drivers/char/mxser_new.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com.tw).
   5  *
   6  *      This code is loosely based on the Linux serial driver, written by
   7  *      Linus Torvalds, Theodore T'so and others.
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  *      This program is distributed in the hope that it will be useful,
  15  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *      GNU General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License
  20  *      along with this program; if not, write to the Free Software
  21  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  24  *      <alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
  25  *      - Fixed x86_64 cleanness
  26  *      - Fixed sleep with spinlock held in mxser_send_break
  27  */
  28
  29
  30 #include <linux/module.h>
  31 #include <linux/autoconf.h>
  32 #include <linux/errno.h>
  33 #include <linux/signal.h>
  34 #include <linux/sched.h>
  35 #include <linux/timer.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/tty.h>
  38 #include <linux/tty_flip.h>
  39 #include <linux/serial.h>
  40 #include <linux/serial_reg.h>
  41 #include <linux/major.h>
  42 #include <linux/string.h>
  43 #include <linux/fcntl.h>
  44 #include <linux/ptrace.h>
  45 #include <linux/gfp.h>
  46 #include <linux/ioport.h>
  47 #include <linux/mm.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/delay.h>
  50 #include <linux/pci.h>
  51
  52 #include <asm/system.h>
  53 #include <asm/io.h>
  54 #include <asm/irq.h>
  55 #include <asm/bitops.h>
  56 #include <asm/uaccess.h>
  57
  58 #include "mxser_new.h"
  59
  60 #define MXSER_VERSION   "2.0"
  61 #define MXSERMAJOR       174
  62 #define MXSERCUMAJOR     175
  63
  64 #define MXSER_EVENT_TXLOW       1
  65 #define MXSER_EVENT_HANGUP      2
  66
  67 #define MXSER_BOARDS            4       /* Max. boards */
  68 #define MXSER_PORTS             32      /* Max. ports */
  69 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  70 #define MXSER_ISR_PASS_LIMIT    99999L
  71
  72 #define MXSER_ERR_IOADDR        -1
  73 #define MXSER_ERR_IRQ           -2
  74 #define MXSER_ERR_IRQ_CONFLIT   -3
  75 #define MXSER_ERR_VECTOR        -4
  76
  77 #define SERIAL_TYPE_NORMAL      1
  78 #define SERIAL_TYPE_CALLOUT     2
  79
  80 #define WAKEUP_CHARS            256
  81
  82 #define UART_MCR_AFE            0x20
  83 #define UART_LSR_SPECIAL        0x1E
  84
  85 #define RELEVANT_IFLAG(iflag)   (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|\
  86                                           IXON|IXOFF))
  87
  88 #define C168_ASIC_ID    1
  89 #define C104_ASIC_ID    2
  90 #define C102_ASIC_ID    0xB
  91 #define CI132_ASIC_ID   4
  92 #define CI134_ASIC_ID   3
  93 #define CI104J_ASIC_ID  5
  94
  95 enum {
  96         MXSER_BOARD_C168_ISA = 1,
  97         MXSER_BOARD_C104_ISA,
  98         MXSER_BOARD_CI104J,
  99         MXSER_BOARD_C168_PCI,
 100         MXSER_BOARD_C104_PCI,
 101         MXSER_BOARD_C102_ISA,
 102         MXSER_BOARD_CI132,
 103         MXSER_BOARD_CI134,
 104         MXSER_BOARD_CP132,
 105         MXSER_BOARD_CP114,
 106         MXSER_BOARD_CT114,
 107         MXSER_BOARD_CP102,
 108         MXSER_BOARD_CP104U,
 109         MXSER_BOARD_CP168U,
 110         MXSER_BOARD_CP132U,
 111         MXSER_BOARD_CP134U,
 112         MXSER_BOARD_CP104JU,
 113         MXSER_BOARD_RC7000,
 114         MXSER_BOARD_CP118U,
 115         MXSER_BOARD_CP102UL,
 116         MXSER_BOARD_CP102U,
 117         MXSER_BOARD_CP118EL,
 118         MXSER_BOARD_CP168EL,
 119         MXSER_BOARD_CP104EL
 120 };
 121
 122 static char *mxser_brdname[] = {
 123         "C168 series",
 124         "C104 series",
 125         "CI-104J series",
 126         "C168H/PCI series",
 127         "C104H/PCI series",
 128         "C102 series",
 129         "CI-132 series",
 130         "CI-134 series",
 131         "CP-132 series",
 132         "CP-114 series",
 133         "CT-114 series",
 134         "CP-102 series",
 135         "CP-104U series",
 136         "CP-168U series",
 137         "CP-132U series",
 138         "CP-134U series",
 139         "CP-104JU series",
 140         "Moxa UC7000 Serial",
 141         "CP-118U series",
 142         "CP-102UL series",
 143         "CP-102U series",
 144         "CP-118EL series",
 145         "CP-168EL series",
 146         "CP-104EL series"
 147 };
 148
 149 static int mxser_numports[] = {
 150         8,                      /* C168-ISA */
 151         4,                      /* C104-ISA */
 152         4,                      /* CI104J */
 153         8,                      /* C168-PCI */
 154         4,                      /* C104-PCI */
 155         2,                      /* C102-ISA */
 156         2,                      /* CI132 */
 157         4,                      /* CI134 */
 158         2,                      /* CP132 */
 159         4,                      /* CP114 */
 160         4,                      /* CT114 */
 161         2,                      /* CP102 */
 162         4,                      /* CP104U */
 163         8,                      /* CP168U */
 164         2,                      /* CP132U */
 165         4,                      /* CP134U */
 166         4,                      /* CP104JU */
 167         8,                      /* RC7000 */
 168         8,                      /* CP118U */
 169         2,                      /* CP102UL */
 170         2,                      /* CP102U */
 171         8,                      /* CP118EL */
 172         8,                      /* CP168EL */
 173         4                       /* CP104EL */
 174 };
 175
 176 #define UART_TYPE_NUM   2
 177
 178 static const unsigned int Gmoxa_uart_id[UART_TYPE_NUM] = {
 179         MOXA_MUST_MU150_HWID,
 180         MOXA_MUST_MU860_HWID
 181 };
 182
 183 /* This is only for PCI */
 184 #define UART_INFO_NUM   3
 185 struct mxpciuart_info {
 186         int type;
 187         int tx_fifo;
 188         int rx_fifo;
 189         int xmit_fifo_size;
 190         int rx_high_water;
 191         int rx_trigger;
 192         int rx_low_water;
 193         long max_baud;
 194 };
 195
 196 static const struct mxpciuart_info Gpci_uart_info[UART_INFO_NUM] = {
 197         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 198         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 199         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 200 };
 201
 202
 203 static struct pci_device_id mxser_pcibrds[] = {
 204         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C168),
 205                 .driver_data = MXSER_BOARD_C168_PCI },
 206         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C104),
 207                 .driver_data = MXSER_BOARD_C104_PCI },
 208         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132),
 209                 .driver_data = MXSER_BOARD_CP132 },
 210         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP114),
 211                 .driver_data = MXSER_BOARD_CP114 },
 212         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CT114),
 213                 .driver_data = MXSER_BOARD_CT114 },
 214         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102),
 215                 .driver_data = MXSER_BOARD_CP102 },
 216         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104U),
 217                 .driver_data = MXSER_BOARD_CP104U },
 218         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168U),
 219                 .driver_data = MXSER_BOARD_CP168U },
 220         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132U),
 221                 .driver_data = MXSER_BOARD_CP132U },
 222         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP134U),
 223                 .driver_data = MXSER_BOARD_CP134U },
 224         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104JU),
 225                 .driver_data = MXSER_BOARD_CP104JU },
 226         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_RC7000),
 227                 .driver_data = MXSER_BOARD_RC7000 },
 228         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118U),
 229                 .driver_data = MXSER_BOARD_CP118U },
 230         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102UL),
 231                 .driver_data = MXSER_BOARD_CP102UL },
 232         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102U),
 233                 .driver_data = MXSER_BOARD_CP102U },
 234         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118EL),
 235                 .driver_data = MXSER_BOARD_CP118EL },
 236         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168EL),
 237                 .driver_data = MXSER_BOARD_CP168EL },
 238         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104EL),
 239                 .driver_data = MXSER_BOARD_CP104EL },
 240         { }
 241 };
 242 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 243
 244 static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 245 static int ttymajor = MXSERMAJOR;
 246 static int calloutmajor = MXSERCUMAJOR;
 247 static int verbose = 0;
 248
 249 /* Variables for insmod */
 250
 251 MODULE_AUTHOR("Casper Yang");
 252 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 253 module_param_array(ioaddr, int, NULL, 0);
 254 module_param(ttymajor, int, 0);
 255 module_param(verbose, bool, 0);
 256 MODULE_LICENSE("GPL");
 257
 258 struct mxser_log {
 259         int tick;
 260         unsigned long rxcnt[MXSER_PORTS];
 261         unsigned long txcnt[MXSER_PORTS];
 262 };
 263
 264
 265 struct mxser_mon {
 266         unsigned long rxcnt;
 267         unsigned long txcnt;
 268         unsigned long up_rxcnt;
 269         unsigned long up_txcnt;
 270         int modem_status;
 271         unsigned char hold_reason;
 272 };
 273
 274 struct mxser_mon_ext {
 275         unsigned long rx_cnt[32];
 276         unsigned long tx_cnt[32];
 277         unsigned long up_rxcnt[32];
 278         unsigned long up_txcnt[32];
 279         int modem_status[32];
 280
 281         long baudrate[32];
 282         int databits[32];
 283         int stopbits[32];
 284         int parity[32];
 285         int flowctrl[32];
 286         int fifo[32];
 287         int iftype[32];
 288 };
 289
 290 struct mxser_board;
 291
 292 struct mxser_port {
 293         struct mxser_board *board;
 294         struct tty_struct *tty;
 295
 296         unsigned long ioaddr;
 297         unsigned long opmode_ioaddr;
 298         int max_baud;
 299
 300         int rx_high_water;
 301         int rx_trigger;         /* Rx fifo trigger level */
 302         int rx_low_water;
 303         int baud_base;          /* max. speed */
 304         long realbaud;
 305         int type;               /* UART type */
 306         int flags;              /* defined in tty.h */
 307         long session;           /* Session of opening process */
 308         long pgrp;              /* pgrp of opening process */
 309
 310         int x_char;             /* xon/xoff character */
 311         int IER;                /* Interrupt Enable Register */
 312         int MCR;                /* Modem control register */
 313
 314         unsigned char stop_rx;
 315         unsigned char ldisc_stop_rx;
 316
 317         int custom_divisor;
 318         int close_delay;
 319         unsigned short closing_wait;
 320         unsigned char err_shadow;
 321         unsigned long event;
 322
 323         int count;              /* # of fd on device */
 324         int blocked_open;       /* # of blocked opens */
 325         struct async_icount icount; /* kernel counters for 4 input interrupts */
 326         int timeout;
 327
 328         int read_status_mask;
 329         int ignore_status_mask;
 330         int xmit_fifo_size;
 331         unsigned char *xmit_buf;
 332         int xmit_head;
 333         int xmit_tail;
 334         int xmit_cnt;
 335
 336         struct termios normal_termios;
 337         struct termios callout_termios;
 338
 339         struct mxser_mon mon_data;
 340
 341         spinlock_t slock;
 342         struct work_struct tqueue;
 343         wait_queue_head_t open_wait;
 344         wait_queue_head_t close_wait;
 345         wait_queue_head_t delta_msr_wait;
 346 };
 347
 348 struct mxser_board {
 349         struct pci_dev *pdev; /* temporary (until pci probing) */
 350
 351         int irq;
 352         int board_type;
 353         unsigned int nports;
 354         unsigned long vector;
 355         unsigned long vector_mask;
 356
 357         int chip_flag;
 358         int uart_type;
 359
 360         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 361 };
 362
 363 struct mxser_mstatus {
 364         tcflag_t cflag;
 365         int cts;
 366         int dsr;
 367         int ri;
 368         int dcd;
 369 };
 370
 371 static struct mxser_mstatus GMStatus[MXSER_PORTS];
 372
 373 static int mxserBoardCAP[MXSER_BOARDS] = {
 374         0, 0, 0, 0
 375         /*  0x180, 0x280, 0x200, 0x320 */
 376 };
 377
 378 static struct mxser_board mxser_boards[MXSER_BOARDS];
 379 static struct tty_driver *mxvar_sdriver;
 380 static struct tty_struct *mxvar_tty[MXSER_PORTS + 1];
 381 static struct termios *mxvar_termios[MXSER_PORTS + 1];
 382 static struct termios *mxvar_termios_locked[MXSER_PORTS + 1];
 383 static struct mxser_log mxvar_log;
 384 static int mxvar_diagflag;
 385 static unsigned char mxser_msr[MXSER_PORTS + 1];
 386 static struct mxser_mon_ext mon_data_ext;
 387 static int mxser_set_baud_method[MXSER_PORTS + 1];
 388 static spinlock_t gm_lock;
 389
 390 /*
 391  * static functions:
 392  */
 393
 394 static int mxser_init(void);
 395
 396 /* static void   mxser_poll(unsigned long); */
 397 static int mxser_get_ISA_conf(int, struct mxser_board *);
 398 static void mxser_do_softint(void *);
 399 static int mxser_open(struct tty_struct *, struct file *);
 400 static void mxser_close(struct tty_struct *, struct file *);
 401 static int mxser_write(struct tty_struct *, const unsigned char *, int);
 402 static int mxser_write_room(struct tty_struct *);
 403 static void mxser_flush_buffer(struct tty_struct *);
 404 static int mxser_chars_in_buffer(struct tty_struct *);
 405 static void mxser_flush_chars(struct tty_struct *);
 406 static void mxser_put_char(struct tty_struct *, unsigned char);
 407 static int mxser_ioctl(struct tty_struct *, struct file *, uint, ulong);
 408 static int mxser_ioctl_special(unsigned int, void __user *);
 409 static void mxser_throttle(struct tty_struct *);
 410 static void mxser_unthrottle(struct tty_struct *);
 411 static void mxser_set_termios(struct tty_struct *, struct termios *);
 412 static void mxser_stop(struct tty_struct *);
 413 static void mxser_start(struct tty_struct *);
 414 static void mxser_hangup(struct tty_struct *);
 415 static void mxser_rs_break(struct tty_struct *, int);
 416 static irqreturn_t mxser_interrupt(int, void *, struct pt_regs *);
 417 static void mxser_receive_chars(struct mxser_port *, int *);
 418 static void mxser_transmit_chars(struct mxser_port *);
 419 static void mxser_check_modem_status(struct mxser_port *, int);
 420 static int mxser_block_til_ready(struct tty_struct *, struct file *,
 421                 struct mxser_port *);
 422 static int mxser_startup(struct mxser_port *);
 423 static void mxser_shutdown(struct mxser_port *);
 424 static int mxser_change_speed(struct mxser_port *, struct termios *);
 425 static int mxser_get_serial_info(struct mxser_port *,
 426                 struct serial_struct __user *);
 427 static int mxser_set_serial_info(struct mxser_port *,
 428                 struct serial_struct __user *);
 429 static int mxser_get_lsr_info(struct mxser_port *, unsigned int __user *);
 430 static void mxser_send_break(struct mxser_port *, int);
 431 static int mxser_tiocmget(struct tty_struct *, struct file *);
 432 static int mxser_tiocmset(struct tty_struct *, struct file *, unsigned int,
 433                 unsigned int);
 434 static int mxser_set_baud(struct mxser_port *, long);
 435 static void mxser_wait_until_sent(struct tty_struct *, int);
 436
 437 static void mxser_startrx(struct tty_struct *);
 438 static void mxser_stoprx(struct tty_struct *);
 439
 440
 441 static int CheckIsMoxaMust(int io)
 442 {
 443         u8 oldmcr, hwid;
 444         int i;
 445
 446         outb(0, io + UART_LCR);
 447         DISABLE_MOXA_MUST_ENCHANCE_MODE(io);
 448         oldmcr = inb(io + UART_MCR);
 449         outb(0, io + UART_MCR);
 450         SET_MOXA_MUST_XON1_VALUE(io, 0x11);
 451         if ((hwid = inb(io + UART_MCR)) != 0) {
 452                 outb(oldmcr, io + UART_MCR);
 453                 return MOXA_OTHER_UART;
 454         }
 455
 456         GET_MOXA_MUST_HARDWARE_ID(io, &hwid);
 457         for (i = 0; i < UART_TYPE_NUM; i++) {
 458                 if (hwid == Gmoxa_uart_id[i])
 459                         return (int)hwid;
 460         }
 461         return MOXA_OTHER_UART;
 462 }
 463
 464 /* above is modified by Victor Yu. 08-15-2002 */
 465
 466 static const struct tty_operations mxser_ops = {
 467         .open = mxser_open,
 468         .close = mxser_close,
 469         .write = mxser_write,
 470         .put_char = mxser_put_char,
 471         .flush_chars = mxser_flush_chars,
 472         .write_room = mxser_write_room,
 473         .chars_in_buffer = mxser_chars_in_buffer,
 474         .flush_buffer = mxser_flush_buffer,
 475         .ioctl = mxser_ioctl,
 476         .throttle = mxser_throttle,
 477         .unthrottle = mxser_unthrottle,
 478         .set_termios = mxser_set_termios,
 479         .stop = mxser_stop,
 480         .start = mxser_start,
 481         .hangup = mxser_hangup,
 482         .break_ctl = mxser_rs_break,
 483         .wait_until_sent = mxser_wait_until_sent,
 484         .tiocmget = mxser_tiocmget,
 485         .tiocmset = mxser_tiocmset,
 486 };
 487
 488 /*
 489  * The MOXA Smartio/Industio serial driver boot-time initialization code!
