moxa.c revision 08d01c792568ba07d2bcf5202dbc8484dbff6747
1/*****************************************************************************/ 2/* 3 * moxa.c -- MOXA Intellio family multiport serial driver. 4 * 5 * Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com.tw). 6 * 7 * This code is loosely based on the Linux serial driver, written by 8 * Linus Torvalds, Theodore T'so and others. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 */ 15 16/* 17 * MOXA Intellio Series Driver 18 * for : LINUX 19 * date : 1999/1/7 20 * version : 5.1 21 */ 22 23#include <linux/module.h> 24#include <linux/types.h> 25#include <linux/mm.h> 26#include <linux/ioport.h> 27#include <linux/errno.h> 28#include <linux/firmware.h> 29#include <linux/signal.h> 30#include <linux/sched.h> 31#include <linux/timer.h> 32#include <linux/interrupt.h> 33#include <linux/tty.h> 34#include <linux/tty_flip.h> 35#include <linux/major.h> 36#include <linux/string.h> 37#include <linux/fcntl.h> 38#include <linux/ptrace.h> 39#include <linux/serial.h> 40#include <linux/tty_driver.h> 41#include <linux/delay.h> 42#include <linux/pci.h> 43#include <linux/init.h> 44#include <linux/bitops.h> 45 46#include <asm/system.h> 47#include <asm/io.h> 48#include <asm/uaccess.h> 49 50#include "moxa.h" 51 52#define MOXA_VERSION "5.1k" 53 54#define MOXA_FW_HDRLEN 32 55 56#define MOXAMAJOR 172 57 58#define MAX_BOARDS 4 /* Don't change this value */ 59#define MAX_PORTS_PER_BOARD 32 /* Don't change this value */ 60#define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD) 61 62#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \ 63 (brd)->boardType == MOXA_BOARD_C320_PCI) 64 65/* 66 * Define the Moxa PCI vendor and device IDs. 67 */ 68#define MOXA_BUS_TYPE_ISA 0 69#define MOXA_BUS_TYPE_PCI 1 70 71enum { 72 MOXA_BOARD_C218_PCI = 1, 73 MOXA_BOARD_C218_ISA, 74 MOXA_BOARD_C320_PCI, 75 MOXA_BOARD_C320_ISA, 76 MOXA_BOARD_CP204J, 77}; 78 79static char *moxa_brdname[] = 80{ 81 "C218 Turbo PCI series", 82 "C218 Turbo ISA series", 83 "C320 Turbo PCI series", 84 "C320 Turbo ISA series", 85 "CP-204J series", 86}; 87 88#ifdef CONFIG_PCI 89static struct pci_device_id moxa_pcibrds[] = { 90 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218), 91 .driver_data = MOXA_BOARD_C218_PCI }, 92 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320), 93 .driver_data = MOXA_BOARD_C320_PCI }, 94 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J), 95 .driver_data = MOXA_BOARD_CP204J }, 96 { 0 } 97}; 98MODULE_DEVICE_TABLE(pci, moxa_pcibrds); 99#endif /* CONFIG_PCI */ 100 101struct moxa_port; 102 103static struct moxa_board_conf { 104 int boardType; 105 int numPorts; 106 int busType; 107 108 unsigned int ready; 109 110 struct moxa_port *ports; 111 112 void __iomem *basemem; 113 void __iomem *intNdx; 114 void __iomem *intPend; 115 void __iomem *intTable; 116} moxa_boards[MAX_BOARDS]; 117 118struct mxser_mstatus { 119 tcflag_t cflag; 120 int cts; 121 int dsr; 122 int ri; 123 int dcd; 124}; 125 126struct moxaq_str { 127 int inq; 128 int outq; 129}; 130 131struct moxa_port { 132 struct moxa_board_conf *board; 133 struct tty_struct *tty; 134 void __iomem *tableAddr; 135 136 int type; 137 int close_delay; 138 unsigned int count; 139 int asyncflags; 140 int cflag; 141 unsigned long statusflags; 142 wait_queue_head_t open_wait; 143 144 u8 DCDState; 145 u8 lineCtrl; 146 u8 lowChkFlag; 147}; 148 149struct mon_str { 150 int tick; 151 int rxcnt[MAX_PORTS]; 152 int txcnt[MAX_PORTS]; 153}; 154 155/* statusflags */ 156#define TXSTOPPED 0x1 157#define LOWWAIT 0x2 158#define EMPTYWAIT 0x4 159#define THROTTLE 0x8 160 161#define SERIAL_DO_RESTART 162 163#define WAKEUP_CHARS 256 164 165static int ttymajor = MOXAMAJOR; 166static struct mon_str moxaLog; 167static unsigned int moxaFuncTout = HZ / 2; 168static unsigned int moxaLowWaterChk; 169static DEFINE_MUTEX(moxa_openlock); 170/* Variables for insmod */ 171#ifdef MODULE 172static unsigned long baseaddr[MAX_BOARDS]; 173static unsigned int type[MAX_BOARDS]; 174static unsigned int numports[MAX_BOARDS]; 175#endif 176 177MODULE_AUTHOR("William Chen"); 178MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver"); 179MODULE_LICENSE("GPL"); 180#ifdef MODULE 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#endif 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_throttle(struct tty_struct *); 200static void moxa_unthrottle(struct tty_struct *); 201static void moxa_set_termios(struct tty_struct *, struct ktermios *); 202static void moxa_stop(struct tty_struct *); 203static void moxa_start(struct tty_struct *); 204static void moxa_hangup(struct tty_struct *); 205static int moxa_tiocmget(struct tty_struct *tty, struct file *file); 206static int moxa_tiocmset(struct tty_struct *tty, struct file *file, 207 unsigned int set, unsigned int clear); 208static void moxa_poll(unsigned long); 209static void moxa_set_tty_param(struct tty_struct *, struct ktermios *); 210static void moxa_setup_empty_event(struct tty_struct *); 211static void moxa_shut_down(struct moxa_port *); 212/* 213 * moxa board interface functions: 214 */ 215static void MoxaPortEnable(struct moxa_port *); 216static void MoxaPortDisable(struct moxa_port *); 217static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t); 218static int MoxaPortGetLineOut(struct moxa_port *, int *, int *); 219static void MoxaPortLineCtrl(struct moxa_port *, int, int); 220static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int); 221static int MoxaPortLineStatus(struct moxa_port *); 222static void MoxaPortFlushData(struct moxa_port *, int); 223static int MoxaPortWriteData(struct moxa_port *, const unsigned char *, int); 224static int MoxaPortReadData(struct moxa_port *); 225static int MoxaPortTxQueue(struct moxa_port *); 226static int MoxaPortRxQueue(struct moxa_port *); 227static int MoxaPortTxFree(struct moxa_port *); 228static void MoxaPortTxDisable(struct moxa_port *); 229static void MoxaPortTxEnable(struct moxa_port *); 230static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *); 231static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *); 232static void MoxaSetFifo(struct moxa_port *port, int enable); 233 234/* 235 * I/O functions 236 */ 237 238static void moxa_wait_finish(void __iomem *ofsAddr) 239{ 240 unsigned long end = jiffies + moxaFuncTout; 241 242 while (readw(ofsAddr + FuncCode) != 0) 243 if (time_after(jiffies, end)) 244 return; 245 if (readw(ofsAddr + FuncCode) != 0 && printk_ratelimit()) 246 printk(KERN_WARNING "moxa function expired\n"); 247} 248 249static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg) 250{ 251 writew(arg, ofsAddr + FuncArg); 252 writew(cmd, ofsAddr + FuncCode); 253 moxa_wait_finish(ofsAddr); 254} 255 256static void moxa_low_water_check(void __iomem *ofsAddr) 257{ 258 u16 rptr, wptr, mask, len; 259 260 if (readb(ofsAddr + FlagStat) & Xoff_state) { 261 rptr = readw(ofsAddr + RXrptr); 262 wptr = readw(ofsAddr + RXwptr); 263 mask = readw(ofsAddr + RX_mask); 264 len = (wptr - rptr) & mask; 265 if (len <= Low_water) 266 moxafunc(ofsAddr, FC_SendXon, 0); 267 } 268} 269 270/* 271 * TTY operations 272 */ 273 274static int moxa_ioctl(struct tty_struct *tty, struct file *file, 275 unsigned int cmd, unsigned long arg) 276{ 