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             channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 200                 *channel->board_write = 1;
 201                 wake_up_interruptible(&channel->queue);
 202         }
 203 }
 204
 205 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
 206 {
 207         u8 isr, sr;
 208         struct tty_struct *tty;
 209
 210         /* If there is no client, skip the check */
 211         if (!atomic_read(&channel->open))
 212                 return;
 213
 214         tty = tty_port_tty_get(&channel->tty_port);
 215         if (!tty)
 216                 return;
 217         /* The HW is organized in pair of channels.  See which register we need
 218          * to read from */
 219         isr = ioread8(&channel->block_regs->r.isr);
 220         sr = ioread8(&channel->regs->r.sr);
 221
 222         /* In case of RS-485, change from TX to RX when finishing TX.
 223          * Half-duplex. */
 224         if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) &&
 225             (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 226                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 227                 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 228                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 229                 *channel->board_write = 1;
 230                 wake_up_interruptible(&channel->queue);
 231         }
 232
 233         /* RX data */
 234         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 235                 ipoctal_irq_rx(channel, tty, sr);
 236
 237         /* TX of each character */
 238         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 239                 ipoctal_irq_tx(channel);
 240
 241         tty_flip_buffer_push(tty);
 242         tty_kref_put(tty);
 243 }
 244
 245 static irqreturn_t ipoctal_irq_handler(void *arg)
 246 {
 247         unsigned int i;
 248         struct ipoctal *ipoctal = (struct ipoctal *) arg;
 249
 250         /* Check all channels */
 251         for (i = 0; i < NR_CHANNELS; i++)
 252                 ipoctal_irq_channel(&ipoctal->channel[i]);
 253
 254         /* Clear the IPack device interrupt */
 255         readw(ipoctal->int_space + ACK_INT_REQ0);
 256         readw(ipoctal->int_space + ACK_INT_REQ1);
 257
 258         return IRQ_HANDLED;
 259 }
 260
 261 static const struct tty_port_operations ipoctal_tty_port_ops = {
 262         .dtr_rts = NULL,
 263         .activate = ipoctal_port_activate,
 264 };
 265
 266 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 267                              unsigned int slot)
 268 {
 269         int res;
 270         int i;
 271         struct tty_driver *tty;
 272         char name[20];
 273         struct ipoctal_channel *channel;
 274         struct ipack_region *region;
 275         void __iomem *addr;
 276         union scc2698_channel __iomem *chan_regs;
 277         union scc2698_block __iomem *block_regs;
 278
 279         ipoctal->board_id = ipoctal->dev->id_device;
 280
 281         region = &ipoctal->dev->region[IPACK_IO_SPACE];
 282         addr = devm_ioremap_nocache(&ipoctal->dev->dev,
 283                                     region->start, region->size);
 284         if (!addr) {
 285                 dev_err(&ipoctal->dev->dev,
 286                         "Unable to map slot [%d:%d] IO space!\n",
 287                         bus_nr, slot);
 288                 return -EADDRNOTAVAIL;
 289         }
 290         /* Save the virtual address to access the registers easily */
 291         chan_regs =
 292                 (union scc2698_channel __iomem *) addr;
 293         block_regs =
 294                 (union scc2698_block __iomem *) addr;
 295
 296         region = &ipoctal->dev->region[IPACK_INT_SPACE];
 297         ipoctal->int_space =
 298                 devm_ioremap_nocache(&ipoctal->dev->dev,
 299                                      region->start, region->size);
 300         if (!ipoctal->int_space) {
 301                 dev_err(&ipoctal->dev->dev,
 302                         "Unable to map slot [%d:%d] INT space!\n",
 303                         bus_nr, slot);
 304                 return -EADDRNOTAVAIL;
 305         }
 306
 307         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
 308         ipoctal->mem8_space =
 309                 devm_ioremap_nocache(&ipoctal->dev->dev,
 310                                      region->start, 0x8000);
 311         if (!addr) {
 312                 dev_err(&ipoctal->dev->dev,
 313                         "Unable to map slot [%d:%d] MEM8 space!\n",
 314                         bus_nr, slot);
 315                 return -EADDRNOTAVAIL;
 316         }
 317
 318
 319         /* Disable RX and TX before touching anything */
 320         for (i = 0; i < NR_CHANNELS ; i++) {
 321                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 322                 channel->regs = chan_regs + i;
 323                 channel->block_regs = block_regs + (i >> 1);
 324                 channel->board_write = &ipoctal->write;
 325                 channel->board_id = ipoctal->board_id;
 326                 if (i & 1) {
 327                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 328                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 329                 } else {
 330                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 331                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 332                 }
 333
 334                 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 335                 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 336                 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 337                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 338                          &channel->regs->w.mr); /* mr1 */
 339                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 340                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 341         }
 342
 343         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 344                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 345                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 346                          &block_regs[i].w.opcr);
 347                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 348                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 349                          &block_regs[i].w.imr);
 350         }
 351
 352         /*
 353          * IP-OCTAL has different addresses to copy its IRQ vector.
