drivers/s390/net/lcs.c

   1 /*
   2  *  linux/drivers/s390/net/lcs.c
   3  *
   4  *  Linux for S/390 Lan Channel Station Network Driver
   5  *
   6  *  Copyright (C)  1999-2001 IBM Deutschland Entwicklung GmbH,
   7  *                           IBM Corporation
   8  *    Author(s): Original Code written by
   9  *                        DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
  10  *               Rewritten by
  11  *                        Frank Pavlic (pavlic@de.ibm.com) and
  12  *                        Martin Schwidefsky <schwidefsky@de.ibm.com>
  13  *
  14  *    $Revision: 1.85 $  $Date: 2004/08/04 11:05:43 $
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/if.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/trdevice.h>
  36 #include <linux/fddidevice.h>
  37 #include <linux/inetdevice.h>
  38 #include <linux/in.h>
  39 #include <linux/igmp.h>
  40 #include <linux/delay.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 #include "cu3088.h"
  52
  53
  54 #if !defined(CONFIG_NET_ETHERNET) && \
  55     !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
  56 #error Cannot compile lcs.c without some net devices switched on.
  57 #endif
  58
  59 /**
  60  * initialization string for output
  61  */
  62 #define VERSION_LCS_C  "$Revision: 1.85 $"
  63
  64 static char version[] __initdata = "LCS driver ("VERSION_LCS_C "/" VERSION_LCS_H ")";
  65 static char debug_buffer[255];
  66
  67 /**
  68  * Some prototypes.
  69  */
  70 static void lcs_tasklet(unsigned long);
  71 static void lcs_start_kernel_thread(struct lcs_card *card);
  72 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  73
  74 /**
  75  * Debug Facility Stuff
  76  */
  77 static debug_info_t *lcs_dbf_setup;
  78 static debug_info_t *lcs_dbf_trace;
  79
  80 /**
  81  *  LCS Debug Facility functions
  82  */
  83 static void
  84 lcs_unregister_debug_facility(void)
  85 {
  86         if (lcs_dbf_setup)
  87                 debug_unregister(lcs_dbf_setup);
  88         if (lcs_dbf_trace)
  89                 debug_unregister(lcs_dbf_trace);
  90 }
  91
  92 static int
  93 lcs_register_debug_facility(void)
  94 {
  95         lcs_dbf_setup = debug_register("lcs_setup", 1, 1, 8);
  96         lcs_dbf_trace = debug_register("lcs_trace", 1, 2, 8);
  97         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
  98                 PRINT_ERR("Not enough memory for debug facility.\n");
  99                 lcs_unregister_debug_facility();
 100                 return -ENOMEM;
 101         }
 102         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 103         debug_set_level(lcs_dbf_setup, 2);
 104         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 105         debug_set_level(lcs_dbf_trace, 2);
 106         return 0;
 107 }
 108
 109 /**
 110  * Allocate io buffers.
 111  */
 112 static int
 113 lcs_alloc_channel(struct lcs_channel *channel)
 114 {
 115         int cnt;
 116
 117         LCS_DBF_TEXT(2, setup, "ichalloc");
 118         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 119                 /* alloc memory fo iobuffer */
 120                 channel->iob[cnt].data = (void *)
 121                         kmalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 122                 if (channel->iob[cnt].data == NULL)
 123                         break;
 124                 memset(channel->iob[cnt].data, 0, LCS_IOBUFFERSIZE);
 125                 channel->iob[cnt].state = BUF_STATE_EMPTY;
 126         }
 127         if (cnt < LCS_NUM_BUFFS) {
 128                 /* Not all io buffers could be allocated. */
 129                 LCS_DBF_TEXT(2, setup, "echalloc");
 130                 while (cnt-- > 0)
 131                         kfree(channel->iob[cnt].data);
 132                 return -ENOMEM;
 133         }
 134         return 0;
 135 }
 136
 137 /**
 138  * Free io buffers.
 139  */
 140 static void
 141 lcs_free_channel(struct lcs_channel *channel)
 142 {
 143         int cnt;
 144
 145         LCS_DBF_TEXT(2, setup, "ichfree");
 146         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 147                 if (channel->iob[cnt].data != NULL)
 148                         kfree(channel->iob[cnt].data);
 149                 channel->iob[cnt].data = NULL;
 150         }
 151 }
 152
 153 /*
 154  * Cleanup channel.
 155  */
 156 static void
 157 lcs_cleanup_channel(struct lcs_channel *channel)
 158 {
 159         LCS_DBF_TEXT(3, setup, "cleanch");
 160         /* Kill write channel tasklets. */
 161         tasklet_kill(&channel->irq_tasklet);
 162         /* Free channel buffers. */
 163         lcs_free_channel(channel);
 164 }
 165
 166 /**
 167  * LCS free memory for card and channels.
 168  */
 169 static void
 170 lcs_free_card(struct lcs_card *card)
 171 {
 172         LCS_DBF_TEXT(2, setup, "remcard");
 173         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 174         kfree(card);
 175 }
 176
 177 /**
 178  * LCS alloc memory for card and channels
 179  */
 180 static struct lcs_card *
 181 lcs_alloc_card(void)
 182 {
 183         struct lcs_card *card;
 184         int rc;
 185
 186         LCS_DBF_TEXT(2, setup, "alloclcs");
 187
 188         card = kmalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 189         if (card == NULL)
 190                 return NULL;
 191         memset(card, 0, sizeof(struct lcs_card));
 192         card->lan_type = LCS_FRAME_TYPE_AUTO;
 193         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 194         /* Allocate io buffers for the read channel. */
 195         rc = lcs_alloc_channel(&card->read);
 196         if (rc){
 197                 LCS_DBF_TEXT(2, setup, "iccwerr");
 198                 lcs_free_card(card);
 199                 return NULL;
 200         }
 201         /* Allocate io buffers for the write channel. */
 202         rc = lcs_alloc_channel(&card->write);
 203         if (rc) {
 204                 LCS_DBF_TEXT(2, setup, "iccwerr");
 205                 lcs_cleanup_channel(&card->read);
 206                 lcs_free_card(card);
 207                 return NULL;
 208         }
 209
 210 #ifdef CONFIG_IP_MULTICAST
 211         INIT_LIST_HEAD(&card->ipm_list);
 212 #endif
 213         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 214         return card;
 215 }
 216
 217 /*
 218  * Setup read channel.
 219  */
 220 static void
 221 lcs_setup_read_ccws(struct lcs_card *card)
 222 {
 223         int cnt;
 224
 225         LCS_DBF_TEXT(2, setup, "ireadccw");
 226         /* Setup read ccws. */
 227         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 228         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 229                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 230                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 231                 card->read.ccws[cnt].flags =
 232                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 233                 /*
 234                  * Note: we have allocated the buffer with GFP_DMA, so
 235                  * we do not need to do set_normalized_cda.
 236                  */
 237                 card->read.ccws[cnt].cda =
 238                         (__u32) __pa(card->read.iob[cnt].data);
 239                 ((struct lcs_header *)
 240                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 241                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 242                 card->read.iob[cnt].state = BUF_STATE_READY;
 243                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 244         }
 245         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 246         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 247         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 248         /* Last ccw is a tic (transfer in channel). */
 249         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 250         card->read.ccws[LCS_NUM_BUFFS].cda =
 251                 (__u32) __pa(card->read.ccws);
 252         /* Setg initial state of the read channel. */
 253         card->read.state = CH_STATE_INIT;
 254
 255         card->read.io_idx = 0;
 256         card->read.buf_idx = 0;
 257 }
 258
 259 static void
 260 lcs_setup_read(struct lcs_card *card)
 261 {
 262         LCS_DBF_TEXT(3, setup, "initread");
 263
 264         lcs_setup_read_ccws(card);
 265         /* Initialize read channel tasklet. */
 266         card->read.irq_tasklet.data = (unsigned long) &card->read;
 267         card->read.irq_tasklet.func = lcs_tasklet;
 268         /* Initialize waitqueue. */
 269         init_waitqueue_head(&card->read.wait_q);
 270 }
 271
 272 /*
 273  * Setup write channel.
 274  */
 275 static void
 276 lcs_setup_write_ccws(struct lcs_card *card)
 277 {
 278         int cnt;
 279
 280         LCS_DBF_TEXT(3, setup, "iwritccw");
 281         /* Setup write ccws. */
 282         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 283         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 284                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 285                 card->write.ccws[cnt].count = 0;
 286                 card->write.ccws[cnt].flags =
 287                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 288                 /*
 289                  * Note: we have allocated the buffer with GFP_DMA, so
 290                  * we do not need to do set_normalized_cda.
