drivers/tty/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
  18  *      www.moxa.com.
  19  *      - Fixed x86_64 cleanness
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/serial.h>
  31 #include <linux/serial_reg.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/ioport.h>
  37 #include <linux/mm.h>
  38 #include <linux/delay.h>
  39 #include <linux/pci.h>
  40 #include <linux/bitops.h>
  41 #include <linux/slab.h>
  42 #include <linux/ratelimit.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.5"         /* 1.14 */
  51 #define MXSERMAJOR       174
  52
  53 #define MXSER_BOARDS            4       /* Max. boards */
  54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  56 #define MXSER_ISR_PASS_LIMIT    100
  57
  58 /*CheckIsMoxaMust return value*/
  59 #define MOXA_OTHER_UART         0x00
  60 #define MOXA_MUST_MU150_HWID    0x01
  61 #define MOXA_MUST_MU860_HWID    0x02
  62
  63 #define WAKEUP_CHARS            256
  64
  65 #define UART_MCR_AFE            0x20
  66 #define UART_LSR_SPECIAL        0x1E
  67
  68 #define PCI_DEVICE_ID_POS104UL  0x1044
  69 #define PCI_DEVICE_ID_CB108     0x1080
  70 #define PCI_DEVICE_ID_CP102UF   0x1023
  71 #define PCI_DEVICE_ID_CP112UL   0x1120
  72 #define PCI_DEVICE_ID_CB114     0x1142
  73 #define PCI_DEVICE_ID_CP114UL   0x1143
  74 #define PCI_DEVICE_ID_CB134I    0x1341
  75 #define PCI_DEVICE_ID_CP138U    0x1380
  76
  77
  78 #define C168_ASIC_ID    1
  79 #define C104_ASIC_ID    2
  80 #define C102_ASIC_ID    0xB
  81 #define CI132_ASIC_ID   4
  82 #define CI134_ASIC_ID   3
  83 #define CI104J_ASIC_ID  5
  84
  85 #define MXSER_HIGHBAUD  1
  86 #define MXSER_HAS2      2
  87
  88 /* This is only for PCI */
  89 static const struct {
  90         int type;
  91         int tx_fifo;
  92         int rx_fifo;
  93         int xmit_fifo_size;
  94         int rx_high_water;
  95         int rx_trigger;
  96         int rx_low_water;
  97         long max_baud;
  98 } Gpci_uart_info[] = {
  99         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 100         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 101         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 102 };
 103 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 104
 105 struct mxser_cardinfo {
 106         char *name;
 107         unsigned int nports;
 108         unsigned int flags;
 109 };
 110
 111 static const struct mxser_cardinfo mxser_cards[] = {
 112 /* 0*/  { "C168 series",        8, },
 113         { "C104 series",        4, },
 114         { "CI-104J series",     4, },
 115         { "C168H/PCI series",   8, },
 116         { "C104H/PCI series",   4, },
 117 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 118         { "CI-132 series",      4, MXSER_HAS2 },
 119         { "CI-134 series",      4, },
 120         { "CP-132 series",      2, },
 121         { "CP-114 series",      4, },
 122 /*10*/  { "CT-114 series",      4, },
 123         { "CP-102 series",      2, MXSER_HIGHBAUD },
 124         { "CP-104U series",     4, },
 125         { "CP-168U series",     8, },
 126         { "CP-132U series",     2, },
 127 /*15*/  { "CP-134U series",     4, },
 128         { "CP-104JU series",    4, },
 129         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 130         { "CP-118U series",     8, },
 131         { "CP-102UL series",    2, },
 132 /*20*/  { "CP-102U series",     2, },
 133         { "CP-118EL series",    8, },
 134         { "CP-168EL series",    8, },
 135         { "CP-104EL series",    4, },
 136         { "CB-108 series",      8, },
 137 /*25*/  { "CB-114 series",      4, },
 138         { "CB-134I series",     4, },
 139         { "CP-138U series",     8, },
 140         { "POS-104UL series",   4, },
 141         { "CP-114UL series",    4, },
 142 /*30*/  { "CP-102UF series",    2, },
 143         { "CP-112UL series",    2, },
 144 };
 145
 146 /* driver_data correspond to the lines in the structure above
 147    see also ISA probe function before you change something */
 148 static struct pci_device_id mxser_pcibrds[] = {
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),     .driver_data = 31 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 178
 179 static unsigned long ioaddr[MXSER_BOARDS];
 180 static int ttymajor = MXSERMAJOR;
 181
 182 /* Variables for insmod */
 183
 184 MODULE_AUTHOR("Casper Yang");
 185 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 186 module_param_array(ioaddr, ulong, NULL, 0);
 187 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 188 module_param(ttymajor, int, 0);
 189 MODULE_LICENSE("GPL");
 190
 191 struct mxser_log {
 192         int tick;
 193         unsigned long rxcnt[MXSER_PORTS];
 194         unsigned long txcnt[MXSER_PORTS];
 195 };
 196
 197 struct mxser_mon {
 198         unsigned long rxcnt;
 199         unsigned long txcnt;
 200         unsigned long up_rxcnt;
 201         unsigned long up_txcnt;
 202         int modem_status;
 203         unsigned char hold_reason;
 204 };
 205
 206 struct mxser_mon_ext {
 207         unsigned long rx_cnt[32];
 208         unsigned long tx_cnt[32];
 209         unsigned long up_rxcnt[32];
 210         unsigned long up_txcnt[32];
 211         int modem_status[32];
 212
 213         long baudrate[32];
 214         int databits[32];
 215         int stopbits[32];
 216         int parity[32];
 217         int flowctrl[32];
 218         int fifo[32];
 219         int iftype[32];
 220 };
 221
 222 struct mxser_board;
 223
 224 struct mxser_port {
 225         struct tty_port port;
 226         struct mxser_board *board;
 227
 228         unsigned long ioaddr;
 229         unsigned long opmode_ioaddr;
 230         int max_baud;
 231
 232         int rx_high_water;
 233         int rx_trigger;         /* Rx fifo trigger level */
 234         int rx_low_water;
 235         int baud_base;          /* max. speed */
 236         int type;               /* UART type */
 237
 238         int x_char;             /* xon/xoff character */
 239         int IER;                /* Interrupt Enable Register */
 240         int MCR;                /* Modem control register */
 241
 242         unsigned char stop_rx;
 243         unsigned char ldisc_stop_rx;
 244
 245         int custom_divisor;
 246         unsigned char err_shadow;
 247
 248         struct async_icount icount; /* kernel counters for 4 input interrupts */
 249         int timeout;
 250
 251         int read_status_mask;
 252         int ignore_status_mask;
 253         int xmit_fifo_size;
 254         int xmit_head;
 255         int xmit_tail;
 256         int xmit_cnt;
 257         int closing;
 258
 259         struct ktermios normal_termios;
 260
 261         struct mxser_mon mon_data;
 262
 263         spinlock_t slock;
 264 };
 265
 266 struct mxser_board {
 267         unsigned int idx;
 268         int irq;
 269         const struct mxser_cardinfo *info;
 270         unsigned long vector;
 271         unsigned long vector_mask;
 272
 273         int chip_flag;
 274         int uart_type;
 275
 276         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 277 };
 278
 279 struct mxser_mstatus {
 280         tcflag_t cflag;
 281         int cts;
 282         int dsr;
 283         int ri;
 284         int dcd;
 285 };
 286
 287 static struct mxser_board mxser_boards[MXSER_BOARDS];
 288 static struct tty_driver *mxvar_sdriver;
 289 static struct mxser_log mxvar_log;
 290 static int mxser_set_baud_method[MXSER_PORTS + 1];
 291
 292 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 293 {
 294         u8 oldlcr;
 295         u8 efr;
 296
 297         oldlcr = inb(baseio + UART_LCR);
 298         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 299
 300         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 301         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 302
 303         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 304         outb(oldlcr, baseio + UART_LCR);
 305 }
 306
 307 #ifdef  CONFIG_PCI
 308 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 309 {
 310         u8 oldlcr;
 311         u8 efr;
 312
 313         oldlcr = inb(baseio + UART_LCR);
 314         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 315
 316         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 317         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 318
 319         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 320         outb(oldlcr, baseio + UART_LCR);
 321 }
 322 #endif
 323
 324 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 325 {
 326         u8 oldlcr;
 327         u8 efr;
 328
 329         oldlcr = inb(baseio + UART_LCR);
 330         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 331
 332         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 333         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 334         efr |= MOXA_MUST_EFR_BANK0;
 335
 336         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 337         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 338         outb(oldlcr, baseio + UART_LCR);
 339 }
 340
 341 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 342 {
 343         u8 oldlcr;
 344         u8 efr;
 345
 346         oldlcr = inb(baseio + UART_LCR);
 347         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 348
 349         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 350         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 351         efr |= MOXA_MUST_EFR_BANK0;
 352
 353         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 354         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 355         outb(oldlcr, baseio + UART_LCR);
 356 }
 357
 358 static void mxser_set_must_fifo_value(struct mxser_port *info)
 359 {
 360         u8 oldlcr;
 361         u8 efr;
 362
 363         oldlcr = inb(info->ioaddr + UART_LCR);
 364         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 365
 366         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 367         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 368         efr |= MOXA_MUST_EFR_BANK1;
 369
 370         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 371         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 372         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 373         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 374         outb(oldlcr, info->ioaddr + UART_LCR);
 375 }
 376
 377 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 378 {
 379         u8 oldlcr;
 380         u8 efr;
 381
 382         oldlcr = inb(baseio + UART_LCR);
 383         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 384
 385         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 386         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 387         efr |= MOXA_MUST_EFR_BANK2;
 388
 389         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 390         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 391         outb(oldlcr, baseio + UART_LCR);
 392 }
 393
 394 #ifdef CONFIG_PCI
 395 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 396 {
 397         u8 oldlcr;
 398         u8 efr;
 399
 400         oldlcr = inb(baseio + UART_LCR);
 401         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 402
 403         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 404         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 405         efr |= MOXA_MUST_EFR_BANK2;
 406
 407         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 408         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 409         outb(oldlcr, baseio + UART_LCR);
 410 }
 411 #endif
 412
 413 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 414 {
 415         u8 oldlcr;
 416         u8 efr;
 417
 418         oldlcr = inb(baseio + UART_LCR);
 419         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 420
 421         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 422         efr &= ~MOXA_MUST_EFR_SF_MASK;
 423
 424         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 425         outb(oldlcr, baseio + UART_LCR);
 426 }
 427
 428 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 429 {
 430         u8 oldlcr;
 431         u8 efr;
 432
 433         oldlcr = inb(baseio + UART_LCR);
 434         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 435
 436         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 437         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 438         efr |= MOXA_MUST_EFR_SF_TX1;
 439
 440         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 441         outb(oldlcr, baseio + UART_LCR);
 442 }
 443
 444 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 445 {
