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  *      - Fixed sleep with spinlock held in mxser_send_break
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/serial.h>
  31 #include <linux/serial_reg.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/gfp.h>
  37 #include <linux/ioport.h>
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/pci.h>
  41 #include <linux/bitops.h>
  42
  43 #include <asm/system.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.3"         /* 1.11 */
  51 #define MXSERMAJOR       174
  52 #define MXSERCUMAJOR     175
  53
  54 #define MXSER_BOARDS            4       /* Max. boards */
  55 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  56 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  57 #define MXSER_ISR_PASS_LIMIT    100
  58
  59 #define MXSER_ERR_IOADDR        -1
  60 #define MXSER_ERR_IRQ           -2
  61 #define MXSER_ERR_IRQ_CONFLIT   -3
  62 #define MXSER_ERR_VECTOR        -4
  63
  64 /*CheckIsMoxaMust return value*/
  65 #define MOXA_OTHER_UART         0x00
  66 #define MOXA_MUST_MU150_HWID    0x01
  67 #define MOXA_MUST_MU860_HWID    0x02
  68
  69 #define WAKEUP_CHARS            256
  70
  71 #define UART_MCR_AFE            0x20
  72 #define UART_LSR_SPECIAL        0x1E
  73
  74 #define PCI_DEVICE_ID_CB108     0x1080
  75 #define PCI_DEVICE_ID_CB114     0x1142
  76 #define PCI_DEVICE_ID_CP114UL   0x1143
  77 #define PCI_DEVICE_ID_CB134I    0x1341
  78 #define PCI_DEVICE_ID_CP138U    0x1380
  79 #define PCI_DEVICE_ID_POS104UL  0x1044
  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 };
 147
 148 /* driver_data correspond to the lines in the structure above
 149    see also ISA probe function before you change something */
 150 static struct pci_device_id mxser_pcibrds[] = {
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 178
 179 static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 180 static int ttymajor = MXSERMAJOR;
 181
 182 /* Variables for insmod */
 183
 184 MODULE_AUTHOR("Casper Yang");
 185 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 186 module_param_array(ioaddr, int, NULL, 0);
 187 module_param(ttymajor, int, 0);
 188 MODULE_LICENSE("GPL");
 189
 190 struct mxser_log {
 191         int tick;
 192         unsigned long rxcnt[MXSER_PORTS];
 193         unsigned long txcnt[MXSER_PORTS];
 194 };
 195
 196
 197 struct mxser_mon {
 198         unsigned long rxcnt;
 199         unsigned long txcnt;
 200         unsigned long up_rxcnt;
 201         unsigned long up_txcnt;
 202         int modem_status;
 203         unsigned char hold_reason;
 204 };
 205
 206 struct mxser_mon_ext {
 207         unsigned long rx_cnt[32];
 208         unsigned long tx_cnt[32];
 209         unsigned long up_rxcnt[32];
 210         unsigned long up_txcnt[32];
 211         int modem_status[32];
 212
 213         long baudrate[32];
 214         int databits[32];
 215         int stopbits[32];
 216         int parity[32];
 217         int flowctrl[32];
 218         int fifo[32];
 219         int iftype[32];
 220 };
 221
 222 struct mxser_board;
 223
 224 struct mxser_port {
 225         struct tty_port port;
 226         struct mxser_board *board;
 227
 228         unsigned long ioaddr;
 229         unsigned long opmode_ioaddr;
 230         int max_baud;
 231
 232         int rx_high_water;
 233         int rx_trigger;         /* Rx fifo trigger level */
 234         int rx_low_water;
 235         int baud_base;          /* max. speed */
 236         int type;               /* UART type */
 237
 238         int x_char;             /* xon/xoff character */
 239         int IER;                /* Interrupt Enable Register */
 240         int MCR;                /* Modem control register */
 241
 242         unsigned char stop_rx;
 243         unsigned char ldisc_stop_rx;
 244
 245         int custom_divisor;
 246         unsigned char err_shadow;
 247
 248         struct async_icount icount; /* kernel counters for 4 input interrupts */
 249         int timeout;
 250
 251         int read_status_mask;
 252         int ignore_status_mask;
 253         int xmit_fifo_size;
 254         int xmit_head;
 255         int xmit_tail;
 256         int xmit_cnt;
 257
 258         struct ktermios normal_termios;
 259
 260         struct mxser_mon mon_data;
 261
 262         spinlock_t slock;
 263         wait_queue_head_t delta_msr_wait;
 264 };
 265
 266 struct mxser_board {
 267         unsigned int idx;
 268         int irq;
 269         const struct mxser_cardinfo *info;
 270         unsigned long vector;
 271         unsigned long vector_mask;
 272
 273         int chip_flag;
 274         int uart_type;
 275
 276         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 277 };
 278
 279 struct mxser_mstatus {
 280         tcflag_t cflag;
 281         int cts;
 282         int dsr;
 283         int ri;
 284         int dcd;
 285 };
 286
 287 static struct mxser_mstatus GMStatus[MXSER_PORTS];
 288
 289 static int mxserBoardCAP[MXSER_BOARDS] = {
 290         0, 0, 0, 0
 291         /*  0x180, 0x280, 0x200, 0x320 */
 292 };
 293
 294 static struct mxser_board mxser_boards[MXSER_BOARDS];
 295 static struct tty_driver *mxvar_sdriver;
 296 static struct mxser_log mxvar_log;
 297 static int mxvar_diagflag;
 298 static unsigned char mxser_msr[MXSER_PORTS + 1];
 299 static struct mxser_mon_ext mon_data_ext;
 300 static int mxser_set_baud_method[MXSER_PORTS + 1];
 301
 302 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 303 {
 304         u8 oldlcr;
 305         u8 efr;
 306
 307         oldlcr = inb(baseio + UART_LCR);
 308         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 309
 310         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 311         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 312
 313         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 314         outb(oldlcr, baseio + UART_LCR);
 315 }
 316
 317 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 318 {
 319         u8 oldlcr;
 320         u8 efr;
 321
 322         oldlcr = inb(baseio + UART_LCR);
 323         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 324
 325         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 326         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 327
 328         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 329         outb(oldlcr, baseio + UART_LCR);
 330 }
 331
 332 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 333 {
 334         u8 oldlcr;
 335         u8 efr;
 336
 337         oldlcr = inb(baseio + UART_LCR);
 338         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 339
 340         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 341         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 342         efr |= MOXA_MUST_EFR_BANK0;
 343
 344         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 345         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 346         outb(oldlcr, baseio + UART_LCR);
 347 }
 348
 349 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 350 {
 351         u8 oldlcr;
 352         u8 efr;
 353
 354         oldlcr = inb(baseio + UART_LCR);
 355         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 356
 357         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 358         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 359         efr |= MOXA_MUST_EFR_BANK0;
 360
 361         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 362         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 363         outb(oldlcr, baseio + UART_LCR);
 364 }
 365
 366 static void mxser_set_must_fifo_value(struct mxser_port *info)
 367 {
 368         u8 oldlcr;
 369         u8 efr;
 370
 371         oldlcr = inb(info->ioaddr + UART_LCR);
 372         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 373
 374         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 375         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 376         efr |= MOXA_MUST_EFR_BANK1;
 377
 378         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 379         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 380         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 381         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 382         outb(oldlcr, info->ioaddr + UART_LCR);
 383 }
 384
 385 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 386 {
 387         u8 oldlcr;
 388         u8 efr;
 389
 390         oldlcr = inb(baseio + UART_LCR);
 391         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 392
 393         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 394         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 395         efr |= MOXA_MUST_EFR_BANK2;
 396
 397         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 398         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 399         outb(oldlcr, baseio + UART_LCR);
 400 }
 401
 402 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 403 {
 404         u8 oldlcr;
 405         u8 efr;
 406
 407         oldlcr = inb(baseio + UART_LCR);
 408         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 409
 410         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 411         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 412         efr |= MOXA_MUST_EFR_BANK2;
 413
 414         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 415         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 416         outb(oldlcr, baseio + UART_LCR);
 417 }
 418
 419 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 420 {
 421         u8 oldlcr;
 422         u8 efr;
 423
 424         oldlcr = inb(baseio + UART_LCR);
 425         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 426
 427         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 428         efr &= ~MOXA_MUST_EFR_SF_MASK;
 429
 430         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 431         outb(oldlcr, baseio + UART_LCR);
 432 }
 433
 434 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 435 {
 436         u8 oldlcr;
 437         u8 efr;
 438
 439         oldlcr = inb(baseio + UART_LCR);
 440         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 441
 442         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 443         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 444         efr |= MOXA_MUST_EFR_SF_TX1;
 445
 446         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 447         outb(oldlcr, baseio + UART_LCR);
 448 }
 449
 450 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 451 {
 452         u8 oldlcr;
 453         u8 efr;
 454
 455         oldlcr = inb(baseio + UART_LCR);
 456         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 457
 458         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 459         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 460
 461         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 462         outb(oldlcr, baseio + UART_LCR);
 463 }
 464
 465 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 466 {
 467         u8 oldlcr;
 468         u8 efr;
 469
 470         oldlcr = inb(baseio + UART_LCR);
 471         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 472
 473         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 474         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 475         efr |= MOXA_MUST_EFR_SF_RX1;
 476
 477         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 478         outb(oldlcr, baseio + UART_LCR);
 479 }
 480
 481 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 482 {
 483         u8 oldlcr;
 484         u8 efr;
 485
 486         oldlcr = inb(baseio + UART_LCR);
 487         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 488
 489         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 490         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 491
 492         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 493         outb(oldlcr, baseio + UART_LCR);
 494 }
 495
 496 #ifdef CONFIG_PCI
 497 static int __devinit CheckIsMoxaMust(unsigned long io)
 498 {
 499         u8 oldmcr, hwid;
 500         int i;
 501
 502         outb(0, io + UART_LCR);
 503         mxser_disable_must_enchance_mode(io);
 504         oldmcr = inb(io + UART_MCR);
 505         outb(0, io + UART_MCR);
 506         mxser_set_must_xon1_value(io, 0x11);
 507         if ((hwid = inb(io + UART_MCR)) != 0) {
 508                 outb(oldmcr, io + UART_MCR);
 509                 return MOXA_OTHER_UART;
 510         }
 511
 512         mxser_get_must_hardware_id(io, &hwid);
 513         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 514                 if (hwid == Gpci_uart_info[i].type)
 515                         return (int)hwid;
 516         }
 517         return MOXA_OTHER_UART;
 518 }
 519 #endif
 520
 521 static void process_txrx_fifo(struct mxser_port *info)
 522 {
 523         int i;
 524
 525         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 526                 info->rx_trigger = 1;
 527                 info->rx_high_water = 1;
 528                 info->rx_low_water = 1;
 529                 info->xmit_fifo_size = 1;
 530         } else
 531                 for (i = 0; i < UART_INFO_NUM; i++)
 532                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 533                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 534                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 535                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 536                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 537                                 break;
 538                         }
 539 }
 540
 541 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 542 {
 543         unsigned char status = 0;
 544
 545         status = inb(baseaddr + UART_MSR);
 546
 547         mxser_msr[port] &= 0x0F;
 548         mxser_msr[port] |= status;
 549         status = mxser_msr[port];
 550         if (mode)
 551                 mxser_msr[port] = 0;
 552
 553         return status;
 554 }
 555
 556 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 557                 struct mxser_port *port)
 558 {
 559         DECLARE_WAITQUEUE(wait, current);
 560         int retval;
 561         int do_clocal = 0;
 562         unsigned long flags;
 563
 564         /*
 565          * If non-blocking mode is set, or the port is not enabled,
 566          * then make the check up front and then exit.
