SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
  18  *      - Fixed x86_64 cleanness
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/errno.h>
  23 #include <linux/signal.h>
  24 #include <linux/sched.h>
  25 #include <linux/timer.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/tty.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/serial.h>
  30 #include <linux/serial_reg.h>
  31 #include <linux/major.h>
  32 #include <linux/string.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/ptrace.h>
  35 #include <linux/gfp.h>
  36 #include <linux/ioport.h>
  37 #include <linux/mm.h>
  38 #include <linux/delay.h>
  39 #include <linux/pci.h>
  40 #include <linux/bitops.h>
  41
  42 #include <asm/system.h>
  43 #include <asm/io.h>
  44 #include <asm/irq.h>
  45 #include <asm/uaccess.h>
  46
  47 #include "mxser.h"
  48
  49 #define MXSER_VERSION   "2.0.4"         /* 1.12 */
  50 #define MXSERMAJOR       174
  51 #define MXSERCUMAJOR     175
  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 int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 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, int, NULL, 0);
 184 module_param(ttymajor, int, 0);
 185 MODULE_LICENSE("GPL");
 186
 187 struct mxser_log {
 188         int tick;
 189         unsigned long rxcnt[MXSER_PORTS];
 190         unsigned long txcnt[MXSER_PORTS];
 191 };
 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 int mxserBoardCAP[MXSER_BOARDS] = {
 285         0, 0, 0, 0
 286         /*  0x180, 0x280, 0x200, 0x320 */
 287 };
 288
 289 static struct mxser_board mxser_boards[MXSER_BOARDS];
 290 static struct tty_driver *mxvar_sdriver;
 291 static struct mxser_log mxvar_log;
 292 static int mxser_set_baud_method[MXSER_PORTS + 1];
 293
 294 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 295 {
 296         u8 oldlcr;
 297         u8 efr;
 298
 299         oldlcr = inb(baseio + UART_LCR);
 300         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 301
 302         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 303         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 304
 305         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 306         outb(oldlcr, baseio + UART_LCR);
 307 }
 308
 309 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 310 {
 311         u8 oldlcr;
 312         u8 efr;
 313
 314         oldlcr = inb(baseio + UART_LCR);
 315         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 316
 317         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 318         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 319
 320         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 321         outb(oldlcr, baseio + UART_LCR);
 322 }
 323
 324 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 325 {
 326         u8 oldlcr;
 327         u8 efr;
 328
 329         oldlcr = inb(baseio + UART_LCR);
 330         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 331
 332         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 333         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 334         efr |= MOXA_MUST_EFR_BANK0;
 335
 336         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 337         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 338         outb(oldlcr, baseio + UART_LCR);
 339 }
 340
 341 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 342 {
 343         u8 oldlcr;
 344         u8 efr;
 345
 346         oldlcr = inb(baseio + UART_LCR);
 347         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 348
 349         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 350         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 351         efr |= MOXA_MUST_EFR_BANK0;
 352
 353         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 354         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 355         outb(oldlcr, baseio + UART_LCR);
 356 }
 357
 358 static void mxser_set_must_fifo_value(struct mxser_port *info)
 359 {
 360         u8 oldlcr;
 361         u8 efr;
 362
 363         oldlcr = inb(info->ioaddr + UART_LCR);
 364         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 365
 366         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 367         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 368         efr |= MOXA_MUST_EFR_BANK1;
 369
 370         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 371         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 372         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 373         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 374         outb(oldlcr, info->ioaddr + UART_LCR);
 375 }
 376
 377 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 378 {
 379         u8 oldlcr;
 380         u8 efr;
 381
 382         oldlcr = inb(baseio + UART_LCR);
 383         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 384
 385         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 386         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 387         efr |= MOXA_MUST_EFR_BANK2;
 388
 389         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 390         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 391         outb(oldlcr, baseio + UART_LCR);
 392 }
 393
 394 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 395 {
 396         u8 oldlcr;
 397         u8 efr;
 398
 399         oldlcr = inb(baseio + UART_LCR);
 400         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 401
 402         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 403         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 404         efr |= MOXA_MUST_EFR_BANK2;
 405
 406         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 407         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 408         outb(oldlcr, baseio + UART_LCR);
 409 }
 410
 411 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 412 {
 413         u8 oldlcr;
 414         u8 efr;
 415
 416         oldlcr = inb(baseio + UART_LCR);
 417         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 418
 419         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 420         efr &= ~MOXA_MUST_EFR_SF_MASK;
 421
 422         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 423         outb(oldlcr, baseio + UART_LCR);
 424 }
 425
 426 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 427 {
 428         u8 oldlcr;
 429         u8 efr;
 430
 431         oldlcr = inb(baseio + UART_LCR);
 432         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 433
 434         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 435         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 436         efr |= MOXA_MUST_EFR_SF_TX1;
 437
 438         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 439         outb(oldlcr, baseio + UART_LCR);
 440 }
 441
 442 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 443 {
 444         u8 oldlcr;
 445         u8 efr;
 446
 447         oldlcr = inb(baseio + UART_LCR);
 448         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 449
 450         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 451         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 452
 453         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 454         outb(oldlcr, baseio + UART_LCR);
 455 }
 456
 457 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 458 {
 459         u8 oldlcr;
 460         u8 efr;
 461
 462         oldlcr = inb(baseio + UART_LCR);
 463         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 464
 465         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 466         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 467         efr |= MOXA_MUST_EFR_SF_RX1;
 468
 469         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 470         outb(oldlcr, baseio + UART_LCR);
 471 }
 472
 473 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 474 {
 475         u8 oldlcr;
 476         u8 efr;
 477
 478         oldlcr = inb(baseio + UART_LCR);
 479         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 480
 481         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 482         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 483
 484         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 485         outb(oldlcr, baseio + UART_LCR);
 486 }
 487
 488 #ifdef CONFIG_PCI
 489 static int __devinit CheckIsMoxaMust(unsigned long io)
 490 {
 491         u8 oldmcr, hwid;
 492         int i;
 493
 494         outb(0, io + UART_LCR);
 495         mxser_disable_must_enchance_mode(io);
 496         oldmcr = inb(io + UART_MCR);
 497         outb(0, io + UART_MCR);
 498         mxser_set_must_xon1_value(io, 0x11);
 499         if ((hwid = inb(io + UART_MCR)) != 0) {
 500                 outb(oldmcr, io + UART_MCR);
 501                 return MOXA_OTHER_UART;
 502         }
 503
 504         mxser_get_must_hardware_id(io, &hwid);
 505         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 506                 if (hwid == Gpci_uart_info[i].type)
 507                         return (int)hwid;
 508         }
 509         return MOXA_OTHER_UART;
 510 }
 511 #endif
 512
 513 static void process_txrx_fifo(struct mxser_port *info)
 514 {
 515         int i;
 516
 517         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 518                 info->rx_trigger = 1;
 519                 info->rx_high_water = 1;
 520                 info->rx_low_water = 1;
 521                 info->xmit_fifo_size = 1;
 522         } else
 523                 for (i = 0; i < UART_INFO_NUM; i++)
 524                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 525                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 526                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 527                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 528                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 529                                 break;
 530                         }
 531 }
 532
 533 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 534 {
 535         static unsigned char mxser_msr[MXSER_PORTS + 1];
 536         unsigned char status = 0;
 537
 538         status = inb(baseaddr + UART_MSR);
 539
 540         mxser_msr[port] &= 0x0F;
 541         mxser_msr[port] |= status;
 542         status = mxser_msr[port];
 543         if (mode)
 544                 mxser_msr[port] = 0;
 545
 546         return status;
 547 }
 548
 549 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 550                 struct mxser_port *port)
 551 {
 552         DECLARE_WAITQUEUE(wait, current);
 553         int retval;
 554         int do_clocal = 0;
 555         unsigned long flags;
 556
 557         /*
 558          * If non-blocking mode is set, or the port is not enabled,
 559          * then make the check up front and then exit.
 560          */
 561         if ((filp->f_flags & O_NONBLOCK) ||
 562                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 563                 port->port.flags |= ASYNC_NORMAL_ACTIVE;
 564                 return 0;
 565         }
 566
 567         if (tty->termios->c_cflag & CLOCAL)
 568                 do_clocal = 1;
 569
 570         /*
 571          * Block waiting for the carrier detect and the line to become
 572          * free (i.e., not in use by the callout).  While we are in
 573          * this loop, port->port.count is dropped by one, so that
 574          * mxser_close() knows when to free things.  We restore it upon
 575          * exit, either normal or abnormal.
