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/trdevice.h>
  34 #include <linux/fddidevice.h>
  35 #include <linux/inetdevice.h>
  36 #include <linux/in.h>
  37 #include <linux/igmp.h>
  38 #include <linux/delay.h>
  39 #include <linux/kthread.h>
  40 #include <linux/slab.h>
  41 #include <net/arp.h>
  42 #include <net/ip.h>
  43
  44 #include <asm/debug.h>
  45 #include <asm/idals.h>
  46 #include <asm/timex.h>
  47 #include <linux/device.h>
  48 #include <asm/ccwgroup.h>
  49
  50 #include "lcs.h"
  51
  52
  53 #if !defined(CONFIG_NET_ETHERNET) && \
  54     !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
  55 #error Cannot compile lcs.c without some net devices switched on.
  56 #endif
  57
  58 /**
  59  * initialization string for output
  60  */
  61
  62 static char version[] __initdata = "LCS driver";
  63
  64 /**
  65   * the root device for lcs group devices
  66   */
  67 static struct device *lcs_root_dev;
  68
  69 /**
  70  * Some prototypes.
  71  */
  72 static void lcs_tasklet(unsigned long);
  73 static void lcs_start_kernel_thread(struct work_struct *);
  74 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  75 #ifdef CONFIG_IP_MULTICAST
  76 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  77 #endif /* CONFIG_IP_MULTICAST */
  78 static int lcs_recovery(void *ptr);
  79
  80 /**
  81  * Debug Facility Stuff
  82  */
  83 static char debug_buffer[255];
  84 static debug_info_t *lcs_dbf_setup;
  85 static debug_info_t *lcs_dbf_trace;
  86
  87 /**
  88  *  LCS Debug Facility functions
  89  */
  90 static void
  91 lcs_unregister_debug_facility(void)
  92 {
  93         if (lcs_dbf_setup)
  94                 debug_unregister(lcs_dbf_setup);
  95         if (lcs_dbf_trace)
  96                 debug_unregister(lcs_dbf_trace);
  97 }
  98
  99 static int
 100 lcs_register_debug_facility(void)
 101 {
 102         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
 103         lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
 104         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
 105                 pr_err("Not enough memory for debug facility.\n");
 106                 lcs_unregister_debug_facility();
 107                 return -ENOMEM;
 108         }
 109         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 110         debug_set_level(lcs_dbf_setup, 2);
 111         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 112         debug_set_level(lcs_dbf_trace, 2);
 113         return 0;
 114 }
 115
 116 /**
 117  * Allocate io buffers.
 118  */
 119 static int
 120 lcs_alloc_channel(struct lcs_channel *channel)
 121 {
 122         int cnt;
 123
 124         LCS_DBF_TEXT(2, setup, "ichalloc");
 125         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 126                 /* alloc memory fo iobuffer */
 127                 channel->iob[cnt].data =
 128                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 129                 if (channel->iob[cnt].data == NULL)
 130                         break;
 131                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
 132         }
 133         if (cnt < LCS_NUM_BUFFS) {
 134                 /* Not all io buffers could be allocated. */
 135                 LCS_DBF_TEXT(2, setup, "echalloc");
 136                 while (cnt-- > 0)
 137                         kfree(channel->iob[cnt].data);
 138                 return -ENOMEM;
 139         }
 140         return 0;
 141 }
 142
 143 /**
 144  * Free io buffers.
 145  */
 146 static void
 147 lcs_free_channel(struct lcs_channel *channel)
 148 {
 149         int cnt;
 150
 151         LCS_DBF_TEXT(2, setup, "ichfree");
 152         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 153                 kfree(channel->iob[cnt].data);
 154                 channel->iob[cnt].data = NULL;
 155         }
 156 }
 157
 158 /*
 159  * Cleanup channel.
 160  */
 161 static void
 162 lcs_cleanup_channel(struct lcs_channel *channel)
 163 {
 164         LCS_DBF_TEXT(3, setup, "cleanch");
 165         /* Kill write channel tasklets. */
 166         tasklet_kill(&channel->irq_tasklet);
 167         /* Free channel buffers. */
 168         lcs_free_channel(channel);
 169 }
 170
 171 /**
 172  * LCS free memory for card and channels.
 173  */
 174 static void
 175 lcs_free_card(struct lcs_card *card)
 176 {
 177         LCS_DBF_TEXT(2, setup, "remcard");
 178         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 179         kfree(card);
 180 }
 181
 182 /**
 183  * LCS alloc memory for card and channels
 184  */
 185 static struct lcs_card *
 186 lcs_alloc_card(void)
 187 {
 188         struct lcs_card *card;
 189         int rc;
 190
 191         LCS_DBF_TEXT(2, setup, "alloclcs");
 192
 193         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 194         if (card == NULL)
 195                 return NULL;
 196         card->lan_type = LCS_FRAME_TYPE_AUTO;
 197         card->pkt_seq = 0;
 198         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 199         /* Allocate io buffers for the read channel. */
 200         rc = lcs_alloc_channel(&card->read);
 201         if (rc){
 202                 LCS_DBF_TEXT(2, setup, "iccwerr");
 203                 lcs_free_card(card);
 204                 return NULL;
 205         }
 206         /* Allocate io buffers for the write channel. */
 207         rc = lcs_alloc_channel(&card->write);
 208         if (rc) {
 209                 LCS_DBF_TEXT(2, setup, "iccwerr");
 210                 lcs_cleanup_channel(&card->read);
 211                 lcs_free_card(card);
 212                 return NULL;
 213         }
 214
 215 #ifdef CONFIG_IP_MULTICAST
 216         INIT_LIST_HEAD(&card->ipm_list);
 217 #endif
 218         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 219         return card;
 220 }
 221
 222 /*
 223  * Setup read channel.
 224  */
 225 static void
 226 lcs_setup_read_ccws(struct lcs_card *card)
 227 {
 228         int cnt;
 229
 230         LCS_DBF_TEXT(2, setup, "ireadccw");
 231         /* Setup read ccws. */
 232         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 233         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 234                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 235                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 236                 card->read.ccws[cnt].flags =
 237                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 238                 /*
 239                  * Note: we have allocated the buffer with GFP_DMA, so
 240                  * we do not need to do set_normalized_cda.
 241                  */
 242                 card->read.ccws[cnt].cda =
 243                         (__u32) __pa(card->read.iob[cnt].data);
 244                 ((struct lcs_header *)
 245                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 246                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 247                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
 248                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 249         }
 250         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 251         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 252         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 253         /* Last ccw is a tic (transfer in channel). */
 254         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 255         card->read.ccws[LCS_NUM_BUFFS].cda =
 256                 (__u32) __pa(card->read.ccws);
 257         /* Setg initial state of the read channel. */
 258         card->read.state = LCS_CH_STATE_INIT;
 259
 260         card->read.io_idx = 0;
 261         card->read.buf_idx = 0;
 262 }
 263
 264 static void
 265 lcs_setup_read(struct lcs_card *card)
 266 {
 267         LCS_DBF_TEXT(3, setup, "initread");
 268
 269         lcs_setup_read_ccws(card);
 270         /* Initialize read channel tasklet. */
 271         card->read.irq_tasklet.data = (unsigned long) &card->read;
 272         card->read.irq_tasklet.func = lcs_tasklet;
 273         /* Initialize waitqueue. */
 274         init_waitqueue_head(&card->read.wait_q);
 275 }
 276
 277 /*
 278  * Setup write channel.
 279  */
 280 static void
 281 lcs_setup_write_ccws(struct lcs_card *card)
 282 {
 283         int cnt;
 284
 285         LCS_DBF_TEXT(3, setup, "iwritccw");
 286         /* Setup write ccws. */
 287         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 288         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 289                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 290                 card->write.ccws[cnt].count = 0;
 291                 card->write.ccws[cnt].flags =
 292                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 293                 /*
 294                  * Note: we have allocated the buffer with GFP_DMA, so
 295                  * we do not need to do set_normalized_cda.
