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 "../ipack_ids.h" 27 #include "ipoctal.h" 28 #include "scc2698.h" 29 30 #define IP_OCTAL_ID_SPACE_VECTOR 0x41 31 #define IP_OCTAL_NB_BLOCKS 4 32 33 static const struct tty_operations ipoctal_fops; 34 35 struct ipoctal_channel { 36 struct ipoctal_stats stats; 37 unsigned int nb_bytes; 38 wait_queue_head_t queue; 39 spinlock_t lock; 40 unsigned int pointer_read; 41 unsigned int pointer_write; 42 atomic_t open; 43 struct tty_port tty_port; 44 union scc2698_channel __iomem *regs; 45 union scc2698_block __iomem *block_regs; 46 unsigned int board_id; 47 unsigned char *board_write; 48 u8 isr_rx_rdy_mask; 49 u8 isr_tx_rdy_mask; 50 }; 51 52 struct ipoctal { 53 struct ipack_device *dev; 54 unsigned int board_id; 55 struct ipoctal_channel channel[NR_CHANNELS]; 56 unsigned char write; 57 struct tty_driver *tty_drv; 58 u8 __iomem *mem8_space; 59 u8 __iomem *int_space; 60 }; 61 62 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty) 63 { 64 struct ipoctal_channel *channel; 65 66 channel = dev_get_drvdata(tty->dev); 67 68 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 69 return 0; 70 } 71 72 static int ipoctal_open(struct tty_struct *tty, struct file *file) 73 { 74 int res; 75 struct ipoctal_channel *channel; 76 77 channel = dev_get_drvdata(tty->dev); 78 79 if (atomic_read(&channel->open)) 80 return -EBUSY; 81 82 tty->driver_data = channel; 83 84 res = tty_port_open(&channel->tty_port, tty, file); 85 if (res) 86 return res; 87 88 atomic_inc(&channel->open); 89 return 0; 90 } 91 92 static void ipoctal_reset_stats(struct ipoctal_stats *stats) 93 { 94 stats->tx = 0; 95 stats->rx = 0; 96 stats->rcv_break = 0; 97 stats->framing_err = 0; 98 stats->overrun_err = 0; 99 stats->parity_err = 0; 100 } 101 102 static void ipoctal_free_channel(struct ipoctal_channel *channel) 103 { 104 ipoctal_reset_stats(&channel->stats); 105 channel->pointer_read = 0; 106 channel->pointer_write = 0; 107 channel->nb_bytes = 0; 108 } 109 110 static void ipoctal_close(struct tty_struct *tty, struct file *filp) 111 { 112 struct ipoctal_channel *channel = tty->driver_data; 113 114 tty_port_close(&channel->tty_port, tty, filp); 115 116 if (atomic_dec_and_test(&channel->open)) 117 ipoctal_free_channel(channel); 118 } 119 120 static int ipoctal_get_icount(struct tty_struct *tty, 121 struct serial_icounter_struct *icount) 122 { 123 struct ipoctal_channel *channel = tty->driver_data; 124 125 icount->cts = 0; 126 icount->dsr = 0; 127 icount->rng = 0; 128 icount->dcd = 0; 129 icount->rx = channel->stats.rx; 130 icount->tx = channel->stats.tx; 131 icount->frame = channel->stats.framing_err; 132 icount->parity = channel->stats.parity_err; 133 icount->brk = channel->stats.rcv_break; 134 return 0; 135 } 136 137 static void ipoctal_irq_rx(struct ipoctal_channel *channel, 138 struct tty_struct *tty, u8 sr) 139 { 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(tty, 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(tty, 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 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 } 705 706 tty_unregister_driver(ipoctal->tty_drv); 707 put_tty_driver(ipoctal->tty_drv); 708 kfree(ipoctal); 709 } 710 711 static void ipoctal_remove(struct ipack_device *idev) 712 { 713 __ipoctal_remove(dev_get_drvdata(&idev->dev)); 714 } 715 716 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = { 717 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 718 IPACK1_DEVICE_ID_SBS_OCTAL_232) }, 719 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 720 IPACK1_DEVICE_ID_SBS_OCTAL_422) }, 721 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 722 IPACK1_DEVICE_ID_SBS_OCTAL_485) }, 723 { 0, }, 724 }; 725 726 MODULE_DEVICE_TABLE(ipack, ipoctal_ids); 727 728 static const struct ipack_driver_ops ipoctal_drv_ops = { 729 .probe = ipoctal_probe, 730 .remove = ipoctal_remove, 731 }; 732 733 static struct ipack_driver driver = { 734 .ops = &ipoctal_drv_ops, 735 .id_table = ipoctal_ids, 736 }; 737 738 static int __init ipoctal_init(void) 739 { 740 return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME); 741 } 742 743 static void __exit ipoctal_exit(void) 744 { 745 ipack_driver_unregister(&driver); 746 } 747 748 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver"); 749 MODULE_LICENSE("GPL"); 750 751 module_init(ipoctal_init); 752 module_exit(ipoctal_exit); 753