drivers/net/wan/pc300_tty.c

   1 /*
   2  * pc300_tty.c  Cyclades-PC300(tm) TTY Driver.
   3  *
   4  * Author:      Regina Kodato <reginak@cyclades.com>
   5  *
   6  * Copyright:   (c) 1999-2002 Cyclades Corp.
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU General Public License
  10  *  as published by the Free Software Foundation; either version
  11  *  2 of the License, or (at your option) any later version.
  12  *
  13  *  $Log: pc300_tty.c,v $
  14  *  Revision 3.7  2002/03/07 14:17:09  henrique
  15  *  License data fixed
  16  *
  17  *  Revision 3.6  2001/12/10 12:29:42  regina
  18  *  Fix the MLPPP bug
  19  *
  20  *  Revision 3.5  2001/10/31 11:20:05  regina
  21  *  automatic pppd starts
  22  *
  23  *  Revision 3.4  2001/08/06 12:01:51  regina
  24  *  problem in DSR_DE bit
  25  *
  26  *  Revision 3.3  2001/07/26 22:58:41  regina
  27  *  update EDA value
  28  *
  29  *  Revision 3.2  2001/07/12 13:11:20  regina
  30  *  bug fix - DCD-OFF in pc300 tty driver
  31  *
  32  *      DMA transmission bug fix
  33  *
  34  *  Revision 3.1  2001/06/22 13:13:02  regina
  35  *  MLPPP implementation
  36  *
  37  */
  38
  39 #include <linux/module.h>
  40 #include <linux/kernel.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/init.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/slab.h>
  47 #include <linux/if.h>
  48 #include <linux/skbuff.h>
  49 /* TTY includes */
  50 #include <linux/tty.h>
  51 #include <linux/tty_flip.h>
  52 #include <linux/serial.h>
  53
  54 #include <asm/io.h>
  55 #include <asm/uaccess.h>
  56
  57 #include "pc300.h"
  58
  59 /* defines and macros */
  60 /* TTY Global definitions */
  61 #define CPC_TTY_NPORTS  8       /* maximum number of the sync tty connections */
  62 #define CPC_TTY_MAJOR   CYCLADES_MAJOR
  63 #define CPC_TTY_MINOR_START     240     /* minor of the first PC300 interface */
  64
  65 #define CPC_TTY_MAX_MTU 2000
  66
  67 /* tty interface state */
  68 #define CPC_TTY_ST_IDLE 0
  69 #define CPC_TTY_ST_INIT 1       /* configured with MLPPP and up */
  70 #define CPC_TTY_ST_OPEN 2       /* opened by application */
  71
  72 #define CPC_TTY_LOCK(card,flags)\
  73         do {\
  74                 spin_lock_irqsave(&card->card_lock, flags);     \
  75         } while (0)
  76
  77 #define CPC_TTY_UNLOCK(card,flags)      \
  78         do {\
  79                 spin_unlock_irqrestore(&card->card_lock, flags);        \
  80         } while (0)
  81
  82 //#define       CPC_TTY_DBG(format,a...)        printk(format,##a)
  83 #define CPC_TTY_DBG(format,a...)
  84
  85 /* data structures */
  86 typedef struct _st_cpc_rx_buf {
  87         struct _st_cpc_rx_buf   *next;
  88         int             size;
  89         unsigned char   data[1];
  90 } st_cpc_rx_buf;
  91
  92 struct st_cpc_rx_list {
  93         st_cpc_rx_buf   *first;
  94         st_cpc_rx_buf   *last;
  95 };
  96
  97 typedef struct _st_cpc_tty_area {
  98         int             state;          /* state of the TTY interface */
  99         int             num_open;
 100         unsigned int    tty_minor;      /* minor this interface */
 101         volatile struct st_cpc_rx_list buf_rx;  /* ptr. to reception buffer */
 102         unsigned char*  buf_tx;         /* ptr. to transmission buffer */
 103         pc300dev_t*     pc300dev;       /* ptr. to info struct in PC300 driver */
 104         unsigned char   name[20];       /* interf. name + "-tty" */
 105         struct tty_struct *tty;
 106         struct work_struct tty_tx_work; /* tx work - tx interrupt */
 107         struct work_struct tty_rx_work; /* rx work - rx interrupt */
 108         } st_cpc_tty_area;
 109
 110 /* TTY data structures */
 111 static struct tty_driver serial_drv;
 112
 113 /* local variables */
 114 static st_cpc_tty_area  cpc_tty_area[CPC_TTY_NPORTS];
 115
 116 static int cpc_tty_cnt = 0;     /* number of intrfaces configured with MLPPP */
 117 static int cpc_tty_unreg_flag = 0;
 118
 119 /* TTY functions prototype */
 120 static int cpc_tty_open(struct tty_struct *tty, struct file *flip);
 121 static void cpc_tty_close(struct tty_struct *tty, struct file *flip);
 122 static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
 123 static int cpc_tty_write_room(struct tty_struct *tty);
 124 static int cpc_tty_chars_in_buffer(struct tty_struct *tty);
 125 static void cpc_tty_flush_buffer(struct tty_struct *tty);
 126 static void cpc_tty_hangup(struct tty_struct *tty);
 127 static void cpc_tty_rx_work(struct work_struct *work);
 128 static void cpc_tty_tx_work(struct work_struct *work);
 129 static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len);
 130 static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx);
 131 static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char);
 132 static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char);
 133
 134 static int pc300_tiocmset(struct tty_struct *, struct file *,
 135                           unsigned int, unsigned int);
 136 static int pc300_tiocmget(struct tty_struct *, struct file *);
 137
 138 /* functions called by PC300 driver */
 139 void cpc_tty_init(pc300dev_t *dev);
 140 void cpc_tty_unregister_service(pc300dev_t *pc300dev);
 141 void cpc_tty_receive(pc300dev_t *pc300dev);
 142 void cpc_tty_trigger_poll(pc300dev_t *pc300dev);
 143 void cpc_tty_reset_var(void);
 144
 145 /*
 146  * PC300 TTY clear "signal"
 147  */
 148 static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal)
 149 {