 576          */
 577         retval = 0;
 578         add_wait_queue(&port->port.open_wait, &wait);
 579
 580         spin_lock_irqsave(&port->slock, flags);
 581         if (!tty_hung_up_p(filp))
 582                 port->port.count--;
 583         spin_unlock_irqrestore(&port->slock, flags);
 584         port->port.blocked_open++;
 585         while (1) {
 586                 spin_lock_irqsave(&port->slock, flags);
 587                 outb(inb(port->ioaddr + UART_MCR) |
 588                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 589                 spin_unlock_irqrestore(&port->slock, flags);
 590                 set_current_state(TASK_INTERRUPTIBLE);
 591                 if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
 592                         if (port->port.flags & ASYNC_HUP_NOTIFY)
 593                                 retval = -EAGAIN;
 594                         else
 595                                 retval = -ERESTARTSYS;
 596                         break;
 597                 }
 598                 if (!(port->port.flags & ASYNC_CLOSING) &&
 599                                 (do_clocal ||
 600                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 601                         break;
 602                 if (signal_pending(current)) {
 603                         retval = -ERESTARTSYS;
 604                         break;
 605                 }
 606                 schedule();
 607         }
 608         set_current_state(TASK_RUNNING);
 609         remove_wait_queue(&port->port.open_wait, &wait);
 610         if (!tty_hung_up_p(filp))
 611                 port->port.count++;
 612         port->port.blocked_open--;
 613         if (retval)
 614                 return retval;
 615         port->port.flags |= ASYNC_NORMAL_ACTIVE;
 616         return 0;
 617 }
 618
 619 static int mxser_set_baud(struct mxser_port *info, long newspd)
 620 {
 621         int quot = 0, baud;
 622         unsigned char cval;
 623
 624         if (!info->port.tty || !info->port.tty->termios)
 625                 return -1;
 626
 627         if (!(info->ioaddr))
 628                 return -1;
 629
 630         if (newspd > info->max_baud)
 631                 return -1;
 632
 633         if (newspd == 134) {
 634                 quot = 2 * info->baud_base / 269;
 635                 tty_encode_baud_rate(info->port.tty, 134, 134);
 636         } else if (newspd) {
 637                 quot = info->baud_base / newspd;
 638                 if (quot == 0)
 639                         quot = 1;
 640                 baud = info->baud_base/quot;
 641                 tty_encode_baud_rate(info->port.tty, baud, baud);
 642         } else {
 643                 quot = 0;
 644         }
 645
 646         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 647         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 648
 649         if (quot) {
 650                 info->MCR |= UART_MCR_DTR;
 651                 outb(info->MCR, info->ioaddr + UART_MCR);
 652         } else {
 653                 info->MCR &= ~UART_MCR_DTR;
 654                 outb(info->MCR, info->ioaddr + UART_MCR);
 655                 return 0;
 656         }
 657
 658         cval = inb(info->ioaddr + UART_LCR);
 659
 660         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 661
 662         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 663         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 664         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 665
 666 #ifdef BOTHER
 667         if (C_BAUD(info->port.tty) == BOTHER) {
 668                 quot = info->baud_base % newspd;
 669                 quot *= 8;
 670                 if (quot % newspd > newspd / 2) {
 671                         quot /= newspd;
 672                         quot++;
 673                 } else
 674                         quot /= newspd;
 675
 676                 mxser_set_must_enum_value(info->ioaddr, quot);
 677         } else
 678 #endif
 679                 mxser_set_must_enum_value(info->ioaddr, 0);
 680
 681         return 0;
 682 }
 683
 684 /*
 685  * This routine is called to set the UART divisor registers to match
 686  * the specified baud rate for a serial port.
 687  */
 688 static int mxser_change_speed(struct mxser_port *info,
 689                 struct ktermios *old_termios)
 690 {
 691         unsigned cflag, cval, fcr;
 692         int ret = 0;
 693         unsigned char status;
 694
 695         if (!info->port.tty || !info->port.tty->termios)
 696                 return ret;
 697         cflag = info->port.tty->termios->c_cflag;
 698         if (!(info->ioaddr))
 699                 return ret;
 700
 701         if (mxser_set_baud_method[info->port.tty->index] == 0)
 702                 mxser_set_baud(info, tty_get_baud_rate(info->port.tty));
 703
 704         /* byte size and parity */
 705         switch (cflag & CSIZE) {
 706         case CS5:
 707                 cval = 0x00;
 708                 break;
 709         case CS6:
 710                 cval = 0x01;
 711                 break;
 712         case CS7:
 713                 cval = 0x02;
 714                 break;
 715         case CS8:
 716                 cval = 0x03;
 717                 break;
 718         default:
 719                 cval = 0x00;
 720                 break;          /* too keep GCC shut... */
 721         }
 722         if (cflag & CSTOPB)
 723                 cval |= 0x04;
 724         if (cflag & PARENB)
 725                 cval |= UART_LCR_PARITY;
 726         if (!(cflag & PARODD))
 727                 cval |= UART_LCR_EPAR;
 728         if (cflag & CMSPAR)
 729                 cval |= UART_LCR_SPAR;
 730
 731         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 732                 if (info->board->chip_flag) {
 733                         fcr = UART_FCR_ENABLE_FIFO;
 734                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 735                         mxser_set_must_fifo_value(info);
 736                 } else
 737                         fcr = 0;
 738         } else {
 739                 fcr = UART_FCR_ENABLE_FIFO;
 740                 if (info->board->chip_flag) {
 741                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 742                         mxser_set_must_fifo_value(info);
 743                 } else {
 744                         switch (info->rx_trigger) {
 745                         case 1:
 746                                 fcr |= UART_FCR_TRIGGER_1;
 747                                 break;
 748                         case 4:
 749                                 fcr |= UART_FCR_TRIGGER_4;
 750                                 break;
 751                         case 8:
 752                                 fcr |= UART_FCR_TRIGGER_8;
 753                                 break;
 754                         default:
 755                                 fcr |= UART_FCR_TRIGGER_14;
 756                                 break;
 757                         }
 758                 }
 759         }
 760
 761         /* CTS flow control flag and modem status interrupts */
 762         info->IER &= ~UART_IER_MSI;
 763         info->MCR &= ~UART_MCR_AFE;
 764         if (cflag & CRTSCTS) {
 765                 info->port.flags |= ASYNC_CTS_FLOW;
 766                 info->IER |= UART_IER_MSI;
 767                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 768                         info->MCR |= UART_MCR_AFE;
 769                 } else {
 770                         status = inb(info->ioaddr + UART_MSR);
 771                         if (info->port.tty->hw_stopped) {
 772                                 if (status & UART_MSR_CTS) {
 773                                         info->port.tty->hw_stopped = 0;
 774                                         if (info->type != PORT_16550A &&
 775                                                         !info->board->chip_flag) {
 776                                                 outb(info->IER & ~UART_IER_THRI,
 777                                                         info->ioaddr +
 778                                                         UART_IER);
 779                                                 info->IER |= UART_IER_THRI;
 780                                                 outb(info->IER, info->ioaddr +
 781                                                                 UART_IER);
 782                                         }
 783                                         tty_wakeup(info->port.tty);
 784                                 }
 785                         } else {
 786                                 if (!(status & UART_MSR_CTS)) {
 787                                         info->port.tty->hw_stopped = 1;
 788                                         if ((info->type != PORT_16550A) &&
 789                                                         (!info->board->chip_flag)) {
 790                                                 info->IER &= ~UART_IER_THRI;
 791                                                 outb(info->IER, info->ioaddr +
 792                                                                 UART_IER);
 793                                         }
 794                                 }
 795                         }
 796                 }
 797         } else {
 798                 info->port.flags &= ~ASYNC_CTS_FLOW;
 799         }
 800         outb(info->MCR, info->ioaddr + UART_MCR);
 801         if (cflag & CLOCAL) {
 802                 info->port.flags &= ~ASYNC_CHECK_CD;
 803         } else {
 804                 info->port.flags |= ASYNC_CHECK_CD;
 805                 info->IER |= UART_IER_MSI;
 806         }
 807         outb(info->IER, info->ioaddr + UART_IER);
 808
 809         /*
 810          * Set up parity check flag
 811          */
 812         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 813         if (I_INPCK(info->port.tty))
 814                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 815         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
 816                 info->read_status_mask |= UART_LSR_BI;
 817
 818         info->ignore_status_mask = 0;
 819
 820         if (I_IGNBRK(info->port.tty)) {
 821                 info->ignore_status_mask |= UART_LSR_BI;
 822                 info->read_status_mask |= UART_LSR_BI;
 823                 /*
 824                  * If we're ignore parity and break indicators, ignore
 825                  * overruns too.  (For real raw support).
