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/io.h>
  24 #include <linux/ipack.h>
  25 #include "ipoctal.h"
  26 #include "scc2698.h"
  27
  28 #define IP_OCTAL_ID_SPACE_VECTOR    0x41
  29 #define IP_OCTAL_NB_BLOCKS          4
  30
  31 static const struct tty_operations ipoctal_fops;
  32
  33 struct ipoctal_channel {
  34         struct ipoctal_stats            stats;
  35         unsigned int                    nb_bytes;
  36         wait_queue_head_t               queue;
  37         spinlock_t                      lock;
  38         unsigned int                    pointer_read;
  39         unsigned int                    pointer_write;
  40         struct tty_port                 tty_port;
  41         union scc2698_channel __iomem   *regs;
  42         union scc2698_block __iomem     *block_regs;
  43         unsigned int                    board_id;
  44         u8                              isr_rx_rdy_mask;
  45         u8                              isr_tx_rdy_mask;
  46         unsigned int                    rx_enable;
  47 };
  48
  49 struct ipoctal {
  50         struct ipack_device             *dev;
  51         unsigned int                    board_id;
  52         struct ipoctal_channel          channel[NR_CHANNELS];
  53         struct tty_driver               *tty_drv;
  54         u8 __iomem                      *mem8_space;
  55         u8 __iomem                      *int_space;
  56 };
  57
  58 static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
  59                                               unsigned int index)
  60 {
  61         return container_of(chan, struct ipoctal, channel[index]);
  62 }
  63
  64 static void ipoctal_reset_channel(struct ipoctal_channel *channel)
  65 {
  66         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
  67         channel->rx_enable = 0;
  68         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
  69         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
  70         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
  71         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
  72 }
  73
  74 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
  75 {
  76         struct ipoctal_channel *channel;
  77
  78         channel = dev_get_drvdata(tty->dev);
  79
  80         /*
  81          * Enable RX. TX will be enabled when
  82          * there is something to send
  83          */
  84         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
  85         channel->rx_enable = 1;
  86         return 0;
  87 }
  88
  89 static int ipoctal_open(struct tty_struct *tty, struct file *file)
  90 {
  91         struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
  92         struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
  93         int err;
  94
  95         tty->driver_data = channel;
  96
  97         if (!ipack_get_carrier(ipoctal->dev))
  98                 return -EBUSY;
  99
 100         err = tty_port_open(&channel->tty_port, tty, file);
 101         if (err)
 102                 ipack_put_carrier(ipoctal->dev);
 103
 104         return err;
 105 }
 106
 107 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
 108 {
 109         stats->tx = 0;
 110         stats->rx = 0;
 111         stats->rcv_break = 0;
 112         stats->framing_err = 0;
 113         stats->overrun_err = 0;
 114         stats->parity_err = 0;
 115 }
 116
 117 static void ipoctal_free_channel(struct ipoctal_channel *channel)
 118 {
 119         ipoctal_reset_stats(&channel->stats);
 120         channel->pointer_read = 0;
 121         channel->pointer_write = 0;
 122         channel->nb_bytes = 0;
 123 }
 124
 125 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
 126 {
 127         struct ipoctal_channel *channel = tty->driver_data;
 128
 129         tty_port_close(&channel->tty_port, tty, filp);
 130         ipoctal_free_channel(channel);
 131 }
 132
 133 static int ipoctal_get_icount(struct tty_struct *tty,
 134                               struct serial_icounter_struct *icount)
 135 {
 136         struct ipoctal_channel *channel = tty->driver_data;
 137
 138         icount->cts = 0;
 139         icount->dsr = 0;
 140         icount->rng = 0;
 141         icount->dcd = 0;
 142         icount->rx = channel->stats.rx;
 143         icount->tx = channel->stats.tx;
 144         icount->frame = channel->stats.framing_err;
 145         icount->parity = channel->stats.parity_err;
 146         icount->brk = channel->stats.rcv_break;
 147         return 0;
 148 }
 149
 150 static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
 151 {
 152         struct tty_port *port = &channel->tty_port;
 153         unsigned char value;
 154         unsigned char flag;
 155         u8 isr;
 156
 157         do {
 158                 value = ioread8(&channel->regs->r.rhr);
 159                 flag = TTY_NORMAL;
 160                 /* Error: count statistics */
 161                 if (sr & SR_ERROR) {
 162                         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 163
 164                         if (sr & SR_OVERRUN_ERROR) {
 165                                 channel->stats.overrun_err++;
 166                                 /* Overrun doesn't affect the current character*/
 167                                 tty_insert_flip_char(port, 0, TTY_OVERRUN);
 168                         }
 169                         if (sr & SR_PARITY_ERROR) {
 170                                 channel->stats.parity_err++;
 171                                 flag = TTY_PARITY;
 172                         }
 173                         if (sr & SR_FRAMING_ERROR) {
 174                                 channel->stats.framing_err++;
 175                                 flag = TTY_FRAME;
 176                         }
 177                         if (sr & SR_RECEIVED_BREAK) {
 178                                 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
 179                                 channel->stats.rcv_break++;
 180                                 flag = TTY_BREAK;
 181                         }
 182                 }
 183                 tty_insert_flip_char(port, value, flag);
 184
 185                 /* Check if there are more characters in RX FIFO
 186                  * If there are more, the isr register for this channel
 187                  * has enabled the RxRDY|FFULL bit.