 567          */
 568         if ((filp->f_flags & O_NONBLOCK) ||
 569                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 570                 port->port.flags |= ASYNC_NORMAL_ACTIVE;
 571                 return 0;
 572         }
 573
 574         if (tty->termios->c_cflag & CLOCAL)
 575                 do_clocal = 1;
 576
 577         /*
 578          * Block waiting for the carrier detect and the line to become
 579          * free (i.e., not in use by the callout).  While we are in
 580          * this loop, port->port.count is dropped by one, so that
 581          * mxser_close() knows when to free things.  We restore it upon
 582          * exit, either normal or abnormal.
 583          */
 584         retval = 0;
 585         add_wait_queue(&port->port.open_wait, &wait);
 586
 587         spin_lock_irqsave(&port->slock, flags);
 588         if (!tty_hung_up_p(filp))
 589                 port->port.count--;
 590         spin_unlock_irqrestore(&port->slock, flags);
 591         port->port.blocked_open++;
 592         while (1) {
 593                 spin_lock_irqsave(&port->slock, flags);
 594                 outb(inb(port->ioaddr + UART_MCR) |
 595                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 596                 spin_unlock_irqrestore(&port->slock, flags);
 597                 set_current_state(TASK_INTERRUPTIBLE);
 598                 if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
 599                         if (port->port.flags & ASYNC_HUP_NOTIFY)
 600                                 retval = -EAGAIN;
 601                         else
 602                                 retval = -ERESTARTSYS;
 603                         break;
 604                 }
 605                 if (!(port->port.flags & ASYNC_CLOSING) &&
 606                                 (do_clocal ||
 607                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 608                         break;
 609                 if (signal_pending(current)) {
 610                         retval = -ERESTARTSYS;
 611                         break;
 612                 }
 613                 schedule();
 614         }
 615         set_current_state(TASK_RUNNING);
 616         remove_wait_queue(&port->port.open_wait, &wait);
 617         if (!tty_hung_up_p(filp))
 618                 port->port.count++;
 619         port->port.blocked_open--;
 620         if (retval)
 621                 return retval;
 622         port->port.flags |= ASYNC_NORMAL_ACTIVE;
 623         return 0;
 624 }
 625
 626 static int mxser_set_baud(struct mxser_port *info, long newspd)
 627 {
 628         int quot = 0, baud;
 629         unsigned char cval;
 630
 631         if (!info->port.tty || !info->port.tty->termios)
 632                 return -1;
 633
 634         if (!(info->ioaddr))
 635                 return -1;
 636
 637         if (newspd > info->max_baud)
 638                 return -1;
 639
 640         if (newspd == 134) {
 641                 quot = 2 * info->baud_base / 269;
 642                 tty_encode_baud_rate(info->port.tty, 134, 134);
 643         } else if (newspd) {
 644                 quot = info->baud_base / newspd;
 645                 if (quot == 0)
 646                         quot = 1;
 647                 baud = info->baud_base/quot;
 648                 tty_encode_baud_rate(info->port.tty, baud, baud);
 649         } else {
 650                 quot = 0;
 651         }
 652
 653         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 654         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 655
 656         if (quot) {
 657                 info->MCR |= UART_MCR_DTR;
 658                 outb(info->MCR, info->ioaddr + UART_MCR);
 659         } else {
 660                 info->MCR &= ~UART_MCR_DTR;
 661                 outb(info->MCR, info->ioaddr + UART_MCR);
 662                 return 0;
 663         }
 664
 665         cval = inb(info->ioaddr + UART_LCR);
 666
 667         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 668
 669         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 670         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 671         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 672
 673 #ifdef BOTHER
 674         if (C_BAUD(info->port.tty) == BOTHER) {
 675                 quot = info->baud_base % newspd;
 676                 quot *= 8;
 677                 if (quot % newspd > newspd / 2) {
 678                         quot /= newspd;
 679                         quot++;
 680                 } else
 681                         quot /= newspd;
 682
 683                 mxser_set_must_enum_value(info->ioaddr, quot);
 684         } else
 685 #endif
 686                 mxser_set_must_enum_value(info->ioaddr, 0);
 687
 688         return 0;
 689 }
 690
 691 /*
 692  * This routine is called to set the UART divisor registers to match
 693  * the specified baud rate for a serial port.
 694  */
 695 static int mxser_change_speed(struct mxser_port *info,
 696                 struct ktermios *old_termios)
 697 {
 698         unsigned cflag, cval, fcr;
 699         int ret = 0;
 700         unsigned char status;
 701
 702         if (!info->port.tty || !info->port.tty->termios)
 703                 return ret;
 704         cflag = info->port.tty->termios->c_cflag;
 705         if (!(info->ioaddr))
 706                 return ret;
 707
 708         if (mxser_set_baud_method[info->port.tty->index] == 0)
 709                 mxser_set_baud(info, tty_get_baud_rate(info->port.tty));
 710
 711         /* byte size and parity */
 712         switch (cflag & CSIZE) {
 713         case CS5:
 714                 cval = 0x00;
 715                 break;
 716         case CS6:
 717                 cval = 0x01;
 718                 break;
 719         case CS7:
 720                 cval = 0x02;
 721                 break;
 722         case CS8:
 723                 cval = 0x03;
 724                 break;
 725         default:
 726                 cval = 0x00;
 727                 break;          /* too keep GCC shut... */
 728         }
 729         if (cflag & CSTOPB)
 730                 cval |= 0x04;
 731         if (cflag & PARENB)
 732                 cval |= UART_LCR_PARITY;
 733         if (!(cflag & PARODD))
 734                 cval |= UART_LCR_EPAR;
 735         if (cflag & CMSPAR)
 736                 cval |= UART_LCR_SPAR;
 737
 738         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 739                 if (info->board->chip_flag) {
 740                         fcr = UART_FCR_ENABLE_FIFO;
 741                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 742                         mxser_set_must_fifo_value(info);
 743                 } else
 744                         fcr = 0;
 745         } else {
 746                 fcr = UART_FCR_ENABLE_FIFO;
 747                 if (info->board->chip_flag) {
 748                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 749                         mxser_set_must_fifo_value(info);
 750                 } else {
 751                         switch (info->rx_trigger) {
 752                         case 1:
 753                                 fcr |= UART_FCR_TRIGGER_1;
 754                                 break;
 755                         case 4:
 756                                 fcr |= UART_FCR_TRIGGER_4;
 757                                 break;
 758                         case 8:
 759                                 fcr |= UART_FCR_TRIGGER_8;
 760                                 break;
 761                         default:
 762                                 fcr |= UART_FCR_TRIGGER_14;
 763                                 break;
 764                         }
 765                 }
 766         }
 767
 768         /* CTS flow control flag and modem status interrupts */
 769         info->IER &= ~UART_IER_MSI;
 770         info->MCR &= ~UART_MCR_AFE;
 771         if (cflag & CRTSCTS) {
 772                 info->port.flags |= ASYNC_CTS_FLOW;
 773                 info->IER |= UART_IER_MSI;
 774                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 775                         info->MCR |= UART_MCR_AFE;
 776                 } else {
 777                         status = inb(info->ioaddr + UART_MSR);
 778                         if (info->port.tty->hw_stopped) {
 779                                 if (status & UART_MSR_CTS) {
 780                                         info->port.tty->hw_stopped = 0;
 781                                         if (info->type != PORT_16550A &&
 782                                                         !info->board->chip_flag) {
 783                                                 outb(info->IER & ~UART_IER_THRI,
 784                                                         info->ioaddr +
 785                                                         UART_IER);
 786                                                 info->IER |= UART_IER_THRI;
 787                                                 outb(info->IER, info->ioaddr +
 788                                                                 UART_IER);
 789                                         }
 790                                         tty_wakeup(info->port.tty);
 791                                 }
 792                         } else {
 793                                 if (!(status & UART_MSR_CTS)) {
 794                                         info->port.tty->hw_stopped = 1;
 795                                         if ((info->type != PORT_16550A) &&
 796                                                         (!info->board->chip_flag)) {
 797                                                 info->IER &= ~UART_IER_THRI;
 798                                                 outb(info->IER, info->ioaddr +
 799                                                                 UART_IER);
 800                                         }
 801                                 }
 802                         }
 803                 }
 804         } else {
 805                 info->port.flags &= ~ASYNC_CTS_FLOW;
 806         }
 807         outb(info->MCR, info->ioaddr + UART_MCR);
 808         if (cflag & CLOCAL) {
 809                 info->port.flags &= ~ASYNC_CHECK_CD;
 810         } else {
 811                 info->port.flags |= ASYNC_CHECK_CD;
 812                 info->IER |= UART_IER_MSI;
 813         }
 814         outb(info->IER, info->ioaddr + UART_IER);
 815
 816         /*
 817          * Set up parity check flag
 818          */
 819         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 820         if (I_INPCK(info->port.tty))
 821                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 822         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
 823                 info->read_status_mask |= UART_LSR_BI;
 824
 825         info->ignore_status_mask = 0;
 826
 827         if (I_IGNBRK(info->port.tty)) {
 828                 info->ignore_status_mask |= UART_LSR_BI;
 829                 info->read_status_mask |= UART_LSR_BI;
 830                 /*
 831                  * If we're ignore parity and break indicators, ignore
 832                  * overruns too.  (For real raw support).
