linux/drivers/tty/moxa.c
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   1/*****************************************************************************/
   2/*
   3 *           moxa.c  -- MOXA Intellio family multiport serial driver.
   4 *
   5 *      Copyright (C) 1999-2000  Moxa Technologies (support@moxa.com).
   6 *      Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
   7 *
   8 *      This code is loosely based on the Linux serial driver, written by
   9 *      Linus Torvalds, Theodore T'so and others.
  10 *
  11 *      This program is free software; you can redistribute it and/or modify
  12 *      it under the terms of the GNU General Public License as published by
  13 *      the Free Software Foundation; either version 2 of the License, or
  14 *      (at your option) any later version.
  15 */
  16
  17/*
  18 *    MOXA Intellio Series Driver
  19 *      for             : LINUX
  20 *      date            : 1999/1/7
  21 *      version         : 5.1
  22 */
  23
  24#include <linux/module.h>
  25#include <linux/types.h>
  26#include <linux/mm.h>
  27#include <linux/ioport.h>
  28#include <linux/errno.h>
  29#include <linux/firmware.h>
  30#include <linux/signal.h>
  31#include <linux/sched.h>
  32#include <linux/timer.h>
  33#include <linux/interrupt.h>
  34#include <linux/tty.h>
  35#include <linux/tty_flip.h>
  36#include <linux/major.h>
  37#include <linux/string.h>
  38#include <linux/fcntl.h>
  39#include <linux/ptrace.h>
  40#include <linux/serial.h>
  41#include <linux/tty_driver.h>
  42#include <linux/delay.h>
  43#include <linux/pci.h>
  44#include <linux/init.h>
  45#include <linux/bitops.h>
  46#include <linux/slab.h>
  47#include <linux/ratelimit.h>
  48
  49#include <asm/io.h>
  50#include <asm/uaccess.h>
  51
  52#include "moxa.h"
  53
  54#define MOXA_VERSION            "6.0k"
  55
  56#define MOXA_FW_HDRLEN          32
  57
  58#define MOXAMAJOR               172
  59
  60#define MAX_BOARDS              4       /* Don't change this value */
  61#define MAX_PORTS_PER_BOARD     32      /* Don't change this value */
  62#define MAX_PORTS               (MAX_BOARDS * MAX_PORTS_PER_BOARD)
  63
  64#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
  65                (brd)->boardType == MOXA_BOARD_C320_PCI)
  66
  67/*
  68 *    Define the Moxa PCI vendor and device IDs.
  69 */
  70#define MOXA_BUS_TYPE_ISA       0
  71#define MOXA_BUS_TYPE_PCI       1
  72
  73enum {
  74        MOXA_BOARD_C218_PCI = 1,
  75        MOXA_BOARD_C218_ISA,
  76        MOXA_BOARD_C320_PCI,
  77        MOXA_BOARD_C320_ISA,
  78        MOXA_BOARD_CP204J,
  79};
  80
  81static char *moxa_brdname[] =
  82{
  83        "C218 Turbo PCI series",
  84        "C218 Turbo ISA series",
  85        "C320 Turbo PCI series",
  86        "C320 Turbo ISA series",
  87        "CP-204J series",
  88};
  89
  90#ifdef CONFIG_PCI
  91static struct pci_device_id moxa_pcibrds[] = {
  92        { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
  93                .driver_data = MOXA_BOARD_C218_PCI },
  94        { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
  95                .driver_data = MOXA_BOARD_C320_PCI },
  96        { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
  97                .driver_data = MOXA_BOARD_CP204J },
  98        { 0 }
  99};
 100MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
 101#endif /* CONFIG_PCI */
 102
 103struct moxa_port;
 104
 105static struct moxa_board_conf {
 106        int boardType;
 107        int numPorts;
 108        int busType;
 109
 110        unsigned int ready;
 111
 112        struct moxa_port *ports;
 113
 114        void __iomem *basemem;
 115        void __iomem *intNdx;
 116        void __iomem *intPend;
 117        void __iomem *intTable;
 118} moxa_boards[MAX_BOARDS];
 119
 120struct mxser_mstatus {
 121        tcflag_t cflag;
 122        int cts;
 123        int dsr;
 124        int ri;
 125        int dcd;
 126};
 127
 128struct moxaq_str {
 129        int inq;
 130        int outq;
 131};
 132
 133struct moxa_port {
 134        struct tty_port port;
 135        struct moxa_board_conf *board;
 136        void __iomem *tableAddr;
 137
 138        int type;
 139        int cflag;
 140        unsigned long statusflags;
 141
 142        u8 DCDState;            /* Protected by the port lock */
 143        u8 lineCtrl;
 144        u8 lowChkFlag;
 145};
 146
 147struct mon_str {
 148        int tick;
 149        int rxcnt[MAX_PORTS];
 150        int txcnt[MAX_PORTS];
 151};
 152
 153/* statusflags */
 154#define TXSTOPPED       1
 155#define LOWWAIT         2
 156#define EMPTYWAIT       3
 157
 158#define SERIAL_DO_RESTART
 159
 160#define WAKEUP_CHARS            256
 161
 162static int ttymajor = MOXAMAJOR;
 163static struct mon_str moxaLog;
 164static unsigned int moxaFuncTout = HZ / 2;
 165static unsigned int moxaLowWaterChk;
 166static DEFINE_MUTEX(moxa_openlock);
 167static DEFINE_SPINLOCK(moxa_lock);
 168
 169static unsigned long baseaddr[MAX_BOARDS];
 170static unsigned int type[MAX_BOARDS];
 171static unsigned int numports[MAX_BOARDS];
 172static struct tty_port moxa_service_port;
 173
 174MODULE_AUTHOR("William Chen");
 175MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
 176MODULE_LICENSE("GPL");
 177MODULE_FIRMWARE("c218tunx.cod");
 178MODULE_FIRMWARE("cp204unx.cod");
 179MODULE_FIRMWARE("c320tunx.cod");
 180
 181module_param_array(type, uint, NULL, 0);
 182MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
 183module_param_array(baseaddr, ulong, NULL, 0);
 184MODULE_PARM_DESC(baseaddr, "base address");
 185module_param_array(numports, uint, NULL, 0);
 186MODULE_PARM_DESC(numports, "numports (ignored for C218)");
 187
 188module_param(ttymajor, int, 0);
 189
 190/*
 191 * static functions:
 192 */
 193static int moxa_open(struct tty_struct *, struct file *);
 194static void moxa_close(struct tty_struct *, struct file *);
 195static int moxa_write(struct tty_struct *, const unsigned char *, int);
 196static int moxa_write_room(struct tty_struct *);
 197static void moxa_flush_buffer(struct tty_struct *);
 198static int moxa_chars_in_buffer(struct tty_struct *);
 199static void moxa_set_termios(struct tty_struct *, struct ktermios *);
 200static void moxa_stop(struct tty_struct *);
 201static void moxa_start(struct tty_struct *);
 202static void moxa_hangup(struct tty_struct *);
 203static int moxa_tiocmget(struct tty_struct *tty);
 204static int moxa_tiocmset(struct tty_struct *tty,
 205                         unsigned int set, unsigned int clear);
 206static void moxa_poll(unsigned long);
 207static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
 208static void moxa_shutdown(struct tty_port *);
 209static int moxa_carrier_raised(struct tty_port *);
 210static void moxa_dtr_rts(struct tty_port *, int);
 211/*
 212 * moxa board interface functions:
 213 */
 214static void MoxaPortEnable(struct moxa_port *);
 215static void MoxaPortDisable(struct moxa_port *);
 216static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
 217static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
 218static void MoxaPortLineCtrl(struct moxa_port *, int, int);
 219static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
 220static int MoxaPortLineStatus(struct moxa_port *);
 221static void MoxaPortFlushData(struct moxa_port *, int);
 222static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
 223static int MoxaPortReadData(struct moxa_port *);
 224static int MoxaPortTxQueue(struct moxa_port *);
 225static int MoxaPortRxQueue(struct moxa_port *);
 226static int MoxaPortTxFree(struct moxa_port *);
 227static void MoxaPortTxDisable(struct moxa_port *);
 228static void MoxaPortTxEnable(struct moxa_port *);
 229static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
 230static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
 231static void MoxaSetFifo(struct moxa_port *port, int enable);
 232
 233/*
 234 * I/O functions
 235 */
 236
 237static DEFINE_SPINLOCK(moxafunc_lock);
 238
 239static void moxa_wait_finish(void __iomem *ofsAddr)
 240{
 241        unsigned long end = jiffies + moxaFuncTout;
 242
 243        while (readw(ofsAddr + FuncCode) != 0)
 244                if (time_after(jiffies, end))
 245                        return;
 246        if (readw(ofsAddr + FuncCode) != 0)
 247                printk_ratelimited(KERN_WARNING "moxa function expired\n");
 248}
 249
 250static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
 251{
 252        unsigned long flags;
 253        spin_lock_irqsave(&moxafunc_lock, flags);
 254        writew(arg, ofsAddr + FuncArg);
 255        writew(cmd, ofsAddr + FuncCode);
 256        moxa_wait_finish(ofsAddr);
 257        spin_unlock_irqrestore(&moxafunc_lock, flags);
 258}
 259
 260static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
 261{
 262        unsigned long flags;
 263        u16 ret;
 264        spin_lock_irqsave(&moxafunc_lock, flags);
 265        writew(arg, ofsAddr + FuncArg);
 266        writew(cmd, ofsAddr + FuncCode);
 267        moxa_wait_finish(ofsAddr);
 268        ret = readw(ofsAddr + FuncArg);
 269        spin_unlock_irqrestore(&moxafunc_lock, flags);
 270        return ret;
 271}
 272
 273static void moxa_low_water_check(void __iomem *ofsAddr)
 274{
 275        u16 rptr, wptr, mask, len;
 276
 277        if (readb(ofsAddr + FlagStat) & Xoff_state) {
 278                rptr = readw(ofsAddr + RXrptr);
