drivers/ipack/devices/ipoctal.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * driver for the GE IP-OCTAL boards
   4  *
   5  * Copyright (C) 2009-2012 CERN (www.cern.ch)
   6  * Author: Nicolas Serafini, EIC2 SA
   7  * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/module.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/sched.h>
  14 #include <linux/tty.h>
  15 #include <linux/serial.h>
  16 #include <linux/tty_flip.h>
  17 #include <linux/slab.h>
  18 #include <linux/io.h>
  19 #include <linux/ipack.h>
  20 #include "ipoctal.h"
  21 #include "scc2698.h"
  22
  23 #define IP_OCTAL_ID_SPACE_VECTOR    0x41
  24 #define IP_OCTAL_NB_BLOCKS          4
  25
  26 static const struct tty_operations ipoctal_fops;
  27
  28 struct ipoctal_channel {
  29         struct ipoctal_stats            stats;
  30         unsigned int                    nb_bytes;
  31         wait_queue_head_t               queue;
  32         spinlock_t                      lock;
  33         unsigned int                    pointer_read;
  34         unsigned int                    pointer_write;
  35         struct tty_port                 tty_port;
  36         bool                            tty_registered;
  37         union scc2698_channel __iomem   *regs;
  38         union scc2698_block __iomem     *block_regs;
  39         unsigned int                    board_id;
  40         u8                              isr_rx_rdy_mask;
  41         u8                              isr_tx_rdy_mask;
  42         unsigned int                    rx_enable;
  43 };
  44
  45 struct ipoctal {
  46         struct ipack_device             *dev;
  47         unsigned int                    board_id;
  48         struct ipoctal_channel          channel[NR_CHANNELS];
  49         struct tty_driver               *tty_drv;
  50         u8 __iomem                      *mem8_space;
  51         u8 __iomem                      *int_space;
  52 };
  53
  54 static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
  55                                               unsigned int index)
  56 {
  57         return container_of(chan, struct ipoctal, channel[index]);
  58 }
  59
  60 static void ipoctal_reset_channel(struct ipoctal_channel *channel)
  61 {
  62         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
  63         channel->rx_enable = 0;
  64         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
  65         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
  66         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
  67         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
  68 }
  69
  70 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
  71 {
  72         struct ipoctal_channel *channel;
  73
  74         channel = dev_get_drvdata(tty->dev);
  75
  76         /*
  77          * Enable RX. TX will be enabled when
  78          * there is something to send
  79          */
  80         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
  81         channel->rx_enable = 1;
  82         return 0;
  83 }
  84
  85 static int ipoctal_install(struct tty_driver *driver, struct tty_struct *tty)
  86 {
  87         struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
  88         struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
  89         int res;
  90
  91         if (!ipack_get_carrier(ipoctal->dev))
  92                 return -EBUSY;
  93
  94         res = tty_standard_install(driver, tty);
  95         if (res)
  96                 goto err_put_carrier;
  97
  98         tty->driver_data = channel;
  99
 100         return 0;
 101
 102 err_put_carrier:
 103         ipack_put_carrier(ipoctal->dev);
 104
 105         return res;
 106 }
 107
 108 static int ipoctal_open(struct tty_struct *tty, struct file *file)
 109 {
 110         struct ipoctal_channel *channel = tty->driver_data;
 111
 112         return tty_port_open(&channel->tty_port, tty, file);
 113 }
 114
 115 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
 116 {
 117         stats->tx = 0;
 118         stats->rx = 0;
 119         stats->rcv_break = 0;
 120         stats->framing_err = 0;
 121         stats->overrun_err = 0;
 122         stats->parity_err = 0;
 123 }
 124
 125 static void ipoctal_free_channel(struct ipoctal_channel *channel)
 126 {