 490  */
 491
 492 static int __init mxser_module_init(void)
 493 {
 494         int ret;
 495
 496         if (verbose)
 497                 printk(KERN_DEBUG "Loading module mxser ...\n");
 498         printk(KERN_INFO "This is mxser driver version 1.9.1 and needs TESTING."
 499                 "If your are willing to test this driver, please report to "
 500                 "jirislaby@gmail.com. Thanks.\n");
 501         ret = mxser_init();
 502         if (verbose)
 503                 printk(KERN_DEBUG "Done.\n");
 504         return ret;
 505 }
 506
 507 static void __exit mxser_module_exit(void)
 508 {
 509         int i, err;
 510
 511         if (verbose)
 512                 printk(KERN_DEBUG "Unloading module mxser ...\n");
 513
 514         err = tty_unregister_driver(mxvar_sdriver);
 515         if (!err)
 516                 put_tty_driver(mxvar_sdriver);
 517         else
 518                 printk(KERN_ERR "Couldn't unregister MOXA Smartio/Industio family serial driver\n");
 519
 520         for (i = 0; i < MXSER_BOARDS; i++) {
 521                 struct pci_dev *pdev;
 522
 523                 if (mxser_boards[i].board_type == -1)
 524                         continue;
 525                 else {
 526                         pdev = mxser_boards[i].pdev;
 527                         free_irq(mxser_boards[i].irq, &mxser_boards[i]);
 528                         if (pdev != NULL) {     /* PCI */
 529                                 pci_release_region(pdev, 2);
 530                                 pci_release_region(pdev, 3);
 531                                 pci_dev_put(pdev);
 532                         } else {
 533                                 release_region(mxser_boards[i].ports[0].ioaddr, 8 * mxser_boards[i].nports);
 534                                 release_region(mxser_boards[i].vector, 1);
 535                         }
 536                 }
 537         }
 538         if (verbose)
 539                 printk(KERN_DEBUG "Done.\n");
 540 }
 541
 542 static void process_txrx_fifo(struct mxser_port *info)
 543 {
 544         int i;
 545
 546         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 547                 info->rx_trigger = 1;
 548                 info->rx_high_water = 1;
 549                 info->rx_low_water = 1;
 550                 info->xmit_fifo_size = 1;
 551         } else
 552                 for (i = 0; i < UART_INFO_NUM; i++)
 553                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 554                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 555                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 556                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 557                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 558                                 break;
 559                         }
 560 }
 561
 562 static int __devinit mxser_initbrd(struct mxser_board *brd)
 563 {
 564         struct mxser_port *info;
 565         unsigned int i;
 566         int retval;
 567
 568         /*if (verbose) */  {
 569                 printk(" max. baud rate = %d bps.\n",
 570                         brd->ports[0].max_baud);
 571         }
 572
 573         for (i = 0; i < brd->nports; i++) {
 574                 info = &brd->ports[i];
 575                 info->board = brd;
 576                 info->stop_rx = 0;
 577                 info->ldisc_stop_rx = 0;
 578
 579                 /* Enhance mode enabled here */
 580                 if (brd->chip_flag != MOXA_OTHER_UART)
 581                         ENABLE_MOXA_MUST_ENCHANCE_MODE(info->ioaddr);
 582
 583                 info->flags = ASYNC_SHARE_IRQ;
 584                 info->type = brd->uart_type;
 585
 586                 process_txrx_fifo(info);
 587
 588                 info->custom_divisor = info->baud_base * 16;
 589                 info->close_delay = 5 * HZ / 10;
 590                 info->closing_wait = 30 * HZ;
 591                 INIT_WORK(&info->tqueue, mxser_do_softint, info);
 592                 info->normal_termios = mxvar_sdriver->init_termios;
 593                 init_waitqueue_head(&info->open_wait);
 594                 init_waitqueue_head(&info->close_wait);
 595                 init_waitqueue_head(&info->delta_msr_wait);
 596                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
 597                 info->err_shadow = 0;
 598                 spin_lock_init(&info->slock);
 599
 600                 /* before set INT ISR, disable all int */
 601                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
 602                         info->ioaddr + UART_IER);
 603         }
 604         /*
 605          * Allocate the IRQ if necessary
 606          */
 607
 608         retval = request_irq(brd->irq, mxser_interrupt,
 609                         (brd->ports[0].flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED :
 610                         IRQF_DISABLED, "mxser", brd);
 611         if (retval) {
 612                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
 613                         "conflict with another device.\n",
 614                         mxser_brdname[brd->board_type - 1], brd->irq);
 615                 return retval;
 616         }
 617         return 0;
 618 }
 619
 620 static int __init mxser_get_PCI_conf(int board_type, struct mxser_board *brd,
 621                 struct pci_dev *pdev)
 622 {
 623         unsigned int i, j;
 624         unsigned long ioaddress;
 625         int retval;
 626
 627         /* io address */
 628         brd->board_type = board_type;
 629         brd->nports = mxser_numports[board_type - 1];
 630         ioaddress = pci_resource_start(pdev, 2);
 631         retval = pci_request_region(pdev, 2, "mxser(IO)");
 632         if (retval)
 633                 goto err;
 634
 635         for (i = 0; i < brd->nports; i++)
 636                 brd->ports[i].ioaddr = ioaddress + 8 * i;
 637
 638         /* vector */
 639         ioaddress = pci_resource_start(pdev, 3);
 640         retval = pci_request_region(pdev, 3, "mxser(vector)");
 641         if (retval)
 642                 goto err_relio;
 643         brd->vector = ioaddress;
 644
 645         /* irq */
 646         brd->irq = pdev->irq;
 647
 648         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
 649         brd->uart_type = PORT_16550A;
 650         brd->vector_mask = 0;
 651
 652         for (i = 0; i < brd->nports; i++) {
 653                 for (j = 0; j < UART_INFO_NUM; j++) {
 654                         if (Gpci_uart_info[j].type == brd->chip_flag) {
 655                                 brd->ports[i].max_baud =
 656                                         Gpci_uart_info[j].max_baud;
 657
 658                                 /* exception....CP-102 */
 659                                 if (board_type == MXSER_BOARD_CP102)
 660                                         brd->ports[i].max_baud = 921600;
 661                                 break;
 662                         }
 663                 }
 664         }
 665
 666         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
 667                 for (i = 0; i < brd->nports; i++) {
 668                         if (i < 4)
 669                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
 670                         else
 671                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
 672                 }
 673                 outb(0, ioaddress + 4); /* default set to RS232 mode */
 674                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
 675         }
 676
 677         for (i = 0; i < brd->nports; i++) {
 678                 brd->vector_mask |= (1 << i);
 679                 brd->ports[i].baud_base = 921600;
 680         }
 681         return 0;
 682 err_relio:
 683         pci_release_region(pdev, 2);
 684 err:
 685         return retval;
 686 }
 687
 688 static int __init mxser_init(void)
 689 {
 690         struct pci_dev *pdev = NULL;
 691         struct mxser_board *brd;
 692         unsigned int i, m;
 693         int retval, b, n;
 694
 695         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
 696         if (!mxvar_sdriver)
 697                 return -ENOMEM;
 698         spin_lock_init(&gm_lock);
 699
 700         for (i = 0; i < MXSER_BOARDS; i++)
 701                 mxser_boards[i].board_type = -1;
 702
 703         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
 704                 MXSER_VERSION);
 705
 706         /* Initialize the tty_driver structure */
 707         memset(mxvar_sdriver, 0, sizeof(struct tty_driver));
 708         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
 709         mxvar_sdriver->name = "ttyM";
 710         mxvar_sdriver->major = ttymajor;
 711         mxvar_sdriver->minor_start = 0;
 712         mxvar_sdriver->num = MXSER_PORTS + 1;
 713         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
 714         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
 715         mxvar_sdriver->init_termios = tty_std_termios;
 716         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
 717         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW;
 718         tty_set_operations(mxvar_sdriver, &mxser_ops);
 719         mxvar_sdriver->ttys = mxvar_tty;
 720         mxvar_sdriver->termios = mxvar_termios;
 721         mxvar_sdriver->termios_locked = mxvar_termios_locked;
 722
 723         mxvar_diagflag = 0;
 724         memset(mxser_boards, 0, sizeof(mxser_boards));
 725         memset(&mxvar_log, 0, sizeof(struct mxser_log));
 726
 727         memset(&mxser_msr, 0, sizeof(unsigned char) * (MXSER_PORTS + 1));
 728         memset(&mon_data_ext, 0, sizeof(struct mxser_mon_ext));
 729         memset(&mxser_set_baud_method, 0, sizeof(int) * (MXSER_PORTS + 1));
 730
 731         m = 0;
 732         /* Start finding ISA boards here */
 733         for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
 734                 int cap;
 735
 736                 if (!(cap = mxserBoardCAP[b]))
 737                         continue;
 738
 739                 brd = &mxser_boards[m];
 740                 retval = mxser_get_ISA_conf(cap, brd);
 741
 742                 if (retval != 0)
 743                         printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n",
 744                                 mxser_brdname[brd->board_type - 1], ioaddr[b]);
 745
 746                 if (retval <= 0) {
 747                         if (retval == MXSER_ERR_IRQ)
 748                                 printk(KERN_ERR "Invalid interrupt number, "
 749                                         "board not configured\n");
 750                         else if (retval == MXSER_ERR_IRQ_CONFLIT)
 751                                 printk(KERN_ERR "Invalid interrupt number, "
 752                                         "board not configured\n");
 753                         else if (retval == MXSER_ERR_VECTOR)
 754                                 printk(KERN_ERR "Invalid interrupt vector, "
 755                                         "board not configured\n");
 756                         else if (retval == MXSER_ERR_IOADDR)
 757                                 printk(KERN_ERR "Invalid I/O address, "
 758                                         "board not configured\n");
 759
 760                         continue;
 761                 }
 762
 763                 brd->pdev = NULL;
 764
 765                 /* mxser_initbrd will hook ISR. */
 766                 if (mxser_initbrd(brd) < 0)
 767                         continue;
 768
 769                 m++;
 770         }
 771
 772         /* Start finding ISA boards from module arg */
 773         for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
 774                 unsigned long cap;
 775
 776                 if (!(cap = ioaddr[b]))
 777                         continue;
 778
 779                 brd = &mxser_boards[m];