 296                  */
 297                 card->write.ccws[cnt].cda =
 298                         (__u32) __pa(card->write.iob[cnt].data);
 299         }
 300         /* Last ccw is a tic (transfer in channel). */
 301         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 302         card->write.ccws[LCS_NUM_BUFFS].cda =
 303                 (__u32) __pa(card->write.ccws);
 304         /* Set initial state of the write channel. */
 305         card->read.state = LCS_CH_STATE_INIT;
 306
 307         card->write.io_idx = 0;
 308         card->write.buf_idx = 0;
 309 }
 310
 311 static void
 312 lcs_setup_write(struct lcs_card *card)
 313 {
 314         LCS_DBF_TEXT(3, setup, "initwrit");
 315
 316         lcs_setup_write_ccws(card);
 317         /* Initialize write channel tasklet. */
 318         card->write.irq_tasklet.data = (unsigned long) &card->write;
 319         card->write.irq_tasklet.func = lcs_tasklet;
 320         /* Initialize waitqueue. */
 321         init_waitqueue_head(&card->write.wait_q);
 322 }
 323
 324 static void
 325 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 326 {
 327         unsigned long flags;
 328
 329         spin_lock_irqsave(&card->mask_lock, flags);
 330         card->thread_allowed_mask = threads;
 331         spin_unlock_irqrestore(&card->mask_lock, flags);
 332         wake_up(&card->wait_q);
 333 }
 334 static inline int
 335 lcs_threads_running(struct lcs_card *card, unsigned long threads)
 336 {
 337         unsigned long flags;
 338         int rc = 0;
 339
 340         spin_lock_irqsave(&card->mask_lock, flags);
 341         rc = (card->thread_running_mask & threads);
 342         spin_unlock_irqrestore(&card->mask_lock, flags);
 343         return rc;
 344 }
 345
 346 static int
 347 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 348 {
 349         return wait_event_interruptible(card->wait_q,
 350                         lcs_threads_running(card, threads) == 0);
 351 }
 352
 353 static inline int
 354 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 355 {
 356         unsigned long flags;
 357
 358         spin_lock_irqsave(&card->mask_lock, flags);
 359         if ( !(card->thread_allowed_mask & thread) ||
 360               (card->thread_start_mask & thread) ) {
 361                 spin_unlock_irqrestore(&card->mask_lock, flags);
 362                 return -EPERM;
 363         }
 364         card->thread_start_mask |= thread;
 365         spin_unlock_irqrestore(&card->mask_lock, flags);
 366         return 0;
 367 }
 368
 369 static void
 370 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 371 {
 372         unsigned long flags;
 373
 374         spin_lock_irqsave(&card->mask_lock, flags);
 375         card->thread_running_mask &= ~thread;
 376         spin_unlock_irqrestore(&card->mask_lock, flags);
 377         wake_up(&card->wait_q);
 378 }
 379
 380 static inline int
 381 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 382 {
 383         unsigned long flags;
 384         int rc = 0;
 385
 386         spin_lock_irqsave(&card->mask_lock, flags);
 387         if (card->thread_start_mask & thread){
 388                 if ((card->thread_allowed_mask & thread) &&
 389                     !(card->thread_running_mask & thread)){
 390                         rc = 1;
 391                         card->thread_start_mask &= ~thread;
 392                         card->thread_running_mask |= thread;
 393                 } else
 394                         rc = -EPERM;
 395         }
 396         spin_unlock_irqrestore(&card->mask_lock, flags);
 397         return rc;
 398 }
 399
 400 static int
 401 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 402 {
 403         int rc = 0;
 404         wait_event(card->wait_q,
 405                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 406         return rc;
 407 }
 408
 409 static int
 410 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 411 {
 412         unsigned long flags;
 413         int rc = 0;
 414
 415         spin_lock_irqsave(&card->mask_lock, flags);
 416         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 417                         (u8) card->thread_start_mask,
 418                         (u8) card->thread_allowed_mask,
 419                         (u8) card->thread_running_mask);
 420         rc = (card->thread_start_mask & thread);
 421         spin_unlock_irqrestore(&card->mask_lock, flags);
 422         return rc;
 423 }
 424
 425 /**
 426  * Initialize channels,card and state machines.
 427  */
 428 static void
 429 lcs_setup_card(struct lcs_card *card)
 430 {
 431         LCS_DBF_TEXT(2, setup, "initcard");
 432         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 433
 434         lcs_setup_read(card);
 435         lcs_setup_write(card);
 436         /* Set cards initial state. */
 437         card->state = DEV_STATE_DOWN;
 438         card->tx_buffer = NULL;
 439         card->tx_emitted = 0;
 440
 441         init_waitqueue_head(&card->wait_q);
 442         spin_lock_init(&card->lock);
 443         spin_lock_init(&card->ipm_lock);
 444         spin_lock_init(&card->mask_lock);
 445 #ifdef CONFIG_IP_MULTICAST
 446         INIT_LIST_HEAD(&card->ipm_list);
 447 #endif
 448         INIT_LIST_HEAD(&card->lancmd_waiters);
 449 }
 450
 451 static inline void
 452 lcs_clear_multicast_list(struct lcs_card *card)
 453 {
 454 #ifdef  CONFIG_IP_MULTICAST
 455         struct lcs_ipm_list *ipm;
 456         unsigned long flags;
 457
 458         /* Free multicast list. */
 459         LCS_DBF_TEXT(3, setup, "clmclist");
 460         spin_lock_irqsave(&card->ipm_lock, flags);
 461         while (!list_empty(&card->ipm_list)){
 462                 ipm = list_entry(card->ipm_list.next,
 463                                  struct lcs_ipm_list, list);
 464                 list_del(&ipm->list);
 465                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 466                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 467                         lcs_send_delipm(card, ipm);
 468                         spin_lock_irqsave(&card->ipm_lock, flags);
 469                 }
 470                 kfree(ipm);
 471         }
 472         spin_unlock_irqrestore(&card->ipm_lock, flags);
 473 #endif
 474 }
 475 /**
 476  * Cleanup channels,card and state machines.
 477  */
 478 static void
 479 lcs_cleanup_card(struct lcs_card *card)
 480 {
 481
 482         LCS_DBF_TEXT(3, setup, "cleancrd");
 483         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 484
 485         if (card->dev != NULL)
 486                 free_netdev(card->dev);
 487         /* Cleanup channels. */
 488         lcs_cleanup_channel(&card->write);
 489         lcs_cleanup_channel(&card->read);
 490 }
 491
 492 /**
 493  * Start channel.
 494  */
 495 static int
 496 lcs_start_channel(struct lcs_channel *channel)
 497 {
 498         unsigned long flags;
 499         int rc;
 500
 501         LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
 502         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 503         rc = ccw_device_start(channel->ccwdev,
 504                               channel->ccws + channel->io_idx, 0, 0,
 505                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 506         if (rc == 0)
 507                 channel->state = LCS_CH_STATE_RUNNING;
 508         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 509         if (rc) {
 510                 LCS_DBF_TEXT_(4,trace,"essh%s",
 511                               dev_name(&channel->ccwdev->dev));
 512                 dev_err(&channel->ccwdev->dev,
 513                         "Starting an LCS device resulted in an error,"
 514                         " rc=%d!\n", rc);
 515         }
 516         return rc;
 517 }
 518
 519 static int
 520 lcs_clear_channel(struct lcs_channel *channel)
 521 {
 522         unsigned long flags;
 523         int rc;
 524
 525         LCS_DBF_TEXT(4,trace,"clearch");
 526         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 527         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 528         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 529         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 530         if (rc) {
 531                 LCS_DBF_TEXT_(4, trace, "ecsc%s",
 532                               dev_name(&channel->ccwdev->dev));
 533                 return rc;
 534         }
 535         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
 536         channel->state = LCS_CH_STATE_STOPPED;
 537         return rc;
 538 }
 539
 540
 541 /**
 542  * Stop channel.
 543  */
 544 static int
 545 lcs_stop_channel(struct lcs_channel *channel)
 546 {
 547         unsigned long flags;
 548         int rc;
 549
 550         if (channel->state == LCS_CH_STATE_STOPPED)
 551                 return 0;
 552         LCS_DBF_TEXT(4,trace,"haltsch");
 553         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 554         channel->state = LCS_CH_STATE_INIT;
 555         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 556         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 557         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 558         if (rc) {
 559                 LCS_DBF_TEXT_(4, trace, "ehsc%s",
 560                               dev_name(&channel->ccwdev->dev));
 561                 return rc;
 562         }
 563         /* Asynchronous halt initialted. Wait for its completion. */
 564         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
 565         lcs_clear_channel(channel);
 566         return 0;
 567 }
 568
 569 /**
 570  * start read and write channel
 571  */
 572 static int
 573 lcs_start_channels(struct lcs_card *card)
 574 {
 575         int rc;
 576
 577         LCS_DBF_TEXT(2, trace, "chstart");
 578         /* start read channel */
 579         rc = lcs_start_channel(&card->read);
 580         if (rc)
 581                 return rc;
 582         /* start write channel */
 583         rc = lcs_start_channel(&card->write);
 584         if (rc)
 585                 lcs_stop_channel(&card->read);
 586         return rc;
 587 }
 588
 589 /**
 590  * stop read and write channel
 591  */
 592 static int
 593 lcs_stop_channels(struct lcs_card *card)
 594 {
 595         LCS_DBF_TEXT(2, trace, "chhalt");
 596         lcs_stop_channel(&card->read);
 597         lcs_stop_channel(&card->write);
 598         return 0;
 599 }
 600
 601 /**
 602  * Get empty buffer.
 603  */
 604 static struct lcs_buffer *
 605 __lcs_get_buffer(struct lcs_channel *channel)
 606 {
 607         int index;
 608
 609         LCS_DBF_TEXT(5, trace, "_getbuff");
 610         index = channel->io_idx;
 611         do {
 612                 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
 613                         channel->iob[index].state = LCS_BUF_STATE_LOCKED;
 614                         return channel->iob + index;
 615                 }
 616                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 617         } while (index != channel->io_idx);
 618         return NULL;
 619 }
 620
 621 static struct lcs_buffer *
 622 lcs_get_buffer(struct lcs_channel *channel)
 623 {
 624         struct lcs_buffer *buffer;
 625         unsigned long flags;
 626
 627         LCS_DBF_TEXT(5, trace, "getbuff");
 628         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 629         buffer = __lcs_get_buffer(channel);
 630         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 631         return buffer;
 632 }
 633
 634 /**
 635  * Resume channel program if the channel is suspended.
 636  */
 637 static int
 638 __lcs_resume_channel(struct lcs_channel *channel)
 639 {
 640         int rc;
 641
 642         if (channel->state != LCS_CH_STATE_SUSPENDED)
 643                 return 0;
 644         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 645                 return 0;
 646         LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
 647         rc = ccw_device_resume(channel->ccwdev);
 648         if (rc) {
 649                 LCS_DBF_TEXT_(4, trace, "ersc%s",
 650                               dev_name(&channel->ccwdev->dev));
 651                 dev_err(&channel->ccwdev->dev,
 652                         "Sending data from the LCS device to the LAN failed"
 653                         " with rc=%d\n",rc);
 654         } else
 655                 channel->state = LCS_CH_STATE_RUNNING;
 656         return rc;
 657
 658 }
 659
 660 /**
 661  * Make a buffer ready for processing.
