drivers/tty/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
  18  *      www.moxa.com.
  19  *      - Fixed x86_64 cleanness
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/serial.h>
  31 #include <linux/serial_reg.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/ioport.h>
  37 #include <linux/mm.h>
  38 #include <linux/delay.h>
  39 #include <linux/pci.h>
  40 #include <linux/bitops.h>
  41 #include <linux/slab.h>
  42 #include <linux/ratelimit.h>
  43
  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   "2.0.5"         /* 1.14 */
  51 #define MXSERMAJOR       174
  52
  53 #define MXSER_BOARDS            4       /* Max. boards */
  54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  56 #define MXSER_ISR_PASS_LIMIT    100
  57
  58 /*CheckIsMoxaMust return value*/
  59 #define MOXA_OTHER_UART         0x00
  60 #define MOXA_MUST_MU150_HWID    0x01
  61 #define MOXA_MUST_MU860_HWID    0x02
  62
  63 #define WAKEUP_CHARS            256
  64
  65 #define UART_MCR_AFE            0x20
  66 #define UART_LSR_SPECIAL        0x1E
  67
  68 #define PCI_DEVICE_ID_POS104UL  0x1044
  69 #define PCI_DEVICE_ID_CB108     0x1080
  70 #define PCI_DEVICE_ID_CP102UF   0x1023
  71 #define PCI_DEVICE_ID_CP112UL   0x1120
  72 #define PCI_DEVICE_ID_CB114     0x1142
  73 #define PCI_DEVICE_ID_CP114UL   0x1143
  74 #define PCI_DEVICE_ID_CB134I    0x1341
  75 #define PCI_DEVICE_ID_CP138U    0x1380
  76
  77
  78 #define C168_ASIC_ID    1
  79 #define C104_ASIC_ID    2
  80 #define C102_ASIC_ID    0xB
  81 #define CI132_ASIC_ID   4
  82 #define CI134_ASIC_ID   3
  83 #define CI104J_ASIC_ID  5
  84
  85 #define MXSER_HIGHBAUD  1
  86 #define MXSER_HAS2      2
  87
  88 /* This is only for PCI */
  89 static const struct {
  90         int type;
  91         int tx_fifo;
  92         int rx_fifo;
  93         int xmit_fifo_size;
  94         int rx_high_water;
  95         int rx_trigger;
  96         int rx_low_water;
  97         long max_baud;
  98 } Gpci_uart_info[] = {
  99         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 100         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 101         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 102 };
 103 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 104
 105 struct mxser_cardinfo {
 106         char *name;
 107         unsigned int nports;
 108         unsigned int flags;
 109 };
 110
 111 static const struct mxser_cardinfo mxser_cards[] = {
 112 /* 0*/  { "C168 series",        8, },
 113         { "C104 series",        4, },
 114         { "CI-104J series",     4, },
 115         { "C168H/PCI series",   8, },
 116         { "C104H/PCI series",   4, },
 117 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 118         { "CI-132 series",      4, MXSER_HAS2 },
 119         { "CI-134 series",      4, },
 120         { "CP-132 series",      2, },
 121         { "CP-114 series",      4, },
 122 /*10*/  { "CT-114 series",      4, },
 123         { "CP-102 series",      2, MXSER_HIGHBAUD },
 124         { "CP-104U series",     4, },
 125         { "CP-168U series",     8, },
 126         { "CP-132U series",     2, },
 127 /*15*/  { "CP-134U series",     4, },
 128         { "CP-104JU series",    4, },
 129         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 130         { "CP-118U series",     8, },
 131         { "CP-102UL series",    2, },
 132 /*20*/  { "CP-102U series",     2, },
 133         { "CP-118EL series",    8, },
 134         { "CP-168EL series",    8, },
 135         { "CP-104EL series",    4, },
 136         { "CB-108 series",      8, },
 137 /*25*/  { "CB-114 series",      4, },
 138         { "CB-134I series",     4, },
 139         { "CP-138U series",     8, },
 140         { "POS-104UL series",   4, },
 141         { "CP-114UL series",    4, },
 142 /*30*/  { "CP-102UF series",    2, },
 143         { "CP-112UL series",    2, },
 144 };
 145
 146 /* driver_data correspond to the lines in the structure above
 147    see also ISA probe function before you change something */
 148 static struct pci_device_id mxser_pcibrds[] = {
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),     .driver_data = 31 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 178
 179 static unsigned long ioaddr[MXSER_BOARDS];
 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, ulong, NULL, 0);
 187 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 188 module_param(ttymajor, int, 0);
 189 MODULE_LICENSE("GPL");
 190
 191 struct mxser_log {
 192         int tick;
 193         unsigned long rxcnt[MXSER_PORTS];
 194         unsigned long txcnt[MXSER_PORTS];
 195 };
 196
 197 struct mxser_mon {
 198         unsigned long rxcnt;
 199         unsigned long txcnt;
 200         unsigned long up_rxcnt;
 201         unsigned long up_txcnt;
 202         int modem_status;
 203         unsigned char hold_reason;
 204 };
 205
 206 struct mxser_mon_ext {
 207         unsigned long rx_cnt[32];
 208         unsigned long tx_cnt[32];
 209         unsigned long up_rxcnt[32];
 210         unsigned long up_txcnt[32];
 211         int modem_status[32];
 212
 213         long baudrate[32];
 214         int databits[32];
 215         int stopbits[32];
 216         int parity[32];
 217         int flowctrl[32];
 218         int fifo[32];
 219         int iftype[32];
 220 };
 221
 222 struct mxser_board;
 223
 224 struct mxser_port {
 225         struct tty_port port;
 226         struct mxser_board *board;
 227
 228         unsigned long ioaddr;
 229         unsigned long opmode_ioaddr;
 230         int max_baud;
 231
 232         int rx_high_water;
 233         int rx_trigger;         /* Rx fifo trigger level */
 234         int rx_low_water;
 235         int baud_base;          /* max. speed */
 236         int type;               /* UART type */
 237
 238         int x_char;             /* xon/xoff character */
 239         int IER;                /* Interrupt Enable Register */
 240         int MCR;                /* Modem control register */
 241
 242         unsigned char stop_rx;
 243         unsigned char ldisc_stop_rx;
 244
 245         int custom_divisor;
 246         unsigned char err_shadow;
 247
 248         struct async_icount icount; /* kernel counters for 4 input interrupts */
 249         int timeout;
 250
 251         int read_status_mask;
 252         int ignore_status_mask;
 253         int xmit_fifo_size;
 254         int xmit_head;
 255         int xmit_tail;
 256         int xmit_cnt;
 257         int closing;
 258
 259         struct ktermios normal_termios;
 260
 261         struct mxser_mon mon_data;
 262
 263         spinlock_t slock;
 264 };
 265
 266 struct mxser_board {
 267         unsigned int idx;
 268         int irq;
 269         const struct mxser_cardinfo *info;
 270         unsigned long vector;
 271         unsigned long vector_mask;
 272
 273         int chip_flag;
 274         int uart_type;
 275
 276         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 277 };
 278
 279 struct mxser_mstatus {
 280         tcflag_t cflag;
 281         int cts;
 282         int dsr;
 283         int ri;
 284         int dcd;
 285 };
 286
 287 static struct mxser_board mxser_boards[MXSER_BOARDS];
 288 static struct tty_driver *mxvar_sdriver;
 289 static struct mxser_log mxvar_log;
 290 static int mxser_set_baud_method[MXSER_PORTS + 1];
 291
 292 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 293 {
 294         u8 oldlcr;
 295         u8 efr;
 296
 297         oldlcr = inb(baseio + UART_LCR);
 298         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 299
 300         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 301         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 302
 303         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 304         outb(oldlcr, baseio + UART_LCR);
 305 }
 306
 307 #ifdef  CONFIG_PCI
 308 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 309 {
 310         u8 oldlcr;
 311         u8 efr;
 312
 313         oldlcr = inb(baseio + UART_LCR);
 314         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 315
 316         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 317         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 318
 319         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 320         outb(oldlcr, baseio + UART_LCR);
 321 }
 322 #endif
 323
 324 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 325 {
 326         u8 oldlcr;
 327         u8 efr;
 328
 329         oldlcr = inb(baseio + UART_LCR);
 330         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 331
 332         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 333         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 334         efr |= MOXA_MUST_EFR_BANK0;
 335
 336         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 337         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 338         outb(oldlcr, baseio + UART_LCR);
 339 }
 340
 341 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 342 {
 343         u8 oldlcr;
 344         u8 efr;
 345
 346         oldlcr = inb(baseio + UART_LCR);
 347         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 348
 349         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 350         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 351         efr |= MOXA_MUST_EFR_BANK0;
 352
 353         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 354         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 355         outb(oldlcr, baseio + UART_LCR);
 356 }
 357
 358 static void mxser_set_must_fifo_value(struct mxser_port *info)
 359 {
 360         u8 oldlcr;
 361         u8 efr;
 362
 363         oldlcr = inb(info->ioaddr + UART_LCR);
 364         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 365
 366         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 367         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 368         efr |= MOXA_MUST_EFR_BANK1;
 369
 370         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 371         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 372         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 373         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 374         outb(oldlcr, info->ioaddr + UART_LCR);
 375 }
 376
 377 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 378 {
 379         u8 oldlcr;
 380         u8 efr;
 381
 382         oldlcr = inb(baseio + UART_LCR);
 383         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 384
 385         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 386         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 387         efr |= MOXA_MUST_EFR_BANK2;
 388
 389         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 390         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 391         outb(oldlcr, baseio + UART_LCR);
 392 }
 393
 394 #ifdef CONFIG_PCI
 395 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 396 {
 397         u8 oldlcr;
 398         u8 efr;
 399
 400         oldlcr = inb(baseio + UART_LCR);
 401         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 402
 403         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 404         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 405         efr |= MOXA_MUST_EFR_BANK2;
 406
 407         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 408         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 409         outb(oldlcr, baseio + UART_LCR);
 410 }
 411 #endif
 412
 413 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 414 {
 415         u8 oldlcr;
 416         u8 efr;
 417
 418         oldlcr = inb(baseio + UART_LCR);
 419         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 420
 421         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 422         efr &= ~MOXA_MUST_EFR_SF_MASK;
 423
 424         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 425         outb(oldlcr, baseio + UART_LCR);
 426 }
 427
 428 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 429 {
 430         u8 oldlcr;
 431         u8 efr;
 432
 433         oldlcr = inb(baseio + UART_LCR);
 434         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 435
 436         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 437         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 438         efr |= MOXA_MUST_EFR_SF_TX1;
 439
 440         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 441         outb(oldlcr, baseio + UART_LCR);
 442 }
 443
 444 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 445 {
 446         u8 oldlcr;
 447         u8 efr;
 448
 449         oldlcr = inb(baseio + UART_LCR);
