drivers/thunderbolt/nhi.c

   1 /*
   2  * Thunderbolt Cactus Ridge driver - NHI driver
   3  *
   4  * The NHI (native host interface) is the pci device that allows us to send and
   5  * receive frames from the thunderbolt bus.
   6  *
   7  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
   8  */
   9
  10 #include <linux/pm_runtime.h>
  11 #include <linux/slab.h>
  12 #include <linux/errno.h>
  13 #include <linux/pci.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/dmi.h>
  17
  18 #include "nhi.h"
  19 #include "nhi_regs.h"
  20 #include "tb.h"
  21
  22 #define RING_TYPE(ring) ((ring)->is_tx ? "TX ring" : "RX ring")
  23
  24
  25 static int ring_interrupt_index(struct tb_ring *ring)
  26 {
  27         int bit = ring->hop;
  28         if (!ring->is_tx)
  29                 bit += ring->nhi->hop_count;
  30         return bit;
  31 }
  32
  33 /**
  34  * ring_interrupt_active() - activate/deactivate interrupts for a single ring
  35  *
  36  * ring->nhi->lock must be held.
  37  */
  38 static void ring_interrupt_active(struct tb_ring *ring, bool active)
  39 {
  40         int reg = REG_RING_INTERRUPT_BASE +
  41                   ring_interrupt_index(ring) / 32 * 4;
  42         int bit = ring_interrupt_index(ring) & 31;
  43         int mask = 1 << bit;
  44         u32 old, new;
  45         old = ioread32(ring->nhi->iobase + reg);
  46         if (active)
  47                 new = old | mask;
  48         else
  49                 new = old & ~mask;
  50
  51         dev_info(&ring->nhi->pdev->dev,
  52                  "%s interrupt at register %#x bit %d (%#x -> %#x)\n",
  53                  active ? "enabling" : "disabling", reg, bit, old, new);
  54
  55         if (new == old)
  56                 dev_WARN(&ring->nhi->pdev->dev,
  57                                          "interrupt for %s %d is already %s\n",
  58                                          RING_TYPE(ring), ring->hop,
  59                                          active ? "enabled" : "disabled");
  60         iowrite32(new, ring->nhi->iobase + reg);
  61 }
  62
  63 /**
  64  * nhi_disable_interrupts() - disable interrupts for all rings
  65  *
  66  * Use only during init and shutdown.
  67  */
  68 static void nhi_disable_interrupts(struct tb_nhi *nhi)
  69 {
  70         int i = 0;
  71         /* disable interrupts */
  72         for (i = 0; i < RING_INTERRUPT_REG_COUNT(nhi); i++)
  73                 iowrite32(0, nhi->iobase + REG_RING_INTERRUPT_BASE + 4 * i);
  74
  75         /* clear interrupt status bits */
  76         for (i = 0; i < RING_NOTIFY_REG_COUNT(nhi); i++)
  77                 ioread32(nhi->iobase + REG_RING_NOTIFY_BASE + 4 * i);
  78 }
  79
  80 /* ring helper methods */
  81
  82 static void __iomem *ring_desc_base(struct tb_ring *ring)
  83 {
  84         void __iomem *io = ring->nhi->iobase;
  85         io += ring->is_tx ? REG_TX_RING_BASE : REG_RX_RING_BASE;
  86         io += ring->hop * 16;
  87         return io;
  88 }
  89
  90 static void __iomem *ring_options_base(struct tb_ring *ring)
  91 {
  92         void __iomem *io = ring->nhi->iobase;
  93         io += ring->is_tx ? REG_TX_OPTIONS_BASE : REG_RX_OPTIONS_BASE;
  94         io += ring->hop * 32;
  95         return io;
  96 }
  97
  98 static void ring_iowrite16desc(struct tb_ring *ring, u32 value, u32 offset)
  99 {
 100         iowrite16(value, ring_desc_base(ring) + offset);
 101 }
 102
 103 static void ring_iowrite32desc(struct tb_ring *ring, u32 value, u32 offset)
 104 {
 105         iowrite32(value, ring_desc_base(ring) + offset);
 106 }
 107
 108 static void ring_iowrite64desc(struct tb_ring *ring, u64 value, u32 offset)
 109 {
 110         iowrite32(value, ring_desc_base(ring) + offset);
 111         iowrite32(value >> 32, ring_desc_base(ring) + offset + 4);
 112 }
 113
 114 static void ring_iowrite32options(struct tb_ring *ring, u32 value, u32 offset)
 115 {
 116         iowrite32(value, ring_options_base(ring) + offset);
 117 }
 118
 119 static bool ring_full(struct tb_ring *ring)
 120 {
 121         return ((ring->head + 1) % ring->size) == ring->tail;
 122 }
 123
 124 static bool ring_empty(struct tb_ring *ring)
 125 {
 126         return ring->head == ring->tail;
 127 }
 128
 129 /**
 130  * ring_write_descriptors() - post frames from ring->queue to the controller
 131  *
 132  * ring->lock is held.
