drivers/staging/ipack/devices/ipoctal.c

   1 /**
   2  * ipoctal.c
   3  *
   4  * driver for the GE IP-OCTAL boards
   5  * Copyright (c) 2009 Nicolas Serafini, EIC2 SA
   6  * Copyright (c) 2010,2011 Samuel Iglesias Gonsalvez <siglesia@cern.ch>, CERN
   7  * Copyright (c) 2012 Samuel Iglesias Gonsalvez <siglesias@igalia.com>, Igalia
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the Free
  11  * Software Foundation; version 2 of the License.
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/module.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/sched.h>
  18 #include <linux/tty.h>
  19 #include <linux/serial.h>
  20 #include <linux/tty_flip.h>
  21 #include <linux/slab.h>
  22 #include <linux/atomic.h>
  23 #include <linux/io.h>
  24 #include "../ipack.h"
  25 #include "ipoctal.h"
  26 #include "scc2698.h"
  27
  28 #define IP_OCTAL_ID_SPACE_VECTOR    0x41
  29 #define IP_OCTAL_NB_BLOCKS          4
  30
  31 static const struct tty_operations ipoctal_fops;
  32
  33 struct ipoctal_channel {
  34         struct ipoctal_stats            stats;
  35         unsigned int                    nb_bytes;
  36         unsigned int                    count_wr;
  37         wait_queue_head_t               queue;
  38         spinlock_t                      lock;
  39         unsigned int                    pointer_read;
  40         unsigned int                    pointer_write;
  41         atomic_t                        open;
  42         struct tty_port                 tty_port;
  43         union scc2698_channel __iomem   *regs;
  44         union scc2698_block __iomem     *block_regs;
  45         unsigned int                    board_id;
  46         unsigned char                   *board_write;
  47         u8                              isr_rx_rdy_mask;
  48         u8                              isr_tx_rdy_mask;
  49 };
  50
  51 struct ipoctal {
  52         struct list_head                list;
  53         struct ipack_device             *dev;
  54         unsigned int                    board_id;
  55         struct ipoctal_channel          channel[NR_CHANNELS];
  56         unsigned char                   write;
  57         struct tty_driver               *tty_drv;
  58 };
  59
  60 /* Linked list to save the registered devices */
  61 static LIST_HEAD(ipoctal_list);
  62
  63 static struct ipoctal *ipoctal_find_board(struct tty_struct *tty)
  64 {
  65         struct ipoctal *p;
  66
  67         list_for_each_entry(p, &ipoctal_list, list) {
  68                 if (tty->driver->major == p->tty_drv->major)
  69                         return p;
  70         }
  71
  72         return NULL;
  73 }
  74
  75 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
  76 {
  77         struct ipoctal *ipoctal;
  78         struct ipoctal_channel *channel;
  79
  80         ipoctal = ipoctal_find_board(tty);
  81
  82         if (ipoctal == NULL) {
  83                 dev_err(tty->dev, "Device not found. Major %d\n",
  84                         tty->driver->major);
  85                 return -ENODEV;
  86         }
  87         channel = &ipoctal->channel[tty->index];
  88
  89         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
  90         return 0;
  91 }
  92
  93 static int ipoctal_open(struct tty_struct *tty, struct file *file)
  94 {
  95         int res;
  96         struct ipoctal *ipoctal;
  97         struct ipoctal_channel *channel;
  98
  99         ipoctal = ipoctal_find_board(tty);
 100
 101         if (ipoctal == NULL) {
 102                 dev_err(tty->dev, "Device not found. Major %d\n",
 103                         tty->driver->major);
 104                 return -ENODEV;
 105         }
 106         channel = &ipoctal->channel[tty->index];
 107
 108         if (atomic_read(&channel->open))
 109                 return -EBUSY;
 110
 111         tty->driver_data = channel;
 112
 113         res = tty_port_open(&channel->tty_port, tty, file);
 114         if (res)
 115                 return res;
 116
 117         atomic_inc(&channel->open);
 118         return 0;
 119 }
 120
 121 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
 122 {
 123         stats->tx = 0;
 124         stats->rx = 0;
 125         stats->rcv_break = 0;
 126         stats->framing_err = 0;
