drivers/tty/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/ioport.h>
  37 #include <linux/mm.h>
  38 #include <linux/delay.h>
  39 #include <linux/pci.h>
  40 #include <linux/bitops.h>
  41 #include <linux/slab.h>
  42 #include <linux/ratelimit.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <linux/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.5"         /* 1.14 */
  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_CP112UL   0x1120
  72 #define PCI_DEVICE_ID_CB114     0x1142
  73 #define PCI_DEVICE_ID_CP114UL   0x1143
  74 #define PCI_DEVICE_ID_CB134I    0x1341
  75 #define PCI_DEVICE_ID_CP138U    0x1380
  76
  77
  78 #define C168_ASIC_ID    1
  79 #define C104_ASIC_ID    2
  80 #define C102_ASIC_ID    0xB
  81 #define CI132_ASIC_ID   4
  82 #define CI134_ASIC_ID   3
  83 #define CI104J_ASIC_ID  5
  84
  85 #define MXSER_HIGHBAUD  1
  86 #define MXSER_HAS2      2
  87
  88 /* This is only for PCI */
  89 static const struct {
  90         int type;
  91         int tx_fifo;
  92         int rx_fifo;
  93         int xmit_fifo_size;
  94         int rx_high_water;
  95         int rx_trigger;
  96         int rx_low_water;
  97         long max_baud;
  98 } Gpci_uart_info[] = {
  99         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 100         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 101         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 102 };
 103 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 104
 105 struct mxser_cardinfo {
 106         char *name;
 107         unsigned int nports;
 108         unsigned int flags;
 109 };
 110
 111 static const struct mxser_cardinfo mxser_cards[] = {
 112 /* 0*/  { "C168 series",        8, },
 113         { "C104 series",        4, },
 114         { "CI-104J series",     4, },
 115         { "C168H/PCI series",   8, },
 116         { "C104H/PCI series",   4, },
 117 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 118         { "CI-132 series",      4, MXSER_HAS2 },
 119         { "CI-134 series",      4, },
 120         { "CP-132 series",      2, },
 121         { "CP-114 series",      4, },
 122 /*10*/  { "CT-114 series",      4, },
 123         { "CP-102 series",      2, MXSER_HIGHBAUD },
 124         { "CP-104U series",     4, },
 125         { "CP-168U series",     8, },
 126         { "CP-132U series",     2, },
 127 /*15*/  { "CP-134U series",     4, },
 128         { "CP-104JU series",    4, },
 129         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 130         { "CP-118U series",     8, },
 131         { "CP-102UL series",    2, },
 132 /*20*/  { "CP-102U series",     2, },
 133         { "CP-118EL series",    8, },
 134         { "CP-168EL series",    8, },
 135         { "CP-104EL series",    4, },
 136         { "CB-108 series",      8, },
 137 /*25*/  { "CB-114 series",      4, },
 138         { "CB-134I series",     4, },
 139         { "CP-138U series",     8, },
 140         { "POS-104UL series",   4, },
 141         { "CP-114UL series",    4, },
 142 /*30*/  { "CP-102UF series",    2, },
 143         { "CP-112UL series",    2, },
 144 };
 145
 146 /* driver_data correspond to the lines in the structure above
 147    see also ISA probe function before you change something */
 148 static const struct pci_device_id mxser_pcibrds[] = {
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),     .driver_data = 31 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 178
 179 static unsigned long ioaddr[MXSER_BOARDS];
 180 static int ttymajor = MXSERMAJOR;
 181
 182 /* Variables for insmod */
 183
 184 MODULE_AUTHOR("Casper Yang");
 185 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 186 module_param_hw_array(ioaddr, ulong, ioport, NULL, 0);
 187 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 188 module_param(ttymajor, int, 0);
 189 MODULE_LICENSE("GPL");
 190
 191 struct mxser_log {
 192         int tick;
 193         unsigned long rxcnt[MXSER_PORTS];
 194         unsigned long txcnt[MXSER_PORTS];
 195 };
 196
 197 struct mxser_mon {
 198         unsigned long rxcnt;
 199         unsigned long txcnt;
 200         unsigned long up_rxcnt;
 201         unsigned long up_txcnt;
 202         int modem_status;
 203         unsigned char hold_reason;
 204 };
 205
 206 struct mxser_mon_ext {
 207         unsigned long rx_cnt[32];
 208         unsigned long tx_cnt[32];
 209         unsigned long up_rxcnt[32];
 210         unsigned long up_txcnt[32];
 211         int modem_status[32];
 212
 213         long baudrate[32];
 214         int databits[32];
 215         int stopbits[32];
 216         int parity[32];
 217         int flowctrl[32];
 218         int fifo[32];
 219         int iftype[32];
 220 };
 221
 222 struct mxser_board;
 223
 224 struct mxser_port {
 225         struct tty_port port;
 226         struct mxser_board *board;
 227
 228         unsigned long ioaddr;
 229         unsigned long opmode_ioaddr;
 230         int max_baud;
 231
 232         int rx_high_water;
 233         int rx_trigger;         /* Rx fifo trigger level */
 234         int rx_low_water;
 235         int baud_base;          /* max. speed */
 236         int type;               /* UART type */
 237
 238         int x_char;             /* xon/xoff character */
 239         int IER;                /* Interrupt Enable Register */
 240         int MCR;                /* Modem control register */
 241
 242         unsigned char stop_rx;
 243         unsigned char ldisc_stop_rx;
 244
 245         int custom_divisor;
 246         unsigned char err_shadow;
 247
 248         struct async_icount icount; /* kernel counters for 4 input interrupts */
 249         unsigned int timeout;
 250
 251         int read_status_mask;
 252         int ignore_status_mask;
 253         unsigned int xmit_fifo_size;
 254         int xmit_head;
 255         int xmit_tail;
 256         int xmit_cnt;
 257         int closing;
 258
 259         struct ktermios normal_termios;
 260
 261         struct mxser_mon mon_data;
 262
 263         spinlock_t slock;
 264 };
 265
 266 struct mxser_board {
 267         unsigned int idx;
 268         int irq;
 269         const struct mxser_cardinfo *info;
 270         unsigned long vector;
 271         unsigned long vector_mask;
 272
 273         int chip_flag;
 274         int uart_type;
 275
 276         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 277 };
 278
 279 struct mxser_mstatus {
 280         tcflag_t cflag;
 281         int cts;
 282         int dsr;
 283         int ri;
 284         int dcd;
 285 };
 286
 287 static struct mxser_board mxser_boards[MXSER_BOARDS];
 288 static struct tty_driver *mxvar_sdriver;
 289 static struct mxser_log mxvar_log;
 290 static int mxser_set_baud_method[MXSER_PORTS + 1];
 291
 292 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 293 {
 294         u8 oldlcr;
 295         u8 efr;
 296
 297         oldlcr = inb(baseio + UART_LCR);
 298         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 299
 300         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 301         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 302
 303         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 304         outb(oldlcr, baseio + UART_LCR);
 305 }
 306
 307 #ifdef  CONFIG_PCI
 308 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 309 {
 310         u8 oldlcr;
 311         u8 efr;
 312
 313         oldlcr = inb(baseio + UART_LCR);
 314         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 315
 316         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 317         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 318
 319         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 320         outb(oldlcr, baseio + UART_LCR);
 321 }
 322 #endif
 323
 324 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 325 {
 326         u8 oldlcr;
 327         u8 efr;
 328
 329         oldlcr = inb(baseio + UART_LCR);
 330         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 331
 332         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 333         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 334         efr |= MOXA_MUST_EFR_BANK0;
 335
 336         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 337         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 338         outb(oldlcr, baseio + UART_LCR);
 339 }
 340
 341 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 342 {
 343         u8 oldlcr;
 344         u8 efr;
 345
 346         oldlcr = inb(baseio + UART_LCR);
 347         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 348
 349         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 350         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 351         efr |= MOXA_MUST_EFR_BANK0;
 352
 353         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 354         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 355         outb(oldlcr, baseio + UART_LCR);
 356 }
 357
 358 static void mxser_set_must_fifo_value(struct mxser_port *info)
 359 {
 360         u8 oldlcr;
 361         u8 efr;
 362
 363         oldlcr = inb(info->ioaddr + UART_LCR);
 364         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 365
 366         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 367         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 368         efr |= MOXA_MUST_EFR_BANK1;
 369
 370         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 371         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 372         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 373         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 374         outb(oldlcr, info->ioaddr + UART_LCR);
 375 }
 376
 377 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 378 {
 379         u8 oldlcr;
 380         u8 efr;
 381
 382         oldlcr = inb(baseio + UART_LCR);
 383         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 384
 385         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 386         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 387         efr |= MOXA_MUST_EFR_BANK2;
 388
 389         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 390         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 391         outb(oldlcr, baseio + UART_LCR);
 392 }
 393
 394 #ifdef CONFIG_PCI
 395 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 396 {
 397         u8 oldlcr;
 398         u8 efr;
 399
 400         oldlcr = inb(baseio + UART_LCR);
 401         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 402
 403         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 404         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 405         efr |= MOXA_MUST_EFR_BANK2;
 406
 407         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 408         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 409         outb(oldlcr, baseio + UART_LCR);
 410 }
 411 #endif
 412
 413 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 414 {
 415         u8 oldlcr;
 416         u8 efr;
 417
 418         oldlcr = inb(baseio + UART_LCR);
 419         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 420
 421         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 422         efr &= ~MOXA_MUST_EFR_SF_MASK;
 423
 424         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 425         outb(oldlcr, baseio + UART_LCR);
 426 }
 427
 428 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 429 {
 430         u8 oldlcr;
 431         u8 efr;
 432
 433         oldlcr = inb(baseio + UART_LCR);
 434         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 435
 436         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 437         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 438         efr |= MOXA_MUST_EFR_SF_TX1;
 439
 440         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 441         outb(oldlcr, baseio + UART_LCR);
 442 }
 443
 444 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 445 {
 446         u8 oldlcr;
 447         u8 efr;
 448
 449         oldlcr = inb(baseio + UART_LCR);
 450         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 451
 452         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 453         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 454
 455         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 456         outb(oldlcr, baseio + UART_LCR);
 457 }
 458
 459 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 460 {
