drivers/net/wan/sdla_chdlc.c

   1 /*****************************************************************************
   2 * sdla_chdlc.c  WANPIPE(tm) Multiprotocol WAN Link Driver. Cisco HDLC module.
   3 *
   4 * Authors:      Nenad Corbic <ncorbic@sangoma.com>
   5 *               Gideon Hack
   6 *
   7 * Copyright:    (c) 1995-2001 Sangoma Technologies Inc.
   8 *
   9 *               This program is free software; you can redistribute it and/or
  10 *               modify it under the terms of the GNU General Public License
  11 *               as published by the Free Software Foundation; either version
  12 *               2 of the License, or (at your option) any later version.
  13 * ============================================================================
  14 * Feb 28, 2001  Nenad Corbic    Updated if_tx_timeout() routine for
  15 *                               2.4.X kernels.
  16 * Jan 25, 2001  Nenad Corbic    Added a TTY Sync serial driver over the
  17 *                               HDLC streaming protocol
  18 *                               Added a TTY Async serial driver over the
  19 *                               Async protocol.
  20 * Dec 15, 2000  Nenad Corbic    Updated for 2.4.X Kernel support
  21 * Nov 13, 2000  Nenad Corbic    Added true interface type encoding option.
  22 *                               Tcpdump doesn't support CHDLC inteface
  23 *                               types, to fix this "true type" option will set
  24 *                               the interface type to RAW IP mode.
  25 * Nov 07, 2000  Nenad Corbic    Added security features for UDP debugging:
  26 *                               Deny all and specify allowed requests.
  27 * Jun 20, 2000  Nenad Corbic    Fixed the API IP ERROR bug. Caused by the
  28 *                               latest update.
  29 * May 09, 2000  Nenad Corbic    Option to bring down an interface
  30 *                               upon disconnect.
  31 * Mar 23, 2000  Nenad Corbic    Improved task queue, bh handling.
  32 * Mar 16, 2000  Nenad Corbic    Fixed the SLARP Dynamic IP addressing.
  33 * Mar 06, 2000  Nenad Corbic    Bug Fix: corrupted mbox recovery.
  34 * Feb 10, 2000  Gideon Hack     Added ASYNC support.
  35 * Feb 09, 2000  Nenad Corbic    Fixed two shutdown bugs in update() and
  36 *                               if_stats() functions.
  37 * Jan 24, 2000  Nenad Corbic    Fixed a startup wanpipe state racing,
  38 *                               condition between if_open and isr.
  39 * Jan 10, 2000  Nenad Corbic    Added new socket API support.
  40 * Dev 15, 1999  Nenad Corbic    Fixed up header files for 2.0.X kernels
  41 * Nov 20, 1999  Nenad Corbic    Fixed zero length API bug.
  42 * Sep 30, 1999  Nenad Corbic    Fixed dynamic IP and route setup.
  43 * Sep 23, 1999  Nenad Corbic    Added SMP support, fixed tracing
  44 * Sep 13, 1999  Nenad Corbic    Split up Port 0 and 1 into separate devices.
  45 * Jun 02, 1999  Gideon Hack     Added support for the S514 adapter.
  46 * Oct 30, 1998  Jaspreet Singh  Added Support for CHDLC API (HDLC STREAMING).
  47 * Oct 28, 1998  Jaspreet Singh  Added Support for Dual Port CHDLC.
  48 * Aug 07, 1998  David Fong      Initial version.
  49 *****************************************************************************/
  50
  51 #include <linux/module.h>
  52 #include <linux/kernel.h>       /* printk(), and other useful stuff */
  53 #include <linux/stddef.h>       /* offsetof(), etc. */
  54 #include <linux/errno.h>        /* return codes */
  55 #include <linux/string.h>       /* inline memset(), etc. */
  56 #include <linux/slab.h> /* kmalloc(), kfree() */
  57 #include <linux/wanrouter.h>    /* WAN router definitions */
  58 #include <linux/wanpipe.h>      /* WANPIPE common user API definitions */
  59 #include <linux/if_arp.h>       /* ARPHRD_* defines */
  60
  61
  62 #include <asm/uaccess.h>
  63 #include <linux/inetdevice.h>
  64 #include <linux/netdevice.h>
  65
  66 #include <linux/in.h>           /* sockaddr_in */
  67 #include <linux/inet.h>
  68 #include <linux/if.h>
  69 #include <asm/byteorder.h>      /* htons(), etc. */
  70 #include <linux/sdlapci.h>
  71 #include <asm/io.h>
  72
  73 #include <linux/sdla_chdlc.h>           /* CHDLC firmware API definitions */
  74 #include <linux/sdla_asy.h>             /* CHDLC (async) API definitions */
  75
  76 #include <linux/if_wanpipe_common.h>    /* Socket Driver common area */
  77 #include <linux/if_wanpipe.h>
  78
  79 /* TTY Includes */
  80 #include <linux/tty.h>
  81 #include <linux/tty_flip.h>
  82 #include <linux/serial.h>
  83
  84
  85 /****** Defines & Macros ****************************************************/
  86
  87 /* reasons for enabling the timer interrupt on the adapter */
  88 #define TMR_INT_ENABLED_UDP             0x01
  89 #define TMR_INT_ENABLED_UPDATE          0x02
  90 #define TMR_INT_ENABLED_CONFIG          0x10
  91
  92 #define MAX_IP_ERRORS   10
  93
  94 #define TTY_CHDLC_MAX_MTU       2000
  95 #define CHDLC_DFLT_DATA_LEN     1500            /* default MTU */
  96 #define CHDLC_HDR_LEN           1
  97
  98 #define CHDLC_API 0x01
  99
 100 #define PORT(x)   (x == 0 ? "PRIMARY" : "SECONDARY" )
 101 #define MAX_BH_BUFF     10
 102
 103 //#define PRINT_DEBUG
 104 #ifdef PRINT_DEBUG
 105 #define dbg_printk(format, a...) printk(format, ## a)
 106 #else
 107 #define dbg_printk(format, a...)
 108 #endif
 109
 110 /******Data Structures*****************************************************/
 111
 112 /* This structure is placed in the private data area of the device structure.
 113  * The card structure used to occupy the private area but now the following
 114  * structure will incorporate the card structure along with CHDLC specific data
 115  */
 116
 117 typedef struct chdlc_private_area
 118 {
 119         wanpipe_common_t common;
 120         sdla_t          *card;
 121         int             TracingEnabled;         /* For enabling Tracing */
 122         unsigned long   curr_trace_addr;        /* Used for Tracing */
 123         unsigned long   start_trace_addr;
 124         unsigned long   end_trace_addr;
 125         unsigned long   base_addr_trace_buffer;
 126         unsigned long   end_addr_trace_buffer;
 127         unsigned short  number_trace_elements;
 128         unsigned        available_buffer_space;
 129         unsigned long   router_start_time;
 130         unsigned char   route_status;
 131         unsigned char   route_removed;
 132         unsigned long   tick_counter;           /* For 5s timeout counter */
 133         unsigned long   router_up_time;
 134         u32             IP_address;             /* IP addressing */
 135         u32             IP_netmask;
 136         u32             ip_local;
 137         u32             ip_remote;
 138         u32             ip_local_tmp;
 139         u32             ip_remote_tmp;
 140         u8              ip_error;
 141         u8              config_chdlc;
 142         u8              config_chdlc_timeout;
 143         unsigned char  mc;                      /* Mulitcast support on/off */
 144         unsigned short udp_pkt_lgth;            /* udp packet processing */
 145         char udp_pkt_src;
 146         char udp_pkt_data[MAX_LGTH_UDP_MGNT_PKT];
 147         unsigned short timer_int_enabled;
 148         char update_comms_stats;                /* updating comms stats */
 149
 150         bh_data_t *bh_head;               /* Circular buffer for chdlc_bh */
 151         unsigned long  tq_working;
 152         volatile int  bh_write;
 153         volatile int  bh_read;
 154         atomic_t  bh_buff_used;
 155
 156         unsigned char interface_down;
 157
 158         /* Polling work queue entry. Each interface
 159          * has its own work queue entry, which is used
 160          * to defer events from the interrupt */
 161         struct work_struct poll_work;
 162         struct timer_list poll_delay_timer;
 163
 164         u8 gateway;
 165         u8 true_if_encoding;
 166         //FIXME: add driver stats as per frame relay!
 167
 168 } chdlc_private_area_t;
 169
 170 /* Route Status options */
 171 #define NO_ROUTE        0x00
 172 #define ADD_ROUTE       0x01
 173 #define ROUTE_ADDED     0x02
 174 #define REMOVE_ROUTE    0x03
 175
 176
 177 /* variable for keeping track of enabling/disabling FT1 monitor status */
 178 static int rCount = 0;
 179
 180 /* variable for tracking how many interfaces to open for WANPIPE on the
 181    two ports */
 182
 183 extern void disable_irq(unsigned int);
 184 extern void enable_irq(unsigned int);
 185
 186 /****** Function Prototypes *************************************************/
 187 /* WAN link driver entry points. These are called by the WAN router module. */
 188 static int update(struct wan_device* wandev);
 189 static int new_if(struct wan_device* wandev, struct net_device* dev,
 190                   wanif_conf_t* conf);
 191
 192 /* Network device interface */
 193 static int if_init(struct net_device* dev);
 194 static int if_open(struct net_device* dev);
 195 static int if_close(struct net_device* dev);
 196 static int if_header(struct sk_buff* skb, struct net_device* dev,
 197                      unsigned short type, void* daddr, void* saddr,
 198                      unsigned len);
 199
 200 static int if_rebuild_hdr (struct sk_buff *skb);
 201 static struct net_device_stats* if_stats(struct net_device* dev);
 202
 203 static int if_send(struct sk_buff* skb, struct net_device* dev);
 204
 205 /* CHDLC Firmware interface functions */
 206 static int chdlc_configure      (sdla_t* card, void* data);
 207 static int chdlc_comm_enable    (sdla_t* card);
 208 static int chdlc_read_version   (sdla_t* card, char* str);
 209 static int chdlc_set_intr_mode  (sdla_t* card, unsigned mode);
 210 static int chdlc_send (sdla_t* card, void* data, unsigned len);
 211 static int chdlc_read_comm_err_stats (sdla_t* card);
 212 static int chdlc_read_op_stats (sdla_t* card);
 213 static int chdlc_error (sdla_t *card, int err, CHDLC_MAILBOX_STRUCT *mb);
 214
 215
 216 static int chdlc_disable_comm_shutdown (sdla_t *card);
 217 static void if_tx_timeout(struct net_device *dev);
 218
 219 /* Miscellaneous CHDLC Functions */
 220 static int set_chdlc_config (sdla_t* card);
 221 static void init_chdlc_tx_rx_buff( sdla_t* card);
 222 static int process_chdlc_exception(sdla_t *card);
 223 static int process_global_exception(sdla_t *card);
 224 static int update_comms_stats(sdla_t* card,
 225         chdlc_private_area_t* chdlc_priv_area);
 226 static int configure_ip (sdla_t* card);
 227 static int unconfigure_ip (sdla_t* card);
 228 static void process_route(sdla_t *card);
 229 static void port_set_state (sdla_t *card, int);
 230 static int config_chdlc (sdla_t *card);
 231 static void disable_comm (sdla_t *card);
 232
 233 static void trigger_chdlc_poll(struct net_device *dev);
 234 static void chdlc_poll(struct net_device *dev);
 235 static void chdlc_poll_delay (unsigned long dev_ptr);
 236
 237
 238 /* Miscellaneous asynchronous interface Functions */
 239 static int set_asy_config (sdla_t* card);
 240 static int asy_comm_enable (sdla_t* card);
 241
 242 /* Interrupt handlers */
 243 static void wpc_isr (sdla_t* card);
 244 static void rx_intr (sdla_t* card);
 245 static void timer_intr(sdla_t *);
 246
 247 /* Bottom half handlers */
 248 static void chdlc_work(struct net_device *dev);
 249 static int chdlc_work_cleanup(struct net_device *dev);
 250 static int bh_enqueue(struct net_device *dev, struct sk_buff *skb);
 251
 252 /* Miscellaneous functions */
 253 static int chk_bcast_mcast_addr(sdla_t* card, struct net_device* dev,
 254                                 struct sk_buff *skb);
 255 static int reply_udp( unsigned char *data, unsigned int mbox_len );
 256 static int intr_test( sdla_t* card);
 257 static int udp_pkt_type( struct sk_buff *skb , sdla_t* card);
 258 static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
 259                                 struct sk_buff *skb, struct net_device* dev,
 260                                 chdlc_private_area_t* chdlc_priv_area);
 261 static int process_udp_mgmt_pkt(sdla_t* card, struct net_device* dev,
 262                                 chdlc_private_area_t* chdlc_priv_area);
 263 static unsigned short calc_checksum (char *, int);
 264 static void s508_lock (sdla_t *card, unsigned long *smp_flags);
 265 static void s508_unlock (sdla_t *card, unsigned long *smp_flags);
 266
 267
 268 static int  Intr_test_counter;
 269
 270 /* TTY Global Definitions */
 271
 272 #define NR_PORTS 4
 273 #define WAN_TTY_MAJOR 226
 274 #define WAN_TTY_MINOR 0
 275
 276 #define WAN_CARD(port) (tty_card_map[port])
 277 #define MIN_PORT 0
 278 #define MAX_PORT NR_PORTS-1
 279
 280 #define CRC_LENGTH 2
 281
 282 static int wanpipe_tty_init(sdla_t *card);
 283 static void wanpipe_tty_receive(sdla_t *, unsigned, unsigned int);
 284 static void wanpipe_tty_trigger_poll(sdla_t *card);
 285
 286 static struct tty_driver serial_driver;
 287 static int tty_init_cnt=0;
 288
 289 static struct serial_state rs_table[NR_PORTS];
 290
 291 static char tty_driver_mode=WANOPT_TTY_SYNC;
 292
 293 static char *opt_decode[] = {"NONE","CRTSCTS","XONXOFF-RX",
 294                              "CRTSCTS XONXOFF-RX","XONXOFF-TX",
 295                              "CRTSCTS XONXOFF-TX","CRTSCTS XONXOFF"};
 296 static char *p_decode[] = {"NONE","ODD","EVEN"};
 297
 298 static void* tty_card_map[NR_PORTS] = {NULL,NULL,NULL,NULL};
 299
 300
 301 /****** Public Functions ****************************************************/
 302
 303 /*============================================================================
 304  * Cisco HDLC protocol initialization routine.
 305  *
 306  * This routine is called by the main WANPIPE module during setup.  At this
 307  * point adapter is completely initialized and firmware is running.
 308  *  o read firmware version (to make sure it's alive)
 309  *  o configure adapter
 310  *  o initialize protocol-specific fields of the adapter data space.
 311  *
 312  * Return:      0       o.k.
 313  *              < 0     failure.
 314  */
 315 int wpc_init (sdla_t* card, wandev_conf_t* conf)
 316 {
 317         unsigned char port_num;
 318         int err;
 319         unsigned long max_permitted_baud = 0;
 320         SHARED_MEMORY_INFO_STRUCT *flags;
 321
 322         union
 323                 {
 324                 char str[80];
 325                 } u;
 326         volatile CHDLC_MAILBOX_STRUCT* mb;
 327         CHDLC_MAILBOX_STRUCT* mb1;
 328         unsigned long timeout;
 329
 330         /* Verify configuration ID */
 331         if (conf->config_id != WANCONFIG_CHDLC) {
 332                 printk(KERN_INFO "%s: invalid configuration ID %u!\n",
 333                                   card->devname, conf->config_id);
 334                 return -EINVAL;
 335         }
 336
 337         /* Find out which Port to use */
 338         if ((conf->comm_port == WANOPT_PRI) || (conf->comm_port == WANOPT_SEC)){
 339                 if (card->next){
 340
 341                         if (conf->comm_port != card->next->u.c.comm_port){
 342                                 card->u.c.comm_port = conf->comm_port;
 343                         }else{
 344                                 printk(KERN_INFO "%s: ERROR - %s port used!\n",
 345                                         card->wandev.name, PORT(conf->comm_port));
 346                                 return -EINVAL;
 347                         }
 348                 }else{
 349                         card->u.c.comm_port = conf->comm_port;
 350                 }
 351         }else{
 352                 printk(KERN_INFO "%s: ERROR - Invalid Port Selected!\n",
 353                                         card->wandev.name);
 354                 return -EINVAL;
 355         }
 356
 357
 358         /* Initialize protocol-specific fields */
 359         if(card->hw.type != SDLA_S514){
 360
 361                 if (card->u.c.comm_port == WANOPT_PRI){
 362                         card->mbox  = (void *) card->hw.dpmbase;
 363                 }else{
 364                         card->mbox  = (void *) card->hw.dpmbase +
 365                                 SEC_BASE_ADDR_MB_STRUCT - PRI_BASE_ADDR_MB_STRUCT;
 366                 }
 367         }else{
 368                 /* for a S514 adapter, set a pointer to the actual mailbox in the */
 369                 /* allocated virtual memory area */
 370                 if (card->u.c.comm_port == WANOPT_PRI){
 371                         card->mbox = (void *) card->hw.dpmbase + PRI_BASE_ADDR_MB_STRUCT;
 372                 }else{
 373                         card->mbox = (void *) card->hw.dpmbase + SEC_BASE_ADDR_MB_STRUCT;
 374                 }
 375         }
 376
 377         mb = mb1 = card->mbox;
 378
 379         if (!card->configured){
 380
 381                 /* The board will place an 'I' in the return code to indicate that it is
 382                 ready to accept commands.  We expect this to be completed in less
 383                 than 1 second. */
 384
 385                 timeout = jiffies;
 386                 while (mb->return_code != 'I')  /* Wait 1s for board to initialize */
 387                         if ((jiffies - timeout) > 1*HZ) break;
 388
 389                 if (mb->return_code != 'I') {
 390                         printk(KERN_INFO
 391                                 "%s: Initialization not completed by adapter\n",
 392                                 card->devname);
 393                         printk(KERN_INFO "Please contact Sangoma representative.\n");
 394                         return -EIO;
 395                 }
 396         }
 397
 398         /* Read firmware version.  Note that when adapter initializes, it
 399          * clears the mailbox, so it may appear that the first command was
 400          * executed successfully when in fact it was merely erased. To work
 401          * around this, we execute the first command twice.
 402          */
 403
 404         if (chdlc_read_version(card, u.str))
 405                 return -EIO;
 406
 407         printk(KERN_INFO "%s: Running Cisco HDLC firmware v%s\n",
 408                 card->devname, u.str);
 409
 410         card->isr                       = &wpc_isr;
 411         card->poll                      = NULL;
 412         card->exec                      = NULL;
 413         card->wandev.update             = &update;
 414         card->wandev.new_if             = &new_if;
 415         card->wandev.del_if             = NULL;
 416         card->wandev.udp_port           = conf->udp_port;
 417         card->disable_comm              = &disable_comm;
 418         card->wandev.new_if_cnt = 0;
 419
 420         /* reset the number of times the 'update()' proc has been called */
 421         card->u.c.update_call_count = 0;
 422
 423         card->wandev.ttl = conf->ttl;
 424         card->wandev.interface = conf->interface;
 425
 426         if ((card->u.c.comm_port == WANOPT_SEC && conf->interface == WANOPT_V35)&&
 427             card->hw.type != SDLA_S514){
 428                 printk(KERN_INFO "%s: ERROR - V35 Interface not supported on S508 %s port \n",
 429                         card->devname, PORT(card->u.c.comm_port));
 430                 return -EIO;
 431         }
 432
 433         card->wandev.clocking = conf->clocking;
 434
 435         port_num = card->u.c.comm_port;
 436
 437         /* in API mode, we can configure for "receive only" buffering */
 438         if(card->hw.type == SDLA_S514) {
 439                 card->u.c.receive_only = conf->receive_only;
 440                 if(conf->receive_only) {
 441                         printk(KERN_INFO
 442                                 "%s: Configured for 'receive only' mode\n",
 443                                 card->devname);
 444                 }
 445         }
 446
 447         /* Setup Port Bps */
 448
 449         if(card->wandev.clocking) {
 450                 if((port_num == WANOPT_PRI) || card->u.c.receive_only) {
 451                         /* For Primary Port 0 */
 452                         max_permitted_baud =
 453                                 (card->hw.type == SDLA_S514) ?
 454                                 PRI_MAX_BAUD_RATE_S514 :
 455                                 PRI_MAX_BAUD_RATE_S508;
 456
 457                 }else if(port_num == WANOPT_SEC) {
 458                         /* For Secondary Port 1 */
 459                         max_permitted_baud =
 460                                (card->hw.type == SDLA_S514) ?
 461                                 SEC_MAX_BAUD_RATE_S514 :
 462                                 SEC_MAX_BAUD_RATE_S508;
 463                         }
 464
 465                         if(conf->bps > max_permitted_baud) {
 466                                 conf->bps = max_permitted_baud;
 467                                 printk(KERN_INFO "%s: Baud too high!\n",
 468                                         card->wandev.name);
 469                                 printk(KERN_INFO "%s: Baud rate set to %lu bps\n",
 470                                         card->wandev.name, max_permitted_baud);
 471                         }
 472                         card->wandev.bps = conf->bps;
 473         }else{
 474                 card->wandev.bps = 0;
 475         }
 476
 477         /* Setup the Port MTU */
 478         if((port_num == WANOPT_PRI) || card->u.c.receive_only) {
 479
 480                 /* For Primary Port 0 */
 481                 card->wandev.mtu =
 482                         (conf->mtu >= MIN_LGTH_CHDLC_DATA_CFG) ?
