drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
  18  *      - Fixed x86_64 cleanness
  19  *      - Fixed sleep with spinlock held in mxser_send_break
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/serial.h>
  31 #include <linux/serial_reg.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/gfp.h>
  37 #include <linux/ioport.h>
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/pci.h>
  41 #include <linux/bitops.h>
  42
  43 #include <asm/system.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.3"         /* 1.11 */
  51 #define MXSERMAJOR       174
  52 #define MXSERCUMAJOR     175
  53
  54 #define MXSER_BOARDS            4       /* Max. boards */
  55 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  56 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  57 #define MXSER_ISR_PASS_LIMIT    100
  58
  59 #define MXSER_ERR_IOADDR        -1
  60 #define MXSER_ERR_IRQ           -2
  61 #define MXSER_ERR_IRQ_CONFLIT   -3
  62 #define MXSER_ERR_VECTOR        -4
  63
  64 /*CheckIsMoxaMust return value*/
  65 #define MOXA_OTHER_UART         0x00
  66 #define MOXA_MUST_MU150_HWID    0x01
  67 #define MOXA_MUST_MU860_HWID    0x02
  68
  69 #define WAKEUP_CHARS            256
  70
  71 #define UART_MCR_AFE            0x20
  72 #define UART_LSR_SPECIAL        0x1E
  73
  74 #define PCI_DEVICE_ID_CB108     0x1080
  75 #define PCI_DEVICE_ID_CB114     0x1142
  76 #define PCI_DEVICE_ID_CP114UL   0x1143
  77 #define PCI_DEVICE_ID_CB134I    0x1341
  78 #define PCI_DEVICE_ID_CP138U    0x1380
  79 #define PCI_DEVICE_ID_POS104UL  0x1044
  80
  81
  82 #define C168_ASIC_ID    1
  83 #define C104_ASIC_ID    2
  84 #define C102_ASIC_ID    0xB
  85 #define CI132_ASIC_ID   4
  86 #define CI134_ASIC_ID   3
  87 #define CI104J_ASIC_ID  5
  88
  89 #define MXSER_HIGHBAUD  1
  90 #define MXSER_HAS2      2
  91
  92 /* This is only for PCI */
  93 static const struct {
  94         int type;
  95         int tx_fifo;
  96         int rx_fifo;
  97         int xmit_fifo_size;
  98         int rx_high_water;
  99         int rx_trigger;
 100         int rx_low_water;
 101         long max_baud;
 102 } Gpci_uart_info[] = {
 103         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 104         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 105         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 106 };
 107 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 108
 109 struct mxser_cardinfo {
 110         char *name;
 111         unsigned int nports;
 112         unsigned int flags;
 113 };
 114
 115 static const struct mxser_cardinfo mxser_cards[] = {
 116 /* 0*/  { "C168 series",        8, },
 117         { "C104 series",        4, },
 118         { "CI-104J series",     4, },
 119         { "C168H/PCI series",   8, },
 120         { "C104H/PCI series",   4, },
 121 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 122         { "CI-132 series",      4, MXSER_HAS2 },
 123         { "CI-134 series",      4, },
 124         { "CP-132 series",      2, },
 125         { "CP-114 series",      4, },
 126 /*10*/  { "CT-114 series",      4, },
 127         { "CP-102 series",      2, MXSER_HIGHBAUD },
 128         { "CP-104U series",     4, },
 129         { "CP-168U series",     8, },
 130         { "CP-132U series",     2, },
 131 /*15*/  { "CP-134U series",     4, },
 132         { "CP-104JU series",    4, },
 133         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 134         { "CP-118U series",     8, },
 135         { "CP-102UL series",    2, },
 136 /*20*/  { "CP-102U series",     2, },
 137         { "CP-118EL series",    8, },
 138         { "CP-168EL series",    8, },
 139         { "CP-104EL series",    4, },
 140         { "CB-108 series",      8, },
 141 /*25*/  { "CB-114 series",      4, },
 142         { "CB-134I series",     4, },
 143         { "CP-138U series",     8, },
 144         { "POS-104UL series",   4, },
 145         { "CP-114UL series",    4, }
 146 };
 147
 148 /* driver_data correspond to the lines in the structure above
 149    see also ISA probe function before you change something */
 150 static struct pci_device_id mxser_pcibrds[] = {
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 178
 179 static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 180 static int ttymajor = MXSERMAJOR;
 181
 182 /* Variables for insmod */
 183
 184 MODULE_AUTHOR("Casper Yang");
 185 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 186 module_param_array(ioaddr, int, NULL, 0);
 187 module_param(ttymajor, int, 0);
 188 MODULE_LICENSE("GPL");
 189
 190 struct mxser_log {
 191         int tick;
 192         unsigned long rxcnt[MXSER_PORTS];
 193         unsigned long txcnt[MXSER_PORTS];
 194 };
 195
 196
 197 struct mxser_mon {
 198         unsigned long rxcnt;
 199         unsigned long txcnt;
 200         unsigned long up_rxcnt;
 201         unsigned long up_txcnt;
 202         int modem_status;
 203         unsigned char hold_reason;
 204 };
 205
 206 struct mxser_mon_ext {
 207         unsigned long rx_cnt[32];
 208         unsigned long tx_cnt[32];
 209         unsigned long up_rxcnt[32];
 210         unsigned long up_txcnt[32];
 211         int modem_status[32];
 212
 213         long baudrate[32];
 214         int databits[32];
 215         int stopbits[32];
 216         int parity[32];
 217         int flowctrl[32];
 218         int fifo[32];
 219         int iftype[32];
 220 };
 221
 222 struct mxser_board;
 223
 224 struct mxser_port {
 225         struct mxser_board *board;
 226         struct tty_struct *tty;
 227
 228         unsigned long ioaddr;
 229         unsigned long opmode_ioaddr;
 230         int max_baud;
 231
 232         int rx_high_water;
 233         int rx_trigger;         /* Rx fifo trigger level */
 234         int rx_low_water;
 235         int baud_base;          /* max. speed */
 236         int type;               /* UART type */
 237         int flags;              /* defined in tty.h */
 238
 239         int x_char;             /* xon/xoff character */
 240         int IER;                /* Interrupt Enable Register */
 241         int MCR;                /* Modem control register */
 242
 243         unsigned char stop_rx;
 244         unsigned char ldisc_stop_rx;
 245
 246         int custom_divisor;
 247         int close_delay;
 248         unsigned short closing_wait;
 249         unsigned char err_shadow;
 250         unsigned long event;
 251
 252         int count;              /* # of fd on device */
 253         int blocked_open;       /* # of blocked opens */
 254         struct async_icount icount; /* kernel counters for 4 input interrupts */
 255         int timeout;
 256
 257         int read_status_mask;
 258         int ignore_status_mask;
 259         int xmit_fifo_size;
 260         unsigned char *xmit_buf;
 261         int xmit_head;
 262         int xmit_tail;
 263         int xmit_cnt;
 264
 265         struct ktermios normal_termios;
 266
 267         struct mxser_mon mon_data;
 268
 269         spinlock_t slock;
 270         wait_queue_head_t open_wait;
 271         wait_queue_head_t delta_msr_wait;
 272 };
 273
 274 struct mxser_board {
 275         unsigned int idx;
 276         int irq;
 277         const struct mxser_cardinfo *info;
 278         unsigned long vector;
 279         unsigned long vector_mask;
 280
 281         int chip_flag;
 282         int uart_type;
 283
 284         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 285 };
 286
 287 struct mxser_mstatus {
 288         tcflag_t cflag;
 289         int cts;
 290         int dsr;
 291         int ri;
 292         int dcd;
 293 };
 294
 295 static struct mxser_mstatus GMStatus[MXSER_PORTS];
 296
 297 static int mxserBoardCAP[MXSER_BOARDS] = {
 298         0, 0, 0, 0
 299         /*  0x180, 0x280, 0x200, 0x320 */
 300 };
 301
 302 static struct mxser_board mxser_boards[MXSER_BOARDS];
 303 static struct tty_driver *mxvar_sdriver;
 304 static struct mxser_log mxvar_log;
 305 static int mxvar_diagflag;
 306 static unsigned char mxser_msr[MXSER_PORTS + 1];
 307 static struct mxser_mon_ext mon_data_ext;
 308 static int mxser_set_baud_method[MXSER_PORTS + 1];
 309
 310 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 311 {
 312         u8 oldlcr;
 313         u8 efr;
 314
 315         oldlcr = inb(baseio + UART_LCR);
 316         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 317
 318         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 319         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 320
 321         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 322         outb(oldlcr, baseio + UART_LCR);
 323 }
 324
 325 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 326 {
 327         u8 oldlcr;
 328         u8 efr;
 329
 330         oldlcr = inb(baseio + UART_LCR);
 331         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 332
 333         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 334         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 335
 336         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 337         outb(oldlcr, baseio + UART_LCR);
 338 }
 339
 340 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 341 {
 342         u8 oldlcr;
 343         u8 efr;
 344
 345         oldlcr = inb(baseio + UART_LCR);
 346         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 347
 348         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 349         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 350         efr |= MOXA_MUST_EFR_BANK0;
 351
 352         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 353         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 354         outb(oldlcr, baseio + UART_LCR);
 355 }
 356
 357 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 358 {
 359         u8 oldlcr;
 360         u8 efr;
 361
 362         oldlcr = inb(baseio + UART_LCR);
 363         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 364
 365         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 366         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 367         efr |= MOXA_MUST_EFR_BANK0;
 368
 369         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 370         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 371         outb(oldlcr, baseio + UART_LCR);
 372 }
 373
 374 static void mxser_set_must_fifo_value(struct mxser_port *info)
 375 {
 376         u8 oldlcr;
 377         u8 efr;
 378
 379         oldlcr = inb(info->ioaddr + UART_LCR);
 380         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 381
 382         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 383         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 384         efr |= MOXA_MUST_EFR_BANK1;
 385
 386         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 387         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 388         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 389         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 390         outb(oldlcr, info->ioaddr + UART_LCR);
 391 }
 392
 393 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 394 {
 395         u8 oldlcr;
 396         u8 efr;
 397
 398         oldlcr = inb(baseio + UART_LCR);
 399         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 400
 401         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 402         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 403         efr |= MOXA_MUST_EFR_BANK2;
 404
 405         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 406         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 407         outb(oldlcr, baseio + UART_LCR);
 408 }
 409
 410 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 411 {
 412         u8 oldlcr;
 413         u8 efr;
 414
 415         oldlcr = inb(baseio + UART_LCR);
 416         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 417
 418         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 419         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 420         efr |= MOXA_MUST_EFR_BANK2;
 421
 422         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 423         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 424         outb(oldlcr, baseio + UART_LCR);
 425 }
 426
 427 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 428 {
 429         u8 oldlcr;
 430         u8 efr;
 431
 432         oldlcr = inb(baseio + UART_LCR);
 433         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 434
 435         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 436         efr &= ~MOXA_MUST_EFR_SF_MASK;
 437
 438         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 439         outb(oldlcr, baseio + UART_LCR);
 440 }
 441
 442 static void mxser_enable_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         efr |= MOXA_MUST_EFR_SF_TX1;
 453
 454         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 455         outb(oldlcr, baseio + UART_LCR);
 456 }
 457
 458 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 459 {
 460         u8 oldlcr;
 461         u8 efr;
 462
 463         oldlcr = inb(baseio + UART_LCR);
 464         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 465
 466         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 467         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 468
 469         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 470         outb(oldlcr, baseio + UART_LCR);
 471 }
 472
 473 static void mxser_enable_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         efr |= MOXA_MUST_EFR_SF_RX1;
 484
 485         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 486         outb(oldlcr, baseio + UART_LCR);
 487 }
 488
 489 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 490 {
 491         u8 oldlcr;
 492         u8 efr;
 493
 494         oldlcr = inb(baseio + UART_LCR);
 495         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 496
 497         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 498         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 499
 500         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 501         outb(oldlcr, baseio + UART_LCR);
 502 }
 503
 504 #ifdef CONFIG_PCI
 505 static int __devinit CheckIsMoxaMust(unsigned long io)
 506 {
 507         u8 oldmcr, hwid;
 508         int i;
 509
 510         outb(0, io + UART_LCR);
 511         mxser_disable_must_enchance_mode(io);
 512         oldmcr = inb(io + UART_MCR);
 513         outb(0, io + UART_MCR);
 514         mxser_set_must_xon1_value(io, 0x11);
 515         if ((hwid = inb(io + UART_MCR)) != 0) {
 516                 outb(oldmcr, io + UART_MCR);
 517                 return MOXA_OTHER_UART;
 518         }
 519
 520         mxser_get_must_hardware_id(io, &hwid);
 521         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 522                 if (hwid == Gpci_uart_info[i].type)
 523                         return (int)hwid;
 524         }
 525         return MOXA_OTHER_UART;
 526 }
 527 #endif
 528
 529 static void process_txrx_fifo(struct mxser_port *info)
 530 {
 531         int i;
 532
 533         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 534                 info->rx_trigger = 1;
 535                 info->rx_high_water = 1;
 536                 info->rx_low_water = 1;
 537                 info->xmit_fifo_size = 1;
 538         } else
 539                 for (i = 0; i < UART_INFO_NUM; i++)
 540                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 541                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 542                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 543                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 544                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 545                                 break;
 546                         }
 547 }
 548
 549 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 550 {
 551         unsigned char status = 0;
 552
 553         status = inb(baseaddr + UART_MSR);
 554
 555         mxser_msr[port] &= 0x0F;
 556         mxser_msr[port] |= status;
 557         status = mxser_msr[port];
 558         if (mode)
 559                 mxser_msr[port] = 0;
 560
 561         return status;
 562 }
 563
 564 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 565                 struct mxser_port *port)
 566 {
 567         DECLARE_WAITQUEUE(wait, current);
 568         int retval;
 569         int do_clocal = 0;
 570         unsigned long flags;
 571
 572         /*
 573          * If non-blocking mode is set, or the port is not enabled,
 574          * then make the check up front and then exit.