 150         pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
 151         pc300_t *card = (pc300_t *) pc300chan->card;
 152         int ch = pc300chan->channel;
 153         unsigned long flags;
 154
 155         CPC_TTY_DBG("%s-tty: Clear signal %x\n",
 156                 pc300dev->dev->name, signal);
 157         CPC_TTY_LOCK(card, flags);
 158         cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
 159                 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& signal);
 160         CPC_TTY_UNLOCK(card,flags);
 161 }
 162
 163 /*
 164  * PC300 TTY set "signal" to ON
 165  */
 166 static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char signal)
 167 {
 168         pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
 169         pc300_t *card = (pc300_t *) pc300chan->card;
 170         int ch = pc300chan->channel;
 171         unsigned long flags;
 172
 173         CPC_TTY_DBG("%s-tty: Set signal %x\n",
 174                 pc300dev->dev->name, signal);
 175         CPC_TTY_LOCK(card, flags);
 176         cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
 177                 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~signal);
 178         CPC_TTY_UNLOCK(card,flags);
 179 }
 180
 181
 182 static const struct tty_operations pc300_ops = {
 183         .open = cpc_tty_open,
 184         .close = cpc_tty_close,
 185         .write = cpc_tty_write,
 186         .write_room = cpc_tty_write_room,
 187         .chars_in_buffer = cpc_tty_chars_in_buffer,
 188         .tiocmset = pc300_tiocmset,
 189         .tiocmget = pc300_tiocmget,
 190         .flush_buffer = cpc_tty_flush_buffer,
 191         .hangup = cpc_tty_hangup,
 192 };
 193
 194
 195 /*
 196  * PC300 TTY initialization routine
 197  *
 198  * This routine is called by the PC300 driver during board configuration
 199  * (ioctl=SIOCSP300CONF). At this point the adapter is completely
 200  * initialized.
 201  * o verify kernel version (only 2.4.x)
 202  * o register TTY driver
 203  * o init cpc_tty_area struct
 204  */
 205 void cpc_tty_init(pc300dev_t *pc300dev)
 206 {
 207         unsigned long port;
 208         int aux;
 209         st_cpc_tty_area * cpc_tty;
 210
 211         /* hdlcX - X=interface number */
 212         port = pc300dev->dev->name[4] - '0';
 213         if (port >= CPC_TTY_NPORTS) {
 214                 printk("%s-tty: invalid interface selected (0-%i): %li",
 215                         pc300dev->dev->name,
 216                         CPC_TTY_NPORTS-1,port);
 217                 return;
 218         }
 219
 220         if (cpc_tty_cnt == 0) { /* first TTY connection -> register driver */
 221                 CPC_TTY_DBG("%s-tty: driver init, major:%i, minor range:%i=%i\n",
 222                         pc300dev->dev->name,
 223                         CPC_TTY_MAJOR, CPC_TTY_MINOR_START,
 224                         CPC_TTY_MINOR_START+CPC_TTY_NPORTS);
 225                 /* initialize tty driver struct */
 226                 memset(&serial_drv,0,sizeof(struct tty_driver));
 227                 serial_drv.magic = TTY_DRIVER_MAGIC;
 228                 serial_drv.owner = THIS_MODULE;
 229                 serial_drv.driver_name = "pc300_tty";
 230                 serial_drv.name = "ttyCP";
 231                 serial_drv.major = CPC_TTY_MAJOR;
 232                 serial_drv.minor_start = CPC_TTY_MINOR_START;
 233                 serial_drv.num = CPC_TTY_NPORTS;
 234                 serial_drv.type = TTY_DRIVER_TYPE_SERIAL;
 235                 serial_drv.subtype = SERIAL_TYPE_NORMAL;
 236
 237                 serial_drv.init_termios = tty_std_termios;
 238                 serial_drv.init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
 239                 serial_drv.flags = TTY_DRIVER_REAL_RAW;
 240
 241                 /* interface routines from the upper tty layer to the tty driver */
 242                 tty_set_operations(&serial_drv, &pc300_ops);
 243
 244                 /* register the TTY driver */
 245                 if (tty_register_driver(&serial_drv)) {
 246                         printk("%s-tty: Failed to register serial driver! ",
 247                                 pc300dev->dev->name);
 248                         return;
 249                 }
 250
 251                 memset((void *)cpc_tty_area, 0,
 252                                                                 sizeof(st_cpc_tty_area) * CPC_TTY_NPORTS);
 253         }
 254
 255         cpc_tty = &cpc_tty_area[port];
 256
 257         if (cpc_tty->state != CPC_TTY_ST_IDLE) {
 258                 CPC_TTY_DBG("%s-tty: TTY port %i, already in use.\n",
 259                                 pc300dev->dev->name, port);
 260                 return;
 261         }
 262
 263         cpc_tty_cnt++;
 264         cpc_tty->state = CPC_TTY_ST_INIT;
 265         cpc_tty->num_open= 0;
 266         cpc_tty->tty_minor = port + CPC_TTY_MINOR_START;
 267         cpc_tty->pc300dev = pc300dev;
 268
 269         INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work);
 270         INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work);
 271
 272         cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = NULL;
 273
 274         pc300dev->cpc_tty = (void *)cpc_tty;
 275
 276         aux = strlen(pc300dev->dev->name);
 277         memcpy(cpc_tty->name, pc300dev->dev->name, aux);
 278         memcpy(&cpc_tty->name[aux], "-tty", 5);
 279
 280         cpc_open(pc300dev->dev);
 281         cpc_tty_signal_off(pc300dev, CTL_DTR);
 282