 279                wptr = readw(ofsAddr + RXwptr);
 280                mask = readw(ofsAddr + RX_mask);
 281                len = (wptr - rptr) & mask;
 282                if (len <= Low_water)
 283                        moxafunc(ofsAddr, FC_SendXon, 0);
 284        }
 285}
 286
 287/*
 288 * TTY operations
 289 */
 290
 291static int moxa_ioctl(struct tty_struct *tty,
 292                      unsigned int cmd, unsigned long arg)
 293{
 294        struct moxa_port *ch = tty->driver_data;
 295        void __user *argp = (void __user *)arg;
 296        int status, ret = 0;
 297
 298        if (tty->index == MAX_PORTS) {
 299                if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
 300                                cmd != MOXA_GETMSTATUS)
 301                        return -EINVAL;
 302        } else if (!ch)
 303                return -ENODEV;
 304
 305        switch (cmd) {
 306        case MOXA_GETDATACOUNT:
 307                moxaLog.tick = jiffies;
 308                if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
 309                        ret = -EFAULT;
 310                break;
 311        case MOXA_FLUSH_QUEUE:
 312                MoxaPortFlushData(ch, arg);
 313                break;
 314        case MOXA_GET_IOQUEUE: {
 315                struct moxaq_str __user *argm = argp;
 316                struct moxaq_str tmp;
 317                struct moxa_port *p;
 318                unsigned int i, j;
 319
 320                for (i = 0; i < MAX_BOARDS; i++) {
 321                        p = moxa_boards[i].ports;
 322                        for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
 323                                memset(&tmp, 0, sizeof(tmp));
 324                                spin_lock_bh(&moxa_lock);
 325                                if (moxa_boards[i].ready) {
 326                                        tmp.inq = MoxaPortRxQueue(p);
 327                                        tmp.outq = MoxaPortTxQueue(p);
 328                                }
 329                                spin_unlock_bh(&moxa_lock);
 330                                if (copy_to_user(argm, &tmp, sizeof(tmp)))
 331                                        return -EFAULT;
 332                        }
 333                }
 334                break;
 335        } case MOXA_GET_OQUEUE:
 336                status = MoxaPortTxQueue(ch);
 337                ret = put_user(status, (unsigned long __user *)argp);
 338                break;
 339        case MOXA_GET_IQUEUE:
 340                status = MoxaPortRxQueue(ch);
 341                ret = put_user(status, (unsigned long __user *)argp);
 342                break;
 343        case MOXA_GETMSTATUS: {
 344                struct mxser_mstatus __user *argm = argp;
 345                struct mxser_mstatus tmp;
 346                struct moxa_port *p;
 347                unsigned int i, j;
 348
 349                for (i = 0; i < MAX_BOARDS; i++) {
 350                        p = moxa_boards[i].ports;
 351                        for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
 352                                struct tty_struct *ttyp;
 353                                memset(&tmp, 0, sizeof(tmp));
 354                                spin_lock_bh(&moxa_lock);
 355                                if (!moxa_boards[i].ready) {
 356                                        spin_unlock_bh(&moxa_lock);
 357                                        goto copy;
 358                                }
 359
 360                                status = MoxaPortLineStatus(p);
 361                                spin_unlock_bh(&moxa_lock);
 362
 363                                if (status & 1)
 364                                        tmp.cts = 1;
 365                                if (status & 2)
 366                                        tmp.dsr = 1;
 367                                if (status & 4)
 368                                        tmp.dcd = 1;
 369
 370                                ttyp = tty_port_tty_get(&p->port);
 371                                if (!ttyp)
 372                                        tmp.cflag = p->cflag;
 373                                else
 374                                        tmp.cflag = ttyp->termios.c_cflag;
 375                                tty_kref_put(ttyp);
 376copy:
 377                                if (copy_to_user(argm, &tmp, sizeof(tmp)))
 378                                        return -EFAULT;
 379                        }
 380                }
 381                break;
 382        }
 383        case TIOCGSERIAL:
 384                mutex_lock(&ch->port.mutex);
 385                ret = moxa_get_serial_info(ch, argp);
 386                mutex_unlock(&ch->port.mutex);
 387                break;
 388        case TIOCSSERIAL:
 389                mutex_lock(&ch->port.mutex);
 390                ret = moxa_set_serial_info(ch, argp);
 391                mutex_unlock(&ch->port.mutex);
 392                break;
 393        default:
 394                ret = -ENOIOCTLCMD;
 395        }
 396        return ret;
 397}
 398
 399static int moxa_break_ctl(struct tty_struct *tty, int state)
 400{
 401        struct moxa_port *port = tty->driver_data;
 402
 403        moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
 404                        Magic_code);
 405        return 0;
 406}
 407
 408static const struct tty_operations moxa_ops = {
 409        .open = moxa_open,
 410        .close = moxa_close,
 411        .write = moxa_write,
 412        .write_room = moxa_write_room,
 413        .flush_buffer = moxa_flush_buffer,
 414        .chars_in_buffer = moxa_chars_in_buffer,
 415        .ioctl = moxa_ioctl,
 416        .set_termios = moxa_set_termios,
 417        .stop = moxa_stop,
 418        .start = moxa_start,
 419        .hangup = moxa_hangup,
 420        .break_ctl = moxa_break_ctl,
 421        .tiocmget = moxa_tiocmget,
 422        .tiocmset = moxa_tiocmset,
 423};
 424
 425static const struct tty_port_operations moxa_port_ops = {
 426        .carrier_raised = moxa_carrier_raised,
 427        .dtr_rts = moxa_dtr_rts,
 428        .shutdown = moxa_shutdown,
 429};
 430
 431static struct tty_driver *moxaDriver;
 432static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
 433
 434/*
 435 * HW init
 436 */
 437
 438static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
 439{
 440        switch (brd->boardType) {
 441        case MOXA_BOARD_C218_ISA:
 442        case MOXA_BOARD_C218_PCI:
 443                if (model != 1)
 444                        goto err;
 445                break;
 446        case MOXA_BOARD_CP204J:
 447                if (model != 3)
 448                        goto err;
 449                break;
 450        default:
 451                if (model != 2)
 452                        goto err;
 453                break;
 454        }
 455        return 0;
 456err:
 457        return -EINVAL;
 458}
 459
 460static int moxa_check_fw(const void *ptr)
 461{
 462        const __le16 *lptr = ptr;
 463
 464        if (*lptr != cpu_to_le16(0x7980))
 465                return -EINVAL;
 466
 467        return 0;
 468}
 469
 470static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
 471                size_t len)
 472{
 473        void __iomem *baseAddr = brd->basemem;
 474        u16 tmp;
 475
 476        writeb(HW_reset, baseAddr + Control_reg);       /* reset */
 477        msleep(10);
 478        memset_io(baseAddr, 0, 4096);
 479        memcpy_toio(baseAddr, buf, len);        /* download BIOS */
 480        writeb(0, baseAddr + Control_reg);      /* restart */
 481
 482        msleep(2000);
 483
 484        switch (brd->boardType) {
 485        case MOXA_BOARD_C218_ISA:
 486        case MOXA_BOARD_C218_PCI:
 487                tmp = readw(baseAddr + C218_key);
 488                if (tmp != C218_KeyCode)
 489                        goto err;
 490                break;
 491        case MOXA_BOARD_CP204J:
 492                tmp = readw(baseAddr + C218_key);
 493                if (tmp != CP204J_KeyCode)
 494                        goto err;
 495                break;
 496        default:
 497                tmp = readw(baseAddr + C320_key);
 498                if (tmp != C320_KeyCode)
 499                        goto err;
 500                tmp = readw(baseAddr + C320_status);
 501                if (tmp != STS_init) {
 502                        printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
 503                                        "module not found\n");
 504                        return -EIO;
 505                }
 506                break;
 507        }
 508
 509        return 0;
 510err:
 511        printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
 512        return -EIO;
 513}
 514
 515static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
 516                size_t len)
 517{
 518        void __iomem *baseAddr = brd->basemem;
 519
 520        if (len < 7168) {
 521                printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
 522                return -EINVAL;
 523        }
 524
 525        writew(len - 7168 - 2, baseAddr + C320bapi_len);
 526        writeb(1, baseAddr + Control_reg);      /* Select Page 1 */
 527        memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
 528        writeb(2, baseAddr + Control_reg);      /* Select Page 2 */
