drivers/firewire/nosy.c

   1 /*
   2  * nosy - Snoop mode driver for TI PCILynx 1394 controllers
   3  * Copyright (C) 2002-2007 Kristian Høgsberg
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/errno.h>
  22 #include <linux/fs.h>
  23 #include <linux/init.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/io.h>
  26 #include <linux/kernel.h>
  27 #include <linux/kref.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/module.h>
  30 #include <linux/mutex.h>
  31 #include <linux/pci.h>
  32 #include <linux/poll.h>
  33 #include <linux/sched.h> /* required for linux/wait.h */
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/time64.h>
  37 #include <linux/timex.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/wait.h>
  40 #include <linux/dma-mapping.h>
  41 #include <linux/atomic.h>
  42 #include <asm/byteorder.h>
  43
  44 #include "nosy.h"
  45 #include "nosy-user.h"
  46
  47 #define TCODE_PHY_PACKET                0x10
  48 #define PCI_DEVICE_ID_TI_PCILYNX        0x8000
  49
  50 static char driver_name[] = KBUILD_MODNAME;
  51
  52 /* this is the physical layout of a PCL, its size is 128 bytes */
  53 struct pcl {
  54         __le32 next;
  55         __le32 async_error_next;
  56         u32 user_data;
  57         __le32 pcl_status;
  58         __le32 remaining_transfer_count;
  59         __le32 next_data_buffer;
  60         struct {
  61                 __le32 control;
  62                 __le32 pointer;
  63         } buffer[13];
  64 };
  65
  66 struct packet {
  67         unsigned int length;
  68         char data[0];
  69 };
  70
  71 struct packet_buffer {
  72         char *data;
  73         size_t capacity;
  74         long total_packet_count, lost_packet_count;
  75         atomic_t size;
  76         struct packet *head, *tail;
  77         wait_queue_head_t wait;
  78 };
  79
  80 struct pcilynx {
  81         struct pci_dev *pci_device;
  82         __iomem char *registers;
  83
  84         struct pcl *rcv_start_pcl, *rcv_pcl;
  85         __le32 *rcv_buffer;
  86
  87         dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
  88
  89         spinlock_t client_list_lock;
  90         struct list_head client_list;
  91
  92         struct miscdevice misc;
  93         struct list_head link;
  94         struct kref kref;
  95 };
  96
  97 static inline struct pcilynx *
  98 lynx_get(struct pcilynx *lynx)
  99 {
 100         kref_get(&lynx->kref);
 101
 102         return lynx;
 103 }
 104
 105 static void
 106 lynx_release(struct kref *kref)
 107 {
 108         kfree(container_of(kref, struct pcilynx, kref));
 109 }
 110
 111 static inline void
 112 lynx_put(struct pcilynx *lynx)
 113 {
 114         kref_put(&lynx->kref, lynx_release);
 115 }
 116
 117 struct client {
 118         struct pcilynx *lynx;
 119         u32 tcode_mask;
 120         struct packet_buffer buffer;
 121         struct list_head link;
 122 };
 123
 124 static DEFINE_MUTEX(card_mutex);
 125 static LIST_HEAD(card_list);
 126
 127 static int
 128 packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
 129 {
 130         buffer->data = kmalloc(capacity, GFP_KERNEL);
 131         if (buffer->data == NULL)
 132                 return -ENOMEM;
 133         buffer->head = (struct packet *) buffer->data;
 134         buffer->tail = (struct packet *) buffer->data;
 135         buffer->capacity = capacity;
 136         buffer->lost_packet_count = 0;
 137         atomic_set(&buffer->size, 0);
 138         init_waitqueue_head(&buffer->wait);
 139
 140         return 0;
 141 }
 142
 143 static void
 144 packet_buffer_destroy(struct packet_buffer *buffer)
 145 {
 146         kfree(buffer->data);
 147 }
 148
 149 static int
 150 packet_buffer_get(struct client *client, char __user *data, size_t user_length)
 151 {
 152         struct packet_buffer *buffer = &client->buffer;
 153         size_t length;
 154         char *end;
 155
 156         if (wait_event_interruptible(buffer->wait,
 157                                      atomic_read(&buffer->size) > 0) ||
 158                                      list_empty(&client->lynx->link))
 159                 return -ERESTARTSYS;
 160
 161         if (atomic_read(&buffer->size) == 0)
 162                 return -ENODEV;
 163
 164         /* FIXME: Check length <= user_length. */
 165
 166         end = buffer->data + buffer->capacity;
 167         length = buffer->head->length;
 168
 169         if (&buffer->head->data[length] < end) {
 170                 if (copy_to_user(data, buffer->head->data, length))
 171                         return -EFAULT;
 172                 buffer->head = (struct packet *) &buffer->head->data[length];
 173         } else {
 174                 size_t split = end - buffer->head->data;
 175
 176                 if (copy_to_user(data, buffer->head->data, split))
 177                         return -EFAULT;
 178                 if (copy_to_user(data + split, buffer->data, length - split))
 179                         return -EFAULT;
 180                 buffer->head = (struct packet *) &buffer->data[length - split];
 181         }
 182
 183         /*
 184          * Decrease buffer->size as the last thing, since this is what
 185          * keeps the interrupt from overwriting the packet we are
 186          * retrieving from the buffer.
