drivers/firmware/tegra/bpmp.c

   1 /*
   2  * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  */
  13
  14 #include <linux/clk/tegra.h>
  15 #include <linux/genalloc.h>
  16 #include <linux/mailbox_client.h>
  17 #include <linux/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/semaphore.h>
  22 #include <linux/sched/clock.h>
  23
  24 #include <soc/tegra/bpmp.h>
  25 #include <soc/tegra/bpmp-abi.h>
  26 #include <soc/tegra/ivc.h>
  27
  28 #define MSG_ACK         BIT(0)
  29 #define MSG_RING        BIT(1)
  30
  31 static inline struct tegra_bpmp *
  32 mbox_client_to_bpmp(struct mbox_client *client)
  33 {
  34         return container_of(client, struct tegra_bpmp, mbox.client);
  35 }
  36
  37 struct tegra_bpmp *tegra_bpmp_get(struct device *dev)
  38 {
  39         struct platform_device *pdev;
  40         struct tegra_bpmp *bpmp;
  41         struct device_node *np;
  42
  43         np = of_parse_phandle(dev->of_node, "nvidia,bpmp", 0);
  44         if (!np)
  45                 return ERR_PTR(-ENOENT);
  46
  47         pdev = of_find_device_by_node(np);
  48         if (!pdev) {
  49                 bpmp = ERR_PTR(-ENODEV);
  50                 goto put;
  51         }
  52
  53         bpmp = platform_get_drvdata(pdev);
  54         if (!bpmp) {
  55                 bpmp = ERR_PTR(-EPROBE_DEFER);
  56                 put_device(&pdev->dev);
  57                 goto put;
  58         }
  59
  60 put:
  61         of_node_put(np);
  62         return bpmp;
  63 }
  64 EXPORT_SYMBOL_GPL(tegra_bpmp_get);
  65
  66 void tegra_bpmp_put(struct tegra_bpmp *bpmp)
  67 {
  68         if (bpmp)
  69                 put_device(bpmp->dev);
  70 }
  71 EXPORT_SYMBOL_GPL(tegra_bpmp_put);
  72
  73 static int tegra_bpmp_channel_get_index(struct tegra_bpmp_channel *channel)
  74 {
  75         return channel - channel->bpmp->channels;
  76 }
  77
  78 static int
  79 tegra_bpmp_channel_get_thread_index(struct tegra_bpmp_channel *channel)
  80 {
  81         struct tegra_bpmp *bpmp = channel->bpmp;
  82         unsigned int offset, count;
  83         int index;
  84
  85         offset = bpmp->soc->channels.thread.offset;
  86         count = bpmp->soc->channels.thread.count;
  87
  88         index = tegra_bpmp_channel_get_index(channel);
  89         if (index < 0)
  90                 return index;
  91
  92         if (index < offset || index >= offset + count)
  93                 return -EINVAL;
  94
  95         return index - offset;
  96 }
  97
  98 static struct tegra_bpmp_channel *
  99 tegra_bpmp_channel_get_thread(struct tegra_bpmp *bpmp, unsigned int index)
 100 {
 101         unsigned int offset = bpmp->soc->channels.thread.offset;
 102         unsigned int count = bpmp->soc->channels.thread.count;
 103
 104         if (index >= count)
 105                 return NULL;
 106
 107         return &bpmp->channels[offset + index];
 108 }
 109
 110 static struct tegra_bpmp_channel *
 111 tegra_bpmp_channel_get_tx(struct tegra_bpmp *bpmp)
 112 {
 113         unsigned int offset = bpmp->soc->channels.cpu_tx.offset;
 114
 115         return &bpmp->channels[offset + smp_processor_id()];
 116 }
 117
 118 static struct tegra_bpmp_channel *
 119 tegra_bpmp_channel_get_rx(struct tegra_bpmp *bpmp)
 120 {
 121         unsigned int offset = bpmp->soc->channels.cpu_rx.offset;
 122
 123         return &bpmp->channels[offset];
 124 }
 125
 126 static bool tegra_bpmp_message_valid(const struct tegra_bpmp_message *msg)
 127 {
 128         return (msg->tx.size <= MSG_DATA_MIN_SZ) &&
 129                (msg->rx.size <= MSG_DATA_MIN_SZ) &&
 130                (msg->tx.size == 0 || msg->tx.data) &&