 529        memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
 530
 531        return 0;
 532}
 533
 534static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
 535                size_t len)
 536{
 537        void __iomem *baseAddr = brd->basemem;
 538        const __le16 *uptr = ptr;
 539        size_t wlen, len2, j;
 540        unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
 541        unsigned int i, retry;
 542        u16 usum, keycode;
 543
 544        keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
 545                                C218_KeyCode;
 546
 547        switch (brd->boardType) {
 548        case MOXA_BOARD_CP204J:
 549        case MOXA_BOARD_C218_ISA:
 550        case MOXA_BOARD_C218_PCI:
 551                key = C218_key;
 552                loadbuf = C218_LoadBuf;
 553                loadlen = C218DLoad_len;
 554                checksum = C218check_sum;
 555                checksum_ok = C218chksum_ok;
 556                break;
 557        default:
 558                key = C320_key;
 559                keycode = C320_KeyCode;
 560                loadbuf = C320_LoadBuf;
 561                loadlen = C320DLoad_len;
 562                checksum = C320check_sum;
 563                checksum_ok = C320chksum_ok;
 564                break;
 565        }
 566
 567        usum = 0;
 568        wlen = len >> 1;
 569        for (i = 0; i < wlen; i++)
 570                usum += le16_to_cpu(uptr[i]);
 571        retry = 0;
 572        do {
 573                wlen = len >> 1;
 574                j = 0;
 575                while (wlen) {
 576                        len2 = (wlen > 2048) ? 2048 : wlen;
 577                        wlen -= len2;
 578                        memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
 579                        j += len2 << 1;
 580
 581                        writew(len2, baseAddr + loadlen);
 582                        writew(0, baseAddr + key);
 583                        for (i = 0; i < 100; i++) {
 584                                if (readw(baseAddr + key) == keycode)
 585                                        break;
 586                                msleep(10);
 587                        }
 588                        if (readw(baseAddr + key) != keycode)
 589                                return -EIO;
 590                }
 591                writew(0, baseAddr + loadlen);
 592                writew(usum, baseAddr + checksum);
 593                writew(0, baseAddr + key);
 594                for (i = 0; i < 100; i++) {
 595                        if (readw(baseAddr + key) == keycode)
 596                                break;
 597                        msleep(10);
 598                }
 599                retry++;
 600        } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
 601        if (readb(baseAddr + checksum_ok) != 1)
 602                return -EIO;
 603
 604        writew(0, baseAddr + key);
 605        for (i = 0; i < 600; i++) {
 606                if (readw(baseAddr + Magic_no) == Magic_code)
 607                        break;
 608                msleep(10);
 609        }
 610        if (readw(baseAddr + Magic_no) != Magic_code)
 611                return -EIO;
 612
 613        if (MOXA_IS_320(brd)) {
 614                if (brd->busType == MOXA_BUS_TYPE_PCI) {        /* ASIC board */
 615                        writew(0x3800, baseAddr + TMS320_PORT1);
 616                        writew(0x3900, baseAddr + TMS320_PORT2);
 617                        writew(28499, baseAddr + TMS320_CLOCK);
 618                } else {
 619                        writew(0x3200, baseAddr + TMS320_PORT1);
 620                        writew(0x3400, baseAddr + TMS320_PORT2);
 621                        writew(19999, baseAddr + TMS320_CLOCK);
 622                }
 623        }
 624        writew(1, baseAddr + Disable_IRQ);
 625        writew(0, baseAddr + Magic_no);
 626        for (i = 0; i < 500; i++) {
 627                if (readw(baseAddr + Magic_no) == Magic_code)
 628                        break;
 629                msleep(10);
 630        }
 631        if (readw(baseAddr + Magic_no) != Magic_code)
 632                return -EIO;
 633
 634        if (MOXA_IS_320(brd)) {
 635                j = readw(baseAddr + Module_cnt);
 636                if (j <= 0)
 637                        return -EIO;
 638                brd->numPorts = j * 8;
 639                writew(j, baseAddr + Module_no);
 640                writew(0, baseAddr + Magic_no);
 641                for (i = 0; i < 600; i++) {
 642                        if (readw(baseAddr + Magic_no) == Magic_code)
 643                                break;
 644                        msleep(10);
 645                }
 646                if (readw(baseAddr + Magic_no) != Magic_code)
 647                        return -EIO;
 648        }
 649        brd->intNdx = baseAddr + IRQindex;
 650        brd->intPend = baseAddr + IRQpending;
 651        brd->intTable = baseAddr + IRQtable;
 652
 653        return 0;
 654}
 655
 656static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
 657                size_t len)
 658{
 659        void __iomem *ofsAddr, *baseAddr = brd->basemem;
 660        struct moxa_port *port;
 661        int retval, i;
 662
 663        if (len % 2) {
 664                printk(KERN_ERR "MOXA: bios length is not even\n");
 665                return -EINVAL;
 666        }
 667
 668        retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
 669        if (retval)
 670                return retval;
 671
 672        switch (brd->boardType) {
 673        case MOXA_BOARD_C218_ISA:
 674        case MOXA_BOARD_C218_PCI:
 675        case MOXA_BOARD_CP204J:
 676                port = brd->ports;
 677                for (i = 0; i < brd->numPorts; i++, port++) {
 678                        port->board = brd;
 679                        port->DCDState = 0;
 680                        port->tableAddr = baseAddr + Extern_table +
 681                                        Extern_size * i;
 682                        ofsAddr = port->tableAddr;
 683                        writew(C218rx_mask, ofsAddr + RX_mask);
 684                        writew(C218tx_mask, ofsAddr + TX_mask);
 685                        writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
 686                        writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
 687
 688                        writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
 689                        writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
 690
 691                }
 692                break;
 693        default:
 694                port = brd->ports;
 695                for (i = 0; i < brd->numPorts; i++, port++) {
 696                        port->board = brd;
 697                        port->DCDState = 0;
 698                        port->tableAddr = baseAddr + Extern_table +
 699                                        Extern_size * i;
 700                        ofsAddr = port->tableAddr;
 701                        switch (brd->numPorts) {
 702                        case 8:
 703                                writew(C320p8rx_mask, ofsAddr + RX_mask);
 704                                writew(C320p8tx_mask, ofsAddr + TX_mask);
 705                                writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
 706                                writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
 707                                writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
 708                                writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
 709
 710                                break;
 711                        case 16:
 712                                writew(C320p16rx_mask, ofsAddr + RX_mask);
 713                                writew(C320p16tx_mask, ofsAddr + TX_mask);
 714                                writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
 715                                writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
 716                                writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
 717                                writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
 718                                break;
 719
 720                        case 24:
 721                                writew(C320p24rx_mask, ofsAddr + RX_mask);
 722                                writew(C320p24tx_mask, ofsAddr + TX_mask);
 723                                writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
 724                                writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
 725                                writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
 726                                writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
 727                                break;
 728                        case 32:
 729                                writew(C320p32rx_mask, ofsAddr + RX_mask);
 730                                writew(C320p32tx_mask, ofsAddr + TX_mask);
 731                                writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
 732                                writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
 733                                writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