 187          */
 188         atomic_sub(sizeof(struct packet) + length, &buffer->size);
 189
 190         return length;
 191 }
 192
 193 static void
 194 packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
 195 {
 196         char *end;
 197
 198         buffer->total_packet_count++;
 199
 200         if (buffer->capacity <
 201             atomic_read(&buffer->size) + sizeof(struct packet) + length) {
 202                 buffer->lost_packet_count++;
 203                 return;
 204         }
 205
 206         end = buffer->data + buffer->capacity;
 207         buffer->tail->length = length;
 208
 209         if (&buffer->tail->data[length] < end) {
 210                 memcpy(buffer->tail->data, data, length);
 211                 buffer->tail = (struct packet *) &buffer->tail->data[length];
 212         } else {
 213                 size_t split = end - buffer->tail->data;
 214
 215                 memcpy(buffer->tail->data, data, split);
 216                 memcpy(buffer->data, data + split, length - split);
 217                 buffer->tail = (struct packet *) &buffer->data[length - split];
 218         }
 219
 220         /* Finally, adjust buffer size and wake up userspace reader. */
 221
 222         atomic_add(sizeof(struct packet) + length, &buffer->size);
 223         wake_up_interruptible(&buffer->wait);
 224 }
 225
 226 static inline void
 227 reg_write(struct pcilynx *lynx, int offset, u32 data)
 228 {
 229         writel(data, lynx->registers + offset);
 230 }
 231
 232 static inline u32
 233 reg_read(struct pcilynx *lynx, int offset)
 234 {
 235         return readl(lynx->registers + offset);
 236 }
 237
 238 static inline void
 239 reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
 240 {
 241         reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
 242 }
 243
 244 /*
 245  * Maybe the pcl programs could be set up to just append data instead
 246  * of using a whole packet.
 247  */
 248 static inline void
 249 run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
 250                            int dmachan)
 251 {
 252         reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
 253         reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
 254                   DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
 255 }
 256
 257 static int
 258 set_phy_reg(struct pcilynx *lynx, int addr, int val)
 259 {
 260         if (addr > 15) {
 261                 dev_err(&lynx->pci_device->dev,
 262                         "PHY register address %d out of range\n", addr);
 263                 return -1;
 264         }
 265         if (val > 0xff) {
 266                 dev_err(&lynx->pci_device->dev,
 267                         "PHY register value %d out of range\n", val);
 268                 return -1;
 269         }
 270         reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
 271                   LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));
 272
 273         return 0;
 274 }
 275
 276 static int
 277 nosy_open(struct inode *inode, struct file *file)
 278 {
 279         int minor = iminor(inode);
 280         struct client *client;
 281         struct pcilynx *tmp, *lynx = NULL;
 282
 283         mutex_lock(&card_mutex);
 284         list_for_each_entry(tmp, &card_list, link)
 285                 if (tmp->misc.minor == minor) {
 286                         lynx = lynx_get(tmp);
 287                         break;
 288                 }
 289         mutex_unlock(&card_mutex);
 290         if (lynx == NULL)
 291                 return -ENODEV;
 292
 293         client = kmalloc(sizeof *client, GFP_KERNEL);
 294         if (client == NULL)
 295                 goto fail;
 296
 297         client->tcode_mask = ~0;
 298         client->lynx = lynx;
 299         INIT_LIST_HEAD(&client->link);
 300
 301         if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
 302                 goto fail;
 303
 304         file->private_data = client;
 305
 306         return nonseekable_open(inode, file);
 307 fail:
 308         kfree(client);
 309         lynx_put(lynx);
 310
 311         return -ENOMEM;
 312 }
 313
 314 static int
 315 nosy_release(struct inode *inode, struct file *file)
 316 {
 317         struct client *client = file->private_data;
 318         struct pcilynx *lynx = client->lynx;
 319
 320         spin_lock_irq(&lynx->client_list_lock);
 321         list_del_init(&client->link);
 322         spin_unlock_irq(&lynx->client_list_lock);
 323
 324         packet_buffer_destroy(&client->buffer);
 325         kfree(client);
 326         lynx_put(lynx);
 327
 328         return 0;
 329 }
 330
 331 static unsigned int
 332 nosy_poll(struct file *file, poll_table *pt)
 333 {
 334         struct client *client = file->private_data;
 335         unsigned int ret = 0;
 336
