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