 780                 retval = mxser_get_ISA_conf(cap, &mxser_boards[m]);
 781
 782                 if (retval != 0)
 783                         printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n",
 784                                 mxser_brdname[brd->board_type - 1], ioaddr[b]);
 785
 786                 if (retval <= 0) {
 787                         if (retval == MXSER_ERR_IRQ)
 788                                 printk(KERN_ERR "Invalid interrupt number, "
 789                                         "board not configured\n");
 790                         else if (retval == MXSER_ERR_IRQ_CONFLIT)
 791                                 printk(KERN_ERR "Invalid interrupt number, "
 792                                         "board not configured\n");
 793                         else if (retval == MXSER_ERR_VECTOR)
 794                                 printk(KERN_ERR "Invalid interrupt vector, "
 795                                         "board not configured\n");
 796                         else if (retval == MXSER_ERR_IOADDR)
 797                                 printk(KERN_ERR "Invalid I/O address, "
 798                                         "board not configured\n");
 799
 800                         continue;
 801                 }
 802
 803                 brd->pdev = NULL;
 804                 /* mxser_initbrd will hook ISR. */
 805                 if (mxser_initbrd(brd) < 0)
 806                         continue;
 807
 808                 m++;
 809         }
 810
 811         /* start finding PCI board here */
 812         n = ARRAY_SIZE(mxser_pcibrds) - 1;
 813         b = 0;
 814         while (b < n) {
 815                 pdev = pci_get_device(mxser_pcibrds[b].vendor,
 816                                 mxser_pcibrds[b].device, pdev);
 817                 if (pdev == NULL) {
 818                         b++;
 819                         continue;
 820                 }
 821                 printk(KERN_INFO "Found MOXA %s board(BusNo=%d,DevNo=%d)\n",
 822                         mxser_brdname[(int) (mxser_pcibrds[b].driver_data) - 1],
 823                         pdev->bus->number, PCI_SLOT(pdev->devfn));
 824                 if (m >= MXSER_BOARDS)
 825                         printk(KERN_ERR
 826                                 "Too many Smartio/Industio family boards find "
 827                                 "(maximum %d), board not configured\n",
 828                                 MXSER_BOARDS);
 829                 else {
 830                         if (pci_enable_device(pdev)) {
 831                                 printk(KERN_ERR "Moxa SmartI/O PCI enable "
 832                                         "fail !\n");
 833                                 continue;
 834                         }
 835                         brd = &mxser_boards[m];
 836                         brd->pdev = pdev;
 837                         retval = mxser_get_PCI_conf(
 838                                         (int)mxser_pcibrds[b].driver_data,
 839                                         brd, pdev);
 840                         if (retval < 0) {
 841                                 if (retval == MXSER_ERR_IRQ)
 842                                         printk(KERN_ERR
 843                                                 "Invalid interrupt number, "
 844                                                 "board not configured\n");
 845                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
 846                                         printk(KERN_ERR
 847                                                 "Invalid interrupt number, "
 848                                                 "board not configured\n");
 849                                 else if (retval == MXSER_ERR_VECTOR)
 850                                         printk(KERN_ERR
 851                                                 "Invalid interrupt vector, "
 852                                                 "board not configured\n");
 853                                 else if (retval == MXSER_ERR_IOADDR)
 854                                         printk(KERN_ERR
 855                                                 "Invalid I/O address, "
 856                                                 "board not configured\n");
 857                                 continue;
 858                         }
 859                         /* mxser_initbrd will hook ISR. */
 860                         if (mxser_initbrd(brd) < 0)
 861                                 continue;
 862                         m++;
 863                         /* Keep an extra reference if we succeeded. It will
 864                            be returned at unload time */
 865                         pci_dev_get(pdev);
 866                 }
 867         }
 868
 869         retval = tty_register_driver(mxvar_sdriver);
 870         if (retval) {
 871                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family"
 872                                 " driver !\n");
 873                 put_tty_driver(mxvar_sdriver);
 874
 875                 for (i = 0; i < MXSER_BOARDS; i++) {
 876                         if (mxser_boards[i].board_type == -1)
 877                                 continue;
 878                         else {
 879                                 free_irq(mxser_boards[i].irq, &mxser_boards[i]);
 880                                 /* todo: release io, vector */
 881                         }
 882                 }
 883                 return retval;
 884         }
 885
 886         return 0;
 887 }
 888
 889 static void mxser_do_softint(void *private_)
 890 {
 891         struct mxser_port *info = private_;
 892         struct tty_struct *tty;
 893
 894         tty = info->tty;
 895
 896         if (test_and_clear_bit(MXSER_EVENT_TXLOW, &info->event))
 897                 tty_wakeup(tty);
 898         if (test_and_clear_bit(MXSER_EVENT_HANGUP, &info->event))
 899                 tty_hangup(tty);
 900 }
 901
 902 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 903 {
 904         unsigned char status = 0;
 905
 906         status = inb(baseaddr + UART_MSR);
 907
 908         mxser_msr[port] &= 0x0F;
 909         mxser_msr[port] |= status;
 910         status = mxser_msr[port];
 911         if (mode)
 912                 mxser_msr[port] = 0;
 913
 914         return status;
 915 }
 916
 917 /*
 918  * This routine is called whenever a serial port is opened.  It
 919  * enables interrupts for a serial port, linking in its async structure into
 920  * the IRQ chain.   It also performs the serial-specific
 921  * initialization for the tty structure.
 922  */
 923 static int mxser_open(struct tty_struct *tty, struct file *filp)
 924 {
 925         struct mxser_port *info;
 926         int retval, line;
 927
 928         /* initialize driver_data in case something fails */
 929         tty->driver_data = NULL;
 930
 931         line = tty->index;
 932         if (line == MXSER_PORTS)
 933                 return 0;
 934         if (line < 0 || line > MXSER_PORTS)
 935                 return -ENODEV;
 936         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
 937         if (!info->ioaddr)
 938                 return -ENODEV;
 939
 940         tty->driver_data = info;
 941         info->tty = tty;
 942         /*
 943          * Start up serial port
 944          */
 945         info->count++;
 946         retval = mxser_startup(info);
 947         if (retval)
 948                 return retval;
 949
 950         retval = mxser_block_til_ready(tty, filp, info);
 951         if (retval)
 952                 return retval;
 953
 954         if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
 955                 if (tty->driver->subtype == SERIAL_TYPE_NORMAL)
 956                         *tty->termios = info->normal_termios;
 957                 else
 958                         *tty->termios = info->callout_termios;
 959                 mxser_change_speed(info, NULL);
 960         }
 961
 962         info->session = process_session(current);
 963         info->pgrp = process_group(current);
 964
 965         /*
 966         status = mxser_get_msr(info->base, 0, info->port);
 967         mxser_check_modem_status(info, status);
 968         */
 969
 970 /* unmark here for very high baud rate (ex. 921600 bps) used */
 971         tty->low_latency = 1;
 972         return 0;
 973 }
 974
 975 /*
 976  * This routine is called when the serial port gets closed.  First, we
 977  * wait for the last remaining data to be sent.  Then, we unlink its
 978  * async structure from the interrupt chain if necessary, and we free
 979  * that IRQ if nothing is left in the chain.
 980  */
 981 static void mxser_close(struct tty_struct *tty, struct file *filp)
 982 {
 983         struct mxser_port *info = tty->driver_data;
 984
 985         unsigned long timeout;
 986         unsigned long flags;
 987         struct tty_ldisc *ld;
 988
 989         if (tty->index == MXSER_PORTS)
 990                 return;
 991         if (!info)
 992                 return;
 993
 994         spin_lock_irqsave(&info->slock, flags);
 995
 996         if (tty_hung_up_p(filp)) {
 997                 spin_unlock_irqrestore(&info->slock, flags);
 998                 return;
 999         }
1000         if ((tty->count == 1) && (info->count != 1)) {
1001                 /*
1002                  * Uh, oh.  tty->count is 1, which means that the tty
1003                  * structure will be freed.  Info->count should always
1004                  * be one in these conditions.  If it's greater than
1005                  * one, we've got real problems, since it means the
1006                  * serial port won't be shutdown.
1007                  */
1008                 printk(KERN_ERR "mxser_close: bad serial port count; "
1009                         "tty->count is 1, info->count is %d\n", info->count);
1010                 info->count = 1;
1011         }
1012         if (--info->count < 0) {
1013                 printk(KERN_ERR "mxser_close: bad serial port count for "
1014                         "ttys%d: %d\n", tty->index, info->count);
1015                 info->count = 0;
1016         }
1017         if (info->count) {
1018                 spin_unlock_irqrestore(&info->slock, flags);
1019                 return;
1020         }
1021         info->flags |= ASYNC_CLOSING;
1022         spin_unlock_irqrestore(&info->slock, flags);
1023         /*
1024          * Save the termios structure, since this port may have
1025          * separate termios for callout and dialin.
1026          */
1027         if (info->flags & ASYNC_NORMAL_ACTIVE)
1028                 info->normal_termios = *tty->termios;
1029         /*
1030          * Now we wait for the transmit buffer to clear; and we notify
1031          * the line discipline to only process XON/XOFF characters.
1032          */
1033         tty->closing = 1;
1034         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1035                 tty_wait_until_sent(tty, info->closing_wait);
1036         /*
1037          * At this point we stop accepting input.  To do this, we
1038          * disable the receive line status interrupts, and tell the
1039          * interrupt driver to stop checking the data ready bit in the
1040          * line status register.
1041          */
1042         info->IER &= ~UART_IER_RLSI;
1043         if (info->board->chip_flag)
1044                 info->IER &= ~MOXA_MUST_RECV_ISR;
1045 /* by William
1046         info->read_status_mask &= ~UART_LSR_DR;
1047 */
1048         if (info->flags & ASYNC_INITIALIZED) {
1049                 outb(info->IER, info->ioaddr + UART_IER);
1050                 /*
1051                  * Before we drop DTR, make sure the UART transmitter
1052                  * has completely drained; this is especially
1053                  * important if there is a transmit FIFO!