 131                (msg->rx.size == 0 || msg->rx.data);
 132 }
 133
 134 static bool tegra_bpmp_master_acked(struct tegra_bpmp_channel *channel)
 135 {
 136         void *frame;
 137
 138         frame = tegra_ivc_read_get_next_frame(channel->ivc);
 139         if (IS_ERR(frame)) {
 140                 channel->ib = NULL;
 141                 return false;
 142         }
 143
 144         channel->ib = frame;
 145
 146         return true;
 147 }
 148
 149 static int tegra_bpmp_wait_ack(struct tegra_bpmp_channel *channel)
 150 {
 151         unsigned long timeout = channel->bpmp->soc->channels.cpu_tx.timeout;
 152         ktime_t end;
 153
 154         end = ktime_add_us(ktime_get(), timeout);
 155
 156         do {
 157                 if (tegra_bpmp_master_acked(channel))
 158                         return 0;
 159         } while (ktime_before(ktime_get(), end));
 160
 161         return -ETIMEDOUT;
 162 }
 163
 164 static bool tegra_bpmp_master_free(struct tegra_bpmp_channel *channel)
 165 {
 166         void *frame;
 167
 168         frame = tegra_ivc_write_get_next_frame(channel->ivc);
 169         if (IS_ERR(frame)) {
 170                 channel->ob = NULL;
 171                 return false;
 172         }
 173
 174         channel->ob = frame;
 175
 176         return true;
 177 }
 178
 179 static int tegra_bpmp_wait_master_free(struct tegra_bpmp_channel *channel)
 180 {
 181         unsigned long timeout = channel->bpmp->soc->channels.cpu_tx.timeout;
 182         ktime_t start, now;
 183
 184         start = ns_to_ktime(local_clock());
 185
 186         do {
 187                 if (tegra_bpmp_master_free(channel))
 188                         return 0;
 189
 190                 now = ns_to_ktime(local_clock());
 191         } while (ktime_us_delta(now, start) < timeout);
 192
 193         return -ETIMEDOUT;
 194 }
 195
 196 static ssize_t __tegra_bpmp_channel_read(struct tegra_bpmp_channel *channel,
 197                                          void *data, size_t size)
 198 {
 199         if (data && size > 0)
 200                 memcpy(data, channel->ib->data, size);
 201
 202         return tegra_ivc_read_advance(channel->ivc);
 203 }
 204
 205 static ssize_t tegra_bpmp_channel_read(struct tegra_bpmp_channel *channel,
 206                                        void *data, size_t size)
 207 {
 208         struct tegra_bpmp *bpmp = channel->bpmp;
 209         unsigned long flags;
 210         ssize_t err;
 211         int index;
 212
 213         index = tegra_bpmp_channel_get_thread_index(channel);
 214         if (index < 0) {
 215                 err = index;
 216                 goto unlock;
 217         }
 218
 219         spin_lock_irqsave(&bpmp->lock, flags);
 220         err = __tegra_bpmp_channel_read(channel, data, size);
 221         clear_bit(index, bpmp->threaded.allocated);
 222         spin_unlock_irqrestore(&bpmp->lock, flags);
 223
 224 unlock:
 225         up(&bpmp->threaded.lock);
 226
 227         return err;
 228 }
 229
 230 static ssize_t __tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel,
 231                                           unsigned int mrq, unsigned long flags,
 232                                           const void *data, size_t size)
 233 {
 234         channel->ob->code = mrq;
 235         channel->ob->flags = flags;
 236
 237         if (data && size > 0)
 238                 memcpy(channel->ob->data, data, size);
 239
 240         return tegra_ivc_write_advance(channel->ivc);
 241 }
 242
 243 static struct tegra_bpmp_channel *
 244 tegra_bpmp_write_threaded(struct tegra_bpmp *bpmp, unsigned int mrq,
 245                           const void *data, size_t size)
