drivers/char/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2001  Moxa Technologies (support@moxa.com.tw).
   5  *
   6  *      This code is loosely based on the Linux serial driver, written by
   7  *      Linus Torvalds, Theodore T'so and others.
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  *      This program is distributed in the hope that it will be useful,
  15  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *      GNU General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License
  20  *      along with this program; if not, write to the Free Software
  21  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  *      Original release        10/26/00
  24  *
  25  *      02/06/01        Support MOXA Industio family boards.
  26  *      02/06/01        Support TIOCGICOUNT.
  27  *      02/06/01        Fix the problem for connecting to serial mouse.
  28  *      02/06/01        Fix the problem for H/W flow control.
  29  *      02/06/01        Fix the compling warning when CONFIG_PCI
  30  *                      don't be defined.
  31  *
  32  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  33  *      <alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
  34  *      - Fixed x86_64 cleanness
  35  *      - Fixed sleep with spinlock held in mxser_send_break
  36  */
  37
  38
  39 #include <linux/module.h>
  40 #include <linux/autoconf.h>
  41 #include <linux/errno.h>
  42 #include <linux/signal.h>
  43 #include <linux/sched.h>
  44 #include <linux/timer.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/tty.h>
  47 #include <linux/tty_flip.h>
  48 #include <linux/serial.h>
  49 #include <linux/serial_reg.h>
  50 #include <linux/major.h>
  51 #include <linux/string.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/ptrace.h>
  54 #include <linux/gfp.h>
  55 #include <linux/ioport.h>
  56 #include <linux/mm.h>
  57 #include <linux/smp_lock.h>
  58 #include <linux/delay.h>
  59 #include <linux/pci.h>
  60
  61 #include <asm/system.h>
  62 #include <asm/io.h>
  63 #include <asm/irq.h>
  64 #include <asm/bitops.h>
  65 #include <asm/uaccess.h>
  66
  67 #include "mxser.h"
  68
  69 #define MXSER_VERSION   "1.8"
  70 #define MXSERMAJOR       174
  71 #define MXSERCUMAJOR     175
  72
  73 #define MXSER_EVENT_TXLOW       1
  74 #define MXSER_EVENT_HANGUP      2
  75
  76 #define MXSER_BOARDS            4       /* Max. boards */
  77 #define MXSER_PORTS             32      /* Max. ports */
  78 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  79 #define MXSER_ISR_PASS_LIMIT    256
  80
  81 #define MXSER_ERR_IOADDR        -1
  82 #define MXSER_ERR_IRQ           -2
  83 #define MXSER_ERR_IRQ_CONFLIT   -3
  84 #define MXSER_ERR_VECTOR        -4
  85
  86 #define SERIAL_TYPE_NORMAL      1
  87 #define SERIAL_TYPE_CALLOUT     2
  88
  89 #define WAKEUP_CHARS            256
  90
  91 #define UART_MCR_AFE            0x20
  92 #define UART_LSR_SPECIAL        0x1E
  93
  94 #define RELEVANT_IFLAG(iflag)   (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|\
  95                                           IXON|IXOFF))
  96
  97 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)
  98
  99 #define C168_ASIC_ID    1
 100 #define C104_ASIC_ID    2
 101 #define C102_ASIC_ID    0xB
 102 #define CI132_ASIC_ID   4
 103 #define CI134_ASIC_ID   3
 104 #define CI104J_ASIC_ID  5
 105
 106 enum {
 107         MXSER_BOARD_C168_ISA = 1,
 108         MXSER_BOARD_C104_ISA,
 109         MXSER_BOARD_CI104J,
 110         MXSER_BOARD_C168_PCI,
 111         MXSER_BOARD_C104_PCI,
 112         MXSER_BOARD_C102_ISA,
 113         MXSER_BOARD_CI132,
 114         MXSER_BOARD_CI134,
 115         MXSER_BOARD_CP132,
 116         MXSER_BOARD_CP114,
 117         MXSER_BOARD_CT114,
 118         MXSER_BOARD_CP102,
 119         MXSER_BOARD_CP104U,
 120         MXSER_BOARD_CP168U,
 121         MXSER_BOARD_CP132U,
 122         MXSER_BOARD_CP134U,
 123         MXSER_BOARD_CP104JU,
 124         MXSER_BOARD_RC7000,
 125         MXSER_BOARD_CP118U,
 126         MXSER_BOARD_CP102UL,
 127         MXSER_BOARD_CP102U,
 128 };
 129
 130 static char *mxser_brdname[] = {
 131         "C168 series",
 132         "C104 series",
 133         "CI-104J series",
 134         "C168H/PCI series",
 135         "C104H/PCI series",
 136         "C102 series",
 137         "CI-132 series",
 138         "CI-134 series",
 139         "CP-132 series",
 140         "CP-114 series",
 141         "CT-114 series",
 142         "CP-102 series",
 143         "CP-104U series",
 144         "CP-168U series",
 145         "CP-132U series",
 146         "CP-134U series",
 147         "CP-104JU series",
 148         "Moxa UC7000 Serial",
 149         "CP-118U series",
 150         "CP-102UL series",
 151         "CP-102U series",
 152 };
 153
 154 static int mxser_numports[] = {
 155         8,                      /* C168-ISA */
 156         4,                      /* C104-ISA */
 157         4,                      /* CI104J */
 158         8,                      /* C168-PCI */
 159         4,                      /* C104-PCI */
 160         2,                      /* C102-ISA */
 161         2,                      /* CI132 */
 162         4,                      /* CI134 */
 163         2,                      /* CP132 */
 164         4,                      /* CP114 */
 165         4,                      /* CT114 */
 166         2,                      /* CP102 */
 167         4,                      /* CP104U */
 168         8,                      /* CP168U */
 169         2,                      /* CP132U */
 170         4,                      /* CP134U */
 171         4,                      /* CP104JU */
 172         8,                      /* RC7000 */
 173         8,                      /* CP118U */
 174         2,                      /* CP102UL */
 175         2,                      /* CP102U */
 176 };
 177
 178 #define UART_TYPE_NUM   2
 179
 180 static const unsigned int Gmoxa_uart_id[UART_TYPE_NUM] = {
 181         MOXA_MUST_MU150_HWID,
 182         MOXA_MUST_MU860_HWID
 183 };
 184
 185 /* This is only for PCI */
 186 #define UART_INFO_NUM   3
 187 struct mxpciuart_info {
 188         int type;
 189         int tx_fifo;
 190         int rx_fifo;
 191         int xmit_fifo_size;
 192         int rx_high_water;
 193         int rx_trigger;
 194         int rx_low_water;
 195         long max_baud;
 196 };
 197
 198 static const struct mxpciuart_info Gpci_uart_info[UART_INFO_NUM] = {
 199         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 200         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 201         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 202 };
 203
 204
 205 #ifdef CONFIG_PCI
 206
 207 static struct pci_device_id mxser_pcibrds[] = {
 208         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C168, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_C168_PCI},
 209         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C104, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_C104_PCI},
 210         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP132},
 211         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP114},
 212         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CT114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CT114},
 213         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102},
 214         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP104U},
 215         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP168U},
 216         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP132U},
 217         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP134U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP134U},
 218         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104JU, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP104JU},
 219         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_RC7000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_RC7000},
 220         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP118U},
 221         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102UL, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102UL},
 222         {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102U},
 223         {0}
 224 };
 225
 226 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 227
 228
 229 #endif
 230
 231 typedef struct _moxa_pci_info {
 232         unsigned short busNum;
 233         unsigned short devNum;
 234         struct pci_dev *pdev;   /* add by Victor Yu. 06-23-2003 */
 235 } moxa_pci_info;
 236
 237 static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
 238 static int ttymajor = MXSERMAJOR;
 239 static int calloutmajor = MXSERCUMAJOR;
 240 static int verbose = 0;
 241
 242 /* Variables for insmod */
 243
 244 MODULE_AUTHOR("Casper Yang");
 245 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 246 module_param_array(ioaddr, int, NULL, 0);
 247 module_param(ttymajor, int, 0);
 248 module_param(calloutmajor, int, 0);
 249 module_param(verbose, bool, 0);
 250 MODULE_LICENSE("GPL");
 251
 252 struct mxser_log {
 253         int tick;
 254         unsigned long rxcnt[MXSER_PORTS];
 255         unsigned long txcnt[MXSER_PORTS];
 256 };
 257
 258
 259 struct mxser_mon {
 260         unsigned long rxcnt;
 261         unsigned long txcnt;
 262         unsigned long up_rxcnt;
 263         unsigned long up_txcnt;
 264         int modem_status;
 265         unsigned char hold_reason;
 266 };
 267
 268 struct mxser_mon_ext {
 269         unsigned long rx_cnt[32];
 270         unsigned long tx_cnt[32];
 271         unsigned long up_rxcnt[32];
 272         unsigned long up_txcnt[32];
 273         int modem_status[32];
 274
 275         long baudrate[32];
 276         int databits[32];
 277         int stopbits[32];
 278         int parity[32];
 279         int flowctrl[32];
 280         int fifo[32];
 281         int iftype[32];
 282 };
 283
 284 struct mxser_hwconf {
 285         int board_type;
 286         int ports;
 287         int irq;
 288         int vector;
 289         int vector_mask;
 290         int uart_type;
 291         int ioaddr[MXSER_PORTS_PER_BOARD];
 292         int baud_base[MXSER_PORTS_PER_BOARD];
 293         moxa_pci_info pciInfo;
 294         int IsMoxaMustChipFlag; /* add by Victor Yu. 08-30-2002 */
 295         int MaxCanSetBaudRate[MXSER_PORTS_PER_BOARD];   /* add by Victor Yu. 09-04-2002 */
 296         int opmode_ioaddr[MXSER_PORTS_PER_BOARD];       /* add by Victor Yu. 01-05-2004 */
 297 };
 298
 299 struct mxser_struct {
 300         int port;
 301         int base;               /* port base address */
 302         int irq;                /* port using irq no. */
 303         int vector;             /* port irq vector */
 304         int vectormask;         /* port vector mask */
 305         int rx_high_water;
 306         int rx_trigger;         /* Rx fifo trigger level */
 307         int rx_low_water;
 308         int baud_base;          /* max. speed */
 309         int flags;              /* defined in tty.h */
 310         int type;               /* UART type */
 311         struct tty_struct *tty;
 312         int read_status_mask;
 313         int ignore_status_mask;
 314         int xmit_fifo_size;
 315         int custom_divisor;
 316         int x_char;             /* xon/xoff character */
 317         int close_delay;
 318         unsigned short closing_wait;
 319         int IER;                /* Interrupt Enable Register */
 320         int MCR;                /* Modem control register */
 321         unsigned long event;
 322         int count;              /* # of fd on device */
 323         int blocked_open;       /* # of blocked opens */
 324         long session;           /* Session of opening process */
 325         long pgrp;              /* pgrp of opening process */
 326         unsigned char *xmit_buf;
 327         int xmit_head;
 328         int xmit_tail;
 329         int xmit_cnt;
 330         struct work_struct tqueue;
 331         struct ktermios normal_termios;
 332         struct ktermios callout_termios;
 333         wait_queue_head_t open_wait;
 334         wait_queue_head_t close_wait;
 335         wait_queue_head_t delta_msr_wait;
 336         struct async_icount icount;     /* kernel counters for the 4 input interrupts */
 337         int timeout;
 338         int IsMoxaMustChipFlag; /* add by Victor Yu. 08-30-2002 */
 339         int MaxCanSetBaudRate;  /* add by Victor Yu. 09-04-2002 */
 340         int opmode_ioaddr;      /* add by Victor Yu. 01-05-2004 */
 341         unsigned char stop_rx;
 342         unsigned char ldisc_stop_rx;
 343         long realbaud;
 344         struct mxser_mon mon_data;
 345         unsigned char err_shadow;
 346         spinlock_t slock;
 347 };
 348
 349 struct mxser_mstatus {
 350         tcflag_t cflag;
 351         int cts;
 352         int dsr;
 353         int ri;
 354         int dcd;
 355 };
 356
 357 static struct mxser_mstatus GMStatus[MXSER_PORTS];
 358
 359 static int mxserBoardCAP[MXSER_BOARDS] = {
 360         0, 0, 0, 0
 361         /*  0x180, 0x280, 0x200, 0x320 */
 362 };
 363
 364 static struct tty_driver *mxvar_sdriver;
 365 static struct mxser_struct mxvar_table[MXSER_PORTS];
 366 static struct tty_struct *mxvar_tty[MXSER_PORTS + 1];
 367 static struct ktermios *mxvar_termios[MXSER_PORTS + 1];
 368 static struct ktermios *mxvar_termios_locked[MXSER_PORTS + 1];
 369 static struct mxser_log mxvar_log;
 370 static int mxvar_diagflag;
 371 static unsigned char mxser_msr[MXSER_PORTS + 1];
 372 static struct mxser_mon_ext mon_data_ext;
 373 static int mxser_set_baud_method[MXSER_PORTS + 1];
 374 static spinlock_t gm_lock;
 375
 376 /*
 377  * This is used to figure out the divisor speeds and the timeouts
 378  */
 379
 380 static struct mxser_hwconf mxsercfg[MXSER_BOARDS];
 381
 382 /*
 383  * static functions:
 384  */
 385
 386 static void mxser_getcfg(int board, struct mxser_hwconf *hwconf);
 387 static int mxser_init(void);
 388
 389 /* static void   mxser_poll(unsigned long); */
 390 static int mxser_get_ISA_conf(int, struct mxser_hwconf *);
 391 static int mxser_get_PCI_conf(int, int, int, struct mxser_hwconf *);
 392 static void mxser_do_softint(struct work_struct *);
 393 static int mxser_open(struct tty_struct *, struct file *);
 394 static void mxser_close(struct tty_struct *, struct file *);
 395 static int mxser_write(struct tty_struct *, const unsigned char *, int);
 396 static int mxser_write_room(struct tty_struct *);
 397 static void mxser_flush_buffer(struct tty_struct *);
 398 static int mxser_chars_in_buffer(struct tty_struct *);
 399 static void mxser_flush_chars(struct tty_struct *);
 400 static void mxser_put_char(struct tty_struct *, unsigned char);
 401 static int mxser_ioctl(struct tty_struct *, struct file *, uint, ulong);
 402 static int mxser_ioctl_special(unsigned int, void __user *);
 403 static void mxser_throttle(struct tty_struct *);
 404 static void mxser_unthrottle(struct tty_struct *);
 405 static void mxser_set_termios(struct tty_struct *, struct ktermios *);
 406 static void mxser_stop(struct tty_struct *);
 407 static void mxser_start(struct tty_struct *);
 408 static void mxser_hangup(struct tty_struct *);
 409 static void mxser_rs_break(struct tty_struct *, int);
 410 static irqreturn_t mxser_interrupt(int, void *);
 411 static void mxser_receive_chars(struct mxser_struct *, int *);
 412 static void mxser_transmit_chars(struct mxser_struct *);
 413 static void mxser_check_modem_status(struct mxser_struct *, int);
 414 static int mxser_block_til_ready(struct tty_struct *, struct file *, struct mxser_struct *);
 415 static int mxser_startup(struct mxser_struct *);
 416 static void mxser_shutdown(struct mxser_struct *);
 417 static int mxser_change_speed(struct mxser_struct *, struct ktermios *old_termios);
 418 static int mxser_get_serial_info(struct mxser_struct *, struct serial_struct __user *);
 419 static int mxser_set_serial_info(struct mxser_struct *, struct serial_struct __user *);
 420 static int mxser_get_lsr_info(struct mxser_struct *, unsigned int __user *);
 421 static void mxser_send_break(struct mxser_struct *, int);
 422 static int mxser_tiocmget(struct tty_struct *, struct file *);
 423 static int mxser_tiocmset(struct tty_struct *, struct file *, unsigned int, unsigned int);
 424 static int mxser_set_baud(struct mxser_struct *info, long newspd);
 425 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout);
 426
 427 static void mxser_startrx(struct tty_struct *tty);
 428 static void mxser_stoprx(struct tty_struct *tty);
 429
 430
 431 static int CheckIsMoxaMust(int io)
 432 {
 433         u8 oldmcr, hwid;
 434         int i;
 435
 436         outb(0, io + UART_LCR);
 437         DISABLE_MOXA_MUST_ENCHANCE_MODE(io);
 438         oldmcr = inb(io + UART_MCR);
 439         outb(0, io + UART_MCR);
 440         SET_MOXA_MUST_XON1_VALUE(io, 0x11);
 441         if ((hwid = inb(io + UART_MCR)) != 0) {
 442                 outb(oldmcr, io + UART_MCR);
 443                 return MOXA_OTHER_UART;
 444         }
 445
 446         GET_MOXA_MUST_HARDWARE_ID(io, &hwid);
 447         for (i = 0; i < UART_TYPE_NUM; i++) {
 448                 if (hwid == Gmoxa_uart_id[i])
 449                         return (int)hwid;
 450         }
 451         return MOXA_OTHER_UART;
 452 }
 453
 454 /* above is modified by Victor Yu. 08-15-2002 */
 455
 456 static const struct tty_operations mxser_ops = {
 457         .open = mxser_open,
 458         .close = mxser_close,
 459         .write = mxser_write,
 460         .put_char = mxser_put_char,
 461         .flush_chars = mxser_flush_chars,
 462         .write_room = mxser_write_room,
 463         .chars_in_buffer = mxser_chars_in_buffer,
 464         .flush_buffer = mxser_flush_buffer,
 465         .ioctl = mxser_ioctl,
 466         .throttle = mxser_throttle,
 467         .unthrottle = mxser_unthrottle,
 468         .set_termios = mxser_set_termios,
 469         .stop = mxser_stop,
 470         .start = mxser_start,
 471         .hangup = mxser_hangup,
 472         .break_ctl = mxser_rs_break,
 473         .wait_until_sent = mxser_wait_until_sent,
 474         .tiocmget = mxser_tiocmget,
 475         .tiocmset = mxser_tiocmset,
 476 };
 477
 478 /*
 479  * The MOXA Smartio/Industio serial driver boot-time initialization code!
