drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@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
  43 #include <asm/system.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.5"         /* 1.14 */
  51 #define MXSERMAJOR       174
  52
  53 #define MXSER_BOARDS            4       /* Max. boards */
  54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  56 #define MXSER_ISR_PASS_LIMIT    100
  57
  58 /*CheckIsMoxaMust return value*/
  59 #define MOXA_OTHER_UART         0x00
  60 #define MOXA_MUST_MU150_HWID    0x01
  61 #define MOXA_MUST_MU860_HWID    0x02
  62
  63 #define WAKEUP_CHARS            256
  64
  65 #define UART_MCR_AFE            0x20
  66 #define UART_LSR_SPECIAL        0x1E
  67
  68 #define PCI_DEVICE_ID_POS104UL  0x1044
  69 #define PCI_DEVICE_ID_CB108     0x1080
  70 #define PCI_DEVICE_ID_CP102UF   0x1023
  71 #define PCI_DEVICE_ID_CP112UL   0x1120
  72 #define PCI_DEVICE_ID_CB114     0x1142
  73 #define PCI_DEVICE_ID_CP114UL   0x1143
  74 #define PCI_DEVICE_ID_CB134I    0x1341
  75 #define PCI_DEVICE_ID_CP138U    0x1380
  76
  77
  78 #define C168_ASIC_ID    1
  79 #define C104_ASIC_ID    2
  80 #define C102_ASIC_ID    0xB
  81 #define CI132_ASIC_ID   4
  82 #define CI134_ASIC_ID   3
  83 #define CI104J_ASIC_ID  5
  84
  85 #define MXSER_HIGHBAUD  1
  86 #define MXSER_HAS2      2
  87
  88 /* This is only for PCI */
  89 static const struct {
  90         int type;
  91         int tx_fifo;
  92         int rx_fifo;
  93         int xmit_fifo_size;
  94         int rx_high_water;
  95         int rx_trigger;
  96         int rx_low_water;
  97         long max_baud;
  98 } Gpci_uart_info[] = {
  99         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 100         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 101         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 102 };
 103 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 104
 105 struct mxser_cardinfo {
 106         char *name;
 107         unsigned int nports;
 108         unsigned int flags;
 109 };
 110
 111 static const struct mxser_cardinfo mxser_cards[] = {
 112 /* 0*/  { "C168 series",        8, },
 113         { "C104 series",        4, },
 114         { "CI-104J series",     4, },
 115         { "C168H/PCI series",   8, },
 116         { "C104H/PCI series",   4, },
 117 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 118         { "CI-132 series",      4, MXSER_HAS2 },
 119         { "CI-134 series",      4, },
 120         { "CP-132 series",      2, },
 121         { "CP-114 series",      4, },
 122 /*10*/  { "CT-114 series",      4, },
 123         { "CP-102 series",      2, MXSER_HIGHBAUD },
 124         { "CP-104U series",     4, },
 125         { "CP-168U series",     8, },
 126         { "CP-132U series",     2, },
 127 /*15*/  { "CP-134U series",     4, },
 128         { "CP-104JU series",    4, },
 129         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 130         { "CP-118U series",     8, },
 131         { "CP-102UL series",    2, },
 132 /*20*/  { "CP-102U series",     2, },
 133         { "CP-118EL series",    8, },
 134         { "CP-168EL series",    8, },
 135         { "CP-104EL series",    4, },
 136         { "CB-108 series",      8, },
 137 /*25*/  { "CB-114 series",      4, },
 138         { "CB-134I series",     4, },
 139         { "CP-138U series",     8, },
 140         { "POS-104UL series",   4, },
 141         { "CP-114UL series",    4, },
 142 /*30*/  { "CP-102UF series",    2, },
 143         { "CP-112UL series",    2, },
 144 };
 145
 146 /* driver_data correspond to the lines in the structure above
 147    see also ISA probe function before you change something */
 148 static struct pci_device_id mxser_pcibrds[] = {
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),     .driver_data = 31 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 178
 179 static unsigned long ioaddr[MXSER_BOARDS];
 180 static int ttymajor = MXSERMAJOR;
 181
 182 /* Variables for insmod */
 183
 184 MODULE_AUTHOR("Casper Yang");
 185 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 186 module_param_array(ioaddr, ulong, NULL, 0);
 187 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 188 module_param(ttymajor, int, 0);
 189 MODULE_LICENSE("GPL");
 190
 191 struct mxser_log {
 192         int tick;
 193         unsigned long rxcnt[MXSER_PORTS];
 194         unsigned long txcnt[MXSER_PORTS];
 195 };
 196
 197 struct mxser_mon {
 198         unsigned long rxcnt;
 199         unsigned long txcnt;
 200         unsigned long up_rxcnt;
 201         unsigned long up_txcnt;
 202         int modem_status;
 203         unsigned char hold_reason;
 204 };
 205
 206 struct mxser_mon_ext {
 207         unsigned long rx_cnt[32];
 208         unsigned long tx_cnt[32];
 209         unsigned long up_rxcnt[32];
 210         unsigned long up_txcnt[32];
 211         int modem_status[32];
 212
 213         long baudrate[32];
 214         int databits[32];
 215         int stopbits[32];
 216         int parity[32];
 217         int flowctrl[32];
 218         int fifo[32];
 219         int iftype[32];
 220 };
 221
 222 struct mxser_board;
 223
 224 struct mxser_port {
 225         struct tty_port port;
 226         struct mxser_board *board;
 227
 228         unsigned long ioaddr;
 229         unsigned long opmode_ioaddr;
 230         int max_baud;
 231
 232         int rx_high_water;
 233         int rx_trigger;         /* Rx fifo trigger level */
 234         int rx_low_water;
 235         int baud_base;          /* max. speed */
 236         int type;               /* UART type */
 237
 238         int x_char;             /* xon/xoff character */
 239         int IER;                /* Interrupt Enable Register */
 240         int MCR;                /* Modem control register */
 241
 242         unsigned char stop_rx;
 243         unsigned char ldisc_stop_rx;
 244
 245         int custom_divisor;
 246         unsigned char err_shadow;
 247
 248         struct async_icount icount; /* kernel counters for 4 input interrupts */
 249         int timeout;
 250
 251         int read_status_mask;
 252         int ignore_status_mask;
 253         int xmit_fifo_size;
 254         int xmit_head;
 255         int xmit_tail;
 256         int xmit_cnt;
 257
 258         struct ktermios normal_termios;
 259
 260         struct mxser_mon mon_data;
 261
 262         spinlock_t slock;
 263 };
 264
 265 struct mxser_board {
 266         unsigned int idx;
 267         int irq;
 268         const struct mxser_cardinfo *info;
 269         unsigned long vector;
 270         unsigned long vector_mask;
 271
 272         int chip_flag;
 273         int uart_type;
 274
 275         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 276 };
 277
 278 struct mxser_mstatus {
 279         tcflag_t cflag;
 280         int cts;
 281         int dsr;
 282         int ri;
 283         int dcd;
 284 };
 285
 286 static struct mxser_board mxser_boards[MXSER_BOARDS];
 287 static struct tty_driver *mxvar_sdriver;
 288 static struct mxser_log mxvar_log;
 289 static int mxser_set_baud_method[MXSER_PORTS + 1];
 290
 291 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 292 {
 293         u8 oldlcr;
 294         u8 efr;
 295
 296         oldlcr = inb(baseio + UART_LCR);
 297         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 298
 299         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 300         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 301
 302         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 303         outb(oldlcr, baseio + UART_LCR);
 304 }
 305
 306 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 307 {
 308         u8 oldlcr;
 309         u8 efr;
 310
 311         oldlcr = inb(baseio + UART_LCR);
 312         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 313
 314         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 315         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 316
 317         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 318         outb(oldlcr, baseio + UART_LCR);
 319 }
 320
 321 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 322 {
 323         u8 oldlcr;
 324         u8 efr;
 325
 326         oldlcr = inb(baseio + UART_LCR);
 327         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 328
 329         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 330         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 331         efr |= MOXA_MUST_EFR_BANK0;
 332
 333         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 334         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 335         outb(oldlcr, baseio + UART_LCR);
 336 }
 337
 338 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 339 {
 340         u8 oldlcr;
 341         u8 efr;
 342
 343         oldlcr = inb(baseio + UART_LCR);
 344         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 345
 346         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 347         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 348         efr |= MOXA_MUST_EFR_BANK0;
 349
 350         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 351         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 352         outb(oldlcr, baseio + UART_LCR);
 353 }
 354
 355 static void mxser_set_must_fifo_value(struct mxser_port *info)
 356 {
 357         u8 oldlcr;
 358         u8 efr;
 359
 360         oldlcr = inb(info->ioaddr + UART_LCR);
 361         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 362
 363         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 364         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 365         efr |= MOXA_MUST_EFR_BANK1;
 366
 367         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 368         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 369         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 370         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 371         outb(oldlcr, info->ioaddr + UART_LCR);
 372 }
 373
 374 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 375 {
 376         u8 oldlcr;
 377         u8 efr;
 378
 379         oldlcr = inb(baseio + UART_LCR);
 380         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 381
 382         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 383         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 384         efr |= MOXA_MUST_EFR_BANK2;
 385
 386         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 387         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 388         outb(oldlcr, baseio + UART_LCR);
 389 }
 390
 391 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 392 {
 393         u8 oldlcr;
 394         u8 efr;
 395
 396         oldlcr = inb(baseio + UART_LCR);
 397         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 398
 399         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 400         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 401         efr |= MOXA_MUST_EFR_BANK2;
 402
 403         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 404         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 405         outb(oldlcr, baseio + UART_LCR);
 406 }
 407
 408 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 409 {
 410         u8 oldlcr;
 411         u8 efr;
 412
 413         oldlcr = inb(baseio + UART_LCR);
 414         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 415
 416         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 417         efr &= ~MOXA_MUST_EFR_SF_MASK;
 418
 419         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 420         outb(oldlcr, baseio + UART_LCR);
 421 }
 422
 423 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 424 {
 425         u8 oldlcr;
 426         u8 efr;
 427
 428         oldlcr = inb(baseio + UART_LCR);
 429         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 430
 431         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 432         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 433         efr |= MOXA_MUST_EFR_SF_TX1;
 434
 435         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 436         outb(oldlcr, baseio + UART_LCR);
 437 }
 438
 439 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 440 {
 441         u8 oldlcr;
 442         u8 efr;
 443
 444         oldlcr = inb(baseio + UART_LCR);
 445         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 446
 447         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 448         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 449
 450         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 451         outb(oldlcr, baseio + UART_LCR);
 452 }
 453
 454 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 455 {
 456         u8 oldlcr;
 457         u8 efr;
 458
 459         oldlcr = inb(baseio + UART_LCR);
 460         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 461
