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@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
  18  *      www.moxa.com.
  19  *      - Fixed x86_64 cleanness
  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   "2.0.4"         /* 1.12 */
  51 #define MXSERMAJOR       174
  52
  53 #define MXSER_BOARDS            4       /* Max. boards */
  54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  56 #define MXSER_ISR_PASS_LIMIT    100
  57
  58 /*CheckIsMoxaMust return value*/
  59 #define MOXA_OTHER_UART         0x00
  60 #define MOXA_MUST_MU150_HWID    0x01
  61 #define MOXA_MUST_MU860_HWID    0x02
  62
  63 #define WAKEUP_CHARS            256
  64
  65 #define UART_MCR_AFE            0x20
  66 #define UART_LSR_SPECIAL        0x1E
  67
  68 #define PCI_DEVICE_ID_POS104UL  0x1044
  69 #define PCI_DEVICE_ID_CB108     0x1080
  70 #define PCI_DEVICE_ID_CP102UF   0x1023
  71 #define PCI_DEVICE_ID_CB114     0x1142
  72 #define PCI_DEVICE_ID_CP114UL   0x1143
  73 #define PCI_DEVICE_ID_CB134I    0x1341
  74 #define PCI_DEVICE_ID_CP138U    0x1380
  75
  76
  77 #define C168_ASIC_ID    1
  78 #define C104_ASIC_ID    2
  79 #define C102_ASIC_ID    0xB
  80 #define CI132_ASIC_ID   4
  81 #define CI134_ASIC_ID   3
  82 #define CI104J_ASIC_ID  5
  83
  84 #define MXSER_HIGHBAUD  1
  85 #define MXSER_HAS2      2
  86
  87 /* This is only for PCI */
  88 static const struct {
  89         int type;
  90         int tx_fifo;
  91         int rx_fifo;
  92         int xmit_fifo_size;
  93         int rx_high_water;
  94         int rx_trigger;
  95         int rx_low_water;
  96         long max_baud;
  97 } Gpci_uart_info[] = {
  98         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
  99         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 100         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 101 };
 102 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 103
 104 struct mxser_cardinfo {
 105         char *name;
 106         unsigned int nports;
 107         unsigned int flags;
 108 };
 109
 110 static const struct mxser_cardinfo mxser_cards[] = {
 111 /* 0*/  { "C168 series",        8, },
 112         { "C104 series",        4, },
 113         { "CI-104J series",     4, },
 114         { "C168H/PCI series",   8, },
 115         { "C104H/PCI series",   4, },
 116 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 117         { "CI-132 series",      4, MXSER_HAS2 },
 118         { "CI-134 series",      4, },
 119         { "CP-132 series",      2, },
 120         { "CP-114 series",      4, },
 121 /*10*/  { "CT-114 series",      4, },
 122         { "CP-102 series",      2, MXSER_HIGHBAUD },
 123         { "CP-104U series",     4, },
 124         { "CP-168U series",     8, },
 125         { "CP-132U series",     2, },
 126 /*15*/  { "CP-134U series",     4, },
 127         { "CP-104JU series",    4, },
 128         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 129         { "CP-118U series",     8, },
 130         { "CP-102UL series",    2, },
 131 /*20*/  { "CP-102U series",     2, },
 132         { "CP-118EL series",    8, },
 133         { "CP-168EL series",    8, },
 134         { "CP-104EL series",    4, },
 135         { "CB-108 series",      8, },
 136 /*25*/  { "CB-114 series",      4, },
 137         { "CB-134I series",     4, },
 138         { "CP-138U series",     8, },
 139         { "POS-104UL series",   4, },
 140         { "CP-114UL series",    4, },
 141 /*30*/  { "CP-102UF series",    2, }
 142 };
 143
 144 /* driver_data correspond to the lines in the structure above
 145    see also ISA probe function before you change something */
 146 static struct pci_device_id mxser_pcibrds[] = {
 147         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 148         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 172         { }
 173 };
 174 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 175
 176 static unsigned long ioaddr[MXSER_BOARDS];
 177 static int ttymajor = MXSERMAJOR;
 178
 179 /* Variables for insmod */
 180
 181 MODULE_AUTHOR("Casper Yang");
 182 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 183 module_param_array(ioaddr, ulong, NULL, 0);
 184 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 185 module_param(ttymajor, int, 0);
 186 MODULE_LICENSE("GPL");
 187
 188 struct mxser_log {
 189         int tick;
 190         unsigned long rxcnt[MXSER_PORTS];
 191         unsigned long txcnt[MXSER_PORTS];
 192 };
 193
 194 struct mxser_mon {
 195         unsigned long rxcnt;
 196         unsigned long txcnt;
 197         unsigned long up_rxcnt;
 198         unsigned long up_txcnt;
 199         int modem_status;
 200         unsigned char hold_reason;
 201 };
 202
 203 struct mxser_mon_ext {
 204         unsigned long rx_cnt[32];
 205         unsigned long tx_cnt[32];
 206         unsigned long up_rxcnt[32];
 207         unsigned long up_txcnt[32];
 208         int modem_status[32];
 209
 210         long baudrate[32];
 211         int databits[32];
 212         int stopbits[32];
 213         int parity[32];
 214         int flowctrl[32];
 215         int fifo[32];
 216         int iftype[32];
 217 };
 218
 219 struct mxser_board;
 220
 221 struct mxser_port {
 222         struct tty_port port;
 223         struct mxser_board *board;
 224
 225         unsigned long ioaddr;
 226         unsigned long opmode_ioaddr;
 227         int max_baud;
 228
 229         int rx_high_water;
 230         int rx_trigger;         /* Rx fifo trigger level */
 231         int rx_low_water;
 232         int baud_base;          /* max. speed */
 233         int type;               /* UART type */
 234
 235         int x_char;             /* xon/xoff character */
 236         int IER;                /* Interrupt Enable Register */
 237         int MCR;                /* Modem control register */
 238
 239         unsigned char stop_rx;
 240         unsigned char ldisc_stop_rx;
 241
 242         int custom_divisor;
 243         unsigned char err_shadow;
 244
 245         struct async_icount icount; /* kernel counters for 4 input interrupts */
 246         int timeout;
 247
 248         int read_status_mask;
 249         int ignore_status_mask;
 250         int xmit_fifo_size;
 251         int xmit_head;
 252         int xmit_tail;
 253         int xmit_cnt;
 254
 255         struct ktermios normal_termios;
 256
 257         struct mxser_mon mon_data;
 258
 259         spinlock_t slock;
 260         wait_queue_head_t delta_msr_wait;
 261 };
 262
 263 struct mxser_board {
 264         unsigned int idx;
 265         int irq;
 266         const struct mxser_cardinfo *info;
 267         unsigned long vector;
 268         unsigned long vector_mask;
 269
 270         int chip_flag;
 271         int uart_type;
 272
 273         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 274 };
 275
 276 struct mxser_mstatus {
 277         tcflag_t cflag;
 278         int cts;
 279         int dsr;
 280         int ri;
 281         int dcd;
 282 };
 283
 284 static struct mxser_board mxser_boards[MXSER_BOARDS];
 285 static struct tty_driver *mxvar_sdriver;
 286 static struct mxser_log mxvar_log;
 287 static int mxser_set_baud_method[MXSER_PORTS + 1];
 288
 289 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 290 {
 291         u8 oldlcr;
 292         u8 efr;
 293
 294         oldlcr = inb(baseio + UART_LCR);
 295         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 296
 297         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 298         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 299
 300         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 301         outb(oldlcr, baseio + UART_LCR);
 302 }
 303
 304 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 305 {
 306         u8 oldlcr;
 307         u8 efr;
 308
 309         oldlcr = inb(baseio + UART_LCR);
 310         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 311
 312         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 313         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 314
 315         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 316         outb(oldlcr, baseio + UART_LCR);
 317 }
 318
 319 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 320 {
 321         u8 oldlcr;
 322         u8 efr;
 323
 324         oldlcr = inb(baseio + UART_LCR);
 325         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 326
 327         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 328         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 329         efr |= MOXA_MUST_EFR_BANK0;
 330
 331         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 332         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 333         outb(oldlcr, baseio + UART_LCR);
 334 }
 335
 336 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 337 {
 338         u8 oldlcr;
 339         u8 efr;
 340
 341         oldlcr = inb(baseio + UART_LCR);
 342         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 343
 344         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 345         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 346         efr |= MOXA_MUST_EFR_BANK0;
 347
 348         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 349         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 350         outb(oldlcr, baseio + UART_LCR);
 351 }
 352
 353 static void mxser_set_must_fifo_value(struct mxser_port *info)
 354 {
 355         u8 oldlcr;
 356         u8 efr;
 357
 358         oldlcr = inb(info->ioaddr + UART_LCR);
 359         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 360
 361         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 362         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 363         efr |= MOXA_MUST_EFR_BANK1;
 364
 365         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 366         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 367         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 368         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 369         outb(oldlcr, info->ioaddr + UART_LCR);
 370 }
 371
 372 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 373 {
 374         u8 oldlcr;
 375         u8 efr;
 376
 377         oldlcr = inb(baseio + UART_LCR);
 378         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 379
 380         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 381         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 382         efr |= MOXA_MUST_EFR_BANK2;
 383
 384         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 385         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 386         outb(oldlcr, baseio + UART_LCR);
 387 }
 388
 389 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 390 {
 391         u8 oldlcr;
 392         u8 efr;
 393
 394         oldlcr = inb(baseio + UART_LCR);
 395         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 396
 397         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 398         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 399         efr |= MOXA_MUST_EFR_BANK2;
 400
 401         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 402         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 403         outb(oldlcr, baseio + UART_LCR);
 404 }
 405
 406 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 407 {
 408         u8 oldlcr;
 409         u8 efr;
 410
 411         oldlcr = inb(baseio + UART_LCR);
 412         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 413
 414         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 415         efr &= ~MOXA_MUST_EFR_SF_MASK;
 416
 417         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 418         outb(oldlcr, baseio + UART_LCR);
 419 }
 420
 421 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 422 {
 423         u8 oldlcr;
 424         u8 efr;
 425
 426         oldlcr = inb(baseio + UART_LCR);
 427         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 428
 429         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 430         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 431         efr |= MOXA_MUST_EFR_SF_TX1;
 432
 433         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 434         outb(oldlcr, baseio + UART_LCR);
 435 }
 436
 437 static void mxser_disable_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
 448         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 449         outb(oldlcr, baseio + UART_LCR);
 450 }
 451
 452 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 453 {
 454         u8 oldlcr;
 455         u8 efr;
 456
 457         oldlcr = inb(baseio + UART_LCR);
 458         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 459
 460         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 461         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 462         efr |= MOXA_MUST_EFR_SF_RX1;
 463
 464         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 465         outb(oldlcr, baseio + UART_LCR);
 466 }
 467
 468 static void mxser_disable_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
 479         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 480         outb(oldlcr, baseio + UART_LCR);
 481 }
 482
 483 #ifdef CONFIG_PCI
 484 static int __devinit CheckIsMoxaMust(unsigned long io)
 485 {
 486         u8 oldmcr, hwid;
 487         int i;
 488
 489         outb(0, io + UART_LCR);
 490         mxser_disable_must_enchance_mode(io);
 491         oldmcr = inb(io + UART_MCR);
 492         outb(0, io + UART_MCR);
 493         mxser_set_must_xon1_value(io, 0x11);
 494         if ((hwid = inb(io + UART_MCR)) != 0) {
 495                 outb(oldmcr, io + UART_MCR);
 496                 return MOXA_OTHER_UART;
 497         }
 498
 499         mxser_get_must_hardware_id(io, &hwid);
 500         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 501                 if (hwid == Gpci_uart_info[i].type)
 502                         return (int)hwid;
 503         }
 504         return MOXA_OTHER_UART;
 505 }
 506 #endif
 507
 508 static void process_txrx_fifo(struct mxser_port *info)
 509 {
 510         int i;
 511
 512         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 513                 info->rx_trigger = 1;
 514                 info->rx_high_water = 1;
 515                 info->rx_low_water = 1;
 516                 info->xmit_fifo_size = 1;
 517         } else
 518                 for (i = 0; i < UART_INFO_NUM; i++)
 519                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 520                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 521                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 522                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 523                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 524                                 break;
 525                         }
 526 }
 527
 528 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 529 {
 530         static unsigned char mxser_msr[MXSER_PORTS + 1];
 531         unsigned char status = 0;
 532
 533         status = inb(baseaddr + UART_MSR);
 534
 535         mxser_msr[port] &= 0x0F;
 536         mxser_msr[port] |= status;
 537         status = mxser_msr[port];
 538         if (mode)
 539                 mxser_msr[port] = 0;
 540
 541         return status;
 542 }
 543
 544 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 545                 struct mxser_port *port)
 546 {
 547         DECLARE_WAITQUEUE(wait, current);
 548         int retval;
 549         int do_clocal = 0;
 550         unsigned long flags;
 551
 552         /*
 553          * If non-blocking mode is set, or the port is not enabled,
 554          * then make the check up front and then exit.
