drivers/s390/net/lcs.c

   1 /*
   2  *  Linux for S/390 Lan Channel Station Network Driver
   3  *
   4  *  Copyright IBM Corp. 1999, 2009
   5  *  Author(s): Original Code written by
   6  *                      DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
   7  *             Rewritten by
   8  *                      Frank Pavlic <fpavlic@de.ibm.com> and
   9  *                      Martin Schwidefsky <schwidefsky@de.ibm.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #define KMSG_COMPONENT          "lcs"
  27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  28
  29 #include <linux/module.h>
  30 #include <linux/if.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/fddidevice.h>
  34 #include <linux/inetdevice.h>
  35 #include <linux/in.h>
  36 #include <linux/igmp.h>
  37 #include <linux/delay.h>
  38 #include <linux/kthread.h>
  39 #include <linux/slab.h>
  40 #include <net/arp.h>
  41 #include <net/ip.h>
  42
  43 #include <asm/debug.h>
  44 #include <asm/idals.h>
  45 #include <asm/timex.h>
  46 #include <linux/device.h>
  47 #include <asm/ccwgroup.h>
  48
  49 #include "lcs.h"
  50
  51
  52 #if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
  53 #error Cannot compile lcs.c without some net devices switched on.
  54 #endif
  55
  56 /**
  57  * initialization string for output
  58  */
  59
  60 static char version[] __initdata = "LCS driver";
  61
  62 /**
  63   * the root device for lcs group devices
  64   */
  65 static struct device *lcs_root_dev;
  66
  67 /**
  68  * Some prototypes.
  69  */
  70 static void lcs_tasklet(unsigned long);
  71 static void lcs_start_kernel_thread(struct work_struct *);
  72 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  73 #ifdef CONFIG_IP_MULTICAST
  74 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  75 #endif /* CONFIG_IP_MULTICAST */
  76 static int lcs_recovery(void *ptr);
  77
  78 /**
  79  * Debug Facility Stuff
  80  */
  81 static char debug_buffer[255];
  82 static debug_info_t *lcs_dbf_setup;
  83 static debug_info_t *lcs_dbf_trace;
  84
  85 /**
  86  *  LCS Debug Facility functions
  87  */
  88 static void
  89 lcs_unregister_debug_facility(void)
  90 {
  91         debug_unregister(lcs_dbf_setup);
  92         debug_unregister(lcs_dbf_trace);
  93 }
  94
  95 static int
  96 lcs_register_debug_facility(void)
  97 {
  98         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
  99         lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
 100         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
 101                 pr_err("Not enough memory for debug facility.\n");
 102                 lcs_unregister_debug_facility();
 103                 return -ENOMEM;
 104         }
 105         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 106         debug_set_level(lcs_dbf_setup, 2);
 107         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 108         debug_set_level(lcs_dbf_trace, 2);
 109         return 0;
 110 }
 111
 112 /**
 113  * Allocate io buffers.
 114  */
 115 static int
 116 lcs_alloc_channel(struct lcs_channel *channel)
 117 {
 118         int cnt;
 119
 120         LCS_DBF_TEXT(2, setup, "ichalloc");
 121         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 122                 /* alloc memory fo iobuffer */
 123                 channel->iob[cnt].data =
 124                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 125                 if (channel->iob[cnt].data == NULL)
 126                         break;
 127                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
 128         }
 129         if (cnt < LCS_NUM_BUFFS) {
 130                 /* Not all io buffers could be allocated. */
 131                 LCS_DBF_TEXT(2, setup, "echalloc");
 132                 while (cnt-- > 0)
 133                         kfree(channel->iob[cnt].data);
 134                 return -ENOMEM;
 135         }
 136         return 0;
 137 }
 138
 139 /**
 140  * Free io buffers.
 141  */
 142 static void
 143 lcs_free_channel(struct lcs_channel *channel)
 144 {
 145         int cnt;
 146
 147         LCS_DBF_TEXT(2, setup, "ichfree");
 148         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 149                 kfree(channel->iob[cnt].data);
 150                 channel->iob[cnt].data = NULL;
 151         }
 152 }
 153
 154 /*
 155  * Cleanup channel.
 156  */
 157 static void
 158 lcs_cleanup_channel(struct lcs_channel *channel)
 159 {
 160         LCS_DBF_TEXT(3, setup, "cleanch");
 161         /* Kill write channel tasklets. */
 162         tasklet_kill(&channel->irq_tasklet);
 163         /* Free channel buffers. */
 164         lcs_free_channel(channel);
 165 }
 166
 167 /**
 168  * LCS free memory for card and channels.
 169  */
 170 static void
 171 lcs_free_card(struct lcs_card *card)
 172 {
 173         LCS_DBF_TEXT(2, setup, "remcard");
 174         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 175         kfree(card);
 176 }
 177
 178 /**
 179  * LCS alloc memory for card and channels
 180  */
 181 static struct lcs_card *
 182 lcs_alloc_card(void)
 183 {
 184         struct lcs_card *card;
 185         int rc;
 186
 187         LCS_DBF_TEXT(2, setup, "alloclcs");
 188
 189         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 190         if (card == NULL)
 191                 return NULL;
 192         card->lan_type = LCS_FRAME_TYPE_AUTO;
 193         card->pkt_seq = 0;
 194         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 195         /* Allocate io buffers for the read channel. */
 196         rc = lcs_alloc_channel(&card->read);
 197         if (rc){
 198                 LCS_DBF_TEXT(2, setup, "iccwerr");
 199                 lcs_free_card(card);
 200                 return NULL;
 201         }
 202         /* Allocate io buffers for the write channel. */
 203         rc = lcs_alloc_channel(&card->write);
 204         if (rc) {
 205                 LCS_DBF_TEXT(2, setup, "iccwerr");
 206                 lcs_cleanup_channel(&card->read);
 207                 lcs_free_card(card);
 208                 return NULL;
 209         }
 210
 211 #ifdef CONFIG_IP_MULTICAST
 212         INIT_LIST_HEAD(&card->ipm_list);
 213 #endif
 214         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 215         return card;
 216 }
 217
 218 /*
 219  * Setup read channel.
 220  */
 221 static void
 222 lcs_setup_read_ccws(struct lcs_card *card)
 223 {
 224         int cnt;
 225
 226         LCS_DBF_TEXT(2, setup, "ireadccw");
 227         /* Setup read ccws. */
 228         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 229         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 230                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 231                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 232                 card->read.ccws[cnt].flags =
 233                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 234                 /*
 235                  * Note: we have allocated the buffer with GFP_DMA, so
 236                  * we do not need to do set_normalized_cda.
 237                  */
 238                 card->read.ccws[cnt].cda =
 239                         (__u32) __pa(card->read.iob[cnt].data);
 240                 ((struct lcs_header *)
 241                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 242                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 243                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
 244                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 245         }
 246         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 247         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 248         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 249         /* Last ccw is a tic (transfer in channel). */
 250         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 251         card->read.ccws[LCS_NUM_BUFFS].cda =
 252                 (__u32) __pa(card->read.ccws);
 253         /* Setg initial state of the read channel. */
 254         card->read.state = LCS_CH_STATE_INIT;
 255
 256         card->read.io_idx = 0;
 257         card->read.buf_idx = 0;
 258 }
 259
 260 static void
 261 lcs_setup_read(struct lcs_card *card)
 262 {
 263         LCS_DBF_TEXT(3, setup, "initread");
 264
 265         lcs_setup_read_ccws(card);
 266         /* Initialize read channel tasklet. */
 267         card->read.irq_tasklet.data = (unsigned long) &card->read;
 268         card->read.irq_tasklet.func = lcs_tasklet;
 269         /* Initialize waitqueue. */
 270         init_waitqueue_head(&card->read.wait_q);
 271 }
 272
 273 /*
 274  * Setup write channel.
 275  */
 276 static void
 277 lcs_setup_write_ccws(struct lcs_card *card)
 278 {
 279         int cnt;
 280
 281         LCS_DBF_TEXT(3, setup, "iwritccw");
 282         /* Setup write ccws. */
 283         memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
 284         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 285                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 286                 card->write.ccws[cnt].count = 0;
 287                 card->write.ccws[cnt].flags =
 288                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 289                 /*
 290                  * Note: we have allocated the buffer with GFP_DMA, so
 291                  * we do not need to do set_normalized_cda.