1054                  */
1055                 timeout = jiffies + HZ;
1056                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1057                         schedule_timeout_interruptible(5);
1058                         if (time_after(jiffies, timeout))
1059                                 break;
1060                 }
1061         }
1062         mxser_shutdown(info);
1063
1064         if (tty->driver->flush_buffer)
1065                 tty->driver->flush_buffer(tty);
1066
1067         ld = tty_ldisc_ref(tty);
1068         if (ld) {
1069                 if (ld->flush_buffer)
1070                         ld->flush_buffer(tty);
1071                 tty_ldisc_deref(ld);
1072         }
1073
1074         tty->closing = 0;
1075         info->event = 0;
1076         info->tty = NULL;
1077         if (info->blocked_open) {
1078                 if (info->close_delay)
1079                         schedule_timeout_interruptible(info->close_delay);
1080                 wake_up_interruptible(&info->open_wait);
1081         }
1082
1083         info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1084         wake_up_interruptible(&info->close_wait);
1085
1086 }
1087
1088 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1089 {
1090         int c, total = 0;
1091         struct mxser_port *info = tty->driver_data;
1092         unsigned long flags;
1093
1094         if (!info->xmit_buf)
1095                 return 0;
1096
1097         while (1) {
1098                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1099                                           SERIAL_XMIT_SIZE - info->xmit_head));
1100                 if (c <= 0)
1101                         break;
1102
1103                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1104                 spin_lock_irqsave(&info->slock, flags);
1105                 info->xmit_head = (info->xmit_head + c) &
1106                                   (SERIAL_XMIT_SIZE - 1);
1107                 info->xmit_cnt += c;
1108                 spin_unlock_irqrestore(&info->slock, flags);
1109
1110                 buf += c;
1111                 count -= c;
1112                 total += c;
1113         }
1114
1115         if (info->xmit_cnt && !tty->stopped
1116                         /*&& !(info->IER & UART_IER_THRI)*/) {
1117                 if (!tty->hw_stopped ||
1118                                 (info->type == PORT_16550A) ||
1119                                 (info->board->chip_flag)) {
1120                         spin_lock_irqsave(&info->slock, flags);
1121                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1122                                         UART_IER);
1123                         info->IER |= UART_IER_THRI;
1124                         outb(info->IER, info->ioaddr + UART_IER);
1125                         spin_unlock_irqrestore(&info->slock, flags);
1126                 }
1127         }
1128         return total;
1129 }
1130
1131 static void mxser_put_char(struct tty_struct *tty, unsigned char ch)
1132 {
1133         struct mxser_port *info = tty->driver_data;
1134         unsigned long flags;
1135
1136         if (!info->xmit_buf)
1137                 return;
1138
1139         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1140                 return;
1141
1142         spin_lock_irqsave(&info->slock, flags);
1143         info->xmit_buf[info->xmit_head++] = ch;
1144         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1145         info->xmit_cnt++;
1146         spin_unlock_irqrestore(&info->slock, flags);
1147         if (!tty->stopped /*&& !(info->IER & UART_IER_THRI)*/) {
1148                 if (!tty->hw_stopped ||
1149                                 (info->type == PORT_16550A) ||
1150                                 info->board->chip_flag) {
1151                         spin_lock_irqsave(&info->slock, flags);
1152                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1153                         info->IER |= UART_IER_THRI;
1154                         outb(info->IER, info->ioaddr + UART_IER);
1155                         spin_unlock_irqrestore(&info->slock, flags);
1156                 }
1157         }
1158 }
1159
1160
1161 static void mxser_flush_chars(struct tty_struct *tty)
1162 {
1163         struct mxser_port *info = tty->driver_data;
1164         unsigned long flags;
1165
1166         if (info->xmit_cnt <= 0 ||
1167                         tty->stopped ||
1168                         !info->xmit_buf ||
1169                         (tty->hw_stopped &&
1170                          (info->type != PORT_16550A) &&
1171                          (!info->board->chip_flag)
1172                         ))
1173                 return;
1174
1175         spin_lock_irqsave(&info->slock, flags);
1176
1177         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1178         info->IER |= UART_IER_THRI;
1179         outb(info->IER, info->ioaddr + UART_IER);
1180
1181         spin_unlock_irqrestore(&info->slock, flags);
1182 }
1183
1184 static int mxser_write_room(struct tty_struct *tty)
1185 {
1186         struct mxser_port *info = tty->driver_data;
1187         int ret;
1188
1189         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1190         if (ret < 0)
1191                 ret = 0;
1192         return ret;
1193 }
1194
1195 static int mxser_chars_in_buffer(struct tty_struct *tty)
1196 {
1197         struct mxser_port *info = tty->driver_data;
1198         int len = info->xmit_cnt;
1199
1200         if (!(inb(info->ioaddr + UART_LSR) & UART_LSR_THRE))
1201                 len++;
1202
1203         return len;
1204 }
1205
1206 static void mxser_flush_buffer(struct tty_struct *tty)
1207 {
1208         struct mxser_port *info = tty->driver_data;
1209         char fcr;
1210         unsigned long flags;
1211
1212
1213         spin_lock_irqsave(&info->slock, flags);
1214         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1215
1216         /* below added by shinhay */
1217         fcr = inb(info->ioaddr + UART_FCR);
1218         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1219                 info->ioaddr + UART_FCR);
1220         outb(fcr, info->ioaddr + UART_FCR);
1221
1222         spin_unlock_irqrestore(&info->slock, flags);
1223         /* above added by shinhay */
1224
1225         wake_up_interruptible(&tty->write_wait);
1226         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
1227                 (tty->ldisc.write_wakeup) (tty);
1228 }
1229
1230 static int mxser_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1231 {
1232         struct mxser_port *info = tty->driver_data;
1233         int retval;
1234         struct async_icount cprev, cnow;        /* kernel counter temps */
1235         struct serial_icounter_struct __user *p_cuser;
1236         unsigned long templ;
1237         unsigned long flags;
1238         void __user *argp = (void __user *)arg;
1239
1240         if (tty->index == MXSER_PORTS)
1241                 return mxser_ioctl_special(cmd, argp);
1242
1243         /* following add by Victor Yu. 01-05-2004 */
1244         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1245                 int p;
1246                 unsigned long opmode;
1247                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1248                 int shiftbit;
1249                 unsigned char val, mask;
1250
1251                 p = tty->index % 4;
1252                 if (cmd == MOXA_SET_OP_MODE) {
1253                         if (get_user(opmode, (int __user *) argp))
1254                                 return -EFAULT;
1255                         if (opmode != RS232_MODE &&
1256                                         opmode != RS485_2WIRE_MODE &&
1257                                         opmode != RS422_MODE &&
1258                                         opmode != RS485_4WIRE_MODE)
1259                                 return -EFAULT;
1260                         mask = ModeMask[p];
1261                         shiftbit = p * 2;
1262                         val = inb(info->opmode_ioaddr);
1263                         val &= mask;
1264                         val |= (opmode << shiftbit);
1265                         outb(val, info->opmode_ioaddr);
1266                 } else {
1267                         shiftbit = p * 2;
1268                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1269                         opmode &= OP_MODE_MASK;
1270                         if (copy_to_user(argp, &opmode, sizeof(int)))
1271                                 return -EFAULT;
1272                 }
1273                 return 0;
1274         }
1275         /* above add by Victor Yu. 01-05-2004 */
1276
1277         if ((cmd != TIOCGSERIAL) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1278                 if (tty->flags & (1 << TTY_IO_ERROR))
1279                         return -EIO;
1280         }
1281         switch (cmd) {
1282         case TCSBRK:            /* SVID version: non-zero arg --> no break */
1283                 retval = tty_check_change(tty);
1284                 if (retval)
1285                         return retval;
1286                 tty_wait_until_sent(tty, 0);
1287                 if (!arg)
1288                         mxser_send_break(info, HZ / 4); /* 1/4 second */
1289                 return 0;
1290         case TCSBRKP:           /* support for POSIX tcsendbreak() */
1291                 retval = tty_check_change(tty);
1292                 if (retval)
1293                         return retval;
1294                 tty_wait_until_sent(tty, 0);
1295                 mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1296                 return 0;
1297         case TIOCGSOFTCAR:
1298                 return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *)argp);
1299         case TIOCSSOFTCAR:
1300                 if (get_user(templ, (unsigned long __user *) argp))
1301                         return -EFAULT;
1302                 arg = templ;
1303                 tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
1304                 return 0;
1305         case TIOCGSERIAL:
1306                 return mxser_get_serial_info(info, argp);
1307         case TIOCSSERIAL:
1308                 return mxser_set_serial_info(info, argp);
1309         case TIOCSERGETLSR:     /* Get line status register */
1310                 return mxser_get_lsr_info(info, argp);
1311                 /*
1312                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1313                  * - mask passed in arg for lines of interest
1314                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1315                  * Caller should use TIOCGICOUNT to see which one it was
1316                  */
1317         case TIOCMIWAIT: {
1318                         DECLARE_WAITQUEUE(wait, current);
1319                         int ret;
1320                         spin_lock_irqsave(&info->slock, flags);
1321                         cprev = info->icount;   /* note the counters on entry */
1322                         spin_unlock_irqrestore(&info->slock, flags);
1323
1324                         add_wait_queue(&info->delta_msr_wait, &wait);
1325                         while (1) {
1326                                 spin_lock_irqsave(&info->slock, flags);
1327                                 cnow = info->icount;    /* atomic copy */
1328                                 spin_unlock_irqrestore(&info->slock, flags);
1329
1330                                 set_current_state(TASK_INTERRUPTIBLE);
1331                                 if (((arg & TIOCM_RNG) &&
1332                                                 (cnow.rng != cprev.rng)) ||
1333                                                 ((arg & TIOCM_DSR) &&
1334                                                 (cnow.dsr != cprev.dsr)) ||
1335                                                 ((arg & TIOCM_CD) &&
1336                                                 (cnow.dcd != cprev.dcd)) ||
1337                                                 ((arg & TIOCM_CTS) &&
1338                                                 (cnow.cts != cprev.cts))) {
1339                                         ret = 0;
1340                                         break;
1341                                 }
1342                                 /* see if a signal did it */
1343                                 if (signal_pending(current)) {
1344                                         ret = -ERESTARTSYS;
1345                                         break;
1346                                 }
1347                                 cprev = cnow;
1348                         }
1349                         current->state = TASK_RUNNING;
1350                         remove_wait_queue(&info->delta_msr_wait, &wait);
1351                         break;
1352                 }
1353                 /* NOTREACHED */
1354                 /*
1355                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1356                  * Return: write counters to the user passed counter struct
1357                  * NB: both 1->0 and 0->1 transitions are counted except for
1358                  *     RI where only 0->1 is counted.
1359                  */
1360         case TIOCGICOUNT:
1361                 spin_lock_irqsave(&info->slock, flags);
1362                 cnow = info->icount;
1363                 spin_unlock_irqrestore(&info->slock, flags);
1364                 p_cuser = argp;
1365                 /* modified by casper 1/11/2000 */
1366                 if (put_user(cnow.frame, &p_cuser->frame))
1367                         return -EFAULT;
1368                 if (put_user(cnow.brk, &p_cuser->brk))
1369                         return -EFAULT;
1370                 if (put_user(cnow.overrun, &p_cuser->overrun))
1371                         return -EFAULT;
1372                 if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1373                         return -EFAULT;
1374                 if (put_user(cnow.parity, &p_cuser->parity))
1375                         return -EFAULT;
1376                 if (put_user(cnow.rx, &p_cuser->rx))
1377                         return -EFAULT;
1378                 if (put_user(cnow.tx, &p_cuser->tx))
1379                         return -EFAULT;
1380                 put_user(cnow.cts, &p_cuser->cts);
1381                 put_user(cnow.dsr, &p_cuser->dsr);
1382                 put_user(cnow.rng, &p_cuser->rng);
1383                 put_user(cnow.dcd, &p_cuser->dcd);
1384                 return 0;
1385         case MOXA_HighSpeedOn:
1386                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1387         case MOXA_SDS_RSTICOUNTER: {
1388                         info->mon_data.rxcnt = 0;
1389                         info->mon_data.txcnt = 0;
1390                         return 0;
1391                 }
1392 /* (above) added by James. */
1393         case MOXA_ASPP_SETBAUD:{
1394                         long baud;
1395                         if (get_user(baud, (long __user *)argp))
1396                                 return -EFAULT;
1397                         mxser_set_baud(info, baud);
1398                         return 0;
1399                 }
1400         case MOXA_ASPP_GETBAUD:
1401                 if (copy_to_user(argp, &info->realbaud, sizeof(long)))
1402                         return -EFAULT;
1403
1404                 return 0;
1405
1406         case MOXA_ASPP_OQUEUE:{
1407                         int len, lsr;
1408
1409                         len = mxser_chars_in_buffer(tty);
1410
1411                         lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1412
1413                         len += (lsr ? 0 : 1);
1414
1415                         if (copy_to_user(argp, &len, sizeof(int)))
1416                                 return -EFAULT;
1417
1418                         return 0;
1419                 }
1420         case MOXA_ASPP_MON: {
1421                         int mcr, status;
1422
1423                         /* info->mon_data.ser_param = tty->termios->c_cflag; */
1424
1425                         status = mxser_get_msr(info->ioaddr, 1, tty->index);
1426                         mxser_check_modem_status(info, status);
1427
1428                         mcr = inb(info->ioaddr + UART_MCR);
1429                         if (mcr & MOXA_MUST_MCR_XON_FLAG)
1430                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1431                         else
1432                                 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1433
1434                         if (mcr & MOXA_MUST_MCR_TX_XON)
1435                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1436                         else
1437                                 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1438
1439                         if (info->tty->hw_stopped)
1440                                 info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1441                         else
1442                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1443
1444                         if (copy_to_user(argp, &info->mon_data,
1445                                         sizeof(struct mxser_mon)))
