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@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
  18  *      www.moxa.com.
  19  *      - Fixed x86_64 cleanness
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/serial.h>
  31 #include <linux/serial_reg.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/gfp.h>
  37 #include <linux/ioport.h>
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/pci.h>
  41 #include <linux/bitops.h>
  42
  43 #include <asm/system.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.4"         /* 1.12 */
  51 #define MXSERMAJOR       174
  52
  53 #define MXSER_BOARDS            4       /* Max. boards */
  54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  56 #define MXSER_ISR_PASS_LIMIT    100
  57
  58 /*CheckIsMoxaMust return value*/
  59 #define MOXA_OTHER_UART         0x00
  60 #define MOXA_MUST_MU150_HWID    0x01
  61 #define MOXA_MUST_MU860_HWID    0x02
  62
  63 #define WAKEUP_CHARS            256
  64
  65 #define UART_MCR_AFE            0x20
  66 #define UART_LSR_SPECIAL        0x1E
  67
  68 #define PCI_DEVICE_ID_POS104UL  0x1044
  69 #define PCI_DEVICE_ID_CB108     0x1080
  70 #define PCI_DEVICE_ID_CP102UF   0x1023
  71 #define PCI_DEVICE_ID_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 struct mxser_mon {
 195         unsigned long rxcnt;
 196         unsigned long txcnt;
 197         unsigned long up_rxcnt;
 198         unsigned long up_txcnt;
 199         int modem_status;
 200         unsigned char hold_reason;
 201 };
 202
 203 struct mxser_mon_ext {
 204         unsigned long rx_cnt[32];
 205         unsigned long tx_cnt[32];
 206         unsigned long up_rxcnt[32];
 207         unsigned long up_txcnt[32];
 208         int modem_status[32];
 209
 210         long baudrate[32];
 211         int databits[32];
 212         int stopbits[32];
 213         int parity[32];
 214         int flowctrl[32];
 215         int fifo[32];
 216         int iftype[32];
 217 };
 218
 219 struct mxser_board;
 220
 221 struct mxser_port {
 222         struct tty_port port;
 223         struct mxser_board *board;
 224
 225         unsigned long ioaddr;
 226         unsigned long opmode_ioaddr;
 227         int max_baud;
 228
 229         int rx_high_water;
 230         int rx_trigger;         /* Rx fifo trigger level */
 231         int rx_low_water;
 232         int baud_base;          /* max. speed */
 233         int type;               /* UART type */
 234
 235         int x_char;             /* xon/xoff character */
 236         int IER;                /* Interrupt Enable Register */
 237         int MCR;                /* Modem control register */
 238
 239         unsigned char stop_rx;
 240         unsigned char ldisc_stop_rx;
 241
 242         int custom_divisor;
 243         unsigned char err_shadow;
 244
 245         struct async_icount icount; /* kernel counters for 4 input interrupts */
 246         int timeout;
 247
 248         int read_status_mask;
 249         int ignore_status_mask;
 250         int xmit_fifo_size;
 251         int xmit_head;
 252         int xmit_tail;
 253         int xmit_cnt;
 254
 255         struct ktermios normal_termios;
 256
 257         struct mxser_mon mon_data;
 258
 259         spinlock_t slock;
 260         wait_queue_head_t delta_msr_wait;
 261 };
 262
 263 struct mxser_board {
 264         unsigned int idx;
 265         int irq;
 266         const struct mxser_cardinfo *info;
 267         unsigned long vector;
 268         unsigned long vector_mask;
 269
 270         int chip_flag;
 271         int uart_type;
 272
 273         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 274 };
 275
 276 struct mxser_mstatus {
 277         tcflag_t cflag;
 278         int cts;
 279         int dsr;
 280         int ri;
 281         int dcd;
 282 };
 283
 284 static struct mxser_board mxser_boards[MXSER_BOARDS];
 285 static struct tty_driver *mxvar_sdriver;
 286 static struct mxser_log mxvar_log;
 287 static int mxser_set_baud_method[MXSER_PORTS + 1];
 288
 289 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 290 {
 291         u8 oldlcr;
 292         u8 efr;
 293
 294         oldlcr = inb(baseio + UART_LCR);
 295         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 296
 297         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 298         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 299
 300         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 301         outb(oldlcr, baseio + UART_LCR);
 302 }
 303
 304 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 305 {
 306         u8 oldlcr;
 307         u8 efr;
 308
 309         oldlcr = inb(baseio + UART_LCR);
 310         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 311
 312         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 313         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 314
 315         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 316         outb(oldlcr, baseio + UART_LCR);
 317 }
 318
 319 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 320 {
 321         u8 oldlcr;
 322         u8 efr;
 323
 324         oldlcr = inb(baseio + UART_LCR);
 325         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 326
 327         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 328         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 329         efr |= MOXA_MUST_EFR_BANK0;
 330
 331         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 332         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 333         outb(oldlcr, baseio + UART_LCR);
 334 }
 335
 336 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 337 {
 338         u8 oldlcr;
 339         u8 efr;
 340
 341         oldlcr = inb(baseio + UART_LCR);
 342         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 343
 344         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 345         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 346         efr |= MOXA_MUST_EFR_BANK0;
 347
 348         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 349         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 350         outb(oldlcr, baseio + UART_LCR);
 351 }
 352
 353 static void mxser_set_must_fifo_value(struct mxser_port *info)
 354 {
 355         u8 oldlcr;
 356         u8 efr;
 357
 358         oldlcr = inb(info->ioaddr + UART_LCR);
 359         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 360
 361         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 362         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 363         efr |= MOXA_MUST_EFR_BANK1;
 364
 365         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 366         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 367         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 368         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 369         outb(oldlcr, info->ioaddr + UART_LCR);
 370 }
 371
 372 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 373 {
 374         u8 oldlcr;
 375         u8 efr;
 376
 377         oldlcr = inb(baseio + UART_LCR);
 378         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 379
 380         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 381         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 382         efr |= MOXA_MUST_EFR_BANK2;
 383
 384         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 385         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 386         outb(oldlcr, baseio + UART_LCR);
 387 }
 388
 389 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 390 {
 391         u8 oldlcr;
 392         u8 efr;
 393
 394         oldlcr = inb(baseio + UART_LCR);
 395         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 396
 397         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 398         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 399         efr |= MOXA_MUST_EFR_BANK2;
 400
 401         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 402         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 403         outb(oldlcr, baseio + UART_LCR);
 404 }
 405
 406 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 407 {
 408         u8 oldlcr;
 409         u8 efr;
 410
 411         oldlcr = inb(baseio + UART_LCR);
 412         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 413
 414         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 415         efr &= ~MOXA_MUST_EFR_SF_MASK;
 416
 417         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 418         outb(oldlcr, baseio + UART_LCR);
 419 }
 420
 421 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 422 {
 423         u8 oldlcr;
 424         u8 efr;
 425
 426         oldlcr = inb(baseio + UART_LCR);
 427         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 428
 429         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 430         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 431         efr |= MOXA_MUST_EFR_SF_TX1;
 432
 433         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 434         outb(oldlcr, baseio + UART_LCR);
 435 }
 436
 437 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 438 {
 439         u8 oldlcr;
 440         u8 efr;
 441
 442         oldlcr = inb(baseio + UART_LCR);
 443         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 444
 445         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 446         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 447
 448         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 449         outb(oldlcr, baseio + UART_LCR);
 450 }
 451
 452 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 453 {
 454         u8 oldlcr;
 455         u8 efr;
 456
 457         oldlcr = inb(baseio + UART_LCR);
 458         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 459
 460         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 461         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 462         efr |= MOXA_MUST_EFR_SF_RX1;
 463
 464         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 465         outb(oldlcr, baseio + UART_LCR);
 466 }
 467
 468 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 469 {
 470         u8 oldlcr;
 471         u8 efr;
 472
 473         oldlcr = inb(baseio + UART_LCR);
 474         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 475
 476         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 477         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 478
 479         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 480         outb(oldlcr, baseio + UART_LCR);
 481 }
 482
 483 #ifdef CONFIG_PCI
 484 static int __devinit CheckIsMoxaMust(unsigned long io)
 485 {
 486         u8 oldmcr, hwid;
 487         int i;
 488
 489         outb(0, io + UART_LCR);
 490         mxser_disable_must_enchance_mode(io);
 491         oldmcr = inb(io + UART_MCR);
 492         outb(0, io + UART_MCR);
 493         mxser_set_must_xon1_value(io, 0x11);
 494         if ((hwid = inb(io + UART_MCR)) != 0) {
 495                 outb(oldmcr, io + UART_MCR);
 496                 return MOXA_OTHER_UART;
 497         }
 498
 499         mxser_get_must_hardware_id(io, &hwid);
 500         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 501                 if (hwid == Gpci_uart_info[i].type)
 502                         return (int)hwid;
 503         }
 504         return MOXA_OTHER_UART;
 505 }
 506 #endif
 507
 508 static void process_txrx_fifo(struct mxser_port *info)
 509 {
 510         int i;
 511
 512         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 513                 info->rx_trigger = 1;
 514                 info->rx_high_water = 1;
 515                 info->rx_low_water = 1;
 516                 info->xmit_fifo_size = 1;
 517         } else
 518                 for (i = 0; i < UART_INFO_NUM; i++)
 519                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 520                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 521                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 522                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 523                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 524                                 break;
 525                         }
 526 }
 527
 528 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 529 {
 530         static unsigned char mxser_msr[MXSER_PORTS + 1];
 531         unsigned char status = 0;
 532
 533         status = inb(baseaddr + UART_MSR);
 534
 535         mxser_msr[port] &= 0x0F;
 536         mxser_msr[port] |= status;
 537         status = mxser_msr[port];
 538         if (mode)
 539                 mxser_msr[port] = 0;
 540
 541         return status;
 542 }
 543
 544 static int mxser_carrier_raised(struct tty_port *port)
 545 {
 546         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 547         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
 548 }
 549
 550 static void mxser_raise_dtr_rts(struct tty_port *port)
 551 {
 552         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 553         unsigned long flags;
 554
 555         spin_lock_irqsave(&mp->slock, flags);
 556         outb(inb(mp->ioaddr + UART_MCR) |
 557                 UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
 558         spin_unlock_irqrestore(&mp->slock, flags);
 559 }
 560
 561 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
 562                 struct mxser_port *mp)
 563 {
 564         DECLARE_WAITQUEUE(wait, current);
 565         int retval;
 566         int do_clocal = 0;
 567         unsigned long flags;
 568         int cd;
 569         struct tty_port *port = &mp->port;
 570
 571         /*
 572          * If non-blocking mode is set, or the port is not enabled,
 573          * then make the check up front and then exit.
 574          */
 575         if ((filp->f_flags & O_NONBLOCK) ||
 576                         test_bit(TTY_IO_ERROR, &tty->flags)) {
 577                 port->flags |= ASYNC_NORMAL_ACTIVE;
 578                 return 0;
 579         }
 580
 581         if (tty->termios->c_cflag & CLOCAL)
 582                 do_clocal = 1;
 583
 584         /*
 585          * Block waiting for the carrier detect and the line to become
 586          * free (i.e., not in use by the callout).  While we are in
 587          * this loop, port->count is dropped by one, so that
 588          * mxser_close() knows when to free things.  We restore it upon
 589          * exit, either normal or abnormal.
