SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
  18  *      - Fixed x86_64 cleanness
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/errno.h>
  23 #include <linux/signal.h>
  24 #include <linux/sched.h>
  25 #include <linux/timer.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/tty.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/serial.h>
  30 #include <linux/serial_reg.h>
  31 #include <linux/major.h>
  32 #include <linux/string.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/ptrace.h>
  35 #include <linux/gfp.h>
  36 #include <linux/ioport.h>
  37 #include <linux/mm.h>
  38 #include <linux/delay.h>
  39 #include <linux/pci.h>
  40 #include <linux/bitops.h>
  41
  42 #include <asm/system.h>
  43 #include <asm/io.h>
  44 #include <asm/irq.h>
  45 #include <asm/uaccess.h>
  46
  47 #include "mxser.h"
  48
  49 #define MXSER_VERSION   "2.0.4"         /* 1.12 */
  50 #define MXSERMAJOR       174
  51 #define MXSERCUMAJOR     175
  52
  53 #define MXSER_BOARDS            4       /* Max. boards */
  54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  56 #define MXSER_ISR_PASS_LIMIT    100
  57
  58 /*CheckIsMoxaMust return value*/
  59 #define MOXA_OTHER_UART         0x00
  60 #define MOXA_MUST_MU150_HWID    0x01
  61 #define MOXA_MUST_MU860_HWID    0x02
  62
  63 #define WAKEUP_CHARS            256
  64
  65 #define UART_MCR_AFE            0x20
  66 #define UART_LSR_SPECIAL        0x1E
  67
  68 #define PCI_DEVICE_ID_POS104UL  0x1044
  69 #define PCI_DEVICE_ID_CB108     0x1080
  70 #define PCI_DEVICE_ID_CP102UF   0x1023
  71 #define PCI_DEVICE_ID_CB114     0x1142
  72 #define PCI_DEVICE_ID_CP114UL   0x1143
  73 #define PCI_DEVICE_ID_CB134I    0x1341
  74 #define PCI_DEVICE_ID_CP138U    0x1380
  75
  76
  77 #define C168_ASIC_ID    1
  78 #define C104_ASIC_ID    2
  79 #define C102_ASIC_ID    0xB
  80 #define CI132_ASIC_ID   4
  81 #define CI134_ASIC_ID   3
  82 #define CI104J_ASIC_ID  5
  83
  84 #define MXSER_HIGHBAUD  1
  85 #define MXSER_HAS2      2
  86
  87 /* This is only for PCI */
  88 static const struct {
  89         int type;
  90         int tx_fifo;
  91         int rx_fifo;
  92         int xmit_fifo_size;
  93         int rx_high_water;
  94         int rx_trigger;
  95         int rx_low_water;
  96         long max_baud;
  97 } Gpci_uart_info[] = {
  98         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
  99         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 100         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 101 };
 102 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 103
 104 struct mxser_cardinfo {
 105         char *name;
 106         unsigned int nports;
 107         unsigned int flags;
 108 };
 109
 110 static const struct mxser_cardinfo mxser_cards[] = {
 111 /* 0*/  { "C168 series",        8, },
 112         { "C104 series",        4, },
 113         { "CI-104J series",     4, },
 114         { "C168H/PCI series",   8, },
 115         { "C104H/PCI series",   4, },
 116 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 117         { "CI-132 series",      4, MXSER_HAS2 },
 118         { "CI-134 series",      4, },
 119         { "CP-132 series",      2, },
 120         { "CP-114 series",      4, },
 121 /*10*/  { "CT-114 series",      4, },
 122         { "CP-102 series",      2, MXSER_HIGHBAUD },
 123         { "CP-104U series",     4, },
 124         { "CP-168U series",     8, },
 125         { "CP-132U series",     2, },
 126 /*15*/  { "CP-134U series",     4, },
 127         { "CP-104JU series",    4, },
 128         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 129         { "CP-118U series",     8, },
 130         { "CP-102UL series",    2, },
 131 /*20*/  { "CP-102U series",     2, },
 132         { "CP-118EL series",    8, },
 133         { "CP-168EL series",    8, },
 134         { "CP-104EL series",    4, },
 135         { "CB-108 series",      8, },
 136 /*25*/  { "CB-114 series",      4, },
 137         { "CB-134I series",     4, },
 138         { "CP-138U series",     8, },
 139         { "POS-104UL series",   4, },
 140         { "CP-114UL series",    4, },
 141 /*30*/  { "CP-102UF series",    2, }
 142 };
 143
 144 /* driver_data correspond to the lines in the structure above
 145    see also ISA probe function before you change something */
 146 static struct pci_device_id mxser_pcibrds[] = {
 147         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 148         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 172         { }
 173 };
 174 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 175
 176 static unsigned long ioaddr[MXSER_BOARDS];
 177 static int ttymajor = MXSERMAJOR;
 178
 179 /* Variables for insmod */
 180
 181 MODULE_AUTHOR("Casper Yang");
 182 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 183 module_param_array(ioaddr, ulong, NULL, 0);
 184 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 185 module_param(ttymajor, int, 0);
 186 MODULE_LICENSE("GPL");
 187
 188 struct mxser_log {
 189         int tick;
 190         unsigned long rxcnt[MXSER_PORTS];
 191         unsigned long txcnt[MXSER_PORTS];
 192 };
 193
 194
 195 struct mxser_mon {
 196         unsigned long rxcnt;
 197         unsigned long txcnt;
 198         unsigned long up_rxcnt;
 199         unsigned long up_txcnt;
 200         int modem_status;
 201         unsigned char hold_reason;
 202 };
 203
 204 struct mxser_mon_ext {
 205         unsigned long rx_cnt[32];
 206         unsigned long tx_cnt[32];
 207         unsigned long up_rxcnt[32];
 208         unsigned long up_txcnt[32];
 209         int modem_status[32];
 210
 211         long baudrate[32];
 212         int databits[32];
 213         int stopbits[32];
 214         int parity[32];
 215         int flowctrl[32];
 216         int fifo[32];
 217         int iftype[32];
 218 };
 219
 220 struct mxser_board;
 221
 222 struct mxser_port {
 223         struct tty_port port;
 224         struct mxser_board *board;
 225
 226         unsigned long ioaddr;
 227         unsigned long opmode_ioaddr;
 228         int max_baud;
 229
 230         int rx_high_water;
 231         int rx_trigger;         /* Rx fifo trigger level */
 232         int rx_low_water;
 233         int baud_base;          /* max. speed */
 234         int type;               /* UART type */
 235
 236         int x_char;             /* xon/xoff character */
 237         int IER;                /* Interrupt Enable Register */
 238         int MCR;                /* Modem control register */
 239
 240         unsigned char stop_rx;
 241         unsigned char ldisc_stop_rx;
 242
 243         int custom_divisor;
 244         unsigned char err_shadow;
 245
 246         struct async_icount icount; /* kernel counters for 4 input interrupts */
 247         int timeout;
 248
 249         int read_status_mask;
 250         int ignore_status_mask;
 251         int xmit_fifo_size;
 252         int xmit_head;
 253         int xmit_tail;
 254         int xmit_cnt;
 255
 256         struct ktermios normal_termios;
 257
 258         struct mxser_mon mon_data;
 259
 260         spinlock_t slock;
 261         wait_queue_head_t delta_msr_wait;
 262 };
 263
 264 struct mxser_board {
 265         unsigned int idx;
 266         int irq;
 267         const struct mxser_cardinfo *info;
 268         unsigned long vector;
 269         unsigned long vector_mask;
 270
 271         int chip_flag;
 272         int uart_type;
 273
 274         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 275 };
 276
 277 struct mxser_mstatus {
 278         tcflag_t cflag;
 279         int cts;
 280         int dsr;
 281         int ri;
 282         int dcd;
 283 };
 284
 285 static struct mxser_board mxser_boards[MXSER_BOARDS];
 286 static struct tty_driver *mxvar_sdriver;
 287 static struct mxser_log mxvar_log;
 288 static int mxser_set_baud_method[MXSER_PORTS + 1];
 289
 290 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 291 {
 292         u8 oldlcr;
 293         u8 efr;
 294
 295         oldlcr = inb(baseio + UART_LCR);
 296         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 297
 298         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 299         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 300
 301         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 302         outb(oldlcr, baseio + UART_LCR);
 303 }
 304
 305 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 306 {
 307         u8 oldlcr;
 308         u8 efr;
 309
 310         oldlcr = inb(baseio + UART_LCR);
 311         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 312
 313         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 314         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 315
 316         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 317         outb(oldlcr, baseio + UART_LCR);
 318 }
 319
 320 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 321 {
 322         u8 oldlcr;
 323         u8 efr;
 324
 325         oldlcr = inb(baseio + UART_LCR);
 326         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 327
 328         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 329         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 330         efr |= MOXA_MUST_EFR_BANK0;
 331
 332         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 333         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 334         outb(oldlcr, baseio + UART_LCR);
 335 }
 336
 337 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 338 {
 339         u8 oldlcr;
 340         u8 efr;
 341
 342         oldlcr = inb(baseio + UART_LCR);
 343         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 344
 345         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 346         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 347         efr |= MOXA_MUST_EFR_BANK0;
 348
 349         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 350         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 351         outb(oldlcr, baseio + UART_LCR);
 352 }
 353
 354 static void mxser_set_must_fifo_value(struct mxser_port *info)
 355 {
 356         u8 oldlcr;
 357         u8 efr;
 358
 359         oldlcr = inb(info->ioaddr + UART_LCR);
 360         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 361
 362         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 363         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 364         efr |= MOXA_MUST_EFR_BANK1;
 365
 366         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 367         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 368         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 369         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 370         outb(oldlcr, info->ioaddr + UART_LCR);
 371 }
 372
 373 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 374 {
 375         u8 oldlcr;
 376         u8 efr;
 377
 378         oldlcr = inb(baseio + UART_LCR);
 379         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 380
 381         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 382         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 383         efr |= MOXA_MUST_EFR_BANK2;
 384
 385         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 386         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 387         outb(oldlcr, baseio + UART_LCR);
 388 }
 389
 390 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 391 {
 392         u8 oldlcr;
 393         u8 efr;
 394
 395         oldlcr = inb(baseio + UART_LCR);
 396         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 397
 398         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 399         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 400         efr |= MOXA_MUST_EFR_BANK2;
 401
 402         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 403         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 404         outb(oldlcr, baseio + UART_LCR);
 405 }
 406
 407 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 408 {
 409         u8 oldlcr;
 410         u8 efr;
 411
 412         oldlcr = inb(baseio + UART_LCR);
 413         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 414
 415         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 416         efr &= ~MOXA_MUST_EFR_SF_MASK;
 417
 418         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 419         outb(oldlcr, baseio + UART_LCR);
 420 }
 421
 422 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 423 {
 424         u8 oldlcr;
 425         u8 efr;
 426
 427         oldlcr = inb(baseio + UART_LCR);
 428         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 429
 430         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 431         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 432         efr |= MOXA_MUST_EFR_SF_TX1;
 433
 434         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 435         outb(oldlcr, baseio + UART_LCR);
 436 }
 437
 438 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 439 {
 440         u8 oldlcr;
 441         u8 efr;
 442
 443         oldlcr = inb(baseio + UART_LCR);
 444         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 445
 446         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 447         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 448
 449         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 450         outb(oldlcr, baseio + UART_LCR);
 451 }
 452
 453 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 454 {
 455         u8 oldlcr;
 456         u8 efr;
 457
 458         oldlcr = inb(baseio + UART_LCR);
 459         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 460
 461         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 462         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 463         efr |= MOXA_MUST_EFR_SF_RX1;
 464
 465         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 466         outb(oldlcr, baseio + UART_LCR);
 467 }
 468
 469 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 470 {
 471         u8 oldlcr;
 472         u8 efr;
 473
 474         oldlcr = inb(baseio + UART_LCR);
 475         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 476
 477         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 478         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 479
 480         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 481         outb(oldlcr, baseio + UART_LCR);
 482 }
 483
 484 #ifdef CONFIG_PCI
 485 static int __devinit CheckIsMoxaMust(unsigned long io)
 486 {
 487         u8 oldmcr, hwid;
 488         int i;
 489
 490         outb(0, io + UART_LCR);
 491         mxser_disable_must_enchance_mode(io);
 492         oldmcr = inb(io + UART_MCR);
 493         outb(0, io + UART_MCR);
 494         mxser_set_must_xon1_value(io, 0x11);
 495         if ((hwid = inb(io + UART_MCR)) != 0) {
 496                 outb(oldmcr, io + UART_MCR);
 497                 return MOXA_OTHER_UART;
 498         }
 499
 500         mxser_get_must_hardware_id(io, &hwid);
 501         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 502                 if (hwid == Gpci_uart_info[i].type)
 503                         return (int)hwid;
 504         }
 505         return MOXA_OTHER_UART;
 506 }
 507 #endif
 508
 509 static void process_txrx_fifo(struct mxser_port *info)
 510 {
 511         int i;
 512
 513         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 514                 info->rx_trigger = 1;
 515                 info->rx_high_water = 1;
 516                 info->rx_low_water = 1;
 517                 info->xmit_fifo_size = 1;
 518         } else
 519                 for (i = 0; i < UART_INFO_NUM; i++)
 520                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 521                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 522                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 523                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 524                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 525                                 break;
 526                         }
 527 }
 528
 529 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 530 {
 531         static unsigned char mxser_msr[MXSER_PORTS + 1];
 532         unsigned char status = 0;
 533
 534         status = inb(baseaddr + UART_MSR);
 535
 536         mxser_msr[port] &= 0x0F;
 537         mxser_msr[port] |= status;
 538         status = mxser_msr[port];
 539         if (mode)
 540                 mxser_msr[port] = 0;
 541
 542         return status;
 543 }
 544
 545 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 546                 struct mxser_port *port)
 547 {
 548         DECLARE_WAITQUEUE(wait, current);
 549         int retval;
 550         int do_clocal = 0;
 551         unsigned long flags;
 552
 553         /*
 554          * If non-blocking mode is set, or the port is not enabled,
 555          * then make the check up front and then exit.
