drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
  18  *      www.moxa.com.
  19  *      - Fixed x86_64 cleanness
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/serial.h>
  31 #include <linux/serial_reg.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/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
  43 #include <asm/system.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.5"         /* 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 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_array(ioaddr, ulong, 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         int timeout;
 250
 251         int read_status_mask;
 252         int ignore_status_mask;
 253         int xmit_fifo_size;
 254         int xmit_head;
 255         int xmit_tail;
 256         int xmit_cnt;
 257
 258         struct ktermios normal_termios;
 259
 260         struct mxser_mon mon_data;
 261
 262         spinlock_t slock;
 263 };
 264
 265 struct mxser_board {
 266         unsigned int idx;
 267         int irq;
 268         const struct mxser_cardinfo *info;
 269         unsigned long vector;
 270         unsigned long vector_mask;
 271
 272         int chip_flag;
 273         int uart_type;
 274
 275         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 276 };
 277
 278 struct mxser_mstatus {
 279         tcflag_t cflag;
 280         int cts;
 281         int dsr;
 282         int ri;
 283         int dcd;
 284 };
 285
 286 static struct mxser_board mxser_boards[MXSER_BOARDS];
 287 static struct tty_driver *mxvar_sdriver;
 288 static struct mxser_log mxvar_log;
 289 static int mxser_set_baud_method[MXSER_PORTS + 1];
 290
 291 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 292 {
 293         u8 oldlcr;
 294         u8 efr;
 295
 296         oldlcr = inb(baseio + UART_LCR);
 297         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 298
 299         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 300         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 301
 302         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 303         outb(oldlcr, baseio + UART_LCR);
 304 }
 305
 306 #ifdef  CONFIG_PCI
 307 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 308 {
 309         u8 oldlcr;
 310         u8 efr;
 311
 312         oldlcr = inb(baseio + UART_LCR);
 313         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 314
 315         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 316         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 317
 318         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 319         outb(oldlcr, baseio + UART_LCR);
 320 }
 321 #endif
 322
 323 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 324 {
 325         u8 oldlcr;
 326         u8 efr;
 327
 328         oldlcr = inb(baseio + UART_LCR);
 329         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 330
 331         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 332         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 333         efr |= MOXA_MUST_EFR_BANK0;
 334
 335         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 336         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 337         outb(oldlcr, baseio + UART_LCR);
 338 }
 339
 340 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 341 {
 342         u8 oldlcr;
 343         u8 efr;
 344
 345         oldlcr = inb(baseio + UART_LCR);
 346         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 347
 348         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 349         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 350         efr |= MOXA_MUST_EFR_BANK0;
 351
 352         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 353         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 354         outb(oldlcr, baseio + UART_LCR);
 355 }
 356
 357 static void mxser_set_must_fifo_value(struct mxser_port *info)
 358 {
 359         u8 oldlcr;
 360         u8 efr;
 361
 362         oldlcr = inb(info->ioaddr + UART_LCR);
 363         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 364
 365         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 366         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 367         efr |= MOXA_MUST_EFR_BANK1;
 368
 369         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 370         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 371         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 372         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 373         outb(oldlcr, info->ioaddr + UART_LCR);
 374 }
 375
 376 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 377 {
 378         u8 oldlcr;
 379         u8 efr;
 380
 381         oldlcr = inb(baseio + UART_LCR);
 382         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 383
 384         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 385         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 386         efr |= MOXA_MUST_EFR_BANK2;
 387
 388         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 389         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 390         outb(oldlcr, baseio + UART_LCR);
 391 }
 392
 393 #ifdef CONFIG_PCI
 394 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 395 {
 396         u8 oldlcr;
 397         u8 efr;
 398
 399         oldlcr = inb(baseio + UART_LCR);
 400         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 401
 402         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 403         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 404         efr |= MOXA_MUST_EFR_BANK2;
 405
 406         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 407         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 408         outb(oldlcr, baseio + UART_LCR);
 409 }
 410 #endif
 411
 412 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 413 {
 414         u8 oldlcr;
 415         u8 efr;
 416
 417         oldlcr = inb(baseio + UART_LCR);
 418         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 419
 420         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 421         efr &= ~MOXA_MUST_EFR_SF_MASK;
 422
 423         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 424         outb(oldlcr, baseio + UART_LCR);
 425 }
 426
 427 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 428 {
 429         u8 oldlcr;
 430         u8 efr;
 431
 432         oldlcr = inb(baseio + UART_LCR);
 433         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 434
 435         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 436         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 437         efr |= MOXA_MUST_EFR_SF_TX1;
 438
 439         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 440         outb(oldlcr, baseio + UART_LCR);
 441 }
 442
 443 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 444 {
 445         u8 oldlcr;
 446         u8 efr;
 447
 448         oldlcr = inb(baseio + UART_LCR);
 449         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 450
 451         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 452         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 453
 454         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 455         outb(oldlcr, baseio + UART_LCR);
 456 }
 457
 458 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 459 {
 460         u8 oldlcr;
 461         u8 efr;
 462
 463         oldlcr = inb(baseio + UART_LCR);
 464         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 465
 466         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 467         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 468         efr |= MOXA_MUST_EFR_SF_RX1;
 469
 470         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 471         outb(oldlcr, baseio + UART_LCR);
 472 }
 473
 474 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 475 {
 476         u8 oldlcr;
 477         u8 efr;
 478
 479         oldlcr = inb(baseio + UART_LCR);
 480         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 481
 482         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 483         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 484
 485         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 486         outb(oldlcr, baseio + UART_LCR);
 487 }
 488
 489 #ifdef CONFIG_PCI
 490 static int __devinit CheckIsMoxaMust(unsigned long io)
 491 {
 492         u8 oldmcr, hwid;
 493         int i;
 494
 495         outb(0, io + UART_LCR);
 496         mxser_disable_must_enchance_mode(io);
 497         oldmcr = inb(io + UART_MCR);
 498         outb(0, io + UART_MCR);
 499         mxser_set_must_xon1_value(io, 0x11);
 500         if ((hwid = inb(io + UART_MCR)) != 0) {
 501                 outb(oldmcr, io + UART_MCR);
 502                 return MOXA_OTHER_UART;
 503         }
 504
 505         mxser_get_must_hardware_id(io, &hwid);
 506         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 507                 if (hwid == Gpci_uart_info[i].type)
 508                         return (int)hwid;
 509         }
 510         return MOXA_OTHER_UART;
 511 }
 512 #endif
 513
 514 static void process_txrx_fifo(struct mxser_port *info)
 515 {
 516         int i;
 517
 518         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 519                 info->rx_trigger = 1;
 520                 info->rx_high_water = 1;
 521                 info->rx_low_water = 1;
 522                 info->xmit_fifo_size = 1;
 523         } else
 524                 for (i = 0; i < UART_INFO_NUM; i++)
 525                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 526                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 527                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 528                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 529                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 530                                 break;
 531                         }
 532 }
 533
 534 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 535 {
 536         static unsigned char mxser_msr[MXSER_PORTS + 1];
 537         unsigned char status = 0;
 538
 539         status = inb(baseaddr + UART_MSR);
 540
 541         mxser_msr[port] &= 0x0F;
 542         mxser_msr[port] |= status;
 543         status = mxser_msr[port];
 544         if (mode)
 545                 mxser_msr[port] = 0;
 546
 547         return status;
 548 }
 549
 550 static int mxser_carrier_raised(struct tty_port *port)
 551 {
 552         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 553         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
 554 }
 555
 556 static void mxser_dtr_rts(struct tty_port *port, int on)
 557 {
 558         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 559         unsigned long flags;
 560
 561         spin_lock_irqsave(&mp->slock, flags);
 562         if (on)
 563                 outb(inb(mp->ioaddr + UART_MCR) |
 564                         UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
 565         else
 566                 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
 567                         mp->ioaddr + UART_MCR);
 568         spin_unlock_irqrestore(&mp->slock, flags);
 569 }
 570
 571 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 572 {
 573         struct mxser_port *info = tty->driver_data;
 574         int quot = 0, baud;
 575         unsigned char cval;
 576
 577         if (!info->ioaddr)
 578                 return -1;
 579
 580         if (newspd > info->max_baud)
 581                 return -1;
 582
 583         if (newspd == 134) {
 584                 quot = 2 * info->baud_base / 269;
 585                 tty_encode_baud_rate(tty, 134, 134);
 586         } else if (newspd) {
 587                 quot = info->baud_base / newspd;
 588                 if (quot == 0)
 589                         quot = 1;
 590                 baud = info->baud_base/quot;
 591                 tty_encode_baud_rate(tty, baud, baud);
 592         } else {
 593                 quot = 0;
 594         }
 595
 596         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 597         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 598
 599         if (quot) {
 600                 info->MCR |= UART_MCR_DTR;
 601                 outb(info->MCR, info->ioaddr + UART_MCR);
 602         } else {
 603                 info->MCR &= ~UART_MCR_DTR;
 604                 outb(info->MCR, info->ioaddr + UART_MCR);
 605                 return 0;
 606         }
 607
 608         cval = inb(info->ioaddr + UART_LCR);
 609
 610         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 611
 612         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 613         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 614         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 615
 616 #ifdef BOTHER
 617         if (C_BAUD(tty) == BOTHER) {
 618                 quot = info->baud_base % newspd;
 619                 quot *= 8;
 620                 if (quot % newspd > newspd / 2) {
 621                         quot /= newspd;
 622                         quot++;
 623                 } else
 624                         quot /= newspd;
 625
 626                 mxser_set_must_enum_value(info->ioaddr, quot);
 627         } else
 628 #endif
 629                 mxser_set_must_enum_value(info->ioaddr, 0);
 630
 631         return 0;
 632 }
 633
 634 /*
 635  * This routine is called to set the UART divisor registers to match
 636  * the specified baud rate for a serial port.