1446                                 return -EFAULT;
1447
1448                         return 0;
1449                 }
1450
1451         case MOXA_ASPP_LSTATUS: {
1452                         if (copy_to_user(argp, &info->err_shadow,
1453                                         sizeof(unsigned char)))
1454                                 return -EFAULT;
1455
1456                         info->err_shadow = 0;
1457                         return 0;
1458                 }
1459         case MOXA_SET_BAUD_METHOD: {
1460                         int method;
1461
1462                         if (get_user(method, (int __user *)argp))
1463                                 return -EFAULT;
1464                         mxser_set_baud_method[tty->index] = method;
1465                         if (copy_to_user(argp, &method, sizeof(int)))
1466                                 return -EFAULT;
1467
1468                         return 0;
1469                 }
1470         default:
1471                 return -ENOIOCTLCMD;
1472         }
1473         return 0;
1474 }
1475
1476 #ifndef CMSPAR
1477 #define CMSPAR 010000000000
1478 #endif
1479
1480 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1481 {
1482         struct mxser_port *port;
1483         int result, status;
1484         unsigned int i, j;
1485
1486         switch (cmd) {
1487         case MOXA_GET_CONF:
1488 /*              if (copy_to_user(argp, mxsercfg,
1489                                 sizeof(struct mxser_hwconf) * 4))
1490                         return -EFAULT;
1491                 return 0;*/
1492                 return -ENXIO;
1493         case MOXA_GET_MAJOR:
1494                 if (copy_to_user(argp, &ttymajor, sizeof(int)))
1495                         return -EFAULT;
1496                 return 0;
1497
1498         case MOXA_GET_CUMAJOR:
1499                 if (copy_to_user(argp, &calloutmajor, sizeof(int)))
1500                         return -EFAULT;
1501                 return 0;
1502
1503         case MOXA_CHKPORTENABLE:
1504                 result = 0;
1505
1506                 for (i = 0; i < MXSER_BOARDS; i++)
1507                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1508                                 if (mxser_boards[i].ports[j].ioaddr)
1509                                         result |= (1 << i);
1510
1511                 return put_user(result, (unsigned long __user *)argp);
1512         case MOXA_GETDATACOUNT:
1513                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1514                         return -EFAULT;
1515                 return 0;
1516         case MOXA_GETMSTATUS:
1517                 for (i = 0; i < MXSER_BOARDS; i++)
1518                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1519                                 port = &mxser_boards[i].ports[j];
1520
1521                                 GMStatus[i].ri = 0;
1522                                 if (!port->ioaddr) {
1523                                         GMStatus[i].dcd = 0;
1524                                         GMStatus[i].dsr = 0;
1525                                         GMStatus[i].cts = 0;
1526                                         continue;
1527                                 }
1528
1529                                 if (!port->tty || !port->tty->termios)
1530                                         GMStatus[i].cflag =
1531                                                 port->normal_termios.c_cflag;
1532                                 else
1533                                         GMStatus[i].cflag =
1534                                                 port->tty->termios->c_cflag;
1535
1536                                 status = inb(port->ioaddr + UART_MSR);
1537                                 if (status & 0x80 /*UART_MSR_DCD */ )
1538                                         GMStatus[i].dcd = 1;
1539                                 else
1540                                         GMStatus[i].dcd = 0;
1541
1542                                 if (status & 0x20 /*UART_MSR_DSR */ )
1543                                         GMStatus[i].dsr = 1;
1544                                 else
1545                                         GMStatus[i].dsr = 0;
1546
1547
1548                                 if (status & 0x10 /*UART_MSR_CTS */ )
1549                                         GMStatus[i].cts = 1;
1550                                 else
1551                                         GMStatus[i].cts = 0;
1552                         }
1553                 if (copy_to_user(argp, GMStatus,
1554                                 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1555                         return -EFAULT;
1556                 return 0;
1557         case MOXA_ASPP_MON_EXT: {
1558                 int status, p, shiftbit;
1559                 unsigned long opmode;
1560                 unsigned cflag, iflag;
1561
1562                 for (i = 0; i < MXSER_BOARDS; i++)
1563                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1564                                 port = &mxser_boards[i].ports[j];
1565                                 if (!port->ioaddr)
1566                                         continue;
1567
1568                                 status = mxser_get_msr(port->ioaddr, 0, i);
1569 /*                              mxser_check_modem_status(port, status); */
1570
1571                                 if (status & UART_MSR_TERI)
1572                                         port->icount.rng++;
1573                                 if (status & UART_MSR_DDSR)
1574                                         port->icount.dsr++;
1575                                 if (status & UART_MSR_DDCD)
1576                                         port->icount.dcd++;
1577                                 if (status & UART_MSR_DCTS)
1578                                         port->icount.cts++;
1579
1580                                 port->mon_data.modem_status = status;
1581                                 mon_data_ext.rx_cnt[i] = port->mon_data.rxcnt;
1582                                 mon_data_ext.tx_cnt[i] = port->mon_data.txcnt;
1583                                 mon_data_ext.up_rxcnt[i] =
1584                                         port->mon_data.up_rxcnt;
1585                                 mon_data_ext.up_txcnt[i] =
1586                                         port->mon_data.up_txcnt;
1587                                 mon_data_ext.modem_status[i] =
1588                                         port->mon_data.modem_status;
1589                                 mon_data_ext.baudrate[i] = port->realbaud;
1590
1591                                 if (!port->tty || !port->tty->termios) {
1592                                         cflag = port->normal_termios.c_cflag;
1593                                         iflag = port->normal_termios.c_iflag;
1594                                 } else {
1595                                         cflag = port->tty->termios->c_cflag;
1596                                         iflag = port->tty->termios->c_iflag;
1597                                 }
1598
1599                                 mon_data_ext.databits[i] = cflag & CSIZE;
1600
1601                                 mon_data_ext.stopbits[i] = cflag & CSTOPB;
1602
1603                                 mon_data_ext.parity[i] =
1604                                         cflag & (PARENB | PARODD | CMSPAR);
1605
1606                                 mon_data_ext.flowctrl[i] = 0x00;
1607
1608                                 if (cflag & CRTSCTS)
1609                                         mon_data_ext.flowctrl[i] |= 0x03;
1610
1611                                 if (iflag & (IXON | IXOFF))
1612                                         mon_data_ext.flowctrl[i] |= 0x0C;
1613
1614                                 if (port->type == PORT_16550A)
1615                                         mon_data_ext.fifo[i] = 1;
1616                                 else
1617                                         mon_data_ext.fifo[i] = 0;
1618
1619                                 p = i % 4;
1620                                 shiftbit = p * 2;
1621                                 opmode = inb(port->opmode_ioaddr) >> shiftbit;
1622                                 opmode &= OP_MODE_MASK;
1623
1624                                 mon_data_ext.iftype[i] = opmode;
1625
1626                         }
1627                         if (copy_to_user(argp, &mon_data_ext,
1628                                                 sizeof(mon_data_ext)))
1629                                 return -EFAULT;
1630
1631                         return 0;
1632
1633         } default:
1634                 return -ENOIOCTLCMD;
1635         }
1636         return 0;
1637 }
1638
1639 static void mxser_stoprx(struct tty_struct *tty)
1640 {
1641         struct mxser_port *info = tty->driver_data;
1642
1643         info->ldisc_stop_rx = 1;
1644         if (I_IXOFF(tty)) {
1645                 /* following add by Victor Yu. 09-02-2002 */
1646                 if (info->board->chip_flag) {
1647                         info->IER &= ~MOXA_MUST_RECV_ISR;
1648                         outb(info->IER, info->ioaddr + UART_IER);
1649                 } else if (!(info->flags & ASYNC_CLOSING)) {
1650                         info->x_char = STOP_CHAR(tty);
1651                         outb(0, info->ioaddr + UART_IER);
1652                         info->IER |= UART_IER_THRI;
1653                         outb(info->IER, info->ioaddr + UART_IER);
1654                 }
1655         }
1656
1657         if (info->tty->termios->c_cflag & CRTSCTS) {
1658                 info->MCR &= ~UART_MCR_RTS;
1659                 outb(info->MCR, info->ioaddr + UART_MCR);
1660         }
1661 }
1662
1663 static void mxser_startrx(struct tty_struct *tty)
1664 {
1665         struct mxser_port *info = tty->driver_data;
1666
1667         info->ldisc_stop_rx = 0;
1668         if (I_IXOFF(tty)) {
1669                 if (info->x_char)
1670                         info->x_char = 0;
1671                 else {
1672                         /* following add by Victor Yu. 09-02-2002 */
1673                         if (info->board->chip_flag) {
1674                                 info->IER |= MOXA_MUST_RECV_ISR;
1675                                 outb(info->IER, info->ioaddr + UART_IER);
1676                         } else if (!(info->flags & ASYNC_CLOSING)) {
1677                                 info->x_char = START_CHAR(tty);
1678                                 outb(0, info->ioaddr + UART_IER);
1679                                 info->IER |= UART_IER_THRI;
1680                                 outb(info->IER, info->ioaddr + UART_IER);
1681                         }
1682                 }
1683         }
1684
1685         if (info->tty->termios->c_cflag & CRTSCTS) {
1686                 info->MCR |= UART_MCR_RTS;
1687                 outb(info->MCR, info->ioaddr + UART_MCR);
1688         }
1689 }
1690
1691 /*
1692  * This routine is called by the upper-layer tty layer to signal that
1693  * incoming characters should be throttled.
1694  */
1695 static void mxser_throttle(struct tty_struct *tty)
1696 {
1697         struct mxser_port *info = tty->driver_data;
1698         unsigned long flags;
1699
1700         spin_lock_irqsave(&info->slock, flags);
1701         mxser_stoprx(tty);
1702         spin_unlock_irqrestore(&info->slock, flags);
1703 }
1704
1705 static void mxser_unthrottle(struct tty_struct *tty)
1706 {
1707         struct mxser_port *info = tty->driver_data;
1708         unsigned long flags;
1709
1710         spin_lock_irqsave(&info->slock, flags);
1711         mxser_startrx(tty);
1712         spin_unlock_irqrestore(&info->slock, flags);
1713 }
1714
1715 static void mxser_set_termios(struct tty_struct *tty, struct termios *old_termios)
1716 {
1717         struct mxser_port *info = tty->driver_data;
1718         unsigned long flags;
1719
1720         if ((tty->termios->c_cflag != old_termios->c_cflag) ||
1721                         (RELEVANT_IFLAG(tty->termios->c_iflag) != RELEVANT_IFLAG(old_termios->c_iflag))) {
1722
1723                 mxser_change_speed(info, old_termios);
1724
1725                 if ((old_termios->c_cflag & CRTSCTS) &&
1726                                 !(tty->termios->c_cflag & CRTSCTS)) {
1727                         tty->hw_stopped = 0;
1728                         mxser_start(tty);
1729                 }
1730         }
1731
1732 /* Handle sw stopped */
1733         if ((old_termios->c_iflag & IXON) &&
1734                         !(tty->termios->c_iflag & IXON)) {
1735                 tty->stopped = 0;
1736
1737                 /* following add by Victor Yu. 09-02-2002 */
1738                 if (info->board->chip_flag) {
1739                         spin_lock_irqsave(&info->slock, flags);
1740                         DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1741                         spin_unlock_irqrestore(&info->slock, flags);
1742                 }
1743                 /* above add by Victor Yu. 09-02-2002 */
1744
1745                 mxser_start(tty);
1746         }
1747 }
1748
1749 /*
1750  * mxser_stop() and mxser_start()
1751  *
1752  * This routines are called before setting or resetting tty->stopped.
1753  * They enable or disable transmitter interrupts, as necessary.
1754  */
1755 static void mxser_stop(struct tty_struct *tty)
1756 {
1757         struct mxser_port *info = tty->driver_data;
1758         unsigned long flags;
1759
1760         spin_lock_irqsave(&info->slock, flags);
1761         if (info->IER & UART_IER_THRI) {
1762                 info->IER &= ~UART_IER_THRI;
1763                 outb(info->IER, info->ioaddr + UART_IER);
1764         }
1765         spin_unlock_irqrestore(&info->slock, flags);
1766 }
1767
1768 static void mxser_start(struct tty_struct *tty)
1769 {
1770         struct mxser_port *info = tty->driver_data;
1771         unsigned long flags;
1772
1773         spin_lock_irqsave(&info->slock, flags);
1774         if (info->xmit_cnt && info->xmit_buf
1775                         /* && !(info->IER & UART_IER_THRI) */) {
1776                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1777                 info->IER |= UART_IER_THRI;
1778                 outb(info->IER, info->ioaddr + UART_IER);
1779         }
1780         spin_unlock_irqrestore(&info->slock, flags);
1781 }
1782
1783 /*
1784  * mxser_wait_until_sent() --- wait until the transmitter is empty
1785  */
1786 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1787 {
1788         struct mxser_port *info = tty->driver_data;
1789         unsigned long orig_jiffies, char_time;
1790         int lsr;
1791
1792         if (info->type == PORT_UNKNOWN)
1793                 return;
1794
1795         if (info->xmit_fifo_size == 0)
1796                 return;         /* Just in case.... */
1797
1798         orig_jiffies = jiffies;
1799         /*
1800          * Set the check interval to be 1/5 of the estimated time to
1801          * send a single character, and make it at least 1.  The check
1802          * interval should also be less than the timeout.
1803          *
1804          * Note: we have to use pretty tight timings here to satisfy
1805          * the NIST-PCTS.
1806          */
1807         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1808         char_time = char_time / 5;
1809         if (char_time == 0)
1810                 char_time = 1;
1811         if (timeout && timeout < char_time)
1812                 char_time = timeout;
1813         /*
1814          * If the transmitter hasn't cleared in twice the approximate
1815          * amount of time to send the entire FIFO, it probably won't
1816          * ever clear.  This assumes the UART isn't doing flow
1817          * control, which is currently the case.  Hence, if it ever
1818          * takes longer than info->timeout, this is probably due to a
1819          * UART bug of some kind.  So, we clamp the timeout parameter at
1820          * 2*info->timeout.
1821          */
1822         if (!timeout || timeout > 2 * info->timeout)
1823                 timeout = 2 * info->timeout;
1824 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1825         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
1826                 timeout, char_time);
1827         printk("jiff=%lu...", jiffies);
1828 #endif
1829         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
1830 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1831                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
1832 #endif
1833                 schedule_timeout_interruptible(char_time);
1834                 if (signal_pending(current))
1835                         break;
1836                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1837                         break;
1838         }
1839         set_current_state(TASK_RUNNING);
1840
1841 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1842         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1843 #endif
1844 }
1845
1846
1847 /*
1848  * This routine is called by tty_hangup() when a hangup is signaled.