 555          */
 556         if ((filp->f_flags & O_NONBLOCK) ||
 557                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 558                 port->port.flags |= ASYNC_NORMAL_ACTIVE;
 559                 return 0;
 560         }
 561
 562         if (tty->termios->c_cflag & CLOCAL)
 563                 do_clocal = 1;
 564
 565         /*
 566          * Block waiting for the carrier detect and the line to become
 567          * free (i.e., not in use by the callout).  While we are in
 568          * this loop, port->port.count is dropped by one, so that
 569          * mxser_close() knows when to free things.  We restore it upon
 570          * exit, either normal or abnormal.
 571          */
 572         retval = 0;
 573         add_wait_queue(&port->port.open_wait, &wait);
 574
 575         spin_lock_irqsave(&port->slock, flags);
 576         if (!tty_hung_up_p(filp))
 577                 port->port.count--;
 578         spin_unlock_irqrestore(&port->slock, flags);
 579         port->port.blocked_open++;
 580         while (1) {
 581                 spin_lock_irqsave(&port->slock, flags);
 582                 outb(inb(port->ioaddr + UART_MCR) |
 583                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 584                 spin_unlock_irqrestore(&port->slock, flags);
 585                 set_current_state(TASK_INTERRUPTIBLE);
 586                 if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
 587                         if (port->port.flags & ASYNC_HUP_NOTIFY)
 588                                 retval = -EAGAIN;
 589                         else
 590                                 retval = -ERESTARTSYS;
 591                         break;
 592                 }
 593                 if (!(port->port.flags & ASYNC_CLOSING) &&
 594                                 (do_clocal ||
 595                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 596                         break;
 597                 if (signal_pending(current)) {
 598                         retval = -ERESTARTSYS;
 599                         break;
 600                 }
 601                 schedule();
 602         }
 603         set_current_state(TASK_RUNNING);
 604         remove_wait_queue(&port->port.open_wait, &wait);
 605         if (!tty_hung_up_p(filp))
 606                 port->port.count++;
 607         port->port.blocked_open--;
 608         if (retval)
 609                 return retval;
 610         port->port.flags |= ASYNC_NORMAL_ACTIVE;
 611         return 0;
 612 }
 613
 614 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 615 {
 616         struct mxser_port *info = tty->driver_data;
 617         int quot = 0, baud;
 618         unsigned char cval;
 619
 620         if (!info->ioaddr)
 621                 return -1;
 622
 623         if (newspd > info->max_baud)
 624                 return -1;
 625
 626         if (newspd == 134) {
 627                 quot = 2 * info->baud_base / 269;
 628                 tty_encode_baud_rate(tty, 134, 134);
 629         } else if (newspd) {
 630                 quot = info->baud_base / newspd;
 631                 if (quot == 0)
 632                         quot = 1;
 633                 baud = info->baud_base/quot;
 634                 tty_encode_baud_rate(tty, baud, baud);
 635         } else {
 636                 quot = 0;
 637         }
 638
 639         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 640         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 641
 642         if (quot) {
 643                 info->MCR |= UART_MCR_DTR;
 644                 outb(info->MCR, info->ioaddr + UART_MCR);
 645         } else {
 646                 info->MCR &= ~UART_MCR_DTR;
 647                 outb(info->MCR, info->ioaddr + UART_MCR);
 648                 return 0;
 649         }
 650
 651         cval = inb(info->ioaddr + UART_LCR);
 652
 653         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 654
 655         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 656         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 657         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 658
 659 #ifdef BOTHER
 660         if (C_BAUD(tty) == BOTHER) {
 661                 quot = info->baud_base % newspd;
 662                 quot *= 8;
 663                 if (quot % newspd > newspd / 2) {
 664                         quot /= newspd;
 665                         quot++;
 666                 } else
 667                         quot /= newspd;
 668
 669                 mxser_set_must_enum_value(info->ioaddr, quot);
 670         } else
 671 #endif
 672                 mxser_set_must_enum_value(info->ioaddr, 0);
 673
 674         return 0;
 675 }
 676
 677 /*
 678  * This routine is called to set the UART divisor registers to match
 679  * the specified baud rate for a serial port.
 680  */
 681 static int mxser_change_speed(struct tty_struct *tty,
 682                                         struct ktermios *old_termios)
 683 {
 684         struct mxser_port *info = tty->driver_data;
 685         unsigned cflag, cval, fcr;
 686         int ret = 0;
 687         unsigned char status;
 688
 689         cflag = tty->termios->c_cflag;
 690         if (!info->ioaddr)
 691                 return ret;
 692
 693         if (mxser_set_baud_method[tty->index] == 0)
 694                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 695
 696         /* byte size and parity */
 697         switch (cflag & CSIZE) {
 698         case CS5:
 699                 cval = 0x00;
 700                 break;
 701         case CS6:
 702                 cval = 0x01;
 703                 break;
 704         case CS7:
 705                 cval = 0x02;
 706                 break;
 707         case CS8:
 708                 cval = 0x03;
 709                 break;
 710         default:
 711                 cval = 0x00;
 712                 break;          /* too keep GCC shut... */
 713         }
 714         if (cflag & CSTOPB)
 715                 cval |= 0x04;
 716         if (cflag & PARENB)
 717                 cval |= UART_LCR_PARITY;
 718         if (!(cflag & PARODD))
 719                 cval |= UART_LCR_EPAR;
 720         if (cflag & CMSPAR)
 721                 cval |= UART_LCR_SPAR;
 722
 723         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 724                 if (info->board->chip_flag) {
 725                         fcr = UART_FCR_ENABLE_FIFO;
 726                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 727                         mxser_set_must_fifo_value(info);
 728                 } else
 729                         fcr = 0;
 730         } else {
 731                 fcr = UART_FCR_ENABLE_FIFO;
 732                 if (info->board->chip_flag) {
 733                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 734                         mxser_set_must_fifo_value(info);
 735                 } else {
 736                         switch (info->rx_trigger) {
 737                         case 1:
 738                                 fcr |= UART_FCR_TRIGGER_1;
 739                                 break;
 740                         case 4:
 741                                 fcr |= UART_FCR_TRIGGER_4;
 742                                 break;
 743                         case 8:
 744                                 fcr |= UART_FCR_TRIGGER_8;
 745                                 break;
 746                         default:
 747                                 fcr |= UART_FCR_TRIGGER_14;
 748                                 break;
 749                         }
 750                 }
 751         }
 752
 753         /* CTS flow control flag and modem status interrupts */
 754         info->IER &= ~UART_IER_MSI;
 755         info->MCR &= ~UART_MCR_AFE;
 756         if (cflag & CRTSCTS) {
 757                 info->port.flags |= ASYNC_CTS_FLOW;
 758                 info->IER |= UART_IER_MSI;
 759                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 760                         info->MCR |= UART_MCR_AFE;
 761                 } else {
 762                         status = inb(info->ioaddr + UART_MSR);
 763                         if (tty->hw_stopped) {
 764                                 if (status & UART_MSR_CTS) {
 765                                         tty->hw_stopped = 0;
 766                                         if (info->type != PORT_16550A &&
 767                                                         !info->board->chip_flag) {
 768                                                 outb(info->IER & ~UART_IER_THRI,
 769                                                         info->ioaddr +
 770                                                         UART_IER);
 771                                                 info->IER |= UART_IER_THRI;
 772                                                 outb(info->IER, info->ioaddr +
 773                                                                 UART_IER);
 774                                         }
 775                                         tty_wakeup(tty);
 776                                 }
 777                         } else {
 778                                 if (!(status & UART_MSR_CTS)) {
 779                                         tty->hw_stopped = 1;
 780                                         if ((info->type != PORT_16550A) &&
 781                                                         (!info->board->chip_flag)) {
 782                                                 info->IER &= ~UART_IER_THRI;
 783                                                 outb(info->IER, info->ioaddr +
 784                                                                 UART_IER);
 785                                         }
 786                                 }
 787                         }
 788                 }
 789         } else {
 790                 info->port.flags &= ~ASYNC_CTS_FLOW;
 791         }
 792         outb(info->MCR, info->ioaddr + UART_MCR);
 793         if (cflag & CLOCAL) {
 794                 info->port.flags &= ~ASYNC_CHECK_CD;
 795         } else {
 796                 info->port.flags |= ASYNC_CHECK_CD;
 797                 info->IER |= UART_IER_MSI;
 798         }
 799         outb(info->IER, info->ioaddr + UART_IER);
 800
 801         /*
 802          * Set up parity check flag
 803          */
 804         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 805         if (I_INPCK(tty))
 806                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 807         if (I_BRKINT(tty) || I_PARMRK(tty))
 808                 info->read_status_mask |= UART_LSR_BI;
 809
 810         info->ignore_status_mask = 0;
 811
 812         if (I_IGNBRK(tty)) {
 813                 info->ignore_status_mask |= UART_LSR_BI;
 814                 info->read_status_mask |= UART_LSR_BI;
 815                 /*
 816                  * If we're ignore parity and break indicators, ignore
 817                  * overruns too.  (For real raw support).