 127         stats->overrun_err = 0;
 128         stats->parity_err = 0;
 129 }
 130
 131 static void ipoctal_free_channel(struct ipoctal_channel *channel)
 132 {
 133         ipoctal_reset_stats(&channel->stats);
 134         channel->pointer_read = 0;
 135         channel->pointer_write = 0;
 136         channel->nb_bytes = 0;
 137 }
 138
 139 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
 140 {
 141         struct ipoctal_channel *channel = tty->driver_data;
 142
 143         tty_port_close(&channel->tty_port, tty, filp);
 144
 145         if (atomic_dec_and_test(&channel->open))
 146                 ipoctal_free_channel(channel);
 147 }
 148
 149 static int ipoctal_get_icount(struct tty_struct *tty,
 150                               struct serial_icounter_struct *icount)
 151 {
 152         struct ipoctal_channel *channel = tty->driver_data;
 153
 154         icount->cts = 0;
 155         icount->dsr = 0;
 156         icount->rng = 0;
 157         icount->dcd = 0;
 158         icount->rx = channel->stats.rx;
 159         icount->tx = channel->stats.tx;
 160         icount->frame = channel->stats.framing_err;
 161         icount->parity = channel->stats.parity_err;
 162         icount->brk = channel->stats.rcv_break;
 163         return 0;
 164 }
 165
 166 static void ipoctal_irq_rx(struct ipoctal_channel *channel,
 167                            struct tty_struct *tty, u8 sr)
 168 {
 169         unsigned char value = ioread8(&channel->regs->r.rhr);
 170         unsigned char flag = TTY_NORMAL;
 171
 172         /* Error: count statistics */
 173         if (sr & SR_ERROR) {
 174                 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 175
 176                 if (sr & SR_OVERRUN_ERROR) {
 177                         channel->stats.overrun_err++;
 178                         /* Overrun doesn't affect the current character*/
 179                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 180                 }
 181                 if (sr & SR_PARITY_ERROR) {
 182                         channel->stats.parity_err++;
 183                         flag = TTY_PARITY;
 184                 }
 185                 if (sr & SR_FRAMING_ERROR) {
 186                         channel->stats.framing_err++;
 187                         flag = TTY_FRAME;
 188                 }
 189                 if (sr & SR_RECEIVED_BREAK) {
 190                         channel->stats.rcv_break++;
 191                         flag = TTY_BREAK;
 192                 }
 193         }
 194
 195         tty_insert_flip_char(tty, value, flag);
 196 }
 197
 198 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
 199 {
 200         unsigned char value;
 201         unsigned int *pointer_write = &channel->pointer_write;
 202
 203         if (channel->nb_bytes <= 0) {
 204                 channel->nb_bytes = 0;
 205                 return;
 206         }
 207
 208         value = channel->tty_port.xmit_buf[*pointer_write];
 209         iowrite8(value, &channel->regs->w.thr);
 210         channel->stats.tx++;
 211         channel->count_wr++;
 212         (*pointer_write)++;
 213         *pointer_write = *pointer_write % PAGE_SIZE;
 214         channel->nb_bytes--;
 215
 216         if ((channel->nb_bytes == 0) &&
 217             (waitqueue_active(&channel->queue))) {
 218
 219                 if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 220                         *channel->board_write = 1;
 221                         wake_up_interruptible(&channel->queue);
 222                 }
 223         }
 224 }
 225
 226 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
 227 {
 228         u8 isr, sr;
 229         struct tty_struct *tty;
 230
 231         /* If there is no client, skip the check */
 232         if (!atomic_read(&channel->open))
 233                 return;
 234
 235         tty = tty_port_tty_get(&channel->tty_port);
 236         if (!tty)
 237                 return;
 238         /* The HW is organized in pair of channels.  See which register we need
 239          * to read from */
 240         isr = ioread8(&channel->block_regs->r.isr);
 241         sr = ioread8(&channel->regs->r.sr);
 242
 243         /* In case of RS-485, change from TX to RX when finishing TX.