 590          */
 591         retval = 0;
 592         add_wait_queue(&port->open_wait, &wait);
 593
 594         spin_lock_irqsave(&mp->slock, flags);
 595         if (!tty_hung_up_p(filp))
 596                 port->count--;
 597         spin_unlock_irqrestore(&mp->slock, flags);
 598         port->blocked_open++;
 599         while (1) {
 600                 tty_port_raise_dtr_rts(port);
 601                 set_current_state(TASK_INTERRUPTIBLE);
 602                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
 603                         if (port->flags & ASYNC_HUP_NOTIFY)
 604                                 retval = -EAGAIN;
 605                         else
 606                                 retval = -ERESTARTSYS;
 607                         break;
 608                 }
 609                 cd = tty_port_carrier_raised(port);
 610                 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
 611                         break;
 612                 if (signal_pending(current)) {
 613                         retval = -ERESTARTSYS;
 614                         break;
 615                 }
 616                 schedule();
 617         }
 618         set_current_state(TASK_RUNNING);
 619         remove_wait_queue(&port->open_wait, &wait);
 620         if (!tty_hung_up_p(filp))
 621                 port->count++;
 622         port->blocked_open--;
 623         if (retval)
 624                 return retval;
 625         port->flags |= ASYNC_NORMAL_ACTIVE;
 626         return 0;
 627 }
 628
 629 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 630 {
 631         struct mxser_port *info = tty->driver_data;
 632         int quot = 0, baud;
 633         unsigned char cval;
 634
 635         if (!info->ioaddr)
 636                 return -1;
 637
 638         if (newspd > info->max_baud)
 639                 return -1;
 640
 641         if (newspd == 134) {
 642                 quot = 2 * info->baud_base / 269;
 643                 tty_encode_baud_rate(tty, 134, 134);
 644         } else if (newspd) {
 645                 quot = info->baud_base / newspd;
 646                 if (quot == 0)
 647                         quot = 1;
 648                 baud = info->baud_base/quot;
 649                 tty_encode_baud_rate(tty, baud, baud);
 650         } else {
 651                 quot = 0;
 652         }
 653
 654         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 655         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 656
 657         if (quot) {
 658                 info->MCR |= UART_MCR_DTR;
 659                 outb(info->MCR, info->ioaddr + UART_MCR);
 660         } else {
 661                 info->MCR &= ~UART_MCR_DTR;
 662                 outb(info->MCR, info->ioaddr + UART_MCR);
 663                 return 0;
 664         }
 665
 666         cval = inb(info->ioaddr + UART_LCR);
 667
 668         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 669
 670         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 671         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 672         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 673
 674 #ifdef BOTHER
 675         if (C_BAUD(tty) == BOTHER) {
 676                 quot = info->baud_base % newspd;
 677                 quot *= 8;
 678                 if (quot % newspd > newspd / 2) {
 679                         quot /= newspd;
 680                         quot++;
 681                 } else
 682                         quot /= newspd;
 683
 684                 mxser_set_must_enum_value(info->ioaddr, quot);
 685         } else
 686 #endif
 687                 mxser_set_must_enum_value(info->ioaddr, 0);
 688
 689         return 0;
 690 }
 691
 692 /*
 693  * This routine is called to set the UART divisor registers to match
 694  * the specified baud rate for a serial port.
 695  */
 696 static int mxser_change_speed(struct tty_struct *tty,
 697                                         struct ktermios *old_termios)
 698 {
 699         struct mxser_port *info = tty->driver_data;
 700         unsigned cflag, cval, fcr;
 701         int ret = 0;
 702         unsigned char status;
 703
 704         cflag = tty->termios->c_cflag;
 705         if (!info->ioaddr)
 706                 return ret;
 707
 708         if (mxser_set_baud_method[tty->index] == 0)
 709                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 710
 711         /* byte size and parity */
 712         switch (cflag & CSIZE) {
 713         case CS5:
 714                 cval = 0x00;
 715                 break;
 716         case CS6:
 717                 cval = 0x01;
 718                 break;
 719         case CS7:
 720                 cval = 0x02;
 721                 break;
 722         case CS8:
 723                 cval = 0x03;
 724                 break;
 725         default:
 726                 cval = 0x00;
 727                 break;          /* too keep GCC shut... */
 728         }
 729         if (cflag & CSTOPB)
 730                 cval |= 0x04;
 731         if (cflag & PARENB)
 732                 cval |= UART_LCR_PARITY;
 733         if (!(cflag & PARODD))
 734                 cval |= UART_LCR_EPAR;
 735         if (cflag & CMSPAR)
 736                 cval |= UART_LCR_SPAR;
 737
 738         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 739                 if (info->board->chip_flag) {
 740                         fcr = UART_FCR_ENABLE_FIFO;
 741                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 742                         mxser_set_must_fifo_value(info);
 743                 } else
 744                         fcr = 0;
 745         } else {
 746                 fcr = UART_FCR_ENABLE_FIFO;
 747                 if (info->board->chip_flag) {
 748                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 749                         mxser_set_must_fifo_value(info);
 750                 } else {
 751                         switch (info->rx_trigger) {
 752                         case 1:
 753                                 fcr |= UART_FCR_TRIGGER_1;
 754                                 break;
 755                         case 4:
 756                                 fcr |= UART_FCR_TRIGGER_4;
 757                                 break;
 758                         case 8:
 759                                 fcr |= UART_FCR_TRIGGER_8;
 760                                 break;
 761                         default:
 762                                 fcr |= UART_FCR_TRIGGER_14;
 763                                 break;
 764                         }
 765                 }
 766         }
 767
 768         /* CTS flow control flag and modem status interrupts */
 769         info->IER &= ~UART_IER_MSI;
 770         info->MCR &= ~UART_MCR_AFE;
 771         if (cflag & CRTSCTS) {
 772                 info->port.flags |= ASYNC_CTS_FLOW;
 773                 info->IER |= UART_IER_MSI;
 774                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 775                         info->MCR |= UART_MCR_AFE;
 776                 } else {
 777                         status = inb(info->ioaddr + UART_MSR);
 778                         if (tty->hw_stopped) {
 779                                 if (status & UART_MSR_CTS) {
 780                                         tty->hw_stopped = 0;
 781                                         if (info->type != PORT_16550A &&
 782                                                         !info->board->chip_flag) {
 783                                                 outb(info->IER & ~UART_IER_THRI,
 784                                                         info->ioaddr +
 785                                                         UART_IER);
 786                                                 info->IER |= UART_IER_THRI;
 787                                                 outb(info->IER, info->ioaddr +
 788                                                                 UART_IER);
 789                                         }
 790                                         tty_wakeup(tty);
 791                                 }
 792                         } else {
 793                                 if (!(status & UART_MSR_CTS)) {
 794                                         tty->hw_stopped = 1;
 795                                         if ((info->type != PORT_16550A) &&
 796                                                         (!info->board->chip_flag)) {
 797                                                 info->IER &= ~UART_IER_THRI;
 798                                                 outb(info->IER, info->ioaddr +
 799                                                                 UART_IER);
 800                                         }
 801                                 }
 802                         }
 803                 }
 804         } else {
 805                 info->port.flags &= ~ASYNC_CTS_FLOW;
 806         }
 807         outb(info->MCR, info->ioaddr + UART_MCR);
 808         if (cflag & CLOCAL) {
 809                 info->port.flags &= ~ASYNC_CHECK_CD;
 810         } else {
 811                 info->port.flags |= ASYNC_CHECK_CD;
 812                 info->IER |= UART_IER_MSI;
 813         }
 814         outb(info->IER, info->ioaddr + UART_IER);
 815
 816         /*
 817          * Set up parity check flag
 818          */
 819         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 820         if (I_INPCK(tty))
 821                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 822         if (I_BRKINT(tty) || I_PARMRK(tty))
 823                 info->read_status_mask |= UART_LSR_BI;
 824
 825         info->ignore_status_mask = 0;
 826
 827         if (I_IGNBRK(tty)) {
 828                 info->ignore_status_mask |= UART_LSR_BI;
 829                 info->read_status_mask |= UART_LSR_BI;
 830                 /*
 831                  * If we're ignore parity and break indicators, ignore
 832                  * overruns too.  (For real raw support).
 833                  */
 834                 if (I_IGNPAR(tty)) {
 835                         info->ignore_status_mask |=
 836                                                 UART_LSR_OE |
 837                                                 UART_LSR_PE |
 838                                                 UART_LSR_FE;
 839                         info->read_status_mask |=
 840                                                 UART_LSR_OE |
 841                                                 UART_LSR_PE |
 842                                                 UART_LSR_FE;
 843                 }
 844         }
 845         if (info->board->chip_flag) {
 846                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 847                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 848                 if (I_IXON(tty)) {
 849                         mxser_enable_must_rx_software_flow_control(
 850                                         info->ioaddr);
 851                 } else {
 852                         mxser_disable_must_rx_software_flow_control(
 853                                         info->ioaddr);
 854                 }
 855                 if (I_IXOFF(tty)) {
 856                         mxser_enable_must_tx_software_flow_control(
 857                                         info->ioaddr);
 858                 } else {
 859                         mxser_disable_must_tx_software_flow_control(
 860                                         info->ioaddr);
 861                 }
 862         }
 863
 864
 865         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 866         outb(cval, info->ioaddr + UART_LCR);
 867
 868         return ret;
 869 }
 870
 871 static void mxser_check_modem_status(struct tty_struct *tty,
 872                                 struct mxser_port *port, int status)
 873 {
 874         /* update input line counters */
 875         if (status & UART_MSR_TERI)
 876                 port->icount.rng++;
 877         if (status & UART_MSR_DDSR)
 878                 port->icount.dsr++;
 879         if (status & UART_MSR_DDCD)
 880                 port->icount.dcd++;
 881         if (status & UART_MSR_DCTS)
 882                 port->icount.cts++;
 883         port->mon_data.modem_status = status;
 884         wake_up_interruptible(&port->delta_msr_wait);
 885
 886         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 887                 if (status & UART_MSR_DCD)
 888                         wake_up_interruptible(&port->port.open_wait);
 889         }
 890
 891         tty = tty_port_tty_get(&port->port);
 892         if (port->port.flags & ASYNC_CTS_FLOW) {
 893                 if (tty->hw_stopped) {
 894                         if (status & UART_MSR_CTS) {
 895                                 tty->hw_stopped = 0;
 896
 897                                 if ((port->type != PORT_16550A) &&
 898                                                 (!port->board->chip_flag)) {
 899                                         outb(port->IER & ~UART_IER_THRI,
 900                                                 port->ioaddr + UART_IER);
 901                                         port->IER |= UART_IER_THRI;
 902                                         outb(port->IER, port->ioaddr +
 903                                                         UART_IER);
 904                                 }
 905                                 tty_wakeup(tty);
 906                         }
 907                 } else {
 908                         if (!(status & UART_MSR_CTS)) {
 909                                 tty->hw_stopped = 1;
 910                                 if (port->type != PORT_16550A &&
 911                                                 !port->board->chip_flag) {
 912                                         port->IER &= ~UART_IER_THRI;
 913                                         outb(port->IER, port->ioaddr +
 914                                                         UART_IER);
 915                                 }
 916                         }
 917                 }
 918         }
 919 }
 920
 921 static int mxser_startup(struct tty_struct *tty)
 922 {
 923         struct mxser_port *info = tty->driver_data;
 924         unsigned long page;
 925         unsigned long flags;
 926
 927         page = __get_free_page(GFP_KERNEL);
 928         if (!page)
 929                 return -ENOMEM;
 930
 931         spin_lock_irqsave(&info->slock, flags);
 932
 933         if (info->port.flags & ASYNC_INITIALIZED) {
 934                 free_page(page);
 935                 spin_unlock_irqrestore(&info->slock, flags);
 936                 return 0;
 937         }
 938
 939         if (!info->ioaddr || !info->type) {
 940                 set_bit(TTY_IO_ERROR, &tty->flags);
 941                 free_page(page);
 942                 spin_unlock_irqrestore(&info->slock, flags);
 943                 return 0;
 944         }
 945         if (info->port.xmit_buf)
 946                 free_page(page);
 947         else
 948                 info->port.xmit_buf = (unsigned char *) page;
 949
 950         /*
 951          * Clear the FIFO buffers and disable them
 952          * (they will be reenabled in mxser_change_speed())
 953          */
 954         if (info->board->chip_flag)
 955                 outb((UART_FCR_CLEAR_RCVR |
 956                         UART_FCR_CLEAR_XMIT |
 957                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 958         else
 959                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 960                         info->ioaddr + UART_FCR);
 961
 962         /*
 963          * At this point there's no way the LSR could still be 0xFF;
 964          * if it is, then bail out, because there's likely no UART
 965          * here.