 575          */
 576         if ((filp->f_flags & O_NONBLOCK) ||
 577                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 578                 port->flags |= ASYNC_NORMAL_ACTIVE;
 579                 return 0;
 580         }
 581
 582         if (tty->termios->c_cflag & CLOCAL)
 583                 do_clocal = 1;
 584
 585         /*
 586          * Block waiting for the carrier detect and the line to become
 587          * free (i.e., not in use by the callout).  While we are in
 588          * this loop, port->count is dropped by one, so that
 589          * mxser_close() knows when to free things.  We restore it upon
 590          * exit, either normal or abnormal.
 591          */
 592         retval = 0;
 593         add_wait_queue(&port->open_wait, &wait);
 594
 595         spin_lock_irqsave(&port->slock, flags);
 596         if (!tty_hung_up_p(filp))
 597                 port->count--;
 598         spin_unlock_irqrestore(&port->slock, flags);
 599         port->blocked_open++;
 600         while (1) {
 601                 spin_lock_irqsave(&port->slock, flags);
 602                 outb(inb(port->ioaddr + UART_MCR) |
 603                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 604                 spin_unlock_irqrestore(&port->slock, flags);
 605                 set_current_state(TASK_INTERRUPTIBLE);
 606                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
 607                         if (port->flags & ASYNC_HUP_NOTIFY)
 608                                 retval = -EAGAIN;
 609                         else
 610                                 retval = -ERESTARTSYS;
 611                         break;
 612                 }
 613                 if (!(port->flags & ASYNC_CLOSING) &&
 614                                 (do_clocal ||
 615                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 616                         break;
 617                 if (signal_pending(current)) {
 618                         retval = -ERESTARTSYS;
 619                         break;
 620                 }
 621                 schedule();
 622         }
 623         set_current_state(TASK_RUNNING);
 624         remove_wait_queue(&port->open_wait, &wait);
 625         if (!tty_hung_up_p(filp))
 626                 port->count++;
 627         port->blocked_open--;
 628         if (retval)
 629                 return retval;
 630         port->flags |= ASYNC_NORMAL_ACTIVE;
 631         return 0;
 632 }
 633
 634 static int mxser_set_baud(struct mxser_port *info, long newspd)
 635 {
 636         int quot = 0, baud;
 637         unsigned char cval;
 638
 639         if (!info->tty || !info->tty->termios)
 640                 return -1;
 641
 642         if (!(info->ioaddr))
 643                 return -1;
 644
 645         if (newspd > info->max_baud)
 646                 return -1;
 647
 648         if (newspd == 134) {
 649                 quot = 2 * info->baud_base / 269;
 650                 tty_encode_baud_rate(info->tty, 134, 134);
 651         } else if (newspd) {
 652                 quot = info->baud_base / newspd;
 653                 if (quot == 0)
 654                         quot = 1;
 655                 baud = info->baud_base/quot;
 656                 tty_encode_baud_rate(info->tty, baud, baud);
 657         } else {
 658                 quot = 0;
 659         }
 660
 661         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 662         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 663
 664         if (quot) {
 665                 info->MCR |= UART_MCR_DTR;
 666                 outb(info->MCR, info->ioaddr + UART_MCR);
 667         } else {
 668                 info->MCR &= ~UART_MCR_DTR;
 669                 outb(info->MCR, info->ioaddr + UART_MCR);
 670                 return 0;
 671         }
 672
 673         cval = inb(info->ioaddr + UART_LCR);
 674
 675         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 676
 677         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 678         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 679         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 680
 681 #ifdef BOTHER
 682         if (C_BAUD(info->tty) == BOTHER) {
 683                 quot = info->baud_base % newspd;
 684                 quot *= 8;
 685                 if (quot % newspd > newspd / 2) {
 686                         quot /= newspd;
 687                         quot++;
 688                 } else
 689                         quot /= newspd;
 690
 691                 mxser_set_must_enum_value(info->ioaddr, quot);
 692         } else
 693 #endif
 694                 mxser_set_must_enum_value(info->ioaddr, 0);
 695
 696         return 0;
 697 }
 698
 699 /*
 700  * This routine is called to set the UART divisor registers to match
 701  * the specified baud rate for a serial port.
 702  */
 703 static int mxser_change_speed(struct mxser_port *info,
 704                 struct ktermios *old_termios)
 705 {
 706         unsigned cflag, cval, fcr;
 707         int ret = 0;
 708         unsigned char status;
 709
 710         if (!info->tty || !info->tty->termios)
 711                 return ret;
 712         cflag = info->tty->termios->c_cflag;
 713         if (!(info->ioaddr))
 714                 return ret;
 715
 716         if (mxser_set_baud_method[info->tty->index] == 0)
 717                 mxser_set_baud(info, tty_get_baud_rate(info->tty));
 718
 719         /* byte size and parity */
 720         switch (cflag & CSIZE) {
 721         case CS5:
 722                 cval = 0x00;
 723                 break;
 724         case CS6:
 725                 cval = 0x01;
 726                 break;
 727         case CS7:
 728                 cval = 0x02;
 729                 break;
 730         case CS8:
 731                 cval = 0x03;
 732                 break;
 733         default:
 734                 cval = 0x00;
 735                 break;          /* too keep GCC shut... */
 736         }
 737         if (cflag & CSTOPB)
 738                 cval |= 0x04;
 739         if (cflag & PARENB)
 740                 cval |= UART_LCR_PARITY;
 741         if (!(cflag & PARODD))
 742                 cval |= UART_LCR_EPAR;
 743         if (cflag & CMSPAR)
 744                 cval |= UART_LCR_SPAR;
 745
 746         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 747                 if (info->board->chip_flag) {
 748                         fcr = UART_FCR_ENABLE_FIFO;
 749                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 750                         mxser_set_must_fifo_value(info);
 751                 } else
 752                         fcr = 0;
 753         } else {
 754                 fcr = UART_FCR_ENABLE_FIFO;
 755                 if (info->board->chip_flag) {
 756                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 757                         mxser_set_must_fifo_value(info);
 758                 } else {
 759                         switch (info->rx_trigger) {
 760                         case 1:
 761                                 fcr |= UART_FCR_TRIGGER_1;
 762                                 break;
 763                         case 4:
 764                                 fcr |= UART_FCR_TRIGGER_4;
 765                                 break;
 766                         case 8:
 767                                 fcr |= UART_FCR_TRIGGER_8;
 768                                 break;
 769                         default:
 770                                 fcr |= UART_FCR_TRIGGER_14;
 771                                 break;
 772                         }
 773                 }
 774         }
 775
 776         /* CTS flow control flag and modem status interrupts */
 777         info->IER &= ~UART_IER_MSI;
 778         info->MCR &= ~UART_MCR_AFE;
 779         if (cflag & CRTSCTS) {
 780                 info->flags |= ASYNC_CTS_FLOW;
 781                 info->IER |= UART_IER_MSI;
 782                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 783                         info->MCR |= UART_MCR_AFE;
 784                 } else {
 785                         status = inb(info->ioaddr + UART_MSR);
 786                         if (info->tty->hw_stopped) {
 787                                 if (status & UART_MSR_CTS) {
 788                                         info->tty->hw_stopped = 0;
 789                                         if (info->type != PORT_16550A &&
 790                                                         !info->board->chip_flag) {
 791                                                 outb(info->IER & ~UART_IER_THRI,
 792                                                         info->ioaddr +
 793                                                         UART_IER);
 794                                                 info->IER |= UART_IER_THRI;
 795                                                 outb(info->IER, info->ioaddr +
 796                                                                 UART_IER);
 797                                         }
 798                                         tty_wakeup(info->tty);
 799                                 }
 800                         } else {
 801                                 if (!(status & UART_MSR_CTS)) {
 802                                         info->tty->hw_stopped = 1;
 803                                         if ((info->type != PORT_16550A) &&
 804                                                         (!info->board->chip_flag)) {
 805                                                 info->IER &= ~UART_IER_THRI;
 806                                                 outb(info->IER, info->ioaddr +
 807                                                                 UART_IER);
 808                                         }
 809                                 }
 810                         }
 811                 }
 812         } else {
 813                 info->flags &= ~ASYNC_CTS_FLOW;
 814         }
 815         outb(info->MCR, info->ioaddr + UART_MCR);
 816         if (cflag & CLOCAL) {
 817                 info->flags &= ~ASYNC_CHECK_CD;
 818         } else {
 819                 info->flags |= ASYNC_CHECK_CD;
 820                 info->IER |= UART_IER_MSI;
 821         }
 822         outb(info->IER, info->ioaddr + UART_IER);
 823
 824         /*
 825          * Set up parity check flag
 826          */
 827         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 828         if (I_INPCK(info->tty))
 829                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 830         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
 831                 info->read_status_mask |= UART_LSR_BI;
 832
 833         info->ignore_status_mask = 0;
 834
 835         if (I_IGNBRK(info->tty)) {
 836                 info->ignore_status_mask |= UART_LSR_BI;
 837                 info->read_status_mask |= UART_LSR_BI;
 838                 /*
 839                  * If we're ignore parity and break indicators, ignore
 840                  * overruns too.  (For real raw support).