 462         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 463         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 464         efr |= MOXA_MUST_EFR_SF_RX1;
 465
 466         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 467         outb(oldlcr, baseio + UART_LCR);
 468 }
 469
 470 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 471 {
 472         u8 oldlcr;
 473         u8 efr;
 474
 475         oldlcr = inb(baseio + UART_LCR);
 476         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 477
 478         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 479         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 480
 481         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 482         outb(oldlcr, baseio + UART_LCR);
 483 }
 484
 485 #ifdef CONFIG_PCI
 486 static int __devinit CheckIsMoxaMust(unsigned long io)
 487 {
 488         u8 oldmcr, hwid;
 489         int i;
 490
 491         outb(0, io + UART_LCR);
 492         mxser_disable_must_enchance_mode(io);
 493         oldmcr = inb(io + UART_MCR);
 494         outb(0, io + UART_MCR);
 495         mxser_set_must_xon1_value(io, 0x11);
 496         if ((hwid = inb(io + UART_MCR)) != 0) {
 497                 outb(oldmcr, io + UART_MCR);
 498                 return MOXA_OTHER_UART;
 499         }
 500
 501         mxser_get_must_hardware_id(io, &hwid);
 502         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 503                 if (hwid == Gpci_uart_info[i].type)
 504                         return (int)hwid;
 505         }
 506         return MOXA_OTHER_UART;
 507 }
 508 #endif
 509
 510 static void process_txrx_fifo(struct mxser_port *info)
 511 {
 512         int i;
 513
 514         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 515                 info->rx_trigger = 1;
 516                 info->rx_high_water = 1;
 517                 info->rx_low_water = 1;
 518                 info->xmit_fifo_size = 1;
 519         } else
 520                 for (i = 0; i < UART_INFO_NUM; i++)
 521                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 522                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 523                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 524                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 525                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 526                                 break;
 527                         }
 528 }
 529
 530 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 531 {
 532         static unsigned char mxser_msr[MXSER_PORTS + 1];
 533         unsigned char status = 0;
 534
 535         status = inb(baseaddr + UART_MSR);
 536
 537         mxser_msr[port] &= 0x0F;
 538         mxser_msr[port] |= status;
 539         status = mxser_msr[port];
 540         if (mode)
 541                 mxser_msr[port] = 0;
 542
 543         return status;
 544 }
 545
 546 static int mxser_carrier_raised(struct tty_port *port)
 547 {
 548         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 549         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
 550 }
 551
 552 static void mxser_dtr_rts(struct tty_port *port, int on)
 553 {
 554         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 555         unsigned long flags;
 556
 557         spin_lock_irqsave(&mp->slock, flags);
 558         if (on)
 559                 outb(inb(mp->ioaddr + UART_MCR) |
 560                         UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
 561         else
 562                 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
 563                         mp->ioaddr + UART_MCR);
 564         spin_unlock_irqrestore(&mp->slock, flags);
 565 }
 566
 567 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 568 {
 569         struct mxser_port *info = tty->driver_data;
 570         int quot = 0, baud;
 571         unsigned char cval;
 572
 573         if (!info->ioaddr)
 574                 return -1;
 575
 576         if (newspd > info->max_baud)
 577                 return -1;
 578
 579         if (newspd == 134) {
 580                 quot = 2 * info->baud_base / 269;
 581                 tty_encode_baud_rate(tty, 134, 134);
 582         } else if (newspd) {
 583                 quot = info->baud_base / newspd;
 584                 if (quot == 0)
 585                         quot = 1;
 586                 baud = info->baud_base/quot;
 587                 tty_encode_baud_rate(tty, baud, baud);
 588         } else {
 589                 quot = 0;
 590         }
 591
 592         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 593         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 594
 595         if (quot) {
 596                 info->MCR |= UART_MCR_DTR;
 597                 outb(info->MCR, info->ioaddr + UART_MCR);
 598         } else {
 599                 info->MCR &= ~UART_MCR_DTR;
 600                 outb(info->MCR, info->ioaddr + UART_MCR);
 601                 return 0;
 602         }
 603
 604         cval = inb(info->ioaddr + UART_LCR);
 605
 606         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 607
 608         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 609         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 610         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 611
 612 #ifdef BOTHER
 613         if (C_BAUD(tty) == BOTHER) {
 614                 quot = info->baud_base % newspd;
 615                 quot *= 8;
 616                 if (quot % newspd > newspd / 2) {
 617                         quot /= newspd;
 618                         quot++;
 619                 } else
 620                         quot /= newspd;
 621
 622                 mxser_set_must_enum_value(info->ioaddr, quot);
 623         } else
 624 #endif
 625                 mxser_set_must_enum_value(info->ioaddr, 0);
 626
 627         return 0;
 628 }
 629
 630 /*
 631  * This routine is called to set the UART divisor registers to match
 632  * the specified baud rate for a serial port.
 633  */
 634 static int mxser_change_speed(struct tty_struct *tty,
 635                                         struct ktermios *old_termios)
 636 {
 637         struct mxser_port *info = tty->driver_data;
 638         unsigned cflag, cval, fcr;
 639         int ret = 0;
 640         unsigned char status;
 641
 642         cflag = tty->termios->c_cflag;
 643         if (!info->ioaddr)
 644                 return ret;
 645
 646         if (mxser_set_baud_method[tty->index] == 0)
 647                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 648
 649         /* byte size and parity */
 650         switch (cflag & CSIZE) {
 651         case CS5:
 652                 cval = 0x00;
 653                 break;
 654         case CS6:
 655                 cval = 0x01;
 656                 break;
 657         case CS7:
 658                 cval = 0x02;
 659                 break;
 660         case CS8:
 661                 cval = 0x03;
 662                 break;
 663         default:
 664                 cval = 0x00;
 665                 break;          /* too keep GCC shut... */
 666         }
 667         if (cflag & CSTOPB)
 668                 cval |= 0x04;
 669         if (cflag & PARENB)
 670                 cval |= UART_LCR_PARITY;
 671         if (!(cflag & PARODD))
 672                 cval |= UART_LCR_EPAR;
 673         if (cflag & CMSPAR)
 674                 cval |= UART_LCR_SPAR;
 675
 676         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 677                 if (info->board->chip_flag) {
 678                         fcr = UART_FCR_ENABLE_FIFO;
 679                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 680                         mxser_set_must_fifo_value(info);
 681                 } else
 682                         fcr = 0;
 683         } else {
 684                 fcr = UART_FCR_ENABLE_FIFO;
 685                 if (info->board->chip_flag) {
 686                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 687                         mxser_set_must_fifo_value(info);
 688                 } else {
 689                         switch (info->rx_trigger) {
 690                         case 1:
 691                                 fcr |= UART_FCR_TRIGGER_1;
 692                                 break;
 693                         case 4:
 694                                 fcr |= UART_FCR_TRIGGER_4;
 695                                 break;
 696                         case 8:
 697                                 fcr |= UART_FCR_TRIGGER_8;
 698                                 break;
 699                         default:
 700                                 fcr |= UART_FCR_TRIGGER_14;
 701                                 break;
 702                         }
 703                 }
 704         }
 705
 706         /* CTS flow control flag and modem status interrupts */
 707         info->IER &= ~UART_IER_MSI;
 708         info->MCR &= ~UART_MCR_AFE;
 709         if (cflag & CRTSCTS) {
 710                 info->port.flags |= ASYNC_CTS_FLOW;
 711                 info->IER |= UART_IER_MSI;
 712                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 713                         info->MCR |= UART_MCR_AFE;
 714                 } else {
 715                         status = inb(info->ioaddr + UART_MSR);
 716                         if (tty->hw_stopped) {
 717                                 if (status & UART_MSR_CTS) {
 718                                         tty->hw_stopped = 0;
 719                                         if (info->type != PORT_16550A &&
 720                                                         !info->board->chip_flag) {
 721                                                 outb(info->IER & ~UART_IER_THRI,
 722                                                         info->ioaddr +
 723                                                         UART_IER);
 724                                                 info->IER |= UART_IER_THRI;
 725                                                 outb(info->IER, info->ioaddr +
 726                                                                 UART_IER);
 727                                         }
 728                                         tty_wakeup(tty);
 729                                 }
 730                         } else {
 731                                 if (!(status & UART_MSR_CTS)) {
 732                                         tty->hw_stopped = 1;
 733                                         if ((info->type != PORT_16550A) &&
 734                                                         (!info->board->chip_flag)) {
 735                                                 info->IER &= ~UART_IER_THRI;
 736                                                 outb(info->IER, info->ioaddr +
 737                                                                 UART_IER);
 738                                         }
 739                                 }
 740                         }
 741                 }
 742         } else {
 743                 info->port.flags &= ~ASYNC_CTS_FLOW;
 744         }
 745         outb(info->MCR, info->ioaddr + UART_MCR);
 746         if (cflag & CLOCAL) {
 747                 info->port.flags &= ~ASYNC_CHECK_CD;
 748         } else {
 749                 info->port.flags |= ASYNC_CHECK_CD;
 750                 info->IER |= UART_IER_MSI;
 751         }
 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 ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 825                 if (status & UART_MSR_DCD)
 826                         wake_up_interruptible(&port->port.open_wait);
 827         }
 828
 829         if (port->port.flags & ASYNC_CTS_FLOW) {
 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
 864         page = __get_free_page(GFP_KERNEL);
 865         if (!page)
 866                 return -ENOMEM;
 867
 868         spin_lock_irqsave(&info->slock, flags);
 869
 870         if (!info->ioaddr || !info->type) {
 871                 set_bit(TTY_IO_ERROR, &tty->flags);
 872                 free_page(page);
 873                 spin_unlock_irqrestore(&info->slock, flags);
 874                 return 0;
 875         }
 876         info->port.xmit_buf = (unsigned char *) page;
 877
 878         /*
 879          * Clear the FIFO buffers and disable them
 880          * (they will be reenabled in mxser_change_speed())
 881          */
 882         if (info->board->chip_flag)
 883                 outb((UART_FCR_CLEAR_RCVR |
 884                         UART_FCR_CLEAR_XMIT |
 885                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 886         else
 887                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 888                         info->ioaddr + UART_FCR);
 889
 890         /*
 891          * At this point there's no way the LSR could still be 0xFF;
 892          * if it is, then bail out, because there's likely no UART
 893          * here.
