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ad0dfdfd MP |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (c) 2012, The Linux Foundation. All rights reserved. | |
a06ae860 PP |
4 | */ |
5 | ||
76ffa5ab | 6 | #include <linux/acpi.h> |
a06ae860 PP |
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> | |
8c02a5ba | 18 | #include <linux/cpumask.h> |
a06ae860 PP |
19 | #include <asm/smp_plat.h> |
20 | ||
688da45f | 21 | #include "coresight-priv.h" |
88a1607c SP |
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_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 | ||
f632a817 | 40 | int coresight_device_fwnode_match(struct device *dev, const void *fwnode) |
a06ae860 | 41 | { |
20961aea | 42 | return dev_fwnode(dev) == fwnode; |
a06ae860 PP |
43 | } |
44 | ||
45 | static struct device * | |
20961aea | 46 | coresight_find_device_by_fwnode(struct fwnode_handle *fwnode) |
a06ae860 PP |
47 | { |
48 | struct device *dev = NULL; | |
49 | ||
50 | /* | |
43701236 | 51 | * If we have a non-configurable replicator, it will be found on the |
a06ae860 PP |
52 | * platform bus. |
53 | */ | |
54 | dev = bus_find_device(&platform_bus_type, NULL, | |
20961aea | 55 | fwnode, coresight_device_fwnode_match); |
a06ae860 PP |
56 | if (dev) |
57 | return dev; | |
58 | ||
59 | /* | |
60 | * We have a configurable component - circle through the AMBA bus | |
61 | * looking for the device that matches the endpoint node. | |
62 | */ | |
63 | return bus_find_device(&amba_bustype, NULL, | |
20961aea | 64 | fwnode, coresight_device_fwnode_match); |
a06ae860 PP |
65 | } |
66 | ||
20961aea | 67 | #ifdef CONFIG_OF |
5ecc7120 | 68 | static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep) |
2058224f SP |
69 | { |
70 | return of_property_read_bool(ep, "slave-mode"); | |
71 | } | |
72 | ||
5ecc7120 SP |
73 | static void of_coresight_get_ports_legacy(const struct device_node *node, |
74 | int *nr_inport, int *nr_outport) | |
a06ae860 PP |
75 | { |
76 | struct device_node *ep = NULL; | |
77 | int in = 0, out = 0; | |
78 | ||
79 | do { | |
f033c0bc | 80 | ep = of_graph_get_next_endpoint(node, ep); |
a06ae860 PP |
81 | if (!ep) |
82 | break; | |
83 | ||
5ecc7120 | 84 | if (of_coresight_legacy_ep_is_input(ep)) |
a06ae860 PP |
85 | in++; |
86 | else | |
87 | out++; | |
88 | ||
89 | } while (ep); | |
90 | ||
91 | *nr_inport = in; | |
92 | *nr_outport = out; | |
93 | } | |
94 | ||
5ecc7120 SP |
95 | static struct device_node *of_coresight_get_port_parent(struct device_node *ep) |
96 | { | |
97 | struct device_node *parent = of_graph_get_port_parent(ep); | |
98 | ||
99 | /* | |
100 | * Skip one-level up to the real device node, if we | |
101 | * are using the new bindings. | |
102 | */ | |
c2bc02f8 RH |
103 | if (of_node_name_eq(parent, "in-ports") || |
104 | of_node_name_eq(parent, "out-ports")) | |
5ecc7120 SP |
105 | parent = of_get_next_parent(parent); |
106 | ||
107 | return parent; | |
108 | } | |
109 | ||
110 | static inline struct device_node * | |
111 | of_coresight_get_input_ports_node(const struct device_node *node) | |
112 | { | |
113 | return of_get_child_by_name(node, "in-ports"); | |
114 | } | |
115 | ||
116 | static inline struct device_node * | |
117 | of_coresight_get_output_ports_node(const struct device_node *node) | |
118 | { | |
119 | return of_get_child_by_name(node, "out-ports"); | |
120 | } | |
121 | ||
122 | static inline int | |
123 | of_coresight_count_ports(struct device_node *port_parent) | |
124 | { | |