 292                  */
 293                 card->write.ccws[cnt].cda =
 294                         (__u32) __pa(card->write.iob[cnt].data);
 295         }
 296         /* Last ccw is a tic (transfer in channel). */
 297         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 298         card->write.ccws[LCS_NUM_BUFFS].cda =
 299                 (__u32) __pa(card->write.ccws);
 300         /* Set initial state of the write channel. */
 301         card->read.state = LCS_CH_STATE_INIT;
 302
 303         card->write.io_idx = 0;
 304         card->write.buf_idx = 0;
 305 }
 306
 307 static void
 308 lcs_setup_write(struct lcs_card *card)
 309 {
 310         LCS_DBF_TEXT(3, setup, "initwrit");
 311
 312         lcs_setup_write_ccws(card);
 313         /* Initialize write channel tasklet. */
 314         card->write.irq_tasklet.data = (unsigned long) &card->write;
 315         card->write.irq_tasklet.func = lcs_tasklet;
 316         /* Initialize waitqueue. */
 317         init_waitqueue_head(&card->write.wait_q);
 318 }
 319
 320 static void
 321 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 322 {
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&card->mask_lock, flags);
 326         card->thread_allowed_mask = threads;
 327         spin_unlock_irqrestore(&card->mask_lock, flags);
 328         wake_up(&card->wait_q);
 329 }
 330 static int lcs_threads_running(struct lcs_card *card, unsigned long threads)
 331 {
 332         unsigned long flags;
 333         int rc = 0;
 334
 335         spin_lock_irqsave(&card->mask_lock, flags);
 336         rc = (card->thread_running_mask & threads);
 337         spin_unlock_irqrestore(&card->mask_lock, flags);
 338         return rc;
 339 }
 340
 341 static int
 342 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 343 {
 344         return wait_event_interruptible(card->wait_q,
 345                         lcs_threads_running(card, threads) == 0);
 346 }
 347
 348 static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 349 {
 350         unsigned long flags;
 351
 352         spin_lock_irqsave(&card->mask_lock, flags);
 353         if ( !(card->thread_allowed_mask & thread) ||
 354               (card->thread_start_mask & thread) ) {
 355                 spin_unlock_irqrestore(&card->mask_lock, flags);
 356                 return -EPERM;
 357         }
 358         card->thread_start_mask |= thread;
 359         spin_unlock_irqrestore(&card->mask_lock, flags);
 360         return 0;
 361 }
 362
 363 static void
 364 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 365 {
 366         unsigned long flags;
 367
 368         spin_lock_irqsave(&card->mask_lock, flags);
 369         card->thread_running_mask &= ~thread;
 370         spin_unlock_irqrestore(&card->mask_lock, flags);
 371         wake_up(&card->wait_q);
 372 }
 373
 374 static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 375 {
 376         unsigned long flags;
 377         int rc = 0;
 378
 379         spin_lock_irqsave(&card->mask_lock, flags);
 380         if (card->thread_start_mask & thread){
 381                 if ((card->thread_allowed_mask & thread) &&
 382                     !(card->thread_running_mask & thread)){
 383                         rc = 1;
 384                         card->thread_start_mask &= ~thread;
 385                         card->thread_running_mask |= thread;
 386                 } else
 387                         rc = -EPERM;
 388         }
 389         spin_unlock_irqrestore(&card->mask_lock, flags);
 390         return rc;
 391 }
 392
 393 static int
 394 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 395 {
 396         int rc = 0;
 397         wait_event(card->wait_q,
 398                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 399         return rc;
 400 }
 401
 402 static int
 403 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 404 {
 405         unsigned long flags;
 406         int rc = 0;
 407
 408         spin_lock_irqsave(&card->mask_lock, flags);
 409         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 410                         (u8) card->thread_start_mask,
 411                         (u8) card->thread_allowed_mask,
 412                         (u8) card->thread_running_mask);
 413         rc = (card->thread_start_mask & thread);
 414         spin_unlock_irqrestore(&card->mask_lock, flags);
 415         return rc;
 416 }
 417
 418 /**
 419  * Initialize channels,card and state machines.
 420  */
 421 static void
 422 lcs_setup_card(struct lcs_card *card)
 423 {
 424         LCS_DBF_TEXT(2, setup, "initcard");
 425         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 426
 427         lcs_setup_read(card);
 428         lcs_setup_write(card);
 429         /* Set cards initial state. */
 430         card->state = DEV_STATE_DOWN;
 431         card->tx_buffer = NULL;
 432         card->tx_emitted = 0;
 433
 434         init_waitqueue_head(&card->wait_q);
 435         spin_lock_init(&card->lock);
 436         spin_lock_init(&card->ipm_lock);
 437         spin_lock_init(&card->mask_lock);
 438 #ifdef CONFIG_IP_MULTICAST
 439         INIT_LIST_HEAD(&card->ipm_list);
 440 #endif
 441         INIT_LIST_HEAD(&card->lancmd_waiters);
 442 }
 443
 444 static void lcs_clear_multicast_list(struct lcs_card *card)
 445 {
 446 #ifdef  CONFIG_IP_MULTICAST
 447         struct lcs_ipm_list *ipm;
 448         unsigned long flags;
 449
 450         /* Free multicast list. */
 451         LCS_DBF_TEXT(3, setup, "clmclist");
 452         spin_lock_irqsave(&card->ipm_lock, flags);
 453         while (!list_empty(&card->ipm_list)){
 454                 ipm = list_entry(card->ipm_list.next,
 455                                  struct lcs_ipm_list, list);
 456                 list_del(&ipm->list);
 457                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 458                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 459                         lcs_send_delipm(card, ipm);
 460                         spin_lock_irqsave(&card->ipm_lock, flags);
 461                 }
 462                 kfree(ipm);
 463         }
 464         spin_unlock_irqrestore(&card->ipm_lock, flags);
 465 #endif
 466 }
 467 /**
 468  * Cleanup channels,card and state machines.
 469  */
 470 static void
 471 lcs_cleanup_card(struct lcs_card *card)
 472 {
 473
 474         LCS_DBF_TEXT(3, setup, "cleancrd");
 475         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 476
 477         if (card->dev != NULL)
 478                 free_netdev(card->dev);
 479         /* Cleanup channels. */
 480         lcs_cleanup_channel(&card->write);
 481         lcs_cleanup_channel(&card->read);
 482 }
 483
 484 /**
 485  * Start channel.
 486  */
 487 static int
 488 lcs_start_channel(struct lcs_channel *channel)
 489 {
 490         unsigned long flags;
 491         int rc;
 492
 493         LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
 494         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 495         rc = ccw_device_start(channel->ccwdev,
 496                               channel->ccws + channel->io_idx, 0, 0,
 497                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 498         if (rc == 0)
 499                 channel->state = LCS_CH_STATE_RUNNING;
 500         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 501         if (rc) {
 502                 LCS_DBF_TEXT_(4,trace,"essh%s",
 503                               dev_name(&channel->ccwdev->dev));
 504                 dev_err(&channel->ccwdev->dev,
 505                         "Starting an LCS device resulted in an error,"
 506                         " rc=%d!\n", rc);
 507         }
 508         return rc;
 509 }
 510
 511 static int
 512 lcs_clear_channel(struct lcs_channel *channel)
 513 {
 514         unsigned long flags;
 515         int rc;
 516
 517         LCS_DBF_TEXT(4,trace,"clearch");
 518         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 519         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 520         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 521         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 522         if (rc) {
 523                 LCS_DBF_TEXT_(4, trace, "ecsc%s",
 524                               dev_name(&channel->ccwdev->dev));
 525                 return rc;
 526         }
 527         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
 528         channel->state = LCS_CH_STATE_STOPPED;
 529         return rc;
 530 }
 531
 532
 533 /**
 534  * Stop channel.
 535  */
 536 static int
 537 lcs_stop_channel(struct lcs_channel *channel)
 538 {
 539         unsigned long flags;
 540         int rc;
 541
 542         if (channel->state == LCS_CH_STATE_STOPPED)
 543                 return 0;
 544         LCS_DBF_TEXT(4,trace,"haltsch");
 545         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 546         channel->state = LCS_CH_STATE_INIT;
 547         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 548         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 549         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 550         if (rc) {
 551                 LCS_DBF_TEXT_(4, trace, "ehsc%s",
 552                               dev_name(&channel->ccwdev->dev));
 553                 return rc;
 554         }
 555         /* Asynchronous halt initialted. Wait for its completion. */
 556         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
 557         lcs_clear_channel(channel);
 558         return 0;
 559 }
 560
 561 /**
 562  * start read and write channel
 563  */
 564 static int
 565 lcs_start_channels(struct lcs_card *card)
 566 {
 567         int rc;
 568
 569         LCS_DBF_TEXT(2, trace, "chstart");
 570         /* start read channel */
 571         rc = lcs_start_channel(&card->read);
 572         if (rc)
 573                 return rc;
 574         /* start write channel */
 575         rc = lcs_start_channel(&card->write);
 576         if (rc)
 577                 lcs_stop_channel(&card->read);
 578         return rc;
 579 }
 580
 581 /**
 582  * stop read and write channel
 583  */
 584 static int
 585 lcs_stop_channels(struct lcs_card *card)
 586 {
 587         LCS_DBF_TEXT(2, trace, "chhalt");
 588         lcs_stop_channel(&card->read);
 589         lcs_stop_channel(&card->write);
 590         return 0;
 591 }
 592
 593 /**
 594  * Get empty buffer.
 595  */
 596 static struct lcs_buffer *
 597 __lcs_get_buffer(struct lcs_channel *channel)
 598 {
 599         int index;
 600
 601         LCS_DBF_TEXT(5, trace, "_getbuff");
 602         index = channel->io_idx;
 603         do {
 604                 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
 605                         channel->iob[index].state = LCS_BUF_STATE_LOCKED;
 606                         return channel->iob + index;
 607                 }
 608                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 609         } while (index != channel->io_idx);
 610         return NULL;
 611 }
 612
 613 static struct lcs_buffer *
 614 lcs_get_buffer(struct lcs_channel *channel)
 615 {
 616         struct lcs_buffer *buffer;
 617         unsigned long flags;
 618
 619         LCS_DBF_TEXT(5, trace, "getbuff");
 620         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 621         buffer = __lcs_get_buffer(channel);
 622         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 623         return buffer;
 624 }
 625
 626 /**
 627  * Resume channel program if the channel is suspended.
 628  */
 629 static int
 630 __lcs_resume_channel(struct lcs_channel *channel)
 631 {
 632         int rc;
 633
 634         if (channel->state != LCS_CH_STATE_SUSPENDED)
 635                 return 0;
 636         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 637                 return 0;
 638         LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
 639         rc = ccw_device_resume(channel->ccwdev);
 640         if (rc) {
 641                 LCS_DBF_TEXT_(4, trace, "ersc%s",
 642                               dev_name(&channel->ccwdev->dev));
 643                 dev_err(&channel->ccwdev->dev,
 644                         "Sending data from the LCS device to the LAN failed"
 645                         " with rc=%d\n",rc);
 646         } else
 647                 channel->state = LCS_CH_STATE_RUNNING;
 648         return rc;
 649
 650 }
 651
 652 /**
 653  * Make a buffer ready for processing.
