moxa.c revision e0525393baf07b1bb6e537ddbe7dfae3621649df
1/*****************************************************************************/ 2/* 3 * moxa.c -- MOXA Intellio family multiport serial driver. 4 * 5 * Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com). 6 * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com> 7 * 8 * This code is loosely based on the Linux serial driver, written by 9 * Linus Torvalds, Theodore T'so and others. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 */ 16 17/* 18 * MOXA Intellio Series Driver 19 * for : LINUX 20 * date : 1999/1/7 21 * version : 5.1 22 */ 23 24#include <linux/module.h> 25#include <linux/types.h> 26#include <linux/mm.h> 27#include <linux/ioport.h> 28#include <linux/errno.h> 29#include <linux/firmware.h> 30#include <linux/signal.h> 31#include <linux/sched.h> 32#include <linux/timer.h> 33#include <linux/interrupt.h> 34#include <linux/tty.h> 35#include <linux/tty_flip.h> 36#include <linux/major.h> 37#include <linux/string.h> 38#include <linux/fcntl.h> 39#include <linux/ptrace.h> 40#include <linux/serial.h> 41#include <linux/tty_driver.h> 42#include <linux/delay.h> 43#include <linux/pci.h> 44#include <linux/init.h> 45#include <linux/bitops.h> 46#include <linux/slab.h> 47#include <linux/ratelimit.h> 48 49#include <asm/io.h> 50#include <asm/uaccess.h> 51 52#include "moxa.h" 53 54#define MOXA_VERSION "6.0k" 55 56#define MOXA_FW_HDRLEN 32 57 58#define MOXAMAJOR 172 59 60#define MAX_BOARDS 4 /* Don't change this value */ 61#define MAX_PORTS_PER_BOARD 32 /* Don't change this value */ 62#define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD) 63 64#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \ 65 (brd)->boardType == MOXA_BOARD_C320_PCI) 66 67/* 68 * Define the Moxa PCI vendor and device IDs. 69 */ 70#define MOXA_BUS_TYPE_ISA 0 71#define MOXA_BUS_TYPE_PCI 1 72 73enum { 74 MOXA_BOARD_C218_PCI = 1, 75 MOXA_BOARD_C218_ISA, 76 MOXA_BOARD_C320_PCI, 77 MOXA_BOARD_C320_ISA, 78 MOXA_BOARD_CP204J, 79}; 80 81static char *moxa_brdname[] = 82{ 83 "C218 Turbo PCI series", 84 "C218 Turbo ISA series", 85 "C320 Turbo PCI series", 86 "C320 Turbo ISA series", 87 "CP-204J series", 88}; 89 90#ifdef CONFIG_PCI 91static struct pci_device_id moxa_pcibrds[] = { 92 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218), 93 .driver_data = MOXA_BOARD_C218_PCI }, 94 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320), 95 .driver_data = MOXA_BOARD_C320_PCI }, 96 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J), 97 .driver_data = MOXA_BOARD_CP204J }, 98 { 0 } 99}; 100MODULE_DEVICE_TABLE(pci, moxa_pcibrds); 101#endif /* CONFIG_PCI */ 102 103struct moxa_port; 104 105static struct moxa_board_conf { 106 int boardType; 107 int numPorts; 108 int busType; 109 110 unsigned int ready; 111 112 struct moxa_port *ports; 113 114 void __iomem *basemem; 115 void __iomem *intNdx; 116 void __iomem *intPend; 117 void __iomem *intTable; 118} moxa_boards[MAX_BOARDS]; 119 120struct mxser_mstatus { 121 tcflag_t cflag; 122 int cts; 123 int dsr; 124 int ri; 125 int dcd; 126}; 127 128struct moxaq_str { 129 int inq; 130 int outq; 131}; 132 133struct moxa_port { 134 struct tty_port port; 135 struct moxa_board_conf *board; 136 void __iomem *tableAddr; 137 138 int type; 139 int cflag; 140 unsigned long statusflags; 141 142 u8 DCDState; /* Protected by the port lock */ 143 u8 lineCtrl; 144 u8 lowChkFlag; 145}; 146 147struct mon_str { 148 int tick; 149 int rxcnt[MAX_PORTS]; 150 int txcnt[MAX_PORTS]; 151}; 152 153/* statusflags */ 154#define TXSTOPPED 1 155#define LOWWAIT 2 156#define EMPTYWAIT 3 157 158#define SERIAL_DO_RESTART 159 160#define WAKEUP_CHARS 256 161 162static int ttymajor = MOXAMAJOR; 163static struct mon_str moxaLog; 164static unsigned int moxaFuncTout = HZ / 2; 165static unsigned int moxaLowWaterChk; 166static DEFINE_MUTEX(moxa_openlock); 167static DEFINE_SPINLOCK(moxa_lock); 168 169static unsigned long baseaddr[MAX_BOARDS]; 170static unsigned int type[MAX_BOARDS]; 171static unsigned int numports[MAX_BOARDS]; 172static struct tty_port moxa_service_port; 173 174MODULE_AUTHOR("William Chen"); 175MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver"); 176MODULE_LICENSE("GPL"); 177MODULE_FIRMWARE("c218tunx.cod"); 178MODULE_FIRMWARE("cp204unx.cod"); 179MODULE_FIRMWARE("c320tunx.cod"); 180 181module_param_array(type, uint, NULL, 0); 182MODULE_PARM_DESC(type, "card type: C218=2, C320=4"); 183module_param_array(baseaddr, ulong, NULL, 0); 184MODULE_PARM_DESC(baseaddr, "base address"); 185module_param_array(numports, uint, NULL, 0); 186MODULE_PARM_DESC(numports, "numports (ignored for C218)"); 187 188module_param(ttymajor, int, 0); 189 190/* 191 * static functions: 192 */ 193static int moxa_open(struct tty_struct *, struct file *); 194static void moxa_close(struct tty_struct *, struct file *); 195static int moxa_write(struct tty_struct *, const unsigned char *, int); 196static int moxa_write_room(struct tty_struct *); 197static void moxa_flush_buffer(struct tty_struct *); 198static int moxa_chars_in_buffer(struct tty_struct *); 199static void moxa_set_termios(struct tty_struct *, struct ktermios *); 200static void moxa_stop(struct tty_struct *); 201static void moxa_start(struct tty_struct *); 202static void moxa_hangup(struct tty_struct *); 203static int moxa_tiocmget(struct tty_struct *tty); 204static int moxa_tiocmset(struct tty_struct *tty, 205 unsigned int set, unsigned int clear); 206static void moxa_poll(unsigned long); 207static void moxa_set_tty_param(struct tty_struct *, struct ktermios *); 208static void moxa_shutdown(struct tty_port *); 209static int moxa_carrier_raised(struct tty_port *); 210static void moxa_dtr_rts(struct tty_port *, int); 211/* 212 * moxa board interface functions: 213 */ 214static void MoxaPortEnable(struct moxa_port *); 215static void MoxaPortDisable(struct moxa_port *); 216static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t); 217static int MoxaPortGetLineOut(struct moxa_port *, int *, int *); 218static void MoxaPortLineCtrl(struct moxa_port *, int, int); 219static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int); 220static int MoxaPortLineStatus(struct moxa_port *); 221static void MoxaPortFlushData(struct moxa_port *, int); 222static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int); 223static int MoxaPortReadData(struct moxa_port *); 224static int MoxaPortTxQueue(struct moxa_port *); 225static int MoxaPortRxQueue(struct moxa_port *); 226static int MoxaPortTxFree(struct moxa_port *); 227static void MoxaPortTxDisable(struct moxa_port *); 228static void MoxaPortTxEnable(struct moxa_port *); 229static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *); 230static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *); 231static void MoxaSetFifo(struct moxa_port *port, int enable); 232 233/* 234 * I/O functions 235 */ 236 237static DEFINE_SPINLOCK(moxafunc_lock); 238 239static void moxa_wait_finish(void __iomem *ofsAddr) 240{ 241 unsigned long end = jiffies + moxaFuncTout; 242 243 while (readw(ofsAddr + FuncCode) != 0) 244 if (time_after(jiffies, end)) 245 return; 246 if (readw(ofsAddr + FuncCode) != 0) 247 printk_ratelimited(KERN_WARNING "moxa function