drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  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/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/serial.h>
  31 #include <linux/serial_reg.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/gfp.h>
  37 #include <linux/ioport.h>
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/pci.h>
  41 #include <linux/bitops.h>
  42
  43 #include <asm/system.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.3"         /* 1.11 */
  51 #define MXSERMAJOR       174
  52 #define MXSERCUMAJOR     175
  53
  54 #define MXSER_BOARDS            4       /* Max. boards */
  55 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  56 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  57 #define MXSER_ISR_PASS_LIMIT    100
  58
  59 #define MXSER_ERR_IOADDR        -1
  60 #define MXSER_ERR_IRQ           -2
  61 #define MXSER_ERR_IRQ_CONFLIT   -3
  62 #define MXSER_ERR_VECTOR        -4
  63
  64 /*CheckIsMoxaMust return value*/
  65 #define MOXA_OTHER_UART         0x00
  66 #define MOXA_MUST_MU150_HWID    0x01
  67 #define MOXA_MUST_MU860_HWID    0x02
  68
  69 #define WAKEUP_CHARS            256
  70
  71 #define UART_MCR_AFE            0x20
  72 #define UART_LSR_SPECIAL        0x1E
  73
  74 #define PCI_DEVICE_ID_CB108     0x1080
  75 #define PCI_DEVICE_ID_CB114     0x1142
  76 #define PCI_DEVICE_ID_CP114UL   0x1143
  77 #define PCI_DEVICE_ID_CB134I    0x1341
  78 #define PCI_DEVICE_ID_CP138U    0x1380
  79 #define PCI_DEVICE_ID_POS104UL  0x1044
  80
  81
  82 #define C168_ASIC_ID    1
  83 #define C104_ASIC_ID    2
  84 #define C102_ASIC_ID    0xB
  85 #define CI132_ASIC_ID   4
  86 #define CI134_ASIC_ID   3
  87 #define CI104J_ASIC_ID  5
  88
  89 #define MXSER_HIGHBAUD  1
  90 #define MXSER_HAS2      2
  91
  92 /* This is only for PCI */
  93 static const struct {
  94         int type;
  95         int tx_fifo;
  96         int rx_fifo;
  97         int xmit_fifo_size;
  98         int rx_high_water;
  99         int rx_trigger;
 100         int rx_low_water;
 101         long max_baud;
 102 } Gpci_uart_info[] = {
 103         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 104         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 105         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 106 };
 107 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 108
 109 struct mxser_cardinfo {
 110         char *name;
 111         unsigned int nports;
 112         unsigned int flags;
 113 };
 114
 115 static const struct mxser_cardinfo mxser_cards[] = {
 116 /* 0*/  { "C168 series",        8, },
 117         { "C104 series",        4, },
 118         { "CI-104J series",     4, },
 119         { "C168H/PCI series",   8, },
 120         { "C104H/PCI series",   4, },
 121 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 122         { "CI-132 series",      4, MXSER_HAS2 },
 123         { "CI-134 series",      4, },
 124         { "CP-132 series",      2, },
 125         { "CP-114 series",      4, },
 126 /*10*/  { "CT-114 series",      4, },
 127         { "CP-102 series",      2, MXSER_HIGHBAUD },
 128         { "CP-104U series",     4, },
 129         { "CP-168U series",     8, },
 130         { "CP-132U series",     2, },
 131 /*15*/  { "CP-134U series",     4, },
 132         { "CP-104JU series",    4, },
 133         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 134         { "CP-118U series",     8, },
 135         { "CP-102UL series",    2, },
 136 /*20*/  { "CP-102U series",     2, },
 137         { "CP-118EL series",    8, },
 138         { "CP-168EL series",    8, },
 139         { "CP-104EL series",    4, },
 140         { "CB-108 series",      8, },
 141 /*25*/  { "CB-114 series",      4, },
 142         { "CB-134I series",     4, },
 143         { "CP-138U series",     8, },
 144         { "POS-104UL series",   4, },
 145         { "CP-114UL series",    4, }
 146 };
 147
 148 /* driver_data correspond to the lines in the structure above
 149    see also ISA probe function before you change something */
 150 static struct pci_device_id mxser_pcibrds[] = {
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 178
 179 static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 180 static int ttymajor = MXSERMAJOR;
 181
 182 /* Variables for insmod */
 183
 184 MODULE_AUTHOR("Casper Yang");
 185 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 186 module_param_array(ioaddr, int, NULL, 0);
 187 module_param(ttymajor, int, 0);
 188 MODULE_LICENSE("GPL");
 189
 190 struct mxser_log {
 191         int tick;
 192         unsigned long rxcnt[MXSER_PORTS];
 193         unsigned long txcnt[MXSER_PORTS];
 194 };
 195
 196
 197 struct mxser_mon {
 198         unsigned long rxcnt;
 199         unsigned long txcnt;
 200         unsigned long up_rxcnt;
 201         unsigned long up_txcnt;
 202         int modem_status;
 203         unsigned char hold_reason;
 204 };
 205
 206 struct mxser_mon_ext {
 207         unsigned long rx_cnt[32];
 208         unsigned long tx_cnt[32];
 209         unsigned long up_rxcnt[32];
 210         unsigned long up_txcnt[32];
 211         int modem_status[32];
 212
 213         long baudrate[32];
 214         int databits[32];
 215         int stopbits[32];
 216         int parity[32];
 217         int flowctrl[32];
 218         int fifo[32];
 219         int iftype[32];
 220 };
 221
 222 struct mxser_board;
 223
 224 struct mxser_port {
 225         struct tty_port port;
 226         struct mxser_board *board;
 227
 228         unsigned long ioaddr;
 229         unsigned long opmode_ioaddr;
 230         int max_baud;
 231
 232         int rx_high_water;
 233         int rx_trigger;         /* Rx fifo trigger level */
 234         int rx_low_water;
 235         int baud_base;          /* max. speed */
 236         int type;               /* UART type */
 237
 238         int x_char;             /* xon/xoff character */
 239         int IER;                /* Interrupt Enable Register */
 240         int MCR;                /* Modem control register */
 241
 242         unsigned char stop_rx;
 243         unsigned char ldisc_stop_rx;
 244
 245         int custom_divisor;
 246         int close_delay;
 247         unsigned short closing_wait;
 248         unsigned char err_shadow;
 249         unsigned long event;
 250
 251         struct async_icount icount; /* kernel counters for 4 input interrupts */
 252         int timeout;
 253
 254         int read_status_mask;
 255         int ignore_status_mask;
 256         int xmit_fifo_size;
 257         int xmit_head;
 258         int xmit_tail;
 259         int xmit_cnt;
 260
 261         struct ktermios normal_termios;
 262
 263         struct mxser_mon mon_data;
 264
 265         spinlock_t slock;
 266         wait_queue_head_t delta_msr_wait;
 267 };
 268
 269 struct mxser_board {
 270         unsigned int idx;
 271         int irq;
 272         const struct mxser_cardinfo *info;
 273         unsigned long vector;
 274         unsigned long vector_mask;
 275
 276         int chip_flag;
 277         int uart_type;
 278
 279         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 280 };
 281
 282 struct mxser_mstatus {
 283         tcflag_t cflag;
 284         int cts;
 285         int dsr;
 286         int ri;
 287         int dcd;
 288 };
 289
 290 static struct mxser_mstatus GMStatus[MXSER_PORTS];
 291
 292 static int mxserBoardCAP[MXSER_BOARDS] = {
 293         0, 0, 0, 0
 294         /*  0x180, 0x280, 0x200, 0x320 */
 295 };
 296
 297 static struct mxser_board mxser_boards[MXSER_BOARDS];
 298 static struct tty_driver *mxvar_sdriver;
 299 static struct mxser_log mxvar_log;
 300 static int mxvar_diagflag;
 301 static unsigned char mxser_msr[MXSER_PORTS + 1];
 302 static struct mxser_mon_ext mon_data_ext;
 303 static int mxser_set_baud_method[MXSER_PORTS + 1];
 304
 305 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 306 {
 307         u8 oldlcr;
 308         u8 efr;
 309
 310         oldlcr = inb(baseio + UART_LCR);
 311         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 312
 313         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 314         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 315
 316         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 317         outb(oldlcr, baseio + UART_LCR);
 318 }
 319
 320 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 321 {
 322         u8 oldlcr;
 323         u8 efr;
 324
 325         oldlcr = inb(baseio + UART_LCR);
 326         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 327
 328         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 329         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 330
 331         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 332         outb(oldlcr, baseio + UART_LCR);
 333 }
 334
 335 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 336 {
 337         u8 oldlcr;
 338         u8 efr;
 339
 340         oldlcr = inb(baseio + UART_LCR);
 341         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 342
 343         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 344         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 345         efr |= MOXA_MUST_EFR_BANK0;
 346
 347         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 348         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 349         outb(oldlcr, baseio + UART_LCR);
 350 }
 351
 352 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 353 {
 354         u8 oldlcr;
 355         u8 efr;
 356
 357         oldlcr = inb(baseio + UART_LCR);
 358         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 359
 360         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 361         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 362         efr |= MOXA_MUST_EFR_BANK0;
 363
 364         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 365         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 366         outb(oldlcr, baseio + UART_LCR);
 367 }
 368
 369 static void mxser_set_must_fifo_value(struct mxser_port *info)
 370 {
 371         u8 oldlcr;
 372         u8 efr;
 373
 374         oldlcr = inb(info->ioaddr + UART_LCR);
 375         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 376
 377         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 378         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 379         efr |= MOXA_MUST_EFR_BANK1;
 380
 381         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 382         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 383         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 384         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 385         outb(oldlcr, info->ioaddr + UART_LCR);
 386 }
 387
 388 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 389 {
 390         u8 oldlcr;
 391         u8 efr;
 392
 393         oldlcr = inb(baseio + UART_LCR);
 394         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 395
 396         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 397         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 398         efr |= MOXA_MUST_EFR_BANK2;
 399
 400         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 401         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 402         outb(oldlcr, baseio + UART_LCR);
 403 }
 404
 405 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 406 {
 407         u8 oldlcr;
 408         u8 efr;
 409
 410         oldlcr = inb(baseio + UART_LCR);
 411         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 412
 413         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 414         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 415         efr |= MOXA_MUST_EFR_BANK2;
 416
 417         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 418         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 419         outb(oldlcr, baseio + UART_LCR);
 420 }
 421
 422 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 423 {
 424         u8 oldlcr;
 425         u8 efr;
 426
 427         oldlcr = inb(baseio + UART_LCR);
 428         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 429
 430         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 431         efr &= ~MOXA_MUST_EFR_SF_MASK;
 432
 433         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 434         outb(oldlcr, baseio + UART_LCR);
 435 }
 436
 437 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 438 {
 439         u8 oldlcr;
 440         u8 efr;
 441
 442         oldlcr = inb(baseio + UART_LCR);
 443         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 444
 445         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 446         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 447         efr |= MOXA_MUST_EFR_SF_TX1;
 448
 449         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 450         outb(oldlcr, baseio + UART_LCR);
 451 }
 452
 453 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 454 {
 455         u8 oldlcr;
 456         u8 efr;
 457
 458         oldlcr = inb(baseio + UART_LCR);
 459         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 460
 461         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 462         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 463
 464         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 465         outb(oldlcr, baseio + UART_LCR);
 466 }
 467
 468 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 469 {
 470         u8 oldlcr;
 471         u8 efr;
 472
 473         oldlcr = inb(baseio + UART_LCR);
 474         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 475
 476         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 477         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 478         efr |= MOXA_MUST_EFR_SF_RX1;
 479
 480         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 481         outb(oldlcr, baseio + UART_LCR);
 482 }
 483
 484 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 485 {
 486         u8 oldlcr;
 487         u8 efr;
 488
 489         oldlcr = inb(baseio + UART_LCR);
 490         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 491
 492         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 493         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 494
 495         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 496         outb(oldlcr, baseio + UART_LCR);
 497 }
 498
 499 #ifdef CONFIG_PCI
 500 static int __devinit CheckIsMoxaMust(unsigned long io)
 501 {
 502         u8 oldmcr, hwid;
 503         int i;
 504
 505         outb(0, io + UART_LCR);
 506         mxser_disable_must_enchance_mode(io);
 507         oldmcr = inb(io + UART_MCR);
 508         outb(0, io + UART_MCR);
 509         mxser_set_must_xon1_value(io, 0x11);
 510         if ((hwid = inb(io + UART_MCR)) != 0) {
 511                 outb(oldmcr, io + UART_MCR);
 512                 return MOXA_OTHER_UART;
 513         }
 514
 515         mxser_get_must_hardware_id(io, &hwid);
 516         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 517                 if (hwid == Gpci_uart_info[i].type)
 518                         return (int)hwid;
 519         }
 520         return MOXA_OTHER_UART;
 521 }
 522 #endif
 523
 524 static void process_txrx_fifo(struct mxser_port *info)
 525 {
 526         int i;
 527
 528         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 529                 info->rx_trigger = 1;
 530                 info->rx_high_water = 1;
 531                 info->rx_low_water = 1;
 532                 info->xmit_fifo_size = 1;
 533         } else
 534                 for (i = 0; i < UART_INFO_NUM; i++)
 535                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 536                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 537                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 538                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 539                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 540                                 break;
 541                         }
 542 }
 543
 544 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 545 {
 546         unsigned char status = 0;
 547
 548         status = inb(baseaddr + UART_MSR);
 549
 550         mxser_msr[port] &= 0x0F;
 551         mxser_msr[port] |= status;
 552         status = mxser_msr[port];
 553         if (mode)
 554                 mxser_msr[port] = 0;
 555
 556         return status;
 557 }
 558
 559 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 560                 struct mxser_port *port)
 561 {
 562         DECLARE_WAITQUEUE(wait, current);
 563         int retval;
 564         int do_clocal = 0;
 565         unsigned long flags;
 566
 567         /*
 568          * If non-blocking mode is set, or the port is not enabled,
 569          * then make the check up front and then exit.