 841                  */
 842                 if (I_IGNPAR(info->tty)) {
 843                         info->ignore_status_mask |=
 844                                                 UART_LSR_OE |
 845                                                 UART_LSR_PE |
 846                                                 UART_LSR_FE;
 847                         info->read_status_mask |=
 848                                                 UART_LSR_OE |
 849                                                 UART_LSR_PE |
 850                                                 UART_LSR_FE;
 851                 }
 852         }
 853         if (info->board->chip_flag) {
 854                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(info->tty));
 855                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(info->tty));
 856                 if (I_IXON(info->tty)) {
 857                         mxser_enable_must_rx_software_flow_control(
 858                                         info->ioaddr);
 859                 } else {
 860                         mxser_disable_must_rx_software_flow_control(
 861                                         info->ioaddr);
 862                 }
 863                 if (I_IXOFF(info->tty)) {
 864                         mxser_enable_must_tx_software_flow_control(
 865                                         info->ioaddr);
 866                 } else {
 867                         mxser_disable_must_tx_software_flow_control(
 868                                         info->ioaddr);
 869                 }
 870         }
 871
 872
 873         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 874         outb(cval, info->ioaddr + UART_LCR);
 875
 876         return ret;
 877 }
 878
 879 static void mxser_check_modem_status(struct mxser_port *port, int status)
 880 {
 881         /* update input line counters */
 882         if (status & UART_MSR_TERI)
 883                 port->icount.rng++;
 884         if (status & UART_MSR_DDSR)
 885                 port->icount.dsr++;
 886         if (status & UART_MSR_DDCD)
 887                 port->icount.dcd++;
 888         if (status & UART_MSR_DCTS)
 889                 port->icount.cts++;
 890         port->mon_data.modem_status = status;
 891         wake_up_interruptible(&port->delta_msr_wait);
 892
 893         if ((port->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 894                 if (status & UART_MSR_DCD)
 895                         wake_up_interruptible(&port->open_wait);
 896         }
 897
 898         if (port->flags & ASYNC_CTS_FLOW) {
 899                 if (port->tty->hw_stopped) {
 900                         if (status & UART_MSR_CTS) {
 901                                 port->tty->hw_stopped = 0;
 902
 903                                 if ((port->type != PORT_16550A) &&
 904                                                 (!port->board->chip_flag)) {
 905                                         outb(port->IER & ~UART_IER_THRI,
 906                                                 port->ioaddr + UART_IER);
 907                                         port->IER |= UART_IER_THRI;
 908                                         outb(port->IER, port->ioaddr +
 909                                                         UART_IER);
 910                                 }
 911                                 tty_wakeup(port->tty);
 912                         }
 913                 } else {
 914                         if (!(status & UART_MSR_CTS)) {
 915                                 port->tty->hw_stopped = 1;
 916                                 if (port->type != PORT_16550A &&
 917                                                 !port->board->chip_flag) {
 918                                         port->IER &= ~UART_IER_THRI;
 919                                         outb(port->IER, port->ioaddr +
 920                                                         UART_IER);
 921                                 }
 922                         }
 923                 }
 924         }
 925 }
 926
 927 static int mxser_startup(struct mxser_port *info)
 928 {
 929         unsigned long page;
 930         unsigned long flags;
 931
 932         page = __get_free_page(GFP_KERNEL);
 933         if (!page)
 934                 return -ENOMEM;
 935
 936         spin_lock_irqsave(&info->slock, flags);
 937
 938         if (info->flags & ASYNC_INITIALIZED) {
 939                 free_page(page);
 940                 spin_unlock_irqrestore(&info->slock, flags);
 941                 return 0;
 942         }
 943
 944         if (!info->ioaddr || !info->type) {
 945                 if (info->tty)
 946                         set_bit(TTY_IO_ERROR, &info->tty->flags);
 947                 free_page(page);
 948                 spin_unlock_irqrestore(&info->slock, flags);
 949                 return 0;
 950         }
 951         if (info->xmit_buf)
 952                 free_page(page);
 953         else
 954                 info->xmit_buf = (unsigned char *) page;
 955
 956         /*
 957          * Clear the FIFO buffers and disable them
 958          * (they will be reenabled in mxser_change_speed())
 959          */
 960         if (info->board->chip_flag)
 961                 outb((UART_FCR_CLEAR_RCVR |
 962                         UART_FCR_CLEAR_XMIT |
 963                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 964         else
 965                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 966                         info->ioaddr + UART_FCR);
 967
 968         /*
 969          * At this point there's no way the LSR could still be 0xFF;
 970          * if it is, then bail out, because there's likely no UART
 971          * here.
 972          */
 973         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 974                 spin_unlock_irqrestore(&info->slock, flags);
 975                 if (capable(CAP_SYS_ADMIN)) {
 976                         if (info->tty)
 977                                 set_bit(TTY_IO_ERROR, &info->tty->flags);
 978                         return 0;
 979                 } else
 980                         return -ENODEV;
 981         }
 982
 983         /*
 984          * Clear the interrupt registers.
 985          */
 986         (void) inb(info->ioaddr + UART_LSR);
 987         (void) inb(info->ioaddr + UART_RX);
 988         (void) inb(info->ioaddr + UART_IIR);
 989         (void) inb(info->ioaddr + UART_MSR);
 990
 991         /*
 992          * Now, initialize the UART
 993          */
 994         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 995         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 996         outb(info->MCR, info->ioaddr + UART_MCR);
 997
 998         /*
 999          * Finally, enable interrupts
1000          */
1001         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
1002
1003         if (info->board->chip_flag)
1004                 info->IER |= MOXA_MUST_IER_EGDAI;
1005         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
1006
1007         /*
1008          * And clear the interrupt registers again for luck.
1009          */
1010         (void) inb(info->ioaddr + UART_LSR);
1011         (void) inb(info->ioaddr + UART_RX);
1012         (void) inb(info->ioaddr + UART_IIR);
1013         (void) inb(info->ioaddr + UART_MSR);
1014
1015         if (info->tty)
1016                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1017         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1018
1019         /*
1020          * and set the speed of the serial port
1021          */
1022         mxser_change_speed(info, NULL);
1023         info->flags |= ASYNC_INITIALIZED;
1024         spin_unlock_irqrestore(&info->slock, flags);
1025
1026         return 0;
1027 }
1028
1029 /*
1030  * This routine will shutdown a serial port; interrupts maybe disabled, and
1031  * DTR is dropped if the hangup on close termio flag is on.
1032  */
1033 static void mxser_shutdown(struct mxser_port *info)
1034 {
1035         unsigned long flags;
1036
1037         if (!(info->flags & ASYNC_INITIALIZED))
1038                 return;
1039
1040         spin_lock_irqsave(&info->slock, flags);
1041
1042         /*
1043          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1044          * here so the queue might never be waken up
1045          */
1046         wake_up_interruptible(&info->delta_msr_wait);
1047
1048         /*
1049          * Free the IRQ, if necessary
1050          */
1051         if (info->xmit_buf) {
1052                 free_page((unsigned long) info->xmit_buf);
1053                 info->xmit_buf = NULL;
1054         }
1055
1056         info->IER = 0;
1057         outb(0x00, info->ioaddr + UART_IER);
1058
1059         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
1060                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1061         outb(info->MCR, info->ioaddr + UART_MCR);
1062
1063         /* clear Rx/Tx FIFO's */
1064         if (info->board->chip_flag)
1065                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1066                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1067                                 info->ioaddr + UART_FCR);
1068         else
1069                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1070                         info->ioaddr + UART_FCR);
1071
1072         /* read data port to reset things */
1073         (void) inb(info->ioaddr + UART_RX);
1074
1075         if (info->tty)
1076                 set_bit(TTY_IO_ERROR, &info->tty->flags);
1077
1078         info->flags &= ~ASYNC_INITIALIZED;
1079
1080         if (info->board->chip_flag)
1081                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1082
1083         spin_unlock_irqrestore(&info->slock, flags);
1084 }
1085
1086 /*
1087  * This routine is called whenever a serial port is opened.  It
1088  * enables interrupts for a serial port, linking in its async structure into
1089  * the IRQ chain.   It also performs the serial-specific
1090  * initialization for the tty structure.
1091  */
1092 static int mxser_open(struct tty_struct *tty, struct file *filp)
1093 {
1094         struct mxser_port *info;
1095         unsigned long flags;
1096         int retval, line;
1097
1098         line = tty->index;
1099         if (line == MXSER_PORTS)
1100                 return 0;
1101         if (line < 0 || line > MXSER_PORTS)
1102                 return -ENODEV;
1103         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1104         if (!info->ioaddr)
1105                 return -ENODEV;
1106
1107         tty->driver_data = info;
1108         info->tty = tty;
1109         /*
1110          * Start up serial port
1111          */
1112         spin_lock_irqsave(&info->slock, flags);
1113         info->count++;
1114         spin_unlock_irqrestore(&info->slock, flags);
1115         retval = mxser_startup(info);
1116         if (retval)
1117                 return retval;
1118
1119         retval = mxser_block_til_ready(tty, filp, info);
1120         if (retval)
1121                 return retval;
1122
1123         /* unmark here for very high baud rate (ex. 921600 bps) used */
1124         tty->low_latency = 1;
1125         return 0;
1126 }
1127
1128 static void mxser_flush_buffer(struct tty_struct *tty)
1129 {
1130         struct mxser_port *info = tty->driver_data;
1131         char fcr;
1132         unsigned long flags;
1133
1134
1135         spin_lock_irqsave(&info->slock, flags);
1136         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1137
1138         fcr = inb(info->ioaddr + UART_FCR);
1139         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1140                 info->ioaddr + UART_FCR);
1141         outb(fcr, info->ioaddr + UART_FCR);
1142
1143         spin_unlock_irqrestore(&info->slock, flags);
1144
1145         tty_wakeup(tty);
1146 }
1147
1148
1149 /*
1150  * This routine is called when the serial port gets closed.  First, we
1151  * wait for the last remaining data to be sent.  Then, we unlink its
1152  * async structure from the interrupt chain if necessary, and we free
1153  * that IRQ if nothing is left in the chain.
1154  */
1155 static void mxser_close(struct tty_struct *tty, struct file *filp)
1156 {
1157         struct mxser_port *info = tty->driver_data;
1158
1159         unsigned long timeout;
1160         unsigned long flags;
1161
1162         if (tty->index == MXSER_PORTS)
1163                 return;
1164         if (!info)
1165                 return;
1166
1167         spin_lock_irqsave(&info->slock, flags);
1168
1169         if (tty_hung_up_p(filp)) {
1170                 spin_unlock_irqrestore(&info->slock, flags);
1171                 return;
1172         }
1173         if ((tty->count == 1) && (info->count != 1)) {
1174                 /*
1175                  * Uh, oh.  tty->count is 1, which means that the tty
1176                  * structure will be freed.  Info->count should always
1177                  * be one in these conditions.  If it's greater than
1178                  * one, we've got real problems, since it means the
1179                  * serial port won't be shutdown.
1180                  */
1181                 printk(KERN_ERR "mxser_close: bad serial port count; "
1182                         "tty->count is 1, info->count is %d\n", info->count);
1183                 info->count = 1;
1184         }
1185         if (--info->count < 0) {
1186                 printk(KERN_ERR "mxser_close: bad serial port count for "
1187                         "ttys%d: %d\n", tty->index, info->count);
1188                 info->count = 0;
1189         }
1190         if (info->count) {
1191                 spin_unlock_irqrestore(&info->slock, flags);
1192                 return;
1193         }
1194         info->flags |= ASYNC_CLOSING;
1195         spin_unlock_irqrestore(&info->slock, flags);
1196         /*
1197          * Save the termios structure, since this port may have
1198          * separate termios for callout and dialin.
1199          */
1200         if (info->flags & ASYNC_NORMAL_ACTIVE)
1201                 info->normal_termios = *tty->termios;
1202         /*
1203          * Now we wait for the transmit buffer to clear; and we notify
1204          * the line discipline to only process XON/XOFF characters.
1205          */
1206         tty->closing = 1;
1207         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1208                 tty_wait_until_sent(tty, info->closing_wait);
1209         /*
1210          * At this point we stop accepting input.  To do this, we
1211          * disable the receive line status interrupts, and tell the
1212          * interrupt driver to stop checking the data ready bit in the
1213          * line status register.