 654  */
 655 static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 656 {
 657         int prev, next;
 658
 659         LCS_DBF_TEXT(5, trace, "rdybits");
 660         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 661         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 662         /* Check if we may clear the suspend bit of this buffer. */
 663         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 664                 /* Check if we have to set the PCI bit. */
 665                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 666                         /* Suspend bit of the previous buffer is not set. */
 667                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 668                 /* Suspend bit of the next buffer is set. */
 669                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 670         }
 671 }
 672
 673 static int
 674 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 675 {
 676         unsigned long flags;
 677         int index, rc;
 678
 679         LCS_DBF_TEXT(5, trace, "rdybuff");
 680         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 681                buffer->state != LCS_BUF_STATE_PROCESSED);
 682         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 683         buffer->state = LCS_BUF_STATE_READY;
 684         index = buffer - channel->iob;
 685         /* Set length. */
 686         channel->ccws[index].count = buffer->count;
 687         /* Check relevant PCI/suspend bits. */
 688         __lcs_ready_buffer_bits(channel, index);
 689         rc = __lcs_resume_channel(channel);
 690         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 691         return rc;
 692 }
 693
 694 /**
 695  * Mark the buffer as processed. Take care of the suspend bit
 696  * of the previous buffer. This function is called from
 697  * interrupt context, so the lock must not be taken.
 698  */
 699 static int
 700 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 701 {
 702         int index, prev, next;
 703
 704         LCS_DBF_TEXT(5, trace, "prcsbuff");
 705         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
 706         buffer->state = LCS_BUF_STATE_PROCESSED;
 707         index = buffer - channel->iob;
 708         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 709         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 710         /* Set the suspend bit and clear the PCI bit of this buffer. */
 711         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 712         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 713         /* Check the suspend bit of the previous buffer. */
 714         if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
 715                 /*
 716                  * Previous buffer is in state ready. It might have
 717                  * happened in lcs_ready_buffer that the suspend bit
 718                  * has not been cleared to avoid an endless loop.
 719                  * Do it now.
 720                  */
 721                 __lcs_ready_buffer_bits(channel, prev);
 722         }
 723         /* Clear PCI bit of next buffer. */
 724         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 725         return __lcs_resume_channel(channel);
 726 }
 727
 728 /**
 729  * Put a processed buffer back to state empty.
 730  */
 731 static void
 732 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 733 {
 734         unsigned long flags;
 735
 736         LCS_DBF_TEXT(5, trace, "relbuff");
 737         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 738                buffer->state != LCS_BUF_STATE_PROCESSED);
 739         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 740         buffer->state = LCS_BUF_STATE_EMPTY;
 741         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 742 }
 743
 744 /**
 745  * Get buffer for a lan command.
 746  */
 747 static struct lcs_buffer *
 748 lcs_get_lancmd(struct lcs_card *card, int count)
 749 {
 750         struct lcs_buffer *buffer;
 751         struct lcs_cmd *cmd;
 752
 753         LCS_DBF_TEXT(4, trace, "getlncmd");
 754         /* Get buffer and wait if none is available. */
 755         wait_event(card->write.wait_q,
 756                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 757         count += sizeof(struct lcs_header);
 758         *(__u16 *)(buffer->data + count) = 0;
 759         buffer->count = count + sizeof(__u16);
 760         buffer->callback = lcs_release_buffer;
 761         cmd = (struct lcs_cmd *) buffer->data;
 762         cmd->offset = count;
 763         cmd->type = LCS_FRAME_TYPE_CONTROL;
 764         cmd->slot = 0;
 765         return buffer;
 766 }
 767
 768
 769 static void
 770 lcs_get_reply(struct lcs_reply *reply)
 771 {
 772         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 773         atomic_inc(&reply->refcnt);
 774 }
 775
 776 static void
 777 lcs_put_reply(struct lcs_reply *reply)
 778 {
 779         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 780         if (atomic_dec_and_test(&reply->refcnt)) {
 781                 kfree(reply);
 782         }
 783
 784 }
 785
 786 static struct lcs_reply *
 787 lcs_alloc_reply(struct lcs_cmd *cmd)
 788 {
 789         struct lcs_reply *reply;
 790
 791         LCS_DBF_TEXT(4, trace, "getreply");
 792
 793         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 794         if (!reply)
 795                 return NULL;
 796         atomic_set(&reply->refcnt,1);
 797         reply->sequence_no = cmd->sequence_no;
 798         reply->received = 0;
 799         reply->rc = 0;
 800         init_waitqueue_head(&reply->wait_q);
 801
 802         return reply;
 803 }
 804
 805 /**
 806  * Notifier function for lancmd replies. Called from read irq.
 807  */
 808 static void
 809 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 810 {
 811         struct list_head *l, *n;
 812         struct lcs_reply *reply;
 813
 814         LCS_DBF_TEXT(4, trace, "notiwait");
 815         spin_lock(&card->lock);
 816         list_for_each_safe(l, n, &card->lancmd_waiters) {
 817                 reply = list_entry(l, struct lcs_reply, list);
 818                 if (reply->sequence_no == cmd->sequence_no) {
 819                         lcs_get_reply(reply);
 820                         list_del_init(&reply->list);
 821                         if (reply->callback != NULL)
 822                                 reply->callback(card, cmd);
 823                         reply->received = 1;
 824                         reply->rc = cmd->return_code;
 825                         wake_up(&reply->wait_q);
 826                         lcs_put_reply(reply);
 827                         break;
 828                 }
 829         }
 830         spin_unlock(&card->lock);
 831 }
 832
 833 /**
 834  * Emit buffer of a lan command.
 835  */
 836 static void
 837 lcs_lancmd_timeout(unsigned long data)
 838 {
 839         struct lcs_reply *reply, *list_reply, *r;
 840         unsigned long flags;
 841
 842         LCS_DBF_TEXT(4, trace, "timeout");
 843         reply = (struct lcs_reply *) data;
 844         spin_lock_irqsave(&reply->card->lock, flags);
 845         list_for_each_entry_safe(list_reply, r,
 846                                  &reply->card->lancmd_waiters,list) {
 847                 if (reply == list_reply) {
 848                         lcs_get_reply(reply);
 849                         list_del_init(&reply->list);
 850                         spin_unlock_irqrestore(&reply->card->lock, flags);
 851                         reply->received = 1;
 852                         reply->rc = -ETIME;
 853                         wake_up(&reply->wait_q);
 854                         lcs_put_reply(reply);
 855                         return;
 856                 }
 857         }
 858         spin_unlock_irqrestore(&reply->card->lock, flags);
 859 }
 860
 861 static int
 862 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 863                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 864 {
 865         struct lcs_reply *reply;
 866         struct lcs_cmd *cmd;
 867         struct timer_list timer;
 868         unsigned long flags;
 869         int rc;
 870
 871         LCS_DBF_TEXT(4, trace, "sendcmd");
 872         cmd = (struct lcs_cmd *) buffer->data;
 873         cmd->return_code = 0;
 874         cmd->sequence_no = card->sequence_no++;
 875         reply = lcs_alloc_reply(cmd);
 876         if (!reply)
 877                 return -ENOMEM;
 878         reply->callback = reply_callback;
 879         reply->card = card;
 880         spin_lock_irqsave(&card->lock, flags);
 881         list_add_tail(&reply->list, &card->lancmd_waiters);
 882         spin_unlock_irqrestore(&card->lock, flags);
 883
 884         buffer->callback = lcs_release_buffer;
 885         rc = lcs_ready_buffer(&card->write, buffer);
 886         if (rc)
 887                 return rc;
 888         init_timer_on_stack(&timer);
 889         timer.function = lcs_lancmd_timeout;
 890         timer.data = (unsigned long) reply;
 891         timer.expires = jiffies + HZ*card->lancmd_timeout;
 892         add_timer(&timer);
 893         wait_event(reply->wait_q, reply->received);
 894         del_timer_sync(&timer);
 895         destroy_timer_on_stack(&timer);
 896         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 897         rc = reply->rc;
 898         lcs_put_reply(reply);
 899         return rc ? -EIO : 0;
 900 }
 901
 902 /**
 903  * LCS startup command
 904  */
 905 static int
 906 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 907 {
 908         struct lcs_buffer *buffer;
 909         struct lcs_cmd *cmd;
 910
 911         LCS_DBF_TEXT(2, trace, "startup");
 912         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 913         cmd = (struct lcs_cmd *) buffer->data;
 914         cmd->cmd_code = LCS_CMD_STARTUP;
 915         cmd->initiator = initiator;
 916         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 917         return lcs_send_lancmd(card, buffer, NULL);
 918 }
 919
 920 /**
 921  * LCS shutdown command
 922  */
 923 static int
 924 lcs_send_shutdown(struct lcs_card *card)
 925 {
 926         struct lcs_buffer *buffer;
 927         struct lcs_cmd *cmd;
 928
 929         LCS_DBF_TEXT(2, trace, "shutdown");
 930         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 931         cmd = (struct lcs_cmd *) buffer->data;
 932         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 933         cmd->initiator = LCS_INITIATOR_TCPIP;
 934         return lcs_send_lancmd(card, buffer, NULL);
 935 }
 936
 937 /**
 938  * LCS lanstat command
 939  */
 940 static void
 941 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 942 {
 943         LCS_DBF_TEXT(2, trace, "statcb");
 944         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 945 }
 946
 947 static int
 948 lcs_send_lanstat(struct lcs_card *card)
 949 {
 950         struct lcs_buffer *buffer;
 951         struct lcs_cmd *cmd;
 952
 953         LCS_DBF_TEXT(2,trace, "cmdstat");
 954         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 955         cmd = (struct lcs_cmd *) buffer->data;
 956         /* Setup lanstat command. */
 957         cmd->cmd_code = LCS_CMD_LANSTAT;
 958         cmd->initiator = LCS_INITIATOR_TCPIP;
 959         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 960         cmd->cmd.lcs_std_cmd.portno = card->portno;
 961         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 962 }
 963
 964 /**
 965  * send stoplan command
 966  */
