1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2018 Linaro Limited, All rights reserved. 4 * Author: Mike Leach <mike.leach@linaro.org> 5 */ 6 7 #include <linux/amba/bus.h> 8 #include <linux/atomic.h> 9 #include <linux/bits.h> 10 #include <linux/coresight.h> 11 #include <linux/cpu_pm.h> 12 #include <linux/cpuhotplug.h> 13 #include <linux/device.h> 14 #include <linux/io.h> 15 #include <linux/kernel.h> 16 #include <linux/list.h> 17 #include <linux/mutex.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/property.h> 20 #include <linux/spinlock.h> 21 22 #include "coresight-priv.h" 23 #include "coresight-cti.h" 24 25 /** 26 * CTI devices can be associated with a PE, or be connected to CoreSight 27 * hardware. We have a list of all CTIs irrespective of CPU bound or 28 * otherwise. 29 * 30 * We assume that the non-CPU CTIs are always powered as we do with sinks etc. 31 * 32 * We leave the client to figure out if all the CTIs are interconnected with 33 * the same CTM, in general this is the case but does not always have to be. 34 */ 35 36 /* net of CTI devices connected via CTM */ 37 static LIST_HEAD(ect_net); 38 39 /* protect the list */ 40 static DEFINE_MUTEX(ect_mutex); 41 42 #define csdev_to_cti_drvdata(csdev) \ 43 dev_get_drvdata(csdev->dev.parent) 44 45 /* power management handling */ 46 static int nr_cti_cpu; 47 48 /* quick lookup list for CPU bound CTIs when power handling */ 49 static struct cti_drvdata *cti_cpu_drvdata[NR_CPUS]; 50 51 /* 52 * CTI naming. CTI bound to cores will have the name cti_cpu<N> where 53 * N is the CPU ID. System CTIs will have the name cti_sys<I> where I 54 * is an index allocated by order of discovery. 55 * 56 * CTI device name list - for CTI not bound to cores. 57 */ 58 DEFINE_CORESIGHT_DEVLIST(cti_sys_devs, "cti_sys"); 59 60 /* write set of regs to hardware - call with spinlock claimed */ 61 void cti_write_all_hw_regs(struct cti_drvdata *drvdata) 62 { 63 struct cti_config *config = &drvdata->config; 64 int i; 65 66 CS_UNLOCK(drvdata->base); 67 68 /* disable CTI before writing registers */ 69 writel_relaxed(0, drvdata->base + CTICONTROL); 70 71 /* write the CTI trigger registers */ 72 for (i = 0; i < config->nr_trig_max; i++) { 73 writel_relaxed(config->ctiinen[i], drvdata->base + CTIINEN(i)); 74 writel_relaxed(config->ctiouten[i], 75 drvdata->base + CTIOUTEN(i)); 76 } 77 78 /* other regs */ 79 writel_relaxed(config->ctigate, drvdata->base + CTIGATE); 80 writel_relaxed(config->asicctl, drvdata->base + ASICCTL); 81 writel_relaxed(config->ctiappset, drvdata->base + CTIAPPSET); 82 83 /* re-enable CTI */ 84 writel_relaxed(1, drvdata->base + CTICONTROL); 85 86 CS_LOCK(drvdata->base); 87 } 88 89 /* write regs to hardware and enable */ 90 static int cti_enable_hw(struct cti_drvdata *drvdata) 91 { 92 struct cti_config *config = &drvdata->config; 93 unsigned long flags; 94 int rc = 0; 95 96 spin_lock_irqsave(&drvdata->spinlock, flags); 97 98 /* no need to do anything if enabled or unpowered*/ 99 if (config->hw_enabled || !config->hw_powered) 100 goto cti_state_unchanged; 101 102 /* claim the device */ 103 rc = coresight_claim_device(drvdata->csdev); 104 if (rc) 105 goto cti_err_not_enabled; 106 107 cti_write_all_hw_regs(drvdata); 108 109 config->hw_enabled = true; 110 drvdata->config.enable_req_count++; 111 spin_unlock_irqrestore(&drvdata->spinlock, flags); 112 return rc; 113 114 cti_state_unchanged: 115 drvdata->config.enable_req_count++; 116 117 /* cannot enable due to error */ 118 cti_err_not_enabled: 119 spin_unlock_irqrestore(&drvdata->spinlock, flags); 