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 };
  47
  48 struct ipoctal {
  49         struct ipack_device             *dev;
  50         unsigned int                    board_id;
  51         struct ipoctal_channel          channel[NR_CHANNELS];
  52         struct tty_driver               *tty_drv;
  53         u8 __iomem                      *mem8_space;
  54         u8 __iomem                      *int_space;
  55 };
  56
  57 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
  58 {
  59         struct ipoctal_channel *channel;
  60
  61         channel = dev_get_drvdata(tty->dev);
  62
  63         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
  64         return 0;
  65 }
  66
  67 static int ipoctal_open(struct tty_struct *tty, struct file *file)
  68 {
  69         struct ipoctal_channel *channel;
  70
  71         channel = dev_get_drvdata(tty->dev);
  72         tty->driver_data = channel;
  73
  74         return tty_port_open(&channel->tty_port, tty, file);
  75 }
  76
  77 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
  78 {
  79         stats->tx = 0;
  80         stats->rx = 0;
  81         stats->rcv_break = 0;
  82         stats->framing_err = 0;
  83         stats->overrun_err = 0;
  84         stats->parity_err = 0;
  85 }
  86
  87 static void ipoctal_free_channel(struct ipoctal_channel *channel)
  88 {
  89         ipoctal_reset_stats(&channel->stats);
  90         channel->pointer_read = 0;
  91         channel->pointer_write = 0;
  92         channel->nb_bytes = 0;
  93 }
  94
  95 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
  96 {
  97         struct ipoctal_channel *channel = tty->driver_data;
  98
  99         tty_port_close(&channel->tty_port, tty, filp);
 100         ipoctal_free_channel(channel);
 101 }
 102
 103 static int ipoctal_get_icount(struct tty_struct *tty,
 104                               struct serial_icounter_struct *icount)
 105 {
 106         struct ipoctal_channel *channel = tty->driver_data;
 107
 108         icount->cts = 0;
 109         icount->dsr = 0;
 110         icount->rng = 0;
 111         icount->dcd = 0;
 112         icount->rx = channel->stats.rx;
 113         icount->tx = channel->stats.tx;
 114         icount->frame = channel->stats.framing_err;
 115         icount->parity = channel->stats.parity_err;
 116         icount->brk = channel->stats.rcv_break;
 117         return 0;
 118 }
 119
 120 static void ipoctal_irq_rx(struct ipoctal_channel *channel,
 121                            struct tty_struct *tty, u8 sr)
 122 {
 123         unsigned char value;
 124         unsigned char flag;
 125         u8 isr;
 126
 127         do {
 128                 value = ioread8(&channel->regs->r.rhr);
 129                 flag = TTY_NORMAL;
 130                 /* Error: count statistics */
 131                 if (sr & SR_ERROR) {
 132                         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 133
 134                         if (sr & SR_OVERRUN_ERROR) {
 135                                 channel->stats.overrun_err++;
 136                                 /* Overrun doesn't affect the current character*/
 137                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 138                         }
 139                         if (sr & SR_PARITY_ERROR) {
 140                                 channel->stats.parity_err++;
 141                                 flag = TTY_PARITY;
 142                         }
 143                         if (sr & SR_FRAMING_ERROR) {
 144                                 channel->stats.framing_err++;
 145                                 flag = TTY_FRAME;
 146                         }
 147                         if (sr & SR_RECEIVED_BREAK) {
 148                                 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
 149                                 channel->stats.rcv_break++;
 150                                 flag = TTY_BREAK;
 151                         }
 152                 }
 153                 tty_insert_flip_char(tty, value, flag);
 154
 155                 /* Check if there are more characters in RX FIFO
 156                  * If there are more, the isr register for this channel
 157                  * has enabled the RxRDY|FFULL bit.