 818                  */
 819                 if (I_IGNPAR(tty)) {
 820                         info->ignore_status_mask |=
 821                                                 UART_LSR_OE |
 822                                                 UART_LSR_PE |
 823                                                 UART_LSR_FE;
 824                         info->read_status_mask |=
 825                                                 UART_LSR_OE |
 826                                                 UART_LSR_PE |
 827                                                 UART_LSR_FE;
 828                 }
 829         }
 830         if (info->board->chip_flag) {
 831                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 832                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 833                 if (I_IXON(tty)) {
 834                         mxser_enable_must_rx_software_flow_control(
 835                                         info->ioaddr);
 836                 } else {
 837                         mxser_disable_must_rx_software_flow_control(
 838                                         info->ioaddr);
 839                 }
 840                 if (I_IXOFF(tty)) {
 841                         mxser_enable_must_tx_software_flow_control(
 842                                         info->ioaddr);
 843                 } else {
 844                         mxser_disable_must_tx_software_flow_control(
 845                                         info->ioaddr);
 846                 }
 847         }
 848
 849
 850         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 851         outb(cval, info->ioaddr + UART_LCR);
 852
 853         return ret;
 854 }
 855
 856 static void mxser_check_modem_status(struct tty_struct *tty,
 857                                 struct mxser_port *port, int status)
 858 {
 859         /* update input line counters */
 860         if (status & UART_MSR_TERI)
 861                 port->icount.rng++;
 862         if (status & UART_MSR_DDSR)
 863                 port->icount.dsr++;
 864         if (status & UART_MSR_DDCD)
 865                 port->icount.dcd++;
 866         if (status & UART_MSR_DCTS)
 867                 port->icount.cts++;
 868         port->mon_data.modem_status = status;
 869         wake_up_interruptible(&port->delta_msr_wait);
 870
 871         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 872                 if (status & UART_MSR_DCD)
 873                         wake_up_interruptible(&port->port.open_wait);
 874         }
 875
 876         tty = tty_port_tty_get(&port->port);
 877         if (port->port.flags & ASYNC_CTS_FLOW) {
 878                 if (tty->hw_stopped) {
 879                         if (status & UART_MSR_CTS) {
 880                                 tty->hw_stopped = 0;
 881
 882                                 if ((port->type != PORT_16550A) &&
 883                                                 (!port->board->chip_flag)) {
 884                                         outb(port->IER & ~UART_IER_THRI,
 885                                                 port->ioaddr + UART_IER);
 886                                         port->IER |= UART_IER_THRI;
 887                                         outb(port->IER, port->ioaddr +
 888                                                         UART_IER);
 889                                 }
 890                                 tty_wakeup(tty);
 891                         }
 892                 } else {
 893                         if (!(status & UART_MSR_CTS)) {
 894                                 tty->hw_stopped = 1;
 895                                 if (port->type != PORT_16550A &&
 896                                                 !port->board->chip_flag) {
 897                                         port->IER &= ~UART_IER_THRI;
 898                                         outb(port->IER, port->ioaddr +
 899                                                         UART_IER);
 900                                 }
 901                         }
 902                 }
 903         }
 904 }
 905
 906 static int mxser_startup(struct tty_struct *tty)
 907 {
 908         struct mxser_port *info = tty->driver_data;
 909         unsigned long page;
 910         unsigned long flags;
 911
 912         page = __get_free_page(GFP_KERNEL);
 913         if (!page)
 914                 return -ENOMEM;
 915
 916         spin_lock_irqsave(&info->slock, flags);
 917
 918         if (info->port.flags & ASYNC_INITIALIZED) {
 919                 free_page(page);
 920                 spin_unlock_irqrestore(&info->slock, flags);
 921                 return 0;
 922         }
 923
 924         if (!info->ioaddr || !info->type) {
 925                 set_bit(TTY_IO_ERROR, &tty->flags);
 926                 free_page(page);
 927                 spin_unlock_irqrestore(&info->slock, flags);
 928                 return 0;
 929         }
 930         if (info->port.xmit_buf)
 931                 free_page(page);
 932         else
 933                 info->port.xmit_buf = (unsigned char *) page;
 934
 935         /*
 936          * Clear the FIFO buffers and disable them
 937          * (they will be reenabled in mxser_change_speed())
 938          */
 939         if (info->board->chip_flag)
 940                 outb((UART_FCR_CLEAR_RCVR |
 941                         UART_FCR_CLEAR_XMIT |
 942                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 943         else
 944                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 945                         info->ioaddr + UART_FCR);
 946
 947         /*
 948          * At this point there's no way the LSR could still be 0xFF;
 949          * if it is, then bail out, because there's likely no UART
 950          * here.
 951          */
 952         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 953                 spin_unlock_irqrestore(&info->slock, flags);
 954                 if (capable(CAP_SYS_ADMIN)) {
 955                         if (tty)
 956                                 set_bit(TTY_IO_ERROR, &tty->flags);
 957                         return 0;
 958                 } else
 959                         return -ENODEV;
 960         }
 961
 962         /*
 963          * Clear the interrupt registers.
 964          */
 965         (void) inb(info->ioaddr + UART_LSR);
 966         (void) inb(info->ioaddr + UART_RX);
 967         (void) inb(info->ioaddr + UART_IIR);
 968         (void) inb(info->ioaddr + UART_MSR);
 969
 970         /*
 971          * Now, initialize the UART
 972          */
 973         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 974         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 975         outb(info->MCR, info->ioaddr + UART_MCR);
 976
 977         /*
 978          * Finally, enable interrupts
 979          */
 980         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 981
 982         if (info->board->chip_flag)
 983                 info->IER |= MOXA_MUST_IER_EGDAI;
 984         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 985
 986         /*
 987          * And clear the interrupt registers again for luck.
 988          */
 989         (void) inb(info->ioaddr + UART_LSR);
 990         (void) inb(info->ioaddr + UART_RX);
 991         (void) inb(info->ioaddr + UART_IIR);
 992         (void) inb(info->ioaddr + UART_MSR);
 993
 994         clear_bit(TTY_IO_ERROR, &tty->flags);
 995         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 996
 997         /*
 998          * and set the speed of the serial port
 999          */
1000         mxser_change_speed(tty, NULL);
1001         info->port.flags |= ASYNC_INITIALIZED;
1002         spin_unlock_irqrestore(&info->slock, flags);
1003
1004         return 0;
1005 }
1006
1007 /*
1008  * This routine will shutdown a serial port; interrupts maybe disabled, and
1009  * DTR is dropped if the hangup on close termio flag is on.
1010  */
1011 static void mxser_shutdown(struct tty_struct *tty)
1012 {
1013         struct mxser_port *info = tty->driver_data;
1014         unsigned long flags;
1015
1016         if (!(info->port.flags & ASYNC_INITIALIZED))
1017                 return;
1018
1019         spin_lock_irqsave(&info->slock, flags);
1020
1021         /*
1022          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1023          * here so the queue might never be waken up
1024          */
1025         wake_up_interruptible(&info->delta_msr_wait);
1026
1027         /*
1028          * Free the IRQ, if necessary
1029          */
1030         if (info->port.xmit_buf) {
1031                 free_page((unsigned long) info->port.xmit_buf);
1032                 info->port.xmit_buf = NULL;
1033         }
1034
1035         info->IER = 0;
1036         outb(0x00, info->ioaddr + UART_IER);
1037
1038         if (tty->termios->c_cflag & HUPCL)
1039                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1040         outb(info->MCR, info->ioaddr + UART_MCR);
1041
1042         /* clear Rx/Tx FIFO's */
1043         if (info->board->chip_flag)
1044                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1045                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1046                                 info->ioaddr + UART_FCR);
1047         else
1048                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1049                         info->ioaddr + UART_FCR);
1050
1051         /* read data port to reset things */
1052         (void) inb(info->ioaddr + UART_RX);
1053
1054         set_bit(TTY_IO_ERROR, &tty->flags);
1055
1056         info->port.flags &= ~ASYNC_INITIALIZED;
1057
1058         if (info->board->chip_flag)
1059                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1060
1061         spin_unlock_irqrestore(&info->slock, flags);
1062 }
1063
1064 /*
1065  * This routine is called whenever a serial port is opened.  It
1066  * enables interrupts for a serial port, linking in its async structure into
1067  * the IRQ chain.   It also performs the serial-specific
1068  * initialization for the tty structure.
1069  */
1070 static int mxser_open(struct tty_struct *tty, struct file *filp)
1071 {
1072         struct mxser_port *info;
1073         unsigned long flags;
1074         int retval, line;
1075
1076         line = tty->index;
1077         if (line == MXSER_PORTS)
1078                 return 0;
1079         if (line < 0 || line > MXSER_PORTS)
1080                 return -ENODEV;
1081         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1082         if (!info->ioaddr)
1083                 return -ENODEV;
1084
1085         tty->driver_data = info;
1086         tty_port_tty_set(&info->port, tty);
1087         /*
1088          * Start up serial port
1089          */
1090         spin_lock_irqsave(&info->slock, flags);
1091         info->port.count++;
1092         spin_unlock_irqrestore(&info->slock, flags);
1093         retval = mxser_startup(tty);
1094         if (retval)
1095                 return retval;
1096
1097         retval = mxser_block_til_ready(tty, filp, info);
1098         if (retval)
1099                 return retval;
1100
1101         /* unmark here for very high baud rate (ex. 921600 bps) used */
1102         tty->low_latency = 1;
1103         return 0;
1104 }
1105
1106 static void mxser_flush_buffer(struct tty_struct *tty)
1107 {
1108         struct mxser_port *info = tty->driver_data;
1109         char fcr;
1110         unsigned long flags;
1111
1112
1113         spin_lock_irqsave(&info->slock, flags);
1114         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1115
1116         fcr = inb(info->ioaddr + UART_FCR);
1117         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1118                 info->ioaddr + UART_FCR);
1119         outb(fcr, info->ioaddr + UART_FCR);
1120
1121         spin_unlock_irqrestore(&info->slock, flags);
1122
1123         tty_wakeup(tty);
1124 }
1125
1126
1127 /*
1128  * This routine is called when the serial port gets closed.  First, we
1129  * wait for the last remaining data to be sent.  Then, we unlink its
1130  * async structure from the interrupt chain if necessary, and we free
1131  * that IRQ if nothing is left in the chain.
1132  */
1133 static void mxser_close(struct tty_struct *tty, struct file *filp)
1134 {
1135         struct mxser_port *info = tty->driver_data;
1136
1137         unsigned long timeout;
1138         unsigned long flags;
1139
1140         if (tty->index == MXSER_PORTS)
1141                 return;
1142         if (!info)
1143                 return;
1144
1145         spin_lock_irqsave(&info->slock, flags);
1146
1147         if (tty_hung_up_p(filp)) {
1148                 spin_unlock_irqrestore(&info->slock, flags);
1149                 return;
1150         }
1151         if ((tty->count == 1) && (info->port.count != 1)) {
1152                 /*
1153                  * Uh, oh.  tty->count is 1, which means that the tty
1154                  * structure will be freed.  Info->port.count should always
1155                  * be one in these conditions.  If it's greater than
1156                  * one, we've got real problems, since it means the
1157                  * serial port won't be shutdown.
1158                  */
1159                 printk(KERN_ERR "mxser_close: bad serial port count; "
1160                         "tty->count is 1, info->port.count is %d\n", info->port.count);
1161                 info->port.count = 1;
1162         }
1163         if (--info->port.count < 0) {
1164                 printk(KERN_ERR "mxser_close: bad serial port count for "
1165                         "ttys%d: %d\n", tty->index, info->port.count);
1166                 info->port.count = 0;
1167         }
1168         if (info->port.count) {
1169                 spin_unlock_irqrestore(&info->slock, flags);
1170                 return;
1171         }
1172         info->port.flags |= ASYNC_CLOSING;
1173         spin_unlock_irqrestore(&info->slock, flags);
1174         /*
1175          * Save the termios structure, since this port may have
1176          * separate termios for callout and dialin.
