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 struct tty_port *port = &channel->tty_port; 140 unsigned char value; 141 unsigned char flag = TTY_NORMAL; 142 u8 isr; 143 144 do { 145 value = ioread8(&channel->regs->r.rhr); 146 /* Error: count statistics */ 147 if (sr & SR_ERROR) { 148 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); 149 150 if (sr & SR_OVERRUN_ERROR) { 151 channel->stats.overrun_err++; 152 /* Overrun doesn't affect the current character*/ 153 tty_insert_flip_char(port, 0, TTY_OVERRUN); 154 } 155 if (sr & SR_PARITY_ERROR) { 156 channel->stats.parity_err++; 157 flag = TTY_PARITY; 158 } 159 if (sr & SR_FRAMING_ERROR) { 160 channel->stats.framing_err++; 161 flag = TTY_FRAME; 162 } 163 if (sr & SR_RECEIVED_BREAK) { 164 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr); 165 channel->stats.rcv_break++; 166 flag = TTY_BREAK; 167 } 168 } 169 tty_insert_flip_char(port, value, flag); 170 171 /* Check if there are more characters in RX FIFO 172 * If there are more, the isr register for this channel 173 * has enabled the RxRDY|FFULL bit. 174 */ 175 isr = ioread8(&channel->block_regs->r.isr); 176 sr = ioread8(&channel->regs->r.sr); 177 } while (isr & channel->isr_rx_rdy_mask); 178 179 tty_flip_buffer_push(tty); 180 } 181 182 static void ipoctal_irq_tx(struct ipoctal_channel *channel) 183 { 184 unsigned char value; 185 unsigned int *pointer_write = &channel->pointer_write; 186 187 if (channel->nb_bytes <= 0) { 188 channel->nb_bytes = 0; 189 return; 190 } 191 192 value = channel->tty_port.xmit_buf[*pointer_write]; 193 iowrite8(value, &channel->regs->w.thr); 194 channel->stats.tx++; 195 (*pointer_write)++; 196 *pointer_write = *pointer_write % PAGE_SIZE; 197 channel->nb_bytes--; 198 199 if ((channel->nb_bytes == 0) && 200 (waitqueue_active(&channel->queue))) { 201 202 if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) { 203 *channel->board_write = 1; 204 wake_up_interruptible(&channel->queue); 205 } 206 } 207 } 208 209 static void ipoctal_irq_channel(struct ipoctal_channel *channel) 210 { 211 u8 isr, sr; 212 struct tty_struct *tty; 213 214 /* If there is no client, skip the check */ 215 if (!atomic_read(&channel->open)) 216 return; 217 218 tty = tty_port_tty_get(&channel->tty_port); 219 if (!tty) 220 return; 221 /* The HW is organized in pair of channels. See which register we need 222 * to read from */ 223 isr = ioread8(&channel->block_regs->r.isr); 224 sr = ioread8(&channel->regs->r.sr); 225 226 /* In case of RS-485, change from TX to RX when finishing TX. 227 * Half-duplex. */ 228 if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) && 229 (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) { 230 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr); 231 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr); 232 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 233 *channel->board_write = 1; 234 wake_up_interruptible(&channel->queue); 235 } 236 237 /* RX data */ 238 if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY)) 239 ipoctal_irq_rx(channel, tty, sr); 240 241 /* TX of each character */ 242 if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY)) 243 ipoctal_irq_tx(channel); 244 245 tty_flip_buffer_push(tty); 246 tty_kref_put(tty); 247 } 248 249 static irqreturn_t ipoctal_irq_handler(void *arg) 250 { 251 unsigned int i; 252 struct ipoctal *ipoctal = (struct ipoctal *) arg; 253 254 /* Check all channels */ 255 for (i = 0; i < NR_CHANNELS; i++) 256 ipoctal_irq_channel(&ipoctal->channel[i]); 257 258 /* Clear the IPack device interrupt */ 259 readw(ipoctal->int_space + ACK_INT_REQ0); 260 readw(ipoctal->int_space + ACK_INT_REQ1); 261 262 return IRQ_HANDLED; 263 } 264 265 static const struct tty_port_operations ipoctal_tty_port_ops = { 266 .dtr_rts = NULL, 267 .activate = ipoctal_port_activate, 268 }; 269 270 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, 271 unsigned int slot) 272 { 273 int res; 274 int i; 275 struct tty_driver *tty; 276 char name[20]; 277 struct ipoctal_channel *channel; 278 struct ipack_region *region; 279 void __iomem *addr; 280 union scc2698_channel __iomem *chan_regs; 281 union scc2698_block __iomem *block_regs; 282 283 ipoctal->board_id = ipoctal->dev->id_device; 284 285 region = &ipoctal->dev->region[IPACK_IO_SPACE]; 286 addr = devm_ioremap_nocache(&ipoctal->dev->dev, 287 region->start, region->size); 288 if (!addr) { 289 dev_err(&ipoctal->dev->dev, 290 "Unable to map slot [%d:%d] IO space!\n", 291 bus_nr, slot); 292 return -EADDRNOTAVAIL; 293 } 294 /* Save the virtual address to access the registers easily */ 295 chan_regs = 296 (union scc2698_channel __iomem *) addr; 297 block_regs = 298 (union scc2698_block __iomem *) addr; 299 300 region = &ipoctal->dev->region[IPACK_INT_SPACE]; 301 ipoctal->int_space = 302 devm_ioremap_nocache(&ipoctal->dev->dev, 303 region->start, region->size); 304 if (!ipoctal->int_space) { 305 dev_err(&ipoctal->dev->dev, 306 "Unable to map slot [%d:%d] INT space!\n", 307 bus_nr, slot); 308 return -EADDRNOTAVAIL; 309 } 310 311 region = &ipoctal->dev->region[IPACK_MEM8_SPACE]; 312 ipoctal->mem8_space = 313 devm_ioremap_nocache(&ipoctal->dev->dev, 314 region->start, 0x8000); 315 if (!addr) { 316 dev_err(&ipoctal->dev->dev, 317 "Unable to map slot [%d:%d] MEM8 space!\n", 318 bus_nr, slot); 319 return -EADDRNOTAVAIL; 320 } 321 322 323 /* Disable RX and TX before touching anything */ 324 for (i = 0; i < NR_CHANNELS ; i++) { 325 struct ipoctal_channel *channel = &ipoctal->channel[i]; 326 channel->regs = chan_regs + i; 327 channel->block_regs = block_regs + (i >> 1); 328 channel->board_write = &ipoctal->write; 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 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); 339 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); 340 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); 341 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY, 342 &channel->regs->w.mr); /* mr1 */ 343 iowrite8(0, &channel->regs->w.mr); /* mr2 */ 344 iowrite8(TX_CLK_9600 | RX_CLK_9600, &channel->regs->w.csr); 345 } 346 347 for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) { 348 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr); 349 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN, 350 &block_regs[i].w.opcr); 351 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A | 352 IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B, 353 &block_regs[i].w.imr); 354 } 355 356 /* 357 * IP-OCTAL has different addresses to copy its IRQ vector. 358 * Depending of the carrier these addresses are accesible or not. 359 * More info in the datasheet. 