 158                  */
 159                 isr = ioread8(&channel->block_regs->r.isr);
 160                 sr = ioread8(&channel->regs->r.sr);
 161         } while (isr & channel->isr_rx_rdy_mask);
 162
 163         tty_flip_buffer_push(tty);
 164 }
 165
 166 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
 167 {
 168         unsigned char value;
 169         unsigned int *pointer_write = &channel->pointer_write;
 170
 171         if (channel->nb_bytes == 0)
 172                 return;
 173
 174         value = channel->tty_port.xmit_buf[*pointer_write];
 175         iowrite8(value, &channel->regs->w.thr);
 176         channel->stats.tx++;
 177         (*pointer_write)++;
 178         *pointer_write = *pointer_write % PAGE_SIZE;
 179         channel->nb_bytes--;
 180
 181         if (channel->nb_bytes == 0 &&
 182             channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485)
 183                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 184 }
 185
 186 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
 187 {
 188         u8 isr, sr;
 189         struct tty_struct *tty;
 190
 191         tty = tty_port_tty_get(&channel->tty_port);
 192         if (!tty)
 193                 return;
 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         /* In case of RS-485, change from TX to RX when finishing TX.
 200          * Half-duplex. */
 201         if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) &&
 202             (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 203                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 204                 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 205                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 206                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 207         }
 208
 209         /* RX data */
 210         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 211                 ipoctal_irq_rx(channel, tty, sr);
 212
 213         /* TX of each character */
 214         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 215                 ipoctal_irq_tx(channel);
 216
 217         tty_flip_buffer_push(tty);
 218         tty_kref_put(tty);
 219 }
 220
 221 static irqreturn_t ipoctal_irq_handler(void *arg)
 222 {
 223         unsigned int i;
 224         struct ipoctal *ipoctal = (struct ipoctal *) arg;
 225
 226         /* Check all channels */
 227         for (i = 0; i < NR_CHANNELS; i++)
 228                 ipoctal_irq_channel(&ipoctal->channel[i]);
 229
 230         /* Clear the IPack device interrupt */
 231         readw(ipoctal->int_space + ACK_INT_REQ0);
 232         readw(ipoctal->int_space + ACK_INT_REQ1);
 233
 234         return IRQ_HANDLED;
 235 }
 236
 237 static const struct tty_port_operations ipoctal_tty_port_ops = {
 238         .dtr_rts = NULL,
 239         .activate = ipoctal_port_activate,
 240 };
 241
 242 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 243                              unsigned int slot)
 244 {
 245         int res;
 246         int i;
 247         struct tty_driver *tty;
 248         char name[20];
 249         struct ipoctal_channel *channel;
 250         struct ipack_region *region;
 251         void __iomem *addr;
 252         union scc2698_channel __iomem *chan_regs;
 253         union scc2698_block __iomem *block_regs;
 254
 255         ipoctal->board_id = ipoctal->dev->id_device;
 256
 257         region = &ipoctal->dev->region[IPACK_IO_SPACE];
 258         addr = devm_ioremap_nocache(&ipoctal->dev->dev,
 259                                     region->start, region->size);
 260         if (!addr) {
 261                 dev_err(&ipoctal->dev->dev,
 262                         "Unable to map slot [%d:%d] IO space!\n",
 263                         bus_nr, slot);
 264                 return -EADDRNOTAVAIL;
 265         }
 266         /* Save the virtual address to access the registers easily */
 267         chan_regs =
 268                 (union scc2698_channel __iomem *) addr;
 269         block_regs =
 270                 (union scc2698_block __iomem *) addr;
 271
 272         region = &ipoctal->dev->region[IPACK_INT_SPACE];
 273         ipoctal->int_space =
 274                 devm_ioremap_nocache(&ipoctal->dev->dev,
 275                                      region->start, region->size);
 276         if (!ipoctal->int_space) {
 277                 dev_err(&ipoctal->dev->dev,
 278                         "Unable to map slot [%d:%d] INT space!\n",
 279                         bus_nr, slot);
 280                 return -EADDRNOTAVAIL;
 281         }
 282
 283         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
 284         ipoctal->mem8_space =
 285                 devm_ioremap_nocache(&ipoctal->dev->dev,
 286                                      region->start, 0x8000);
 287         if (!addr) {
 288                 dev_err(&ipoctal->dev->dev,
 289                         "Unable to map slot [%d:%d] MEM8 space!\n",
 290                         bus_nr, slot);
 291                 return -EADDRNOTAVAIL;
 292         }
 293
 294
 295         /* Disable RX and TX before touching anything */
 296         for (i = 0; i < NR_CHANNELS ; i++) {
 297                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 298                 channel->regs = chan_regs + i;
 299                 channel->block_regs = block_regs + (i >> 1);
 300                 channel->board_id = ipoctal->board_id;
 301                 if (i & 1) {
 302                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 303                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 304                 } else {
 305                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 306                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 307                 }
 308
 309                 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 310                 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 311                 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 312                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 313                          &channel->regs->w.mr); /* mr1 */
 314                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 315                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 316         }
 317
 318         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 319                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 320                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 321                          &block_regs[i].w.opcr);
 322                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 323                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 324                          &block_regs[i].w.imr);
 325         }
 326
 327         /*
 328          * IP-OCTAL has different addresses to copy its IRQ vector.
