Pratik Patel | a06ae86 | 2014-11-03 11:07:35 -0700 | [diff] [blame] | 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/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/io.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/export.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/mutex.h> |
| 23 | #include <linux/clk.h> |
| 24 | #include <linux/coresight.h> |
| 25 | #include <linux/of_platform.h> |
| 26 | #include <linux/delay.h> |
| 27 | |
| 28 | #include "coresight-priv.h" |
| 29 | |
| 30 | static DEFINE_MUTEX(coresight_mutex); |
| 31 | |
| 32 | static int coresight_id_match(struct device *dev, void *data) |
| 33 | { |
| 34 | int trace_id, i_trace_id; |
| 35 | struct coresight_device *csdev, *i_csdev; |
| 36 | |
| 37 | csdev = data; |
| 38 | i_csdev = to_coresight_device(dev); |
| 39 | |
| 40 | /* |
| 41 | * No need to care about oneself and components that are not |
| 42 | * sources or not enabled |
| 43 | */ |
| 44 | if (i_csdev == csdev || !i_csdev->enable || |
| 45 | i_csdev->type != CORESIGHT_DEV_TYPE_SOURCE) |
| 46 | return 0; |
| 47 | |
| 48 | /* Get the source ID for both compoment */ |
| 49 | trace_id = source_ops(csdev)->trace_id(csdev); |
| 50 | i_trace_id = source_ops(i_csdev)->trace_id(i_csdev); |
| 51 | |
| 52 | /* All you need is one */ |
| 53 | if (trace_id == i_trace_id) |
| 54 | return 1; |
| 55 | |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static int coresight_source_is_unique(struct coresight_device *csdev) |
| 60 | { |
| 61 | int trace_id = source_ops(csdev)->trace_id(csdev); |
| 62 | |
| 63 | /* this shouldn't happen */ |
| 64 | if (trace_id < 0) |
| 65 | return 0; |
| 66 | |
| 67 | return !bus_for_each_dev(&coresight_bustype, NULL, |
| 68 | csdev, coresight_id_match); |
| 69 | } |
| 70 | |
| 71 | static int coresight_find_link_inport(struct coresight_device *csdev) |
| 72 | { |
| 73 | int i; |
| 74 | struct coresight_device *parent; |
| 75 | struct coresight_connection *conn; |
| 76 | |
| 77 | parent = container_of(csdev->path_link.next, |
| 78 | struct coresight_device, path_link); |
| 79 | |
| 80 | for (i = 0; i < parent->nr_outport; i++) { |
| 81 | conn = &parent->conns[i]; |
| 82 | if (conn->child_dev == csdev) |
| 83 | return conn->child_port; |
| 84 | } |
| 85 | |
| 86 | dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n", |
| 87 | dev_name(&parent->dev), dev_name(&csdev->dev)); |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static int coresight_find_link_outport(struct coresight_device *csdev) |
| 93 | { |
| 94 | int i; |
| 95 | struct coresight_device *child; |
| 96 | struct coresight_connection *conn; |
| 97 | |
| 98 | child = container_of(csdev->path_link.prev, |
| 99 | struct coresight_device, path_link); |
| 100 | |
| 101 | for (i = 0; i < csdev->nr_outport; i++) { |
| 102 | conn = &csdev->conns[i]; |
| 103 | if (conn->child_dev == child) |
| 104 | return conn->outport; |
| 105 | } |
| 106 | |
| 107 | dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n", |
| 108 | dev_name(&csdev->dev), dev_name(&child->dev)); |
| 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static int coresight_enable_sink(struct coresight_device *csdev) |
| 114 | { |
| 115 | int ret; |
| 116 | |
| 117 | if (!csdev->enable) { |
| 118 | if (sink_ops(csdev)->enable) { |
| 119 | ret = sink_ops(csdev)->enable(csdev); |
| 120 | if (ret) |
| 121 | return ret; |
| 122 | } |
| 123 | csdev->enable = true; |
| 124 | } |
| 125 | |
| 126 | atomic_inc(csdev->refcnt); |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static void coresight_disable_sink(struct coresight_device *csdev) |
| 132 | { |
