drivers/hwtracing/intel_th/gth.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Intel(R) Trace Hub Global Trace Hub
   4  *
   5  * Copyright (C) 2014-2015 Intel Corporation.
   6  */
   7
   8 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/types.h>
  11 #include <linux/module.h>
  12 #include <linux/device.h>
  13 #include <linux/io.h>
  14 #include <linux/mm.h>
  15 #include <linux/slab.h>
  16 #include <linux/bitmap.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include "intel_th.h"
  20 #include "gth.h"
  21
  22 struct gth_device;
  23
  24 /**
  25  * struct gth_output - GTH view on an output port
  26  * @gth:        backlink to the GTH device
  27  * @output:     link to output device's output descriptor
  28  * @index:      output port number
  29  * @port_type:  one of GTH_* port type values
  30  * @master:     bitmap of masters configured for this output
  31  */
  32 struct gth_output {
  33         struct gth_device       *gth;
  34         struct intel_th_output  *output;
  35         unsigned int            index;
  36         unsigned int            port_type;
  37         DECLARE_BITMAP(master, TH_CONFIGURABLE_MASTERS + 1);
  38 };
  39
  40 /**
  41  * struct gth_device - GTH device
  42  * @dev:        driver core's device
  43  * @base:       register window base address
  44  * @output_group:       attributes describing output ports
  45  * @master_group:       attributes describing master assignments
  46  * @output:             output ports
  47  * @master:             master/output port assignments
  48  * @gth_lock:           serializes accesses to GTH bits
  49  */
  50 struct gth_device {
  51         struct device           *dev;
  52         void __iomem            *base;
  53
  54         struct attribute_group  output_group;
  55         struct attribute_group  master_group;
  56         struct gth_output       output[TH_POSSIBLE_OUTPUTS];
  57         signed char             master[TH_CONFIGURABLE_MASTERS + 1];
  58         spinlock_t              gth_lock;
  59 };
  60
  61 static void gth_output_set(struct gth_device *gth, int port,
  62                            unsigned int config)
  63 {
  64         unsigned long reg = port & 4 ? REG_GTH_GTHOPT1 : REG_GTH_GTHOPT0;
  65         u32 val;
  66         int shift = (port & 3) * 8;
  67
  68         val = ioread32(gth->base + reg);
  69         val &= ~(0xff << shift);
  70         val |= config << shift;
  71         iowrite32(val, gth->base + reg);
  72 }
  73
  74 static unsigned int gth_output_get(struct gth_device *gth, int port)
  75 {
  76         unsigned long reg = port & 4 ? REG_GTH_GTHOPT1 : REG_GTH_GTHOPT0;
  77         u32 val;
  78         int shift = (port & 3) * 8;
  79
  80         val = ioread32(gth->base + reg);
  81         val &= 0xff << shift;
  82         val >>= shift;
  83
  84         return val;
  85 }
  86
  87 static void gth_smcfreq_set(struct gth_device *gth, int port,
  88                             unsigned int freq)
  89 {
  90         unsigned long reg = REG_GTH_SMCR0 + ((port / 2) * 4);
  91         int shift = (port & 1) * 16;
  92         u32 val;
  93
  94         val = ioread32(gth->base + reg);
  95         val &= ~(0xffff << shift);
  96         val |= freq << shift;
  97         iowrite32(val, gth->base + reg);
  98 }
  99
 100 static unsigned int gth_smcfreq_get(struct gth_device *gth, int port)
 101 {
 102         unsigned long reg = REG_GTH_SMCR0 + ((port / 2) * 4);
 103         int shift = (port & 1) * 16;
 104         u32 val;
 105
 106         val = ioread32(gth->base + reg);
 107         val &= 0xffff << shift;
 108         val >>= shift;
 109
 110         return val;
 111 }
 112
 113 /*
 114  * "masters" attribute group
 115  */
 116
 117 struct master_attribute {
 118         struct device_attribute attr;
 119         struct gth_device       *gth;
 120         unsigned int            master;
 121 };
 122
 123 static void
 124 gth_master_set(struct gth_device *gth, unsigned int master, int port)
 125 {
 126         unsigned int reg = REG_GTH_SWDEST0 + ((master >> 1) & ~3u);
 127         unsigned int shift = (master & 0x7) * 4;
 128         u32 val;
 129
 130         if (master >= 256) {