 894          */
 895         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 896                 spin_unlock_irqrestore(&info->slock, flags);
 897                 if (capable(CAP_SYS_ADMIN)) {
 898                         set_bit(TTY_IO_ERROR, &tty->flags);
 899                         return 0;
 900                 } else
 901                         return -ENODEV;
 902         }
 903
 904         /*
 905          * Clear the interrupt registers.
 906          */
 907         (void) inb(info->ioaddr + UART_LSR);
 908         (void) inb(info->ioaddr + UART_RX);
 909         (void) inb(info->ioaddr + UART_IIR);
 910         (void) inb(info->ioaddr + UART_MSR);
 911
 912         /*
 913          * Now, initialize the UART
 914          */
 915         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 916         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 917         outb(info->MCR, info->ioaddr + UART_MCR);
 918
 919         /*
 920          * Finally, enable interrupts
 921          */
 922         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 923
 924         if (info->board->chip_flag)
 925                 info->IER |= MOXA_MUST_IER_EGDAI;
 926         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 927
 928         /*
 929          * And clear the interrupt registers again for luck.
 930          */
 931         (void) inb(info->ioaddr + UART_LSR);
 932         (void) inb(info->ioaddr + UART_RX);
 933         (void) inb(info->ioaddr + UART_IIR);
 934         (void) inb(info->ioaddr + UART_MSR);
 935
 936         clear_bit(TTY_IO_ERROR, &tty->flags);
 937         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 938
 939         /*
 940          * and set the speed of the serial port
 941          */
 942         mxser_change_speed(tty, NULL);
 943         spin_unlock_irqrestore(&info->slock, flags);
 944
 945         return 0;
 946 }
 947
 948 /*
 949  * This routine will shutdown a serial port
 950  */
 951 static void mxser_shutdown_port(struct tty_port *port)
 952 {
 953         struct mxser_port *info = container_of(port, struct mxser_port, port);
 954         unsigned long flags;
 955
 956         spin_lock_irqsave(&info->slock, flags);
 957
 958         /*
 959          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 960          * here so the queue might never be waken up
 961          */
 962         wake_up_interruptible(&info->port.delta_msr_wait);
 963
 964         /*
 965          * Free the xmit buffer, if necessary
 966          */
 967         if (info->port.xmit_buf) {
 968                 free_page((unsigned long) info->port.xmit_buf);
 969                 info->port.xmit_buf = NULL;
 970         }
 971
 972         info->IER = 0;
 973         outb(0x00, info->ioaddr + UART_IER);
 974
 975         /* clear Rx/Tx FIFO's */
 976         if (info->board->chip_flag)
 977                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 978                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 979                                 info->ioaddr + UART_FCR);
 980         else
 981                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 982                         info->ioaddr + UART_FCR);
 983
 984         /* read data port to reset things */
 985         (void) inb(info->ioaddr + UART_RX);
 986
 987
 988         if (info->board->chip_flag)
 989                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 990
 991         spin_unlock_irqrestore(&info->slock, flags);
 992 }
 993
 994 /*
 995  * This routine is called whenever a serial port is opened.  It
 996  * enables interrupts for a serial port, linking in its async structure into
 997  * the IRQ chain.   It also performs the serial-specific
 998  * initialization for the tty structure.
 999  */
1000 static int mxser_open(struct tty_struct *tty, struct file *filp)
1001 {
1002         struct mxser_port *info;
1003         int line;
1004
1005         line = tty->index;
1006         if (line == MXSER_PORTS)
1007                 return 0;
1008         if (line < 0 || line > MXSER_PORTS)
1009                 return -ENODEV;
1010         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1011         if (!info->ioaddr)
1012                 return -ENODEV;
1013
1014         tty->driver_data = info;
1015         return tty_port_open(&info->port, tty, filp);
1016 }
1017
1018 static void mxser_flush_buffer(struct tty_struct *tty)
1019 {
1020         struct mxser_port *info = tty->driver_data;
1021         char fcr;
1022         unsigned long flags;
1023
1024
1025         spin_lock_irqsave(&info->slock, flags);
1026         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1027
1028         fcr = inb(info->ioaddr + UART_FCR);
1029         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1030                 info->ioaddr + UART_FCR);
1031         outb(fcr, info->ioaddr + UART_FCR);
1032
1033         spin_unlock_irqrestore(&info->slock, flags);
1034
1035         tty_wakeup(tty);
1036 }
1037
1038
1039 static void mxser_close_port(struct tty_port *port)
1040 {
1041         struct mxser_port *info = container_of(port, struct mxser_port, port);
1042         unsigned long timeout;
1043         /*
1044          * At this point we stop accepting input.  To do this, we
1045          * disable the receive line status interrupts, and tell the
1046          * interrupt driver to stop checking the data ready bit in the
1047          * line status register.
1048          */
1049         info->IER &= ~UART_IER_RLSI;
1050         if (info->board->chip_flag)
1051                 info->IER &= ~MOXA_MUST_RECV_ISR;
1052
1053         outb(info->IER, info->ioaddr + UART_IER);
1054         /*
1055          * Before we drop DTR, make sure the UART transmitter
1056          * has completely drained; this is especially
1057          * important if there is a transmit FIFO!
1058          */
1059         timeout = jiffies + HZ;
1060         while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1061                 schedule_timeout_interruptible(5);
1062                 if (time_after(jiffies, timeout))
1063                         break;
1064         }
1065 }
1066
1067 /*
1068  * This routine is called when the serial port gets closed.  First, we
1069  * wait for the last remaining data to be sent.  Then, we unlink its
1070  * async structure from the interrupt chain if necessary, and we free
1071  * that IRQ if nothing is left in the chain.
1072  */
1073 static void mxser_close(struct tty_struct *tty, struct file *filp)
1074 {
1075         struct mxser_port *info = tty->driver_data;
1076         struct tty_port *port = &info->port;
1077
1078         if (tty->index == MXSER_PORTS || info == NULL)
1079                 return;
1080         if (tty_port_close_start(port, tty, filp) == 0)
1081                 return;
1082         mutex_lock(&port->mutex);
1083         mxser_close_port(port);
1084         mxser_flush_buffer(tty);
1085         mxser_shutdown_port(port);
1086         clear_bit(ASYNCB_INITIALIZED, &port->flags);
1087         mutex_unlock(&port->mutex);
1088         /* Right now the tty_port set is done outside of the close_end helper
1089            as we don't yet have everyone using refcounts */
1090         tty_port_close_end(port, tty);
1091         tty_port_tty_set(port, NULL);
1092 }
1093
1094 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1095 {
1096         int c, total = 0;
1097         struct mxser_port *info = tty->driver_data;
1098         unsigned long flags;
1099
1100         if (!info->port.xmit_buf)
1101                 return 0;
1102
1103         while (1) {
1104                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1105                                           SERIAL_XMIT_SIZE - info->xmit_head));
1106                 if (c <= 0)
1107                         break;
1108
1109                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1110                 spin_lock_irqsave(&info->slock, flags);
1111                 info->xmit_head = (info->xmit_head + c) &
1112                                   (SERIAL_XMIT_SIZE - 1);
1113                 info->xmit_cnt += c;
1114                 spin_unlock_irqrestore(&info->slock, flags);
1115
1116                 buf += c;
1117                 count -= c;
1118                 total += c;
1119         }
1120
1121         if (info->xmit_cnt && !tty->stopped) {
1122                 if (!tty->hw_stopped ||
1123                                 (info->type == PORT_16550A) ||
1124                                 (info->board->chip_flag)) {
1125                         spin_lock_irqsave(&info->slock, flags);
1126                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1127                                         UART_IER);
1128                         info->IER |= UART_IER_THRI;
1129                         outb(info->IER, info->ioaddr + UART_IER);
1130                         spin_unlock_irqrestore(&info->slock, flags);
1131                 }
1132         }
1133         return total;
1134 }
1135
1136 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1137 {
1138         struct mxser_port *info = tty->driver_data;
1139         unsigned long flags;
1140
1141         if (!info->port.xmit_buf)
1142                 return 0;
1143
1144         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1145                 return 0;
1146
1147         spin_lock_irqsave(&info->slock, flags);
1148         info->port.xmit_buf[info->xmit_head++] = ch;
1149         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1150         info->xmit_cnt++;
1151         spin_unlock_irqrestore(&info->slock, flags);
1152         if (!tty->stopped) {
1153                 if (!tty->hw_stopped ||
1154                                 (info->type == PORT_16550A) ||
1155                                 info->board->chip_flag) {
1156                         spin_lock_irqsave(&info->slock, flags);
1157                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1158                         info->IER |= UART_IER_THRI;
1159                         outb(info->IER, info->ioaddr + UART_IER);
1160                         spin_unlock_irqrestore(&info->slock, flags);
1161                 }
1162         }
1163         return 1;
1164 }
1165
1166
1167 static void mxser_flush_chars(struct tty_struct *tty)
1168 {
1169         struct mxser_port *info = tty->driver_data;
1170         unsigned long flags;
1171
1172         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1173                         (tty->hw_stopped && info->type != PORT_16550A &&
1174                          !info->board->chip_flag))
1175                 return;
1176
1177         spin_lock_irqsave(&info->slock, flags);
1178
1179         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1180         info->IER |= UART_IER_THRI;
1181         outb(info->IER, info->ioaddr + UART_IER);
1182
1183         spin_unlock_irqrestore(&info->slock, flags);
1184 }
1185
1186 static int mxser_write_room(struct tty_struct *tty)
1187 {
1188         struct mxser_port *info = tty->driver_data;
1189         int ret;
1190
1191         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1192         return ret < 0 ? 0 : ret;
1193 }
1194
1195 static int mxser_chars_in_buffer(struct tty_struct *tty)
1196 {
1197         struct mxser_port *info = tty->driver_data;
1198         return info->xmit_cnt;
1199 }
1200
1201 /*
1202  * ------------------------------------------------------------
1203  * friends of mxser_ioctl()
1204  * ------------------------------------------------------------
1205  */
1206 static int mxser_get_serial_info(struct tty_struct *tty,
1207                 struct serial_struct __user *retinfo)
1208 {
1209         struct mxser_port *info = tty->driver_data;
1210         struct serial_struct tmp = {
1211                 .type = info->type,
1212                 .line = tty->index,
1213                 .port = info->ioaddr,
1214                 .irq = info->board->irq,
1215                 .flags = info->port.flags,
1216                 .baud_base = info->baud_base,
1217                 .close_delay = info->port.close_delay,
1218                 .closing_wait = info->port.closing_wait,
1219                 .custom_divisor = info->custom_divisor,
1220                 .hub6 = 0
1221         };
1222         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1223                 return -EFAULT;
1224         return 0;
1225 }
1226
1227 static int mxser_set_serial_info(struct tty_struct *tty,
1228                 struct serial_struct __user *new_info)
1229 {
1230         struct mxser_port *info = tty->driver_data;
1231         struct tty_port *port = &info->port;
1232         struct serial_struct new_serial;
1233         speed_t baud;
1234         unsigned long sl_flags;
1235         unsigned int flags;
1236         int retval = 0;
1237
1238         if (!new_info || !info->ioaddr)
1239                 return -ENODEV;
1240         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1241                 return -EFAULT;
1242
1243         if (new_serial.irq != info->board->irq ||
1244                         new_serial.port != info->ioaddr)
1245                 return -EINVAL;
1246
1247         flags = port->flags & ASYNC_SPD_MASK;
1248
1249         if (!capable(CAP_SYS_ADMIN)) {
1250                 if ((new_serial.baud_base != info->baud_base) ||
1251                                 (new_serial.close_delay != info->port.close_delay) ||
1252                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1253                         return -EPERM;
1254                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1255                                 (new_serial.flags & ASYNC_USR_MASK));
1256         } else {
1257                 /*
1258                  * OK, past this point, all the error checking has been done.