expired\n"); 248} 249 250static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg) 251{ 252 unsigned long flags; 253 spin_lock_irqsave(&moxafunc_lock, flags); 254 writew(arg, ofsAddr + FuncArg); 255 writew(cmd, ofsAddr + FuncCode); 256 moxa_wait_finish(ofsAddr); 257 spin_unlock_irqrestore(&moxafunc_lock, flags); 258} 259 260static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg) 261{ 262 unsigned long flags; 263 u16 ret; 264 spin_lock_irqsave(&moxafunc_lock, flags); 265 writew(arg, ofsAddr + FuncArg); 266 writew(cmd, ofsAddr + FuncCode); 267 moxa_wait_finish(ofsAddr); 268 ret = readw(ofsAddr + FuncArg); 269 spin_unlock_irqrestore(&moxafunc_lock, flags); 270 return ret; 271} 272 273static void moxa_low_water_check(void __iomem *ofsAddr) 274{ 275 u16 rptr, wptr, mask, len; 276 277 if (readb(ofsAddr + FlagStat) & Xoff_state) { 278 rptr = readw(ofsAddr + RXrptr); 279 wptr = readw(ofsAddr + RXwptr); 280 mask = readw(ofsAddr + RX_mask); 281 len = (wptr - rptr) & mask; 282 if (len <= Low_water) 283 moxafunc(ofsAddr, FC_SendXon, 0); 284 } 285} 286 287/* 288 * TTY operations 289 */ 290 291static int moxa_ioctl(struct tty_struct *tty, 292 unsigned int cmd, unsigned long arg) 293{ 294 struct moxa_port *ch = tty->driver_data; 295 void __user *argp = (void __user *)arg; 296 int status, ret = 0; 297 298 if (tty->index == MAX_PORTS) { 299 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE && 300 cmd != MOXA_GETMSTATUS) 301 return -EINVAL; 302 } else if (!ch) 303 return -ENODEV; 304 305 switch (cmd) { 306 case MOXA_GETDATACOUNT: 307 moxaLog.tick = jiffies; 308 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog))) 309 ret = -EFAULT; 310 break; 311 case MOXA_FLUSH_QUEUE: 312 MoxaPortFlushData(ch, arg); 313 break; 314 case MOXA_GET_IOQUEUE: { 315 struct moxaq_str __user *argm = argp; 316 struct moxaq_str tmp; 317 struct moxa_port *p; 318 unsigned int i, j; 319 320 for (i = 0; i < MAX_BOARDS; i++) { 321 p = moxa_boards[i].ports; 322 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) { 323 memset(&tmp, 0, sizeof(tmp)); 324 spin_lock_bh(&moxa_lock); 325 if (moxa_boards[i].ready) { 326 tmp.inq = MoxaPortRxQueue(p); 327 tmp.outq = MoxaPortTxQueue(p); 328 } 329 spin_unlock_bh(&moxa_lock); 330 if (copy_to_user(argm, &tmp, sizeof(tmp))) 331 return -EFAULT; 332 } 333 } 334 break; 335 } case MOXA_GET_OQUEUE: 336 status = MoxaPortTxQueue(ch); 337 ret = put_user(status, (unsigned long __user *)argp); 338 break; 339 case MOXA_GET_IQUEUE: 340 status = MoxaPortRxQueue(ch); 341 ret = put_user(status, (unsigned long __user *)argp); 342 break; 343 case MOXA_GETMSTATUS: { 344 struct mxser_mstatus __user *argm = argp; 345 struct mxser_mstatus tmp; 346 struct moxa_port *p; 347 unsigned int i, j; 348 349 for (i = 0; i < MAX_BOARDS; i++) { 350 p = moxa_boards[i].ports; 351 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) { 352 struct tty_struct *ttyp; 353 memset(&tmp, 0, sizeof(tmp)); 354 spin_lock_bh(&moxa_lock); 355 if (!moxa_boards[i].ready) { 356 spin_unlock_bh(&moxa_lock); 357 goto copy; 358 } 359 360 status = MoxaPortLineStatus(p); 361 spin_unlock_bh(&moxa_lock); 362 363 if (status & 1) 364 tmp.cts = 1; 365 if (status & 2) 366 tmp.dsr = 1; 367 if (status & 4) 368 tmp.dcd = 1; 369 370 ttyp = tty_port_tty_get(&p->port); 371 if (!ttyp) 372 tmp.cflag = p->cflag; 373 else 374 tmp.cflag = ttyp->termios.c_cflag; 375 tty_kref_put(ttyp); 376copy: 377 if (copy_to_user(argm, &tmp, sizeof(tmp))) 378 return -EFAULT; 379 } 380 } 381 break; 382 } 383 case TIOCGSERIAL: 384 mutex_lock(&ch->port.mutex); 385 ret = moxa_get_serial_info(ch, argp); 386 mutex_unlock(&ch->port.mutex); 387 break; 388 case TIOCSSERIAL: 389 mutex_lock(&ch->port.mutex); 390 ret = moxa_set_serial_info(ch, argp); 391 mutex_unlock(&ch->port.mutex); 392 break; 393 default: 394 ret = -ENOIOCTLCMD; 395 } 396 return ret; 397} 398 399static int moxa_break_ctl(struct tty_struct *tty, int state) 400{ 401 struct moxa_port *port = tty->driver_data; 402 403 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak, 404 Magic_code); 405 return 0; 406} 407 408static const struct tty_operations moxa_ops = { 409 .open = moxa_open, 410 .close = moxa_close, 411 .write = moxa_write, 412 .write_room = moxa_write_room, 413 .flush_buffer = moxa_flush_buffer, 414 .chars_in_buffer = moxa_chars_in_buffer, 415 .ioctl = moxa_ioctl, 416 .set_termios = moxa_set_termios, 417 .stop = moxa_stop, 418 .start = moxa_start, 419 .hangup = moxa_hangup, 420 .break_ctl = moxa_break_ctl, 421 .tiocmget = moxa_tiocmget, 422 .tiocmset = moxa_tiocmset, 423}; 424 425static const struct tty_port_operations moxa_port_ops = { 426 .carrier_raised = moxa_carrier_raised, 427 .dtr_rts = moxa_dtr_rts, 428 .shutdown = moxa_shutdown, 429}; 430 431static struct tty_driver *moxaDriver; 432static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0); 433 434/* 435 * HW init 436 */ 437 438static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model) 439{ 440 switch (brd->boardType) { 441 case MOXA_BOARD_C218_ISA: 442 case MOXA_BOARD_C218_PCI: 443 if (model != 1) 444 goto err; 445 break; 446 case MOXA_BOARD_CP204J: 447 if (model != 3) 448 goto err; 449 break; 450 default: 451 if (model != 2) 452 goto err; 453 break; 454 } 455 return 0; 456err: 457 return -EINVAL; 458} 459 460static int moxa_check_fw(const void *ptr) 461{ 462 const __le16 *lptr = ptr; 463 464 if (*lptr != cpu_to_le16(0x7980)) 465 return -EINVAL; 466 467 return 0; 468} 469 470static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf, 471 size_t len) 472{ 473 void __iomem *baseAddr = brd->basemem; 474 u16 tmp; 475 476 writeb(HW_reset, baseAddr + Control_reg); /* reset */ 477 msleep(10); 478 memset_io(baseAddr, 0, 4096); 479 memcpy_toio(baseAddr, buf, len); /* download BIOS */ 480 writeb(0, baseAddr + Control_reg); /* restart */ 481 482 msleep(2000); 483 484 switch (brd->boardType) { 485 case MOXA_BOARD_C218_ISA: 486 case MOXA_BOARD_C218_PCI: 487 tmp = readw(baseAddr + C218_key); 488 if (tmp != C218_KeyCode) 489 goto err; 490 break; 491 case MOXA_BOARD_CP204J: 492 tmp = readw(baseAddr + C218_key); 493 if (tmp != CP204J_KeyCode) 494 goto err; 495 break; 496 default: 497 tmp = readw(baseAddr + C320_key); 498 if (tmp != C320_KeyCode) 499 goto err; 500 tmp = readw(baseAddr + C320_status); 501 if (tmp != STS_init) { 502 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic " 503 "module not found\n"); 504 return -EIO; 505 } 506 break; 507 } 508 509 return 0; 510err: 511 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n"); 512 return -EIO; 513} 514 515static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr, 516 size_t len) 517{ 518 void __iomem *baseAddr = brd->basemem; 519 520 if (len < 7168) { 521 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n"); 522 return -EINVAL; 523 } 524 525 writew(len - 7168 - 2, baseAddr + C320bapi_len); 526 writeb(1, baseAddr + Control_reg); /* Select Page 1 */ 527 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168); 528 writeb(2, baseAddr + Control_reg); /* Select Page 2 */ 529 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168); 530 531 return 0; 532} 533 534static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr, 535 size_t len) 536{ 537 void __iomem *baseAddr = brd->basemem; 538 const __le16 *uptr = ptr; 539 size_t wlen, len2, j; 540 unsigned long key, loadbuf, loadlen, checksum, checksum_ok; 541 unsigned int i, retry; 542 u16 usum, keycode; 543 544 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode : 545 C218_KeyCode; 546 547 switch (brd->boardType) { 548 case MOXA_BOARD_CP204J: 549 case MOXA_BOARD_C218_ISA: 550 case MOXA_BOARD_C218_PCI: 551 key = C218_key; 552 loadbuf = C218_LoadBuf; 553 loadlen = C218DLoad_len; 554 checksum = C218check_sum; 555 checksum_ok = C218chksum_ok; 556 break; 557 default: 558 key = C320_key; 559 keycode = C320_KeyCode; 560 loadbuf = C320_LoadBuf; 561 loadlen = C320DLoad_len; 562 checksum = C320check_sum; 563 checksum_ok = C320chksum_ok; 564 break; 565 } 566 567 usum = 0; 568 wlen = len >> 1; 569 for (i = 0; i < wlen; i++) 570 usum += le16_to_cpu(uptr[i]); 571 retry = 0; 572 do { 573 wlen = len >> 1; 574 j = 0; 575 while (wlen) { 576 len2 = (wlen > 2048) ? 