drivers/firewire/nosy.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * nosy - Snoop mode driver for TI PCILynx 1394 controllers
   4  * Copyright (C) 2002-2007 Kristian Høgsberg
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/errno.h>
   9 #include <linux/fs.h>
  10 #include <linux/init.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/io.h>
  13 #include <linux/kernel.h>
  14 #include <linux/kref.h>
  15 #include <linux/miscdevice.h>
  16 #include <linux/module.h>
  17 #include <linux/mutex.h>
  18 #include <linux/pci.h>
  19 #include <linux/poll.h>
  20 #include <linux/sched.h> /* required for linux/wait.h */
  21 #include <linux/slab.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/time64.h>
  24 #include <linux/timex.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/wait.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/atomic.h>
  29 #include <asm/byteorder.h>
  30
  31 #include "nosy.h"
  32 #include "nosy-user.h"
  33
  34 #define TCODE_PHY_PACKET                0x10
  35 #define PCI_DEVICE_ID_TI_PCILYNX        0x8000
  36
  37 static char driver_name[] = KBUILD_MODNAME;
  38
  39 /* this is the physical layout of a PCL, its size is 128 bytes */
  40 struct pcl {
  41         __le32 next;
  42         __le32 async_error_next;
  43         u32 user_data;
  44         __le32 pcl_status;
  45         __le32 remaining_transfer_count;
  46         __le32 next_data_buffer;
  47         struct {
  48                 __le32 control;
  49                 __le32 pointer;
  50         } buffer[13];
  51 };
  52
  53 struct packet {
  54         unsigned int length;
  55         char data[0];
  56 };
  57
  58 struct packet_buffer {
  59         char *data;
  60         size_t capacity;
  61         long total_packet_count, lost_packet_count;
  62         atomic_t size;
  63         struct packet *head, *tail;
  64         wait_queue_head_t wait;
  65 };
  66
  67 struct pcilynx {
  68         struct pci_dev *pci_device;
  69         __iomem char *registers;
  70
  71         struct pcl *rcv_start_pcl, *rcv_pcl;
  72         __le32 *rcv_buffer;
  73
  74         dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
  75
  76         spinlock_t client_list_lock;
  77         struct list_head client_list;
  78
  79         struct miscdevice misc;
  80         struct list_head link;
  81         struct kref kref;
  82 };
  83
  84 static inline struct pcilynx *
  85 lynx_get(struct pcilynx *lynx)
  86 {
  87         kref_get(&lynx->kref);
  88
  89         return lynx;
  90 }
  91
  92 static void
  93 lynx_release(struct kref *kref)
  94 {
  95         kfree(container_of(kref, struct pcilynx, kref));
  96 }
  97
  98 static inline void
  99 lynx_put(struct pcilynx *lynx)
 100 {
 101         kref_put(&lynx->kref, lynx_release);
 102 }
 103
 104 struct client {
 105         struct pcilynx *lynx;
 106         u32 tcode_mask;
 107         struct packet_buffer buffer;
 108         struct list_head link;
 109 };
 110
 111 static DEFINE_MUTEX(card_mutex);
 112 static LIST_HEAD(card_list);
 113
 114 static int
 115 packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
 116 {
 117         buffer->data = kmalloc(capacity, GFP_KERNEL);
 118         if (buffer->data == NULL)
 119                 return -ENOMEM;
 120         buffer->head = (struct packet *) buffer->data;
 121         buffer->tail = (struct packet *) buffer->data;
 122         buffer->capacity = capacity;
 123         buffer->lost_packet_count = 0;
 124         atomic_set(&buffer->size, 0);
 125         init_waitqueue_head(&buffer->wait);
 126
 127         return 0;
 128 }
 129
 130 static void