 556          */
 557         if ((filp->f_flags & O_NONBLOCK) ||
 558                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 559                 port->port.flags |= ASYNC_NORMAL_ACTIVE;
 560                 return 0;
 561         }
 562
 563         if (tty->termios->c_cflag & CLOCAL)
 564                 do_clocal = 1;
 565
 566         /*
 567          * Block waiting for the carrier detect and the line to become
 568          * free (i.e., not in use by the callout).  While we are in
 569          * this loop, port->port.count is dropped by one, so that
 570          * mxser_close() knows when to free things.  We restore it upon
 571          * exit, either normal or abnormal.
 572          */
 573         retval = 0;
 574         add_wait_queue(&port->port.open_wait, &wait);
 575
 576         spin_lock_irqsave(&port->slock, flags);
 577         if (!tty_hung_up_p(filp))
 578                 port->port.count--;
 579         spin_unlock_irqrestore(&port->slock, flags);
 580         port->port.blocked_open++;
 581         while (1) {
 582                 spin_lock_irqsave(&port->slock, flags);
 583                 outb(inb(port->ioaddr + UART_MCR) |
 584                         UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
 585                 spin_unlock_irqrestore(&port->slock, flags);
 586                 set_current_state(TASK_INTERRUPTIBLE);
 587                 if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
 588                         if (port->port.flags & ASYNC_HUP_NOTIFY)
 589                                 retval = -EAGAIN;
 590                         else
 591                                 retval = -ERESTARTSYS;
 592                         break;
 593                 }
 594                 if (!(port->port.flags & ASYNC_CLOSING) &&
 595                                 (do_clocal ||
 596                                 (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
 597                         break;
 598                 if (signal_pending(current)) {
 599                         retval = -ERESTARTSYS;
 600                         break;
 601                 }
 602                 schedule();
 603         }
 604         set_current_state(TASK_RUNNING);
 605         remove_wait_queue(&port->port.open_wait, &wait);
 606         if (!tty_hung_up_p(filp))
 607                 port->port.count++;
 608         port->port.blocked_open--;
 609         if (retval)
 610                 return retval;
 611         port->port.flags |= ASYNC_NORMAL_ACTIVE;
 612         return 0;
 613 }
 614
 615 static int mxser_set_baud(struct mxser_port *info, long newspd)
 616 {
 617         int quot = 0, baud;
 618         unsigned char cval;
 619
 620         if (!info->port.tty || !info->port.tty->termios)
 621                 return -1;
 622
 623         if (!(info->ioaddr))
 624                 return -1;
 625
 626         if (newspd > info->max_baud)
 627                 return -1;
 628
 629         if (newspd == 134) {
 630                 quot = 2 * info->baud_base / 269;
 631                 tty_encode_baud_rate(info->port.tty, 134, 134);
 632         } else if (newspd) {
 633                 quot = info->baud_base / newspd;
 634                 if (quot == 0)
 635                         quot = 1;
 636                 baud = info->baud_base/quot;
 637                 tty_encode_baud_rate(info->port.tty, baud, baud);
 638         } else {
 639                 quot = 0;
 640         }
 641
 642         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 643         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 644
 645         if (quot) {
 646                 info->MCR |= UART_MCR_DTR;
 647                 outb(info->MCR, info->ioaddr + UART_MCR);
 648         } else {
 649                 info->MCR &= ~UART_MCR_DTR;
 650                 outb(info->MCR, info->ioaddr + UART_MCR);
 651                 return 0;
 652         }
 653
 654         cval = inb(info->ioaddr + UART_LCR);
 655
 656         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 657
 658         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 659         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 660         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 661
 662 #ifdef BOTHER
 663         if (C_BAUD(info->port.tty) == BOTHER) {
 664                 quot = info->baud_base % newspd;
 665                 quot *= 8;
 666                 if (quot % newspd > newspd / 2) {
 667                         quot /= newspd;
 668                         quot++;
 669                 } else
 670                         quot /= newspd;
 671
 672                 mxser_set_must_enum_value(info->ioaddr, quot);
 673         } else
 674 #endif
 675                 mxser_set_must_enum_value(info->ioaddr, 0);
 676
 677         return 0;
 678 }
 679
 680 /*
 681  * This routine is called to set the UART divisor registers to match
 682  * the specified baud rate for a serial port.
 683  */
 684 static int mxser_change_speed(struct mxser_port *info,
 685                 struct ktermios *old_termios)
 686 {
 687         unsigned cflag, cval, fcr;
 688         int ret = 0;
 689         unsigned char status;
 690
 691         if (!info->port.tty || !info->port.tty->termios)
 692                 return ret;
 693         cflag = info->port.tty->termios->c_cflag;
 694         if (!(info->ioaddr))
 695                 return ret;
 696
 697         if (mxser_set_baud_method[info->port.tty->index] == 0)
 698                 mxser_set_baud(info, tty_get_baud_rate(info->port.tty));
 699
 700         /* byte size and parity */
 701         switch (cflag & CSIZE) {
 702         case CS5:
 703                 cval = 0x00;
 704                 break;
 705         case CS6:
 706                 cval = 0x01;
 707                 break;
 708         case CS7:
 709                 cval = 0x02;
 710                 break;
 711         case CS8:
 712                 cval = 0x03;
 713                 break;
 714         default:
 715                 cval = 0x00;
 716                 break;          /* too keep GCC shut... */
 717         }
 718         if (cflag & CSTOPB)
 719                 cval |= 0x04;
 720         if (cflag & PARENB)
 721                 cval |= UART_LCR_PARITY;
 722         if (!(cflag & PARODD))
 723                 cval |= UART_LCR_EPAR;
 724         if (cflag & CMSPAR)
 725                 cval |= UART_LCR_SPAR;
 726
 727         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 728                 if (info->board->chip_flag) {
 729                         fcr = UART_FCR_ENABLE_FIFO;
 730                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 731                         mxser_set_must_fifo_value(info);
 732                 } else
 733                         fcr = 0;
 734         } else {
 735                 fcr = UART_FCR_ENABLE_FIFO;
 736                 if (info->board->chip_flag) {
 737                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 738                         mxser_set_must_fifo_value(info);
 739                 } else {
 740                         switch (info->rx_trigger) {
 741                         case 1:
 742                                 fcr |= UART_FCR_TRIGGER_1;
 743                                 break;
 744                         case 4:
 745                                 fcr |= UART_FCR_TRIGGER_4;
 746                                 break;
 747                         case 8:
 748                                 fcr |= UART_FCR_TRIGGER_8;
 749                                 break;
 750                         default:
 751                                 fcr |= UART_FCR_TRIGGER_14;
 752                                 break;
 753                         }
 754                 }
 755         }
 756
 757         /* CTS flow control flag and modem status interrupts */
 758         info->IER &= ~UART_IER_MSI;
 759         info->MCR &= ~UART_MCR_AFE;
 760         if (cflag & CRTSCTS) {
 761                 info->port.flags |= ASYNC_CTS_FLOW;
 762                 info->IER |= UART_IER_MSI;
 763                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 764                         info->MCR |= UART_MCR_AFE;
 765                 } else {
 766                         status = inb(info->ioaddr + UART_MSR);
 767                         if (info->port.tty->hw_stopped) {
 768                                 if (status & UART_MSR_CTS) {
 769                                         info->port.tty->hw_stopped = 0;
 770                                         if (info->type != PORT_16550A &&
 771                                                         !info->board->chip_flag) {
 772                                                 outb(info->IER & ~UART_IER_THRI,
 773                                                         info->ioaddr +
 774                                                         UART_IER);
 775                                                 info->IER |= UART_IER_THRI;
 776                                                 outb(info->IER, info->ioaddr +
 777                                                                 UART_IER);
 778                                         }
 779                                         tty_wakeup(info->port.tty);
 780                                 }
 781                         } else {
 782                                 if (!(status & UART_MSR_CTS)) {
 783                                         info->port.tty->hw_stopped = 1;
 784                                         if ((info->type != PORT_16550A) &&
 785                                                         (!info->board->chip_flag)) {
 786                                                 info->IER &= ~UART_IER_THRI;
 787                                                 outb(info->IER, info->ioaddr +
 788                                                                 UART_IER);
 789                                         }
 790                                 }
 791                         }
 792                 }
 793         } else {
 794                 info->port.flags &= ~ASYNC_CTS_FLOW;
 795         }
 796         outb(info->MCR, info->ioaddr + UART_MCR);
 797         if (cflag & CLOCAL) {
 798                 info->port.flags &= ~ASYNC_CHECK_CD;
 799         } else {
 800                 info->port.flags |= ASYNC_CHECK_CD;
 801                 info->IER |= UART_IER_MSI;
 802         }
 803         outb(info->IER, info->ioaddr + UART_IER);
 804
 805         /*
 806          * Set up parity check flag
 807          */
 808         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 809         if (I_INPCK(info->port.tty))
 810                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 811         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
 812                 info->read_status_mask |= UART_LSR_BI;
 813
 814         info->ignore_status_mask = 0;
 815
 816         if (I_IGNBRK(info->port.tty)) {
 817                 info->ignore_status_mask |= UART_LSR_BI;
 818                 info->read_status_mask |= UART_LSR_BI;
 819                 /*
 820                  * If we're ignore parity and break indicators, ignore
 821                  * overruns too.  (For real raw support).
