drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2001  Moxa Technologies (support@moxa.com.tw).
   5  *
   6  *      This code is loosely based on the Linux serial driver, written by
   7  *      Linus Torvalds, Theodore T'so and others.
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  *      This program is distributed in the hope that it will be useful,
  15  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *      GNU General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License
  20  *      along with this program; if not, write to the Free Software
  21  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  *      Original release        10/26/00
  24  *
  25  *      02/06/01        Support MOXA Industio family boards.
  26  *      02/06/01        Support TIOCGICOUNT.
  27  *      02/06/01        Fix the problem for connecting to serial mouse.
  28  *      02/06/01        Fix the problem for H/W flow control.
  29  *      02/06/01        Fix the compling warning when CONFIG_PCI
  30  *                      don't be defined.
  31  *
  32  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  33  *      <alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
  34  *      - Fixed x86_64 cleanness
  35  *      - Fixed sleep with spinlock held in mxser_send_break
  36  */
  37
  38
  39 #include <linux/module.h>
  40 #include <linux/autoconf.h>
  41 #include <linux/errno.h>
  42 #include <linux/signal.h>
  43 #include <linux/sched.h>
  44 #include <linux/timer.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/tty.h>
  47 #include <linux/tty_flip.h>
  48 #include <linux/serial.h>
  49 #include <linux/serial_reg.h>
  50 #include <linux/major.h>
  51 #include <linux/string.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/ptrace.h>
  54 #include <linux/gfp.h>
  55 #include <linux/ioport.h>
  56 #include <linux/mm.h>
  57 #include <linux/smp_lock.h>
  58 #include <linux/delay.h>
  59 #include <linux/pci.h>
  60
  61 #include <asm/system.h>
  62 #include <asm/io.h>
  63 #include <asm/irq.h>
  64 #include <asm/bitops.h>
  65 #include <asm/uaccess.h>
  66
  67 #include "mxser.h"
  68
  69 #define MXSER_VERSION   "1.8"
  70 #define MXSERMAJOR       174
  71 #define MXSERCUMAJOR     175
  72
  73 #define MXSER_EVENT_TXLOW       1
  74 #define MXSER_EVENT_HANGUP      2
  75
  76 #define MXSER_BOARDS            4       /* Max. boards */
  77 #define MXSER_PORTS             32      /* Max. ports */
  78 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  79 #define MXSER_ISR_PASS_LIMIT    256
  80
  81 #define MXSER_ERR_IOADDR        -1
  82 #define MXSER_ERR_IRQ           -2
  83 #define MXSER_ERR_IRQ_CONFLIT   -3
  84 #define MXSER_ERR_VECTOR        -4
  85
  86 #define SERIAL_TYPE_NORMAL      1
  87 #define SERIAL_TYPE_CALLOUT     2
  88
  89 #define WAKEUP_CHARS            256
  90
  91 #define UART_MCR_AFE            0x20
  92 #define UART_LSR_SPECIAL        0x1E
  93
  94 #define RELEVANT_IFLAG(iflag)   (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|\
  95                                           IXON|IXOFF))
  96
  97 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)
  98
  99 #define C168_ASIC_ID    1
 100 #define C104_ASIC_ID    2
 101 #define C102_ASIC_ID    0xB
 102 #define CI132_ASIC_ID   4
 103 #define CI134_ASIC_ID   3
 104 #define CI104J_ASIC_ID  5
 105
 106 enum {
 107         MXSER_BOARD_C168_ISA = 1,
 108         MXSER_BOARD_C104_ISA,
 109         MXSER_BOARD_CI104J,
 110         MXSER_BOARD_C168_PCI,
 111         MXSER_BOARD_C104_PCI,
 112         MXSER_BOARD_C102_ISA,
 113         MXSER_BOARD_CI132,
 114         MXSER_BOARD_CI134,
 115         MXSER_BOARD_CP132,
 116         MXSER_BOARD_CP114,
 117         MXSER_BOARD_CT114,
 118         MXSER_BOARD_CP102,
 119         MXSER_BOARD_CP104U,
 120         MXSER_BOARD_CP168U,
 121         MXSER_BOARD_CP132U,
 122         MXSER_BOARD_CP134U,
 123         MXSER_BOARD_CP104JU,
 124         MXSER_BOARD_RC7000,
 125         MXSER_BOARD_CP118U,
 126         MXSER_BOARD_CP102UL,
 127         MXSER_BOARD_CP102U,
 128 };
 129
 130 static char *mxser_brdname[] = {
 131         "C168 series",
 132         "C104 series",
 133         "CI-104J series",
 134         "C168H/PCI series",
 135         "C104H/PCI series",
 136         "C102 series",
 137         "CI-132 series",
 138         "CI-134 series",
 139         "CP-132 series",
 140         "CP-114 series",
 141         "CT-114 series",
 142         "CP-102 series",
 143         "CP-104U series",
 144         "CP-168U series",
 145         "CP-132U series",
 146         "CP-134U series",
 147         "CP-104JU series",
 148         "Moxa UC7000 Serial",
 149         "CP-118U series",
 150         "CP-102UL series",
 151         "CP-102U series",
 152 };
 153
 154 static int mxser_numports[] = {
 155         8,                      /* C168-ISA */
 156         4,                      /* C104-ISA */
 157         4,                      /* CI104J */
 158         8,                      /* C168-PCI */
 159         4,                      /* C104-PCI */
 160         2,                      /* C102-ISA */
 161         2,                      /* CI132 */
 162         4,                      /* CI134 */
 163         2,                      /* CP132 */
 164         4,                      /* CP114 */
 165         4,                      /* CT114 */
 166         2,                      /* CP102 */
 167         4,                      /* CP104U */
 168         8,                      /* CP168U */
 169         2,                      /* CP132U */
 170         4,                      /* CP134U */
 171         4,                      /* CP104JU */
 172         8,                      /* RC7000 */
 173         8,                      /* CP118U */
 174         2,                      /* CP102UL */
 175         2,                      /* CP102U */
 176 };
 177
 178 #define UART_TYPE_NUM   2
 179
 180 static const unsigned int Gmoxa_uart_id[UART_TYPE_NUM] = {
 181         MOXA_MUST_MU150_HWID,
 182         MOXA_MUST_MU860_HWID
 183 };
 184
 185 /* This is only for PCI */
 186 #define UART_INFO_NUM   3
 187 struct mxpciuart_info {
 188         int type;
 189         int tx_fifo;
 190         int rx_fifo;
 191         int xmit_fifo_size;
 192         int rx_high_water;
 193         int rx_trigger;
 194         int rx_low_water;
 195         long max_baud;
 196 };
 197
 198 static const struct mxpciuart_info Gpci_uart_info[UART_INFO_NUM] = {
 199         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 200         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 201         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 202 };
 203
 204
 205 #ifdef CONFIG_PCI
 206
 207 static struct pci_device_id mxser_pcibrds[] = {
 208         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C168, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_C168_PCI},
 209         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C104, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_C104_PCI},
 210         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP132},
 211         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP114},
 212         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CT114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CT114},
 213         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102},
 214         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP104U},
 215         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP168U},
 216         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP132U},
 217         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP134U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP134U},
 218         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104JU, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP104JU},
 219         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_RC7000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_RC7000},
 220         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP118U},
 221         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102UL, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102UL},
 222         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102U},
 223         {0}
 224 };
 225
 226 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 227
 228
 229 #endif
 230
 231 typedef struct _moxa_pci_info {
 232         unsigned short busNum;
 233         unsigned short devNum;
 234         struct pci_dev *pdev;   /* add by Victor Yu. 06-23-2003 */
 235 } moxa_pci_info;
 236
 237 static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 238 static int ttymajor = MXSERMAJOR;
 239 static int calloutmajor = MXSERCUMAJOR;
 240 static int verbose = 0;
 241
 242 /* Variables for insmod */
 243
 244 MODULE_AUTHOR("Casper Yang");
 245 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 246 module_param_array(ioaddr, int, NULL, 0);
 247 module_param(ttymajor, int, 0);
 248 module_param(calloutmajor, int, 0);
 249 module_param(verbose, bool, 0);
 250 MODULE_LICENSE("GPL");
 251
 252 struct mxser_log {
 253         int tick;
 254         unsigned long rxcnt[MXSER_PORTS];
 255         unsigned long txcnt[MXSER_PORTS];
 256 };
 257
 258
 259 struct mxser_mon {
 260         unsigned long rxcnt;
 261         unsigned long txcnt;
 262         unsigned long up_rxcnt;
 263         unsigned long up_txcnt;
 264         int modem_status;
 265         unsigned char hold_reason;
 266 };
 267
 268 struct mxser_mon_ext {
 269         unsigned long rx_cnt[32];
 270         unsigned long tx_cnt[32];
 271         unsigned long up_rxcnt[32];
 272         unsigned long up_txcnt[32];
 273         int modem_status[32];
 274
 275         long baudrate[32];
 276         int databits[32];
 277         int stopbits[32];
 278         int parity[32];
 279         int flowctrl[32];
 280         int fifo[32];
 281         int iftype[32];
 282 };
 283
 284 struct mxser_hwconf {
 285         int board_type;
 286         int ports;
 287         int irq;
 288         int vector;
 289         int vector_mask;
 290         int uart_type;
 291         int ioaddr[MXSER_PORTS_PER_BOARD];
 292         int baud_base[MXSER_PORTS_PER_BOARD];
 293         moxa_pci_info pciInfo;
 294         int IsMoxaMustChipFlag; /* add by Victor Yu. 08-30-2002 */
 295         int MaxCanSetBaudRate[MXSER_PORTS_PER_BOARD];   /* add by Victor Yu. 09-04-2002 */
 296         int opmode_ioaddr[MXSER_PORTS_PER_BOARD];       /* add by Victor Yu. 01-05-2004 */
 297 };
 298
 299 struct mxser_struct {
 300         int port;
 301         int base;               /* port base address */
 302         int irq;                /* port using irq no. */
 303         int vector;             /* port irq vector */
 304         int vectormask;         /* port vector mask */
 305         int rx_high_water;
 306         int rx_trigger;         /* Rx fifo trigger level */
 307         int rx_low_water;
 308         int baud_base;          /* max. speed */
 309         int flags;              /* defined in tty.h */
 310         int type;               /* UART type */
 311         struct tty_struct *tty;
 312         int read_status_mask;
 313         int ignore_status_mask;
 314         int xmit_fifo_size;
 315         int custom_divisor;
 316         int x_char;             /* xon/xoff character */
 317         int close_delay;
 318         unsigned short closing_wait;
 319         int IER;                /* Interrupt Enable Register */
 320         int MCR;                /* Modem control register */
 321         unsigned long event;
 322         int count;              /* # of fd on device */
 323         int blocked_open;       /* # of blocked opens */
 324         long session;           /* Session of opening process */
 325         long pgrp;              /* pgrp of opening process */
 326         unsigned char *xmit_buf;
 327         int xmit_head;
 328         int xmit_tail;
 329         int xmit_cnt;
 330         struct work_struct tqueue;
 331         struct ktermios normal_termios;
 332         struct ktermios callout_termios;
 333         wait_queue_head_t open_wait;
 334         wait_queue_head_t close_wait;
 335         wait_queue_head_t delta_msr_wait;
 336         struct async_icount icount;     /* kernel counters for the 4 input interrupts */
 337         int timeout;
 338         int IsMoxaMustChipFlag; /* add by Victor Yu. 08-30-2002 */
 339         int MaxCanSetBaudRate;  /* add by Victor Yu. 09-04-2002 */
 340         int opmode_ioaddr;      /* add by Victor Yu. 01-05-2004 */
 341         unsigned char stop_rx;
 342         unsigned char ldisc_stop_rx;
 343         long realbaud;
 344         struct mxser_mon mon_data;
 345         unsigned char err_shadow;
 346         spinlock_t slock;
 347 };
 348
 349 struct mxser_mstatus {
 350         tcflag_t cflag;
 351         int cts;
 352         int dsr;
 353         int ri;
 354         int dcd;
 355 };
 356
 357 static struct mxser_mstatus GMStatus[MXSER_PORTS];
 358
 359 static int mxserBoardCAP[MXSER_BOARDS] = {
 360         0, 0, 0, 0
 361         /*  0x180, 0x280, 0x200, 0x320 */
 362 };
 363
 364 static struct tty_driver *mxvar_sdriver;
 365 static struct mxser_struct mxvar_table[MXSER_PORTS];
 366 static struct tty_struct *mxvar_tty[MXSER_PORTS + 1];
 367 static struct ktermios *mxvar_termios[MXSER_PORTS + 1];
 368 static struct ktermios *mxvar_termios_locked[MXSER_PORTS + 1];
 369 static struct mxser_log mxvar_log;
 370 static int mxvar_diagflag;
 371 static unsigned char mxser_msr[MXSER_PORTS + 1];
 372 static struct mxser_mon_ext mon_data_ext;
 373 static int mxser_set_baud_method[MXSER_PORTS + 1];
 374 static spinlock_t gm_lock;
 375
 376 /*
 377  * This is used to figure out the divisor speeds and the timeouts
 378  */
 379
 380 static struct mxser_hwconf mxsercfg[MXSER_BOARDS];
 381
 382 /*
 383  * static functions:
 384  */
 385
 386 static void mxser_getcfg(int board, struct mxser_hwconf *hwconf);
 387 static int mxser_init(void);
 388
 389 /* static void   mxser_poll(unsigned long); */
 390 static int mxser_get_ISA_conf(int, struct mxser_hwconf *);
 391 static int mxser_get_PCI_conf(int, int, int, struct mxser_hwconf *);
 392 static void mxser_do_softint(struct work_struct *);
 393 static int mxser_open(struct tty_struct *, struct file *);
 394 static void mxser_close(struct tty_struct *, struct file *);
 395 static int mxser_write(struct tty_struct *, const unsigned char *, int);
 396 static int mxser_write_room(struct tty_struct *);
 397 static void mxser_flush_buffer(struct tty_struct *);
 398 static int mxser_chars_in_buffer(struct tty_struct *);
 399 static void mxser_flush_chars(struct tty_struct *);
 400 static void mxser_put_char(struct tty_struct *, unsigned char);
 401 static int mxser_ioctl(struct tty_struct *, struct file *, uint, ulong);
 402 static int mxser_ioctl_special(unsigned int, void __user *);
 403 static void mxser_throttle(struct tty_struct *);
 404 static void mxser_unthrottle(struct tty_struct *);
 405 static void mxser_set_termios(struct tty_struct *, struct ktermios *);
 406 static void mxser_stop(struct tty_struct *);
 407 static void mxser_start(struct tty_struct *);
 408 static void mxser_hangup(struct tty_struct *);
 409 static void mxser_rs_break(struct tty_struct *, int);
 410 static irqreturn_t mxser_interrupt(int, void *);
 411 static void mxser_receive_chars(struct mxser_struct *, int *);
 412 static void mxser_transmit_chars(struct mxser_struct *);
 413 static void mxser_check_modem_status(struct mxser_struct *, int);
 414 static int mxser_block_til_ready(struct tty_struct *, struct file *, struct mxser_struct *);
 415 static int mxser_startup(struct mxser_struct *);
 416 static void mxser_shutdown(struct mxser_struct *);
 417 static int mxser_change_speed(struct mxser_struct *, struct ktermios *old_termios);
 418 static int mxser_get_serial_info(struct mxser_struct *, struct serial_struct __user *);
 419 static int mxser_set_serial_info(struct mxser_struct *, struct serial_struct __user *);
 420 static int mxser_get_lsr_info(struct mxser_struct *, unsigned int __user *);
 421 static void mxser_send_break(struct mxser_struct *, int);
 422 static int mxser_tiocmget(struct tty_struct *, struct file *);
 423 static int mxser_tiocmset(struct tty_struct *, struct file *, unsigned int, unsigned int);
 424 static int mxser_set_baud(struct mxser_struct *info, long newspd);
 425 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout);
 426
 427 static void mxser_startrx(struct tty_struct *tty);
 428 static void mxser_stoprx(struct tty_struct *tty);
 429
 430
 431 static int CheckIsMoxaMust(int io)
 432 {
 433         u8 oldmcr, hwid;
 434         int i;
 435
 436         outb(0, io + UART_LCR);
 437         DISABLE_MOXA_MUST_ENCHANCE_MODE(io);
 438         oldmcr = inb(io + UART_MCR);
 439         outb(0, io + UART_MCR);
 440         SET_MOXA_MUST_XON1_VALUE(io, 0x11);
 441         if ((hwid = inb(io + UART_MCR)) != 0) {
 442                 outb(oldmcr, io + UART_MCR);
 443                 return MOXA_OTHER_UART;
 444         }
 445
 446         GET_MOXA_MUST_HARDWARE_ID(io, &hwid);
 447         for (i = 0; i < UART_TYPE_NUM; i++) {
 448                 if (hwid == Gmoxa_uart_id[i])
 449                         return (int)hwid;
 450         }
 451         return MOXA_OTHER_UART;
 452 }
 453
 454 /* above is modified by Victor Yu. 08-15-2002 */
 455
 456 static const struct tty_operations mxser_ops = {
 457         .open = mxser_open,
 458         .close = mxser_close,
 459         .write = mxser_write,
 460         .put_char = mxser_put_char,
 461         .flush_chars = mxser_flush_chars,
 462         .write_room = mxser_write_room,
 463         .chars_in_buffer = mxser_chars_in_buffer,
 464         .flush_buffer = mxser_flush_buffer,
 465         .ioctl = mxser_ioctl,
 466         .throttle = mxser_throttle,
 467         .unthrottle = mxser_unthrottle,
 468         .set_termios = mxser_set_termios,
 469         .stop = mxser_stop,
 470         .start = mxser_start,
 471         .hangup = mxser_hangup,
 472         .break_ctl = mxser_rs_break,
 473         .wait_until_sent = mxser_wait_until_sent,
 474         .tiocmget = mxser_tiocmget,
 475         .tiocmset = mxser_tiocmset,
 476 };
 477
 478 /*
 479  * The MOXA Smartio/Industio serial driver boot-time initialization code!
