err.no 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 #define MXSER_HIGHBAUD  1
  88 #define MXSER_HAS2      2
  89
  90 /* This is only for PCI */
  91 static const struct {
  92         int type;
  93         int tx_fifo;
  94         int rx_fifo;
  95         int xmit_fifo_size;
  96         int rx_high_water;
  97         int rx_trigger;
  98         int rx_low_water;
  99         long max_baud;
 100 } Gpci_uart_info[] = {
 101         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 102         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 103         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 104 };
 105 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 106
 107 struct mxser_cardinfo {
 108         unsigned int nports;
 109         char *name;
 110         unsigned int flags;
 111 };
 112
 113 static const struct mxser_cardinfo mxser_cards[] = {
 114         { 8, "C168 series", },                  /* C168-ISA */
 115         { 4, "C104 series", },                  /* C104-ISA */
 116         { 4, "CI-104J series", },               /* CI104J */
 117         { 8, "C168H/PCI series", },             /* C168-PCI */
 118         { 4, "C104H/PCI series", },             /* C104-PCI */
 119         { 4, "C102 series", MXSER_HAS2 },       /* C102-ISA */
 120         { 4, "CI-132 series", MXSER_HAS2 },     /* CI132 */
 121         { 4, "CI-134 series", },                /* CI134 */
 122         { 2, "CP-132 series", },                /* CP132 */
 123         { 4, "CP-114 series", },                /* CP114 */
 124         { 4, "CT-114 series", },                /* CT114 */
 125         { 2, "CP-102 series", MXSER_HIGHBAUD }, /* CP102 */
 126         { 4, "CP-104U series", },               /* CP104U */
 127         { 8, "CP-168U series", },               /* CP168U */
 128         { 2, "CP-132U series", },               /* CP132U */
 129         { 4, "CP-134U series", },               /* CP134U */
 130         { 4, "CP-104JU series", },              /* CP104JU */
 131         { 8, "Moxa UC7000 Serial", },           /* RC7000 */
 132         { 8, "CP-118U series", },               /* CP118U */
 133         { 2, "CP-102UL series", },              /* CP102UL */
 134         { 2, "CP-102U series", },               /* CP102U */
 135         { 8, "CP-118EL series", },              /* CP118EL */
 136         { 8, "CP-168EL series", },              /* CP168EL */
 137         { 4, "CP-104EL series", }               /* CP104EL */
 138 };
 139
 140 /* driver_data correspond to the lines in the structure above
 141    see also ISA probe function before you change something */
 142 static struct pci_device_id mxser_pcibrds[] = {
 143         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C168),
 144                 .driver_data = 3 },
 145         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C104),
 146                 .driver_data = 4 },
 147         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132),
 148                 .driver_data = 8 },
 149         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP114),
 150                 .driver_data = 9 },
 151         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CT114),
 152                 .driver_data = 10 },
 153         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102),
 154                 .driver_data = 11 },
 155         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104U),
 156                 .driver_data = 12 },
 157         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168U),
 158                 .driver_data = 13 },
 159         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132U),
 160                 .driver_data = 14 },
 161         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP134U),
 162                 .driver_data = 15 },
 163         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104JU),
 164                 .driver_data = 16 },
 165         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_RC7000),
 166                 .driver_data = 17 },
 167         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118U),
 168                 .driver_data = 18 },
 169         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102UL),
 170                 .driver_data = 19 },
 171         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102U),
 172                 .driver_data = 20 },
 173         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118EL),
 174                 .driver_data = 21 },
 175         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168EL),
 176                 .driver_data = 22 },
 177         { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104EL),
 178                 .driver_data = 23 },
 179         { }
 180 };
 181 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 182
 183 static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 184 static int ttymajor = MXSERMAJOR;
 185 static int calloutmajor = MXSERCUMAJOR;
 186
 187 /* Variables for insmod */
 188
 189 MODULE_AUTHOR("Casper Yang");
 190 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 191 module_param_array(ioaddr, int, NULL, 0);
 192 module_param(ttymajor, int, 0);
 193 MODULE_LICENSE("GPL");
 194
 195 struct mxser_log {
 196         int tick;
 197         unsigned long rxcnt[MXSER_PORTS];
 198         unsigned long txcnt[MXSER_PORTS];
 199 };
 200
 201
 202 struct mxser_mon {
 203         unsigned long rxcnt;
 204         unsigned long txcnt;
 205         unsigned long up_rxcnt;
 206         unsigned long up_txcnt;
 207         int modem_status;
 208         unsigned char hold_reason;
 209 };
 210
 211 struct mxser_mon_ext {
 212         unsigned long rx_cnt[32];
 213         unsigned long tx_cnt[32];
 214         unsigned long up_rxcnt[32];
 215         unsigned long up_txcnt[32];
 216         int modem_status[32];
 217
 218         long baudrate[32];
 219         int databits[32];
 220         int stopbits[32];
 221         int parity[32];
 222         int flowctrl[32];
 223         int fifo[32];
 224         int iftype[32];
 225 };
 226
 227 struct mxser_board;
 228
 229 struct mxser_port {
 230         struct mxser_board *board;
 231         struct tty_struct *tty;
 232
 233         unsigned long ioaddr;
 234         unsigned long opmode_ioaddr;
 235         int max_baud;
 236
 237         int rx_high_water;
 238         int rx_trigger;         /* Rx fifo trigger level */
 239         int rx_low_water;
 240         int baud_base;          /* max. speed */
 241         long realbaud;
 242         int type;               /* UART type */
 243         int flags;              /* defined in tty.h */
 244         long session;           /* Session of opening process */
 245         long pgrp;              /* pgrp of opening process */
 246
 247         int x_char;             /* xon/xoff character */
 248         int IER;                /* Interrupt Enable Register */
 249         int MCR;                /* Modem control register */
 250
 251         unsigned char stop_rx;
 252         unsigned char ldisc_stop_rx;
 253
 254         int custom_divisor;
 255         int close_delay;
 256         unsigned short closing_wait;
 257         unsigned char err_shadow;
 258         unsigned long event;
 259
 260         int count;              /* # of fd on device */
 261         int blocked_open;       /* # of blocked opens */
 262         struct async_icount icount; /* kernel counters for 4 input interrupts */
 263         int timeout;
 264
 265         int read_status_mask;
 266         int ignore_status_mask;
 267         int xmit_fifo_size;
 268         unsigned char *xmit_buf;
 269         int xmit_head;
 270         int xmit_tail;
 271         int xmit_cnt;
 272
 273         struct termios normal_termios;
 274         struct termios callout_termios;
 275
 276         struct mxser_mon mon_data;
 277
 278         spinlock_t slock;
 279         struct work_struct tqueue;
 280         wait_queue_head_t open_wait;
 281         wait_queue_head_t close_wait;
 282         wait_queue_head_t delta_msr_wait;
 283 };
 284
 285 struct mxser_board {
 286         struct pci_dev *pdev; /* temporary (until pci probing) */
 287
 288         int irq;
 289         const struct mxser_cardinfo *info;
 290         unsigned long vector;
 291         unsigned long vector_mask;
 292
 293         int chip_flag;
 294         int uart_type;
 295
 296         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 297 };
 298
 299 struct mxser_mstatus {
 300         tcflag_t cflag;
 301         int cts;
 302         int dsr;
 303         int ri;
 304         int dcd;
 305 };
 306
 307 static struct mxser_mstatus GMStatus[MXSER_PORTS];
 308
 309 static int mxserBoardCAP[MXSER_BOARDS] = {
 310         0, 0, 0, 0
 311         /*  0x180, 0x280, 0x200, 0x320 */
 312 };
 313
 314 static struct mxser_board mxser_boards[MXSER_BOARDS];
 315 static struct tty_driver *mxvar_sdriver;
 316 static struct tty_struct *mxvar_tty[MXSER_PORTS + 1];
 317 static struct termios *mxvar_termios[MXSER_PORTS + 1];
 318 static struct termios *mxvar_termios_locked[MXSER_PORTS + 1];
 319 static struct mxser_log mxvar_log;
 320 static int mxvar_diagflag;
 321 static unsigned char mxser_msr[MXSER_PORTS + 1];
 322 static struct mxser_mon_ext mon_data_ext;
 323 static int mxser_set_baud_method[MXSER_PORTS + 1];
 324 static spinlock_t gm_lock;
 325
 326 static int CheckIsMoxaMust(int io)
 327 {
 328         u8 oldmcr, hwid;
 329         int i;
 330
 331         outb(0, io + UART_LCR);
 332         DISABLE_MOXA_MUST_ENCHANCE_MODE(io);
 333         oldmcr = inb(io + UART_MCR);
 334         outb(0, io + UART_MCR);
 335         SET_MOXA_MUST_XON1_VALUE(io, 0x11);
 336         if ((hwid = inb(io + UART_MCR)) != 0) {
 337                 outb(oldmcr, io + UART_MCR);
 338                 return MOXA_OTHER_UART;
 339         }
 340
 341         GET_MOXA_MUST_HARDWARE_ID(io, &hwid);
 342         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 343                 if (hwid == Gpci_uart_info[i].type)
 344                         return (int)hwid;
 345         }
 346         return MOXA_OTHER_UART;
 347 }
 348
 349 /* above is modified by Victor Yu. 08-15-2002 */
 350
 351 static void process_txrx_fifo(struct mxser_port *info)
 352 {
 353         int i;
 354
 355         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 356                 info->rx_trigger = 1;
 357                 info->rx_high_water = 1;
 358                 info->rx_low_water = 1;
 359                 info->xmit_fifo_size = 1;
 360         } else
 361                 for (i = 0; i < UART_INFO_NUM; i++)
 362                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 363                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 364                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 365                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 366                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 367                                 break;
 368                         }
 369 }
 370
 371 static void mxser_do_softint(void *private_)
 372 {
 373         struct mxser_port *info = private_;
 374         struct tty_struct *tty;
 375
 376         tty = info->tty;
 377
 378         if (test_and_clear_bit(MXSER_EVENT_TXLOW, &info->event))
 379                 tty_wakeup(tty);
 380         if (test_and_clear_bit(MXSER_EVENT_HANGUP, &info->event))
 381                 tty_hangup(tty);
 382 }
 383
 384 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 385 {
 386         unsigned char status = 0;
 387
 388         status = inb(baseaddr + UART_MSR);
 389
 390         mxser_msr[port] &= 0x0F;
 391         mxser_msr[port] |= status;
 392         status = mxser_msr[port];
 393         if (mode)
 394                 mxser_msr[port] = 0;
 395
 396         return status;
 397 }
 398
 399 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 400                 struct mxser_port *port)
 401 {
 402         DECLARE_WAITQUEUE(wait, current);
 403         int retval;
 404         int do_clocal = 0;
 405         unsigned long flags;
 406
 407         /*
 408          * If non-blocking mode is set, or the port is not enabled,
 409          * then make the check up front and then exit.
 410          */
 411         if ((filp->f_flags & O_NONBLOCK) ||
 412                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 413                 port->flags |= ASYNC_NORMAL_ACTIVE;
 414                 return 0;
 415         }
 416
 417         if (tty->termios->c_cflag & CLOCAL)
 418                 do_clocal = 1;
 419
 420         /*
 421          * Block waiting for the carrier detect and the line to become
 422          * free (i.e., not in use by the callout).  While we are in
 423          * this loop, port->count is dropped by one, so that
 424          * mxser_close() knows when to free things.  We restore it upon
 425          * exit, either normal or abnormal.