 131 packet_buffer_destroy(struct packet_buffer *buffer)
 132 {
 133         kfree(buffer->data);
 134 }
 135
 136 static int
 137 packet_buffer_get(struct client *client, char __user *data, size_t user_length)
 138 {
 139         struct packet_buffer *buffer = &client->buffer;
 140         size_t length;
 141         char *end;
 142
 143         if (wait_event_interruptible(buffer->wait,
 144                                      atomic_read(&buffer->size) > 0) ||
 145                                      list_empty(&client->lynx->link))
 146                 return -ERESTARTSYS;
 147
 148         if (atomic_read(&buffer->size) == 0)
 149                 return -ENODEV;
 150
 151         /* FIXME: Check length <= user_length. */
 152
 153         end = buffer->data + buffer->capacity;
 154         length = buffer->head->length;
 155
 156         if (&buffer->head->data[length] < end) {
 157                 if (copy_to_user(data, buffer->head->data, length))
 158                         return -EFAULT;
 159                 buffer->head = (struct packet *) &buffer->head->data[length];
 160         } else {
 161                 size_t split = end - buffer->head->data;
 162
 163                 if (copy_to_user(data, buffer->head->data, split))
 164                         return -EFAULT;
 165                 if (copy_to_user(data + split, buffer->data, length - split))
 166                         return -EFAULT;
 167                 buffer->head = (struct packet *) &buffer->data[length - split];
 168         }
 169
 170         /*
 171          * Decrease buffer->size as the last thing, since this is what
 172          * keeps the interrupt from overwriting the packet we are
 173          * retrieving from the buffer.
 174          */
 175         atomic_sub(sizeof(struct packet) + length, &buffer->size);
 176
 177         return length;
 178 }
 179
 180 static void
 181 packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
 182 {
 183         char *end;
 184
 185         buffer->total_packet_count++;
 186
 187         if (buffer->capacity <
 188             atomic_read(&buffer->size) + sizeof(struct packet) + length) {
 189                 buffer->lost_packet_count++;
 190                 return;
 191         }
 192
 193         end = buffer->data + buffer->capacity;
 194         buffer->tail->length = length;
 195
 196         if (&buffer->tail->data[length] < end) {
 197                 memcpy(buffer->tail->data, data, length);
 198                 buffer->tail = (struct packet *) &buffer->tail->data[length];
 199         } else {
 200                 size_t split = end - buffer->tail->data;
 201
 202                 memcpy(buffer->tail->data, data, split);
 203                 memcpy(buffer->data, data + split, length - split);
 204                 buffer->tail = (struct packet *) &buffer->data[length - split];
 205         }
 206
 207         /* Finally, adjust buffer size and wake up userspace reader. */
 208
 209         atomic_add(sizeof(struct packet) + length, &buffer->size);
 210         wake_up_interruptible(&buffer->wait);
 211 }
 212
 213 static inline void
 214 reg_write(struct pcilynx *lynx, int offset, u32 data)
 215 {
 216         writel(data, lynx->registers + offset);
 217 }
 218
 219 static inline u32
 220 reg_read(struct pcilynx *lynx, int offset)
 221 {
 222         return readl(lynx->registers + offset);
 223 }
 224
 225 static inline void
 226 reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
 227 {
 228         reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
 229 }
 230
 231 /*
 232  * Maybe the pcl programs could be set up to just append data instead
 233  * of using a whole packet.