277 struct moxa_port *ch = tty->driver_data; 278 void __user *argp = (void __user *)arg; 279 int status, ret = 0; 280 281 if (tty->index == MAX_PORTS) { 282 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE && 283 cmd != MOXA_GETMSTATUS) 284 return -EINVAL; 285 } else if (!ch) 286 return -ENODEV; 287 288 switch (cmd) { 289 case MOXA_GETDATACOUNT: 290 moxaLog.tick = jiffies; 291 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog))) 292 ret = -EFAULT; 293 break; 294 case MOXA_FLUSH_QUEUE: 295 MoxaPortFlushData(ch, arg); 296 break; 297 case MOXA_GET_IOQUEUE: { 298 struct moxaq_str __user *argm = argp; 299 struct moxaq_str tmp; 300 struct moxa_port *p; 301 unsigned int i, j; 302 303 mutex_lock(&moxa_openlock); 304 for (i = 0; i < MAX_BOARDS; i++) { 305 p = moxa_boards[i].ports; 306 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) { 307 memset(&tmp, 0, sizeof(tmp)); 308 if (moxa_boards[i].ready) { 309 tmp.inq = MoxaPortRxQueue(p); 310 tmp.outq = MoxaPortTxQueue(p); 311 } 312 if (copy_to_user(argm, &tmp, sizeof(tmp))) { 313 mutex_unlock(&moxa_openlock); 314 return -EFAULT; 315 } 316 } 317 } 318 mutex_unlock(&moxa_openlock); 319 break; 320 } case MOXA_GET_OQUEUE: 321 status = MoxaPortTxQueue(ch); 322 ret = put_user(status, (unsigned long __user *)argp); 323 break; 324 case MOXA_GET_IQUEUE: 325 status = MoxaPortRxQueue(ch); 326 ret = put_user(status, (unsigned long __user *)argp); 327 break; 328 case MOXA_GETMSTATUS: { 329 struct mxser_mstatus __user *argm = argp; 330 struct mxser_mstatus tmp; 331 struct moxa_port *p; 332 unsigned int i, j; 333 334 mutex_lock(&moxa_openlock); 335 for (i = 0; i < MAX_BOARDS; i++) { 336 p = moxa_boards[i].ports; 337 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) { 338 memset(&tmp, 0, sizeof(tmp)); 339 if (!moxa_boards[i].ready) 340 goto copy; 341 342 status = MoxaPortLineStatus(p); 343 if (status & 1) 344 tmp.cts = 1; 345 if (status & 2) 346 tmp.dsr = 1; 347 if (status & 4) 348 tmp.dcd = 1; 349 350 if (!p->tty || !p->tty->termios) 351 tmp.cflag = p->cflag; 352 else 353 tmp.cflag = p->tty->termios->c_cflag; 354copy: 355 if (copy_to_user(argm, &tmp, sizeof(tmp))) { 356 mutex_unlock(&moxa_openlock); 357 return -EFAULT; 358 } 359 } 360 } 361 mutex_unlock(&moxa_openlock); 362 break; 363 } 364 case TIOCGSERIAL: 365 mutex_lock(&moxa_openlock); 366 ret = moxa_get_serial_info(ch, argp); 367 mutex_unlock(&moxa_openlock); 368 break; 369 case TIOCSSERIAL: 370 mutex_lock(&moxa_openlock); 371 ret = moxa_set_serial_info(ch, argp); 372 mutex_unlock(&moxa_openlock); 373 break; 374 default: 375 ret = -ENOIOCTLCMD; 376 } 377 return ret; 378} 379 380static void moxa_break_ctl(struct tty_struct *tty, int state) 381{ 382 struct moxa_port *port = tty->driver_data; 383 384 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak, 385 Magic_code); 386} 387 388static const struct tty_operations moxa_ops = { 389 .open = moxa_open, 390 .close = moxa_close, 391 .write = moxa_write, 392 .write_room = moxa_write_room, 393 .flush_buffer = moxa_flush_buffer, 394 .chars_in_buffer = moxa_chars_in_buffer, 395 .ioctl = moxa_ioctl, 396 .throttle = moxa_throttle, 397 .unthrottle = moxa_unthrottle, 398 .set_termios = moxa_set_termios, 399 .stop = moxa_stop, 400 .start = moxa_start, 401 .hangup = moxa_hangup, 402 .break_ctl = moxa_break_ctl, 403 .tiocmget = moxa_tiocmget, 404 .tiocmset = moxa_tiocmset, 405}; 406 407static struct tty_driver *moxaDriver; 408static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0); 409static DEFINE_SPINLOCK(moxa_lock); 410 411/* 412 * HW init 413 */ 414 415static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model) 416{ 417 switch (brd->boardType) { 418 case MOXA_BOARD_C218_ISA: 419 case MOXA_BOARD_C218_PCI: 420 if (model != 1) 421 goto err; 422 break; 423 case MOXA_BOARD_CP204J: 424 if (model != 3) 425 goto err; 426 break; 427 default: 428 if (model != 2) 429 goto err; 430 break; 431 } 432 return 0; 433err: 434 return -EINVAL; 435} 436 437static int moxa_check_fw(const void *ptr) 438{ 439 const __le16 *lptr = ptr; 440 441 if (*lptr != cpu_to_le16(0x7980)) 442 return -EINVAL; 443 444 return 0; 445} 446 447static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf, 448 size_t len) 449{ 450 void __iomem *baseAddr = brd->basemem; 451 u16 tmp; 452 453 writeb(HW_reset, baseAddr + Control_reg); /* reset */ 454 msleep(10); 455 memset_io(baseAddr, 0, 4096); 456 memcpy_toio(baseAddr, buf, len); /* download BIOS */ 457 writeb(0, baseAddr + Control_reg); /* restart */ 458 459 msleep(2000); 460 461 switch (brd->boardType) { 462 case MOXA_BOARD_C218_ISA: 463 case MOXA_BOARD_C218_PCI: 464 tmp = readw(baseAddr + C218_key); 465 if (tmp != C218_KeyCode) 466 goto err; 467 break; 468 case MOXA_BOARD_CP204J: 469 tmp = readw(baseAddr + C218_key); 470 if (tmp != CP204J_KeyCode) 471 goto err; 472 break; 473 default: 474 tmp = readw(baseAddr + C320_key); 475 if (tmp != C320_KeyCode) 476 goto err; 477 tmp = readw(baseAddr + C320_status); 478 if (tmp != STS_init) { 479 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic " 480 "module not found\n"); 481 return -EIO; 482 } 483 break; 484 } 485 486 return 0; 487err: 488 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n"); 489 return -EIO; 490} 491 492static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr, 493 size_t len) 494{ 495 void __iomem *baseAddr = brd->basemem; 496 497 if (len < 7168) { 498 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n"); 499 return -EINVAL; 500 } 501 502 writew(len - 7168 - 2, baseAddr + C320bapi_len); 503 writeb(1, baseAddr + Control_reg); /* Select Page 1 */ 504 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168); 505 writeb(2, baseAddr + Control_reg); /* Select Page 2 */ 506 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168); 507 508 return 0; 509} 510 511static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr, 512 size_t len) 513{ 514 void __iomem *baseAddr = brd->basemem; 515 const u16 *uptr = ptr; 516 size_t wlen, len2, j; 517 unsigned long key, loadbuf, loadlen, checksum, checksum_ok; 518 unsigned int i, retry; 519 u16 usum, keycode; 520 521 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode : 522 C218_KeyCode; 523 524 switch (brd->boardType) { 525 case MOXA_BOARD_CP204J: 526 case MOXA_BOARD_C218_ISA: 527 case MOXA_BOARD_C218_PCI: 528 key = C218_key; 529 loadbuf = C218_LoadBuf; 530 loadlen = C218DLoad_len; 531 checksum = C218check_sum; 532 checksum_ok = C218chksum_ok; 533 break; 534 default: 535 key = C320_key; 536 keycode = C320_KeyCode; 537 loadbuf = C320_LoadBuf; 538 loadlen = C320DLoad_len; 539 checksum = C320check_sum; 540 checksum_ok = C320chksum_ok; 541 break; 542 } 543 544 usum = 0; 545 wlen = len >> 1; 546 for (i = 0; i < wlen; i++) 547 usum += le16_to_cpu(uptr[i]); 548 retry = 0; 549 do { 550 wlen = len >> 1; 551 j = 0; 552 while (wlen) { 553 len2 = (wlen > 2048) ? 