 967 static int
 968 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 969 {
 970         struct lcs_buffer *buffer;
 971         struct lcs_cmd *cmd;
 972
 973         LCS_DBF_TEXT(2, trace, "cmdstpln");
 974         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 975         cmd = (struct lcs_cmd *) buffer->data;
 976         cmd->cmd_code = LCS_CMD_STOPLAN;
 977         cmd->initiator = initiator;
 978         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 979         cmd->cmd.lcs_std_cmd.portno = card->portno;
 980         return lcs_send_lancmd(card, buffer, NULL);
 981 }
 982
 983 /**
 984  * send startlan command
 985  */
 986 static void
 987 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 988 {
 989         LCS_DBF_TEXT(2, trace, "srtlancb");
 990         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 991         card->portno = cmd->cmd.lcs_std_cmd.portno;
 992 }
 993
 994 static int
 995 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
 996 {
 997         struct lcs_buffer *buffer;
 998         struct lcs_cmd *cmd;
 999
1000         LCS_DBF_TEXT(2, trace, "cmdstaln");
1001         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1002         cmd = (struct lcs_cmd *) buffer->data;
1003         cmd->cmd_code = LCS_CMD_STARTLAN;
1004         cmd->initiator = initiator;
1005         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1006         cmd->cmd.lcs_std_cmd.portno = card->portno;
1007         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1008 }
1009
1010 #ifdef CONFIG_IP_MULTICAST
1011 /**
1012  * send setipm command (Multicast)
1013  */
1014 static int
1015 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1016 {
1017         struct lcs_buffer *buffer;
1018         struct lcs_cmd *cmd;
1019
1020         LCS_DBF_TEXT(2, trace, "cmdsetim");
1021         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1022         cmd = (struct lcs_cmd *) buffer->data;
1023         cmd->cmd_code = LCS_CMD_SETIPM;
1024         cmd->initiator = LCS_INITIATOR_TCPIP;
1025         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1026         cmd->cmd.lcs_qipassist.portno = card->portno;
1027         cmd->cmd.lcs_qipassist.version = 4;
1028         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1029         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1030                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1031         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1032         return lcs_send_lancmd(card, buffer, NULL);
1033 }
1034
1035 /**
1036  * send delipm command (Multicast)
1037  */
1038 static int
1039 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1040 {
1041         struct lcs_buffer *buffer;
1042         struct lcs_cmd *cmd;
1043
1044         LCS_DBF_TEXT(2, trace, "cmddelim");
1045         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1046         cmd = (struct lcs_cmd *) buffer->data;
1047         cmd->cmd_code = LCS_CMD_DELIPM;
1048         cmd->initiator = LCS_INITIATOR_TCPIP;
1049         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1050         cmd->cmd.lcs_qipassist.portno = card->portno;
1051         cmd->cmd.lcs_qipassist.version = 4;
1052         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1053         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1054                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1055         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1056         return lcs_send_lancmd(card, buffer, NULL);
1057 }
1058
1059 /**
1060  * check if multicast is supported by LCS
1061  */
1062 static void
1063 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1064 {
1065         LCS_DBF_TEXT(2, trace, "chkmccb");
1066         card->ip_assists_supported =
1067                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1068         card->ip_assists_enabled =
1069                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1070 }
1071
1072 static int
1073 lcs_check_multicast_support(struct lcs_card *card)
1074 {
1075         struct lcs_buffer *buffer;
1076         struct lcs_cmd *cmd;
1077         int rc;
1078
1079         LCS_DBF_TEXT(2, trace, "cmdqipa");
1080         /* Send query ipassist. */
1081         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1082         cmd = (struct lcs_cmd *) buffer->data;
1083         cmd->cmd_code = LCS_CMD_QIPASSIST;
1084         cmd->initiator = LCS_INITIATOR_TCPIP;
1085         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1086         cmd->cmd.lcs_qipassist.portno = card->portno;
1087         cmd->cmd.lcs_qipassist.version = 4;
1088         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1089         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1090         if (rc != 0) {
1091                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1092                 return -EOPNOTSUPP;
1093         }
1094         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1095                 return 0;
1096         return -EOPNOTSUPP;
1097 }
1098
1099 /**
1100  * set or del multicast address on LCS card
1101  */
1102 static void
1103 lcs_fix_multicast_list(struct lcs_card *card)
1104 {
1105         struct list_head failed_list;
1106         struct lcs_ipm_list *ipm, *tmp;
1107         unsigned long flags;
1108         int rc;
1109
1110         LCS_DBF_TEXT(4,trace, "fixipm");
1111         INIT_LIST_HEAD(&failed_list);
1112         spin_lock_irqsave(&card->ipm_lock, flags);
1113 list_modified:
1114         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1115                 switch (ipm->ipm_state) {
1116                 case LCS_IPM_STATE_SET_REQUIRED:
1117                         /* del from ipm_list so no one else can tamper with
1118                          * this entry */
1119                         list_del_init(&ipm->list);
1120                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1121                         rc = lcs_send_setipm(card, ipm);
1122                         spin_lock_irqsave(&card->ipm_lock, flags);
1123                         if (rc) {
1124                                 pr_info("Adding multicast address failed."
1125                                         " Table possibly full!\n");
1126                                 /* store ipm in failed list -> will be added
1127                                  * to ipm_list again, so a retry will be done
1128                                  * during the next call of this function */
1129                                 list_add_tail(&ipm->list, &failed_list);
1130                         } else {
1131                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1132                                 /* re-insert into ipm_list */
1133                                 list_add_tail(&ipm->list, &card->ipm_list);
1134                         }
1135                         goto list_modified;
1136                 case LCS_IPM_STATE_DEL_REQUIRED:
1137                         list_del(&ipm->list);
1138                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1139                         lcs_send_delipm(card, ipm);
1140                         spin_lock_irqsave(&card->ipm_lock, flags);
1141                         kfree(ipm);
1142                         goto list_modified;
1143                 case LCS_IPM_STATE_ON_CARD:
1144                         break;
1145                 }
1146         }
1147         /* re-insert all entries from the failed_list into ipm_list */
1148         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1149                 list_move_tail(&ipm->list, &card->ipm_list);
1150
1151         spin_unlock_irqrestore(&card->ipm_lock, flags);
1152 }
1153
1154 /**
1155  * get mac address for the relevant Multicast address
1156  */
1157 static void
1158 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1159 {
1160         LCS_DBF_TEXT(4,trace, "getmac");
1161         ip_eth_mc_map(ipm, mac);
1162 }
1163
1164 /**
1165  * function called by net device to handle multicast address relevant things
1166  */
1167 static void lcs_remove_mc_addresses(struct lcs_card *card,
1168                                     struct in_device *in4_dev)
1169 {
1170         struct ip_mc_list *im4;
1171         struct list_head *l;
1172         struct lcs_ipm_list *ipm;
1173         unsigned long flags;
1174         char buf[MAX_ADDR_LEN];
1175
1176         LCS_DBF_TEXT(4, trace, "remmclst");
1177         spin_lock_irqsave(&card->ipm_lock, flags);
1178         list_for_each(l, &card->ipm_list) {
1179                 ipm = list_entry(l, struct lcs_ipm_list, list);
1180                 for (im4 = rcu_dereference(in4_dev->mc_list);
1181                      im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1182                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1183                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1184                              (memcmp(buf, &ipm->ipm.mac_addr,
1185                                      LCS_MAC_LENGTH) == 0) )
1186                                 break;
1187                 }
1188                 if (im4 == NULL)
1189                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1190         }
1191         spin_unlock_irqrestore(&card->ipm_lock, flags);
1192 }
1193
1194 static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card,
1195                                                  struct ip_mc_list *im4,
1196                                                  char *buf)
1197 {
1198         struct lcs_ipm_list *tmp, *ipm = NULL;
1199         struct list_head *l;
1200         unsigned long flags;
1201
1202         LCS_DBF_TEXT(4, trace, "chkmcent");
1203         spin_lock_irqsave(&card->ipm_lock, flags);
1204         list_for_each(l, &card->ipm_list) {
1205                 tmp = list_entry(l, struct lcs_ipm_list, list);
1206                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1207                      (memcmp(buf, &tmp->ipm.mac_addr,
1208                              LCS_MAC_LENGTH) == 0) ) {
1209                         ipm = tmp;
1210                         break;
1211                 }
1212         }
1213         spin_unlock_irqrestore(&card->ipm_lock, flags);
1214         return ipm;
1215 }
1216
1217 static void lcs_set_mc_addresses(struct lcs_card *card,
1218                                  struct in_device *in4_dev)
1219 {
1220
1221         struct ip_mc_list *im4;
1222         struct lcs_ipm_list *ipm;
1223         char buf[MAX_ADDR_LEN];
1224         unsigned long flags;
1225
1226         LCS_DBF_TEXT(4, trace, "setmclst");
1227         for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1228              im4 = rcu_dereference(im4->next_rcu)) {
1229                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1230                 ipm = lcs_check_addr_entry(card, im4, buf);
1231                 if (ipm != NULL)
1232                         continue;       /* Address already in list. */
1233                 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1234                 if (ipm == NULL) {
1235                         pr_info("Not enough memory to add"
1236                                 " new multicast entry!\n");
1237                         break;
1238                 }
1239                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1240                 ipm->ipm.ip_addr = im4->multiaddr;
1241                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1242                 spin_lock_irqsave(&card->ipm_lock, flags);