 283         CPC_TTY_DBG("%s: Initializing TTY Sync Driver, tty major#%d minor#%i\n",
 284                         cpc_tty->name,CPC_TTY_MAJOR,cpc_tty->tty_minor);
 285         return;
 286 }
 287
 288 /*
 289  * PC300 TTY OPEN routine
 290  *
 291  * This routine is called by the tty driver to open the interface
 292  * o verify minor
 293  * o allocate buffer to Rx and Tx
 294  */
 295 static int cpc_tty_open(struct tty_struct *tty, struct file *flip)
 296 {
 297         int port ;
 298         st_cpc_tty_area *cpc_tty;
 299
 300         if (!tty) {
 301                 return -ENODEV;
 302         }
 303
 304         port = tty->index;
 305
 306         if ((port < 0) || (port >= CPC_TTY_NPORTS)){
 307                 CPC_TTY_DBG("pc300_tty: open invalid port %d\n", port);
 308                 return -ENODEV;
 309         }
 310
 311         cpc_tty = &cpc_tty_area[port];
 312
 313         if (cpc_tty->state == CPC_TTY_ST_IDLE){
 314                 CPC_TTY_DBG("%s: open - invalid interface, port=%d\n",
 315                                         cpc_tty->name, tty->index);
 316                 return -ENODEV;
 317         }
 318
 319         if (cpc_tty->num_open == 0) { /* first open of this tty */
 320                 if (!cpc_tty_area[port].buf_tx){
 321                         cpc_tty_area[port].buf_tx = kmalloc(CPC_TTY_MAX_MTU,GFP_KERNEL);
 322                         if (!cpc_tty_area[port].buf_tx) {
 323                                 CPC_TTY_DBG("%s: error in memory allocation\n",cpc_tty->name);
 324                                 return -ENOMEM;
 325                         }
 326                 }
 327
 328                 if (cpc_tty_area[port].buf_rx.first) {
 329                         unsigned char * aux;
 330                         while (cpc_tty_area[port].buf_rx.first) {
 331                                 aux = (unsigned char *)cpc_tty_area[port].buf_rx.first;
 332                                 cpc_tty_area[port].buf_rx.first = cpc_tty_area[port].buf_rx.first->next;
 333                                 kfree(aux);
 334                         }
 335                         cpc_tty_area[port].buf_rx.first = NULL;
 336                         cpc_tty_area[port].buf_rx.last = NULL;
 337                 }
 338
 339                 cpc_tty_area[port].state = CPC_TTY_ST_OPEN;
 340                 cpc_tty_area[port].tty = tty;
 341                 tty->driver_data = &cpc_tty_area[port];
 342
 343                 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
 344         }
 345
 346         cpc_tty->num_open++;
 347
 348         CPC_TTY_DBG("%s: opening TTY driver\n", cpc_tty->name);
 349
 350         /* avisar driver PC300 */
 351         return 0;
 352 }
 353
 354 /*
 355  * PC300 TTY CLOSE routine
 356  *
 357  * This routine is called by the tty driver to close the interface
 358  * o call close channel in PC300 driver (cpc_closech)
 359  * o free Rx and Tx buffers
 360  */
 361
 362 static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
 363 {
 364         st_cpc_tty_area    *cpc_tty;
 365         unsigned long flags;
 366         int res;
 367
 368         if (!tty || !tty->driver_data ) {
 369                 CPC_TTY_DBG("hdlx-tty: no TTY in close \n");
 370                 return;
 371         }
 372
 373         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 374
 375         if ((cpc_tty->tty != tty)|| (cpc_tty->state != CPC_TTY_ST_OPEN)) {
 376                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
 377                 return;
 378         }
 379
 380         if (!cpc_tty->num_open) {
 381                 CPC_TTY_DBG("%s: TTY is closed\n",cpc_tty->name);
 382                 return;
 383         }
 384
 385         if (--cpc_tty->num_open > 0) {
 386                 CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
 387                 return;
 388         }
 389
 390         cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
 391
 392         CPC_TTY_LOCK(cpc_tty->pc300dev->chan->card, flags);  /* lock irq */
 393         cpc_tty->tty = NULL;
 394         cpc_tty->state = CPC_TTY_ST_INIT;
 395         CPC_TTY_UNLOCK(cpc_tty->pc300dev->chan->card, flags); /* unlock irq */
 396
 397         if (cpc_tty->buf_rx.first) {
 398                 unsigned char * aux;
 399                 while (cpc_tty->buf_rx.first) {
 400                         aux = (unsigned char *)cpc_tty->buf_rx.first;
 401                         cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
 402                         kfree(aux);
 403                 }
 404                 cpc_tty->buf_rx.first = NULL;
 405                 cpc_tty->buf_rx.last = NULL;
 406         }
 407
 408         kfree(cpc_tty->buf_tx);
 409         cpc_tty->buf_tx = NULL;
 410
 411         CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
 412
 413         if (!serial_drv.refcount && cpc_tty_unreg_flag) {
 414                 cpc_tty_unreg_flag = 0;
 415                 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
 416                 if ((res=tty_unregister_driver(&serial_drv))) {
 417                         CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
 418                                                         cpc_tty->name,res);
 419                 }
 420         }
 421         return;
 422 }
 423
 424 /*
 425  * PC300 TTY WRITE routine
 426  *
 427  * This routine is called by the tty driver to write a series of characters
 428  * to the tty device. The characters may come from user or kernel space.