 131                 reg = REG_GTH_GSWTDEST;
 132                 shift = 0;
 133         }
 134
 135         val = ioread32(gth->base + reg);
 136         val &= ~(0xf << shift);
 137         if (port >= 0)
 138                 val |= (0x8 | port) << shift;
 139         iowrite32(val, gth->base + reg);
 140 }
 141
 142 static ssize_t master_attr_show(struct device *dev,
 143                                 struct device_attribute *attr,
 144                                 char *buf)
 145 {
 146         struct master_attribute *ma =
 147                 container_of(attr, struct master_attribute, attr);
 148         struct gth_device *gth = ma->gth;
 149         size_t count;
 150         int port;
 151
 152         spin_lock(&gth->gth_lock);
 153         port = gth->master[ma->master];
 154         spin_unlock(&gth->gth_lock);
 155
 156         if (port >= 0)
 157                 count = snprintf(buf, PAGE_SIZE, "%x\n", port);
 158         else
 159                 count = snprintf(buf, PAGE_SIZE, "disabled\n");
 160
 161         return count;
 162 }
 163
 164 static ssize_t master_attr_store(struct device *dev,
 165                                  struct device_attribute *attr,
 166                                  const char *buf, size_t count)
 167 {
 168         struct master_attribute *ma =
 169                 container_of(attr, struct master_attribute, attr);
 170         struct gth_device *gth = ma->gth;
 171         int old_port, port;
 172
 173         if (kstrtoint(buf, 10, &port) < 0)
 174                 return -EINVAL;
 175
 176         if (port >= TH_POSSIBLE_OUTPUTS || port < -1)
 177                 return -EINVAL;
 178
 179         spin_lock(&gth->gth_lock);
 180
 181         /* disconnect from the previous output port, if any */
 182         old_port = gth->master[ma->master];
 183         if (old_port >= 0) {
 184                 gth->master[ma->master] = -1;
 185                 clear_bit(ma->master, gth->output[old_port].master);
 186
 187                 /*
 188                  * if the port is active, program this setting,
 189                  * implies that runtime PM is on
 190                  */
 191                 if (gth->output[old_port].output->active)
 192                         gth_master_set(gth, ma->master, -1);
 193         }
 194
 195         /* connect to the new output port, if any */
 196         if (port >= 0) {
 197                 /* check if there's a driver for this port */
 198                 if (!gth->output[port].output) {
 199                         count = -ENODEV;
 200                         goto unlock;
 201                 }
 202
 203                 set_bit(ma->master, gth->output[port].master);
 204
 205                 /* if the port is active, program this setting, see above */
 206                 if (gth->output[port].output->active)
 207                         gth_master_set(gth, ma->master, port);
 208         }
 209
 210         gth->master[ma->master] = port;
 211
 212 unlock:
 213         spin_unlock(&gth->gth_lock);
 214
 215         return count;
 216 }
 217
 218 struct output_attribute {
 219         struct device_attribute attr;
 220         struct gth_device       *gth;
 221         unsigned int            port;
 222         unsigned int            parm;
 223 };
 224
 225 #define OUTPUT_PARM(_name, _mask, _r, _w, _what)                        \
 226         [TH_OUTPUT_PARM(_name)] = { .name = __stringify(_name),         \
 227                                     .get = gth_ ## _what ## _get,       \
 228                                     .set = gth_ ## _what ## _set,       \
 229                                     .mask = (_mask),                    \
 230                                     .readable = (_r),                   \
 231                                     .writable = (_w) }
 232
 233 static const struct output_parm {
 234         const char      *name;
 235         unsigned int    (*get)(struct gth_device *gth, int port);
 236         void            (*set)(struct gth_device *gth, int port,
 237                                unsigned int val);
 238         unsigned int    mask;
 239         unsigned int    readable : 1,
 240                         writable : 1;
 241 } output_parms[] = {
