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 #define MXSERCUMAJOR     175
  52
  53 #define MXSER_BOARDS            4       /* Max. boards */
  54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  56 #define MXSER_ISR_PASS_LIMIT    100
  57
  58 #define MXSER_ERR_IOADDR        -1
  59 #define MXSER_ERR_IRQ           -2
  60 #define MXSER_ERR_IRQ_CONFLIT   -3
  61 #define MXSER_ERR_VECTOR        -4
  62
  63 /*CheckIsMoxaMust return value*/
  64 #define MOXA_OTHER_UART         0x00
  65 #define MOXA_MUST_MU150_HWID    0x01
  66 #define MOXA_MUST_MU860_HWID    0x02
  67
  68 #define WAKEUP_CHARS            256
  69
  70 #define UART_MCR_AFE            0x20
  71 #define UART_LSR_SPECIAL        0x1E
  72
  73 #define PCI_DEVICE_ID_POS104UL  0x1044
  74 #define PCI_DEVICE_ID_CB108     0x1080
  75 #define PCI_DEVICE_ID_CP102UF   0x1023
  76 #define PCI_DEVICE_ID_CB114     0x1142
  77 #define PCI_DEVICE_ID_CP114UL   0x1143
  78 #define PCI_DEVICE_ID_CB134I    0x1341
  79 #define PCI_DEVICE_ID_CP138U    0x1380
  80
  81
  82 #define C168_ASIC_ID    1
  83 #define C104_ASIC_ID    2
  84 #define C102_ASIC_ID    0xB
  85 #define CI132_ASIC_ID   4
  86 #define CI134_ASIC_ID   3
  87 #define CI104J_ASIC_ID  5
  88
  89 #define MXSER_HIGHBAUD  1
  90 #define MXSER_HAS2      2
  91
  92 /* This is only for PCI */
  93 static const struct {
  94         int type;
  95         int tx_fifo;
  96         int rx_fifo;
  97         int xmit_fifo_size;
  98         int rx_high_water;
  99         int rx_trigger;
 100         int rx_low_water;
 101         long max_baud;
 102 } Gpci_uart_info[] = {
 103         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 104         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 105         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 106 };
 107 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 108
 109 struct mxser_cardinfo {
 110         char *name;
 111         unsigned int nports;
 112         unsigned int flags;
 113 };
 114
 115 static const struct mxser_cardinfo mxser_cards[] = {
 116 /* 0*/  { "C168 series",        8, },
 117         { "C104 series",        4, },
 118         { "CI-104J series",     4, },
 119         { "C168H/PCI series",   8, },
 120         { "C104H/PCI series",   4, },
 121 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 122         { "CI-132 series",      4, MXSER_HAS2 },
 123         { "CI-134 series",      4, },
 124         { "CP-132 series",      2, },
 125         { "CP-114 series",      4, },
 126 /*10*/  { "CT-114 series",      4, },
 127         { "CP-102 series",      2, MXSER_HIGHBAUD },
 128         { "CP-104U series",     4, },
 129         { "CP-168U series",     8, },
 130         { "CP-132U series",     2, },
 131 /*15*/  { "CP-134U series",     4, },
 132         { "CP-104JU series",    4, },
 133         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 134         { "CP-118U series",     8, },
 135         { "CP-102UL series",    2, },
 136 /*20*/  { "CP-102U series",     2, },
 137         { "CP-118EL series",    8, },
 138         { "CP-168EL series",    8, },
 139         { "CP-104EL series",    4, },
 140         { "CB-108 series",      8, },
 141 /*25*/  { "CB-114 series",      4, },
 142         { "CB-134I series",     4, },
 143         { "CP-138U series",     8, },
 144         { "POS-104UL series",   4, },
 145         { "CP-114UL series",    4, },
 146 /*30*/  { "CP-102UF series",    2, }
 147 };
 148
 149 /* driver_data correspond to the lines in the structure above
 150    see also ISA probe function before you change something */
 151 static struct pci_device_id mxser_pcibrds[] = {
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 175         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 176         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 177         { }
 178 };
 179 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 180
 181 static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 182 static int ttymajor = MXSERMAJOR;
 183
 184 /* Variables for insmod */
 185
 186 MODULE_AUTHOR("Casper Yang");
 187 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 188 module_param_array(ioaddr, int, NULL, 0);
 189 module_param(ttymajor, int, 0);
 190 MODULE_LICENSE("GPL");
 191
 192 struct mxser_log {
 193         int tick;
 194         unsigned long rxcnt[MXSER_PORTS];
 195         unsigned long txcnt[MXSER_PORTS];
 196 };
 197
 198
 199 struct mxser_mon {
 200         unsigned long rxcnt;
 201         unsigned long txcnt;
 202         unsigned long up_rxcnt;
 203         unsigned long up_txcnt;
 204         int modem_status;
 205         unsigned char hold_reason;
 206 };
 207
 208 struct mxser_mon_ext {
 209         unsigned long rx_cnt[32];
 210         unsigned long tx_cnt[32];
 211         unsigned long up_rxcnt[32];
 212         unsigned long up_txcnt[32];
 213         int modem_status[32];
 214
 215         long baudrate[32];
 216         int databits[32];
 217         int stopbits[32];
 218         int parity[32];
 219         int flowctrl[32];
 220         int fifo[32];
 221         int iftype[32];
 222 };
 223
 224 struct mxser_board;
 225
 226 struct mxser_port {
 227         struct tty_port port;
 228         struct mxser_board *board;
 229
 230         unsigned long ioaddr;
 231         unsigned long opmode_ioaddr;
 232         int max_baud;
 233
 234         int rx_high_water;
 235         int rx_trigger;         /* Rx fifo trigger level */
 236         int rx_low_water;
 237         int baud_base;          /* max. speed */
 238         int type;               /* UART type */
 239
 240         int x_char;             /* xon/xoff character */
 241         int IER;                /* Interrupt Enable Register */
 242         int MCR;                /* Modem control register */
 243
 244         unsigned char stop_rx;
 245         unsigned char ldisc_stop_rx;
 246
 247         int custom_divisor;
 248         unsigned char err_shadow;
 249
 250         struct async_icount icount; /* kernel counters for 4 input interrupts */
 251         int timeout;
 252
 253         int read_status_mask;
 254         int ignore_status_mask;
 255         int xmit_fifo_size;
 256         int xmit_head;
 257         int xmit_tail;
 258         int xmit_cnt;
 259
 260         struct ktermios normal_termios;
 261
 262         struct mxser_mon mon_data;
 263
 264         spinlock_t slock;
 265         wait_queue_head_t delta_msr_wait;
 266 };
 267
 268 struct mxser_board {
 269         unsigned int idx;
 270         int irq;
 271         const struct mxser_cardinfo *info;
 272         unsigned long vector;
 273         unsigned long vector_mask;
 274
 275         int chip_flag;
 276         int uart_type;
 277
 278         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 279 };
 280
 281 struct mxser_mstatus {
 282         tcflag_t cflag;
 283         int cts;
 284         int dsr;
 285         int ri;
 286         int dcd;
 287 };
 288
 289 static struct mxser_mstatus GMStatus[MXSER_PORTS];
 290
 291 static int mxserBoardCAP[MXSER_BOARDS] = {
 292         0, 0, 0, 0
 293         /*  0x180, 0x280, 0x200, 0x320 */
 294 };
 295
 296 static struct mxser_board mxser_boards[MXSER_BOARDS];
 297 static struct tty_driver *mxvar_sdriver;
 298 static struct mxser_log mxvar_log;
 299 static int mxvar_diagflag;
 300 static unsigned char mxser_msr[MXSER_PORTS + 1];
 301 static struct mxser_mon_ext mon_data_ext;
 302 static int mxser_set_baud_method[MXSER_PORTS + 1];
 303
 304 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 305 {
 306         u8 oldlcr;
 307         u8 efr;
 308
 309         oldlcr = inb(baseio + UART_LCR);
 310         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 311
 312         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 313         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 314
 315         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 316         outb(oldlcr, baseio + UART_LCR);
 317 }
 318
 319 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 320 {
 321         u8 oldlcr;
 322         u8 efr;
 323
 324         oldlcr = inb(baseio + UART_LCR);
 325         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 326
 327         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 328         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 329
 330         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 331         outb(oldlcr, baseio + UART_LCR);
 332 }
 333
 334 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 335 {
 336         u8 oldlcr;
 337         u8 efr;
 338
 339         oldlcr = inb(baseio + UART_LCR);
 340         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 341
 342         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 343         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 344         efr |= MOXA_MUST_EFR_BANK0;
 345
 346         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 347         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 348         outb(oldlcr, baseio + UART_LCR);
 349 }
 350
 351 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 352 {
 353         u8 oldlcr;
 354         u8 efr;
 355
 356         oldlcr = inb(baseio + UART_LCR);
 357         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 358
 359         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 360         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 361         efr |= MOXA_MUST_EFR_BANK0;
 362
 363         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 364         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 365         outb(oldlcr, baseio + UART_LCR);
 366 }
 367
 368 static void mxser_set_must_fifo_value(struct mxser_port *info)
 369 {
 370         u8 oldlcr;
 371         u8 efr;
 372
 373         oldlcr = inb(info->ioaddr + UART_LCR);
 374         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 375
 376         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 377         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 378         efr |= MOXA_MUST_EFR_BANK1;
 379
 380         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 381         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 382         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 383         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 384         outb(oldlcr, info->ioaddr + UART_LCR);
 385 }
 386
 387 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 388 {
 389         u8 oldlcr;
 390         u8 efr;
 391
 392         oldlcr = inb(baseio + UART_LCR);
 393         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 394
 395         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 396         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 397         efr |= MOXA_MUST_EFR_BANK2;
 398
 399         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 400         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 401         outb(oldlcr, baseio + UART_LCR);
 402 }
 403
 404 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 405 {
 406         u8 oldlcr;
 407         u8 efr;
 408
 409         oldlcr = inb(baseio + UART_LCR);
 410         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 411
 412         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 413         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 414         efr |= MOXA_MUST_EFR_BANK2;
 415
 416         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 417         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 418         outb(oldlcr, baseio + UART_LCR);
 419 }
 420
 421 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 422 {
 423         u8 oldlcr;
 424         u8 efr;
 425
 426         oldlcr = inb(baseio + UART_LCR);
 427         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 428
 429         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 430         efr &= ~MOXA_MUST_EFR_SF_MASK;
 431
 432         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 433         outb(oldlcr, baseio + UART_LCR);
 434 }
 435
 436 static void mxser_enable_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         efr |= MOXA_MUST_EFR_SF_TX1;
 447
 448         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 449         outb(oldlcr, baseio + UART_LCR);
 450 }
 451
 452 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 453 {
 454         u8 oldlcr;
 455         u8 efr;
 456
 457         oldlcr = inb(baseio + UART_LCR);
 458         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 459
 460         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 461         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 462
 463         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 464         outb(oldlcr, baseio + UART_LCR);
 465 }
 466
 467 static void mxser_enable_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         efr |= MOXA_MUST_EFR_SF_RX1;
 478
 479         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 480         outb(oldlcr, baseio + UART_LCR);
 481 }
 482
 483 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 484 {
 485         u8 oldlcr;
 486         u8 efr;
 487
 488         oldlcr = inb(baseio + UART_LCR);
 489         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 490
 491         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 492         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 493
 494         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 495         outb(oldlcr, baseio + UART_LCR);
 496 }
 497
 498 #ifdef CONFIG_PCI
 499 static int __devinit CheckIsMoxaMust(unsigned long io)
 500 {
 501         u8 oldmcr, hwid;
 502         int i;
 503
 504         outb(0, io + UART_LCR);
 505         mxser_disable_must_enchance_mode(io);
 506         oldmcr = inb(io + UART_MCR);
 507         outb(0, io + UART_MCR);
 508         mxser_set_must_xon1_value(io, 0x11);
 509         if ((hwid = inb(io + UART_MCR)) != 0) {
 510                 outb(oldmcr, io + UART_MCR);
 511                 return MOXA_OTHER_UART;
 512         }
 513
 514         mxser_get_must_hardware_id(io, &hwid);
 515         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 516                 if (hwid == Gpci_uart_info[i].type)
 517                         return (int)hwid;
 518         }
 519         return MOXA_OTHER_UART;
 520 }
 521 #endif
 522
 523 static void process_txrx_fifo(struct mxser_port *info)
 524 {
 525         int i;
 526
 527         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 528                 info->rx_trigger = 1;
 529                 info->rx_high_water = 1;
 530                 info->rx_low_water = 1;
 531                 info->xmit_fifo_size = 1;
 532         } else
 533                 for (i = 0; i < UART_INFO_NUM; i++)
 534                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 535                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 536                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 537                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 538                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 539                                 break;
 540                         }
 541 }
 542
 543 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 544 {
 545         unsigned char status = 0;
 546
 547         status = inb(baseaddr + UART_MSR);
 548
 549         mxser_msr[port] &= 0x0F;
 550         mxser_msr[port] |= status;
 551         status = mxser_msr[port];
 552         if (mode)
 553                 mxser_msr[port] = 0;
 554
 555         return status;
 556 }
 557
 558 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 559                 struct mxser_port *port)
 560 {
 561         DECLARE_WAITQUEUE(wait, current);
 562         int retval;
 563         int do_clocal = 0;
 564         unsigned long flags;
 565
 566         /*
 567          * If non-blocking mode is set, or the port is not enabled,
 568          * then make the check up front and then exit.
