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         if (lcs_dbf_setup)
  92                 debug_unregister(lcs_dbf_setup);
  93         if (lcs_dbf_trace)
  94                 debug_unregister(lcs_dbf_trace);
  95 }
  96
  97 static int
  98 lcs_register_debug_facility(void)
  99 {
 100         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
 101         lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
 102         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
 103                 pr_err("Not enough memory for debug facility.\n");
 104                 lcs_unregister_debug_facility();
 105                 return -ENOMEM;
 106         }
 107         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 108         debug_set_level(lcs_dbf_setup, 2);
 109         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 110         debug_set_level(lcs_dbf_trace, 2);
 111         return 0;
 112 }
 113
 114 /**
 115  * Allocate io buffers.
 116  */
 117 static int
 118 lcs_alloc_channel(struct lcs_channel *channel)
 119 {
 120         int cnt;
 121
 122         LCS_DBF_TEXT(2, setup, "ichalloc");
 123         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 124                 /* alloc memory fo iobuffer */
 125                 channel->iob[cnt].data =
 126                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 127                 if (channel->iob[cnt].data == NULL)
 128                         break;
 129                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
 130         }
 131         if (cnt < LCS_NUM_BUFFS) {
 132                 /* Not all io buffers could be allocated. */
 133                 LCS_DBF_TEXT(2, setup, "echalloc");
 134                 while (cnt-- > 0)
 135                         kfree(channel->iob[cnt].data);
 136                 return -ENOMEM;
 137         }
 138         return 0;
 139 }
 140
 141 /**
 142  * Free io buffers.
 143  */
 144 static void
 145 lcs_free_channel(struct lcs_channel *channel)
 146 {
 147         int cnt;
 148
 149         LCS_DBF_TEXT(2, setup, "ichfree");
 150         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 151                 kfree(channel->iob[cnt].data);
 152                 channel->iob[cnt].data = NULL;
 153         }
 154 }
 155
 156 /*
 157  * Cleanup channel.
 158  */
 159 static void
 160 lcs_cleanup_channel(struct lcs_channel *channel)
 161 {
 162         LCS_DBF_TEXT(3, setup, "cleanch");
 163         /* Kill write channel tasklets. */
 164         tasklet_kill(&channel->irq_tasklet);
 165         /* Free channel buffers. */
 166         lcs_free_channel(channel);
 167 }
 168
 169 /**
 170  * LCS free memory for card and channels.
 171  */
 172 static void
 173 lcs_free_card(struct lcs_card *card)
 174 {
 175         LCS_DBF_TEXT(2, setup, "remcard");
 176         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 177         kfree(card);
 178 }
 179
 180 /**
 181  * LCS alloc memory for card and channels
 182  */
 183 static struct lcs_card *
 184 lcs_alloc_card(void)
 185 {
 186         struct lcs_card *card;
 187         int rc;
 188
 189         LCS_DBF_TEXT(2, setup, "alloclcs");
 190
 191         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 192         if (card == NULL)
 193                 return NULL;
 194         card->lan_type = LCS_FRAME_TYPE_AUTO;
 195         card->pkt_seq = 0;
 196         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 197         /* Allocate io buffers for the read channel. */
 198         rc = lcs_alloc_channel(&card->read);
 199         if (rc){
 200                 LCS_DBF_TEXT(2, setup, "iccwerr");
 201                 lcs_free_card(card);
 202                 return NULL;
 203         }
 204         /* Allocate io buffers for the write channel. */
 205         rc = lcs_alloc_channel(&card->write);
 206         if (rc) {
 207                 LCS_DBF_TEXT(2, setup, "iccwerr");
 208                 lcs_cleanup_channel(&card->read);
 209                 lcs_free_card(card);
 210                 return NULL;
 211         }
 212
 213 #ifdef CONFIG_IP_MULTICAST
 214         INIT_LIST_HEAD(&card->ipm_list);
 215 #endif
 216         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 217         return card;
 218 }
 219
 220 /*
 221  * Setup read channel.
 222  */
 223 static void
 224 lcs_setup_read_ccws(struct lcs_card *card)
 225 {
 226         int cnt;
 227
 228         LCS_DBF_TEXT(2, setup, "ireadccw");
 229         /* Setup read ccws. */
 230         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 231         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 232                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 233                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 234                 card->read.ccws[cnt].flags =
 235                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 236                 /*
 237                  * Note: we have allocated the buffer with GFP_DMA, so
 238                  * we do not need to do set_normalized_cda.
 239                  */
 240                 card->read.ccws[cnt].cda =
 241                         (__u32) __pa(card->read.iob[cnt].data);
 242                 ((struct lcs_header *)
 243                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 244                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 245                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
 246                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 247         }
 248         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 249         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 250         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 251         /* Last ccw is a tic (transfer in channel). */
 252         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 253         card->read.ccws[LCS_NUM_BUFFS].cda =
 254                 (__u32) __pa(card->read.ccws);
 255         /* Setg initial state of the read channel. */
 256         card->read.state = LCS_CH_STATE_INIT;
 257
 258         card->read.io_idx = 0;
 259         card->read.buf_idx = 0;
 260 }
 261
 262 static void
 263 lcs_setup_read(struct lcs_card *card)
 264 {
 265         LCS_DBF_TEXT(3, setup, "initread");
 266
 267         lcs_setup_read_ccws(card);
 268         /* Initialize read channel tasklet. */
 269         card->read.irq_tasklet.data = (unsigned long) &card->read;
 270         card->read.irq_tasklet.func = lcs_tasklet;
 271         /* Initialize waitqueue. */
 272         init_waitqueue_head(&card->read.wait_q);
 273 }
 274
 275 /*
 276  * Setup write channel.
 277  */
 278 static void
 279 lcs_setup_write_ccws(struct lcs_card *card)
 280 {
 281         int cnt;
 282
 283         LCS_DBF_TEXT(3, setup, "iwritccw");
 284         /* Setup write ccws. */
 285         memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
 286         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 287                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 288                 card->write.ccws[cnt].count = 0;
 289                 card->write.ccws[cnt].flags =
 290                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 291                 /*
 292                  * Note: we have allocated the buffer with GFP_DMA, so
 293                  * we do not need to do set_normalized_cda.
 294                  */
 295                 card->write.ccws[cnt].cda =
 296                         (__u32) __pa(card->write.iob[cnt].data);
 297         }
 298         /* Last ccw is a tic (transfer in channel). */
 299         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 300         card->write.ccws[LCS_NUM_BUFFS].cda =
 301                 (__u32) __pa(card->write.ccws);
 302         /* Set initial state of the write channel. */
 303         card->read.state = LCS_CH_STATE_INIT;
 304
 305         card->write.io_idx = 0;
 306         card->write.buf_idx = 0;
 307 }
 308
 309 static void
 310 lcs_setup_write(struct lcs_card *card)
 311 {
 312         LCS_DBF_TEXT(3, setup, "initwrit");
 313
 314         lcs_setup_write_ccws(card);
 315         /* Initialize write channel tasklet. */
 316         card->write.irq_tasklet.data = (unsigned long) &card->write;
 317         card->write.irq_tasklet.func = lcs_tasklet;
 318         /* Initialize waitqueue. */
 319         init_waitqueue_head(&card->write.wait_q);
 320 }
 321
 322 static void
 323 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 324 {
 325         unsigned long flags;
 326
 327         spin_lock_irqsave(&card->mask_lock, flags);
 328         card->thread_allowed_mask = threads;
 329         spin_unlock_irqrestore(&card->mask_lock, flags);
 330         wake_up(&card->wait_q);
 331 }
 332 static inline int
 333 lcs_threads_running(struct lcs_card *card, unsigned long threads)
 334 {
 335         unsigned long flags;
 336         int rc = 0;
 337
 338         spin_lock_irqsave(&card->mask_lock, flags);
 339         rc = (card->thread_running_mask & threads);
 340         spin_unlock_irqrestore(&card->mask_lock, flags);
 341         return rc;
 342 }
 343
 344 static int
 345 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 346 {
 347         return wait_event_interruptible(card->wait_q,
 348                         lcs_threads_running(card, threads) == 0);
 349 }
 350
 351 static inline int
 352 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 353 {
 354         unsigned long flags;
 355
 356         spin_lock_irqsave(&card->mask_lock, flags);
 357         if ( !(card->thread_allowed_mask & thread) ||
 358               (card->thread_start_mask & thread) ) {
 359                 spin_unlock_irqrestore(&card->mask_lock, flags);
 360                 return -EPERM;
 361         }
 362         card->thread_start_mask |= thread;
 363         spin_unlock_irqrestore(&card->mask_lock, flags);
 364         return 0;
 365 }
 366
 367 static void
 368 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 369 {
 370         unsigned long flags;
 371
 372         spin_lock_irqsave(&card->mask_lock, flags);
 373         card->thread_running_mask &= ~thread;
 374         spin_unlock_irqrestore(&card->mask_lock, flags);
 375         wake_up(&card->wait_q);
 376 }
 377
 378 static inline int
 379 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 380 {
 381         unsigned long flags;
 382         int rc = 0;
 383
 384         spin_lock_irqsave(&card->mask_lock, flags);
 385         if (card->thread_start_mask & thread){
 386                 if ((card->thread_allowed_mask & thread) &&
 387                     !(card->thread_running_mask & thread)){
 388                         rc = 1;
 389                         card->thread_start_mask &= ~thread;
 390                         card->thread_running_mask |= thread;
 391                 } else
 392                         rc = -EPERM;
 393         }
 394         spin_unlock_irqrestore(&card->mask_lock, flags);
 395         return rc;
 396 }
 397
 398 static int
 399 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 400 {
 401         int rc = 0;
 402         wait_event(card->wait_q,
 403                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 404         return rc;
 405 }
 406
 407 static int
 408 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 409 {
 410         unsigned long flags;
 411         int rc = 0;
 412
 413         spin_lock_irqsave(&card->mask_lock, flags);
 414         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 415                         (u8) card->thread_start_mask,
 416                         (u8) card->thread_allowed_mask,
 417                         (u8) card->thread_running_mask);
 418         rc = (card->thread_start_mask & thread);
 419         spin_unlock_irqrestore(&card->mask_lock, flags);
 420         return rc;
 421 }
 422
 423 /**
 424  * Initialize channels,card and state machines.