 354          * Depending of the carrier these addresses are accesible or not.
 355          * More info in the datasheet.
 356          */
 357         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
 358                                        ipoctal_irq_handler, ipoctal);
 359         /* Dummy write */
 360         iowrite8(1, ipoctal->mem8_space + 1);
 361
 362         /* Register the TTY device */
 363
 364         /* Each IP-OCTAL channel is a TTY port */
 365         tty = alloc_tty_driver(NR_CHANNELS);
 366
 367         if (!tty)
 368                 return -ENOMEM;
 369
 370         /* Fill struct tty_driver with ipoctal data */
 371         tty->owner = THIS_MODULE;
 372         tty->driver_name = KBUILD_MODNAME;
 373         sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
 374         tty->name = name;
 375         tty->major = 0;
 376
 377         tty->minor_start = 0;
 378         tty->type = TTY_DRIVER_TYPE_SERIAL;
 379         tty->subtype = SERIAL_TYPE_NORMAL;
 380         tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 381         tty->init_termios = tty_std_termios;
 382         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 383         tty->init_termios.c_ispeed = 9600;
 384         tty->init_termios.c_ospeed = 9600;
 385
 386         tty_set_operations(tty, &ipoctal_fops);
 387         res = tty_register_driver(tty);
 388         if (res) {
 389                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 390                 put_tty_driver(tty);
 391                 return res;
 392         }
 393
 394         /* Save struct tty_driver for use it when uninstalling the device */
 395         ipoctal->tty_drv = tty;
 396
 397         for (i = 0; i < NR_CHANNELS; i++) {
 398                 struct device *tty_dev;
 399
 400                 channel = &ipoctal->channel[i];
 401                 tty_port_init(&channel->tty_port);
 402                 tty_port_alloc_xmit_buf(&channel->tty_port);
 403                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 404
 405                 ipoctal_reset_stats(&channel->stats);
 406                 channel->nb_bytes = 0;
 407                 init_waitqueue_head(&channel->queue);
 408
 409                 spin_lock_init(&channel->lock);
 410                 channel->pointer_read = 0;
 411                 channel->pointer_write = 0;
 412                 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
 413                 if (IS_ERR(tty_dev)) {
 414                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
 415                         tty_port_destroy(&channel->tty_port);
 416                         continue;
 417                 }
 418                 dev_set_drvdata(tty_dev, channel);
 419
 420                 /*
 421                  * Enable again the RX. TX will be enabled when
 422                  * there is something to send
 423                  */
 424                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 425         }
 426
 427         return 0;
 428 }
 429
 430 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 431                                             const unsigned char *buf,
 432                                             int count)
 433 {
 434         unsigned long flags;
 435         int i;
 436         unsigned int *pointer_read = &channel->pointer_read;
 437
 438         /* Copy the bytes from the user buffer to the internal one */
 439         for (i = 0; i < count; i++) {
 440                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 441                         spin_lock_irqsave(&channel->lock, flags);
 442                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 443                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 444                         channel->nb_bytes++;
 445                         spin_unlock_irqrestore(&channel->lock, flags);
 446                 } else {
 447                         break;
 448                 }
 449         }
 450         return i;
 451 }
 452
 453 static int ipoctal_write_tty(struct tty_struct *tty,
 454                              const unsigned char *buf, int count)
 455 {
 456         struct ipoctal_channel *channel = tty->driver_data;
 457         unsigned int char_copied;
 458
 459         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
 460
 461         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 462         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 463                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 464                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 465         }
 466
 467         /*
 468          * Send a packet and then disable TX to avoid failure after several send
 469          * operations
 470          */
 471         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 472         wait_event_interruptible(channel->queue, *channel->board_write);
 473         iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 474
