
773  *
774  * Returns the logical CPU id when found. Otherwise returns 0.
775  */
776 static int acpi_coresight_get_cpu(struct device *dev)
777 {
778 	int cpu;
779 	acpi_handle cpu_handle;
780 	acpi_status status;
781 	struct acpi_device *adev = ACPI_COMPANION(dev);
782 
783 	if (!adev)
784 		return -ENODEV;
785 	status = acpi_get_parent(adev->handle, &cpu_handle);
786 	if (ACPI_FAILURE(status))
787 		return -ENODEV;
788 
789 	cpu = acpi_handle_to_logical_cpuid(cpu_handle);
790 	if (cpu >= nr_cpu_ids)
791 		return -ENODEV;
792 	return cpu;
793 }
794 
795 static int
796 acpi_get_coresight_platform_data(struct device *dev,
797 				 struct coresight_platform_data *pdata)
798 {
799 	struct acpi_device *adev;
800 
801 	adev = ACPI_COMPANION(dev);
802 	if (!adev)
803 		return -EINVAL;
804 
805 	return acpi_coresight_parse_graph(adev, pdata);
806 }
807 
808 #else
809 
810 static inline int
811 acpi_get_coresight_platform_data(struct device *dev,
812 				 struct coresight_platform_data *pdata)
813 {
814 	return -ENOENT;
815 }
816 
817 static inline int acpi_coresight_get_cpu(struct device *dev)
818 {
819 	return -ENODEV;
820 }
821 #endif
822 
823 int coresight_get_cpu(struct device *dev)
824 {
825 	if (is_of_node(dev->fwnode))
826 		return of_coresight_get_cpu(dev);
827 	else if (is_acpi_device_node(dev->fwnode))
828 		return acpi_coresight_get_cpu(dev);
829 	return 0;
830 }
831 EXPORT_SYMBOL_GPL(coresight_get_cpu);
832 
833 struct coresight_platform_data *
834 coresight_get_platform_data(struct device *dev)
835 {
836 	int ret = -ENOENT;
837 	struct coresight_platform_data *pdata = NULL;
838 	struct fwnode_handle *fwnode = dev_fwnode(dev);
839 
840 	if (IS_ERR_OR_NULL(fwnode))
841 		goto error;
842 
843 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
844 	if (!pdata) {
845 		ret = -ENOMEM;
846 		goto error;
847 	}
848 
849 	if (is_of_node(fwnode))
850 		ret = of_get_coresight_platform_data(dev, pdata);
851 	else if (is_acpi_device_node(fwnode))
852 		ret = acpi_get_coresight_platform_data(dev, pdata);
853 
854 	if (!ret)
855 		return pdata;
856 error:
857 	if (!IS_ERR_OR_NULL(pdata))
858 		/* Cleanup the connection information */
859 		coresight_release_platform_data(NULL, pdata);
860 	return ERR_PTR(ret);
861 }
862 EXPORT_SYMBOL_GPL(coresight_get_platform_data);
863