 425  */
 426 static void
 427 lcs_setup_card(struct lcs_card *card)
 428 {
 429         LCS_DBF_TEXT(2, setup, "initcard");
 430         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 431
 432         lcs_setup_read(card);
 433         lcs_setup_write(card);
 434         /* Set cards initial state. */
 435         card->state = DEV_STATE_DOWN;
 436         card->tx_buffer = NULL;
 437         card->tx_emitted = 0;
 438
 439         init_waitqueue_head(&card->wait_q);
 440         spin_lock_init(&card->lock);
 441         spin_lock_init(&card->ipm_lock);
 442         spin_lock_init(&card->mask_lock);
 443 #ifdef CONFIG_IP_MULTICAST
 444         INIT_LIST_HEAD(&card->ipm_list);
 445 #endif
 446         INIT_LIST_HEAD(&card->lancmd_waiters);
 447 }
 448
 449 static inline void
 450 lcs_clear_multicast_list(struct lcs_card *card)
 451 {
 452 #ifdef  CONFIG_IP_MULTICAST
 453         struct lcs_ipm_list *ipm;
 454         unsigned long flags;
 455
 456         /* Free multicast list. */
 457         LCS_DBF_TEXT(3, setup, "clmclist");
 458         spin_lock_irqsave(&card->ipm_lock, flags);
 459         while (!list_empty(&card->ipm_list)){
 460                 ipm = list_entry(card->ipm_list.next,
 461                                  struct lcs_ipm_list, list);
 462                 list_del(&ipm->list);
 463                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 464                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 465                         lcs_send_delipm(card, ipm);
 466                         spin_lock_irqsave(&card->ipm_lock, flags);
 467                 }
 468                 kfree(ipm);
 469         }
 470         spin_unlock_irqrestore(&card->ipm_lock, flags);
 471 #endif
 472 }
 473 /**
 474  * Cleanup channels,card and state machines.
 475  */
 476 static void
 477 lcs_cleanup_card(struct lcs_card *card)
 478 {
 479
 480         LCS_DBF_TEXT(3, setup, "cleancrd");
 481         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 482
 483         if (card->dev != NULL)
 484                 free_netdev(card->dev);
 485         /* Cleanup channels. */
 486         lcs_cleanup_channel(&card->write);
 487         lcs_cleanup_channel(&card->read);
 488 }
 489
 490 /**
 491  * Start channel.
 492  */
 493 static int
 494 lcs_start_channel(struct lcs_channel *channel)
 495 {
 496         unsigned long flags;
 497         int rc;
 498
 499         LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
 500         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 501         rc = ccw_device_start(channel->ccwdev,
 502                               channel->ccws + channel->io_idx, 0, 0,
 503                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 504         if (rc == 0)
 505                 channel->state = LCS_CH_STATE_RUNNING;
 506         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 507         if (rc) {
 508                 LCS_DBF_TEXT_(4,trace,"essh%s",
 509                               dev_name(&channel->ccwdev->dev));
 510                 dev_err(&channel->ccwdev->dev,
 511                         "Starting an LCS device resulted in an error,"
 512                         " rc=%d!\n", rc);
 513         }
 514         return rc;
 515 }
 516
 517 static int
 518 lcs_clear_channel(struct lcs_channel *channel)
 519 {
 520         unsigned long flags;
 521         int rc;
 522
 523         LCS_DBF_TEXT(4,trace,"clearch");
 524         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 525         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 526         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 527         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 528         if (rc) {
 529                 LCS_DBF_TEXT_(4, trace, "ecsc%s",
 530                               dev_name(&channel->ccwdev->dev));
 531                 return rc;
 532         }
 533         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
 534         channel->state = LCS_CH_STATE_STOPPED;
 535         return rc;
 536 }
 537
 538
 539 /**
 540  * Stop channel.
 541  */
 542 static int
 543 lcs_stop_channel(struct lcs_channel *channel)
 544 {
 545         unsigned long flags;
 546         int rc;
 547
 548         if (channel->state == LCS_CH_STATE_STOPPED)
 549                 return 0;
 550         LCS_DBF_TEXT(4,trace,"haltsch");
 551         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 552         channel->state = LCS_CH_STATE_INIT;
 553         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 554         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 555         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 556         if (rc) {
 557                 LCS_DBF_TEXT_(4, trace, "ehsc%s",
 558                               dev_name(&channel->ccwdev->dev));
 559                 return rc;
 560         }
 561         /* Asynchronous halt initialted. Wait for its completion. */
 562         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
 563         lcs_clear_channel(channel);
 564         return 0;
 565 }
 566
 567 /**
 568  * start read and write channel
 569  */
 570 static int
 571 lcs_start_channels(struct lcs_card *card)
 572 {
 573         int rc;
 574
 575         LCS_DBF_TEXT(2, trace, "chstart");
 576         /* start read channel */
 577         rc = lcs_start_channel(&card->read);
 578         if (rc)
 579                 return rc;
 580         /* start write channel */
 581         rc = lcs_start_channel(&card->write);
 582         if (rc)
 583                 lcs_stop_channel(&card->read);
 584         return rc;
 585 }
 586
 587 /**
 588  * stop read and write channel
 589  */
 590 static int
 591 lcs_stop_channels(struct lcs_card *card)
 592 {
 593         LCS_DBF_TEXT(2, trace, "chhalt");
 594         lcs_stop_channel(&card->read);
 595         lcs_stop_channel(&card->write);
 596         return 0;
 597 }
 598
 599 /**
 600  * Get empty buffer.
 601  */
 602 static struct lcs_buffer *
 603 __lcs_get_buffer(struct lcs_channel *channel)
 604 {
 605         int index;
 606
 607         LCS_DBF_TEXT(5, trace, "_getbuff");
 608         index = channel->io_idx;
 609         do {
 610                 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
 611                         channel->iob[index].state = LCS_BUF_STATE_LOCKED;
 612                         return channel->iob + index;
 613                 }
 614                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 615         } while (index != channel->io_idx);
 616         return NULL;
 617 }
 618
 619 static struct lcs_buffer *
 620 lcs_get_buffer(struct lcs_channel *channel)
 621 {
 622         struct lcs_buffer *buffer;
 623         unsigned long flags;
 624
 625         LCS_DBF_TEXT(5, trace, "getbuff");
 626         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 627         buffer = __lcs_get_buffer(channel);
 628         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 629         return buffer;
 630 }
 631
 632 /**
 633  * Resume channel program if the channel is suspended.
 634  */
 635 static int
 636 __lcs_resume_channel(struct lcs_channel *channel)
 637 {
 638         int rc;
 639
 640         if (channel->state != LCS_CH_STATE_SUSPENDED)
 641                 return 0;
 642         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 643                 return 0;
 644         LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
 645         rc = ccw_device_resume(channel->ccwdev);
 646         if (rc) {
 647                 LCS_DBF_TEXT_(4, trace, "ersc%s",
 648                               dev_name(&channel->ccwdev->dev));
 649                 dev_err(&channel->ccwdev->dev,
 650                         "Sending data from the LCS device to the LAN failed"
 651                         " with rc=%d\n",rc);
 652         } else
 653                 channel->state = LCS_CH_STATE_RUNNING;
 654         return rc;
 655
 656 }
 657
 658 /**
 659  * Make a buffer ready for processing.
 660  */
 661 static inline void
 662 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 663 {
 664         int prev, next;
 665
 666         LCS_DBF_TEXT(5, trace, "rdybits");
 667         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 668         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 669         /* Check if we may clear the suspend bit of this buffer. */
 670         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 671                 /* Check if we have to set the PCI bit. */
 672                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 673                         /* Suspend bit of the previous buffer is not set. */
 674                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 675                 /* Suspend bit of the next buffer is set. */
 676                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 677         }
 678 }
 679
 680 static int
 681 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 682 {
 683         unsigned long flags;
 684         int index, rc;
 685
 686         LCS_DBF_TEXT(5, trace, "rdybuff");
 687         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 688                buffer->state != LCS_BUF_STATE_PROCESSED);
 689         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 690         buffer->state = LCS_BUF_STATE_READY;
 691         index = buffer - channel->iob;
 692         /* Set length. */
 693         channel->ccws[index].count = buffer->count;
 694         /* Check relevant PCI/suspend bits. */
 695         __lcs_ready_buffer_bits(channel, index);
 696         rc = __lcs_resume_channel(channel);
 697         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 698         return rc;
 699 }
 700
 701 /**
 702  * Mark the buffer as processed. Take care of the suspend bit
 703  * of the previous buffer. This function is called from
 704  * interrupt context, so the lock must not be taken.