 426          */
 427         retval = 0;
 428         add_wait_queue(&port->open_wait, &wait);
 429
 430         spin_lock_irqsave(&port->slock, flags);
 431         if (!tty_hung_up_p(filp))
 432                 port->count--;
 433         spin_unlock_irqrestore(&port->slock, flags);
 434         port->blocked_open++;
 435         while (1) {
 436                 spin_lock_irqsave(&port->slock, flags);
 437                 outb(inb(port->ioaddr + UART_MCR) |
 438                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 439                 spin_unlock_irqrestore(&port->slock, flags);
 440                 set_current_state(TASK_INTERRUPTIBLE);
 441                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
 442                         if (port->flags & ASYNC_HUP_NOTIFY)
 443                                 retval = -EAGAIN;
 444                         else
 445                                 retval = -ERESTARTSYS;
 446                         break;
 447                 }
 448                 if (!(port->flags & ASYNC_CLOSING) &&
 449                                 (do_clocal ||
 450                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 451                         break;
 452                 if (signal_pending(current)) {
 453                         retval = -ERESTARTSYS;
 454                         break;
 455                 }
 456                 schedule();
 457         }
 458         set_current_state(TASK_RUNNING);
 459         remove_wait_queue(&port->open_wait, &wait);
 460         if (!tty_hung_up_p(filp))
 461                 port->count++;
 462         port->blocked_open--;
 463         if (retval)
 464                 return retval;
 465         port->flags |= ASYNC_NORMAL_ACTIVE;
 466         return 0;
 467 }
 468
 469 static int mxser_set_baud(struct mxser_port *info, long newspd)
 470 {
 471         int quot = 0;
 472         unsigned char cval;
 473         int ret = 0;
 474         unsigned long flags;
 475
 476         if (!info->tty || !info->tty->termios)
 477                 return ret;
 478
 479         if (!(info->ioaddr))
 480                 return ret;
 481
 482         if (newspd > info->max_baud)
 483                 return 0;
 484
 485         info->realbaud = newspd;
 486         if (newspd == 134) {
 487                 quot = (2 * info->baud_base / 269);
 488         } else if (newspd) {
 489                 quot = info->baud_base / newspd;
 490                 if (quot == 0)
 491                         quot = 1;
 492         } else {
 493                 quot = 0;
 494         }
 495
 496         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 497         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 498
 499         if (quot) {
 500                 spin_lock_irqsave(&info->slock, flags);
 501                 info->MCR |= UART_MCR_DTR;
 502                 outb(info->MCR, info->ioaddr + UART_MCR);
 503                 spin_unlock_irqrestore(&info->slock, flags);
 504         } else {
 505                 spin_lock_irqsave(&info->slock, flags);
 506                 info->MCR &= ~UART_MCR_DTR;
 507                 outb(info->MCR, info->ioaddr + UART_MCR);
 508                 spin_unlock_irqrestore(&info->slock, flags);
 509                 return ret;
 510         }
 511
 512         cval = inb(info->ioaddr + UART_LCR);
 513
 514         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 515
 516         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 517         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 518         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 519
 520
 521         return ret;
 522 }
 523
 524 /*
 525  * This routine is called to set the UART divisor registers to match
 526  * the specified baud rate for a serial port.
 527  */
 528 static int mxser_change_speed(struct mxser_port *info,
 529                 struct termios *old_termios)
 530 {
 531         unsigned cflag, cval, fcr;
 532         int ret = 0;
 533         unsigned char status;
 534         long baud;
 535         unsigned long flags;
 536
 537         if (!info->tty || !info->tty->termios)
 538                 return ret;
 539         cflag = info->tty->termios->c_cflag;
 540         if (!(info->ioaddr))
 541                 return ret;
 542
 543         if (mxser_set_baud_method[info->tty->index] == 0) {
 544                 baud = tty_get_baud_rate(info->tty);
 545                 mxser_set_baud(info, baud);
 546         }
 547
 548         /* byte size and parity */
 549         switch (cflag & CSIZE) {
 550         case CS5:
 551                 cval = 0x00;
 552                 break;
 553         case CS6:
 554                 cval = 0x01;
 555                 break;
 556         case CS7:
 557                 cval = 0x02;
 558                 break;
 559         case CS8:
 560                 cval = 0x03;
 561                 break;
 562         default:
 563                 cval = 0x00;
 564                 break;          /* too keep GCC shut... */
 565         }
 566         if (cflag & CSTOPB)
 567                 cval |= 0x04;
 568         if (cflag & PARENB)
 569                 cval |= UART_LCR_PARITY;
 570         if (!(cflag & PARODD))
 571                 cval |= UART_LCR_EPAR;
 572         if (cflag & CMSPAR)
 573                 cval |= UART_LCR_SPAR;
 574
 575         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 576                 if (info->board->chip_flag) {
 577                         fcr = UART_FCR_ENABLE_FIFO;
 578                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 579                         SET_MOXA_MUST_FIFO_VALUE(info);
 580                 } else
 581                         fcr = 0;
 582         } else {
 583                 fcr = UART_FCR_ENABLE_FIFO;
 584                 /* following add by Victor Yu. 08-30-2002 */
 585                 if (info->board->chip_flag) {
 586                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 587                         SET_MOXA_MUST_FIFO_VALUE(info);
 588                 } else {
 589                         /* above add by Victor Yu. 08-30-2002 */
 590                         switch (info->rx_trigger) {
 591                         case 1:
 592                                 fcr |= UART_FCR_TRIGGER_1;
 593                                 break;
 594                         case 4:
 595                                 fcr |= UART_FCR_TRIGGER_4;
 596                                 break;
 597                         case 8:
 598                                 fcr |= UART_FCR_TRIGGER_8;
 599                                 break;
 600                         default:
 601                                 fcr |= UART_FCR_TRIGGER_14;
 602                                 break;
 603                         }
 604                 }
 605         }
 606
 607         /* CTS flow control flag and modem status interrupts */
 608         info->IER &= ~UART_IER_MSI;
 609         info->MCR &= ~UART_MCR_AFE;
 610         if (cflag & CRTSCTS) {
 611                 info->flags |= ASYNC_CTS_FLOW;
 612                 info->IER |= UART_IER_MSI;
 613                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 614                         info->MCR |= UART_MCR_AFE;
 615 /*                      status = mxser_get_msr(info->ioaddr, 0, info->port); */
 616 /*
 617         save_flags(flags);
 618         cli();
 619         status = inb(baseaddr + UART_MSR);
 620         restore_flags(flags);
 621 */
 622                         /* mxser_check_modem_status(info, status); */
 623                 } else {
 624 /*                      status = mxser_get_msr(info->ioaddr, 0, info->port); */
 625                         /* MX_LOCK(&info->slock); */
 626                         status = inb(info->ioaddr + UART_MSR);
 627                         /* MX_UNLOCK(&info->slock); */
 628                         if (info->tty->hw_stopped) {
 629                                 if (status & UART_MSR_CTS) {
 630                                         info->tty->hw_stopped = 0;
 631                                         if (info->type != PORT_16550A &&
 632                                                         !info->board->chip_flag) {
 633                                                 outb(info->IER & ~UART_IER_THRI,
 634                                                         info->ioaddr +
 635                                                         UART_IER);
 636                                                 info->IER |= UART_IER_THRI;
 637                                                 outb(info->IER, info->ioaddr +
 638                                                                 UART_IER);
 639                                         }
 640                                         set_bit(MXSER_EVENT_TXLOW, &info->event);
 641                                         schedule_work(&info->tqueue);                           }
 642                         } else {
 643                                 if (!(status & UART_MSR_CTS)) {
 644                                         info->tty->hw_stopped = 1;
 645                                         if ((info->type != PORT_16550A) &&
 646                                                         (!info->board->chip_flag)) {
 647                                                 info->IER &= ~UART_IER_THRI;
 648                                                 outb(info->IER, info->ioaddr +
 649                                                                 UART_IER);
 650                                         }
 651                                 }
 652                         }
 653                 }
 654         } else {
 655                 info->flags &= ~ASYNC_CTS_FLOW;
 656         }
 657         outb(info->MCR, info->ioaddr + UART_MCR);
 658         if (cflag & CLOCAL) {
 659                 info->flags &= ~ASYNC_CHECK_CD;
 660         } else {
 661                 info->flags |= ASYNC_CHECK_CD;
 662                 info->IER |= UART_IER_MSI;
 663         }
 664         outb(info->IER, info->ioaddr + UART_IER);
 665
 666         /*
 667          * Set up parity check flag
 668          */
 669         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 670         if (I_INPCK(info->tty))
 671                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 672         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
 673                 info->read_status_mask |= UART_LSR_BI;
 674
 675         info->ignore_status_mask = 0;
 676
 677         if (I_IGNBRK(info->tty)) {
 678                 info->ignore_status_mask |= UART_LSR_BI;
 679                 info->read_status_mask |= UART_LSR_BI;
 680                 /*
 681                  * If we're ignore parity and break indicators, ignore
 682                  * overruns too.  (For real raw support).
 683                  */
 684                 if (I_IGNPAR(info->tty)) {
 685                         info->ignore_status_mask |=
 686                                                 UART_LSR_OE |
 687                                                 UART_LSR_PE |
 688                                                 UART_LSR_FE;
 689                         info->read_status_mask |=
 690                                                 UART_LSR_OE |
 691                                                 UART_LSR_PE |
 692                                                 UART_LSR_FE;
 693                 }
 694         }
 695         /* following add by Victor Yu. 09-02-2002 */
 696         if (info->board->chip_flag) {
 697                 spin_lock_irqsave(&info->slock, flags);
 698                 SET_MOXA_MUST_XON1_VALUE(info->ioaddr, START_CHAR(info->tty));
 699                 SET_MOXA_MUST_XOFF1_VALUE(info->ioaddr, STOP_CHAR(info->tty));
 700                 if (I_IXON(info->tty)) {
 701                         ENABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 702                 } else {
 703                         DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 704                 }
 705                 if (I_IXOFF(info->tty)) {
 706                         ENABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 707                 } else {
 708                         DISABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 709                 }
 710                 /*
 711                    if ( I_IXANY(info->tty) ) {
 712                    info->MCR |= MOXA_MUST_MCR_XON_ANY;
 713                    ENABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->ioaddr);
 714                    } else {
 715                    info->MCR &= ~MOXA_MUST_MCR_XON_ANY;
 716                    DISABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->ioaddr);
 717                    }
 718                  */
 719                 spin_unlock_irqrestore(&info->slock, flags);
 720         }
 721         /* above add by Victor Yu. 09-02-2002 */
 722
 723
 724         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 725         outb(cval, info->ioaddr + UART_LCR);
 726
 727         return ret;
 728 }
 729
 730 static void mxser_check_modem_status(struct mxser_port *port, int status)
 731 {
 732         /* update input line counters */
 733         if (status & UART_MSR_TERI)
 734                 port->icount.rng++;
 735         if (status & UART_MSR_DDSR)
 736                 port->icount.dsr++;
 737         if (status & UART_MSR_DDCD)
 738                 port->icount.dcd++;
 739         if (status & UART_MSR_DCTS)
 740                 port->icount.cts++;
 741         port->mon_data.modem_status = status;
 742         wake_up_interruptible(&port->delta_msr_wait);
 743
 744         if ((port->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 745                 if (status & UART_MSR_DCD)
 746                         wake_up_interruptible(&port->open_wait);
 747                 schedule_work(&port->tqueue);
 748         }
 749
 750         if (port->flags & ASYNC_CTS_FLOW) {
 751                 if (port->tty->hw_stopped) {
 752                         if (status & UART_MSR_CTS) {
 753                                 port->tty->hw_stopped = 0;
 754
 755                                 if ((port->type != PORT_16550A) &&
 756                                                 (!port->board->chip_flag)) {
 757                                         outb(port->IER & ~UART_IER_THRI,
 758                                                 port->ioaddr + UART_IER);
 759                                         port->IER |= UART_IER_THRI;
 760                                         outb(port->IER, port->ioaddr +
 761                                                         UART_IER);
 762                                 }
 763                                 set_bit(MXSER_EVENT_TXLOW, &port->event);
 764                                 schedule_work(&port->tqueue);
 765                         }
 766                 } else {
 767                         if (!(status & UART_MSR_CTS)) {
 768                                 port->tty->hw_stopped = 1;
 769                                 if (port->type != PORT_16550A &&
 770                                                 !port->board->chip_flag) {
 771                                         port->IER &= ~UART_IER_THRI;
 772                                         outb(port->IER, port->ioaddr +
 773                                                         UART_IER);
 774                                 }
 775                         }
 776                 }
 777         }
 778 }
 779
 780 static int mxser_startup(struct mxser_port *info)
 781 {
 782         unsigned long page;
 783         unsigned long flags;
 784
 785         page = __get_free_page(GFP_KERNEL);
 786         if (!page)
 787                 return -ENOMEM;
 788
 789         spin_lock_irqsave(&info->slock, flags);
 790
 791         if (info->flags & ASYNC_INITIALIZED) {
 792                 free_page(page);
 793                 spin_unlock_irqrestore(&info->slock, flags);
 794                 return 0;
 795         }
 796
 797         if (!info->ioaddr || !info->type) {
 798                 if (info->tty)
 799                         set_bit(TTY_IO_ERROR, &info->tty->flags);
 800                 free_page(page);
 801                 spin_unlock_irqrestore(&info->slock, flags);
 802                 return 0;
 803         }
 804         if (info->xmit_buf)
 805                 free_page(page);
 806         else
 807                 info->xmit_buf = (unsigned char *) page;
 808
 809         /*
 810          * Clear the FIFO buffers and disable them
 811          * (they will be reenabled in mxser_change_speed())
 812          */
 813         if (info->board->chip_flag)
 814                 outb((UART_FCR_CLEAR_RCVR |
 815                         UART_FCR_CLEAR_XMIT |
 816                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 817         else
 818                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 819                         info->ioaddr + UART_FCR);
 820
 821         /*
 822          * At this point there's no way the LSR could still be 0xFF;
 823          * if it is, then bail out, because there's likely no UART
 824          * here.