 127         ipoctal_reset_stats(&channel->stats);
 128         channel->pointer_read = 0;
 129         channel->pointer_write = 0;
 130         channel->nb_bytes = 0;
 131 }
 132
 133 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
 134 {
 135         struct ipoctal_channel *channel = tty->driver_data;
 136
 137         tty_port_close(&channel->tty_port, tty, filp);
 138         ipoctal_free_channel(channel);
 139 }
 140
 141 static int ipoctal_get_icount(struct tty_struct *tty,
 142                               struct serial_icounter_struct *icount)
 143 {
 144         struct ipoctal_channel *channel = tty->driver_data;
 145
 146         icount->cts = 0;
 147         icount->dsr = 0;
 148         icount->rng = 0;
 149         icount->dcd = 0;
 150         icount->rx = channel->stats.rx;
 151         icount->tx = channel->stats.tx;
 152         icount->frame = channel->stats.framing_err;
 153         icount->parity = channel->stats.parity_err;
 154         icount->brk = channel->stats.rcv_break;
 155         return 0;
 156 }
 157
 158 static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
 159 {
 160         struct tty_port *port = &channel->tty_port;
 161         u8 isr, value, flag;
 162
 163         do {
 164                 value = ioread8(&channel->regs->r.rhr);
 165                 flag = TTY_NORMAL;
 166                 /* Error: count statistics */
 167                 if (sr & SR_ERROR) {
 168                         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
 169
 170                         if (sr & SR_OVERRUN_ERROR) {
 171                                 channel->stats.overrun_err++;
 172                                 /* Overrun doesn't affect the current character*/
 173                                 tty_insert_flip_char(port, 0, TTY_OVERRUN);
 174                         }
 175                         if (sr & SR_PARITY_ERROR) {
 176                                 channel->stats.parity_err++;
 177                                 flag = TTY_PARITY;
 178                         }
 179                         if (sr & SR_FRAMING_ERROR) {
 180                                 channel->stats.framing_err++;
 181                                 flag = TTY_FRAME;
 182                         }
 183                         if (sr & SR_RECEIVED_BREAK) {
 184                                 channel->stats.rcv_break++;
 185                                 flag = TTY_BREAK;
 186                         }
 187                 }
 188                 tty_insert_flip_char(port, value, flag);
 189
 190                 /* Check if there are more characters in RX FIFO
 191                  * If there are more, the isr register for this channel
 192                  * has enabled the RxRDY|FFULL bit.
 193                  */
 194                 isr = ioread8(&channel->block_regs->r.isr);
 195                 sr = ioread8(&channel->regs->r.sr);
 196         } while (isr & channel->isr_rx_rdy_mask);
 197
 198         tty_flip_buffer_push(port);
 199 }
 200
 201 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
 202 {
 203         unsigned int *pointer_write = &channel->pointer_write;
 204         u8 value;
 205
 206         if (channel->nb_bytes == 0)
 207                 return;
 208
 209         spin_lock(&channel->lock);
 210         value = channel->tty_port.xmit_buf[*pointer_write];
 211         iowrite8(value, &channel->regs->w.thr);
 212         channel->stats.tx++;
 213         (*pointer_write)++;
 214         *pointer_write = *pointer_write % PAGE_SIZE;
 215         channel->nb_bytes--;
 216         spin_unlock(&channel->lock);
 217 }
 218
 219 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
 220 {
 221         u8 isr, sr;
 222
 223         /* The HW is organized in pair of channels.  See which register we need
 224          * to read from */
 225         isr = ioread8(&channel->block_regs->r.isr);
 226         sr = ioread8(&channel->regs->r.sr);
 227
 228         if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B))
 229                 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
 230
 231         if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
 232                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 233                 /* In case of RS-485, change from TX to RX when finishing TX.