 246 {
 247         unsigned long timeout = bpmp->soc->channels.thread.timeout;
 248         unsigned int count = bpmp->soc->channels.thread.count;
 249         struct tegra_bpmp_channel *channel;
 250         unsigned long flags;
 251         unsigned int index;
 252         int err;
 253
 254         err = down_timeout(&bpmp->threaded.lock, usecs_to_jiffies(timeout));
 255         if (err < 0)
 256                 return ERR_PTR(err);
 257
 258         spin_lock_irqsave(&bpmp->lock, flags);
 259
 260         index = find_first_zero_bit(bpmp->threaded.allocated, count);
 261         if (index == count) {
 262                 err = -EBUSY;
 263                 goto unlock;
 264         }
 265
 266         channel = tegra_bpmp_channel_get_thread(bpmp, index);
 267         if (!channel) {
 268                 err = -EINVAL;
 269                 goto unlock;
 270         }
 271
 272         if (!tegra_bpmp_master_free(channel)) {
 273                 err = -EBUSY;
 274                 goto unlock;
 275         }
 276
 277         set_bit(index, bpmp->threaded.allocated);
 278
 279         err = __tegra_bpmp_channel_write(channel, mrq, MSG_ACK | MSG_RING,
 280                                          data, size);
 281         if (err < 0)
 282                 goto clear_allocated;
 283
 284         set_bit(index, bpmp->threaded.busy);
 285
 286         spin_unlock_irqrestore(&bpmp->lock, flags);
 287         return channel;
 288
 289 clear_allocated:
 290         clear_bit(index, bpmp->threaded.allocated);
 291 unlock:
 292         spin_unlock_irqrestore(&bpmp->lock, flags);
 293         up(&bpmp->threaded.lock);
 294
 295         return ERR_PTR(err);
 296 }
 297
 298 static ssize_t tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel,
 299                                         unsigned int mrq, unsigned long flags,
 300                                         const void *data, size_t size)
 301 {
 302         int err;
 303
 304         err = tegra_bpmp_wait_master_free(channel);
 305         if (err < 0)
 306                 return err;
 307
 308         return __tegra_bpmp_channel_write(channel, mrq, flags, data, size);
 309 }
 310
 311 int tegra_bpmp_transfer_atomic(struct tegra_bpmp *bpmp,
 312                                struct tegra_bpmp_message *msg)
 313 {
 314         struct tegra_bpmp_channel *channel;
 315         int err;
 316
 317         if (WARN_ON(!irqs_disabled()))
 318                 return -EPERM;
 319
 320         if (!tegra_bpmp_message_valid(msg))
 321                 return -EINVAL;
 322
 323         channel = tegra_bpmp_channel_get_tx(bpmp);
 324
 325         err = tegra_bpmp_channel_write(channel, msg->mrq, MSG_ACK,
 326                                        msg->tx.data, msg->tx.size);
 327         if (err < 0)
 328                 return err;
 329
 330         err = mbox_send_message(bpmp->mbox.channel, NULL);
 331         if (err < 0)
 332                 return err;
 333
 334         mbox_client_txdone(bpmp->mbox.channel, 0);
 335
 336         err = tegra_bpmp_wait_ack(channel);
 337         if (err < 0)
 338                 return err;
 339
 340         return __tegra_bpmp_channel_read(channel, msg->rx.data, msg->rx.size);
 341 }
 342 EXPORT_SYMBOL_GPL(tegra_bpmp_transfer_atomic);
 343
 344 int tegra_bpmp_transfer(struct tegra_bpmp *bpmp,
 345                         struct tegra_bpmp_message *msg)
 346 {
 347         struct tegra_bpmp_channel *channel;
 348         unsigned long timeout;
 349         int err;
 350
 351         if (WARN_ON(irqs_disabled()))
 352                 return -EPERM;
 353
 354         if (!tegra_bpmp_message_valid(msg))