1243                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1244                 list_add(&ipm->list, &card->ipm_list);
1245                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1246         }
1247 }
1248
1249 static int
1250 lcs_register_mc_addresses(void *data)
1251 {
1252         struct lcs_card *card;
1253         struct in_device *in4_dev;
1254
1255         card = (struct lcs_card *) data;
1256
1257         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1258                 return 0;
1259         LCS_DBF_TEXT(4, trace, "regmulti");
1260
1261         in4_dev = in_dev_get(card->dev);
1262         if (in4_dev == NULL)
1263                 goto out;
1264         rcu_read_lock();
1265         lcs_remove_mc_addresses(card,in4_dev);
1266         lcs_set_mc_addresses(card, in4_dev);
1267         rcu_read_unlock();
1268         in_dev_put(in4_dev);
1269
1270         netif_carrier_off(card->dev);
1271         netif_tx_disable(card->dev);
1272         wait_event(card->write.wait_q,
1273                         (card->write.state != LCS_CH_STATE_RUNNING));
1274         lcs_fix_multicast_list(card);
1275         if (card->state == DEV_STATE_UP) {
1276                 netif_carrier_on(card->dev);
1277                 netif_wake_queue(card->dev);
1278         }
1279 out:
1280         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1281         return 0;
1282 }
1283 #endif /* CONFIG_IP_MULTICAST */
1284
1285 /**
1286  * function called by net device to
1287  * handle multicast address relevant things
1288  */
1289 static void
1290 lcs_set_multicast_list(struct net_device *dev)
1291 {
1292 #ifdef CONFIG_IP_MULTICAST
1293         struct lcs_card *card;
1294
1295         LCS_DBF_TEXT(4, trace, "setmulti");
1296         card = (struct lcs_card *) dev->ml_priv;
1297
1298         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1299                 schedule_work(&card->kernel_thread_starter);
1300 #endif /* CONFIG_IP_MULTICAST */
1301 }
1302
1303 static long
1304 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1305 {
1306         if (!IS_ERR(irb))
1307                 return 0;
1308
1309         switch (PTR_ERR(irb)) {
1310         case -EIO:
1311                 dev_warn(&cdev->dev,
1312                         "An I/O-error occurred on the LCS device\n");
1313                 LCS_DBF_TEXT(2, trace, "ckirberr");
1314                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1315                 break;
1316         case -ETIMEDOUT:
1317                 dev_warn(&cdev->dev,
1318                         "A command timed out on the LCS device\n");
1319                 LCS_DBF_TEXT(2, trace, "ckirberr");
1320                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1321                 break;
1322         default:
1323                 dev_warn(&cdev->dev,
1324                         "An error occurred on the LCS device, rc=%ld\n",
1325                         PTR_ERR(irb));
1326                 LCS_DBF_TEXT(2, trace, "ckirberr");
1327                 LCS_DBF_TEXT(2, trace, "  rc???");
1328         }
1329         return PTR_ERR(irb);
1330 }
1331
1332 static int
1333 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1334 {
1335         int dstat, cstat;
1336         char *sense;
1337
1338         sense = (char *) irb->ecw;
1339         cstat = irb->scsw.cmd.cstat;
1340         dstat = irb->scsw.cmd.dstat;
1341
1342         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1343                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1344                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1345                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1346                 return 1;
1347         }
1348         if (dstat & DEV_STAT_UNIT_CHECK) {
1349                 if (sense[LCS_SENSE_BYTE_1] &
1350                     LCS_SENSE_RESETTING_EVENT) {
1351                         LCS_DBF_TEXT(2, trace, "REVIND");
1352                         return 1;
1353                 }
1354                 if (sense[LCS_SENSE_BYTE_0] &
1355                     LCS_SENSE_CMD_REJECT) {
1356                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1357                         return 0;
1358                 }
1359                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1360                     (!sense[LCS_SENSE_BYTE_1]) &&
1361                     (!sense[LCS_SENSE_BYTE_2]) &&
1362                     (!sense[LCS_SENSE_BYTE_3])) {
1363                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1364                         return 0;
1365                 }
1366                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1367                 return 1;
1368         }
1369         return 0;
1370 }
1371
1372 static void
1373 lcs_schedule_recovery(struct lcs_card *card)
1374 {
1375         LCS_DBF_TEXT(2, trace, "startrec");
1376         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1377                 schedule_work(&card->kernel_thread_starter);
1378 }
1379
1380 /**
1381  * IRQ Handler for LCS channels
1382  */
1383 static void
1384 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1385 {
1386         struct lcs_card *card;
1387         struct lcs_channel *channel;
1388         int rc, index;
1389         int cstat, dstat;
1390
1391         if (lcs_check_irb_error(cdev, irb))
1392                 return;
1393
1394         card = CARD_FROM_DEV(cdev);
1395         if (card->read.ccwdev == cdev)
1396                 channel = &card->read;
1397         else
1398                 channel = &card->write;
1399
1400         cstat = irb->scsw.cmd.cstat;
1401         dstat = irb->scsw.cmd.dstat;
1402         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1403         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1404                       irb->scsw.cmd.dstat);
1405         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1406                       irb->scsw.cmd.actl);
1407
1408         /* Check for channel and device errors presented */
1409         rc = lcs_get_problem(cdev, irb);
1410         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1411                 dev_warn(&cdev->dev,
1412                         "The LCS device stopped because of an error,"
1413                         " dstat=0x%X, cstat=0x%X \n",
1414                             dstat, cstat);
1415                 if (rc) {
1416                         channel->state = LCS_CH_STATE_ERROR;
1417                 }
1418         }
1419         if (channel->state == LCS_CH_STATE_ERROR) {
1420                 lcs_schedule_recovery(card);
1421                 wake_up(&card->wait_q);
1422                 return;
1423         }
1424         /* How far in the ccw chain have we processed? */
1425         if ((channel->state != LCS_CH_STATE_INIT) &&
1426             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1427             (irb->scsw.cmd.cpa != 0)) {
1428                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1429                         - channel->ccws;
1430                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1431                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1432                         /* Bloody io subsystem tells us lies about cpa... */
1433                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1434                 while (channel->io_idx != index) {
1435                         __lcs_processed_buffer(channel,
1436                                                channel->iob + channel->io_idx);
1437                         channel->io_idx =
1438                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1439                 }
1440         }
1441
1442         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1443             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1444             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1445                 /* Mark channel as stopped. */
1446                 channel->state = LCS_CH_STATE_STOPPED;
1447         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1448                 /* CCW execution stopped on a suspend bit. */
1449                 channel->state = LCS_CH_STATE_SUSPENDED;
1450         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1451                 if (irb->scsw.cmd.cc != 0) {
1452                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1453                         return;
1454                 }
1455                 /* The channel has been stopped by halt_IO. */
1456                 channel->state = LCS_CH_STATE_HALTED;
1457         }
1458         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1459                 channel->state = LCS_CH_STATE_CLEARED;
1460         /* Do the rest in the tasklet. */
1461         tasklet_schedule(&channel->irq_tasklet);
1462 }
1463
1464 /**
1465  * Tasklet for IRQ handler
1466  */
1467 static void
1468 lcs_tasklet(unsigned long data)
1469 {
1470         unsigned long flags;
1471         struct lcs_channel *channel;
1472         struct lcs_buffer *iob;
1473         int buf_idx;
1474
1475         channel = (struct lcs_channel *) data;
1476         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1477
1478         /* Check for processed buffers. */
1479         iob = channel->iob;
1480         buf_idx = channel->buf_idx;
1481         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1482                 /* Do the callback thing. */
1483                 if (iob[buf_idx].callback != NULL)
1484                         iob[buf_idx].callback(channel, iob + buf_idx);
1485                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1486         }
1487         channel->buf_idx = buf_idx;
1488
1489         if (channel->state == LCS_CH_STATE_STOPPED)
1490                 lcs_start_channel(channel);
1491         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1492         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1493             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1494                 __lcs_resume_channel(channel);
1495         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1496
1497         /* Something happened on the channel. Wake up waiters. */
1498         wake_up(&channel->wait_q);
1499 }
1500
1501 /**
1502  * Finish current tx buffer and make it ready for transmit.
1503  */
1504 static void
1505 __lcs_emit_txbuffer(struct lcs_card *card)
1506 {
1507         LCS_DBF_TEXT(5, trace, "emittx");
1508         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1509         card->tx_buffer->count += 2;
1510         lcs_ready_buffer(&card->write, card->tx_buffer);
1511         card->tx_buffer = NULL;
1512         card->tx_emitted++;
1513 }
1514
1515 /**
1516  * Callback for finished tx buffers.
1517  */
1518 static void
1519 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1520 {
1521         struct lcs_card *card;
1522
1523         LCS_DBF_TEXT(5, trace, "txbuffcb");
1524         /* Put buffer back to pool. */
1525         lcs_release_buffer(channel, buffer);
1526         card = container_of(channel, struct lcs_card, write);
1527         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1528                 netif_wake_queue(card->dev);
1529         spin_lock(&card->lock);
1530         card->tx_emitted--;
1531         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1532                 /*
1533                  * Last running tx buffer has finished. Submit partially
1534                  * filled current buffer.