 242         OUTPUT_PARM(port,       0x7,    1, 0, output),
 243         OUTPUT_PARM(null,       BIT(3), 1, 1, output),
 244         OUTPUT_PARM(drop,       BIT(4), 1, 1, output),
 245         OUTPUT_PARM(reset,      BIT(5), 1, 0, output),
 246         OUTPUT_PARM(flush,      BIT(7), 0, 1, output),
 247         OUTPUT_PARM(smcfreq,    0xffff, 1, 1, smcfreq),
 248 };
 249
 250 static void
 251 gth_output_parm_set(struct gth_device *gth, int port, unsigned int parm,
 252                     unsigned int val)
 253 {
 254         unsigned int config = output_parms[parm].get(gth, port);
 255         unsigned int mask = output_parms[parm].mask;
 256         unsigned int shift = __ffs(mask);
 257
 258         config &= ~mask;
 259         config |= (val << shift) & mask;
 260         output_parms[parm].set(gth, port, config);
 261 }
 262
 263 static unsigned int
 264 gth_output_parm_get(struct gth_device *gth, int port, unsigned int parm)
 265 {
 266         unsigned int config = output_parms[parm].get(gth, port);
 267         unsigned int mask = output_parms[parm].mask;
 268         unsigned int shift = __ffs(mask);
 269
 270         config &= mask;
 271         config >>= shift;
 272         return config;
 273 }
 274
 275 /*
 276  * Reset outputs and sources
 277  */
 278 static int intel_th_gth_reset(struct gth_device *gth)
 279 {
 280         u32 reg;
 281         int port, i;
 282
 283         reg = ioread32(gth->base + REG_GTH_SCRPD0);
 284         if (reg & SCRPD_DEBUGGER_IN_USE)
 285                 return -EBUSY;
 286
 287         /* Always save/restore STH and TU registers in S0ix entry/exit */
 288         reg |= SCRPD_STH_IS_ENABLED | SCRPD_TRIGGER_IS_ENABLED;
 289         iowrite32(reg, gth->base + REG_GTH_SCRPD0);
 290
 291         /* output ports */
 292         for (port = 0; port < 8; port++) {
 293                 if (gth_output_parm_get(gth, port, TH_OUTPUT_PARM(port)) ==
 294                     GTH_NONE)
 295                         continue;
 296
 297                 gth_output_set(gth, port, 0);
 298                 gth_smcfreq_set(gth, port, 16);
 299         }
 300         /* disable overrides */
 301         iowrite32(0, gth->base + REG_GTH_DESTOVR);
 302
 303         /* masters swdest_0~31 and gswdest */
 304         for (i = 0; i < 33; i++)
 305                 iowrite32(0, gth->base + REG_GTH_SWDEST0 + i * 4);
 306
 307         /* sources */
 308         iowrite32(0, gth->base + REG_GTH_SCR);
 309         iowrite32(0xfc, gth->base + REG_GTH_SCR2);
 310
 311         return 0;
 312 }
 313
 314 /*
 315  * "outputs" attribute group
 316  */
 317
 318 static ssize_t output_attr_show(struct device *dev,
 319                                 struct device_attribute *attr,
 320                                 char *buf)
 321 {
 322         struct output_attribute *oa =
 323                 container_of(attr, struct output_attribute, attr);
 324         struct gth_device *gth = oa->gth;
 325         size_t count;
 326
 327         pm_runtime_get_sync(dev);
 328
 329         spin_lock(&gth->gth_lock);
 330         count = snprintf(buf, PAGE_SIZE, "%x\n",
 331                          gth_output_parm_get(gth, oa->port, oa->parm));
 332         spin_unlock(&gth->gth_lock);
 333
 334         pm_runtime_put(dev);
 335
 336         return count;
 337 }
 338
 339 static ssize_t output_attr_store(struct device *dev,
 340                                  struct device_attribute *attr,
 341                                  const char *buf, size_t count)
 342 {
 343         struct output_attribute *oa =
 344                 container_of(attr, struct output_attribute, attr);
 345         struct gth_device *gth = oa->gth;
 346         unsigned int config;
 347
 348         if (kstrtouint(buf, 16, &config) < 0)
 349                 return -EINVAL;
 350
 351         pm_runtime_get_sync(dev);
 352
 353         spin_lock(&gth->gth_lock);
 354         gth_output_parm_set(gth, oa->port, oa->parm, config);
 355         spin_unlock(&gth->gth_lock);
 356
 357         pm_runtime_put(dev);
 358
 359         return count;
 360 }
 361
 362 static int intel_th_master_attributes(struct gth_device *gth)
 363 {
 364         struct master_attribute *master_attrs;