120 return rc; 121 } 122 123 /* re-enable CTI on CPU when using CPU hotplug */ 124 static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata) 125 { 126 struct cti_config *config = &drvdata->config; 127 128 spin_lock(&drvdata->spinlock); 129 config->hw_powered = true; 130 131 /* no need to do anything if no enable request */ 132 if (!drvdata->config.enable_req_count) 133 goto cti_hp_not_enabled; 134 135 /* try to claim the device */ 136 if (coresight_claim_device(drvdata->csdev)) 137 goto cti_hp_not_enabled; 138 139 cti_write_all_hw_regs(drvdata); 140 config->hw_enabled = true; 141 spin_unlock(&drvdata->spinlock); 142 return; 143 144 /* did not re-enable due to no claim / no request */ 145 cti_hp_not_enabled: 146 spin_unlock(&drvdata->spinlock); 147 } 148 149 /* disable hardware */ 150 static int cti_disable_hw(struct cti_drvdata *drvdata) 151 { 152 struct cti_config *config = &drvdata->config; 153 struct coresight_device *csdev = drvdata->csdev; 154 int ret = 0; 155 156 spin_lock(&drvdata->spinlock); 157 158 /* don't allow negative refcounts, return an error */ 159 if (!drvdata->config.enable_req_count) { 160 ret = -EINVAL; 161 goto cti_not_disabled; 162 } 163 164 /* check refcount - disable on 0 */ 165 if (--drvdata->config.enable_req_count > 0) 166 goto cti_not_disabled; 167 168 /* no need to do anything if disabled or cpu unpowered */ 169 if (!config->hw_enabled || !config->hw_powered) 170 goto cti_not_disabled; 171 172 CS_UNLOCK(drvdata->base); 173 174 /* disable CTI */ 175 writel_relaxed(0, drvdata->base + CTICONTROL); 176 config->hw_enabled = false; 177 178 coresight_disclaim_device_unlocked(csdev); 179 CS_LOCK(drvdata->base); 180 spin_unlock(&drvdata->spinlock); 181 return ret; 182 183 /* not disabled this call */ 184 cti_not_disabled: 185 spin_unlock(&drvdata->spinlock); 186 return ret; 187 } 188 189 void cti_write_single_reg(struct cti_drvdata *drvdata, int offset, u32 value) 190 { 191 CS_UNLOCK(drvdata->base); 192 writel_relaxed(value, drvdata->base + offset); 193 CS_LOCK(drvdata->base); 194 } 195 196 void cti_write_intack(struct device *dev, u32 ackval) 197 { 198 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent); 199 struct cti_config *config = &drvdata->config; 200 201 spin_lock(&drvdata->spinlock); 202 /* write if enabled */ 203 if (cti_active(config)) 204 cti_write_single_reg(drvdata, CTIINTACK, ackval); 205 spin_unlock(&drvdata->spinlock); 206 } 207 208 /* 209 * Look at the HW DEVID register for some of the HW settings. 210 * DEVID[15:8] - max number of in / out triggers. 211 */ 212 #define CTI_DEVID_MAXTRIGS(devid_val) ((int) BMVAL(devid_val, 8, 15)) 213 214 /* DEVID[19:16] - number of CTM channels */ 215 #define CTI_DEVID_CTMCHANNELS(devid_val) ((int) BMVAL(devid_val, 16, 19)) 216 217 static void cti_set_default_config(struct device *dev, 218 struct cti_drvdata *drvdata) 219 { 220 struct cti_config *config = &drvdata->config; 221 u32 devid; 222 223 devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID); 224 config->nr_trig_max = CTI_DEVID_MAXTRIGS(devid); 225 226 /* 227 * no current hardware should exceed this, but protect the driver 228 * in case of fault / out of spec hw 229 */ 230 if (config->nr_trig_max > CTIINOUTEN_MAX) { 231 dev_warn_once(dev, 232 "Limiting HW MaxTrig value(%d) to driver max(%d)\n", 233 config->nr_trig_max, CTIINOUTEN_MAX); 234 config->nr_trig_max = CTIINOUTEN_MAX; 235 } 236 237 config->nr_ctm_channels = CTI_DEVID_CTMCHANNELS(devid); 238 239 /* Most regs default to 0 as zalloc'ed except...