 637  */
 638 static int mxser_change_speed(struct tty_struct *tty,
 639                                         struct ktermios *old_termios)
 640 {
 641         struct mxser_port *info = tty->driver_data;
 642         unsigned cflag, cval, fcr;
 643         int ret = 0;
 644         unsigned char status;
 645
 646         cflag = tty->termios->c_cflag;
 647         if (!info->ioaddr)
 648                 return ret;
 649
 650         if (mxser_set_baud_method[tty->index] == 0)
 651                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 652
 653         /* byte size and parity */
 654         switch (cflag & CSIZE) {
 655         case CS5:
 656                 cval = 0x00;
 657                 break;
 658         case CS6:
 659                 cval = 0x01;
 660                 break;
 661         case CS7:
 662                 cval = 0x02;
 663                 break;
 664         case CS8:
 665                 cval = 0x03;
 666                 break;
 667         default:
 668                 cval = 0x00;
 669                 break;          /* too keep GCC shut... */
 670         }
 671         if (cflag & CSTOPB)
 672                 cval |= 0x04;
 673         if (cflag & PARENB)
 674                 cval |= UART_LCR_PARITY;
 675         if (!(cflag & PARODD))
 676                 cval |= UART_LCR_EPAR;
 677         if (cflag & CMSPAR)
 678                 cval |= UART_LCR_SPAR;
 679
 680         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 681                 if (info->board->chip_flag) {
 682                         fcr = UART_FCR_ENABLE_FIFO;
 683                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 684                         mxser_set_must_fifo_value(info);
 685                 } else
 686                         fcr = 0;
 687         } else {
 688                 fcr = UART_FCR_ENABLE_FIFO;
 689                 if (info->board->chip_flag) {
 690                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 691                         mxser_set_must_fifo_value(info);
 692                 } else {
 693                         switch (info->rx_trigger) {
 694                         case 1:
 695                                 fcr |= UART_FCR_TRIGGER_1;
 696                                 break;
 697                         case 4:
 698                                 fcr |= UART_FCR_TRIGGER_4;
 699                                 break;
 700                         case 8:
 701                                 fcr |= UART_FCR_TRIGGER_8;
 702                                 break;
 703                         default:
 704                                 fcr |= UART_FCR_TRIGGER_14;
 705                                 break;
 706                         }
 707                 }
 708         }
 709
 710         /* CTS flow control flag and modem status interrupts */
 711         info->IER &= ~UART_IER_MSI;
 712         info->MCR &= ~UART_MCR_AFE;
 713         if (cflag & CRTSCTS) {
 714                 info->port.flags |= ASYNC_CTS_FLOW;
 715                 info->IER |= UART_IER_MSI;
 716                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 717                         info->MCR |= UART_MCR_AFE;
 718                 } else {
 719                         status = inb(info->ioaddr + UART_MSR);
 720                         if (tty->hw_stopped) {
 721                                 if (status & UART_MSR_CTS) {
 722                                         tty->hw_stopped = 0;
 723                                         if (info->type != PORT_16550A &&
 724                                                         !info->board->chip_flag) {
 725                                                 outb(info->IER & ~UART_IER_THRI,
 726                                                         info->ioaddr +
 727                                                         UART_IER);
 728                                                 info->IER |= UART_IER_THRI;
 729                                                 outb(info->IER, info->ioaddr +
 730                                                                 UART_IER);
 731                                         }
 732                                         tty_wakeup(tty);
 733                                 }
 734                         } else {
 735                                 if (!(status & UART_MSR_CTS)) {
 736                                         tty->hw_stopped = 1;
 737                                         if ((info->type != PORT_16550A) &&
 738                                                         (!info->board->chip_flag)) {
 739                                                 info->IER &= ~UART_IER_THRI;
 740                                                 outb(info->IER, info->ioaddr +
 741                                                                 UART_IER);
 742                                         }
 743                                 }
 744                         }
 745                 }
 746         } else {
 747                 info->port.flags &= ~ASYNC_CTS_FLOW;
 748         }
 749         outb(info->MCR, info->ioaddr + UART_MCR);
 750         if (cflag & CLOCAL) {
 751                 info->port.flags &= ~ASYNC_CHECK_CD;
 752         } else {
 753                 info->port.flags |= ASYNC_CHECK_CD;
 754                 info->IER |= UART_IER_MSI;
 755         }
 756         outb(info->IER, info->ioaddr + UART_IER);
 757
 758         /*
 759          * Set up parity check flag
 760          */
 761         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 762         if (I_INPCK(tty))
 763                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 764         if (I_BRKINT(tty) || I_PARMRK(tty))
 765                 info->read_status_mask |= UART_LSR_BI;
 766
 767         info->ignore_status_mask = 0;
 768
 769         if (I_IGNBRK(tty)) {
 770                 info->ignore_status_mask |= UART_LSR_BI;
 771                 info->read_status_mask |= UART_LSR_BI;
 772                 /*
 773                  * If we're ignore parity and break indicators, ignore
 774                  * overruns too.  (For real raw support).
 775                  */
 776                 if (I_IGNPAR(tty)) {
 777                         info->ignore_status_mask |=
 778                                                 UART_LSR_OE |
 779                                                 UART_LSR_PE |
 780                                                 UART_LSR_FE;
 781                         info->read_status_mask |=
 782                                                 UART_LSR_OE |
 783                                                 UART_LSR_PE |
 784                                                 UART_LSR_FE;
 785                 }
 786         }
 787         if (info->board->chip_flag) {
 788                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 789                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 790                 if (I_IXON(tty)) {
 791                         mxser_enable_must_rx_software_flow_control(
 792                                         info->ioaddr);
 793                 } else {
 794                         mxser_disable_must_rx_software_flow_control(
 795                                         info->ioaddr);
 796                 }
 797                 if (I_IXOFF(tty)) {
 798                         mxser_enable_must_tx_software_flow_control(
 799                                         info->ioaddr);
 800                 } else {
 801                         mxser_disable_must_tx_software_flow_control(
 802                                         info->ioaddr);
 803                 }
 804         }
 805
 806
 807         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 808         outb(cval, info->ioaddr + UART_LCR);
 809
 810         return ret;
 811 }
 812
 813 static void mxser_check_modem_status(struct tty_struct *tty,
 814                                 struct mxser_port *port, int status)
 815 {
 816         /* update input line counters */
 817         if (status & UART_MSR_TERI)
 818                 port->icount.rng++;
 819         if (status & UART_MSR_DDSR)
 820                 port->icount.dsr++;
 821         if (status & UART_MSR_DDCD)
 822                 port->icount.dcd++;
 823         if (status & UART_MSR_DCTS)
 824                 port->icount.cts++;
 825         port->mon_data.modem_status = status;
 826         wake_up_interruptible(&port->port.delta_msr_wait);
 827
 828         if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
 829                 if (status & UART_MSR_DCD)
 830                         wake_up_interruptible(&port->port.open_wait);
 831         }
 832
 833         if (port->port.flags & ASYNC_CTS_FLOW) {
 834                 if (tty->hw_stopped) {
 835                         if (status & UART_MSR_CTS) {
 836                                 tty->hw_stopped = 0;
 837
 838                                 if ((port->type != PORT_16550A) &&
 839                                                 (!port->board->chip_flag)) {
 840                                         outb(port->IER & ~UART_IER_THRI,
 841                                                 port->ioaddr + UART_IER);
 842                                         port->IER |= UART_IER_THRI;
 843                                         outb(port->IER, port->ioaddr +
 844                                                         UART_IER);
 845                                 }
 846                                 tty_wakeup(tty);
 847                         }
 848                 } else {
 849                         if (!(status & UART_MSR_CTS)) {
 850                                 tty->hw_stopped = 1;
 851                                 if (port->type != PORT_16550A &&
 852                                                 !port->board->chip_flag) {
 853                                         port->IER &= ~UART_IER_THRI;
 854                                         outb(port->IER, port->ioaddr +
 855                                                         UART_IER);
 856                                 }
 857                         }
 858                 }
 859         }
 860 }
 861
 862 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 863 {
 864         struct mxser_port *info = container_of(port, struct mxser_port, port);
 865         unsigned long page;
 866         unsigned long flags;
 867
 868         page = __get_free_page(GFP_KERNEL);
 869         if (!page)
 870                 return -ENOMEM;
 871
 872         spin_lock_irqsave(&info->slock, flags);
 873
 874         if (!info->ioaddr || !info->type) {
 875                 set_bit(TTY_IO_ERROR, &tty->flags);
 876                 free_page(page);
 877                 spin_unlock_irqrestore(&info->slock, flags);
 878                 return 0;
 879         }
 880         info->port.xmit_buf = (unsigned char *) page;
 881
 882         /*
 883          * Clear the FIFO buffers and disable them
 884          * (they will be reenabled in mxser_change_speed())
 885          */
 886         if (info->board->chip_flag)
 887                 outb((UART_FCR_CLEAR_RCVR |
 888                         UART_FCR_CLEAR_XMIT |
 889                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 890         else
 891                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 892                         info->ioaddr + UART_FCR);
 893
 894         /*
 895          * At this point there's no way the LSR could still be 0xFF;
 896          * if it is, then bail out, because there's likely no UART
 897          * here.
 898          */
 899         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 900                 spin_unlock_irqrestore(&info->slock, flags);
 901                 if (capable(CAP_SYS_ADMIN)) {
 902                         set_bit(TTY_IO_ERROR, &tty->flags);
 903                         return 0;
 904                 } else
 905                         return -ENODEV;
 906         }
 907
 908         /*
 909          * Clear the interrupt registers.