 475         *channel->board_write = 0;
 476         return char_copied;
 477 }
 478
 479 static int ipoctal_write_room(struct tty_struct *tty)
 480 {
 481         struct ipoctal_channel *channel = tty->driver_data;
 482
 483         return PAGE_SIZE - channel->nb_bytes;
 484 }
 485
 486 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
 487 {
 488         struct ipoctal_channel *channel = tty->driver_data;
 489
 490         return channel->nb_bytes;
 491 }
 492
 493 static void ipoctal_set_termios(struct tty_struct *tty,
 494                                 struct ktermios *old_termios)
 495 {
 496         unsigned int cflag;
 497         unsigned char mr1 = 0;
 498         unsigned char mr2 = 0;
 499         unsigned char csr = 0;
 500         struct ipoctal_channel *channel = tty->driver_data;
 501         speed_t baud;
 502
 503         cflag = tty->termios.c_cflag;
 504
 505         /* Disable and reset everything before change the setup */
 506         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 507         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 508         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 509         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 510         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 511
 512         /* Set Bits per chars */
 513         switch (cflag & CSIZE) {
 514         case CS6:
 515                 mr1 |= MR1_CHRL_6_BITS;
 516                 break;
 517         case CS7:
 518                 mr1 |= MR1_CHRL_7_BITS;
 519                 break;
 520         case CS8:
 521         default:
 522                 mr1 |= MR1_CHRL_8_BITS;
 523                 /* By default, select CS8 */
 524                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
 525                 break;
 526         }
 527
 528         /* Set Parity */
 529         if (cflag & PARENB)
 530                 if (cflag & PARODD)
 531                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 532                 else
 533                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 534         else
 535                 mr1 |= MR1_PARITY_OFF;
 536
 537         /* Mark or space parity is not supported */
 538         tty->termios.c_cflag &= ~CMSPAR;
 539
 540         /* Set stop bits */
 541         if (cflag & CSTOPB)
 542                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 543         else
 544                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 545
 546         /* Set the flow control */
 547         switch (channel->board_id) {
 548         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 549                 if (cflag & CRTSCTS) {
 550                         mr1 |= MR1_RxRTS_CONTROL_ON;
 551                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 552                 } else {
 553                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 554                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 555                 }
 556                 break;
 557         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 558                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 559                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 560                 break;
 561         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 562                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 563                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 564                 break;
 565         default:
 566                 return;
 567                 break;
 568         }
 569
 570         baud = tty_get_baud_rate(tty);
 571         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
 572
 573         /* Set baud rate */
 574         switch (baud) {
 575         case 75:
 576                 csr |= TX_CLK_75 | RX_CLK_75;
 577                 break;
 578         case 110:
 579                 csr |= TX_CLK_110 | RX_CLK_110;
 580                 break;
 581         case 150:
 582                 csr |= TX_CLK_150 | RX_CLK_150;
 583                 break;
 584         case 300:
 585                 csr |= TX_CLK_300 | RX_CLK_300;
 586                 break;
 587         case 600:
 588                 csr |= TX_CLK_600 | RX_CLK_600;
 589                 break;
 590         case 1200:
 591                 csr |= TX_CLK_1200 | RX_CLK_1200;
 592                 break;
 593         case 1800:
 594                 csr |= TX_CLK_1800 | RX_CLK_1800;
 595                 break;
 596         case 2000:
 597                 csr |= TX_CLK_2000 | RX_CLK_2000;
 598                 break;
 599         case 2400:
 600                 csr |= TX_CLK_2400 | RX_CLK_2400;
 601                 break;
 602         case 4800:
 603                 csr |= TX_CLK_4800  | RX_CLK_4800;
 604                 break;
 605         case 9600:
 606                 csr |= TX_CLK_9600  | RX_CLK_9600;
 607                 break;