 450         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 451
 452         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 453         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 454
 455         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 456         outb(oldlcr, baseio + UART_LCR);
 457 }
 458
 459 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 460 {
 461         u8 oldlcr;
 462         u8 efr;
 463
 464         oldlcr = inb(baseio + UART_LCR);
 465         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 466
 467         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 468         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 469         efr |= MOXA_MUST_EFR_SF_RX1;
 470
 471         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 472         outb(oldlcr, baseio + UART_LCR);
 473 }
 474
 475 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 476 {
 477         u8 oldlcr;
 478         u8 efr;
 479
 480         oldlcr = inb(baseio + UART_LCR);
 481         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 482
 483         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 484         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 485
 486         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 487         outb(oldlcr, baseio + UART_LCR);
 488 }
 489
 490 #ifdef CONFIG_PCI
 491 static int CheckIsMoxaMust(unsigned long io)
 492 {
 493         u8 oldmcr, hwid;
 494         int i;
 495
 496         outb(0, io + UART_LCR);
 497         mxser_disable_must_enchance_mode(io);
 498         oldmcr = inb(io + UART_MCR);
 499         outb(0, io + UART_MCR);
 500         mxser_set_must_xon1_value(io, 0x11);
 501         if ((hwid = inb(io + UART_MCR)) != 0) {
 502                 outb(oldmcr, io + UART_MCR);
 503                 return MOXA_OTHER_UART;
 504         }
 505
 506         mxser_get_must_hardware_id(io, &hwid);
 507         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 508                 if (hwid == Gpci_uart_info[i].type)
 509                         return (int)hwid;
 510         }
 511         return MOXA_OTHER_UART;
 512 }
 513 #endif
 514
 515 static void process_txrx_fifo(struct mxser_port *info)
 516 {
 517         int i;
 518
 519         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 520                 info->rx_trigger = 1;
 521                 info->rx_high_water = 1;
 522                 info->rx_low_water = 1;
 523                 info->xmit_fifo_size = 1;
 524         } else
 525                 for (i = 0; i < UART_INFO_NUM; i++)
 526                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 527                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 528                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 529                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 530                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 531                                 break;
 532                         }
 533 }
 534
 535 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 536 {
 537         static unsigned char mxser_msr[MXSER_PORTS + 1];
 538         unsigned char status = 0;
 539
 540         status = inb(baseaddr + UART_MSR);
 541
 542         mxser_msr[port] &= 0x0F;
 543         mxser_msr[port] |= status;
 544         status = mxser_msr[port];
 545         if (mode)
 546                 mxser_msr[port] = 0;
 547
 548         return status;
 549 }
 550
 551 static int mxser_carrier_raised(struct tty_port *port)
 552 {
 553         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 554         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
 555 }
 556
 557 static void mxser_dtr_rts(struct tty_port *port, int on)
 558 {
 559         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 560         unsigned long flags;
 561
 562         spin_lock_irqsave(&mp->slock, flags);
 563         if (on)
 564                 outb(inb(mp->ioaddr + UART_MCR) |
 565                         UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
 566         else
 567                 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
 568                         mp->ioaddr + UART_MCR);
 569         spin_unlock_irqrestore(&mp->slock, flags);
 570 }
 571
 572 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 573 {
 574         struct mxser_port *info = tty->driver_data;
 575         int quot = 0, baud;
 576         unsigned char cval;
 577
 578         if (!info->ioaddr)
 579                 return -1;
 580
 581         if (newspd > info->max_baud)
 582                 return -1;
 583
 584         if (newspd == 134) {
 585                 quot = 2 * info->baud_base / 269;
 586                 tty_encode_baud_rate(tty, 134, 134);
 587         } else if (newspd) {
 588                 quot = info->baud_base / newspd;
 589                 if (quot == 0)
 590                         quot = 1;
 591                 baud = info->baud_base/quot;
 592                 tty_encode_baud_rate(tty, baud, baud);
 593         } else {
 594                 quot = 0;
 595         }
 596
 597         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 598         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 599
 600         if (quot) {
 601                 info->MCR |= UART_MCR_DTR;
 602                 outb(info->MCR, info->ioaddr + UART_MCR);
 603         } else {
 604                 info->MCR &= ~UART_MCR_DTR;
 605                 outb(info->MCR, info->ioaddr + UART_MCR);
 606                 return 0;
 607         }
 608
 609         cval = inb(info->ioaddr + UART_LCR);
 610
 611         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 612
 613         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 614         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 615         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 616
 617 #ifdef BOTHER
 618         if (C_BAUD(tty) == BOTHER) {
 619                 quot = info->baud_base % newspd;
 620                 quot *= 8;
 621                 if (quot % newspd > newspd / 2) {
 622                         quot /= newspd;
 623                         quot++;
 624                 } else
 625                         quot /= newspd;
 626
 627                 mxser_set_must_enum_value(info->ioaddr, quot);
 628         } else
 629 #endif
 630                 mxser_set_must_enum_value(info->ioaddr, 0);
 631
 632         return 0;
 633 }
 634
 635 /*
 636  * This routine is called to set the UART divisor registers to match
 637  * the specified baud rate for a serial port.
 638  */
 639 static int mxser_change_speed(struct tty_struct *tty,
 640                                         struct ktermios *old_termios)
 641 {
 642         struct mxser_port *info = tty->driver_data;
 643         unsigned cflag, cval, fcr;
 644         int ret = 0;
 645         unsigned char status;
 646
 647         cflag = tty->termios.c_cflag;
 648         if (!info->ioaddr)
 649                 return ret;
 650
 651         if (mxser_set_baud_method[tty->index] == 0)
 652                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 653
 654         /* byte size and parity */
 655         switch (cflag & CSIZE) {
 656         case CS5:
 657                 cval = 0x00;
 658                 break;
 659         case CS6:
 660                 cval = 0x01;
 661                 break;
 662         case CS7:
 663                 cval = 0x02;
 664                 break;
 665         case CS8:
 666                 cval = 0x03;
 667                 break;
 668         default:
 669                 cval = 0x00;
 670                 break;          /* too keep GCC shut... */
 671         }
 672         if (cflag & CSTOPB)
 673                 cval |= 0x04;
 674         if (cflag & PARENB)
 675                 cval |= UART_LCR_PARITY;
 676         if (!(cflag & PARODD))
 677                 cval |= UART_LCR_EPAR;
 678         if (cflag & CMSPAR)
 679                 cval |= UART_LCR_SPAR;
 680
 681         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 682                 if (info->board->chip_flag) {
 683                         fcr = UART_FCR_ENABLE_FIFO;
 684                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 685                         mxser_set_must_fifo_value(info);
 686                 } else
 687                         fcr = 0;
 688         } else {
 689                 fcr = UART_FCR_ENABLE_FIFO;
 690                 if (info->board->chip_flag) {
 691                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 692                         mxser_set_must_fifo_value(info);
 693                 } else {
 694                         switch (info->rx_trigger) {
 695                         case 1:
 696                                 fcr |= UART_FCR_TRIGGER_1;
 697                                 break;
 698                         case 4:
 699                                 fcr |= UART_FCR_TRIGGER_4;
 700                                 break;
 701                         case 8:
 702                                 fcr |= UART_FCR_TRIGGER_8;
 703                                 break;
 704                         default:
 705                                 fcr |= UART_FCR_TRIGGER_14;
 706                                 break;
 707                         }
 708                 }
 709         }
 710
 711         /* CTS flow control flag and modem status interrupts */
 712         info->IER &= ~UART_IER_MSI;
 713         info->MCR &= ~UART_MCR_AFE;
 714         if (cflag & CRTSCTS) {
 715                 info->port.flags |= ASYNC_CTS_FLOW;
 716                 info->IER |= UART_IER_MSI;
 717                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 718                         info->MCR |= UART_MCR_AFE;
 719                 } else {
 720                         status = inb(info->ioaddr + UART_MSR);
 721                         if (tty->hw_stopped) {
 722                                 if (status & UART_MSR_CTS) {
 723                                         tty->hw_stopped = 0;
 724                                         if (info->type != PORT_16550A &&
 725                                                         !info->board->chip_flag) {
 726                                                 outb(info->IER & ~UART_IER_THRI,
 727                                                         info->ioaddr +
 728                                                         UART_IER);
 729                                                 info->IER |= UART_IER_THRI;
 730                                                 outb(info->IER, info->ioaddr +
 731                                                                 UART_IER);
 732                                         }
 733                                         tty_wakeup(tty);
 734                                 }
 735                         } else {
 736                                 if (!(status & UART_MSR_CTS)) {
 737                                         tty->hw_stopped = 1;
 738                                         if ((info->type != PORT_16550A) &&
 739                                                         (!info->board->chip_flag)) {
 740                                                 info->IER &= ~UART_IER_THRI;
 741                                                 outb(info->IER, info->ioaddr +
 742                                                                 UART_IER);
 743                                         }
 744                                 }
 745                         }
 746                 }
 747         } else {
 748                 info->port.flags &= ~ASYNC_CTS_FLOW;
 749         }
 750         outb(info->MCR, info->ioaddr + UART_MCR);
 751         if (cflag & CLOCAL) {
 752                 info->port.flags &= ~ASYNC_CHECK_CD;
 753         } else {
 754                 info->port.flags |= ASYNC_CHECK_CD;
 755                 info->IER |= UART_IER_MSI;
 756         }
 757         outb(info->IER, info->ioaddr + UART_IER);
 758
 759         /*
 760          * Set up parity check flag
 761          */
 762         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 763         if (I_INPCK(tty))
 764                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 765         if (I_BRKINT(tty) || I_PARMRK(tty))
 766                 info->read_status_mask |= UART_LSR_BI;
 767
 768         info->ignore_status_mask = 0;
 769
 770         if (I_IGNBRK(tty)) {
 771                 info->ignore_status_mask |= UART_LSR_BI;
 772                 info->read_status_mask |= UART_LSR_BI;
 773                 /*
 774                  * If we're ignore parity and break indicators, ignore
 775                  * overruns too.  (For real raw support).