 329          * Depending of the carrier these addresses are accesible or not.
 330          * More info in the datasheet.
 331          */
 332         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
 333                                        ipoctal_irq_handler, ipoctal);
 334         /* Dummy write */
 335         iowrite8(1, ipoctal->mem8_space + 1);
 336
 337         /* Register the TTY device */
 338
 339         /* Each IP-OCTAL channel is a TTY port */
 340         tty = alloc_tty_driver(NR_CHANNELS);
 341
 342         if (!tty)
 343                 return -ENOMEM;
 344
 345         /* Fill struct tty_driver with ipoctal data */
 346         tty->owner = THIS_MODULE;
 347         tty->driver_name = KBUILD_MODNAME;
 348         sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
 349         tty->name = name;
 350         tty->major = 0;
 351
 352         tty->minor_start = 0;
 353         tty->type = TTY_DRIVER_TYPE_SERIAL;
 354         tty->subtype = SERIAL_TYPE_NORMAL;
 355         tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 356         tty->init_termios = tty_std_termios;
 357         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 358         tty->init_termios.c_ispeed = 9600;
 359         tty->init_termios.c_ospeed = 9600;
 360
 361         tty_set_operations(tty, &ipoctal_fops);
 362         res = tty_register_driver(tty);
 363         if (res) {
 364                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 365                 put_tty_driver(tty);
 366                 return res;
 367         }
 368
 369         /* Save struct tty_driver for use it when uninstalling the device */
 370         ipoctal->tty_drv = tty;
 371
 372         for (i = 0; i < NR_CHANNELS; i++) {
 373                 struct device *tty_dev;
 374
 375                 channel = &ipoctal->channel[i];
 376                 tty_port_init(&channel->tty_port);
 377                 tty_port_alloc_xmit_buf(&channel->tty_port);
 378                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 379
 380                 ipoctal_reset_stats(&channel->stats);
 381                 channel->nb_bytes = 0;
 382                 spin_lock_init(&channel->lock);
 383                 channel->pointer_read = 0;
 384                 channel->pointer_write = 0;
 385                 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
 386                 if (IS_ERR(tty_dev)) {
 387                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
 388                         tty_port_destroy(&channel->tty_port);
 389                         continue;
 390                 }
 391                 dev_set_drvdata(tty_dev, channel);
 392
 393                 /*
 394                  * Enable again the RX. TX will be enabled when
 395                  * there is something to send
 396                  */
 397                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 398         }
 399
 400         return 0;
 401 }
 402
 403 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 404                                             const unsigned char *buf,
 405                                             int count)
 406 {
 407         unsigned long flags;
 408         int i;
 409         unsigned int *pointer_read = &channel->pointer_read;
 410
 411         /* Copy the bytes from the user buffer to the internal one */
 412         for (i = 0; i < count; i++) {
 413                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 414                         spin_lock_irqsave(&channel->lock, flags);
 415                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 416                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 417                         channel->nb_bytes++;
 418                         spin_unlock_irqrestore(&channel->lock, flags);
 419                 } else {
 420                         break;
 421                 }
 422         }
 423         return i;
 424 }
 425
 426 static int ipoctal_write_tty(struct tty_struct *tty,
 427                              const unsigned char *buf, int count)
 428 {
 429         struct ipoctal_channel *channel = tty->driver_data;
 430         unsigned int char_copied;
 431
 432         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
 433
 434         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 435         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 436                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 437                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 438         }
 439
 440         /*
 441          * Send a packet and then disable TX to avoid failure after several send
 442          * operations
 443          */
 444         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 445         return char_copied;
 446 }
 447
 448 static int ipoctal_write_room(struct tty_struct *tty)