 825          */
 826         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 827                 spin_unlock_irqrestore(&info->slock, flags);
 828                 if (capable(CAP_SYS_ADMIN)) {
 829                         if (info->tty)
 830                                 set_bit(TTY_IO_ERROR, &info->tty->flags);
 831                         return 0;
 832                 } else
 833                         return -ENODEV;
 834         }
 835
 836         /*
 837          * Clear the interrupt registers.
 838          */
 839         (void) inb(info->ioaddr + UART_LSR);
 840         (void) inb(info->ioaddr + UART_RX);
 841         (void) inb(info->ioaddr + UART_IIR);
 842         (void) inb(info->ioaddr + UART_MSR);
 843
 844         /*
 845          * Now, initialize the UART
 846          */
 847         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 848         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 849         outb(info->MCR, info->ioaddr + UART_MCR);
 850
 851         /*
 852          * Finally, enable interrupts
 853          */
 854         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 855         /* info->IER = UART_IER_RLSI | UART_IER_RDI; */
 856
 857         /* following add by Victor Yu. 08-30-2002 */
 858         if (info->board->chip_flag)
 859                 info->IER |= MOXA_MUST_IER_EGDAI;
 860         /* above add by Victor Yu. 08-30-2002 */
 861         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 862
 863         /*
 864          * And clear the interrupt registers again for luck.
 865          */
 866         (void) inb(info->ioaddr + UART_LSR);
 867         (void) inb(info->ioaddr + UART_RX);
 868         (void) inb(info->ioaddr + UART_IIR);
 869         (void) inb(info->ioaddr + UART_MSR);
 870
 871         if (info->tty)
 872                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
 873         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 874
 875         /*
 876          * and set the speed of the serial port
 877          */
 878         spin_unlock_irqrestore(&info->slock, flags);
 879         mxser_change_speed(info, NULL);
 880
 881         info->flags |= ASYNC_INITIALIZED;
 882         return 0;
 883 }
 884
 885 /*
 886  * This routine will shutdown a serial port; interrupts maybe disabled, and
 887  * DTR is dropped if the hangup on close termio flag is on.
 888  */
 889 static void mxser_shutdown(struct mxser_port *info)
 890 {
 891         unsigned long flags;
 892
 893         if (!(info->flags & ASYNC_INITIALIZED))
 894                 return;
 895
 896         spin_lock_irqsave(&info->slock, flags);
 897
 898         /*
 899          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 900          * here so the queue might never be waken up
 901          */
 902         wake_up_interruptible(&info->delta_msr_wait);
 903
 904         /*
 905          * Free the IRQ, if necessary
 906          */
 907         if (info->xmit_buf) {
 908                 free_page((unsigned long) info->xmit_buf);
 909                 info->xmit_buf = NULL;
 910         }
 911
 912         info->IER = 0;
 913         outb(0x00, info->ioaddr + UART_IER);
 914
 915         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
 916                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
 917         outb(info->MCR, info->ioaddr + UART_MCR);
 918
 919         /* clear Rx/Tx FIFO's */
 920         /* following add by Victor Yu. 08-30-2002 */
 921         if (info->board->chip_flag)
 922                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 923                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 924                                 info->ioaddr + UART_FCR);
 925         else
 926                 /* above add by Victor Yu. 08-30-2002 */
 927                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 928                         info->ioaddr + UART_FCR);
 929
 930         /* read data port to reset things */
 931         (void) inb(info->ioaddr + UART_RX);
 932
 933         if (info->tty)
 934                 set_bit(TTY_IO_ERROR, &info->tty->flags);
 935
 936         info->flags &= ~ASYNC_INITIALIZED;
 937
 938         /* following add by Victor Yu. 09-23-2002 */
 939         if (info->board->chip_flag)
 940                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 941         /* above add by Victor Yu. 09-23-2002 */
 942
 943         spin_unlock_irqrestore(&info->slock, flags);
 944 }
 945
 946 /*
 947  * This routine is called whenever a serial port is opened.  It
 948  * enables interrupts for a serial port, linking in its async structure into
 949  * the IRQ chain.   It also performs the serial-specific
 950  * initialization for the tty structure.
 951  */
 952 static int mxser_open(struct tty_struct *tty, struct file *filp)
 953 {
 954         struct mxser_port *info;
 955         int retval, line;
 956
 957         /* initialize driver_data in case something fails */
 958         tty->driver_data = NULL;
 959
 960         line = tty->index;
 961         if (line == MXSER_PORTS)
 962                 return 0;
 963         if (line < 0 || line > MXSER_PORTS)
 964                 return -ENODEV;
 965         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
 966         if (!info->ioaddr)
 967                 return -ENODEV;
 968
 969         tty->driver_data = info;
 970         info->tty = tty;
 971         /*
 972          * Start up serial port
 973          */
 974         info->count++;
 975         retval = mxser_startup(info);
 976         if (retval)
 977                 return retval;
 978
 979         retval = mxser_block_til_ready(tty, filp, info);
 980         if (retval)
 981                 return retval;
 982
 983         if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
 984                 if (tty->driver->subtype == SERIAL_TYPE_NORMAL)
 985                         *tty->termios = info->normal_termios;
 986                 else
 987                         *tty->termios = info->callout_termios;
 988                 mxser_change_speed(info, NULL);
 989         }
 990
 991         info->session = process_session(current);
 992         info->pgrp = process_group(current);
 993
 994         /*
 995         status = mxser_get_msr(info->base, 0, info->port);
 996         mxser_check_modem_status(info, status);
 997         */
 998
 999 /* unmark here for very high baud rate (ex. 921600 bps) used */
1000         tty->low_latency = 1;
1001         return 0;
1002 }
1003
1004 /*
1005  * This routine is called when the serial port gets closed.  First, we
1006  * wait for the last remaining data to be sent.  Then, we unlink its
1007  * async structure from the interrupt chain if necessary, and we free
1008  * that IRQ if nothing is left in the chain.
1009  */
1010 static void mxser_close(struct tty_struct *tty, struct file *filp)
1011 {
1012         struct mxser_port *info = tty->driver_data;
1013
1014         unsigned long timeout;
1015         unsigned long flags;
1016
1017         if (tty->index == MXSER_PORTS)
1018                 return;
1019         if (!info)
1020                 return;
1021
1022         spin_lock_irqsave(&info->slock, flags);
1023
1024         if (tty_hung_up_p(filp)) {
1025                 spin_unlock_irqrestore(&info->slock, flags);
1026                 return;
1027         }
1028         if ((tty->count == 1) && (info->count != 1)) {
1029                 /*
1030                  * Uh, oh.  tty->count is 1, which means that the tty
1031                  * structure will be freed.  Info->count should always
1032                  * be one in these conditions.  If it's greater than
1033                  * one, we've got real problems, since it means the
1034                  * serial port won't be shutdown.
1035                  */
1036                 printk(KERN_ERR "mxser_close: bad serial port count; "
1037                         "tty->count is 1, info->count is %d\n", info->count);
1038                 info->count = 1;
1039         }
1040         if (--info->count < 0) {
1041                 printk(KERN_ERR "mxser_close: bad serial port count for "
1042                         "ttys%d: %d\n", tty->index, info->count);
1043                 info->count = 0;
1044         }
1045         if (info->count) {
1046                 spin_unlock_irqrestore(&info->slock, flags);
1047                 return;
1048         }
1049         info->flags |= ASYNC_CLOSING;
1050         spin_unlock_irqrestore(&info->slock, flags);
1051         /*
1052          * Save the termios structure, since this port may have
1053          * separate termios for callout and dialin.
1054          */
1055         if (info->flags & ASYNC_NORMAL_ACTIVE)
1056                 info->normal_termios = *tty->termios;
1057         /*
1058          * Now we wait for the transmit buffer to clear; and we notify
1059          * the line discipline to only process XON/XOFF characters.
1060          */
1061         tty->closing = 1;
1062         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1063                 tty_wait_until_sent(tty, info->closing_wait);
1064         /*
1065          * At this point we stop accepting input.  To do this, we
1066          * disable the receive line status interrupts, and tell the
1067          * interrupt driver to stop checking the data ready bit in the
1068          * line status register.
1069          */
1070         info->IER &= ~UART_IER_RLSI;
1071         if (info->board->chip_flag)
1072                 info->IER &= ~MOXA_MUST_RECV_ISR;
1073 /* by William
1074         info->read_status_mask &= ~UART_LSR_DR;
1075 */
1076         if (info->flags & ASYNC_INITIALIZED) {
1077                 outb(info->IER, info->ioaddr + UART_IER);
1078                 /*
1079                  * Before we drop DTR, make sure the UART transmitter
1080                  * has completely drained; this is especially
1081                  * important if there is a transmit FIFO!