 461         u8 oldlcr;
 462         u8 efr;
 463
 464         oldlcr = inb(baseio + UART_LCR);
 465         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 466
 467         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 468         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 469         efr |= MOXA_MUST_EFR_SF_RX1;
 470
 471         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 472         outb(oldlcr, baseio + UART_LCR);
 473 }
 474
 475 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 476 {
 477         u8 oldlcr;
 478         u8 efr;
 479
 480         oldlcr = inb(baseio + UART_LCR);
 481         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 482
 483         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 484         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 485
 486         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 487         outb(oldlcr, baseio + UART_LCR);
 488 }
 489
 490 #ifdef CONFIG_PCI
 491 static int CheckIsMoxaMust(unsigned long io)
 492 {
 493         u8 oldmcr, hwid;
 494         int i;
 495
 496         outb(0, io + UART_LCR);
 497         mxser_disable_must_enchance_mode(io);
 498         oldmcr = inb(io + UART_MCR);
 499         outb(0, io + UART_MCR);
 500         mxser_set_must_xon1_value(io, 0x11);
 501         if ((hwid = inb(io + UART_MCR)) != 0) {
 502                 outb(oldmcr, io + UART_MCR);
 503                 return MOXA_OTHER_UART;
 504         }
 505
 506         mxser_get_must_hardware_id(io, &hwid);
 507         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 508                 if (hwid == Gpci_uart_info[i].type)
 509                         return (int)hwid;
 510         }
 511         return MOXA_OTHER_UART;
 512 }
 513 #endif
 514
 515 static void process_txrx_fifo(struct mxser_port *info)
 516 {
 517         int i;
 518
 519         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 520                 info->rx_trigger = 1;
 521                 info->rx_high_water = 1;
 522                 info->rx_low_water = 1;
 523                 info->xmit_fifo_size = 1;
 524         } else
 525                 for (i = 0; i < UART_INFO_NUM; i++)
 526                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 527                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 528                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 529                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 530                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 531                                 break;
 532                         }
 533 }
 534
 535 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 536 {
 537         static unsigned char mxser_msr[MXSER_PORTS + 1];
 538         unsigned char status = 0;
 539
 540         status = inb(baseaddr + UART_MSR);
 541
 542         mxser_msr[port] &= 0x0F;
 543         mxser_msr[port] |= status;
 544         status = mxser_msr[port];
 545         if (mode)
 546                 mxser_msr[port] = 0;
 547
 548         return status;
 549 }
 550
 551 static int mxser_carrier_raised(struct tty_port *port)
 552 {
 553         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 554         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
 555 }
 556
 557 static void mxser_dtr_rts(struct tty_port *port, int on)
 558 {
 559         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 560         unsigned long flags;
 561
 562         spin_lock_irqsave(&mp->slock, flags);
 563         if (on)
 564                 outb(inb(mp->ioaddr + UART_MCR) |
 565                         UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
 566         else
 567                 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
 568                         mp->ioaddr + UART_MCR);
 569         spin_unlock_irqrestore(&mp->slock, flags);
 570 }
 571
 572 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 573 {
 574         struct mxser_port *info = tty->driver_data;
 575         unsigned int quot = 0, baud;
 576         unsigned char cval;
 577         u64 timeout;
 578
 579         if (!info->ioaddr)
 580                 return -1;
 581
 582         if (newspd > info->max_baud)
 583                 return -1;
 584
 585         if (newspd == 134) {
 586                 quot = 2 * info->baud_base / 269;
 587                 tty_encode_baud_rate(tty, 134, 134);
 588         } else if (newspd) {
 589                 quot = info->baud_base / newspd;
 590                 if (quot == 0)
 591                         quot = 1;
 592                 baud = info->baud_base/quot;
 593                 tty_encode_baud_rate(tty, baud, baud);
 594         } else {
 595                 quot = 0;
 596         }
 597
 598         /*
 599          * worst case (128 * 1000 * 10 * 18432) needs 35 bits, so divide in the
 600          * u64 domain
 601          */
 602         timeout = (u64)info->xmit_fifo_size * HZ * 10 * quot;
 603         do_div(timeout, info->baud_base);
 604         info->timeout = timeout + HZ / 50; /* Add .02 seconds of slop */
 605
 606         if (quot) {
 607                 info->MCR |= UART_MCR_DTR;
 608                 outb(info->MCR, info->ioaddr + UART_MCR);
 609         } else {
 610                 info->MCR &= ~UART_MCR_DTR;
 611                 outb(info->MCR, info->ioaddr + UART_MCR);
 612                 return 0;
 613         }
 614
 615         cval = inb(info->ioaddr + UART_LCR);
 616
 617         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 618
 619         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 620         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 621         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 622
 623 #ifdef BOTHER
 624         if (C_BAUD(tty) == BOTHER) {
 625                 quot = info->baud_base % newspd;
 626                 quot *= 8;
 627                 if (quot % newspd > newspd / 2) {
 628                         quot /= newspd;
 629                         quot++;
 630                 } else
 631                         quot /= newspd;
 632
 633                 mxser_set_must_enum_value(info->ioaddr, quot);
 634         } else
 635 #endif
 636                 mxser_set_must_enum_value(info->ioaddr, 0);
 637
 638         return 0;
 639 }
 640
 641 /*
 642  * This routine is called to set the UART divisor registers to match
 643  * the specified baud rate for a serial port.
 644  */
 645 static int mxser_change_speed(struct tty_struct *tty,
 646                                         struct ktermios *old_termios)
 647 {
 648         struct mxser_port *info = tty->driver_data;
 649         unsigned cflag, cval, fcr;
 650         int ret = 0;
 651         unsigned char status;
 652
 653         cflag = tty->termios.c_cflag;
 654         if (!info->ioaddr)
 655                 return ret;
 656
 657         if (mxser_set_baud_method[tty->index] == 0)
 658                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 659
 660         /* byte size and parity */
 661         switch (cflag & CSIZE) {
 662         case CS5:
 663                 cval = 0x00;
 664                 break;
 665         case CS6:
 666                 cval = 0x01;
 667                 break;
 668         case CS7:
 669                 cval = 0x02;
 670                 break;
 671         case CS8:
 672                 cval = 0x03;
 673                 break;
 674         default:
 675                 cval = 0x00;
 676                 break;          /* too keep GCC shut... */
 677         }
 678         if (cflag & CSTOPB)
 679                 cval |= 0x04;
 680         if (cflag & PARENB)
 681                 cval |= UART_LCR_PARITY;
 682         if (!(cflag & PARODD))
 683                 cval |= UART_LCR_EPAR;
 684         if (cflag & CMSPAR)
 685                 cval |= UART_LCR_SPAR;
 686
 687         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 688                 if (info->board->chip_flag) {
 689                         fcr = UART_FCR_ENABLE_FIFO;
 690                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 691                         mxser_set_must_fifo_value(info);
 692                 } else
 693                         fcr = 0;
 694         } else {
 695                 fcr = UART_FCR_ENABLE_FIFO;
 696                 if (info->board->chip_flag) {
 697                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 698                         mxser_set_must_fifo_value(info);
 699                 } else {
 700                         switch (info->rx_trigger) {
 701                         case 1:
 702                                 fcr |= UART_FCR_TRIGGER_1;
 703                                 break;
 704                         case 4:
 705                                 fcr |= UART_FCR_TRIGGER_4;
 706                                 break;
 707                         case 8:
 708                                 fcr |= UART_FCR_TRIGGER_8;
 709                                 break;
 710                         default:
 711                                 fcr |= UART_FCR_TRIGGER_14;
 712                                 break;
 713                         }
 714                 }
 715         }
 716
 717         /* CTS flow control flag and modem status interrupts */
 718         info->IER &= ~UART_IER_MSI;
 719         info->MCR &= ~UART_MCR_AFE;
 720         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
 721         if (cflag & CRTSCTS) {
 722                 info->IER |= UART_IER_MSI;
 723                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 724                         info->MCR |= UART_MCR_AFE;
 725                 } else {
 726                         status = inb(info->ioaddr + UART_MSR);
 727                         if (tty->hw_stopped) {
 728                                 if (status & UART_MSR_CTS) {
 729                                         tty->hw_stopped = 0;
 730                                         if (info->type != PORT_16550A &&
 731                                                         !info->board->chip_flag) {
 732                                                 outb(info->IER & ~UART_IER_THRI,
 733                                                         info->ioaddr +
 734                                                         UART_IER);
 735                                                 info->IER |= UART_IER_THRI;
 736                                                 outb(info->IER, info->ioaddr +
 737                                                                 UART_IER);
 738                                         }
 739                                         tty_wakeup(tty);
 740                                 }
 741                         } else {
 742                                 if (!(status & UART_MSR_CTS)) {
 743                                         tty->hw_stopped = 1;
 744                                         if ((info->type != PORT_16550A) &&
 745                                                         (!info->board->chip_flag)) {
 746                                                 info->IER &= ~UART_IER_THRI;
 747                                                 outb(info->IER, info->ioaddr +
 748                                                                 UART_IER);
 749                                         }
 750                                 }
 751                         }
 752                 }
 753         }
 754         outb(info->MCR, info->ioaddr + UART_MCR);
 755         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
 756         if (~cflag & CLOCAL)
 757                 info->IER |= UART_IER_MSI;
 758         outb(info->IER, info->ioaddr + UART_IER);
 759
 760         /*
 761          * Set up parity check flag
 762          */
 763         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 764         if (I_INPCK(tty))
 765                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 766         if (I_BRKINT(tty) || I_PARMRK(tty))
 767                 info->read_status_mask |= UART_LSR_BI;
 768
 769         info->ignore_status_mask = 0;
 770
 771         if (I_IGNBRK(tty)) {
 772                 info->ignore_status_mask |= UART_LSR_BI;
 773                 info->read_status_mask |= UART_LSR_BI;
 774                 /*
 775                  * If we're ignore parity and break indicators, ignore
 776                  * overruns too.  (For real raw support).