 776                  */
 777                 if (I_IGNPAR(tty)) {
 778                         info->ignore_status_mask |=
 779                                                 UART_LSR_OE |
 780                                                 UART_LSR_PE |
 781                                                 UART_LSR_FE;
 782                         info->read_status_mask |=
 783                                                 UART_LSR_OE |
 784                                                 UART_LSR_PE |
 785                                                 UART_LSR_FE;
 786                 }
 787         }
 788         if (info->board->chip_flag) {
 789                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 790                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 791                 if (I_IXON(tty)) {
 792                         mxser_enable_must_rx_software_flow_control(
 793                                         info->ioaddr);
 794                 } else {
 795                         mxser_disable_must_rx_software_flow_control(
 796                                         info->ioaddr);
 797                 }
 798                 if (I_IXOFF(tty)) {
 799                         mxser_enable_must_tx_software_flow_control(
 800                                         info->ioaddr);
 801                 } else {
 802                         mxser_disable_must_tx_software_flow_control(
 803                                         info->ioaddr);
 804                 }
 805         }
 806
 807
 808         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 809         outb(cval, info->ioaddr + UART_LCR);
 810
 811         return ret;
 812 }
 813
 814 static void mxser_check_modem_status(struct tty_struct *tty,
 815                                 struct mxser_port *port, int status)
 816 {
 817         /* update input line counters */
 818         if (status & UART_MSR_TERI)
 819                 port->icount.rng++;
 820         if (status & UART_MSR_DDSR)
 821                 port->icount.dsr++;
 822         if (status & UART_MSR_DDCD)
 823                 port->icount.dcd++;
 824         if (status & UART_MSR_DCTS)
 825                 port->icount.cts++;
 826         port->mon_data.modem_status = status;
 827         wake_up_interruptible(&port->port.delta_msr_wait);
 828
 829         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 830                 if (status & UART_MSR_DCD)
 831                         wake_up_interruptible(&port->port.open_wait);
 832         }
 833
 834         if (tty_port_cts_enabled(&port->port)) {
 835                 if (tty->hw_stopped) {
 836                         if (status & UART_MSR_CTS) {
 837                                 tty->hw_stopped = 0;
 838
 839                                 if ((port->type != PORT_16550A) &&
 840                                                 (!port->board->chip_flag)) {
 841                                         outb(port->IER & ~UART_IER_THRI,
 842                                                 port->ioaddr + UART_IER);
 843                                         port->IER |= UART_IER_THRI;
 844                                         outb(port->IER, port->ioaddr +
 845                                                         UART_IER);
 846                                 }
 847                                 tty_wakeup(tty);
 848                         }
 849                 } else {
 850                         if (!(status & UART_MSR_CTS)) {
 851                                 tty->hw_stopped = 1;
 852                                 if (port->type != PORT_16550A &&
 853                                                 !port->board->chip_flag) {
 854                                         port->IER &= ~UART_IER_THRI;
 855                                         outb(port->IER, port->ioaddr +
 856                                                         UART_IER);
 857                                 }
 858                         }
 859                 }
 860         }
 861 }
 862
 863 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 864 {
 865         struct mxser_port *info = container_of(port, struct mxser_port, port);
 866         unsigned long page;
 867         unsigned long flags;
 868
 869         page = __get_free_page(GFP_KERNEL);
 870         if (!page)
 871                 return -ENOMEM;
 872
 873         spin_lock_irqsave(&info->slock, flags);
 874
 875         if (!info->ioaddr || !info->type) {
 876                 set_bit(TTY_IO_ERROR, &tty->flags);
 877                 free_page(page);
 878                 spin_unlock_irqrestore(&info->slock, flags);
 879                 return 0;
 880         }
 881         info->port.xmit_buf = (unsigned char *) page;
 882
 883         /*
 884          * Clear the FIFO buffers and disable them
 885          * (they will be reenabled in mxser_change_speed())
 886          */
 887         if (info->board->chip_flag)
 888                 outb((UART_FCR_CLEAR_RCVR |
 889                         UART_FCR_CLEAR_XMIT |
 890                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 891         else
 892                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 893                         info->ioaddr + UART_FCR);
 894
 895         /*
 896          * At this point there's no way the LSR could still be 0xFF;
 897          * if it is, then bail out, because there's likely no UART
 898          * here.
 899          */
 900         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 901                 spin_unlock_irqrestore(&info->slock, flags);
 902                 if (capable(CAP_SYS_ADMIN)) {
 903                         set_bit(TTY_IO_ERROR, &tty->flags);
 904                         return 0;
 905                 } else
 906                         return -ENODEV;
 907         }
 908
 909         /*
 910          * Clear the interrupt registers.
 911          */
 912         (void) inb(info->ioaddr + UART_LSR);
 913         (void) inb(info->ioaddr + UART_RX);
 914         (void) inb(info->ioaddr + UART_IIR);
 915         (void) inb(info->ioaddr + UART_MSR);
 916
 917         /*
 918          * Now, initialize the UART
 919          */
 920         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 921         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 922         outb(info->MCR, info->ioaddr + UART_MCR);
 923
 924         /*
 925          * Finally, enable interrupts
 926          */
 927         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 928
 929         if (info->board->chip_flag)
 930                 info->IER |= MOXA_MUST_IER_EGDAI;
 931         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 932
 933         /*
 934          * And clear the interrupt registers again for luck.
 935          */
 936         (void) inb(info->ioaddr + UART_LSR);
 937         (void) inb(info->ioaddr + UART_RX);
 938         (void) inb(info->ioaddr + UART_IIR);
 939         (void) inb(info->ioaddr + UART_MSR);
 940
 941         clear_bit(TTY_IO_ERROR, &tty->flags);
 942         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 943
 944         /*
 945          * and set the speed of the serial port
 946          */
 947         mxser_change_speed(tty, NULL);
 948         spin_unlock_irqrestore(&info->slock, flags);
 949
 950         return 0;
 951 }
 952
 953 /*
 954  * This routine will shutdown a serial port
 955  */
 956 static void mxser_shutdown_port(struct tty_port *port)
 957 {
 958         struct mxser_port *info = container_of(port, struct mxser_port, port);
 959         unsigned long flags;
 960
 961         spin_lock_irqsave(&info->slock, flags);
 962
 963         /*
 964          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 965          * here so the queue might never be waken up
 966          */
 967         wake_up_interruptible(&info->port.delta_msr_wait);
 968
 969         /*
 970          * Free the xmit buffer, if necessary
 971          */
 972         if (info->port.xmit_buf) {
 973                 free_page((unsigned long) info->port.xmit_buf);
 974                 info->port.xmit_buf = NULL;
 975         }
 976
 977         info->IER = 0;
 978         outb(0x00, info->ioaddr + UART_IER);
 979
 980         /* clear Rx/Tx FIFO's */
 981         if (info->board->chip_flag)
 982                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 983                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 984                                 info->ioaddr + UART_FCR);
 985         else
 986                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 987                         info->ioaddr + UART_FCR);
 988
 989         /* read data port to reset things */
 990         (void) inb(info->ioaddr + UART_RX);
 991
 992
 993         if (info->board->chip_flag)
 994                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 995
 996         spin_unlock_irqrestore(&info->slock, flags);
 997 }
 998
 999 /*
1000  * This routine is called whenever a serial port is opened.  It
1001  * enables interrupts for a serial port, linking in its async structure into
1002  * the IRQ chain.   It also performs the serial-specific
1003  * initialization for the tty structure.
1004  */
1005 static int mxser_open(struct tty_struct *tty, struct file *filp)
1006 {
1007         struct mxser_port *info;
1008         int line;
1009
1010         line = tty->index;
1011         if (line == MXSER_PORTS)
1012                 return 0;
1013         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1014         if (!info->ioaddr)
1015                 return -ENODEV;
1016
1017         tty->driver_data = info;
1018         return tty_port_open(&info->port, tty, filp);
1019 }
1020
1021 static void mxser_flush_buffer(struct tty_struct *tty)
1022 {
1023         struct mxser_port *info = tty->driver_data;
1024         char fcr;
1025         unsigned long flags;
1026
1027
1028         spin_lock_irqsave(&info->slock, flags);
1029         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1030
1031         fcr = inb(info->ioaddr + UART_FCR);
1032         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1033                 info->ioaddr + UART_FCR);
1034         outb(fcr, info->ioaddr + UART_FCR);
1035
1036         spin_unlock_irqrestore(&info->slock, flags);
1037
1038         tty_wakeup(tty);
1039 }
1040
1041
1042 static void mxser_close_port(struct tty_port *port)
1043 {
1044         struct mxser_port *info = container_of(port, struct mxser_port, port);
1045         unsigned long timeout;
1046         /*
1047          * At this point we stop accepting input.  To do this, we
1048          * disable the receive line status interrupts, and tell the
1049          * interrupt driver to stop checking the data ready bit in the
1050          * line status register.
1051          */
1052         info->IER &= ~UART_IER_RLSI;
1053         if (info->board->chip_flag)
1054                 info->IER &= ~MOXA_MUST_RECV_ISR;
1055
1056         outb(info->IER, info->ioaddr + UART_IER);
1057         /*
1058          * Before we drop DTR, make sure the UART transmitter
1059          * has completely drained; this is especially
1060          * important if there is a transmit FIFO!
1061          */
1062         timeout = jiffies + HZ;
1063         while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1064                 schedule_timeout_interruptible(5);
1065                 if (time_after(jiffies, timeout))
1066                         break;
1067         }
1068 }
1069
1070 /*
1071  * This routine is called when the serial port gets closed.  First, we
1072  * wait for the last remaining data to be sent.  Then, we unlink its
1073  * async structure from the interrupt chain if necessary, and we free
1074  * that IRQ if nothing is left in the chain.