 480  */
 481
 482 static int __init mxser_module_init(void)
 483 {
 484         int ret;
 485
 486         if (verbose)
 487                 printk(KERN_DEBUG "Loading module mxser ...\n");
 488         ret = mxser_init();
 489         if (verbose)
 490                 printk(KERN_DEBUG "Done.\n");
 491         return ret;
 492 }
 493
 494 static void __exit mxser_module_exit(void)
 495 {
 496         int i, err;
 497
 498         if (verbose)
 499                 printk(KERN_DEBUG "Unloading module mxser ...\n");
 500
 501         err = tty_unregister_driver(mxvar_sdriver);
 502         if (!err)
 503                 put_tty_driver(mxvar_sdriver);
 504         else
 505                 printk(KERN_ERR "Couldn't unregister MOXA Smartio/Industio family serial driver\n");
 506
 507         for (i = 0; i < MXSER_BOARDS; i++) {
 508                 struct pci_dev *pdev;
 509
 510                 if (mxsercfg[i].board_type == -1)
 511                         continue;
 512                 else {
 513                         pdev = mxsercfg[i].pciInfo.pdev;
 514                         free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]);
 515                         if (pdev != NULL) {     /* PCI */
 516                                 release_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2));
 517                                 release_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3));
 518                                 pci_dev_put(pdev);
 519                         } else {
 520                                 release_region(mxsercfg[i].ioaddr[0], 8 * mxsercfg[i].ports);
 521                                 release_region(mxsercfg[i].vector, 1);
 522                         }
 523                 }
 524         }
 525         if (verbose)
 526                 printk(KERN_DEBUG "Done.\n");
 527 }
 528
 529 static void process_txrx_fifo(struct mxser_struct *info)
 530 {
 531         int i;
 532
 533         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 534                 info->rx_trigger = 1;
 535                 info->rx_high_water = 1;
 536                 info->rx_low_water = 1;
 537                 info->xmit_fifo_size = 1;
 538         } else {
 539                 for (i = 0; i < UART_INFO_NUM; i++) {
 540                         if (info->IsMoxaMustChipFlag == Gpci_uart_info[i].type) {
 541                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 542                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 543                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 544                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 545                                 break;
 546                         }
 547                 }
 548         }
 549 }
 550
 551 static int mxser_initbrd(int board, struct mxser_hwconf *hwconf)
 552 {
 553         struct mxser_struct *info;
 554         int retval;
 555         int i, n;
 556
 557         n = board * MXSER_PORTS_PER_BOARD;
 558         info = &mxvar_table[n];
 559         /*if (verbose) */  {
 560                 printk(KERN_DEBUG "        ttyMI%d - ttyMI%d ",
 561                         n, n + hwconf->ports - 1);
 562                 printk(" max. baud rate = %d bps.\n",
 563                         hwconf->MaxCanSetBaudRate[0]);
 564         }
 565
 566         for (i = 0; i < hwconf->ports; i++, n++, info++) {
 567                 info->port = n;
 568                 info->base = hwconf->ioaddr[i];
 569                 info->irq = hwconf->irq;
 570                 info->vector = hwconf->vector;
 571                 info->vectormask = hwconf->vector_mask;
 572                 info->opmode_ioaddr = hwconf->opmode_ioaddr[i]; /* add by Victor Yu. 01-05-2004 */
 573                 info->stop_rx = 0;
 574                 info->ldisc_stop_rx = 0;
 575
 576                 info->IsMoxaMustChipFlag = hwconf->IsMoxaMustChipFlag;
 577                 /* Enhance mode enabled here */
 578                 if (info->IsMoxaMustChipFlag != MOXA_OTHER_UART) {
 579                         ENABLE_MOXA_MUST_ENCHANCE_MODE(info->base);
 580                 }
 581
 582                 info->flags = ASYNC_SHARE_IRQ;
 583                 info->type = hwconf->uart_type;
 584                 info->baud_base = hwconf->baud_base[i];
 585
 586                 info->MaxCanSetBaudRate = hwconf->MaxCanSetBaudRate[i];
 587
 588                 process_txrx_fifo(info);
 589
 590
 591                 info->custom_divisor = hwconf->baud_base[i] * 16;
 592                 info->close_delay = 5 * HZ / 10;
 593                 info->closing_wait = 30 * HZ;
 594                 INIT_WORK(&info->tqueue, mxser_do_softint);
 595                 info->normal_termios = mxvar_sdriver->init_termios;
 596                 init_waitqueue_head(&info->open_wait);
 597                 init_waitqueue_head(&info->close_wait);
 598                 init_waitqueue_head(&info->delta_msr_wait);
 599                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
 600                 info->err_shadow = 0;
 601                 spin_lock_init(&info->slock);
 602         }
 603         /*
 604          * Allocate the IRQ if necessary
 605          */
 606
 607
 608         /* before set INT ISR, disable all int */
 609         for (i = 0; i < hwconf->ports; i++) {
 610                 outb(inb(hwconf->ioaddr[i] + UART_IER) & 0xf0,
 611                         hwconf->ioaddr[i] + UART_IER);
 612         }
 613
 614         n = board * MXSER_PORTS_PER_BOARD;
 615         info = &mxvar_table[n];
 616
 617         retval = request_irq(hwconf->irq, mxser_interrupt, IRQ_T(info),
 618                                 "mxser", info);
 619         if (retval) {
 620                 printk(KERN_ERR "Board %d: %s",
 621                         board, mxser_brdname[hwconf->board_type - 1]);
 622                 printk("  Request irq failed, IRQ (%d) may conflict with"
 623                         " another device.\n", info->irq);
 624                 return retval;
 625         }
 626         return 0;
 627 }
 628
 629 static void mxser_getcfg(int board, struct mxser_hwconf *hwconf)
 630 {
 631         mxsercfg[board] = *hwconf;
 632 }
 633
 634 #ifdef CONFIG_PCI
 635 static int mxser_get_PCI_conf(int busnum, int devnum, int board_type, struct mxser_hwconf *hwconf)
 636 {
 637         int i, j;
 638         /* unsigned int val; */
 639         unsigned int ioaddress;
 640         struct pci_dev *pdev = hwconf->pciInfo.pdev;
 641
 642         /* io address */
 643         hwconf->board_type = board_type;
 644         hwconf->ports = mxser_numports[board_type - 1];
 645         ioaddress = pci_resource_start(pdev, 2);
 646         request_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2),
 647                         "mxser(IO)");
 648
 649         for (i = 0; i < hwconf->ports; i++)
 650                 hwconf->ioaddr[i] = ioaddress + 8 * i;
 651
 652         /* vector */
 653         ioaddress = pci_resource_start(pdev, 3);
 654         request_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3),
 655                         "mxser(vector)");
 656         hwconf->vector = ioaddress;
 657
 658         /* irq */
 659         hwconf->irq = hwconf->pciInfo.pdev->irq;
 660
 661         hwconf->IsMoxaMustChipFlag = CheckIsMoxaMust(hwconf->ioaddr[0]);
 662         hwconf->uart_type = PORT_16550A;
 663         hwconf->vector_mask = 0;
 664
 665
 666         for (i = 0; i < hwconf->ports; i++) {
 667                 for (j = 0; j < UART_INFO_NUM; j++) {
 668                         if (Gpci_uart_info[j].type == hwconf->IsMoxaMustChipFlag) {
 669                                 hwconf->MaxCanSetBaudRate[i] = Gpci_uart_info[j].max_baud;
 670
 671                                 /* exception....CP-102 */
 672                                 if (board_type == MXSER_BOARD_CP102)
 673                                         hwconf->MaxCanSetBaudRate[i] = 921600;
 674                                 break;
 675                         }
 676                 }
 677         }
 678
 679         if (hwconf->IsMoxaMustChipFlag == MOXA_MUST_MU860_HWID) {
 680                 for (i = 0; i < hwconf->ports; i++) {
 681                         if (i < 4)
 682                                 hwconf->opmode_ioaddr[i] = ioaddress + 4;
 683                         else
 684                                 hwconf->opmode_ioaddr[i] = ioaddress + 0x0c;
 685                 }
 686                 outb(0, ioaddress + 4); /* default set to RS232 mode */
 687                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
 688         }
 689
 690         for (i = 0; i < hwconf->ports; i++) {
 691                 hwconf->vector_mask |= (1 << i);
 692                 hwconf->baud_base[i] = 921600;
 693         }
 694         return 0;
 695 }
 696 #endif
 697
 698 static int mxser_init(void)
 699 {
 700         int i, m, retval, b, n;
 701         struct pci_dev *pdev = NULL;
 702         int index;
 703         unsigned char busnum, devnum;
 704         struct mxser_hwconf hwconf;
 705
 706         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
 707         if (!mxvar_sdriver)
 708                 return -ENOMEM;
 709         spin_lock_init(&gm_lock);
 710
 711         for (i = 0; i < MXSER_BOARDS; i++) {
 712                 mxsercfg[i].board_type = -1;
 713         }
 714
 715         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
 716                 MXSER_VERSION);
 717
 718         /* Initialize the tty_driver structure */
 719         memset(mxvar_sdriver, 0, sizeof(struct tty_driver));
 720         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
 721         mxvar_sdriver->name = "ttyMI";
 722         mxvar_sdriver->major = ttymajor;
 723         mxvar_sdriver->minor_start = 0;
 724         mxvar_sdriver->num = MXSER_PORTS + 1;
 725         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
 726         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
 727         mxvar_sdriver->init_termios = tty_std_termios;
 728         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
 729         mxvar_sdriver->init_termios.c_ispeed = 9600;
 730         mxvar_sdriver->init_termios.c_ospeed = 9600;
 731         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW;
 732         tty_set_operations(mxvar_sdriver, &mxser_ops);
 733         mxvar_sdriver->ttys = mxvar_tty;
 734         mxvar_sdriver->termios = mxvar_termios;
 735         mxvar_sdriver->termios_locked = mxvar_termios_locked;
 736
 737         mxvar_diagflag = 0;
 738         memset(mxvar_table, 0, MXSER_PORTS * sizeof(struct mxser_struct));
 739         memset(&mxvar_log, 0, sizeof(struct mxser_log));
 740
 741         memset(&mxser_msr, 0, sizeof(unsigned char) * (MXSER_PORTS + 1));
 742         memset(&mon_data_ext, 0, sizeof(struct mxser_mon_ext));
 743         memset(&mxser_set_baud_method, 0, sizeof(int) * (MXSER_PORTS + 1));
 744         memset(&hwconf, 0, sizeof(struct mxser_hwconf));
 745
 746         m = 0;
 747         /* Start finding ISA boards here */
 748         for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
 749                 int cap;
 750
 751                 if (!(cap = mxserBoardCAP[b]))
 752                         continue;
 753
 754                 retval = mxser_get_ISA_conf(cap, &hwconf);
 755
 756                 if (retval != 0)
 757                         printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n",
 758                                 mxser_brdname[hwconf.board_type - 1], ioaddr[b]);
 759
 760                 if (retval <= 0) {
 761                         if (retval == MXSER_ERR_IRQ)
 762                                 printk(KERN_ERR "Invalid interrupt number, "
 763                                         "board not configured\n");
 764                         else if (retval == MXSER_ERR_IRQ_CONFLIT)
 765                                 printk(KERN_ERR "Invalid interrupt number, "
 766                                         "board not configured\n");
 767                         else if (retval == MXSER_ERR_VECTOR)
 768                                 printk(KERN_ERR "Invalid interrupt vector, "
 769                                         "board not configured\n");
 770                         else if (retval == MXSER_ERR_IOADDR)
 771                                 printk(KERN_ERR "Invalid I/O address, "
 772                                         "board not configured\n");
 773
 774                         continue;
 775                 }
 776
 777                 hwconf.pciInfo.busNum = 0;
 778                 hwconf.pciInfo.devNum = 0;
 779                 hwconf.pciInfo.pdev = NULL;
 780
 781                 mxser_getcfg(m, &hwconf);
 782                 /*
 783                  * init mxsercfg first,
 784                  * or mxsercfg data is not correct on ISR.