 291                  */
 292                 card->write.ccws[cnt].cda =
 293                         (__u32) __pa(card->write.iob[cnt].data);
 294         }
 295         /* Last ccw is a tic (transfer in channel). */
 296         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 297         card->write.ccws[LCS_NUM_BUFFS].cda =
 298                 (__u32) __pa(card->write.ccws);
 299         /* Set initial state of the write channel. */
 300         card->read.state = CH_STATE_INIT;
 301
 302         card->write.io_idx = 0;
 303         card->write.buf_idx = 0;
 304 }
 305
 306 static void
 307 lcs_setup_write(struct lcs_card *card)
 308 {
 309         LCS_DBF_TEXT(3, setup, "initwrit");
 310
 311         lcs_setup_write_ccws(card);
 312         /* Initialize write channel tasklet. */
 313         card->write.irq_tasklet.data = (unsigned long) &card->write;
 314         card->write.irq_tasklet.func = lcs_tasklet;
 315         /* Initialize waitqueue. */
 316         init_waitqueue_head(&card->write.wait_q);
 317 }
 318
 319
 320
 321 /**
 322  * Initialize channels,card and state machines.
 323  */
 324 static void
 325 lcs_setup_card(struct lcs_card *card)
 326 {
 327         LCS_DBF_TEXT(2, setup, "initcard");
 328         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 329
 330         lcs_setup_read(card);
 331         lcs_setup_write(card);
 332         /* Set cards initial state. */
 333         card->state = DEV_STATE_DOWN;
 334         card->tx_buffer = NULL;
 335         card->tx_emitted = 0;
 336
 337         /* Initialize kernel thread task used for LGW commands. */
 338         INIT_WORK(&card->kernel_thread_starter,
 339                   (void *)lcs_start_kernel_thread,card);
 340         card->thread_mask = 0;
 341         spin_lock_init(&card->lock);
 342         spin_lock_init(&card->ipm_lock);
 343 #ifdef CONFIG_IP_MULTICAST
 344         INIT_LIST_HEAD(&card->ipm_list);
 345 #endif
 346         INIT_LIST_HEAD(&card->lancmd_waiters);
 347 }
 348
 349 /**
 350  * Cleanup channels,card and state machines.
 351  */
 352 static void
 353 lcs_cleanup_card(struct lcs_card *card)
 354 {
 355         struct list_head *l, *n;
 356         struct lcs_ipm_list *ipm_list;
 357
 358         LCS_DBF_TEXT(3, setup, "cleancrd");
 359         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 360 #ifdef  CONFIG_IP_MULTICAST
 361         /* Free multicast list. */
 362         list_for_each_safe(l, n, &card->ipm_list) {
 363                 ipm_list = list_entry(l, struct lcs_ipm_list, list);
 364                 list_del(&ipm_list->list);
 365                 kfree(ipm_list);
 366         }
 367 #endif
 368         if (card->dev != NULL)
 369                 free_netdev(card->dev);
 370         /* Cleanup channels. */
 371         lcs_cleanup_channel(&card->write);
 372         lcs_cleanup_channel(&card->read);
 373 }
 374
 375 /**
 376  * Start channel.
 377  */
 378 static int
 379 lcs_start_channel(struct lcs_channel *channel)
 380 {
 381         unsigned long flags;
 382         int rc;
 383
 384         LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id);
 385         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 386         rc = ccw_device_start(channel->ccwdev,
 387                               channel->ccws + channel->io_idx, 0, 0,
 388                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 389         if (rc == 0)
 390                 channel->state = CH_STATE_RUNNING;
 391         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 392         if (rc) {
 393                 LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id);
 394                 PRINT_ERR("Error in starting channel, rc=%d!\n", rc);
 395         }
 396         return rc;
 397 }
 398
 399 static int
 400 lcs_clear_channel(struct lcs_channel *channel)
 401 {
 402         unsigned long flags;
 403         int rc;
 404
 405         LCS_DBF_TEXT(4,trace,"clearch");
 406         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 407         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 408         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 409         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 410         if (rc) {
 411                 LCS_DBF_TEXT_(4,trace,"ecsc%s", channel->ccwdev->dev.bus_id);
 412                 return rc;
 413         }
 414         wait_event(channel->wait_q, (channel->state == CH_STATE_CLEARED));
 415         channel->state = CH_STATE_STOPPED;
 416         return rc;
 417 }
 418
 419
 420 /**
 421  * Stop channel.
 422  */
 423 static int
 424 lcs_stop_channel(struct lcs_channel *channel)
 425 {
 426         unsigned long flags;
 427         int rc;
 428
 429         if (channel->state == CH_STATE_STOPPED)
 430                 return 0;
 431         LCS_DBF_TEXT(4,trace,"haltsch");
 432         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 433         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 434         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 435         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 436         if (rc) {
 437                 LCS_DBF_TEXT_(4,trace,"ehsc%s", channel->ccwdev->dev.bus_id);
 438                 return rc;
 439         }
 440         /* Asynchronous halt initialted. Wait for its completion. */
 441         wait_event(channel->wait_q, (channel->state == CH_STATE_HALTED));
 442         lcs_clear_channel(channel);
 443         return 0;
 444 }
 445
 446 /**
 447  * start read and write channel
 448  */
 449 static int
 450 lcs_start_channels(struct lcs_card *card)
 451 {
 452         int rc;
 453
 454         LCS_DBF_TEXT(2, trace, "chstart");
 455         /* start read channel */
 456         rc = lcs_start_channel(&card->read);
 457         if (rc)
 458                 return rc;
 459         /* start write channel */
 460         rc = lcs_start_channel(&card->write);
 461         if (rc)
 462                 lcs_stop_channel(&card->read);
 463         return rc;
 464 }
 465
 466 /**
 467  * stop read and write channel
 468  */
 469 static int
 470 lcs_stop_channels(struct lcs_card *card)
 471 {
 472         LCS_DBF_TEXT(2, trace, "chhalt");
 473         lcs_stop_channel(&card->read);
 474         lcs_stop_channel(&card->write);
 475         return 0;
 476 }
 477
 478 /**
 479  * Get empty buffer.
 480  */
 481 static struct lcs_buffer *
 482 __lcs_get_buffer(struct lcs_channel *channel)
 483 {
 484         int index;
 485
 486         LCS_DBF_TEXT(5, trace, "_getbuff");
 487         index = channel->io_idx;
 488         do {
 489                 if (channel->iob[index].state == BUF_STATE_EMPTY) {
 490                         channel->iob[index].state = BUF_STATE_LOCKED;
 491                         return channel->iob + index;
 492                 }
 493                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 494         } while (index != channel->io_idx);
 495         return NULL;
 496 }
 497
 498 static struct lcs_buffer *
 499 lcs_get_buffer(struct lcs_channel *channel)
 500 {
 501         struct lcs_buffer *buffer;
 502         unsigned long flags;
 503
 504         LCS_DBF_TEXT(5, trace, "getbuff");
 505         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 506         buffer = __lcs_get_buffer(channel);
 507         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 508         return buffer;
 509 }
 510
 511 /**
 512  * Resume channel program if the channel is suspended.
 513  */
 514 static int
 515 __lcs_resume_channel(struct lcs_channel *channel)
 516 {
 517         int rc;
 518
 519         if (channel->state != CH_STATE_SUSPENDED)
 520                 return 0;
 521         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 522                 return 0;
 523         LCS_DBF_TEXT_(5, trace, "rsch%s", channel->ccwdev->dev.bus_id);
 524         rc = ccw_device_resume(channel->ccwdev);
 525         if (rc) {
 526                 LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id);
 527                 PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc);
 528         } else
 529                 channel->state = CH_STATE_RUNNING;
 530         return rc;
 531
 532 }
 533
 534 /**
 535  * Make a buffer ready for processing.