1075  */
1076 static void mxser_close(struct tty_struct *tty, struct file *filp)
1077 {
1078         struct mxser_port *info = tty->driver_data;
1079         struct tty_port *port = &info->port;
1080
1081         if (tty->index == MXSER_PORTS || info == NULL)
1082                 return;
1083         if (tty_port_close_start(port, tty, filp) == 0)
1084                 return;
1085         info->closing = 1;
1086         mutex_lock(&port->mutex);
1087         mxser_close_port(port);
1088         mxser_flush_buffer(tty);
1089         if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
1090                 if (C_HUPCL(tty))
1091                         tty_port_lower_dtr_rts(port);
1092         }
1093         mxser_shutdown_port(port);
1094         clear_bit(ASYNCB_INITIALIZED, &port->flags);
1095         mutex_unlock(&port->mutex);
1096         info->closing = 0;
1097         /* Right now the tty_port set is done outside of the close_end helper
1098            as we don't yet have everyone using refcounts */
1099         tty_port_close_end(port, tty);
1100         tty_port_tty_set(port, NULL);
1101 }
1102
1103 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1104 {
1105         int c, total = 0;
1106         struct mxser_port *info = tty->driver_data;
1107         unsigned long flags;
1108
1109         if (!info->port.xmit_buf)
1110                 return 0;
1111
1112         while (1) {
1113                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1114                                           SERIAL_XMIT_SIZE - info->xmit_head));
1115                 if (c <= 0)
1116                         break;
1117
1118                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1119                 spin_lock_irqsave(&info->slock, flags);
1120                 info->xmit_head = (info->xmit_head + c) &
1121                                   (SERIAL_XMIT_SIZE - 1);
1122                 info->xmit_cnt += c;
1123                 spin_unlock_irqrestore(&info->slock, flags);
1124
1125                 buf += c;
1126                 count -= c;
1127                 total += c;
1128         }
1129
1130         if (info->xmit_cnt && !tty->stopped) {
1131                 if (!tty->hw_stopped ||
1132                                 (info->type == PORT_16550A) ||
1133                                 (info->board->chip_flag)) {
1134                         spin_lock_irqsave(&info->slock, flags);
1135                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1136                                         UART_IER);
1137                         info->IER |= UART_IER_THRI;
1138                         outb(info->IER, info->ioaddr + UART_IER);
1139                         spin_unlock_irqrestore(&info->slock, flags);
1140                 }
1141         }
1142         return total;
1143 }
1144
1145 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1146 {
1147         struct mxser_port *info = tty->driver_data;
1148         unsigned long flags;
1149
1150         if (!info->port.xmit_buf)
1151                 return 0;
1152
1153         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1154                 return 0;
1155
1156         spin_lock_irqsave(&info->slock, flags);
1157         info->port.xmit_buf[info->xmit_head++] = ch;
1158         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1159         info->xmit_cnt++;
1160         spin_unlock_irqrestore(&info->slock, flags);
1161         if (!tty->stopped) {
1162                 if (!tty->hw_stopped ||
1163                                 (info->type == PORT_16550A) ||
1164                                 info->board->chip_flag) {
1165                         spin_lock_irqsave(&info->slock, flags);
1166                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1167                         info->IER |= UART_IER_THRI;
1168                         outb(info->IER, info->ioaddr + UART_IER);
1169                         spin_unlock_irqrestore(&info->slock, flags);
1170                 }
1171         }
1172         return 1;
1173 }
1174
1175
1176 static void mxser_flush_chars(struct tty_struct *tty)
1177 {
1178         struct mxser_port *info = tty->driver_data;
1179         unsigned long flags;
1180
1181         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1182                         (tty->hw_stopped && info->type != PORT_16550A &&
1183                          !info->board->chip_flag))
1184                 return;
1185
1186         spin_lock_irqsave(&info->slock, flags);
1187
1188         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1189         info->IER |= UART_IER_THRI;
1190         outb(info->IER, info->ioaddr + UART_IER);
1191
1192         spin_unlock_irqrestore(&info->slock, flags);
1193 }
1194
1195 static int mxser_write_room(struct tty_struct *tty)
1196 {
1197         struct mxser_port *info = tty->driver_data;
1198         int ret;
1199
1200         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1201         return ret < 0 ? 0 : ret;
1202 }
1203
1204 static int mxser_chars_in_buffer(struct tty_struct *tty)
1205 {
1206         struct mxser_port *info = tty->driver_data;
1207         return info->xmit_cnt;
1208 }
1209
1210 /*
1211  * ------------------------------------------------------------
1212  * friends of mxser_ioctl()
1213  * ------------------------------------------------------------
1214  */
1215 static int mxser_get_serial_info(struct tty_struct *tty,
1216                 struct serial_struct __user *retinfo)
1217 {
1218         struct mxser_port *info = tty->driver_data;
1219         struct serial_struct tmp = {
1220                 .type = info->type,
1221                 .line = tty->index,
1222                 .port = info->ioaddr,
1223                 .irq = info->board->irq,
1224                 .flags = info->port.flags,
1225                 .baud_base = info->baud_base,
1226                 .close_delay = info->port.close_delay,
1227                 .closing_wait = info->port.closing_wait,
1228                 .custom_divisor = info->custom_divisor,
1229                 .hub6 = 0
1230         };
1231         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1232                 return -EFAULT;
1233         return 0;
1234 }
1235
1236 static int mxser_set_serial_info(struct tty_struct *tty,
1237                 struct serial_struct __user *new_info)
1238 {
1239         struct mxser_port *info = tty->driver_data;
1240         struct tty_port *port = &info->port;
1241         struct serial_struct new_serial;
1242         speed_t baud;
1243         unsigned long sl_flags;
1244         unsigned int flags;
1245         int retval = 0;
1246
1247         if (!new_info || !info->ioaddr)
1248                 return -ENODEV;
1249         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1250                 return -EFAULT;
1251
1252         if (new_serial.irq != info->board->irq ||
1253                         new_serial.port != info->ioaddr)
1254                 return -EINVAL;
1255
1256         flags = port->flags & ASYNC_SPD_MASK;
1257
1258         if (!capable(CAP_SYS_ADMIN)) {
1259                 if ((new_serial.baud_base != info->baud_base) ||
1260                                 (new_serial.close_delay != info->port.close_delay) ||
1261                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1262                         return -EPERM;
1263                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1264                                 (new_serial.flags & ASYNC_USR_MASK));
1265         } else {
1266                 /*
1267                  * OK, past this point, all the error checking has been done.
1268                  * At this point, we start making changes.....
1269                  */
1270                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1271                                 (new_serial.flags & ASYNC_FLAGS));
1272                 port->close_delay = new_serial.close_delay * HZ / 100;
1273                 port->closing_wait = new_serial.closing_wait * HZ / 100;
1274                 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1275                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1276                                 (new_serial.baud_base != info->baud_base ||
1277                                 new_serial.custom_divisor !=
1278                                 info->custom_divisor)) {
1279                         if (new_serial.custom_divisor == 0)
1280                                 return -EINVAL;
1281                         baud = new_serial.baud_base / new_serial.custom_divisor;
1282                         tty_encode_baud_rate(tty, baud, baud);
1283                 }
1284         }
1285
1286         info->type = new_serial.type;
1287
1288         process_txrx_fifo(info);
1289
1290         if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
1291                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1292                         spin_lock_irqsave(&info->slock, sl_flags);
1293                         mxser_change_speed(tty, NULL);
1294                         spin_unlock_irqrestore(&info->slock, sl_flags);
1295                 }
1296         } else {
1297                 retval = mxser_activate(port, tty);
1298                 if (retval == 0)
1299                         set_bit(ASYNCB_INITIALIZED, &port->flags);
1300         }
1301         return retval;
1302 }
1303
1304 /*
1305  * mxser_get_lsr_info - get line status register info
1306  *
1307  * Purpose: Let user call ioctl() to get info when the UART physically
1308  *          is emptied.  On bus types like RS485, the transmitter must
1309  *          release the bus after transmitting. This must be done when
1310  *          the transmit shift register is empty, not be done when the
1311  *          transmit holding register is empty.  This functionality
1312  *          allows an RS485 driver to be written in user space.
1313  */
1314 static int mxser_get_lsr_info(struct mxser_port *info,
1315                 unsigned int __user *value)
1316 {
1317         unsigned char status;
1318         unsigned int result;
1319         unsigned long flags;
1320
1321         spin_lock_irqsave(&info->slock, flags);
1322         status = inb(info->ioaddr + UART_LSR);
1323         spin_unlock_irqrestore(&info->slock, flags);
1324         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1325         return put_user(result, value);
1326 }
1327
1328 static int mxser_tiocmget(struct tty_struct *tty)
1329 {
1330         struct mxser_port *info = tty->driver_data;
1331         unsigned char control, status;
1332         unsigned long flags;
1333
1334
1335         if (tty->index == MXSER_PORTS)
1336                 return -ENOIOCTLCMD;
1337         if (test_bit(TTY_IO_ERROR, &tty->flags))
1338                 return -EIO;
1339
1340         control = info->MCR;
1341
1342         spin_lock_irqsave(&info->slock, flags);
1343         status = inb(info->ioaddr + UART_MSR);
1344         if (status & UART_MSR_ANY_DELTA)
1345                 mxser_check_modem_status(tty, info, status);
1346         spin_unlock_irqrestore(&info->slock, flags);
1347         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1348                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1349                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1350                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1351                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1352                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1353 }
1354
1355 static int mxser_tiocmset(struct tty_struct *tty,
1356                 unsigned int set, unsigned int clear)
1357 {
1358         struct mxser_port *info = tty->driver_data;
1359         unsigned long flags;
1360
1361
1362         if (tty->index == MXSER_PORTS)
1363                 return -ENOIOCTLCMD;
1364         if (test_bit(TTY_IO_ERROR, &tty->flags))
1365                 return -EIO;
1366
1367         spin_lock_irqsave(&info->slock, flags);
1368
1369         if (set & TIOCM_RTS)
1370                 info->MCR |= UART_MCR_RTS;
1371         if (set & TIOCM_DTR)
1372                 info->MCR |= UART_MCR_DTR;
1373
1374         if (clear & TIOCM_RTS)
1375                 info->MCR &= ~UART_MCR_RTS;
1376         if (clear & TIOCM_DTR)
1377                 info->MCR &= ~UART_MCR_DTR;
1378
1379         outb(info->MCR, info->ioaddr + UART_MCR);
1380         spin_unlock_irqrestore(&info->slock, flags);
1381         return 0;
1382 }
1383
1384 static int __init mxser_program_mode(int port)
1385 {
1386         int id, i, j, n;
1387
1388         outb(0, port);
1389         outb(0, port);
1390         outb(0, port);
1391         (void)inb(port);
1392         (void)inb(port);
1393         outb(0, port);
1394         (void)inb(port);
1395
1396         id = inb(port + 1) & 0x1F;
1397         if ((id != C168_ASIC_ID) &&
1398                         (id != C104_ASIC_ID) &&
1399                         (id != C102_ASIC_ID) &&
1400                         (id != CI132_ASIC_ID) &&
1401                         (id != CI134_ASIC_ID) &&
1402                         (id != CI104J_ASIC_ID))
1403                 return -1;
1404         for (i = 0, j = 0; i < 4; i++) {
1405                 n = inb(port + 2);
1406                 if (n == 'M') {
1407                         j = 1;
1408                 } else if ((j == 1) && (n == 1)) {
1409                         j = 2;
1410                         break;
1411                 } else
1412                         j = 0;
1413         }
1414         if (j != 2)
1415                 id = -2;
1416         return id;
1417 }
1418
1419 static void __init mxser_normal_mode(int port)
1420 {
1421         int i, n;
1422
1423         outb(0xA5, port + 1);
1424         outb(0x80, port + 3);
1425         outb(12, port + 0);     /* 9600 bps */
1426         outb(0, port + 1);
1427         outb(0x03, port + 3);   /* 8 data bits */
1428         outb(0x13, port + 4);   /* loop back mode */
1429         for (i = 0; i < 16; i++) {
1430                 n = inb(port + 5);
1431                 if ((n & 0x61) == 0x60)
1432                         break;
1433                 if ((n & 1) == 1)
1434                         (void)inb(port);
1435         }
1436         outb(0x00, port + 4);
1437 }
1438
1439 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1440 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1441 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1442 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1443 #define EN_CCMD         0x000   /* Chip's command register     */
1444 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1445 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1446 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1447 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1448 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1449 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1450 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1451 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1452 static int __init mxser_read_register(int port, unsigned short *regs)
1453 {
1454         int i, k, value, id;
1455         unsigned int j;
1456
1457         id = mxser_program_mode(port);
1458         if (id < 0)
1459                 return id;
1460         for (i = 0; i < 14; i++) {
1461                 k = (i & 0x3F) | 0x180;
1462                 for (j = 0x100; j > 0; j >>= 1) {
1463                         outb(CHIP_CS, port);
1464                         if (k & j) {
1465                                 outb(CHIP_CS | CHIP_DO, port);
1466                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1467                         } else {
1468                                 outb(CHIP_CS, port);
1469                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1470                         }
1471                 }
1472                 (void)inb(port);
1473                 value = 0;
1474                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1475                         outb(CHIP_CS, port);