 833                  */
 834                 if (I_IGNPAR(info->port.tty)) {
 835                         info->ignore_status_mask |=
 836                                                 UART_LSR_OE |
 837                                                 UART_LSR_PE |
 838                                                 UART_LSR_FE;
 839                         info->read_status_mask |=
 840                                                 UART_LSR_OE |
 841                                                 UART_LSR_PE |
 842                                                 UART_LSR_FE;
 843                 }
 844         }
 845         if (info->board->chip_flag) {
 846                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(info->port.tty));
 847                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(info->port.tty));
 848                 if (I_IXON(info->port.tty)) {
 849                         mxser_enable_must_rx_software_flow_control(
 850                                         info->ioaddr);
 851                 } else {
 852                         mxser_disable_must_rx_software_flow_control(
 853                                         info->ioaddr);
 854                 }
 855                 if (I_IXOFF(info->port.tty)) {
 856                         mxser_enable_must_tx_software_flow_control(
 857                                         info->ioaddr);
 858                 } else {
 859                         mxser_disable_must_tx_software_flow_control(
 860                                         info->ioaddr);
 861                 }
 862         }
 863
 864
 865         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 866         outb(cval, info->ioaddr + UART_LCR);
 867
 868         return ret;
 869 }
 870
 871 static void mxser_check_modem_status(struct mxser_port *port, int status)
 872 {
 873         /* update input line counters */
 874         if (status & UART_MSR_TERI)
 875                 port->icount.rng++;
 876         if (status & UART_MSR_DDSR)
 877                 port->icount.dsr++;
 878         if (status & UART_MSR_DDCD)
 879                 port->icount.dcd++;
 880         if (status & UART_MSR_DCTS)
 881                 port->icount.cts++;
 882         port->mon_data.modem_status = status;
 883         wake_up_interruptible(&port->delta_msr_wait);
 884
 885         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 886                 if (status & UART_MSR_DCD)
 887                         wake_up_interruptible(&port->port.open_wait);
 888         }
 889
 890         if (port->port.flags & ASYNC_CTS_FLOW) {
 891                 if (port->port.tty->hw_stopped) {
 892                         if (status & UART_MSR_CTS) {
 893                                 port->port.tty->hw_stopped = 0;
 894
 895                                 if ((port->type != PORT_16550A) &&
 896                                                 (!port->board->chip_flag)) {
 897                                         outb(port->IER & ~UART_IER_THRI,
 898                                                 port->ioaddr + UART_IER);
 899                                         port->IER |= UART_IER_THRI;
 900                                         outb(port->IER, port->ioaddr +
 901                                                         UART_IER);
 902                                 }
 903                                 tty_wakeup(port->port.tty);
 904                         }
 905                 } else {
 906                         if (!(status & UART_MSR_CTS)) {
 907                                 port->port.tty->hw_stopped = 1;
 908                                 if (port->type != PORT_16550A &&
 909                                                 !port->board->chip_flag) {
 910                                         port->IER &= ~UART_IER_THRI;
 911                                         outb(port->IER, port->ioaddr +
 912                                                         UART_IER);
 913                                 }
 914                         }
 915                 }
 916         }
 917 }
 918
 919 static int mxser_startup(struct mxser_port *info)
 920 {
 921         unsigned long page;
 922         unsigned long flags;
 923
 924         page = __get_free_page(GFP_KERNEL);
 925         if (!page)
 926                 return -ENOMEM;
 927
 928         spin_lock_irqsave(&info->slock, flags);
 929
 930         if (info->port.flags & ASYNC_INITIALIZED) {
 931                 free_page(page);
 932                 spin_unlock_irqrestore(&info->slock, flags);
 933                 return 0;
 934         }
 935
 936         if (!info->ioaddr || !info->type) {
 937                 if (info->port.tty)
 938                         set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 939                 free_page(page);
 940                 spin_unlock_irqrestore(&info->slock, flags);
 941                 return 0;
 942         }
 943         if (info->port.xmit_buf)
 944                 free_page(page);
 945         else
 946                 info->port.xmit_buf = (unsigned char *) page;
 947
 948         /*
 949          * Clear the FIFO buffers and disable them
 950          * (they will be reenabled in mxser_change_speed())
 951          */
 952         if (info->board->chip_flag)
 953                 outb((UART_FCR_CLEAR_RCVR |
 954                         UART_FCR_CLEAR_XMIT |
 955                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 956         else
 957                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 958                         info->ioaddr + UART_FCR);
 959
 960         /*
 961          * At this point there's no way the LSR could still be 0xFF;
 962          * if it is, then bail out, because there's likely no UART
 963          * here.
 964          */
 965         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 966                 spin_unlock_irqrestore(&info->slock, flags);
 967                 if (capable(CAP_SYS_ADMIN)) {
 968                         if (info->port.tty)
 969                                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 970                         return 0;
 971                 } else
 972                         return -ENODEV;
 973         }
 974
 975         /*
 976          * Clear the interrupt registers.
 977          */
 978         (void) inb(info->ioaddr + UART_LSR);
 979         (void) inb(info->ioaddr + UART_RX);
 980         (void) inb(info->ioaddr + UART_IIR);
 981         (void) inb(info->ioaddr + UART_MSR);
 982
 983         /*
 984          * Now, initialize the UART
 985          */
 986         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 987         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 988         outb(info->MCR, info->ioaddr + UART_MCR);
 989
 990         /*
 991          * Finally, enable interrupts
 992          */
 993         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 994
 995         if (info->board->chip_flag)
 996                 info->IER |= MOXA_MUST_IER_EGDAI;
 997         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 998
 999         /*
1000          * And clear the interrupt registers again for luck.
1001          */
1002         (void) inb(info->ioaddr + UART_LSR);
1003         (void) inb(info->ioaddr + UART_RX);
1004         (void) inb(info->ioaddr + UART_IIR);
1005         (void) inb(info->ioaddr + UART_MSR);
1006
1007         if (info->port.tty)
1008                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1009         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1010
1011         /*
1012          * and set the speed of the serial port
1013          */
1014         mxser_change_speed(info, NULL);
1015         info->port.flags |= ASYNC_INITIALIZED;
1016         spin_unlock_irqrestore(&info->slock, flags);
1017
1018         return 0;
1019 }
1020
1021 /*
1022  * This routine will shutdown a serial port; interrupts maybe disabled, and
1023  * DTR is dropped if the hangup on close termio flag is on.
1024  */
1025 static void mxser_shutdown(struct mxser_port *info)
1026 {
1027         unsigned long flags;
1028
1029         if (!(info->port.flags & ASYNC_INITIALIZED))
1030                 return;
1031
1032         spin_lock_irqsave(&info->slock, flags);
1033
1034         /*
1035          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1036          * here so the queue might never be waken up
1037          */
1038         wake_up_interruptible(&info->delta_msr_wait);
1039
1040         /*
1041          * Free the IRQ, if necessary
1042          */
1043         if (info->port.xmit_buf) {
1044                 free_page((unsigned long) info->port.xmit_buf);
1045                 info->port.xmit_buf = NULL;
1046         }
1047
1048         info->IER = 0;
1049         outb(0x00, info->ioaddr + UART_IER);
1050
1051         if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
1052                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1053         outb(info->MCR, info->ioaddr + UART_MCR);
1054
1055         /* clear Rx/Tx FIFO's */
1056         if (info->board->chip_flag)
1057                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1058                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1059                                 info->ioaddr + UART_FCR);
1060         else
1061                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1062                         info->ioaddr + UART_FCR);
1063
1064         /* read data port to reset things */
1065         (void) inb(info->ioaddr + UART_RX);
1066
1067         if (info->port.tty)
1068                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1069
1070         info->port.flags &= ~ASYNC_INITIALIZED;
1071
1072         if (info->board->chip_flag)
1073                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1074
1075         spin_unlock_irqrestore(&info->slock, flags);
1076 }
1077
1078 /*
1079  * This routine is called whenever a serial port is opened.  It
1080  * enables interrupts for a serial port, linking in its async structure into
1081  * the IRQ chain.   It also performs the serial-specific
1082  * initialization for the tty structure.
1083  */
1084 static int mxser_open(struct tty_struct *tty, struct file *filp)
1085 {
1086         struct mxser_port *info;
1087         unsigned long flags;
1088         int retval, line;
1089
1090         line = tty->index;
1091         if (line == MXSER_PORTS)
1092                 return 0;
1093         if (line < 0 || line > MXSER_PORTS)
1094                 return -ENODEV;
1095         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1096         if (!info->ioaddr)
1097                 return -ENODEV;
1098
1099         tty->driver_data = info;
1100         info->port.tty = tty;
1101         /*
1102          * Start up serial port
1103          */
1104         spin_lock_irqsave(&info->slock, flags);
1105         info->port.count++;
1106         spin_unlock_irqrestore(&info->slock, flags);
1107         retval = mxser_startup(info);
1108         if (retval)
1109                 return retval;
1110
1111         retval = mxser_block_til_ready(tty, filp, info);
1112         if (retval)
1113                 return retval;
1114
1115         /* unmark here for very high baud rate (ex. 921600 bps) used */
1116         tty->low_latency = 1;
1117         return 0;
1118 }
1119
1120 static void mxser_flush_buffer(struct tty_struct *tty)
1121 {
1122         struct mxser_port *info = tty->driver_data;
1123         char fcr;
1124         unsigned long flags;
1125
1126
1127         spin_lock_irqsave(&info->slock, flags);
1128         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1129
1130         fcr = inb(info->ioaddr + UART_FCR);
1131         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1132                 info->ioaddr + UART_FCR);
1133         outb(fcr, info->ioaddr + UART_FCR);
1134
1135         spin_unlock_irqrestore(&info->slock, flags);
1136
1137         tty_wakeup(tty);
1138 }
1139
1140
1141 /*
1142  * This routine is called when the serial port gets closed.  First, we
1143  * wait for the last remaining data to be sent.  Then, we unlink its
1144  * async structure from the interrupt chain if necessary, and we free
1145  * that IRQ if nothing is left in the chain.
1146  */
1147 static void mxser_close(struct tty_struct *tty, struct file *filp)
1148 {
1149         struct mxser_port *info = tty->driver_data;
1150
1151         unsigned long timeout;
1152         unsigned long flags;
1153
1154         if (tty->index == MXSER_PORTS)
1155                 return;
1156         if (!info)
1157                 return;
1158
1159         spin_lock_irqsave(&info->slock, flags);
1160
1161         if (tty_hung_up_p(filp)) {
1162                 spin_unlock_irqrestore(&info->slock, flags);
1163                 return;
1164         }
1165         if ((tty->count == 1) && (info->port.count != 1)) {
1166                 /*
1167                  * Uh, oh.  tty->count is 1, which means that the tty
1168                  * structure will be freed.  Info->port.count should always
1169                  * be one in these conditions.  If it's greater than
1170                  * one, we've got real problems, since it means the
1171                  * serial port won't be shutdown.
1172                  */
1173                 printk(KERN_ERR "mxser_close: bad serial port count; "
1174                         "tty->count is 1, info->port.count is %d\n", info->port.count);
1175                 info->port.count = 1;
1176         }
1177         if (--info->port.count < 0) {
1178                 printk(KERN_ERR "mxser_close: bad serial port count for "
1179                         "ttys%d: %d\n", tty->index, info->port.count);
1180                 info->port.count = 0;
1181         }
1182         if (info->port.count) {
1183                 spin_unlock_irqrestore(&info->slock, flags);
1184                 return;
1185         }
1186         info->port.flags |= ASYNC_CLOSING;
1187         spin_unlock_irqrestore(&info->slock, flags);
1188         /*
1189          * Save the termios structure, since this port may have
1190          * separate termios for callout and dialin.
1191          */
1192         if (info->port.flags & ASYNC_NORMAL_ACTIVE)
1193                 info->normal_termios = *tty->termios;
1194         /*
1195          * Now we wait for the transmit buffer to clear; and we notify
1196          * the line discipline to only process XON/XOFF characters.
1197          */
1198         tty->closing = 1;
1199         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1200                 tty_wait_until_sent(tty, info->port.closing_wait);
1201         /*
1202          * At this point we stop accepting input.  To do this, we
1203          * disable the receive line status interrupts, and tell the
1204          * interrupt driver to stop checking the data ready bit in the
1205          * line status register.
1206          */
1207         info->IER &= ~UART_IER_RLSI;
1208         if (info->board->chip_flag)
1209                 info->IER &= ~MOXA_MUST_RECV_ISR;
1210
1211         if (info->port.flags & ASYNC_INITIALIZED) {
1212                 outb(info->IER, info->ioaddr + UART_IER);
1213                 /*
1214                  * Before we drop DTR, make sure the UART transmitter
1215                  * has completely drained; this is especially
1216                  * important if there is a transmit FIFO!