 777                  */
 778                 if (I_IGNPAR(tty)) {
 779                         info->ignore_status_mask |=
 780                                                 UART_LSR_OE |
 781                                                 UART_LSR_PE |
 782                                                 UART_LSR_FE;
 783                         info->read_status_mask |=
 784                                                 UART_LSR_OE |
 785                                                 UART_LSR_PE |
 786                                                 UART_LSR_FE;
 787                 }
 788         }
 789         if (info->board->chip_flag) {
 790                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 791                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 792                 if (I_IXON(tty)) {
 793                         mxser_enable_must_rx_software_flow_control(
 794                                         info->ioaddr);
 795                 } else {
 796                         mxser_disable_must_rx_software_flow_control(
 797                                         info->ioaddr);
 798                 }
 799                 if (I_IXOFF(tty)) {
 800                         mxser_enable_must_tx_software_flow_control(
 801                                         info->ioaddr);
 802                 } else {
 803                         mxser_disable_must_tx_software_flow_control(
 804                                         info->ioaddr);
 805                 }
 806         }
 807
 808
 809         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 810         outb(cval, info->ioaddr + UART_LCR);
 811
 812         return ret;
 813 }
 814
 815 static void mxser_check_modem_status(struct tty_struct *tty,
 816                                 struct mxser_port *port, int status)
 817 {
 818         /* update input line counters */
 819         if (status & UART_MSR_TERI)
 820                 port->icount.rng++;
 821         if (status & UART_MSR_DDSR)
 822                 port->icount.dsr++;
 823         if (status & UART_MSR_DDCD)
 824                 port->icount.dcd++;
 825         if (status & UART_MSR_DCTS)
 826                 port->icount.cts++;
 827         port->mon_data.modem_status = status;
 828         wake_up_interruptible(&port->port.delta_msr_wait);
 829
 830         if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
 831                 if (status & UART_MSR_DCD)
 832                         wake_up_interruptible(&port->port.open_wait);
 833         }
 834
 835         if (tty_port_cts_enabled(&port->port)) {
 836                 if (tty->hw_stopped) {
 837                         if (status & UART_MSR_CTS) {
 838                                 tty->hw_stopped = 0;
 839
 840                                 if ((port->type != PORT_16550A) &&
 841                                                 (!port->board->chip_flag)) {
 842                                         outb(port->IER & ~UART_IER_THRI,
 843                                                 port->ioaddr + UART_IER);
 844                                         port->IER |= UART_IER_THRI;
 845                                         outb(port->IER, port->ioaddr +
 846                                                         UART_IER);
 847                                 }
 848                                 tty_wakeup(tty);
 849                         }
 850                 } else {
 851                         if (!(status & UART_MSR_CTS)) {
 852                                 tty->hw_stopped = 1;
 853                                 if (port->type != PORT_16550A &&
 854                                                 !port->board->chip_flag) {
 855                                         port->IER &= ~UART_IER_THRI;
 856                                         outb(port->IER, port->ioaddr +
 857                                                         UART_IER);
 858                                 }
 859                         }
 860                 }
 861         }
 862 }
 863
 864 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 865 {
 866         struct mxser_port *info = container_of(port, struct mxser_port, port);
 867         unsigned long page;
 868         unsigned long flags;
 869
 870         page = __get_free_page(GFP_KERNEL);
 871         if (!page)
 872                 return -ENOMEM;
 873
 874         spin_lock_irqsave(&info->slock, flags);
 875
 876         if (!info->ioaddr || !info->type) {
 877                 set_bit(TTY_IO_ERROR, &tty->flags);
 878                 free_page(page);
 879                 spin_unlock_irqrestore(&info->slock, flags);
 880                 return 0;
 881         }
 882         info->port.xmit_buf = (unsigned char *) page;
 883
 884         /*
 885          * Clear the FIFO buffers and disable them
 886          * (they will be reenabled in mxser_change_speed())
 887          */
 888         if (info->board->chip_flag)
 889                 outb((UART_FCR_CLEAR_RCVR |
 890                         UART_FCR_CLEAR_XMIT |
 891                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 892         else
 893                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 894                         info->ioaddr + UART_FCR);
 895
 896         /*
 897          * At this point there's no way the LSR could still be 0xFF;
 898          * if it is, then bail out, because there's likely no UART
 899          * here.
 900          */
 901         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 902                 spin_unlock_irqrestore(&info->slock, flags);
 903                 if (capable(CAP_SYS_ADMIN)) {
 904                         set_bit(TTY_IO_ERROR, &tty->flags);
 905                         return 0;
 906                 } else
 907                         return -ENODEV;
 908         }
 909
 910         /*
 911          * Clear the interrupt registers.
 912          */
 913         (void) inb(info->ioaddr + UART_LSR);
 914         (void) inb(info->ioaddr + UART_RX);
 915         (void) inb(info->ioaddr + UART_IIR);
 916         (void) inb(info->ioaddr + UART_MSR);
 917
 918         /*
 919          * Now, initialize the UART
 920          */
 921         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 922         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 923         outb(info->MCR, info->ioaddr + UART_MCR);
 924
 925         /*
 926          * Finally, enable interrupts
 927          */
 928         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 929
 930         if (info->board->chip_flag)
 931                 info->IER |= MOXA_MUST_IER_EGDAI;
 932         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 933
 934         /*
 935          * And clear the interrupt registers again for luck.
 936          */
 937         (void) inb(info->ioaddr + UART_LSR);
 938         (void) inb(info->ioaddr + UART_RX);
 939         (void) inb(info->ioaddr + UART_IIR);
 940         (void) inb(info->ioaddr + UART_MSR);
 941
 942         clear_bit(TTY_IO_ERROR, &tty->flags);
 943         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 944
 945         /*
 946          * and set the speed of the serial port
 947          */
 948         mxser_change_speed(tty, NULL);
 949         spin_unlock_irqrestore(&info->slock, flags);
 950
 951         return 0;
 952 }
 953
 954 /*
 955  * This routine will shutdown a serial port
 956  */
 957 static void mxser_shutdown_port(struct tty_port *port)
 958 {
 959         struct mxser_port *info = container_of(port, struct mxser_port, port);
 960         unsigned long flags;
 961
 962         spin_lock_irqsave(&info->slock, flags);
 963
 964         /*
 965          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 966          * here so the queue might never be waken up
 967          */
 968         wake_up_interruptible(&info->port.delta_msr_wait);
 969
 970         /*
 971          * Free the xmit buffer, if necessary
 972          */
 973         if (info->port.xmit_buf) {
 974                 free_page((unsigned long) info->port.xmit_buf);
 975                 info->port.xmit_buf = NULL;
 976         }
 977
 978         info->IER = 0;
 979         outb(0x00, info->ioaddr + UART_IER);
 980
 981         /* clear Rx/Tx FIFO's */
 982         if (info->board->chip_flag)
 983                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 984                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 985                                 info->ioaddr + UART_FCR);
 986         else
 987                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 988                         info->ioaddr + UART_FCR);
 989
 990         /* read data port to reset things */
 991         (void) inb(info->ioaddr + UART_RX);
 992
 993
 994         if (info->board->chip_flag)
 995                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 996
 997         spin_unlock_irqrestore(&info->slock, flags);
 998 }
 999
1000 /*
1001  * This routine is called whenever a serial port is opened.  It
1002  * enables interrupts for a serial port, linking in its async structure into
1003  * the IRQ chain.   It also performs the serial-specific
1004  * initialization for the tty structure.
1005  */
1006 static int mxser_open(struct tty_struct *tty, struct file *filp)
1007 {
1008         struct mxser_port *info;
1009         int line;
1010
1011         line = tty->index;
1012         if (line == MXSER_PORTS)
1013                 return 0;
1014         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1015         if (!info->ioaddr)
1016                 return -ENODEV;
1017
1018         tty->driver_data = info;
1019         return tty_port_open(&info->port, tty, filp);
1020 }
1021
1022 static void mxser_flush_buffer(struct tty_struct *tty)
1023 {
1024         struct mxser_port *info = tty->driver_data;
1025         char fcr;
1026         unsigned long flags;
1027
1028
1029         spin_lock_irqsave(&info->slock, flags);
1030         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1031
1032         fcr = inb(info->ioaddr + UART_FCR);
1033         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1034                 info->ioaddr + UART_FCR);
1035         outb(fcr, info->ioaddr + UART_FCR);
1036
1037         spin_unlock_irqrestore(&info->slock, flags);
1038
1039         tty_wakeup(tty);
1040 }
1041
1042
1043 static void mxser_close_port(struct tty_port *port)
1044 {
1045         struct mxser_port *info = container_of(port, struct mxser_port, port);
1046         unsigned long timeout;
1047         /*
1048          * At this point we stop accepting input.  To do this, we
1049          * disable the receive line status interrupts, and tell the
1050          * interrupt driver to stop checking the data ready bit in the
1051          * line status register.
1052          */
1053         info->IER &= ~UART_IER_RLSI;
1054         if (info->board->chip_flag)
1055                 info->IER &= ~MOXA_MUST_RECV_ISR;
1056
1057         outb(info->IER, info->ioaddr + UART_IER);
1058         /*
1059          * Before we drop DTR, make sure the UART transmitter
1060          * has completely drained; this is especially
1061          * important if there is a transmit FIFO!
1062          */
1063         timeout = jiffies + HZ;
1064         while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1065                 schedule_timeout_interruptible(5);
1066                 if (time_after(jiffies, timeout))
1067                         break;
1068         }
1069 }
1070
1071 /*
1072  * This routine is called when the serial port gets closed.  First, we
1073  * wait for the last remaining data to be sent.  Then, we unlink its
1074  * async structure from the interrupt chain if necessary, and we free
1075  * that IRQ if nothing is left in the chain.