 365         struct attribute **attrs;
 366         int i, nattrs = TH_CONFIGURABLE_MASTERS + 2;
 367
 368         attrs = devm_kcalloc(gth->dev, nattrs, sizeof(void *), GFP_KERNEL);
 369         if (!attrs)
 370                 return -ENOMEM;
 371
 372         master_attrs = devm_kcalloc(gth->dev, nattrs,
 373                                     sizeof(struct master_attribute),
 374                                     GFP_KERNEL);
 375         if (!master_attrs)
 376                 return -ENOMEM;
 377
 378         for (i = 0; i < TH_CONFIGURABLE_MASTERS + 1; i++) {
 379                 char *name;
 380
 381                 name = devm_kasprintf(gth->dev, GFP_KERNEL, "%d%s", i,
 382                                       i == TH_CONFIGURABLE_MASTERS ? "+" : "");
 383                 if (!name)
 384                         return -ENOMEM;
 385
 386                 master_attrs[i].attr.attr.name = name;
 387                 master_attrs[i].attr.attr.mode = S_IRUGO | S_IWUSR;
 388                 master_attrs[i].attr.show = master_attr_show;
 389                 master_attrs[i].attr.store = master_attr_store;
 390
 391                 sysfs_attr_init(&master_attrs[i].attr.attr);
 392                 attrs[i] = &master_attrs[i].attr.attr;
 393
 394                 master_attrs[i].gth = gth;
 395                 master_attrs[i].master = i;
 396         }
 397
 398         gth->master_group.name  = "masters";
 399         gth->master_group.attrs = attrs;
 400
 401         return sysfs_create_group(&gth->dev->kobj, &gth->master_group);
 402 }
 403
 404 static int intel_th_output_attributes(struct gth_device *gth)
 405 {
 406         struct output_attribute *out_attrs;
 407         struct attribute **attrs;
 408         int i, j, nouts = TH_POSSIBLE_OUTPUTS;
 409         int nparms = ARRAY_SIZE(output_parms);
 410         int nattrs = nouts * nparms + 1;
 411
 412         attrs = devm_kcalloc(gth->dev, nattrs, sizeof(void *), GFP_KERNEL);
 413         if (!attrs)
 414                 return -ENOMEM;
 415
 416         out_attrs = devm_kcalloc(gth->dev, nattrs,
 417                                  sizeof(struct output_attribute),
 418                                  GFP_KERNEL);
 419         if (!out_attrs)
 420                 return -ENOMEM;
 421
 422         for (i = 0; i < nouts; i++) {
 423                 for (j = 0; j < nparms; j++) {
 424                         unsigned int idx = i * nparms + j;
 425                         char *name;
 426
 427                         name = devm_kasprintf(gth->dev, GFP_KERNEL, "%d_%s", i,
 428                                               output_parms[j].name);
 429                         if (!name)
 430                                 return -ENOMEM;
 431
 432                         out_attrs[idx].attr.attr.name = name;
 433
 434                         if (output_parms[j].readable) {
 435                                 out_attrs[idx].attr.attr.mode |= S_IRUGO;
 436                                 out_attrs[idx].attr.show = output_attr_show;
 437                         }
 438
 439                         if (output_parms[j].writable) {
 440                                 out_attrs[idx].attr.attr.mode |= S_IWUSR;
 441                                 out_attrs[idx].attr.store = output_attr_store;
 442                         }
 443
 444                         sysfs_attr_init(&out_attrs[idx].attr.attr);
 445                         attrs[idx] = &out_attrs[idx].attr.attr;
 446
 447                         out_attrs[idx].gth = gth;
 448                         out_attrs[idx].port = i;
 449                         out_attrs[idx].parm = j;
 450                 }
 451         }
 452
 453         gth->output_group.name  = "outputs";
 454         gth->output_group.attrs = attrs;
 455
 456         return sysfs_create_group(&gth->dev->kobj, &gth->output_group);
 457 }
 458
 459 /**
 460  * intel_th_gth_disable() - disable tracing to an output device
 461  * @thdev:      GTH device
 462  * @output:     output device's descriptor
 463  *
 464  * This will deconfigure all masters set to output to this device,
 465  * disable tracing using force storeEn off signal and wait for the
 466  * "pipeline empty" bit for corresponding output port.