1082                  */
1083                 timeout = jiffies + HZ;
1084                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1085                         schedule_timeout_interruptible(5);
1086                         if (time_after(jiffies, timeout))
1087                                 break;
1088                 }
1089         }
1090         mxser_shutdown(info);
1091
1092         if (tty->driver->flush_buffer)
1093                 tty->driver->flush_buffer(tty);
1094
1095         tty_ldisc_flush(tty);
1096
1097         tty->closing = 0;
1098         info->event = 0;
1099         info->tty = NULL;
1100         if (info->blocked_open) {
1101                 if (info->close_delay)
1102                         schedule_timeout_interruptible(info->close_delay);
1103                 wake_up_interruptible(&info->open_wait);
1104         }
1105
1106         info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1107         wake_up_interruptible(&info->close_wait);
1108
1109 }
1110
1111 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1112 {
1113         int c, total = 0;
1114         struct mxser_port *info = tty->driver_data;
1115         unsigned long flags;
1116
1117         if (!info->xmit_buf)
1118                 return 0;
1119
1120         while (1) {
1121                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1122                                           SERIAL_XMIT_SIZE - info->xmit_head));
1123                 if (c <= 0)
1124                         break;
1125
1126                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1127                 spin_lock_irqsave(&info->slock, flags);
1128                 info->xmit_head = (info->xmit_head + c) &
1129                                   (SERIAL_XMIT_SIZE - 1);
1130                 info->xmit_cnt += c;
1131                 spin_unlock_irqrestore(&info->slock, flags);
1132
1133                 buf += c;
1134                 count -= c;
1135                 total += c;
1136         }
1137
1138         if (info->xmit_cnt && !tty->stopped
1139                         /*&& !(info->IER & UART_IER_THRI)*/) {
1140                 if (!tty->hw_stopped ||
1141                                 (info->type == PORT_16550A) ||
1142                                 (info->board->chip_flag)) {
1143                         spin_lock_irqsave(&info->slock, flags);
1144                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1145                                         UART_IER);
1146                         info->IER |= UART_IER_THRI;
1147                         outb(info->IER, info->ioaddr + UART_IER);
1148                         spin_unlock_irqrestore(&info->slock, flags);
1149                 }
1150         }
1151         return total;
1152 }
1153
1154 static void mxser_put_char(struct tty_struct *tty, unsigned char ch)
1155 {
1156         struct mxser_port *info = tty->driver_data;
1157         unsigned long flags;
1158
1159         if (!info->xmit_buf)
1160                 return;
1161
1162         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1163                 return;
1164
1165         spin_lock_irqsave(&info->slock, flags);
1166         info->xmit_buf[info->xmit_head++] = ch;
1167         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1168         info->xmit_cnt++;
1169         spin_unlock_irqrestore(&info->slock, flags);
1170         if (!tty->stopped /*&& !(info->IER & UART_IER_THRI)*/) {
1171                 if (!tty->hw_stopped ||
1172                                 (info->type == PORT_16550A) ||
1173                                 info->board->chip_flag) {
1174                         spin_lock_irqsave(&info->slock, flags);
1175                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1176                         info->IER |= UART_IER_THRI;
1177                         outb(info->IER, info->ioaddr + UART_IER);
1178                         spin_unlock_irqrestore(&info->slock, flags);
1179                 }
1180         }
1181 }
1182
1183
1184 static void mxser_flush_chars(struct tty_struct *tty)
1185 {
1186         struct mxser_port *info = tty->driver_data;
1187         unsigned long flags;
1188
1189         if (info->xmit_cnt <= 0 ||
1190                         tty->stopped ||
1191                         !info->xmit_buf ||
1192                         (tty->hw_stopped &&
1193                          (info->type != PORT_16550A) &&
1194                          (!info->board->chip_flag)
1195                         ))
1196                 return;
1197
1198         spin_lock_irqsave(&info->slock, flags);
1199
1200         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1201         info->IER |= UART_IER_THRI;
1202         outb(info->IER, info->ioaddr + UART_IER);
1203
1204         spin_unlock_irqrestore(&info->slock, flags);
1205 }
1206
1207 static int mxser_write_room(struct tty_struct *tty)
1208 {
1209         struct mxser_port *info = tty->driver_data;
1210         int ret;
1211
1212         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1213         if (ret < 0)
1214                 ret = 0;
1215         return ret;
1216 }
1217
1218 static int mxser_chars_in_buffer(struct tty_struct *tty)
1219 {
1220         struct mxser_port *info = tty->driver_data;
1221         int len = info->xmit_cnt;
1222
1223         if (!(inb(info->ioaddr + UART_LSR) & UART_LSR_THRE))
1224                 len++;
1225
1226         return len;
1227 }
1228
1229 static void mxser_flush_buffer(struct tty_struct *tty)
1230 {
1231         struct mxser_port *info = tty->driver_data;
1232         char fcr;
1233         unsigned long flags;
1234
1235
1236         spin_lock_irqsave(&info->slock, flags);
1237         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1238
1239         /* below added by shinhay */
1240         fcr = inb(info->ioaddr + UART_FCR);
1241         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1242                 info->ioaddr + UART_FCR);
1243         outb(fcr, info->ioaddr + UART_FCR);
1244
1245         spin_unlock_irqrestore(&info->slock, flags);
1246         /* above added by shinhay */
1247
1248         tty_wakeup(tty);
1249 }
1250
1251 /*
1252  * ------------------------------------------------------------
1253  * friends of mxser_ioctl()
1254  * ------------------------------------------------------------
1255  */
1256 static int mxser_get_serial_info(struct mxser_port *info,
1257                 struct serial_struct __user *retinfo)
1258 {
1259         struct serial_struct tmp;
1260
1261         if (!retinfo)
1262                 return -EFAULT;
1263         memset(&tmp, 0, sizeof(tmp));
1264         tmp.type = info->type;
1265         tmp.line = info->tty->index;
1266         tmp.port = info->ioaddr;
1267         tmp.irq = info->board->irq;
1268         tmp.flags = info->flags;
1269         tmp.baud_base = info->baud_base;
1270         tmp.close_delay = info->close_delay;
1271         tmp.closing_wait = info->closing_wait;
1272         tmp.custom_divisor = info->custom_divisor;
1273         tmp.hub6 = 0;
1274         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1275                 return -EFAULT;
1276         return 0;
1277 }
1278
1279 static int mxser_set_serial_info(struct mxser_port *info,
1280                 struct serial_struct __user *new_info)
1281 {
1282         struct serial_struct new_serial;
1283         unsigned int flags;
1284         int retval = 0;
1285
1286         if (!new_info || !info->ioaddr)
1287                 return -EFAULT;
1288         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1289                 return -EFAULT;
1290
1291         if ((new_serial.irq != info->board->irq) ||
1292                         (new_serial.port != info->ioaddr) ||
1293                         (new_serial.custom_divisor != info->custom_divisor) ||
1294                         (new_serial.baud_base != info->baud_base))
1295                 return -EPERM;
1296
1297         flags = info->flags & ASYNC_SPD_MASK;
1298
1299         if (!capable(CAP_SYS_ADMIN)) {
1300                 if ((new_serial.baud_base != info->baud_base) ||
1301                                 (new_serial.close_delay != info->close_delay) ||
1302                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK)))
1303                         return -EPERM;
1304                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1305                                 (new_serial.flags & ASYNC_USR_MASK));
1306         } else {
1307                 /*
1308                  * OK, past this point, all the error checking has been done.
1309                  * At this point, we start making changes.....
1310                  */
1311                 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1312                                 (new_serial.flags & ASYNC_FLAGS));
1313                 info->close_delay = new_serial.close_delay * HZ / 100;
1314                 info->closing_wait = new_serial.closing_wait * HZ / 100;
1315                 info->tty->low_latency =
1316                                 (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1317                 info->tty->low_latency = 0;     /* (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; */
1318         }
1319
1320         /* added by casper, 3/17/2000, for mouse */
1321         info->type = new_serial.type;
1322
1323         process_txrx_fifo(info);
1324
1325         if (info->flags & ASYNC_INITIALIZED) {
1326                 if (flags != (info->flags & ASYNC_SPD_MASK))
1327                         mxser_change_speed(info, NULL);
1328         } else
1329                 retval = mxser_startup(info);
1330
1331         return retval;
1332 }
1333
1334 /*
1335  * mxser_get_lsr_info - get line status register info
1336  *
1337  * Purpose: Let user call ioctl() to get info when the UART physically
1338  *          is emptied.  On bus types like RS485, the transmitter must
1339  *          release the bus after transmitting. This must be done when
1340  *          the transmit shift register is empty, not be done when the
1341  *          transmit holding register is empty.  This functionality
1342  *          allows an RS485 driver to be written in user space.
1343  */
1344 static int mxser_get_lsr_info(struct mxser_port *info,
1345                 unsigned int __user *value)
1346 {
1347         unsigned char status;
1348         unsigned int result;
1349         unsigned long flags;
1350
1351         spin_lock_irqsave(&info->slock, flags);
1352         status = inb(info->ioaddr + UART_LSR);
1353         spin_unlock_irqrestore(&info->slock, flags);
1354         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1355         return put_user(result, value);
1356 }
1357
1358 /*
1359  * This routine sends a break character out the serial port.
1360  */
1361 static void mxser_send_break(struct mxser_port *info, int duration)
1362 {
1363         unsigned long flags;
1364
1365         if (!info->ioaddr)
1366                 return;
1367         set_current_state(TASK_INTERRUPTIBLE);
1368         spin_lock_irqsave(&info->slock, flags);
1369         outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
1370                 info->ioaddr + UART_LCR);
1371         spin_unlock_irqrestore(&info->slock, flags);
1372         schedule_timeout(duration);
1373         spin_lock_irqsave(&info->slock, flags);
1374         outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
1375                 info->ioaddr + UART_LCR);
1376         spin_unlock_irqrestore(&info->slock, flags);
1377 }
1378
1379 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1380 {
1381         struct mxser_port *info = tty->driver_data;
1382         unsigned char control, status;
1383         unsigned long flags;
1384
1385
1386         if (tty->index == MXSER_PORTS)
1387                 return -ENOIOCTLCMD;
1388         if (test_bit(TTY_IO_ERROR, &tty->flags))
1389                 return -EIO;
1390
1391         control = info->MCR;
1392
1393         spin_lock_irqsave(&info->slock, flags);
1394         status = inb(info->ioaddr + UART_MSR);
1395         if (status & UART_MSR_ANY_DELTA)
1396                 mxser_check_modem_status(info, status);
1397         spin_unlock_irqrestore(&info->slock, flags);
1398         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1399                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1400                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1401                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1402                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1403                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1404 }
1405
1406 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1407                 unsigned int set, unsigned int clear)
1408 {
1409         struct mxser_port *info = tty->driver_data;
1410         unsigned long flags;
1411
1412
1413         if (tty->index == MXSER_PORTS)
1414                 return -ENOIOCTLCMD;
1415         if (test_bit(TTY_IO_ERROR, &tty->flags))
1416                 return -EIO;
1417
1418         spin_lock_irqsave(&info->slock, flags);
1419
1420         if (set & TIOCM_RTS)
1421                 info->MCR |= UART_MCR_RTS;
1422         if (set & TIOCM_DTR)
1423                 info->MCR |= UART_MCR_DTR;
1424
1425         if (clear & TIOCM_RTS)
1426                 info->MCR &= ~UART_MCR_RTS;
1427         if (clear & TIOCM_DTR)
1428                 info->MCR &= ~UART_MCR_DTR;
1429
1430         outb(info->MCR, info->ioaddr + UART_MCR);
1431         spin_unlock_irqrestore(&info->slock, flags);
1432         return 0;
1433 }
1434
1435 static int mxser_program_mode(int port)
1436 {
1437         int id, i, j, n;
1438         /* unsigned long flags; */
1439
1440         spin_lock(&gm_lock);
1441         outb(0, port);
1442         outb(0, port);
1443         outb(0, port);
1444         (void)inb(port);
1445         (void)inb(port);
1446         outb(0, port);
1447         (void)inb(port);
1448         /* restore_flags(flags); */
1449         spin_unlock(&gm_lock);
1450
1451         id = inb(port + 1) & 0x1F;
1452         if ((id != C168_ASIC_ID) &&
1453                         (id != C104_ASIC_ID) &&
1454                         (id != C102_ASIC_ID) &&
1455                         (id != CI132_ASIC_ID) &&
1456                         (id != CI134_ASIC_ID) &&
1457                         (id != CI104J_ASIC_ID))
1458                 return -1;
1459         for (i = 0, j = 0; i < 4; i++) {
1460                 n = inb(port + 2);
1461                 if (n == 'M') {
1462                         j = 1;
1463                 } else if ((j == 1) && (n == 1)) {
1464                         j = 2;
1465                         break;
1466                 } else
1467                         j = 0;
1468         }
1469         if (j != 2)
1470                 id = -2;
1471         return id;
1472 }
1473
1474 static void mxser_normal_mode(int port)
1475 {
1476         int i, n;
1477
1478         outb(0xA5, port + 1);
1479         outb(0x80, port + 3);
1480         outb(12, port + 0);     /* 9600 bps */
1481         outb(0, port + 1);
1482         outb(0x03, port + 3);   /* 8 data bits */
1483         outb(0x13, port + 4);   /* loop back mode */
1484         for (i = 0; i < 16; i++) {
1485                 n = inb(port + 5);
1486                 if ((n & 0x61) == 0x60)
1487                         break;
1488                 if ((n & 1) == 1)
1489                         (void)inb(port);
1490         }
1491         outb(0x00, port + 4);
1492 }
1493
1494 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1495 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1496 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1497 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1498 #define EN_CCMD         0x000   /* Chip's command register     */
