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, u8 sr)
 137 {
 138         struct tty_port *port = &channel->tty_port;
 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(port, 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(port, 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(port);
 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
 212         /* If there is no client, skip the check */
 213         if (!atomic_read(&channel->open))
 214                 return;
 215
 216         /* The HW is organized in pair of channels.  See which register we need
 217          * to read from */
 218         isr = ioread8(&channel->block_regs->r.isr);
 219         sr = ioread8(&channel->regs->r.sr);
 220
 221         /* In case of RS-485, change from TX to RX when finishing TX.
 222          * Half-duplex. */
 223         if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) &&
 224             (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 225                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 226                 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 227                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 228                 *channel->board_write = 1;
 229                 wake_up_interruptible(&channel->queue);
 230         }
 231
 232         /* RX data */
 233         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 234                 ipoctal_irq_rx(channel, sr);
 235
 236         /* TX of each character */
 237         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 238                 ipoctal_irq_tx(channel);
 239
 240         tty_flip_buffer_push(&channel->tty_port);
 241 }
 242
 243 static irqreturn_t ipoctal_irq_handler(void *arg)
 244 {
 245         unsigned int i;
 246         struct ipoctal *ipoctal = (struct ipoctal *) arg;
 247
 248         /* Check all channels */
 249         for (i = 0; i < NR_CHANNELS; i++)
 250                 ipoctal_irq_channel(&ipoctal->channel[i]);
 251
 252         /* Clear the IPack device interrupt */
 253         readw(ipoctal->int_space + ACK_INT_REQ0);
 254         readw(ipoctal->int_space + ACK_INT_REQ1);
 255
 256         return IRQ_HANDLED;
 257 }
 258
 259 static const struct tty_port_operations ipoctal_tty_port_ops = {
 260         .dtr_rts = NULL,
 261         .activate = ipoctal_port_activate,
 262 };
 263
 264 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 265                              unsigned int slot)
 266 {
 267         int res;
 268         int i;
 269         struct tty_driver *tty;
 270         char name[20];
 271         struct ipoctal_channel *channel;
 272         struct ipack_region *region;
 273         void __iomem *addr;
 274         union scc2698_channel __iomem *chan_regs;
 275         union scc2698_block __iomem *block_regs;
 276
 277         ipoctal->board_id = ipoctal->dev->id_device;
 278
 279         region = &ipoctal->dev->region[IPACK_IO_SPACE];
 280         addr = devm_ioremap_nocache(&ipoctal->dev->dev,
 281                                     region->start, region->size);
 282         if (!addr) {
 283                 dev_err(&ipoctal->dev->dev,
 284                         "Unable to map slot [%d:%d] IO space!\n",
 285                         bus_nr, slot);
 286                 return -EADDRNOTAVAIL;
 287         }
 288         /* Save the virtual address to access the registers easily */
 289         chan_regs =
 290                 (union scc2698_channel __iomem *) addr;
 291         block_regs =
 292                 (union scc2698_block __iomem *) addr;
 293
 294         region = &ipoctal->dev->region[IPACK_INT_SPACE];
 295         ipoctal->int_space =
 296                 devm_ioremap_nocache(&ipoctal->dev->dev,
 297                                      region->start, region->size);
 298         if (!ipoctal->int_space) {
 299                 dev_err(&ipoctal->dev->dev,
 300                         "Unable to map slot [%d:%d] INT space!\n",
 301                         bus_nr, slot);
 302                 return -EADDRNOTAVAIL;
 303         }
 304
 305         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
 306         ipoctal->mem8_space =
 307                 devm_ioremap_nocache(&ipoctal->dev->dev,
 308                                      region->start, 0x8000);
 309         if (!addr) {
 310                 dev_err(&ipoctal->dev->dev,
 311                         "Unable to map slot [%d:%d] MEM8 space!\n",
 312                         bus_nr, slot);
 313                 return -EADDRNOTAVAIL;
 314         }
 315
 316
 317         /* Disable RX and TX before touching anything */
 318         for (i = 0; i < NR_CHANNELS ; i++) {
 319                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 320                 channel->regs = chan_regs + i;
 321                 channel->block_regs = block_regs + (i >> 1);
 322                 channel->board_write = &ipoctal->write;
 323                 channel->board_id = ipoctal->board_id;
 324                 if (i & 1) {
 325                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 326                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 327                 } else {
 328                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 329                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 330                 }
 331
 332                 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 333                 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 334                 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 335                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 336                          &channel->regs->w.mr); /* mr1 */
 337                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 338                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 339         }
 340
 341         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 342                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 343                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 344                          &block_regs[i].w.opcr);
 345                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 346                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 347                          &block_regs[i].w.imr);
 348         }
 349
 350         /*
 351          * IP-OCTAL has different addresses to copy its IRQ vector.