 234  */
 235 static inline void
 236 run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
 237                            int dmachan)
 238 {
 239         reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
 240         reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
 241                   DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
 242 }
 243
 244 static int
 245 set_phy_reg(struct pcilynx *lynx, int addr, int val)
 246 {
 247         if (addr > 15) {
 248                 dev_err(&lynx->pci_device->dev,
 249                         "PHY register address %d out of range\n", addr);
 250                 return -1;
 251         }
 252         if (val > 0xff) {
 253                 dev_err(&lynx->pci_device->dev,
 254                         "PHY register value %d out of range\n", val);
 255                 return -1;
 256         }
 257         reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
 258                   LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));
 259
 260         return 0;
 261 }
 262
 263 static int
 264 nosy_open(struct inode *inode, struct file *file)
 265 {
 266         int minor = iminor(inode);
 267         struct client *client;
 268         struct pcilynx *tmp, *lynx = NULL;
 269
 270         mutex_lock(&card_mutex);
 271         list_for_each_entry(tmp, &card_list, link)
 272                 if (tmp->misc.minor == minor) {
 273                         lynx = lynx_get(tmp);
 274                         break;
 275                 }
 276         mutex_unlock(&card_mutex);
 277         if (lynx == NULL)
 278                 return -ENODEV;
 279
 280         client = kmalloc(sizeof *client, GFP_KERNEL);
 281         if (client == NULL)
 282                 goto fail;
 283
 284         client->tcode_mask = ~0;
 285         client->lynx = lynx;
 286         INIT_LIST_HEAD(&client->link);
 287
 288         if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
 289                 goto fail;
 290
 291         file->private_data = client;
 292
 293         return stream_open(inode, file);
 294 fail:
 295         kfree(client);
 296         lynx_put(lynx);
 297
 298         return -ENOMEM;
 299 }
 300
 301 static int
 302 nosy_release(struct inode *inode, struct file *file)
 303 {
 304         struct client *client = file->private_data;
 305         struct pcilynx *lynx = client->lynx;
 306
 307         spin_lock_irq(&lynx->client_list_lock);
 308         list_del_init(&client->link);
 309         spin_unlock_irq(&lynx->client_list_lock);
 310
 311         packet_buffer_destroy(&client->buffer);
 312         kfree(client);
 313         lynx_put(lynx);
 314
 315         return 0;
 316 }
 317
 318 static __poll_t
 319 nosy_poll(struct file *file, poll_table *pt)
 320 {
 321         struct client *client = file->private_data;
 322         __poll_t ret = 0;
 323
 324         poll_wait(file, &client->buffer.wait, pt);
 325
 326         if (atomic_read(&client->buffer.size) > 0)
 327                 ret = EPOLLIN | EPOLLRDNORM;
 328
 329         if (list_empty(&client->lynx->link))
 330                 ret |= EPOLLHUP;
 331
 332         return ret;
 333 }
 334
 335 static ssize_t
 336 nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
 337 {
 338         struct client *client = file->private_data;
 339
 340         return packet_buffer_get(client, buffer, count);
 341 }
 342
 343 static long
 344 nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 345 {
 346         struct client *client = file->private_data;
 347         spinlock_t *client_list_lock = &client->lynx->client_list_lock;
 348         struct nosy_stats stats;
 349
 350         switch (cmd) {
 351         case NOSY_IOC_GET_STATS:
 352                 spin_lock_irq(client_list_lock);
 353                 stats.total_packet_count = client->buffer.total_packet_count;
 354                 stats.lost_packet_count  = client->buffer.lost_packet_count;
 355                 spin_unlock_irq(client_list_lock);
 356
 357                 if (copy_to_user((void __user *) arg, &stats, sizeof stats))
 358                         return -EFAULT;
 359                 else
 360                         return 0;
 361
 362         case NOSY_IOC_START:
 363                 spin_lock_irq(client_list_lock);
 364                 list_add_tail(&client->link, &client->lynx->client_list);
 365                 spin_unlock_irq(client_list_lock);
 366