*/ 240 config->trig_filter_enable = true; 241 config->ctigate = GENMASK(config->nr_ctm_channels - 1, 0); 242 config->enable_req_count = 0; 243 } 244 245 /* 246 * Add a connection entry to the list of connections for this 247 * CTI device. 248 */ 249 int cti_add_connection_entry(struct device *dev, struct cti_drvdata *drvdata, 250 struct cti_trig_con *tc, 251 struct coresight_device *csdev, 252 const char *assoc_dev_name) 253 { 254 struct cti_device *cti_dev = &drvdata->ctidev; 255 256 tc->con_dev = csdev; 257 /* 258 * Prefer actual associated CS device dev name to supplied value - 259 * which is likely to be node name / other conn name. 260 */ 261 if (csdev) 262 tc->con_dev_name = dev_name(&csdev->dev); 263 else if (assoc_dev_name != NULL) { 264 tc->con_dev_name = devm_kstrdup(dev, 265 assoc_dev_name, GFP_KERNEL); 266 if (!tc->con_dev_name) 267 return -ENOMEM; 268 } 269 list_add_tail(&tc->node, &cti_dev->trig_cons); 270 cti_dev->nr_trig_con++; 271 272 /* add connection usage bit info to overall info */ 273 drvdata->config.trig_in_use |= tc->con_in->used_mask; 274 drvdata->config.trig_out_use |= tc->con_out->used_mask; 275 276 return 0; 277 } 278 279 /* create a trigger connection with appropriately sized signal groups */ 280 struct cti_trig_con *cti_allocate_trig_con(struct device *dev, int in_sigs, 281 int out_sigs) 282 { 283 struct cti_trig_con *tc = NULL; 284 struct cti_trig_grp *in = NULL, *out = NULL; 285 286 tc = devm_kzalloc(dev, sizeof(struct cti_trig_con), GFP_KERNEL); 287 if (!tc) 288 return tc; 289 290 in = devm_kzalloc(dev, 291 offsetof(struct cti_trig_grp, sig_types[in_sigs]), 292 GFP_KERNEL); 293 if (!in) 294 return NULL; 295 296 out = devm_kzalloc(dev, 297 offsetof(struct cti_trig_grp, sig_types[out_sigs]), 298 GFP_KERNEL); 299 if (!out) 300 return NULL; 301 302 tc->con_in = in; 303 tc->con_out = out; 304 tc->con_in->nr_sigs = in_sigs; 305 tc->con_out->nr_sigs = out_sigs; 306 return tc; 307 } 308 309 /* 310 * Add a default connection if nothing else is specified. 311 * single connection based on max in/out info, no assoc device 312 */ 313 int cti_add_default_connection(struct device *dev, struct cti_drvdata *drvdata) 314 { 315 int ret = 0; 316 int n_trigs = drvdata->config.nr_trig_max; 317 u32 n_trig_mask = GENMASK(n_trigs - 1, 0); 318 struct cti_trig_con *tc = NULL; 319 320 /* 321 * Assume max trigs for in and out, 322 * all used, default sig types allocated 323 */ 324 tc = cti_allocate_trig_con(dev, n_trigs, n_trigs); 325 if (!tc) 326 return -ENOMEM; 327 328 tc->con_in->used_mask = n_trig_mask; 329 tc->con_out->used_mask = n_trig_mask; 330 ret = cti_add_connection_entry(dev, drvdata, tc, NULL, "default"); 331 return ret; 332 } 333 334 /** cti channel api **/ 335 /* attach/detach channel from trigger - write through if enabled. */ 336 int cti_channel_trig_op(struct device *dev, enum cti_chan_op op, 337 enum cti_trig_dir direction, u32 channel_idx, 338 u32 trigger_idx) 339 { 340 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent); 341 struct cti_config *config = &drvdata->config; 342 u32 trig_bitmask; 343 u32 chan_bitmask; 344 u32 reg_value; 345 int reg_offset; 346 347 /* ensure indexes in range */ 348 if ((channel_idx >= config->nr_ctm_channels) || 349 (trigger_idx >= config->nr_trig_max)) 350 return -EINVAL; 351 352 trig_bitmask = BIT(trigger_idx); 353 354 /* ensure registered triggers and not out filtered */ 355 if (direction == CTI_TRIG_IN) { 356 if (!(trig_bitmask & config->trig_in_use)) 357 return -EINVAL; 358 } else { 359 if (!