125 | int i = 0; | |
126 | struct device_node *ep = NULL; | |
127 | ||
128 | while ((ep = of_graph_get_next_endpoint(port_parent, ep))) | |
129 | i++; | |
130 | return i; | |
131 | } | |
132 | ||
133 | static void of_coresight_get_ports(const struct device_node *node, | |
134 | int *nr_inport, int *nr_outport) | |
135 | { | |
136 | struct device_node *input_ports = NULL, *output_ports = NULL; | |
137 | ||
138 | input_ports = of_coresight_get_input_ports_node(node); | |
139 | output_ports = of_coresight_get_output_ports_node(node); | |
140 | ||
141 | if (input_ports || output_ports) { | |
142 | if (input_ports) { | |
143 | *nr_inport = of_coresight_count_ports(input_ports); | |
144 | of_node_put(input_ports); | |
145 | } | |
146 | if (output_ports) { | |
147 | *nr_outport = of_coresight_count_ports(output_ports); | |
148 | of_node_put(output_ports); | |
149 | } | |
150 | } else { | |
151 | /* Fall back to legacy DT bindings parsing */ | |
152 | of_coresight_get_ports_legacy(node, nr_inport, nr_outport); | |
153 | } | |
154 | } | |
155 | ||
91824db2 | 156 | static int of_coresight_get_cpu(struct device *dev) |
c56cdd7a LY |
157 | { |
158 | int cpu; | |
29198e38 | 159 | struct device_node *dn; |
c56cdd7a | 160 | |
91824db2 | 161 | if (!dev->of_node) |
996cdfaf SPR |
162 | return -ENODEV; |
163 | ||
91824db2 | 164 | dn = of_parse_phandle(dev->of_node, "cpu", 0); |
c56cdd7a | 165 | if (!dn) |
996cdfaf SPR |
166 | return -ENODEV; |
167 | ||
29198e38 | 168 | cpu = of_cpu_node_to_id(dn); |
c56cdd7a LY |
169 | of_node_put(dn); |
170 | ||
996cdfaf | 171 | return cpu; |
c56cdd7a | 172 | } |
c56cdd7a | 173 | |
6575fdb7 SP |
174 | /* |
175 | * of_coresight_parse_endpoint : Parse the given output endpoint @ep | |
c2c72941 | 176 | * and fill the connection information in @conn |
6575fdb7 SP |
177 | * |
178 | * Parses the local port, remote device name and the remote port. | |
179 | * | |
180 | * Returns : | |
181 | * 1 - If the parsing is successful and a connection record | |
182 | * was created for an output connection. | |
183 | * 0 - If the parsing completed without any fatal errors. | |
184 | * -Errno - Fatal error, abort the scanning. | |
185 | */ | |
186 | static int of_coresight_parse_endpoint(struct device *dev, | |
187 | struct device_node *ep, | |
c2c72941 | 188 | struct coresight_connection *conn) |
6575fdb7 SP |
189 | { |
190 | int ret = 0; | |
191 | struct of_endpoint endpoint, rendpoint; | |
192 | struct device_node *rparent = NULL; | |
96330407 | 193 | struct device_node *rep = NULL; |
6575fdb7 | 194 | struct device *rdev = NULL; |
20961aea | 195 | struct fwnode_handle *rdev_fwnode; |
6575fdb7 SP |
196 | |
197 | do { | |
198 | /* Parse the local port details */ | |
199 | if (of_graph_parse_endpoint(ep, &endpoint)) | |
200 | break; | |
201 | /* | |
96330407 SP |
202 | * Get a handle on the remote endpoint and the device it is |
203 | * attached to. | |
6575fdb7 | 204 | */ |
96330407 SP |
205 | rep = of_graph_get_remote_endpoint(ep); |
206 | if (!rep) | |
6575fdb7 | 207 | break; |
5ecc7120 | 208 | rparent = of_coresight_get_port_parent(rep); |
96330407 | 209 | if (!rparent) |
6575fdb7 | 210 | break; |
96330407 | 211 | if (of_graph_parse_endpoint(rep, &rendpoint)) |
6575fdb7 SP |
212 | break; |
213 | ||
20961aea | 214 | rdev_fwnode = of_fwnode_handle(rparent); |
6575fdb7 | 215 | /* If the remote device is not available, defer probing */ |
20961aea | 216 | rdev = coresight_find_device_by_fwnode(rdev_fwnode); |
6575fdb7 SP |