 244          * Half-duplex. */
 245         if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) &&
 246             (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 247                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 248                 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 249                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 250                 *channel->board_write = 1;
 251                 wake_up_interruptible(&channel->queue);
 252         }
 253
 254         /* RX data */
 255         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 256                 ipoctal_irq_rx(channel, tty, sr);
 257
 258         /* TX of each character */
 259         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 260                 ipoctal_irq_tx(channel);
 261
 262         tty_flip_buffer_push(tty);
 263         tty_kref_put(tty);
 264 }
 265
 266 static irqreturn_t ipoctal_irq_handler(void *arg)
 267 {
 268         unsigned int i;
 269         struct ipoctal *ipoctal = (struct ipoctal *) arg;
 270
 271         /* Check all channels */
 272         for (i = 0; i < NR_CHANNELS; i++)
 273                 ipoctal_irq_channel(&ipoctal->channel[i]);
 274
 275         return IRQ_HANDLED;
 276 }
 277
 278 static int ipoctal_check_model(struct ipack_device *dev, unsigned char *id)
 279 {
 280         unsigned char manufacturerID;
 281         unsigned char board_id;
 282
 283
 284         manufacturerID = ioread8(dev->id_space.address + IPACK_IDPROM_OFFSET_MANUFACTURER_ID);
 285         if (manufacturerID != IPACK1_VENDOR_ID_SBS)
 286                 return -ENODEV;
 287
 288         board_id = ioread8(dev->id_space.address + IPACK_IDPROM_OFFSET_MODEL);
 289         switch (board_id) {
 290         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 291         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 292         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 293                 *id = board_id;
 294                 break;
 295         default:
 296                 return -ENODEV;
 297         }
 298
 299         return 0;
 300 }
 301
 302 static const struct tty_port_operations ipoctal_tty_port_ops = {
 303         .dtr_rts = NULL,
 304         .activate = ipoctal_port_activate,
 305 };
 306
 307 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 308                              unsigned int slot, unsigned int vector)
 309 {
 310         int res = 0;
 311         int i;
 312         struct tty_driver *tty;
 313         char name[20];
 314         unsigned char board_id;
 315         struct ipoctal_channel *channel;
 316         union scc2698_channel __iomem *chan_regs;
 317         union scc2698_block __iomem *block_regs;
 318
 319         res = ipoctal->dev->bus->ops->map_space(ipoctal->dev, 0,
 320                                                 IPACK_ID_SPACE);
 321         if (res) {
 322                 dev_err(&ipoctal->dev->dev,
 323                         "Unable to map slot [%d:%d] ID space!\n",
 324                         bus_nr, slot);
 325                 return res;
 326         }
 327
 328         res = ipoctal_check_model(ipoctal->dev, &board_id);
 329         if (res) {
 330                 ipoctal->dev->bus->ops->unmap_space(ipoctal->dev,
 331                                                     IPACK_ID_SPACE);
 332                 goto out_unregister_id_space;
 333         }
 334         ipoctal->board_id = board_id;
 335
 336         res = ipoctal->dev->bus->ops->map_space(ipoctal->dev, 0,
 337                                                 IPACK_IO_SPACE);
 338         if (res) {
 339                 dev_err(&ipoctal->dev->dev,
 340                         "Unable to map slot [%d:%d] IO space!\n",
 341                         bus_nr, slot);
 342                 goto out_unregister_id_space;
 343         }
 344
 345         res = ipoctal->dev->bus->ops->map_space(ipoctal->dev,
 346                                            0x8000, IPACK_MEM_SPACE);
 347         if (res) {
 348                 dev_err(&ipoctal->dev->dev,
 349                         "Unable to map slot [%d:%d] MEM space!\n",
 350                         bus_nr, slot);
 351                 goto out_unregister_io_space;
 352         }
 353
 354         /* Save the virtual address to access the registers easily */
 355         chan_regs =
 356                 (union scc2698_channel __iomem *) ipoctal->dev->io_space.address;
 357         block_regs =
 358                 (union scc2698_block __iomem *) ipoctal->dev->io_space.address;
 359
 360         /* Disable RX and TX before touching anything */
 361         for (i = 0; i < NR_CHANNELS ; i++) {
 362                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 363                 channel->regs = chan_regs + i;
 364                 channel->block_regs = block_regs + (i >> 1);
 365                 channel->board_write = &ipoctal->write;
 366                 channel->board_id = ipoctal->board_id;
 367                 if (i & 1) {
 368                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 369                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 370                 } else {
 371                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 372                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 373                 }
 374
 375                 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 376                 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 377                 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 378                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 379                          &channel->regs->w.mr); /* mr1 */
 380                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 381                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 382         }
 383
 384         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 385                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 386                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 387                          &block_regs[i].w.opcr);
 388                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 389                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 390                          &block_regs[i].w.imr);
 391         }
 392
 393         /*
 394          * IP-OCTAL has different addresses to copy its IRQ vector.