 352          * Depending of the carrier these addresses are accesible or not.
 353          * More info in the datasheet.
 354          */
 355         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
 356                                        ipoctal_irq_handler, ipoctal);
 357         /* Dummy write */
 358         iowrite8(1, ipoctal->mem8_space + 1);
 359
 360         /* Register the TTY device */
 361
 362         /* Each IP-OCTAL channel is a TTY port */
 363         tty = alloc_tty_driver(NR_CHANNELS);
 364
 365         if (!tty)
 366                 return -ENOMEM;
 367
 368         /* Fill struct tty_driver with ipoctal data */
 369         tty->owner = THIS_MODULE;
 370         tty->driver_name = KBUILD_MODNAME;
 371         sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
 372         tty->name = name;
 373         tty->major = 0;
 374
 375         tty->minor_start = 0;
 376         tty->type = TTY_DRIVER_TYPE_SERIAL;
 377         tty->subtype = SERIAL_TYPE_NORMAL;
 378         tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 379         tty->init_termios = tty_std_termios;
 380         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 381         tty->init_termios.c_ispeed = 9600;
 382         tty->init_termios.c_ospeed = 9600;
 383
 384         tty_set_operations(tty, &ipoctal_fops);
 385         res = tty_register_driver(tty);
 386         if (res) {
 387                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 388                 put_tty_driver(tty);
 389                 return res;
 390         }
 391
 392         /* Save struct tty_driver for use it when uninstalling the device */
 393         ipoctal->tty_drv = tty;
 394
 395         for (i = 0; i < NR_CHANNELS; i++) {
 396                 struct device *tty_dev;
 397
 398                 channel = &ipoctal->channel[i];
 399                 tty_port_init(&channel->tty_port);
 400                 tty_port_alloc_xmit_buf(&channel->tty_port);
 401                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 402
 403                 ipoctal_reset_stats(&channel->stats);
 404                 channel->nb_bytes = 0;
 405                 init_waitqueue_head(&channel->queue);
 406
 407                 spin_lock_init(&channel->lock);
 408                 channel->pointer_read = 0;
 409                 channel->pointer_write = 0;
 410                 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
 411                 if (IS_ERR(tty_dev)) {
 412                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
 413                         tty_port_destroy(&channel->tty_port);
 414                         continue;
 415                 }
 416                 dev_set_drvdata(tty_dev, channel);
 417
 418                 /*
 419                  * Enable again the RX. TX will be enabled when
 420                  * there is something to send
 421                  */
 422                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 423         }
 424
 425         return 0;
 426 }
 427
 428 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 429                                             const unsigned char *buf,
 430                                             int count)
 431 {
 432         unsigned long flags;
 433         int i;
 434         unsigned int *pointer_read = &channel->pointer_read;
 435
 436         /* Copy the bytes from the user buffer to the internal one */
 437         for (i = 0; i < count; i++) {
 438                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 439                         spin_lock_irqsave(&channel->lock, flags);
 440                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 441                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 442                         channel->nb_bytes++;
 443                         spin_unlock_irqrestore(&channel->lock, flags);
 444                 } else {
 445                         break;
 446                 }
 447         }
 448         return i;
 449 }
 450
 451 static int ipoctal_write_tty(struct tty_struct *tty,
 452                              const unsigned char *buf, int count)
 453 {
 454         struct ipoctal_channel *channel = tty->driver_data;
 455         unsigned int char_copied;
 456
 457         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
 458
 459         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 460         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 461                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 462                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 463         }
 464
 465         /*
 466          * Send a packet and then disable TX to avoid failure after several send
 467          * operations
 468          */
 469         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 470         wait_event_interruptible(channel->queue, *channel->board_write);
 471         iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 472