1259                  * At this point, we start making changes.....
1260                  */
1261                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1262                                 (new_serial.flags & ASYNC_FLAGS));
1263                 port->close_delay = new_serial.close_delay * HZ / 100;
1264                 port->closing_wait = new_serial.closing_wait * HZ / 100;
1265                 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1266                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1267                                 (new_serial.baud_base != info->baud_base ||
1268                                 new_serial.custom_divisor !=
1269                                 info->custom_divisor)) {
1270                         if (new_serial.custom_divisor == 0)
1271                                 return -EINVAL;
1272                         baud = new_serial.baud_base / new_serial.custom_divisor;
1273                         tty_encode_baud_rate(tty, baud, baud);
1274                 }
1275         }
1276
1277         info->type = new_serial.type;
1278
1279         process_txrx_fifo(info);
1280
1281         if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
1282                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1283                         spin_lock_irqsave(&info->slock, sl_flags);
1284                         mxser_change_speed(tty, NULL);
1285                         spin_unlock_irqrestore(&info->slock, sl_flags);
1286                 }
1287         } else {
1288                 retval = mxser_activate(port, tty);
1289                 if (retval == 0)
1290                         set_bit(ASYNCB_INITIALIZED, &port->flags);
1291         }
1292         return retval;
1293 }
1294
1295 /*
1296  * mxser_get_lsr_info - get line status register info
1297  *
1298  * Purpose: Let user call ioctl() to get info when the UART physically
1299  *          is emptied.  On bus types like RS485, the transmitter must
1300  *          release the bus after transmitting. This must be done when
1301  *          the transmit shift register is empty, not be done when the
1302  *          transmit holding register is empty.  This functionality
1303  *          allows an RS485 driver to be written in user space.
1304  */
1305 static int mxser_get_lsr_info(struct mxser_port *info,
1306                 unsigned int __user *value)
1307 {
1308         unsigned char status;
1309         unsigned int result;
1310         unsigned long flags;
1311
1312         spin_lock_irqsave(&info->slock, flags);
1313         status = inb(info->ioaddr + UART_LSR);
1314         spin_unlock_irqrestore(&info->slock, flags);
1315         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1316         return put_user(result, value);
1317 }
1318
1319 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1320 {
1321         struct mxser_port *info = tty->driver_data;
1322         unsigned char control, status;
1323         unsigned long flags;
1324
1325
1326         if (tty->index == MXSER_PORTS)
1327                 return -ENOIOCTLCMD;
1328         if (test_bit(TTY_IO_ERROR, &tty->flags))
1329                 return -EIO;
1330
1331         control = info->MCR;
1332
1333         spin_lock_irqsave(&info->slock, flags);
1334         status = inb(info->ioaddr + UART_MSR);
1335         if (status & UART_MSR_ANY_DELTA)
1336                 mxser_check_modem_status(tty, info, status);
1337         spin_unlock_irqrestore(&info->slock, flags);
1338         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1339                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1340                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1341                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1342                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1343                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1344 }
1345
1346 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1347                 unsigned int set, unsigned int clear)
1348 {
1349         struct mxser_port *info = tty->driver_data;
1350         unsigned long flags;
1351
1352
1353         if (tty->index == MXSER_PORTS)
1354                 return -ENOIOCTLCMD;
1355         if (test_bit(TTY_IO_ERROR, &tty->flags))
1356                 return -EIO;
1357
1358         spin_lock_irqsave(&info->slock, flags);
1359
1360         if (set & TIOCM_RTS)
1361                 info->MCR |= UART_MCR_RTS;
1362         if (set & TIOCM_DTR)
1363                 info->MCR |= UART_MCR_DTR;
1364
1365         if (clear & TIOCM_RTS)
1366                 info->MCR &= ~UART_MCR_RTS;
1367         if (clear & TIOCM_DTR)
1368                 info->MCR &= ~UART_MCR_DTR;
1369
1370         outb(info->MCR, info->ioaddr + UART_MCR);
1371         spin_unlock_irqrestore(&info->slock, flags);
1372         return 0;
1373 }
1374
1375 static int __init mxser_program_mode(int port)
1376 {
1377         int id, i, j, n;
1378
1379         outb(0, port);
1380         outb(0, port);
1381         outb(0, port);
1382         (void)inb(port);
1383         (void)inb(port);
1384         outb(0, port);
1385         (void)inb(port);
1386
1387         id = inb(port + 1) & 0x1F;
1388         if ((id != C168_ASIC_ID) &&
1389                         (id != C104_ASIC_ID) &&
1390                         (id != C102_ASIC_ID) &&
1391                         (id != CI132_ASIC_ID) &&
1392                         (id != CI134_ASIC_ID) &&
1393                         (id != CI104J_ASIC_ID))
1394                 return -1;
1395         for (i = 0, j = 0; i < 4; i++) {
1396                 n = inb(port + 2);
1397                 if (n == 'M') {
1398                         j = 1;
1399                 } else if ((j == 1) && (n == 1)) {
1400                         j = 2;
1401                         break;
1402                 } else
1403                         j = 0;
1404         }
1405         if (j != 2)
1406                 id = -2;
1407         return id;
1408 }
1409
1410 static void __init mxser_normal_mode(int port)
1411 {
1412         int i, n;
1413
1414         outb(0xA5, port + 1);
1415         outb(0x80, port + 3);
1416         outb(12, port + 0);     /* 9600 bps */
1417         outb(0, port + 1);
1418         outb(0x03, port + 3);   /* 8 data bits */
1419         outb(0x13, port + 4);   /* loop back mode */
1420         for (i = 0; i < 16; i++) {
1421                 n = inb(port + 5);
1422                 if ((n & 0x61) == 0x60)
1423                         break;
1424                 if ((n & 1) == 1)
1425                         (void)inb(port);
1426         }
1427         outb(0x00, port + 4);
1428 }
1429
1430 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1431 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1432 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1433 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1434 #define EN_CCMD         0x000   /* Chip's command register     */
1435 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1436 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1437 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1438 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1439 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1440 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1441 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1442 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1443 static int __init mxser_read_register(int port, unsigned short *regs)
1444 {
1445         int i, k, value, id;
1446         unsigned int j;
1447
1448         id = mxser_program_mode(port);
1449         if (id < 0)
1450                 return id;
1451         for (i = 0; i < 14; i++) {
1452                 k = (i & 0x3F) | 0x180;
1453                 for (j = 0x100; j > 0; j >>= 1) {
1454                         outb(CHIP_CS, port);
1455                         if (k & j) {
1456                                 outb(CHIP_CS | CHIP_DO, port);
1457                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1458                         } else {
1459                                 outb(CHIP_CS, port);
1460                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1461                         }
1462                 }
1463                 (void)inb(port);
1464                 value = 0;
1465                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1466                         outb(CHIP_CS, port);
1467                         outb(CHIP_CS | CHIP_SK, port);
1468                         if (inb(port) & CHIP_DI)
1469                                 value |= j;
1470                 }
1471                 regs[i] = value;
1472                 outb(0, port);
1473         }
1474         mxser_normal_mode(port);
1475         return id;
1476 }
1477
1478 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1479 {
1480         struct mxser_port *ip;
1481         struct tty_port *port;
1482         struct tty_struct *tty;
1483         int result, status;
1484         unsigned int i, j;
1485         int ret = 0;
1486
1487         switch (cmd) {
1488         case MOXA_GET_MAJOR:
1489                 if (printk_ratelimit())
1490                         printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1491                                         "%x (GET_MAJOR), fix your userspace\n",
1492                                         current->comm, cmd);
1493                 return put_user(ttymajor, (int __user *)argp);
1494
1495         case MOXA_CHKPORTENABLE:
1496                 result = 0;
1497                 for (i = 0; i < MXSER_BOARDS; i++)
1498                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1499                                 if (mxser_boards[i].ports[j].ioaddr)
1500                                         result |= (1 << i);
1501                 return put_user(result, (unsigned long __user *)argp);
1502         case MOXA_GETDATACOUNT:
1503                 /* The receive side is locked by port->slock but it isn't
1504                    clear that an exact snapshot is worth copying here */
1505                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1506                         ret = -EFAULT;
1507                 return ret;
1508         case MOXA_GETMSTATUS: {
1509                 struct mxser_mstatus ms, __user *msu = argp;
1510                 for (i = 0; i < MXSER_BOARDS; i++)
1511                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1512                                 ip = &mxser_boards[i].ports[j];
1513                                 port = &ip->port;
1514                                 memset(&ms, 0, sizeof(ms));
1515
1516                                 mutex_lock(&port->mutex);
1517                                 if (!ip->ioaddr)
1518                                         goto copy;
1519
1520                                 tty = tty_port_tty_get(port);
1521
1522                                 if (!tty || !tty->termios)
1523                                         ms.cflag = ip->normal_termios.c_cflag;
1524                                 else
1525                                         ms.cflag = tty->termios->c_cflag;
1526                                 tty_kref_put(tty);
1527                                 spin_lock_irq(&ip->slock);
1528                                 status = inb(ip->ioaddr + UART_MSR);
1529                                 spin_unlock_irq(&ip->slock);
1530                                 if (status & UART_MSR_DCD)
1531                                         ms.dcd = 1;
1532                                 if (status & UART_MSR_DSR)
1533                                         ms.dsr = 1;
1534                                 if (status & UART_MSR_CTS)
1535                                         ms.cts = 1;
1536                         copy:
1537                                 mutex_unlock(&port->mutex);
1538                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1539                                         return -EFAULT;
1540                                 msu++;
1541                         }
1542                 return 0;
1543         }
1544         case MOXA_ASPP_MON_EXT: {
1545                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1546                 unsigned int cflag, iflag, p;
1547                 u8 opmode;
1548
1549                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1550                 if (!me)
1551                         return -ENOMEM;
1552
1553                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1554                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1555                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1556                                         i = MXSER_BOARDS;
1557                                         break;
1558                                 }
1559                                 ip = &mxser_boards[i].ports[j];
1560                                 port = &ip->port;
1561
1562                                 mutex_lock(&port->mutex);
