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                 return index;
 216
 217         spin_lock_irqsave(&bpmp->lock, flags);
 218         err = __tegra_bpmp_channel_read(channel, data, size);
 219         clear_bit(index, bpmp->threaded.allocated);
 220         spin_unlock_irqrestore(&bpmp->lock, flags);
 221
 222         up(&bpmp->threaded.lock);
 223
 224         return err;
 225 }
 226
 227 static ssize_t __tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel,
 228                                           unsigned int mrq, unsigned long flags,
 229                                           const void *data, size_t size)
 230 {
 231         channel->ob->code = mrq;
 232         channel->ob->flags = flags;
 233
 234         if (data && size > 0)
 235                 memcpy(channel->ob->data, data, size);
 236
 237         return tegra_ivc_write_advance(channel->ivc);
 238 }
 239
 240 static struct tegra_bpmp_channel *
 241 tegra_bpmp_write_threaded(struct tegra_bpmp *bpmp, unsigned int mrq,
 242                           const void *data, size_t size)
 243 {
 244         unsigned long timeout = bpmp->soc->channels.thread.timeout;
 245         unsigned int count = bpmp->soc->channels.thread.count;
 246         struct tegra_bpmp_channel *channel;
 247         unsigned long flags;
 248         unsigned int index;
 249         int err;
 250
 251         err = down_timeout(&bpmp->threaded.lock, usecs_to_jiffies(timeout));
 252         if (err < 0)
 253                 return ERR_PTR(err);
 254
 255         spin_lock_irqsave(&bpmp->lock, flags);
 256
 257         index = find_first_zero_bit(bpmp->threaded.allocated, count);
 258         if (index == count) {
 259                 channel = ERR_PTR(-EBUSY);
 260                 goto unlock;
 261         }
 262
 263         channel = tegra_bpmp_channel_get_thread(bpmp, index);
 264         if (!channel) {
 265                 channel = ERR_PTR(-EINVAL);
 266                 goto unlock;
 267         }
 268
 269         if (!tegra_bpmp_master_free(channel)) {
 270                 channel = ERR_PTR(-EBUSY);
 271                 goto unlock;
 272         }
 273
 274         set_bit(index, bpmp->threaded.allocated);
 275
 276         err = __tegra_bpmp_channel_write(channel, mrq, MSG_ACK | MSG_RING,
 277                                          data, size);
 278         if (err < 0) {
 279                 clear_bit(index, bpmp->threaded.allocated);
 280                 goto unlock;
 281         }
 282
 283         set_bit(index, bpmp->threaded.busy);
 284
 285 unlock:
 286         spin_unlock_irqrestore(&bpmp->lock, flags);
 287         return channel;
 288 }
 289
 290 static ssize_t tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel,
 291                                         unsigned int mrq, unsigned long flags,
 292                                         const void *data, size_t size)
 293 {
 294         int err;
 295
 296         err = tegra_bpmp_wait_master_free(channel);
 297         if (err < 0)
 298                 return err;
 299
 300         return __tegra_bpmp_channel_write(channel, mrq, flags, data, size);
 301 }
 302
 303 int tegra_bpmp_transfer_atomic(struct tegra_bpmp *bpmp,
 304                                struct tegra_bpmp_message *msg)
 305 {
 306         struct tegra_bpmp_channel *channel;
 307         int err;
 308
 309         if (WARN_ON(!irqs_disabled()))
 310                 return -EPERM;
 311
 312         if (!tegra_bpmp_message_valid(msg))
 313                 return -EINVAL;
 314
 315         channel = tegra_bpmp_channel_get_tx(bpmp);
 316
 317         err = tegra_bpmp_channel_write(channel, msg->mrq, MSG_ACK,
 318                                        msg->tx.data, msg->tx.size);
 319         if (err < 0)
 320                 return err;
