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