 822                  */
 823                 if (I_IGNPAR(info->port.tty)) {
 824                         info->ignore_status_mask |=
 825                                                 UART_LSR_OE |
 826                                                 UART_LSR_PE |
 827                                                 UART_LSR_FE;
 828                         info->read_status_mask |=
 829                                                 UART_LSR_OE |
 830                                                 UART_LSR_PE |
 831                                                 UART_LSR_FE;
 832                 }
 833         }
 834         if (info->board->chip_flag) {
 835                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(info->port.tty));
 836                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(info->port.tty));
 837                 if (I_IXON(info->port.tty)) {
 838                         mxser_enable_must_rx_software_flow_control(
 839                                         info->ioaddr);
 840                 } else {
 841                         mxser_disable_must_rx_software_flow_control(
 842                                         info->ioaddr);
 843                 }
 844                 if (I_IXOFF(info->port.tty)) {
 845                         mxser_enable_must_tx_software_flow_control(
 846                                         info->ioaddr);
 847                 } else {
 848                         mxser_disable_must_tx_software_flow_control(
 849                                         info->ioaddr);
 850                 }
 851         }
 852
 853
 854         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 855         outb(cval, info->ioaddr + UART_LCR);
 856
 857         return ret;
 858 }
 859
 860 static void mxser_check_modem_status(struct mxser_port *port, int status)
 861 {
 862         /* update input line counters */
 863         if (status & UART_MSR_TERI)
 864                 port->icount.rng++;
 865         if (status & UART_MSR_DDSR)
 866                 port->icount.dsr++;
 867         if (status & UART_MSR_DDCD)
 868                 port->icount.dcd++;
 869         if (status & UART_MSR_DCTS)
 870                 port->icount.cts++;
 871         port->mon_data.modem_status = status;
 872         wake_up_interruptible(&port->delta_msr_wait);
 873
 874         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 875                 if (status & UART_MSR_DCD)
 876                         wake_up_interruptible(&port->port.open_wait);
 877         }
 878
 879         if (port->port.flags & ASYNC_CTS_FLOW) {
 880                 if (port->port.tty->hw_stopped) {
 881                         if (status & UART_MSR_CTS) {
 882                                 port->port.tty->hw_stopped = 0;
 883
 884                                 if ((port->type != PORT_16550A) &&
 885                                                 (!port->board->chip_flag)) {
 886                                         outb(port->IER & ~UART_IER_THRI,
 887                                                 port->ioaddr + UART_IER);
 888                                         port->IER |= UART_IER_THRI;
 889                                         outb(port->IER, port->ioaddr +
 890                                                         UART_IER);
 891                                 }
 892                                 tty_wakeup(port->port.tty);
 893                         }
 894                 } else {
 895                         if (!(status & UART_MSR_CTS)) {
 896                                 port->port.tty->hw_stopped = 1;
 897                                 if (port->type != PORT_16550A &&
 898                                                 !port->board->chip_flag) {
 899                                         port->IER &= ~UART_IER_THRI;
 900                                         outb(port->IER, port->ioaddr +
 901                                                         UART_IER);
 902                                 }
 903                         }
 904                 }
 905         }
 906 }
 907
 908 static int mxser_startup(struct mxser_port *info)
 909 {
 910         unsigned long page;
 911         unsigned long flags;
 912
 913         page = __get_free_page(GFP_KERNEL);
 914         if (!page)
 915                 return -ENOMEM;
 916
 917         spin_lock_irqsave(&info->slock, flags);
 918
 919         if (info->port.flags & ASYNC_INITIALIZED) {
 920                 free_page(page);
 921                 spin_unlock_irqrestore(&info->slock, flags);
 922                 return 0;
 923         }
 924
 925         if (!info->ioaddr || !info->type) {
 926                 if (info->port.tty)
 927                         set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 928                 free_page(page);
 929                 spin_unlock_irqrestore(&info->slock, flags);
 930                 return 0;
 931         }
 932         if (info->port.xmit_buf)
 933                 free_page(page);
 934         else
 935                 info->port.xmit_buf = (unsigned char *) page;
 936
 937         /*
 938          * Clear the FIFO buffers and disable them
 939          * (they will be reenabled in mxser_change_speed())
 940          */
 941         if (info->board->chip_flag)
 942                 outb((UART_FCR_CLEAR_RCVR |
 943                         UART_FCR_CLEAR_XMIT |
 944                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 945         else
 946                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 947                         info->ioaddr + UART_FCR);
 948
 949         /*
 950          * At this point there's no way the LSR could still be 0xFF;
 951          * if it is, then bail out, because there's likely no UART
 952          * here.
 953          */
 954         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 955                 spin_unlock_irqrestore(&info->slock, flags);
 956                 if (capable(CAP_SYS_ADMIN)) {
 957                         if (info->port.tty)
 958                                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
 959                         return 0;
 960                 } else
 961                         return -ENODEV;
 962         }
 963
 964         /*
 965          * Clear the interrupt registers.
 966          */
 967         (void) inb(info->ioaddr + UART_LSR);
 968         (void) inb(info->ioaddr + UART_RX);
 969         (void) inb(info->ioaddr + UART_IIR);
 970         (void) inb(info->ioaddr + UART_MSR);
 971
 972         /*
 973          * Now, initialize the UART
 974          */
 975         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 976         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 977         outb(info->MCR, info->ioaddr + UART_MCR);
 978
 979         /*
 980          * Finally, enable interrupts
 981          */
 982         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 983
 984         if (info->board->chip_flag)
 985                 info->IER |= MOXA_MUST_IER_EGDAI;
 986         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 987
 988         /*
 989          * And clear the interrupt registers again for luck.
 990          */
 991         (void) inb(info->ioaddr + UART_LSR);
 992         (void) inb(info->ioaddr + UART_RX);
 993         (void) inb(info->ioaddr + UART_IIR);
 994         (void) inb(info->ioaddr + UART_MSR);
 995
 996         if (info->port.tty)
 997                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
 998         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 999
1000         /*
1001          * and set the speed of the serial port
1002          */
1003         mxser_change_speed(info, NULL);
1004         info->port.flags |= ASYNC_INITIALIZED;
1005         spin_unlock_irqrestore(&info->slock, flags);
1006
1007         return 0;
1008 }
1009
1010 /*
1011  * This routine will shutdown a serial port; interrupts maybe disabled, and
1012  * DTR is dropped if the hangup on close termio flag is on.
1013  */
1014 static void mxser_shutdown(struct mxser_port *info)
1015 {
1016         unsigned long flags;
1017
1018         if (!(info->port.flags & ASYNC_INITIALIZED))
1019                 return;
1020
1021         spin_lock_irqsave(&info->slock, flags);
1022
1023         /*
1024          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1025          * here so the queue might never be waken up
1026          */
1027         wake_up_interruptible(&info->delta_msr_wait);
1028
1029         /*
1030          * Free the IRQ, if necessary
1031          */
1032         if (info->port.xmit_buf) {
1033                 free_page((unsigned long) info->port.xmit_buf);
1034                 info->port.xmit_buf = NULL;
1035         }
1036
1037         info->IER = 0;
1038         outb(0x00, info->ioaddr + UART_IER);
1039
1040         if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
1041                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1042         outb(info->MCR, info->ioaddr + UART_MCR);
1043
1044         /* clear Rx/Tx FIFO's */
1045         if (info->board->chip_flag)
1046                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1047                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1048                                 info->ioaddr + UART_FCR);
1049         else
1050                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1051                         info->ioaddr + UART_FCR);
1052
1053         /* read data port to reset things */
1054         (void) inb(info->ioaddr + UART_RX);
1055
1056         if (info->port.tty)
1057                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1058
1059         info->port.flags &= ~ASYNC_INITIALIZED;
1060
1061         if (info->board->chip_flag)
1062                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1063
1064         spin_unlock_irqrestore(&info->slock, flags);
1065 }
1066
1067 /*
1068  * This routine is called whenever a serial port is opened.  It
1069  * enables interrupts for a serial port, linking in its async structure into
1070  * the IRQ chain.   It also performs the serial-specific
1071  * initialization for the tty structure.
1072  */
1073 static int mxser_open(struct tty_struct *tty, struct file *filp)
1074 {
1075         struct mxser_port *info;
1076         unsigned long flags;
1077         int retval, line;
1078
1079         line = tty->index;
1080         if (line == MXSER_PORTS)
1081                 return 0;
1082         if (line < 0 || line > MXSER_PORTS)
1083                 return -ENODEV;
1084         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1085         if (!info->ioaddr)
1086                 return -ENODEV;
1087
1088         tty->driver_data = info;
1089         info->port.tty = tty;
1090         /*
1091          * Start up serial port
1092          */
1093         spin_lock_irqsave(&info->slock, flags);
1094         info->port.count++;
1095         spin_unlock_irqrestore(&info->slock, flags);
1096         retval = mxser_startup(info);
1097         if (retval)
1098                 return retval;
1099
1100         retval = mxser_block_til_ready(tty, filp, info);
1101         if (retval)
1102                 return retval;
1103
1104         /* unmark here for very high baud rate (ex. 921600 bps) used */
1105         tty->low_latency = 1;
1106         return 0;
1107 }
1108
1109 static void mxser_flush_buffer(struct tty_struct *tty)
1110 {
1111         struct mxser_port *info = tty->driver_data;
1112         char fcr;
1113         unsigned long flags;
1114
1115
1116         spin_lock_irqsave(&info->slock, flags);
1117         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1118
1119         fcr = inb(info->ioaddr + UART_FCR);
1120         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1121                 info->ioaddr + UART_FCR);
1122         outb(fcr, info->ioaddr + UART_FCR);
1123
1124         spin_unlock_irqrestore(&info->slock, flags);
1125
1126         tty_wakeup(tty);
1127 }
1128
1129
1130 /*
1131  * This routine is called when the serial port gets closed.  First, we
1132  * wait for the last remaining data to be sent.  Then, we unlink its
1133  * async structure from the interrupt chain if necessary, and we free
1134  * that IRQ if nothing is left in the chain.
1135  */
1136 static void mxser_close(struct tty_struct *tty, struct file *filp)
1137 {
1138         struct mxser_port *info = tty->driver_data;
1139
1140         unsigned long timeout;
1141         unsigned long flags;
1142
1143         if (tty->index == MXSER_PORTS)
1144                 return;
1145         if (!info)
1146                 return;
1147
1148         spin_lock_irqsave(&info->slock, flags);
1149
1150         if (tty_hung_up_p(filp)) {
1151                 spin_unlock_irqrestore(&info->slock, flags);
1152                 return;
1153         }
1154         if ((tty->count == 1) && (info->port.count != 1)) {
1155                 /*
1156                  * Uh, oh.  tty->count is 1, which means that the tty
1157                  * structure will be freed.  Info->port.count should always
1158                  * be one in these conditions.  If it's greater than
1159                  * one, we've got real problems, since it means the
1160                  * serial port won't be shutdown.