 570          */
 571         if ((filp->f_flags & O_NONBLOCK) ||
 572                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 573                 port->port.flags |= ASYNC_NORMAL_ACTIVE;
 574                 return 0;
 575         }
 576
 577         if (tty->termios->c_cflag & CLOCAL)
 578                 do_clocal = 1;
 579
 580         /*
 581          * Block waiting for the carrier detect and the line to become
 582          * free (i.e., not in use by the callout).  While we are in
 583          * this loop, port->port.count is dropped by one, so that
 584          * mxser_close() knows when to free things.  We restore it upon
 585          * exit, either normal or abnormal.
 586          */
 587         retval = 0;
 588         add_wait_queue(&port->port.open_wait, &wait);
 589
 590         spin_lock_irqsave(&port->slock, flags);
 591         if (!tty_hung_up_p(filp))
 592                 port->port.count--;
 593         spin_unlock_irqrestore(&port->slock, flags);
 594         port->port.blocked_open++;
 595         while (1) {
 596                 spin_lock_irqsave(&port->slock, flags);
 597                 outb(inb(port->ioaddr + UART_MCR) |
 598                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 599                 spin_unlock_irqrestore(&port->slock, flags);
 600                 set_current_state(TASK_INTERRUPTIBLE);
 601                 if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
 602                         if (port->port.flags & ASYNC_HUP_NOTIFY)
 603                                 retval = -EAGAIN;
 604                         else
 605                                 retval = -ERESTARTSYS;
 606                         break;
 607                 }
 608                 if (!(port->port.flags & ASYNC_CLOSING) &&
 609                                 (do_clocal ||
 610                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 611                         break;
 612                 if (signal_pending(current)) {
 613                         retval = -ERESTARTSYS;
 614                         break;
 615                 }
 616                 schedule();
 617         }
 618         set_current_state(TASK_RUNNING);
 619         remove_wait_queue(&port->port.open_wait, &wait);
 620         if (!tty_hung_up_p(filp))
 621                 port->port.count++;
 622         port->port.blocked_open--;
 623         if (retval)
 624                 return retval;
 625         port->port.flags |= ASYNC_NORMAL_ACTIVE;
 626         return 0;
 627 }
 628
 629 static int mxser_set_baud(struct mxser_port *info, long newspd)
 630 {
 631         int quot = 0, baud;
 632         unsigned char cval;
 633
 634         if (!info->port.tty || !info->port.tty->termios)
 635                 return -1;
 636
 637         if (!(info->ioaddr))
 638                 return -1;
 639
 640         if (newspd > info->max_baud)
 641                 return -1;
 642
 643         if (newspd == 134) {
 644                 quot = 2 * info->baud_base / 269;
 645                 tty_encode_baud_rate(info->port.tty, 134, 134);
 646         } else if (newspd) {
 647                 quot = info->baud_base / newspd;
 648                 if (quot == 0)
 649                         quot = 1;
 650                 baud = info->baud_base/quot;
 651                 tty_encode_baud_rate(info->port.tty, baud, baud);
 652         } else {
 653                 quot = 0;
 654         }
 655
 656         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 657         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 658
 659         if (quot) {
 660                 info->MCR |= UART_MCR_DTR;
 661                 outb(info->MCR, info->ioaddr + UART_MCR);
 662         } else {
 663                 info->MCR &= ~UART_MCR_DTR;
 664                 outb(info->MCR, info->ioaddr + UART_MCR);
 665                 return 0;
 666         }
 667
 668         cval = inb(info->ioaddr + UART_LCR);
 669
 670         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 671
 672         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 673         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 674         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 675
 676 #ifdef BOTHER
 677         if (C_BAUD(info->port.tty) == BOTHER) {
 678                 quot = info->baud_base % newspd;
 679                 quot *= 8;
 680                 if (quot % newspd > newspd / 2) {
 681                         quot /= newspd;
 682                         quot++;
 683                 } else
 684                         quot /= newspd;
 685
 686                 mxser_set_must_enum_value(info->ioaddr, quot);
 687         } else
 688 #endif
 689                 mxser_set_must_enum_value(info->ioaddr, 0);
 690
 691         return 0;
 692 }
 693
 694 /*
 695  * This routine is called to set the UART divisor registers to match
 696  * the specified baud rate for a serial port.
 697  */
 698 static int mxser_change_speed(struct mxser_port *info,
 699                 struct ktermios *old_termios)
 700 {
 701         unsigned cflag, cval, fcr;
 702         int ret = 0;
 703         unsigned char status;
 704
 705         if (!info->port.tty || !info->port.tty->termios)
 706                 return ret;
 707         cflag = info->port.tty->termios->c_cflag;
 708         if (!(info->ioaddr))
 709                 return ret;
 710
 711         if (mxser_set_baud_method[info->port.tty->index] == 0)
 712                 mxser_set_baud(info, tty_get_baud_rate(info->port.tty));
 713
 714         /* byte size and parity */
 715         switch (cflag & CSIZE) {
 716         case CS5:
 717                 cval = 0x00;
 718                 break;
 719         case CS6:
 720                 cval = 0x01;
 721                 break;
 722         case CS7:
 723                 cval = 0x02;
 724                 break;
 725         case CS8:
 726                 cval = 0x03;
 727                 break;
 728         default:
 729                 cval = 0x00;
 730                 break;          /* too keep GCC shut... */
 731         }
 732         if (cflag & CSTOPB)
 733                 cval |= 0x04;
 734         if (cflag & PARENB)
 735                 cval |= UART_LCR_PARITY;
 736         if (!(cflag & PARODD))
 737                 cval |= UART_LCR_EPAR;
 738         if (cflag & CMSPAR)
 739                 cval |= UART_LCR_SPAR;
 740
 741         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 742                 if (info->board->chip_flag) {
 743                         fcr = UART_FCR_ENABLE_FIFO;
 744                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 745                         mxser_set_must_fifo_value(info);
 746                 } else
 747                         fcr = 0;
 748         } else {
 749                 fcr = UART_FCR_ENABLE_FIFO;
 750                 if (info->board->chip_flag) {
 751                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 752                         mxser_set_must_fifo_value(info);
 753                 } else {
 754                         switch (info->rx_trigger) {
 755                         case 1:
 756                                 fcr |= UART_FCR_TRIGGER_1;
 757                                 break;
 758                         case 4:
 759                                 fcr |= UART_FCR_TRIGGER_4;
 760                                 break;
 761                         case 8:
 762                                 fcr |= UART_FCR_TRIGGER_8;
 763                                 break;
 764                         default:
 765                                 fcr |= UART_FCR_TRIGGER_14;
 766                                 break;
 767                         }
 768                 }
 769         }
 770
 771         /* CTS flow control flag and modem status interrupts */
 772         info->IER &= ~UART_IER_MSI;
 773         info->MCR &= ~UART_MCR_AFE;
 774         if (cflag & CRTSCTS) {
 775                 info->port.flags |= ASYNC_CTS_FLOW;
 776                 info->IER |= UART_IER_MSI;
 777                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 778                         info->MCR |= UART_MCR_AFE;
 779                 } else {
 780                         status = inb(info->ioaddr + UART_MSR);
 781                         if (info->port.tty->hw_stopped) {
 782                                 if (status & UART_MSR_CTS) {
 783                                         info->port.tty->hw_stopped = 0;
 784                                         if (info->type != PORT_16550A &&
 785                                                         !info->board->chip_flag) {
 786                                                 outb(info->IER & ~UART_IER_THRI,
 787                                                         info->ioaddr +
 788                                                         UART_IER);
 789                                                 info->IER |= UART_IER_THRI;
 790                                                 outb(info->IER, info->ioaddr +
 791                                                                 UART_IER);
 792                                         }
 793                                         tty_wakeup(info->port.tty);
 794                                 }
 795                         } else {
 796                                 if (!(status & UART_MSR_CTS)) {
 797                                         info->port.tty->hw_stopped = 1;
 798                                         if ((info->type != PORT_16550A) &&
 799                                                         (!info->board->chip_flag)) {
 800                                                 info->IER &= ~UART_IER_THRI;
 801                                                 outb(info->IER, info->ioaddr +
 802                                                                 UART_IER);
 803                                         }
 804                                 }
 805                         }
 806                 }
 807         } else {
 808                 info->port.flags &= ~ASYNC_CTS_FLOW;
 809         }
 810         outb(info->MCR, info->ioaddr + UART_MCR);
 811         if (cflag & CLOCAL) {
 812                 info->port.flags &= ~ASYNC_CHECK_CD;
 813         } else {
 814                 info->port.flags |= ASYNC_CHECK_CD;
 815                 info->IER |= UART_IER_MSI;
 816         }
 817         outb(info->IER, info->ioaddr + UART_IER);
 818
 819         /*
 820          * Set up parity check flag
 821          */
 822         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 823         if (I_INPCK(info->port.tty))
 824                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 825         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
 826                 info->read_status_mask |= UART_LSR_BI;
 827
 828         info->ignore_status_mask = 0;
 829
 830         if (I_IGNBRK(info->port.tty)) {
 831                 info->ignore_status_mask |= UART_LSR_BI;
 832                 info->read_status_mask |= UART_LSR_BI;
 833                 /*
 834                  * If we're ignore parity and break indicators, ignore
 835                  * overruns too.  (For real raw support).