1499 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1500 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1501 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1502 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1503 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1504 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1505 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1506 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1507 static int mxser_read_register(int port, unsigned short *regs)
1508 {
1509         int i, k, value, id;
1510         unsigned int j;
1511
1512         id = mxser_program_mode(port);
1513         if (id < 0)
1514                 return id;
1515         for (i = 0; i < 14; i++) {
1516                 k = (i & 0x3F) | 0x180;
1517                 for (j = 0x100; j > 0; j >>= 1) {
1518                         outb(CHIP_CS, port);
1519                         if (k & j) {
1520                                 outb(CHIP_CS | CHIP_DO, port);
1521                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1522                         } else {
1523                                 outb(CHIP_CS, port);
1524                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1525                         }
1526                 }
1527                 (void)inb(port);
1528                 value = 0;
1529                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1530                         outb(CHIP_CS, port);
1531                         outb(CHIP_CS | CHIP_SK, port);
1532                         if (inb(port) & CHIP_DI)
1533                                 value |= j;
1534                 }
1535                 regs[i] = value;
1536                 outb(0, port);
1537         }
1538         mxser_normal_mode(port);
1539         return id;
1540 }
1541
1542 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1543 {
1544         struct mxser_port *port;
1545         int result, status;
1546         unsigned int i, j;
1547
1548         switch (cmd) {
1549         case MOXA_GET_CONF:
1550 /*              if (copy_to_user(argp, mxsercfg,
1551                                 sizeof(struct mxser_hwconf) * 4))
1552                         return -EFAULT;
1553                 return 0;*/
1554                 return -ENXIO;
1555         case MOXA_GET_MAJOR:
1556                 if (copy_to_user(argp, &ttymajor, sizeof(int)))
1557                         return -EFAULT;
1558                 return 0;
1559
1560         case MOXA_GET_CUMAJOR:
1561                 if (copy_to_user(argp, &calloutmajor, sizeof(int)))
1562                         return -EFAULT;
1563                 return 0;
1564
1565         case MOXA_CHKPORTENABLE:
1566                 result = 0;
1567
1568                 for (i = 0; i < MXSER_BOARDS; i++)
1569                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1570                                 if (mxser_boards[i].ports[j].ioaddr)
1571                                         result |= (1 << i);
1572
1573                 return put_user(result, (unsigned long __user *)argp);
1574         case MOXA_GETDATACOUNT:
1575                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1576                         return -EFAULT;
1577                 return 0;
1578         case MOXA_GETMSTATUS:
1579                 for (i = 0; i < MXSER_BOARDS; i++)
1580                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1581                                 port = &mxser_boards[i].ports[j];
1582
1583                                 GMStatus[i].ri = 0;
1584                                 if (!port->ioaddr) {
1585                                         GMStatus[i].dcd = 0;
1586                                         GMStatus[i].dsr = 0;
1587                                         GMStatus[i].cts = 0;
1588                                         continue;
1589                                 }
1590
1591                                 if (!port->tty || !port->tty->termios)
1592                                         GMStatus[i].cflag =
1593                                                 port->normal_termios.c_cflag;
1594                                 else
1595                                         GMStatus[i].cflag =
1596                                                 port->tty->termios->c_cflag;
1597
1598                                 status = inb(port->ioaddr + UART_MSR);
1599                                 if (status & 0x80 /*UART_MSR_DCD */ )
1600                                         GMStatus[i].dcd = 1;
1601                                 else
1602                                         GMStatus[i].dcd = 0;
1603
1604                                 if (status & 0x20 /*UART_MSR_DSR */ )
1605                                         GMStatus[i].dsr = 1;
1606                                 else
1607                                         GMStatus[i].dsr = 0;
1608
1609
1610                                 if (status & 0x10 /*UART_MSR_CTS */ )
1611                                         GMStatus[i].cts = 1;
1612                                 else
1613                                         GMStatus[i].cts = 0;
1614                         }
1615                 if (copy_to_user(argp, GMStatus,
1616                                 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1617                         return -EFAULT;
1618                 return 0;
1619         case MOXA_ASPP_MON_EXT: {
1620                 int status, p, shiftbit;
1621                 unsigned long opmode;
1622                 unsigned cflag, iflag;
1623
1624                 for (i = 0; i < MXSER_BOARDS; i++)
1625                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1626                                 port = &mxser_boards[i].ports[j];
1627                                 if (!port->ioaddr)
1628                                         continue;
1629
1630                                 status = mxser_get_msr(port->ioaddr, 0, i);
1631 /*                              mxser_check_modem_status(port, status); */
1632
1633                                 if (status & UART_MSR_TERI)
1634                                         port->icount.rng++;
1635                                 if (status & UART_MSR_DDSR)
1636                                         port->icount.dsr++;
1637                                 if (status & UART_MSR_DDCD)
1638                                         port->icount.dcd++;
1639                                 if (status & UART_MSR_DCTS)
1640                                         port->icount.cts++;
1641
1642                                 port->mon_data.modem_status = status;
1643                                 mon_data_ext.rx_cnt[i] = port->mon_data.rxcnt;
1644                                 mon_data_ext.tx_cnt[i] = port->mon_data.txcnt;
1645                                 mon_data_ext.up_rxcnt[i] =
1646                                         port->mon_data.up_rxcnt;
1647                                 mon_data_ext.up_txcnt[i] =
1648                                         port->mon_data.up_txcnt;
1649                                 mon_data_ext.modem_status[i] =
1650                                         port->mon_data.modem_status;
1651                                 mon_data_ext.baudrate[i] = port->realbaud;
1652
1653                                 if (!port->tty || !port->tty->termios) {
1654                                         cflag = port->normal_termios.c_cflag;
1655                                         iflag = port->normal_termios.c_iflag;
1656                                 } else {
1657                                         cflag = port->tty->termios->c_cflag;
1658                                         iflag = port->tty->termios->c_iflag;
1659                                 }
1660
1661                                 mon_data_ext.databits[i] = cflag & CSIZE;
1662
1663                                 mon_data_ext.stopbits[i] = cflag & CSTOPB;
1664
1665                                 mon_data_ext.parity[i] =
1666                                         cflag & (PARENB | PARODD | CMSPAR);
1667
1668                                 mon_data_ext.flowctrl[i] = 0x00;
1669
1670                                 if (cflag & CRTSCTS)
1671                                         mon_data_ext.flowctrl[i] |= 0x03;
1672
1673                                 if (iflag & (IXON | IXOFF))
1674                                         mon_data_ext.flowctrl[i] |= 0x0C;
1675
1676                                 if (port->type == PORT_16550A)
1677                                         mon_data_ext.fifo[i] = 1;
1678                                 else
1679                                         mon_data_ext.fifo[i] = 0;
1680
1681                                 p = i % 4;
1682                                 shiftbit = p * 2;
1683                                 opmode = inb(port->opmode_ioaddr) >> shiftbit;
1684                                 opmode &= OP_MODE_MASK;
1685
1686                                 mon_data_ext.iftype[i] = opmode;
1687
1688                         }
1689                         if (copy_to_user(argp, &mon_data_ext,
1690                                                 sizeof(mon_data_ext)))
1691                                 return -EFAULT;
1692
1693                         return 0;
1694
1695         } default:
1696                 return -ENOIOCTLCMD;
1697         }
1698         return 0;
1699 }
1700
1701 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1702                 unsigned int cmd, unsigned long arg)
1703 {
1704         struct mxser_port *info = tty->driver_data;
1705         struct async_icount cprev, cnow;        /* kernel counter temps */
1706         struct serial_icounter_struct __user *p_cuser;
1707         unsigned long templ;
1708         unsigned long flags;
1709         void __user *argp = (void __user *)arg;
1710         int retval;
1711
1712         if (tty->index == MXSER_PORTS)
1713                 return mxser_ioctl_special(cmd, argp);
1714
1715         /* following add by Victor Yu. 01-05-2004 */
1716         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1717                 int p;
1718                 unsigned long opmode;
1719                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1720                 int shiftbit;
1721                 unsigned char val, mask;
1722
1723                 p = tty->index % 4;
1724                 if (cmd == MOXA_SET_OP_MODE) {
1725                         if (get_user(opmode, (int __user *) argp))
1726                                 return -EFAULT;
1727                         if (opmode != RS232_MODE &&
1728                                         opmode != RS485_2WIRE_MODE &&
1729                                         opmode != RS422_MODE &&
1730                                         opmode != RS485_4WIRE_MODE)
1731                                 return -EFAULT;
1732                         mask = ModeMask[p];
1733                         shiftbit = p * 2;
1734                         val = inb(info->opmode_ioaddr);
1735                         val &= mask;
1736                         val |= (opmode << shiftbit);
1737                         outb(val, info->opmode_ioaddr);
1738                 } else {
1739                         shiftbit = p * 2;
1740                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1741                         opmode &= OP_MODE_MASK;
1742                         if (copy_to_user(argp, &opmode, sizeof(int)))
1743                                 return -EFAULT;
1744                 }
1745                 return 0;
1746         }
1747         /* above add by Victor Yu. 01-05-2004 */
1748
1749         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1750                         test_bit(TTY_IO_ERROR, &tty->flags))
1751                 return -EIO;
1752
1753         switch (cmd) {
1754         case TCSBRK:            /* SVID version: non-zero arg --> no break */
1755                 retval = tty_check_change(tty);
1756                 if (retval)
1757                         return retval;
1758                 tty_wait_until_sent(tty, 0);
1759                 if (!arg)
1760                         mxser_send_break(info, HZ / 4); /* 1/4 second */
1761                 return 0;
1762         case TCSBRKP:           /* support for POSIX tcsendbreak() */
1763                 retval = tty_check_change(tty);
1764                 if (retval)
1765                         return retval;
1766                 tty_wait_until_sent(tty, 0);
1767                 mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1768                 return 0;
1769         case TIOCGSOFTCAR:
1770                 return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *)argp);
1771         case TIOCSSOFTCAR:
1772                 if (get_user(templ, (unsigned long __user *) argp))
1773                         return -EFAULT;
1774                 arg = templ;
1775                 tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
1776                 return 0;
1777         case TIOCGSERIAL:
1778                 return mxser_get_serial_info(info, argp);
1779         case TIOCSSERIAL:
1780                 return mxser_set_serial_info(info, argp);
1781         case TIOCSERGETLSR:     /* Get line status register */
1782                 return mxser_get_lsr_info(info, argp);
1783                 /*
1784                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1785                  * - mask passed in arg for lines of interest
1786                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1787                  * Caller should use TIOCGICOUNT to see which one it was
1788                  */
1789         case TIOCMIWAIT: {
1790                 DECLARE_WAITQUEUE(wait, current);
1791                 int ret;
1792                 spin_lock_irqsave(&info->slock, flags);
1793                 cprev = info->icount;   /* note the counters on entry */
1794                 spin_unlock_irqrestore(&info->slock, flags);
1795
1796                 add_wait_queue(&info->delta_msr_wait, &wait);
1797                 while (1) {
1798                         spin_lock_irqsave(&info->slock, flags);
1799                         cnow = info->icount;    /* atomic copy */
1800                         spin_unlock_irqrestore(&info->slock, flags);
1801
1802                         set_current_state(TASK_INTERRUPTIBLE);
1803                         if (((arg & TIOCM_RNG) &&
1804                                         (cnow.rng != cprev.rng)) ||
1805                                         ((arg & TIOCM_DSR) &&
1806                                         (cnow.dsr != cprev.dsr)) ||
1807                                         ((arg & TIOCM_CD) &&
1808                                         (cnow.dcd != cprev.dcd)) ||
1809                                         ((arg & TIOCM_CTS) &&
1810                                         (cnow.cts != cprev.cts))) {
1811                                 ret = 0;
1812                                 break;
1813                         }
1814                         /* see if a signal did it */
1815                         if (signal_pending(current)) {
1816                                 ret = -ERESTARTSYS;
1817                                 break;
1818                         }
1819                         cprev = cnow;
1820                 }
1821                 current->state = TASK_RUNNING;
1822                 remove_wait_queue(&info->delta_msr_wait, &wait);
1823                 break;
1824         }
1825         /* NOTREACHED */
1826         /*
1827          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1828          * Return: write counters to the user passed counter struct
1829          * NB: both 1->0 and 0->1 transitions are counted except for
1830          *     RI where only 0->1 is counted.