1177          */
1178         if (info->port.flags & ASYNC_NORMAL_ACTIVE)
1179                 info->normal_termios = *tty->termios;
1180         /*
1181          * Now we wait for the transmit buffer to clear; and we notify
1182          * the line discipline to only process XON/XOFF characters.
1183          */
1184         tty->closing = 1;
1185         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1186                 tty_wait_until_sent(tty, info->port.closing_wait);
1187         /*
1188          * At this point we stop accepting input.  To do this, we
1189          * disable the receive line status interrupts, and tell the
1190          * interrupt driver to stop checking the data ready bit in the
1191          * line status register.
1192          */
1193         info->IER &= ~UART_IER_RLSI;
1194         if (info->board->chip_flag)
1195                 info->IER &= ~MOXA_MUST_RECV_ISR;
1196
1197         if (info->port.flags & ASYNC_INITIALIZED) {
1198                 outb(info->IER, info->ioaddr + UART_IER);
1199                 /*
1200                  * Before we drop DTR, make sure the UART transmitter
1201                  * has completely drained; this is especially
1202                  * important if there is a transmit FIFO!
1203                  */
1204                 timeout = jiffies + HZ;
1205                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1206                         schedule_timeout_interruptible(5);
1207                         if (time_after(jiffies, timeout))
1208                                 break;
1209                 }
1210         }
1211         mxser_shutdown(tty);
1212
1213         mxser_flush_buffer(tty);
1214         tty_ldisc_flush(tty);
1215
1216         tty->closing = 0;
1217         tty_port_tty_set(&info->port, NULL);
1218         if (info->port.blocked_open) {
1219                 if (info->port.close_delay)
1220                         schedule_timeout_interruptible(info->port.close_delay);
1221                 wake_up_interruptible(&info->port.open_wait);
1222         }
1223
1224         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1225 }
1226
1227 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1228 {
1229         int c, total = 0;
1230         struct mxser_port *info = tty->driver_data;
1231         unsigned long flags;
1232
1233         if (!info->port.xmit_buf)
1234                 return 0;
1235
1236         while (1) {
1237                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1238                                           SERIAL_XMIT_SIZE - info->xmit_head));
1239                 if (c <= 0)
1240                         break;
1241
1242                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1243                 spin_lock_irqsave(&info->slock, flags);
1244                 info->xmit_head = (info->xmit_head + c) &
1245                                   (SERIAL_XMIT_SIZE - 1);
1246                 info->xmit_cnt += c;
1247                 spin_unlock_irqrestore(&info->slock, flags);
1248
1249                 buf += c;
1250                 count -= c;
1251                 total += c;
1252         }
1253
1254         if (info->xmit_cnt && !tty->stopped) {
1255                 if (!tty->hw_stopped ||
1256                                 (info->type == PORT_16550A) ||
1257                                 (info->board->chip_flag)) {
1258                         spin_lock_irqsave(&info->slock, flags);
1259                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1260                                         UART_IER);
1261                         info->IER |= UART_IER_THRI;
1262                         outb(info->IER, info->ioaddr + UART_IER);
1263                         spin_unlock_irqrestore(&info->slock, flags);
1264                 }
1265         }
1266         return total;
1267 }
1268
1269 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1270 {
1271         struct mxser_port *info = tty->driver_data;
1272         unsigned long flags;
1273
1274         if (!info->port.xmit_buf)
1275                 return 0;
1276
1277         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1278                 return 0;
1279
1280         spin_lock_irqsave(&info->slock, flags);
1281         info->port.xmit_buf[info->xmit_head++] = ch;
1282         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1283         info->xmit_cnt++;
1284         spin_unlock_irqrestore(&info->slock, flags);
1285         if (!tty->stopped) {
1286                 if (!tty->hw_stopped ||
1287                                 (info->type == PORT_16550A) ||
1288                                 info->board->chip_flag) {
1289                         spin_lock_irqsave(&info->slock, flags);
1290                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1291                         info->IER |= UART_IER_THRI;
1292                         outb(info->IER, info->ioaddr + UART_IER);
1293                         spin_unlock_irqrestore(&info->slock, flags);
1294                 }
1295         }
1296         return 1;
1297 }
1298
1299
1300 static void mxser_flush_chars(struct tty_struct *tty)
1301 {
1302         struct mxser_port *info = tty->driver_data;
1303         unsigned long flags;
1304
1305         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1306                         (tty->hw_stopped && info->type != PORT_16550A &&
1307                          !info->board->chip_flag))
1308                 return;
1309
1310         spin_lock_irqsave(&info->slock, flags);
1311
1312         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1313         info->IER |= UART_IER_THRI;
1314         outb(info->IER, info->ioaddr + UART_IER);
1315
1316         spin_unlock_irqrestore(&info->slock, flags);
1317 }
1318
1319 static int mxser_write_room(struct tty_struct *tty)
1320 {
1321         struct mxser_port *info = tty->driver_data;
1322         int ret;
1323
1324         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1325         return ret < 0 ? 0 : ret;
1326 }
1327
1328 static int mxser_chars_in_buffer(struct tty_struct *tty)
1329 {
1330         struct mxser_port *info = tty->driver_data;
1331         return info->xmit_cnt;
1332 }
1333
1334 /*
1335  * ------------------------------------------------------------
1336  * friends of mxser_ioctl()
1337  * ------------------------------------------------------------
1338  */
1339 static int mxser_get_serial_info(struct tty_struct *tty,
1340                 struct serial_struct __user *retinfo)
1341 {
1342         struct mxser_port *info = tty->driver_data;
1343         struct serial_struct tmp = {
1344                 .type = info->type,
1345                 .line = tty->index,
1346                 .port = info->ioaddr,
1347                 .irq = info->board->irq,
1348                 .flags = info->port.flags,
1349                 .baud_base = info->baud_base,
1350                 .close_delay = info->port.close_delay,
1351                 .closing_wait = info->port.closing_wait,
1352                 .custom_divisor = info->custom_divisor,
1353                 .hub6 = 0
1354         };
1355         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1356                 return -EFAULT;
1357         return 0;
1358 }
1359
1360 static int mxser_set_serial_info(struct tty_struct *tty,
1361                 struct serial_struct __user *new_info)
1362 {
1363         struct mxser_port *info = tty->driver_data;
1364         struct serial_struct new_serial;
1365         speed_t baud;
1366         unsigned long sl_flags;
1367         unsigned int flags;
1368         int retval = 0;
1369
1370         if (!new_info || !info->ioaddr)
1371                 return -ENODEV;
1372         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1373                 return -EFAULT;
1374
1375         if (new_serial.irq != info->board->irq ||
1376                         new_serial.port != info->ioaddr)
1377                 return -EINVAL;
1378
1379         flags = info->port.flags & ASYNC_SPD_MASK;
1380
1381         if (!capable(CAP_SYS_ADMIN)) {
1382                 if ((new_serial.baud_base != info->baud_base) ||
1383                                 (new_serial.close_delay != info->port.close_delay) ||
1384                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1385                         return -EPERM;
1386                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1387                                 (new_serial.flags & ASYNC_USR_MASK));
1388         } else {
1389                 /*
1390                  * OK, past this point, all the error checking has been done.
1391                  * At this point, we start making changes.....
1392                  */
1393                 info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
1394                                 (new_serial.flags & ASYNC_FLAGS));
1395                 info->port.close_delay = new_serial.close_delay * HZ / 100;
1396                 info->port.closing_wait = new_serial.closing_wait * HZ / 100;
1397                 tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY)
1398                                                                 ? 1 : 0;
1399                 if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1400                                 (new_serial.baud_base != info->baud_base ||
1401                                 new_serial.custom_divisor !=
1402                                 info->custom_divisor)) {
1403                         baud = new_serial.baud_base / new_serial.custom_divisor;
1404                         tty_encode_baud_rate(tty, baud, baud);
1405                 }
1406         }
1407
1408         info->type = new_serial.type;
1409
1410         process_txrx_fifo(info);
1411
1412         if (info->port.flags & ASYNC_INITIALIZED) {
1413                 if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
1414                         spin_lock_irqsave(&info->slock, sl_flags);
1415                         mxser_change_speed(tty, NULL);
1416                         spin_unlock_irqrestore(&info->slock, sl_flags);
1417                 }
1418         } else
1419                 retval = mxser_startup(tty);
1420
1421         return retval;
1422 }
1423
1424 /*
1425  * mxser_get_lsr_info - get line status register info
1426  *
1427  * Purpose: Let user call ioctl() to get info when the UART physically
1428  *          is emptied.  On bus types like RS485, the transmitter must
1429  *          release the bus after transmitting. This must be done when
1430  *          the transmit shift register is empty, not be done when the
1431  *          transmit holding register is empty.  This functionality
1432  *          allows an RS485 driver to be written in user space.