1076  */
1077 static void mxser_close(struct tty_struct *tty, struct file *filp)
1078 {
1079         struct mxser_port *info = tty->driver_data;
1080         struct tty_port *port = &info->port;
1081
1082         if (tty->index == MXSER_PORTS || info == NULL)
1083                 return;
1084         if (tty_port_close_start(port, tty, filp) == 0)
1085                 return;
1086         info->closing = 1;
1087         mutex_lock(&port->mutex);
1088         mxser_close_port(port);
1089         mxser_flush_buffer(tty);
1090         if (tty_port_initialized(port) && C_HUPCL(tty))
1091                 tty_port_lower_dtr_rts(port);
1092         mxser_shutdown_port(port);
1093         tty_port_set_initialized(port, 0);
1094         mutex_unlock(&port->mutex);
1095         info->closing = 0;
1096         /* Right now the tty_port set is done outside of the close_end helper
1097            as we don't yet have everyone using refcounts */
1098         tty_port_close_end(port, tty);
1099         tty_port_tty_set(port, NULL);
1100 }
1101
1102 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1103 {
1104         int c, total = 0;
1105         struct mxser_port *info = tty->driver_data;
1106         unsigned long flags;
1107
1108         if (!info->port.xmit_buf)
1109                 return 0;
1110
1111         while (1) {
1112                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1113                                           SERIAL_XMIT_SIZE - info->xmit_head));
1114                 if (c <= 0)
1115                         break;
1116
1117                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1118                 spin_lock_irqsave(&info->slock, flags);
1119                 info->xmit_head = (info->xmit_head + c) &
1120                                   (SERIAL_XMIT_SIZE - 1);
1121                 info->xmit_cnt += c;
1122                 spin_unlock_irqrestore(&info->slock, flags);
1123
1124                 buf += c;
1125                 count -= c;
1126                 total += c;
1127         }
1128
1129         if (info->xmit_cnt && !tty->stopped) {
1130                 if (!tty->hw_stopped ||
1131                                 (info->type == PORT_16550A) ||
1132                                 (info->board->chip_flag)) {
1133                         spin_lock_irqsave(&info->slock, flags);
1134                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1135                                         UART_IER);
1136                         info->IER |= UART_IER_THRI;
1137                         outb(info->IER, info->ioaddr + UART_IER);
1138                         spin_unlock_irqrestore(&info->slock, flags);
1139                 }
1140         }
1141         return total;
1142 }
1143
1144 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1145 {
1146         struct mxser_port *info = tty->driver_data;
1147         unsigned long flags;
1148
1149         if (!info->port.xmit_buf)
1150                 return 0;
1151
1152         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1153                 return 0;
1154
1155         spin_lock_irqsave(&info->slock, flags);
1156         info->port.xmit_buf[info->xmit_head++] = ch;
1157         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1158         info->xmit_cnt++;
1159         spin_unlock_irqrestore(&info->slock, flags);
1160         if (!tty->stopped) {
1161                 if (!tty->hw_stopped ||
1162                                 (info->type == PORT_16550A) ||
1163                                 info->board->chip_flag) {
1164                         spin_lock_irqsave(&info->slock, flags);
1165                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1166                         info->IER |= UART_IER_THRI;
1167                         outb(info->IER, info->ioaddr + UART_IER);
1168                         spin_unlock_irqrestore(&info->slock, flags);
1169                 }
1170         }
1171         return 1;
1172 }
1173
1174
1175 static void mxser_flush_chars(struct tty_struct *tty)
1176 {
1177         struct mxser_port *info = tty->driver_data;
1178         unsigned long flags;
1179
1180         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1181                         (tty->hw_stopped && info->type != PORT_16550A &&
1182                          !info->board->chip_flag))
1183                 return;
1184
1185         spin_lock_irqsave(&info->slock, flags);
1186
1187         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1188         info->IER |= UART_IER_THRI;
1189         outb(info->IER, info->ioaddr + UART_IER);
1190
1191         spin_unlock_irqrestore(&info->slock, flags);
1192 }
1193
1194 static int mxser_write_room(struct tty_struct *tty)
1195 {
1196         struct mxser_port *info = tty->driver_data;
1197         int ret;
1198
1199         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1200         return ret < 0 ? 0 : ret;
1201 }
1202
1203 static int mxser_chars_in_buffer(struct tty_struct *tty)
1204 {
1205         struct mxser_port *info = tty->driver_data;
1206         return info->xmit_cnt;
1207 }
1208
1209 /*
1210  * ------------------------------------------------------------
1211  * friends of mxser_ioctl()
1212  * ------------------------------------------------------------
1213  */
1214 static int mxser_get_serial_info(struct tty_struct *tty,
1215                 struct serial_struct __user *retinfo)
1216 {
1217         struct mxser_port *info = tty->driver_data;
1218         struct serial_struct tmp = {
1219                 .type = info->type,
1220                 .line = tty->index,
1221                 .port = info->ioaddr,
1222                 .irq = info->board->irq,
1223                 .flags = info->port.flags,
1224                 .baud_base = info->baud_base,
1225                 .close_delay = info->port.close_delay,
1226                 .closing_wait = info->port.closing_wait,
1227                 .custom_divisor = info->custom_divisor,
1228         };
1229         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1230                 return -EFAULT;
1231         return 0;
1232 }
1233
1234 static int mxser_set_serial_info(struct tty_struct *tty,
1235                 struct serial_struct __user *new_info)
1236 {
1237         struct mxser_port *info = tty->driver_data;
1238         struct tty_port *port = &info->port;
1239         struct serial_struct new_serial;
1240         speed_t baud;
1241         unsigned long sl_flags;
1242         unsigned int flags;
1243         int retval = 0;
1244
1245         if (!new_info || !info->ioaddr)
1246                 return -ENODEV;
1247         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1248                 return -EFAULT;
1249
1250         if (new_serial.irq != info->board->irq ||
1251                         new_serial.port != info->ioaddr)
1252                 return -EINVAL;
1253
1254         flags = port->flags & ASYNC_SPD_MASK;
1255
1256         if (!capable(CAP_SYS_ADMIN)) {
1257                 if ((new_serial.baud_base != info->baud_base) ||
1258                                 (new_serial.close_delay != info->port.close_delay) ||
1259                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1260                         return -EPERM;
1261                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1262                                 (new_serial.flags & ASYNC_USR_MASK));
1263         } else {
1264                 /*
1265                  * OK, past this point, all the error checking has been done.
1266                  * At this point, we start making changes.....
1267                  */
1268                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1269                                 (new_serial.flags & ASYNC_FLAGS));
1270                 port->close_delay = new_serial.close_delay * HZ / 100;
1271                 port->closing_wait = new_serial.closing_wait * HZ / 100;
1272                 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1273                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1274                                 (new_serial.baud_base != info->baud_base ||
1275                                 new_serial.custom_divisor !=
1276                                 info->custom_divisor)) {
1277                         if (new_serial.custom_divisor == 0)
1278                                 return -EINVAL;
1279                         baud = new_serial.baud_base / new_serial.custom_divisor;
1280                         tty_encode_baud_rate(tty, baud, baud);
1281                 }
1282         }
1283
1284         info->type = new_serial.type;
1285
1286         process_txrx_fifo(info);
1287
1288         if (tty_port_initialized(port)) {
1289                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1290                         spin_lock_irqsave(&info->slock, sl_flags);
1291                         mxser_change_speed(tty, NULL);
1292                         spin_unlock_irqrestore(&info->slock, sl_flags);
1293                 }
1294         } else {
1295                 retval = mxser_activate(port, tty);
1296                 if (retval == 0)
1297                         tty_port_set_initialized(port, 1);
1298         }
1299         return retval;
1300 }
1301
1302 /*
1303  * mxser_get_lsr_info - get line status register info
1304  *
1305  * Purpose: Let user call ioctl() to get info when the UART physically
1306  *          is emptied.  On bus types like RS485, the transmitter must
1307  *          release the bus after transmitting. This must be done when
1308  *          the transmit shift register is empty, not be done when the
1309  *          transmit holding register is empty.  This functionality
1310  *          allows an RS485 driver to be written in user space.
1311  */
1312 static int mxser_get_lsr_info(struct mxser_port *info,
1313                 unsigned int __user *value)
1314 {
1315         unsigned char status;
1316         unsigned int result;
1317         unsigned long flags;
1318
1319         spin_lock_irqsave(&info->slock, flags);
1320         status = inb(info->ioaddr + UART_LSR);
1321         spin_unlock_irqrestore(&info->slock, flags);
1322         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1323         return put_user(result, value);
1324 }
1325
1326 static int mxser_tiocmget(struct tty_struct *tty)
1327 {
1328         struct mxser_port *info = tty->driver_data;
1329         unsigned char control, status;
1330         unsigned long flags;
1331
1332
1333         if (tty->index == MXSER_PORTS)
1334                 return -ENOIOCTLCMD;
1335         if (tty_io_error(tty))
1336                 return -EIO;
1337
1338         control = info->MCR;
1339
1340         spin_lock_irqsave(&info->slock, flags);
1341         status = inb(info->ioaddr + UART_MSR);
1342         if (status & UART_MSR_ANY_DELTA)
1343                 mxser_check_modem_status(tty, info, status);
1344         spin_unlock_irqrestore(&info->slock, flags);
1345         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1346                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1347                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1348                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1349                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1350                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1351 }
1352
1353 static int mxser_tiocmset(struct tty_struct *tty,
1354                 unsigned int set, unsigned int clear)
1355 {
1356         struct mxser_port *info = tty->driver_data;
1357         unsigned long flags;
1358
1359
1360         if (tty->index == MXSER_PORTS)
1361                 return -ENOIOCTLCMD;
1362         if (tty_io_error(tty))
1363                 return -EIO;
1364
1365         spin_lock_irqsave(&info->slock, flags);
1366
1367         if (set & TIOCM_RTS)
1368                 info->MCR |= UART_MCR_RTS;
1369         if (set & TIOCM_DTR)
1370                 info->MCR |= UART_MCR_DTR;
1371
1372         if (clear & TIOCM_RTS)
1373                 info->MCR &= ~UART_MCR_RTS;
1374         if (clear & TIOCM_DTR)
1375                 info->MCR &= ~UART_MCR_DTR;
1376
1377         outb(info->MCR, info->ioaddr + UART_MCR);
1378         spin_unlock_irqrestore(&info->slock, flags);
1379         return 0;
1380 }
1381
1382 static int __init mxser_program_mode(int port)
1383 {
1384         int id, i, j, n;
1385
1386         outb(0, port);
1387         outb(0, port);
1388         outb(0, port);
1389         (void)inb(port);
1390         (void)inb(port);
1391         outb(0, port);
1392         (void)inb(port);
1393
1394         id = inb(port + 1) & 0x1F;
1395         if ((id != C168_ASIC_ID) &&
1396                         (id != C104_ASIC_ID) &&
1397                         (id != C102_ASIC_ID) &&
1398                         (id != CI132_ASIC_ID) &&
1399                         (id != CI134_ASIC_ID) &&
1400                         (id != CI104J_ASIC_ID))
1401                 return -1;
1402         for (i = 0, j = 0; i < 4; i++) {
1403                 n = inb(port + 2);
1404                 if (n == 'M') {
1405                         j = 1;
1406                 } else if ((j == 1) && (n == 1)) {
1407                         j = 2;
1408                         break;
1409                 } else
1410                         j = 0;
1411         }
1412         if (j != 2)
1413                 id = -2;
1414         return id;
1415 }
1416
1417 static void __init mxser_normal_mode(int port)
1418 {
1419         int i, n;
1420
1421         outb(0xA5, port + 1);
1422         outb(0x80, port + 3);
1423         outb(12, port + 0);     /* 9600 bps */
1424         outb(0, port + 1);
1425         outb(0x03, port + 3);   /* 8 data bits */
1426         outb(0x13, port + 4);   /* loop back mode */
1427         for (i = 0; i < 16; i++) {
1428                 n = inb(port + 5);
1429                 if ((n & 0x61) == 0x60)
1430                         break;
1431                 if ((n & 1) == 1)
1432                         (void)inb(port);
1433         }
1434         outb(0x00, port + 4);
1435 }
1436
1437 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1438 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1439 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1440 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1441 #define EN_CCMD         0x000   /* Chip's command register     */
1442 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1443 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1444 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1445 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1446 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1447 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1448 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1449 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1450 static int __init mxser_read_register(int port, unsigned short *regs)
1451 {
1452         int i, k, value, id;
1453         unsigned int j;
1454
1455         id = mxser_program_mode(port);
1456         if (id < 0)
1457                 return id;
1458         for (i = 0; i < 14; i++) {
1459                 k = (i & 0x3F) | 0x180;
1460                 for (j = 0x100; j > 0; j >>= 1) {
1461                         outb(CHIP_CS, port);
1462                         if (k & j) {
1463                                 outb(CHIP_CS | CHIP_DO, port);
1464                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1465                         } else {
1466                                 outb(CHIP_CS, port);
1467                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1468                         }
1469                 }
1470                 (void)inb(port);
1471                 value = 0;
1472                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1473                         outb(CHIP_CS, port);