 133  */
 134 static void ring_write_descriptors(struct tb_ring *ring)
 135 {
 136         struct ring_frame *frame, *n;
 137         struct ring_desc *descriptor;
 138         list_for_each_entry_safe(frame, n, &ring->queue, list) {
 139                 if (ring_full(ring))
 140                         break;
 141                 list_move_tail(&frame->list, &ring->in_flight);
 142                 descriptor = &ring->descriptors[ring->head];
 143                 descriptor->phys = frame->buffer_phy;
 144                 descriptor->time = 0;
 145                 descriptor->flags = RING_DESC_POSTED | RING_DESC_INTERRUPT;
 146                 if (ring->is_tx) {
 147                         descriptor->length = frame->size;
 148                         descriptor->eof = frame->eof;
 149                         descriptor->sof = frame->sof;
 150                 }
 151                 ring->head = (ring->head + 1) % ring->size;
 152                 ring_iowrite16desc(ring, ring->head, ring->is_tx ? 10 : 8);
 153         }
 154 }
 155
 156 /**
 157  * ring_work() - progress completed frames
 158  *
 159  * If the ring is shutting down then all frames are marked as canceled and
 160  * their callbacks are invoked.
 161  *
 162  * Otherwise we collect all completed frame from the ring buffer, write new
 163  * frame to the ring buffer and invoke the callbacks for the completed frames.
 164  */
 165 static void ring_work(struct work_struct *work)
 166 {
 167         struct tb_ring *ring = container_of(work, typeof(*ring), work);
 168         struct ring_frame *frame;
 169         bool canceled = false;
 170         LIST_HEAD(done);
 171         mutex_lock(&ring->lock);
 172
 173         if (!ring->running) {
 174                 /*  Move all frames to done and mark them as canceled. */
 175                 list_splice_tail_init(&ring->in_flight, &done);
 176                 list_splice_tail_init(&ring->queue, &done);
 177                 canceled = true;
 178                 goto invoke_callback;
 179         }
 180
 181         while (!ring_empty(ring)) {
 182                 if (!(ring->descriptors[ring->tail].flags
 183                                 & RING_DESC_COMPLETED))
 184                         break;
 185                 frame = list_first_entry(&ring->in_flight, typeof(*frame),
 186                                          list);
 187                 list_move_tail(&frame->list, &done);
 188                 if (!ring->is_tx) {
 189                         frame->size = ring->descriptors[ring->tail].length;
 190                         frame->eof = ring->descriptors[ring->tail].eof;
 191                         frame->sof = ring->descriptors[ring->tail].sof;
 192                         frame->flags = ring->descriptors[ring->tail].flags;
 193                         if (frame->sof != 0)
 194                                 dev_WARN(&ring->nhi->pdev->dev,
 195                                          "%s %d got unexpected SOF: %#x\n",
 196                                          RING_TYPE(ring), ring->hop,
 197                                          frame->sof);
 198                         /*
 199                          * known flags:
 200                          * raw not enabled, interupt not set: 0x2=0010
 201                          * raw enabled: 0xa=1010
 202                          * raw not enabled: 0xb=1011
 203                          * partial frame (>MAX_FRAME_SIZE): 0xe=1110
 204                          */
 205                         if (frame->flags != 0xa)
 206                                 dev_WARN(&ring->nhi->pdev->dev,
 207                                          "%s %d got unexpected flags: %#x\n",
 208                                          RING_TYPE(ring), ring->hop,
 209                                          frame->flags);
 210                 }
 211                 ring->tail = (ring->tail + 1) % ring->size;
 212         }
 213         ring_write_descriptors(ring);
 214
 215 invoke_callback:
 216         mutex_unlock(&ring->lock); /* allow callbacks to schedule new work */
 217         while (!list_empty(&done)) {
 218                 frame = list_first_entry(&done, typeof(*frame), list);
 219                 /*
 220                  * The callback may reenqueue or delete frame.