 966          */
 967         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 968                 spin_unlock_irqrestore(&info->slock, flags);
 969                 if (capable(CAP_SYS_ADMIN)) {
 970                         if (tty)
 971                                 set_bit(TTY_IO_ERROR, &tty->flags);
 972                         return 0;
 973                 } else
 974                         return -ENODEV;
 975         }
 976
 977         /*
 978          * Clear the interrupt registers.
 979          */
 980         (void) inb(info->ioaddr + UART_LSR);
 981         (void) inb(info->ioaddr + UART_RX);
 982         (void) inb(info->ioaddr + UART_IIR);
 983         (void) inb(info->ioaddr + UART_MSR);
 984
 985         /*
 986          * Now, initialize the UART
 987          */
 988         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 989         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 990         outb(info->MCR, info->ioaddr + UART_MCR);
 991
 992         /*
 993          * Finally, enable interrupts
 994          */
 995         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 996
 997         if (info->board->chip_flag)
 998                 info->IER |= MOXA_MUST_IER_EGDAI;
 999         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
1000
1001         /*
1002          * And clear the interrupt registers again for luck.
1003          */
1004         (void) inb(info->ioaddr + UART_LSR);
1005         (void) inb(info->ioaddr + UART_RX);
1006         (void) inb(info->ioaddr + UART_IIR);
1007         (void) inb(info->ioaddr + UART_MSR);
1008
1009         clear_bit(TTY_IO_ERROR, &tty->flags);
1010         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1011
1012         /*
1013          * and set the speed of the serial port
1014          */
1015         mxser_change_speed(tty, NULL);
1016         info->port.flags |= ASYNC_INITIALIZED;
1017         spin_unlock_irqrestore(&info->slock, flags);
1018
1019         return 0;
1020 }
1021
1022 /*
1023  * This routine will shutdown a serial port; interrupts maybe disabled, and
1024  * DTR is dropped if the hangup on close termio flag is on.
1025  */
1026 static void mxser_shutdown(struct tty_struct *tty)
1027 {
1028         struct mxser_port *info = tty->driver_data;
1029         unsigned long flags;
1030
1031         if (!(info->port.flags & ASYNC_INITIALIZED))
1032                 return;
1033
1034         spin_lock_irqsave(&info->slock, flags);
1035
1036         /*
1037          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1038          * here so the queue might never be waken up
1039          */
1040         wake_up_interruptible(&info->delta_msr_wait);
1041
1042         /*
1043          * Free the IRQ, if necessary
1044          */
1045         if (info->port.xmit_buf) {
1046                 free_page((unsigned long) info->port.xmit_buf);
1047                 info->port.xmit_buf = NULL;
1048         }
1049
1050         info->IER = 0;
1051         outb(0x00, info->ioaddr + UART_IER);
1052
1053         if (tty->termios->c_cflag & HUPCL)
1054                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1055         outb(info->MCR, info->ioaddr + UART_MCR);
1056
1057         /* clear Rx/Tx FIFO's */
1058         if (info->board->chip_flag)
1059                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
1060                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1061                                 info->ioaddr + UART_FCR);
1062         else
1063                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1064                         info->ioaddr + UART_FCR);
1065
1066         /* read data port to reset things */
1067         (void) inb(info->ioaddr + UART_RX);
1068
1069         set_bit(TTY_IO_ERROR, &tty->flags);
1070
1071         info->port.flags &= ~ASYNC_INITIALIZED;
1072
1073         if (info->board->chip_flag)
1074                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
1075
1076         spin_unlock_irqrestore(&info->slock, flags);
1077 }
1078
1079 /*
1080  * This routine is called whenever a serial port is opened.  It
1081  * enables interrupts for a serial port, linking in its async structure into
1082  * the IRQ chain.   It also performs the serial-specific
1083  * initialization for the tty structure.
1084  */
1085 static int mxser_open(struct tty_struct *tty, struct file *filp)
1086 {
1087         struct mxser_port *info;
1088         unsigned long flags;
1089         int retval, line;
1090
1091         line = tty->index;
1092         if (line == MXSER_PORTS)
1093                 return 0;
1094         if (line < 0 || line > MXSER_PORTS)
1095                 return -ENODEV;
1096         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1097         if (!info->ioaddr)
1098                 return -ENODEV;
1099
1100         tty->driver_data = info;
1101         tty_port_tty_set(&info->port, tty);
1102         /*
1103          * Start up serial port
1104          */
1105         spin_lock_irqsave(&info->slock, flags);
1106         info->port.count++;
1107         spin_unlock_irqrestore(&info->slock, flags);
1108         retval = mxser_startup(tty);
1109         if (retval)
1110                 return retval;
1111
1112         retval = mxser_block_til_ready(tty, filp, info);
1113         if (retval)
1114                 return retval;
1115
1116         /* unmark here for very high baud rate (ex. 921600 bps) used */
1117         tty->low_latency = 1;
1118         return 0;
1119 }
1120
1121 static void mxser_flush_buffer(struct tty_struct *tty)
1122 {
1123         struct mxser_port *info = tty->driver_data;
1124         char fcr;
1125         unsigned long flags;
1126
1127
1128         spin_lock_irqsave(&info->slock, flags);
1129         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1130
1131         fcr = inb(info->ioaddr + UART_FCR);
1132         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1133                 info->ioaddr + UART_FCR);
1134         outb(fcr, info->ioaddr + UART_FCR);
1135
1136         spin_unlock_irqrestore(&info->slock, flags);
1137
1138         tty_wakeup(tty);
1139 }
1140
1141
1142 /*
1143  * This routine is called when the serial port gets closed.  First, we
1144  * wait for the last remaining data to be sent.  Then, we unlink its
1145  * async structure from the interrupt chain if necessary, and we free
1146  * that IRQ if nothing is left in the chain.
1147  */
1148 static void mxser_close(struct tty_struct *tty, struct file *filp)
1149 {
1150         struct mxser_port *info = tty->driver_data;
1151
1152         unsigned long timeout;
1153         unsigned long flags;
1154
1155         if (tty->index == MXSER_PORTS)
1156                 return;
1157         if (!info)
1158                 return;
1159
1160         spin_lock_irqsave(&info->slock, flags);
1161
1162         if (tty_hung_up_p(filp)) {
1163                 spin_unlock_irqrestore(&info->slock, flags);
1164                 return;
1165         }
1166         if ((tty->count == 1) && (info->port.count != 1)) {
1167                 /*
1168                  * Uh, oh.  tty->count is 1, which means that the tty
1169                  * structure will be freed.  Info->port.count should always
1170                  * be one in these conditions.  If it's greater than
1171                  * one, we've got real problems, since it means the
1172                  * serial port won't be shutdown.
1173                  */
1174                 printk(KERN_ERR "mxser_close: bad serial port count; "
1175                         "tty->count is 1, info->port.count is %d\n", info->port.count);
1176                 info->port.count = 1;
1177         }
1178         if (--info->port.count < 0) {
1179                 printk(KERN_ERR "mxser_close: bad serial port count for "
1180                         "ttys%d: %d\n", tty->index, info->port.count);
1181                 info->port.count = 0;
1182         }
1183         if (info->port.count) {
1184                 spin_unlock_irqrestore(&info->slock, flags);
1185                 return;
1186         }
1187         info->port.flags |= ASYNC_CLOSING;
1188         spin_unlock_irqrestore(&info->slock, flags);
1189         /*
1190          * Save the termios structure, since this port may have
1191          * separate termios for callout and dialin.
1192          */
1193         if (info->port.flags & ASYNC_NORMAL_ACTIVE)
1194                 info->normal_termios = *tty->termios;
1195         /*
1196          * Now we wait for the transmit buffer to clear; and we notify
1197          * the line discipline to only process XON/XOFF characters.
1198          */
1199         tty->closing = 1;
1200         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1201                 tty_wait_until_sent(tty, info->port.closing_wait);
1202         /*
1203          * At this point we stop accepting input.  To do this, we
1204          * disable the receive line status interrupts, and tell the
1205          * interrupt driver to stop checking the data ready bit in the
1206          * line status register.
1207          */
1208         info->IER &= ~UART_IER_RLSI;
1209         if (info->board->chip_flag)
1210                 info->IER &= ~MOXA_MUST_RECV_ISR;
1211
1212         if (info->port.flags & ASYNC_INITIALIZED) {
1213                 outb(info->IER, info->ioaddr + UART_IER);
1214                 /*
1215                  * Before we drop DTR, make sure the UART transmitter
1216                  * has completely drained; this is especially
1217                  * important if there is a transmit FIFO!