2048 : wlen; 554 wlen -= len2; 555 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1); 556 j += len2 << 1; 557 558 writew(len2, baseAddr + loadlen); 559 writew(0, baseAddr + key); 560 for (i = 0; i < 100; i++) { 561 if (readw(baseAddr + key) == keycode) 562 break; 563 msleep(10); 564 } 565 if (readw(baseAddr + key) != keycode) 566 return -EIO; 567 } 568 writew(0, baseAddr + loadlen); 569 writew(usum, baseAddr + checksum); 570 writew(0, baseAddr + key); 571 for (i = 0; i < 100; i++) { 572 if (readw(baseAddr + key) == keycode) 573 break; 574 msleep(10); 575 } 576 retry++; 577 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3)); 578 if (readb(baseAddr + checksum_ok) != 1) 579 return -EIO; 580 581 writew(0, baseAddr + key); 582 for (i = 0; i < 600; i++) { 583 if (readw(baseAddr + Magic_no) == Magic_code) 584 break; 585 msleep(10); 586 } 587 if (readw(baseAddr + Magic_no) != Magic_code) 588 return -EIO; 589 590 if (MOXA_IS_320(brd)) { 591 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */ 592 writew(0x3800, baseAddr + TMS320_PORT1); 593 writew(0x3900, baseAddr + TMS320_PORT2); 594 writew(28499, baseAddr + TMS320_CLOCK); 595 } else { 596 writew(0x3200, baseAddr + TMS320_PORT1); 597 writew(0x3400, baseAddr + TMS320_PORT2); 598 writew(19999, baseAddr + TMS320_CLOCK); 599 } 600 } 601 writew(1, baseAddr + Disable_IRQ); 602 writew(0, baseAddr + Magic_no); 603 for (i = 0; i < 500; i++) { 604 if (readw(baseAddr + Magic_no) == Magic_code) 605 break; 606 msleep(10); 607 } 608 if (readw(baseAddr + Magic_no) != Magic_code) 609 return -EIO; 610 611 if (MOXA_IS_320(brd)) { 612 j = readw(baseAddr + Module_cnt); 613 if (j <= 0) 614 return -EIO; 615 brd->numPorts = j * 8; 616 writew(j, baseAddr + Module_no); 617 writew(0, baseAddr + Magic_no); 618 for (i = 0; i < 600; i++) { 619 if (readw(baseAddr + Magic_no) == Magic_code) 620 break; 621 msleep(10); 622 } 623 if (readw(baseAddr + Magic_no) != Magic_code) 624 return -EIO; 625 } 626 brd->intNdx = baseAddr + IRQindex; 627 brd->intPend = baseAddr + IRQpending; 628 brd->intTable = baseAddr + IRQtable; 629 630 return 0; 631} 632 633static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr, 634 size_t len) 635{ 636 void __iomem *ofsAddr, *baseAddr = brd->basemem; 637 struct moxa_port *port; 638 int retval, i; 639 640 if (len % 2) { 641 printk(KERN_ERR "MOXA: bios length is not even\n"); 642 return -EINVAL; 643 } 644 645 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */ 646 if (retval) 647 return retval; 648 649 switch (brd->boardType) { 650 case MOXA_BOARD_C218_ISA: 651 case MOXA_BOARD_C218_PCI: 652 case MOXA_BOARD_CP204J: 653 port = brd->ports; 654 for (i = 0; i < brd->numPorts; i++, port++) { 655 port->board = brd; 656 port->DCDState = 0; 657 port->tableAddr = baseAddr + Extern_table + 658 Extern_size * i; 659 ofsAddr = port->tableAddr; 660 writew(C218rx_mask, ofsAddr + RX_mask); 661 writew(C218tx_mask, ofsAddr + TX_mask); 662 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb); 663 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb); 664 665 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb); 666 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb); 667 668 } 669 break; 670 default: 671 port = brd->ports; 672 for (i = 0; i < brd->numPorts; i++, port++) { 673 port->board = brd; 674 port->DCDState = 0; 675 port->tableAddr = baseAddr + Extern_table + 676 Extern_size * i; 677 ofsAddr = port->tableAddr; 678 switch (brd->numPorts) { 679 case 8: 680 writew(C320p8rx_mask, ofsAddr + RX_mask); 681 writew(C320p8tx_mask, ofsAddr + TX_mask); 682 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb); 683 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb); 684 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb); 685 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb); 686 687 break; 688 case 16: 689 writew(C320p16rx_mask, ofsAddr + RX_mask); 690 writew(C320p16tx_mask, ofsAddr + TX_mask); 691 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb); 692 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb); 693 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb); 694 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb); 695 break; 696 697 case 24: 698 writew(C320p24rx_mask, ofsAddr + RX_mask); 699 writew(C320p24tx_mask, ofsAddr + TX_mask); 700 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb); 701 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb); 702 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb); 703 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb); 704 break; 705 case 32: 706 writew(C320p32rx_mask, ofsAddr + RX_mask); 707 writew(C320p32tx_mask, ofsAddr + TX_mask); 708 writew(C320p32tx_ofs, ofsAddr + Ofs_txb); 709 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb); 710 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb); 711 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb); 712 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb); 713 break; 714 } 715 } 716 break; 717 } 718 return 0; 719} 720 721static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw) 722{ 723 void *ptr = fw->data; 724 char rsn[64]; 725 u16 lens[5]; 726 size_t len; 727 unsigned int a, lenp, lencnt; 728 int ret = -EINVAL; 729 struct { 730 __le32 magic; /* 0x34303430 */ 731 u8 reserved1[2]; 732 u8 type; /* UNIX = 3 */ 733 u8 model; /* C218T=1, C320T=2, CP204=3 */ 734 u8 reserved2[8]; 735 __le16 len[5]; 736 } *hdr = ptr; 737 738 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens)); 739 740 if (fw->size < MOXA_FW_HDRLEN) { 741 strcpy(rsn, "too short (even header won't fit)"); 742 goto err; 743 } 744 if (hdr->magic != cpu_to_le32(0x30343034)) { 745 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic)); 746 goto err; 747 } 748 if (hdr->type != 3) { 749 sprintf(rsn, "not for linux, type is %u", hdr->type); 750 goto err; 751 } 752 if (moxa_check_fw_model(brd, hdr->model)) { 753 sprintf(rsn, "not for this card, model is %u", hdr->model); 754 goto err; 755 } 756 757 len = MOXA_FW_HDRLEN; 758 lencnt = hdr->model == 2 ? 5 : 3; 759 for (a = 0; a < ARRAY_SIZE(lens); a++) { 760 lens[a] = le16_to_cpu(hdr->len[a]); 761 if (lens[a] && len + lens[a] <= fw->size && 762 moxa_check_fw(&fw->data[len])) 763 printk(KERN_WARNING "MOXA firmware: unexpected input " 764 "at offset %u, but going on\n", (u32)len); 765 if (!lens[a] && a < lencnt) { 766 sprintf(rsn, "too few entries in fw file"); 767 goto err; 768 } 769 len += lens[a]; 770 } 771 772 if (len != fw->size) { 773 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size, 774 (u32)len); 775 goto err; 776 } 777 778 ptr += MOXA_FW_HDRLEN; 779 lenp = 0; /* bios */ 780 781 strcpy(rsn, "read above"); 782 783 ret = moxa_load_bios(brd, ptr, lens[lenp]); 784 if (ret) 785 goto err; 786 787 /* we skip the tty section (lens[1]), since we don't need it */ 788 ptr += lens[lenp] + lens[lenp + 1]; 789 lenp += 2; /* comm */ 790 791 if (hdr->model == 2) { 792 ret = moxa_load_320b(brd, ptr, lens[lenp]); 793 if (ret) 794 goto err; 795 /* skip another tty */ 796 ptr += lens[lenp] + lens[lenp + 1]; 797 lenp += 2; 798 } 799 800 ret = moxa_load_code(brd, ptr, lens[lenp]); 801 if (ret) 802 goto err; 803 804 return 0; 805err: 806 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn); 807 return ret; 808} 809 810static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev) 811{ 812 const struct firmware *fw; 813 const char *file; 814 struct moxa_port *p; 815 unsigned int i; 816 int ret; 817 818 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports), 819 GFP_KERNEL); 820 if (brd->ports == NULL) { 821 printk(KERN_ERR "cannot allocate memory for ports\n"); 822 ret = -ENOMEM; 823 goto err; 824 } 825 826 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) { 827 p->type = PORT_16550A; 828 p->close_delay = 5 * HZ / 10; 829 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL; 830 init_waitqueue_head(&p->open_wait); 831 } 832 833 switch (brd->boardType) { 834 case MOXA_BOARD_C218_ISA: 835 case MOXA_BOARD_C218_PCI: 836 file = "c218tunx.cod"; 837 break; 838 case MOXA_BOARD_CP204J: 839 file = "cp204unx.cod"; 840 break; 841 default: 842 file = "c320tunx.cod"; 843 break; 844 } 845 846 ret = request_firmware(&fw, file, dev); 847 if (ret) { 848 printk(KERN_ERR "request_firmware failed\n"); 849 goto err_free; 850 } 851 852 ret = moxa_load_fw(brd, fw); 853 854 release_firmware(fw); 855 856 if (ret) 857 goto err_free; 858 859 spin_lock_bh(&moxa_lock); 860 brd->ready = 1; 861 if (!timer_pending(&moxaTimer)) 862 mod_timer(&moxaTimer, jiffies + HZ / 50); 863 spin_unlock_bh(&moxa_lock); 864 865 return 0; 866err_free: 867 kfree(brd->ports); 868err: 869 return ret; 870} 871 872static void moxa_board_deinit(struct moxa_board_conf *brd) 873{ 874 unsigned int a, opened; 875 876 mutex_lock(&moxa_openlock); 877 spin_lock_bh(&moxa_lock); 878 brd->ready = 0; 879 spin_unlock_bh(&moxa_lock); 880 881 /* pci hot-un-plug support */ 882 for (a = 0; a < brd->numPorts; a++) 883 if (brd->ports[a].asyncflags & ASYNC_INITIALIZED) 884 tty_hangup(brd->ports[a].tty); 885 while (1) { 886 opened = 0; 887 for (a = 0; a < brd->numPorts; a++) 888 if (brd->ports[a].asyncflags & ASYNC_INITIALIZED) 889 opened++; 890 mutex_unlock(&moxa_openlock); 891 if (!opened) 892 break; 893 msleep(50); 894 mutex_lock(&moxa_openlock); 895 } 896 897 iounmap(brd->basemem); 898 brd->basemem = NULL; 899 kfree(brd->ports); 900} 901 902#ifdef CONFIG_PCI 903static int __devinit moxa_pci_probe(struct pci_dev *pdev, 904 const struct pci_device_id *ent) 905{ 906 struct moxa_board_conf *board; 907 unsigned int i; 908 int board_type = ent->driver_data; 909 int retval; 910 911 retval = pci_enable_device(pdev); 912 if (retval) { 913 dev_err(&pdev->dev, "can't enable pci device\n"); 914 goto err; 915 } 916 917 for (i = 0; i < MAX_BOARDS; i++) 918 if (moxa_boards[i].basemem == NULL) 919 break; 920 921 retval = -ENODEV; 922 if (i >= MAX_BOARDS) { 923 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards " 924 "found. Board is ignored.\n", MAX_BOARDS); 925 goto err; 926 } 927 928 board = &moxa_boards[i]; 929 930 retval = pci_request_region(pdev, 2, "moxa-base"); 931 if (retval) { 932 dev_err(&pdev->dev, "can't request pci region 2\n"); 933 goto err; 934 } 935 936 board->basemem = ioremap(pci_resource_start(pdev, 2), 0x4000); 937 if (board->basemem == NULL) { 938 dev_err(&pdev->dev, "can't remap io space 2\n"); 939 goto err_reg; 940 } 941 942 board->boardType = board_type; 943 switch (board_type) { 944 case MOXA_BOARD_C218_ISA: 945 case MOXA_BOARD_C218_PCI: 946 board->numPorts = 8; 947 break; 948 949 case MOXA_BOARD_CP204J: 950 board->numPorts = 4; 951 break; 952 default: 953 board->numPorts = 0; 954 break; 955 } 956 board->busType = MOXA_BUS_TYPE_PCI; 957 958 retval = moxa_init_board(board, &pdev->dev); 959 if (retval) 960 goto err_base; 961 962 pci_set_drvdata(pdev, board); 963 964 return 0; 965err_base: 966 iounmap(board->basemem); 967 board->basemem = NULL; 968err_reg: 969 pci_release_region(pdev, 2); 970err: 971 return retval; 972} 973 974static void __devexit moxa_pci_remove(struct pci_dev *pdev) 975{ 976 struct moxa_board_conf *brd = pci_get_drvdata(pdev); 977 978 moxa_board_deinit(brd); 979 980 pci_release_region(pdev, 2); 981} 982 983static struct pci_driver moxa_pci_driver = { 984 .name = "moxa", 985 .id_table = moxa_pcibrds, 986 .probe = moxa_pci_probe, 987 .remove = __devexit_p(moxa_pci_remove) 988}; 989#endif /* CONFIG_PCI */ 990 991static int __init moxa_init(void) 992{ 993 unsigned int isabrds = 0; 994 int retval = 0; 995 996 printk(KERN_INFO "MOXA Intellio family driver version %s\n", 997 MOXA_VERSION); 998 moxaDriver = alloc_tty_driver(MAX_PORTS + 1); 999 if (!moxaDriver) 1000 return -ENOMEM; 1001 1002 moxaDriver->owner = THIS_MODULE; 1003 moxaDriver->name = "ttyMX"; 1004 moxaDriver->major = ttymajor; 1005 moxaDriver->minor_start = 0; 1006 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL; 1007 moxaDriver->subtype = SERIAL_TYPE_NORMAL; 1008 moxaDriver->init_termios = tty_std_termios; 1009 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL; 1010 moxaDriver->init_termios.c_ispeed = 9600; 1011 moxaDriver->init_termios.c_ospeed = 9600; 1012 moxaDriver->flags = TTY_DRIVER_REAL_RAW; 1013 tty_set_operations(moxaDriver, &moxa_ops); 1014 1015 if (tty_register_driver(moxaDriver)) { 1016 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n"); 1017 put_tty_driver(moxaDriver); 1018 return -1; 1019 } 1020 1021 /* Find the boards defined from module args. */ 1022#ifdef MODULE 1023 { 1024 struct moxa_board_conf *brd = moxa_boards; 1025 unsigned int i; 1026 for (i = 0; i < MAX_BOARDS; i++) { 1027 if (!baseaddr[i]) 1028 break; 1029 if (type[i] == MOXA_BOARD_C218_ISA || 1030 type[i] == MOXA_BOARD_C320_ISA) { 1031 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n", 1032 isabrds + 1, moxa_brdname[type[i] - 1], 1033 baseaddr[i]); 1034 brd->boardType = type[i]; 1035 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 : 1036 numports[i]; 1037 brd->busType = MOXA_BUS_TYPE_ISA; 1038 brd->basemem = ioremap(baseaddr[i], 0x4000); 1039 if (!brd->basemem) { 1040 printk(KERN_ERR "MOXA: can't remap %lx\n", 1041 baseaddr[i]); 1042 continue; 1043 } 1044 if (moxa_init_board(brd, NULL)) { 1045 iounmap(brd->basemem); 1046 brd->basemem = NULL; 1047 continue; 1048 } 1049 1050 brd++; 1051 isabrds++; 1052 } 1053 } 1054 } 1055#endif 1056 1057#ifdef CONFIG_PCI 1058 retval = pci_register_driver(&moxa_pci_driver); 1059 if (retval) { 1060 printk(KERN_ERR "Can't register MOXA pci driver!\n"); 1061 if (isabrds) 1062 retval = 0; 1063 } 1064#endif 1065 1066 return retval; 1067} 1068 1069static void __exit moxa_exit(void) 1070{ 1071 unsigned int i; 1072 1073#ifdef CONFIG_PCI 1074 pci_unregister_driver(&moxa_pci_driver); 1075#endif 1076 1077 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */ 1078 if (moxa_boards[i].ready) 1079 moxa_board_deinit(&moxa_boards[i]); 1080 1081 del_timer_sync(&moxaTimer); 1082 1083 if (tty_unregister_driver(moxaDriver)) 1084 printk(KERN_ERR "Couldn't unregister MOXA Intellio family " 1085 "serial driver\n"); 1086 put_tty_driver(moxaDriver); 1087} 1088 1089module_init(moxa_init); 1090module_exit(moxa_exit); 1091 1092static void moxa_close_port(struct moxa_port *ch) 1093{ 1094 moxa_shut_down(ch); 1095 MoxaPortFlushData(ch, 2); 1096 ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE; 1097 ch->tty->driver_data = NULL; 1098 ch->tty = NULL; 1099} 1100 1101static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp, 1102 struct moxa_port *ch) 1103{ 1104 DEFINE_WAIT(wait); 1105 int retval = 0; 1106 u8 dcd; 1107 1108 while (1) { 1109 prepare_to_wait(&ch->open_wait, &wait, TASK_INTERRUPTIBLE); 1110 if (tty_hung_up_p(filp)) { 1111#ifdef SERIAL_DO_RESTART 1112 retval = -ERESTARTSYS; 1113#else 1114 retval = -EAGAIN; 1115#endif 1116 break; 1117 } 1118 spin_lock_bh(&moxa_lock); 1119 dcd = ch->DCDState; 1120 spin_unlock_bh(&moxa_lock); 1121 if (dcd) 1122 break; 1123 1124 if (signal_pending(current)) { 1125 retval = -ERESTARTSYS; 1126 break; 1127 } 1128 schedule(); 1129 } 1130 finish_wait(&ch->open_wait, &wait); 1131 1132 return retval; 1133} 1134 1135static int moxa_open(struct tty_struct *tty, struct file *filp) 1136{ 1137 struct moxa_board_conf *brd; 1138 struct moxa_port *ch; 1139 int port; 1140 int retval; 1141 1142 port = tty->index; 1143 if (port == MAX_PORTS) { 1144 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM; 1145 } 1146 if (mutex_lock_interruptible(&moxa_openlock)) 1147 return -ERESTARTSYS; 1148 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD]; 1149 if (!brd->ready) { 1150 mutex_unlock(&moxa_openlock); 1151 return -ENODEV; 1152 } 1153 1154 ch = &brd->ports[port % MAX_PORTS_PER_BOARD]; 1155 ch->count++; 1156 tty->driver_data = ch; 1157 ch->tty = tty; 1158 if (!