 536  */
 537 static inline void
 538 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 539 {
 540         int prev, next;
 541
 542         LCS_DBF_TEXT(5, trace, "rdybits");
 543         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 544         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 545         /* Check if we may clear the suspend bit of this buffer. */
 546         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 547                 /* Check if we have to set the PCI bit. */
 548                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 549                         /* Suspend bit of the previous buffer is not set. */
 550                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 551                 /* Suspend bit of the next buffer is set. */
 552                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 553         }
 554 }
 555
 556 static int
 557 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 558 {
 559         unsigned long flags;
 560         int index, rc;
 561
 562         LCS_DBF_TEXT(5, trace, "rdybuff");
 563         if (buffer->state != BUF_STATE_LOCKED &&
 564             buffer->state != BUF_STATE_PROCESSED)
 565                 BUG();
 566         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 567         buffer->state = BUF_STATE_READY;
 568         index = buffer - channel->iob;
 569         /* Set length. */
 570         channel->ccws[index].count = buffer->count;
 571         /* Check relevant PCI/suspend bits. */
 572         __lcs_ready_buffer_bits(channel, index);
 573         rc = __lcs_resume_channel(channel);
 574         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 575         return rc;
 576 }
 577
 578 /**
 579  * Mark the buffer as processed. Take care of the suspend bit
 580  * of the previous buffer. This function is called from
 581  * interrupt context, so the lock must not be taken.
 582  */
 583 static int
 584 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 585 {
 586         int index, prev, next;
 587
 588         LCS_DBF_TEXT(5, trace, "prcsbuff");
 589         if (buffer->state != BUF_STATE_READY)
 590                 BUG();
 591         buffer->state = BUF_STATE_PROCESSED;
 592         index = buffer - channel->iob;
 593         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 594         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 595         /* Set the suspend bit and clear the PCI bit of this buffer. */
 596         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 597         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 598         /* Check the suspend bit of the previous buffer. */
 599         if (channel->iob[prev].state == BUF_STATE_READY) {
 600                 /*
 601                  * Previous buffer is in state ready. It might have
 602                  * happened in lcs_ready_buffer that the suspend bit
 603                  * has not been cleared to avoid an endless loop.
 604                  * Do it now.
 605                  */
 606                 __lcs_ready_buffer_bits(channel, prev);
 607         }
 608         /* Clear PCI bit of next buffer. */
 609         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 610         return __lcs_resume_channel(channel);
 611 }
 612
 613 /**
 614  * Put a processed buffer back to state empty.
 615  */
 616 static void
 617 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 618 {
 619         unsigned long flags;
 620
 621         LCS_DBF_TEXT(5, trace, "relbuff");
 622         if (buffer->state != BUF_STATE_LOCKED &&
 623             buffer->state != BUF_STATE_PROCESSED)
 624                 BUG();
 625         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 626         buffer->state = BUF_STATE_EMPTY;
 627         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 628 }
 629
 630 /**
 631  * Get buffer for a lan command.
 632  */
 633 static struct lcs_buffer *
 634 lcs_get_lancmd(struct lcs_card *card, int count)
 635 {
 636         struct lcs_buffer *buffer;
 637         struct lcs_cmd *cmd;
 638
 639         LCS_DBF_TEXT(4, trace, "getlncmd");
 640         /* Get buffer and wait if none is available. */
 641         wait_event(card->write.wait_q,
 642                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 643         count += sizeof(struct lcs_header);
 644         *(__u16 *)(buffer->data + count) = 0;
 645         buffer->count = count + sizeof(__u16);
 646         buffer->callback = lcs_release_buffer;
 647         cmd = (struct lcs_cmd *) buffer->data;
 648         cmd->offset = count;
 649         cmd->type = LCS_FRAME_TYPE_CONTROL;
 650         cmd->slot = 0;
 651         return buffer;
 652 }
 653
 654 /**
 655  * Notifier function for lancmd replies. Called from read irq.
 656  */
 657 static void
 658 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 659 {
 660         struct list_head *l, *n;
 661         struct lcs_reply *reply;
 662
 663         LCS_DBF_TEXT(4, trace, "notiwait");
 664         spin_lock(&card->lock);
 665         list_for_each_safe(l, n, &card->lancmd_waiters) {
 666                 reply = list_entry(l, struct lcs_reply, list);
 667                 if (reply->sequence_no == cmd->sequence_no) {
 668                         list_del(&reply->list);
 669                         if (reply->callback != NULL)
 670                                 reply->callback(card, cmd);
 671                         reply->received = 1;
 672                         reply->rc = cmd->return_code;
 673                         wake_up(&reply->wait_q);
 674                         break;
 675                 }
 676         }
 677         spin_unlock(&card->lock);
 678 }
 679
 680 /**
 681  * Emit buffer of a lan comand.
 682  */
 683 void
 684 lcs_lancmd_timeout(unsigned long data)
 685 {
 686         struct lcs_reply *reply;
 687
 688         LCS_DBF_TEXT(4, trace, "timeout");
 689         reply = (struct lcs_reply *) data;
 690         list_del(&reply->list);
 691         reply->received = 1;
 692         reply->rc = -ETIME;
 693         wake_up(&reply->wait_q);
 694 }
 695
 696 static int
 697 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 698                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 699 {
 700         struct lcs_reply reply;
 701         struct lcs_cmd *cmd;
 702         struct timer_list timer;
 703         int rc;
 704
 705         LCS_DBF_TEXT(4, trace, "sendcmd");
 706         cmd = (struct lcs_cmd *) buffer->data;
 707         cmd->sequence_no = ++card->sequence_no;
 708         cmd->return_code = 0;
 709         reply.sequence_no = cmd->sequence_no;
 710         reply.callback = reply_callback;
 711         reply.received = 0;
 712         reply.rc = 0;
 713         init_waitqueue_head(&reply.wait_q);
 714         spin_lock(&card->lock);
 715         list_add_tail(&reply.list, &card->lancmd_waiters);
 716         spin_unlock(&card->lock);
 717         buffer->callback = lcs_release_buffer;
 718         rc = lcs_ready_buffer(&card->write, buffer);
 719         if (rc)
 720                 return rc;
 721         init_timer(&timer);
 722         timer.function = lcs_lancmd_timeout;
 723         timer.data = (unsigned long) &reply;
 724         timer.expires = jiffies + HZ*card->lancmd_timeout;
 725         add_timer(&timer);
 726         wait_event(reply.wait_q, reply.received);
 727         del_timer(&timer);
 728         LCS_DBF_TEXT_(4, trace, "rc:%d",reply.rc);
 729         return reply.rc ? -EIO : 0;
 730 }
 731
 732 /**
 733  * LCS startup command
 734  */
 735 static int
 736 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 737 {
 738         struct lcs_buffer *buffer;
 739         struct lcs_cmd *cmd;
 740
 741         LCS_DBF_TEXT(2, trace, "startup");
 742         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 743         cmd = (struct lcs_cmd *) buffer->data;
 744         cmd->cmd_code = LCS_CMD_STARTUP;
 745         cmd->initiator = initiator;
 746         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 747         return lcs_send_lancmd(card, buffer, NULL);
 748 }
 749
 750 /**
 751  * LCS shutdown command
 752  */
 753 static int
 754 lcs_send_shutdown(struct lcs_card *card)
 755 {
 756         struct lcs_buffer *buffer;
 757         struct lcs_cmd *cmd;
 758
 759         LCS_DBF_TEXT(2, trace, "shutdown");
 760         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 761         cmd = (struct lcs_cmd *) buffer->data;
 762         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 763         cmd->initiator = LCS_INITIATOR_TCPIP;
 764         return lcs_send_lancmd(card, buffer, NULL);
 765 }
 766
 767 /**
 768  * LCS lanstat command
 769  */
 770 static void
 771 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 772 {
 773         LCS_DBF_TEXT(2, trace, "statcb");
 774         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 775 }
 776
 777 static int
 778 lcs_send_lanstat(struct lcs_card *card)
 779 {
 780         struct lcs_buffer *buffer;
 781         struct lcs_cmd *cmd;