1218                  */
1219                 timeout = jiffies + HZ;
1220                 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1221                         schedule_timeout_interruptible(5);
1222                         if (time_after(jiffies, timeout))
1223                                 break;
1224                 }
1225         }
1226         mxser_shutdown(tty);
1227
1228         mxser_flush_buffer(tty);
1229         tty_ldisc_flush(tty);
1230
1231         tty->closing = 0;
1232         tty_port_tty_set(&info->port, NULL);
1233         if (info->port.blocked_open) {
1234                 if (info->port.close_delay)
1235                         schedule_timeout_interruptible(info->port.close_delay);
1236                 wake_up_interruptible(&info->port.open_wait);
1237         }
1238
1239         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1240 }
1241
1242 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1243 {
1244         int c, total = 0;
1245         struct mxser_port *info = tty->driver_data;
1246         unsigned long flags;
1247
1248         if (!info->port.xmit_buf)
1249                 return 0;
1250
1251         while (1) {
1252                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1253                                           SERIAL_XMIT_SIZE - info->xmit_head));
1254                 if (c <= 0)
1255                         break;
1256
1257                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1258                 spin_lock_irqsave(&info->slock, flags);
1259                 info->xmit_head = (info->xmit_head + c) &
1260                                   (SERIAL_XMIT_SIZE - 1);
1261                 info->xmit_cnt += c;
1262                 spin_unlock_irqrestore(&info->slock, flags);
1263
1264                 buf += c;
1265                 count -= c;
1266                 total += c;
1267         }
1268
1269         if (info->xmit_cnt && !tty->stopped) {
1270                 if (!tty->hw_stopped ||
1271                                 (info->type == PORT_16550A) ||
1272                                 (info->board->chip_flag)) {
1273                         spin_lock_irqsave(&info->slock, flags);
1274                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1275                                         UART_IER);
1276                         info->IER |= UART_IER_THRI;
1277                         outb(info->IER, info->ioaddr + UART_IER);
1278                         spin_unlock_irqrestore(&info->slock, flags);
1279                 }
1280         }
1281         return total;
1282 }
1283
1284 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1285 {
1286         struct mxser_port *info = tty->driver_data;
1287         unsigned long flags;
1288
1289         if (!info->port.xmit_buf)
1290                 return 0;
1291
1292         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1293                 return 0;
1294
1295         spin_lock_irqsave(&info->slock, flags);
1296         info->port.xmit_buf[info->xmit_head++] = ch;
1297         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1298         info->xmit_cnt++;
1299         spin_unlock_irqrestore(&info->slock, flags);
1300         if (!tty->stopped) {
1301                 if (!tty->hw_stopped ||
1302                                 (info->type == PORT_16550A) ||
1303                                 info->board->chip_flag) {
1304                         spin_lock_irqsave(&info->slock, flags);
1305                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1306                         info->IER |= UART_IER_THRI;
1307                         outb(info->IER, info->ioaddr + UART_IER);
1308                         spin_unlock_irqrestore(&info->slock, flags);
1309                 }
1310         }
1311         return 1;
1312 }
1313
1314
1315 static void mxser_flush_chars(struct tty_struct *tty)
1316 {
1317         struct mxser_port *info = tty->driver_data;
1318         unsigned long flags;
1319
1320         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1321                         (tty->hw_stopped && info->type != PORT_16550A &&
1322                          !info->board->chip_flag))
1323                 return;
1324
1325         spin_lock_irqsave(&info->slock, flags);
1326
1327         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1328         info->IER |= UART_IER_THRI;
1329         outb(info->IER, info->ioaddr + UART_IER);
1330
1331         spin_unlock_irqrestore(&info->slock, flags);
1332 }
1333
1334 static int mxser_write_room(struct tty_struct *tty)
1335 {
1336         struct mxser_port *info = tty->driver_data;
1337         int ret;
1338
1339         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1340         return ret < 0 ? 0 : ret;
1341 }
1342
1343 static int mxser_chars_in_buffer(struct tty_struct *tty)
1344 {
1345         struct mxser_port *info = tty->driver_data;
1346         return info->xmit_cnt;
1347 }
1348
1349 /*
1350  * ------------------------------------------------------------
1351  * friends of mxser_ioctl()
1352  * ------------------------------------------------------------
1353  */
1354 static int mxser_get_serial_info(struct tty_struct *tty,
1355                 struct serial_struct __user *retinfo)
1356 {
1357         struct mxser_port *info = tty->driver_data;
1358         struct serial_struct tmp = {
1359                 .type = info->type,
1360                 .line = tty->index,
1361                 .port = info->ioaddr,
1362                 .irq = info->board->irq,
1363                 .flags = info->port.flags,
1364                 .baud_base = info->baud_base,
1365                 .close_delay = info->port.close_delay,
1366                 .closing_wait = info->port.closing_wait,
1367                 .custom_divisor = info->custom_divisor,
1368                 .hub6 = 0
1369         };
1370         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1371                 return -EFAULT;
1372         return 0;
1373 }
1374
1375 static int mxser_set_serial_info(struct tty_struct *tty,
1376                 struct serial_struct __user *new_info)
1377 {
1378         struct mxser_port *info = tty->driver_data;
1379         struct serial_struct new_serial;
1380         speed_t baud;
1381         unsigned long sl_flags;
1382         unsigned int flags;
1383         int retval = 0;
1384
1385         if (!new_info || !info->ioaddr)
1386                 return -ENODEV;
1387         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1388                 return -EFAULT;
1389
1390         if (new_serial.irq != info->board->irq ||
1391                         new_serial.port != info->ioaddr)
1392                 return -EINVAL;
1393
1394         flags = info->port.flags & ASYNC_SPD_MASK;
1395
1396         if (!capable(CAP_SYS_ADMIN)) {
1397                 if ((new_serial.baud_base != info->baud_base) ||
1398                                 (new_serial.close_delay != info->port.close_delay) ||
1399                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1400                         return -EPERM;
1401                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1402                                 (new_serial.flags & ASYNC_USR_MASK));
1403         } else {
1404                 /*
1405                  * OK, past this point, all the error checking has been done.
1406                  * At this point, we start making changes.....
1407                  */
1408                 info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
1409                                 (new_serial.flags & ASYNC_FLAGS));
1410                 info->port.close_delay = new_serial.close_delay * HZ / 100;
1411                 info->port.closing_wait = new_serial.closing_wait * HZ / 100;
1412                 tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY)
1413                                                                 ? 1 : 0;
1414                 if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1415                                 (new_serial.baud_base != info->baud_base ||
1416                                 new_serial.custom_divisor !=
1417                                 info->custom_divisor)) {
1418                         baud = new_serial.baud_base / new_serial.custom_divisor;
1419                         tty_encode_baud_rate(tty, baud, baud);
1420                 }
1421         }
1422
1423         info->type = new_serial.type;
1424
1425         process_txrx_fifo(info);
1426
1427         if (info->port.flags & ASYNC_INITIALIZED) {
1428                 if (flags != (info->port.flags & ASYNC_SPD_MASK)) {
1429                         spin_lock_irqsave(&info->slock, sl_flags);
1430                         mxser_change_speed(tty, NULL);
1431                         spin_unlock_irqrestore(&info->slock, sl_flags);
1432                 }
1433         } else
1434                 retval = mxser_startup(tty);
1435
1436         return retval;
1437 }
1438
1439 /*
1440  * mxser_get_lsr_info - get line status register info
1441  *
1442  * Purpose: Let user call ioctl() to get info when the UART physically
1443  *          is emptied.  On bus types like RS485, the transmitter must
1444  *          release the bus after transmitting. This must be done when
1445  *          the transmit shift register is empty, not be done when the
1446  *          transmit holding register is empty.  This functionality
1447  *          allows an RS485 driver to be written in user space.
1448  */
1449 static int mxser_get_lsr_info(struct mxser_port *info,
1450                 unsigned int __user *value)
1451 {
1452         unsigned char status;
1453         unsigned int result;
1454         unsigned long flags;
1455
1456         spin_lock_irqsave(&info->slock, flags);
1457         status = inb(info->ioaddr + UART_LSR);
1458         spin_unlock_irqrestore(&info->slock, flags);
1459         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1460         return put_user(result, value);
1461 }
1462
1463 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1464 {
1465         struct mxser_port *info = tty->driver_data;
1466         unsigned char control, status;
1467         unsigned long flags;
1468
1469
1470         if (tty->index == MXSER_PORTS)
1471                 return -ENOIOCTLCMD;
1472         if (test_bit(TTY_IO_ERROR, &tty->flags))
1473                 return -EIO;
1474
1475         control = info->MCR;
1476
1477         spin_lock_irqsave(&info->slock, flags);
1478         status = inb(info->ioaddr + UART_MSR);
1479         if (status & UART_MSR_ANY_DELTA)
1480                 mxser_check_modem_status(tty, info, status);
1481         spin_unlock_irqrestore(&info->slock, flags);
1482         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1483                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1484                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1485                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1486                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1487                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1488 }
1489
1490 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1491                 unsigned int set, unsigned int clear)
1492 {
1493         struct mxser_port *info = tty->driver_data;
1494         unsigned long flags;
1495
1496
1497         if (tty->index == MXSER_PORTS)
1498                 return -ENOIOCTLCMD;
1499         if (test_bit(TTY_IO_ERROR, &tty->flags))
1500                 return -EIO;
1501
1502         spin_lock_irqsave(&info->slock, flags);
1503
1504         if (set & TIOCM_RTS)
1505                 info->MCR |= UART_MCR_RTS;
1506         if (set & TIOCM_DTR)
1507                 info->MCR |= UART_MCR_DTR;
1508
1509         if (clear & TIOCM_RTS)
1510                 info->MCR &= ~UART_MCR_RTS;
1511         if (clear & TIOCM_DTR)
1512                 info->MCR &= ~UART_MCR_DTR;
1513
1514         outb(info->MCR, info->ioaddr + UART_MCR);
1515         spin_unlock_irqrestore(&info->slock, flags);
1516         return 0;
1517 }
1518
1519 static int __init mxser_program_mode(int port)
1520 {
1521         int id, i, j, n;
1522
1523         outb(0, port);
1524         outb(0, port);
1525         outb(0, port);
1526         (void)inb(port);
1527         (void)inb(port);
1528         outb(0, port);
1529         (void)inb(port);
1530
1531         id = inb(port + 1) & 0x1F;
1532         if ((id != C168_ASIC_ID) &&
1533                         (id != C104_ASIC_ID) &&
1534                         (id != C102_ASIC_ID) &&
1535                         (id != CI132_ASIC_ID) &&
1536                         (id != CI134_ASIC_ID) &&
1537                         (id != CI104J_ASIC_ID))
1538                 return -1;
1539         for (i = 0, j = 0; i < 4; i++) {
1540                 n = inb(port + 2);
1541                 if (n == 'M') {
1542                         j = 1;
1543                 } else if ((j == 1) && (n == 1)) {
1544                         j = 2;
1545                         break;
1546                 } else
1547                         j = 0;
1548         }
1549         if (j != 2)
1550                 id = -2;
1551         return id;
1552 }
1553
1554 static void __init mxser_normal_mode(int port)
1555 {
1556         int i, n;
1557
1558         outb(0xA5, port + 1);
1559         outb(0x80, port + 3);
1560         outb(12, port + 0);     /* 9600 bps */
1561         outb(0, port + 1);
1562         outb(0x03, port + 3);   /* 8 data bits */
1563         outb(0x13, port + 4);   /* loop back mode */
1564         for (i = 0; i < 16; i++) {
1565                 n = inb(port + 5);
1566                 if ((n & 0x61) == 0x60)
1567                         break;
1568                 if ((n & 1) == 1)
1569                         (void)inb(port);
1570         }
1571         outb(0x00, port + 4);
1572 }
1573
1574 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1575 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1576 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1577 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1578 #define EN_CCMD         0x000   /* Chip's command register     */