 705  */
 706 static int
 707 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 708 {
 709         int index, prev, next;
 710
 711         LCS_DBF_TEXT(5, trace, "prcsbuff");
 712         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
 713         buffer->state = LCS_BUF_STATE_PROCESSED;
 714         index = buffer - channel->iob;
 715         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 716         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 717         /* Set the suspend bit and clear the PCI bit of this buffer. */
 718         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 719         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 720         /* Check the suspend bit of the previous buffer. */
 721         if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
 722                 /*
 723                  * Previous buffer is in state ready. It might have
 724                  * happened in lcs_ready_buffer that the suspend bit
 725                  * has not been cleared to avoid an endless loop.
 726                  * Do it now.
 727                  */
 728                 __lcs_ready_buffer_bits(channel, prev);
 729         }
 730         /* Clear PCI bit of next buffer. */
 731         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 732         return __lcs_resume_channel(channel);
 733 }
 734
 735 /**
 736  * Put a processed buffer back to state empty.
 737  */
 738 static void
 739 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 740 {
 741         unsigned long flags;
 742
 743         LCS_DBF_TEXT(5, trace, "relbuff");
 744         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 745                buffer->state != LCS_BUF_STATE_PROCESSED);
 746         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 747         buffer->state = LCS_BUF_STATE_EMPTY;
 748         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 749 }
 750
 751 /**
 752  * Get buffer for a lan command.
 753  */
 754 static struct lcs_buffer *
 755 lcs_get_lancmd(struct lcs_card *card, int count)
 756 {
 757         struct lcs_buffer *buffer;
 758         struct lcs_cmd *cmd;
 759
 760         LCS_DBF_TEXT(4, trace, "getlncmd");
 761         /* Get buffer and wait if none is available. */
 762         wait_event(card->write.wait_q,
 763                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 764         count += sizeof(struct lcs_header);
 765         *(__u16 *)(buffer->data + count) = 0;
 766         buffer->count = count + sizeof(__u16);
 767         buffer->callback = lcs_release_buffer;
 768         cmd = (struct lcs_cmd *) buffer->data;
 769         cmd->offset = count;
 770         cmd->type = LCS_FRAME_TYPE_CONTROL;
 771         cmd->slot = 0;
 772         return buffer;
 773 }
 774
 775
 776 static void
 777 lcs_get_reply(struct lcs_reply *reply)
 778 {
 779         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 780         atomic_inc(&reply->refcnt);
 781 }
 782
 783 static void
 784 lcs_put_reply(struct lcs_reply *reply)
 785 {
 786         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 787         if (atomic_dec_and_test(&reply->refcnt)) {
 788                 kfree(reply);
 789         }
 790
 791 }
 792
 793 static struct lcs_reply *
 794 lcs_alloc_reply(struct lcs_cmd *cmd)
 795 {
 796         struct lcs_reply *reply;
 797
 798         LCS_DBF_TEXT(4, trace, "getreply");
 799
 800         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 801         if (!reply)
 802                 return NULL;
 803         atomic_set(&reply->refcnt,1);
 804         reply->sequence_no = cmd->sequence_no;
 805         reply->received = 0;
 806         reply->rc = 0;
 807         init_waitqueue_head(&reply->wait_q);
 808
 809         return reply;
 810 }
 811
 812 /**
 813  * Notifier function for lancmd replies. Called from read irq.
 814  */
 815 static void
 816 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 817 {
 818         struct list_head *l, *n;
 819         struct lcs_reply *reply;
 820
 821         LCS_DBF_TEXT(4, trace, "notiwait");
 822         spin_lock(&card->lock);
 823         list_for_each_safe(l, n, &card->lancmd_waiters) {
 824                 reply = list_entry(l, struct lcs_reply, list);
 825                 if (reply->sequence_no == cmd->sequence_no) {
 826                         lcs_get_reply(reply);
 827                         list_del_init(&reply->list);
 828                         if (reply->callback != NULL)
 829                                 reply->callback(card, cmd);
 830                         reply->received = 1;
 831                         reply->rc = cmd->return_code;
 832                         wake_up(&reply->wait_q);
 833                         lcs_put_reply(reply);
 834                         break;
 835                 }
 836         }
 837         spin_unlock(&card->lock);
 838 }
 839
 840 /**
 841  * Emit buffer of a lan command.
 842  */
 843 static void
 844 lcs_lancmd_timeout(unsigned long data)
 845 {
 846         struct lcs_reply *reply, *list_reply, *r;
 847         unsigned long flags;
 848
 849         LCS_DBF_TEXT(4, trace, "timeout");
 850         reply = (struct lcs_reply *) data;
 851         spin_lock_irqsave(&reply->card->lock, flags);
 852         list_for_each_entry_safe(list_reply, r,
 853                                  &reply->card->lancmd_waiters,list) {
 854                 if (reply == list_reply) {
 855                         lcs_get_reply(reply);
 856                         list_del_init(&reply->list);
 857                         spin_unlock_irqrestore(&reply->card->lock, flags);
 858                         reply->received = 1;
 859                         reply->rc = -ETIME;
 860                         wake_up(&reply->wait_q);
 861                         lcs_put_reply(reply);
 862                         return;
 863                 }
 864         }
 865         spin_unlock_irqrestore(&reply->card->lock, flags);
 866 }
 867
 868 static int
 869 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 870                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 871 {
 872         struct lcs_reply *reply;
 873         struct lcs_cmd *cmd;
 874         struct timer_list timer;
 875         unsigned long flags;
 876         int rc;
 877
 878         LCS_DBF_TEXT(4, trace, "sendcmd");
 879         cmd = (struct lcs_cmd *) buffer->data;
 880         cmd->return_code = 0;
 881         cmd->sequence_no = card->sequence_no++;
 882         reply = lcs_alloc_reply(cmd);
 883         if (!reply)
 884                 return -ENOMEM;
 885         reply->callback = reply_callback;
 886         reply->card = card;
 887         spin_lock_irqsave(&card->lock, flags);
 888         list_add_tail(&reply->list, &card->lancmd_waiters);
 889         spin_unlock_irqrestore(&card->lock, flags);
 890
 891         buffer->callback = lcs_release_buffer;
 892         rc = lcs_ready_buffer(&card->write, buffer);
 893         if (rc)
 894                 return rc;
 895         init_timer_on_stack(&timer);
 896         timer.function = lcs_lancmd_timeout;
 897         timer.data = (unsigned long) reply;
 898         timer.expires = jiffies + HZ*card->lancmd_timeout;
 899         add_timer(&timer);
 900         wait_event(reply->wait_q, reply->received);
 901         del_timer_sync(&timer);
 902         destroy_timer_on_stack(&timer);
 903         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 904         rc = reply->rc;
 905         lcs_put_reply(reply);
 906         return rc ? -EIO : 0;
 907 }
 908
 909 /**
 910  * LCS startup command
 911  */
 912 static int
 913 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 914 {
 915         struct lcs_buffer *buffer;
 916         struct lcs_cmd *cmd;
 917
 918         LCS_DBF_TEXT(2, trace, "startup");
 919         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 920         cmd = (struct lcs_cmd *) buffer->data;
 921         cmd->cmd_code = LCS_CMD_STARTUP;
 922         cmd->initiator = initiator;
 923         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 924         return lcs_send_lancmd(card, buffer, NULL);
 925 }
 926
 927 /**
 928  * LCS shutdown command
 929  */
 930 static int
 931 lcs_send_shutdown(struct lcs_card *card)
 932 {
 933         struct lcs_buffer *buffer;
 934         struct lcs_cmd *cmd;
 935
 936         LCS_DBF_TEXT(2, trace, "shutdown");
 937         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 938         cmd = (struct lcs_cmd *) buffer->data;
 939         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 940         cmd->initiator = LCS_INITIATOR_TCPIP;
 941         return lcs_send_lancmd(card, buffer, NULL);
 942 }
 943
 944 /**
 945  * LCS lanstat command
 946  */
 947 static void
 948 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 949 {
 950         LCS_DBF_TEXT(2, trace, "statcb");
 951         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 952 }
 953
 954 static int
 955 lcs_send_lanstat(struct lcs_card *card)
 956 {
 957         struct lcs_buffer *buffer;
 958         struct lcs_cmd *cmd;
 959
 960         LCS_DBF_TEXT(2,trace, "cmdstat");
 961         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 962         cmd = (struct lcs_cmd *) buffer->data;
 963         /* Setup lanstat command. */
 964         cmd->cmd_code = LCS_CMD_LANSTAT;
 965         cmd->initiator = LCS_INITIATOR_TCPIP;
 966         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 967         cmd->cmd.lcs_std_cmd.portno = card->portno;
 968         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 969 }
 970
 971 /**
 972  * send stoplan command
 973  */
 974 static int
 975 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 976 {
 977         struct lcs_buffer *buffer;
 978         struct lcs_cmd *cmd;
 979
 980         LCS_DBF_TEXT(2, trace, "cmdstpln");
 981         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 982         cmd = (struct lcs_cmd *) buffer->data;
 983         cmd->cmd_code = LCS_CMD_STOPLAN;
 984         cmd->initiator = initiator;
 985         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 986         cmd->cmd.lcs_std_cmd.portno = card->portno;
 987         return lcs_send_lancmd(card, buffer, NULL);
 988 }
 989
 990 /**
 991  * send startlan command
 992  */
 993 static void
 994 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 995 {
 996         LCS_DBF_TEXT(2, trace, "srtlancb");
 997         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 998         card->portno = cmd->cmd.lcs_std_cmd.portno;
 999 }
1000
1001 static int
1002 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1003 {
1004         struct lcs_buffer *buffer;
1005         struct lcs_cmd *cmd;
1006
1007         LCS_DBF_TEXT(2, trace, "cmdstaln");
1008         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1009         cmd = (struct lcs_cmd *) buffer->data;
