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