1217                  */
1218                 timeout = jiffies + HZ;
1219                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1220                         schedule_timeout_interruptible(5);
1221                         if (time_after(jiffies, timeout))
1222                                 break;
1223                 }
1224         }
1225         mxser_shutdown(info);
1226
1227         mxser_flush_buffer(tty);
1228         tty_ldisc_flush(tty);
1229
1230         tty->closing = 0;
1231         info->port.tty = NULL;
1232         if (info->port.blocked_open) {
1233                 if (info->port.close_delay)
1234                         schedule_timeout_interruptible(info->port.close_delay);
1235                 wake_up_interruptible(&info->port.open_wait);
1236         }
1237
1238         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1239 }
1240
1241 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1242 {
1243         int c, total = 0;
1244         struct mxser_port *info = tty->driver_data;
1245         unsigned long flags;
1246
1247         if (!info->port.xmit_buf)
1248                 return 0;
1249
1250         while (1) {
1251                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1252                                           SERIAL_XMIT_SIZE - info->xmit_head));
1253                 if (c <= 0)
1254                         break;
1255
1256                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1257                 spin_lock_irqsave(&info->slock, flags);
1258                 info->xmit_head = (info->xmit_head + c) &
1259                                   (SERIAL_XMIT_SIZE - 1);
1260                 info->xmit_cnt += c;
1261                 spin_unlock_irqrestore(&info->slock, flags);
1262
1263                 buf += c;
1264                 count -= c;
1265                 total += c;
1266         }
1267
1268         if (info->xmit_cnt && !tty->stopped) {
1269                 if (!tty->hw_stopped ||
1270                                 (info->type == PORT_16550A) ||
1271                                 (info->board->chip_flag)) {
1272                         spin_lock_irqsave(&info->slock, flags);
1273                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1274                                         UART_IER);
1275                         info->IER |= UART_IER_THRI;
1276                         outb(info->IER, info->ioaddr + UART_IER);
1277                         spin_unlock_irqrestore(&info->slock, flags);
1278                 }
1279         }
1280         return total;
1281 }
1282
1283 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1284 {
1285         struct mxser_port *info = tty->driver_data;
1286         unsigned long flags;
1287
1288         if (!info->port.xmit_buf)
1289                 return 0;
1290
1291         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1292                 return 0;
1293
1294         spin_lock_irqsave(&info->slock, flags);
1295         info->port.xmit_buf[info->xmit_head++] = ch;
1296         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1297         info->xmit_cnt++;
1298         spin_unlock_irqrestore(&info->slock, flags);
1299         if (!tty->stopped) {
1300                 if (!tty->hw_stopped ||
1301                                 (info->type == PORT_16550A) ||
1302                                 info->board->chip_flag) {
1303                         spin_lock_irqsave(&info->slock, flags);
1304                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1305                         info->IER |= UART_IER_THRI;
1306                         outb(info->IER, info->ioaddr + UART_IER);
1307                         spin_unlock_irqrestore(&info->slock, flags);
1308                 }
1309         }
1310         return 1;
1311 }
1312
1313
1314 static void mxser_flush_chars(struct tty_struct *tty)
1315 {
1316         struct mxser_port *info = tty->driver_data;
1317         unsigned long flags;
1318
1319         if (info->xmit_cnt <= 0 ||
1320                         tty->stopped ||
1321                         !info->port.xmit_buf ||
1322                         (tty->hw_stopped &&
1323                          (info->type != PORT_16550A) &&
1324                          (!info->board->chip_flag)
1325                         ))
1326                 return;
1327
1328         spin_lock_irqsave(&info->slock, flags);
1329
1330         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1331         info->IER |= UART_IER_THRI;
1332         outb(info->IER, info->ioaddr + UART_IER);
1333
1334         spin_unlock_irqrestore(&info->slock, flags);
1335 }
1336
1337 static int mxser_write_room(struct tty_struct *tty)
1338 {
1339         struct mxser_port *info = tty->driver_data;
1340         int ret;
1341
1342         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1343         if (ret < 0)
1344                 ret = 0;
1345         return ret;
1346 }
1347
1348 static int mxser_chars_in_buffer(struct tty_struct *tty)
1349 {
1350         struct mxser_port *info = tty->driver_data;
1351         return info->xmit_cnt;
1352 }
1353
1354 /*
1355  * ------------------------------------------------------------
1356  * friends of mxser_ioctl()
1357  * ------------------------------------------------------------
1358  */
1359 static int mxser_get_serial_info(struct mxser_port *info,
1360                 struct serial_struct __user *retinfo)
1361 {
1362         struct serial_struct tmp = {
1363                 .type = info->type,
1364                 .line = info->port.tty->index,
1365                 .port = info->ioaddr,
1366                 .irq = info->board->irq,
1367                 .flags = info->port.flags,
1368                 .baud_base = info->baud_base,
1369                 .close_delay = info->port.close_delay,
1370                 .closing_wait = info->port.closing_wait,
1371                 .custom_divisor = info->custom_divisor,
1372                 .hub6 = 0
1373         };
1374         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1375                 return -EFAULT;
1376         return 0;
1377 }
1378
1379 static int mxser_set_serial_info(struct mxser_port *info,
1380                 struct serial_struct __user *new_info)
1381 {
1382         struct serial_struct new_serial;
1383         speed_t baud;
1384         unsigned long sl_flags;
1385         unsigned int flags;
1386         int retval = 0;
1387
1388         if (!new_info || !info->ioaddr)
1389                 return -ENODEV;
1390         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1391                 return -EFAULT;
1392
1393         if (new_serial.irq != info->board->irq ||
1394                         new_serial.port != info->ioaddr)
1395                 return -EINVAL;
1396
1397         flags = info->port.flags & ASYNC_SPD_MASK;
1398
1399         if (!capable(CAP_SYS_ADMIN)) {
1400                 if ((new_serial.baud_base != info->baud_base) ||
1401                                 (new_serial.close_delay != info->port.close_delay) ||
1402                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1403                         return -EPERM;
1404                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1405                                 (new_serial.flags & ASYNC_USR_MASK));
1406         } else {
1407                 /*
1408                  * OK, past this point, all the error checking has been done.
1409                  * At this point, we start making changes.....
1410                  */
1411                 info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
1412                                 (new_serial.flags & ASYNC_FLAGS));
1413                 info->port.close_delay = new_serial.close_delay * HZ / 100;
1414                 info->port.closing_wait = new_serial.closing_wait * HZ / 100;
1415                 info->port.tty->low_latency =
1416                                 (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1417                 info->port.tty->low_latency = 0;
1418                 if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1419                                 (new_serial.baud_base != info->baud_base ||
1420                                 new_serial.custom_divisor !=
1421                                 info->custom_divisor)) {
1422                         baud = new_serial.baud_base / new_serial.custom_divisor;
1423                         tty_encode_baud_rate(info->port.tty, baud, baud);
1424                 }
1425         }
1426
1427         info->type = new_serial.type;
1428
1429         process_txrx_fifo(info);
1430
1431         if (info->port.flags & ASYNC_INITIALIZED) {
1432                 if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
1433                         spin_lock_irqsave(&info->slock, sl_flags);
1434                         mxser_change_speed(info, NULL);
1435                         spin_unlock_irqrestore(&info->slock, sl_flags);
1436                 }
1437         } else
1438                 retval = mxser_startup(info);
1439
1440         return retval;
1441 }
1442
1443 /*
1444  * mxser_get_lsr_info - get line status register info
1445  *
1446  * Purpose: Let user call ioctl() to get info when the UART physically
1447  *          is emptied.  On bus types like RS485, the transmitter must
1448  *          release the bus after transmitting. This must be done when
1449  *          the transmit shift register is empty, not be done when the
1450  *          transmit holding register is empty.  This functionality
1451  *          allows an RS485 driver to be written in user space.
1452  */
1453 static int mxser_get_lsr_info(struct mxser_port *info,
1454                 unsigned int __user *value)
1455 {
1456         unsigned char status;
1457         unsigned int result;
1458         unsigned long flags;
1459
1460         spin_lock_irqsave(&info->slock, flags);
1461         status = inb(info->ioaddr + UART_LSR);
1462         spin_unlock_irqrestore(&info->slock, flags);
1463         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1464         return put_user(result, value);
1465 }
1466
1467 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1468 {
1469         struct mxser_port *info = tty->driver_data;
1470         unsigned char control, status;
1471         unsigned long flags;
1472
1473
1474         if (tty->index == MXSER_PORTS)
1475                 return -ENOIOCTLCMD;
1476         if (test_bit(TTY_IO_ERROR, &tty->flags))
1477                 return -EIO;
1478
1479         control = info->MCR;
1480
1481         spin_lock_irqsave(&info->slock, flags);
1482         status = inb(info->ioaddr + UART_MSR);
1483         if (status & UART_MSR_ANY_DELTA)
1484                 mxser_check_modem_status(info, status);
1485         spin_unlock_irqrestore(&info->slock, flags);
1486         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1487                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1488                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1489                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1490                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1491                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1492 }
1493
1494 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1495                 unsigned int set, unsigned int clear)
1496 {
1497         struct mxser_port *info = tty->driver_data;
1498         unsigned long flags;
1499
1500
1501         if (tty->index == MXSER_PORTS)
1502                 return -ENOIOCTLCMD;
1503         if (test_bit(TTY_IO_ERROR, &tty->flags))
1504                 return -EIO;
1505
1506         spin_lock_irqsave(&info->slock, flags);
1507
1508         if (set & TIOCM_RTS)
1509                 info->MCR |= UART_MCR_RTS;
1510         if (set & TIOCM_DTR)
1511                 info->MCR |= UART_MCR_DTR;
1512
1513         if (clear & TIOCM_RTS)
1514                 info->MCR &= ~UART_MCR_RTS;
1515         if (clear & TIOCM_DTR)
1516                 info->MCR &= ~UART_MCR_DTR;
1517
1518         outb(info->MCR, info->ioaddr + UART_MCR);
1519         spin_unlock_irqrestore(&info->slock, flags);
1520         return 0;
1521 }
1522
1523 static int __init mxser_program_mode(int port)
1524 {
1525         int id, i, j, n;
1526
1527         outb(0, port);
1528         outb(0, port);
1529         outb(0, port);
1530         (void)inb(port);
1531         (void)inb(port);
1532         outb(0, port);
1533         (void)inb(port);
1534
1535         id = inb(port + 1) & 0x1F;
1536         if ((id != C168_ASIC_ID) &&
1537                         (id != C104_ASIC_ID) &&
1538                         (id != C102_ASIC_ID) &&
1539                         (id != CI132_ASIC_ID) &&
1540                         (id != CI134_ASIC_ID) &&
1541                         (id != CI104J_ASIC_ID))
1542                 return -1;
1543         for (i = 0, j = 0; i < 4; i++) {
1544                 n = inb(port + 2);
1545                 if (n == 'M') {
1546                         j = 1;
1547                 } else if ((j == 1) && (n == 1)) {
1548                         j = 2;
1549                         break;
1550                 } else
1551                         j = 0;
1552         }
1553         if (j != 2)
1554                 id = -2;
1555         return id;
1556 }
1557
1558 static void __init mxser_normal_mode(int port)
1559 {
1560         int i, n;
1561
1562         outb(0xA5, port + 1);
1563         outb(0x80, port + 3);
1564         outb(12, port + 0);     /* 9600 bps */
1565         outb(0, port + 1);
1566         outb(0x03, port + 3);   /* 8 data bits */
1567         outb(0x13, port + 4);   /* loop back mode */
1568         for (i = 0; i < 16; i++) {
1569                 n = inb(port + 5);
1570                 if ((n & 0x61) == 0x60)
1571                         break;
1572                 if ((n & 1) == 1)
1573                         (void)inb(port);
1574         }
1575         outb(0x00, port + 4);
1576 }
1577