 483                         min_t(unsigned int, conf->mtu, PRI_MAX_NO_DATA_BYTES_IN_FRAME) :
 484                         CHDLC_DFLT_DATA_LEN;
 485         } else if(port_num == WANOPT_SEC) {
 486                 /* For Secondary Port 1 */
 487                 card->wandev.mtu =
 488                         (conf->mtu >= MIN_LGTH_CHDLC_DATA_CFG) ?
 489                         min_t(unsigned int, conf->mtu, SEC_MAX_NO_DATA_BYTES_IN_FRAME) :
 490                         CHDLC_DFLT_DATA_LEN;
 491         }
 492
 493         /* Set up the interrupt status area */
 494         /* Read the CHDLC Configuration and obtain:
 495          *      Ptr to shared memory infor struct
 496          * Use this pointer to calculate the value of card->u.c.flags !
 497          */
 498         mb1->buffer_length = 0;
 499         mb1->command = READ_CHDLC_CONFIGURATION;
 500         err = sdla_exec(mb1) ? mb1->return_code : CMD_TIMEOUT;
 501         if(err != COMMAND_OK) {
 502                 if(card->hw.type != SDLA_S514)
 503                         enable_irq(card->hw.irq);
 504
 505                 chdlc_error(card, err, mb1);
 506                 return -EIO;
 507         }
 508
 509         if(card->hw.type == SDLA_S514){
 510                 card->u.c.flags = (void *)(card->hw.dpmbase +
 511                         (((CHDLC_CONFIGURATION_STRUCT *)mb1->data)->
 512                         ptr_shared_mem_info_struct));
 513         }else{
 514                 card->u.c.flags = (void *)(card->hw.dpmbase +
 515                         (((CHDLC_CONFIGURATION_STRUCT *)mb1->data)->
 516                         ptr_shared_mem_info_struct % SDLA_WINDOWSIZE));
 517         }
 518
 519         flags = card->u.c.flags;
 520
 521         /* This is for the ports link state */
 522         card->wandev.state = WAN_DUALPORT;
 523         card->u.c.state = WAN_DISCONNECTED;
 524
 525
 526         if (!card->wandev.piggyback){
 527                 int err;
 528
 529                 /* Perform interrupt testing */
 530                 err = intr_test(card);
 531
 532                 if(err || (Intr_test_counter < MAX_INTR_TEST_COUNTER)) {
 533                         printk(KERN_INFO "%s: Interrupt test failed (%i)\n",
 534                                         card->devname, Intr_test_counter);
 535                         printk(KERN_INFO "%s: Please choose another interrupt\n",
 536                                         card->devname);
 537                         return -EIO;
 538                 }
 539
 540                 printk(KERN_INFO "%s: Interrupt test passed (%i)\n",
 541                                 card->devname, Intr_test_counter);
 542                 card->configured = 1;
 543         }
 544
 545         if ((card->tty_opt=conf->tty) == WANOPT_YES){
 546                 int err;
 547                 card->tty_minor = conf->tty_minor;
 548
 549                 /* On ASYNC connections internal clocking
 550                  * is mandatory */
 551                 if ((card->u.c.async_mode = conf->tty_mode)){
 552                         card->wandev.clocking = 1;
 553                 }
 554                 err=wanpipe_tty_init(card);
 555                 if (err){
 556                         return err;
 557                 }
 558         }else{
 559
 560
 561                 if (chdlc_set_intr_mode(card, APP_INT_ON_TIMER)){
 562                         printk (KERN_INFO "%s: "
 563                                 "Failed to set interrupt triggers!\n",
 564                                 card->devname);
 565                         return -EIO;
 566                 }
 567
 568                 /* Mask the Timer interrupt */
 569                 flags->interrupt_info_struct.interrupt_permission &=
 570                         ~APP_INT_ON_TIMER;
 571         }
 572
 573         /* If we are using CHDLC in backup mode, this flag will
 574          * indicate not to look for IP addresses in config_chdlc()*/
 575         card->u.c.backup = conf->backup;
 576
 577         printk(KERN_INFO "\n");
 578
 579         return 0;
 580 }
 581
 582 /******* WAN Device Driver Entry Points *************************************/
 583
 584 /*============================================================================
 585  * Update device status & statistics
 586  * This procedure is called when updating the PROC file system and returns
 587  * various communications statistics. These statistics are accumulated from 3
 588  * different locations:
 589  *      1) The 'if_stats' recorded for the device.
 590  *      2) Communication error statistics on the adapter.
 591  *      3) CHDLC operational statistics on the adapter.
 592  * The board level statistics are read during a timer interrupt. Note that we
 593  * read the error and operational statistics during consecitive timer ticks so
 594  * as to minimize the time that we are inside the interrupt handler.
 595  *
 596  */
 597 static int update(struct wan_device* wandev)
 598 {
 599         sdla_t* card = wandev->private;
 600         struct net_device* dev;
 601         volatile chdlc_private_area_t* chdlc_priv_area;
 602         SHARED_MEMORY_INFO_STRUCT *flags;
 603         unsigned long timeout;
 604
 605         /* sanity checks */
 606         if((wandev == NULL) || (wandev->private == NULL))
 607                 return -EFAULT;
 608
 609         if(wandev->state == WAN_UNCONFIGURED)
 610                 return -ENODEV;
 611
 612         /* more sanity checks */
 613         if(!card->u.c.flags)
 614                 return -ENODEV;
 615
 616         if(test_bit(PERI_CRIT, (void*)&card->wandev.critical))
 617                 return -EAGAIN;
 618
 619         if((dev=card->wandev.dev) == NULL)
 620                 return -ENODEV;
 621
 622         if((chdlc_priv_area=dev->priv) == NULL)
 623                 return -ENODEV;
 624
 625         flags = card->u.c.flags;
 626         if(chdlc_priv_area->update_comms_stats){
 627                 return -EAGAIN;
 628         }
 629
 630         /* we will need 2 timer interrupts to complete the */
 631         /* reading of the statistics */
 632         chdlc_priv_area->update_comms_stats = 2;
 633         flags->interrupt_info_struct.interrupt_permission |= APP_INT_ON_TIMER;
 634         chdlc_priv_area->timer_int_enabled = TMR_INT_ENABLED_UPDATE;
 635
 636         /* wait a maximum of 1 second for the statistics to be updated */
 637         timeout = jiffies;
 638         for(;;) {
 639                 if(chdlc_priv_area->update_comms_stats == 0)
 640                         break;
 641                 if ((jiffies - timeout) > (1 * HZ)){
 642                         chdlc_priv_area->update_comms_stats = 0;
 643                         chdlc_priv_area->timer_int_enabled &=
 644                                 ~TMR_INT_ENABLED_UPDATE;
 645                         return -EAGAIN;
 646                 }
 647         }
 648
 649         return 0;
 650 }
 651
 652
 653 /*============================================================================
 654  * Create new logical channel.
 655  * This routine is called by the router when ROUTER_IFNEW IOCTL is being
 656  * handled.
 657  * o parse media- and hardware-specific configuration
 658  * o make sure that a new channel can be created
 659  * o allocate resources, if necessary
 660  * o prepare network device structure for registaration.
 661  *
 662  * Return:      0       o.k.
 663  *              < 0     failure (channel will not be created)
 664  */
 665 static int new_if(struct wan_device* wandev, struct net_device* dev,
 666                   wanif_conf_t* conf)
 667 {
 668         sdla_t* card = wandev->private;
 669         chdlc_private_area_t* chdlc_priv_area;
 670
 671
 672         printk(KERN_INFO "%s: Configuring Interface: %s\n",
 673                         card->devname, conf->name);
 674
 675         if ((conf->name[0] == '\0') || (strlen(conf->name) > WAN_IFNAME_SZ)) {
 676                 printk(KERN_INFO "%s: Invalid interface name!\n",
 677                         card->devname);
 678                 return -EINVAL;
 679         }
 680
 681         /* allocate and initialize private data */
 682         chdlc_priv_area = kmalloc(sizeof(chdlc_private_area_t), GFP_KERNEL);
 683
 684         if(chdlc_priv_area == NULL)
 685                 return -ENOMEM;
 686
 687         memset(chdlc_priv_area, 0, sizeof(chdlc_private_area_t));
 688
 689         chdlc_priv_area->card = card;
 690         chdlc_priv_area->common.sk = NULL;
 691         chdlc_priv_area->common.func = NULL;
 692
 693         /* initialize data */
 694         strcpy(card->u.c.if_name, conf->name);
 695
 696         if(card->wandev.new_if_cnt > 0) {
 697                 kfree(chdlc_priv_area);
 698                 return -EEXIST;
 699         }
 700
 701         card->wandev.new_if_cnt++;
 702
 703         chdlc_priv_area->TracingEnabled = 0;
 704         chdlc_priv_area->route_status = NO_ROUTE;
 705         chdlc_priv_area->route_removed = 0;
 706
 707         card->u.c.async_mode = conf->async_mode;
 708
 709         /* setup for asynchronous mode */
 710         if(conf->async_mode) {
 711                 printk(KERN_INFO "%s: Configuring for asynchronous mode\n",
 712                         wandev->name);
 713
 714                 if(card->u.c.comm_port == WANOPT_PRI) {
 715                         printk(KERN_INFO
 716                                 "%s:Asynchronous mode on secondary port only\n",
 717                                         wandev->name);
 718                         kfree(chdlc_priv_area);
 719                         return -EINVAL;
 720                 }
 721
 722                 if(strcmp(conf->usedby, "WANPIPE") == 0) {
 723                         printk(KERN_INFO
 724                                 "%s: Running in WANIPE Async Mode\n",                                                           wandev->name);
 725                         card->u.c.usedby = WANPIPE;
 726                 }else{
 727                         card->u.c.usedby = API;
 728                 }
 729
 730                 if(!card->wandev.clocking) {
 731                         printk(KERN_INFO
 732                                 "%s: Asynch. clocking must be 'Internal'\n",
 733                                 wandev->name);
 734                         kfree(chdlc_priv_area);
 735                         return -EINVAL;
 736                 }
 737
 738                 if((card->wandev.bps < MIN_ASY_BAUD_RATE) ||
 739                         (card->wandev.bps > MAX_ASY_BAUD_RATE)) {
 740                         printk(KERN_INFO "%s: Selected baud rate is invalid.\n",
 741                                 wandev->name);
 742                         printk(KERN_INFO "Must be between %u and %u bps.\n",
 743                                 MIN_ASY_BAUD_RATE, MAX_ASY_BAUD_RATE);
 744                         kfree(chdlc_priv_area);
 745                         return -EINVAL;
 746                 }
 747
 748                 card->u.c.api_options = 0;
 749                 if (conf->asy_data_trans == WANOPT_YES) {
 750                         card->u.c.api_options |= ASY_RX_DATA_TRANSPARENT;
 751                 }
 752
 753                 card->u.c.protocol_options = 0;
 754                 if (conf->rts_hs_for_receive == WANOPT_YES) {
 755                         card->u.c.protocol_options |= ASY_RTS_HS_FOR_RX;
 756                 }
 757                 if (conf->xon_xoff_hs_for_receive == WANOPT_YES) {
 758                         card->u.c.protocol_options |= ASY_XON_XOFF_HS_FOR_RX;
 759                 }
 760                 if (conf->xon_xoff_hs_for_transmit == WANOPT_YES) {
 761                         card->u.c.protocol_options |= ASY_XON_XOFF_HS_FOR_TX;
 762                 }
 763                 if (conf->dcd_hs_for_transmit == WANOPT_YES) {
 764                         card->u.c.protocol_options |= ASY_DCD_HS_FOR_TX;
 765                 }
 766                 if (conf->cts_hs_for_transmit == WANOPT_YES) {
 767                         card->u.c.protocol_options |= ASY_CTS_HS_FOR_TX;
 768                 }
 769
 770                 card->u.c.tx_bits_per_char = conf->tx_bits_per_char;
 771                 card->u.c.rx_bits_per_char = conf->rx_bits_per_char;
 772                 card->u.c.stop_bits = conf->stop_bits;
 773                 card->u.c.parity = conf->parity;
 774                 card->u.c.break_timer = conf->break_timer;
 775                 card->u.c.inter_char_timer = conf->inter_char_timer;
 776                 card->u.c.rx_complete_length = conf->rx_complete_length;
 777                 card->u.c.xon_char = conf->xon_char;
 778
 779         } else {        /* setup for synchronous mode */
 780
 781                 card->u.c.protocol_options = 0;
 782                 if (conf->ignore_dcd == WANOPT_YES){
 783                         card->u.c.protocol_options |= IGNORE_DCD_FOR_LINK_STAT;
 784                 }
 785                 if (conf->ignore_cts == WANOPT_YES){
 786                         card->u.c.protocol_options |= IGNORE_CTS_FOR_LINK_STAT;
 787                 }
 788
 789                 if (conf->ignore_keepalive == WANOPT_YES) {
 790                         card->u.c.protocol_options |=
 791                                 IGNORE_KPALV_FOR_LINK_STAT;
 792                         card->u.c.kpalv_tx  = MIN_Tx_KPALV_TIMER;
 793                         card->u.c.kpalv_rx  = MIN_Rx_KPALV_TIMER;
 794                         card->u.c.kpalv_err = MIN_KPALV_ERR_TOL;
 795
 796                 } else {   /* Do not ignore keepalives */
 797                         card->u.c.kpalv_tx =
 798                                 ((conf->keepalive_tx_tmr - MIN_Tx_KPALV_TIMER)
 799                                 >= 0) ?
 800                                 min_t(unsigned int, conf->keepalive_tx_tmr,MAX_Tx_KPALV_TIMER) :
 801                                 DEFAULT_Tx_KPALV_TIMER;
 802
 803                         card->u.c.kpalv_rx =
 804                                 ((conf->keepalive_rx_tmr - MIN_Rx_KPALV_TIMER)
 805                                 >= 0) ?
 806                                 min_t(unsigned int, conf->keepalive_rx_tmr,MAX_Rx_KPALV_TIMER) :
 807                                 DEFAULT_Rx_KPALV_TIMER;
 808
 809                         card->u.c.kpalv_err =
 810                                 ((conf->keepalive_err_margin-MIN_KPALV_ERR_TOL)
 811                                 >= 0) ?
 812                                 min_t(unsigned int, conf->keepalive_err_margin,
 813                                 MAX_KPALV_ERR_TOL) :
 814                                 DEFAULT_KPALV_ERR_TOL;
 815                 }
 816
 817                 /* Setup slarp timer to control delay between slarps */
 818                 card->u.c.slarp_timer =
 819                         ((conf->slarp_timer - MIN_SLARP_REQ_TIMER) >= 0) ?
 820                         min_t(unsigned int, conf->slarp_timer, MAX_SLARP_REQ_TIMER) :
 821                         DEFAULT_SLARP_REQ_TIMER;
 822
 823                 if (conf->hdlc_streaming == WANOPT_YES) {
 824                         printk(KERN_INFO "%s: Enabling HDLC STREAMING Mode\n",
 825                                 wandev->name);
 826                         card->u.c.protocol_options = HDLC_STREAMING_MODE;
 827                 }
 828
 829                 if ((chdlc_priv_area->true_if_encoding = conf->true_if_encoding) == WANOPT_YES){
 830                         printk(KERN_INFO
 831                                 "%s: Enabling, true interface type encoding.\n",
 832                                 card->devname);
 833                 }
 834
 835                 /* Setup wanpipe as a router (WANPIPE) or as an API */
 836                 if( strcmp(conf->usedby, "WANPIPE") == 0) {
 837
 838                         printk(KERN_INFO "%s: Running in WANPIPE mode!\n",
 839                                 wandev->name);
 840                         card->u.c.usedby = WANPIPE;
 841
 842                         /* Option to bring down the interface when
 843                          * the link goes down */
 844                         if (conf->if_down){
 845                                 set_bit(DYN_OPT_ON,&chdlc_priv_area->interface_down);
 846                                 printk(KERN_INFO
 847                                  "%s: Dynamic interface configuration enabled\n",
 848                                    card->devname);
 849                         }
 850
 851                 } else if( strcmp(conf->usedby, "API") == 0) {
 852                         card->u.c.usedby = API;
 853                         printk(KERN_INFO "%s: Running in API mode !\n",
 854                                 wandev->name);
 855                 }
 856         }
 857
 858         /* Tells us that if this interface is a
 859          * gateway or not */
 860         if ((chdlc_priv_area->gateway = conf->gateway) == WANOPT_YES){
 861                 printk(KERN_INFO "%s: Interface %s is set as a gateway.\n",
 862                         card->devname,card->u.c.if_name);
 863         }
 864
 865         /* Get Multicast Information */
 866         chdlc_priv_area->mc = conf->mc;
 867
 868         /* prepare network device data space for registration */
 869         strcpy(dev->name,card->u.c.if_name);
 870
 871         dev->init = &if_init;
 872         dev->priv = chdlc_priv_area;
 873
 874         /* Initialize the polling work routine */
 875         INIT_WORK(&chdlc_priv_area->poll_work, (void*)(void*)chdlc_poll, dev);
 876
 877         /* Initialize the polling delay timer */
 878         init_timer(&chdlc_priv_area->poll_delay_timer);
 879         chdlc_priv_area->poll_delay_timer.data = (unsigned long)dev;
 880         chdlc_priv_area->poll_delay_timer.function = chdlc_poll_delay;
 881
 882         printk(KERN_INFO "\n");
 883
 884         return 0;
 885 }
 886
 887
 888 /****** Network Device Interface ********************************************/
 889
 890 /*============================================================================
 891  * Initialize Linux network interface.
 892  *
 893  * This routine is called only once for each interface, during Linux network
 894  * interface registration.  Returning anything but zero will fail interface
 895  * registration.
 896  */
 897 static int if_init(struct net_device* dev)
 898 {
 899         chdlc_private_area_t* chdlc_priv_area = dev->priv;
 900         sdla_t* card = chdlc_priv_area->card;
 901         struct wan_device* wandev = &card->wandev;
 902
 903         /* Initialize device driver entry points */
 904         dev->open               = &if_open;
 905         dev->stop               = &if_close;
 906         dev->hard_header        = &if_header;
 907         dev->rebuild_header     = &if_rebuild_hdr;
 908         dev->hard_start_xmit    = &if_send;
 909         dev->get_stats          = &if_stats;
 910         dev->tx_timeout         = &if_tx_timeout;
 911         dev->watchdog_timeo     = TX_TIMEOUT;
 912
 913         /* Initialize media-specific parameters */
 914         dev->flags              |= IFF_POINTOPOINT;
 915         dev->flags              |= IFF_NOARP;
 916
 917         /* Enable Mulitcasting if user selected */
 918         if (chdlc_priv_area->mc == WANOPT_YES){
 919                 dev->flags      |= IFF_MULTICAST;
 920         }
 921
 922         if (chdlc_priv_area->true_if_encoding){
 923                 dev->type       = ARPHRD_HDLC; /* This breaks the tcpdump */
 924         }else{
 925                 dev->type       = ARPHRD_PPP;
 926         }
 927
 928         dev->mtu                = card->wandev.mtu;
 929         /* for API usage, add the API header size to the requested MTU size */
 930         if(card->u.c.usedby == API) {
 931                 dev->mtu += sizeof(api_tx_hdr_t);
 932         }
 933
 934         dev->hard_header_len    = CHDLC_HDR_LEN;
 935
 936         /* Initialize hardware parameters */
 937         dev->irq        = wandev->irq;
 938         dev->dma        = wandev->dma;
 939         dev->base_addr  = wandev->ioport;
 940         dev->mem_start  = wandev->maddr;
 941         dev->mem_end    = wandev->maddr + wandev->msize - 1;
 942
 943         /* Set transmit buffer queue length
 944          * If too low packets will not be retransmitted
 945          * by stack.
 946          */
 947         dev->tx_queue_len = 100;
 948         SET_MODULE_OWNER(dev);
 949
 950         return 0;
 951 }
 952
 953 /*============================================================================
 954  * Open network interface.
 955  * o enable communications and interrupts.
 956  * o prevent module from unloading by incrementing use count
 957  *
 958  * Return 0 if O.k. or errno.
 959  */
 960 static int if_open(struct net_device* dev)
 961 {
 962         chdlc_private_area_t* chdlc_priv_area = dev->priv;
 963         sdla_t* card = chdlc_priv_area->card;
 964         struct timeval tv;
 965         int err = 0;
 966
 967         /* Only one open per interface is allowed */
 968
 969         if (netif_running(dev))
 970                 return -EBUSY;
 971
 972         /* Initialize the work queue entry */
 973         chdlc_priv_area->tq_working=0;
 974
 975         INIT_WORK(&chdlc_priv_area->common.wanpipe_work,
 976                         (void *)(void *)chdlc_work, dev);
 977
 978         /* Allocate and initialize BH circular buffer */
 979         /* Add 1 to MAX_BH_BUFF so we don't have test with (MAX_BH_BUFF-1) */
 980         chdlc_priv_area->bh_head = kmalloc((sizeof(bh_data_t)*(MAX_BH_BUFF+1)),GFP_ATOMIC);
 981         memset(chdlc_priv_area->bh_head,0,(sizeof(bh_data_t)*(MAX_BH_BUFF+1)));
 982         atomic_set(&chdlc_priv_area->bh_buff_used, 0);
 983
 984         do_gettimeofday(&tv);
 985         chdlc_priv_area->router_start_time = tv.tv_sec;
 986
 987         netif_start_queue(dev);
 988
 989         wanpipe_open(card);
 990
 991         /* TTY is configured during wanpipe_set_termios
 992          * call, not here */
 993         if (card->tty_opt)
 994                 return err;
 995
 996         set_bit(0,&chdlc_priv_area->config_chdlc);
 997         chdlc_priv_area->config_chdlc_timeout=jiffies;
 998
 999         /* Start the CHDLC configuration after 1sec delay.