 569          */
 570         if ((filp->f_flags & O_NONBLOCK) ||
 571                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 572                 port->port.flags |= ASYNC_NORMAL_ACTIVE;
 573                 return 0;
 574         }
 575
 576         if (tty->termios->c_cflag & CLOCAL)
 577                 do_clocal = 1;
 578
 579         /*
 580          * Block waiting for the carrier detect and the line to become
 581          * free (i.e., not in use by the callout).  While we are in
 582          * this loop, port->port.count is dropped by one, so that
 583          * mxser_close() knows when to free things.  We restore it upon
 584          * exit, either normal or abnormal.
 585          */
 586         retval = 0;
 587         add_wait_queue(&port->port.open_wait, &wait);
 588
 589         spin_lock_irqsave(&port->slock, flags);
 590         if (!tty_hung_up_p(filp))
 591                 port->port.count--;
 592         spin_unlock_irqrestore(&port->slock, flags);
 593         port->port.blocked_open++;
 594         while (1) {
 595                 spin_lock_irqsave(&port->slock, flags);
 596                 outb(inb(port->ioaddr + UART_MCR) |
 597                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 598                 spin_unlock_irqrestore(&port->slock, flags);
 599                 set_current_state(TASK_INTERRUPTIBLE);
 600                 if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
 601                         if (port->port.flags & ASYNC_HUP_NOTIFY)
 602                                 retval = -EAGAIN;
 603                         else
 604                                 retval = -ERESTARTSYS;
 605                         break;
 606                 }
 607                 if (!(port->port.flags & ASYNC_CLOSING) &&
 608                                 (do_clocal ||
 609                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 610                         break;
 611                 if (signal_pending(current)) {
 612                         retval = -ERESTARTSYS;
 613                         break;
 614                 }
 615                 schedule();
 616         }
 617         set_current_state(TASK_RUNNING);
 618         remove_wait_queue(&port->port.open_wait, &wait);
 619         if (!tty_hung_up_p(filp))
 620                 port->port.count++;
 621         port->port.blocked_open--;
 622         if (retval)
 623                 return retval;
 624         port->port.flags |= ASYNC_NORMAL_ACTIVE;
 625         return 0;
 626 }
 627
 628 static int mxser_set_baud(struct mxser_port *info, long newspd)
 629 {
 630         int quot = 0, baud;
 631         unsigned char cval;
 632
 633         if (!info->port.tty || !info->port.tty->termios)
 634                 return -1;
 635
 636         if (!(info->ioaddr))
 637                 return -1;
 638
 639         if (newspd > info->max_baud)
 640                 return -1;
 641
 642         if (newspd == 134) {
 643                 quot = 2 * info->baud_base / 269;
 644                 tty_encode_baud_rate(info->port.tty, 134, 134);
 645         } else if (newspd) {
 646                 quot = info->baud_base / newspd;
 647                 if (quot == 0)
 648                         quot = 1;
 649                 baud = info->baud_base/quot;
 650                 tty_encode_baud_rate(info->port.tty, baud, baud);
 651         } else {
 652                 quot = 0;
 653         }
 654
 655         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 656         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 657
 658         if (quot) {
 659                 info->MCR |= UART_MCR_DTR;
 660                 outb(info->MCR, info->ioaddr + UART_MCR);
 661         } else {
 662                 info->MCR &= ~UART_MCR_DTR;
 663                 outb(info->MCR, info->ioaddr + UART_MCR);
 664                 return 0;
 665         }
 666
 667         cval = inb(info->ioaddr + UART_LCR);
 668
 669         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 670
 671         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 672         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 673         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 674
 675 #ifdef BOTHER
 676         if (C_BAUD(info->port.tty) == BOTHER) {
 677                 quot = info->baud_base % newspd;
 678                 quot *= 8;
 679                 if (quot % newspd > newspd / 2) {
 680                         quot /= newspd;
 681                         quot++;
 682                 } else
 683                         quot /= newspd;
 684
 685                 mxser_set_must_enum_value(info->ioaddr, quot);
 686         } else
 687 #endif
 688                 mxser_set_must_enum_value(info->ioaddr, 0);
 689
 690         return 0;
 691 }
 692
 693 /*
 694  * This routine is called to set the UART divisor registers to match
 695  * the specified baud rate for a serial port.
 696  */
 697 static int mxser_change_speed(struct mxser_port *info,
 698                 struct ktermios *old_termios)
 699 {
 700         unsigned cflag, cval, fcr;
 701         int ret = 0;
 702         unsigned char status;
 703
 704         if (!info->port.tty || !info->port.tty->termios)
 705                 return ret;
 706         cflag = info->port.tty->termios->c_cflag;
 707         if (!(info->ioaddr))
 708                 return ret;
 709
 710         if (mxser_set_baud_method[info->port.tty->index] == 0)
 711                 mxser_set_baud(info, tty_get_baud_rate(info->port.tty));
 712
 713         /* byte size and parity */
 714         switch (cflag & CSIZE) {
 715         case CS5:
 716                 cval = 0x00;
 717                 break;
 718         case CS6:
 719                 cval = 0x01;
 720                 break;
 721         case CS7:
 722                 cval = 0x02;
 723                 break;
 724         case CS8:
 725                 cval = 0x03;
 726                 break;
 727         default:
 728                 cval = 0x00;
 729                 break;          /* too keep GCC shut... */
 730         }
 731         if (cflag & CSTOPB)
 732                 cval |= 0x04;
 733         if (cflag & PARENB)
 734                 cval |= UART_LCR_PARITY;
 735         if (!(cflag & PARODD))
 736                 cval |= UART_LCR_EPAR;
 737         if (cflag & CMSPAR)
 738                 cval |= UART_LCR_SPAR;
 739
 740         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 741                 if (info->board->chip_flag) {
 742                         fcr = UART_FCR_ENABLE_FIFO;
 743                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 744                         mxser_set_must_fifo_value(info);
 745                 } else
 746                         fcr = 0;
 747         } else {
 748                 fcr = UART_FCR_ENABLE_FIFO;
 749                 if (info->board->chip_flag) {
 750                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 751                         mxser_set_must_fifo_value(info);
 752                 } else {
 753                         switch (info->rx_trigger) {
 754                         case 1:
 755                                 fcr |= UART_FCR_TRIGGER_1;
 756                                 break;
 757                         case 4:
 758                                 fcr |= UART_FCR_TRIGGER_4;
 759                                 break;
 760                         case 8:
 761                                 fcr |= UART_FCR_TRIGGER_8;
 762                                 break;
 763                         default:
 764                                 fcr |= UART_FCR_TRIGGER_14;
 765                                 break;
 766                         }
 767                 }
 768         }
 769
 770         /* CTS flow control flag and modem status interrupts */
 771         info->IER &= ~UART_IER_MSI;
 772         info->MCR &= ~UART_MCR_AFE;
 773         if (cflag & CRTSCTS) {
 774                 info->port.flags |= ASYNC_CTS_FLOW;
 775                 info->IER |= UART_IER_MSI;
 776                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 777                         info->MCR |= UART_MCR_AFE;
 778                 } else {
 779                         status = inb(info->ioaddr + UART_MSR);
 780                         if (info->port.tty->hw_stopped) {
 781                                 if (status & UART_MSR_CTS) {
 782                                         info->port.tty->hw_stopped = 0;
 783                                         if (info->type != PORT_16550A &&
 784                                                         !info->board->chip_flag) {
 785                                                 outb(info->IER & ~UART_IER_THRI,
 786                                                         info->ioaddr +
 787                                                         UART_IER);
 788                                                 info->IER |= UART_IER_THRI;
 789                                                 outb(info->IER, info->ioaddr +
 790                                                                 UART_IER);
 791                                         }
 792                                         tty_wakeup(info->port.tty);
 793                                 }
 794                         } else {
 795                                 if (!(status & UART_MSR_CTS)) {
 796                                         info->port.tty->hw_stopped = 1;
 797                                         if ((info->type != PORT_16550A) &&
 798                                                         (!info->board->chip_flag)) {
 799                                                 info->IER &= ~UART_IER_THRI;
 800                                                 outb(info->IER, info->ioaddr +
 801                                                                 UART_IER);
 802                                         }
 803                                 }
 804                         }
 805                 }
 806         } else {
 807                 info->port.flags &= ~ASYNC_CTS_FLOW;
 808         }
 809         outb(info->MCR, info->ioaddr + UART_MCR);
 810         if (cflag & CLOCAL) {
 811                 info->port.flags &= ~ASYNC_CHECK_CD;
 812         } else {
 813                 info->port.flags |= ASYNC_CHECK_CD;
 814                 info->IER |= UART_IER_MSI;
 815         }
 816         outb(info->IER, info->ioaddr + UART_IER);
 817
 818         /*
 819          * Set up parity check flag
 820          */
 821         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 822         if (I_INPCK(info->port.tty))
 823                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 824         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
 825                 info->read_status_mask |= UART_LSR_BI;
 826
 827         info->ignore_status_mask = 0;
 828
 829         if (I_IGNBRK(info->port.tty)) {
 830                 info->ignore_status_mask |= UART_LSR_BI;
 831                 info->read_status_mask |= UART_LSR_BI;
 832                 /*
 833                  * If we're ignore parity and break indicators, ignore
 834                  * overruns too.  (For real raw support).