 449 {
 450         struct ipoctal_channel *channel = tty->driver_data;
 451
 452         return PAGE_SIZE - channel->nb_bytes;
 453 }
 454
 455 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
 456 {
 457         struct ipoctal_channel *channel = tty->driver_data;
 458
 459         return channel->nb_bytes;
 460 }
 461
 462 static void ipoctal_set_termios(struct tty_struct *tty,
 463                                 struct ktermios *old_termios)
 464 {
 465         unsigned int cflag;
 466         unsigned char mr1 = 0;
 467         unsigned char mr2 = 0;
 468         unsigned char csr = 0;
 469         struct ipoctal_channel *channel = tty->driver_data;
 470         speed_t baud;
 471
 472         cflag = tty->termios.c_cflag;
 473
 474         /* Disable and reset everything before change the setup */
 475         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 476         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 477         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 478         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 479         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 480
 481         /* Set Bits per chars */
 482         switch (cflag & CSIZE) {
 483         case CS6:
 484                 mr1 |= MR1_CHRL_6_BITS;
 485                 break;
 486         case CS7:
 487                 mr1 |= MR1_CHRL_7_BITS;
 488                 break;
 489         case CS8:
 490         default:
 491                 mr1 |= MR1_CHRL_8_BITS;
 492                 /* By default, select CS8 */
 493                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
 494                 break;
 495         }
 496
 497         /* Set Parity */
 498         if (cflag & PARENB)
 499                 if (cflag & PARODD)
 500                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 501                 else
 502                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 503         else
 504                 mr1 |= MR1_PARITY_OFF;
 505
 506         /* Mark or space parity is not supported */
 507         tty->termios.c_cflag &= ~CMSPAR;
 508
 509         /* Set stop bits */
 510         if (cflag & CSTOPB)
 511                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 512         else
 513                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 514
 515         /* Set the flow control */
 516         switch (channel->board_id) {
 517         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 518                 if (cflag & CRTSCTS) {
 519                         mr1 |= MR1_RxRTS_CONTROL_ON;
 520                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 521                 } else {
 522                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 523                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 524                 }
 525                 break;
 526         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 527                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 528                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 529                 break;
 530         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 531                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 532                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 533                 break;
 534         default:
 535                 return;
 536                 break;
 537         }
 538
 539         baud = tty_get_baud_rate(tty);
 540         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
 541
 542         /* Set baud rate */
 543         switch (baud) {
 544         case 75:
 545                 csr |= TX_CLK_75 | RX_CLK_75;
 546                 break;
 547         case 110:
 548                 csr |= TX_CLK_110 | RX_CLK_110;
 549                 break;
 550         case 150:
 551                 csr |= TX_CLK_150 | RX_CLK_150;
 552                 break;
 553         case 300:
 554                 csr |= TX_CLK_300 | RX_CLK_300;
 555                 break;
 556         case 600:
 557                 csr |= TX_CLK_600 | RX_CLK_600;
 558                 break;
 559         case 1200:
 560                 csr |= TX_CLK_1200 | RX_CLK_1200;
 561                 break;
 562         case 1800:
 563                 csr |= TX_CLK_1800 | RX_CLK_1800;
 564                 break;
 565         case 2000:
 566                 csr |= TX_CLK_2000 | RX_CLK_2000;
 567                 break;
 568         case 2400:
 569                 csr |= TX_CLK_2400 | RX_CLK_2400;
 570                 break;
 571         case 4800:
 572                 csr |= TX_CLK_4800  | RX_CLK_4800;
 573                 break;
 574         case 9600:
 575                 csr |= TX_CLK_9600  | RX_CLK_9600;
 576                 break;
 577         case 19200:
 578                 csr |= TX_CLK_19200 | RX_CLK_19200;