217 | if (!rdev) { |
218 | ret = -EPROBE_DEFER; | |
219 | break; | |
220 | } | |
221 | ||
c2c72941 | 222 | conn->outport = endpoint.port; |
37ea1ffd SP |
223 | /* |
224 | * Hold the refcount to the target device. This could be | |
225 | * released via: | |
226 | * 1) coresight_release_platform_data() if the probe fails or | |
227 | * this device is unregistered. | |
228 | * 2) While removing the target device via | |
229 | * coresight_remove_match() | |
230 | */ | |
231 | conn->child_fwnode = fwnode_handle_get(rdev_fwnode); | |
c2c72941 | 232 | conn->child_port = rendpoint.port; |
6575fdb7 SP |
233 | /* Connection record updated */ |
234 | ret = 1; | |
235 | } while (0); | |
236 | ||
bbbecc64 | 237 | of_node_put(rparent); |
238 | of_node_put(rep); | |
239 | put_device(rdev); | |
a0f9992c | 240 | |
6575fdb7 SP |
241 | return ret; |
242 | } | |
243 | ||
f03631da SP |
244 | static int of_get_coresight_platform_data(struct device *dev, |
245 | struct coresight_platform_data *pdata) | |
a06ae860 | 246 | { |
c2c72941 | 247 | int ret = 0; |
c2c72941 | 248 | struct coresight_connection *conn; |
a06ae860 | 249 | struct device_node *ep = NULL; |
5ecc7120 SP |
250 | const struct device_node *parent = NULL; |
251 | bool legacy_binding = false; | |
f03631da | 252 | struct device_node *node = dev->of_node; |
a06ae860 | 253 | |
a06ae860 PP |
254 | /* Get the number of input and output port for this component */ |
255 | of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport); | |
256 | ||
6575fdb7 SP |
257 | /* If there are no output connections, we are done */ |
258 | if (!pdata->nr_outport) | |
f03631da | 259 | return 0; |
6575fdb7 | 260 | |
88a1607c | 261 | ret = coresight_alloc_conns(dev, pdata); |
6575fdb7 | 262 | if (ret) |
f03631da | 263 | return ret; |
6575fdb7 | 264 | |
5ecc7120 SP |
265 | parent = of_coresight_get_output_ports_node(node); |
266 | /* | |
267 | * If the DT uses obsoleted bindings, the ports are listed | |
268 | * under the device and we need to filter out the input | |
269 | * ports. | |
270 | */ | |
271 | if (!parent) { | |
272 | legacy_binding = true; | |
273 | parent = node; | |
274 | dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n"); | |
275 | } | |
276 | ||
c2c72941 | 277 | conn = pdata->conns; |
5ecc7120 SP |
278 | |
279 | /* Iterate through each output port to discover topology */ | |
280 | while ((ep = of_graph_get_next_endpoint(parent, ep))) { | |
6575fdb7 | 281 | /* |
5ecc7120 SP |
282 | * Legacy binding mixes input/output ports under the |
283 | * same parent. So, skip the input ports if we are dealing | |
284 | * with legacy binding, as they processed with their | |
285 | * connected output ports. | |
6575fdb7 | 286 | */ |
5ecc7120 | 287 | if (legacy_binding && of_coresight_legacy_ep_is_input(ep)) |
6575fdb7 SP |
288 | continue; |
289 | ||
c2c72941 | 290 | ret = of_coresight_parse_endpoint(dev, ep, conn); |
6575fdb7 SP |
291 | switch (ret) { |
292 | case 1: | |
c2c72941 | 293 | conn++; /* Fall through */ |
6575fdb7 SP |
294 | case 0: |
295 | break; | |
296 | default: | |
f03631da | 297 | return ret; |
6575fdb7 | 298 | } |
a06ae860 PP |
299 | } |
300 | ||
f03631da SP |
301 | return 0; |
302 | } | |
303 | #else | |
304 | static inline int | |
305 | of_get_coresight_platform_data(struct device *dev, | |
306 | struct coresight_platform_data *pdata) | |
307 | { | |
308 | return -ENOENT; | |
a06ae860 | 309 | } |
40a1c5b3 SP |
310 | |
311 | static inline int of_coresight_get_cpu(struct device *dev) | |