1000          * This will give the interface initilization time
1001          * to finish its configuration */
1002         mod_timer(&chdlc_priv_area->poll_delay_timer, jiffies + HZ);
1003         return err;
1004 }
1005
1006 /*============================================================================
1007  * Close network interface.
1008  * o if this is the last close, then disable communications and interrupts.
1009  * o reset flags.
1010  */
1011 static int if_close(struct net_device* dev)
1012 {
1013         chdlc_private_area_t* chdlc_priv_area = dev->priv;
1014         sdla_t* card = chdlc_priv_area->card;
1015
1016         if (chdlc_priv_area->bh_head){
1017                 int i;
1018                 struct sk_buff *skb;
1019
1020                 for (i=0; i<(MAX_BH_BUFF+1); i++){
1021                         skb = ((bh_data_t *)&chdlc_priv_area->bh_head[i])->skb;
1022                         if (skb != NULL){
1023                                 dev_kfree_skb_any(skb);
1024                         }
1025                 }
1026                 kfree(chdlc_priv_area->bh_head);
1027                 chdlc_priv_area->bh_head=NULL;
1028         }
1029
1030         netif_stop_queue(dev);
1031         wanpipe_close(card);
1032         del_timer(&chdlc_priv_area->poll_delay_timer);
1033         return 0;
1034 }
1035
1036 static void disable_comm (sdla_t *card)
1037 {
1038         SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
1039
1040         if (card->u.c.comm_enabled){
1041                 chdlc_disable_comm_shutdown (card);
1042         }else{
1043                 flags->interrupt_info_struct.interrupt_permission = 0;
1044         }
1045
1046         if (!tty_init_cnt)
1047                 return;
1048
1049         if (card->tty_opt){
1050                 struct serial_state * state;
1051                 if (!(--tty_init_cnt)){
1052                         int e1;
1053                         serial_driver.refcount=0;
1054
1055                         if ((e1 = tty_unregister_driver(&serial_driver)))
1056                                 printk("SERIAL: failed to unregister serial driver (%d)\n",
1057                                        e1);
1058                         printk(KERN_INFO "%s: Unregistering TTY Driver, Major %i\n",
1059                                         card->devname,WAN_TTY_MAJOR);
1060                 }
1061                 card->tty=NULL;
1062                 tty_card_map[card->tty_minor]=NULL;
1063                 state = &rs_table[card->tty_minor];
1064                 memset(state, 0, sizeof(*state));
1065         }
1066         return;
1067 }
1068
1069
1070 /*============================================================================
1071  * Build media header.
1072  *
1073  * The trick here is to put packet type (Ethertype) into 'protocol' field of
1074  * the socket buffer, so that we don't forget it.  If packet type is not
1075  * supported, set skb->protocol to 0 and discard packet later.
1076  *
1077  * Return:      media header length.
1078  */
1079 static int if_header(struct sk_buff* skb, struct net_device* dev,
1080                      unsigned short type, void* daddr, void* saddr,
1081                      unsigned len)
1082 {
1083         skb->protocol = htons(type);
1084
1085         return CHDLC_HDR_LEN;
1086 }
1087
1088
1089 /*============================================================================
1090  * Handle transmit timeout event from netif watchdog
1091  */
1092 static void if_tx_timeout(struct net_device *dev)
1093 {
1094         chdlc_private_area_t* chan = dev->priv;
1095         sdla_t *card = chan->card;
1096
1097         /* If our device stays busy for at least 5 seconds then we will
1098          * kick start the device by making dev->tbusy = 0.  We expect
1099          * that our device never stays busy more than 5 seconds. So this
1100          * is only used as a last resort.
1101          */
1102
1103         ++card->wandev.stats.collisions;
1104
1105         printk (KERN_INFO "%s: Transmit timed out on %s\n", card->devname,dev->name);
1106         netif_wake_queue (dev);
1107 }
1108
1109
1110
1111 /*============================================================================
1112  * Re-build media header.
1113  *
1114  * Return:      1       physical address resolved.
1115  *              0       physical address not resolved
1116  */
1117 static int if_rebuild_hdr (struct sk_buff *skb)
1118 {
1119         return 1;
1120 }
1121
1122
1123 /*============================================================================
1124  * Send a packet on a network interface.
1125  * o set tbusy flag (marks start of the transmission) to block a timer-based
1126  *   transmit from overlapping.
1127  * o check link state. If link is not up, then drop the packet.
1128  * o execute adapter send command.
1129  * o free socket buffer
1130  *
1131  * Return:      0       complete (socket buffer must be freed)
1132  *              non-0   packet may be re-transmitted (tbusy must be set)
1133  *
1134  * Notes:
1135  * 1. This routine is called either by the protocol stack or by the "net
1136  *    bottom half" (with interrupts enabled).
1137  * 2. Setting tbusy flag will inhibit further transmit requests from the
1138  *    protocol stack and can be used for flow control with protocol layer.
1139  */
1140 static int if_send(struct sk_buff* skb, struct net_device* dev)
1141 {
1142         chdlc_private_area_t *chdlc_priv_area = dev->priv;
1143         sdla_t *card = chdlc_priv_area->card;
1144         SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
1145         INTERRUPT_INFORMATION_STRUCT *chdlc_int = &flags->interrupt_info_struct;
1146         int udp_type = 0;
1147         unsigned long smp_flags;
1148         int err=0;
1149
1150         netif_stop_queue(dev);
1151
1152         if (skb == NULL){
1153                 /* If we get here, some higher layer thinks we've missed an
1154                  * tx-done interrupt.
1155                  */
1156                 printk(KERN_INFO "%s: interface %s got kicked!\n",
1157                         card->devname, dev->name);
1158
1159                 netif_wake_queue(dev);
1160                 return 0;
1161         }
1162
1163         if (ntohs(skb->protocol) != htons(PVC_PROT)){
1164
1165                 /* check the udp packet type */
1166
1167                 udp_type = udp_pkt_type(skb, card);
1168
1169                 if (udp_type == UDP_CPIPE_TYPE){
1170                         if(store_udp_mgmt_pkt(UDP_PKT_FRM_STACK, card, skb, dev,
1171                                 chdlc_priv_area)){
1172                                 chdlc_int->interrupt_permission |=
1173                                         APP_INT_ON_TIMER;
1174                         }
1175                         netif_start_queue(dev);
1176                         return 0;
1177                 }
1178
1179                 /* check to see if the source IP address is a broadcast or */
1180                 /* multicast IP address */
1181                 if(chk_bcast_mcast_addr(card, dev, skb)){
1182                         ++card->wandev.stats.tx_dropped;
1183                         dev_kfree_skb_any(skb);
1184                         netif_start_queue(dev);
1185                         return 0;
1186                 }
1187         }
1188
1189         /* Lock the 508 Card: SMP is supported */
1190         if(card->hw.type != SDLA_S514){
1191                 s508_lock(card,&smp_flags);
1192         }
1193
1194         if(test_and_set_bit(SEND_CRIT, (void*)&card->wandev.critical)) {
1195
1196                 printk(KERN_INFO "%s: Critical in if_send: %lx\n",
1197                                         card->wandev.name,card->wandev.critical);
1198                 ++card->wandev.stats.tx_dropped;
1199                 netif_start_queue(dev);
1200                 goto if_send_exit_crit;
1201         }
1202
1203         if(card->u.c.state != WAN_CONNECTED){
1204                 ++card->wandev.stats.tx_dropped;
1205                 netif_start_queue(dev);
1206
1207         }else if(!skb->protocol){
1208                 ++card->wandev.stats.tx_errors;
1209                 netif_start_queue(dev);
1210
1211         }else {
1212                 void* data = skb->data;
1213                 unsigned len = skb->len;
1214                 unsigned char attr;
1215
1216                 /* If it's an API packet pull off the API
1217                  * header. Also check that the packet size
1218                  * is larger than the API header
1219                  */
1220                 if (card->u.c.usedby == API){
1221                         api_tx_hdr_t* api_tx_hdr;
1222
1223                         /* discard the frame if we are configured for */
1224                         /* 'receive only' mode or if there is no data */
1225                         if (card->u.c.receive_only ||
1226                                 (len <= sizeof(api_tx_hdr_t))) {
1227
1228                                 ++card->wandev.stats.tx_dropped;
1229                                 netif_start_queue(dev);
1230                                 goto if_send_exit_crit;
1231                         }
1232
1233                         api_tx_hdr = (api_tx_hdr_t *)data;
1234                         attr = api_tx_hdr->attr;
1235                         data += sizeof(api_tx_hdr_t);
1236                         len -= sizeof(api_tx_hdr_t);
1237                 }
1238
1239                 if(chdlc_send(card, data, len)) {
1240                         netif_stop_queue(dev);
1241                 }else{
1242                         ++card->wandev.stats.tx_packets;
1243                         card->wandev.stats.tx_bytes += len;
1244
1245                         netif_start_queue(dev);
1246
1247                         dev->trans_start = jiffies;
1248                 }
1249         }
1250
1251 if_send_exit_crit:
1252
1253         if (!(err=netif_queue_stopped(dev))) {
1254                 dev_kfree_skb_any(skb);
1255         }else{
1256                 chdlc_priv_area->tick_counter = jiffies;
1257                 chdlc_int->interrupt_permission |= APP_INT_ON_TX_FRAME;
1258         }
1259
1260         clear_bit(SEND_CRIT, (void*)&card->wandev.critical);
1261         if(card->hw.type != SDLA_S514){
1262                 s508_unlock(card,&smp_flags);
1263         }
1264
1265         return err;
1266 }
1267
1268
1269 /*============================================================================
1270  * Check to see if the packet to be transmitted contains a broadcast or
1271  * multicast source IP address.
1272  */
1273
1274 static int chk_bcast_mcast_addr(sdla_t *card, struct net_device* dev,
1275                                 struct sk_buff *skb)
1276 {
1277         u32 src_ip_addr;
1278         u32 broadcast_ip_addr = 0;
1279         struct in_device *in_dev;
1280
1281         /* read the IP source address from the outgoing packet */
1282         src_ip_addr = *(u32 *)(skb->data + 12);
1283
1284         /* read the IP broadcast address for the device */
1285         in_dev = dev->ip_ptr;
1286         if(in_dev != NULL) {
1287                 struct in_ifaddr *ifa= in_dev->ifa_list;
1288                 if(ifa != NULL)
1289                         broadcast_ip_addr = ifa->ifa_broadcast;
1290                 else
1291                         return 0;
1292         }
1293
1294         /* check if the IP Source Address is a Broadcast address */
1295         if((dev->flags & IFF_BROADCAST) && (src_ip_addr == broadcast_ip_addr)) {
1296                 printk(KERN_INFO "%s: Broadcast Source Address silently discarded\n",
1297                                 card->devname);
1298                 return 1;
1299         }
1300
1301         /* check if the IP Source Address is a Multicast address */
1302         if((ntohl(src_ip_addr) >= 0xE0000001) &&
1303                 (ntohl(src_ip_addr) <= 0xFFFFFFFE)) {
1304                 printk(KERN_INFO "%s: Multicast Source Address silently discarded\n",
1305                                 card->devname);
1306                 return 1;
1307         }
1308
1309         return 0;
1310 }
1311
1312
1313 /*============================================================================
1314  * Reply to UDP Management system.
1315  * Return length of reply.
1316  */
1317 static int reply_udp( unsigned char *data, unsigned int mbox_len )
1318 {
1319
1320         unsigned short len, udp_length, temp, ip_length;
1321         unsigned long ip_temp;
1322         int even_bound = 0;
1323         chdlc_udp_pkt_t *c_udp_pkt = (chdlc_udp_pkt_t *)data;
1324
1325         /* Set length of packet */
1326         len = sizeof(ip_pkt_t)+
1327               sizeof(udp_pkt_t)+
1328               sizeof(wp_mgmt_t)+
1329               sizeof(cblock_t)+
1330               sizeof(trace_info_t)+
1331               mbox_len;
1332
1333         /* fill in UDP reply */
1334         c_udp_pkt->wp_mgmt.request_reply = UDPMGMT_REPLY;
1335
1336         /* fill in UDP length */
1337         udp_length = sizeof(udp_pkt_t)+
1338                      sizeof(wp_mgmt_t)+
1339                      sizeof(cblock_t)+
1340                      sizeof(trace_info_t)+
1341                      mbox_len;
1342
1343         /* put it on an even boundary */
1344         if ( udp_length & 0x0001 ) {
1345                 udp_length += 1;
1346                 len += 1;
1347                 even_bound = 1;
1348         }
1349
1350         temp = (udp_length<<8)|(udp_length>>8);
1351         c_udp_pkt->udp_pkt.udp_length = temp;
1352
1353         /* swap UDP ports */
1354         temp = c_udp_pkt->udp_pkt.udp_src_port;
1355         c_udp_pkt->udp_pkt.udp_src_port =
1356                         c_udp_pkt->udp_pkt.udp_dst_port;
1357         c_udp_pkt->udp_pkt.udp_dst_port = temp;
1358
1359         /* add UDP pseudo header */
1360         temp = 0x1100;
1361         *((unsigned short *)(c_udp_pkt->data+mbox_len+even_bound)) = temp;
1362         temp = (udp_length<<8)|(udp_length>>8);
1363         *((unsigned short *)(c_udp_pkt->data+mbox_len+even_bound+2)) = temp;
1364
1365
1366         /* calculate UDP checksum */
1367         c_udp_pkt->udp_pkt.udp_checksum = 0;
1368         c_udp_pkt->udp_pkt.udp_checksum = calc_checksum(&data[UDP_OFFSET],udp_length+UDP_OFFSET);
1369
1370         /* fill in IP length */
1371         ip_length = len;
1372         temp = (ip_length<<8)|(ip_length>>8);
1373         c_udp_pkt->ip_pkt.total_length = temp;
1374
1375         /* swap IP addresses */
1376         ip_temp = c_udp_pkt->ip_pkt.ip_src_address;
1377         c_udp_pkt->ip_pkt.ip_src_address = c_udp_pkt->ip_pkt.ip_dst_address;
1378         c_udp_pkt->ip_pkt.ip_dst_address = ip_temp;
1379
1380         /* fill in IP checksum */
1381         c_udp_pkt->ip_pkt.hdr_checksum = 0;
1382         c_udp_pkt->ip_pkt.hdr_checksum = calc_checksum(data,sizeof(ip_pkt_t));
1383
1384         return len;
1385
1386 } /* reply_udp */
1387
1388 unsigned short calc_checksum (char *data, int len)
1389 {
1390         unsigned short temp;
1391         unsigned long sum=0;
1392         int i;
1393
1394         for( i = 0; i <len; i+=2 ) {
1395                 memcpy(&temp,&data[i],2);
1396                 sum += (unsigned long)temp;
1397         }
1398
1399         while (sum >> 16 ) {
1400                 sum = (sum & 0xffffUL) + (sum >> 16);
1401         }
1402
1403         temp = (unsigned short)sum;
1404         temp = ~temp;
1405
1406         if( temp == 0 )
1407                 temp = 0xffff;
1408
1409         return temp;
1410 }
1411
1412
1413 /*============================================================================
1414  * Get ethernet-style interface statistics.
1415  * Return a pointer to struct enet_statistics.
1416  */
1417 static struct net_device_stats* if_stats(struct net_device* dev)
1418 {
1419         sdla_t *my_card;
1420         chdlc_private_area_t* chdlc_priv_area;
1421
1422         if ((chdlc_priv_area=dev->priv) == NULL)
1423                 return NULL;
1424
1425         my_card = chdlc_priv_area->card;
1426         return &my_card->wandev.stats;
1427 }
1428
1429
1430 /****** Cisco HDLC Firmware Interface Functions *******************************/
1431
1432 /*============================================================================
1433  * Read firmware code version.
1434  *      Put code version as ASCII string in str.
1435  */
1436 static int chdlc_read_version (sdla_t* card, char* str)
1437 {
1438         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
1439         int len;
1440         char err;
1441         mb->buffer_length = 0;
1442         mb->command = READ_CHDLC_CODE_VERSION;
1443         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
1444
1445         if(err != COMMAND_OK) {
1446                 chdlc_error(card,err,mb);
1447         }
1448         else if (str) {  /* is not null */
1449                 len = mb->buffer_length;
1450                 memcpy(str, mb->data, len);
1451                 str[len] = '\0';
1452         }
1453         return (err);
1454 }
1455
1456 /*-----------------------------------------------------------------------------
1457  *  Configure CHDLC firmware.
1458  */
1459 static int chdlc_configure (sdla_t* card, void* data)
1460 {
1461         int err;
1462         CHDLC_MAILBOX_STRUCT *mailbox = card->mbox;
1463         int data_length = sizeof(CHDLC_CONFIGURATION_STRUCT);
1464
1465         mailbox->buffer_length = data_length;
1466         memcpy(mailbox->data, data, data_length);
1467         mailbox->command = SET_CHDLC_CONFIGURATION;
1468         err = sdla_exec(mailbox) ? mailbox->return_code : CMD_TIMEOUT;
1469
1470         if (err != COMMAND_OK) chdlc_error (card, err, mailbox);
1471
1472         return err;
1473 }
1474
1475
1476 /*============================================================================
1477  * Set interrupt mode -- HDLC Version.
1478  */
1479
1480 static int chdlc_set_intr_mode (sdla_t* card, unsigned mode)
1481 {
1482         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
1483         CHDLC_INT_TRIGGERS_STRUCT* int_data =
1484                  (CHDLC_INT_TRIGGERS_STRUCT *)mb->data;
1485         int err;
1486
1487         int_data->CHDLC_interrupt_triggers      = mode;
1488         int_data->IRQ                           = card->hw.irq;
1489         int_data->interrupt_timer               = 1;
1490
1491         mb->buffer_length = sizeof(CHDLC_INT_TRIGGERS_STRUCT);
1492         mb->command = SET_CHDLC_INTERRUPT_TRIGGERS;
1493         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
1494         if (err != COMMAND_OK)
1495                 chdlc_error (card, err, mb);
1496         return err;
1497 }
1498
1499
1500 /*===========================================================
1501  * chdlc_disable_comm_shutdown
1502  *
1503  * Shutdown() disables the communications. We must
1504  * have a sparate functions, because we must not
1505  * call chdlc_error() hander since the private
1506  * area has already been replaced */
1507
1508 static int chdlc_disable_comm_shutdown (sdla_t *card)
1509 {
1510         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
1511         CHDLC_INT_TRIGGERS_STRUCT* int_data =
1512                  (CHDLC_INT_TRIGGERS_STRUCT *)mb->data;
1513         int err;
1514
1515         /* Disable Interrutps */
1516         int_data->CHDLC_interrupt_triggers      = 0;
1517         int_data->IRQ                           = card->hw.irq;
1518         int_data->interrupt_timer               = 1;
1519
1520         mb->buffer_length = sizeof(CHDLC_INT_TRIGGERS_STRUCT);
1521         mb->command = SET_CHDLC_INTERRUPT_TRIGGERS;
1522         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
1523
1524         /* Disable Communications */
1525
1526         if (card->u.c.async_mode) {
1527                 mb->command = DISABLE_ASY_COMMUNICATIONS;
1528         }else{
1529                 mb->command = DISABLE_CHDLC_COMMUNICATIONS;
1530         }
1531
1532         mb->buffer_length = 0;
1533         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
1534
1535         card->u.c.comm_enabled = 0;
1536
1537         return 0;
1538 }
1539
1540 /*============================================================================
1541  * Enable communications.
1542  */
1543
1544 static int chdlc_comm_enable (sdla_t* card)
1545 {
1546         int err;
1547         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
1548
1549         mb->buffer_length = 0;
1550         mb->command = ENABLE_CHDLC_COMMUNICATIONS;
1551         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
1552         if (err != COMMAND_OK)
1553                 chdlc_error(card, err, mb);
1554         else
1555                 card->u.c.comm_enabled = 1;
1556
1557         return err;
1558 }
1559
1560 /*============================================================================
1561  * Read communication error statistics.
1562  */
1563 static int chdlc_read_comm_err_stats (sdla_t* card)
1564 {
1565         int err;
1566         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
1567
1568         mb->buffer_length = 0;
1569         mb->command = READ_COMMS_ERROR_STATS;
1570         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
1571         if (err != COMMAND_OK)
1572                 chdlc_error(card,err,mb);
1573         return err;
1574 }
1575
1576
1577 /*============================================================================
1578  * Read CHDLC operational statistics.
1579  */
1580 static int chdlc_read_op_stats (sdla_t* card)
1581 {
1582         int err;
1583         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
1584
1585         mb->buffer_length = 0;
1586         mb->command = READ_CHDLC_OPERATIONAL_STATS;
1587         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
1588         if (err != COMMAND_OK)
1589                 chdlc_error(card,err,mb);
1590         return err;
1591 }
1592
1593
1594 /*============================================================================
1595  * Update communications error and general packet statistics.
1596  */
1597 static int update_comms_stats(sdla_t* card,
1598         chdlc_private_area_t* chdlc_priv_area)
1599 {
1600         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
1601         COMMS_ERROR_STATS_STRUCT* err_stats;
1602         CHDLC_OPERATIONAL_STATS_STRUCT *op_stats;
1603
1604         /* on the first timer interrupt, read the comms error statistics */
1605         if(chdlc_priv_area->update_comms_stats == 2) {
1606                 if(chdlc_read_comm_err_stats(card))
1607                         return 1;
1608                 err_stats = (COMMS_ERROR_STATS_STRUCT *)mb->data;
1609                 card->wandev.stats.rx_over_errors =
1610                                 err_stats->Rx_overrun_err_count;
1611                 card->wandev.stats.rx_crc_errors =
1612                                 err_stats->CRC_err_count;
1613                 card->wandev.stats.rx_frame_errors =
1614                                 err_stats->Rx_abort_count;
1615                 card->wandev.stats.rx_fifo_errors =
1616                                 err_stats->Rx_dis_pri_bfrs_full_count;
1617                 card->wandev.stats.rx_missed_errors =
1618                                 card->wandev.stats.rx_fifo_errors;
1619                 card->wandev.stats.tx_aborted_errors =
1620                                 err_stats->sec_Tx_abort_count;
1621         }
1622
1623         /* on the second timer interrupt, read the operational statistics */
1624         else {
1625                 if(chdlc_read_op_stats(card))
1626                         return 1;
1627                 op_stats = (CHDLC_OPERATIONAL_STATS_STRUCT *)mb->data;
1628                 card->wandev.stats.rx_length_errors =
1629                         (op_stats->Rx_Data_discard_short_count +
1630                         op_stats->Rx_Data_discard_long_count);
1631         }
1632
1633         return 0;
1634 }
1635
1636 /*============================================================================
1637  * Send packet.