(ch->asyncflags & ASYNC_INITIALIZED)) { 1159 ch->statusflags = 0; 1160 moxa_set_tty_param(tty, tty->termios); 1161 MoxaPortLineCtrl(ch, 1, 1); 1162 MoxaPortEnable(ch); 1163 MoxaSetFifo(ch, ch->type == PORT_16550A); 1164 ch->asyncflags |= ASYNC_INITIALIZED; 1165 } 1166 mutex_unlock(&moxa_openlock); 1167 1168 retval = 0; 1169 if (!(filp->f_flags & O_NONBLOCK) && !C_CLOCAL(tty)) 1170 retval = moxa_block_till_ready(tty, filp, ch); 1171 mutex_lock(&moxa_openlock); 1172 if (retval) { 1173 if (ch->count) /* 0 means already hung up... */ 1174 if (--ch->count == 0) 1175 moxa_close_port(ch); 1176 } else 1177 ch->asyncflags |= ASYNC_NORMAL_ACTIVE; 1178 mutex_unlock(&moxa_openlock); 1179 1180 return retval; 1181} 1182 1183static void moxa_close(struct tty_struct *tty, struct file *filp) 1184{ 1185 struct moxa_port *ch; 1186 int port; 1187 1188 port = tty->index; 1189 if (port == MAX_PORTS || tty_hung_up_p(filp)) 1190 return; 1191 1192 mutex_lock(&moxa_openlock); 1193 ch = tty->driver_data; 1194 if (ch == NULL) 1195 goto unlock; 1196 if (tty->count == 1 && ch->count != 1) { 1197 printk(KERN_WARNING "moxa_close: bad serial port count; " 1198 "tty->count is 1, ch->count is %d\n", ch->count); 1199 ch->count = 1; 1200 } 1201 if (--ch->count < 0) { 1202 printk(KERN_WARNING "moxa_close: bad serial port count, " 1203 "device=%s\n", tty->name); 1204 ch->count = 0; 1205 } 1206 if (ch->count) 1207 goto unlock; 1208 1209 ch->cflag = tty->termios->c_cflag; 1210 if (ch->asyncflags & ASYNC_INITIALIZED) { 1211 moxa_setup_empty_event(tty); 1212 tty_wait_until_sent(tty, 30 * HZ); /* 30 seconds timeout */ 1213 } 1214 1215 moxa_close_port(ch); 1216unlock: 1217 mutex_unlock(&moxa_openlock); 1218} 1219 1220static int moxa_write(struct tty_struct *tty, 1221 const unsigned char *buf, int count) 1222{ 1223 struct moxa_port *ch = tty->driver_data; 1224 int len; 1225 1226 if (ch == NULL) 1227 return 0; 1228 1229 spin_lock_bh(&moxa_lock); 1230 len = MoxaPortWriteData(ch, buf, count); 1231 spin_unlock_bh(&moxa_lock); 1232 1233 ch->statusflags |= LOWWAIT; 1234 return len; 1235} 1236 1237static int moxa_write_room(struct tty_struct *tty) 1238{ 1239 struct moxa_port *ch; 1240 1241 if (tty->stopped) 1242 return 0; 1243 ch = tty->driver_data; 1244 if (ch == NULL) 1245 return 0; 1246 return MoxaPortTxFree(ch); 1247} 1248 1249static void moxa_flush_buffer(struct tty_struct *tty) 1250{ 1251 struct moxa_port *ch = tty->driver_data; 1252 1253 if (ch == NULL) 1254 return; 1255 MoxaPortFlushData(ch, 1); 1256 tty_wakeup(tty); 1257} 1258 1259static int moxa_chars_in_buffer(struct tty_struct *tty) 1260{ 1261 struct moxa_port *ch = tty->driver_data; 1262 int chars; 1263 1264 /* 1265 * Sigh...I have to check if driver_data is NULL here, because 1266 * if an open() fails, the TTY subsystem eventually calls 1267 * tty_wait_until_sent(), which calls the driver's chars_in_buffer() 1268 * routine. And since the open() failed, we return 0 here. TDJ 1269 */ 1270 if (ch == NULL) 1271 return 0; 1272 chars = MoxaPortTxQueue(ch); 1273 if (chars) { 1274 /* 1275 * Make it possible to wakeup anything waiting for output 1276 * in tty_ioctl.c, etc. 1277 */ 1278 if (!(ch->statusflags & EMPTYWAIT)) 1279 moxa_setup_empty_event(tty); 1280 } 1281 return chars; 1282} 1283 1284static int moxa_tiocmget(struct tty_struct *tty, struct file *file) 1285{ 1286 struct moxa_port *ch; 1287 int flag = 0, dtr, rts; 1288 1289 mutex_lock(&moxa_openlock); 1290 ch = tty->driver_data; 1291 if (!ch) { 1292 mutex_unlock(&moxa_openlock); 1293 return -EINVAL; 1294 } 1295 1296 MoxaPortGetLineOut(ch, &dtr, &rts); 1297 if (dtr) 1298 flag |= TIOCM_DTR; 1299 if (rts) 1300 flag |= TIOCM_RTS; 1301 dtr = MoxaPortLineStatus(ch); 1302 if (dtr & 1) 1303 flag |= TIOCM_CTS; 1304 if (dtr & 2) 1305 flag |= TIOCM_DSR; 1306 if (dtr & 4) 1307 flag |= TIOCM_CD; 1308 mutex_unlock(&moxa_openlock); 1309 return flag; 1310} 1311 1312static int moxa_tiocmset(struct tty_struct *tty, struct file *file, 1313 unsigned int set, unsigned int clear) 1314{ 1315 struct moxa_port *ch; 1316 int port; 1317 int dtr, rts; 1318 1319 port = tty->index; 1320 mutex_lock(&moxa_openlock); 1321 ch = tty->driver_data; 1322 if (!ch) { 1323 mutex_unlock(&moxa_openlock); 1324 return -EINVAL; 1325 } 1326 1327 MoxaPortGetLineOut(ch, &dtr, &rts); 1328 if (set & TIOCM_RTS) 1329 rts = 1; 1330 if (set & TIOCM_DTR) 1331 dtr = 1; 1332 if (clear & TIOCM_RTS) 1333 rts = 0; 1334 if (clear & TIOCM_DTR) 1335 dtr = 0; 1336 MoxaPortLineCtrl(ch, dtr, rts); 1337 mutex_unlock(&moxa_openlock); 1338 return 0; 1339} 1340 1341static void moxa_throttle(struct tty_struct *tty) 1342{ 1343 struct moxa_port *ch = tty->driver_data; 1344 1345 ch->statusflags |= THROTTLE; 1346} 1347 1348static void moxa_unthrottle(struct tty_struct *tty) 1349{ 1350 struct moxa_port *ch = tty->driver_data; 1351 1352 ch->statusflags &= ~THROTTLE; 1353} 1354 1355static void moxa_set_termios(struct tty_struct *tty, 1356 struct ktermios *old_termios) 1357{ 1358 struct moxa_port *ch = tty->driver_data; 1359 1360 if (ch == NULL) 1361 return; 1362 moxa_set_tty_param(tty, old_termios); 1363 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1364 wake_up_interruptible(&ch->open_wait); 1365} 1366 1367static void moxa_stop(struct tty_struct *tty) 1368{ 1369 struct moxa_port *ch = tty->driver_data; 1370 1371 if (ch == NULL) 1372 return; 1373 MoxaPortTxDisable(ch); 1374 ch->statusflags |= TXSTOPPED; 1375} 1376 1377 1378static void moxa_start(struct tty_struct *tty) 1379{ 1380 struct moxa_port *ch = tty->driver_data; 1381 1382 if (ch == NULL) 1383 return; 1384 1385 if (!