1535                  */
1536                 __lcs_emit_txbuffer(card);
1537         spin_unlock(&card->lock);
1538 }
1539
1540 /**
1541  * Packet transmit function called by network stack
1542  */
1543 static netdev_tx_t __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1544                                     struct net_device *dev)
1545 {
1546         struct lcs_header *header;
1547         int rc = NETDEV_TX_OK;
1548
1549         LCS_DBF_TEXT(5, trace, "hardxmit");
1550         if (skb == NULL) {
1551                 card->stats.tx_dropped++;
1552                 card->stats.tx_errors++;
1553                 return NETDEV_TX_OK;
1554         }
1555         if (card->state != DEV_STATE_UP) {
1556                 dev_kfree_skb(skb);
1557                 card->stats.tx_dropped++;
1558                 card->stats.tx_errors++;
1559                 card->stats.tx_carrier_errors++;
1560                 return NETDEV_TX_OK;
1561         }
1562         if (skb->protocol == htons(ETH_P_IPV6)) {
1563                 dev_kfree_skb(skb);
1564                 return NETDEV_TX_OK;
1565         }
1566         netif_stop_queue(card->dev);
1567         spin_lock(&card->lock);
1568         if (card->tx_buffer != NULL &&
1569             card->tx_buffer->count + sizeof(struct lcs_header) +
1570             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1571                 /* skb too big for current tx buffer. */
1572                 __lcs_emit_txbuffer(card);
1573         if (card->tx_buffer == NULL) {
1574                 /* Get new tx buffer */
1575                 card->tx_buffer = lcs_get_buffer(&card->write);
1576                 if (card->tx_buffer == NULL) {
1577                         card->stats.tx_dropped++;
1578                         rc = NETDEV_TX_BUSY;
1579                         goto out;
1580                 }
1581                 card->tx_buffer->callback = lcs_txbuffer_cb;
1582                 card->tx_buffer->count = 0;
1583         }
1584         header = (struct lcs_header *)
1585                 (card->tx_buffer->data + card->tx_buffer->count);
1586         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1587         header->offset = card->tx_buffer->count;
1588         header->type = card->lan_type;
1589         header->slot = card->portno;
1590         skb_copy_from_linear_data(skb, header + 1, skb->len);
1591         spin_unlock(&card->lock);
1592         card->stats.tx_bytes += skb->len;
1593         card->stats.tx_packets++;
1594         dev_kfree_skb(skb);
1595         netif_wake_queue(card->dev);
1596         spin_lock(&card->lock);
1597         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1598                 /* If this is the first tx buffer emit it immediately. */
1599                 __lcs_emit_txbuffer(card);
1600 out:
1601         spin_unlock(&card->lock);
1602         return rc;
1603 }
1604
1605 static netdev_tx_t lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1606 {
1607         struct lcs_card *card;
1608         int rc;
1609
1610         LCS_DBF_TEXT(5, trace, "pktxmit");
1611         card = (struct lcs_card *) dev->ml_priv;
1612         rc = __lcs_start_xmit(card, skb, dev);
1613         return rc;
1614 }
1615
1616 /**
1617  * send startlan and lanstat command to make LCS device ready
1618  */
1619 static int
1620 lcs_startlan_auto(struct lcs_card *card)
1621 {
1622         int rc;
1623
1624         LCS_DBF_TEXT(2, trace, "strtauto");
1625 #ifdef CONFIG_ETHERNET
1626         card->lan_type = LCS_FRAME_TYPE_ENET;
1627         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1628         if (rc == 0)
1629                 return 0;
1630
1631 #endif
1632 #ifdef CONFIG_FDDI
1633         card->lan_type = LCS_FRAME_TYPE_FDDI;
1634         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1635         if (rc == 0)
1636                 return 0;
1637 #endif
1638         return -EIO;
1639 }
1640
1641 static int
1642 lcs_startlan(struct lcs_card *card)
1643 {
1644         int rc, i;
1645
1646         LCS_DBF_TEXT(2, trace, "startlan");
1647         rc = 0;
1648         if (card->portno != LCS_INVALID_PORT_NO) {
1649                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1650                         rc = lcs_startlan_auto(card);
1651                 else
1652                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1653         } else {
1654                 for (i = 0; i <= 16; i++) {
1655                         card->portno = i;
1656                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1657                                 rc = lcs_send_startlan(card,
1658                                                        LCS_INITIATOR_TCPIP);
1659                         else
1660                                 /* autodetecting lan type */
1661                                 rc = lcs_startlan_auto(card);
1662                         if (rc == 0)
1663                                 break;
1664                 }
1665         }
1666         if (rc == 0)
1667                 return lcs_send_lanstat(card);
1668         return rc;
1669 }
1670
1671 /**
1672  * LCS detect function
1673  * setup channels and make them I/O ready
1674  */
1675 static int
1676 lcs_detect(struct lcs_card *card)
1677 {
1678         int rc = 0;
1679
1680         LCS_DBF_TEXT(2, setup, "lcsdetct");
1681         /* start/reset card */
1682         if (card->dev)
1683                 netif_stop_queue(card->dev);
1684         rc = lcs_stop_channels(card);
1685         if (rc == 0) {
1686                 rc = lcs_start_channels(card);
1687                 if (rc == 0) {
1688                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1689                         if (rc == 0)
1690                                 rc = lcs_startlan(card);
1691                 }
1692         }
1693         if (rc == 0) {
1694                 card->state = DEV_STATE_UP;
1695         } else {
1696                 card->state = DEV_STATE_DOWN;
1697                 card->write.state = LCS_CH_STATE_INIT;
1698                 card->read.state =  LCS_CH_STATE_INIT;
1699         }
1700         return rc;
1701 }
1702
1703 /**
1704  * LCS Stop card
1705  */
1706 static int
1707 lcs_stopcard(struct lcs_card *card)
1708 {
1709         int rc;
1710
1711         LCS_DBF_TEXT(3, setup, "stopcard");
1712
1713         if (card->read.state != LCS_CH_STATE_STOPPED &&
1714             card->write.state != LCS_CH_STATE_STOPPED &&
1715             card->read.state != LCS_CH_STATE_ERROR &&
1716             card->write.state != LCS_CH_STATE_ERROR &&
1717             card->state == DEV_STATE_UP) {
1718                 lcs_clear_multicast_list(card);
1719                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1720                 rc = lcs_send_shutdown(card);
1721         }
1722         rc = lcs_stop_channels(card);
1723         card->state = DEV_STATE_DOWN;
1724
1725         return rc;
1726 }
1727
1728 /**
1729  * Kernel Thread helper functions for LGW initiated commands
1730  */
1731 static void
1732 lcs_start_kernel_thread(struct work_struct *work)
1733 {
1734         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1735         LCS_DBF_TEXT(5, trace, "krnthrd");
1736         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1737                 kthread_run(lcs_recovery, card, "lcs_recover");
1738 #ifdef CONFIG_IP_MULTICAST
1739         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1740                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1741 #endif
1742 }
1743
1744 /**
1745  * Process control frames.
1746  */
1747 static void
1748 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1749 {
1750         LCS_DBF_TEXT(5, trace, "getctrl");
1751         if (cmd->initiator == LCS_INITIATOR_LGW) {
1752                 switch(cmd->cmd_code) {
1753                 case LCS_CMD_STARTUP:
1754                 case LCS_CMD_STARTLAN:
1755                         lcs_schedule_recovery(card);
1756                         break;
1757                 case LCS_CMD_STOPLAN:
1758                         if (card->dev) {
1759                                 pr_warn("Stoplan for %s initiated by LGW\n",
1760                                         card->dev->name);
1761                                 netif_carrier_off(card->dev);
1762                         }
1763                         break;
1764                 default:
1765                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1766                         break;
1767                 }
1768         } else
1769                 lcs_notify_lancmd_waiters(card, cmd);
1770 }
1771
1772 /**
1773  * Unpack network packet.
1774  */
1775 static void
1776 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1777 {
1778         struct sk_buff *skb;
1779
1780         LCS_DBF_TEXT(5, trace, "getskb");
1781         if (card->dev == NULL ||
1782             card->state != DEV_STATE_UP)
1783                 /* The card isn't up. Ignore the packet. */
1784                 return;
1785
1786         skb = dev_alloc_skb(skb_len);
1787         if (skb == NULL) {
1788                 dev_err(&card->dev->dev,
1789                         " Allocating a socket buffer to interface %s failed\n",
1790                           card->dev->name);
1791                 card->stats.rx_dropped++;
1792                 return;
1793         }
1794         skb_put_data(skb, skb_data, skb_len);
1795         skb->protocol = card->lan_type_trans(skb, card->dev);
1796         card->stats.rx_bytes += skb_len;
1797         card->stats.rx_packets++;
1798         if (skb->protocol == htons(ETH_P_802_2))
1799                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1800         netif_rx(skb);
1801 }
1802
1803 /**
1804  * LCS main routine to get packets and lancmd replies from the buffers
1805  */
1806 static void
1807 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1808 {
1809         struct lcs_card *card;
1810         struct lcs_header *lcs_hdr;
1811         __u16 offset;
1812
1813         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1814         lcs_hdr = (struct lcs_header *) buffer->data;
1815         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1816                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1817                 return;
1818         }
1819         card = container_of(channel, struct lcs_card, read);
1820         offset = 0;
1821         while (lcs_hdr->offset != 0) {
1822                 if (lcs_hdr->offset <= 0 ||
1823                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1824                     lcs_hdr->offset < offset) {
1825                         /* Offset invalid. */
1826                         card->stats.rx_length_errors++;
1827                         card->stats.rx_errors++;
1828                         return;
1829                 }
1830                 /* What kind of frame is it? */
1831                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1832                         /* Control frame. */
1833                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1834                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1835                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1836                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1837                         /* Normal network packet. */
1838                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1839                                     lcs_hdr->offset - offset -
1840                                     sizeof(struct lcs_header));
1841                 else
1842                         /* Unknown frame type. */
1843                         ; // FIXME: error message ?