 355                 return -EINVAL;
 356
 357         channel = tegra_bpmp_write_threaded(bpmp, msg->mrq, msg->tx.data,
 358                                             msg->tx.size);
 359         if (IS_ERR(channel))
 360                 return PTR_ERR(channel);
 361
 362         err = mbox_send_message(bpmp->mbox.channel, NULL);
 363         if (err < 0)
 364                 return err;
 365
 366         mbox_client_txdone(bpmp->mbox.channel, 0);
 367
 368         timeout = usecs_to_jiffies(bpmp->soc->channels.thread.timeout);
 369
 370         err = wait_for_completion_timeout(&channel->completion, timeout);
 371         if (err == 0)
 372                 return -ETIMEDOUT;
 373
 374         return tegra_bpmp_channel_read(channel, msg->rx.data, msg->rx.size);
 375 }
 376 EXPORT_SYMBOL_GPL(tegra_bpmp_transfer);
 377
 378 static struct tegra_bpmp_mrq *tegra_bpmp_find_mrq(struct tegra_bpmp *bpmp,
 379                                                   unsigned int mrq)
 380 {
 381         struct tegra_bpmp_mrq *entry;
 382
 383         list_for_each_entry(entry, &bpmp->mrqs, list)
 384                 if (entry->mrq == mrq)
 385                         return entry;
 386
 387         return NULL;
 388 }
 389
 390 static void tegra_bpmp_mrq_return(struct tegra_bpmp_channel *channel,
 391                                   int code, const void *data, size_t size)
 392 {
 393         unsigned long flags = channel->ib->flags;
 394         struct tegra_bpmp *bpmp = channel->bpmp;
 395         struct tegra_bpmp_mb_data *frame;
 396         int err;
 397
 398         if (WARN_ON(size > MSG_DATA_MIN_SZ))
 399                 return;
 400
 401         err = tegra_ivc_read_advance(channel->ivc);
 402         if (WARN_ON(err < 0))
 403                 return;
 404
 405         if ((flags & MSG_ACK) == 0)
 406                 return;
 407
 408         frame = tegra_ivc_write_get_next_frame(channel->ivc);
 409         if (WARN_ON(IS_ERR(frame)))
 410                 return;
 411
 412         frame->code = code;
 413
 414         if (data && size > 0)
 415                 memcpy(frame->data, data, size);
 416
 417         err = tegra_ivc_write_advance(channel->ivc);
 418         if (WARN_ON(err < 0))
 419                 return;
 420
 421         if (flags & MSG_RING) {
 422                 err = mbox_send_message(bpmp->mbox.channel, NULL);
 423                 if (WARN_ON(err < 0))
 424                         return;
 425
 426                 mbox_client_txdone(bpmp->mbox.channel, 0);
 427         }
 428 }
 429
 430 static void tegra_bpmp_handle_mrq(struct tegra_bpmp *bpmp,
 431                                   unsigned int mrq,
 432                                   struct tegra_bpmp_channel *channel)
 433 {
 434         struct tegra_bpmp_mrq *entry;
 435         u32 zero = 0;
 436
 437         spin_lock(&bpmp->lock);
 438
 439         entry = tegra_bpmp_find_mrq(bpmp, mrq);
 440         if (!entry) {
 441                 spin_unlock(&bpmp->lock);
 442                 tegra_bpmp_mrq_return(channel, -EINVAL, &zero, sizeof(zero));
 443                 return;
 444         }
 445
 446         entry->handler(mrq, channel, entry->data);
 447
 448         spin_unlock(&bpmp->lock);
 449 }
 450
 451 int tegra_bpmp_request_mrq(struct tegra_bpmp *bpmp, unsigned int mrq,
 452                            tegra_bpmp_mrq_handler_t handler, void *data)
 453 {
 454         struct tegra_bpmp_mrq *entry;
 455         unsigned long flags;
 456
 457         if (!handler)
 458                 return -EINVAL;
 459
 460         entry = devm_kzalloc(bpmp->dev, sizeof(*entry), GFP_KERNEL);
 461         if (!entry)
 462                 return -ENOMEM;