 395          * Depending of the carrier these addresses are accesible or not.
 396          * More info in the datasheet.
 397          */
 398         ipoctal->dev->bus->ops->request_irq(ipoctal->dev, vector,
 399                                        ipoctal_irq_handler, ipoctal);
 400         iowrite8(vector, ipoctal->dev->mem_space.address + 1);
 401
 402         /* Register the TTY device */
 403
 404         /* Each IP-OCTAL channel is a TTY port */
 405         tty = alloc_tty_driver(NR_CHANNELS);
 406
 407         if (!tty) {
 408                 res = -ENOMEM;
 409                 goto out_unregister_slot_unmap;
 410         }
 411
 412         /* Fill struct tty_driver with ipoctal data */
 413         tty->owner = THIS_MODULE;
 414         tty->driver_name = "ipoctal";
 415         sprintf(name, "ipoctal.%d.%d.", bus_nr, slot);
 416         tty->name = name;
 417         tty->major = 0;
 418
 419         tty->minor_start = 0;
 420         tty->type = TTY_DRIVER_TYPE_SERIAL;
 421         tty->subtype = SERIAL_TYPE_NORMAL;
 422         tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 423         tty->init_termios = tty_std_termios;
 424         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 425         tty->init_termios.c_ispeed = 9600;
 426         tty->init_termios.c_ospeed = 9600;
 427
 428         tty_set_operations(tty, &ipoctal_fops);
 429         res = tty_register_driver(tty);
 430         if (res) {
 431                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 432                 put_tty_driver(tty);
 433                 goto out_unregister_slot_unmap;
 434         }
 435
 436         /* Save struct tty_driver for use it when uninstalling the device */
 437         ipoctal->tty_drv = tty;
 438
 439         for (i = 0; i < NR_CHANNELS; i++) {
 440                 channel = &ipoctal->channel[i];
 441                 tty_port_init(&channel->tty_port);
 442                 tty_port_alloc_xmit_buf(&channel->tty_port);
 443                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 444
 445                 ipoctal_reset_stats(&channel->stats);
 446                 channel->nb_bytes = 0;
 447                 init_waitqueue_head(&channel->queue);
 448
 449                 spin_lock_init(&channel->lock);
 450                 channel->pointer_read = 0;
 451                 channel->pointer_write = 0;
 452                 channel->nb_bytes = 0;
 453                 tty_register_device(tty, i, NULL);
 454
 455                 /*
 456                  * Enable again the RX. TX will be enabled when
 457                  * there is something to send
 458                  */
 459                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 460         }
 461
 462         return 0;
 463
 464 out_unregister_slot_unmap:
 465         ipoctal->dev->bus->ops->unmap_space(ipoctal->dev, IPACK_ID_SPACE);
 466 out_unregister_io_space:
 467         ipoctal->dev->bus->ops->unmap_space(ipoctal->dev, IPACK_IO_SPACE);
 468 out_unregister_id_space:
 469         ipoctal->dev->bus->ops->unmap_space(ipoctal->dev, IPACK_MEM_SPACE);
 470         return res;
 471 }
 472
 473 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 474                                             const unsigned char *buf,
 475                                             int count)
 476 {
 477         unsigned long flags;
 478         int i;
 479         unsigned int *pointer_read = &channel->pointer_read;
 480
 481         /* Copy the bytes from the user buffer to the internal one */
 482         for (i = 0; i < count; i++) {
 483                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 484                         spin_lock_irqsave(&channel->lock, flags);
 485                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 486                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 487                         channel->nb_bytes++;
 488                         spin_unlock_irqrestore(&channel->lock, flags);
 489                 } else {
 490                         break;
 491                 }
 492         }
 493         return i;
 494 }
 495
 496 static int ipoctal_write_tty(struct tty_struct *tty,
 497                              const unsigned char *buf, int count)
 498 {
 499         struct ipoctal_channel *channel = tty->driver_data;
 500
 501         channel->nb_bytes = 0;
 502         channel->count_wr = 0;
 503
 504         ipoctal_copy_write_buffer(channel, buf, count);
 505
 506         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 507         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 508                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 509                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 510         }
 511
 512         /*
 513          * Send a packet and then disable TX to avoid failure after several send
 514          * operations
 515          */
 516         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 517         wait_event_interruptible(channel->queue, *channel->board_write);