1433  */
1434 static int mxser_get_lsr_info(struct mxser_port *info,
1435                 unsigned int __user *value)
1436 {
1437         unsigned char status;
1438         unsigned int result;
1439         unsigned long flags;
1440
1441         spin_lock_irqsave(&info->slock, flags);
1442         status = inb(info->ioaddr + UART_LSR);
1443         spin_unlock_irqrestore(&info->slock, flags);
1444         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1445         return put_user(result, value);
1446 }
1447
1448 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1449 {
1450         struct mxser_port *info = tty->driver_data;
1451         unsigned char control, status;
1452         unsigned long flags;
1453
1454
1455         if (tty->index == MXSER_PORTS)
1456                 return -ENOIOCTLCMD;
1457         if (test_bit(TTY_IO_ERROR, &tty->flags))
1458                 return -EIO;
1459
1460         control = info->MCR;
1461
1462         spin_lock_irqsave(&info->slock, flags);
1463         status = inb(info->ioaddr + UART_MSR);
1464         if (status & UART_MSR_ANY_DELTA)
1465                 mxser_check_modem_status(tty, info, status);
1466         spin_unlock_irqrestore(&info->slock, flags);
1467         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1468                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1469                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1470                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1471                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1472                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1473 }
1474
1475 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1476                 unsigned int set, unsigned int clear)
1477 {
1478         struct mxser_port *info = tty->driver_data;
1479         unsigned long flags;
1480
1481
1482         if (tty->index == MXSER_PORTS)
1483                 return -ENOIOCTLCMD;
1484         if (test_bit(TTY_IO_ERROR, &tty->flags))
1485                 return -EIO;
1486
1487         spin_lock_irqsave(&info->slock, flags);
1488
1489         if (set & TIOCM_RTS)
1490                 info->MCR |= UART_MCR_RTS;
1491         if (set & TIOCM_DTR)
1492                 info->MCR |= UART_MCR_DTR;
1493
1494         if (clear & TIOCM_RTS)
1495                 info->MCR &= ~UART_MCR_RTS;
1496         if (clear & TIOCM_DTR)
1497                 info->MCR &= ~UART_MCR_DTR;
1498
1499         outb(info->MCR, info->ioaddr + UART_MCR);
1500         spin_unlock_irqrestore(&info->slock, flags);
1501         return 0;
1502 }
1503
1504 static int __init mxser_program_mode(int port)
1505 {
1506         int id, i, j, n;
1507
1508         outb(0, port);
1509         outb(0, port);
1510         outb(0, port);
1511         (void)inb(port);
1512         (void)inb(port);
1513         outb(0, port);
1514         (void)inb(port);
1515
1516         id = inb(port + 1) & 0x1F;
1517         if ((id != C168_ASIC_ID) &&
1518                         (id != C104_ASIC_ID) &&
1519                         (id != C102_ASIC_ID) &&
1520                         (id != CI132_ASIC_ID) &&
1521                         (id != CI134_ASIC_ID) &&
1522                         (id != CI104J_ASIC_ID))
1523                 return -1;
1524         for (i = 0, j = 0; i < 4; i++) {
1525                 n = inb(port + 2);
1526                 if (n == 'M') {
1527                         j = 1;
1528                 } else if ((j == 1) && (n == 1)) {
1529                         j = 2;
1530                         break;
1531                 } else
1532                         j = 0;
1533         }
1534         if (j != 2)
1535                 id = -2;
1536         return id;
1537 }
1538
1539 static void __init mxser_normal_mode(int port)
1540 {
1541         int i, n;
1542
1543         outb(0xA5, port + 1);
1544         outb(0x80, port + 3);
1545         outb(12, port + 0);     /* 9600 bps */
1546         outb(0, port + 1);
1547         outb(0x03, port + 3);   /* 8 data bits */
1548         outb(0x13, port + 4);   /* loop back mode */
1549         for (i = 0; i < 16; i++) {
1550                 n = inb(port + 5);
1551                 if ((n & 0x61) == 0x60)
1552                         break;
1553                 if ((n & 1) == 1)
1554                         (void)inb(port);
1555         }
1556         outb(0x00, port + 4);
1557 }
1558
1559 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1560 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1561 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1562 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1563 #define EN_CCMD         0x000   /* Chip's command register     */
1564 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1565 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1566 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1567 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1568 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1569 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1570 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1571 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1572 static int __init mxser_read_register(int port, unsigned short *regs)
1573 {
1574         int i, k, value, id;
1575         unsigned int j;
1576
1577         id = mxser_program_mode(port);
1578         if (id < 0)
1579                 return id;
1580         for (i = 0; i < 14; i++) {
1581                 k = (i & 0x3F) | 0x180;
1582                 for (j = 0x100; j > 0; j >>= 1) {
1583                         outb(CHIP_CS, port);
1584                         if (k & j) {
1585                                 outb(CHIP_CS | CHIP_DO, port);
1586                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1587                         } else {
1588                                 outb(CHIP_CS, port);
1589                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1590                         }
1591                 }
1592                 (void)inb(port);
1593                 value = 0;
1594                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1595                         outb(CHIP_CS, port);
1596                         outb(CHIP_CS | CHIP_SK, port);
1597                         if (inb(port) & CHIP_DI)
1598                                 value |= j;
1599                 }
1600                 regs[i] = value;
1601                 outb(0, port);
1602         }
1603         mxser_normal_mode(port);
1604         return id;
1605 }
1606
1607 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1608 {
1609         struct mxser_port *port;
1610         struct tty_struct *tty;
1611         int result, status;
1612         unsigned int i, j;
1613         int ret = 0;
1614
1615         switch (cmd) {
1616         case MOXA_GET_MAJOR:
1617                 if (printk_ratelimit())
1618                         printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1619                                         "%x (GET_MAJOR), fix your userspace\n",
1620                                         current->comm, cmd);
1621                 return put_user(ttymajor, (int __user *)argp);
1622
1623         case MOXA_CHKPORTENABLE:
1624                 result = 0;
1625                 lock_kernel();
1626                 for (i = 0; i < MXSER_BOARDS; i++)
1627                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1628                                 if (mxser_boards[i].ports[j].ioaddr)
1629                                         result |= (1 << i);
1630                 unlock_kernel();
1631                 return put_user(result, (unsigned long __user *)argp);
1632         case MOXA_GETDATACOUNT:
1633                 lock_kernel();
1634                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1635                         ret = -EFAULT;
1636                 unlock_kernel();
1637                 return ret;
1638         case MOXA_GETMSTATUS: {
1639                 struct mxser_mstatus ms, __user *msu = argp;
1640                 lock_kernel();
1641                 for (i = 0; i < MXSER_BOARDS; i++)
1642                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1643                                 port = &mxser_boards[i].ports[j];
1644                                 memset(&ms, 0, sizeof(ms));
1645
1646                                 if (!port->ioaddr)
1647                                         goto copy;
1648
1649                                 tty = tty_port_tty_get(&port->port);
1650
1651                                 if (!tty || !tty->termios)
1652                                         ms.cflag = port->normal_termios.c_cflag;
1653                                 else
1654                                         ms.cflag = tty->termios->c_cflag;
1655                                 tty_kref_put(tty);
1656                                 status = inb(port->ioaddr + UART_MSR);
1657                                 if (status & UART_MSR_DCD)
1658                                         ms.dcd = 1;
1659                                 if (status & UART_MSR_DSR)
1660                                         ms.dsr = 1;
1661                                 if (status & UART_MSR_CTS)
1662                                         ms.cts = 1;
1663                         copy:
1664                                 if (copy_to_user(msu, &ms, sizeof(ms))) {
1665                                         unlock_kernel();
1666                                         return -EFAULT;
1667                                 }
1668                                 msu++;
1669                         }
1670                 unlock_kernel();
1671                 return 0;
1672         }
1673         case MOXA_ASPP_MON_EXT: {
1674                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1675                 unsigned int cflag, iflag, p;
1676                 u8 opmode;
1677
1678                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1679                 if (!me)
1680                         return -ENOMEM;
1681
1682                 lock_kernel();
1683                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1684                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1685                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1686                                         i = MXSER_BOARDS;
1687                                         break;
1688                                 }
1689                                 port = &mxser_boards[i].ports[j];
1690                                 if (!port->ioaddr)
1691                                         continue;
1692
1693                                 status = mxser_get_msr(port->ioaddr, 0, p);
1694
1695                                 if (status & UART_MSR_TERI)
1696                                         port->icount.rng++;
1697                                 if (status & UART_MSR_DDSR)
1698                                         port->icount.dsr++;
1699                                 if (status & UART_MSR_DDCD)
1700                                         port->icount.dcd++;
1701                                 if (status & UART_MSR_DCTS)
1702                                         port->icount.cts++;
1703
1704                                 port->mon_data.modem_status = status;
1705                                 me->rx_cnt[p] = port->mon_data.rxcnt;
1706                                 me->tx_cnt[p] = port->mon_data.txcnt;
1707                                 me->up_rxcnt[p] = port->mon_data.up_rxcnt;
1708                                 me->up_txcnt[p] = port->mon_data.up_txcnt;
1709                                 me->modem_status[p] =
1710                                         port->mon_data.modem_status;
1711                                 tty = tty_port_tty_get(&port->port);
1712
1713                                 if (!tty || !tty->termios) {
1714                                         cflag = port->normal_termios.c_cflag;
1715                                         iflag = port->normal_termios.c_iflag;
1716                                         me->baudrate[p] = tty_termios_baud_rate(&port->normal_termios);
1717                                 } else {
1718                                         cflag = tty->termios->c_cflag;
1719                                         iflag = tty->termios->c_iflag;
1720                                         me->baudrate[p] = tty_get_baud_rate(tty);
1721                                 }
1722                                 tty_kref_put(tty);
1723
1724                                 me->databits[p] = cflag & CSIZE;
1725                                 me->stopbits[p] = cflag & CSTOPB;
1726                                 me->parity[p] = cflag & (PARENB | PARODD |
1727                                                 CMSPAR);
1728
1729                                 if (cflag & CRTSCTS)
1730                                         me->flowctrl[p] |= 0x03;
1731
1732                                 if (iflag & (IXON | IXOFF))
1733                                         me->flowctrl[p] |= 0x0C;
1734
1735                                 if (port->type == PORT_16550A)
1736                                         me->fifo[p] = 1;
1737
1738                                 opmode = inb(port->opmode_ioaddr) >>
1739                                                 ((p % 4) * 2);
1740                                 opmode &= OP_MODE_MASK;
1741                                 me->iftype[p] = opmode;
1742                         }
1743                 }
1744                 unlock_kernel();
1745                 if (copy_to_user(argp, me, sizeof(*me)))
1746                         ret = -EFAULT;
1747                 kfree(me);
1748                 return ret;
1749         }
1750         default:
1751                 return -ENOIOCTLCMD;
1752         }
1753         return 0;
1754 }
1755
1756 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1757                 struct async_icount *cprev)
1758 {
1759         struct async_icount cnow;
1760         unsigned long flags;
1761         int ret;
1762
1763         spin_lock_irqsave(&info->slock, flags);
1764         cnow = info->icount;    /* atomic copy */
1765         spin_unlock_irqrestore(&info->slock, flags);
1766
1767         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1768                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1769                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1770                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1771
1772         *cprev = cnow;
1773
1774         return ret;
1775 }
1776
1777 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1778                 unsigned int cmd, unsigned long arg)
1779 {
1780         struct mxser_port *info = tty->driver_data;
1781         struct async_icount cnow;
1782         unsigned long flags;
1783         void __user *argp = (void __user *)arg;
1784         int retval;
1785
1786         if (tty->index == MXSER_PORTS)
1787                 return mxser_ioctl_special(cmd, argp);
1788
1789         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1790                 int p;
1791                 unsigned long opmode;
1792                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1793                 int shiftbit;
1794                 unsigned char val, mask;
1795
1796                 p = tty->index % 4;
1797                 if (cmd == MOXA_SET_OP_MODE) {
1798                         if (get_user(opmode, (int __user *) argp))
1799                                 return -EFAULT;
1800                         if (opmode != RS232_MODE &&
1801                                         opmode != RS485_2WIRE_MODE &&
1802                                         opmode != RS422_MODE &&
1803                                         opmode != RS485_4WIRE_MODE)
1804                                 return -EFAULT;
1805                         lock_kernel();
1806                         mask = ModeMask[p];
1807                         shiftbit = p * 2;
1808                         val = inb(info->opmode_ioaddr);
1809                         val &= mask;
1810                         val |= (opmode << shiftbit);
1811                         outb(val, info->opmode_ioaddr);
1812                         unlock_kernel();
1813                 } else {
1814                         lock_kernel();
1815                         shiftbit = p * 2;
1816                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1817                         opmode &= OP_MODE_MASK;
1818                         unlock_kernel();
1819                         if (put_user(opmode, (int __user *)argp))
1820                                 return -EFAULT;
1821                 }
1822                 return 0;
1823         }
1824
1825         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1826                         test_bit(TTY_IO_ERROR, &tty->flags))
1827                 return -EIO;
1828
1829         switch (cmd) {
1830         case TIOCGSERIAL:
1831                 lock_kernel();
1832                 retval = mxser_get_serial_info(tty, argp);
1833                 unlock_kernel();
1834                 return retval;
1835         case TIOCSSERIAL:
1836                 lock_kernel();
1837                 retval = mxser_set_serial_info(tty, argp);
1838                 unlock_kernel();
1839                 return retval;
1840         case TIOCSERGETLSR:     /* Get line status register */
1841                 return  mxser_get_lsr_info(info, argp);
1842                 /*
1843                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1844                  * - mask passed in arg for lines of interest
1845                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1846                  * Caller should use TIOCGICOUNT to see which one it was
1847                  */
1848         case TIOCMIWAIT:
1849                 spin_lock_irqsave(&info->slock, flags);
1850                 cnow = info->icount;    /* note the counters on entry */
1851                 spin_unlock_irqrestore(&info->slock, flags);
1852
1853                 return wait_event_interruptible(info->delta_msr_wait,
1854                                 mxser_cflags_changed(info, arg, &cnow));
1855         /*
1856          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1857          * Return: write counters to the user passed counter struct
1858          * NB: both 1->0 and 0->1 transitions are counted except for
1859          *     RI where only 0->1 is counted.