 785                  */
 786                 /* mxser_initbrd will hook ISR. */
 787                 if (mxser_initbrd(m, &hwconf) < 0)
 788                         continue;
 789
 790                 m++;
 791         }
 792
 793         /* Start finding ISA boards from module arg */
 794         for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
 795                 int cap;
 796
 797                 if (!(cap = ioaddr[b]))
 798                         continue;
 799
 800                 retval = mxser_get_ISA_conf(cap, &hwconf);
 801
 802                 if (retval != 0)
 803                         printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n",
 804                                 mxser_brdname[hwconf.board_type - 1], ioaddr[b]);
 805
 806                 if (retval <= 0) {
 807                         if (retval == MXSER_ERR_IRQ)
 808                                 printk(KERN_ERR "Invalid interrupt number, "
 809                                         "board not configured\n");
 810                         else if (retval == MXSER_ERR_IRQ_CONFLIT)
 811                                 printk(KERN_ERR "Invalid interrupt number, "
 812                                         "board not configured\n");
 813                         else if (retval == MXSER_ERR_VECTOR)
 814                                 printk(KERN_ERR "Invalid interrupt vector, "
 815                                         "board not configured\n");
 816                         else if (retval == MXSER_ERR_IOADDR)
 817                                 printk(KERN_ERR "Invalid I/O address, "
 818                                         "board not configured\n");
 819
 820                         continue;
 821                 }
 822
 823                 hwconf.pciInfo.busNum = 0;
 824                 hwconf.pciInfo.devNum = 0;
 825                 hwconf.pciInfo.pdev = NULL;
 826
 827                 mxser_getcfg(m, &hwconf);
 828                 /*
 829                  * init mxsercfg first,
 830                  * or mxsercfg data is not correct on ISR.
 831                  */
 832                 /* mxser_initbrd will hook ISR. */
 833                 if (mxser_initbrd(m, &hwconf) < 0)
 834                         continue;
 835
 836                 m++;
 837         }
 838
 839         /* start finding PCI board here */
 840 #ifdef CONFIG_PCI
 841         n = ARRAY_SIZE(mxser_pcibrds) - 1;
 842         index = 0;
 843         b = 0;
 844         while (b < n) {
 845                 pdev = pci_get_device(mxser_pcibrds[b].vendor,
 846                                 mxser_pcibrds[b].device, pdev);
 847                 if (pdev == NULL) {
 848                         b++;
 849                         continue;
 850                 }
 851                 hwconf.pciInfo.busNum = busnum = pdev->bus->number;
 852                 hwconf.pciInfo.devNum = devnum = PCI_SLOT(pdev->devfn) << 3;
 853                 hwconf.pciInfo.pdev = pdev;
 854                 printk(KERN_INFO "Found MOXA %s board(BusNo=%d,DevNo=%d)\n",
 855                         mxser_brdname[(int) (mxser_pcibrds[b].driver_data) - 1],
 856                         busnum, devnum >> 3);
 857                 index++;
 858                 if (m >= MXSER_BOARDS)
 859                         printk(KERN_ERR
 860                                 "Too many Smartio/Industio family boards find "
 861                                 "(maximum %d), board not configured\n",
 862                                 MXSER_BOARDS);
 863                 else {
 864                         if (pci_enable_device(pdev)) {
 865                                 printk(KERN_ERR "Moxa SmartI/O PCI enable "
 866                                         "fail !\n");
 867                                 continue;
 868                         }
 869                         retval = mxser_get_PCI_conf(busnum, devnum,
 870                                         (int)mxser_pcibrds[b].driver_data,
 871                                         &hwconf);
 872                         if (retval < 0) {
 873                                 if (retval == MXSER_ERR_IRQ)
 874                                         printk(KERN_ERR
 875                                                 "Invalid interrupt number, "
 876                                                 "board not configured\n");
 877                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
 878                                         printk(KERN_ERR
 879                                                 "Invalid interrupt number, "
 880                                                 "board not configured\n");
 881                                 else if (retval == MXSER_ERR_VECTOR)
 882                                         printk(KERN_ERR
 883                                                 "Invalid interrupt vector, "
 884                                                 "board not configured\n");
 885                                 else if (retval == MXSER_ERR_IOADDR)
 886                                         printk(KERN_ERR
 887                                                 "Invalid I/O address, "
 888                                                 "board not configured\n");
 889                                 continue;
 890                         }
 891                         mxser_getcfg(m, &hwconf);
 892                         /* init mxsercfg first,
 893                          * or mxsercfg data is not correct on ISR.
 894                          */
 895                         /* mxser_initbrd will hook ISR. */
 896                         if (mxser_initbrd(m, &hwconf) < 0)
 897                                 continue;
 898                         m++;
 899                         /* Keep an extra reference if we succeeded. It will
 900                            be returned at unload time */
 901                         pci_dev_get(pdev);
 902                 }
 903         }
 904 #endif
 905
 906         retval = tty_register_driver(mxvar_sdriver);
 907         if (retval) {
 908                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family"
 909                                 " driver !\n");
 910                 put_tty_driver(mxvar_sdriver);
 911
 912                 for (i = 0; i < MXSER_BOARDS; i++) {
 913                         if (mxsercfg[i].board_type == -1)
 914                                 continue;
 915                         else {
 916                                 free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]);
 917                                 /* todo: release io, vector */
 918                         }
 919                 }
 920                 return retval;
 921         }
 922
 923         return 0;
 924 }
 925
 926 static void mxser_do_softint(struct work_struct *work)
 927 {
 928         struct mxser_struct *info =
 929                 container_of(work, struct mxser_struct, tqueue);
 930         struct tty_struct *tty;
 931
 932         tty = info->tty;
 933
 934         if (tty) {
 935                 if (test_and_clear_bit(MXSER_EVENT_TXLOW, &info->event))
 936                         tty_wakeup(tty);
 937                 if (test_and_clear_bit(MXSER_EVENT_HANGUP, &info->event))
 938                         tty_hangup(tty);
 939         }
 940 }
 941
 942 static unsigned char mxser_get_msr(int baseaddr, int mode, int port, struct mxser_struct *info)
 943 {
 944         unsigned char status = 0;
 945
 946         status = inb(baseaddr + UART_MSR);
 947
 948         mxser_msr[port] &= 0x0F;
 949         mxser_msr[port] |= status;
 950         status = mxser_msr[port];
 951         if (mode)
 952                 mxser_msr[port] = 0;
 953
 954         return status;
 955 }
 956
 957 /*
 958  * This routine is called whenever a serial port is opened.  It
 959  * enables interrupts for a serial port, linking in its async structure into
 960  * the IRQ chain.   It also performs the serial-specific
 961  * initialization for the tty structure.
 962  */
 963 static int mxser_open(struct tty_struct *tty, struct file *filp)
 964 {
 965         struct mxser_struct *info;
 966         int retval, line;
 967
 968         /* initialize driver_data in case something fails */
 969         tty->driver_data = NULL;
 970
 971         line = tty->index;
 972         if (line == MXSER_PORTS)
 973                 return 0;
 974         if (line < 0 || line > MXSER_PORTS)
 975                 return -ENODEV;
 976         info = mxvar_table + line;
 977         if (!info->base)
 978                 return -ENODEV;
 979
 980         tty->driver_data = info;
 981         info->tty = tty;
 982         /*
 983          * Start up serial port
 984          */
 985         retval = mxser_startup(info);
 986         if (retval)
 987                 return retval;
 988
 989         retval = mxser_block_til_ready(tty, filp, info);
 990         if (retval)
 991                 return retval;
 992
 993         info->count++;
 994
 995         if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
 996                 if (tty->driver->subtype == SERIAL_TYPE_NORMAL)
 997                         *tty->termios = info->normal_termios;
 998                 else
 999                         *tty->termios = info->callout_termios;
1000                 mxser_change_speed(info, NULL);
1001         }
1002
1003         info->session = process_session(current);
1004         info->pgrp = process_group(current);
1005
1006         /*
1007         status = mxser_get_msr(info->base, 0, info->port);
1008         mxser_check_modem_status(info, status);
1009         */
1010
1011 /* unmark here for very high baud rate (ex. 921600 bps) used */
1012         tty->low_latency = 1;
1013         return 0;
1014 }
1015
1016 /*
1017  * This routine is called when the serial port gets closed.  First, we
1018  * wait for the last remaining data to be sent.  Then, we unlink its
1019  * async structure from the interrupt chain if necessary, and we free
1020  * that IRQ if nothing is left in the chain.
1021  */
1022 static void mxser_close(struct tty_struct *tty, struct file *filp)
1023 {
1024         struct mxser_struct *info = tty->driver_data;
1025
1026         unsigned long timeout;
1027         unsigned long flags;
1028         struct tty_ldisc *ld;
1029
1030         if (tty->index == MXSER_PORTS)
1031                 return;
1032         if (!info)
1033                 return;
1034
1035         spin_lock_irqsave(&info->slock, flags);
1036
1037         if (tty_hung_up_p(filp)) {
1038                 spin_unlock_irqrestore(&info->slock, flags);
1039                 return;
1040         }
1041         if ((tty->count == 1) && (info->count != 1)) {
1042                 /*
1043                  * Uh, oh.  tty->count is 1, which means that the tty
1044                  * structure will be freed.  Info->count should always
1045                  * be one in these conditions.  If it's greater than
1046                  * one, we've got real problems, since it means the
1047                  * serial port won't be shutdown.
1048                  */
1049                 printk(KERN_ERR "mxser_close: bad serial port count; "
1050                         "tty->count is 1, info->count is %d\n", info->count);
1051                 info->count = 1;
1052         }
1053         if (--info->count < 0) {
1054                 printk(KERN_ERR "mxser_close: bad serial port count for "
1055                         "ttys%d: %d\n", info->port, info->count);
1056                 info->count = 0;
1057         }
1058         if (info->count) {
1059                 spin_unlock_irqrestore(&info->slock, flags);
1060                 return;
1061         }
1062         info->flags |= ASYNC_CLOSING;
1063         spin_unlock_irqrestore(&info->slock, flags);
1064         /*
1065          * Save the termios structure, since this port may have
1066          * separate termios for callout and dialin.
1067          */
1068         if (info->flags & ASYNC_NORMAL_ACTIVE)
1069                 info->normal_termios = *tty->termios;
1070         /*
1071          * Now we wait for the transmit buffer to clear; and we notify
1072          * the line discipline to only process XON/XOFF characters.
1073          */
1074         tty->closing = 1;
1075         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1076                 tty_wait_until_sent(tty, info->closing_wait);
1077         /*
1078          * At this point we stop accepting input.  To do this, we
1079          * disable the receive line status interrupts, and tell the
1080          * interrupt driver to stop checking the data ready bit in the
1081          * line status register.
1082          */
1083         info->IER &= ~UART_IER_RLSI;
1084         if (info->IsMoxaMustChipFlag)
1085                 info->IER &= ~MOXA_MUST_RECV_ISR;
1086 /* by William
1087         info->read_status_mask &= ~UART_LSR_DR;
1088 */
1089         if (info->flags & ASYNC_INITIALIZED) {
1090                 outb(info->IER, info->base + UART_IER);
1091                 /*
1092                  * Before we drop DTR, make sure the UART transmitter
1093                  * has completely drained; this is especially
1094                  * important if there is a transmit FIFO!