1476                         outb(CHIP_CS | CHIP_SK, port);
1477                         if (inb(port) & CHIP_DI)
1478                                 value |= j;
1479                 }
1480                 regs[i] = value;
1481                 outb(0, port);
1482         }
1483         mxser_normal_mode(port);
1484         return id;
1485 }
1486
1487 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1488 {
1489         struct mxser_port *ip;
1490         struct tty_port *port;
1491         struct tty_struct *tty;
1492         int result, status;
1493         unsigned int i, j;
1494         int ret = 0;
1495
1496         switch (cmd) {
1497         case MOXA_GET_MAJOR:
1498                 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1499                                         "%x (GET_MAJOR), fix your userspace\n",
1500                                         current->comm, cmd);
1501                 return put_user(ttymajor, (int __user *)argp);
1502
1503         case MOXA_CHKPORTENABLE:
1504                 result = 0;
1505                 for (i = 0; i < MXSER_BOARDS; i++)
1506                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1507                                 if (mxser_boards[i].ports[j].ioaddr)
1508                                         result |= (1 << i);
1509                 return put_user(result, (unsigned long __user *)argp);
1510         case MOXA_GETDATACOUNT:
1511                 /* The receive side is locked by port->slock but it isn't
1512                    clear that an exact snapshot is worth copying here */
1513                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1514                         ret = -EFAULT;
1515                 return ret;
1516         case MOXA_GETMSTATUS: {
1517                 struct mxser_mstatus ms, __user *msu = argp;
1518                 for (i = 0; i < MXSER_BOARDS; i++)
1519                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1520                                 ip = &mxser_boards[i].ports[j];
1521                                 port = &ip->port;
1522                                 memset(&ms, 0, sizeof(ms));
1523
1524                                 mutex_lock(&port->mutex);
1525                                 if (!ip->ioaddr)
1526                                         goto copy;
1527
1528                                 tty = tty_port_tty_get(port);
1529
1530                                 if (!tty)
1531                                         ms.cflag = ip->normal_termios.c_cflag;
1532                                 else
1533                                         ms.cflag = tty->termios.c_cflag;
1534                                 tty_kref_put(tty);
1535                                 spin_lock_irq(&ip->slock);
1536                                 status = inb(ip->ioaddr + UART_MSR);
1537                                 spin_unlock_irq(&ip->slock);
1538                                 if (status & UART_MSR_DCD)
1539                                         ms.dcd = 1;
1540                                 if (status & UART_MSR_DSR)
1541                                         ms.dsr = 1;
1542                                 if (status & UART_MSR_CTS)
1543                                         ms.cts = 1;
1544                         copy:
1545                                 mutex_unlock(&port->mutex);
1546                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1547                                         return -EFAULT;
1548                                 msu++;
1549                         }
1550                 return 0;
1551         }
1552         case MOXA_ASPP_MON_EXT: {
1553                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1554                 unsigned int cflag, iflag, p;
1555                 u8 opmode;
1556
1557                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1558                 if (!me)
1559                         return -ENOMEM;
1560
1561                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1562                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1563                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1564                                         i = MXSER_BOARDS;
1565                                         break;
1566                                 }
1567                                 ip = &mxser_boards[i].ports[j];
1568                                 port = &ip->port;
1569
1570                                 mutex_lock(&port->mutex);
1571                                 if (!ip->ioaddr) {
1572                                         mutex_unlock(&port->mutex);
1573                                         continue;
1574                                 }
1575
1576                                 spin_lock_irq(&ip->slock);
1577                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1578
1579                                 if (status & UART_MSR_TERI)
1580                                         ip->icount.rng++;
1581                                 if (status & UART_MSR_DDSR)
1582                                         ip->icount.dsr++;
1583                                 if (status & UART_MSR_DDCD)
1584                                         ip->icount.dcd++;
1585                                 if (status & UART_MSR_DCTS)
1586                                         ip->icount.cts++;
1587
1588                                 ip->mon_data.modem_status = status;
1589                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1590                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1591                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1592                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1593                                 me->modem_status[p] =
1594                                         ip->mon_data.modem_status;
1595                                 spin_unlock_irq(&ip->slock);
1596
1597                                 tty = tty_port_tty_get(&ip->port);
1598
1599                                 if (!tty) {
1600                                         cflag = ip->normal_termios.c_cflag;
1601                                         iflag = ip->normal_termios.c_iflag;
1602                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1603                                 } else {
1604                                         cflag = tty->termios.c_cflag;
1605                                         iflag = tty->termios.c_iflag;
1606                                         me->baudrate[p] = tty_get_baud_rate(tty);
1607                                 }
1608                                 tty_kref_put(tty);
1609
1610                                 me->databits[p] = cflag & CSIZE;
1611                                 me->stopbits[p] = cflag & CSTOPB;
1612                                 me->parity[p] = cflag & (PARENB | PARODD |
1613                                                 CMSPAR);
1614
1615                                 if (cflag & CRTSCTS)
1616                                         me->flowctrl[p] |= 0x03;
1617
1618                                 if (iflag & (IXON | IXOFF))
1619                                         me->flowctrl[p] |= 0x0C;
1620
1621                                 if (ip->type == PORT_16550A)
1622                                         me->fifo[p] = 1;
1623
1624                                 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1625                                         opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1626                                         opmode &= OP_MODE_MASK;
1627                                 } else {
1628                                         opmode = RS232_MODE;
1629                                 }
1630                                 me->iftype[p] = opmode;
1631                                 mutex_unlock(&port->mutex);
1632                         }
1633                 }
1634                 if (copy_to_user(argp, me, sizeof(*me)))
1635                         ret = -EFAULT;
1636                 kfree(me);
1637                 return ret;
1638         }
1639         default:
1640                 return -ENOIOCTLCMD;
1641         }
1642         return 0;
1643 }
1644
1645 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1646                 struct async_icount *cprev)
1647 {
1648         struct async_icount cnow;
1649         unsigned long flags;
1650         int ret;
1651
1652         spin_lock_irqsave(&info->slock, flags);
1653         cnow = info->icount;    /* atomic copy */
1654         spin_unlock_irqrestore(&info->slock, flags);
1655
1656         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1657                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1658                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1659                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1660
1661         *cprev = cnow;
1662
1663         return ret;
1664 }
1665
1666 static int mxser_ioctl(struct tty_struct *tty,
1667                 unsigned int cmd, unsigned long arg)
1668 {
1669         struct mxser_port *info = tty->driver_data;
1670         struct tty_port *port = &info->port;
1671         struct async_icount cnow;
1672         unsigned long flags;
1673         void __user *argp = (void __user *)arg;
1674         int retval;
1675
1676         if (tty->index == MXSER_PORTS)
1677                 return mxser_ioctl_special(cmd, argp);
1678
1679         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1680                 int p;
1681                 unsigned long opmode;
1682                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1683                 int shiftbit;
1684                 unsigned char val, mask;
1685
1686                 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1687                         return -EFAULT;
1688
1689                 p = tty->index % 4;
1690                 if (cmd == MOXA_SET_OP_MODE) {
1691                         if (get_user(opmode, (int __user *) argp))
1692                                 return -EFAULT;
1693                         if (opmode != RS232_MODE &&
1694                                         opmode != RS485_2WIRE_MODE &&
1695                                         opmode != RS422_MODE &&
1696                                         opmode != RS485_4WIRE_MODE)
1697                                 return -EFAULT;
1698                         mask = ModeMask[p];
1699                         shiftbit = p * 2;
1700                         spin_lock_irq(&info->slock);
1701                         val = inb(info->opmode_ioaddr);
1702                         val &= mask;
1703                         val |= (opmode << shiftbit);
1704                         outb(val, info->opmode_ioaddr);
1705                         spin_unlock_irq(&info->slock);
1706                 } else {
1707                         shiftbit = p * 2;
1708                         spin_lock_irq(&info->slock);
1709                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1710                         spin_unlock_irq(&info->slock);
1711                         opmode &= OP_MODE_MASK;
1712                         if (put_user(opmode, (int __user *)argp))
1713                                 return -EFAULT;
1714                 }
1715                 return 0;
1716         }
1717
1718         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT &&
1719                         test_bit(TTY_IO_ERROR, &tty->flags))
1720                 return -EIO;
1721
1722         switch (cmd) {
1723         case TIOCGSERIAL:
1724                 mutex_lock(&port->mutex);
1725                 retval = mxser_get_serial_info(tty, argp);
1726                 mutex_unlock(&port->mutex);
1727                 return retval;
1728         case TIOCSSERIAL:
1729                 mutex_lock(&port->mutex);
1730                 retval = mxser_set_serial_info(tty, argp);
1731                 mutex_unlock(&port->mutex);
1732                 return retval;
1733         case TIOCSERGETLSR:     /* Get line status register */
1734                 return  mxser_get_lsr_info(info, argp);
1735                 /*
1736                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1737                  * - mask passed in arg for lines of interest
1738                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1739                  * Caller should use TIOCGICOUNT to see which one it was
1740                  */
1741         case TIOCMIWAIT:
1742                 spin_lock_irqsave(&info->slock, flags);
1743                 cnow = info->icount;    /* note the counters on entry */
1744                 spin_unlock_irqrestore(&info->slock, flags);
1745
1746                 return wait_event_interruptible(info->port.delta_msr_wait,
1747                                 mxser_cflags_changed(info, arg, &cnow));
1748         case MOXA_HighSpeedOn:
1749                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1750         case MOXA_SDS_RSTICOUNTER:
1751                 spin_lock_irq(&info->slock);
1752                 info->mon_data.rxcnt = 0;
1753                 info->mon_data.txcnt = 0;
1754                 spin_unlock_irq(&info->slock);
1755                 return 0;
1756
1757         case MOXA_ASPP_OQUEUE:{
1758                 int len, lsr;
1759
1760                 len = mxser_chars_in_buffer(tty);
1761                 spin_lock_irq(&info->slock);
1762                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1763                 spin_unlock_irq(&info->slock);
1764                 len += (lsr ? 0 : 1);
1765
1766                 return put_user(len, (int __user *)argp);
1767         }
1768         case MOXA_ASPP_MON: {
1769                 int mcr, status;
1770
1771                 spin_lock_irq(&info->slock);
1772                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1773                 mxser_check_modem_status(tty, info, status);
1774
1775                 mcr = inb(info->ioaddr + UART_MCR);
1776                 spin_unlock_irq(&info->slock);
1777
1778                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1779                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1780                 else
1781                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1782
1783                 if (mcr & MOXA_MUST_MCR_TX_XON)
1784                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1785                 else
1786                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1787
1788                 if (tty->hw_stopped)
1789                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1790                 else
1791                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1792
1793                 if (copy_to_user(argp, &info->mon_data,
1794                                 sizeof(struct mxser_mon)))
1795                         return -EFAULT;
1796
1797                 return 0;
1798         }
1799         case MOXA_ASPP_LSTATUS: {
1800                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1801                         return -EFAULT;
1802
1803                 info->err_shadow = 0;
1804                 return 0;
1805         }
1806         case MOXA_SET_BAUD_METHOD: {
1807                 int method;
1808
1809                 if (get_user(method, (int __user *)argp))
1810                         return -EFAULT;
1811                 mxser_set_baud_method[tty->index] = method;
1812                 return put_user(method, (int __user *)argp);
1813         }
1814         default:
1815                 return -ENOIOCTLCMD;
1816         }
1817         return 0;
1818 }
1819
1820         /*
1821          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1822          * Return: write counters to the user passed counter struct
1823          * NB: both 1->0 and 0->1 transitions are counted except for
1824          *     RI where only 0->1 is counted.
