Free Electrons

Embedded Linux Experts

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
/* Copyright (C) 2007-2008  One Stop Systems
 * Copyright (C) 2003-2006  SBE, Inc.
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/hdlc.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include "pmcc4_sysdep.h"
#include "sbecom_inline_linux.h"
#include "libsbew.h"
#include "pmcc4.h"
#include "pmcc4_ioctls.h"
#include "pmcc4_private.h"
#include "sbeproc.h"

/*****************************************************************************************
 * Error out early if we have compiler trouble.
 *
 *   (This section is included from the kernel's init/main.c as a friendly
 *   spiderman recommendation...)
 *
 * Versions of gcc older than that listed below may actually compile and link
 * okay, but the end product can have subtle run time bugs.  To avoid associated
 * bogus bug reports, we flatly refuse to compile with a gcc that is known to be
 * too old from the very beginning.
 */
#if (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 2)
#error Sorry, your GCC is too old. It builds incorrect kernels.
#endif

#if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0
#warning gcc-4.1.0 is known to miscompile the kernel.  A different compiler version is recommended.
#endif

/*****************************************************************************************/

#ifdef SBE_INCLUDE_SYMBOLS
#define STATIC
#else
#define STATIC  static
#endif

#define CHANNAME "hdlc"

/*******************************************************************/
/* forward references */
status_t    c4_chan_work_init (mpi_t *, mch_t *);
void        musycc_wq_chan_restart (void *);
status_t __init c4_init (ci_t *, u_char *, u_char *);
status_t __init c4_init2 (ci_t *);
ci_t       *__init c4_new (void *);
int __init  c4hw_attach_all (void);
void __init hdw_sn_get (hdw_info_t *, int);

#ifdef CONFIG_SBE_PMCC4_NCOMM
irqreturn_t c4_ebus_intr_th_handler (void *);

#endif
int         c4_frame_rw (ci_t *, struct sbecom_port_param *);
status_t    c4_get_port (ci_t *, int);
int         c4_loop_port (ci_t *, int, u_int8_t);
int         c4_musycc_rw (ci_t *, struct c4_musycc_param *);
int         c4_new_chan (ci_t *, int, int, void *);
status_t    c4_set_port (ci_t *, int);
int         c4_pld_rw (ci_t *, struct sbecom_port_param *);
void        cleanup_devs (void);
void        cleanup_ioremap (void);
status_t    musycc_chan_down (ci_t *, int);
irqreturn_t musycc_intr_th_handler (void *);
int         musycc_start_xmit (ci_t *, int, void *);

extern char pmcc4_OSSI_release[];
extern ci_t *CI;
extern struct s_hdw_info hdw_info[];

#if defined(CONFIG_SBE_HDLC_V7) || defined(CONFIG_SBE_WAN256T3_HDLC_V7) || \
    defined(CONFIG_SBE_HDLC_V7_MODULE) || defined(CONFIG_SBE_WAN256T3_HDLC_V7_MODULE)
#define _v7_hdlc_  1
#else
#define _v7_hdlc_  0
#endif

#if _v7_hdlc_
#define V7(x) (x ## _v7)
extern int  hdlc_netif_rx_v7 (hdlc_device *, struct sk_buff *);
extern int  register_hdlc_device_v7 (hdlc_device *);
extern int  unregister_hdlc_device_v7 (hdlc_device *);

#else
#define V7(x) x
#endif

int         error_flag;         /* module load error reporting */
int         cxt1e1_log_level = LOG_ERROR;
int         log_level_default = LOG_ERROR;
module_param(cxt1e1_log_level, int, 0444);

int         cxt1e1_max_mru = MUSYCC_MRU;
int         max_mru_default = MUSYCC_MRU;
module_param(cxt1e1_max_mru, int, 0444);

int         cxt1e1_max_mtu = MUSYCC_MTU;
int         max_mtu_default = MUSYCC_MTU;
module_param(cxt1e1_max_mtu, int, 0444);

int         max_txdesc_used = MUSYCC_TXDESC_MIN;
int         max_txdesc_default = MUSYCC_TXDESC_MIN;
module_param(max_txdesc_used, int, 0444);

int         max_rxdesc_used = MUSYCC_RXDESC_MIN;
int         max_rxdesc_default = MUSYCC_RXDESC_MIN;
module_param(max_rxdesc_used, int, 0444);

/****************************************************************************/
/****************************************************************************/
/****************************************************************************/

void       *
getuserbychan (int channum)
{
    mch_t      *ch;

    ch = c4_find_chan (channum);
    return ch ? ch->user : 0;
}


char       *
get_hdlc_name (hdlc_device * hdlc)
{
    struct c4_priv *priv = hdlc->priv;
    struct net_device *dev = getuserbychan (priv->channum);

    return dev->name;
}


static      status_t
mkret (int bsd)
{
    if (bsd > 0)
        return -bsd;
    else
        return bsd;
}