| 133 | if (atomic_dec_return(csdev->refcnt) == 0) { |
| 134 | if (sink_ops(csdev)->disable) { |
| 135 | sink_ops(csdev)->disable(csdev); |
| 136 | csdev->enable = false; |
| 137 | } |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | static int coresight_enable_link(struct coresight_device *csdev) |
| 142 | { |
| 143 | int ret; |
| 144 | int link_subtype; |
| 145 | int refport, inport, outport; |
| 146 | |
| 147 | inport = coresight_find_link_inport(csdev); |
| 148 | outport = coresight_find_link_outport(csdev); |
| 149 | link_subtype = csdev->subtype.link_subtype; |
| 150 | |
| 151 | if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) |
| 152 | refport = inport; |
| 153 | else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) |
| 154 | refport = outport; |
| 155 | else |
| 156 | refport = 0; |
| 157 | |
| 158 | if (atomic_inc_return(&csdev->refcnt[refport]) == 1) { |
| 159 | if (link_ops(csdev)->enable) { |
| 160 | ret = link_ops(csdev)->enable(csdev, inport, outport); |
| 161 | if (ret) |
| 162 | return ret; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | csdev->enable = true; |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static void coresight_disable_link(struct coresight_device *csdev) |
| 172 | { |
| 173 | int i, nr_conns; |
| 174 | int link_subtype; |
| 175 | int refport, inport, outport; |
| 176 | |
| 177 | inport = coresight_find_link_inport(csdev); |
| 178 | outport = coresight_find_link_outport(csdev); |
| 179 | link_subtype = csdev->subtype.link_subtype; |
| 180 | |
| 181 | if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) { |
| 182 | refport = inport; |
| 183 | nr_conns = csdev->nr_inport; |
| 184 | } else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) { |
| 185 | refport = outport; |
| 186 | nr_conns = csdev->nr_outport; |
| 187 | } else { |
| 188 | refport = 0; |
| 189 | nr_conns = 1; |
| 190 | } |
| 191 | |
| 192 | if (atomic_dec_return(&csdev->refcnt[refport]) == 0) { |
| 193 | if (link_ops(csdev)->disable) |
| 194 | link_ops(csdev)->disable(csdev, inport, outport); |
| 195 | } |
| 196 | |
| 197 | for (i = 0; i < nr_conns; i++) |
| 198 | if (atomic_read(&csdev->refcnt[i]) != 0) |
| 199 | return; |
| 200 | |
| 201 | csdev->enable = false; |
| 202 | } |
| 203 | |
| 204 | static int coresight_enable_source(struct coresight_device *csdev) |
| 205 | { |
| 206 | int ret; |
| 207 | |
| 208 | if (!coresight_source_is_unique(csdev)) { |
| 209 | dev_warn(&csdev->dev, "traceID %d not unique\n", |
| 210 | source_ops(csdev)->trace_id(csdev)); |
| 211 | return -EINVAL; |
| 212 | } |
| 213 | |
| 214 | if (!csdev->enable) { |
| 215 | if (source_ops(csdev)->enable) { |
| 216 | ret = source_ops(csdev)->enable(csdev); |
| 217 | if (ret) |
| 218 | return ret; |
| 219 | } |
| 220 | csdev->enable = true; |
| 221 | } |
| 222 | |
| 223 | atomic_inc(csdev->refcnt); |
| 224 | |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | static void coresight_disable_source(struct coresight_device *csdev) |
| 229 | { |
| 230 | if (atomic_dec_return(csdev->refcnt) == 0) { |
| 231 | if (source_ops(csdev)->disable) { |
| 232 | source_ops(csdev)->disable(csdev); |
| 233 | csdev->enable = false; |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | static int coresight_enable_path(struct list_head *path) |
| 239 | { |
| 240 | int ret = 0; |
| 241 | struct coresight_device *cd; |
| 242 | |
| 243 | list_for_each_entry(cd, path, path_link) { |
| 244 | if (cd == list_first_entry(path, struct coresight_device, |
| 245 | path_link)) { |
| 246 | ret = coresight_enable_sink(cd); |
| 247 | } else if (list_is_last(&cd->path_link, path)) { |
| 248 | /* |
