drivers/ipack/devices/ipoctal.c

   1 /**
   2  * ipoctal.c
   3  *
   4  * driver for the GE IP-OCTAL boards
   5  *
   6  * Copyright (C) 2009-2012 CERN (www.cern.ch)
   7  * Author: Nicolas Serafini, EIC2 SA
   8  * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; version 2 of the License.
  13  */
  14
  15 #include <linux/device.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/sched.h>
  19 #include <linux/tty.h>
  20 #include <linux/serial.h>
  21 #include <linux/tty_flip.h>
  22 #include <linux/slab.h>
  23 #include <linux/atomic.h>
  24 #include <linux/io.h>
  25 #include <linux/ipack.h>
  26 #include "ipoctal.h"
  27 #include "scc2698.h"
  28
  29 #define IP_OCTAL_ID_SPACE_VECTOR    0x41
  30 #define IP_OCTAL_NB_BLOCKS          4
  31
  32 static const struct tty_operations ipoctal_fops;
  33
  34 struct ipoctal_channel {
  35         struct ipoctal_stats            stats;
  36         unsigned int                    nb_bytes;
  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 ipack_device             *dev;
  53         unsigned int                    board_id;
  54         struct ipoctal_channel          channel[NR_CHANNELS];
  55         unsigned char                   write;
  56         struct tty_driver               *tty_drv;
  57         u8 __iomem                      *mem8_space;
  58         u8 __iomem                      *int_space;
  59 };
  60
  61 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
  62 {
  63         struct ipoctal_channel *channel;
  64
  65         channel = dev_get_drvdata(tty->dev);
  66
  67         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
  68         return 0;
  69 }
  70
  71 static int ipoctal_open(struct tty_struct *tty, struct file *file)
  72 {
  73         int res;
  74         struct ipoctal_channel *channel;
  75
  76         channel = dev_get_drvdata(tty->dev);
  77
  78         if (atomic_read(&channel->open))
  79                 return -EBUSY;
  80
  81         tty->driver_data = channel;
  82
  83         res = tty_port_open(&channel->tty_port, tty, file);
  84         if (res)
  85                 return res;
  86
  87         atomic_inc(&channel->open);
  88         return 0;
  89 }
  90
  91 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
  92 {
  93         stats->tx = 0;
  94         stats->rx = 0;
  95         stats->rcv_break = 0;
  96         stats->framing_err = 0;
  97         stats->overrun_err = 0;
  98         stats->parity_err = 0;
  99 }
 100
 101 static void ipoctal_free_channel(struct ipoctal_channel *channel)
 102 {
 103         ipoctal_reset_stats(&channel->stats);
 104         channel->pointer_read = 0;
 105         channel->pointer_write = 0;
 106         channel->nb_bytes = 0;
 107 }
 108
 109 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
 110 {
 111         struct ipoctal_channel *channel = tty->driver_data;
 112
 113         tty_port_close(&channel->tty_port, tty, filp);
 114
 115         if (atomic_dec_and_test(&channel->open))
 116                 ipoctal_free_channel(channel);
 117 }
 118
 119 static int ipoctal_get_icount(struct tty_struct *tty,
 120                               struct serial_icounter_struct *icount)
 121 {
 122         struct ipoctal_channel *channel = tty->driver_data;
 123
 124         icount->cts = 0;
 125         icount->dsr = 0;
 126         icount->rng = 0;
 127         icount->dcd = 0;
 128         icount->rx = channel->stats.rx;
 129         icount->tx = channel->stats.tx;
 130         icount->frame = channel->stats.framing_err;
 131         icount->parity = channel->stats.parity_err;
 132         icount->brk = channel->stats.rcv_break;
 133         return 0;
 134 }
 135
 136 static void ipoctal_irq_rx(struct ipoctal_channel *channel,
 137                            struct tty_struct *tty, u8 sr)
 138 {
 139         unsigned char value;
 140         unsigned char flag = TTY_NORMAL;
 141         u8 isr;
 142
 143         do {
 144                 value = ioread8(&channel->regs->r.rhr);
 145                 /* Error: count statistics */
 146                 if (sr & SR_ERROR) {
 147                         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 148
 149                         if (sr & SR_OVERRUN_ERROR) {
 150                                 channel->stats.overrun_err++;
 151                                 /* Overrun doesn't affect the current character*/
 152                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 153                         }
 154                         if (sr & SR_PARITY_ERROR) {
 155                                 channel->stats.parity_err++;
 156                                 flag = TTY_PARITY;
 157                         }
 158                         if (sr & SR_FRAMING_ERROR) {
 159                                 channel->stats.framing_err++;
 160                                 flag = TTY_FRAME;
 161                         }
 162                         if (sr & SR_RECEIVED_BREAK) {
 163                                 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
 164                                 channel->stats.rcv_break++;
 165                                 flag = TTY_BREAK;
 166                         }
 167                 }
 168                 tty_insert_flip_char(tty, value, flag);
 169
 170                 /* Check if there are more characters in RX FIFO
 171                  * If there are more, the isr register for this channel
 172                  * has enabled the RxRDY|FFULL bit.