/***************************************************************************/
#include <linux/workqueue.h>

/***
 * One workqueue (wq) per port (since musycc allows simultaneous group
 * commands), with individual data for each channel:
 *
 *   mpi_t -> struct workqueue_struct *wq_port;  (dynamically allocated using
 *                                               create_workqueue())
 *
 * With work structure (work) statically allocated for each channel:
 *
 *   mch_t -> struct work_struct ch_work;  (statically allocated using ???)
 *
 ***/


/*
 * Called by the start transmit routine when a channel TX_ENABLE is to be
 * issued.  This queues the transmission start request among other channels
 * within a port's group.
 */
void
c4_wk_chan_restart (mch_t * ch)
{
    mpi_t      *pi = ch->up;

#ifdef RLD_RESTART_DEBUG
    pr_info(">> %s: queueing Port %d Chan %d, mch_t @ %p\n",
            __func__, pi->portnum, ch->channum, ch);
#endif

    /* create new entry w/in workqueue for this channel and let'er rip */

    /** queue_work (struct workqueue_struct *queue,
     **             struct work_struct *work);
     **/
    queue_work (pi->wq_port, &ch->ch_work);
}

status_t
c4_wk_chan_init (mpi_t * pi, mch_t * ch)
{
    /*
     * this will be used to restart a stopped channel
     */

    /** INIT_WORK (struct work_struct *work,
     **            void (*function)(void *),
     **            void *data);
     **/
    INIT_WORK(&ch->ch_work, (void *)musycc_wq_chan_restart);
    return 0;                       /* success */
}

status_t
c4_wq_port_init (mpi_t * pi)
{

    char        name[16], *np;  /* NOTE: name of the queue limited by system
                                 * to 10 characters */

    if (pi->wq_port)
        return 0;                   /* already initialized */

    np = name;
    memset (name, 0, 16);
    sprintf (np, "%s%d", pi->up->devname, pi->portnum); /* IE pmcc4-01) */

#ifdef RLD_RESTART_DEBUG
    pr_info(">> %s: creating workqueue <%s> for Port %d.\n",
            __func__, name, pi->portnum); /* RLD DEBUG */
#endif
    if (!(pi->wq_port = create_singlethread_workqueue (name)))
        return ENOMEM;
    return 0;                       /* success */
}

void
c4_wq_port_cleanup (mpi_t * pi)
{
    /*
     * PORT POINT: cannot call this if WQ is statically allocated w/in
     * structure since it calls kfree(wq);
     */
    if (pi->wq_port)
    {
        destroy_workqueue (pi->wq_port);        /* this also calls
                                                 * flush_workqueue() */
        pi->wq_port = 0;
    }
}

/***************************************************************************/

irqreturn_t
c4_linux_interrupt (int irq, void *dev_instance)
{
    struct net_device *ndev = dev_instance;

    return musycc_intr_th_handler(netdev_priv(ndev));
}


#ifdef CONFIG_SBE_PMCC4_NCOMM
irqreturn_t
c4_ebus_interrupt (int irq, void *dev_instance)
{
    struct net_device *ndev = dev_instance;

    return c4_ebus_intr_th_handler(netdev_priv(ndev));
}
#endif


static int
void_open (struct net_device * ndev)
{
    pr_info("%s: trying to open master device !\n", ndev->name);
    return -1;
}


STATIC int
chan_open (struct net_device * ndev)
{
    hdlc_device *hdlc = dev_to_hdlc (ndev);
    const struct c4_priv *priv = hdlc->priv;
    int         ret;

    if ((ret = hdlc_open (ndev)))
    {
        pr_info("hdlc_open failure, err %d.\n", ret);
        return ret;
    }
    if ((ret = c4_chan_up (priv->ci, priv->channum)))
        return -ret;
    try_module_get (THIS_MODULE);
    netif_start_queue (ndev);
    return 0;                       /* no error = success */
}


STATIC int
chan_close (struct net_device * ndev)
{
    hdlc_device *hdlc = dev_to_hdlc (ndev);
    const struct c4_priv *priv = hdlc->priv;

    netif_stop_queue (ndev);
    musycc_chan_down ((ci_t *) 0, priv->channum);
    hdlc_close (ndev);
    module_put (THIS_MODULE);
    return 0;
}


STATIC int
chan_dev_ioctl (struct net_device * dev, struct ifreq * ifr, int cmd)
{
    return hdlc_ioctl (dev, ifr, cmd);
}


STATIC int
chan_attach_noop (struct net_device * ndev, unsigned short foo_1, unsigned short foo_2)
{
    return 0;                   /* our driver has nothing to do here, show's
                                 * over, go home */
}