 835                  */
 836                 if (I_IGNPAR(info->port.tty)) {
 837                         info->ignore_status_mask |=
 838                                                 UART_LSR_OE |
 839                                                 UART_LSR_PE |
 840                                                 UART_LSR_FE;
 841                         info->read_status_mask |=
 842                                                 UART_LSR_OE |
 843                                                 UART_LSR_PE |
 844                                                 UART_LSR_FE;
 845                 }
 846         }
 847         if (info->board->chip_flag) {
 848                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(info->port.tty));
 849                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(info->port.tty));
 850                 if (I_IXON(info->port.tty)) {
 851                         mxser_enable_must_rx_software_flow_control(
 852                                         info->ioaddr);
 853                 } else {
 854                         mxser_disable_must_rx_software_flow_control(
 855                                         info->ioaddr);
 856                 }
 857                 if (I_IXOFF(info->port.tty)) {
 858                         mxser_enable_must_tx_software_flow_control(
 859                                         info->ioaddr);
 860                 } else {
 861                         mxser_disable_must_tx_software_flow_control(
 862                                         info->ioaddr);
 863                 }
 864         }
 865
 866
 867         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 868         outb(cval, info->ioaddr + UART_LCR);
 869
 870         return ret;
 871 }
 872
 873 static void mxser_check_modem_status(struct mxser_port *port, int status)
 874 {
 875         /* update input line counters */
 876         if (status & UART_MSR_TERI)
 877                 port->icount.rng++;
 878         if (status & UART_MSR_DDSR)
 879                 port->icount.dsr++;
 880         if (status & UART_MSR_DDCD)
 881                 port->icount.dcd++;
 882         if (status & UART_MSR_DCTS)
 883                 port->icount.cts++;
 884         port->mon_data.modem_status = status;
 885         wake_up_interruptible(&port->delta_msr_wait);
 886
 887         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 888                 if (status & UART_MSR_DCD)
 889                         wake_up_interruptible(&port->port.open_wait);
 890         }
 891
 892         if (port->port.flags & ASYNC_CTS_FLOW) {
 893                 if (port->port.tty->hw_stopped) {
 894                         if (status & UART_MSR_CTS) {
 895                                 port->port.tty->hw_stopped = 0;
 896
 897                                 if ((port->type != PORT_16550A) &&
 898                                                 (!port->board->chip_flag)) {
 899                                         outb(port->IER & ~UART_IER_THRI,
 900                                                 port->ioaddr + UART_IER);
 901                                         port->IER |= UART_IER_THRI;
 902                                         outb(port->IER, port->ioaddr +
 903                                                         UART_IER);
 904                                 }
 905                                 tty_wakeup(port->port.tty);
 906                         }
 907                 } else {
 908                         if (!(status & UART_MSR_CTS)) {
 909                                 port->port.tty->hw_stopped = 1;
 910                                 if (port->type != PORT_16550A &&
 911                                                 !port->board->chip_flag) {
 912                                         port->IER &= ~UART_IER_THRI;
 913                                         outb(port->IER, port->ioaddr +
 914                                                         UART_IER);
 915                                 }
 916                         }
 917                 }
 918         }
 919 }
 920
 921 static int mxser_startup(struct mxser_port *info)
 922 {
 923         unsigned long page;
 924         unsigned long flags;
 925
 926         page = __get_free_page(GFP_KERNEL);
 927         if (!page)
 928                 return -ENOMEM;
 929
 930         spin_lock_irqsave(&info->slock, flags);
 931
 932         if (info->port.flags & ASYNC_INITIALIZED) {
 933                 free_page(page);
 934                 spin_unlock_irqrestore(&info->slock, flags);
 935                 return 0;
 936         }
 937
 938         if (!info->ioaddr || !info->type) {
 939                 if (info->port.tty)
 940                         set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 941                 free_page(page);
 942                 spin_unlock_irqrestore(&info->slock, flags);
 943                 return 0;
 944         }
 945         if (info->port.xmit_buf)
 946                 free_page(page);
 947         else
 948                 info->port.xmit_buf = (unsigned char *) page;
 949
 950         /*
 951          * Clear the FIFO buffers and disable them
 952          * (they will be reenabled in mxser_change_speed())
 953          */
 954         if (info->board->chip_flag)
 955                 outb((UART_FCR_CLEAR_RCVR |
 956                         UART_FCR_CLEAR_XMIT |
 957                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 958         else
 959                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 960                         info->ioaddr + UART_FCR);
 961
 962         /*
 963          * At this point there's no way the LSR could still be 0xFF;
 964          * if it is, then bail out, because there's likely no UART
 965          * here.
 966          */
 967         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 968                 spin_unlock_irqrestore(&info->slock, flags);
 969                 if (capable(CAP_SYS_ADMIN)) {
 970                         if (info->port.tty)
 971                                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 972                         return 0;
 973                 } else
 974                         return -ENODEV;
 975         }
 976
 977         /*
 978          * Clear the interrupt registers.
 979          */
 980         (void) inb(info->ioaddr + UART_LSR);
 981         (void) inb(info->ioaddr + UART_RX);
 982         (void) inb(info->ioaddr + UART_IIR);
 983         (void) inb(info->ioaddr + UART_MSR);
 984
 985         /*
 986          * Now, initialize the UART
 987          */
 988         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 989         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 990         outb(info->MCR, info->ioaddr + UART_MCR);
 991
 992         /*
 993          * Finally, enable interrupts
 994          */
 995         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 996
 997         if (info->board->chip_flag)
 998                 info->IER |= MOXA_MUST_IER_EGDAI;
 999         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
1000
1001         /*
1002          * And clear the interrupt registers again for luck.
1003          */
1004         (void) inb(info->ioaddr + UART_LSR);
1005         (void) inb(info->ioaddr + UART_RX);
1006         (void) inb(info->ioaddr + UART_IIR);
1007         (void) inb(info->ioaddr + UART_MSR);
1008
1009         if (info->port.tty)
1010                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1011         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1012
1013         /*
1014          * and set the speed of the serial port
1015          */
1016         mxser_change_speed(info, NULL);
1017         info->port.flags |= ASYNC_INITIALIZED;
1018         spin_unlock_irqrestore(&info->slock, flags);
1019
1020         return 0;
1021 }
1022
1023 /*
1024  * This routine will shutdown a serial port; interrupts maybe disabled, and
1025  * DTR is dropped if the hangup on close termio flag is on.
1026  */
1027 static void mxser_shutdown(struct mxser_port *info)
1028 {
1029         unsigned long flags;
1030
1031         if (!(info->port.flags & ASYNC_INITIALIZED))
1032                 return;
1033
1034         spin_lock_irqsave(&info->slock, flags);
1035
1036         /*
1037          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1038          * here so the queue might never be waken up
1039          */
1040         wake_up_interruptible(&info->delta_msr_wait);
1041
1042         /*
1043          * Free the IRQ, if necessary
1044          */
1045         if (info->port.xmit_buf) {
1046                 free_page((unsigned long) info->port.xmit_buf);
1047                 info->port.xmit_buf = NULL;
1048         }
1049
1050         info->IER = 0;
1051         outb(0x00, info->ioaddr + UART_IER);
1052
1053         if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
1054                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1055         outb(info->MCR, info->ioaddr + UART_MCR);
1056
1057         /* clear Rx/Tx FIFO's */
1058         if (info->board->chip_flag)
1059                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1060                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1061                                 info->ioaddr + UART_FCR);
1062         else
1063                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1064                         info->ioaddr + UART_FCR);
1065
1066         /* read data port to reset things */
1067         (void) inb(info->ioaddr + UART_RX);
1068
1069         if (info->port.tty)
1070                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1071
1072         info->port.flags &= ~ASYNC_INITIALIZED;
1073
1074         if (info->board->chip_flag)
1075                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1076
1077         spin_unlock_irqrestore(&info->slock, flags);
1078 }
1079
1080 /*
1081  * This routine is called whenever a serial port is opened.  It
1082  * enables interrupts for a serial port, linking in its async structure into
1083  * the IRQ chain.   It also performs the serial-specific
1084  * initialization for the tty structure.
1085  */
1086 static int mxser_open(struct tty_struct *tty, struct file *filp)
1087 {
1088         struct mxser_port *info;
1089         unsigned long flags;
1090         int retval, line;
1091
1092         line = tty->index;
1093         if (line == MXSER_PORTS)
1094                 return 0;
1095         if (line < 0 || line > MXSER_PORTS)
1096                 return -ENODEV;
1097         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1098         if (!info->ioaddr)
1099                 return -ENODEV;
1100
1101         tty->driver_data = info;
1102         info->port.tty = tty;
1103         /*
1104          * Start up serial port
1105          */
1106         spin_lock_irqsave(&info->slock, flags);
1107         info->port.count++;
1108         spin_unlock_irqrestore(&info->slock, flags);
1109         retval = mxser_startup(info);
1110         if (retval)
1111                 return retval;
1112
1113         retval = mxser_block_til_ready(tty, filp, info);
1114         if (retval)
1115                 return retval;
1116
1117         /* unmark here for very high baud rate (ex. 921600 bps) used */
1118         tty->low_latency = 1;
1119         return 0;
1120 }
1121
1122 static void mxser_flush_buffer(struct tty_struct *tty)
1123 {
1124         struct mxser_port *info = tty->driver_data;
1125         char fcr;
1126         unsigned long flags;
1127
1128
1129         spin_lock_irqsave(&info->slock, flags);
1130         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1131
1132         fcr = inb(info->ioaddr + UART_FCR);
1133         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1134                 info->ioaddr + UART_FCR);
1135         outb(fcr, info->ioaddr + UART_FCR);
1136
1137         spin_unlock_irqrestore(&info->slock, flags);
1138
1139         tty_wakeup(tty);
1140 }
1141
1142
1143 /*
1144  * This routine is called when the serial port gets closed.  First, we
1145  * wait for the last remaining data to be sent.  Then, we unlink its
1146  * async structure from the interrupt chain if necessary, and we free
1147  * that IRQ if nothing is left in the chain.
1148  */
1149 static void mxser_close(struct tty_struct *tty, struct file *filp)
1150 {
1151         struct mxser_port *info = tty->driver_data;
1152
1153         unsigned long timeout;
1154         unsigned long flags;
1155
1156         if (tty->index == MXSER_PORTS)
1157                 return;
1158         if (!info)
1159                 return;
1160
1161         spin_lock_irqsave(&info->slock, flags);
1162
1163         if (tty_hung_up_p(filp)) {
1164                 spin_unlock_irqrestore(&info->slock, flags);
1165                 return;
1166         }
1167         if ((tty->count == 1) && (info->port.count != 1)) {
1168                 /*
1169                  * Uh, oh.  tty->count is 1, which means that the tty
1170                  * structure will be freed.  Info->port.count should always
1171                  * be one in these conditions.  If it's greater than
1172                  * one, we've got real problems, since it means the
1173                  * serial port won't be shutdown.
1174                  */
1175                 printk(KERN_ERR "mxser_close: bad serial port count; "
1176                         "tty->count is 1, info->port.count is %d\n", info->port.count);
1177                 info->port.count = 1;
1178         }
1179         if (--info->port.count < 0) {
1180                 printk(KERN_ERR "mxser_close: bad serial port count for "
1181                         "ttys%d: %d\n", tty->index, info->port.count);
1182                 info->port.count = 0;
1183         }
1184         if (info->port.count) {
1185                 spin_unlock_irqrestore(&info->slock, flags);
1186                 return;
1187         }
1188         info->port.flags |= ASYNC_CLOSING;
1189         spin_unlock_irqrestore(&info->slock, flags);
1190         /*
1191          * Save the termios structure, since this port may have
1192          * separate termios for callout and dialin.
1193          */
1194         if (info->port.flags & ASYNC_NORMAL_ACTIVE)
1195                 info->normal_termios = *tty->termios;
1196         /*
1197          * Now we wait for the transmit buffer to clear; and we notify
1198          * the line discipline to only process XON/XOFF characters.