1010         cmd->cmd_code = LCS_CMD_STARTLAN;
1011         cmd->initiator = initiator;
1012         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1013         cmd->cmd.lcs_std_cmd.portno = card->portno;
1014         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1015 }
1016
1017 #ifdef CONFIG_IP_MULTICAST
1018 /**
1019  * send setipm command (Multicast)
1020  */
1021 static int
1022 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1023 {
1024         struct lcs_buffer *buffer;
1025         struct lcs_cmd *cmd;
1026
1027         LCS_DBF_TEXT(2, trace, "cmdsetim");
1028         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1029         cmd = (struct lcs_cmd *) buffer->data;
1030         cmd->cmd_code = LCS_CMD_SETIPM;
1031         cmd->initiator = LCS_INITIATOR_TCPIP;
1032         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1033         cmd->cmd.lcs_qipassist.portno = card->portno;
1034         cmd->cmd.lcs_qipassist.version = 4;
1035         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1036         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1037                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1038         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1039         return lcs_send_lancmd(card, buffer, NULL);
1040 }
1041
1042 /**
1043  * send delipm command (Multicast)
1044  */
1045 static int
1046 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1047 {
1048         struct lcs_buffer *buffer;
1049         struct lcs_cmd *cmd;
1050
1051         LCS_DBF_TEXT(2, trace, "cmddelim");
1052         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1053         cmd = (struct lcs_cmd *) buffer->data;
1054         cmd->cmd_code = LCS_CMD_DELIPM;
1055         cmd->initiator = LCS_INITIATOR_TCPIP;
1056         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1057         cmd->cmd.lcs_qipassist.portno = card->portno;
1058         cmd->cmd.lcs_qipassist.version = 4;
1059         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1060         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1061                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1062         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1063         return lcs_send_lancmd(card, buffer, NULL);
1064 }
1065
1066 /**
1067  * check if multicast is supported by LCS
1068  */
1069 static void
1070 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1071 {
1072         LCS_DBF_TEXT(2, trace, "chkmccb");
1073         card->ip_assists_supported =
1074                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1075         card->ip_assists_enabled =
1076                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1077 }
1078
1079 static int
1080 lcs_check_multicast_support(struct lcs_card *card)
1081 {
1082         struct lcs_buffer *buffer;
1083         struct lcs_cmd *cmd;
1084         int rc;
1085
1086         LCS_DBF_TEXT(2, trace, "cmdqipa");
1087         /* Send query ipassist. */
1088         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1089         cmd = (struct lcs_cmd *) buffer->data;
1090         cmd->cmd_code = LCS_CMD_QIPASSIST;
1091         cmd->initiator = LCS_INITIATOR_TCPIP;
1092         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1093         cmd->cmd.lcs_qipassist.portno = card->portno;
1094         cmd->cmd.lcs_qipassist.version = 4;
1095         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1096         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1097         if (rc != 0) {
1098                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1099                 return -EOPNOTSUPP;
1100         }
1101         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1102                 return 0;
1103         return -EOPNOTSUPP;
1104 }
1105
1106 /**
1107  * set or del multicast address on LCS card
1108  */
1109 static void
1110 lcs_fix_multicast_list(struct lcs_card *card)
1111 {
1112         struct list_head failed_list;
1113         struct lcs_ipm_list *ipm, *tmp;
1114         unsigned long flags;
1115         int rc;
1116
1117         LCS_DBF_TEXT(4,trace, "fixipm");
1118         INIT_LIST_HEAD(&failed_list);
1119         spin_lock_irqsave(&card->ipm_lock, flags);
1120 list_modified:
1121         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1122                 switch (ipm->ipm_state) {
1123                 case LCS_IPM_STATE_SET_REQUIRED:
1124                         /* del from ipm_list so no one else can tamper with
1125                          * this entry */
1126                         list_del_init(&ipm->list);
1127                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1128                         rc = lcs_send_setipm(card, ipm);
1129                         spin_lock_irqsave(&card->ipm_lock, flags);
1130                         if (rc) {
1131                                 pr_info("Adding multicast address failed."
1132                                         " Table possibly full!\n");
1133                                 /* store ipm in failed list -> will be added
1134                                  * to ipm_list again, so a retry will be done
1135                                  * during the next call of this function */
1136                                 list_add_tail(&ipm->list, &failed_list);
1137                         } else {
1138                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1139                                 /* re-insert into ipm_list */
1140                                 list_add_tail(&ipm->list, &card->ipm_list);
1141                         }
1142                         goto list_modified;
1143                 case LCS_IPM_STATE_DEL_REQUIRED:
1144                         list_del(&ipm->list);
1145                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1146                         lcs_send_delipm(card, ipm);
1147                         spin_lock_irqsave(&card->ipm_lock, flags);
1148                         kfree(ipm);
1149                         goto list_modified;
1150                 case LCS_IPM_STATE_ON_CARD:
1151                         break;
1152                 }
1153         }
1154         /* re-insert all entries from the failed_list into ipm_list */
1155         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1156                 list_move_tail(&ipm->list, &card->ipm_list);
1157
1158         spin_unlock_irqrestore(&card->ipm_lock, flags);
1159 }
1160
1161 /**
1162  * get mac address for the relevant Multicast address
1163  */
1164 static void
1165 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1166 {
1167         LCS_DBF_TEXT(4,trace, "getmac");
1168         ip_eth_mc_map(ipm, mac);
1169 }
1170
1171 /**
1172  * function called by net device to handle multicast address relevant things
1173  */
1174 static inline void
1175 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1176 {
1177         struct ip_mc_list *im4;
1178         struct list_head *l;
1179         struct lcs_ipm_list *ipm;
1180         unsigned long flags;
1181         char buf[MAX_ADDR_LEN];
1182
1183         LCS_DBF_TEXT(4, trace, "remmclst");
1184         spin_lock_irqsave(&card->ipm_lock, flags);
1185         list_for_each(l, &card->ipm_list) {
1186                 ipm = list_entry(l, struct lcs_ipm_list, list);
1187                 for (im4 = rcu_dereference(in4_dev->mc_list);
1188                      im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1189                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1190                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1191                              (memcmp(buf, &ipm->ipm.mac_addr,
1192                                      LCS_MAC_LENGTH) == 0) )
1193                                 break;
1194                 }
1195                 if (im4 == NULL)
1196                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1197         }
1198         spin_unlock_irqrestore(&card->ipm_lock, flags);
1199 }
1200
1201 static inline struct lcs_ipm_list *
1202 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1203 {
1204         struct lcs_ipm_list *tmp, *ipm = NULL;
1205         struct list_head *l;
1206         unsigned long flags;
1207
1208         LCS_DBF_TEXT(4, trace, "chkmcent");
1209         spin_lock_irqsave(&card->ipm_lock, flags);
1210         list_for_each(l, &card->ipm_list) {
1211                 tmp = list_entry(l, struct lcs_ipm_list, list);
1212                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1213                      (memcmp(buf, &tmp->ipm.mac_addr,
1214                              LCS_MAC_LENGTH) == 0) ) {
1215                         ipm = tmp;
1216                         break;
1217                 }
1218         }
1219         spin_unlock_irqrestore(&card->ipm_lock, flags);
1220         return ipm;
1221 }
1222
1223 static inline void
1224 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1225 {
1226
1227         struct ip_mc_list *im4;
1228         struct lcs_ipm_list *ipm;
1229         char buf[MAX_ADDR_LEN];
1230         unsigned long flags;
1231
1232         LCS_DBF_TEXT(4, trace, "setmclst");
1233         for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1234              im4 = rcu_dereference(im4->next_rcu)) {
1235                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1236                 ipm = lcs_check_addr_entry(card, im4, buf);
1237                 if (ipm != NULL)
1238                         continue;       /* Address already in list. */
1239                 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1240                 if (ipm == NULL) {
1241                         pr_info("Not enough memory to add"
1242                                 " new multicast entry!\n");
1243                         break;
1244                 }
1245                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1246                 ipm->ipm.ip_addr = im4->multiaddr;
1247                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1248                 spin_lock_irqsave(&card->ipm_lock, flags);
1249                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1250                 list_add(&ipm->list, &card->ipm_list);
1251                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1252         }
1253 }
1254
1255 static int
1256 lcs_register_mc_addresses(void *data)
1257 {
1258         struct lcs_card *card;
1259         struct in_device *in4_dev;
1260
1261         card = (struct lcs_card *) data;
1262
1263         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1264                 return 0;
1265         LCS_DBF_TEXT(4, trace, "regmulti");
1266
1267         in4_dev = in_dev_get(card->dev);
1268         if (in4_dev == NULL)
1269                 goto out;