 367                 return 0;
 368
 369         case NOSY_IOC_STOP:
 370                 spin_lock_irq(client_list_lock);
 371                 list_del_init(&client->link);
 372                 spin_unlock_irq(client_list_lock);
 373
 374                 return 0;
 375
 376         case NOSY_IOC_FILTER:
 377                 spin_lock_irq(client_list_lock);
 378                 client->tcode_mask = arg;
 379                 spin_unlock_irq(client_list_lock);
 380
 381                 return 0;
 382
 383         default:
 384                 return -EINVAL;
 385                 /* Flush buffer, configure filter. */
 386         }
 387 }
 388
 389 static const struct file_operations nosy_ops = {
 390         .owner =                THIS_MODULE,
 391         .read =                 nosy_read,
 392         .unlocked_ioctl =       nosy_ioctl,
 393         .poll =                 nosy_poll,
 394         .open =                 nosy_open,
 395         .release =              nosy_release,
 396 };
 397
 398 #define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */
 399
 400 static void
 401 packet_irq_handler(struct pcilynx *lynx)
 402 {
 403         struct client *client;
 404         u32 tcode_mask, tcode, timestamp;
 405         size_t length;
 406         struct timespec64 ts64;
 407
 408         /* FIXME: Also report rcv_speed. */
 409
 410         length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
 411         tcode  = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
 412
 413         ktime_get_real_ts64(&ts64);
 414         timestamp = ts64.tv_nsec / NSEC_PER_USEC;
 415         lynx->rcv_buffer[0] = (__force __le32)timestamp;
 416
 417         if (length == PHY_PACKET_SIZE)
 418                 tcode_mask = 1 << TCODE_PHY_PACKET;
 419         else
 420                 tcode_mask = 1 << tcode;
 421
 422         spin_lock(&lynx->client_list_lock);
 423
 424         list_for_each_entry(client, &lynx->client_list, link)
 425                 if (client->tcode_mask & tcode_mask)
 426                         packet_buffer_put(&client->buffer,
 427                                           lynx->rcv_buffer, length + 4);
 428
 429         spin_unlock(&lynx->client_list_lock);
 430 }
 431
 432 static void
 433 bus_reset_irq_handler(struct pcilynx *lynx)
 434 {
 435         struct client *client;
 436         struct timespec64 ts64;
 437         u32    timestamp;
 438
 439         ktime_get_real_ts64(&ts64);
 440         timestamp = ts64.tv_nsec / NSEC_PER_USEC;
 441
 442         spin_lock(&lynx->client_list_lock);
 443
 444         list_for_each_entry(client, &lynx->client_list, link)
 445                 packet_buffer_put(&client->buffer, &timestamp, 4);
 446
 447         spin_unlock(&lynx->client_list_lock);
 448 }
 449
 450 static irqreturn_t
 451 irq_handler(int irq, void *device)
 452 {
 453         struct pcilynx *lynx = device;
 454         u32 pci_int_status;
 455
 456         pci_int_status = reg_read(lynx, PCI_INT_STATUS);
 457
 458         if (pci_int_status == ~0)
 459                 /* Card was ejected. */
 460                 return IRQ_NONE;
 461
 462         if ((pci_int_status & PCI_INT_INT_PEND) == 0)
 463                 /* Not our interrupt, bail out quickly. */
 464                 return IRQ_NONE;
 465
 466         if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
 467                 u32 link_int_status;
 468
 469                 link_int_status = reg_read(lynx, LINK_INT_STATUS);
 470                 reg_write(lynx, LINK_INT_STATUS, link_int_status);
 471
 472                 if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
 473                         bus_reset_irq_handler(lynx);
 474         }
 475
 476         /* Clear the PCI_INT_STATUS register only after clearing the
 477          * LINK_INT_STATUS register; otherwise the PCI_INT_P1394 will
 478          * be set again immediately. */
 479
 480         reg_write(lynx, PCI_INT_STATUS, pci_int_status);
 481
 482         if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
 483                 packet_irq_handler(lynx);
 484                 run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
 485         }
 486
 487         return IRQ_HANDLED;
 488 }
 489
 490 static void
 491 remove_card(struct pci_dev *dev)
 492 {
 493         struct pcilynx *lynx = pci_get_drvdata(dev);
 494         struct client *client;
 495
 496         mutex_lock(&card_mutex);