STATIC struct net_device_stats *
chan_get_stats (struct net_device * ndev)
{
    mch_t      *ch;
    struct net_device_stats *nstats;
    struct sbecom_chan_stats *stats;
    int         channum;

    {
        struct c4_priv *priv;

        priv = (struct c4_priv *) dev_to_hdlc (ndev)->priv;
        channum = priv->channum;
    }

    ch = c4_find_chan (channum);
    if (ch == NULL)
        return NULL;

    nstats = &ndev->stats;
    stats = &ch->s;

    memset (nstats, 0, sizeof (struct net_device_stats));
    nstats->rx_packets = stats->rx_packets;
    nstats->tx_packets = stats->tx_packets;
    nstats->rx_bytes = stats->rx_bytes;
    nstats->tx_bytes = stats->tx_bytes;
    nstats->rx_errors = stats->rx_length_errors +
        stats->rx_over_errors +
        stats->rx_crc_errors +
        stats->rx_frame_errors +
        stats->rx_fifo_errors +
        stats->rx_missed_errors;
    nstats->tx_errors = stats->tx_dropped +
        stats->tx_aborted_errors +
        stats->tx_fifo_errors;
    nstats->rx_dropped = stats->rx_dropped;
    nstats->tx_dropped = stats->tx_dropped;

    nstats->rx_length_errors = stats->rx_length_errors;
    nstats->rx_over_errors = stats->rx_over_errors;
    nstats->rx_crc_errors = stats->rx_crc_errors;
    nstats->rx_frame_errors = stats->rx_frame_errors;
    nstats->rx_fifo_errors = stats->rx_fifo_errors;
    nstats->rx_missed_errors = stats->rx_missed_errors;

    nstats->tx_aborted_errors = stats->tx_aborted_errors;
    nstats->tx_fifo_errors = stats->tx_fifo_errors;

    return nstats;
}


static ci_t *
get_ci_by_dev (struct net_device * ndev)
{
    return (ci_t *)(netdev_priv(ndev));
}


STATIC int
c4_linux_xmit (struct sk_buff * skb, struct net_device * ndev)
{
    const struct c4_priv *priv;
    int         rval;

    hdlc_device *hdlc = dev_to_hdlc (ndev);

    priv = hdlc->priv;

    rval = musycc_start_xmit (priv->ci, priv->channum, skb);
    return -rval;
}

static const struct net_device_ops chan_ops = {
       .ndo_open       = chan_open,
       .ndo_stop       = chan_close,
       .ndo_start_xmit = c4_linux_xmit,
       .ndo_do_ioctl   = chan_dev_ioctl,
       .ndo_get_stats  = chan_get_stats,
};

STATIC struct net_device *
create_chan (struct net_device * ndev, ci_t * ci,
             struct sbecom_chan_param * cp)
{
    hdlc_device *hdlc;
    struct net_device *dev;
    hdw_info_t *hi;
    int         ret;

    if (c4_find_chan (cp->channum))
        return 0;                   /* channel already exists */

    {
        struct c4_priv *priv;

        /* allocate then fill in private data structure */
        priv = OS_kmalloc (sizeof (struct c4_priv));
        if (!priv)
        {
            pr_warning("%s: no memory for net_device !\n", ci->devname);
            return 0;
        }
        dev = alloc_hdlcdev (priv);
        if (!dev)
        {
            pr_warning("%s: no memory for hdlc_device !\n", ci->devname);
            OS_kfree (priv);
            return 0;
        }
        priv->ci = ci;
        priv->channum = cp->channum;
    }

    hdlc = dev_to_hdlc (dev);

    dev->base_addr = 0;             /* not I/O mapped */
    dev->irq = ndev->irq;
    dev->type = ARPHRD_RAWHDLC;
    *dev->name = 0;                 /* default ifconfig name = "hdlc" */

    hi = (hdw_info_t *) ci->hdw_info;
    if (hi->mfg_info_sts == EEPROM_OK)
    {
        switch (hi->promfmt)
        {
        case PROM_FORMAT_TYPE1:
            memcpy (dev->dev_addr, (FLD_TYPE1 *) (hi->mfg_info.pft1.Serial), 6);
            break;
        case PROM_FORMAT_TYPE2:
            memcpy (dev->dev_addr, (FLD_TYPE2 *) (hi->mfg_info.pft2.Serial), 6);
            break;
        default:
            memset (dev->dev_addr, 0, 6);
            break;
        }
    } else
    {
        memset (dev->dev_addr, 0, 6);
    }

    hdlc->xmit = c4_linux_xmit;