1095                  */
1096                 timeout = jiffies + HZ;
1097                 while (!(inb(info->base + UART_LSR) & UART_LSR_TEMT)) {
1098                         schedule_timeout_interruptible(5);
1099                         if (time_after(jiffies, timeout))
1100                                 break;
1101                 }
1102         }
1103         mxser_shutdown(info);
1104
1105         if (tty->driver->flush_buffer)
1106                 tty->driver->flush_buffer(tty);
1107
1108         ld = tty_ldisc_ref(tty);
1109         if (ld) {
1110                 if (ld->flush_buffer)
1111                         ld->flush_buffer(tty);
1112                 tty_ldisc_deref(ld);
1113         }
1114
1115         tty->closing = 0;
1116         info->event = 0;
1117         info->tty = NULL;
1118         if (info->blocked_open) {
1119                 if (info->close_delay)
1120                         schedule_timeout_interruptible(info->close_delay);
1121                 wake_up_interruptible(&info->open_wait);
1122         }
1123
1124         info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1125         wake_up_interruptible(&info->close_wait);
1126
1127 }
1128
1129 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1130 {
1131         int c, total = 0;
1132         struct mxser_struct *info = tty->driver_data;
1133         unsigned long flags;
1134
1135         if (!info->xmit_buf)
1136                 return 0;
1137
1138         while (1) {
1139                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1140                                           SERIAL_XMIT_SIZE - info->xmit_head));
1141                 if (c <= 0)
1142                         break;
1143
1144                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1145                 spin_lock_irqsave(&info->slock, flags);
1146                 info->xmit_head = (info->xmit_head + c) &
1147                                   (SERIAL_XMIT_SIZE - 1);
1148                 info->xmit_cnt += c;
1149                 spin_unlock_irqrestore(&info->slock, flags);
1150
1151                 buf += c;
1152                 count -= c;
1153                 total += c;
1154         }
1155
1156         if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1157                 if (!tty->hw_stopped ||
1158                                 (info->type == PORT_16550A) ||
1159                                 (info->IsMoxaMustChipFlag)) {
1160                         spin_lock_irqsave(&info->slock, flags);
1161                         info->IER |= UART_IER_THRI;
1162                         outb(info->IER, info->base + UART_IER);
1163                         spin_unlock_irqrestore(&info->slock, flags);
1164                 }
1165         }
1166         return total;
1167 }
1168
1169 static void mxser_put_char(struct tty_struct *tty, unsigned char ch)
1170 {
1171         struct mxser_struct *info = tty->driver_data;
1172         unsigned long flags;
1173
1174         if (!info->xmit_buf)
1175                 return;
1176
1177         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1178                 return;
1179
1180         spin_lock_irqsave(&info->slock, flags);
1181         info->xmit_buf[info->xmit_head++] = ch;
1182         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1183         info->xmit_cnt++;
1184         spin_unlock_irqrestore(&info->slock, flags);
1185         if (!tty->stopped && !(info->IER & UART_IER_THRI)) {
1186                 if (!tty->hw_stopped ||
1187                                 (info->type == PORT_16550A) ||
1188                                 info->IsMoxaMustChipFlag) {
1189                         spin_lock_irqsave(&info->slock, flags);
1190                         info->IER |= UART_IER_THRI;
1191                         outb(info->IER, info->base + UART_IER);
1192                         spin_unlock_irqrestore(&info->slock, flags);
1193                 }
1194         }
1195 }
1196
1197
1198 static void mxser_flush_chars(struct tty_struct *tty)
1199 {
1200         struct mxser_struct *info = tty->driver_data;
1201         unsigned long flags;
1202
1203         if (info->xmit_cnt <= 0 ||
1204                         tty->stopped ||
1205                         !info->xmit_buf ||
1206                         (tty->hw_stopped &&
1207                          (info->type != PORT_16550A) &&
1208                          (!info->IsMoxaMustChipFlag)
1209                         ))
1210                 return;
1211
1212         spin_lock_irqsave(&info->slock, flags);
1213
1214         info->IER |= UART_IER_THRI;
1215         outb(info->IER, info->base + UART_IER);
1216
1217         spin_unlock_irqrestore(&info->slock, flags);
1218 }
1219
1220 static int mxser_write_room(struct tty_struct *tty)
1221 {
1222         struct mxser_struct *info = tty->driver_data;
1223         int ret;
1224
1225         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1226         if (ret < 0)
1227                 ret = 0;
1228         return ret;
1229 }
1230
1231 static int mxser_chars_in_buffer(struct tty_struct *tty)
1232 {
1233         struct mxser_struct *info = tty->driver_data;
1234         return info->xmit_cnt;
1235 }
1236
1237 static void mxser_flush_buffer(struct tty_struct *tty)
1238 {
1239         struct mxser_struct *info = tty->driver_data;
1240         char fcr;
1241         unsigned long flags;
1242
1243
1244         spin_lock_irqsave(&info->slock, flags);
1245         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1246
1247         /* below added by shinhay */
1248         fcr = inb(info->base + UART_FCR);
1249         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1250                 info->base + UART_FCR);
1251         outb(fcr, info->base + UART_FCR);
1252
1253         spin_unlock_irqrestore(&info->slock, flags);
1254         /* above added by shinhay */
1255
1256         wake_up_interruptible(&tty->write_wait);
1257         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
1258                 (tty->ldisc.write_wakeup) (tty);
1259 }
1260
1261 static int mxser_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1262 {
1263         struct mxser_struct *info = tty->driver_data;
1264         int retval;
1265         struct async_icount cprev, cnow;        /* kernel counter temps */
1266         struct serial_icounter_struct __user *p_cuser;
1267         unsigned long templ;
1268         unsigned long flags;
1269         void __user *argp = (void __user *)arg;
1270
1271         if (tty->index == MXSER_PORTS)
1272                 return mxser_ioctl_special(cmd, argp);
1273
1274         /* following add by Victor Yu. 01-05-2004 */
1275         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1276                 int opmode, p;
1277                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1278                 int shiftbit;
1279                 unsigned char val, mask;
1280
1281                 p = info->port % 4;
1282                 if (cmd == MOXA_SET_OP_MODE) {
1283                         if (get_user(opmode, (int __user *) argp))
1284                                 return -EFAULT;
1285                         if (opmode != RS232_MODE &&
1286                                         opmode != RS485_2WIRE_MODE &&
1287                                         opmode != RS422_MODE &&
1288                                         opmode != RS485_4WIRE_MODE)
1289                                 return -EFAULT;
1290                         mask = ModeMask[p];
1291                         shiftbit = p * 2;
1292                         val = inb(info->opmode_ioaddr);
1293                         val &= mask;
1294                         val |= (opmode << shiftbit);
1295                         outb(val, info->opmode_ioaddr);
1296                 } else {
1297                         shiftbit = p * 2;
1298                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1299                         opmode &= OP_MODE_MASK;
1300                         if (copy_to_user(argp, &opmode, sizeof(int)))
1301                                 return -EFAULT;
1302                 }
1303                 return 0;
1304         }
1305         /* above add by Victor Yu. 01-05-2004 */
1306
1307         if ((cmd != TIOCGSERIAL) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1308                 if (tty->flags & (1 << TTY_IO_ERROR))
1309                         return -EIO;
1310         }
1311         switch (cmd) {
1312         case TCSBRK:            /* SVID version: non-zero arg --> no break */
1313                 retval = tty_check_change(tty);
1314                 if (retval)
1315                         return retval;
1316                 tty_wait_until_sent(tty, 0);
1317                 if (!arg)
1318                         mxser_send_break(info, HZ / 4); /* 1/4 second */
1319                 return 0;
1320         case TCSBRKP:           /* support for POSIX tcsendbreak() */
1321                 retval = tty_check_change(tty);
1322                 if (retval)
1323                         return retval;
1324                 tty_wait_until_sent(tty, 0);
1325                 mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1326                 return 0;
1327         case TIOCGSOFTCAR:
1328                 return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *)argp);
1329         case TIOCSSOFTCAR:
1330                 if (get_user(templ, (unsigned long __user *) argp))
1331                         return -EFAULT;
1332                 arg = templ;
1333                 tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
1334                 return 0;
1335         case TIOCGSERIAL:
1336                 return mxser_get_serial_info(info, argp);
1337         case TIOCSSERIAL:
1338                 return mxser_set_serial_info(info, argp);
1339         case TIOCSERGETLSR:     /* Get line status register */
1340                 return mxser_get_lsr_info(info, argp);
1341                 /*
1342                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1343                  * - mask passed in arg for lines of interest
1344                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1345                  * Caller should use TIOCGICOUNT to see which one it was
1346                  */
1347         case TIOCMIWAIT: {
1348                         DECLARE_WAITQUEUE(wait, current);
1349                         int ret;
1350                         spin_lock_irqsave(&info->slock, flags);
1351                         cprev = info->icount;   /* note the counters on entry */
1352                         spin_unlock_irqrestore(&info->slock, flags);
1353
1354                         add_wait_queue(&info->delta_msr_wait, &wait);
1355                         while (1) {
1356                                 spin_lock_irqsave(&info->slock, flags);
1357                                 cnow = info->icount;    /* atomic copy */
1358                                 spin_unlock_irqrestore(&info->slock, flags);
1359
1360                                 set_current_state(TASK_INTERRUPTIBLE);
1361                                 if (((arg & TIOCM_RNG) &&
1362                                                 (cnow.rng != cprev.rng)) ||
1363                                                 ((arg & TIOCM_DSR) &&
1364                                                 (cnow.dsr != cprev.dsr)) ||
1365                                                 ((arg & TIOCM_CD) &&
1366                                                 (cnow.dcd != cprev.dcd)) ||
1367                                                 ((arg & TIOCM_CTS) &&
1368                                                 (cnow.cts != cprev.cts))) {
1369                                         ret = 0;
1370                                         break;
1371                                 }
1372                                 /* see if a signal did it */
1373                                 if (signal_pending(current)) {
1374                                         ret = -ERESTARTSYS;
1375                                         break;
1376                                 }
1377                                 cprev = cnow;
1378                         }
1379                         current->state = TASK_RUNNING;
1380                         remove_wait_queue(&info->delta_msr_wait, &wait);
1381                         break;
1382                 }
1383                 /* NOTREACHED */
1384                 /*
1385                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1386                  * Return: write counters to the user passed counter struct
1387                  * NB: both 1->0 and 0->1 transitions are counted except for
1388                  *     RI where only 0->1 is counted.
1389                  */
1390         case TIOCGICOUNT:
1391                 spin_lock_irqsave(&info->slock, flags);
1392                 cnow = info->icount;
1393                 spin_unlock_irqrestore(&info->slock, flags);
1394                 p_cuser = argp;
1395                 /* modified by casper 1/11/2000 */
1396                 if (put_user(cnow.frame, &p_cuser->frame))
1397                         return -EFAULT;
1398                 if (put_user(cnow.brk, &p_cuser->brk))
1399                         return -EFAULT;
1400                 if (put_user(cnow.overrun, &p_cuser->overrun))
1401                         return -EFAULT;
1402                 if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1403                         return -EFAULT;
1404                 if (put_user(cnow.parity, &p_cuser->parity))
1405                         return -EFAULT;
1406                 if (put_user(cnow.rx, &p_cuser->rx))
1407                         return -EFAULT;
1408                 if (put_user(cnow.tx, &p_cuser->tx))
1409                         return -EFAULT;
1410                 put_user(cnow.cts, &p_cuser->cts);
1411                 put_user(cnow.dsr, &p_cuser->dsr);
1412                 put_user(cnow.rng, &p_cuser->rng);
1413                 put_user(cnow.dcd, &p_cuser->dcd);
1414                 return 0;
1415         case MOXA_HighSpeedOn:
1416                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1417         case MOXA_SDS_RSTICOUNTER: {
1418                         info->mon_data.rxcnt = 0;
1419                         info->mon_data.txcnt = 0;
1420                         return 0;
1421                 }
1422 /* (above) added by James. */
1423         case MOXA_ASPP_SETBAUD:{
1424                         long baud;
1425                         if (get_user(baud, (long __user *)argp))
1426                                 return -EFAULT;
1427                         mxser_set_baud(info, baud);
1428                         return 0;
1429                 }
1430         case MOXA_ASPP_GETBAUD:
1431                 if (copy_to_user(argp, &info->realbaud, sizeof(long)))
1432                         return -EFAULT;
1433
1434                 return 0;
1435
1436         case MOXA_ASPP_OQUEUE:{
1437                         int len, lsr;
1438
1439                         len = mxser_chars_in_buffer(tty);
1440
1441                         lsr = inb(info->base + UART_LSR) & UART_LSR_TEMT;
1442
1443                         len += (lsr ? 0 : 1);
1444
1445                         if (copy_to_user(argp, &len, sizeof(int)))
1446                                 return -EFAULT;
1447
1448                         return 0;
1449                 }
1450         case MOXA_ASPP_MON: {
1451                         int mcr, status;
1452
1453                         /* info->mon_data.ser_param = tty->termios->c_cflag; */
1454
1455                         status = mxser_get_msr(info->base, 1, info->port, info);
1456                         mxser_check_modem_status(info, status);
1457
1458                         mcr = inb(info->base + UART_MCR);
1459                         if (mcr & MOXA_MUST_MCR_XON_FLAG)
1460                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1461                         else
1462                                 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1463
1464                         if (mcr & MOXA_MUST_MCR_TX_XON)
1465                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1466                         else
1467                                 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1468
1469                         if (info->tty->hw_stopped)
1470                                 info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1471                         else
1472                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1473
1474                         if (copy_to_user(argp, &info->mon_data,
1475                                         sizeof(struct mxser_mon)))
1476                                 return -EFAULT;
1477
1478                         return 0;
1479                 }
1480
1481         case MOXA_ASPP_LSTATUS: {
1482                         if (copy_to_user(argp, &info->err_shadow,
1483                                         sizeof(unsigned char)))
1484                                 return -EFAULT;
1485
1486                         info->err_shadow = 0;
1487                         return 0;
