drivers/ipack/devices/ipoctal.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * driver for the GE IP-OCTAL boards
   4  *
   5  * Copyright (C) 2009-2012 CERN (www.cern.ch)
   6  * Author: Nicolas Serafini, EIC2 SA
   7  * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/module.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/sched.h>
  14 #include <linux/tty.h>
  15 #include <linux/serial.h>
  16 #include <linux/tty_flip.h>
  17 #include <linux/slab.h>
  18 #include <linux/io.h>
  19 #include <linux/ipack.h>
  20 #include "ipoctal.h"
  21 #include "scc2698.h"
  22
  23 #define IP_OCTAL_ID_SPACE_VECTOR    0x41
  24 #define IP_OCTAL_NB_BLOCKS          4
  25
  26 static const struct tty_operations ipoctal_fops;
  27
  28 struct ipoctal_channel {
  29         struct ipoctal_stats            stats;
  30         unsigned int                    nb_bytes;
  31         wait_queue_head_t               queue;
  32         spinlock_t                      lock;
  33         unsigned int                    pointer_read;
  34         unsigned int                    pointer_write;
  35         struct tty_port                 tty_port;
  36         union scc2698_channel __iomem   *regs;
  37         union scc2698_block __iomem     *block_regs;
  38         unsigned int                    board_id;
  39         u8                              isr_rx_rdy_mask;
  40         u8                              isr_tx_rdy_mask;
  41         unsigned int                    rx_enable;
  42 };
  43
  44 struct ipoctal {
  45         struct ipack_device             *dev;
  46         unsigned int                    board_id;
  47         struct ipoctal_channel          channel[NR_CHANNELS];
  48         struct tty_driver               *tty_drv;
  49         u8 __iomem                      *mem8_space;
  50         u8 __iomem                      *int_space;
  51 };
  52
  53 static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
  54                                               unsigned int index)
  55 {
  56         return container_of(chan, struct ipoctal, channel[index]);
  57 }
  58
  59 static void ipoctal_reset_channel(struct ipoctal_channel *channel)
  60 {
  61         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
  62         channel->rx_enable = 0;
  63         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
  64         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
  65         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
  66         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
  67 }
  68
  69 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
  70 {
  71         struct ipoctal_channel *channel;
  72
  73         channel = dev_get_drvdata(tty->dev);
  74
  75         /*
  76          * Enable RX. TX will be enabled when
  77          * there is something to send
  78          */
  79         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
  80         channel->rx_enable = 1;
  81         return 0;
  82 }
  83
  84 static int ipoctal_open(struct tty_struct *tty, struct file *file)
  85 {
  86         struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
  87         struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
  88         int err;
  89
  90         tty->driver_data = channel;
  91
  92         if (!ipack_get_carrier(ipoctal->dev))
  93                 return -EBUSY;
  94
  95         err = tty_port_open(&channel->tty_port, tty, file);
  96         if (err)
  97                 ipack_put_carrier(ipoctal->dev);
  98
  99         return err;
 100 }
 101
 102 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
 103 {
 104         stats->tx = 0;
 105         stats->rx = 0;
 106         stats->rcv_break = 0;
 107         stats->framing_err = 0;
 108         stats->overrun_err = 0;
 109         stats->parity_err = 0;
 110 }
 111
 112 static void ipoctal_free_channel(struct ipoctal_channel *channel)
 113 {
 114         ipoctal_reset_stats(&channel->stats);
 115         channel->pointer_read = 0;
 116         channel->pointer_write = 0;
 117         channel->nb_bytes = 0;
 118 }
 119
 120 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
 121 {
 122         struct ipoctal_channel *channel = tty->driver_data;
 123
 124         tty_port_close(&channel->tty_port, tty, filp);
 125         ipoctal_free_channel(channel);
 126 }
 127
 128 static int ipoctal_get_icount(struct tty_struct *tty,
 129                               struct serial_icounter_struct *icount)
 130 {
 131         struct ipoctal_channel *channel = tty->driver_data;
 132
 133         icount->cts = 0;
 134         icount->dsr = 0;
 135         icount->rng = 0;
 136         icount->dcd = 0;