1579 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1580 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1581 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1582 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1583 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1584 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1585 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1586 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1587 static int __init mxser_read_register(int port, unsigned short *regs)
1588 {
1589         int i, k, value, id;
1590         unsigned int j;
1591
1592         id = mxser_program_mode(port);
1593         if (id < 0)
1594                 return id;
1595         for (i = 0; i < 14; i++) {
1596                 k = (i & 0x3F) | 0x180;
1597                 for (j = 0x100; j > 0; j >>= 1) {
1598                         outb(CHIP_CS, port);
1599                         if (k & j) {
1600                                 outb(CHIP_CS | CHIP_DO, port);
1601                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1602                         } else {
1603                                 outb(CHIP_CS, port);
1604                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1605                         }
1606                 }
1607                 (void)inb(port);
1608                 value = 0;
1609                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1610                         outb(CHIP_CS, port);
1611                         outb(CHIP_CS | CHIP_SK, port);
1612                         if (inb(port) & CHIP_DI)
1613                                 value |= j;
1614                 }
1615                 regs[i] = value;
1616                 outb(0, port);
1617         }
1618         mxser_normal_mode(port);
1619         return id;
1620 }
1621
1622 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1623 {
1624         struct mxser_port *port;
1625         struct tty_struct *tty;
1626         int result, status;
1627         unsigned int i, j;
1628         int ret = 0;
1629
1630         switch (cmd) {
1631         case MOXA_GET_MAJOR:
1632                 if (printk_ratelimit())
1633                         printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1634                                         "%x (GET_MAJOR), fix your userspace\n",
1635                                         current->comm, cmd);
1636                 return put_user(ttymajor, (int __user *)argp);
1637
1638         case MOXA_CHKPORTENABLE:
1639                 result = 0;
1640                 lock_kernel();
1641                 for (i = 0; i < MXSER_BOARDS; i++)
1642                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1643                                 if (mxser_boards[i].ports[j].ioaddr)
1644                                         result |= (1 << i);
1645                 unlock_kernel();
1646                 return put_user(result, (unsigned long __user *)argp);
1647         case MOXA_GETDATACOUNT:
1648                 lock_kernel();
1649                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1650                         ret = -EFAULT;
1651                 unlock_kernel();
1652                 return ret;
1653         case MOXA_GETMSTATUS: {
1654                 struct mxser_mstatus ms, __user *msu = argp;
1655                 lock_kernel();
1656                 for (i = 0; i < MXSER_BOARDS; i++)
1657                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1658                                 port = &mxser_boards[i].ports[j];
1659                                 memset(&ms, 0, sizeof(ms));
1660
1661                                 if (!port->ioaddr)
1662                                         goto copy;
1663
1664                                 tty = tty_port_tty_get(&port->port);
1665
1666                                 if (!tty || !tty->termios)
1667                                         ms.cflag = port->normal_termios.c_cflag;
1668                                 else
1669                                         ms.cflag = tty->termios->c_cflag;
1670                                 tty_kref_put(tty);
1671                                 status = inb(port->ioaddr + UART_MSR);
1672                                 if (status & UART_MSR_DCD)
1673                                         ms.dcd = 1;
1674                                 if (status & UART_MSR_DSR)
1675                                         ms.dsr = 1;
1676                                 if (status & UART_MSR_CTS)
1677                                         ms.cts = 1;
1678                         copy:
1679                                 if (copy_to_user(msu, &ms, sizeof(ms))) {
1680                                         unlock_kernel();
1681                                         return -EFAULT;
1682                                 }
1683                                 msu++;
1684                         }
1685                 unlock_kernel();
1686                 return 0;
1687         }
1688         case MOXA_ASPP_MON_EXT: {
1689                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1690                 unsigned int cflag, iflag, p;
1691                 u8 opmode;
1692
1693                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1694                 if (!me)
1695                         return -ENOMEM;
1696
1697                 lock_kernel();
1698                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1699                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1700                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1701                                         i = MXSER_BOARDS;
1702                                         break;
1703                                 }
1704                                 port = &mxser_boards[i].ports[j];
1705                                 if (!port->ioaddr)
1706                                         continue;
1707
1708                                 status = mxser_get_msr(port->ioaddr, 0, p);
1709
1710                                 if (status & UART_MSR_TERI)
1711                                         port->icount.rng++;
1712                                 if (status & UART_MSR_DDSR)
1713                                         port->icount.dsr++;
1714                                 if (status & UART_MSR_DDCD)
1715                                         port->icount.dcd++;
1716                                 if (status & UART_MSR_DCTS)
1717                                         port->icount.cts++;
1718
1719                                 port->mon_data.modem_status = status;
1720                                 me->rx_cnt[p] = port->mon_data.rxcnt;
1721                                 me->tx_cnt[p] = port->mon_data.txcnt;
1722                                 me->up_rxcnt[p] = port->mon_data.up_rxcnt;
1723                                 me->up_txcnt[p] = port->mon_data.up_txcnt;
1724                                 me->modem_status[p] =
1725                                         port->mon_data.modem_status;
1726                                 tty = tty_port_tty_get(&port->port);
1727
1728                                 if (!tty || !tty->termios) {
1729                                         cflag = port->normal_termios.c_cflag;
1730                                         iflag = port->normal_termios.c_iflag;
1731                                         me->baudrate[p] = tty_termios_baud_rate(&port->normal_termios);
1732                                 } else {
1733                                         cflag = tty->termios->c_cflag;
1734                                         iflag = tty->termios->c_iflag;
1735                                         me->baudrate[p] = tty_get_baud_rate(tty);
1736                                 }
1737                                 tty_kref_put(tty);
1738
1739                                 me->databits[p] = cflag & CSIZE;
1740                                 me->stopbits[p] = cflag & CSTOPB;
1741                                 me->parity[p] = cflag & (PARENB | PARODD |
1742                                                 CMSPAR);
1743
1744                                 if (cflag & CRTSCTS)
1745                                         me->flowctrl[p] |= 0x03;
1746
1747                                 if (iflag & (IXON | IXOFF))
1748                                         me->flowctrl[p] |= 0x0C;
1749
1750                                 if (port->type == PORT_16550A)
1751                                         me->fifo[p] = 1;
1752
1753                                 opmode = inb(port->opmode_ioaddr) >>
1754                                                 ((p % 4) * 2);
1755                                 opmode &= OP_MODE_MASK;
1756                                 me->iftype[p] = opmode;
1757                         }
1758                 }
1759                 unlock_kernel();
1760                 if (copy_to_user(argp, me, sizeof(*me)))
1761                         ret = -EFAULT;
1762                 kfree(me);
1763                 return ret;
1764         }
1765         default:
1766                 return -ENOIOCTLCMD;
1767         }
1768         return 0;
1769 }
1770
1771 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1772                 struct async_icount *cprev)
1773 {
1774         struct async_icount cnow;
1775         unsigned long flags;
1776         int ret;
1777
1778         spin_lock_irqsave(&info->slock, flags);
1779         cnow = info->icount;    /* atomic copy */
1780         spin_unlock_irqrestore(&info->slock, flags);
1781
1782         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1783                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1784                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1785                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1786
1787         *cprev = cnow;
1788
1789         return ret;
1790 }
1791
1792 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1793                 unsigned int cmd, unsigned long arg)
1794 {
1795         struct mxser_port *info = tty->driver_data;
1796         struct async_icount cnow;
1797         unsigned long flags;
1798         void __user *argp = (void __user *)arg;
1799         int retval;
1800
1801         if (tty->index == MXSER_PORTS)
1802                 return mxser_ioctl_special(cmd, argp);
1803
1804         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1805                 int p;
1806                 unsigned long opmode;
1807                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1808                 int shiftbit;
1809                 unsigned char val, mask;
1810
1811                 p = tty->index % 4;
1812                 if (cmd == MOXA_SET_OP_MODE) {
1813                         if (get_user(opmode, (int __user *) argp))
1814                                 return -EFAULT;
1815                         if (opmode != RS232_MODE &&
1816                                         opmode != RS485_2WIRE_MODE &&
1817                                         opmode != RS422_MODE &&
1818                                         opmode != RS485_4WIRE_MODE)
1819                                 return -EFAULT;
1820                         lock_kernel();
1821                         mask = ModeMask[p];
1822                         shiftbit = p * 2;
1823                         val = inb(info->opmode_ioaddr);
1824                         val &= mask;
1825                         val |= (opmode << shiftbit);
1826                         outb(val, info->opmode_ioaddr);
1827                         unlock_kernel();
1828                 } else {
1829                         lock_kernel();
1830                         shiftbit = p * 2;
1831                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1832                         opmode &= OP_MODE_MASK;
1833                         unlock_kernel();
1834                         if (put_user(opmode, (int __user *)argp))
1835                                 return -EFAULT;
1836                 }
1837                 return 0;
1838         }
1839
1840         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
1841                         test_bit(TTY_IO_ERROR, &tty->flags))
1842                 return -EIO;
1843
1844         switch (cmd) {
1845         case TIOCGSERIAL:
1846                 lock_kernel();
1847                 retval = mxser_get_serial_info(tty, argp);
1848                 unlock_kernel();
1849                 return retval;
1850         case TIOCSSERIAL:
1851                 lock_kernel();
1852                 retval = mxser_set_serial_info(tty, argp);
1853                 unlock_kernel();
1854                 return retval;
1855         case TIOCSERGETLSR:     /* Get line status register */
1856                 return  mxser_get_lsr_info(info, argp);
1857                 /*
1858                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1859                  * - mask passed in arg for lines of interest
1860                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1861                  * Caller should use TIOCGICOUNT to see which one it was
1862                  */
1863         case TIOCMIWAIT:
1864                 spin_lock_irqsave(&info->slock, flags);
1865                 cnow = info->icount;    /* note the counters on entry */
1866                 spin_unlock_irqrestore(&info->slock, flags);
1867
1868                 return wait_event_interruptible(info->delta_msr_wait,
1869                                 mxser_cflags_changed(info, arg, &cnow));
1870         /*
1871          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1872          * Return: write counters to the user passed counter struct
1873          * NB: both 1->0 and 0->1 transitions are counted except for
1874          *     RI where only 0->1 is counted.