 321
 322         err = mbox_send_message(bpmp->mbox.channel, NULL);
 323         if (err < 0)
 324                 return err;
 325
 326         mbox_client_txdone(bpmp->mbox.channel, 0);
 327
 328         err = tegra_bpmp_wait_ack(channel);
 329         if (err < 0)
 330                 return err;
 331
 332         return __tegra_bpmp_channel_read(channel, msg->rx.data, msg->rx.size);
 333 }
 334 EXPORT_SYMBOL_GPL(tegra_bpmp_transfer_atomic);
 335
 336 int tegra_bpmp_transfer(struct tegra_bpmp *bpmp,
 337                         struct tegra_bpmp_message *msg)
 338 {
 339         struct tegra_bpmp_channel *channel;
 340         unsigned long timeout;
 341         int err;
 342
 343         if (WARN_ON(irqs_disabled()))
 344                 return -EPERM;
 345
 346         if (!tegra_bpmp_message_valid(msg))
 347                 return -EINVAL;
 348
 349         channel = tegra_bpmp_write_threaded(bpmp, msg->mrq, msg->tx.data,
 350                                             msg->tx.size);
 351         if (IS_ERR(channel))
 352                 return PTR_ERR(channel);
 353
 354         err = mbox_send_message(bpmp->mbox.channel, NULL);
 355         if (err < 0)
 356                 return err;
 357
 358         mbox_client_txdone(bpmp->mbox.channel, 0);
 359
 360         timeout = usecs_to_jiffies(bpmp->soc->channels.thread.timeout);
 361
 362         err = wait_for_completion_timeout(&channel->completion, timeout);
 363         if (err == 0)
 364                 return -ETIMEDOUT;
 365
 366         return tegra_bpmp_channel_read(channel, msg->rx.data, msg->rx.size);
 367 }
 368 EXPORT_SYMBOL_GPL(tegra_bpmp_transfer);
 369
 370 static struct tegra_bpmp_mrq *tegra_bpmp_find_mrq(struct tegra_bpmp *bpmp,
 371                                                   unsigned int mrq)
 372 {
 373         struct tegra_bpmp_mrq *entry;
 374
 375         list_for_each_entry(entry, &bpmp->mrqs, list)
 376                 if (entry->mrq == mrq)
 377                         return entry;
 378
 379         return NULL;
 380 }
 381
 382 static void tegra_bpmp_mrq_return(struct tegra_bpmp_channel *channel,
 383                                   int code, const void *data, size_t size)
 384 {
 385         unsigned long flags = channel->ib->flags;
 386         struct tegra_bpmp *bpmp = channel->bpmp;
 387         struct tegra_bpmp_mb_data *frame;
 388         int err;
 389
 390         if (WARN_ON(size > MSG_DATA_MIN_SZ))
 391                 return;
 392
 393         err = tegra_ivc_read_advance(channel->ivc);
 394         if (WARN_ON(err < 0))
 395                 return;
 396
 397         if ((flags & MSG_ACK) == 0)
 398                 return;
 399
 400         frame = tegra_ivc_write_get_next_frame(channel->ivc);
 401         if (WARN_ON(IS_ERR(frame)))
 402                 return;
 403
 404         frame->code = code;
 405
 406         if (data && size > 0)
 407                 memcpy(frame->data, data, size);
 408
 409         err = tegra_ivc_write_advance(channel->ivc);
 410         if (WARN_ON(err < 0))
 411                 return;
 412
 413         if (flags & MSG_RING) {
 414                 err = mbox_send_message(bpmp->mbox.channel, NULL);
 415                 if (WARN_ON(err < 0))
 416                         return;
 417
 418                 mbox_client_txdone(bpmp->mbox.channel, 0);
 419         }
 420 }
 421
 422 static void tegra_bpmp_handle_mrq(struct tegra_bpmp *bpmp,
 423                                   unsigned int mrq,
 424                                   struct tegra_bpmp_channel *channel)
 425 {
 426         struct tegra_bpmp_mrq *entry;
 427         u32 zero = 0;
 428
 429         spin_lock(&bpmp->lock);
 430
 431         entry = tegra_bpmp_find_mrq(bpmp, mrq);
 432         if (!entry) {
 433                 spin_unlock(&bpmp->lock);
