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 int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
  59 {
  60         struct ipoctal_channel *channel;
  61
  62         channel = dev_get_drvdata(tty->dev);
  63
  64         /*
  65          * Enable RX. TX will be enabled when
  66          * there is something to send
  67          */
  68         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
  69         channel->rx_enable = 1;
  70         return 0;
  71 }
  72
  73 static int ipoctal_open(struct tty_struct *tty, struct file *file)
  74 {
  75         struct ipoctal_channel *channel;
  76
  77         channel = dev_get_drvdata(tty->dev);
  78         tty->driver_data = channel;
  79
  80         return tty_port_open(&channel->tty_port, tty, file);
  81 }
  82
  83 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
  84 {
  85         stats->tx = 0;
  86         stats->rx = 0;
  87         stats->rcv_break = 0;
  88         stats->framing_err = 0;
  89         stats->overrun_err = 0;
  90         stats->parity_err = 0;
  91 }
  92
  93 static void ipoctal_free_channel(struct ipoctal_channel *channel)
  94 {
  95         ipoctal_reset_stats(&channel->stats);
  96         channel->pointer_read = 0;
  97         channel->pointer_write = 0;
  98         channel->nb_bytes = 0;
  99 }
 100
 101 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
 102 {
 103         struct ipoctal_channel *channel = tty->driver_data;
 104
 105         tty_port_close(&channel->tty_port, tty, filp);
 106         ipoctal_free_channel(channel);
 107 }
 108
 109 static int ipoctal_get_icount(struct tty_struct *tty,
 110                               struct serial_icounter_struct *icount)
 111 {
 112         struct ipoctal_channel *channel = tty->driver_data;
 113
 114         icount->cts = 0;
 115         icount->dsr = 0;
 116         icount->rng = 0;
 117         icount->dcd = 0;
 118         icount->rx = channel->stats.rx;
 119         icount->tx = channel->stats.tx;
 120         icount->frame = channel->stats.framing_err;
 121         icount->parity = channel->stats.parity_err;
 122         icount->brk = channel->stats.rcv_break;
 123         return 0;
 124 }
 125
 126 static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
 127 {
 128         struct tty_port *port = &channel->tty_port;
 129         unsigned char value;
 130         unsigned char flag;
 131         u8 isr;
 132
 133         do {
 134                 value = ioread8(&channel->regs->r.rhr);
 135                 flag = TTY_NORMAL;
 136                 /* Error: count statistics */
 137                 if (sr & SR_ERROR) {
 138                         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 139
 140                         if (sr & SR_OVERRUN_ERROR) {
 141                                 channel->stats.overrun_err++;
 142                                 /* Overrun doesn't affect the current character*/
 143                                 tty_insert_flip_char(port, 0, TTY_OVERRUN);
 144                         }
 145                         if (sr & SR_PARITY_ERROR) {
 146                                 channel->stats.parity_err++;
 147                                 flag = TTY_PARITY;
 148                         }
 149                         if (sr & SR_FRAMING_ERROR) {
 150                                 channel->stats.framing_err++;
 151                                 flag = TTY_FRAME;
 152                         }
 153                         if (sr & SR_RECEIVED_BREAK) {
 154                                 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
 155                                 channel->stats.rcv_break++;
 156                                 flag = TTY_BREAK;
 157                         }
 158                 }
 159                 tty_insert_flip_char(port, value, flag);
 160
 161                 /* Check if there are more characters in RX FIFO
 162                  * If there are more, the isr register for this channel
 163                  * has enabled the RxRDY|FFULL bit.