1199          */
1200         tty->closing = 1;
1201         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1202                 tty_wait_until_sent(tty, info->port.closing_wait);
1203         /*
1204          * At this point we stop accepting input.  To do this, we
1205          * disable the receive line status interrupts, and tell the
1206          * interrupt driver to stop checking the data ready bit in the
1207          * line status register.
1208          */
1209         info->IER &= ~UART_IER_RLSI;
1210         if (info->board->chip_flag)
1211                 info->IER &= ~MOXA_MUST_RECV_ISR;
1212
1213         if (info->port.flags & ASYNC_INITIALIZED) {
1214                 outb(info->IER, info->ioaddr + UART_IER);
1215                 /*
1216                  * Before we drop DTR, make sure the UART transmitter
1217                  * has completely drained; this is especially
1218                  * important if there is a transmit FIFO!
1219                  */
1220                 timeout = jiffies + HZ;
1221                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1222                         schedule_timeout_interruptible(5);
1223                         if (time_after(jiffies, timeout))
1224                                 break;
1225                 }
1226         }
1227         mxser_shutdown(info);
1228
1229         mxser_flush_buffer(tty);
1230         tty_ldisc_flush(tty);
1231
1232         tty->closing = 0;
1233         info->port.tty = NULL;
1234         if (info->port.blocked_open) {
1235                 if (info->port.close_delay)
1236                         schedule_timeout_interruptible(info->port.close_delay);
1237                 wake_up_interruptible(&info->port.open_wait);
1238         }
1239
1240         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1241 }
1242
1243 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1244 {
1245         int c, total = 0;
1246         struct mxser_port *info = tty->driver_data;
1247         unsigned long flags;
1248
1249         if (!info->port.xmit_buf)
1250                 return 0;
1251
1252         while (1) {
1253                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1254                                           SERIAL_XMIT_SIZE - info->xmit_head));
1255                 if (c <= 0)
1256                         break;
1257
1258                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1259                 spin_lock_irqsave(&info->slock, flags);
1260                 info->xmit_head = (info->xmit_head + c) &
1261                                   (SERIAL_XMIT_SIZE - 1);
1262                 info->xmit_cnt += c;
1263                 spin_unlock_irqrestore(&info->slock, flags);
1264
1265                 buf += c;
1266                 count -= c;
1267                 total += c;
1268         }
1269
1270         if (info->xmit_cnt && !tty->stopped) {
1271                 if (!tty->hw_stopped ||
1272                                 (info->type == PORT_16550A) ||
1273                                 (info->board->chip_flag)) {
1274                         spin_lock_irqsave(&info->slock, flags);
1275                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1276                                         UART_IER);
1277                         info->IER |= UART_IER_THRI;
1278                         outb(info->IER, info->ioaddr + UART_IER);
1279                         spin_unlock_irqrestore(&info->slock, flags);
1280                 }
1281         }
1282         return total;
1283 }
1284
1285 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1286 {
1287         struct mxser_port *info = tty->driver_data;
1288         unsigned long flags;
1289
1290         if (!info->port.xmit_buf)
1291                 return 0;
1292
1293         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1294                 return 0;
1295
1296         spin_lock_irqsave(&info->slock, flags);
1297         info->port.xmit_buf[info->xmit_head++] = ch;
1298         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1299         info->xmit_cnt++;
1300         spin_unlock_irqrestore(&info->slock, flags);
1301         if (!tty->stopped) {
1302                 if (!tty->hw_stopped ||
1303                                 (info->type == PORT_16550A) ||
1304                                 info->board->chip_flag) {
1305                         spin_lock_irqsave(&info->slock, flags);
1306                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1307                         info->IER |= UART_IER_THRI;
1308                         outb(info->IER, info->ioaddr + UART_IER);
1309                         spin_unlock_irqrestore(&info->slock, flags);
1310                 }
1311         }
1312         return 1;
1313 }
1314
1315
1316 static void mxser_flush_chars(struct tty_struct *tty)
1317 {
1318         struct mxser_port *info = tty->driver_data;
1319         unsigned long flags;
1320
1321         if (info->xmit_cnt <= 0 ||
1322                         tty->stopped ||
1323                         !info->port.xmit_buf ||
1324                         (tty->hw_stopped &&
1325                          (info->type != PORT_16550A) &&
1326                          (!info->board->chip_flag)
1327                         ))
1328                 return;
1329
1330         spin_lock_irqsave(&info->slock, flags);
1331
1332         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1333         info->IER |= UART_IER_THRI;
1334         outb(info->IER, info->ioaddr + UART_IER);
1335
1336         spin_unlock_irqrestore(&info->slock, flags);
1337 }
1338
1339 static int mxser_write_room(struct tty_struct *tty)
1340 {
1341         struct mxser_port *info = tty->driver_data;
1342         int ret;
1343
1344         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1345         if (ret < 0)
1346                 ret = 0;
1347         return ret;
1348 }
1349
1350 static int mxser_chars_in_buffer(struct tty_struct *tty)
1351 {
1352         struct mxser_port *info = tty->driver_data;
1353         return info->xmit_cnt;
1354 }
1355
1356 /*
1357  * ------------------------------------------------------------
1358  * friends of mxser_ioctl()
1359  * ------------------------------------------------------------
1360  */
1361 static int mxser_get_serial_info(struct mxser_port *info,
1362                 struct serial_struct __user *retinfo)
1363 {
1364         struct serial_struct tmp = {
1365                 .type = info->type,
1366                 .line = info->port.tty->index,
1367                 .port = info->ioaddr,
1368                 .irq = info->board->irq,
1369                 .flags = info->port.flags,
1370                 .baud_base = info->baud_base,
1371                 .close_delay = info->port.close_delay,
1372                 .closing_wait = info->port.closing_wait,
1373                 .custom_divisor = info->custom_divisor,
1374                 .hub6 = 0
1375         };
1376         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1377                 return -EFAULT;
1378         return 0;
1379 }
1380
1381 static int mxser_set_serial_info(struct mxser_port *info,
1382                 struct serial_struct __user *new_info)
1383 {
1384         struct serial_struct new_serial;
1385         speed_t baud;
1386         unsigned long sl_flags;
1387         unsigned int flags;
1388         int retval = 0;
1389
1390         if (!new_info || !info->ioaddr)
1391                 return -ENODEV;
1392         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1393                 return -EFAULT;
1394
1395         if (new_serial.irq != info->board->irq ||
1396                         new_serial.port != info->ioaddr)
1397                 return -EINVAL;
1398
1399         flags = info->port.flags & ASYNC_SPD_MASK;
1400
1401         if (!capable(CAP_SYS_ADMIN)) {
1402                 if ((new_serial.baud_base != info->baud_base) ||
1403                                 (new_serial.close_delay != info->port.close_delay) ||
1404                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1405                         return -EPERM;
1406                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1407                                 (new_serial.flags & ASYNC_USR_MASK));
1408         } else {
1409                 /*
1410                  * OK, past this point, all the error checking has been done.
1411                  * At this point, we start making changes.....
1412                  */
1413                 info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
1414                                 (new_serial.flags & ASYNC_FLAGS));
1415                 info->port.close_delay = new_serial.close_delay * HZ / 100;
1416                 info->port.closing_wait = new_serial.closing_wait * HZ / 100;
1417                 info->port.tty->low_latency =
1418                                 (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1419                 if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1420                                 (new_serial.baud_base != info->baud_base ||
1421                                 new_serial.custom_divisor !=
1422                                 info->custom_divisor)) {
1423                         baud = new_serial.baud_base / new_serial.custom_divisor;
1424                         tty_encode_baud_rate(info->port.tty, baud, baud);
1425                 }
1426         }
1427
1428         info->type = new_serial.type;
1429
1430         process_txrx_fifo(info);
1431
1432         if (info->port.flags & ASYNC_INITIALIZED) {
1433                 if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
1434                         spin_lock_irqsave(&info->slock, sl_flags);
1435                         mxser_change_speed(info, NULL);
1436                         spin_unlock_irqrestore(&info->slock, sl_flags);
1437                 }
1438         } else
1439                 retval = mxser_startup(info);
1440
1441         return retval;
1442 }
1443
1444 /*
1445  * mxser_get_lsr_info - get line status register info
1446  *
1447  * Purpose: Let user call ioctl() to get info when the UART physically
1448  *          is emptied.  On bus types like RS485, the transmitter must
1449  *          release the bus after transmitting. This must be done when
1450  *          the transmit shift register is empty, not be done when the
1451  *          transmit holding register is empty.  This functionality
1452  *          allows an RS485 driver to be written in user space.