 782
 783         LCS_DBF_TEXT(2,trace, "cmdstat");
 784         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 785         cmd = (struct lcs_cmd *) buffer->data;
 786         /* Setup lanstat command. */
 787         cmd->cmd_code = LCS_CMD_LANSTAT;
 788         cmd->initiator = LCS_INITIATOR_TCPIP;
 789         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 790         cmd->cmd.lcs_std_cmd.portno = card->portno;
 791         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 792 }
 793
 794 /**
 795  * send stoplan command
 796  */
 797 static int
 798 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 799 {
 800         struct lcs_buffer *buffer;
 801         struct lcs_cmd *cmd;
 802
 803         LCS_DBF_TEXT(2, trace, "cmdstpln");
 804         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 805         cmd = (struct lcs_cmd *) buffer->data;
 806         cmd->cmd_code = LCS_CMD_STOPLAN;
 807         cmd->initiator = initiator;
 808         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 809         cmd->cmd.lcs_std_cmd.portno = card->portno;
 810         return lcs_send_lancmd(card, buffer, NULL);
 811 }
 812
 813 /**
 814  * send startlan command
 815  */
 816 static void
 817 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 818 {
 819         LCS_DBF_TEXT(2, trace, "srtlancb");
 820         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 821         card->portno = cmd->cmd.lcs_std_cmd.portno;
 822 }
 823
 824 static int
 825 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
 826 {
 827         struct lcs_buffer *buffer;
 828         struct lcs_cmd *cmd;
 829
 830         LCS_DBF_TEXT(2, trace, "cmdstaln");
 831         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 832         cmd = (struct lcs_cmd *) buffer->data;
 833         cmd->cmd_code = LCS_CMD_STARTLAN;
 834         cmd->initiator = initiator;
 835         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 836         cmd->cmd.lcs_std_cmd.portno = card->portno;
 837         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
 838 }
 839
 840 #ifdef CONFIG_IP_MULTICAST
 841 /**
 842  * send setipm command (Multicast)
 843  */
 844 static int
 845 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
 846 {
 847         struct lcs_buffer *buffer;
 848         struct lcs_cmd *cmd;
 849
 850         LCS_DBF_TEXT(2, trace, "cmdsetim");
 851         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
 852         cmd = (struct lcs_cmd *) buffer->data;
 853         cmd->cmd_code = LCS_CMD_SETIPM;
 854         cmd->initiator = LCS_INITIATOR_TCPIP;
 855         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
 856         cmd->cmd.lcs_qipassist.portno = card->portno;
 857         cmd->cmd.lcs_qipassist.version = 4;
 858         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
 859         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
 860                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
 861         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
 862         return lcs_send_lancmd(card, buffer, NULL);
 863 }
 864
 865 /**
 866  * send delipm command (Multicast)
 867  */
 868 static int
 869 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
 870 {
 871         struct lcs_buffer *buffer;
 872         struct lcs_cmd *cmd;
 873
 874         LCS_DBF_TEXT(2, trace, "cmddelim");
 875         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
 876         cmd = (struct lcs_cmd *) buffer->data;
 877         cmd->cmd_code = LCS_CMD_DELIPM;
 878         cmd->initiator = LCS_INITIATOR_TCPIP;
 879         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
 880         cmd->cmd.lcs_qipassist.portno = card->portno;
 881         cmd->cmd.lcs_qipassist.version = 4;
 882         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
 883         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
 884                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
 885         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
 886         return lcs_send_lancmd(card, buffer, NULL);
 887 }
 888
 889 /**
 890  * check if multicast is supported by LCS
 891  */
 892 static void
 893 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 894 {
 895         LCS_DBF_TEXT(2, trace, "chkmccb");
 896         card->ip_assists_supported =
 897                 cmd->cmd.lcs_qipassist.ip_assists_supported;
 898         card->ip_assists_enabled =
 899                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
 900 }
 901
 902 static int
 903 lcs_check_multicast_support(struct lcs_card *card)
 904 {
 905         struct lcs_buffer *buffer;
 906         struct lcs_cmd *cmd;
 907         int rc;
 908
 909         LCS_DBF_TEXT(2, trace, "cmdqipa");
 910         /* Send query ipassist. */
 911         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 912         cmd = (struct lcs_cmd *) buffer->data;
 913         cmd->cmd_code = LCS_CMD_QIPASSIST;
 914         cmd->initiator = LCS_INITIATOR_TCPIP;
 915         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
 916         cmd->cmd.lcs_qipassist.portno = card->portno;
 917         cmd->cmd.lcs_qipassist.version = 4;
 918         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
 919         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
 920         if (rc != 0) {
 921                 PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
 922                 return -EOPNOTSUPP;
 923         }
 924         /* Print out supported assists: IPv6 */
 925         PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
 926                    (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
 927                    "with" : "without");
 928         /* Print out supported assist: Multicast */
 929         PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
 930                    (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
 931                    "with" : "without");
 932         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
 933                 return 0;
 934         return -EOPNOTSUPP;
 935 }
 936
 937 /**
 938  * set or del multicast address on LCS card
 939  */
 940 static void
 941 lcs_fix_multicast_list(struct lcs_card *card)
 942 {
 943         struct list_head *l, *n;
 944         struct lcs_ipm_list *ipm;
 945
 946         LCS_DBF_TEXT(4,trace, "fixipm");
 947         spin_lock(&card->ipm_lock);
 948         list_for_each_safe(l, n, &card->ipm_list) {
 949                 ipm = list_entry(l, struct lcs_ipm_list, list);
 950                 switch (ipm->ipm_state) {
 951                 case LCS_IPM_STATE_SET_REQUIRED:
 952                         if (lcs_send_setipm(card, ipm))
 953                                 PRINT_INFO("Adding multicast address failed."
 954                                            "Table possibly full!\n");
 955                         else
 956                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
 957                         break;
 958                 case LCS_IPM_STATE_DEL_REQUIRED:
 959                         lcs_send_delipm(card, ipm);
 960                         list_del(&ipm->list);
 961                         kfree(ipm);
 962                         break;
 963                 case LCS_IPM_STATE_ON_CARD:
 964                         break;
 965                 }
 966         }
 967         if (card->state == DEV_STATE_UP)
 968                 netif_wake_queue(card->dev);
 969         spin_unlock(&card->ipm_lock);
 970 }
 971
 972 /**
 973  * get mac address for the relevant Multicast address
 974  */
 975 static void
 976 lcs_get_mac_for_ipm(__u32 ipm, char *mac, struct net_device *dev)
 977 {
 978         LCS_DBF_TEXT(4,trace, "getmac");
 979         if (dev->type == ARPHRD_IEEE802_TR)
 980                 ip_tr_mc_map(ipm, mac);
 981         else
 982                 ip_eth_mc_map(ipm, mac);
 983 }
 984
 985 /**
 986  * function called by net device to handle multicast address relevant things
 987  */
 988 static int
 989 lcs_register_mc_addresses(void *data)
 990 {
 991         struct lcs_card *card;
 992         char buf[MAX_ADDR_LEN];
 993         struct list_head *l;
 994         struct ip_mc_list *im4;
 995         struct in_device *in4_dev;
 996         struct lcs_ipm_list *ipm, *tmp;
 997
 998         daemonize("regipm");
 999         LCS_DBF_TEXT(4, trace, "regmulti");
1000
1001         card = (struct lcs_card *) data;
1002         in4_dev = in_dev_get(card->dev);
1003         if (in4_dev == NULL)
1004                 return 0;
1005         read_lock(&in4_dev->lock);
1006         spin_lock(&card->ipm_lock);
1007         /* Check for multicast addresses to be removed. */
1008         list_for_each(l, &card->ipm_list) {
1009                 ipm = list_entry(l, struct lcs_ipm_list, list);
1010                 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1011                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1012                         if (memcmp(buf, &ipm->ipm.mac_addr,