 446         u8 oldlcr;
 447         u8 efr;
 448
 449         oldlcr = inb(baseio + UART_LCR);
 450         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 451
 452         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 453         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 454
 455         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 456         outb(oldlcr, baseio + UART_LCR);
 457 }
 458
 459 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 460 {
 461         u8 oldlcr;
 462         u8 efr;
 463
 464         oldlcr = inb(baseio + UART_LCR);
 465         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 466
 467         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 468         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 469         efr |= MOXA_MUST_EFR_SF_RX1;
 470
 471         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 472         outb(oldlcr, baseio + UART_LCR);
 473 }
 474
 475 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 476 {
 477         u8 oldlcr;
 478         u8 efr;
 479
 480         oldlcr = inb(baseio + UART_LCR);
 481         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 482
 483         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 484         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 485
 486         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 487         outb(oldlcr, baseio + UART_LCR);
 488 }
 489
 490 #ifdef CONFIG_PCI
 491 static int CheckIsMoxaMust(unsigned long io)
 492 {
 493         u8 oldmcr, hwid;
 494         int i;
 495
 496         outb(0, io + UART_LCR);
 497         mxser_disable_must_enchance_mode(io);
 498         oldmcr = inb(io + UART_MCR);
 499         outb(0, io + UART_MCR);
 500         mxser_set_must_xon1_value(io, 0x11);
 501         if ((hwid = inb(io + UART_MCR)) != 0) {
 502                 outb(oldmcr, io + UART_MCR);
 503                 return MOXA_OTHER_UART;
 504         }
 505
 506         mxser_get_must_hardware_id(io, &hwid);
 507         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 508                 if (hwid == Gpci_uart_info[i].type)
 509                         return (int)hwid;
 510         }
 511         return MOXA_OTHER_UART;
 512 }
 513 #endif
 514
 515 static void process_txrx_fifo(struct mxser_port *info)
 516 {
 517         int i;
 518
 519         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 520                 info->rx_trigger = 1;
 521                 info->rx_high_water = 1;
 522                 info->rx_low_water = 1;
 523                 info->xmit_fifo_size = 1;
 524         } else
 525                 for (i = 0; i < UART_INFO_NUM; i++)
 526                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 527                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 528                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 529                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 530                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 531                                 break;
 532                         }
 533 }
 534
 535 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 536 {
 537         static unsigned char mxser_msr[MXSER_PORTS + 1];
 538         unsigned char status = 0;
 539
 540         status = inb(baseaddr + UART_MSR);
 541
 542         mxser_msr[port] &= 0x0F;
 543         mxser_msr[port] |= status;
 544         status = mxser_msr[port];
 545         if (mode)
 546                 mxser_msr[port] = 0;
 547
 548         return status;
 549 }
 550
 551 static int mxser_carrier_raised(struct tty_port *port)
 552 {
 553         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 554         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
 555 }
 556
 557 static void mxser_dtr_rts(struct tty_port *port, int on)
 558 {
 559         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 560         unsigned long flags;
 561
 562         spin_lock_irqsave(&mp->slock, flags);
 563         if (on)
 564                 outb(inb(mp->ioaddr + UART_MCR) |
 565                         UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
 566         else
 567                 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
 568                         mp->ioaddr + UART_MCR);
 569         spin_unlock_irqrestore(&mp->slock, flags);
 570 }
 571
 572 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 573 {
 574         struct mxser_port *info = tty->driver_data;
 575         int quot = 0, baud;
 576         unsigned char cval;
 577
 578         if (!info->ioaddr)
 579                 return -1;
 580
 581         if (newspd > info->max_baud)
 582                 return -1;
 583
 584         if (newspd == 134) {
 585                 quot = 2 * info->baud_base / 269;
 586                 tty_encode_baud_rate(tty, 134, 134);
 587         } else if (newspd) {
 588                 quot = info->baud_base / newspd;
 589                 if (quot == 0)
 590                         quot = 1;
 591                 baud = info->baud_base/quot;
 592                 tty_encode_baud_rate(tty, baud, baud);
 593         } else {
 594                 quot = 0;
 595         }
 596
 597         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 598         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 599
 600         if (quot) {
 601                 info->MCR |= UART_MCR_DTR;
 602                 outb(info->MCR, info->ioaddr + UART_MCR);
 603         } else {
 604                 info->MCR &= ~UART_MCR_DTR;
 605                 outb(info->MCR, info->ioaddr + UART_MCR);
 606                 return 0;
 607         }
 608
 609         cval = inb(info->ioaddr + UART_LCR);
 610
 611         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 612
 613         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 614         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 615         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 616
 617 #ifdef BOTHER
 618         if (C_BAUD(tty) == BOTHER) {
 619                 quot = info->baud_base % newspd;
 620                 quot *= 8;
 621                 if (quot % newspd > newspd / 2) {
 622                         quot /= newspd;
 623                         quot++;
 624                 } else
 625                         quot /= newspd;
 626
 627                 mxser_set_must_enum_value(info->ioaddr, quot);
 628         } else
 629 #endif
 630                 mxser_set_must_enum_value(info->ioaddr, 0);
 631
 632         return 0;
 633 }
 634
 635 /*
 636  * This routine is called to set the UART divisor registers to match
 637  * the specified baud rate for a serial port.
 638  */
 639 static int mxser_change_speed(struct tty_struct *tty,
 640                                         struct ktermios *old_termios)
 641 {
 642         struct mxser_port *info = tty->driver_data;
 643         unsigned cflag, cval, fcr;
 644         int ret = 0;
 645         unsigned char status;
 646
 647         cflag = tty->termios.c_cflag;
 648         if (!info->ioaddr)
 649                 return ret;
 650
 651         if (mxser_set_baud_method[tty->index] == 0)
 652                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 653
 654         /* byte size and parity */
 655         switch (cflag & CSIZE) {
 656         case CS5:
 657                 cval = 0x00;
 658                 break;
 659         case CS6:
 660                 cval = 0x01;
 661                 break;
 662         case CS7:
 663                 cval = 0x02;
 664                 break;
 665         case CS8:
 666                 cval = 0x03;
 667                 break;
 668         default:
 669                 cval = 0x00;
 670                 break;          /* too keep GCC shut... */
 671         }
 672         if (cflag & CSTOPB)
 673                 cval |= 0x04;
 674         if (cflag & PARENB)
 675                 cval |= UART_LCR_PARITY;
 676         if (!(cflag & PARODD))
 677                 cval |= UART_LCR_EPAR;
 678         if (cflag & CMSPAR)
 679                 cval |= UART_LCR_SPAR;
 680
 681         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 682                 if (info->board->chip_flag) {
 683                         fcr = UART_FCR_ENABLE_FIFO;
 684                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 685                         mxser_set_must_fifo_value(info);
 686                 } else
 687                         fcr = 0;
 688         } else {
 689                 fcr = UART_FCR_ENABLE_FIFO;
 690                 if (info->board->chip_flag) {
 691                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 692                         mxser_set_must_fifo_value(info);
 693                 } else {
 694                         switch (info->rx_trigger) {
 695                         case 1:
 696                                 fcr |= UART_FCR_TRIGGER_1;
 697                                 break;
 698                         case 4:
 699                                 fcr |= UART_FCR_TRIGGER_4;
 700                                 break;
 701                         case 8:
 702                                 fcr |= UART_FCR_TRIGGER_8;
 703                                 break;
 704                         default:
 705                                 fcr |= UART_FCR_TRIGGER_14;
 706                                 break;
 707                         }
 708                 }
 709         }
 710
 711         /* CTS flow control flag and modem status interrupts */
 712         info->IER &= ~UART_IER_MSI;
 713         info->MCR &= ~UART_MCR_AFE;
 714         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
 715         if (cflag & CRTSCTS) {
 716                 info->IER |= UART_IER_MSI;
 717                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 718                         info->MCR |= UART_MCR_AFE;
 719                 } else {
 720                         status = inb(info->ioaddr + UART_MSR);
 721                         if (tty->hw_stopped) {
 722                                 if (status & UART_MSR_CTS) {
 723                                         tty->hw_stopped = 0;
 724                                         if (info->type != PORT_16550A &&
 725                                                         !info->board->chip_flag) {
 726                                                 outb(info->IER & ~UART_IER_THRI,
 727                                                         info->ioaddr +
 728                                                         UART_IER);
 729                                                 info->IER |= UART_IER_THRI;
 730                                                 outb(info->IER, info->ioaddr +
 731                                                                 UART_IER);
 732                                         }
 733                                         tty_wakeup(tty);
 734                                 }
 735                         } else {
 736                                 if (!(status & UART_MSR_CTS)) {
 737                                         tty->hw_stopped = 1;
 738                                         if ((info->type != PORT_16550A) &&
 739                                                         (!info->board->chip_flag)) {
 740                                                 info->IER &= ~UART_IER_THRI;
 741                                                 outb(info->IER, info->ioaddr +
 742                                                                 UART_IER);
 743                                         }
 744                                 }
 745                         }
 746                 }
 747         }
 748         outb(info->MCR, info->ioaddr + UART_MCR);
 749         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
 750         if (~cflag & CLOCAL)
 751                 info->IER |= UART_IER_MSI;
 752         outb(info->IER, info->ioaddr + UART_IER);
 753
 754         /*
 755          * Set up parity check flag
 756          */
 757         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 758         if (I_INPCK(tty))
 759                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 760         if (I_BRKINT(tty) || I_PARMRK(tty))
 761                 info->read_status_mask |= UART_LSR_BI;
 762
 763         info->ignore_status_mask = 0;
 764
 765         if (I_IGNBRK(tty)) {
 766                 info->ignore_status_mask |= UART_LSR_BI;
 767                 info->read_status_mask |= UART_LSR_BI;
 768                 /*
 769                  * If we're ignore parity and break indicators, ignore
 770                  * overruns too.  (For real raw support).