 910          */
 911         (void) inb(info->ioaddr + UART_LSR);
 912         (void) inb(info->ioaddr + UART_RX);
 913         (void) inb(info->ioaddr + UART_IIR);
 914         (void) inb(info->ioaddr + UART_MSR);
 915
 916         /*
 917          * Now, initialize the UART
 918          */
 919         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 920         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 921         outb(info->MCR, info->ioaddr + UART_MCR);
 922
 923         /*
 924          * Finally, enable interrupts
 925          */
 926         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 927
 928         if (info->board->chip_flag)
 929                 info->IER |= MOXA_MUST_IER_EGDAI;
 930         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 931
 932         /*
 933          * And clear the interrupt registers again for luck.
 934          */
 935         (void) inb(info->ioaddr + UART_LSR);
 936         (void) inb(info->ioaddr + UART_RX);
 937         (void) inb(info->ioaddr + UART_IIR);
 938         (void) inb(info->ioaddr + UART_MSR);
 939
 940         clear_bit(TTY_IO_ERROR, &tty->flags);
 941         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 942
 943         /*
 944          * and set the speed of the serial port
 945          */
 946         mxser_change_speed(tty, NULL);
 947         spin_unlock_irqrestore(&info->slock, flags);
 948
 949         return 0;
 950 }
 951
 952 /*
 953  * This routine will shutdown a serial port
 954  */
 955 static void mxser_shutdown_port(struct tty_port *port)
 956 {
 957         struct mxser_port *info = container_of(port, struct mxser_port, port);
 958         unsigned long flags;
 959
 960         spin_lock_irqsave(&info->slock, flags);
 961
 962         /*
 963          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 964          * here so the queue might never be waken up
 965          */
 966         wake_up_interruptible(&info->port.delta_msr_wait);
 967
 968         /*
 969          * Free the xmit buffer, if necessary
 970          */
 971         if (info->port.xmit_buf) {
 972                 free_page((unsigned long) info->port.xmit_buf);
 973                 info->port.xmit_buf = NULL;
 974         }
 975
 976         info->IER = 0;
 977         outb(0x00, info->ioaddr + UART_IER);
 978
 979         /* clear Rx/Tx FIFO's */
 980         if (info->board->chip_flag)
 981                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 982                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 983                                 info->ioaddr + UART_FCR);
 984         else
 985                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 986                         info->ioaddr + UART_FCR);
 987
 988         /* read data port to reset things */
 989         (void) inb(info->ioaddr + UART_RX);
 990
 991
 992         if (info->board->chip_flag)
 993                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 994
 995         spin_unlock_irqrestore(&info->slock, flags);
 996 }
 997
 998 /*
 999  * This routine is called whenever a serial port is opened.  It
1000  * enables interrupts for a serial port, linking in its async structure into
1001  * the IRQ chain.   It also performs the serial-specific
1002  * initialization for the tty structure.
1003  */
1004 static int mxser_open(struct tty_struct *tty, struct file *filp)
1005 {
1006         struct mxser_port *info;
1007         int line;
1008
1009         line = tty->index;
1010         if (line == MXSER_PORTS)
1011                 return 0;
1012         if (line < 0 || line > MXSER_PORTS)
1013                 return -ENODEV;
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         mutex_lock(&port->mutex);
1087         mxser_close_port(port);
1088         mxser_flush_buffer(tty);
1089         mxser_shutdown_port(port);
1090         clear_bit(ASYNCB_INITIALIZED, &port->flags);
1091         mutex_unlock(&port->mutex);
1092         /* Right now the tty_port set is done outside of the close_end helper
1093            as we don't yet have everyone using refcounts */
1094         tty_port_close_end(port, tty);
1095         tty_port_tty_set(port, NULL);
1096 }
1097
1098 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1099 {
1100         int c, total = 0;
1101         struct mxser_port *info = tty->driver_data;
1102         unsigned long flags;
1103
1104         if (!info->port.xmit_buf)
1105                 return 0;
1106
1107         while (1) {
1108                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1109                                           SERIAL_XMIT_SIZE - info->xmit_head));
1110                 if (c <= 0)
1111                         break;
1112
1113                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1114                 spin_lock_irqsave(&info->slock, flags);
1115                 info->xmit_head = (info->xmit_head + c) &
1116                                   (SERIAL_XMIT_SIZE - 1);
1117                 info->xmit_cnt += c;
1118                 spin_unlock_irqrestore(&info->slock, flags);
1119
1120                 buf += c;
1121                 count -= c;
1122                 total += c;
1123         }
1124
1125         if (info->xmit_cnt && !tty->stopped) {
1126                 if (!tty->hw_stopped ||
1127                                 (info->type == PORT_16550A) ||
1128                                 (info->board->chip_flag)) {
1129                         spin_lock_irqsave(&info->slock, flags);
1130                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1131                                         UART_IER);
1132                         info->IER |= UART_IER_THRI;
1133                         outb(info->IER, info->ioaddr + UART_IER);
1134                         spin_unlock_irqrestore(&info->slock, flags);
1135                 }
1136         }
1137         return total;
1138 }
1139
1140 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1141 {
1142         struct mxser_port *info = tty->driver_data;
1143         unsigned long flags;
1144
1145         if (!info->port.xmit_buf)
1146                 return 0;
1147
1148         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1149                 return 0;
1150
1151         spin_lock_irqsave(&info->slock, flags);
1152         info->port.xmit_buf[info->xmit_head++] = ch;
1153         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1154         info->xmit_cnt++;
1155         spin_unlock_irqrestore(&info->slock, flags);
1156         if (!tty->stopped) {
1157                 if (!tty->hw_stopped ||
1158                                 (info->type == PORT_16550A) ||
1159                                 info->board->chip_flag) {
1160                         spin_lock_irqsave(&info->slock, flags);
1161                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1162                         info->IER |= UART_IER_THRI;
1163                         outb(info->IER, info->ioaddr + UART_IER);
1164                         spin_unlock_irqrestore(&info->slock, flags);
1165                 }
1166         }
1167         return 1;
1168 }
1169
1170
1171 static void mxser_flush_chars(struct tty_struct *tty)
1172 {
1173         struct mxser_port *info = tty->driver_data;
1174         unsigned long flags;
1175
1176         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1177                         (tty->hw_stopped && info->type != PORT_16550A &&
1178                          !info->board->chip_flag))
1179                 return;
1180
1181         spin_lock_irqsave(&info->slock, flags);
1182
1183         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1184         info->IER |= UART_IER_THRI;
1185         outb(info->IER, info->ioaddr + UART_IER);
1186
1187         spin_unlock_irqrestore(&info->slock, flags);
1188 }
1189
1190 static int mxser_write_room(struct tty_struct *tty)
1191 {
1192         struct mxser_port *info = tty->driver_data;
1193         int ret;
1194
1195         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1196         return ret < 0 ? 0 : ret;
1197 }
1198
1199 static int mxser_chars_in_buffer(struct tty_struct *tty)
1200 {
1201         struct mxser_port *info = tty->driver_data;
1202         return info->xmit_cnt;
1203 }
1204
1205 /*
1206  * ------------------------------------------------------------
1207  * friends of mxser_ioctl()
1208  * ------------------------------------------------------------
1209  */
1210 static int mxser_get_serial_info(struct tty_struct *tty,
1211                 struct serial_struct __user *retinfo)
1212 {
1213         struct mxser_port *info = tty->driver_data;
1214         struct serial_struct tmp = {
1215                 .type = info->type,
1216                 .line = tty->index,
1217                 .port = info->ioaddr,
1218                 .irq = info->board->irq,
1219                 .flags = info->port.flags,
1220                 .baud_base = info->baud_base,
1221                 .close_delay = info->port.close_delay,
1222                 .closing_wait = info->port.closing_wait,
1223                 .custom_divisor = info->custom_divisor,
1224                 .hub6 = 0
1225         };
1226         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1227                 return -EFAULT;
1228         return 0;
1229 }
1230
1231 static int mxser_set_serial_info(struct tty_struct *tty,
1232                 struct serial_struct __user *new_info)
1233 {
1234         struct mxser_port *info = tty->driver_data;
1235         struct tty_port *port = &info->port;
1236         struct serial_struct new_serial;
1237         speed_t baud;
1238         unsigned long sl_flags;
1239         unsigned int flags;
1240         int retval = 0;
1241
1242         if (!new_info || !info->ioaddr)
1243                 return -ENODEV;
1244         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1245                 return -EFAULT;
1246
1247         if (new_serial.irq != info->board->irq ||
1248                         new_serial.port != info->ioaddr)
1249                 return -EINVAL;
1250
1251         flags = port->flags & ASYNC_SPD_MASK;
1252
1253         if (!capable(CAP_SYS_ADMIN)) {
1254                 if ((new_serial.baud_base != info->baud_base) ||
1255                                 (new_serial.close_delay != info->port.close_delay) ||
1256                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1257                         return -EPERM;
1258                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1259                                 (new_serial.flags & ASYNC_USR_MASK));
1260         } else {
1261                 /*
1262                  * OK, past this point, all the error checking has been done.
1263                  * At this point, we start making changes.....
1264                  */
1265                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1266                                 (new_serial.flags & ASYNC_FLAGS));
1267                 port->close_delay = new_serial.close_delay * HZ / 100;
1268                 port->closing_wait = new_serial.closing_wait * HZ / 100;
1269                 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1270                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1271                                 (new_serial.baud_base != info->baud_base ||
1272                                 new_serial.custom_divisor !=
1273                                 info->custom_divisor)) {
1274                         if (new_serial.custom_divisor == 0)
1275                                 return -EINVAL;
1276                         baud = new_serial.baud_base / new_serial.custom_divisor;
1277                         tty_encode_baud_rate(tty, baud, baud);
1278                 }
1279         }
1280
1281         info->type = new_serial.type;
1282
1283         process_txrx_fifo(info);
1284
1285         if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
1286                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1287                         spin_lock_irqsave(&info->slock, sl_flags);
1288                         mxser_change_speed(tty, NULL);
1289                         spin_unlock_irqrestore(&info->slock, sl_flags);
1290                 }
1291         } else {
1292                 retval = mxser_activate(port, tty);
1293                 if (retval == 0)
1294                         set_bit(ASYNCB_INITIALIZED, &port->flags);
1295         }
1296         return retval;
1297 }
1298
1299 /*
1300  * mxser_get_lsr_info - get line status register info
1301  *
1302  * Purpose: Let user call ioctl() to get info when the UART physically
1303  *          is emptied.  On bus types like RS485, the transmitter must
1304  *          release the bus after transmitting. This must be done when
1305  *          the transmit shift register is empty, not be done when the
1306  *          transmit holding register is empty.  This functionality
1307  *          allows an RS485 driver to be written in user space.