312 | { | |
996cdfaf | 313 | return -ENODEV; |
40a1c5b3 | 314 | } |
22aa495a | 315 | #endif |
f03631da | 316 | |
76ffa5ab SP |
317 | #ifdef CONFIG_ACPI |
318 | ||
319 | #include <acpi/actypes.h> | |
320 | #include <acpi/processor.h> | |
321 | ||
322 | /* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */ | |
323 | static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2, | |
324 | 0xbd, 0x68, 0xf7, 0xd3, | |
325 | 0x44, 0xef, 0x21, 0x53); | |
326 | /* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */ | |
327 | static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3, | |
328 | 0x81, 0x07, 0xe6, 0x27, | |
329 | 0xf8, 0x05, 0xc6, 0xcd); | |
330 | #define ACPI_CORESIGHT_LINK_SLAVE 0 | |
331 | #define ACPI_CORESIGHT_LINK_MASTER 1 | |
332 | ||
333 | static inline bool is_acpi_guid(const union acpi_object *obj) | |
334 | { | |
335 | return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16); | |
336 | } | |
337 | ||
338 | /* | |
339 | * acpi_guid_matches - Checks if the given object is a GUID object and | |
340 | * that it matches the supplied the GUID. | |
341 | */ | |
342 | static inline bool acpi_guid_matches(const union acpi_object *obj, | |
343 | const guid_t *guid) | |
344 | { | |
345 | return is_acpi_guid(obj) && | |
346 | guid_equal((guid_t *)obj->buffer.pointer, guid); | |
347 | } | |
348 | ||
349 | static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj) | |
350 | { | |
351 | return acpi_guid_matches(obj, &acpi_graph_uuid); | |
352 | } | |
353 | ||
354 | static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj) | |
355 | { | |
356 | return acpi_guid_matches(obj, &coresight_graph_uuid); | |
357 | } | |
358 | ||
359 | static inline bool is_acpi_coresight_graph(const union acpi_object *obj) | |
360 | { | |
361 | const union acpi_object *graphid, *guid, *links; | |
362 | ||
363 | if (obj->type != ACPI_TYPE_PACKAGE || | |
364 | obj->package.count < 3) | |
365 | return false; | |
366 | ||
367 | graphid = &obj->package.elements[0]; | |
368 | guid = &obj->package.elements[1]; | |
369 | links = &obj->package.elements[2]; | |
370 | ||
371 | if (graphid->type != ACPI_TYPE_INTEGER || | |
372 | links->type != ACPI_TYPE_INTEGER) | |
373 | return false; | |
374 | ||
375 | return is_acpi_coresight_graph_guid(guid); | |
376 | } | |
377 | ||
378 | /* | |
379 | * acpi_validate_dsd_graph - Make sure the given _DSD graph conforms | |
380 | * to the ACPI _DSD Graph specification. | |
381 | * | |
382 | * ACPI Devices Graph property has the following format: | |
383 | * { | |
384 | * Revision - Integer, must be 0 | |
385 | * NumberOfGraphs - Integer, N indicating the following list. | |
386 | * Graph[1], | |
387 | * ... | |
388 | * Graph[N] | |
389 | * } | |
390 | * | |
391 | * And each Graph entry has the following format: | |
392 | * { | |
393 | * GraphID - Integer, identifying a graph the device belongs to. | |
394 | * UUID - UUID identifying the specification that governs | |
395 | * this graph. (e.g, see is_acpi_coresight_graph()) | |
396 | * NumberOfLinks - Number "N" of connections on this node of the graph. | |
397 | * Links[1] | |
398 | * ... | |
399 | * Links[N] | |
400 | * } | |
401 | * | |
402 | * Where each "Links" entry has the following format: | |
403 | * | |
404 | * { | |
405 | * SourcePortAddress - Integer | |
406 | * DestinationPortAddress - Integer | |
407 | * DestinationDeviceName - Reference to another device | |
408 | * ( --- CoreSight specific extensions below ---) | |