 429  * o verify the DCD signal
 430  * o send characters to board and start the transmission
 431  */
 432 static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 433 {
 434         st_cpc_tty_area    *cpc_tty;
 435         pc300ch_t *pc300chan;
 436         pc300_t *card;
 437         int ch;
 438         unsigned long flags;
 439         struct net_device_stats *stats;
 440
 441         if (!tty || !tty->driver_data ) {
 442                 CPC_TTY_DBG("hdlcX-tty: no TTY in write\n");
 443                 return -ENODEV;
 444         }
 445
 446         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 447
 448         if ((cpc_tty->tty != tty) ||  (cpc_tty->state != CPC_TTY_ST_OPEN)) {
 449                 CPC_TTY_DBG("%s: TTY is not opened\n", cpc_tty->name);
 450                 return -ENODEV;
 451         }
 452
 453         if (count > CPC_TTY_MAX_MTU) {
 454                 CPC_TTY_DBG("%s: count is invalid\n",cpc_tty->name);
 455                 return -EINVAL;        /* frame too big */
 456         }
 457
 458         CPC_TTY_DBG("%s: cpc_tty_write data len=%i\n",cpc_tty->name,count);
 459
 460         pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan;
 461         stats = &cpc_tty->pc300dev->dev->stats;
 462         card = (pc300_t *) pc300chan->card;
 463         ch = pc300chan->channel;
 464
 465         /* verify DCD signal*/
 466         if (cpc_readb(card->hw.scabase + M_REG(ST3,ch)) & ST3_DCD) {
 467                 /* DCD is OFF */
 468                 CPC_TTY_DBG("%s : DCD is OFF\n", cpc_tty->name);
 469                 stats->tx_errors++;
 470                 stats->tx_carrier_errors++;
 471                 CPC_TTY_LOCK(card, flags);
 472                 cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_BUF_CLR);
 473
 474                 if (card->hw.type == PC300_TE) {
 475                         cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
 476                                 cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) &
 477                                 ~(CPLD_REG2_FALC_LED1 << (2 *ch)));
 478                 }
 479
 480                 CPC_TTY_UNLOCK(card, flags);
 481
 482                 return -EINVAL;
 483         }
 484
 485         if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*)buf, count)) {
 486            /* failed to send */
 487            CPC_TTY_DBG("%s: trasmition error\n", cpc_tty->name);
 488            return 0;
 489         }
 490         return count;
 491 }
 492
 493 /*
 494  * PC300 TTY Write Room routine
 495  *
 496  * This routine returns the numbers of characteres the tty driver will accept
 497  * for queuing to be written.