2048 : wlen; 577 wlen -= len2; 578 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1); 579 j += len2 << 1; 580 581 writew(len2, baseAddr + loadlen); 582 writew(0, baseAddr + key); 583 for (i = 0; i < 100; i++) { 584 if (readw(baseAddr + key) == keycode) 585 break; 586 msleep(10); 587 } 588 if (readw(baseAddr + key) != keycode) 589 return -EIO; 590 } 591 writew(0, baseAddr + loadlen); 592 writew(usum, baseAddr + checksum); 593 writew(0, baseAddr + key); 594 for (i = 0; i < 100; i++) { 595 if (readw(baseAddr + key) == keycode) 596 break; 597 msleep(10); 598 } 599 retry++; 600 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3)); 601 if (readb(baseAddr + checksum_ok) != 1) 602 return -EIO; 603 604 writew(0, baseAddr + key); 605 for (i = 0; i < 600; i++) { 606 if (readw(baseAddr + Magic_no) == Magic_code) 607 break; 608 msleep(10); 609 } 610 if (readw(baseAddr + Magic_no) != Magic_code) 611 return -EIO; 612 613 if (MOXA_IS_320(brd)) { 614 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */ 615 writew(0x3800, baseAddr + TMS320_PORT1); 616 writew(0x3900, baseAddr + TMS320_PORT2); 617 writew(28499, baseAddr + TMS320_CLOCK); 618 } else { 619 writew(0x3200, baseAddr + TMS320_PORT1); 620 writew(0x3400, baseAddr + TMS320_PORT2); 621 writew(19999, baseAddr + TMS320_CLOCK); 622 } 623 } 624 writew(1, baseAddr + Disable_IRQ); 625 writew(0, baseAddr + Magic_no); 626 for (i = 0; i < 500; i++) { 627 if (readw(baseAddr + Magic_no) == Magic_code) 628 break; 629 msleep(10); 630 } 631 if (readw(baseAddr + Magic_no) != Magic_code) 632 return -EIO; 633 634 if (MOXA_IS_320(brd)) { 635 j = readw(baseAddr + Module_cnt); 636 if (j <= 0) 637 return -EIO; 638 brd->numPorts = j * 8; 639 writew(j, baseAddr + Module_no); 640 writew(0, baseAddr + Magic_no); 641 for (i = 0; i < 600; i++) { 642 if (readw(baseAddr + Magic_no) == Magic_code) 643 break; 644 msleep(10); 645 } 646 if (readw(baseAddr + Magic_no) != Magic_code) 647 return -EIO; 648 } 649 brd->intNdx = baseAddr + IRQindex; 650 brd->intPend = baseAddr + IRQpending; 651 brd->intTable = baseAddr + IRQtable; 652 653 return 0; 654} 655 656static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr, 657 size_t len) 658{ 659 void __iomem *ofsAddr, *baseAddr = brd->basemem; 660 struct moxa_port *port; 661 int retval, i; 662 663 if (len % 2) { 664 printk(KERN_ERR "MOXA: bios length is not even\n"); 665 return -EINVAL; 666 } 667 668 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */ 669 if (retval) 670 return retval; 671 672 switch (brd->boardType) { 673 case MOXA_BOARD_C218_ISA: 674 case MOXA_BOARD_C218_PCI: 675 case MOXA_BOARD_CP204J: 676 port = brd->ports; 677 for (i = 0; i < brd->numPorts; i++, port++) { 678 port->board = brd; 679 port->DCDState = 0; 680 port->tableAddr = baseAddr + Extern_table + 681 Extern_size * i; 682 ofsAddr = port->tableAddr; 683 writew(C218rx_mask, ofsAddr + RX_mask); 684 writew(C218tx_mask, ofsAddr + TX_mask); 685 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb); 686 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb); 687 688 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb); 689 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb); 690 691 } 692 break; 693 default: 694 port = brd->ports; 695 for (i = 0; i < brd->numPorts; i++, port++) { 696 port->board = brd; 697 port->DCDState = 0; 698 port->tableAddr = baseAddr + Extern_table + 699 Extern_size * i; 700 ofsAddr = port->tableAddr; 701 switch (brd->numPorts) { 702 case 8: 703 writew(C320p8rx_mask, ofsAddr + RX_mask); 704 writew(C320p8tx_mask, ofsAddr + TX_mask); 705 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb); 706 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb); 707 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb); 708 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb); 709 710 break; 711 case 16: 712 writew(C320p16rx_mask, ofsAddr + RX_mask); 713 writew(C320p16tx_mask, ofsAddr + TX_mask); 714 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb); 715 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb); 716 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb); 717 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb); 718 break; 719 720 case 24: 721 writew(C320p24rx_mask, ofsAddr + RX_mask); 722 writew(C320p24tx_mask, ofsAddr + TX_mask); 723 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb); 724 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb); 725 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb); 726 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb); 727 break; 728 case 32: 729 writew(C320p32rx_mask, ofsAddr + RX_mask); 730 writew(C320p32tx_mask, ofsAddr + TX_mask); 731 writew(C320p32tx_ofs, ofsAddr + Ofs_txb); 732 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb); 733 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb); 734 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb); 735 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb); 736 break; 737 } 738 } 739 break; 740 } 741 return 0; 742} 743 744static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw) 745{ 746 const void *ptr = fw->data; 747 char rsn[64]; 748 u16 lens[5]; 749 size_t len; 750 unsigned int a, lenp, lencnt; 751 int ret = -EINVAL; 752 struct { 753 __le32 magic; /* 0x34303430 */ 754 u8 reserved1[2]; 755 u8 type; /* UNIX = 3 */ 756 u8 model; /* C218T=1, C320T=2, CP204=3 */ 757 u8 reserved2[8]; 758 __le16 len[5]; 759 } const *hdr = ptr; 760 761 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens)); 762 763 if (fw->size < MOXA_FW_HDRLEN) { 764 strcpy(rsn, "too short (even header won't fit)"); 765 goto err; 766 } 767 if (hdr->magic != cpu_to_le32(0x30343034)) { 768 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic)); 769 goto err; 770 } 771 if (hdr->type != 3) { 772 sprintf(rsn, "not for linux, type is %u", hdr->type); 773 goto err; 774 } 775 if (moxa_check_fw_model(brd, hdr->model)) { 776 sprintf(rsn, "not for this card, model is %u", hdr->model); 777 goto err; 778 } 779 780 len = MOXA_FW_HDRLEN; 781 lencnt = hdr->model == 2 ? 