 662  */
 663 static inline void
 664 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 665 {
 666         int prev, next;
 667
 668         LCS_DBF_TEXT(5, trace, "rdybits");
 669         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 670         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 671         /* Check if we may clear the suspend bit of this buffer. */
 672         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 673                 /* Check if we have to set the PCI bit. */
 674                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 675                         /* Suspend bit of the previous buffer is not set. */
 676                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 677                 /* Suspend bit of the next buffer is set. */
 678                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 679         }
 680 }
 681
 682 static int
 683 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 684 {
 685         unsigned long flags;
 686         int index, rc;
 687
 688         LCS_DBF_TEXT(5, trace, "rdybuff");
 689         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 690                buffer->state != LCS_BUF_STATE_PROCESSED);
 691         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 692         buffer->state = LCS_BUF_STATE_READY;
 693         index = buffer - channel->iob;
 694         /* Set length. */
 695         channel->ccws[index].count = buffer->count;
 696         /* Check relevant PCI/suspend bits. */
 697         __lcs_ready_buffer_bits(channel, index);
 698         rc = __lcs_resume_channel(channel);
 699         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 700         return rc;
 701 }
 702
 703 /**
 704  * Mark the buffer as processed. Take care of the suspend bit
 705  * of the previous buffer. This function is called from
 706  * interrupt context, so the lock must not be taken.
 707  */
 708 static int
 709 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 710 {
 711         int index, prev, next;
 712
 713         LCS_DBF_TEXT(5, trace, "prcsbuff");
 714         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
 715         buffer->state = LCS_BUF_STATE_PROCESSED;
 716         index = buffer - channel->iob;
 717         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 718         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 719         /* Set the suspend bit and clear the PCI bit of this buffer. */
 720         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 721         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 722         /* Check the suspend bit of the previous buffer. */
 723         if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
 724                 /*
 725                  * Previous buffer is in state ready. It might have
 726                  * happened in lcs_ready_buffer that the suspend bit
 727                  * has not been cleared to avoid an endless loop.
 728                  * Do it now.
 729                  */
 730                 __lcs_ready_buffer_bits(channel, prev);
 731         }
 732         /* Clear PCI bit of next buffer. */
 733         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 734         return __lcs_resume_channel(channel);
 735 }
 736
 737 /**
 738  * Put a processed buffer back to state empty.
 739  */
 740 static void
 741 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 742 {
 743         unsigned long flags;
 744
 745         LCS_DBF_TEXT(5, trace, "relbuff");
 746         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 747                buffer->state != LCS_BUF_STATE_PROCESSED);
 748         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 749         buffer->state = LCS_BUF_STATE_EMPTY;
 750         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 751 }
 752
 753 /**
 754  * Get buffer for a lan command.
 755  */
 756 static struct lcs_buffer *
 757 lcs_get_lancmd(struct lcs_card *card, int count)
 758 {
 759         struct lcs_buffer *buffer;
 760         struct lcs_cmd *cmd;
 761
 762         LCS_DBF_TEXT(4, trace, "getlncmd");
 763         /* Get buffer and wait if none is available. */
 764         wait_event(card->write.wait_q,
 765                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 766         count += sizeof(struct lcs_header);
 767         *(__u16 *)(buffer->data + count) = 0;
 768         buffer->count = count + sizeof(__u16);
 769         buffer->callback = lcs_release_buffer;
 770         cmd = (struct lcs_cmd *) buffer->data;
 771         cmd->offset = count;
 772         cmd->type = LCS_FRAME_TYPE_CONTROL;
 773         cmd->slot = 0;
 774         return buffer;
 775 }
 776
 777
 778 static void
 779 lcs_get_reply(struct lcs_reply *reply)
 780 {
 781         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 782         atomic_inc(&reply->refcnt);
 783 }
 784
 785 static void
 786 lcs_put_reply(struct lcs_reply *reply)
 787 {
 788         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 789         if (atomic_dec_and_test(&reply->refcnt)) {
 790                 kfree(reply);
 791         }
 792
 793 }
 794
 795 static struct lcs_reply *
 796 lcs_alloc_reply(struct lcs_cmd *cmd)
 797 {
 798         struct lcs_reply *reply;
 799
 800         LCS_DBF_TEXT(4, trace, "getreply");
 801
 802         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 803         if (!reply)
 804                 return NULL;
 805         atomic_set(&reply->refcnt,1);
 806         reply->sequence_no = cmd->sequence_no;
 807         reply->received = 0;
 808         reply->rc = 0;
 809         init_waitqueue_head(&reply->wait_q);
 810
 811         return reply;
 812 }
 813
 814 /**
 815  * Notifier function for lancmd replies. Called from read irq.
 816  */
 817 static void
 818 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 819 {
 820         struct list_head *l, *n;
 821         struct lcs_reply *reply;
 822
 823         LCS_DBF_TEXT(4, trace, "notiwait");
 824         spin_lock(&card->lock);
 825         list_for_each_safe(l, n, &card->lancmd_waiters) {
 826                 reply = list_entry(l, struct lcs_reply, list);
 827                 if (reply->sequence_no == cmd->sequence_no) {
 828                         lcs_get_reply(reply);
 829                         list_del_init(&reply->list);
 830                         if (reply->callback != NULL)
 831                                 reply->callback(card, cmd);
 832                         reply->received = 1;
 833                         reply->rc = cmd->return_code;
 834                         wake_up(&reply->wait_q);
 835                         lcs_put_reply(reply);
 836                         break;
 837                 }
 838         }
 839         spin_unlock(&card->lock);
 840 }
 841
 842 /**
 843  * Emit buffer of a lan comand.
 844  */
 845 static void
 846 lcs_lancmd_timeout(unsigned long data)
 847 {
 848         struct lcs_reply *reply, *list_reply, *r;
 849         unsigned long flags;
 850
 851         LCS_DBF_TEXT(4, trace, "timeout");
 852         reply = (struct lcs_reply *) data;
 853         spin_lock_irqsave(&reply->card->lock, flags);
 854         list_for_each_entry_safe(list_reply, r,
 855                                  &reply->card->lancmd_waiters,list) {
 856                 if (reply == list_reply) {
 857                         lcs_get_reply(reply);
 858                         list_del_init(&reply->list);
 859                         spin_unlock_irqrestore(&reply->card->lock, flags);
 860                         reply->received = 1;
 861                         reply->rc = -ETIME;
 862                         wake_up(&reply->wait_q);
 863                         lcs_put_reply(reply);
 864                         return;
 865                 }
 866         }
 867         spin_unlock_irqrestore(&reply->card->lock, flags);
 868 }
 869
 870 static int
 871 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 872                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 873 {
 874         struct lcs_reply *reply;
 875         struct lcs_cmd *cmd;
 876         struct timer_list timer;
 877         unsigned long flags;
 878         int rc;
 879
 880         LCS_DBF_TEXT(4, trace, "sendcmd");
 881         cmd = (struct lcs_cmd *) buffer->data;
 882         cmd->return_code = 0;
 883         cmd->sequence_no = card->sequence_no++;
 884         reply = lcs_alloc_reply(cmd);
 885         if (!reply)
 886                 return -ENOMEM;
 887         reply->callback = reply_callback;
 888         reply->card = card;
 889         spin_lock_irqsave(&card->lock, flags);
 890         list_add_tail(&reply->list, &card->lancmd_waiters);
 891         spin_unlock_irqrestore(&card->lock, flags);
 892
 893         buffer->callback = lcs_release_buffer;
 894         rc = lcs_ready_buffer(&card->write, buffer);
 895         if (rc)
 896                 return rc;
 897         init_timer_on_stack(&timer);
 898         timer.function = lcs_lancmd_timeout;
 899         timer.data = (unsigned long) reply;
 900         timer.expires = jiffies + HZ*card->lancmd_timeout;
 901         add_timer(&timer);
 902         wait_event(reply->wait_q, reply->received);
 903         del_timer_sync(&timer);
 904         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 905         rc = reply->rc;
 906         lcs_put_reply(reply);
 907         return rc ? -EIO : 0;
 908 }
 909
 910 /**
 911  * LCS startup command
 912  */
 913 static int
 914 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 915 {
 916         struct lcs_buffer *buffer;
 917         struct lcs_cmd *cmd;
 918
 919         LCS_DBF_TEXT(2, trace, "startup");
 920         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 921         cmd = (struct lcs_cmd *) buffer->data;
 922         cmd->cmd_code = LCS_CMD_STARTUP;
 923         cmd->initiator = initiator;
 924         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 925         return lcs_send_lancmd(card, buffer, NULL);
 926 }
 927
 928 /**
 929  * LCS shutdown command
 930  */
 931 static int
 932 lcs_send_shutdown(struct lcs_card *card)
 933 {
 934         struct lcs_buffer *buffer;
 935         struct lcs_cmd *cmd;
 936
 937         LCS_DBF_TEXT(2, trace, "shutdown");
 938         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 939         cmd = (struct lcs_cmd *) buffer->data;
 940         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 941         cmd->initiator = LCS_INITIATOR_TCPIP;
 942         return lcs_send_lancmd(card, buffer, NULL);
 943 }
 944
 945 /**
 946  * LCS lanstat command
 947  */
 948 static void
 949 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 950 {
 951         LCS_DBF_TEXT(2, trace, "statcb");
 952         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 953 }
 954
 955 static int
 956 lcs_send_lanstat(struct lcs_card *card)
 957 {
 958         struct lcs_buffer *buffer;
 959         struct lcs_cmd *cmd;
 960
 961         LCS_DBF_TEXT(2,trace, "cmdstat");
 962         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 963         cmd = (struct lcs_cmd *) buffer->data;
 964         /* Setup lanstat command. */
 965         cmd->cmd_code = LCS_CMD_LANSTAT;
 966         cmd->initiator = LCS_INITIATOR_TCPIP;
 967         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 968         cmd->cmd.lcs_std_cmd.portno = card->portno;
 969         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 970 }
 971
 972 /**
 973  * send stoplan command
 974  */
 975 static int