    dev->netdev_ops = &chan_ops;
    /*
     * The native hdlc stack calls this 'attach' routine during
     * hdlc_raw_ioctl(), passing parameters for line encoding and parity.
     * Since hdlc_raw_ioctl() stack does not interrogate whether an 'attach'
     * routine is actually registered or not, we supply a dummy routine which
     * does nothing (since encoding and parity are setup for our driver via a
     * special configuration application).
     */

    hdlc->attach = chan_attach_noop;

    rtnl_unlock ();                 /* needed due to Ioctl calling sequence */
    ret = register_hdlc_device (dev);
    /* NOTE: <stats> setting must occur AFTER registration in order to "take" */
    dev->tx_queue_len = MAX_DEFAULT_IFQLEN;

    rtnl_lock ();                   /* needed due to Ioctl calling sequence */
    if (ret)
    {
        if (cxt1e1_log_level >= LOG_WARN)
            pr_info("%s: create_chan[%d] registration error = %d.\n",
                    ci->devname, cp->channum, ret);
        free_netdev (dev);          /* cleanup */
        return 0;                   /* failed to register */
    }
    return dev;
}


/* the idea here is to get port information and pass it back (using pointer) */
STATIC      status_t
do_get_port (struct net_device * ndev, void *data)
{
    int         ret;
    ci_t       *ci;             /* ci stands for card information */
    struct sbecom_port_param pp;/* copy data to kernel land */

    if (copy_from_user (&pp, data, sizeof (struct sbecom_port_param)))
        return -EFAULT;
    if (pp.portnum >= MUSYCC_NPORTS)
        return -EFAULT;
    ci = get_ci_by_dev (ndev);
    if (!ci)
        return -EINVAL;             /* get card info */

    ret = mkret (c4_get_port (ci, pp.portnum));
    if (ret)
        return ret;
    if (copy_to_user (data, &ci->port[pp.portnum].p,
                      sizeof (struct sbecom_port_param)))
        return -EFAULT;
    return 0;
}

/* this function copys the user data and then calls the real action function */
STATIC      status_t
do_set_port (struct net_device * ndev, void *data)
{
    ci_t       *ci;             /* ci stands for card information */
    struct sbecom_port_param pp;/* copy data to kernel land */

    if (copy_from_user (&pp, data, sizeof (struct sbecom_port_param)))
        return -EFAULT;
    if (pp.portnum >= MUSYCC_NPORTS)
        return -EFAULT;
    ci = get_ci_by_dev (ndev);
    if (!ci)
        return -EINVAL;             /* get card info */

    if (pp.portnum >= ci->max_port) /* sanity check */
        return -ENXIO;

    memcpy (&ci->port[pp.portnum].p, &pp, sizeof (struct sbecom_port_param));
    return mkret (c4_set_port (ci, pp.portnum));
}

/* work the port loopback mode as per directed */
STATIC      status_t
do_port_loop (struct net_device * ndev, void *data)
{
    struct sbecom_port_param pp;
    ci_t       *ci;

    if (copy_from_user (&pp, data, sizeof (struct sbecom_port_param)))
        return -EFAULT;
    ci = get_ci_by_dev (ndev);
    if (!ci)
        return -EINVAL;
    return mkret (c4_loop_port (ci, pp.portnum, pp.port_mode));
}

/* set the specified register with the given value / or just read it */
STATIC      status_t
do_framer_rw (struct net_device * ndev, void *data)
{
    struct sbecom_port_param pp;
    ci_t       *ci;
    int         ret;

    if (copy_from_user (&pp, data, sizeof (struct sbecom_port_param)))
        return -EFAULT;
    ci = get_ci_by_dev (ndev);
    if (!ci)
        return -EINVAL;
    ret = mkret (c4_frame_rw (ci, &pp));
    if (ret)
        return ret;
    if (copy_to_user (data, &pp, sizeof (struct sbecom_port_param)))
        return -EFAULT;
    return 0;
}

/* set the specified register with the given value / or just read it */
STATIC      status_t
do_pld_rw (struct net_device * ndev, void *data)
{
    struct sbecom_port_param pp;
    ci_t       *ci;
    int         ret;

    if (copy_from_user (&pp, data, sizeof (struct sbecom_port_param)))
        return -EFAULT;
    ci = get_ci_by_dev (ndev);
    if (!ci)
        return -EINVAL;
    ret = mkret (c4_pld_rw (ci, &pp));
    if (ret)
        return ret;
    if (copy_to_user (data, &pp, sizeof (struct sbecom_port_param)))
        return -EFAULT;
    return 0;
}

