drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
  18  *      - Fixed x86_64 cleanness
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/errno.h>
  23 #include <linux/signal.h>
  24 #include <linux/sched.h>
  25 #include <linux/timer.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/tty.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/serial.h>
  30 #include <linux/serial_reg.h>
  31 #include <linux/major.h>
  32 #include <linux/string.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/ptrace.h>
  35 #include <linux/gfp.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
  42 #include <asm/system.h>
  43 #include <asm/io.h>
  44 #include <asm/irq.h>
  45 #include <asm/uaccess.h>
  46
  47 #include "mxser.h"
  48
  49 #define MXSER_VERSION   "2.0.4"         /* 1.12 */
  50 #define MXSERMAJOR       174
  51
  52 #define MXSER_BOARDS            4       /* Max. boards */
  53 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  54 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  55 #define MXSER_ISR_PASS_LIMIT    100
  56
  57 /*CheckIsMoxaMust return value*/
  58 #define MOXA_OTHER_UART         0x00
  59 #define MOXA_MUST_MU150_HWID    0x01
  60 #define MOXA_MUST_MU860_HWID    0x02
  61
  62 #define WAKEUP_CHARS            256
  63
  64 #define UART_MCR_AFE            0x20
  65 #define UART_LSR_SPECIAL        0x1E
  66
  67 #define PCI_DEVICE_ID_POS104UL  0x1044
  68 #define PCI_DEVICE_ID_CB108     0x1080
  69 #define PCI_DEVICE_ID_CP102UF   0x1023
  70 #define PCI_DEVICE_ID_CB114     0x1142
  71 #define PCI_DEVICE_ID_CP114UL   0x1143
  72 #define PCI_DEVICE_ID_CB134I    0x1341
  73 #define PCI_DEVICE_ID_CP138U    0x1380
  74
  75
  76 #define C168_ASIC_ID    1
  77 #define C104_ASIC_ID    2
  78 #define C102_ASIC_ID    0xB
  79 #define CI132_ASIC_ID   4
  80 #define CI134_ASIC_ID   3
  81 #define CI104J_ASIC_ID  5
  82
  83 #define MXSER_HIGHBAUD  1
  84 #define MXSER_HAS2      2
  85
  86 /* This is only for PCI */
  87 static const struct {
  88         int type;
  89         int tx_fifo;
  90         int rx_fifo;
  91         int xmit_fifo_size;
  92         int rx_high_water;
  93         int rx_trigger;
  94         int rx_low_water;
  95         long max_baud;
  96 } Gpci_uart_info[] = {
  97         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
  98         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
  99         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 100 };
 101 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 102
 103 struct mxser_cardinfo {
 104         char *name;
 105         unsigned int nports;
 106         unsigned int flags;
 107 };
 108
 109 static const struct mxser_cardinfo mxser_cards[] = {
 110 /* 0*/  { "C168 series",        8, },
 111         { "C104 series",        4, },
 112         { "CI-104J series",     4, },
 113         { "C168H/PCI series",   8, },
 114         { "C104H/PCI series",   4, },
 115 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 116         { "CI-132 series",      4, MXSER_HAS2 },
 117         { "CI-134 series",      4, },
 118         { "CP-132 series",      2, },
 119         { "CP-114 series",      4, },
 120 /*10*/  { "CT-114 series",      4, },
 121         { "CP-102 series",      2, MXSER_HIGHBAUD },
 122         { "CP-104U series",     4, },
 123         { "CP-168U series",     8, },
 124         { "CP-132U series",     2, },
 125 /*15*/  { "CP-134U series",     4, },
 126         { "CP-104JU series",    4, },
 127         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 128         { "CP-118U series",     8, },
 129         { "CP-102UL series",    2, },
 130 /*20*/  { "CP-102U series",     2, },
 131         { "CP-118EL series",    8, },
 132         { "CP-168EL series",    8, },
 133         { "CP-104EL series",    4, },
 134         { "CB-108 series",      8, },
 135 /*25*/  { "CB-114 series",      4, },
 136         { "CB-134I series",     4, },
 137         { "CP-138U series",     8, },
 138         { "POS-104UL series",   4, },
 139         { "CP-114UL series",    4, },
 140 /*30*/  { "CP-102UF series",    2, }
 141 };
 142
 143 /* driver_data correspond to the lines in the structure above
 144    see also ISA probe function before you change something */
 145 static struct pci_device_id mxser_pcibrds[] = {
 146         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 147         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 148         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 171         { }
 172 };
 173 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 174
 175 static unsigned long ioaddr[MXSER_BOARDS];
 176 static int ttymajor = MXSERMAJOR;
 177
 178 /* Variables for insmod */
 179
 180 MODULE_AUTHOR("Casper Yang");
 181 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 182 module_param_array(ioaddr, ulong, NULL, 0);
 183 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 184 module_param(ttymajor, int, 0);
 185 MODULE_LICENSE("GPL");
 186
 187 struct mxser_log {
 188         int tick;
 189         unsigned long rxcnt[MXSER_PORTS];
 190         unsigned long txcnt[MXSER_PORTS];
 191 };
 192
 193 struct mxser_mon {
 194         unsigned long rxcnt;
 195         unsigned long txcnt;
 196         unsigned long up_rxcnt;
 197         unsigned long up_txcnt;
 198         int modem_status;
 199         unsigned char hold_reason;
 200 };
 201
 202 struct mxser_mon_ext {
 203         unsigned long rx_cnt[32];
 204         unsigned long tx_cnt[32];
 205         unsigned long up_rxcnt[32];
 206         unsigned long up_txcnt[32];
 207         int modem_status[32];
 208
 209         long baudrate[32];
 210         int databits[32];
 211         int stopbits[32];
 212         int parity[32];
 213         int flowctrl[32];
 214         int fifo[32];
 215         int iftype[32];
 216 };
 217
 218 struct mxser_board;
 219
 220 struct mxser_port {
 221         struct tty_port port;
 222         struct mxser_board *board;
 223
 224         unsigned long ioaddr;
 225         unsigned long opmode_ioaddr;
 226         int max_baud;
 227
 228         int rx_high_water;
 229         int rx_trigger;         /* Rx fifo trigger level */
 230         int rx_low_water;
 231         int baud_base;          /* max. speed */
 232         int type;               /* UART type */
 233
 234         int x_char;             /* xon/xoff character */
 235         int IER;                /* Interrupt Enable Register */
 236         int MCR;                /* Modem control register */
 237
 238         unsigned char stop_rx;
 239         unsigned char ldisc_stop_rx;
 240
 241         int custom_divisor;
 242         unsigned char err_shadow;
 243
 244         struct async_icount icount; /* kernel counters for 4 input interrupts */
 245         int timeout;
 246
 247         int read_status_mask;
 248         int ignore_status_mask;
 249         int xmit_fifo_size;
 250         int xmit_head;
 251         int xmit_tail;
 252         int xmit_cnt;
 253
 254         struct ktermios normal_termios;
 255
 256         struct mxser_mon mon_data;
 257
 258         spinlock_t slock;
 259         wait_queue_head_t delta_msr_wait;
 260 };
 261
 262 struct mxser_board {
 263         unsigned int idx;
 264         int irq;
 265         const struct mxser_cardinfo *info;
 266         unsigned long vector;
 267         unsigned long vector_mask;
 268
 269         int chip_flag;
 270         int uart_type;
 271
 272         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 273 };
 274
 275 struct mxser_mstatus {
 276         tcflag_t cflag;
 277         int cts;
 278         int dsr;
 279         int ri;
 280         int dcd;
 281 };
 282
 283 static struct mxser_board mxser_boards[MXSER_BOARDS];
 284 static struct tty_driver *mxvar_sdriver;
 285 static struct mxser_log mxvar_log;
 286 static int mxser_set_baud_method[MXSER_PORTS + 1];
 287
 288 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 289 {
 290         u8 oldlcr;
 291         u8 efr;
 292
 293         oldlcr = inb(baseio + UART_LCR);
 294         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 295
 296         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 297         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 298
 299         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 300         outb(oldlcr, baseio + UART_LCR);
 301 }
 302
 303 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 304 {
 305         u8 oldlcr;
 306         u8 efr;
 307
 308         oldlcr = inb(baseio + UART_LCR);
 309         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 310
 311         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 312         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 313
 314         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 315         outb(oldlcr, baseio + UART_LCR);
 316 }
 317
 318 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 319 {
 320         u8 oldlcr;
 321         u8 efr;
 322
 323         oldlcr = inb(baseio + UART_LCR);
 324         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 325
 326         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 327         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 328         efr |= MOXA_MUST_EFR_BANK0;
 329
 330         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 331         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 332         outb(oldlcr, baseio + UART_LCR);
 333 }
 334
 335 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 336 {
 337         u8 oldlcr;
 338         u8 efr;
 339
 340         oldlcr = inb(baseio + UART_LCR);
 341         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 342
 343         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 344         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 345         efr |= MOXA_MUST_EFR_BANK0;
 346
 347         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 348         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 349         outb(oldlcr, baseio + UART_LCR);
 350 }
 351
 352 static void mxser_set_must_fifo_value(struct mxser_port *info)
 353 {
 354         u8 oldlcr;
 355         u8 efr;
 356
 357         oldlcr = inb(info->ioaddr + UART_LCR);
 358         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 359
 360         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 361         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 362         efr |= MOXA_MUST_EFR_BANK1;
 363
 364         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 365         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 366         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 367         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 368         outb(oldlcr, info->ioaddr + UART_LCR);
 369 }
 370
 371 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 372 {
 373         u8 oldlcr;
 374         u8 efr;
 375
 376         oldlcr = inb(baseio + UART_LCR);
 377         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 378
 379         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 380         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 381         efr |= MOXA_MUST_EFR_BANK2;
 382
 383         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 384         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 385         outb(oldlcr, baseio + UART_LCR);
 386 }
 387
 388 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 389 {
 390         u8 oldlcr;
 391         u8 efr;
 392
 393         oldlcr = inb(baseio + UART_LCR);
 394         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 395
 396         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 397         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 398         efr |= MOXA_MUST_EFR_BANK2;
 399
 400         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 401         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 402         outb(oldlcr, baseio + UART_LCR);
 403 }
 404
 405 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 406 {
 407         u8 oldlcr;
 408         u8 efr;
 409
 410         oldlcr = inb(baseio + UART_LCR);
 411         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 412
 413         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 414         efr &= ~MOXA_MUST_EFR_SF_MASK;
 415
 416         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 417         outb(oldlcr, baseio + UART_LCR);
 418 }
 419
 420 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 421 {
 422         u8 oldlcr;
 423         u8 efr;
 424
 425         oldlcr = inb(baseio + UART_LCR);
 426         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 427
 428         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 429         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 430         efr |= MOXA_MUST_EFR_SF_TX1;
 431
 432         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 433         outb(oldlcr, baseio + UART_LCR);
 434 }
 435
 436 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 437 {
 438         u8 oldlcr;
 439         u8 efr;
 440
 441         oldlcr = inb(baseio + UART_LCR);
 442         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 443
 444         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 445         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 446
 447         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 448         outb(oldlcr, baseio + UART_LCR);
 449 }
 450
 451 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 452 {
 453         u8 oldlcr;
 454         u8 efr;
 455
 456         oldlcr = inb(baseio + UART_LCR);
 457         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 458
 459         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 460         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 461         efr |= MOXA_MUST_EFR_SF_RX1;
 462
 463         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 464         outb(oldlcr, baseio + UART_LCR);
 465 }
 466
 467 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 468 {
 469         u8 oldlcr;
 470         u8 efr;
 471
 472         oldlcr = inb(baseio + UART_LCR);
 473         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 474
 475         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 476         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 477
 478         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 479         outb(oldlcr, baseio + UART_LCR);
 480 }
 481
 482 #ifdef CONFIG_PCI
 483 static int __devinit CheckIsMoxaMust(unsigned long io)
 484 {
 485         u8 oldmcr, hwid;
 486         int i;
 487
 488         outb(0, io + UART_LCR);
 489         mxser_disable_must_enchance_mode(io);
 490         oldmcr = inb(io + UART_MCR);
 491         outb(0, io + UART_MCR);
 492         mxser_set_must_xon1_value(io, 0x11);
 493         if ((hwid = inb(io + UART_MCR)) != 0) {
 494                 outb(oldmcr, io + UART_MCR);
 495                 return MOXA_OTHER_UART;
 496         }
 497
 498         mxser_get_must_hardware_id(io, &hwid);
 499         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 500                 if (hwid == Gpci_uart_info[i].type)
 501                         return (int)hwid;
 502         }
 503         return MOXA_OTHER_UART;
 504 }
 505 #endif
 506
 507 static void process_txrx_fifo(struct mxser_port *info)
 508 {
 509         int i;
 510
 511         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 512                 info->rx_trigger = 1;
 513                 info->rx_high_water = 1;
 514                 info->rx_low_water = 1;
 515                 info->xmit_fifo_size = 1;
 516         } else
 517                 for (i = 0; i < UART_INFO_NUM; i++)
 518                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 519                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 520                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 521                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 522                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 523                                 break;
 524                         }
 525 }
 526
 527 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 528 {
 529         static unsigned char mxser_msr[MXSER_PORTS + 1];
 530         unsigned char status = 0;
 531
 532         status = inb(baseaddr + UART_MSR);
 533
 534         mxser_msr[port] &= 0x0F;
 535         mxser_msr[port] |= status;
 536         status = mxser_msr[port];
 537         if (mode)
 538                 mxser_msr[port] = 0;
 539
 540         return status;
 541 }
 542
 543 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 544                 struct mxser_port *port)
 545 {
 546         DECLARE_WAITQUEUE(wait, current);
 547         int retval;
 548         int do_clocal = 0;
 549         unsigned long flags;
 550
 551         /*
 552          * If non-blocking mode is set, or the port is not enabled,
 553          * then make the check up front and then exit.