1453  */
1454 static int mxser_get_lsr_info(struct mxser_port *info,
1455                 unsigned int __user *value)
1456 {
1457         unsigned char status;
1458         unsigned int result;
1459         unsigned long flags;
1460
1461         spin_lock_irqsave(&info->slock, flags);
1462         status = inb(info->ioaddr + UART_LSR);
1463         spin_unlock_irqrestore(&info->slock, flags);
1464         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1465         return put_user(result, value);
1466 }
1467
1468 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1469 {
1470         struct mxser_port *info = tty->driver_data;
1471         unsigned char control, status;
1472         unsigned long flags;
1473
1474
1475         if (tty->index == MXSER_PORTS)
1476                 return -ENOIOCTLCMD;
1477         if (test_bit(TTY_IO_ERROR, &tty->flags))
1478                 return -EIO;
1479
1480         control = info->MCR;
1481
1482         spin_lock_irqsave(&info->slock, flags);
1483         status = inb(info->ioaddr + UART_MSR);
1484         if (status & UART_MSR_ANY_DELTA)
1485                 mxser_check_modem_status(info, status);
1486         spin_unlock_irqrestore(&info->slock, flags);
1487         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1488                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1489                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1490                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1491                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1492                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1493 }
1494
1495 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1496                 unsigned int set, unsigned int clear)
1497 {
1498         struct mxser_port *info = tty->driver_data;
1499         unsigned long flags;
1500
1501
1502         if (tty->index == MXSER_PORTS)
1503                 return -ENOIOCTLCMD;
1504         if (test_bit(TTY_IO_ERROR, &tty->flags))
1505                 return -EIO;
1506
1507         spin_lock_irqsave(&info->slock, flags);
1508
1509         if (set & TIOCM_RTS)
1510                 info->MCR |= UART_MCR_RTS;
1511         if (set & TIOCM_DTR)
1512                 info->MCR |= UART_MCR_DTR;
1513
1514         if (clear & TIOCM_RTS)
1515                 info->MCR &= ~UART_MCR_RTS;
1516         if (clear & TIOCM_DTR)
1517                 info->MCR &= ~UART_MCR_DTR;
1518
1519         outb(info->MCR, info->ioaddr + UART_MCR);
1520         spin_unlock_irqrestore(&info->slock, flags);
1521         return 0;
1522 }
1523
1524 static int __init mxser_program_mode(int port)
1525 {
1526         int id, i, j, n;
1527
1528         outb(0, port);
1529         outb(0, port);
1530         outb(0, port);
1531         (void)inb(port);
1532         (void)inb(port);
1533         outb(0, port);
1534         (void)inb(port);
1535
1536         id = inb(port + 1) & 0x1F;
1537         if ((id != C168_ASIC_ID) &&
1538                         (id != C104_ASIC_ID) &&
1539                         (id != C102_ASIC_ID) &&
1540                         (id != CI132_ASIC_ID) &&
1541                         (id != CI134_ASIC_ID) &&
1542                         (id != CI104J_ASIC_ID))
1543                 return -1;
1544         for (i = 0, j = 0; i < 4; i++) {
1545                 n = inb(port + 2);
1546                 if (n == 'M') {
1547                         j = 1;
1548                 } else if ((j == 1) && (n == 1)) {
1549                         j = 2;
1550                         break;
1551                 } else
1552                         j = 0;
1553         }
1554         if (j != 2)
1555                 id = -2;
1556         return id;
1557 }
1558
1559 static void __init mxser_normal_mode(int port)
1560 {
1561         int i, n;
1562
1563         outb(0xA5, port + 1);
1564         outb(0x80, port + 3);
1565         outb(12, port + 0);     /* 9600 bps */
1566         outb(0, port + 1);
1567         outb(0x03, port + 3);   /* 8 data bits */
1568         outb(0x13, port + 4);   /* loop back mode */
1569         for (i = 0; i < 16; i++) {
1570                 n = inb(port + 5);
1571                 if ((n & 0x61) == 0x60)
1572                         break;
1573                 if ((n & 1) == 1)
1574                         (void)inb(port);
1575         }
1576         outb(0x00, port + 4);
1577 }
1578
1579 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1580 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1581 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1582 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1583 #define EN_CCMD         0x000   /* Chip's command register     */
1584 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1585 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1586 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1587 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1588 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1589 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1590 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1591 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1592 static int __init mxser_read_register(int port, unsigned short *regs)
1593 {
1594         int i, k, value, id;
1595         unsigned int j;
1596
1597         id = mxser_program_mode(port);
1598         if (id < 0)
1599                 return id;
1600         for (i = 0; i < 14; i++) {
1601                 k = (i & 0x3F) | 0x180;
1602                 for (j = 0x100; j > 0; j >>= 1) {
1603                         outb(CHIP_CS, port);
1604                         if (k & j) {
1605                                 outb(CHIP_CS | CHIP_DO, port);
1606                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1607                         } else {
1608                                 outb(CHIP_CS, port);
1609                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1610                         }
1611                 }
1612                 (void)inb(port);
1613                 value = 0;
1614                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1615                         outb(CHIP_CS, port);
1616                         outb(CHIP_CS | CHIP_SK, port);
1617                         if (inb(port) & CHIP_DI)
1618                                 value |= j;
1619                 }
1620                 regs[i] = value;
1621                 outb(0, port);
1622         }
1623         mxser_normal_mode(port);
1624         return id;
1625 }
1626
1627 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1628 {
1629         struct mxser_port *port;
1630         int result, status;
1631         unsigned int i, j;
1632         int ret = 0;
1633
1634         switch (cmd) {
1635         case MOXA_GET_MAJOR:
1636                 printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl %x, fix "
1637                                 "your userspace\n", current->comm, cmd);
1638                 return put_user(ttymajor, (int __user *)argp);
1639
1640         case MOXA_CHKPORTENABLE:
1641                 result = 0;
1642                 lock_kernel();
1643                 for (i = 0; i < MXSER_BOARDS; i++)
1644                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1645                                 if (mxser_boards[i].ports[j].ioaddr)
1646                                         result |= (1 << i);
1647                 unlock_kernel();
1648                 return put_user(result, (unsigned long __user *)argp);
1649         case MOXA_GETDATACOUNT:
1650                 lock_kernel();
1651                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1652                         ret = -EFAULT;
1653                 unlock_kernel();
1654                 return ret;
1655         case MOXA_GETMSTATUS:
1656                 lock_kernel();
1657                 for (i = 0; i < MXSER_BOARDS; i++)
1658                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1659                                 port = &mxser_boards[i].ports[j];
1660
1661                                 GMStatus[i].ri = 0;
1662                                 if (!port->ioaddr) {
1663                                         GMStatus[i].dcd = 0;
1664                                         GMStatus[i].dsr = 0;
1665                                         GMStatus[i].cts = 0;
1666                                         continue;
1667                                 }
1668
1669                                 if (!port->port.tty || !port->port.tty->termios)
1670                                         GMStatus[i].cflag =
1671                                                 port->normal_termios.c_cflag;
1672                                 else
1673                                         GMStatus[i].cflag =
1674                                                 port->port.tty->termios->c_cflag;
1675
1676                                 status = inb(port->ioaddr + UART_MSR);
1677                                 if (status & 0x80 /*UART_MSR_DCD */ )
1678                                         GMStatus[i].dcd = 1;
1679                                 else
1680                                         GMStatus[i].dcd = 0;
1681
1682                                 if (status & 0x20 /*UART_MSR_DSR */ )
1683                                         GMStatus[i].dsr = 1;
1684                                 else
1685                                         GMStatus[i].dsr = 0;
1686
1687
1688                                 if (status & 0x10 /*UART_MSR_CTS */ )
1689                                         GMStatus[i].cts = 1;
1690                                 else
1691                                         GMStatus[i].cts = 0;
1692                         }
1693                 unlock_kernel();
1694                 if (copy_to_user(argp, GMStatus,
1695                                 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1696                         return -EFAULT;
1697                 return 0;
1698         case MOXA_ASPP_MON_EXT: {
1699                 int p, shiftbit;
1700                 unsigned long opmode;
1701                 unsigned cflag, iflag;
1702
1703                 lock_kernel();
1704                 for (i = 0; i < MXSER_BOARDS; i++) {
1705                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1706                                 port = &mxser_boards[i].ports[j];
1707                                 if (!port->ioaddr)
1708                                         continue;
1709
1710                                 status = mxser_get_msr(port->ioaddr, 0, i);
1711
1712                                 if (status & UART_MSR_TERI)
1713                                         port->icount.rng++;
1714                                 if (status & UART_MSR_DDSR)
1715                                         port->icount.dsr++;
1716                                 if (status & UART_MSR_DDCD)
1717                                         port->icount.dcd++;
1718                                 if (status & UART_MSR_DCTS)
1719                                         port->icount.cts++;
1720
1721                                 port->mon_data.modem_status = status;
1722                                 mon_data_ext.rx_cnt[i] = port->mon_data.rxcnt;
1723                                 mon_data_ext.tx_cnt[i] = port->mon_data.txcnt;
1724                                 mon_data_ext.up_rxcnt[i] =
1725                                         port->mon_data.up_rxcnt;
1726                                 mon_data_ext.up_txcnt[i] =
1727                                         port->mon_data.up_txcnt;
1728                                 mon_data_ext.modem_status[i] =
1729                                         port->mon_data.modem_status;
1730                                 mon_data_ext.baudrate[i] =
1731                                         tty_get_baud_rate(port->port.tty);
1732
1733                                 if (!port->port.tty || !port->port.tty->termios) {
1734                                         cflag = port->normal_termios.c_cflag;
1735                                         iflag = port->normal_termios.c_iflag;
1736                                 } else {
1737                                         cflag = port->port.tty->termios->c_cflag;
1738                                         iflag = port->port.tty->termios->c_iflag;
1739                                 }
1740
1741                                 mon_data_ext.databits[i] = cflag & CSIZE;
1742
1743                                 mon_data_ext.stopbits[i] = cflag & CSTOPB;
1744
1745                                 mon_data_ext.parity[i] =
1746                                         cflag & (PARENB | PARODD | CMSPAR);
1747
1748                                 mon_data_ext.flowctrl[i] = 0x00;
1749
1750                                 if (cflag & CRTSCTS)
1751                                         mon_data_ext.flowctrl[i] |= 0x03;
1752
1753                                 if (iflag & (IXON | IXOFF))
1754                                         mon_data_ext.flowctrl[i] |= 0x0C;
1755
1756                                 if (port->type == PORT_16550A)
1757                                         mon_data_ext.fifo[i] = 1;
1758                                 else
1759                                         mon_data_ext.fifo[i] = 0;
1760
1761                                 p = i % 4;
1762                                 shiftbit = p * 2;
1763                                 opmode = inb(port->opmode_ioaddr) >> shiftbit;
1764                                 opmode &= OP_MODE_MASK;
1765
1766                                 mon_data_ext.iftype[i] = opmode;
1767
1768                         }
1769                 }
1770                 unlock_kernel();
1771                 if (copy_to_user(argp, &mon_data_ext,
1772                                         sizeof(mon_data_ext)))
1773                         return -EFAULT;
1774                 return 0;
1775         }
1776         default:
1777                 return -ENOIOCTLCMD;
1778         }
1779         return 0;
1780 }
1781
1782 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1783                 struct async_icount *cprev)
1784 {
1785         struct async_icount cnow;
1786         unsigned long flags;
1787         int ret;
1788
1789         spin_lock_irqsave(&info->slock, flags);
1790         cnow = info->icount;    /* atomic copy */
1791         spin_unlock_irqrestore(&info->slock, flags);
1792
1793         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1794                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1795                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1796                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1797
1798         *cprev = cnow;
1799
1800         return ret;
1801 }
1802
1803 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1804                 unsigned int cmd, unsigned long arg)
1805 {
1806         struct mxser_port *info = tty->driver_data;
1807         struct async_icount cnow;
1808         unsigned long flags;
1809         void __user *argp = (void __user *)arg;
1810         int retval;
1811
1812         if (tty->index == MXSER_PORTS)
1813                 return mxser_ioctl_special(cmd, argp);
1814
1815         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1816                 int p;
1817                 unsigned long opmode;
1818                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1819                 int shiftbit;
1820                 unsigned char val, mask;
1821
1822                 p = tty->index % 4;
1823                 if (cmd == MOXA_SET_OP_MODE) {
1824                         if (get_user(opmode, (int __user *) argp))
1825                                 return -EFAULT;
1826                         if (opmode != RS232_MODE &&
1827                                         opmode != RS485_2WIRE_MODE &&
1828                                         opmode != RS422_MODE &&
1829                                         opmode != RS485_4WIRE_MODE)
1830                                 return -EFAULT;
1831                         lock_kernel();
1832                         mask = ModeMask[p];
1833                         shiftbit = p * 2;
1834                         val = inb(info->opmode_ioaddr);
1835                         val &= mask;
1836                         val |= (opmode << shiftbit);
1837                         outb(val, info->opmode_ioaddr);
1838                         unlock_kernel();
1839                 } else {
1840                         lock_kernel();
1841                         shiftbit = p * 2;
1842                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1843                         opmode &= OP_MODE_MASK;
1844                         unlock_kernel();
1845                         if (put_user(opmode, (int __user *)argp))
1846                                 return -EFAULT;
1847                 }
1848                 return 0;
1849         }
1850
1851         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1852                         test_bit(TTY_IO_ERROR, &tty->flags))
1853                 return -EIO;
1854
1855         switch (cmd) {
1856         case TIOCGSERIAL:
1857                 lock_kernel();
1858                 retval = mxser_get_serial_info(info, argp);
1859                 unlock_kernel();
1860                 return retval;
1861         case TIOCSSERIAL:
1862                 lock_kernel();
1863                 retval = mxser_set_serial_info(info, argp);
1864                 unlock_kernel();
1865                 return retval;
1866         case TIOCSERGETLSR:     /* Get line status register */
1867                 return  mxser_get_lsr_info(info, argp);
1868                 /*
1869                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1870                  * - mask passed in arg for lines of interest
1871                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1872                  * Caller should use TIOCGICOUNT to see which one it was
1873                  */
1874         case TIOCMIWAIT:
1875                 spin_lock_irqsave(&info->slock, flags);
1876                 cnow = info->icount;    /* note the counters on entry */
1877                 spin_unlock_irqrestore(&info->slock, flags);
1878
1879                 return wait_event_interruptible(info->delta_msr_wait,
1880                                 mxser_cflags_changed(info, arg, &cnow));
1881         /*
1882          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1883          * Return: write counters to the user passed counter struct
1884          * NB: both 1->0 and 0->1 transitions are counted except for
1885          *     RI where only 0->1 is counted.