(trig_bitmask & config->trig_out_use)) 360 return -EINVAL; 361 362 if ((config->trig_filter_enable) && 363 (config->trig_out_filter & trig_bitmask)) 364 return -EINVAL; 365 } 366 367 /* update the local register values */ 368 chan_bitmask = BIT(channel_idx); 369 reg_offset = (direction == CTI_TRIG_IN ? CTIINEN(trigger_idx) : 370 CTIOUTEN(trigger_idx)); 371 372 spin_lock(&drvdata->spinlock); 373 374 /* read - modify write - the trigger / channel enable value */ 375 reg_value = direction == CTI_TRIG_IN ? config->ctiinen[trigger_idx] : 376 config->ctiouten[trigger_idx]; 377 if (op == CTI_CHAN_ATTACH) 378 reg_value |= chan_bitmask; 379 else 380 reg_value &= ~chan_bitmask; 381 382 /* write local copy */ 383 if (direction == CTI_TRIG_IN) 384 config->ctiinen[trigger_idx] = reg_value; 385 else 386 config->ctiouten[trigger_idx] = reg_value; 387 388 /* write through if enabled */ 389 if (cti_active(config)) 390 cti_write_single_reg(drvdata, reg_offset, reg_value); 391 spin_unlock(&drvdata->spinlock); 392 return 0; 393 } 394 395 int cti_channel_gate_op(struct device *dev, enum cti_chan_gate_op op, 396 u32 channel_idx) 397 { 398 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent); 399 struct cti_config *config = &drvdata->config; 400 u32 chan_bitmask; 401 u32 reg_value; 402 int err = 0; 403 404 if (channel_idx >= config->nr_ctm_channels) 405 return -EINVAL; 406 407 chan_bitmask = BIT(channel_idx); 408 409 spin_lock(&drvdata->spinlock); 410 reg_value = config->ctigate; 411 switch (op) { 412 case CTI_GATE_CHAN_ENABLE: 413 reg_value |= chan_bitmask; 414 break; 415 416 case CTI_GATE_CHAN_DISABLE: 417 reg_value &= ~chan_bitmask; 418 break; 419 420 default: 421 err = -EINVAL; 422 break; 423 } 424 if (err == 0) { 425 config->ctigate = reg_value; 426 if (cti_active(config)) 427 cti_write_single_reg(drvdata, CTIGATE, reg_value); 428 } 429 spin_unlock(&drvdata->spinlock); 430 return err; 431 } 432 433 int cti_channel_setop(struct device *dev, enum cti_chan_set_op op, 434 u32 channel_idx) 435 { 436 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent); 437 struct cti_config *config = &drvdata->config; 438 u32 chan_bitmask; 439 u32 reg_value; 440 u32 reg_offset; 441 int err = 0; 442 443 if (channel_idx >= config->nr_ctm_channels) 444 return -EINVAL; 445 446 chan_bitmask = BIT(channel_idx); 447 448 spin_lock(&drvdata->spinlock); 449 reg_value = config->ctiappset; 450 switch (op) { 451 case CTI_CHAN_SET: 452 config->ctiappset |= chan_bitmask; 453 reg_value = config->ctiappset; 454 reg_offset = CTIAPPSET; 455 break; 456 457 case CTI_CHAN_CLR: 458 config->ctiappset &= ~chan_bitmask; 459 reg_value = chan_bitmask; 460 reg_offset = CTIAPPCLEAR; 461 break; 462 463 case CTI_CHAN_PULSE: 464 config->ctiappset &= ~chan_bitmask; 465 reg_value = chan_bitmask; 466 reg_offset = CTIAPPPULSE; 467 break; 468 469 default: 470 err = -EINVAL; 471 break; 472 } 473 474 if ((err == 0) && cti_active(config)) 475 cti_write_single_reg(drvdata, reg_offset, reg_value); 476 spin_unlock(&drvdata->spinlock); 477 478 return err; 479 } 480 481 static bool cti_add_sysfs_link(struct cti_drvdata *drvdata, 482 struct cti_trig_con *tc) 483 { 484 struct coresight_sysfs_link link_info; 485 int link_err = 0; 486 487 link_info.orig = drvdata->csdev; 488 link_info.orig_name = tc->con_dev_name; 489 link_info.target = tc->con_dev; 490 link_info.target_name = dev_name(&drvdata->csdev->dev); 491 492 link_err = coresight_add_sysfs_link(&link_info); 493 if (link_err) 494 dev_warn(&drvdata->csdev->dev, 495 "Failed to set CTI sysfs link %s<=>%s\n", 496 link_info.orig_name, link_info.target_name); 497 return !link_err; 498 } 499 500 static void cti_remove_sysfs_link(struct cti_drvdata *drvdata, 501 struct cti_trig_con *tc) 502 { 503 struct coresight_sysfs_link link_info; 504 505 link_info.orig = drvdata->csdev; 506 link_info.orig_name = tc->con_dev_name; 507 link_info.target = tc->con_dev; 508 link_info.target_name = dev_name(&drvdata->csdev->dev); 509 coresight_remove_sysfs_link(&link_info); 510 } 511 512 /* 513 * Look for a matching connection device name in the list of connections. 514 * If found then swap in the csdev name, set trig con association pointer 515 * and return found. 516 */ 517 static bool 518 cti_match_fixup_csdev(struct cti_device *ctidev, const char *node_name, 519 struct coresight_device *csdev) 520 { 521 struct cti_trig_con *tc; 522 struct cti_drvdata *drvdata = container_of(ctidev, struct cti_drvdata, 523 ctidev); 524 525 list_for_each_entry(tc, &ctidev->trig_cons, node) { 526 if (tc->con_dev_name) { 527 if (!strcmp(node_name, tc->con_dev_name)) { 528 /* match: so swap in csdev name & dev */ 529 tc->con_dev_name = dev_name(&csdev->dev); 530 tc->con_dev = csdev; 531 /* try to set sysfs link */ 532 if (cti_add_sysfs_link(drvdata, tc)) 533 return true; 534 /* link failed - remove CTI reference */ 535 tc->con_dev = NULL; 536 break; 537 } 538 } 539 } 540 return false; 541 } 542 543 /* 544 * Search the cti list to add an associated CTI into the supplied CS device 545 * This will set the association if CTI declared before the CS device. 546 * (called from coresight_register() without coresight_mutex locked). 547 */ 548 static void cti_add_assoc_to_csdev(struct coresight_device *csdev) 549 { 550 struct cti_drvdata *ect_item; 551 struct cti_device *ctidev; 552 const char *node_name = NULL; 553 554 /* protect the list */ 555 mutex_lock(&ect_mutex); 556 557 /* exit if current is an ECT device.*/ 558 if ((csdev->type == CORESIGHT_DEV_TYPE_ECT) || list_empty(&ect_net)) 559 goto cti_add_done; 560 561 /* if we didn't find the csdev previously we used the fwnode name */ 562 node_name = cti_plat_get_node_name(dev_fwnode(csdev->dev.parent)); 563 if (!node_name) 564 goto cti_add_done; 565 566 /* for each CTI in list... */ 567 list_for_each_entry(ect_item, &ect_net, node) { 568 ctidev = &ect_item->ctidev; 569 if (cti_match_fixup_csdev(ctidev, node_name, csdev)) { 570 /* 571 * if we found a matching csdev then update the ECT 572 * association pointer for the device with this CTI. 573 */ 574 coresight_set_assoc_ectdev_mutex(csdev, 575 ect_item->csdev); 576 break; 577 } 578 } 579 cti_add_done: 580 mutex_unlock(&ect_mutex); 581 } 582 583 /* 584 * Removing the associated devices is easier. 585 * A CTI will not have a value for csdev->ect_dev. 586 */ 587 static void cti_remove_assoc_from_csdev(struct coresight_device *csdev) 588 { 589 struct cti_drvdata *ctidrv; 590 struct cti_trig_con *tc; 591 struct cti_device *ctidev; 592 593 mutex_lock(&ect_mutex); 594 if (csdev->ect_dev) { 595 ctidrv = csdev_to_cti_drvdata(csdev->ect_dev); 596 ctidev = &ctidrv->ctidev; 597 list_for_each_entry(tc, &ctidev->trig_cons, node) { 598 if (tc->con_dev == csdev) { 599 cti_remove_sysfs_link(ctidrv, tc); 600 tc->con_dev = NULL; 601 break; 602 } 603 } 604 csdev->ect_dev = NULL; 605 } 606 mutex_unlock(&ect_mutex); 607 } 608 609 /* 610 * Operations to add and remove associated CTI. 611 * Register to coresight core driver as call back function. 