 554          */
 555         if ((filp->f_flags & O_NONBLOCK) ||
 556                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 557                 port->port.flags |= ASYNC_NORMAL_ACTIVE;
 558                 return 0;
 559         }
 560
 561         if (tty->termios->c_cflag & CLOCAL)
 562                 do_clocal = 1;
 563
 564         /*
 565          * Block waiting for the carrier detect and the line to become
 566          * free (i.e., not in use by the callout).  While we are in
 567          * this loop, port->port.count is dropped by one, so that
 568          * mxser_close() knows when to free things.  We restore it upon
 569          * exit, either normal or abnormal.
 570          */
 571         retval = 0;
 572         add_wait_queue(&port->port.open_wait, &wait);
 573
 574         spin_lock_irqsave(&port->slock, flags);
 575         if (!tty_hung_up_p(filp))
 576                 port->port.count--;
 577         spin_unlock_irqrestore(&port->slock, flags);
 578         port->port.blocked_open++;
 579         while (1) {
 580                 spin_lock_irqsave(&port->slock, flags);
 581                 outb(inb(port->ioaddr + UART_MCR) |
 582                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 583                 spin_unlock_irqrestore(&port->slock, flags);
 584                 set_current_state(TASK_INTERRUPTIBLE);
 585                 if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
 586                         if (port->port.flags & ASYNC_HUP_NOTIFY)
 587                                 retval = -EAGAIN;
 588                         else
 589                                 retval = -ERESTARTSYS;
 590                         break;
 591                 }
 592                 if (!(port->port.flags & ASYNC_CLOSING) &&
 593                                 (do_clocal ||
 594                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 595                         break;
 596                 if (signal_pending(current)) {
 597                         retval = -ERESTARTSYS;
 598                         break;
 599                 }
 600                 schedule();
 601         }
 602         set_current_state(TASK_RUNNING);
 603         remove_wait_queue(&port->port.open_wait, &wait);
 604         if (!tty_hung_up_p(filp))
 605                 port->port.count++;
 606         port->port.blocked_open--;
 607         if (retval)
 608                 return retval;
 609         port->port.flags |= ASYNC_NORMAL_ACTIVE;
 610         return 0;
 611 }
 612
 613 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 614 {
 615         struct mxser_port *info = tty->driver_data;
 616         int quot = 0, baud;
 617         unsigned char cval;
 618
 619         if (!info->ioaddr)
 620                 return -1;
 621
 622         if (newspd > info->max_baud)
 623                 return -1;
 624
 625         if (newspd == 134) {
 626                 quot = 2 * info->baud_base / 269;
 627                 tty_encode_baud_rate(tty, 134, 134);
 628         } else if (newspd) {
 629                 quot = info->baud_base / newspd;
 630                 if (quot == 0)
 631                         quot = 1;
 632                 baud = info->baud_base/quot;
 633                 tty_encode_baud_rate(tty, baud, baud);
 634         } else {
 635                 quot = 0;
 636         }
 637
 638         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 639         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 640
 641         if (quot) {
 642                 info->MCR |= UART_MCR_DTR;
 643                 outb(info->MCR, info->ioaddr + UART_MCR);
 644         } else {
 645                 info->MCR &= ~UART_MCR_DTR;
 646                 outb(info->MCR, info->ioaddr + UART_MCR);
 647                 return 0;
 648         }
 649
 650         cval = inb(info->ioaddr + UART_LCR);
 651
 652         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 653
 654         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 655         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 656         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 657
 658 #ifdef BOTHER
 659         if (C_BAUD(tty) == BOTHER) {
 660                 quot = info->baud_base % newspd;
 661                 quot *= 8;
 662                 if (quot % newspd > newspd / 2) {
 663                         quot /= newspd;
 664                         quot++;
 665                 } else
 666                         quot /= newspd;
 667
 668                 mxser_set_must_enum_value(info->ioaddr, quot);
 669         } else
 670 #endif
 671                 mxser_set_must_enum_value(info->ioaddr, 0);
 672
 673         return 0;
 674 }
 675
 676 /*
 677  * This routine is called to set the UART divisor registers to match
 678  * the specified baud rate for a serial port.
 679  */
 680 static int mxser_change_speed(struct tty_struct *tty,
 681                                         struct ktermios *old_termios)
 682 {
 683         struct mxser_port *info = tty->driver_data;
 684         unsigned cflag, cval, fcr;
 685         int ret = 0;
 686         unsigned char status;
 687
 688         cflag = tty->termios->c_cflag;
 689         if (!info->ioaddr)
 690                 return ret;
 691
 692         if (mxser_set_baud_method[tty->index] == 0)
 693                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 694
 695         /* byte size and parity */
 696         switch (cflag & CSIZE) {
 697         case CS5:
 698                 cval = 0x00;
 699                 break;
 700         case CS6:
 701                 cval = 0x01;
 702                 break;
 703         case CS7:
 704                 cval = 0x02;
 705                 break;
 706         case CS8:
 707                 cval = 0x03;
 708                 break;
 709         default:
 710                 cval = 0x00;
 711                 break;          /* too keep GCC shut... */
 712         }
 713         if (cflag & CSTOPB)
 714                 cval |= 0x04;
 715         if (cflag & PARENB)
 716                 cval |= UART_LCR_PARITY;
 717         if (!(cflag & PARODD))
 718                 cval |= UART_LCR_EPAR;
 719         if (cflag & CMSPAR)
 720                 cval |= UART_LCR_SPAR;
 721
 722         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 723                 if (info->board->chip_flag) {
 724                         fcr = UART_FCR_ENABLE_FIFO;
 725                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 726                         mxser_set_must_fifo_value(info);
 727                 } else
 728                         fcr = 0;
 729         } else {
 730                 fcr = UART_FCR_ENABLE_FIFO;
 731                 if (info->board->chip_flag) {
 732                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 733                         mxser_set_must_fifo_value(info);
 734                 } else {
 735                         switch (info->rx_trigger) {
 736                         case 1:
 737                                 fcr |= UART_FCR_TRIGGER_1;
 738                                 break;
 739                         case 4:
 740                                 fcr |= UART_FCR_TRIGGER_4;
 741                                 break;
 742                         case 8:
 743                                 fcr |= UART_FCR_TRIGGER_8;
 744                                 break;
 745                         default:
 746                                 fcr |= UART_FCR_TRIGGER_14;
 747                                 break;
 748                         }
 749                 }
 750         }
 751
 752         /* CTS flow control flag and modem status interrupts */
 753         info->IER &= ~UART_IER_MSI;
 754         info->MCR &= ~UART_MCR_AFE;
 755         if (cflag & CRTSCTS) {
 756                 info->port.flags |= ASYNC_CTS_FLOW;
 757                 info->IER |= UART_IER_MSI;
 758                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 759                         info->MCR |= UART_MCR_AFE;
 760                 } else {
 761                         status = inb(info->ioaddr + UART_MSR);
 762                         if (tty->hw_stopped) {
 763                                 if (status & UART_MSR_CTS) {
 764                                         tty->hw_stopped = 0;
 765                                         if (info->type != PORT_16550A &&
 766                                                         !info->board->chip_flag) {
 767                                                 outb(info->IER & ~UART_IER_THRI,
 768                                                         info->ioaddr +
 769                                                         UART_IER);
 770                                                 info->IER |= UART_IER_THRI;
 771                                                 outb(info->IER, info->ioaddr +
 772                                                                 UART_IER);
 773                                         }
 774                                         tty_wakeup(tty);
 775                                 }
 776                         } else {
 777                                 if (!(status & UART_MSR_CTS)) {
 778                                         tty->hw_stopped = 1;
 779                                         if ((info->type != PORT_16550A) &&
 780                                                         (!info->board->chip_flag)) {
 781                                                 info->IER &= ~UART_IER_THRI;
 782                                                 outb(info->IER, info->ioaddr +
 783                                                                 UART_IER);
 784                                         }
 785                                 }
 786                         }
 787                 }
 788         } else {
 789                 info->port.flags &= ~ASYNC_CTS_FLOW;
 790         }
 791         outb(info->MCR, info->ioaddr + UART_MCR);
 792         if (cflag & CLOCAL) {
 793                 info->port.flags &= ~ASYNC_CHECK_CD;
 794         } else {
 795                 info->port.flags |= ASYNC_CHECK_CD;
 796                 info->IER |= UART_IER_MSI;
 797         }
 798         outb(info->IER, info->ioaddr + UART_IER);
 799
 800         /*
 801          * Set up parity check flag
 802          */
 803         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 804         if (I_INPCK(tty))
 805                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 806         if (I_BRKINT(tty) || I_PARMRK(tty))
 807                 info->read_status_mask |= UART_LSR_BI;
 808
 809         info->ignore_status_mask = 0;
 810
 811         if (I_IGNBRK(tty)) {
 812                 info->ignore_status_mask |= UART_LSR_BI;
 813                 info->read_status_mask |= UART_LSR_BI;
 814                 /*
 815                  * If we're ignore parity and break indicators, ignore
 816                  * overruns too.  (For real raw support).