 463
 464         spin_lock_irqsave(&bpmp->lock, flags);
 465
 466         entry->mrq = mrq;
 467         entry->handler = handler;
 468         entry->data = data;
 469         list_add(&entry->list, &bpmp->mrqs);
 470
 471         spin_unlock_irqrestore(&bpmp->lock, flags);
 472
 473         return 0;
 474 }
 475 EXPORT_SYMBOL_GPL(tegra_bpmp_request_mrq);
 476
 477 void tegra_bpmp_free_mrq(struct tegra_bpmp *bpmp, unsigned int mrq, void *data)
 478 {
 479         struct tegra_bpmp_mrq *entry;
 480         unsigned long flags;
 481
 482         spin_lock_irqsave(&bpmp->lock, flags);
 483
 484         entry = tegra_bpmp_find_mrq(bpmp, mrq);
 485         if (!entry)
 486                 goto unlock;
 487
 488         list_del(&entry->list);
 489         devm_kfree(bpmp->dev, entry);
 490
 491 unlock:
 492         spin_unlock_irqrestore(&bpmp->lock, flags);
 493 }
 494 EXPORT_SYMBOL_GPL(tegra_bpmp_free_mrq);
 495
 496 static void tegra_bpmp_mrq_handle_ping(unsigned int mrq,
 497                                        struct tegra_bpmp_channel *channel,
 498                                        void *data)
 499 {
 500         struct mrq_ping_request *request;
 501         struct mrq_ping_response response;
 502
 503         request = (struct mrq_ping_request *)channel->ib->data;
 504
 505         memset(&response, 0, sizeof(response));
 506         response.reply = request->challenge << 1;
 507
 508         tegra_bpmp_mrq_return(channel, 0, &response, sizeof(response));
 509 }
 510
 511 static int tegra_bpmp_ping(struct tegra_bpmp *bpmp)
 512 {
 513         struct mrq_ping_response response;
 514         struct mrq_ping_request request;
 515         struct tegra_bpmp_message msg;
 516         unsigned long flags;
 517         ktime_t start, end;
 518         int err;
 519
 520         memset(&request, 0, sizeof(request));
 521         request.challenge = 1;
 522
 523         memset(&response, 0, sizeof(response));
 524
 525         memset(&msg, 0, sizeof(msg));
 526         msg.mrq = MRQ_PING;
 527         msg.tx.data = &request;
 528         msg.tx.size = sizeof(request);
 529         msg.rx.data = &response;
 530         msg.rx.size = sizeof(response);
 531
 532         local_irq_save(flags);
 533         start = ktime_get();
 534         err = tegra_bpmp_transfer_atomic(bpmp, &msg);
 535         end = ktime_get();
 536         local_irq_restore(flags);
 537
 538         if (!err)
 539                 dev_dbg(bpmp->dev,
 540                         "ping ok: challenge: %u, response: %u, time: %lld\n",
 541                         request.challenge, response.reply,
 542                         ktime_to_us(ktime_sub(end, start)));
 543
 544         return err;
 545 }
 546
 547 static int tegra_bpmp_get_firmware_tag(struct tegra_bpmp *bpmp, char *tag,
 548                                        size_t size)
 549 {
 550         struct mrq_query_tag_request request;
 551         struct tegra_bpmp_message msg;
 552         unsigned long flags;
 553         dma_addr_t phys;
 554         void *virt;
 555         int err;
 556
 557         virt = dma_alloc_coherent(bpmp->dev, MSG_DATA_MIN_SZ, &phys,
 558                                   GFP_KERNEL | GFP_DMA32);
 559         if (!virt)
 560                 return -ENOMEM;
 561
 562         memset(&request, 0, sizeof(request));
 563         request.addr = phys;
 564
 565         memset(&msg, 0, sizeof(msg));
 566         msg.mrq = MRQ_QUERY_TAG;
 567         msg.tx.data = &request;
 568         msg.tx.size = sizeof(request);
 569
 570         local_irq_save(flags);
 571         err = tegra_bpmp_transfer_atomic(bpmp, &msg);