 497         list_del_init(&lynx->link);
 498         misc_deregister(&lynx->misc);
 499         mutex_unlock(&card_mutex);
 500
 501         reg_write(lynx, PCI_INT_ENABLE, 0);
 502         free_irq(lynx->pci_device->irq, lynx);
 503
 504         spin_lock_irq(&lynx->client_list_lock);
 505         list_for_each_entry(client, &lynx->client_list, link)
 506                 wake_up_interruptible(&client->buffer.wait);
 507         spin_unlock_irq(&lynx->client_list_lock);
 508
 509         pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 510                             lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
 511         pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 512                             lynx->rcv_pcl, lynx->rcv_pcl_bus);
 513         pci_free_consistent(lynx->pci_device, PAGE_SIZE,
 514                             lynx->rcv_buffer, lynx->rcv_buffer_bus);
 515
 516         iounmap(lynx->registers);
 517         pci_disable_device(dev);
 518         lynx_put(lynx);
 519 }
 520
 521 #define RCV_BUFFER_SIZE (16 * 1024)
 522
 523 static int
 524 add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 525 {
 526         struct pcilynx *lynx;
 527         u32 p, end;
 528         int ret, i;
 529
 530         if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
 531                 dev_err(&dev->dev,
 532                     "DMA address limits not supported for PCILynx hardware\n");
 533                 return -ENXIO;
 534         }
 535         if (pci_enable_device(dev)) {
 536                 dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
 537                 return -ENXIO;
 538         }
 539         pci_set_master(dev);
 540
 541         lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
 542         if (lynx == NULL) {
 543                 dev_err(&dev->dev, "Failed to allocate control structure\n");
 544                 ret = -ENOMEM;
 545                 goto fail_disable;
 546         }
 547         lynx->pci_device = dev;
 548         pci_set_drvdata(dev, lynx);
 549
 550         spin_lock_init(&lynx->client_list_lock);
 551         INIT_LIST_HEAD(&lynx->client_list);
 552         kref_init(&lynx->kref);
 553
 554         lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
 555                                           PCILYNX_MAX_REGISTER);
 556         if (lynx->registers == NULL) {
 557                 dev_err(&dev->dev, "Failed to map registers\n");
 558                 ret = -ENOMEM;
 559                 goto fail_deallocate_lynx;
 560         }
 561
 562         lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
 563                                 sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
 564         lynx->rcv_pcl = pci_alloc_consistent(lynx->pci_device,
 565                                 sizeof(struct pcl), &lynx->rcv_pcl_bus);
 566         lynx->rcv_buffer = pci_alloc_consistent(lynx->pci_device,
 567                                 RCV_BUFFER_SIZE, &lynx->rcv_buffer_bus);
 568         if (lynx->rcv_start_pcl == NULL ||
 569             lynx->rcv_pcl == NULL ||
 570             lynx->rcv_buffer == NULL) {
 571                 dev_err(&dev->dev, "Failed to allocate receive buffer\n");
 572                 ret = -ENOMEM;
 573                 goto fail_deallocate_buffers;
 574         }
 575         lynx->rcv_start_pcl->next       = cpu_to_le32(lynx->rcv_pcl_bus);
 576         lynx->rcv_pcl->next             = cpu_to_le32(PCL_NEXT_INVALID);
 577         lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
 578
 579         lynx->rcv_pcl->buffer[0].control =
 580                         cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
 581         lynx->rcv_pcl->buffer[0].pointer =
 582                         cpu_to_le32(lynx->rcv_buffer_bus + 4);
 583         p = lynx->rcv_buffer_bus + 2048;
 584         end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
 585         for (i = 1; p < end; i++, p += 2048) {
 586                 lynx->rcv_pcl->buffer[i].control =
 587                         cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
 588                 lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
 589         }
 590         lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
 591
 592         reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
 593         /* Fix buggy cards with autoboot pin not tied low: */