 164                  */
 165                 isr = ioread8(&channel->block_regs->r.isr);
 166                 sr = ioread8(&channel->regs->r.sr);
 167         } while (isr & channel->isr_rx_rdy_mask);
 168
 169         tty_flip_buffer_push(port);
 170 }
 171
 172 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
 173 {
 174         unsigned char value;
 175         unsigned int *pointer_write = &channel->pointer_write;
 176
 177         if (channel->nb_bytes == 0)
 178                 return;
 179
 180         spin_lock(&channel->lock);
 181         value = channel->tty_port.xmit_buf[*pointer_write];
 182         iowrite8(value, &channel->regs->w.thr);
 183         channel->stats.tx++;
 184         (*pointer_write)++;
 185         *pointer_write = *pointer_write % PAGE_SIZE;
 186         channel->nb_bytes--;
 187         spin_unlock(&channel->lock);
 188 }
 189
 190 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
 191 {
 192         u8 isr, sr;
 193
 194         /* The HW is organized in pair of channels.  See which register we need
 195          * to read from */
 196         isr = ioread8(&channel->block_regs->r.isr);
 197         sr = ioread8(&channel->regs->r.sr);
 198
 199         if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 200                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 201                 /* In case of RS-485, change from TX to RX when finishing TX.
 202                  * Half-duplex. */
 203                 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 204                         iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 205                         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 206                         channel->rx_enable = 1;
 207                 }
 208         }
 209
 210         /* RX data */
 211         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 212                 ipoctal_irq_rx(channel, sr);
 213
 214         /* TX of each character */
 215         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 216                 ipoctal_irq_tx(channel);
 217 }
 218
 219 static irqreturn_t ipoctal_irq_handler(void *arg)
 220 {
 221         unsigned int i;
 222         struct ipoctal *ipoctal = (struct ipoctal *) arg;
 223
 224         /* Clear the IPack device interrupt */
 225         readw(ipoctal->int_space + ACK_INT_REQ0);
 226         readw(ipoctal->int_space + ACK_INT_REQ1);
 227
 228         /* Check all channels */
 229         for (i = 0; i < NR_CHANNELS; i++)
 230                 ipoctal_irq_channel(&ipoctal->channel[i]);
 231
 232         return IRQ_HANDLED;
 233 }
 234
 235 static const struct tty_port_operations ipoctal_tty_port_ops = {
 236         .dtr_rts = NULL,
 237         .activate = ipoctal_port_activate,
 238 };
 239
 240 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 241                              unsigned int slot)
 242 {
 243         int res;
 244         int i;
 245         struct tty_driver *tty;
 246         char name[20];
 247         struct ipoctal_channel *channel;
 248         struct ipack_region *region;
 249         void __iomem *addr;
 250         union scc2698_channel __iomem *chan_regs;
 251         union scc2698_block __iomem *block_regs;
 252
 253         ipoctal->board_id = ipoctal->dev->id_device;
 254
 255         region = &ipoctal->dev->region[IPACK_IO_SPACE];
 256         addr = devm_ioremap_nocache(&ipoctal->dev->dev,
 257                                     region->start, region->size);
 258         if (!addr) {
 259                 dev_err(&ipoctal->dev->dev,
 260                         "Unable to map slot [%d:%d] IO space!\n",
 261                         bus_nr, slot);
 262                 return -EADDRNOTAVAIL;
 263         }
 264         /* Save the virtual address to access the registers easily */
 265         chan_regs =
 266                 (union scc2698_channel __iomem *) addr;
 267         block_regs =
 268                 (union scc2698_block __iomem *) addr;
 269
 270         region = &ipoctal->dev->region[IPACK_INT_SPACE];
 271         ipoctal->int_space =
 272                 devm_ioremap_nocache(&ipoctal->dev->dev,
 273                                      region->start, region->size);
 274         if (!ipoctal->int_space) {
 275                 dev_err(&ipoctal->dev->dev,
 276                         "Unable to map slot [%d:%d] INT space!\n",
 277                         bus_nr, slot);
 278                 return -EADDRNOTAVAIL;
 279         }
 280
 281         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
 282         ipoctal->mem8_space =
 283                 devm_ioremap_nocache(&ipoctal->dev->dev,
 284                                      region->start, 0x8000);
 285         if (!ipoctal->mem8_space) {
 286                 dev_err(&ipoctal->dev->dev,
 287                         "Unable to map slot [%d:%d] MEM8 space!\n",
 288                         bus_nr, slot);
 289                 return -EADDRNOTAVAIL;
 290         }
 291
 292
 293         /* Disable RX and TX before touching anything */
 294         for (i = 0; i < NR_CHANNELS ; i++) {
 295                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 296                 channel->regs = chan_regs + i;
 297                 channel->block_regs = block_regs + (i >> 1);
 298                 channel->board_id = ipoctal->board_id;
 299                 if (i & 1) {
 300                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 301                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 302                 } else {