 467  */
 468 static void intel_th_gth_disable(struct intel_th_device *thdev,
 469                                  struct intel_th_output *output)
 470 {
 471         struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 472         unsigned long count;
 473         int master;
 474         u32 reg;
 475
 476         spin_lock(&gth->gth_lock);
 477         output->active = false;
 478
 479         for_each_set_bit(master, gth->output[output->port].master,
 480                          TH_CONFIGURABLE_MASTERS + 1) {
 481                 gth_master_set(gth, master, -1);
 482         }
 483         spin_unlock(&gth->gth_lock);
 484
 485         iowrite32(0, gth->base + REG_GTH_SCR);
 486         iowrite32(0xfd, gth->base + REG_GTH_SCR2);
 487
 488         /* wait on pipeline empty for the given port */
 489         for (reg = 0, count = GTH_PLE_WAITLOOP_DEPTH;
 490              count && !(reg & BIT(output->port)); count--) {
 491                 reg = ioread32(gth->base + REG_GTH_STAT);
 492                 cpu_relax();
 493         }
 494
 495         /* clear force capture done for next captures */
 496         iowrite32(0xfc, gth->base + REG_GTH_SCR2);
 497
 498         if (!count)
 499                 dev_dbg(&thdev->dev, "timeout waiting for GTH[%d] PLE\n",
 500                         output->port);
 501
 502         reg = ioread32(gth->base + REG_GTH_SCRPD0);
 503         reg &= ~output->scratchpad;
 504         iowrite32(reg, gth->base + REG_GTH_SCRPD0);
 505 }
 506
 507 static void gth_tscu_resync(struct gth_device *gth)
 508 {
 509         u32 reg;
 510
 511         reg = ioread32(gth->base + REG_TSCU_TSUCTRL);
 512         reg &= ~TSUCTRL_CTCRESYNC;
 513         iowrite32(reg, gth->base + REG_TSCU_TSUCTRL);
 514 }
 515
 516 static void intel_th_gth_prepare(struct intel_th_device *thdev,
 517                                  struct intel_th_output *output)
 518 {
 519         struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 520         int count;
 521
 522         /*
 523          * Wait until the output port is in reset before we start
 524          * programming it.
 525          */
 526         for (count = GTH_PLE_WAITLOOP_DEPTH;
 527              count && !(gth_output_get(gth, output->port) & BIT(5)); count--)
 528                 cpu_relax();
 529 }
 530
 531 /**
 532  * intel_th_gth_enable() - enable tracing to an output device
 533  * @thdev:      GTH device
 534  * @output:     output device's descriptor
 535  *
 536  * This will configure all masters set to output to this device and
 537  * enable tracing using force storeEn signal.