 976 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 977 {
 978         struct lcs_buffer *buffer;
 979         struct lcs_cmd *cmd;
 980
 981         LCS_DBF_TEXT(2, trace, "cmdstpln");
 982         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 983         cmd = (struct lcs_cmd *) buffer->data;
 984         cmd->cmd_code = LCS_CMD_STOPLAN;
 985         cmd->initiator = initiator;
 986         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 987         cmd->cmd.lcs_std_cmd.portno = card->portno;
 988         return lcs_send_lancmd(card, buffer, NULL);
 989 }
 990
 991 /**
 992  * send startlan command
 993  */
 994 static void
 995 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 996 {
 997         LCS_DBF_TEXT(2, trace, "srtlancb");
 998         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 999         card->portno = cmd->cmd.lcs_std_cmd.portno;
1000 }
1001
1002 static int
1003 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1004 {
1005         struct lcs_buffer *buffer;
1006         struct lcs_cmd *cmd;
1007
1008         LCS_DBF_TEXT(2, trace, "cmdstaln");
1009         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1010         cmd = (struct lcs_cmd *) buffer->data;
1011         cmd->cmd_code = LCS_CMD_STARTLAN;
1012         cmd->initiator = initiator;
1013         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1014         cmd->cmd.lcs_std_cmd.portno = card->portno;
1015         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1016 }
1017
1018 #ifdef CONFIG_IP_MULTICAST
1019 /**
1020  * send setipm command (Multicast)
1021  */
1022 static int
1023 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1024 {
1025         struct lcs_buffer *buffer;
1026         struct lcs_cmd *cmd;
1027
1028         LCS_DBF_TEXT(2, trace, "cmdsetim");
1029         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1030         cmd = (struct lcs_cmd *) buffer->data;
1031         cmd->cmd_code = LCS_CMD_SETIPM;
1032         cmd->initiator = LCS_INITIATOR_TCPIP;
1033         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1034         cmd->cmd.lcs_qipassist.portno = card->portno;
1035         cmd->cmd.lcs_qipassist.version = 4;
1036         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1037         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1038                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1039         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1040         return lcs_send_lancmd(card, buffer, NULL);
1041 }
1042
1043 /**
1044  * send delipm command (Multicast)
1045  */
1046 static int
1047 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1048 {
1049         struct lcs_buffer *buffer;
1050         struct lcs_cmd *cmd;
1051
1052         LCS_DBF_TEXT(2, trace, "cmddelim");
1053         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1054         cmd = (struct lcs_cmd *) buffer->data;
1055         cmd->cmd_code = LCS_CMD_DELIPM;
1056         cmd->initiator = LCS_INITIATOR_TCPIP;
1057         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1058         cmd->cmd.lcs_qipassist.portno = card->portno;
1059         cmd->cmd.lcs_qipassist.version = 4;
1060         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1061         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1062                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1063         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1064         return lcs_send_lancmd(card, buffer, NULL);
1065 }
1066
1067 /**
1068  * check if multicast is supported by LCS
1069  */
1070 static void
1071 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1072 {
1073         LCS_DBF_TEXT(2, trace, "chkmccb");
1074         card->ip_assists_supported =
1075                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1076         card->ip_assists_enabled =
1077                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1078 }
1079
1080 static int
1081 lcs_check_multicast_support(struct lcs_card *card)
1082 {
1083         struct lcs_buffer *buffer;
1084         struct lcs_cmd *cmd;
1085         int rc;
1086
1087         LCS_DBF_TEXT(2, trace, "cmdqipa");
1088         /* Send query ipassist. */
1089         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1090         cmd = (struct lcs_cmd *) buffer->data;
1091         cmd->cmd_code = LCS_CMD_QIPASSIST;
1092         cmd->initiator = LCS_INITIATOR_TCPIP;
1093         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1094         cmd->cmd.lcs_qipassist.portno = card->portno;
1095         cmd->cmd.lcs_qipassist.version = 4;
1096         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1097         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1098         if (rc != 0) {
1099                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1100                 return -EOPNOTSUPP;
1101         }
1102         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1103                 return 0;
1104         return -EOPNOTSUPP;
1105 }
1106
1107 /**
1108  * set or del multicast address on LCS card
1109  */
1110 static void
1111 lcs_fix_multicast_list(struct lcs_card *card)
1112 {
1113         struct list_head failed_list;
1114         struct lcs_ipm_list *ipm, *tmp;
1115         unsigned long flags;
1116         int rc;
1117
1118         LCS_DBF_TEXT(4,trace, "fixipm");
1119         INIT_LIST_HEAD(&failed_list);
1120         spin_lock_irqsave(&card->ipm_lock, flags);
1121 list_modified:
1122         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1123                 switch (ipm->ipm_state) {
1124                 case LCS_IPM_STATE_SET_REQUIRED:
1125                         /* del from ipm_list so noone else can tamper with
1126                          * this entry */
1127                         list_del_init(&ipm->list);
1128                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1129                         rc = lcs_send_setipm(card, ipm);
1130                         spin_lock_irqsave(&card->ipm_lock, flags);
1131                         if (rc) {
1132                                 pr_info("Adding multicast address failed."
1133                                         " Table possibly full!\n");
1134                                 /* store ipm in failed list -> will be added
1135                                  * to ipm_list again, so a retry will be done
1136                                  * during the next call of this function */
1137                                 list_add_tail(&ipm->list, &failed_list);
1138                         } else {
1139                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1140                                 /* re-insert into ipm_list */
1141                                 list_add_tail(&ipm->list, &card->ipm_list);
1142                         }
1143                         goto list_modified;
1144                 case LCS_IPM_STATE_DEL_REQUIRED:
1145                         list_del(&ipm->list);
1146                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1147                         lcs_send_delipm(card, ipm);
1148                         spin_lock_irqsave(&card->ipm_lock, flags);
1149                         kfree(ipm);
1150                         goto list_modified;
1151                 case LCS_IPM_STATE_ON_CARD:
1152                         break;
1153                 }
1154         }
1155         /* re-insert all entries from the failed_list into ipm_list */
1156         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1157                 list_move_tail(&ipm->list, &card->ipm_list);
1158
1159         spin_unlock_irqrestore(&card->ipm_lock, flags);
1160 }
1161
1162 /**
1163  * get mac address for the relevant Multicast address
1164  */
1165 static void
1166 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1167 {
1168         LCS_DBF_TEXT(4,trace, "getmac");
1169         if (dev->type == ARPHRD_IEEE802_TR)
1170                 ip_tr_mc_map(ipm, mac);
1171         else
1172                 ip_eth_mc_map(ipm, mac);
1173 }
1174
1175 /**
1176  * function called by net device to handle multicast address relevant things
1177  */
1178 static inline void
1179 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1180 {
1181         struct ip_mc_list *im4;
1182         struct list_head *l;
1183         struct lcs_ipm_list *ipm;
1184         unsigned long flags;
1185         char buf[MAX_ADDR_LEN];
1186
1187         LCS_DBF_TEXT(4, trace, "remmclst");
1188         spin_lock_irqsave(&card->ipm_lock, flags);
1189         list_for_each(l, &card->ipm_list) {
1190                 ipm = list_entry(l, struct lcs_ipm_list, list);
1191                 for (im4 = rcu_dereference(in4_dev->mc_list);
1192                      im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1193                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1194                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1195                              (memcmp(buf, &ipm->ipm.mac_addr,
1196                                      LCS_MAC_LENGTH) == 0) )
1197                                 break;
1198                 }
1199                 if (im4 == NULL)
1200                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1201         }
1202         spin_unlock_irqrestore(&card->ipm_lock, flags);
1203 }
1204
1205 static inline struct lcs_ipm_list *
1206 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1207 {
1208         struct lcs_ipm_list *tmp, *ipm = NULL;
1209         struct list_head *l;
1210         unsigned long flags;
1211
1212         LCS_DBF_TEXT(4, trace, "chkmcent");
1213         spin_lock_irqsave(&card->ipm_lock, flags);
1214         list_for_each(l, &card->ipm_list) {
1215                 tmp = list_entry(l, struct lcs_ipm_list, list);
1216                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1217                      (memcmp(buf, &tmp->ipm.mac_addr,
1218                              LCS_MAC_LENGTH) == 0) ) {
1219                         ipm = tmp;
1220                         break;
1221                 }
1222         }
1223         spin_unlock_irqrestore(&card->ipm_lock, flags);
1224         return ipm;
1225 }
1226
1227 static inline void
1228 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1229 {
1230
1231         struct ip_mc_list *im4;
1232         struct lcs_ipm_list *ipm;
1233         char buf[MAX_ADDR_LEN];
1234         unsigned long flags;
1235
1236         LCS_DBF_TEXT(4, trace, "setmclst");
1237         for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1238              im4 = rcu_dereference(im4->next_rcu)) {
1239                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1240                 ipm = lcs_check_addr_entry(card, im4, buf);
1241                 if (ipm != NULL)
1242                         continue;       /* Address already in list. */
1243                 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1244                 if (ipm == NULL) {
1245                         pr_info("Not enough memory to add"
1246                                 " new multicast entry!\n");
1247                         break;
1248                 }
1249                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1250                 ipm->ipm.ip_addr = im4->multiaddr;
1251                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1252                 spin_lock_irqsave(&card->ipm_lock, flags);
1253                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1254                 list_add(&ipm->list, &card->ipm_list);