409 | * DirectionOfFlow - Integer 1 for output(master) | |
410 | * 0 for input(slave) | |
411 | * } | |
412 | * | |
413 | * e.g: | |
414 | * For a Funnel device | |
415 | * | |
416 | * Device(MFUN) { | |
417 | * ... | |
418 | * | |
419 | * Name (_DSD, Package() { | |
420 | * // DSD Package contains tuples of { Proeprty_Type_UUID, Package() } | |
421 | * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID | |
422 | * Package() { | |
423 | * Package(2) { "property-name", <property-value> } | |
424 | * }, | |
425 | * | |
426 | * ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID | |
427 | * Package() { | |
428 | * 0, // Revision | |
429 | * 1, // NumberOfGraphs. | |
430 | * Package() { // Graph[0] Package | |
431 | * 1, // GraphID | |
432 | * // Coresight Graph UUID | |
433 | * ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"), | |
434 | * 3, // NumberOfLinks aka ports | |
435 | * // Link[0]: Output_0 -> Replicator:Input_0 | |
436 | * Package () { 0, 0, \_SB_.RPL0, 1 }, | |
437 | * // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0 | |
438 | * Package () { 0, 0, \_SB_.CLU0.FUN0, 0 }, | |
439 | * // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0 | |
440 | * Package () { 1, 0, \_SB_.CLU1.FUN0, 0 }, | |
441 | * } // End of Graph[0] Package | |
442 | * | |
443 | * }, // End of ACPI Graph Property | |
444 | * }) | |
445 | */ | |
446 | static inline bool acpi_validate_dsd_graph(const union acpi_object *graph) | |
447 | { | |
448 | int i, n; | |
449 | const union acpi_object *rev, *nr_graphs; | |
450 | ||
451 | /* The graph must contain at least the Revision and Number of Graphs */ | |
452 | if (graph->package.count < 2) | |
453 | return false; | |
454 | ||
455 | rev = &graph->package.elements[0]; | |
456 | nr_graphs = &graph->package.elements[1]; | |
457 | ||
458 | if (rev->type != ACPI_TYPE_INTEGER || | |
459 | nr_graphs->type != ACPI_TYPE_INTEGER) | |
460 | return false; | |
461 | ||
462 | /* We only support revision 0 */ | |
463 | if (rev->integer.value != 0) | |
464 | return false; | |
465 | ||
466 | n = nr_graphs->integer.value; | |
467 | /* CoreSight devices are only part of a single Graph */ | |
468 | if (n != 1) | |
469 | return false; | |
470 | ||
471 | /* Make sure the ACPI graph package has right number of elements */ | |
472 | if (graph->package.count != (n + 2)) | |
473 | return false; | |
474 | ||
475 | /* | |
476 | * Each entry must be a graph package with at least 3 members : | |
477 | * { GraphID, UUID, NumberOfLinks(n), Links[.],... } | |
478 | */ | |
479 | for (i = 2; i < n + 2; i++) { | |
480 | const union acpi_object *obj = &graph->package.elements[i]; | |
481 | ||
482 | if (obj->type != ACPI_TYPE_PACKAGE || | |
483 | obj->package.count < 3) | |
484 | return false; | |
485 | } | |
486 | ||
487 | return true; | |
488 | } | |
489 | ||
490 | /* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */ | |
491 | const union acpi_object * | |
492 | acpi_get_dsd_graph(struct acpi_device *adev) | |
493 | { | |
494 | int i; | |
495 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; | |
496 | acpi_status status; | |
497 | const union acpi_object *dsd; | |
498 | ||
499 | status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, | |
500 | &buf, ACPI_TYPE_PACKAGE); | |
501 | if (ACPI_FAILURE(status)) | |
502 | return NULL; | |
503 | ||
504 | dsd = buf.pointer; | |
505 | ||
506 | /* | |
507 | * _DSD property consists tuples { Prop_UUID, Package() } | |
508 | * Iterate through all the packages and find the Graph. | |
