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