 137         icount->rx = channel->stats.rx;
 138         icount->tx = channel->stats.tx;
 139         icount->frame = channel->stats.framing_err;
 140         icount->parity = channel->stats.parity_err;
 141         icount->brk = channel->stats.rcv_break;
 142         return 0;
 143 }
 144
 145 static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
 146 {
 147         struct tty_port *port = &channel->tty_port;
 148         unsigned char value;
 149         unsigned char flag;
 150         u8 isr;
 151
 152         do {
 153                 value = ioread8(&channel->regs->r.rhr);
 154                 flag = TTY_NORMAL;
 155                 /* Error: count statistics */
 156                 if (sr & SR_ERROR) {
 157                         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 158
 159                         if (sr & SR_OVERRUN_ERROR) {
 160                                 channel->stats.overrun_err++;
 161                                 /* Overrun doesn't affect the current character*/
 162                                 tty_insert_flip_char(port, 0, TTY_OVERRUN);
 163                         }
 164                         if (sr & SR_PARITY_ERROR) {
 165                                 channel->stats.parity_err++;
 166                                 flag = TTY_PARITY;
 167                         }
 168                         if (sr & SR_FRAMING_ERROR) {
 169                                 channel->stats.framing_err++;
 170                                 flag = TTY_FRAME;
 171                         }
 172                         if (sr & SR_RECEIVED_BREAK) {
 173                                 channel->stats.rcv_break++;
 174                                 flag = TTY_BREAK;
 175                         }
 176                 }
 177                 tty_insert_flip_char(port, value, flag);
 178
 179                 /* Check if there are more characters in RX FIFO
 180                  * If there are more, the isr register for this channel
 181                  * has enabled the RxRDY|FFULL bit.
 182                  */
 183                 isr = ioread8(&channel->block_regs->r.isr);
 184                 sr = ioread8(&channel->regs->r.sr);
 185         } while (isr & channel->isr_rx_rdy_mask);
 186
 187         tty_flip_buffer_push(port);
 188 }
 189
 190 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
 191 {
 192         unsigned char value;
 193         unsigned int *pointer_write = &channel->pointer_write;
 194
 195         if (channel->nb_bytes == 0)
 196                 return;
 197
 198         spin_lock(&channel->lock);
 199         value = channel->tty_port.xmit_buf[*pointer_write];
 200         iowrite8(value, &channel->regs->w.thr);
 201         channel->stats.tx++;
 202         (*pointer_write)++;
 203         *pointer_write = *pointer_write % PAGE_SIZE;
 204         channel->nb_bytes--;
 205         spin_unlock(&channel->lock);
 206 }
 207
 208 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
 209 {
 210         u8 isr, sr;
 211
 212         /* The HW is organized in pair of channels.  See which register we need
 213          * to read from */
 214         isr = ioread8(&channel->block_regs->r.isr);
 215         sr = ioread8(&channel->regs->r.sr);
 216
 217         if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B))
 218                 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
 219
 220         if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 221                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 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                         iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 226                         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 227                         channel->rx_enable = 1;
 228                 }
 229         }
 230
 231         /* RX data */
 232         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 233                 ipoctal_irq_rx(channel, sr);
 234
 235         /* TX of each character */
 236         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 237                 ipoctal_irq_tx(channel);
 238 }
 239
 240 static irqreturn_t ipoctal_irq_handler(void *arg)
 241 {
 242         unsigned int i;
 243         struct ipoctal *ipoctal = (struct ipoctal *) arg;
 244
 245         /* Clear the IPack device interrupt */
 246         readw(ipoctal->int_space + ACK_INT_REQ0);
 247         readw(ipoctal->int_space + ACK_INT_REQ1);
 248
 249         /* Check all channels */
 250         for (i = 0; i < NR_CHANNELS; i++)
 251                 ipoctal_irq_channel(&ipoctal->channel[i]);
 252
 253         return IRQ_HANDLED;
 254 }
 255