1161                  */
1162                 printk(KERN_ERR "mxser_close: bad serial port count; "
1163                         "tty->count is 1, info->port.count is %d\n", info->port.count);
1164                 info->port.count = 1;
1165         }
1166         if (--info->port.count < 0) {
1167                 printk(KERN_ERR "mxser_close: bad serial port count for "
1168                         "ttys%d: %d\n", tty->index, info->port.count);
1169                 info->port.count = 0;
1170         }
1171         if (info->port.count) {
1172                 spin_unlock_irqrestore(&info->slock, flags);
1173                 return;
1174         }
1175         info->port.flags |= ASYNC_CLOSING;
1176         spin_unlock_irqrestore(&info->slock, flags);
1177         /*
1178          * Save the termios structure, since this port may have
1179          * separate termios for callout and dialin.
1180          */
1181         if (info->port.flags & ASYNC_NORMAL_ACTIVE)
1182                 info->normal_termios = *tty->termios;
1183         /*
1184          * Now we wait for the transmit buffer to clear; and we notify
1185          * the line discipline to only process XON/XOFF characters.
1186          */
1187         tty->closing = 1;
1188         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1189                 tty_wait_until_sent(tty, info->port.closing_wait);
1190         /*
1191          * At this point we stop accepting input.  To do this, we
1192          * disable the receive line status interrupts, and tell the
1193          * interrupt driver to stop checking the data ready bit in the
1194          * line status register.
1195          */
1196         info->IER &= ~UART_IER_RLSI;
1197         if (info->board->chip_flag)
1198                 info->IER &= ~MOXA_MUST_RECV_ISR;
1199
1200         if (info->port.flags & ASYNC_INITIALIZED) {
1201                 outb(info->IER, info->ioaddr + UART_IER);
1202                 /*
1203                  * Before we drop DTR, make sure the UART transmitter
1204                  * has completely drained; this is especially
1205                  * important if there is a transmit FIFO!
1206                  */
1207                 timeout = jiffies + HZ;
1208                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1209                         schedule_timeout_interruptible(5);
1210                         if (time_after(jiffies, timeout))
1211                                 break;
1212                 }
1213         }
1214         mxser_shutdown(info);
1215
1216         mxser_flush_buffer(tty);
1217         tty_ldisc_flush(tty);
1218
1219         tty->closing = 0;
1220         info->port.tty = NULL;
1221         if (info->port.blocked_open) {
1222                 if (info->port.close_delay)
1223                         schedule_timeout_interruptible(info->port.close_delay);
1224                 wake_up_interruptible(&info->port.open_wait);
1225         }
1226
1227         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1228 }
1229
1230 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1231 {
1232         int c, total = 0;
1233         struct mxser_port *info = tty->driver_data;
1234         unsigned long flags;
1235
1236         if (!info->port.xmit_buf)
1237                 return 0;
1238
1239         while (1) {
1240                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1241                                           SERIAL_XMIT_SIZE - info->xmit_head));
1242                 if (c <= 0)
1243                         break;
1244
1245                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1246                 spin_lock_irqsave(&info->slock, flags);
1247                 info->xmit_head = (info->xmit_head + c) &
1248                                   (SERIAL_XMIT_SIZE - 1);
1249                 info->xmit_cnt += c;
1250                 spin_unlock_irqrestore(&info->slock, flags);
1251
1252                 buf += c;
1253                 count -= c;
1254                 total += c;
1255         }
1256
1257         if (info->xmit_cnt && !tty->stopped) {
1258                 if (!tty->hw_stopped ||
1259                                 (info->type == PORT_16550A) ||
1260                                 (info->board->chip_flag)) {
1261                         spin_lock_irqsave(&info->slock, flags);
1262                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1263                                         UART_IER);
1264                         info->IER |= UART_IER_THRI;
1265                         outb(info->IER, info->ioaddr + UART_IER);
1266                         spin_unlock_irqrestore(&info->slock, flags);
1267                 }
1268         }
1269         return total;
1270 }
1271
1272 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1273 {
1274         struct mxser_port *info = tty->driver_data;
1275         unsigned long flags;
1276
1277         if (!info->port.xmit_buf)
1278                 return 0;
1279
1280         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1281                 return 0;
1282
1283         spin_lock_irqsave(&info->slock, flags);
1284         info->port.xmit_buf[info->xmit_head++] = ch;
1285         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1286         info->xmit_cnt++;
1287         spin_unlock_irqrestore(&info->slock, flags);
1288         if (!tty->stopped) {
1289                 if (!tty->hw_stopped ||
1290                                 (info->type == PORT_16550A) ||
1291                                 info->board->chip_flag) {
1292                         spin_lock_irqsave(&info->slock, flags);
1293                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1294                         info->IER |= UART_IER_THRI;
1295                         outb(info->IER, info->ioaddr + UART_IER);
1296                         spin_unlock_irqrestore(&info->slock, flags);
1297                 }
1298         }
1299         return 1;
1300 }
1301
1302
1303 static void mxser_flush_chars(struct tty_struct *tty)
1304 {
1305         struct mxser_port *info = tty->driver_data;
1306         unsigned long flags;
1307
1308         if (info->xmit_cnt <= 0 ||
1309                         tty->stopped ||
1310                         !info->port.xmit_buf ||
1311                         (tty->hw_stopped &&
1312                          (info->type != PORT_16550A) &&
1313                          (!info->board->chip_flag)
1314                         ))
1315                 return;
1316
1317         spin_lock_irqsave(&info->slock, flags);
1318
1319         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1320         info->IER |= UART_IER_THRI;
1321         outb(info->IER, info->ioaddr + UART_IER);
1322
1323         spin_unlock_irqrestore(&info->slock, flags);
1324 }
1325
1326 static int mxser_write_room(struct tty_struct *tty)
1327 {
1328         struct mxser_port *info = tty->driver_data;
1329         int ret;
1330
1331         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1332         if (ret < 0)
1333                 ret = 0;
1334         return ret;
1335 }
1336
1337 static int mxser_chars_in_buffer(struct tty_struct *tty)
1338 {
1339         struct mxser_port *info = tty->driver_data;
1340         return info->xmit_cnt;
1341 }
1342
1343 /*
1344  * ------------------------------------------------------------
1345  * friends of mxser_ioctl()
1346  * ------------------------------------------------------------
1347  */
1348 static int mxser_get_serial_info(struct mxser_port *info,
1349                 struct serial_struct __user *retinfo)
1350 {
1351         struct serial_struct tmp = {
1352                 .type = info->type,
1353                 .line = info->port.tty->index,
1354                 .port = info->ioaddr,
1355                 .irq = info->board->irq,
1356                 .flags = info->port.flags,
1357                 .baud_base = info->baud_base,
1358                 .close_delay = info->port.close_delay,
1359                 .closing_wait = info->port.closing_wait,
1360                 .custom_divisor = info->custom_divisor,
1361                 .hub6 = 0
1362         };
1363         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1364                 return -EFAULT;
1365         return 0;
1366 }
1367
1368 static int mxser_set_serial_info(struct mxser_port *info,
1369                 struct serial_struct __user *new_info)
1370 {
1371         struct serial_struct new_serial;
1372         speed_t baud;
1373         unsigned long sl_flags;
1374         unsigned int flags;
1375         int retval = 0;
1376
1377         if (!new_info || !info->ioaddr)
1378                 return -ENODEV;
1379         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1380                 return -EFAULT;
1381
1382         if (new_serial.irq != info->board->irq ||
1383                         new_serial.port != info->ioaddr)
1384                 return -EINVAL;
1385
1386         flags = info->port.flags & ASYNC_SPD_MASK;
1387
1388         if (!capable(CAP_SYS_ADMIN)) {
1389                 if ((new_serial.baud_base != info->baud_base) ||
1390                                 (new_serial.close_delay != info->port.close_delay) ||
1391                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1392                         return -EPERM;
1393                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1394                                 (new_serial.flags & ASYNC_USR_MASK));
1395         } else {
1396                 /*
1397                  * OK, past this point, all the error checking has been done.
1398                  * At this point, we start making changes.....
1399                  */
1400                 info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
1401                                 (new_serial.flags & ASYNC_FLAGS));
1402                 info->port.close_delay = new_serial.close_delay * HZ / 100;
1403                 info->port.closing_wait = new_serial.closing_wait * HZ / 100;
1404                 info->port.tty->low_latency =
1405                                 (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1406                 if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1407                                 (new_serial.baud_base != info->baud_base ||
1408                                 new_serial.custom_divisor !=
1409                                 info->custom_divisor)) {
1410                         baud = new_serial.baud_base / new_serial.custom_divisor;
1411                         tty_encode_baud_rate(info->port.tty, baud, baud);
1412                 }
1413         }
1414
1415         info->type = new_serial.type;
1416
1417         process_txrx_fifo(info);
1418
1419         if (info->port.flags & ASYNC_INITIALIZED) {
1420                 if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
1421                         spin_lock_irqsave(&info->slock, sl_flags);
1422                         mxser_change_speed(info, NULL);
1423                         spin_unlock_irqrestore(&info->slock, sl_flags);
1424                 }
1425         } else
1426                 retval = mxser_startup(info);
1427
1428         return retval;
1429 }
1430
1431 /*
1432  * mxser_get_lsr_info - get line status register info
1433  *
1434  * Purpose: Let user call ioctl() to get info when the UART physically
1435  *          is emptied.  On bus types like RS485, the transmitter must
1436  *          release the bus after transmitting. This must be done when
1437  *          the transmit shift register is empty, not be done when the
1438  *          transmit holding register is empty.  This functionality
1439  *          allows an RS485 driver to be written in user space.