1308  */
1309 static int mxser_get_lsr_info(struct mxser_port *info,
1310                 unsigned int __user *value)
1311 {
1312         unsigned char status;
1313         unsigned int result;
1314         unsigned long flags;
1315
1316         spin_lock_irqsave(&info->slock, flags);
1317         status = inb(info->ioaddr + UART_LSR);
1318         spin_unlock_irqrestore(&info->slock, flags);
1319         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1320         return put_user(result, value);
1321 }
1322
1323 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
1324 {
1325         struct mxser_port *info = tty->driver_data;
1326         unsigned char control, status;
1327         unsigned long flags;
1328
1329
1330         if (tty->index == MXSER_PORTS)
1331                 return -ENOIOCTLCMD;
1332         if (test_bit(TTY_IO_ERROR, &tty->flags))
1333                 return -EIO;
1334
1335         control = info->MCR;
1336
1337         spin_lock_irqsave(&info->slock, flags);
1338         status = inb(info->ioaddr + UART_MSR);
1339         if (status & UART_MSR_ANY_DELTA)
1340                 mxser_check_modem_status(tty, info, status);
1341         spin_unlock_irqrestore(&info->slock, flags);
1342         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1343                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1344                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1345                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1346                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1347                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1348 }
1349
1350 static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
1351                 unsigned int set, unsigned int clear)
1352 {
1353         struct mxser_port *info = tty->driver_data;
1354         unsigned long flags;
1355
1356
1357         if (tty->index == MXSER_PORTS)
1358                 return -ENOIOCTLCMD;
1359         if (test_bit(TTY_IO_ERROR, &tty->flags))
1360                 return -EIO;
1361
1362         spin_lock_irqsave(&info->slock, flags);
1363
1364         if (set & TIOCM_RTS)
1365                 info->MCR |= UART_MCR_RTS;
1366         if (set & TIOCM_DTR)
1367                 info->MCR |= UART_MCR_DTR;
1368
1369         if (clear & TIOCM_RTS)
1370                 info->MCR &= ~UART_MCR_RTS;
1371         if (clear & TIOCM_DTR)
1372                 info->MCR &= ~UART_MCR_DTR;
1373
1374         outb(info->MCR, info->ioaddr + UART_MCR);
1375         spin_unlock_irqrestore(&info->slock, flags);
1376         return 0;
1377 }
1378
1379 static int __init mxser_program_mode(int port)
1380 {
1381         int id, i, j, n;
1382
1383         outb(0, port);
1384         outb(0, port);
1385         outb(0, port);
1386         (void)inb(port);
1387         (void)inb(port);
1388         outb(0, port);
1389         (void)inb(port);
1390
1391         id = inb(port + 1) & 0x1F;
1392         if ((id != C168_ASIC_ID) &&
1393                         (id != C104_ASIC_ID) &&
1394                         (id != C102_ASIC_ID) &&
1395                         (id != CI132_ASIC_ID) &&
1396                         (id != CI134_ASIC_ID) &&
1397                         (id != CI104J_ASIC_ID))
1398                 return -1;
1399         for (i = 0, j = 0; i < 4; i++) {
1400                 n = inb(port + 2);
1401                 if (n == 'M') {
1402                         j = 1;
1403                 } else if ((j == 1) && (n == 1)) {
1404                         j = 2;
1405                         break;
1406                 } else
1407                         j = 0;
1408         }
1409         if (j != 2)
1410                 id = -2;
1411         return id;
1412 }
1413
1414 static void __init mxser_normal_mode(int port)
1415 {
1416         int i, n;
1417
1418         outb(0xA5, port + 1);
1419         outb(0x80, port + 3);
1420         outb(12, port + 0);     /* 9600 bps */
1421         outb(0, port + 1);
1422         outb(0x03, port + 3);   /* 8 data bits */
1423         outb(0x13, port + 4);   /* loop back mode */
1424         for (i = 0; i < 16; i++) {
1425                 n = inb(port + 5);
1426                 if ((n & 0x61) == 0x60)
1427                         break;
1428                 if ((n & 1) == 1)
1429                         (void)inb(port);
1430         }
1431         outb(0x00, port + 4);
1432 }
1433
1434 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1435 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1436 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1437 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1438 #define EN_CCMD         0x000   /* Chip's command register     */
1439 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1440 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1441 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1442 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1443 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1444 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1445 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1446 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1447 static int __init mxser_read_register(int port, unsigned short *regs)
1448 {
1449         int i, k, value, id;
1450         unsigned int j;
1451
1452         id = mxser_program_mode(port);
1453         if (id < 0)
1454                 return id;
1455         for (i = 0; i < 14; i++) {
1456                 k = (i & 0x3F) | 0x180;
1457                 for (j = 0x100; j > 0; j >>= 1) {
1458                         outb(CHIP_CS, port);
1459                         if (k & j) {
1460                                 outb(CHIP_CS | CHIP_DO, port);
1461                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1462                         } else {
1463                                 outb(CHIP_CS, port);
1464                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1465                         }
1466                 }
1467                 (void)inb(port);
1468                 value = 0;
1469                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1470                         outb(CHIP_CS, port);
1471                         outb(CHIP_CS | CHIP_SK, port);
1472                         if (inb(port) & CHIP_DI)
1473                                 value |= j;
1474                 }
1475                 regs[i] = value;
1476                 outb(0, port);
1477         }
1478         mxser_normal_mode(port);
1479         return id;
1480 }
1481
1482 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1483 {
1484         struct mxser_port *ip;
1485         struct tty_port *port;
1486         struct tty_struct *tty;
1487         int result, status;
1488         unsigned int i, j;
1489         int ret = 0;
1490
1491         switch (cmd) {
1492         case MOXA_GET_MAJOR:
1493                 if (printk_ratelimit())
1494                         printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1495                                         "%x (GET_MAJOR), fix your userspace\n",
1496                                         current->comm, cmd);
1497                 return put_user(ttymajor, (int __user *)argp);
1498
1499         case MOXA_CHKPORTENABLE:
1500                 result = 0;
1501                 for (i = 0; i < MXSER_BOARDS; i++)
1502                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1503                                 if (mxser_boards[i].ports[j].ioaddr)
1504                                         result |= (1 << i);
1505                 return put_user(result, (unsigned long __user *)argp);
1506         case MOXA_GETDATACOUNT:
1507                 /* The receive side is locked by port->slock but it isn't
1508                    clear that an exact snapshot is worth copying here */
1509                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1510                         ret = -EFAULT;
1511                 return ret;
1512         case MOXA_GETMSTATUS: {
1513                 struct mxser_mstatus ms, __user *msu = argp;
1514                 for (i = 0; i < MXSER_BOARDS; i++)
1515                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1516                                 ip = &mxser_boards[i].ports[j];
1517                                 port = &ip->port;
1518                                 memset(&ms, 0, sizeof(ms));
1519
1520                                 mutex_lock(&port->mutex);
1521                                 if (!ip->ioaddr)
1522                                         goto copy;
1523
1524                                 tty = tty_port_tty_get(port);
1525
1526                                 if (!tty || !tty->termios)
1527                                         ms.cflag = ip->normal_termios.c_cflag;
1528                                 else
1529                                         ms.cflag = tty->termios->c_cflag;
1530                                 tty_kref_put(tty);
1531                                 spin_lock_irq(&ip->slock);
1532                                 status = inb(ip->ioaddr + UART_MSR);
1533                                 spin_unlock_irq(&ip->slock);
1534                                 if (status & UART_MSR_DCD)
1535                                         ms.dcd = 1;
1536                                 if (status & UART_MSR_DSR)
1537                                         ms.dsr = 1;
1538                                 if (status & UART_MSR_CTS)
1539                                         ms.cts = 1;
1540                         copy:
1541                                 mutex_unlock(&port->mutex);
1542                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1543                                         return -EFAULT;
1544                                 msu++;
1545                         }
1546                 return 0;
1547         }
1548         case MOXA_ASPP_MON_EXT: {
1549                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1550                 unsigned int cflag, iflag, p;
1551                 u8 opmode;
1552
1553                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1554                 if (!me)
1555                         return -ENOMEM;
1556
1557                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1558                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1559                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1560                                         i = MXSER_BOARDS;
1561                                         break;
1562                                 }
1563                                 ip = &mxser_boards[i].ports[j];
1564                                 port = &ip->port;
1565
1566                                 mutex_lock(&port->mutex);
1567                                 if (!ip->ioaddr) {
1568                                         mutex_unlock(&port->mutex);
1569                                         continue;
1570                                 }
1571
1572                                 spin_lock_irq(&ip->slock);
1573                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1574
1575                                 if (status & UART_MSR_TERI)
1576                                         ip->icount.rng++;
1577                                 if (status & UART_MSR_DDSR)
1578                                         ip->icount.dsr++;
1579                                 if (status & UART_MSR_DDCD)
1580                                         ip->icount.dcd++;
1581                                 if (status & UART_MSR_DCTS)
1582                                         ip->icount.cts++;
1583
1584                                 ip->mon_data.modem_status = status;