 221                  * Do not hold on to it.
 222                  */
 223                 list_del_init(&frame->list);
 224                 frame->callback(ring, frame, canceled);
 225         }
 226 }
 227
 228 int __ring_enqueue(struct tb_ring *ring, struct ring_frame *frame)
 229 {
 230         int ret = 0;
 231         mutex_lock(&ring->lock);
 232         if (ring->running) {
 233                 list_add_tail(&frame->list, &ring->queue);
 234                 ring_write_descriptors(ring);
 235         } else {
 236                 ret = -ESHUTDOWN;
 237         }
 238         mutex_unlock(&ring->lock);
 239         return ret;
 240 }
 241
 242 static struct tb_ring *ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
 243                                   bool transmit)
 244 {
 245         struct tb_ring *ring = NULL;
 246         dev_info(&nhi->pdev->dev, "allocating %s ring %d of size %d\n",
 247                  transmit ? "TX" : "RX", hop, size);
 248
 249         mutex_lock(&nhi->lock);
 250         if (hop >= nhi->hop_count) {
 251                 dev_WARN(&nhi->pdev->dev, "invalid hop: %d\n", hop);
 252                 goto err;
 253         }
 254         if (transmit && nhi->tx_rings[hop]) {
 255                 dev_WARN(&nhi->pdev->dev, "TX hop %d already allocated\n", hop);
 256                 goto err;
 257         } else if (!transmit && nhi->rx_rings[hop]) {
 258                 dev_WARN(&nhi->pdev->dev, "RX hop %d already allocated\n", hop);
 259                 goto err;
 260         }
 261         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 262         if (!ring)
 263                 goto err;
 264
 265         mutex_init(&ring->lock);
 266         INIT_LIST_HEAD(&ring->queue);
 267         INIT_LIST_HEAD(&ring->in_flight);
 268         INIT_WORK(&ring->work, ring_work);
 269
 270         ring->nhi = nhi;
 271         ring->hop = hop;
 272         ring->is_tx = transmit;
 273         ring->size = size;
 274         ring->head = 0;
 275         ring->tail = 0;
 276         ring->running = false;
 277         ring->descriptors = dma_alloc_coherent(&ring->nhi->pdev->dev,
 278                         size * sizeof(*ring->descriptors),
 279                         &ring->descriptors_dma, GFP_KERNEL | __GFP_ZERO);
 280         if (!ring->descriptors)
 281                 goto err;
 282
 283         if (transmit)
 284                 nhi->tx_rings[hop] = ring;
 285         else
 286                 nhi->rx_rings[hop] = ring;
 287         mutex_unlock(&nhi->lock);
 288         return ring;
 289
 290 err:
 291         if (ring)
 292                 mutex_destroy(&ring->lock);
 293         kfree(ring);
 294         mutex_unlock(&nhi->lock);
 295         return NULL;
 296 }
 297
 298 struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size)
 299 {
 300         return ring_alloc(nhi, hop, size, true);
 301 }
 302
 303 struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size)
 304 {
 305         return ring_alloc(nhi, hop, size, false);
 306 }
 307
 308 /**
 309  * ring_start() - enable a ring
 310  *
 311  * Must not be invoked in parallel with ring_stop().