1825          */
1826
1827 static int mxser_get_icount(struct tty_struct *tty,
1828                 struct serial_icounter_struct *icount)
1829
1830 {
1831         struct mxser_port *info = tty->driver_data;
1832         struct async_icount cnow;
1833         unsigned long flags;
1834
1835         spin_lock_irqsave(&info->slock, flags);
1836         cnow = info->icount;
1837         spin_unlock_irqrestore(&info->slock, flags);
1838
1839         icount->frame = cnow.frame;
1840         icount->brk = cnow.brk;
1841         icount->overrun = cnow.overrun;
1842         icount->buf_overrun = cnow.buf_overrun;
1843         icount->parity = cnow.parity;
1844         icount->rx = cnow.rx;
1845         icount->tx = cnow.tx;
1846         icount->cts = cnow.cts;
1847         icount->dsr = cnow.dsr;
1848         icount->rng = cnow.rng;
1849         icount->dcd = cnow.dcd;
1850         return 0;
1851 }
1852
1853 static void mxser_stoprx(struct tty_struct *tty)
1854 {
1855         struct mxser_port *info = tty->driver_data;
1856
1857         info->ldisc_stop_rx = 1;
1858         if (I_IXOFF(tty)) {
1859                 if (info->board->chip_flag) {
1860                         info->IER &= ~MOXA_MUST_RECV_ISR;
1861                         outb(info->IER, info->ioaddr + UART_IER);
1862                 } else {
1863                         info->x_char = STOP_CHAR(tty);
1864                         outb(0, info->ioaddr + UART_IER);
1865                         info->IER |= UART_IER_THRI;
1866                         outb(info->IER, info->ioaddr + UART_IER);
1867                 }
1868         }
1869
1870         if (C_CRTSCTS(tty)) {
1871                 info->MCR &= ~UART_MCR_RTS;
1872                 outb(info->MCR, info->ioaddr + UART_MCR);
1873         }
1874 }
1875
1876 /*
1877  * This routine is called by the upper-layer tty layer to signal that
1878  * incoming characters should be throttled.
1879  */
1880 static void mxser_throttle(struct tty_struct *tty)
1881 {
1882         mxser_stoprx(tty);
1883 }
1884
1885 static void mxser_unthrottle(struct tty_struct *tty)
1886 {
1887         struct mxser_port *info = tty->driver_data;
1888
1889         /* startrx */
1890         info->ldisc_stop_rx = 0;
1891         if (I_IXOFF(tty)) {
1892                 if (info->x_char)
1893                         info->x_char = 0;
1894                 else {
1895                         if (info->board->chip_flag) {
1896                                 info->IER |= MOXA_MUST_RECV_ISR;
1897                                 outb(info->IER, info->ioaddr + UART_IER);
1898                         } else {
1899                                 info->x_char = START_CHAR(tty);
1900                                 outb(0, info->ioaddr + UART_IER);
1901                                 info->IER |= UART_IER_THRI;
1902                                 outb(info->IER, info->ioaddr + UART_IER);
1903                         }
1904                 }
1905         }
1906
1907         if (C_CRTSCTS(tty)) {
1908                 info->MCR |= UART_MCR_RTS;
1909                 outb(info->MCR, info->ioaddr + UART_MCR);
1910         }
1911 }
1912
1913 /*
1914  * mxser_stop() and mxser_start()
1915  *
1916  * This routines are called before setting or resetting tty->stopped.
1917  * They enable or disable transmitter interrupts, as necessary.
1918  */
1919 static void mxser_stop(struct tty_struct *tty)
1920 {
1921         struct mxser_port *info = tty->driver_data;
1922         unsigned long flags;
1923
1924         spin_lock_irqsave(&info->slock, flags);
1925         if (info->IER & UART_IER_THRI) {
1926                 info->IER &= ~UART_IER_THRI;
1927                 outb(info->IER, info->ioaddr + UART_IER);
1928         }
1929         spin_unlock_irqrestore(&info->slock, flags);
1930 }
1931
1932 static void mxser_start(struct tty_struct *tty)
1933 {
1934         struct mxser_port *info = tty->driver_data;
1935         unsigned long flags;
1936
1937         spin_lock_irqsave(&info->slock, flags);
1938         if (info->xmit_cnt && info->port.xmit_buf) {
1939                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1940                 info->IER |= UART_IER_THRI;
1941                 outb(info->IER, info->ioaddr + UART_IER);
1942         }
1943         spin_unlock_irqrestore(&info->slock, flags);
1944 }
1945
1946 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1947 {
1948         struct mxser_port *info = tty->driver_data;
1949         unsigned long flags;
1950
1951         spin_lock_irqsave(&info->slock, flags);
1952         mxser_change_speed(tty, old_termios);
1953         spin_unlock_irqrestore(&info->slock, flags);
1954
1955         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1956                 tty->hw_stopped = 0;
1957                 mxser_start(tty);
1958         }
1959
1960         /* Handle sw stopped */
1961         if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1962                 tty->stopped = 0;
1963
1964                 if (info->board->chip_flag) {
1965                         spin_lock_irqsave(&info->slock, flags);
1966                         mxser_disable_must_rx_software_flow_control(
1967                                         info->ioaddr);
1968                         spin_unlock_irqrestore(&info->slock, flags);
1969                 }
1970
1971                 mxser_start(tty);
1972         }
1973 }
1974
1975 /*
1976  * mxser_wait_until_sent() --- wait until the transmitter is empty
1977  */
1978 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1979 {
1980         struct mxser_port *info = tty->driver_data;
1981         unsigned long orig_jiffies, char_time;
1982         unsigned long flags;
1983         int lsr;
1984
1985         if (info->type == PORT_UNKNOWN)
1986                 return;
1987
1988         if (info->xmit_fifo_size == 0)
1989                 return;         /* Just in case.... */
1990
1991         orig_jiffies = jiffies;
1992         /*
1993          * Set the check interval to be 1/5 of the estimated time to
1994          * send a single character, and make it at least 1.  The check
1995          * interval should also be less than the timeout.
1996          *
1997          * Note: we have to use pretty tight timings here to satisfy
1998          * the NIST-PCTS.
1999          */
2000         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2001         char_time = char_time / 5;
2002         if (char_time == 0)
2003                 char_time = 1;
2004         if (timeout && timeout < char_time)
2005                 char_time = timeout;
2006         /*
2007          * If the transmitter hasn't cleared in twice the approximate
2008          * amount of time to send the entire FIFO, it probably won't
2009          * ever clear.  This assumes the UART isn't doing flow
2010          * control, which is currently the case.  Hence, if it ever
2011          * takes longer than info->timeout, this is probably due to a
2012          * UART bug of some kind.  So, we clamp the timeout parameter at
2013          * 2*info->timeout.
2014          */
2015         if (!timeout || timeout > 2 * info->timeout)
2016                 timeout = 2 * info->timeout;
2017
2018         spin_lock_irqsave(&info->slock, flags);
2019         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2020                 spin_unlock_irqrestore(&info->slock, flags);
2021                 schedule_timeout_interruptible(char_time);
2022                 spin_lock_irqsave(&info->slock, flags);
2023                 if (signal_pending(current))
2024                         break;
2025                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2026                         break;
2027         }
2028         spin_unlock_irqrestore(&info->slock, flags);
2029         set_current_state(TASK_RUNNING);
2030 }
2031
2032 /*
2033  * This routine is called by tty_hangup() when a hangup is signaled.
2034  */
2035 static void mxser_hangup(struct tty_struct *tty)
2036 {
2037         struct mxser_port *info = tty->driver_data;
2038
2039         mxser_flush_buffer(tty);
2040         tty_port_hangup(&info->port);
2041 }
2042
2043 /*
2044  * mxser_rs_break() --- routine which turns the break handling on or off
2045  */
2046 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2047 {
2048         struct mxser_port *info = tty->driver_data;
2049         unsigned long flags;
2050
2051         spin_lock_irqsave(&info->slock, flags);
2052         if (break_state == -1)
2053                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2054                         info->ioaddr + UART_LCR);
2055         else
2056                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2057                         info->ioaddr + UART_LCR);
2058         spin_unlock_irqrestore(&info->slock, flags);
2059         return 0;
2060 }
2061
2062 static void mxser_receive_chars(struct tty_struct *tty,
2063                                 struct mxser_port *port, int *status)
2064 {
2065         unsigned char ch, gdl;
2066         int ignored = 0;
2067         int cnt = 0;
2068         int recv_room;
2069         int max = 256;
2070
2071         recv_room = tty->receive_room;
2072         if (recv_room == 0 && !port->ldisc_stop_rx)
2073                 mxser_stoprx(tty);
2074         if (port->board->chip_flag != MOXA_OTHER_UART) {
2075
2076                 if (*status & UART_LSR_SPECIAL)
2077                         goto intr_old;
2078                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2079                                 (*status & MOXA_MUST_LSR_RERR))
2080                         goto intr_old;
2081                 if (*status & MOXA_MUST_LSR_RERR)
2082                         goto intr_old;
2083
2084                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2085
2086                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2087                         gdl &= MOXA_MUST_GDL_MASK;
2088                 if (gdl >= recv_room) {
2089                         if (!port->ldisc_stop_rx)
2090                                 mxser_stoprx(tty);
2091                 }
2092                 while (gdl--) {
2093                         ch = inb(port->ioaddr + UART_RX);
2094                         tty_insert_flip_char(&port->port, ch, 0);
2095                         cnt++;
2096                 }
2097                 goto end_intr;
2098         }
2099 intr_old:
2100
2101         do {
2102                 if (max-- < 0)
2103                         break;
2104
2105                 ch = inb(port->ioaddr + UART_RX);
2106                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2107                         outb(0x23, port->ioaddr + UART_FCR);
2108                 *status &= port->read_status_mask;
2109                 if (*status & port->ignore_status_mask) {
2110                         if (++ignored > 100)
2111                                 break;
2112                 } else {
2113                         char flag = 0;
2114                         if (*status & UART_LSR_SPECIAL) {
2115                                 if (*status & UART_LSR_BI) {
2116                                         flag = TTY_BREAK;
2117                                         port->icount.brk++;
2118
2119                                         if (port->port.flags & ASYNC_SAK)
2120                                                 do_SAK(tty);
2121                                 } else if (*status & UART_LSR_PE) {
2122                                         flag = TTY_PARITY;
2123                                         port->icount.parity++;
2124                                 } else if (*status & UART_LSR_FE) {
2125                                         flag = TTY_FRAME;
2126                                         port->icount.frame++;
2127                                 } else if (*status & UART_LSR_OE) {
2128                                         flag = TTY_OVERRUN;
2129                                         port->icount.overrun++;
2130                                 } else
2131                                         flag = TTY_BREAK;
2132                         }
2133                         tty_insert_flip_char(&port->port, ch, flag);
2134                         cnt++;
2135                         if (cnt >= recv_room) {
2136                                 if (!port->ldisc_stop_rx)
2137                                         mxser_stoprx(tty);
2138                                 break;
2139                         }
2140
2141                 }
2142
2143                 if (port->board->chip_flag)
2144                         break;
2145
2146                 *status = inb(port->ioaddr + UART_LSR);
2147         } while (*status & UART_LSR_DR);
2148
2149 end_intr:
2150         mxvar_log.rxcnt[tty->index] += cnt;
2151         port->mon_data.rxcnt += cnt;
2152         port->mon_data.up_rxcnt += cnt;
2153
2154         /*
2155          * We are called from an interrupt context with &port->slock
2156          * being held. Drop it temporarily in order to prevent
2157          * recursive locking.