 826                  */
 827                 if (I_IGNPAR(info->port.tty)) {
 828                         info->ignore_status_mask |=
 829                                                 UART_LSR_OE |
 830                                                 UART_LSR_PE |
 831                                                 UART_LSR_FE;
 832                         info->read_status_mask |=
 833                                                 UART_LSR_OE |
 834                                                 UART_LSR_PE |
 835                                                 UART_LSR_FE;
 836                 }
 837         }
 838         if (info->board->chip_flag) {
 839                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(info->port.tty));
 840                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(info->port.tty));
 841                 if (I_IXON(info->port.tty)) {
 842                         mxser_enable_must_rx_software_flow_control(
 843                                         info->ioaddr);
 844                 } else {
 845                         mxser_disable_must_rx_software_flow_control(
 846                                         info->ioaddr);
 847                 }
 848                 if (I_IXOFF(info->port.tty)) {
 849                         mxser_enable_must_tx_software_flow_control(
 850                                         info->ioaddr);
 851                 } else {
 852                         mxser_disable_must_tx_software_flow_control(
 853                                         info->ioaddr);
 854                 }
 855         }
 856
 857
 858         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 859         outb(cval, info->ioaddr + UART_LCR);
 860
 861         return ret;
 862 }
 863
 864 static void mxser_check_modem_status(struct mxser_port *port, int status)
 865 {
 866         /* update input line counters */
 867         if (status & UART_MSR_TERI)
 868                 port->icount.rng++;
 869         if (status & UART_MSR_DDSR)
 870                 port->icount.dsr++;
 871         if (status & UART_MSR_DDCD)
 872                 port->icount.dcd++;
 873         if (status & UART_MSR_DCTS)
 874                 port->icount.cts++;
 875         port->mon_data.modem_status = status;
 876         wake_up_interruptible(&port->delta_msr_wait);
 877
 878         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 879                 if (status & UART_MSR_DCD)
 880                         wake_up_interruptible(&port->port.open_wait);
 881         }
 882
 883         if (port->port.flags & ASYNC_CTS_FLOW) {
 884                 if (port->port.tty->hw_stopped) {
 885                         if (status & UART_MSR_CTS) {
 886                                 port->port.tty->hw_stopped = 0;
 887
 888                                 if ((port->type != PORT_16550A) &&
 889                                                 (!port->board->chip_flag)) {
 890                                         outb(port->IER & ~UART_IER_THRI,
 891                                                 port->ioaddr + UART_IER);
 892                                         port->IER |= UART_IER_THRI;
 893                                         outb(port->IER, port->ioaddr +
 894                                                         UART_IER);
 895                                 }
 896                                 tty_wakeup(port->port.tty);
 897                         }
 898                 } else {
 899                         if (!(status & UART_MSR_CTS)) {
 900                                 port->port.tty->hw_stopped = 1;
 901                                 if (port->type != PORT_16550A &&
 902                                                 !port->board->chip_flag) {
 903                                         port->IER &= ~UART_IER_THRI;
 904                                         outb(port->IER, port->ioaddr +
 905                                                         UART_IER);
 906                                 }
 907                         }
 908                 }
 909         }
 910 }
 911
 912 static int mxser_startup(struct mxser_port *info)
 913 {
 914         unsigned long page;
 915         unsigned long flags;
 916
 917         page = __get_free_page(GFP_KERNEL);
 918         if (!page)
 919                 return -ENOMEM;
 920
 921         spin_lock_irqsave(&info->slock, flags);
 922
 923         if (info->port.flags & ASYNC_INITIALIZED) {
 924                 free_page(page);
 925                 spin_unlock_irqrestore(&info->slock, flags);
 926                 return 0;
 927         }
 928
 929         if (!info->ioaddr || !info->type) {
 930                 if (info->port.tty)
 931                         set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 932                 free_page(page);
 933                 spin_unlock_irqrestore(&info->slock, flags);
 934                 return 0;
 935         }
 936         if (info->port.xmit_buf)
 937                 free_page(page);
 938         else
 939                 info->port.xmit_buf = (unsigned char *) page;
 940
 941         /*
 942          * Clear the FIFO buffers and disable them
 943          * (they will be reenabled in mxser_change_speed())
 944          */
 945         if (info->board->chip_flag)
 946                 outb((UART_FCR_CLEAR_RCVR |
 947                         UART_FCR_CLEAR_XMIT |
 948                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 949         else
 950                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 951                         info->ioaddr + UART_FCR);
 952
 953         /*
 954          * At this point there's no way the LSR could still be 0xFF;
 955          * if it is, then bail out, because there's likely no UART
 956          * here.
 957          */
 958         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 959                 spin_unlock_irqrestore(&info->slock, flags);
 960                 if (capable(CAP_SYS_ADMIN)) {
 961                         if (info->port.tty)
 962                                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 963                         return 0;
 964                 } else
 965                         return -ENODEV;
 966         }
 967
 968         /*
 969          * Clear the interrupt registers.
 970          */
 971         (void) inb(info->ioaddr + UART_LSR);
 972         (void) inb(info->ioaddr + UART_RX);
 973         (void) inb(info->ioaddr + UART_IIR);
 974         (void) inb(info->ioaddr + UART_MSR);
 975
 976         /*
 977          * Now, initialize the UART
 978          */
 979         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 980         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 981         outb(info->MCR, info->ioaddr + UART_MCR);
 982
 983         /*
 984          * Finally, enable interrupts
 985          */
 986         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 987
 988         if (info->board->chip_flag)
 989                 info->IER |= MOXA_MUST_IER_EGDAI;
 990         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 991
 992         /*
 993          * And clear the interrupt registers again for luck.
 994          */
 995         (void) inb(info->ioaddr + UART_LSR);
 996         (void) inb(info->ioaddr + UART_RX);
 997         (void) inb(info->ioaddr + UART_IIR);
 998         (void) inb(info->ioaddr + UART_MSR);
 999
1000         if (info->port.tty)
1001                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1002         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1003
1004         /*
1005          * and set the speed of the serial port
1006          */
1007         mxser_change_speed(info, NULL);
1008         info->port.flags |= ASYNC_INITIALIZED;
1009         spin_unlock_irqrestore(&info->slock, flags);
1010
1011         return 0;
1012 }
1013
1014 /*
1015  * This routine will shutdown a serial port; interrupts maybe disabled, and
1016  * DTR is dropped if the hangup on close termio flag is on.
1017  */
1018 static void mxser_shutdown(struct mxser_port *info)
1019 {
1020         unsigned long flags;
1021
1022         if (!(info->port.flags & ASYNC_INITIALIZED))
1023                 return;
1024
1025         spin_lock_irqsave(&info->slock, flags);
1026
1027         /*
1028          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1029          * here so the queue might never be waken up
1030          */
1031         wake_up_interruptible(&info->delta_msr_wait);
1032
1033         /*
1034          * Free the IRQ, if necessary
1035          */
1036         if (info->port.xmit_buf) {
1037                 free_page((unsigned long) info->port.xmit_buf);
1038                 info->port.xmit_buf = NULL;
1039         }
1040
1041         info->IER = 0;
1042         outb(0x00, info->ioaddr + UART_IER);
1043
1044         if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
1045                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1046         outb(info->MCR, info->ioaddr + UART_MCR);
1047
1048         /* clear Rx/Tx FIFO's */
1049         if (info->board->chip_flag)
1050                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1051                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1052                                 info->ioaddr + UART_FCR);
1053         else
1054                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1055                         info->ioaddr + UART_FCR);
1056
1057         /* read data port to reset things */
1058         (void) inb(info->ioaddr + UART_RX);
1059
1060         if (info->port.tty)
1061                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1062
1063         info->port.flags &= ~ASYNC_INITIALIZED;
1064
1065         if (info->board->chip_flag)
1066                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1067
1068         spin_unlock_irqrestore(&info->slock, flags);
1069 }
1070
1071 /*
1072  * This routine is called whenever a serial port is opened.  It
1073  * enables interrupts for a serial port, linking in its async structure into
1074  * the IRQ chain.   It also performs the serial-specific
1075  * initialization for the tty structure.
1076  */
1077 static int mxser_open(struct tty_struct *tty, struct file *filp)
1078 {
1079         struct mxser_port *info;
1080         unsigned long flags;
1081         int retval, line;
1082
1083         line = tty->index;
1084         if (line == MXSER_PORTS)
1085                 return 0;
1086         if (line < 0 || line > MXSER_PORTS)
1087                 return -ENODEV;
1088         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1089         if (!info->ioaddr)
1090                 return -ENODEV;
1091
1092         tty->driver_data = info;
1093         info->port.tty = tty;
1094         /*
1095          * Start up serial port
1096          */
1097         spin_lock_irqsave(&info->slock, flags);
1098         info->port.count++;
1099         spin_unlock_irqrestore(&info->slock, flags);
1100         retval = mxser_startup(info);
1101         if (retval)
1102                 return retval;
1103
1104         retval = mxser_block_til_ready(tty, filp, info);
1105         if (retval)
1106                 return retval;
1107
1108         /* unmark here for very high baud rate (ex. 921600 bps) used */
1109         tty->low_latency = 1;
1110         return 0;
1111 }
1112
1113 static void mxser_flush_buffer(struct tty_struct *tty)
1114 {
1115         struct mxser_port *info = tty->driver_data;
1116         char fcr;
1117         unsigned long flags;
1118
1119
1120         spin_lock_irqsave(&info->slock, flags);
1121         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1122
1123         fcr = inb(info->ioaddr + UART_FCR);
1124         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1125                 info->ioaddr + UART_FCR);
1126         outb(fcr, info->ioaddr + UART_FCR);
1127
1128         spin_unlock_irqrestore(&info->slock, flags);
1129
1130         tty_wakeup(tty);
1131 }
1132
1133
1134 /*
1135  * This routine is called when the serial port gets closed.  First, we
1136  * wait for the last remaining data to be sent.  Then, we unlink its
1137  * async structure from the interrupt chain if necessary, and we free
1138  * that IRQ if nothing is left in the chain.
1139  */
1140 static void mxser_close(struct tty_struct *tty, struct file *filp)
1141 {
1142         struct mxser_port *info = tty->driver_data;
1143
1144         unsigned long timeout;
1145         unsigned long flags;
1146
1147         if (tty->index == MXSER_PORTS)
1148                 return;
1149         if (!info)
1150                 return;
1151
1152         spin_lock_irqsave(&info->slock, flags);
1153
1154         if (tty_hung_up_p(filp)) {
1155                 spin_unlock_irqrestore(&info->slock, flags);
1156                 return;
1157         }
1158         if ((tty->count == 1) && (info->port.count != 1)) {
1159                 /*
1160                  * Uh, oh.  tty->count is 1, which means that the tty
1161                  * structure will be freed.  Info->port.count should always
1162                  * be one in these conditions.  If it's greater than
1163                  * one, we've got real problems, since it means the
1164                  * serial port won't be shutdown.