 498  * o return MTU
 499  */
 500 static int cpc_tty_write_room(struct tty_struct *tty)
 501 {
 502         st_cpc_tty_area    *cpc_tty;
 503
 504         if (!tty || !tty->driver_data ) {
 505                 CPC_TTY_DBG("hdlcX-tty: no TTY to write room\n");
 506                 return -ENODEV;
 507         }
 508
 509         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 510
 511         if ((cpc_tty->tty != tty) ||  (cpc_tty->state != CPC_TTY_ST_OPEN)) {
 512                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
 513                 return -ENODEV;
 514         }
 515
 516         CPC_TTY_DBG("%s: write room\n",cpc_tty->name);
 517
 518         return CPC_TTY_MAX_MTU;
 519 }
 520
 521 /*
 522  * PC300 TTY chars in buffer routine
 523  *
 524  * This routine returns the chars number in the transmission buffer
 525  * o returns 0
 526  */
 527 static int cpc_tty_chars_in_buffer(struct tty_struct *tty)
 528 {
 529         st_cpc_tty_area    *cpc_tty;
 530
 531         if (!tty || !tty->driver_data ) {
 532                 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
 533                 return -ENODEV;
 534         }
 535
 536         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 537
 538         if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
 539                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
 540                 return -ENODEV;
 541         }
 542
 543         return(0);
 544 }
 545
 546 static int pc300_tiocmset(struct tty_struct *tty, struct file *file,
 547                           unsigned int set, unsigned int clear)
 548 {
 549         st_cpc_tty_area    *cpc_tty;
 550
 551         CPC_TTY_DBG("%s: set:%x clear:%x\n", __FUNCTION__, set, clear);
 552
 553         if (!tty || !tty->driver_data ) {
 554                 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
 555                 return -ENODEV;
 556         }
 557
 558         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 559
 560         if (set & TIOCM_RTS)
 561                 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_RTS);
 562         if (set & TIOCM_DTR)
 563                 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
 564
 565         if (clear & TIOCM_RTS)
 566                 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_RTS);
 567         if (clear & TIOCM_DTR)
 568                 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
 569
 570         return 0;
 571 }
 572
 573 static int pc300_tiocmget(struct tty_struct *tty, struct file *file)
 574 {
 575         unsigned int result;
 576         unsigned char status;
 577         unsigned long flags;
 578         st_cpc_tty_area  *cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 579         pc300dev_t *pc300dev = cpc_tty->pc300dev;
 580         pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
 581         pc300_t *card = (pc300_t *) pc300chan->card;
 582         int ch = pc300chan->channel;
 583
 584         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 585
 586         CPC_TTY_DBG("%s-tty: tiocmget\n",
 587                 ((struct net_device*)(pc300dev->hdlc))->name);
 588
 589         CPC_TTY_LOCK(card, flags);
 590         status = cpc_readb(card->hw.scabase+M_REG(CTL,ch));
 591         CPC_TTY_UNLOCK(card,flags);
 592
 593         result = ((status & CTL_DTR) ? TIOCM_DTR : 0) |
 594                  ((status & CTL_RTS) ? TIOCM_RTS : 0);
 595
 596         return result;
 597 }
 598
 599 /*
 600  * PC300 TTY Flush Buffer routine
 601  *
 602  * This routine resets the transmission buffer
 603  */
 604 static void cpc_tty_flush_buffer(struct tty_struct *tty)
 605 {
 606         st_cpc_tty_area    *cpc_tty;
 607
 608         if (!tty || !tty->driver_data ) {
 609                 CPC_TTY_DBG("hdlcX-tty: no TTY to flush buffer\n");
 610                 return;
 611         }
 612
 613         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 614
 615         if ((cpc_tty->tty != tty) ||  (cpc_tty->state != CPC_TTY_ST_OPEN)) {
 616                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
 617                 return;
 618         }
 619
 620         CPC_TTY_DBG("%s: call wake_up_interruptible\n",cpc_tty->name);
 621
 622         tty_wakeup(tty);
 623         return;
 624 }
 625
 626 /*
 627  * PC300 TTY Hangup routine
 628  *
 629  * This routine is called by the tty driver to hangup the interface
 630  * o clear DTR signal
 631  */
 632
 633 static void cpc_tty_hangup(struct tty_struct *tty)
 634 {
 635         st_cpc_tty_area    *cpc_tty;
 636         int res;
 637
 638         if (!tty || !tty->driver_data ) {
 639                 CPC_TTY_DBG("hdlcX-tty: no TTY to hangup\n");
 640                 return ;
 641         }
 642
 643         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
 644
 645         if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
 646                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
 647                 return ;
 648         }
 649         if (!serial_drv.refcount && cpc_tty_unreg_flag) {
 650                 cpc_tty_unreg_flag = 0;
 651                 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
 652                 if ((res=tty_unregister_driver(&serial_drv))) {
 653                         CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
 654                                                         cpc_tty->name,res);
 655                 }
 656         }
 657         cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
 658 }
 659
 660 /*
 661  * PC300 TTY RX work routine
 662  * This routine treats RX work
 663  * o verify read buffer
 664  * o call the line disc. read
 665  * o free memory
 666  */
 667 static void cpc_tty_rx_work(struct work_struct *work)
 668 {
 669         st_cpc_tty_area *cpc_tty;
 670         unsigned long port;
 671         int i, j;
 672         volatile st_cpc_rx_buf *buf;
 673         char flags=0,flg_rx=1;
 674         struct tty_ldisc *ld;
 675
 676         if (cpc_tty_cnt == 0) return;
 677
 678         for (i=0; (i < 4) && flg_rx ; i++) {
 679                 flg_rx = 0;
 680
 681                 cpc_tty = container_of(work, st_cpc_tty_area, tty_rx_work);
 682                 port = cpc_tty - cpc_tty_area;
 683
 684                 for (j=0; j < CPC_TTY_NPORTS; j++) {
 685                         cpc_tty = &cpc_tty_area[port];
 686
 687                         if ((buf=cpc_tty->buf_rx.first) != NULL) {
 688                                 if (cpc_tty->tty) {
 689                                         ld = tty_ldisc_ref(cpc_tty->tty);
 690                                         if (ld) {
 691                                                 if (ld->ops->receive_buf) {
 692                                                         CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
 693                                                         ld->ops->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size);
 694                                                 }
 695                                                 tty_ldisc_deref(ld);
 696                                         }
 697                                 }
 698                                 cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
 699                                 kfree((void *)buf);
 700                                 buf = cpc_tty->buf_rx.first;
 701                                 flg_rx = 1;
 702                         }
 703                         if (++port == CPC_TTY_NPORTS) port = 0;
 704                 }
 705         }
 706 }
 707
 708 /*
 709  * PC300 TTY RX work routine
 710  *
 711  * This routine treats RX interrupt.