 337         poll_wait(file, &client->buffer.wait, pt);
 338
 339         if (atomic_read(&client->buffer.size) > 0)
 340                 ret = POLLIN | POLLRDNORM;
 341
 342         if (list_empty(&client->lynx->link))
 343                 ret |= POLLHUP;
 344
 345         return ret;
 346 }
 347
 348 static ssize_t
 349 nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
 350 {
 351         struct client *client = file->private_data;
 352
 353         return packet_buffer_get(client, buffer, count);
 354 }
 355
 356 static long
 357 nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 358 {
 359         struct client *client = file->private_data;
 360         spinlock_t *client_list_lock = &client->lynx->client_list_lock;
 361         struct nosy_stats stats;
 362
 363         switch (cmd) {
 364         case NOSY_IOC_GET_STATS:
 365                 spin_lock_irq(client_list_lock);
 366                 stats.total_packet_count = client->buffer.total_packet_count;
 367                 stats.lost_packet_count  = client->buffer.lost_packet_count;
 368                 spin_unlock_irq(client_list_lock);
 369
 370                 if (copy_to_user((void __user *) arg, &stats, sizeof stats))
 371                         return -EFAULT;
 372                 else
 373                         return 0;
 374
 375         case NOSY_IOC_START:
 376                 spin_lock_irq(client_list_lock);
 377                 list_add_tail(&client->link, &client->lynx->client_list);
 378                 spin_unlock_irq(client_list_lock);
 379
 380                 return 0;
 381
 382         case NOSY_IOC_STOP:
 383                 spin_lock_irq(client_list_lock);
 384                 list_del_init(&client->link);
 385                 spin_unlock_irq(client_list_lock);
 386
 387                 return 0;
 388
 389         case NOSY_IOC_FILTER:
 390                 spin_lock_irq(client_list_lock);
 391                 client->tcode_mask = arg;
 392                 spin_unlock_irq(client_list_lock);
 393
 394                 return 0;
 395
 396         default:
 397                 return -EINVAL;
 398                 /* Flush buffer, configure filter. */
 399         }
 400 }
 401
 402 static const struct file_operations nosy_ops = {
 403         .owner =                THIS_MODULE,
 404         .read =                 nosy_read,
 405         .unlocked_ioctl =       nosy_ioctl,
 406         .poll =                 nosy_poll,
 407         .open =                 nosy_open,
 408         .release =              nosy_release,
 409 };
 410
 411 #define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */
 412
 413 static void
 414 packet_irq_handler(struct pcilynx *lynx)
 415 {
 416         struct client *client;
 417         u32 tcode_mask, tcode, timestamp;
 418         size_t length;
 419         struct timespec64 ts64;
 420
 421         /* FIXME: Also report rcv_speed. */
 422
 423         length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
 424         tcode  = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
 425
 426         ktime_get_real_ts64(&ts64);
 427         timestamp = ts64.tv_nsec / NSEC_PER_USEC;
 428         lynx->rcv_buffer[0] = (__force __le32)timestamp;
 429
 430         if (length == PHY_PACKET_SIZE)
 431                 tcode_mask = 1 << TCODE_PHY_PACKET;
 432         else
 433                 tcode_mask = 1 << tcode;
 434
 435         spin_lock(&lynx->client_list_lock);
 436
 437         list_for_each_entry(client, &lynx->client_list, link)
 438                 if (client->tcode_mask & tcode_mask)
 439                         packet_buffer_put(&client->buffer,
 440                                           lynx->rcv_buffer, length + 4);
 441
 442         spin_unlock(&lynx->client_list_lock);
 443 }
 444
 445 static void
 446 bus_reset_irq_handler(struct pcilynx *lynx)
 447 {
 448         struct client *client;
 449         struct timeval tv;
 450
 451         do_gettimeofday(&tv);
 452
 453         spin_lock(&lynx->client_list_lock);
 454
 455         list_for_each_entry(client, &lynx->client_list, link)
 456                 packet_buffer_put(&client->buffer, &tv.tv_usec, 4);
 457
 458         spin_unlock(&lynx->client_list_lock);
 459 }
 460
 461 static irqreturn_t
 462 irq_handler(int irq, void *device)
 463 {
 464         struct pcilynx *lynx = device;
 465         u32 pci_int_status;
 466
 467         pci_int_status = reg_read(lynx, PCI_INT_STATUS);
 468
 469         if (pci_int_status == ~0)
 470                 /* Card was ejected. */
 471                 return IRQ_NONE;
 472
 473         if ((pci_int_status & PCI_INT_INT_PEND) == 0)
 474                 /* Not our interrupt, bail out quickly. */
 475                 return IRQ_NONE;
 476
 477         if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