1165                  */
1166                 printk(KERN_ERR "mxser_close: bad serial port count; "
1167                         "tty->count is 1, info->port.count is %d\n", info->port.count);
1168                 info->port.count = 1;
1169         }
1170         if (--info->port.count < 0) {
1171                 printk(KERN_ERR "mxser_close: bad serial port count for "
1172                         "ttys%d: %d\n", tty->index, info->port.count);
1173                 info->port.count = 0;
1174         }
1175         if (info->port.count) {
1176                 spin_unlock_irqrestore(&info->slock, flags);
1177                 return;
1178         }
1179         info->port.flags |= ASYNC_CLOSING;
1180         spin_unlock_irqrestore(&info->slock, flags);
1181         /*
1182          * Save the termios structure, since this port may have
1183          * separate termios for callout and dialin.
1184          */
1185         if (info->port.flags & ASYNC_NORMAL_ACTIVE)
1186                 info->normal_termios = *tty->termios;
1187         /*
1188          * Now we wait for the transmit buffer to clear; and we notify
1189          * the line discipline to only process XON/XOFF characters.
1190          */
1191         tty->closing = 1;
1192         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1193                 tty_wait_until_sent(tty, info->port.closing_wait);
1194         /*
1195          * At this point we stop accepting input.  To do this, we
1196          * disable the receive line status interrupts, and tell the
1197          * interrupt driver to stop checking the data ready bit in the
1198          * line status register.
1199          */
1200         info->IER &= ~UART_IER_RLSI;
1201         if (info->board->chip_flag)
1202                 info->IER &= ~MOXA_MUST_RECV_ISR;
1203
1204         if (info->port.flags & ASYNC_INITIALIZED) {
1205                 outb(info->IER, info->ioaddr + UART_IER);
1206                 /*
1207                  * Before we drop DTR, make sure the UART transmitter
1208                  * has completely drained; this is especially
1209                  * important if there is a transmit FIFO!
1210                  */
1211                 timeout = jiffies + HZ;
1212                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1213                         schedule_timeout_interruptible(5);
1214                         if (time_after(jiffies, timeout))
1215                                 break;
1216                 }
1217         }
1218         mxser_shutdown(info);
1219
1220         mxser_flush_buffer(tty);
1221         tty_ldisc_flush(tty);
1222
1223         tty->closing = 0;
1224         info->port.tty = NULL;
1225         if (info->port.blocked_open) {
1226                 if (info->port.close_delay)
1227                         schedule_timeout_interruptible(info->port.close_delay);
1228                 wake_up_interruptible(&info->port.open_wait);
1229         }
1230
1231         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1232 }
1233
1234 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1235 {
1236         int c, total = 0;
1237         struct mxser_port *info = tty->driver_data;
1238         unsigned long flags;
1239
1240         if (!info->port.xmit_buf)
1241                 return 0;
1242
1243         while (1) {
1244                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1245                                           SERIAL_XMIT_SIZE - info->xmit_head));
1246                 if (c <= 0)
1247                         break;
1248
1249                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1250                 spin_lock_irqsave(&info->slock, flags);
1251                 info->xmit_head = (info->xmit_head + c) &
1252                                   (SERIAL_XMIT_SIZE - 1);
1253                 info->xmit_cnt += c;
1254                 spin_unlock_irqrestore(&info->slock, flags);
1255
1256                 buf += c;
1257                 count -= c;
1258                 total += c;
1259         }
1260
1261         if (info->xmit_cnt && !tty->stopped) {
1262                 if (!tty->hw_stopped ||
1263                                 (info->type == PORT_16550A) ||
1264                                 (info->board->chip_flag)) {
1265                         spin_lock_irqsave(&info->slock, flags);
1266                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1267                                         UART_IER);
1268                         info->IER |= UART_IER_THRI;
1269                         outb(info->IER, info->ioaddr + UART_IER);
1270                         spin_unlock_irqrestore(&info->slock, flags);
1271                 }
1272         }
1273         return total;
1274 }
1275
1276 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1277 {
1278         struct mxser_port *info = tty->driver_data;
1279         unsigned long flags;
1280
1281         if (!info->port.xmit_buf)
1282                 return 0;
1283
1284         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1285                 return 0;
1286
1287         spin_lock_irqsave(&info->slock, flags);
1288         info->port.xmit_buf[info->xmit_head++] = ch;
1289         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1290         info->xmit_cnt++;
1291         spin_unlock_irqrestore(&info->slock, flags);
1292         if (!tty->stopped) {
1293                 if (!tty->hw_stopped ||
1294                                 (info->type == PORT_16550A) ||
1295                                 info->board->chip_flag) {
1296                         spin_lock_irqsave(&info->slock, flags);
1297                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1298                         info->IER |= UART_IER_THRI;
1299                         outb(info->IER, info->ioaddr + UART_IER);
1300                         spin_unlock_irqrestore(&info->slock, flags);
1301                 }
1302         }
1303         return 1;
1304 }
1305
1306
1307 static void mxser_flush_chars(struct tty_struct *tty)
1308 {
1309         struct mxser_port *info = tty->driver_data;
1310         unsigned long flags;
1311
1312         if (info->xmit_cnt <= 0 ||
1313                         tty->stopped ||
1314                         !info->port.xmit_buf ||
1315                         (tty->hw_stopped &&
1316                          (info->type != PORT_16550A) &&
1317                          (!info->board->chip_flag)
1318                         ))
1319                 return;
1320
1321         spin_lock_irqsave(&info->slock, flags);
1322
1323         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1324         info->IER |= UART_IER_THRI;
1325         outb(info->IER, info->ioaddr + UART_IER);
1326
1327         spin_unlock_irqrestore(&info->slock, flags);
1328 }
1329
1330 static int mxser_write_room(struct tty_struct *tty)
1331 {
1332         struct mxser_port *info = tty->driver_data;
1333         int ret;
1334
1335         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1336         if (ret < 0)
1337                 ret = 0;
1338         return ret;
1339 }
1340
1341 static int mxser_chars_in_buffer(struct tty_struct *tty)
1342 {
1343         struct mxser_port *info = tty->driver_data;
1344         return info->xmit_cnt;
1345 }
1346
1347 /*
1348  * ------------------------------------------------------------
1349  * friends of mxser_ioctl()
1350  * ------------------------------------------------------------
1351  */
1352 static int mxser_get_serial_info(struct mxser_port *info,
1353                 struct serial_struct __user *retinfo)
1354 {
1355         struct serial_struct tmp = {
1356                 .type = info->type,
1357                 .line = info->port.tty->index,
1358                 .port = info->ioaddr,
1359                 .irq = info->board->irq,
1360                 .flags = info->port.flags,
1361                 .baud_base = info->baud_base,
1362                 .close_delay = info->port.close_delay,
1363                 .closing_wait = info->port.closing_wait,
1364                 .custom_divisor = info->custom_divisor,
1365                 .hub6 = 0
1366         };
1367         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1368                 return -EFAULT;
1369         return 0;
1370 }
1371
1372 static int mxser_set_serial_info(struct mxser_port *info,
1373                 struct serial_struct __user *new_info)
1374 {
1375         struct serial_struct new_serial;
1376         speed_t baud;
1377         unsigned long sl_flags;
1378         unsigned int flags;
1379         int retval = 0;
1380
1381         if (!new_info || !info->ioaddr)
1382                 return -ENODEV;
1383         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1384                 return -EFAULT;
1385
1386         if (new_serial.irq != info->board->irq ||
1387                         new_serial.port != info->ioaddr)
1388                 return -EINVAL;
1389
1390         flags = info->port.flags & ASYNC_SPD_MASK;
1391
1392         if (!capable(CAP_SYS_ADMIN)) {
1393                 if ((new_serial.baud_base != info->baud_base) ||
1394                                 (new_serial.close_delay != info->port.close_delay) ||
1395                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1396                         return -EPERM;
1397                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1398                                 (new_serial.flags & ASYNC_USR_MASK));
1399         } else {
1400                 /*
1401                  * OK, past this point, all the error checking has been done.
1402                  * At this point, we start making changes.....
1403                  */
1404                 info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
1405                                 (new_serial.flags & ASYNC_FLAGS));
1406                 info->port.close_delay = new_serial.close_delay * HZ / 100;
1407                 info->port.closing_wait = new_serial.closing_wait * HZ / 100;
1408                 info->port.tty->low_latency =
1409                                 (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1410                 if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1411                                 (new_serial.baud_base != info->baud_base ||
1412                                 new_serial.custom_divisor !=
1413                                 info->custom_divisor)) {
1414                         baud = new_serial.baud_base / new_serial.custom_divisor;
1415                         tty_encode_baud_rate(info->port.tty, baud, baud);
1416                 }
1417         }
1418
1419         info->type = new_serial.type;
1420
1421         process_txrx_fifo(info);
1422
1423         if (info->port.flags & ASYNC_INITIALIZED) {
1424                 if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
1425                         spin_lock_irqsave(&info->slock, sl_flags);
1426                         mxser_change_speed(info, NULL);
1427                         spin_unlock_irqrestore(&info->slock, sl_flags);
1428                 }
1429         } else
1430                 retval = mxser_startup(info);
1431
1432         return retval;
1433 }
1434
1435 /*
1436  * mxser_get_lsr_info - get line status register info
1437  *
1438  * Purpose: Let user call ioctl() to get info when the UART physically
1439  *          is emptied.  On bus types like RS485, the transmitter must
1440  *          release the bus after transmitting. This must be done when
1441  *          the transmit shift register is empty, not be done when the
1442  *          transmit holding register is empty.  This functionality
1443  *          allows an RS485 driver to be written in user space.