 771                  */
 772                 if (I_IGNPAR(tty)) {
 773                         info->ignore_status_mask |=
 774                                                 UART_LSR_OE |
 775                                                 UART_LSR_PE |
 776                                                 UART_LSR_FE;
 777                         info->read_status_mask |=
 778                                                 UART_LSR_OE |
 779                                                 UART_LSR_PE |
 780                                                 UART_LSR_FE;
 781                 }
 782         }
 783         if (info->board->chip_flag) {
 784                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 785                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 786                 if (I_IXON(tty)) {
 787                         mxser_enable_must_rx_software_flow_control(
 788                                         info->ioaddr);
 789                 } else {
 790                         mxser_disable_must_rx_software_flow_control(
 791                                         info->ioaddr);
 792                 }
 793                 if (I_IXOFF(tty)) {
 794                         mxser_enable_must_tx_software_flow_control(
 795                                         info->ioaddr);
 796                 } else {
 797                         mxser_disable_must_tx_software_flow_control(
 798                                         info->ioaddr);
 799                 }
 800         }
 801
 802
 803         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 804         outb(cval, info->ioaddr + UART_LCR);
 805
 806         return ret;
 807 }
 808
 809 static void mxser_check_modem_status(struct tty_struct *tty,
 810                                 struct mxser_port *port, int status)
 811 {
 812         /* update input line counters */
 813         if (status & UART_MSR_TERI)
 814                 port->icount.rng++;
 815         if (status & UART_MSR_DDSR)
 816                 port->icount.dsr++;
 817         if (status & UART_MSR_DDCD)
 818                 port->icount.dcd++;
 819         if (status & UART_MSR_DCTS)
 820                 port->icount.cts++;
 821         port->mon_data.modem_status = status;
 822         wake_up_interruptible(&port->port.delta_msr_wait);
 823
 824         if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
 825                 if (status & UART_MSR_DCD)
 826                         wake_up_interruptible(&port->port.open_wait);
 827         }
 828
 829         if (tty_port_cts_enabled(&port->port)) {
 830                 if (tty->hw_stopped) {
 831                         if (status & UART_MSR_CTS) {
 832                                 tty->hw_stopped = 0;
 833
 834                                 if ((port->type != PORT_16550A) &&
 835                                                 (!port->board->chip_flag)) {
 836                                         outb(port->IER & ~UART_IER_THRI,
 837                                                 port->ioaddr + UART_IER);
 838                                         port->IER |= UART_IER_THRI;
 839                                         outb(port->IER, port->ioaddr +
 840                                                         UART_IER);
 841                                 }
 842                                 tty_wakeup(tty);
 843                         }
 844                 } else {
 845                         if (!(status & UART_MSR_CTS)) {
 846                                 tty->hw_stopped = 1;
 847                                 if (port->type != PORT_16550A &&
 848                                                 !port->board->chip_flag) {
 849                                         port->IER &= ~UART_IER_THRI;
 850                                         outb(port->IER, port->ioaddr +
 851                                                         UART_IER);
 852                                 }
 853                         }
 854                 }
 855         }
 856 }
 857
 858 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 859 {
 860         struct mxser_port *info = container_of(port, struct mxser_port, port);
 861         unsigned long page;
 862         unsigned long flags;
 863         int ret;
 864
 865         page = __get_free_page(GFP_KERNEL);
 866         if (!page)
 867                 return -ENOMEM;
 868
 869         spin_lock_irqsave(&info->slock, flags);
 870
 871         if (!info->ioaddr || !info->type) {
 872                 set_bit(TTY_IO_ERROR, &tty->flags);
 873                 spin_unlock_irqrestore(&info->slock, flags);
 874                 ret = 0;
 875                 goto err_free_xmit;
 876         }
 877         info->port.xmit_buf = (unsigned char *) page;
 878
 879         /*
 880          * Clear the FIFO buffers and disable them
 881          * (they will be reenabled in mxser_change_speed())
 882          */
 883         if (info->board->chip_flag)
 884                 outb((UART_FCR_CLEAR_RCVR |
 885                         UART_FCR_CLEAR_XMIT |
 886                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 887         else
 888                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 889                         info->ioaddr + UART_FCR);
 890
 891         /*
 892          * At this point there's no way the LSR could still be 0xFF;
 893          * if it is, then bail out, because there's likely no UART
 894          * here.
 895          */
 896         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 897                 spin_unlock_irqrestore(&info->slock, flags);
 898                 if (capable(CAP_SYS_ADMIN)) {
 899                         set_bit(TTY_IO_ERROR, &tty->flags);
 900                         return 0;
 901                 }
 902
 903                 ret = -ENODEV;
 904                 goto err_free_xmit;
 905         }
 906
 907         /*
 908          * Clear the interrupt registers.
 909          */
 910         (void) inb(info->ioaddr + UART_LSR);
 911         (void) inb(info->ioaddr + UART_RX);
 912         (void) inb(info->ioaddr + UART_IIR);
 913         (void) inb(info->ioaddr + UART_MSR);
 914
 915         /*
 916          * Now, initialize the UART
 917          */
 918         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 919         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 920         outb(info->MCR, info->ioaddr + UART_MCR);
 921
 922         /*
 923          * Finally, enable interrupts
 924          */
 925         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 926
 927         if (info->board->chip_flag)
 928                 info->IER |= MOXA_MUST_IER_EGDAI;
 929         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 930
 931         /*
 932          * And clear the interrupt registers again for luck.
 933          */
 934         (void) inb(info->ioaddr + UART_LSR);
 935         (void) inb(info->ioaddr + UART_RX);
 936         (void) inb(info->ioaddr + UART_IIR);
 937         (void) inb(info->ioaddr + UART_MSR);
 938
 939         clear_bit(TTY_IO_ERROR, &tty->flags);
 940         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 941
 942         /*
 943          * and set the speed of the serial port
 944          */
 945         mxser_change_speed(tty, NULL);
 946         spin_unlock_irqrestore(&info->slock, flags);
 947
 948         return 0;
 949 err_free_xmit:
 950         free_page(page);
 951         info->port.xmit_buf = NULL;
 952         return ret;
 953 }
 954
 955 /*
 956  * This routine will shutdown a serial port
 957  */
 958 static void mxser_shutdown_port(struct tty_port *port)
 959 {
 960         struct mxser_port *info = container_of(port, struct mxser_port, port);
 961         unsigned long flags;
 962
 963         spin_lock_irqsave(&info->slock, flags);
 964
 965         /*
 966          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 967          * here so the queue might never be waken up
 968          */
 969         wake_up_interruptible(&info->port.delta_msr_wait);
 970
 971         /*
 972          * Free the xmit buffer, if necessary
 973          */
 974         if (info->port.xmit_buf) {
 975                 free_page((unsigned long) info->port.xmit_buf);
 976                 info->port.xmit_buf = NULL;
 977         }
 978
 979         info->IER = 0;
 980         outb(0x00, info->ioaddr + UART_IER);
 981
 982         /* clear Rx/Tx FIFO's */
 983         if (info->board->chip_flag)
 984                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 985                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 986                                 info->ioaddr + UART_FCR);
 987         else
 988                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 989                         info->ioaddr + UART_FCR);
 990
 991         /* read data port to reset things */
 992         (void) inb(info->ioaddr + UART_RX);
 993
 994
 995         if (info->board->chip_flag)
 996                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 997
 998         spin_unlock_irqrestore(&info->slock, flags);
 999 }
1000
1001 /*
1002  * This routine is called whenever a serial port is opened.  It
1003  * enables interrupts for a serial port, linking in its async structure into
1004  * the IRQ chain.   It also performs the serial-specific
1005  * initialization for the tty structure.
1006  */
1007 static int mxser_open(struct tty_struct *tty, struct file *filp)
1008 {
1009         struct mxser_port *info;
1010         int line;
1011
1012         line = tty->index;
1013         if (line == MXSER_PORTS)
1014                 return 0;
1015         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1016         if (!info->ioaddr)
1017                 return -ENODEV;
1018
1019         tty->driver_data = info;
1020         return tty_port_open(&info->port, tty, filp);
1021 }
1022
1023 static void mxser_flush_buffer(struct tty_struct *tty)
1024 {
1025         struct mxser_port *info = tty->driver_data;
1026         char fcr;
1027         unsigned long flags;
1028
1029
1030         spin_lock_irqsave(&info->slock, flags);
1031         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1032
1033         fcr = inb(info->ioaddr + UART_FCR);
1034         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1035                 info->ioaddr + UART_FCR);
1036         outb(fcr, info->ioaddr + UART_FCR);
1037
1038         spin_unlock_irqrestore(&info->slock, flags);
1039
1040         tty_wakeup(tty);
1041 }
1042
1043
1044 static void mxser_close_port(struct tty_port *port)
1045 {
1046         struct mxser_port *info = container_of(port, struct mxser_port, port);
1047         unsigned long timeout;
1048         /*
1049          * At this point we stop accepting input.  To do this, we
1050          * disable the receive line status interrupts, and tell the
1051          * interrupt driver to stop checking the data ready bit in the
1052          * line status register.
1053          */
1054         info->IER &= ~UART_IER_RLSI;
1055         if (info->board->chip_flag)
1056                 info->IER &= ~MOXA_MUST_RECV_ISR;
1057
1058         outb(info->IER, info->ioaddr + UART_IER);
1059         /*
1060          * Before we drop DTR, make sure the UART transmitter
1061          * has completely drained; this is especially
1062          * important if there is a transmit FIFO!
1063          */
1064         timeout = jiffies + HZ;
1065         while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1066                 schedule_timeout_interruptible(5);
1067                 if (time_after(jiffies, timeout))
1068                         break;
1069         }
1070 }
1071
1072 /*
1073  * This routine is called when the serial port gets closed.  First, we
1074  * wait for the last remaining data to be sent.  Then, we unlink its
1075  * async structure from the interrupt chain if necessary, and we free
1076  * that IRQ if nothing is left in the chain.