 188                  */
 189                 isr = ioread8(&channel->block_regs->r.isr);
 190                 sr = ioread8(&channel->regs->r.sr);
 191         } while (isr & channel->isr_rx_rdy_mask);
 192
 193         tty_flip_buffer_push(port);
 194 }
 195
 196 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
 197 {
 198         unsigned char value;
 199         unsigned int *pointer_write = &channel->pointer_write;
 200
 201         if (channel->nb_bytes == 0)
 202                 return;
 203
 204         spin_lock(&channel->lock);
 205         value = channel->tty_port.xmit_buf[*pointer_write];
 206         iowrite8(value, &channel->regs->w.thr);
 207         channel->stats.tx++;
 208         (*pointer_write)++;
 209         *pointer_write = *pointer_write % PAGE_SIZE;
 210         channel->nb_bytes--;
 211         spin_unlock(&channel->lock);
 212 }
 213
 214 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
 215 {
 216         u8 isr, sr;
 217
 218         /* The HW is organized in pair of channels.  See which register we need
 219          * to read from */
 220         isr = ioread8(&channel->block_regs->r.isr);
 221         sr = ioread8(&channel->regs->r.sr);
 222
 223         if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 224                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 225                 /* In case of RS-485, change from TX to RX when finishing TX.
 226                  * Half-duplex. */
 227                 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 228                         iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 229                         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 230                         channel->rx_enable = 1;
 231                 }
 232         }
 233
 234         /* RX data */
 235         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 236                 ipoctal_irq_rx(channel, sr);
 237
 238         /* TX of each character */
 239         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 240                 ipoctal_irq_tx(channel);
 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         /* Clear the IPack device interrupt */
 249         readw(ipoctal->int_space + ACK_INT_REQ0);
 250         readw(ipoctal->int_space + ACK_INT_REQ1);
 251
 252         /* Check all channels */
 253         for (i = 0; i < NR_CHANNELS; i++)
 254                 ipoctal_irq_channel(&ipoctal->channel[i]);
 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 (!ipoctal->mem8_space) {
 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_id = ipoctal->board_id;
 323                 if (i & 1) {
 324                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 325                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 326                 } else {
 327                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 328                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 329                 }
 330
 331                 ipoctal_reset_channel(channel);
 332                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 333                          &channel->regs->w.mr); /* mr1 */
 334                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 335                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 336         }
 337
 338         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 339                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 340                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 341                          &block_regs[i].w.opcr);
 342                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 343                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 344                          &block_regs[i].w.imr);
 345         }
 346
 347         /* Dummy write */
 348         iowrite8(1, ipoctal->mem8_space + 1);
 349
 350         /* Register the TTY device */
 351
 352         /* Each IP-OCTAL channel is a TTY port */
 353         tty = alloc_tty_driver(NR_CHANNELS);
 354
 355         if (!tty)
 356                 return -ENOMEM;
 357
 358         /* Fill struct tty_driver with ipoctal data */
 359         tty->owner = THIS_MODULE;
 360         tty->driver_name = KBUILD_MODNAME;
 361         sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
 362         tty->name = name;
 363         tty->major = 0;
 364
 365         tty->minor_start = 0;
 366         tty->type = TTY_DRIVER_TYPE_SERIAL;
 367         tty->subtype = SERIAL_TYPE_NORMAL;
 368         tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 369         tty->init_termios = tty_std_termios;
 370         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 371         tty->init_termios.c_ispeed = 9600;
 372         tty->init_termios.c_ospeed = 9600;
 373
 374         tty_set_operations(tty, &ipoctal_fops);
 375         res = tty_register_driver(tty);
 376         if (res) {
 377                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 378                 put_tty_driver(tty);
 379                 return res;
 380         }
 381
 382         /* Save struct tty_driver for use it when uninstalling the device */