1270         rcu_read_lock();
1271         lcs_remove_mc_addresses(card,in4_dev);
1272         lcs_set_mc_addresses(card, in4_dev);
1273         rcu_read_unlock();
1274         in_dev_put(in4_dev);
1275
1276         netif_carrier_off(card->dev);
1277         netif_tx_disable(card->dev);
1278         wait_event(card->write.wait_q,
1279                         (card->write.state != LCS_CH_STATE_RUNNING));
1280         lcs_fix_multicast_list(card);
1281         if (card->state == DEV_STATE_UP) {
1282                 netif_carrier_on(card->dev);
1283                 netif_wake_queue(card->dev);
1284         }
1285 out:
1286         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1287         return 0;
1288 }
1289 #endif /* CONFIG_IP_MULTICAST */
1290
1291 /**
1292  * function called by net device to
1293  * handle multicast address relevant things
1294  */
1295 static void
1296 lcs_set_multicast_list(struct net_device *dev)
1297 {
1298 #ifdef CONFIG_IP_MULTICAST
1299         struct lcs_card *card;
1300
1301         LCS_DBF_TEXT(4, trace, "setmulti");
1302         card = (struct lcs_card *) dev->ml_priv;
1303
1304         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1305                 schedule_work(&card->kernel_thread_starter);
1306 #endif /* CONFIG_IP_MULTICAST */
1307 }
1308
1309 static long
1310 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1311 {
1312         if (!IS_ERR(irb))
1313                 return 0;
1314
1315         switch (PTR_ERR(irb)) {
1316         case -EIO:
1317                 dev_warn(&cdev->dev,
1318                         "An I/O-error occurred on the LCS device\n");
1319                 LCS_DBF_TEXT(2, trace, "ckirberr");
1320                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1321                 break;
1322         case -ETIMEDOUT:
1323                 dev_warn(&cdev->dev,
1324                         "A command timed out on the LCS device\n");
1325                 LCS_DBF_TEXT(2, trace, "ckirberr");
1326                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1327                 break;
1328         default:
1329                 dev_warn(&cdev->dev,
1330                         "An error occurred on the LCS device, rc=%ld\n",
1331                         PTR_ERR(irb));
1332                 LCS_DBF_TEXT(2, trace, "ckirberr");
1333                 LCS_DBF_TEXT(2, trace, "  rc???");
1334         }
1335         return PTR_ERR(irb);
1336 }
1337
1338 static int
1339 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1340 {
1341         int dstat, cstat;
1342         char *sense;
1343
1344         sense = (char *) irb->ecw;
1345         cstat = irb->scsw.cmd.cstat;
1346         dstat = irb->scsw.cmd.dstat;
1347
1348         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1349                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1350                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1351                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1352                 return 1;
1353         }
1354         if (dstat & DEV_STAT_UNIT_CHECK) {
1355                 if (sense[LCS_SENSE_BYTE_1] &
1356                     LCS_SENSE_RESETTING_EVENT) {
1357                         LCS_DBF_TEXT(2, trace, "REVIND");
1358                         return 1;
1359                 }
1360                 if (sense[LCS_SENSE_BYTE_0] &
1361                     LCS_SENSE_CMD_REJECT) {
1362                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1363                         return 0;
1364                 }
1365                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1366                     (!sense[LCS_SENSE_BYTE_1]) &&
1367                     (!sense[LCS_SENSE_BYTE_2]) &&
1368                     (!sense[LCS_SENSE_BYTE_3])) {
1369                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1370                         return 0;
1371                 }
1372                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1373                 return 1;
1374         }
1375         return 0;
1376 }
1377
1378 static void
1379 lcs_schedule_recovery(struct lcs_card *card)
1380 {
1381         LCS_DBF_TEXT(2, trace, "startrec");
1382         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1383                 schedule_work(&card->kernel_thread_starter);
1384 }
1385
1386 /**
1387  * IRQ Handler for LCS channels
1388  */
1389 static void
1390 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1391 {
1392         struct lcs_card *card;
1393         struct lcs_channel *channel;
1394         int rc, index;
1395         int cstat, dstat;
1396
1397         if (lcs_check_irb_error(cdev, irb))
1398                 return;
1399
1400         card = CARD_FROM_DEV(cdev);
1401         if (card->read.ccwdev == cdev)
1402                 channel = &card->read;
1403         else
1404                 channel = &card->write;
1405
1406         cstat = irb->scsw.cmd.cstat;
1407         dstat = irb->scsw.cmd.dstat;
1408         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1409         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1410                       irb->scsw.cmd.dstat);
1411         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1412                       irb->scsw.cmd.actl);
1413
1414         /* Check for channel and device errors presented */
1415         rc = lcs_get_problem(cdev, irb);
1416         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1417                 dev_warn(&cdev->dev,
1418                         "The LCS device stopped because of an error,"
1419                         " dstat=0x%X, cstat=0x%X \n",
1420                             dstat, cstat);
1421                 if (rc) {
1422                         channel->state = LCS_CH_STATE_ERROR;
1423                 }
1424         }
1425         if (channel->state == LCS_CH_STATE_ERROR) {
1426                 lcs_schedule_recovery(card);
1427                 wake_up(&card->wait_q);
1428                 return;
1429         }
1430         /* How far in the ccw chain have we processed? */
1431         if ((channel->state != LCS_CH_STATE_INIT) &&
1432             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1433             (irb->scsw.cmd.cpa != 0)) {
1434                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1435                         - channel->ccws;
1436                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1437                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1438                         /* Bloody io subsystem tells us lies about cpa... */
1439                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1440                 while (channel->io_idx != index) {
1441                         __lcs_processed_buffer(channel,
1442                                                channel->iob + channel->io_idx);
1443                         channel->io_idx =
1444                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1445                 }
1446         }
1447
1448         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1449             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1450             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1451                 /* Mark channel as stopped. */
1452                 channel->state = LCS_CH_STATE_STOPPED;
1453         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1454                 /* CCW execution stopped on a suspend bit. */
1455                 channel->state = LCS_CH_STATE_SUSPENDED;
1456         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1457                 if (irb->scsw.cmd.cc != 0) {
1458                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1459                         return;
1460                 }
1461                 /* The channel has been stopped by halt_IO. */
1462                 channel->state = LCS_CH_STATE_HALTED;
1463         }
1464         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1465                 channel->state = LCS_CH_STATE_CLEARED;
1466         /* Do the rest in the tasklet. */
1467         tasklet_schedule(&channel->irq_tasklet);
1468 }
1469
1470 /**
1471  * Tasklet for IRQ handler
1472  */
1473 static void
1474 lcs_tasklet(unsigned long data)
1475 {
1476         unsigned long flags;
1477         struct lcs_channel *channel;
1478         struct lcs_buffer *iob;
1479         int buf_idx;
1480
1481         channel = (struct lcs_channel *) data;
1482         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1483
1484         /* Check for processed buffers. */
1485         iob = channel->iob;
1486         buf_idx = channel->buf_idx;
1487         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1488                 /* Do the callback thing. */
1489                 if (iob[buf_idx].callback != NULL)
1490                         iob[buf_idx].callback(channel, iob + buf_idx);
1491                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1492         }
1493         channel->buf_idx = buf_idx;
1494
1495         if (channel->state == LCS_CH_STATE_STOPPED)
1496                 lcs_start_channel(channel);
1497         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1498         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1499             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1500                 __lcs_resume_channel(channel);
1501         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1502
1503         /* Something happened on the channel. Wake up waiters. */
1504         wake_up(&channel->wait_q);
1505 }
1506
1507 /**
1508  * Finish current tx buffer and make it ready for transmit.
1509  */
1510 static void
1511 __lcs_emit_txbuffer(struct lcs_card *card)
1512 {
1513         LCS_DBF_TEXT(5, trace, "emittx");
1514         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1515         card->tx_buffer->count += 2;
1516         lcs_ready_buffer(&card->write, card->tx_buffer);
1517         card->tx_buffer = NULL;
1518         card->tx_emitted++;
1519 }
1520
1521 /**
1522  * Callback for finished tx buffers.
1523  */
1524 static void
1525 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1526 {
1527         struct lcs_card *card;
1528
1529         LCS_DBF_TEXT(5, trace, "txbuffcb");
1530         /* Put buffer back to pool. */
1531         lcs_release_buffer(channel, buffer);
1532         card = container_of(channel, struct lcs_card, write);
1533         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1534                 netif_wake_queue(card->dev);
1535         spin_lock(&card->lock);
1536         card->tx_emitted--;
1537         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1538                 /*
1539                  * Last running tx buffer has finished. Submit partially
1540                  * filled current buffer.