1214          */
1215         info->IER &= ~UART_IER_RLSI;
1216         if (info->board->chip_flag)
1217                 info->IER &= ~MOXA_MUST_RECV_ISR;
1218
1219         if (info->flags & ASYNC_INITIALIZED) {
1220                 outb(info->IER, info->ioaddr + UART_IER);
1221                 /*
1222                  * Before we drop DTR, make sure the UART transmitter
1223                  * has completely drained; this is especially
1224                  * important if there is a transmit FIFO!
1225                  */
1226                 timeout = jiffies + HZ;
1227                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1228                         schedule_timeout_interruptible(5);
1229                         if (time_after(jiffies, timeout))
1230                                 break;
1231                 }
1232         }
1233         mxser_shutdown(info);
1234
1235         mxser_flush_buffer(tty);
1236         tty_ldisc_flush(tty);
1237
1238         tty->closing = 0;
1239         info->event = 0;
1240         info->tty = NULL;
1241         if (info->blocked_open) {
1242                 if (info->close_delay)
1243                         schedule_timeout_interruptible(info->close_delay);
1244                 wake_up_interruptible(&info->open_wait);
1245         }
1246
1247         info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1248 }
1249
1250 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1251 {
1252         int c, total = 0;
1253         struct mxser_port *info = tty->driver_data;
1254         unsigned long flags;
1255
1256         if (!info->xmit_buf)
1257                 return 0;
1258
1259         while (1) {
1260                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1261                                           SERIAL_XMIT_SIZE - info->xmit_head));
1262                 if (c <= 0)
1263                         break;
1264
1265                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1266                 spin_lock_irqsave(&info->slock, flags);
1267                 info->xmit_head = (info->xmit_head + c) &
1268                                   (SERIAL_XMIT_SIZE - 1);
1269                 info->xmit_cnt += c;
1270                 spin_unlock_irqrestore(&info->slock, flags);
1271
1272                 buf += c;
1273                 count -= c;
1274                 total += c;
1275         }
1276
1277         if (info->xmit_cnt && !tty->stopped) {
1278                 if (!tty->hw_stopped ||
1279                                 (info->type == PORT_16550A) ||
1280                                 (info->board->chip_flag)) {
1281                         spin_lock_irqsave(&info->slock, flags);
1282                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1283                                         UART_IER);
1284                         info->IER |= UART_IER_THRI;
1285                         outb(info->IER, info->ioaddr + UART_IER);
1286                         spin_unlock_irqrestore(&info->slock, flags);
1287                 }
1288         }
1289         return total;
1290 }
1291
1292 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1293 {
1294         struct mxser_port *info = tty->driver_data;
1295         unsigned long flags;
1296
1297         if (!info->xmit_buf)
1298                 return 0;
1299
1300         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1301                 return 0;
1302
1303         spin_lock_irqsave(&info->slock, flags);
1304         info->xmit_buf[info->xmit_head++] = ch;
1305         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1306         info->xmit_cnt++;
1307         spin_unlock_irqrestore(&info->slock, flags);
1308         if (!tty->stopped) {
1309                 if (!tty->hw_stopped ||
1310                                 (info->type == PORT_16550A) ||
1311                                 info->board->chip_flag) {
1312                         spin_lock_irqsave(&info->slock, flags);
1313                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1314                         info->IER |= UART_IER_THRI;
1315                         outb(info->IER, info->ioaddr + UART_IER);
1316                         spin_unlock_irqrestore(&info->slock, flags);
1317                 }
1318         }
1319         return 1;
1320 }
1321
1322
1323 static void mxser_flush_chars(struct tty_struct *tty)
1324 {
1325         struct mxser_port *info = tty->driver_data;
1326         unsigned long flags;
1327
1328         if (info->xmit_cnt <= 0 ||
1329                         tty->stopped ||
1330                         !info->xmit_buf ||
1331                         (tty->hw_stopped &&
1332                          (info->type != PORT_16550A) &&
1333                          (!info->board->chip_flag)
1334                         ))
1335                 return;
1336
1337         spin_lock_irqsave(&info->slock, flags);
1338
1339         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1340         info->IER |= UART_IER_THRI;
1341         outb(info->IER, info->ioaddr + UART_IER);
1342
1343         spin_unlock_irqrestore(&info->slock, flags);
1344 }
1345
1346 static int mxser_write_room(struct tty_struct *tty)
1347 {
1348         struct mxser_port *info = tty->driver_data;
1349         int ret;
1350
1351         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1352         if (ret < 0)
1353                 ret = 0;
1354         return ret;
1355 }
1356
1357 static int mxser_chars_in_buffer(struct tty_struct *tty)
1358 {
1359         struct mxser_port *info = tty->driver_data;
1360         return info->xmit_cnt;
1361 }
1362
1363 /*
1364  * ------------------------------------------------------------
1365  * friends of mxser_ioctl()
1366  * ------------------------------------------------------------
1367  */
1368 static int mxser_get_serial_info(struct mxser_port *info,
1369                 struct serial_struct __user *retinfo)
1370 {
1371         struct serial_struct tmp = {
1372                 .type = info->type,
1373                 .line = info->tty->index,
1374                 .port = info->ioaddr,
1375                 .irq = info->board->irq,
1376                 .flags = info->flags,
1377                 .baud_base = info->baud_base,
1378                 .close_delay = info->close_delay,
1379                 .closing_wait = info->closing_wait,
1380                 .custom_divisor = info->custom_divisor,
1381                 .hub6 = 0
1382         };
1383         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1384                 return -EFAULT;
1385         return 0;
1386 }
1387
1388 static int mxser_set_serial_info(struct mxser_port *info,
1389                 struct serial_struct __user *new_info)
1390 {
1391         struct serial_struct new_serial;
1392         speed_t baud;
1393         unsigned long sl_flags;
1394         unsigned int flags;
1395         int retval = 0;
1396
1397         if (!new_info || !info->ioaddr)
1398                 return -ENODEV;
1399         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1400                 return -EFAULT;
1401
1402         if (new_serial.irq != info->board->irq ||
1403                         new_serial.port != info->ioaddr)
1404                 return -EINVAL;
1405
1406         flags = info->flags & ASYNC_SPD_MASK;
1407
1408         if (!capable(CAP_SYS_ADMIN)) {
1409                 if ((new_serial.baud_base != info->baud_base) ||
1410                                 (new_serial.close_delay != info->close_delay) ||
1411                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK)))
1412                         return -EPERM;
1413                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1414                                 (new_serial.flags & ASYNC_USR_MASK));
1415         } else {
1416                 /*
1417                  * OK, past this point, all the error checking has been done.
1418                  * At this point, we start making changes.....
1419                  */
1420                 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1421                                 (new_serial.flags & ASYNC_FLAGS));
1422                 info->close_delay = new_serial.close_delay * HZ / 100;
1423                 info->closing_wait = new_serial.closing_wait * HZ / 100;
1424                 info->tty->low_latency =
1425                                 (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1426                 info->tty->low_latency = 0;
1427                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1428                                 (new_serial.baud_base != info->baud_base ||
1429                                 new_serial.custom_divisor !=
1430                                 info->custom_divisor)) {
1431                         baud = new_serial.baud_base / new_serial.custom_divisor;
1432                         tty_encode_baud_rate(info->tty, baud, baud);
1433                 }
1434         }
1435
1436         info->type = new_serial.type;
1437
1438         process_txrx_fifo(info);
1439
1440         if (info->flags & ASYNC_INITIALIZED) {
1441                 if (flags != (info->flags & ASYNC_SPD_MASK)) {
1442                         spin_lock_irqsave(&info->slock, sl_flags);
1443                         mxser_change_speed(info, NULL);
1444                         spin_unlock_irqrestore(&info->slock, sl_flags);
1445                 }
1446         } else
1447                 retval = mxser_startup(info);
1448
1449         return retval;
1450 }
1451
1452 /*
1453  * mxser_get_lsr_info - get line status register info
1454  *
1455  * Purpose: Let user call ioctl() to get info when the UART physically
1456  *          is emptied.  On bus types like RS485, the transmitter must
1457  *          release the bus after transmitting. This must be done when
1458  *          the transmit shift register is empty, not be done when the
1459  *          transmit holding register is empty.  This functionality
1460  *          allows an RS485 driver to be written in user space.
1461  */
1462 static int mxser_get_lsr_info(struct mxser_port *info,
1463                 unsigned int __user *value)
1464 {
1465         unsigned char status;
1466         unsigned int result;
1467         unsigned long flags;
1468
1469         spin_lock_irqsave(&info->slock, flags);
1470         status = inb(info->ioaddr + UART_LSR);
1471         spin_unlock_irqrestore(&info->slock, flags);
1472         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1473         return put_user(result, value);
1474 }
1475
1476 /*
1477  * This routine sends a break character out the serial port.