/* set the specified register with the given value / or just read it */
STATIC      status_t
do_musycc_rw (struct net_device * ndev, void *data)
{
    struct c4_musycc_param mp;
    ci_t       *ci;
    int         ret;

    if (copy_from_user (&mp, data, sizeof (struct c4_musycc_param)))
        return -EFAULT;
    ci = get_ci_by_dev (ndev);
    if (!ci)
        return -EINVAL;
    ret = mkret (c4_musycc_rw (ci, &mp));
    if (ret)
        return ret;
    if (copy_to_user (data, &mp, sizeof (struct c4_musycc_param)))
        return -EFAULT;
    return 0;
}

STATIC      status_t
do_get_chan (struct net_device * ndev, void *data)
{
    struct sbecom_chan_param cp;
    int         ret;

    if (copy_from_user (&cp, data,
                        sizeof (struct sbecom_chan_param)))
        return -EFAULT;

    if ((ret = mkret (c4_get_chan (cp.channum, &cp))))
        return ret;

    if (copy_to_user (data, &cp, sizeof (struct sbecom_chan_param)))
        return -EFAULT;
    return 0;
}

STATIC      status_t
do_set_chan (struct net_device * ndev, void *data)
{
    struct sbecom_chan_param cp;
    int         ret;
    ci_t       *ci;

    if (copy_from_user (&cp, data, sizeof (struct sbecom_chan_param)))
        return -EFAULT;
    ci = get_ci_by_dev (ndev);
    if (!ci)
        return -EINVAL;
    switch (ret = mkret (c4_set_chan (cp.channum, &cp)))
    {
    case 0:
        return 0;
    default:
        return ret;
    }
}

STATIC      status_t
do_create_chan (struct net_device * ndev, void *data)
{
    ci_t       *ci;
    struct net_device *dev;
    struct sbecom_chan_param cp;
    int         ret;

    if (copy_from_user (&cp, data, sizeof (struct sbecom_chan_param)))
        return -EFAULT;
    ci = get_ci_by_dev (ndev);
    if (!ci)
        return -EINVAL;
    dev = create_chan (ndev, ci, &cp);
    if (!dev)
        return -EBUSY;
    ret = mkret (c4_new_chan (ci, cp.port, cp.channum, dev));
    if (ret)
    {
        rtnl_unlock ();             /* needed due to Ioctl calling sequence */
        unregister_hdlc_device (dev);
        rtnl_lock ();               /* needed due to Ioctl calling sequence */
        free_netdev (dev);
    }
    return ret;
}

STATIC      status_t
do_get_chan_stats (struct net_device * ndev, void *data)
{
    struct c4_chan_stats_wrap ccs;
    int         ret;

    if (copy_from_user (&ccs, data,
                        sizeof (struct c4_chan_stats_wrap)))
        return -EFAULT;
    switch (ret = mkret (c4_get_chan_stats (ccs.channum, &ccs.stats)))
    {
    case 0:
        break;
    default:
        return ret;
    }
    if (copy_to_user (data, &ccs,
                      sizeof (struct c4_chan_stats_wrap)))
        return -EFAULT;
    return 0;
}
STATIC      status_t
do_set_loglevel (struct net_device * ndev, void *data)
{
    unsigned int cxt1e1_log_level;

    if (copy_from_user (&cxt1e1_log_level, data, sizeof (int)))
        return -EFAULT;
    sbecom_set_loglevel (cxt1e1_log_level);
    return 0;
}

STATIC      status_t
do_deluser (struct net_device * ndev, int lockit)
{
    if (ndev->flags & IFF_UP)
        return -EBUSY;

    {
        ci_t       *ci;
        mch_t      *ch;
        const struct c4_priv *priv;
        int         channum;

        priv = (struct c4_priv *) dev_to_hdlc (ndev)->priv;
        ci = priv->ci;
        channum = priv->channum;

        ch = c4_find_chan (channum);
        if (ch == NULL)
            return -ENOENT;
        ch->user = 0;               /* will be freed, below */
    }

    if (lockit)
        rtnl_unlock ();             /* needed if Ioctl calling sequence */
    unregister_hdlc_device (ndev);
    if (lockit)
        rtnl_lock ();               /* needed if Ioctl calling sequence */
    free_netdev (ndev);
    return 0;
}

int
do_del_chan (struct net_device * musycc_dev, void *data)
{
    struct sbecom_chan_param cp;
    char        buf[sizeof (CHANNAME) + 3];
    struct net_device *dev;
    int         ret;

    if (copy_from_user (&cp, data,
                        sizeof (struct sbecom_chan_param)))
        return -EFAULT;
    sprintf (buf, CHANNAME "%d", cp.channum);
    if (!(dev = dev_get_by_name (&init_net, buf)))
        return -ENOENT;
    dev_put (dev);
    ret = do_deluser (dev, 1);
    if (ret)
        return ret;
    return c4_del_chan (cp.channum);
}
int         c4_reset_board (void *);

int
do_reset (struct net_device * musycc_dev, void *data)
{
    const struct c4_priv *priv;
    int         i;