 572         local_irq_restore(flags);
 573
 574         if (err == 0)
 575                 strlcpy(tag, virt, size);
 576
 577         dma_free_coherent(bpmp->dev, MSG_DATA_MIN_SZ, virt, phys);
 578
 579         return err;
 580 }
 581
 582 static void tegra_bpmp_channel_signal(struct tegra_bpmp_channel *channel)
 583 {
 584         unsigned long flags = channel->ob->flags;
 585
 586         if ((flags & MSG_RING) == 0)
 587                 return;
 588
 589         complete(&channel->completion);
 590 }
 591
 592 static void tegra_bpmp_handle_rx(struct mbox_client *client, void *data)
 593 {
 594         struct tegra_bpmp *bpmp = mbox_client_to_bpmp(client);
 595         struct tegra_bpmp_channel *channel;
 596         unsigned int i, count;
 597         unsigned long *busy;
 598
 599         channel = tegra_bpmp_channel_get_rx(bpmp);
 600         count = bpmp->soc->channels.thread.count;
 601         busy = bpmp->threaded.busy;
 602
 603         if (tegra_bpmp_master_acked(channel))
 604                 tegra_bpmp_handle_mrq(bpmp, channel->ib->code, channel);
 605
 606         spin_lock(&bpmp->lock);
 607
 608         for_each_set_bit(i, busy, count) {
 609                 struct tegra_bpmp_channel *channel;
 610
 611                 channel = tegra_bpmp_channel_get_thread(bpmp, i);
 612                 if (!channel)
 613                         continue;
 614
 615                 if (tegra_bpmp_master_acked(channel)) {
 616                         tegra_bpmp_channel_signal(channel);
 617                         clear_bit(i, busy);
 618                 }
 619         }
 620
 621         spin_unlock(&bpmp->lock);
 622 }
 623
 624 static void tegra_bpmp_ivc_notify(struct tegra_ivc *ivc, void *data)
 625 {
 626         struct tegra_bpmp *bpmp = data;
 627         int err;
 628
 629         if (WARN_ON(bpmp->mbox.channel == NULL))
 630                 return;
 631
 632         err = mbox_send_message(bpmp->mbox.channel, NULL);
 633         if (err < 0)
 634                 return;
 635
 636         mbox_client_txdone(bpmp->mbox.channel, 0);
 637 }
 638
 639 static int tegra_bpmp_channel_init(struct tegra_bpmp_channel *channel,
 640                                    struct tegra_bpmp *bpmp,
 641                                    unsigned int index)
 642 {
 643         size_t message_size, queue_size;
 644         unsigned int offset;
 645         int err;
 646
 647         channel->ivc = devm_kzalloc(bpmp->dev, sizeof(*channel->ivc),
 648                                     GFP_KERNEL);
 649         if (!channel->ivc)
 650                 return -ENOMEM;
 651
 652         message_size = tegra_ivc_align(MSG_MIN_SZ);
 653         queue_size = tegra_ivc_total_queue_size(message_size);
 654         offset = queue_size * index;
 655
 656         err = tegra_ivc_init(channel->ivc, NULL,
 657                              bpmp->rx.virt + offset, bpmp->rx.phys + offset,
 658                              bpmp->tx.virt + offset, bpmp->tx.phys + offset,
 659                              1, message_size, tegra_bpmp_ivc_notify,
 660                              bpmp);
 661         if (err < 0) {
 662                 dev_err(bpmp->dev, "failed to setup IVC for channel %u: %d\n",
 663                         index, err);
 664                 return err;
 665         }
 666
 667         init_completion(&channel->completion);
 668         channel->bpmp = bpmp;
 669
 670         return 0;
 671 }
 672
 673 static void tegra_bpmp_channel_reset(struct tegra_bpmp_channel *channel)
 674 {
 675         /* reset the channel state */
 676         tegra_ivc_reset(channel->ivc);
 677
 678         /* sync the channel state with BPMP */