 256 static const struct tty_port_operations ipoctal_tty_port_ops = {
 257         .dtr_rts = NULL,
 258         .activate = ipoctal_port_activate,
 259 };
 260
 261 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 262                              unsigned int slot)
 263 {
 264         int res;
 265         int i;
 266         struct tty_driver *tty;
 267         char name[20];
 268         struct ipoctal_channel *channel;
 269         struct ipack_region *region;
 270         void __iomem *addr;
 271         union scc2698_channel __iomem *chan_regs;
 272         union scc2698_block __iomem *block_regs;
 273
 274         ipoctal->board_id = ipoctal->dev->id_device;
 275
 276         region = &ipoctal->dev->region[IPACK_IO_SPACE];
 277         addr = devm_ioremap(&ipoctal->dev->dev,
 278                                     region->start, region->size);
 279         if (!addr) {
 280                 dev_err(&ipoctal->dev->dev,
 281                         "Unable to map slot [%d:%d] IO space!\n",
 282                         bus_nr, slot);
 283                 return -EADDRNOTAVAIL;
 284         }
 285         /* Save the virtual address to access the registers easily */
 286         chan_regs =
 287                 (union scc2698_channel __iomem *) addr;
 288         block_regs =
 289                 (union scc2698_block __iomem *) addr;
 290
 291         region = &ipoctal->dev->region[IPACK_INT_SPACE];
 292         ipoctal->int_space =
 293                 devm_ioremap(&ipoctal->dev->dev,
 294                                      region->start, region->size);
 295         if (!ipoctal->int_space) {
 296                 dev_err(&ipoctal->dev->dev,
 297                         "Unable to map slot [%d:%d] INT space!\n",
 298                         bus_nr, slot);
 299                 return -EADDRNOTAVAIL;
 300         }
 301
 302         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
 303         ipoctal->mem8_space =
 304                 devm_ioremap(&ipoctal->dev->dev,
 305                                      region->start, 0x8000);
 306         if (!ipoctal->mem8_space) {
 307                 dev_err(&ipoctal->dev->dev,
 308                         "Unable to map slot [%d:%d] MEM8 space!\n",
 309                         bus_nr, slot);
 310                 return -EADDRNOTAVAIL;
 311         }
 312
 313
 314         /* Disable RX and TX before touching anything */
 315         for (i = 0; i < NR_CHANNELS ; i++) {
 316                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 317                 channel->regs = chan_regs + i;
 318                 channel->block_regs = block_regs + (i >> 1);
 319                 channel->board_id = ipoctal->board_id;
 320                 if (i & 1) {
 321                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 322                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 323                 } else {
 324                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 325                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 326                 }
 327
 328                 ipoctal_reset_channel(channel);
 329                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 330                          &channel->regs->w.mr); /* mr1 */
 331                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 332                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 333         }
 334
 335         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 336                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 337                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 338                          &block_regs[i].w.opcr);
 339                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 340                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 341                          &block_regs[i].w.imr);
 342         }
 343
 344         /* Dummy write */
 345         iowrite8(1, ipoctal->mem8_space + 1);
 346
 347         /* Register the TTY device */
 348
 349         /* Each IP-OCTAL channel is a TTY port */
 350         tty = tty_alloc_driver(NR_CHANNELS, TTY_DRIVER_REAL_RAW |
 351                         TTY_DRIVER_DYNAMIC_DEV);
 352         if (IS_ERR(tty))
 353                 return PTR_ERR(tty);
 354
 355         /* Fill struct tty_driver with ipoctal data */
 356         tty->owner = THIS_MODULE;
 357         tty->driver_name = KBUILD_MODNAME;
 358         sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
 359         tty->name = name;
 360         tty->major = 0;
 361
 362         tty->minor_start = 0;
 363         tty->type = TTY_DRIVER_TYPE_SERIAL;