 383         ipoctal->tty_drv = tty;
 384
 385         for (i = 0; i < NR_CHANNELS; i++) {
 386                 struct device *tty_dev;
 387
 388                 channel = &ipoctal->channel[i];
 389                 tty_port_init(&channel->tty_port);
 390                 tty_port_alloc_xmit_buf(&channel->tty_port);
 391                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 392
 393                 ipoctal_reset_stats(&channel->stats);
 394                 channel->nb_bytes = 0;
 395                 spin_lock_init(&channel->lock);
 396                 channel->pointer_read = 0;
 397                 channel->pointer_write = 0;
 398                 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
 399                 if (IS_ERR(tty_dev)) {
 400                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
 401                         tty_port_destroy(&channel->tty_port);
 402                         continue;
 403                 }
 404                 dev_set_drvdata(tty_dev, channel);
 405         }
 406
 407         /*
 408          * IP-OCTAL has different addresses to copy its IRQ vector.
 409          * Depending of the carrier these addresses are accesible or not.
 410          * More info in the datasheet.
 411          */
 412         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
 413                                        ipoctal_irq_handler, ipoctal);
 414
 415         return 0;
 416 }
 417
 418 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 419                                             const unsigned char *buf,
 420                                             int count)
 421 {
 422         unsigned long flags;
 423         int i;
 424         unsigned int *pointer_read = &channel->pointer_read;
 425
 426         /* Copy the bytes from the user buffer to the internal one */
 427         for (i = 0; i < count; i++) {
 428                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 429                         spin_lock_irqsave(&channel->lock, flags);
 430                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 431                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 432                         channel->nb_bytes++;
 433                         spin_unlock_irqrestore(&channel->lock, flags);
 434                 } else {
 435                         break;
 436                 }
 437         }
 438         return i;
 439 }
 440
 441 static int ipoctal_write_tty(struct tty_struct *tty,
 442                              const unsigned char *buf, int count)
 443 {
 444         struct ipoctal_channel *channel = tty->driver_data;
 445         unsigned int char_copied;
 446
 447         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
 448
 449         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 450         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 451                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 452                 channel->rx_enable = 0;
 453                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 454         }
 455
 456         /*
 457          * Send a packet and then disable TX to avoid failure after several send
 458          * operations
 459          */
 460         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 461         return char_copied;
 462 }
 463
 464 static int ipoctal_write_room(struct tty_struct *tty)
 465 {
 466         struct ipoctal_channel *channel = tty->driver_data;
 467
 468         return PAGE_SIZE - channel->nb_bytes;
 469 }
 470
 471 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
 472 {
 473         struct ipoctal_channel *channel = tty->driver_data;
 474
 475         return channel->nb_bytes;
 476 }
 477
 478 static void ipoctal_set_termios(struct tty_struct *tty,
 479                                 struct ktermios *old_termios)
 480 {
 481         unsigned int cflag;
 482         unsigned char mr1 = 0;
 483         unsigned char mr2 = 0;
 484         unsigned char csr = 0;
 485         struct ipoctal_channel *channel = tty->driver_data;
 486         speed_t baud;
 487
 488         cflag = tty->termios.c_cflag;
 489
 490         /* Disable and reset everything before change the setup */
 491         ipoctal_reset_channel(channel);
 492
 493         /* Set Bits per chars */
 494         switch (cflag & CSIZE) {
 495         case CS6:
 496                 mr1 |= MR1_CHRL_6_BITS;
 497                 break;
 498         case CS7:
 499                 mr1 |= MR1_CHRL_7_BITS;
 500                 break;
 501         case CS8:
 502         default:
 503                 mr1 |= MR1_CHRL_8_BITS;
 504                 /* By default, select CS8 */
 505                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
 506                 break;
 507         }
 508
 509         /* Set Parity */
 510         if (cflag & PARENB)
 511                 if (cflag & PARODD)
 512                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 513                 else
 514                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 515         else
 516                 mr1 |= MR1_PARITY_OFF;
 517
