drivers/hwtracing/coresight/coresight-cti-core.c

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