 817                  */
 818                 if (I_IGNPAR(tty)) {
 819                         info->ignore_status_mask |=
 820                                                 UART_LSR_OE |
 821                                                 UART_LSR_PE |
 822                                                 UART_LSR_FE;
 823                         info->read_status_mask |=
 824                                                 UART_LSR_OE |
 825                                                 UART_LSR_PE |
 826                                                 UART_LSR_FE;
 827                 }
 828         }
 829         if (info->board->chip_flag) {
 830                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 831                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 832                 if (I_IXON(tty)) {
 833                         mxser_enable_must_rx_software_flow_control(
 834                                         info->ioaddr);
 835                 } else {
 836                         mxser_disable_must_rx_software_flow_control(
 837                                         info->ioaddr);
 838                 }
 839                 if (I_IXOFF(tty)) {
 840                         mxser_enable_must_tx_software_flow_control(
 841                                         info->ioaddr);
 842                 } else {
 843                         mxser_disable_must_tx_software_flow_control(
 844                                         info->ioaddr);
 845                 }
 846         }
 847
 848
 849         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 850         outb(cval, info->ioaddr + UART_LCR);
 851
 852         return ret;
 853 }
 854
 855 static void mxser_check_modem_status(struct tty_struct *tty,
 856                                 struct mxser_port *port, int status)
 857 {
 858         /* update input line counters */
 859         if (status & UART_MSR_TERI)
 860                 port->icount.rng++;
 861         if (status & UART_MSR_DDSR)
 862                 port->icount.dsr++;
 863         if (status & UART_MSR_DDCD)
 864                 port->icount.dcd++;
 865         if (status & UART_MSR_DCTS)
 866                 port->icount.cts++;
 867         port->mon_data.modem_status = status;
 868         wake_up_interruptible(&port->delta_msr_wait);
 869
 870         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 871                 if (status & UART_MSR_DCD)
 872                         wake_up_interruptible(&port->port.open_wait);
 873         }
 874
 875         tty = tty_port_tty_get(&port->port);
 876         if (port->port.flags & ASYNC_CTS_FLOW) {
 877                 if (tty->hw_stopped) {
 878                         if (status & UART_MSR_CTS) {
 879                                 tty->hw_stopped = 0;
 880
 881                                 if ((port->type != PORT_16550A) &&
 882                                                 (!port->board->chip_flag)) {
 883                                         outb(port->IER & ~UART_IER_THRI,
 884                                                 port->ioaddr + UART_IER);
 885                                         port->IER |= UART_IER_THRI;
 886                                         outb(port->IER, port->ioaddr +
 887                                                         UART_IER);
 888                                 }
 889                                 tty_wakeup(tty);
 890                         }
 891                 } else {
 892                         if (!(status & UART_MSR_CTS)) {
 893                                 tty->hw_stopped = 1;
 894                                 if (port->type != PORT_16550A &&
 895                                                 !port->board->chip_flag) {
 896                                         port->IER &= ~UART_IER_THRI;
 897                                         outb(port->IER, port->ioaddr +
 898                                                         UART_IER);
 899                                 }
 900                         }
 901                 }
 902         }
 903 }
 904
 905 static int mxser_startup(struct tty_struct *tty)
 906 {
 907         struct mxser_port *info = tty->driver_data;
 908         unsigned long page;
 909         unsigned long flags;
 910
 911         page = __get_free_page(GFP_KERNEL);
 912         if (!page)
 913                 return -ENOMEM;
 914
 915         spin_lock_irqsave(&info->slock, flags);
 916
 917         if (info->port.flags & ASYNC_INITIALIZED) {
 918                 free_page(page);
 919                 spin_unlock_irqrestore(&info->slock, flags);
 920                 return 0;
 921         }
 922
 923         if (!info->ioaddr || !info->type) {
 924                 set_bit(TTY_IO_ERROR, &tty->flags);
 925                 free_page(page);
 926                 spin_unlock_irqrestore(&info->slock, flags);
 927                 return 0;
 928         }
 929         if (info->port.xmit_buf)
 930                 free_page(page);
 931         else
 932                 info->port.xmit_buf = (unsigned char *) page;
 933
 934         /*
 935          * Clear the FIFO buffers and disable them
 936          * (they will be reenabled in mxser_change_speed())
 937          */
 938         if (info->board->chip_flag)
 939                 outb((UART_FCR_CLEAR_RCVR |
 940                         UART_FCR_CLEAR_XMIT |
 941                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 942         else
 943                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 944                         info->ioaddr + UART_FCR);
 945
 946         /*
 947          * At this point there's no way the LSR could still be 0xFF;
 948          * if it is, then bail out, because there's likely no UART
 949          * here.
 950          */
 951         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 952                 spin_unlock_irqrestore(&info->slock, flags);
 953                 if (capable(CAP_SYS_ADMIN)) {
 954                         if (tty)
 955                                 set_bit(TTY_IO_ERROR, &tty->flags);
 956                         return 0;
 957                 } else
 958                         return -ENODEV;
 959         }
 960
 961         /*
 962          * Clear the interrupt registers.
 963          */
 964         (void) inb(info->ioaddr + UART_LSR);
 965         (void) inb(info->ioaddr + UART_RX);
 966         (void) inb(info->ioaddr + UART_IIR);
 967         (void) inb(info->ioaddr + UART_MSR);
 968
 969         /*
 970          * Now, initialize the UART
 971          */
 972         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 973         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 974         outb(info->MCR, info->ioaddr + UART_MCR);
 975
 976         /*
 977          * Finally, enable interrupts
 978          */
 979         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 980
 981         if (info->board->chip_flag)
 982                 info->IER |= MOXA_MUST_IER_EGDAI;
 983         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 984
 985         /*
 986          * And clear the interrupt registers again for luck.
 987          */
 988         (void) inb(info->ioaddr + UART_LSR);
 989         (void) inb(info->ioaddr + UART_RX);
 990         (void) inb(info->ioaddr + UART_IIR);
 991         (void) inb(info->ioaddr + UART_MSR);
 992
 993         clear_bit(TTY_IO_ERROR, &tty->flags);
 994         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 995
 996         /*
 997          * and set the speed of the serial port
 998          */
 999         mxser_change_speed(tty, NULL);
1000         info->port.flags |= ASYNC_INITIALIZED;
1001         spin_unlock_irqrestore(&info->slock, flags);
1002
1003         return 0;
1004 }
1005
1006 /*
1007  * This routine will shutdown a serial port; interrupts maybe disabled, and
1008  * DTR is dropped if the hangup on close termio flag is on.
1009  */
1010 static void mxser_shutdown(struct tty_struct *tty)
1011 {
1012         struct mxser_port *info = tty->driver_data;
1013         unsigned long flags;
1014
1015         if (!(info->port.flags & ASYNC_INITIALIZED))
1016                 return;
1017
1018         spin_lock_irqsave(&info->slock, flags);
1019
1020         /*
1021          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1022          * here so the queue might never be waken up
1023          */
1024         wake_up_interruptible(&info->delta_msr_wait);
1025
1026         /*
1027          * Free the IRQ, if necessary
1028          */
1029         if (info->port.xmit_buf) {
1030                 free_page((unsigned long) info->port.xmit_buf);
1031                 info->port.xmit_buf = NULL;
1032         }
1033
1034         info->IER = 0;
1035         outb(0x00, info->ioaddr + UART_IER);
1036
1037         if (tty->termios->c_cflag & HUPCL)
1038                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1039         outb(info->MCR, info->ioaddr + UART_MCR);
1040
1041         /* clear Rx/Tx FIFO's */
1042         if (info->board->chip_flag)
1043                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1044                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1045                                 info->ioaddr + UART_FCR);
1046         else
1047                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1048                         info->ioaddr + UART_FCR);
1049
1050         /* read data port to reset things */
1051         (void) inb(info->ioaddr + UART_RX);
1052
1053         set_bit(TTY_IO_ERROR, &tty->flags);
1054
1055         info->port.flags &= ~ASYNC_INITIALIZED;
1056
1057         if (info->board->chip_flag)
1058                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1059
1060         spin_unlock_irqrestore(&info->slock, flags);
1061 }
1062
1063 /*
1064  * This routine is called whenever a serial port is opened.  It
1065  * enables interrupts for a serial port, linking in its async structure into
1066  * the IRQ chain.   It also performs the serial-specific
1067  * initialization for the tty structure.
1068  */
1069 static int mxser_open(struct tty_struct *tty, struct file *filp)
1070 {
1071         struct mxser_port *info;
1072         unsigned long flags;
1073         int retval, line;
1074
1075         line = tty->index;
1076         if (line == MXSER_PORTS)
1077                 return 0;
1078         if (line < 0 || line > MXSER_PORTS)
1079                 return -ENODEV;
1080         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1081         if (!info->ioaddr)
1082                 return -ENODEV;
1083
1084         tty->driver_data = info;
1085         tty_port_tty_set(&info->port, tty);
1086         /*
1087          * Start up serial port
1088          */
1089         spin_lock_irqsave(&info->slock, flags);
1090         info->port.count++;
1091         spin_unlock_irqrestore(&info->slock, flags);
1092         retval = mxser_startup(tty);
1093         if (retval)
1094                 return retval;
1095
1096         retval = mxser_block_til_ready(tty, filp, info);
1097         if (retval)
1098                 return retval;
1099
1100         /* unmark here for very high baud rate (ex. 921600 bps) used */
1101         tty->low_latency = 1;
1102         return 0;
1103 }
1104
1105 static void mxser_flush_buffer(struct tty_struct *tty)
1106 {
1107         struct mxser_port *info = tty->driver_data;
1108         char fcr;
1109         unsigned long flags;
1110
1111
1112         spin_lock_irqsave(&info->slock, flags);
1113         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1114
1115         fcr = inb(info->ioaddr + UART_FCR);
1116         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1117                 info->ioaddr + UART_FCR);
1118         outb(fcr, info->ioaddr + UART_FCR);
1119
1120         spin_unlock_irqrestore(&info->slock, flags);
1121
1122         tty_wakeup(tty);
1123 }
1124
1125
1126 /*
1127  * This routine is called when the serial port gets closed.  First, we
1128  * wait for the last remaining data to be sent.  Then, we unlink its
1129  * async structure from the interrupt chain if necessary, and we free
1130  * that IRQ if nothing is left in the chain.
1131  */
1132 static void mxser_close(struct tty_struct *tty, struct file *filp)
1133 {
1134         struct mxser_port *info = tty->driver_data;
1135
1136         unsigned long timeout;
1137         unsigned long flags;
1138
1139         if (tty->index == MXSER_PORTS)
1140                 return;
1141         if (!info)
1142                 return;
1143
1144         spin_lock_irqsave(&info->slock, flags);
1145
1146         if (tty_hung_up_p(filp)) {
1147                 spin_unlock_irqrestore(&info->slock, flags);
1148                 return;
1149         }
1150         if ((tty->count == 1) && (info->port.count != 1)) {
1151                 /*
1152                  * Uh, oh.  tty->count is 1, which means that the tty
1153                  * structure will be freed.  Info->port.count should always
1154                  * be one in these conditions.  If it's greater than
1155                  * one, we've got real problems, since it means the
1156                  * serial port won't be shutdown.