 303                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 304                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 305                 }
 306
 307                 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 308                 channel->rx_enable = 0;
 309                 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 310                 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 311                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 312                          &channel->regs->w.mr); /* mr1 */
 313                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 314                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 315         }
 316
 317         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 318                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 319                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 320                          &block_regs[i].w.opcr);
 321                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 322                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 323                          &block_regs[i].w.imr);
 324         }
 325
 326         /* Dummy write */
 327         iowrite8(1, ipoctal->mem8_space + 1);
 328
 329         /* Register the TTY device */
 330
 331         /* Each IP-OCTAL channel is a TTY port */
 332         tty = alloc_tty_driver(NR_CHANNELS);
 333
 334         if (!tty)
 335                 return -ENOMEM;
 336
 337         /* Fill struct tty_driver with ipoctal data */
 338         tty->owner = THIS_MODULE;
 339         tty->driver_name = KBUILD_MODNAME;
 340         sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
 341         tty->name = name;
 342         tty->major = 0;
 343
 344         tty->minor_start = 0;
 345         tty->type = TTY_DRIVER_TYPE_SERIAL;
 346         tty->subtype = SERIAL_TYPE_NORMAL;
 347         tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 348         tty->init_termios = tty_std_termios;
 349         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 350         tty->init_termios.c_ispeed = 9600;
 351         tty->init_termios.c_ospeed = 9600;
 352
 353         tty_set_operations(tty, &ipoctal_fops);
 354         res = tty_register_driver(tty);
 355         if (res) {
 356                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 357                 put_tty_driver(tty);
 358                 return res;
 359         }
 360
 361         /* Save struct tty_driver for use it when uninstalling the device */
 362         ipoctal->tty_drv = tty;
 363
 364         for (i = 0; i < NR_CHANNELS; i++) {
 365                 struct device *tty_dev;
 366
 367                 channel = &ipoctal->channel[i];
 368                 tty_port_init(&channel->tty_port);
 369                 tty_port_alloc_xmit_buf(&channel->tty_port);
 370                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 371
 372                 ipoctal_reset_stats(&channel->stats);
 373                 channel->nb_bytes = 0;
 374                 spin_lock_init(&channel->lock);
 375                 channel->pointer_read = 0;
 376                 channel->pointer_write = 0;
 377                 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
 378                 if (IS_ERR(tty_dev)) {
 379                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
 380                         tty_port_destroy(&channel->tty_port);
 381                         continue;
 382                 }
 383                 dev_set_drvdata(tty_dev, channel);
 384         }
 385
 386         /*
 387          * IP-OCTAL has different addresses to copy its IRQ vector.
 388          * Depending of the carrier these addresses are accesible or not.
 389          * More info in the datasheet.
 390          */
 391         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
 392                                        ipoctal_irq_handler, ipoctal);
 393
 394         return 0;
 395 }
 396
 397 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 398                                             const unsigned char *buf,
 399                                             int count)
 400 {
 401         unsigned long flags;
 402         int i;
 403         unsigned int *pointer_read = &channel->pointer_read;
 404
 405         /* Copy the bytes from the user buffer to the internal one */
 406         for (i = 0; i < count; i++) {
 407                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 408                         spin_lock_irqsave(&channel->lock, flags);
 409                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 410                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 411                         channel->nb_bytes++;
 412                         spin_unlock_irqrestore(&channel->lock, flags);
 413                 } else {
 414                         break;
 415                 }
 416         }
 417         return i;
 418 }
 419
 420 static int ipoctal_write_tty(struct tty_struct *tty,
 421                              const unsigned char *buf, int count)
 422 {
 423         struct ipoctal_channel *channel = tty->driver_data;
 424         unsigned int char_copied;
 425
 426         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
 427
 428         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 429         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 430                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 431                 channel->rx_enable = 0;