1585                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1586                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1587                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1588                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1589                                 me->modem_status[p] =
1590                                         ip->mon_data.modem_status;
1591                                 spin_unlock_irq(&ip->slock);
1592
1593                                 tty = tty_port_tty_get(&ip->port);
1594
1595                                 if (!tty || !tty->termios) {
1596                                         cflag = ip->normal_termios.c_cflag;
1597                                         iflag = ip->normal_termios.c_iflag;
1598                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1599                                 } else {
1600                                         cflag = tty->termios->c_cflag;
1601                                         iflag = tty->termios->c_iflag;
1602                                         me->baudrate[p] = tty_get_baud_rate(tty);
1603                                 }
1604                                 tty_kref_put(tty);
1605
1606                                 me->databits[p] = cflag & CSIZE;
1607                                 me->stopbits[p] = cflag & CSTOPB;
1608                                 me->parity[p] = cflag & (PARENB | PARODD |
1609                                                 CMSPAR);
1610
1611                                 if (cflag & CRTSCTS)
1612                                         me->flowctrl[p] |= 0x03;
1613
1614                                 if (iflag & (IXON | IXOFF))
1615                                         me->flowctrl[p] |= 0x0C;
1616
1617                                 if (ip->type == PORT_16550A)
1618                                         me->fifo[p] = 1;
1619
1620                                 opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1621                                 opmode &= OP_MODE_MASK;
1622                                 me->iftype[p] = opmode;
1623                                 mutex_unlock(&port->mutex);
1624                         }
1625                 }
1626                 if (copy_to_user(argp, me, sizeof(*me)))
1627                         ret = -EFAULT;
1628                 kfree(me);
1629                 return ret;
1630         }
1631         default:
1632                 return -ENOIOCTLCMD;
1633         }
1634         return 0;
1635 }
1636
1637 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1638                 struct async_icount *cprev)
1639 {
1640         struct async_icount cnow;
1641         unsigned long flags;
1642         int ret;
1643
1644         spin_lock_irqsave(&info->slock, flags);
1645         cnow = info->icount;    /* atomic copy */
1646         spin_unlock_irqrestore(&info->slock, flags);
1647
1648         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1649                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1650                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1651                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1652
1653         *cprev = cnow;
1654
1655         return ret;
1656 }
1657
1658 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1659                 unsigned int cmd, unsigned long arg)
1660 {
1661         struct mxser_port *info = tty->driver_data;
1662         struct tty_port *port = &info->port;
1663         struct async_icount cnow;
1664         unsigned long flags;
1665         void __user *argp = (void __user *)arg;
1666         int retval;
1667
1668         if (tty->index == MXSER_PORTS)
1669                 return mxser_ioctl_special(cmd, argp);
1670
1671         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1672                 int p;
1673                 unsigned long opmode;
1674                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1675                 int shiftbit;
1676                 unsigned char val, mask;
1677
1678                 p = tty->index % 4;
1679                 if (cmd == MOXA_SET_OP_MODE) {
1680                         if (get_user(opmode, (int __user *) argp))
1681                                 return -EFAULT;
1682                         if (opmode != RS232_MODE &&
1683                                         opmode != RS485_2WIRE_MODE &&
1684                                         opmode != RS422_MODE &&
1685                                         opmode != RS485_4WIRE_MODE)
1686                                 return -EFAULT;
1687                         mask = ModeMask[p];
1688                         shiftbit = p * 2;
1689                         spin_lock_irq(&info->slock);
1690                         val = inb(info->opmode_ioaddr);
1691                         val &= mask;
1692                         val |= (opmode << shiftbit);
1693                         outb(val, info->opmode_ioaddr);
1694                         spin_unlock_irq(&info->slock);
1695                 } else {
1696                         shiftbit = p * 2;
1697                         spin_lock_irq(&info->slock);
1698                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1699                         spin_unlock_irq(&info->slock);
1700                         opmode &= OP_MODE_MASK;
1701                         if (put_user(opmode, (int __user *)argp))
1702                                 return -EFAULT;
1703                 }
1704                 return 0;
1705         }
1706
1707         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT &&
1708                         test_bit(TTY_IO_ERROR, &tty->flags))
1709                 return -EIO;
1710
1711         switch (cmd) {
1712         case TIOCGSERIAL:
1713                 mutex_lock(&port->mutex);
1714                 retval = mxser_get_serial_info(tty, argp);
1715                 mutex_unlock(&port->mutex);
1716                 return retval;
1717         case TIOCSSERIAL:
1718                 mutex_lock(&port->mutex);
1719                 retval = mxser_set_serial_info(tty, argp);
1720                 mutex_unlock(&port->mutex);
1721                 return retval;
1722         case TIOCSERGETLSR:     /* Get line status register */
1723                 return  mxser_get_lsr_info(info, argp);
1724                 /*
1725                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1726                  * - mask passed in arg for lines of interest
1727                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1728                  * Caller should use TIOCGICOUNT to see which one it was
1729                  */
1730         case TIOCMIWAIT:
1731                 spin_lock_irqsave(&info->slock, flags);
1732                 cnow = info->icount;    /* note the counters on entry */
1733                 spin_unlock_irqrestore(&info->slock, flags);
1734
1735                 return wait_event_interruptible(info->port.delta_msr_wait,
1736                                 mxser_cflags_changed(info, arg, &cnow));
1737         case MOXA_HighSpeedOn:
1738                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1739         case MOXA_SDS_RSTICOUNTER:
1740                 spin_lock_irq(&info->slock);
1741                 info->mon_data.rxcnt = 0;
1742                 info->mon_data.txcnt = 0;
1743                 spin_unlock_irq(&info->slock);
1744                 return 0;
1745
1746         case MOXA_ASPP_OQUEUE:{
1747                 int len, lsr;
1748
1749                 len = mxser_chars_in_buffer(tty);
1750                 spin_lock_irq(&info->slock);
1751                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1752                 spin_unlock_irq(&info->slock);
1753                 len += (lsr ? 0 : 1);
1754
1755                 return put_user(len, (int __user *)argp);
1756         }
1757         case MOXA_ASPP_MON: {
1758                 int mcr, status;
1759
1760                 spin_lock_irq(&info->slock);
1761                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1762                 mxser_check_modem_status(tty, info, status);
1763
1764                 mcr = inb(info->ioaddr + UART_MCR);
1765                 spin_unlock_irq(&info->slock);
1766
1767                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1768                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1769                 else
1770                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1771
1772                 if (mcr & MOXA_MUST_MCR_TX_XON)
1773                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1774                 else
1775                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1776
1777                 if (tty->hw_stopped)
1778                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1779                 else
1780                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1781
1782                 if (copy_to_user(argp, &info->mon_data,
1783                                 sizeof(struct mxser_mon)))
1784                         return -EFAULT;
1785
1786                 return 0;
1787         }
1788         case MOXA_ASPP_LSTATUS: {
1789                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1790                         return -EFAULT;
1791
1792                 info->err_shadow = 0;
1793                 return 0;
1794         }
1795         case MOXA_SET_BAUD_METHOD: {
1796                 int method;
1797
1798                 if (get_user(method, (int __user *)argp))
1799                         return -EFAULT;
1800                 mxser_set_baud_method[tty->index] = method;
1801                 return put_user(method, (int __user *)argp);
1802         }
1803         default:
1804                 return -ENOIOCTLCMD;
1805         }
1806         return 0;
1807 }
1808
1809         /*
1810          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1811          * Return: write counters to the user passed counter struct
1812          * NB: both 1->0 and 0->1 transitions are counted except for
1813          *     RI where only 0->1 is counted.
1814          */
1815
1816 static int mxser_get_icount(struct tty_struct *tty,
1817                 struct serial_icounter_struct *icount)
1818
1819 {
1820         struct mxser_port *info = tty->driver_data;
1821         struct async_icount cnow;
1822         unsigned long flags;
1823
1824         spin_lock_irqsave(&info->slock, flags);
1825         cnow = info->icount;
1826         spin_unlock_irqrestore(&info->slock, flags);
1827
1828         icount->frame = cnow.frame;
1829         icount->brk = cnow.brk;
1830         icount->overrun = cnow.overrun;
1831         icount->buf_overrun = cnow.buf_overrun;
1832         icount->parity = cnow.parity;
1833         icount->rx = cnow.rx;
1834         icount->tx = cnow.tx;
1835         icount->cts = cnow.cts;
1836         icount->dsr = cnow.dsr;
1837         icount->rng = cnow.rng;
1838         icount->dcd = cnow.dcd;
1839         return 0;
1840 }
1841
1842 static void mxser_stoprx(struct tty_struct *tty)
1843 {
1844         struct mxser_port *info = tty->driver_data;
1845
1846         info->ldisc_stop_rx = 1;
1847         if (I_IXOFF(tty)) {
1848                 if (info->board->chip_flag) {
1849                         info->IER &= ~MOXA_MUST_RECV_ISR;
1850                         outb(info->IER, info->ioaddr + UART_IER);
1851                 } else {
1852                         info->x_char = STOP_CHAR(tty);
1853                         outb(0, info->ioaddr + UART_IER);
1854                         info->IER |= UART_IER_THRI;
1855                         outb(info->IER, info->ioaddr + UART_IER);
1856                 }
1857         }
1858
1859         if (tty->termios->c_cflag & CRTSCTS) {
1860                 info->MCR &= ~UART_MCR_RTS;
1861                 outb(info->MCR, info->ioaddr + UART_MCR);
1862         }
1863 }
1864
1865 /*
1866  * This routine is called by the upper-layer tty layer to signal that
1867  * incoming characters should be throttled.