 173                  */
 174                 isr = ioread8(&channel->block_regs->r.isr);
 175                 sr = ioread8(&channel->regs->r.sr);
 176         } while (isr & channel->isr_rx_rdy_mask);
 177
 178         tty_flip_buffer_push(tty);
 179 }
 180
 181 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
 182 {
 183         unsigned char value;
 184         unsigned int *pointer_write = &channel->pointer_write;
 185
 186         if (channel->nb_bytes <= 0) {
 187                 channel->nb_bytes = 0;
 188                 return;
 189         }
 190
 191         value = channel->tty_port.xmit_buf[*pointer_write];
 192         iowrite8(value, &channel->regs->w.thr);
 193         channel->stats.tx++;
 194         (*pointer_write)++;
 195         *pointer_write = *pointer_write % PAGE_SIZE;
 196         channel->nb_bytes--;
 197
 198         if ((channel->nb_bytes == 0) &&
 199             (waitqueue_active(&channel->queue))) {
 200
 201                 if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 202                         *channel->board_write = 1;
 203                         wake_up_interruptible(&channel->queue);
 204                 }
 205         }
 206 }
 207
 208 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
 209 {
 210         u8 isr, sr;
 211         struct tty_struct *tty;
 212
 213         /* If there is no client, skip the check */
 214         if (!atomic_read(&channel->open))
 215                 return;
 216
 217         tty = tty_port_tty_get(&channel->tty_port);
 218         if (!tty)
 219                 return;
 220         /* The HW is organized in pair of channels.  See which register we need
 221          * to read from */
 222         isr = ioread8(&channel->block_regs->r.isr);
 223         sr = ioread8(&channel->regs->r.sr);
 224
 225         /* In case of RS-485, change from TX to RX when finishing TX.
 226          * Half-duplex. */
 227         if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) &&
 228             (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 229                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 230                 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 231                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 232                 *channel->board_write = 1;
 233                 wake_up_interruptible(&channel->queue);
 234         }
 235
 236         /* RX data */
 237         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 238                 ipoctal_irq_rx(channel, tty, sr);
 239
 240         /* TX of each character */
 241         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 242                 ipoctal_irq_tx(channel);
 243
 244         tty_flip_buffer_push(tty);
 245         tty_kref_put(tty);
 246 }
 247
 248 static irqreturn_t ipoctal_irq_handler(void *arg)
 249 {
 250         unsigned int i;
 251         struct ipoctal *ipoctal = (struct ipoctal *) arg;
 252
 253         /* Check all channels */
 254         for (i = 0; i < NR_CHANNELS; i++)
 255                 ipoctal_irq_channel(&ipoctal->channel[i]);
 256
 257         /* Clear the IPack device interrupt */
 258         readw(ipoctal->int_space + ACK_INT_REQ0);
 259         readw(ipoctal->int_space + ACK_INT_REQ1);
 260
 261         return IRQ_HANDLED;
 262 }
 263
 264 static const struct tty_port_operations ipoctal_tty_port_ops = {
 265         .dtr_rts = NULL,
 266         .activate = ipoctal_port_activate,
 267 };
 268
 269 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 270                              unsigned int slot)
 271 {
 272         int res;
 273         int i;
 274         struct tty_driver *tty;
 275         char name[20];
 276         struct ipoctal_channel *channel;
 277         struct ipack_region *region;
 278         void __iomem *addr;
 279         union scc2698_channel __iomem *chan_regs;
 280         union scc2698_block __iomem *block_regs;
 281
 282         ipoctal->board_id = ipoctal->dev->id_device;
 283
 284         region = &ipoctal->dev->region[IPACK_IO_SPACE];
 285         addr = devm_ioremap_nocache(&ipoctal->dev->dev,
 286                                     region->start, region->size);
 287         if (!addr) {
 288                 dev_err(&ipoctal->dev->dev,
 289                         "Unable to map slot [%d:%d] IO space!\n",
 290                         bus_nr, slot);
 291                 return -EADDRNOTAVAIL;
 292         }
 293         /* Save the virtual address to access the registers easily */
 294         chan_regs =
 295                 (union scc2698_channel __iomem *) addr;
 296         block_regs =
 297                 (union scc2698_block __iomem *) addr;
 298
 299         region = &ipoctal->dev->region[IPACK_INT_SPACE];
 300         ipoctal->int_space =
 301                 devm_ioremap_nocache(&ipoctal->dev->dev,
 302                                      region->start, region->size);
 303         if (!ipoctal->int_space) {
 304                 dev_err(&ipoctal->dev->dev,
 305                         "Unable to map slot [%d:%d] INT space!\n",
 306                         bus_nr, slot);
 307                 return -EADDRNOTAVAIL;
 308         }
 309
 310         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
 311         ipoctal->mem8_space =
 312                 devm_ioremap_nocache(&ipoctal->dev->dev,
 313                                      region->start, 0x8000);
 314         if (!addr) {
 315                 dev_err(&ipoctal->dev->dev,
 316                         "Unable to map slot [%d:%d] MEM8 space!\n",
 317                         bus_nr, slot);