1488                 }
1489         case MOXA_SET_BAUD_METHOD: {
1490                         int method;
1491
1492                         if (get_user(method, (int __user *)argp))
1493                                 return -EFAULT;
1494                         mxser_set_baud_method[info->port] = method;
1495                         if (copy_to_user(argp, &method, sizeof(int)))
1496                                 return -EFAULT;
1497
1498                         return 0;
1499                 }
1500         default:
1501                 return -ENOIOCTLCMD;
1502         }
1503         return 0;
1504 }
1505
1506 #ifndef CMSPAR
1507 #define CMSPAR 010000000000
1508 #endif
1509
1510 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1511 {
1512         int i, result, status;
1513
1514         switch (cmd) {
1515         case MOXA_GET_CONF:
1516                 if (copy_to_user(argp, mxsercfg,
1517                                 sizeof(struct mxser_hwconf) * 4))
1518                         return -EFAULT;
1519                 return 0;
1520         case MOXA_GET_MAJOR:
1521                 if (copy_to_user(argp, &ttymajor, sizeof(int)))
1522                         return -EFAULT;
1523                 return 0;
1524
1525         case MOXA_GET_CUMAJOR:
1526                 if (copy_to_user(argp, &calloutmajor, sizeof(int)))
1527                         return -EFAULT;
1528                 return 0;
1529
1530         case MOXA_CHKPORTENABLE:
1531                 result = 0;
1532                 for (i = 0; i < MXSER_PORTS; i++) {
1533                         if (mxvar_table[i].base)
1534                                 result |= (1 << i);
1535                 }
1536                 return put_user(result, (unsigned long __user *)argp);
1537         case MOXA_GETDATACOUNT:
1538                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1539                         return -EFAULT;
1540                 return 0;
1541         case MOXA_GETMSTATUS:
1542                 for (i = 0; i < MXSER_PORTS; i++) {
1543                         GMStatus[i].ri = 0;
1544                         if (!mxvar_table[i].base) {
1545                                 GMStatus[i].dcd = 0;
1546                                 GMStatus[i].dsr = 0;
1547                                 GMStatus[i].cts = 0;
1548                                 continue;
1549                         }
1550
1551                         if (!mxvar_table[i].tty || !mxvar_table[i].tty->termios)
1552                                 GMStatus[i].cflag = mxvar_table[i].normal_termios.c_cflag;
1553                         else
1554                                 GMStatus[i].cflag = mxvar_table[i].tty->termios->c_cflag;
1555
1556                         status = inb(mxvar_table[i].base + UART_MSR);
1557                         if (status & 0x80 /*UART_MSR_DCD */ )
1558                                 GMStatus[i].dcd = 1;
1559                         else
1560                                 GMStatus[i].dcd = 0;
1561
1562                         if (status & 0x20 /*UART_MSR_DSR */ )
1563                                 GMStatus[i].dsr = 1;
1564                         else
1565                                 GMStatus[i].dsr = 0;
1566
1567
1568                         if (status & 0x10 /*UART_MSR_CTS */ )
1569                                 GMStatus[i].cts = 1;
1570                         else
1571                                 GMStatus[i].cts = 0;
1572                 }
1573                 if (copy_to_user(argp, GMStatus,
1574                                 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1575                         return -EFAULT;
1576                 return 0;
1577         case MOXA_ASPP_MON_EXT: {
1578                         int status;
1579                         int opmode, p;
1580                         int shiftbit;
1581                         unsigned cflag, iflag;
1582
1583                         for (i = 0; i < MXSER_PORTS; i++) {
1584                                 if (!mxvar_table[i].base)
1585                                         continue;
1586
1587                                 status = mxser_get_msr(mxvar_table[i].base, 0,
1588                                                         i, &(mxvar_table[i]));
1589                                 /*
1590                                 mxser_check_modem_status(&mxvar_table[i],
1591                                                                 status);
1592                                 */
1593                                 if (status & UART_MSR_TERI)
1594                                         mxvar_table[i].icount.rng++;
1595                                 if (status & UART_MSR_DDSR)
1596                                         mxvar_table[i].icount.dsr++;
1597                                 if (status & UART_MSR_DDCD)
1598                                         mxvar_table[i].icount.dcd++;
1599                                 if (status & UART_MSR_DCTS)
1600                                         mxvar_table[i].icount.cts++;
1601
1602                                 mxvar_table[i].mon_data.modem_status = status;
1603                                 mon_data_ext.rx_cnt[i] = mxvar_table[i].mon_data.rxcnt;
1604                                 mon_data_ext.tx_cnt[i] = mxvar_table[i].mon_data.txcnt;
1605                                 mon_data_ext.up_rxcnt[i] = mxvar_table[i].mon_data.up_rxcnt;
1606                                 mon_data_ext.up_txcnt[i] = mxvar_table[i].mon_data.up_txcnt;
1607                                 mon_data_ext.modem_status[i] = mxvar_table[i].mon_data.modem_status;
1608                                 mon_data_ext.baudrate[i] = mxvar_table[i].realbaud;
1609
1610                                 if (!mxvar_table[i].tty || !mxvar_table[i].tty->termios) {
1611                                         cflag = mxvar_table[i].normal_termios.c_cflag;
1612                                         iflag = mxvar_table[i].normal_termios.c_iflag;
1613                                 } else {
1614                                         cflag = mxvar_table[i].tty->termios->c_cflag;
1615                                         iflag = mxvar_table[i].tty->termios->c_iflag;
1616                                 }
1617
1618                                 mon_data_ext.databits[i] = cflag & CSIZE;
1619
1620                                 mon_data_ext.stopbits[i] = cflag & CSTOPB;
1621
1622                                 mon_data_ext.parity[i] = cflag & (PARENB | PARODD | CMSPAR);
1623
1624                                 mon_data_ext.flowctrl[i] = 0x00;
1625
1626                                 if (cflag & CRTSCTS)
1627                                         mon_data_ext.flowctrl[i] |= 0x03;
1628
1629                                 if (iflag & (IXON | IXOFF))
1630                                         mon_data_ext.flowctrl[i] |= 0x0C;
1631
1632                                 if (mxvar_table[i].type == PORT_16550A)
1633                                         mon_data_ext.fifo[i] = 1;
1634                                 else
1635                                         mon_data_ext.fifo[i] = 0;
1636
1637                                 p = i % 4;
1638                                 shiftbit = p * 2;
1639                                 opmode = inb(mxvar_table[i].opmode_ioaddr) >> shiftbit;
1640                                 opmode &= OP_MODE_MASK;
1641
1642                                 mon_data_ext.iftype[i] = opmode;
1643
1644                         }
1645                         if (copy_to_user(argp, &mon_data_ext, sizeof(struct mxser_mon_ext)))
1646                                 return -EFAULT;
1647
1648                         return 0;
1649
1650                 }
1651         default:
1652                 return -ENOIOCTLCMD;
1653         }
1654         return 0;
1655 }
1656
1657 static void mxser_stoprx(struct tty_struct *tty)
1658 {
1659         struct mxser_struct *info = tty->driver_data;
1660         /* unsigned long flags; */
1661
1662         info->ldisc_stop_rx = 1;
1663         if (I_IXOFF(tty)) {
1664                 /* MX_LOCK(&info->slock); */
1665                 /* following add by Victor Yu. 09-02-2002 */
1666                 if (info->IsMoxaMustChipFlag) {
1667                         info->IER &= ~MOXA_MUST_RECV_ISR;
1668                         outb(info->IER, info->base + UART_IER);
1669                 } else {
1670                         /* above add by Victor Yu. 09-02-2002 */
1671                         info->x_char = STOP_CHAR(tty);
1672                         /* mask by Victor Yu. 09-02-2002 */
1673                         /* outb(info->IER, 0); */
1674                         outb(0, info->base + UART_IER);
1675                         info->IER |= UART_IER_THRI;
1676                         /* force Tx interrupt */
1677                         outb(info->IER, info->base + UART_IER);
1678                 }               /* add by Victor Yu. 09-02-2002 */
1679                 /* MX_UNLOCK(&info->slock); */
1680         }
1681
1682         if (info->tty->termios->c_cflag & CRTSCTS) {
1683                 /* MX_LOCK(&info->slock); */
1684                 info->MCR &= ~UART_MCR_RTS;
1685                 outb(info->MCR, info->base + UART_MCR);
1686                 /* MX_UNLOCK(&info->slock); */
1687         }
1688 }
1689
1690 static void mxser_startrx(struct tty_struct *tty)
1691 {
1692         struct mxser_struct *info = tty->driver_data;
1693         /* unsigned long flags; */
1694
1695         info->ldisc_stop_rx = 0;
1696         if (I_IXOFF(tty)) {
1697                 if (info->x_char)
1698                         info->x_char = 0;
1699                 else {
1700                         /* MX_LOCK(&info->slock); */
1701
1702                         /* following add by Victor Yu. 09-02-2002 */
1703                         if (info->IsMoxaMustChipFlag) {
1704                                 info->IER |= MOXA_MUST_RECV_ISR;
1705                                 outb(info->IER, info->base + UART_IER);
1706                         } else {
1707                                 /* above add by Victor Yu. 09-02-2002 */
1708
1709                                 info->x_char = START_CHAR(tty);
1710                                 /* mask by Victor Yu. 09-02-2002 */
1711                                 /* outb(info->IER, 0); */
1712                                 /* add by Victor Yu. 09-02-2002 */
1713                                 outb(0, info->base + UART_IER);
1714                                 /* force Tx interrupt */
1715                                 info->IER |= UART_IER_THRI;
1716                                 outb(info->IER, info->base + UART_IER);
1717                         }       /* add by Victor Yu. 09-02-2002 */
1718                         /* MX_UNLOCK(&info->slock); */
1719                 }
1720         }
1721
1722         if (info->tty->termios->c_cflag & CRTSCTS) {
1723                 /* MX_LOCK(&info->slock); */
1724                 info->MCR |= UART_MCR_RTS;
1725                 outb(info->MCR, info->base + UART_MCR);
1726                 /* MX_UNLOCK(&info->slock); */
1727         }
1728 }
1729
1730 /*
1731  * This routine is called by the upper-layer tty layer to signal that
1732  * incoming characters should be throttled.
1733  */
1734 static void mxser_throttle(struct tty_struct *tty)
1735 {
1736         /* struct mxser_struct *info = tty->driver_data; */
1737         /* unsigned long flags; */
1738
1739         /* MX_LOCK(&info->slock); */
1740         mxser_stoprx(tty);
1741         /* MX_UNLOCK(&info->slock); */
1742 }
1743
1744 static void mxser_unthrottle(struct tty_struct *tty)
1745 {
1746         /* struct mxser_struct *info = tty->driver_data; */
1747         /* unsigned long flags; */
1748
1749         /* MX_LOCK(&info->slock); */
1750         mxser_startrx(tty);
1751         /* MX_UNLOCK(&info->slock); */
1752 }
1753
1754 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1755 {
1756         struct mxser_struct *info = tty->driver_data;
1757         unsigned long flags;
1758
1759         if ((tty->termios->c_cflag != old_termios->c_cflag) ||
1760                         (RELEVANT_IFLAG(tty->termios->c_iflag) != RELEVANT_IFLAG(old_termios->c_iflag))) {
1761
1762                 mxser_change_speed(info, old_termios);
1763
1764                 if ((old_termios->c_cflag & CRTSCTS) &&
1765                                 !(tty->termios->c_cflag & CRTSCTS)) {
1766                         tty->hw_stopped = 0;
1767                         mxser_start(tty);
1768                 }
1769         }
1770
1771 /* Handle sw stopped */
1772         if ((old_termios->c_iflag & IXON) &&
1773                         !(tty->termios->c_iflag & IXON)) {
1774                 tty->stopped = 0;
1775
1776                 /* following add by Victor Yu. 09-02-2002 */
1777                 if (info->IsMoxaMustChipFlag) {
1778                         spin_lock_irqsave(&info->slock, flags);
1779                         DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base);
1780                         spin_unlock_irqrestore(&info->slock, flags);
1781                 }
1782                 /* above add by Victor Yu. 09-02-2002 */
1783
1784                 mxser_start(tty);
1785         }
1786 }
1787
1788 /*
1789  * mxser_stop() and mxser_start()
1790  *
1791  * This routines are called before setting or resetting tty->stopped.
1792  * They enable or disable transmitter interrupts, as necessary.
1793  */
1794 static void mxser_stop(struct tty_struct *tty)
1795 {
1796         struct mxser_struct *info = tty->driver_data;
1797         unsigned long flags;
1798
1799         spin_lock_irqsave(&info->slock, flags);
1800         if (info->IER & UART_IER_THRI) {
1801                 info->IER &= ~UART_IER_THRI;
1802                 outb(info->IER, info->base + UART_IER);
1803         }
1804         spin_unlock_irqrestore(&info->slock, flags);
1805 }
1806
1807 static void mxser_start(struct tty_struct *tty)
1808 {
1809         struct mxser_struct *info = tty->driver_data;
1810         unsigned long flags;
1811
1812         spin_lock_irqsave(&info->slock, flags);
1813         if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
1814                 info->IER |= UART_IER_THRI;
1815                 outb(info->IER, info->base + UART_IER);
1816         }
1817         spin_unlock_irqrestore(&info->slock, flags);
1818 }
1819
1820 /*
1821  * mxser_wait_until_sent() --- wait until the transmitter is empty
1822  */
1823 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1824 {
1825         struct mxser_struct *info = tty->driver_data;
1826         unsigned long orig_jiffies, char_time;
1827         int lsr;
1828
1829         if (info->type == PORT_UNKNOWN)
1830                 return;
1831
1832         if (info->xmit_fifo_size == 0)
1833                 return;         /* Just in case.... */
1834
1835         orig_jiffies = jiffies;
1836         /*
1837          * Set the check interval to be 1/5 of the estimated time to
1838          * send a single character, and make it at least 1.  The check
1839          * interval should also be less than the timeout.
1840          *
1841          * Note: we have to use pretty tight timings here to satisfy
1842          * the NIST-PCTS.
1843          */
1844         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1845         char_time = char_time / 5;
1846         if (char_time == 0)
1847                 char_time = 1;
1848         if (timeout && timeout < char_time)
1849                 char_time = timeout;
1850         /*
1851          * If the transmitter hasn't cleared in twice the approximate
1852          * amount of time to send the entire FIFO, it probably won't
1853          * ever clear.  This assumes the UART isn't doing flow
1854          * control, which is currently the case.  Hence, if it ever
1855          * takes longer than info->timeout, this is probably due to a
1856          * UART bug of some kind.  So, we clamp the timeout parameter at
1857          * 2*info->timeout.
1858          */
1859         if (!timeout || timeout > 2 * info->timeout)
1860                 timeout = 2 * info->timeout;
1861 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1862         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
1863                 timeout, char_time);
1864         printk("jiff=%lu...", jiffies);
1865 #endif
1866         while (!((lsr = inb(info->base + UART_LSR)) & UART_LSR_TEMT)) {
1867 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1868                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
1869 #endif
1870                 schedule_timeout_interruptible(char_time);
1871                 if (signal_pending(current))
1872                         break;
1873                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1874                         break;
1875         }
1876         set_current_state(TASK_RUNNING);
1877
1878 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1879         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1880 #endif
1881 }
1882
1883
1884 /*
1885  * This routine is called by tty_hangup() when a hangup is signaled.