 518         iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 519
 520         *channel->board_write = 0;
 521         return channel->count_wr;
 522 }
 523
 524 static int ipoctal_write_room(struct tty_struct *tty)
 525 {
 526         struct ipoctal_channel *channel = tty->driver_data;
 527
 528         return PAGE_SIZE - channel->nb_bytes;
 529 }
 530
 531 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
 532 {
 533         struct ipoctal_channel *channel = tty->driver_data;
 534
 535         return channel->nb_bytes;
 536 }
 537
 538 static void ipoctal_set_termios(struct tty_struct *tty,
 539                                 struct ktermios *old_termios)
 540 {
 541         unsigned int cflag;
 542         unsigned char mr1 = 0;
 543         unsigned char mr2 = 0;
 544         unsigned char csr = 0;
 545         struct ipoctal_channel *channel = tty->driver_data;
 546         speed_t baud;
 547
 548         cflag = tty->termios->c_cflag;
 549
 550         /* Disable and reset everything before change the setup */
 551         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 552         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 553         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 554         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 555         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 556
 557         /* Set Bits per chars */
 558         switch (cflag & CSIZE) {
 559         case CS6:
 560                 mr1 |= MR1_CHRL_6_BITS;
 561                 break;
 562         case CS7:
 563                 mr1 |= MR1_CHRL_7_BITS;
 564                 break;
 565         case CS8:
 566         default:
 567                 mr1 |= MR1_CHRL_8_BITS;
 568                 /* By default, select CS8 */
 569                 tty->termios->c_cflag = (cflag & ~CSIZE) | CS8;
 570                 break;
 571         }
 572
 573         /* Set Parity */
 574         if (cflag & PARENB)
 575                 if (cflag & PARODD)
 576                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 577                 else
 578                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 579         else
 580                 mr1 |= MR1_PARITY_OFF;
 581
 582         /* Mark or space parity is not supported */
 583         tty->termios->c_cflag &= ~CMSPAR;
 584
 585         /* Set stop bits */
 586         if (cflag & CSTOPB)
 587                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 588         else
 589                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 590
 591         /* Set the flow control */
 592         switch (channel->board_id) {
 593         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 594                 if (cflag & CRTSCTS) {
 595                         mr1 |= MR1_RxRTS_CONTROL_ON;
 596                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 597                 } else {
 598                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 599                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 600                 }
 601                 break;
 602         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 603                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 604                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 605                 break;
 606         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 607                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 608                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 609                 break;
 610         default:
 611                 return;
 612                 break;
 613         }
 614
 615         baud = tty_get_baud_rate(tty);
 616         tty_termios_encode_baud_rate(tty->termios, baud, baud);
 617
 618         /* Set baud rate */
 619         switch (tty->termios->c_ospeed) {
 620         case 75:
 621                 csr |= TX_CLK_75 | RX_CLK_75;
 622                 break;
 623         case 110:
 624                 csr |= TX_CLK_110 | RX_CLK_110;
 625                 break;
 626         case 150:
 627                 csr |= TX_CLK_150 | RX_CLK_150;
 628                 break;
 629         case 300:
 630                 csr |= TX_CLK_300 | RX_CLK_300;
 631                 break;
 632         case 600:
 633                 csr |= TX_CLK_600 | RX_CLK_600;
 634                 break;
 635         case 1200:
 636                 csr |= TX_CLK_1200 | RX_CLK_1200;
 637                 break;
 638         case 1800:
 639                 csr |= TX_CLK_1800 | RX_CLK_1800;
 640                 break;
 641         case 2000:
 642                 csr |= TX_CLK_2000 | RX_CLK_2000;
 643                 break;
 644         case 2400:
 645                 csr |= TX_CLK_2400 | RX_CLK_2400;
 646                 break;
 647         case 4800:
 648                 csr |= TX_CLK_4800  | RX_CLK_4800;
 649                 break;
 650         case 9600:
 651                 csr |= TX_CLK_9600  | RX_CLK_9600;
 652                 break;
 653         case 19200:
 654                 csr |= TX_CLK_19200 | RX_CLK_19200;