 480  */
 481
 482 static int __init mxser_module_init(void)
 483 {
 484         int ret;
 485
 486         if (verbose)
 487                 printk(KERN_DEBUG "Loading module mxser ...\n");
 488         ret = mxser_init();
 489         if (verbose)
 490                 printk(KERN_DEBUG "Done.\n");
 491         return ret;
 492 }
 493
 494 static void __exit mxser_module_exit(void)
 495 {
 496         int i, err;
 497
 498         if (verbose)
 499                 printk(KERN_DEBUG "Unloading module mxser ...\n");
 500
 501         err = tty_unregister_driver(mxvar_sdriver);
 502         if (!err)
 503                 put_tty_driver(mxvar_sdriver);
 504         else
 505                 printk(KERN_ERR "Couldn't unregister MOXA Smartio/Industio family serial driver\n");
 506
 507         for (i = 0; i < MXSER_BOARDS; i++) {
 508                 struct pci_dev *pdev;
 509
 510                 if (mxsercfg[i].board_type == -1)
 511                         continue;
 512                 else {
 513                         pdev = mxsercfg[i].pciInfo.pdev;
 514                         free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]);
 515                         if (pdev != NULL) {     /* PCI */
 516                                 release_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2));
 517                                 release_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3));
 518                                 pci_dev_put(pdev);
 519                         } else {
 520                                 release_region(mxsercfg[i].ioaddr[0], 8 * mxsercfg[i].ports);
 521                                 release_region(mxsercfg[i].vector, 1);
 522                         }
 523                 }
 524         }
 525         if (verbose)
 526                 printk(KERN_DEBUG "Done.\n");
 527 }
 528
 529 static void process_txrx_fifo(struct mxser_struct *info)
 530 {
 531         int i;
 532
 533         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 534                 info->rx_trigger = 1;
 535                 info->rx_high_water = 1;
 536                 info->rx_low_water = 1;
 537                 info->xmit_fifo_size = 1;
 538         } else {
 539                 for (i = 0; i < UART_INFO_NUM; i++) {
 540                         if (info->IsMoxaMustChipFlag == Gpci_uart_info[i].type) {
 541                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 542                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 543                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 544                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 545                                 break;
 546                         }
 547                 }
 548         }
 549 }
 550
 551 static int mxser_initbrd(int board, struct mxser_hwconf *hwconf)
 552 {
 553         struct mxser_struct *info;
 554         int retval;
 555         int i, n;
 556
 557         n = board * MXSER_PORTS_PER_BOARD;
 558         info = &mxvar_table[n];
 559         /*if (verbose) */  {
 560                 printk(KERN_DEBUG "        ttyMI%d - ttyMI%d ",
 561                         n, n + hwconf->ports - 1);
 562                 printk(" max. baud rate = %d bps.\n",
 563                         hwconf->MaxCanSetBaudRate[0]);
 564         }
 565
 566         for (i = 0; i < hwconf->ports; i++, n++, info++) {
 567                 info->port = n;
 568                 info->base = hwconf->ioaddr[i];
 569                 info->irq = hwconf->irq;
 570                 info->vector = hwconf->vector;
 571                 info->vectormask = hwconf->vector_mask;
 572                 info->opmode_ioaddr = hwconf->opmode_ioaddr[i]; /* add by Victor Yu. 01-05-2004 */
 573                 info->stop_rx = 0;
 574                 info->ldisc_stop_rx = 0;
 575
 576                 info->IsMoxaMustChipFlag = hwconf->IsMoxaMustChipFlag;
 577                 /* Enhance mode enabled here */
 578                 if (info->IsMoxaMustChipFlag != MOXA_OTHER_UART) {
 579                         ENABLE_MOXA_MUST_ENCHANCE_MODE(info->base);
 580                 }
 581
 582                 info->flags = ASYNC_SHARE_IRQ;
 583                 info->type = hwconf->uart_type;
 584                 info->baud_base = hwconf->baud_base[i];
 585
 586                 info->MaxCanSetBaudRate = hwconf->MaxCanSetBaudRate[i];
 587
 588                 process_txrx_fifo(info);
 589
 590
 591                 info->custom_divisor = hwconf->baud_base[i] * 16;
 592                 info->close_delay = 5 * HZ / 10;
 593                 info->closing_wait = 30 * HZ;
 594                 INIT_WORK(&info->tqueue, mxser_do_softint);
 595                 info->normal_termios = mxvar_sdriver->init_termios;
 596                 init_waitqueue_head(&info->open_wait);
 597                 init_waitqueue_head(&info->close_wait);
 598                 init_waitqueue_head(&info->delta_msr_wait);
 599                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
 600                 info->err_shadow = 0;
 601                 spin_lock_init(&info->slock);
 602         }
 603         /*
 604          * Allocate the IRQ if necessary
 605          */
 606
 607
 608         /* before set INT ISR, disable all int */
 609         for (i = 0; i < hwconf->ports; i++) {
 610                 outb(inb(hwconf->ioaddr[i] + UART_IER) & 0xf0,
 611                         hwconf->ioaddr[i] + UART_IER);
 612         }
 613
 614         n = board * MXSER_PORTS_PER_BOARD;
 615         info = &mxvar_table[n];
 616
 617         retval = request_irq(hwconf->irq, mxser_interrupt, IRQ_T(info),
 618                                 "mxser", info);
 619         if (retval) {
 620                 printk(KERN_ERR "Board %d: %s",
 621                         board, mxser_brdname[hwconf->board_type - 1]);
 622                 printk("  Request irq failed, IRQ (%d) may conflict with"
 623                         " another device.\n", info->irq);
 624                 return retval;
 625         }
 626         return 0;
 627 }
 628
 629 static void mxser_getcfg(int board, struct mxser_hwconf *hwconf)
 630 {
 631         mxsercfg[board] = *hwconf;
 632 }
 633
 634 #ifdef CONFIG_PCI
 635 static int mxser_get_PCI_conf(int busnum, int devnum, int board_type, struct mxser_hwconf *hwconf)
 636 {
 637         int i, j;
 638         /* unsigned int val; */
 639         unsigned int ioaddress;
 640         struct pci_dev *pdev = hwconf->pciInfo.pdev;
 641
 642         /* io address */
 643         hwconf->board_type = board_type;
 644         hwconf->ports = mxser_numports[board_type - 1];
 645         ioaddress = pci_resource_start(pdev, 2);
 646         request_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2),
 647                         "mxser(IO)");
 648
 649         for (i = 0; i < hwconf->ports; i++)
 650                 hwconf->ioaddr[i] = ioaddress + 8 * i;
 651
 652         /* vector */
 653         ioaddress = pci_resource_start(pdev, 3);
 654         request_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3),
 655                         "mxser(vector)");
 656         hwconf->vector = ioaddress;
 657
 658         /* irq */
 659         hwconf->irq = hwconf->pciInfo.pdev->irq;
 660
 661         hwconf->IsMoxaMustChipFlag = CheckIsMoxaMust(hwconf->ioaddr[0]);
 662         hwconf->uart_type = PORT_16550A;
 663         hwconf->vector_mask = 0;
 664
 665
 666         for (i = 0; i < hwconf->ports; i++) {
 667                 for (j = 0; j < UART_INFO_NUM; j++) {
 668                         if (Gpci_uart_info[j].type == hwconf->IsMoxaMustChipFlag) {
 669                                 hwconf->MaxCanSetBaudRate[i] = Gpci_uart_info[j].max_baud;
 670
 671                                 /* exception....CP-102 */
 672                                 if (board_type == MXSER_BOARD_CP102)
 673                                         hwconf->MaxCanSetBaudRate[i] = 921600;
 674                                 break;
 675                         }
 676                 }
 677         }
 678
 679         if (hwconf->IsMoxaMustChipFlag == MOXA_MUST_MU860_HWID) {
 680                 for (i = 0; i < hwconf->ports; i++) {
 681                         if (i < 4)
 682                                 hwconf->opmode_ioaddr[i] = ioaddress + 4;
 683                         else
 684                                 hwconf->opmode_ioaddr[i] = ioaddress + 0x0c;
 685                 }
 686                 outb(0, ioaddress + 4); /* default set to RS232 mode */
 687                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
 688         }
 689
 690         for (i = 0; i < hwconf->ports; i++) {
 691                 hwconf->vector_mask |= (1 << i);
 692                 hwconf->baud_base[i] = 921600;
 693         }
 694         return 0;
 695 }
 696 #endif
 697
 698 static int mxser_init(void)
 699 {
 700         int i, m, retval, b, n;
 701         struct pci_dev *pdev = NULL;
 702         int index;
 703         unsigned char busnum, devnum;
 704         struct mxser_hwconf hwconf;
 705
 706         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
 707         if (!mxvar_sdriver)
 708                 return -ENOMEM;
 709         spin_lock_init(&gm_lock);
 710
 711         for (i = 0; i < MXSER_BOARDS; i++) {
 712                 mxsercfg[i].board_type = -1;
 713         }
 714
 715         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
 716                 MXSER_VERSION);
 717
 718         /* Initialize the tty_driver structure */
 719         memset(mxvar_sdriver, 0, sizeof(struct tty_driver));
 720         mxvar_sdriver->owner = THIS_MODULE;
 721         mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
 722         mxvar_sdriver->name = "ttyMI";
 723         mxvar_sdriver->major = ttymajor;
 724         mxvar_sdriver->minor_start = 0;
 725         mxvar_sdriver->num = MXSER_PORTS + 1;
 726         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
 727         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
 728         mxvar_sdriver->init_termios = tty_std_termios;
 729         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
 730         mxvar_sdriver->init_termios.c_ispeed = 9600;
 731         mxvar_sdriver->init_termios.c_ospeed = 9600;
 732         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW;
 733         tty_set_operations(mxvar_sdriver, &mxser_ops);
 734         mxvar_sdriver->ttys = mxvar_tty;
 735         mxvar_sdriver->termios = mxvar_termios;
 736         mxvar_sdriver->termios_locked = mxvar_termios_locked;
 737
 738         mxvar_diagflag = 0;
 739         memset(mxvar_table, 0, MXSER_PORTS * sizeof(struct mxser_struct));
 740         memset(&mxvar_log, 0, sizeof(struct mxser_log));
 741
 742         memset(&mxser_msr, 0, sizeof(unsigned char) * (MXSER_PORTS + 1));
 743         memset(&mon_data_ext, 0, sizeof(struct mxser_mon_ext));
 744         memset(&mxser_set_baud_method, 0, sizeof(int) * (MXSER_PORTS + 1));
 745         memset(&hwconf, 0, sizeof(struct mxser_hwconf));
 746
 747         m = 0;
 748         /* Start finding ISA boards here */
 749         for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
 750                 int cap;
 751
 752                 if (!(cap = mxserBoardCAP[b]))
 753                         continue;
 754
 755                 retval = mxser_get_ISA_conf(cap, &hwconf);
 756
 757                 if (retval != 0)
 758                         printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n",
 759                                 mxser_brdname[hwconf.board_type - 1], ioaddr[b]);
 760
 761                 if (retval <= 0) {
 762                         if (retval == MXSER_ERR_IRQ)
 763                                 printk(KERN_ERR "Invalid interrupt number, "
 764                                         "board not configured\n");
 765                         else if (retval == MXSER_ERR_IRQ_CONFLIT)
 766                                 printk(KERN_ERR "Invalid interrupt number, "
 767                                         "board not configured\n");
 768                         else if (retval == MXSER_ERR_VECTOR)
 769                                 printk(KERN_ERR "Invalid interrupt vector, "
 770                                         "board not configured\n");
 771                         else if (retval == MXSER_ERR_IOADDR)
 772                                 printk(KERN_ERR "Invalid I/O address, "
 773                                         "board not configured\n");
 774
 775                         continue;
 776                 }
 777
 778                 hwconf.pciInfo.busNum = 0;
 779                 hwconf.pciInfo.devNum = 0;
 780                 hwconf.pciInfo.pdev = NULL;
 781
 782                 mxser_getcfg(m, &hwconf);
 783                 /*
 784                  * init mxsercfg first,
 785                  * or mxsercfg data is not correct on ISR.