1444  */
1445 static int mxser_get_lsr_info(struct mxser_port *info,
1446                 unsigned int __user *value)
1447 {
1448         unsigned char status;
1449         unsigned int result;
1450         unsigned long flags;
1451
1452         spin_lock_irqsave(&info->slock, flags);
1453         status = inb(info->ioaddr + UART_LSR);
1454         spin_unlock_irqrestore(&info->slock, flags);
1455         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1456         return put_user(result, value);
1457 }
1458
1459 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1460 {
1461         struct mxser_port *info = tty->driver_data;
1462         unsigned char control, status;
1463         unsigned long flags;
1464
1465
1466         if (tty->index == MXSER_PORTS)
1467                 return -ENOIOCTLCMD;
1468         if (test_bit(TTY_IO_ERROR, &tty->flags))
1469                 return -EIO;
1470
1471         control = info->MCR;
1472
1473         spin_lock_irqsave(&info->slock, flags);
1474         status = inb(info->ioaddr + UART_MSR);
1475         if (status & UART_MSR_ANY_DELTA)
1476                 mxser_check_modem_status(info, status);
1477         spin_unlock_irqrestore(&info->slock, flags);
1478         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1479                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1480                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1481                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1482                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1483                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1484 }
1485
1486 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1487                 unsigned int set, unsigned int clear)
1488 {
1489         struct mxser_port *info = tty->driver_data;
1490         unsigned long flags;
1491
1492
1493         if (tty->index == MXSER_PORTS)
1494                 return -ENOIOCTLCMD;
1495         if (test_bit(TTY_IO_ERROR, &tty->flags))
1496                 return -EIO;
1497
1498         spin_lock_irqsave(&info->slock, flags);
1499
1500         if (set & TIOCM_RTS)
1501                 info->MCR |= UART_MCR_RTS;
1502         if (set & TIOCM_DTR)
1503                 info->MCR |= UART_MCR_DTR;
1504
1505         if (clear & TIOCM_RTS)
1506                 info->MCR &= ~UART_MCR_RTS;
1507         if (clear & TIOCM_DTR)
1508                 info->MCR &= ~UART_MCR_DTR;
1509
1510         outb(info->MCR, info->ioaddr + UART_MCR);
1511         spin_unlock_irqrestore(&info->slock, flags);
1512         return 0;
1513 }
1514
1515 static int __init mxser_program_mode(int port)
1516 {
1517         int id, i, j, n;
1518
1519         outb(0, port);
1520         outb(0, port);
1521         outb(0, port);
1522         (void)inb(port);
1523         (void)inb(port);
1524         outb(0, port);
1525         (void)inb(port);
1526
1527         id = inb(port + 1) & 0x1F;
1528         if ((id != C168_ASIC_ID) &&
1529                         (id != C104_ASIC_ID) &&
1530                         (id != C102_ASIC_ID) &&
1531                         (id != CI132_ASIC_ID) &&
1532                         (id != CI134_ASIC_ID) &&
1533                         (id != CI104J_ASIC_ID))
1534                 return -1;
1535         for (i = 0, j = 0; i < 4; i++) {
1536                 n = inb(port + 2);
1537                 if (n == 'M') {
1538                         j = 1;
1539                 } else if ((j == 1) && (n == 1)) {
1540                         j = 2;
1541                         break;
1542                 } else
1543                         j = 0;
1544         }
1545         if (j != 2)
1546                 id = -2;
1547         return id;
1548 }
1549
1550 static void __init mxser_normal_mode(int port)
1551 {
1552         int i, n;
1553
1554         outb(0xA5, port + 1);
1555         outb(0x80, port + 3);
1556         outb(12, port + 0);     /* 9600 bps */
1557         outb(0, port + 1);
1558         outb(0x03, port + 3);   /* 8 data bits */
1559         outb(0x13, port + 4);   /* loop back mode */
1560         for (i = 0; i < 16; i++) {
1561                 n = inb(port + 5);
1562                 if ((n & 0x61) == 0x60)
1563                         break;
1564                 if ((n & 1) == 1)
1565                         (void)inb(port);
1566         }
1567         outb(0x00, port + 4);
1568 }
1569
1570 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1571 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1572 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1573 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1574 #define EN_CCMD         0x000   /* Chip's command register     */
1575 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1576 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1577 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1578 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1579 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1580 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1581 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1582 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1583 static int __init mxser_read_register(int port, unsigned short *regs)
1584 {
1585         int i, k, value, id;
1586         unsigned int j;
1587
1588         id = mxser_program_mode(port);
1589         if (id < 0)
1590                 return id;
1591         for (i = 0; i < 14; i++) {
1592                 k = (i & 0x3F) | 0x180;
1593                 for (j = 0x100; j > 0; j >>= 1) {
1594                         outb(CHIP_CS, port);
1595                         if (k & j) {
1596                                 outb(CHIP_CS | CHIP_DO, port);
1597                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1598                         } else {
1599                                 outb(CHIP_CS, port);
1600                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1601                         }
1602                 }
1603                 (void)inb(port);
1604                 value = 0;
1605                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1606                         outb(CHIP_CS, port);
1607                         outb(CHIP_CS | CHIP_SK, port);
1608                         if (inb(port) & CHIP_DI)
1609                                 value |= j;
1610                 }
1611                 regs[i] = value;
1612                 outb(0, port);
1613         }
1614         mxser_normal_mode(port);
1615         return id;
1616 }
1617
1618 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1619 {
1620         struct mxser_port *port;
1621         int result, status;
1622         unsigned int i, j;
1623         int ret = 0;
1624
1625         switch (cmd) {
1626         case MOXA_GET_MAJOR:
1627                 printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl %x, fix "
1628                                 "your userspace\n", current->comm, cmd);
1629                 return put_user(ttymajor, (int __user *)argp);
1630
1631         case MOXA_CHKPORTENABLE:
1632                 result = 0;
1633                 lock_kernel();
1634                 for (i = 0; i < MXSER_BOARDS; i++)
1635                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1636                                 if (mxser_boards[i].ports[j].ioaddr)
1637                                         result |= (1 << i);
1638                 unlock_kernel();
1639                 return put_user(result, (unsigned long __user *)argp);
1640         case MOXA_GETDATACOUNT:
1641                 lock_kernel();
1642                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1643                         ret = -EFAULT;
1644                 unlock_kernel();
1645                 return ret;
1646         case MOXA_GETMSTATUS: {
1647                 struct mxser_mstatus ms, __user *msu = argp;
1648                 lock_kernel();
1649                 for (i = 0; i < MXSER_BOARDS; i++)
1650                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1651                                 port = &mxser_boards[i].ports[j];
1652                                 memset(&ms, 0, sizeof(ms));
1653
1654                                 if (!port->ioaddr)
1655                                         goto copy;
1656
1657                                 if (!port->port.tty || !port->port.tty->termios)
1658                                         ms.cflag = port->normal_termios.c_cflag;
1659                                 else
1660                                         ms.cflag = port->port.tty->termios->c_cflag;
1661
1662                                 status = inb(port->ioaddr + UART_MSR);
1663                                 if (status & UART_MSR_DCD)
1664                                         ms.dcd = 1;
1665                                 if (status & UART_MSR_DSR)
1666                                         ms.dsr = 1;
1667                                 if (status & UART_MSR_CTS)
1668                                         ms.cts = 1;
1669                         copy:
1670                                 if (copy_to_user(msu, &ms, sizeof(ms))) {
1671                                         unlock_kernel();
1672                                         return -EFAULT;
1673                                 }
1674                                 msu++;
1675                         }
1676                 unlock_kernel();
1677                 return 0;
1678         }
1679         case MOXA_ASPP_MON_EXT: {
1680                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1681                 unsigned int cflag, iflag, p;
1682                 u8 opmode;
1683
1684                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1685                 if (!me)
1686                         return -ENOMEM;
1687
1688                 lock_kernel();
1689                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1690                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1691                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1692                                         i = MXSER_BOARDS;
1693                                         break;
1694                                 }
1695                                 port = &mxser_boards[i].ports[j];
1696                                 if (!port->ioaddr)
1697                                         continue;
1698
1699                                 status = mxser_get_msr(port->ioaddr, 0, p);
1700
1701                                 if (status & UART_MSR_TERI)
1702                                         port->icount.rng++;
1703                                 if (status & UART_MSR_DDSR)
1704                                         port->icount.dsr++;
1705                                 if (status & UART_MSR_DDCD)
1706                                         port->icount.dcd++;
1707                                 if (status & UART_MSR_DCTS)
1708                                         port->icount.cts++;
1709
1710                                 port->mon_data.modem_status = status;
1711                                 me->rx_cnt[p] = port->mon_data.rxcnt;
1712                                 me->tx_cnt[p] = port->mon_data.txcnt;
1713                                 me->up_rxcnt[p] = port->mon_data.up_rxcnt;
1714                                 me->up_txcnt[p] = port->mon_data.up_txcnt;
