drivers/ipack/devices/ipoctal.c

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