1868  */
1869 static void mxser_throttle(struct tty_struct *tty)
1870 {
1871         mxser_stoprx(tty);
1872 }
1873
1874 static void mxser_unthrottle(struct tty_struct *tty)
1875 {
1876         struct mxser_port *info = tty->driver_data;
1877
1878         /* startrx */
1879         info->ldisc_stop_rx = 0;
1880         if (I_IXOFF(tty)) {
1881                 if (info->x_char)
1882                         info->x_char = 0;
1883                 else {
1884                         if (info->board->chip_flag) {
1885                                 info->IER |= MOXA_MUST_RECV_ISR;
1886                                 outb(info->IER, info->ioaddr + UART_IER);
1887                         } else {
1888                                 info->x_char = START_CHAR(tty);
1889                                 outb(0, info->ioaddr + UART_IER);
1890                                 info->IER |= UART_IER_THRI;
1891                                 outb(info->IER, info->ioaddr + UART_IER);
1892                         }
1893                 }
1894         }
1895
1896         if (tty->termios->c_cflag & CRTSCTS) {
1897                 info->MCR |= UART_MCR_RTS;
1898                 outb(info->MCR, info->ioaddr + UART_MCR);
1899         }
1900 }
1901
1902 /*
1903  * mxser_stop() and mxser_start()
1904  *
1905  * This routines are called before setting or resetting tty->stopped.
1906  * They enable or disable transmitter interrupts, as necessary.
1907  */
1908 static void mxser_stop(struct tty_struct *tty)
1909 {
1910         struct mxser_port *info = tty->driver_data;
1911         unsigned long flags;
1912
1913         spin_lock_irqsave(&info->slock, flags);
1914         if (info->IER & UART_IER_THRI) {
1915                 info->IER &= ~UART_IER_THRI;
1916                 outb(info->IER, info->ioaddr + UART_IER);
1917         }
1918         spin_unlock_irqrestore(&info->slock, flags);
1919 }
1920
1921 static void mxser_start(struct tty_struct *tty)
1922 {
1923         struct mxser_port *info = tty->driver_data;
1924         unsigned long flags;
1925
1926         spin_lock_irqsave(&info->slock, flags);
1927         if (info->xmit_cnt && info->port.xmit_buf) {
1928                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1929                 info->IER |= UART_IER_THRI;
1930                 outb(info->IER, info->ioaddr + UART_IER);
1931         }
1932         spin_unlock_irqrestore(&info->slock, flags);
1933 }
1934
1935 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1936 {
1937         struct mxser_port *info = tty->driver_data;
1938         unsigned long flags;
1939
1940         spin_lock_irqsave(&info->slock, flags);
1941         mxser_change_speed(tty, old_termios);
1942         spin_unlock_irqrestore(&info->slock, flags);
1943
1944         if ((old_termios->c_cflag & CRTSCTS) &&
1945                         !(tty->termios->c_cflag & CRTSCTS)) {
1946                 tty->hw_stopped = 0;
1947                 mxser_start(tty);
1948         }
1949
1950         /* Handle sw stopped */
1951         if ((old_termios->c_iflag & IXON) &&
1952                         !(tty->termios->c_iflag & IXON)) {
1953                 tty->stopped = 0;
1954
1955                 if (info->board->chip_flag) {
1956                         spin_lock_irqsave(&info->slock, flags);
1957                         mxser_disable_must_rx_software_flow_control(
1958                                         info->ioaddr);
1959                         spin_unlock_irqrestore(&info->slock, flags);
1960                 }
1961
1962                 mxser_start(tty);
1963         }
1964 }
1965
1966 /*
1967  * mxser_wait_until_sent() --- wait until the transmitter is empty
1968  */
1969 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1970 {
1971         struct mxser_port *info = tty->driver_data;
1972         unsigned long orig_jiffies, char_time;
1973         unsigned long flags;
1974         int lsr;
1975
1976         if (info->type == PORT_UNKNOWN)
1977                 return;
1978
1979         if (info->xmit_fifo_size == 0)
1980                 return;         /* Just in case.... */
1981
1982         orig_jiffies = jiffies;
1983         /*
1984          * Set the check interval to be 1/5 of the estimated time to
1985          * send a single character, and make it at least 1.  The check
1986          * interval should also be less than the timeout.
1987          *
1988          * Note: we have to use pretty tight timings here to satisfy
1989          * the NIST-PCTS.
1990          */
1991         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1992         char_time = char_time / 5;
1993         if (char_time == 0)
1994                 char_time = 1;
1995         if (timeout && timeout < char_time)
1996                 char_time = timeout;
1997         /*
1998          * If the transmitter hasn't cleared in twice the approximate
1999          * amount of time to send the entire FIFO, it probably won't
2000          * ever clear.  This assumes the UART isn't doing flow
2001          * control, which is currently the case.  Hence, if it ever
2002          * takes longer than info->timeout, this is probably due to a
2003          * UART bug of some kind.  So, we clamp the timeout parameter at
2004          * 2*info->timeout.
2005          */
2006         if (!timeout || timeout > 2 * info->timeout)
2007                 timeout = 2 * info->timeout;
2008 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2009         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
2010                 timeout, char_time);
2011         printk("jiff=%lu...", jiffies);
2012 #endif
2013         spin_lock_irqsave(&info->slock, flags);
2014         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2015 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2016                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
2017 #endif
2018                 spin_unlock_irqrestore(&info->slock, flags);
2019                 schedule_timeout_interruptible(char_time);
2020                 spin_lock_irqsave(&info->slock, flags);
2021                 if (signal_pending(current))
2022                         break;
2023                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2024                         break;
2025         }
2026         spin_unlock_irqrestore(&info->slock, flags);
2027         set_current_state(TASK_RUNNING);
2028
2029 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
2030         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
2031 #endif
2032 }
2033
2034 /*
2035  * This routine is called by tty_hangup() when a hangup is signaled.
2036  */
2037 static void mxser_hangup(struct tty_struct *tty)
2038 {
2039         struct mxser_port *info = tty->driver_data;
2040
2041         mxser_flush_buffer(tty);
2042         tty_port_hangup(&info->port);
2043 }
2044
2045 /*
2046  * mxser_rs_break() --- routine which turns the break handling on or off
2047  */
2048 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2049 {
2050         struct mxser_port *info = tty->driver_data;
2051         unsigned long flags;
2052
2053         spin_lock_irqsave(&info->slock, flags);
2054         if (break_state == -1)
2055                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2056                         info->ioaddr + UART_LCR);
2057         else
2058                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2059                         info->ioaddr + UART_LCR);
2060         spin_unlock_irqrestore(&info->slock, flags);
2061         return 0;
2062 }
2063
2064 static void mxser_receive_chars(struct tty_struct *tty,
2065                                 struct mxser_port *port, int *status)
2066 {
2067         unsigned char ch, gdl;
2068         int ignored = 0;
2069         int cnt = 0;
2070         int recv_room;
2071         int max = 256;
2072
2073         recv_room = tty->receive_room;
2074         if (recv_room == 0 && !port->ldisc_stop_rx)
2075                 mxser_stoprx(tty);
2076         if (port->board->chip_flag != MOXA_OTHER_UART) {
2077
2078                 if (*status & UART_LSR_SPECIAL)
2079                         goto intr_old;
2080                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2081                                 (*status & MOXA_MUST_LSR_RERR))
2082                         goto intr_old;
2083                 if (*status & MOXA_MUST_LSR_RERR)
2084                         goto intr_old;
2085
2086                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2087
2088                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2089                         gdl &= MOXA_MUST_GDL_MASK;
2090                 if (gdl >= recv_room) {
2091                         if (!port->ldisc_stop_rx)
2092                                 mxser_stoprx(tty);
2093                 }
2094                 while (gdl--) {
2095                         ch = inb(port->ioaddr + UART_RX);
2096                         tty_insert_flip_char(tty, ch, 0);
2097                         cnt++;
2098                 }
2099                 goto end_intr;
2100         }
2101 intr_old:
2102
2103         do {
2104                 if (max-- < 0)
2105                         break;
2106
2107                 ch = inb(port->ioaddr + UART_RX);
2108                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2109                         outb(0x23, port->ioaddr + UART_FCR);
2110                 *status &= port->read_status_mask;
2111                 if (*status & port->ignore_status_mask) {
2112                         if (++ignored > 100)
2113                                 break;
2114                 } else {
2115                         char flag = 0;
2116                         if (*status & UART_LSR_SPECIAL) {
2117                                 if (*status & UART_LSR_BI) {
2118                                         flag = TTY_BREAK;
2119                                         port->icount.brk++;
2120
2121                                         if (port->port.flags & ASYNC_SAK)
2122                                                 do_SAK(tty);
2123                                 } else if (*status & UART_LSR_PE) {
2124                                         flag = TTY_PARITY;
2125                                         port->icount.parity++;
2126                                 } else if (*status & UART_LSR_FE) {
2127                                         flag = TTY_FRAME;
2128                                         port->icount.frame++;
2129                                 } else if (*status & UART_LSR_OE) {
2130                                         flag = TTY_OVERRUN;
2131                                         port->icount.overrun++;
2132                                 } else
2133                                         flag = TTY_BREAK;
2134                         }
2135                         tty_insert_flip_char(tty, ch, flag);
2136                         cnt++;
2137                         if (cnt >= recv_room) {
2138                                 if (!port->ldisc_stop_rx)
2139                                         mxser_stoprx(tty);
2140                                 break;
2141                         }
2142
2143                 }
2144
2145                 if (port->board->chip_flag)
2146                         break;
2147
2148                 *status = inb(port->ioaddr + UART_LSR);
2149         } while (*status & UART_LSR_DR);
2150
2151 end_intr:
2152         mxvar_log.rxcnt[tty->index] += cnt;
2153         port->mon_data.rxcnt += cnt;
2154         port->mon_data.up_rxcnt += cnt;
2155
2156         /*
2157          * We are called from an interrupt context with &port->slock
2158          * being held. Drop it temporarily in order to prevent
2159          * recursive locking.