 478                 u32 link_int_status;
 479
 480                 link_int_status = reg_read(lynx, LINK_INT_STATUS);
 481                 reg_write(lynx, LINK_INT_STATUS, link_int_status);
 482
 483                 if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
 484                         bus_reset_irq_handler(lynx);
 485         }
 486
 487         /* Clear the PCI_INT_STATUS register only after clearing the
 488          * LINK_INT_STATUS register; otherwise the PCI_INT_P1394 will
 489          * be set again immediately. */
 490
 491         reg_write(lynx, PCI_INT_STATUS, pci_int_status);
 492
 493         if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
 494                 packet_irq_handler(lynx);
 495                 run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
 496         }
 497
 498         return IRQ_HANDLED;
 499 }
 500
 501 static void
 502 remove_card(struct pci_dev *dev)
 503 {
 504         struct pcilynx *lynx = pci_get_drvdata(dev);
 505         struct client *client;
 506
 507         mutex_lock(&card_mutex);
 508         list_del_init(&lynx->link);
 509         misc_deregister(&lynx->misc);
 510         mutex_unlock(&card_mutex);
 511
 512         reg_write(lynx, PCI_INT_ENABLE, 0);
 513         free_irq(lynx->pci_device->irq, lynx);
 514
 515         spin_lock_irq(&lynx->client_list_lock);
 516         list_for_each_entry(client, &lynx->client_list, link)
 517                 wake_up_interruptible(&client->buffer.wait);
 518         spin_unlock_irq(&lynx->client_list_lock);
 519
 520         pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 521                             lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
 522         pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 523                             lynx->rcv_pcl, lynx->rcv_pcl_bus);
 524         pci_free_consistent(lynx->pci_device, PAGE_SIZE,
 525                             lynx->rcv_buffer, lynx->rcv_buffer_bus);
 526
 527         iounmap(lynx->registers);
 528         pci_disable_device(dev);
 529         lynx_put(lynx);
 530 }
 531
 532 #define RCV_BUFFER_SIZE (16 * 1024)
 533
 534 static int
 535 add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 536 {
 537         struct pcilynx *lynx;
 538         u32 p, end;
 539         int ret, i;
 540
 541         if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
 542                 dev_err(&dev->dev,
 543                     "DMA address limits not supported for PCILynx hardware\n");
 544                 return -ENXIO;
 545         }
 546         if (pci_enable_device(dev)) {
 547                 dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
 548                 return -ENXIO;
 549         }
 550         pci_set_master(dev);
 551
 552         lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
 553         if (lynx == NULL) {
 554                 dev_err(&dev->dev, "Failed to allocate control structure\n");
 555                 ret = -ENOMEM;
 556                 goto fail_disable;
 557         }
 558         lynx->pci_device = dev;
 559         pci_set_drvdata(dev, lynx);
 560
 561         spin_lock_init(&lynx->client_list_lock);
 562         INIT_LIST_HEAD(&lynx->client_list);
 563         kref_init(&lynx->kref);
 564
 565         lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
 566                                           PCILYNX_MAX_REGISTER);
 567
 568         lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
 569                                 sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
 570         lynx->rcv_pcl = pci_alloc_consistent(lynx->pci_device,
 571                                 sizeof(struct pcl), &lynx->rcv_pcl_bus);
 572         lynx->rcv_buffer = pci_alloc_consistent(lynx->pci_device,
 573                                 RCV_BUFFER_SIZE, &lynx->rcv_buffer_bus);
 574         if (lynx->rcv_start_pcl == NULL ||
 575             lynx->rcv_pcl == NULL ||
 576             lynx->rcv_buffer == NULL) {
 577                 dev_err(&dev->dev, "Failed to allocate receive buffer\n");
 578                 ret = -ENOMEM;
 579                 goto fail_deallocate;
 580         }
 581         lynx->rcv_start_pcl->next       = cpu_to_le32(lynx->rcv_pcl_bus);
 582         lynx->rcv_pcl->next             = cpu_to_le32(PCL_NEXT_INVALID);
 583         lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
 584
 585         lynx->rcv_pcl->buffer[0].control =
 586                         cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
 587         lynx->rcv_pcl->buffer[0].pointer =
 588                         cpu_to_le32(lynx->rcv_buffer_bus + 4);
 589         p = lynx->rcv_buffer_bus + 2048;
 590         end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
 591         for (i = 1; p < end; i++, p += 2048) {