1474                         outb(CHIP_CS | CHIP_SK, port);
1475                         if (inb(port) & CHIP_DI)
1476                                 value |= j;
1477                 }
1478                 regs[i] = value;
1479                 outb(0, port);
1480         }
1481         mxser_normal_mode(port);
1482         return id;
1483 }
1484
1485 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1486 {
1487         struct mxser_port *ip;
1488         struct tty_port *port;
1489         struct tty_struct *tty;
1490         int result, status;
1491         unsigned int i, j;
1492         int ret = 0;
1493
1494         switch (cmd) {
1495         case MOXA_GET_MAJOR:
1496                 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1497                                         "%x (GET_MAJOR), fix your userspace\n",
1498                                         current->comm, cmd);
1499                 return put_user(ttymajor, (int __user *)argp);
1500
1501         case MOXA_CHKPORTENABLE:
1502                 result = 0;
1503                 for (i = 0; i < MXSER_BOARDS; i++)
1504                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1505                                 if (mxser_boards[i].ports[j].ioaddr)
1506                                         result |= (1 << i);
1507                 return put_user(result, (unsigned long __user *)argp);
1508         case MOXA_GETDATACOUNT:
1509                 /* The receive side is locked by port->slock but it isn't
1510                    clear that an exact snapshot is worth copying here */
1511                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1512                         ret = -EFAULT;
1513                 return ret;
1514         case MOXA_GETMSTATUS: {
1515                 struct mxser_mstatus ms, __user *msu = argp;
1516                 for (i = 0; i < MXSER_BOARDS; i++)
1517                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1518                                 ip = &mxser_boards[i].ports[j];
1519                                 port = &ip->port;
1520                                 memset(&ms, 0, sizeof(ms));
1521
1522                                 mutex_lock(&port->mutex);
1523                                 if (!ip->ioaddr)
1524                                         goto copy;
1525
1526                                 tty = tty_port_tty_get(port);
1527
1528                                 if (!tty)
1529                                         ms.cflag = ip->normal_termios.c_cflag;
1530                                 else
1531                                         ms.cflag = tty->termios.c_cflag;
1532                                 tty_kref_put(tty);
1533                                 spin_lock_irq(&ip->slock);
1534                                 status = inb(ip->ioaddr + UART_MSR);
1535                                 spin_unlock_irq(&ip->slock);
1536                                 if (status & UART_MSR_DCD)
1537                                         ms.dcd = 1;
1538                                 if (status & UART_MSR_DSR)
1539                                         ms.dsr = 1;
1540                                 if (status & UART_MSR_CTS)
1541                                         ms.cts = 1;
1542                         copy:
1543                                 mutex_unlock(&port->mutex);
1544                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1545                                         return -EFAULT;
1546                                 msu++;
1547                         }
1548                 return 0;
1549         }
1550         case MOXA_ASPP_MON_EXT: {
1551                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1552                 unsigned int cflag, iflag, p;
1553                 u8 opmode;
1554
1555                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1556                 if (!me)
1557                         return -ENOMEM;
1558
1559                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1560                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1561                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1562                                         i = MXSER_BOARDS;
1563                                         break;
1564                                 }
1565                                 ip = &mxser_boards[i].ports[j];
1566                                 port = &ip->port;
1567
1568                                 mutex_lock(&port->mutex);
1569                                 if (!ip->ioaddr) {
1570                                         mutex_unlock(&port->mutex);
1571                                         continue;
1572                                 }
1573
1574                                 spin_lock_irq(&ip->slock);
1575                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1576
1577                                 if (status & UART_MSR_TERI)
1578                                         ip->icount.rng++;
1579                                 if (status & UART_MSR_DDSR)
1580                                         ip->icount.dsr++;
1581                                 if (status & UART_MSR_DDCD)
1582                                         ip->icount.dcd++;
1583                                 if (status & UART_MSR_DCTS)
1584                                         ip->icount.cts++;
1585
1586                                 ip->mon_data.modem_status = status;
1587                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1588                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1589                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1590                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1591                                 me->modem_status[p] =
1592                                         ip->mon_data.modem_status;
1593                                 spin_unlock_irq(&ip->slock);
1594
1595                                 tty = tty_port_tty_get(&ip->port);
1596
1597                                 if (!tty) {
1598                                         cflag = ip->normal_termios.c_cflag;
1599                                         iflag = ip->normal_termios.c_iflag;
1600                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1601                                 } else {
1602                                         cflag = tty->termios.c_cflag;
1603                                         iflag = tty->termios.c_iflag;
1604                                         me->baudrate[p] = tty_get_baud_rate(tty);
1605                                 }
1606                                 tty_kref_put(tty);
1607
1608                                 me->databits[p] = cflag & CSIZE;
1609                                 me->stopbits[p] = cflag & CSTOPB;
1610                                 me->parity[p] = cflag & (PARENB | PARODD |
1611                                                 CMSPAR);
1612
1613                                 if (cflag & CRTSCTS)
1614                                         me->flowctrl[p] |= 0x03;
1615
1616                                 if (iflag & (IXON | IXOFF))
1617                                         me->flowctrl[p] |= 0x0C;
1618
1619                                 if (ip->type == PORT_16550A)
1620                                         me->fifo[p] = 1;
1621
1622                                 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1623                                         opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1624                                         opmode &= OP_MODE_MASK;
1625                                 } else {
1626                                         opmode = RS232_MODE;
1627                                 }
1628                                 me->iftype[p] = opmode;
1629                                 mutex_unlock(&port->mutex);
1630                         }
1631                 }
1632                 if (copy_to_user(argp, me, sizeof(*me)))
1633                         ret = -EFAULT;
1634                 kfree(me);
1635                 return ret;
1636         }
1637         default:
1638                 return -ENOIOCTLCMD;
1639         }
1640         return 0;
1641 }
1642
1643 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1644                 struct async_icount *cprev)
1645 {
1646         struct async_icount cnow;
1647         unsigned long flags;
1648         int ret;
1649
1650         spin_lock_irqsave(&info->slock, flags);
1651         cnow = info->icount;    /* atomic copy */
1652         spin_unlock_irqrestore(&info->slock, flags);
1653
1654         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1655                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1656                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1657                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1658
1659         *cprev = cnow;
1660
1661         return ret;
1662 }
1663
1664 static int mxser_ioctl(struct tty_struct *tty,
1665                 unsigned int cmd, unsigned long arg)
1666 {
1667         struct mxser_port *info = tty->driver_data;
1668         struct tty_port *port = &info->port;
1669         struct async_icount cnow;
1670         unsigned long flags;
1671         void __user *argp = (void __user *)arg;
1672         int retval;
1673
1674         if (tty->index == MXSER_PORTS)
1675                 return mxser_ioctl_special(cmd, argp);
1676
1677         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1678                 int p;
1679                 unsigned long opmode;
1680                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1681                 int shiftbit;
1682                 unsigned char val, mask;
1683
1684                 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1685                         return -EFAULT;
1686
1687                 p = tty->index % 4;
1688                 if (cmd == MOXA_SET_OP_MODE) {
1689                         if (get_user(opmode, (int __user *) argp))
1690                                 return -EFAULT;
1691                         if (opmode != RS232_MODE &&
1692                                         opmode != RS485_2WIRE_MODE &&
1693                                         opmode != RS422_MODE &&
1694                                         opmode != RS485_4WIRE_MODE)
1695                                 return -EFAULT;
1696                         mask = ModeMask[p];
1697                         shiftbit = p * 2;
1698                         spin_lock_irq(&info->slock);
1699                         val = inb(info->opmode_ioaddr);
1700                         val &= mask;
1701                         val |= (opmode << shiftbit);
1702                         outb(val, info->opmode_ioaddr);
1703                         spin_unlock_irq(&info->slock);
1704                 } else {
1705                         shiftbit = p * 2;
1706                         spin_lock_irq(&info->slock);
1707                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1708                         spin_unlock_irq(&info->slock);
1709                         opmode &= OP_MODE_MASK;
1710                         if (put_user(opmode, (int __user *)argp))
1711                                 return -EFAULT;
1712                 }
1713                 return 0;
1714         }
1715
1716         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && tty_io_error(tty))
1717                 return -EIO;
1718
1719         switch (cmd) {
1720         case TIOCGSERIAL:
1721                 mutex_lock(&port->mutex);
1722                 retval = mxser_get_serial_info(tty, argp);
1723                 mutex_unlock(&port->mutex);
1724                 return retval;
1725         case TIOCSSERIAL:
1726                 mutex_lock(&port->mutex);
1727                 retval = mxser_set_serial_info(tty, argp);
1728                 mutex_unlock(&port->mutex);
1729                 return retval;
1730         case TIOCSERGETLSR:     /* Get line status register */
1731                 return  mxser_get_lsr_info(info, argp);
1732                 /*
1733                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1734                  * - mask passed in arg for lines of interest
1735                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1736                  * Caller should use TIOCGICOUNT to see which one it was
1737                  */
1738         case TIOCMIWAIT:
1739                 spin_lock_irqsave(&info->slock, flags);
1740                 cnow = info->icount;    /* note the counters on entry */
1741                 spin_unlock_irqrestore(&info->slock, flags);
1742
1743                 return wait_event_interruptible(info->port.delta_msr_wait,
1744                                 mxser_cflags_changed(info, arg, &cnow));
1745         case MOXA_HighSpeedOn:
1746                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1747         case MOXA_SDS_RSTICOUNTER:
1748                 spin_lock_irq(&info->slock);
1749                 info->mon_data.rxcnt = 0;
1750                 info->mon_data.txcnt = 0;
1751                 spin_unlock_irq(&info->slock);
1752                 return 0;
1753
1754         case MOXA_ASPP_OQUEUE:{
1755                 int len, lsr;
1756
1757                 len = mxser_chars_in_buffer(tty);
1758                 spin_lock_irq(&info->slock);
1759                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1760                 spin_unlock_irq(&info->slock);
1761                 len += (lsr ? 0 : 1);
1762
1763                 return put_user(len, (int __user *)argp);
1764         }
1765         case MOXA_ASPP_MON: {
1766                 int mcr, status;
1767
1768                 spin_lock_irq(&info->slock);
1769                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1770                 mxser_check_modem_status(tty, info, status);
1771
1772                 mcr = inb(info->ioaddr + UART_MCR);
1773                 spin_unlock_irq(&info->slock);
1774
1775                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1776                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1777                 else
1778                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1779
1780                 if (mcr & MOXA_MUST_MCR_TX_XON)
1781                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1782                 else
1783                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1784
1785                 if (tty->hw_stopped)
1786                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1787                 else
1788                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1789
1790                 if (copy_to_user(argp, &info->mon_data,
1791                                 sizeof(struct mxser_mon)))
1792                         return -EFAULT;
1793
1794                 return 0;
1795         }
1796         case MOXA_ASPP_LSTATUS: {
1797                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1798                         return -EFAULT;
1799
1800                 info->err_shadow = 0;
1801                 return 0;
1802         }
1803         case MOXA_SET_BAUD_METHOD: {
1804                 int method;
1805
1806                 if (get_user(method, (int __user *)argp))
1807                         return -EFAULT;
1808                 mxser_set_baud_method[tty->index] = method;
1809                 return put_user(method, (int __user *)argp);
1810         }
1811         default:
1812                 return -ENOIOCTLCMD;
1813         }
1814         return 0;
1815 }
1816
1817         /*
1818          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1819          * Return: write counters to the user passed counter struct
1820          * NB: both 1->0 and 0->1 transitions are counted except for
1821          *     RI where only 0->1 is counted.