1831          */
1832         case TIOCGICOUNT:
1833                 spin_lock_irqsave(&info->slock, flags);
1834                 cnow = info->icount;
1835                 spin_unlock_irqrestore(&info->slock, flags);
1836                 p_cuser = argp;
1837                 /* modified by casper 1/11/2000 */
1838                 if (put_user(cnow.frame, &p_cuser->frame))
1839                         return -EFAULT;
1840                 if (put_user(cnow.brk, &p_cuser->brk))
1841                         return -EFAULT;
1842                 if (put_user(cnow.overrun, &p_cuser->overrun))
1843                         return -EFAULT;
1844                 if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1845                         return -EFAULT;
1846                 if (put_user(cnow.parity, &p_cuser->parity))
1847                         return -EFAULT;
1848                 if (put_user(cnow.rx, &p_cuser->rx))
1849                         return -EFAULT;
1850                 if (put_user(cnow.tx, &p_cuser->tx))
1851                         return -EFAULT;
1852                 put_user(cnow.cts, &p_cuser->cts);
1853                 put_user(cnow.dsr, &p_cuser->dsr);
1854                 put_user(cnow.rng, &p_cuser->rng);
1855                 put_user(cnow.dcd, &p_cuser->dcd);
1856                 return 0;
1857         case MOXA_HighSpeedOn:
1858                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1859         case MOXA_SDS_RSTICOUNTER:
1860                 info->mon_data.rxcnt = 0;
1861                 info->mon_data.txcnt = 0;
1862                 return 0;
1863 /* (above) added by James. */
1864         case MOXA_ASPP_SETBAUD:{
1865                 long baud;
1866                 if (get_user(baud, (long __user *)argp))
1867                         return -EFAULT;
1868                 mxser_set_baud(info, baud);
1869                 return 0;
1870         }
1871         case MOXA_ASPP_GETBAUD:
1872                 if (copy_to_user(argp, &info->realbaud, sizeof(long)))
1873                         return -EFAULT;
1874
1875                 return 0;
1876
1877         case MOXA_ASPP_OQUEUE:{
1878                 int len, lsr;
1879
1880                 len = mxser_chars_in_buffer(tty);
1881
1882                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1883
1884                 len += (lsr ? 0 : 1);
1885
1886                 if (copy_to_user(argp, &len, sizeof(int)))
1887                         return -EFAULT;
1888
1889                 return 0;
1890         }
1891         case MOXA_ASPP_MON: {
1892                 int mcr, status;
1893
1894                 /* info->mon_data.ser_param = tty->termios->c_cflag; */
1895
1896                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1897                 mxser_check_modem_status(info, status);
1898
1899                 mcr = inb(info->ioaddr + UART_MCR);
1900                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1901                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1902                 else
1903                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1904
1905                 if (mcr & MOXA_MUST_MCR_TX_XON)
1906                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1907                 else
1908                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1909
1910                 if (info->tty->hw_stopped)
1911                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1912                 else
1913                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1914
1915                 if (copy_to_user(argp, &info->mon_data,
1916                                 sizeof(struct mxser_mon)))
1917                         return -EFAULT;
1918
1919                 return 0;
1920         }
1921         case MOXA_ASPP_LSTATUS: {
1922                 if (copy_to_user(argp, &info->err_shadow,
1923                                 sizeof(unsigned char)))
1924                         return -EFAULT;
1925
1926                 info->err_shadow = 0;
1927                 return 0;
1928         }
1929         case MOXA_SET_BAUD_METHOD: {
1930                 int method;
1931
1932                 if (get_user(method, (int __user *)argp))
1933                         return -EFAULT;
1934                 mxser_set_baud_method[tty->index] = method;
1935                 if (copy_to_user(argp, &method, sizeof(int)))
1936                         return -EFAULT;
1937
1938                 return 0;
1939         }
1940         default:
1941                 return -ENOIOCTLCMD;
1942         }
1943         return 0;
1944 }
1945
1946 static void mxser_stoprx(struct tty_struct *tty)
1947 {
1948         struct mxser_port *info = tty->driver_data;
1949
1950         info->ldisc_stop_rx = 1;
1951         if (I_IXOFF(tty)) {
1952                 /* following add by Victor Yu. 09-02-2002 */
1953                 if (info->board->chip_flag) {
1954                         info->IER &= ~MOXA_MUST_RECV_ISR;
1955                         outb(info->IER, info->ioaddr + UART_IER);
1956                 } else if (!(info->flags & ASYNC_CLOSING)) {
1957                         info->x_char = STOP_CHAR(tty);
1958                         outb(0, info->ioaddr + UART_IER);
1959                         info->IER |= UART_IER_THRI;
1960                         outb(info->IER, info->ioaddr + UART_IER);
1961                 }
1962         }
1963
1964         if (info->tty->termios->c_cflag & CRTSCTS) {
1965                 info->MCR &= ~UART_MCR_RTS;
1966                 outb(info->MCR, info->ioaddr + UART_MCR);
1967         }
1968 }
1969
1970 /*
1971  * This routine is called by the upper-layer tty layer to signal that
1972  * incoming characters should be throttled.
1973  */
1974 static void mxser_throttle(struct tty_struct *tty)
1975 {
1976         mxser_stoprx(tty);
1977 }
1978
1979 static void mxser_unthrottle(struct tty_struct *tty)
1980 {
1981         struct mxser_port *info = tty->driver_data;
1982
1983         /* startrx */
1984         info->ldisc_stop_rx = 0;
1985         if (I_IXOFF(tty)) {
1986                 if (info->x_char)
1987                         info->x_char = 0;
1988                 else {
1989                         /* following add by Victor Yu. 09-02-2002 */
1990                         if (info->board->chip_flag) {
1991                                 info->IER |= MOXA_MUST_RECV_ISR;
1992                                 outb(info->IER, info->ioaddr + UART_IER);
1993                         } else if (!(info->flags & ASYNC_CLOSING)) {
1994                                 info->x_char = START_CHAR(tty);
1995                                 outb(0, info->ioaddr + UART_IER);
1996                                 info->IER |= UART_IER_THRI;
1997                                 outb(info->IER, info->ioaddr + UART_IER);
1998                         }
1999                 }
2000         }
2001
2002         if (info->tty->termios->c_cflag & CRTSCTS) {
2003                 info->MCR |= UART_MCR_RTS;
2004                 outb(info->MCR, info->ioaddr + UART_MCR);
2005         }
2006 }
2007
2008 /*
2009  * mxser_stop() and mxser_start()
2010  *
2011  * This routines are called before setting or resetting tty->stopped.
2012  * They enable or disable transmitter interrupts, as necessary.
2013  */
2014 static void mxser_stop(struct tty_struct *tty)
2015 {
2016         struct mxser_port *info = tty->driver_data;
2017         unsigned long flags;
2018
2019         spin_lock_irqsave(&info->slock, flags);
2020         if (info->IER & UART_IER_THRI) {
2021                 info->IER &= ~UART_IER_THRI;
2022                 outb(info->IER, info->ioaddr + UART_IER);
2023         }
2024         spin_unlock_irqrestore(&info->slock, flags);
2025 }
2026
2027 static void mxser_start(struct tty_struct *tty)
2028 {
2029         struct mxser_port *info = tty->driver_data;
2030         unsigned long flags;
2031
2032         spin_lock_irqsave(&info->slock, flags);
2033         if (info->xmit_cnt && info->xmit_buf
2034                         /* && !(info->IER & UART_IER_THRI) */) {
2035                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2036                 info->IER |= UART_IER_THRI;
2037                 outb(info->IER, info->ioaddr + UART_IER);
2038         }
2039         spin_unlock_irqrestore(&info->slock, flags);
2040 }
2041
2042 static void mxser_set_termios(struct tty_struct *tty, struct termios *old_termios)
2043 {
2044         struct mxser_port *info = tty->driver_data;
2045         unsigned long flags;
2046
2047         if ((tty->termios->c_cflag != old_termios->c_cflag) ||
2048                         (RELEVANT_IFLAG(tty->termios->c_iflag) != RELEVANT_IFLAG(old_termios->c_iflag))) {
2049
2050                 mxser_change_speed(info, old_termios);
2051
2052                 if ((old_termios->c_cflag & CRTSCTS) &&
2053                                 !(tty->termios->c_cflag & CRTSCTS)) {
2054                         tty->hw_stopped = 0;
2055                         mxser_start(tty);
2056                 }
2057         }
2058
2059 /* Handle sw stopped */
2060         if ((old_termios->c_iflag & IXON) &&
2061                         !(tty->termios->c_iflag & IXON)) {
2062                 tty->stopped = 0;
2063
2064                 /* following add by Victor Yu. 09-02-2002 */
2065                 if (info->board->chip_flag) {
2066                         spin_lock_irqsave(&info->slock, flags);
2067                         DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
2068                         spin_unlock_irqrestore(&info->slock, flags);
2069                 }
2070                 /* above add by Victor Yu. 09-02-2002 */
2071
2072                 mxser_start(tty);
2073         }
2074 }
2075
2076 /*
2077  * mxser_wait_until_sent() --- wait until the transmitter is empty
2078  */
2079 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2080 {
2081         struct mxser_port *info = tty->driver_data;
2082         unsigned long orig_jiffies, char_time;
2083         int lsr;
2084
2085         if (info->type == PORT_UNKNOWN)
2086                 return;
2087
2088         if (info->xmit_fifo_size == 0)
2089                 return;         /* Just in case.... */
2090
2091         orig_jiffies = jiffies;
2092         /*
2093          * Set the check interval to be 1/5 of the estimated time to
2094          * send a single character, and make it at least 1.  The check
2095          * interval should also be less than the timeout.
2096          *
2097          * Note: we have to use pretty tight timings here to satisfy
2098          * the NIST-PCTS.
2099          */
2100         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2101         char_time = char_time / 5;
2102         if (char_time == 0)
2103                 char_time = 1;
2104         if (timeout && timeout < char_time)
2105                 char_time = timeout;
2106         /*
2107          * If the transmitter hasn't cleared in twice the approximate
2108          * amount of time to send the entire FIFO, it probably won't
2109          * ever clear.  This assumes the UART isn't doing flow
2110          * control, which is currently the case.  Hence, if it ever
2111          * takes longer than info->timeout, this is probably due to a
2112          * UART bug of some kind.  So, we clamp the timeout parameter at
2113          * 2*info->timeout.
2114          */
2115         if (!timeout || timeout > 2 * info->timeout)
2116                 timeout = 2 * info->timeout;
2117 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2118         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2119                 timeout, char_time);
2120         printk("jiff=%lu...", jiffies);
2121 #endif
2122         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2123 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2124                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2125 #endif
2126                 schedule_timeout_interruptible(char_time);
2127                 if (signal_pending(current))
2128                         break;
2129                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2130                         break;
2131         }
2132         set_current_state(TASK_RUNNING);
2133
2134 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2135         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2136 #endif
2137 }
2138
2139
2140 /*
2141  * This routine is called by tty_hangup() when a hangup is signaled.
2142  */
2143 void mxser_hangup(struct tty_struct *tty)
2144 {
2145         struct mxser_port *info = tty->driver_data;
2146
2147         mxser_flush_buffer(tty);
2148         mxser_shutdown(info);
2149         info->event = 0;
2150         info->count = 0;
2151         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2152         info->tty = NULL;
2153         wake_up_interruptible(&info->open_wait);
2154 }
2155
2156
2157 /* added by James 03-12-2004. */
2158 /*
2159  * mxser_rs_break() --- routine which turns the break handling on or off
2160  */
2161 static void mxser_rs_break(struct tty_struct *tty, int break_state)
2162 {
2163         struct mxser_port *info = tty->driver_data;
2164         unsigned long flags;
2165
2166         spin_lock_irqsave(&info->slock, flags);
2167         if (break_state == -1)
2168                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2169                         info->ioaddr + UART_LCR);
2170         else
2171                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2172                         info->ioaddr + UART_LCR);
2173         spin_unlock_irqrestore(&info->slock, flags);
2174 }
2175
2176 /* (above) added by James. */
2177
2178 static void mxser_receive_chars(struct mxser_port *port, int *status)
2179 {
2180         struct tty_struct *tty = port->tty;
2181         unsigned char ch, gdl;
2182         int ignored = 0;
2183         int cnt = 0;
2184         int recv_room;
2185         int max = 256;
2186         unsigned long flags;
2187
2188         spin_lock_irqsave(&port->slock, flags);
2189
2190         recv_room = tty->receive_room;
2191         if ((recv_room == 0) && (!port->ldisc_stop_rx)) {
2192                 /* mxser_throttle(tty); */
2193                 mxser_stoprx(tty);
2194                 /* return; */
2195         }
2196
2197         /* following add by Victor Yu. 09-02-2002 */
2198         if (port->board->chip_flag != MOXA_OTHER_UART) {
2199
2200                 if (*status & UART_LSR_SPECIAL)
2201                         goto intr_old;
2202                 /* following add by Victor Yu. 02-11-2004 */
2203                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2204                                 (*status & MOXA_MUST_LSR_RERR))
2205                         goto intr_old;
2206                 /* above add by Victor Yu. 02-14-2004 */
2207                 if (*status & MOXA_MUST_LSR_RERR)
2208                         goto intr_old;
2209
2210                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2211
2212                 /* add by Victor Yu. 02-11-2004 */
2213                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2214                         gdl &= MOXA_MUST_GDL_MASK;
2215                 if (gdl >= recv_room) {
2216                         if (!port->ldisc_stop_rx) {
2217                                 /* mxser_throttle(tty); */
2218                                 mxser_stoprx(tty);
2219                         }
2220                         /* return; */
2221                 }
2222                 while (gdl--) {
2223                         ch = inb(port->ioaddr + UART_RX);
2224                         tty_insert_flip_char(tty, ch, 0);
2225                         cnt++;