1875          */
1876         case TIOCGICOUNT: {
1877                 struct serial_icounter_struct icnt = { 0 };
1878                 spin_lock_irqsave(&info->slock, flags);
1879                 cnow = info->icount;
1880                 spin_unlock_irqrestore(&info->slock, flags);
1881
1882                 icnt.frame = cnow.frame;
1883                 icnt.brk = cnow.brk;
1884                 icnt.overrun = cnow.overrun;
1885                 icnt.buf_overrun = cnow.buf_overrun;
1886                 icnt.parity = cnow.parity;
1887                 icnt.rx = cnow.rx;
1888                 icnt.tx = cnow.tx;
1889                 icnt.cts = cnow.cts;
1890                 icnt.dsr = cnow.dsr;
1891                 icnt.rng = cnow.rng;
1892                 icnt.dcd = cnow.dcd;
1893
1894                 return copy_to_user(argp, &icnt, sizeof(icnt)) ? -EFAULT : 0;
1895         }
1896         case MOXA_HighSpeedOn:
1897                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1898         case MOXA_SDS_RSTICOUNTER:
1899                 lock_kernel();
1900                 info->mon_data.rxcnt = 0;
1901                 info->mon_data.txcnt = 0;
1902                 unlock_kernel();
1903                 return 0;
1904
1905         case MOXA_ASPP_OQUEUE:{
1906                 int len, lsr;
1907
1908                 lock_kernel();
1909                 len = mxser_chars_in_buffer(tty);
1910                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;
1911                 len += (lsr ? 0 : 1);
1912                 unlock_kernel();
1913
1914                 return put_user(len, (int __user *)argp);
1915         }
1916         case MOXA_ASPP_MON: {
1917                 int mcr, status;
1918
1919                 lock_kernel();
1920                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1921                 mxser_check_modem_status(tty, info, status);
1922
1923                 mcr = inb(info->ioaddr + UART_MCR);
1924                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1925                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1926                 else
1927                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1928
1929                 if (mcr & MOXA_MUST_MCR_TX_XON)
1930                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1931                 else
1932                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1933
1934                 if (tty->hw_stopped)
1935                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1936                 else
1937                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1938                 unlock_kernel();
1939                 if (copy_to_user(argp, &info->mon_data,
1940                                 sizeof(struct mxser_mon)))
1941                         return -EFAULT;
1942
1943                 return 0;
1944         }
1945         case MOXA_ASPP_LSTATUS: {
1946                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1947                         return -EFAULT;
1948
1949                 info->err_shadow = 0;
1950                 return 0;
1951         }
1952         case MOXA_SET_BAUD_METHOD: {
1953                 int method;
1954
1955                 if (get_user(method, (int __user *)argp))
1956                         return -EFAULT;
1957                 mxser_set_baud_method[tty->index] = method;
1958                 return put_user(method, (int __user *)argp);
1959         }
1960         default:
1961                 return -ENOIOCTLCMD;
1962         }
1963         return 0;
1964 }
1965
1966 static void mxser_stoprx(struct tty_struct *tty)
1967 {
1968         struct mxser_port *info = tty->driver_data;
1969
1970         info->ldisc_stop_rx = 1;
1971         if (I_IXOFF(tty)) {
1972                 if (info->board->chip_flag) {
1973                         info->IER &= ~MOXA_MUST_RECV_ISR;
1974                         outb(info->IER, info->ioaddr + UART_IER);
1975                 } else {
1976                         info->x_char = STOP_CHAR(tty);
1977                         outb(0, info->ioaddr + UART_IER);
1978                         info->IER |= UART_IER_THRI;
1979                         outb(info->IER, info->ioaddr + UART_IER);
1980                 }
1981         }
1982
1983         if (tty->termios->c_cflag & CRTSCTS) {
1984                 info->MCR &= ~UART_MCR_RTS;
1985                 outb(info->MCR, info->ioaddr + UART_MCR);
1986         }
1987 }
1988
1989 /*
1990  * This routine is called by the upper-layer tty layer to signal that
1991  * incoming characters should be throttled.
1992  */
1993 static void mxser_throttle(struct tty_struct *tty)
1994 {
1995         mxser_stoprx(tty);
1996 }
1997
1998 static void mxser_unthrottle(struct tty_struct *tty)
1999 {
2000         struct mxser_port *info = tty->driver_data;
2001
2002         /* startrx */
2003         info->ldisc_stop_rx = 0;
2004         if (I_IXOFF(tty)) {
2005                 if (info->x_char)
2006                         info->x_char = 0;
2007                 else {
2008                         if (info->board->chip_flag) {
2009                                 info->IER |= MOXA_MUST_RECV_ISR;
2010                                 outb(info->IER, info->ioaddr + UART_IER);
2011                         } else {
2012                                 info->x_char = START_CHAR(tty);
2013                                 outb(0, info->ioaddr + UART_IER);
2014                                 info->IER |= UART_IER_THRI;
2015                                 outb(info->IER, info->ioaddr + UART_IER);
2016                         }
2017                 }
2018         }
2019
2020         if (tty->termios->c_cflag & CRTSCTS) {
2021                 info->MCR |= UART_MCR_RTS;
2022                 outb(info->MCR, info->ioaddr + UART_MCR);
2023         }
2024 }
2025
2026 /*
2027  * mxser_stop() and mxser_start()
2028  *
2029  * This routines are called before setting or resetting tty->stopped.
2030  * They enable or disable transmitter interrupts, as necessary.
2031  */
2032 static void mxser_stop(struct tty_struct *tty)
2033 {
2034         struct mxser_port *info = tty->driver_data;
2035         unsigned long flags;
2036
2037         spin_lock_irqsave(&info->slock, flags);
2038         if (info->IER & UART_IER_THRI) {
2039                 info->IER &= ~UART_IER_THRI;
2040                 outb(info->IER, info->ioaddr + UART_IER);
2041         }
2042         spin_unlock_irqrestore(&info->slock, flags);
2043 }
2044
2045 static void mxser_start(struct tty_struct *tty)
2046 {
2047         struct mxser_port *info = tty->driver_data;
2048         unsigned long flags;
2049
2050         spin_lock_irqsave(&info->slock, flags);
2051         if (info->xmit_cnt && info->port.xmit_buf) {
2052                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
2053                 info->IER |= UART_IER_THRI;
2054                 outb(info->IER, info->ioaddr + UART_IER);
2055         }
2056         spin_unlock_irqrestore(&info->slock, flags);
2057 }
2058
2059 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2060 {
2061         struct mxser_port *info = tty->driver_data;
2062         unsigned long flags;
2063
2064         spin_lock_irqsave(&info->slock, flags);
2065         mxser_change_speed(tty, old_termios);
2066         spin_unlock_irqrestore(&info->slock, flags);
2067
2068         if ((old_termios->c_cflag & CRTSCTS) &&
2069                         !(tty->termios->c_cflag & CRTSCTS)) {
2070                 tty->hw_stopped = 0;
2071                 mxser_start(tty);
2072         }
2073
2074         /* Handle sw stopped */
2075         if ((old_termios->c_iflag & IXON) &&
2076                         !(tty->termios->c_iflag & IXON)) {
2077                 tty->stopped = 0;
2078
2079                 if (info->board->chip_flag) {
2080                         spin_lock_irqsave(&info->slock, flags);
2081                         mxser_disable_must_rx_software_flow_control(
2082                                         info->ioaddr);
2083                         spin_unlock_irqrestore(&info->slock, flags);
2084                 }
2085
2086                 mxser_start(tty);
2087         }
2088 }
2089
2090 /*
2091  * mxser_wait_until_sent() --- wait until the transmitter is empty
2092  */
2093 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
2094 {
2095         struct mxser_port *info = tty->driver_data;
2096         unsigned long orig_jiffies, char_time;
2097         int lsr;
2098
2099         if (info->type == PORT_UNKNOWN)
2100                 return;
2101
2102         if (info->xmit_fifo_size == 0)
2103                 return;         /* Just in case.... */
2104
2105         orig_jiffies = jiffies;
2106         /*
2107          * Set the check interval to be 1/5 of the estimated time to
2108          * send a single character, and make it at least 1.  The check
2109          * interval should also be less than the timeout.
2110          *
2111          * Note: we have to use pretty tight timings here to satisfy
2112          * the NIST-PCTS.
2113          */
2114         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2115         char_time = char_time / 5;
2116         if (char_time == 0)
2117                 char_time = 1;
2118         if (timeout && timeout < char_time)
2119                 char_time = timeout;
2120         /*
2121          * If the transmitter hasn't cleared in twice the approximate
2122          * amount of time to send the entire FIFO, it probably won't
2123          * ever clear.  This assumes the UART isn't doing flow
2124          * control, which is currently the case.  Hence, if it ever
2125          * takes longer than info->timeout, this is probably due to a
2126          * UART bug of some kind.  So, we clamp the timeout parameter at
2127          * 2*info->timeout.
2128          */
2129         if (!timeout || timeout > 2 * info->timeout)
2130                 timeout = 2 * info->timeout;
2131 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2132         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2133                 timeout, char_time);
2134         printk("jiff=%lu...", jiffies);
2135 #endif
2136         lock_kernel();
2137         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2138 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2139                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2140 #endif
2141                 schedule_timeout_interruptible(char_time);
2142                 if (signal_pending(current))
2143                         break;
2144                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2145                         break;
2146         }
2147         set_current_state(TASK_RUNNING);
2148         unlock_kernel();
2149
2150 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2151         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2152 #endif
2153 }
2154
2155 /*
2156  * This routine is called by tty_hangup() when a hangup is signaled.