1157                  */
1158                 printk(KERN_ERR "mxser_close: bad serial port count; "
1159                         "tty->count is 1, info->port.count is %d\n", info->port.count);
1160                 info->port.count = 1;
1161         }
1162         if (--info->port.count < 0) {
1163                 printk(KERN_ERR "mxser_close: bad serial port count for "
1164                         "ttys%d: %d\n", tty->index, info->port.count);
1165                 info->port.count = 0;
1166         }
1167         if (info->port.count) {
1168                 spin_unlock_irqrestore(&info->slock, flags);
1169                 return;
1170         }
1171         info->port.flags |= ASYNC_CLOSING;
1172         spin_unlock_irqrestore(&info->slock, flags);
1173         /*
1174          * Save the termios structure, since this port may have
1175          * separate termios for callout and dialin.
1176          */
1177         if (info->port.flags & ASYNC_NORMAL_ACTIVE)
1178                 info->normal_termios = *tty->termios;
1179         /*
1180          * Now we wait for the transmit buffer to clear; and we notify
1181          * the line discipline to only process XON/XOFF characters.
1182          */
1183         tty->closing = 1;
1184         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1185                 tty_wait_until_sent(tty, info->port.closing_wait);
1186         /*
1187          * At this point we stop accepting input.  To do this, we
1188          * disable the receive line status interrupts, and tell the
1189          * interrupt driver to stop checking the data ready bit in the
1190          * line status register.
1191          */
1192         info->IER &= ~UART_IER_RLSI;
1193         if (info->board->chip_flag)
1194                 info->IER &= ~MOXA_MUST_RECV_ISR;
1195
1196         if (info->port.flags & ASYNC_INITIALIZED) {
1197                 outb(info->IER, info->ioaddr + UART_IER);
1198                 /*
1199                  * Before we drop DTR, make sure the UART transmitter
1200                  * has completely drained; this is especially
1201                  * important if there is a transmit FIFO!
1202                  */
1203                 timeout = jiffies + HZ;
1204                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1205                         schedule_timeout_interruptible(5);
1206                         if (time_after(jiffies, timeout))
1207                                 break;
1208                 }
1209         }
1210         mxser_shutdown(tty);
1211
1212         mxser_flush_buffer(tty);
1213         tty_ldisc_flush(tty);
1214
1215         tty->closing = 0;
1216         tty_port_tty_set(&info->port, NULL);
1217         if (info->port.blocked_open) {
1218                 if (info->port.close_delay)
1219                         schedule_timeout_interruptible(info->port.close_delay);
1220                 wake_up_interruptible(&info->port.open_wait);
1221         }
1222
1223         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1224 }
1225
1226 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1227 {
1228         int c, total = 0;
1229         struct mxser_port *info = tty->driver_data;
1230         unsigned long flags;
1231
1232         if (!info->port.xmit_buf)
1233                 return 0;
1234
1235         while (1) {
1236                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1237                                           SERIAL_XMIT_SIZE - info->xmit_head));
1238                 if (c <= 0)
1239                         break;
1240
1241                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1242                 spin_lock_irqsave(&info->slock, flags);
1243                 info->xmit_head = (info->xmit_head + c) &
1244                                   (SERIAL_XMIT_SIZE - 1);
1245                 info->xmit_cnt += c;
1246                 spin_unlock_irqrestore(&info->slock, flags);
1247
1248                 buf += c;
1249                 count -= c;
1250                 total += c;
1251         }
1252
1253         if (info->xmit_cnt && !tty->stopped) {
1254                 if (!tty->hw_stopped ||
1255                                 (info->type == PORT_16550A) ||
1256                                 (info->board->chip_flag)) {
1257                         spin_lock_irqsave(&info->slock, flags);
1258                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1259                                         UART_IER);
1260                         info->IER |= UART_IER_THRI;
1261                         outb(info->IER, info->ioaddr + UART_IER);
1262                         spin_unlock_irqrestore(&info->slock, flags);
1263                 }
1264         }
1265         return total;
1266 }
1267
1268 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1269 {
1270         struct mxser_port *info = tty->driver_data;
1271         unsigned long flags;
1272
1273         if (!info->port.xmit_buf)
1274                 return 0;
1275
1276         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1277                 return 0;
1278
1279         spin_lock_irqsave(&info->slock, flags);
1280         info->port.xmit_buf[info->xmit_head++] = ch;
1281         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1282         info->xmit_cnt++;
1283         spin_unlock_irqrestore(&info->slock, flags);
1284         if (!tty->stopped) {
1285                 if (!tty->hw_stopped ||
1286                                 (info->type == PORT_16550A) ||
1287                                 info->board->chip_flag) {
1288                         spin_lock_irqsave(&info->slock, flags);
1289                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1290                         info->IER |= UART_IER_THRI;
1291                         outb(info->IER, info->ioaddr + UART_IER);
1292                         spin_unlock_irqrestore(&info->slock, flags);
1293                 }
1294         }
1295         return 1;
1296 }
1297
1298
1299 static void mxser_flush_chars(struct tty_struct *tty)
1300 {
1301         struct mxser_port *info = tty->driver_data;
1302         unsigned long flags;
1303
1304         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1305                         (tty->hw_stopped && info->type != PORT_16550A &&
1306                          !info->board->chip_flag))
1307                 return;
1308
1309         spin_lock_irqsave(&info->slock, flags);
1310
1311         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1312         info->IER |= UART_IER_THRI;
1313         outb(info->IER, info->ioaddr + UART_IER);
1314
1315         spin_unlock_irqrestore(&info->slock, flags);
1316 }
1317
1318 static int mxser_write_room(struct tty_struct *tty)
1319 {
1320         struct mxser_port *info = tty->driver_data;
1321         int ret;
1322
1323         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1324         return ret < 0 ? 0 : ret;
1325 }
1326
1327 static int mxser_chars_in_buffer(struct tty_struct *tty)
1328 {
1329         struct mxser_port *info = tty->driver_data;
1330         return info->xmit_cnt;
1331 }
1332
1333 /*
1334  * ------------------------------------------------------------
1335  * friends of mxser_ioctl()
1336  * ------------------------------------------------------------
1337  */
1338 static int mxser_get_serial_info(struct tty_struct *tty,
1339                 struct serial_struct __user *retinfo)
1340 {
1341         struct mxser_port *info = tty->driver_data;
1342         struct serial_struct tmp = {
1343                 .type = info->type,
1344                 .line = tty->index,
1345                 .port = info->ioaddr,
1346                 .irq = info->board->irq,
1347                 .flags = info->port.flags,
1348                 .baud_base = info->baud_base,
1349                 .close_delay = info->port.close_delay,
1350                 .closing_wait = info->port.closing_wait,
1351                 .custom_divisor = info->custom_divisor,
1352                 .hub6 = 0
1353         };
1354         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1355                 return -EFAULT;
1356         return 0;
1357 }
1358
1359 static int mxser_set_serial_info(struct tty_struct *tty,
1360                 struct serial_struct __user *new_info)
1361 {
1362         struct mxser_port *info = tty->driver_data;
1363         struct serial_struct new_serial;
1364         speed_t baud;
1365         unsigned long sl_flags;
1366         unsigned int flags;
1367         int retval = 0;
1368
1369         if (!new_info || !info->ioaddr)
1370                 return -ENODEV;
1371         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1372                 return -EFAULT;
1373
1374         if (new_serial.irq != info->board->irq ||
1375                         new_serial.port != info->ioaddr)
1376                 return -EINVAL;
1377
1378         flags = info->port.flags & ASYNC_SPD_MASK;
1379
1380         if (!capable(CAP_SYS_ADMIN)) {
1381                 if ((new_serial.baud_base != info->baud_base) ||
1382                                 (new_serial.close_delay != info->port.close_delay) ||
1383                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1384                         return -EPERM;
1385                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1386                                 (new_serial.flags & ASYNC_USR_MASK));
1387         } else {
1388                 /*
1389                  * OK, past this point, all the error checking has been done.
1390                  * At this point, we start making changes.....
1391                  */
1392                 info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
1393                                 (new_serial.flags & ASYNC_FLAGS));
1394                 info->port.close_delay = new_serial.close_delay * HZ / 100;
1395                 info->port.closing_wait = new_serial.closing_wait * HZ / 100;
1396                 tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY)
1397                                                                 ? 1 : 0;
1398                 if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1399                                 (new_serial.baud_base != info->baud_base ||
1400                                 new_serial.custom_divisor !=
1401                                 info->custom_divisor)) {
1402                         baud = new_serial.baud_base / new_serial.custom_divisor;
1403                         tty_encode_baud_rate(tty, baud, baud);
1404                 }
1405         }
1406
1407         info->type = new_serial.type;
1408
1409         process_txrx_fifo(info);
1410
1411         if (info->port.flags & ASYNC_INITIALIZED) {
1412                 if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
1413                         spin_lock_irqsave(&info->slock, sl_flags);
1414                         mxser_change_speed(tty, NULL);
1415                         spin_unlock_irqrestore(&info->slock, sl_flags);
1416                 }
1417         } else
1418                 retval = mxser_startup(tty);
1419
1420         return retval;
1421 }
1422
1423 /*
1424  * mxser_get_lsr_info - get line status register info
1425  *
1426  * Purpose: Let user call ioctl() to get info when the UART physically
1427  *          is emptied.  On bus types like RS485, the transmitter must
1428  *          release the bus after transmitting. This must be done when
1429  *          the transmit shift register is empty, not be done when the
1430  *          transmit holding register is empty.  This functionality
1431  *          allows an RS485 driver to be written in user space.