1638  *      Return: 0 - o.k.
1639  *              1 - no transmit buffers available
1640  */
1641 static int chdlc_send (sdla_t* card, void* data, unsigned len)
1642 {
1643         CHDLC_DATA_TX_STATUS_EL_STRUCT *txbuf = card->u.c.txbuf;
1644
1645         if (txbuf->opp_flag)
1646                 return 1;
1647
1648         sdla_poke(&card->hw, txbuf->ptr_data_bfr, data, len);
1649
1650         txbuf->frame_length = len;
1651         txbuf->opp_flag = 1;            /* start transmission */
1652
1653         /* Update transmit buffer control fields */
1654         card->u.c.txbuf = ++txbuf;
1655
1656         if ((void*)txbuf > card->u.c.txbuf_last)
1657                 card->u.c.txbuf = card->u.c.txbuf_base;
1658
1659         return 0;
1660 }
1661
1662 /****** Firmware Error Handler **********************************************/
1663
1664 /*============================================================================
1665  * Firmware error handler.
1666  *      This routine is called whenever firmware command returns non-zero
1667  *      return code.
1668  *
1669  * Return zero if previous command has to be cancelled.
1670  */
1671 static int chdlc_error (sdla_t *card, int err, CHDLC_MAILBOX_STRUCT *mb)
1672 {
1673         unsigned cmd = mb->command;
1674
1675         switch (err) {
1676
1677         case CMD_TIMEOUT:
1678                 printk(KERN_INFO "%s: command 0x%02X timed out!\n",
1679                         card->devname, cmd);
1680                 break;
1681
1682         case S514_BOTH_PORTS_SAME_CLK_MODE:
1683                 if(cmd == SET_CHDLC_CONFIGURATION) {
1684                         printk(KERN_INFO
1685                          "%s: Configure both ports for the same clock source\n",
1686                                 card->devname);
1687                         break;
1688                 }
1689
1690         default:
1691                 printk(KERN_INFO "%s: command 0x%02X returned 0x%02X!\n",
1692                         card->devname, cmd, err);
1693         }
1694
1695         return 0;
1696 }
1697
1698
1699 /********** Bottom Half Handlers ********************************************/
1700
1701 /* NOTE: There is no API, BH support for Kernels lower than 2.2.X.
1702  *       DO NOT INSERT ANY CODE HERE, NOTICE THE
1703  *       PREPROCESSOR STATEMENT ABOVE, UNLESS YOU KNOW WHAT YOU ARE
1704  *       DOING */
1705
1706 static void chdlc_work(struct net_device * dev)
1707 {
1708         chdlc_private_area_t* chan = dev->priv;
1709         sdla_t *card = chan->card;
1710         struct sk_buff *skb;
1711
1712         if (atomic_read(&chan->bh_buff_used) == 0){
1713                 clear_bit(0, &chan->tq_working);
1714                 return;
1715         }
1716
1717         while (atomic_read(&chan->bh_buff_used)){
1718
1719                 skb  = ((bh_data_t *)&chan->bh_head[chan->bh_read])->skb;
1720
1721                 if (skb != NULL){
1722
1723                         if (chan->common.sk == NULL || chan->common.func == NULL){
1724                                 ++card->wandev.stats.rx_dropped;
1725                                 dev_kfree_skb_any(skb);
1726                                 chdlc_work_cleanup(dev);
1727                                 continue;
1728                         }
1729
1730                         if (chan->common.func(skb,dev,chan->common.sk) != 0){
1731                                 /* Sock full cannot send, queue us for another
1732                                  * try */
1733                                 atomic_set(&chan->common.receive_block,1);
1734                                 return;
1735                         }else{
1736                                 chdlc_work_cleanup(dev);
1737                         }
1738                 }else{
1739                         chdlc_work_cleanup(dev);
1740                 }
1741         }
1742         clear_bit(0, &chan->tq_working);
1743
1744         return;
1745 }
1746
1747 static int chdlc_work_cleanup(struct net_device *dev)
1748 {
1749         chdlc_private_area_t* chan = dev->priv;
1750
1751         ((bh_data_t *)&chan->bh_head[chan->bh_read])->skb = NULL;
1752
1753         if (chan->bh_read == MAX_BH_BUFF){
1754                 chan->bh_read=0;
1755         }else{
1756                 ++chan->bh_read;
1757         }
1758
1759         atomic_dec(&chan->bh_buff_used);
1760         return 0;
1761 }
1762
1763
1764
1765 static int bh_enqueue(struct net_device *dev, struct sk_buff *skb)
1766 {
1767         /* Check for full */
1768         chdlc_private_area_t* chan = dev->priv;
1769         sdla_t *card = chan->card;
1770
1771         if (atomic_read(&chan->bh_buff_used) == (MAX_BH_BUFF+1)){
1772                 ++card->wandev.stats.rx_dropped;
1773                 dev_kfree_skb_any(skb);
1774                 return 1;
1775         }
1776
1777         ((bh_data_t *)&chan->bh_head[chan->bh_write])->skb = skb;
1778
1779         if (chan->bh_write == MAX_BH_BUFF){
1780                 chan->bh_write=0;
1781         }else{
1782                 ++chan->bh_write;
1783         }
1784
1785         atomic_inc(&chan->bh_buff_used);
1786
1787         return 0;
1788 }
1789
1790 /* END OF API BH Support */
1791
1792
1793 /****** Interrupt Handlers **************************************************/
1794
1795 /*============================================================================
1796  * Cisco HDLC interrupt service routine.
1797  */
1798 static void wpc_isr (sdla_t* card)
1799 {
1800         struct net_device* dev;
1801         SHARED_MEMORY_INFO_STRUCT* flags = NULL;
1802         int i;
1803         sdla_t *my_card;
1804
1805
1806         /* Check for which port the interrupt has been generated
1807          * Since Secondary Port is piggybacking on the Primary
1808          * the check must be done here.
1809          */
1810
1811         flags = card->u.c.flags;
1812         if (!flags->interrupt_info_struct.interrupt_type){
1813                 /* Check for a second port (piggybacking) */
1814                 if ((my_card = card->next)){
1815                         flags = my_card->u.c.flags;
1816                         if (flags->interrupt_info_struct.interrupt_type){
1817                                 card = my_card;
1818                                 card->isr(card);
1819                                 return;
1820                         }
1821                 }
1822         }
1823
1824         flags = card->u.c.flags;
1825         card->in_isr = 1;
1826         dev = card->wandev.dev;
1827
1828         /* If we get an interrupt with no network device, stop the interrupts
1829          * and issue an error */
1830         if (!card->tty_opt && !dev &&
1831             flags->interrupt_info_struct.interrupt_type !=
1832                 COMMAND_COMPLETE_APP_INT_PEND){
1833
1834                 goto isr_done;
1835         }
1836
1837         /* if critical due to peripheral operations
1838          * ie. update() or getstats() then reset the interrupt and
1839          * wait for the board to retrigger.
1840          */
1841         if(test_bit(PERI_CRIT, (void*)&card->wandev.critical)) {
1842                 printk(KERN_INFO "ISR CRIT TO PERI\n");
1843                 goto isr_done;
1844         }
1845
1846         /* On a 508 Card, if critical due to if_send
1847          * Major Error !!! */
1848         if(card->hw.type != SDLA_S514) {
1849                 if(test_bit(SEND_CRIT, (void*)&card->wandev.critical)) {
1850                         printk(KERN_INFO "%s: Critical while in ISR: %lx\n",
1851                                 card->devname, card->wandev.critical);
1852                         card->in_isr = 0;
1853                         flags->interrupt_info_struct.interrupt_type = 0;
1854                         return;
1855                 }
1856         }
1857
1858         switch(flags->interrupt_info_struct.interrupt_type) {
1859
1860         case RX_APP_INT_PEND:   /* 0x01: receive interrupt */
1861                 rx_intr(card);
1862                 break;
1863
1864         case TX_APP_INT_PEND:   /* 0x02: transmit interrupt */
1865                 flags->interrupt_info_struct.interrupt_permission &=
1866                          ~APP_INT_ON_TX_FRAME;
1867
1868                 if (card->tty_opt){
1869                         wanpipe_tty_trigger_poll(card);
1870                         break;
1871                 }
1872
1873                 if (dev && netif_queue_stopped(dev)){
1874                         if (card->u.c.usedby == API){
1875                                 netif_start_queue(dev);
1876                                 wakeup_sk_bh(dev);
1877                         }else{
1878                                 netif_wake_queue(dev);
1879                         }
1880                 }
1881                 break;
1882
1883         case COMMAND_COMPLETE_APP_INT_PEND:/* 0x04: cmd cplt */
1884                 ++ Intr_test_counter;
1885                 break;
1886
1887         case CHDLC_EXCEP_COND_APP_INT_PEND:     /* 0x20 */
1888                 process_chdlc_exception(card);
1889                 break;
1890
1891         case GLOBAL_EXCEP_COND_APP_INT_PEND:
1892                 process_global_exception(card);
1893                 break;
1894
1895         case TIMER_APP_INT_PEND:
1896                 timer_intr(card);
1897                 break;
1898
1899         default:
1900                 printk(KERN_INFO "%s: spurious interrupt 0x%02X!\n",
1901                         card->devname,
1902                         flags->interrupt_info_struct.interrupt_type);
1903                 printk(KERN_INFO "Code name: ");
1904                 for(i = 0; i < 4; i ++)
1905                         printk(KERN_INFO "%c",
1906                                 flags->global_info_struct.codename[i]);
1907                 printk(KERN_INFO "\nCode version: ");
1908                 for(i = 0; i < 4; i ++)
1909                         printk(KERN_INFO "%c",
1910                                 flags->global_info_struct.codeversion[i]);
1911                 printk(KERN_INFO "\n");
1912                 break;
1913         }
1914
1915 isr_done:
1916
1917         card->in_isr = 0;
1918         flags->interrupt_info_struct.interrupt_type = 0;
1919         return;
1920 }
1921
1922 /*============================================================================
1923  * Receive interrupt handler.
1924  */
1925 static void rx_intr (sdla_t* card)
1926 {
1927         struct net_device *dev;
1928         chdlc_private_area_t *chdlc_priv_area;
1929         SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
1930         CHDLC_DATA_RX_STATUS_EL_STRUCT *rxbuf = card->u.c.rxmb;
1931         struct sk_buff *skb;
1932         unsigned len;
1933         unsigned addr = rxbuf->ptr_data_bfr;
1934         void *buf;
1935         int i,udp_type;
1936
1937         if (rxbuf->opp_flag != 0x01) {
1938                 printk(KERN_INFO
1939                         "%s: corrupted Rx buffer @ 0x%X, flag = 0x%02X!\n",
1940                         card->devname, (unsigned)rxbuf, rxbuf->opp_flag);
1941                 printk(KERN_INFO "Code name: ");
1942                 for(i = 0; i < 4; i ++)
1943                         printk(KERN_INFO "%c",
1944                                 flags->global_info_struct.codename[i]);
1945                 printk(KERN_INFO "\nCode version: ");
1946                 for(i = 0; i < 4; i ++)
1947                         printk(KERN_INFO "%c",
1948                                 flags->global_info_struct.codeversion[i]);
1949                 printk(KERN_INFO "\n");
1950
1951
1952                 /* Bug Fix: Mar 6 2000
1953                  * If we get a corrupted mailbox, it measn that driver
1954                  * is out of sync with the firmware. There is no recovery.
1955                  * If we don't turn off all interrupts for this card
1956                  * the machine will crash.
1957                  */
1958                 printk(KERN_INFO "%s: Critical router failure ...!!!\n", card->devname);
1959                 printk(KERN_INFO "Please contact Sangoma Technologies !\n");
1960                 chdlc_set_intr_mode(card,0);
1961                 return;
1962         }
1963
1964         len  = rxbuf->frame_length;
1965
1966         if (card->tty_opt){
1967
1968                 if (rxbuf->error_flag){
1969                         goto rx_exit;
1970                 }
1971
1972                 if (len <= CRC_LENGTH){
1973                         goto rx_exit;
1974                 }
1975
1976                 if (!card->u.c.async_mode){
1977                         len -= CRC_LENGTH;
1978                 }
1979
1980                 wanpipe_tty_receive(card,addr,len);
1981                 goto rx_exit;
1982         }
1983
1984         dev = card->wandev.dev;
1985
1986         if (!dev){
1987                 goto rx_exit;
1988         }
1989
1990         if (!netif_running(dev))
1991                 goto rx_exit;
1992
1993         chdlc_priv_area = dev->priv;
1994
1995
1996         /* Allocate socket buffer */
1997         skb = dev_alloc_skb(len);
1998
1999         if (skb == NULL) {
2000                 printk(KERN_INFO "%s: no socket buffers available!\n",
2001                                         card->devname);
2002                 ++card->wandev.stats.rx_dropped;
2003                 goto rx_exit;
2004         }
2005
2006         /* Copy data to the socket buffer */
2007         if((addr + len) > card->u.c.rx_top + 1) {
2008                 unsigned tmp = card->u.c.rx_top - addr + 1;
2009                 buf = skb_put(skb, tmp);
2010                 sdla_peek(&card->hw, addr, buf, tmp);
2011                 addr = card->u.c.rx_base;
2012                 len -= tmp;
2013         }
2014
2015         buf = skb_put(skb, len);
2016         sdla_peek(&card->hw, addr, buf, len);
2017
2018         skb->protocol = htons(ETH_P_IP);
2019
2020         card->wandev.stats.rx_packets ++;
2021         card->wandev.stats.rx_bytes += skb->len;
2022         udp_type = udp_pkt_type( skb, card );
2023
2024         if(udp_type == UDP_CPIPE_TYPE) {
2025                 if(store_udp_mgmt_pkt(UDP_PKT_FRM_NETWORK,
2026                                       card, skb, dev, chdlc_priv_area)) {
2027                         flags->interrupt_info_struct.
2028                                                 interrupt_permission |=
2029                                                         APP_INT_ON_TIMER;
2030                 }
2031         } else if(card->u.c.usedby == API) {
2032
2033                 api_rx_hdr_t* api_rx_hdr;
2034                 skb_push(skb, sizeof(api_rx_hdr_t));
2035                 api_rx_hdr = (api_rx_hdr_t*)&skb->data[0x00];
2036                 api_rx_hdr->error_flag = rxbuf->error_flag;
2037                 api_rx_hdr->time_stamp = rxbuf->time_stamp;
2038
2039                 skb->protocol = htons(PVC_PROT);
2040                 skb->mac.raw  = skb->data;
2041                 skb->dev      = dev;
2042                 skb->pkt_type = WAN_PACKET_DATA;
2043
2044                 bh_enqueue(dev, skb);
2045
2046                 if (!test_and_set_bit(0,&chdlc_priv_area->tq_working))
2047                         wanpipe_queue_work(&chdlc_priv_area->common.wanpipe_work);
2048         }else{
2049                 /* FIXME: we should check to see if the received packet is a
2050                           multicast packet so that we can increment the multicast
2051                           statistic
2052                           ++ chdlc_priv_area->if_stats.multicast;
2053                 */
2054                 /* Pass it up the protocol stack */
2055
2056                 skb->dev = dev;
2057                 skb->mac.raw  = skb->data;
2058                 netif_rx(skb);
2059                 dev->last_rx = jiffies;
2060         }
2061
2062 rx_exit:
2063         /* Release buffer element and calculate a pointer to the next one */
2064         rxbuf->opp_flag = 0x00;
2065         card->u.c.rxmb = ++ rxbuf;
2066         if((void*)rxbuf > card->u.c.rxbuf_last){
2067                 card->u.c.rxmb = card->u.c.rxbuf_base;
2068         }
2069 }
2070
2071 /*============================================================================
2072  * Timer interrupt handler.
2073  * The timer interrupt is used for two purposes:
2074  *    1) Processing udp calls from 'cpipemon'.
2075  *    2) Reading board-level statistics for updating the proc file system.
2076  */
2077 void timer_intr(sdla_t *card)
2078 {
2079         struct net_device* dev;
2080         chdlc_private_area_t* chdlc_priv_area = NULL;
2081         SHARED_MEMORY_INFO_STRUCT* flags = NULL;
2082
2083         if ((dev = card->wandev.dev)==NULL){
2084                 flags = card->u.c.flags;
2085                 flags->interrupt_info_struct.interrupt_permission &=
2086                         ~APP_INT_ON_TIMER;
2087                 return;
2088         }
2089
2090         chdlc_priv_area = dev->priv;
2091
2092         if (chdlc_priv_area->timer_int_enabled & TMR_INT_ENABLED_CONFIG) {
2093                 if (!config_chdlc(card)){
2094                         chdlc_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_CONFIG;
2095                 }
2096         }
2097
2098         /* process a udp call if pending */
2099         if(chdlc_priv_area->timer_int_enabled & TMR_INT_ENABLED_UDP) {
2100                 process_udp_mgmt_pkt(card, dev,
2101                        chdlc_priv_area);
2102                 chdlc_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_UDP;
2103         }
2104
2105         /* read the communications statistics if required */
2106         if(chdlc_priv_area->timer_int_enabled & TMR_INT_ENABLED_UPDATE) {
2107                 update_comms_stats(card, chdlc_priv_area);
2108                 if(!(-- chdlc_priv_area->update_comms_stats)) {
2109                         chdlc_priv_area->timer_int_enabled &=
2110                                 ~TMR_INT_ENABLED_UPDATE;
2111                 }
2112         }
2113
2114         /* only disable the timer interrupt if there are no udp or statistic */
2115         /* updates pending */
2116         if(!chdlc_priv_area->timer_int_enabled) {
2117                 flags = card->u.c.flags;
2118                 flags->interrupt_info_struct.interrupt_permission &=
2119                         ~APP_INT_ON_TIMER;
2120         }
2121 }
2122
2123 /*------------------------------------------------------------------------------
2124   Miscellaneous Functions
2125         - set_chdlc_config() used to set configuration options on the board
2126 ------------------------------------------------------------------------------*/
2127
2128 static int set_chdlc_config(sdla_t* card)
2129 {
2130         CHDLC_CONFIGURATION_STRUCT cfg;
2131
2132         memset(&cfg, 0, sizeof(CHDLC_CONFIGURATION_STRUCT));
2133
2134         if(card->wandev.clocking){
2135                 cfg.baud_rate = card->wandev.bps;
2136         }
2137
2138         cfg.line_config_options = (card->wandev.interface == WANOPT_RS232) ?
2139                 INTERFACE_LEVEL_RS232 : INTERFACE_LEVEL_V35;
2140
2141         cfg.modem_config_options        = 0;
2142         cfg.modem_status_timer          = 100;
2143
2144         cfg.CHDLC_protocol_options      = card->u.c.protocol_options;
2145
2146         if (card->tty_opt){
2147                 cfg.CHDLC_API_options   = DISCARD_RX_ERROR_FRAMES;
2148         }
2149
2150         cfg.percent_data_buffer_for_Tx  = (card->u.c.receive_only) ? 0 : 50;
2151         cfg.CHDLC_statistics_options    = (CHDLC_TX_DATA_BYTE_COUNT_STAT |
2152                 CHDLC_RX_DATA_BYTE_COUNT_STAT);
2153
2154         if (card->tty_opt){
2155                 card->wandev.mtu = TTY_CHDLC_MAX_MTU;
2156         }
2157         cfg.max_CHDLC_data_field_length = card->wandev.mtu;
2158         cfg.transmit_keepalive_timer    = card->u.c.kpalv_tx;
2159         cfg.receive_keepalive_timer     = card->u.c.kpalv_rx;
2160         cfg.keepalive_error_tolerance   = card->u.c.kpalv_err;
2161         cfg.SLARP_request_timer         = card->u.c.slarp_timer;
2162
2163         if (cfg.SLARP_request_timer) {
2164                 cfg.IP_address          = 0;
2165                 cfg.IP_netmask          = 0;
2166
2167         }else if (card->wandev.dev){
2168                 struct net_device *dev = card->wandev.dev;
2169                 chdlc_private_area_t *chdlc_priv_area = dev->priv;
2170
2171                 struct in_device *in_dev = dev->ip_ptr;
2172
2173                 if(in_dev != NULL) {
2174                         struct in_ifaddr *ifa = in_dev->ifa_list;
2175
2176                         if (ifa != NULL ) {
2177                                 cfg.IP_address  = ntohl(ifa->ifa_local);
2178                                 cfg.IP_netmask  = ntohl(ifa->ifa_mask);
2179                                 chdlc_priv_area->IP_address = ntohl(ifa->ifa_local);
2180                                 chdlc_priv_area->IP_netmask = ntohl(ifa->ifa_mask);
2181                         }
2182                 }
2183
2184                 /* FIXME: We must re-think this message in next release
2185                 if((cfg.IP_address & 0x000000FF) > 2) {
2186                         printk(KERN_WARNING "\n");
2187                         printk(KERN_WARNING "  WARNING:%s configured with an\n",
2188                                 card->devname);
2189                         printk(KERN_WARNING "  invalid local IP address.\n");
2190                         printk(KERN_WARNING "  Slarp pragmatics will fail.\n");
2191                         printk(KERN_WARNING "  IP address should be of the\n");
2192                         printk(KERN_WARNING "  format A.B.C.1 or A.B.C.2.\n");
2193                 }
2194                 */
2195         }
2196
2197         return chdlc_configure(card, &cfg);
2198 }
2199
2200
2201 /*-----------------------------------------------------------------------------
2202    set_asy_config() used to set asynchronous configuration options on the board
2203 ------------------------------------------------------------------------------*/
2204
2205 static int set_asy_config(sdla_t* card)
2206 {
2207
2208         ASY_CONFIGURATION_STRUCT cfg;
2209         CHDLC_MAILBOX_STRUCT *mailbox = card->mbox;
2210         int err;
2211
2212         memset(&cfg, 0, sizeof(ASY_CONFIGURATION_STRUCT));
2213
2214         if(card->wandev.clocking)
2215                 cfg.baud_rate = card->wandev.bps;
2216
2217         cfg.line_config_options = (card->wandev.interface == WANOPT_RS232) ?