 234                  * Half-duplex. */
 235                 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 236                         iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
 237                         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 238                         channel->rx_enable = 1;
 239                 }
 240         }
 241
 242         /* RX data */
 243         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
 244                 ipoctal_irq_rx(channel, sr);
 245
 246         /* TX of each character */
 247         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
 248                 ipoctal_irq_tx(channel);
 249 }
 250
 251 static irqreturn_t ipoctal_irq_handler(void *arg)
 252 {
 253         unsigned int i;
 254         struct ipoctal *ipoctal = arg;
 255
 256         /* Clear the IPack device interrupt */
 257         readw(ipoctal->int_space + ACK_INT_REQ0);
 258         readw(ipoctal->int_space + ACK_INT_REQ1);
 259
 260         /* Check all channels */
 261         for (i = 0; i < NR_CHANNELS; i++)
 262                 ipoctal_irq_channel(&ipoctal->channel[i]);
 263
 264         return IRQ_HANDLED;
 265 }
 266
 267 static const struct tty_port_operations ipoctal_tty_port_ops = {
 268         .dtr_rts = NULL,
 269         .activate = ipoctal_port_activate,
 270 };
 271
 272 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 273                              unsigned int slot)
 274 {
 275         int res;
 276         int i;
 277         struct tty_driver *drv;
 278         struct ipoctal_channel *channel;
 279         struct ipack_region *region;
 280         void __iomem *addr;
 281         union scc2698_channel __iomem *chan_regs;
 282         union scc2698_block __iomem *block_regs;
 283
 284         ipoctal->board_id = ipoctal->dev->id_device;
 285
 286         region = &ipoctal->dev->region[IPACK_IO_SPACE];
 287         addr = devm_ioremap(&ipoctal->dev->dev,
 288                                     region->start, region->size);
 289         if (!addr) {
 290                 dev_err(&ipoctal->dev->dev,
 291                         "Unable to map slot [%d:%d] IO space!\n",
 292                         bus_nr, slot);
 293                 return -EADDRNOTAVAIL;
 294         }
 295         /* Save the virtual address to access the registers easily */
 296         chan_regs =
 297                 (union scc2698_channel __iomem *) addr;
 298         block_regs =
 299                 (union scc2698_block __iomem *) addr;
 300
 301         region = &ipoctal->dev->region[IPACK_INT_SPACE];
 302         ipoctal->int_space =
 303                 devm_ioremap(&ipoctal->dev->dev,
 304                                      region->start, region->size);
 305         if (!ipoctal->int_space) {
 306                 dev_err(&ipoctal->dev->dev,
 307                         "Unable to map slot [%d:%d] INT space!\n",
 308                         bus_nr, slot);
 309                 return -EADDRNOTAVAIL;
 310         }
 311
 312         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
 313         ipoctal->mem8_space =
 314                 devm_ioremap(&ipoctal->dev->dev,
 315                                      region->start, 0x8000);
 316         if (!ipoctal->mem8_space) {
 317                 dev_err(&ipoctal->dev->dev,
 318                         "Unable to map slot [%d:%d] MEM8 space!\n",
 319                         bus_nr, slot);
 320                 return -EADDRNOTAVAIL;
 321         }
 322
 323
 324         /* Disable RX and TX before touching anything */
 325         for (i = 0; i < NR_CHANNELS ; i++) {
 326                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 327                 channel->regs = chan_regs + i;
 328                 channel->block_regs = block_regs + (i >> 1);
 329                 channel->board_id = ipoctal->board_id;
 330                 if (i & 1) {
 331                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
 332                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
 333                 } else {
 334                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
 335                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
 336                 }
 337
 338                 ipoctal_reset_channel(channel);
 339                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
 340                          &channel->regs->w.mr); /* mr1 */
 341                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
 342                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
 343         }
 344
 345         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
 346                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
 347                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
 348                          &block_regs[i].w.opcr);
 349                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
 350                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
 351                          &block_regs[i].w.imr);
 352         }
 353
 354         /* Dummy write */