1432  */
1433 static int mxser_get_lsr_info(struct mxser_port *info,
1434                 unsigned int __user *value)
1435 {
1436         unsigned char status;
1437         unsigned int result;
1438         unsigned long flags;
1439
1440         spin_lock_irqsave(&info->slock, flags);
1441         status = inb(info->ioaddr + UART_LSR);
1442         spin_unlock_irqrestore(&info->slock, flags);
1443         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1444         return put_user(result, value);
1445 }
1446
1447 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1448 {
1449         struct mxser_port *info = tty->driver_data;
1450         unsigned char control, status;
1451         unsigned long flags;
1452
1453
1454         if (tty->index == MXSER_PORTS)
1455                 return -ENOIOCTLCMD;
1456         if (test_bit(TTY_IO_ERROR, &tty->flags))
1457                 return -EIO;
1458
1459         control = info->MCR;
1460
1461         spin_lock_irqsave(&info->slock, flags);
1462         status = inb(info->ioaddr + UART_MSR);
1463         if (status & UART_MSR_ANY_DELTA)
1464                 mxser_check_modem_status(tty, info, status);
1465         spin_unlock_irqrestore(&info->slock, flags);
1466         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1467                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1468                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1469                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1470                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1471                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1472 }
1473
1474 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1475                 unsigned int set, unsigned int clear)
1476 {
1477         struct mxser_port *info = tty->driver_data;
1478         unsigned long flags;
1479
1480
1481         if (tty->index == MXSER_PORTS)
1482                 return -ENOIOCTLCMD;
1483         if (test_bit(TTY_IO_ERROR, &tty->flags))
1484                 return -EIO;
1485
1486         spin_lock_irqsave(&info->slock, flags);
1487
1488         if (set & TIOCM_RTS)
1489                 info->MCR |= UART_MCR_RTS;
1490         if (set & TIOCM_DTR)
1491                 info->MCR |= UART_MCR_DTR;
1492
1493         if (clear & TIOCM_RTS)
1494                 info->MCR &= ~UART_MCR_RTS;
1495         if (clear & TIOCM_DTR)
1496                 info->MCR &= ~UART_MCR_DTR;
1497
1498         outb(info->MCR, info->ioaddr + UART_MCR);
1499         spin_unlock_irqrestore(&info->slock, flags);
1500         return 0;
1501 }
1502
1503 static int __init mxser_program_mode(int port)
1504 {
1505         int id, i, j, n;
1506
1507         outb(0, port);
1508         outb(0, port);
1509         outb(0, port);
1510         (void)inb(port);
1511         (void)inb(port);
1512         outb(0, port);
1513         (void)inb(port);
1514
1515         id = inb(port + 1) & 0x1F;
1516         if ((id != C168_ASIC_ID) &&
1517                         (id != C104_ASIC_ID) &&
1518                         (id != C102_ASIC_ID) &&
1519                         (id != CI132_ASIC_ID) &&
1520                         (id != CI134_ASIC_ID) &&
1521                         (id != CI104J_ASIC_ID))
1522                 return -1;
1523         for (i = 0, j = 0; i < 4; i++) {
1524                 n = inb(port + 2);
1525                 if (n == 'M') {
1526                         j = 1;
1527                 } else if ((j == 1) && (n == 1)) {
1528                         j = 2;
1529                         break;
1530                 } else
1531                         j = 0;
1532         }
1533         if (j != 2)
1534                 id = -2;
1535         return id;
1536 }
1537
1538 static void __init mxser_normal_mode(int port)
1539 {
1540         int i, n;
1541
1542         outb(0xA5, port + 1);
1543         outb(0x80, port + 3);
1544         outb(12, port + 0);     /* 9600 bps */
1545         outb(0, port + 1);
1546         outb(0x03, port + 3);   /* 8 data bits */
1547         outb(0x13, port + 4);   /* loop back mode */
1548         for (i = 0; i < 16; i++) {
1549                 n = inb(port + 5);
1550                 if ((n & 0x61) == 0x60)
1551                         break;
1552                 if ((n & 1) == 1)
1553                         (void)inb(port);
1554         }
1555         outb(0x00, port + 4);
1556 }
1557
1558 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1559 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1560 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1561 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1562 #define EN_CCMD         0x000   /* Chip's command register     */
1563 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1564 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1565 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1566 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1567 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1568 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1569 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1570 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1571 static int __init mxser_read_register(int port, unsigned short *regs)
1572 {
1573         int i, k, value, id;
1574         unsigned int j;
1575
1576         id = mxser_program_mode(port);
1577         if (id < 0)
1578                 return id;
1579         for (i = 0; i < 14; i++) {
1580                 k = (i & 0x3F) | 0x180;
1581                 for (j = 0x100; j > 0; j >>= 1) {
1582                         outb(CHIP_CS, port);
1583                         if (k & j) {
1584                                 outb(CHIP_CS | CHIP_DO, port);
1585                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1586                         } else {
1587                                 outb(CHIP_CS, port);
1588                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1589                         }
1590                 }
1591                 (void)inb(port);
1592                 value = 0;
1593                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1594                         outb(CHIP_CS, port);
1595                         outb(CHIP_CS | CHIP_SK, port);
1596                         if (inb(port) & CHIP_DI)
1597                                 value |= j;
1598                 }
1599                 regs[i] = value;
1600                 outb(0, port);
1601         }
1602         mxser_normal_mode(port);
1603         return id;
1604 }
1605
1606 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1607 {
1608         struct mxser_port *port;
1609         struct tty_struct *tty;
1610         int result, status;
1611         unsigned int i, j;
1612         int ret = 0;
1613
1614         switch (cmd) {
1615         case MOXA_GET_MAJOR:
1616                 if (printk_ratelimit())
1617                         printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1618                                         "%x (GET_MAJOR), fix your userspace\n",
1619                                         current->comm, cmd);
1620                 return put_user(ttymajor, (int __user *)argp);
1621
1622         case MOXA_CHKPORTENABLE:
1623                 result = 0;
1624                 lock_kernel();
1625                 for (i = 0; i < MXSER_BOARDS; i++)
1626                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1627                                 if (mxser_boards[i].ports[j].ioaddr)
1628                                         result |= (1 << i);
1629                 unlock_kernel();
1630                 return put_user(result, (unsigned long __user *)argp);
1631         case MOXA_GETDATACOUNT:
1632                 lock_kernel();
1633                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1634                         ret = -EFAULT;
1635                 unlock_kernel();
1636                 return ret;
1637         case MOXA_GETMSTATUS: {
1638                 struct mxser_mstatus ms, __user *msu = argp;
1639                 lock_kernel();
1640                 for (i = 0; i < MXSER_BOARDS; i++)
1641                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1642                                 port = &mxser_boards[i].ports[j];
1643                                 memset(&ms, 0, sizeof(ms));
1644
1645                                 if (!port->ioaddr)
1646                                         goto copy;
1647
1648                                 tty = tty_port_tty_get(&port->port);
1649
1650                                 if (!tty || !tty->termios)
1651                                         ms.cflag = port->normal_termios.c_cflag;
1652                                 else
1653                                         ms.cflag = tty->termios->c_cflag;
1654                                 tty_kref_put(tty);
1655                                 status = inb(port->ioaddr + UART_MSR);
1656                                 if (status & UART_MSR_DCD)
1657                                         ms.dcd = 1;
1658                                 if (status & UART_MSR_DSR)
1659                                         ms.dsr = 1;
1660                                 if (status & UART_MSR_CTS)
1661                                         ms.cts = 1;
1662                         copy:
1663                                 if (copy_to_user(msu, &ms, sizeof(ms))) {
1664                                         unlock_kernel();
1665                                         return -EFAULT;
1666                                 }
1667                                 msu++;
1668                         }
1669                 unlock_kernel();
1670                 return 0;
1671         }
1672         case MOXA_ASPP_MON_EXT: {
1673                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1674                 unsigned int cflag, iflag, p;
1675                 u8 opmode;
1676
1677                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1678                 if (!me)
1679                         return -ENOMEM;
1680
1681                 lock_kernel();
1682                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1683                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1684                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1685                                         i = MXSER_BOARDS;
1686                                         break;
1687                                 }
1688                                 port = &mxser_boards[i].ports[j];
1689                                 if (!port->ioaddr)
1690                                         continue;
1691
1692                                 status = mxser_get_msr(port->ioaddr, 0, p);
1693
1694                                 if (status & UART_MSR_TERI)
1695                                         port->icount.rng++;
1696                                 if (status & UART_MSR_DDSR)
1697                                         port->icount.dsr++;
1698                                 if (status & UART_MSR_DDCD)
1699                                         port->icount.dcd++;
1700                                 if (status & UART_MSR_DCTS)
1701                                         port->icount.cts++;
1702
1703                                 port->mon_data.modem_status = status;
1704                                 me->rx_cnt[p] = port->mon_data.rxcnt;
1705                                 me->tx_cnt[p] = port->mon_data.txcnt;
1706                                 me->up_rxcnt[p] = port->mon_data.up_rxcnt;
1707                                 me->up_txcnt[p] = port->mon_data.up_txcnt;
1708                                 me->modem_status[p] =
1709                                         port->mon_data.modem_status;
1710                                 tty = tty_port_tty_get(&port->port);
1711
1712                                 if (!tty || !tty->termios) {
1713                                         cflag = port->normal_termios.c_cflag;
1714                                         iflag = port->normal_termios.c_iflag;
1715                                         me->baudrate[p] = tty_termios_baud_rate(&port->normal_termios);
1716                                 } else {
1717                                         cflag = tty->termios->c_cflag;
1718                                         iflag = tty->termios->c_iflag;
1719                                         me->baudrate[p] = tty_get_baud_rate(tty);
1720                                 }
1721                                 tty_kref_put(tty);
1722
1723                                 me->databits[p] = cflag & CSIZE;
1724                                 me->stopbits[p] = cflag & CSTOPB;
1725                                 me->parity[p] = cflag & (PARENB | PARODD |
1726                                                 CMSPAR);
1727
1728                                 if (cflag & CRTSCTS)
1729                                         me->flowctrl[p] |= 0x03;
1730
1731                                 if (iflag & (IXON | IXOFF))
1732                                         me->flowctrl[p] |= 0x0C;
1733
1734                                 if (port->type == PORT_16550A)
1735                                         me->fifo[p] = 1;
1736
1737                                 opmode = inb(port->opmode_ioaddr) >>
1738                                                 ((p % 4) * 2);
1739                                 opmode &= OP_MODE_MASK;
1740                                 me->iftype[p] = opmode;
1741                         }
1742                 }
1743                 unlock_kernel();
1744                 if (copy_to_user(argp, me, sizeof(*me)))
1745                         ret = -EFAULT;
1746                 kfree(me);
1747                 return ret;
1748         }
1749         default:
1750                 return -ENOIOCTLCMD;
1751         }
1752         return 0;
1753 }
1754
1755 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1756                 struct async_icount *cprev)
1757 {
1758         struct async_icount cnow;
1759         unsigned long flags;
1760         int ret;
1761
1762         spin_lock_irqsave(&info->slock, flags);
1763         cnow = info->icount;    /* atomic copy */
1764         spin_unlock_irqrestore(&info->slock, flags);
1765
1766         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1767                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1768                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1769                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1770
1771         *cprev = cnow;
1772
1773         return ret;
1774 }
1775
1776 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1777                 unsigned int cmd, unsigned long arg)
1778 {
1779         struct mxser_port *info = tty->driver_data;
1780         struct async_icount cnow;
1781         unsigned long flags;
1782         void __user *argp = (void __user *)arg;
1783         int retval;
1784
1785         if (tty->index == MXSER_PORTS)
1786                 return mxser_ioctl_special(cmd, argp);
1787
1788         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1789                 int p;
1790                 unsigned long opmode;
1791                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1792                 int shiftbit;
1793                 unsigned char val, mask;
1794
1795                 p = tty->index % 4;
1796                 if (cmd == MOXA_SET_OP_MODE) {
1797                         if (get_user(opmode, (int __user *) argp))
1798                                 return -EFAULT;
1799                         if (opmode != RS232_MODE &&
1800                                         opmode != RS485_2WIRE_MODE &&
1801                                         opmode != RS422_MODE &&
1802                                         opmode != RS485_4WIRE_MODE)
1803                                 return -EFAULT;
1804                         lock_kernel();
1805                         mask = ModeMask[p];
1806                         shiftbit = p * 2;
1807                         val = inb(info->opmode_ioaddr);
1808                         val &= mask;
1809                         val |= (opmode << shiftbit);
1810                         outb(val, info->opmode_ioaddr);
1811                         unlock_kernel();
1812                 } else {
1813                         lock_kernel();
1814                         shiftbit = p * 2;
1815                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1816                         opmode &= OP_MODE_MASK;
1817                         unlock_kernel();
1818                         if (put_user(opmode, (int __user *)argp))
1819                                 return -EFAULT;
1820                 }
1821                 return 0;
1822         }
1823
1824         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1825                         test_bit(TTY_IO_ERROR, &tty->flags))
1826                 return -EIO;
1827
1828         switch (cmd) {
1829         case TIOCGSERIAL:
1830                 lock_kernel();
1831                 retval = mxser_get_serial_info(tty, argp);
1832                 unlock_kernel();
1833                 return retval;
1834         case TIOCSSERIAL:
1835                 lock_kernel();
1836                 retval = mxser_set_serial_info(tty, argp);
1837                 unlock_kernel();
1838                 return retval;
1839         case TIOCSERGETLSR:     /* Get line status register */
1840                 return  mxser_get_lsr_info(info, argp);
1841                 /*
1842                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1843                  * - mask passed in arg for lines of interest
1844                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1845                  * Caller should use TIOCGICOUNT to see which one it was
1846                  */
1847         case TIOCMIWAIT:
1848                 spin_lock_irqsave(&info->slock, flags);
1849                 cnow = info->icount;    /* note the counters on entry */
1850                 spin_unlock_irqrestore(&info->slock, flags);
1851
1852                 return wait_event_interruptible(info->delta_msr_wait,
1853                                 mxser_cflags_changed(info, arg, &cnow));
1854         /*
1855          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1856          * Return: write counters to the user passed counter struct
1857          * NB: both 1->0 and 0->1 transitions are counted except for
1858          *     RI where only 0->1 is counted.