1849  */
1850 void mxser_hangup(struct tty_struct *tty)
1851 {
1852         struct mxser_port *info = tty->driver_data;
1853
1854         mxser_flush_buffer(tty);
1855         mxser_shutdown(info);
1856         info->event = 0;
1857         info->count = 0;
1858         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1859         info->tty = NULL;
1860         wake_up_interruptible(&info->open_wait);
1861 }
1862
1863
1864 /* added by James 03-12-2004. */
1865 /*
1866  * mxser_rs_break() --- routine which turns the break handling on or off
1867  */
1868 static void mxser_rs_break(struct tty_struct *tty, int break_state)
1869 {
1870         struct mxser_port *info = tty->driver_data;
1871         unsigned long flags;
1872
1873         spin_lock_irqsave(&info->slock, flags);
1874         if (break_state == -1)
1875                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
1876                         info->ioaddr + UART_LCR);
1877         else
1878                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
1879                         info->ioaddr + UART_LCR);
1880         spin_unlock_irqrestore(&info->slock, flags);
1881 }
1882
1883 /* (above) added by James. */
1884
1885
1886 /*
1887  * This is the serial driver's generic interrupt routine
1888  */
1889 static irqreturn_t mxser_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1890 {
1891         int status, iir, i;
1892         struct mxser_board *brd = NULL;
1893         struct mxser_port *port;
1894         int max, irqbits, bits, msr;
1895         int pass_counter = 0;
1896         unsigned int int_cnt;
1897         int handled = IRQ_NONE;
1898
1899         /* spin_lock(&gm_lock); */
1900
1901         for (i = 0; i < MXSER_BOARDS; i++)
1902                 if (dev_id == &mxser_boards[i]) {
1903                         brd = dev_id;
1904                         break;
1905                 }
1906
1907         if (i == MXSER_BOARDS)
1908                 goto irq_stop;
1909         if (brd == NULL)
1910                 goto irq_stop;
1911         max = mxser_numports[brd->board_type - 1];
1912         while (1) {
1913                 irqbits = inb(brd->vector) & brd->vector_mask;
1914                 if (irqbits == brd->vector_mask)
1915                         break;
1916
1917                 handled = IRQ_HANDLED;
1918                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
1919                         if (irqbits == brd->vector_mask)
1920                                 break;
1921                         if (bits & irqbits)
1922                                 continue;
1923                         port = &brd->ports[i];
1924
1925                         int_cnt = 0;
1926                         do {
1927                                 /* following add by Victor Yu. 09-13-2002 */
1928                                 iir = inb(port->ioaddr + UART_IIR);
1929                                 if (iir & UART_IIR_NO_INT)
1930                                         break;
1931                                 iir &= MOXA_MUST_IIR_MASK;
1932                                 if (!port->tty) {
1933                                         status = inb(port->ioaddr + UART_LSR);
1934                                         outb(0x27, port->ioaddr + UART_FCR);
1935                                         inb(port->ioaddr + UART_MSR);
1936                                         break;
1937                                 }
1938                                 /* above add by Victor Yu. 09-13-2002 */
1939
1940                                 spin_lock(&port->slock);
1941                                 /* following add by Victor Yu. 09-02-2002 */
1942                                 status = inb(port->ioaddr + UART_LSR);
1943
1944                                 if (status & UART_LSR_PE)
1945                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
1946                                 if (status & UART_LSR_FE)
1947                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
1948                                 if (status & UART_LSR_OE)
1949                                         port->err_shadow |=
1950                                                 NPPI_NOTIFY_HW_OVERRUN;
1951                                 if (status & UART_LSR_BI)
1952                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
1953
1954                                 if (port->board->chip_flag) {
1955                                         /*
1956                                            if ( (status & 0x02) && !(status & 0x01) ) {
1957                                            outb(port->ioaddr+UART_FCR,  0x23);
1958                                            continue;
1959                                            }
1960                                          */
1961                                         if (iir == MOXA_MUST_IIR_GDA ||
1962                                             iir == MOXA_MUST_IIR_RDA ||
1963                                             iir == MOXA_MUST_IIR_RTO ||
1964                                             iir == MOXA_MUST_IIR_LSR)
1965                                                 mxser_receive_chars(port,
1966                                                                 &status);
1967
1968                                 } else {
1969                                         /* above add by Victor Yu. 09-02-2002 */
1970
1971                                         status &= port->read_status_mask;
1972                                         if (status & UART_LSR_DR)
1973                                                 mxser_receive_chars(port,
1974                                                                 &status);
1975                                 }
1976                                 msr = inb(port->ioaddr + UART_MSR);
1977                                 if (msr & UART_MSR_ANY_DELTA)
1978                                         mxser_check_modem_status(port, msr);
1979
1980                                 /* following add by Victor Yu. 09-13-2002 */
1981                                 if (port->board->chip_flag) {
1982                                         if (iir == 0x02 && (status &
1983                                                                 UART_LSR_THRE))
1984                                                 mxser_transmit_chars(port);
1985                                 } else {
1986                                         /* above add by Victor Yu. 09-13-2002 */
1987
1988                                         if (status & UART_LSR_THRE)
1989                                                 mxser_transmit_chars(port);
1990                                 }
1991                                 spin_unlock(&port->slock);
1992                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
1993                 }
1994                 if (pass_counter++ > MXSER_ISR_PASS_LIMIT)
1995                         break;  /* Prevent infinite loops */
1996         }
1997
1998       irq_stop:
1999         /* spin_unlock(&gm_lock); */
2000         return handled;
2001 }
2002
2003 static void mxser_receive_chars(struct mxser_port *port, int *status)
2004 {
2005         struct tty_struct *tty = port->tty;
2006         unsigned char ch, gdl;
2007         int ignored = 0;
2008         int cnt = 0;
2009         int recv_room;
2010         int max = 256;
2011         unsigned long flags;
2012
2013         spin_lock_irqsave(&port->slock, flags);
2014
2015         recv_room = tty->receive_room;
2016         if ((recv_room == 0) && (!port->ldisc_stop_rx)) {
2017                 /* mxser_throttle(tty); */
2018                 mxser_stoprx(tty);
2019                 /* return; */
2020         }
2021
2022         /* following add by Victor Yu. 09-02-2002 */
2023         if (port->board->chip_flag != MOXA_OTHER_UART) {
2024
2025                 if (*status & UART_LSR_SPECIAL)
2026                         goto intr_old;
2027                 /* following add by Victor Yu. 02-11-2004 */
2028                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2029                                 (*status & MOXA_MUST_LSR_RERR))
2030                         goto intr_old;
2031                 /* above add by Victor Yu. 02-14-2004 */
2032                 if (*status & MOXA_MUST_LSR_RERR)
2033                         goto intr_old;
2034
2035                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2036
2037                 /* add by Victor Yu. 02-11-2004 */
2038                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2039                         gdl &= MOXA_MUST_GDL_MASK;
2040                 if (gdl >= recv_room) {
2041                         if (!port->ldisc_stop_rx) {
2042                                 /* mxser_throttle(tty); */
2043                                 mxser_stoprx(tty);
2044                         }
2045                         /* return; */
2046                 }
2047                 while (gdl--) {
2048                         ch = inb(port->ioaddr + UART_RX);
2049                         tty_insert_flip_char(tty, ch, 0);
2050                         cnt++;
2051                 }
2052                 goto end_intr;
2053         }
2054  intr_old:
2055         /* above add by Victor Yu. 09-02-2002 */
2056
2057         do {
2058                 if (max-- < 0)
2059                         break;
2060
2061                 ch = inb(port->ioaddr + UART_RX);
2062                 /* following add by Victor Yu. 09-02-2002 */
2063                 if (port->board->chip_flag && (*status & UART_LSR_OE)
2064                                 /*&& !(*status&UART_LSR_DR) */)
2065                         outb(0x23, port->ioaddr + UART_FCR);
2066                 *status &= port->read_status_mask;
2067                 /* above add by Victor Yu. 09-02-2002 */
2068                 if (*status & port->ignore_status_mask) {
2069                         if (++ignored > 100)
2070                                 break;
2071                 } else {
2072                         char flag = 0;
2073                         if (*status & UART_LSR_SPECIAL) {
2074                                 if (*status & UART_LSR_BI) {
2075                                         flag = TTY_BREAK;
2076 /* added by casper 1/11/2000 */
2077                                         port->icount.brk++;
2078
2079                                         if (port->flags & ASYNC_SAK)
2080                                                 do_SAK(tty);
2081                                 } else if (*status & UART_LSR_PE) {
2082                                         flag = TTY_PARITY;
2083 /* added by casper 1/11/2000 */
2084                                         port->icount.parity++;
2085                                 } else if (*status & UART_LSR_FE) {
2086                                         flag = TTY_FRAME;
2087 /* added by casper 1/11/2000 */
2088                                         port->icount.frame++;
2089                                 } else if (*status & UART_LSR_OE) {
2090                                         flag = TTY_OVERRUN;
2091 /* added by casper 1/11/2000 */
2092                                         port->icount.overrun++;
2093                                 } else
2094                                         flags = TTY_BREAK;
2095                         } else
2096                                 flags = 0;
2097                         tty_insert_flip_char(tty, ch, flag);
2098                         cnt++;
2099                         if (cnt >= recv_room) {
2100                                 if (!port->ldisc_stop_rx) {
2101                                         /* mxser_throttle(tty); */
2102                                         mxser_stoprx(tty);
2103                                 }
2104                                 break;
2105                         }
2106
2107                 }
2108
2109                 /* following add by Victor Yu. 09-02-2002 */
2110                 if (port->board->chip_flag)
2111                         break;
2112
2113                 /* mask by Victor Yu. 09-02-2002
2114                  *status = inb(port->ioaddr + UART_LSR) & port->read_status_mask;
2115                  */
2116                 /* following add by Victor Yu. 09-02-2002 */
2117                 *status = inb(port->ioaddr + UART_LSR);
2118                 /* above add by Victor Yu. 09-02-2002 */
2119         } while (*status & UART_LSR_DR);
2120
2121 end_intr:               /* add by Victor Yu. 09-02-2002 */
2122         mxvar_log.rxcnt[port->tty->index] += cnt;
2123         port->mon_data.rxcnt += cnt;
2124         port->mon_data.up_rxcnt += cnt;
2125         spin_unlock_irqrestore(&port->slock, flags);
2126
2127         tty_flip_buffer_push(tty);
2128 }
2129
2130 static void mxser_transmit_chars(struct mxser_port *port)
2131 {
2132         int count, cnt;
2133         unsigned long flags;
2134
2135         spin_lock_irqsave(&port->slock, flags);
2136
2137         if (port->x_char) {
2138                 outb(port->x_char, port->ioaddr + UART_TX);
2139                 port->x_char = 0;
2140                 mxvar_log.txcnt[port->tty->index]++;
2141                 port->mon_data.txcnt++;
2142                 port->mon_data.up_txcnt++;
2143
2144 /* added by casper 1/11/2000 */
2145                 port->icount.tx++;
2146                 goto unlock;
2147         }
2148
2149         if (port->xmit_buf == 0)
2150                 goto unlock;
2151
2152         if (port->xmit_cnt == 0) {
2153                 if (port->xmit_cnt < WAKEUP_CHARS) { /* XXX what's this for?? */
2154                         set_bit(MXSER_EVENT_TXLOW, &port->event);
2155                         schedule_work(&port->tqueue);
2156                 }
2157                 goto unlock;
2158         }
2159         if (port->tty->stopped || (port->tty->hw_stopped &&
2160                         (port->type != PORT_16550A) &&
2161                         (!port->board->chip_flag))) {
2162                 port->IER &= ~UART_IER_THRI;
2163                 outb(port->IER, port->ioaddr + UART_IER);
2164                 goto unlock;
2165         }
2166
2167         cnt = port->xmit_cnt;
2168         count = port->xmit_fifo_size;
2169         do {
2170                 outb(port->xmit_buf[port->xmit_tail++],
2171                         port->ioaddr + UART_TX);
2172                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2173                 if (--port->xmit_cnt <= 0)
2174                         break;
2175         } while (--count > 0);
2176         mxvar_log.txcnt[port->tty->index] += (cnt - port->xmit_cnt);
2177
2178 /* added by James 03-12-2004. */
2179         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2180         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2181
2182 /* added by casper 1/11/2000 */
2183         port->icount.tx += (cnt - port->xmit_cnt);
2184
2185         if (port->xmit_cnt < WAKEUP_CHARS) {
2186                 set_bit(MXSER_EVENT_TXLOW, &port->event);
2187                 schedule_work(&port->tqueue);
2188         }
2189         if (port->xmit_cnt <= 0) {
2190                 port->IER &= ~UART_IER_THRI;
2191                 outb(port->IER, port->ioaddr + UART_IER);
2192         }
2193 unlock:
2194         spin_unlock_irqrestore(&port->slock, flags);
2195 }
2196
2197 static void mxser_check_modem_status(struct mxser_port *port, int status)
2198 {
2199         /* update input line counters */
2200         if (status & UART_MSR_TERI)
2201                 port->icount.rng++;
2202         if (status & UART_MSR_DDSR)
2203                 port->icount.dsr++;
2204         if (status & UART_MSR_DDCD)
2205                 port->icount.dcd++;
2206         if (status & UART_MSR_DCTS)
2207                 port->icount.cts++;
2208         port->mon_data.modem_status = status;
2209         wake_up_interruptible(&port->delta_msr_wait);
2210
2211         if ((port->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
2212                 if (status & UART_MSR_DCD)
2213                         wake_up_interruptible(&port->open_wait);
2214                 schedule_work(&port->tqueue);
2215         }
2216
2217         if (port->flags & ASYNC_CTS_FLOW) {
2218                 if (port->tty->hw_stopped) {
2219                         if (status & UART_MSR_CTS) {
2220                                 port->tty->hw_stopped = 0;
2221
2222                                 if ((port->type != PORT_16550A) &&
2223                                                 (!port->board->chip_flag)) {
2224                                         outb(port->IER & ~UART_IER_THRI,
2225                                                 port->ioaddr + UART_IER);
2226                                         port->IER |= UART_IER_THRI;
2227                                         outb(port->IER, port->ioaddr +
2228                                                         UART_IER);
2229                                 }
2230                                 set_bit(MXSER_EVENT_TXLOW, &port->event);
2231                                 schedule_work(&port->tqueue);
2232                         }
2233                 } else {
2234                         if (!(status & UART_MSR_CTS)) {
2235                                 port->tty->hw_stopped = 1;
2236                                 if (port->type != PORT_16550A &&
2237                                                 !port->board->chip_flag) {
2238                                         port->IER &= ~UART_IER_THRI;
2239                                         outb(port->IER, port->ioaddr +
2240                                                         UART_IER);
2241                                 }
2242                         }
2243                 }
2244         }
2245 }
2246
2247 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp, struct mxser_port *port)
2248 {
2249         DECLARE_WAITQUEUE(wait, current);
2250         int retval;
2251         int do_clocal = 0;
2252         unsigned long flags;
2253
2254         /*
2255          * If non-blocking mode is set, or the port is not enabled,
2256          * then make the check up front and then exit.
2257          */
2258         if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) {
2259                 port->flags |= ASYNC_NORMAL_ACTIVE;
2260                 return 0;
2261         }
2262
2263         if (tty->termios->c_cflag & CLOCAL)
2264                 do_clocal = 1;
2265
2266         /*
2267          * Block waiting for the carrier detect and the line to become
2268          * free (i.e., not in use by the callout).  While we are in
2269          * this loop, port->count is dropped by one, so that
2270          * mxser_close() knows when to free things.  We restore it upon
2271          * exit, either normal or abnormal.
2272          */
2273         retval = 0;
2274         add_wait_queue(&port->open_wait, &wait);
2275
2276         spin_lock_irqsave(&port->slock, flags);
2277         if (!tty_hung_up_p(filp))
2278                 port->count--;
2279         spin_unlock_irqrestore(&port->slock, flags);
2280         port->blocked_open++;
2281         while (1) {
2282                 spin_lock_irqsave(&port->slock, flags);
2283                 outb(inb(port->ioaddr + UART_MCR) |
2284                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
2285                 spin_unlock_irqrestore(&port->slock, flags);
2286                 set_current_state(TASK_INTERRUPTIBLE);
2287                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
2288                         if (port->flags & ASYNC_HUP_NOTIFY)
2289                                 retval = -EAGAIN;
2290                         else
2291                                 retval = -ERESTARTSYS;
2292                         break;
2293                 }
2294                 if (!(port->flags & ASYNC_CLOSING) &&
2295                                 (do_clocal ||
2296                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
2297                         break;
2298                 if (signal_pending(current)) {
2299                         retval = -ERESTARTSYS;
2300                         break;
2301                 }
2302                 schedule();
2303         }
2304         set_current_state(TASK_RUNNING);
2305         remove_wait_queue(&port->open_wait, &wait);
2306         if (!tty_hung_up_p(filp))
2307                 port->count++;
2308         port->blocked_open--;
2309         if (retval)
2310                 return retval;
2311         port->flags |= ASYNC_NORMAL_ACTIVE;
2312         return 0;
2313 }
2314
2315 static int mxser_startup(struct mxser_port *info)
2316 {
2317         unsigned long page;
2318         unsigned long flags;
2319
2320         page = __get_free_page(GFP_KERNEL);
2321         if (!page)
2322                 return -ENOMEM;
2323
2324         spin_lock_irqsave(&info->slock, flags);
2325
2326         if (info->flags & ASYNC_INITIALIZED) {
2327                 free_page(page);
2328                 spin_unlock_irqrestore(&info->slock, flags);
2329                 return 0;
2330         }
2331
2332         if (!info->ioaddr || !info->type) {
2333                 if (info->tty)
2334                         set_bit(TTY_IO_ERROR, &info->tty->flags);
2335                 free_page(page);
2336                 spin_unlock_irqrestore(&info->slock, flags);
2337                 return 0;
2338         }
2339         if (info->xmit_buf)
2340                 free_page(page);
2341         else
2342                 info->xmit_buf = (unsigned char *) page;
2343
2344         /*
2345          * Clear the FIFO buffers and disable them
2346          * (they will be reenabled in mxser_change_speed())
2347          */
2348         if (info->board->chip_flag)
2349                 outb((UART_FCR_CLEAR_RCVR |
2350                         UART_FCR_CLEAR_XMIT |
2351                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
2352         else
2353                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
2354                         info->ioaddr + UART_FCR);
2355
2356         /*
2357          * At this point there's no way the LSR could still be 0xFF;
2358          * if it is, then bail out, because there's likely no UART
2359          * here.