 318                 return -EADDRNOTAVAIL;
 319         }
 320
 321
 322         /* Disable RX and TX before touching anything */
 323         for (i = 0; i < NR_CHANNELS ; i++) {
 324                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 325                 channel->regs = chan_regs + i;
 326                 channel->block_regs = block_regs + (i >> 1);
 327                 channel->board_write = &ipoctal->write;
 328                 channel->board_id = ipoctal->board_id;
 329                 if (i & 1) {
 330                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 331                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 332                 } else {
 333                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 334                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 335                 }
 336
 337                 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 338                 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 339                 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 340                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 341                          &channel->regs->w.mr); /* mr1 */
 342                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 343                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 344         }
 345
 346         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 347                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 348                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 349                          &block_regs[i].w.opcr);
 350                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 351                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 352                          &block_regs[i].w.imr);
 353         }
 354
 355         /*
 356          * IP-OCTAL has different addresses to copy its IRQ vector.
 357          * Depending of the carrier these addresses are accesible or not.
 358          * More info in the datasheet.
 359          */
 360         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
 361                                        ipoctal_irq_handler, ipoctal);
 362         /* Dummy write */
 363         iowrite8(1, ipoctal->mem8_space + 1);
 364
 365         /* Register the TTY device */
 366
 367         /* Each IP-OCTAL channel is a TTY port */
 368         tty = alloc_tty_driver(NR_CHANNELS);
 369
 370         if (!tty)
 371                 return -ENOMEM;
 372
 373         /* Fill struct tty_driver with ipoctal data */
 374         tty->owner = THIS_MODULE;
 375         tty->driver_name = KBUILD_MODNAME;
 376         sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
 377         tty->name = name;
 378         tty->major = 0;
 379
 380         tty->minor_start = 0;
 381         tty->type = TTY_DRIVER_TYPE_SERIAL;
 382         tty->subtype = SERIAL_TYPE_NORMAL;
 383         tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 384         tty->init_termios = tty_std_termios;
 385         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 386         tty->init_termios.c_ispeed = 9600;
 387         tty->init_termios.c_ospeed = 9600;
 388
 389         tty_set_operations(tty, &ipoctal_fops);
 390         res = tty_register_driver(tty);
 391         if (res) {
 392                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 393                 put_tty_driver(tty);
 394                 return res;
 395         }
 396
 397         /* Save struct tty_driver for use it when uninstalling the device */
 398         ipoctal->tty_drv = tty;
 399
 400         for (i = 0; i < NR_CHANNELS; i++) {
 401                 struct device *tty_dev;
 402
 403                 channel = &ipoctal->channel[i];
 404                 tty_port_init(&channel->tty_port);
 405                 tty_port_alloc_xmit_buf(&channel->tty_port);
 406                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 407
 408                 ipoctal_reset_stats(&channel->stats);
 409                 channel->nb_bytes = 0;
 410                 init_waitqueue_head(&channel->queue);
 411
 412                 spin_lock_init(&channel->lock);
 413                 channel->pointer_read = 0;
 414                 channel->pointer_write = 0;
 415                 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
 416                 if (IS_ERR(tty_dev)) {
 417                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
 418                         tty_port_destroy(&channel->tty_port);
 419                         continue;
 420                 }
 421                 dev_set_drvdata(tty_dev, channel);
 422
 423                 /*
 424                  * Enable again the RX. TX will be enabled when
 425                  * there is something to send
 426                  */
 427                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 428         }
 429
 430         return 0;
 431 }
 432
 433 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 434                                             const unsigned char *buf,
 435                                             int count)
 436 {
 437         unsigned long flags;
 438         int i;
 439         unsigned int *pointer_read = &channel->pointer_read;
 440
 441         /* Copy the bytes from the user buffer to the internal one */
 442         for (i = 0; i < count; i++) {
 443                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 444                         spin_lock_irqsave(&channel->lock, flags);