 655                 break;
 656         case 38400:
 657         default:
 658                 csr |= TX_CLK_38400 | RX_CLK_38400;
 659                 /* In case of default, we establish 38400 bps */
 660                 tty_termios_encode_baud_rate(tty->termios, 38400, 38400);
 661                 break;
 662         }
 663
 664         mr1 |= MR1_ERROR_CHAR;
 665         mr1 |= MR1_RxINT_RxRDY;
 666
 667         /* Write the control registers */
 668         iowrite8(mr1, &channel->regs->w.mr);
 669         iowrite8(mr2, &channel->regs->w.mr);
 670         iowrite8(csr, &channel->regs->w.csr);
 671
 672         /* Enable again the RX */
 673         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 674 }
 675
 676 static void ipoctal_hangup(struct tty_struct *tty)
 677 {
 678         unsigned long flags;
 679         struct ipoctal_channel *channel = tty->driver_data;
 680
 681         if (channel == NULL)
 682                 return;
 683
 684         spin_lock_irqsave(&channel->lock, flags);
 685         channel->nb_bytes = 0;
 686         channel->pointer_read = 0;
 687         channel->pointer_write = 0;
 688         spin_unlock_irqrestore(&channel->lock, flags);
 689
 690         tty_port_hangup(&channel->tty_port);
 691
 692         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 693         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 694         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 695         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 696         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 697
 698         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 699         wake_up_interruptible(&channel->tty_port.open_wait);
 700 }
 701
 702 static const struct tty_operations ipoctal_fops = {
 703         .ioctl =                NULL,
 704         .open =                 ipoctal_open,
 705         .close =                ipoctal_close,
 706         .write =                ipoctal_write_tty,
 707         .set_termios =          ipoctal_set_termios,
 708         .write_room =           ipoctal_write_room,
 709         .chars_in_buffer =      ipoctal_chars_in_buffer,
 710         .get_icount =           ipoctal_get_icount,
 711         .hangup =               ipoctal_hangup,
 712 };
 713
 714 static int ipoctal_probe(struct ipack_device *dev)
 715 {
 716         int res;
 717         struct ipoctal *ipoctal;
 718
 719         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
 720         if (ipoctal == NULL)
 721                 return -ENOMEM;
 722
 723         ipoctal->dev = dev;
 724         res = ipoctal_inst_slot(ipoctal, dev->bus_nr, dev->slot, dev->irq);
 725         if (res)
 726                 goto out_uninst;
 727
 728         list_add_tail(&ipoctal->list, &ipoctal_list);
 729         return 0;
 730
 731 out_uninst:
 732         kfree(ipoctal);
 733         return res;
 734 }
 735
 736 static void __ipoctal_remove(struct ipoctal *ipoctal)
 737 {
 738         int i;
 739
 740         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
 741
 742         for (i = 0; i < NR_CHANNELS; i++) {
 743                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 744                 tty_unregister_device(ipoctal->tty_drv, i);
 745                 tty_port_free_xmit_buf(&channel->tty_port);
 746         }
 747
 748         tty_unregister_driver(ipoctal->tty_drv);
 749         put_tty_driver(ipoctal->tty_drv);
 750         list_del(&ipoctal->list);
 751         kfree(ipoctal);
 752 }
 753
 754 static void ipoctal_remove(struct ipack_device *device)
 755 {
 756         struct ipoctal *ipoctal, *next;
 757
 758         list_for_each_entry_safe(ipoctal, next, &ipoctal_list, list) {
 759                 if (ipoctal->dev == device)
 760                         __ipoctal_remove(ipoctal);
 761         }
 762 }
 763
 764 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
 765         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 766                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
 767         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 768                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
 769         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 770                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
 771         { 0, },
 772 };
 773
 774 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
 775
 776 static const struct ipack_driver_ops ipoctal_drv_ops = {
 777         .probe  = ipoctal_probe,
 778         .remove = ipoctal_remove,
 779 };
 780
 781 static struct ipack_driver driver = {
 782         .ops      = &ipoctal_drv_ops,
 783         .id_table = ipoctal_ids,
 784 };
 785
 786 static int __init ipoctal_init(void)
 787 {
 788         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
 789 }
 790
 791 static void __exit ipoctal_exit(void)
 792 {
 793         ipack_driver_unregister(&driver);
 794 }
 795
 796 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
 797 MODULE_LICENSE("GPL");
 798
 799 module_init(ipoctal_init);
 800 module_exit(ipoctal_exit);