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[];
  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         int ret;
 350
 351         switch (cmd) {
 352         case NOSY_IOC_GET_STATS:
 353                 spin_lock_irq(client_list_lock);
 354                 stats.total_packet_count = client->buffer.total_packet_count;
 355                 stats.lost_packet_count  = client->buffer.lost_packet_count;
 356                 spin_unlock_irq(client_list_lock);
 357
 358                 if (copy_to_user((void __user *) arg, &stats, sizeof stats))
 359                         return -EFAULT;
 360                 else
 361                         return 0;
 362
 363         case NOSY_IOC_START:
 364                 ret = -EBUSY;
 365                 spin_lock_irq(client_list_lock);
 366                 if (list_empty(&client->link)) {
 367                         list_add_tail(&client->link, &client->lynx->client_list);
 368                         ret = 0;
 369                 }
 370                 spin_unlock_irq(client_list_lock);
 371
 372                 return ret;
 373
 374         case NOSY_IOC_STOP:
 375                 spin_lock_irq(client_list_lock);
 376                 list_del_init(&client->link);
 377                 spin_unlock_irq(client_list_lock);
 378
 379                 return 0;
 380
 381         case NOSY_IOC_FILTER:
 382                 spin_lock_irq(client_list_lock);
 383                 client->tcode_mask = arg;
 384                 spin_unlock_irq(client_list_lock);
 385
 386                 return 0;
 387
 388         default:
 389                 return -EINVAL;
 390                 /* Flush buffer, configure filter. */
 391         }
 392 }
 393
 394 static const struct file_operations nosy_ops = {
 395         .owner =                THIS_MODULE,
 396         .read =                 nosy_read,
 397         .unlocked_ioctl =       nosy_ioctl,
 398         .poll =                 nosy_poll,
 399         .open =                 nosy_open,
 400         .release =              nosy_release,
 401 };
 402
 403 #define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */
 404
 405 static void
 406 packet_irq_handler(struct pcilynx *lynx)
 407 {
 408         struct client *client;
 409         u32 tcode_mask, tcode, timestamp;
 410         size_t length;
 411         struct timespec64 ts64;
 412
 413         /* FIXME: Also report rcv_speed. */
 414
 415         length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
 416         tcode  = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
 417
 418         ktime_get_real_ts64(&ts64);
 419         timestamp = ts64.tv_nsec / NSEC_PER_USEC;
 420         lynx->rcv_buffer[0] = (__force __le32)timestamp;
 421
 422         if (length == PHY_PACKET_SIZE)
 423                 tcode_mask = 1 << TCODE_PHY_PACKET;
 424         else
 425                 tcode_mask = 1 << tcode;
 426
 427         spin_lock(&lynx->client_list_lock);
 428
 429         list_for_each_entry(client, &lynx->client_list, link)
 430                 if (client->tcode_mask & tcode_mask)
 431                         packet_buffer_put(&client->buffer,
 432                                           lynx->rcv_buffer, length + 4);
 433
 434         spin_unlock(&lynx->client_list_lock);
 435 }
 436
 437 static void
 438 bus_reset_irq_handler(struct pcilynx *lynx)
 439 {
 440         struct client *client;
 441         struct timespec64 ts64;
 442         u32    timestamp;
 443
 444         ktime_get_real_ts64(&ts64);
 445         timestamp = ts64.tv_nsec / NSEC_PER_USEC;
 446
 447         spin_lock(&lynx->client_list_lock);
 448
 449         list_for_each_entry(client, &lynx->client_list, link)
 450                 packet_buffer_put(&client->buffer, &timestamp, 4);
 451
 452         spin_unlock(&lynx->client_list_lock);
 453 }
 454
 455 static irqreturn_t
 456 irq_handler(int irq, void *device)
 457 {
 458         struct pcilynx *lynx = device;
 459         u32 pci_int_status;
 460
 461         pci_int_status = reg_read(lynx, PCI_INT_STATUS);
 462
 463         if (pci_int_status == ~0)
 464                 /* Card was ejected. */
 465                 return IRQ_NONE;
 466
 467         if ((pci_int_status & PCI_INT_INT_PEND) == 0)
 468                 /* Not our interrupt, bail out quickly. */
 469                 return IRQ_NONE;
 470
 471         if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
 472                 u32 link_int_status;
 473
 474                 link_int_status = reg_read(lynx, LINK_INT_STATUS);
 475                 reg_write(lynx, LINK_INT_STATUS, link_int_status);
 476
 477                 if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
 478                         bus_reset_irq_handler(lynx);
 479         }
 480
 481         /* Clear the PCI_INT_STATUS register only after clearing the
 482          * LINK_INT_STATUS register; otherwise the PCI_INT_P1394 will