 432                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 433         }
 434
 435         /*
 436          * Send a packet and then disable TX to avoid failure after several send
 437          * operations
 438          */
 439         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 440         return char_copied;
 441 }
 442
 443 static int ipoctal_write_room(struct tty_struct *tty)
 444 {
 445         struct ipoctal_channel *channel = tty->driver_data;
 446
 447         return PAGE_SIZE - channel->nb_bytes;
 448 }
 449
 450 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
 451 {
 452         struct ipoctal_channel *channel = tty->driver_data;
 453
 454         return channel->nb_bytes;
 455 }
 456
 457 static void ipoctal_set_termios(struct tty_struct *tty,
 458                                 struct ktermios *old_termios)
 459 {
 460         unsigned int cflag;
 461         unsigned char mr1 = 0;
 462         unsigned char mr2 = 0;
 463         unsigned char csr = 0;
 464         struct ipoctal_channel *channel = tty->driver_data;
 465         speed_t baud;
 466
 467         cflag = tty->termios.c_cflag;
 468
 469         /* Disable and reset everything before change the setup */
 470         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 471         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 472         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 473         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 474         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 475
 476         /* Set Bits per chars */
 477         switch (cflag & CSIZE) {
 478         case CS6:
 479                 mr1 |= MR1_CHRL_6_BITS;
 480                 break;
 481         case CS7:
 482                 mr1 |= MR1_CHRL_7_BITS;
 483                 break;
 484         case CS8:
 485         default:
 486                 mr1 |= MR1_CHRL_8_BITS;
 487                 /* By default, select CS8 */
 488                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
 489                 break;
 490         }
 491
 492         /* Set Parity */
 493         if (cflag & PARENB)
 494                 if (cflag & PARODD)
 495                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 496                 else
 497                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 498         else
 499                 mr1 |= MR1_PARITY_OFF;
 500
 501         /* Mark or space parity is not supported */
 502         tty->termios.c_cflag &= ~CMSPAR;
 503
 504         /* Set stop bits */
 505         if (cflag & CSTOPB)
 506                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 507         else
 508                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 509
 510         /* Set the flow control */
 511         switch (channel->board_id) {
 512         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 513                 if (cflag & CRTSCTS) {
 514                         mr1 |= MR1_RxRTS_CONTROL_ON;
 515                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 516                 } else {
 517                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 518                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 519                 }
 520                 break;
 521         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 522                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 523                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 524                 break;
 525         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 526                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 527                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 528                 break;
 529         default:
 530                 return;
 531                 break;
 532         }
 533
 534         baud = tty_get_baud_rate(tty);
 535         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
 536
 537         /* Set baud rate */
 538         switch (baud) {
 539         case 75:
 540                 csr |= TX_CLK_75 | RX_CLK_75;
 541                 break;
 542         case 110:
 543                 csr |= TX_CLK_110 | RX_CLK_110;
 544                 break;
 545         case 150:
 546                 csr |= TX_CLK_150 | RX_CLK_150;
 547                 break;
 548         case 300:
 549                 csr |= TX_CLK_300 | RX_CLK_300;
 550                 break;
 551         case 600:
 552                 csr |= TX_CLK_600 | RX_CLK_600;
 553                 break;
 554         case 1200:
 555                 csr |= TX_CLK_1200 | RX_CLK_1200;
 556                 break;
 557         case 1800:
 558                 csr |= TX_CLK_1800 | RX_CLK_1800;
 559                 break;
 560         case 2000:
 561                 csr |= TX_CLK_2000 | RX_CLK_2000;
 562                 break;
 563         case 2400:
 564                 csr |= TX_CLK_2400 | RX_CLK_2400;
 565                 break;
 566         case 4800:
 567                 csr |= TX_CLK_4800  | RX_CLK_4800;
 568                 break;
 569         case 9600:
 570                 csr |= TX_CLK_9600  | RX_CLK_9600;
 571                 break;
 572         case 19200:
 573                 csr |= TX_CLK_19200 | RX_CLK_19200;
 574                 break;
 575         case 38400:
 576         default:
 577                 csr |= TX_CLK_38400 | RX_CLK_38400;