1255                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1256         }
1257 }
1258
1259 static int
1260 lcs_register_mc_addresses(void *data)
1261 {
1262         struct lcs_card *card;
1263         struct in_device *in4_dev;
1264
1265         card = (struct lcs_card *) data;
1266
1267         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1268                 return 0;
1269         LCS_DBF_TEXT(4, trace, "regmulti");
1270
1271         in4_dev = in_dev_get(card->dev);
1272         if (in4_dev == NULL)
1273                 goto out;
1274         rcu_read_lock();
1275         lcs_remove_mc_addresses(card,in4_dev);
1276         lcs_set_mc_addresses(card, in4_dev);
1277         rcu_read_unlock();
1278         in_dev_put(in4_dev);
1279
1280         netif_carrier_off(card->dev);
1281         netif_tx_disable(card->dev);
1282         wait_event(card->write.wait_q,
1283                         (card->write.state != LCS_CH_STATE_RUNNING));
1284         lcs_fix_multicast_list(card);
1285         if (card->state == DEV_STATE_UP) {
1286                 netif_carrier_on(card->dev);
1287                 netif_wake_queue(card->dev);
1288         }
1289 out:
1290         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1291         return 0;
1292 }
1293 #endif /* CONFIG_IP_MULTICAST */
1294
1295 /**
1296  * function called by net device to
1297  * handle multicast address relevant things
1298  */
1299 static void
1300 lcs_set_multicast_list(struct net_device *dev)
1301 {
1302 #ifdef CONFIG_IP_MULTICAST
1303         struct lcs_card *card;
1304
1305         LCS_DBF_TEXT(4, trace, "setmulti");
1306         card = (struct lcs_card *) dev->ml_priv;
1307
1308         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1309                 schedule_work(&card->kernel_thread_starter);
1310 #endif /* CONFIG_IP_MULTICAST */
1311 }
1312
1313 static long
1314 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1315 {
1316         if (!IS_ERR(irb))
1317                 return 0;
1318
1319         switch (PTR_ERR(irb)) {
1320         case -EIO:
1321                 dev_warn(&cdev->dev,
1322                         "An I/O-error occurred on the LCS device\n");
1323                 LCS_DBF_TEXT(2, trace, "ckirberr");
1324                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1325                 break;
1326         case -ETIMEDOUT:
1327                 dev_warn(&cdev->dev,
1328                         "A command timed out on the LCS device\n");
1329                 LCS_DBF_TEXT(2, trace, "ckirberr");
1330                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1331                 break;
1332         default:
1333                 dev_warn(&cdev->dev,
1334                         "An error occurred on the LCS device, rc=%ld\n",
1335                         PTR_ERR(irb));
1336                 LCS_DBF_TEXT(2, trace, "ckirberr");
1337                 LCS_DBF_TEXT(2, trace, "  rc???");
1338         }
1339         return PTR_ERR(irb);
1340 }
1341
1342 static int
1343 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1344 {
1345         int dstat, cstat;
1346         char *sense;
1347
1348         sense = (char *) irb->ecw;
1349         cstat = irb->scsw.cmd.cstat;
1350         dstat = irb->scsw.cmd.dstat;
1351
1352         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1353                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1354                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1355                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1356                 return 1;
1357         }
1358         if (dstat & DEV_STAT_UNIT_CHECK) {
1359                 if (sense[LCS_SENSE_BYTE_1] &
1360                     LCS_SENSE_RESETTING_EVENT) {
1361                         LCS_DBF_TEXT(2, trace, "REVIND");
1362                         return 1;
1363                 }
1364                 if (sense[LCS_SENSE_BYTE_0] &
1365                     LCS_SENSE_CMD_REJECT) {
1366                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1367                         return 0;
1368                 }
1369                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1370                     (!sense[LCS_SENSE_BYTE_1]) &&
1371                     (!sense[LCS_SENSE_BYTE_2]) &&
1372                     (!sense[LCS_SENSE_BYTE_3])) {
1373                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1374                         return 0;
1375                 }
1376                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1377                 return 1;
1378         }
1379         return 0;
1380 }
1381
1382 static void
1383 lcs_schedule_recovery(struct lcs_card *card)
1384 {
1385         LCS_DBF_TEXT(2, trace, "startrec");
1386         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1387                 schedule_work(&card->kernel_thread_starter);
1388 }
1389
1390 /**
1391  * IRQ Handler for LCS channels
1392  */
1393 static void
1394 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1395 {
1396         struct lcs_card *card;
1397         struct lcs_channel *channel;
1398         int rc, index;
1399         int cstat, dstat;
1400
1401         if (lcs_check_irb_error(cdev, irb))
1402                 return;
1403
1404         card = CARD_FROM_DEV(cdev);
1405         if (card->read.ccwdev == cdev)
1406                 channel = &card->read;
1407         else
1408                 channel = &card->write;
1409
1410         cstat = irb->scsw.cmd.cstat;
1411         dstat = irb->scsw.cmd.dstat;
1412         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1413         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1414                       irb->scsw.cmd.dstat);
1415         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1416                       irb->scsw.cmd.actl);
1417
1418         /* Check for channel and device errors presented */
1419         rc = lcs_get_problem(cdev, irb);
1420         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1421                 dev_warn(&cdev->dev,
1422                         "The LCS device stopped because of an error,"
1423                         " dstat=0x%X, cstat=0x%X \n",
1424                             dstat, cstat);
1425                 if (rc) {
1426                         channel->state = LCS_CH_STATE_ERROR;
1427                 }
1428         }
1429         if (channel->state == LCS_CH_STATE_ERROR) {
1430                 lcs_schedule_recovery(card);
1431                 wake_up(&card->wait_q);
1432                 return;
1433         }
1434         /* How far in the ccw chain have we processed? */
1435         if ((channel->state != LCS_CH_STATE_INIT) &&
1436             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1437             (irb->scsw.cmd.cpa != 0)) {
1438                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1439                         - channel->ccws;
1440                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1441                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1442                         /* Bloody io subsystem tells us lies about cpa... */
1443                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1444                 while (channel->io_idx != index) {
1445                         __lcs_processed_buffer(channel,
1446                                                channel->iob + channel->io_idx);
1447                         channel->io_idx =
1448                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1449                 }
1450         }
1451
1452         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1453             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1454             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1455                 /* Mark channel as stopped. */
1456                 channel->state = LCS_CH_STATE_STOPPED;
1457         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1458                 /* CCW execution stopped on a suspend bit. */
1459                 channel->state = LCS_CH_STATE_SUSPENDED;
1460         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1461                 if (irb->scsw.cmd.cc != 0) {
1462                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1463                         return;
1464                 }
1465                 /* The channel has been stopped by halt_IO. */
1466                 channel->state = LCS_CH_STATE_HALTED;
1467         }
1468         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1469                 channel->state = LCS_CH_STATE_CLEARED;
1470         /* Do the rest in the tasklet. */
1471         tasklet_schedule(&channel->irq_tasklet);
1472 }
1473
1474 /**
1475  * Tasklet for IRQ handler
1476  */
1477 static void
1478 lcs_tasklet(unsigned long data)
1479 {
1480         unsigned long flags;
1481         struct lcs_channel *channel;
1482         struct lcs_buffer *iob;
1483         int buf_idx;
1484         int rc;
1485
1486         channel = (struct lcs_channel *) data;
1487         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1488
1489         /* Check for processed buffers. */
1490         iob = channel->iob;
1491         buf_idx = channel->buf_idx;
1492         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1493                 /* Do the callback thing. */
1494                 if (iob[buf_idx].callback != NULL)
1495                         iob[buf_idx].callback(channel, iob + buf_idx);
1496                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1497         }
1498         channel->buf_idx = buf_idx;
1499
1500         if (channel->state == LCS_CH_STATE_STOPPED)
1501                 // FIXME: what if rc != 0 ??
1502                 rc = lcs_start_channel(channel);
1503         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1504         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1505             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1506                 // FIXME: what if rc != 0 ??
1507                 rc = __lcs_resume_channel(channel);
1508         }
1509         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1510
1511         /* Something happened on the channel. Wake up waiters. */
1512         wake_up(&channel->wait_q);
1513 }
1514
1515 /**
1516  * Finish current tx buffer and make it ready for transmit.
1517  */
1518 static void
1519 __lcs_emit_txbuffer(struct lcs_card *card)
1520 {
1521         LCS_DBF_TEXT(5, trace, "emittx");
1522         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1523         card->tx_buffer->count += 2;
1524         lcs_ready_buffer(&card->write, card->tx_buffer);
1525         card->tx_buffer = NULL;
1526         card->tx_emitted++;
1527 }
1528
1529 /**
1530  * Callback for finished tx buffers.
1531  */
1532 static void
1533 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1534 {
1535         struct lcs_card *card;
1536
1537         LCS_DBF_TEXT(5, trace, "txbuffcb");
1538         /* Put buffer back to pool. */
1539         lcs_release_buffer(channel, buffer);
1540         card = container_of(channel, struct lcs_card, write);
1541         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1542                 netif_wake_queue(card->dev);
1543         spin_lock(&card->lock);
1544         card->tx_emitted--;
1545         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1546                 /*
1547                  * Last running tx buffer has finished. Submit partially
1548                  * filled current buffer.