5 : 3; 782 for (a = 0; a < ARRAY_SIZE(lens); a++) { 783 lens[a] = le16_to_cpu(hdr->len[a]); 784 if (lens[a] && len + lens[a] <= fw->size && 785 moxa_check_fw(&fw->data[len])) 786 printk(KERN_WARNING "MOXA firmware: unexpected input " 787 "at offset %u, but going on\n", (u32)len); 788 if (!lens[a] && a < lencnt) { 789 sprintf(rsn, "too few entries in fw file"); 790 goto err; 791 } 792 len += lens[a]; 793 } 794 795 if (len != fw->size) { 796 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size, 797 (u32)len); 798 goto err; 799 } 800 801 ptr += MOXA_FW_HDRLEN; 802 lenp = 0; /* bios */ 803 804 strcpy(rsn, "read above"); 805 806 ret = moxa_load_bios(brd, ptr, lens[lenp]); 807 if (ret) 808 goto err; 809 810 /* we skip the tty section (lens[1]), since we don't need it */ 811 ptr += lens[lenp] + lens[lenp + 1]; 812 lenp += 2; /* comm */ 813 814 if (hdr->model == 2) { 815 ret = moxa_load_320b(brd, ptr, lens[lenp]); 816 if (ret) 817 goto err; 818 /* skip another tty */ 819 ptr += lens[lenp] + lens[lenp + 1]; 820 lenp += 2; 821 } 822 823 ret = moxa_load_code(brd, ptr, lens[lenp]); 824 if (ret) 825 goto err; 826 827 return 0; 828err: 829 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn); 830 return ret; 831} 832 833static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev) 834{ 835 const struct firmware *fw; 836 const char *file; 837 struct moxa_port *p; 838 unsigned int i, first_idx; 839 int ret; 840 841 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports), 842 GFP_KERNEL); 843 if (brd->ports == NULL) { 844 printk(KERN_ERR "cannot allocate memory for ports\n"); 845 ret = -ENOMEM; 846 goto err; 847 } 848 849 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) { 850 tty_port_init(&p->port); 851 p->port.ops = &moxa_port_ops; 852 p->type = PORT_16550A; 853 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL; 854 } 855 856 switch (brd->boardType) { 857 case MOXA_BOARD_C218_ISA: 858 case MOXA_BOARD_C218_PCI: 859 file = "c218tunx.cod"; 860 break; 861 case MOXA_BOARD_CP204J: 862 file = "cp204unx.cod"; 863 break; 864 default: 865 file = "c320tunx.cod"; 866 break; 867 } 868 869 ret = request_firmware(&fw, file, dev); 870 if (ret) { 871 printk(KERN_ERR "MOXA: request_firmware failed. Make sure " 872 "you've placed '%s' file into your firmware " 873 "loader directory (e.g. /lib/firmware)\n", 874 file); 875 goto err_free; 876 } 877 878 ret = moxa_load_fw(brd, fw); 879 880 release_firmware(fw); 881 882 if (ret) 883 goto err_free; 884 885 spin_lock_bh(&moxa_lock); 886 brd->ready = 1; 887 if (!timer_pending(&moxaTimer)) 888 mod_timer(&moxaTimer, jiffies + HZ / 50); 889 spin_unlock_bh(&moxa_lock); 890 891 first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD; 892 for (i = 0; i < brd->numPorts; i++) 893 tty_port_register_device(&brd->ports[i].port, moxaDriver, 894 first_idx + i, dev); 895 896 return 0; 897err_free: 898 for (i = 0; i < MAX_PORTS_PER_BOARD; i++) 899 tty_port_destroy(&brd->ports[i].port); 900 kfree(brd->ports); 901err: 902 return ret; 903} 904 905static void moxa_board_deinit(struct moxa_board_conf *brd) 906{ 907 unsigned int a, opened, first_idx; 908 909 mutex_lock(&moxa_openlock); 910 spin_lock_bh(&moxa_lock); 911 brd->ready = 0; 912 spin_unlock_bh(&moxa_lock); 913 914 /* pci hot-un-plug support */ 915 for (a = 0; a < brd->numPorts; a++) 916 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) 917 tty_port_tty_hangup(&brd->ports[a].port, false); 918 919 for (a = 0; a < MAX_PORTS_PER_BOARD; a++) 920 tty_port_destroy(&brd->ports[a].port); 921 922 while (1) { 923 opened = 0; 924 for (a = 0; a < brd->numPorts; a++) 925 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) 926 opened++; 927 mutex_unlock(&moxa_openlock); 928 if (!opened) 929 break; 930 msleep(50); 931 mutex_lock(&moxa_openlock); 932 } 933 934 first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD; 935 for (a = 0; a < brd->numPorts; a++) 936 tty_unregister_device(moxaDriver, first_idx + a); 937 938 iounmap(brd->basemem); 939 brd->basemem = NULL; 940 kfree(brd->ports); 941} 942 943#ifdef CONFIG_PCI 944static int moxa_pci_probe(struct pci_dev *pdev, 945 const struct pci_device_id *ent) 946{ 947 struct moxa_board_conf *board; 948 unsigned int i; 949 int board_type = ent->driver_data; 950 int retval; 951 952 retval = pci_enable_device(pdev); 953 if (retval) { 954 dev_err(&pdev->dev, "can't enable pci device\n"); 955 goto err; 956 } 957 958 for (i = 0; i < MAX_BOARDS; i++) 959 if (moxa_boards[i].basemem == NULL) 960 break; 961 962 retval = -ENODEV; 963 if (i >= MAX_BOARDS) { 964 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards " 965 "found. Board is ignored.\n", MAX_BOARDS); 966 goto err; 967 } 968 969 board = &moxa_boards[i]; 970 971 retval = pci_request_region(pdev, 2, "moxa-base"); 972 if (retval) { 973 dev_err(&pdev->dev, "can't request pci region 2\n"); 974 goto err; 975 } 976 977 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000); 978 if (board->basemem == NULL) { 979 dev_err(&pdev->dev, "can't remap io space 2\n"); 980 retval = -ENOMEM; 981 goto err_reg; 982 } 983 984 board->boardType = board_type; 985 switch (board_type) { 986 case MOXA_BOARD_C218_ISA: 987 case MOXA_BOARD_C218_PCI: 988 board->numPorts = 8; 989 break; 990 991 case MOXA_BOARD_CP204J: 992 board->numPorts = 4; 993 break; 994 default: 995 board->numPorts = 0; 996 break; 997 } 998 board->busType = MOXA_BUS_TYPE_PCI; 999 1000 retval = moxa_init_board(board, &pdev->dev); 1001 if (retval) 1002 goto err_base; 1003 1004 pci_set_drvdata(pdev, board); 1005 1006 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n", 1007 moxa_brdname[board_type - 1], board->numPorts); 1008 1009 return 0; 1010err_base: 1011 iounmap(board->basemem); 1012 board->basemem = NULL; 1013err_reg: 1014 pci_release_region(pdev, 2); 1015err: 1016 return retval; 1017} 1018 1019static void moxa_pci_remove(struct pci_dev *pdev) 1020{ 1021 struct moxa_board_conf *brd = pci_get_drvdata(pdev); 1022 1023 moxa_board_deinit(brd); 1024 1025 pci_release_region(pdev, 2); 1026} 1027 1028static struct pci_driver moxa_pci_driver = { 1029 .name = "moxa", 1030 .id_table = moxa_pcibrds, 1031 .probe = moxa_pci_probe, 1032 .remove = moxa_pci_remove 1033}; 1034#endif /* CONFIG_PCI */ 1035 1036static int __init moxa_init(void) 1037{ 1038 unsigned int isabrds = 0; 1039 int retval = 0; 1040 struct moxa_board_conf *brd = moxa_boards; 1041 unsigned int i; 1042 1043 printk(KERN_INFO "MOXA Intellio family driver version %s\n", 1044 MOXA_VERSION); 1045 1046 tty_port_init(&moxa_service_port); 1047 1048 moxaDriver = tty_alloc_driver(MAX_PORTS + 1, 1049 TTY_DRIVER_REAL_RAW | 1050 TTY_DRIVER_DYNAMIC_DEV); 1051 if (IS_ERR(moxaDriver)) 1052 return PTR_ERR(moxaDriver); 1053 1054 moxaDriver->name = "ttyMX"; 1055 moxaDriver->major = ttymajor; 1056 moxaDriver->minor_start = 0; 1057 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL; 1058 moxaDriver->subtype = SERIAL_TYPE_NORMAL; 1059 moxaDriver->init_termios = tty_std_termios; 1060 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL; 1061 moxaDriver->init_termios.c_ispeed = 9600; 1062 moxaDriver->init_termios.c_ospeed = 9600; 1063 tty_set_operations(moxaDriver, &moxa_ops); 1064 /* Having one more port only for ioctls is ugly */ 1065 tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS); 1066 1067 if (tty_register_driver(moxaDriver)) { 