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