2158          */
2159         spin_unlock(&port->slock);
2160         tty_flip_buffer_push(&port->port);
2161         spin_lock(&port->slock);
2162 }
2163
2164 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2165 {
2166         int count, cnt;
2167
2168         if (port->x_char) {
2169                 outb(port->x_char, port->ioaddr + UART_TX);
2170                 port->x_char = 0;
2171                 mxvar_log.txcnt[tty->index]++;
2172                 port->mon_data.txcnt++;
2173                 port->mon_data.up_txcnt++;
2174                 port->icount.tx++;
2175                 return;
2176         }
2177
2178         if (port->port.xmit_buf == NULL)
2179                 return;
2180
2181         if (port->xmit_cnt <= 0 || tty->stopped ||
2182                         (tty->hw_stopped &&
2183                         (port->type != PORT_16550A) &&
2184                         (!port->board->chip_flag))) {
2185                 port->IER &= ~UART_IER_THRI;
2186                 outb(port->IER, port->ioaddr + UART_IER);
2187                 return;
2188         }
2189
2190         cnt = port->xmit_cnt;
2191         count = port->xmit_fifo_size;
2192         do {
2193                 outb(port->port.xmit_buf[port->xmit_tail++],
2194                         port->ioaddr + UART_TX);
2195                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2196                 if (--port->xmit_cnt <= 0)
2197                         break;
2198         } while (--count > 0);
2199         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2200
2201         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2202         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2203         port->icount.tx += (cnt - port->xmit_cnt);
2204
2205         if (port->xmit_cnt < WAKEUP_CHARS)
2206                 tty_wakeup(tty);
2207
2208         if (port->xmit_cnt <= 0) {
2209                 port->IER &= ~UART_IER_THRI;
2210                 outb(port->IER, port->ioaddr + UART_IER);
2211         }
2212 }
2213
2214 /*
2215  * This is the serial driver's generic interrupt routine
2216  */
2217 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2218 {
2219         int status, iir, i;
2220         struct mxser_board *brd = NULL;
2221         struct mxser_port *port;
2222         int max, irqbits, bits, msr;
2223         unsigned int int_cnt, pass_counter = 0;
2224         int handled = IRQ_NONE;
2225         struct tty_struct *tty;
2226
2227         for (i = 0; i < MXSER_BOARDS; i++)
2228                 if (dev_id == &mxser_boards[i]) {
2229                         brd = dev_id;
2230                         break;
2231                 }
2232
2233         if (i == MXSER_BOARDS)
2234                 goto irq_stop;
2235         if (brd == NULL)
2236                 goto irq_stop;
2237         max = brd->info->nports;
2238         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2239                 irqbits = inb(brd->vector) & brd->vector_mask;
2240                 if (irqbits == brd->vector_mask)
2241                         break;
2242
2243                 handled = IRQ_HANDLED;
2244                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2245                         if (irqbits == brd->vector_mask)
2246                                 break;
2247                         if (bits & irqbits)
2248                                 continue;
2249                         port = &brd->ports[i];
2250
2251                         int_cnt = 0;
2252                         spin_lock(&port->slock);
2253                         do {
2254                                 iir = inb(port->ioaddr + UART_IIR);
2255                                 if (iir & UART_IIR_NO_INT)
2256                                         break;
2257                                 iir &= MOXA_MUST_IIR_MASK;
2258                                 tty = tty_port_tty_get(&port->port);
2259                                 if (!tty || port->closing ||
2260                                     !(port->port.flags & ASYNC_INITIALIZED)) {
2261                                         status = inb(port->ioaddr + UART_LSR);
2262                                         outb(0x27, port->ioaddr + UART_FCR);
2263                                         inb(port->ioaddr + UART_MSR);
2264                                         tty_kref_put(tty);
2265                                         break;
2266                                 }
2267
2268                                 status = inb(port->ioaddr + UART_LSR);
2269
2270                                 if (status & UART_LSR_PE)
2271                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2272                                 if (status & UART_LSR_FE)
2273                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2274                                 if (status & UART_LSR_OE)
2275                                         port->err_shadow |=
2276                                                 NPPI_NOTIFY_HW_OVERRUN;
2277                                 if (status & UART_LSR_BI)
2278                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2279
2280                                 if (port->board->chip_flag) {
2281                                         if (iir == MOXA_MUST_IIR_GDA ||
2282                                             iir == MOXA_MUST_IIR_RDA ||
2283                                             iir == MOXA_MUST_IIR_RTO ||
2284                                             iir == MOXA_MUST_IIR_LSR)
2285                                                 mxser_receive_chars(tty, port,
2286                                                                 &status);
2287
2288                                 } else {
2289                                         status &= port->read_status_mask;
2290                                         if (status & UART_LSR_DR)
2291                                                 mxser_receive_chars(tty, port,
2292                                                                 &status);
2293                                 }
2294                                 msr = inb(port->ioaddr + UART_MSR);
2295                                 if (msr & UART_MSR_ANY_DELTA)
2296                                         mxser_check_modem_status(tty, port, msr);
2297
2298                                 if (port->board->chip_flag) {
2299                                         if (iir == 0x02 && (status &
2300                                                                 UART_LSR_THRE))
2301                                                 mxser_transmit_chars(tty, port);
2302                                 } else {
2303                                         if (status & UART_LSR_THRE)
2304                                                 mxser_transmit_chars(tty, port);
2305                                 }
2306                                 tty_kref_put(tty);
2307                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2308                         spin_unlock(&port->slock);
2309                 }
2310         }
2311
2312 irq_stop:
2313         return handled;
2314 }
2315
2316 static const struct tty_operations mxser_ops = {
2317         .open = mxser_open,
2318         .close = mxser_close,
2319         .write = mxser_write,
2320         .put_char = mxser_put_char,
2321         .flush_chars = mxser_flush_chars,
2322         .write_room = mxser_write_room,
2323         .chars_in_buffer = mxser_chars_in_buffer,
2324         .flush_buffer = mxser_flush_buffer,
2325         .ioctl = mxser_ioctl,
2326         .throttle = mxser_throttle,
2327         .unthrottle = mxser_unthrottle,
2328         .set_termios = mxser_set_termios,
2329         .stop = mxser_stop,
2330         .start = mxser_start,
2331         .hangup = mxser_hangup,
2332         .break_ctl = mxser_rs_break,
2333         .wait_until_sent = mxser_wait_until_sent,
2334         .tiocmget = mxser_tiocmget,
2335         .tiocmset = mxser_tiocmset,
2336         .get_icount = mxser_get_icount,
2337 };
2338
2339 static const struct tty_port_operations mxser_port_ops = {
2340         .carrier_raised = mxser_carrier_raised,
2341         .dtr_rts = mxser_dtr_rts,
2342         .activate = mxser_activate,
2343         .shutdown = mxser_shutdown_port,
2344 };
2345
2346 /*
2347  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2348  */
2349
2350 static bool allow_overlapping_vector;
2351 module_param(allow_overlapping_vector, bool, S_IRUGO);
2352 MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2353
2354 static bool mxser_overlapping_vector(struct mxser_board *brd)
2355 {
2356         return allow_overlapping_vector &&
2357                 brd->vector >= brd->ports[0].ioaddr &&
2358                 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2359 }
2360
2361 static int mxser_request_vector(struct mxser_board *brd)
2362 {
2363         if (mxser_overlapping_vector(brd))
2364                 return 0;
2365         return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2366 }
2367
2368 static void mxser_release_vector(struct mxser_board *brd)
2369 {
2370         if (mxser_overlapping_vector(brd))
2371                 return;
2372         release_region(brd->vector, 1);
2373 }
2374
2375 static void mxser_release_ISA_res(struct mxser_board *brd)
2376 {
2377         release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2378         mxser_release_vector(brd);
2379 }
2380
2381 static int mxser_initbrd(struct mxser_board *brd,
2382                 struct pci_dev *pdev)
2383 {
2384         struct mxser_port *info;
2385         unsigned int i;
2386         int retval;
2387
2388         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2389                         brd->ports[0].max_baud);
2390
2391         for (i = 0; i < brd->info->nports; i++) {
2392                 info = &brd->ports[i];
2393                 tty_port_init(&info->port);
2394                 info->port.ops = &mxser_port_ops;
2395                 info->board = brd;
2396                 info->stop_rx = 0;
2397                 info->ldisc_stop_rx = 0;
2398
2399                 /* Enhance mode enabled here */
2400                 if (brd->chip_flag != MOXA_OTHER_UART)
2401                         mxser_enable_must_enchance_mode(info->ioaddr);
2402
2403                 info->port.flags = ASYNC_SHARE_IRQ;
2404                 info->type = brd->uart_type;
2405
2406                 process_txrx_fifo(info);
2407
2408                 info->custom_divisor = info->baud_base * 16;
2409                 info->port.close_delay = 5 * HZ / 10;
2410                 info->port.closing_wait = 30 * HZ;
2411                 info->normal_termios = mxvar_sdriver->init_termios;
2412                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2413                 info->err_shadow = 0;
2414                 spin_lock_init(&info->slock);
2415
2416                 /* before set INT ISR, disable all int */
2417                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2418                         info->ioaddr + UART_IER);
2419         }
2420
2421         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2422                         brd);
2423         if (retval) {
2424                 for (i = 0; i < brd->info->nports; i++)
2425                         tty_port_destroy(&brd->ports[i].port);
2426                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2427                         "conflict with another device.\n",
2428                         brd->info->name, brd->irq);
2429         }
2430
2431         return retval;
2432 }
2433
2434 static void mxser_board_remove(struct mxser_board *brd)
2435 {
2436         unsigned int i;
2437
2438         for (i = 0; i < brd->info->nports; i++) {
2439                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2440                 tty_port_destroy(&brd->ports[i].port);
2441         }
2442         free_irq(brd->irq, brd);
2443 }
2444
2445 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2446 {
2447         int id, i, bits, ret;
2448         unsigned short regs[16], irq;
2449         unsigned char scratch, scratch2;
2450
2451         brd->chip_flag = MOXA_OTHER_UART;
2452
2453         id = mxser_read_register(cap, regs);
2454         switch (id) {
2455         case C168_ASIC_ID:
2456                 brd->info = &mxser_cards[0];
2457                 break;
2458         case C104_ASIC_ID:
2459                 brd->info = &mxser_cards[1];
2460                 break;
2461         case CI104J_ASIC_ID:
2462                 brd->info = &mxser_cards[2];
2463                 break;
2464         case C102_ASIC_ID:
2465                 brd->info = &mxser_cards[5];
2466                 break;
2467         case CI132_ASIC_ID:
2468                 brd->info = &mxser_cards[6];
2469                 break;
2470         case CI134_ASIC_ID:
2471                 brd->info = &mxser_cards[7];
2472                 break;
2473         default:
2474                 return 0;
2475         }
2476
2477         irq = 0;
2478         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2479            Flag-hack checks if configuration should be read as 2-port here. */
2480         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2481                 irq = regs[9] & 0xF000;