| 249 | * Don't enable the source just yet - this needs to |
| 250 | * happen at the very end when all links and sink |
| 251 | * along the path have been configured properly. |
| 252 | */ |
| 253 | ; |
| 254 | } else { |
| 255 | ret = coresight_enable_link(cd); |
| 256 | } |
| 257 | if (ret) |
| 258 | goto err; |
| 259 | } |
| 260 | |
| 261 | return 0; |
| 262 | err: |
| 263 | list_for_each_entry_continue_reverse(cd, path, path_link) { |
| 264 | if (cd == list_first_entry(path, struct coresight_device, |
| 265 | path_link)) { |
| 266 | coresight_disable_sink(cd); |
| 267 | } else if (list_is_last(&cd->path_link, path)) { |
| 268 | ; |
| 269 | } else { |
| 270 | coresight_disable_link(cd); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | return ret; |
| 275 | } |
| 276 | |
| 277 | static int coresight_disable_path(struct list_head *path) |
| 278 | { |
| 279 | struct coresight_device *cd; |
| 280 | |
| 281 | list_for_each_entry_reverse(cd, path, path_link) { |
| 282 | if (cd == list_first_entry(path, struct coresight_device, |
| 283 | path_link)) { |
| 284 | coresight_disable_sink(cd); |
| 285 | } else if (list_is_last(&cd->path_link, path)) { |
| 286 | /* |
| 287 | * The source has already been stopped, no need |
| 288 | * to do it again here. |
| 289 | */ |
| 290 | ; |
| 291 | } else { |
| 292 | coresight_disable_link(cd); |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static int coresight_build_paths(struct coresight_device *csdev, |
| 300 | struct list_head *path, |
| 301 | bool enable) |
| 302 | { |
| 303 | int i, ret = -EINVAL; |
| 304 | struct coresight_connection *conn; |
| 305 | |
| 306 | list_add(&csdev->path_link, path); |
| 307 | |
| 308 | if (csdev->type == CORESIGHT_DEV_TYPE_SINK && csdev->activated) { |
| 309 | if (enable) |
| 310 | ret = coresight_enable_path(path); |
| 311 | else |
| 312 | ret = coresight_disable_path(path); |
| 313 | } else { |
| 314 | for (i = 0; i < csdev->nr_outport; i++) { |
| 315 | conn = &csdev->conns[i]; |
| 316 | if (coresight_build_paths(conn->child_dev, |
| 317 | path, enable) == 0) |
| 318 | ret = 0; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | if (list_first_entry(path, struct coresight_device, path_link) != csdev) |
| 323 | dev_err(&csdev->dev, "wrong device in %s\n", __func__); |
| 324 | |
| 325 | list_del(&csdev->path_link); |
| 326 | |
| 327 | return ret; |
| 328 | } |
| 329 | |
| 330 | int coresight_enable(struct coresight_device *csdev) |
| 331 | { |
| 332 | int ret = 0; |
| 333 | LIST_HEAD(path); |
| 334 | |
| 335 | mutex_lock(&coresight_mutex); |
| 336 | if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) { |
| 337 | ret = -EINVAL; |
| 338 | dev_err(&csdev->dev, "wrong device type in %s\n", __func__); |
| 339 | goto out; |
| 340 | } |
| 341 | if (csdev->enable) |
| 342 | goto out; |
| 343 | |
| 344 | if (coresight_build_paths(csdev, &path, true)) { |
| 345 | dev_err(&csdev->dev, "building path(s) failed\n"); |
| 346 | goto out; |
| 347 | } |
| 348 | |
| 349 | if (coresight_enable_source(csdev)) |
| 350 | dev_err(&csdev->dev, "source enable failed\n"); |
| 351 | out: |
| 352 | mutex_unlock(&coresight_mutex); |
| 353 | return ret; |
| 354 | } |
| 355 | EXPORT_SYMBOL_GPL(coresight_enable); |
| 356 | |
| 357 | void coresight_disable(struct coresight_device *csdev) |
| 358 | { |
| 359 | LIST_HEAD(path); |
| 360 | |
| 361 | mutex_lock(&coresight_mutex); |
| 362 | if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) { |
| 363 | dev_err(&csdev->dev, "wrong device type in %s\n", __func__); |
| 364 | goto out; |
| 365 | } |
| 366 | if (!csdev->enable) |
| 367 | goto out; |
| 368 | |