509 | */ | |
510 | for (i = 0; i + 1 < dsd->package.count; i += 2) { | |
511 | const union acpi_object *guid, *package; | |
512 | ||
513 | guid = &dsd->package.elements[i]; | |
514 | package = &dsd->package.elements[i + 1]; | |
515 | ||
516 | /* All _DSD elements must have a UUID and a Package */ | |
517 | if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE) | |
518 | break; | |
519 | /* Skip the non-Graph _DSD packages */ | |
520 | if (!is_acpi_dsd_graph_guid(guid)) | |
521 | continue; | |
522 | if (acpi_validate_dsd_graph(package)) | |
523 | return package; | |
524 | /* Invalid graph format, continue */ | |
525 | dev_warn(&adev->dev, "Invalid Graph _DSD property\n"); | |
526 | } | |
527 | ||
528 | return NULL; | |
529 | } | |
530 | ||
531 | static inline bool | |
532 | acpi_validate_coresight_graph(const union acpi_object *cs_graph) | |
533 | { | |
534 | int nlinks; | |
535 | ||
536 | nlinks = cs_graph->package.elements[2].integer.value; | |
537 | /* | |
538 | * Graph must have the following fields : | |
539 | * { GraphID, GraphUUID, NumberOfLinks, Links... } | |
540 | */ | |
541 | if (cs_graph->package.count != (nlinks + 3)) | |
542 | return false; | |
543 | /* The links are validated in acpi_coresight_parse_link() */ | |
544 | return true; | |
545 | } | |
546 | ||
547 | /* | |
548 | * acpi_get_coresight_graph - Parse the device _DSD tables and find | |
549 | * the Graph property matching the CoreSight Graphs. | |
550 | * | |
551 | * Returns the pointer to the CoreSight Graph Package when found. Otherwise | |
552 | * returns NULL. | |
553 | */ | |
554 | const union acpi_object * | |
555 | acpi_get_coresight_graph(struct acpi_device *adev) | |
556 | { | |
557 | const union acpi_object *graph_list, *graph; | |
558 | int i, nr_graphs; | |
559 | ||
560 | graph_list = acpi_get_dsd_graph(adev); | |
561 | if (!graph_list) | |
562 | return graph_list; | |
563 | ||
564 | nr_graphs = graph_list->package.elements[1].integer.value; | |
565 | ||
566 | for (i = 2; i < nr_graphs + 2; i++) { | |
567 | graph = &graph_list->package.elements[i]; | |
568 | if (!is_acpi_coresight_graph(graph)) | |
569 | continue; | |
570 | if (acpi_validate_coresight_graph(graph)) | |
571 | return graph; | |
572 | /* Invalid graph format */ | |
573 | break; | |
574 | } | |
575 | ||
576 | return NULL; | |
577 | } | |
578 | ||
579 | /* | |
580 | * acpi_coresight_parse_link - Parse the given Graph connection | |
581 | * of the device and populate the coresight_connection for an output | |
582 | * connection. | |
583 | * | |
584 | * CoreSight Graph specification mandates that the direction of the data | |
585 | * flow must be specified in the link. i.e, | |
586 | * | |
587 | * SourcePortAddress, // Integer | |
588 | * DestinationPortAddress, // Integer | |
589 | * DestinationDeviceName, // Reference to another device | |
590 | * DirectionOfFlow, // 1 for output(master), 0 for input(slave) | |
591 | * | |
592 | * Returns the direction of the data flow [ Input(slave) or Output(master) ] | |
593 | * upon success. | |
594 | * Returns an negative error number otherwise. | |
595 | */ | |
596 | static int acpi_coresight_parse_link(struct acpi_device *adev, | |
597 | const union acpi_object *link, | |
598 | struct coresight_connection *conn) | |
599 | { | |
600 | int rc, dir; | |
601 | const union acpi_object *fields; | |
602 | struct acpi_device *r_adev; | |
603 | struct device *rdev; | |
604 | ||
605 | if (link->type != ACPI_TYPE_PACKAGE || | |