 473         *channel->board_write = 0;
 474         return char_copied;
 475 }
 476
 477 static int ipoctal_write_room(struct tty_struct *tty)
 478 {
 479         struct ipoctal_channel *channel = tty->driver_data;
 480
 481         return PAGE_SIZE - channel->nb_bytes;
 482 }
 483
 484 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
 485 {
 486         struct ipoctal_channel *channel = tty->driver_data;
 487
 488         return channel->nb_bytes;
 489 }
 490
 491 static void ipoctal_set_termios(struct tty_struct *tty,
 492                                 struct ktermios *old_termios)
 493 {
 494         unsigned int cflag;
 495         unsigned char mr1 = 0;
 496         unsigned char mr2 = 0;
 497         unsigned char csr = 0;
 498         struct ipoctal_channel *channel = tty->driver_data;
 499         speed_t baud;
 500
 501         cflag = tty->termios.c_cflag;
 502
 503         /* Disable and reset everything before change the setup */
 504         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 505         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 506         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 507         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 508         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 509
 510         /* Set Bits per chars */
 511         switch (cflag & CSIZE) {
 512         case CS6:
 513                 mr1 |= MR1_CHRL_6_BITS;
 514                 break;
 515         case CS7:
 516                 mr1 |= MR1_CHRL_7_BITS;
 517                 break;
 518         case CS8:
 519         default:
 520                 mr1 |= MR1_CHRL_8_BITS;
 521                 /* By default, select CS8 */
 522                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
 523                 break;
 524         }
 525
 526         /* Set Parity */
 527         if (cflag & PARENB)
 528                 if (cflag & PARODD)
 529                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 530                 else
 531                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 532         else
 533                 mr1 |= MR1_PARITY_OFF;
 534
 535         /* Mark or space parity is not supported */
 536         tty->termios.c_cflag &= ~CMSPAR;
 537
 538         /* Set stop bits */
 539         if (cflag & CSTOPB)
 540                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 541         else
 542                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 543
 544         /* Set the flow control */
 545         switch (channel->board_id) {
 546         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 547                 if (cflag & CRTSCTS) {
 548                         mr1 |= MR1_RxRTS_CONTROL_ON;
 549                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 550                 } else {
 551                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 552                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 553                 }
 554                 break;
 555         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 556                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 557                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 558                 break;
 559         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 560                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 561                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 562                 break;
 563         default:
 564                 return;
 565                 break;
 566         }
 567
 568         baud = tty_get_baud_rate(tty);
 569         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
 570
 571         /* Set baud rate */
 572         switch (baud) {
 573         case 75:
 574                 csr |= TX_CLK_75 | RX_CLK_75;
 575                 break;
 576         case 110:
 577                 csr |= TX_CLK_110 | RX_CLK_110;
 578                 break;
 579         case 150:
 580                 csr |= TX_CLK_150 | RX_CLK_150;
 581                 break;
 582         case 300:
 583                 csr |= TX_CLK_300 | RX_CLK_300;
 584                 break;
 585         case 600:
 586                 csr |= TX_CLK_600 | RX_CLK_600;
 587                 break;
 588         case 1200:
 589                 csr |= TX_CLK_1200 | RX_CLK_1200;
 590                 break;
 591         case 1800:
 592                 csr |= TX_CLK_1800 | RX_CLK_1800;
 593                 break;
 594         case 2000:
 595                 csr |= TX_CLK_2000 | RX_CLK_2000;
 596                 break;
 597         case 2400:
 598                 csr |= TX_CLK_2400 | RX_CLK_2400;
 599                 break;
 600         case 4800:
 601                 csr |= TX_CLK_4800  | RX_CLK_4800;
 602                 break;
 603         case 9600:
 604                 csr |= TX_CLK_9600  | RX_CLK_9600;
 605                 break;