1563                                 if (!ip->ioaddr) {
1564                                         mutex_unlock(&port->mutex);
1565                                         continue;
1566                                 }
1567
1568                                 spin_lock_irq(&ip->slock);
1569                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1570
1571                                 if (status & UART_MSR_TERI)
1572                                         ip->icount.rng++;
1573                                 if (status & UART_MSR_DDSR)
1574                                         ip->icount.dsr++;
1575                                 if (status & UART_MSR_DDCD)
1576                                         ip->icount.dcd++;
1577                                 if (status & UART_MSR_DCTS)
1578                                         ip->icount.cts++;
1579
1580                                 ip->mon_data.modem_status = status;
1581                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1582                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1583                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1584                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1585                                 me->modem_status[p] =
1586                                         ip->mon_data.modem_status;
1587                                 spin_unlock_irq(&ip->slock);
1588
1589                                 tty = tty_port_tty_get(&ip->port);
1590
1591                                 if (!tty || !tty->termios) {
1592                                         cflag = ip->normal_termios.c_cflag;
1593                                         iflag = ip->normal_termios.c_iflag;
1594                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1595                                 } else {
1596                                         cflag = tty->termios->c_cflag;
1597                                         iflag = tty->termios->c_iflag;
1598                                         me->baudrate[p] = tty_get_baud_rate(tty);
1599                                 }
1600                                 tty_kref_put(tty);
1601
1602                                 me->databits[p] = cflag & CSIZE;
1603                                 me->stopbits[p] = cflag & CSTOPB;
1604                                 me->parity[p] = cflag & (PARENB | PARODD |
1605                                                 CMSPAR);
1606
1607                                 if (cflag & CRTSCTS)
1608                                         me->flowctrl[p] |= 0x03;
1609
1610                                 if (iflag & (IXON | IXOFF))
1611                                         me->flowctrl[p] |= 0x0C;
1612
1613                                 if (ip->type == PORT_16550A)
1614                                         me->fifo[p] = 1;
1615
1616                                 opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1617                                 opmode &= OP_MODE_MASK;
1618                                 me->iftype[p] = opmode;
1619                                 mutex_unlock(&port->mutex);
1620                         }
1621                 }
1622                 if (copy_to_user(argp, me, sizeof(*me)))
1623                         ret = -EFAULT;
1624                 kfree(me);
1625                 return ret;
1626         }
1627         default:
1628                 return -ENOIOCTLCMD;
1629         }
1630         return 0;
1631 }
1632
1633 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1634                 struct async_icount *cprev)
1635 {
1636         struct async_icount cnow;
1637         unsigned long flags;
1638         int ret;
1639
1640         spin_lock_irqsave(&info->slock, flags);
1641         cnow = info->icount;    /* atomic copy */
1642         spin_unlock_irqrestore(&info->slock, flags);
1643
1644         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1645                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1646                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1647                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1648
1649         *cprev = cnow;
1650
1651         return ret;
1652 }
1653
1654 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1655                 unsigned int cmd, unsigned long arg)
1656 {
1657         struct mxser_port *info = tty->driver_data;
1658         struct tty_port *port = &info->port;
1659         struct async_icount cnow;
1660         unsigned long flags;
1661         void __user *argp = (void __user *)arg;
1662         int retval;
1663
1664         if (tty->index == MXSER_PORTS)
1665                 return mxser_ioctl_special(cmd, argp);
1666
1667         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1668                 int p;
1669                 unsigned long opmode;
1670                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1671                 int shiftbit;
1672                 unsigned char val, mask;
1673
1674                 p = tty->index % 4;
1675                 if (cmd == MOXA_SET_OP_MODE) {
1676                         if (get_user(opmode, (int __user *) argp))
1677                                 return -EFAULT;
1678                         if (opmode != RS232_MODE &&
1679                                         opmode != RS485_2WIRE_MODE &&
1680                                         opmode != RS422_MODE &&
1681                                         opmode != RS485_4WIRE_MODE)
1682                                 return -EFAULT;
1683                         mask = ModeMask[p];
1684                         shiftbit = p * 2;
1685                         spin_lock_irq(&info->slock);
1686                         val = inb(info->opmode_ioaddr);
1687                         val &= mask;
1688                         val |= (opmode << shiftbit);
1689                         outb(val, info->opmode_ioaddr);
1690                         spin_unlock_irq(&info->slock);
1691                 } else {
1692                         shiftbit = p * 2;
1693                         spin_lock_irq(&info->slock);
1694                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1695                         spin_unlock_irq(&info->slock);
1696                         opmode &= OP_MODE_MASK;
1697                         if (put_user(opmode, (int __user *)argp))
1698                                 return -EFAULT;
1699                 }
1700                 return 0;
1701         }
1702
1703         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1704                         test_bit(TTY_IO_ERROR, &tty->flags))
1705                 return -EIO;
1706
1707         switch (cmd) {
1708         case TIOCGSERIAL:
1709                 mutex_lock(&port->mutex);
1710                 retval = mxser_get_serial_info(tty, argp);
1711                 mutex_unlock(&port->mutex);
1712                 return retval;
1713         case TIOCSSERIAL:
1714                 mutex_lock(&port->mutex);
1715                 retval = mxser_set_serial_info(tty, argp);
1716                 mutex_unlock(&port->mutex);
1717                 return retval;
1718         case TIOCSERGETLSR:     /* Get line status register */
1719                 return  mxser_get_lsr_info(info, argp);
1720                 /*
1721                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1722                  * - mask passed in arg for lines of interest
1723                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1724                  * Caller should use TIOCGICOUNT to see which one it was
1725                  */
1726         case TIOCMIWAIT:
1727                 spin_lock_irqsave(&info->slock, flags);
1728                 cnow = info->icount;    /* note the counters on entry */
1729                 spin_unlock_irqrestore(&info->slock, flags);
1730
1731                 return wait_event_interruptible(info->port.delta_msr_wait,
1732                                 mxser_cflags_changed(info, arg, &cnow));
1733         /*
1734          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1735          * Return: write counters to the user passed counter struct
1736          * NB: both 1->0 and 0->1 transitions are counted except for
1737          *     RI where only 0->1 is counted.
1738          */
1739         case TIOCGICOUNT: {
1740                 struct serial_icounter_struct icnt = { 0 };
1741                 spin_lock_irqsave(&info->slock, flags);
1742                 cnow = info->icount;
1743                 spin_unlock_irqrestore(&info->slock, flags);
1744
1745                 icnt.frame = cnow.frame;
1746                 icnt.brk = cnow.brk;
1747                 icnt.overrun = cnow.overrun;
1748                 icnt.buf_overrun = cnow.buf_overrun;
1749                 icnt.parity = cnow.parity;
1750                 icnt.rx = cnow.rx;
1751                 icnt.tx = cnow.tx;
1752                 icnt.cts = cnow.cts;
1753                 icnt.dsr = cnow.dsr;
1754                 icnt.rng = cnow.rng;
1755                 icnt.dcd = cnow.dcd;
1756
1757                 return copy_to_user(argp, &icnt, sizeof(icnt)) ? -EFAULT : 0;
1758         }
1759         case MOXA_HighSpeedOn:
1760                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1761         case MOXA_SDS_RSTICOUNTER:
1762                 spin_lock_irq(&info->slock);
1763                 info->mon_data.rxcnt = 0;
1764                 info->mon_data.txcnt = 0;
1765                 spin_unlock_irq(&info->slock);
1766                 return 0;
1767
1768         case MOXA_ASPP_OQUEUE:{
1769                 int len, lsr;
1770
1771                 len = mxser_chars_in_buffer(tty);
1772                 spin_lock_irq(&info->slock);
1773                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1774                 spin_unlock_irq(&info->slock);
1775                 len += (lsr ? 0 : 1);
1776
1777                 return put_user(len, (int __user *)argp);
1778         }
1779         case MOXA_ASPP_MON: {
1780                 int mcr, status;
1781
1782                 spin_lock_irq(&info->slock);
1783                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1784                 mxser_check_modem_status(tty, info, status);
1785
1786                 mcr = inb(info->ioaddr + UART_MCR);
1787                 spin_unlock_irq(&info->slock);
1788
1789                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1790                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1791                 else
1792                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1793
1794                 if (mcr & MOXA_MUST_MCR_TX_XON)
1795                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1796                 else
1797                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1798
1799                 if (tty->hw_stopped)
1800                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1801                 else
1802                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1803
1804                 if (copy_to_user(argp, &info->mon_data,
1805                                 sizeof(struct mxser_mon)))
1806                         return -EFAULT;
1807
1808                 return 0;
1809         }
1810         case MOXA_ASPP_LSTATUS: {
1811                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1812                         return -EFAULT;
1813
1814                 info->err_shadow = 0;
1815                 return 0;
1816         }
1817         case MOXA_SET_BAUD_METHOD: {
1818                 int method;
1819
1820                 if (get_user(method, (int __user *)argp))
1821                         return -EFAULT;
1822                 mxser_set_baud_method[tty->index] = method;
1823                 return put_user(method, (int __user *)argp);
1824         }
1825         default:
1826                 return -ENOIOCTLCMD;
1827         }
1828         return 0;
1829 }
1830
1831 static void mxser_stoprx(struct tty_struct *tty)
1832 {
1833         struct mxser_port *info = tty->driver_data;
1834
1835         info->ldisc_stop_rx = 1;
1836         if (I_IXOFF(tty)) {
1837                 if (info->board->chip_flag) {
1838                         info->IER &= ~MOXA_MUST_RECV_ISR;
1839                         outb(info->IER, info->ioaddr + UART_IER);
1840                 } else {
1841                         info->x_char = STOP_CHAR(tty);
1842                         outb(0, info->ioaddr + UART_IER);
1843                         info->IER |= UART_IER_THRI;
1844                         outb(info->IER, info->ioaddr + UART_IER);
1845                 }
1846         }
1847
1848         if (tty->termios->c_cflag & CRTSCTS) {
1849                 info->MCR &= ~UART_MCR_RTS;
1850                 outb(info->MCR, info->ioaddr + UART_MCR);
1851         }
1852 }
1853
1854 /*
1855  * This routine is called by the upper-layer tty layer to signal that
1856  * incoming characters should be throttled.