 836                  */
 837                 if (I_IGNPAR(info->port.tty)) {
 838                         info->ignore_status_mask |=
 839                                                 UART_LSR_OE |
 840                                                 UART_LSR_PE |
 841                                                 UART_LSR_FE;
 842                         info->read_status_mask |=
 843                                                 UART_LSR_OE |
 844                                                 UART_LSR_PE |
 845                                                 UART_LSR_FE;
 846                 }
 847         }
 848         if (info->board->chip_flag) {
 849                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(info->port.tty));
 850                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(info->port.tty));
 851                 if (I_IXON(info->port.tty)) {
 852                         mxser_enable_must_rx_software_flow_control(
 853                                         info->ioaddr);
 854                 } else {
 855                         mxser_disable_must_rx_software_flow_control(
 856                                         info->ioaddr);
 857                 }
 858                 if (I_IXOFF(info->port.tty)) {
 859                         mxser_enable_must_tx_software_flow_control(
 860                                         info->ioaddr);
 861                 } else {
 862                         mxser_disable_must_tx_software_flow_control(
 863                                         info->ioaddr);
 864                 }
 865         }
 866
 867
 868         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 869         outb(cval, info->ioaddr + UART_LCR);
 870
 871         return ret;
 872 }
 873
 874 static void mxser_check_modem_status(struct mxser_port *port, int status)
 875 {
 876         /* update input line counters */
 877         if (status & UART_MSR_TERI)
 878                 port->icount.rng++;
 879         if (status & UART_MSR_DDSR)
 880                 port->icount.dsr++;
 881         if (status & UART_MSR_DDCD)
 882                 port->icount.dcd++;
 883         if (status & UART_MSR_DCTS)
 884                 port->icount.cts++;
 885         port->mon_data.modem_status = status;
 886         wake_up_interruptible(&port->delta_msr_wait);
 887
 888         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 889                 if (status & UART_MSR_DCD)
 890                         wake_up_interruptible(&port->port.open_wait);
 891         }
 892
 893         if (port->port.flags & ASYNC_CTS_FLOW) {
 894                 if (port->port.tty->hw_stopped) {
 895                         if (status & UART_MSR_CTS) {
 896                                 port->port.tty->hw_stopped = 0;
 897
 898                                 if ((port->type != PORT_16550A) &&
 899                                                 (!port->board->chip_flag)) {
 900                                         outb(port->IER & ~UART_IER_THRI,
 901                                                 port->ioaddr + UART_IER);
 902                                         port->IER |= UART_IER_THRI;
 903                                         outb(port->IER, port->ioaddr +
 904                                                         UART_IER);
 905                                 }
 906                                 tty_wakeup(port->port.tty);
 907                         }
 908                 } else {
 909                         if (!(status & UART_MSR_CTS)) {
 910                                 port->port.tty->hw_stopped = 1;
 911                                 if (port->type != PORT_16550A &&
 912                                                 !port->board->chip_flag) {
 913                                         port->IER &= ~UART_IER_THRI;
 914                                         outb(port->IER, port->ioaddr +
 915                                                         UART_IER);
 916                                 }
 917                         }
 918                 }
 919         }
 920 }
 921
 922 static int mxser_startup(struct mxser_port *info)
 923 {
 924         unsigned long page;
 925         unsigned long flags;
 926
 927         page = __get_free_page(GFP_KERNEL);
 928         if (!page)
 929                 return -ENOMEM;
 930
 931         spin_lock_irqsave(&info->slock, flags);
 932
 933         if (info->port.flags & ASYNC_INITIALIZED) {
 934                 free_page(page);
 935                 spin_unlock_irqrestore(&info->slock, flags);
 936                 return 0;
 937         }
 938
 939         if (!info->ioaddr || !info->type) {
 940                 if (info->port.tty)
 941                         set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 942                 free_page(page);
 943                 spin_unlock_irqrestore(&info->slock, flags);
 944                 return 0;
 945         }
 946         if (info->port.xmit_buf)
 947                 free_page(page);
 948         else
 949                 info->port.xmit_buf = (unsigned char *) page;
 950
 951         /*
 952          * Clear the FIFO buffers and disable them
 953          * (they will be reenabled in mxser_change_speed())
 954          */
 955         if (info->board->chip_flag)
 956                 outb((UART_FCR_CLEAR_RCVR |
 957                         UART_FCR_CLEAR_XMIT |
 958                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 959         else
 960                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 961                         info->ioaddr + UART_FCR);
 962
 963         /*
 964          * At this point there's no way the LSR could still be 0xFF;
 965          * if it is, then bail out, because there's likely no UART
 966          * here.
 967          */
 968         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 969                 spin_unlock_irqrestore(&info->slock, flags);
 970                 if (capable(CAP_SYS_ADMIN)) {
 971                         if (info->port.tty)
 972                                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 973                         return 0;
 974                 } else
 975                         return -ENODEV;
 976         }
 977
 978         /*
 979          * Clear the interrupt registers.
 980          */
 981         (void) inb(info->ioaddr + UART_LSR);
 982         (void) inb(info->ioaddr + UART_RX);
 983         (void) inb(info->ioaddr + UART_IIR);
 984         (void) inb(info->ioaddr + UART_MSR);
 985
 986         /*
 987          * Now, initialize the UART
 988          */
 989         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 990         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 991         outb(info->MCR, info->ioaddr + UART_MCR);
 992
 993         /*
 994          * Finally, enable interrupts
 995          */
 996         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 997
 998         if (info->board->chip_flag)
 999                 info->IER |= MOXA_MUST_IER_EGDAI;
1000         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
1001
1002         /*
1003          * And clear the interrupt registers again for luck.
1004          */
1005         (void) inb(info->ioaddr + UART_LSR);
1006         (void) inb(info->ioaddr + UART_RX);
1007         (void) inb(info->ioaddr + UART_IIR);
1008         (void) inb(info->ioaddr + UART_MSR);
1009
1010         if (info->port.tty)
1011                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1012         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1013
1014         /*
1015          * and set the speed of the serial port
1016          */
1017         mxser_change_speed(info, NULL);
1018         info->port.flags |= ASYNC_INITIALIZED;
1019         spin_unlock_irqrestore(&info->slock, flags);
1020
1021         return 0;
1022 }
1023
1024 /*
1025  * This routine will shutdown a serial port; interrupts maybe disabled, and
1026  * DTR is dropped if the hangup on close termio flag is on.
1027  */
1028 static void mxser_shutdown(struct mxser_port *info)
1029 {
1030         unsigned long flags;
1031
1032         if (!(info->port.flags & ASYNC_INITIALIZED))
1033                 return;
1034
1035         spin_lock_irqsave(&info->slock, flags);
1036
1037         /*
1038          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1039          * here so the queue might never be waken up
1040          */
1041         wake_up_interruptible(&info->delta_msr_wait);
1042
1043         /*
1044          * Free the IRQ, if necessary
1045          */
1046         if (info->port.xmit_buf) {
1047                 free_page((unsigned long) info->port.xmit_buf);
1048                 info->port.xmit_buf = NULL;
1049         }
1050
1051         info->IER = 0;
1052         outb(0x00, info->ioaddr + UART_IER);
1053
1054         if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
1055                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1056         outb(info->MCR, info->ioaddr + UART_MCR);
1057
1058         /* clear Rx/Tx FIFO's */
1059         if (info->board->chip_flag)
1060                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1061                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1062                                 info->ioaddr + UART_FCR);
1063         else
1064                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1065                         info->ioaddr + UART_FCR);
1066
1067         /* read data port to reset things */
1068         (void) inb(info->ioaddr + UART_RX);
1069
1070         if (info->port.tty)
1071                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1072
1073         info->port.flags &= ~ASYNC_INITIALIZED;
1074
1075         if (info->board->chip_flag)
1076                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1077
1078         spin_unlock_irqrestore(&info->slock, flags);
1079 }
1080
1081 /*
1082  * This routine is called whenever a serial port is opened.  It
1083  * enables interrupts for a serial port, linking in its async structure into
1084  * the IRQ chain.   It also performs the serial-specific
1085  * initialization for the tty structure.
1086  */
1087 static int mxser_open(struct tty_struct *tty, struct file *filp)
1088 {
1089         struct mxser_port *info;
1090         unsigned long flags;
1091         int retval, line;
1092
1093         line = tty->index;
1094         if (line == MXSER_PORTS)
1095                 return 0;
1096         if (line < 0 || line > MXSER_PORTS)
1097                 return -ENODEV;
1098         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1099         if (!info->ioaddr)
1100                 return -ENODEV;
1101
1102         tty->driver_data = info;
1103         info->port.tty = tty;
1104         /*
1105          * Start up serial port
1106          */
1107         spin_lock_irqsave(&info->slock, flags);
1108         info->port.count++;
1109         spin_unlock_irqrestore(&info->slock, flags);
1110         retval = mxser_startup(info);
1111         if (retval)
1112                 return retval;
1113
1114         retval = mxser_block_til_ready(tty, filp, info);
1115         if (retval)
1116                 return retval;
1117
1118         /* unmark here for very high baud rate (ex. 921600 bps) used */
1119         tty->low_latency = 1;
1120         return 0;
1121 }
1122
1123 static void mxser_flush_buffer(struct tty_struct *tty)
1124 {
1125         struct mxser_port *info = tty->driver_data;
1126         char fcr;
1127         unsigned long flags;
1128
1129
1130         spin_lock_irqsave(&info->slock, flags);
1131         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1132
1133         fcr = inb(info->ioaddr + UART_FCR);
1134         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1135                 info->ioaddr + UART_FCR);
1136         outb(fcr, info->ioaddr + UART_FCR);
1137
1138         spin_unlock_irqrestore(&info->slock, flags);
1139
1140         tty_wakeup(tty);
1141 }
1142
1143
1144 /*
1145  * This routine is called when the serial port gets closed.  First, we
1146  * wait for the last remaining data to be sent.  Then, we unlink its
1147  * async structure from the interrupt chain if necessary, and we free
1148  * that IRQ if nothing is left in the chain.
1149  */
1150 static void mxser_close(struct tty_struct *tty, struct file *filp)
1151 {
1152         struct mxser_port *info = tty->driver_data;
1153
1154         unsigned long timeout;
1155         unsigned long flags;
1156
1157         if (tty->index == MXSER_PORTS)
1158                 return;
1159         if (!info)
1160                 return;
1161
1162         spin_lock_irqsave(&info->slock, flags);
1163
1164         if (tty_hung_up_p(filp)) {
1165                 spin_unlock_irqrestore(&info->slock, flags);
1166                 return;
1167         }
1168         if ((tty->count == 1) && (info->port.count != 1)) {
1169                 /*
1170                  * Uh, oh.  tty->count is 1, which means that the tty
1171                  * structure will be freed.  Info->port.count should always
1172                  * be one in these conditions.  If it's greater than
1173                  * one, we've got real problems, since it means the
1174                  * serial port won't be shutdown.
1175                  */
1176                 printk(KERN_ERR "mxser_close: bad serial port count; "
1177                         "tty->count is 1, info->port.count is %d\n", info->port.count);
1178                 info->port.count = 1;
1179         }
1180         if (--info->port.count < 0) {
1181                 printk(KERN_ERR "mxser_close: bad serial port count for "
1182                         "ttys%d: %d\n", tty->index, info->port.count);
1183                 info->port.count = 0;
1184         }
1185         if (info->port.count) {
1186                 spin_unlock_irqrestore(&info->slock, flags);
1187                 return;
1188         }
1189         info->port.flags |= ASYNC_CLOSING;
1190         spin_unlock_irqrestore(&info->slock, flags);
1191         /*
1192          * Save the termios structure, since this port may have
1193          * separate termios for callout and dialin.
1194          */
1195         if (info->port.flags & ASYNC_NORMAL_ACTIVE)
1196                 info->normal_termios = *tty->termios;
1197         /*
1198          * Now we wait for the transmit buffer to clear; and we notify
1199          * the line discipline to only process XON/XOFF characters.
1200          */
1201         tty->closing = 1;
1202         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1203                 tty_wait_until_sent(tty, info->closing_wait);
1204         /*
1205          * At this point we stop accepting input.  To do this, we
1206          * disable the receive line status interrupts, and tell the
1207          * interrupt driver to stop checking the data ready bit in the
1208          * line status register.