1068 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n"); 1069 put_tty_driver(moxaDriver); 1070 return -1; 1071 } 1072 1073 /* Find the boards defined from module args. */ 1074 1075 for (i = 0; i < MAX_BOARDS; i++) { 1076 if (!baseaddr[i]) 1077 break; 1078 if (type[i] == MOXA_BOARD_C218_ISA || 1079 type[i] == MOXA_BOARD_C320_ISA) { 1080 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n", 1081 isabrds + 1, moxa_brdname[type[i] - 1], 1082 baseaddr[i]); 1083 brd->boardType = type[i]; 1084 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 : 1085 numports[i]; 1086 brd->busType = MOXA_BUS_TYPE_ISA; 1087 brd->basemem = ioremap_nocache(baseaddr[i], 0x4000); 1088 if (!brd->basemem) { 1089 printk(KERN_ERR "MOXA: can't remap %lx\n", 1090 baseaddr[i]); 1091 continue; 1092 } 1093 if (moxa_init_board(brd, NULL)) { 1094 iounmap(brd->basemem); 1095 brd->basemem = NULL; 1096 continue; 1097 } 1098 1099 printk(KERN_INFO "MOXA isa board found at 0x%.8lx and " 1100 "ready (%u ports, firmware loaded)\n", 1101 baseaddr[i], brd->numPorts); 1102 1103 brd++; 1104 isabrds++; 1105 } 1106 } 1107 1108#ifdef CONFIG_PCI 1109 retval = pci_register_driver(&moxa_pci_driver); 1110 if (retval) { 1111 printk(KERN_ERR "Can't register MOXA pci driver!\n"); 1112 if (isabrds) 1113 retval = 0; 1114 } 1115#endif 1116 1117 return retval; 1118} 1119 1120static void __exit moxa_exit(void) 1121{ 1122 unsigned int i; 1123 1124#ifdef CONFIG_PCI 1125 pci_unregister_driver(&moxa_pci_driver); 1126#endif 1127 1128 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */ 1129 if (moxa_boards[i].ready) 1130 moxa_board_deinit(&moxa_boards[i]); 1131 1132 del_timer_sync(&moxaTimer); 1133 1134 if (tty_unregister_driver(moxaDriver)) 1135 printk(KERN_ERR "Couldn't unregister MOXA Intellio family " 1136 "serial driver\n"); 1137 put_tty_driver(moxaDriver); 1138} 1139 1140module_init(moxa_init); 1141module_exit(moxa_exit); 1142 1143static void moxa_shutdown(struct tty_port *port) 1144{ 1145 struct moxa_port *ch = container_of(port, struct moxa_port, port); 1146 MoxaPortDisable(ch); 1147 MoxaPortFlushData(ch, 2); 1148} 1149 1150static int moxa_carrier_raised(struct tty_port *port) 1151{ 1152 struct moxa_port *ch = container_of(port, struct moxa_port, port); 1153 int dcd; 1154 1155 spin_lock_irq(&port->lock); 1156 dcd = ch->DCDState; 1157 spin_unlock_irq(&port->lock); 1158 return dcd; 1159} 1160 1161static void moxa_dtr_rts(struct tty_port *port, int onoff) 1162{ 1163 struct moxa_port *ch = container_of(port, struct moxa_port, port); 1164 MoxaPortLineCtrl(ch, onoff, onoff); 1165} 1166 1167 1168static int moxa_open(struct tty_struct *tty, struct file *filp) 1169{ 1170 struct moxa_board_conf *brd; 1171 struct moxa_port *ch; 1172 int port; 1173 1174 port = tty->index; 1175 if (port == MAX_PORTS) { 1176 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM; 1177 } 1178 if (mutex_lock_interruptible(&moxa_openlock)) 1179 return -ERESTARTSYS; 1180 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD]; 1181 if (!brd->ready) { 1182 mutex_unlock(&moxa_openlock); 1183 return -ENODEV; 1184 } 1185 1186 if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) { 1187 mutex_unlock(&moxa_openlock); 1188 return -ENODEV; 1189 } 1190 1191 ch = &brd->ports[port % MAX_PORTS_PER_BOARD]; 1192 ch->port.count++; 1193 tty->driver_data = ch; 1194 tty_port_tty_set(&ch->port, tty); 1195 mutex_lock(&ch->port.mutex); 1196 if (!(ch->port.flags & ASYNC_INITIALIZED)) { 1197 ch->statusflags = 0; 1198 moxa_set_tty_param(tty, &tty->termios); 1199 MoxaPortLineCtrl(ch, 1, 1); 1200 MoxaPortEnable(ch); 1201 MoxaSetFifo(ch, ch->type == PORT_16550A); 1202 ch->port.flags |= ASYNC_INITIALIZED; 1203 } 1204 mutex_unlock(&ch->port.mutex); 1205 mutex_unlock(&moxa_openlock); 1206 1207 return tty_port_block_til_ready(&ch->port, tty, filp); 1208} 1209 1210static void moxa_close(struct tty_struct *tty, struct file *filp) 1211{ 1212 struct moxa_port *ch = tty->driver_data; 1213 ch->cflag = tty->termios.c_cflag; 1214 tty_port_close(&ch->port, tty, filp); 1215} 1216 1217static int moxa_write(struct tty_struct *tty, 1218 const unsigned char *buf, int count) 1219{ 1220 struct moxa_port *ch = tty->driver_data; 1221 unsigned long flags; 1222 int len; 1223 1224 if (ch == NULL) 1225 return 0; 1226 1227 spin_lock_irqsave(&moxa_lock, flags); 1228 len = MoxaPortWriteData(tty, buf, count); 1229 spin_unlock_irqrestore(&moxa_lock, flags); 1230 1231 set_bit(LOWWAIT, &ch->statusflags); 1232 return len; 1233} 1234 1235static int moxa_write_room(struct tty_struct *tty) 1236{ 1237 struct moxa_port *ch; 1238 1239 if (tty->stopped) 1240 return 0; 1241 ch = tty->driver_data; 1242 if (ch == NULL) 1243 return 0; 1244 return MoxaPortTxFree(ch); 1245} 1246 1247static void moxa_flush_buffer(struct tty_struct *tty) 1248{ 1249 struct moxa_port *ch = tty->driver_data; 1250 1251 if (ch == NULL) 1252 return; 1253 MoxaPortFlushData(ch, 1); 1254 tty_wakeup(tty); 1255} 1256 1257static int moxa_chars_in_buffer(struct tty_struct *tty) 1258{ 1259 struct moxa_port *ch = tty->driver_data; 1260 int chars; 1261 1262 chars = MoxaPortTxQueue(ch); 1263 if (chars) 1264 /* 1265 * Make it possible to wakeup anything waiting for output 1266 * in tty_ioctl.c, etc. 1267 */ 1268 set_bit(EMPTYWAIT, &ch->statusflags); 1269 return chars; 1270} 1271 1272static int moxa_tiocmget(struct tty_struct *tty) 1273{ 1274 struct moxa_port *ch = tty->driver_data; 1275 int flag = 0, dtr, rts; 1276 1277 MoxaPortGetLineOut(ch, &dtr, &rts); 1278 if (dtr) 1279 flag |= TIOCM_DTR; 1280 if (rts) 1281 flag |= TIOCM_RTS; 1282 dtr = MoxaPortLineStatus(ch); 1283 if (dtr & 1) 1284 flag |= TIOCM_CTS; 1285 if (dtr & 2) 1286 flag |= TIOCM_DSR; 1287 if (dtr & 4) 1288 flag |= TIOCM_CD; 1289 return flag; 1290} 1291 1292static int moxa_tiocmset(struct tty_struct *tty, 1293 unsigned int set, unsigned int clear) 1294{ 1295 struct moxa_port *ch; 1296 int dtr, rts; 1297 1298 mutex_lock(&moxa_openlock); 1299 ch = tty->driver_data; 1300 if (!ch) { 1301 mutex_unlock(&moxa_openlock); 1302 return -EINVAL; 1303 } 1304 1305 MoxaPortGetLineOut(ch, &dtr, &rts); 1306 if (set & TIOCM_RTS) 1307 rts = 1; 1308 if (set & TIOCM_DTR) 1309 dtr = 1; 1310 if (clear & TIOCM_RTS) 1311 rts = 0; 1312 if (clear & TIOCM_DTR) 1313 dtr = 0; 1314 MoxaPortLineCtrl(ch, dtr, rts); 1315 mutex_unlock(&moxa_openlock); 1316 return 0; 1317} 1318 1319static void moxa_set_termios(struct tty_struct *tty, 1320 struct ktermios *old_termios) 1321{ 1322 struct moxa_port *ch = tty->driver_data; 1323 1324 if (ch == NULL) 1325 return; 1326 moxa_set_tty_param(tty, old_termios); 1327 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1328 wake_up_interruptible(&ch->port.open_wait); 1329} 1330 1331static void moxa_stop(struct tty_struct *tty) 1332{ 1333 struct moxa_port *ch = tty->driver_data; 1334 1335 if (ch == NULL) 1336 return; 1337 MoxaPortTxDisable(ch); 1338 set_bit(TXSTOPPED, &ch->statusflags); 1339} 1340 1341 1342static void moxa_start(struct tty_struct *tty) 1343{ 1344 struct moxa_port *ch = tty->driver_data; 1345 1346 if (ch == NULL) 1347 return; 1348 1349 if (!test_bit(TXSTOPPED, &ch->statusflags)) 1350 return; 1351 1352 MoxaPortTxEnable(ch); 1353 