606 | link->package.count != 4) | |
607 | return -EINVAL; | |
608 | ||
609 | fields = link->package.elements; | |
610 | ||
611 | if (fields[0].type != ACPI_TYPE_INTEGER || | |
612 | fields[1].type != ACPI_TYPE_INTEGER || | |
613 | fields[2].type != ACPI_TYPE_LOCAL_REFERENCE || | |
614 | fields[3].type != ACPI_TYPE_INTEGER) | |
615 | return -EINVAL; | |
616 | ||
617 | rc = acpi_bus_get_device(fields[2].reference.handle, &r_adev); | |
618 | if (rc) | |
619 | return rc; | |
620 | ||
621 | dir = fields[3].integer.value; | |
622 | if (dir == ACPI_CORESIGHT_LINK_MASTER) { | |
623 | conn->outport = fields[0].integer.value; | |
624 | conn->child_port = fields[1].integer.value; | |
625 | rdev = coresight_find_device_by_fwnode(&r_adev->fwnode); | |
626 | if (!rdev) | |
627 | return -EPROBE_DEFER; | |
628 | /* | |
629 | * Hold the refcount to the target device. This could be | |
630 | * released via: | |
631 | * 1) coresight_release_platform_data() if the probe fails or | |
632 | * this device is unregistered. | |
633 | * 2) While removing the target device via | |
634 | * coresight_remove_match(). | |
635 | */ | |
636 | conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode); | |
637 | } | |
638 | ||
639 | return dir; | |
640 | } | |
641 | ||
642 | /* | |
643 | * acpi_coresight_parse_graph - Parse the _DSD CoreSight graph | |
644 | * connection information and populate the supplied coresight_platform_data | |
645 | * instance. | |
646 | */ | |
647 | static int acpi_coresight_parse_graph(struct acpi_device *adev, | |
648 | struct coresight_platform_data *pdata) | |
649 | { | |
650 | int rc, i, nlinks; | |
651 | const union acpi_object *graph; | |
652 | struct coresight_connection *conns, *ptr; | |
653 | ||
654 | pdata->nr_inport = pdata->nr_outport = 0; | |
655 | graph = acpi_get_coresight_graph(adev); | |
656 | if (!graph) | |
657 | return -ENOENT; | |
658 | ||
659 | nlinks = graph->package.elements[2].integer.value; | |
660 | if (!nlinks) | |
661 | return 0; | |
662 | ||
663 | /* | |
664 | * To avoid scanning the table twice (once for finding the number of | |
665 | * output links and then later for parsing the output links), | |
666 | * cache the links information in one go and then later copy | |
667 | * it to the pdata. | |
668 | */ | |
669 | conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL); | |
670 | if (!conns) | |
671 | return -ENOMEM; | |
672 | ptr = conns; | |
673 | for (i = 0; i < nlinks; i++) { | |
674 | const union acpi_object *link = &graph->package.elements[3 + i]; | |
675 | int dir; | |
676 | ||
677 | dir = acpi_coresight_parse_link(adev, link, ptr); | |
678 | if (dir < 0) | |
679 | return dir; | |
680 | ||
681 | if (dir == ACPI_CORESIGHT_LINK_MASTER) { | |
682 | pdata->nr_outport++; | |
683 | ptr++; | |
684 | } else { | |
685 | pdata->nr_inport++; | |
686 | } | |
687 | } | |
688 | ||
689 | rc = coresight_alloc_conns(&adev->dev, pdata); | |
690 | if (rc) | |
691 | return rc; | |
692 | ||
693 | /* Copy the connection information to the final location */ | |
694 | for (i = 0; i < pdata->nr_outport; i++) | |
695 | pdata->conns[i] = conns[i]; | |
696 | ||
697 | devm_kfree(&adev->dev, conns); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | /* | |
702 | * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the | |
703 | * logical CPU id of the corresponding CPU device. | |
704 | * | |
705 | * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id. | |
706 | */ | |
707 | static int | |