 483          * be set again immediately. */
 484
 485         reg_write(lynx, PCI_INT_STATUS, pci_int_status);
 486
 487         if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
 488                 packet_irq_handler(lynx);
 489                 run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
 490         }
 491
 492         return IRQ_HANDLED;
 493 }
 494
 495 static void
 496 remove_card(struct pci_dev *dev)
 497 {
 498         struct pcilynx *lynx = pci_get_drvdata(dev);
 499         struct client *client;
 500
 501         mutex_lock(&card_mutex);
 502         list_del_init(&lynx->link);
 503         misc_deregister(&lynx->misc);
 504         mutex_unlock(&card_mutex);
 505
 506         reg_write(lynx, PCI_INT_ENABLE, 0);
 507         free_irq(lynx->pci_device->irq, lynx);
 508
 509         spin_lock_irq(&lynx->client_list_lock);
 510         list_for_each_entry(client, &lynx->client_list, link)
 511                 wake_up_interruptible(&client->buffer.wait);
 512         spin_unlock_irq(&lynx->client_list_lock);
 513
 514         dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
 515                           lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
 516         dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
 517                           lynx->rcv_pcl, lynx->rcv_pcl_bus);
 518         dma_free_coherent(&lynx->pci_device->dev, PAGE_SIZE, lynx->rcv_buffer,
 519                           lynx->rcv_buffer_bus);
 520
 521         iounmap(lynx->registers);
 522         pci_disable_device(dev);
 523         lynx_put(lynx);
 524 }
 525
 526 #define RCV_BUFFER_SIZE (16 * 1024)
 527
 528 static int
 529 add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 530 {
 531         struct pcilynx *lynx;
 532         u32 p, end;
 533         int ret, i;
 534
 535         if (dma_set_mask(&dev->dev, DMA_BIT_MASK(32))) {
 536                 dev_err(&dev->dev,
 537                     "DMA address limits not supported for PCILynx hardware\n");
 538                 return -ENXIO;
 539         }
 540         if (pci_enable_device(dev)) {
 541                 dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
 542                 return -ENXIO;
 543         }
 544         pci_set_master(dev);
 545
 546         lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
 547         if (lynx == NULL) {
 548                 dev_err(&dev->dev, "Failed to allocate control structure\n");
 549                 ret = -ENOMEM;
 550                 goto fail_disable;
 551         }
 552         lynx->pci_device = dev;
 553         pci_set_drvdata(dev, lynx);
 554
 555         spin_lock_init(&lynx->client_list_lock);
 556         INIT_LIST_HEAD(&lynx->client_list);
 557         kref_init(&lynx->kref);
 558
 559         lynx->registers = ioremap(pci_resource_start(dev, 0),
 560                                           PCILYNX_MAX_REGISTER);
 561         if (lynx->registers == NULL) {
 562                 dev_err(&dev->dev, "Failed to map registers\n");
 563                 ret = -ENOMEM;
 564                 goto fail_deallocate_lynx;
 565         }
 566
 567         lynx->rcv_start_pcl = dma_alloc_coherent(&lynx->pci_device->dev,
 568                                                  sizeof(struct pcl),
 569                                                  &lynx->rcv_start_pcl_bus,
 570                                                  GFP_KERNEL);
 571         lynx->rcv_pcl = dma_alloc_coherent(&lynx->pci_device->dev,
 572                                            sizeof(struct pcl),
 573                                            &lynx->rcv_pcl_bus, GFP_KERNEL);
 574         lynx->rcv_buffer = dma_alloc_coherent(&lynx->pci_device->dev,
 575                                               RCV_BUFFER_SIZE,
 576                                               &lynx->rcv_buffer_bus, GFP_KERNEL);
 577         if (lynx->rcv_start_pcl == NULL ||
 578             lynx->rcv_pcl == NULL ||
 579             lynx->rcv_buffer == NULL) {
 580                 dev_err(&dev->dev, "Failed to allocate receive buffer\n");
 581                 ret = -ENOMEM;
 582                 goto fail_deallocate_buffers;
 583         }
 584         lynx->rcv_start_pcl->next       = cpu_to_le32(lynx->rcv_pcl_bus);
 585         lynx->rcv_pcl->next             = cpu_to_le32(PCL_NEXT_INVALID);
 586         lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
 587
 588         lynx->rcv_pcl->buffer[0].control =
 589                         cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
 590         lynx->rcv_pcl->buffer[0].pointer =
 591                         cpu_to_le32(lynx->rcv_buffer_bus + 4);
 592         p = lynx->rcv_buffer_bus + 2048;
 593         end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
 594         for (i = 1; p < end; i++, p += 2048) {
 595                 lynx->rcv_pcl->buffer[i].control =