 434                 tegra_bpmp_mrq_return(channel, -EINVAL, &zero, sizeof(zero));
 435                 return;
 436         }
 437
 438         entry->handler(mrq, channel, entry->data);
 439
 440         spin_unlock(&bpmp->lock);
 441 }
 442
 443 int tegra_bpmp_request_mrq(struct tegra_bpmp *bpmp, unsigned int mrq,
 444                            tegra_bpmp_mrq_handler_t handler, void *data)
 445 {
 446         struct tegra_bpmp_mrq *entry;
 447         unsigned long flags;
 448
 449         if (!handler)
 450                 return -EINVAL;
 451
 452         entry = devm_kzalloc(bpmp->dev, sizeof(*entry), GFP_KERNEL);
 453         if (!entry)
 454                 return -ENOMEM;
 455
 456         spin_lock_irqsave(&bpmp->lock, flags);
 457
 458         entry->mrq = mrq;
 459         entry->handler = handler;
 460         entry->data = data;
 461         list_add(&entry->list, &bpmp->mrqs);
 462
 463         spin_unlock_irqrestore(&bpmp->lock, flags);
 464
 465         return 0;
 466 }
 467 EXPORT_SYMBOL_GPL(tegra_bpmp_request_mrq);
 468
 469 void tegra_bpmp_free_mrq(struct tegra_bpmp *bpmp, unsigned int mrq, void *data)
 470 {
 471         struct tegra_bpmp_mrq *entry;
 472         unsigned long flags;
 473
 474         spin_lock_irqsave(&bpmp->lock, flags);
 475
 476         entry = tegra_bpmp_find_mrq(bpmp, mrq);
 477         if (!entry)
 478                 goto unlock;
 479
 480         list_del(&entry->list);
 481         devm_kfree(bpmp->dev, entry);
 482
 483 unlock:
 484         spin_unlock_irqrestore(&bpmp->lock, flags);
 485 }
 486 EXPORT_SYMBOL_GPL(tegra_bpmp_free_mrq);
 487
 488 static void tegra_bpmp_mrq_handle_ping(unsigned int mrq,
 489                                        struct tegra_bpmp_channel *channel,
 490                                        void *data)
 491 {
 492         struct mrq_ping_request *request;
 493         struct mrq_ping_response response;
 494
 495         request = (struct mrq_ping_request *)channel->ib->data;
 496
 497         memset(&response, 0, sizeof(response));
 498         response.reply = request->challenge << 1;
 499
 500         tegra_bpmp_mrq_return(channel, 0, &response, sizeof(response));
 501 }
 502
 503 static int tegra_bpmp_ping(struct tegra_bpmp *bpmp)
 504 {
 505         struct mrq_ping_response response;
 506         struct mrq_ping_request request;
 507         struct tegra_bpmp_message msg;
 508         unsigned long flags;
 509         ktime_t start, end;
 510         int err;
 511
 512         memset(&request, 0, sizeof(request));
 513         request.challenge = 1;
 514
 515         memset(&response, 0, sizeof(response));
 516
 517         memset(&msg, 0, sizeof(msg));
 518         msg.mrq = MRQ_PING;
 519         msg.tx.data = &request;
 520         msg.tx.size = sizeof(request);
 521         msg.rx.data = &response;
 522         msg.rx.size = sizeof(response);
 523
 524         local_irq_save(flags);
 525         start = ktime_get();
 526         err = tegra_bpmp_transfer_atomic(bpmp, &msg);
 527         end = ktime_get();
 528         local_irq_restore(flags);
 529
 530         if (!err)
 531                 dev_dbg(bpmp->dev,
 532                         "ping ok: challenge: %u, response: %u, time: %lld\n",
 533                         request.challenge, response.reply,
 534                         ktime_to_us(ktime_sub(end, start)));
 535
 536         return err;
 537 }
 538
 539 static int tegra_bpmp_get_firmware_tag(struct tegra_bpmp *bpmp, char *tag,
 540                                        size_t size)
 541 {
 542         struct mrq_query_tag_request request;
 543         struct tegra_bpmp_message msg;
 544         unsigned long flags;
 545         dma_addr_t phys;
 546         void *virt;
 547         int err;
 548