 578                 /* In case of default, we establish 38400 bps */
 579                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
 580                 break;
 581         }
 582
 583         mr1 |= MR1_ERROR_CHAR;
 584         mr1 |= MR1_RxINT_RxRDY;
 585
 586         /* Write the control registers */
 587         iowrite8(mr1, &channel->regs->w.mr);
 588         iowrite8(mr2, &channel->regs->w.mr);
 589         iowrite8(csr, &channel->regs->w.csr);
 590
 591         /* Enable again the RX, if it was before */
 592         if (channel->rx_enable)
 593                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 594 }
 595
 596 static void ipoctal_hangup(struct tty_struct *tty)
 597 {
 598         unsigned long flags;
 599         struct ipoctal_channel *channel = tty->driver_data;
 600
 601         if (channel == NULL)
 602                 return;
 603
 604         spin_lock_irqsave(&channel->lock, flags);
 605         channel->nb_bytes = 0;
 606         channel->pointer_read = 0;
 607         channel->pointer_write = 0;
 608         spin_unlock_irqrestore(&channel->lock, flags);
 609
 610         tty_port_hangup(&channel->tty_port);
 611
 612         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 613         channel->rx_enable = 0;
 614         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 615         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 616         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 617         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 618
 619         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 620         wake_up_interruptible(&channel->tty_port.open_wait);
 621 }
 622
 623 static void ipoctal_shutdown(struct tty_struct *tty)
 624 {
 625         struct ipoctal_channel *channel = tty->driver_data;
 626
 627         if (channel == NULL)
 628                 return;
 629
 630         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 631         channel->rx_enable = 0;
 632         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 633         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 634         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 635         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 636         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 637 }
 638
 639 static const struct tty_operations ipoctal_fops = {
 640         .ioctl =                NULL,
 641         .open =                 ipoctal_open,
 642         .close =                ipoctal_close,
 643         .write =                ipoctal_write_tty,
 644         .set_termios =          ipoctal_set_termios,
 645         .write_room =           ipoctal_write_room,
 646         .chars_in_buffer =      ipoctal_chars_in_buffer,
 647         .get_icount =           ipoctal_get_icount,
 648         .hangup =               ipoctal_hangup,
 649         .shutdown =             ipoctal_shutdown,
 650 };
 651
 652 static int ipoctal_probe(struct ipack_device *dev)
 653 {
 654         int res;
 655         struct ipoctal *ipoctal;
 656
 657         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
 658         if (ipoctal == NULL)
 659                 return -ENOMEM;
 660
 661         ipoctal->dev = dev;
 662         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
 663         if (res)
 664                 goto out_uninst;
 665
 666         dev_set_drvdata(&dev->dev, ipoctal);
 667         return 0;
 668
 669 out_uninst:
 670         kfree(ipoctal);
 671         return res;
 672 }
 673
 674 static void __ipoctal_remove(struct ipoctal *ipoctal)
 675 {
 676         int i;
 677
 678         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
 679
 680         for (i = 0; i < NR_CHANNELS; i++) {
 681                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 682                 tty_unregister_device(ipoctal->tty_drv, i);
 683                 tty_port_free_xmit_buf(&channel->tty_port);
 684                 tty_port_destroy(&channel->tty_port);
 685         }
 686
 687         tty_unregister_driver(ipoctal->tty_drv);
 688         put_tty_driver(ipoctal->tty_drv);
 689         kfree(ipoctal);
 690 }
 691
 692 static void ipoctal_remove(struct ipack_device *idev)
 693 {
 694         __ipoctal_remove(dev_get_drvdata(&idev->dev));
 695 }
 696
 697 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
 698         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 699                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
 700         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 701                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
 702         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 703                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
 704         { 0, },
 705 };
 706
 707 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
 708
 709 static const struct ipack_driver_ops ipoctal_drv_ops = {
 710         .probe  = ipoctal_probe,
 711         .remove = ipoctal_remove,
 712 };
 713
 714 static struct ipack_driver driver = {
 715         .ops      = &ipoctal_drv_ops,
 716         .id_table = ipoctal_ids,
 717 };
 718
 719 static int __init ipoctal_init(void)
 720 {
 721         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
 722 }
 723
 724 static void __exit ipoctal_exit(void)
 725 {
 726         ipack_driver_unregister(&driver);
 727 }
 728
 729 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
 730 MODULE_LICENSE("GPL");
 731
 732 module_init(ipoctal_init);
 733 module_exit(ipoctal_exit);