1478  */
1479 static void mxser_send_break(struct mxser_port *info, int duration)
1480 {
1481         unsigned long flags;
1482
1483         if (!info->ioaddr)
1484                 return;
1485         set_current_state(TASK_INTERRUPTIBLE);
1486         spin_lock_irqsave(&info->slock, flags);
1487         outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
1488                 info->ioaddr + UART_LCR);
1489         spin_unlock_irqrestore(&info->slock, flags);
1490         schedule_timeout(duration);
1491         spin_lock_irqsave(&info->slock, flags);
1492         outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
1493                 info->ioaddr + UART_LCR);
1494         spin_unlock_irqrestore(&info->slock, flags);
1495 }
1496
1497 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1498 {
1499         struct mxser_port *info = tty->driver_data;
1500         unsigned char control, status;
1501         unsigned long flags;
1502
1503
1504         if (tty->index == MXSER_PORTS)
1505                 return -ENOIOCTLCMD;
1506         if (test_bit(TTY_IO_ERROR, &tty->flags))
1507                 return -EIO;
1508
1509         control = info->MCR;
1510
1511         spin_lock_irqsave(&info->slock, flags);
1512         status = inb(info->ioaddr + UART_MSR);
1513         if (status & UART_MSR_ANY_DELTA)
1514                 mxser_check_modem_status(info, status);
1515         spin_unlock_irqrestore(&info->slock, flags);
1516         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1517                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1518                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1519                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1520                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1521                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1522 }
1523
1524 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1525                 unsigned int set, unsigned int clear)
1526 {
1527         struct mxser_port *info = tty->driver_data;
1528         unsigned long flags;
1529
1530
1531         if (tty->index == MXSER_PORTS)
1532                 return -ENOIOCTLCMD;
1533         if (test_bit(TTY_IO_ERROR, &tty->flags))
1534                 return -EIO;
1535
1536         spin_lock_irqsave(&info->slock, flags);
1537
1538         if (set & TIOCM_RTS)
1539                 info->MCR |= UART_MCR_RTS;
1540         if (set & TIOCM_DTR)
1541                 info->MCR |= UART_MCR_DTR;
1542
1543         if (clear & TIOCM_RTS)
1544                 info->MCR &= ~UART_MCR_RTS;
1545         if (clear & TIOCM_DTR)
1546                 info->MCR &= ~UART_MCR_DTR;
1547
1548         outb(info->MCR, info->ioaddr + UART_MCR);
1549         spin_unlock_irqrestore(&info->slock, flags);
1550         return 0;
1551 }
1552
1553 static int __init mxser_program_mode(int port)
1554 {
1555         int id, i, j, n;
1556
1557         outb(0, port);
1558         outb(0, port);
1559         outb(0, port);
1560         (void)inb(port);
1561         (void)inb(port);
1562         outb(0, port);
1563         (void)inb(port);
1564
1565         id = inb(port + 1) & 0x1F;
1566         if ((id != C168_ASIC_ID) &&
1567                         (id != C104_ASIC_ID) &&
1568                         (id != C102_ASIC_ID) &&
1569                         (id != CI132_ASIC_ID) &&
1570                         (id != CI134_ASIC_ID) &&
1571                         (id != CI104J_ASIC_ID))
1572                 return -1;
1573         for (i = 0, j = 0; i < 4; i++) {
1574                 n = inb(port + 2);
1575                 if (n == 'M') {
1576                         j = 1;
1577                 } else if ((j == 1) && (n == 1)) {
1578                         j = 2;
1579                         break;
1580                 } else
1581                         j = 0;
1582         }
1583         if (j != 2)
1584                 id = -2;
1585         return id;
1586 }
1587
1588 static void __init mxser_normal_mode(int port)
1589 {
1590         int i, n;
1591
1592         outb(0xA5, port + 1);
1593         outb(0x80, port + 3);
1594         outb(12, port + 0);     /* 9600 bps */
1595         outb(0, port + 1);
1596         outb(0x03, port + 3);   /* 8 data bits */
1597         outb(0x13, port + 4);   /* loop back mode */
1598         for (i = 0; i < 16; i++) {
1599                 n = inb(port + 5);
1600                 if ((n & 0x61) == 0x60)
1601                         break;
1602                 if ((n & 1) == 1)
1603                         (void)inb(port);
1604         }
1605         outb(0x00, port + 4);
1606 }
1607
1608 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1609 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1610 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1611 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1612 #define EN_CCMD         0x000   /* Chip's command register     */
1613 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1614 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1615 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1616 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1617 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1618 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1619 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1620 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1621 static int __init mxser_read_register(int port, unsigned short *regs)
1622 {
1623         int i, k, value, id;
1624         unsigned int j;
1625
1626         id = mxser_program_mode(port);
1627         if (id < 0)
1628                 return id;
1629         for (i = 0; i < 14; i++) {
1630                 k = (i & 0x3F) | 0x180;
1631                 for (j = 0x100; j > 0; j >>= 1) {
1632                         outb(CHIP_CS, port);
1633                         if (k & j) {
1634                                 outb(CHIP_CS | CHIP_DO, port);
1635                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1636                         } else {
1637                                 outb(CHIP_CS, port);
1638                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1639                         }
1640                 }
1641                 (void)inb(port);
1642                 value = 0;
1643                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1644                         outb(CHIP_CS, port);
1645                         outb(CHIP_CS | CHIP_SK, port);
1646                         if (inb(port) & CHIP_DI)
1647                                 value |= j;
1648                 }
1649                 regs[i] = value;
1650                 outb(0, port);
1651         }
1652         mxser_normal_mode(port);
1653         return id;
1654 }
1655
1656 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1657 {
1658         struct mxser_port *port;
1659         int result, status;
1660         unsigned int i, j;
1661         int ret = 0;
1662
1663         switch (cmd) {
1664         case MOXA_GET_MAJOR:
1665                 return put_user(ttymajor, (int __user *)argp);
1666
1667         case MOXA_CHKPORTENABLE:
1668                 result = 0;
1669                 lock_kernel();
1670                 for (i = 0; i < MXSER_BOARDS; i++)
1671                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1672                                 if (mxser_boards[i].ports[j].ioaddr)
1673                                         result |= (1 << i);
1674                 unlock_kernel();
1675                 return put_user(result, (unsigned long __user *)argp);
1676         case MOXA_GETDATACOUNT:
1677                 lock_kernel();
1678                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1679                         ret = -EFAULT;
1680                 unlock_kernel();
1681                 return ret;
1682         case MOXA_GETMSTATUS:
1683                 lock_kernel();
1684                 for (i = 0; i < MXSER_BOARDS; i++)
1685                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1686                                 port = &mxser_boards[i].ports[j];
1687
1688                                 GMStatus[i].ri = 0;
1689                                 if (!port->ioaddr) {
1690                                         GMStatus[i].dcd = 0;
1691                                         GMStatus[i].dsr = 0;
1692                                         GMStatus[i].cts = 0;
1693                                         continue;
1694                                 }
1695
1696                                 if (!port->tty || !port->tty->termios)
1697                                         GMStatus[i].cflag =
1698                                                 port->normal_termios.c_cflag;
1699                                 else
1700                                         GMStatus[i].cflag =
1701                                                 port->tty->termios->c_cflag;
1702
1703                                 status = inb(port->ioaddr + UART_MSR);
1704                                 if (status & 0x80 /*UART_MSR_DCD */ )
1705                                         GMStatus[i].dcd = 1;
1706                                 else
1707                                         GMStatus[i].dcd = 0;
1708
1709                                 if (status & 0x20 /*UART_MSR_DSR */ )
1710                                         GMStatus[i].dsr = 1;
1711                                 else
1712                                         GMStatus[i].dsr = 0;
1713
1714
1715                                 if (status & 0x10 /*UART_MSR_CTS */ )
1716                                         GMStatus[i].cts = 1;
1717                                 else
1718                                         GMStatus[i].cts = 0;
1719                         }
1720                 unlock_kernel();
1721                 if (copy_to_user(argp, GMStatus,
1722                                 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1723                         return -EFAULT;
1724                 return 0;
1725         case MOXA_ASPP_MON_EXT: {
1726                 int p, shiftbit;
1727                 unsigned long opmode;
1728                 unsigned cflag, iflag;
1729
1730                 lock_kernel();
1731                 for (i = 0; i < MXSER_BOARDS; i++) {
1732                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1733                                 port = &mxser_boards[i].ports[j];
1734                                 if (!port->ioaddr)
1735                                         continue;
1736
1737                                 status = mxser_get_msr(port->ioaddr, 0, i);
1738
1739                                 if (status & UART_MSR_TERI)
1740                                         port->icount.rng++;
1741                                 if (status & UART_MSR_DDSR)
1742                                         port->icount.dsr++;
1743                                 if (status & UART_MSR_DDCD)
1744                                         port->icount.dcd++;
1745                                 if (status & UART_MSR_DCTS)
1746                                         port->icount.cts++;
1747
1748                                 port->mon_data.modem_status = status;
1749                                 mon_data_ext.rx_cnt[i] = port->mon_data.rxcnt;
1750                                 mon_data_ext.tx_cnt[i] = port->mon_data.txcnt;
1751                                 mon_data_ext.up_rxcnt[i] =
1752                                         port->mon_data.up_rxcnt;
1753                                 mon_data_ext.up_txcnt[i] =
1754                                         port->mon_data.up_txcnt;
1755                                 mon_data_ext.modem_status[i] =
1756                                         port->mon_data.modem_status;
1757                                 mon_data_ext.baudrate[i] =
1758                                         tty_get_baud_rate(port->tty);
1759
1760                                 if (!port->tty || !port->tty->termios) {
1761                                         cflag = port->normal_termios.c_cflag;
1762                                         iflag = port->normal_termios.c_iflag;
1763                                 } else {
1764                                         cflag = port->tty->termios->c_cflag;
1765                                         iflag = port->tty->termios->c_iflag;
1766                                 }
1767
1768                                 mon_data_ext.databits[i] = cflag & CSIZE;
1769
1770                                 mon_data_ext.stopbits[i] = cflag & CSTOPB;
1771
1772                                 mon_data_ext.parity[i] =
1773                                         cflag & (PARENB | PARODD | CMSPAR);
1774
1775                                 mon_data_ext.flowctrl[i] = 0x00;
1776
1777                                 if (cflag & CRTSCTS)
1778                                         mon_data_ext.flowctrl[i] |= 0x03;
1779
1780                                 if (iflag & (IXON | IXOFF))
1781                                         mon_data_ext.flowctrl[i] |= 0x0C;
1782
1783                                 if (port->type == PORT_16550A)
1784                                         mon_data_ext.fifo[i] = 1;
1785                                 else
1786                                         mon_data_ext.fifo[i] = 0;
1787
1788                                 p = i % 4;
1789                                 shiftbit = p * 2;
1790                                 opmode = inb(port->opmode_ioaddr) >> shiftbit;
1791                                 opmode &= OP_MODE_MASK;
1792
1793                                 mon_data_ext.iftype[i] = opmode;
1794
1795                         }
1796                 }
1797                 unlock_kernel();
1798                 if (copy_to_user(argp, &mon_data_ext,
1799                                         sizeof(mon_data_ext)))
1800                         return -EFAULT;
1801                 return 0;
1802         }
1803         default:
1804                 return -ENOIOCTLCMD;
1805         }
1806         return 0;
1807 }
1808
1809 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1810                 struct async_icount *cprev)
1811 {
1812         struct async_icount cnow;
1813         unsigned long flags;
1814         int ret;
1815
1816         spin_lock_irqsave(&info->slock, flags);
1817         cnow = info->icount;    /* atomic copy */
1818         spin_unlock_irqrestore(&info->slock, flags);
1819
1820         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1821                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1822                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1823                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1824
1825         *cprev = cnow;
1826
1827         return ret;
1828 }
1829
1830 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1831                 unsigned int cmd, unsigned long arg)
1832 {
1833         struct mxser_port *info = tty->driver_data;
1834         struct async_icount cnow;
1835         struct serial_icounter_struct __user *p_cuser;
1836         unsigned long flags;
1837         void __user *argp = (void __user *)arg;
1838         int retval;
1839
1840         if (tty->index == MXSER_PORTS)
1841                 return mxser_ioctl_special(cmd, argp);
1842
1843         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1844                 int p;
1845                 unsigned long opmode;
1846                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1847                 int shiftbit;
1848                 unsigned char val, mask;
1849
1850                 p = tty->index % 4;
1851                 if (cmd == MOXA_SET_OP_MODE) {
1852                         if (get_user(opmode, (int __user *) argp))
1853                                 return -EFAULT;
1854                         if (opmode != RS232_MODE &&
1855                                         opmode != RS485_2WIRE_MODE &&
1856                                         opmode != RS422_MODE &&
1857                                         opmode != RS485_4WIRE_MODE)
1858                                 return -EFAULT;
1859                         lock_kernel();
1860                         mask = ModeMask[p];
1861                         shiftbit = p * 2;
1862                         val = inb(info->opmode_ioaddr);
1863                         val &= mask;
1864                         val |= (opmode << shiftbit);
1865                         outb(val, info->opmode_ioaddr);
1866                         unlock_kernel();
1867                 } else {
1868                         lock_kernel();
1869                         shiftbit = p * 2;
1870                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1871                         opmode &= OP_MODE_MASK;
1872                         unlock_kernel();
1873                         if (put_user(opmode, (int __user *)argp))
1874                                 return -EFAULT;
1875                 }
1876                 return 0;
1877         }
1878
1879         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1880                         test_bit(TTY_IO_ERROR, &tty->flags))
1881                 return -EIO;
1882
1883         switch (cmd) {
1884         case TCSBRK:            /* SVID version: non-zero arg --> no break */
1885                 retval = tty_check_change(tty);
1886                 if (retval)
1887                         return retval;
1888                 tty_wait_until_sent(tty, 0);
1889                 if (!arg)
1890                         mxser_send_break(info, HZ / 4); /* 1/4 second */
1891                 return 0;
1892         case TCSBRKP:           /* support for POSIX tcsendbreak() */
1893                 retval = tty_check_change(tty);
1894                 if (retval)
1895                         return retval;
1896                 tty_wait_until_sent(tty, 0);
1897                 mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1898                 return 0;
1899         case TIOCGSERIAL:
1900                 lock_kernel();
1901                 retval = mxser_get_serial_info(info, argp);
1902                 unlock_kernel();
1903                 return retval;
1904         case TIOCSSERIAL:
1905                 lock_kernel();
1906                 retval = mxser_set_serial_info(info, argp);
1907                 unlock_kernel();
1908                 return retval;
1909         case TIOCSERGETLSR:     /* Get line status register */
1910                 return  mxser_get_lsr_info(info, argp);
1911                 /*
1912                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1913                  * - mask passed in arg for lines of interest
1914                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1915                  * Caller should use TIOCGICOUNT to see which one it was
1916                  */
1917         case TIOCMIWAIT:
1918                 spin_lock_irqsave(&info->slock, flags);
1919                 cnow = info->icount;    /* note the counters on entry */
1920                 spin_unlock_irqrestore(&info->slock, flags);
1921
1922                 return wait_event_interruptible(info->delta_msr_wait,
1923                                 mxser_cflags_changed(info, arg, &cnow));
1924         /*
1925          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1926          * Return: write counters to the user passed counter struct
1927          * NB: both 1->0 and 0->1 transitions are counted except for
1928          *     RI where only 0->1 is counted.