 549         virt = dma_alloc_coherent(bpmp->dev, MSG_DATA_MIN_SZ, &phys,
 550                                   GFP_KERNEL | GFP_DMA32);
 551         if (!virt)
 552                 return -ENOMEM;
 553
 554         memset(&request, 0, sizeof(request));
 555         request.addr = phys;
 556
 557         memset(&msg, 0, sizeof(msg));
 558         msg.mrq = MRQ_QUERY_TAG;
 559         msg.tx.data = &request;
 560         msg.tx.size = sizeof(request);
 561
 562         local_irq_save(flags);
 563         err = tegra_bpmp_transfer_atomic(bpmp, &msg);
 564         local_irq_restore(flags);
 565
 566         if (err == 0)
 567                 strlcpy(tag, virt, size);
 568
 569         dma_free_coherent(bpmp->dev, MSG_DATA_MIN_SZ, virt, phys);
 570
 571         return err;
 572 }
 573
 574 static void tegra_bpmp_channel_signal(struct tegra_bpmp_channel *channel)
 575 {
 576         unsigned long flags = channel->ob->flags;
 577
 578         if ((flags & MSG_RING) == 0)
 579                 return;
 580
 581         complete(&channel->completion);
 582 }
 583
 584 static void tegra_bpmp_handle_rx(struct mbox_client *client, void *data)
 585 {
 586         struct tegra_bpmp *bpmp = mbox_client_to_bpmp(client);
 587         struct tegra_bpmp_channel *channel;
 588         unsigned int i, count;
 589         unsigned long *busy;
 590
 591         channel = tegra_bpmp_channel_get_rx(bpmp);
 592         count = bpmp->soc->channels.thread.count;
 593         busy = bpmp->threaded.busy;
 594
 595         if (tegra_bpmp_master_acked(channel))
 596                 tegra_bpmp_handle_mrq(bpmp, channel->ib->code, channel);
 597
 598         spin_lock(&bpmp->lock);
 599
 600         for_each_set_bit(i, busy, count) {
 601                 struct tegra_bpmp_channel *channel;
 602
 603                 channel = tegra_bpmp_channel_get_thread(bpmp, i);
 604                 if (!channel)
 605                         continue;
 606
 607                 if (tegra_bpmp_master_acked(channel)) {
 608                         tegra_bpmp_channel_signal(channel);
 609                         clear_bit(i, busy);
 610                 }
 611         }
 612
 613         spin_unlock(&bpmp->lock);
 614 }
 615
 616 static void tegra_bpmp_ivc_notify(struct tegra_ivc *ivc, void *data)
 617 {
 618         struct tegra_bpmp *bpmp = data;
 619         int err;
 620
 621         if (WARN_ON(bpmp->mbox.channel == NULL))
 622                 return;
 623
 624         err = mbox_send_message(bpmp->mbox.channel, NULL);
 625         if (err < 0)
 626                 return;
 627
 628         mbox_client_txdone(bpmp->mbox.channel, 0);
 629 }
 630
 631 static int tegra_bpmp_channel_init(struct tegra_bpmp_channel *channel,
 632                                    struct tegra_bpmp *bpmp,
 633                                    unsigned int index)
 634 {
 635         size_t message_size, queue_size;
 636         unsigned int offset;
 637         int err;
 638
 639         channel->ivc = devm_kzalloc(bpmp->dev, sizeof(*channel->ivc),
 640                                     GFP_KERNEL);
 641         if (!channel->ivc)
 642                 return -ENOMEM;
 643
 644         message_size = tegra_ivc_align(MSG_MIN_SZ);
 645         queue_size = tegra_ivc_total_queue_size(message_size);
 646         offset = queue_size * index;
 647
 648         err = tegra_ivc_init(channel->ivc, NULL,
 649                              bpmp->rx.virt + offset, bpmp->rx.phys + offset,
 650                              bpmp->tx.virt + offset, bpmp->tx.phys + offset,
 651                              1, message_size, tegra_bpmp_ivc_notify,
 652                              bpmp);
 653         if (err < 0) {
 654                 dev_err(bpmp->dev, "failed to setup IVC for channel %u: %d\n",
 655                         index, err);
 656                 return err;