360 */ 361 ipoctal->dev->bus->ops->request_irq(ipoctal->dev, 362 ipoctal_irq_handler, ipoctal); 363 /* Dummy write */ 364 iowrite8(1, ipoctal->mem8_space + 1); 365 366 /* Register the TTY device */ 367 368 /* Each IP-OCTAL channel is a TTY port */ 369 tty = alloc_tty_driver(NR_CHANNELS); 370 371 if (!tty) 372 return -ENOMEM; 373 374 /* Fill struct tty_driver with ipoctal data */ 375 tty->owner = THIS_MODULE; 376 tty->driver_name = KBUILD_MODNAME; 377 sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot); 378 tty->name = name; 379 tty->major = 0; 380 381 tty->minor_start = 0; 382 tty->type = TTY_DRIVER_TYPE_SERIAL; 383 tty->subtype = SERIAL_TYPE_NORMAL; 384 tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 385 tty->init_termios = tty_std_termios; 386 tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 387 tty->init_termios.c_ispeed = 9600; 388 tty->init_termios.c_ospeed = 9600; 389 390 tty_set_operations(tty, &ipoctal_fops); 391 res = tty_register_driver(tty); 392 if (res) { 393 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n"); 394 put_tty_driver(tty); 395 return res; 396 } 397 398 /* Save struct tty_driver for use it when uninstalling the device */ 399 ipoctal->tty_drv = tty; 400 401 for (i = 0; i < NR_CHANNELS; i++) { 402 struct device *tty_dev; 403 404 channel = &ipoctal->channel[i]; 405 tty_port_init(&channel->tty_port); 406 tty_port_alloc_xmit_buf(&channel->tty_port); 407 channel->tty_port.ops = &ipoctal_tty_port_ops; 408 409 ipoctal_reset_stats(&channel->stats); 410 channel->nb_bytes = 0; 411 init_waitqueue_head(&channel->queue); 412 413 spin_lock_init(&channel->lock); 414 channel->pointer_read = 0; 415 channel->pointer_write = 0; 416 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL); 417 if (IS_ERR(tty_dev)) { 418 dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n"); 419 tty_port_destroy(&channel->tty_port); 420 continue; 421 } 422 dev_set_drvdata(tty_dev, channel); 423 424 /* 425 * Enable again the RX. TX will be enabled when 426 * there is something to send 427 */ 428 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 429 } 430 431 return 0; 432 } 433 434 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel, 435 const unsigned char *buf, 436 int count) 437 { 438 unsigned long flags; 439 int i; 440 unsigned int *pointer_read = &channel->pointer_read; 441 442 /* Copy the bytes from the user buffer to the internal one */ 443 for (i = 0; i < count; i++) { 444 if (i <= (PAGE_SIZE - channel->nb_bytes)) { 445 spin_lock_irqsave(&channel->lock, flags); 446 channel->tty_port.xmit_buf[*pointer_read] = buf[i]; 447 *pointer_read = (*pointer_read + 1) % PAGE_SIZE; 448 channel->nb_bytes++; 449 spin_unlock_irqrestore(&channel->lock, flags); 450 } else { 451 break; 452 } 453 } 454 return i; 455 } 456 457 static int ipoctal_write_tty(struct tty_struct *tty, 458 const unsigned char *buf, int count) 459 { 460 struct ipoctal_channel *channel = tty->driver_data; 461 unsigned int char_copied; 462 463 char_copied = ipoctal_copy_write_buffer(channel, buf, count); 464 465 /* As the IP-OCTAL 485 only supports half duplex, do it manually */ 466 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) { 467 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr); 468 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr); 469 } 470 471 /* 472 * Send a packet and then disable TX to avoid failure after several send 473 * operations 474 */ 475 iowrite8(CR_ENABLE_TX, &channel->regs->w.cr); 476 wait_event_interruptible(channel->queue, *channel->board_write); 477 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr); 478 479 *channel->board_write = 0; 480 return char_copied; 481 } 482 483 static int ipoctal_write_room(struct tty_struct *tty) 484 { 485 struct ipoctal_channel *channel = tty->driver_data; 486 487 return PAGE_SIZE - channel->nb_bytes; 488 } 489 490 static int ipoctal_chars_in_buffer(struct tty_struct *tty) 491 { 492 struct ipoctal_channel *channel = tty->driver_data; 493 494 return channel->nb_bytes; 495 } 496 497 static void ipoctal_set_termios(struct tty_struct *tty, 498 struct ktermios *old_termios) 499 { 500 unsigned int cflag; 501 unsigned char mr1 = 0; 502 unsigned char mr2 = 0; 503 unsigned char csr = 0; 504 struct ipoctal_channel *channel = tty->driver_data; 505 speed_t baud; 506 507 cflag = tty->termios.c_cflag; 508 509 /* Disable and reset everything before change the setup */ 510 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); 511 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); 512 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); 513 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); 514 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); 515 516 /* Set Bits per chars */ 517 switch (cflag & CSIZE) { 518 case CS6: 519 mr1 |= MR1_CHRL_6_BITS; 520 break; 521 case CS7: 522 mr1 |= MR1_CHRL_7_BITS; 523 break; 524 case CS8: 525 default: 526 mr1 |= MR1_CHRL_8_BITS; 527 /* By default, select CS8 */ 528 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8; 529 break; 530 } 531 532 /* Set Parity */ 533 if (cflag & PARENB) 534 if (cflag & PARODD) 535 mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD; 536 else 537 mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN; 538 else 539 mr1 |= MR1_PARITY_OFF; 540 541 /* Mark or space parity is not supported */ 542 tty->termios.c_cflag &= ~CMSPAR; 543 544 /* Set stop bits */ 545 if (cflag & CSTOPB) 546 mr2 |= MR2_STOP_BITS_LENGTH_2; 547 else 548 mr2 |= MR2_STOP_BITS_LENGTH_1; 549 550 /* Set the flow control */ 551 switch (channel->board_id) { 552 case IPACK1_DEVICE_ID_SBS_OCTAL_232: 553 if (cflag & CRTSCTS) { 554 mr1 |= MR1_RxRTS_CONTROL_ON; 555 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON; 556 } else { 557 mr1 |= MR1_RxRTS_CONTROL_OFF; 558 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF; 559 } 560 break; 561 case IPACK1_DEVICE_ID_SBS_OCTAL_422: 562 mr1 |= MR1_RxRTS_CONTROL_OFF; 563 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF; 564 break; 565 case IPACK1_DEVICE_ID_SBS_OCTAL_485: 566 mr1 |= MR1_RxRTS_CONTROL_OFF; 567 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF; 568 break; 569 default: 570 return; 571 break; 572 } 573 574 baud = tty_get_baud_rate(tty); 575 tty_termios_encode_baud_rate(&tty->termios, baud, baud); 576 577 /* Set baud rate */ 578 switch (baud) { 579 case 75: 580 csr |= TX_CLK_75 | RX_CLK_75; 581 break; 582 case 110: 583 csr |= TX_CLK_110 | RX_CLK_110; 584 break; 585 case 150: 586 csr |= TX_CLK_150 | RX_CLK_150; 587 break; 588 case 300: 589 csr |= TX_CLK_300 | RX_CLK_300; 590 break; 591 case 600: 592 csr |= TX_CLK_600 | RX_CLK_600; 593 break; 594 case 1200: 595 csr |= TX_CLK_1200 | RX_CLK_1200; 596 break; 597 case 1800: 598 csr |= TX_CLK_1800 | RX_CLK_1800; 599 break; 600 case 2000: 601 csr |= TX_CLK_2000 | RX_CLK_2000; 602 break; 603 case 2400: 604 csr |= TX_CLK_2400 | RX_CLK_2400; 605 break; 606 case 4800: 607 csr |= TX_CLK_4800 | RX_CLK_4800; 608 break; 609 case 9600: 610 csr |= TX_CLK_9600 | RX_CLK_9600; 611 break; 612 case 19200: 613 csr |= TX_CLK_19200 | RX_CLK_19200; 614 break; 615 case 38400: 616 default: 617 csr |= TX_CLK_38400 | RX_CLK_38400; 618 /* In case of default, we establish 38400 bps */ 619 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400); 620 break; 621 } 622 623 mr1 |= MR1_ERROR_CHAR; 624 mr1 |= MR1_RxINT_RxRDY; 625 626 /* Write the control registers */ 627 iowrite8(mr1, &channel->regs->w.mr); 628 iowrite8(mr2, &channel->regs->w.mr); 