2360          */
2361         if (inb(info->ioaddr + UART_LSR) == 0xff) {
2362                 spin_unlock_irqrestore(&info->slock, flags);
2363                 if (capable(CAP_SYS_ADMIN)) {
2364                         if (info->tty)
2365                                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2366                         return 0;
2367                 } else
2368                         return -ENODEV;
2369         }
2370
2371         /*
2372          * Clear the interrupt registers.
2373          */
2374         (void) inb(info->ioaddr + UART_LSR);
2375         (void) inb(info->ioaddr + UART_RX);
2376         (void) inb(info->ioaddr + UART_IIR);
2377         (void) inb(info->ioaddr + UART_MSR);
2378
2379         /*
2380          * Now, initialize the UART
2381          */
2382         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
2383         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
2384         outb(info->MCR, info->ioaddr + UART_MCR);
2385
2386         /*
2387          * Finally, enable interrupts
2388          */
2389         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
2390         /* info->IER = UART_IER_RLSI | UART_IER_RDI; */
2391
2392         /* following add by Victor Yu. 08-30-2002 */
2393         if (info->board->chip_flag)
2394                 info->IER |= MOXA_MUST_IER_EGDAI;
2395         /* above add by Victor Yu. 08-30-2002 */
2396         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
2397
2398         /*
2399          * And clear the interrupt registers again for luck.
2400          */
2401         (void) inb(info->ioaddr + UART_LSR);
2402         (void) inb(info->ioaddr + UART_RX);
2403         (void) inb(info->ioaddr + UART_IIR);
2404         (void) inb(info->ioaddr + UART_MSR);
2405
2406         if (info->tty)
2407                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2408         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2409
2410         /*
2411          * and set the speed of the serial port
2412          */
2413         spin_unlock_irqrestore(&info->slock, flags);
2414         mxser_change_speed(info, NULL);
2415
2416         info->flags |= ASYNC_INITIALIZED;
2417         return 0;
2418 }
2419
2420 /*
2421  * This routine will shutdown a serial port; interrupts maybe disabled, and
2422  * DTR is dropped if the hangup on close termio flag is on.
2423  */
2424 static void mxser_shutdown(struct mxser_port *info)
2425 {
2426         unsigned long flags;
2427
2428         if (!(info->flags & ASYNC_INITIALIZED))
2429                 return;
2430
2431         spin_lock_irqsave(&info->slock, flags);
2432
2433         /*
2434          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
2435          * here so the queue might never be waken up
2436          */
2437         wake_up_interruptible(&info->delta_msr_wait);
2438
2439         /*
2440          * Free the IRQ, if necessary
2441          */
2442         if (info->xmit_buf) {
2443                 free_page((unsigned long) info->xmit_buf);
2444                 info->xmit_buf = NULL;
2445         }
2446
2447         info->IER = 0;
2448         outb(0x00, info->ioaddr + UART_IER);
2449
2450         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
2451                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
2452         outb(info->MCR, info->ioaddr + UART_MCR);
2453
2454         /* clear Rx/Tx FIFO's */
2455         /* following add by Victor Yu. 08-30-2002 */
2456         if (info->board->chip_flag)
2457                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
2458                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
2459                                 info->ioaddr + UART_FCR);
2460         else
2461                 /* above add by Victor Yu. 08-30-2002 */
2462                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
2463                         info->ioaddr + UART_FCR);
2464
2465         /* read data port to reset things */
2466         (void) inb(info->ioaddr + UART_RX);
2467
2468         if (info->tty)
2469                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2470
2471         info->flags &= ~ASYNC_INITIALIZED;
2472
2473         /* following add by Victor Yu. 09-23-2002 */
2474         if (info->board->chip_flag)
2475                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
2476         /* above add by Victor Yu. 09-23-2002 */
2477
2478         spin_unlock_irqrestore(&info->slock, flags);
2479 }
2480
2481 /*
2482  * This routine is called to set the UART divisor registers to match
2483  * the specified baud rate for a serial port.
2484  */
2485 static int mxser_change_speed(struct mxser_port *info,
2486                 struct termios *old_termios)
2487 {
2488         unsigned cflag, cval, fcr;
2489         int ret = 0;
2490         unsigned char status;
2491         long baud;
2492         unsigned long flags;
2493
2494         if (!info->tty || !info->tty->termios)
2495                 return ret;
2496         cflag = info->tty->termios->c_cflag;
2497         if (!(info->ioaddr))
2498                 return ret;
2499
2500 #ifndef B921600
2501 #define B921600 (B460800 +1)
2502 #endif
2503         if (mxser_set_baud_method[info->tty->index] == 0) {
2504                 baud = tty_get_baud_rate(info->tty);
2505                 mxser_set_baud(info, baud);
2506         }
2507
2508         /* byte size and parity */
2509         switch (cflag & CSIZE) {
2510         case CS5:
2511                 cval = 0x00;
2512                 break;
2513         case CS6:
2514                 cval = 0x01;
2515                 break;
2516         case CS7:
2517                 cval = 0x02;
2518                 break;
2519         case CS8:
2520                 cval = 0x03;
2521                 break;
2522         default:
2523                 cval = 0x00;
2524                 break;          /* too keep GCC shut... */
2525         }
2526         if (cflag & CSTOPB)
2527                 cval |= 0x04;
2528         if (cflag & PARENB)
2529                 cval |= UART_LCR_PARITY;
2530         if (!(cflag & PARODD))
2531                 cval |= UART_LCR_EPAR;
2532         if (cflag & CMSPAR)
2533                 cval |= UART_LCR_SPAR;
2534
2535         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
2536                 if (info->board->chip_flag) {
2537                         fcr = UART_FCR_ENABLE_FIFO;
2538                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
2539                         SET_MOXA_MUST_FIFO_VALUE(info);
2540                 } else
2541                         fcr = 0;
2542         } else {
2543                 fcr = UART_FCR_ENABLE_FIFO;
2544                 /* following add by Victor Yu. 08-30-2002 */
2545                 if (info->board->chip_flag) {
2546                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
2547                         SET_MOXA_MUST_FIFO_VALUE(info);
2548                 } else {
2549                         /* above add by Victor Yu. 08-30-2002 */
2550                         switch (info->rx_trigger) {
2551                         case 1:
2552                                 fcr |= UART_FCR_TRIGGER_1;
2553                                 break;
2554                         case 4:
2555                                 fcr |= UART_FCR_TRIGGER_4;
2556                                 break;
2557                         case 8:
2558                                 fcr |= UART_FCR_TRIGGER_8;
2559                                 break;
2560                         default:
2561                                 fcr |= UART_FCR_TRIGGER_14;
2562                                 break;
2563                         }
2564                 }
2565         }
2566
2567         /* CTS flow control flag and modem status interrupts */
2568         info->IER &= ~UART_IER_MSI;
2569         info->MCR &= ~UART_MCR_AFE;
2570         if (cflag & CRTSCTS) {
2571                 info->flags |= ASYNC_CTS_FLOW;
2572                 info->IER |= UART_IER_MSI;
2573                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
2574                         info->MCR |= UART_MCR_AFE;
2575 /*                      status = mxser_get_msr(info->ioaddr, 0, info->port); */
2576 /*
2577         save_flags(flags);
2578         cli();
2579         status = inb(baseaddr + UART_MSR);
2580         restore_flags(flags);
2581 */
2582                         /* mxser_check_modem_status(info, status); */
2583                 } else {
2584 /*                      status = mxser_get_msr(info->ioaddr, 0, info->port); */
2585                         /* MX_LOCK(&info->slock); */
2586                         status = inb(info->ioaddr + UART_MSR);
2587                         /* MX_UNLOCK(&info->slock); */
2588                         if (info->tty->hw_stopped) {
2589                                 if (status & UART_MSR_CTS) {
2590                                         info->tty->hw_stopped = 0;
2591                                         if (info->type != PORT_16550A &&
2592                                                         !info->board->chip_flag) {
2593                                                 outb(info->IER & ~UART_IER_THRI,
2594                                                         info->ioaddr +
2595                                                         UART_IER);
2596                                                 info->IER |= UART_IER_THRI;
2597                                                 outb(info->IER, info->ioaddr +
2598                                                                 UART_IER);
2599                                         }
2600                                         set_bit(MXSER_EVENT_TXLOW, &info->event);
2601                                         schedule_work(&info->tqueue);                           }
2602                         } else {
2603                                 if (!(status & UART_MSR_CTS)) {
2604                                         info->tty->hw_stopped = 1;
2605                                         if ((info->type != PORT_16550A) &&
2606                                                         (!info->board->chip_flag)) {
2607                                                 info->IER &= ~UART_IER_THRI;
2608                                                 outb(info->IER, info->ioaddr +
2609                                                                 UART_IER);
2610                                         }
2611                                 }
2612                         }
2613                 }
2614         } else {
2615                 info->flags &= ~ASYNC_CTS_FLOW;
2616         }
2617         outb(info->MCR, info->ioaddr + UART_MCR);
2618         if (cflag & CLOCAL) {
2619                 info->flags &= ~ASYNC_CHECK_CD;
2620         } else {
2621                 info->flags |= ASYNC_CHECK_CD;
2622                 info->IER |= UART_IER_MSI;
2623         }
2624         outb(info->IER, info->ioaddr + UART_IER);
2625
2626         /*
2627          * Set up parity check flag
2628          */
2629         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
2630         if (I_INPCK(info->tty))
2631                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
2632         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2633                 info->read_status_mask |= UART_LSR_BI;
2634
2635         info->ignore_status_mask = 0;
2636
2637         if (I_IGNBRK(info->tty)) {
2638                 info->ignore_status_mask |= UART_LSR_BI;
2639                 info->read_status_mask |= UART_LSR_BI;
2640                 /*
2641                  * If we're ignore parity and break indicators, ignore
2642                  * overruns too.  (For real raw support).
2643                  */
2644                 if (I_IGNPAR(info->tty)) {
2645                         info->ignore_status_mask |=
2646                                                 UART_LSR_OE |
2647                                                 UART_LSR_PE |
2648                                                 UART_LSR_FE;
2649                         info->read_status_mask |=
2650                                                 UART_LSR_OE |
2651                                                 UART_LSR_PE |
2652                                                 UART_LSR_FE;
2653                 }
2654         }
2655         /* following add by Victor Yu. 09-02-2002 */
2656         if (info->board->chip_flag) {
2657                 spin_lock_irqsave(&info->slock, flags);
2658                 SET_MOXA_MUST_XON1_VALUE(info->ioaddr, START_CHAR(info->tty));
2659                 SET_MOXA_MUST_XOFF1_VALUE(info->ioaddr, STOP_CHAR(info->tty));
2660                 if (I_IXON(info->tty)) {
2661                         ENABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
2662                 } else {
2663                         DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
2664                 }
2665                 if (I_IXOFF(info->tty)) {
2666                         ENABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
2667                 } else {
2668                         DISABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
2669                 }
2670                 /*
2671                    if ( I_IXANY(info->tty) ) {
2672                    info->MCR |= MOXA_MUST_MCR_XON_ANY;
2673                    ENABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->ioaddr);
2674                    } else {
2675                    info->MCR &= ~MOXA_MUST_MCR_XON_ANY;
2676                    DISABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->ioaddr);
2677                    }
2678                  */
2679                 spin_unlock_irqrestore(&info->slock, flags);
2680         }
2681         /* above add by Victor Yu. 09-02-2002 */
2682
2683
2684         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
2685         outb(cval, info->ioaddr + UART_LCR);
2686
2687         return ret;
2688 }
2689
2690
2691 static int mxser_set_baud(struct mxser_port *info, long newspd)
2692 {
2693         int quot = 0;
2694         unsigned char cval;
2695         int ret = 0;
2696         unsigned long flags;
2697
2698         if (!info->tty || !info->tty->termios)
2699                 return ret;
2700
2701         if (!(info->ioaddr))
2702                 return ret;
2703
2704         if (newspd > info->max_baud)
2705                 return 0;
2706
2707         info->realbaud = newspd;
2708         if (newspd == 134) {
2709                 quot = (2 * info->baud_base / 269);
2710         } else if (newspd) {
2711                 quot = info->baud_base / newspd;
2712                 if (quot == 0)
2713                         quot = 1;
2714         } else {
2715                 quot = 0;
2716         }
2717
2718         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
2719         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
2720
2721         if (quot) {
2722                 spin_lock_irqsave(&info->slock, flags);
2723                 info->MCR |= UART_MCR_DTR;
2724                 outb(info->MCR, info->ioaddr + UART_MCR);
2725                 spin_unlock_irqrestore(&info->slock, flags);
2726         } else {
2727                 spin_lock_irqsave(&info->slock, flags);
2728                 info->MCR &= ~UART_MCR_DTR;
2729                 outb(info->MCR, info->ioaddr + UART_MCR);
2730                 spin_unlock_irqrestore(&info->slock, flags);
2731                 return ret;
2732         }
2733
2734         cval = inb(info->ioaddr + UART_LCR);
2735
2736         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
2737
2738         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
2739         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
2740         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
2741
2742
2743         return ret;
2744 }
2745
2746 /*
2747  * ------------------------------------------------------------
2748  * friends of mxser_ioctl()
2749  * ------------------------------------------------------------
2750  */
2751 static int mxser_get_serial_info(struct mxser_port *info,
2752                 struct serial_struct __user *retinfo)
2753 {
2754         struct serial_struct tmp;
2755
2756         if (!retinfo)
2757                 return -EFAULT;
2758         memset(&tmp, 0, sizeof(tmp));
2759         tmp.type = info->type;
2760         tmp.line = info->tty->index;
2761         tmp.port = info->ioaddr;
2762         tmp.irq = info->board->irq;
2763         tmp.flags = info->flags;
2764         tmp.baud_base = info->baud_base;
2765         tmp.close_delay = info->close_delay;
2766         tmp.closing_wait = info->closing_wait;
2767         tmp.custom_divisor = info->custom_divisor;
2768         tmp.hub6 = 0;
2769         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2770                 return -EFAULT;
2771         return 0;
2772 }
2773
2774 static int mxser_set_serial_info(struct mxser_port *info,
2775                 struct serial_struct __user *new_info)
2776 {
2777         struct serial_struct new_serial;
2778         unsigned int flags;
2779         int retval = 0;
2780
2781         if (!new_info || !info->ioaddr)
2782                 return -EFAULT;
2783         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2784                 return -EFAULT;
2785
2786         if ((new_serial.irq != info->board->irq) ||
2787                         (new_serial.port != info->ioaddr) ||
2788                         (new_serial.custom_divisor != info->custom_divisor) ||
2789                         (new_serial.baud_base != info->baud_base))
2790                 return -EPERM;
2791
2792         flags = info->flags & ASYNC_SPD_MASK;
2793
2794         if (!capable(CAP_SYS_ADMIN)) {
2795                 if ((new_serial.baud_base != info->baud_base) ||
2796                                 (new_serial.close_delay != info->close_delay) ||
2797                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK)))
2798                         return -EPERM;
2799                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
2800                                 (new_serial.flags & ASYNC_USR_MASK));
2801         } else {
2802                 /*
2803                  * OK, past this point, all the error checking has been done.