1715                                 me->modem_status[p] =
1716                                         port->mon_data.modem_status;
1717                                 me->baudrate[p] = tty_get_baud_rate(port->port.tty);
1718
1719                                 if (!port->port.tty || !port->port.tty->termios) {
1720                                         cflag = port->normal_termios.c_cflag;
1721                                         iflag = port->normal_termios.c_iflag;
1722                                 } else {
1723                                         cflag = port->port.tty->termios->c_cflag;
1724                                         iflag = port->port.tty->termios->c_iflag;
1725                                 }
1726
1727                                 me->databits[p] = cflag & CSIZE;
1728                                 me->stopbits[p] = cflag & CSTOPB;
1729                                 me->parity[p] = cflag & (PARENB | PARODD |
1730                                                 CMSPAR);
1731
1732                                 if (cflag & CRTSCTS)
1733                                         me->flowctrl[p] |= 0x03;
1734
1735                                 if (iflag & (IXON | IXOFF))
1736                                         me->flowctrl[p] |= 0x0C;
1737
1738                                 if (port->type == PORT_16550A)
1739                                         me->fifo[p] = 1;
1740
1741                                 opmode = inb(port->opmode_ioaddr) >>
1742                                                 ((p % 4) * 2);
1743                                 opmode &= OP_MODE_MASK;
1744                                 me->iftype[p] = opmode;
1745                         }
1746                 }
1747                 unlock_kernel();
1748                 if (copy_to_user(argp, me, sizeof(*me)))
1749                         ret = -EFAULT;
1750                 kfree(me);
1751                 return ret;
1752         }
1753         default:
1754                 return -ENOIOCTLCMD;
1755         }
1756         return 0;
1757 }
1758
1759 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1760                 struct async_icount *cprev)
1761 {
1762         struct async_icount cnow;
1763         unsigned long flags;
1764         int ret;
1765
1766         spin_lock_irqsave(&info->slock, flags);
1767         cnow = info->icount;    /* atomic copy */
1768         spin_unlock_irqrestore(&info->slock, flags);
1769
1770         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1771                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1772                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1773                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1774
1775         *cprev = cnow;
1776
1777         return ret;
1778 }
1779
1780 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1781                 unsigned int cmd, unsigned long arg)
1782 {
1783         struct mxser_port *info = tty->driver_data;
1784         struct async_icount cnow;
1785         unsigned long flags;
1786         void __user *argp = (void __user *)arg;
1787         int retval;
1788
1789         if (tty->index == MXSER_PORTS)
1790                 return mxser_ioctl_special(cmd, argp);
1791
1792         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1793                 int p;
1794                 unsigned long opmode;
1795                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1796                 int shiftbit;
1797                 unsigned char val, mask;
1798
1799                 p = tty->index % 4;
1800                 if (cmd == MOXA_SET_OP_MODE) {
1801                         if (get_user(opmode, (int __user *) argp))
1802                                 return -EFAULT;
1803                         if (opmode != RS232_MODE &&
1804                                         opmode != RS485_2WIRE_MODE &&
1805                                         opmode != RS422_MODE &&
1806                                         opmode != RS485_4WIRE_MODE)
1807                                 return -EFAULT;
1808                         lock_kernel();
1809                         mask = ModeMask[p];
1810                         shiftbit = p * 2;
1811                         val = inb(info->opmode_ioaddr);
1812                         val &= mask;
1813                         val |= (opmode << shiftbit);
1814                         outb(val, info->opmode_ioaddr);
1815                         unlock_kernel();
1816                 } else {
1817                         lock_kernel();
1818                         shiftbit = p * 2;
1819                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1820                         opmode &= OP_MODE_MASK;
1821                         unlock_kernel();
1822                         if (put_user(opmode, (int __user *)argp))
1823                                 return -EFAULT;
1824                 }
1825                 return 0;
1826         }
1827
1828         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1829                         test_bit(TTY_IO_ERROR, &tty->flags))
1830                 return -EIO;
1831
1832         switch (cmd) {
1833         case TIOCGSERIAL:
1834                 lock_kernel();
1835                 retval = mxser_get_serial_info(info, argp);
1836                 unlock_kernel();
1837                 return retval;
1838         case TIOCSSERIAL:
1839                 lock_kernel();
1840                 retval = mxser_set_serial_info(info, argp);
1841                 unlock_kernel();
1842                 return retval;
1843         case TIOCSERGETLSR:     /* Get line status register */
1844                 return  mxser_get_lsr_info(info, argp);
1845                 /*
1846                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1847                  * - mask passed in arg for lines of interest
1848                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1849                  * Caller should use TIOCGICOUNT to see which one it was
1850                  */
1851         case TIOCMIWAIT:
1852                 spin_lock_irqsave(&info->slock, flags);
1853                 cnow = info->icount;    /* note the counters on entry */
1854                 spin_unlock_irqrestore(&info->slock, flags);
1855
1856                 return wait_event_interruptible(info->delta_msr_wait,
1857                                 mxser_cflags_changed(info, arg, &cnow));
1858         /*
1859          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1860          * Return: write counters to the user passed counter struct
1861          * NB: both 1->0 and 0->1 transitions are counted except for
1862          *     RI where only 0->1 is counted.
1863          */
1864         case TIOCGICOUNT: {
1865                 struct serial_icounter_struct icnt = { 0 };
1866                 spin_lock_irqsave(&info->slock, flags);
1867                 cnow = info->icount;
1868                 spin_unlock_irqrestore(&info->slock, flags);
1869
1870                 icnt.frame = cnow.frame;
1871                 icnt.brk = cnow.brk;
1872                 icnt.overrun = cnow.overrun;
1873                 icnt.buf_overrun = cnow.buf_overrun;
1874                 icnt.parity = cnow.parity;
1875                 icnt.rx = cnow.rx;
1876                 icnt.tx = cnow.tx;
1877                 icnt.cts = cnow.cts;
1878                 icnt.dsr = cnow.dsr;
1879                 icnt.rng = cnow.rng;
1880                 icnt.dcd = cnow.dcd;
1881
1882                 return copy_to_user(argp, &icnt, sizeof(icnt)) ? -EFAULT : 0;
1883         }
1884         case MOXA_HighSpeedOn:
1885                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1886         case MOXA_SDS_RSTICOUNTER:
1887                 lock_kernel();
1888                 info->mon_data.rxcnt = 0;
1889                 info->mon_data.txcnt = 0;
1890                 unlock_kernel();
1891                 return 0;
1892
1893         case MOXA_ASPP_OQUEUE:{
1894                 int len, lsr;
1895
1896                 lock_kernel();
1897                 len = mxser_chars_in_buffer(tty);
1898                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1899                 len += (lsr ? 0 : 1);
1900                 unlock_kernel();
1901
1902                 return put_user(len, (int __user *)argp);
1903         }
1904         case MOXA_ASPP_MON: {
1905                 int mcr, status;
1906
1907                 lock_kernel();
1908                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1909                 mxser_check_modem_status(info, status);
1910
1911                 mcr = inb(info->ioaddr + UART_MCR);
1912                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1913                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1914                 else
1915                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1916
1917                 if (mcr & MOXA_MUST_MCR_TX_XON)
1918                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1919                 else
1920                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1921
1922                 if (info->port.tty->hw_stopped)
1923                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1924                 else
1925                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1926                 unlock_kernel();
1927                 if (copy_to_user(argp, &info->mon_data,
1928                                 sizeof(struct mxser_mon)))
1929                         return -EFAULT;
1930
1931                 return 0;
1932         }
1933         case MOXA_ASPP_LSTATUS: {
1934                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1935                         return -EFAULT;
1936
1937                 info->err_shadow = 0;
1938                 return 0;
1939         }
1940         case MOXA_SET_BAUD_METHOD: {
1941                 int method;
1942
1943                 if (get_user(method, (int __user *)argp))
1944                         return -EFAULT;
1945                 mxser_set_baud_method[tty->index] = method;
1946                 return put_user(method, (int __user *)argp);
1947         }
1948         default:
1949                 return -ENOIOCTLCMD;
1950         }
1951         return 0;
1952 }
1953
1954 static void mxser_stoprx(struct tty_struct *tty)
1955 {
1956         struct mxser_port *info = tty->driver_data;
1957
1958         info->ldisc_stop_rx = 1;
1959         if (I_IXOFF(tty)) {
1960                 if (info->board->chip_flag) {
1961                         info->IER &= ~MOXA_MUST_RECV_ISR;
1962                         outb(info->IER, info->ioaddr + UART_IER);
1963                 } else {
1964                         info->x_char = STOP_CHAR(tty);
1965                         outb(0, info->ioaddr + UART_IER);
1966                         info->IER |= UART_IER_THRI;
1967                         outb(info->IER, info->ioaddr + UART_IER);
1968                 }
1969         }
1970
1971         if (info->port.tty->termios->c_cflag & CRTSCTS) {
1972                 info->MCR &= ~UART_MCR_RTS;
1973                 outb(info->MCR, info->ioaddr + UART_MCR);
1974         }
1975 }
1976
1977 /*
1978  * This routine is called by the upper-layer tty layer to signal that
1979  * incoming characters should be throttled.