 312  */
 313 void ring_start(struct tb_ring *ring)
 314 {
 315         mutex_lock(&ring->nhi->lock);
 316         mutex_lock(&ring->lock);
 317         if (ring->running) {
 318                 dev_WARN(&ring->nhi->pdev->dev, "ring already started\n");
 319                 goto err;
 320         }
 321         dev_info(&ring->nhi->pdev->dev, "starting %s %d\n",
 322                  RING_TYPE(ring), ring->hop);
 323
 324         ring_iowrite64desc(ring, ring->descriptors_dma, 0);
 325         if (ring->is_tx) {
 326                 ring_iowrite32desc(ring, ring->size, 12);
 327                 ring_iowrite32options(ring, 0, 4); /* time releated ? */
 328                 ring_iowrite32options(ring,
 329                                       RING_FLAG_ENABLE | RING_FLAG_RAW, 0);
 330         } else {
 331                 ring_iowrite32desc(ring,
 332                                    (TB_FRAME_SIZE << 16) | ring->size, 12);
 333                 ring_iowrite32options(ring, 0xffffffff, 4); /* SOF EOF mask */
 334                 ring_iowrite32options(ring,
 335                                       RING_FLAG_ENABLE | RING_FLAG_RAW, 0);
 336         }
 337         ring_interrupt_active(ring, true);
 338         ring->running = true;
 339 err:
 340         mutex_unlock(&ring->lock);
 341         mutex_unlock(&ring->nhi->lock);
 342 }
 343
 344
 345 /**
 346  * ring_stop() - shutdown a ring
 347  *
 348  * Must not be invoked from a callback.
 349  *
 350  * This method will disable the ring. Further calls to ring_tx/ring_rx will
 351  * return -ESHUTDOWN until ring_stop has been called.
 352  *
 353  * All enqueued frames will be canceled and their callbacks will be executed
 354  * with frame->canceled set to true (on the callback thread). This method
 355  * returns only after all callback invocations have finished.
 356  */
 357 void ring_stop(struct tb_ring *ring)
 358 {
 359         mutex_lock(&ring->nhi->lock);
 360         mutex_lock(&ring->lock);
 361         dev_info(&ring->nhi->pdev->dev, "stopping %s %d\n",
 362                  RING_TYPE(ring), ring->hop);
 363         if (!ring->running) {
 364                 dev_WARN(&ring->nhi->pdev->dev, "%s %d already stopped\n",
 365                          RING_TYPE(ring), ring->hop);
 366                 goto err;
 367         }
 368         ring_interrupt_active(ring, false);
 369
 370         ring_iowrite32options(ring, 0, 0);
 371         ring_iowrite64desc(ring, 0, 0);
 372         ring_iowrite16desc(ring, 0, ring->is_tx ? 10 : 8);
 373         ring_iowrite32desc(ring, 0, 12);
 374         ring->head = 0;
 375         ring->tail = 0;
 376         ring->running = false;
 377
 378 err:
 379         mutex_unlock(&ring->lock);
 380         mutex_unlock(&ring->nhi->lock);
 381
 382         /*
 383          * schedule ring->work to invoke callbacks on all remaining frames.
 384          */
 385         schedule_work(&ring->work);
 386         flush_work(&ring->work);
 387 }
 388
 389 /*
 390  * ring_free() - free ring
 391  *
 392  * When this method returns all invocations of ring->callback will have
 393  * finished.