708 | acpi_handle_to_logical_cpuid(acpi_handle handle) | |
709 | { | |
710 | int i; | |
711 | struct acpi_processor *pr; | |
712 | ||
713 | for_each_possible_cpu(i) { | |
714 | pr = per_cpu(processors, i); | |
715 | if (pr && pr->handle == handle) | |
716 | break; | |
717 | } | |
718 | ||
719 | return i; | |
720 | } | |
721 | ||
722 | /* | |
723 | * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated | |
724 | * with this coresight device. With ACPI bindings, the CoreSight components | |
725 | * are listed as child device of the associated CPU. | |
726 | * | |
727 | * Returns the logical CPU id when found. Otherwise returns 0. | |
728 | */ | |
729 | static int acpi_coresight_get_cpu(struct device *dev) | |
730 | { | |
731 | int cpu; | |
732 | acpi_handle cpu_handle; | |
733 | acpi_status status; | |
734 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
735 | ||
736 | if (!adev) | |
996cdfaf | 737 | return -ENODEV; |
76ffa5ab SP |
738 | status = acpi_get_parent(adev->handle, &cpu_handle); |
739 | if (ACPI_FAILURE(status)) | |
996cdfaf | 740 | return -ENODEV; |
76ffa5ab SP |
741 | |
742 | cpu = acpi_handle_to_logical_cpuid(cpu_handle); | |
743 | if (cpu >= nr_cpu_ids) | |
996cdfaf | 744 | return -ENODEV; |
76ffa5ab SP |
745 | return cpu; |
746 | } | |
747 | ||
748 | static int | |
749 | acpi_get_coresight_platform_data(struct device *dev, | |
750 | struct coresight_platform_data *pdata) | |
751 | { | |
752 | struct acpi_device *adev; | |
753 | ||
754 | adev = ACPI_COMPANION(dev); | |
755 | if (!adev) | |
756 | return -EINVAL; | |
757 | ||
758 | return acpi_coresight_parse_graph(adev, pdata); | |
759 | } | |
760 | ||
761 | #else | |
762 | ||
763 | static inline int | |
764 | acpi_get_coresight_platform_data(struct device *dev, | |
765 | struct coresight_platform_data *pdata) | |
766 | { | |
767 | return -ENOENT; | |
768 | } | |
769 | ||
770 | static inline int acpi_coresight_get_cpu(struct device *dev) | |
771 | { | |
996cdfaf | 772 | return -ENODEV; |
76ffa5ab SP |
773 | } |
774 | #endif | |
775 | ||
91824db2 SP |
776 | int coresight_get_cpu(struct device *dev) |
777 | { | |
778 | if (is_of_node(dev->fwnode)) | |
779 | return of_coresight_get_cpu(dev); | |
76ffa5ab SP |
780 | else if (is_acpi_device_node(dev->fwnode)) |
781 | return acpi_coresight_get_cpu(dev); | |
91824db2 SP |
782 | return 0; |
783 | } | |
784 | EXPORT_SYMBOL_GPL(coresight_get_cpu); | |
785 | ||
f03631da SP |
786 | struct coresight_platform_data * |
787 | coresight_get_platform_data(struct device *dev) | |
788 | { | |
789 | int ret = -ENOENT; | |
688da45f | 790 | struct coresight_platform_data *pdata = NULL; |
f03631da SP |
791 | struct fwnode_handle *fwnode = dev_fwnode(dev); |
792 | ||
793 | if (IS_ERR_OR_NULL(fwnode)) | |
794 | goto error; | |
795 | ||
796 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
797 | if (!pdata) { | |
798 | ret = -ENOMEM; | |
799 | goto error; | |
800 | } | |
801 | ||
f03631da SP |
802 | if (is_of_node(fwnode)) |
803 | ret = of_get_coresight_platform_data(dev, pdata); | |
76ffa5ab SP |
804 | else if (is_acpi_device_node(fwnode)) |
805 | ret = acpi_get_coresight_platform_data(dev, pdata); | |
f03631da SP |
806 | |
807 | if (!ret) | |
808 | return pdata; | |
809 | error: | |
688da45f SP |
810 | if (!IS_ERR_OR_NULL(pdata)) |
811 | /* Cleanup the connection information */ | |
812 | coresight_release_platform_data(pdata); | |
f03631da SP |
813 | return ERR_PTR(ret); |
814 | } | |
815 | EXPORT_SYMBOL_GPL(coresight_get_platform_data); |