clear_bit(TXSTOPPED, &ch->statusflags); 1354} 1355 1356static void moxa_hangup(struct tty_struct *tty) 1357{ 1358 struct moxa_port *ch = tty->driver_data; 1359 tty_port_hangup(&ch->port); 1360} 1361 1362static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd) 1363{ 1364 unsigned long flags; 1365 dcd = !!dcd; 1366 1367 spin_lock_irqsave(&p->port.lock, flags); 1368 if (dcd != p->DCDState) { 1369 p->DCDState = dcd; 1370 spin_unlock_irqrestore(&p->port.lock, flags); 1371 if (!dcd) 1372 tty_port_tty_hangup(&p->port, true); 1373 } 1374 else 1375 spin_unlock_irqrestore(&p->port.lock, flags); 1376} 1377 1378static int moxa_poll_port(struct moxa_port *p, unsigned int handle, 1379 u16 __iomem *ip) 1380{ 1381 struct tty_struct *tty = tty_port_tty_get(&p->port); 1382 void __iomem *ofsAddr; 1383 unsigned int inited = p->port.flags & ASYNC_INITIALIZED; 1384 u16 intr; 1385 1386 if (tty) { 1387 if (test_bit(EMPTYWAIT, &p->statusflags) && 1388 MoxaPortTxQueue(p) == 0) { 1389 clear_bit(EMPTYWAIT, &p->statusflags); 1390 tty_wakeup(tty); 1391 } 1392 if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped && 1393 MoxaPortTxQueue(p) <= WAKEUP_CHARS) { 1394 clear_bit(LOWWAIT, &p->statusflags); 1395 tty_wakeup(tty); 1396 } 1397 1398 if (inited && !test_bit(TTY_THROTTLED, &tty->flags) && 1399 MoxaPortRxQueue(p) > 0) { /* RX */ 1400 MoxaPortReadData(p); 1401 tty_schedule_flip(&p->port); 1402 } 1403 } else { 1404 clear_bit(EMPTYWAIT, &p->statusflags); 1405 MoxaPortFlushData(p, 0); /* flush RX */ 1406 } 1407 1408 if (!handle) /* nothing else to do */ 1409 goto put; 1410 1411 intr = readw(ip); /* port irq status */ 1412 if (intr == 0) 1413 goto put; 1414 1415 writew(0, ip); /* ACK port */ 1416 ofsAddr = p->tableAddr; 1417 if (intr & IntrTx) /* disable tx intr */ 1418 writew(readw(ofsAddr + HostStat) & ~WakeupTx, 1419 ofsAddr + HostStat); 1420 1421 if (!inited) 1422 goto put; 1423 1424 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */ 1425 tty_insert_flip_char(&p->port, 0, TTY_BREAK); 1426 tty_schedule_flip(&p->port); 1427 } 1428 1429 if (intr & IntrLine) 1430 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state); 1431put: 1432 tty_kref_put(tty); 1433 1434 return 0; 1435} 1436 1437static void moxa_poll(unsigned long ignored) 1438{ 1439 struct moxa_board_conf *brd; 1440 u16 __iomem *ip; 1441 unsigned int card, port, served = 0; 1442 1443 spin_lock(&moxa_lock); 1444 for (card = 0; card < MAX_BOARDS; card++) { 1445 brd = &moxa_boards[card]; 1446 if (!brd->ready) 1447 continue; 1448 1449 served++; 1450 1451 ip = NULL; 1452 if (readb(brd->intPend) == 0xff) 1453 ip = brd->intTable + readb(brd->intNdx); 1454 1455 for (port = 0; port < brd->numPorts; port++) 1456 moxa_poll_port(&brd->ports[port], !!ip, ip + port); 1457 1458 if (ip) 1459 writeb(0, brd->intPend); /* ACK */ 1460 1461 if (moxaLowWaterChk) { 1462 struct moxa_port *p = brd->ports; 1463 for (port = 0; port < brd->numPorts; port++, p++) 1464 if (p->lowChkFlag) { 1465 p->lowChkFlag = 0; 1466 moxa_low_water_check(p->tableAddr); 1467 } 1468 } 1469 } 1470 moxaLowWaterChk = 0; 1471 1472 if (served) 1473 mod_timer(&moxaTimer, jiffies + HZ / 50); 1474 spin_unlock(&moxa_lock); 1475} 1476 1477/******************************************************************************/ 1478 1479static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios) 1480{ 1481 register struct ktermios *ts = &tty->termios; 1482 struct moxa_port *ch = tty->driver_data; 1483 int rts, cts, txflow, rxflow, xany, baud; 1484 1485 rts = cts = txflow = rxflow = xany = 0; 1486 if (ts->c_cflag & CRTSCTS) 1487 rts = cts = 1; 1488 if (ts->c_iflag & IXON) 1489 txflow = 1; 1490 if (ts->c_iflag & IXOFF) 1491 rxflow = 1; 1492 if (ts->c_iflag & IXANY) 1493 xany = 1; 1494 1495 /* Clear the features we don't support */ 1496 ts->c_cflag &= ~CMSPAR; 1497 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany); 1498 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty)); 1499 if (baud == -1) 1500 baud = tty_termios_baud_rate(old_termios); 1501 /* Not put the baud rate into the termios data */ 1502 tty_encode_baud_rate(tty, baud, baud); 1503} 1504 1505/***************************************************************************** 1506 * Driver level functions: * 1507 *****************************************************************************/ 1508 1509static void MoxaPortFlushData(struct moxa_port *port, int mode) 1510{ 1511 void __iomem *ofsAddr; 1512 if (mode < 0 || mode > 2) 1513 return; 1514 ofsAddr = port->tableAddr; 1515 moxafunc(ofsAddr, FC_FlushQueue, mode); 1516 if (mode != 1) { 1517 port->lowChkFlag = 0; 1518 moxa_low_water_check(ofsAddr); 1519 } 1520} 1521 1522/* 1523 * Moxa Port Number Description: 1524 * 1525 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And, 1526 * the port number using in MOXA driver functions will be 0 to 31 for 1527 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96 1528 * to 127 for fourth. For example, if you setup three MOXA boards, 1529 * first board is C218, second board is C320-16 and third board is 1530 * C320-32. The port number of first board (C218 - 8 ports) is from 1531 * 0 to 7. The port number of second board (C320 - 16 ports) is form 1532 * 32 to 47. The port number of third board (C320 - 32 ports) is from 1533 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to 1534 * 127 will be invalid. 1535 * 1536 * 1537 * Moxa Functions Description: 1538 * 1539 * Function 1: Driver initialization routine, this routine must be 1540 * called when initialized driver. 1541 * Syntax: 1542 * void MoxaDriverInit(); 1543 * 1544 * 1545 * Function 2: Moxa driver private IOCTL command processing. 1546 * Syntax: 1547 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port); 1548 * 1549 * unsigned int cmd : IOCTL command 1550 * unsigned long arg : IOCTL argument 1551 * int port : port number (0 - 127) 1552 * 1553 * return: 0 (OK) 1554 * -EINVAL 1555 * -ENOIOCTLCMD 1556 * 1557 * 1558 * Function 6: Enable this port to start Tx/Rx data. 1559 * Syntax: 1560 * void MoxaPortEnable(int port); 1561 * int port : port number (0 - 127) 1562 * 1563 * 1564 * Function 7: Disable this port 1565 * Syntax: 1566 * void MoxaPortDisable(int port); 1567 * int port : port number (0 - 127) 1568 * 1569 * 1570 * Function 10: Setting baud rate of this port. 1571 * Syntax: 1572 * speed_t MoxaPortSetBaud(int port, speed_t baud); 1573 * int port : port number (0 - 127) 1574 * long baud : baud rate (50 - 115200) 1575 * 1576 * return: 0 : this port is invalid or baud < 50 1577 * 50 - 115200 : the real baud rate set to the port, if 1578 * the argument baud is large than maximun 1579 * available baud rate, the real setting 1580 * baud rate will be the maximun baud rate. 1581 * 1582 * 1583 * Function 12: Configure the port. 1584 * Syntax: 1585 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud); 1586 * int port : port number (0 - 127) 1587 * struct ktermios * termio : termio structure pointer 1588 * speed_t baud : baud rate 1589 * 1590 * return: -1 : this port is invalid or termio == NULL 1591 * 0 : setting O.K. 1592 * 1593 * 1594 * Function 13: Get the DTR/RTS state of this port. 1595 * Syntax: 1596 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState); 