1541                  */
1542                 __lcs_emit_txbuffer(card);
1543         spin_unlock(&card->lock);
1544 }
1545
1546 /**
1547  * Packet transmit function called by network stack
1548  */
1549 static int
1550 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1551                  struct net_device *dev)
1552 {
1553         struct lcs_header *header;
1554         int rc = NETDEV_TX_OK;
1555
1556         LCS_DBF_TEXT(5, trace, "hardxmit");
1557         if (skb == NULL) {
1558                 card->stats.tx_dropped++;
1559                 card->stats.tx_errors++;
1560                 return NETDEV_TX_OK;
1561         }
1562         if (card->state != DEV_STATE_UP) {
1563                 dev_kfree_skb(skb);
1564                 card->stats.tx_dropped++;
1565                 card->stats.tx_errors++;
1566                 card->stats.tx_carrier_errors++;
1567                 return NETDEV_TX_OK;
1568         }
1569         if (skb->protocol == htons(ETH_P_IPV6)) {
1570                 dev_kfree_skb(skb);
1571                 return NETDEV_TX_OK;
1572         }
1573         netif_stop_queue(card->dev);
1574         spin_lock(&card->lock);
1575         if (card->tx_buffer != NULL &&
1576             card->tx_buffer->count + sizeof(struct lcs_header) +
1577             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1578                 /* skb too big for current tx buffer. */
1579                 __lcs_emit_txbuffer(card);
1580         if (card->tx_buffer == NULL) {
1581                 /* Get new tx buffer */
1582                 card->tx_buffer = lcs_get_buffer(&card->write);
1583                 if (card->tx_buffer == NULL) {
1584                         card->stats.tx_dropped++;
1585                         rc = NETDEV_TX_BUSY;
1586                         goto out;
1587                 }
1588                 card->tx_buffer->callback = lcs_txbuffer_cb;
1589                 card->tx_buffer->count = 0;
1590         }
1591         header = (struct lcs_header *)
1592                 (card->tx_buffer->data + card->tx_buffer->count);
1593         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1594         header->offset = card->tx_buffer->count;
1595         header->type = card->lan_type;
1596         header->slot = card->portno;
1597         skb_copy_from_linear_data(skb, header + 1, skb->len);
1598         spin_unlock(&card->lock);
1599         card->stats.tx_bytes += skb->len;
1600         card->stats.tx_packets++;
1601         dev_kfree_skb(skb);
1602         netif_wake_queue(card->dev);
1603         spin_lock(&card->lock);
1604         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1605                 /* If this is the first tx buffer emit it immediately. */
1606                 __lcs_emit_txbuffer(card);
1607 out:
1608         spin_unlock(&card->lock);
1609         return rc;
1610 }
1611
1612 static int
1613 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1614 {
1615         struct lcs_card *card;
1616         int rc;
1617
1618         LCS_DBF_TEXT(5, trace, "pktxmit");
1619         card = (struct lcs_card *) dev->ml_priv;
1620         rc = __lcs_start_xmit(card, skb, dev);
1621         return rc;
1622 }
1623
1624 /**
1625  * send startlan and lanstat command to make LCS device ready
1626  */
1627 static int
1628 lcs_startlan_auto(struct lcs_card *card)
1629 {
1630         int rc;
1631
1632         LCS_DBF_TEXT(2, trace, "strtauto");
1633 #ifdef CONFIG_ETHERNET
1634         card->lan_type = LCS_FRAME_TYPE_ENET;
1635         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1636         if (rc == 0)
1637                 return 0;
1638
1639 #endif
1640 #ifdef CONFIG_FDDI
1641         card->lan_type = LCS_FRAME_TYPE_FDDI;
1642         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1643         if (rc == 0)
1644                 return 0;
1645 #endif
1646         return -EIO;
1647 }
1648
1649 static int
1650 lcs_startlan(struct lcs_card *card)
1651 {
1652         int rc, i;
1653
1654         LCS_DBF_TEXT(2, trace, "startlan");
1655         rc = 0;
1656         if (card->portno != LCS_INVALID_PORT_NO) {
1657                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1658                         rc = lcs_startlan_auto(card);
1659                 else
1660                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1661         } else {
1662                 for (i = 0; i <= 16; i++) {
1663                         card->portno = i;
1664                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1665                                 rc = lcs_send_startlan(card,
1666                                                        LCS_INITIATOR_TCPIP);
1667                         else
1668                                 /* autodetecting lan type */
1669                                 rc = lcs_startlan_auto(card);
1670                         if (rc == 0)
1671                                 break;
1672                 }
1673         }
1674         if (rc == 0)
1675                 return lcs_send_lanstat(card);
1676         return rc;
1677 }
1678
1679 /**
1680  * LCS detect function
1681  * setup channels and make them I/O ready
1682  */
1683 static int
1684 lcs_detect(struct lcs_card *card)
1685 {
1686         int rc = 0;
1687
1688         LCS_DBF_TEXT(2, setup, "lcsdetct");
1689         /* start/reset card */
1690         if (card->dev)
1691                 netif_stop_queue(card->dev);
1692         rc = lcs_stop_channels(card);
1693         if (rc == 0) {
1694                 rc = lcs_start_channels(card);
1695                 if (rc == 0) {
1696                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1697                         if (rc == 0)
1698                                 rc = lcs_startlan(card);
1699                 }
1700         }
1701         if (rc == 0) {
1702                 card->state = DEV_STATE_UP;
1703         } else {
1704                 card->state = DEV_STATE_DOWN;
1705                 card->write.state = LCS_CH_STATE_INIT;
1706                 card->read.state =  LCS_CH_STATE_INIT;
1707         }
1708         return rc;
1709 }
1710
1711 /**
1712  * LCS Stop card
1713  */
1714 static int
1715 lcs_stopcard(struct lcs_card *card)
1716 {
1717         int rc;
1718
1719         LCS_DBF_TEXT(3, setup, "stopcard");
1720
1721         if (card->read.state != LCS_CH_STATE_STOPPED &&
1722             card->write.state != LCS_CH_STATE_STOPPED &&
1723             card->read.state != LCS_CH_STATE_ERROR &&
1724             card->write.state != LCS_CH_STATE_ERROR &&
1725             card->state == DEV_STATE_UP) {
1726                 lcs_clear_multicast_list(card);
1727                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1728                 rc = lcs_send_shutdown(card);
1729         }
1730         rc = lcs_stop_channels(card);
1731         card->state = DEV_STATE_DOWN;
1732
1733         return rc;
1734 }
1735
1736 /**
1737  * Kernel Thread helper functions for LGW initiated commands
1738  */
1739 static void
1740 lcs_start_kernel_thread(struct work_struct *work)
1741 {
1742         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1743         LCS_DBF_TEXT(5, trace, "krnthrd");
1744         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1745                 kthread_run(lcs_recovery, card, "lcs_recover");
1746 #ifdef CONFIG_IP_MULTICAST
1747         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1748                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1749 #endif
1750 }
1751
1752 /**
1753  * Process control frames.
1754  */
1755 static void
1756 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1757 {
1758         LCS_DBF_TEXT(5, trace, "getctrl");
1759         if (cmd->initiator == LCS_INITIATOR_LGW) {
1760                 switch(cmd->cmd_code) {
1761                 case LCS_CMD_STARTUP:
1762                 case LCS_CMD_STARTLAN:
1763                         lcs_schedule_recovery(card);
1764                         break;
1765                 case LCS_CMD_STOPLAN:
1766                         pr_warning("Stoplan for %s initiated by LGW.\n",
1767                                    card->dev->name);
1768                         if (card->dev)
1769                                 netif_carrier_off(card->dev);
1770                         break;
1771                 default:
1772                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1773                         break;
1774                 }
1775         } else
1776                 lcs_notify_lancmd_waiters(card, cmd);
1777 }
1778
1779 /**
1780  * Unpack network packet.
1781  */
1782 static void
1783 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1784 {
1785         struct sk_buff *skb;
1786
1787         LCS_DBF_TEXT(5, trace, "getskb");
1788         if (card->dev == NULL ||
1789             card->state != DEV_STATE_UP)
1790                 /* The card isn't up. Ignore the packet. */
1791                 return;
1792
1793         skb = dev_alloc_skb(skb_len);
1794         if (skb == NULL) {
1795                 dev_err(&card->dev->dev,
1796                         " Allocating a socket buffer to interface %s failed\n",
1797                           card->dev->name);
1798                 card->stats.rx_dropped++;
1799                 return;
1800         }
1801         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1802         skb->protocol = card->lan_type_trans(skb, card->dev);
1803         card->stats.rx_bytes += skb_len;
1804         card->stats.rx_packets++;
1805         if (skb->protocol == htons(ETH_P_802_2))
1806                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1807         netif_rx(skb);
1808 }
1809
1810 /**
1811  * LCS main routine to get packets and lancmd replies from the buffers
1812  */
1813 static void
1814 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1815 {
1816         struct lcs_card *card;
1817         struct lcs_header *lcs_hdr;
1818         __u16 offset;
1819
1820         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1821         lcs_hdr = (struct lcs_header *) buffer->data;
1822         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1823                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1824                 return;
1825         }
1826         card = container_of(channel, struct lcs_card, read);
1827         offset = 0;
1828         while (lcs_hdr->offset != 0) {
1829                 if (lcs_hdr->offset <= 0 ||
1830                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1831                     lcs_hdr->offset < offset) {
1832                         /* Offset invalid. */
1833                         card->stats.rx_length_errors++;
1834                         card->stats.rx_errors++;
1835                         return;
1836                 }
1837                 /* What kind of frame is it? */
1838                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1839                         /* Control frame. */
1840                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1841                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1842                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1843                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1844                         /* Normal network packet. */
1845                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1846                                     lcs_hdr->offset - offset -
1847                                     sizeof(struct lcs_header));
1848                 else
1849                         /* Unknown frame type. */
1850                         ; // FIXME: error message ?