 445                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 446                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 447                         channel->nb_bytes++;
 448                         spin_unlock_irqrestore(&channel->lock, flags);
 449                 } else {
 450                         break;
 451                 }
 452         }
 453         return i;
 454 }
 455
 456 static int ipoctal_write_tty(struct tty_struct *tty,
 457                              const unsigned char *buf, int count)
 458 {
 459         struct ipoctal_channel *channel = tty->driver_data;
 460         unsigned int char_copied;
 461
 462         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
 463
 464         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 465         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 466                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 467                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 468         }
 469
 470         /*
 471          * Send a packet and then disable TX to avoid failure after several send
 472          * operations
 473          */
 474         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 475         wait_event_interruptible(channel->queue, *channel->board_write);
 476         iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 477
 478         *channel->board_write = 0;
 479         return char_copied;
 480 }
 481
 482 static int ipoctal_write_room(struct tty_struct *tty)
 483 {
 484         struct ipoctal_channel *channel = tty->driver_data;
 485
 486         return PAGE_SIZE - channel->nb_bytes;
 487 }
 488
 489 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
 490 {
 491         struct ipoctal_channel *channel = tty->driver_data;
 492
 493         return channel->nb_bytes;
 494 }
 495
 496 static void ipoctal_set_termios(struct tty_struct *tty,
 497                                 struct ktermios *old_termios)
 498 {
 499         unsigned int cflag;
 500         unsigned char mr1 = 0;
 501         unsigned char mr2 = 0;
 502         unsigned char csr = 0;
 503         struct ipoctal_channel *channel = tty->driver_data;
 504         speed_t baud;
 505
 506         cflag = tty->termios.c_cflag;
 507
 508         /* Disable and reset everything before change the setup */
 509         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 510         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 511         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 512         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 513         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 514
 515         /* Set Bits per chars */
 516         switch (cflag & CSIZE) {
 517         case CS6:
 518                 mr1 |= MR1_CHRL_6_BITS;
 519                 break;
 520         case CS7:
 521                 mr1 |= MR1_CHRL_7_BITS;
 522                 break;
 523         case CS8:
 524         default:
 525                 mr1 |= MR1_CHRL_8_BITS;
 526                 /* By default, select CS8 */
 527                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
 528                 break;
 529         }
 530
 531         /* Set Parity */
 532         if (cflag & PARENB)
 533                 if (cflag & PARODD)
 534                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 535                 else
 536                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 537         else
 538                 mr1 |= MR1_PARITY_OFF;
 539
 540         /* Mark or space parity is not supported */
 541         tty->termios.c_cflag &= ~CMSPAR;
 542
 543         /* Set stop bits */
 544         if (cflag & CSTOPB)
 545                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 546         else
 547                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 548
 549         /* Set the flow control */
 550         switch (channel->board_id) {
 551         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 552                 if (cflag & CRTSCTS) {
 553                         mr1 |= MR1_RxRTS_CONTROL_ON;
 554                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 555                 } else {
 556                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 557                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 558                 }
 559                 break;
 560         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 561                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 562                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 563                 break;
 564         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 565                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 566                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 567                 break;
 568         default:
 569                 return;
 570                 break;
 571         }
 572
 573         baud = tty_get_baud_rate(tty);
 574         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
 575
 576         /* Set baud rate */
 577         switch (baud) {
 578         case 75:
 579                 csr |= TX_CLK_75 | RX_CLK_75;
 580                 break;
 581         case 110:
 582                 csr |= TX_CLK_110 | RX_CLK_110;
 583                 break;
 584         case 150:
 585                 csr |= TX_CLK_150 | RX_CLK_150;
 586                 break;
 587         case 300:
 588                 csr |= TX_CLK_300 | RX_CLK_300;
 589                 break;
 590         case 600:
 591                 csr |= TX_CLK_600 | RX_CLK_600;
 592                 break;