1209          */
1210         info->IER &= ~UART_IER_RLSI;
1211         if (info->board->chip_flag)
1212                 info->IER &= ~MOXA_MUST_RECV_ISR;
1213
1214         if (info->port.flags & ASYNC_INITIALIZED) {
1215                 outb(info->IER, info->ioaddr + UART_IER);
1216                 /*
1217                  * Before we drop DTR, make sure the UART transmitter
1218                  * has completely drained; this is especially
1219                  * important if there is a transmit FIFO!
1220                  */
1221                 timeout = jiffies + HZ;
1222                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1223                         schedule_timeout_interruptible(5);
1224                         if (time_after(jiffies, timeout))
1225                                 break;
1226                 }
1227         }
1228         mxser_shutdown(info);
1229
1230         mxser_flush_buffer(tty);
1231         tty_ldisc_flush(tty);
1232
1233         tty->closing = 0;
1234         info->event = 0;
1235         info->port.tty = NULL;
1236         if (info->port.blocked_open) {
1237                 if (info->close_delay)
1238                         schedule_timeout_interruptible(info->close_delay);
1239                 wake_up_interruptible(&info->port.open_wait);
1240         }
1241
1242         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1243 }
1244
1245 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1246 {
1247         int c, total = 0;
1248         struct mxser_port *info = tty->driver_data;
1249         unsigned long flags;
1250
1251         if (!info->port.xmit_buf)
1252                 return 0;
1253
1254         while (1) {
1255                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1256                                           SERIAL_XMIT_SIZE - info->xmit_head));
1257                 if (c <= 0)
1258                         break;
1259
1260                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1261                 spin_lock_irqsave(&info->slock, flags);
1262                 info->xmit_head = (info->xmit_head + c) &
1263                                   (SERIAL_XMIT_SIZE - 1);
1264                 info->xmit_cnt += c;
1265                 spin_unlock_irqrestore(&info->slock, flags);
1266
1267                 buf += c;
1268                 count -= c;
1269                 total += c;
1270         }
1271
1272         if (info->xmit_cnt && !tty->stopped) {
1273                 if (!tty->hw_stopped ||
1274                                 (info->type == PORT_16550A) ||
1275                                 (info->board->chip_flag)) {
1276                         spin_lock_irqsave(&info->slock, flags);
1277                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1278                                         UART_IER);
1279                         info->IER |= UART_IER_THRI;
1280                         outb(info->IER, info->ioaddr + UART_IER);
1281                         spin_unlock_irqrestore(&info->slock, flags);
1282                 }
1283         }
1284         return total;
1285 }
1286
1287 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1288 {
1289         struct mxser_port *info = tty->driver_data;
1290         unsigned long flags;
1291
1292         if (!info->port.xmit_buf)
1293                 return 0;
1294
1295         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1296                 return 0;
1297
1298         spin_lock_irqsave(&info->slock, flags);
1299         info->port.xmit_buf[info->xmit_head++] = ch;
1300         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1301         info->xmit_cnt++;
1302         spin_unlock_irqrestore(&info->slock, flags);
1303         if (!tty->stopped) {
1304                 if (!tty->hw_stopped ||
1305                                 (info->type == PORT_16550A) ||
1306                                 info->board->chip_flag) {
1307                         spin_lock_irqsave(&info->slock, flags);
1308                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1309                         info->IER |= UART_IER_THRI;
1310                         outb(info->IER, info->ioaddr + UART_IER);
1311                         spin_unlock_irqrestore(&info->slock, flags);
1312                 }
1313         }
1314         return 1;
1315 }
1316
1317
1318 static void mxser_flush_chars(struct tty_struct *tty)
1319 {
1320         struct mxser_port *info = tty->driver_data;
1321         unsigned long flags;
1322
1323         if (info->xmit_cnt <= 0 ||
1324                         tty->stopped ||
1325                         !info->port.xmit_buf ||
1326                         (tty->hw_stopped &&
1327                          (info->type != PORT_16550A) &&
1328                          (!info->board->chip_flag)
1329                         ))
1330                 return;
1331
1332         spin_lock_irqsave(&info->slock, flags);
1333
1334         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1335         info->IER |= UART_IER_THRI;
1336         outb(info->IER, info->ioaddr + UART_IER);
1337
1338         spin_unlock_irqrestore(&info->slock, flags);
1339 }
1340
1341 static int mxser_write_room(struct tty_struct *tty)
1342 {
1343         struct mxser_port *info = tty->driver_data;
1344         int ret;
1345
1346         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1347         if (ret < 0)
1348                 ret = 0;
1349         return ret;
1350 }
1351
1352 static int mxser_chars_in_buffer(struct tty_struct *tty)
1353 {
1354         struct mxser_port *info = tty->driver_data;
1355         return info->xmit_cnt;
1356 }
1357
1358 /*
1359  * ------------------------------------------------------------
1360  * friends of mxser_ioctl()
1361  * ------------------------------------------------------------
1362  */
1363 static int mxser_get_serial_info(struct mxser_port *info,
1364                 struct serial_struct __user *retinfo)
1365 {
1366         struct serial_struct tmp = {
1367                 .type = info->type,
1368                 .line = info->port.tty->index,
1369                 .port = info->ioaddr,
1370                 .irq = info->board->irq,
1371                 .flags = info->port.flags,
1372                 .baud_base = info->baud_base,
1373                 .close_delay = info->close_delay,
1374                 .closing_wait = info->closing_wait,
1375                 .custom_divisor = info->custom_divisor,
1376                 .hub6 = 0
1377         };
1378         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1379                 return -EFAULT;
1380         return 0;
1381 }
1382
1383 static int mxser_set_serial_info(struct mxser_port *info,
1384                 struct serial_struct __user *new_info)
1385 {
1386         struct serial_struct new_serial;
1387         speed_t baud;
1388         unsigned long sl_flags;
1389         unsigned int flags;
1390         int retval = 0;
1391
1392         if (!new_info || !info->ioaddr)
1393                 return -ENODEV;
1394         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1395                 return -EFAULT;
1396
1397         if (new_serial.irq != info->board->irq ||
1398                         new_serial.port != info->ioaddr)
1399                 return -EINVAL;
1400
1401         flags = info->port.flags & ASYNC_SPD_MASK;
1402
1403         if (!capable(CAP_SYS_ADMIN)) {
1404                 if ((new_serial.baud_base != info->baud_base) ||
1405                                 (new_serial.close_delay != info->close_delay) ||
1406                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1407                         return -EPERM;
1408                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1409                                 (new_serial.flags & ASYNC_USR_MASK));
1410         } else {
1411                 /*
1412                  * OK, past this point, all the error checking has been done.
1413                  * At this point, we start making changes.....
1414                  */
1415                 info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
1416                                 (new_serial.flags & ASYNC_FLAGS));
1417                 info->close_delay = new_serial.close_delay * HZ / 100;
1418                 info->closing_wait = new_serial.closing_wait * HZ / 100;
1419                 info->port.tty->low_latency =
1420                                 (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1421                 info->port.tty->low_latency = 0;
1422                 if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1423                                 (new_serial.baud_base != info->baud_base ||
1424                                 new_serial.custom_divisor !=
1425                                 info->custom_divisor)) {
1426                         baud = new_serial.baud_base / new_serial.custom_divisor;
1427                         tty_encode_baud_rate(info->port.tty, baud, baud);
1428                 }
1429         }
1430
1431         info->type = new_serial.type;
1432
1433         process_txrx_fifo(info);
1434
1435         if (info->port.flags & ASYNC_INITIALIZED) {
1436                 if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
1437                         spin_lock_irqsave(&info->slock, sl_flags);
1438                         mxser_change_speed(info, NULL);
1439                         spin_unlock_irqrestore(&info->slock, sl_flags);
1440                 }
1441         } else
1442                 retval = mxser_startup(info);
1443
1444         return retval;
1445 }
1446
1447 /*
1448  * mxser_get_lsr_info - get line status register info
1449  *
1450  * Purpose: Let user call ioctl() to get info when the UART physically
1451  *          is emptied.  On bus types like RS485, the transmitter must
1452  *          release the bus after transmitting. This must be done when
1453  *          the transmit shift register is empty, not be done when the
1454  *          transmit holding register is empty.  This functionality
1455  *          allows an RS485 driver to be written in user space.
1456  */
1457 static int mxser_get_lsr_info(struct mxser_port *info,
1458                 unsigned int __user *value)
1459 {
1460         unsigned char status;
1461         unsigned int result;
1462         unsigned long flags;
1463
1464         spin_lock_irqsave(&info->slock, flags);
1465         status = inb(info->ioaddr + UART_LSR);
1466         spin_unlock_irqrestore(&info->slock, flags);
1467         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1468         return put_user(result, value);
1469 }
1470
1471 /*
1472  * This routine sends a break character out the serial port.