612 */ 613 static struct cti_assoc_op cti_assoc_ops = { 614 .add = cti_add_assoc_to_csdev, 615 .remove = cti_remove_assoc_from_csdev 616 }; 617 618 /* 619 * Update the cross references where the associated device was found 620 * while we were building the connection info. This will occur if the 621 * assoc device was registered before the CTI. 622 */ 623 static void cti_update_conn_xrefs(struct cti_drvdata *drvdata) 624 { 625 struct cti_trig_con *tc; 626 struct cti_device *ctidev = &drvdata->ctidev; 627 628 list_for_each_entry(tc, &ctidev->trig_cons, node) { 629 if (tc->con_dev) { 630 /* if we can set the sysfs link */ 631 if (cti_add_sysfs_link(drvdata, tc)) 632 /* set the CTI/csdev association */ 633 coresight_set_assoc_ectdev_mutex(tc->con_dev, 634 drvdata->csdev); 635 else 636 /* otherwise remove reference from CTI */ 637 tc->con_dev = NULL; 638 } 639 } 640 } 641 642 static void cti_remove_conn_xrefs(struct cti_drvdata *drvdata) 643 { 644 struct cti_trig_con *tc; 645 struct cti_device *ctidev = &drvdata->ctidev; 646 647 list_for_each_entry(tc, &ctidev->trig_cons, node) { 648 if (tc->con_dev) { 649 coresight_set_assoc_ectdev_mutex(tc->con_dev, 650 NULL); 651 cti_remove_sysfs_link(drvdata, tc); 652 tc->con_dev = NULL; 653 } 654 } 655 } 656 657 /** cti PM callbacks **/ 658 static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd, 659 void *v) 660 { 661 struct cti_drvdata *drvdata; 662 struct coresight_device *csdev; 663 unsigned int cpu = smp_processor_id(); 664 int notify_res = NOTIFY_OK; 665 666 if (!cti_cpu_drvdata[cpu]) 667 return NOTIFY_OK; 668 669 drvdata = cti_cpu_drvdata[cpu]; 670 csdev = drvdata->csdev; 671 672 if (WARN_ON_ONCE(drvdata->ctidev.cpu != cpu)) 673 return NOTIFY_BAD; 674 675 spin_lock(&drvdata->spinlock); 676 677 switch (cmd) { 678 case CPU_PM_ENTER: 679 /* CTI regs all static - we have a copy & nothing to save */ 680 drvdata->config.hw_powered = false; 681 if (drvdata->config.hw_enabled) 682 coresight_disclaim_device(csdev); 683 break; 684 685 case CPU_PM_ENTER_FAILED: 686 drvdata->config.hw_powered = true; 687 if (drvdata->config.hw_enabled) { 688 if (coresight_claim_device(csdev)) 689 drvdata->config.hw_enabled = false; 690 } 691 break; 692 693 case CPU_PM_EXIT: 694 /* write hardware registers to re-enable. */ 695 drvdata->config.hw_powered = true; 696 drvdata->config.hw_enabled = false; 697 698 /* check enable reference count to enable HW */ 699 if (drvdata->config.enable_req_count) { 700 /* check we can claim the device as we re-power */ 701 if (coresight_claim_device(csdev)) 702 goto cti_notify_exit; 703 704 drvdata->config.hw_enabled = true; 705 cti_write_all_hw_regs(drvdata); 706 } 707 break; 708 709 default: 710 notify_res = NOTIFY_DONE; 711 break; 712 } 713 714 cti_notify_exit: 715 spin_unlock(&drvdata->spinlock); 716 return notify_res; 717 } 718 719 static struct notifier_block cti_cpu_pm_nb = { 720 .notifier_call = cti_cpu_pm_notify, 721 }; 722 723 /* CPU HP handlers */ 724 static int cti_starting_cpu(unsigned int cpu) 725 { 726 struct cti_drvdata *drvdata = cti_cpu_drvdata[cpu]; 727 728 if (!drvdata) 729 return 0; 730 731 cti_cpuhp_enable_hw(drvdata); 732 return 0; 733 } 734 735 static int cti_dying_cpu(unsigned int cpu) 736 { 737 struct cti_drvdata *drvdata = cti_cpu_drvdata[cpu]; 738 739 if (!drvdata) 740 return 0; 741 742 spin_lock(&drvdata->spinlock); 743 drvdata->config.hw_powered = false; 744 if (drvdata->config.hw_enabled) 745 coresight_disclaim_device(drvdata->csdev); 746 spin_unlock(&drvdata->spinlock); 747 return 0; 748 } 749 750 static int cti_pm_setup(struct cti_drvdata *drvdata) 751 { 752 int ret; 