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