1859          */
1860         case TIOCGICOUNT: {
1861                 struct serial_icounter_struct icnt = { 0 };
1862                 spin_lock_irqsave(&info->slock, flags);
1863                 cnow = info->icount;
1864                 spin_unlock_irqrestore(&info->slock, flags);
1865
1866                 icnt.frame = cnow.frame;
1867                 icnt.brk = cnow.brk;
1868                 icnt.overrun = cnow.overrun;
1869                 icnt.buf_overrun = cnow.buf_overrun;
1870                 icnt.parity = cnow.parity;
1871                 icnt.rx = cnow.rx;
1872                 icnt.tx = cnow.tx;
1873                 icnt.cts = cnow.cts;
1874                 icnt.dsr = cnow.dsr;
1875                 icnt.rng = cnow.rng;
1876                 icnt.dcd = cnow.dcd;
1877
1878                 return copy_to_user(argp, &icnt, sizeof(icnt)) ? -EFAULT : 0;
1879         }
1880         case MOXA_HighSpeedOn:
1881                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1882         case MOXA_SDS_RSTICOUNTER:
1883                 lock_kernel();
1884                 info->mon_data.rxcnt = 0;
1885                 info->mon_data.txcnt = 0;
1886                 unlock_kernel();
1887                 return 0;
1888
1889         case MOXA_ASPP_OQUEUE:{
1890                 int len, lsr;
1891
1892                 lock_kernel();
1893                 len = mxser_chars_in_buffer(tty);
1894                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1895                 len += (lsr ? 0 : 1);
1896                 unlock_kernel();
1897
1898                 return put_user(len, (int __user *)argp);
1899         }
1900         case MOXA_ASPP_MON: {
1901                 int mcr, status;
1902
1903                 lock_kernel();
1904                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1905                 mxser_check_modem_status(tty, info, status);
1906
1907                 mcr = inb(info->ioaddr + UART_MCR);
1908                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1909                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1910                 else
1911                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1912
1913                 if (mcr & MOXA_MUST_MCR_TX_XON)
1914                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1915                 else
1916                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1917
1918                 if (tty->hw_stopped)
1919                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1920                 else
1921                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1922                 unlock_kernel();
1923                 if (copy_to_user(argp, &info->mon_data,
1924                                 sizeof(struct mxser_mon)))
1925                         return -EFAULT;
1926
1927                 return 0;
1928         }
1929         case MOXA_ASPP_LSTATUS: {
1930                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1931                         return -EFAULT;
1932
1933                 info->err_shadow = 0;
1934                 return 0;
1935         }
1936         case MOXA_SET_BAUD_METHOD: {
1937                 int method;
1938
1939                 if (get_user(method, (int __user *)argp))
1940                         return -EFAULT;
1941                 mxser_set_baud_method[tty->index] = method;
1942                 return put_user(method, (int __user *)argp);
1943         }
1944         default:
1945                 return -ENOIOCTLCMD;
1946         }
1947         return 0;
1948 }
1949
1950 static void mxser_stoprx(struct tty_struct *tty)
1951 {
1952         struct mxser_port *info = tty->driver_data;
1953
1954         info->ldisc_stop_rx = 1;
1955         if (I_IXOFF(tty)) {
1956                 if (info->board->chip_flag) {
1957                         info->IER &= ~MOXA_MUST_RECV_ISR;
1958                         outb(info->IER, info->ioaddr + UART_IER);
1959                 } else {
1960                         info->x_char = STOP_CHAR(tty);
1961                         outb(0, info->ioaddr + UART_IER);
1962                         info->IER |= UART_IER_THRI;
1963                         outb(info->IER, info->ioaddr + UART_IER);
1964                 }
1965         }
1966
1967         if (tty->termios->c_cflag & CRTSCTS) {
1968                 info->MCR &= ~UART_MCR_RTS;
1969                 outb(info->MCR, info->ioaddr + UART_MCR);
1970         }
1971 }
1972
1973 /*
1974  * This routine is called by the upper-layer tty layer to signal that
1975  * incoming characters should be throttled.
1976  */
1977 static void mxser_throttle(struct tty_struct *tty)
1978 {
1979         mxser_stoprx(tty);
1980 }
1981
1982 static void mxser_unthrottle(struct tty_struct *tty)
1983 {
1984         struct mxser_port *info = tty->driver_data;
1985
1986         /* startrx */
1987         info->ldisc_stop_rx = 0;
1988         if (I_IXOFF(tty)) {
1989                 if (info->x_char)
1990                         info->x_char = 0;
1991                 else {
1992                         if (info->board->chip_flag) {
1993                                 info->IER |= MOXA_MUST_RECV_ISR;
1994                                 outb(info->IER, info->ioaddr + UART_IER);
1995                         } else {
1996                                 info->x_char = START_CHAR(tty);
1997                                 outb(0, info->ioaddr + UART_IER);
1998                                 info->IER |= UART_IER_THRI;
1999                                 outb(info->IER, info->ioaddr + UART_IER);
2000                         }
2001                 }
2002         }
2003
2004         if (tty->termios->c_cflag & CRTSCTS) {
2005                 info->MCR |= UART_MCR_RTS;
2006                 outb(info->MCR, info->ioaddr + UART_MCR);
2007         }
2008 }
2009
2010 /*
2011  * mxser_stop() and mxser_start()
2012  *
2013  * This routines are called before setting or resetting tty->stopped.
2014  * They enable or disable transmitter interrupts, as necessary.
2015  */
2016 static void mxser_stop(struct tty_struct *tty)
2017 {
2018         struct mxser_port *info = tty->driver_data;
2019         unsigned long flags;
2020
2021         spin_lock_irqsave(&info->slock, flags);
2022         if (info->IER & UART_IER_THRI) {
2023                 info->IER &= ~UART_IER_THRI;
2024                 outb(info->IER, info->ioaddr + UART_IER);
2025         }
2026         spin_unlock_irqrestore(&info->slock, flags);
2027 }
2028
2029 static void mxser_start(struct tty_struct *tty)
2030 {
2031         struct mxser_port *info = tty->driver_data;
2032         unsigned long flags;
2033
2034         spin_lock_irqsave(&info->slock, flags);
2035         if (info->xmit_cnt && info->port.xmit_buf) {
2036                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2037                 info->IER |= UART_IER_THRI;
2038                 outb(info->IER, info->ioaddr + UART_IER);
2039         }
2040         spin_unlock_irqrestore(&info->slock, flags);
2041 }
2042
2043 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2044 {
2045         struct mxser_port *info = tty->driver_data;
2046         unsigned long flags;
2047
2048         spin_lock_irqsave(&info->slock, flags);
2049         mxser_change_speed(tty, old_termios);
2050         spin_unlock_irqrestore(&info->slock, flags);
2051
2052         if ((old_termios->c_cflag & CRTSCTS) &&
2053                         !(tty->termios->c_cflag & CRTSCTS)) {
2054                 tty->hw_stopped = 0;
2055                 mxser_start(tty);
2056         }
2057
2058         /* Handle sw stopped */
2059         if ((old_termios->c_iflag & IXON) &&
2060                         !(tty->termios->c_iflag & IXON)) {
2061                 tty->stopped = 0;
2062
2063                 if (info->board->chip_flag) {
2064                         spin_lock_irqsave(&info->slock, flags);
2065                         mxser_disable_must_rx_software_flow_control(
2066                                         info->ioaddr);
2067                         spin_unlock_irqrestore(&info->slock, flags);
2068                 }
2069
2070                 mxser_start(tty);
2071         }
2072 }
2073
2074 /*
2075  * mxser_wait_until_sent() --- wait until the transmitter is empty
2076  */
2077 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2078 {
2079         struct mxser_port *info = tty->driver_data;
2080         unsigned long orig_jiffies, char_time;
2081         int lsr;
2082
2083         if (info->type == PORT_UNKNOWN)
2084                 return;
2085
2086         if (info->xmit_fifo_size == 0)
2087                 return;         /* Just in case.... */
2088
2089         orig_jiffies = jiffies;
2090         /*
2091          * Set the check interval to be 1/5 of the estimated time to
2092          * send a single character, and make it at least 1.  The check
2093          * interval should also be less than the timeout.
2094          *
2095          * Note: we have to use pretty tight timings here to satisfy
2096          * the NIST-PCTS.
2097          */
2098         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2099         char_time = char_time / 5;
2100         if (char_time == 0)
2101                 char_time = 1;
2102         if (timeout && timeout < char_time)
2103                 char_time = timeout;
2104         /*
2105          * If the transmitter hasn't cleared in twice the approximate
2106          * amount of time to send the entire FIFO, it probably won't
2107          * ever clear.  This assumes the UART isn't doing flow
2108          * control, which is currently the case.  Hence, if it ever
2109          * takes longer than info->timeout, this is probably due to a
2110          * UART bug of some kind.  So, we clamp the timeout parameter at
2111          * 2*info->timeout.
2112          */
2113         if (!timeout || timeout > 2 * info->timeout)
2114                 timeout = 2 * info->timeout;
2115 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2116         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2117                 timeout, char_time);
2118         printk("jiff=%lu...", jiffies);
2119 #endif
2120         lock_kernel();
2121         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2122 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2123                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2124 #endif
2125                 schedule_timeout_interruptible(char_time);
2126                 if (signal_pending(current))
2127                         break;
2128                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2129                         break;
2130         }
2131         set_current_state(TASK_RUNNING);
2132         unlock_kernel();
2133
2134 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2135         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2136 #endif
2137 }
2138
2139 /*
2140  * This routine is called by tty_hangup() when a hangup is signaled.