 786                  */
 787                 /* mxser_initbrd will hook ISR. */
 788                 if (mxser_initbrd(m, &hwconf) < 0)
 789                         continue;
 790
 791                 m++;
 792         }
 793
 794         /* Start finding ISA boards from module arg */
 795         for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
 796                 int cap;
 797
 798                 if (!(cap = ioaddr[b]))
 799                         continue;
 800
 801                 retval = mxser_get_ISA_conf(cap, &hwconf);
 802
 803                 if (retval != 0)
 804                         printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n",
 805                                 mxser_brdname[hwconf.board_type - 1], ioaddr[b]);
 806
 807                 if (retval <= 0) {
 808                         if (retval == MXSER_ERR_IRQ)
 809                                 printk(KERN_ERR "Invalid interrupt number, "
 810                                         "board not configured\n");
 811                         else if (retval == MXSER_ERR_IRQ_CONFLIT)
 812                                 printk(KERN_ERR "Invalid interrupt number, "
 813                                         "board not configured\n");
 814                         else if (retval == MXSER_ERR_VECTOR)
 815                                 printk(KERN_ERR "Invalid interrupt vector, "
 816                                         "board not configured\n");
 817                         else if (retval == MXSER_ERR_IOADDR)
 818                                 printk(KERN_ERR "Invalid I/O address, "
 819                                         "board not configured\n");
 820
 821                         continue;
 822                 }
 823
 824                 hwconf.pciInfo.busNum = 0;
 825                 hwconf.pciInfo.devNum = 0;
 826                 hwconf.pciInfo.pdev = NULL;
 827
 828                 mxser_getcfg(m, &hwconf);
 829                 /*
 830                  * init mxsercfg first,
 831                  * or mxsercfg data is not correct on ISR.
 832                  */
 833                 /* mxser_initbrd will hook ISR. */
 834                 if (mxser_initbrd(m, &hwconf) < 0)
 835                         continue;
 836
 837                 m++;
 838         }
 839
 840         /* start finding PCI board here */
 841 #ifdef CONFIG_PCI
 842         n = ARRAY_SIZE(mxser_pcibrds) - 1;
 843         index = 0;
 844         b = 0;
 845         while (b < n) {
 846                 pdev = pci_get_device(mxser_pcibrds[b].vendor,
 847                                 mxser_pcibrds[b].device, pdev);
 848                 if (pdev == NULL) {
 849                         b++;
 850                         continue;
 851                 }
 852                 hwconf.pciInfo.busNum = busnum = pdev->bus->number;
 853                 hwconf.pciInfo.devNum = devnum = PCI_SLOT(pdev->devfn) << 3;
 854                 hwconf.pciInfo.pdev = pdev;
 855                 printk(KERN_INFO "Found MOXA %s board(BusNo=%d,DevNo=%d)\n",
 856                         mxser_brdname[(int) (mxser_pcibrds[b].driver_data) - 1],
 857                         busnum, devnum >> 3);
 858                 index++;
 859                 if (m >= MXSER_BOARDS)
 860                         printk(KERN_ERR
 861                                 "Too many Smartio/Industio family boards find "
 862                                 "(maximum %d), board not configured\n",
 863                                 MXSER_BOARDS);
 864                 else {
 865                         if (pci_enable_device(pdev)) {
 866                                 printk(KERN_ERR "Moxa SmartI/O PCI enable "
 867                                         "fail !\n");
 868                                 continue;
 869                         }
 870                         retval = mxser_get_PCI_conf(busnum, devnum,
 871                                         (int)mxser_pcibrds[b].driver_data,
 872                                         &hwconf);
 873                         if (retval < 0) {
 874                                 if (retval == MXSER_ERR_IRQ)
 875                                         printk(KERN_ERR
 876                                                 "Invalid interrupt number, "
 877                                                 "board not configured\n");
 878                                 else if (retval == MXSER_ERR_IRQ_CONFLIT)
 879                                         printk(KERN_ERR
 880                                                 "Invalid interrupt number, "
 881                                                 "board not configured\n");
 882                                 else if (retval == MXSER_ERR_VECTOR)
 883                                         printk(KERN_ERR
 884                                                 "Invalid interrupt vector, "
 885                                                 "board not configured\n");
 886                                 else if (retval == MXSER_ERR_IOADDR)
 887                                         printk(KERN_ERR
 888                                                 "Invalid I/O address, "
 889                                                 "board not configured\n");
 890                                 continue;
 891                         }
 892                         mxser_getcfg(m, &hwconf);
 893                         /* init mxsercfg first,
 894                          * or mxsercfg data is not correct on ISR.
 895                          */
 896                         /* mxser_initbrd will hook ISR. */
 897                         if (mxser_initbrd(m, &hwconf) < 0)
 898                                 continue;
 899                         m++;
 900                         /* Keep an extra reference if we succeeded. It will
 901                            be returned at unload time */
 902                         pci_dev_get(pdev);
 903                 }
 904         }
 905 #endif
 906
 907         retval = tty_register_driver(mxvar_sdriver);
 908         if (retval) {
 909                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family"
 910                                 " driver !\n");
 911                 put_tty_driver(mxvar_sdriver);
 912
 913                 for (i = 0; i < MXSER_BOARDS; i++) {
 914                         if (mxsercfg[i].board_type == -1)
 915                                 continue;
 916                         else {
 917                                 free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]);
 918                                 /* todo: release io, vector */
 919                         }
 920                 }
 921                 return retval;
 922         }
 923
 924         return 0;
 925 }
 926
 927 static void mxser_do_softint(struct work_struct *work)
 928 {
 929         struct mxser_struct *info =
 930                 container_of(work, struct mxser_struct, tqueue);
 931         struct tty_struct *tty;
 932
 933         tty = info->tty;
 934
 935         if (tty) {
 936                 if (test_and_clear_bit(MXSER_EVENT_TXLOW, &info->event))
 937                         tty_wakeup(tty);
 938                 if (test_and_clear_bit(MXSER_EVENT_HANGUP, &info->event))
 939                         tty_hangup(tty);
 940         }
 941 }
 942
 943 static unsigned char mxser_get_msr(int baseaddr, int mode, int port, struct mxser_struct *info)
 944 {
 945         unsigned char status = 0;
 946
 947         status = inb(baseaddr + UART_MSR);
 948
 949         mxser_msr[port] &= 0x0F;
 950         mxser_msr[port] |= status;
 951         status = mxser_msr[port];
 952         if (mode)
 953                 mxser_msr[port] = 0;
 954
 955         return status;
 956 }
 957
 958 /*
 959  * This routine is called whenever a serial port is opened.  It
 960  * enables interrupts for a serial port, linking in its async structure into
 961  * the IRQ chain.   It also performs the serial-specific
 962  * initialization for the tty structure.
 963  */
 964 static int mxser_open(struct tty_struct *tty, struct file *filp)
 965 {
 966         struct mxser_struct *info;
 967         int retval, line;
 968
 969         /* initialize driver_data in case something fails */
 970         tty->driver_data = NULL;
 971
 972         line = tty->index;
 973         if (line == MXSER_PORTS)
 974                 return 0;
 975         if (line < 0 || line > MXSER_PORTS)
 976                 return -ENODEV;
 977         info = mxvar_table + line;
 978         if (!info->base)
 979                 return -ENODEV;
 980
 981         tty->driver_data = info;
 982         info->tty = tty;
 983         /*
 984          * Start up serial port
 985          */
 986         retval = mxser_startup(info);
 987         if (retval)
 988                 return retval;
 989
 990         retval = mxser_block_til_ready(tty, filp, info);
 991         if (retval)
 992                 return retval;
 993
 994         info->count++;
 995
 996         if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
 997                 if (tty->driver->subtype == SERIAL_TYPE_NORMAL)
 998                         *tty->termios = info->normal_termios;
 999                 else
1000                         *tty->termios = info->callout_termios;
1001                 mxser_change_speed(info, NULL);
1002         }
1003
1004         info->session = process_session(current);
1005         info->pgrp = process_group(current);
1006
1007         /*
1008         status = mxser_get_msr(info->base, 0, info->port);
1009         mxser_check_modem_status(info, status);
1010         */
1011
1012 /* unmark here for very high baud rate (ex. 921600 bps) used */
1013         tty->low_latency = 1;
1014         return 0;
1015 }
1016
1017 /*
1018  * This routine is called when the serial port gets closed.  First, we
1019  * wait for the last remaining data to be sent.  Then, we unlink its
1020  * async structure from the interrupt chain if necessary, and we free
1021  * that IRQ if nothing is left in the chain.
1022  */
1023 static void mxser_close(struct tty_struct *tty, struct file *filp)
1024 {
1025         struct mxser_struct *info = tty->driver_data;
1026
1027         unsigned long timeout;
1028         unsigned long flags;
1029         struct tty_ldisc *ld;
1030
1031         if (tty->index == MXSER_PORTS)
1032                 return;
1033         if (!info)
1034                 return;
1035
1036         spin_lock_irqsave(&info->slock, flags);
1037
1038         if (tty_hung_up_p(filp)) {
1039                 spin_unlock_irqrestore(&info->slock, flags);
1040                 return;
1041         }
1042         if ((tty->count == 1) && (info->count != 1)) {
1043                 /*
1044                  * Uh, oh.  tty->count is 1, which means that the tty
1045                  * structure will be freed.  Info->count should always
1046                  * be one in these conditions.  If it's greater than
1047                  * one, we've got real problems, since it means the
1048                  * serial port won't be shutdown.
1049                  */
1050                 printk(KERN_ERR "mxser_close: bad serial port count; "
1051                         "tty->count is 1, info->count is %d\n", info->count);
1052                 info->count = 1;
1053         }
1054         if (--info->count < 0) {
1055                 printk(KERN_ERR "mxser_close: bad serial port count for "
1056                         "ttys%d: %d\n", info->port, info->count);
1057                 info->count = 0;
1058         }
1059         if (info->count) {
1060                 spin_unlock_irqrestore(&info->slock, flags);
1061                 return;
1062         }
1063         info->flags |= ASYNC_CLOSING;
1064         spin_unlock_irqrestore(&info->slock, flags);
1065         /*
1066          * Save the termios structure, since this port may have
1067          * separate termios for callout and dialin.
1068          */
1069         if (info->flags & ASYNC_NORMAL_ACTIVE)
1070                 info->normal_termios = *tty->termios;
1071         /*
1072          * Now we wait for the transmit buffer to clear; and we notify
1073          * the line discipline to only process XON/XOFF characters.
1074          */
1075         tty->closing = 1;
1076         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1077                 tty_wait_until_sent(tty, info->closing_wait);
1078         /*
1079          * At this point we stop accepting input.  To do this, we
1080          * disable the receive line status interrupts, and tell the
1081          * interrupt driver to stop checking the data ready bit in the
1082          * line status register.
1083          */
1084         info->IER &= ~UART_IER_RLSI;
1085         if (info->IsMoxaMustChipFlag)
1086                 info->IER &= ~MOXA_MUST_RECV_ISR;
1087 /* by William
1088         info->read_status_mask &= ~UART_LSR_DR;
1089 */
1090         if (info->flags & ASYNC_INITIALIZED) {
1091                 outb(info->IER, info->base + UART_IER);
1092                 /*
1093                  * Before we drop DTR, make sure the UART transmitter
1094                  * has completely drained; this is especially
1095                  * important if there is a transmit FIFO!