| 369 | coresight_disable_source(csdev); |
| 370 | if (coresight_build_paths(csdev, &path, false)) |
| 371 | dev_err(&csdev->dev, "releasing path(s) failed\n"); |
| 372 | |
| 373 | out: |
| 374 | mutex_unlock(&coresight_mutex); |
| 375 | } |
| 376 | EXPORT_SYMBOL_GPL(coresight_disable); |
| 377 | |
| 378 | static ssize_t enable_sink_show(struct device *dev, |
| 379 | struct device_attribute *attr, char *buf) |
| 380 | { |
| 381 | struct coresight_device *csdev = to_coresight_device(dev); |
| 382 | |
| 383 | return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned)csdev->activated); |
| 384 | } |
| 385 | |
| 386 | static ssize_t enable_sink_store(struct device *dev, |
| 387 | struct device_attribute *attr, |
| 388 | const char *buf, size_t size) |
| 389 | { |
| 390 | int ret; |
| 391 | unsigned long val; |
| 392 | struct coresight_device *csdev = to_coresight_device(dev); |
| 393 | |
| 394 | ret = kstrtoul(buf, 10, &val); |
| 395 | if (ret) |
| 396 | return ret; |
| 397 | |
| 398 | if (val) |
| 399 | csdev->activated = true; |
| 400 | else |
| 401 | csdev->activated = false; |
| 402 | |
| 403 | return size; |
| 404 | |
| 405 | } |
| 406 | static DEVICE_ATTR_RW(enable_sink); |
| 407 | |
| 408 | static ssize_t enable_source_show(struct device *dev, |
| 409 | struct device_attribute *attr, char *buf) |
| 410 | { |
| 411 | struct coresight_device *csdev = to_coresight_device(dev); |
| 412 | |
| 413 | return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned)csdev->enable); |
| 414 | } |
| 415 | |
| 416 | static ssize_t enable_source_store(struct device *dev, |
| 417 | struct device_attribute *attr, |
| 418 | const char *buf, size_t size) |
| 419 | { |
| 420 | int ret = 0; |
| 421 | unsigned long val; |
| 422 | struct coresight_device *csdev = to_coresight_device(dev); |
| 423 | |
| 424 | ret = kstrtoul(buf, 10, &val); |
| 425 | if (ret) |
| 426 | return ret; |
| 427 | |
| 428 | if (val) { |
| 429 | ret = coresight_enable(csdev); |
| 430 | if (ret) |
| 431 | return ret; |
| 432 | } else { |
| 433 | coresight_disable(csdev); |
| 434 | } |
| 435 | |
| 436 | return size; |
| 437 | } |
| 438 | static DEVICE_ATTR_RW(enable_source); |
| 439 | |
| 440 | static struct attribute *coresight_sink_attrs[] = { |
| 441 | &dev_attr_enable_sink.attr, |
| 442 | NULL, |
| 443 | }; |
| 444 | ATTRIBUTE_GROUPS(coresight_sink); |
| 445 | |
| 446 | static struct attribute *coresight_source_attrs[] = { |
| 447 | &dev_attr_enable_source.attr, |
| 448 | NULL, |
| 449 | }; |
| 450 | ATTRIBUTE_GROUPS(coresight_source); |
| 451 | |
| 452 | static struct device_type coresight_dev_type[] = { |
| 453 | { |
| 454 | .name = "none", |
| 455 | }, |
| 456 | { |
| 457 | .name = "sink", |
| 458 | .groups = coresight_sink_groups, |
| 459 | }, |
| 460 | { |
| 461 | .name = "link", |
| 462 | }, |
| 463 | { |
| 464 | .name = "linksink", |
| 465 | .groups = coresight_sink_groups, |
| 466 | }, |
| 467 | { |
| 468 | .name = "source", |
| 469 | .groups = coresight_source_groups, |
| 470 | }, |
| 471 | }; |
| 472 | |
| 473 | static void coresight_device_release(struct device *dev) |
| 474 | { |
| 475 | struct coresight_device *csdev = to_coresight_device(dev); |
| 476 | |
| 477 | kfree(csdev); |
| 478 | } |
| 479 | |
| 480 | static int coresight_orphan_match(struct device *dev, void *data) |
| 481 | { |
| 482 | int i; |
| 483 | bool still_orphan = false; |
| 484 | struct coresight_device *csdev, *i_csdev; |
| 485 | struct coresight_connection *conn; |
| 486 | |
| 487 | csdev = data; |
| 488 | i_csdev = to_coresight_device(dev); |
| 489 | |
| 490 | /* No need to check oneself */ |
| 491 | if (csdev == i_csdev) |