 394  *
 395  * Ring must be stopped.
 396  *
 397  * Must NOT be called from ring_frame->callback!
 398  */
 399 void ring_free(struct tb_ring *ring)
 400 {
 401         mutex_lock(&ring->nhi->lock);
 402         /*
 403          * Dissociate the ring from the NHI. This also ensures that
 404          * nhi_interrupt_work cannot reschedule ring->work.
 405          */
 406         if (ring->is_tx)
 407                 ring->nhi->tx_rings[ring->hop] = NULL;
 408         else
 409                 ring->nhi->rx_rings[ring->hop] = NULL;
 410
 411         if (ring->running) {
 412                 dev_WARN(&ring->nhi->pdev->dev, "%s %d still running\n",
 413                          RING_TYPE(ring), ring->hop);
 414         }
 415
 416         dma_free_coherent(&ring->nhi->pdev->dev,
 417                           ring->size * sizeof(*ring->descriptors),
 418                           ring->descriptors, ring->descriptors_dma);
 419
 420         ring->descriptors = NULL;
 421         ring->descriptors_dma = 0;
 422
 423
 424         dev_info(&ring->nhi->pdev->dev,
 425                  "freeing %s %d\n",
 426                  RING_TYPE(ring),
 427                  ring->hop);
 428
 429         mutex_unlock(&ring->nhi->lock);
 430         /**
 431          * ring->work can no longer be scheduled (it is scheduled only by
 432          * nhi_interrupt_work and ring_stop). Wait for it to finish before
 433          * freeing the ring.
 434          */
 435         flush_work(&ring->work);
 436         mutex_destroy(&ring->lock);
 437         kfree(ring);
 438 }
 439
 440 static void nhi_interrupt_work(struct work_struct *work)
 441 {
 442         struct tb_nhi *nhi = container_of(work, typeof(*nhi), interrupt_work);
 443         int value = 0; /* Suppress uninitialized usage warning. */
 444         int bit;
 445         int hop = -1;
 446         int type = 0; /* current interrupt type 0: TX, 1: RX, 2: RX overflow */
 447         struct tb_ring *ring;
 448
 449         mutex_lock(&nhi->lock);
 450
 451         /*
 452          * Starting at REG_RING_NOTIFY_BASE there are three status bitfields
 453          * (TX, RX, RX overflow). We iterate over the bits and read a new
 454          * dwords as required. The registers are cleared on read.
 455          */
 456         for (bit = 0; bit < 3 * nhi->hop_count; bit++) {
 457                 if (bit % 32 == 0)
 458                         value = ioread32(nhi->iobase
 459                                          + REG_RING_NOTIFY_BASE
 460                                          + 4 * (bit / 32));
 461                 if (++hop == nhi->hop_count) {
 462                         hop = 0;
 463                         type++;
 464                 }
 465                 if ((value & (1 << (bit % 32))) == 0)
 466                         continue;
 467                 if (type == 2) {
 468                         dev_warn(&nhi->pdev->dev,
 469                                  "RX overflow for ring %d\n",
 470                                  hop);
 471                         continue;
 472                 }
 473                 if (type == 0)
 474                         ring = nhi->tx_rings[hop];
 475                 else
 476                         ring = nhi->rx_rings[hop];
 477                 if (ring == NULL) {
 478                         dev_warn(&nhi->pdev->dev,
 479                                  "got interrupt for inactive %s ring %d\n",
 480                                  type ? "RX" : "TX",
 481                                  hop);
 482                         continue;
 483                 }
 484                 /* we do not check ring->running, this is done in ring->work */
 485                 schedule_work(&ring->work);
 486         }
 487         mutex_unlock(&nhi->lock);
 488 }
 489
 490 static irqreturn_t nhi_msi(int irq, void *data)
 491 {
 492         struct tb_nhi *nhi = data;
 493         schedule_work(&nhi->interrupt_work);
 494         return IRQ_HANDLED;
 495 }
 496
 497 static int nhi_suspend_noirq(struct device *dev)
 498 {