 593         case 1200:
 594                 csr |= TX_CLK_1200 | RX_CLK_1200;
 595                 break;
 596         case 1800:
 597                 csr |= TX_CLK_1800 | RX_CLK_1800;
 598                 break;
 599         case 2000:
 600                 csr |= TX_CLK_2000 | RX_CLK_2000;
 601                 break;
 602         case 2400:
 603                 csr |= TX_CLK_2400 | RX_CLK_2400;
 604                 break;
 605         case 4800:
 606                 csr |= TX_CLK_4800  | RX_CLK_4800;
 607                 break;
 608         case 9600:
 609                 csr |= TX_CLK_9600  | RX_CLK_9600;
 610                 break;
 611         case 19200:
 612                 csr |= TX_CLK_19200 | RX_CLK_19200;
 613                 break;
 614         case 38400:
 615         default:
 616                 csr |= TX_CLK_38400 | RX_CLK_38400;
 617                 /* In case of default, we establish 38400 bps */
 618                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
 619                 break;
 620         }
 621
 622         mr1 |= MR1_ERROR_CHAR;
 623         mr1 |= MR1_RxINT_RxRDY;
 624
 625         /* Write the control registers */
 626         iowrite8(mr1, &channel->regs->w.mr);
 627         iowrite8(mr2, &channel->regs->w.mr);
 628         iowrite8(csr, &channel->regs->w.csr);
 629
 630         /* Enable again the RX */
 631         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 632 }
 633
 634 static void ipoctal_hangup(struct tty_struct *tty)
 635 {
 636         unsigned long flags;
 637         struct ipoctal_channel *channel = tty->driver_data;
 638
 639         if (channel == NULL)
 640                 return;
 641
 642         spin_lock_irqsave(&channel->lock, flags);
 643         channel->nb_bytes = 0;
 644         channel->pointer_read = 0;
 645         channel->pointer_write = 0;
 646         spin_unlock_irqrestore(&channel->lock, flags);
 647
 648         tty_port_hangup(&channel->tty_port);
 649
 650         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 651         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 652         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 653         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 654         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 655
 656         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 657         wake_up_interruptible(&channel->tty_port.open_wait);
 658 }
 659
 660 static const struct tty_operations ipoctal_fops = {
 661         .ioctl =                NULL,
 662         .open =                 ipoctal_open,
 663         .close =                ipoctal_close,
 664         .write =                ipoctal_write_tty,
 665         .set_termios =          ipoctal_set_termios,
 666         .write_room =           ipoctal_write_room,
 667         .chars_in_buffer =      ipoctal_chars_in_buffer,
 668         .get_icount =           ipoctal_get_icount,
 669         .hangup =               ipoctal_hangup,
 670 };
 671
 672 static int ipoctal_probe(struct ipack_device *dev)
 673 {
 674         int res;
 675         struct ipoctal *ipoctal;
 676
 677         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
 678         if (ipoctal == NULL)
 679                 return -ENOMEM;
 680
 681         ipoctal->dev = dev;
 682         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
 683         if (res)
 684                 goto out_uninst;
 685
 686         dev_set_drvdata(&dev->dev, ipoctal);
 687         return 0;
 688
 689 out_uninst:
 690         kfree(ipoctal);
 691         return res;
 692 }
 693
 694 static void __ipoctal_remove(struct ipoctal *ipoctal)
 695 {
 696         int i;
 697
 698         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
 699
 700         for (i = 0; i < NR_CHANNELS; i++) {
 701                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 702                 tty_unregister_device(ipoctal->tty_drv, i);
 703                 tty_port_free_xmit_buf(&channel->tty_port);
 704                 tty_port_destroy(&channel->tty_port);
 705         }
 706
 707         tty_unregister_driver(ipoctal->tty_drv);
 708         put_tty_driver(ipoctal->tty_drv);
 709         kfree(ipoctal);
 710 }
 711
 712 static void ipoctal_remove(struct ipack_device *idev)
 713 {
 714         __ipoctal_remove(dev_get_drvdata(&idev->dev));
 715 }
 716
 717 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
 718         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 719                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
 720         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 721                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
 722         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 723                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
 724         { 0, },
 725 };
 726
 727 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
 728
 729 static const struct ipack_driver_ops ipoctal_drv_ops = {
 730         .probe  = ipoctal_probe,
 731         .remove = ipoctal_remove,
 732 };
 733
 734 static struct ipack_driver driver = {
 735         .ops      = &ipoctal_drv_ops,
 736         .id_table = ipoctal_ids,
 737 };
 738
 739 static int __init ipoctal_init(void)
 740 {
 741         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
 742 }
 743
 744 static void __exit ipoctal_exit(void)
 745 {
 746         ipack_driver_unregister(&driver);
 747 }
 748
 749 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
 750 MODULE_LICENSE("GPL");
 751
 752 module_init(ipoctal_init);
 753 module_exit(ipoctal_exit);