| 492 | return 0; |
| 493 | |
| 494 | /* Move on to another component if no connection is orphan */ |
| 495 | if (!i_csdev->orphan) |
| 496 | return 0; |
| 497 | /* |
| 498 | * Circle throuch all the connection of that component. If we find |
| 499 | * an orphan connection whose name matches @csdev, link it. |
| 500 | */ |
| 501 | for (i = 0; i < i_csdev->nr_outport; i++) { |
| 502 | conn = &i_csdev->conns[i]; |
| 503 | |
| 504 | /* We have found at least one orphan connection */ |
| 505 | if (conn->child_dev == NULL) { |
| 506 | /* Does it match this newly added device? */ |
| 507 | if (!strcmp(dev_name(&csdev->dev), conn->child_name)) |
| 508 | conn->child_dev = csdev; |
| 509 | } else { |
| 510 | /* Too bad, this component still has an orphan */ |
| 511 | still_orphan = true; |
| 512 | } |
| 513 | } |
| 514 | |
| 515 | i_csdev->orphan = still_orphan; |
| 516 | |
| 517 | /* |
| 518 | * Returning '0' ensures that all known component on the |
| 519 | * bus will be checked. |
| 520 | */ |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | static void coresight_fixup_orphan_conns(struct coresight_device *csdev) |
| 525 | { |
| 526 | /* |
| 527 | * No need to check for a return value as orphan connection(s) |
| 528 | * are hooked-up with each newly added component. |
| 529 | */ |
| 530 | bus_for_each_dev(&coresight_bustype, NULL, |
| 531 | csdev, coresight_orphan_match); |
| 532 | } |
| 533 | |
| 534 | |
| 535 | static int coresight_name_match(struct device *dev, void *data) |
| 536 | { |
| 537 | char *to_match; |
| 538 | struct coresight_device *i_csdev; |
| 539 | |
| 540 | to_match = data; |
| 541 | i_csdev = to_coresight_device(dev); |
| 542 | |
| 543 | if (!strcmp(to_match, dev_name(&i_csdev->dev))) |
| 544 | return 1; |
| 545 | |
| 546 | return 0; |
| 547 | } |
| 548 | |
| 549 | static void coresight_fixup_device_conns(struct coresight_device *csdev) |
| 550 | { |
| 551 | int i; |
| 552 | struct device *dev = NULL; |
| 553 | struct coresight_connection *conn; |
| 554 | |
| 555 | for (i = 0; i < csdev->nr_outport; i++) { |
| 556 | conn = &csdev->conns[i]; |
| 557 | dev = bus_find_device(&coresight_bustype, NULL, |
| 558 | (void *)conn->child_name, |
| 559 | coresight_name_match); |
| 560 | |
| 561 | if (dev) { |
| 562 | conn->child_dev = to_coresight_device(dev); |
| 563 | } else { |
| 564 | csdev->orphan = true; |
| 565 | conn->child_dev = NULL; |
| 566 | } |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | * coresight_timeout - loop until a bit has changed to a specific state. |
| 572 | * @addr: base address of the area of interest. |
| 573 | * @offset: address of a register, starting from @addr. |
| 574 | * @position: the position of the bit of interest. |
| 575 | * @value: the value the bit should have. |
| 576 | * |
| 577 | * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if |
| 578 | * TIMEOUT_US has elapsed, which ever happens first. |
| 579 | */ |
| 580 | |
| 581 | int coresight_timeout(void __iomem *addr, u32 offset, int position, int value) |
| 582 | { |
| 583 | int i; |
| 584 | u32 val; |
| 585 | |
| 586 | for (i = TIMEOUT_US; i > 0; i--) { |
| 587 | val = __raw_readl(addr + offset); |
| 588 | /* waiting on the bit to go from 0 to 1 */ |
| 589 | if (value) { |
| 590 | if (val & BIT(position)) |
| 591 | return 0; |
| 592 | /* waiting on the bit to go from 1 to 0 */ |
| 593 | } else { |
| 594 | if (!(val & BIT(position))) |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * Delay is arbitrary - the specification doesn't say how long |
| 600 | * we are expected to wait. Extra check required to make sure |
| 601 | * we don't wait needlessly on the last iteration. |