1851                 /* Proceed to next frame. */
1852                 offset = lcs_hdr->offset;
1853                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1854                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1855         }
1856         /* The buffer is now empty. Make it ready again. */
1857         lcs_ready_buffer(&card->read, buffer);
1858 }
1859
1860 /**
1861  * get network statistics for ifconfig and other user programs
1862  */
1863 static struct net_device_stats *
1864 lcs_getstats(struct net_device *dev)
1865 {
1866         struct lcs_card *card;
1867
1868         LCS_DBF_TEXT(4, trace, "netstats");
1869         card = (struct lcs_card *) dev->ml_priv;
1870         return &card->stats;
1871 }
1872
1873 /**
1874  * stop lcs device
1875  * This function will be called by user doing ifconfig xxx down
1876  */
1877 static int
1878 lcs_stop_device(struct net_device *dev)
1879 {
1880         struct lcs_card *card;
1881         int rc;
1882
1883         LCS_DBF_TEXT(2, trace, "stopdev");
1884         card   = (struct lcs_card *) dev->ml_priv;
1885         netif_carrier_off(dev);
1886         netif_tx_disable(dev);
1887         dev->flags &= ~IFF_UP;
1888         wait_event(card->write.wait_q,
1889                 (card->write.state != LCS_CH_STATE_RUNNING));
1890         rc = lcs_stopcard(card);
1891         if (rc)
1892                 dev_err(&card->dev->dev,
1893                         " Shutting down the LCS device failed\n ");
1894         return rc;
1895 }
1896
1897 /**
1898  * start lcs device and make it runnable
1899  * This function will be called by user doing ifconfig xxx up
1900  */
1901 static int
1902 lcs_open_device(struct net_device *dev)
1903 {
1904         struct lcs_card *card;
1905         int rc;
1906
1907         LCS_DBF_TEXT(2, trace, "opendev");
1908         card = (struct lcs_card *) dev->ml_priv;
1909         /* initialize statistics */
1910         rc = lcs_detect(card);
1911         if (rc) {
1912                 pr_err("Error in opening device!\n");
1913
1914         } else {
1915                 dev->flags |= IFF_UP;
1916                 netif_carrier_on(dev);
1917                 netif_wake_queue(dev);
1918                 card->state = DEV_STATE_UP;
1919         }
1920         return rc;
1921 }
1922
1923 /**
1924  * show function for portno called by cat or similar things
1925  */
1926 static ssize_t
1927 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1928 {
1929         struct lcs_card *card;
1930
1931         card = dev_get_drvdata(dev);
1932
1933         if (!card)
1934                 return 0;
1935
1936         return sprintf(buf, "%d\n", card->portno);
1937 }
1938
1939 /**
1940  * store the value which is piped to file portno
1941  */
1942 static ssize_t
1943 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1944 {
1945         struct lcs_card *card;
1946         int value, rc;
1947
1948         card = dev_get_drvdata(dev);
1949
1950         if (!card)
1951                 return 0;
1952
1953         rc = sscanf(buf, "%d", &value);
1954         if (rc != 1)
1955                 return -EINVAL;
1956         /* TODO: sanity checks */
1957         card->portno = value;
1958
1959         return count;
1960
1961 }
1962
1963 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1964
1965 static const char *lcs_type[] = {
1966         "not a channel",
1967         "2216 parallel",
1968         "2216 channel",
1969         "OSA LCS card",
1970         "unknown channel type",
1971         "unsupported channel type",
1972 };
1973
1974 static ssize_t
1975 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1976 {
1977         struct ccwgroup_device *cgdev;
1978
1979         cgdev = to_ccwgroupdev(dev);
1980         if (!cgdev)
1981                 return -ENODEV;
1982
1983         return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1984 }
1985
1986 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1987
1988 static ssize_t
1989 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1990 {
1991         struct lcs_card *card;
1992
1993         card = dev_get_drvdata(dev);
1994
1995         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1996 }
1997
1998 static ssize_t
1999 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2000 {
2001         struct lcs_card *card;
2002         unsigned int value;
2003         int rc;
2004
2005         card = dev_get_drvdata(dev);
2006
2007         if (!card)
2008                 return 0;
2009
2010         rc = sscanf(buf, "%u", &value);
2011         if (rc != 1)
2012                 return -EINVAL;
2013         /* TODO: sanity checks */
2014         card->lancmd_timeout = value;
2015
2016         return count;
2017
2018 }
2019
2020 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2021
2022 static ssize_t
2023 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2024                       const char *buf, size_t count)
2025 {
2026         struct lcs_card *card = dev_get_drvdata(dev);
2027         char *tmp;
2028         int i;
2029
2030         if (!card)
2031                 return -EINVAL;
2032         if (card->state != DEV_STATE_UP)
2033                 return -EPERM;
2034         i = simple_strtoul(buf, &tmp, 16);
2035         if (i == 1)
2036                 lcs_schedule_recovery(card);
2037         return count;
2038 }
2039
2040 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2041
2042 static struct attribute * lcs_attrs[] = {
2043         &dev_attr_portno.attr,
2044         &dev_attr_type.attr,
2045         &dev_attr_lancmd_timeout.attr,
2046         &dev_attr_recover.attr,
2047         NULL,
2048 };
2049 static struct attribute_group lcs_attr_group = {
2050         .attrs = lcs_attrs,
2051 };
2052 static const struct attribute_group *lcs_attr_groups[] = {
2053         &lcs_attr_group,
2054         NULL,
2055 };
2056 static const struct device_type lcs_devtype = {
2057         .name = "lcs",
2058         .groups = lcs_attr_groups,
2059 };
2060
2061 /**
2062  * lcs_probe_device is called on establishing a new ccwgroup_device.
2063  */
2064 static int
2065 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2066 {
2067         struct lcs_card *card;
2068
2069         if (!get_device(&ccwgdev->dev))
2070                 return -ENODEV;
2071
2072         LCS_DBF_TEXT(2, setup, "add_dev");
2073         card = lcs_alloc_card();
2074         if (!card) {
2075                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2076                 put_device(&ccwgdev->dev);
2077                 return -ENOMEM;
2078         }
2079         dev_set_drvdata(&ccwgdev->dev, card);
2080         ccwgdev->cdev[0]->handler = lcs_irq;
2081         ccwgdev->cdev[1]->handler = lcs_irq;
2082         card->gdev = ccwgdev;
2083         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2084         card->thread_start_mask = 0;
2085         card->thread_allowed_mask = 0;
2086         card->thread_running_mask = 0;
2087         ccwgdev->dev.type = &lcs_devtype;
2088
2089         return 0;
2090 }
2091
2092 static int
2093 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2094 {
2095         struct lcs_card *card;
2096
2097         LCS_DBF_TEXT(2, setup, "regnetdv");
2098         card = dev_get_drvdata(&ccwgdev->dev);
2099         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2100                 return 0;
2101         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2102         return register_netdev(card->dev);
2103 }
2104
2105 /**
2106  * lcs_new_device will be called by setting the group device online.
2107  */
2108 static const struct net_device_ops lcs_netdev_ops = {
2109         .ndo_open               = lcs_open_device,
2110         .ndo_stop               = lcs_stop_device,
2111         .ndo_get_stats          = lcs_getstats,
2112         .ndo_start_xmit         = lcs_start_xmit,
2113 };
2114
2115 static const struct net_device_ops lcs_mc_netdev_ops = {
2116         .ndo_open               = lcs_open_device,
2117         .ndo_stop               = lcs_stop_device,
2118         .ndo_get_stats          = lcs_getstats,
2119         .ndo_start_xmit         = lcs_start_xmit,
2120         .ndo_set_rx_mode        = lcs_set_multicast_list,
2121 };
2122
2123 static int
2124 lcs_new_device(struct ccwgroup_device *ccwgdev)
2125 {
2126         struct  lcs_card *card;
2127         struct net_device *dev=NULL;
2128         enum lcs_dev_states recover_state;
2129         int rc;
2130
2131         card = dev_get_drvdata(&ccwgdev->dev);
2132         if (!card)
2133                 return -ENODEV;
2134
2135         LCS_DBF_TEXT(2, setup, "newdev");
2136         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2137         card->read.ccwdev  = ccwgdev->cdev[0];
2138         card->write.ccwdev = ccwgdev->cdev[1];
2139
2140         recover_state = card->state;
2141         rc = ccw_device_set_online(card->read.ccwdev);
2142         if (rc)
2143                 goto out_err;
2144         rc = ccw_device_set_online(card->write.ccwdev);
2145         if (rc)
2146                 goto out_werr;
2147
2148         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2149
2150         lcs_setup_card(card);
2151         rc = lcs_detect(card);
2152         if (rc) {
2153                 LCS_DBF_TEXT(2, setup, "dtctfail");
2154                 dev_err(&card->dev->dev,
2155                         "Detecting a network adapter for LCS devices"
2156                         " failed with rc=%d (0x%x)\n", rc, rc);
2157                 lcs_stopcard(card);
2158                 goto out;
2159         }
2160         if (card->dev) {
2161                 LCS_DBF_TEXT(2, setup, "samedev");
2162                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2163                 goto netdev_out;
2164         }
2165         switch (card->lan_type) {
2166 #ifdef CONFIG_ETHERNET
2167         case LCS_FRAME_TYPE_ENET:
2168                 card->lan_type_trans = eth_type_trans;
2169                 dev = alloc_etherdev(0);
2170                 break;
2171 #endif
2172 #ifdef CONFIG_FDDI
2173         case LCS_FRAME_TYPE_FDDI:
2174                 card->lan_type_trans = fddi_type_trans;
2175                 dev = alloc_fddidev(0);
2176                 break;
2177 #endif
2178         default:
2179                 LCS_DBF_TEXT(3, setup, "errinit");
2180                 pr_err(" Initialization failed\n");
2181                 goto out;
2182         }
2183         if (!dev)
2184                 goto out;
2185         card->dev = dev;
2186         card->dev->ml_priv = card;
2187         card->dev->netdev_ops = &lcs_netdev_ops;
2188         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2189 #ifdef CONFIG_IP_MULTICAST
2190         if (!lcs_check_multicast_support(card))
2191                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2192 #endif
2193 netdev_out:
2194         lcs_set_allowed_threads(card,0xffffffff);
2195         if (recover_state == DEV_STATE_RECOVER) {
2196                 lcs_set_multicast_list(card->dev);
2197                 card->dev->flags |= IFF_UP;
2198                 netif_carrier_on(card->dev);
2199                 netif_wake_queue(card->dev);
2200                 card->state = DEV_STATE_UP;
2201         } else {
2202                 lcs_stopcard(card);
2203         }
2204
2205         if (lcs_register_netdev(ccwgdev) != 0)
2206                 goto out;
2207
2208         /* Print out supported assists: IPv6 */
2209         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2210                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2211                 "with" : "without");
2212         /* Print out supported assist: Multicast */
2213         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2214                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2215                 "with" : "without");
2216         return 0;
2217 out:
2218
2219         ccw_device_set_offline(card->write.ccwdev);
2220 out_werr:
2221         ccw_device_set_offline(card->read.ccwdev);
2222 out_err:
2223         return -ENODEV;
2224 }
2225
2226 /**
2227  * lcs_shutdown_device, called when setting the group device offline.