(ch->statusflags & TXSTOPPED)) 1386 return; 1387 1388 MoxaPortTxEnable(ch); 1389 ch->statusflags &= ~TXSTOPPED; 1390} 1391 1392static void moxa_hangup(struct tty_struct *tty) 1393{ 1394 struct moxa_port *ch; 1395 1396 mutex_lock(&moxa_openlock); 1397 ch = tty->driver_data; 1398 if (ch == NULL) { 1399 mutex_unlock(&moxa_openlock); 1400 return; 1401 } 1402 ch->count = 0; 1403 moxa_close_port(ch); 1404 mutex_unlock(&moxa_openlock); 1405 1406 wake_up_interruptible(&ch->open_wait); 1407} 1408 1409static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd) 1410{ 1411 dcd = !!dcd; 1412 1413 if (dcd != p->DCDState && p->tty && C_CLOCAL(p->tty)) { 1414 if (!dcd) 1415 tty_hangup(p->tty); 1416 } 1417 p->DCDState = dcd; 1418} 1419 1420static int moxa_poll_port(struct moxa_port *p, unsigned int handle, 1421 u16 __iomem *ip) 1422{ 1423 struct tty_struct *tty = p->tty; 1424 void __iomem *ofsAddr; 1425 unsigned int inited = p->asyncflags & ASYNC_INITIALIZED; 1426 u16 intr; 1427 1428 if (tty) { 1429 if ((p->statusflags & EMPTYWAIT) && 1430 MoxaPortTxQueue(p) == 0) { 1431 p->statusflags &= ~EMPTYWAIT; 1432 tty_wakeup(tty); 1433 } 1434 if ((p->statusflags & LOWWAIT) && !tty->stopped && 1435 MoxaPortTxQueue(p) <= WAKEUP_CHARS) { 1436 p->statusflags &= ~LOWWAIT; 1437 tty_wakeup(tty); 1438 } 1439 1440 if (inited && !(p->statusflags & THROTTLE) && 1441 MoxaPortRxQueue(p) > 0) { /* RX */ 1442 MoxaPortReadData(p); 1443 tty_schedule_flip(tty); 1444 } 1445 } else { 1446 p->statusflags &= ~EMPTYWAIT; 1447 MoxaPortFlushData(p, 0); /* flush RX */ 1448 } 1449 1450 if (!handle) /* nothing else to do */ 1451 return 0; 1452 1453 intr = readw(ip); /* port irq status */ 1454 if (intr == 0) 1455 return 0; 1456 1457 writew(0, ip); /* ACK port */ 1458 ofsAddr = p->tableAddr; 1459 if (intr & IntrTx) /* disable tx intr */ 1460 writew(readw(ofsAddr + HostStat) & ~WakeupTx, 1461 ofsAddr + HostStat); 1462 1463 if (!inited) 1464 return 0; 1465 1466 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */ 1467 tty_insert_flip_char(tty, 0, TTY_BREAK); 1468 tty_schedule_flip(tty); 1469 } 1470 1471 if (intr & IntrLine) 1472 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state); 1473 1474 return 0; 1475} 1476 1477static void moxa_poll(unsigned long ignored) 1478{ 1479 struct moxa_board_conf *brd; 1480 u16 __iomem *ip; 1481 unsigned int card, port, served = 0; 1482 1483 spin_lock(&moxa_lock); 1484 for (card = 0; card < MAX_BOARDS; card++) { 1485 brd = &moxa_boards[card]; 1486 if (!brd->ready) 1487 continue; 1488 1489 served++; 1490 1491 ip = NULL; 1492 if (readb(brd->intPend) == 0xff) 1493 ip = brd->intTable + readb(brd->intNdx); 1494 1495 for (port = 0; port < brd->numPorts; port++) 1496 moxa_poll_port(&brd->ports[port], !!ip, ip + port); 1497 1498 if (ip) 1499 writeb(0, brd->intPend); /* ACK */ 1500 1501 if (moxaLowWaterChk) { 1502 struct moxa_port *p = brd->ports; 1503 for (port = 0; port < brd->numPorts; port++, p++) 1504 if (p->lowChkFlag) { 1505 p->lowChkFlag = 0; 1506 moxa_low_water_check(p->tableAddr); 1507 } 1508 } 1509 } 1510 moxaLowWaterChk = 0; 1511 1512 if (served) 1513 mod_timer(&moxaTimer, jiffies + HZ / 50); 1514 spin_unlock(&moxa_lock); 1515} 1516 1517/******************************************************************************/ 1518 1519static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios) 1520{ 1521 register struct ktermios *ts = tty->termios; 1522 struct moxa_port *ch = tty->driver_data; 1523 int rts, cts, txflow, rxflow, xany, baud; 1524 1525 rts = cts = txflow = rxflow = xany = 0; 1526 if (ts->c_cflag & CRTSCTS) 1527 rts = cts = 1; 1528 if (ts->c_iflag & IXON) 1529 txflow = 1; 1530 if (ts->c_iflag & IXOFF) 1531 rxflow = 1; 1532 if (ts->c_iflag & IXANY) 1533 xany = 1; 1534 1535 /* Clear the features we don't support */ 1536 ts->c_cflag &= ~CMSPAR; 1537 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany); 1538 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty)); 1539 if (baud == -1) 1540 baud = tty_termios_baud_rate(old_termios); 1541 /* Not put the baud rate into the termios data */ 1542 tty_encode_baud_rate(tty, baud, baud); 1543} 1544 1545static void moxa_setup_empty_event(struct tty_struct *tty) 1546{ 1547 struct moxa_port *ch = tty->driver_data; 1548 1549 spin_lock_bh(&moxa_lock); 1550 ch->statusflags |= EMPTYWAIT; 1551 spin_unlock_bh(&moxa_lock); 1552} 1553 1554static void moxa_shut_down(struct moxa_port *ch) 1555{ 1556 struct tty_struct *tp = ch->tty; 1557 1558 if (!(ch->asyncflags & ASYNC_INITIALIZED)) 1559 return; 1560 1561 MoxaPortDisable(ch); 1562 1563 /* 1564 * If we're a modem control device and HUPCL is on, drop RTS & DTR. 1565 */ 1566 if (C_HUPCL(tp)) 1567 MoxaPortLineCtrl(ch, 0, 0); 1568 1569 spin_lock_bh(&moxa_lock); 1570 ch->asyncflags &= ~ASYNC_INITIALIZED; 1571 spin_unlock_bh(&moxa_lock); 1572} 1573 1574/***************************************************************************** 1575 * Driver level functions: * 1576 *****************************************************************************/ 1577 1578static void MoxaPortFlushData(struct moxa_port *port, int mode) 1579{ 1580 void __iomem *ofsAddr; 1581 if (mode < 0 || mode > 2) 1582 return; 1583 ofsAddr = port->tableAddr; 1584 moxafunc(ofsAddr, FC_FlushQueue, mode); 1585 if (mode != 1) { 1586 port->lowChkFlag = 0; 1587 moxa_low_water_check(ofsAddr); 1588 } 1589} 1590 1591/* 1592 * Moxa Port Number Description: 1593 * 1594 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And, 1595 * the port number using in MOXA driver functions will be 0 to 31 for 1596 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96 1597 * to 127 for fourth. For example, if you setup three MOXA boards, 1598 * first board is C218, second board is C320-16 and third board is 1599 * C320-32. The port number of first board (C218 - 8 ports) is from 1600 * 0 to 7. The port number of second board (C320 - 16 ports) is form 1601 * 32 to 47. The port number of third board (C320 - 32 ports) is from 1602 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to 1603 * 127 will be invalid. 1604 * 1605 * 1606 * Moxa Functions Description: 1607 * 1608 * Function 1: Driver initialization routine, this routine must be 1609 * called when initialized driver. 1610 * Syntax: 1611 * void MoxaDriverInit(); 1612 * 1613 * 1614 * Function 2: Moxa driver private IOCTL command processing. 1615 * Syntax: 1616 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port); 1617 * 1618 * unsigned int cmd : IOCTL command 1619 * unsigned long arg : IOCTL argument 1620 * int port : port number (0 - 127) 1621 * 1622 * return: 0 (OK) 1623 * -EINVAL 1624 * -ENOIOCTLCMD 1625 * 1626 * 1627 * Function 6: Enable this port to start Tx/Rx data. 1628 * Syntax: 1629 * void MoxaPortEnable(int port); 1630 * int port : port number (0 - 127) 1631 * 1632 * 1633 * Function 7: Disable this port 1634 * Syntax: 1635 * void MoxaPortDisable(int port); 1636 * int port : port number (0 - 127) 1637 * 1638 * 1639 * Function 10: Setting baud rate of this port. 1640 * Syntax: 1641 * speed_t MoxaPortSetBaud(int port, speed_t baud); 1642 * int port : port number (0 - 127) 1643 * long baud : baud rate (50 - 115200) 1644 * 1645 * return: 0 : this port is invalid or baud < 50 1646 * 50 - 115200 : the real baud rate set to the port, if 1647 * the argument baud is large than maximun 1648 * available baud rate, the real setting 1649 * baud rate will be the maximun baud rate. 1650 * 1651 * 1652 * Function 12: Configure the port. 1653 * Syntax: 1654 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud); 1655 * int port : port number (0 - 127) 1656 * struct ktermios * termio : termio structure pointer 1657 * speed_t baud : baud rate 1658 * 1659 * return: -1 : this port is invalid or termio == NULL 1660 * 0 : setting O.K. 1661 * 1662 * 1663 * Function 13: Get the DTR/RTS state of this port. 1664 * Syntax: 1665 