1096                  */
1097                 timeout = jiffies + HZ;
1098                 while (!(inb(info->base + UART_LSR) & UART_LSR_TEMT)) {
1099                         schedule_timeout_interruptible(5);
1100                         if (time_after(jiffies, timeout))
1101                                 break;
1102                 }
1103         }
1104         mxser_shutdown(info);
1105
1106         if (tty->driver->flush_buffer)
1107                 tty->driver->flush_buffer(tty);
1108
1109         ld = tty_ldisc_ref(tty);
1110         if (ld) {
1111                 if (ld->flush_buffer)
1112                         ld->flush_buffer(tty);
1113                 tty_ldisc_deref(ld);
1114         }
1115
1116         tty->closing = 0;
1117         info->event = 0;
1118         info->tty = NULL;
1119         if (info->blocked_open) {
1120                 if (info->close_delay)
1121                         schedule_timeout_interruptible(info->close_delay);
1122                 wake_up_interruptible(&info->open_wait);
1123         }
1124
1125         info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1126         wake_up_interruptible(&info->close_wait);
1127
1128 }
1129
1130 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1131 {
1132         int c, total = 0;
1133         struct mxser_struct *info = tty->driver_data;
1134         unsigned long flags;
1135
1136         if (!info->xmit_buf)
1137                 return 0;
1138
1139         while (1) {
1140                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1141                                           SERIAL_XMIT_SIZE - info->xmit_head));
1142                 if (c <= 0)
1143                         break;
1144
1145                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1146                 spin_lock_irqsave(&info->slock, flags);
1147                 info->xmit_head = (info->xmit_head + c) &
1148                                   (SERIAL_XMIT_SIZE - 1);
1149                 info->xmit_cnt += c;
1150                 spin_unlock_irqrestore(&info->slock, flags);
1151
1152                 buf += c;
1153                 count -= c;
1154                 total += c;
1155         }
1156
1157         if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1158                 if (!tty->hw_stopped ||
1159                                 (info->type == PORT_16550A) ||
1160                                 (info->IsMoxaMustChipFlag)) {
1161                         spin_lock_irqsave(&info->slock, flags);
1162                         info->IER |= UART_IER_THRI;
1163                         outb(info->IER, info->base + UART_IER);
1164                         spin_unlock_irqrestore(&info->slock, flags);
1165                 }
1166         }
1167         return total;
1168 }
1169
1170 static void mxser_put_char(struct tty_struct *tty, unsigned char ch)
1171 {
1172         struct mxser_struct *info = tty->driver_data;
1173         unsigned long flags;
1174
1175         if (!info->xmit_buf)
1176                 return;
1177
1178         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1179                 return;
1180
1181         spin_lock_irqsave(&info->slock, flags);
1182         info->xmit_buf[info->xmit_head++] = ch;
1183         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1184         info->xmit_cnt++;
1185         spin_unlock_irqrestore(&info->slock, flags);
1186         if (!tty->stopped && !(info->IER & UART_IER_THRI)) {
1187                 if (!tty->hw_stopped ||
1188                                 (info->type == PORT_16550A) ||
1189                                 info->IsMoxaMustChipFlag) {
1190                         spin_lock_irqsave(&info->slock, flags);
1191                         info->IER |= UART_IER_THRI;
1192                         outb(info->IER, info->base + UART_IER);
1193                         spin_unlock_irqrestore(&info->slock, flags);
1194                 }
1195         }
1196 }
1197
1198
1199 static void mxser_flush_chars(struct tty_struct *tty)
1200 {
1201         struct mxser_struct *info = tty->driver_data;
1202         unsigned long flags;
1203
1204         if (info->xmit_cnt <= 0 ||
1205                         tty->stopped ||
1206                         !info->xmit_buf ||
1207                         (tty->hw_stopped &&
1208                          (info->type != PORT_16550A) &&
1209                          (!info->IsMoxaMustChipFlag)
1210                         ))
1211                 return;
1212
1213         spin_lock_irqsave(&info->slock, flags);
1214
1215         info->IER |= UART_IER_THRI;
1216         outb(info->IER, info->base + UART_IER);
1217
1218         spin_unlock_irqrestore(&info->slock, flags);
1219 }
1220
1221 static int mxser_write_room(struct tty_struct *tty)
1222 {
1223         struct mxser_struct *info = tty->driver_data;
1224         int ret;
1225
1226         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1227         if (ret < 0)
1228                 ret = 0;
1229         return ret;
1230 }
1231
1232 static int mxser_chars_in_buffer(struct tty_struct *tty)
1233 {
1234         struct mxser_struct *info = tty->driver_data;
1235         return info->xmit_cnt;
1236 }
1237
1238 static void mxser_flush_buffer(struct tty_struct *tty)
1239 {
1240         struct mxser_struct *info = tty->driver_data;
1241         char fcr;
1242         unsigned long flags;
1243
1244
1245         spin_lock_irqsave(&info->slock, flags);
1246         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1247
1248         /* below added by shinhay */
1249         fcr = inb(info->base + UART_FCR);
1250         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1251                 info->base + UART_FCR);
1252         outb(fcr, info->base + UART_FCR);
1253
1254         spin_unlock_irqrestore(&info->slock, flags);
1255         /* above added by shinhay */
1256
1257         wake_up_interruptible(&tty->write_wait);
1258         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
1259                 (tty->ldisc.write_wakeup) (tty);
1260 }
1261
1262 static int mxser_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1263 {
1264         struct mxser_struct *info = tty->driver_data;
1265         int retval;
1266         struct async_icount cprev, cnow;        /* kernel counter temps */
1267         struct serial_icounter_struct __user *p_cuser;
1268         unsigned long templ;
1269         unsigned long flags;
1270         void __user *argp = (void __user *)arg;
1271
1272         if (tty->index == MXSER_PORTS)
1273                 return mxser_ioctl_special(cmd, argp);
1274
1275         /* following add by Victor Yu. 01-05-2004 */
1276         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1277                 int opmode, p;
1278                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1279                 int shiftbit;
1280                 unsigned char val, mask;
1281
1282                 p = info->port % 4;
1283                 if (cmd == MOXA_SET_OP_MODE) {
1284                         if (get_user(opmode, (int __user *) argp))
1285                                 return -EFAULT;
1286                         if (opmode != RS232_MODE &&
1287                                         opmode != RS485_2WIRE_MODE &&
1288                                         opmode != RS422_MODE &&
1289                                         opmode != RS485_4WIRE_MODE)
1290                                 return -EFAULT;
1291                         mask = ModeMask[p];
1292                         shiftbit = p * 2;
1293                         val = inb(info->opmode_ioaddr);
1294                         val &= mask;
1295                         val |= (opmode << shiftbit);
1296                         outb(val, info->opmode_ioaddr);
1297                 } else {
1298                         shiftbit = p * 2;
1299                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1300                         opmode &= OP_MODE_MASK;
1301                         if (copy_to_user(argp, &opmode, sizeof(int)))
1302                                 return -EFAULT;
1303                 }
1304                 return 0;
1305         }
1306         /* above add by Victor Yu. 01-05-2004 */
1307
1308         if ((cmd != TIOCGSERIAL) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1309                 if (tty->flags & (1 << TTY_IO_ERROR))
1310                         return -EIO;
1311         }
1312         switch (cmd) {
1313         case TCSBRK:            /* SVID version: non-zero arg --> no break */
1314                 retval = tty_check_change(tty);
1315                 if (retval)
1316                         return retval;
1317                 tty_wait_until_sent(tty, 0);
1318                 if (!arg)
1319                         mxser_send_break(info, HZ / 4); /* 1/4 second */
1320                 return 0;
1321         case TCSBRKP:           /* support for POSIX tcsendbreak() */
1322                 retval = tty_check_change(tty);
1323                 if (retval)
1324                         return retval;
1325                 tty_wait_until_sent(tty, 0);
1326                 mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1327                 return 0;
1328         case TIOCGSOFTCAR:
1329                 return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *)argp);
1330         case TIOCSSOFTCAR:
1331                 if (get_user(templ, (unsigned long __user *) argp))
1332                         return -EFAULT;
1333                 arg = templ;
1334                 tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
1335                 return 0;
1336         case TIOCGSERIAL:
1337                 return mxser_get_serial_info(info, argp);
1338         case TIOCSSERIAL:
1339                 return mxser_set_serial_info(info, argp);
1340         case TIOCSERGETLSR:     /* Get line status register */
1341                 return mxser_get_lsr_info(info, argp);
1342                 /*
1343                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1344                  * - mask passed in arg for lines of interest
1345                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1346                  * Caller should use TIOCGICOUNT to see which one it was
1347                  */
1348         case TIOCMIWAIT: {
1349                         DECLARE_WAITQUEUE(wait, current);
1350                         int ret;
1351                         spin_lock_irqsave(&info->slock, flags);
1352                         cprev = info->icount;   /* note the counters on entry */
1353                         spin_unlock_irqrestore(&info->slock, flags);
1354
1355                         add_wait_queue(&info->delta_msr_wait, &wait);
1356                         while (1) {
1357                                 spin_lock_irqsave(&info->slock, flags);
1358                                 cnow = info->icount;    /* atomic copy */
1359                                 spin_unlock_irqrestore(&info->slock, flags);
1360
1361                                 set_current_state(TASK_INTERRUPTIBLE);
1362                                 if (((arg & TIOCM_RNG) &&
1363                                                 (cnow.rng != cprev.rng)) ||
1364                                                 ((arg & TIOCM_DSR) &&
1365                                                 (cnow.dsr != cprev.dsr)) ||
1366                                                 ((arg & TIOCM_CD) &&
1367                                                 (cnow.dcd != cprev.dcd)) ||
1368                                                 ((arg & TIOCM_CTS) &&
1369                                                 (cnow.cts != cprev.cts))) {
1370                                         ret = 0;
1371                                         break;
1372                                 }
1373                                 /* see if a signal did it */
1374                                 if (signal_pending(current)) {
1375                                         ret = -ERESTARTSYS;
1376                                         break;
1377                                 }
1378                                 cprev = cnow;
1379                         }
1380                         current->state = TASK_RUNNING;
1381                         remove_wait_queue(&info->delta_msr_wait, &wait);
1382                         break;
1383                 }
1384                 /* NOTREACHED */
1385                 /*
1386                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1387                  * Return: write counters to the user passed counter struct
1388                  * NB: both 1->0 and 0->1 transitions are counted except for
1389                  *     RI where only 0->1 is counted.
1390                  */
1391         case TIOCGICOUNT:
1392                 spin_lock_irqsave(&info->slock, flags);
1393                 cnow = info->icount;
1394                 spin_unlock_irqrestore(&info->slock, flags);
1395                 p_cuser = argp;
1396                 /* modified by casper 1/11/2000 */
1397                 if (put_user(cnow.frame, &p_cuser->frame))
1398                         return -EFAULT;
1399                 if (put_user(cnow.brk, &p_cuser->brk))
1400                         return -EFAULT;
1401                 if (put_user(cnow.overrun, &p_cuser->overrun))
1402                         return -EFAULT;
1403                 if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1404                         return -EFAULT;
1405                 if (put_user(cnow.parity, &p_cuser->parity))
1406                         return -EFAULT;
1407                 if (put_user(cnow.rx, &p_cuser->rx))
1408                         return -EFAULT;
1409                 if (put_user(cnow.tx, &p_cuser->tx))
1410                         return -EFAULT;
1411                 put_user(cnow.cts, &p_cuser->cts);
1412                 put_user(cnow.dsr, &p_cuser->dsr);
1413                 put_user(cnow.rng, &p_cuser->rng);
1414                 put_user(cnow.dcd, &p_cuser->dcd);
1415                 return 0;
1416         case MOXA_HighSpeedOn:
1417                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1418         case MOXA_SDS_RSTICOUNTER: {
1419                         info->mon_data.rxcnt = 0;
1420                         info->mon_data.txcnt = 0;
1421                         return 0;
1422                 }
1423 /* (above) added by James. */
1424         case MOXA_ASPP_SETBAUD:{
1425                         long baud;
1426                         if (get_user(baud, (long __user *)argp))
1427                                 return -EFAULT;
1428                         mxser_set_baud(info, baud);
1429                         return 0;
1430                 }
1431         case MOXA_ASPP_GETBAUD:
1432                 if (copy_to_user(argp, &info->realbaud, sizeof(long)))
1433                         return -EFAULT;
1434
1435                 return 0;
1436
1437         case MOXA_ASPP_OQUEUE:{
1438                         int len, lsr;
1439
1440                         len = mxser_chars_in_buffer(tty);
1441
1442                         lsr = inb(info->base + UART_LSR) & UART_LSR_TEMT;
1443
1444                         len += (lsr ? 0 : 1);
1445
1446                         if (copy_to_user(argp, &len, sizeof(int)))
1447                                 return -EFAULT;
1448
1449                         return 0;
1450                 }
1451         case MOXA_ASPP_MON: {
1452                         int mcr, status;
1453
1454                         /* info->mon_data.ser_param = tty->termios->c_cflag; */
1455
1456                         status = mxser_get_msr(info->base, 1, info->port, info);
1457                         mxser_check_modem_status(info, status);
1458
1459                         mcr = inb(info->base + UART_MCR);
1460                         if (mcr & MOXA_MUST_MCR_XON_FLAG)
1461                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1462                         else
1463                                 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1464
1465                         if (mcr & MOXA_MUST_MCR_TX_XON)
1466                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1467                         else
1468                                 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1469
1470                         if (info->tty->hw_stopped)
1471                                 info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1472                         else
1473                                 info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1474
1475                         if (copy_to_user(argp, &info->mon_data,
1476                                         sizeof(struct mxser_mon)))
1477                                 return -EFAULT;
1478
1479                         return 0;
1480                 }
1481
1482         case MOXA_ASPP_LSTATUS: {
1483                         if (copy_to_user(argp, &info->err_shadow,
1484                                         sizeof(unsigned char)))
1485                                 return -EFAULT;
1486
1487                         info->err_shadow = 0;
1488                         return 0;