 712  * o read all frames in card
 713  * o verify the frame size
 714  * o read the frame in rx buffer
 715  */
 716 static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
 717 {
 718         volatile pcsca_bd_t __iomem * ptdescr;
 719         volatile unsigned char status;
 720         pc300_t *card = (pc300_t *)pc300chan->card;
 721         int ch = pc300chan->channel;
 722
 723         /* dma buf read */
 724         ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
 725                                 RX_BD_ADDR(ch, pc300chan->rx_first_bd));
 726         while (pc300chan->rx_first_bd != pc300chan->rx_last_bd) {
 727                 status = cpc_readb(&ptdescr->status);
 728                 cpc_writeb(&ptdescr->status, 0);
 729                 cpc_writeb(&ptdescr->len, 0);
 730                 pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
 731                                         (N_DMA_RX_BUF - 1);
 732                 if (status & DST_EOM) {
 733                         break; /* end of message */
 734                 }
 735                 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + cpc_readl(&ptdescr->next));
 736         }
 737 }
 738
 739 void cpc_tty_receive(pc300dev_t *pc300dev)
 740 {
 741         st_cpc_tty_area *cpc_tty;
 742         pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
 743         pc300_t *card = (pc300_t *)pc300chan->card;
 744         int ch = pc300chan->channel;
 745         volatile pcsca_bd_t  __iomem * ptdescr;
 746         struct net_device_stats *stats = &pc300dev->dev->stats;
 747         int rx_len, rx_aux;
 748         volatile unsigned char status;
 749         unsigned short first_bd = pc300chan->rx_first_bd;
 750         st_cpc_rx_buf *new = NULL;
 751         unsigned char dsr_rx;
 752
 753         if (pc300dev->cpc_tty == NULL) {
 754                 return;
 755         }
 756
 757         dsr_rx = cpc_readb(card->hw.scabase + DSR_RX(ch));
 758
 759         cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
 760
 761         while (1) {
 762                 rx_len = 0;
 763                 ptdescr = (pcsca_bd_t  __iomem *)(card->hw.rambase + RX_BD_ADDR(ch, first_bd));
 764                 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
 765                         rx_len += cpc_readw(&ptdescr->len);
 766                         first_bd = (first_bd + 1) & (N_DMA_RX_BUF - 1);
 767                         if (status & DST_EOM) {
 768                                 break;
 769                         }
 770                         ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
 771                 }
 772
 773                 if (!rx_len) {
 774                         if (dsr_rx & DSR_BOF) {
 775                                 /* update EDA */
 776                                 cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
 777                                                 RX_BD_ADDR(ch, pc300chan->rx_last_bd));
 778                         }
 779                         kfree(new);
 780                         return;
 781                 }
 782
 783                 if (rx_len > CPC_TTY_MAX_MTU) {
 784                         /* Free RX descriptors */
 785                         CPC_TTY_DBG("%s: frame size is invalid.\n",cpc_tty->name);
 786                         stats->rx_errors++;
 787                         stats->rx_frame_errors++;
 788                         cpc_tty_rx_disc_frame(pc300chan);
 789                         continue;
 790                 }
 791
 792                 new = kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
 793                 if (!new) {
 794                         cpc_tty_rx_disc_frame(pc300chan);
 795                         continue;
 796                 }
 797
 798                 /* dma buf read */
 799                 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
 800                                 RX_BD_ADDR(ch, pc300chan->rx_first_bd));
 801
 802                 rx_len = 0;     /* counter frame size */
 803
 804                 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
 805                         rx_aux = cpc_readw(&ptdescr->len);
 806                         if ((status & (DST_OVR | DST_CRC | DST_RBIT |  DST_SHRT | DST_ABT))
 807                                 || (rx_aux > BD_DEF_LEN)) {
 808                                 CPC_TTY_DBG("%s: reception error\n", cpc_tty->name);
 809                                 stats->rx_errors++;
 810                                 if (status & DST_OVR) {
 811                                         stats->rx_fifo_errors++;
 812                                 }
 813                                 if (status & DST_CRC) {
 814                                         stats->rx_crc_errors++;
 815                                 }
 816                                 if ((status & (DST_RBIT | DST_SHRT | DST_ABT)) ||
 817                                         (rx_aux > BD_DEF_LEN))  {
 818                                         stats->rx_frame_errors++;
 819                                 }
 820                                 /* discard remainig descriptors used by the bad frame */
 821                                 CPC_TTY_DBG("%s: reception error - discard descriptors",
 822                                                 cpc_tty->name);
 823                                 cpc_tty_rx_disc_frame(pc300chan);
 824                                 rx_len = 0;
 825                                 kfree(new);
 826                                 new = NULL;
 827                                 break; /* read next frame - while(1) */
 828                         }
 829
 830                         if (cpc_tty->state != CPC_TTY_ST_OPEN) {
 831                                 /* Free RX descriptors */
 832                                 cpc_tty_rx_disc_frame(pc300chan);
 833                                 stats->rx_dropped++;
 834                                 rx_len = 0;
 835                                 kfree(new);
 836                                 new = NULL;
 837                                 break; /* read next frame - while(1) */
 838                         }
 839
 840                         /* read the segment of the frame */
 841                         if (rx_aux != 0) {
 842                                 memcpy_fromio((new->data + rx_len),
 843                                         (void __iomem *)(card->hw.rambase +