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState); 1666 * int port : port number (0 - 127) 1667 * int * dtrState : pointer to INT to receive the current DTR 1668 * state. (if NULL, this function will not 1669 * write to this address) 1670 * int * rtsState : pointer to INT to receive the current RTS 1671 * state. (if NULL, this function will not 1672 * write to this address) 1673 * 1674 * return: -1 : this port is invalid 1675 * 0 : O.K. 1676 * 1677 * 1678 * Function 14: Setting the DTR/RTS output state of this port. 1679 * Syntax: 1680 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState); 1681 * int port : port number (0 - 127) 1682 * int dtrState : DTR output state (0: off, 1: on) 1683 * int rtsState : RTS output state (0: off, 1: on) 1684 * 1685 * 1686 * Function 15: Setting the flow control of this port. 1687 * Syntax: 1688 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow, 1689 * int txFlow,int xany); 1690 * int port : port number (0 - 127) 1691 * int rtsFlow : H/W RTS flow control (0: no, 1: yes) 1692 * int ctsFlow : H/W CTS flow control (0: no, 1: yes) 1693 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes) 1694 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes) 1695 * int xany : S/W XANY flow control (0: no, 1: yes) 1696 * 1697 * 1698 * Function 16: Get ths line status of this port 1699 * Syntax: 1700 * int MoxaPortLineStatus(int port); 1701 * int port : port number (0 - 127) 1702 * 1703 * return: Bit 0 - CTS state (0: off, 1: on) 1704 * Bit 1 - DSR state (0: off, 1: on) 1705 * Bit 2 - DCD state (0: off, 1: on) 1706 * 1707 * 1708 * Function 19: Flush the Rx/Tx buffer data of this port. 1709 * Syntax: 1710 * void MoxaPortFlushData(int port, int mode); 1711 * int port : port number (0 - 127) 1712 * int mode 1713 * 0 : flush the Rx buffer 1714 * 1 : flush the Tx buffer 1715 * 2 : flush the Rx and Tx buffer 1716 * 1717 * 1718 * Function 20: Write data. 1719 * Syntax: 1720 * int MoxaPortWriteData(int port, unsigned char * buffer, int length); 1721 * int port : port number (0 - 127) 1722 * unsigned char * buffer : pointer to write data buffer. 1723 * int length : write data length 1724 * 1725 * return: 0 - length : real write data length 1726 * 1727 * 1728 * Function 21: Read data. 1729 * Syntax: 1730 * int MoxaPortReadData(int port, struct tty_struct *tty); 1731 * int port : port number (0 - 127) 1732 * struct tty_struct *tty : tty for data 1733 * 1734 * return: 0 - length : real read data length 1735 * 1736 * 1737 * Function 24: Get the Tx buffer current queued data bytes 1738 * Syntax: 1739 * int MoxaPortTxQueue(int port); 1740 * int port : port number (0 - 127) 1741 * 1742 * return: .. : Tx buffer current queued data bytes 1743 * 1744 * 1745 * Function 25: Get the Tx buffer current free space 1746 * Syntax: 1747 * int MoxaPortTxFree(int port); 1748 * int port : port number (0 - 127) 1749 * 1750 * return: .. : Tx buffer current free space 1751 * 1752 * 1753 * Function 26: Get the Rx buffer current queued data bytes 1754 * Syntax: 1755 * int MoxaPortRxQueue(int port); 1756 * int port : port number (0 - 127) 1757 * 1758 * return: .. : Rx buffer current queued data bytes 1759 * 1760 * 1761 * Function 28: Disable port data transmission. 1762 * Syntax: 1763 * void MoxaPortTxDisable(int port); 1764 * int port : port number (0 - 127) 1765 * 1766 * 1767 * Function 29: Enable port data transmission. 1768 * Syntax: 1769 * void MoxaPortTxEnable(int port); 1770 * int port : port number (0 - 127) 1771 * 1772 * 1773 * Function 31: Get the received BREAK signal count and reset it. 1774 * Syntax: 1775 * int MoxaPortResetBrkCnt(int port); 1776 * int port : port number (0 - 127) 1777 * 1778 * return: 0 - .. : BREAK signal count 1779 * 1780 * 1781 */ 1782 1783static void MoxaPortEnable(struct moxa_port *port) 1784{ 1785 void __iomem *ofsAddr; 1786 u16 lowwater = 512; 1787 1788 ofsAddr = port->tableAddr; 1789 writew(lowwater, ofsAddr + Low_water); 1790 if (MOXA_IS_320(port->board)) 1791 moxafunc(ofsAddr, FC_SetBreakIrq, 0); 1792 else 1793 writew(readw(ofsAddr + HostStat) | WakeupBreak, 1794 ofsAddr + HostStat); 1795 1796 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code); 1797 moxafunc(ofsAddr, FC_FlushQueue, 2); 1798 1799 moxafunc(ofsAddr, FC_EnableCH, Magic_code); 1800 MoxaPortLineStatus(port); 1801} 1802 1803static void MoxaPortDisable(struct moxa_port *port) 1804{ 1805 void __iomem *ofsAddr = port->tableAddr; 1806 1807 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */ 1808 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code); 1809 writew(0, ofsAddr + HostStat); 1810 moxafunc(ofsAddr, FC_DisableCH, Magic_code); 1811} 1812 1813static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud) 1814{ 1815 void __iomem *ofsAddr = port->tableAddr; 1816 unsigned int clock, val; 1817 speed_t max; 1818 1819 max = MOXA_IS_320(port->board) ? 460800 : 921600; 1820 if (baud < 50) 1821 return 0; 1822 if (baud > max) 1823 baud = max; 1824 clock = 921600; 1825 val = clock / baud; 1826 moxafunc(ofsAddr, FC_SetBaud, val); 1827 baud = clock / val; 1828 return baud; 1829} 1830 1831static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio, 1832 speed_t baud) 1833{ 1834 void __iomem *ofsAddr; 1835 tcflag_t cflag; 1836 tcflag_t mode = 0; 1837 1838 ofsAddr = port->tableAddr; 1839 cflag = termio->c_cflag; /* termio->c_cflag */ 1840 1841 mode = termio->c_cflag & CSIZE; 1842 if (mode == CS5) 1843 mode = MX_CS5; 1844 else if (mode == CS6) 1845 mode = MX_CS6; 1846 else if (mode == CS7) 1847 mode = MX_CS7; 1848 else if (mode == CS8) 1849 mode = MX_CS8; 1850 1851 if (termio->c_cflag & CSTOPB) { 1852 if (mode == MX_CS5) 1853 mode |= MX_STOP15; 1854 else 1855 mode |= MX_STOP2; 1856 } else 1857 mode |= MX_STOP1; 1858 1859 if (termio->c_cflag & PARENB) { 1860 if (termio->c_cflag & PARODD) 1861 mode |= MX_PARODD; 1862 else 1863 mode |= MX_PAREVEN; 1864 } else 1865 mode |= MX_PARNONE; 1866 1867 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode); 1868 1869 if (MOXA_IS_320(port->board) && baud >= 921600) 1870 return -1; 1871 1872 baud = MoxaPortSetBaud(port, baud); 1873 1874 if (termio->c_iflag & (IXON | IXOFF | IXANY)) { 1875 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg); 1876 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1); 1877 writeb(FC_SetXonXoff, ofsAddr + FuncCode); 1878 moxa_wait_finish(ofsAddr); 1879 1880 } 1881 return baud; 1882} 1883 1884static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState, 1885 int *rtsState) 1886{ 1887 if (dtrState) 1888 *dtrState = !!(port->lineCtrl & DTR_ON); 1889 if (rtsState) 1890 *rtsState = !!