1822          */
1823
1824 static int mxser_get_icount(struct tty_struct *tty,
1825                 struct serial_icounter_struct *icount)
1826
1827 {
1828         struct mxser_port *info = tty->driver_data;
1829         struct async_icount cnow;
1830         unsigned long flags;
1831
1832         spin_lock_irqsave(&info->slock, flags);
1833         cnow = info->icount;
1834         spin_unlock_irqrestore(&info->slock, flags);
1835
1836         icount->frame = cnow.frame;
1837         icount->brk = cnow.brk;
1838         icount->overrun = cnow.overrun;
1839         icount->buf_overrun = cnow.buf_overrun;
1840         icount->parity = cnow.parity;
1841         icount->rx = cnow.rx;
1842         icount->tx = cnow.tx;
1843         icount->cts = cnow.cts;
1844         icount->dsr = cnow.dsr;
1845         icount->rng = cnow.rng;
1846         icount->dcd = cnow.dcd;
1847         return 0;
1848 }
1849
1850 static void mxser_stoprx(struct tty_struct *tty)
1851 {
1852         struct mxser_port *info = tty->driver_data;
1853
1854         info->ldisc_stop_rx = 1;
1855         if (I_IXOFF(tty)) {
1856                 if (info->board->chip_flag) {
1857                         info->IER &= ~MOXA_MUST_RECV_ISR;
1858                         outb(info->IER, info->ioaddr + UART_IER);
1859                 } else {
1860                         info->x_char = STOP_CHAR(tty);
1861                         outb(0, info->ioaddr + UART_IER);
1862                         info->IER |= UART_IER_THRI;
1863                         outb(info->IER, info->ioaddr + UART_IER);
1864                 }
1865         }
1866
1867         if (C_CRTSCTS(tty)) {
1868                 info->MCR &= ~UART_MCR_RTS;
1869                 outb(info->MCR, info->ioaddr + UART_MCR);
1870         }
1871 }
1872
1873 /*
1874  * This routine is called by the upper-layer tty layer to signal that
1875  * incoming characters should be throttled.
1876  */
1877 static void mxser_throttle(struct tty_struct *tty)
1878 {
1879         mxser_stoprx(tty);
1880 }
1881
1882 static void mxser_unthrottle(struct tty_struct *tty)
1883 {
1884         struct mxser_port *info = tty->driver_data;
1885
1886         /* startrx */
1887         info->ldisc_stop_rx = 0;
1888         if (I_IXOFF(tty)) {
1889                 if (info->x_char)
1890                         info->x_char = 0;
1891                 else {
1892                         if (info->board->chip_flag) {
1893                                 info->IER |= MOXA_MUST_RECV_ISR;
1894                                 outb(info->IER, info->ioaddr + UART_IER);
1895                         } else {
1896                                 info->x_char = START_CHAR(tty);
1897                                 outb(0, info->ioaddr + UART_IER);
1898                                 info->IER |= UART_IER_THRI;
1899                                 outb(info->IER, info->ioaddr + UART_IER);
1900                         }
1901                 }
1902         }
1903
1904         if (C_CRTSCTS(tty)) {
1905                 info->MCR |= UART_MCR_RTS;
1906                 outb(info->MCR, info->ioaddr + UART_MCR);
1907         }
1908 }
1909
1910 /*
1911  * mxser_stop() and mxser_start()
1912  *
1913  * This routines are called before setting or resetting tty->stopped.
1914  * They enable or disable transmitter interrupts, as necessary.
1915  */
1916 static void mxser_stop(struct tty_struct *tty)
1917 {
1918         struct mxser_port *info = tty->driver_data;
1919         unsigned long flags;
1920
1921         spin_lock_irqsave(&info->slock, flags);
1922         if (info->IER & UART_IER_THRI) {
1923                 info->IER &= ~UART_IER_THRI;
1924                 outb(info->IER, info->ioaddr + UART_IER);
1925         }
1926         spin_unlock_irqrestore(&info->slock, flags);
1927 }
1928
1929 static void mxser_start(struct tty_struct *tty)
1930 {
1931         struct mxser_port *info = tty->driver_data;
1932         unsigned long flags;
1933
1934         spin_lock_irqsave(&info->slock, flags);
1935         if (info->xmit_cnt && info->port.xmit_buf) {
1936                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1937                 info->IER |= UART_IER_THRI;
1938                 outb(info->IER, info->ioaddr + UART_IER);
1939         }
1940         spin_unlock_irqrestore(&info->slock, flags);
1941 }
1942
1943 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1944 {
1945         struct mxser_port *info = tty->driver_data;
1946         unsigned long flags;
1947
1948         spin_lock_irqsave(&info->slock, flags);
1949         mxser_change_speed(tty, old_termios);
1950         spin_unlock_irqrestore(&info->slock, flags);
1951
1952         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1953                 tty->hw_stopped = 0;
1954                 mxser_start(tty);
1955         }
1956
1957         /* Handle sw stopped */
1958         if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1959                 tty->stopped = 0;
1960
1961                 if (info->board->chip_flag) {
1962                         spin_lock_irqsave(&info->slock, flags);
1963                         mxser_disable_must_rx_software_flow_control(
1964                                         info->ioaddr);
1965                         spin_unlock_irqrestore(&info->slock, flags);
1966                 }
1967
1968                 mxser_start(tty);
1969         }
1970 }
1971
1972 /*
1973  * mxser_wait_until_sent() --- wait until the transmitter is empty
1974  */
1975 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1976 {
1977         struct mxser_port *info = tty->driver_data;
1978         unsigned long orig_jiffies, char_time;
1979         unsigned long flags;
1980         int lsr;
1981
1982         if (info->type == PORT_UNKNOWN)
1983                 return;
1984
1985         if (info->xmit_fifo_size == 0)
1986                 return;         /* Just in case.... */
1987
1988         orig_jiffies = jiffies;
1989         /*
1990          * Set the check interval to be 1/5 of the estimated time to
1991          * send a single character, and make it at least 1.  The check
1992          * interval should also be less than the timeout.
1993          *
1994          * Note: we have to use pretty tight timings here to satisfy
1995          * the NIST-PCTS.
1996          */
1997         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1998         char_time = char_time / 5;
1999         if (char_time == 0)
2000                 char_time = 1;
2001         if (timeout && timeout < char_time)
2002                 char_time = timeout;
2003         /*
2004          * If the transmitter hasn't cleared in twice the approximate
2005          * amount of time to send the entire FIFO, it probably won't
2006          * ever clear.  This assumes the UART isn't doing flow
2007          * control, which is currently the case.  Hence, if it ever
2008          * takes longer than info->timeout, this is probably due to a
2009          * UART bug of some kind.  So, we clamp the timeout parameter at
2010          * 2*info->timeout.
2011          */
2012         if (!timeout || timeout > 2 * info->timeout)
2013                 timeout = 2 * info->timeout;
2014
2015         spin_lock_irqsave(&info->slock, flags);
2016         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2017                 spin_unlock_irqrestore(&info->slock, flags);
2018                 schedule_timeout_interruptible(char_time);
2019                 spin_lock_irqsave(&info->slock, flags);
2020                 if (signal_pending(current))
2021                         break;
2022                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2023                         break;
2024         }
2025         spin_unlock_irqrestore(&info->slock, flags);
2026         set_current_state(TASK_RUNNING);
2027 }
2028
2029 /*
2030  * This routine is called by tty_hangup() when a hangup is signaled.
2031  */
2032 static void mxser_hangup(struct tty_struct *tty)
2033 {
2034         struct mxser_port *info = tty->driver_data;
2035
2036         mxser_flush_buffer(tty);
2037         tty_port_hangup(&info->port);
2038 }
2039
2040 /*
2041  * mxser_rs_break() --- routine which turns the break handling on or off
2042  */
2043 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2044 {
2045         struct mxser_port *info = tty->driver_data;
2046         unsigned long flags;
2047
2048         spin_lock_irqsave(&info->slock, flags);
2049         if (break_state == -1)
2050                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2051                         info->ioaddr + UART_LCR);
2052         else
2053                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2054                         info->ioaddr + UART_LCR);
2055         spin_unlock_irqrestore(&info->slock, flags);
2056         return 0;
2057 }
2058
2059 static void mxser_receive_chars(struct tty_struct *tty,
2060                                 struct mxser_port *port, int *status)
2061 {
2062         unsigned char ch, gdl;
2063         int ignored = 0;
2064         int cnt = 0;
2065         int recv_room;
2066         int max = 256;
2067
2068         recv_room = tty->receive_room;
2069         if (recv_room == 0 && !port->ldisc_stop_rx)
2070                 mxser_stoprx(tty);
2071         if (port->board->chip_flag != MOXA_OTHER_UART) {
2072
2073                 if (*status & UART_LSR_SPECIAL)
2074                         goto intr_old;
2075                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2076                                 (*status & MOXA_MUST_LSR_RERR))
2077                         goto intr_old;
2078                 if (*status & MOXA_MUST_LSR_RERR)
2079                         goto intr_old;
2080
2081                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2082
2083                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2084                         gdl &= MOXA_MUST_GDL_MASK;
2085                 if (gdl >= recv_room) {
2086                         if (!port->ldisc_stop_rx)
2087                                 mxser_stoprx(tty);
2088                 }
2089                 while (gdl--) {
2090                         ch = inb(port->ioaddr + UART_RX);
2091                         tty_insert_flip_char(&port->port, ch, 0);
2092                         cnt++;
2093                 }
2094                 goto end_intr;
2095         }
2096 intr_old:
2097
2098         do {
2099                 if (max-- < 0)
2100                         break;
2101
2102                 ch = inb(port->ioaddr + UART_RX);
2103                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2104                         outb(0x23, port->ioaddr + UART_FCR);
2105                 *status &= port->read_status_mask;
2106                 if (*status & port->ignore_status_mask) {
2107                         if (++ignored > 100)
2108                                 break;
2109                 } else {
2110                         char flag = 0;
2111                         if (*status & UART_LSR_SPECIAL) {
2112                                 if (*status & UART_LSR_BI) {
2113                                         flag = TTY_BREAK;
2114                                         port->icount.brk++;
2115
2116                                         if (port->port.flags & ASYNC_SAK)
2117                                                 do_SAK(tty);
2118                                 } else if (*status & UART_LSR_PE) {
2119                                         flag = TTY_PARITY;
2120                                         port->icount.parity++;
2121                                 } else if (*status & UART_LSR_FE) {
2122                                         flag = TTY_FRAME;
2123                                         port->icount.frame++;
2124                                 } else if (*status & UART_LSR_OE) {
2125                                         flag = TTY_OVERRUN;
2126                                         port->icount.overrun++;
2127                                 } else
2128                                         flag = TTY_BREAK;
2129                         }
2130                         tty_insert_flip_char(&port->port, ch, flag);
2131                         cnt++;
2132                         if (cnt >= recv_room) {
2133                                 if (!port->ldisc_stop_rx)
2134                                         mxser_stoprx(tty);
2135                                 break;
2136                         }
2137
2138                 }
2139
2140                 if (port->board->chip_flag)
2141                         break;
2142
2143                 *status = inb(port->ioaddr + UART_LSR);
2144         } while (*status & UART_LSR_DR);
2145
2146 end_intr:
2147         mxvar_log.rxcnt[tty->index] += cnt;
2148         port->mon_data.rxcnt += cnt;
2149         port->mon_data.up_rxcnt += cnt;
2150
2151         /*
2152          * We are called from an interrupt context with &port->slock
2153          * being held. Drop it temporarily in order to prevent
2154          * recursive locking.