1860          */
1861         case TIOCGICOUNT: {
1862                 struct serial_icounter_struct icnt = { 0 };
1863                 spin_lock_irqsave(&info->slock, flags);
1864                 cnow = info->icount;
1865                 spin_unlock_irqrestore(&info->slock, flags);
1866
1867                 icnt.frame = cnow.frame;
1868                 icnt.brk = cnow.brk;
1869                 icnt.overrun = cnow.overrun;
1870                 icnt.buf_overrun = cnow.buf_overrun;
1871                 icnt.parity = cnow.parity;
1872                 icnt.rx = cnow.rx;
1873                 icnt.tx = cnow.tx;
1874                 icnt.cts = cnow.cts;
1875                 icnt.dsr = cnow.dsr;
1876                 icnt.rng = cnow.rng;
1877                 icnt.dcd = cnow.dcd;
1878
1879                 return copy_to_user(argp, &icnt, sizeof(icnt)) ? -EFAULT : 0;
1880         }
1881         case MOXA_HighSpeedOn:
1882                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1883         case MOXA_SDS_RSTICOUNTER:
1884                 lock_kernel();
1885                 info->mon_data.rxcnt = 0;
1886                 info->mon_data.txcnt = 0;
1887                 unlock_kernel();
1888                 return 0;
1889
1890         case MOXA_ASPP_OQUEUE:{
1891                 int len, lsr;
1892
1893                 lock_kernel();
1894                 len = mxser_chars_in_buffer(tty);
1895                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1896                 len += (lsr ? 0 : 1);
1897                 unlock_kernel();
1898
1899                 return put_user(len, (int __user *)argp);
1900         }
1901         case MOXA_ASPP_MON: {
1902                 int mcr, status;
1903
1904                 lock_kernel();
1905                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1906                 mxser_check_modem_status(tty, info, status);
1907
1908                 mcr = inb(info->ioaddr + UART_MCR);
1909                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1910                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1911                 else
1912                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1913
1914                 if (mcr & MOXA_MUST_MCR_TX_XON)
1915                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1916                 else
1917                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1918
1919                 if (tty->hw_stopped)
1920                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1921                 else
1922                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1923                 unlock_kernel();
1924                 if (copy_to_user(argp, &info->mon_data,
1925                                 sizeof(struct mxser_mon)))
1926                         return -EFAULT;
1927
1928                 return 0;
1929         }
1930         case MOXA_ASPP_LSTATUS: {
1931                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1932                         return -EFAULT;
1933
1934                 info->err_shadow = 0;
1935                 return 0;
1936         }
1937         case MOXA_SET_BAUD_METHOD: {
1938                 int method;
1939
1940                 if (get_user(method, (int __user *)argp))
1941                         return -EFAULT;
1942                 mxser_set_baud_method[tty->index] = method;
1943                 return put_user(method, (int __user *)argp);
1944         }
1945         default:
1946                 return -ENOIOCTLCMD;
1947         }
1948         return 0;
1949 }
1950
1951 static void mxser_stoprx(struct tty_struct *tty)
1952 {
1953         struct mxser_port *info = tty->driver_data;
1954
1955         info->ldisc_stop_rx = 1;
1956         if (I_IXOFF(tty)) {
1957                 if (info->board->chip_flag) {
1958                         info->IER &= ~MOXA_MUST_RECV_ISR;
1959                         outb(info->IER, info->ioaddr + UART_IER);
1960                 } else {
1961                         info->x_char = STOP_CHAR(tty);
1962                         outb(0, info->ioaddr + UART_IER);
1963                         info->IER |= UART_IER_THRI;
1964                         outb(info->IER, info->ioaddr + UART_IER);
1965                 }
1966         }
1967
1968         if (tty->termios->c_cflag & CRTSCTS) {
1969                 info->MCR &= ~UART_MCR_RTS;
1970                 outb(info->MCR, info->ioaddr + UART_MCR);
1971         }
1972 }
1973
1974 /*
1975  * This routine is called by the upper-layer tty layer to signal that
1976  * incoming characters should be throttled.
1977  */
1978 static void mxser_throttle(struct tty_struct *tty)
1979 {
1980         mxser_stoprx(tty);
1981 }
1982
1983 static void mxser_unthrottle(struct tty_struct *tty)
1984 {
1985         struct mxser_port *info = tty->driver_data;
1986
1987         /* startrx */
1988         info->ldisc_stop_rx = 0;
1989         if (I_IXOFF(tty)) {
1990                 if (info->x_char)
1991                         info->x_char = 0;
1992                 else {
1993                         if (info->board->chip_flag) {
1994                                 info->IER |= MOXA_MUST_RECV_ISR;
1995                                 outb(info->IER, info->ioaddr + UART_IER);
1996                         } else {
1997                                 info->x_char = START_CHAR(tty);
1998                                 outb(0, info->ioaddr + UART_IER);
1999                                 info->IER |= UART_IER_THRI;
2000                                 outb(info->IER, info->ioaddr + UART_IER);
2001                         }
2002                 }
2003         }
2004
2005         if (tty->termios->c_cflag & CRTSCTS) {
2006                 info->MCR |= UART_MCR_RTS;
2007                 outb(info->MCR, info->ioaddr + UART_MCR);
2008         }
2009 }
2010
2011 /*
2012  * mxser_stop() and mxser_start()
2013  *
2014  * This routines are called before setting or resetting tty->stopped.
2015  * They enable or disable transmitter interrupts, as necessary.
2016  */
2017 static void mxser_stop(struct tty_struct *tty)
2018 {
2019         struct mxser_port *info = tty->driver_data;
2020         unsigned long flags;
2021
2022         spin_lock_irqsave(&info->slock, flags);
2023         if (info->IER & UART_IER_THRI) {
2024                 info->IER &= ~UART_IER_THRI;
2025                 outb(info->IER, info->ioaddr + UART_IER);
2026         }
2027         spin_unlock_irqrestore(&info->slock, flags);
2028 }
2029
2030 static void mxser_start(struct tty_struct *tty)
2031 {
2032         struct mxser_port *info = tty->driver_data;
2033         unsigned long flags;
2034
2035         spin_lock_irqsave(&info->slock, flags);
2036         if (info->xmit_cnt && info->port.xmit_buf) {
2037                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2038                 info->IER |= UART_IER_THRI;
2039                 outb(info->IER, info->ioaddr + UART_IER);
2040         }
2041         spin_unlock_irqrestore(&info->slock, flags);
2042 }
2043
2044 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2045 {
2046         struct mxser_port *info = tty->driver_data;
2047         unsigned long flags;
2048
2049         spin_lock_irqsave(&info->slock, flags);
2050         mxser_change_speed(tty, old_termios);
2051         spin_unlock_irqrestore(&info->slock, flags);
2052
2053         if ((old_termios->c_cflag & CRTSCTS) &&
2054                         !(tty->termios->c_cflag & CRTSCTS)) {
2055                 tty->hw_stopped = 0;
2056                 mxser_start(tty);
2057         }
2058
2059         /* Handle sw stopped */
2060         if ((old_termios->c_iflag & IXON) &&
2061                         !(tty->termios->c_iflag & IXON)) {
2062                 tty->stopped = 0;
2063
2064                 if (info->board->chip_flag) {
2065                         spin_lock_irqsave(&info->slock, flags);
2066                         mxser_disable_must_rx_software_flow_control(
2067                                         info->ioaddr);
2068                         spin_unlock_irqrestore(&info->slock, flags);
2069                 }
2070
2071                 mxser_start(tty);
2072         }
2073 }
2074
2075 /*
2076  * mxser_wait_until_sent() --- wait until the transmitter is empty
2077  */
2078 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2079 {
2080         struct mxser_port *info = tty->driver_data;
2081         unsigned long orig_jiffies, char_time;
2082         int lsr;
2083
2084         if (info->type == PORT_UNKNOWN)
2085                 return;
2086
2087         if (info->xmit_fifo_size == 0)
2088                 return;         /* Just in case.... */
2089
2090         orig_jiffies = jiffies;
2091         /*
2092          * Set the check interval to be 1/5 of the estimated time to
2093          * send a single character, and make it at least 1.  The check
2094          * interval should also be less than the timeout.
2095          *
2096          * Note: we have to use pretty tight timings here to satisfy
2097          * the NIST-PCTS.
2098          */
2099         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2100         char_time = char_time / 5;
2101         if (char_time == 0)
2102                 char_time = 1;
2103         if (timeout && timeout < char_time)
2104                 char_time = timeout;
2105         /*
2106          * If the transmitter hasn't cleared in twice the approximate
2107          * amount of time to send the entire FIFO, it probably won't
2108          * ever clear.  This assumes the UART isn't doing flow
2109          * control, which is currently the case.  Hence, if it ever
2110          * takes longer than info->timeout, this is probably due to a
2111          * UART bug of some kind.  So, we clamp the timeout parameter at
2112          * 2*info->timeout.
2113          */
2114         if (!timeout || timeout > 2 * info->timeout)
2115                 timeout = 2 * info->timeout;
2116 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2117         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2118                 timeout, char_time);
2119         printk("jiff=%lu...", jiffies);
2120 #endif
2121         lock_kernel();
2122         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2123 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2124                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2125 #endif
2126                 schedule_timeout_interruptible(char_time);
2127                 if (signal_pending(current))
2128                         break;
2129                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2130                         break;
2131         }
2132         set_current_state(TASK_RUNNING);
2133         unlock_kernel();
2134
2135 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2136         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2137 #endif
2138 }
2139
2140 /*
2141  * This routine is called by tty_hangup() when a hangup is signaled.