1929          */
1930         case TIOCGICOUNT:
1931                 spin_lock_irqsave(&info->slock, flags);
1932                 cnow = info->icount;
1933                 spin_unlock_irqrestore(&info->slock, flags);
1934                 p_cuser = argp;
1935                 if (put_user(cnow.frame, &p_cuser->frame))
1936                         return -EFAULT;
1937                 if (put_user(cnow.brk, &p_cuser->brk))
1938                         return -EFAULT;
1939                 if (put_user(cnow.overrun, &p_cuser->overrun))
1940                         return -EFAULT;
1941                 if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1942                         return -EFAULT;
1943                 if (put_user(cnow.parity, &p_cuser->parity))
1944                         return -EFAULT;
1945                 if (put_user(cnow.rx, &p_cuser->rx))
1946                         return -EFAULT;
1947                 if (put_user(cnow.tx, &p_cuser->tx))
1948                         return -EFAULT;
1949                 put_user(cnow.cts, &p_cuser->cts);
1950                 put_user(cnow.dsr, &p_cuser->dsr);
1951                 put_user(cnow.rng, &p_cuser->rng);
1952                 put_user(cnow.dcd, &p_cuser->dcd);
1953                 return 0;
1954         case MOXA_HighSpeedOn:
1955                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1956         case MOXA_SDS_RSTICOUNTER:
1957                 lock_kernel();
1958                 info->mon_data.rxcnt = 0;
1959                 info->mon_data.txcnt = 0;
1960                 unlock_kernel();
1961                 return 0;
1962
1963         case MOXA_ASPP_OQUEUE:{
1964                 int len, lsr;
1965
1966                 lock_kernel();
1967                 len = mxser_chars_in_buffer(tty);
1968                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1969                 len += (lsr ? 0 : 1);
1970                 unlock_kernel();
1971
1972                 return put_user(len, (int __user *)argp);
1973         }
1974         case MOXA_ASPP_MON: {
1975                 int mcr, status;
1976
1977                 lock_kernel();
1978                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1979                 mxser_check_modem_status(info, status);
1980
1981                 mcr = inb(info->ioaddr + UART_MCR);
1982                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1983                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1984                 else
1985                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1986
1987                 if (mcr & MOXA_MUST_MCR_TX_XON)
1988                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1989                 else
1990                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1991
1992                 if (info->tty->hw_stopped)
1993                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1994                 else
1995                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1996                 unlock_kernel();
1997                 if (copy_to_user(argp, &info->mon_data,
1998                                 sizeof(struct mxser_mon)))
1999                         return -EFAULT;
2000
2001                 return 0;
2002         }
2003         case MOXA_ASPP_LSTATUS: {
2004                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
2005                         return -EFAULT;
2006
2007                 info->err_shadow = 0;
2008                 return 0;
2009         }
2010         case MOXA_SET_BAUD_METHOD: {
2011                 int method;
2012
2013                 if (get_user(method, (int __user *)argp))
2014                         return -EFAULT;
2015                 mxser_set_baud_method[tty->index] = method;
2016                 return put_user(method, (int __user *)argp);
2017         }
2018         default:
2019                 return -ENOIOCTLCMD;
2020         }
2021         return 0;
2022 }
2023
2024 static void mxser_stoprx(struct tty_struct *tty)
2025 {
2026         struct mxser_port *info = tty->driver_data;
2027
2028         info->ldisc_stop_rx = 1;
2029         if (I_IXOFF(tty)) {
2030                 if (info->board->chip_flag) {
2031                         info->IER &= ~MOXA_MUST_RECV_ISR;
2032                         outb(info->IER, info->ioaddr + UART_IER);
2033                 } else {
2034                         info->x_char = STOP_CHAR(tty);
2035                         outb(0, info->ioaddr + UART_IER);
2036                         info->IER |= UART_IER_THRI;
2037                         outb(info->IER, info->ioaddr + UART_IER);
2038                 }
2039         }
2040
2041         if (info->tty->termios->c_cflag & CRTSCTS) {
2042                 info->MCR &= ~UART_MCR_RTS;
2043                 outb(info->MCR, info->ioaddr + UART_MCR);
2044         }
2045 }
2046
2047 /*
2048  * This routine is called by the upper-layer tty layer to signal that
2049  * incoming characters should be throttled.
2050  */
2051 static void mxser_throttle(struct tty_struct *tty)
2052 {
2053         mxser_stoprx(tty);
2054 }
2055
2056 static void mxser_unthrottle(struct tty_struct *tty)
2057 {
2058         struct mxser_port *info = tty->driver_data;
2059
2060         /* startrx */
2061         info->ldisc_stop_rx = 0;
2062         if (I_IXOFF(tty)) {
2063                 if (info->x_char)
2064                         info->x_char = 0;
2065                 else {
2066                         if (info->board->chip_flag) {
2067                                 info->IER |= MOXA_MUST_RECV_ISR;
2068                                 outb(info->IER, info->ioaddr + UART_IER);
2069                         } else {
2070                                 info->x_char = START_CHAR(tty);
2071                                 outb(0, info->ioaddr + UART_IER);
2072                                 info->IER |= UART_IER_THRI;
2073                                 outb(info->IER, info->ioaddr + UART_IER);
2074                         }
2075                 }
2076         }
2077
2078         if (info->tty->termios->c_cflag & CRTSCTS) {
2079                 info->MCR |= UART_MCR_RTS;
2080                 outb(info->MCR, info->ioaddr + UART_MCR);
2081         }
2082 }
2083
2084 /*
2085  * mxser_stop() and mxser_start()
2086  *
2087  * This routines are called before setting or resetting tty->stopped.
2088  * They enable or disable transmitter interrupts, as necessary.
2089  */
2090 static void mxser_stop(struct tty_struct *tty)
2091 {
2092         struct mxser_port *info = tty->driver_data;
2093         unsigned long flags;
2094
2095         spin_lock_irqsave(&info->slock, flags);
2096         if (info->IER & UART_IER_THRI) {
2097                 info->IER &= ~UART_IER_THRI;
2098                 outb(info->IER, info->ioaddr + UART_IER);
2099         }
2100         spin_unlock_irqrestore(&info->slock, flags);
2101 }
2102
2103 static void mxser_start(struct tty_struct *tty)
2104 {
2105         struct mxser_port *info = tty->driver_data;
2106         unsigned long flags;
2107
2108         spin_lock_irqsave(&info->slock, flags);
2109         if (info->xmit_cnt && info->xmit_buf) {
2110                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2111                 info->IER |= UART_IER_THRI;
2112                 outb(info->IER, info->ioaddr + UART_IER);
2113         }
2114         spin_unlock_irqrestore(&info->slock, flags);
2115 }
2116
2117 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2118 {
2119         struct mxser_port *info = tty->driver_data;
2120         unsigned long flags;
2121
2122         spin_lock_irqsave(&info->slock, flags);
2123         mxser_change_speed(info, old_termios);
2124         spin_unlock_irqrestore(&info->slock, flags);
2125
2126         if ((old_termios->c_cflag & CRTSCTS) &&
2127                         !(tty->termios->c_cflag & CRTSCTS)) {
2128                 tty->hw_stopped = 0;
2129                 mxser_start(tty);
2130         }
2131
2132         /* Handle sw stopped */
2133         if ((old_termios->c_iflag & IXON) &&
2134                         !(tty->termios->c_iflag & IXON)) {
2135                 tty->stopped = 0;
2136
2137                 if (info->board->chip_flag) {
2138                         spin_lock_irqsave(&info->slock, flags);
2139                         mxser_disable_must_rx_software_flow_control(
2140                                         info->ioaddr);
2141                         spin_unlock_irqrestore(&info->slock, flags);
2142                 }
2143
2144                 mxser_start(tty);
2145         }
2146 }
2147
2148 /*
2149  * mxser_wait_until_sent() --- wait until the transmitter is empty
2150  */
2151 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2152 {
2153         struct mxser_port *info = tty->driver_data;
2154         unsigned long orig_jiffies, char_time;
2155         int lsr;
2156
2157         if (info->type == PORT_UNKNOWN)
2158                 return;
2159
2160         if (info->xmit_fifo_size == 0)
2161                 return;         /* Just in case.... */
2162
2163         orig_jiffies = jiffies;
2164         /*
2165          * Set the check interval to be 1/5 of the estimated time to
2166          * send a single character, and make it at least 1.  The check
2167          * interval should also be less than the timeout.
2168          *
2169          * Note: we have to use pretty tight timings here to satisfy
2170          * the NIST-PCTS.
2171          */
2172         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2173         char_time = char_time / 5;
2174         if (char_time == 0)
2175                 char_time = 1;
2176         if (timeout && timeout < char_time)
2177                 char_time = timeout;
2178         /*
2179          * If the transmitter hasn't cleared in twice the approximate
2180          * amount of time to send the entire FIFO, it probably won't
2181          * ever clear.  This assumes the UART isn't doing flow
2182          * control, which is currently the case.  Hence, if it ever
2183          * takes longer than info->timeout, this is probably due to a
2184          * UART bug of some kind.  So, we clamp the timeout parameter at
2185          * 2*info->timeout.
2186          */
2187         if (!timeout || timeout > 2 * info->timeout)
2188                 timeout = 2 * info->timeout;
2189 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2190         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2191                 timeout, char_time);
2192         printk("jiff=%lu...", jiffies);
2193 #endif
2194         lock_kernel();
2195         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2196 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2197                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2198 #endif
2199                 schedule_timeout_interruptible(char_time);
2200                 if (signal_pending(current))
2201                         break;
2202                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2203                         break;
2204         }
2205         set_current_state(TASK_RUNNING);
2206         unlock_kernel();
2207
2208 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2209         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2210 #endif
2211 }
2212
2213 /*
2214  * This routine is called by tty_hangup() when a hangup is signaled.