 606         case 19200:
 607                 csr |= TX_CLK_19200 | RX_CLK_19200;
 608                 break;
 609         case 38400:
 610         default:
 611                 csr |= TX_CLK_38400 | RX_CLK_38400;
 612                 /* In case of default, we establish 38400 bps */
 613                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
 614                 break;
 615         }
 616
 617         mr1 |= MR1_ERROR_CHAR;
 618         mr1 |= MR1_RxINT_RxRDY;
 619
 620         /* Write the control registers */
 621         iowrite8(mr1, &channel->regs->w.mr);
 622         iowrite8(mr2, &channel->regs->w.mr);
 623         iowrite8(csr, &channel->regs->w.csr);
 624
 625         /* Enable again the RX */
 626         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 627 }
 628
 629 static void ipoctal_hangup(struct tty_struct *tty)
 630 {
 631         unsigned long flags;
 632         struct ipoctal_channel *channel = tty->driver_data;
 633
 634         if (channel == NULL)
 635                 return;
 636
 637         spin_lock_irqsave(&channel->lock, flags);
 638         channel->nb_bytes = 0;
 639         channel->pointer_read = 0;
 640         channel->pointer_write = 0;
 641         spin_unlock_irqrestore(&channel->lock, flags);
 642
 643         tty_port_hangup(&channel->tty_port);
 644
 645         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 646         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 647         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 648         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 649         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 650
 651         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 652         wake_up_interruptible(&channel->tty_port.open_wait);
 653 }
 654
 655 static const struct tty_operations ipoctal_fops = {
 656         .ioctl =                NULL,
 657         .open =                 ipoctal_open,
 658         .close =                ipoctal_close,
 659         .write =                ipoctal_write_tty,
 660         .set_termios =          ipoctal_set_termios,
 661         .write_room =           ipoctal_write_room,
 662         .chars_in_buffer =      ipoctal_chars_in_buffer,
 663         .get_icount =           ipoctal_get_icount,
 664         .hangup =               ipoctal_hangup,
 665 };
 666
 667 static int ipoctal_probe(struct ipack_device *dev)
 668 {
 669         int res;
 670         struct ipoctal *ipoctal;
 671
 672         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
 673         if (ipoctal == NULL)
 674                 return -ENOMEM;
 675
 676         ipoctal->dev = dev;
 677         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
 678         if (res)
 679                 goto out_uninst;
 680
 681         dev_set_drvdata(&dev->dev, ipoctal);
 682         return 0;
 683
 684 out_uninst:
 685         kfree(ipoctal);
 686         return res;
 687 }
 688
 689 static void __ipoctal_remove(struct ipoctal *ipoctal)
 690 {
 691         int i;
 692
 693         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
 694
 695         for (i = 0; i < NR_CHANNELS; i++) {
 696                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 697                 tty_unregister_device(ipoctal->tty_drv, i);
 698                 tty_port_free_xmit_buf(&channel->tty_port);
 699                 tty_port_destroy(&channel->tty_port);
 700         }
 701
 702         tty_unregister_driver(ipoctal->tty_drv);
 703         put_tty_driver(ipoctal->tty_drv);
 704         kfree(ipoctal);
 705 }
 706
 707 static void ipoctal_remove(struct ipack_device *idev)
 708 {
 709         __ipoctal_remove(dev_get_drvdata(&idev->dev));
 710 }
 711
 712 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
 713         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 714                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
 715         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 716                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
 717         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 718                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
 719         { 0, },
 720 };
 721
 722 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
 723
 724 static const struct ipack_driver_ops ipoctal_drv_ops = {
 725         .probe  = ipoctal_probe,
 726         .remove = ipoctal_remove,
 727 };
 728
 729 static struct ipack_driver driver = {
 730         .ops      = &ipoctal_drv_ops,
 731         .id_table = ipoctal_ids,
 732 };
 733
 734 static int __init ipoctal_init(void)
 735 {
 736         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
 737 }
 738
 739 static void __exit ipoctal_exit(void)
 740 {
 741         ipack_driver_unregister(&driver);
 742 }
 743
 744 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
 745 MODULE_LICENSE("GPL");
 746
 747 module_init(ipoctal_init);
 748 module_exit(ipoctal_exit);