1886  */
1887 void mxser_hangup(struct tty_struct *tty)
1888 {
1889         struct mxser_struct *info = tty->driver_data;
1890
1891         mxser_flush_buffer(tty);
1892         mxser_shutdown(info);
1893         info->event = 0;
1894         info->count = 0;
1895         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1896         info->tty = NULL;
1897         wake_up_interruptible(&info->open_wait);
1898 }
1899
1900
1901 /* added by James 03-12-2004. */
1902 /*
1903  * mxser_rs_break() --- routine which turns the break handling on or off
1904  */
1905 static void mxser_rs_break(struct tty_struct *tty, int break_state)
1906 {
1907         struct mxser_struct *info = tty->driver_data;
1908         unsigned long flags;
1909
1910         spin_lock_irqsave(&info->slock, flags);
1911         if (break_state == -1)
1912                 outb(inb(info->base + UART_LCR) | UART_LCR_SBC,
1913                         info->base + UART_LCR);
1914         else
1915                 outb(inb(info->base + UART_LCR) & ~UART_LCR_SBC,
1916                         info->base + UART_LCR);
1917         spin_unlock_irqrestore(&info->slock, flags);
1918 }
1919
1920 /* (above) added by James. */
1921
1922
1923 /*
1924  * This is the serial driver's generic interrupt routine
1925  */
1926 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
1927 {
1928         int status, iir, i;
1929         struct mxser_struct *info;
1930         struct mxser_struct *port;
1931         int max, irqbits, bits, msr;
1932         int pass_counter = 0;
1933         int handled = IRQ_NONE;
1934
1935         port = NULL;
1936         /* spin_lock(&gm_lock); */
1937
1938         for (i = 0; i < MXSER_BOARDS; i++) {
1939                 if (dev_id == &(mxvar_table[i * MXSER_PORTS_PER_BOARD])) {
1940                         port = dev_id;
1941                         break;
1942                 }
1943         }
1944
1945         if (i == MXSER_BOARDS)
1946                 goto irq_stop;
1947         if (port == 0)
1948                 goto irq_stop;
1949         max = mxser_numports[mxsercfg[i].board_type - 1];
1950         while (1) {
1951                 irqbits = inb(port->vector) & port->vectormask;
1952                 if (irqbits == port->vectormask)
1953                         break;
1954
1955                 handled = IRQ_HANDLED;
1956                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
1957                         if (irqbits == port->vectormask)
1958                                 break;
1959                         if (bits & irqbits)
1960                                 continue;
1961                         info = port + i;
1962
1963                         /* following add by Victor Yu. 09-13-2002 */
1964                         iir = inb(info->base + UART_IIR);
1965                         if (iir & UART_IIR_NO_INT)
1966                                 continue;
1967                         iir &= MOXA_MUST_IIR_MASK;
1968                         if (!info->tty) {
1969                                 status = inb(info->base + UART_LSR);
1970                                 outb(0x27, info->base + UART_FCR);
1971                                 inb(info->base + UART_MSR);
1972                                 continue;
1973                         }
1974                         /* above add by Victor Yu. 09-13-2002 */
1975                         /*
1976                            if (info->tty->flip.count < TTY_FLIPBUF_SIZE / 4) {
1977                            info->IER |= MOXA_MUST_RECV_ISR;
1978                            outb(info->IER, info->base + UART_IER);
1979                            }
1980                          */
1981
1982
1983                         /* mask by Victor Yu. 09-13-2002
1984                            if ( !info->tty ||
1985                            (inb(info->base + UART_IIR) & UART_IIR_NO_INT) )
1986                            continue;
1987                          */
1988                         /* mask by Victor Yu. 09-02-2002
1989                            status = inb(info->base + UART_LSR) & info->read_status_mask;
1990                          */
1991
1992                         /* following add by Victor Yu. 09-02-2002 */
1993                         status = inb(info->base + UART_LSR);
1994
1995                         if (status & UART_LSR_PE)
1996                                 info->err_shadow |= NPPI_NOTIFY_PARITY;
1997                         if (status & UART_LSR_FE)
1998                                 info->err_shadow |= NPPI_NOTIFY_FRAMING;
1999                         if (status & UART_LSR_OE)
2000                                 info->err_shadow |= NPPI_NOTIFY_HW_OVERRUN;
2001                         if (status & UART_LSR_BI)
2002                                 info->err_shadow |= NPPI_NOTIFY_BREAK;
2003
2004                         if (info->IsMoxaMustChipFlag) {
2005                                 /*
2006                                    if ( (status & 0x02) && !(status & 0x01) ) {
2007                                    outb(info->base+UART_FCR,  0x23);
2008                                    continue;
2009                                    }
2010                                  */
2011                                 if (iir == MOXA_MUST_IIR_GDA ||
2012                                                 iir == MOXA_MUST_IIR_RDA ||
2013                                                 iir == MOXA_MUST_IIR_RTO ||
2014                                                 iir == MOXA_MUST_IIR_LSR)
2015                                         mxser_receive_chars(info, &status);
2016
2017                         } else {
2018                                 /* above add by Victor Yu. 09-02-2002 */
2019
2020                                 status &= info->read_status_mask;
2021                                 if (status & UART_LSR_DR)
2022                                         mxser_receive_chars(info, &status);
2023                         }
2024                         msr = inb(info->base + UART_MSR);
2025                         if (msr & UART_MSR_ANY_DELTA) {
2026                                 mxser_check_modem_status(info, msr);
2027                         }
2028                         /* following add by Victor Yu. 09-13-2002 */
2029                         if (info->IsMoxaMustChipFlag) {
2030                                 if ((iir == 0x02) && (status & UART_LSR_THRE)) {
2031                                         mxser_transmit_chars(info);
2032                                 }
2033                         } else {
2034                                 /* above add by Victor Yu. 09-13-2002 */
2035
2036                                 if (status & UART_LSR_THRE) {
2037 /* 8-2-99 by William
2038                             if ( info->x_char || (info->xmit_cnt > 0) )
2039 */
2040                                         mxser_transmit_chars(info);
2041                                 }
2042                         }
2043                 }
2044                 if (pass_counter++ > MXSER_ISR_PASS_LIMIT) {
2045                         break;  /* Prevent infinite loops */
2046                 }
2047         }
2048
2049       irq_stop:
2050         /* spin_unlock(&gm_lock); */
2051         return handled;
2052 }
2053
2054 static void mxser_receive_chars(struct mxser_struct *info, int *status)
2055 {
2056         struct tty_struct *tty = info->tty;
2057         unsigned char ch, gdl;
2058         int ignored = 0;
2059         int cnt = 0;
2060         int recv_room;
2061         int max = 256;
2062         unsigned long flags;
2063
2064         spin_lock_irqsave(&info->slock, flags);
2065
2066         recv_room = tty->receive_room;
2067         if ((recv_room == 0) && (!info->ldisc_stop_rx)) {
2068                 /* mxser_throttle(tty); */
2069                 mxser_stoprx(tty);
2070                 /* return; */
2071         }
2072
2073         /* following add by Victor Yu. 09-02-2002 */
2074         if (info->IsMoxaMustChipFlag != MOXA_OTHER_UART) {
2075
2076                 if (*status & UART_LSR_SPECIAL) {
2077                         goto intr_old;
2078                 }
2079                 /* following add by Victor Yu. 02-11-2004 */
2080                 if (info->IsMoxaMustChipFlag == MOXA_MUST_MU860_HWID &&
2081                                 (*status & MOXA_MUST_LSR_RERR))
2082                         goto intr_old;
2083                 /* above add by Victor Yu. 02-14-2004 */
2084                 if (*status & MOXA_MUST_LSR_RERR)
2085                         goto intr_old;
2086
2087                 gdl = inb(info->base + MOXA_MUST_GDL_REGISTER);
2088
2089                 /* add by Victor Yu. 02-11-2004 */
2090                 if (info->IsMoxaMustChipFlag == MOXA_MUST_MU150_HWID)
2091                         gdl &= MOXA_MUST_GDL_MASK;
2092                 if (gdl >= recv_room) {
2093                         if (!info->ldisc_stop_rx) {
2094                                 /* mxser_throttle(tty); */
2095                                 mxser_stoprx(tty);
2096                         }
2097                         /* return; */
2098                 }
2099                 while (gdl--) {
2100                         ch = inb(info->base + UART_RX);
2101                         tty_insert_flip_char(tty, ch, 0);
2102                         cnt++;
2103                         /*
2104                            if ((cnt >= HI_WATER) && (info->stop_rx == 0)) {
2105                            mxser_stoprx(tty);
2106                            info->stop_rx = 1;
2107                            break;
2108                            } */
2109                 }
2110                 goto end_intr;
2111         }
2112  intr_old:
2113         /* above add by Victor Yu. 09-02-2002 */
2114
2115         do {
2116                 if (max-- < 0)
2117                         break;
2118                 /*
2119                    if ((cnt >= HI_WATER) && (info->stop_rx == 0)) {
2120                    mxser_stoprx(tty);
2121                    info->stop_rx=1;
2122                    break;
2123                    }
2124                  */
2125
2126                 ch = inb(info->base + UART_RX);
2127                 /* following add by Victor Yu. 09-02-2002 */
2128                 if (info->IsMoxaMustChipFlag && (*status & UART_LSR_OE) /*&& !(*status&UART_LSR_DR) */ )
2129                         outb(0x23, info->base + UART_FCR);
2130                 *status &= info->read_status_mask;
2131                 /* above add by Victor Yu. 09-02-2002 */
2132                 if (*status & info->ignore_status_mask) {
2133                         if (++ignored > 100)
2134                                 break;
2135                 } else {
2136                         char flag = 0;
2137                         if (*status & UART_LSR_SPECIAL) {
2138                                 if (*status & UART_LSR_BI) {
2139                                         flag = TTY_BREAK;
2140 /* added by casper 1/11/2000 */
2141                                         info->icount.brk++;
2142 /* */
2143                                         if (info->flags & ASYNC_SAK)
2144                                                 do_SAK(tty);
2145                                 } else if (*status & UART_LSR_PE) {
2146                                         flag = TTY_PARITY;
2147 /* added by casper 1/11/2000 */
2148                                         info->icount.parity++;
2149 /* */
2150                                 } else if (*status & UART_LSR_FE) {
2151                                         flag = TTY_FRAME;
2152 /* added by casper 1/11/2000 */
2153                                         info->icount.frame++;
2154 /* */
2155                                 } else if (*status & UART_LSR_OE) {
2156                                         flag = TTY_OVERRUN;
2157 /* added by casper 1/11/2000 */
2158                                         info->icount.overrun++;
2159 /* */
2160                                 }
2161                         }
2162                         tty_insert_flip_char(tty, ch, flag);
2163                         cnt++;
2164                         if (cnt >= recv_room) {
2165                                 if (!info->ldisc_stop_rx) {
2166                                         /* mxser_throttle(tty); */
2167                                         mxser_stoprx(tty);
2168                                 }
2169                                 break;
2170                         }
2171
2172                 }
2173
2174                 /* following add by Victor Yu. 09-02-2002 */
2175                 if (info->IsMoxaMustChipFlag)
2176                         break;
2177                 /* above add by Victor Yu. 09-02-2002 */
2178
2179                 /* mask by Victor Yu. 09-02-2002
2180                  *status = inb(info->base + UART_LSR) & info->read_status_mask;
2181                  */
2182                 /* following add by Victor Yu. 09-02-2002 */
2183                 *status = inb(info->base + UART_LSR);
2184                 /* above add by Victor Yu. 09-02-2002 */
2185         } while (*status & UART_LSR_DR);
2186
2187 end_intr:               /* add by Victor Yu. 09-02-2002 */
2188         mxvar_log.rxcnt[info->port] += cnt;
2189         info->mon_data.rxcnt += cnt;
2190         info->mon_data.up_rxcnt += cnt;
2191         spin_unlock_irqrestore(&info->slock, flags);
2192
2193         tty_flip_buffer_push(tty);
2194 }
2195
2196 static void mxser_transmit_chars(struct mxser_struct *info)
2197 {
2198         int count, cnt;
2199         unsigned long flags;
2200
2201         spin_lock_irqsave(&info->slock, flags);
2202
2203         if (info->x_char) {
2204                 outb(info->x_char, info->base + UART_TX);
2205                 info->x_char = 0;
2206                 mxvar_log.txcnt[info->port]++;
2207                 info->mon_data.txcnt++;
2208                 info->mon_data.up_txcnt++;
2209
2210 /* added by casper 1/11/2000 */
2211                 info->icount.tx++;
2212 /* */
2213                 spin_unlock_irqrestore(&info->slock, flags);
2214                 return;
2215         }
2216
2217         if (info->xmit_buf == 0) {
2218                 spin_unlock_irqrestore(&info->slock, flags);
2219                 return;
2220         }
2221
2222         if ((info->xmit_cnt <= 0) || info->tty->stopped ||
2223                         (info->tty->hw_stopped &&
2224                         (info->type != PORT_16550A) &&
2225                         (!info->IsMoxaMustChipFlag))) {
2226                 info->IER &= ~UART_IER_THRI;
2227                 outb(info->IER, info->base + UART_IER);
2228                 spin_unlock_irqrestore(&info->slock, flags);
2229                 return;
2230         }
2231
2232         cnt = info->xmit_cnt;
2233         count = info->xmit_fifo_size;
2234         do {
2235                 outb(info->xmit_buf[info->xmit_tail++],
2236                         info->base + UART_TX);
2237                 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2238                 if (--info->xmit_cnt <= 0)
2239                         break;
2240         } while (--count > 0);
2241         mxvar_log.txcnt[info->port] += (cnt - info->xmit_cnt);
2242
2243 /* added by James 03-12-2004. */
2244         info->mon_data.txcnt += (cnt - info->xmit_cnt);
2245         info->mon_data.up_txcnt += (cnt - info->xmit_cnt);
2246 /* (above) added by James. */
2247
2248 /* added by casper 1/11/2000 */
2249         info->icount.tx += (cnt - info->xmit_cnt);
2250 /* */
2251
2252         if (info->xmit_cnt < WAKEUP_CHARS) {
2253                 set_bit(MXSER_EVENT_TXLOW, &info->event);
2254                 schedule_work(&info->tqueue);
2255         }
2256         if (info->xmit_cnt <= 0) {
2257                 info->IER &= ~UART_IER_THRI;
2258                 outb(info->IER, info->base + UART_IER);
2259         }
2260         spin_unlock_irqrestore(&info->slock, flags);
2261 }
2262
2263 static void mxser_check_modem_status(struct mxser_struct *info, int status)
2264 {
2265         /* update input line counters */
2266         if (status & UART_MSR_TERI)
2267                 info->icount.rng++;
2268         if (status & UART_MSR_DDSR)
2269                 info->icount.dsr++;
2270         if (status & UART_MSR_DDCD)
2271                 info->icount.dcd++;
2272         if (status & UART_MSR_DCTS)
2273                 info->icount.cts++;
2274         info->mon_data.modem_status = status;
2275         wake_up_interruptible(&info->delta_msr_wait);
2276
2277         if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
2278                 if (status & UART_MSR_DCD)
2279                         wake_up_interruptible(&info->open_wait);
2280                 schedule_work(&info->tqueue);
2281         }
2282
2283         if (info->flags & ASYNC_CTS_FLOW) {
2284                 if (info->tty->hw_stopped) {
2285                         if (status & UART_MSR_CTS) {
2286                                 info->tty->hw_stopped = 0;
2287
2288                                 if ((info->type != PORT_16550A) &&
2289                                                 (!info->IsMoxaMustChipFlag)) {
2290                                         info->IER |= UART_IER_THRI;
2291                                         outb(info->IER, info->base + UART_IER);
2292                                 }
2293                                 set_bit(MXSER_EVENT_TXLOW, &info->event);
2294                                 schedule_work(&info->tqueue);                   }
2295                 } else {
2296                         if (!(status & UART_MSR_CTS)) {
2297                                 info->tty->hw_stopped = 1;
2298                                 if ((info->type != PORT_16550A) &&
2299                                                 (!info->IsMoxaMustChipFlag)) {
2300                                         info->IER &= ~UART_IER_THRI;
2301                                         outb(info->IER, info->base + UART_IER);
2302                                 }
2303                         }
2304                 }
2305         }
2306 }
2307
2308 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp, struct mxser_struct *info)
2309 {
2310         DECLARE_WAITQUEUE(wait, current);
2311         int retval;
2312         int do_clocal = 0;
2313         unsigned long flags;
2314
2315         /*
2316          * If non-blocking mode is set, or the port is not enabled,
2317          * then make the check up front and then exit.
2318          */
2319         if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) {
2320                 info->flags |= ASYNC_NORMAL_ACTIVE;
2321                 return 0;
2322         }
2323
2324         if (tty->termios->c_cflag & CLOCAL)
2325                 do_clocal = 1;
2326
2327         /*
2328          * Block waiting for the carrier detect and the line to become
2329          * free (i.e., not in use by the callout).  While we are in
2330          * this loop, info->count is dropped by one, so that
2331          * mxser_close() knows when to free things.  We restore it upon
2332          * exit, either normal or abnormal.