1980  */
1981 static void mxser_throttle(struct tty_struct *tty)
1982 {
1983         mxser_stoprx(tty);
1984 }
1985
1986 static void mxser_unthrottle(struct tty_struct *tty)
1987 {
1988         struct mxser_port *info = tty->driver_data;
1989
1990         /* startrx */
1991         info->ldisc_stop_rx = 0;
1992         if (I_IXOFF(tty)) {
1993                 if (info->x_char)
1994                         info->x_char = 0;
1995                 else {
1996                         if (info->board->chip_flag) {
1997                                 info->IER |= MOXA_MUST_RECV_ISR;
1998                                 outb(info->IER, info->ioaddr + UART_IER);
1999                         } else {
2000                                 info->x_char = START_CHAR(tty);
2001                                 outb(0, info->ioaddr + UART_IER);
2002                                 info->IER |= UART_IER_THRI;
2003                                 outb(info->IER, info->ioaddr + UART_IER);
2004                         }
2005                 }
2006         }
2007
2008         if (info->port.tty->termios->c_cflag & CRTSCTS) {
2009                 info->MCR |= UART_MCR_RTS;
2010                 outb(info->MCR, info->ioaddr + UART_MCR);
2011         }
2012 }
2013
2014 /*
2015  * mxser_stop() and mxser_start()
2016  *
2017  * This routines are called before setting or resetting tty->stopped.
2018  * They enable or disable transmitter interrupts, as necessary.
2019  */
2020 static void mxser_stop(struct tty_struct *tty)
2021 {
2022         struct mxser_port *info = tty->driver_data;
2023         unsigned long flags;
2024
2025         spin_lock_irqsave(&info->slock, flags);
2026         if (info->IER & UART_IER_THRI) {
2027                 info->IER &= ~UART_IER_THRI;
2028                 outb(info->IER, info->ioaddr + UART_IER);
2029         }
2030         spin_unlock_irqrestore(&info->slock, flags);
2031 }
2032
2033 static void mxser_start(struct tty_struct *tty)
2034 {
2035         struct mxser_port *info = tty->driver_data;
2036         unsigned long flags;
2037
2038         spin_lock_irqsave(&info->slock, flags);
2039         if (info->xmit_cnt && info->port.xmit_buf) {
2040                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2041                 info->IER |= UART_IER_THRI;
2042                 outb(info->IER, info->ioaddr + UART_IER);
2043         }
2044         spin_unlock_irqrestore(&info->slock, flags);
2045 }
2046
2047 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2048 {
2049         struct mxser_port *info = tty->driver_data;
2050         unsigned long flags;
2051
2052         spin_lock_irqsave(&info->slock, flags);
2053         mxser_change_speed(info, old_termios);
2054         spin_unlock_irqrestore(&info->slock, flags);
2055
2056         if ((old_termios->c_cflag & CRTSCTS) &&
2057                         !(tty->termios->c_cflag & CRTSCTS)) {
2058                 tty->hw_stopped = 0;
2059                 mxser_start(tty);
2060         }
2061
2062         /* Handle sw stopped */
2063         if ((old_termios->c_iflag & IXON) &&
2064                         !(tty->termios->c_iflag & IXON)) {
2065                 tty->stopped = 0;
2066
2067                 if (info->board->chip_flag) {
2068                         spin_lock_irqsave(&info->slock, flags);
2069                         mxser_disable_must_rx_software_flow_control(
2070                                         info->ioaddr);
2071                         spin_unlock_irqrestore(&info->slock, flags);
2072                 }
2073
2074                 mxser_start(tty);
2075         }
2076 }
2077
2078 /*
2079  * mxser_wait_until_sent() --- wait until the transmitter is empty
2080  */
2081 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2082 {
2083         struct mxser_port *info = tty->driver_data;
2084         unsigned long orig_jiffies, char_time;
2085         int lsr;
2086
2087         if (info->type == PORT_UNKNOWN)
2088                 return;
2089
2090         if (info->xmit_fifo_size == 0)
2091                 return;         /* Just in case.... */
2092
2093         orig_jiffies = jiffies;
2094         /*
2095          * Set the check interval to be 1/5 of the estimated time to
2096          * send a single character, and make it at least 1.  The check
2097          * interval should also be less than the timeout.
2098          *
2099          * Note: we have to use pretty tight timings here to satisfy
2100          * the NIST-PCTS.
2101          */
2102         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2103         char_time = char_time / 5;
2104         if (char_time == 0)
2105                 char_time = 1;
2106         if (timeout && timeout < char_time)
2107                 char_time = timeout;
2108         /*
2109          * If the transmitter hasn't cleared in twice the approximate
2110          * amount of time to send the entire FIFO, it probably won't
2111          * ever clear.  This assumes the UART isn't doing flow
2112          * control, which is currently the case.  Hence, if it ever
2113          * takes longer than info->timeout, this is probably due to a
2114          * UART bug of some kind.  So, we clamp the timeout parameter at
2115          * 2*info->timeout.
2116          */
2117         if (!timeout || timeout > 2 * info->timeout)
2118                 timeout = 2 * info->timeout;
2119 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2120         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2121                 timeout, char_time);
2122         printk("jiff=%lu...", jiffies);
2123 #endif
2124         lock_kernel();
2125         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2126 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2127                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2128 #endif
2129                 schedule_timeout_interruptible(char_time);
2130                 if (signal_pending(current))
2131                         break;
2132                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2133                         break;
2134         }
2135         set_current_state(TASK_RUNNING);
2136         unlock_kernel();
2137
2138 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2139         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2140 #endif
2141 }
2142
2143 /*
2144  * This routine is called by tty_hangup() when a hangup is signaled.
2145  */
2146 static void mxser_hangup(struct tty_struct *tty)
2147 {
2148         struct mxser_port *info = tty->driver_data;
2149
2150         mxser_flush_buffer(tty);
2151         mxser_shutdown(info);
2152         info->port.count = 0;
2153         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2154         info->port.tty = NULL;
2155         wake_up_interruptible(&info->port.open_wait);
2156 }
2157
2158 /*
2159  * mxser_rs_break() --- routine which turns the break handling on or off
2160  */
2161 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2162 {
2163         struct mxser_port *info = tty->driver_data;
2164         unsigned long flags;
2165
2166         spin_lock_irqsave(&info->slock, flags);
2167         if (break_state == -1)
2168                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2169                         info->ioaddr + UART_LCR);
2170         else
2171                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2172                         info->ioaddr + UART_LCR);
2173         spin_unlock_irqrestore(&info->slock, flags);
2174         return 0;
2175 }
2176
2177 static void mxser_receive_chars(struct mxser_port *port, int *status)
2178 {
2179         struct tty_struct *tty = port->port.tty;
2180         unsigned char ch, gdl;
2181         int ignored = 0;
2182         int cnt = 0;
2183         int recv_room;
2184         int max = 256;
2185
2186         recv_room = tty->receive_room;
2187         if ((recv_room == 0) && (!port->ldisc_stop_rx))
2188                 mxser_stoprx(tty);
2189
2190         if (port->board->chip_flag != MOXA_OTHER_UART) {
2191
2192                 if (*status & UART_LSR_SPECIAL)
2193                         goto intr_old;
2194                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2195                                 (*status & MOXA_MUST_LSR_RERR))
2196                         goto intr_old;
2197                 if (*status & MOXA_MUST_LSR_RERR)
2198                         goto intr_old;
2199
2200                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2201
2202                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2203                         gdl &= MOXA_MUST_GDL_MASK;
2204                 if (gdl >= recv_room) {
2205                         if (!port->ldisc_stop_rx)
2206                                 mxser_stoprx(tty);
2207                 }
2208                 while (gdl--) {
2209                         ch = inb(port->ioaddr + UART_RX);
2210                         tty_insert_flip_char(tty, ch, 0);
2211                         cnt++;
2212                 }
2213                 goto end_intr;
2214         }
2215 intr_old:
2216
2217         do {
2218                 if (max-- < 0)
2219                         break;
2220
2221                 ch = inb(port->ioaddr + UART_RX);
2222                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2223                         outb(0x23, port->ioaddr + UART_FCR);
2224                 *status &= port->read_status_mask;
2225                 if (*status & port->ignore_status_mask) {
2226                         if (++ignored > 100)
2227                                 break;
2228                 } else {
2229                         char flag = 0;
2230                         if (*status & UART_LSR_SPECIAL) {
2231                                 if (*status & UART_LSR_BI) {
2232                                         flag = TTY_BREAK;
2233                                         port->icount.brk++;
2234
2235                                         if (port->port.flags & ASYNC_SAK)
2236                                                 do_SAK(tty);
2237                                 } else if (*status & UART_LSR_PE) {
2238                                         flag = TTY_PARITY;
2239                                         port->icount.parity++;
2240                                 } else if (*status & UART_LSR_FE) {
2241                                         flag = TTY_FRAME;
2242                                         port->icount.frame++;
2243                                 } else if (*status & UART_LSR_OE) {
2244                                         flag = TTY_OVERRUN;
2245                                         port->icount.overrun++;
2246                                 } else
2247                                         flag = TTY_BREAK;
2248                         }
2249                         tty_insert_flip_char(tty, ch, flag);
2250                         cnt++;
2251                         if (cnt >= recv_room) {
2252                                 if (!port->ldisc_stop_rx)
2253                                         mxser_stoprx(tty);
2254                                 break;
2255                         }
2256
2257                 }
2258
2259                 if (port->board->chip_flag)
2260                         break;
2261
2262                 *status = inb(port->ioaddr + UART_LSR);
2263         } while (*status & UART_LSR_DR);
2264
2265 end_intr:
2266         mxvar_log.rxcnt[port->port.tty->index] += cnt;
2267         port->mon_data.rxcnt += cnt;
2268         port->mon_data.up_rxcnt += cnt;
2269
2270         /*
2271          * We are called from an interrupt context with &port->slock
2272          * being held. Drop it temporarily in order to prevent
2273          * recursive locking.