 844                                          cpc_readl(&ptdescr->ptbuf)), rx_aux);
 845                                 rx_len += rx_aux;
 846                         }
 847                         cpc_writeb(&ptdescr->status,0);
 848                         cpc_writeb(&ptdescr->len, 0);
 849                         pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
 850                                         (N_DMA_RX_BUF -1);
 851                         if (status & DST_EOM)break;
 852
 853                         ptdescr = (pcsca_bd_t __iomem *) (card->hw.rambase +
 854                                         cpc_readl(&ptdescr->next));
 855                 }
 856                 /* update pointer */
 857                 pc300chan->rx_last_bd = (pc300chan->rx_first_bd - 1) &
 858                                         (N_DMA_RX_BUF - 1) ;
 859                 if (!(dsr_rx & DSR_BOF)) {
 860                         /* update EDA */
 861                         cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
 862                                         RX_BD_ADDR(ch, pc300chan->rx_last_bd));
 863                 }
 864                 if (rx_len != 0) {
 865                         stats->rx_bytes += rx_len;
 866
 867                         if (pc300dev->trace_on) {
 868                                 cpc_tty_trace(pc300dev, new->data,rx_len, 'R');
 869                         }
 870                         new->size = rx_len;
 871                         new->next = NULL;
 872                         if (cpc_tty->buf_rx.first == NULL) {
 873                                 cpc_tty->buf_rx.first = new;
 874                                 cpc_tty->buf_rx.last = new;
 875                         } else {
 876                                 cpc_tty->buf_rx.last->next = new;
 877                                 cpc_tty->buf_rx.last = new;
 878                         }
 879                         schedule_work(&(cpc_tty->tty_rx_work));
 880                         stats->rx_packets++;
 881                 }
 882         }
 883 }
 884
 885 /*
 886  * PC300 TTY TX work routine
 887  *
 888  * This routine treats TX interrupt.
 889  * o if need call line discipline wakeup
 890  * o call wake_up_interruptible
 891  */
 892 static void cpc_tty_tx_work(struct work_struct *work)
 893 {
 894         st_cpc_tty_area *cpc_tty =
 895                 container_of(work, st_cpc_tty_area, tty_tx_work);
 896         struct tty_struct *tty;
 897
 898         CPC_TTY_DBG("%s: cpc_tty_tx_work init\n",cpc_tty->name);
 899
 900         if ((tty = cpc_tty->tty) == NULL) {
 901                 CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name);
 902                 return;
 903         }
 904         tty_wakeup(tty);
 905 }
 906
 907 /*
 908  * PC300 TTY send to card routine
 909  *
 910  * This routine send data to card.
 911  * o clear descriptors
 912  * o write data to DMA buffers
 913  * o start the transmission
 914  */
 915 static int cpc_tty_send_to_card(pc300dev_t *dev,void* buf, int len)
 916 {
 917         pc300ch_t *chan = (pc300ch_t *)dev->chan;
 918         pc300_t *card = (pc300_t *)chan->card;
 919         int ch = chan->channel;
 920         struct net_device_stats *stats = &dev->dev->stats;
 921         unsigned long flags;
 922         volatile pcsca_bd_t __iomem *ptdescr;
 923         int i, nchar;
 924         int tosend = len;
 925         int nbuf = ((len - 1)/BD_DEF_LEN) + 1;
 926         unsigned char *pdata=buf;
 927
 928         CPC_TTY_DBG("%s:cpc_tty_send_to_cars len=%i",
 929                         (st_cpc_tty_area *)dev->cpc_tty->name,len);
 930
 931         if (nbuf >= card->chan[ch].nfree_tx_bd) {
 932                 return 1;
 933         }
 934
 935         /* write buffer to DMA buffers */
 936         CPC_TTY_DBG("%s: call dma_buf_write\n",
 937                         (st_cpc_tty_area *)dev->cpc_tty->name);
 938         for (i = 0 ; i < nbuf ; i++) {
 939                 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
 940                         TX_BD_ADDR(ch, card->chan[ch].tx_next_bd));
 941                 nchar = (BD_DEF_LEN > tosend) ? tosend : BD_DEF_LEN;
 942                 if (cpc_readb(&ptdescr->status) & DST_OSB) {
 943                         memcpy_toio((void __iomem *)(card->hw.rambase +
 944                                 cpc_readl(&ptdescr->ptbuf)),
 945                                 &pdata[len - tosend],
 946                                 nchar);
 947                         card->chan[ch].nfree_tx_bd--;
 948                         if ((i + 1) == nbuf) {
 949                                 /* This must be the last BD to be used */
 950                                 cpc_writeb(&ptdescr->status, DST_EOM);
 951                         } else {
 952                                 cpc_writeb(&ptdescr->status, 0);
 953                         }
 954                         cpc_writew(&ptdescr->len, nchar);
 955                 } else {
 956                         CPC_TTY_DBG("%s: error in dma_buf_write\n",
 957                                         (st_cpc_tty_area *)dev->cpc_tty->name);
 958                         stats->tx_dropped++;
 959                         return 1;
 960                 }
 961                 tosend -= nchar;
 962                 card->chan[ch].tx_next_bd =
 963                         (card->chan[ch].tx_next_bd + 1) & (N_DMA_TX_BUF - 1);
 964         }
 965
 966         if (dev->trace_on) {
 967                 cpc_tty_trace(dev, buf, len,'T');
 968         }
 969
 970         /* start transmission */
 971         CPC_TTY_DBG("%s: start transmission\n",
 972                 (st_cpc_tty_area *)dev->cpc_tty->name);
 973
 974         CPC_TTY_LOCK(card, flags);
 975         cpc_writeb(card->hw.scabase + DTX_REG(EDAL, ch),
 976                         TX_BD_ADDR(ch, chan->tx_next_bd));
 977         cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_ENA);
 978         cpc_writeb(card->hw.scabase + DSR_TX(ch), DSR_DE);
 979
 980         if (card->hw.type == PC300_TE) {
 981                 cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
 982                         cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) |
 983                         (CPLD_REG2_FALC_LED1 << (2 * ch)));
 984         }
 985         CPC_TTY_UNLOCK(card, flags);
 986         return 0;
 987 }
 988
 989 /*
 990  *      PC300 TTY trace routine
 991  *
 992  *  This routine send trace of connection to application.