1077  */
1078 static void mxser_close(struct tty_struct *tty, struct file *filp)
1079 {
1080         struct mxser_port *info = tty->driver_data;
1081         struct tty_port *port = &info->port;
1082
1083         if (tty->index == MXSER_PORTS || info == NULL)
1084                 return;
1085         if (tty_port_close_start(port, tty, filp) == 0)
1086                 return;
1087         info->closing = 1;
1088         mutex_lock(&port->mutex);
1089         mxser_close_port(port);
1090         mxser_flush_buffer(tty);
1091         if (tty_port_initialized(port) && C_HUPCL(tty))
1092                 tty_port_lower_dtr_rts(port);
1093         mxser_shutdown_port(port);
1094         tty_port_set_initialized(port, 0);
1095         mutex_unlock(&port->mutex);
1096         info->closing = 0;
1097         /* Right now the tty_port set is done outside of the close_end helper
1098            as we don't yet have everyone using refcounts */
1099         tty_port_close_end(port, tty);
1100         tty_port_tty_set(port, NULL);
1101 }
1102
1103 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1104 {
1105         int c, total = 0;
1106         struct mxser_port *info = tty->driver_data;
1107         unsigned long flags;
1108
1109         if (!info->port.xmit_buf)
1110                 return 0;
1111
1112         while (1) {
1113                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1114                                           SERIAL_XMIT_SIZE - info->xmit_head));
1115                 if (c <= 0)
1116                         break;
1117
1118                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1119                 spin_lock_irqsave(&info->slock, flags);
1120                 info->xmit_head = (info->xmit_head + c) &
1121                                   (SERIAL_XMIT_SIZE - 1);
1122                 info->xmit_cnt += c;
1123                 spin_unlock_irqrestore(&info->slock, flags);
1124
1125                 buf += c;
1126                 count -= c;
1127                 total += c;
1128         }
1129
1130         if (info->xmit_cnt && !tty->stopped) {
1131                 if (!tty->hw_stopped ||
1132                                 (info->type == PORT_16550A) ||
1133                                 (info->board->chip_flag)) {
1134                         spin_lock_irqsave(&info->slock, flags);
1135                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1136                                         UART_IER);
1137                         info->IER |= UART_IER_THRI;
1138                         outb(info->IER, info->ioaddr + UART_IER);
1139                         spin_unlock_irqrestore(&info->slock, flags);
1140                 }
1141         }
1142         return total;
1143 }
1144
1145 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1146 {
1147         struct mxser_port *info = tty->driver_data;
1148         unsigned long flags;
1149
1150         if (!info->port.xmit_buf)
1151                 return 0;
1152
1153         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1154                 return 0;
1155
1156         spin_lock_irqsave(&info->slock, flags);
1157         info->port.xmit_buf[info->xmit_head++] = ch;
1158         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1159         info->xmit_cnt++;
1160         spin_unlock_irqrestore(&info->slock, flags);
1161         if (!tty->stopped) {
1162                 if (!tty->hw_stopped ||
1163                                 (info->type == PORT_16550A) ||
1164                                 info->board->chip_flag) {
1165                         spin_lock_irqsave(&info->slock, flags);
1166                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1167                         info->IER |= UART_IER_THRI;
1168                         outb(info->IER, info->ioaddr + UART_IER);
1169                         spin_unlock_irqrestore(&info->slock, flags);
1170                 }
1171         }
1172         return 1;
1173 }
1174
1175
1176 static void mxser_flush_chars(struct tty_struct *tty)
1177 {
1178         struct mxser_port *info = tty->driver_data;
1179         unsigned long flags;
1180
1181         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1182                         (tty->hw_stopped && info->type != PORT_16550A &&
1183                          !info->board->chip_flag))
1184                 return;
1185
1186         spin_lock_irqsave(&info->slock, flags);
1187
1188         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1189         info->IER |= UART_IER_THRI;
1190         outb(info->IER, info->ioaddr + UART_IER);
1191
1192         spin_unlock_irqrestore(&info->slock, flags);
1193 }
1194
1195 static int mxser_write_room(struct tty_struct *tty)
1196 {
1197         struct mxser_port *info = tty->driver_data;
1198         int ret;
1199
1200         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1201         return ret < 0 ? 0 : ret;
1202 }
1203
1204 static int mxser_chars_in_buffer(struct tty_struct *tty)
1205 {
1206         struct mxser_port *info = tty->driver_data;
1207         return info->xmit_cnt;
1208 }
1209
1210 /*
1211  * ------------------------------------------------------------
1212  * friends of mxser_ioctl()
1213  * ------------------------------------------------------------
1214  */
1215 static int mxser_get_serial_info(struct tty_struct *tty,
1216                 struct serial_struct __user *retinfo)
1217 {
1218         struct mxser_port *info = tty->driver_data;
1219         struct serial_struct tmp = {
1220                 .type = info->type,
1221                 .line = tty->index,
1222                 .port = info->ioaddr,
1223                 .irq = info->board->irq,
1224                 .flags = info->port.flags,
1225                 .baud_base = info->baud_base,
1226                 .close_delay = info->port.close_delay,
1227                 .closing_wait = info->port.closing_wait,
1228                 .custom_divisor = info->custom_divisor,
1229         };
1230         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1231                 return -EFAULT;
1232         return 0;
1233 }
1234
1235 static int mxser_set_serial_info(struct tty_struct *tty,
1236                 struct serial_struct __user *new_info)
1237 {
1238         struct mxser_port *info = tty->driver_data;
1239         struct tty_port *port = &info->port;
1240         struct serial_struct new_serial;
1241         speed_t baud;
1242         unsigned long sl_flags;
1243         unsigned int flags;
1244         int retval = 0;
1245
1246         if (!new_info || !info->ioaddr)
1247                 return -ENODEV;
1248         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1249                 return -EFAULT;
1250
1251         if (new_serial.irq != info->board->irq ||
1252                         new_serial.port != info->ioaddr)
1253                 return -EINVAL;
1254
1255         flags = port->flags & ASYNC_SPD_MASK;
1256
1257         if (!capable(CAP_SYS_ADMIN)) {
1258                 if ((new_serial.baud_base != info->baud_base) ||
1259                                 (new_serial.close_delay != info->port.close_delay) ||
1260                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1261                         return -EPERM;
1262                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1263                                 (new_serial.flags & ASYNC_USR_MASK));
1264         } else {
1265                 /*
1266                  * OK, past this point, all the error checking has been done.
1267                  * At this point, we start making changes.....
1268                  */
1269                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1270                                 (new_serial.flags & ASYNC_FLAGS));
1271                 port->close_delay = new_serial.close_delay * HZ / 100;
1272                 port->closing_wait = new_serial.closing_wait * HZ / 100;
1273                 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1274                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1275                                 (new_serial.baud_base != info->baud_base ||
1276                                 new_serial.custom_divisor !=
1277                                 info->custom_divisor)) {
1278                         if (new_serial.custom_divisor == 0)
1279                                 return -EINVAL;
1280                         baud = new_serial.baud_base / new_serial.custom_divisor;
1281                         tty_encode_baud_rate(tty, baud, baud);
1282                 }
1283         }
1284
1285         info->type = new_serial.type;
1286
1287         process_txrx_fifo(info);
1288
1289         if (tty_port_initialized(port)) {
1290                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1291                         spin_lock_irqsave(&info->slock, sl_flags);
1292                         mxser_change_speed(tty, NULL);
1293                         spin_unlock_irqrestore(&info->slock, sl_flags);
1294                 }
1295         } else {
1296                 retval = mxser_activate(port, tty);
1297                 if (retval == 0)
1298                         tty_port_set_initialized(port, 1);
1299         }
1300         return retval;
1301 }
1302
1303 /*
1304  * mxser_get_lsr_info - get line status register info
1305  *
1306  * Purpose: Let user call ioctl() to get info when the UART physically
1307  *          is emptied.  On bus types like RS485, the transmitter must
1308  *          release the bus after transmitting. This must be done when
1309  *          the transmit shift register is empty, not be done when the
1310  *          transmit holding register is empty.  This functionality
1311  *          allows an RS485 driver to be written in user space.
1312  */
1313 static int mxser_get_lsr_info(struct mxser_port *info,
1314                 unsigned int __user *value)
1315 {
1316         unsigned char status;
1317         unsigned int result;
1318         unsigned long flags;
1319
1320         spin_lock_irqsave(&info->slock, flags);
1321         status = inb(info->ioaddr + UART_LSR);
1322         spin_unlock_irqrestore(&info->slock, flags);
1323         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1324         return put_user(result, value);
1325 }
1326
1327 static int mxser_tiocmget(struct tty_struct *tty)
1328 {
1329         struct mxser_port *info = tty->driver_data;
1330         unsigned char control, status;
1331         unsigned long flags;
1332
1333
1334         if (tty->index == MXSER_PORTS)
1335                 return -ENOIOCTLCMD;
1336         if (tty_io_error(tty))
1337                 return -EIO;
1338
1339         control = info->MCR;
1340
1341         spin_lock_irqsave(&info->slock, flags);
1342         status = inb(info->ioaddr + UART_MSR);
1343         if (status & UART_MSR_ANY_DELTA)
1344                 mxser_check_modem_status(tty, info, status);
1345         spin_unlock_irqrestore(&info->slock, flags);
1346         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1347                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1348                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1349                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1350                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1351                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1352 }
1353
1354 static int mxser_tiocmset(struct tty_struct *tty,
1355                 unsigned int set, unsigned int clear)
1356 {
1357         struct mxser_port *info = tty->driver_data;
1358         unsigned long flags;
1359
1360
1361         if (tty->index == MXSER_PORTS)
1362                 return -ENOIOCTLCMD;
1363         if (tty_io_error(tty))
1364                 return -EIO;
1365
1366         spin_lock_irqsave(&info->slock, flags);
1367
1368         if (set & TIOCM_RTS)
1369                 info->MCR |= UART_MCR_RTS;
1370         if (set & TIOCM_DTR)
1371                 info->MCR |= UART_MCR_DTR;
1372
1373         if (clear & TIOCM_RTS)
1374                 info->MCR &= ~UART_MCR_RTS;
1375         if (clear & TIOCM_DTR)
1376                 info->MCR &= ~UART_MCR_DTR;
1377
1378         outb(info->MCR, info->ioaddr + UART_MCR);
1379         spin_unlock_irqrestore(&info->slock, flags);
1380         return 0;
1381 }
1382
1383 static int __init mxser_program_mode(int port)
1384 {
1385         int id, i, j, n;
1386
1387         outb(0, port);
1388         outb(0, port);
1389         outb(0, port);
1390         (void)inb(port);
1391         (void)inb(port);
1392         outb(0, port);
1393         (void)inb(port);
1394
1395         id = inb(port + 1) & 0x1F;
1396         if ((id != C168_ASIC_ID) &&
1397                         (id != C104_ASIC_ID) &&
1398                         (id != C102_ASIC_ID) &&
1399                         (id != CI132_ASIC_ID) &&
1400                         (id != CI134_ASIC_ID) &&
1401                         (id != CI104J_ASIC_ID))
1402                 return -1;
1403         for (i = 0, j = 0; i < 4; i++) {
1404                 n = inb(port + 2);
1405                 if (n == 'M') {
1406                         j = 1;
1407                 } else if ((j == 1) && (n == 1)) {
1408                         j = 2;
1409                         break;
1410                 } else
1411                         j = 0;
1412         }
1413         if (j != 2)
1414                 id = -2;
1415         return id;
1416 }
1417
1418 static void __init mxser_normal_mode(int port)
1419 {
1420         int i, n;
1421
1422         outb(0xA5, port + 1);
1423         outb(0x80, port + 3);
1424         outb(12, port + 0);     /* 9600 bps */
1425         outb(0, port + 1);
1426         outb(0x03, port + 3);   /* 8 data bits */
1427         outb(0x13, port + 4);   /* loop back mode */
1428         for (i = 0; i < 16; i++) {
1429                 n = inb(port + 5);
1430                 if ((n & 0x61) == 0x60)
1431                         break;
1432                 if ((n & 1) == 1)
1433                         (void)inb(port);
1434         }
1435         outb(0x00, port + 4);
1436 }
1437
1438 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1439 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1440 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1441 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1442 #define EN_CCMD         0x000   /* Chip's command register     */
1443 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1444 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1445 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1446 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1447 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1448 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1449 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1450 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1451 static int __init mxser_read_register(int port, unsigned short *regs)
1452 {
1453         int i, k, value, id;
1454         unsigned int j;
1455
1456         id = mxser_program_mode(port);
1457         if (id < 0)
1458                 return id;
1459         for (i = 0; i < 14; i++) {
1460                 k = (i & 0x3F) | 0x180;
1461                 for (j = 0x100; j > 0; j >>= 1) {
1462                         outb(CHIP_CS, port);
1463                         if (k & j) {
1464                                 outb(CHIP_CS | CHIP_DO, port);
1465                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1466                         } else {
1467                                 outb(CHIP_CS, port);
1468                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1469                         }
1470                 }
1471                 (void)inb(port);
1472                 value = 0;
1473                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1474                         outb(CHIP_CS, port);