2218                 INTERFACE_LEVEL_RS232 : INTERFACE_LEVEL_V35;
2219
2220         cfg.modem_config_options        = 0;
2221         cfg.asy_API_options             = card->u.c.api_options;
2222         cfg.asy_protocol_options        = card->u.c.protocol_options;
2223         cfg.Tx_bits_per_char            = card->u.c.tx_bits_per_char;
2224         cfg.Rx_bits_per_char            = card->u.c.rx_bits_per_char;
2225         cfg.stop_bits                   = card->u.c.stop_bits;
2226         cfg.parity                      = card->u.c.parity;
2227         cfg.break_timer                 = card->u.c.break_timer;
2228         cfg.asy_Rx_inter_char_timer     = card->u.c.inter_char_timer;
2229         cfg.asy_Rx_complete_length      = card->u.c.rx_complete_length;
2230         cfg.XON_char                    = card->u.c.xon_char;
2231         cfg.XOFF_char                   = card->u.c.xoff_char;
2232         cfg.asy_statistics_options      = (CHDLC_TX_DATA_BYTE_COUNT_STAT |
2233                 CHDLC_RX_DATA_BYTE_COUNT_STAT);
2234
2235         mailbox->buffer_length = sizeof(ASY_CONFIGURATION_STRUCT);
2236         memcpy(mailbox->data, &cfg, mailbox->buffer_length);
2237         mailbox->command = SET_ASY_CONFIGURATION;
2238         err = sdla_exec(mailbox) ? mailbox->return_code : CMD_TIMEOUT;
2239         if (err != COMMAND_OK)
2240                 chdlc_error (card, err, mailbox);
2241         return err;
2242 }
2243
2244 /*============================================================================
2245  * Enable asynchronous communications.
2246  */
2247
2248 static int asy_comm_enable (sdla_t* card)
2249 {
2250
2251         int err;
2252         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
2253
2254         mb->buffer_length = 0;
2255         mb->command = ENABLE_ASY_COMMUNICATIONS;
2256         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
2257         if (err != COMMAND_OK && card->wandev.dev)
2258                 chdlc_error(card, err, mb);
2259
2260         if (!err)
2261                 card->u.c.comm_enabled = 1;
2262
2263         return err;
2264 }
2265
2266 /*============================================================================
2267  * Process global exception condition
2268  */
2269 static int process_global_exception(sdla_t *card)
2270 {
2271         CHDLC_MAILBOX_STRUCT* mbox = card->mbox;
2272         int err;
2273
2274         mbox->buffer_length = 0;
2275         mbox->command = READ_GLOBAL_EXCEPTION_CONDITION;
2276         err = sdla_exec(mbox) ? mbox->return_code : CMD_TIMEOUT;
2277
2278         if(err != CMD_TIMEOUT ){
2279
2280                 switch(mbox->return_code) {
2281
2282                 case EXCEP_MODEM_STATUS_CHANGE:
2283
2284                         printk(KERN_INFO "%s: Modem status change\n",
2285                                 card->devname);
2286
2287                         switch(mbox->data[0] & (DCD_HIGH | CTS_HIGH)) {
2288                                 case (DCD_HIGH):
2289                                         printk(KERN_INFO "%s: DCD high, CTS low\n",card->devname);
2290                                         break;
2291                                 case (CTS_HIGH):
2292                                         printk(KERN_INFO "%s: DCD low, CTS high\n",card->devname);
2293                                         break;
2294                                 case ((DCD_HIGH | CTS_HIGH)):
2295                                         printk(KERN_INFO "%s: DCD high, CTS high\n",card->devname);
2296                                         break;
2297                                 default:
2298                                         printk(KERN_INFO "%s: DCD low, CTS low\n",card->devname);
2299                                         break;
2300                         }
2301                         break;
2302
2303                 case EXCEP_TRC_DISABLED:
2304                         printk(KERN_INFO "%s: Line trace disabled\n",
2305                                 card->devname);
2306                         break;
2307
2308                 case EXCEP_IRQ_TIMEOUT:
2309                         printk(KERN_INFO "%s: IRQ timeout occurred\n",
2310                                 card->devname);
2311                         break;
2312
2313                 case 0x17:
2314                         if (card->tty_opt){
2315                                 if (card->tty && card->tty_open){
2316                                         printk(KERN_INFO
2317                                                 "%s: Modem Hangup Exception: Hanging Up!\n",
2318                                                 card->devname);
2319                                         tty_hangup(card->tty);
2320                                 }
2321                                 break;
2322                         }
2323
2324                         /* If TTY is not used just drop throught */
2325
2326                 default:
2327                         printk(KERN_INFO "%s: Global exception %x\n",
2328                                 card->devname, mbox->return_code);
2329                         break;
2330                 }
2331         }
2332         return 0;
2333 }
2334
2335
2336 /*============================================================================
2337  * Process chdlc exception condition
2338  */
2339 static int process_chdlc_exception(sdla_t *card)
2340 {
2341         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
2342         int err;
2343
2344         mb->buffer_length = 0;
2345         mb->command = READ_CHDLC_EXCEPTION_CONDITION;
2346         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
2347         if(err != CMD_TIMEOUT) {
2348
2349                 switch (err) {
2350
2351                 case EXCEP_LINK_ACTIVE:
2352                         port_set_state(card, WAN_CONNECTED);
2353                         trigger_chdlc_poll(card->wandev.dev);
2354                         break;
2355
2356                 case EXCEP_LINK_INACTIVE_MODEM:
2357                         port_set_state(card, WAN_DISCONNECTED);
2358                         unconfigure_ip(card);
2359                         trigger_chdlc_poll(card->wandev.dev);
2360                         break;
2361
2362                 case EXCEP_LINK_INACTIVE_KPALV:
2363                         port_set_state(card, WAN_DISCONNECTED);
2364                         printk(KERN_INFO "%s: Keepalive timer expired.\n",
2365                                                 card->devname);
2366                         unconfigure_ip(card);
2367                         trigger_chdlc_poll(card->wandev.dev);
2368                         break;
2369
2370                 case EXCEP_IP_ADDRESS_DISCOVERED:
2371                         if (configure_ip(card))
2372                                 return -1;
2373                         break;
2374
2375                 case EXCEP_LOOPBACK_CONDITION:
2376                         printk(KERN_INFO "%s: Loopback Condition Detected.\n",
2377                                                 card->devname);
2378                         break;
2379
2380                 case NO_CHDLC_EXCEP_COND_TO_REPORT:
2381                         printk(KERN_INFO "%s: No exceptions reported.\n",
2382                                                 card->devname);
2383                         break;
2384                 }
2385
2386         }
2387         return 0;
2388 }
2389
2390
2391 /*============================================================================
2392  * Configure IP from SLARP negotiation
2393  * This adds dynamic routes when SLARP has provided valid addresses
2394  */
2395
2396 static int configure_ip (sdla_t* card)
2397 {
2398         struct net_device *dev = card->wandev.dev;
2399         chdlc_private_area_t *chdlc_priv_area;
2400         char err;
2401
2402         if (!dev)
2403                 return 0;
2404
2405         chdlc_priv_area = dev->priv;
2406
2407
2408         /* set to discover */
2409         if(card->u.c.slarp_timer != 0x00) {
2410                 CHDLC_MAILBOX_STRUCT* mb = card->mbox;
2411                 CHDLC_CONFIGURATION_STRUCT *cfg;
2412
2413                 mb->buffer_length = 0;
2414                 mb->command = READ_CHDLC_CONFIGURATION;
2415                 err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
2416
2417                 if(err != COMMAND_OK) {
2418                         chdlc_error(card,err,mb);
2419                         return -1;
2420                 }
2421
2422                 cfg = (CHDLC_CONFIGURATION_STRUCT *)mb->data;
2423                 chdlc_priv_area->IP_address = cfg->IP_address;
2424                 chdlc_priv_area->IP_netmask = cfg->IP_netmask;
2425
2426                 /* Set flag to add route */
2427                 chdlc_priv_area->route_status = ADD_ROUTE;
2428
2429                 /* The idea here is to add the route in the poll routine.
2430                 This way, we aren't in interrupt context when adding routes */
2431                 trigger_chdlc_poll(dev);
2432         }
2433
2434         return 0;
2435 }
2436
2437
2438 /*============================================================================
2439  * Un-Configure IP negotiated by SLARP
2440  * This removes dynamic routes when the link becomes inactive.
2441  */
2442
2443 static int unconfigure_ip (sdla_t* card)
2444 {
2445         struct net_device *dev = card->wandev.dev;
2446         chdlc_private_area_t *chdlc_priv_area;
2447
2448         if (!dev)
2449                 return 0;
2450
2451         chdlc_priv_area= dev->priv;
2452
2453         if (chdlc_priv_area->route_status == ROUTE_ADDED) {
2454
2455                 /* Note: If this function is called, the
2456                  * port state has been DISCONNECTED.  This state
2457                  * change will trigger a poll_disconnected
2458                  * function, that will check for this condition.
2459                  */
2460                 chdlc_priv_area->route_status = REMOVE_ROUTE;
2461
2462         }
2463         return 0;
2464 }
2465
2466 /*============================================================================
2467  * Routine to add/remove routes
2468  * Called like a polling routine when Routes are flagged to be added/removed.
2469  */
2470
2471 static void process_route (sdla_t *card)
2472 {
2473         struct net_device *dev = card->wandev.dev;
2474         unsigned char port_num;
2475         chdlc_private_area_t *chdlc_priv_area = NULL;
2476         u32 local_IP_addr = 0;
2477         u32 remote_IP_addr = 0;
2478         u32 IP_netmask, IP_addr;
2479         int err = 0;
2480         struct in_device *in_dev;
2481         mm_segment_t fs;
2482         struct ifreq if_info;
2483         struct sockaddr_in *if_data1, *if_data2;
2484
2485         chdlc_priv_area = dev->priv;
2486         port_num = card->u.c.comm_port;
2487
2488         /* Bug Fix Mar 16 2000
2489          * AND the IP address to the Mask before checking
2490          * the last two bits. */
2491
2492         if((chdlc_priv_area->route_status == ADD_ROUTE) &&
2493                 ((chdlc_priv_area->IP_address & ~chdlc_priv_area->IP_netmask) > 2)) {
2494
2495                 printk(KERN_INFO "%s: Dynamic route failure.\n",card->devname);
2496
2497                 if(card->u.c.slarp_timer) {
2498                         u32 addr_net = htonl(chdlc_priv_area->IP_address);
2499
2500                         printk(KERN_INFO "%s: Bad IP address %u.%u.%u.%u received\n",
2501                                 card->devname,
2502                                NIPQUAD(addr_net));
2503                         printk(KERN_INFO "%s: from remote station.\n",
2504                                 card->devname);
2505
2506                 }else{
2507                         u32 addr_net = htonl(chdlc_priv_area->IP_address);
2508
2509                         printk(KERN_INFO "%s: Bad IP address %u.%u.%u.%u issued\n",
2510                                card->devname,
2511                                NIPQUAD(addr_net));
2512                         printk(KERN_INFO "%s: to remote station. Local\n",
2513                                 card->devname);
2514                         printk(KERN_INFO "%s: IP address must be A.B.C.1\n",
2515                                 card->devname);
2516                         printk(KERN_INFO "%s: or A.B.C.2.\n",card->devname);
2517                 }
2518
2519                 /* remove the route due to the IP address error condition */
2520                 chdlc_priv_area->route_status = REMOVE_ROUTE;
2521                 err = 1;
2522         }
2523
2524         /* If we are removing a route with bad IP addressing, then use the */
2525         /* locally configured IP addresses */
2526         if((chdlc_priv_area->route_status == REMOVE_ROUTE) && err) {
2527
2528                 /* do not remove a bad route that has already been removed */
2529                 if(chdlc_priv_area->route_removed) {
2530                         return;
2531                 }
2532
2533                 in_dev = dev->ip_ptr;
2534
2535                 if(in_dev != NULL) {
2536                         struct in_ifaddr *ifa = in_dev->ifa_list;
2537                         if (ifa != NULL ) {
2538                                 local_IP_addr = ifa->ifa_local;
2539                                 IP_netmask  = ifa->ifa_mask;
2540                         }
2541                 }
2542         }else{
2543                 /* According to Cisco HDLC, if the point-to-point address is
2544                    A.B.C.1, then we are the opposite (A.B.C.2), and vice-versa.
2545                 */
2546                 IP_netmask = ntohl(chdlc_priv_area->IP_netmask);
2547                 remote_IP_addr = ntohl(chdlc_priv_area->IP_address);
2548
2549
2550                 /* If Netmask is 255.255.255.255 the local address
2551                  * calculation will fail. Default it back to 255.255.255.0 */
2552                 if (IP_netmask == 0xffffffff)
2553                         IP_netmask &= 0x00ffffff;
2554
2555                 /* Bug Fix Mar 16 2000
2556                  * AND the Remote IP address with IP netmask, instead
2557                  * of static netmask of 255.255.255.0 */
2558                 local_IP_addr = (remote_IP_addr & IP_netmask) +
2559                         (~remote_IP_addr & ntohl(0x0003));
2560
2561                 if(!card->u.c.slarp_timer) {
2562                         IP_addr = local_IP_addr;
2563                         local_IP_addr = remote_IP_addr;
2564                         remote_IP_addr = IP_addr;
2565                 }
2566         }
2567
2568         fs = get_fs();                  /* Save file system  */
2569         set_fs(get_ds());               /* Get user space block */
2570
2571         /* Setup a structure for adding/removing routes */
2572         memset(&if_info, 0, sizeof(if_info));
2573         strcpy(if_info.ifr_name, dev->name);
2574
2575         switch (chdlc_priv_area->route_status) {
2576
2577         case ADD_ROUTE:
2578
2579                 if(!card->u.c.slarp_timer) {
2580                         if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
2581                         if_data2->sin_addr.s_addr = remote_IP_addr;
2582                         if_data2->sin_family = AF_INET;
2583                         err = devinet_ioctl(SIOCSIFDSTADDR, &if_info);
2584                 } else {
2585                         if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
2586                         if_data1->sin_addr.s_addr = local_IP_addr;
2587                         if_data1->sin_family = AF_INET;
2588                         if(!(err = devinet_ioctl(SIOCSIFADDR, &if_info))){
2589                                 if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
2590                                 if_data2->sin_addr.s_addr = remote_IP_addr;
2591                                 if_data2->sin_family = AF_INET;
2592                                 err = devinet_ioctl(SIOCSIFDSTADDR, &if_info);
2593                         }
2594                 }
2595
2596                if(err) {
2597                         printk(KERN_INFO "%s: Add route %u.%u.%u.%u failed (%d)\n",
2598                                 card->devname, NIPQUAD(remote_IP_addr), err);
2599                 } else {
2600                         ((chdlc_private_area_t *)dev->priv)->route_status = ROUTE_ADDED;
2601                         printk(KERN_INFO "%s: Dynamic route added.\n",
2602                                 card->devname);
2603                         printk(KERN_INFO "%s:    Local IP addr : %u.%u.%u.%u\n",
2604                                 card->devname, NIPQUAD(local_IP_addr));
2605                         printk(KERN_INFO "%s:    Remote IP addr: %u.%u.%u.%u\n",
2606                                 card->devname, NIPQUAD(remote_IP_addr));
2607                         chdlc_priv_area->route_removed = 0;
2608                 }
2609                 break;
2610
2611
2612         case REMOVE_ROUTE:
2613
2614                 /* Change the local ip address of the interface to 0.
2615                  * This will also delete the destination route.
2616                  */
2617                 if(!card->u.c.slarp_timer) {
2618                         if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
2619                         if_data2->sin_addr.s_addr = 0;
2620                         if_data2->sin_family = AF_INET;
2621                         err = devinet_ioctl(SIOCSIFDSTADDR, &if_info);
2622                 } else {
2623                         if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
2624                         if_data1->sin_addr.s_addr = 0;
2625                         if_data1->sin_family = AF_INET;
2626                         err = devinet_ioctl(SIOCSIFADDR,&if_info);
2627
2628                 }
2629                 if(err) {
2630                         printk(KERN_INFO
2631                                 "%s: Remove route %u.%u.%u.%u failed, (err %d)\n",
2632                                         card->devname, NIPQUAD(remote_IP_addr),
2633                                         err);
2634                 } else {
2635                         ((chdlc_private_area_t *)dev->priv)->route_status =
2636                                 NO_ROUTE;
2637                         printk(KERN_INFO "%s: Dynamic route removed: %u.%u.%u.%u\n",
2638                                         card->devname, NIPQUAD(local_IP_addr));
2639                         chdlc_priv_area->route_removed = 1;
2640                 }
2641                 break;
2642         }
2643
2644         set_fs(fs);                     /* Restore file system */
2645
2646 }
2647
2648
2649 /*=============================================================================
2650  * Store a UDP management packet for later processing.
2651  */
2652
2653 static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
2654                               struct sk_buff *skb, struct net_device* dev,
2655                               chdlc_private_area_t* chdlc_priv_area)
2656 {
2657         int udp_pkt_stored = 0;
2658
2659         if(!chdlc_priv_area->udp_pkt_lgth &&
2660           (skb->len <= MAX_LGTH_UDP_MGNT_PKT)) {
2661                 chdlc_priv_area->udp_pkt_lgth = skb->len;
2662                 chdlc_priv_area->udp_pkt_src = udp_pkt_src;
2663                 memcpy(chdlc_priv_area->udp_pkt_data, skb->data, skb->len);
2664                 chdlc_priv_area->timer_int_enabled = TMR_INT_ENABLED_UDP;
2665                 udp_pkt_stored = 1;
2666         }
2667
2668         if(udp_pkt_src == UDP_PKT_FRM_STACK){
2669                 dev_kfree_skb_any(skb);
2670         }else{
2671                 dev_kfree_skb_any(skb);
2672         }
2673
2674         return(udp_pkt_stored);
2675 }
2676
2677
2678 /*=============================================================================
2679  * Process UDP management packet.
2680  */
2681
2682 static int process_udp_mgmt_pkt(sdla_t* card, struct net_device* dev,
2683                                 chdlc_private_area_t* chdlc_priv_area )
2684 {
2685         unsigned char *buf;
2686         unsigned int frames, len;
2687         struct sk_buff *new_skb;
2688         unsigned short buffer_length, real_len;
2689         unsigned long data_ptr;
2690         unsigned data_length;
2691         int udp_mgmt_req_valid = 1;
2692         CHDLC_MAILBOX_STRUCT *mb = card->mbox;
2693         SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
2694         chdlc_udp_pkt_t *chdlc_udp_pkt;
2695         struct timeval tv;
2696         int err;
2697         char ut_char;
2698
2699         chdlc_udp_pkt = (chdlc_udp_pkt_t *) chdlc_priv_area->udp_pkt_data;
2700
2701         if(chdlc_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK){
2702
2703                 /* Only these commands are support for remote debugging.