 993  *  o clear descriptors
 994  *  o write data to DMA buffers
 995  *  o start the transmission
 996  */
 997
 998 static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx)
 999 {
1000         struct sk_buff *skb;
1001
1002         if ((skb = dev_alloc_skb(10 + len)) == NULL) {
1003                 /* out of memory */
1004                 CPC_TTY_DBG("%s: tty_trace - out of memory\n", dev->dev->name);
1005                 return;
1006         }
1007
1008         skb_put (skb, 10 + len);
1009         skb->dev = dev->dev;
1010         skb->protocol = htons(ETH_P_CUST);
1011         skb_reset_mac_header(skb);
1012         skb->pkt_type = PACKET_HOST;
1013         skb->len = 10 + len;
1014
1015         skb_copy_to_linear_data(skb, dev->dev->name, 5);
1016         skb->data[5] = '[';
1017         skb->data[6] = rxtx;
1018         skb->data[7] = ']';
1019         skb->data[8] = ':';
1020         skb->data[9] = ' ';
1021         skb_copy_to_linear_data_offset(skb, 10, buf, len);
1022         netif_rx(skb);
1023 }
1024
1025 /*
1026  *      PC300 TTY unregister service routine
1027  *
1028  *      This routine unregister one interface.
1029  */
1030 void cpc_tty_unregister_service(pc300dev_t *pc300dev)
1031 {
1032         st_cpc_tty_area *cpc_tty;
1033         ulong flags;
1034         int res;
1035
1036         if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == NULL) {
1037                 CPC_TTY_DBG("%s: interface is not TTY\n", pc300dev->dev->name);
1038                 return;
1039         }
1040         CPC_TTY_DBG("%s: cpc_tty_unregister_service", cpc_tty->name);
1041
1042         if (cpc_tty->pc300dev != pc300dev) {
1043                 CPC_TTY_DBG("%s: invalid tty ptr=%s\n",
1044                 pc300dev->dev->name, cpc_tty->name);
1045                 return;
1046         }
1047
1048         if (--cpc_tty_cnt == 0) {
1049                 if (serial_drv.refcount) {
1050                         CPC_TTY_DBG("%s: unregister is not possible, refcount=%d",
1051                                                         cpc_tty->name, serial_drv.refcount);
1052                         cpc_tty_cnt++;
1053                         cpc_tty_unreg_flag = 1;
1054                         return;
1055                 } else {
1056                         CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
1057                         if ((res=tty_unregister_driver(&serial_drv))) {
1058                                 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
1059                                                                 cpc_tty->name,res);
1060                         }
1061                 }
1062         }
1063         CPC_TTY_LOCK(pc300dev->chan->card,flags);
1064         cpc_tty->tty = NULL;
1065         CPC_TTY_UNLOCK(pc300dev->chan->card, flags);
1066         cpc_tty->tty_minor = 0;
1067         cpc_tty->state = CPC_TTY_ST_IDLE;
1068 }
1069
1070 /*
1071  * PC300 TTY trigger poll routine
1072  * This routine is called by pc300driver to treats Tx interrupt.
1073  */
1074 void cpc_tty_trigger_poll(pc300dev_t *pc300dev)
1075 {
1076         st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
1077         if (!cpc_tty) {
1078                 return;
1079         }
1080         schedule_work(&(cpc_tty->tty_tx_work));
1081 }
1082
1083 /*
1084  * PC300 TTY reset var routine
1085  * This routine is called by pc300driver to init the TTY area.
1086  */
1087
1088 void cpc_tty_reset_var(void)
1089 {
1090         int i ;
1091
1092         CPC_TTY_DBG("hdlcX-tty: reset variables\n");
1093         /* reset  the tty_driver structure - serial_drv */
1094         memset(&serial_drv, 0, sizeof(struct tty_driver));
1095         for (i=0; i < CPC_TTY_NPORTS; i++){
1096                 memset(&cpc_tty_area[i],0, sizeof(st_cpc_tty_area));
1097         }
1098 }