1844                 /* Proceed to next frame. */
1845                 offset = lcs_hdr->offset;
1846                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1847                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1848         }
1849         /* The buffer is now empty. Make it ready again. */
1850         lcs_ready_buffer(&card->read, buffer);
1851 }
1852
1853 /**
1854  * get network statistics for ifconfig and other user programs
1855  */
1856 static struct net_device_stats *
1857 lcs_getstats(struct net_device *dev)
1858 {
1859         struct lcs_card *card;
1860
1861         LCS_DBF_TEXT(4, trace, "netstats");
1862         card = (struct lcs_card *) dev->ml_priv;
1863         return &card->stats;
1864 }
1865
1866 /**
1867  * stop lcs device
1868  * This function will be called by user doing ifconfig xxx down
1869  */
1870 static int
1871 lcs_stop_device(struct net_device *dev)
1872 {
1873         struct lcs_card *card;
1874         int rc;
1875
1876         LCS_DBF_TEXT(2, trace, "stopdev");
1877         card   = (struct lcs_card *) dev->ml_priv;
1878         netif_carrier_off(dev);
1879         netif_tx_disable(dev);
1880         dev->flags &= ~IFF_UP;
1881         wait_event(card->write.wait_q,
1882                 (card->write.state != LCS_CH_STATE_RUNNING));
1883         rc = lcs_stopcard(card);
1884         if (rc)
1885                 dev_err(&card->dev->dev,
1886                         " Shutting down the LCS device failed\n");
1887         return rc;
1888 }
1889
1890 /**
1891  * start lcs device and make it runnable
1892  * This function will be called by user doing ifconfig xxx up
1893  */
1894 static int
1895 lcs_open_device(struct net_device *dev)
1896 {
1897         struct lcs_card *card;
1898         int rc;
1899
1900         LCS_DBF_TEXT(2, trace, "opendev");
1901         card = (struct lcs_card *) dev->ml_priv;
1902         /* initialize statistics */
1903         rc = lcs_detect(card);
1904         if (rc) {
1905                 pr_err("Error in opening device!\n");
1906
1907         } else {
1908                 dev->flags |= IFF_UP;
1909                 netif_carrier_on(dev);
1910                 netif_wake_queue(dev);
1911                 card->state = DEV_STATE_UP;
1912         }
1913         return rc;
1914 }
1915
1916 /**
1917  * show function for portno called by cat or similar things
1918  */
1919 static ssize_t
1920 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1921 {
1922         struct lcs_card *card;
1923
1924         card = dev_get_drvdata(dev);
1925
1926         if (!card)
1927                 return 0;
1928
1929         return sprintf(buf, "%d\n", card->portno);
1930 }
1931
1932 /**
1933  * store the value which is piped to file portno
1934  */
1935 static ssize_t
1936 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1937 {
1938         struct lcs_card *card;
1939         int rc;
1940         s16 value;
1941
1942         card = dev_get_drvdata(dev);
1943
1944         if (!card)
1945                 return 0;
1946
1947         rc = kstrtos16(buf, 0, &value);
1948         if (rc)
1949                 return -EINVAL;
1950         /* TODO: sanity checks */
1951         card->portno = value;
1952
1953         return count;
1954
1955 }
1956
1957 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1958
1959 static const char *lcs_type[] = {
1960         "not a channel",
1961         "2216 parallel",
1962         "2216 channel",
1963         "OSA LCS card",
1964         "unknown channel type",
1965         "unsupported channel type",
1966 };
1967
1968 static ssize_t
1969 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1970 {
1971         struct ccwgroup_device *cgdev;
1972
1973         cgdev = to_ccwgroupdev(dev);
1974         if (!cgdev)
1975                 return -ENODEV;
1976
1977         return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1978 }
1979
1980 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1981
1982 static ssize_t
1983 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1984 {
1985         struct lcs_card *card;
1986
1987         card = dev_get_drvdata(dev);
1988
1989         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1990 }
1991
1992 static ssize_t
1993 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1994 {
1995         struct lcs_card *card;
1996         unsigned int value;
1997         int rc;
1998
1999         card = dev_get_drvdata(dev);
2000
2001         if (!card)
2002                 return 0;
2003
2004         rc = kstrtouint(buf, 0, &value);
2005         if (rc)
2006                 return -EINVAL;
2007         /* TODO: sanity checks */
2008         card->lancmd_timeout = value;
2009
2010         return count;
2011
2012 }
2013
2014 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2015
2016 static ssize_t
2017 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2018                       const char *buf, size_t count)
2019 {
2020         struct lcs_card *card = dev_get_drvdata(dev);
2021         char *tmp;
2022         int i;
2023
2024         if (!card)
2025                 return -EINVAL;
2026         if (card->state != DEV_STATE_UP)
2027                 return -EPERM;
2028         i = simple_strtoul(buf, &tmp, 16);
2029         if (i == 1)
2030                 lcs_schedule_recovery(card);
2031         return count;
2032 }
2033
2034 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2035
2036 static struct attribute * lcs_attrs[] = {
2037         &dev_attr_portno.attr,
2038         &dev_attr_type.attr,
2039         &dev_attr_lancmd_timeout.attr,
2040         &dev_attr_recover.attr,
2041         NULL,
2042 };
2043 static struct attribute_group lcs_attr_group = {
2044         .attrs = lcs_attrs,
2045 };
2046 static const struct attribute_group *lcs_attr_groups[] = {
2047         &lcs_attr_group,
2048         NULL,
2049 };
2050 static const struct device_type lcs_devtype = {
2051         .name = "lcs",
2052         .groups = lcs_attr_groups,
2053 };
2054
2055 /**
2056  * lcs_probe_device is called on establishing a new ccwgroup_device.
2057  */
2058 static int
2059 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2060 {
2061         struct lcs_card *card;
2062
2063         if (!get_device(&ccwgdev->dev))
2064                 return -ENODEV;
2065
2066         LCS_DBF_TEXT(2, setup, "add_dev");
2067         card = lcs_alloc_card();
2068         if (!card) {
2069                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2070                 put_device(&ccwgdev->dev);
2071                 return -ENOMEM;
2072         }
2073         dev_set_drvdata(&ccwgdev->dev, card);
2074         ccwgdev->cdev[0]->handler = lcs_irq;
2075         ccwgdev->cdev[1]->handler = lcs_irq;
2076         card->gdev = ccwgdev;
2077         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2078         card->thread_start_mask = 0;
2079         card->thread_allowed_mask = 0;
2080         card->thread_running_mask = 0;
2081         ccwgdev->dev.type = &lcs_devtype;
2082
2083         return 0;
2084 }
2085
2086 static int
2087 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2088 {
2089         struct lcs_card *card;
2090
2091         LCS_DBF_TEXT(2, setup, "regnetdv");
2092         card = dev_get_drvdata(&ccwgdev->dev);
2093         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2094                 return 0;
2095         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2096         return register_netdev(card->dev);
2097 }
2098
2099 /**
2100  * lcs_new_device will be called by setting the group device online.
2101  */
2102 static const struct net_device_ops lcs_netdev_ops = {
2103         .ndo_open               = lcs_open_device,
2104         .ndo_stop               = lcs_stop_device,
2105         .ndo_get_stats          = lcs_getstats,
2106         .ndo_start_xmit         = lcs_start_xmit,
2107 };
2108
2109 static const struct net_device_ops lcs_mc_netdev_ops = {
2110         .ndo_open               = lcs_open_device,
2111         .ndo_stop               = lcs_stop_device,
2112         .ndo_get_stats          = lcs_getstats,
2113         .ndo_start_xmit         = lcs_start_xmit,
2114         .ndo_set_rx_mode        = lcs_set_multicast_list,
2115 };
2116
2117 static int
2118 lcs_new_device(struct ccwgroup_device *ccwgdev)
2119 {
2120         struct  lcs_card *card;
2121         struct net_device *dev=NULL;
2122         enum lcs_dev_states recover_state;
2123         int rc;
2124
2125         card = dev_get_drvdata(&ccwgdev->dev);
2126         if (!card)
2127                 return -ENODEV;
2128
2129         LCS_DBF_TEXT(2, setup, "newdev");
2130         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2131         card->read.ccwdev  = ccwgdev->cdev[0];
2132         card->write.ccwdev = ccwgdev->cdev[1];
2133
2134         recover_state = card->state;
2135         rc = ccw_device_set_online(card->read.ccwdev);
2136         if (rc)
2137                 goto out_err;
2138         rc = ccw_device_set_online(card->write.ccwdev);
2139         if (rc)
2140                 goto out_werr;
2141
2142         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2143
2144         lcs_setup_card(card);
2145         rc = lcs_detect(card);
2146         if (rc) {
2147                 LCS_DBF_TEXT(2, setup, "dtctfail");
2148                 dev_err(&ccwgdev->dev,
2149                         "Detecting a network adapter for LCS devices"
2150                         " failed with rc=%d (0x%x)\n", rc, rc);
2151                 lcs_stopcard(card);
2152                 goto out;
2153         }
2154         if (card->dev) {
2155                 LCS_DBF_TEXT(2, setup, "samedev");
2156                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2157                 goto netdev_out;
2158         }
2159         switch (card->lan_type) {
2160 #ifdef CONFIG_ETHERNET
2161         case LCS_FRAME_TYPE_ENET:
2162                 card->lan_type_trans = eth_type_trans;
2163                 dev = alloc_etherdev(0);
2164                 break;
2165 #endif
2166 #ifdef CONFIG_FDDI
2167         case LCS_FRAME_TYPE_FDDI:
2168                 card->lan_type_trans = fddi_type_trans;
2169                 dev = alloc_fddidev(0);
2170                 break;
2171 #endif
2172         default:
2173                 LCS_DBF_TEXT(3, setup, "errinit");
2174                 pr_err(" Initialization failed\n");
2175                 goto out;
2176         }
2177         if (!dev)
2178                 goto out;
2179         card->dev = dev;
2180         card->dev->ml_priv = card;
2181         card->dev->netdev_ops = &lcs_netdev_ops;
2182         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2183 #ifdef CONFIG_IP_MULTICAST
2184         if (!lcs_check_multicast_support(card))
2185                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2186 #endif
2187 netdev_out:
2188         lcs_set_allowed_threads(card,0xffffffff);
2189         if (recover_state == DEV_STATE_RECOVER) {
2190                 lcs_set_multicast_list(card->dev);
2191                 card->dev->flags |= IFF_UP;
2192                 netif_carrier_on(card->dev);
2193                 netif_wake_queue(card->dev);
2194                 card->state = DEV_STATE_UP;
2195         } else {
2196                 lcs_stopcard(card);
2197         }
2198
2199         if (lcs_register_netdev(ccwgdev) != 0)
2200                 goto out;
2201
2202         /* Print out supported assists: IPv6 */
2203         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2204                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2205                 "with" : "without");
2206         /* Print out supported assist: Multicast */
2207         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2208                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2209                 "with" : "without");
2210         return 0;
2211 out:
2212
2213         ccw_device_set_offline(card->write.ccwdev);
2214 out_werr:
2215         ccw_device_set_offline(card->read.ccwdev);
2216 out_err:
2217         return -ENODEV;
2218 }
2219
2220 /**
2221  * lcs_shutdown_device, called when setting the group device offline.