 657         }
 658
 659         init_completion(&channel->completion);
 660         channel->bpmp = bpmp;
 661
 662         return 0;
 663 }
 664
 665 static void tegra_bpmp_channel_reset(struct tegra_bpmp_channel *channel)
 666 {
 667         /* reset the channel state */
 668         tegra_ivc_reset(channel->ivc);
 669
 670         /* sync the channel state with BPMP */
 671         while (tegra_ivc_notified(channel->ivc))
 672                 ;
 673 }
 674
 675 static void tegra_bpmp_channel_cleanup(struct tegra_bpmp_channel *channel)
 676 {
 677         tegra_ivc_cleanup(channel->ivc);
 678 }
 679
 680 static int tegra_bpmp_probe(struct platform_device *pdev)
 681 {
 682         struct tegra_bpmp_channel *channel;
 683         struct tegra_bpmp *bpmp;
 684         unsigned int i;
 685         char tag[32];
 686         size_t size;
 687         int err;
 688
 689         bpmp = devm_kzalloc(&pdev->dev, sizeof(*bpmp), GFP_KERNEL);
 690         if (!bpmp)
 691                 return -ENOMEM;
 692
 693         bpmp->soc = of_device_get_match_data(&pdev->dev);
 694         bpmp->dev = &pdev->dev;
 695
 696         bpmp->tx.pool = of_gen_pool_get(pdev->dev.of_node, "shmem", 0);
 697         if (!bpmp->tx.pool) {
 698                 dev_err(&pdev->dev, "TX shmem pool not found\n");
 699                 return -ENOMEM;
 700         }
 701
 702         bpmp->tx.virt = gen_pool_dma_alloc(bpmp->tx.pool, 4096, &bpmp->tx.phys);
 703         if (!bpmp->tx.virt) {
 704                 dev_err(&pdev->dev, "failed to allocate from TX pool\n");
 705                 return -ENOMEM;
 706         }
 707
 708         bpmp->rx.pool = of_gen_pool_get(pdev->dev.of_node, "shmem", 1);
 709         if (!bpmp->rx.pool) {
 710                 dev_err(&pdev->dev, "RX shmem pool not found\n");
 711                 err = -ENOMEM;
 712                 goto free_tx;
 713         }
 714
 715         bpmp->rx.virt = gen_pool_dma_alloc(bpmp->rx.pool, 4096, &bpmp->rx.phys);
 716         if (!bpmp->rx.pool) {
 717                 dev_err(&pdev->dev, "failed to allocate from RX pool\n");
 718                 err = -ENOMEM;
 719                 goto free_tx;
 720         }
 721
 722         INIT_LIST_HEAD(&bpmp->mrqs);
 723         spin_lock_init(&bpmp->lock);
 724
 725         bpmp->threaded.count = bpmp->soc->channels.thread.count;
 726         sema_init(&bpmp->threaded.lock, bpmp->threaded.count);
 727
 728         size = BITS_TO_LONGS(bpmp->threaded.count) * sizeof(long);
 729
 730         bpmp->threaded.allocated = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 731         if (!bpmp->threaded.allocated) {
 732                 err = -ENOMEM;
 733                 goto free_rx;
 734         }
 735
 736         bpmp->threaded.busy = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 737         if (!bpmp->threaded.busy) {
 738                 err = -ENOMEM;
 739                 goto free_rx;
 740         }
 741
 742         bpmp->num_channels = bpmp->soc->channels.cpu_tx.count +
 743                              bpmp->soc->channels.thread.count +
 744                              bpmp->soc->channels.cpu_rx.count;
 745
 746         bpmp->channels = devm_kcalloc(&pdev->dev, bpmp->num_channels,
 747                                       sizeof(*channel), GFP_KERNEL);
 748         if (!bpmp->channels) {
 749                 err = -ENOMEM;
 750                 goto free_rx;
 751         }
 752
 753         /* message channel initialization */
 754         for (i = 0; i < bpmp->num_channels; i++) {
 755                 struct tegra_bpmp_channel *channel = &bpmp->channels[i];
 756
 757                 err = tegra_bpmp_channel_init(channel, bpmp, i);
 758                 if (err < 0)
 759                         goto cleanup_channels;
 760         }
 761