 679         while (tegra_ivc_notified(channel->ivc))
 680                 ;
 681 }
 682
 683 static void tegra_bpmp_channel_cleanup(struct tegra_bpmp_channel *channel)
 684 {
 685         tegra_ivc_cleanup(channel->ivc);
 686 }
 687
 688 static int tegra_bpmp_probe(struct platform_device *pdev)
 689 {
 690         struct tegra_bpmp_channel *channel;
 691         struct tegra_bpmp *bpmp;
 692         unsigned int i;
 693         char tag[32];
 694         size_t size;
 695         int err;
 696
 697         bpmp = devm_kzalloc(&pdev->dev, sizeof(*bpmp), GFP_KERNEL);
 698         if (!bpmp)
 699                 return -ENOMEM;
 700
 701         bpmp->soc = of_device_get_match_data(&pdev->dev);
 702         bpmp->dev = &pdev->dev;
 703
 704         bpmp->tx.pool = of_gen_pool_get(pdev->dev.of_node, "shmem", 0);
 705         if (!bpmp->tx.pool) {
 706                 dev_err(&pdev->dev, "TX shmem pool not found\n");
 707                 return -ENOMEM;
 708         }
 709
 710         bpmp->tx.virt = gen_pool_dma_alloc(bpmp->tx.pool, 4096, &bpmp->tx.phys);
 711         if (!bpmp->tx.virt) {
 712                 dev_err(&pdev->dev, "failed to allocate from TX pool\n");
 713                 return -ENOMEM;
 714         }
 715
 716         bpmp->rx.pool = of_gen_pool_get(pdev->dev.of_node, "shmem", 1);
 717         if (!bpmp->rx.pool) {
 718                 dev_err(&pdev->dev, "RX shmem pool not found\n");
 719                 err = -ENOMEM;
 720                 goto free_tx;
 721         }
 722
 723         bpmp->rx.virt = gen_pool_dma_alloc(bpmp->rx.pool, 4096, &bpmp->rx.phys);
 724         if (!bpmp->rx.pool) {
 725                 dev_err(&pdev->dev, "failed to allocate from RX pool\n");
 726                 err = -ENOMEM;
 727                 goto free_tx;
 728         }
 729
 730         INIT_LIST_HEAD(&bpmp->mrqs);
 731         spin_lock_init(&bpmp->lock);
 732
 733         bpmp->threaded.count = bpmp->soc->channels.thread.count;
 734         sema_init(&bpmp->threaded.lock, bpmp->threaded.count);
 735
 736         size = BITS_TO_LONGS(bpmp->threaded.count) * sizeof(long);
 737
 738         bpmp->threaded.allocated = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 739         if (!bpmp->threaded.allocated) {
 740                 err = -ENOMEM;
 741                 goto free_rx;
 742         }
 743
 744         bpmp->threaded.busy = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 745         if (!bpmp->threaded.busy) {
 746                 err = -ENOMEM;
 747                 goto free_rx;
 748         }
 749
 750         bpmp->num_channels = bpmp->soc->channels.cpu_tx.count +
 751                              bpmp->soc->channels.thread.count +
 752                              bpmp->soc->channels.cpu_rx.count;
 753
 754         bpmp->channels = devm_kcalloc(&pdev->dev, bpmp->num_channels,
 755                                       sizeof(*channel), GFP_KERNEL);
 756         if (!bpmp->channels) {
 757                 err = -ENOMEM;
 758                 goto free_rx;
 759         }
 760
 761         /* message channel initialization */
 762         for (i = 0; i < bpmp->num_channels; i++) {
 763                 struct tegra_bpmp_channel *channel = &bpmp->channels[i];
 764
 765                 err = tegra_bpmp_channel_init(channel, bpmp, i);
 766                 if (err < 0)
 767                         goto cleanup_channels;
 768         }
 769
 770         /* mbox registration */
 771         bpmp->mbox.client.dev = &pdev->dev;
 772         bpmp->mbox.client.rx_callback = tegra_bpmp_handle_rx;
 773         bpmp->mbox.client.tx_block = false;
 774         bpmp->mbox.client.knows_txdone = false;
 775