 594         reg_write(lynx, DMA0_CHAN_CTRL, 0);
 595         reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
 596
 597 #if 0
 598         /* now, looking for PHY register set */
 599         if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
 600                 lynx->phyic.reg_1394a = 1;
 601                 PRINT(KERN_INFO, lynx->id,
 602                       "found 1394a conform PHY (using extended register set)");
 603                 lynx->phyic.vendor = get_phy_vendorid(lynx);
 604                 lynx->phyic.product = get_phy_productid(lynx);
 605         } else {
 606                 lynx->phyic.reg_1394a = 0;
 607                 PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
 608         }
 609 #endif
 610
 611         /* Setup the general receive FIFO max size. */
 612         reg_write(lynx, FIFO_SIZES, 255);
 613
 614         reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
 615
 616         reg_write(lynx, LINK_INT_ENABLE,
 617                   LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
 618                   LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
 619                   LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
 620                   LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
 621                   LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
 622
 623         /* Disable the L flag in self ID packets. */
 624         set_phy_reg(lynx, 4, 0);
 625
 626         /* Put this baby into snoop mode */
 627         reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
 628
 629         run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
 630
 631         if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
 632                         driver_name, lynx)) {
 633                 dev_err(&dev->dev,
 634                         "Failed to allocate shared interrupt %d\n", dev->irq);
 635                 ret = -EIO;
 636                 goto fail_deallocate_buffers;
 637         }
 638
 639         lynx->misc.parent = &dev->dev;
 640         lynx->misc.minor = MISC_DYNAMIC_MINOR;
 641         lynx->misc.name = "nosy";
 642         lynx->misc.fops = &nosy_ops;
 643
 644         mutex_lock(&card_mutex);
 645         ret = misc_register(&lynx->misc);
 646         if (ret) {
 647                 dev_err(&dev->dev, "Failed to register misc char device\n");
 648                 mutex_unlock(&card_mutex);
 649                 goto fail_free_irq;
 650         }
 651         list_add_tail(&lynx->link, &card_list);
 652         mutex_unlock(&card_mutex);
 653
 654         dev_info(&dev->dev,
 655                  "Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
 656
 657         return 0;
 658
 659 fail_free_irq:
 660         reg_write(lynx, PCI_INT_ENABLE, 0);
 661         free_irq(lynx->pci_device->irq, lynx);
 662
 663 fail_deallocate_buffers:
 664         if (lynx->rcv_start_pcl)
 665                 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 666                                 lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
 667         if (lynx->rcv_pcl)
 668                 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 669                                 lynx->rcv_pcl, lynx->rcv_pcl_bus);
 670         if (lynx->rcv_buffer)
 671                 pci_free_consistent(lynx->pci_device, PAGE_SIZE,
 672                                 lynx->rcv_buffer, lynx->rcv_buffer_bus);
 673         iounmap(lynx->registers);
 674
 675 fail_deallocate_lynx:
 676         kfree(lynx);
 677
 678 fail_disable:
 679         pci_disable_device(dev);
 680
 681         return ret;
 682 }
 683
 684 static struct pci_device_id pci_table[] = {
 685         {
 686                 .vendor =    PCI_VENDOR_ID_TI,
 687                 .device =    PCI_DEVICE_ID_TI_PCILYNX,
 688                 .subvendor = PCI_ANY_ID,
 689                 .subdevice = PCI_ANY_ID,
 690         },
 691         { }     /* Terminating entry */
 692 };
 693
 694 MODULE_DEVICE_TABLE(pci, pci_table);
 695
 696 static struct pci_driver lynx_pci_driver = {
 697         .name =         driver_name,
 698         .id_table =     pci_table,
 699         .probe =        add_card,
 700         .remove =       remove_card,
 701 };
 702
 703 module_pci_driver(lynx_pci_driver);
 704
 705 MODULE_AUTHOR("Kristian Hoegsberg");
 706 MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
 707 MODULE_LICENSE("GPL");