1473  */
1474 static void mxser_send_break(struct mxser_port *info, int duration)
1475 {
1476         unsigned long flags;
1477
1478         if (!info->ioaddr)
1479                 return;
1480         set_current_state(TASK_INTERRUPTIBLE);
1481         spin_lock_irqsave(&info->slock, flags);
1482         outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
1483                 info->ioaddr + UART_LCR);
1484         spin_unlock_irqrestore(&info->slock, flags);
1485         schedule_timeout(duration);
1486         spin_lock_irqsave(&info->slock, flags);
1487         outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
1488                 info->ioaddr + UART_LCR);
1489         spin_unlock_irqrestore(&info->slock, flags);
1490 }
1491
1492 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1493 {
1494         struct mxser_port *info = tty->driver_data;
1495         unsigned char control, status;
1496         unsigned long flags;
1497
1498
1499         if (tty->index == MXSER_PORTS)
1500                 return -ENOIOCTLCMD;
1501         if (test_bit(TTY_IO_ERROR, &tty->flags))
1502                 return -EIO;
1503
1504         control = info->MCR;
1505
1506         spin_lock_irqsave(&info->slock, flags);
1507         status = inb(info->ioaddr + UART_MSR);
1508         if (status & UART_MSR_ANY_DELTA)
1509                 mxser_check_modem_status(info, status);
1510         spin_unlock_irqrestore(&info->slock, flags);
1511         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1512                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1513                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1514                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1515                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1516                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1517 }
1518
1519 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1520                 unsigned int set, unsigned int clear)
1521 {
1522         struct mxser_port *info = tty->driver_data;
1523         unsigned long flags;
1524
1525
1526         if (tty->index == MXSER_PORTS)
1527                 return -ENOIOCTLCMD;
1528         if (test_bit(TTY_IO_ERROR, &tty->flags))
1529                 return -EIO;
1530
1531         spin_lock_irqsave(&info->slock, flags);
1532
1533         if (set & TIOCM_RTS)
1534                 info->MCR |= UART_MCR_RTS;
1535         if (set & TIOCM_DTR)
1536                 info->MCR |= UART_MCR_DTR;
1537
1538         if (clear & TIOCM_RTS)
1539                 info->MCR &= ~UART_MCR_RTS;
1540         if (clear & TIOCM_DTR)
1541                 info->MCR &= ~UART_MCR_DTR;
1542
1543         outb(info->MCR, info->ioaddr + UART_MCR);
1544         spin_unlock_irqrestore(&info->slock, flags);
1545         return 0;
1546 }
1547
1548 static int __init mxser_program_mode(int port)
1549 {
1550         int id, i, j, n;
1551
1552         outb(0, port);
1553         outb(0, port);
1554         outb(0, port);
1555         (void)inb(port);
1556         (void)inb(port);
1557         outb(0, port);
1558         (void)inb(port);
1559
1560         id = inb(port + 1) & 0x1F;
1561         if ((id != C168_ASIC_ID) &&
1562                         (id != C104_ASIC_ID) &&
1563                         (id != C102_ASIC_ID) &&
1564                         (id != CI132_ASIC_ID) &&
1565                         (id != CI134_ASIC_ID) &&
1566                         (id != CI104J_ASIC_ID))
1567                 return -1;
1568         for (i = 0, j = 0; i < 4; i++) {
1569                 n = inb(port + 2);
1570                 if (n == 'M') {
1571                         j = 1;
1572                 } else if ((j == 1) && (n == 1)) {
1573                         j = 2;
1574                         break;
1575                 } else
1576                         j = 0;
1577         }
1578         if (j != 2)
1579                 id = -2;
1580         return id;
1581 }
1582
1583 static void __init mxser_normal_mode(int port)
1584 {
1585         int i, n;
1586
1587         outb(0xA5, port + 1);
1588         outb(0x80, port + 3);
1589         outb(12, port + 0);     /* 9600 bps */
1590         outb(0, port + 1);
1591         outb(0x03, port + 3);   /* 8 data bits */
1592         outb(0x13, port + 4);   /* loop back mode */
1593         for (i = 0; i < 16; i++) {
1594                 n = inb(port + 5);
1595                 if ((n & 0x61) == 0x60)
1596                         break;
1597                 if ((n & 1) == 1)
1598                         (void)inb(port);
1599         }
1600         outb(0x00, port + 4);
1601 }
1602
1603 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1604 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1605 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1606 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1607 #define EN_CCMD         0x000   /* Chip's command register     */
1608 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1609 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1610 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1611 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1612 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1613 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1614 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1615 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1616 static int __init mxser_read_register(int port, unsigned short *regs)
1617 {
1618         int i, k, value, id;
1619         unsigned int j;
1620
1621         id = mxser_program_mode(port);
1622         if (id < 0)
1623                 return id;
1624         for (i = 0; i < 14; i++) {
1625                 k = (i & 0x3F) | 0x180;
1626                 for (j = 0x100; j > 0; j >>= 1) {
1627                         outb(CHIP_CS, port);
1628                         if (k & j) {
1629                                 outb(CHIP_CS | CHIP_DO, port);
1630                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1631                         } else {
1632                                 outb(CHIP_CS, port);
1633                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1634                         }
1635                 }
1636                 (void)inb(port);
1637                 value = 0;
1638                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1639                         outb(CHIP_CS, port);
1640                         outb(CHIP_CS | CHIP_SK, port);
1641                         if (inb(port) & CHIP_DI)
1642                                 value |= j;
1643                 }
1644                 regs[i] = value;
1645                 outb(0, port);
1646         }
1647         mxser_normal_mode(port);
1648         return id;
1649 }
1650
1651 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1652 {
1653         struct mxser_port *port;
1654         int result, status;
1655         unsigned int i, j;
1656         int ret = 0;
1657
1658         switch (cmd) {
1659         case MOXA_GET_MAJOR:
1660                 return put_user(ttymajor, (int __user *)argp);
1661
1662         case MOXA_CHKPORTENABLE:
1663                 result = 0;
1664                 lock_kernel();
1665                 for (i = 0; i < MXSER_BOARDS; i++)
1666                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1667                                 if (mxser_boards[i].ports[j].ioaddr)
1668                                         result |= (1 << i);
1669                 unlock_kernel();
1670                 return put_user(result, (unsigned long __user *)argp);
1671         case MOXA_GETDATACOUNT:
1672                 lock_kernel();
1673                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1674                         ret = -EFAULT;
1675                 unlock_kernel();
1676                 return ret;
1677         case MOXA_GETMSTATUS:
1678                 lock_kernel();
1679                 for (i = 0; i < MXSER_BOARDS; i++)
1680                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1681                                 port = &mxser_boards[i].ports[j];
1682
1683                                 GMStatus[i].ri = 0;
1684                                 if (!port->ioaddr) {
1685                                         GMStatus[i].dcd = 0;
1686                                         GMStatus[i].dsr = 0;
1687                                         GMStatus[i].cts = 0;
1688                                         continue;
1689                                 }
1690
1691                                 if (!port->port.tty || !port->port.tty->termios)
1692                                         GMStatus[i].cflag =
1693                                                 port->normal_termios.c_cflag;
1694                                 else
1695                                         GMStatus[i].cflag =
1696                                                 port->port.tty->termios->c_cflag;
1697
1698                                 status = inb(port->ioaddr + UART_MSR);
1699                                 if (status & 0x80 /*UART_MSR_DCD */ )
1700                                         GMStatus[i].dcd = 1;
1701                                 else
1702                                         GMStatus[i].dcd = 0;
1703
1704                                 if (status & 0x20 /*UART_MSR_DSR */ )
1705                                         GMStatus[i].dsr = 1;
1706                                 else
1707                                         GMStatus[i].dsr = 0;
1708
1709
1710                                 if (status & 0x10 /*UART_MSR_CTS */ )
1711                                         GMStatus[i].cts = 1;
1712                                 else
1713                                         GMStatus[i].cts = 0;
1714                         }
1715                 unlock_kernel();
1716                 if (copy_to_user(argp, GMStatus,
1717                                 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1718                         return -EFAULT;
1719                 return 0;
1720         case MOXA_ASPP_MON_EXT: {
1721                 int p, shiftbit;
1722                 unsigned long opmode;
1723                 unsigned cflag, iflag;
1724
1725                 lock_kernel();
1726                 for (i = 0; i < MXSER_BOARDS; i++) {
1727                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1728                                 port = &mxser_boards[i].ports[j];
1729                                 if (!port->ioaddr)
1730                                         continue;
1731
1732                                 status = mxser_get_msr(port->ioaddr, 0, i);
1733
1734                                 if (status & UART_MSR_TERI)
1735                                         port->icount.rng++;
1736                                 if (status & UART_MSR_DDSR)
1737                                         port->icount.dsr++;
1738                                 if (status & UART_MSR_DDCD)
1739                                         port->icount.dcd++;
1740                                 if (status & UART_MSR_DCTS)
1741                                         port->icount.cts++;
1742
1743                                 port->mon_data.modem_status = status;
1744                                 mon_data_ext.rx_cnt[i] = port->mon_data.rxcnt;
1745                                 mon_data_ext.tx_cnt[i] = port->mon_data.txcnt;
1746                                 mon_data_ext.up_rxcnt[i] =
1747                                         port->mon_data.up_rxcnt;
1748                                 mon_data_ext.up_txcnt[i] =
1749                                         port->mon_data.up_txcnt;
1750                                 mon_data_ext.modem_status[i] =
1751                                         port->mon_data.modem_status;
1752                                 mon_data_ext.baudrate[i] =
1753                                         tty_get_baud_rate(port->port.tty);
1754
1755                                 if (!port->port.tty || !port->port.tty->termios) {
1756                                         cflag = port->normal_termios.c_cflag;
1757                                         iflag = port->normal_termios.c_iflag;
1758                                 } else {
1759                                         cflag = port->port.tty->termios->c_cflag;
1760                                         iflag = port->port.tty->termios->c_iflag;
1761                                 }
1762
1763                                 mon_data_ext.databits[i] = cflag & CSIZE;
1764
1765                                 mon_data_ext.stopbits[i] = cflag & CSTOPB;
1766
1767                                 mon_data_ext.parity[i] =
1768                                         cflag & (PARENB | PARODD | CMSPAR);
1769
1770                                 mon_data_ext.flowctrl[i] = 0x00;
1771
1772                                 if (cflag & CRTSCTS)
1773                                         mon_data_ext.flowctrl[i] |= 0x03;
1774
1775                                 if (iflag & (IXON | IXOFF))
1776                                         mon_data_ext.flowctrl[i] |= 0x0C;
1777
1778                                 if (port->type == PORT_16550A)
1779                                         mon_data_ext.fifo[i] = 1;
1780                                 else
1781                                         mon_data_ext.fifo[i] = 0;
1782
1783                                 p = i % 4;
1784                                 shiftbit = p * 2;
1785                                 opmode = inb(port->opmode_ioaddr) >> shiftbit;
1786                                 opmode &= OP_MODE_MASK;
1787
1788                                 mon_data_ext.iftype[i] = opmode;
1789
1790                         }
1791                 }
1792                 unlock_kernel();
1793                 if (copy_to_user(argp, &mon_data_ext,
1794                                         sizeof(mon_data_ext)))
1795                         return -EFAULT;
1796                 return 0;
1797         }
1798         default:
1799                 return -ENOIOCTLCMD;
1800         }
1801         return 0;
1802 }
1803
1804 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1805                 struct async_icount *cprev)
1806 {
1807         struct async_icount cnow;
1808         unsigned long flags;
1809         int ret;
1810
1811         spin_lock_irqsave(&info->slock, flags);
1812         cnow = info->icount;    /* atomic copy */
1813         spin_unlock_irqrestore(&info->slock, flags);
1814
1815         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1816                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1817                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1818                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1819
1820         *cprev = cnow;
1821
1822         return ret;
1823 }
1824
1825 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1826                 unsigned int cmd, unsigned long arg)
1827 {
1828         struct mxser_port *info = tty->driver_data;
1829         struct async_icount cnow;
1830         struct serial_icounter_struct __user *p_cuser;
1831         unsigned long flags;
1832         void __user *argp = (void __user *)arg;
1833         int retval;
1834
1835         if (tty->index == MXSER_PORTS)
1836                 return mxser_ioctl_special(cmd, argp);
1837
1838         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1839                 int p;
1840                 unsigned long opmode;
1841                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1842                 int shiftbit;
1843                 unsigned char val, mask;
1844
1845                 p = tty->index % 4;
1846                 if (cmd == MOXA_SET_OP_MODE) {
1847                         if (get_user(opmode, (int __user *) argp))
1848                                 return -EFAULT;
1849                         if (opmode != RS232_MODE &&
1850                                         opmode != RS485_2WIRE_MODE &&
1851                                         opmode != RS422_MODE &&
1852                                         opmode != RS485_4WIRE_MODE)
1853                                 return -EFAULT;
1854                         lock_kernel();
1855                         mask = ModeMask[p];
1856                         shiftbit = p * 2;
1857                         val = inb(info->opmode_ioaddr);
1858                         val &= mask;
1859                         val |= (opmode << shiftbit);
1860                         outb(val, info->opmode_ioaddr);
1861                         unlock_kernel();
1862                 } else {
1863                         lock_kernel();
1864                         shiftbit = p * 2;
1865                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1866                         opmode &= OP_MODE_MASK;
1867                         unlock_kernel();
1868                         if (put_user(opmode, (int __user *)argp))
1869                                 return -EFAULT;
1870                 }
1871                 return 0;
1872         }
1873
1874         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1875                         test_bit(TTY_IO_ERROR, &tty->flags))
1876                 return -EIO;
1877
1878         switch (cmd) {
1879         case TCSBRK:            /* SVID version: non-zero arg --> no break */
1880                 retval = tty_check_change(tty);
1881                 if (retval)
1882                         return retval;
1883                 tty_wait_until_sent(tty, 0);
1884                 if (!arg)
1885                         mxser_send_break(info, HZ / 4); /* 1/4 second */
1886                 return 0;
1887         case TCSBRKP:           /* support for POSIX tcsendbreak() */
1888                 retval = tty_check_change(tty);
1889                 if (retval)
1890                         return retval;
1891                 tty_wait_until_sent(tty, 0);
1892                 mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1893                 return 0;
1894         case TIOCGSERIAL:
1895                 lock_kernel();
1896                 retval = mxser_get_serial_info(info, argp);
1897                 unlock_kernel();
1898                 return retval;
1899         case TIOCSSERIAL:
1900                 lock_kernel();
1901                 retval = mxser_set_serial_info(info, argp);
1902                 unlock_kernel();
1903                 return retval;
1904         case TIOCSERGETLSR:     /* Get line status register */
1905                 return  mxser_get_lsr_info(info, argp);
1906                 /*
1907                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1908                  * - mask passed in arg for lines of interest
1909                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1910                  * Caller should use TIOCGICOUNT to see which one it was
1911                  */
1912         case TIOCMIWAIT:
1913                 spin_lock_irqsave(&info->slock, flags);
1914                 cnow = info->icount;    /* note the counters on entry */
1915                 spin_unlock_irqrestore(&info->slock, flags);
1916
1917                 return wait_event_interruptible(info->delta_msr_wait,
1918                                 mxser_cflags_changed(info, arg, &cnow));
1919         /*
1920          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1921          * Return: write counters to the user passed counter struct
1922          * NB: both 1->0 and 0->1 transitions are counted except for
1923          *     RI where only 0->1 is counted.