    for (i = 0; i < 128; i++)
    {
        struct net_device *ndev;
        char        buf[sizeof (CHANNAME) + 3];

        sprintf (buf, CHANNAME "%d", i);
        if (!(ndev = dev_get_by_name(&init_net, buf)))
            continue;
        priv = dev_to_hdlc (ndev)->priv;

        if ((unsigned long) (priv->ci) ==
            (unsigned long) (netdev_priv(musycc_dev)))
        {
            ndev->flags &= ~IFF_UP;
            dev_put (ndev);
            netif_stop_queue (ndev);
            do_deluser (ndev, 1);
        } else
            dev_put (ndev);
    }
    return 0;
}

int
do_reset_chan_stats (struct net_device * musycc_dev, void *data)
{
    struct sbecom_chan_param cp;

    if (copy_from_user (&cp, data,
                        sizeof (struct sbecom_chan_param)))
        return -EFAULT;
    return mkret (c4_del_chan_stats (cp.channum));
}

STATIC      status_t
c4_ioctl (struct net_device * ndev, struct ifreq * ifr, int cmd)
{
    ci_t       *ci;
    void       *data;
    int         iocmd, iolen;
    status_t    ret;
    static struct data
    {
        union
        {
            u_int8_t c;
            u_int32_t i;
            struct sbe_brd_info bip;
            struct sbe_drv_info dip;
            struct sbe_iid_info iip;
            struct sbe_brd_addr bap;
            struct sbecom_chan_stats stats;
            struct sbecom_chan_param param;
            struct temux_card_stats cards;
            struct sbecom_card_param cardp;
            struct sbecom_framer_param frp;
        }           u;
    }           arg;


    if (!capable (CAP_SYS_ADMIN))
        return -EPERM;
    if (cmd != SIOCDEVPRIVATE + 15)
        return -EINVAL;
    if (!(ci = get_ci_by_dev (ndev)))
        return -EINVAL;
    if (ci->state != C_RUNNING)
        return -ENODEV;
    if (copy_from_user (&iocmd, ifr->ifr_data, sizeof (iocmd)))
        return -EFAULT;
#if 0
    if (copy_from_user (&len, ifr->ifr_data + sizeof (iocmd), sizeof (len)))
        return -EFAULT;
#endif

#if 0
    pr_info("c4_ioctl: iocmd %x, dir %x type %x nr %x iolen %d.\n", iocmd,
            _IOC_DIR (iocmd), _IOC_TYPE (iocmd), _IOC_NR (iocmd),
            _IOC_SIZE (iocmd));
#endif
    iolen = _IOC_SIZE (iocmd);
    data = ifr->ifr_data + sizeof (iocmd);
    if (copy_from_user (&arg, data, iolen))
        return -EFAULT;

    ret = 0;
    switch (iocmd)
    {
    case SBE_IOC_PORT_GET:
        //pr_info(">> SBE_IOC_PORT_GET Ioctl...\n");
        ret = do_get_port (ndev, data);
        break;
    case SBE_IOC_PORT_SET:
        //pr_info(">> SBE_IOC_PORT_SET Ioctl...\n");
        ret = do_set_port (ndev, data);
        break;
    case SBE_IOC_CHAN_GET:
        //pr_info(">> SBE_IOC_CHAN_GET Ioctl...\n");
        ret = do_get_chan (ndev, data);
        break;
    case SBE_IOC_CHAN_SET:
        //pr_info(">> SBE_IOC_CHAN_SET Ioctl...\n");
        ret = do_set_chan (ndev, data);
        break;
    case C4_DEL_CHAN:
        //pr_info(">> C4_DEL_CHAN Ioctl...\n");
        ret = do_del_chan (ndev, data);
        break;
    case SBE_IOC_CHAN_NEW:
        ret = do_create_chan (ndev, data);
        break;
    case SBE_IOC_CHAN_GET_STAT:
        ret = do_get_chan_stats (ndev, data);
        break;
    case SBE_IOC_LOGLEVEL:
        ret = do_set_loglevel (ndev, data);
        break;
    case SBE_IOC_RESET_DEV:
        ret = do_reset (ndev, data);
        break;
    case SBE_IOC_CHAN_DEL_STAT:
        ret = do_reset_chan_stats (ndev, data);
        break;
    case C4_LOOP_PORT:
        ret = do_port_loop (ndev, data);
        break;
    case C4_RW_FRMR:
        ret = do_framer_rw (ndev, data);
        break;
    case C4_RW_MSYC:
        ret = do_musycc_rw (ndev, data);
        break;
    case C4_RW_PLD:
        ret = do_pld_rw (ndev, data);
        break;
    case SBE_IOC_IID_GET:
        ret = (iolen == sizeof (struct sbe_iid_info)) ? c4_get_iidinfo (ci, &arg.u.iip) : -EFAULT;
        if (ret == 0)               /* no error, copy data */
            if (copy_to_user (data, &arg, iolen))
                return -EFAULT;
        break;
    default:
        //pr_info(">> c4_ioctl: EINVAL - unknown iocmd <%x>\n", iocmd);
        ret = -EINVAL;
        break;
    }
    return mkret (ret);
}