2482                 irq = irq | (irq >> 4);
2483                 if (irq != (regs[9] & 0xFF00))
2484                         goto err_irqconflict;
2485         } else if (brd->info->nports == 4) {
2486                 irq = regs[9] & 0xF000;
2487                 irq = irq | (irq >> 4);
2488                 irq = irq | (irq >> 8);
2489                 if (irq != regs[9])
2490                         goto err_irqconflict;
2491         } else if (brd->info->nports == 8) {
2492                 irq = regs[9] & 0xF000;
2493                 irq = irq | (irq >> 4);
2494                 irq = irq | (irq >> 8);
2495                 if ((irq != regs[9]) || (irq != regs[10]))
2496                         goto err_irqconflict;
2497         }
2498
2499         if (!irq) {
2500                 printk(KERN_ERR "mxser: interrupt number unset\n");
2501                 return -EIO;
2502         }
2503         brd->irq = ((int)(irq & 0xF000) >> 12);
2504         for (i = 0; i < 8; i++)
2505                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2506         if ((regs[12] & 0x80) == 0) {
2507                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2508                 return -EIO;
2509         }
2510         brd->vector = (int)regs[11];    /* interrupt vector */
2511         if (id == 1)
2512                 brd->vector_mask = 0x00FF;
2513         else
2514                 brd->vector_mask = 0x000F;
2515         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2516                 if (regs[12] & bits) {
2517                         brd->ports[i].baud_base = 921600;
2518                         brd->ports[i].max_baud = 921600;
2519                 } else {
2520                         brd->ports[i].baud_base = 115200;
2521                         brd->ports[i].max_baud = 115200;
2522                 }
2523         }
2524         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2525         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2526         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2527         outb(scratch2, cap + UART_LCR);
2528         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2529         scratch = inb(cap + UART_IIR);
2530
2531         if (scratch & 0xC0)
2532                 brd->uart_type = PORT_16550A;
2533         else
2534                 brd->uart_type = PORT_16450;
2535         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2536                         "mxser(IO)")) {
2537                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2538                                 "0x%.8lx-0x%.8lx\n",
2539                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2540                                 8 * brd->info->nports - 1);
2541                 return -EIO;
2542         }
2543
2544         ret = mxser_request_vector(brd);
2545         if (ret) {
2546                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2547                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2548                                 "0x%.8lx-0x%.8lx\n",
2549                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2550                                 8 * brd->info->nports - 1);
2551                 return ret;
2552         }
2553         return brd->info->nports;
2554
2555 err_irqconflict:
2556         printk(KERN_ERR "mxser: invalid interrupt number\n");
2557         return -EIO;
2558 }
2559
2560 static int mxser_probe(struct pci_dev *pdev,
2561                 const struct pci_device_id *ent)
2562 {
2563 #ifdef CONFIG_PCI
2564         struct mxser_board *brd;
2565         unsigned int i, j;
2566         unsigned long ioaddress;
2567         struct device *tty_dev;
2568         int retval = -EINVAL;
2569
2570         for (i = 0; i < MXSER_BOARDS; i++)
2571                 if (mxser_boards[i].info == NULL)
2572                         break;
2573
2574         if (i >= MXSER_BOARDS) {
2575                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2576                                 "not configured\n", MXSER_BOARDS);
2577                 goto err;
2578         }
2579
2580         brd = &mxser_boards[i];
2581         brd->idx = i * MXSER_PORTS_PER_BOARD;
2582         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2583                 mxser_cards[ent->driver_data].name,
2584                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2585
2586         retval = pci_enable_device(pdev);
2587         if (retval) {
2588                 dev_err(&pdev->dev, "PCI enable failed\n");
2589                 goto err;
2590         }
2591
2592         /* io address */
2593         ioaddress = pci_resource_start(pdev, 2);
2594         retval = pci_request_region(pdev, 2, "mxser(IO)");
2595         if (retval)
2596                 goto err_dis;
2597
2598         brd->info = &mxser_cards[ent->driver_data];
2599         for (i = 0; i < brd->info->nports; i++)
2600                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2601
2602         /* vector */
2603         ioaddress = pci_resource_start(pdev, 3);
2604         retval = pci_request_region(pdev, 3, "mxser(vector)");
2605         if (retval)
2606                 goto err_zero;
2607         brd->vector = ioaddress;
2608
2609         /* irq */
2610         brd->irq = pdev->irq;
2611
2612         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2613         brd->uart_type = PORT_16550A;
2614         brd->vector_mask = 0;
2615
2616         for (i = 0; i < brd->info->nports; i++) {
2617                 for (j = 0; j < UART_INFO_NUM; j++) {
2618                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2619                                 brd->ports[i].max_baud =
2620                                         Gpci_uart_info[j].max_baud;
2621
2622                                 /* exception....CP-102 */
2623                                 if (brd->info->flags & MXSER_HIGHBAUD)
2624                                         brd->ports[i].max_baud = 921600;
2625                                 break;
2626                         }
2627                 }
2628         }
2629
2630         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2631                 for (i = 0; i < brd->info->nports; i++) {
2632                         if (i < 4)
2633                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2634                         else
2635                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2636                 }
2637                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2638                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2639         }
2640
2641         for (i = 0; i < brd->info->nports; i++) {
2642                 brd->vector_mask |= (1 << i);
2643                 brd->ports[i].baud_base = 921600;
2644         }
2645
2646         /* mxser_initbrd will hook ISR. */
2647         retval = mxser_initbrd(brd, pdev);
2648         if (retval)
2649                 goto err_rel3;
2650
2651         for (i = 0; i < brd->info->nports; i++) {
2652                 tty_dev = tty_port_register_device(&brd->ports[i].port,
2653                                 mxvar_sdriver, brd->idx + i, &pdev->dev);
2654                 if (IS_ERR(tty_dev)) {
2655                         retval = PTR_ERR(tty_dev);
2656                         for (; i > 0; i--)
2657                                 tty_unregister_device(mxvar_sdriver,
2658                                         brd->idx + i - 1);
2659                         goto err_relbrd;
2660                 }
2661         }
2662
2663         pci_set_drvdata(pdev, brd);
2664
2665         return 0;
2666 err_relbrd:
2667         for (i = 0; i < brd->info->nports; i++)
2668                 tty_port_destroy(&brd->ports[i].port);
2669         free_irq(brd->irq, brd);
2670 err_rel3:
2671         pci_release_region(pdev, 3);
2672 err_zero:
2673         brd->info = NULL;
2674         pci_release_region(pdev, 2);
2675 err_dis:
2676         pci_disable_device(pdev);
2677 err:
2678         return retval;
2679 #else
2680         return -ENODEV;
2681 #endif
2682 }
2683
2684 static void mxser_remove(struct pci_dev *pdev)
2685 {
2686 #ifdef CONFIG_PCI
2687         struct mxser_board *brd = pci_get_drvdata(pdev);
2688
2689         mxser_board_remove(brd);
2690
2691         pci_release_region(pdev, 2);
2692         pci_release_region(pdev, 3);
2693         pci_disable_device(pdev);
2694         brd->info = NULL;
2695 #endif
2696 }
2697
2698 static struct pci_driver mxser_driver = {
2699         .name = "mxser",
2700         .id_table = mxser_pcibrds,
2701         .probe = mxser_probe,
2702         .remove = mxser_remove
2703 };
2704
2705 static int __init mxser_module_init(void)
2706 {
2707         struct mxser_board *brd;
2708         struct device *tty_dev;
2709         unsigned int b, i, m;
2710         int retval;
2711
2712         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2713         if (!mxvar_sdriver)
2714                 return -ENOMEM;
2715
2716         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2717                 MXSER_VERSION);
2718
2719         /* Initialize the tty_driver structure */
2720         mxvar_sdriver->name = "ttyMI";
2721         mxvar_sdriver->major = ttymajor;
2722         mxvar_sdriver->minor_start = 0;
2723         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2724         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2725         mxvar_sdriver->init_termios = tty_std_termios;
2726         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2727         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2728         tty_set_operations(mxvar_sdriver, &mxser_ops);
2729
2730         retval = tty_register_driver(mxvar_sdriver);
2731         if (retval) {
2732                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2733                                 "tty driver !\n");
2734                 goto err_put;
2735         }
2736
2737         /* Start finding ISA boards here */
2738         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2739                 if (!ioaddr[b])
2740                         continue;
2741
2742                 brd = &mxser_boards[m];
2743                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2744                 if (retval <= 0) {
2745                         brd->info = NULL;
2746                         continue;
2747                 }
2748
2749                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2750                                 brd->info->name, ioaddr[b]);
2751
2752                 /* mxser_initbrd will hook ISR. */
2753                 if (mxser_initbrd(brd, NULL) < 0) {
2754                         mxser_release_ISA_res(brd);
2755                         brd->info = NULL;
2756                         continue;
2757                 }
2758
2759                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2760                 for (i = 0; i < brd->info->nports; i++) {
2761                         tty_dev = tty_port_register_device(&brd->ports[i].port,
2762                                         mxvar_sdriver, brd->idx + i, NULL);
2763                         if (IS_ERR(tty_dev)) {
2764                                 for (; i > 0; i--)
2765                                         tty_unregister_device(mxvar_sdriver,
2766                                                 brd->idx + i - 1);
2767                                 for (i = 0; i < brd->info->nports; i++)
2768                                         tty_port_destroy(&brd->ports[i].port);
2769                                 free_irq(brd->irq, brd);
2770                                 mxser_release_ISA_res(brd);
2771                                 brd->info = NULL;
2772                                 break;
2773                         }
2774                 }
2775                 if (brd->info == NULL)
2776                         continue;
2777
2778                 m++;
2779         }
2780
2781         retval = pci_register_driver(&mxser_driver);
2782         if (retval) {
2783                 printk(KERN_ERR "mxser: can't register pci driver\n");
2784                 if (!m) {
2785                         retval = -ENODEV;
2786                         goto err_unr;
2787                 } /* else: we have some ISA cards under control */
2788         }
2789
2790         return 0;
2791 err_unr:
2792         tty_unregister_driver(mxvar_sdriver);
2793 err_put:
2794         put_tty_driver(mxvar_sdriver);
2795         return retval;
2796 }
2797
2798 static void __exit mxser_module_exit(void)
2799 {
2800         unsigned int i;
2801
2802         pci_unregister_driver(&mxser_driver);
2803
2804         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2805                 if (mxser_boards[i].info != NULL)
2806                         mxser_board_remove(&mxser_boards[i]);
2807         tty_unregister_driver(mxvar_sdriver);
2808         put_tty_driver(mxvar_sdriver);
2809
2810         for (i = 0; i < MXSER_BOARDS; i++)
2811                 if (mxser_boards[i].info != NULL)
2812                         mxser_release_ISA_res(&mxser_boards[i]);
2813 }
2814
2815 module_init(mxser_module_init);
2816 module_exit(mxser_module_exit);