 734                                writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
 735                                writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
 736                                break;
 737                        }
 738                }
 739                break;
 740        }
 741        return 0;
 742}
 743
 744static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
 745{
 746        const void *ptr = fw->data;
 747        char rsn[64];
 748        u16 lens[5];
 749        size_t len;
 750        unsigned int a, lenp, lencnt;
 751        int ret = -EINVAL;
 752        struct {
 753                __le32 magic;   /* 0x34303430 */
 754                u8 reserved1[2];
 755                u8 type;        /* UNIX = 3 */
 756                u8 model;       /* C218T=1, C320T=2, CP204=3 */
 757                u8 reserved2[8];
 758                __le16 len[5];
 759        } const *hdr = ptr;
 760
 761        BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
 762
 763        if (fw->size < MOXA_FW_HDRLEN) {
 764                strcpy(rsn, "too short (even header won't fit)");
 765                goto err;
 766        }
 767        if (hdr->magic != cpu_to_le32(0x30343034)) {
 768                sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
 769                goto err;
 770        }
 771        if (hdr->type != 3) {
 772                sprintf(rsn, "not for linux, type is %u", hdr->type);
 773                goto err;
 774        }
 775        if (moxa_check_fw_model(brd, hdr->model)) {
 776                sprintf(rsn, "not for this card, model is %u", hdr->model);
 777                goto err;
 778        }
 779
 780        len = MOXA_FW_HDRLEN;
 781        lencnt = hdr->model == 2 ? 5 : 3;
 782        for (a = 0; a < ARRAY_SIZE(lens); a++) {
 783                lens[a] = le16_to_cpu(hdr->len[a]);
 784                if (lens[a] && len + lens[a] <= fw->size &&
 785                                moxa_check_fw(&fw->data[len]))
 786                        printk(KERN_WARNING "MOXA firmware: unexpected input "
 787                                "at offset %u, but going on\n", (u32)len);
 788                if (!lens[a] && a < lencnt) {
 789                        sprintf(rsn, "too few entries in fw file");
 790                        goto err;
 791                }
 792                len += lens[a];
 793        }
 794
 795        if (len != fw->size) {
 796                sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
 797                                (u32)len);
 798                goto err;
 799        }
 800
 801        ptr += MOXA_FW_HDRLEN;
 802        lenp = 0; /* bios */
 803
 804        strcpy(rsn, "read above");
 805
 806        ret = moxa_load_bios(brd, ptr, lens[lenp]);
 807        if (ret)
 808                goto err;
 809
 810        /* we skip the tty section (lens[1]), since we don't need it */
 811        ptr += lens[lenp] + lens[lenp + 1];
 812        lenp += 2; /* comm */
 813
 814        if (hdr->model == 2) {
 815                ret = moxa_load_320b(brd, ptr, lens[lenp]);
 816                if (ret)
 817                        goto err;
 818                /* skip another tty */
 819                ptr += lens[lenp] + lens[lenp + 1];
 820                lenp += 2;
 821        }
 822
 823        ret = moxa_load_code(brd, ptr, lens[lenp]);
 824        if (ret)
 825                goto err;
 826
 827        return 0;
 828err:
 829        printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
 830        return ret;
 831}
 832
 833static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
 834{
 835        const struct firmware *fw;
 836        const char *file;
 837        struct moxa_port *p;
 838        unsigned int i, first_idx;
 839        int ret;
 840
 841        brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
 842                        GFP_KERNEL);
 843        if (brd->ports == NULL) {
 844                printk(KERN_ERR "cannot allocate memory for ports\n");
 845                ret = -ENOMEM;
 846                goto err;
 847        }
 848
 849        for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
 850                tty_port_init(&p->port);
 851                p->port.ops = &moxa_port_ops;
 852                p->type = PORT_16550A;
 853                p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
 854        }
 855
 856        switch (brd->boardType) {
 857        case MOXA_BOARD_C218_ISA:
 858        case MOXA_BOARD_C218_PCI:
 859                file = "c218tunx.cod";
 860                break;
 861        case MOXA_BOARD_CP204J:
 862                file = "cp204unx.cod";
 863                break;
 864        default:
 865                file = "c320tunx.cod";
 866                break;
 867        }
 868
 869        ret = request_firmware(&fw, file, dev);
 870        if (ret) {
 871                printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
 872                                "you've placed '%s' file into your firmware "
 873                                "loader directory (e.g. /lib/firmware)\n",
 874                                file);
 875                goto err_free;
 876        }
 877
 878        ret = moxa_load_fw(brd, fw);
 879
 880        release_firmware(fw);
 881
 882        if (ret)
 883                goto err_free;
 884
 885        spin_lock_bh(&moxa_lock);
 886        brd->ready = 1;
 887        if (!timer_pending(&moxaTimer))
 888                mod_timer(&moxaTimer, jiffies + HZ / 50);
 889        spin_unlock_bh(&moxa_lock);
 890
 891        first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
 892        for (i = 0; i < brd->numPorts; i++)
 893                tty_port_register_device(&brd->ports[i].port, moxaDriver,
 894                                first_idx + i, dev);
 895
 896        return 0;
 897err_free:
 898        for (i = 0; i < MAX_PORTS_PER_BOARD; i++)
 899                tty_port_destroy(&brd->ports[i].port);
 900        kfree(brd->ports);
 901err:
 902        return ret;
 903}
 904
 905static void moxa_board_deinit(struct moxa_board_conf *brd)
 906{
 907        unsigned int a, opened, first_idx;
 908
 909        mutex_lock(&moxa_openlock);
 910        spin_lock_bh(&moxa_lock);
 911        brd->ready = 0;
 912        spin_unlock_bh(&moxa_lock);
 913
 914        /* pci hot-un-plug support */
 915        for (a = 0; a < brd->numPorts; a++)
 916                if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
 917                        struct tty_struct *tty = tty_port_tty_get(
 918                                                &brd->ports[a].port);
 919                        if (tty) {
 920                                tty_hangup(tty);
 921                                tty_kref_put(tty);
 922                        }
 923                }
 924        for (a = 0; a < MAX_PORTS_PER_BOARD; a++)
 925                tty_port_destroy(&brd->ports[a].port);
 926        while (1) {
 927                opened = 0;
 928                for (a = 0; a < brd->numPorts; a++)
 929                        if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
 930                                opened++;
 931                mutex_unlock(&moxa_openlock);
 932                if (!opened)
 933                        break;
 934                msleep(50);
 935                mutex_lock(&moxa_openlock);
 936        }
 937
 938        first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
 939        for (a = 0; a < brd->numPorts; a++)
 940                tty_unregister_device(moxaDriver, first_idx + a);
 941
 942        iounmap(brd->basemem);
 943        brd->basemem = NULL;
 944        kfree(brd->ports);
 945}
 946
 947#ifdef CONFIG_PCI
 948static int moxa_pci_probe(struct pci_dev *pdev,
 949                const struct pci_device_id *ent)
 950{
 951        struct moxa_board_conf *board;
 952        unsigned int i;
 953        int board_type = ent->driver_data;
 954        int retval;
 955
 956        retval = pci_enable_device(pdev);
 957        if (retval) {
 958                dev_err(&pdev->dev, "can't enable pci device\n");
 959                goto err;
 960        }
 961
 962        for (i = 0; i < MAX_BOARDS; i++)
 963                if (moxa_boards[i].basemem == NULL)
 964                        break;
 965
 966        retval = -ENODEV;
 967        if (i >= MAX_BOARDS) {
 968                dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
 969                                "found. Board is ignored.\n", MAX_BOARDS);
 970                goto err;
 971        }
 972
 973        board = &moxa_boards[i];
 974
 975        retval = pci_request_region(pdev, 2, "moxa-base");
 976        if (retval) {
 977                dev_err(&pdev->dev, "can't request pci region 2\n");
 978                goto err;
 979        }
 980
 981        board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
 982        if (board->basemem == NULL) {
 983                dev_err(&pdev->dev, "can't remap io space 2\n");
 984                retval = -ENOMEM;
 985                goto err_reg;
 986        }
 987
 988        board->boardType = board_type;
 989        switch (board_type) {
 990        case MOXA_BOARD_C218_ISA:
 991        case MOXA_BOARD_C218_PCI:
 992                board->numPorts = 8;
 993                break;
 994
 995        case MOXA_BOARD_CP204J:
 996                board->numPorts = 4;
 997                break;
 998        default:
 999                board->numPorts = 0;
1000                break;
1001        }
1002        board->busType = MOXA_BUS_TYPE_PCI;
1003
1004        retval = moxa_init_board(board, &pdev->dev);
1005        if (retval)
1006                goto err_base;
1007
1008        pci_set_drvdata(pdev, board);
1009
1010        dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
1011                        moxa_brdname[board_type - 1], board->numPorts);
1012
1013        return 0;
1014err_base:
1015        iounmap(board->basemem);
1016        board->basemem = NULL;
1017err_reg:
1018        pci_release_region(pdev, 2);
1019err:
1020        return retval;
1021}
1022
1023static void moxa_pci_remove(struct pci_dev *pdev)
1024{
1025        struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1026
1027        moxa_board_deinit(brd);
1028
1029        pci_release_region(pdev, 2);
1030}
1031
1032static struct pci_driver moxa_pci_driver = {
1033        .name = "moxa",
1034        .id_table = moxa_pcibrds,
1035        .probe = moxa_pci_probe,
1036        .remove = moxa_pci_remove
1037};
1038#endif /* CONFIG_PCI */
1039
1040static int __init moxa_init(void)
1041{
1042        unsigned int isabrds = 0;
1043        int retval = 0;
1044        struct moxa_board_conf *brd = moxa_boards;
1045        unsigned int i;
1046
1047        printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1048                        MOXA_VERSION);
1049
1050        tty_port_init(&moxa_service_port);
1051
1052        moxaDriver = tty_alloc_driver(MAX_PORTS + 1,
1053                        TTY_DRIVER_REAL_RAW |
1054                        TTY_DRIVER_DYNAMIC_DEV);
1055        if (IS_ERR(moxaDriver))
1056                return PTR_ERR(moxaDriver);
1057
1058        moxaDriver->name = "ttyMX";
1059        moxaDriver->major = ttymajor;
1060        moxaDriver->minor_start = 0;
1061        moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1062        moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1063        moxaDriver->init_termios = tty_std_termios;
1064        moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1065        moxaDriver->init_termios.c_ispeed = 9600;
1066        moxaDriver->init_termios.c_ospeed = 9600;
1067        tty_set_operations(moxaDriver, &moxa_ops);
1068        /* Having one more port only for ioctls is ugly */
1069        tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS);
1070
1071        if (tty_register_driver(moxaDriver)) {
1072                printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1073                put_tty_driver(moxaDriver);
1074                return -1;
1075        }
1076
1077        /* Find the boards defined from module args. */
1078
1079        for (i = 0; i < MAX_BOARDS; i++) {
1080                if (!baseaddr[i])
1081                        break;
1082                if (type[i] == MOXA_BOARD_C218_ISA ||
1083                                type[i] == MOXA_BOARD_C320_ISA) {
1084                        pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1085                                        isabrds + 1, moxa_brdname[type[i] - 1],
1086                                        baseaddr[i]);
1087                        brd->boardType = type[i];
1088                        brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1089                                        numports[i];
1090                        brd->busType = MOXA_BUS_TYPE_ISA;
1091                        brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1092                        if (!brd->basemem) {
1093                                printk(KERN_ERR "MOXA: can't remap %lx\n",
1094                                                baseaddr[i]);
1095                                continue;
1096                        }
1097                        if (moxa_init_board(brd, NULL)) {
1098                                iounmap(brd->basemem);
1099                                brd->basemem = NULL;
1100                                continue;
1101                        }
1102
1103                        printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1104                                        "ready (%u ports, firmware loaded)\n",
1105                                        baseaddr[i], brd->numPorts);
1106
1107                        brd++;
1108                        isabrds++;
1109                }
1110        }
1111
1112#ifdef CONFIG_PCI
1113        retval = pci_register_driver(&moxa_pci_driver);
1114        if (retval) {
1115                printk(KERN_ERR "Can't register MOXA pci driver!\n");
1116                if (isabrds)
1117                        retval = 0;
1118        }
1119#endif
1120
1121        return retval;
1122}
1123
1124static void __exit moxa_exit(void)
1125{
1126        unsigned int i;
1127
1128#ifdef CONFIG_PCI
1129        pci_unregister_driver(&moxa_pci_driver);
1130#endif
1131
1132        for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1133                if (moxa_boards[i].ready)
1134                        moxa_board_deinit(&moxa_boards[i]);
1135
1136        del_timer_sync(&moxaTimer);
1137
1138        if (tty_unregister_driver(moxaDriver))
1139                printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1140                                "serial driver\n");
1141        put_tty_driver(moxaDriver);
1142}
1143
1144module_init(moxa_init);
1145module_exit(moxa_exit);
1146
1147static void moxa_shutdown(struct tty_port *port)
1148{
1149        struct moxa_port *ch = container_of(port, struct moxa_port, port);
1150        MoxaPortDisable(ch);
1151        MoxaPortFlushData(ch, 2);
1152}
1153
1154static int moxa_carrier_raised(struct tty_port *port)
1155{
1156        struct moxa_port *ch = container_of(port, struct moxa_port, port);
1157        int dcd;
1158
1159        spin_lock_irq(&port->lock);
1160        dcd = ch->DCDState;
1161        spin_unlock_irq(&port->lock);
1162        return dcd;
1163}
1164
1165static void moxa_dtr_rts(struct tty_port *port, int onoff)
1166{
1167        struct moxa_port *ch = container_of(port, struct moxa_port, port);
1168        MoxaPortLineCtrl(ch, onoff, onoff);
1169}
1170
1171
1172static int moxa_open(struct tty_struct *tty, struct file *filp)
1173{
1174        struct moxa_board_conf *brd;
1175        struct moxa_port *ch;
1176        int port;
1177
1178        port = tty->index;
1179        if (port == MAX_PORTS) {
1180                return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1181        }
1182        if (mutex_lock_interruptible(&moxa_openlock))
1183                return -ERESTARTSYS;
1184        brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1185        if (!brd->ready) {
1186                mutex_unlock(&moxa_openlock);
1187                return -ENODEV;
1188        }
1189
1190        if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1191                mutex_unlock(&moxa_openlock);
1192                return -ENODEV;
1193        }
1194
1195        ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1196        ch->port.count++;
1197        tty->driver_data = ch;
1198        tty_port_tty_set(&ch->port, tty);
1199        mutex_lock(&ch->port.mutex);
1200        if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1201                ch->statusflags = 0;
1202                moxa_set_tty_param(tty, &tty->termios);
1203                MoxaPortLineCtrl(ch, 1, 1);
1204                MoxaPortEnable(ch);
1205                MoxaSetFifo(ch, ch->type == PORT_16550A);
1206                ch->port.flags |= ASYNC_INITIALIZED;
1207        }
1208        mutex_unlock(&ch->port.mutex);
1209        mutex_unlock(&moxa_openlock);
1210
1211        return tty_port_block_til_ready(&ch->port, tty, filp);
1212}
1213
1214static void moxa_close(struct tty_struct *tty, struct file *filp)
1215{
1216        struct moxa_port *ch = tty->driver_data;
1217        ch->cflag = tty->termios.c_cflag;
1218        tty_port_close(&ch->port, tty, filp);
1219}
1220
1221static int moxa_write(struct tty_struct *tty,
1222                      const unsigned char *buf, int count)
1223{
1224        struct moxa_port *ch = tty->driver_data;
1225        unsigned long flags;
1226        int len;
1227
1228        if (ch == NULL)
1229                return 0;
1230
1231        spin_lock_irqsave(&moxa_lock, flags);
1232        len = MoxaPortWriteData(tty, buf, count);
1233        spin_unlock_irqrestore(&moxa_lock, flags);
1234
1235        set_bit(LOWWAIT, &ch->statusflags);
1236        return len;
1237}
1238
1239static int moxa_write_room(struct tty_struct *tty)
1240{
1241        struct moxa_port *ch;
1242
1243        if (tty->stopped)
1244                return 0;
1245        ch = tty->driver_data;
1246        if (ch == NULL)
1247                return 0;
1248        return MoxaPortTxFree(ch);
1249}
1250
1251static void moxa_flush_buffer(struct tty_struct *tty)
1252{
1253        struct moxa_port *ch = tty->driver_data;
1254
1255        if (ch == NULL)
1256                return;
1257        MoxaPortFlushData(ch, 1);
1258        tty_wakeup(tty);
1259}
1260
1261static int moxa_chars_in_buffer(struct tty_struct *tty)
1262{
1263        struct moxa_port *ch = tty->driver_data;
1264        int chars;
1265
1266        chars = MoxaPortTxQueue(ch);
1267        if (chars)
1268                /*
1269                 * Make it possible to wakeup anything waiting for output
1270                 * in tty_ioctl.c, etc.