2704                  * All others are not */
2705                 switch(chdlc_udp_pkt->cblock.command) {
2706
2707                         case READ_GLOBAL_STATISTICS:
2708                         case READ_MODEM_STATUS:
2709                         case READ_CHDLC_LINK_STATUS:
2710                         case CPIPE_ROUTER_UP_TIME:
2711                         case READ_COMMS_ERROR_STATS:
2712                         case READ_CHDLC_OPERATIONAL_STATS:
2713
2714                         /* These two commands are executed for
2715                          * each request */
2716                         case READ_CHDLC_CONFIGURATION:
2717                         case READ_CHDLC_CODE_VERSION:
2718                                 udp_mgmt_req_valid = 1;
2719                                 break;
2720                         default:
2721                                 udp_mgmt_req_valid = 0;
2722                                 break;
2723                 }
2724         }
2725
2726         if(!udp_mgmt_req_valid) {
2727
2728                 /* set length to 0 */
2729                 chdlc_udp_pkt->cblock.buffer_length = 0;
2730
2731                 /* set return code */
2732                 chdlc_udp_pkt->cblock.return_code = 0xCD;
2733
2734                 if (net_ratelimit()){
2735                         printk(KERN_INFO
2736                         "%s: Warning, Illegal UDP command attempted from network: %x\n",
2737                         card->devname,chdlc_udp_pkt->cblock.command);
2738                 }
2739
2740         } else {
2741                 unsigned long trace_status_cfg_addr = 0;
2742                 TRACE_STATUS_EL_CFG_STRUCT trace_cfg_struct;
2743                 TRACE_STATUS_ELEMENT_STRUCT trace_element_struct;
2744
2745                 switch(chdlc_udp_pkt->cblock.command) {
2746
2747                 case CPIPE_ENABLE_TRACING:
2748                      if (!chdlc_priv_area->TracingEnabled) {
2749
2750                         /* OPERATE_DATALINE_MONITOR */
2751
2752                         mb->buffer_length = sizeof(LINE_TRACE_CONFIG_STRUCT);
2753                         mb->command = SET_TRACE_CONFIGURATION;
2754
2755                         ((LINE_TRACE_CONFIG_STRUCT *)mb->data)->
2756                                 trace_config = TRACE_ACTIVE;
2757                         /* Trace delay mode is not used because it slows
2758                            down transfer and results in a standoff situation
2759                            when there is a lot of data */
2760
2761                         /* Configure the Trace based on user inputs */
2762                         ((LINE_TRACE_CONFIG_STRUCT *)mb->data)->trace_config |=
2763                                         chdlc_udp_pkt->data[0];
2764
2765                         ((LINE_TRACE_CONFIG_STRUCT *)mb->data)->
2766                            trace_deactivation_timer = 4000;
2767
2768
2769                         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
2770                         if (err != COMMAND_OK) {
2771                                 chdlc_error(card,err,mb);
2772                                 card->TracingEnabled = 0;
2773                                 chdlc_udp_pkt->cblock.return_code = err;
2774                                 mb->buffer_length = 0;
2775                                 break;
2776                         }
2777
2778                         /* Get the base address of the trace element list */
2779                         mb->buffer_length = 0;
2780                         mb->command = READ_TRACE_CONFIGURATION;
2781                         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
2782
2783                         if (err != COMMAND_OK) {
2784                                 chdlc_error(card,err,mb);
2785                                 chdlc_priv_area->TracingEnabled = 0;
2786                                 chdlc_udp_pkt->cblock.return_code = err;
2787                                 mb->buffer_length = 0;
2788                                 break;
2789                         }
2790
2791                         trace_status_cfg_addr =((LINE_TRACE_CONFIG_STRUCT *)
2792                                 mb->data) -> ptr_trace_stat_el_cfg_struct;
2793
2794                         sdla_peek(&card->hw, trace_status_cfg_addr,
2795                                  &trace_cfg_struct, sizeof(trace_cfg_struct));
2796
2797                         chdlc_priv_area->start_trace_addr = trace_cfg_struct.
2798                                 base_addr_trace_status_elements;
2799
2800                         chdlc_priv_area->number_trace_elements =
2801                                         trace_cfg_struct.number_trace_status_elements;
2802
2803                         chdlc_priv_area->end_trace_addr = (unsigned long)
2804                                         ((TRACE_STATUS_ELEMENT_STRUCT *)
2805                                          chdlc_priv_area->start_trace_addr +
2806                                          (chdlc_priv_area->number_trace_elements - 1));
2807
2808                         chdlc_priv_area->base_addr_trace_buffer =
2809                                         trace_cfg_struct.base_addr_trace_buffer;
2810
2811                         chdlc_priv_area->end_addr_trace_buffer =
2812                                         trace_cfg_struct.end_addr_trace_buffer;
2813
2814                         chdlc_priv_area->curr_trace_addr =
2815                                         trace_cfg_struct.next_trace_element_to_use;
2816
2817                         chdlc_priv_area->available_buffer_space = 2000 -
2818                                                                   sizeof(ip_pkt_t) -
2819                                                                   sizeof(udp_pkt_t) -
2820                                                                   sizeof(wp_mgmt_t) -
2821                                                                   sizeof(cblock_t) -
2822                                                                   sizeof(trace_info_t);
2823                      }
2824                      chdlc_udp_pkt->cblock.return_code = COMMAND_OK;
2825                      mb->buffer_length = 0;
2826                      chdlc_priv_area->TracingEnabled = 1;
2827                      break;
2828
2829
2830                 case CPIPE_DISABLE_TRACING:
2831                      if (chdlc_priv_area->TracingEnabled) {
2832
2833                         /* OPERATE_DATALINE_MONITOR */
2834                         mb->buffer_length = sizeof(LINE_TRACE_CONFIG_STRUCT);
2835                         mb->command = SET_TRACE_CONFIGURATION;
2836                         ((LINE_TRACE_CONFIG_STRUCT *)mb->data)->
2837                                 trace_config = TRACE_INACTIVE;
2838                         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
2839                      }
2840
2841                      chdlc_priv_area->TracingEnabled = 0;
2842                      chdlc_udp_pkt->cblock.return_code = COMMAND_OK;
2843                      mb->buffer_length = 0;
2844                      break;
2845
2846
2847                 case CPIPE_GET_TRACE_INFO:
2848
2849                      if (!chdlc_priv_area->TracingEnabled) {
2850                         chdlc_udp_pkt->cblock.return_code = 1;
2851                         mb->buffer_length = 0;
2852                         break;
2853                      }
2854
2855                      chdlc_udp_pkt->trace_info.ismoredata = 0x00;
2856                      buffer_length = 0; /* offset of packet already occupied */
2857
2858                      for (frames=0; frames < chdlc_priv_area->number_trace_elements; frames++){
2859
2860                         trace_pkt_t *trace_pkt = (trace_pkt_t *)
2861                                 &chdlc_udp_pkt->data[buffer_length];
2862
2863                         sdla_peek(&card->hw, chdlc_priv_area->curr_trace_addr,
2864                                   (unsigned char *)&trace_element_struct,
2865                                   sizeof(TRACE_STATUS_ELEMENT_STRUCT));
2866
2867                         if (trace_element_struct.opp_flag == 0x00) {
2868                                 break;
2869                         }
2870
2871                         /* get pointer to real data */
2872                         data_ptr = trace_element_struct.ptr_data_bfr;
2873
2874                         /* See if there is actual data on the trace buffer */
2875                         if (data_ptr){
2876                                 data_length = trace_element_struct.trace_length;
2877                         }else{
2878                                 data_length = 0;
2879                                 chdlc_udp_pkt->trace_info.ismoredata = 0x01;
2880                         }
2881
2882                         if( (chdlc_priv_area->available_buffer_space - buffer_length)
2883                                 < ( sizeof(trace_pkt_t) + data_length) ) {
2884
2885                             /* indicate there are more frames on board & exit */
2886                                 chdlc_udp_pkt->trace_info.ismoredata = 0x01;
2887                                 break;
2888                          }
2889
2890                         trace_pkt->status = trace_element_struct.trace_type;
2891
2892                         trace_pkt->time_stamp =
2893                                 trace_element_struct.trace_time_stamp;
2894
2895                         trace_pkt->real_length =
2896                                 trace_element_struct.trace_length;
2897
2898                         /* see if we can fit the frame into the user buffer */
2899                         real_len = trace_pkt->real_length;
2900
2901                         if (data_ptr == 0) {
2902                                 trace_pkt->data_avail = 0x00;
2903                         } else {
2904                                 unsigned tmp = 0;
2905
2906                                 /* get the data from circular buffer
2907                                     must check for end of buffer */
2908                                 trace_pkt->data_avail = 0x01;
2909
2910                                 if ((data_ptr + real_len) >
2911                                              chdlc_priv_area->end_addr_trace_buffer + 1){
2912
2913                                         tmp = chdlc_priv_area->end_addr_trace_buffer - data_ptr + 1;
2914                                         sdla_peek(&card->hw, data_ptr,
2915                                                   trace_pkt->data,tmp);
2916                                         data_ptr = chdlc_priv_area->base_addr_trace_buffer;
2917                                 }
2918
2919                                 sdla_peek(&card->hw, data_ptr,
2920                                           &trace_pkt->data[tmp], real_len - tmp);
2921                         }
2922
2923                         /* zero the opp flag to show we got the frame */
2924                         ut_char = 0x00;
2925                         sdla_poke(&card->hw, chdlc_priv_area->curr_trace_addr, &ut_char, 1);
2926
2927                         /* now move onto the next frame */
2928                         chdlc_priv_area->curr_trace_addr += sizeof(TRACE_STATUS_ELEMENT_STRUCT);
2929
2930                         /* check if we went over the last address */
2931                         if ( chdlc_priv_area->curr_trace_addr > chdlc_priv_area->end_trace_addr ) {
2932                                 chdlc_priv_area->curr_trace_addr = chdlc_priv_area->start_trace_addr;
2933                         }
2934
2935                         if(trace_pkt->data_avail == 0x01) {
2936                                 buffer_length += real_len - 1;
2937                         }
2938
2939                         /* for the header */
2940                         buffer_length += sizeof(trace_pkt_t);
2941
2942                      }  /* For Loop */
2943
2944                      if (frames == chdlc_priv_area->number_trace_elements){
2945                         chdlc_udp_pkt->trace_info.ismoredata = 0x01;
2946                      }
2947                      chdlc_udp_pkt->trace_info.num_frames = frames;
2948
2949                      mb->buffer_length = buffer_length;
2950                      chdlc_udp_pkt->cblock.buffer_length = buffer_length;
2951
2952                      chdlc_udp_pkt->cblock.return_code = COMMAND_OK;
2953
2954                      break;
2955
2956
2957                 case CPIPE_FT1_READ_STATUS:
2958                         ((unsigned char *)chdlc_udp_pkt->data )[0] =
2959                                 flags->FT1_info_struct.parallel_port_A_input;
2960
2961                         ((unsigned char *)chdlc_udp_pkt->data )[1] =
2962                                 flags->FT1_info_struct.parallel_port_B_input;
2963
2964                         chdlc_udp_pkt->cblock.return_code = COMMAND_OK;
2965                         chdlc_udp_pkt->cblock.buffer_length = 2;
2966                         mb->buffer_length = 2;
2967                         break;
2968
2969                 case CPIPE_ROUTER_UP_TIME:
2970                         do_gettimeofday( &tv );
2971                         chdlc_priv_area->router_up_time = tv.tv_sec -
2972                                         chdlc_priv_area->router_start_time;
2973                         *(unsigned long *)&chdlc_udp_pkt->data =
2974                                         chdlc_priv_area->router_up_time;
2975                         mb->buffer_length = sizeof(unsigned long);
2976                         chdlc_udp_pkt->cblock.buffer_length = sizeof(unsigned long);
2977                         chdlc_udp_pkt->cblock.return_code = COMMAND_OK;
2978                         break;
2979
2980                 case FT1_MONITOR_STATUS_CTRL:
2981                         /* Enable FT1 MONITOR STATUS */
2982                         if ((chdlc_udp_pkt->data[0] & ENABLE_READ_FT1_STATUS) ||
2983                                 (chdlc_udp_pkt->data[0] & ENABLE_READ_FT1_OP_STATS)) {
2984
2985                                 if( rCount++ != 0 ) {
2986                                         chdlc_udp_pkt->cblock.
2987                                         return_code = COMMAND_OK;
2988                                         mb->buffer_length = 1;
2989                                         break;
2990                                 }
2991                         }
2992
2993                         /* Disable FT1 MONITOR STATUS */
2994                         if( chdlc_udp_pkt->data[0] == 0) {
2995
2996                                 if( --rCount != 0) {
2997                                         chdlc_udp_pkt->cblock.
2998                                         return_code = COMMAND_OK;
2999                                         mb->buffer_length = 1;
3000                                         break;
3001                                 }
3002                         }
3003                         goto dflt_1;
3004
3005                 default:
3006 dflt_1:
3007                         /* it's a board command */
3008                         mb->command = chdlc_udp_pkt->cblock.command;
3009                         mb->buffer_length = chdlc_udp_pkt->cblock.buffer_length;
3010                         if (mb->buffer_length) {
3011                                 memcpy(&mb->data, (unsigned char *) chdlc_udp_pkt->
3012                                                         data, mb->buffer_length);
3013                         }
3014                         /* run the command on the board */
3015                         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
3016                         if (err != COMMAND_OK) {
3017                                 break;
3018                         }
3019
3020                         /* copy the result back to our buffer */
3021                         memcpy(&chdlc_udp_pkt->cblock, mb, sizeof(cblock_t));
3022
3023                         if (mb->buffer_length) {
3024                                 memcpy(&chdlc_udp_pkt->data, &mb->data,
3025                                                                 mb->buffer_length);
3026                         }
3027
3028                 } /* end of switch */
3029         } /* end of else */
3030
3031         /* Fill UDP TTL */
3032         chdlc_udp_pkt->ip_pkt.ttl = card->wandev.ttl;
3033
3034         len = reply_udp(chdlc_priv_area->udp_pkt_data, mb->buffer_length);
3035
3036
3037         if(chdlc_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK){
3038
3039                 /* Must check if we interrupted if_send() routine. The
3040                  * tx buffers might be used. If so drop the packet */
3041                 if (!test_bit(SEND_CRIT,&card->wandev.critical)) {
3042
3043                         if(!chdlc_send(card, chdlc_priv_area->udp_pkt_data, len)) {
3044                                 ++ card->wandev.stats.tx_packets;
3045                                 card->wandev.stats.tx_bytes += len;
3046                         }
3047                 }
3048         } else {
3049
3050                 /* Pass it up the stack
3051                    Allocate socket buffer */
3052                 if ((new_skb = dev_alloc_skb(len)) != NULL) {
3053                         /* copy data into new_skb */
3054
3055                         buf = skb_put(new_skb, len);
3056                         memcpy(buf, chdlc_priv_area->udp_pkt_data, len);
3057
3058                         /* Decapsulate pkt and pass it up the protocol stack */
3059                         new_skb->protocol = htons(ETH_P_IP);
3060                         new_skb->dev = dev;
3061                         new_skb->mac.raw  = new_skb->data;
3062
3063                         netif_rx(new_skb);
3064                         dev->last_rx = jiffies;
3065                 } else {
3066
3067                         printk(KERN_INFO "%s: no socket buffers available!\n",
3068                                         card->devname);
3069                 }
3070         }
3071
3072         chdlc_priv_area->udp_pkt_lgth = 0;
3073
3074         return 0;
3075 }
3076
3077 /*============================================================================
3078  * Initialize Receive and Transmit Buffers.
3079  */
3080
3081 static void init_chdlc_tx_rx_buff( sdla_t* card)
3082 {
3083         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
3084         CHDLC_TX_STATUS_EL_CFG_STRUCT *tx_config;
3085         CHDLC_RX_STATUS_EL_CFG_STRUCT *rx_config;
3086         char err;
3087
3088         mb->buffer_length = 0;
3089         mb->command = READ_CHDLC_CONFIGURATION;
3090         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
3091
3092         if(err != COMMAND_OK) {
3093                 if (card->wandev.dev){
3094                         chdlc_error(card,err,mb);
3095                 }
3096                 return;
3097         }
3098
3099         if(card->hw.type == SDLA_S514) {
3100                 tx_config = (CHDLC_TX_STATUS_EL_CFG_STRUCT *)(card->hw.dpmbase +
3101                 (((CHDLC_CONFIGURATION_STRUCT *)mb->data)->
3102                             ptr_CHDLC_Tx_stat_el_cfg_struct));
3103                 rx_config = (CHDLC_RX_STATUS_EL_CFG_STRUCT *)(card->hw.dpmbase +
3104                 (((CHDLC_CONFIGURATION_STRUCT *)mb->data)->
3105                             ptr_CHDLC_Rx_stat_el_cfg_struct));
3106
3107                 /* Setup Head and Tails for buffers */
3108                 card->u.c.txbuf_base = (void *)(card->hw.dpmbase +
3109                 tx_config->base_addr_Tx_status_elements);
3110                 card->u.c.txbuf_last =
3111                 (CHDLC_DATA_TX_STATUS_EL_STRUCT *)
3112                 card->u.c.txbuf_base +
3113                 (tx_config->number_Tx_status_elements - 1);
3114
3115                 card->u.c.rxbuf_base = (void *)(card->hw.dpmbase +
3116                 rx_config->base_addr_Rx_status_elements);
3117                 card->u.c.rxbuf_last =
3118                 (CHDLC_DATA_RX_STATUS_EL_STRUCT *)
3119                 card->u.c.rxbuf_base +
3120                 (rx_config->number_Rx_status_elements - 1);
3121
3122                 /* Set up next pointer to be used */
3123                 card->u.c.txbuf = (void *)(card->hw.dpmbase +
3124                 tx_config->next_Tx_status_element_to_use);
3125                 card->u.c.rxmb = (void *)(card->hw.dpmbase +
3126                 rx_config->next_Rx_status_element_to_use);
3127         }
3128         else {
3129                 tx_config = (CHDLC_TX_STATUS_EL_CFG_STRUCT *)(card->hw.dpmbase +
3130                         (((CHDLC_CONFIGURATION_STRUCT *)mb->data)->
3131                         ptr_CHDLC_Tx_stat_el_cfg_struct % SDLA_WINDOWSIZE));
3132
3133                 rx_config = (CHDLC_RX_STATUS_EL_CFG_STRUCT *)(card->hw.dpmbase +
3134                         (((CHDLC_CONFIGURATION_STRUCT *)mb->data)->
3135                         ptr_CHDLC_Rx_stat_el_cfg_struct % SDLA_WINDOWSIZE));
3136
3137                 /* Setup Head and Tails for buffers */
3138                 card->u.c.txbuf_base = (void *)(card->hw.dpmbase +
3139                 (tx_config->base_addr_Tx_status_elements % SDLA_WINDOWSIZE));
3140                 card->u.c.txbuf_last =
3141                 (CHDLC_DATA_TX_STATUS_EL_STRUCT *)card->u.c.txbuf_base
3142                 + (tx_config->number_Tx_status_elements - 1);
3143                 card->u.c.rxbuf_base = (void *)(card->hw.dpmbase +
3144                 (rx_config->base_addr_Rx_status_elements % SDLA_WINDOWSIZE));
3145                 card->u.c.rxbuf_last =
3146                 (CHDLC_DATA_RX_STATUS_EL_STRUCT *)card->u.c.rxbuf_base
3147                 + (rx_config->number_Rx_status_elements - 1);
3148
3149                  /* Set up next pointer to be used */
3150                 card->u.c.txbuf = (void *)(card->hw.dpmbase +
3151                 (tx_config->next_Tx_status_element_to_use % SDLA_WINDOWSIZE));
3152                 card->u.c.rxmb = (void *)(card->hw.dpmbase +
3153                 (rx_config->next_Rx_status_element_to_use % SDLA_WINDOWSIZE));
3154         }
3155
3156         /* Setup Actual Buffer Start and end addresses */
3157         card->u.c.rx_base = rx_config->base_addr_Rx_buffer;
3158         card->u.c.rx_top  = rx_config->end_addr_Rx_buffer;
3159
3160 }
3161
3162 /*=============================================================================
3163  * Perform Interrupt Test by running READ_CHDLC_CODE_VERSION command MAX_INTR
3164  * _TEST_COUNTER times.
3165  */
3166 static int intr_test( sdla_t* card)
3167 {
3168         CHDLC_MAILBOX_STRUCT* mb = card->mbox;
3169         int err,i;
3170
3171         Intr_test_counter = 0;
3172
3173         err = chdlc_set_intr_mode(card, APP_INT_ON_COMMAND_COMPLETE);
3174
3175         if (err == CMD_OK) {
3176                 for (i = 0; i < MAX_INTR_TEST_COUNTER; i ++) {
3177                         mb->buffer_length  = 0;
3178                         mb->command = READ_CHDLC_CODE_VERSION;
3179                         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
3180                         if (err != CMD_OK)
3181                                 chdlc_error(card, err, mb);
3182                 }
3183         }
3184         else {
3185                 return err;
3186         }
3187
3188         err = chdlc_set_intr_mode(card, 0);
3189
3190         if (err != CMD_OK)
3191                 return err;
3192
3193         return 0;
3194 }
3195
3196 /*==============================================================================
3197  * Determine what type of UDP call it is. CPIPEAB ?
3198  */
3199 static int udp_pkt_type(struct sk_buff *skb, sdla_t* card)
3200 {
3201          chdlc_udp_pkt_t *chdlc_udp_pkt = (chdlc_udp_pkt_t *)skb->data;
3202
3203 #ifdef _WAN_UDP_DEBUG
3204                 printk(KERN_INFO "SIG %s = %s\n\
3205                                   UPP %x = %x\n\
3206                                   PRT %x = %x\n\
3207                                   REQ %i = %i\n\
3208                                   36 th = %x 37th = %x\n",
3209                                   chdlc_udp_pkt->wp_mgmt.signature,
3210                                   UDPMGMT_SIGNATURE,
3211                                   chdlc_udp_pkt->udp_pkt.udp_dst_port,
3212                                   ntohs(card->wandev.udp_port),
3213                                   chdlc_udp_pkt->ip_pkt.protocol,
3214                                   UDPMGMT_UDP_PROTOCOL,
3215                                   chdlc_udp_pkt->wp_mgmt.request_reply,
3216                                   UDPMGMT_REQUEST,
3217                                   skb->data[36], skb->data[37]);
3218 #endif
3219
3220         if (!strncmp(chdlc_udp_pkt->wp_mgmt.signature,UDPMGMT_SIGNATURE,8) &&
3221            (chdlc_udp_pkt->udp_pkt.udp_dst_port == ntohs(card->wandev.udp_port)) &&
3222            (chdlc_udp_pkt->ip_pkt.protocol == UDPMGMT_UDP_PROTOCOL) &&
3223            (chdlc_udp_pkt->wp_mgmt.request_reply == UDPMGMT_REQUEST)) {
3224
3225                 return UDP_CPIPE_TYPE;
3226
3227         }else{
3228                 return UDP_INVALID_TYPE;
3229         }
3230 }
3231
3232 /*============================================================================
3233  * Set PORT state.