1489                 }
1490         case MOXA_SET_BAUD_METHOD: {
1491                         int method;
1492
1493                         if (get_user(method, (int __user *)argp))
1494                                 return -EFAULT;
1495                         mxser_set_baud_method[info->port] = method;
1496                         if (copy_to_user(argp, &method, sizeof(int)))
1497                                 return -EFAULT;
1498
1499                         return 0;
1500                 }
1501         default:
1502                 return -ENOIOCTLCMD;
1503         }
1504         return 0;
1505 }
1506
1507 #ifndef CMSPAR
1508 #define CMSPAR 010000000000
1509 #endif
1510
1511 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1512 {
1513         int i, result, status;
1514
1515         switch (cmd) {
1516         case MOXA_GET_CONF:
1517                 if (copy_to_user(argp, mxsercfg,
1518                                 sizeof(struct mxser_hwconf) * 4))
1519                         return -EFAULT;
1520                 return 0;
1521         case MOXA_GET_MAJOR:
1522                 if (copy_to_user(argp, &ttymajor, sizeof(int)))
1523                         return -EFAULT;
1524                 return 0;
1525
1526         case MOXA_GET_CUMAJOR:
1527                 if (copy_to_user(argp, &calloutmajor, sizeof(int)))
1528                         return -EFAULT;
1529                 return 0;
1530
1531         case MOXA_CHKPORTENABLE:
1532                 result = 0;
1533                 for (i = 0; i < MXSER_PORTS; i++) {
1534                         if (mxvar_table[i].base)
1535                                 result |= (1 << i);
1536                 }
1537                 return put_user(result, (unsigned long __user *)argp);
1538         case MOXA_GETDATACOUNT:
1539                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1540                         return -EFAULT;
1541                 return 0;
1542         case MOXA_GETMSTATUS:
1543                 for (i = 0; i < MXSER_PORTS; i++) {
1544                         GMStatus[i].ri = 0;
1545                         if (!mxvar_table[i].base) {
1546                                 GMStatus[i].dcd = 0;
1547                                 GMStatus[i].dsr = 0;
1548                                 GMStatus[i].cts = 0;
1549                                 continue;
1550                         }
1551
1552                         if (!mxvar_table[i].tty || !mxvar_table[i].tty->termios)
1553                                 GMStatus[i].cflag = mxvar_table[i].normal_termios.c_cflag;
1554                         else
1555                                 GMStatus[i].cflag = mxvar_table[i].tty->termios->c_cflag;
1556
1557                         status = inb(mxvar_table[i].base + UART_MSR);
1558                         if (status & 0x80 /*UART_MSR_DCD */ )
1559                                 GMStatus[i].dcd = 1;
1560                         else
1561                                 GMStatus[i].dcd = 0;
1562
1563                         if (status & 0x20 /*UART_MSR_DSR */ )
1564                                 GMStatus[i].dsr = 1;
1565                         else
1566                                 GMStatus[i].dsr = 0;
1567
1568
1569                         if (status & 0x10 /*UART_MSR_CTS */ )
1570                                 GMStatus[i].cts = 1;
1571                         else
1572                                 GMStatus[i].cts = 0;
1573                 }
1574                 if (copy_to_user(argp, GMStatus,
1575                                 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1576                         return -EFAULT;
1577                 return 0;
1578         case MOXA_ASPP_MON_EXT: {
1579                         int status;
1580                         int opmode, p;
1581                         int shiftbit;
1582                         unsigned cflag, iflag;
1583
1584                         for (i = 0; i < MXSER_PORTS; i++) {
1585                                 if (!mxvar_table[i].base)
1586                                         continue;
1587
1588                                 status = mxser_get_msr(mxvar_table[i].base, 0,
1589                                                         i, &(mxvar_table[i]));
1590                                 /*
1591                                 mxser_check_modem_status(&mxvar_table[i],
1592                                                                 status);
1593                                 */
1594                                 if (status & UART_MSR_TERI)
1595                                         mxvar_table[i].icount.rng++;
1596                                 if (status & UART_MSR_DDSR)
1597                                         mxvar_table[i].icount.dsr++;
1598                                 if (status & UART_MSR_DDCD)
1599                                         mxvar_table[i].icount.dcd++;
1600                                 if (status & UART_MSR_DCTS)
1601                                         mxvar_table[i].icount.cts++;
1602
1603                                 mxvar_table[i].mon_data.modem_status = status;
1604                                 mon_data_ext.rx_cnt[i] = mxvar_table[i].mon_data.rxcnt;
1605                                 mon_data_ext.tx_cnt[i] = mxvar_table[i].mon_data.txcnt;
1606                                 mon_data_ext.up_rxcnt[i] = mxvar_table[i].mon_data.up_rxcnt;
1607                                 mon_data_ext.up_txcnt[i] = mxvar_table[i].mon_data.up_txcnt;
1608                                 mon_data_ext.modem_status[i] = mxvar_table[i].mon_data.modem_status;
1609                                 mon_data_ext.baudrate[i] = mxvar_table[i].realbaud;
1610
1611                                 if (!mxvar_table[i].tty || !mxvar_table[i].tty->termios) {
1612                                         cflag = mxvar_table[i].normal_termios.c_cflag;
1613                                         iflag = mxvar_table[i].normal_termios.c_iflag;
1614                                 } else {
1615                                         cflag = mxvar_table[i].tty->termios->c_cflag;
1616                                         iflag = mxvar_table[i].tty->termios->c_iflag;
1617                                 }
1618
1619                                 mon_data_ext.databits[i] = cflag & CSIZE;
1620
1621                                 mon_data_ext.stopbits[i] = cflag & CSTOPB;
1622
1623                                 mon_data_ext.parity[i] = cflag & (PARENB | PARODD | CMSPAR);
1624
1625                                 mon_data_ext.flowctrl[i] = 0x00;
1626
1627                                 if (cflag & CRTSCTS)
1628                                         mon_data_ext.flowctrl[i] |= 0x03;
1629
1630                                 if (iflag & (IXON | IXOFF))
1631                                         mon_data_ext.flowctrl[i] |= 0x0C;
1632
1633                                 if (mxvar_table[i].type == PORT_16550A)
1634                                         mon_data_ext.fifo[i] = 1;
1635                                 else
1636                                         mon_data_ext.fifo[i] = 0;
1637
1638                                 p = i % 4;
1639                                 shiftbit = p * 2;
1640                                 opmode = inb(mxvar_table[i].opmode_ioaddr) >> shiftbit;
1641                                 opmode &= OP_MODE_MASK;
1642
1643                                 mon_data_ext.iftype[i] = opmode;
1644
1645                         }
1646                         if (copy_to_user(argp, &mon_data_ext, sizeof(struct mxser_mon_ext)))
1647                                 return -EFAULT;
1648
1649                         return 0;
1650
1651                 }
1652         default:
1653                 return -ENOIOCTLCMD;
1654         }
1655         return 0;
1656 }
1657
1658 static void mxser_stoprx(struct tty_struct *tty)
1659 {
1660         struct mxser_struct *info = tty->driver_data;
1661         /* unsigned long flags; */
1662
1663         info->ldisc_stop_rx = 1;
1664         if (I_IXOFF(tty)) {
1665                 /* MX_LOCK(&info->slock); */
1666                 /* following add by Victor Yu. 09-02-2002 */
1667                 if (info->IsMoxaMustChipFlag) {
1668                         info->IER &= ~MOXA_MUST_RECV_ISR;
1669                         outb(info->IER, info->base + UART_IER);
1670                 } else {
1671                         /* above add by Victor Yu. 09-02-2002 */
1672                         info->x_char = STOP_CHAR(tty);
1673                         /* mask by Victor Yu. 09-02-2002 */
1674                         /* outb(info->IER, 0); */
1675                         outb(0, info->base + UART_IER);
1676                         info->IER |= UART_IER_THRI;
1677                         /* force Tx interrupt */
1678                         outb(info->IER, info->base + UART_IER);
1679                 }               /* add by Victor Yu. 09-02-2002 */
1680                 /* MX_UNLOCK(&info->slock); */
1681         }
1682
1683         if (info->tty->termios->c_cflag & CRTSCTS) {
1684                 /* MX_LOCK(&info->slock); */
1685                 info->MCR &= ~UART_MCR_RTS;
1686                 outb(info->MCR, info->base + UART_MCR);
1687                 /* MX_UNLOCK(&info->slock); */
1688         }
1689 }
1690
1691 static void mxser_startrx(struct tty_struct *tty)
1692 {
1693         struct mxser_struct *info = tty->driver_data;
1694         /* unsigned long flags; */
1695
1696         info->ldisc_stop_rx = 0;
1697         if (I_IXOFF(tty)) {
1698                 if (info->x_char)
1699                         info->x_char = 0;
1700                 else {
1701                         /* MX_LOCK(&info->slock); */
1702
1703                         /* following add by Victor Yu. 09-02-2002 */
1704                         if (info->IsMoxaMustChipFlag) {
1705                                 info->IER |= MOXA_MUST_RECV_ISR;
1706                                 outb(info->IER, info->base + UART_IER);
1707                         } else {
1708                                 /* above add by Victor Yu. 09-02-2002 */
1709
1710                                 info->x_char = START_CHAR(tty);
1711                                 /* mask by Victor Yu. 09-02-2002 */
1712                                 /* outb(info->IER, 0); */
1713                                 /* add by Victor Yu. 09-02-2002 */
1714                                 outb(0, info->base + UART_IER);
1715                                 /* force Tx interrupt */
1716                                 info->IER |= UART_IER_THRI;
1717                                 outb(info->IER, info->base + UART_IER);
1718                         }       /* add by Victor Yu. 09-02-2002 */
1719                         /* MX_UNLOCK(&info->slock); */
1720                 }
1721         }
1722
1723         if (info->tty->termios->c_cflag & CRTSCTS) {
1724                 /* MX_LOCK(&info->slock); */
1725                 info->MCR |= UART_MCR_RTS;
1726                 outb(info->MCR, info->base + UART_MCR);
1727                 /* MX_UNLOCK(&info->slock); */
1728         }
1729 }
1730
1731 /*
1732  * This routine is called by the upper-layer tty layer to signal that
1733  * incoming characters should be throttled.
1734  */
1735 static void mxser_throttle(struct tty_struct *tty)
1736 {
1737         /* struct mxser_struct *info = tty->driver_data; */
1738         /* unsigned long flags; */
1739
1740         /* MX_LOCK(&info->slock); */
1741         mxser_stoprx(tty);
1742         /* MX_UNLOCK(&info->slock); */
1743 }
1744
1745 static void mxser_unthrottle(struct tty_struct *tty)
1746 {
1747         /* struct mxser_struct *info = tty->driver_data; */
1748         /* unsigned long flags; */
1749
1750         /* MX_LOCK(&info->slock); */
1751         mxser_startrx(tty);
1752         /* MX_UNLOCK(&info->slock); */
1753 }
1754
1755 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1756 {
1757         struct mxser_struct *info = tty->driver_data;
1758         unsigned long flags;
1759
1760         if ((tty->termios->c_cflag != old_termios->c_cflag) ||
1761                         (RELEVANT_IFLAG(tty->termios->c_iflag) != RELEVANT_IFLAG(old_termios->c_iflag))) {
1762
1763                 mxser_change_speed(info, old_termios);
1764
1765                 if ((old_termios->c_cflag & CRTSCTS) &&
1766                                 !(tty->termios->c_cflag & CRTSCTS)) {
1767                         tty->hw_stopped = 0;
1768                         mxser_start(tty);
1769                 }
1770         }
1771
1772 /* Handle sw stopped */
1773         if ((old_termios->c_iflag & IXON) &&
1774                         !(tty->termios->c_iflag & IXON)) {
1775                 tty->stopped = 0;
1776
1777                 /* following add by Victor Yu. 09-02-2002 */
1778                 if (info->IsMoxaMustChipFlag) {
1779                         spin_lock_irqsave(&info->slock, flags);
1780                         DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base);
1781                         spin_unlock_irqrestore(&info->slock, flags);
1782                 }
1783                 /* above add by Victor Yu. 09-02-2002 */
1784
1785                 mxser_start(tty);
1786         }
1787 }
1788
1789 /*
1790  * mxser_stop() and mxser_start()
1791  *
1792  * This routines are called before setting or resetting tty->stopped.
1793  * They enable or disable transmitter interrupts, as necessary.
1794  */
1795 static void mxser_stop(struct tty_struct *tty)
1796 {
1797         struct mxser_struct *info = tty->driver_data;
1798         unsigned long flags;
1799
1800         spin_lock_irqsave(&info->slock, flags);
1801         if (info->IER & UART_IER_THRI) {
1802                 info->IER &= ~UART_IER_THRI;
1803                 outb(info->IER, info->base + UART_IER);
1804         }
1805         spin_unlock_irqrestore(&info->slock, flags);
1806 }
1807
1808 static void mxser_start(struct tty_struct *tty)
1809 {
1810         struct mxser_struct *info = tty->driver_data;
1811         unsigned long flags;
1812
1813         spin_lock_irqsave(&info->slock, flags);
1814         if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
1815                 info->IER |= UART_IER_THRI;
1816                 outb(info->IER, info->base + UART_IER);
1817         }
1818         spin_unlock_irqrestore(&info->slock, flags);
1819 }
1820
1821 /*
1822  * mxser_wait_until_sent() --- wait until the transmitter is empty
1823  */
1824 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1825 {
1826         struct mxser_struct *info = tty->driver_data;
1827         unsigned long orig_jiffies, char_time;
1828         int lsr;
1829
1830         if (info->type == PORT_UNKNOWN)
1831                 return;
1832
1833         if (info->xmit_fifo_size == 0)
1834                 return;         /* Just in case.... */
1835
1836         orig_jiffies = jiffies;
1837         /*
1838          * Set the check interval to be 1/5 of the estimated time to
1839          * send a single character, and make it at least 1.  The check
1840          * interval should also be less than the timeout.
1841          *
1842          * Note: we have to use pretty tight timings here to satisfy
1843          * the NIST-PCTS.
1844          */
1845         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1846         char_time = char_time / 5;
1847         if (char_time == 0)
1848                 char_time = 1;
1849         if (timeout && timeout < char_time)
1850                 char_time = timeout;
1851         /*
1852          * If the transmitter hasn't cleared in twice the approximate
1853          * amount of time to send the entire FIFO, it probably won't
1854          * ever clear.  This assumes the UART isn't doing flow
1855          * control, which is currently the case.  Hence, if it ever
1856          * takes longer than info->timeout, this is probably due to a
1857          * UART bug of some kind.  So, we clamp the timeout parameter at
1858          * 2*info->timeout.
1859          */
1860         if (!timeout || timeout > 2 * info->timeout)
1861                 timeout = 2 * info->timeout;
1862 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1863         printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
1864                 timeout, char_time);
1865         printk("jiff=%lu...", jiffies);
1866 #endif
1867         while (!((lsr = inb(info->base + UART_LSR)) & UART_LSR_TEMT)) {
1868 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1869                 printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
1870 #endif
1871                 schedule_timeout_interruptible(char_time);
1872                 if (signal_pending(current))
1873                         break;
1874                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1875                         break;
1876         }
1877         set_current_state(TASK_RUNNING);
1878
1879 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1880         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1881 #endif
1882 }
1883
1884
1885 /*
1886  * This routine is called by tty_hangup() when a hangup is signaled.