1886          */
1887         case TIOCGICOUNT: {
1888                 struct serial_icounter_struct icnt = { 0 };
1889                 spin_lock_irqsave(&info->slock, flags);
1890                 cnow = info->icount;
1891                 spin_unlock_irqrestore(&info->slock, flags);
1892
1893                 icnt.frame = cnow.frame;
1894                 icnt.brk = cnow.brk;
1895                 icnt.overrun = cnow.overrun;
1896                 icnt.buf_overrun = cnow.buf_overrun;
1897                 icnt.parity = cnow.parity;
1898                 icnt.rx = cnow.rx;
1899                 icnt.tx = cnow.tx;
1900                 icnt.cts = cnow.cts;
1901                 icnt.dsr = cnow.dsr;
1902                 icnt.rng = cnow.rng;
1903                 icnt.dcd = cnow.dcd;
1904
1905                 return copy_to_user(argp, &icnt, sizeof(icnt)) ? -EFAULT : 0;
1906         }
1907         case MOXA_HighSpeedOn:
1908                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1909         case MOXA_SDS_RSTICOUNTER:
1910                 lock_kernel();
1911                 info->mon_data.rxcnt = 0;
1912                 info->mon_data.txcnt = 0;
1913                 unlock_kernel();
1914                 return 0;
1915
1916         case MOXA_ASPP_OQUEUE:{
1917                 int len, lsr;
1918
1919                 lock_kernel();
1920                 len = mxser_chars_in_buffer(tty);
1921                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1922                 len += (lsr ? 0 : 1);
1923                 unlock_kernel();
1924
1925                 return put_user(len, (int __user *)argp);
1926         }
1927         case MOXA_ASPP_MON: {
1928                 int mcr, status;
1929
1930                 lock_kernel();
1931                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1932                 mxser_check_modem_status(info, status);
1933
1934                 mcr = inb(info->ioaddr + UART_MCR);
1935                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1936                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1937                 else
1938                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1939
1940                 if (mcr & MOXA_MUST_MCR_TX_XON)
1941                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1942                 else
1943                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1944
1945                 if (info->port.tty->hw_stopped)
1946                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1947                 else
1948                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1949                 unlock_kernel();
1950                 if (copy_to_user(argp, &info->mon_data,
1951                                 sizeof(struct mxser_mon)))
1952                         return -EFAULT;
1953
1954                 return 0;
1955         }
1956         case MOXA_ASPP_LSTATUS: {
1957                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1958                         return -EFAULT;
1959
1960                 info->err_shadow = 0;
1961                 return 0;
1962         }
1963         case MOXA_SET_BAUD_METHOD: {
1964                 int method;
1965
1966                 if (get_user(method, (int __user *)argp))
1967                         return -EFAULT;
1968                 mxser_set_baud_method[tty->index] = method;
1969                 return put_user(method, (int __user *)argp);
1970         }
1971         default:
1972                 return -ENOIOCTLCMD;
1973         }
1974         return 0;
1975 }
1976
1977 static void mxser_stoprx(struct tty_struct *tty)
1978 {
1979         struct mxser_port *info = tty->driver_data;
1980
1981         info->ldisc_stop_rx = 1;
1982         if (I_IXOFF(tty)) {
1983                 if (info->board->chip_flag) {
1984                         info->IER &= ~MOXA_MUST_RECV_ISR;
1985                         outb(info->IER, info->ioaddr + UART_IER);
1986                 } else {
1987                         info->x_char = STOP_CHAR(tty);
1988                         outb(0, info->ioaddr + UART_IER);
1989                         info->IER |= UART_IER_THRI;
1990                         outb(info->IER, info->ioaddr + UART_IER);
1991                 }
1992         }
1993
1994         if (info->port.tty->termios->c_cflag & CRTSCTS) {
1995                 info->MCR &= ~UART_MCR_RTS;
1996                 outb(info->MCR, info->ioaddr + UART_MCR);
1997         }
1998 }
1999
2000 /*
2001  * This routine is called by the upper-layer tty layer to signal that
2002  * incoming characters should be throttled.
2003  */
2004 static void mxser_throttle(struct tty_struct *tty)
2005 {
2006         mxser_stoprx(tty);
2007 }
2008
2009 static void mxser_unthrottle(struct tty_struct *tty)
2010 {
2011         struct mxser_port *info = tty->driver_data;
2012
2013         /* startrx */
2014         info->ldisc_stop_rx = 0;
2015         if (I_IXOFF(tty)) {
2016                 if (info->x_char)
2017                         info->x_char = 0;
2018                 else {
2019                         if (info->board->chip_flag) {
2020                                 info->IER |= MOXA_MUST_RECV_ISR;
2021                                 outb(info->IER, info->ioaddr + UART_IER);
2022                         } else {
2023                                 info->x_char = START_CHAR(tty);
2024                                 outb(0, info->ioaddr + UART_IER);
2025                                 info->IER |= UART_IER_THRI;
2026                                 outb(info->IER, info->ioaddr + UART_IER);
2027                         }
2028                 }
2029         }
2030
2031         if (info->port.tty->termios->c_cflag & CRTSCTS) {
2032                 info->MCR |= UART_MCR_RTS;
2033                 outb(info->MCR, info->ioaddr + UART_MCR);
2034         }
2035 }
2036
2037 /*
2038  * mxser_stop() and mxser_start()
2039  *
2040  * This routines are called before setting or resetting tty->stopped.
2041  * They enable or disable transmitter interrupts, as necessary.
2042  */
2043 static void mxser_stop(struct tty_struct *tty)
2044 {
2045         struct mxser_port *info = tty->driver_data;
2046         unsigned long flags;
2047
2048         spin_lock_irqsave(&info->slock, flags);
2049         if (info->IER & UART_IER_THRI) {
2050                 info->IER &= ~UART_IER_THRI;
2051                 outb(info->IER, info->ioaddr + UART_IER);
2052         }
2053         spin_unlock_irqrestore(&info->slock, flags);
2054 }
2055
2056 static void mxser_start(struct tty_struct *tty)
2057 {
2058         struct mxser_port *info = tty->driver_data;
2059         unsigned long flags;
2060
2061         spin_lock_irqsave(&info->slock, flags);
2062         if (info->xmit_cnt && info->port.xmit_buf) {
2063                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2064                 info->IER |= UART_IER_THRI;
2065                 outb(info->IER, info->ioaddr + UART_IER);
2066         }
2067         spin_unlock_irqrestore(&info->slock, flags);
2068 }
2069
2070 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2071 {
2072         struct mxser_port *info = tty->driver_data;
2073         unsigned long flags;
2074
2075         spin_lock_irqsave(&info->slock, flags);
2076         mxser_change_speed(info, old_termios);
2077         spin_unlock_irqrestore(&info->slock, flags);
2078
2079         if ((old_termios->c_cflag & CRTSCTS) &&
2080                         !(tty->termios->c_cflag & CRTSCTS)) {
2081                 tty->hw_stopped = 0;
2082                 mxser_start(tty);
2083         }
2084
2085         /* Handle sw stopped */
2086         if ((old_termios->c_iflag & IXON) &&
2087                         !(tty->termios->c_iflag & IXON)) {
2088                 tty->stopped = 0;
2089
2090                 if (info->board->chip_flag) {
2091                         spin_lock_irqsave(&info->slock, flags);
2092                         mxser_disable_must_rx_software_flow_control(
2093                                         info->ioaddr);
2094                         spin_unlock_irqrestore(&info->slock, flags);
2095                 }
2096
2097                 mxser_start(tty);
2098         }
2099 }
2100
2101 /*
2102  * mxser_wait_until_sent() --- wait until the transmitter is empty
2103  */
2104 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2105 {
2106         struct mxser_port *info = tty->driver_data;
2107         unsigned long orig_jiffies, char_time;
2108         int lsr;
2109
2110         if (info->type == PORT_UNKNOWN)
2111                 return;
2112
2113         if (info->xmit_fifo_size == 0)
2114                 return;         /* Just in case.... */
2115
2116         orig_jiffies = jiffies;
2117         /*
2118          * Set the check interval to be 1/5 of the estimated time to
2119          * send a single character, and make it at least 1.  The check
2120          * interval should also be less than the timeout.
2121          *
2122          * Note: we have to use pretty tight timings here to satisfy
2123          * the NIST-PCTS.
2124          */
2125         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2126         char_time = char_time / 5;
2127         if (char_time == 0)
2128                 char_time = 1;
2129         if (timeout && timeout < char_time)
2130                 char_time = timeout;
2131         /*
2132          * If the transmitter hasn't cleared in twice the approximate
2133          * amount of time to send the entire FIFO, it probably won't
2134          * ever clear.  This assumes the UART isn't doing flow
2135          * control, which is currently the case.  Hence, if it ever
2136          * takes longer than info->timeout, this is probably due to a
2137          * UART bug of some kind.  So, we clamp the timeout parameter at
2138          * 2*info->timeout.
2139          */
2140         if (!timeout || timeout > 2 * info->timeout)
2141                 timeout = 2 * info->timeout;
2142 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2143         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2144                 timeout, char_time);
2145         printk("jiff=%lu...", jiffies);
2146 #endif
2147         lock_kernel();
2148         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2149 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2150                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2151 #endif
2152                 schedule_timeout_interruptible(char_time);
2153                 if (signal_pending(current))
2154                         break;
2155                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2156                         break;
2157         }
2158         set_current_state(TASK_RUNNING);
2159         unlock_kernel();
2160
2161 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2162         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2163 #endif
2164 }
2165
2166 /*
2167  * This routine is called by tty_hangup() when a hangup is signaled.