2226                 }
2227                 goto end_intr;
2228         }
2229  intr_old:
2230         /* above add by Victor Yu. 09-02-2002 */
2231
2232         do {
2233                 if (max-- < 0)
2234                         break;
2235
2236                 ch = inb(port->ioaddr + UART_RX);
2237                 /* following add by Victor Yu. 09-02-2002 */
2238                 if (port->board->chip_flag && (*status & UART_LSR_OE)
2239                                 /*&& !(*status&UART_LSR_DR) */)
2240                         outb(0x23, port->ioaddr + UART_FCR);
2241                 *status &= port->read_status_mask;
2242                 /* above add by Victor Yu. 09-02-2002 */
2243                 if (*status & port->ignore_status_mask) {
2244                         if (++ignored > 100)
2245                                 break;
2246                 } else {
2247                         char flag = 0;
2248                         if (*status & UART_LSR_SPECIAL) {
2249                                 if (*status & UART_LSR_BI) {
2250                                         flag = TTY_BREAK;
2251 /* added by casper 1/11/2000 */
2252                                         port->icount.brk++;
2253
2254                                         if (port->flags & ASYNC_SAK)
2255                                                 do_SAK(tty);
2256                                 } else if (*status & UART_LSR_PE) {
2257                                         flag = TTY_PARITY;
2258 /* added by casper 1/11/2000 */
2259                                         port->icount.parity++;
2260                                 } else if (*status & UART_LSR_FE) {
2261                                         flag = TTY_FRAME;
2262 /* added by casper 1/11/2000 */
2263                                         port->icount.frame++;
2264                                 } else if (*status & UART_LSR_OE) {
2265                                         flag = TTY_OVERRUN;
2266 /* added by casper 1/11/2000 */
2267                                         port->icount.overrun++;
2268                                 } else
2269                                         flags = TTY_BREAK;
2270                         } else
2271                                 flags = 0;
2272                         tty_insert_flip_char(tty, ch, flag);
2273                         cnt++;
2274                         if (cnt >= recv_room) {
2275                                 if (!port->ldisc_stop_rx) {
2276                                         /* mxser_throttle(tty); */
2277                                         mxser_stoprx(tty);
2278                                 }
2279                                 break;
2280                         }
2281
2282                 }
2283
2284                 /* following add by Victor Yu. 09-02-2002 */
2285                 if (port->board->chip_flag)
2286                         break;
2287
2288                 /* mask by Victor Yu. 09-02-2002
2289                  *status = inb(port->ioaddr + UART_LSR) & port->read_status_mask;
2290                  */
2291                 /* following add by Victor Yu. 09-02-2002 */
2292                 *status = inb(port->ioaddr + UART_LSR);
2293                 /* above add by Victor Yu. 09-02-2002 */
2294         } while (*status & UART_LSR_DR);
2295
2296 end_intr:               /* add by Victor Yu. 09-02-2002 */
2297         mxvar_log.rxcnt[port->tty->index] += cnt;
2298         port->mon_data.rxcnt += cnt;
2299         port->mon_data.up_rxcnt += cnt;
2300         spin_unlock_irqrestore(&port->slock, flags);
2301
2302         tty_flip_buffer_push(tty);
2303 }
2304
2305 static void mxser_transmit_chars(struct mxser_port *port)
2306 {
2307         int count, cnt;
2308         unsigned long flags;
2309
2310         spin_lock_irqsave(&port->slock, flags);
2311
2312         if (port->x_char) {
2313                 outb(port->x_char, port->ioaddr + UART_TX);
2314                 port->x_char = 0;
2315                 mxvar_log.txcnt[port->tty->index]++;
2316                 port->mon_data.txcnt++;
2317                 port->mon_data.up_txcnt++;
2318
2319 /* added by casper 1/11/2000 */
2320                 port->icount.tx++;
2321                 goto unlock;
2322         }
2323
2324         if (port->xmit_buf == 0)
2325                 goto unlock;
2326
2327         if (port->xmit_cnt == 0) {
2328                 if (port->xmit_cnt < WAKEUP_CHARS) { /* XXX what's this for?? */
2329                         set_bit(MXSER_EVENT_TXLOW, &port->event);
2330                         schedule_work(&port->tqueue);
2331                 }
2332                 goto unlock;
2333         }
2334         if (port->tty->stopped || (port->tty->hw_stopped &&
2335                         (port->type != PORT_16550A) &&
2336                         (!port->board->chip_flag))) {
2337                 port->IER &= ~UART_IER_THRI;
2338                 outb(port->IER, port->ioaddr + UART_IER);
2339                 goto unlock;
2340         }
2341
2342         cnt = port->xmit_cnt;
2343         count = port->xmit_fifo_size;
2344         do {
2345                 outb(port->xmit_buf[port->xmit_tail++],
2346                         port->ioaddr + UART_TX);
2347                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2348                 if (--port->xmit_cnt <= 0)
2349                         break;
2350         } while (--count > 0);
2351         mxvar_log.txcnt[port->tty->index] += (cnt - port->xmit_cnt);
2352
2353 /* added by James 03-12-2004. */
2354         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2355         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2356
2357 /* added by casper 1/11/2000 */
2358         port->icount.tx += (cnt - port->xmit_cnt);
2359
2360         if (port->xmit_cnt < WAKEUP_CHARS) {
2361                 set_bit(MXSER_EVENT_TXLOW, &port->event);
2362                 schedule_work(&port->tqueue);
2363         }
2364         if (port->xmit_cnt <= 0) {
2365                 port->IER &= ~UART_IER_THRI;
2366                 outb(port->IER, port->ioaddr + UART_IER);
2367         }
2368 unlock:
2369         spin_unlock_irqrestore(&port->slock, flags);
2370 }
2371
2372 /*
2373  * This is the serial driver's generic interrupt routine
2374  */
2375 static irqreturn_t mxser_interrupt(int irq, void *dev_id, struct pt_regs *regs)
2376 {
2377         int status, iir, i;
2378         struct mxser_board *brd = NULL;
2379         struct mxser_port *port;
2380         int max, irqbits, bits, msr;
2381         int pass_counter = 0;
2382         unsigned int int_cnt;
2383         int handled = IRQ_NONE;
2384
2385         /* spin_lock(&gm_lock); */
2386
2387         for (i = 0; i < MXSER_BOARDS; i++)
2388                 if (dev_id == &mxser_boards[i]) {
2389                         brd = dev_id;
2390                         break;
2391                 }
2392
2393         if (i == MXSER_BOARDS)
2394                 goto irq_stop;
2395         if (brd == NULL)
2396                 goto irq_stop;
2397         max = brd->info->nports;
2398         while (1) {
2399                 irqbits = inb(brd->vector) & brd->vector_mask;
2400                 if (irqbits == brd->vector_mask)
2401                         break;
2402
2403                 handled = IRQ_HANDLED;
2404                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2405                         if (irqbits == brd->vector_mask)
2406                                 break;
2407                         if (bits & irqbits)
2408                                 continue;
2409                         port = &brd->ports[i];
2410
2411                         int_cnt = 0;
2412                         do {
2413                                 /* following add by Victor Yu. 09-13-2002 */
2414                                 iir = inb(port->ioaddr + UART_IIR);
2415                                 if (iir & UART_IIR_NO_INT)
2416                                         break;
2417                                 iir &= MOXA_MUST_IIR_MASK;
2418                                 if (!port->tty) {
2419                                         status = inb(port->ioaddr + UART_LSR);
2420                                         outb(0x27, port->ioaddr + UART_FCR);
2421                                         inb(port->ioaddr + UART_MSR);
2422                                         break;
2423                                 }
2424                                 /* above add by Victor Yu. 09-13-2002 */
2425
2426                                 /* following add by Victor Yu. 09-02-2002 */
2427                                 status = inb(port->ioaddr + UART_LSR);
2428
2429                                 if (status & UART_LSR_PE)
2430                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2431                                 if (status & UART_LSR_FE)
2432                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2433                                 if (status & UART_LSR_OE)
2434                                         port->err_shadow |=
2435                                                 NPPI_NOTIFY_HW_OVERRUN;
2436                                 if (status & UART_LSR_BI)
2437                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2438
2439                                 if (port->board->chip_flag) {
2440                                         /*
2441                                            if ( (status & 0x02) && !(status & 0x01) ) {
2442                                            outb(port->ioaddr+UART_FCR,  0x23);
2443                                            continue;
2444                                            }
2445                                          */
2446                                         if (iir == MOXA_MUST_IIR_GDA ||
2447                                             iir == MOXA_MUST_IIR_RDA ||
2448                                             iir == MOXA_MUST_IIR_RTO ||
2449                                             iir == MOXA_MUST_IIR_LSR)
2450                                                 mxser_receive_chars(port,
2451                                                                 &status);
2452
2453                                 } else {
2454                                         /* above add by Victor Yu. 09-02-2002 */
2455
2456                                         status &= port->read_status_mask;
2457                                         if (status & UART_LSR_DR)
2458                                                 mxser_receive_chars(port,
2459                                                                 &status);
2460                                 }
2461                                 msr = inb(port->ioaddr + UART_MSR);
2462                                 if (msr & UART_MSR_ANY_DELTA)
2463                                         mxser_check_modem_status(port, msr);
2464
2465                                 /* following add by Victor Yu. 09-13-2002 */
2466                                 if (port->board->chip_flag) {
2467                                         if (iir == 0x02 && (status &
2468                                                                 UART_LSR_THRE))
2469                                                 mxser_transmit_chars(port);
2470                                 } else {
2471                                         /* above add by Victor Yu. 09-13-2002 */
2472
2473                                         if (status & UART_LSR_THRE)
2474                                                 mxser_transmit_chars(port);
2475                                 }
2476                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2477                 }
2478                 if (pass_counter++ > MXSER_ISR_PASS_LIMIT)
2479                         break;  /* Prevent infinite loops */
2480         }
2481
2482       irq_stop:
2483         /* spin_unlock(&gm_lock); */
2484         return handled;
2485 }
2486
2487 static const struct tty_operations mxser_ops = {
2488         .open = mxser_open,
2489         .close = mxser_close,
2490         .write = mxser_write,
2491         .put_char = mxser_put_char,
2492         .flush_chars = mxser_flush_chars,
2493         .write_room = mxser_write_room,
2494         .chars_in_buffer = mxser_chars_in_buffer,
2495         .flush_buffer = mxser_flush_buffer,
2496         .ioctl = mxser_ioctl,
2497         .throttle = mxser_throttle,
2498         .unthrottle = mxser_unthrottle,
2499         .set_termios = mxser_set_termios,
2500         .stop = mxser_stop,
2501         .start = mxser_start,
2502         .hangup = mxser_hangup,
2503         .break_ctl = mxser_rs_break,
2504         .wait_until_sent = mxser_wait_until_sent,
2505         .tiocmget = mxser_tiocmget,
2506         .tiocmset = mxser_tiocmset,
2507 };
2508
2509 /*
2510  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2511  */
2512
2513 static void mxser_release_res(struct mxser_board *brd, unsigned int irq)
2514 {
2515         struct pci_dev *pdev = brd->pdev;
2516
2517         if (irq)
2518                 free_irq(brd->irq, brd);
2519         if (pdev != NULL) {     /* PCI */
2520                 pci_release_region(pdev, 2);
2521                 pci_release_region(pdev, 3);
2522                 pci_dev_put(pdev);
2523         } else {
2524                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2525                 release_region(brd->vector, 1);
2526         }
2527 }
2528
2529 static int __devinit mxser_initbrd(struct mxser_board *brd)
2530 {
2531         struct mxser_port *info;
2532         unsigned int i;
2533         int retval;
2534
2535         printk(KERN_INFO "max. baud rate = %d bps.\n", brd->ports[0].max_baud);
2536
2537         for (i = 0; i < brd->info->nports; i++) {
2538                 info = &brd->ports[i];
2539                 info->board = brd;
2540                 info->stop_rx = 0;
2541                 info->ldisc_stop_rx = 0;
2542
2543                 /* Enhance mode enabled here */
2544                 if (brd->chip_flag != MOXA_OTHER_UART)
2545                         ENABLE_MOXA_MUST_ENCHANCE_MODE(info->ioaddr);
2546
2547                 info->flags = ASYNC_SHARE_IRQ;
2548                 info->type = brd->uart_type;
2549
2550                 process_txrx_fifo(info);
2551
2552                 info->custom_divisor = info->baud_base * 16;
2553                 info->close_delay = 5 * HZ / 10;
2554                 info->closing_wait = 30 * HZ;
2555                 INIT_WORK(&info->tqueue, mxser_do_softint, info);
2556                 info->normal_termios = mxvar_sdriver->init_termios;
2557                 init_waitqueue_head(&info->open_wait);
2558                 init_waitqueue_head(&info->close_wait);
2559                 init_waitqueue_head(&info->delta_msr_wait);
2560                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2561                 info->err_shadow = 0;
2562                 spin_lock_init(&info->slock);
2563
2564                 /* before set INT ISR, disable all int */
2565                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2566                         info->ioaddr + UART_IER);
2567         }
2568         /*
2569          * Allocate the IRQ if necessary
2570          */
2571
2572         retval = request_irq(brd->irq, mxser_interrupt,
2573                         (brd->ports[0].flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED :
2574                         IRQF_DISABLED, "mxser", brd);
2575         if (retval) {
2576                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2577                         "conflict with another device.\n",
2578                         brd->info->name, brd->irq);