2160          */
2161         spin_unlock(&port->slock);
2162         tty_flip_buffer_push(tty);
2163         spin_lock(&port->slock);
2164 }
2165
2166 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2167 {
2168         int count, cnt;
2169
2170         if (port->x_char) {
2171                 outb(port->x_char, port->ioaddr + UART_TX);
2172                 port->x_char = 0;
2173                 mxvar_log.txcnt[tty->index]++;
2174                 port->mon_data.txcnt++;
2175                 port->mon_data.up_txcnt++;
2176                 port->icount.tx++;
2177                 return;
2178         }
2179
2180         if (port->port.xmit_buf == NULL)
2181                 return;
2182
2183         if (port->xmit_cnt <= 0 || tty->stopped ||
2184                         (tty->hw_stopped &&
2185                         (port->type != PORT_16550A) &&
2186                         (!port->board->chip_flag))) {
2187                 port->IER &= ~UART_IER_THRI;
2188                 outb(port->IER, port->ioaddr + UART_IER);
2189                 return;
2190         }
2191
2192         cnt = port->xmit_cnt;
2193         count = port->xmit_fifo_size;
2194         do {
2195                 outb(port->port.xmit_buf[port->xmit_tail++],
2196                         port->ioaddr + UART_TX);
2197                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2198                 if (--port->xmit_cnt <= 0)
2199                         break;
2200         } while (--count > 0);
2201         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2202
2203         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2204         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2205         port->icount.tx += (cnt - port->xmit_cnt);
2206
2207         if (port->xmit_cnt < WAKEUP_CHARS)
2208                 tty_wakeup(tty);
2209
2210         if (port->xmit_cnt <= 0) {
2211                 port->IER &= ~UART_IER_THRI;
2212                 outb(port->IER, port->ioaddr + UART_IER);
2213         }
2214 }
2215
2216 /*
2217  * This is the serial driver's generic interrupt routine
2218  */
2219 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2220 {
2221         int status, iir, i;
2222         struct mxser_board *brd = NULL;
2223         struct mxser_port *port;
2224         int max, irqbits, bits, msr;
2225         unsigned int int_cnt, pass_counter = 0;
2226         int handled = IRQ_NONE;
2227         struct tty_struct *tty;
2228
2229         for (i = 0; i < MXSER_BOARDS; i++)
2230                 if (dev_id == &mxser_boards[i]) {
2231                         brd = dev_id;
2232                         break;
2233                 }
2234
2235         if (i == MXSER_BOARDS)
2236                 goto irq_stop;
2237         if (brd == NULL)
2238                 goto irq_stop;
2239         max = brd->info->nports;
2240         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2241                 irqbits = inb(brd->vector) & brd->vector_mask;
2242                 if (irqbits == brd->vector_mask)
2243                         break;
2244
2245                 handled = IRQ_HANDLED;
2246                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2247                         if (irqbits == brd->vector_mask)
2248                                 break;
2249                         if (bits & irqbits)
2250                                 continue;
2251                         port = &brd->ports[i];
2252
2253                         int_cnt = 0;
2254                         spin_lock(&port->slock);
2255                         do {
2256                                 iir = inb(port->ioaddr + UART_IIR);
2257                                 if (iir & UART_IIR_NO_INT)
2258                                         break;
2259                                 iir &= MOXA_MUST_IIR_MASK;
2260                                 tty = tty_port_tty_get(&port->port);
2261                                 if (!tty ||
2262                                                 (port->port.flags & ASYNC_CLOSING) ||
2263                                                 !(port->port.flags &
2264                                                         ASYNC_INITIALIZED)) {
2265                                         status = inb(port->ioaddr + UART_LSR);
2266                                         outb(0x27, port->ioaddr + UART_FCR);
2267                                         inb(port->ioaddr + UART_MSR);
2268                                         tty_kref_put(tty);
2269                                         break;
2270                                 }
2271
2272                                 status = inb(port->ioaddr + UART_LSR);
2273
2274                                 if (status & UART_LSR_PE)
2275                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2276                                 if (status & UART_LSR_FE)
2277                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2278                                 if (status & UART_LSR_OE)
2279                                         port->err_shadow |=
2280                                                 NPPI_NOTIFY_HW_OVERRUN;
2281                                 if (status & UART_LSR_BI)
2282                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2283
2284                                 if (port->board->chip_flag) {
2285                                         if (iir == MOXA_MUST_IIR_GDA ||
2286                                             iir == MOXA_MUST_IIR_RDA ||
2287                                             iir == MOXA_MUST_IIR_RTO ||
2288                                             iir == MOXA_MUST_IIR_LSR)
2289                                                 mxser_receive_chars(tty, port,
2290                                                                 &status);
2291
2292                                 } else {
2293                                         status &= port->read_status_mask;
2294                                         if (status & UART_LSR_DR)
2295                                                 mxser_receive_chars(tty, port,
2296                                                                 &status);
2297                                 }
2298                                 msr = inb(port->ioaddr + UART_MSR);
2299                                 if (msr & UART_MSR_ANY_DELTA)
2300                                         mxser_check_modem_status(tty, port, msr);
2301
2302                                 if (port->board->chip_flag) {
2303                                         if (iir == 0x02 && (status &
2304                                                                 UART_LSR_THRE))
2305                                                 mxser_transmit_chars(tty, port);
2306                                 } else {
2307                                         if (status & UART_LSR_THRE)
2308                                                 mxser_transmit_chars(tty, port);
2309                                 }
2310                                 tty_kref_put(tty);
2311                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2312                         spin_unlock(&port->slock);
2313                 }
2314         }
2315
2316 irq_stop:
2317         return handled;
2318 }
2319
2320 static const struct tty_operations mxser_ops = {
2321         .open = mxser_open,
2322         .close = mxser_close,
2323         .write = mxser_write,
2324         .put_char = mxser_put_char,
2325         .flush_chars = mxser_flush_chars,
2326         .write_room = mxser_write_room,
2327         .chars_in_buffer = mxser_chars_in_buffer,
2328         .flush_buffer = mxser_flush_buffer,
2329         .ioctl = mxser_ioctl,
2330         .throttle = mxser_throttle,
2331         .unthrottle = mxser_unthrottle,
2332         .set_termios = mxser_set_termios,
2333         .stop = mxser_stop,
2334         .start = mxser_start,
2335         .hangup = mxser_hangup,
2336         .break_ctl = mxser_rs_break,
2337         .wait_until_sent = mxser_wait_until_sent,
2338         .tiocmget = mxser_tiocmget,
2339         .tiocmset = mxser_tiocmset,
2340         .get_icount = mxser_get_icount,
2341 };
2342
2343 struct tty_port_operations mxser_port_ops = {
2344         .carrier_raised = mxser_carrier_raised,
2345         .dtr_rts = mxser_dtr_rts,
2346         .activate = mxser_activate,
2347         .shutdown = mxser_shutdown_port,
2348 };
2349
2350 /*
2351  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2352  */
2353
2354 static void mxser_release_ISA_res(struct mxser_board *brd)
2355 {
2356         free_irq(brd->irq, brd);
2357         release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2358         release_region(brd->vector, 1);
2359 }
2360
2361 static int __devinit mxser_initbrd(struct mxser_board *brd,
2362                 struct pci_dev *pdev)
2363 {
2364         struct mxser_port *info;
2365         unsigned int i;
2366         int retval;
2367
2368         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2369                         brd->ports[0].max_baud);
2370
2371         for (i = 0; i < brd->info->nports; i++) {
2372                 info = &brd->ports[i];
2373                 tty_port_init(&info->port);
2374                 info->port.ops = &mxser_port_ops;
2375                 info->board = brd;
2376                 info->stop_rx = 0;
2377                 info->ldisc_stop_rx = 0;
2378
2379                 /* Enhance mode enabled here */
2380                 if (brd->chip_flag != MOXA_OTHER_UART)
2381                         mxser_enable_must_enchance_mode(info->ioaddr);
2382
2383                 info->port.flags = ASYNC_SHARE_IRQ;
2384                 info->type = brd->uart_type;
2385
2386                 process_txrx_fifo(info);
2387
2388                 info->custom_divisor = info->baud_base * 16;
2389                 info->port.close_delay = 5 * HZ / 10;
2390                 info->port.closing_wait = 30 * HZ;
2391                 info->normal_termios = mxvar_sdriver->init_termios;
2392                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2393                 info->err_shadow = 0;
2394                 spin_lock_init(&info->slock);
2395
2396                 /* before set INT ISR, disable all int */
2397                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2398                         info->ioaddr + UART_IER);
2399         }
2400
2401         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2402                         brd);
2403         if (retval)
2404                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2405                         "conflict with another device.\n",
2406                         brd->info->name, brd->irq);
2407
2408         return retval;
2409 }
2410
2411 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2412 {
2413         int id, i, bits;
2414         unsigned short regs[16], irq;
2415         unsigned char scratch, scratch2;
2416
2417         brd->chip_flag = MOXA_OTHER_UART;
2418
2419         id = mxser_read_register(cap, regs);
2420         switch (id) {
2421         case C168_ASIC_ID:
2422                 brd->info = &mxser_cards[0];
2423                 break;
2424         case C104_ASIC_ID:
2425                 brd->info = &mxser_cards[1];
2426                 break;
2427         case CI104J_ASIC_ID:
2428                 brd->info = &mxser_cards[2];
2429                 break;
2430         case C102_ASIC_ID:
2431                 brd->info = &mxser_cards[5];
2432                 break;
2433         case CI132_ASIC_ID:
2434                 brd->info = &mxser_cards[6];
2435                 break;
2436         case CI134_ASIC_ID:
2437                 brd->info = &mxser_cards[7];
2438                 break;
2439         default:
2440                 return 0;
2441         }
2442
2443         irq = 0;
2444         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2445            Flag-hack checks if configuration should be read as 2-port here. */
2446         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2447                 irq = regs[9] & 0xF000;