 499         struct pci_dev *pdev = to_pci_dev(dev);
 500         struct tb *tb = pci_get_drvdata(pdev);
 501         thunderbolt_suspend(tb);
 502         return 0;
 503 }
 504
 505 static int nhi_resume_noirq(struct device *dev)
 506 {
 507         struct pci_dev *pdev = to_pci_dev(dev);
 508         struct tb *tb = pci_get_drvdata(pdev);
 509         thunderbolt_resume(tb);
 510         return 0;
 511 }
 512
 513 static void nhi_shutdown(struct tb_nhi *nhi)
 514 {
 515         int i;
 516         dev_info(&nhi->pdev->dev, "shutdown\n");
 517
 518         for (i = 0; i < nhi->hop_count; i++) {
 519                 if (nhi->tx_rings[i])
 520                         dev_WARN(&nhi->pdev->dev,
 521                                  "TX ring %d is still active\n", i);
 522                 if (nhi->rx_rings[i])
 523                         dev_WARN(&nhi->pdev->dev,
 524                                  "RX ring %d is still active\n", i);
 525         }
 526         nhi_disable_interrupts(nhi);
 527         /*
 528          * We have to release the irq before calling flush_work. Otherwise an
 529          * already executing IRQ handler could call schedule_work again.
 530          */
 531         devm_free_irq(&nhi->pdev->dev, nhi->pdev->irq, nhi);
 532         flush_work(&nhi->interrupt_work);
 533         mutex_destroy(&nhi->lock);
 534 }
 535
 536 static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 537 {
 538         struct tb_nhi *nhi;
 539         struct tb *tb;
 540         int res;
 541
 542         res = pcim_enable_device(pdev);
 543         if (res) {
 544                 dev_err(&pdev->dev, "cannot enable PCI device, aborting\n");
 545                 return res;
 546         }
 547
 548         res = pci_enable_msi(pdev);
 549         if (res) {
 550                 dev_err(&pdev->dev, "cannot enable MSI, aborting\n");
 551                 return res;
 552         }
 553
 554         res = pcim_iomap_regions(pdev, 1 << 0, "thunderbolt");
 555         if (res) {
 556                 dev_err(&pdev->dev, "cannot obtain PCI resources, aborting\n");
 557                 return res;
 558         }
 559
 560         nhi = devm_kzalloc(&pdev->dev, sizeof(*nhi), GFP_KERNEL);
 561         if (!nhi)
 562                 return -ENOMEM;
 563
 564         nhi->pdev = pdev;
 565         /* cannot fail - table is allocated bin pcim_iomap_regions */
 566         nhi->iobase = pcim_iomap_table(pdev)[0];
 567         nhi->hop_count = ioread32(nhi->iobase + REG_HOP_COUNT) & 0x3ff;
 568         if (nhi->hop_count != 12 && nhi->hop_count != 32)
 569                 dev_warn(&pdev->dev, "unexpected hop count: %d\n",
 570                          nhi->hop_count);
 571         INIT_WORK(&nhi->interrupt_work, nhi_interrupt_work);
 572
 573         nhi->tx_rings = devm_kcalloc(&pdev->dev, nhi->hop_count,
 574                                      sizeof(*nhi->tx_rings), GFP_KERNEL);
 575         nhi->rx_rings = devm_kcalloc(&pdev->dev, nhi->hop_count,
 576                                      sizeof(*nhi->rx_rings), GFP_KERNEL);
 577         if (!nhi->tx_rings || !nhi->rx_rings)
 578                 return -ENOMEM;
 579
 580         nhi_disable_interrupts(nhi); /* In case someone left them on. */
 581         res = devm_request_irq(&pdev->dev, pdev->irq, nhi_msi,
 582                                IRQF_NO_SUSPEND, /* must work during _noirq */
 583                                "thunderbolt", nhi);
 584         if (res) {
 585                 dev_err(&pdev->dev, "request_irq failed, aborting\n");
 586                 return res;
 587         }
 588
 589         mutex_init(&nhi->lock);
 590
 591         pci_set_master(pdev);
 592
 593         /* magic value - clock related? */
 594         iowrite32(3906250 / 10000, nhi->iobase + 0x38c00);
 595
 596         dev_info(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n");
 597         tb = thunderbolt_alloc_and_start(nhi);
 598         if (!tb) {
 599                 /*
 600                  * At this point the RX/TX rings might already have been
 601                  * activated. Do a proper shutdown.