1013                                    LCS_MAC_LENGTH) == 0 &&
1014                             ipm->ipm.ip_addr == im4->multiaddr)
1015                                 break;
1016                 }
1017                 if (im4 == NULL)
1018                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1019         }
1020         /* Check for multicast addresses to be added. */
1021         for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1022                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1023                 ipm = NULL;
1024                 list_for_each(l, &card->ipm_list) {
1025                         tmp = list_entry(l, struct lcs_ipm_list, list);
1026                         if (memcmp(buf, &tmp->ipm.mac_addr,
1027                                    LCS_MAC_LENGTH) == 0 &&
1028                             tmp->ipm.ip_addr == im4->multiaddr) {
1029                                 ipm = tmp;
1030                                 break;
1031                         }
1032                 }
1033                 if (ipm != NULL)
1034                         continue;       /* Address already in list. */
1035                 ipm = (struct lcs_ipm_list *)
1036                         kmalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1037                 if (ipm == NULL) {
1038                         PRINT_INFO("Not enough memory to add "
1039                                    "new multicast entry!\n");
1040                         break;
1041                 }
1042                 memset(ipm, 0, sizeof(struct lcs_ipm_list));
1043                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1044                 ipm->ipm.ip_addr = im4->multiaddr;
1045                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1046                 list_add(&ipm->list, &card->ipm_list);
1047         }
1048         spin_unlock(&card->ipm_lock);
1049         read_unlock(&in4_dev->lock);
1050         in_dev_put(in4_dev);
1051         lcs_fix_multicast_list(card);
1052         return 0;
1053 }
1054 /**
1055  * function called by net device to
1056  * handle multicast address relevant things
1057  */
1058 static void
1059 lcs_set_multicast_list(struct net_device *dev)
1060 {
1061         struct lcs_card *card;
1062
1063         LCS_DBF_TEXT(4, trace, "setmulti");
1064         card = (struct lcs_card *) dev->priv;
1065         set_bit(3, &card->thread_mask);
1066         schedule_work(&card->kernel_thread_starter);
1067 }
1068
1069 #endif /* CONFIG_IP_MULTICAST */
1070
1071 static long
1072 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1073 {
1074         if (!IS_ERR(irb))
1075                 return 0;
1076
1077         switch (PTR_ERR(irb)) {
1078         case -EIO:
1079                 PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id);
1080                 LCS_DBF_TEXT(2, trace, "ckirberr");
1081                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1082                 break;
1083         case -ETIMEDOUT:
1084                 PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id);
1085                 LCS_DBF_TEXT(2, trace, "ckirberr");
1086                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1087                 break;
1088         default:
1089                 PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb),
1090                            cdev->dev.bus_id);
1091                 LCS_DBF_TEXT(2, trace, "ckirberr");
1092                 LCS_DBF_TEXT(2, trace, "  rc???");
1093         }
1094         return PTR_ERR(irb);
1095 }
1096
1097
1098 /**
1099  * IRQ Handler for LCS channels
1100  */
1101 static void
1102 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1103 {
1104         struct lcs_card *card;
1105         struct lcs_channel *channel;
1106         int index;
1107
1108         if (lcs_check_irb_error(cdev, irb))
1109                 return;
1110
1111         card = CARD_FROM_DEV(cdev);
1112         if (card->read.ccwdev == cdev)
1113                 channel = &card->read;
1114         else
1115                 channel = &card->write;
1116
1117         LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
1118         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat);
1119
1120         /* How far in the ccw chain have we processed? */
1121         if ((channel->state != CH_STATE_INIT) &&
1122             (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
1123                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa)
1124                         - channel->ccws;
1125                 if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) ||
1126                     (irb->scsw.cstat | SCHN_STAT_PCI))
1127                         /* Bloody io subsystem tells us lies about cpa... */
1128                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1129                 while (channel->io_idx != index) {
1130                         __lcs_processed_buffer(channel,
1131                                                channel->iob + channel->io_idx);
1132                         channel->io_idx =
1133                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1134                 }
1135         }
1136
1137         if ((irb->scsw.dstat & DEV_STAT_DEV_END) ||
1138             (irb->scsw.dstat & DEV_STAT_CHN_END) ||
1139             (irb->scsw.dstat & DEV_STAT_UNIT_CHECK))
1140                 /* Mark channel as stopped. */
1141                 channel->state = CH_STATE_STOPPED;
1142         else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED)
1143                 /* CCW execution stopped on a suspend bit. */
1144                 channel->state = CH_STATE_SUSPENDED;
1145
1146         if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1147                 if (irb->scsw.cc != 0) {
1148                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1149                         return;
1150                 }
1151                 /* The channel has been stopped by halt_IO. */
1152                 channel->state = CH_STATE_HALTED;
1153         }
1154
1155         if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
1156                 channel->state = CH_STATE_CLEARED;
1157         }
1158         /* Do the rest in the tasklet. */
1159         tasklet_schedule(&channel->irq_tasklet);
1160 }
1161
1162 /**
1163  * Tasklet for IRQ handler
1164  */
1165 static void
1166 lcs_tasklet(unsigned long data)
1167 {
1168         unsigned long flags;
1169         struct lcs_channel *channel;
1170         struct lcs_buffer *iob;
1171         int buf_idx;
1172         int rc;
1173
1174         channel = (struct lcs_channel *) data;
1175         LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);
1176
1177         /* Check for processed buffers. */
1178         iob = channel->iob;
1179         buf_idx = channel->buf_idx;
1180         while (iob[buf_idx].state == BUF_STATE_PROCESSED) {
1181                 /* Do the callback thing. */
1182                 if (iob[buf_idx].callback != NULL)
1183                         iob[buf_idx].callback(channel, iob + buf_idx);
1184                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1185         }
1186         channel->buf_idx = buf_idx;
1187
1188         if (channel->state == CH_STATE_STOPPED)
1189                 // FIXME: what if rc != 0 ??
1190                 rc = lcs_start_channel(channel);
1191         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1192         if (channel->state == CH_STATE_SUSPENDED &&
1193             channel->iob[channel->io_idx].state == BUF_STATE_READY) {
1194                 // FIXME: what if rc != 0 ??
1195                 rc = __lcs_resume_channel(channel);
1196         }
1197         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1198
1199         /* Something happened on the channel. Wake up waiters. */
1200         wake_up(&channel->wait_q);
1201 }
1202
1203 /**
1204  * Finish current tx buffer and make it ready for transmit.
1205  */
1206 static void
1207 __lcs_emit_txbuffer(struct lcs_card *card)
1208 {
1209         LCS_DBF_TEXT(5, trace, "emittx");
1210         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1211         card->tx_buffer->count += 2;
1212         lcs_ready_buffer(&card->write, card->tx_buffer);
1213         card->tx_buffer = NULL;
1214         card->tx_emitted++;
1215 }
1216
1217 /**
1218  * Callback for finished tx buffers.
1219  */
1220 static void
1221 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1222 {
1223         struct lcs_card *card;
1224
1225         LCS_DBF_TEXT(5, trace, "txbuffcb");
1226         /* Put buffer back to pool. */
1227         lcs_release_buffer(channel, buffer);
1228         card = (struct lcs_card *)
1229                 ((char *) channel - offsetof(struct lcs_card, write));
1230         spin_lock(&card->lock);
1231         card->tx_emitted--;
1232         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1233                 /*
1234                  * Last running tx buffer has finished. Submit partially
1235                  * filled current buffer.