1924          */
1925         case TIOCGICOUNT:
1926                 spin_lock_irqsave(&info->slock, flags);
1927                 cnow = info->icount;
1928                 spin_unlock_irqrestore(&info->slock, flags);
1929                 p_cuser = argp;
1930                 if (put_user(cnow.frame, &p_cuser->frame))
1931                         return -EFAULT;
1932                 if (put_user(cnow.brk, &p_cuser->brk))
1933                         return -EFAULT;
1934                 if (put_user(cnow.overrun, &p_cuser->overrun))
1935                         return -EFAULT;
1936                 if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1937                         return -EFAULT;
1938                 if (put_user(cnow.parity, &p_cuser->parity))
1939                         return -EFAULT;
1940                 if (put_user(cnow.rx, &p_cuser->rx))
1941                         return -EFAULT;
1942                 if (put_user(cnow.tx, &p_cuser->tx))
1943                         return -EFAULT;
1944                 put_user(cnow.cts, &p_cuser->cts);
1945                 put_user(cnow.dsr, &p_cuser->dsr);
1946                 put_user(cnow.rng, &p_cuser->rng);
1947                 put_user(cnow.dcd, &p_cuser->dcd);
1948                 return 0;
1949         case MOXA_HighSpeedOn:
1950                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1951         case MOXA_SDS_RSTICOUNTER:
1952                 lock_kernel();
1953                 info->mon_data.rxcnt = 0;
1954                 info->mon_data.txcnt = 0;
1955                 unlock_kernel();
1956                 return 0;
1957
1958         case MOXA_ASPP_OQUEUE:{
1959                 int len, lsr;
1960
1961                 lock_kernel();
1962                 len = mxser_chars_in_buffer(tty);
1963                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1964                 len += (lsr ? 0 : 1);
1965                 unlock_kernel();
1966
1967                 return put_user(len, (int __user *)argp);
1968         }
1969         case MOXA_ASPP_MON: {
1970                 int mcr, status;
1971
1972                 lock_kernel();
1973                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1974                 mxser_check_modem_status(info, status);
1975
1976                 mcr = inb(info->ioaddr + UART_MCR);
1977                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1978                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1979                 else
1980                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1981
1982                 if (mcr & MOXA_MUST_MCR_TX_XON)
1983                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1984                 else
1985                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1986
1987                 if (info->port.tty->hw_stopped)
1988                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1989                 else
1990                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1991                 unlock_kernel();
1992                 if (copy_to_user(argp, &info->mon_data,
1993                                 sizeof(struct mxser_mon)))
1994                         return -EFAULT;
1995
1996                 return 0;
1997         }
1998         case MOXA_ASPP_LSTATUS: {
1999                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
2000                         return -EFAULT;
2001
2002                 info->err_shadow = 0;
2003                 return 0;
2004         }
2005         case MOXA_SET_BAUD_METHOD: {
2006                 int method;
2007
2008                 if (get_user(method, (int __user *)argp))
2009                         return -EFAULT;
2010                 mxser_set_baud_method[tty->index] = method;
2011                 return put_user(method, (int __user *)argp);
2012         }
2013         default:
2014                 return -ENOIOCTLCMD;
2015         }
2016         return 0;
2017 }
2018
2019 static void mxser_stoprx(struct tty_struct *tty)
2020 {
2021         struct mxser_port *info = tty->driver_data;
2022
2023         info->ldisc_stop_rx = 1;
2024         if (I_IXOFF(tty)) {
2025                 if (info->board->chip_flag) {
2026                         info->IER &= ~MOXA_MUST_RECV_ISR;
2027                         outb(info->IER, info->ioaddr + UART_IER);
2028                 } else {
2029                         info->x_char = STOP_CHAR(tty);
2030                         outb(0, info->ioaddr + UART_IER);
2031                         info->IER |= UART_IER_THRI;
2032                         outb(info->IER, info->ioaddr + UART_IER);
2033                 }
2034         }
2035
2036         if (info->port.tty->termios->c_cflag & CRTSCTS) {
2037                 info->MCR &= ~UART_MCR_RTS;
2038                 outb(info->MCR, info->ioaddr + UART_MCR);
2039         }
2040 }
2041
2042 /*
2043  * This routine is called by the upper-layer tty layer to signal that
2044  * incoming characters should be throttled.
2045  */
2046 static void mxser_throttle(struct tty_struct *tty)
2047 {
2048         mxser_stoprx(tty);
2049 }
2050
2051 static void mxser_unthrottle(struct tty_struct *tty)
2052 {
2053         struct mxser_port *info = tty->driver_data;
2054
2055         /* startrx */
2056         info->ldisc_stop_rx = 0;
2057         if (I_IXOFF(tty)) {
2058                 if (info->x_char)
2059                         info->x_char = 0;
2060                 else {
2061                         if (info->board->chip_flag) {
2062                                 info->IER |= MOXA_MUST_RECV_ISR;
2063                                 outb(info->IER, info->ioaddr + UART_IER);
2064                         } else {
2065                                 info->x_char = START_CHAR(tty);
2066                                 outb(0, info->ioaddr + UART_IER);
2067                                 info->IER |= UART_IER_THRI;
2068                                 outb(info->IER, info->ioaddr + UART_IER);
2069                         }
2070                 }
2071         }
2072
2073         if (info->port.tty->termios->c_cflag & CRTSCTS) {
2074                 info->MCR |= UART_MCR_RTS;
2075                 outb(info->MCR, info->ioaddr + UART_MCR);
2076         }
2077 }
2078
2079 /*
2080  * mxser_stop() and mxser_start()
2081  *
2082  * This routines are called before setting or resetting tty->stopped.
2083  * They enable or disable transmitter interrupts, as necessary.
2084  */
2085 static void mxser_stop(struct tty_struct *tty)
2086 {
2087         struct mxser_port *info = tty->driver_data;
2088         unsigned long flags;
2089
2090         spin_lock_irqsave(&info->slock, flags);
2091         if (info->IER & UART_IER_THRI) {
2092                 info->IER &= ~UART_IER_THRI;
2093                 outb(info->IER, info->ioaddr + UART_IER);
2094         }
2095         spin_unlock_irqrestore(&info->slock, flags);
2096 }
2097
2098 static void mxser_start(struct tty_struct *tty)
2099 {
2100         struct mxser_port *info = tty->driver_data;
2101         unsigned long flags;
2102
2103         spin_lock_irqsave(&info->slock, flags);
2104         if (info->xmit_cnt && info->port.xmit_buf) {
2105                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2106                 info->IER |= UART_IER_THRI;
2107                 outb(info->IER, info->ioaddr + UART_IER);
2108         }
2109         spin_unlock_irqrestore(&info->slock, flags);
2110 }
2111
2112 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2113 {
2114         struct mxser_port *info = tty->driver_data;
2115         unsigned long flags;
2116
2117         spin_lock_irqsave(&info->slock, flags);
2118         mxser_change_speed(info, old_termios);
2119         spin_unlock_irqrestore(&info->slock, flags);
2120
2121         if ((old_termios->c_cflag & CRTSCTS) &&
2122                         !(tty->termios->c_cflag & CRTSCTS)) {
2123                 tty->hw_stopped = 0;
2124                 mxser_start(tty);
2125         }
2126
2127         /* Handle sw stopped */
2128         if ((old_termios->c_iflag & IXON) &&
2129                         !(tty->termios->c_iflag & IXON)) {
2130                 tty->stopped = 0;
2131
2132                 if (info->board->chip_flag) {
2133                         spin_lock_irqsave(&info->slock, flags);
2134                         mxser_disable_must_rx_software_flow_control(
2135                                         info->ioaddr);
2136                         spin_unlock_irqrestore(&info->slock, flags);
2137                 }
2138
2139                 mxser_start(tty);
2140         }
2141 }
2142
2143 /*
2144  * mxser_wait_until_sent() --- wait until the transmitter is empty
2145  */
2146 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2147 {
2148         struct mxser_port *info = tty->driver_data;
2149         unsigned long orig_jiffies, char_time;
2150         int lsr;
2151
2152         if (info->type == PORT_UNKNOWN)
2153                 return;
2154
2155         if (info->xmit_fifo_size == 0)
2156                 return;         /* Just in case.... */
2157
2158         orig_jiffies = jiffies;
2159         /*
2160          * Set the check interval to be 1/5 of the estimated time to
2161          * send a single character, and make it at least 1.  The check
2162          * interval should also be less than the timeout.
2163          *
2164          * Note: we have to use pretty tight timings here to satisfy
2165          * the NIST-PCTS.
2166          */
2167         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2168         char_time = char_time / 5;
2169         if (char_time == 0)
2170                 char_time = 1;
2171         if (timeout && timeout < char_time)
2172                 char_time = timeout;
2173         /*
2174          * If the transmitter hasn't cleared in twice the approximate
2175          * amount of time to send the entire FIFO, it probably won't
2176          * ever clear.  This assumes the UART isn't doing flow
2177          * control, which is currently the case.  Hence, if it ever
2178          * takes longer than info->timeout, this is probably due to a
2179          * UART bug of some kind.  So, we clamp the timeout parameter at
2180          * 2*info->timeout.
2181          */
2182         if (!timeout || timeout > 2 * info->timeout)
2183                 timeout = 2 * info->timeout;
2184 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2185         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2186                 timeout, char_time);
2187         printk("jiff=%lu...", jiffies);
2188 #endif
2189         lock_kernel();
2190         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2191 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2192                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2193 #endif
2194                 schedule_timeout_interruptible(char_time);
2195                 if (signal_pending(current))
2196                         break;
2197                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2198                         break;
2199         }
2200         set_current_state(TASK_RUNNING);
2201         unlock_kernel();
2202
2203 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2204         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2205 #endif
2206 }
2207
2208 /*
2209  * This routine is called by tty_hangup() when a hangup is signaled.