1578 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1579 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1580 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1581 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1582 #define EN_CCMD         0x000   /* Chip's command register     */
1583 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1584 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1585 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1586 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1587 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1588 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1589 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1590 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1591 static int __init mxser_read_register(int port, unsigned short *regs)
1592 {
1593         int i, k, value, id;
1594         unsigned int j;
1595
1596         id = mxser_program_mode(port);
1597         if (id < 0)
1598                 return id;
1599         for (i = 0; i < 14; i++) {
1600                 k = (i & 0x3F) | 0x180;
1601                 for (j = 0x100; j > 0; j >>= 1) {
1602                         outb(CHIP_CS, port);
1603                         if (k & j) {
1604                                 outb(CHIP_CS | CHIP_DO, port);
1605                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1606                         } else {
1607                                 outb(CHIP_CS, port);
1608                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1609                         }
1610                 }
1611                 (void)inb(port);
1612                 value = 0;
1613                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1614                         outb(CHIP_CS, port);
1615                         outb(CHIP_CS | CHIP_SK, port);
1616                         if (inb(port) & CHIP_DI)
1617                                 value |= j;
1618                 }
1619                 regs[i] = value;
1620                 outb(0, port);
1621         }
1622         mxser_normal_mode(port);
1623         return id;
1624 }
1625
1626 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1627 {
1628         struct mxser_port *port;
1629         int result, status;
1630         unsigned int i, j;
1631         int ret = 0;
1632
1633         switch (cmd) {
1634         case MOXA_GET_MAJOR:
1635                 return put_user(ttymajor, (int __user *)argp);
1636
1637         case MOXA_CHKPORTENABLE:
1638                 result = 0;
1639                 lock_kernel();
1640                 for (i = 0; i < MXSER_BOARDS; i++)
1641                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1642                                 if (mxser_boards[i].ports[j].ioaddr)
1643                                         result |= (1 << i);
1644                 unlock_kernel();
1645                 return put_user(result, (unsigned long __user *)argp);
1646         case MOXA_GETDATACOUNT:
1647                 lock_kernel();
1648                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1649                         ret = -EFAULT;
1650                 unlock_kernel();
1651                 return ret;
1652         case MOXA_GETMSTATUS:
1653                 lock_kernel();
1654                 for (i = 0; i < MXSER_BOARDS; i++)
1655                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1656                                 port = &mxser_boards[i].ports[j];
1657
1658                                 GMStatus[i].ri = 0;
1659                                 if (!port->ioaddr) {
1660                                         GMStatus[i].dcd = 0;
1661                                         GMStatus[i].dsr = 0;
1662                                         GMStatus[i].cts = 0;
1663                                         continue;
1664                                 }
1665
1666                                 if (!port->port.tty || !port->port.tty->termios)
1667                                         GMStatus[i].cflag =
1668                                                 port->normal_termios.c_cflag;
1669                                 else
1670                                         GMStatus[i].cflag =
1671                                                 port->port.tty->termios->c_cflag;
1672
1673                                 status = inb(port->ioaddr + UART_MSR);
1674                                 if (status & 0x80 /*UART_MSR_DCD */ )
1675                                         GMStatus[i].dcd = 1;
1676                                 else
1677                                         GMStatus[i].dcd = 0;
1678
1679                                 if (status & 0x20 /*UART_MSR_DSR */ )
1680                                         GMStatus[i].dsr = 1;
1681                                 else
1682                                         GMStatus[i].dsr = 0;
1683
1684
1685                                 if (status & 0x10 /*UART_MSR_CTS */ )
1686                                         GMStatus[i].cts = 1;
1687                                 else
1688                                         GMStatus[i].cts = 0;
1689                         }
1690                 unlock_kernel();
1691                 if (copy_to_user(argp, GMStatus,
1692                                 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1693                         return -EFAULT;
1694                 return 0;
1695         case MOXA_ASPP_MON_EXT: {
1696                 int p, shiftbit;
1697                 unsigned long opmode;
1698                 unsigned cflag, iflag;
1699
1700                 lock_kernel();
1701                 for (i = 0; i < MXSER_BOARDS; i++) {
1702                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1703                                 port = &mxser_boards[i].ports[j];
1704                                 if (!port->ioaddr)
1705                                         continue;
1706
1707                                 status = mxser_get_msr(port->ioaddr, 0, i);
1708
1709                                 if (status & UART_MSR_TERI)
1710                                         port->icount.rng++;
1711                                 if (status & UART_MSR_DDSR)
1712                                         port->icount.dsr++;
1713                                 if (status & UART_MSR_DDCD)
1714                                         port->icount.dcd++;
1715                                 if (status & UART_MSR_DCTS)
1716                                         port->icount.cts++;
1717
1718                                 port->mon_data.modem_status = status;
1719                                 mon_data_ext.rx_cnt[i] = port->mon_data.rxcnt;
1720                                 mon_data_ext.tx_cnt[i] = port->mon_data.txcnt;
1721                                 mon_data_ext.up_rxcnt[i] =
1722                                         port->mon_data.up_rxcnt;
1723                                 mon_data_ext.up_txcnt[i] =
1724                                         port->mon_data.up_txcnt;
1725                                 mon_data_ext.modem_status[i] =
1726                                         port->mon_data.modem_status;
1727                                 mon_data_ext.baudrate[i] =
1728                                         tty_get_baud_rate(port->port.tty);
1729
1730                                 if (!port->port.tty || !port->port.tty->termios) {
1731                                         cflag = port->normal_termios.c_cflag;
1732                                         iflag = port->normal_termios.c_iflag;
1733                                 } else {
1734                                         cflag = port->port.tty->termios->c_cflag;
1735                                         iflag = port->port.tty->termios->c_iflag;
1736                                 }
1737
1738                                 mon_data_ext.databits[i] = cflag & CSIZE;
1739
1740                                 mon_data_ext.stopbits[i] = cflag & CSTOPB;
1741
1742                                 mon_data_ext.parity[i] =
1743                                         cflag & (PARENB | PARODD | CMSPAR);
1744
1745                                 mon_data_ext.flowctrl[i] = 0x00;
1746
1747                                 if (cflag & CRTSCTS)
1748                                         mon_data_ext.flowctrl[i] |= 0x03;
1749
1750                                 if (iflag & (IXON | IXOFF))
1751                                         mon_data_ext.flowctrl[i] |= 0x0C;
1752
1753                                 if (port->type == PORT_16550A)
1754                                         mon_data_ext.fifo[i] = 1;
1755                                 else
1756                                         mon_data_ext.fifo[i] = 0;
1757
1758                                 p = i % 4;
1759                                 shiftbit = p * 2;
1760                                 opmode = inb(port->opmode_ioaddr) >> shiftbit;
1761                                 opmode &= OP_MODE_MASK;
1762
1763                                 mon_data_ext.iftype[i] = opmode;
1764
1765                         }
1766                 }
1767                 unlock_kernel();
1768                 if (copy_to_user(argp, &mon_data_ext,
1769                                         sizeof(mon_data_ext)))
1770                         return -EFAULT;
1771                 return 0;
1772         }
1773         default:
1774                 return -ENOIOCTLCMD;
1775         }
1776         return 0;
1777 }
1778
1779 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1780                 struct async_icount *cprev)
1781 {
1782         struct async_icount cnow;
1783         unsigned long flags;
1784         int ret;
1785
1786         spin_lock_irqsave(&info->slock, flags);
1787         cnow = info->icount;    /* atomic copy */
1788         spin_unlock_irqrestore(&info->slock, flags);
1789
1790         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1791                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1792                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1793                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1794
1795         *cprev = cnow;
1796
1797         return ret;
1798 }
1799
1800 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1801                 unsigned int cmd, unsigned long arg)
1802 {
1803         struct mxser_port *info = tty->driver_data;
1804         struct async_icount cnow;
1805         struct serial_icounter_struct __user *p_cuser;
1806         unsigned long flags;
1807         void __user *argp = (void __user *)arg;
1808         int retval;
1809
1810         if (tty->index == MXSER_PORTS)
1811                 return mxser_ioctl_special(cmd, argp);
1812
1813         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1814                 int p;
1815                 unsigned long opmode;
1816                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1817                 int shiftbit;
1818                 unsigned char val, mask;
1819
1820                 p = tty->index % 4;
1821                 if (cmd == MOXA_SET_OP_MODE) {
1822                         if (get_user(opmode, (int __user *) argp))
1823                                 return -EFAULT;
1824                         if (opmode != RS232_MODE &&
1825                                         opmode != RS485_2WIRE_MODE &&
1826                                         opmode != RS422_MODE &&
1827                                         opmode != RS485_4WIRE_MODE)
1828                                 return -EFAULT;
1829                         lock_kernel();
1830                         mask = ModeMask[p];
1831                         shiftbit = p * 2;
1832                         val = inb(info->opmode_ioaddr);
1833                         val &= mask;
1834                         val |= (opmode << shiftbit);
1835                         outb(val, info->opmode_ioaddr);
1836                         unlock_kernel();
1837                 } else {
1838                         lock_kernel();
1839                         shiftbit = p * 2;
1840                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1841                         opmode &= OP_MODE_MASK;
1842                         unlock_kernel();
1843                         if (put_user(opmode, (int __user *)argp))
1844                                 return -EFAULT;
1845                 }
1846                 return 0;
1847         }
1848
1849         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1850                         test_bit(TTY_IO_ERROR, &tty->flags))
1851                 return -EIO;
1852
1853         switch (cmd) {
1854         case TIOCGSERIAL:
1855                 lock_kernel();
1856                 retval = mxser_get_serial_info(info, argp);
1857                 unlock_kernel();
1858                 return retval;
1859         case TIOCSSERIAL:
1860                 lock_kernel();
1861                 retval = mxser_set_serial_info(info, argp);
1862                 unlock_kernel();
1863                 return retval;
1864         case TIOCSERGETLSR:     /* Get line status register */
1865                 return  mxser_get_lsr_info(info, argp);
1866                 /*
1867                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1868                  * - mask passed in arg for lines of interest
1869                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1870                  * Caller should use TIOCGICOUNT to see which one it was
1871                  */
1872         case TIOCMIWAIT:
1873                 spin_lock_irqsave(&info->slock, flags);
1874                 cnow = info->icount;    /* note the counters on entry */
1875                 spin_unlock_irqrestore(&info->slock, flags);
1876
1877                 return wait_event_interruptible(info->delta_msr_wait,
1878                                 mxser_cflags_changed(info, arg, &cnow));
1879         /*
1880          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1881          * Return: write counters to the user passed counter struct
1882          * NB: both 1->0 and 0->1 transitions are counted except for
1883          *     RI where only 0->1 is counted.