 364         tty->subtype = SERIAL_TYPE_NORMAL;
 365         tty->init_termios = tty_std_termios;
 366         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 367         tty->init_termios.c_ispeed = 9600;
 368         tty->init_termios.c_ospeed = 9600;
 369
 370         tty_set_operations(tty, &ipoctal_fops);
 371         res = tty_register_driver(tty);
 372         if (res) {
 373                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 374                 tty_driver_kref_put(tty);
 375                 return res;
 376         }
 377
 378         /* Save struct tty_driver for use it when uninstalling the device */
 379         ipoctal->tty_drv = tty;
 380
 381         for (i = 0; i < NR_CHANNELS; i++) {
 382                 struct device *tty_dev;
 383
 384                 channel = &ipoctal->channel[i];
 385                 tty_port_init(&channel->tty_port);
 386                 tty_port_alloc_xmit_buf(&channel->tty_port);
 387                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 388
 389                 ipoctal_reset_stats(&channel->stats);
 390                 channel->nb_bytes = 0;
 391                 spin_lock_init(&channel->lock);
 392                 channel->pointer_read = 0;
 393                 channel->pointer_write = 0;
 394                 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
 395                 if (IS_ERR(tty_dev)) {
 396                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
 397                         tty_port_destroy(&channel->tty_port);
 398                         continue;
 399                 }
 400                 dev_set_drvdata(tty_dev, channel);
 401         }
 402
 403         /*
 404          * IP-OCTAL has different addresses to copy its IRQ vector.
 405          * Depending of the carrier these addresses are accesible or not.
 406          * More info in the datasheet.
 407          */
 408         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
 409                                        ipoctal_irq_handler, ipoctal);
 410
 411         return 0;
 412 }
 413
 414 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 415                                             const unsigned char *buf,
 416                                             int count)
 417 {
 418         unsigned long flags;
 419         int i;
 420         unsigned int *pointer_read = &channel->pointer_read;
 421
 422         /* Copy the bytes from the user buffer to the internal one */
 423         for (i = 0; i < count; i++) {
 424                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 425                         spin_lock_irqsave(&channel->lock, flags);
 426                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 427                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 428                         channel->nb_bytes++;
 429                         spin_unlock_irqrestore(&channel->lock, flags);
 430                 } else {
 431                         break;
 432                 }
 433         }
 434         return i;
 435 }
 436
 437 static int ipoctal_write_tty(struct tty_struct *tty,
 438                              const unsigned char *buf, int count)
 439 {
 440         struct ipoctal_channel *channel = tty->driver_data;
 441         unsigned int char_copied;
 442
 443         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
 444
 445         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 446         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 447                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 448                 channel->rx_enable = 0;
 449                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 450         }
 451
 452         /*
 453          * Send a packet and then disable TX to avoid failure after several send
 454          * operations
 455          */
 456         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 457         return char_copied;
 458 }
 459
 460 static unsigned int ipoctal_write_room(struct tty_struct *tty)
 461 {
 462         struct ipoctal_channel *channel = tty->driver_data;
 463
 464         return PAGE_SIZE - channel->nb_bytes;
 465 }
 466
 467 static unsigned int ipoctal_chars_in_buffer(struct tty_struct *tty)
 468 {
 469         struct ipoctal_channel *channel = tty->driver_data;
 470
 471         return channel->nb_bytes;
 472 }
 473
 474 static void ipoctal_set_termios(struct tty_struct *tty,
 475                                 struct ktermios *old_termios)
 476 {
 477         unsigned int cflag;
 478         unsigned char mr1 = 0;
 479         unsigned char mr2 = 0;
 480         unsigned char csr = 0;