2228  */
2229 static int
2230 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2231 {
2232         struct lcs_card *card;
2233         enum lcs_dev_states recover_state;
2234         int ret = 0, ret2 = 0, ret3 = 0;
2235
2236         LCS_DBF_TEXT(3, setup, "shtdndev");
2237         card = dev_get_drvdata(&ccwgdev->dev);
2238         if (!card)
2239                 return -ENODEV;
2240         if (recovery_mode == 0) {
2241                 lcs_set_allowed_threads(card, 0);
2242                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2243                         return -ERESTARTSYS;
2244         }
2245         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2246         recover_state = card->state;
2247
2248         ret = lcs_stop_device(card->dev);
2249         ret2 = ccw_device_set_offline(card->read.ccwdev);
2250         ret3 = ccw_device_set_offline(card->write.ccwdev);
2251         if (!ret)
2252                 ret = (ret2) ? ret2 : ret3;
2253         if (ret)
2254                 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2255         if (recover_state == DEV_STATE_UP) {
2256                 card->state = DEV_STATE_RECOVER;
2257         }
2258         return 0;
2259 }
2260
2261 static int
2262 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2263 {
2264         return __lcs_shutdown_device(ccwgdev, 0);
2265 }
2266
2267 /**
2268  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2269  */
2270 static int
2271 lcs_recovery(void *ptr)
2272 {
2273         struct lcs_card *card;
2274         struct ccwgroup_device *gdev;
2275         int rc;
2276
2277         card = (struct lcs_card *) ptr;
2278
2279         LCS_DBF_TEXT(4, trace, "recover1");
2280         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2281                 return 0;
2282         LCS_DBF_TEXT(4, trace, "recover2");
2283         gdev = card->gdev;
2284         dev_warn(&gdev->dev,
2285                 "A recovery process has been started for the LCS device\n");
2286         rc = __lcs_shutdown_device(gdev, 1);
2287         rc = lcs_new_device(gdev);
2288         if (!rc)
2289                 pr_info("Device %s successfully recovered!\n",
2290                         card->dev->name);
2291         else
2292                 pr_info("Device %s could not be recovered!\n",
2293                         card->dev->name);
2294         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2295         return 0;
2296 }
2297
2298 /**
2299  * lcs_remove_device, free buffers and card
2300  */
2301 static void
2302 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2303 {
2304         struct lcs_card *card;
2305
2306         card = dev_get_drvdata(&ccwgdev->dev);
2307         if (!card)
2308                 return;
2309
2310         LCS_DBF_TEXT(3, setup, "remdev");
2311         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2312         if (ccwgdev->state == CCWGROUP_ONLINE) {
2313                 lcs_shutdown_device(ccwgdev);
2314         }
2315         if (card->dev)
2316                 unregister_netdev(card->dev);
2317         lcs_cleanup_card(card);
2318         lcs_free_card(card);
2319         dev_set_drvdata(&ccwgdev->dev, NULL);
2320         put_device(&ccwgdev->dev);
2321 }
2322
2323 static int lcs_pm_suspend(struct lcs_card *card)
2324 {
2325         if (card->dev)
2326                 netif_device_detach(card->dev);
2327         lcs_set_allowed_threads(card, 0);
2328         lcs_wait_for_threads(card, 0xffffffff);
2329         if (card->state != DEV_STATE_DOWN)
2330                 __lcs_shutdown_device(card->gdev, 1);
2331         return 0;
2332 }
2333
2334 static int lcs_pm_resume(struct lcs_card *card)
2335 {
2336         int rc = 0;
2337
2338         if (card->state == DEV_STATE_RECOVER)
2339                 rc = lcs_new_device(card->gdev);
2340         if (card->dev)
2341                 netif_device_attach(card->dev);
2342         if (rc) {
2343                 dev_warn(&card->gdev->dev, "The lcs device driver "
2344                         "failed to recover the device\n");
2345         }
2346         return rc;
2347 }
2348
2349 static int lcs_prepare(struct ccwgroup_device *gdev)
2350 {
2351         return 0;
2352 }
2353
2354 static void lcs_complete(struct ccwgroup_device *gdev)
2355 {
2356         return;
2357 }
2358
2359 static int lcs_freeze(struct ccwgroup_device *gdev)
2360 {
2361         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2362         return lcs_pm_suspend(card);
2363 }
2364
2365 static int lcs_thaw(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 int lcs_restore(struct ccwgroup_device *gdev)
2372 {
2373         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2374         return lcs_pm_resume(card);
2375 }
2376
2377 static struct ccw_device_id lcs_ids[] = {
2378         {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2379         {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2380         {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2381         {},
2382 };
2383 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2384
2385 static struct ccw_driver lcs_ccw_driver = {
2386         .driver = {
2387                 .owner  = THIS_MODULE,
2388                 .name   = "lcs",
2389         },
2390         .ids    = lcs_ids,
2391         .probe  = ccwgroup_probe_ccwdev,
2392         .remove = ccwgroup_remove_ccwdev,
2393         .int_class = IRQIO_LCS,
2394 };
2395
2396 /**
2397  * LCS ccwgroup driver registration
2398  */
2399 static struct ccwgroup_driver lcs_group_driver = {
2400         .driver = {
2401                 .owner  = THIS_MODULE,
2402                 .name   = "lcs",
2403         },
2404         .setup       = lcs_probe_device,
2405         .remove      = lcs_remove_device,
2406         .set_online  = lcs_new_device,
2407         .set_offline = lcs_shutdown_device,
2408         .prepare     = lcs_prepare,
2409         .complete    = lcs_complete,
2410         .freeze      = lcs_freeze,
2411         .thaw        = lcs_thaw,
2412         .restore     = lcs_restore,
2413 };
2414
2415 static ssize_t lcs_driver_group_store(struct device_driver *ddrv,
2416                                       const char *buf, size_t count)
2417 {
2418         int err;
2419         err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2420         return err ? err : count;
2421 }
2422 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2423
2424 static struct attribute *lcs_drv_attrs[] = {
2425         &driver_attr_group.attr,
2426         NULL,
2427 };
2428 static struct attribute_group lcs_drv_attr_group = {
2429         .attrs = lcs_drv_attrs,
2430 };
2431 static const struct attribute_group *lcs_drv_attr_groups[] = {
2432         &lcs_drv_attr_group,
2433         NULL,
2434 };
2435
2436 /**
2437  *  LCS Module/Kernel initialization function
2438  */
2439 static int
2440 __init lcs_init_module(void)
2441 {
2442         int rc;
2443
2444         pr_info("Loading %s\n", version);
2445         rc = lcs_register_debug_facility();
2446         LCS_DBF_TEXT(0, setup, "lcsinit");
2447         if (rc)
2448                 goto out_err;
2449         lcs_root_dev = root_device_register("lcs");
2450         rc = PTR_ERR_OR_ZERO(lcs_root_dev);
2451         if (rc)
2452                 goto register_err;
2453         rc = ccw_driver_register(&lcs_ccw_driver);
2454         if (rc)
2455                 goto ccw_err;
2456         lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2457         rc = ccwgroup_driver_register(&lcs_group_driver);
2458         if (rc)
2459                 goto ccwgroup_err;
2460         return 0;
2461
2462 ccwgroup_err:
2463         ccw_driver_unregister(&lcs_ccw_driver);
2464 ccw_err:
2465         root_device_unregister(lcs_root_dev);
2466 register_err:
2467         lcs_unregister_debug_facility();
2468 out_err:
2469         pr_err("Initializing the lcs device driver failed\n");
2470         return rc;
2471 }
2472
2473
2474 /**
2475  *  LCS module cleanup function
2476  */
2477 static void
2478 __exit lcs_cleanup_module(void)
2479 {
2480         pr_info("Terminating lcs module.\n");
2481         LCS_DBF_TEXT(0, trace, "cleanup");
2482         ccwgroup_driver_unregister(&lcs_group_driver);
2483         ccw_driver_unregister(&lcs_ccw_driver);
2484         root_device_unregister(lcs_root_dev);
2485         lcs_unregister_debug_facility();
2486 }
2487
2488 module_init(lcs_init_module);
2489 module_exit(lcs_cleanup_module);
2490
2491 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2492 MODULE_LICENSE("GPL");
2493