1857  */
1858 static void mxser_throttle(struct tty_struct *tty)
1859 {
1860         mxser_stoprx(tty);
1861 }
1862
1863 static void mxser_unthrottle(struct tty_struct *tty)
1864 {
1865         struct mxser_port *info = tty->driver_data;
1866
1867         /* startrx */
1868         info->ldisc_stop_rx = 0;
1869         if (I_IXOFF(tty)) {
1870                 if (info->x_char)
1871                         info->x_char = 0;
1872                 else {
1873                         if (info->board->chip_flag) {
1874                                 info->IER |= MOXA_MUST_RECV_ISR;
1875                                 outb(info->IER, info->ioaddr + UART_IER);
1876                         } else {
1877                                 info->x_char = START_CHAR(tty);
1878                                 outb(0, info->ioaddr + UART_IER);
1879                                 info->IER |= UART_IER_THRI;
1880                                 outb(info->IER, info->ioaddr + UART_IER);
1881                         }
1882                 }
1883         }
1884
1885         if (tty->termios->c_cflag & CRTSCTS) {
1886                 info->MCR |= UART_MCR_RTS;
1887                 outb(info->MCR, info->ioaddr + UART_MCR);
1888         }
1889 }
1890
1891 /*
1892  * mxser_stop() and mxser_start()
1893  *
1894  * This routines are called before setting or resetting tty->stopped.
1895  * They enable or disable transmitter interrupts, as necessary.
1896  */
1897 static void mxser_stop(struct tty_struct *tty)
1898 {
1899         struct mxser_port *info = tty->driver_data;
1900         unsigned long flags;
1901
1902         spin_lock_irqsave(&info->slock, flags);
1903         if (info->IER & UART_IER_THRI) {
1904                 info->IER &= ~UART_IER_THRI;
1905                 outb(info->IER, info->ioaddr + UART_IER);
1906         }
1907         spin_unlock_irqrestore(&info->slock, flags);
1908 }
1909
1910 static void mxser_start(struct tty_struct *tty)
1911 {
1912         struct mxser_port *info = tty->driver_data;
1913         unsigned long flags;
1914
1915         spin_lock_irqsave(&info->slock, flags);
1916         if (info->xmit_cnt && info->port.xmit_buf) {
1917                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1918                 info->IER |= UART_IER_THRI;
1919                 outb(info->IER, info->ioaddr + UART_IER);
1920         }
1921         spin_unlock_irqrestore(&info->slock, flags);
1922 }
1923
1924 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1925 {
1926         struct mxser_port *info = tty->driver_data;
1927         unsigned long flags;
1928
1929         spin_lock_irqsave(&info->slock, flags);
1930         mxser_change_speed(tty, old_termios);
1931         spin_unlock_irqrestore(&info->slock, flags);
1932
1933         if ((old_termios->c_cflag & CRTSCTS) &&
1934                         !(tty->termios->c_cflag & CRTSCTS)) {
1935                 tty->hw_stopped = 0;
1936                 mxser_start(tty);
1937         }
1938
1939         /* Handle sw stopped */
1940         if ((old_termios->c_iflag & IXON) &&
1941                         !(tty->termios->c_iflag & IXON)) {
1942                 tty->stopped = 0;
1943
1944                 if (info->board->chip_flag) {
1945                         spin_lock_irqsave(&info->slock, flags);
1946                         mxser_disable_must_rx_software_flow_control(
1947                                         info->ioaddr);
1948                         spin_unlock_irqrestore(&info->slock, flags);
1949                 }
1950
1951                 mxser_start(tty);
1952         }
1953 }
1954
1955 /*
1956  * mxser_wait_until_sent() --- wait until the transmitter is empty
1957  */
1958 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1959 {
1960         struct mxser_port *info = tty->driver_data;
1961         unsigned long orig_jiffies, char_time;
1962         unsigned long flags;
1963         int lsr;
1964
1965         if (info->type == PORT_UNKNOWN)
1966                 return;
1967
1968         if (info->xmit_fifo_size == 0)
1969                 return;         /* Just in case.... */
1970
1971         orig_jiffies = jiffies;
1972         /*
1973          * Set the check interval to be 1/5 of the estimated time to
1974          * send a single character, and make it at least 1.  The check
1975          * interval should also be less than the timeout.
1976          *
1977          * Note: we have to use pretty tight timings here to satisfy
1978          * the NIST-PCTS.
1979          */
1980         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1981         char_time = char_time / 5;
1982         if (char_time == 0)
1983                 char_time = 1;
1984         if (timeout && timeout < char_time)
1985                 char_time = timeout;
1986         /*
1987          * If the transmitter hasn't cleared in twice the approximate
1988          * amount of time to send the entire FIFO, it probably won't
1989          * ever clear.  This assumes the UART isn't doing flow
1990          * control, which is currently the case.  Hence, if it ever
1991          * takes longer than info->timeout, this is probably due to a
1992          * UART bug of some kind.  So, we clamp the timeout parameter at
1993          * 2*info->timeout.
1994          */
1995         if (!timeout || timeout > 2 * info->timeout)
1996                 timeout = 2 * info->timeout;
1997 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1998         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
1999                 timeout, char_time);
2000         printk("jiff=%lu...", jiffies);
2001 #endif
2002         spin_lock_irqsave(&info->slock, flags);
2003         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2004 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2005                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2006 #endif
2007                 spin_unlock_irqrestore(&info->slock, flags);
2008                 schedule_timeout_interruptible(char_time);
2009                 spin_lock_irqsave(&info->slock, flags);
2010                 if (signal_pending(current))
2011                         break;
2012                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2013                         break;
2014         }
2015         spin_unlock_irqrestore(&info->slock, flags);
2016         set_current_state(TASK_RUNNING);
2017
2018 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2019         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2020 #endif
2021 }
2022
2023 /*
2024  * This routine is called by tty_hangup() when a hangup is signaled.
2025  */
2026 static void mxser_hangup(struct tty_struct *tty)
2027 {
2028         struct mxser_port *info = tty->driver_data;
2029
2030         mxser_flush_buffer(tty);
2031         tty_port_hangup(&info->port);
2032 }
2033
2034 /*
2035  * mxser_rs_break() --- routine which turns the break handling on or off
2036  */
2037 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2038 {
2039         struct mxser_port *info = tty->driver_data;
2040         unsigned long flags;
2041
2042         spin_lock_irqsave(&info->slock, flags);
2043         if (break_state == -1)
2044                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2045                         info->ioaddr + UART_LCR);
2046         else
2047                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2048                         info->ioaddr + UART_LCR);
2049         spin_unlock_irqrestore(&info->slock, flags);
2050         return 0;
2051 }
2052
2053 static void mxser_receive_chars(struct tty_struct *tty,
2054                                 struct mxser_port *port, int *status)
2055 {
2056         unsigned char ch, gdl;
2057         int ignored = 0;
2058         int cnt = 0;
2059         int recv_room;
2060         int max = 256;
2061
2062         recv_room = tty->receive_room;
2063         if (recv_room == 0 && !port->ldisc_stop_rx)
2064                 mxser_stoprx(tty);
2065         if (port->board->chip_flag != MOXA_OTHER_UART) {
2066
2067                 if (*status & UART_LSR_SPECIAL)
2068                         goto intr_old;
2069                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2070                                 (*status & MOXA_MUST_LSR_RERR))
2071                         goto intr_old;
2072                 if (*status & MOXA_MUST_LSR_RERR)
2073                         goto intr_old;
2074
2075                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2076
2077                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2078                         gdl &= MOXA_MUST_GDL_MASK;
2079                 if (gdl >= recv_room) {
2080                         if (!port->ldisc_stop_rx)
2081                                 mxser_stoprx(tty);
2082                 }
2083                 while (gdl--) {
2084                         ch = inb(port->ioaddr + UART_RX);
2085                         tty_insert_flip_char(tty, ch, 0);
2086                         cnt++;
2087                 }
2088                 goto end_intr;
2089         }
2090 intr_old:
2091
2092         do {
2093                 if (max-- < 0)
2094                         break;
2095
2096                 ch = inb(port->ioaddr + UART_RX);
2097                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2098                         outb(0x23, port->ioaddr + UART_FCR);
2099                 *status &= port->read_status_mask;
2100                 if (*status & port->ignore_status_mask) {
2101                         if (++ignored > 100)
2102                                 break;
2103                 } else {
2104                         char flag = 0;
2105                         if (*status & UART_LSR_SPECIAL) {
2106                                 if (*status & UART_LSR_BI) {
2107                                         flag = TTY_BREAK;
2108                                         port->icount.brk++;
2109
2110                                         if (port->port.flags & ASYNC_SAK)
2111                                                 do_SAK(tty);
2112                                 } else if (*status & UART_LSR_PE) {
2113                                         flag = TTY_PARITY;
2114                                         port->icount.parity++;
2115                                 } else if (*status & UART_LSR_FE) {
2116                                         flag = TTY_FRAME;
2117                                         port->icount.frame++;
2118                                 } else if (*status & UART_LSR_OE) {
2119                                         flag = TTY_OVERRUN;
2120                                         port->icount.overrun++;
2121                                 } else
2122                                         flag = TTY_BREAK;
2123                         }
2124                         tty_insert_flip_char(tty, ch, flag);
2125                         cnt++;
2126                         if (cnt >= recv_room) {
2127                                 if (!port->ldisc_stop_rx)
2128                                         mxser_stoprx(tty);
2129                                 break;
2130                         }
2131
2132                 }
2133
2134                 if (port->board->chip_flag)
2135                         break;
2136
2137                 *status = inb(port->ioaddr + UART_LSR);
2138         } while (*status & UART_LSR_DR);
2139
2140 end_intr:
2141         mxvar_log.rxcnt[tty->index] += cnt;
2142         port->mon_data.rxcnt += cnt;
2143         port->mon_data.up_rxcnt += cnt;
2144
2145         /*
2146          * We are called from an interrupt context with &port->slock
2147          * being held. Drop it temporarily in order to prevent
2148          * recursive locking.