 481         struct ipoctal_channel *channel = tty->driver_data;
 482         speed_t baud;
 483
 484         cflag = tty->termios.c_cflag;
 485
 486         /* Disable and reset everything before change the setup */
 487         ipoctal_reset_channel(channel);
 488
 489         /* Set Bits per chars */
 490         switch (cflag & CSIZE) {
 491         case CS6:
 492                 mr1 |= MR1_CHRL_6_BITS;
 493                 break;
 494         case CS7:
 495                 mr1 |= MR1_CHRL_7_BITS;
 496                 break;
 497         case CS8:
 498         default:
 499                 mr1 |= MR1_CHRL_8_BITS;
 500                 /* By default, select CS8 */
 501                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
 502                 break;
 503         }
 504
 505         /* Set Parity */
 506         if (cflag & PARENB)
 507                 if (cflag & PARODD)
 508                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 509                 else
 510                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 511         else
 512                 mr1 |= MR1_PARITY_OFF;
 513
 514         /* Mark or space parity is not supported */
 515         tty->termios.c_cflag &= ~CMSPAR;
 516
 517         /* Set stop bits */
 518         if (cflag & CSTOPB)
 519                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 520         else
 521                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 522
 523         /* Set the flow control */
 524         switch (channel->board_id) {
 525         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 526                 if (cflag & CRTSCTS) {
 527                         mr1 |= MR1_RxRTS_CONTROL_ON;
 528                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 529                 } else {
 530                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 531                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 532                 }
 533                 break;
 534         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 535                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 536                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 537                 break;
 538         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 539                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 540                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 541                 break;
 542         default:
 543                 return;
 544         }
 545
 546         baud = tty_get_baud_rate(tty);
 547         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
 548
 549         /* Set baud rate */
 550         switch (baud) {
 551         case 75:
 552                 csr |= TX_CLK_75 | RX_CLK_75;
 553                 break;
 554         case 110:
 555                 csr |= TX_CLK_110 | RX_CLK_110;
 556                 break;
 557         case 150:
 558                 csr |= TX_CLK_150 | RX_CLK_150;
 559                 break;
 560         case 300:
 561                 csr |= TX_CLK_300 | RX_CLK_300;
 562                 break;
 563         case 600:
 564                 csr |= TX_CLK_600 | RX_CLK_600;
 565                 break;
 566         case 1200:
 567                 csr |= TX_CLK_1200 | RX_CLK_1200;
 568                 break;
 569         case 1800:
 570                 csr |= TX_CLK_1800 | RX_CLK_1800;
 571                 break;
 572         case 2000:
 573                 csr |= TX_CLK_2000 | RX_CLK_2000;
 574                 break;
 575         case 2400:
 576                 csr |= TX_CLK_2400 | RX_CLK_2400;
 577                 break;
 578         case 4800:
 579                 csr |= TX_CLK_4800  | RX_CLK_4800;
 580                 break;
 581         case 9600:
 582                 csr |= TX_CLK_9600  | RX_CLK_9600;
 583                 break;
 584         case 19200:
 585                 csr |= TX_CLK_19200 | RX_CLK_19200;
 586                 break;
 587         case 38400:
 588         default:
 589                 csr |= TX_CLK_38400 | RX_CLK_38400;
 590                 /* In case of default, we establish 38400 bps */
 591                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
 592                 break;
 593         }
 594
 595         mr1 |= MR1_ERROR_CHAR;
 596         mr1 |= MR1_RxINT_RxRDY;
 597
 598         /* Write the control registers */
 599         iowrite8(mr1, &channel->regs->w.mr);
 600         iowrite8(mr2, &channel->regs->w.mr);
 601         iowrite8(csr, &channel->regs->w.csr);
 602
 603         /* Enable again the RX, if it was before */
 604         if (channel->rx_enable)