2142  */
2143 static void mxser_hangup(struct tty_struct *tty)
2144 {
2145         struct mxser_port *info = tty->driver_data;
2146
2147         mxser_flush_buffer(tty);
2148         mxser_shutdown(tty);
2149         info->port.count = 0;
2150         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2151         tty_port_tty_set(&info->port, NULL);
2152         wake_up_interruptible(&info->port.open_wait);
2153 }
2154
2155 /*
2156  * mxser_rs_break() --- routine which turns the break handling on or off
2157  */
2158 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2159 {
2160         struct mxser_port *info = tty->driver_data;
2161         unsigned long flags;
2162
2163         spin_lock_irqsave(&info->slock, flags);
2164         if (break_state == -1)
2165                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2166                         info->ioaddr + UART_LCR);
2167         else
2168                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2169                         info->ioaddr + UART_LCR);
2170         spin_unlock_irqrestore(&info->slock, flags);
2171         return 0;
2172 }
2173
2174 static void mxser_receive_chars(struct tty_struct *tty,
2175                                 struct mxser_port *port, int *status)
2176 {
2177         unsigned char ch, gdl;
2178         int ignored = 0;
2179         int cnt = 0;
2180         int recv_room;
2181         int max = 256;
2182
2183         recv_room = tty->receive_room;
2184         if (recv_room == 0 && !port->ldisc_stop_rx)
2185                 mxser_stoprx(tty);
2186         if (port->board->chip_flag != MOXA_OTHER_UART) {
2187
2188                 if (*status & UART_LSR_SPECIAL)
2189                         goto intr_old;
2190                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2191                                 (*status & MOXA_MUST_LSR_RERR))
2192                         goto intr_old;
2193                 if (*status & MOXA_MUST_LSR_RERR)
2194                         goto intr_old;
2195
2196                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2197
2198                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2199                         gdl &= MOXA_MUST_GDL_MASK;
2200                 if (gdl >= recv_room) {
2201                         if (!port->ldisc_stop_rx)
2202                                 mxser_stoprx(tty);
2203                 }
2204                 while (gdl--) {
2205                         ch = inb(port->ioaddr + UART_RX);
2206                         tty_insert_flip_char(tty, ch, 0);
2207                         cnt++;
2208                 }
2209                 goto end_intr;
2210         }
2211 intr_old:
2212
2213         do {
2214                 if (max-- < 0)
2215                         break;
2216
2217                 ch = inb(port->ioaddr + UART_RX);
2218                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2219                         outb(0x23, port->ioaddr + UART_FCR);
2220                 *status &= port->read_status_mask;
2221                 if (*status & port->ignore_status_mask) {
2222                         if (++ignored > 100)
2223                                 break;
2224                 } else {
2225                         char flag = 0;
2226                         if (*status & UART_LSR_SPECIAL) {
2227                                 if (*status & UART_LSR_BI) {
2228                                         flag = TTY_BREAK;
2229                                         port->icount.brk++;
2230
2231                                         if (port->port.flags & ASYNC_SAK)
2232                                                 do_SAK(tty);
2233                                 } else if (*status & UART_LSR_PE) {
2234                                         flag = TTY_PARITY;
2235                                         port->icount.parity++;
2236                                 } else if (*status & UART_LSR_FE) {
2237                                         flag = TTY_FRAME;
2238                                         port->icount.frame++;
2239                                 } else if (*status & UART_LSR_OE) {
2240                                         flag = TTY_OVERRUN;
2241                                         port->icount.overrun++;
2242                                 } else
2243                                         flag = TTY_BREAK;
2244                         }
2245                         tty_insert_flip_char(tty, ch, flag);
2246                         cnt++;
2247                         if (cnt >= recv_room) {
2248                                 if (!port->ldisc_stop_rx)
2249                                         mxser_stoprx(tty);
2250                                 break;
2251                         }
2252
2253                 }
2254
2255                 if (port->board->chip_flag)
2256                         break;
2257
2258                 *status = inb(port->ioaddr + UART_LSR);
2259         } while (*status & UART_LSR_DR);
2260
2261 end_intr:
2262         mxvar_log.rxcnt[tty->index] += cnt;
2263         port->mon_data.rxcnt += cnt;
2264         port->mon_data.up_rxcnt += cnt;
2265
2266         /*
2267          * We are called from an interrupt context with &port->slock
2268          * being held. Drop it temporarily in order to prevent
2269          * recursive locking.
2270          */
2271         spin_unlock(&port->slock);
2272         tty_flip_buffer_push(tty);
2273         spin_lock(&port->slock);
2274 }
2275
2276 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2277 {
2278         int count, cnt;
2279
2280         if (port->x_char) {
2281                 outb(port->x_char, port->ioaddr + UART_TX);
2282                 port->x_char = 0;
2283                 mxvar_log.txcnt[tty->index]++;
2284                 port->mon_data.txcnt++;
2285                 port->mon_data.up_txcnt++;
2286                 port->icount.tx++;
2287                 return;
2288         }
2289
2290         if (port->port.xmit_buf == NULL)
2291                 return;
2292
2293         if (port->xmit_cnt <= 0 || tty->stopped ||
2294                         (tty->hw_stopped &&
2295                         (port->type != PORT_16550A) &&
2296                         (!port->board->chip_flag))) {
2297                 port->IER &= ~UART_IER_THRI;
2298                 outb(port->IER, port->ioaddr + UART_IER);
2299                 return;
2300         }
2301
2302         cnt = port->xmit_cnt;
2303         count = port->xmit_fifo_size;
2304         do {
2305                 outb(port->port.xmit_buf[port->xmit_tail++],
2306                         port->ioaddr + UART_TX);
2307                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2308                 if (--port->xmit_cnt <= 0)
2309                         break;
2310         } while (--count > 0);
2311         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2312
2313         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2314         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2315         port->icount.tx += (cnt - port->xmit_cnt);
2316
2317         if (port->xmit_cnt < WAKEUP_CHARS && tty)
2318                 tty_wakeup(tty);
2319
2320         if (port->xmit_cnt <= 0) {
2321                 port->IER &= ~UART_IER_THRI;
2322                 outb(port->IER, port->ioaddr + UART_IER);
2323         }
2324 }
2325
2326 /*
2327  * This is the serial driver's generic interrupt routine
2328  */
2329 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2330 {
2331         int status, iir, i;
2332         struct mxser_board *brd = NULL;
2333         struct mxser_port *port;
2334         int max, irqbits, bits, msr;
2335         unsigned int int_cnt, pass_counter = 0;
2336         int handled = IRQ_NONE;
2337         struct tty_struct *tty;
2338
2339         for (i = 0; i < MXSER_BOARDS; i++)
2340                 if (dev_id == &mxser_boards[i]) {
2341                         brd = dev_id;
2342                         break;
2343                 }
2344
2345         if (i == MXSER_BOARDS)
2346                 goto irq_stop;
2347         if (brd == NULL)
2348                 goto irq_stop;
2349         max = brd->info->nports;
2350         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2351                 irqbits = inb(brd->vector) & brd->vector_mask;
2352                 if (irqbits == brd->vector_mask)
2353                         break;
2354
2355                 handled = IRQ_HANDLED;
2356                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2357                         if (irqbits == brd->vector_mask)
2358                                 break;
2359                         if (bits & irqbits)
2360                                 continue;
2361                         port = &brd->ports[i];
2362
2363                         int_cnt = 0;
2364                         spin_lock(&port->slock);
2365                         do {
2366                                 iir = inb(port->ioaddr + UART_IIR);
2367                                 if (iir & UART_IIR_NO_INT)
2368                                         break;
2369                                 iir &= MOXA_MUST_IIR_MASK;
2370                                 tty = tty_port_tty_get(&port->port);
2371                                 if (!tty ||
2372                                                 (port->port.flags & ASYNC_CLOSING) ||
2373                                                 !(port->port.flags &
2374                                                         ASYNC_INITIALIZED)) {
2375                                         status = inb(port->ioaddr + UART_LSR);
2376                                         outb(0x27, port->ioaddr + UART_FCR);
2377                                         inb(port->ioaddr + UART_MSR);
2378                                         tty_kref_put(tty);
2379                                         break;
2380                                 }
2381
2382                                 status = inb(port->ioaddr + UART_LSR);
2383
2384                                 if (status & UART_LSR_PE)
2385                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2386                                 if (status & UART_LSR_FE)
2387                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2388                                 if (status & UART_LSR_OE)
2389                                         port->err_shadow |=
2390                                                 NPPI_NOTIFY_HW_OVERRUN;
2391                                 if (status & UART_LSR_BI)
2392                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2393
2394                                 if (port->board->chip_flag) {
2395                                         if (iir == MOXA_MUST_IIR_GDA ||
2396                                             iir == MOXA_MUST_IIR_RDA ||
2397                                             iir == MOXA_MUST_IIR_RTO ||
2398                                             iir == MOXA_MUST_IIR_LSR)
2399                                                 mxser_receive_chars(tty, port,
2400                                                                 &status);
2401
2402                                 } else {
2403                                         status &= port->read_status_mask;
2404                                         if (status & UART_LSR_DR)
2405                                                 mxser_receive_chars(tty, port,
2406                                                                 &status);
2407                                 }
2408                                 msr = inb(port->ioaddr + UART_MSR);
2409                                 if (msr & UART_MSR_ANY_DELTA)
2410                                         mxser_check_modem_status(tty, port, msr);
2411
2412                                 if (port->board->chip_flag) {
2413                                         if (iir == 0x02 && (status &
2414                                                                 UART_LSR_THRE))
2415                                                 mxser_transmit_chars(tty, port);
2416                                 } else {
2417                                         if (status & UART_LSR_THRE)
2418                                                 mxser_transmit_chars(tty, port);
2419                                 }
2420                                 tty_kref_put(tty);
2421                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2422                         spin_unlock(&port->slock);
2423                 }
2424         }
2425
2426 irq_stop:
2427         return handled;
2428 }
2429
2430 static const struct tty_operations mxser_ops = {
2431         .open = mxser_open,
2432         .close = mxser_close,
2433         .write = mxser_write,
2434         .put_char = mxser_put_char,
2435         .flush_chars = mxser_flush_chars,
2436         .write_room = mxser_write_room,
2437         .chars_in_buffer = mxser_chars_in_buffer,
2438         .flush_buffer = mxser_flush_buffer,
2439         .ioctl = mxser_ioctl,
2440         .throttle = mxser_throttle,
2441         .unthrottle = mxser_unthrottle,
2442         .set_termios = mxser_set_termios,
2443         .stop = mxser_stop,
2444         .start = mxser_start,
2445         .hangup = mxser_hangup,
2446         .break_ctl = mxser_rs_break,
2447         .wait_until_sent = mxser_wait_until_sent,
2448         .tiocmget = mxser_tiocmget,
2449         .tiocmset = mxser_tiocmset,
2450 };
2451
2452 /*
2453  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2454  */
2455
2456 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2457                 unsigned int irq)
2458 {
2459         if (irq)
2460                 free_irq(brd->irq, brd);
2461         if (pdev != NULL) {     /* PCI */
2462 #ifdef CONFIG_PCI
2463                 pci_release_region(pdev, 2);
2464                 pci_release_region(pdev, 3);
2465 #endif
2466         } else {
2467                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2468                 release_region(brd->vector, 1);
2469         }
2470 }
2471
2472 static int __devinit mxser_initbrd(struct mxser_board *brd,
2473                 struct pci_dev *pdev)
2474 {
2475         struct mxser_port *info;
2476         unsigned int i;
2477         int retval;
2478
2479         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2480                         brd->ports[0].max_baud);
2481
2482         for (i = 0; i < brd->info->nports; i++) {
2483                 info = &brd->ports[i];
2484                 tty_port_init(&info->port);
2485                 info->board = brd;
2486                 info->stop_rx = 0;
2487                 info->ldisc_stop_rx = 0;
2488