2141  */
2142 static void mxser_hangup(struct tty_struct *tty)
2143 {
2144         struct mxser_port *info = tty->driver_data;
2145
2146         mxser_flush_buffer(tty);
2147         mxser_shutdown(tty);
2148         info->port.count = 0;
2149         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2150         tty_port_tty_set(&info->port, NULL);
2151         wake_up_interruptible(&info->port.open_wait);
2152 }
2153
2154 /*
2155  * mxser_rs_break() --- routine which turns the break handling on or off
2156  */
2157 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2158 {
2159         struct mxser_port *info = tty->driver_data;
2160         unsigned long flags;
2161
2162         spin_lock_irqsave(&info->slock, flags);
2163         if (break_state == -1)
2164                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2165                         info->ioaddr + UART_LCR);
2166         else
2167                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2168                         info->ioaddr + UART_LCR);
2169         spin_unlock_irqrestore(&info->slock, flags);
2170         return 0;
2171 }
2172
2173 static void mxser_receive_chars(struct tty_struct *tty,
2174                                 struct mxser_port *port, int *status)
2175 {
2176         unsigned char ch, gdl;
2177         int ignored = 0;
2178         int cnt = 0;
2179         int recv_room;
2180         int max = 256;
2181
2182         recv_room = tty->receive_room;
2183         if (recv_room == 0 && !port->ldisc_stop_rx)
2184                 mxser_stoprx(tty);
2185         if (port->board->chip_flag != MOXA_OTHER_UART) {
2186
2187                 if (*status & UART_LSR_SPECIAL)
2188                         goto intr_old;
2189                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2190                                 (*status & MOXA_MUST_LSR_RERR))
2191                         goto intr_old;
2192                 if (*status & MOXA_MUST_LSR_RERR)
2193                         goto intr_old;
2194
2195                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2196
2197                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2198                         gdl &= MOXA_MUST_GDL_MASK;
2199                 if (gdl >= recv_room) {
2200                         if (!port->ldisc_stop_rx)
2201                                 mxser_stoprx(tty);
2202                 }
2203                 while (gdl--) {
2204                         ch = inb(port->ioaddr + UART_RX);
2205                         tty_insert_flip_char(tty, ch, 0);
2206                         cnt++;
2207                 }
2208                 goto end_intr;
2209         }
2210 intr_old:
2211
2212         do {
2213                 if (max-- < 0)
2214                         break;
2215
2216                 ch = inb(port->ioaddr + UART_RX);
2217                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2218                         outb(0x23, port->ioaddr + UART_FCR);
2219                 *status &= port->read_status_mask;
2220                 if (*status & port->ignore_status_mask) {
2221                         if (++ignored > 100)
2222                                 break;
2223                 } else {
2224                         char flag = 0;
2225                         if (*status & UART_LSR_SPECIAL) {
2226                                 if (*status & UART_LSR_BI) {
2227                                         flag = TTY_BREAK;
2228                                         port->icount.brk++;
2229
2230                                         if (port->port.flags & ASYNC_SAK)
2231                                                 do_SAK(tty);
2232                                 } else if (*status & UART_LSR_PE) {
2233                                         flag = TTY_PARITY;
2234                                         port->icount.parity++;
2235                                 } else if (*status & UART_LSR_FE) {
2236                                         flag = TTY_FRAME;
2237                                         port->icount.frame++;
2238                                 } else if (*status & UART_LSR_OE) {
2239                                         flag = TTY_OVERRUN;
2240                                         port->icount.overrun++;
2241                                 } else
2242                                         flag = TTY_BREAK;
2243                         }
2244                         tty_insert_flip_char(tty, ch, flag);
2245                         cnt++;
2246                         if (cnt >= recv_room) {
2247                                 if (!port->ldisc_stop_rx)
2248                                         mxser_stoprx(tty);
2249                                 break;
2250                         }
2251
2252                 }
2253
2254                 if (port->board->chip_flag)
2255                         break;
2256
2257                 *status = inb(port->ioaddr + UART_LSR);
2258         } while (*status & UART_LSR_DR);
2259
2260 end_intr:
2261         mxvar_log.rxcnt[tty->index] += cnt;
2262         port->mon_data.rxcnt += cnt;
2263         port->mon_data.up_rxcnt += cnt;
2264
2265         /*
2266          * We are called from an interrupt context with &port->slock
2267          * being held. Drop it temporarily in order to prevent
2268          * recursive locking.
2269          */
2270         spin_unlock(&port->slock);
2271         tty_flip_buffer_push(tty);
2272         spin_lock(&port->slock);
2273 }
2274
2275 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2276 {
2277         int count, cnt;
2278
2279         if (port->x_char) {
2280                 outb(port->x_char, port->ioaddr + UART_TX);
2281                 port->x_char = 0;
2282                 mxvar_log.txcnt[tty->index]++;
2283                 port->mon_data.txcnt++;
2284                 port->mon_data.up_txcnt++;
2285                 port->icount.tx++;
2286                 return;
2287         }
2288
2289         if (port->port.xmit_buf == NULL)
2290                 return;
2291
2292         if (port->xmit_cnt <= 0 || tty->stopped ||
2293                         (tty->hw_stopped &&
2294                         (port->type != PORT_16550A) &&
2295                         (!port->board->chip_flag))) {
2296                 port->IER &= ~UART_IER_THRI;
2297                 outb(port->IER, port->ioaddr + UART_IER);
2298                 return;
2299         }
2300
2301         cnt = port->xmit_cnt;
2302         count = port->xmit_fifo_size;
2303         do {
2304                 outb(port->port.xmit_buf[port->xmit_tail++],
2305                         port->ioaddr + UART_TX);
2306                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2307                 if (--port->xmit_cnt <= 0)
2308                         break;
2309         } while (--count > 0);
2310         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2311
2312         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2313         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2314         port->icount.tx += (cnt - port->xmit_cnt);
2315
2316         if (port->xmit_cnt < WAKEUP_CHARS && tty)
2317                 tty_wakeup(tty);
2318
2319         if (port->xmit_cnt <= 0) {
2320                 port->IER &= ~UART_IER_THRI;
2321                 outb(port->IER, port->ioaddr + UART_IER);
2322         }
2323 }
2324
2325 /*
2326  * This is the serial driver's generic interrupt routine
2327  */
2328 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2329 {
2330         int status, iir, i;
2331         struct mxser_board *brd = NULL;
2332         struct mxser_port *port;
2333         int max, irqbits, bits, msr;
2334         unsigned int int_cnt, pass_counter = 0;
2335         int handled = IRQ_NONE;
2336         struct tty_struct *tty;
2337
2338         for (i = 0; i < MXSER_BOARDS; i++)
2339                 if (dev_id == &mxser_boards[i]) {
2340                         brd = dev_id;
2341                         break;
2342                 }
2343
2344         if (i == MXSER_BOARDS)
2345                 goto irq_stop;
2346         if (brd == NULL)
2347                 goto irq_stop;
2348         max = brd->info->nports;
2349         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2350                 irqbits = inb(brd->vector) & brd->vector_mask;
2351                 if (irqbits == brd->vector_mask)
2352                         break;
2353
2354                 handled = IRQ_HANDLED;
2355                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2356                         if (irqbits == brd->vector_mask)
2357                                 break;
2358                         if (bits & irqbits)
2359                                 continue;
2360                         port = &brd->ports[i];
2361
2362                         int_cnt = 0;
2363                         spin_lock(&port->slock);
2364                         do {
2365                                 iir = inb(port->ioaddr + UART_IIR);
2366                                 if (iir & UART_IIR_NO_INT)
2367                                         break;
2368                                 iir &= MOXA_MUST_IIR_MASK;
2369                                 tty = tty_port_tty_get(&port->port);
2370                                 if (!tty ||
2371                                                 (port->port.flags & ASYNC_CLOSING) ||
2372                                                 !(port->port.flags &
2373                                                         ASYNC_INITIALIZED)) {
2374                                         status = inb(port->ioaddr + UART_LSR);
2375                                         outb(0x27, port->ioaddr + UART_FCR);
2376                                         inb(port->ioaddr + UART_MSR);
2377                                         tty_kref_put(tty);
2378                                         break;
2379                                 }
2380
2381                                 status = inb(port->ioaddr + UART_LSR);
2382
2383                                 if (status & UART_LSR_PE)
2384                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2385                                 if (status & UART_LSR_FE)
2386                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2387                                 if (status & UART_LSR_OE)
2388                                         port->err_shadow |=
2389                                                 NPPI_NOTIFY_HW_OVERRUN;
2390                                 if (status & UART_LSR_BI)
2391                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2392
2393                                 if (port->board->chip_flag) {
2394                                         if (iir == MOXA_MUST_IIR_GDA ||
2395                                             iir == MOXA_MUST_IIR_RDA ||
2396                                             iir == MOXA_MUST_IIR_RTO ||
2397                                             iir == MOXA_MUST_IIR_LSR)
2398                                                 mxser_receive_chars(tty, port,
2399                                                                 &status);
2400
2401                                 } else {
2402                                         status &= port->read_status_mask;
2403                                         if (status & UART_LSR_DR)
2404                                                 mxser_receive_chars(tty, port,
2405                                                                 &status);
2406                                 }
2407                                 msr = inb(port->ioaddr + UART_MSR);
2408                                 if (msr & UART_MSR_ANY_DELTA)
2409                                         mxser_check_modem_status(tty, port, msr);
2410
2411                                 if (port->board->chip_flag) {
2412                                         if (iir == 0x02 && (status &
2413                                                                 UART_LSR_THRE))
2414                                                 mxser_transmit_chars(tty, port);
2415                                 } else {
2416                                         if (status & UART_LSR_THRE)
2417                                                 mxser_transmit_chars(tty, port);
2418                                 }
2419                                 tty_kref_put(tty);
2420                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2421                         spin_unlock(&port->slock);
2422                 }
2423         }
2424
2425 irq_stop:
2426         return handled;
2427 }
2428
2429 static const struct tty_operations mxser_ops = {
2430         .open = mxser_open,
2431         .close = mxser_close,
2432         .write = mxser_write,
2433         .put_char = mxser_put_char,
2434         .flush_chars = mxser_flush_chars,
2435         .write_room = mxser_write_room,
2436         .chars_in_buffer = mxser_chars_in_buffer,
2437         .flush_buffer = mxser_flush_buffer,
2438         .ioctl = mxser_ioctl,
2439         .throttle = mxser_throttle,
2440         .unthrottle = mxser_unthrottle,
2441         .set_termios = mxser_set_termios,
2442         .stop = mxser_stop,
2443         .start = mxser_start,
2444         .hangup = mxser_hangup,
2445         .break_ctl = mxser_rs_break,
2446         .wait_until_sent = mxser_wait_until_sent,
2447         .tiocmget = mxser_tiocmget,
2448         .tiocmset = mxser_tiocmset,
2449 };
2450
2451 /*
2452  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2453  */
2454
2455 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2456                 unsigned int irq)
2457 {
2458         if (irq)
2459                 free_irq(brd->irq, brd);
2460         if (pdev != NULL) {     /* PCI */
2461 #ifdef CONFIG_PCI
2462                 pci_release_region(pdev, 2);
2463                 pci_release_region(pdev, 3);
2464 #endif
2465         } else {
2466                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2467                 release_region(brd->vector, 1);
2468         }
2469 }
2470
2471 static int __devinit mxser_initbrd(struct mxser_board *brd,
2472                 struct pci_dev *pdev)
2473 {
2474         struct mxser_port *info;
2475         unsigned int i;
2476         int retval;
2477
2478         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2479                         brd->ports[0].max_baud);
2480
2481         for (i = 0; i < brd->info->nports; i++) {
2482                 info = &brd->ports[i];
2483                 tty_port_init(&info->port);
2484                 info->board = brd;
2485                 info->stop_rx = 0;
2486                 info->ldisc_stop_rx = 0;
2487