1271                 */
1272                set_bit(EMPTYWAIT, &ch->statusflags);
1273        return chars;
1274}
1275
1276static int moxa_tiocmget(struct tty_struct *tty)
1277{
1278        struct moxa_port *ch = tty->driver_data;
1279        int flag = 0, dtr, rts;
1280
1281        MoxaPortGetLineOut(ch, &dtr, &rts);
1282        if (dtr)
1283                flag |= TIOCM_DTR;
1284        if (rts)
1285                flag |= TIOCM_RTS;
1286        dtr = MoxaPortLineStatus(ch);
1287        if (dtr & 1)
1288                flag |= TIOCM_CTS;
1289        if (dtr & 2)
1290                flag |= TIOCM_DSR;
1291        if (dtr & 4)
1292                flag |= TIOCM_CD;
1293        return flag;
1294}
1295
1296static int moxa_tiocmset(struct tty_struct *tty,
1297                         unsigned int set, unsigned int clear)
1298{
1299        struct moxa_port *ch;
1300        int dtr, rts;
1301
1302        mutex_lock(&moxa_openlock);
1303        ch = tty->driver_data;
1304        if (!ch) {
1305                mutex_unlock(&moxa_openlock);
1306                return -EINVAL;
1307        }
1308
1309        MoxaPortGetLineOut(ch, &dtr, &rts);
1310        if (set & TIOCM_RTS)
1311                rts = 1;
1312        if (set & TIOCM_DTR)
1313                dtr = 1;
1314        if (clear & TIOCM_RTS)
1315                rts = 0;
1316        if (clear & TIOCM_DTR)
1317                dtr = 0;
1318        MoxaPortLineCtrl(ch, dtr, rts);
1319        mutex_unlock(&moxa_openlock);
1320        return 0;
1321}
1322
1323static void moxa_set_termios(struct tty_struct *tty,
1324                struct ktermios *old_termios)
1325{
1326        struct moxa_port *ch = tty->driver_data;
1327
1328        if (ch == NULL)
1329                return;
1330        moxa_set_tty_param(tty, old_termios);
1331        if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1332                wake_up_interruptible(&ch->port.open_wait);
1333}
1334
1335static void moxa_stop(struct tty_struct *tty)
1336{
1337        struct moxa_port *ch = tty->driver_data;
1338
1339        if (ch == NULL)
1340                return;
1341        MoxaPortTxDisable(ch);
1342        set_bit(TXSTOPPED, &ch->statusflags);
1343}
1344
1345
1346static void moxa_start(struct tty_struct *tty)
1347{
1348        struct moxa_port *ch = tty->driver_data;
1349
1350        if (ch == NULL)
1351                return;
1352
1353        if (!test_bit(TXSTOPPED, &ch->statusflags))
1354                return;
1355
1356        MoxaPortTxEnable(ch);
1357        clear_bit(TXSTOPPED, &ch->statusflags);
1358}
1359
1360static void moxa_hangup(struct tty_struct *tty)
1361{
1362        struct moxa_port *ch = tty->driver_data;
1363        tty_port_hangup(&ch->port);
1364}
1365
1366static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1367{
1368        struct tty_struct *tty;
1369        unsigned long flags;
1370        dcd = !!dcd;
1371
1372        spin_lock_irqsave(&p->port.lock, flags);
1373        if (dcd != p->DCDState) {
1374                p->DCDState = dcd;
1375                spin_unlock_irqrestore(&p->port.lock, flags);
1376                tty = tty_port_tty_get(&p->port);
1377                if (tty && !C_CLOCAL(tty) && !dcd)
1378                        tty_hangup(tty);
1379                tty_kref_put(tty);
1380        }
1381        else
1382                spin_unlock_irqrestore(&p->port.lock, flags);
1383}
1384
1385static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1386                u16 __iomem *ip)
1387{
1388        struct tty_struct *tty = tty_port_tty_get(&p->port);
1389        void __iomem *ofsAddr;
1390        unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1391        u16 intr;
1392
1393        if (tty) {
1394                if (test_bit(EMPTYWAIT, &p->statusflags) &&
1395                                MoxaPortTxQueue(p) == 0) {
1396                        clear_bit(EMPTYWAIT, &p->statusflags);
1397                        tty_wakeup(tty);
1398                }
1399                if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1400                                MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1401                        clear_bit(LOWWAIT, &p->statusflags);
1402                        tty_wakeup(tty);
1403                }
1404
1405                if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
1406                                MoxaPortRxQueue(p) > 0) { /* RX */
1407                        MoxaPortReadData(p);
1408                        tty_schedule_flip(&p->port);
1409                }
1410        } else {
1411                clear_bit(EMPTYWAIT, &p->statusflags);
1412                MoxaPortFlushData(p, 0); /* flush RX */
1413        }
1414
1415        if (!handle) /* nothing else to do */
1416                goto put;
1417
1418        intr = readw(ip); /* port irq status */
1419        if (intr == 0)
1420                goto put;
1421
1422        writew(0, ip); /* ACK port */
1423        ofsAddr = p->tableAddr;
1424        if (intr & IntrTx) /* disable tx intr */
1425                writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1426                                ofsAddr + HostStat);
1427
1428        if (!inited)
1429                goto put;
1430
1431        if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1432                tty_insert_flip_char(&p->port, 0, TTY_BREAK);
1433                tty_schedule_flip(&p->port);
1434        }
1435
1436        if (intr & IntrLine)
1437                moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1438put:
1439        tty_kref_put(tty);
1440
1441        return 0;
1442}
1443
1444static void moxa_poll(unsigned long ignored)
1445{
1446        struct moxa_board_conf *brd;
1447        u16 __iomem *ip;
1448        unsigned int card, port, served = 0;
1449
1450        spin_lock(&moxa_lock);
1451        for (card = 0; card < MAX_BOARDS; card++) {
1452                brd = &moxa_boards[card];
1453                if (!brd->ready)
1454                        continue;
1455
1456                served++;
1457
1458                ip = NULL;
1459                if (readb(brd->intPend) == 0xff)
1460                        ip = brd->intTable + readb(brd->intNdx);
1461
1462                for (port = 0; port < brd->numPorts; port++)
1463                        moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1464
1465                if (ip)
1466                        writeb(0, brd->intPend); /* ACK */
1467
1468                if (moxaLowWaterChk) {
1469                        struct moxa_port *p = brd->ports;
1470                        for (port = 0; port < brd->numPorts; port++, p++)
1471                                if (p->lowChkFlag) {
1472                                        p->lowChkFlag = 0;
1473                                        moxa_low_water_check(p->tableAddr);
1474                                }
1475                }
1476        }
1477        moxaLowWaterChk = 0;
1478
1479        if (served)
1480                mod_timer(&moxaTimer, jiffies + HZ / 50);
1481        spin_unlock(&moxa_lock);
1482}
1483
1484/******************************************************************************/
1485
1486static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1487{
1488        register struct ktermios *ts = &tty->termios;
1489        struct moxa_port *ch = tty->driver_data;
1490        int rts, cts, txflow, rxflow, xany, baud;
1491
1492        rts = cts = txflow = rxflow = xany = 0;
1493        if (ts->c_cflag & CRTSCTS)
1494                rts = cts = 1;
1495        if (ts->c_iflag & IXON)
1496                txflow = 1;
1497        if (ts->c_iflag & IXOFF)
1498                rxflow = 1;
1499        if (ts->c_iflag & IXANY)
1500                xany = 1;
1501
1502        /* Clear the features we don't support */
1503        ts->c_cflag &= ~CMSPAR;
1504        MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1505        baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1506        if (baud == -1)
1507                baud = tty_termios_baud_rate(old_termios);
1508        /* Not put the baud rate into the termios data */
1509        tty_encode_baud_rate(tty, baud, baud);
1510}
1511
1512/*****************************************************************************
1513 *      Driver level functions:                                              *
1514 *****************************************************************************/
1515
1516static void MoxaPortFlushData(struct moxa_port *port, int mode)
1517{
1518        void __iomem *ofsAddr;
1519        if (mode < 0 || mode > 2)
1520                return;
1521        ofsAddr = port->tableAddr;
1522        moxafunc(ofsAddr, FC_FlushQueue, mode);
1523        if (mode != 1) {
1524                port->lowChkFlag = 0;
1525                moxa_low_water_check(ofsAddr);
1526        }
1527}
1528
1529/*
1530 *    Moxa Port Number Description:
1531 *
1532 *      MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1533 *      the port number using in MOXA driver functions will be 0 to 31 for
1534 *      first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1535 *      to 127 for fourth. For example, if you setup three MOXA boards,
1536 *      first board is C218, second board is C320-16 and third board is
1537 *      C320-32. The port number of first board (C218 - 8 ports) is from
1538 *      0 to 7. The port number of second board (C320 - 16 ports) is form
1539 *      32 to 47. The port number of third board (C320 - 32 ports) is from
1540 *      64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1541 *      127 will be invalid.
1542 *
1543 *
1544 *      Moxa Functions Description:
1545 *
1546 *      Function 1:     Driver initialization routine, this routine must be
1547 *                      called when initialized driver.
1548 *      Syntax:
1549 *      void MoxaDriverInit();
1550 *
1551 *
1552 *      Function 2:     Moxa driver private IOCTL command processing.
1553 *      Syntax:
1554 *      int  MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1555 *
1556 *           unsigned int cmd   : IOCTL command
1557 *           unsigned long arg  : IOCTL argument
1558 *           int port           : port number (0 - 127)
1559 *
1560 *           return:    0  (OK)
1561 *                      -EINVAL
1562 *                      -ENOIOCTLCMD
1563 *
1564 *
1565 *      Function 6:     Enable this port to start Tx/Rx data.
1566 *      Syntax:
1567 *      void MoxaPortEnable(int port);
1568 *           int port           : port number (0 - 127)
1569 *
1570 *
1571 *      Function 7:     Disable this port
1572 *      Syntax:
1573 *      void MoxaPortDisable(int port);
1574 *           int port           : port number (0 - 127)
1575 *
1576 *
1577 *      Function 10:    Setting baud rate of this port.
1578 *      Syntax:
1579 *      speed_t MoxaPortSetBaud(int port, speed_t baud);
1580 *           int port           : port number (0 - 127)
1581 *           long baud          : baud rate (50 - 115200)
1582 *
1583 *           return:    0       : this port is invalid or baud < 50
1584 *                      50 - 115200 : the real baud rate set to the port, if
1585 *                                    the argument baud is large than maximun
1586 *                                    available baud rate, the real setting
1587 *                                    baud rate will be the maximun baud rate.