1884          */
1885         case TIOCGICOUNT:
1886                 spin_lock_irqsave(&info->slock, flags);
1887                 cnow = info->icount;
1888                 spin_unlock_irqrestore(&info->slock, flags);
1889                 p_cuser = argp;
1890                 if (put_user(cnow.frame, &p_cuser->frame))
1891                         return -EFAULT;
1892                 if (put_user(cnow.brk, &p_cuser->brk))
1893                         return -EFAULT;
1894                 if (put_user(cnow.overrun, &p_cuser->overrun))
1895                         return -EFAULT;
1896                 if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1897                         return -EFAULT;
1898                 if (put_user(cnow.parity, &p_cuser->parity))
1899                         return -EFAULT;
1900                 if (put_user(cnow.rx, &p_cuser->rx))
1901                         return -EFAULT;
1902                 if (put_user(cnow.tx, &p_cuser->tx))
1903                         return -EFAULT;
1904                 put_user(cnow.cts, &p_cuser->cts);
1905                 put_user(cnow.dsr, &p_cuser->dsr);
1906                 put_user(cnow.rng, &p_cuser->rng);
1907                 put_user(cnow.dcd, &p_cuser->dcd);
1908                 return 0;
1909         case MOXA_HighSpeedOn:
1910                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1911         case MOXA_SDS_RSTICOUNTER:
1912                 lock_kernel();
1913                 info->mon_data.rxcnt = 0;
1914                 info->mon_data.txcnt = 0;
1915                 unlock_kernel();
1916                 return 0;
1917
1918         case MOXA_ASPP_OQUEUE:{
1919                 int len, lsr;
1920
1921                 lock_kernel();
1922                 len = mxser_chars_in_buffer(tty);
1923                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1924                 len += (lsr ? 0 : 1);
1925                 unlock_kernel();
1926
1927                 return put_user(len, (int __user *)argp);
1928         }
1929         case MOXA_ASPP_MON: {
1930                 int mcr, status;
1931
1932                 lock_kernel();
1933                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1934                 mxser_check_modem_status(info, status);
1935
1936                 mcr = inb(info->ioaddr + UART_MCR);
1937                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1938                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1939                 else
1940                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1941
1942                 if (mcr & MOXA_MUST_MCR_TX_XON)
1943                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1944                 else
1945                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1946
1947                 if (info->port.tty->hw_stopped)
1948                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1949                 else
1950                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1951                 unlock_kernel();
1952                 if (copy_to_user(argp, &info->mon_data,
1953                                 sizeof(struct mxser_mon)))
1954                         return -EFAULT;
1955
1956                 return 0;
1957         }
1958         case MOXA_ASPP_LSTATUS: {
1959                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1960                         return -EFAULT;
1961
1962                 info->err_shadow = 0;
1963                 return 0;
1964         }
1965         case MOXA_SET_BAUD_METHOD: {
1966                 int method;
1967
1968                 if (get_user(method, (int __user *)argp))
1969                         return -EFAULT;
1970                 mxser_set_baud_method[tty->index] = method;
1971                 return put_user(method, (int __user *)argp);
1972         }
1973         default:
1974                 return -ENOIOCTLCMD;
1975         }
1976         return 0;
1977 }
1978
1979 static void mxser_stoprx(struct tty_struct *tty)
1980 {
1981         struct mxser_port *info = tty->driver_data;
1982
1983         info->ldisc_stop_rx = 1;
1984         if (I_IXOFF(tty)) {
1985                 if (info->board->chip_flag) {
1986                         info->IER &= ~MOXA_MUST_RECV_ISR;
1987                         outb(info->IER, info->ioaddr + UART_IER);
1988                 } else {
1989                         info->x_char = STOP_CHAR(tty);
1990                         outb(0, info->ioaddr + UART_IER);
1991                         info->IER |= UART_IER_THRI;
1992                         outb(info->IER, info->ioaddr + UART_IER);
1993                 }
1994         }
1995
1996         if (info->port.tty->termios->c_cflag & CRTSCTS) {
1997                 info->MCR &= ~UART_MCR_RTS;
1998                 outb(info->MCR, info->ioaddr + UART_MCR);
1999         }
2000 }
2001
2002 /*
2003  * This routine is called by the upper-layer tty layer to signal that
2004  * incoming characters should be throttled.
2005  */
2006 static void mxser_throttle(struct tty_struct *tty)
2007 {
2008         mxser_stoprx(tty);
2009 }
2010
2011 static void mxser_unthrottle(struct tty_struct *tty)
2012 {
2013         struct mxser_port *info = tty->driver_data;
2014
2015         /* startrx */
2016         info->ldisc_stop_rx = 0;
2017         if (I_IXOFF(tty)) {
2018                 if (info->x_char)
2019                         info->x_char = 0;
2020                 else {
2021                         if (info->board->chip_flag) {
2022                                 info->IER |= MOXA_MUST_RECV_ISR;
2023                                 outb(info->IER, info->ioaddr + UART_IER);
2024                         } else {
2025                                 info->x_char = START_CHAR(tty);
2026                                 outb(0, info->ioaddr + UART_IER);
2027                                 info->IER |= UART_IER_THRI;
2028                                 outb(info->IER, info->ioaddr + UART_IER);
2029                         }
2030                 }
2031         }
2032
2033         if (info->port.tty->termios->c_cflag & CRTSCTS) {
2034                 info->MCR |= UART_MCR_RTS;
2035                 outb(info->MCR, info->ioaddr + UART_MCR);
2036         }
2037 }
2038
2039 /*
2040  * mxser_stop() and mxser_start()
2041  *
2042  * This routines are called before setting or resetting tty->stopped.
2043  * They enable or disable transmitter interrupts, as necessary.
2044  */
2045 static void mxser_stop(struct tty_struct *tty)
2046 {
2047         struct mxser_port *info = tty->driver_data;
2048         unsigned long flags;
2049
2050         spin_lock_irqsave(&info->slock, flags);
2051         if (info->IER & UART_IER_THRI) {
2052                 info->IER &= ~UART_IER_THRI;
2053                 outb(info->IER, info->ioaddr + UART_IER);
2054         }
2055         spin_unlock_irqrestore(&info->slock, flags);
2056 }
2057
2058 static void mxser_start(struct tty_struct *tty)
2059 {
2060         struct mxser_port *info = tty->driver_data;
2061         unsigned long flags;
2062
2063         spin_lock_irqsave(&info->slock, flags);
2064         if (info->xmit_cnt && info->port.xmit_buf) {
2065                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2066                 info->IER |= UART_IER_THRI;
2067                 outb(info->IER, info->ioaddr + UART_IER);
2068         }
2069         spin_unlock_irqrestore(&info->slock, flags);
2070 }
2071
2072 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2073 {
2074         struct mxser_port *info = tty->driver_data;
2075         unsigned long flags;
2076
2077         spin_lock_irqsave(&info->slock, flags);
2078         mxser_change_speed(info, old_termios);
2079         spin_unlock_irqrestore(&info->slock, flags);
2080
2081         if ((old_termios->c_cflag & CRTSCTS) &&
2082                         !(tty->termios->c_cflag & CRTSCTS)) {
2083                 tty->hw_stopped = 0;
2084                 mxser_start(tty);
2085         }
2086
2087         /* Handle sw stopped */
2088         if ((old_termios->c_iflag & IXON) &&
2089                         !(tty->termios->c_iflag & IXON)) {
2090                 tty->stopped = 0;
2091
2092                 if (info->board->chip_flag) {
2093                         spin_lock_irqsave(&info->slock, flags);
2094                         mxser_disable_must_rx_software_flow_control(
2095                                         info->ioaddr);
2096                         spin_unlock_irqrestore(&info->slock, flags);
2097                 }
2098
2099                 mxser_start(tty);
2100         }
2101 }
2102
2103 /*
2104  * mxser_wait_until_sent() --- wait until the transmitter is empty
2105  */
2106 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2107 {
2108         struct mxser_port *info = tty->driver_data;
2109         unsigned long orig_jiffies, char_time;
2110         int lsr;
2111
2112         if (info->type == PORT_UNKNOWN)
2113                 return;
2114
2115         if (info->xmit_fifo_size == 0)
2116                 return;         /* Just in case.... */
2117
2118         orig_jiffies = jiffies;
2119         /*
2120          * Set the check interval to be 1/5 of the estimated time to
2121          * send a single character, and make it at least 1.  The check
2122          * interval should also be less than the timeout.
2123          *
2124          * Note: we have to use pretty tight timings here to satisfy
2125          * the NIST-PCTS.
2126          */
2127         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2128         char_time = char_time / 5;
2129         if (char_time == 0)
2130                 char_time = 1;
2131         if (timeout && timeout < char_time)
2132                 char_time = timeout;
2133         /*
2134          * If the transmitter hasn't cleared in twice the approximate
2135          * amount of time to send the entire FIFO, it probably won't
2136          * ever clear.  This assumes the UART isn't doing flow
2137          * control, which is currently the case.  Hence, if it ever
2138          * takes longer than info->timeout, this is probably due to a
2139          * UART bug of some kind.  So, we clamp the timeout parameter at
2140          * 2*info->timeout.
2141          */
2142         if (!timeout || timeout > 2 * info->timeout)
2143                 timeout = 2 * info->timeout;
2144 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2145         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2146                 timeout, char_time);
2147         printk("jiff=%lu...", jiffies);
2148 #endif
2149         lock_kernel();
2150         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2151 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2152                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2153 #endif
2154                 schedule_timeout_interruptible(char_time);
2155                 if (signal_pending(current))
2156                         break;
2157                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2158                         break;
2159         }
2160         set_current_state(TASK_RUNNING);
2161         unlock_kernel();
2162
2163 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2164         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2165 #endif
2166 }
2167
2168 /*
2169  * This routine is called by tty_hangup() when a hangup is signaled.
2170  */
2171 static void mxser_hangup(struct tty_struct *tty)
2172 {
2173         struct mxser_port *info = tty->driver_data;
2174
2175         mxser_flush_buffer(tty);
2176         mxser_shutdown(info);
2177         info->port.count = 0;
2178         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2179         info->port.tty = NULL;
2180         wake_up_interruptible(&info->port.open_wait);
2181 }
2182
2183 /*
2184  * mxser_rs_break() --- routine which turns the break handling on or off
2185  */
2186 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2187 {
2188         struct mxser_port *info = tty->driver_data;
2189         unsigned long flags;
2190
2191         spin_lock_irqsave(&info->slock, flags);
2192         if (break_state == -1)
2193                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2194                         info->ioaddr + UART_LCR);
2195         else
2196                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2197                         info->ioaddr + UART_LCR);
2198         spin_unlock_irqrestore(&info->slock, flags);
2199         return 0;
2200 }
2201
2202 static void mxser_receive_chars(struct mxser_port *port, int *status)
2203 {
2204         struct tty_struct *tty = port->port.tty;
2205         unsigned char ch, gdl;
2206         int ignored = 0;
2207         int cnt = 0;
2208         int recv_room;
2209         int max = 256;
2210
2211         recv_room = tty->receive_room;
2212         if ((recv_room == 0) && (!port->ldisc_stop_rx))
2213                 mxser_stoprx(tty);
2214
2215         if (port->board->chip_flag != MOXA_OTHER_UART) {
2216
2217                 if (*status & UART_LSR_SPECIAL)
2218                         goto intr_old;
2219                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2220                                 (*status & MOXA_MUST_LSR_RERR))
2221                         goto intr_old;
2222                 if (*status & MOXA_MUST_LSR_RERR)
2223                         goto intr_old;
2224
2225                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2226
2227                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2228                         gdl &= MOXA_MUST_GDL_MASK;
2229                 if (gdl >= recv_room) {
2230                         if (!port->ldisc_stop_rx)
2231                                 mxser_stoprx(tty);
2232                 }
2233                 while (gdl--) {
2234                         ch = inb(port->ioaddr + UART_RX);
2235                         tty_insert_flip_char(tty, ch, 0);
2236                         cnt++;
2237                 }
2238                 goto end_intr;
2239         }
2240 intr_old:
2241
2242         do {
2243                 if (max-- < 0)
2244                         break;
2245
2246                 ch = inb(port->ioaddr + UART_RX);
2247                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2248                         outb(0x23, port->ioaddr + UART_FCR);
2249                 *status &= port->read_status_mask;
2250                 if (*status & port->ignore_status_mask) {
2251                         if (++ignored > 100)
2252                                 break;
2253                 } else {
2254                         char flag = 0;
2255                         if (*status & UART_LSR_SPECIAL) {
2256                                 if (*status & UART_LSR_BI) {
2257                                         flag = TTY_BREAK;
2258                                         port->icount.brk++;
2259
2260                                         if (port->port.flags & ASYNC_SAK)
2261                                                 do_SAK(tty);
2262                                 } else if (*status & UART_LSR_PE) {
2263                                         flag = TTY_PARITY;
2264                                         port->icount.parity++;
2265                                 } else if (*status & UART_LSR_FE) {
2266                                         flag = TTY_FRAME;
2267                                         port->icount.frame++;
2268                                 } else if (*status & UART_LSR_OE) {
2269                                         flag = TTY_OVERRUN;
2270                                         port->icount.overrun++;
2271                                 } else
2272                                         flag = TTY_BREAK;
2273                         }
2274                         tty_insert_flip_char(tty, ch, flag);
2275                         cnt++;
2276                         if (cnt >= recv_room) {
2277                                 if (!port->ldisc_stop_rx)
2278                                         mxser_stoprx(tty);
2279                                 break;
2280                         }
2281
2282                 }
2283
2284                 if (port->board->chip_flag)
2285                         break;
2286
2287                 *status = inb(port->ioaddr + UART_LSR);
2288         } while (*status & UART_LSR_DR);
2289
2290 end_intr:
2291         mxvar_log.rxcnt[port->port.tty->index] += cnt;
2292         port->mon_data.rxcnt += cnt;
2293         port->mon_data.up_rxcnt += cnt;
2294
2295         /*
2296          * We are called from an interrupt context with &port->slock
2297          * being held. Drop it temporarily in order to prevent
2298          * recursive locking.