2155          */
2156         spin_unlock(&port->slock);
2157         tty_flip_buffer_push(&port->port);
2158         spin_lock(&port->slock);
2159 }
2160
2161 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2162 {
2163         int count, cnt;
2164
2165         if (port->x_char) {
2166                 outb(port->x_char, port->ioaddr + UART_TX);
2167                 port->x_char = 0;
2168                 mxvar_log.txcnt[tty->index]++;
2169                 port->mon_data.txcnt++;
2170                 port->mon_data.up_txcnt++;
2171                 port->icount.tx++;
2172                 return;
2173         }
2174
2175         if (port->port.xmit_buf == NULL)
2176                 return;
2177
2178         if (port->xmit_cnt <= 0 || tty->stopped ||
2179                         (tty->hw_stopped &&
2180                         (port->type != PORT_16550A) &&
2181                         (!port->board->chip_flag))) {
2182                 port->IER &= ~UART_IER_THRI;
2183                 outb(port->IER, port->ioaddr + UART_IER);
2184                 return;
2185         }
2186
2187         cnt = port->xmit_cnt;
2188         count = port->xmit_fifo_size;
2189         do {
2190                 outb(port->port.xmit_buf[port->xmit_tail++],
2191                         port->ioaddr + UART_TX);
2192                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2193                 if (--port->xmit_cnt <= 0)
2194                         break;
2195         } while (--count > 0);
2196         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2197
2198         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2199         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2200         port->icount.tx += (cnt - port->xmit_cnt);
2201
2202         if (port->xmit_cnt < WAKEUP_CHARS)
2203                 tty_wakeup(tty);
2204
2205         if (port->xmit_cnt <= 0) {
2206                 port->IER &= ~UART_IER_THRI;
2207                 outb(port->IER, port->ioaddr + UART_IER);
2208         }
2209 }
2210
2211 /*
2212  * This is the serial driver's generic interrupt routine
2213  */
2214 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2215 {
2216         int status, iir, i;
2217         struct mxser_board *brd = NULL;
2218         struct mxser_port *port;
2219         int max, irqbits, bits, msr;
2220         unsigned int int_cnt, pass_counter = 0;
2221         int handled = IRQ_NONE;
2222         struct tty_struct *tty;
2223
2224         for (i = 0; i < MXSER_BOARDS; i++)
2225                 if (dev_id == &mxser_boards[i]) {
2226                         brd = dev_id;
2227                         break;
2228                 }
2229
2230         if (i == MXSER_BOARDS)
2231                 goto irq_stop;
2232         if (brd == NULL)
2233                 goto irq_stop;
2234         max = brd->info->nports;
2235         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2236                 irqbits = inb(brd->vector) & brd->vector_mask;
2237                 if (irqbits == brd->vector_mask)
2238                         break;
2239
2240                 handled = IRQ_HANDLED;
2241                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2242                         if (irqbits == brd->vector_mask)
2243                                 break;
2244                         if (bits & irqbits)
2245                                 continue;
2246                         port = &brd->ports[i];
2247
2248                         int_cnt = 0;
2249                         spin_lock(&port->slock);
2250                         do {
2251                                 iir = inb(port->ioaddr + UART_IIR);
2252                                 if (iir & UART_IIR_NO_INT)
2253                                         break;
2254                                 iir &= MOXA_MUST_IIR_MASK;
2255                                 tty = tty_port_tty_get(&port->port);
2256                                 if (!tty || port->closing ||
2257                                     !tty_port_initialized(&port->port)) {
2258                                         status = inb(port->ioaddr + UART_LSR);
2259                                         outb(0x27, port->ioaddr + UART_FCR);
2260                                         inb(port->ioaddr + UART_MSR);
2261                                         tty_kref_put(tty);
2262                                         break;
2263                                 }
2264
2265                                 status = inb(port->ioaddr + UART_LSR);
2266
2267                                 if (status & UART_LSR_PE)
2268                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2269                                 if (status & UART_LSR_FE)
2270                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2271                                 if (status & UART_LSR_OE)
2272                                         port->err_shadow |=
2273                                                 NPPI_NOTIFY_HW_OVERRUN;
2274                                 if (status & UART_LSR_BI)
2275                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2276
2277                                 if (port->board->chip_flag) {
2278                                         if (iir == MOXA_MUST_IIR_GDA ||
2279                                             iir == MOXA_MUST_IIR_RDA ||
2280                                             iir == MOXA_MUST_IIR_RTO ||
2281                                             iir == MOXA_MUST_IIR_LSR)
2282                                                 mxser_receive_chars(tty, port,
2283                                                                 &status);
2284
2285                                 } else {
2286                                         status &= port->read_status_mask;
2287                                         if (status & UART_LSR_DR)
2288                                                 mxser_receive_chars(tty, port,
2289                                                                 &status);
2290                                 }
2291                                 msr = inb(port->ioaddr + UART_MSR);
2292                                 if (msr & UART_MSR_ANY_DELTA)
2293                                         mxser_check_modem_status(tty, port, msr);
2294
2295                                 if (port->board->chip_flag) {
2296                                         if (iir == 0x02 && (status &
2297                                                                 UART_LSR_THRE))
2298                                                 mxser_transmit_chars(tty, port);
2299                                 } else {
2300                                         if (status & UART_LSR_THRE)
2301                                                 mxser_transmit_chars(tty, port);
2302                                 }
2303                                 tty_kref_put(tty);
2304                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2305                         spin_unlock(&port->slock);
2306                 }
2307         }
2308
2309 irq_stop:
2310         return handled;
2311 }
2312
2313 static const struct tty_operations mxser_ops = {
2314         .open = mxser_open,
2315         .close = mxser_close,
2316         .write = mxser_write,
2317         .put_char = mxser_put_char,
2318         .flush_chars = mxser_flush_chars,
2319         .write_room = mxser_write_room,
2320         .chars_in_buffer = mxser_chars_in_buffer,
2321         .flush_buffer = mxser_flush_buffer,
2322         .ioctl = mxser_ioctl,
2323         .throttle = mxser_throttle,
2324         .unthrottle = mxser_unthrottle,
2325         .set_termios = mxser_set_termios,
2326         .stop = mxser_stop,
2327         .start = mxser_start,
2328         .hangup = mxser_hangup,
2329         .break_ctl = mxser_rs_break,
2330         .wait_until_sent = mxser_wait_until_sent,
2331         .tiocmget = mxser_tiocmget,
2332         .tiocmset = mxser_tiocmset,
2333         .get_icount = mxser_get_icount,
2334 };
2335
2336 static const struct tty_port_operations mxser_port_ops = {
2337         .carrier_raised = mxser_carrier_raised,
2338         .dtr_rts = mxser_dtr_rts,
2339         .activate = mxser_activate,
2340         .shutdown = mxser_shutdown_port,
2341 };
2342
2343 /*
2344  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2345  */
2346
2347 static bool allow_overlapping_vector;
2348 module_param(allow_overlapping_vector, bool, S_IRUGO);
2349 MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2350
2351 static bool mxser_overlapping_vector(struct mxser_board *brd)
2352 {
2353         return allow_overlapping_vector &&
2354                 brd->vector >= brd->ports[0].ioaddr &&
2355                 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2356 }
2357
2358 static int mxser_request_vector(struct mxser_board *brd)
2359 {
2360         if (mxser_overlapping_vector(brd))
2361                 return 0;
2362         return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2363 }
2364
2365 static void mxser_release_vector(struct mxser_board *brd)
2366 {
2367         if (mxser_overlapping_vector(brd))
2368                 return;
2369         release_region(brd->vector, 1);
2370 }
2371
2372 static void mxser_release_ISA_res(struct mxser_board *brd)
2373 {
2374         release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2375         mxser_release_vector(brd);
2376 }
2377
2378 static int mxser_initbrd(struct mxser_board *brd,
2379                 struct pci_dev *pdev)
2380 {
2381         struct mxser_port *info;
2382         unsigned int i;
2383         int retval;
2384
2385         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2386                         brd->ports[0].max_baud);
2387
2388         for (i = 0; i < brd->info->nports; i++) {
2389                 info = &brd->ports[i];
2390                 tty_port_init(&info->port);
2391                 info->port.ops = &mxser_port_ops;
2392                 info->board = brd;
2393                 info->stop_rx = 0;
2394                 info->ldisc_stop_rx = 0;
2395
2396                 /* Enhance mode enabled here */
2397                 if (brd->chip_flag != MOXA_OTHER_UART)
2398                         mxser_enable_must_enchance_mode(info->ioaddr);
2399
2400                 info->type = brd->uart_type;
2401
2402                 process_txrx_fifo(info);
2403
2404                 info->custom_divisor = info->baud_base * 16;
2405                 info->port.close_delay = 5 * HZ / 10;
2406                 info->port.closing_wait = 30 * HZ;
2407                 info->normal_termios = mxvar_sdriver->init_termios;
2408                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2409                 info->err_shadow = 0;
2410                 spin_lock_init(&info->slock);
2411
2412                 /* before set INT ISR, disable all int */
2413                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2414                         info->ioaddr + UART_IER);
2415         }
2416
2417         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2418                         brd);
2419         if (retval) {
2420                 for (i = 0; i < brd->info->nports; i++)
2421                         tty_port_destroy(&brd->ports[i].port);
2422                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2423                         "conflict with another device.\n",
2424                         brd->info->name, brd->irq);
2425         }
2426
2427         return retval;
2428 }
2429
2430 static void mxser_board_remove(struct mxser_board *brd)
2431 {
2432         unsigned int i;
2433
2434         for (i = 0; i < brd->info->nports; i++) {
2435                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2436                 tty_port_destroy(&brd->ports[i].port);
2437         }
2438         free_irq(brd->irq, brd);
2439 }
2440
2441 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2442 {
2443         int id, i, bits, ret;
2444         unsigned short regs[16], irq;
2445         unsigned char scratch, scratch2;
2446
2447         brd->chip_flag = MOXA_OTHER_UART;
2448
2449         id = mxser_read_register(cap, regs);
2450         switch (id) {
2451         case C168_ASIC_ID:
2452                 brd->info = &mxser_cards[0];
2453                 break;
2454         case C104_ASIC_ID:
2455                 brd->info = &mxser_cards[1];
2456                 break;
2457         case CI104J_ASIC_ID:
2458                 brd->info = &mxser_cards[2];
2459                 break;
2460         case C102_ASIC_ID:
2461                 brd->info = &mxser_cards[5];
2462                 break;
2463         case CI132_ASIC_ID:
2464                 brd->info = &mxser_cards[6];
2465                 break;
2466         case CI134_ASIC_ID:
2467                 brd->info = &mxser_cards[7];
2468                 break;
2469         default:
2470                 return 0;
2471         }
2472
2473         irq = 0;
2474         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2475            Flag-hack checks if configuration should be read as 2-port here. */
2476         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2477                 irq = regs[9] & 0xF000;