 608         case 19200:
 609                 csr |= TX_CLK_19200 | RX_CLK_19200;
 610                 break;
 611         case 38400:
 612         default:
 613                 csr |= TX_CLK_38400 | RX_CLK_38400;
 614                 /* In case of default, we establish 38400 bps */
 615                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
 616                 break;
 617         }
 618
 619         mr1 |= MR1_ERROR_CHAR;
 620         mr1 |= MR1_RxINT_RxRDY;
 621
 622         /* Write the control registers */
 623         iowrite8(mr1, &channel->regs->w.mr);
 624         iowrite8(mr2, &channel->regs->w.mr);
 625         iowrite8(csr, &channel->regs->w.csr);
 626
 627         /* Enable again the RX */
 628         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 629 }
 630
 631 static void ipoctal_hangup(struct tty_struct *tty)
 632 {
 633         unsigned long flags;
 634         struct ipoctal_channel *channel = tty->driver_data;
 635
 636         if (channel == NULL)
 637                 return;
 638
 639         spin_lock_irqsave(&channel->lock, flags);
 640         channel->nb_bytes = 0;
 641         channel->pointer_read = 0;
 642         channel->pointer_write = 0;
 643         spin_unlock_irqrestore(&channel->lock, flags);
 644
 645         tty_port_hangup(&channel->tty_port);
 646
 647         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 648         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 649         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 650         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 651         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 652
 653         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 654         wake_up_interruptible(&channel->tty_port.open_wait);
 655 }
 656
 657 static const struct tty_operations ipoctal_fops = {
 658         .ioctl =                NULL,
 659         .open =                 ipoctal_open,
 660         .close =                ipoctal_close,
 661         .write =                ipoctal_write_tty,
 662         .set_termios =          ipoctal_set_termios,
 663         .write_room =           ipoctal_write_room,
 664         .chars_in_buffer =      ipoctal_chars_in_buffer,
 665         .get_icount =           ipoctal_get_icount,
 666         .hangup =               ipoctal_hangup,
 667 };
 668
 669 static int ipoctal_probe(struct ipack_device *dev)
 670 {
 671         int res;
 672         struct ipoctal *ipoctal;
 673
 674         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
 675         if (ipoctal == NULL)
 676                 return -ENOMEM;
 677
 678         ipoctal->dev = dev;
 679         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
 680         if (res)
 681                 goto out_uninst;
 682
 683         dev_set_drvdata(&dev->dev, ipoctal);
 684         return 0;
 685
 686 out_uninst:
 687         kfree(ipoctal);
 688         return res;
 689 }
 690
 691 static void __ipoctal_remove(struct ipoctal *ipoctal)
 692 {
 693         int i;
 694
 695         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
 696
 697         for (i = 0; i < NR_CHANNELS; i++) {
 698                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 699                 tty_unregister_device(ipoctal->tty_drv, i);
 700                 tty_port_free_xmit_buf(&channel->tty_port);
 701                 tty_port_destroy(&channel->tty_port);
 702         }
 703
 704         tty_unregister_driver(ipoctal->tty_drv);
 705         put_tty_driver(ipoctal->tty_drv);
 706         kfree(ipoctal);
 707 }
 708
 709 static void ipoctal_remove(struct ipack_device *idev)
 710 {
 711         __ipoctal_remove(dev_get_drvdata(&idev->dev));
 712 }
 713
 714 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
 715         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 716                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
 717         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 718                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
 719         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 720                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
 721         { 0, },
 722 };
 723
 724 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
 725
 726 static const struct ipack_driver_ops ipoctal_drv_ops = {
 727         .probe  = ipoctal_probe,
 728         .remove = ipoctal_remove,
 729 };
 730
 731 static struct ipack_driver driver = {
 732         .ops      = &ipoctal_drv_ops,
 733         .id_table = ipoctal_ids,
 734 };
 735
 736 static int __init ipoctal_init(void)
 737 {
 738         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
 739 }
 740
 741 static void __exit ipoctal_exit(void)
 742 {
 743         ipack_driver_unregister(&driver);
 744 }
 745
 746 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
 747 MODULE_LICENSE("GPL");
 748
 749 module_init(ipoctal_init);
 750 module_exit(ipoctal_exit);