1475                         outb(CHIP_CS | CHIP_SK, port);
1476                         if (inb(port) & CHIP_DI)
1477                                 value |= j;
1478                 }
1479                 regs[i] = value;
1480                 outb(0, port);
1481         }
1482         mxser_normal_mode(port);
1483         return id;
1484 }
1485
1486 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1487 {
1488         struct mxser_port *ip;
1489         struct tty_port *port;
1490         struct tty_struct *tty;
1491         int result, status;
1492         unsigned int i, j;
1493         int ret = 0;
1494
1495         switch (cmd) {
1496         case MOXA_GET_MAJOR:
1497                 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1498                                         "%x (GET_MAJOR), fix your userspace\n",
1499                                         current->comm, cmd);
1500                 return put_user(ttymajor, (int __user *)argp);
1501
1502         case MOXA_CHKPORTENABLE:
1503                 result = 0;
1504                 for (i = 0; i < MXSER_BOARDS; i++)
1505                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1506                                 if (mxser_boards[i].ports[j].ioaddr)
1507                                         result |= (1 << i);
1508                 return put_user(result, (unsigned long __user *)argp);
1509         case MOXA_GETDATACOUNT:
1510                 /* The receive side is locked by port->slock but it isn't
1511                    clear that an exact snapshot is worth copying here */
1512                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1513                         ret = -EFAULT;
1514                 return ret;
1515         case MOXA_GETMSTATUS: {
1516                 struct mxser_mstatus ms, __user *msu = argp;
1517                 for (i = 0; i < MXSER_BOARDS; i++)
1518                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1519                                 ip = &mxser_boards[i].ports[j];
1520                                 port = &ip->port;
1521                                 memset(&ms, 0, sizeof(ms));
1522
1523                                 mutex_lock(&port->mutex);
1524                                 if (!ip->ioaddr)
1525                                         goto copy;
1526
1527                                 tty = tty_port_tty_get(port);
1528
1529                                 if (!tty)
1530                                         ms.cflag = ip->normal_termios.c_cflag;
1531                                 else
1532                                         ms.cflag = tty->termios.c_cflag;
1533                                 tty_kref_put(tty);
1534                                 spin_lock_irq(&ip->slock);
1535                                 status = inb(ip->ioaddr + UART_MSR);
1536                                 spin_unlock_irq(&ip->slock);
1537                                 if (status & UART_MSR_DCD)
1538                                         ms.dcd = 1;
1539                                 if (status & UART_MSR_DSR)
1540                                         ms.dsr = 1;
1541                                 if (status & UART_MSR_CTS)
1542                                         ms.cts = 1;
1543                         copy:
1544                                 mutex_unlock(&port->mutex);
1545                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1546                                         return -EFAULT;
1547                                 msu++;
1548                         }
1549                 return 0;
1550         }
1551         case MOXA_ASPP_MON_EXT: {
1552                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1553                 unsigned int cflag, iflag, p;
1554                 u8 opmode;
1555
1556                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1557                 if (!me)
1558                         return -ENOMEM;
1559
1560                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1561                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1562                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1563                                         i = MXSER_BOARDS;
1564                                         break;
1565                                 }
1566                                 ip = &mxser_boards[i].ports[j];
1567                                 port = &ip->port;
1568
1569                                 mutex_lock(&port->mutex);
1570                                 if (!ip->ioaddr) {
1571                                         mutex_unlock(&port->mutex);
1572                                         continue;
1573                                 }
1574
1575                                 spin_lock_irq(&ip->slock);
1576                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1577
1578                                 if (status & UART_MSR_TERI)
1579                                         ip->icount.rng++;
1580                                 if (status & UART_MSR_DDSR)
1581                                         ip->icount.dsr++;
1582                                 if (status & UART_MSR_DDCD)
1583                                         ip->icount.dcd++;
1584                                 if (status & UART_MSR_DCTS)
1585                                         ip->icount.cts++;
1586
1587                                 ip->mon_data.modem_status = status;
1588                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1589                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1590                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1591                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1592                                 me->modem_status[p] =
1593                                         ip->mon_data.modem_status;
1594                                 spin_unlock_irq(&ip->slock);
1595
1596                                 tty = tty_port_tty_get(&ip->port);
1597
1598                                 if (!tty) {
1599                                         cflag = ip->normal_termios.c_cflag;
1600                                         iflag = ip->normal_termios.c_iflag;
1601                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1602                                 } else {
1603                                         cflag = tty->termios.c_cflag;
1604                                         iflag = tty->termios.c_iflag;
1605                                         me->baudrate[p] = tty_get_baud_rate(tty);
1606                                 }
1607                                 tty_kref_put(tty);
1608
1609                                 me->databits[p] = cflag & CSIZE;
1610                                 me->stopbits[p] = cflag & CSTOPB;
1611                                 me->parity[p] = cflag & (PARENB | PARODD |
1612                                                 CMSPAR);
1613
1614                                 if (cflag & CRTSCTS)
1615                                         me->flowctrl[p] |= 0x03;
1616
1617                                 if (iflag & (IXON | IXOFF))
1618                                         me->flowctrl[p] |= 0x0C;
1619
1620                                 if (ip->type == PORT_16550A)
1621                                         me->fifo[p] = 1;
1622
1623                                 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1624                                         opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1625                                         opmode &= OP_MODE_MASK;
1626                                 } else {
1627                                         opmode = RS232_MODE;
1628                                 }
1629                                 me->iftype[p] = opmode;
1630                                 mutex_unlock(&port->mutex);
1631                         }
1632                 }
1633                 if (copy_to_user(argp, me, sizeof(*me)))
1634                         ret = -EFAULT;
1635                 kfree(me);
1636                 return ret;
1637         }
1638         default:
1639                 return -ENOIOCTLCMD;
1640         }
1641         return 0;
1642 }
1643
1644 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1645                 struct async_icount *cprev)
1646 {
1647         struct async_icount cnow;
1648         unsigned long flags;
1649         int ret;
1650
1651         spin_lock_irqsave(&info->slock, flags);
1652         cnow = info->icount;    /* atomic copy */
1653         spin_unlock_irqrestore(&info->slock, flags);
1654
1655         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1656                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1657                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1658                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1659
1660         *cprev = cnow;
1661
1662         return ret;
1663 }
1664
1665 static int mxser_ioctl(struct tty_struct *tty,
1666                 unsigned int cmd, unsigned long arg)
1667 {
1668         struct mxser_port *info = tty->driver_data;
1669         struct tty_port *port = &info->port;
1670         struct async_icount cnow;
1671         unsigned long flags;
1672         void __user *argp = (void __user *)arg;
1673         int retval;
1674
1675         if (tty->index == MXSER_PORTS)
1676                 return mxser_ioctl_special(cmd, argp);
1677
1678         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1679                 int p;
1680                 unsigned long opmode;
1681                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1682                 int shiftbit;
1683                 unsigned char val, mask;
1684
1685                 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1686                         return -EFAULT;
1687
1688                 p = tty->index % 4;
1689                 if (cmd == MOXA_SET_OP_MODE) {
1690                         if (get_user(opmode, (int __user *) argp))
1691                                 return -EFAULT;
1692                         if (opmode != RS232_MODE &&
1693                                         opmode != RS485_2WIRE_MODE &&
1694                                         opmode != RS422_MODE &&
1695                                         opmode != RS485_4WIRE_MODE)
1696                                 return -EFAULT;
1697                         mask = ModeMask[p];
1698                         shiftbit = p * 2;
1699                         spin_lock_irq(&info->slock);
1700                         val = inb(info->opmode_ioaddr);
1701                         val &= mask;
1702                         val |= (opmode << shiftbit);
1703                         outb(val, info->opmode_ioaddr);
1704                         spin_unlock_irq(&info->slock);
1705                 } else {
1706                         shiftbit = p * 2;
1707                         spin_lock_irq(&info->slock);
1708                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1709                         spin_unlock_irq(&info->slock);
1710                         opmode &= OP_MODE_MASK;
1711                         if (put_user(opmode, (int __user *)argp))
1712                                 return -EFAULT;
1713                 }
1714                 return 0;
1715         }
1716
1717         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && tty_io_error(tty))
1718                 return -EIO;
1719
1720         switch (cmd) {
1721         case TIOCGSERIAL:
1722                 mutex_lock(&port->mutex);
1723                 retval = mxser_get_serial_info(tty, argp);
1724                 mutex_unlock(&port->mutex);
1725                 return retval;
1726         case TIOCSSERIAL:
1727                 mutex_lock(&port->mutex);
1728                 retval = mxser_set_serial_info(tty, argp);
1729                 mutex_unlock(&port->mutex);
1730                 return retval;
1731         case TIOCSERGETLSR:     /* Get line status register */
1732                 return  mxser_get_lsr_info(info, argp);
1733                 /*
1734                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1735                  * - mask passed in arg for lines of interest
1736                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1737                  * Caller should use TIOCGICOUNT to see which one it was
1738                  */
1739         case TIOCMIWAIT:
1740                 spin_lock_irqsave(&info->slock, flags);
1741                 cnow = info->icount;    /* note the counters on entry */
1742                 spin_unlock_irqrestore(&info->slock, flags);
1743
1744                 return wait_event_interruptible(info->port.delta_msr_wait,
1745                                 mxser_cflags_changed(info, arg, &cnow));
1746         case MOXA_HighSpeedOn:
1747                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1748         case MOXA_SDS_RSTICOUNTER:
1749                 spin_lock_irq(&info->slock);
1750                 info->mon_data.rxcnt = 0;
1751                 info->mon_data.txcnt = 0;
1752                 spin_unlock_irq(&info->slock);
1753                 return 0;
1754
1755         case MOXA_ASPP_OQUEUE:{
1756                 int len, lsr;
1757
1758                 len = mxser_chars_in_buffer(tty);
1759                 spin_lock_irq(&info->slock);
1760                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1761                 spin_unlock_irq(&info->slock);
1762                 len += (lsr ? 0 : 1);
1763
1764                 return put_user(len, (int __user *)argp);
1765         }
1766         case MOXA_ASPP_MON: {
1767                 int mcr, status;
1768
1769                 spin_lock_irq(&info->slock);
1770                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1771                 mxser_check_modem_status(tty, info, status);
1772
1773                 mcr = inb(info->ioaddr + UART_MCR);
1774                 spin_unlock_irq(&info->slock);
1775
1776                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1777                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1778                 else
1779                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1780
1781                 if (mcr & MOXA_MUST_MCR_TX_XON)
1782                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1783                 else
1784                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1785
1786                 if (tty->hw_stopped)
1787                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1788                 else
1789                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1790
1791                 if (copy_to_user(argp, &info->mon_data,
1792                                 sizeof(struct mxser_mon)))
1793                         return -EFAULT;
1794
1795                 return 0;
1796         }
1797         case MOXA_ASPP_LSTATUS: {
1798                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1799                         return -EFAULT;
1800
1801                 info->err_shadow = 0;
1802                 return 0;
1803         }
1804         case MOXA_SET_BAUD_METHOD: {
1805                 int method;
1806
1807                 if (get_user(method, (int __user *)argp))
1808                         return -EFAULT;
1809                 mxser_set_baud_method[tty->index] = method;
1810                 return put_user(method, (int __user *)argp);
1811         }
1812         default:
1813                 return -ENOIOCTLCMD;
1814         }
1815         return 0;
1816 }
1817
1818         /*
1819          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1820          * Return: write counters to the user passed counter struct
1821          * NB: both 1->0 and 0->1 transitions are counted except for
1822          *     RI where only 0->1 is counted.