2478                 irq = irq | (irq >> 4);
2479                 if (irq != (regs[9] & 0xFF00))
2480                         goto err_irqconflict;
2481         } else if (brd->info->nports == 4) {
2482                 irq = regs[9] & 0xF000;
2483                 irq = irq | (irq >> 4);
2484                 irq = irq | (irq >> 8);
2485                 if (irq != regs[9])
2486                         goto err_irqconflict;
2487         } else if (brd->info->nports == 8) {
2488                 irq = regs[9] & 0xF000;
2489                 irq = irq | (irq >> 4);
2490                 irq = irq | (irq >> 8);
2491                 if ((irq != regs[9]) || (irq != regs[10]))
2492                         goto err_irqconflict;
2493         }
2494
2495         if (!irq) {
2496                 printk(KERN_ERR "mxser: interrupt number unset\n");
2497                 return -EIO;
2498         }
2499         brd->irq = ((int)(irq & 0xF000) >> 12);
2500         for (i = 0; i < 8; i++)
2501                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2502         if ((regs[12] & 0x80) == 0) {
2503                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2504                 return -EIO;
2505         }
2506         brd->vector = (int)regs[11];    /* interrupt vector */
2507         if (id == 1)
2508                 brd->vector_mask = 0x00FF;
2509         else
2510                 brd->vector_mask = 0x000F;
2511         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2512                 if (regs[12] & bits) {
2513                         brd->ports[i].baud_base = 921600;
2514                         brd->ports[i].max_baud = 921600;
2515                 } else {
2516                         brd->ports[i].baud_base = 115200;
2517                         brd->ports[i].max_baud = 115200;
2518                 }
2519         }
2520         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2521         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2522         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2523         outb(scratch2, cap + UART_LCR);
2524         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2525         scratch = inb(cap + UART_IIR);
2526
2527         if (scratch & 0xC0)
2528                 brd->uart_type = PORT_16550A;
2529         else
2530                 brd->uart_type = PORT_16450;
2531         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2532                         "mxser(IO)")) {
2533                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2534                                 "0x%.8lx-0x%.8lx\n",
2535                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2536                                 8 * brd->info->nports - 1);
2537                 return -EIO;
2538         }
2539
2540         ret = mxser_request_vector(brd);
2541         if (ret) {
2542                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2543                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2544                                 "0x%.8lx-0x%.8lx\n",
2545                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2546                                 8 * brd->info->nports - 1);
2547                 return ret;
2548         }
2549         return brd->info->nports;
2550
2551 err_irqconflict:
2552         printk(KERN_ERR "mxser: invalid interrupt number\n");
2553         return -EIO;
2554 }
2555
2556 static int mxser_probe(struct pci_dev *pdev,
2557                 const struct pci_device_id *ent)
2558 {
2559 #ifdef CONFIG_PCI
2560         struct mxser_board *brd;
2561         unsigned int i, j;
2562         unsigned long ioaddress;
2563         struct device *tty_dev;
2564         int retval = -EINVAL;
2565
2566         for (i = 0; i < MXSER_BOARDS; i++)
2567                 if (mxser_boards[i].info == NULL)
2568                         break;
2569
2570         if (i >= MXSER_BOARDS) {
2571                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2572                                 "not configured\n", MXSER_BOARDS);
2573                 goto err;
2574         }
2575
2576         brd = &mxser_boards[i];
2577         brd->idx = i * MXSER_PORTS_PER_BOARD;
2578         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2579                 mxser_cards[ent->driver_data].name,
2580                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2581
2582         retval = pci_enable_device(pdev);
2583         if (retval) {
2584                 dev_err(&pdev->dev, "PCI enable failed\n");
2585                 goto err;
2586         }
2587
2588         /* io address */
2589         ioaddress = pci_resource_start(pdev, 2);
2590         retval = pci_request_region(pdev, 2, "mxser(IO)");
2591         if (retval)
2592                 goto err_dis;
2593
2594         brd->info = &mxser_cards[ent->driver_data];
2595         for (i = 0; i < brd->info->nports; i++)
2596                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2597
2598         /* vector */
2599         ioaddress = pci_resource_start(pdev, 3);
2600         retval = pci_request_region(pdev, 3, "mxser(vector)");
2601         if (retval)
2602                 goto err_zero;
2603         brd->vector = ioaddress;
2604
2605         /* irq */
2606         brd->irq = pdev->irq;
2607
2608         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2609         brd->uart_type = PORT_16550A;
2610         brd->vector_mask = 0;
2611
2612         for (i = 0; i < brd->info->nports; i++) {
2613                 for (j = 0; j < UART_INFO_NUM; j++) {
2614                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2615                                 brd->ports[i].max_baud =
2616                                         Gpci_uart_info[j].max_baud;
2617
2618                                 /* exception....CP-102 */
2619                                 if (brd->info->flags & MXSER_HIGHBAUD)
2620                                         brd->ports[i].max_baud = 921600;
2621                                 break;
2622                         }
2623                 }
2624         }
2625
2626         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2627                 for (i = 0; i < brd->info->nports; i++) {
2628                         if (i < 4)
2629                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2630                         else
2631                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2632                 }
2633                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2634                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2635         }
2636
2637         for (i = 0; i < brd->info->nports; i++) {
2638                 brd->vector_mask |= (1 << i);
2639                 brd->ports[i].baud_base = 921600;
2640         }
2641
2642         /* mxser_initbrd will hook ISR. */
2643         retval = mxser_initbrd(brd, pdev);
2644         if (retval)
2645                 goto err_rel3;
2646
2647         for (i = 0; i < brd->info->nports; i++) {
2648                 tty_dev = tty_port_register_device(&brd->ports[i].port,
2649                                 mxvar_sdriver, brd->idx + i, &pdev->dev);
2650                 if (IS_ERR(tty_dev)) {
2651                         retval = PTR_ERR(tty_dev);
2652                         for (; i > 0; i--)
2653                                 tty_unregister_device(mxvar_sdriver,
2654                                         brd->idx + i - 1);
2655                         goto err_relbrd;
2656                 }
2657         }
2658
2659         pci_set_drvdata(pdev, brd);
2660
2661         return 0;
2662 err_relbrd:
2663         for (i = 0; i < brd->info->nports; i++)
2664                 tty_port_destroy(&brd->ports[i].port);
2665         free_irq(brd->irq, brd);
2666 err_rel3:
2667         pci_release_region(pdev, 3);
2668 err_zero:
2669         brd->info = NULL;
2670         pci_release_region(pdev, 2);
2671 err_dis:
2672         pci_disable_device(pdev);
2673 err:
2674         return retval;
2675 #else
2676         return -ENODEV;
2677 #endif
2678 }
2679
2680 static void mxser_remove(struct pci_dev *pdev)
2681 {
2682 #ifdef CONFIG_PCI
2683         struct mxser_board *brd = pci_get_drvdata(pdev);
2684
2685         mxser_board_remove(brd);
2686
2687         pci_release_region(pdev, 2);
2688         pci_release_region(pdev, 3);
2689         pci_disable_device(pdev);
2690         brd->info = NULL;
2691 #endif
2692 }
2693
2694 static struct pci_driver mxser_driver = {
2695         .name = "mxser",
2696         .id_table = mxser_pcibrds,
2697         .probe = mxser_probe,
2698         .remove = mxser_remove
2699 };
2700
2701 static int __init mxser_module_init(void)
2702 {
2703         struct mxser_board *brd;
2704         struct device *tty_dev;
2705         unsigned int b, i, m;
2706         int retval;
2707
2708         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2709         if (!mxvar_sdriver)
2710                 return -ENOMEM;
2711
2712         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2713                 MXSER_VERSION);
2714
2715         /* Initialize the tty_driver structure */
2716         mxvar_sdriver->name = "ttyMI";
2717         mxvar_sdriver->major = ttymajor;
2718         mxvar_sdriver->minor_start = 0;
2719         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2720         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2721         mxvar_sdriver->init_termios = tty_std_termios;
2722         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2723         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2724         tty_set_operations(mxvar_sdriver, &mxser_ops);
2725
2726         retval = tty_register_driver(mxvar_sdriver);
2727         if (retval) {
2728                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2729                                 "tty driver !\n");
2730                 goto err_put;
2731         }
2732
2733         /* Start finding ISA boards here */
2734         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2735                 if (!ioaddr[b])
2736                         continue;
2737
2738                 brd = &mxser_boards[m];
2739                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2740                 if (retval <= 0) {
2741                         brd->info = NULL;
2742                         continue;
2743                 }
2744
2745                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2746                                 brd->info->name, ioaddr[b]);
2747
2748                 /* mxser_initbrd will hook ISR. */
2749                 if (mxser_initbrd(brd, NULL) < 0) {
2750                         mxser_release_ISA_res(brd);
2751                         brd->info = NULL;
2752                         continue;
2753                 }
2754
2755                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2756                 for (i = 0; i < brd->info->nports; i++) {
2757                         tty_dev = tty_port_register_device(&brd->ports[i].port,
2758                                         mxvar_sdriver, brd->idx + i, NULL);
2759                         if (IS_ERR(tty_dev)) {
2760                                 for (; i > 0; i--)
2761                                         tty_unregister_device(mxvar_sdriver,
2762                                                 brd->idx + i - 1);
2763                                 for (i = 0; i < brd->info->nports; i++)
2764                                         tty_port_destroy(&brd->ports[i].port);
2765                                 free_irq(brd->irq, brd);
2766                                 mxser_release_ISA_res(brd);
2767                                 brd->info = NULL;
2768                                 break;
2769                         }
2770                 }
2771                 if (brd->info == NULL)
2772                         continue;
2773
2774                 m++;
2775         }
2776
2777         retval = pci_register_driver(&mxser_driver);
2778         if (retval) {
2779                 printk(KERN_ERR "mxser: can't register pci driver\n");
2780                 if (!m) {
2781                         retval = -ENODEV;
2782                         goto err_unr;
2783                 } /* else: we have some ISA cards under control */
2784         }
2785
2786         return 0;
2787 err_unr:
2788         tty_unregister_driver(mxvar_sdriver);
2789 err_put:
2790         put_tty_driver(mxvar_sdriver);
2791         return retval;
2792 }
2793
2794 static void __exit mxser_module_exit(void)
2795 {
2796         unsigned int i;
2797
2798         pci_unregister_driver(&mxser_driver);
2799
2800         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2801                 if (mxser_boards[i].info != NULL)
2802                         mxser_board_remove(&mxser_boards[i]);
2803         tty_unregister_driver(mxvar_sdriver);
2804         put_tty_driver(mxvar_sdriver);
2805
2806         for (i = 0; i < MXSER_BOARDS; i++)
2807                 if (mxser_boards[i].info != NULL)
2808                         mxser_release_ISA_res(&mxser_boards[i]);
2809 }
2810
2811 module_init(mxser_module_init);
2812 module_exit(mxser_module_exit);