 355         iowrite8(1, ipoctal->mem8_space + 1);
 356
 357         /* Register the TTY device */
 358
 359         /* Each IP-OCTAL channel is a TTY port */
 360         drv = tty_alloc_driver(NR_CHANNELS, TTY_DRIVER_REAL_RAW |
 361                         TTY_DRIVER_DYNAMIC_DEV);
 362         if (IS_ERR(drv))
 363                 return PTR_ERR(drv);
 364
 365         /* Fill struct tty_driver with ipoctal data */
 366         drv->owner = THIS_MODULE;
 367         drv->driver_name = KBUILD_MODNAME;
 368         drv->name = kasprintf(GFP_KERNEL, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
 369         if (!drv->name) {
 370                 res = -ENOMEM;
 371                 goto err_put_driver;
 372         }
 373         drv->major = 0;
 374
 375         drv->minor_start = 0;
 376         drv->type = TTY_DRIVER_TYPE_SERIAL;
 377         drv->subtype = SERIAL_TYPE_NORMAL;
 378         drv->init_termios = tty_std_termios;
 379         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 380         drv->init_termios.c_ispeed = 9600;
 381         drv->init_termios.c_ospeed = 9600;
 382
 383         tty_set_operations(drv, &ipoctal_fops);
 384         res = tty_register_driver(drv);
 385         if (res) {
 386                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
 387                 goto err_free_name;
 388         }
 389
 390         /* Save struct tty_driver for use it when uninstalling the device */
 391         ipoctal->tty_drv = drv;
 392
 393         for (i = 0; i < NR_CHANNELS; i++) {
 394                 struct device *tty_dev;
 395
 396                 channel = &ipoctal->channel[i];
 397                 tty_port_init(&channel->tty_port);
 398                 res = tty_port_alloc_xmit_buf(&channel->tty_port);
 399                 if (res)
 400                         continue;
 401                 channel->tty_port.ops = &ipoctal_tty_port_ops;
 402
 403                 ipoctal_reset_stats(&channel->stats);
 404                 channel->nb_bytes = 0;
 405                 spin_lock_init(&channel->lock);
 406                 channel->pointer_read = 0;
 407                 channel->pointer_write = 0;
 408                 tty_dev = tty_port_register_device_attr(&channel->tty_port, drv,
 409                                                         i, NULL, channel, NULL);
 410                 if (IS_ERR(tty_dev)) {
 411                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
 412                         tty_port_free_xmit_buf(&channel->tty_port);
 413                         tty_port_destroy(&channel->tty_port);
 414                         continue;
 415                 }
 416                 channel->tty_registered = true;
 417         }
 418
 419         /*
 420          * IP-OCTAL has different addresses to copy its IRQ vector.
 421          * Depending of the carrier these addresses are accesible or not.
 422          * More info in the datasheet.
 423          */
 424         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
 425                                        ipoctal_irq_handler, ipoctal);
 426
 427         return 0;
 428
 429 err_free_name:
 430         kfree(drv->name);
 431 err_put_driver:
 432         tty_driver_kref_put(drv);
 433
 434         return res;
 435 }
 436
 437 static inline size_t ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
 438                                                const u8 *buf, size_t count)
 439 {
 440         unsigned long flags;
 441         size_t i;
 442         unsigned int *pointer_read = &channel->pointer_read;
 443
 444         /* Copy the bytes from the user buffer to the internal one */
 445         for (i = 0; i < count; i++) {
 446                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
 447                         spin_lock_irqsave(&channel->lock, flags);
 448                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
 449                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
 450                         channel->nb_bytes++;
 451                         spin_unlock_irqrestore(&channel->lock, flags);
 452                 } else {
 453                         break;
 454                 }
 455         }
 456         return i;
 457 }
 458
 459 static ssize_t ipoctal_write_tty(struct tty_struct *tty, const u8 *buf,
 460                                  size_t count)
 461 {
 462         struct ipoctal_channel *channel = tty->driver_data;
 463         size_t char_copied;
 464
 465         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
 466
 467         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
 468         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
 469                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
 470                 channel->rx_enable = 0;
 471                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
 472         }
 473
 474         /*
 475          * Send a packet and then disable TX to avoid failure after several send
 476          * operations
 477          */
 478         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