2299          */
2300         spin_unlock(&port->slock);
2301         tty_flip_buffer_push(tty);
2302         spin_lock(&port->slock);
2303 }
2304
2305 static void mxser_transmit_chars(struct mxser_port *port)
2306 {
2307         int count, cnt;
2308
2309         if (port->x_char) {
2310                 outb(port->x_char, port->ioaddr + UART_TX);
2311                 port->x_char = 0;
2312                 mxvar_log.txcnt[port->port.tty->index]++;
2313                 port->mon_data.txcnt++;
2314                 port->mon_data.up_txcnt++;
2315                 port->icount.tx++;
2316                 return;
2317         }
2318
2319         if (port->port.xmit_buf == NULL)
2320                 return;
2321
2322         if ((port->xmit_cnt <= 0) || port->port.tty->stopped ||
2323                         (port->port.tty->hw_stopped &&
2324                         (port->type != PORT_16550A) &&
2325                         (!port->board->chip_flag))) {
2326                 port->IER &= ~UART_IER_THRI;
2327                 outb(port->IER, port->ioaddr + UART_IER);
2328                 return;
2329         }
2330
2331         cnt = port->xmit_cnt;
2332         count = port->xmit_fifo_size;
2333         do {
2334                 outb(port->port.xmit_buf[port->xmit_tail++],
2335                         port->ioaddr + UART_TX);
2336                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2337                 if (--port->xmit_cnt <= 0)
2338                         break;
2339         } while (--count > 0);
2340         mxvar_log.txcnt[port->port.tty->index] += (cnt - port->xmit_cnt);
2341
2342         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2343         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2344         port->icount.tx += (cnt - port->xmit_cnt);
2345
2346         if (port->xmit_cnt < WAKEUP_CHARS)
2347                 tty_wakeup(port->port.tty);
2348
2349         if (port->xmit_cnt <= 0) {
2350                 port->IER &= ~UART_IER_THRI;
2351                 outb(port->IER, port->ioaddr + UART_IER);
2352         }
2353 }
2354
2355 /*
2356  * This is the serial driver's generic interrupt routine
2357  */
2358 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2359 {
2360         int status, iir, i;
2361         struct mxser_board *brd = NULL;
2362         struct mxser_port *port;
2363         int max, irqbits, bits, msr;
2364         unsigned int int_cnt, pass_counter = 0;
2365         int handled = IRQ_NONE;
2366
2367         for (i = 0; i < MXSER_BOARDS; i++)
2368                 if (dev_id == &mxser_boards[i]) {
2369                         brd = dev_id;
2370                         break;
2371                 }
2372
2373         if (i == MXSER_BOARDS)
2374                 goto irq_stop;
2375         if (brd == NULL)
2376                 goto irq_stop;
2377         max = brd->info->nports;
2378         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2379                 irqbits = inb(brd->vector) & brd->vector_mask;
2380                 if (irqbits == brd->vector_mask)
2381                         break;
2382
2383                 handled = IRQ_HANDLED;
2384                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2385                         if (irqbits == brd->vector_mask)
2386                                 break;
2387                         if (bits & irqbits)
2388                                 continue;
2389                         port = &brd->ports[i];
2390
2391                         int_cnt = 0;
2392                         spin_lock(&port->slock);
2393                         do {
2394                                 iir = inb(port->ioaddr + UART_IIR);
2395                                 if (iir & UART_IIR_NO_INT)
2396                                         break;
2397                                 iir &= MOXA_MUST_IIR_MASK;
2398                                 if (!port->port.tty ||
2399                                                 (port->port.flags & ASYNC_CLOSING) ||
2400                                                 !(port->port.flags &
2401                                                         ASYNC_INITIALIZED)) {
2402                                         status = inb(port->ioaddr + UART_LSR);
2403                                         outb(0x27, port->ioaddr + UART_FCR);
2404                                         inb(port->ioaddr + UART_MSR);
2405                                         break;
2406                                 }
2407
2408                                 status = inb(port->ioaddr + UART_LSR);
2409
2410                                 if (status & UART_LSR_PE)
2411                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2412                                 if (status & UART_LSR_FE)
2413                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2414                                 if (status & UART_LSR_OE)
2415                                         port->err_shadow |=
2416                                                 NPPI_NOTIFY_HW_OVERRUN;
2417                                 if (status & UART_LSR_BI)
2418                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2419
2420                                 if (port->board->chip_flag) {
2421                                         if (iir == MOXA_MUST_IIR_GDA ||
2422                                             iir == MOXA_MUST_IIR_RDA ||
2423                                             iir == MOXA_MUST_IIR_RTO ||
2424                                             iir == MOXA_MUST_IIR_LSR)
2425                                                 mxser_receive_chars(port,
2426                                                                 &status);
2427
2428                                 } else {
2429                                         status &= port->read_status_mask;
2430                                         if (status & UART_LSR_DR)
2431                                                 mxser_receive_chars(port,
2432                                                                 &status);
2433                                 }
2434                                 msr = inb(port->ioaddr + UART_MSR);
2435                                 if (msr & UART_MSR_ANY_DELTA)
2436                                         mxser_check_modem_status(port, msr);
2437
2438                                 if (port->board->chip_flag) {
2439                                         if (iir == 0x02 && (status &
2440                                                                 UART_LSR_THRE))
2441                                                 mxser_transmit_chars(port);
2442                                 } else {
2443                                         if (status & UART_LSR_THRE)
2444                                                 mxser_transmit_chars(port);
2445                                 }
2446                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2447                         spin_unlock(&port->slock);
2448                 }
2449         }
2450
2451 irq_stop:
2452         return handled;
2453 }
2454
2455 static const struct tty_operations mxser_ops = {
2456         .open = mxser_open,
2457         .close = mxser_close,
2458         .write = mxser_write,
2459         .put_char = mxser_put_char,
2460         .flush_chars = mxser_flush_chars,
2461         .write_room = mxser_write_room,
2462         .chars_in_buffer = mxser_chars_in_buffer,
2463         .flush_buffer = mxser_flush_buffer,
2464         .ioctl = mxser_ioctl,
2465         .throttle = mxser_throttle,
2466         .unthrottle = mxser_unthrottle,
2467         .set_termios = mxser_set_termios,
2468         .stop = mxser_stop,
2469         .start = mxser_start,
2470         .hangup = mxser_hangup,
2471         .break_ctl = mxser_rs_break,
2472         .wait_until_sent = mxser_wait_until_sent,
2473         .tiocmget = mxser_tiocmget,
2474         .tiocmset = mxser_tiocmset,
2475 };
2476
2477 /*
2478  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2479  */
2480
2481 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2482                 unsigned int irq)
2483 {
2484         if (irq)
2485                 free_irq(brd->irq, brd);
2486         if (pdev != NULL) {     /* PCI */
2487 #ifdef CONFIG_PCI
2488                 pci_release_region(pdev, 2);
2489                 pci_release_region(pdev, 3);
2490 #endif
2491         } else {
2492                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2493                 release_region(brd->vector, 1);
2494         }
2495 }
2496
2497 static int __devinit mxser_initbrd(struct mxser_board *brd,
2498                 struct pci_dev *pdev)
2499 {
2500         struct mxser_port *info;
2501         unsigned int i;
2502         int retval;
2503
2504         printk(KERN_INFO "max. baud rate = %d bps.\n", brd->ports[0].max_baud);
2505
2506         for (i = 0; i < brd->info->nports; i++) {
2507                 info = &brd->ports[i];
2508                 tty_port_init(&info->port);
2509                 info->board = brd;
2510                 info->stop_rx = 0;
2511                 info->ldisc_stop_rx = 0;
2512
2513                 /* Enhance mode enabled here */
2514                 if (brd->chip_flag != MOXA_OTHER_UART)
2515                         mxser_enable_must_enchance_mode(info->ioaddr);
2516
2517                 info->port.flags = ASYNC_SHARE_IRQ;
2518                 info->type = brd->uart_type;
2519
2520                 process_txrx_fifo(info);
2521
2522                 info->custom_divisor = info->baud_base * 16;
2523                 info->port.close_delay = 5 * HZ / 10;
2524                 info->port.closing_wait = 30 * HZ;
2525                 info->normal_termios = mxvar_sdriver->init_termios;
2526                 init_waitqueue_head(&info->delta_msr_wait);
2527                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2528                 info->err_shadow = 0;
2529                 spin_lock_init(&info->slock);
2530
2531                 /* before set INT ISR, disable all int */
2532                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2533                         info->ioaddr + UART_IER);
2534         }
2535
2536         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2537                         brd);
2538         if (retval) {
2539                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2540                         "conflict with another device.\n",
2541                         brd->info->name, brd->irq);
2542                 /* We hold resources, we need to release them. */
2543                 mxser_release_res(brd, pdev, 0);
2544         }
2545         return retval;
2546 }
2547
2548 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2549 {
2550         int id, i, bits;
2551         unsigned short regs[16], irq;
2552         unsigned char scratch, scratch2;
2553
2554         brd->chip_flag = MOXA_OTHER_UART;
2555
2556         id = mxser_read_register(cap, regs);
2557         switch (id) {
2558         case C168_ASIC_ID:
2559                 brd->info = &mxser_cards[0];
2560                 break;
2561         case C104_ASIC_ID:
2562                 brd->info = &mxser_cards[1];
2563                 break;
2564         case CI104J_ASIC_ID:
2565                 brd->info = &mxser_cards[2];
2566                 break;
2567         case C102_ASIC_ID:
2568                 brd->info = &mxser_cards[5];
2569                 break;
2570         case CI132_ASIC_ID:
2571                 brd->info = &mxser_cards[6];
2572                 break;
2573         case CI134_ASIC_ID:
2574                 brd->info = &mxser_cards[7];
2575                 break;
2576         default:
2577                 return 0;
2578         }
2579
2580         irq = 0;
2581         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2582            Flag-hack checks if configuration should be read as 2-port here. */
2583         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2584                 irq = regs[9] & 0xF000;
2585                 irq = irq | (irq >> 4);
2586                 if (irq != (regs[9] & 0xFF00))
2587                         return MXSER_ERR_IRQ_CONFLIT;
2588         } else if (brd->info->nports == 4) {
2589                 irq = regs[9] & 0xF000;
2590                 irq = irq | (irq >> 4);
2591                 irq = irq | (irq >> 8);
2592                 if (irq != regs[9])
2593                         return MXSER_ERR_IRQ_CONFLIT;
2594         } else if (brd->info->nports == 8) {
2595                 irq = regs[9] & 0xF000;
2596                 irq = irq | (irq >> 4);