1597 * int port : port number (0 - 127) 1598 * int * dtrState : pointer to INT to receive the current DTR 1599 * state. (if NULL, this function will not 1600 * write to this address) 1601 * int * rtsState : pointer to INT to receive the current RTS 1602 * state. (if NULL, this function will not 1603 * write to this address) 1604 * 1605 * return: -1 : this port is invalid 1606 * 0 : O.K. 1607 * 1608 * 1609 * Function 14: Setting the DTR/RTS output state of this port. 1610 * Syntax: 1611 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState); 1612 * int port : port number (0 - 127) 1613 * int dtrState : DTR output state (0: off, 1: on) 1614 * int rtsState : RTS output state (0: off, 1: on) 1615 * 1616 * 1617 * Function 15: Setting the flow control of this port. 1618 * Syntax: 1619 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow, 1620 * int txFlow,int xany); 1621 * int port : port number (0 - 127) 1622 * int rtsFlow : H/W RTS flow control (0: no, 1: yes) 1623 * int ctsFlow : H/W CTS flow control (0: no, 1: yes) 1624 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes) 1625 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes) 1626 * int xany : S/W XANY flow control (0: no, 1: yes) 1627 * 1628 * 1629 * Function 16: Get ths line status of this port 1630 * Syntax: 1631 * int MoxaPortLineStatus(int port); 1632 * int port : port number (0 - 127) 1633 * 1634 * return: Bit 0 - CTS state (0: off, 1: on) 1635 * Bit 1 - DSR state (0: off, 1: on) 1636 * Bit 2 - DCD state (0: off, 1: on) 1637 * 1638 * 1639 * Function 19: Flush the Rx/Tx buffer data of this port. 1640 * Syntax: 1641 * void MoxaPortFlushData(int port, int mode); 1642 * int port : port number (0 - 127) 1643 * int mode 1644 * 0 : flush the Rx buffer 1645 * 1 : flush the Tx buffer 1646 * 2 : flush the Rx and Tx buffer 1647 * 1648 * 1649 * Function 20: Write data. 1650 * Syntax: 1651 * int MoxaPortWriteData(int port, unsigned char * buffer, int length); 1652 * int port : port number (0 - 127) 1653 * unsigned char * buffer : pointer to write data buffer. 1654 * int length : write data length 1655 * 1656 * return: 0 - length : real write data length 1657 * 1658 * 1659 * Function 21: Read data. 1660 * Syntax: 1661 * int MoxaPortReadData(int port, struct tty_struct *tty); 1662 * int port : port number (0 - 127) 1663 * struct tty_struct *tty : tty for data 1664 * 1665 * return: 0 - length : real read data length 1666 * 1667 * 1668 * Function 24: Get the Tx buffer current queued data bytes 1669 * Syntax: 1670 * int MoxaPortTxQueue(int port); 1671 * int port : port number (0 - 127) 1672 * 1673 * return: .. : Tx buffer current queued data bytes 1674 * 1675 * 1676 * Function 25: Get the Tx buffer current free space 1677 * Syntax: 1678 * int MoxaPortTxFree(int port); 1679 * int port : port number (0 - 127) 1680 * 1681 * return: .. : Tx buffer current free space 1682 * 1683 * 1684 * Function 26: Get the Rx buffer current queued data bytes 1685 * Syntax: 1686 * int MoxaPortRxQueue(int port); 1687 * int port : port number (0 - 127) 1688 * 1689 * return: .. : Rx buffer current queued data bytes 1690 * 1691 * 1692 * Function 28: Disable port data transmission. 1693 * Syntax: 1694 * void MoxaPortTxDisable(int port); 1695 * int port : port number (0 - 127) 1696 * 1697 * 1698 * Function 29: Enable port data transmission. 1699 * Syntax: 1700 * void MoxaPortTxEnable(int port); 1701 * int port : port number (0 - 127) 1702 * 1703 * 1704 * Function 31: Get the received BREAK signal count and reset it. 1705 * Syntax: 1706 * int MoxaPortResetBrkCnt(int port); 1707 * int port : port number (0 - 127) 1708 * 1709 * return: 0 - .. : BREAK signal count 1710 * 1711 * 1712 */ 1713 1714static void MoxaPortEnable(struct moxa_port *port) 1715{ 1716 void __iomem *ofsAddr; 1717 u16 lowwater = 512; 1718 1719 ofsAddr = port->tableAddr; 1720 writew(lowwater, ofsAddr + Low_water); 1721 if (MOXA_IS_320(port->board)) 1722 moxafunc(ofsAddr, FC_SetBreakIrq, 0); 1723 else 1724 writew(readw(ofsAddr + HostStat) | WakeupBreak, 1725 ofsAddr + HostStat); 1726 1727 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code); 1728 moxafunc(ofsAddr, FC_FlushQueue, 2); 1729 1730 moxafunc(ofsAddr, FC_EnableCH, Magic_code); 1731 MoxaPortLineStatus(port); 1732} 1733 1734static void MoxaPortDisable(struct moxa_port *port) 1735{ 1736 void __iomem *ofsAddr = port->tableAddr; 1737 1738 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */ 1739 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code); 1740 writew(0, ofsAddr + HostStat); 1741 moxafunc(ofsAddr, FC_DisableCH, Magic_code); 1742} 1743 1744static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud) 1745{ 1746 void __iomem *ofsAddr = port->tableAddr; 1747 unsigned int clock, val; 1748 speed_t max; 1749 1750 max = MOXA_IS_320(port->board) ? 460800 : 921600; 1751 if (baud < 50) 1752 return 0; 1753 if (baud > max) 1754 baud = max; 1755 clock = 921600; 1756 val = clock / baud; 1757 moxafunc(ofsAddr, FC_SetBaud, val); 1758 baud = clock / val; 1759 return baud; 1760} 1761 1762static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio, 1763 speed_t baud) 1764{ 1765 void __iomem *ofsAddr; 1766 tcflag_t mode = 0; 1767 1768 ofsAddr = port->tableAddr; 1769 1770 mode = termio->c_cflag & CSIZE; 1771 if (mode == CS5) 1772 mode = MX_CS5; 1773 else if (mode == CS6) 1774 mode = MX_CS6; 1775 else if (mode == CS7) 1776 mode = MX_CS7; 1777 else if (mode == CS8) 1778 mode = MX_CS8; 1779 1780 if (termio->c_cflag & CSTOPB) { 1781 if (mode == MX_CS5) 1782 mode |= MX_STOP15; 1783 else 1784 mode |= MX_STOP2; 1785 } else 1786 mode |= MX_STOP1; 1787 1788 if (termio->c_cflag & PARENB) { 1789 if (termio->c_cflag & PARODD) 1790 mode |= MX_PARODD; 1791 else 1792 mode |= MX_PAREVEN; 1793 } else 1794 mode |= MX_PARNONE; 1795 1796 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode); 1797 1798 if (MOXA_IS_320(port->board) && baud >= 921600) 1799 return -1; 1800 1801 baud = MoxaPortSetBaud(port, baud); 1802 1803 if (termio->c_iflag & (IXON | IXOFF | IXANY)) { 1804 spin_lock_irq(&moxafunc_lock); 1805 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg); 1806 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1); 1807 writeb(FC_SetXonXoff, ofsAddr + FuncCode); 1808 moxa_wait_finish(ofsAddr); 1809 spin_unlock_irq(&moxafunc_lock); 1810 1811 } 1812 return baud; 1813} 1814 1815static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState, 1816 int *rtsState) 1817{ 1818 if (dtrState) 1819 *dtrState = !!(port->lineCtrl & DTR_ON); 1820 if (rtsState) 1821 *rtsState = !!