2489                 /* Enhance mode enabled here */
2490                 if (brd->chip_flag != MOXA_OTHER_UART)
2491                         mxser_enable_must_enchance_mode(info->ioaddr);
2492
2493                 info->port.flags = ASYNC_SHARE_IRQ;
2494                 info->type = brd->uart_type;
2495
2496                 process_txrx_fifo(info);
2497
2498                 info->custom_divisor = info->baud_base * 16;
2499                 info->port.close_delay = 5 * HZ / 10;
2500                 info->port.closing_wait = 30 * HZ;
2501                 info->normal_termios = mxvar_sdriver->init_termios;
2502                 init_waitqueue_head(&info->delta_msr_wait);
2503                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2504                 info->err_shadow = 0;
2505                 spin_lock_init(&info->slock);
2506
2507                 /* before set INT ISR, disable all int */
2508                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2509                         info->ioaddr + UART_IER);
2510         }
2511
2512         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2513                         brd);
2514         if (retval) {
2515                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2516                         "conflict with another device.\n",
2517                         brd->info->name, brd->irq);
2518                 /* We hold resources, we need to release them. */
2519                 mxser_release_res(brd, pdev, 0);
2520         }
2521         return retval;
2522 }
2523
2524 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2525 {
2526         int id, i, bits;
2527         unsigned short regs[16], irq;
2528         unsigned char scratch, scratch2;
2529
2530         brd->chip_flag = MOXA_OTHER_UART;
2531
2532         id = mxser_read_register(cap, regs);
2533         switch (id) {
2534         case C168_ASIC_ID:
2535                 brd->info = &mxser_cards[0];
2536                 break;
2537         case C104_ASIC_ID:
2538                 brd->info = &mxser_cards[1];
2539                 break;
2540         case CI104J_ASIC_ID:
2541                 brd->info = &mxser_cards[2];
2542                 break;
2543         case C102_ASIC_ID:
2544                 brd->info = &mxser_cards[5];
2545                 break;
2546         case CI132_ASIC_ID:
2547                 brd->info = &mxser_cards[6];
2548                 break;
2549         case CI134_ASIC_ID:
2550                 brd->info = &mxser_cards[7];
2551                 break;
2552         default:
2553                 return 0;
2554         }
2555
2556         irq = 0;
2557         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2558            Flag-hack checks if configuration should be read as 2-port here. */
2559         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2560                 irq = regs[9] & 0xF000;
2561                 irq = irq | (irq >> 4);
2562                 if (irq != (regs[9] & 0xFF00))
2563                         goto err_irqconflict;
2564         } else if (brd->info->nports == 4) {
2565                 irq = regs[9] & 0xF000;
2566                 irq = irq | (irq >> 4);
2567                 irq = irq | (irq >> 8);
2568                 if (irq != regs[9])
2569                         goto err_irqconflict;
2570         } else if (brd->info->nports == 8) {
2571                 irq = regs[9] & 0xF000;
2572                 irq = irq | (irq >> 4);
2573                 irq = irq | (irq >> 8);
2574                 if ((irq != regs[9]) || (irq != regs[10]))
2575                         goto err_irqconflict;
2576         }
2577
2578         if (!irq) {
2579                 printk(KERN_ERR "mxser: interrupt number unset\n");
2580                 return -EIO;
2581         }
2582         brd->irq = ((int)(irq & 0xF000) >> 12);
2583         for (i = 0; i < 8; i++)
2584                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2585         if ((regs[12] & 0x80) == 0) {
2586                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2587                 return -EIO;
2588         }
2589         brd->vector = (int)regs[11];    /* interrupt vector */
2590         if (id == 1)
2591                 brd->vector_mask = 0x00FF;
2592         else
2593                 brd->vector_mask = 0x000F;
2594         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2595                 if (regs[12] & bits) {
2596                         brd->ports[i].baud_base = 921600;
2597                         brd->ports[i].max_baud = 921600;
2598                 } else {
2599                         brd->ports[i].baud_base = 115200;
2600                         brd->ports[i].max_baud = 115200;
2601                 }
2602         }
2603         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2604         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2605         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2606         outb(scratch2, cap + UART_LCR);
2607         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2608         scratch = inb(cap + UART_IIR);
2609
2610         if (scratch & 0xC0)
2611                 brd->uart_type = PORT_16550A;
2612         else
2613                 brd->uart_type = PORT_16450;
2614         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2615                         "mxser(IO)")) {
2616                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2617                                 "0x%.8lx-0x%.8lx\n",
2618                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2619                                 8 * brd->info->nports - 1);
2620                 return -EIO;
2621         }
2622         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2623                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2624                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2625                                 "0x%.8lx-0x%.8lx\n",
2626                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2627                                 8 * brd->info->nports - 1);
2628                 return -EIO;
2629         }
2630         return brd->info->nports;
2631
2632 err_irqconflict:
2633         printk(KERN_ERR "mxser: invalid interrupt number\n");
2634         return -EIO;
2635 }
2636
2637 static int __devinit mxser_probe(struct pci_dev *pdev,
2638                 const struct pci_device_id *ent)
2639 {
2640 #ifdef CONFIG_PCI
2641         struct mxser_board *brd;
2642         unsigned int i, j;
2643         unsigned long ioaddress;
2644         int retval = -EINVAL;
2645
2646         for (i = 0; i < MXSER_BOARDS; i++)
2647                 if (mxser_boards[i].info == NULL)
2648                         break;
2649
2650         if (i >= MXSER_BOARDS) {
2651                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2652                                 "not configured\n", MXSER_BOARDS);
2653                 goto err;
2654         }
2655
2656         brd = &mxser_boards[i];
2657         brd->idx = i * MXSER_PORTS_PER_BOARD;
2658         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2659                 mxser_cards[ent->driver_data].name,
2660                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2661
2662         retval = pci_enable_device(pdev);
2663         if (retval) {
2664                 dev_err(&pdev->dev, "PCI enable failed\n");
2665                 goto err;
2666         }
2667
2668         /* io address */
2669         ioaddress = pci_resource_start(pdev, 2);
2670         retval = pci_request_region(pdev, 2, "mxser(IO)");
2671         if (retval)
2672                 goto err;
2673
2674         brd->info = &mxser_cards[ent->driver_data];
2675         for (i = 0; i < brd->info->nports; i++)
2676                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2677
2678         /* vector */
2679         ioaddress = pci_resource_start(pdev, 3);
2680         retval = pci_request_region(pdev, 3, "mxser(vector)");
2681         if (retval)
2682                 goto err_relio;
2683         brd->vector = ioaddress;
2684
2685         /* irq */
2686         brd->irq = pdev->irq;
2687
2688         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2689         brd->uart_type = PORT_16550A;
2690         brd->vector_mask = 0;
2691
2692         for (i = 0; i < brd->info->nports; i++) {
2693                 for (j = 0; j < UART_INFO_NUM; j++) {
2694                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2695                                 brd->ports[i].max_baud =
2696                                         Gpci_uart_info[j].max_baud;
2697
2698                                 /* exception....CP-102 */
2699                                 if (brd->info->flags & MXSER_HIGHBAUD)
2700                                         brd->ports[i].max_baud = 921600;
2701                                 break;
2702                         }
2703                 }
2704         }
2705
2706         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2707                 for (i = 0; i < brd->info->nports; i++) {
2708                         if (i < 4)
2709                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2710                         else
2711                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2712                 }
2713                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2714                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2715         }
2716
2717         for (i = 0; i < brd->info->nports; i++) {
2718                 brd->vector_mask |= (1 << i);
2719                 brd->ports[i].baud_base = 921600;
2720         }
2721
2722         /* mxser_initbrd will hook ISR. */
2723         retval = mxser_initbrd(brd, pdev);
2724         if (retval)
2725                 goto err_null;
2726
2727         for (i = 0; i < brd->info->nports; i++)
2728                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2729
2730         pci_set_drvdata(pdev, brd);
2731
2732         return 0;
2733 err_relio:
2734         pci_release_region(pdev, 2);
2735 err_null:
2736         brd->info = NULL;
2737 err:
2738         return retval;
2739 #else
2740         return -ENODEV;
2741 #endif
2742 }
2743
2744 static void __devexit mxser_remove(struct pci_dev *pdev)
2745 {
2746         struct mxser_board *brd = pci_get_drvdata(pdev);
2747         unsigned int i;
2748
2749         for (i = 0; i < brd->info->nports; i++)
2750                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2751
2752         mxser_release_res(brd, pdev, 1);
2753         brd->info = NULL;
2754 }
2755
2756 static struct pci_driver mxser_driver = {
2757         .name = "mxser",
2758         .id_table = mxser_pcibrds,
2759         .probe = mxser_probe,
2760         .remove = __devexit_p(mxser_remove)
2761 };
2762
2763 static int __init mxser_module_init(void)
2764 {
2765         struct mxser_board *brd;
2766         unsigned int b, i, m;
2767         int retval;
2768
2769         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2770         if (!mxvar_sdriver)
2771                 return -ENOMEM;
2772
2773         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2774                 MXSER_VERSION);
2775
2776         /* Initialize the tty_driver structure */
2777         mxvar_sdriver->owner = THIS_MODULE;
2778         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2779         mxvar_sdriver->name = "ttyMI";
2780         mxvar_sdriver->major = ttymajor;
2781         mxvar_sdriver->minor_start = 0;
2782         mxvar_sdriver->num = MXSER_PORTS + 1;
2783         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2784         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2785         mxvar_sdriver->init_termios = tty_std_termios;
2786         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2787         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2788         tty_set_operations(mxvar_sdriver, &mxser_ops);
2789
2790         retval = tty_register_driver(mxvar_sdriver);
2791         if (retval) {
2792                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2793                                 "tty driver !\n");
2794                 goto err_put;
2795         }
2796
2797         /* Start finding ISA boards here */
2798         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2799                 if (!ioaddr[b])
2800                         continue;
2801
2802                 brd = &mxser_boards[m];
2803                 retval = mxser_get_ISA_conf(!ioaddr[b], brd);
2804                 if (retval <= 0) {
2805                         brd->info = NULL;
2806                         continue;
2807                 }
2808
2809                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2810                                 brd->info->name, ioaddr[b]);
2811
2812                 /* mxser_initbrd will hook ISR. */
2813                 if (mxser_initbrd(brd, NULL) < 0) {
2814                         brd->info = NULL;
2815                         continue;
2816                 }
2817
2818                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2819                 for (i = 0; i < brd->info->nports; i++)
2820                         tty_register_device(mxvar_sdriver, brd->idx + i, NULL);
2821
2822                 m++;
2823         }
2824
2825         retval = pci_register_driver(&mxser_driver);
2826         if (retval) {
2827                 printk(KERN_ERR "mxser: can't register pci driver\n");
2828                 if (!m) {
2829                         retval = -ENODEV;
2830                         goto err_unr;
2831                 } /* else: we have some ISA cards under control */
2832         }
2833
2834         return 0;
2835 err_unr:
2836         tty_unregister_driver(mxvar_sdriver);
2837 err_put:
2838         put_tty_driver(mxvar_sdriver);
2839         return retval;
2840 }
2841
2842 static void __exit mxser_module_exit(void)
2843 {
2844         unsigned int i, j;
2845
2846         pci_unregister_driver(&mxser_driver);
2847
2848         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2849                 if (mxser_boards[i].info != NULL)
2850                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2851                                 tty_unregister_device(mxvar_sdriver,
2852                                                 mxser_boards[i].idx + j);
2853         tty_unregister_driver(mxvar_sdriver);
2854         put_tty_driver(mxvar_sdriver);
2855
2856         for (i = 0; i < MXSER_BOARDS; i++)
2857                 if (mxser_boards[i].info != NULL)
2858                         mxser_release_res(&mxser_boards[i], NULL, 1);
2859 }
2860
2861 module_init(mxser_module_init);
2862 module_exit(mxser_module_exit);