2149          */
2150         spin_unlock(&port->slock);
2151         tty_flip_buffer_push(tty);
2152         spin_lock(&port->slock);
2153 }
2154
2155 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2156 {
2157         int count, cnt;
2158
2159         if (port->x_char) {
2160                 outb(port->x_char, port->ioaddr + UART_TX);
2161                 port->x_char = 0;
2162                 mxvar_log.txcnt[tty->index]++;
2163                 port->mon_data.txcnt++;
2164                 port->mon_data.up_txcnt++;
2165                 port->icount.tx++;
2166                 return;
2167         }
2168
2169         if (port->port.xmit_buf == NULL)
2170                 return;
2171
2172         if (port->xmit_cnt <= 0 || tty->stopped ||
2173                         (tty->hw_stopped &&
2174                         (port->type != PORT_16550A) &&
2175                         (!port->board->chip_flag))) {
2176                 port->IER &= ~UART_IER_THRI;
2177                 outb(port->IER, port->ioaddr + UART_IER);
2178                 return;
2179         }
2180
2181         cnt = port->xmit_cnt;
2182         count = port->xmit_fifo_size;
2183         do {
2184                 outb(port->port.xmit_buf[port->xmit_tail++],
2185                         port->ioaddr + UART_TX);
2186                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2187                 if (--port->xmit_cnt <= 0)
2188                         break;
2189         } while (--count > 0);
2190         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2191
2192         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2193         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2194         port->icount.tx += (cnt - port->xmit_cnt);
2195
2196         if (port->xmit_cnt < WAKEUP_CHARS && tty)
2197                 tty_wakeup(tty);
2198
2199         if (port->xmit_cnt <= 0) {
2200                 port->IER &= ~UART_IER_THRI;
2201                 outb(port->IER, port->ioaddr + UART_IER);
2202         }
2203 }
2204
2205 /*
2206  * This is the serial driver's generic interrupt routine
2207  */
2208 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2209 {
2210         int status, iir, i;
2211         struct mxser_board *brd = NULL;
2212         struct mxser_port *port;
2213         int max, irqbits, bits, msr;
2214         unsigned int int_cnt, pass_counter = 0;
2215         int handled = IRQ_NONE;
2216         struct tty_struct *tty;
2217
2218         for (i = 0; i < MXSER_BOARDS; i++)
2219                 if (dev_id == &mxser_boards[i]) {
2220                         brd = dev_id;
2221                         break;
2222                 }
2223
2224         if (i == MXSER_BOARDS)
2225                 goto irq_stop;
2226         if (brd == NULL)
2227                 goto irq_stop;
2228         max = brd->info->nports;
2229         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2230                 irqbits = inb(brd->vector) & brd->vector_mask;
2231                 if (irqbits == brd->vector_mask)
2232                         break;
2233
2234                 handled = IRQ_HANDLED;
2235                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2236                         if (irqbits == brd->vector_mask)
2237                                 break;
2238                         if (bits & irqbits)
2239                                 continue;
2240                         port = &brd->ports[i];
2241
2242                         int_cnt = 0;
2243                         spin_lock(&port->slock);
2244                         do {
2245                                 iir = inb(port->ioaddr + UART_IIR);
2246                                 if (iir & UART_IIR_NO_INT)
2247                                         break;
2248                                 iir &= MOXA_MUST_IIR_MASK;
2249                                 tty = tty_port_tty_get(&port->port);
2250                                 if (!tty ||
2251                                                 (port->port.flags & ASYNC_CLOSING) ||
2252                                                 !(port->port.flags &
2253                                                         ASYNC_INITIALIZED)) {
2254                                         status = inb(port->ioaddr + UART_LSR);
2255                                         outb(0x27, port->ioaddr + UART_FCR);
2256                                         inb(port->ioaddr + UART_MSR);
2257                                         tty_kref_put(tty);
2258                                         break;
2259                                 }
2260
2261                                 status = inb(port->ioaddr + UART_LSR);
2262
2263                                 if (status & UART_LSR_PE)
2264                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2265                                 if (status & UART_LSR_FE)
2266                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2267                                 if (status & UART_LSR_OE)
2268                                         port->err_shadow |=
2269                                                 NPPI_NOTIFY_HW_OVERRUN;
2270                                 if (status & UART_LSR_BI)
2271                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2272
2273                                 if (port->board->chip_flag) {
2274                                         if (iir == MOXA_MUST_IIR_GDA ||
2275                                             iir == MOXA_MUST_IIR_RDA ||
2276                                             iir == MOXA_MUST_IIR_RTO ||
2277                                             iir == MOXA_MUST_IIR_LSR)
2278                                                 mxser_receive_chars(tty, port,
2279                                                                 &status);
2280
2281                                 } else {
2282                                         status &= port->read_status_mask;
2283                                         if (status & UART_LSR_DR)
2284                                                 mxser_receive_chars(tty, port,
2285                                                                 &status);
2286                                 }
2287                                 msr = inb(port->ioaddr + UART_MSR);
2288                                 if (msr & UART_MSR_ANY_DELTA)
2289                                         mxser_check_modem_status(tty, port, msr);
2290
2291                                 if (port->board->chip_flag) {
2292                                         if (iir == 0x02 && (status &
2293                                                                 UART_LSR_THRE))
2294                                                 mxser_transmit_chars(tty, port);
2295                                 } else {
2296                                         if (status & UART_LSR_THRE)
2297                                                 mxser_transmit_chars(tty, port);
2298                                 }
2299                                 tty_kref_put(tty);
2300                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2301                         spin_unlock(&port->slock);
2302                 }
2303         }
2304
2305 irq_stop:
2306         return handled;
2307 }
2308
2309 static const struct tty_operations mxser_ops = {
2310         .open = mxser_open,
2311         .close = mxser_close,
2312         .write = mxser_write,
2313         .put_char = mxser_put_char,
2314         .flush_chars = mxser_flush_chars,
2315         .write_room = mxser_write_room,
2316         .chars_in_buffer = mxser_chars_in_buffer,
2317         .flush_buffer = mxser_flush_buffer,
2318         .ioctl = mxser_ioctl,
2319         .throttle = mxser_throttle,
2320         .unthrottle = mxser_unthrottle,
2321         .set_termios = mxser_set_termios,
2322         .stop = mxser_stop,
2323         .start = mxser_start,
2324         .hangup = mxser_hangup,
2325         .break_ctl = mxser_rs_break,
2326         .wait_until_sent = mxser_wait_until_sent,
2327         .tiocmget = mxser_tiocmget,
2328         .tiocmset = mxser_tiocmset,
2329 };
2330
2331 struct tty_port_operations mxser_port_ops = {
2332         .carrier_raised = mxser_carrier_raised,
2333         .dtr_rts = mxser_dtr_rts,
2334         .activate = mxser_activate,
2335         .shutdown = mxser_shutdown_port,
2336 };
2337
2338 /*
2339  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2340  */
2341
2342 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2343                 unsigned int irq)
2344 {
2345         if (irq)
2346                 free_irq(brd->irq, brd);
2347         if (pdev != NULL) {     /* PCI */
2348 #ifdef CONFIG_PCI
2349                 pci_release_region(pdev, 2);
2350                 pci_release_region(pdev, 3);
2351 #endif
2352         } else {
2353                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2354                 release_region(brd->vector, 1);
2355         }
2356 }
2357
2358 static int __devinit mxser_initbrd(struct mxser_board *brd,
2359                 struct pci_dev *pdev)
2360 {
2361         struct mxser_port *info;
2362         unsigned int i;
2363         int retval;
2364
2365         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2366                         brd->ports[0].max_baud);
2367
2368         for (i = 0; i < brd->info->nports; i++) {
2369                 info = &brd->ports[i];
2370                 tty_port_init(&info->port);
2371                 info->port.ops = &mxser_port_ops;
2372                 info->board = brd;
2373                 info->stop_rx = 0;
2374                 info->ldisc_stop_rx = 0;
2375
2376                 /* Enhance mode enabled here */
2377                 if (brd->chip_flag != MOXA_OTHER_UART)
2378                         mxser_enable_must_enchance_mode(info->ioaddr);
2379
2380                 info->port.flags = ASYNC_SHARE_IRQ;
2381                 info->type = brd->uart_type;
2382
2383                 process_txrx_fifo(info);
2384
2385                 info->custom_divisor = info->baud_base * 16;
2386                 info->port.close_delay = 5 * HZ / 10;
2387                 info->port.closing_wait = 30 * HZ;
2388                 info->normal_termios = mxvar_sdriver->init_termios;
2389                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2390                 info->err_shadow = 0;
2391                 spin_lock_init(&info->slock);
2392
2393                 /* before set INT ISR, disable all int */
2394                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2395                         info->ioaddr + UART_IER);
2396         }
2397
2398         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2399                         brd);
2400         if (retval) {
2401                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2402                         "conflict with another device.\n",
2403                         brd->info->name, brd->irq);
2404                 /* We hold resources, we need to release them. */
2405                 mxser_release_res(brd, pdev, 0);
2406         }
2407         return retval;
2408 }
2409
2410 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2411 {
2412         int id, i, bits;
2413         unsigned short regs[16], irq;
2414         unsigned char scratch, scratch2;
2415
2416         brd->chip_flag = MOXA_OTHER_UART;
2417
2418         id = mxser_read_register(cap, regs);
2419         switch (id) {
2420         case C168_ASIC_ID:
2421                 brd->info = &mxser_cards[0];
2422                 break;
2423         case C104_ASIC_ID:
2424                 brd->info = &mxser_cards[1];
2425                 break;
2426         case CI104J_ASIC_ID:
2427                 brd->info = &mxser_cards[2];
2428                 break;
2429         case C102_ASIC_ID:
2430                 brd->info = &mxser_cards[5];
2431                 break;
2432         case CI132_ASIC_ID:
2433                 brd->info = &mxser_cards[6];
2434                 break;
2435         case CI134_ASIC_ID:
2436                 brd->info = &mxser_cards[7];
2437                 break;
2438         default:
2439                 return 0;