2597                 irq = irq | (irq >> 8);
2598                 if ((irq != regs[9]) || (irq != regs[10]))
2599                         return MXSER_ERR_IRQ_CONFLIT;
2600         }
2601
2602         if (!irq)
2603                 return MXSER_ERR_IRQ;
2604         brd->irq = ((int)(irq & 0xF000) >> 12);
2605         for (i = 0; i < 8; i++)
2606                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2607         if ((regs[12] & 0x80) == 0)
2608                 return MXSER_ERR_VECTOR;
2609         brd->vector = (int)regs[11];    /* interrupt vector */
2610         if (id == 1)
2611                 brd->vector_mask = 0x00FF;
2612         else
2613                 brd->vector_mask = 0x000F;
2614         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2615                 if (regs[12] & bits) {
2616                         brd->ports[i].baud_base = 921600;
2617                         brd->ports[i].max_baud = 921600;
2618                 } else {
2619                         brd->ports[i].baud_base = 115200;
2620                         brd->ports[i].max_baud = 115200;
2621                 }
2622         }
2623         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2624         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2625         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2626         outb(scratch2, cap + UART_LCR);
2627         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2628         scratch = inb(cap + UART_IIR);
2629
2630         if (scratch & 0xC0)
2631                 brd->uart_type = PORT_16550A;
2632         else
2633                 brd->uart_type = PORT_16450;
2634         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2635                         "mxser(IO)"))
2636                 return MXSER_ERR_IOADDR;
2637         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2638                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2639                 return MXSER_ERR_VECTOR;
2640         }
2641         return brd->info->nports;
2642 }
2643
2644 static int __devinit mxser_probe(struct pci_dev *pdev,
2645                 const struct pci_device_id *ent)
2646 {
2647 #ifdef CONFIG_PCI
2648         struct mxser_board *brd;
2649         unsigned int i, j;
2650         unsigned long ioaddress;
2651         int retval = -EINVAL;
2652
2653         for (i = 0; i < MXSER_BOARDS; i++)
2654                 if (mxser_boards[i].info == NULL)
2655                         break;
2656
2657         if (i >= MXSER_BOARDS) {
2658                 printk(KERN_ERR "Too many Smartio/Industio family boards found "
2659                         "(maximum %d), board not configured\n", MXSER_BOARDS);
2660                 goto err;
2661         }
2662
2663         brd = &mxser_boards[i];
2664         brd->idx = i * MXSER_PORTS_PER_BOARD;
2665         printk(KERN_INFO "Found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2666                 mxser_cards[ent->driver_data].name,
2667                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2668
2669         retval = pci_enable_device(pdev);
2670         if (retval) {
2671                 printk(KERN_ERR "Moxa SmartI/O PCI enable fail !\n");
2672                 goto err;
2673         }
2674
2675         /* io address */
2676         ioaddress = pci_resource_start(pdev, 2);
2677         retval = pci_request_region(pdev, 2, "mxser(IO)");
2678         if (retval)
2679                 goto err;
2680
2681         brd->info = &mxser_cards[ent->driver_data];
2682         for (i = 0; i < brd->info->nports; i++)
2683                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2684
2685         /* vector */
2686         ioaddress = pci_resource_start(pdev, 3);
2687         retval = pci_request_region(pdev, 3, "mxser(vector)");
2688         if (retval)
2689                 goto err_relio;
2690         brd->vector = ioaddress;
2691
2692         /* irq */
2693         brd->irq = pdev->irq;
2694
2695         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2696         brd->uart_type = PORT_16550A;
2697         brd->vector_mask = 0;
2698
2699         for (i = 0; i < brd->info->nports; i++) {
2700                 for (j = 0; j < UART_INFO_NUM; j++) {
2701                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2702                                 brd->ports[i].max_baud =
2703                                         Gpci_uart_info[j].max_baud;
2704
2705                                 /* exception....CP-102 */
2706                                 if (brd->info->flags & MXSER_HIGHBAUD)
2707                                         brd->ports[i].max_baud = 921600;
2708                                 break;
2709                         }
2710                 }
2711         }
2712
2713         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2714                 for (i = 0; i < brd->info->nports; i++) {
2715                         if (i < 4)
2716                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2717                         else
2718                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2719                 }
2720                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2721                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2722         }
2723
2724         for (i = 0; i < brd->info->nports; i++) {
2725                 brd->vector_mask |= (1 << i);
2726                 brd->ports[i].baud_base = 921600;
2727         }
2728
2729         /* mxser_initbrd will hook ISR. */
2730         retval = mxser_initbrd(brd, pdev);
2731         if (retval)
2732                 goto err_null;
2733
2734         for (i = 0; i < brd->info->nports; i++)
2735                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2736
2737         pci_set_drvdata(pdev, brd);
2738
2739         return 0;
2740 err_relio:
2741         pci_release_region(pdev, 2);
2742 err_null:
2743         brd->info = NULL;
2744 err:
2745         return retval;
2746 #else
2747         return -ENODEV;
2748 #endif
2749 }
2750
2751 static void __devexit mxser_remove(struct pci_dev *pdev)
2752 {
2753         struct mxser_board *brd = pci_get_drvdata(pdev);
2754         unsigned int i;
2755
2756         for (i = 0; i < brd->info->nports; i++)
2757                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2758
2759         mxser_release_res(brd, pdev, 1);
2760         brd->info = NULL;
2761 }
2762
2763 static struct pci_driver mxser_driver = {
2764         .name = "mxser",
2765         .id_table = mxser_pcibrds,
2766         .probe = mxser_probe,
2767         .remove = __devexit_p(mxser_remove)
2768 };
2769
2770 static int __init mxser_module_init(void)
2771 {
2772         struct mxser_board *brd;
2773         unsigned long cap;
2774         unsigned int i, m, isaloop;
2775         int retval, b;
2776
2777         pr_debug("Loading module mxser ...\n");
2778
2779         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2780         if (!mxvar_sdriver)
2781                 return -ENOMEM;
2782
2783         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2784                 MXSER_VERSION);
2785
2786         /* Initialize the tty_driver structure */
2787         mxvar_sdriver->owner = THIS_MODULE;
2788         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2789         mxvar_sdriver->name = "ttyMI";
2790         mxvar_sdriver->major = ttymajor;
2791         mxvar_sdriver->minor_start = 0;
2792         mxvar_sdriver->num = MXSER_PORTS + 1;
2793         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2794         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2795         mxvar_sdriver->init_termios = tty_std_termios;
2796         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2797         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2798         tty_set_operations(mxvar_sdriver, &mxser_ops);
2799
2800         retval = tty_register_driver(mxvar_sdriver);
2801         if (retval) {
2802                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2803                                 "tty driver !\n");
2804                 goto err_put;
2805         }
2806
2807         mxvar_diagflag = 0;
2808
2809         m = 0;
2810         /* Start finding ISA boards here */
2811         for (isaloop = 0; isaloop < 2; isaloop++)
2812                 for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
2813                         if (!isaloop)
2814                                 cap = mxserBoardCAP[b]; /* predefined */
2815                         else
2816                                 cap = ioaddr[b]; /* module param */
2817
2818                         if (!cap)
2819                                 continue;
2820
2821                         brd = &mxser_boards[m];
2822                         retval = mxser_get_ISA_conf(cap, brd);
2823
2824                         if (retval != 0)
2825                                 printk(KERN_INFO "Found MOXA %s board "
2826                                         "(CAP=0x%x)\n",
2827                                         brd->info->name, ioaddr[b]);
2828
2829                         if (retval <= 0) {
2830                                 if (retval == MXSER_ERR_IRQ)
2831                                         printk(KERN_ERR "Invalid interrupt "
2832                                                 "number, board not "
2833                                                 "configured\n");
2834                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
2835                                         printk(KERN_ERR "Invalid interrupt "
2836                                                 "number, board not "
2837                                                 "configured\n");
2838                                 else if (retval == MXSER_ERR_VECTOR)
2839                                         printk(KERN_ERR "Invalid interrupt "
2840                                                 "vector, board not "
2841                                                 "configured\n");
2842                                 else if (retval == MXSER_ERR_IOADDR)
2843                                         printk(KERN_ERR "Invalid I/O address, "
2844                                                 "board not configured\n");
2845
2846                                 brd->info = NULL;
2847                                 continue;
2848                         }
2849
2850                         /* mxser_initbrd will hook ISR. */
2851                         if (mxser_initbrd(brd, NULL) < 0) {
2852                                 brd->info = NULL;
2853                                 continue;
2854                         }
2855
2856                         brd->idx = m * MXSER_PORTS_PER_BOARD;
2857                         for (i = 0; i < brd->info->nports; i++)
2858                                 tty_register_device(mxvar_sdriver, brd->idx + i,
2859                                                 NULL);
2860
2861                         m++;
2862                 }
2863
2864         retval = pci_register_driver(&mxser_driver);
2865         if (retval) {
2866                 printk(KERN_ERR "Can't register pci driver\n");
2867                 if (!m) {
2868                         retval = -ENODEV;
2869                         goto err_unr;
2870                 } /* else: we have some ISA cards under control */
2871         }
2872
2873         pr_debug("Done.\n");
2874
2875         return 0;
2876 err_unr:
2877         tty_unregister_driver(mxvar_sdriver);
2878 err_put:
2879         put_tty_driver(mxvar_sdriver);
2880         return retval;
2881 }
2882
2883 static void __exit mxser_module_exit(void)
2884 {
2885         unsigned int i, j;
2886
2887         pr_debug("Unloading module mxser ...\n");
2888
2889         pci_unregister_driver(&mxser_driver);
2890
2891         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2892                 if (mxser_boards[i].info != NULL)
2893                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2894                                 tty_unregister_device(mxvar_sdriver,
2895                                                 mxser_boards[i].idx + j);
2896         tty_unregister_driver(mxvar_sdriver);
2897         put_tty_driver(mxvar_sdriver);
2898
2899         for (i = 0; i < MXSER_BOARDS; i++)
2900                 if (mxser_boards[i].info != NULL)
2901                         mxser_release_res(&mxser_boards[i], NULL, 1);
2902
2903         pr_debug("Done.\n");
2904 }
2905
2906 module_init(mxser_module_init);
2907 module_exit(mxser_module_exit);