1440  */
1441 static int mxser_get_lsr_info(struct mxser_port *info,
1442                 unsigned int __user *value)
1443 {
1444         unsigned char status;
1445         unsigned int result;
1446         unsigned long flags;
1447
1448         spin_lock_irqsave(&info->slock, flags);
1449         status = inb(info->ioaddr + UART_LSR);
1450         spin_unlock_irqrestore(&info->slock, flags);
1451         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1452         return put_user(result, value);
1453 }
1454
1455 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1456 {
1457         struct mxser_port *info = tty->driver_data;
1458         unsigned char control, status;
1459         unsigned long flags;
1460
1461
1462         if (tty->index == MXSER_PORTS)
1463                 return -ENOIOCTLCMD;
1464         if (test_bit(TTY_IO_ERROR, &tty->flags))
1465                 return -EIO;
1466
1467         control = info->MCR;
1468
1469         spin_lock_irqsave(&info->slock, flags);
1470         status = inb(info->ioaddr + UART_MSR);
1471         if (status & UART_MSR_ANY_DELTA)
1472                 mxser_check_modem_status(info, status);
1473         spin_unlock_irqrestore(&info->slock, flags);
1474         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1475                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1476                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1477                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1478                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1479                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1480 }
1481
1482 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1483                 unsigned int set, unsigned int clear)
1484 {
1485         struct mxser_port *info = tty->driver_data;
1486         unsigned long flags;
1487
1488
1489         if (tty->index == MXSER_PORTS)
1490                 return -ENOIOCTLCMD;
1491         if (test_bit(TTY_IO_ERROR, &tty->flags))
1492                 return -EIO;
1493
1494         spin_lock_irqsave(&info->slock, flags);
1495
1496         if (set & TIOCM_RTS)
1497                 info->MCR |= UART_MCR_RTS;
1498         if (set & TIOCM_DTR)
1499                 info->MCR |= UART_MCR_DTR;
1500
1501         if (clear & TIOCM_RTS)
1502                 info->MCR &= ~UART_MCR_RTS;
1503         if (clear & TIOCM_DTR)
1504                 info->MCR &= ~UART_MCR_DTR;
1505
1506         outb(info->MCR, info->ioaddr + UART_MCR);
1507         spin_unlock_irqrestore(&info->slock, flags);
1508         return 0;
1509 }
1510
1511 static int __init mxser_program_mode(int port)
1512 {
1513         int id, i, j, n;
1514
1515         outb(0, port);
1516         outb(0, port);
1517         outb(0, port);
1518         (void)inb(port);
1519         (void)inb(port);
1520         outb(0, port);
1521         (void)inb(port);
1522
1523         id = inb(port + 1) & 0x1F;
1524         if ((id != C168_ASIC_ID) &&
1525                         (id != C104_ASIC_ID) &&
1526                         (id != C102_ASIC_ID) &&
1527                         (id != CI132_ASIC_ID) &&
1528                         (id != CI134_ASIC_ID) &&
1529                         (id != CI104J_ASIC_ID))
1530                 return -1;
1531         for (i = 0, j = 0; i < 4; i++) {
1532                 n = inb(port + 2);
1533                 if (n == 'M') {
1534                         j = 1;
1535                 } else if ((j == 1) && (n == 1)) {
1536                         j = 2;
1537                         break;
1538                 } else
1539                         j = 0;
1540         }
1541         if (j != 2)
1542                 id = -2;
1543         return id;
1544 }
1545
1546 static void __init mxser_normal_mode(int port)
1547 {
1548         int i, n;
1549
1550         outb(0xA5, port + 1);
1551         outb(0x80, port + 3);
1552         outb(12, port + 0);     /* 9600 bps */
1553         outb(0, port + 1);
1554         outb(0x03, port + 3);   /* 8 data bits */
1555         outb(0x13, port + 4);   /* loop back mode */
1556         for (i = 0; i < 16; i++) {
1557                 n = inb(port + 5);
1558                 if ((n & 0x61) == 0x60)
1559                         break;
1560                 if ((n & 1) == 1)
1561                         (void)inb(port);
1562         }
1563         outb(0x00, port + 4);
1564 }
1565
1566 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1567 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1568 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1569 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1570 #define EN_CCMD         0x000   /* Chip's command register     */
1571 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1572 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1573 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1574 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1575 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1576 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1577 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1578 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1579 static int __init mxser_read_register(int port, unsigned short *regs)
1580 {
1581         int i, k, value, id;
1582         unsigned int j;
1583
1584         id = mxser_program_mode(port);
1585         if (id < 0)
1586                 return id;
1587         for (i = 0; i < 14; i++) {
1588                 k = (i & 0x3F) | 0x180;
1589                 for (j = 0x100; j > 0; j >>= 1) {
1590                         outb(CHIP_CS, port);
1591                         if (k & j) {
1592                                 outb(CHIP_CS | CHIP_DO, port);
1593                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1594                         } else {
1595                                 outb(CHIP_CS, port);
1596                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1597                         }
1598                 }
1599                 (void)inb(port);
1600                 value = 0;
1601                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1602                         outb(CHIP_CS, port);
1603                         outb(CHIP_CS | CHIP_SK, port);
1604                         if (inb(port) & CHIP_DI)
1605                                 value |= j;
1606                 }
1607                 regs[i] = value;
1608                 outb(0, port);
1609         }
1610         mxser_normal_mode(port);
1611         return id;
1612 }
1613
1614 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1615 {
1616         struct mxser_port *port;
1617         int result, status;
1618         unsigned int i, j;
1619         int ret = 0;
1620
1621         switch (cmd) {
1622         case MOXA_GET_MAJOR:
1623                 printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl %x, fix "
1624                                 "your userspace\n", current->comm, cmd);
1625                 return put_user(ttymajor, (int __user *)argp);
1626
1627         case MOXA_CHKPORTENABLE:
1628                 result = 0;
1629                 lock_kernel();
1630                 for (i = 0; i < MXSER_BOARDS; i++)
1631                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1632                                 if (mxser_boards[i].ports[j].ioaddr)
1633                                         result |= (1 << i);
1634                 unlock_kernel();
1635                 return put_user(result, (unsigned long __user *)argp);
1636         case MOXA_GETDATACOUNT:
1637                 lock_kernel();
1638                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1639                         ret = -EFAULT;
1640                 unlock_kernel();
1641                 return ret;
1642         case MOXA_GETMSTATUS: {
1643                 struct mxser_mstatus ms, __user *msu = argp;
1644                 lock_kernel();
1645                 for (i = 0; i < MXSER_BOARDS; i++)
1646                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1647                                 port = &mxser_boards[i].ports[j];
1648                                 memset(&ms, 0, sizeof(ms));
1649
1650                                 if (!port->ioaddr)
1651                                         goto copy;
1652
1653                                 if (!port->port.tty || !port->port.tty->termios)
1654                                         ms.cflag = port->normal_termios.c_cflag;
1655                                 else
1656                                         ms.cflag = port->port.tty->termios->c_cflag;
1657
1658                                 status = inb(port->ioaddr + UART_MSR);
1659                                 if (status & UART_MSR_DCD)
1660                                         ms.dcd = 1;
1661                                 if (status & UART_MSR_DSR)
1662                                         ms.dsr = 1;
1663                                 if (status & UART_MSR_CTS)
1664                                         ms.cts = 1;
1665                         copy:
1666                                 if (copy_to_user(msu, &ms, sizeof(ms))) {
1667                                         unlock_kernel();
1668                                         return -EFAULT;
1669                                 }
1670                                 msu++;
1671                         }
1672                 unlock_kernel();
1673                 return 0;
1674         }
1675         case MOXA_ASPP_MON_EXT: {
1676                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1677                 unsigned int cflag, iflag, p;
1678                 u8 opmode;
1679
1680                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1681                 if (!me)
1682                         return -ENOMEM;
1683
1684                 lock_kernel();
1685                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1686                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1687                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1688                                         i = MXSER_BOARDS;
1689                                         break;
1690                                 }
1691                                 port = &mxser_boards[i].ports[j];
1692                                 if (!port->ioaddr)
1693                                         continue;
1694
1695                                 status = mxser_get_msr(port->ioaddr, 0, p);
1696
1697                                 if (status & UART_MSR_TERI)
1698                                         port->icount.rng++;
1699                                 if (status & UART_MSR_DDSR)
1700                                         port->icount.dsr++;
1701                                 if (status & UART_MSR_DDCD)
1702                                         port->icount.dcd++;
1703                                 if (status & UART_MSR_DCTS)
1704                                         port->icount.cts++;
1705
1706                                 port->mon_data.modem_status = status;
1707                                 me->rx_cnt[p] = port->mon_data.rxcnt;
1708                                 me->tx_cnt[p] = port->mon_data.txcnt;
1709                                 me->up_rxcnt[p] = port->mon_data.up_rxcnt;
1710                                 me->up_txcnt[p] = port->mon_data.up_txcnt;
1711                                 me->modem_status[p] =
1712                                         port->mon_data.modem_status;
1713                                 me->baudrate[p] = tty_get_baud_rate(port->port.tty);
1714
1715                                 if (!port->port.tty || !port->port.tty->termios) {
1716                                         cflag = port->normal_termios.c_cflag;
1717                                         iflag = port->normal_termios.c_iflag;
1718                                 } else {
1719                                         cflag = port->port.tty->termios->c_cflag;
1720                                         iflag = port->port.tty->termios->c_iflag;
1721                                 }
1722
1723                                 me->databits[p] = cflag & CSIZE;
1724                                 me->stopbits[p] = cflag & CSTOPB;
1725                                 me->parity[p] = cflag & (PARENB | PARODD |
1726                                                 CMSPAR);
1727
1728                                 if (cflag & CRTSCTS)
1729                                         me->flowctrl[p] |= 0x03;
1730
1731                                 if (iflag & (IXON | IXOFF))
1732                                         me->flowctrl[p] |= 0x0C;
1733
1734                                 if (port->type == PORT_16550A)
1735                                         me->fifo[p] = 1;
1736
1737                                 opmode = inb(port->opmode_ioaddr) >>
1738                                                 ((p % 4) * 2);
1739                                 opmode &= OP_MODE_MASK;
1740                                 me->iftype[p] = opmode;
1741                         }
1742                 }
1743                 unlock_kernel();
1744                 if (copy_to_user(argp, me, sizeof(*me)))
1745                         ret = -EFAULT;
1746                 kfree(me);
1747                 return ret;
1748         }
1749         default:
1750                 return -ENOIOCTLCMD;
1751         }
1752         return 0;
1753 }
1754
1755 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1756                 struct async_icount *cprev)
1757 {
1758         struct async_icount cnow;
1759         unsigned long flags;
1760         int ret;
1761
1762         spin_lock_irqsave(&info->slock, flags);
1763         cnow = info->icount;    /* atomic copy */
1764         spin_unlock_irqrestore(&info->slock, flags);
1765
1766         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1767                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1768                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1769                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1770
1771         *cprev = cnow;
1772
1773         return ret;
1774 }
1775
1776 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1777                 unsigned int cmd, unsigned long arg)
1778 {
1779         struct mxser_port *info = tty->driver_data;
1780         struct async_icount cnow;
1781         unsigned long flags;
1782         void __user *argp = (void __user *)arg;
1783         int retval;
1784
1785         if (tty->index == MXSER_PORTS)
1786                 return mxser_ioctl_special(cmd, argp);
1787
1788         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1789                 int p;
1790                 unsigned long opmode;
1791                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1792                 int shiftbit;
1793                 unsigned char val, mask;
1794
1795                 p = tty->index % 4;
1796                 if (cmd == MOXA_SET_OP_MODE) {
1797                         if (get_user(opmode, (int __user *) argp))
1798                                 return -EFAULT;
1799                         if (opmode != RS232_MODE &&
1800                                         opmode != RS485_2WIRE_MODE &&
1801                                         opmode != RS422_MODE &&
1802                                         opmode != RS485_4WIRE_MODE)
1803                                 return -EFAULT;
1804                         lock_kernel();
1805                         mask = ModeMask[p];
1806                         shiftbit = p * 2;
1807                         val = inb(info->opmode_ioaddr);
1808                         val &= mask;
1809                         val |= (opmode << shiftbit);
1810                         outb(val, info->opmode_ioaddr);
1811                         unlock_kernel();
1812                 } else {
1813                         lock_kernel();
1814                         shiftbit = p * 2;
1815                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1816                         opmode &= OP_MODE_MASK;
1817                         unlock_kernel();
1818                         if (put_user(opmode, (int __user *)argp))
1819                                 return -EFAULT;
1820                 }
1821                 return 0;
1822         }
1823
1824         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1825                         test_bit(TTY_IO_ERROR, &tty->flags))
1826                 return -EIO;
1827
1828         switch (cmd) {
1829         case TIOCGSERIAL:
1830                 lock_kernel();
1831                 retval = mxser_get_serial_info(info, argp);
1832                 unlock_kernel();
1833                 return retval;
1834         case TIOCSSERIAL:
1835                 lock_kernel();
1836                 retval = mxser_set_serial_info(info, argp);
1837                 unlock_kernel();
1838                 return retval;
1839         case TIOCSERGETLSR:     /* Get line status register */
1840                 return  mxser_get_lsr_info(info, argp);
1841                 /*
1842                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1843                  * - mask passed in arg for lines of interest
1844                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1845                  * Caller should use TIOCGICOUNT to see which one it was
1846                  */
1847         case TIOCMIWAIT:
1848                 spin_lock_irqsave(&info->slock, flags);
1849                 cnow = info->icount;    /* note the counters on entry */
1850                 spin_unlock_irqrestore(&info->slock, flags);
1851
1852                 return wait_event_interruptible(info->delta_msr_wait,
1853                                 mxser_cflags_changed(info, arg, &cnow));
1854         /*
1855          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1856          * Return: write counters to the user passed counter struct
1857          * NB: both 1->0 and 0->1 transitions are counted except for
1858          *     RI where only 0->1 is counted.