1549                  */
1550                 __lcs_emit_txbuffer(card);
1551         spin_unlock(&card->lock);
1552 }
1553
1554 /**
1555  * Packet transmit function called by network stack
1556  */
1557 static int
1558 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1559                  struct net_device *dev)
1560 {
1561         struct lcs_header *header;
1562         int rc = NETDEV_TX_OK;
1563
1564         LCS_DBF_TEXT(5, trace, "hardxmit");
1565         if (skb == NULL) {
1566                 card->stats.tx_dropped++;
1567                 card->stats.tx_errors++;
1568                 return NETDEV_TX_OK;
1569         }
1570         if (card->state != DEV_STATE_UP) {
1571                 dev_kfree_skb(skb);
1572                 card->stats.tx_dropped++;
1573                 card->stats.tx_errors++;
1574                 card->stats.tx_carrier_errors++;
1575                 return NETDEV_TX_OK;
1576         }
1577         if (skb->protocol == htons(ETH_P_IPV6)) {
1578                 dev_kfree_skb(skb);
1579                 return NETDEV_TX_OK;
1580         }
1581         netif_stop_queue(card->dev);
1582         spin_lock(&card->lock);
1583         if (card->tx_buffer != NULL &&
1584             card->tx_buffer->count + sizeof(struct lcs_header) +
1585             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1586                 /* skb too big for current tx buffer. */
1587                 __lcs_emit_txbuffer(card);
1588         if (card->tx_buffer == NULL) {
1589                 /* Get new tx buffer */
1590                 card->tx_buffer = lcs_get_buffer(&card->write);
1591                 if (card->tx_buffer == NULL) {
1592                         card->stats.tx_dropped++;
1593                         rc = NETDEV_TX_BUSY;
1594                         goto out;
1595                 }
1596                 card->tx_buffer->callback = lcs_txbuffer_cb;
1597                 card->tx_buffer->count = 0;
1598         }
1599         header = (struct lcs_header *)
1600                 (card->tx_buffer->data + card->tx_buffer->count);
1601         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1602         header->offset = card->tx_buffer->count;
1603         header->type = card->lan_type;
1604         header->slot = card->portno;
1605         skb_copy_from_linear_data(skb, header + 1, skb->len);
1606         spin_unlock(&card->lock);
1607         card->stats.tx_bytes += skb->len;
1608         card->stats.tx_packets++;
1609         dev_kfree_skb(skb);
1610         netif_wake_queue(card->dev);
1611         spin_lock(&card->lock);
1612         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1613                 /* If this is the first tx buffer emit it immediately. */
1614                 __lcs_emit_txbuffer(card);
1615 out:
1616         spin_unlock(&card->lock);
1617         return rc;
1618 }
1619
1620 static int
1621 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1622 {
1623         struct lcs_card *card;
1624         int rc;
1625
1626         LCS_DBF_TEXT(5, trace, "pktxmit");
1627         card = (struct lcs_card *) dev->ml_priv;
1628         rc = __lcs_start_xmit(card, skb, dev);
1629         return rc;
1630 }
1631
1632 /**
1633  * send startlan and lanstat command to make LCS device ready
1634  */
1635 static int
1636 lcs_startlan_auto(struct lcs_card *card)
1637 {
1638         int rc;
1639
1640         LCS_DBF_TEXT(2, trace, "strtauto");
1641 #ifdef CONFIG_NET_ETHERNET
1642         card->lan_type = LCS_FRAME_TYPE_ENET;
1643         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1644         if (rc == 0)
1645                 return 0;
1646
1647 #endif
1648 #ifdef CONFIG_TR
1649         card->lan_type = LCS_FRAME_TYPE_TR;
1650         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1651         if (rc == 0)
1652                 return 0;
1653 #endif
1654 #ifdef CONFIG_FDDI
1655         card->lan_type = LCS_FRAME_TYPE_FDDI;
1656         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1657         if (rc == 0)
1658                 return 0;
1659 #endif
1660         return -EIO;
1661 }
1662
1663 static int
1664 lcs_startlan(struct lcs_card *card)
1665 {
1666         int rc, i;
1667
1668         LCS_DBF_TEXT(2, trace, "startlan");
1669         rc = 0;
1670         if (card->portno != LCS_INVALID_PORT_NO) {
1671                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1672                         rc = lcs_startlan_auto(card);
1673                 else
1674                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1675         } else {
1676                 for (i = 0; i <= 16; i++) {
1677                         card->portno = i;
1678                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1679                                 rc = lcs_send_startlan(card,
1680                                                        LCS_INITIATOR_TCPIP);
1681                         else
1682                                 /* autodetecting lan type */
1683                                 rc = lcs_startlan_auto(card);
1684                         if (rc == 0)
1685                                 break;
1686                 }
1687         }
1688         if (rc == 0)
1689                 return lcs_send_lanstat(card);
1690         return rc;
1691 }
1692
1693 /**
1694  * LCS detect function
1695  * setup channels and make them I/O ready
1696  */
1697 static int
1698 lcs_detect(struct lcs_card *card)
1699 {
1700         int rc = 0;
1701
1702         LCS_DBF_TEXT(2, setup, "lcsdetct");
1703         /* start/reset card */
1704         if (card->dev)
1705                 netif_stop_queue(card->dev);
1706         rc = lcs_stop_channels(card);
1707         if (rc == 0) {
1708                 rc = lcs_start_channels(card);
1709                 if (rc == 0) {
1710                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1711                         if (rc == 0)
1712                                 rc = lcs_startlan(card);
1713                 }
1714         }
1715         if (rc == 0) {
1716                 card->state = DEV_STATE_UP;
1717         } else {
1718                 card->state = DEV_STATE_DOWN;
1719                 card->write.state = LCS_CH_STATE_INIT;
1720                 card->read.state =  LCS_CH_STATE_INIT;
1721         }
1722         return rc;
1723 }
1724
1725 /**
1726  * LCS Stop card
1727  */
1728 static int
1729 lcs_stopcard(struct lcs_card *card)
1730 {
1731         int rc;
1732
1733         LCS_DBF_TEXT(3, setup, "stopcard");
1734
1735         if (card->read.state != LCS_CH_STATE_STOPPED &&
1736             card->write.state != LCS_CH_STATE_STOPPED &&
1737             card->read.state != LCS_CH_STATE_ERROR &&
1738             card->write.state != LCS_CH_STATE_ERROR &&
1739             card->state == DEV_STATE_UP) {
1740                 lcs_clear_multicast_list(card);
1741                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1742                 rc = lcs_send_shutdown(card);
1743         }
1744         rc = lcs_stop_channels(card);
1745         card->state = DEV_STATE_DOWN;
1746
1747         return rc;
1748 }
1749
1750 /**
1751  * Kernel Thread helper functions for LGW initiated commands
1752  */
1753 static void
1754 lcs_start_kernel_thread(struct work_struct *work)
1755 {
1756         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1757         LCS_DBF_TEXT(5, trace, "krnthrd");
1758         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1759                 kthread_run(lcs_recovery, card, "lcs_recover");
1760 #ifdef CONFIG_IP_MULTICAST
1761         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1762                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1763 #endif
1764 }
1765
1766 /**
1767  * Process control frames.
1768  */
1769 static void
1770 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1771 {
1772         LCS_DBF_TEXT(5, trace, "getctrl");
1773         if (cmd->initiator == LCS_INITIATOR_LGW) {
1774                 switch(cmd->cmd_code) {
1775                 case LCS_CMD_STARTUP:
1776                 case LCS_CMD_STARTLAN:
1777                         lcs_schedule_recovery(card);
1778                         break;
1779                 case LCS_CMD_STOPLAN:
1780                         pr_warning("Stoplan for %s initiated by LGW.\n",
1781                                    card->dev->name);
1782                         if (card->dev)
1783                                 netif_carrier_off(card->dev);
1784                         break;
1785                 default:
1786                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1787                         break;
1788                 }
1789         } else
1790                 lcs_notify_lancmd_waiters(card, cmd);
1791 }
1792
1793 /**
1794  * Unpack network packet.
1795  */
1796 static void
1797 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1798 {
1799         struct sk_buff *skb;
1800
1801         LCS_DBF_TEXT(5, trace, "getskb");
1802         if (card->dev == NULL ||
1803             card->state != DEV_STATE_UP)
1804                 /* The card isn't up. Ignore the packet. */
1805                 return;
1806
1807         skb = dev_alloc_skb(skb_len);
1808         if (skb == NULL) {
1809                 dev_err(&card->dev->dev,
1810                         " Allocating a socket buffer to interface %s failed\n",
1811                           card->dev->name);
1812                 card->stats.rx_dropped++;
1813                 return;
1814         }
1815         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1816         skb->protocol = card->lan_type_trans(skb, card->dev);
1817         card->stats.rx_bytes += skb_len;
1818         card->stats.rx_packets++;
1819         if (skb->protocol == htons(ETH_P_802_2))
1820                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1821         netif_rx(skb);
1822 }
1823
1824 /**
1825  * LCS main routine to get packets and lancmd replies from the buffers
1826  */
1827 static void
1828 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1829 {
1830         struct lcs_card *card;
1831         struct lcs_header *lcs_hdr;
1832         __u16 offset;
1833
1834         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1835         lcs_hdr = (struct lcs_header *) buffer->data;
1836         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1837                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1838                 return;
1839         }
1840         card = container_of(channel, struct lcs_card, read);
1841         offset = 0;
1842         while (lcs_hdr->offset != 0) {
1843                 if (lcs_hdr->offset <= 0 ||
1844                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1845                     lcs_hdr->offset < offset) {
1846                         /* Offset invalid. */
1847                         card->stats.rx_length_errors++;
1848                         card->stats.rx_errors++;
1849                         return;
1850                 }
1851                 /* What kind of frame is it? */
1852                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1853                         /* Control frame. */
1854                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1855                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1856                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1857                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1858                         /* Normal network packet. */
1859                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1860                                     lcs_hdr->offset - offset -
1861                                     sizeof(struct lcs_header));
1862                 else
1863                         /* Unknown frame type. */
1864                         ; // FIXME: error message ?