2488                 /* Enhance mode enabled here */
2489                 if (brd->chip_flag != MOXA_OTHER_UART)
2490                         mxser_enable_must_enchance_mode(info->ioaddr);
2491
2492                 info->port.flags = ASYNC_SHARE_IRQ;
2493                 info->type = brd->uart_type;
2494
2495                 process_txrx_fifo(info);
2496
2497                 info->custom_divisor = info->baud_base * 16;
2498                 info->port.close_delay = 5 * HZ / 10;
2499                 info->port.closing_wait = 30 * HZ;
2500                 info->normal_termios = mxvar_sdriver->init_termios;
2501                 init_waitqueue_head(&info->delta_msr_wait);
2502                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2503                 info->err_shadow = 0;
2504                 spin_lock_init(&info->slock);
2505
2506                 /* before set INT ISR, disable all int */
2507                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2508                         info->ioaddr + UART_IER);
2509         }
2510
2511         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2512                         brd);
2513         if (retval) {
2514                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2515                         "conflict with another device.\n",
2516                         brd->info->name, brd->irq);
2517                 /* We hold resources, we need to release them. */
2518                 mxser_release_res(brd, pdev, 0);
2519         }
2520         return retval;
2521 }
2522
2523 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2524 {
2525         int id, i, bits;
2526         unsigned short regs[16], irq;
2527         unsigned char scratch, scratch2;
2528
2529         brd->chip_flag = MOXA_OTHER_UART;
2530
2531         id = mxser_read_register(cap, regs);
2532         switch (id) {
2533         case C168_ASIC_ID:
2534                 brd->info = &mxser_cards[0];
2535                 break;
2536         case C104_ASIC_ID:
2537                 brd->info = &mxser_cards[1];
2538                 break;
2539         case CI104J_ASIC_ID:
2540                 brd->info = &mxser_cards[2];
2541                 break;
2542         case C102_ASIC_ID:
2543                 brd->info = &mxser_cards[5];
2544                 break;
2545         case CI132_ASIC_ID:
2546                 brd->info = &mxser_cards[6];
2547                 break;
2548         case CI134_ASIC_ID:
2549                 brd->info = &mxser_cards[7];
2550                 break;
2551         default:
2552                 return 0;
2553         }
2554
2555         irq = 0;
2556         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2557            Flag-hack checks if configuration should be read as 2-port here. */
2558         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2559                 irq = regs[9] & 0xF000;
2560                 irq = irq | (irq >> 4);
2561                 if (irq != (regs[9] & 0xFF00))
2562                         goto err_irqconflict;
2563         } else if (brd->info->nports == 4) {
2564                 irq = regs[9] & 0xF000;
2565                 irq = irq | (irq >> 4);
2566                 irq = irq | (irq >> 8);
2567                 if (irq != regs[9])
2568                         goto err_irqconflict;
2569         } else if (brd->info->nports == 8) {
2570                 irq = regs[9] & 0xF000;
2571                 irq = irq | (irq >> 4);
2572                 irq = irq | (irq >> 8);
2573                 if ((irq != regs[9]) || (irq != regs[10]))
2574                         goto err_irqconflict;
2575         }
2576
2577         if (!irq) {
2578                 printk(KERN_ERR "mxser: interrupt number unset\n");
2579                 return -EIO;
2580         }
2581         brd->irq = ((int)(irq & 0xF000) >> 12);
2582         for (i = 0; i < 8; i++)
2583                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2584         if ((regs[12] & 0x80) == 0) {
2585                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2586                 return -EIO;
2587         }
2588         brd->vector = (int)regs[11];    /* interrupt vector */
2589         if (id == 1)
2590                 brd->vector_mask = 0x00FF;
2591         else
2592                 brd->vector_mask = 0x000F;
2593         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2594                 if (regs[12] & bits) {
2595                         brd->ports[i].baud_base = 921600;
2596                         brd->ports[i].max_baud = 921600;
2597                 } else {
2598                         brd->ports[i].baud_base = 115200;
2599                         brd->ports[i].max_baud = 115200;
2600                 }
2601         }
2602         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2603         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2604         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2605         outb(scratch2, cap + UART_LCR);
2606         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2607         scratch = inb(cap + UART_IIR);
2608
2609         if (scratch & 0xC0)
2610                 brd->uart_type = PORT_16550A;
2611         else
2612                 brd->uart_type = PORT_16450;
2613         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2614                         "mxser(IO)")) {
2615                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2616                                 "0x%.8lx-0x%.8lx\n",
2617                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2618                                 8 * brd->info->nports - 1);
2619                 return -EIO;
2620         }
2621         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2622                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2623                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2624                                 "0x%.8lx-0x%.8lx\n",
2625                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2626                                 8 * brd->info->nports - 1);
2627                 return -EIO;
2628         }
2629         return brd->info->nports;
2630
2631 err_irqconflict:
2632         printk(KERN_ERR "mxser: invalid interrupt number\n");
2633         return -EIO;
2634 }
2635
2636 static int __devinit mxser_probe(struct pci_dev *pdev,
2637                 const struct pci_device_id *ent)
2638 {
2639 #ifdef CONFIG_PCI
2640         struct mxser_board *brd;
2641         unsigned int i, j;
2642         unsigned long ioaddress;
2643         int retval = -EINVAL;
2644
2645         for (i = 0; i < MXSER_BOARDS; i++)
2646                 if (mxser_boards[i].info == NULL)
2647                         break;
2648
2649         if (i >= MXSER_BOARDS) {
2650                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2651                                 "not configured\n", MXSER_BOARDS);
2652                 goto err;
2653         }
2654
2655         brd = &mxser_boards[i];
2656         brd->idx = i * MXSER_PORTS_PER_BOARD;
2657         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2658                 mxser_cards[ent->driver_data].name,
2659                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2660
2661         retval = pci_enable_device(pdev);
2662         if (retval) {
2663                 dev_err(&pdev->dev, "PCI enable failed\n");
2664                 goto err;
2665         }
2666
2667         /* io address */
2668         ioaddress = pci_resource_start(pdev, 2);
2669         retval = pci_request_region(pdev, 2, "mxser(IO)");
2670         if (retval)
2671                 goto err;
2672
2673         brd->info = &mxser_cards[ent->driver_data];
2674         for (i = 0; i < brd->info->nports; i++)
2675                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2676
2677         /* vector */
2678         ioaddress = pci_resource_start(pdev, 3);
2679         retval = pci_request_region(pdev, 3, "mxser(vector)");
2680         if (retval)
2681                 goto err_relio;
2682         brd->vector = ioaddress;
2683
2684         /* irq */
2685         brd->irq = pdev->irq;
2686
2687         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2688         brd->uart_type = PORT_16550A;
2689         brd->vector_mask = 0;
2690
2691         for (i = 0; i < brd->info->nports; i++) {
2692                 for (j = 0; j < UART_INFO_NUM; j++) {
2693                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2694                                 brd->ports[i].max_baud =
2695                                         Gpci_uart_info[j].max_baud;
2696
2697                                 /* exception....CP-102 */
2698                                 if (brd->info->flags & MXSER_HIGHBAUD)
2699                                         brd->ports[i].max_baud = 921600;
2700                                 break;
2701                         }
2702                 }
2703         }
2704
2705         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2706                 for (i = 0; i < brd->info->nports; i++) {
2707                         if (i < 4)
2708                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2709                         else
2710                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2711                 }
2712                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2713                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2714         }
2715
2716         for (i = 0; i < brd->info->nports; i++) {
2717                 brd->vector_mask |= (1 << i);
2718                 brd->ports[i].baud_base = 921600;
2719         }
2720
2721         /* mxser_initbrd will hook ISR. */
2722         retval = mxser_initbrd(brd, pdev);
2723         if (retval)
2724                 goto err_null;
2725
2726         for (i = 0; i < brd->info->nports; i++)
2727                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2728
2729         pci_set_drvdata(pdev, brd);
2730
2731         return 0;
2732 err_relio:
2733         pci_release_region(pdev, 2);
2734 err_null:
2735         brd->info = NULL;
2736 err:
2737         return retval;
2738 #else
2739         return -ENODEV;
2740 #endif
2741 }
2742
2743 static void __devexit mxser_remove(struct pci_dev *pdev)
2744 {
2745         struct mxser_board *brd = pci_get_drvdata(pdev);
2746         unsigned int i;
2747
2748         for (i = 0; i < brd->info->nports; i++)
2749                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2750
2751         mxser_release_res(brd, pdev, 1);
2752         brd->info = NULL;
2753 }
2754
2755 static struct pci_driver mxser_driver = {
2756         .name = "mxser",
2757         .id_table = mxser_pcibrds,
2758         .probe = mxser_probe,
2759         .remove = __devexit_p(mxser_remove)
2760 };
2761
2762 static int __init mxser_module_init(void)
2763 {
2764         struct mxser_board *brd;
2765         unsigned int b, i, m;
2766         int retval;
2767
2768         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2769         if (!mxvar_sdriver)
2770                 return -ENOMEM;
2771
2772         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2773                 MXSER_VERSION);
2774
2775         /* Initialize the tty_driver structure */
2776         mxvar_sdriver->owner = THIS_MODULE;
2777         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2778         mxvar_sdriver->name = "ttyMI";
2779         mxvar_sdriver->major = ttymajor;
2780         mxvar_sdriver->minor_start = 0;
2781         mxvar_sdriver->num = MXSER_PORTS + 1;
2782         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2783         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2784         mxvar_sdriver->init_termios = tty_std_termios;
2785         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2786         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2787         tty_set_operations(mxvar_sdriver, &mxser_ops);
2788
2789         retval = tty_register_driver(mxvar_sdriver);
2790         if (retval) {
2791                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2792                                 "tty driver !\n");
2793                 goto err_put;
2794         }
2795
2796         /* Start finding ISA boards here */
2797         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2798                 if (!ioaddr[b])
2799                         continue;
2800
2801                 brd = &mxser_boards[m];
2802                 retval = mxser_get_ISA_conf(!ioaddr[b], brd);
2803                 if (retval <= 0) {
2804                         brd->info = NULL;
2805                         continue;
2806                 }
2807
2808                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2809                                 brd->info->name, ioaddr[b]);
2810
2811                 /* mxser_initbrd will hook ISR. */
2812                 if (mxser_initbrd(brd, NULL) < 0) {
2813                         brd->info = NULL;
2814                         continue;
2815                 }
2816
2817                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2818                 for (i = 0; i < brd->info->nports; i++)
2819                         tty_register_device(mxvar_sdriver, brd->idx + i, NULL);
2820
2821                 m++;
2822         }
2823
2824         retval = pci_register_driver(&mxser_driver);
2825         if (retval) {
2826                 printk(KERN_ERR "mxser: can't register pci driver\n");
2827                 if (!m) {
2828                         retval = -ENODEV;
2829                         goto err_unr;
2830                 } /* else: we have some ISA cards under control */
2831         }
2832
2833         return 0;
2834 err_unr:
2835         tty_unregister_driver(mxvar_sdriver);
2836 err_put:
2837         put_tty_driver(mxvar_sdriver);
2838         return retval;
2839 }
2840
2841 static void __exit mxser_module_exit(void)
2842 {
2843         unsigned int i, j;
2844
2845         pci_unregister_driver(&mxser_driver);
2846
2847         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2848                 if (mxser_boards[i].info != NULL)
2849                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2850                                 tty_unregister_device(mxvar_sdriver,
2851                                                 mxser_boards[i].idx + j);
2852         tty_unregister_driver(mxvar_sdriver);
2853         put_tty_driver(mxvar_sdriver);
2854
2855         for (i = 0; i < MXSER_BOARDS; i++)
2856                 if (mxser_boards[i].info != NULL)
2857                         mxser_release_res(&mxser_boards[i], NULL, 1);
2858 }
2859
2860 module_init(mxser_module_init);
2861 module_exit(mxser_module_exit);