753 754 if (drvdata->ctidev.cpu == -1) 755 return 0; 756 757 if (nr_cti_cpu) 758 goto done; 759 760 cpus_read_lock(); 761 ret = cpuhp_setup_state_nocalls_cpuslocked( 762 CPUHP_AP_ARM_CORESIGHT_CTI_STARTING, 763 "arm/coresight_cti:starting", 764 cti_starting_cpu, cti_dying_cpu); 765 if (ret) { 766 cpus_read_unlock(); 767 return ret; 768 } 769 770 ret = cpu_pm_register_notifier(&cti_cpu_pm_nb); 771 cpus_read_unlock(); 772 if (ret) { 773 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_CTI_STARTING); 774 return ret; 775 } 776 777 done: 778 nr_cti_cpu++; 779 cti_cpu_drvdata[drvdata->ctidev.cpu] = drvdata; 780 781 return 0; 782 } 783 784 /* release PM registrations */ 785 static void cti_pm_release(struct cti_drvdata *drvdata) 786 { 787 if (drvdata->ctidev.cpu == -1) 788 return; 789 790 cti_cpu_drvdata[drvdata->ctidev.cpu] = NULL; 791 if (--nr_cti_cpu == 0) { 792 cpu_pm_unregister_notifier(&cti_cpu_pm_nb); 793 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_CTI_STARTING); 794 } 795 } 796 797 /** cti ect operations **/ 798 int cti_enable(struct coresight_device *csdev) 799 { 800 struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev); 801 802 return cti_enable_hw(drvdata); 803 } 804 805 int cti_disable(struct coresight_device *csdev) 806 { 807 struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev); 808 809 return cti_disable_hw(drvdata); 810 } 811 812 static const struct coresight_ops_ect cti_ops_ect = { 813 .enable = cti_enable, 814 .disable = cti_disable, 815 }; 816 817 static const struct coresight_ops cti_ops = { 818 .ect_ops = &cti_ops_ect, 819 }; 820 821 /* 822 * Free up CTI specific resources 823 * called by dev->release, need to call down to underlying csdev release. 824 */ 825 static void cti_device_release(struct device *dev) 826 { 827 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent); 828 struct cti_drvdata *ect_item, *ect_tmp; 829 830 mutex_lock(&ect_mutex); 831 cti_pm_release(drvdata); 832 833 /* remove from the list */ 834 list_for_each_entry_safe(ect_item, ect_tmp, &ect_net, node) { 835 if (ect_item == drvdata) { 836 list_del(&ect_item->node); 837 break; 838 } 839 } 840 mutex_unlock(&ect_mutex); 841 842 if (drvdata->csdev_release) 843 drvdata->csdev_release(dev); 844 } 845 static void cti_remove(struct amba_device *adev) 846 { 847 struct cti_drvdata *drvdata = dev_get_drvdata(&adev->dev); 848 849 mutex_lock(&ect_mutex); 850 cti_remove_conn_xrefs(drvdata); 851 mutex_unlock(&ect_mutex); 852 853 coresight_unregister(drvdata->csdev); 854 } 855 856 static int cti_probe(struct amba_device *adev, const struct amba_id *id) 857 { 858 int ret = 0; 859 void __iomem *base; 860 struct device *dev = &adev->dev; 861 struct cti_drvdata *drvdata = NULL; 862 struct coresight_desc cti_desc; 863 struct coresight_platform_data *pdata = NULL; 864 struct resource *res = &adev->res; 865 866 /* driver data*/ 867 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); 868 if (!drvdata) 869 return -ENOMEM; 870 871 /* Validity for the resource is already checked by the AMBA core */ 872 base = devm_ioremap_resource(dev, res); 873 if (IS_ERR(base)) 874 return PTR_ERR(base); 875 876 drvdata->base = base; 877 cti_desc.access = CSDEV_ACCESS_IOMEM(base); 878 879 dev_set_drvdata(dev, drvdata); 880 881 /* default CTI device info */ 882 drvdata->ctidev.cpu = -1; 883 drvdata->ctidev.nr_trig_con = 0; 884 drvdata->ctidev.ctm_id = 0; 885 INIT_LIST_HEAD(&drvdata->ctidev.trig_cons); 886 887 spin_lock_init(&drvdata->spinlock); 888 889 /* initialise CTI driver config values */ 890 cti_set_default_config(dev, drvdata); 891 892 pdata = coresight_cti_get_platform_data(dev); 893 if (IS_ERR(pdata)) { 894 dev_err(dev, "coresight_cti_get_platform_data err\n"); 895 return PTR_ERR(pdata); 896 } 897 898 /* default to powered - could change on PM notifications */ 899 drvdata->config.hw_powered = true; 900 901 /* set up device name - will depend if cpu bound or otherwise */ 902 if (drvdata->ctidev.cpu >= 0) 903 cti_desc.name = devm_kasprintf(dev, GFP_KERNEL, "cti_cpu%d", 904 drvdata->ctidev.cpu); 905 else 906 cti_desc.name = coresight_alloc_device_name(&cti_sys_devs, dev); 907 if (!cti_desc.name) 908 return -ENOMEM; 909 910 /* setup CPU power management handling for CPU bound CTI devices. */ 911 ret = cti_pm_setup(drvdata); 912 if (ret) 913 return ret; 914 915 /* create dynamic attributes for connections */ 916 ret = cti_create_cons_sysfs(dev, drvdata); 917 if (ret) { 918 dev_err(dev, "%s: create dynamic sysfs entries failed\n", 919 cti_desc.name); 920 goto pm_release; 921 } 922 923 /* set up coresight component description */ 924 cti_desc.pdata = pdata; 925 cti_desc.type = CORESIGHT_DEV_TYPE_ECT; 926 cti_desc.subtype.ect_subtype = CORESIGHT_DEV_SUBTYPE_ECT_CTI; 927 cti_desc.ops = &cti_ops; 928 cti_desc.groups = drvdata->ctidev.con_groups; 929 cti_desc.dev = dev; 930 drvdata->csdev = coresight_register(&cti_desc); 931 if (IS_ERR(drvdata->csdev)) { 932 ret = PTR_ERR(drvdata->csdev); 933 goto pm_release; 934 } 935 936 /* add to list of CTI devices */ 937 mutex_lock(&ect_mutex); 938 list_add(&drvdata->node, &ect_net); 939 /* set any cross references */ 940 cti_update_conn_xrefs(drvdata); 941 mutex_unlock(&ect_mutex); 942 943 /* set up release chain */ 944 drvdata->csdev_release = drvdata->csdev->dev.release; 945 drvdata->csdev->dev.release = cti_device_release; 946 947 /* all done - dec pm refcount */ 948 pm_runtime_put(&adev->dev); 949 dev_info(&drvdata->csdev->dev, "CTI initialized\n"); 950 return 0; 951 952 pm_release: 953 cti_pm_release(drvdata); 954 return ret; 955 } 956 957 static struct amba_cs_uci_id uci_id_cti[] = { 958 { 959 /* CTI UCI data */ 960 .devarch = 0x47701a14, /* CTI v2 */ 961 .devarch_mask = 0xfff0ffff, 962 .devtype = 0x00000014, /* maj(0x4-debug) min(0x1-ECT) */ 963 } 964 }; 965 966 static const struct amba_id cti_ids[] = { 967 CS_AMBA_ID(0x000bb906), /* Coresight CTI (SoC 400), C-A72, C-A57 */ 968 CS_AMBA_ID(0x000bb922), /* CTI - C-A8 */ 969 CS_AMBA_ID(0x000bb9a8), /* CTI - C-A53 */ 970 CS_AMBA_ID(0x000bb9aa), /* CTI - C-A73 */ 971 CS_AMBA_UCI_ID(0x000bb9da, uci_id_cti), /* CTI - C-A35 */ 972 CS_AMBA_UCI_ID(0x000bb9ed, uci_id_cti), /* Coresight CTI (SoC 600) */ 973 { 0, 0}, 974 }; 975 976 MODULE_DEVICE_TABLE(amba, cti_ids); 977 978 static struct amba_driver cti_driver = { 979 .drv = { 980 .name = "coresight-cti", 981 .owner = THIS_MODULE, 982 .suppress_bind_attrs = true, 983 }, 984 .probe = cti_probe, 985 .remove = cti_remove, 986 .id_table = cti_ids, 987 }; 988 989 static int __init cti_init(void) 990 { 991 int ret; 992 993 ret = amba_driver_register(&cti_driver); 994 if (ret) 995 pr_info("Error registering cti driver\n"); 996 coresight_set_cti_ops(&cti_assoc_ops); 997 return ret; 998 } 999 1000 static void __exit cti_exit(void) 1001 { 1002 coresight_remove_cti_ops(); 1003 amba_driver_unregister(&cti_driver); 1004 } 1005 1006 module_init(cti_init); 1007 module_exit(cti_exit); 1008 1009 MODULE_AUTHOR("Mike Leach <mike.leach@linaro.org>"); 1010 MODULE_DESCRIPTION("Arm CoreSight CTI Driver"); 1011 MODULE_LICENSE("GPL v2"); 1012