3234  */
3235 static void port_set_state (sdla_t *card, int state)
3236 {
3237         if (card->u.c.state != state)
3238         {
3239                 switch (state)
3240                 {
3241                 case WAN_CONNECTED:
3242                         printk (KERN_INFO "%s: Link connected!\n",
3243                                 card->devname);
3244                         break;
3245
3246                 case WAN_CONNECTING:
3247                         printk (KERN_INFO "%s: Link connecting...\n",
3248                                 card->devname);
3249                         break;
3250
3251                 case WAN_DISCONNECTED:
3252                         printk (KERN_INFO "%s: Link disconnected!\n",
3253                                 card->devname);
3254                         break;
3255                 }
3256
3257                 card->wandev.state = card->u.c.state = state;
3258                 if (card->wandev.dev){
3259                         struct net_device *dev = card->wandev.dev;
3260                         chdlc_private_area_t *chdlc_priv_area = dev->priv;
3261                         chdlc_priv_area->common.state = state;
3262                 }
3263         }
3264 }
3265
3266 /*===========================================================================
3267  * config_chdlc
3268  *
3269  *      Configure the chdlc protocol and enable communications.
3270  *
3271  *      The if_open() function binds this function to the poll routine.
3272  *      Therefore, this function will run every time the chdlc interface
3273  *      is brought up. We cannot run this function from the if_open
3274  *      because if_open does not have access to the remote IP address.
3275  *
3276  *      If the communications are not enabled, proceed to configure
3277  *      the card and enable communications.
3278  *
3279  *      If the communications are enabled, it means that the interface
3280  *      was shutdown by ether the user or driver. In this case, we
3281  *      have to check that the IP addresses have not changed.  If
3282  *      the IP addresses have changed, we have to reconfigure the firmware
3283  *      and update the changed IP addresses.  Otherwise, just exit.
3284  *
3285  */
3286
3287 static int config_chdlc (sdla_t *card)
3288 {
3289         struct net_device *dev = card->wandev.dev;
3290         chdlc_private_area_t *chdlc_priv_area = dev->priv;
3291         SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
3292
3293         if (card->u.c.comm_enabled){
3294
3295                 /* Jun 20. 2000: NC
3296                  * IP addresses are not used in the API mode */
3297
3298                 if ((chdlc_priv_area->ip_local_tmp != chdlc_priv_area->ip_local ||
3299                      chdlc_priv_area->ip_remote_tmp != chdlc_priv_area->ip_remote) &&
3300                      card->u.c.usedby == WANPIPE) {
3301
3302                         /* The IP addersses have changed, we must
3303                          * stop the communications and reconfigure
3304                          * the card. Reason: the firmware must know
3305                          * the local and remote IP addresses. */
3306                         disable_comm(card);
3307                         port_set_state(card, WAN_DISCONNECTED);
3308                         printk(KERN_INFO
3309                                 "%s: IP addresses changed!\n",
3310                                         card->devname);
3311                         printk(KERN_INFO
3312                                 "%s: Restarting communications ...\n",
3313                                         card->devname);
3314                 }else{
3315                         /* IP addresses are the same and the link is up,
3316                          * we don't have to do anything here. Therefore, exit */
3317                         return 0;
3318                 }
3319         }
3320
3321         chdlc_priv_area->ip_local = chdlc_priv_area->ip_local_tmp;
3322         chdlc_priv_area->ip_remote = chdlc_priv_area->ip_remote_tmp;
3323
3324
3325         /* Setup the Board for asynchronous mode */
3326         if (card->u.c.async_mode){
3327
3328                 if (set_asy_config(card)) {
3329                         printk (KERN_INFO "%s: Failed CHDLC Async configuration!\n",
3330                                 card->devname);
3331                         return 0;
3332                 }
3333         }else{
3334                 /* Setup the Board for CHDLC */
3335                 if (set_chdlc_config(card)) {
3336                         printk (KERN_INFO "%s: Failed CHDLC configuration!\n",
3337                                 card->devname);
3338                         return 0;
3339                 }
3340         }
3341
3342         /* Set interrupt mode and mask */
3343         if (chdlc_set_intr_mode(card, APP_INT_ON_RX_FRAME |
3344                                 APP_INT_ON_GLOBAL_EXCEP_COND |
3345                                 APP_INT_ON_TX_FRAME |
3346                                 APP_INT_ON_CHDLC_EXCEP_COND | APP_INT_ON_TIMER)){
3347                 printk (KERN_INFO "%s: Failed to set interrupt triggers!\n",
3348                                 card->devname);
3349                 return 0;
3350         }
3351
3352
3353         /* Mask the Transmit and Timer interrupt */
3354         flags->interrupt_info_struct.interrupt_permission &=
3355                 ~(APP_INT_ON_TX_FRAME | APP_INT_ON_TIMER);
3356
3357         /* In TTY mode, receive interrupt will be enabled during
3358          * wanpipe_tty_open() operation */
3359         if (card->tty_opt){
3360                 flags->interrupt_info_struct.interrupt_permission &= ~APP_INT_ON_RX_FRAME;
3361         }
3362
3363         /* Enable communications */
3364         if (card->u.c.async_mode){
3365                 if (asy_comm_enable(card) != 0) {
3366                         printk(KERN_INFO "%s: Failed to enable async commnunication!\n",
3367                                         card->devname);
3368                         flags->interrupt_info_struct.interrupt_permission = 0;
3369                         card->u.c.comm_enabled=0;
3370                         chdlc_set_intr_mode(card,0);
3371                         return 0;
3372                 }
3373         }else{
3374                 if (chdlc_comm_enable(card) != 0) {
3375                         printk(KERN_INFO "%s: Failed to enable chdlc communications!\n",
3376                                         card->devname);
3377                         flags->interrupt_info_struct.interrupt_permission = 0;
3378                         card->u.c.comm_enabled=0;
3379                         chdlc_set_intr_mode(card,0);
3380                         return 0;
3381                 }
3382         }
3383
3384         /* Initialize Rx/Tx buffer control fields */
3385         init_chdlc_tx_rx_buff(card);
3386         port_set_state(card, WAN_CONNECTING);
3387         return 0;
3388 }
3389
3390
3391 /*============================================================
3392  * chdlc_poll
3393  *
3394  * Rationale:
3395  *      We cannot manipulate the routing tables, or
3396  *      ip addresses withing the interrupt. Therefore
3397  *      we must perform such actons outside an interrupt
3398  *      at a later time.
3399  *
3400  * Description:
3401  *      CHDLC polling routine, responsible for
3402  *      shutting down interfaces upon disconnect
3403  *      and adding/removing routes.
3404  *
3405  * Usage:
3406  *      This function is executed for each CHDLC
3407  *      interface through a tq_schedule bottom half.
3408  *
3409  *      trigger_chdlc_poll() function is used to kick
3410  *      the chldc_poll routine.
3411  */
3412
3413 static void chdlc_poll(struct net_device *dev)
3414 {
3415         chdlc_private_area_t *chdlc_priv_area;
3416         sdla_t *card;
3417         u8 check_gateway=0;
3418         SHARED_MEMORY_INFO_STRUCT* flags;
3419
3420
3421         if (!dev || (chdlc_priv_area=dev->priv) == NULL)
3422                 return;
3423
3424         card = chdlc_priv_area->card;
3425         flags = card->u.c.flags;
3426
3427         /* (Re)Configuraiton is in progress, stop what you are
3428          * doing and get out */
3429         if (test_bit(PERI_CRIT,&card->wandev.critical)){
3430                 clear_bit(POLL_CRIT,&card->wandev.critical);
3431                 return;
3432         }
3433
3434         /* if_open() function has triggered the polling routine
3435          * to determine the configured IP addresses.  Once the
3436          * addresses are found, trigger the chdlc configuration */
3437         if (test_bit(0,&chdlc_priv_area->config_chdlc)){
3438
3439                 chdlc_priv_area->ip_local_tmp  = get_ip_address(dev,WAN_LOCAL_IP);
3440                 chdlc_priv_area->ip_remote_tmp = get_ip_address(dev,WAN_POINTOPOINT_IP);
3441
3442                /* Jun 20. 2000 Bug Fix
3443                 * Only perform this check in WANPIPE mode, since
3444                 * IP addresses are not used in the API mode. */
3445
3446                 if (chdlc_priv_area->ip_local_tmp == chdlc_priv_area->ip_remote_tmp &&
3447                     card->u.c.slarp_timer == 0x00 &&
3448                     !card->u.c.backup &&
3449                     card->u.c.usedby == WANPIPE){
3450
3451                         if (++chdlc_priv_area->ip_error > MAX_IP_ERRORS){
3452                                 printk(KERN_INFO "\n%s: --- WARNING ---\n",
3453                                                 card->devname);
3454                                 printk(KERN_INFO
3455                                 "%s: The local IP address is the same as the\n",
3456                                                 card->devname);
3457                                 printk(KERN_INFO
3458                                 "%s: Point-to-Point IP address.\n",
3459                                                 card->devname);
3460                                 printk(KERN_INFO "%s: --- WARNING ---\n\n",
3461                                                 card->devname);
3462                         }else{
3463                                 clear_bit(POLL_CRIT,&card->wandev.critical);
3464                                 chdlc_priv_area->poll_delay_timer.expires = jiffies+HZ;
3465                                 add_timer(&chdlc_priv_area->poll_delay_timer);
3466                                 return;
3467                         }
3468                 }
3469
3470                 clear_bit(0,&chdlc_priv_area->config_chdlc);
3471                 clear_bit(POLL_CRIT,&card->wandev.critical);
3472
3473                 chdlc_priv_area->timer_int_enabled |= TMR_INT_ENABLED_CONFIG;
3474                 flags->interrupt_info_struct.interrupt_permission |= APP_INT_ON_TIMER;
3475                 return;
3476         }
3477         /* Dynamic interface implementation, as well as dynamic
3478          * routing.  */
3479
3480         switch (card->u.c.state){
3481
3482         case WAN_DISCONNECTED:
3483
3484                 /* If the dynamic interface configuration is on, and interface
3485                  * is up, then bring down the netowrk interface */
3486
3487                 if (test_bit(DYN_OPT_ON,&chdlc_priv_area->interface_down) &&
3488                     !test_bit(DEV_DOWN,  &chdlc_priv_area->interface_down) &&
3489                     card->wandev.dev->flags & IFF_UP){
3490
3491                         printk(KERN_INFO "%s: Interface %s down.\n",
3492                                 card->devname,card->wandev.dev->name);
3493                         change_dev_flags(card->wandev.dev,(card->wandev.dev->flags&~IFF_UP));
3494                         set_bit(DEV_DOWN,&chdlc_priv_area->interface_down);
3495                         chdlc_priv_area->route_status = NO_ROUTE;
3496
3497                 }else{
3498                         /* We need to check if the local IP address is
3499                          * zero. If it is, we shouldn't try to remove it.
3500                          */
3501
3502                         if (card->wandev.dev->flags & IFF_UP &&
3503                             get_ip_address(card->wandev.dev,WAN_LOCAL_IP) &&
3504                             chdlc_priv_area->route_status != NO_ROUTE &&
3505                             card->u.c.slarp_timer){
3506
3507                                 process_route(card);
3508                         }
3509                 }
3510                 break;
3511
3512         case WAN_CONNECTED:
3513
3514                 /* In SMP machine this code can execute before the interface
3515                  * comes up.  In this case, we must make sure that we do not
3516                  * try to bring up the interface before dev_open() is finished */
3517
3518
3519                 /* DEV_DOWN will be set only when we bring down the interface
3520                  * for the very first time. This way we know that it was us
3521                  * that brought the interface down */
3522
3523                 if (test_bit(DYN_OPT_ON,&chdlc_priv_area->interface_down) &&
3524                     test_bit(DEV_DOWN,  &chdlc_priv_area->interface_down) &&
3525                     !(card->wandev.dev->flags & IFF_UP)){
3526
3527                         printk(KERN_INFO "%s: Interface %s up.\n",
3528                                 card->devname,card->wandev.dev->name);
3529                         change_dev_flags(card->wandev.dev,(card->wandev.dev->flags|IFF_UP));
3530                         clear_bit(DEV_DOWN,&chdlc_priv_area->interface_down);
3531                         check_gateway=1;
3532                 }
3533
3534                 if (chdlc_priv_area->route_status == ADD_ROUTE &&
3535                     card->u.c.slarp_timer){
3536
3537                         process_route(card);
3538                         check_gateway=1;
3539                 }
3540
3541                 if (chdlc_priv_area->gateway && check_gateway)
3542                         add_gateway(card,dev);
3543
3544                 break;
3545         }
3546
3547         clear_bit(POLL_CRIT,&card->wandev.critical);
3548 }
3549
3550 /*============================================================
3551  * trigger_chdlc_poll
3552  *
3553  * Description:
3554  *      Add a chdlc_poll() work entry into the keventd work queue
3555  *      for a specific dlci/interface.  This will kick
3556  *      the fr_poll() routine at a later time.
3557  *
3558  * Usage:
3559  *      Interrupts use this to defer a taks to
3560  *      a polling routine.
3561  *
3562  */
3563 static void trigger_chdlc_poll(struct net_device *dev)
3564 {
3565         chdlc_private_area_t *chdlc_priv_area;
3566         sdla_t *card;
3567
3568         if (!dev)
3569                 return;
3570
3571         if ((chdlc_priv_area = dev->priv)==NULL)
3572                 return;
3573
3574         card = chdlc_priv_area->card;
3575
3576         if (test_and_set_bit(POLL_CRIT,&card->wandev.critical)){
3577                 return;
3578         }
3579         if (test_bit(PERI_CRIT,&card->wandev.critical)){
3580                 return;
3581         }
3582         schedule_work(&chdlc_priv_area->poll_work);
3583 }
3584
3585
3586 static void chdlc_poll_delay (unsigned long dev_ptr)
3587 {
3588         struct net_device *dev = (struct net_device *)dev_ptr;
3589         trigger_chdlc_poll(dev);
3590 }
3591
3592
3593 void s508_lock (sdla_t *card, unsigned long *smp_flags)
3594 {
3595         spin_lock_irqsave(&card->wandev.lock, *smp_flags);
3596         if (card->next){
3597                 spin_lock(&card->next->wandev.lock);
3598         }
3599 }
3600
3601 void s508_unlock (sdla_t *card, unsigned long *smp_flags)
3602 {
3603         if (card->next){
3604                 spin_unlock(&card->next->wandev.lock);
3605         }
3606         spin_unlock_irqrestore(&card->wandev.lock, *smp_flags);
3607 }
3608
3609 //*********** TTY SECTION ****************
3610
3611 static void wanpipe_tty_trigger_tx_irq(sdla_t *card)
3612 {
3613         SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
3614         INTERRUPT_INFORMATION_STRUCT *chdlc_int = &flags->interrupt_info_struct;
3615         chdlc_int->interrupt_permission |= APP_INT_ON_TX_FRAME;
3616 }
3617
3618 static void wanpipe_tty_trigger_poll(sdla_t *card)
3619 {
3620         schedule_work(&card->tty_work);
3621 }
3622
3623 static void tty_poll_work (void* data)
3624 {
3625         sdla_t *card = (sdla_t*)data;
3626         struct tty_struct *tty;
3627
3628         if ((tty=card->tty)==NULL)
3629                 return;
3630
3631         tty_wakeup(tty);
3632 #if defined(SERIAL_HAVE_POLL_WAIT)
3633         wake_up_interruptible(&tty->poll_wait);
3634 #endif
3635         return;
3636 }
3637
3638 static void wanpipe_tty_close(struct tty_struct *tty, struct file * filp)
3639 {
3640         sdla_t *card;
3641         unsigned long smp_flags;
3642
3643         if (!tty || !tty->driver_data){
3644                 return;
3645         }
3646
3647         card = (sdla_t*)tty->driver_data;
3648
3649         if (!card)
3650                 return;
3651
3652         printk(KERN_INFO "%s: Closing TTY Driver!\n",
3653                         card->devname);
3654
3655         /* Sanity Check */
3656         if (!card->tty_open)
3657                 return;
3658
3659         wanpipe_close(card);
3660         if (--card->tty_open == 0){
3661
3662                 lock_adapter_irq(&card->wandev.lock,&smp_flags);
3663                 card->tty=NULL;
3664                 chdlc_disable_comm_shutdown(card);
3665                 unlock_adapter_irq(&card->wandev.lock,&smp_flags);
3666
3667                 if (card->tty_buf){
3668                         kfree(card->tty_buf);
3669                         card->tty_buf=NULL;
3670                 }
3671
3672                 if (card->tty_rx){
3673                         kfree(card->tty_rx);
3674                         card->tty_rx=NULL;
3675                 }
3676         }
3677         return;
3678 }
3679 static int wanpipe_tty_open(struct tty_struct *tty, struct file * filp)
3680 {
3681         unsigned long smp_flags;
3682         sdla_t *card;
3683
3684         if (!tty){
3685                 return -ENODEV;
3686         }
3687
3688         if (!tty->driver_data){
3689                 int port;
3690                 port = tty->index;
3691                 if ((port < 0) || (port >= NR_PORTS))
3692                         return -ENODEV;
3693
3694                 tty->driver_data = WAN_CARD(port);
3695                 if (!tty->driver_data)
3696                         return -ENODEV;
3697         }
3698
3699         card = (sdla_t*)tty->driver_data;
3700
3701         if (!card){
3702                 lock_adapter_irq(&card->wandev.lock,&smp_flags);
3703                 card->tty=NULL;
3704                 unlock_adapter_irq(&card->wandev.lock,&smp_flags);
3705                 return -ENODEV;
3706         }
3707
3708         printk(KERN_INFO "%s: Opening TTY Driver!\n",
3709                         card->devname);
3710
3711         if (card->tty_open == 0){
3712                 lock_adapter_irq(&card->wandev.lock,&smp_flags);
3713                 card->tty=tty;
3714                 unlock_adapter_irq(&card->wandev.lock,&smp_flags);
3715
3716                 if (!card->tty_buf){
3717                         card->tty_buf = kmalloc(TTY_CHDLC_MAX_MTU, GFP_KERNEL);
3718                         if (!card->tty_buf){
3719                                 card->tty_buf=NULL;
3720                                 card->tty=NULL;
3721                                 return -ENOMEM;
3722                         }
3723                 }
3724
3725                 if (!card->tty_rx){
3726                         card->tty_rx = kmalloc(TTY_CHDLC_MAX_MTU, GFP_KERNEL);
3727                         if (!card->tty_rx){
3728                                 /* Free the buffer above */
3729                                 kfree(card->tty_buf);
3730                                 card->tty_buf=NULL;
3731                                 card->tty=NULL;
3732                                 return -ENOMEM;
3733                         }
3734                 }
3735         }
3736
3737         ++card->tty_open;
3738         wanpipe_open(card);
3739         return 0;
3740 }
3741
3742 static int wanpipe_tty_write(struct tty_struct * tty, const unsigned char *buf, int count)
3743 {
3744         unsigned long smp_flags=0;
3745         sdla_t *card=NULL;
3746
3747         if (!tty){
3748                 dbg_printk(KERN_INFO "NO TTY in Write\n");
3749                 return -ENODEV;
3750         }
3751
3752         card = (sdla_t *)tty->driver_data;
3753
3754         if (!card){
3755                 dbg_printk(KERN_INFO "No Card in TTY Write\n");
3756                 return -ENODEV;
3757         }
3758
3759         if (count > card->wandev.mtu){
3760                 dbg_printk(KERN_INFO "Frame too big in Write %i Max: %i\n",
3761                                 count,card->wandev.mtu);
3762                 return -EINVAL;
3763         }
3764
3765         if (card->wandev.state != WAN_CONNECTED){
3766                 dbg_printk(KERN_INFO "Card not connected in TTY Write\n");
3767                 return -EINVAL;
3768         }
3769
3770         /* Lock the 508 Card: SMP is supported */
3771         if(card->hw.type != SDLA_S514){
3772                 s508_lock(card,&smp_flags);
3773         }
3774
3775         if (test_and_set_bit(SEND_CRIT,(void*)&card->wandev.critical)){
3776                 printk(KERN_INFO "%s: Critical in TTY Write\n",
3777                                 card->devname);
3778
3779                 /* Lock the 508 Card: SMP is supported */
3780                 if(card->hw.type != SDLA_S514)
3781                         s508_unlock(card,&smp_flags);
3782
3783                 return -EINVAL;
3784         }
3785
3786         if (chdlc_send(card,(void*)buf,count)){
3787                 dbg_printk(KERN_INFO "%s: Failed to send, retry later: kernel!\n",
3788                                 card->devname);
3789                 clear_bit(SEND_CRIT,(void*)&card->wandev.critical);
3790
3791                 wanpipe_tty_trigger_tx_irq(card);
3792
3793                 if(card->hw.type != SDLA_S514)
3794                         s508_unlock(card,&smp_flags);
3795                 return 0;
3796         }
3797         dbg_printk(KERN_INFO "%s: Packet sent OK: %i\n",card->devname,count);
3798         clear_bit(SEND_CRIT,(void*)&card->wandev.critical);
3799
3800         if(card->hw.type != SDLA_S514)
3801                 s508_unlock(card,&smp_flags);
3802
3803         return count;
3804 }
3805
3806 static void wanpipe_tty_receive(sdla_t *card, unsigned addr, unsigned int len)
3807 {
3808         unsigned offset=0;
3809         unsigned olen=len;
3810         char fp=0;
3811         struct tty_struct *tty;
3812         int i;
3813         struct tty_ldisc *ld;
3814