1588 *
1589 *
1590 *      Function 12:    Configure the port.
1591 *      Syntax:
1592 *      int  MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1593 *           int port           : port number (0 - 127)
1594 *           struct ktermios * termio : termio structure pointer
1595 *           speed_t baud       : baud rate
1596 *
1597 *           return:    -1      : this port is invalid or termio == NULL
1598 *                      0       : setting O.K.
1599 *
1600 *
1601 *      Function 13:    Get the DTR/RTS state of this port.
1602 *      Syntax:
1603 *      int  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1604 *           int port           : port number (0 - 127)
1605 *           int * dtrState     : pointer to INT to receive the current DTR
1606 *                                state. (if NULL, this function will not
1607 *                                write to this address)
1608 *           int * rtsState     : pointer to INT to receive the current RTS
1609 *                                state. (if NULL, this function will not
1610 *                                write to this address)
1611 *
1612 *           return:    -1      : this port is invalid
1613 *                      0       : O.K.
1614 *
1615 *
1616 *      Function 14:    Setting the DTR/RTS output state of this port.
1617 *      Syntax:
1618 *      void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1619 *           int port           : port number (0 - 127)
1620 *           int dtrState       : DTR output state (0: off, 1: on)
1621 *           int rtsState       : RTS output state (0: off, 1: on)
1622 *
1623 *
1624 *      Function 15:    Setting the flow control of this port.
1625 *      Syntax:
1626 *      void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1627 *                            int txFlow,int xany);
1628 *           int port           : port number (0 - 127)
1629 *           int rtsFlow        : H/W RTS flow control (0: no, 1: yes)
1630 *           int ctsFlow        : H/W CTS flow control (0: no, 1: yes)
1631 *           int rxFlow         : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1632 *           int txFlow         : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1633 *           int xany           : S/W XANY flow control (0: no, 1: yes)
1634 *
1635 *
1636 *      Function 16:    Get ths line status of this port
1637 *      Syntax:
1638 *      int  MoxaPortLineStatus(int port);
1639 *           int port           : port number (0 - 127)
1640 *
1641 *           return:    Bit 0 - CTS state (0: off, 1: on)
1642 *                      Bit 1 - DSR state (0: off, 1: on)
1643 *                      Bit 2 - DCD state (0: off, 1: on)
1644 *
1645 *
1646 *      Function 19:    Flush the Rx/Tx buffer data of this port.
1647 *      Syntax:
1648 *      void MoxaPortFlushData(int port, int mode);
1649 *           int port           : port number (0 - 127)
1650 *           int mode    
1651 *                      0       : flush the Rx buffer 
1652 *                      1       : flush the Tx buffer 
1653 *                      2       : flush the Rx and Tx buffer 
1654 *
1655 *
1656 *      Function 20:    Write data.
1657 *      Syntax:
1658 *      int  MoxaPortWriteData(int port, unsigned char * buffer, int length);
1659 *           int port           : port number (0 - 127)
1660 *           unsigned char * buffer     : pointer to write data buffer.
1661 *           int length         : write data length
1662 *
1663 *           return:    0 - length      : real write data length
1664 *
1665 *
1666 *      Function 21:    Read data.
1667 *      Syntax:
1668 *      int  MoxaPortReadData(int port, struct tty_struct *tty);
1669 *           int port           : port number (0 - 127)
1670 *           struct tty_struct *tty : tty for data
1671 *
1672 *           return:    0 - length      : real read data length
1673 *
1674 *
1675 *      Function 24:    Get the Tx buffer current queued data bytes
1676 *      Syntax:
1677 *      int  MoxaPortTxQueue(int port);
1678 *           int port           : port number (0 - 127)
1679 *
1680 *           return:    ..      : Tx buffer current queued data bytes
1681 *
1682 *
1683 *      Function 25:    Get the Tx buffer current free space
1684 *      Syntax:
1685 *      int  MoxaPortTxFree(int port);
1686 *           int port           : port number (0 - 127)
1687 *
1688 *           return:    ..      : Tx buffer current free space
1689 *
1690 *
1691 *      Function 26:    Get the Rx buffer current queued data bytes
1692 *      Syntax:
1693 *      int  MoxaPortRxQueue(int port);
1694 *           int port           : port number (0 - 127)
1695 *
1696 *           return:    ..      : Rx buffer current queued data bytes
1697 *
1698 *
1699 *      Function 28:    Disable port data transmission.
1700 *      Syntax:
1701 *      void MoxaPortTxDisable(int port);
1702 *           int port           : port number (0 - 127)
1703 *
1704 *
1705 *      Function 29:    Enable port data transmission.
1706 *      Syntax:
1707 *      void MoxaPortTxEnable(int port);
1708 *           int port           : port number (0 - 127)
1709 *
1710 *
1711 *      Function 31:    Get the received BREAK signal count and reset it.
1712 *      Syntax:
1713 *      int  MoxaPortResetBrkCnt(int port);
1714 *           int port           : port number (0 - 127)
1715 *
1716 *           return:    0 - ..  : BREAK signal count
1717 *
1718 *
1719 */
1720
1721static void MoxaPortEnable(struct moxa_port *port)
1722{
1723        void __iomem *ofsAddr;
1724        u16 lowwater = 512;
1725
1726        ofsAddr = port->tableAddr;
1727        writew(lowwater, ofsAddr + Low_water);
1728        if (MOXA_IS_320(port->board))
1729                moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1730        else
1731                writew(readw(ofsAddr + HostStat) | WakeupBreak,
1732                                ofsAddr + HostStat);
1733
1734        moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1735        moxafunc(ofsAddr, FC_FlushQueue, 2);
1736
1737        moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1738        MoxaPortLineStatus(port);
1739}
1740
1741static void MoxaPortDisable(struct moxa_port *port)
1742{
1743        void __iomem *ofsAddr = port->tableAddr;
1744
1745        moxafunc(ofsAddr, FC_SetFlowCtl, 0);    /* disable flow control */
1746        moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1747        writew(0, ofsAddr + HostStat);
1748        moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1749}
1750
1751static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1752{
1753        void __iomem *ofsAddr = port->tableAddr;
1754        unsigned int clock, val;
1755        speed_t max;
1756
1757        max = MOXA_IS_320(port->board) ? 460800 : 921600;
1758        if (baud < 50)
1759                return 0;
1760        if (baud > max)
1761                baud = max;
1762        clock = 921600;
1763        val = clock / baud;
1764        moxafunc(ofsAddr, FC_SetBaud, val);
1765        baud = clock / val;
1766        return baud;
1767}
1768
1769static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1770                speed_t baud)
1771{
1772        void __iomem *ofsAddr;
1773        tcflag_t mode = 0;
1774
1775        ofsAddr = port->tableAddr;
1776
1777        mode = termio->c_cflag & CSIZE;
1778        if (mode == CS5)
1779                mode = MX_CS5;
1780        else if (mode == CS6)
1781                mode = MX_CS6;
1782        else if (mode == CS7)
1783                mode = MX_CS7;
1784        else if (mode == CS8)
1785                mode = MX_CS8;
1786
1787        if (termio->c_cflag & CSTOPB) {
1788                if (mode == MX_CS5)
1789                        mode |= MX_STOP15;
1790                else
1791                        mode |= MX_STOP2;
1792        } else
1793                mode |= MX_STOP1;
1794
1795        if (termio->c_cflag & PARENB) {
1796                if (termio->c_cflag & PARODD)
1797                        mode |= MX_PARODD;
1798                else
1799                        mode |= MX_PAREVEN;
1800        } else
1801                mode |= MX_PARNONE;
1802
1803        moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1804
1805        if (MOXA_IS_320(port->board) && baud >= 921600)
1806                return -1;
1807
1808        baud = MoxaPortSetBaud(port, baud);
1809
1810        if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1811                spin_lock_irq(&moxafunc_lock);
1812                writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1813                writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1814                writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1815                moxa_wait_finish(ofsAddr);
1816                spin_unlock_irq(&moxafunc_lock);
1817
1818        }
1819        return baud;
1820}
1821
1822static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1823                int *rtsState)
1824{
1825        if (dtrState)
1826                *dtrState = !!(port->lineCtrl & DTR_ON);
1827        if (rtsState)
1828                *rtsState = !!(port->lineCtrl & RTS_ON);
1829
1830        return 0;
1831}
1832
1833static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1834{
1835        u8 mode = 0;
1836
1837        if (dtr)
1838                mode |= DTR_ON;
1839        if (rts)
1840                mode |= RTS_ON;
1841        port->lineCtrl = mode;
1842        moxafunc(port->tableAddr, FC_LineControl, mode);
1843}
1844
1845static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1846                int txflow, int rxflow, int txany)
1847{
1848        int mode = 0;
1849
1850        if (rts)
1851                mode |= RTS_FlowCtl;
1852        if (cts)