1236                  */
1237                 __lcs_emit_txbuffer(card);
1238         spin_unlock(&card->lock);
1239 }
1240
1241 /**
1242  * Packet transmit function called by network stack
1243  */
1244 static int
1245 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1246                  struct net_device *dev)
1247 {
1248         struct lcs_header *header;
1249
1250         LCS_DBF_TEXT(5, trace, "hardxmit");
1251         if (skb == NULL) {
1252                 card->stats.tx_dropped++;
1253                 card->stats.tx_errors++;
1254                 return -EIO;
1255         }
1256         if (card->state != DEV_STATE_UP) {
1257                 dev_kfree_skb(skb);
1258                 card->stats.tx_dropped++;
1259                 card->stats.tx_errors++;
1260                 card->stats.tx_carrier_errors++;
1261                 return 0;
1262         }
1263         if (netif_queue_stopped(dev) ) {
1264                 card->stats.tx_dropped++;
1265                 return -EBUSY;
1266         }
1267         if (card->tx_buffer != NULL &&
1268             card->tx_buffer->count + sizeof(struct lcs_header) +
1269             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1270                 /* skb too big for current tx buffer. */
1271                 __lcs_emit_txbuffer(card);
1272         if (card->tx_buffer == NULL) {
1273                 /* Get new tx buffer */
1274                 card->tx_buffer = lcs_get_buffer(&card->write);
1275                 if (card->tx_buffer == NULL) {
1276                         card->stats.tx_dropped++;
1277                         return -EBUSY;
1278                 }
1279                 card->tx_buffer->callback = lcs_txbuffer_cb;
1280                 card->tx_buffer->count = 0;
1281         }
1282         header = (struct lcs_header *)
1283                 (card->tx_buffer->data + card->tx_buffer->count);
1284         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1285         header->offset = card->tx_buffer->count;
1286         header->type = card->lan_type;
1287         header->slot = card->portno;
1288         memcpy(header + 1, skb->data, skb->len);
1289         card->stats.tx_bytes += skb->len;
1290         card->stats.tx_packets++;
1291         dev_kfree_skb(skb);
1292         if (card->tx_emitted <= 0)
1293                 /* If this is the first tx buffer emit it immediately. */
1294                 __lcs_emit_txbuffer(card);
1295         return 0;
1296 }
1297
1298 static int
1299 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1300 {
1301         struct lcs_card *card;
1302         int rc;
1303
1304         LCS_DBF_TEXT(5, trace, "pktxmit");
1305         card = (struct lcs_card *) dev->priv;
1306         spin_lock(&card->lock);
1307         rc = __lcs_start_xmit(card, skb, dev);
1308         spin_unlock(&card->lock);
1309         return rc;
1310 }
1311
1312 /**
1313  * send startlan and lanstat command to make LCS device ready
1314  */
1315 static int
1316 lcs_startlan_auto(struct lcs_card *card)
1317 {
1318         int rc;
1319
1320         LCS_DBF_TEXT(2, trace, "strtauto");
1321 #ifdef CONFIG_NET_ETHERNET
1322         card->lan_type = LCS_FRAME_TYPE_ENET;
1323         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1324         if (rc == 0)
1325                 return 0;
1326
1327 #endif
1328 #ifdef CONFIG_TR
1329         card->lan_type = LCS_FRAME_TYPE_TR;
1330         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1331         if (rc == 0)
1332                 return 0;
1333 #endif
1334 #ifdef CONFIG_FDDI
1335         card->lan_type = LCS_FRAME_TYPE_FDDI;
1336         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1337         if (rc == 0)
1338                 return 0;
1339 #endif
1340         return -EIO;
1341 }
1342
1343 static int
1344 lcs_startlan(struct lcs_card *card)
1345 {
1346         int rc, i;
1347
1348         LCS_DBF_TEXT(2, trace, "startlan");
1349         rc = 0;
1350         if (card->portno != LCS_INVALID_PORT_NO) {
1351                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1352                         rc = lcs_startlan_auto(card);
1353                 else
1354                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1355         } else {
1356                 for (i = 0; i <= 16; i++) {
1357                         card->portno = i;
1358                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1359                                 rc = lcs_send_startlan(card,
1360                                                        LCS_INITIATOR_TCPIP);
1361                         else
1362                                 /* autodetecting lan type */
1363                                 rc = lcs_startlan_auto(card);
1364                         if (rc == 0)
1365                                 break;
1366                 }
1367         }
1368         if (rc == 0)
1369                 return lcs_send_lanstat(card);
1370         return rc;
1371 }
1372
1373 /**
1374  * LCS detect function
1375  * setup channels and make them I/O ready
1376  */
1377 static int
1378 lcs_detect(struct lcs_card *card)
1379 {
1380         int rc = 0;
1381
1382         LCS_DBF_TEXT(2, setup, "lcsdetct");
1383         /* start/reset card */
1384         if (card->dev)
1385                 netif_stop_queue(card->dev);
1386         card->write.state = CH_STATE_INIT;
1387         card->read.state = CH_STATE_INIT;
1388         rc = lcs_stop_channels(card);
1389         if (rc == 0) {
1390                 rc = lcs_start_channels(card);
1391                 if (rc == 0) {
1392                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1393                         if (rc == 0)
1394                                 rc = lcs_startlan(card);
1395                 }
1396         }
1397         if (rc == 0) {
1398                 card->state = DEV_STATE_UP;
1399         } else {
1400                 card->state = DEV_STATE_DOWN;
1401                 card->write.state = CH_STATE_INIT;
1402                 card->read.state =  CH_STATE_INIT;
1403         }
1404         return rc;
1405 }
1406
1407 /**
1408  * reset card
1409  */
1410 static int
1411 lcs_resetcard(struct lcs_card *card)
1412 {
1413         int retries;
1414
1415         LCS_DBF_TEXT(2, trace, "rescard");
1416         for (retries = 0; retries < 10; retries++) {
1417                 if (lcs_detect(card) == 0) {
1418                         netif_wake_queue(card->dev);
1419                         card->state = DEV_STATE_UP;
1420                         PRINT_INFO("LCS device %s successfully restarted!\n",
1421                                    card->dev->name);
1422                         return 0;
1423                 }
1424                 msleep(3000);
1425         }
1426         PRINT_ERR("Error in Reseting LCS card!\n");
1427         return -EIO;
1428 }
1429
1430 /**
1431  * LCS Stop card
1432  */
1433 static int
1434 lcs_stopcard(struct lcs_card *card)
1435 {
1436         int rc;
1437
1438         LCS_DBF_TEXT(3, setup, "stopcard");
1439
1440         if (card->read.state != CH_STATE_STOPPED &&
1441             card->write.state != CH_STATE_STOPPED &&
1442             card->state == DEV_STATE_UP) {
1443                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1444                 rc = lcs_send_shutdown(card);
1445         }
1446         rc = lcs_stop_channels(card);
1447         card->state = DEV_STATE_DOWN;
1448
1449         return rc;
1450 }
1451
1452 /**
1453  * LGW initiated commands
1454  */
1455 static int
1456 lcs_lgw_startlan_thread(void *data)
1457 {
1458         struct lcs_card *card;
1459
1460         card = (struct lcs_card *) data;
1461         daemonize("lgwstpln");
1462         LCS_DBF_TEXT(4, trace, "lgwstpln");
1463         if (card->dev)
1464                 netif_stop_queue(card->dev);
1465         if (lcs_startlan(card) == 0) {
1466                 netif_wake_queue(card->dev);
1467                 card->state = DEV_STATE_UP;
1468                 PRINT_INFO("LCS Startlan for device %s succeeded!\n",
1469                            card->dev->name);
1470
1471         } else
1472                 PRINT_ERR("LCS Startlan for device %s failed!\n",
1473                           card->dev->name);
1474         return 0;
1475 }
1476
1477 /**
1478  * Send startup command initiated by Lan Gateway
1479  */
1480 static int
1481 lcs_lgw_startup_thread(void *data)
1482 {
1483         int rc;
1484
1485         struct lcs_card *card;
1486
1487         card = (struct lcs_card *) data;
1488         daemonize("lgwstpln");
1489         LCS_DBF_TEXT(4, trace, "lgwstpln");
1490         if (card->dev)
1491                 netif_stop_queue(card->dev);
1492         rc = lcs_send_startup(card, LCS_INITIATOR_LGW);
1493         if (rc != 0) {
1494                 PRINT_ERR("Startup for LCS device %s initiated " \
1495                           "by LGW failed!\nReseting card ...\n",
1496                           card->dev->name);
1497                 /* do a card reset */
1498                 rc = lcs_resetcard(card);
1499                 if (rc == 0)
1500                         goto Done;
1501         }
1502         rc = lcs_startlan(card);
1503         if (rc == 0) {
1504                 netif_wake_queue(card->dev);
1505                 card->state = DEV_STATE_UP;
1506         }
1507 Done:
1508         if (rc == 0)
1509                 PRINT_INFO("LCS Startup for device %s succeeded!\n",
1510                            card->dev->name);
1511         else
1512                 PRINT_ERR("LCS Startup for device %s failed!\n",
1513                           card->dev->name);
1514         return 0;
1515 }
1516
1517
1518 /**
1519  * send stoplan command initiated by Lan Gateway
1520  */
1521 static int
1522 lcs_lgw_stoplan_thread(void *data)
1523 {
1524         struct lcs_card *card;
1525         int rc;
1526
1527         card = (struct lcs_card *) data;
1528         daemonize("lgwstop");
1529         LCS_DBF_TEXT(4, trace, "lgwstop");
1530         if (card->dev)
1531                 netif_stop_queue(card->dev);
1532         if (lcs_send_stoplan(card, LCS_INITIATOR_LGW) == 0)
1533                 PRINT_INFO("Stoplan for %s initiated by LGW succeeded!\n",
1534                            card->dev->name);
1535         else
1536                 PRINT_ERR("Stoplan %s initiated by LGW failed!\n",
1537                           card->dev->name);
1538         /*Try to reset the card, stop it on failure */
1539         rc = lcs_resetcard(card);
1540         if (rc != 0)
1541                 rc = lcs_stopcard(card);
1542         return rc;
1543 }
1544
1545 /**
1546  * Kernel Thread helper functions for LGW initiated commands
1547  */
1548 static void
1549 lcs_start_kernel_thread(struct lcs_card *card)
1550 {
1551         LCS_DBF_TEXT(5, trace, "krnthrd");
1552         if (test_and_clear_bit(0, &card->thread_mask))
1553                 kernel_thread(lcs_lgw_startup_thread, (void *) card, SIGCHLD);
1554         if (test_and_clear_bit(1, &card->thread_mask))
1555                 kernel_thread(lcs_lgw_startlan_thread, (void *) card, SIGCHLD);
1556         if (test_and_clear_bit(2, &card->thread_mask))
1557                 kernel_thread(lcs_lgw_stoplan_thread, (void *) card, SIGCHLD);
1558 #ifdef CONFIG_IP_MULTICAST
1559         if (test_and_clear_bit(3, &card->thread_mask))
1560                 kernel_thread(lcs_register_mc_addresses, (void *) card, SIGCHLD);
1561 #endif
1562 }
1563
1564 /**
1565  * Process control frames.