 518         /* Mark or space parity is not supported */
 519         tty->termios.c_cflag &= ~CMSPAR;
 520
 521         /* Set stop bits */
 522         if (cflag & CSTOPB)
 523                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 524         else
 525                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 526
 527         /* Set the flow control */
 528         switch (channel->board_id) {
 529         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 530                 if (cflag & CRTSCTS) {
 531                         mr1 |= MR1_RxRTS_CONTROL_ON;
 532                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 533                 } else {
 534                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 535                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 536                 }
 537                 break;
 538         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 539                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 540                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 541                 break;
 542         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 543                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 544                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 545                 break;
 546         default:
 547                 return;
 548                 break;
 549         }
 550
 551         baud = tty_get_baud_rate(tty);
 552         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
 553
 554         /* Set baud rate */
 555         switch (baud) {
 556         case 75:
 557                 csr |= TX_CLK_75 | RX_CLK_75;
 558                 break;
 559         case 110:
 560                 csr |= TX_CLK_110 | RX_CLK_110;
 561                 break;
 562         case 150:
 563                 csr |= TX_CLK_150 | RX_CLK_150;
 564                 break;
 565         case 300:
 566                 csr |= TX_CLK_300 | RX_CLK_300;
 567                 break;
 568         case 600:
 569                 csr |= TX_CLK_600 | RX_CLK_600;
 570                 break;
 571         case 1200:
 572                 csr |= TX_CLK_1200 | RX_CLK_1200;
 573                 break;
 574         case 1800:
 575                 csr |= TX_CLK_1800 | RX_CLK_1800;
 576                 break;
 577         case 2000:
 578                 csr |= TX_CLK_2000 | RX_CLK_2000;
 579                 break;
 580         case 2400:
 581                 csr |= TX_CLK_2400 | RX_CLK_2400;
 582                 break;
 583         case 4800:
 584                 csr |= TX_CLK_4800  | RX_CLK_4800;
 585                 break;
 586         case 9600:
 587                 csr |= TX_CLK_9600  | RX_CLK_9600;
 588                 break;
 589         case 19200:
 590                 csr |= TX_CLK_19200 | RX_CLK_19200;
 591                 break;
 592         case 38400:
 593         default:
 594                 csr |= TX_CLK_38400 | RX_CLK_38400;
 595                 /* In case of default, we establish 38400 bps */
 596                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
 597                 break;
 598         }
 599
 600         mr1 |= MR1_ERROR_CHAR;
 601         mr1 |= MR1_RxINT_RxRDY;
 602
 603         /* Write the control registers */
 604         iowrite8(mr1, &channel->regs->w.mr);
 605         iowrite8(mr2, &channel->regs->w.mr);
 606         iowrite8(csr, &channel->regs->w.csr);
 607
 608         /* Enable again the RX, if it was before */
 609         if (channel->rx_enable)
 610                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 611 }
 612
 613 static void ipoctal_hangup(struct tty_struct *tty)
 614 {
 615         unsigned long flags;
 616         struct ipoctal_channel *channel = tty->driver_data;
 617
 618         if (channel == NULL)
 619                 return;
 620
 621         spin_lock_irqsave(&channel->lock, flags);
 622         channel->nb_bytes = 0;
 623         channel->pointer_read = 0;
 624         channel->pointer_write = 0;
 625         spin_unlock_irqrestore(&channel->lock, flags);
 626
 627         tty_port_hangup(&channel->tty_port);
 628
 629         ipoctal_reset_channel(channel);
 630
 631         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 632         wake_up_interruptible(&channel->tty_port.open_wait);
 633 }
 634
 635 static void ipoctal_shutdown(struct tty_struct *tty)
 636 {
 637         struct ipoctal_channel *channel = tty->driver_data;
 638
 639         if (channel == NULL)
 640                 return;
 641
 642         ipoctal_reset_channel(channel);
 643         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 644 }
 645
 646 static void ipoctal_cleanup(struct tty_struct *tty)
 647 {
 648         struct ipoctal_channel *channel = tty->driver_data;
 649         struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
 650
 651         /* release the carrier driver */
 652         ipack_put_carrier(ipoctal->dev);
 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         .shutdown =             ipoctal_shutdown,
 666         .cleanup =              ipoctal_cleanup,
 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);