2222  */
2223 static int
2224 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2225 {
2226         struct lcs_card *card;
2227         enum lcs_dev_states recover_state;
2228         int ret = 0, ret2 = 0, ret3 = 0;
2229
2230         LCS_DBF_TEXT(3, setup, "shtdndev");
2231         card = dev_get_drvdata(&ccwgdev->dev);
2232         if (!card)
2233                 return -ENODEV;
2234         if (recovery_mode == 0) {
2235                 lcs_set_allowed_threads(card, 0);
2236                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2237                         return -ERESTARTSYS;
2238         }
2239         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2240         recover_state = card->state;
2241
2242         ret = lcs_stop_device(card->dev);
2243         ret2 = ccw_device_set_offline(card->read.ccwdev);
2244         ret3 = ccw_device_set_offline(card->write.ccwdev);
2245         if (!ret)
2246                 ret = (ret2) ? ret2 : ret3;
2247         if (ret)
2248                 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2249         if (recover_state == DEV_STATE_UP) {
2250                 card->state = DEV_STATE_RECOVER;
2251         }
2252         return 0;
2253 }
2254
2255 static int
2256 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2257 {
2258         return __lcs_shutdown_device(ccwgdev, 0);
2259 }
2260
2261 /**
2262  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2263  */
2264 static int
2265 lcs_recovery(void *ptr)
2266 {
2267         struct lcs_card *card;
2268         struct ccwgroup_device *gdev;
2269         int rc;
2270
2271         card = (struct lcs_card *) ptr;
2272
2273         LCS_DBF_TEXT(4, trace, "recover1");
2274         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2275                 return 0;
2276         LCS_DBF_TEXT(4, trace, "recover2");
2277         gdev = card->gdev;
2278         dev_warn(&gdev->dev,
2279                 "A recovery process has been started for the LCS device\n");
2280         rc = __lcs_shutdown_device(gdev, 1);
2281         rc = lcs_new_device(gdev);
2282         if (!rc)
2283                 pr_info("Device %s successfully recovered!\n",
2284                         card->dev->name);
2285         else
2286                 pr_info("Device %s could not be recovered!\n",
2287                         card->dev->name);
2288         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2289         return 0;
2290 }
2291
2292 /**
2293  * lcs_remove_device, free buffers and card
2294  */
2295 static void
2296 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2297 {
2298         struct lcs_card *card;
2299
2300         card = dev_get_drvdata(&ccwgdev->dev);
2301         if (!card)
2302                 return;
2303
2304         LCS_DBF_TEXT(3, setup, "remdev");
2305         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2306         if (ccwgdev->state == CCWGROUP_ONLINE) {
2307                 lcs_shutdown_device(ccwgdev);
2308         }
2309         if (card->dev)
2310                 unregister_netdev(card->dev);
2311         lcs_cleanup_card(card);
2312         lcs_free_card(card);
2313         dev_set_drvdata(&ccwgdev->dev, NULL);
2314         put_device(&ccwgdev->dev);
2315 }
2316
2317 static int lcs_pm_suspend(struct lcs_card *card)
2318 {
2319         if (card->dev)
2320                 netif_device_detach(card->dev);
2321         lcs_set_allowed_threads(card, 0);
2322         lcs_wait_for_threads(card, 0xffffffff);
2323         if (card->state != DEV_STATE_DOWN)
2324                 __lcs_shutdown_device(card->gdev, 1);
2325         return 0;
2326 }
2327
2328 static int lcs_pm_resume(struct lcs_card *card)
2329 {
2330         int rc = 0;
2331
2332         if (card->state == DEV_STATE_RECOVER)
2333                 rc = lcs_new_device(card->gdev);
2334         if (card->dev)
2335                 netif_device_attach(card->dev);
2336         if (rc) {
2337                 dev_warn(&card->gdev->dev, "The lcs device driver "
2338                         "failed to recover the device\n");
2339         }
2340         return rc;
2341 }
2342
2343 static int lcs_prepare(struct ccwgroup_device *gdev)
2344 {
2345         return 0;
2346 }
2347
2348 static void lcs_complete(struct ccwgroup_device *gdev)
2349 {
2350         return;
2351 }
2352
2353 static int lcs_freeze(struct ccwgroup_device *gdev)
2354 {
2355         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2356         return lcs_pm_suspend(card);
2357 }
2358
2359 static int lcs_thaw(struct ccwgroup_device *gdev)
2360 {
2361         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2362         return lcs_pm_resume(card);
2363 }
2364
2365 static int lcs_restore(struct ccwgroup_device *gdev)
2366 {
2367         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2368         return lcs_pm_resume(card);
2369 }
2370
2371 static struct ccw_device_id lcs_ids[] = {
2372         {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2373         {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2374         {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2375         {},
2376 };
2377 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2378
2379 static struct ccw_driver lcs_ccw_driver = {
2380         .driver = {
2381                 .owner  = THIS_MODULE,
2382                 .name   = "lcs",
2383         },
2384         .ids    = lcs_ids,
2385         .probe  = ccwgroup_probe_ccwdev,
2386         .remove = ccwgroup_remove_ccwdev,
2387         .int_class = IRQIO_LCS,
2388 };
2389
2390 /**
2391  * LCS ccwgroup driver registration
2392  */
2393 static struct ccwgroup_driver lcs_group_driver = {
2394         .driver = {
2395                 .owner  = THIS_MODULE,
2396                 .name   = "lcs",
2397         },
2398         .setup       = lcs_probe_device,
2399         .remove      = lcs_remove_device,
2400         .set_online  = lcs_new_device,
2401         .set_offline = lcs_shutdown_device,
2402         .prepare     = lcs_prepare,
2403         .complete    = lcs_complete,
2404         .freeze      = lcs_freeze,
2405         .thaw        = lcs_thaw,
2406         .restore     = lcs_restore,
2407 };
2408
2409 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
2410                            size_t count)
2411 {
2412         int err;
2413         err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2414         return err ? err : count;
2415 }
2416 static DRIVER_ATTR_WO(group);
2417
2418 static struct attribute *lcs_drv_attrs[] = {
2419         &driver_attr_group.attr,
2420         NULL,
2421 };
2422 static struct attribute_group lcs_drv_attr_group = {
2423         .attrs = lcs_drv_attrs,
2424 };
2425 static const struct attribute_group *lcs_drv_attr_groups[] = {
2426         &lcs_drv_attr_group,
2427         NULL,
2428 };
2429
2430 /**
2431  *  LCS Module/Kernel initialization function
2432  */
2433 static int
2434 __init lcs_init_module(void)
2435 {
2436         int rc;
2437
2438         pr_info("Loading %s\n", version);
2439         rc = lcs_register_debug_facility();
2440         LCS_DBF_TEXT(0, setup, "lcsinit");
2441         if (rc)
2442                 goto out_err;
2443         lcs_root_dev = root_device_register("lcs");
2444         rc = PTR_ERR_OR_ZERO(lcs_root_dev);
2445         if (rc)
2446                 goto register_err;
2447         rc = ccw_driver_register(&lcs_ccw_driver);
2448         if (rc)
2449                 goto ccw_err;
2450         lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2451         rc = ccwgroup_driver_register(&lcs_group_driver);
2452         if (rc)
2453                 goto ccwgroup_err;
2454         return 0;
2455
2456 ccwgroup_err:
2457         ccw_driver_unregister(&lcs_ccw_driver);
2458 ccw_err:
2459         root_device_unregister(lcs_root_dev);
2460 register_err:
2461         lcs_unregister_debug_facility();
2462 out_err:
2463         pr_err("Initializing the lcs device driver failed\n");
2464         return rc;
2465 }
2466
2467
2468 /**
2469  *  LCS module cleanup function
2470  */
2471 static void
2472 __exit lcs_cleanup_module(void)
2473 {
2474         pr_info("Terminating lcs module.\n");
2475         LCS_DBF_TEXT(0, trace, "cleanup");
2476         ccwgroup_driver_unregister(&lcs_group_driver);
2477         ccw_driver_unregister(&lcs_ccw_driver);
2478         root_device_unregister(lcs_root_dev);
2479         lcs_unregister_debug_facility();
2480 }
2481
2482 module_init(lcs_init_module);
2483 module_exit(lcs_cleanup_module);
2484
2485 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2486 MODULE_LICENSE("GPL");
2487