2274          */
2275         spin_unlock(&port->slock);
2276         tty_flip_buffer_push(tty);
2277         spin_lock(&port->slock);
2278 }
2279
2280 static void mxser_transmit_chars(struct mxser_port *port)
2281 {
2282         int count, cnt;
2283
2284         if (port->x_char) {
2285                 outb(port->x_char, port->ioaddr + UART_TX);
2286                 port->x_char = 0;
2287                 mxvar_log.txcnt[port->port.tty->index]++;
2288                 port->mon_data.txcnt++;
2289                 port->mon_data.up_txcnt++;
2290                 port->icount.tx++;
2291                 return;
2292         }
2293
2294         if (port->port.xmit_buf == NULL)
2295                 return;
2296
2297         if ((port->xmit_cnt <= 0) || port->port.tty->stopped ||
2298                         (port->port.tty->hw_stopped &&
2299                         (port->type != PORT_16550A) &&
2300                         (!port->board->chip_flag))) {
2301                 port->IER &= ~UART_IER_THRI;
2302                 outb(port->IER, port->ioaddr + UART_IER);
2303                 return;
2304         }
2305
2306         cnt = port->xmit_cnt;
2307         count = port->xmit_fifo_size;
2308         do {
2309                 outb(port->port.xmit_buf[port->xmit_tail++],
2310                         port->ioaddr + UART_TX);
2311                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2312                 if (--port->xmit_cnt <= 0)
2313                         break;
2314         } while (--count > 0);
2315         mxvar_log.txcnt[port->port.tty->index] += (cnt - port->xmit_cnt);
2316
2317         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2318         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2319         port->icount.tx += (cnt - port->xmit_cnt);
2320
2321         if (port->xmit_cnt < WAKEUP_CHARS)
2322                 tty_wakeup(port->port.tty);
2323
2324         if (port->xmit_cnt <= 0) {
2325                 port->IER &= ~UART_IER_THRI;
2326                 outb(port->IER, port->ioaddr + UART_IER);
2327         }
2328 }
2329
2330 /*
2331  * This is the serial driver's generic interrupt routine
2332  */
2333 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2334 {
2335         int status, iir, i;
2336         struct mxser_board *brd = NULL;
2337         struct mxser_port *port;
2338         int max, irqbits, bits, msr;
2339         unsigned int int_cnt, pass_counter = 0;
2340         int handled = IRQ_NONE;
2341
2342         for (i = 0; i < MXSER_BOARDS; i++)
2343                 if (dev_id == &mxser_boards[i]) {
2344                         brd = dev_id;
2345                         break;
2346                 }
2347
2348         if (i == MXSER_BOARDS)
2349                 goto irq_stop;
2350         if (brd == NULL)
2351                 goto irq_stop;
2352         max = brd->info->nports;
2353         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2354                 irqbits = inb(brd->vector) & brd->vector_mask;
2355                 if (irqbits == brd->vector_mask)
2356                         break;
2357
2358                 handled = IRQ_HANDLED;
2359                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2360                         if (irqbits == brd->vector_mask)
2361                                 break;
2362                         if (bits & irqbits)
2363                                 continue;
2364                         port = &brd->ports[i];
2365
2366                         int_cnt = 0;
2367                         spin_lock(&port->slock);
2368                         do {
2369                                 iir = inb(port->ioaddr + UART_IIR);
2370                                 if (iir & UART_IIR_NO_INT)
2371                                         break;
2372                                 iir &= MOXA_MUST_IIR_MASK;
2373                                 if (!port->port.tty ||
2374                                                 (port->port.flags & ASYNC_CLOSING) ||
2375                                                 !(port->port.flags &
2376                                                         ASYNC_INITIALIZED)) {
2377                                         status = inb(port->ioaddr + UART_LSR);
2378                                         outb(0x27, port->ioaddr + UART_FCR);
2379                                         inb(port->ioaddr + UART_MSR);
2380                                         break;
2381                                 }
2382
2383                                 status = inb(port->ioaddr + UART_LSR);
2384
2385                                 if (status & UART_LSR_PE)
2386                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2387                                 if (status & UART_LSR_FE)
2388                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2389                                 if (status & UART_LSR_OE)
2390                                         port->err_shadow |=
2391                                                 NPPI_NOTIFY_HW_OVERRUN;
2392                                 if (status & UART_LSR_BI)
2393                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2394
2395                                 if (port->board->chip_flag) {
2396                                         if (iir == MOXA_MUST_IIR_GDA ||
2397                                             iir == MOXA_MUST_IIR_RDA ||
2398                                             iir == MOXA_MUST_IIR_RTO ||
2399                                             iir == MOXA_MUST_IIR_LSR)
2400                                                 mxser_receive_chars(port,
2401                                                                 &status);
2402
2403                                 } else {
2404                                         status &= port->read_status_mask;
2405                                         if (status & UART_LSR_DR)
2406                                                 mxser_receive_chars(port,
2407                                                                 &status);
2408                                 }
2409                                 msr = inb(port->ioaddr + UART_MSR);
2410                                 if (msr & UART_MSR_ANY_DELTA)
2411                                         mxser_check_modem_status(port, msr);
2412
2413                                 if (port->board->chip_flag) {
2414                                         if (iir == 0x02 && (status &
2415                                                                 UART_LSR_THRE))
2416                                                 mxser_transmit_chars(port);
2417                                 } else {
2418                                         if (status & UART_LSR_THRE)
2419                                                 mxser_transmit_chars(port);
2420                                 }
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 long cap;
2767         unsigned int i, m, isaloop;
2768         int retval, b;
2769
2770         pr_debug("Loading module mxser ...\n");
2771
2772         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2773         if (!mxvar_sdriver)
2774                 return -ENOMEM;
2775
2776         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2777                 MXSER_VERSION);
2778
2779         /* Initialize the tty_driver structure */
2780         mxvar_sdriver->owner = THIS_MODULE;
2781         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2782         mxvar_sdriver->name = "ttyMI";
2783         mxvar_sdriver->major = ttymajor;
2784         mxvar_sdriver->minor_start = 0;
2785         mxvar_sdriver->num = MXSER_PORTS + 1;
2786         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2787         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2788         mxvar_sdriver->init_termios = tty_std_termios;
2789         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2790         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2791         tty_set_operations(mxvar_sdriver, &mxser_ops);
2792
2793         retval = tty_register_driver(mxvar_sdriver);
2794         if (retval) {
2795                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2796                                 "tty driver !\n");
2797                 goto err_put;
2798         }
2799
2800         m = 0;
2801         /* Start finding ISA boards here */
2802         for (isaloop = 0; isaloop < 2; isaloop++)
2803                 for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
2804                         if (!isaloop)
2805                                 cap = mxserBoardCAP[b]; /* predefined */
2806                         else
2807                                 cap = ioaddr[b]; /* module param */
2808
2809                         if (!cap)
2810                                 continue;
2811
2812                         brd = &mxser_boards[m];
2813                         retval = mxser_get_ISA_conf(cap, brd);
2814                         if (retval <= 0) {
2815                                 brd->info = NULL;
2816                                 continue;
2817                         }
2818
2819                         printk(KERN_INFO "mxser: found MOXA %s board "
2820                                 "(CAP=0x%x)\n", brd->info->name, ioaddr[b]);
2821
2822                         /* mxser_initbrd will hook ISR. */
2823                         if (mxser_initbrd(brd, NULL) < 0) {
2824                                 brd->info = NULL;
2825                                 continue;
2826                         }
2827
2828                         brd->idx = m * MXSER_PORTS_PER_BOARD;
2829                         for (i = 0; i < brd->info->nports; i++)
2830                                 tty_register_device(mxvar_sdriver, brd->idx + i,
2831                                                 NULL);
2832
2833                         m++;
2834                 }
2835
2836         retval = pci_register_driver(&mxser_driver);
2837         if (retval) {
2838                 printk(KERN_ERR "mxser: can't register pci driver\n");
2839                 if (!m) {
2840                         retval = -ENODEV;
2841                         goto err_unr;
2842                 } /* else: we have some ISA cards under control */
2843         }
2844
2845         pr_debug("Done.\n");
2846
2847         return 0;
2848 err_unr:
2849         tty_unregister_driver(mxvar_sdriver);
2850 err_put:
2851         put_tty_driver(mxvar_sdriver);
2852         return retval;
2853 }
2854
2855 static void __exit mxser_module_exit(void)
2856 {
2857         unsigned int i, j;
2858
2859         pr_debug("Unloading module mxser ...\n");
2860
2861         pci_unregister_driver(&mxser_driver);
2862
2863         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2864                 if (mxser_boards[i].info != NULL)
2865                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2866                                 tty_unregister_device(mxvar_sdriver,
2867                                                 mxser_boards[i].idx + j);
2868         tty_unregister_driver(mxvar_sdriver);
2869         put_tty_driver(mxvar_sdriver);
2870
2871         for (i = 0; i < MXSER_BOARDS; i++)
2872                 if (mxser_boards[i].info != NULL)
2873                         mxser_release_res(&mxser_boards[i], NULL, 1);
2874
2875         pr_debug("Done.\n");
2876 }
2877
2878 module_init(mxser_module_init);
2879 module_exit(mxser_module_exit);