(port->lineCtrl & RTS_ON); 1822 1823 return 0; 1824} 1825 1826static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts) 1827{ 1828 u8 mode = 0; 1829 1830 if (dtr) 1831 mode |= DTR_ON; 1832 if (rts) 1833 mode |= RTS_ON; 1834 port->lineCtrl = mode; 1835 moxafunc(port->tableAddr, FC_LineControl, mode); 1836} 1837 1838static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts, 1839 int txflow, int rxflow, int txany) 1840{ 1841 int mode = 0; 1842 1843 if (rts) 1844 mode |= RTS_FlowCtl; 1845 if (cts) 1846 mode |= CTS_FlowCtl; 1847 if (txflow) 1848 mode |= Tx_FlowCtl; 1849 if (rxflow) 1850 mode |= Rx_FlowCtl; 1851 if (txany) 1852 mode |= IXM_IXANY; 1853 moxafunc(port->tableAddr, FC_SetFlowCtl, mode); 1854} 1855 1856static int MoxaPortLineStatus(struct moxa_port *port) 1857{ 1858 void __iomem *ofsAddr; 1859 int val; 1860 1861 ofsAddr = port->tableAddr; 1862 if (MOXA_IS_320(port->board)) 1863 val = moxafuncret(ofsAddr, FC_LineStatus, 0); 1864 else 1865 val = readw(ofsAddr + FlagStat) >> 4; 1866 val &= 0x0B; 1867 if (val & 8) 1868 val |= 4; 1869 moxa_new_dcdstate(port, val & 8); 1870 val &= 7; 1871 return val; 1872} 1873 1874static int MoxaPortWriteData(struct tty_struct *tty, 1875 const unsigned char *buffer, int len) 1876{ 1877 struct moxa_port *port = tty->driver_data; 1878 void __iomem *baseAddr, *ofsAddr, *ofs; 1879 unsigned int c, total; 1880 u16 head, tail, tx_mask, spage, epage; 1881 u16 pageno, pageofs, bufhead; 1882 1883 ofsAddr = port->tableAddr; 1884 baseAddr = port->board->basemem; 1885 tx_mask = readw(ofsAddr + TX_mask); 1886 spage = readw(ofsAddr + Page_txb); 1887 epage = readw(ofsAddr + EndPage_txb); 1888 tail = readw(ofsAddr + TXwptr); 1889 head = readw(ofsAddr + TXrptr); 1890 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask); 1891 if (c > len) 1892 c = len; 1893 moxaLog.txcnt[port->port.tty->index] += c; 1894 total = c; 1895 if (spage == epage) { 1896 bufhead = readw(ofsAddr + Ofs_txb); 1897 writew(spage, baseAddr + Control_reg); 1898 while (c > 0) { 1899 if (head > tail) 1900 len = head - tail - 1; 1901 else 1902 len = tx_mask + 1 - tail; 1903 len = (c > len) ? len : c; 1904 ofs = baseAddr + DynPage_addr + bufhead + tail; 1905 memcpy_toio(ofs, buffer, len); 1906 buffer += len; 1907 tail = (tail + len) & tx_mask; 1908 c -= len; 1909 } 1910 } else { 1911 pageno = spage + (tail >> 13); 1912 pageofs = tail & Page_mask; 1913 while (c > 0) { 1914 len = Page_size - pageofs; 1915 if (len > c) 1916 len = c; 1917 writeb(pageno, baseAddr + Control_reg); 1918 ofs = baseAddr + DynPage_addr + pageofs; 1919 memcpy_toio(ofs, buffer, len); 1920 buffer += len; 1921 if (++pageno == epage) 1922 pageno = spage; 1923 pageofs = 0; 1924 c -= len; 1925 } 1926 tail = (tail + total) & tx_mask; 1927 } 1928 writew(tail, ofsAddr + TXwptr); 1929 writeb(1, ofsAddr + CD180TXirq); /* start to send */ 1930 return total; 1931} 1932 1933static int MoxaPortReadData(struct moxa_port *port) 1934{ 1935 struct tty_struct *tty = port->port.tty; 1936 unsigned char *dst; 1937 void __iomem *baseAddr, *ofsAddr, *ofs; 1938 unsigned int count, len, total; 1939 u16 tail, rx_mask, spage, epage; 1940 u16 pageno, pageofs, bufhead, head; 1941 1942 ofsAddr = port->tableAddr; 1943 baseAddr = port->board->basemem; 1944 head = readw(ofsAddr + RXrptr); 1945 tail = readw(ofsAddr + RXwptr); 1946 rx_mask = readw(ofsAddr + RX_mask); 1947 spage = readw(ofsAddr + Page_rxb); 1948 epage = readw(ofsAddr + EndPage_rxb); 1949 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1); 1950 if (count == 0) 1951 return 0; 1952 1953 total = count; 1954 moxaLog.rxcnt[tty->index] += total; 1955 if (spage == epage) { 1956 bufhead = readw(ofsAddr + Ofs_rxb); 1957 writew(spage, baseAddr + Control_reg); 1958 while (count > 0) { 1959 ofs = baseAddr + DynPage_addr + bufhead + head; 1960 len = (tail >= head) ? (tail - head) : 1961 (rx_mask + 1 - head); 1962 len = tty_prepare_flip_string(&port->port, &dst, 1963 min(len, count)); 1964 memcpy_fromio(dst, ofs, len); 1965 head = (head + len) & rx_mask; 1966 count -= len; 1967 } 1968 } else { 1969 pageno = spage + (head >> 13); 1970 pageofs = head & Page_mask; 1971 while (count > 0) { 1972 writew(pageno, baseAddr + Control_reg); 1973 ofs = baseAddr + DynPage_addr + pageofs; 1974 len = tty_prepare_flip_string(&port->port, &dst, 1975 min(Page_size - pageofs, count)); 1976 memcpy_fromio(dst, ofs, len); 1977 1978 count -= len; 1979 pageofs = (pageofs + len) & Page_mask; 1980 if (pageofs == 0 && ++pageno == epage) 1981 pageno = spage; 1982 } 1983 head = (head + total) & rx_mask; 1984 } 1985 writew(head, ofsAddr + RXrptr); 1986 if (readb(ofsAddr + FlagStat) & Xoff_state) { 1987 moxaLowWaterChk = 1; 1988 port->lowChkFlag = 1; 1989 } 1990 return total; 1991} 1992 1993 1994static int MoxaPortTxQueue(struct moxa_port *port) 1995{ 1996 void __iomem *ofsAddr = port->tableAddr; 1997 u16 rptr, wptr, mask; 1998 1999 rptr = readw(ofsAddr + TXrptr); 2000 wptr = readw(ofsAddr + TXwptr); 2001 mask = readw(ofsAddr + TX_mask); 2002 return (wptr - rptr) & mask; 2003} 2004 2005static int MoxaPortTxFree(struct moxa_port *port) 2006{ 2007 void __iomem *ofsAddr = port->tableAddr; 2008 u16 rptr, wptr, mask; 2009 2010 rptr = readw(ofsAddr + TXrptr); 2011 wptr = readw(ofsAddr + TXwptr); 2012 mask = readw(ofsAddr + TX_mask); 2013 return mask - ((wptr - rptr) & mask); 2014} 2015 2016static int MoxaPortRxQueue(struct moxa_port *port) 2017{ 2018 void __iomem *ofsAddr = port->tableAddr; 2019 u16 rptr, wptr, mask; 2020 2021 rptr = readw(ofsAddr + RXrptr); 2022 wptr = readw(ofsAddr + RXwptr); 2023 mask = readw(ofsAddr + RX_mask); 2024 return (wptr - rptr) & mask; 2025} 2026 2027static void MoxaPortTxDisable(struct moxa_port *port) 2028{ 2029 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code); 2030} 2031 2032static void MoxaPortTxEnable(struct moxa_port *port) 2033{ 2034 moxafunc(port->tableAddr, FC_SetXonState, Magic_code); 2035} 2036 2037static int moxa_get_serial_info(struct moxa_port *info, 2038 struct serial_struct __user *retinfo) 2039{ 2040 struct serial_struct tmp = { 2041 .type = info->type, 2042 .line = info->port.tty->index, 2043 .flags = info->port.flags, 2044 .baud_base = 921600, 2045 .close_delay = info->port.close_delay 2046 }; 2047 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0; 2048} 2049 2050 2051static int moxa_set_serial_info(struct moxa_port *info, 2052 struct serial_struct __user *new_info) 2053{ 2054 struct serial_struct new_serial; 2055 2056 if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) 2057 return -EFAULT; 2058 2059 if (new_serial.irq != 0 || new_serial.port != 0 || 2060 new_serial.custom_divisor != 0 || 2061 new_serial.baud_base != 921600) 2062 return -EPERM; 2063 2064 if (!capable(CAP_SYS_ADMIN)) { 2065 if (((new_serial.flags & ~ASYNC_USR_MASK) != 2066 (info->port.flags & ~ASYNC_USR_MASK))) 2067 return -EPERM; 2068 } else 2069 info->port.close_delay = new_serial.close_delay * HZ / 100; 2070 2071 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS); 2072 new_serial.flags |= (info->port.flags & ASYNC_FLAGS); 2073 2074 MoxaSetFifo(info, new_serial.type == PORT_16550A); 2075 2076 info->type = new_serial.type; 2077 return 0; 2078} 2079 2080 2081 2082/***************************************************************************** 2083 * Static local functions: * 2084 *****************************************************************************/ 2085 2086static void MoxaSetFifo(struct moxa_port *port, int enable) 2087{ 2088 void __iomem *ofsAddr = port->tableAddr; 2089 2090 if (!enable) { 2091 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0); 2092 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1); 2093 } else { 2094 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3); 2095 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16); 2096 } 2097} 2098