629 iowrite8(csr, &channel->regs->w.csr); 630 631 /* Enable again the RX */ 632 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 633 } 634 635 static void ipoctal_hangup(struct tty_struct *tty) 636 { 637 unsigned long flags; 638 struct ipoctal_channel *channel = tty->driver_data; 639 640 if (channel == NULL) 641 return; 642 643 spin_lock_irqsave(&channel->lock, flags); 644 channel->nb_bytes = 0; 645 channel->pointer_read = 0; 646 channel->pointer_write = 0; 647 spin_unlock_irqrestore(&channel->lock, flags); 648 649 tty_port_hangup(&channel->tty_port); 650 651 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); 652 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); 653 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); 654 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); 655 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); 656 657 clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags); 658 wake_up_interruptible(&channel->tty_port.open_wait); 659 } 660 661 static const struct tty_operations ipoctal_fops = { 662 .ioctl = NULL, 663 .open = ipoctal_open, 664 .close = ipoctal_close, 665 .write = ipoctal_write_tty, 666 .set_termios = ipoctal_set_termios, 667 .write_room = ipoctal_write_room, 668 .chars_in_buffer = ipoctal_chars_in_buffer, 669 .get_icount = ipoctal_get_icount, 670 .hangup = ipoctal_hangup, 671 }; 672 673 static int ipoctal_probe(struct ipack_device *dev) 674 { 675 int res; 676 struct ipoctal *ipoctal; 677 678 ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL); 679 if (ipoctal == NULL) 680 return -ENOMEM; 681 682 ipoctal->dev = dev; 683 res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot); 684 if (res) 685 goto out_uninst; 686 687 dev_set_drvdata(&dev->dev, ipoctal); 688 return 0; 689 690 out_uninst: 691 kfree(ipoctal); 692 return res; 693 } 694 695 static void __ipoctal_remove(struct ipoctal *ipoctal) 696 { 697 int i; 698 699 ipoctal->dev->bus->ops->free_irq(ipoctal->dev); 700 701 for (i = 0; i < NR_CHANNELS; i++) { 702 struct ipoctal_channel *channel = &ipoctal->channel[i]; 703 tty_unregister_device(ipoctal->tty_drv, i); 704 tty_port_free_xmit_buf(&channel->tty_port); 705 tty_port_destroy(&channel->tty_port); 706 } 707 708 tty_unregister_driver(ipoctal->tty_drv); 709 put_tty_driver(ipoctal->tty_drv); 710 kfree(ipoctal); 711 } 712 713 static void ipoctal_remove(struct ipack_device *idev) 714 { 715 __ipoctal_remove(dev_get_drvdata(&idev->dev)); 716 } 717 718 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = { 719 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 720 IPACK1_DEVICE_ID_SBS_OCTAL_232) }, 721 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 722 IPACK1_DEVICE_ID_SBS_OCTAL_422) }, 723 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 724 IPACK1_DEVICE_ID_SBS_OCTAL_485) }, 725 { 0, }, 726 }; 727 728 MODULE_DEVICE_TABLE(ipack, ipoctal_ids); 729 730 static const struct ipack_driver_ops ipoctal_drv_ops = { 731 .probe = ipoctal_probe, 732 .remove = ipoctal_remove, 733 }; 734 735 static struct ipack_driver driver = { 736 .ops = &ipoctal_drv_ops, 737 .id_table = ipoctal_ids, 738 }; 739 740 static int __init ipoctal_init(void) 741 { 742 return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME); 743 } 744 745 static void __exit ipoctal_exit(void) 746 { 747 ipack_driver_unregister(&driver); 748 } 749 750 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver"); 751 MODULE_LICENSE("GPL"); 752 753 module_init(ipoctal_init); 754 module_exit(ipoctal_exit); 755