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