2579                 /* We hold resources, we need to release them. */
2580                 mxser_release_res(brd, 0);
2581                 return retval;
2582         }
2583         return 0;
2584 }
2585
2586 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2587 {
2588         int id, i, bits;
2589         unsigned short regs[16], irq;
2590         unsigned char scratch, scratch2;
2591
2592         brd->chip_flag = MOXA_OTHER_UART;
2593
2594         id = mxser_read_register(cap, regs);
2595         switch (id) {
2596         case C168_ASIC_ID:
2597                 brd->info = &mxser_cards[0];
2598                 break;
2599         case C104_ASIC_ID:
2600                 brd->info = &mxser_cards[1];
2601                 break;
2602         case CI104J_ASIC_ID:
2603                 brd->info = &mxser_cards[2];
2604                 break;
2605         case C102_ASIC_ID:
2606                 brd->info = &mxser_cards[5];
2607                 break;
2608         case CI132_ASIC_ID:
2609                 brd->info = &mxser_cards[6];
2610                 break;
2611         case CI134_ASIC_ID:
2612                 brd->info = &mxser_cards[7];
2613                 break;
2614         default:
2615                 return 0;
2616         }
2617
2618         irq = 0;
2619         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2620            Flag-hack checks if configuration should be read as 2-port here. */
2621         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2622                 irq = regs[9] & 0xF000;
2623                 irq = irq | (irq >> 4);
2624                 if (irq != (regs[9] & 0xFF00))
2625                         return MXSER_ERR_IRQ_CONFLIT;
2626         } else if (brd->info->nports == 4) {
2627                 irq = regs[9] & 0xF000;
2628                 irq = irq | (irq >> 4);
2629                 irq = irq | (irq >> 8);
2630                 if (irq != regs[9])
2631                         return MXSER_ERR_IRQ_CONFLIT;
2632         } else if (brd->info->nports == 8) {
2633                 irq = regs[9] & 0xF000;
2634                 irq = irq | (irq >> 4);
2635                 irq = irq | (irq >> 8);
2636                 if ((irq != regs[9]) || (irq != regs[10]))
2637                         return MXSER_ERR_IRQ_CONFLIT;
2638         }
2639
2640         if (!irq)
2641                 return MXSER_ERR_IRQ;
2642         brd->irq = ((int)(irq & 0xF000) >> 12);
2643         for (i = 0; i < 8; i++)
2644                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2645         if ((regs[12] & 0x80) == 0)
2646                 return MXSER_ERR_VECTOR;
2647         brd->vector = (int)regs[11];    /* interrupt vector */
2648         if (id == 1)
2649                 brd->vector_mask = 0x00FF;
2650         else
2651                 brd->vector_mask = 0x000F;
2652         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2653                 if (regs[12] & bits) {
2654                         brd->ports[i].baud_base = 921600;
2655                         brd->ports[i].max_baud = 921600;        /* add by Victor Yu. 09-04-2002 */
2656                 } else {
2657                         brd->ports[i].baud_base = 115200;
2658                         brd->ports[i].max_baud = 115200;        /* add by Victor Yu. 09-04-2002 */
2659                 }
2660         }
2661         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2662         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2663         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2664         outb(scratch2, cap + UART_LCR);
2665         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2666         scratch = inb(cap + UART_IIR);
2667
2668         if (scratch & 0xC0)
2669                 brd->uart_type = PORT_16550A;
2670         else
2671                 brd->uart_type = PORT_16450;
2672         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2673                         "mxser(IO)"))
2674                 return MXSER_ERR_IOADDR;
2675         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2676                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2677                 return MXSER_ERR_VECTOR;
2678         }
2679         return brd->info->nports;
2680 }
2681
2682 static int __init mxser_get_PCI_conf(const struct pci_device_id *ent,
2683                 struct mxser_board *brd, struct pci_dev *pdev)
2684 {
2685         unsigned int i, j;
2686         unsigned long ioaddress;
2687         int retval;
2688
2689         /* io address */
2690         brd->info = &mxser_cards[ent->driver_data];
2691         ioaddress = pci_resource_start(pdev, 2);
2692         retval = pci_request_region(pdev, 2, "mxser(IO)");
2693         if (retval)
2694                 goto err;
2695
2696         for (i = 0; i < brd->info->nports; i++)
2697                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2698
2699         /* vector */
2700         ioaddress = pci_resource_start(pdev, 3);
2701         retval = pci_request_region(pdev, 3, "mxser(vector)");
2702         if (retval)
2703                 goto err_relio;
2704         brd->vector = ioaddress;
2705
2706         /* irq */
2707         brd->irq = pdev->irq;
2708
2709         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2710         brd->uart_type = PORT_16550A;
2711         brd->vector_mask = 0;
2712
2713         for (i = 0; i < brd->info->nports; i++) {
2714                 for (j = 0; j < UART_INFO_NUM; j++) {
2715                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2716                                 brd->ports[i].max_baud =
2717                                         Gpci_uart_info[j].max_baud;
2718
2719                                 /* exception....CP-102 */
2720                                 if (brd->info->flags & MXSER_HIGHBAUD)
2721                                         brd->ports[i].max_baud = 921600;
2722                                 break;
2723                         }
2724                 }
2725         }
2726
2727         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2728                 for (i = 0; i < brd->info->nports; i++) {
2729                         if (i < 4)
2730                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2731                         else
2732                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2733                 }
2734                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2735                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2736         }
2737
2738         for (i = 0; i < brd->info->nports; i++) {
2739                 brd->vector_mask |= (1 << i);
2740                 brd->ports[i].baud_base = 921600;
2741         }
2742         return 0;
2743 err_relio:
2744         pci_release_region(pdev, 2);
2745 err:
2746         return retval;
2747 }
2748
2749 static int __init mxser_module_init(void)
2750 {
2751         struct pci_dev *pdev = NULL;
2752         struct mxser_board *brd;
2753         unsigned long cap;
2754         unsigned int i, m, isaloop;
2755         int retval, b, n;
2756
2757         pr_debug("Loading module mxser ...\n");
2758
2759         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2760         if (!mxvar_sdriver)
2761                 return -ENOMEM;
2762         spin_lock_init(&gm_lock);
2763
2764         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2765                 MXSER_VERSION);
2766
2767         /* Initialize the tty_driver structure */
2768         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2769         mxvar_sdriver->name = "ttyM";
2770         mxvar_sdriver->major = ttymajor;
2771         mxvar_sdriver->minor_start = 0;
2772         mxvar_sdriver->num = MXSER_PORTS + 1;
2773         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2774         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2775         mxvar_sdriver->init_termios = tty_std_termios;
2776         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2777         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2778         tty_set_operations(mxvar_sdriver, &mxser_ops);
2779         mxvar_sdriver->ttys = mxvar_tty;
2780         mxvar_sdriver->termios = mxvar_termios;
2781         mxvar_sdriver->termios_locked = mxvar_termios_locked;
2782
2783         retval = tty_register_driver(mxvar_sdriver);
2784         if (retval) {
2785                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2786                                 "tty driver !\n");
2787                 goto err_put;
2788         }
2789
2790         mxvar_diagflag = 0;
2791
2792         m = 0;
2793         /* Start finding ISA boards here */
2794         for (isaloop = 0; isaloop < 2; isaloop++)
2795                 for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
2796                         if (!isaloop)
2797                                 cap = mxserBoardCAP[b]; /* predefined */
2798                         else
2799                                 cap = ioaddr[b]; /* module param */
2800
2801                         if (!cap)
2802                                 continue;
2803
2804                         brd = &mxser_boards[m];
2805                         retval = mxser_get_ISA_conf(cap, brd);
2806
2807                         if (retval != 0)
2808                                 printk(KERN_INFO "Found MOXA %s board "
2809                                         "(CAP=0x%x)\n",
2810                                         brd->info->name, ioaddr[b]);
2811
2812                         if (retval <= 0) {
2813                                 if (retval == MXSER_ERR_IRQ)
2814                                         printk(KERN_ERR "Invalid interrupt "
2815                                                 "number, board not "
2816                                                 "configured\n");
2817                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
2818                                         printk(KERN_ERR "Invalid interrupt "
2819                                                 "number, board not "
2820                                                 "configured\n");
2821                                 else if (retval == MXSER_ERR_VECTOR)
2822                                         printk(KERN_ERR "Invalid interrupt "
2823                                                 "vector, board not "
2824                                                 "configured\n");
2825                                 else if (retval == MXSER_ERR_IOADDR)
2826                                         printk(KERN_ERR "Invalid I/O address, "
2827                                                 "board not configured\n");
2828
2829                                 continue;
2830                         }
2831
2832                         brd->pdev = NULL;
2833
2834                         /* mxser_initbrd will hook ISR. */
2835                         if (mxser_initbrd(brd) < 0)
2836                                 continue;
2837
2838                         for (i = 0; i < brd->info->nports; i++)
2839                                 tty_register_device(mxvar_sdriver,
2840                                         m * MXSER_PORTS_PER_BOARD + i, NULL);
2841
2842                         m++;
2843                 }
2844
2845         /* start finding PCI board here */
2846         n = ARRAY_SIZE(mxser_pcibrds) - 1;
2847         b = 0;
2848         while (b < n) {
2849                 pdev = pci_get_device(mxser_pcibrds[b].vendor,
2850                                 mxser_pcibrds[b].device, pdev);
2851                 if (pdev == NULL) {
2852                         b++;
2853                         continue;
2854                 }
2855                 printk(KERN_INFO "Found MOXA %s board(BusNo=%d,DevNo=%d)\n",
2856                         mxser_cards[mxser_pcibrds[b].driver_data].name,
2857                         pdev->bus->number, PCI_SLOT(pdev->devfn));
2858                 if (m >= MXSER_BOARDS)
2859                         printk(KERN_ERR
2860                                 "Too many Smartio/Industio family boards find "
2861                                 "(maximum %d), board not configured\n",
2862                                 MXSER_BOARDS);
2863                 else {
2864                         if (pci_enable_device(pdev)) {
2865                                 printk(KERN_ERR "Moxa SmartI/O PCI enable "
2866                                         "fail !\n");
2867                                 continue;
2868                         }
2869                         brd = &mxser_boards[m];
2870                         brd->pdev = pdev;
2871                         retval = mxser_get_PCI_conf(&mxser_pcibrds[b],
2872                                         brd, pdev);
2873                         if (retval < 0) {
2874                                 if (retval == MXSER_ERR_IRQ)
2875                                         printk(KERN_ERR
2876                                                 "Invalid interrupt number, "
2877                                                 "board not configured\n");
2878                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
2879                                         printk(KERN_ERR
2880                                                 "Invalid interrupt number, "
2881                                                 "board not configured\n");
2882                                 else if (retval == MXSER_ERR_VECTOR)
2883                                         printk(KERN_ERR
2884                                                 "Invalid interrupt vector, "
2885                                                 "board not configured\n");
2886                                 else if (retval == MXSER_ERR_IOADDR)
2887                                         printk(KERN_ERR
2888                                                 "Invalid I/O address, "
2889                                                 "board not configured\n");
2890                                 continue;
2891                         }
2892                         /* mxser_initbrd will hook ISR. */
2893                         if (mxser_initbrd(brd) < 0)
2894                                 continue;
2895                         for (i = 0; i < brd->info->nports; i++)
2896                                 tty_register_device(mxvar_sdriver,
2897                                         m * MXSER_PORTS_PER_BOARD + i,
2898                                         &pdev->dev);
2899
2900                         m++;
2901                         /* Keep an extra reference if we succeeded. It will
2902                            be returned at unload time */
2903                         pci_dev_get(pdev);
2904                 }
2905         }
2906
2907         if (!m) {
2908                 retval = -ENODEV;
2909                 goto err_unr;
2910         }
2911
2912         pr_debug("Done.\n");
2913
2914         return 0;
2915 err_unr:
2916         tty_unregister_driver(mxvar_sdriver);
2917 err_put:
2918         put_tty_driver(mxvar_sdriver);
2919         return retval;
2920 }
2921
2922 static void __exit mxser_module_exit(void)
2923 {
2924         unsigned int i;
2925
2926         pr_debug("Unloading module mxser ...\n");
2927
2928         for (i = 0; i < MXSER_PORTS; i++)
2929                 tty_unregister_device(mxvar_sdriver, i);
2930         tty_unregister_driver(mxvar_sdriver);
2931         put_tty_driver(mxvar_sdriver);
2932
2933         for (i = 0; i < MXSER_BOARDS; i++)
2934                 if (mxser_boards[i].info != NULL)
2935                         mxser_release_res(&mxser_boards[i], 1);
2936
2937         pr_debug("Done.\n");
2938 }
2939
2940 module_init(mxser_module_init);
2941 module_exit(mxser_module_exit);