 605                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 606 }
 607
 608 static void ipoctal_hangup(struct tty_struct *tty)
 609 {
 610         unsigned long flags;
 611         struct ipoctal_channel *channel = tty->driver_data;
 612
 613         if (channel == NULL)
 614                 return;
 615
 616         spin_lock_irqsave(&channel->lock, flags);
 617         channel->nb_bytes = 0;
 618         channel->pointer_read = 0;
 619         channel->pointer_write = 0;
 620         spin_unlock_irqrestore(&channel->lock, flags);
 621
 622         tty_port_hangup(&channel->tty_port);
 623
 624         ipoctal_reset_channel(channel);
 625         tty_port_set_initialized(&channel->tty_port, 0);
 626         wake_up_interruptible(&channel->tty_port.open_wait);
 627 }
 628
 629 static void ipoctal_shutdown(struct tty_struct *tty)
 630 {
 631         struct ipoctal_channel *channel = tty->driver_data;
 632
 633         if (channel == NULL)
 634                 return;
 635
 636         ipoctal_reset_channel(channel);
 637         tty_port_set_initialized(&channel->tty_port, 0);
 638 }
 639
 640 static void ipoctal_cleanup(struct tty_struct *tty)
 641 {
 642         struct ipoctal_channel *channel = tty->driver_data;
 643         struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
 644
 645         /* release the carrier driver */
 646         ipack_put_carrier(ipoctal->dev);
 647 }
 648
 649 static const struct tty_operations ipoctal_fops = {
 650         .ioctl =                NULL,
 651         .open =                 ipoctal_open,
 652         .close =                ipoctal_close,
 653         .write =                ipoctal_write_tty,
 654         .set_termios =          ipoctal_set_termios,
 655         .write_room =           ipoctal_write_room,
 656         .chars_in_buffer =      ipoctal_chars_in_buffer,
 657         .get_icount =           ipoctal_get_icount,
 658         .hangup =               ipoctal_hangup,
 659         .shutdown =             ipoctal_shutdown,
 660         .cleanup =              ipoctal_cleanup,
 661 };
 662
 663 static int ipoctal_probe(struct ipack_device *dev)
 664 {
 665         int res;
 666         struct ipoctal *ipoctal;
 667
 668         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
 669         if (ipoctal == NULL)
 670                 return -ENOMEM;
 671
 672         ipoctal->dev = dev;
 673         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
 674         if (res)
 675                 goto out_uninst;
 676
 677         dev_set_drvdata(&dev->dev, ipoctal);
 678         return 0;
 679
 680 out_uninst:
 681         kfree(ipoctal);
 682         return res;
 683 }
 684
 685 static void __ipoctal_remove(struct ipoctal *ipoctal)
 686 {
 687         int i;
 688
 689         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
 690
 691         for (i = 0; i < NR_CHANNELS; i++) {
 692                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 693                 tty_unregister_device(ipoctal->tty_drv, i);
 694                 tty_port_free_xmit_buf(&channel->tty_port);
 695                 tty_port_destroy(&channel->tty_port);
 696         }
 697
 698         tty_unregister_driver(ipoctal->tty_drv);
 699         tty_driver_kref_put(ipoctal->tty_drv);
 700         kfree(ipoctal);
 701 }
 702
 703 static void ipoctal_remove(struct ipack_device *idev)
 704 {
 705         __ipoctal_remove(dev_get_drvdata(&idev->dev));
 706 }
 707
 708 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
 709         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 710                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
 711         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 712                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
 713         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 714                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
 715         { 0, },
 716 };
 717
 718 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
 719
 720 static const struct ipack_driver_ops ipoctal_drv_ops = {
 721         .probe  = ipoctal_probe,
 722         .remove = ipoctal_remove,
 723 };
 724
 725 static struct ipack_driver driver = {
 726         .ops      = &ipoctal_drv_ops,
 727         .id_table = ipoctal_ids,
 728 };
 729
 730 static int __init ipoctal_init(void)
 731 {
 732         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
 733 }
 734
 735 static void __exit ipoctal_exit(void)
 736 {
 737         ipack_driver_unregister(&driver);
 738 }
 739
 740 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
 741 MODULE_LICENSE("GPL");
 742
 743 module_init(ipoctal_init);
 744 module_exit(ipoctal_exit);