 592                 lynx->rcv_pcl->buffer[i].control =
 593                         cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
 594                 lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
 595         }
 596         lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
 597
 598         reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
 599         /* Fix buggy cards with autoboot pin not tied low: */
 600         reg_write(lynx, DMA0_CHAN_CTRL, 0);
 601         reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
 602
 603 #if 0
 604         /* now, looking for PHY register set */
 605         if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
 606                 lynx->phyic.reg_1394a = 1;
 607                 PRINT(KERN_INFO, lynx->id,
 608                       "found 1394a conform PHY (using extended register set)");
 609                 lynx->phyic.vendor = get_phy_vendorid(lynx);
 610                 lynx->phyic.product = get_phy_productid(lynx);
 611         } else {
 612                 lynx->phyic.reg_1394a = 0;
 613                 PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
 614         }
 615 #endif
 616
 617         /* Setup the general receive FIFO max size. */
 618         reg_write(lynx, FIFO_SIZES, 255);
 619
 620         reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
 621
 622         reg_write(lynx, LINK_INT_ENABLE,
 623                   LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
 624                   LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
 625                   LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
 626                   LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
 627                   LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
 628
 629         /* Disable the L flag in self ID packets. */
 630         set_phy_reg(lynx, 4, 0);
 631
 632         /* Put this baby into snoop mode */
 633         reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
 634
 635         run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
 636
 637         if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
 638                         driver_name, lynx)) {
 639                 dev_err(&dev->dev,
 640                         "Failed to allocate shared interrupt %d\n", dev->irq);
 641                 ret = -EIO;
 642                 goto fail_deallocate;
 643         }
 644
 645         lynx->misc.parent = &dev->dev;
 646         lynx->misc.minor = MISC_DYNAMIC_MINOR;
 647         lynx->misc.name = "nosy";
 648         lynx->misc.fops = &nosy_ops;
 649
 650         mutex_lock(&card_mutex);
 651         ret = misc_register(&lynx->misc);
 652         if (ret) {
 653                 dev_err(&dev->dev, "Failed to register misc char device\n");
 654                 mutex_unlock(&card_mutex);
 655                 goto fail_free_irq;
 656         }
 657         list_add_tail(&lynx->link, &card_list);
 658         mutex_unlock(&card_mutex);
 659
 660         dev_info(&dev->dev,
 661                  "Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
 662
 663         return 0;
 664
 665 fail_free_irq:
 666         reg_write(lynx, PCI_INT_ENABLE, 0);
 667         free_irq(lynx->pci_device->irq, lynx);
 668
 669 fail_deallocate:
 670         if (lynx->rcv_start_pcl)
 671                 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 672                                 lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
 673         if (lynx->rcv_pcl)
 674                 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 675                                 lynx->rcv_pcl, lynx->rcv_pcl_bus);
 676         if (lynx->rcv_buffer)
 677                 pci_free_consistent(lynx->pci_device, PAGE_SIZE,
 678                                 lynx->rcv_buffer, lynx->rcv_buffer_bus);
 679         iounmap(lynx->registers);
 680         kfree(lynx);
 681
 682 fail_disable:
 683         pci_disable_device(dev);
 684
 685         return ret;
 686 }
 687
 688 static struct pci_device_id pci_table[] = {
 689         {
 690                 .vendor =    PCI_VENDOR_ID_TI,
 691                 .device =    PCI_DEVICE_ID_TI_PCILYNX,
 692                 .subvendor = PCI_ANY_ID,
 693                 .subdevice = PCI_ANY_ID,
 694         },
 695         { }     /* Terminating entry */
 696 };
 697
 698 MODULE_DEVICE_TABLE(pci, pci_table);
 699
 700 static struct pci_driver lynx_pci_driver = {
 701         .name =         driver_name,
 702         .id_table =     pci_table,
 703         .probe =        add_card,
 704         .remove =       remove_card,
 705 };
 706
 707 module_pci_driver(lynx_pci_driver);
 708
 709 MODULE_AUTHOR("Kristian Hoegsberg");
 710 MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
 711 MODULE_LICENSE("GPL");