1859          */
1860         case TIOCGICOUNT: {
1861                 struct serial_icounter_struct icnt = { 0 };
1862                 spin_lock_irqsave(&info->slock, flags);
1863                 cnow = info->icount;
1864                 spin_unlock_irqrestore(&info->slock, flags);
1865
1866                 icnt.frame = cnow.frame;
1867                 icnt.brk = cnow.brk;
1868                 icnt.overrun = cnow.overrun;
1869                 icnt.buf_overrun = cnow.buf_overrun;
1870                 icnt.parity = cnow.parity;
1871                 icnt.rx = cnow.rx;
1872                 icnt.tx = cnow.tx;
1873                 icnt.cts = cnow.cts;
1874                 icnt.dsr = cnow.dsr;
1875                 icnt.rng = cnow.rng;
1876                 icnt.dcd = cnow.dcd;
1877
1878                 return copy_to_user(argp, &icnt, sizeof(icnt)) ? -EFAULT : 0;
1879         }
1880         case MOXA_HighSpeedOn:
1881                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1882         case MOXA_SDS_RSTICOUNTER:
1883                 lock_kernel();
1884                 info->mon_data.rxcnt = 0;
1885                 info->mon_data.txcnt = 0;
1886                 unlock_kernel();
1887                 return 0;
1888
1889         case MOXA_ASPP_OQUEUE:{
1890                 int len, lsr;
1891
1892                 lock_kernel();
1893                 len = mxser_chars_in_buffer(tty);
1894                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1895                 len += (lsr ? 0 : 1);
1896                 unlock_kernel();
1897
1898                 return put_user(len, (int __user *)argp);
1899         }
1900         case MOXA_ASPP_MON: {
1901                 int mcr, status;
1902
1903                 lock_kernel();
1904                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1905                 mxser_check_modem_status(info, status);
1906
1907                 mcr = inb(info->ioaddr + UART_MCR);
1908                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1909                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1910                 else
1911                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1912
1913                 if (mcr & MOXA_MUST_MCR_TX_XON)
1914                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1915                 else
1916                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1917
1918                 if (info->port.tty->hw_stopped)
1919                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1920                 else
1921                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1922                 unlock_kernel();
1923                 if (copy_to_user(argp, &info->mon_data,
1924                                 sizeof(struct mxser_mon)))
1925                         return -EFAULT;
1926
1927                 return 0;
1928         }
1929         case MOXA_ASPP_LSTATUS: {
1930                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1931                         return -EFAULT;
1932
1933                 info->err_shadow = 0;
1934                 return 0;
1935         }
1936         case MOXA_SET_BAUD_METHOD: {
1937                 int method;
1938
1939                 if (get_user(method, (int __user *)argp))
1940                         return -EFAULT;
1941                 mxser_set_baud_method[tty->index] = method;
1942                 return put_user(method, (int __user *)argp);
1943         }
1944         default:
1945                 return -ENOIOCTLCMD;
1946         }
1947         return 0;
1948 }
1949
1950 static void mxser_stoprx(struct tty_struct *tty)
1951 {
1952         struct mxser_port *info = tty->driver_data;
1953
1954         info->ldisc_stop_rx = 1;
1955         if (I_IXOFF(tty)) {
1956                 if (info->board->chip_flag) {
1957                         info->IER &= ~MOXA_MUST_RECV_ISR;
1958                         outb(info->IER, info->ioaddr + UART_IER);
1959                 } else {
1960                         info->x_char = STOP_CHAR(tty);
1961                         outb(0, info->ioaddr + UART_IER);
1962                         info->IER |= UART_IER_THRI;
1963                         outb(info->IER, info->ioaddr + UART_IER);
1964                 }
1965         }
1966
1967         if (info->port.tty->termios->c_cflag & CRTSCTS) {
1968                 info->MCR &= ~UART_MCR_RTS;
1969                 outb(info->MCR, info->ioaddr + UART_MCR);
1970         }
1971 }
1972
1973 /*
1974  * This routine is called by the upper-layer tty layer to signal that
1975  * incoming characters should be throttled.
1976  */
1977 static void mxser_throttle(struct tty_struct *tty)
1978 {
1979         mxser_stoprx(tty);
1980 }
1981
1982 static void mxser_unthrottle(struct tty_struct *tty)
1983 {
1984         struct mxser_port *info = tty->driver_data;
1985
1986         /* startrx */
1987         info->ldisc_stop_rx = 0;
1988         if (I_IXOFF(tty)) {
1989                 if (info->x_char)
1990                         info->x_char = 0;
1991                 else {
1992                         if (info->board->chip_flag) {
1993                                 info->IER |= MOXA_MUST_RECV_ISR;
1994                                 outb(info->IER, info->ioaddr + UART_IER);
1995                         } else {
1996                                 info->x_char = START_CHAR(tty);
1997                                 outb(0, info->ioaddr + UART_IER);
1998                                 info->IER |= UART_IER_THRI;
1999                                 outb(info->IER, info->ioaddr + UART_IER);
2000                         }
2001                 }
2002         }
2003
2004         if (info->port.tty->termios->c_cflag & CRTSCTS) {
2005                 info->MCR |= UART_MCR_RTS;
2006                 outb(info->MCR, info->ioaddr + UART_MCR);
2007         }
2008 }
2009
2010 /*
2011  * mxser_stop() and mxser_start()
2012  *
2013  * This routines are called before setting or resetting tty->stopped.
2014  * They enable or disable transmitter interrupts, as necessary.
2015  */
2016 static void mxser_stop(struct tty_struct *tty)
2017 {
2018         struct mxser_port *info = tty->driver_data;
2019         unsigned long flags;
2020
2021         spin_lock_irqsave(&info->slock, flags);
2022         if (info->IER & UART_IER_THRI) {
2023                 info->IER &= ~UART_IER_THRI;
2024                 outb(info->IER, info->ioaddr + UART_IER);
2025         }
2026         spin_unlock_irqrestore(&info->slock, flags);
2027 }
2028
2029 static void mxser_start(struct tty_struct *tty)
2030 {
2031         struct mxser_port *info = tty->driver_data;
2032         unsigned long flags;
2033
2034         spin_lock_irqsave(&info->slock, flags);
2035         if (info->xmit_cnt && info->port.xmit_buf) {
2036                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2037                 info->IER |= UART_IER_THRI;
2038                 outb(info->IER, info->ioaddr + UART_IER);
2039         }
2040         spin_unlock_irqrestore(&info->slock, flags);
2041 }
2042
2043 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2044 {
2045         struct mxser_port *info = tty->driver_data;
2046         unsigned long flags;
2047
2048         spin_lock_irqsave(&info->slock, flags);
2049         mxser_change_speed(info, old_termios);
2050         spin_unlock_irqrestore(&info->slock, flags);
2051
2052         if ((old_termios->c_cflag & CRTSCTS) &&
2053                         !(tty->termios->c_cflag & CRTSCTS)) {
2054                 tty->hw_stopped = 0;
2055                 mxser_start(tty);
2056         }
2057
2058         /* Handle sw stopped */
2059         if ((old_termios->c_iflag & IXON) &&
2060                         !(tty->termios->c_iflag & IXON)) {
2061                 tty->stopped = 0;
2062
2063                 if (info->board->chip_flag) {
2064                         spin_lock_irqsave(&info->slock, flags);
2065                         mxser_disable_must_rx_software_flow_control(
2066                                         info->ioaddr);
2067                         spin_unlock_irqrestore(&info->slock, flags);
2068                 }
2069
2070                 mxser_start(tty);
2071         }
2072 }
2073
2074 /*
2075  * mxser_wait_until_sent() --- wait until the transmitter is empty
2076  */
2077 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2078 {
2079         struct mxser_port *info = tty->driver_data;
2080         unsigned long orig_jiffies, char_time;
2081         int lsr;
2082
2083         if (info->type == PORT_UNKNOWN)
2084                 return;
2085
2086         if (info->xmit_fifo_size == 0)
2087                 return;         /* Just in case.... */
2088
2089         orig_jiffies = jiffies;
2090         /*
2091          * Set the check interval to be 1/5 of the estimated time to
2092          * send a single character, and make it at least 1.  The check
2093          * interval should also be less than the timeout.
2094          *
2095          * Note: we have to use pretty tight timings here to satisfy
2096          * the NIST-PCTS.
2097          */
2098         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2099         char_time = char_time / 5;
2100         if (char_time == 0)
2101                 char_time = 1;
2102         if (timeout && timeout < char_time)
2103                 char_time = timeout;
2104         /*
2105          * If the transmitter hasn't cleared in twice the approximate
2106          * amount of time to send the entire FIFO, it probably won't
2107          * ever clear.  This assumes the UART isn't doing flow
2108          * control, which is currently the case.  Hence, if it ever
2109          * takes longer than info->timeout, this is probably due to a
2110          * UART bug of some kind.  So, we clamp the timeout parameter at
2111          * 2*info->timeout.
2112          */
2113         if (!timeout || timeout > 2 * info->timeout)
2114                 timeout = 2 * info->timeout;
2115 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2116         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2117                 timeout, char_time);
2118         printk("jiff=%lu...", jiffies);
2119 #endif
2120         lock_kernel();
2121         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2122 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2123                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2124 #endif
2125                 schedule_timeout_interruptible(char_time);
2126                 if (signal_pending(current))
2127                         break;
2128                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2129                         break;
2130         }
2131         set_current_state(TASK_RUNNING);
2132         unlock_kernel();
2133
2134 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2135         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2136 #endif
2137 }
2138
2139 /*
2140  * This routine is called by tty_hangup() when a hangup is signaled.