 776         bpmp->mbox.channel = mbox_request_channel(&bpmp->mbox.client, 0);
 777         if (IS_ERR(bpmp->mbox.channel)) {
 778                 err = PTR_ERR(bpmp->mbox.channel);
 779                 dev_err(&pdev->dev, "failed to get HSP mailbox: %d\n", err);
 780                 goto cleanup_channels;
 781         }
 782
 783         /* reset message channels */
 784         for (i = 0; i < bpmp->num_channels; i++) {
 785                 struct tegra_bpmp_channel *channel = &bpmp->channels[i];
 786
 787                 tegra_bpmp_channel_reset(channel);
 788         }
 789
 790         err = tegra_bpmp_request_mrq(bpmp, MRQ_PING,
 791                                      tegra_bpmp_mrq_handle_ping, bpmp);
 792         if (err < 0)
 793                 goto free_mbox;
 794
 795         err = tegra_bpmp_ping(bpmp);
 796         if (err < 0) {
 797                 dev_err(&pdev->dev, "failed to ping BPMP: %d\n", err);
 798                 goto free_mrq;
 799         }
 800
 801         err = tegra_bpmp_get_firmware_tag(bpmp, tag, sizeof(tag) - 1);
 802         if (err < 0) {
 803                 dev_err(&pdev->dev, "failed to get firmware tag: %d\n", err);
 804                 goto free_mrq;
 805         }
 806
 807         dev_info(&pdev->dev, "firmware: %s\n", tag);
 808
 809         platform_set_drvdata(pdev, bpmp);
 810
 811         err = of_platform_default_populate(pdev->dev.of_node, NULL, &pdev->dev);
 812         if (err < 0)
 813                 goto free_mrq;
 814
 815         err = tegra_bpmp_init_clocks(bpmp);
 816         if (err < 0)
 817                 goto free_mrq;
 818
 819         err = tegra_bpmp_init_resets(bpmp);
 820         if (err < 0)
 821                 goto free_mrq;
 822
 823         err = tegra_bpmp_init_powergates(bpmp);
 824         if (err < 0)
 825                 goto free_mrq;
 826
 827         return 0;
 828
 829 free_mrq:
 830         tegra_bpmp_free_mrq(bpmp, MRQ_PING, bpmp);
 831 free_mbox:
 832         mbox_free_channel(bpmp->mbox.channel);
 833 cleanup_channels:
 834         while (i--)
 835                 tegra_bpmp_channel_cleanup(&bpmp->channels[i]);
 836 free_rx:
 837         gen_pool_free(bpmp->rx.pool, (unsigned long)bpmp->rx.virt, 4096);
 838 free_tx:
 839         gen_pool_free(bpmp->tx.pool, (unsigned long)bpmp->tx.virt, 4096);
 840         return err;
 841 }
 842
 843 static const struct tegra_bpmp_soc tegra186_soc = {
 844         .channels = {
 845                 .cpu_tx = {
 846                         .offset = 0,
 847                         .count = 6,
 848                         .timeout = 60 * USEC_PER_SEC,
 849                 },
 850                 .thread = {
 851                         .offset = 6,
 852                         .count = 7,
 853                         .timeout = 600 * USEC_PER_SEC,
 854                 },
 855                 .cpu_rx = {
 856                         .offset = 13,
 857                         .count = 1,
 858                         .timeout = 0,
 859                 },
 860         },
 861         .num_resets = 193,
 862 };
 863
 864 static const struct of_device_id tegra_bpmp_match[] = {
 865         { .compatible = "nvidia,tegra186-bpmp", .data = &tegra186_soc },
 866         { }
 867 };
 868
 869 static struct platform_driver tegra_bpmp_driver = {
 870         .driver = {
 871                 .name = "tegra-bpmp",
 872                 .of_match_table = tegra_bpmp_match,
 873         },
 874         .probe = tegra_bpmp_probe,
 875 };
 876
 877 static int __init tegra_bpmp_init(void)
 878 {
 879         return platform_driver_register(&tegra_bpmp_driver);
 880 }
 881 core_initcall(tegra_bpmp_init);