 479         return char_copied;
 480 }
 481
 482 static unsigned int ipoctal_write_room(struct tty_struct *tty)
 483 {
 484         struct ipoctal_channel *channel = tty->driver_data;
 485
 486         return PAGE_SIZE - channel->nb_bytes;
 487 }
 488
 489 static unsigned int ipoctal_chars_in_buffer(struct tty_struct *tty)
 490 {
 491         struct ipoctal_channel *channel = tty->driver_data;
 492
 493         return channel->nb_bytes;
 494 }
 495
 496 static void ipoctal_set_termios(struct tty_struct *tty,
 497                                 const struct ktermios *old_termios)
 498 {
 499         unsigned int cflag;
 500         unsigned char mr1 = 0;
 501         unsigned char mr2 = 0;
 502         unsigned char csr = 0;
 503         struct ipoctal_channel *channel = tty->driver_data;
 504         speed_t baud;
 505
 506         cflag = tty->termios.c_cflag;
 507
 508         /* Disable and reset everything before change the setup */
 509         ipoctal_reset_channel(channel);
 510
 511         /* Set Bits per chars */
 512         switch (cflag & CSIZE) {
 513         case CS6:
 514                 mr1 |= MR1_CHRL_6_BITS;
 515                 break;
 516         case CS7:
 517                 mr1 |= MR1_CHRL_7_BITS;
 518                 break;
 519         case CS8:
 520         default:
 521                 mr1 |= MR1_CHRL_8_BITS;
 522                 /* By default, select CS8 */
 523                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
 524                 break;
 525         }
 526
 527         /* Set Parity */
 528         if (cflag & PARENB)
 529                 if (cflag & PARODD)
 530                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
 531                 else
 532                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
 533         else
 534                 mr1 |= MR1_PARITY_OFF;
 535
 536         /* Mark or space parity is not supported */
 537         tty->termios.c_cflag &= ~CMSPAR;
 538
 539         /* Set stop bits */
 540         if (cflag & CSTOPB)
 541                 mr2 |= MR2_STOP_BITS_LENGTH_2;
 542         else
 543                 mr2 |= MR2_STOP_BITS_LENGTH_1;
 544
 545         /* Set the flow control */
 546         switch (channel->board_id) {
 547         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
 548                 if (cflag & CRTSCTS) {
 549                         mr1 |= MR1_RxRTS_CONTROL_ON;
 550                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
 551                 } else {
 552                         mr1 |= MR1_RxRTS_CONTROL_OFF;
 553                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 554                 }
 555                 break;
 556         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
 557                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 558                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
 559                 break;
 560         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
 561                 mr1 |= MR1_RxRTS_CONTROL_OFF;
 562                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
 563                 break;
 564         default:
 565                 return;
 566         }
 567
 568         baud = tty_get_baud_rate(tty);
 569         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
 570
 571         /* Set baud rate */
 572         switch (baud) {
 573         case 75:
 574                 csr |= TX_CLK_75 | RX_CLK_75;
 575                 break;
 576         case 110:
 577                 csr |= TX_CLK_110 | RX_CLK_110;
 578                 break;
 579         case 150:
 580                 csr |= TX_CLK_150 | RX_CLK_150;
 581                 break;
 582         case 300:
 583                 csr |= TX_CLK_300 | RX_CLK_300;
 584                 break;
 585         case 600:
 586                 csr |= TX_CLK_600 | RX_CLK_600;
 587                 break;
 588         case 1200:
 589                 csr |= TX_CLK_1200 | RX_CLK_1200;
 590                 break;
 591         case 1800:
 592                 csr |= TX_CLK_1800 | RX_CLK_1800;
 593                 break;
 594         case 2000:
 595                 csr |= TX_CLK_2000 | RX_CLK_2000;
 596                 break;
 597         case 2400:
 598                 csr |= TX_CLK_2400 | RX_CLK_2400;
 599                 break;
 600         case 4800:
 601                 csr |= TX_CLK_4800  | RX_CLK_4800;
 602                 break;
 603         case 9600:
 604                 csr |= TX_CLK_9600  | RX_CLK_9600;
 605                 break;
 606         case 19200:
 607                 csr |= TX_CLK_19200 | RX_CLK_19200;
 608                 break;
 609         case 38400:
 610         default:
 611                 csr |= TX_CLK_38400 | RX_CLK_38400;
 612                 /* In case of default, we establish 38400 bps */
 613                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
 614                 break;
 615         }
 616
 617         mr1 |= MR1_ERROR_CHAR;
 618         mr1 |= MR1_RxINT_RxRDY;
 619
 620         /* Write the control registers */
 621         iowrite8(mr1, &channel->regs->w.mr);