 538  */
 539 static void intel_th_gth_enable(struct intel_th_device *thdev,
 540                                 struct intel_th_output *output)
 541 {
 542         struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 543         struct intel_th *th = to_intel_th(thdev);
 544         u32 scr = 0xfc0000, scrpd;
 545         int master;
 546
 547         spin_lock(&gth->gth_lock);
 548         for_each_set_bit(master, gth->output[output->port].master,
 549                          TH_CONFIGURABLE_MASTERS + 1) {
 550                 gth_master_set(gth, master, output->port);
 551         }
 552
 553         if (output->multiblock)
 554                 scr |= 0xff;
 555
 556         output->active = true;
 557         spin_unlock(&gth->gth_lock);
 558
 559         if (INTEL_TH_CAP(th, tscu_enable))
 560                 gth_tscu_resync(gth);
 561
 562         scrpd = ioread32(gth->base + REG_GTH_SCRPD0);
 563         scrpd |= output->scratchpad;
 564         iowrite32(scrpd, gth->base + REG_GTH_SCRPD0);
 565
 566         iowrite32(scr, gth->base + REG_GTH_SCR);
 567         iowrite32(0, gth->base + REG_GTH_SCR2);
 568 }
 569
 570 /**
 571  * intel_th_gth_assign() - assign output device to a GTH output port
 572  * @thdev:      GTH device
 573  * @othdev:     output device
 574  *
 575  * This will match a given output device parameters against present
 576  * output ports on the GTH and fill out relevant bits in output device's
 577  * descriptor.
 578  *
 579  * Return:      0 on success, -errno on error.
 580  */
 581 static int intel_th_gth_assign(struct intel_th_device *thdev,
 582                                struct intel_th_device *othdev)
 583 {
 584         struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 585         int i, id;
 586
 587         if (thdev->host_mode)
 588                 return -EBUSY;
 589
 590         if (othdev->type != INTEL_TH_OUTPUT)
 591                 return -EINVAL;
 592
 593         for (i = 0, id = 0; i < TH_POSSIBLE_OUTPUTS; i++) {
 594                 if (gth->output[i].port_type != othdev->output.type)
 595                         continue;
 596
 597                 if (othdev->id == -1 || othdev->id == id)
 598                         goto found;
 599
 600                 id++;
 601         }
 602
 603         return -ENOENT;
 604
 605 found:
 606         spin_lock(&gth->gth_lock);
 607         othdev->output.port = i;
 608         othdev->output.active = false;
 609         gth->output[i].output = &othdev->output;
 610         spin_unlock(&gth->gth_lock);
 611
 612         return 0;
 613 }
 614
 615 /**
 616  * intel_th_gth_unassign() - deassociate an output device from its output port
 617  * @thdev:      GTH device
 618  * @othdev:     output device
 619  */
 620 static void intel_th_gth_unassign(struct intel_th_device *thdev,
 621                                   struct intel_th_device *othdev)
 622 {
 623         struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 624         int port = othdev->output.port;
 625         int master;
 626
 627         if (thdev->host_mode)
 628                 return;
 629
 630         spin_lock(&gth->gth_lock);
 631         othdev->output.port = -1;
 632         othdev->output.active = false;
 633         gth->output[port].output = NULL;
 634         for (master = 0; master < TH_CONFIGURABLE_MASTERS + 1; master++)
 635                 if (gth->master[master] == port)
 636                         gth->master[master] = -1;
 637         spin_unlock(&gth->gth_lock);
 638 }
 639
 640 static int
 641 intel_th_gth_set_output(struct intel_th_device *thdev, unsigned int master)
 642 {
 643         struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 644         int port = 0; /* FIXME: make default output configurable */
 645
 646         /*
 647          * everything above TH_CONFIGURABLE_MASTERS is controlled by the
 648          * same register
 649          */
 650         if (master > TH_CONFIGURABLE_MASTERS)
 651                 master = TH_CONFIGURABLE_MASTERS;
 652
 653         spin_lock(&gth->gth_lock);
 654         if (gth->master[master] == -1) {
 655                 set_bit(master, gth->output[port].master);