2141  */
2142 static void mxser_hangup(struct tty_struct *tty)
2143 {
2144         struct mxser_port *info = tty->driver_data;
2145
2146         mxser_flush_buffer(tty);
2147         mxser_shutdown(info);
2148         info->port.count = 0;
2149         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2150         info->port.tty = NULL;
2151         wake_up_interruptible(&info->port.open_wait);
2152 }
2153
2154 /*
2155  * mxser_rs_break() --- routine which turns the break handling on or off
2156  */
2157 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2158 {
2159         struct mxser_port *info = tty->driver_data;
2160         unsigned long flags;
2161
2162         spin_lock_irqsave(&info->slock, flags);
2163         if (break_state == -1)
2164                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2165                         info->ioaddr + UART_LCR);
2166         else
2167                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2168                         info->ioaddr + UART_LCR);
2169         spin_unlock_irqrestore(&info->slock, flags);
2170         return 0;
2171 }
2172
2173 static void mxser_receive_chars(struct mxser_port *port, int *status)
2174 {
2175         struct tty_struct *tty = port->port.tty;
2176         unsigned char ch, gdl;
2177         int ignored = 0;
2178         int cnt = 0;
2179         int recv_room;
2180         int max = 256;
2181
2182         recv_room = tty->receive_room;
2183         if ((recv_room == 0) && (!port->ldisc_stop_rx))
2184                 mxser_stoprx(tty);
2185
2186         if (port->board->chip_flag != MOXA_OTHER_UART) {
2187
2188                 if (*status & UART_LSR_SPECIAL)
2189                         goto intr_old;
2190                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2191                                 (*status & MOXA_MUST_LSR_RERR))
2192                         goto intr_old;
2193                 if (*status & MOXA_MUST_LSR_RERR)
2194                         goto intr_old;
2195
2196                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2197
2198                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2199                         gdl &= MOXA_MUST_GDL_MASK;
2200                 if (gdl >= recv_room) {
2201                         if (!port->ldisc_stop_rx)
2202                                 mxser_stoprx(tty);
2203                 }
2204                 while (gdl--) {
2205                         ch = inb(port->ioaddr + UART_RX);
2206                         tty_insert_flip_char(tty, ch, 0);
2207                         cnt++;
2208                 }
2209                 goto end_intr;
2210         }
2211 intr_old:
2212
2213         do {
2214                 if (max-- < 0)
2215                         break;
2216
2217                 ch = inb(port->ioaddr + UART_RX);
2218                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2219                         outb(0x23, port->ioaddr + UART_FCR);
2220                 *status &= port->read_status_mask;
2221                 if (*status & port->ignore_status_mask) {
2222                         if (++ignored > 100)
2223                                 break;
2224                 } else {
2225                         char flag = 0;
2226                         if (*status & UART_LSR_SPECIAL) {
2227                                 if (*status & UART_LSR_BI) {
2228                                         flag = TTY_BREAK;
2229                                         port->icount.brk++;
2230
2231                                         if (port->port.flags & ASYNC_SAK)
2232                                                 do_SAK(tty);
2233                                 } else if (*status & UART_LSR_PE) {
2234                                         flag = TTY_PARITY;
2235                                         port->icount.parity++;
2236                                 } else if (*status & UART_LSR_FE) {
2237                                         flag = TTY_FRAME;
2238                                         port->icount.frame++;
2239                                 } else if (*status & UART_LSR_OE) {
2240                                         flag = TTY_OVERRUN;
2241                                         port->icount.overrun++;
2242                                 } else
2243                                         flag = TTY_BREAK;
2244                         }
2245                         tty_insert_flip_char(tty, ch, flag);
2246                         cnt++;
2247                         if (cnt >= recv_room) {
2248                                 if (!port->ldisc_stop_rx)
2249                                         mxser_stoprx(tty);
2250                                 break;
2251                         }
2252
2253                 }
2254
2255                 if (port->board->chip_flag)
2256                         break;
2257
2258                 *status = inb(port->ioaddr + UART_LSR);
2259         } while (*status & UART_LSR_DR);
2260
2261 end_intr:
2262         mxvar_log.rxcnt[port->port.tty->index] += cnt;
2263         port->mon_data.rxcnt += cnt;
2264         port->mon_data.up_rxcnt += cnt;
2265
2266         /*
2267          * We are called from an interrupt context with &port->slock
2268          * being held. Drop it temporarily in order to prevent
2269          * recursive locking.
2270          */
2271         spin_unlock(&port->slock);
2272         tty_flip_buffer_push(tty);
2273         spin_lock(&port->slock);
2274 }
2275
2276 static void mxser_transmit_chars(struct mxser_port *port)
2277 {
2278         int count, cnt;
2279
2280         if (port->x_char) {
2281                 outb(port->x_char, port->ioaddr + UART_TX);
2282                 port->x_char = 0;
2283                 mxvar_log.txcnt[port->port.tty->index]++;
2284                 port->mon_data.txcnt++;
2285                 port->mon_data.up_txcnt++;
2286                 port->icount.tx++;
2287                 return;
2288         }
2289
2290         if (port->port.xmit_buf == NULL)
2291                 return;
2292
2293         if ((port->xmit_cnt <= 0) || port->port.tty->stopped ||
2294                         (port->port.tty->hw_stopped &&
2295                         (port->type != PORT_16550A) &&
2296                         (!port->board->chip_flag))) {
2297                 port->IER &= ~UART_IER_THRI;
2298                 outb(port->IER, port->ioaddr + UART_IER);
2299                 return;
2300         }
2301
2302         cnt = port->xmit_cnt;
2303         count = port->xmit_fifo_size;
2304         do {
2305                 outb(port->port.xmit_buf[port->xmit_tail++],
2306                         port->ioaddr + UART_TX);
2307                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2308                 if (--port->xmit_cnt <= 0)
2309                         break;
2310         } while (--count > 0);
2311         mxvar_log.txcnt[port->port.tty->index] += (cnt - port->xmit_cnt);
2312
2313         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2314         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2315         port->icount.tx += (cnt - port->xmit_cnt);
2316
2317         if (port->xmit_cnt < WAKEUP_CHARS)
2318                 tty_wakeup(port->port.tty);
2319
2320         if (port->xmit_cnt <= 0) {
2321                 port->IER &= ~UART_IER_THRI;
2322                 outb(port->IER, port->ioaddr + UART_IER);
2323         }
2324 }
2325
2326 /*
2327  * This is the serial driver's generic interrupt routine
2328  */
2329 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2330 {
2331         int status, iir, i;
2332         struct mxser_board *brd = NULL;
2333         struct mxser_port *port;
2334         int max, irqbits, bits, msr;
2335         unsigned int int_cnt, pass_counter = 0;
2336         int handled = IRQ_NONE;
2337
2338         for (i = 0; i < MXSER_BOARDS; i++)
2339                 if (dev_id == &mxser_boards[i]) {
2340                         brd = dev_id;
2341                         break;
2342                 }
2343
2344         if (i == MXSER_BOARDS)
2345                 goto irq_stop;
2346         if (brd == NULL)
2347                 goto irq_stop;
2348         max = brd->info->nports;
2349         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2350                 irqbits = inb(brd->vector) & brd->vector_mask;
2351                 if (irqbits == brd->vector_mask)
2352                         break;
2353
2354                 handled = IRQ_HANDLED;
2355                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2356                         if (irqbits == brd->vector_mask)
2357                                 break;
2358                         if (bits & irqbits)
2359                                 continue;
2360                         port = &brd->ports[i];
2361
2362                         int_cnt = 0;
2363                         spin_lock(&port->slock);
2364                         do {
2365                                 iir = inb(port->ioaddr + UART_IIR);
2366                                 if (iir & UART_IIR_NO_INT)
2367                                         break;
2368                                 iir &= MOXA_MUST_IIR_MASK;
2369                                 if (!port->port.tty ||
2370                                                 (port->port.flags & ASYNC_CLOSING) ||
2371                                                 !(port->port.flags &
2372                                                         ASYNC_INITIALIZED)) {
2373                                         status = inb(port->ioaddr + UART_LSR);
2374                                         outb(0x27, port->ioaddr + UART_FCR);
2375                                         inb(port->ioaddr + UART_MSR);
2376                                         break;
2377                                 }
2378
2379                                 status = inb(port->ioaddr + UART_LSR);
2380
2381                                 if (status & UART_LSR_PE)
2382                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2383                                 if (status & UART_LSR_FE)
2384                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2385                                 if (status & UART_LSR_OE)
2386                                         port->err_shadow |=
2387                                                 NPPI_NOTIFY_HW_OVERRUN;
2388                                 if (status & UART_LSR_BI)
2389                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2390
2391                                 if (port->board->chip_flag) {
2392                                         if (iir == MOXA_MUST_IIR_GDA ||
2393                                             iir == MOXA_MUST_IIR_RDA ||
2394                                             iir == MOXA_MUST_IIR_RTO ||
2395                                             iir == MOXA_MUST_IIR_LSR)
2396                                                 mxser_receive_chars(port,
2397                                                                 &status);
2398
2399                                 } else {
2400                                         status &= port->read_status_mask;
2401                                         if (status & UART_LSR_DR)
2402                                                 mxser_receive_chars(port,
2403                                                                 &status);
2404                                 }
2405                                 msr = inb(port->ioaddr + UART_MSR);
2406                                 if (msr & UART_MSR_ANY_DELTA)
2407                                         mxser_check_modem_status(port, msr);
2408
2409                                 if (port->board->chip_flag) {
2410                                         if (iir == 0x02 && (status &
2411                                                                 UART_LSR_THRE))
2412                                                 mxser_transmit_chars(port);
2413                                 } else {
2414                                         if (status & UART_LSR_THRE)
2415                                                 mxser_transmit_chars(port);
2416                                 }
2417                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2418                         spin_unlock(&port->slock);
2419                 }
2420         }
2421
2422 irq_stop:
2423         return handled;
2424 }
2425
2426 static const struct tty_operations mxser_ops = {
2427         .open = mxser_open,
2428         .close = mxser_close,
2429         .write = mxser_write,
2430         .put_char = mxser_put_char,
2431         .flush_chars = mxser_flush_chars,
2432         .write_room = mxser_write_room,
2433         .chars_in_buffer = mxser_chars_in_buffer,
2434         .flush_buffer = mxser_flush_buffer,
2435         .ioctl = mxser_ioctl,
2436         .throttle = mxser_throttle,
2437         .unthrottle = mxser_unthrottle,
2438         .set_termios = mxser_set_termios,
2439         .stop = mxser_stop,
2440         .start = mxser_start,
2441         .hangup = mxser_hangup,
2442         .break_ctl = mxser_rs_break,
2443         .wait_until_sent = mxser_wait_until_sent,
2444         .tiocmget = mxser_tiocmget,
2445         .tiocmset = mxser_tiocmset,
2446 };
2447
2448 /*
2449  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2450  */
2451
2452 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2453                 unsigned int irq)
2454 {
2455         if (irq)
2456                 free_irq(brd->irq, brd);
2457         if (pdev != NULL) {     /* PCI */
2458 #ifdef CONFIG_PCI
2459                 pci_release_region(pdev, 2);
2460                 pci_release_region(pdev, 3);
2461 #endif
2462         } else {
2463                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2464                 release_region(brd->vector, 1);
2465         }
2466 }
2467
2468 static int __devinit mxser_initbrd(struct mxser_board *brd,
2469                 struct pci_dev *pdev)
2470 {
2471         struct mxser_port *info;
2472         unsigned int i;
2473         int retval;
2474
2475         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2476                         brd->ports[0].max_baud);
2477
2478         for (i = 0; i < brd->info->nports; i++) {
2479                 info = &brd->ports[i];
2480                 tty_port_init(&info->port);
2481                 info->board = brd;
2482                 info->stop_rx = 0;
2483                 info->ldisc_stop_rx = 0;
2484
2485                 /* Enhance mode enabled here */
2486                 if (brd->chip_flag != MOXA_OTHER_UART)
2487                         mxser_enable_must_enchance_mode(info->ioaddr);
2488