1566  */
1567 static void
1568 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1569 {
1570         LCS_DBF_TEXT(5, trace, "getctrl");
1571         if (cmd->initiator == LCS_INITIATOR_LGW) {
1572                 switch(cmd->cmd_code) {
1573                 case LCS_CMD_STARTUP:
1574                         set_bit(0, &card->thread_mask);
1575                         schedule_work(&card->kernel_thread_starter);
1576                         break;
1577                 case LCS_CMD_STARTLAN:
1578                         set_bit(1, &card->thread_mask);
1579                         schedule_work(&card->kernel_thread_starter);
1580                         break;
1581                 case LCS_CMD_STOPLAN:
1582                         set_bit(2, &card->thread_mask);
1583                         schedule_work(&card->kernel_thread_starter);
1584                         break;
1585                 default:
1586                         PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
1587                         break;
1588                 }
1589         } else
1590                 lcs_notify_lancmd_waiters(card, cmd);
1591 }
1592
1593 /**
1594  * Unpack network packet.
1595  */
1596 static void
1597 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1598 {
1599         struct sk_buff *skb;
1600
1601         LCS_DBF_TEXT(5, trace, "getskb");
1602         if (card->dev == NULL ||
1603             card->state != DEV_STATE_UP)
1604                 /* The card isn't up. Ignore the packet. */
1605                 return;
1606
1607         skb = dev_alloc_skb(skb_len);
1608         if (skb == NULL) {
1609                 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1610                           card->dev->name);
1611                 card->stats.rx_dropped++;
1612                 return;
1613         }
1614         skb->dev = card->dev;
1615         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1616         skb->protocol = card->lan_type_trans(skb, card->dev);
1617         card->stats.rx_bytes += skb_len;
1618         card->stats.rx_packets++;
1619         netif_rx(skb);
1620 }
1621
1622 /**
1623  * LCS main routine to get packets and lancmd replies from the buffers
1624  */
1625 static void
1626 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1627 {
1628         struct lcs_card *card;
1629         struct lcs_header *lcs_hdr;
1630         __u16 offset;
1631
1632         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1633         lcs_hdr = (struct lcs_header *) buffer->data;
1634         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1635                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1636                 return;
1637         }
1638         card = (struct lcs_card *)
1639                 ((char *) channel - offsetof(struct lcs_card, read));
1640         offset = 0;
1641         while (lcs_hdr->offset != 0) {
1642                 if (lcs_hdr->offset <= 0 ||
1643                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1644                     lcs_hdr->offset < offset) {
1645                         /* Offset invalid. */
1646                         card->stats.rx_length_errors++;
1647                         card->stats.rx_errors++;
1648                         return;
1649                 }
1650                 /* What kind of frame is it? */
1651                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1652                         /* Control frame. */
1653                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1654                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1655                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1656                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1657                         /* Normal network packet. */
1658                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1659                                     lcs_hdr->offset - offset -
1660                                     sizeof(struct lcs_header));
1661                 else
1662                         /* Unknown frame type. */
1663                         ; // FIXME: error message ?
1664                 /* Proceed to next frame. */
1665                 offset = lcs_hdr->offset;
1666                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1667                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1668         }
1669         /* The buffer is now empty. Make it ready again. */
1670         lcs_ready_buffer(&card->read, buffer);
1671 }
1672
1673 /**
1674  * get network statistics for ifconfig and other user programs
1675  */
1676 static struct net_device_stats *
1677 lcs_getstats(struct net_device *dev)
1678 {
1679         struct lcs_card *card;
1680
1681         LCS_DBF_TEXT(4, trace, "netstats");
1682         card = (struct lcs_card *) dev->priv;
1683         return &card->stats;
1684 }
1685
1686 /**
1687  * stop lcs device
1688  * This function will be called by user doing ifconfig xxx down
1689  */
1690 static int
1691 lcs_stop_device(struct net_device *dev)
1692 {
1693         struct lcs_card *card;
1694         int rc;
1695
1696         LCS_DBF_TEXT(2, trace, "stopdev");
1697         card   = (struct lcs_card *) dev->priv;
1698         netif_stop_queue(dev);
1699         dev->flags &= ~IFF_UP;
1700         rc = lcs_stopcard(card);
1701         if (rc)
1702                 PRINT_ERR("Try it again!\n ");
1703         return rc;
1704 }
1705
1706 /**
1707  * start lcs device and make it runnable
1708  * This function will be called by user doing ifconfig xxx up
1709  */
1710 static int
1711 lcs_open_device(struct net_device *dev)
1712 {
1713         struct lcs_card *card;
1714         int rc;
1715
1716         LCS_DBF_TEXT(2, trace, "opendev");
1717         card = (struct lcs_card *) dev->priv;
1718         /* initialize statistics */
1719         rc = lcs_detect(card);
1720         if (rc) {
1721                 PRINT_ERR("LCS:Error in opening device!\n");
1722
1723         } else {
1724                 dev->flags |= IFF_UP;
1725                 netif_wake_queue(dev);
1726                 card->state = DEV_STATE_UP;
1727         }
1728         return rc;
1729 }
1730
1731 /**
1732  * show function for portno called by cat or similar things
1733  */
1734 static ssize_t
1735 lcs_portno_show (struct device *dev, char *buf)
1736 {
1737         struct lcs_card *card;
1738
1739         card = (struct lcs_card *)dev->driver_data;
1740
1741         if (!card)
1742                 return 0;
1743
1744         return sprintf(buf, "%d\n", card->portno);
1745 }
1746
1747 /**
1748  * store the value which is piped to file portno
1749  */
1750 static ssize_t
1751 lcs_portno_store (struct device *dev, const char *buf, size_t count)
1752 {
1753         struct lcs_card *card;
1754         int value;
1755
1756         card = (struct lcs_card *)dev->driver_data;
1757
1758         if (!card)
1759                 return 0;
1760
1761         sscanf(buf, "%u", &value);
1762         /* TODO: sanity checks */
1763         card->portno = value;
1764
1765         return count;
1766
1767 }
1768
1769 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1770
1771 static ssize_t
1772 lcs_type_show(struct device *dev, char *buf)
1773 {
1774         struct ccwgroup_device *cgdev;
1775
1776         cgdev = to_ccwgroupdev(dev);
1777         if (!cgdev)
1778                 return -ENODEV;
1779
1780         return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
1781 }
1782
1783 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1784
1785 static ssize_t
1786 lcs_timeout_show(struct device *dev, char *buf)
1787 {
1788         struct lcs_card *card;
1789
1790         card = (struct lcs_card *)dev->driver_data;
1791
1792         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1793 }
1794
1795 static ssize_t
1796 lcs_timeout_store (struct device *dev, const char *buf, size_t count)
1797 {
1798         struct lcs_card *card;
1799         int value;
1800
1801         card = (struct lcs_card *)dev->driver_data;
1802
1803         if (!card)
1804                 return 0;
1805
1806         sscanf(buf, "%u", &value);
1807         /* TODO: sanity checks */
1808         card->lancmd_timeout = value;
1809
1810         return count;
1811
1812 }
1813
1814 DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1815
1816 static struct attribute * lcs_attrs[] = {
1817         &dev_attr_portno.attr,
1818         &dev_attr_type.attr,
1819         &dev_attr_lancmd_timeout.attr,
1820         NULL,
1821 };
1822
1823 static struct attribute_group lcs_attr_group = {
1824         .attrs = lcs_attrs,
1825 };
1826
1827 /**
1828  * lcs_probe_device is called on establishing a new ccwgroup_device.