2448                 irq = irq | (irq >> 4);
2449                 if (irq != (regs[9] & 0xFF00))
2450                         goto err_irqconflict;
2451         } else if (brd->info->nports == 4) {
2452                 irq = regs[9] & 0xF000;
2453                 irq = irq | (irq >> 4);
2454                 irq = irq | (irq >> 8);
2455                 if (irq != regs[9])
2456                         goto err_irqconflict;
2457         } else if (brd->info->nports == 8) {
2458                 irq = regs[9] & 0xF000;
2459                 irq = irq | (irq >> 4);
2460                 irq = irq | (irq >> 8);
2461                 if ((irq != regs[9]) || (irq != regs[10]))
2462                         goto err_irqconflict;
2463         }
2464
2465         if (!irq) {
2466                 printk(KERN_ERR "mxser: interrupt number unset\n");
2467                 return -EIO;
2468         }
2469         brd->irq = ((int)(irq & 0xF000) >> 12);
2470         for (i = 0; i < 8; i++)
2471                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2472         if ((regs[12] & 0x80) == 0) {
2473                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2474                 return -EIO;
2475         }
2476         brd->vector = (int)regs[11];    /* interrupt vector */
2477         if (id == 1)
2478                 brd->vector_mask = 0x00FF;
2479         else
2480                 brd->vector_mask = 0x000F;
2481         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2482                 if (regs[12] & bits) {
2483                         brd->ports[i].baud_base = 921600;
2484                         brd->ports[i].max_baud = 921600;
2485                 } else {
2486                         brd->ports[i].baud_base = 115200;
2487                         brd->ports[i].max_baud = 115200;
2488                 }
2489         }
2490         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2491         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2492         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2493         outb(scratch2, cap + UART_LCR);
2494         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2495         scratch = inb(cap + UART_IIR);
2496
2497         if (scratch & 0xC0)
2498                 brd->uart_type = PORT_16550A;
2499         else
2500                 brd->uart_type = PORT_16450;
2501         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2502                         "mxser(IO)")) {
2503                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2504                                 "0x%.8lx-0x%.8lx\n",
2505                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2506                                 8 * brd->info->nports - 1);
2507                 return -EIO;
2508         }
2509         if (!request_region(brd->vector, 1, "mxser(vector)")) {
2510                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2511                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2512                                 "0x%.8lx-0x%.8lx\n",
2513                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2514                                 8 * brd->info->nports - 1);
2515                 return -EIO;
2516         }
2517         return brd->info->nports;
2518
2519 err_irqconflict:
2520         printk(KERN_ERR "mxser: invalid interrupt number\n");
2521         return -EIO;
2522 }
2523
2524 static int __devinit mxser_probe(struct pci_dev *pdev,
2525                 const struct pci_device_id *ent)
2526 {
2527 #ifdef CONFIG_PCI
2528         struct mxser_board *brd;
2529         unsigned int i, j;
2530         unsigned long ioaddress;
2531         int retval = -EINVAL;
2532
2533         for (i = 0; i < MXSER_BOARDS; i++)
2534                 if (mxser_boards[i].info == NULL)
2535                         break;
2536
2537         if (i >= MXSER_BOARDS) {
2538                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2539                                 "not configured\n", MXSER_BOARDS);
2540                 goto err;
2541         }
2542
2543         brd = &mxser_boards[i];
2544         brd->idx = i * MXSER_PORTS_PER_BOARD;
2545         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2546                 mxser_cards[ent->driver_data].name,
2547                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2548
2549         retval = pci_enable_device(pdev);
2550         if (retval) {
2551                 dev_err(&pdev->dev, "PCI enable failed\n");
2552                 goto err;
2553         }
2554
2555         /* io address */
2556         ioaddress = pci_resource_start(pdev, 2);
2557         retval = pci_request_region(pdev, 2, "mxser(IO)");
2558         if (retval)
2559                 goto err_dis;
2560
2561         brd->info = &mxser_cards[ent->driver_data];
2562         for (i = 0; i < brd->info->nports; i++)
2563                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2564
2565         /* vector */
2566         ioaddress = pci_resource_start(pdev, 3);
2567         retval = pci_request_region(pdev, 3, "mxser(vector)");
2568         if (retval)
2569                 goto err_zero;
2570         brd->vector = ioaddress;
2571
2572         /* irq */
2573         brd->irq = pdev->irq;
2574
2575         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2576         brd->uart_type = PORT_16550A;
2577         brd->vector_mask = 0;
2578
2579         for (i = 0; i < brd->info->nports; i++) {
2580                 for (j = 0; j < UART_INFO_NUM; j++) {
2581                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2582                                 brd->ports[i].max_baud =
2583                                         Gpci_uart_info[j].max_baud;
2584
2585                                 /* exception....CP-102 */
2586                                 if (brd->info->flags & MXSER_HIGHBAUD)
2587                                         brd->ports[i].max_baud = 921600;
2588                                 break;
2589                         }
2590                 }
2591         }
2592
2593         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2594                 for (i = 0; i < brd->info->nports; i++) {
2595                         if (i < 4)
2596                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2597                         else
2598                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2599                 }
2600                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2601                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2602         }
2603
2604         for (i = 0; i < brd->info->nports; i++) {
2605                 brd->vector_mask |= (1 << i);
2606                 brd->ports[i].baud_base = 921600;
2607         }
2608
2609         /* mxser_initbrd will hook ISR. */
2610         retval = mxser_initbrd(brd, pdev);
2611         if (retval)
2612                 goto err_rel3;
2613
2614         for (i = 0; i < brd->info->nports; i++)
2615                 tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
2616
2617         pci_set_drvdata(pdev, brd);
2618
2619         return 0;
2620 err_rel3:
2621         pci_release_region(pdev, 3);
2622 err_zero:
2623         brd->info = NULL;
2624         pci_release_region(pdev, 2);
2625 err_dis:
2626         pci_disable_device(pdev);
2627 err:
2628         return retval;
2629 #else
2630         return -ENODEV;
2631 #endif
2632 }
2633
2634 static void __devexit mxser_remove(struct pci_dev *pdev)
2635 {
2636 #ifdef CONFIG_PCI
2637         struct mxser_board *brd = pci_get_drvdata(pdev);
2638         unsigned int i;
2639
2640         for (i = 0; i < brd->info->nports; i++)
2641                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2642
2643         free_irq(pdev->irq, brd);
2644         pci_release_region(pdev, 2);
2645         pci_release_region(pdev, 3);
2646         pci_disable_device(pdev);
2647         brd->info = NULL;
2648 #endif
2649 }
2650
2651 static struct pci_driver mxser_driver = {
2652         .name = "mxser",
2653         .id_table = mxser_pcibrds,
2654         .probe = mxser_probe,
2655         .remove = __devexit_p(mxser_remove)
2656 };
2657
2658 static int __init mxser_module_init(void)
2659 {
2660         struct mxser_board *brd;
2661         unsigned int b, i, m;
2662         int retval;
2663
2664         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2665         if (!mxvar_sdriver)
2666                 return -ENOMEM;
2667
2668         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2669                 MXSER_VERSION);
2670
2671         /* Initialize the tty_driver structure */
2672         mxvar_sdriver->owner = THIS_MODULE;
2673         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
2674         mxvar_sdriver->name = "ttyMI";
2675         mxvar_sdriver->major = ttymajor;
2676         mxvar_sdriver->minor_start = 0;
2677         mxvar_sdriver->num = MXSER_PORTS + 1;
2678         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2679         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2680         mxvar_sdriver->init_termios = tty_std_termios;
2681         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2682         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2683         tty_set_operations(mxvar_sdriver, &mxser_ops);
2684
2685         retval = tty_register_driver(mxvar_sdriver);
2686         if (retval) {
2687                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2688                                 "tty driver !\n");
2689                 goto err_put;
2690         }
2691
2692         /* Start finding ISA boards here */
2693         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2694                 if (!ioaddr[b])
2695                         continue;
2696
2697                 brd = &mxser_boards[m];
2698                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2699                 if (retval <= 0) {
2700                         brd->info = NULL;
2701                         continue;
2702                 }
2703
2704                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2705                                 brd->info->name, ioaddr[b]);
2706
2707                 /* mxser_initbrd will hook ISR. */
2708                 if (mxser_initbrd(brd, NULL) < 0) {
2709                         brd->info = NULL;
2710                         continue;
2711                 }
2712
2713                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2714                 for (i = 0; i < brd->info->nports; i++)
2715                         tty_register_device(mxvar_sdriver, brd->idx + i, NULL);
2716
2717                 m++;
2718         }
2719
2720         retval = pci_register_driver(&mxser_driver);
2721         if (retval) {
2722                 printk(KERN_ERR "mxser: can't register pci driver\n");
2723                 if (!m) {
2724                         retval = -ENODEV;
2725                         goto err_unr;
2726                 } /* else: we have some ISA cards under control */
2727         }
2728
2729         return 0;
2730 err_unr:
2731         tty_unregister_driver(mxvar_sdriver);
2732 err_put:
2733         put_tty_driver(mxvar_sdriver);
2734         return retval;
2735 }
2736
2737 static void __exit mxser_module_exit(void)
2738 {
2739         unsigned int i, j;
2740
2741         pci_unregister_driver(&mxser_driver);
2742
2743         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2744                 if (mxser_boards[i].info != NULL)
2745                         for (j = 0; j < mxser_boards[i].info->nports; j++)
2746                                 tty_unregister_device(mxvar_sdriver,
2747                                                 mxser_boards[i].idx + j);
2748         tty_unregister_driver(mxvar_sdriver);
2749         put_tty_driver(mxvar_sdriver);
2750
2751         for (i = 0; i < MXSER_BOARDS; i++)
2752                 if (mxser_boards[i].info != NULL)
2753                         mxser_release_ISA_res(&mxser_boards[i]);
2754 }
2755
2756 module_init(mxser_module_init);
2757 module_exit(mxser_module_exit);