(port->lineCtrl & RTS_ON); 1891 1892 return 0; 1893} 1894 1895static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts) 1896{ 1897 u8 mode = 0; 1898 1899 if (dtr) 1900 mode |= DTR_ON; 1901 if (rts) 1902 mode |= RTS_ON; 1903 port->lineCtrl = mode; 1904 moxafunc(port->tableAddr, FC_LineControl, mode); 1905} 1906 1907static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts, 1908 int txflow, int rxflow, int txany) 1909{ 1910 int mode = 0; 1911 1912 if (rts) 1913 mode |= RTS_FlowCtl; 1914 if (cts) 1915 mode |= CTS_FlowCtl; 1916 if (txflow) 1917 mode |= Tx_FlowCtl; 1918 if (rxflow) 1919 mode |= Rx_FlowCtl; 1920 if (txany) 1921 mode |= IXM_IXANY; 1922 moxafunc(port->tableAddr, FC_SetFlowCtl, mode); 1923} 1924 1925static int MoxaPortLineStatus(struct moxa_port *port) 1926{ 1927 void __iomem *ofsAddr; 1928 int val; 1929 1930 ofsAddr = port->tableAddr; 1931 if (MOXA_IS_320(port->board)) { 1932 moxafunc(ofsAddr, FC_LineStatus, 0); 1933 val = readw(ofsAddr + FuncArg); 1934 } else { 1935 val = readw(ofsAddr + FlagStat) >> 4; 1936 } 1937 val &= 0x0B; 1938 if (val & 8) 1939 val |= 4; 1940 spin_lock_bh(&moxa_lock); 1941 moxa_new_dcdstate(port, val & 8); 1942 spin_unlock_bh(&moxa_lock); 1943 val &= 7; 1944 return val; 1945} 1946 1947static int MoxaPortWriteData(struct moxa_port *port, 1948 const unsigned char *buffer, int len) 1949{ 1950 void __iomem *baseAddr, *ofsAddr, *ofs; 1951 unsigned int c, total; 1952 u16 head, tail, tx_mask, spage, epage; 1953 u16 pageno, pageofs, bufhead; 1954 1955 ofsAddr = port->tableAddr; 1956 baseAddr = port->board->basemem; 1957 tx_mask = readw(ofsAddr + TX_mask); 1958 spage = readw(ofsAddr + Page_txb); 1959 epage = readw(ofsAddr + EndPage_txb); 1960 tail = readw(ofsAddr + TXwptr); 1961 head = readw(ofsAddr + TXrptr); 1962 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask); 1963 if (c > len) 1964 c = len; 1965 moxaLog.txcnt[port->tty->index] += c; 1966 total = c; 1967 if (spage == epage) { 1968 bufhead = readw(ofsAddr + Ofs_txb); 1969 writew(spage, baseAddr + Control_reg); 1970 while (c > 0) { 1971 if (head > tail) 1972 len = head - tail - 1; 1973 else 1974 len = tx_mask + 1 - tail; 1975 len = (c > len) ? len : c; 1976 ofs = baseAddr + DynPage_addr + bufhead + tail; 1977 memcpy_toio(ofs, buffer, len); 1978 buffer += len; 1979 tail = (tail + len) & tx_mask; 1980 c -= len; 1981 } 1982 } else { 1983 pageno = spage + (tail >> 13); 1984 pageofs = tail & Page_mask; 1985 while (c > 0) { 1986 len = Page_size - pageofs; 1987 if (len > c) 1988 len = c; 1989 writeb(pageno, baseAddr + Control_reg); 1990 ofs = baseAddr + DynPage_addr + pageofs; 1991 memcpy_toio(ofs, buffer, len); 1992 buffer += len; 1993 if (++pageno == epage) 1994 pageno = spage; 1995 pageofs = 0; 1996 c -= len; 1997 } 1998 tail = (tail + total) & tx_mask; 1999 } 2000 writew(tail, ofsAddr + TXwptr); 2001 writeb(1, ofsAddr + CD180TXirq); /* start to send */ 2002 return total; 2003} 2004 2005static int MoxaPortReadData(struct moxa_port *port) 2006{ 2007 struct tty_struct *tty = port->tty; 2008 unsigned char *dst; 2009 void __iomem *baseAddr, *ofsAddr, *ofs; 2010 unsigned int count, len, total; 2011 u16 tail, rx_mask, spage, epage; 2012 u16 pageno, pageofs, bufhead, head; 2013 2014 ofsAddr = port->tableAddr; 2015 baseAddr = port->board->basemem; 2016 head = readw(ofsAddr + RXrptr); 2017 tail = readw(ofsAddr + RXwptr); 2018 rx_mask = readw(ofsAddr + RX_mask); 2019 spage = readw(ofsAddr + Page_rxb); 2020 epage = readw(ofsAddr + EndPage_rxb); 2021 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1); 2022 if (count == 0) 2023 return 0; 2024 2025 total = count; 2026 moxaLog.rxcnt[tty->index] += total; 2027 if (spage == epage) { 2028 bufhead = readw(ofsAddr + Ofs_rxb); 2029 writew(spage, baseAddr + Control_reg); 2030 while (count > 0) { 2031 ofs = baseAddr + DynPage_addr + bufhead + head; 2032 len = (tail >= head) ? (tail - head) : 2033 (rx_mask + 1 - head); 2034 len = tty_prepare_flip_string(tty, &dst, 2035 min(len, count)); 2036 memcpy_fromio(dst, ofs, len); 2037 head = (head + len) & rx_mask; 2038 count -= len; 2039 } 2040 } else { 2041 pageno = spage + (head >> 13); 2042 pageofs = head & Page_mask; 2043 while (count > 0) { 2044 writew(pageno, baseAddr + Control_reg); 2045 ofs = baseAddr + DynPage_addr + pageofs; 2046 len = tty_prepare_flip_string(tty, &dst, 2047 min(Page_size - pageofs, count)); 2048 memcpy_fromio(dst, ofs, len); 2049 2050 count -= len; 2051 pageofs = (pageofs + len) & Page_mask; 2052 if (pageofs == 0 && ++pageno == epage) 2053 pageno = spage; 2054 } 2055 head = (head + total) & rx_mask; 2056 } 2057 writew(head, ofsAddr + RXrptr); 2058 if (readb(ofsAddr + FlagStat) & Xoff_state) { 2059 moxaLowWaterChk = 1; 2060 port->lowChkFlag = 1; 2061 } 2062 return total; 2063} 2064 2065 2066static int MoxaPortTxQueue(struct moxa_port *port) 2067{ 2068 void __iomem *ofsAddr = port->tableAddr; 2069 u16 rptr, wptr, mask; 2070 2071 rptr = readw(ofsAddr + TXrptr); 2072 wptr = readw(ofsAddr + TXwptr); 2073 mask = readw(ofsAddr + TX_mask); 2074 return (wptr - rptr) & mask; 2075} 2076 2077static int MoxaPortTxFree(struct moxa_port *port) 2078{ 2079 void __iomem *ofsAddr = port->tableAddr; 2080 u16 rptr, wptr, mask; 2081 2082 rptr = readw(ofsAddr + TXrptr); 2083 wptr = readw(ofsAddr + TXwptr); 2084 mask = readw(ofsAddr + TX_mask); 2085 return mask - ((wptr - rptr) & mask); 2086} 2087 2088static int MoxaPortRxQueue(struct moxa_port *port) 2089{ 2090 void __iomem *ofsAddr = port->tableAddr; 2091 u16 rptr, wptr, mask; 2092 2093 rptr = readw(ofsAddr + RXrptr); 2094 wptr = readw(ofsAddr + RXwptr); 2095 mask = readw(ofsAddr + RX_mask); 2096 return (wptr - rptr) & mask; 2097} 2098 2099static void MoxaPortTxDisable(struct moxa_port *port) 2100{ 2101 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code); 2102} 2103 2104static void MoxaPortTxEnable(struct moxa_port *port) 2105{ 2106 moxafunc(port->tableAddr, FC_SetXonState, Magic_code); 2107} 2108 2109static int moxa_get_serial_info(struct moxa_port *info, 2110 struct serial_struct __user *retinfo) 2111{ 2112 struct serial_struct tmp = { 2113 .type = info->type, 2114 .line = info->tty->index, 2115 .flags = info->asyncflags, 2116 .baud_base = 921600, 2117 .close_delay = info->close_delay 2118 }; 2119 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0; 2120} 2121 2122 2123static int moxa_set_serial_info(struct moxa_port *info, 2124 struct serial_struct __user *new_info) 2125{ 2126 struct serial_struct new_serial; 2127 2128 if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) 2129 return -EFAULT; 2130 2131 if (new_serial.irq != 0 || new_serial.port != 0 || 2132 new_serial.custom_divisor != 0 || 2133 new_serial.baud_base != 921600) 2134 return -EPERM; 2135 2136 if (!capable(CAP_SYS_ADMIN)) { 2137 if (((new_serial.flags & ~ASYNC_USR_MASK) != 2138 (info->asyncflags & ~ASYNC_USR_MASK))) 2139 return -EPERM; 2140 } else 2141 info->close_delay = new_serial.close_delay * HZ / 100; 2142 2143 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS); 2144 new_serial.flags |= (info->asyncflags & ASYNC_FLAGS); 2145 2146 MoxaSetFifo(info, new_serial.type == PORT_16550A); 2147 2148 info->type = new_serial.type; 2149 return 0; 2150} 2151 2152 2153 2154/***************************************************************************** 2155 * Static local functions: * 2156 *****************************************************************************/ 2157 2158static void MoxaSetFifo(struct moxa_port *port, int enable) 2159{ 2160 void __iomem *ofsAddr = port->tableAddr; 2161 2162 if (!enable) { 2163 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0); 2164 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1); 2165 } else { 2166 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3); 2167 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16); 2168 } 2169} 2170