2804                  * At this point, we start making changes.....
2805                  */
2806                 info->flags = ((info->flags & ~ASYNC_FLAGS) |
2807                                 (new_serial.flags & ASYNC_FLAGS));
2808                 info->close_delay = new_serial.close_delay * HZ / 100;
2809                 info->closing_wait = new_serial.closing_wait * HZ / 100;
2810                 info->tty->low_latency =
2811                                 (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2812                 info->tty->low_latency = 0;     /* (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; */
2813         }
2814
2815         /* added by casper, 3/17/2000, for mouse */
2816         info->type = new_serial.type;
2817
2818         process_txrx_fifo(info);
2819
2820         if (info->flags & ASYNC_INITIALIZED) {
2821                 if (flags != (info->flags & ASYNC_SPD_MASK))
2822                         mxser_change_speed(info, NULL);
2823         } else
2824                 retval = mxser_startup(info);
2825
2826         return retval;
2827 }
2828
2829 /*
2830  * mxser_get_lsr_info - get line status register info
2831  *
2832  * Purpose: Let user call ioctl() to get info when the UART physically
2833  *          is emptied.  On bus types like RS485, the transmitter must
2834  *          release the bus after transmitting. This must be done when
2835  *          the transmit shift register is empty, not be done when the
2836  *          transmit holding register is empty.  This functionality
2837  *          allows an RS485 driver to be written in user space.
2838  */
2839 static int mxser_get_lsr_info(struct mxser_port *info,
2840                 unsigned int __user *value)
2841 {
2842         unsigned char status;
2843         unsigned int result;
2844         unsigned long flags;
2845
2846         spin_lock_irqsave(&info->slock, flags);
2847         status = inb(info->ioaddr + UART_LSR);
2848         spin_unlock_irqrestore(&info->slock, flags);
2849         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
2850         return put_user(result, value);
2851 }
2852
2853 /*
2854  * This routine sends a break character out the serial port.
2855  */
2856 static void mxser_send_break(struct mxser_port *info, int duration)
2857 {
2858         unsigned long flags;
2859
2860         if (!info->ioaddr)
2861                 return;
2862         set_current_state(TASK_INTERRUPTIBLE);
2863         spin_lock_irqsave(&info->slock, flags);
2864         outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2865                 info->ioaddr + UART_LCR);
2866         spin_unlock_irqrestore(&info->slock, flags);
2867         schedule_timeout(duration);
2868         spin_lock_irqsave(&info->slock, flags);
2869         outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2870                 info->ioaddr + UART_LCR);
2871         spin_unlock_irqrestore(&info->slock, flags);
2872 }
2873
2874 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
2875 {
2876         struct mxser_port *info = tty->driver_data;
2877         unsigned char control, status;
2878         unsigned long flags;
2879
2880
2881         if (tty->index == MXSER_PORTS)
2882                 return -ENOIOCTLCMD;
2883         if (tty->flags & (1 << TTY_IO_ERROR))
2884                 return -EIO;
2885
2886         control = info->MCR;
2887
2888         spin_lock_irqsave(&info->slock, flags);
2889         status = inb(info->ioaddr + UART_MSR);
2890         if (status & UART_MSR_ANY_DELTA)
2891                 mxser_check_modem_status(info, status);
2892         spin_unlock_irqrestore(&info->slock, flags);
2893         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
2894                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
2895                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
2896                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
2897                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
2898                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
2899 }
2900
2901 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
2902                 unsigned int set, unsigned int clear)
2903 {
2904         struct mxser_port *info = tty->driver_data;
2905         unsigned long flags;
2906
2907
2908         if (tty->index == MXSER_PORTS)
2909                 return -ENOIOCTLCMD;
2910         if (tty->flags & (1 << TTY_IO_ERROR))
2911                 return -EIO;
2912
2913         spin_lock_irqsave(&info->slock, flags);
2914
2915         if (set & TIOCM_RTS)
2916                 info->MCR |= UART_MCR_RTS;
2917         if (set & TIOCM_DTR)
2918                 info->MCR |= UART_MCR_DTR;
2919
2920         if (clear & TIOCM_RTS)
2921                 info->MCR &= ~UART_MCR_RTS;
2922         if (clear & TIOCM_DTR)
2923                 info->MCR &= ~UART_MCR_DTR;
2924
2925         outb(info->MCR, info->ioaddr + UART_MCR);
2926         spin_unlock_irqrestore(&info->slock, flags);
2927         return 0;
2928 }
2929
2930
2931 static int mxser_read_register(int, unsigned short *);
2932 static int mxser_program_mode(int);
2933 static void mxser_normal_mode(int);
2934
2935 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2936 {
2937         int id, i, bits;
2938         unsigned short regs[16], irq;
2939         unsigned char scratch, scratch2;
2940
2941         brd->chip_flag = MOXA_OTHER_UART;
2942
2943         id = mxser_read_register(cap, regs);
2944         if (id == C168_ASIC_ID) {
2945                 brd->board_type = MXSER_BOARD_C168_ISA;
2946                 brd->nports = 8;
2947         } else if (id == C104_ASIC_ID) {
2948                 brd->board_type = MXSER_BOARD_C104_ISA;
2949                 brd->nports = 4;
2950         } else if (id == C102_ASIC_ID) {
2951                 brd->board_type = MXSER_BOARD_C102_ISA;
2952                 brd->nports = 2;
2953         } else if (id == CI132_ASIC_ID) {
2954                 brd->board_type = MXSER_BOARD_CI132;
2955                 brd->nports = 2;
2956         } else if (id == CI134_ASIC_ID) {
2957                 brd->board_type = MXSER_BOARD_CI134;
2958                 brd->nports = 4;
2959         } else if (id == CI104J_ASIC_ID) {
2960                 brd->board_type = MXSER_BOARD_CI104J;
2961                 brd->nports = 4;
2962         } else
2963                 return 0;
2964
2965         irq = 0;
2966         if (brd->nports == 2) {
2967                 irq = regs[9] & 0xF000;
2968                 irq = irq | (irq >> 4);
2969                 if (irq != (regs[9] & 0xFF00))
2970                         return MXSER_ERR_IRQ_CONFLIT;
2971         } else if (brd->nports == 4) {
2972                 irq = regs[9] & 0xF000;
2973                 irq = irq | (irq >> 4);
2974                 irq = irq | (irq >> 8);
2975                 if (irq != regs[9])
2976                         return MXSER_ERR_IRQ_CONFLIT;
2977         } else if (brd->nports == 8) {
2978                 irq = regs[9] & 0xF000;
2979                 irq = irq | (irq >> 4);
2980                 irq = irq | (irq >> 8);
2981                 if ((irq != regs[9]) || (irq != regs[10]))
2982                         return MXSER_ERR_IRQ_CONFLIT;
2983         }
2984
2985         if (!irq)
2986                 return MXSER_ERR_IRQ;
2987         brd->irq = ((int)(irq & 0xF000) >> 12);
2988         for (i = 0; i < 8; i++)
2989                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2990         if ((regs[12] & 0x80) == 0)
2991                 return MXSER_ERR_VECTOR;
2992         brd->vector = (int)regs[11];    /* interrupt vector */
2993         if (id == 1)
2994                 brd->vector_mask = 0x00FF;
2995         else
2996                 brd->vector_mask = 0x000F;
2997         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2998                 if (regs[12] & bits) {
2999                         brd->ports[i].baud_base = 921600;
3000                         brd->ports[i].max_baud = 921600;        /* add by Victor Yu. 09-04-2002 */
3001                 } else {
3002                         brd->ports[i].baud_base = 115200;
3003                         brd->ports[i].max_baud = 115200;        /* add by Victor Yu. 09-04-2002 */
3004                 }
3005         }
3006         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
3007         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
3008         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
3009         outb(scratch2, cap + UART_LCR);
3010         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
3011         scratch = inb(cap + UART_IIR);
3012
3013         if (scratch & 0xC0)
3014                 brd->uart_type = PORT_16550A;
3015         else
3016                 brd->uart_type = PORT_16450;
3017         if (id == 1)
3018                 brd->nports = 8;
3019         else
3020                 brd->nports = 4;
3021         if (!request_region(brd->ports[0].ioaddr, 8 * brd->nports, "mxser(IO)"))
3022                 return MXSER_ERR_IOADDR;
3023         if (!request_region(brd->vector, 1, "mxser(vector)")) {
3024                 release_region(brd->ports[0].ioaddr, 8 * brd->nports);
3025                 return MXSER_ERR_VECTOR;
3026         }
3027         return brd->nports;
3028 }
3029
3030 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
3031 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
3032 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
3033 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
3034 #define EN_CCMD         0x000   /* Chip's command register     */
3035 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
3036 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
3037 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
3038 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
3039 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
3040 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
3041 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
3042 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
3043 static int mxser_read_register(int port, unsigned short *regs)
3044 {
3045         int i, k, value, id;
3046         unsigned int j;
3047
3048         id = mxser_program_mode(port);
3049         if (id < 0)
3050                 return id;
3051         for (i = 0; i < 14; i++) {
3052                 k = (i & 0x3F) | 0x180;
3053                 for (j = 0x100; j > 0; j >>= 1) {
3054                         outb(CHIP_CS, port);
3055                         if (k & j) {
3056                                 outb(CHIP_CS | CHIP_DO, port);
3057                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
3058                         } else {
3059                                 outb(CHIP_CS, port);
3060                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
3061                         }
3062                 }
3063                 (void)inb(port);
3064                 value = 0;
3065                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
3066                         outb(CHIP_CS, port);
3067                         outb(CHIP_CS | CHIP_SK, port);
3068                         if (inb(port) & CHIP_DI)
3069                                 value |= j;
3070                 }
3071                 regs[i] = value;
3072                 outb(0, port);
3073         }
3074         mxser_normal_mode(port);
3075         return id;
3076 }
3077
3078 static int mxser_program_mode(int port)
3079 {
3080         int id, i, j, n;
3081         /* unsigned long flags; */
3082
3083         spin_lock(&gm_lock);
3084         outb(0, port);
3085         outb(0, port);
3086         outb(0, port);
3087         (void)inb(port);
3088         (void)inb(port);
3089         outb(0, port);
3090         (void)inb(port);
3091         /* restore_flags(flags); */
3092         spin_unlock(&gm_lock);
3093
3094         id = inb(port + 1) & 0x1F;
3095         if ((id != C168_ASIC_ID) &&
3096                         (id != C104_ASIC_ID) &&
3097                         (id != C102_ASIC_ID) &&
3098                         (id != CI132_ASIC_ID) &&
3099                         (id != CI134_ASIC_ID) &&
3100                         (id != CI104J_ASIC_ID))
3101                 return -1;
3102         for (i = 0, j = 0; i < 4; i++) {
3103                 n = inb(port + 2);
3104                 if (n == 'M') {
3105                         j = 1;
3106                 } else if ((j == 1) && (n == 1)) {
3107                         j = 2;
3108                         break;
3109                 } else
3110                         j = 0;
3111         }
3112         if (j != 2)
3113                 id = -2;
3114         return id;
3115 }
3116
3117 static void mxser_normal_mode(int port)
3118 {
3119         int i, n;
3120
3121         outb(0xA5, port + 1);
3122         outb(0x80, port + 3);
3123         outb(12, port + 0);     /* 9600 bps */
3124         outb(0, port + 1);
3125         outb(0x03, port + 3);   /* 8 data bits */
3126         outb(0x13, port + 4);   /* loop back mode */
3127         for (i = 0; i < 16; i++) {
3128                 n = inb(port + 5);
3129                 if ((n & 0x61) == 0x60)
3130                         break;
3131                 if ((n & 1) == 1)
3132                         (void)inb(port);
3133         }
3134         outb(0x00, port + 4);
3135 }
3136
3137 module_init(mxser_module_init);
3138 module_exit(mxser_module_exit);