1865                 /* Proceed to next frame. */
1866                 offset = lcs_hdr->offset;
1867                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1868                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1869         }
1870         /* The buffer is now empty. Make it ready again. */
1871         lcs_ready_buffer(&card->read, buffer);
1872 }
1873
1874 /**
1875  * get network statistics for ifconfig and other user programs
1876  */
1877 static struct net_device_stats *
1878 lcs_getstats(struct net_device *dev)
1879 {
1880         struct lcs_card *card;
1881
1882         LCS_DBF_TEXT(4, trace, "netstats");
1883         card = (struct lcs_card *) dev->ml_priv;
1884         return &card->stats;
1885 }
1886
1887 /**
1888  * stop lcs device
1889  * This function will be called by user doing ifconfig xxx down
1890  */
1891 static int
1892 lcs_stop_device(struct net_device *dev)
1893 {
1894         struct lcs_card *card;
1895         int rc;
1896
1897         LCS_DBF_TEXT(2, trace, "stopdev");
1898         card   = (struct lcs_card *) dev->ml_priv;
1899         netif_carrier_off(dev);
1900         netif_tx_disable(dev);
1901         dev->flags &= ~IFF_UP;
1902         wait_event(card->write.wait_q,
1903                 (card->write.state != LCS_CH_STATE_RUNNING));
1904         rc = lcs_stopcard(card);
1905         if (rc)
1906                 dev_err(&card->dev->dev,
1907                         " Shutting down the LCS device failed\n ");
1908         return rc;
1909 }
1910
1911 /**
1912  * start lcs device and make it runnable
1913  * This function will be called by user doing ifconfig xxx up
1914  */
1915 static int
1916 lcs_open_device(struct net_device *dev)
1917 {
1918         struct lcs_card *card;
1919         int rc;
1920
1921         LCS_DBF_TEXT(2, trace, "opendev");
1922         card = (struct lcs_card *) dev->ml_priv;
1923         /* initialize statistics */
1924         rc = lcs_detect(card);
1925         if (rc) {
1926                 pr_err("Error in opening device!\n");
1927
1928         } else {
1929                 dev->flags |= IFF_UP;
1930                 netif_carrier_on(dev);
1931                 netif_wake_queue(dev);
1932                 card->state = DEV_STATE_UP;
1933         }
1934         return rc;
1935 }
1936
1937 /**
1938  * show function for portno called by cat or similar things
1939  */
1940 static ssize_t
1941 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1942 {
1943         struct lcs_card *card;
1944
1945         card = dev_get_drvdata(dev);
1946
1947         if (!card)
1948                 return 0;
1949
1950         return sprintf(buf, "%d\n", card->portno);
1951 }
1952
1953 /**
1954  * store the value which is piped to file portno
1955  */
1956 static ssize_t
1957 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1958 {
1959         struct lcs_card *card;
1960         int value;
1961
1962         card = dev_get_drvdata(dev);
1963
1964         if (!card)
1965                 return 0;
1966
1967         sscanf(buf, "%u", &value);
1968         /* TODO: sanity checks */
1969         card->portno = value;
1970
1971         return count;
1972
1973 }
1974
1975 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1976
1977 const char *lcs_type[] = {
1978         "not a channel",
1979         "2216 parallel",
1980         "2216 channel",
1981         "OSA LCS card",
1982         "unknown channel type",
1983         "unsupported channel type",
1984 };
1985
1986 static ssize_t
1987 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1988 {
1989         struct ccwgroup_device *cgdev;
1990
1991         cgdev = to_ccwgroupdev(dev);
1992         if (!cgdev)
1993                 return -ENODEV;
1994
1995         return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1996 }
1997
1998 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1999
2000 static ssize_t
2001 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
2002 {
2003         struct lcs_card *card;
2004
2005         card = dev_get_drvdata(dev);
2006
2007         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2008 }
2009
2010 static ssize_t
2011 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2012 {
2013         struct lcs_card *card;
2014         int value;
2015
2016         card = dev_get_drvdata(dev);
2017
2018         if (!card)
2019                 return 0;
2020
2021         sscanf(buf, "%u", &value);
2022         /* TODO: sanity checks */
2023         card->lancmd_timeout = value;
2024
2025         return count;
2026
2027 }
2028
2029 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2030
2031 static ssize_t
2032 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2033                       const char *buf, size_t count)
2034 {
2035         struct lcs_card *card = dev_get_drvdata(dev);
2036         char *tmp;
2037         int i;
2038
2039         if (!card)
2040                 return -EINVAL;
2041         if (card->state != DEV_STATE_UP)
2042                 return -EPERM;
2043         i = simple_strtoul(buf, &tmp, 16);
2044         if (i == 1)
2045                 lcs_schedule_recovery(card);
2046         return count;
2047 }
2048
2049 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2050
2051 static struct attribute * lcs_attrs[] = {
2052         &dev_attr_portno.attr,
2053         &dev_attr_type.attr,
2054         &dev_attr_lancmd_timeout.attr,
2055         &dev_attr_recover.attr,
2056         NULL,
2057 };
2058
2059 static struct attribute_group lcs_attr_group = {
2060         .attrs = lcs_attrs,
2061 };
2062
2063 /**
2064  * lcs_probe_device is called on establishing a new ccwgroup_device.
2065  */
2066 static int
2067 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2068 {
2069         struct lcs_card *card;
2070         int ret;
2071
2072         if (!get_device(&ccwgdev->dev))
2073                 return -ENODEV;
2074
2075         LCS_DBF_TEXT(2, setup, "add_dev");
2076         card = lcs_alloc_card();
2077         if (!card) {
2078                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2079                 put_device(&ccwgdev->dev);
2080                 return -ENOMEM;
2081         }
2082         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2083         if (ret) {
2084                 lcs_free_card(card);
2085                 put_device(&ccwgdev->dev);
2086                 return ret;
2087         }
2088         dev_set_drvdata(&ccwgdev->dev, card);
2089         ccwgdev->cdev[0]->handler = lcs_irq;
2090         ccwgdev->cdev[1]->handler = lcs_irq;
2091         card->gdev = ccwgdev;
2092         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2093         card->thread_start_mask = 0;
2094         card->thread_allowed_mask = 0;
2095         card->thread_running_mask = 0;
2096         return 0;
2097 }
2098
2099 static int
2100 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2101 {
2102         struct lcs_card *card;
2103
2104         LCS_DBF_TEXT(2, setup, "regnetdv");
2105         card = dev_get_drvdata(&ccwgdev->dev);
2106         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2107                 return 0;
2108         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2109         return register_netdev(card->dev);
2110 }
2111
2112 /**
2113  * lcs_new_device will be called by setting the group device online.
2114  */
2115 static const struct net_device_ops lcs_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 };
2121
2122 static const struct net_device_ops lcs_mc_netdev_ops = {
2123         .ndo_open               = lcs_open_device,
2124         .ndo_stop               = lcs_stop_device,
2125         .ndo_get_stats          = lcs_getstats,
2126         .ndo_start_xmit         = lcs_start_xmit,
2127         .ndo_set_multicast_list = lcs_set_multicast_list,
2128 };
2129
2130 static int
2131 lcs_new_device(struct ccwgroup_device *ccwgdev)
2132 {
2133         struct  lcs_card *card;
2134         struct net_device *dev=NULL;
2135         enum lcs_dev_states recover_state;
2136         int rc;
2137
2138         card = dev_get_drvdata(&ccwgdev->dev);
2139         if (!card)
2140                 return -ENODEV;
2141
2142         LCS_DBF_TEXT(2, setup, "newdev");
2143         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2144         card->read.ccwdev  = ccwgdev->cdev[0];
2145         card->write.ccwdev = ccwgdev->cdev[1];
2146
2147         recover_state = card->state;
2148         rc = ccw_device_set_online(card->read.ccwdev);
2149         if (rc)
2150                 goto out_err;
2151         rc = ccw_device_set_online(card->write.ccwdev);
2152         if (rc)
2153                 goto out_werr;
2154
2155         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2156
2157         lcs_setup_card(card);
2158         rc = lcs_detect(card);
2159         if (rc) {
2160                 LCS_DBF_TEXT(2, setup, "dtctfail");
2161                 dev_err(&card->dev->dev,
2162                         "Detecting a network adapter for LCS devices"
2163                         " failed with rc=%d (0x%x)\n", rc, rc);
2164                 lcs_stopcard(card);
2165                 goto out;
2166         }
2167         if (card->dev) {
2168                 LCS_DBF_TEXT(2, setup, "samedev");
2169                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2170                 goto netdev_out;
2171         }
2172         switch (card->lan_type) {
2173 #ifdef CONFIG_NET_ETHERNET
2174         case LCS_FRAME_TYPE_ENET:
2175                 card->lan_type_trans = eth_type_trans;
2176                 dev = alloc_etherdev(0);
2177                 break;
2178 #endif
2179 #ifdef CONFIG_TR
2180         case LCS_FRAME_TYPE_TR:
2181                 card->lan_type_trans = tr_type_trans;
2182                 dev = alloc_trdev(0);
2183                 break;
2184 #endif
2185 #ifdef CONFIG_FDDI
2186         case LCS_FRAME_TYPE_FDDI:
2187                 card->lan_type_trans = fddi_type_trans;
2188                 dev = alloc_fddidev(0);
2189                 break;
2190 #endif
2191         default:
2192                 LCS_DBF_TEXT(3, setup, "errinit");
2193                 pr_err(" Initialization failed\n");
2194                 goto out;
2195         }
2196         if (!dev)
2197                 goto out;
2198         card->dev = dev;
2199         card->dev->ml_priv = card;
2200         card->dev->netdev_ops = &lcs_netdev_ops;
2201         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2202 #ifdef CONFIG_IP_MULTICAST
2203         if (!lcs_check_multicast_support(card))
2204                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2205 #endif
2206 netdev_out:
2207         lcs_set_allowed_threads(card,0xffffffff);
2208         if (recover_state == DEV_STATE_RECOVER) {
2209                 lcs_set_multicast_list(card->dev);
2210                 card->dev->flags |= IFF_UP;
2211                 netif_carrier_on(card->dev);
2212                 netif_wake_queue(card->dev);
2213                 card->state = DEV_STATE_UP;
2214         } else {
2215                 lcs_stopcard(card);
2216         }
2217
2218         if (lcs_register_netdev(ccwgdev) != 0)
2219                 goto out;
2220
2221         /* Print out supported assists: IPv6 */
2222         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2223                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2224                 "with" : "without");
2225         /* Print out supported assist: Multicast */
2226         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2227                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2228                 "with" : "without");
2229         return 0;
2230 out:
2231
2232         ccw_device_set_offline(card->write.ccwdev);
2233 out_werr:
2234         ccw_device_set_offline(card->read.ccwdev);
2235 out_err:
2236         return -ENODEV;
2237 }
2238
2239 /**
2240  * lcs_shutdown_device, called when setting the group device offline.