2333          */
2334         retval = 0;
2335         add_wait_queue(&info->open_wait, &wait);
2336
2337         spin_lock_irqsave(&info->slock, flags);
2338         if (!tty_hung_up_p(filp))
2339                 info->count--;
2340         spin_unlock_irqrestore(&info->slock, flags);
2341         info->blocked_open++;
2342         while (1) {
2343                 spin_lock_irqsave(&info->slock, flags);
2344                 outb(inb(info->base + UART_MCR) |
2345                         UART_MCR_DTR | UART_MCR_RTS, info->base + UART_MCR);
2346                 spin_unlock_irqrestore(&info->slock, flags);
2347                 set_current_state(TASK_INTERRUPTIBLE);
2348                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)) {
2349                         if (info->flags & ASYNC_HUP_NOTIFY)
2350                                 retval = -EAGAIN;
2351                         else
2352                                 retval = -ERESTARTSYS;
2353                         break;
2354                 }
2355                 if (!(info->flags & ASYNC_CLOSING) &&
2356                                 (do_clocal ||
2357                                 (inb(info->base + UART_MSR) & UART_MSR_DCD)))
2358                         break;
2359                 if (signal_pending(current)) {
2360                         retval = -ERESTARTSYS;
2361                         break;
2362                 }
2363                 schedule();
2364         }
2365         set_current_state(TASK_RUNNING);
2366         remove_wait_queue(&info->open_wait, &wait);
2367         if (!tty_hung_up_p(filp))
2368                 info->count++;
2369         info->blocked_open--;
2370         if (retval)
2371                 return retval;
2372         info->flags |= ASYNC_NORMAL_ACTIVE;
2373         return 0;
2374 }
2375
2376 static int mxser_startup(struct mxser_struct *info)
2377 {
2378         unsigned long page;
2379         unsigned long flags;
2380
2381         page = __get_free_page(GFP_KERNEL);
2382         if (!page)
2383                 return -ENOMEM;
2384
2385         spin_lock_irqsave(&info->slock, flags);
2386
2387         if (info->flags & ASYNC_INITIALIZED) {
2388                 free_page(page);
2389                 spin_unlock_irqrestore(&info->slock, flags);
2390                 return 0;
2391         }
2392
2393         if (!info->base || !info->type) {
2394                 if (info->tty)
2395                         set_bit(TTY_IO_ERROR, &info->tty->flags);
2396                 free_page(page);
2397                 spin_unlock_irqrestore(&info->slock, flags);
2398                 return 0;
2399         }
2400         if (info->xmit_buf)
2401                 free_page(page);
2402         else
2403                 info->xmit_buf = (unsigned char *) page;
2404
2405         /*
2406          * Clear the FIFO buffers and disable them
2407          * (they will be reenabled in mxser_change_speed())
2408          */
2409         if (info->IsMoxaMustChipFlag)
2410                 outb((UART_FCR_CLEAR_RCVR |
2411                         UART_FCR_CLEAR_XMIT |
2412                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->base + UART_FCR);
2413         else
2414                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
2415                         info->base + UART_FCR);
2416
2417         /*
2418          * At this point there's no way the LSR could still be 0xFF;
2419          * if it is, then bail out, because there's likely no UART
2420          * here.
2421          */
2422         if (inb(info->base + UART_LSR) == 0xff) {
2423                 spin_unlock_irqrestore(&info->slock, flags);
2424                 if (capable(CAP_SYS_ADMIN)) {
2425                         if (info->tty)
2426                                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2427                         return 0;
2428                 } else
2429                         return -ENODEV;
2430         }
2431
2432         /*
2433          * Clear the interrupt registers.
2434          */
2435         (void) inb(info->base + UART_LSR);
2436         (void) inb(info->base + UART_RX);
2437         (void) inb(info->base + UART_IIR);
2438         (void) inb(info->base + UART_MSR);
2439
2440         /*
2441          * Now, initialize the UART
2442          */
2443         outb(UART_LCR_WLEN8, info->base + UART_LCR);    /* reset DLAB */
2444         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
2445         outb(info->MCR, info->base + UART_MCR);
2446
2447         /*
2448          * Finally, enable interrupts
2449          */
2450         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
2451         /* info->IER = UART_IER_RLSI | UART_IER_RDI; */
2452
2453         /* following add by Victor Yu. 08-30-2002 */
2454         if (info->IsMoxaMustChipFlag)
2455                 info->IER |= MOXA_MUST_IER_EGDAI;
2456         /* above add by Victor Yu. 08-30-2002 */
2457         outb(info->IER, info->base + UART_IER); /* enable interrupts */
2458
2459         /*
2460          * And clear the interrupt registers again for luck.
2461          */
2462         (void) inb(info->base + UART_LSR);
2463         (void) inb(info->base + UART_RX);
2464         (void) inb(info->base + UART_IIR);
2465         (void) inb(info->base + UART_MSR);
2466
2467         if (info->tty)
2468                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2469         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2470
2471         /*
2472          * and set the speed of the serial port
2473          */
2474         spin_unlock_irqrestore(&info->slock, flags);
2475         mxser_change_speed(info, NULL);
2476
2477         info->flags |= ASYNC_INITIALIZED;
2478         return 0;
2479 }
2480
2481 /*
2482  * This routine will shutdown a serial port; interrupts maybe disabled, and
2483  * DTR is dropped if the hangup on close termio flag is on.
2484  */
2485 static void mxser_shutdown(struct mxser_struct *info)
2486 {
2487         unsigned long flags;
2488
2489         if (!(info->flags & ASYNC_INITIALIZED))
2490                 return;
2491
2492         spin_lock_irqsave(&info->slock, flags);
2493
2494         /*
2495          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
2496          * here so the queue might never be waken up
2497          */
2498         wake_up_interruptible(&info->delta_msr_wait);
2499
2500         /*
2501          * Free the IRQ, if necessary
2502          */
2503         if (info->xmit_buf) {
2504                 free_page((unsigned long) info->xmit_buf);
2505                 info->xmit_buf = NULL;
2506         }
2507
2508         info->IER = 0;
2509         outb(0x00, info->base + UART_IER);
2510
2511         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
2512                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
2513         outb(info->MCR, info->base + UART_MCR);
2514
2515         /* clear Rx/Tx FIFO's */
2516         /* following add by Victor Yu. 08-30-2002 */
2517         if (info->IsMoxaMustChipFlag)
2518                 outb((UART_FCR_CLEAR_RCVR |
2519                         UART_FCR_CLEAR_XMIT |
2520                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->base + UART_FCR);
2521         else
2522                 /* above add by Victor Yu. 08-30-2002 */
2523                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
2524                         info->base + UART_FCR);
2525
2526         /* read data port to reset things */
2527         (void) inb(info->base + UART_RX);
2528
2529         if (info->tty)
2530                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2531
2532         info->flags &= ~ASYNC_INITIALIZED;
2533
2534         /* following add by Victor Yu. 09-23-2002 */
2535         if (info->IsMoxaMustChipFlag)
2536                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->base);
2537         /* above add by Victor Yu. 09-23-2002 */
2538
2539         spin_unlock_irqrestore(&info->slock, flags);
2540 }
2541
2542 /*
2543  * This routine is called to set the UART divisor registers to match
2544  * the specified baud rate for a serial port.
2545  */
2546 static int mxser_change_speed(struct mxser_struct *info, struct ktermios *old_termios)
2547 {
2548         unsigned cflag, cval, fcr;
2549         int ret = 0;
2550         unsigned char status;
2551         long baud;
2552         unsigned long flags;
2553
2554         if (!info->tty || !info->tty->termios)
2555                 return ret;
2556         cflag = info->tty->termios->c_cflag;
2557         if (!(info->base))
2558                 return ret;
2559
2560 #ifndef B921600
2561 #define B921600 (B460800 +1)
2562 #endif
2563         if (mxser_set_baud_method[info->port] == 0) {
2564                 baud = tty_get_baud_rate(info->tty);
2565                 mxser_set_baud(info, baud);
2566         }
2567
2568         /* byte size and parity */
2569         switch (cflag & CSIZE) {
2570         case CS5:
2571                 cval = 0x00;
2572                 break;
2573         case CS6:
2574                 cval = 0x01;
2575                 break;
2576         case CS7:
2577                 cval = 0x02;
2578                 break;
2579         case CS8:
2580                 cval = 0x03;
2581                 break;
2582         default:
2583                 cval = 0x00;
2584                 break;          /* too keep GCC shut... */
2585         }
2586         if (cflag & CSTOPB)
2587                 cval |= 0x04;
2588         if (cflag & PARENB)
2589                 cval |= UART_LCR_PARITY;
2590         if (!(cflag & PARODD))
2591                 cval |= UART_LCR_EPAR;
2592         if (cflag & CMSPAR)
2593                 cval |= UART_LCR_SPAR;
2594
2595         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
2596                 if (info->IsMoxaMustChipFlag) {
2597                         fcr = UART_FCR_ENABLE_FIFO;
2598                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
2599                         SET_MOXA_MUST_FIFO_VALUE(info);
2600                 } else
2601                         fcr = 0;
2602         } else {
2603                 fcr = UART_FCR_ENABLE_FIFO;
2604                 /* following add by Victor Yu. 08-30-2002 */
2605                 if (info->IsMoxaMustChipFlag) {
2606                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
2607                         SET_MOXA_MUST_FIFO_VALUE(info);
2608                 } else {
2609                         /* above add by Victor Yu. 08-30-2002 */
2610                         switch (info->rx_trigger) {
2611                         case 1:
2612                                 fcr |= UART_FCR_TRIGGER_1;
2613                                 break;
2614                         case 4:
2615                                 fcr |= UART_FCR_TRIGGER_4;
2616                                 break;
2617                         case 8:
2618                                 fcr |= UART_FCR_TRIGGER_8;
2619                                 break;
2620                         default:
2621                                 fcr |= UART_FCR_TRIGGER_14;
2622                                 break;
2623                         }
2624                 }
2625         }
2626
2627         /* CTS flow control flag and modem status interrupts */
2628         info->IER &= ~UART_IER_MSI;
2629         info->MCR &= ~UART_MCR_AFE;
2630         if (cflag & CRTSCTS) {
2631                 info->flags |= ASYNC_CTS_FLOW;
2632                 info->IER |= UART_IER_MSI;
2633                 if ((info->type == PORT_16550A) || (info->IsMoxaMustChipFlag)) {
2634                         info->MCR |= UART_MCR_AFE;
2635                         /* status = mxser_get_msr(info->base, 0, info->port); */
2636 /*
2637         save_flags(flags);
2638         cli();
2639         status = inb(baseaddr + UART_MSR);
2640         restore_flags(flags);
2641 */
2642                         /* mxser_check_modem_status(info, status); */
2643                 } else {
2644                         /* status = mxser_get_msr(info->base, 0, info->port); */
2645                         /* MX_LOCK(&info->slock); */
2646                         status = inb(info->base + UART_MSR);
2647                         /* MX_UNLOCK(&info->slock); */
2648                         if (info->tty->hw_stopped) {
2649                                 if (status & UART_MSR_CTS) {
2650                                         info->tty->hw_stopped = 0;
2651                                         if ((info->type != PORT_16550A) &&
2652                                                         (!info->IsMoxaMustChipFlag)) {
2653                                                 info->IER |= UART_IER_THRI;
2654                                                 outb(info->IER, info->base + UART_IER);
2655                                         }
2656                                         set_bit(MXSER_EVENT_TXLOW, &info->event);
2657                                         schedule_work(&info->tqueue);                           }
2658                         } else {
2659                                 if (!(status & UART_MSR_CTS)) {
2660                                         info->tty->hw_stopped = 1;
2661                                         if ((info->type != PORT_16550A) &&
2662                                                         (!info->IsMoxaMustChipFlag)) {
2663                                                 info->IER &= ~UART_IER_THRI;
2664                                                 outb(info->IER, info->base + UART_IER);
2665                                         }
2666                                 }
2667                         }
2668                 }
2669         } else {
2670                 info->flags &= ~ASYNC_CTS_FLOW;
2671         }
2672         outb(info->MCR, info->base + UART_MCR);
2673         if (cflag & CLOCAL) {
2674                 info->flags &= ~ASYNC_CHECK_CD;
2675         } else {
2676                 info->flags |= ASYNC_CHECK_CD;
2677                 info->IER |= UART_IER_MSI;
2678         }
2679         outb(info->IER, info->base + UART_IER);
2680
2681         /*
2682          * Set up parity check flag
2683          */
2684         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
2685         if (I_INPCK(info->tty))
2686                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
2687         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2688                 info->read_status_mask |= UART_LSR_BI;
2689
2690         info->ignore_status_mask = 0;
2691
2692         if (I_IGNBRK(info->tty)) {
2693                 info->ignore_status_mask |= UART_LSR_BI;
2694                 info->read_status_mask |= UART_LSR_BI;
2695                 /*
2696                  * If we're ignore parity and break indicators, ignore
2697                  * overruns too.  (For real raw support).
2698                  */
2699                 if (I_IGNPAR(info->tty)) {
2700                         info->ignore_status_mask |=
2701                                                 UART_LSR_OE |
2702                                                 UART_LSR_PE |
2703                                                 UART_LSR_FE;
2704                         info->read_status_mask |=
2705                                                 UART_LSR_OE |
2706                                                 UART_LSR_PE |
2707                                                 UART_LSR_FE;
2708                 }
2709         }
2710         /* following add by Victor Yu. 09-02-2002 */
2711         if (info->IsMoxaMustChipFlag) {
2712                 spin_lock_irqsave(&info->slock, flags);
2713                 SET_MOXA_MUST_XON1_VALUE(info->base, START_CHAR(info->tty));
2714                 SET_MOXA_MUST_XOFF1_VALUE(info->base, STOP_CHAR(info->tty));
2715                 if (I_IXON(info->tty)) {
2716                         ENABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base);
2717                 } else {
2718                         DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base);
2719                 }
2720                 if (I_IXOFF(info->tty)) {
2721                         ENABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->base);
2722                 } else {
2723                         DISABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->base);
2724                 }
2725                 /*
2726                    if ( I_IXANY(info->tty) ) {
2727                    info->MCR |= MOXA_MUST_MCR_XON_ANY;
2728                    ENABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->base);
2729                    } else {
2730                    info->MCR &= ~MOXA_MUST_MCR_XON_ANY;
2731                    DISABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->base);
2732                    }
2733                  */
2734                 spin_unlock_irqrestore(&info->slock, flags);
2735         }
2736         /* above add by Victor Yu. 09-02-2002 */
2737
2738
2739         outb(fcr, info->base + UART_FCR);       /* set fcr */
2740         outb(cval, info->base + UART_LCR);
2741
2742         return ret;
2743 }
2744
2745
2746 static int mxser_set_baud(struct mxser_struct *info, long newspd)
2747 {
2748         int quot = 0;
2749         unsigned char cval;
2750         int ret = 0;
2751         unsigned long flags;
2752
2753         if (!info->tty || !info->tty->termios)
2754                 return ret;
2755
2756         if (!(info->base))
2757                 return ret;
2758
2759         if (newspd > info->MaxCanSetBaudRate)
2760                 return 0;
2761
2762         info->realbaud = newspd;
2763         if (newspd == 134) {
2764                 quot = (2 * info->baud_base / 269);
2765         } else if (newspd) {
2766                 quot = info->baud_base / newspd;
2767                 if (quot == 0)
2768                         quot = 1;
2769         } else {
2770                 quot = 0;
2771         }
2772
2773         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
2774         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
2775
2776         if (quot) {
2777                 spin_lock_irqsave(&info->slock, flags);
2778                 info->MCR |= UART_MCR_DTR;
2779                 outb(info->MCR, info->base + UART_MCR);
2780                 spin_unlock_irqrestore(&info->slock, flags);
2781         } else {
2782                 spin_lock_irqsave(&info->slock, flags);
2783                 info->MCR &= ~UART_MCR_DTR;
2784                 outb(info->MCR, info->base + UART_MCR);
2785                 spin_unlock_irqrestore(&info->slock, flags);
2786                 return ret;
2787         }
2788
2789         cval = inb(info->base + UART_LCR);
2790
2791         outb(cval | UART_LCR_DLAB, info->base + UART_LCR);      /* set DLAB */
2792
2793         outb(quot & 0xff, info->base + UART_DLL);       /* LS of divisor */
2794         outb(quot >> 8, info->base + UART_DLM); /* MS of divisor */
2795         outb(cval, info->base + UART_LCR);      /* reset DLAB */
2796
2797
2798         return ret;
2799 }
2800
2801 /*
2802  * ------------------------------------------------------------
2803  * friends of mxser_ioctl()
2804  * ------------------------------------------------------------
2805  */
2806 static int mxser_get_serial_info(struct mxser_struct *info, struct serial_struct __user *retinfo)
2807 {
2808         struct serial_struct tmp;
2809
2810         if (!retinfo)
2811                 return -EFAULT;
2812         memset(&tmp, 0, sizeof(tmp));
2813         tmp.type = info->type;
2814         tmp.line = info->port;
2815         tmp.port = info->base;
2816         tmp.irq = info->irq;
2817         tmp.flags = info->flags;
2818         tmp.baud_base = info->baud_base;
2819         tmp.close_delay = info->close_delay;
2820         tmp.closing_wait = info->closing_wait;
2821         tmp.custom_divisor = info->custom_divisor;
2822         tmp.hub6 = 0;
2823         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2824                 return -EFAULT;
2825         return 0;
2826 }
2827
2828 static int mxser_set_serial_info(struct mxser_struct *info, struct serial_struct __user *new_info)
2829 {
2830         struct serial_struct new_serial;
2831         unsigned int flags;
2832         int retval = 0;
2833
2834         if (!new_info || !info->base)
2835                 return -EFAULT;
2836         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2837                 return -EFAULT;
2838
2839         if ((new_serial.irq != info->irq) ||
2840                         (new_serial.port != info->base) ||
2841                         (new_serial.custom_divisor != info->custom_divisor) ||
2842                         (new_serial.baud_base != info->baud_base))
2843                 return -EPERM;
2844
2845         flags = info->flags & ASYNC_SPD_MASK;
2846
2847         if (!capable(CAP_SYS_ADMIN)) {
2848                 if ((new_serial.baud_base != info->baud_base) ||
2849                                 (new_serial.close_delay != info->close_delay) ||
2850                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK)))
2851                         return -EPERM;
2852                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
2853                                 (new_serial.flags & ASYNC_USR_MASK));
2854         } else {
2855                 /*
2856                  * OK, past this point, all the error checking has been done.