 596                         cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
 597                 lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
 598         }
 599         lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
 600
 601         reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
 602         /* Fix buggy cards with autoboot pin not tied low: */
 603         reg_write(lynx, DMA0_CHAN_CTRL, 0);
 604         reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
 605
 606 #if 0
 607         /* now, looking for PHY register set */
 608         if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
 609                 lynx->phyic.reg_1394a = 1;
 610                 PRINT(KERN_INFO, lynx->id,
 611                       "found 1394a conform PHY (using extended register set)");
 612                 lynx->phyic.vendor = get_phy_vendorid(lynx);
 613                 lynx->phyic.product = get_phy_productid(lynx);
 614         } else {
 615                 lynx->phyic.reg_1394a = 0;
 616                 PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
 617         }
 618 #endif
 619
 620         /* Setup the general receive FIFO max size. */
 621         reg_write(lynx, FIFO_SIZES, 255);
 622
 623         reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
 624
 625         reg_write(lynx, LINK_INT_ENABLE,
 626                   LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
 627                   LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
 628                   LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
 629                   LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
 630                   LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
 631
 632         /* Disable the L flag in self ID packets. */
 633         set_phy_reg(lynx, 4, 0);
 634
 635         /* Put this baby into snoop mode */
 636         reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
 637
 638         run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
 639
 640         if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
 641                         driver_name, lynx)) {
 642                 dev_err(&dev->dev,
 643                         "Failed to allocate shared interrupt %d\n", dev->irq);
 644                 ret = -EIO;
 645                 goto fail_deallocate_buffers;
 646         }
 647
 648         lynx->misc.parent = &dev->dev;
 649         lynx->misc.minor = MISC_DYNAMIC_MINOR;
 650         lynx->misc.name = "nosy";
 651         lynx->misc.fops = &nosy_ops;
 652
 653         mutex_lock(&card_mutex);
 654         ret = misc_register(&lynx->misc);
 655         if (ret) {
 656                 dev_err(&dev->dev, "Failed to register misc char device\n");
 657                 mutex_unlock(&card_mutex);
 658                 goto fail_free_irq;
 659         }
 660         list_add_tail(&lynx->link, &card_list);
 661         mutex_unlock(&card_mutex);
 662
 663         dev_info(&dev->dev,
 664                  "Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
 665
 666         return 0;
 667
 668 fail_free_irq:
 669         reg_write(lynx, PCI_INT_ENABLE, 0);
 670         free_irq(lynx->pci_device->irq, lynx);
 671
 672 fail_deallocate_buffers:
 673         if (lynx->rcv_start_pcl)
 674                 dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
 675                                   lynx->rcv_start_pcl,
 676                                   lynx->rcv_start_pcl_bus);
 677         if (lynx->rcv_pcl)
 678                 dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
 679                                   lynx->rcv_pcl, lynx->rcv_pcl_bus);
 680         if (lynx->rcv_buffer)
 681                 dma_free_coherent(&lynx->pci_device->dev, PAGE_SIZE,
 682                                   lynx->rcv_buffer, lynx->rcv_buffer_bus);
 683         iounmap(lynx->registers);
 684
 685 fail_deallocate_lynx:
 686         kfree(lynx);
 687
 688 fail_disable:
 689         pci_disable_device(dev);
 690
 691         return ret;
 692 }
 693
 694 static struct pci_device_id pci_table[] = {
 695         {
 696                 .vendor =    PCI_VENDOR_ID_TI,
 697                 .device =    PCI_DEVICE_ID_TI_PCILYNX,
 698                 .subvendor = PCI_ANY_ID,
 699                 .subdevice = PCI_ANY_ID,
 700         },
 701         { }     /* Terminating entry */
 702 };
 703
 704 MODULE_DEVICE_TABLE(pci, pci_table);
 705
 706 static struct pci_driver lynx_pci_driver = {
 707         .name =         driver_name,
 708         .id_table =     pci_table,
 709         .probe =        add_card,
 710         .remove =       remove_card,
 711 };
 712
 713 module_pci_driver(lynx_pci_driver);
 714
 715 MODULE_AUTHOR("Kristian Hoegsberg");
 716 MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
 717 MODULE_LICENSE("GPL");