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