| 602 | */ |
| 603 | if (i - 1) |
| 604 | udelay(1); |
| 605 | } |
| 606 | |
| 607 | return -EAGAIN; |
| 608 | } |
| 609 | |
| 610 | struct bus_type coresight_bustype = { |
| 611 | .name = "coresight", |
| 612 | }; |
| 613 | |
| 614 | static int __init coresight_init(void) |
| 615 | { |
| 616 | return bus_register(&coresight_bustype); |
| 617 | } |
| 618 | postcore_initcall(coresight_init); |
| 619 | |
| 620 | struct coresight_device *coresight_register(struct coresight_desc *desc) |
| 621 | { |
| 622 | int i; |
| 623 | int ret; |
| 624 | int link_subtype; |
| 625 | int nr_refcnts = 1; |
| 626 | atomic_t *refcnts = NULL; |
| 627 | struct coresight_device *csdev; |
| 628 | struct coresight_connection *conns; |
| 629 | |
| 630 | csdev = kzalloc(sizeof(*csdev), GFP_KERNEL); |
| 631 | if (!csdev) { |
| 632 | ret = -ENOMEM; |
| 633 | goto err_kzalloc_csdev; |
| 634 | } |
| 635 | |
| 636 | if (desc->type == CORESIGHT_DEV_TYPE_LINK || |
| 637 | desc->type == CORESIGHT_DEV_TYPE_LINKSINK) { |
| 638 | link_subtype = desc->subtype.link_subtype; |
| 639 | |
| 640 | if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) |
| 641 | nr_refcnts = desc->pdata->nr_inport; |
| 642 | else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) |
| 643 | nr_refcnts = desc->pdata->nr_outport; |
| 644 | } |
| 645 | |
| 646 | refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL); |
| 647 | if (!refcnts) { |
| 648 | ret = -ENOMEM; |
| 649 | goto err_kzalloc_refcnts; |
| 650 | } |
| 651 | |
| 652 | csdev->refcnt = refcnts; |
| 653 | |
| 654 | csdev->nr_inport = desc->pdata->nr_inport; |
| 655 | csdev->nr_outport = desc->pdata->nr_outport; |
| 656 | conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL); |
| 657 | if (!conns) { |
| 658 | ret = -ENOMEM; |
| 659 | goto err_kzalloc_conns; |
| 660 | } |
| 661 | |
| 662 | for (i = 0; i < csdev->nr_outport; i++) { |
| 663 | conns[i].outport = desc->pdata->outports[i]; |
| 664 | conns[i].child_name = desc->pdata->child_names[i]; |
| 665 | conns[i].child_port = desc->pdata->child_ports[i]; |
| 666 | } |
| 667 | |
| 668 | csdev->conns = conns; |
| 669 | |
| 670 | csdev->type = desc->type; |
| 671 | csdev->subtype = desc->subtype; |
| 672 | csdev->ops = desc->ops; |
| 673 | csdev->orphan = false; |
| 674 | |
| 675 | csdev->dev.type = &coresight_dev_type[desc->type]; |
| 676 | csdev->dev.groups = desc->groups; |
| 677 | csdev->dev.parent = desc->dev; |
| 678 | csdev->dev.release = coresight_device_release; |
| 679 | csdev->dev.bus = &coresight_bustype; |
| 680 | dev_set_name(&csdev->dev, "%s", desc->pdata->name); |
| 681 | |
| 682 | ret = device_register(&csdev->dev); |
| 683 | if (ret) |
| 684 | goto err_device_register; |
| 685 | |
| 686 | mutex_lock(&coresight_mutex); |
| 687 | |
| 688 | coresight_fixup_device_conns(csdev); |
| 689 | coresight_fixup_orphan_conns(csdev); |
| 690 | |
| 691 | mutex_unlock(&coresight_mutex); |
| 692 | |
| 693 | return csdev; |
| 694 | |
| 695 | err_device_register: |
| 696 | kfree(conns); |
| 697 | err_kzalloc_conns: |
| 698 | kfree(refcnts); |
| 699 | err_kzalloc_refcnts: |
| 700 | kfree(csdev); |
| 701 | err_kzalloc_csdev: |
| 702 | return ERR_PTR(ret); |
| 703 | } |
| 704 | EXPORT_SYMBOL_GPL(coresight_register); |
| 705 | |
| 706 | void coresight_unregister(struct coresight_device *csdev) |
| 707 | { |
| 708 | mutex_lock(&coresight_mutex); |
| 709 | |
| 710 | kfree(csdev->conns); |
| 711 | device_unregister(&csdev->dev); |
| 712 | |
| 713 | mutex_unlock(&coresight_mutex); |
| 714 | } |
| 715 | EXPORT_SYMBOL_GPL(coresight_unregister); |
| 716 | |
| 717 | MODULE_LICENSE("GPL v2"); |