2215  */
2216 static void mxser_hangup(struct tty_struct *tty)
2217 {
2218         struct mxser_port *info = tty->driver_data;
2219
2220         mxser_flush_buffer(tty);
2221         mxser_shutdown(info);
2222         info->event = 0;
2223         info->count = 0;
2224         info->flags &= ~ASYNC_NORMAL_ACTIVE;
2225         info->tty = NULL;
2226         wake_up_interruptible(&info->open_wait);
2227 }
2228
2229 /*
2230  * mxser_rs_break() --- routine which turns the break handling on or off
2231  */
2232 static void mxser_rs_break(struct tty_struct *tty, int break_state)
2233 {
2234         struct mxser_port *info = tty->driver_data;
2235         unsigned long flags;
2236
2237         spin_lock_irqsave(&info->slock, flags);
2238         if (break_state == -1)
2239                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2240                         info->ioaddr + UART_LCR);
2241         else
2242                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2243                         info->ioaddr + UART_LCR);
2244         spin_unlock_irqrestore(&info->slock, flags);
2245 }
2246
2247 static void mxser_receive_chars(struct mxser_port *port, int *status)
2248 {
2249         struct tty_struct *tty = port->tty;
2250         unsigned char ch, gdl;
2251         int ignored = 0;
2252         int cnt = 0;
2253         int recv_room;
2254         int max = 256;
2255
2256         recv_room = tty->receive_room;
2257         if ((recv_room == 0) && (!port->ldisc_stop_rx))
2258                 mxser_stoprx(tty);
2259
2260         if (port->board->chip_flag != MOXA_OTHER_UART) {
2261
2262                 if (*status & UART_LSR_SPECIAL)
2263                         goto intr_old;
2264                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2265                                 (*status & MOXA_MUST_LSR_RERR))
2266                         goto intr_old;
2267                 if (*status & MOXA_MUST_LSR_RERR)
2268                         goto intr_old;
2269
2270                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2271
2272                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2273                         gdl &= MOXA_MUST_GDL_MASK;
2274                 if (gdl >= recv_room) {
2275                         if (!port->ldisc_stop_rx)
2276                                 mxser_stoprx(tty);
2277                 }
2278                 while (gdl--) {
2279                         ch = inb(port->ioaddr + UART_RX);
2280                         tty_insert_flip_char(tty, ch, 0);
2281                         cnt++;
2282                 }
2283                 goto end_intr;
2284         }
2285 intr_old:
2286
2287         do {
2288                 if (max-- < 0)
2289                         break;
2290
2291                 ch = inb(port->ioaddr + UART_RX);
2292                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2293                         outb(0x23, port->ioaddr + UART_FCR);
2294                 *status &= port->read_status_mask;
2295                 if (*status & port->ignore_status_mask) {
2296                         if (++ignored > 100)
2297                                 break;
2298                 } else {
2299                         char flag = 0;
2300                         if (*status & UART_LSR_SPECIAL) {
2301                                 if (*status & UART_LSR_BI) {
2302                                         flag = TTY_BREAK;
2303                                         port->icount.brk++;
2304
2305                                         if (port->flags & ASYNC_SAK)
2306                                                 do_SAK(tty);
2307                                 } else if (*status & UART_LSR_PE) {
2308                                         flag = TTY_PARITY;
2309                                         port->icount.parity++;
2310                                 } else if (*status & UART_LSR_FE) {
2311                                         flag = TTY_FRAME;
2312                                         port->icount.frame++;
2313                                 } else if (*status & UART_LSR_OE) {
2314                                         flag = TTY_OVERRUN;
2315                                         port->icount.overrun++;
2316                                 } else
2317                                         flag = TTY_BREAK;
2318                         }
2319                         tty_insert_flip_char(tty, ch, flag);
2320                         cnt++;
2321                         if (cnt >= recv_room) {
2322                                 if (!port->ldisc_stop_rx)
2323                                         mxser_stoprx(tty);
2324                                 break;
2325                         }
2326
2327                 }
2328
2329                 if (port->board->chip_flag)
2330                         break;
2331
2332                 *status = inb(port->ioaddr + UART_LSR);
2333         } while (*status & UART_LSR_DR);
2334
2335 end_intr:
2336         mxvar_log.rxcnt[port->tty->index] += cnt;
2337         port->mon_data.rxcnt += cnt;
2338         port->mon_data.up_rxcnt += cnt;
2339
2340         /*
2341          * We are called from an interrupt context with &port->slock
2342          * being held. Drop it temporarily in order to prevent
2343          * recursive locking.
2344          */
2345         spin_unlock(&port->slock);
2346         tty_flip_buffer_push(tty);
2347         spin_lock(&port->slock);
2348 }
2349
2350 static void mxser_transmit_chars(struct mxser_port *port)
2351 {
2352         int count, cnt;
2353
2354         if (port->x_char) {
2355                 outb(port->x_char, port->ioaddr + UART_TX);
2356                 port->x_char = 0;
2357                 mxvar_log.txcnt[port->tty->index]++;
2358                 port->mon_data.txcnt++;
2359                 port->mon_data.up_txcnt++;
2360                 port->icount.tx++;
2361                 return;
2362         }
2363
2364         if (port->xmit_buf == NULL)
2365                 return;
2366
2367         if ((port->xmit_cnt <= 0) || port->tty->stopped ||
2368                         (port->tty->hw_stopped &&
2369                         (port->type != PORT_16550A) &&
2370                         (!port->board->chip_flag))) {
2371                 port->IER &= ~UART_IER_THRI;
2372                 outb(port->IER, port->ioaddr + UART_IER);
2373                 return;
2374         }
2375
2376         cnt = port->xmit_cnt;
2377         count = port->xmit_fifo_size;
2378         do {
2379                 outb(port->xmit_buf[port->xmit_tail++],
2380                         port->ioaddr + UART_TX);
2381                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2382                 if (--port->xmit_cnt <= 0)
2383                         break;
2384         } while (--count > 0);
2385         mxvar_log.txcnt[port->tty->index] += (cnt - port->xmit_cnt);
2386
2387         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2388         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2389         port->icount.tx += (cnt - port->xmit_cnt);
2390
2391         if (port->xmit_cnt < WAKEUP_CHARS)
2392                 tty_wakeup(port->tty);
2393
2394         if (port->xmit_cnt <= 0) {
2395                 port->IER &= ~UART_IER_THRI;
2396                 outb(port->IER, port->ioaddr + UART_IER);
2397         }
2398 }
2399
2400 /*
2401  * This is the serial driver's generic interrupt routine
2402  */
2403 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2404 {
2405         int status, iir, i;
2406         struct mxser_board *brd = NULL;
2407         struct mxser_port *port;
2408         int max, irqbits, bits, msr;
2409         unsigned int int_cnt, pass_counter = 0;
2410         int handled = IRQ_NONE;
2411
2412         for (i = 0; i < MXSER_BOARDS; i++)
2413                 if (dev_id == &mxser_boards[i]) {
2414                         brd = dev_id;
2415                         break;
2416                 }
2417
2418         if (i == MXSER_BOARDS)
2419                 goto irq_stop;
2420         if (brd == NULL)
2421                 goto irq_stop;
2422         max = brd->info->nports;
2423         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2424                 irqbits = inb(brd->vector) & brd->vector_mask;
2425                 if (irqbits == brd->vector_mask)
2426                         break;
2427
2428                 handled = IRQ_HANDLED;
2429                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2430                         if (irqbits == brd->vector_mask)
2431                                 break;
2432                         if (bits & irqbits)
2433                                 continue;
2434                         port = &brd->ports[i];
2435
2436                         int_cnt = 0;
2437                         spin_lock(&port->slock);
2438                         do {
2439                                 iir = inb(port->ioaddr + UART_IIR);
2440                                 if (iir & UART_IIR_NO_INT)
2441                                         break;
2442                                 iir &= MOXA_MUST_IIR_MASK;
2443                                 if (!port->tty ||
2444                                                 (port->flags & ASYNC_CLOSING) ||
2445                                                 !(port->flags &
2446                                                         ASYNC_INITIALIZED)) {
2447                                         status = inb(port->ioaddr + UART_LSR);
2448                                         outb(0x27, port->ioaddr + UART_FCR);
2449                                         inb(port->ioaddr + UART_MSR);
2450                                         break;
2451                                 }
2452
2453                                 status = inb(port->ioaddr + UART_LSR);
2454
2455                                 if (status & UART_LSR_PE)
2456                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2457                                 if (status & UART_LSR_FE)
2458                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2459                                 if (status & UART_LSR_OE)
2460                                         port->err_shadow |=
2461                                                 NPPI_NOTIFY_HW_OVERRUN;
2462                                 if (status & UART_LSR_BI)
2463                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2464
2465                                 if (port->board->chip_flag) {
2466                                         if (iir == MOXA_MUST_IIR_GDA ||
2467                                             iir == MOXA_MUST_IIR_RDA ||
2468                                             iir == MOXA_MUST_IIR_RTO ||
2469                                             iir == MOXA_MUST_IIR_LSR)
2470                                                 mxser_receive_chars(port,
2471                                                                 &status);
2472
2473                                 } else {
2474                                         status &= port->read_status_mask;
2475                                         if (status & UART_LSR_DR)
2476                                                 mxser_receive_chars(port,
2477                                                                 &status);
2478                                 }
2479                                 msr = inb(port->ioaddr + UART_MSR);
2480                                 if (msr & UART_MSR_ANY_DELTA)
2481                                         mxser_check_modem_status(port, msr);
2482
2483                                 if (port->board->chip_flag) {
2484                                         if (iir == 0x02 && (status &
2485                                                                 UART_LSR_THRE))
2486                                                 mxser_transmit_chars(port);
2487                                 } else {
2488                                         if (status & UART_LSR_THRE)
2489                                                 mxser_transmit_chars(port);
2490                                 }
2491                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2492                         spin_unlock(&port->slock);
2493                 }
2494         }
2495
2496 irq_stop:
2497         return handled;
2498 }
2499
2500 static const struct tty_operations mxser_ops = {
2501         .open = mxser_open,
2502         .close = mxser_close,
2503         .write = mxser_write,
2504         .put_char = mxser_put_char,
2505         .flush_chars = mxser_flush_chars,
2506         .write_room = mxser_write_room,
2507         .chars_in_buffer = mxser_chars_in_buffer,
2508         .flush_buffer = mxser_flush_buffer,
2509         .ioctl = mxser_ioctl,
2510         .throttle = mxser_throttle,
2511         .unthrottle = mxser_unthrottle,
2512         .set_termios = mxser_set_termios,
2513         .stop = mxser_stop,
2514         .start = mxser_start,
2515         .hangup = mxser_hangup,
2516         .break_ctl = mxser_rs_break,
2517         .wait_until_sent = mxser_wait_until_sent,
2518         .tiocmget = mxser_tiocmget,
2519         .tiocmset = mxser_tiocmset,
2520 };
2521
2522 /*
2523  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2524  */
2525
2526 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2527                 unsigned int irq)
2528 {
2529         if (irq)
2530                 free_irq(brd->irq, brd);
2531         if (pdev != NULL) {     /* PCI */
2532 #ifdef CONFIG_PCI
2533                 pci_release_region(pdev, 2);
2534                 pci_release_region(pdev, 3);
2535 #endif
2536         } else {
2537                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2538                 release_region(brd->vector, 1);
2539         }
2540 }
2541
2542 static int __devinit mxser_initbrd(struct mxser_board *brd,
2543                 struct pci_dev *pdev)
2544 {
2545         struct mxser_port *info;
2546         unsigned int i;
2547         int retval;
2548
2549         printk(KERN_INFO "max. baud rate = %d bps.\n", brd->ports[0].max_baud);
2550
2551         for (i = 0; i < brd->info->nports; i++) {
2552                 info = &brd->ports[i];
2553                 info->board = brd;
2554                 info->stop_rx = 0;
2555                 info->ldisc_stop_rx = 0;
2556
2557                 /* Enhance mode enabled here */
2558                 if (brd->chip_flag != MOXA_OTHER_UART)
2559                         mxser_enable_must_enchance_mode(info->ioaddr);
2560
2561                 info->flags = ASYNC_SHARE_IRQ;
2562                 info->type = brd->uart_type;
2563
2564                 process_txrx_fifo(info);
2565
2566                 info->custom_divisor = info->baud_base * 16;
2567                 info->close_delay = 5 * HZ / 10;
2568                 info->closing_wait = 30 * HZ;
2569                 info->normal_termios = mxvar_sdriver->init_termios;
2570                 init_waitqueue_head(&info->open_wait);
2571                 init_waitqueue_head(&info->delta_msr_wait);
2572                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2573                 info->err_shadow = 0;