2210  */
2211 static void mxser_hangup(struct tty_struct *tty)
2212 {
2213         struct mxser_port *info = tty->driver_data;
2214
2215         mxser_flush_buffer(tty);
2216         mxser_shutdown(info);
2217         info->event = 0;
2218         info->port.count = 0;
2219         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2220         info->port.tty = NULL;
2221         wake_up_interruptible(&info->port.open_wait);
2222 }
2223
2224 /*
2225  * mxser_rs_break() --- routine which turns the break handling on or off
2226  */
2227 static void mxser_rs_break(struct tty_struct *tty, int break_state)
2228 {
2229         struct mxser_port *info = tty->driver_data;
2230         unsigned long flags;
2231
2232         spin_lock_irqsave(&info->slock, flags);
2233         if (break_state == -1)
2234                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2235                         info->ioaddr + UART_LCR);
2236         else
2237                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2238                         info->ioaddr + UART_LCR);
2239         spin_unlock_irqrestore(&info->slock, flags);
2240 }
2241
2242 static void mxser_receive_chars(struct mxser_port *port, int *status)
2243 {
2244         struct tty_struct *tty = port->port.tty;
2245         unsigned char ch, gdl;
2246         int ignored = 0;
2247         int cnt = 0;
2248         int recv_room;
2249         int max = 256;
2250
2251         recv_room = tty->receive_room;
2252         if ((recv_room == 0) && (!port->ldisc_stop_rx))
2253                 mxser_stoprx(tty);
2254
2255         if (port->board->chip_flag != MOXA_OTHER_UART) {
2256
2257                 if (*status & UART_LSR_SPECIAL)
2258                         goto intr_old;
2259                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2260                                 (*status & MOXA_MUST_LSR_RERR))
2261                         goto intr_old;
2262                 if (*status & MOXA_MUST_LSR_RERR)
2263                         goto intr_old;
2264
2265                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2266
2267                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2268                         gdl &= MOXA_MUST_GDL_MASK;
2269                 if (gdl >= recv_room) {
2270                         if (!port->ldisc_stop_rx)
2271                                 mxser_stoprx(tty);
2272                 }
2273                 while (gdl--) {
2274                         ch = inb(port->ioaddr + UART_RX);
2275                         tty_insert_flip_char(tty, ch, 0);
2276                         cnt++;
2277                 }
2278                 goto end_intr;
2279         }
2280 intr_old:
2281
2282         do {
2283                 if (max-- < 0)
2284                         break;
2285
2286                 ch = inb(port->ioaddr + UART_RX);
2287                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2288                         outb(0x23, port->ioaddr + UART_FCR);
2289                 *status &= port->read_status_mask;
2290                 if (*status & port->ignore_status_mask) {
2291                         if (++ignored > 100)
2292                                 break;
2293                 } else {
2294                         char flag = 0;
2295                         if (*status & UART_LSR_SPECIAL) {
2296                                 if (*status & UART_LSR_BI) {
2297                                         flag = TTY_BREAK;
2298                                         port->icount.brk++;
2299
2300                                         if (port->port.flags & ASYNC_SAK)
2301                                                 do_SAK(tty);
2302                                 } else if (*status & UART_LSR_PE) {
2303                                         flag = TTY_PARITY;
2304                                         port->icount.parity++;
2305                                 } else if (*status & UART_LSR_FE) {
2306                                         flag = TTY_FRAME;
2307                                         port->icount.frame++;
2308                                 } else if (*status & UART_LSR_OE) {
2309                                         flag = TTY_OVERRUN;
2310                                         port->icount.overrun++;
2311                                 } else
2312                                         flag = TTY_BREAK;
2313                         }
2314                         tty_insert_flip_char(tty, ch, flag);
2315                         cnt++;
2316                         if (cnt >= recv_room) {
2317                                 if (!port->ldisc_stop_rx)
2318                                         mxser_stoprx(tty);
2319                                 break;
2320                         }
2321
2322                 }
2323
2324                 if (port->board->chip_flag)
2325                         break;
2326
2327                 *status = inb(port->ioaddr + UART_LSR);
2328         } while (*status & UART_LSR_DR);
2329
2330 end_intr:
2331         mxvar_log.rxcnt[port->port.tty->index] += cnt;
2332         port->mon_data.rxcnt += cnt;
2333         port->mon_data.up_rxcnt += cnt;
2334
2335         /*
2336          * We are called from an interrupt context with &port->slock
2337          * being held. Drop it temporarily in order to prevent
2338          * recursive locking.
2339          */
2340         spin_unlock(&port->slock);
2341         tty_flip_buffer_push(tty);
2342         spin_lock(&port->slock);
2343 }
2344
2345 static void mxser_transmit_chars(struct mxser_port *port)
2346 {
2347         int count, cnt;
2348
2349         if (port->x_char) {
2350                 outb(port->x_char, port->ioaddr + UART_TX);
2351                 port->x_char = 0;
2352                 mxvar_log.txcnt[port->port.tty->index]++;
2353                 port->mon_data.txcnt++;
2354                 port->mon_data.up_txcnt++;
2355                 port->icount.tx++;
2356                 return;
2357         }
2358
2359         if (port->port.xmit_buf == NULL)
2360                 return;
2361
2362         if ((port->xmit_cnt <= 0) || port->port.tty->stopped ||
2363                         (port->port.tty->hw_stopped &&
2364                         (port->type != PORT_16550A) &&
2365                         (!port->board->chip_flag))) {
2366                 port->IER &= ~UART_IER_THRI;
2367                 outb(port->IER, port->ioaddr + UART_IER);
2368                 return;
2369         }
2370
2371         cnt = port->xmit_cnt;
2372         count = port->xmit_fifo_size;
2373         do {
2374                 outb(port->port.xmit_buf[port->xmit_tail++],
2375                         port->ioaddr + UART_TX);
2376                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2377                 if (--port->xmit_cnt <= 0)
2378                         break;
2379         } while (--count > 0);
2380         mxvar_log.txcnt[port->port.tty->index] += (cnt - port->xmit_cnt);
2381
2382         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2383         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2384         port->icount.tx += (cnt - port->xmit_cnt);
2385
2386         if (port->xmit_cnt < WAKEUP_CHARS)
2387                 tty_wakeup(port->port.tty);
2388
2389         if (port->xmit_cnt <= 0) {
2390                 port->IER &= ~UART_IER_THRI;
2391                 outb(port->IER, port->ioaddr + UART_IER);
2392         }
2393 }
2394
2395 /*
2396  * This is the serial driver's generic interrupt routine
2397  */
2398 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2399 {
2400         int status, iir, i;
2401         struct mxser_board *brd = NULL;
2402         struct mxser_port *port;
2403         int max, irqbits, bits, msr;
2404         unsigned int int_cnt, pass_counter = 0;
2405         int handled = IRQ_NONE;
2406
2407         for (i = 0; i < MXSER_BOARDS; i++)
2408                 if (dev_id == &mxser_boards[i]) {
2409                         brd = dev_id;
2410                         break;
2411                 }
2412
2413         if (i == MXSER_BOARDS)
2414                 goto irq_stop;
2415         if (brd == NULL)
2416                 goto irq_stop;
2417         max = brd->info->nports;
2418         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2419                 irqbits = inb(brd->vector) & brd->vector_mask;
2420                 if (irqbits == brd->vector_mask)
2421                         break;
2422
2423                 handled = IRQ_HANDLED;
2424                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2425                         if (irqbits == brd->vector_mask)
2426                                 break;
2427                         if (bits & irqbits)
2428                                 continue;
2429                         port = &brd->ports[i];
2430
2431                         int_cnt = 0;
2432                         spin_lock(&port->slock);
2433                         do {
2434                                 iir = inb(port->ioaddr + UART_IIR);
2435                                 if (iir & UART_IIR_NO_INT)
2436                                         break;
2437                                 iir &= MOXA_MUST_IIR_MASK;
2438                                 if (!port->port.tty ||
2439                                                 (port->port.flags & ASYNC_CLOSING) ||
2440                                                 !(port->port.flags &
2441                                                         ASYNC_INITIALIZED)) {
2442                                         status = inb(port->ioaddr + UART_LSR);
2443                                         outb(0x27, port->ioaddr + UART_FCR);
2444                                         inb(port->ioaddr + UART_MSR);
2445                                         break;
2446                                 }
2447
2448                                 status = inb(port->ioaddr + UART_LSR);
2449
2450                                 if (status & UART_LSR_PE)
2451                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2452                                 if (status & UART_LSR_FE)
2453                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2454                                 if (status & UART_LSR_OE)
2455                                         port->err_shadow |=
2456                                                 NPPI_NOTIFY_HW_OVERRUN;
2457                                 if (status & UART_LSR_BI)
2458                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2459
2460                                 if (port->board->chip_flag) {
2461                                         if (iir == MOXA_MUST_IIR_GDA ||
2462                                             iir == MOXA_MUST_IIR_RDA ||
2463                                             iir == MOXA_MUST_IIR_RTO ||
2464                                             iir == MOXA_MUST_IIR_LSR)
2465                                                 mxser_receive_chars(port,
2466                                                                 &status);
2467
2468                                 } else {
2469                                         status &= port->read_status_mask;
2470                                         if (status & UART_LSR_DR)
2471                                                 mxser_receive_chars(port,
2472                                                                 &status);
2473                                 }
2474                                 msr = inb(port->ioaddr + UART_MSR);
2475                                 if (msr & UART_MSR_ANY_DELTA)
2476                                         mxser_check_modem_status(port, msr);
2477
2478                                 if (port->board->chip_flag) {
2479                                         if (iir == 0x02 && (status &
2480                                                                 UART_LSR_THRE))
2481                                                 mxser_transmit_chars(port);
2482                                 } else {
2483                                         if (status & UART_LSR_THRE)
2484                                                 mxser_transmit_chars(port);
2485                                 }
2486                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2487                         spin_unlock(&port->slock);
2488                 }
2489         }
2490
2491 irq_stop:
2492         return handled;
2493 }
2494
2495 static const struct tty_operations mxser_ops = {
2496         .open = mxser_open,
2497         .close = mxser_close,
2498         .write = mxser_write,
2499         .put_char = mxser_put_char,
2500         .flush_chars = mxser_flush_chars,
2501         .write_room = mxser_write_room,
2502         .chars_in_buffer = mxser_chars_in_buffer,
2503         .flush_buffer = mxser_flush_buffer,
2504         .ioctl = mxser_ioctl,
2505         .throttle = mxser_throttle,
2506         .unthrottle = mxser_unthrottle,
2507         .set_termios = mxser_set_termios,
2508         .stop = mxser_stop,
2509         .start = mxser_start,
2510         .hangup = mxser_hangup,
2511         .break_ctl = mxser_rs_break,
2512         .wait_until_sent = mxser_wait_until_sent,
2513         .tiocmget = mxser_tiocmget,
2514         .tiocmset = mxser_tiocmset,
2515 };
2516
2517 /*
2518  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2519  */
2520
2521 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2522                 unsigned int irq)
2523 {
2524         if (irq)
2525                 free_irq(brd->irq, brd);
2526         if (pdev != NULL) {     /* PCI */
2527 #ifdef CONFIG_PCI
2528                 pci_release_region(pdev, 2);
2529                 pci_release_region(pdev, 3);
2530 #endif
2531         } else {
2532                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2533                 release_region(brd->vector, 1);
2534         }
2535 }
2536
2537 static int __devinit mxser_initbrd(struct mxser_board *brd,
2538                 struct pci_dev *pdev)
2539 {
2540         struct mxser_port *info;
2541         unsigned int i;
2542         int retval;
2543
2544         printk(KERN_INFO "max. baud rate = %d bps.\n", brd->ports[0].max_baud);
2545
2546         for (i = 0; i < brd->info->nports; i++) {
2547                 info = &brd->ports[i];
2548                 info->board = brd;
2549                 info->stop_rx = 0;
2550                 info->ldisc_stop_rx = 0;
2551
2552                 /* Enhance mode enabled here */
2553                 if (brd->chip_flag != MOXA_OTHER_UART)
2554                         mxser_enable_must_enchance_mode(info->ioaddr);
2555
2556                 info->port.flags = ASYNC_SHARE_IRQ;
2557                 info->type = brd->uart_type;
2558
2559                 process_txrx_fifo(info);
2560
2561                 info->custom_divisor = info->baud_base * 16;
2562                 info->close_delay = 5 * HZ / 10;
2563                 info->closing_wait = 30 * HZ;
2564                 info->normal_termios = mxvar_sdriver->init_termios;
2565                 tty_port_init(&info->port);
2566                 init_waitqueue_head(&info->delta_msr_wait);
2567                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2568                 info->err_shadow = 0;