2241  */
2242 static int
2243 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2244 {
2245         struct lcs_card *card;
2246         enum lcs_dev_states recover_state;
2247         int ret;
2248
2249         LCS_DBF_TEXT(3, setup, "shtdndev");
2250         card = dev_get_drvdata(&ccwgdev->dev);
2251         if (!card)
2252                 return -ENODEV;
2253         if (recovery_mode == 0) {
2254                 lcs_set_allowed_threads(card, 0);
2255                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2256                         return -ERESTARTSYS;
2257         }
2258         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2259         recover_state = card->state;
2260
2261         ret = lcs_stop_device(card->dev);
2262         ret = ccw_device_set_offline(card->read.ccwdev);
2263         ret = ccw_device_set_offline(card->write.ccwdev);
2264         if (recover_state == DEV_STATE_UP) {
2265                 card->state = DEV_STATE_RECOVER;
2266         }
2267         if (ret)
2268                 return ret;
2269         return 0;
2270 }
2271
2272 static int
2273 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2274 {
2275         return __lcs_shutdown_device(ccwgdev, 0);
2276 }
2277
2278 /**
2279  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2280  */
2281 static int
2282 lcs_recovery(void *ptr)
2283 {
2284         struct lcs_card *card;
2285         struct ccwgroup_device *gdev;
2286         int rc;
2287
2288         card = (struct lcs_card *) ptr;
2289
2290         LCS_DBF_TEXT(4, trace, "recover1");
2291         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2292                 return 0;
2293         LCS_DBF_TEXT(4, trace, "recover2");
2294         gdev = card->gdev;
2295         dev_warn(&gdev->dev,
2296                 "A recovery process has been started for the LCS device\n");
2297         rc = __lcs_shutdown_device(gdev, 1);
2298         rc = lcs_new_device(gdev);
2299         if (!rc)
2300                 pr_info("Device %s successfully recovered!\n",
2301                         card->dev->name);
2302         else
2303                 pr_info("Device %s could not be recovered!\n",
2304                         card->dev->name);
2305         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2306         return 0;
2307 }
2308
2309 /**
2310  * lcs_remove_device, free buffers and card
2311  */
2312 static void
2313 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2314 {
2315         struct lcs_card *card;
2316
2317         card = dev_get_drvdata(&ccwgdev->dev);
2318         if (!card)
2319                 return;
2320
2321         LCS_DBF_TEXT(3, setup, "remdev");
2322         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2323         if (ccwgdev->state == CCWGROUP_ONLINE) {
2324                 lcs_shutdown_device(ccwgdev);
2325         }
2326         if (card->dev)
2327                 unregister_netdev(card->dev);
2328         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2329         lcs_cleanup_card(card);
2330         lcs_free_card(card);
2331         put_device(&ccwgdev->dev);
2332 }
2333
2334 static int lcs_pm_suspend(struct lcs_card *card)
2335 {
2336         if (card->dev)
2337                 netif_device_detach(card->dev);
2338         lcs_set_allowed_threads(card, 0);
2339         lcs_wait_for_threads(card, 0xffffffff);
2340         if (card->state != DEV_STATE_DOWN)
2341                 __lcs_shutdown_device(card->gdev, 1);
2342         return 0;
2343 }
2344
2345 static int lcs_pm_resume(struct lcs_card *card)
2346 {
2347         int rc = 0;
2348
2349         if (card->state == DEV_STATE_RECOVER)
2350                 rc = lcs_new_device(card->gdev);
2351         if (card->dev)
2352                 netif_device_attach(card->dev);
2353         if (rc) {
2354                 dev_warn(&card->gdev->dev, "The lcs device driver "
2355                         "failed to recover the device\n");
2356         }
2357         return rc;
2358 }
2359
2360 static int lcs_prepare(struct ccwgroup_device *gdev)
2361 {
2362         return 0;
2363 }
2364
2365 static void lcs_complete(struct ccwgroup_device *gdev)
2366 {
2367         return;
2368 }
2369
2370 static int lcs_freeze(struct ccwgroup_device *gdev)
2371 {
2372         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2373         return lcs_pm_suspend(card);
2374 }
2375
2376 static int lcs_thaw(struct ccwgroup_device *gdev)
2377 {
2378         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2379         return lcs_pm_resume(card);
2380 }
2381
2382 static int lcs_restore(struct ccwgroup_device *gdev)
2383 {
2384         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2385         return lcs_pm_resume(card);
2386 }
2387
2388 static struct ccw_device_id lcs_ids[] = {
2389         {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2390         {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2391         {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2392         {},
2393 };
2394 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2395
2396 static struct ccw_driver lcs_ccw_driver = {
2397         .owner  = THIS_MODULE,
2398         .name   = "lcs",
2399         .ids    = lcs_ids,
2400         .probe  = ccwgroup_probe_ccwdev,
2401         .remove = ccwgroup_remove_ccwdev,
2402 };
2403
2404 /**
2405  * LCS ccwgroup driver registration
2406  */
2407 static struct ccwgroup_driver lcs_group_driver = {
2408         .owner       = THIS_MODULE,
2409         .name        = "lcs",
2410         .max_slaves  = 2,
2411         .driver_id   = 0xD3C3E2,
2412         .probe       = lcs_probe_device,
2413         .remove      = lcs_remove_device,
2414         .set_online  = lcs_new_device,
2415         .set_offline = lcs_shutdown_device,
2416         .prepare     = lcs_prepare,
2417         .complete    = lcs_complete,
2418         .freeze      = lcs_freeze,
2419         .thaw        = lcs_thaw,
2420         .restore     = lcs_restore,
2421 };
2422
2423 static ssize_t
2424 lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2425                        size_t count)
2426 {
2427         int err;
2428         err = ccwgroup_create_from_string(lcs_root_dev,
2429                                           lcs_group_driver.driver_id,
2430                                           &lcs_ccw_driver, 2, buf);
2431         return err ? err : count;
2432 }
2433
2434 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2435
2436 static struct attribute *lcs_group_attrs[] = {
2437         &driver_attr_group.attr,
2438         NULL,
2439 };
2440
2441 static struct attribute_group lcs_group_attr_group = {
2442         .attrs = lcs_group_attrs,
2443 };
2444
2445 static const struct attribute_group *lcs_group_attr_groups[] = {
2446         &lcs_group_attr_group,
2447         NULL,
2448 };
2449
2450 /**
2451  *  LCS Module/Kernel initialization function
2452  */
2453 static int
2454 __init lcs_init_module(void)
2455 {
2456         int rc;
2457
2458         pr_info("Loading %s\n", version);
2459         rc = lcs_register_debug_facility();
2460         LCS_DBF_TEXT(0, setup, "lcsinit");
2461         if (rc)
2462                 goto out_err;
2463         lcs_root_dev = root_device_register("lcs");
2464         rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2465         if (rc)
2466                 goto register_err;
2467         rc = ccw_driver_register(&lcs_ccw_driver);
2468         if (rc)
2469                 goto ccw_err;
2470         lcs_group_driver.driver.groups = lcs_group_attr_groups;
2471         rc = ccwgroup_driver_register(&lcs_group_driver);
2472         if (rc)
2473                 goto ccwgroup_err;
2474         return 0;
2475
2476 ccwgroup_err:
2477         ccw_driver_unregister(&lcs_ccw_driver);
2478 ccw_err:
2479         root_device_unregister(lcs_root_dev);
2480 register_err:
2481         lcs_unregister_debug_facility();
2482 out_err:
2483         pr_err("Initializing the lcs device driver failed\n");
2484         return rc;
2485 }
2486
2487
2488 /**
2489  *  LCS module cleanup function
2490  */
2491 static void
2492 __exit lcs_cleanup_module(void)
2493 {
2494         pr_info("Terminating lcs module.\n");
2495         LCS_DBF_TEXT(0, trace, "cleanup");
2496         driver_remove_file(&lcs_group_driver.driver,
2497                            &driver_attr_group);
2498         ccwgroup_driver_unregister(&lcs_group_driver);
2499         ccw_driver_unregister(&lcs_ccw_driver);
2500         root_device_unregister(lcs_root_dev);
2501         lcs_unregister_debug_facility();
2502 }
2503
2504 module_init(lcs_init_module);
2505 module_exit(lcs_cleanup_module);
2506
2507 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2508 MODULE_LICENSE("GPL");
2509