1887  */
1888 void mxser_hangup(struct tty_struct *tty)
1889 {
1890         struct mxser_struct *info = tty->driver_data;
1891
1892         mxser_flush_buffer(tty);
1893         mxser_shutdown(info);
1894         info->event = 0;
1895         info->count = 0;
1896         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1897         info->tty = NULL;
1898         wake_up_interruptible(&info->open_wait);
1899 }
1900
1901
1902 /* added by James 03-12-2004. */
1903 /*
1904  * mxser_rs_break() --- routine which turns the break handling on or off
1905  */
1906 static void mxser_rs_break(struct tty_struct *tty, int break_state)
1907 {
1908         struct mxser_struct *info = tty->driver_data;
1909         unsigned long flags;
1910
1911         spin_lock_irqsave(&info->slock, flags);
1912         if (break_state == -1)
1913                 outb(inb(info->base + UART_LCR) | UART_LCR_SBC,
1914                         info->base + UART_LCR);
1915         else
1916                 outb(inb(info->base + UART_LCR) & ~UART_LCR_SBC,
1917                         info->base + UART_LCR);
1918         spin_unlock_irqrestore(&info->slock, flags);
1919 }
1920
1921 /* (above) added by James. */
1922
1923
1924 /*
1925  * This is the serial driver's generic interrupt routine
1926  */
1927 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
1928 {
1929         int status, iir, i;
1930         struct mxser_struct *info;
1931         struct mxser_struct *port;
1932         int max, irqbits, bits, msr;
1933         int pass_counter = 0;
1934         int handled = IRQ_NONE;
1935
1936         port = NULL;
1937         /* spin_lock(&gm_lock); */
1938
1939         for (i = 0; i < MXSER_BOARDS; i++) {
1940                 if (dev_id == &(mxvar_table[i * MXSER_PORTS_PER_BOARD])) {
1941                         port = dev_id;
1942                         break;
1943                 }
1944         }
1945
1946         if (i == MXSER_BOARDS)
1947                 goto irq_stop;
1948         if (port == 0)
1949                 goto irq_stop;
1950         max = mxser_numports[mxsercfg[i].board_type - 1];
1951         while (1) {
1952                 irqbits = inb(port->vector) & port->vectormask;
1953                 if (irqbits == port->vectormask)
1954                         break;
1955
1956                 handled = IRQ_HANDLED;
1957                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
1958                         if (irqbits == port->vectormask)
1959                                 break;
1960                         if (bits & irqbits)
1961                                 continue;
1962                         info = port + i;
1963
1964                         /* following add by Victor Yu. 09-13-2002 */
1965                         iir = inb(info->base + UART_IIR);
1966                         if (iir & UART_IIR_NO_INT)
1967                                 continue;
1968                         iir &= MOXA_MUST_IIR_MASK;
1969                         if (!info->tty) {
1970                                 status = inb(info->base + UART_LSR);
1971                                 outb(0x27, info->base + UART_FCR);
1972                                 inb(info->base + UART_MSR);
1973                                 continue;
1974                         }
1975                         /* above add by Victor Yu. 09-13-2002 */
1976                         /*
1977                            if (info->tty->flip.count < TTY_FLIPBUF_SIZE / 4) {
1978                            info->IER |= MOXA_MUST_RECV_ISR;
1979                            outb(info->IER, info->base + UART_IER);
1980                            }
1981                          */
1982
1983
1984                         /* mask by Victor Yu. 09-13-2002
1985                            if ( !info->tty ||
1986                            (inb(info->base + UART_IIR) & UART_IIR_NO_INT) )
1987                            continue;
1988                          */
1989                         /* mask by Victor Yu. 09-02-2002
1990                            status = inb(info->base + UART_LSR) & info->read_status_mask;
1991                          */
1992
1993                         /* following add by Victor Yu. 09-02-2002 */
1994                         status = inb(info->base + UART_LSR);
1995
1996                         if (status & UART_LSR_PE)
1997                                 info->err_shadow |= NPPI_NOTIFY_PARITY;
1998                         if (status & UART_LSR_FE)
1999                                 info->err_shadow |= NPPI_NOTIFY_FRAMING;
2000                         if (status & UART_LSR_OE)
2001                                 info->err_shadow |= NPPI_NOTIFY_HW_OVERRUN;
2002                         if (status & UART_LSR_BI)
2003                                 info->err_shadow |= NPPI_NOTIFY_BREAK;
2004
2005                         if (info->IsMoxaMustChipFlag) {
2006                                 /*
2007                                    if ( (status & 0x02) && !(status & 0x01) ) {
2008                                    outb(info->base+UART_FCR,  0x23);
2009                                    continue;
2010                                    }
2011                                  */
2012                                 if (iir == MOXA_MUST_IIR_GDA ||
2013                                                 iir == MOXA_MUST_IIR_RDA ||
2014                                                 iir == MOXA_MUST_IIR_RTO ||
2015                                                 iir == MOXA_MUST_IIR_LSR)
2016                                         mxser_receive_chars(info, &status);
2017
2018                         } else {
2019                                 /* above add by Victor Yu. 09-02-2002 */
2020
2021                                 status &= info->read_status_mask;
2022                                 if (status & UART_LSR_DR)
2023                                         mxser_receive_chars(info, &status);
2024                         }
2025                         msr = inb(info->base + UART_MSR);
2026                         if (msr & UART_MSR_ANY_DELTA) {
2027                                 mxser_check_modem_status(info, msr);
2028                         }
2029                         /* following add by Victor Yu. 09-13-2002 */
2030                         if (info->IsMoxaMustChipFlag) {
2031                                 if ((iir == 0x02) && (status & UART_LSR_THRE)) {
2032                                         mxser_transmit_chars(info);
2033                                 }
2034                         } else {
2035                                 /* above add by Victor Yu. 09-13-2002 */
2036
2037                                 if (status & UART_LSR_THRE) {
2038 /* 8-2-99 by William
2039                             if ( info->x_char || (info->xmit_cnt > 0) )
2040 */
2041                                         mxser_transmit_chars(info);
2042                                 }
2043                         }
2044                 }
2045                 if (pass_counter++ > MXSER_ISR_PASS_LIMIT) {
2046                         break;  /* Prevent infinite loops */
2047                 }
2048         }
2049
2050       irq_stop:
2051         /* spin_unlock(&gm_lock); */
2052         return handled;
2053 }
2054
2055 static void mxser_receive_chars(struct mxser_struct *info, int *status)
2056 {
2057         struct tty_struct *tty = info->tty;
2058         unsigned char ch, gdl;
2059         int ignored = 0;
2060         int cnt = 0;
2061         int recv_room;
2062         int max = 256;
2063         unsigned long flags;
2064
2065         spin_lock_irqsave(&info->slock, flags);
2066
2067         recv_room = tty->receive_room;
2068         if ((recv_room == 0) && (!info->ldisc_stop_rx)) {
2069                 /* mxser_throttle(tty); */
2070                 mxser_stoprx(tty);
2071                 /* return; */
2072         }
2073
2074         /* following add by Victor Yu. 09-02-2002 */
2075         if (info->IsMoxaMustChipFlag != MOXA_OTHER_UART) {
2076
2077                 if (*status & UART_LSR_SPECIAL) {
2078                         goto intr_old;
2079                 }
2080                 /* following add by Victor Yu. 02-11-2004 */
2081                 if (info->IsMoxaMustChipFlag == MOXA_MUST_MU860_HWID &&
2082                                 (*status & MOXA_MUST_LSR_RERR))
2083                         goto intr_old;
2084                 /* above add by Victor Yu. 02-14-2004 */
2085                 if (*status & MOXA_MUST_LSR_RERR)
2086                         goto intr_old;
2087
2088                 gdl = inb(info->base + MOXA_MUST_GDL_REGISTER);
2089
2090                 /* add by Victor Yu. 02-11-2004 */
2091                 if (info->IsMoxaMustChipFlag == MOXA_MUST_MU150_HWID)
2092                         gdl &= MOXA_MUST_GDL_MASK;
2093                 if (gdl >= recv_room) {
2094                         if (!info->ldisc_stop_rx) {
2095                                 /* mxser_throttle(tty); */
2096                                 mxser_stoprx(tty);
2097                         }
2098                         /* return; */
2099                 }
2100                 while (gdl--) {
2101                         ch = inb(info->base + UART_RX);
2102                         tty_insert_flip_char(tty, ch, 0);
2103                         cnt++;
2104                         /*
2105                            if ((cnt >= HI_WATER) && (info->stop_rx == 0)) {
2106                            mxser_stoprx(tty);
2107                            info->stop_rx = 1;
2108                            break;
2109                            } */
2110                 }
2111                 goto end_intr;
2112         }
2113  intr_old:
2114         /* above add by Victor Yu. 09-02-2002 */
2115
2116         do {
2117                 if (max-- < 0)
2118                         break;
2119                 /*
2120                    if ((cnt >= HI_WATER) && (info->stop_rx == 0)) {
2121                    mxser_stoprx(tty);
2122                    info->stop_rx=1;
2123                    break;
2124                    }
2125                  */
2126
2127                 ch = inb(info->base + UART_RX);
2128                 /* following add by Victor Yu. 09-02-2002 */
2129                 if (info->IsMoxaMustChipFlag && (*status & UART_LSR_OE) /*&& !(*status&UART_LSR_DR) */ )
2130                         outb(0x23, info->base + UART_FCR);
2131                 *status &= info->read_status_mask;
2132                 /* above add by Victor Yu. 09-02-2002 */
2133                 if (*status & info->ignore_status_mask) {
2134                         if (++ignored > 100)
2135                                 break;
2136                 } else {
2137                         char flag = 0;
2138                         if (*status & UART_LSR_SPECIAL) {
2139                                 if (*status & UART_LSR_BI) {
2140                                         flag = TTY_BREAK;
2141 /* added by casper 1/11/2000 */
2142                                         info->icount.brk++;
2143 /* */
2144                                         if (info->flags & ASYNC_SAK)
2145                                                 do_SAK(tty);
2146                                 } else if (*status & UART_LSR_PE) {
2147                                         flag = TTY_PARITY;
2148 /* added by casper 1/11/2000 */
2149                                         info->icount.parity++;
2150 /* */
2151                                 } else if (*status & UART_LSR_FE) {
2152                                         flag = TTY_FRAME;
2153 /* added by casper 1/11/2000 */
2154                                         info->icount.frame++;
2155 /* */
2156                                 } else if (*status & UART_LSR_OE) {
2157                                         flag = TTY_OVERRUN;
2158 /* added by casper 1/11/2000 */
2159                                         info->icount.overrun++;
2160 /* */
2161                                 }
2162                         }
2163                         tty_insert_flip_char(tty, ch, flag);
2164                         cnt++;
2165                         if (cnt >= recv_room) {
2166                                 if (!info->ldisc_stop_rx) {
2167                                         /* mxser_throttle(tty); */
2168                                         mxser_stoprx(tty);
2169                                 }
2170                                 break;
2171                         }
2172
2173                 }
2174
2175                 /* following add by Victor Yu. 09-02-2002 */
2176                 if (info->IsMoxaMustChipFlag)
2177                         break;
2178                 /* above add by Victor Yu. 09-02-2002 */
2179
2180                 /* mask by Victor Yu. 09-02-2002
2181                  *status = inb(info->base + UART_LSR) & info->read_status_mask;
2182                  */
2183                 /* following add by Victor Yu. 09-02-2002 */
2184                 *status = inb(info->base + UART_LSR);
2185                 /* above add by Victor Yu. 09-02-2002 */
2186         } while (*status & UART_LSR_DR);
2187
2188 end_intr:               /* add by Victor Yu. 09-02-2002 */
2189         mxvar_log.rxcnt[info->port] += cnt;
2190         info->mon_data.rxcnt += cnt;
2191         info->mon_data.up_rxcnt += cnt;
2192         spin_unlock_irqrestore(&info->slock, flags);
2193
2194         tty_flip_buffer_push(tty);
2195 }
2196
2197 static void mxser_transmit_chars(struct mxser_struct *info)
2198 {
2199         int count, cnt;
2200         unsigned long flags;
2201
2202         spin_lock_irqsave(&info->slock, flags);
2203
2204         if (info->x_char) {
2205                 outb(info->x_char, info->base + UART_TX);
2206                 info->x_char = 0;
2207                 mxvar_log.txcnt[info->port]++;
2208                 info->mon_data.txcnt++;
2209                 info->mon_data.up_txcnt++;
2210
2211 /* added by casper 1/11/2000 */
2212                 info->icount.tx++;
2213 /* */
2214                 spin_unlock_irqrestore(&info->slock, flags);
2215                 return;
2216         }
2217
2218         if (info->xmit_buf == 0) {
2219                 spin_unlock_irqrestore(&info->slock, flags);
2220                 return;
2221         }
2222
2223         if ((info->xmit_cnt <= 0) || info->tty->stopped ||
2224                         (info->tty->hw_stopped &&
2225                         (info->type != PORT_16550A) &&
2226                         (!info->IsMoxaMustChipFlag))) {
2227                 info->IER &= ~UART_IER_THRI;
2228                 outb(info->IER, info->base + UART_IER);
2229                 spin_unlock_irqrestore(&info->slock, flags);
2230                 return;
2231         }
2232
2233         cnt = info->xmit_cnt;
2234         count = info->xmit_fifo_size;
2235         do {
2236                 outb(info->xmit_buf[info->xmit_tail++],
2237                         info->base + UART_TX);
2238                 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2239                 if (--info->xmit_cnt <= 0)
2240                         break;
2241         } while (--count > 0);
2242         mxvar_log.txcnt[info->port] += (cnt - info->xmit_cnt);
2243
2244 /* added by James 03-12-2004. */
2245         info->mon_data.txcnt += (cnt - info->xmit_cnt);
2246         info->mon_data.up_txcnt += (cnt - info->xmit_cnt);
2247 /* (above) added by James. */
2248
2249 /* added by casper 1/11/2000 */
2250         info->icount.tx += (cnt - info->xmit_cnt);
2251 /* */
2252
2253         if (info->xmit_cnt < WAKEUP_CHARS) {
2254                 set_bit(MXSER_EVENT_TXLOW, &info->event);
2255                 schedule_work(&info->tqueue);
2256         }
2257         if (info->xmit_cnt <= 0) {
2258                 info->IER &= ~UART_IER_THRI;
2259                 outb(info->IER, info->base + UART_IER);
2260         }
2261         spin_unlock_irqrestore(&info->slock, flags);
2262 }
2263
2264 static void mxser_check_modem_status(struct mxser_struct *info, int status)
2265 {
2266         /* update input line counters */
2267         if (status & UART_MSR_TERI)
2268                 info->icount.rng++;
2269         if (status & UART_MSR_DDSR)
2270                 info->icount.dsr++;
2271         if (status & UART_MSR_DDCD)
2272                 info->icount.dcd++;
2273         if (status & UART_MSR_DCTS)
2274                 info->icount.cts++;
2275         info->mon_data.modem_status = status;
2276         wake_up_interruptible(&info->delta_msr_wait);
2277
2278         if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
2279                 if (status & UART_MSR_DCD)
2280                         wake_up_interruptible(&info->open_wait);
2281                 schedule_work(&info->tqueue);
2282         }
2283
2284         if (info->flags & ASYNC_CTS_FLOW) {
2285                 if (info->tty->hw_stopped) {
2286                         if (status & UART_MSR_CTS) {
2287                                 info->tty->hw_stopped = 0;
2288
2289                                 if ((info->type != PORT_16550A) &&
2290                                                 (!info->IsMoxaMustChipFlag)) {
2291                                         info->IER |= UART_IER_THRI;
2292                                         outb(info->IER, info->base + UART_IER);
2293                                 }
2294                                 set_bit(MXSER_EVENT_TXLOW, &info->event);
2295                                 schedule_work(&info->tqueue);                   }
2296                 } else {
2297                         if (!(status & UART_MSR_CTS)) {
2298                                 info->tty->hw_stopped = 1;
2299                                 if ((info->type != PORT_16550A) &&
2300                                                 (!info->IsMoxaMustChipFlag)) {
2301                                         info->IER &= ~UART_IER_THRI;
2302                                         outb(info->IER, info->base + UART_IER);
2303                                 }
2304                         }
2305                 }
2306         }
2307 }
2308
2309 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp, struct mxser_struct *info)
2310 {
2311         DECLARE_WAITQUEUE(wait, current);
2312         int retval;
2313         int do_clocal = 0;
2314         unsigned long flags;
2315
2316         /*
2317          * If non-blocking mode is set, or the port is not enabled,
2318          * then make the check up front and then exit.
2319          */
2320         if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) {
2321                 info->flags |= ASYNC_NORMAL_ACTIVE;
2322                 return 0;
2323         }
2324
2325         if (tty->termios->c_cflag & CLOCAL)
2326                 do_clocal = 1;
2327
2328         /*
2329          * Block waiting for the carrier detect and the line to become
2330          * free (i.e., not in use by the callout).  While we are in
2331          * this loop, info->count is dropped by one, so that
2332          * mxser_close() knows when to free things.  We restore it upon
2333          * exit, either normal or abnormal.