1823          */
1824
1825 static int mxser_get_icount(struct tty_struct *tty,
1826                 struct serial_icounter_struct *icount)
1827
1828 {
1829         struct mxser_port *info = tty->driver_data;
1830         struct async_icount cnow;
1831         unsigned long flags;
1832
1833         spin_lock_irqsave(&info->slock, flags);
1834         cnow = info->icount;
1835         spin_unlock_irqrestore(&info->slock, flags);
1836
1837         icount->frame = cnow.frame;
1838         icount->brk = cnow.brk;
1839         icount->overrun = cnow.overrun;
1840         icount->buf_overrun = cnow.buf_overrun;
1841         icount->parity = cnow.parity;
1842         icount->rx = cnow.rx;
1843         icount->tx = cnow.tx;
1844         icount->cts = cnow.cts;
1845         icount->dsr = cnow.dsr;
1846         icount->rng = cnow.rng;
1847         icount->dcd = cnow.dcd;
1848         return 0;
1849 }
1850
1851 static void mxser_stoprx(struct tty_struct *tty)
1852 {
1853         struct mxser_port *info = tty->driver_data;
1854
1855         info->ldisc_stop_rx = 1;
1856         if (I_IXOFF(tty)) {
1857                 if (info->board->chip_flag) {
1858                         info->IER &= ~MOXA_MUST_RECV_ISR;
1859                         outb(info->IER, info->ioaddr + UART_IER);
1860                 } else {
1861                         info->x_char = STOP_CHAR(tty);
1862                         outb(0, info->ioaddr + UART_IER);
1863                         info->IER |= UART_IER_THRI;
1864                         outb(info->IER, info->ioaddr + UART_IER);
1865                 }
1866         }
1867
1868         if (C_CRTSCTS(tty)) {
1869                 info->MCR &= ~UART_MCR_RTS;
1870                 outb(info->MCR, info->ioaddr + UART_MCR);
1871         }
1872 }
1873
1874 /*
1875  * This routine is called by the upper-layer tty layer to signal that
1876  * incoming characters should be throttled.
1877  */
1878 static void mxser_throttle(struct tty_struct *tty)
1879 {
1880         mxser_stoprx(tty);
1881 }
1882
1883 static void mxser_unthrottle(struct tty_struct *tty)
1884 {
1885         struct mxser_port *info = tty->driver_data;
1886
1887         /* startrx */
1888         info->ldisc_stop_rx = 0;
1889         if (I_IXOFF(tty)) {
1890                 if (info->x_char)
1891                         info->x_char = 0;
1892                 else {
1893                         if (info->board->chip_flag) {
1894                                 info->IER |= MOXA_MUST_RECV_ISR;
1895                                 outb(info->IER, info->ioaddr + UART_IER);
1896                         } else {
1897                                 info->x_char = START_CHAR(tty);
1898                                 outb(0, info->ioaddr + UART_IER);
1899                                 info->IER |= UART_IER_THRI;
1900                                 outb(info->IER, info->ioaddr + UART_IER);
1901                         }
1902                 }
1903         }
1904
1905         if (C_CRTSCTS(tty)) {
1906                 info->MCR |= UART_MCR_RTS;
1907                 outb(info->MCR, info->ioaddr + UART_MCR);
1908         }
1909 }
1910
1911 /*
1912  * mxser_stop() and mxser_start()
1913  *
1914  * This routines are called before setting or resetting tty->stopped.
1915  * They enable or disable transmitter interrupts, as necessary.
1916  */
1917 static void mxser_stop(struct tty_struct *tty)
1918 {
1919         struct mxser_port *info = tty->driver_data;
1920         unsigned long flags;
1921
1922         spin_lock_irqsave(&info->slock, flags);
1923         if (info->IER & UART_IER_THRI) {
1924                 info->IER &= ~UART_IER_THRI;
1925                 outb(info->IER, info->ioaddr + UART_IER);
1926         }
1927         spin_unlock_irqrestore(&info->slock, flags);
1928 }
1929
1930 static void mxser_start(struct tty_struct *tty)
1931 {
1932         struct mxser_port *info = tty->driver_data;
1933         unsigned long flags;
1934
1935         spin_lock_irqsave(&info->slock, flags);
1936         if (info->xmit_cnt && info->port.xmit_buf) {
1937                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1938                 info->IER |= UART_IER_THRI;
1939                 outb(info->IER, info->ioaddr + UART_IER);
1940         }
1941         spin_unlock_irqrestore(&info->slock, flags);
1942 }
1943
1944 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1945 {
1946         struct mxser_port *info = tty->driver_data;
1947         unsigned long flags;
1948
1949         spin_lock_irqsave(&info->slock, flags);
1950         mxser_change_speed(tty, old_termios);
1951         spin_unlock_irqrestore(&info->slock, flags);
1952
1953         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1954                 tty->hw_stopped = 0;
1955                 mxser_start(tty);
1956         }
1957
1958         /* Handle sw stopped */
1959         if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1960                 tty->stopped = 0;
1961
1962                 if (info->board->chip_flag) {
1963                         spin_lock_irqsave(&info->slock, flags);
1964                         mxser_disable_must_rx_software_flow_control(
1965                                         info->ioaddr);
1966                         spin_unlock_irqrestore(&info->slock, flags);
1967                 }
1968
1969                 mxser_start(tty);
1970         }
1971 }
1972
1973 /*
1974  * mxser_wait_until_sent() --- wait until the transmitter is empty
1975  */
1976 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1977 {
1978         struct mxser_port *info = tty->driver_data;
1979         unsigned long orig_jiffies, char_time;
1980         unsigned long flags;
1981         int lsr;
1982
1983         if (info->type == PORT_UNKNOWN)
1984                 return;
1985
1986         if (info->xmit_fifo_size == 0)
1987                 return;         /* Just in case.... */
1988
1989         orig_jiffies = jiffies;
1990         /*
1991          * Set the check interval to be 1/5 of the estimated time to
1992          * send a single character, and make it at least 1.  The check
1993          * interval should also be less than the timeout.
1994          *
1995          * Note: we have to use pretty tight timings here to satisfy
1996          * the NIST-PCTS.
1997          */
1998         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1999         char_time = char_time / 5;
2000         if (char_time == 0)
2001                 char_time = 1;
2002         if (timeout && timeout < char_time)
2003                 char_time = timeout;
2004         /*
2005          * If the transmitter hasn't cleared in twice the approximate
2006          * amount of time to send the entire FIFO, it probably won't
2007          * ever clear.  This assumes the UART isn't doing flow
2008          * control, which is currently the case.  Hence, if it ever
2009          * takes longer than info->timeout, this is probably due to a
2010          * UART bug of some kind.  So, we clamp the timeout parameter at
2011          * 2*info->timeout.
2012          */
2013         if (!timeout || timeout > 2 * info->timeout)
2014                 timeout = 2 * info->timeout;
2015
2016         spin_lock_irqsave(&info->slock, flags);
2017         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2018                 spin_unlock_irqrestore(&info->slock, flags);
2019                 schedule_timeout_interruptible(char_time);
2020                 spin_lock_irqsave(&info->slock, flags);
2021                 if (signal_pending(current))
2022                         break;
2023                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2024                         break;
2025         }
2026         spin_unlock_irqrestore(&info->slock, flags);
2027         set_current_state(TASK_RUNNING);
2028 }
2029
2030 /*
2031  * This routine is called by tty_hangup() when a hangup is signaled.
2032  */
2033 static void mxser_hangup(struct tty_struct *tty)
2034 {
2035         struct mxser_port *info = tty->driver_data;
2036
2037         mxser_flush_buffer(tty);
2038         tty_port_hangup(&info->port);
2039 }
2040
2041 /*
2042  * mxser_rs_break() --- routine which turns the break handling on or off
2043  */
2044 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2045 {
2046         struct mxser_port *info = tty->driver_data;
2047         unsigned long flags;
2048
2049         spin_lock_irqsave(&info->slock, flags);
2050         if (break_state == -1)
2051                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2052                         info->ioaddr + UART_LCR);
2053         else
2054                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2055                         info->ioaddr + UART_LCR);
2056         spin_unlock_irqrestore(&info->slock, flags);
2057         return 0;
2058 }
2059
2060 static void mxser_receive_chars(struct tty_struct *tty,
2061                                 struct mxser_port *port, int *status)
2062 {
2063         unsigned char ch, gdl;
2064         int ignored = 0;
2065         int cnt = 0;
2066         int recv_room;
2067         int max = 256;
2068
2069         recv_room = tty->receive_room;
2070         if (recv_room == 0 && !port->ldisc_stop_rx)
2071                 mxser_stoprx(tty);
2072         if (port->board->chip_flag != MOXA_OTHER_UART) {
2073
2074                 if (*status & UART_LSR_SPECIAL)
2075                         goto intr_old;
2076                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2077                                 (*status & MOXA_MUST_LSR_RERR))
2078                         goto intr_old;
2079                 if (*status & MOXA_MUST_LSR_RERR)
2080                         goto intr_old;
2081
2082                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2083
2084                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2085                         gdl &= MOXA_MUST_GDL_MASK;
2086                 if (gdl >= recv_room) {
2087                         if (!port->ldisc_stop_rx)
2088                                 mxser_stoprx(tty);
2089                 }
2090                 while (gdl--) {
2091                         ch = inb(port->ioaddr + UART_RX);
2092                         tty_insert_flip_char(&port->port, ch, 0);
2093                         cnt++;
2094                 }
2095                 goto end_intr;
2096         }
2097 intr_old:
2098
2099         do {
2100                 if (max-- < 0)
2101                         break;
2102
2103                 ch = inb(port->ioaddr + UART_RX);
2104                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2105                         outb(0x23, port->ioaddr + UART_FCR);
2106                 *status &= port->read_status_mask;
2107                 if (*status & port->ignore_status_mask) {
2108                         if (++ignored > 100)
2109                                 break;
2110                 } else {
2111                         char flag = 0;
2112                         if (*status & UART_LSR_SPECIAL) {
2113                                 if (*status & UART_LSR_BI) {
2114                                         flag = TTY_BREAK;
2115                                         port->icount.brk++;
2116
2117                                         if (port->port.flags & ASYNC_SAK)
2118                                                 do_SAK(tty);
2119                                 } else if (*status & UART_LSR_PE) {
2120                                         flag = TTY_PARITY;
2121                                         port->icount.parity++;
2122                                 } else if (*status & UART_LSR_FE) {
2123                                         flag = TTY_FRAME;
2124                                         port->icount.frame++;
2125                                 } else if (*status & UART_LSR_OE) {
2126                                         flag = TTY_OVERRUN;
2127                                         port->icount.overrun++;
2128                                 } else
2129                                         flag = TTY_BREAK;
2130                         }
2131                         tty_insert_flip_char(&port->port, ch, flag);
2132                         cnt++;
2133                         if (cnt >= recv_room) {
2134                                 if (!port->ldisc_stop_rx)
2135                                         mxser_stoprx(tty);
2136                                 break;
2137                         }
2138
2139                 }
2140
2141                 if (port->board->chip_flag)
2142                         break;
2143
2144                 *status = inb(port->ioaddr + UART_LSR);
2145         } while (*status & UART_LSR_DR);
2146
2147 end_intr:
2148         mxvar_log.rxcnt[tty->index] += cnt;
2149         port->mon_data.rxcnt += cnt;
2150         port->mon_data.up_rxcnt += cnt;
2151
2152         /*
2153          * We are called from an interrupt context with &port->slock
2154          * being held. Drop it temporarily in order to prevent
2155          * recursive locking.