 622         iowrite8(mr2, &channel->regs->w.mr);
 623         iowrite8(csr, &channel->regs->w.csr);
 624
 625         /* Enable again the RX, if it was before */
 626         if (channel->rx_enable)
 627                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
 628 }
 629
 630 static void ipoctal_hangup(struct tty_struct *tty)
 631 {
 632         unsigned long flags;
 633         struct ipoctal_channel *channel = tty->driver_data;
 634
 635         if (channel == NULL)
 636                 return;
 637
 638         spin_lock_irqsave(&channel->lock, flags);
 639         channel->nb_bytes = 0;
 640         channel->pointer_read = 0;
 641         channel->pointer_write = 0;
 642         spin_unlock_irqrestore(&channel->lock, flags);
 643
 644         tty_port_hangup(&channel->tty_port);
 645
 646         ipoctal_reset_channel(channel);
 647         tty_port_set_initialized(&channel->tty_port, false);
 648         wake_up_interruptible(&channel->tty_port.open_wait);
 649 }
 650
 651 static void ipoctal_shutdown(struct tty_struct *tty)
 652 {
 653         struct ipoctal_channel *channel = tty->driver_data;
 654
 655         if (channel == NULL)
 656                 return;
 657
 658         ipoctal_reset_channel(channel);
 659         tty_port_set_initialized(&channel->tty_port, false);
 660 }
 661
 662 static void ipoctal_cleanup(struct tty_struct *tty)
 663 {
 664         struct ipoctal_channel *channel = tty->driver_data;
 665         struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
 666
 667         /* release the carrier driver */
 668         ipack_put_carrier(ipoctal->dev);
 669 }
 670
 671 static const struct tty_operations ipoctal_fops = {
 672         .ioctl =                NULL,
 673         .install =              ipoctal_install,
 674         .open =                 ipoctal_open,
 675         .close =                ipoctal_close,
 676         .write =                ipoctal_write_tty,
 677         .set_termios =          ipoctal_set_termios,
 678         .write_room =           ipoctal_write_room,
 679         .chars_in_buffer =      ipoctal_chars_in_buffer,
 680         .get_icount =           ipoctal_get_icount,
 681         .hangup =               ipoctal_hangup,
 682         .shutdown =             ipoctal_shutdown,
 683         .cleanup =              ipoctal_cleanup,
 684 };
 685
 686 static int ipoctal_probe(struct ipack_device *dev)
 687 {
 688         int res;
 689         struct ipoctal *ipoctal;
 690
 691         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
 692         if (ipoctal == NULL)
 693                 return -ENOMEM;
 694
 695         ipoctal->dev = dev;
 696         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
 697         if (res)
 698                 goto out_uninst;
 699
 700         dev_set_drvdata(&dev->dev, ipoctal);
 701         return 0;
 702
 703 out_uninst:
 704         kfree(ipoctal);
 705         return res;
 706 }
 707
 708 static void __ipoctal_remove(struct ipoctal *ipoctal)
 709 {
 710         int i;
 711
 712         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
 713
 714         for (i = 0; i < NR_CHANNELS; i++) {
 715                 struct ipoctal_channel *channel = &ipoctal->channel[i];
 716
 717                 if (!channel->tty_registered)
 718                         continue;
 719
 720                 tty_unregister_device(ipoctal->tty_drv, i);
 721                 tty_port_free_xmit_buf(&channel->tty_port);
 722                 tty_port_destroy(&channel->tty_port);
 723         }
 724
 725         tty_unregister_driver(ipoctal->tty_drv);
 726         kfree(ipoctal->tty_drv->name);
 727         tty_driver_kref_put(ipoctal->tty_drv);
 728         kfree(ipoctal);
 729 }
 730
 731 static void ipoctal_remove(struct ipack_device *idev)
 732 {
 733         __ipoctal_remove(dev_get_drvdata(&idev->dev));
 734 }
 735
 736 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
 737         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 738                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
 739         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 740                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
 741         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
 742                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
 743         { 0, },
 744 };
 745
 746 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
 747
 748 static const struct ipack_driver_ops ipoctal_drv_ops = {
 749         .probe  = ipoctal_probe,
 750         .remove = ipoctal_remove,
 751 };
 752
 753 static struct ipack_driver driver = {
 754         .ops      = &ipoctal_drv_ops,
 755         .id_table = ipoctal_ids,
 756 };
 757
 758 static int __init ipoctal_init(void)
 759 {
 760         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
 761 }
 762
 763 static void __exit ipoctal_exit(void)
 764 {
 765         ipack_driver_unregister(&driver);
 766 }
 767
 768 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
 769 MODULE_LICENSE("GPL");
 770
 771 module_init(ipoctal_init);
 772 module_exit(ipoctal_exit);