2569                 spin_lock_init(&info->slock);
2570
2571                 /* before set INT ISR, disable all int */
2572                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2573                         info->ioaddr + UART_IER);
2574         }
2575
2576         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2577                         brd);
2578         if (retval) {
2579                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2580                         "conflict with another device.\n",
2581                         brd->info->name, brd->irq);
2582                 /* We hold resources, we need to release them. */
2583                 mxser_release_res(brd, pdev, 0);
2584         }
2585         return retval;
2586 }
2587
2588 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2589 {
2590         int id, i, bits;
2591         unsigned short regs[16], irq;
2592         unsigned char scratch, scratch2;
2593
2594         brd->chip_flag = MOXA_OTHER_UART;
2595
2596         id = mxser_read_register(cap, regs);
2597         switch (id) {
2598         case C168_ASIC_ID:
2599                 brd->info = &mxser_cards[0];
2600                 break;
2601         case C104_ASIC_ID:
2602                 brd->info = &mxser_cards[1];
2603                 break;
2604         case CI104J_ASIC_ID:
2605                 brd->info = &mxser_cards[2];
2606                 break;
2607         case C102_ASIC_ID:
2608                 brd->info = &mxser_cards[5];
2609                 break;
2610         case CI132_ASIC_ID:
2611                 brd->info = &mxser_cards[6];
2612                 break;
2613         case CI134_ASIC_ID:
2614                 brd->info = &mxser_cards[7];
2615                 break;
2616         default:
2617                 return 0;
2618         }
2619
2620         irq = 0;
2621         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2622            Flag-hack checks if configuration should be read as 2-port here. */
2623         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2624                 irq = regs[9] & 0xF000;
2625                 irq = irq | (irq >> 4);
2626                 if (irq != (regs[9] & 0xFF00))
2627                         return MXSER_ERR_IRQ_CONFLIT;
2628         } else if (brd->info->nports == 4) {
2629                 irq = regs[9] & 0xF000;
2630                 irq = irq | (irq >> 4);
2631                 irq = irq | (irq >> 8);
2632                 if (irq != regs[9])
2633                         return MXSER_ERR_IRQ_CONFLIT;
2634         } else if (brd->info->nports == 8) {
2635                 irq = regs[9] & 0xF000;
2636                 irq = irq | (irq >> 4);
2637                 irq = irq | (irq >> 8);
2638                 if ((irq != regs[9]) || (irq != regs[10]))
2639                         return MXSER_ERR_IRQ_CONFLIT;
2640         }
2641
2642         if (!irq)
2643                 return MXSER_ERR_IRQ;
2644         brd->irq = ((int)(irq & 0xF000) >> 12);
2645         for (i = 0; i < 8; i++)
2646                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2647         if ((regs[12] & 0x80) == 0)
2648                 return MXSER_ERR_VECTOR;
2649         brd->vector = (int)regs[11];    /* interrupt vector */
2650         if (id == 1)
2651                 brd->vector_mask = 0x00FF;
2652         else
2653                 brd->vector_mask = 0x000F;
2654         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2655                 if (regs[12] & bits) {
2656                         brd->ports[i].baud_base = 921600;
2657                         brd->ports[i].max_baud = 921600;
2658                 } else {
2659                         brd->ports[i].baud_base = 115200;
2660                         brd->ports[i].max_baud = 115200;
2661                 }
2662         }
2663         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2664         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2665         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2666         outb(scratch2, cap + UART_LCR);
2667         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2668         scratch = inb(cap + UART_IIR);
2669
2670         if (scratch & 0xC0)
2671                 brd->uart_type = PORT_16550A;
2672         else
2673                 brd->uart_type = PORT_16450;
2674         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2675                         "mxser(IO)"))
2676                 return MXSER_ERR_IOADDR;
2677         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2678                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2679                 return MXSER_ERR_VECTOR;
2680         }
2681         return brd->info->nports;
2682 }
2683
2684 static int __devinit mxser_probe(struct pci_dev *pdev,
2685                 const struct pci_device_id *ent)
2686 {
2687 #ifdef CONFIG_PCI
2688         struct mxser_board *brd;
2689         unsigned int i, j;
2690         unsigned long ioaddress;
2691         int retval = -EINVAL;
2692
2693         for (i = 0; i < MXSER_BOARDS; i++)
2694                 if (mxser_boards[i].info == NULL)
2695                         break;
2696
2697         if (i >= MXSER_BOARDS) {
2698                 printk(KERN_ERR "Too many Smartio/Industio family boards found "
2699                         "(maximum %d), board not configured\n", MXSER_BOARDS);
2700                 goto err;
2701         }
2702
2703         brd = &mxser_boards[i];
2704         brd->idx = i * MXSER_PORTS_PER_BOARD;
2705         printk(KERN_INFO "Found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2706                 mxser_cards[ent->driver_data].name,
2707                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2708
2709         retval = pci_enable_device(pdev);
2710         if (retval) {
2711                 printk(KERN_ERR "Moxa SmartI/O PCI enable fail !\n");
2712                 goto err;
2713         }
2714
2715         /* io address */
2716         ioaddress = pci_resource_start(pdev, 2);
2717         retval = pci_request_region(pdev, 2, "mxser(IO)");
2718         if (retval)
2719                 goto err;
2720
2721         brd->info = &mxser_cards[ent->driver_data];
2722         for (i = 0; i < brd->info->nports; i++)
2723                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2724
2725         /* vector */
2726         ioaddress = pci_resource_start(pdev, 3);
2727         retval = pci_request_region(pdev, 3, "mxser(vector)");
2728         if (retval)
2729                 goto err_relio;
2730         brd->vector = ioaddress;
2731
2732         /* irq */
2733         brd->irq = pdev->irq;
2734
2735         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2736         brd->uart_type = PORT_16550A;
2737         brd->vector_mask = 0;
2738
2739         for (i = 0; i < brd->info->nports; i++) {
2740                 for (j = 0; j < UART_INFO_NUM; j++) {
2741                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2742                                 brd->ports[i].max_baud =
2743                                         Gpci_uart_info[j].max_baud;
2744
2745                                 /* exception....CP-102 */
2746                                 if (brd->info->flags & MXSER_HIGHBAUD)
2747                                         brd->ports[i].max_baud = 921600;
2748                                 break;
2749                         }
2750                 }
2751         }
2752
2753         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2754                 for (i = 0; i < brd->info->nports; i++) {
2755                         if (i < 4)
2756                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2757                         else
2758                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2759                 }
2760                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2761                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2762         }
2763
2764         for (i = 0; i < brd->info->nports; i++) {
2765                 brd->vector_mask |= (1 << i);
2766                 brd->ports[i].baud_base = 921600;
2767         }
2768
2769         /* mxser_initbrd will hook ISR. */
2770         retval = mxser_initbrd(brd, pdev);
2771         if (retval)
2772                 goto err_null;
2773
2774         for (i = 0; i < brd->info->nports; i++)
2775                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2776
2777         pci_set_drvdata(pdev, brd);
2778
2779         return 0;
2780 err_relio:
2781         pci_release_region(pdev, 2);
2782 err_null:
2783         brd->info = NULL;
2784 err:
2785         return retval;
2786 #else
2787         return -ENODEV;
2788 #endif
2789 }
2790
2791 static void __devexit mxser_remove(struct pci_dev *pdev)
2792 {
2793         struct mxser_board *brd = pci_get_drvdata(pdev);
2794         unsigned int i;
2795
2796         for (i = 0; i < brd->info->nports; i++)
2797                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2798
2799         mxser_release_res(brd, pdev, 1);
2800         brd->info = NULL;
2801 }
2802
2803 static struct pci_driver mxser_driver = {
2804         .name = "mxser",
2805         .id_table = mxser_pcibrds,
2806         .probe = mxser_probe,
2807         .remove = __devexit_p(mxser_remove)
2808 };
2809
2810 static int __init mxser_module_init(void)
2811 {
2812         struct mxser_board *brd;
2813         unsigned long cap;
2814         unsigned int i, m, isaloop;
2815         int retval, b;
2816
2817         pr_debug("Loading module mxser ...\n");
2818
2819         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2820         if (!mxvar_sdriver)
2821                 return -ENOMEM;
2822
2823         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2824                 MXSER_VERSION);
2825
2826         /* Initialize the tty_driver structure */
2827         mxvar_sdriver->owner = THIS_MODULE;
2828         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2829         mxvar_sdriver->name = "ttyMI";
2830         mxvar_sdriver->major = ttymajor;
2831         mxvar_sdriver->minor_start = 0;
2832         mxvar_sdriver->num = MXSER_PORTS + 1;
2833         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2834         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2835         mxvar_sdriver->init_termios = tty_std_termios;
2836         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2837         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2838         tty_set_operations(mxvar_sdriver, &mxser_ops);
2839
2840         retval = tty_register_driver(mxvar_sdriver);
2841         if (retval) {
2842                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2843                                 "tty driver !\n");
2844                 goto err_put;
2845         }
2846
2847         mxvar_diagflag = 0;
2848
2849         m = 0;
2850         /* Start finding ISA boards here */
2851         for (isaloop = 0; isaloop < 2; isaloop++)
2852                 for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
2853                         if (!isaloop)
2854                                 cap = mxserBoardCAP[b]; /* predefined */
2855                         else
2856                                 cap = ioaddr[b]; /* module param */
2857
2858                         if (!cap)
2859                                 continue;
2860
2861                         brd = &mxser_boards[m];
2862                         retval = mxser_get_ISA_conf(cap, brd);
2863
2864                         if (retval != 0)
2865                                 printk(KERN_INFO "Found MOXA %s board "
2866                                         "(CAP=0x%x)\n",
2867                                         brd->info->name, ioaddr[b]);
2868
2869                         if (retval <= 0) {
2870                                 if (retval == MXSER_ERR_IRQ)
2871                                         printk(KERN_ERR "Invalid interrupt "
2872                                                 "number, board not "
2873                                                 "configured\n");
2874                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
2875                                         printk(KERN_ERR "Invalid interrupt "
2876                                                 "number, board not "
2877                                                 "configured\n");
2878                                 else if (retval == MXSER_ERR_VECTOR)
2879                                         printk(KERN_ERR "Invalid interrupt "
2880                                                 "vector, board not "
2881                                                 "configured\n");
2882                                 else if (retval == MXSER_ERR_IOADDR)
2883                                         printk(KERN_ERR "Invalid I/O address, "
2884                                                 "board not configured\n");
2885
2886                                 brd->info = NULL;
2887                                 continue;
2888                         }
2889
2890                         /* mxser_initbrd will hook ISR. */
2891                         if (mxser_initbrd(brd, NULL) < 0) {
2892                                 brd->info = NULL;
2893                                 continue;
2894                         }
2895
2896                         brd->idx = m * MXSER_PORTS_PER_BOARD;
2897                         for (i = 0; i < brd->info->nports; i++)
2898                                 tty_register_device(mxvar_sdriver, brd->idx + i,
2899                                                 NULL);
2900
2901                         m++;
2902                 }
2903
2904         retval = pci_register_driver(&mxser_driver);
2905         if (retval) {
2906                 printk(KERN_ERR "Can't register pci driver\n");
2907                 if (!m) {
2908                         retval = -ENODEV;
2909                         goto err_unr;
2910                 } /* else: we have some ISA cards under control */
2911         }
2912
2913         pr_debug("Done.\n");
2914
2915         return 0;
2916 err_unr:
2917         tty_unregister_driver(mxvar_sdriver);
2918 err_put:
2919         put_tty_driver(mxvar_sdriver);
2920         return retval;
2921 }
2922
2923 static void __exit mxser_module_exit(void)
2924 {
2925         unsigned int i, j;
2926
2927         pr_debug("Unloading module mxser ...\n");
2928
2929         pci_unregister_driver(&mxser_driver);
2930
2931         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2932                 if (mxser_boards[i].info != NULL)
2933                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2934                                 tty_unregister_device(mxvar_sdriver,
2935                                                 mxser_boards[i].idx + j);
2936         tty_unregister_driver(mxvar_sdriver);
2937         put_tty_driver(mxvar_sdriver);
2938
2939         for (i = 0; i < MXSER_BOARDS; i++)
2940                 if (mxser_boards[i].info != NULL)
2941                         mxser_release_res(&mxser_boards[i], NULL, 1);
2942
2943         pr_debug("Done.\n");
2944 }
2945
2946 module_init(mxser_module_init);
2947 module_exit(mxser_module_exit);