1853                mode |= CTS_FlowCtl;
1854        if (txflow)
1855                mode |= Tx_FlowCtl;
1856        if (rxflow)
1857                mode |= Rx_FlowCtl;
1858        if (txany)
1859                mode |= IXM_IXANY;
1860        moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1861}
1862
1863static int MoxaPortLineStatus(struct moxa_port *port)
1864{
1865        void __iomem *ofsAddr;
1866        int val;
1867
1868        ofsAddr = port->tableAddr;
1869        if (MOXA_IS_320(port->board))
1870                val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1871        else
1872                val = readw(ofsAddr + FlagStat) >> 4;
1873        val &= 0x0B;
1874        if (val & 8)
1875                val |= 4;
1876        moxa_new_dcdstate(port, val & 8);
1877        val &= 7;
1878        return val;
1879}
1880
1881static int MoxaPortWriteData(struct tty_struct *tty,
1882                const unsigned char *buffer, int len)
1883{
1884        struct moxa_port *port = tty->driver_data;
1885        void __iomem *baseAddr, *ofsAddr, *ofs;
1886        unsigned int c, total;
1887        u16 head, tail, tx_mask, spage, epage;
1888        u16 pageno, pageofs, bufhead;
1889
1890        ofsAddr = port->tableAddr;
1891        baseAddr = port->board->basemem;
1892        tx_mask = readw(ofsAddr + TX_mask);
1893        spage = readw(ofsAddr + Page_txb);
1894        epage = readw(ofsAddr + EndPage_txb);
1895        tail = readw(ofsAddr + TXwptr);
1896        head = readw(ofsAddr + TXrptr);
1897        c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1898        if (c > len)
1899                c = len;
1900        moxaLog.txcnt[port->port.tty->index] += c;
1901        total = c;
1902        if (spage == epage) {
1903                bufhead = readw(ofsAddr + Ofs_txb);
1904                writew(spage, baseAddr + Control_reg);
1905                while (c > 0) {
1906                        if (head > tail)
1907                                len = head - tail - 1;
1908                        else
1909                                len = tx_mask + 1 - tail;
1910                        len = (c > len) ? len : c;
1911                        ofs = baseAddr + DynPage_addr + bufhead + tail;
1912                        memcpy_toio(ofs, buffer, len);
1913                        buffer += len;
1914                        tail = (tail + len) & tx_mask;
1915                        c -= len;
1916                }
1917        } else {
1918                pageno = spage + (tail >> 13);
1919                pageofs = tail & Page_mask;
1920                while (c > 0) {
1921                        len = Page_size - pageofs;
1922                        if (len > c)
1923                                len = c;
1924                        writeb(pageno, baseAddr + Control_reg);
1925                        ofs = baseAddr + DynPage_addr + pageofs;
1926                        memcpy_toio(ofs, buffer, len);
1927                        buffer += len;
1928                        if (++pageno == epage)
1929                                pageno = spage;
1930                        pageofs = 0;
1931                        c -= len;
1932                }
1933                tail = (tail + total) & tx_mask;
1934        }
1935        writew(tail, ofsAddr + TXwptr);
1936        writeb(1, ofsAddr + CD180TXirq);        /* start to send */
1937        return total;
1938}
1939
1940static int MoxaPortReadData(struct moxa_port *port)
1941{
1942        struct tty_struct *tty = port->port.tty;
1943        unsigned char *dst;
1944        void __iomem *baseAddr, *ofsAddr, *ofs;
1945        unsigned int count, len, total;
1946        u16 tail, rx_mask, spage, epage;
1947        u16 pageno, pageofs, bufhead, head;
1948
1949        ofsAddr = port->tableAddr;
1950        baseAddr = port->board->basemem;
1951        head = readw(ofsAddr + RXrptr);
1952        tail = readw(ofsAddr + RXwptr);
1953        rx_mask = readw(ofsAddr + RX_mask);
1954        spage = readw(ofsAddr + Page_rxb);
1955        epage = readw(ofsAddr + EndPage_rxb);
1956        count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1957        if (count == 0)
1958                return 0;
1959
1960        total = count;
1961        moxaLog.rxcnt[tty->index] += total;
1962        if (spage == epage) {
1963                bufhead = readw(ofsAddr + Ofs_rxb);
1964                writew(spage, baseAddr + Control_reg);
1965                while (count > 0) {
1966                        ofs = baseAddr + DynPage_addr + bufhead + head;
1967                        len = (tail >= head) ? (tail - head) :
1968                                        (rx_mask + 1 - head);
1969                        len = tty_prepare_flip_string(&port->port, &dst,
1970                                        min(len, count));
1971                        memcpy_fromio(dst, ofs, len);
1972                        head = (head + len) & rx_mask;
1973                        count -= len;
1974                }
1975        } else {
1976                pageno = spage + (head >> 13);
1977                pageofs = head & Page_mask;
1978                while (count > 0) {
1979                        writew(pageno, baseAddr + Control_reg);
1980                        ofs = baseAddr + DynPage_addr + pageofs;
1981                        len = tty_prepare_flip_string(&port->port, &dst,
1982                                        min(Page_size - pageofs, count));
1983                        memcpy_fromio(dst, ofs, len);
1984
1985                        count -= len;
1986                        pageofs = (pageofs + len) & Page_mask;
1987                        if (pageofs == 0 && ++pageno == epage)
1988                                pageno = spage;
1989                }
1990                head = (head + total) & rx_mask;
1991        }
1992        writew(head, ofsAddr + RXrptr);
1993        if (readb(ofsAddr + FlagStat) & Xoff_state) {
1994                moxaLowWaterChk = 1;
1995                port->lowChkFlag = 1;
1996        }
1997        return total;
1998}
1999
2000
2001static int MoxaPortTxQueue(struct moxa_port *port)
2002{
2003        void __iomem *ofsAddr = port->tableAddr;
2004        u16 rptr, wptr, mask;
2005
2006        rptr = readw(ofsAddr + TXrptr);
2007        wptr = readw(ofsAddr + TXwptr);
2008        mask = readw(ofsAddr + TX_mask);
2009        return (wptr - rptr) & mask;
2010}
2011
2012static int MoxaPortTxFree(struct moxa_port *port)
2013{
2014        void __iomem *ofsAddr = port->tableAddr;
2015        u16 rptr, wptr, mask;
2016
2017        rptr = readw(ofsAddr + TXrptr);
2018        wptr = readw(ofsAddr + TXwptr);
2019        mask = readw(ofsAddr + TX_mask);
2020        return mask - ((wptr - rptr) & mask);
2021}
2022
2023static int MoxaPortRxQueue(struct moxa_port *port)
2024{
2025        void __iomem *ofsAddr = port->tableAddr;
2026        u16 rptr, wptr, mask;
2027
2028        rptr = readw(ofsAddr + RXrptr);
2029        wptr = readw(ofsAddr + RXwptr);
2030        mask = readw(ofsAddr + RX_mask);
2031        return (wptr - rptr) & mask;
2032}
2033
2034static void MoxaPortTxDisable(struct moxa_port *port)
2035{
2036        moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2037}
2038
2039static void MoxaPortTxEnable(struct moxa_port *port)
2040{
2041        moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2042}
2043
2044static int moxa_get_serial_info(struct moxa_port *info,
2045                struct serial_struct __user *retinfo)
2046{
2047        struct serial_struct tmp = {
2048                .type = info->type,
2049                .line = info->port.tty->index,
2050                .flags = info->port.flags,
2051                .baud_base = 921600,
2052                .close_delay = info->port.close_delay
2053        };
2054        return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2055}
2056
2057
2058static int moxa_set_serial_info(struct moxa_port *info,
2059                struct serial_struct __user *new_info)
2060{
2061        struct serial_struct new_serial;
2062
2063        if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2064                return -EFAULT;
2065
2066        if (new_serial.irq != 0 || new_serial.port != 0 ||
2067                        new_serial.custom_divisor != 0 ||
2068                        new_serial.baud_base != 921600)
2069                return -EPERM;
2070
2071        if (!capable(CAP_SYS_ADMIN)) {
2072                if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2073                     (info->port.flags & ~ASYNC_USR_MASK)))
2074                        return -EPERM;
2075        } else
2076                info->port.close_delay = new_serial.close_delay * HZ / 100;
2077
2078        new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2079        new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2080
2081        MoxaSetFifo(info, new_serial.type == PORT_16550A);
2082
2083        info->type = new_serial.type;
2084        return 0;
2085}
2086
2087
2088
2089/*****************************************************************************
2090 *      Static local functions:                                              *
2091 *****************************************************************************/
2092
2093static void MoxaSetFifo(struct moxa_port *port, int enable)
2094{
2095        void __iomem *ofsAddr = port->tableAddr;
2096
2097        if (!enable) {
2098                moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2099                moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2100        } else {
2101                moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2102                moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2103        }
2104}
2105
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