3815         if (!card->tty_open){
3816                 dbg_printk(KERN_INFO "%s: TTY not open during receive\n",
3817                                 card->devname);
3818                 return;
3819         }
3820
3821         if ((tty=card->tty) == NULL){
3822                 dbg_printk(KERN_INFO "%s: No TTY on receive\n",
3823                                 card->devname);
3824                 return;
3825         }
3826
3827         if (!tty->driver_data){
3828                 dbg_printk(KERN_INFO "%s: No Driver Data, or Flip on receive\n",
3829                                 card->devname);
3830                 return;
3831         }
3832
3833
3834         if (card->u.c.async_mode){
3835                 if ((tty->flip.count+len) >= TTY_FLIPBUF_SIZE){
3836                         if (net_ratelimit()){
3837                                 printk(KERN_INFO
3838                                         "%s: Received packet size too big: %i bytes, Max: %i!\n",
3839                                         card->devname,len,TTY_FLIPBUF_SIZE);
3840                         }
3841                         return;
3842                 }
3843
3844
3845                 if((addr + len) > card->u.c.rx_top + 1) {
3846                         offset = card->u.c.rx_top - addr + 1;
3847
3848                         sdla_peek(&card->hw, addr, tty->flip.char_buf_ptr, offset);
3849
3850                         addr = card->u.c.rx_base;
3851                         len -= offset;
3852
3853                         tty->flip.char_buf_ptr+=offset;
3854                         tty->flip.count+=offset;
3855                         for (i=0;i<offset;i++){
3856                                 *tty->flip.flag_buf_ptr = 0;
3857                                 tty->flip.flag_buf_ptr++;
3858                         }
3859                 }
3860
3861                 sdla_peek(&card->hw, addr, tty->flip.char_buf_ptr, len);
3862
3863                 tty->flip.char_buf_ptr+=len;
3864                 card->tty->flip.count+=len;
3865                 for (i=0;i<len;i++){
3866                         *tty->flip.flag_buf_ptr = 0;
3867                         tty->flip.flag_buf_ptr++;
3868                 }
3869
3870                 tty->low_latency=1;
3871                 tty_flip_buffer_push(tty);
3872         }else{
3873                 if (!card->tty_rx){
3874                         if (net_ratelimit()){
3875                                 printk(KERN_INFO
3876                                 "%s: Receive sync buffer not available!\n",
3877                                  card->devname);
3878                         }
3879                         return;
3880                 }
3881
3882                 if (len > TTY_CHDLC_MAX_MTU){
3883                         if (net_ratelimit()){
3884                                 printk(KERN_INFO
3885                                 "%s: Received packet size too big: %i bytes, Max: %i!\n",
3886                                         card->devname,len,TTY_FLIPBUF_SIZE);
3887                         }
3888                         return;
3889                 }
3890
3891
3892                 if((addr + len) > card->u.c.rx_top + 1) {
3893                         offset = card->u.c.rx_top - addr + 1;
3894
3895                         sdla_peek(&card->hw, addr, card->tty_rx, offset);
3896
3897                         addr = card->u.c.rx_base;
3898                         len -= offset;
3899                 }
3900                 sdla_peek(&card->hw, addr, card->tty_rx+offset, len);
3901                 ld = tty_ldisc_ref(tty);
3902                 if (ld) {
3903                         if (ld->receive_buf)
3904                                 ld->receive_buf(tty,card->tty_rx,&fp,olen);
3905                         tty_ldisc_deref(ld);
3906                 }else{
3907                         if (net_ratelimit()){
3908                                 printk(KERN_INFO
3909                                         "%s: NO TTY Sync line discipline!\n",
3910                                         card->devname);
3911                         }
3912                 }
3913         }
3914
3915         dbg_printk(KERN_INFO "%s: Received Data %i\n",card->devname,olen);
3916         return;
3917 }
3918
3919 #if 0
3920 static int wanpipe_tty_ioctl(struct tty_struct *tty, struct file * file,
3921                     unsigned int cmd, unsigned long arg)
3922 {
3923         return -ENOIOCTLCMD;
3924 }
3925 #endif
3926
3927 static void wanpipe_tty_stop(struct tty_struct *tty)
3928 {
3929         return;
3930 }
3931
3932 static void wanpipe_tty_start(struct tty_struct *tty)
3933 {
3934         return;
3935 }
3936
3937 static int config_tty (sdla_t *card)
3938 {
3939         SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
3940
3941         /* Setup the Board for asynchronous mode */
3942         if (card->u.c.async_mode){
3943
3944                 if (set_asy_config(card)) {
3945                         printk (KERN_INFO "%s: Failed CHDLC Async configuration!\n",
3946                                 card->devname);
3947                         return -EINVAL;
3948                 }
3949         }else{
3950                 /* Setup the Board for CHDLC */
3951                 if (set_chdlc_config(card)) {
3952                         printk (KERN_INFO "%s: Failed CHDLC configuration!\n",
3953                                 card->devname);
3954                         return -EINVAL;
3955                 }
3956         }
3957
3958         /* Set interrupt mode and mask */
3959         if (chdlc_set_intr_mode(card, APP_INT_ON_RX_FRAME |
3960                                 APP_INT_ON_GLOBAL_EXCEP_COND |
3961                                 APP_INT_ON_TX_FRAME |
3962                                 APP_INT_ON_CHDLC_EXCEP_COND | APP_INT_ON_TIMER)){
3963                 printk (KERN_INFO "%s: Failed to set interrupt triggers!\n",
3964                                 card->devname);
3965                 return -EINVAL;
3966         }
3967
3968
3969         /* Mask the Transmit and Timer interrupt */
3970         flags->interrupt_info_struct.interrupt_permission &=
3971                 ~(APP_INT_ON_TX_FRAME | APP_INT_ON_TIMER);
3972
3973
3974         /* Enable communications */
3975         if (card->u.c.async_mode){
3976                 if (asy_comm_enable(card) != 0) {
3977                         printk(KERN_INFO "%s: Failed to enable async commnunication!\n",
3978                                         card->devname);
3979                         flags->interrupt_info_struct.interrupt_permission = 0;
3980                         card->u.c.comm_enabled=0;
3981                         chdlc_set_intr_mode(card,0);
3982                         return -EINVAL;
3983                 }
3984         }else{
3985                 if (chdlc_comm_enable(card) != 0) {
3986                         printk(KERN_INFO "%s: Failed to enable chdlc communications!\n",
3987                                         card->devname);
3988                         flags->interrupt_info_struct.interrupt_permission = 0;
3989                         card->u.c.comm_enabled=0;
3990                         chdlc_set_intr_mode(card,0);
3991                         return -EINVAL;
3992                 }
3993         }
3994
3995         /* Initialize Rx/Tx buffer control fields */
3996         init_chdlc_tx_rx_buff(card);
3997         port_set_state(card, WAN_CONNECTING);
3998         return 0;
3999 }
4000
4001
4002 static int change_speed(sdla_t *card, struct tty_struct *tty,
4003                          struct termios *old_termios)
4004 {
4005         int     baud, ret=0;
4006         unsigned cflag;
4007         int     dbits,sbits,parity,handshaking;
4008
4009         cflag = tty->termios->c_cflag;
4010
4011         /* There is always one stop bit */
4012         sbits=WANOPT_ONE;
4013
4014         /* Parity is defaulted to NONE */
4015         parity = WANOPT_NONE;
4016
4017         handshaking=0;
4018
4019         /* byte size and parity */
4020         switch (cflag & CSIZE) {
4021               case CS5: dbits = 5; break;
4022               case CS6: dbits = 6; break;
4023               case CS7: dbits = 7; break;
4024               case CS8: dbits = 8; break;
4025               /* Never happens, but GCC is too dumb to figure it out */
4026               default:  dbits = 8; break;
4027         }
4028
4029         /* One more stop bit should be supported, thus increment
4030          * the number of stop bits Max=2 */
4031         if (cflag & CSTOPB) {
4032                 sbits = WANOPT_TWO;
4033         }
4034         if (cflag & PARENB) {
4035                 parity = WANOPT_EVEN;
4036         }
4037         if (cflag & PARODD){
4038                 parity = WANOPT_ODD;
4039         }
4040
4041         /* Determine divisor based on baud rate */
4042         baud = tty_get_baud_rate(tty);
4043
4044         if (!baud)
4045                 baud = 9600;    /* B0 transition handled in rs_set_termios */
4046
4047         if (cflag & CRTSCTS) {
4048                 handshaking|=ASY_RTS_HS_FOR_RX;
4049         }
4050
4051         if (I_IGNPAR(tty))
4052                 parity = WANOPT_NONE;
4053
4054         if (I_IXOFF(tty)){
4055                 handshaking|=ASY_XON_XOFF_HS_FOR_RX;
4056                 handshaking|=ASY_XON_XOFF_HS_FOR_TX;
4057         }
4058
4059         if (I_IXON(tty)){
4060                 handshaking|=ASY_XON_XOFF_HS_FOR_RX;
4061                 handshaking|=ASY_XON_XOFF_HS_FOR_TX;
4062         }
4063
4064         if (card->u.c.async_mode){
4065                 if (card->wandev.bps != baud)
4066                         ret=1;
4067                 card->wandev.bps = baud;
4068         }
4069
4070         if (card->u.c.async_mode){
4071                 if (card->u.c.protocol_options != handshaking)
4072                         ret=1;
4073                 card->u.c.protocol_options = handshaking;
4074
4075                 if (card->u.c.tx_bits_per_char != dbits)
4076                         ret=1;
4077                 card->u.c.tx_bits_per_char = dbits;
4078
4079                 if (card->u.c.rx_bits_per_char != dbits)
4080                         ret=1;
4081                 card->u.c.rx_bits_per_char = dbits;
4082
4083                 if (card->u.c.stop_bits != sbits)
4084                         ret=1;
4085                 card->u.c.stop_bits = sbits;
4086
4087                 if (card->u.c.parity != parity)
4088                         ret=1;
4089                 card->u.c.parity = parity;
4090
4091                 card->u.c.break_timer = 50;
4092                 card->u.c.inter_char_timer = 10;
4093                 card->u.c.rx_complete_length = 100;
4094                 card->u.c.xon_char = 0xFE;
4095         }else{
4096                 card->u.c.protocol_options = HDLC_STREAMING_MODE;
4097         }
4098
4099         return ret;
4100 }
4101
4102
4103 static void wanpipe_tty_set_termios(struct tty_struct *tty, struct termios *old_termios)
4104 {
4105         sdla_t *card;
4106         int err=1;
4107
4108         if (!tty){
4109                 return;
4110         }
4111
4112         card = (sdla_t *)tty->driver_data;
4113
4114         if (!card)
4115                 return;
4116
4117         if (change_speed(card, tty, old_termios) || !card->u.c.comm_enabled){
4118                 unsigned long smp_flags;
4119
4120                 if (card->u.c.comm_enabled){
4121                         lock_adapter_irq(&card->wandev.lock,&smp_flags);
4122                         chdlc_disable_comm_shutdown(card);
4123                         unlock_adapter_irq(&card->wandev.lock,&smp_flags);
4124                 }
4125                 lock_adapter_irq(&card->wandev.lock,&smp_flags);
4126                 err = config_tty(card);
4127                 unlock_adapter_irq(&card->wandev.lock,&smp_flags);
4128                 if (card->u.c.async_mode){
4129                         printk(KERN_INFO "%s: TTY Async Configuration:\n"
4130                                  "   Baud        =%i\n"
4131                                  "   Handshaking =%s\n"
4132                                  "   Tx Dbits    =%i\n"
4133                                  "   Rx Dbits    =%i\n"
4134                                  "   Parity      =%s\n"
4135                                  "   Stop Bits   =%i\n",
4136                                  card->devname,
4137                                  card->wandev.bps,
4138                                  opt_decode[card->u.c.protocol_options],
4139                                  card->u.c.tx_bits_per_char,
4140                                  card->u.c.rx_bits_per_char,
4141                                  p_decode[card->u.c.parity] ,
4142                                  card->u.c.stop_bits);
4143                 }else{
4144                         printk(KERN_INFO "%s: TTY Sync Configuration:\n"
4145                                  "   Baud        =%i\n"
4146                                  "   Protocol    =HDLC_STREAMING\n",
4147                                  card->devname,card->wandev.bps);
4148                 }
4149                 if (!err){
4150                         port_set_state(card,WAN_CONNECTED);
4151                 }else{
4152                         port_set_state(card,WAN_DISCONNECTED);
4153                 }
4154         }
4155         return;
4156 }
4157
4158 static void wanpipe_tty_put_char(struct tty_struct *tty, unsigned char ch)
4159 {
4160         sdla_t *card;
4161         unsigned long smp_flags=0;
4162
4163         if (!tty){
4164                 return;
4165         }
4166
4167         card = (sdla_t *)tty->driver_data;
4168
4169         if (!card)
4170                 return;
4171
4172         if (card->wandev.state != WAN_CONNECTED)
4173                 return;
4174
4175         if(card->hw.type != SDLA_S514)
4176                 s508_lock(card,&smp_flags);
4177
4178         if (test_and_set_bit(SEND_CRIT,(void*)&card->wandev.critical)){
4179
4180                 wanpipe_tty_trigger_tx_irq(card);
4181
4182                 if(card->hw.type != SDLA_S514)
4183                         s508_unlock(card,&smp_flags);
4184                 return;
4185         }
4186
4187         if (chdlc_send(card,(void*)&ch,1)){
4188                 wanpipe_tty_trigger_tx_irq(card);
4189                 dbg_printk("%s: Failed to TX char!\n",card->devname);
4190         }
4191
4192         dbg_printk("%s: Char TX OK\n",card->devname);
4193
4194         clear_bit(SEND_CRIT,(void*)&card->wandev.critical);
4195
4196         if(card->hw.type != SDLA_S514)
4197                 s508_unlock(card,&smp_flags);
4198
4199         return;
4200 }
4201
4202 static void wanpipe_tty_flush_chars(struct tty_struct *tty)
4203 {
4204         return;
4205 }
4206
4207 static void wanpipe_tty_flush_buffer(struct tty_struct *tty)
4208 {
4209         if (!tty)
4210                 return;
4211
4212 #if defined(SERIAL_HAVE_POLL_WAIT)
4213         wake_up_interruptible(&tty->poll_wait);
4214 #endif
4215         tty_wakeup(tty);
4216         return;
4217 }
4218
4219 /*
4220  * This function is used to send a high-priority XON/XOFF character to
4221  * the device
4222  */
4223 static void wanpipe_tty_send_xchar(struct tty_struct *tty, char ch)
4224 {
4225         return;
4226 }
4227
4228
4229 static int wanpipe_tty_chars_in_buffer(struct tty_struct *tty)
4230 {
4231         return 0;
4232 }
4233
4234
4235 static int wanpipe_tty_write_room(struct tty_struct *tty)
4236 {
4237         sdla_t *card;
4238
4239         printk(KERN_INFO "TTY Write Room\n");
4240
4241         if (!tty){
4242                 return 0;
4243         }
4244
4245         card = (sdla_t *)tty->driver_data;
4246         if (!card)
4247                 return 0;
4248
4249         if (card->wandev.state != WAN_CONNECTED)
4250                 return 0;
4251
4252         return SEC_MAX_NO_DATA_BYTES_IN_FRAME;
4253 }
4254
4255
4256 static int set_modem_status(sdla_t *card, unsigned char data)
4257 {
4258         CHDLC_MAILBOX_STRUCT *mb = card->mbox;
4259         int err;
4260
4261         mb->buffer_length=1;
4262         mb->command=SET_MODEM_STATUS;
4263         mb->data[0]=data;
4264         err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
4265         if (err != COMMAND_OK)
4266                 chdlc_error (card, err, mb);
4267
4268         return err;
4269 }
4270
4271 static void wanpipe_tty_hangup(struct tty_struct *tty)
4272 {
4273         sdla_t *card;
4274         unsigned long smp_flags;
4275
4276         printk(KERN_INFO "TTY Hangup!\n");
4277
4278         if (!tty){
4279                 return;
4280         }
4281
4282         card = (sdla_t *)tty->driver_data;
4283         if (!card)
4284                 return;
4285
4286         lock_adapter_irq(&card->wandev.lock,&smp_flags);
4287         set_modem_status(card,0);
4288         unlock_adapter_irq(&card->wandev.lock,&smp_flags);
4289         return;
4290 }
4291
4292 static void wanpipe_tty_break(struct tty_struct *tty, int break_state)
4293 {
4294         return;
4295 }
4296
4297 static void wanpipe_tty_wait_until_sent(struct tty_struct *tty, int timeout)
4298 {
4299         return;
4300 }
4301
4302 static void wanpipe_tty_throttle(struct tty_struct * tty)
4303 {
4304         return;
4305 }
4306
4307 static void wanpipe_tty_unthrottle(struct tty_struct * tty)
4308 {
4309         return;
4310 }
4311
4312 int wanpipe_tty_read_proc(char *page, char **start, off_t off, int count,
4313                  int *eof, void *data)
4314 {
4315         return 0;
4316 }
4317
4318 /*
4319  * The serial driver boot-time initialization code!
4320  */
4321 int wanpipe_tty_init(sdla_t *card)
4322 {
4323         struct serial_state * state;
4324
4325         /* Initialize the tty_driver structure */
4326
4327         if (card->tty_minor < 0 || card->tty_minor > NR_PORTS){
4328                 printk(KERN_INFO "%s: Illegal Minor TTY number (0-4): %i\n",
4329                                 card->devname,card->tty_minor);
4330                 return -EINVAL;
4331         }
4332
4333         if (WAN_CARD(card->tty_minor)){
4334                 printk(KERN_INFO "%s: TTY Minor %i, already in use\n",
4335                                 card->devname,card->tty_minor);
4336                 return -EBUSY;
4337         }
4338
4339         if (tty_init_cnt==0){
4340
4341                 printk(KERN_INFO "%s: TTY %s Driver Init: Major %i, Minor Range %i-%i\n",
4342                                 card->devname,
4343                                 card->u.c.async_mode ? "ASYNC" : "SYNC",
4344                                 WAN_TTY_MAJOR,MIN_PORT,MAX_PORT);
4345
4346                 tty_driver_mode = card->u.c.async_mode;
4347
4348                 memset(&serial_driver, 0, sizeof(struct tty_driver));
4349                 serial_driver.magic = TTY_DRIVER_MAGIC;
4350                 serial_driver.owner = THIS_MODULE;
4351                 serial_driver.driver_name = "wanpipe_tty";
4352                 serial_driver.name = "ttyW";
4353                 serial_driver.major = WAN_TTY_MAJOR;
4354                 serial_driver.minor_start = WAN_TTY_MINOR;
4355                 serial_driver.num = NR_PORTS;
4356                 serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
4357                 serial_driver.subtype = SERIAL_TYPE_NORMAL;
4358
4359                 serial_driver.init_termios = tty_std_termios;
4360                 serial_driver.init_termios.c_cflag =
4361                         B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4362                 serial_driver.flags = TTY_DRIVER_REAL_RAW;
4363
4364                 serial_driver.refcount = 1;     /* !@!@^#^&!! */
4365
4366                 serial_driver.open = wanpipe_tty_open;
4367                 serial_driver.close = wanpipe_tty_close;
4368                 serial_driver.write = wanpipe_tty_write;
4369
4370                 serial_driver.put_char = wanpipe_tty_put_char;
4371                 serial_driver.flush_chars = wanpipe_tty_flush_chars;
4372                 serial_driver.write_room = wanpipe_tty_write_room;
4373                 serial_driver.chars_in_buffer = wanpipe_tty_chars_in_buffer;
4374                 serial_driver.flush_buffer = wanpipe_tty_flush_buffer;
4375                 //serial_driver.ioctl = wanpipe_tty_ioctl;
4376                 serial_driver.throttle = wanpipe_tty_throttle;
4377                 serial_driver.unthrottle = wanpipe_tty_unthrottle;
4378                 serial_driver.send_xchar = wanpipe_tty_send_xchar;
4379                 serial_driver.set_termios = wanpipe_tty_set_termios;
4380                 serial_driver.stop = wanpipe_tty_stop;
4381                 serial_driver.start = wanpipe_tty_start;
4382                 serial_driver.hangup = wanpipe_tty_hangup;
4383                 serial_driver.break_ctl = wanpipe_tty_break;
4384                 serial_driver.wait_until_sent = wanpipe_tty_wait_until_sent;
4385                 serial_driver.read_proc = wanpipe_tty_read_proc;
4386
4387                 if (tty_register_driver(&serial_driver)){
4388                         printk(KERN_INFO "%s: Failed to register serial driver!\n",
4389                                         card->devname);
4390                 }
4391         }
4392
4393
4394         /* The subsequent ports must comply to the initial configuration */
4395         if (tty_driver_mode != card->u.c.async_mode){
4396                 printk(KERN_INFO "%s: Error: TTY Driver operation mode mismatch!\n",
4397                                 card->devname);
4398                 printk(KERN_INFO "%s: The TTY driver is configured for %s!\n",
4399                                 card->devname, tty_driver_mode ? "ASYNC" : "SYNC");
4400                 return -EINVAL;
4401         }
4402
4403         tty_init_cnt++;
4404
4405         printk(KERN_INFO "%s: Initializing TTY %s Driver Minor %i\n",
4406                         card->devname,
4407                         tty_driver_mode ? "ASYNC" : "SYNC",
4408                         card->tty_minor);
4409
4410         tty_card_map[card->tty_minor] = card;
4411         state = &rs_table[card->tty_minor];
4412
4413         state->magic = SSTATE_MAGIC;
4414         state->line = 0;
4415         state->type = PORT_UNKNOWN;
4416         state->custom_divisor = 0;
4417         state->close_delay = 5*HZ/10;
4418         state->closing_wait = 30*HZ;
4419         state->icount.cts = state->icount.dsr =
4420                 state->icount.rng = state->icount.dcd = 0;
4421         state->icount.rx = state->icount.tx = 0;
4422         state->icount.frame = state->icount.parity = 0;
4423         state->icount.overrun = state->icount.brk = 0;
4424         state->irq = card->wandev.irq;
4425
4426         INIT_WORK(&card->tty_work, tty_poll_work, (void*)card);
4427         return 0;
4428 }
4429
4430
4431 MODULE_LICENSE("GPL");
4432
4433 /****** End ****************************************************************/