2574                 spin_lock_init(&info->slock);
2575
2576                 /* before set INT ISR, disable all int */
2577                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2578                         info->ioaddr + UART_IER);
2579         }
2580
2581         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2582                         brd);
2583         if (retval) {
2584                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2585                         "conflict with another device.\n",
2586                         brd->info->name, brd->irq);
2587                 /* We hold resources, we need to release them. */
2588                 mxser_release_res(brd, pdev, 0);
2589         }
2590         return retval;
2591 }
2592
2593 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2594 {
2595         int id, i, bits;
2596         unsigned short regs[16], irq;
2597         unsigned char scratch, scratch2;
2598
2599         brd->chip_flag = MOXA_OTHER_UART;
2600
2601         id = mxser_read_register(cap, regs);
2602         switch (id) {
2603         case C168_ASIC_ID:
2604                 brd->info = &mxser_cards[0];
2605                 break;
2606         case C104_ASIC_ID:
2607                 brd->info = &mxser_cards[1];
2608                 break;
2609         case CI104J_ASIC_ID:
2610                 brd->info = &mxser_cards[2];
2611                 break;
2612         case C102_ASIC_ID:
2613                 brd->info = &mxser_cards[5];
2614                 break;
2615         case CI132_ASIC_ID:
2616                 brd->info = &mxser_cards[6];
2617                 break;
2618         case CI134_ASIC_ID:
2619                 brd->info = &mxser_cards[7];
2620                 break;
2621         default:
2622                 return 0;
2623         }
2624
2625         irq = 0;
2626         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2627            Flag-hack checks if configuration should be read as 2-port here. */
2628         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2629                 irq = regs[9] & 0xF000;
2630                 irq = irq | (irq >> 4);
2631                 if (irq != (regs[9] & 0xFF00))
2632                         return MXSER_ERR_IRQ_CONFLIT;
2633         } else if (brd->info->nports == 4) {
2634                 irq = regs[9] & 0xF000;
2635                 irq = irq | (irq >> 4);
2636                 irq = irq | (irq >> 8);
2637                 if (irq != regs[9])
2638                         return MXSER_ERR_IRQ_CONFLIT;
2639         } else if (brd->info->nports == 8) {
2640                 irq = regs[9] & 0xF000;
2641                 irq = irq | (irq >> 4);
2642                 irq = irq | (irq >> 8);
2643                 if ((irq != regs[9]) || (irq != regs[10]))
2644                         return MXSER_ERR_IRQ_CONFLIT;
2645         }
2646
2647         if (!irq)
2648                 return MXSER_ERR_IRQ;
2649         brd->irq = ((int)(irq & 0xF000) >> 12);
2650         for (i = 0; i < 8; i++)
2651                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2652         if ((regs[12] & 0x80) == 0)
2653                 return MXSER_ERR_VECTOR;
2654         brd->vector = (int)regs[11];    /* interrupt vector */
2655         if (id == 1)
2656                 brd->vector_mask = 0x00FF;
2657         else
2658                 brd->vector_mask = 0x000F;
2659         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2660                 if (regs[12] & bits) {
2661                         brd->ports[i].baud_base = 921600;
2662                         brd->ports[i].max_baud = 921600;
2663                 } else {
2664                         brd->ports[i].baud_base = 115200;
2665                         brd->ports[i].max_baud = 115200;
2666                 }
2667         }
2668         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2669         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2670         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2671         outb(scratch2, cap + UART_LCR);
2672         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2673         scratch = inb(cap + UART_IIR);
2674
2675         if (scratch & 0xC0)
2676                 brd->uart_type = PORT_16550A;
2677         else
2678                 brd->uart_type = PORT_16450;
2679         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2680                         "mxser(IO)"))
2681                 return MXSER_ERR_IOADDR;
2682         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2683                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2684                 return MXSER_ERR_VECTOR;
2685         }
2686         return brd->info->nports;
2687 }
2688
2689 static int __devinit mxser_probe(struct pci_dev *pdev,
2690                 const struct pci_device_id *ent)
2691 {
2692 #ifdef CONFIG_PCI
2693         struct mxser_board *brd;
2694         unsigned int i, j;
2695         unsigned long ioaddress;
2696         int retval = -EINVAL;
2697
2698         for (i = 0; i < MXSER_BOARDS; i++)
2699                 if (mxser_boards[i].info == NULL)
2700                         break;
2701
2702         if (i >= MXSER_BOARDS) {
2703                 printk(KERN_ERR "Too many Smartio/Industio family boards found "
2704                         "(maximum %d), board not configured\n", MXSER_BOARDS);
2705                 goto err;
2706         }
2707
2708         brd = &mxser_boards[i];
2709         brd->idx = i * MXSER_PORTS_PER_BOARD;
2710         printk(KERN_INFO "Found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2711                 mxser_cards[ent->driver_data].name,
2712                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2713
2714         retval = pci_enable_device(pdev);
2715         if (retval) {
2716                 printk(KERN_ERR "Moxa SmartI/O PCI enable fail !\n");
2717                 goto err;
2718         }
2719
2720         /* io address */
2721         ioaddress = pci_resource_start(pdev, 2);
2722         retval = pci_request_region(pdev, 2, "mxser(IO)");
2723         if (retval)
2724                 goto err;
2725
2726         brd->info = &mxser_cards[ent->driver_data];
2727         for (i = 0; i < brd->info->nports; i++)
2728                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2729
2730         /* vector */
2731         ioaddress = pci_resource_start(pdev, 3);
2732         retval = pci_request_region(pdev, 3, "mxser(vector)");
2733         if (retval)
2734                 goto err_relio;
2735         brd->vector = ioaddress;
2736
2737         /* irq */
2738         brd->irq = pdev->irq;
2739
2740         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2741         brd->uart_type = PORT_16550A;
2742         brd->vector_mask = 0;
2743
2744         for (i = 0; i < brd->info->nports; i++) {
2745                 for (j = 0; j < UART_INFO_NUM; j++) {
2746                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2747                                 brd->ports[i].max_baud =
2748                                         Gpci_uart_info[j].max_baud;
2749
2750                                 /* exception....CP-102 */
2751                                 if (brd->info->flags & MXSER_HIGHBAUD)
2752                                         brd->ports[i].max_baud = 921600;
2753                                 break;
2754                         }
2755                 }
2756         }
2757
2758         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2759                 for (i = 0; i < brd->info->nports; i++) {
2760                         if (i < 4)
2761                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2762                         else
2763                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2764                 }
2765                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2766                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2767         }
2768
2769         for (i = 0; i < brd->info->nports; i++) {
2770                 brd->vector_mask |= (1 << i);
2771                 brd->ports[i].baud_base = 921600;
2772         }
2773
2774         /* mxser_initbrd will hook ISR. */
2775         retval = mxser_initbrd(brd, pdev);
2776         if (retval)
2777                 goto err_null;
2778
2779         for (i = 0; i < brd->info->nports; i++)
2780                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2781
2782         pci_set_drvdata(pdev, brd);
2783
2784         return 0;
2785 err_relio:
2786         pci_release_region(pdev, 2);
2787 err_null:
2788         brd->info = NULL;
2789 err:
2790         return retval;
2791 #else
2792         return -ENODEV;
2793 #endif
2794 }
2795
2796 static void __devexit mxser_remove(struct pci_dev *pdev)
2797 {
2798         struct mxser_board *brd = pci_get_drvdata(pdev);
2799         unsigned int i;
2800
2801         for (i = 0; i < brd->info->nports; i++)
2802                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2803
2804         mxser_release_res(brd, pdev, 1);
2805         brd->info = NULL;
2806 }
2807
2808 static struct pci_driver mxser_driver = {
2809         .name = "mxser",
2810         .id_table = mxser_pcibrds,
2811         .probe = mxser_probe,
2812         .remove = __devexit_p(mxser_remove)
2813 };
2814
2815 static int __init mxser_module_init(void)
2816 {
2817         struct mxser_board *brd;
2818         unsigned long cap;
2819         unsigned int i, m, isaloop;
2820         int retval, b;
2821
2822         pr_debug("Loading module mxser ...\n");
2823
2824         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2825         if (!mxvar_sdriver)
2826                 return -ENOMEM;
2827
2828         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2829                 MXSER_VERSION);
2830
2831         /* Initialize the tty_driver structure */
2832         mxvar_sdriver->owner = THIS_MODULE;
2833         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2834         mxvar_sdriver->name = "ttyMI";
2835         mxvar_sdriver->major = ttymajor;
2836         mxvar_sdriver->minor_start = 0;
2837         mxvar_sdriver->num = MXSER_PORTS + 1;
2838         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2839         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2840         mxvar_sdriver->init_termios = tty_std_termios;
2841         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2842         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2843         tty_set_operations(mxvar_sdriver, &mxser_ops);
2844
2845         retval = tty_register_driver(mxvar_sdriver);
2846         if (retval) {
2847                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2848                                 "tty driver !\n");
2849                 goto err_put;
2850         }
2851
2852         mxvar_diagflag = 0;
2853
2854         m = 0;
2855         /* Start finding ISA boards here */
2856         for (isaloop = 0; isaloop < 2; isaloop++)
2857                 for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
2858                         if (!isaloop)
2859                                 cap = mxserBoardCAP[b]; /* predefined */
2860                         else
2861                                 cap = ioaddr[b]; /* module param */
2862
2863                         if (!cap)
2864                                 continue;
2865
2866                         brd = &mxser_boards[m];
2867                         retval = mxser_get_ISA_conf(cap, brd);
2868
2869                         if (retval != 0)
2870                                 printk(KERN_INFO "Found MOXA %s board "
2871                                         "(CAP=0x%x)\n",
2872                                         brd->info->name, ioaddr[b]);
2873
2874                         if (retval <= 0) {
2875                                 if (retval == MXSER_ERR_IRQ)
2876                                         printk(KERN_ERR "Invalid interrupt "
2877                                                 "number, board not "
2878                                                 "configured\n");
2879                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
2880                                         printk(KERN_ERR "Invalid interrupt "
2881                                                 "number, board not "
2882                                                 "configured\n");
2883                                 else if (retval == MXSER_ERR_VECTOR)
2884                                         printk(KERN_ERR "Invalid interrupt "
2885                                                 "vector, board not "
2886                                                 "configured\n");
2887                                 else if (retval == MXSER_ERR_IOADDR)
2888                                         printk(KERN_ERR "Invalid I/O address, "
2889                                                 "board not configured\n");
2890
2891                                 brd->info = NULL;
2892                                 continue;
2893                         }
2894
2895                         /* mxser_initbrd will hook ISR. */
2896                         if (mxser_initbrd(brd, NULL) < 0) {
2897                                 brd->info = NULL;
2898                                 continue;
2899                         }
2900
2901                         brd->idx = m * MXSER_PORTS_PER_BOARD;
2902                         for (i = 0; i < brd->info->nports; i++)
2903                                 tty_register_device(mxvar_sdriver, brd->idx + i,
2904                                                 NULL);
2905
2906                         m++;
2907                 }
2908
2909         retval = pci_register_driver(&mxser_driver);
2910         if (retval) {
2911                 printk(KERN_ERR "Can't register pci driver\n");
2912                 if (!m) {
2913                         retval = -ENODEV;
2914                         goto err_unr;
2915                 } /* else: we have some ISA cards under control */
2916         }
2917
2918         pr_debug("Done.\n");
2919
2920         return 0;
2921 err_unr:
2922         tty_unregister_driver(mxvar_sdriver);
2923 err_put:
2924         put_tty_driver(mxvar_sdriver);
2925         return retval;
2926 }
2927
2928 static void __exit mxser_module_exit(void)
2929 {
2930         unsigned int i, j;
2931
2932         pr_debug("Unloading module mxser ...\n");
2933
2934         pci_unregister_driver(&mxser_driver);
2935
2936         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2937                 if (mxser_boards[i].info != NULL)
2938                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2939                                 tty_unregister_device(mxvar_sdriver,
2940                                                 mxser_boards[i].idx + j);
2941         tty_unregister_driver(mxvar_sdriver);
2942         put_tty_driver(mxvar_sdriver);
2943
2944         for (i = 0; i < MXSER_BOARDS; i++)
2945                 if (mxser_boards[i].info != NULL)
2946                         mxser_release_res(&mxser_boards[i], NULL, 1);
2947
2948         pr_debug("Done.\n");
2949 }
2950
2951 module_init(mxser_module_init);
2952 module_exit(mxser_module_exit);