2334          */
2335         retval = 0;
2336         add_wait_queue(&info->open_wait, &wait);
2337
2338         spin_lock_irqsave(&info->slock, flags);
2339         if (!tty_hung_up_p(filp))
2340                 info->count--;
2341         spin_unlock_irqrestore(&info->slock, flags);
2342         info->blocked_open++;
2343         while (1) {
2344                 spin_lock_irqsave(&info->slock, flags);
2345                 outb(inb(info->base + UART_MCR) |
2346                         UART_MCR_DTR | UART_MCR_RTS, info->base + UART_MCR);
2347                 spin_unlock_irqrestore(&info->slock, flags);
2348                 set_current_state(TASK_INTERRUPTIBLE);
2349                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)) {
2350                         if (info->flags & ASYNC_HUP_NOTIFY)
2351                                 retval = -EAGAIN;
2352                         else
2353                                 retval = -ERESTARTSYS;
2354                         break;
2355                 }
2356                 if (!(info->flags & ASYNC_CLOSING) &&
2357                                 (do_clocal ||
2358                                 (inb(info->base + UART_MSR) & UART_MSR_DCD)))
2359                         break;
2360                 if (signal_pending(current)) {
2361                         retval = -ERESTARTSYS;
2362                         break;
2363                 }
2364                 schedule();
2365         }
2366         set_current_state(TASK_RUNNING);
2367         remove_wait_queue(&info->open_wait, &wait);
2368         if (!tty_hung_up_p(filp))
2369                 info->count++;
2370         info->blocked_open--;
2371         if (retval)
2372                 return retval;
2373         info->flags |= ASYNC_NORMAL_ACTIVE;
2374         return 0;
2375 }
2376
2377 static int mxser_startup(struct mxser_struct *info)
2378 {
2379         unsigned long page;
2380         unsigned long flags;
2381
2382         page = __get_free_page(GFP_KERNEL);
2383         if (!page)
2384                 return -ENOMEM;
2385
2386         spin_lock_irqsave(&info->slock, flags);
2387
2388         if (info->flags & ASYNC_INITIALIZED) {
2389                 free_page(page);
2390                 spin_unlock_irqrestore(&info->slock, flags);
2391                 return 0;
2392         }
2393
2394         if (!info->base || !info->type) {
2395                 if (info->tty)
2396                         set_bit(TTY_IO_ERROR, &info->tty->flags);
2397                 free_page(page);
2398                 spin_unlock_irqrestore(&info->slock, flags);
2399                 return 0;
2400         }
2401         if (info->xmit_buf)
2402                 free_page(page);
2403         else
2404                 info->xmit_buf = (unsigned char *) page;
2405
2406         /*
2407          * Clear the FIFO buffers and disable them
2408          * (they will be reenabled in mxser_change_speed())
2409          */
2410         if (info->IsMoxaMustChipFlag)
2411                 outb((UART_FCR_CLEAR_RCVR |
2412                         UART_FCR_CLEAR_XMIT |
2413                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->base + UART_FCR);
2414         else
2415                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
2416                         info->base + UART_FCR);
2417
2418         /*
2419          * At this point there's no way the LSR could still be 0xFF;
2420          * if it is, then bail out, because there's likely no UART
2421          * here.
2422          */
2423         if (inb(info->base + UART_LSR) == 0xff) {
2424                 spin_unlock_irqrestore(&info->slock, flags);
2425                 if (capable(CAP_SYS_ADMIN)) {
2426                         if (info->tty)
2427                                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2428                         return 0;
2429                 } else
2430                         return -ENODEV;
2431         }
2432
2433         /*
2434          * Clear the interrupt registers.
2435          */
2436         (void) inb(info->base + UART_LSR);
2437         (void) inb(info->base + UART_RX);
2438         (void) inb(info->base + UART_IIR);
2439         (void) inb(info->base + UART_MSR);
2440
2441         /*
2442          * Now, initialize the UART
2443          */
2444         outb(UART_LCR_WLEN8, info->base + UART_LCR);    /* reset DLAB */
2445         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
2446         outb(info->MCR, info->base + UART_MCR);
2447
2448         /*
2449          * Finally, enable interrupts
2450          */
2451         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
2452         /* info->IER = UART_IER_RLSI | UART_IER_RDI; */
2453
2454         /* following add by Victor Yu. 08-30-2002 */
2455         if (info->IsMoxaMustChipFlag)
2456                 info->IER |= MOXA_MUST_IER_EGDAI;
2457         /* above add by Victor Yu. 08-30-2002 */
2458         outb(info->IER, info->base + UART_IER); /* enable interrupts */
2459
2460         /*
2461          * And clear the interrupt registers again for luck.
2462          */
2463         (void) inb(info->base + UART_LSR);
2464         (void) inb(info->base + UART_RX);
2465         (void) inb(info->base + UART_IIR);
2466         (void) inb(info->base + UART_MSR);
2467
2468         if (info->tty)
2469                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2470         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2471
2472         /*
2473          * and set the speed of the serial port
2474          */
2475         spin_unlock_irqrestore(&info->slock, flags);
2476         mxser_change_speed(info, NULL);
2477
2478         info->flags |= ASYNC_INITIALIZED;
2479         return 0;
2480 }
2481
2482 /*
2483  * This routine will shutdown a serial port; interrupts maybe disabled, and
2484  * DTR is dropped if the hangup on close termio flag is on.
2485  */
2486 static void mxser_shutdown(struct mxser_struct *info)
2487 {
2488         unsigned long flags;
2489
2490         if (!(info->flags & ASYNC_INITIALIZED))
2491                 return;
2492
2493         spin_lock_irqsave(&info->slock, flags);
2494
2495         /*
2496          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
2497          * here so the queue might never be waken up
2498          */
2499         wake_up_interruptible(&info->delta_msr_wait);
2500
2501         /*
2502          * Free the IRQ, if necessary
2503          */
2504         if (info->xmit_buf) {
2505                 free_page((unsigned long) info->xmit_buf);
2506                 info->xmit_buf = NULL;
2507         }
2508
2509         info->IER = 0;
2510         outb(0x00, info->base + UART_IER);
2511
2512         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
2513                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
2514         outb(info->MCR, info->base + UART_MCR);
2515
2516         /* clear Rx/Tx FIFO's */
2517         /* following add by Victor Yu. 08-30-2002 */
2518         if (info->IsMoxaMustChipFlag)
2519                 outb((UART_FCR_CLEAR_RCVR |
2520                         UART_FCR_CLEAR_XMIT |
2521                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->base + UART_FCR);
2522         else
2523                 /* above add by Victor Yu. 08-30-2002 */
2524                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
2525                         info->base + UART_FCR);
2526
2527         /* read data port to reset things */
2528         (void) inb(info->base + UART_RX);
2529
2530         if (info->tty)
2531                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2532
2533         info->flags &= ~ASYNC_INITIALIZED;
2534
2535         /* following add by Victor Yu. 09-23-2002 */
2536         if (info->IsMoxaMustChipFlag)
2537                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->base);
2538         /* above add by Victor Yu. 09-23-2002 */
2539
2540         spin_unlock_irqrestore(&info->slock, flags);
2541 }
2542
2543 /*
2544  * This routine is called to set the UART divisor registers to match
2545  * the specified baud rate for a serial port.
2546  */
2547 static int mxser_change_speed(struct mxser_struct *info, struct ktermios *old_termios)
2548 {
2549         unsigned cflag, cval, fcr;
2550         int ret = 0;
2551         unsigned char status;
2552         long baud;
2553         unsigned long flags;
2554
2555         if (!info->tty || !info->tty->termios)
2556                 return ret;
2557         cflag = info->tty->termios->c_cflag;
2558         if (!(info->base))
2559                 return ret;
2560
2561 #ifndef B921600
2562 #define B921600 (B460800 +1)
2563 #endif
2564         if (mxser_set_baud_method[info->port] == 0) {
2565                 baud = tty_get_baud_rate(info->tty);
2566                 mxser_set_baud(info, baud);
2567         }
2568
2569         /* byte size and parity */
2570         switch (cflag & CSIZE) {
2571         case CS5:
2572                 cval = 0x00;
2573                 break;
2574         case CS6:
2575                 cval = 0x01;
2576                 break;
2577         case CS7:
2578                 cval = 0x02;
2579                 break;
2580         case CS8:
2581                 cval = 0x03;
2582                 break;
2583         default:
2584                 cval = 0x00;
2585                 break;          /* too keep GCC shut... */
2586         }
2587         if (cflag & CSTOPB)
2588                 cval |= 0x04;
2589         if (cflag & PARENB)
2590                 cval |= UART_LCR_PARITY;
2591         if (!(cflag & PARODD))
2592                 cval |= UART_LCR_EPAR;
2593         if (cflag & CMSPAR)
2594                 cval |= UART_LCR_SPAR;
2595
2596         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
2597                 if (info->IsMoxaMustChipFlag) {
2598                         fcr = UART_FCR_ENABLE_FIFO;
2599                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
2600                         SET_MOXA_MUST_FIFO_VALUE(info);
2601                 } else
2602                         fcr = 0;
2603         } else {
2604                 fcr = UART_FCR_ENABLE_FIFO;
2605                 /* following add by Victor Yu. 08-30-2002 */
2606                 if (info->IsMoxaMustChipFlag) {
2607                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
2608                         SET_MOXA_MUST_FIFO_VALUE(info);
2609                 } else {
2610                         /* above add by Victor Yu. 08-30-2002 */
2611                         switch (info->rx_trigger) {
2612                         case 1:
2613                                 fcr |= UART_FCR_TRIGGER_1;
2614                                 break;
2615                         case 4:
2616                                 fcr |= UART_FCR_TRIGGER_4;
2617                                 break;
2618                         case 8:
2619                                 fcr |= UART_FCR_TRIGGER_8;
2620                                 break;
2621                         default:
2622                                 fcr |= UART_FCR_TRIGGER_14;
2623                                 break;
2624                         }
2625                 }
2626         }
2627
2628         /* CTS flow control flag and modem status interrupts */
2629         info->IER &= ~UART_IER_MSI;
2630         info->MCR &= ~UART_MCR_AFE;
2631         if (cflag & CRTSCTS) {
2632                 info->flags |= ASYNC_CTS_FLOW;
2633                 info->IER |= UART_IER_MSI;
2634                 if ((info->type == PORT_16550A) || (info->IsMoxaMustChipFlag)) {
2635                         info->MCR |= UART_MCR_AFE;
2636                         /* status = mxser_get_msr(info->base, 0, info->port); */
2637 /*
2638         save_flags(flags);
2639         cli();
2640         status = inb(baseaddr + UART_MSR);
2641         restore_flags(flags);
2642 */
2643                         /* mxser_check_modem_status(info, status); */
2644                 } else {
2645                         /* status = mxser_get_msr(info->base, 0, info->port); */
2646                         /* MX_LOCK(&info->slock); */
2647                         status = inb(info->base + UART_MSR);
2648                         /* MX_UNLOCK(&info->slock); */
2649                         if (info->tty->hw_stopped) {
2650                                 if (status & UART_MSR_CTS) {
2651                                         info->tty->hw_stopped = 0;
2652                                         if ((info->type != PORT_16550A) &&
2653                                                         (!info->IsMoxaMustChipFlag)) {
2654                                                 info->IER |= UART_IER_THRI;
2655                                                 outb(info->IER, info->base + UART_IER);
2656                                         }
2657                                         set_bit(MXSER_EVENT_TXLOW, &info->event);
2658                                         schedule_work(&info->tqueue);                           }
2659                         } else {
2660                                 if (!(status & UART_MSR_CTS)) {
2661                                         info->tty->hw_stopped = 1;
2662                                         if ((info->type != PORT_16550A) &&
2663                                                         (!info->IsMoxaMustChipFlag)) {
2664                                                 info->IER &= ~UART_IER_THRI;
2665                                                 outb(info->IER, info->base + UART_IER);
2666                                         }
2667                                 }
2668                         }
2669                 }
2670         } else {
2671                 info->flags &= ~ASYNC_CTS_FLOW;
2672         }
2673         outb(info->MCR, info->base + UART_MCR);
2674         if (cflag & CLOCAL) {
2675                 info->flags &= ~ASYNC_CHECK_CD;
2676         } else {
2677                 info->flags |= ASYNC_CHECK_CD;
2678                 info->IER |= UART_IER_MSI;
2679         }
2680         outb(info->IER, info->base + UART_IER);
2681
2682         /*
2683          * Set up parity check flag
2684          */
2685         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
2686         if (I_INPCK(info->tty))
2687                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
2688         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2689                 info->read_status_mask |= UART_LSR_BI;
2690
2691         info->ignore_status_mask = 0;
2692
2693         if (I_IGNBRK(info->tty)) {
2694                 info->ignore_status_mask |= UART_LSR_BI;
2695                 info->read_status_mask |= UART_LSR_BI;
2696                 /*
2697                  * If we're ignore parity and break indicators, ignore
2698                  * overruns too.  (For real raw support).
2699                  */
2700                 if (I_IGNPAR(info->tty)) {
2701                         info->ignore_status_mask |=
2702                                                 UART_LSR_OE |
2703                                                 UART_LSR_PE |
2704                                                 UART_LSR_FE;
2705                         info->read_status_mask |=
2706                                                 UART_LSR_OE |
2707                                                 UART_LSR_PE |
2708                                                 UART_LSR_FE;
2709                 }
2710         }
2711         /* following add by Victor Yu. 09-02-2002 */
2712         if (info->IsMoxaMustChipFlag) {
2713                 spin_lock_irqsave(&info->slock, flags);
2714                 SET_MOXA_MUST_XON1_VALUE(info->base, START_CHAR(info->tty));
2715                 SET_MOXA_MUST_XOFF1_VALUE(info->base, STOP_CHAR(info->tty));
2716                 if (I_IXON(info->tty)) {
2717                         ENABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base);
2718                 } else {
2719                         DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->base);
2720                 }
2721                 if (I_IXOFF(info->tty)) {
2722                         ENABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->base);
2723                 } else {
2724                         DISABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->base);
2725                 }
2726                 /*
2727                    if ( I_IXANY(info->tty) ) {
2728                    info->MCR |= MOXA_MUST_MCR_XON_ANY;
2729                    ENABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->base);
2730                    } else {
2731                    info->MCR &= ~MOXA_MUST_MCR_XON_ANY;
2732                    DISABLE_MOXA_MUST_XON_ANY_FLOW_CONTROL(info->base);
2733                    }
2734                  */
2735                 spin_unlock_irqrestore(&info->slock, flags);
2736         }
2737         /* above add by Victor Yu. 09-02-2002 */
2738
2739
2740         outb(fcr, info->base + UART_FCR);       /* set fcr */
2741         outb(cval, info->base + UART_LCR);
2742
2743         return ret;
2744 }
2745
2746
2747 static int mxser_set_baud(struct mxser_struct *info, long newspd)
2748 {
2749         int quot = 0;
2750         unsigned char cval;
2751         int ret = 0;
2752         unsigned long flags;
2753
2754         if (!info->tty || !info->tty->termios)
2755                 return ret;
2756
2757         if (!(info->base))
2758                 return ret;
2759
2760         if (newspd > info->MaxCanSetBaudRate)
2761                 return 0;
2762
2763         info->realbaud = newspd;
2764         if (newspd == 134) {
2765                 quot = (2 * info->baud_base / 269);
2766         } else if (newspd) {
2767                 quot = info->baud_base / newspd;
2768                 if (quot == 0)
2769                         quot = 1;
2770         } else {
2771                 quot = 0;
2772         }
2773
2774         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
2775         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
2776
2777         if (quot) {
2778                 spin_lock_irqsave(&info->slock, flags);
2779                 info->MCR |= UART_MCR_DTR;
2780                 outb(info->MCR, info->base + UART_MCR);
2781                 spin_unlock_irqrestore(&info->slock, flags);
2782         } else {
2783                 spin_lock_irqsave(&info->slock, flags);
2784                 info->MCR &= ~UART_MCR_DTR;
2785                 outb(info->MCR, info->base + UART_MCR);
2786                 spin_unlock_irqrestore(&info->slock, flags);
2787                 return ret;
2788         }
2789
2790         cval = inb(info->base + UART_LCR);
2791
2792         outb(cval | UART_LCR_DLAB, info->base + UART_LCR);      /* set DLAB */
2793
2794         outb(quot & 0xff, info->base + UART_DLL);       /* LS of divisor */
2795         outb(quot >> 8, info->base + UART_DLM); /* MS of divisor */
2796         outb(cval, info->base + UART_LCR);      /* reset DLAB */
2797
2798
2799         return ret;
2800 }
2801
2802 /*
2803  * ------------------------------------------------------------
2804  * friends of mxser_ioctl()
2805  * ------------------------------------------------------------
2806  */
2807 static int mxser_get_serial_info(struct mxser_struct *info, struct serial_struct __user *retinfo)
2808 {
2809         struct serial_struct tmp;
2810
2811         if (!retinfo)
2812                 return -EFAULT;
2813         memset(&tmp, 0, sizeof(tmp));
2814         tmp.type = info->type;
2815         tmp.line = info->port;
2816         tmp.port = info->base;
2817         tmp.irq = info->irq;
2818         tmp.flags = info->flags;
2819         tmp.baud_base = info->baud_base;
2820         tmp.close_delay = info->close_delay;
2821         tmp.closing_wait = info->closing_wait;
2822         tmp.custom_divisor = info->custom_divisor;
2823         tmp.hub6 = 0;
2824         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2825                 return -EFAULT;
2826         return 0;
2827 }
2828
2829 static int mxser_set_serial_info(struct mxser_struct *info, struct serial_struct __user *new_info)
2830 {
2831         struct serial_struct new_serial;
2832         unsigned int flags;
2833         int retval = 0;
2834
2835         if (!new_info || !info->base)
2836                 return -EFAULT;
2837         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2838                 return -EFAULT;
2839
2840         if ((new_serial.irq != info->irq) ||
2841                         (new_serial.port != info->base) ||
2842                         (new_serial.custom_divisor != info->custom_divisor) ||
2843                         (new_serial.baud_base != info->baud_base))
2844                 return -EPERM;
2845
2846         flags = info->flags & ASYNC_SPD_MASK;
2847
2848         if (!capable(CAP_SYS_ADMIN)) {
2849                 if ((new_serial.baud_base != info->baud_base) ||
2850                                 (new_serial.close_delay != info->close_delay) ||
2851                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK)))
2852                         return -EPERM;
2853                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
2854                                 (new_serial.flags & ASYNC_USR_MASK));
2855         } else {
2856                 /*
2857                  * OK, past this point, all the error checking has been done.