2156          */
2157         spin_unlock(&port->slock);
2158         tty_flip_buffer_push(&port->port);
2159         spin_lock(&port->slock);
2160 }
2161
2162 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2163 {
2164         int count, cnt;
2165
2166         if (port->x_char) {
2167                 outb(port->x_char, port->ioaddr + UART_TX);
2168                 port->x_char = 0;
2169                 mxvar_log.txcnt[tty->index]++;
2170                 port->mon_data.txcnt++;
2171                 port->mon_data.up_txcnt++;
2172                 port->icount.tx++;
2173                 return;
2174         }
2175
2176         if (port->port.xmit_buf == NULL)
2177                 return;
2178
2179         if (port->xmit_cnt <= 0 || tty->stopped ||
2180                         (tty->hw_stopped &&
2181                         (port->type != PORT_16550A) &&
2182                         (!port->board->chip_flag))) {
2183                 port->IER &= ~UART_IER_THRI;
2184                 outb(port->IER, port->ioaddr + UART_IER);
2185                 return;
2186         }
2187
2188         cnt = port->xmit_cnt;
2189         count = port->xmit_fifo_size;
2190         do {
2191                 outb(port->port.xmit_buf[port->xmit_tail++],
2192                         port->ioaddr + UART_TX);
2193                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2194                 if (--port->xmit_cnt <= 0)
2195                         break;
2196         } while (--count > 0);
2197         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2198
2199         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2200         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2201         port->icount.tx += (cnt - port->xmit_cnt);
2202
2203         if (port->xmit_cnt < WAKEUP_CHARS)
2204                 tty_wakeup(tty);
2205
2206         if (port->xmit_cnt <= 0) {
2207                 port->IER &= ~UART_IER_THRI;
2208                 outb(port->IER, port->ioaddr + UART_IER);
2209         }
2210 }
2211
2212 /*
2213  * This is the serial driver's generic interrupt routine
2214  */
2215 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2216 {
2217         int status, iir, i;
2218         struct mxser_board *brd = NULL;
2219         struct mxser_port *port;
2220         int max, irqbits, bits, msr;
2221         unsigned int int_cnt, pass_counter = 0;
2222         int handled = IRQ_NONE;
2223         struct tty_struct *tty;
2224
2225         for (i = 0; i < MXSER_BOARDS; i++)
2226                 if (dev_id == &mxser_boards[i]) {
2227                         brd = dev_id;
2228                         break;
2229                 }
2230
2231         if (i == MXSER_BOARDS)
2232                 goto irq_stop;
2233         if (brd == NULL)
2234                 goto irq_stop;
2235         max = brd->info->nports;
2236         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2237                 irqbits = inb(brd->vector) & brd->vector_mask;
2238                 if (irqbits == brd->vector_mask)
2239                         break;
2240
2241                 handled = IRQ_HANDLED;
2242                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2243                         if (irqbits == brd->vector_mask)
2244                                 break;
2245                         if (bits & irqbits)
2246                                 continue;
2247                         port = &brd->ports[i];
2248
2249                         int_cnt = 0;
2250                         spin_lock(&port->slock);
2251                         do {
2252                                 iir = inb(port->ioaddr + UART_IIR);
2253                                 if (iir & UART_IIR_NO_INT)
2254                                         break;
2255                                 iir &= MOXA_MUST_IIR_MASK;
2256                                 tty = tty_port_tty_get(&port->port);
2257                                 if (!tty || port->closing ||
2258                                     !tty_port_initialized(&port->port)) {
2259                                         status = inb(port->ioaddr + UART_LSR);
2260                                         outb(0x27, port->ioaddr + UART_FCR);
2261                                         inb(port->ioaddr + UART_MSR);
2262                                         tty_kref_put(tty);
2263                                         break;
2264                                 }
2265
2266                                 status = inb(port->ioaddr + UART_LSR);
2267
2268                                 if (status & UART_LSR_PE)
2269                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2270                                 if (status & UART_LSR_FE)
2271                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2272                                 if (status & UART_LSR_OE)
2273                                         port->err_shadow |=
2274                                                 NPPI_NOTIFY_HW_OVERRUN;
2275                                 if (status & UART_LSR_BI)
2276                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2277
2278                                 if (port->board->chip_flag) {
2279                                         if (iir == MOXA_MUST_IIR_GDA ||
2280                                             iir == MOXA_MUST_IIR_RDA ||
2281                                             iir == MOXA_MUST_IIR_RTO ||
2282                                             iir == MOXA_MUST_IIR_LSR)
2283                                                 mxser_receive_chars(tty, port,
2284                                                                 &status);
2285
2286                                 } else {
2287                                         status &= port->read_status_mask;
2288                                         if (status & UART_LSR_DR)
2289                                                 mxser_receive_chars(tty, port,
2290                                                                 &status);
2291                                 }
2292                                 msr = inb(port->ioaddr + UART_MSR);
2293                                 if (msr & UART_MSR_ANY_DELTA)
2294                                         mxser_check_modem_status(tty, port, msr);
2295
2296                                 if (port->board->chip_flag) {
2297                                         if (iir == 0x02 && (status &
2298                                                                 UART_LSR_THRE))
2299                                                 mxser_transmit_chars(tty, port);
2300                                 } else {
2301                                         if (status & UART_LSR_THRE)
2302                                                 mxser_transmit_chars(tty, port);
2303                                 }
2304                                 tty_kref_put(tty);
2305                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2306                         spin_unlock(&port->slock);
2307                 }
2308         }
2309
2310 irq_stop:
2311         return handled;
2312 }
2313
2314 static const struct tty_operations mxser_ops = {
2315         .open = mxser_open,
2316         .close = mxser_close,
2317         .write = mxser_write,
2318         .put_char = mxser_put_char,
2319         .flush_chars = mxser_flush_chars,
2320         .write_room = mxser_write_room,
2321         .chars_in_buffer = mxser_chars_in_buffer,
2322         .flush_buffer = mxser_flush_buffer,
2323         .ioctl = mxser_ioctl,
2324         .throttle = mxser_throttle,
2325         .unthrottle = mxser_unthrottle,
2326         .set_termios = mxser_set_termios,
2327         .stop = mxser_stop,
2328         .start = mxser_start,
2329         .hangup = mxser_hangup,
2330         .break_ctl = mxser_rs_break,
2331         .wait_until_sent = mxser_wait_until_sent,
2332         .tiocmget = mxser_tiocmget,
2333         .tiocmset = mxser_tiocmset,
2334         .get_icount = mxser_get_icount,
2335 };
2336
2337 static const struct tty_port_operations mxser_port_ops = {
2338         .carrier_raised = mxser_carrier_raised,
2339         .dtr_rts = mxser_dtr_rts,
2340         .activate = mxser_activate,
2341         .shutdown = mxser_shutdown_port,
2342 };
2343
2344 /*
2345  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2346  */
2347
2348 static bool allow_overlapping_vector;
2349 module_param(allow_overlapping_vector, bool, S_IRUGO);
2350 MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2351
2352 static bool mxser_overlapping_vector(struct mxser_board *brd)
2353 {
2354         return allow_overlapping_vector &&
2355                 brd->vector >= brd->ports[0].ioaddr &&
2356                 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2357 }
2358
2359 static int mxser_request_vector(struct mxser_board *brd)
2360 {
2361         if (mxser_overlapping_vector(brd))
2362                 return 0;
2363         return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2364 }
2365
2366 static void mxser_release_vector(struct mxser_board *brd)
2367 {
2368         if (mxser_overlapping_vector(brd))
2369                 return;
2370         release_region(brd->vector, 1);
2371 }
2372
2373 static void mxser_release_ISA_res(struct mxser_board *brd)
2374 {
2375         release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2376         mxser_release_vector(brd);
2377 }
2378
2379 static int mxser_initbrd(struct mxser_board *brd,
2380                 struct pci_dev *pdev)
2381 {
2382         struct mxser_port *info;
2383         unsigned int i;
2384         int retval;
2385
2386         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2387                         brd->ports[0].max_baud);
2388
2389         for (i = 0; i < brd->info->nports; i++) {
2390                 info = &brd->ports[i];
2391                 tty_port_init(&info->port);
2392                 info->port.ops = &mxser_port_ops;
2393                 info->board = brd;
2394                 info->stop_rx = 0;
2395                 info->ldisc_stop_rx = 0;
2396
2397                 /* Enhance mode enabled here */
2398                 if (brd->chip_flag != MOXA_OTHER_UART)
2399                         mxser_enable_must_enchance_mode(info->ioaddr);
2400
2401                 info->type = brd->uart_type;
2402
2403                 process_txrx_fifo(info);
2404
2405                 info->custom_divisor = info->baud_base * 16;
2406                 info->port.close_delay = 5 * HZ / 10;
2407                 info->port.closing_wait = 30 * HZ;
2408                 info->normal_termios = mxvar_sdriver->init_termios;
2409                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2410                 info->err_shadow = 0;
2411                 spin_lock_init(&info->slock);
2412
2413                 /* before set INT ISR, disable all int */
2414                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2415                         info->ioaddr + UART_IER);
2416         }
2417
2418         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2419                         brd);
2420         if (retval) {
2421                 for (i = 0; i < brd->info->nports; i++)
2422                         tty_port_destroy(&brd->ports[i].port);
2423                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2424                         "conflict with another device.\n",
2425                         brd->info->name, brd->irq);
2426         }
2427
2428         return retval;
2429 }
2430
2431 static void mxser_board_remove(struct mxser_board *brd)
2432 {
2433         unsigned int i;
2434
2435         for (i = 0; i < brd->info->nports; i++) {
2436                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2437                 tty_port_destroy(&brd->ports[i].port);
2438         }
2439         free_irq(brd->irq, brd);
2440 }
2441
2442 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2443 {
2444         int id, i, bits, ret;
2445         unsigned short regs[16], irq;
2446         unsigned char scratch, scratch2;
2447
2448         brd->chip_flag = MOXA_OTHER_UART;
2449
2450         id = mxser_read_register(cap, regs);
2451         switch (id) {
2452         case C168_ASIC_ID:
2453                 brd->info = &mxser_cards[0];
2454                 break;
2455         case C104_ASIC_ID:
2456                 brd->info = &mxser_cards[1];
2457                 break;
2458         case CI104J_ASIC_ID:
2459                 brd->info = &mxser_cards[2];
2460                 break;
2461         case C102_ASIC_ID:
2462                 brd->info = &mxser_cards[5];
2463                 break;
2464         case CI132_ASIC_ID:
2465                 brd->info = &mxser_cards[6];
2466                 break;
2467         case CI134_ASIC_ID:
2468                 brd->info = &mxser_cards[7];
2469                 break;
2470         default:
2471                 return 0;
2472         }
2473
2474         irq = 0;
2475         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2476            Flag-hack checks if configuration should be read as 2-port here. */
2477         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2478                 irq = regs[9] & 0xF000;