2157  */
2158 static void mxser_hangup(struct tty_struct *tty)
2159 {
2160         struct mxser_port *info = tty->driver_data;
2161
2162         mxser_flush_buffer(tty);
2163         mxser_shutdown(tty);
2164         info->port.count = 0;
2165         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
2166         tty_port_tty_set(&info->port, NULL);
2167         wake_up_interruptible(&info->port.open_wait);
2168 }
2169
2170 /*
2171  * mxser_rs_break() --- routine which turns the break handling on or off
2172  */
2173 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2174 {
2175         struct mxser_port *info = tty->driver_data;
2176         unsigned long flags;
2177
2178         spin_lock_irqsave(&info->slock, flags);
2179         if (break_state == -1)
2180                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2181                         info->ioaddr + UART_LCR);
2182         else
2183                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2184                         info->ioaddr + UART_LCR);
2185         spin_unlock_irqrestore(&info->slock, flags);
2186         return 0;
2187 }
2188
2189 static void mxser_receive_chars(struct tty_struct *tty,
2190                                 struct mxser_port *port, int *status)
2191 {
2192         unsigned char ch, gdl;
2193         int ignored = 0;
2194         int cnt = 0;
2195         int recv_room;
2196         int max = 256;
2197
2198         recv_room = tty->receive_room;
2199         if (recv_room == 0 && !port->ldisc_stop_rx)
2200                 mxser_stoprx(tty);
2201         if (port->board->chip_flag != MOXA_OTHER_UART) {
2202
2203                 if (*status & UART_LSR_SPECIAL)
2204                         goto intr_old;
2205                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2206                                 (*status & MOXA_MUST_LSR_RERR))
2207                         goto intr_old;
2208                 if (*status & MOXA_MUST_LSR_RERR)
2209                         goto intr_old;
2210
2211                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2212
2213                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2214                         gdl &= MOXA_MUST_GDL_MASK;
2215                 if (gdl >= recv_room) {
2216                         if (!port->ldisc_stop_rx)
2217                                 mxser_stoprx(tty);
2218                 }
2219                 while (gdl--) {
2220                         ch = inb(port->ioaddr + UART_RX);
2221                         tty_insert_flip_char(tty, ch, 0);
2222                         cnt++;
2223                 }
2224                 goto end_intr;
2225         }
2226 intr_old:
2227
2228         do {
2229                 if (max-- < 0)
2230                         break;
2231
2232                 ch = inb(port->ioaddr + UART_RX);
2233                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2234                         outb(0x23, port->ioaddr + UART_FCR);
2235                 *status &= port->read_status_mask;
2236                 if (*status & port->ignore_status_mask) {
2237                         if (++ignored > 100)
2238                                 break;
2239                 } else {
2240                         char flag = 0;
2241                         if (*status & UART_LSR_SPECIAL) {
2242                                 if (*status & UART_LSR_BI) {
2243                                         flag = TTY_BREAK;
2244                                         port->icount.brk++;
2245
2246                                         if (port->port.flags & ASYNC_SAK)
2247                                                 do_SAK(tty);
2248                                 } else if (*status & UART_LSR_PE) {
2249                                         flag = TTY_PARITY;
2250                                         port->icount.parity++;
2251                                 } else if (*status & UART_LSR_FE) {
2252                                         flag = TTY_FRAME;
2253                                         port->icount.frame++;
2254                                 } else if (*status & UART_LSR_OE) {
2255                                         flag = TTY_OVERRUN;
2256                                         port->icount.overrun++;
2257                                 } else
2258                                         flag = TTY_BREAK;
2259                         }
2260                         tty_insert_flip_char(tty, ch, flag);
2261                         cnt++;
2262                         if (cnt >= recv_room) {
2263                                 if (!port->ldisc_stop_rx)
2264                                         mxser_stoprx(tty);
2265                                 break;
2266                         }
2267
2268                 }
2269
2270                 if (port->board->chip_flag)
2271                         break;
2272
2273                 *status = inb(port->ioaddr + UART_LSR);
2274         } while (*status & UART_LSR_DR);
2275
2276 end_intr:
2277         mxvar_log.rxcnt[tty->index] += cnt;
2278         port->mon_data.rxcnt += cnt;
2279         port->mon_data.up_rxcnt += cnt;
2280
2281         /*
2282          * We are called from an interrupt context with &port->slock
2283          * being held. Drop it temporarily in order to prevent
2284          * recursive locking.
2285          */
2286         spin_unlock(&port->slock);
2287         tty_flip_buffer_push(tty);
2288         spin_lock(&port->slock);
2289 }
2290
2291 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2292 {
2293         int count, cnt;
2294
2295         if (port->x_char) {
2296                 outb(port->x_char, port->ioaddr + UART_TX);
2297                 port->x_char = 0;
2298                 mxvar_log.txcnt[tty->index]++;
2299                 port->mon_data.txcnt++;
2300                 port->mon_data.up_txcnt++;
2301                 port->icount.tx++;
2302                 return;
2303         }
2304
2305         if (port->port.xmit_buf == NULL)
2306                 return;
2307
2308         if (port->xmit_cnt <= 0 || tty->stopped ||
2309                         (tty->hw_stopped &&
2310                         (port->type != PORT_16550A) &&
2311                         (!port->board->chip_flag))) {
2312                 port->IER &= ~UART_IER_THRI;
2313                 outb(port->IER, port->ioaddr + UART_IER);
2314                 return;
2315         }
2316
2317         cnt = port->xmit_cnt;
2318         count = port->xmit_fifo_size;
2319         do {
2320                 outb(port->port.xmit_buf[port->xmit_tail++],
2321                         port->ioaddr + UART_TX);
2322                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2323                 if (--port->xmit_cnt <= 0)
2324                         break;
2325         } while (--count > 0);
2326         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2327
2328         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2329         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2330         port->icount.tx += (cnt - port->xmit_cnt);
2331
2332         if (port->xmit_cnt < WAKEUP_CHARS && tty)
2333                 tty_wakeup(tty);
2334
2335         if (port->xmit_cnt <= 0) {
2336                 port->IER &= ~UART_IER_THRI;
2337                 outb(port->IER, port->ioaddr + UART_IER);
2338         }
2339 }
2340
2341 /*
2342  * This is the serial driver's generic interrupt routine
2343  */
2344 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2345 {
2346         int status, iir, i;
2347         struct mxser_board *brd = NULL;
2348         struct mxser_port *port;
2349         int max, irqbits, bits, msr;
2350         unsigned int int_cnt, pass_counter = 0;
2351         int handled = IRQ_NONE;
2352         struct tty_struct *tty;
2353
2354         for (i = 0; i < MXSER_BOARDS; i++)
2355                 if (dev_id == &mxser_boards[i]) {
2356                         brd = dev_id;
2357                         break;
2358                 }
2359
2360         if (i == MXSER_BOARDS)
2361                 goto irq_stop;
2362         if (brd == NULL)
2363                 goto irq_stop;
2364         max = brd->info->nports;
2365         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2366                 irqbits = inb(brd->vector) & brd->vector_mask;
2367                 if (irqbits == brd->vector_mask)
2368                         break;
2369
2370                 handled = IRQ_HANDLED;
2371                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2372                         if (irqbits == brd->vector_mask)
2373                                 break;
2374                         if (bits & irqbits)
2375                                 continue;
2376                         port = &brd->ports[i];
2377
2378                         int_cnt = 0;
2379                         spin_lock(&port->slock);
2380                         do {
2381                                 iir = inb(port->ioaddr + UART_IIR);
2382                                 if (iir & UART_IIR_NO_INT)
2383                                         break;
2384                                 iir &= MOXA_MUST_IIR_MASK;
2385                                 tty = tty_port_tty_get(&port->port);
2386                                 if (!tty ||
2387                                                 (port->port.flags & ASYNC_CLOSING) ||
2388                                                 !(port->port.flags &
2389                                                         ASYNC_INITIALIZED)) {
2390                                         status = inb(port->ioaddr + UART_LSR);
2391                                         outb(0x27, port->ioaddr + UART_FCR);
2392                                         inb(port->ioaddr + UART_MSR);
2393                                         tty_kref_put(tty);
2394                                         break;
2395                                 }
2396
2397                                 status = inb(port->ioaddr + UART_LSR);
2398
2399                                 if (status & UART_LSR_PE)
2400                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2401                                 if (status & UART_LSR_FE)
2402                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2403                                 if (status & UART_LSR_OE)
2404                                         port->err_shadow |=
2405                                                 NPPI_NOTIFY_HW_OVERRUN;
2406                                 if (status & UART_LSR_BI)
2407                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2408
2409                                 if (port->board->chip_flag) {
2410                                         if (iir == MOXA_MUST_IIR_GDA ||
2411                                             iir == MOXA_MUST_IIR_RDA ||
2412                                             iir == MOXA_MUST_IIR_RTO ||
2413                                             iir == MOXA_MUST_IIR_LSR)
2414                                                 mxser_receive_chars(tty, port,
2415                                                                 &status);
2416
2417                                 } else {
2418                                         status &= port->read_status_mask;
2419                                         if (status & UART_LSR_DR)
2420                                                 mxser_receive_chars(tty, port,
2421                                                                 &status);
2422                                 }
2423                                 msr = inb(port->ioaddr + UART_MSR);
2424                                 if (msr & UART_MSR_ANY_DELTA)
2425                                         mxser_check_modem_status(tty, port, msr);
2426
2427                                 if (port->board->chip_flag) {
2428                                         if (iir == 0x02 && (status &
2429                                                                 UART_LSR_THRE))
2430                                                 mxser_transmit_chars(tty, port);
2431                                 } else {
2432                                         if (status & UART_LSR_THRE)
2433                                                 mxser_transmit_chars(tty, port);
2434                                 }
2435                                 tty_kref_put(tty);
2436                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2437                         spin_unlock(&port->slock);
2438                 }
2439         }
2440
2441 irq_stop:
2442         return handled;
2443 }
2444
2445 static const struct tty_operations mxser_ops = {
2446         .open = mxser_open,
2447         .close = mxser_close,
2448         .write = mxser_write,
2449         .put_char = mxser_put_char,
2450         .flush_chars = mxser_flush_chars,
2451         .write_room = mxser_write_room,
2452         .chars_in_buffer = mxser_chars_in_buffer,
2453         .flush_buffer = mxser_flush_buffer,
2454         .ioctl = mxser_ioctl,
2455         .throttle = mxser_throttle,
2456         .unthrottle = mxser_unthrottle,
2457         .set_termios = mxser_set_termios,
2458         .stop = mxser_stop,
2459         .start = mxser_start,
2460         .hangup = mxser_hangup,
2461         .break_ctl = mxser_rs_break,
2462         .wait_until_sent = mxser_wait_until_sent,
2463         .tiocmget = mxser_tiocmget,
2464         .tiocmset = mxser_tiocmset,
2465 };
2466
2467 struct tty_port_operations mxser_port_ops = {
2468         .carrier_raised = mxser_carrier_raised,
2469         .raise_dtr_rts = mxser_raise_dtr_rts,
2470 };
2471
2472 /*
2473  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2474  */
2475
2476 static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
2477                 unsigned int irq)
2478 {
2479         if (irq)
2480                 free_irq(brd->irq, brd);
2481         if (pdev != NULL) {     /* PCI */
2482 #ifdef CONFIG_PCI
2483                 pci_release_region(pdev, 2);
2484                 pci_release_region(pdev, 3);
2485 #endif
2486         } else {
2487                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2488                 release_region(brd->vector, 1);
2489         }
2490 }
2491
2492 static int __devinit mxser_initbrd(struct mxser_board *brd,
2493                 struct pci_dev *pdev)
2494 {
2495         struct mxser_port *info;
2496         unsigned int i;
2497         int retval;
2498
2499         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2500                         brd->ports[0].max_baud);
2501
2502         for (i = 0; i < brd->info->nports; i++) {
2503                 info = &brd->ports[i];
2504                 tty_port_init(&info->port);
2505                 info->port.ops = &mxser_port_ops;
2506                 info->board = brd;