2858                  * At this point, we start making changes.....
2859                  */
2860                 info->flags = ((info->flags & ~ASYNC_FLAGS) |
2861                                 (new_serial.flags & ASYNC_FLAGS));
2862                 info->close_delay = new_serial.close_delay * HZ / 100;
2863                 info->closing_wait = new_serial.closing_wait * HZ / 100;
2864                 info->tty->low_latency =
2865                                 (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2866                 info->tty->low_latency = 0;     /* (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; */
2867         }
2868
2869         /* added by casper, 3/17/2000, for mouse */
2870         info->type = new_serial.type;
2871
2872         process_txrx_fifo(info);
2873
2874         if (info->flags & ASYNC_INITIALIZED) {
2875                 if (flags != (info->flags & ASYNC_SPD_MASK)) {
2876                         mxser_change_speed(info, NULL);
2877                 }
2878         } else {
2879                 retval = mxser_startup(info);
2880         }
2881         return retval;
2882 }
2883
2884 /*
2885  * mxser_get_lsr_info - get line status register info
2886  *
2887  * Purpose: Let user call ioctl() to get info when the UART physically
2888  *          is emptied.  On bus types like RS485, the transmitter must
2889  *          release the bus after transmitting. This must be done when
2890  *          the transmit shift register is empty, not be done when the
2891  *          transmit holding register is empty.  This functionality
2892  *          allows an RS485 driver to be written in user space.
2893  */
2894 static int mxser_get_lsr_info(struct mxser_struct *info, unsigned int __user *value)
2895 {
2896         unsigned char status;
2897         unsigned int result;
2898         unsigned long flags;
2899
2900         spin_lock_irqsave(&info->slock, flags);
2901         status = inb(info->base + UART_LSR);
2902         spin_unlock_irqrestore(&info->slock, flags);
2903         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
2904         return put_user(result, value);
2905 }
2906
2907 /*
2908  * This routine sends a break character out the serial port.
2909  */
2910 static void mxser_send_break(struct mxser_struct *info, int duration)
2911 {
2912         unsigned long flags;
2913
2914         if (!info->base)
2915                 return;
2916         set_current_state(TASK_INTERRUPTIBLE);
2917         spin_lock_irqsave(&info->slock, flags);
2918         outb(inb(info->base + UART_LCR) | UART_LCR_SBC,
2919                 info->base + UART_LCR);
2920         spin_unlock_irqrestore(&info->slock, flags);
2921         schedule_timeout(duration);
2922         spin_lock_irqsave(&info->slock, flags);
2923         outb(inb(info->base + UART_LCR) & ~UART_LCR_SBC,
2924                 info->base + UART_LCR);
2925         spin_unlock_irqrestore(&info->slock, flags);
2926 }
2927
2928 static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
2929 {
2930         struct mxser_struct *info = tty->driver_data;
2931         unsigned char control, status;
2932         unsigned long flags;
2933
2934
2935         if (tty->index == MXSER_PORTS)
2936                 return -ENOIOCTLCMD;
2937         if (tty->flags & (1 << TTY_IO_ERROR))
2938                 return -EIO;
2939
2940         control = info->MCR;
2941
2942         spin_lock_irqsave(&info->slock, flags);
2943         status = inb(info->base + UART_MSR);
2944         if (status & UART_MSR_ANY_DELTA)
2945                 mxser_check_modem_status(info, status);
2946         spin_unlock_irqrestore(&info->slock, flags);
2947         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
2948                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
2949                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
2950                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
2951                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
2952                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
2953 }
2954
2955 static int mxser_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear)
2956 {
2957         struct mxser_struct *info = tty->driver_data;
2958         unsigned long flags;
2959
2960
2961         if (tty->index == MXSER_PORTS)
2962                 return -ENOIOCTLCMD;
2963         if (tty->flags & (1 << TTY_IO_ERROR))
2964                 return -EIO;
2965
2966         spin_lock_irqsave(&info->slock, flags);
2967
2968         if (set & TIOCM_RTS)
2969                 info->MCR |= UART_MCR_RTS;
2970         if (set & TIOCM_DTR)
2971                 info->MCR |= UART_MCR_DTR;
2972
2973         if (clear & TIOCM_RTS)
2974                 info->MCR &= ~UART_MCR_RTS;
2975         if (clear & TIOCM_DTR)
2976                 info->MCR &= ~UART_MCR_DTR;
2977
2978         outb(info->MCR, info->base + UART_MCR);
2979         spin_unlock_irqrestore(&info->slock, flags);
2980         return 0;
2981 }
2982
2983
2984 static int mxser_read_register(int, unsigned short *);
2985 static int mxser_program_mode(int);
2986 static void mxser_normal_mode(int);
2987
2988 static int mxser_get_ISA_conf(int cap, struct mxser_hwconf *hwconf)
2989 {
2990         int id, i, bits;
2991         unsigned short regs[16], irq;
2992         unsigned char scratch, scratch2;
2993
2994         hwconf->IsMoxaMustChipFlag = MOXA_OTHER_UART;
2995
2996         id = mxser_read_register(cap, regs);
2997         if (id == C168_ASIC_ID) {
2998                 hwconf->board_type = MXSER_BOARD_C168_ISA;
2999                 hwconf->ports = 8;
3000         } else if (id == C104_ASIC_ID) {
3001                 hwconf->board_type = MXSER_BOARD_C104_ISA;
3002                 hwconf->ports = 4;
3003         } else if (id == C102_ASIC_ID) {
3004                 hwconf->board_type = MXSER_BOARD_C102_ISA;
3005                 hwconf->ports = 2;
3006         } else if (id == CI132_ASIC_ID) {
3007                 hwconf->board_type = MXSER_BOARD_CI132;
3008                 hwconf->ports = 2;
3009         } else if (id == CI134_ASIC_ID) {
3010                 hwconf->board_type = MXSER_BOARD_CI134;
3011                 hwconf->ports = 4;
3012         } else if (id == CI104J_ASIC_ID) {
3013                 hwconf->board_type = MXSER_BOARD_CI104J;
3014                 hwconf->ports = 4;
3015         } else
3016                 return 0;
3017
3018         irq = 0;
3019         if (hwconf->ports == 2) {
3020                 irq = regs[9] & 0xF000;
3021                 irq = irq | (irq >> 4);
3022                 if (irq != (regs[9] & 0xFF00))
3023                         return MXSER_ERR_IRQ_CONFLIT;
3024         } else if (hwconf->ports == 4) {
3025                 irq = regs[9] & 0xF000;
3026                 irq = irq | (irq >> 4);
3027                 irq = irq | (irq >> 8);
3028                 if (irq != regs[9])
3029                         return MXSER_ERR_IRQ_CONFLIT;
3030         } else if (hwconf->ports == 8) {
3031                 irq = regs[9] & 0xF000;
3032                 irq = irq | (irq >> 4);
3033                 irq = irq | (irq >> 8);
3034                 if ((irq != regs[9]) || (irq != regs[10]))
3035                         return MXSER_ERR_IRQ_CONFLIT;
3036         }
3037
3038         if (!irq)
3039                 return MXSER_ERR_IRQ;
3040         hwconf->irq = ((int)(irq & 0xF000) >> 12);
3041         for (i = 0; i < 8; i++)
3042                 hwconf->ioaddr[i] = (int) regs[i + 1] & 0xFFF8;
3043         if ((regs[12] & 0x80) == 0)
3044                 return MXSER_ERR_VECTOR;
3045         hwconf->vector = (int)regs[11]; /* interrupt vector */
3046         if (id == 1)
3047                 hwconf->vector_mask = 0x00FF;
3048         else
3049                 hwconf->vector_mask = 0x000F;
3050         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
3051                 if (regs[12] & bits) {
3052                         hwconf->baud_base[i] = 921600;
3053                         hwconf->MaxCanSetBaudRate[i] = 921600;  /* add by Victor Yu. 09-04-2002 */
3054                 } else {
3055                         hwconf->baud_base[i] = 115200;
3056                         hwconf->MaxCanSetBaudRate[i] = 115200;  /* add by Victor Yu. 09-04-2002 */
3057                 }
3058         }
3059         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
3060         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
3061         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
3062         outb(scratch2, cap + UART_LCR);
3063         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
3064         scratch = inb(cap + UART_IIR);
3065
3066         if (scratch & 0xC0)
3067                 hwconf->uart_type = PORT_16550A;
3068         else
3069                 hwconf->uart_type = PORT_16450;
3070         if (id == 1)
3071                 hwconf->ports = 8;
3072         else
3073                 hwconf->ports = 4;
3074         request_region(hwconf->ioaddr[0], 8 * hwconf->ports, "mxser(IO)");
3075         request_region(hwconf->vector, 1, "mxser(vector)");
3076         return hwconf->ports;
3077 }
3078
3079 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
3080 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
3081 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
3082 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
3083 #define EN_CCMD         0x000   /* Chip's command register     */
3084 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
3085 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
3086 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
3087 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
3088 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
3089 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
3090 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
3091 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
3092 static int mxser_read_register(int port, unsigned short *regs)
3093 {
3094         int i, k, value, id;
3095         unsigned int j;
3096
3097         id = mxser_program_mode(port);
3098         if (id < 0)
3099                 return id;
3100         for (i = 0; i < 14; i++) {
3101                 k = (i & 0x3F) | 0x180;
3102                 for (j = 0x100; j > 0; j >>= 1) {
3103                         outb(CHIP_CS, port);
3104                         if (k & j) {
3105                                 outb(CHIP_CS | CHIP_DO, port);
3106                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
3107                         } else {
3108                                 outb(CHIP_CS, port);
3109                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
3110                         }
3111                 }
3112                 (void)inb(port);
3113                 value = 0;
3114                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
3115                         outb(CHIP_CS, port);
3116                         outb(CHIP_CS | CHIP_SK, port);
3117                         if (inb(port) & CHIP_DI)
3118                                 value |= j;
3119                 }
3120                 regs[i] = value;
3121                 outb(0, port);
3122         }
3123         mxser_normal_mode(port);
3124         return id;
3125 }
3126
3127 static int mxser_program_mode(int port)
3128 {
3129         int id, i, j, n;
3130         /* unsigned long flags; */
3131
3132         spin_lock(&gm_lock);
3133         outb(0, port);
3134         outb(0, port);
3135         outb(0, port);
3136         (void)inb(port);
3137         (void)inb(port);
3138         outb(0, port);
3139         (void)inb(port);
3140         /* restore_flags(flags); */
3141         spin_unlock(&gm_lock);
3142
3143         id = inb(port + 1) & 0x1F;
3144         if ((id != C168_ASIC_ID) &&
3145                         (id != C104_ASIC_ID) &&
3146                         (id != C102_ASIC_ID) &&
3147                         (id != CI132_ASIC_ID) &&
3148                         (id != CI134_ASIC_ID) &&
3149                         (id != CI104J_ASIC_ID))
3150                 return -1;
3151         for (i = 0, j = 0; i < 4; i++) {
3152                 n = inb(port + 2);
3153                 if (n == 'M') {
3154                         j = 1;
3155                 } else if ((j == 1) && (n == 1)) {
3156                         j = 2;
3157                         break;
3158                 } else
3159                         j = 0;
3160         }
3161         if (j != 2)
3162                 id = -2;
3163         return id;
3164 }
3165
3166 static void mxser_normal_mode(int port)
3167 {
3168         int i, n;
3169
3170         outb(0xA5, port + 1);
3171         outb(0x80, port + 3);
3172         outb(12, port + 0);     /* 9600 bps */
3173         outb(0, port + 1);
3174         outb(0x03, port + 3);   /* 8 data bits */
3175         outb(0x13, port + 4);   /* loop back mode */
3176         for (i = 0; i < 16; i++) {
3177                 n = inb(port + 5);
3178                 if ((n & 0x61) == 0x60)
3179                         break;
3180                 if ((n & 1) == 1)
3181                         (void)inb(port);
3182         }
3183         outb(0x00, port + 4);
3184 }
3185
3186 module_init(mxser_module_init);
3187 module_exit(mxser_module_exit);