2168  */
2169 static void mxser_hangup(struct tty_struct *tty)
2170 {
2171         struct mxser_port *info = tty->driver_data;
2172
2173         mxser_flush_buffer(tty);
2174         mxser_shutdown(info);
2175         info->port.count = 0;
2176         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2177         info->port.tty = NULL;
2178         wake_up_interruptible(&info->port.open_wait);
2179 }
2180
2181 /*
2182  * mxser_rs_break() --- routine which turns the break handling on or off
2183  */
2184 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2185 {
2186         struct mxser_port *info = tty->driver_data;
2187         unsigned long flags;
2188
2189         spin_lock_irqsave(&info->slock, flags);
2190         if (break_state == -1)
2191                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2192                         info->ioaddr + UART_LCR);
2193         else
2194                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2195                         info->ioaddr + UART_LCR);
2196         spin_unlock_irqrestore(&info->slock, flags);
2197         return 0;
2198 }
2199
2200 static void mxser_receive_chars(struct mxser_port *port, int *status)
2201 {
2202         struct tty_struct *tty = port->port.tty;
2203         unsigned char ch, gdl;
2204         int ignored = 0;
2205         int cnt = 0;
2206         int recv_room;
2207         int max = 256;
2208
2209         recv_room = tty->receive_room;
2210         if ((recv_room == 0) && (!port->ldisc_stop_rx))
2211                 mxser_stoprx(tty);
2212
2213         if (port->board->chip_flag != MOXA_OTHER_UART) {
2214
2215                 if (*status & UART_LSR_SPECIAL)
2216                         goto intr_old;
2217                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2218                                 (*status & MOXA_MUST_LSR_RERR))
2219                         goto intr_old;
2220                 if (*status & MOXA_MUST_LSR_RERR)
2221                         goto intr_old;
2222
2223                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2224
2225                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2226                         gdl &= MOXA_MUST_GDL_MASK;
2227                 if (gdl >= recv_room) {
2228                         if (!port->ldisc_stop_rx)
2229                                 mxser_stoprx(tty);
2230                 }
2231                 while (gdl--) {
2232                         ch = inb(port->ioaddr + UART_RX);
2233                         tty_insert_flip_char(tty, ch, 0);
2234                         cnt++;
2235                 }
2236                 goto end_intr;
2237         }
2238 intr_old:
2239
2240         do {
2241                 if (max-- < 0)
2242                         break;
2243
2244                 ch = inb(port->ioaddr + UART_RX);
2245                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2246                         outb(0x23, port->ioaddr + UART_FCR);
2247                 *status &= port->read_status_mask;
2248                 if (*status & port->ignore_status_mask) {
2249                         if (++ignored > 100)
2250                                 break;
2251                 } else {
2252                         char flag = 0;
2253                         if (*status & UART_LSR_SPECIAL) {
2254                                 if (*status & UART_LSR_BI) {
2255                                         flag = TTY_BREAK;
2256                                         port->icount.brk++;
2257
2258                                         if (port->port.flags & ASYNC_SAK)
2259                                                 do_SAK(tty);
2260                                 } else if (*status & UART_LSR_PE) {
2261                                         flag = TTY_PARITY;
2262                                         port->icount.parity++;
2263                                 } else if (*status & UART_LSR_FE) {
2264                                         flag = TTY_FRAME;
2265                                         port->icount.frame++;
2266                                 } else if (*status & UART_LSR_OE) {
2267                                         flag = TTY_OVERRUN;
2268                                         port->icount.overrun++;
2269                                 } else
2270                                         flag = TTY_BREAK;
2271                         }
2272                         tty_insert_flip_char(tty, ch, flag);
2273                         cnt++;
2274                         if (cnt >= recv_room) {
2275                                 if (!port->ldisc_stop_rx)
2276                                         mxser_stoprx(tty);
2277                                 break;
2278                         }
2279
2280                 }
2281
2282                 if (port->board->chip_flag)
2283                         break;
2284
2285                 *status = inb(port->ioaddr + UART_LSR);
2286         } while (*status & UART_LSR_DR);
2287
2288 end_intr:
2289         mxvar_log.rxcnt[port->port.tty->index] += cnt;
2290         port->mon_data.rxcnt += cnt;
2291         port->mon_data.up_rxcnt += cnt;
2292
2293         /*
2294          * We are called from an interrupt context with &port->slock
2295          * being held. Drop it temporarily in order to prevent
2296          * recursive locking.
2297          */
2298         spin_unlock(&port->slock);
2299         tty_flip_buffer_push(tty);
2300         spin_lock(&port->slock);
2301 }
2302
2303 static void mxser_transmit_chars(struct mxser_port *port)
2304 {
2305         int count, cnt;
2306
2307         if (port->x_char) {
2308                 outb(port->x_char, port->ioaddr + UART_TX);
2309                 port->x_char = 0;
2310                 mxvar_log.txcnt[port->port.tty->index]++;
2311                 port->mon_data.txcnt++;
2312                 port->mon_data.up_txcnt++;
2313                 port->icount.tx++;
2314                 return;
2315         }
2316
2317         if (port->port.xmit_buf == NULL)
2318                 return;
2319
2320         if ((port->xmit_cnt <= 0) || port->port.tty->stopped ||
2321                         (port->port.tty->hw_stopped &&
2322                         (port->type != PORT_16550A) &&
2323                         (!port->board->chip_flag))) {
2324                 port->IER &= ~UART_IER_THRI;
2325                 outb(port->IER, port->ioaddr + UART_IER);
2326                 return;
2327         }
2328
2329         cnt = port->xmit_cnt;
2330         count = port->xmit_fifo_size;
2331         do {
2332                 outb(port->port.xmit_buf[port->xmit_tail++],
2333                         port->ioaddr + UART_TX);
2334                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2335                 if (--port->xmit_cnt <= 0)
2336                         break;
2337         } while (--count > 0);
2338         mxvar_log.txcnt[port->port.tty->index] += (cnt - port->xmit_cnt);
2339
2340         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2341         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2342         port->icount.tx += (cnt - port->xmit_cnt);
2343
2344         if (port->xmit_cnt < WAKEUP_CHARS)
2345                 tty_wakeup(port->port.tty);
2346
2347         if (port->xmit_cnt <= 0) {
2348                 port->IER &= ~UART_IER_THRI;
2349                 outb(port->IER, port->ioaddr + UART_IER);
2350         }
2351 }
2352
2353 /*
2354  * This is the serial driver's generic interrupt routine
2355  */
2356 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2357 {
2358         int status, iir, i;
2359         struct mxser_board *brd = NULL;
2360         struct mxser_port *port;
2361         int max, irqbits, bits, msr;
2362         unsigned int int_cnt, pass_counter = 0;
2363         int handled = IRQ_NONE;
2364
2365         for (i = 0; i < MXSER_BOARDS; i++)
2366                 if (dev_id == &mxser_boards[i]) {
2367                         brd = dev_id;
2368                         break;
2369                 }
2370
2371         if (i == MXSER_BOARDS)
2372                 goto irq_stop;
2373         if (brd == NULL)
2374                 goto irq_stop;
2375         max = brd->info->nports;
2376         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2377                 irqbits = inb(brd->vector) & brd->vector_mask;
2378                 if (irqbits == brd->vector_mask)
2379                         break;
2380
2381                 handled = IRQ_HANDLED;
2382                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2383                         if (irqbits == brd->vector_mask)
2384                                 break;
2385                         if (bits & irqbits)
2386                                 continue;
2387                         port = &brd->ports[i];
2388
2389                         int_cnt = 0;
2390                         spin_lock(&port->slock);
2391                         do {
2392                                 iir = inb(port->ioaddr + UART_IIR);
2393                                 if (iir & UART_IIR_NO_INT)
2394                                         break;
2395                                 iir &= MOXA_MUST_IIR_MASK;
2396                                 if (!port->port.tty ||
2397                                                 (port->port.flags & ASYNC_CLOSING) ||
2398                                                 !(port->port.flags &
2399                                                         ASYNC_INITIALIZED)) {
2400                                         status = inb(port->ioaddr + UART_LSR);
2401                                         outb(0x27, port->ioaddr + UART_FCR);
2402                                         inb(port->ioaddr + UART_MSR);
2403                                         break;
2404                                 }
2405
2406                                 status = inb(port->ioaddr + UART_LSR);
2407
2408                                 if (status & UART_LSR_PE)
2409                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2410                                 if (status & UART_LSR_FE)
2411                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2412                                 if (status & UART_LSR_OE)
2413                                         port->err_shadow |=
2414                                                 NPPI_NOTIFY_HW_OVERRUN;
2415                                 if (status & UART_LSR_BI)
2416                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2417
2418                                 if (port->board->chip_flag) {
2419                                         if (iir == MOXA_MUST_IIR_GDA ||
2420                                             iir == MOXA_MUST_IIR_RDA ||
2421                                             iir == MOXA_MUST_IIR_RTO ||
2422                                             iir == MOXA_MUST_IIR_LSR)
2423                                                 mxser_receive_chars(port,
2424                                                                 &status);
2425
2426                                 } else {
2427                                         status &= port->read_status_mask;
2428                                         if (status & UART_LSR_DR)
2429                                                 mxser_receive_chars(port,
2430                                                                 &status);
2431                                 }
2432                                 msr = inb(port->ioaddr + UART_MSR);
2433                                 if (msr & UART_MSR_ANY_DELTA)
2434                                         mxser_check_modem_status(port, msr);
2435
2436                                 if (port->board->chip_flag) {
2437                                         if (iir == 0x02 && (status &
2438                                                                 UART_LSR_THRE))
2439                                                 mxser_transmit_chars(port);
2440                                 } else {
2441                                         if (status & UART_LSR_THRE)
2442                                                 mxser_transmit_chars(port);
2443                                 }
2444                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2445                         spin_unlock(&port->slock);
2446                 }
2447         }
2448
2449 irq_stop:
2450         return handled;
2451 }
2452
2453 static const struct tty_operations mxser_ops = {
2454         .open = mxser_open,
2455         .close = mxser_close,
2456         .write = mxser_write,
2457         .put_char = mxser_put_char,
2458         .flush_chars = mxser_flush_chars,
2459         .write_room = mxser_write_room,
2460         .chars_in_buffer = mxser_chars_in_buffer,
2461         .flush_buffer = mxser_flush_buffer,
2462         .ioctl = mxser_ioctl,
2463         .throttle = mxser_throttle,
2464         .unthrottle = mxser_unthrottle,
2465         .set_termios = mxser_set_termios,
2466         .stop = mxser_stop,
2467         .start = mxser_start,
2468         .hangup = mxser_hangup,
2469         .break_ctl = mxser_rs_break,
2470         .wait_until_sent = mxser_wait_until_sent,
2471         .tiocmget = mxser_tiocmget,
2472         .tiocmset = mxser_tiocmset,
2473 };
2474
2475 /*
2476  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2477  */
2478
2479 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2480                 unsigned int irq)
2481 {
2482         if (irq)
2483                 free_irq(brd->irq, brd);
2484         if (pdev != NULL) {     /* PCI */
2485 #ifdef CONFIG_PCI
2486                 pci_release_region(pdev, 2);
2487                 pci_release_region(pdev, 3);
2488 #endif
2489         } else {
2490                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2491                 release_region(brd->vector, 1);
2492         }
2493 }
2494
2495 static int __devinit mxser_initbrd(struct mxser_board *brd,
2496                 struct pci_dev *pdev)
2497 {
2498         struct mxser_port *info;
2499         unsigned int i;
2500         int retval;
2501
2502         printk(KERN_INFO "max. baud rate = %d bps.\n", brd->ports[0].max_baud);
2503
2504         for (i = 0; i < brd->info->nports; i++) {
2505                 info = &brd->ports[i];
2506                 tty_port_init(&info->port);
2507                 info->board = brd;
2508                 info->stop_rx = 0;
2509                 info->ldisc_stop_rx = 0;
2510
2511                 /* Enhance mode enabled here */
2512                 if (brd->chip_flag != MOXA_OTHER_UART)
2513                         mxser_enable_must_enchance_mode(info->ioaddr);
2514
2515                 info->port.flags = ASYNC_SHARE_IRQ;
2516                 info->type = brd->uart_type;
2517
2518                 process_txrx_fifo(info);
2519
2520                 info->custom_divisor = info->baud_base * 16;
2521                 info->port.close_delay = 5 * HZ / 10;
2522                 info->port.closing_wait = 30 * HZ;
2523                 info->normal_termios = mxvar_sdriver->init_termios;
2524                 init_waitqueue_head(&info->delta_msr_wait);
2525                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2526                 info->err_shadow = 0;