 656                 gth->master[master] = port;
 657         }
 658         spin_unlock(&gth->gth_lock);
 659
 660         return 0;
 661 }
 662
 663 static int intel_th_gth_probe(struct intel_th_device *thdev)
 664 {
 665         struct device *dev = &thdev->dev;
 666         struct intel_th *th = dev_get_drvdata(dev->parent);
 667         struct gth_device *gth;
 668         struct resource *res;
 669         void __iomem *base;
 670         int i, ret;
 671
 672         res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0);
 673         if (!res)
 674                 return -ENODEV;
 675
 676         base = devm_ioremap(dev, res->start, resource_size(res));
 677         if (!base)
 678                 return -ENOMEM;
 679
 680         gth = devm_kzalloc(dev, sizeof(*gth), GFP_KERNEL);
 681         if (!gth)
 682                 return -ENOMEM;
 683
 684         gth->dev = dev;
 685         gth->base = base;
 686         spin_lock_init(&gth->gth_lock);
 687
 688         dev_set_drvdata(dev, gth);
 689
 690         /*
 691          * Host mode can be signalled via SW means or via SCRPD_DEBUGGER_IN_USE
 692          * bit. Either way, don't reset HW in this case, and don't export any
 693          * capture configuration attributes. Also, refuse to assign output
 694          * drivers to ports, see intel_th_gth_assign().
 695          */
 696         if (thdev->host_mode)
 697                 return 0;
 698
 699         ret = intel_th_gth_reset(gth);
 700         if (ret) {
 701                 if (ret != -EBUSY)
 702                         return ret;
 703
 704                 thdev->host_mode = true;
 705
 706                 return 0;
 707         }
 708
 709         for (i = 0; i < TH_CONFIGURABLE_MASTERS + 1; i++)
 710                 gth->master[i] = -1;
 711
 712         for (i = 0; i < TH_POSSIBLE_OUTPUTS; i++) {
 713                 gth->output[i].gth = gth;
 714                 gth->output[i].index = i;
 715                 gth->output[i].port_type =
 716                         gth_output_parm_get(gth, i, TH_OUTPUT_PARM(port));
 717                 if (gth->output[i].port_type == GTH_NONE)
 718                         continue;
 719
 720                 ret = intel_th_output_enable(th, gth->output[i].port_type);
 721                 /* -ENODEV is ok, we just won't have that device enumerated */
 722                 if (ret && ret != -ENODEV)
 723                         return ret;
 724         }
 725
 726         if (intel_th_output_attributes(gth) ||
 727             intel_th_master_attributes(gth)) {
 728                 pr_warn("Can't initialize sysfs attributes\n");
 729
 730                 if (gth->output_group.attrs)
 731                         sysfs_remove_group(&gth->dev->kobj, &gth->output_group);
 732                 return -ENOMEM;
 733         }
 734
 735         return 0;
 736 }
 737
 738 static void intel_th_gth_remove(struct intel_th_device *thdev)
 739 {
 740         struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 741
 742         sysfs_remove_group(&gth->dev->kobj, &gth->output_group);
 743         sysfs_remove_group(&gth->dev->kobj, &gth->master_group);
 744 }
 745
 746 static struct intel_th_driver intel_th_gth_driver = {
 747         .probe          = intel_th_gth_probe,
 748         .remove         = intel_th_gth_remove,
 749         .assign         = intel_th_gth_assign,
 750         .unassign       = intel_th_gth_unassign,
 751         .set_output     = intel_th_gth_set_output,
 752         .prepare        = intel_th_gth_prepare,
 753         .enable         = intel_th_gth_enable,
 754         .disable        = intel_th_gth_disable,
 755         .driver = {
 756                 .name   = "gth",
 757                 .owner  = THIS_MODULE,
 758         },
 759 };
 760
 761 module_driver(intel_th_gth_driver,
 762               intel_th_driver_register,
 763               intel_th_driver_unregister);
 764
 765 MODULE_ALIAS("intel_th_switch");
 766 MODULE_LICENSE("GPL v2");
 767 MODULE_DESCRIPTION("Intel(R) Trace Hub Global Trace Hub driver");
 768 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");