2489                 info->port.flags = ASYNC_SHARE_IRQ;
2490                 info->type = brd->uart_type;
2491
2492                 process_txrx_fifo(info);
2493
2494                 info->custom_divisor = info->baud_base * 16;
2495                 info->port.close_delay = 5 * HZ / 10;
2496                 info->port.closing_wait = 30 * HZ;
2497                 info->normal_termios = mxvar_sdriver->init_termios;
2498                 init_waitqueue_head(&info->delta_msr_wait);
2499                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2500                 info->err_shadow = 0;
2501                 spin_lock_init(&info->slock);
2502
2503                 /* before set INT ISR, disable all int */
2504                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2505                         info->ioaddr + UART_IER);
2506         }
2507
2508         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2509                         brd);
2510         if (retval) {
2511                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2512                         "conflict with another device.\n",
2513                         brd->info->name, brd->irq);
2514                 /* We hold resources, we need to release them. */
2515                 mxser_release_res(brd, pdev, 0);
2516         }
2517         return retval;
2518 }
2519
2520 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2521 {
2522         int id, i, bits;
2523         unsigned short regs[16], irq;
2524         unsigned char scratch, scratch2;
2525
2526         brd->chip_flag = MOXA_OTHER_UART;
2527
2528         id = mxser_read_register(cap, regs);
2529         switch (id) {
2530         case C168_ASIC_ID:
2531                 brd->info = &mxser_cards[0];
2532                 break;
2533         case C104_ASIC_ID:
2534                 brd->info = &mxser_cards[1];
2535                 break;
2536         case CI104J_ASIC_ID:
2537                 brd->info = &mxser_cards[2];
2538                 break;
2539         case C102_ASIC_ID:
2540                 brd->info = &mxser_cards[5];
2541                 break;
2542         case CI132_ASIC_ID:
2543                 brd->info = &mxser_cards[6];
2544                 break;
2545         case CI134_ASIC_ID:
2546                 brd->info = &mxser_cards[7];
2547                 break;
2548         default:
2549                 return 0;
2550         }
2551
2552         irq = 0;
2553         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2554            Flag-hack checks if configuration should be read as 2-port here. */
2555         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2556                 irq = regs[9] & 0xF000;
2557                 irq = irq | (irq >> 4);
2558                 if (irq != (regs[9] & 0xFF00))
2559                         goto err_irqconflict;
2560         } else if (brd->info->nports == 4) {
2561                 irq = regs[9] & 0xF000;
2562                 irq = irq | (irq >> 4);
2563                 irq = irq | (irq >> 8);
2564                 if (irq != regs[9])
2565                         goto err_irqconflict;
2566         } else if (brd->info->nports == 8) {
2567                 irq = regs[9] & 0xF000;
2568                 irq = irq | (irq >> 4);
2569                 irq = irq | (irq >> 8);
2570                 if ((irq != regs[9]) || (irq != regs[10]))
2571                         goto err_irqconflict;
2572         }
2573
2574         if (!irq) {
2575                 printk(KERN_ERR "mxser: interrupt number unset\n");
2576                 return -EIO;
2577         }
2578         brd->irq = ((int)(irq & 0xF000) >> 12);
2579         for (i = 0; i < 8; i++)
2580                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2581         if ((regs[12] & 0x80) == 0) {
2582                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2583                 return -EIO;
2584         }
2585         brd->vector = (int)regs[11];    /* interrupt vector */
2586         if (id == 1)
2587                 brd->vector_mask = 0x00FF;
2588         else
2589                 brd->vector_mask = 0x000F;
2590         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2591                 if (regs[12] & bits) {
2592                         brd->ports[i].baud_base = 921600;
2593                         brd->ports[i].max_baud = 921600;
2594                 } else {
2595                         brd->ports[i].baud_base = 115200;
2596                         brd->ports[i].max_baud = 115200;
2597                 }
2598         }
2599         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2600         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2601         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2602         outb(scratch2, cap + UART_LCR);
2603         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2604         scratch = inb(cap + UART_IIR);
2605
2606         if (scratch & 0xC0)
2607                 brd->uart_type = PORT_16550A;
2608         else
2609                 brd->uart_type = PORT_16450;
2610         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2611                         "mxser(IO)")) {
2612                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2613                                 "0x%.8lx-0x%.8lx\n",
2614                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2615                                 8 * brd->info->nports - 1);
2616                 return -EIO;
2617         }
2618         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2619                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2620                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2621                                 "0x%.8lx-0x%.8lx\n",
2622                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2623                                 8 * brd->info->nports - 1);
2624                 return -EIO;
2625         }
2626         return brd->info->nports;
2627
2628 err_irqconflict:
2629         printk(KERN_ERR "mxser: invalid interrupt number\n");
2630         return -EIO;
2631 }
2632
2633 static int __devinit mxser_probe(struct pci_dev *pdev,
2634                 const struct pci_device_id *ent)
2635 {
2636 #ifdef CONFIG_PCI
2637         struct mxser_board *brd;
2638         unsigned int i, j;
2639         unsigned long ioaddress;
2640         int retval = -EINVAL;
2641
2642         for (i = 0; i < MXSER_BOARDS; i++)
2643                 if (mxser_boards[i].info == NULL)
2644                         break;
2645
2646         if (i >= MXSER_BOARDS) {
2647                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2648                                 "not configured\n", MXSER_BOARDS);
2649                 goto err;
2650         }
2651
2652         brd = &mxser_boards[i];
2653         brd->idx = i * MXSER_PORTS_PER_BOARD;
2654         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2655                 mxser_cards[ent->driver_data].name,
2656                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2657
2658         retval = pci_enable_device(pdev);
2659         if (retval) {
2660                 dev_err(&pdev->dev, "PCI enable failed\n");
2661                 goto err;
2662         }
2663
2664         /* io address */
2665         ioaddress = pci_resource_start(pdev, 2);
2666         retval = pci_request_region(pdev, 2, "mxser(IO)");
2667         if (retval)
2668                 goto err;
2669
2670         brd->info = &mxser_cards[ent->driver_data];
2671         for (i = 0; i < brd->info->nports; i++)
2672                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2673
2674         /* vector */
2675         ioaddress = pci_resource_start(pdev, 3);
2676         retval = pci_request_region(pdev, 3, "mxser(vector)");
2677         if (retval)
2678                 goto err_relio;
2679         brd->vector = ioaddress;
2680
2681         /* irq */
2682         brd->irq = pdev->irq;
2683
2684         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2685         brd->uart_type = PORT_16550A;
2686         brd->vector_mask = 0;
2687
2688         for (i = 0; i < brd->info->nports; i++) {
2689                 for (j = 0; j < UART_INFO_NUM; j++) {
2690                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2691                                 brd->ports[i].max_baud =
2692                                         Gpci_uart_info[j].max_baud;
2693
2694                                 /* exception....CP-102 */
2695                                 if (brd->info->flags & MXSER_HIGHBAUD)
2696                                         brd->ports[i].max_baud = 921600;
2697                                 break;
2698                         }
2699                 }
2700         }
2701
2702         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2703                 for (i = 0; i < brd->info->nports; i++) {
2704                         if (i < 4)
2705                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2706                         else
2707                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2708                 }
2709                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2710                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2711         }
2712
2713         for (i = 0; i < brd->info->nports; i++) {
2714                 brd->vector_mask |= (1 << i);
2715                 brd->ports[i].baud_base = 921600;
2716         }
2717
2718         /* mxser_initbrd will hook ISR. */
2719         retval = mxser_initbrd(brd, pdev);
2720         if (retval)
2721                 goto err_null;
2722
2723         for (i = 0; i < brd->info->nports; i++)
2724                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2725
2726         pci_set_drvdata(pdev, brd);
2727
2728         return 0;
2729 err_relio:
2730         pci_release_region(pdev, 2);
2731 err_null:
2732         brd->info = NULL;
2733 err:
2734         return retval;
2735 #else
2736         return -ENODEV;
2737 #endif
2738 }
2739
2740 static void __devexit mxser_remove(struct pci_dev *pdev)
2741 {
2742         struct mxser_board *brd = pci_get_drvdata(pdev);
2743         unsigned int i;
2744
2745         for (i = 0; i < brd->info->nports; i++)
2746                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2747
2748         mxser_release_res(brd, pdev, 1);
2749         brd->info = NULL;
2750 }
2751
2752 static struct pci_driver mxser_driver = {
2753         .name = "mxser",
2754         .id_table = mxser_pcibrds,
2755         .probe = mxser_probe,
2756         .remove = __devexit_p(mxser_remove)
2757 };
2758
2759 static int __init mxser_module_init(void)
2760 {
2761         struct mxser_board *brd;
2762         unsigned int b, i, m;
2763         int retval;
2764
2765         pr_debug("Loading module mxser ...\n");
2766
2767         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2768         if (!mxvar_sdriver)
2769                 return -ENOMEM;
2770
2771         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2772                 MXSER_VERSION);
2773
2774         /* Initialize the tty_driver structure */
2775         mxvar_sdriver->owner = THIS_MODULE;
2776         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2777         mxvar_sdriver->name = "ttyMI";
2778         mxvar_sdriver->major = ttymajor;
2779         mxvar_sdriver->minor_start = 0;
2780         mxvar_sdriver->num = MXSER_PORTS + 1;
2781         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2782         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2783         mxvar_sdriver->init_termios = tty_std_termios;
2784         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2785         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2786         tty_set_operations(mxvar_sdriver, &mxser_ops);
2787
2788         retval = tty_register_driver(mxvar_sdriver);
2789         if (retval) {
2790                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2791                                 "tty driver !\n");
2792                 goto err_put;
2793         }
2794
2795         /* Start finding ISA boards here */
2796         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2797                 if (!ioaddr[b])
2798                         continue;
2799
2800                 brd = &mxser_boards[m];
2801                 retval = mxser_get_ISA_conf(!ioaddr[b], brd);
2802                 if (retval <= 0) {
2803                         brd->info = NULL;
2804                         continue;
2805                 }
2806
2807                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2808                                 brd->info->name, ioaddr[b]);
2809
2810                 /* mxser_initbrd will hook ISR. */
2811                 if (mxser_initbrd(brd, NULL) < 0) {
2812                         brd->info = NULL;
2813                         continue;
2814                 }
2815
2816                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2817                 for (i = 0; i < brd->info->nports; i++)
2818                         tty_register_device(mxvar_sdriver, brd->idx + i, NULL);
2819
2820                 m++;
2821         }
2822
2823         retval = pci_register_driver(&mxser_driver);
2824         if (retval) {
2825                 printk(KERN_ERR "mxser: can't register pci driver\n");
2826                 if (!m) {
2827                         retval = -ENODEV;
2828                         goto err_unr;
2829                 } /* else: we have some ISA cards under control */
2830         }
2831
2832         pr_debug("Done.\n");
2833
2834         return 0;
2835 err_unr:
2836         tty_unregister_driver(mxvar_sdriver);
2837 err_put:
2838         put_tty_driver(mxvar_sdriver);
2839         return retval;
2840 }
2841
2842 static void __exit mxser_module_exit(void)
2843 {
2844         unsigned int i, j;
2845
2846         pr_debug("Unloading module mxser ...\n");
2847
2848         pci_unregister_driver(&mxser_driver);
2849
2850         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2851                 if (mxser_boards[i].info != NULL)
2852                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2853                                 tty_unregister_device(mxvar_sdriver,
2854                                                 mxser_boards[i].idx + j);
2855         tty_unregister_driver(mxvar_sdriver);
2856         put_tty_driver(mxvar_sdriver);
2857
2858         for (i = 0; i < MXSER_BOARDS; i++)
2859                 if (mxser_boards[i].info != NULL)
2860                         mxser_release_res(&mxser_boards[i], NULL, 1);
2861
2862         pr_debug("Done.\n");
2863 }
2864
2865 module_init(mxser_module_init);
2866 module_exit(mxser_module_exit);