static const struct net_device_ops c4_ops = {
       .ndo_open       = void_open,
       .ndo_start_xmit = c4_linux_xmit,
       .ndo_do_ioctl   = c4_ioctl,
};

static void c4_setup(struct net_device *dev)
{
       dev->type = ARPHRD_VOID;
       dev->netdev_ops = &c4_ops;
}

struct net_device *__init
c4_add_dev (hdw_info_t * hi, int brdno, unsigned long f0, unsigned long f1,
            int irq0, int irq1)
{
    struct net_device *ndev;
    ci_t       *ci;

    ndev = alloc_netdev(sizeof(ci_t), SBE_IFACETMPL, c4_setup);
    if (!ndev)
    {
        pr_warning("%s: no memory for struct net_device !\n", hi->devname);
        error_flag = ENOMEM;
        return 0;
    }
    ci = (ci_t *)(netdev_priv(ndev));
    ndev->irq = irq0;

    ci->hdw_info = hi;
    ci->state = C_INIT;         /* mark as hardware not available */
    ci->next = c4_list;
    c4_list = ci;
    ci->brdno = ci->next ? ci->next->brdno + 1 : 0;

    if (CI == 0)
        CI = ci;                    /* DEBUG, only board 0 usage */

    strcpy (ci->devname, hi->devname);
    ci->release = &pmcc4_OSSI_release[0];

    /* tasklet */
#if defined(SBE_ISR_TASKLET)
    tasklet_init (&ci->ci_musycc_isr_tasklet,
                  (void (*) (unsigned long)) musycc_intr_bh_tasklet,
                  (unsigned long) ci);

    if (atomic_read (&ci->ci_musycc_isr_tasklet.count) == 0)
        tasklet_disable_nosync (&ci->ci_musycc_isr_tasklet);
#elif defined(SBE_ISR_IMMEDIATE)
    ci->ci_musycc_isr_tq.routine = (void *) (unsigned long) musycc_intr_bh_tasklet;
    ci->ci_musycc_isr_tq.data = ci;
#endif


    if (register_netdev (ndev) ||
        (c4_init (ci, (u_char *) f0, (u_char *) f1) != SBE_DRVR_SUCCESS))
    {
        OS_kfree (netdev_priv(ndev));
        OS_kfree (ndev);
        error_flag = ENODEV;
        return 0;
    }
    /*************************************************************
     *  int request_irq(unsigned int irq,
     *                  void (*handler)(int, void *, struct pt_regs *),
     *                  unsigned long flags, const char *dev_name, void *dev_id);
     *  wherein:
     *  irq      -> The interrupt number that is being requested.
     *  handler  -> Pointer to handling function being installed.
     *  flags    -> A bit mask of options related to interrupt management.
     *  dev_name -> String used in /proc/interrupts to show owner of interrupt.
     *  dev_id   -> Pointer (for shared interrupt lines) to point to its own
     *              private data area (to identify which device is interrupting).
     *
     *  extern void free_irq(unsigned int irq, void *dev_id);
     **************************************************************/

    if (request_irq (irq0, &c4_linux_interrupt,
                     IRQF_SHARED,
                     ndev->name, ndev))
    {
        pr_warning("%s: MUSYCC could not get irq: %d\n", ndev->name, irq0);
        unregister_netdev (ndev);
        OS_kfree (netdev_priv(ndev));
        OS_kfree (ndev);
        error_flag = EIO;
        return 0;
    }
#ifdef CONFIG_SBE_PMCC4_NCOMM
    if (request_irq (irq1, &c4_ebus_interrupt, IRQF_SHARED, ndev->name, ndev))
    {
        pr_warning("%s: EBUS could not get irq: %d\n", hi->devname, irq1);
        unregister_netdev (ndev);
        free_irq (irq0, ndev);
        OS_kfree (netdev_priv(ndev));
        OS_kfree (ndev);
        error_flag = EIO;
        return 0;
    }
#endif