2507                 info->stop_rx = 0;
2508                 info->ldisc_stop_rx = 0;
2509
2510                 /* Enhance mode enabled here */
2511                 if (brd->chip_flag != MOXA_OTHER_UART)
2512                         mxser_enable_must_enchance_mode(info->ioaddr);
2513
2514                 info->port.flags = ASYNC_SHARE_IRQ;
2515                 info->type = brd->uart_type;
2516
2517                 process_txrx_fifo(info);
2518
2519                 info->custom_divisor = info->baud_base * 16;
2520                 info->port.close_delay = 5 * HZ / 10;
2521                 info->port.closing_wait = 30 * HZ;
2522                 info->normal_termios = mxvar_sdriver->init_termios;
2523                 init_waitqueue_head(&info->delta_msr_wait);
2524                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2525                 info->err_shadow = 0;
2526                 spin_lock_init(&info->slock);
2527
2528                 /* before set INT ISR, disable all int */
2529                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2530                         info->ioaddr + UART_IER);
2531         }
2532
2533         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2534                         brd);
2535         if (retval) {
2536                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2537                         "conflict with another device.\n",
2538                         brd->info->name, brd->irq);
2539                 /* We hold resources, we need to release them. */
2540                 mxser_release_res(brd, pdev, 0);
2541         }
2542         return retval;
2543 }
2544
2545 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2546 {
2547         int id, i, bits;
2548         unsigned short regs[16], irq;
2549         unsigned char scratch, scratch2;
2550
2551         brd->chip_flag = MOXA_OTHER_UART;
2552
2553         id = mxser_read_register(cap, regs);
2554         switch (id) {
2555         case C168_ASIC_ID:
2556                 brd->info = &mxser_cards[0];
2557                 break;
2558         case C104_ASIC_ID:
2559                 brd->info = &mxser_cards[1];
2560                 break;
2561         case CI104J_ASIC_ID:
2562                 brd->info = &mxser_cards[2];
2563                 break;
2564         case C102_ASIC_ID:
2565                 brd->info = &mxser_cards[5];
2566                 break;
2567         case CI132_ASIC_ID:
2568                 brd->info = &mxser_cards[6];
2569                 break;
2570         case CI134_ASIC_ID:
2571                 brd->info = &mxser_cards[7];
2572                 break;
2573         default:
2574                 return 0;
2575         }
2576
2577         irq = 0;
2578         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2579            Flag-hack checks if configuration should be read as 2-port here. */
2580         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2581                 irq = regs[9] & 0xF000;
2582                 irq = irq | (irq >> 4);
2583                 if (irq != (regs[9] & 0xFF00))
2584                         goto err_irqconflict;
2585         } else if (brd->info->nports == 4) {
2586                 irq = regs[9] & 0xF000;
2587                 irq = irq | (irq >> 4);
2588                 irq = irq | (irq >> 8);
2589                 if (irq != regs[9])
2590                         goto err_irqconflict;
2591         } else if (brd->info->nports == 8) {
2592                 irq = regs[9] & 0xF000;
2593                 irq = irq | (irq >> 4);
2594                 irq = irq | (irq >> 8);
2595                 if ((irq != regs[9]) || (irq != regs[10]))
2596                         goto err_irqconflict;
2597         }
2598
2599         if (!irq) {
2600                 printk(KERN_ERR "mxser: interrupt number unset\n");
2601                 return -EIO;
2602         }
2603         brd->irq = ((int)(irq & 0xF000) >> 12);
2604         for (i = 0; i < 8; i++)
2605                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2606         if ((regs[12] & 0x80) == 0) {
2607                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2608                 return -EIO;
2609         }
2610         brd->vector = (int)regs[11];    /* interrupt vector */
2611         if (id == 1)
2612                 brd->vector_mask = 0x00FF;
2613         else
2614                 brd->vector_mask = 0x000F;
2615         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2616                 if (regs[12] & bits) {
2617                         brd->ports[i].baud_base = 921600;
2618                         brd->ports[i].max_baud = 921600;
2619                 } else {
2620                         brd->ports[i].baud_base = 115200;
2621                         brd->ports[i].max_baud = 115200;
2622                 }
2623         }
2624         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2625         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2626         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2627         outb(scratch2, cap + UART_LCR);
2628         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2629         scratch = inb(cap + UART_IIR);
2630
2631         if (scratch & 0xC0)
2632                 brd->uart_type = PORT_16550A;
2633         else
2634                 brd->uart_type = PORT_16450;
2635         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2636                         "mxser(IO)")) {
2637                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2638                                 "0x%.8lx-0x%.8lx\n",
2639                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2640                                 8 * brd->info->nports - 1);
2641                 return -EIO;
2642         }
2643         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2644                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2645                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2646                                 "0x%.8lx-0x%.8lx\n",
2647                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2648                                 8 * brd->info->nports - 1);
2649                 return -EIO;
2650         }
2651         return brd->info->nports;
2652
2653 err_irqconflict:
2654         printk(KERN_ERR "mxser: invalid interrupt number\n");
2655         return -EIO;
2656 }
2657
2658 static int __devinit mxser_probe(struct pci_dev *pdev,
2659                 const struct pci_device_id *ent)
2660 {
2661 #ifdef CONFIG_PCI
2662         struct mxser_board *brd;
2663         unsigned int i, j;
2664         unsigned long ioaddress;
2665         int retval = -EINVAL;
2666
2667         for (i = 0; i < MXSER_BOARDS; i++)
2668                 if (mxser_boards[i].info == NULL)
2669                         break;
2670
2671         if (i >= MXSER_BOARDS) {
2672                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2673                                 "not configured\n", MXSER_BOARDS);
2674                 goto err;
2675         }
2676
2677         brd = &mxser_boards[i];
2678         brd->idx = i * MXSER_PORTS_PER_BOARD;
2679         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2680                 mxser_cards[ent->driver_data].name,
2681                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2682
2683         retval = pci_enable_device(pdev);
2684         if (retval) {
2685                 dev_err(&pdev->dev, "PCI enable failed\n");
2686                 goto err;
2687         }
2688
2689         /* io address */
2690         ioaddress = pci_resource_start(pdev, 2);
2691         retval = pci_request_region(pdev, 2, "mxser(IO)");
2692         if (retval)
2693                 goto err;
2694
2695         brd->info = &mxser_cards[ent->driver_data];
2696         for (i = 0; i < brd->info->nports; i++)
2697                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2698
2699         /* vector */
2700         ioaddress = pci_resource_start(pdev, 3);
2701         retval = pci_request_region(pdev, 3, "mxser(vector)");
2702         if (retval)
2703                 goto err_relio;
2704         brd->vector = ioaddress;
2705
2706         /* irq */
2707         brd->irq = pdev->irq;
2708
2709         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2710         brd->uart_type = PORT_16550A;
2711         brd->vector_mask = 0;
2712
2713         for (i = 0; i < brd->info->nports; i++) {
2714                 for (j = 0; j < UART_INFO_NUM; j++) {
2715                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2716                                 brd->ports[i].max_baud =
2717                                         Gpci_uart_info[j].max_baud;
2718
2719                                 /* exception....CP-102 */
2720                                 if (brd->info->flags & MXSER_HIGHBAUD)
2721                                         brd->ports[i].max_baud = 921600;
2722                                 break;
2723                         }
2724                 }
2725         }
2726
2727         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2728                 for (i = 0; i < brd->info->nports; i++) {
2729                         if (i < 4)
2730                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2731                         else
2732                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2733                 }
2734                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2735                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2736         }
2737
2738         for (i = 0; i < brd->info->nports; i++) {
2739                 brd->vector_mask |= (1 << i);
2740                 brd->ports[i].baud_base = 921600;
2741         }
2742
2743         /* mxser_initbrd will hook ISR. */
2744         retval = mxser_initbrd(brd, pdev);
2745         if (retval)
2746                 goto err_null;
2747
2748         for (i = 0; i < brd->info->nports; i++)
2749                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2750
2751         pci_set_drvdata(pdev, brd);
2752
2753         return 0;
2754 err_relio:
2755         pci_release_region(pdev, 2);
2756 err_null:
2757         brd->info = NULL;
2758 err:
2759         return retval;
2760 #else
2761         return -ENODEV;
2762 #endif
2763 }
2764
2765 static void __devexit mxser_remove(struct pci_dev *pdev)
2766 {
2767         struct mxser_board *brd = pci_get_drvdata(pdev);
2768         unsigned int i;
2769
2770         for (i = 0; i < brd->info->nports; i++)
2771                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2772
2773         mxser_release_res(brd, pdev, 1);
2774         brd->info = NULL;
2775 }
2776
2777 static struct pci_driver mxser_driver = {
2778         .name = "mxser",
2779         .id_table = mxser_pcibrds,
2780         .probe = mxser_probe,
2781         .remove = __devexit_p(mxser_remove)
2782 };
2783
2784 static int __init mxser_module_init(void)
2785 {
2786         struct mxser_board *brd;
2787         unsigned int b, i, m;
2788         int retval;
2789
2790         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2791         if (!mxvar_sdriver)
2792                 return -ENOMEM;
2793
2794         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2795                 MXSER_VERSION);
2796
2797         /* Initialize the tty_driver structure */
2798         mxvar_sdriver->owner = THIS_MODULE;
2799         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2800         mxvar_sdriver->name = "ttyMI";
2801         mxvar_sdriver->major = ttymajor;
2802         mxvar_sdriver->minor_start = 0;
2803         mxvar_sdriver->num = MXSER_PORTS + 1;
2804         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2805         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2806         mxvar_sdriver->init_termios = tty_std_termios;
2807         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2808         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2809         tty_set_operations(mxvar_sdriver, &mxser_ops);
2810
2811         retval = tty_register_driver(mxvar_sdriver);
2812         if (retval) {
2813                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2814                                 "tty driver !\n");
2815                 goto err_put;
2816         }
2817
2818         /* Start finding ISA boards here */
2819         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2820                 if (!ioaddr[b])
2821                         continue;
2822
2823                 brd = &mxser_boards[m];
2824                 retval = mxser_get_ISA_conf(!ioaddr[b], brd);
2825                 if (retval <= 0) {
2826                         brd->info = NULL;
2827                         continue;
2828                 }
2829
2830                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2831                                 brd->info->name, ioaddr[b]);
2832
2833                 /* mxser_initbrd will hook ISR. */
2834                 if (mxser_initbrd(brd, NULL) < 0) {
2835                         brd->info = NULL;
2836                         continue;
2837                 }
2838
2839                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2840                 for (i = 0; i < brd->info->nports; i++)
2841                         tty_register_device(mxvar_sdriver, brd->idx + i, NULL);
2842
2843                 m++;
2844         }
2845
2846         retval = pci_register_driver(&mxser_driver);
2847         if (retval) {
2848                 printk(KERN_ERR "mxser: can't register pci driver\n");
2849                 if (!m) {
2850                         retval = -ENODEV;
2851                         goto err_unr;
2852                 } /* else: we have some ISA cards under control */
2853         }
2854
2855         return 0;
2856 err_unr:
2857         tty_unregister_driver(mxvar_sdriver);
2858 err_put:
2859         put_tty_driver(mxvar_sdriver);
2860         return retval;
2861 }
2862
2863 static void __exit mxser_module_exit(void)
2864 {
2865         unsigned int i, j;
2866
2867         pci_unregister_driver(&mxser_driver);
2868
2869         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2870                 if (mxser_boards[i].info != NULL)
2871                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2872                                 tty_unregister_device(mxvar_sdriver,
2873                                                 mxser_boards[i].idx + j);
2874         tty_unregister_driver(mxvar_sdriver);
2875         put_tty_driver(mxvar_sdriver);
2876
2877         for (i = 0; i < MXSER_BOARDS; i++)
2878                 if (mxser_boards[i].info != NULL)
2879                         mxser_release_res(&mxser_boards[i], NULL, 1);
2880 }
2881
2882 module_init(mxser_module_init);
2883 module_exit(mxser_module_exit);