2527                 spin_lock_init(&info->slock);
2528
2529                 /* before set INT ISR, disable all int */
2530                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2531                         info->ioaddr + UART_IER);
2532         }
2533
2534         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2535                         brd);
2536         if (retval) {
2537                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2538                         "conflict with another device.\n",
2539                         brd->info->name, brd->irq);
2540                 /* We hold resources, we need to release them. */
2541                 mxser_release_res(brd, pdev, 0);
2542         }
2543         return retval;
2544 }
2545
2546 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2547 {
2548         int id, i, bits;
2549         unsigned short regs[16], irq;
2550         unsigned char scratch, scratch2;
2551
2552         brd->chip_flag = MOXA_OTHER_UART;
2553
2554         id = mxser_read_register(cap, regs);
2555         switch (id) {
2556         case C168_ASIC_ID:
2557                 brd->info = &mxser_cards[0];
2558                 break;
2559         case C104_ASIC_ID:
2560                 brd->info = &mxser_cards[1];
2561                 break;
2562         case CI104J_ASIC_ID:
2563                 brd->info = &mxser_cards[2];
2564                 break;
2565         case C102_ASIC_ID:
2566                 brd->info = &mxser_cards[5];
2567                 break;
2568         case CI132_ASIC_ID:
2569                 brd->info = &mxser_cards[6];
2570                 break;
2571         case CI134_ASIC_ID:
2572                 brd->info = &mxser_cards[7];
2573                 break;
2574         default:
2575                 return 0;
2576         }
2577
2578         irq = 0;
2579         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2580            Flag-hack checks if configuration should be read as 2-port here. */
2581         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2582                 irq = regs[9] & 0xF000;
2583                 irq = irq | (irq >> 4);
2584                 if (irq != (regs[9] & 0xFF00))
2585                         return MXSER_ERR_IRQ_CONFLIT;
2586         } else if (brd->info->nports == 4) {
2587                 irq = regs[9] & 0xF000;
2588                 irq = irq | (irq >> 4);
2589                 irq = irq | (irq >> 8);
2590                 if (irq != regs[9])
2591                         return MXSER_ERR_IRQ_CONFLIT;
2592         } else if (brd->info->nports == 8) {
2593                 irq = regs[9] & 0xF000;
2594                 irq = irq | (irq >> 4);
2595                 irq = irq | (irq >> 8);
2596                 if ((irq != regs[9]) || (irq != regs[10]))
2597                         return MXSER_ERR_IRQ_CONFLIT;
2598         }
2599
2600         if (!irq)
2601                 return MXSER_ERR_IRQ;
2602         brd->irq = ((int)(irq & 0xF000) >> 12);
2603         for (i = 0; i < 8; i++)
2604                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2605         if ((regs[12] & 0x80) == 0)
2606                 return MXSER_ERR_VECTOR;
2607         brd->vector = (int)regs[11];    /* interrupt vector */
2608         if (id == 1)
2609                 brd->vector_mask = 0x00FF;
2610         else
2611                 brd->vector_mask = 0x000F;
2612         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2613                 if (regs[12] & bits) {
2614                         brd->ports[i].baud_base = 921600;
2615                         brd->ports[i].max_baud = 921600;
2616                 } else {
2617                         brd->ports[i].baud_base = 115200;
2618                         brd->ports[i].max_baud = 115200;
2619                 }
2620         }
2621         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2622         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2623         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2624         outb(scratch2, cap + UART_LCR);
2625         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2626         scratch = inb(cap + UART_IIR);
2627
2628         if (scratch & 0xC0)
2629                 brd->uart_type = PORT_16550A;
2630         else
2631                 brd->uart_type = PORT_16450;
2632         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2633                         "mxser(IO)"))
2634                 return MXSER_ERR_IOADDR;
2635         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2636                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2637                 return MXSER_ERR_VECTOR;
2638         }
2639         return brd->info->nports;
2640 }
2641
2642 static int __devinit mxser_probe(struct pci_dev *pdev,
2643                 const struct pci_device_id *ent)
2644 {
2645 #ifdef CONFIG_PCI
2646         struct mxser_board *brd;
2647         unsigned int i, j;
2648         unsigned long ioaddress;
2649         int retval = -EINVAL;
2650
2651         for (i = 0; i < MXSER_BOARDS; i++)
2652                 if (mxser_boards[i].info == NULL)
2653                         break;
2654
2655         if (i >= MXSER_BOARDS) {
2656                 printk(KERN_ERR "Too many Smartio/Industio family boards found "
2657                         "(maximum %d), board not configured\n", MXSER_BOARDS);
2658                 goto err;
2659         }
2660
2661         brd = &mxser_boards[i];
2662         brd->idx = i * MXSER_PORTS_PER_BOARD;
2663         printk(KERN_INFO "Found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2664                 mxser_cards[ent->driver_data].name,
2665                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2666
2667         retval = pci_enable_device(pdev);
2668         if (retval) {
2669                 printk(KERN_ERR "Moxa SmartI/O PCI enable fail !\n");
2670                 goto err;
2671         }
2672
2673         /* io address */
2674         ioaddress = pci_resource_start(pdev, 2);
2675         retval = pci_request_region(pdev, 2, "mxser(IO)");
2676         if (retval)
2677                 goto err;
2678
2679         brd->info = &mxser_cards[ent->driver_data];
2680         for (i = 0; i < brd->info->nports; i++)
2681                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2682
2683         /* vector */
2684         ioaddress = pci_resource_start(pdev, 3);
2685         retval = pci_request_region(pdev, 3, "mxser(vector)");
2686         if (retval)
2687                 goto err_relio;
2688         brd->vector = ioaddress;
2689
2690         /* irq */
2691         brd->irq = pdev->irq;
2692
2693         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2694         brd->uart_type = PORT_16550A;
2695         brd->vector_mask = 0;
2696
2697         for (i = 0; i < brd->info->nports; i++) {
2698                 for (j = 0; j < UART_INFO_NUM; j++) {
2699                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2700                                 brd->ports[i].max_baud =
2701                                         Gpci_uart_info[j].max_baud;
2702
2703                                 /* exception....CP-102 */
2704                                 if (brd->info->flags & MXSER_HIGHBAUD)
2705                                         brd->ports[i].max_baud = 921600;
2706                                 break;
2707                         }
2708                 }
2709         }
2710
2711         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2712                 for (i = 0; i < brd->info->nports; i++) {
2713                         if (i < 4)
2714                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2715                         else
2716                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2717                 }
2718                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2719                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2720         }
2721
2722         for (i = 0; i < brd->info->nports; i++) {
2723                 brd->vector_mask |= (1 << i);
2724                 brd->ports[i].baud_base = 921600;
2725         }
2726
2727         /* mxser_initbrd will hook ISR. */
2728         retval = mxser_initbrd(brd, pdev);
2729         if (retval)
2730                 goto err_null;
2731
2732         for (i = 0; i < brd->info->nports; i++)
2733                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2734
2735         pci_set_drvdata(pdev, brd);
2736
2737         return 0;
2738 err_relio:
2739         pci_release_region(pdev, 2);
2740 err_null:
2741         brd->info = NULL;
2742 err:
2743         return retval;
2744 #else
2745         return -ENODEV;
2746 #endif
2747 }
2748
2749 static void __devexit mxser_remove(struct pci_dev *pdev)
2750 {
2751         struct mxser_board *brd = pci_get_drvdata(pdev);
2752         unsigned int i;
2753
2754         for (i = 0; i < brd->info->nports; i++)
2755                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2756
2757         mxser_release_res(brd, pdev, 1);
2758         brd->info = NULL;
2759 }
2760
2761 static struct pci_driver mxser_driver = {
2762         .name = "mxser",
2763         .id_table = mxser_pcibrds,
2764         .probe = mxser_probe,
2765         .remove = __devexit_p(mxser_remove)
2766 };
2767
2768 static int __init mxser_module_init(void)
2769 {
2770         struct mxser_board *brd;
2771         unsigned long cap;
2772         unsigned int i, m, isaloop;
2773         int retval, b;
2774
2775         pr_debug("Loading module mxser ...\n");
2776
2777         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2778         if (!mxvar_sdriver)
2779                 return -ENOMEM;
2780
2781         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2782                 MXSER_VERSION);
2783
2784         /* Initialize the tty_driver structure */
2785         mxvar_sdriver->owner = THIS_MODULE;
2786         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2787         mxvar_sdriver->name = "ttyMI";
2788         mxvar_sdriver->major = ttymajor;
2789         mxvar_sdriver->minor_start = 0;
2790         mxvar_sdriver->num = MXSER_PORTS + 1;
2791         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2792         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2793         mxvar_sdriver->init_termios = tty_std_termios;
2794         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2795         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2796         tty_set_operations(mxvar_sdriver, &mxser_ops);
2797
2798         retval = tty_register_driver(mxvar_sdriver);
2799         if (retval) {
2800                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2801                                 "tty driver !\n");
2802                 goto err_put;
2803         }
2804
2805         mxvar_diagflag = 0;
2806
2807         m = 0;
2808         /* Start finding ISA boards here */
2809         for (isaloop = 0; isaloop < 2; isaloop++)
2810                 for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
2811                         if (!isaloop)
2812                                 cap = mxserBoardCAP[b]; /* predefined */
2813                         else
2814                                 cap = ioaddr[b]; /* module param */
2815
2816                         if (!cap)
2817                                 continue;
2818
2819                         brd = &mxser_boards[m];
2820                         retval = mxser_get_ISA_conf(cap, brd);
2821
2822                         if (retval != 0)
2823                                 printk(KERN_INFO "Found MOXA %s board "
2824                                         "(CAP=0x%x)\n",
2825                                         brd->info->name, ioaddr[b]);
2826
2827                         if (retval <= 0) {
2828                                 if (retval == MXSER_ERR_IRQ)
2829                                         printk(KERN_ERR "Invalid interrupt "
2830                                                 "number, board not "
2831                                                 "configured\n");
2832                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
2833                                         printk(KERN_ERR "Invalid interrupt "
2834                                                 "number, board not "
2835                                                 "configured\n");
2836                                 else if (retval == MXSER_ERR_VECTOR)
2837                                         printk(KERN_ERR "Invalid interrupt "
2838                                                 "vector, board not "
2839                                                 "configured\n");
2840                                 else if (retval == MXSER_ERR_IOADDR)
2841                                         printk(KERN_ERR "Invalid I/O address, "
2842                                                 "board not configured\n");
2843
2844                                 brd->info = NULL;
2845                                 continue;
2846                         }
2847
2848                         /* mxser_initbrd will hook ISR. */
2849                         if (mxser_initbrd(brd, NULL) < 0) {
2850                                 brd->info = NULL;
2851                                 continue;
2852                         }
2853
2854                         brd->idx = m * MXSER_PORTS_PER_BOARD;
2855                         for (i = 0; i < brd->info->nports; i++)
2856                                 tty_register_device(mxvar_sdriver, brd->idx + i,
2857                                                 NULL);
2858
2859                         m++;
2860                 }
2861
2862         retval = pci_register_driver(&mxser_driver);
2863         if (retval) {
2864                 printk(KERN_ERR "Can't register pci driver\n");
2865                 if (!m) {
2866                         retval = -ENODEV;
2867                         goto err_unr;
2868                 } /* else: we have some ISA cards under control */
2869         }
2870
2871         pr_debug("Done.\n");
2872
2873         return 0;
2874 err_unr:
2875         tty_unregister_driver(mxvar_sdriver);
2876 err_put:
2877         put_tty_driver(mxvar_sdriver);
2878         return retval;
2879 }
2880
2881 static void __exit mxser_module_exit(void)
2882 {
2883         unsigned int i, j;
2884
2885         pr_debug("Unloading module mxser ...\n");
2886
2887         pci_unregister_driver(&mxser_driver);
2888
2889         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2890                 if (mxser_boards[i].info != NULL)
2891                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2892                                 tty_unregister_device(mxvar_sdriver,
2893                                                 mxser_boards[i].idx + j);
2894         tty_unregister_driver(mxvar_sdriver);
2895         put_tty_driver(mxvar_sdriver);
2896
2897         for (i = 0; i < MXSER_BOARDS; i++)
2898                 if (mxser_boards[i].info != NULL)
2899                         mxser_release_res(&mxser_boards[i], NULL, 1);
2900
2901         pr_debug("Done.\n");
2902 }
2903
2904 module_init(mxser_module_init);
2905 module_exit(mxser_module_exit);