    /* setup board identification information */

    {
        u_int32_t   tmp;

        hdw_sn_get (hi, brdno);     /* also sets PROM format type (promfmt)
                                     * for later usage */

        switch (hi->promfmt)
        {
        case PROM_FORMAT_TYPE1:
            memcpy (ndev->dev_addr, (FLD_TYPE1 *) (hi->mfg_info.pft1.Serial), 6);
            memcpy (&tmp, (FLD_TYPE1 *) (hi->mfg_info.pft1.Id), 4);     /* unaligned data
                                                                         * acquisition */
            ci->brd_id = cpu_to_be32 (tmp);
            break;
        case PROM_FORMAT_TYPE2:
            memcpy (ndev->dev_addr, (FLD_TYPE2 *) (hi->mfg_info.pft2.Serial), 6);
            memcpy (&tmp, (FLD_TYPE2 *) (hi->mfg_info.pft2.Id), 4);     /* unaligned data
                                                                         * acquisition */
            ci->brd_id = cpu_to_be32 (tmp);
            break;
        default:
            ci->brd_id = 0;
            memset (ndev->dev_addr, 0, 6);
            break;
        }

#if 1
        sbeid_set_hdwbid (ci);      /* requires bid to be preset */
#else
        sbeid_set_bdtype (ci);      /* requires hdw_bid to be preset */
#endif

    }

#ifdef CONFIG_PROC_FS
    sbecom_proc_brd_init (ci);
#endif
#if defined(SBE_ISR_TASKLET)
    tasklet_enable (&ci->ci_musycc_isr_tasklet);
#endif


    if ((error_flag = c4_init2 (ci)) != SBE_DRVR_SUCCESS)
    {
#ifdef CONFIG_PROC_FS
        sbecom_proc_brd_cleanup (ci);
#endif
        unregister_netdev (ndev);
        free_irq (irq1, ndev);
        free_irq (irq0, ndev);
        OS_kfree (netdev_priv(ndev));
        OS_kfree (ndev);
        return 0;                   /* failure, error_flag is set */
    }
    return ndev;
}

STATIC int  __init
c4_mod_init (void)
{
    int         rtn;

    pr_warning("%s\n", pmcc4_OSSI_release);
    if ((rtn = c4hw_attach_all ()))
        return -rtn;                /* installation failure - see system log */

    /* housekeeping notifications */
    if (cxt1e1_log_level != log_level_default)
        pr_info("NOTE: driver parameter <cxt1e1_log_level> changed from default %d to %d.\n",
                log_level_default, cxt1e1_log_level);
       if (cxt1e1_max_mru != max_mru_default)
               pr_info("NOTE: driver parameter <cxt1e1_max_mru> changed from default %d to %d.\n",
                               max_mru_default, cxt1e1_max_mru);
       if (cxt1e1_max_mtu != max_mtu_default)
               pr_info("NOTE: driver parameter <cxt1e1_max_mtu> changed from default %d to %d.\n",
                               max_mtu_default, cxt1e1_max_mtu);
    if (max_rxdesc_used != max_rxdesc_default)
    {
        if (max_rxdesc_used > 2000)
            max_rxdesc_used = 2000; /* out-of-bounds reset */
        pr_info("NOTE: driver parameter <max_rxdesc_used> changed from default %d to %d.\n",
                max_rxdesc_default, max_rxdesc_used);
    }
    if (max_txdesc_used != max_txdesc_default)
    {
        if (max_txdesc_used > 1000)
            max_txdesc_used = 1000; /* out-of-bounds reset */
        pr_info("NOTE: driver parameter <max_txdesc_used> changed from default %d to %d.\n",
                max_txdesc_default, max_txdesc_used);
    }
    return 0;                       /* installation success */
}


 /*
  * find any still allocated hdlc registrations and unregister via call to
  * do_deluser()
  */

STATIC void __exit
cleanup_hdlc (void)
{
    hdw_info_t *hi;
    ci_t       *ci;
    struct net_device *ndev;
    int         i, j, k;

    for (i = 0, hi = hdw_info; i < MAX_BOARDS; i++, hi++)
    {
        if (hi->ndev)               /* a board has been attached */
        {
            ci = (ci_t *)(netdev_priv(hi->ndev));
            for (j = 0; j < ci->max_port; j++)
                for (k = 0; k < MUSYCC_NCHANS; k++)
                    if ((ndev = ci->port[j].chan[k]->user))
                    {
                        do_deluser (ndev, 0);
                    }
        }
    }
}


STATIC void __exit
c4_mod_remove (void)
{
    cleanup_hdlc ();            /* delete any missed channels */
    cleanup_devs ();
    c4_cleanup ();
    cleanup_ioremap ();
    pr_info("SBE - driver removed.\n");
}

module_init (c4_mod_init);
module_exit (c4_mod_remove);

MODULE_AUTHOR ("SBE Technical Services <support@sbei.com>");
MODULE_DESCRIPTION ("wanPCI-CxT1E1 Generic HDLC WAN Driver module");
#ifdef MODULE_LICENSE
MODULE_LICENSE ("GPL");
#endif

/***  End-of-File  ***/