2479                 irq = irq | (irq >> 4);
2480                 if (irq != (regs[9] & 0xFF00))
2481                         goto err_irqconflict;
2482         } else if (brd->info->nports == 4) {
2483                 irq = regs[9] & 0xF000;
2484                 irq = irq | (irq >> 4);
2485                 irq = irq | (irq >> 8);
2486                 if (irq != regs[9])
2487                         goto err_irqconflict;
2488         } else if (brd->info->nports == 8) {
2489                 irq = regs[9] & 0xF000;
2490                 irq = irq | (irq >> 4);
2491                 irq = irq | (irq >> 8);
2492                 if ((irq != regs[9]) || (irq != regs[10]))
2493                         goto err_irqconflict;
2494         }
2495
2496         if (!irq) {
2497                 printk(KERN_ERR "mxser: interrupt number unset\n");
2498                 return -EIO;
2499         }
2500         brd->irq = ((int)(irq & 0xF000) >> 12);
2501         for (i = 0; i < 8; i++)
2502                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2503         if ((regs[12] & 0x80) == 0) {
2504                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2505                 return -EIO;
2506         }
2507         brd->vector = (int)regs[11];    /* interrupt vector */
2508         if (id == 1)
2509                 brd->vector_mask = 0x00FF;
2510         else
2511                 brd->vector_mask = 0x000F;
2512         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2513                 if (regs[12] & bits) {
2514                         brd->ports[i].baud_base = 921600;
2515                         brd->ports[i].max_baud = 921600;
2516                 } else {
2517                         brd->ports[i].baud_base = 115200;
2518                         brd->ports[i].max_baud = 115200;
2519                 }
2520         }
2521         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2522         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2523         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2524         outb(scratch2, cap + UART_LCR);
2525         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2526         scratch = inb(cap + UART_IIR);
2527
2528         if (scratch & 0xC0)
2529                 brd->uart_type = PORT_16550A;
2530         else
2531                 brd->uart_type = PORT_16450;
2532         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2533                         "mxser(IO)")) {
2534                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2535                                 "0x%.8lx-0x%.8lx\n",
2536                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2537                                 8 * brd->info->nports - 1);
2538                 return -EIO;
2539         }
2540
2541         ret = mxser_request_vector(brd);
2542         if (ret) {
2543                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2544                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2545                                 "0x%.8lx-0x%.8lx\n",
2546                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2547                                 8 * brd->info->nports - 1);
2548                 return ret;
2549         }
2550         return brd->info->nports;
2551
2552 err_irqconflict:
2553         printk(KERN_ERR "mxser: invalid interrupt number\n");
2554         return -EIO;
2555 }
2556
2557 static int mxser_probe(struct pci_dev *pdev,
2558                 const struct pci_device_id *ent)
2559 {
2560 #ifdef CONFIG_PCI
2561         struct mxser_board *brd;
2562         unsigned int i, j;
2563         unsigned long ioaddress;
2564         struct device *tty_dev;
2565         int retval = -EINVAL;
2566
2567         for (i = 0; i < MXSER_BOARDS; i++)
2568                 if (mxser_boards[i].info == NULL)
2569                         break;
2570
2571         if (i >= MXSER_BOARDS) {
2572                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2573                                 "not configured\n", MXSER_BOARDS);
2574                 goto err;
2575         }
2576
2577         brd = &mxser_boards[i];
2578         brd->idx = i * MXSER_PORTS_PER_BOARD;
2579         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2580                 mxser_cards[ent->driver_data].name,
2581                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2582
2583         retval = pci_enable_device(pdev);
2584         if (retval) {
2585                 dev_err(&pdev->dev, "PCI enable failed\n");
2586                 goto err;
2587         }
2588
2589         /* io address */
2590         ioaddress = pci_resource_start(pdev, 2);
2591         retval = pci_request_region(pdev, 2, "mxser(IO)");
2592         if (retval)
2593                 goto err_dis;
2594
2595         brd->info = &mxser_cards[ent->driver_data];
2596         for (i = 0; i < brd->info->nports; i++)
2597                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2598
2599         /* vector */
2600         ioaddress = pci_resource_start(pdev, 3);
2601         retval = pci_request_region(pdev, 3, "mxser(vector)");
2602         if (retval)
2603                 goto err_zero;
2604         brd->vector = ioaddress;
2605
2606         /* irq */
2607         brd->irq = pdev->irq;
2608
2609         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2610         brd->uart_type = PORT_16550A;
2611         brd->vector_mask = 0;
2612
2613         for (i = 0; i < brd->info->nports; i++) {
2614                 for (j = 0; j < UART_INFO_NUM; j++) {
2615                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2616                                 brd->ports[i].max_baud =
2617                                         Gpci_uart_info[j].max_baud;
2618
2619                                 /* exception....CP-102 */
2620                                 if (brd->info->flags & MXSER_HIGHBAUD)
2621                                         brd->ports[i].max_baud = 921600;
2622                                 break;
2623                         }
2624                 }
2625         }
2626
2627         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2628                 for (i = 0; i < brd->info->nports; i++) {
2629                         if (i < 4)
2630                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2631                         else
2632                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2633                 }
2634                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2635                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2636         }
2637
2638         for (i = 0; i < brd->info->nports; i++) {
2639                 brd->vector_mask |= (1 << i);
2640                 brd->ports[i].baud_base = 921600;
2641         }
2642
2643         /* mxser_initbrd will hook ISR. */
2644         retval = mxser_initbrd(brd, pdev);
2645         if (retval)
2646                 goto err_rel3;
2647
2648         for (i = 0; i < brd->info->nports; i++) {
2649                 tty_dev = tty_port_register_device(&brd->ports[i].port,
2650                                 mxvar_sdriver, brd->idx + i, &pdev->dev);
2651                 if (IS_ERR(tty_dev)) {
2652                         retval = PTR_ERR(tty_dev);
2653                         for (; i > 0; i--)
2654                                 tty_unregister_device(mxvar_sdriver,
2655                                         brd->idx + i - 1);
2656                         goto err_relbrd;
2657                 }
2658         }
2659
2660         pci_set_drvdata(pdev, brd);
2661
2662         return 0;
2663 err_relbrd:
2664         for (i = 0; i < brd->info->nports; i++)
2665                 tty_port_destroy(&brd->ports[i].port);
2666         free_irq(brd->irq, brd);
2667 err_rel3:
2668         pci_release_region(pdev, 3);
2669 err_zero:
2670         brd->info = NULL;
2671         pci_release_region(pdev, 2);
2672 err_dis:
2673         pci_disable_device(pdev);
2674 err:
2675         return retval;
2676 #else
2677         return -ENODEV;
2678 #endif
2679 }
2680
2681 static void mxser_remove(struct pci_dev *pdev)
2682 {
2683 #ifdef CONFIG_PCI
2684         struct mxser_board *brd = pci_get_drvdata(pdev);
2685
2686         mxser_board_remove(brd);
2687
2688         pci_release_region(pdev, 2);
2689         pci_release_region(pdev, 3);
2690         pci_disable_device(pdev);
2691         brd->info = NULL;
2692 #endif
2693 }
2694
2695 static struct pci_driver mxser_driver = {
2696         .name = "mxser",
2697         .id_table = mxser_pcibrds,
2698         .probe = mxser_probe,
2699         .remove = mxser_remove
2700 };
2701
2702 static int __init mxser_module_init(void)
2703 {
2704         struct mxser_board *brd;
2705         struct device *tty_dev;
2706         unsigned int b, i, m;
2707         int retval;
2708
2709         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2710         if (!mxvar_sdriver)
2711                 return -ENOMEM;
2712
2713         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2714                 MXSER_VERSION);
2715
2716         /* Initialize the tty_driver structure */
2717         mxvar_sdriver->name = "ttyMI";
2718         mxvar_sdriver->major = ttymajor;
2719         mxvar_sdriver->minor_start = 0;
2720         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2721         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2722         mxvar_sdriver->init_termios = tty_std_termios;
2723         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2724         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2725         tty_set_operations(mxvar_sdriver, &mxser_ops);
2726
2727         retval = tty_register_driver(mxvar_sdriver);
2728         if (retval) {
2729                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2730                                 "tty driver !\n");
2731                 goto err_put;
2732         }
2733
2734         /* Start finding ISA boards here */
2735         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2736                 if (!ioaddr[b])
2737                         continue;
2738
2739                 brd = &mxser_boards[m];
2740                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2741                 if (retval <= 0) {
2742                         brd->info = NULL;
2743                         continue;
2744                 }
2745
2746                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2747                                 brd->info->name, ioaddr[b]);
2748
2749                 /* mxser_initbrd will hook ISR. */
2750                 if (mxser_initbrd(brd, NULL) < 0) {
2751                         mxser_release_ISA_res(brd);
2752                         brd->info = NULL;
2753                         continue;
2754                 }
2755
2756                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2757                 for (i = 0; i < brd->info->nports; i++) {
2758                         tty_dev = tty_port_register_device(&brd->ports[i].port,
2759                                         mxvar_sdriver, brd->idx + i, NULL);
2760                         if (IS_ERR(tty_dev)) {
2761                                 for (; i > 0; i--)
2762                                         tty_unregister_device(mxvar_sdriver,
2763                                                 brd->idx + i - 1);
2764                                 for (i = 0; i < brd->info->nports; i++)
2765                                         tty_port_destroy(&brd->ports[i].port);
2766                                 free_irq(brd->irq, brd);
2767                                 mxser_release_ISA_res(brd);
2768                                 brd->info = NULL;
2769                                 break;
2770                         }
2771                 }
2772                 if (brd->info == NULL)
2773                         continue;
2774
2775                 m++;
2776         }
2777
2778         retval = pci_register_driver(&mxser_driver);
2779         if (retval) {
2780                 printk(KERN_ERR "mxser: can't register pci driver\n");
2781                 if (!m) {
2782                         retval = -ENODEV;
2783                         goto err_unr;
2784                 } /* else: we have some ISA cards under control */
2785         }
2786
2787         return 0;
2788 err_unr:
2789         tty_unregister_driver(mxvar_sdriver);
2790 err_put:
2791         put_tty_driver(mxvar_sdriver);
2792         return retval;
2793 }
2794
2795 static void __exit mxser_module_exit(void)
2796 {
2797         unsigned int i;
2798
2799         pci_unregister_driver(&mxser_driver);
2800
2801         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2802                 if (mxser_boards[i].info != NULL)
2803                         mxser_board_remove(&mxser_boards[i]);
2804         tty_unregister_driver(mxvar_sdriver);
2805         put_tty_driver(mxvar_sdriver);
2806
2807         for (i = 0; i < MXSER_BOARDS; i++)
2808                 if (mxser_boards[i].info != NULL)
2809                         mxser_release_ISA_res(&mxser_boards[i]);
2810 }
2811
2812 module_init(mxser_module_init);
2813 module_exit(mxser_module_exit);