 762         /* mbox registration */
 763         bpmp->mbox.client.dev = &pdev->dev;
 764         bpmp->mbox.client.rx_callback = tegra_bpmp_handle_rx;
 765         bpmp->mbox.client.tx_block = false;
 766         bpmp->mbox.client.knows_txdone = false;
 767
 768         bpmp->mbox.channel = mbox_request_channel(&bpmp->mbox.client, 0);
 769         if (IS_ERR(bpmp->mbox.channel)) {
 770                 err = PTR_ERR(bpmp->mbox.channel);
 771                 dev_err(&pdev->dev, "failed to get HSP mailbox: %d\n", err);
 772                 goto cleanup_channels;
 773         }
 774
 775         /* reset message channels */
 776         for (i = 0; i < bpmp->num_channels; i++) {
 777                 struct tegra_bpmp_channel *channel = &bpmp->channels[i];
 778
 779                 tegra_bpmp_channel_reset(channel);
 780         }
 781
 782         err = tegra_bpmp_request_mrq(bpmp, MRQ_PING,
 783                                      tegra_bpmp_mrq_handle_ping, bpmp);
 784         if (err < 0)
 785                 goto free_mbox;
 786
 787         err = tegra_bpmp_ping(bpmp);
 788         if (err < 0) {
 789                 dev_err(&pdev->dev, "failed to ping BPMP: %d\n", err);
 790                 goto free_mrq;
 791         }
 792
 793         err = tegra_bpmp_get_firmware_tag(bpmp, tag, sizeof(tag) - 1);
 794         if (err < 0) {
 795                 dev_err(&pdev->dev, "failed to get firmware tag: %d\n", err);
 796                 goto free_mrq;
 797         }
 798
 799         dev_info(&pdev->dev, "firmware: %s\n", tag);
 800
 801         err = of_platform_default_populate(pdev->dev.of_node, NULL, &pdev->dev);
 802         if (err < 0)
 803                 goto free_mrq;
 804
 805         err = tegra_bpmp_init_clocks(bpmp);
 806         if (err < 0)
 807                 goto free_mrq;
 808
 809         err = tegra_bpmp_init_resets(bpmp);
 810         if (err < 0)
 811                 goto free_mrq;
 812
 813         platform_set_drvdata(pdev, bpmp);
 814
 815         return 0;
 816
 817 free_mrq:
 818         tegra_bpmp_free_mrq(bpmp, MRQ_PING, bpmp);
 819 free_mbox:
 820         mbox_free_channel(bpmp->mbox.channel);
 821 cleanup_channels:
 822         while (i--)
 823                 tegra_bpmp_channel_cleanup(&bpmp->channels[i]);
 824 free_rx:
 825         gen_pool_free(bpmp->rx.pool, (unsigned long)bpmp->rx.virt, 4096);
 826 free_tx:
 827         gen_pool_free(bpmp->tx.pool, (unsigned long)bpmp->tx.virt, 4096);
 828         return err;
 829 }
 830
 831 static const struct tegra_bpmp_soc tegra186_soc = {
 832         .channels = {
 833                 .cpu_tx = {
 834                         .offset = 0,
 835                         .count = 6,
 836                         .timeout = 60 * USEC_PER_SEC,
 837                 },
 838                 .thread = {
 839                         .offset = 6,
 840                         .count = 7,
 841                         .timeout = 600 * USEC_PER_SEC,
 842                 },
 843                 .cpu_rx = {
 844                         .offset = 13,
 845                         .count = 1,
 846                         .timeout = 0,
 847                 },
 848         },
 849         .num_resets = 193,
 850 };
 851
 852 static const struct of_device_id tegra_bpmp_match[] = {
 853         { .compatible = "nvidia,tegra186-bpmp", .data = &tegra186_soc },
 854         { }
 855 };
 856
 857 static struct platform_driver tegra_bpmp_driver = {
 858         .driver = {
 859                 .name = "tegra-bpmp",
 860                 .of_match_table = tegra_bpmp_match,
 861         },
 862         .probe = tegra_bpmp_probe,
 863 };
 864
 865 static int __init tegra_bpmp_init(void)
 866 {
 867         return platform_driver_register(&tegra_bpmp_driver);
 868 }
 869 core_initcall(tegra_bpmp_init);