2440         }
2441
2442         irq = 0;
2443         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2444            Flag-hack checks if configuration should be read as 2-port here. */
2445         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2446                 irq = regs[9] & 0xF000;
2447                 irq = irq | (irq >> 4);
2448                 if (irq != (regs[9] & 0xFF00))
2449                         goto err_irqconflict;
2450         } else if (brd->info->nports == 4) {
2451                 irq = regs[9] & 0xF000;
2452                 irq = irq | (irq >> 4);
2453                 irq = irq | (irq >> 8);
2454                 if (irq != regs[9])
2455                         goto err_irqconflict;
2456         } else if (brd->info->nports == 8) {
2457                 irq = regs[9] & 0xF000;
2458                 irq = irq | (irq >> 4);
2459                 irq = irq | (irq >> 8);
2460                 if ((irq != regs[9]) || (irq != regs[10]))
2461                         goto err_irqconflict;
2462         }
2463
2464         if (!irq) {
2465                 printk(KERN_ERR "mxser: interrupt number unset\n");
2466                 return -EIO;
2467         }
2468         brd->irq = ((int)(irq & 0xF000) >> 12);
2469         for (i = 0; i < 8; i++)
2470                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2471         if ((regs[12] & 0x80) == 0) {
2472                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2473                 return -EIO;
2474         }
2475         brd->vector = (int)regs[11];    /* interrupt vector */
2476         if (id == 1)
2477                 brd->vector_mask = 0x00FF;
2478         else
2479                 brd->vector_mask = 0x000F;
2480         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2481                 if (regs[12] & bits) {
2482                         brd->ports[i].baud_base = 921600;
2483                         brd->ports[i].max_baud = 921600;
2484                 } else {
2485                         brd->ports[i].baud_base = 115200;
2486                         brd->ports[i].max_baud = 115200;
2487                 }
2488         }
2489         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2490         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2491         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2492         outb(scratch2, cap + UART_LCR);
2493         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2494         scratch = inb(cap + UART_IIR);
2495
2496         if (scratch & 0xC0)
2497                 brd->uart_type = PORT_16550A;
2498         else
2499                 brd->uart_type = PORT_16450;
2500         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2501                         "mxser(IO)")) {
2502                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2503                                 "0x%.8lx-0x%.8lx\n",
2504                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2505                                 8 * brd->info->nports - 1);
2506                 return -EIO;
2507         }
2508         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2509                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2510                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2511                                 "0x%.8lx-0x%.8lx\n",
2512                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2513                                 8 * brd->info->nports - 1);
2514                 return -EIO;
2515         }
2516         return brd->info->nports;
2517
2518 err_irqconflict:
2519         printk(KERN_ERR "mxser: invalid interrupt number\n");
2520         return -EIO;
2521 }
2522
2523 static int __devinit mxser_probe(struct pci_dev *pdev,
2524                 const struct pci_device_id *ent)
2525 {
2526 #ifdef CONFIG_PCI
2527         struct mxser_board *brd;
2528         unsigned int i, j;
2529         unsigned long ioaddress;
2530         int retval = -EINVAL;
2531
2532         for (i = 0; i < MXSER_BOARDS; i++)
2533                 if (mxser_boards[i].info == NULL)
2534                         break;
2535
2536         if (i >= MXSER_BOARDS) {
2537                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2538                                 "not configured\n", MXSER_BOARDS);
2539                 goto err;
2540         }
2541
2542         brd = &mxser_boards[i];
2543         brd->idx = i * MXSER_PORTS_PER_BOARD;
2544         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2545                 mxser_cards[ent->driver_data].name,
2546                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2547
2548         retval = pci_enable_device(pdev);
2549         if (retval) {
2550                 dev_err(&pdev->dev, "PCI enable failed\n");
2551                 goto err;
2552         }
2553
2554         /* io address */
2555         ioaddress = pci_resource_start(pdev, 2);
2556         retval = pci_request_region(pdev, 2, "mxser(IO)");
2557         if (retval)
2558                 goto err;
2559
2560         brd->info = &mxser_cards[ent->driver_data];
2561         for (i = 0; i < brd->info->nports; i++)
2562                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2563
2564         /* vector */
2565         ioaddress = pci_resource_start(pdev, 3);
2566         retval = pci_request_region(pdev, 3, "mxser(vector)");
2567         if (retval)
2568                 goto err_relio;
2569         brd->vector = ioaddress;
2570
2571         /* irq */
2572         brd->irq = pdev->irq;
2573
2574         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2575         brd->uart_type = PORT_16550A;
2576         brd->vector_mask = 0;
2577
2578         for (i = 0; i < brd->info->nports; i++) {
2579                 for (j = 0; j < UART_INFO_NUM; j++) {
2580                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2581                                 brd->ports[i].max_baud =
2582                                         Gpci_uart_info[j].max_baud;
2583
2584                                 /* exception....CP-102 */
2585                                 if (brd->info->flags & MXSER_HIGHBAUD)
2586                                         brd->ports[i].max_baud = 921600;
2587                                 break;
2588                         }
2589                 }
2590         }
2591
2592         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2593                 for (i = 0; i < brd->info->nports; i++) {
2594                         if (i < 4)
2595                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2596                         else
2597                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2598                 }
2599                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2600                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2601         }
2602
2603         for (i = 0; i < brd->info->nports; i++) {
2604                 brd->vector_mask |= (1 << i);
2605                 brd->ports[i].baud_base = 921600;
2606         }
2607
2608         /* mxser_initbrd will hook ISR. */
2609         retval = mxser_initbrd(brd, pdev);
2610         if (retval)
2611                 goto err_null;
2612
2613         for (i = 0; i < brd->info->nports; i++)
2614                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2615
2616         pci_set_drvdata(pdev, brd);
2617
2618         return 0;
2619 err_relio:
2620         pci_release_region(pdev, 2);
2621 err_null:
2622         brd->info = NULL;
2623 err:
2624         return retval;
2625 #else
2626         return -ENODEV;
2627 #endif
2628 }
2629
2630 static void __devexit mxser_remove(struct pci_dev *pdev)
2631 {
2632         struct mxser_board *brd = pci_get_drvdata(pdev);
2633         unsigned int i;
2634
2635         for (i = 0; i < brd->info->nports; i++)
2636                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2637
2638         mxser_release_res(brd, pdev, 1);
2639         brd->info = NULL;
2640 }
2641
2642 static struct pci_driver mxser_driver = {
2643         .name = "mxser",
2644         .id_table = mxser_pcibrds,
2645         .probe = mxser_probe,
2646         .remove = __devexit_p(mxser_remove)
2647 };
2648
2649 static int __init mxser_module_init(void)
2650 {
2651         struct mxser_board *brd;
2652         unsigned int b, i, m;
2653         int retval;
2654
2655         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2656         if (!mxvar_sdriver)
2657                 return -ENOMEM;
2658
2659         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2660                 MXSER_VERSION);
2661
2662         /* Initialize the tty_driver structure */
2663         mxvar_sdriver->owner = THIS_MODULE;
2664         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2665         mxvar_sdriver->name = "ttyMI";
2666         mxvar_sdriver->major = ttymajor;
2667         mxvar_sdriver->minor_start = 0;
2668         mxvar_sdriver->num = MXSER_PORTS + 1;
2669         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2670         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2671         mxvar_sdriver->init_termios = tty_std_termios;
2672         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2673         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2674         tty_set_operations(mxvar_sdriver, &mxser_ops);
2675
2676         retval = tty_register_driver(mxvar_sdriver);
2677         if (retval) {
2678                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2679                                 "tty driver !\n");
2680                 goto err_put;
2681         }
2682
2683         /* Start finding ISA boards here */
2684         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2685                 if (!ioaddr[b])
2686                         continue;
2687
2688                 brd = &mxser_boards[m];
2689                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2690                 if (retval <= 0) {
2691                         brd->info = NULL;
2692                         continue;
2693                 }
2694
2695                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2696                                 brd->info->name, ioaddr[b]);
2697
2698                 /* mxser_initbrd will hook ISR. */
2699                 if (mxser_initbrd(brd, NULL) < 0) {
2700                         brd->info = NULL;
2701                         continue;
2702                 }
2703
2704                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2705                 for (i = 0; i < brd->info->nports; i++)
2706                         tty_register_device(mxvar_sdriver, brd->idx + i, NULL);
2707
2708                 m++;
2709         }
2710
2711         retval = pci_register_driver(&mxser_driver);
2712         if (retval) {
2713                 printk(KERN_ERR "mxser: can't register pci driver\n");
2714                 if (!m) {
2715                         retval = -ENODEV;
2716                         goto err_unr;
2717                 } /* else: we have some ISA cards under control */
2718         }
2719
2720         return 0;
2721 err_unr:
2722         tty_unregister_driver(mxvar_sdriver);
2723 err_put:
2724         put_tty_driver(mxvar_sdriver);
2725         return retval;
2726 }
2727
2728 static void __exit mxser_module_exit(void)
2729 {
2730         unsigned int i, j;
2731
2732         pci_unregister_driver(&mxser_driver);
2733
2734         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2735                 if (mxser_boards[i].info != NULL)
2736                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2737                                 tty_unregister_device(mxvar_sdriver,
2738                                                 mxser_boards[i].idx + j);
2739         tty_unregister_driver(mxvar_sdriver);
2740         put_tty_driver(mxvar_sdriver);
2741
2742         for (i = 0; i < MXSER_BOARDS; i++)
2743                 if (mxser_boards[i].info != NULL)
2744                         mxser_release_res(&mxser_boards[i], NULL, 1);
2745 }
2746
2747 module_init(mxser_module_init);
2748 module_exit(mxser_module_exit);