1829  */
1830 static int
1831 lcs_probe_device(struct ccwgroup_device *ccwgdev)
1832 {
1833         struct lcs_card *card;
1834         int ret;
1835
1836         if (!get_device(&ccwgdev->dev))
1837                 return -ENODEV;
1838
1839         LCS_DBF_TEXT(2, setup, "add_dev");
1840         card = lcs_alloc_card();
1841         if (!card) {
1842                 PRINT_ERR("Allocation of lcs card failed\n");
1843                 put_device(&ccwgdev->dev);
1844                 return -ENOMEM;
1845         }
1846         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
1847         if (ret) {
1848                 PRINT_ERR("Creating attributes failed");
1849                 lcs_free_card(card);
1850                 put_device(&ccwgdev->dev);
1851                 return ret;
1852         }
1853         ccwgdev->dev.driver_data = card;
1854         ccwgdev->cdev[0]->handler = lcs_irq;
1855         ccwgdev->cdev[1]->handler = lcs_irq;
1856         return 0;
1857 }
1858
1859 static int
1860 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
1861 {
1862         struct lcs_card *card;
1863
1864         LCS_DBF_TEXT(2, setup, "regnetdv");
1865         card = (struct lcs_card *)ccwgdev->dev.driver_data;
1866         if (card->dev->reg_state != NETREG_UNINITIALIZED)
1867                 return 0;
1868         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
1869         return register_netdev(card->dev);
1870 }
1871
1872 /**
1873  * lcs_new_device will be called by setting the group device online.
1874  */
1875
1876 static int
1877 lcs_new_device(struct ccwgroup_device *ccwgdev)
1878 {
1879         struct  lcs_card *card;
1880         struct net_device *dev=NULL;
1881         enum lcs_dev_states recover_state;
1882         int rc;
1883
1884         card = (struct lcs_card *)ccwgdev->dev.driver_data;
1885         if (!card)
1886                 return -ENODEV;
1887
1888         LCS_DBF_TEXT(2, setup, "newdev");
1889         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
1890         card->read.ccwdev  = ccwgdev->cdev[0];
1891         card->write.ccwdev = ccwgdev->cdev[1];
1892
1893         recover_state = card->state;
1894         ccw_device_set_online(card->read.ccwdev);
1895         ccw_device_set_online(card->write.ccwdev);
1896
1897         LCS_DBF_TEXT(3, setup, "lcsnewdv");
1898
1899         lcs_setup_card(card);
1900         rc = lcs_detect(card);
1901         if (rc) {
1902                 LCS_DBF_TEXT(2, setup, "dtctfail");
1903                 PRINT_WARN("Detection of LCS card failed with return code "
1904                            "%d (0x%x)\n", rc, rc);
1905                 lcs_stopcard(card);
1906                 goto out;
1907         }
1908         if (card->dev) {
1909                 LCS_DBF_TEXT(2, setup, "samedev");
1910                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
1911                 goto netdev_out;
1912         }
1913         switch (card->lan_type) {
1914 #ifdef CONFIG_NET_ETHERNET
1915         case LCS_FRAME_TYPE_ENET:
1916                 card->lan_type_trans = eth_type_trans;
1917                 dev = alloc_etherdev(0);
1918                 break;
1919 #endif
1920 #ifdef CONFIG_TR
1921         case LCS_FRAME_TYPE_TR:
1922                 card->lan_type_trans = tr_type_trans;
1923                 dev = alloc_trdev(0);
1924                 break;
1925 #endif
1926 #ifdef CONFIG_FDDI
1927         case LCS_FRAME_TYPE_FDDI:
1928                 card->lan_type_trans = fddi_type_trans;
1929                 dev = alloc_fddidev(0);
1930                 break;
1931 #endif
1932         default:
1933                 LCS_DBF_TEXT(3, setup, "errinit");
1934                 PRINT_ERR("LCS: Initialization failed\n");
1935                 PRINT_ERR("LCS: No device found!\n");
1936                 goto out;
1937         }
1938         if (!dev)
1939                 goto out;
1940         card->dev = dev;
1941 netdev_out:
1942         card->dev->priv = card;
1943         card->dev->open = lcs_open_device;
1944         card->dev->stop = lcs_stop_device;
1945         card->dev->hard_start_xmit = lcs_start_xmit;
1946         card->dev->get_stats = lcs_getstats;
1947         SET_MODULE_OWNER(dev);
1948         if (lcs_register_netdev(ccwgdev) != 0)
1949                 goto out;
1950         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
1951 #ifdef CONFIG_IP_MULTICAST
1952         if (!lcs_check_multicast_support(card))
1953                 card->dev->set_multicast_list = lcs_set_multicast_list;
1954 #endif
1955         netif_stop_queue(card->dev);
1956         if (recover_state == DEV_STATE_RECOVER) {
1957                 card->dev->flags |= IFF_UP;
1958                 netif_wake_queue(card->dev);
1959                 card->state = DEV_STATE_UP;
1960         } else
1961                 lcs_stopcard(card);
1962
1963         return 0;
1964 out:
1965
1966         ccw_device_set_offline(card->read.ccwdev);
1967         ccw_device_set_offline(card->write.ccwdev);
1968         return -ENODEV;
1969 }
1970
1971 /**
1972  * lcs_shutdown_device, called when setting the group device offline.
1973  */
1974 static int
1975 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
1976 {
1977         struct lcs_card *card;
1978         enum lcs_dev_states recover_state;
1979         int ret;
1980
1981         LCS_DBF_TEXT(3, setup, "shtdndev");
1982         card = (struct lcs_card *)ccwgdev->dev.driver_data;
1983         if (!card)
1984                 return -ENODEV;
1985
1986         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
1987         recover_state = card->state;
1988
1989         ret = lcs_stop_device(card->dev);
1990         ret = ccw_device_set_offline(card->read.ccwdev);
1991         ret = ccw_device_set_offline(card->write.ccwdev);
1992         if (recover_state == DEV_STATE_UP) {
1993                 card->state = DEV_STATE_RECOVER;
1994         }
1995         if (ret)
1996                 return ret;
1997         return 0;
1998 }
1999
2000 /**
2001  * lcs_remove_device, free buffers and card
2002  */
2003 static void
2004 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2005 {
2006         struct lcs_card *card;
2007
2008         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2009         if (!card)
2010                 return;
2011
2012         PRINT_INFO("Removing lcs group device ....\n");
2013         LCS_DBF_TEXT(3, setup, "remdev");
2014         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2015         if (ccwgdev->state == CCWGROUP_ONLINE) {
2016                 lcs_shutdown_device(ccwgdev);
2017         }
2018         if (card->dev)
2019                 unregister_netdev(card->dev);
2020         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2021         lcs_cleanup_card(card);
2022         lcs_free_card(card);
2023         put_device(&ccwgdev->dev);
2024 }
2025
2026 /**
2027  * LCS ccwgroup driver registration
2028  */
2029 static struct ccwgroup_driver lcs_group_driver = {
2030         .owner       = THIS_MODULE,
2031         .name        = "lcs",
2032         .max_slaves  = 2,
2033         .driver_id   = 0xD3C3E2,
2034         .probe       = lcs_probe_device,
2035         .remove      = lcs_remove_device,
2036         .set_online  = lcs_new_device,
2037         .set_offline = lcs_shutdown_device,
2038 };
2039
2040 /**
2041  *  LCS Module/Kernel initialization function
2042  */
2043 static int
2044 __init lcs_init_module(void)
2045 {
2046         int rc;
2047
2048         PRINT_INFO("Loading %s\n",version);
2049         rc = lcs_register_debug_facility();
2050         LCS_DBF_TEXT(0, setup, "lcsinit");
2051         if (rc) {
2052                 PRINT_ERR("Initialization failed\n");
2053                 return rc;
2054         }
2055
2056         rc = register_cu3088_discipline(&lcs_group_driver);
2057         if (rc) {
2058                 PRINT_ERR("Initialization failed\n");
2059                 return rc;
2060         }
2061
2062         return 0;
2063 }
2064
2065
2066 /**
2067  *  LCS module cleanup function
2068  */
2069 static void
2070 __exit lcs_cleanup_module(void)
2071 {
2072         PRINT_INFO("Terminating lcs module.\n");
2073         LCS_DBF_TEXT(0, trace, "cleanup");
2074         unregister_cu3088_discipline(&lcs_group_driver);
2075         lcs_unregister_debug_facility();
2076 }
2077
2078 module_init(lcs_init_module);
2079 module_exit(lcs_cleanup_module);
2080
2081 MODULE_AUTHOR("Frank Pavlic <pavlic@de.ibm.com>");
2082 MODULE_LICENSE("GPL");
2083