2857                  * At this point, we start making changes.....
2858                  */
2859                 info->flags = ((info->flags & ~ASYNC_FLAGS) |
2860                                 (new_serial.flags & ASYNC_FLAGS));
2861                 info->close_delay = new_serial.close_delay * HZ / 100;
2862                 info->closing_wait = new_serial.closing_wait * HZ / 100;
2863                 info->tty->low_latency =
2864                                 (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2865                 info->tty->low_latency = 0;     /* (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; */
2866         }
2867
2868         /* added by casper, 3/17/2000, for mouse */
2869         info->type = new_serial.type;
2870
2871         process_txrx_fifo(info);
2872
2873         if (info->flags & ASYNC_INITIALIZED) {
2874                 if (flags != (info->flags & ASYNC_SPD_MASK)) {
2875                         mxser_change_speed(info, NULL);
2876                 }
2877         } else {
2878                 retval = mxser_startup(info);
2879         }
2880         return retval;
2881 }
2882
2883 /*
2884  * mxser_get_lsr_info - get line status register info
2885  *
2886  * Purpose: Let user call ioctl() to get info when the UART physically
2887  *          is emptied.  On bus types like RS485, the transmitter must
2888  *          release the bus after transmitting. This must be done when
2889  *          the transmit shift register is empty, not be done when the
2890  *          transmit holding register is empty.  This functionality
2891  *          allows an RS485 driver to be written in user space.
2892  */
2893 static int mxser_get_lsr_info(struct mxser_struct *info, unsigned int __user *value)
2894 {
2895         unsigned char status;
2896         unsigned int result;
2897         unsigned long flags;
2898
2899         spin_lock_irqsave(&info->slock, flags);
2900         status = inb(info->base + UART_LSR);
2901         spin_unlock_irqrestore(&info->slock, flags);
2902         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
2903         return put_user(result, value);
2904 }
2905
2906 /*
2907  * This routine sends a break character out the serial port.
2908  */
2909 static void mxser_send_break(struct mxser_struct *info, int duration)
2910 {
2911         unsigned long flags;
2912
2913         if (!info->base)
2914                 return;
2915         set_current_state(TASK_INTERRUPTIBLE);
2916         spin_lock_irqsave(&info->slock, flags);
2917         outb(inb(info->base + UART_LCR) | UART_LCR_SBC,
2918                 info->base + UART_LCR);
2919         spin_unlock_irqrestore(&info->slock, flags);
2920         schedule_timeout(duration);
2921         spin_lock_irqsave(&info->slock, flags);
2922         outb(inb(info->base + UART_LCR) & ~UART_LCR_SBC,
2923                 info->base + UART_LCR);
2924         spin_unlock_irqrestore(&info->slock, flags);
2925 }
2926
2927 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
2928 {
2929         struct mxser_struct *info = tty->driver_data;
2930         unsigned char control, status;
2931         unsigned long flags;
2932
2933
2934         if (tty->index == MXSER_PORTS)
2935                 return -ENOIOCTLCMD;
2936         if (tty->flags & (1 << TTY_IO_ERROR))
2937                 return -EIO;
2938
2939         control = info->MCR;
2940
2941         spin_lock_irqsave(&info->slock, flags);
2942         status = inb(info->base + UART_MSR);
2943         if (status & UART_MSR_ANY_DELTA)
2944                 mxser_check_modem_status(info, status);
2945         spin_unlock_irqrestore(&info->slock, flags);
2946         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
2947                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
2948                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
2949                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
2950                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
2951                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
2952 }
2953
2954 static int mxser_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear)
2955 {
2956         struct mxser_struct *info = tty->driver_data;
2957         unsigned long flags;
2958
2959
2960         if (tty->index == MXSER_PORTS)
2961                 return -ENOIOCTLCMD;
2962         if (tty->flags & (1 << TTY_IO_ERROR))
2963                 return -EIO;
2964
2965         spin_lock_irqsave(&info->slock, flags);
2966
2967         if (set & TIOCM_RTS)
2968                 info->MCR |= UART_MCR_RTS;
2969         if (set & TIOCM_DTR)
2970                 info->MCR |= UART_MCR_DTR;
2971
2972         if (clear & TIOCM_RTS)
2973                 info->MCR &= ~UART_MCR_RTS;
2974         if (clear & TIOCM_DTR)
2975                 info->MCR &= ~UART_MCR_DTR;
2976
2977         outb(info->MCR, info->base + UART_MCR);
2978         spin_unlock_irqrestore(&info->slock, flags);
2979         return 0;
2980 }
2981
2982
2983 static int mxser_read_register(int, unsigned short *);
2984 static int mxser_program_mode(int);
2985 static void mxser_normal_mode(int);
2986
2987 static int mxser_get_ISA_conf(int cap, struct mxser_hwconf *hwconf)
2988 {
2989         int id, i, bits;
2990         unsigned short regs[16], irq;
2991         unsigned char scratch, scratch2;
2992
2993         hwconf->IsMoxaMustChipFlag = MOXA_OTHER_UART;
2994
2995         id = mxser_read_register(cap, regs);
2996         if (id == C168_ASIC_ID) {
2997                 hwconf->board_type = MXSER_BOARD_C168_ISA;
2998                 hwconf->ports = 8;
2999         } else if (id == C104_ASIC_ID) {
3000                 hwconf->board_type = MXSER_BOARD_C104_ISA;
3001                 hwconf->ports = 4;
3002         } else if (id == C102_ASIC_ID) {
3003                 hwconf->board_type = MXSER_BOARD_C102_ISA;
3004                 hwconf->ports = 2;
3005         } else if (id == CI132_ASIC_ID) {
3006                 hwconf->board_type = MXSER_BOARD_CI132;
3007                 hwconf->ports = 2;
3008         } else if (id == CI134_ASIC_ID) {
3009                 hwconf->board_type = MXSER_BOARD_CI134;
3010                 hwconf->ports = 4;
3011         } else if (id == CI104J_ASIC_ID) {
3012                 hwconf->board_type = MXSER_BOARD_CI104J;
3013                 hwconf->ports = 4;
3014         } else
3015                 return 0;
3016
3017         irq = 0;
3018         if (hwconf->ports == 2) {
3019                 irq = regs[9] & 0xF000;
3020                 irq = irq | (irq >> 4);
3021                 if (irq != (regs[9] & 0xFF00))
3022                         return MXSER_ERR_IRQ_CONFLIT;
3023         } else if (hwconf->ports == 4) {
3024                 irq = regs[9] & 0xF000;
3025                 irq = irq | (irq >> 4);
3026                 irq = irq | (irq >> 8);
3027                 if (irq != regs[9])
3028                         return MXSER_ERR_IRQ_CONFLIT;
3029         } else if (hwconf->ports == 8) {
3030                 irq = regs[9] & 0xF000;
3031                 irq = irq | (irq >> 4);
3032                 irq = irq | (irq >> 8);
3033                 if ((irq != regs[9]) || (irq != regs[10]))
3034                         return MXSER_ERR_IRQ_CONFLIT;
3035         }
3036
3037         if (!irq)
3038                 return MXSER_ERR_IRQ;
3039         hwconf->irq = ((int)(irq & 0xF000) >> 12);
3040         for (i = 0; i < 8; i++)
3041                 hwconf->ioaddr[i] = (int) regs[i + 1] & 0xFFF8;
3042         if ((regs[12] & 0x80) == 0)
3043                 return MXSER_ERR_VECTOR;
3044         hwconf->vector = (int)regs[11]; /* interrupt vector */
3045         if (id == 1)
3046                 hwconf->vector_mask = 0x00FF;
3047         else
3048                 hwconf->vector_mask = 0x000F;
3049         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
3050                 if (regs[12] & bits) {
3051                         hwconf->baud_base[i] = 921600;
3052                         hwconf->MaxCanSetBaudRate[i] = 921600;  /* add by Victor Yu. 09-04-2002 */
3053                 } else {
3054                         hwconf->baud_base[i] = 115200;
3055                         hwconf->MaxCanSetBaudRate[i] = 115200;  /* add by Victor Yu. 09-04-2002 */
3056                 }
3057         }
3058         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
3059         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
3060         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
3061         outb(scratch2, cap + UART_LCR);
3062         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
3063         scratch = inb(cap + UART_IIR);
3064
3065         if (scratch & 0xC0)
3066                 hwconf->uart_type = PORT_16550A;
3067         else
3068                 hwconf->uart_type = PORT_16450;
3069         if (id == 1)
3070                 hwconf->ports = 8;
3071         else
3072                 hwconf->ports = 4;
3073         request_region(hwconf->ioaddr[0], 8 * hwconf->ports, "mxser(IO)");
3074         request_region(hwconf->vector, 1, "mxser(vector)");
3075         return hwconf->ports;
3076 }
3077
3078 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
3079 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
3080 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
3081 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
3082 #define EN_CCMD         0x000   /* Chip's command register     */
3083 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
3084 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
3085 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
3086 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
3087 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
3088 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
3089 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
3090 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
3091 static int mxser_read_register(int port, unsigned short *regs)
3092 {
3093         int i, k, value, id;
3094         unsigned int j;
3095
3096         id = mxser_program_mode(port);
3097         if (id < 0)
3098                 return id;
3099         for (i = 0; i < 14; i++) {
3100                 k = (i & 0x3F) | 0x180;
3101                 for (j = 0x100; j > 0; j >>= 1) {
3102                         outb(CHIP_CS, port);
3103                         if (k & j) {
3104                                 outb(CHIP_CS | CHIP_DO, port);
3105                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
3106                         } else {
3107                                 outb(CHIP_CS, port);
3108                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
3109                         }
3110                 }
3111                 (void)inb(port);
3112                 value = 0;
3113                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
3114                         outb(CHIP_CS, port);
3115                         outb(CHIP_CS | CHIP_SK, port);
3116                         if (inb(port) & CHIP_DI)
3117                                 value |= j;
3118                 }
3119                 regs[i] = value;
3120                 outb(0, port);
3121         }
3122         mxser_normal_mode(port);
3123         return id;
3124 }
3125
3126 static int mxser_program_mode(int port)
3127 {
3128         int id, i, j, n;
3129         /* unsigned long flags; */
3130
3131         spin_lock(&gm_lock);
3132         outb(0, port);
3133         outb(0, port);
3134         outb(0, port);
3135         (void)inb(port);
3136         (void)inb(port);
3137         outb(0, port);
3138         (void)inb(port);
3139         /* restore_flags(flags); */
3140         spin_unlock(&gm_lock);
3141
3142         id = inb(port + 1) & 0x1F;
3143         if ((id != C168_ASIC_ID) &&
3144                         (id != C104_ASIC_ID) &&
3145                         (id != C102_ASIC_ID) &&
3146                         (id != CI132_ASIC_ID) &&
3147                         (id != CI134_ASIC_ID) &&
3148                         (id != CI104J_ASIC_ID))
3149                 return -1;
3150         for (i = 0, j = 0; i < 4; i++) {
3151                 n = inb(port + 2);
3152                 if (n == 'M') {
3153                         j = 1;
3154                 } else if ((j == 1) && (n == 1)) {
3155                         j = 2;
3156                         break;
3157                 } else
3158                         j = 0;
3159         }
3160         if (j != 2)
3161                 id = -2;
3162         return id;
3163 }
3164
3165 static void mxser_normal_mode(int port)
3166 {
3167         int i, n;
3168
3169         outb(0xA5, port + 1);
3170         outb(0x80, port + 3);
3171         outb(12, port + 0);     /* 9600 bps */
3172         outb(0, port + 1);
3173         outb(0x03, port + 3);   /* 8 data bits */
3174         outb(0x13, port + 4);   /* loop back mode */
3175         for (i = 0; i < 16; i++) {
3176                 n = inb(port + 5);
3177                 if ((n & 0x61) == 0x60)
3178                         break;
3179                 if ((n & 1) == 1)
3180                         (void)inb(port);
3181         }
3182         outb(0x00, port + 4);
3183 }
3184
3185 module_init(mxser_module_init);
3186 module_exit(mxser_module_exit);