 579                 break;
 580         case 38400:
 581         default:
 582                 csr |= TX_CLK_38400 | RX_CLK_38400;
 583                 /* In case of default, we establish 38400 bps */
 584                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
 585                 break;
 586         }
 587
 588         mr1 |= MR1_ERROR_CHAR;
 589         mr1 |= MR1_RxINT_RxRDY;
 590
 591         /* Write the control registers */
 592         iowrite8(mr1, &channel->regs->w.mr);
 593         iowrite8(mr2, &channel->regs->w.mr);
 594         iowrite8(csr, &channel->regs->w.csr);
 595
 596         /* Enable again the RX */
 597         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 598 }
 599
 600 static void ipoctal_hangup(struct tty_struct *tty)
 601 {
 602         unsigned long flags;
 603         struct ipoctal_channel *channel = tty->driver_data;
 604
 605         if (channel == NULL)
 606                 return;
 607
 608         spin_lock_irqsave(&channel->lock, flags);
 609         channel->nb_bytes = 0;
 610         channel->pointer_read = 0;
 611         channel->pointer_write = 0;
 612         spin_unlock_irqrestore(&channel->lock, flags);
 613
 614         tty_port_hangup(&channel->tty_port);
 615
 616         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
 617         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
 618         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
 619         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 620         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
 621
 622         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
 623         wake_up_interruptible(&channel->tty_port.open_wait);
 624 }
 625
 626 static const struct tty_operations ipoctal_fops = {
 627         .ioctl =                NULL,
 628         .open =                 ipoctal_open,
 629         .close =                ipoctal_close,
 630         .write =                ipoctal_write_tty,
 631         .set_termios =          ipoctal_set_termios,
 632         .write_room =           ipoctal_write_room,
 633         .chars_in_buffer =      ipoctal_chars_in_buffer,
 634         .get_icount =           ipoctal_get_icount,
 635         .hangup =               ipoctal_hangup,
 636 };
 637
 638 static int ipoctal_probe(struct ipack_device *dev)
 639 {
 640         int res;
 641         struct ipoctal *ipoctal;
 642
 643         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
 644         if (ipoctal == NULL)
 645                 return -ENOMEM;
 646
 647         ipoctal->dev = dev;
 648         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
 649         if (res)
 650                 goto out_uninst;
 651
 652         dev_set_drvdata(&dev->dev, ipoctal);
 653         return 0;
 654
 655 out_uninst:
 656         kfree(ipoctal);
 657         return res;
 658 }
 659
 660 static void __ipoctal_remove(struct ipoctal *ipoctal)
 661 {
 662         int i;
 663
 664         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
 665
 666         for (i = 0; i < NR_CHANNELS; i++) {
 667                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 668                 tty_unregister_device(ipoctal->tty_drv, i);
 669                 tty_port_free_xmit_buf(&channel->tty_port);
 670                 tty_port_destroy(&channel->tty_port);
 671         }
 672
 673         tty_unregister_driver(ipoctal->tty_drv);
 674         put_tty_driver(ipoctal->tty_drv);
 675         kfree(ipoctal);
 676 }
 677
 678 static void ipoctal_remove(struct ipack_device *idev)
 679 {
 680         __ipoctal_remove(dev_get_drvdata(&idev->dev));
 681 }
 682
 683 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
 684         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 685                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
 686         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 687                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
 688         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 689                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
 690         { 0, },
 691 };
 692
 693 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
 694
 695 static const struct ipack_driver_ops ipoctal_drv_ops = {
 696         .probe  = ipoctal_probe,
 697         .remove = ipoctal_remove,
 698 };
 699
 700 static struct ipack_driver driver = {
 701         .ops      = &ipoctal_drv_ops,
 702         .id_table = ipoctal_ids,
 703 };
 704
 705 static int __init ipoctal_init(void)
 706 {
 707         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
 708 }
 709
 710 static void __exit ipoctal_exit(void)
 711 {
 712         ipack_driver_unregister(&driver);
 713 }
 714
 715 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
 716 MODULE_LICENSE("GPL");
 717
 718 module_init(ipoctal_init);
 719 module_exit(ipoctal_exit);