 602                  */
 603                 nhi_shutdown(nhi);
 604                 return -EIO;
 605         }
 606         pci_set_drvdata(pdev, tb);
 607
 608         return 0;
 609 }
 610
 611 static void nhi_remove(struct pci_dev *pdev)
 612 {
 613         struct tb *tb = pci_get_drvdata(pdev);
 614         struct tb_nhi *nhi = tb->nhi;
 615         thunderbolt_shutdown_and_free(tb);
 616         nhi_shutdown(nhi);
 617 }
 618
 619 /*
 620  * The tunneled pci bridges are siblings of us. Use resume_noirq to reenable
 621  * the tunnels asap. A corresponding pci quirk blocks the downstream bridges
 622  * resume_noirq until we are done.
 623  */
 624 static const struct dev_pm_ops nhi_pm_ops = {
 625         .suspend_noirq = nhi_suspend_noirq,
 626         .resume_noirq = nhi_resume_noirq,
 627         .freeze_noirq = nhi_suspend_noirq, /*
 628                                             * we just disable hotplug, the
 629                                             * pci-tunnels stay alive.
 630                                             */
 631         .thaw_noirq = nhi_resume_noirq,
 632         .restore_noirq = nhi_resume_noirq,
 633 };
 634
 635 static struct pci_device_id nhi_ids[] = {
 636         /*
 637          * We have to specify class, the TB bridges use the same device and
 638          * vendor (sub)id on gen 1 and gen 2 controllers.
 639          */
 640         {
 641                 .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
 642                 .vendor = PCI_VENDOR_ID_INTEL,
 643                 .device = PCI_DEVICE_ID_INTEL_LIGHT_RIDGE,
 644                 .subvendor = 0x2222, .subdevice = 0x1111,
 645         },
 646         {
 647                 .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
 648                 .vendor = PCI_VENDOR_ID_INTEL,
 649                 .device = PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C,
 650                 .subvendor = 0x2222, .subdevice = 0x1111,
 651         },
 652         {
 653                 .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
 654                 .vendor = PCI_VENDOR_ID_INTEL,
 655                 .device = PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI,
 656                 .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID,
 657         },
 658         {
 659                 .class = PCI_CLASS_SYSTEM_OTHER << 8, .class_mask = ~0,
 660                 .vendor = PCI_VENDOR_ID_INTEL,
 661                 .device = PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI,
 662                 .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID,
 663         },
 664         { 0,}
 665 };
 666
 667 MODULE_DEVICE_TABLE(pci, nhi_ids);
 668 MODULE_LICENSE("GPL");
 669
 670 static struct pci_driver nhi_driver = {
 671         .name = "thunderbolt",
 672         .id_table = nhi_ids,
 673         .probe = nhi_probe,
 674         .remove = nhi_remove,
 675         .driver.pm = &nhi_pm_ops,
 676 };
 677
 678 static int __init nhi_init(void)
 679 {
 680         if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc."))
 681                 return -ENOSYS;
 682         return pci_register_driver(&nhi_driver);
 683 }
 684
 685 static void __exit nhi_unload(void)
 686 {
 687         pci_unregister_driver(&nhi_driver);
 688 }
 689
 690 module_init(nhi_init);
 691 module_exit(nhi_unload);