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                        tty_port_tty_hangup(&brd->ports[a].port, false);
 918
 919        for (a = 0; a < MAX_PORTS_PER_BOARD; a++)
 920                tty_port_destroy(&brd->ports[a].port);
 921
 922        while (1) {
 923                opened = 0;
 924                for (a = 0; a < brd->numPorts; a++)
 925                        if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
 926                                opened++;
 927                mutex_unlock(&moxa_openlock);
 928                if (!opened)
 929                        break;
 930                msleep(50);
 931                mutex_lock(&moxa_openlock);
 932        }
 933
 934        first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
 935        for (a = 0; a < brd->numPorts; a++)
 936                tty_unregister_device(moxaDriver, first_idx + a);
 937
 938        iounmap(brd->basemem);
 939        brd->basemem = NULL;
 940        kfree(brd->ports);
 941}
 942
 943#ifdef CONFIG_PCI
 944static int moxa_pci_probe(struct pci_dev *pdev,
 945                const struct pci_device_id *ent)
 946{
 947        struct moxa_board_conf *board;
 948        unsigned int i;
 949        int board_type = ent->driver_data;
 950        int retval;
 951
 952        retval = pci_enable_device(pdev);
 953        if (retval) {
 954                dev_err(&pdev->dev, "can't enable pci device\n");
 955                goto err;
 956        }
 957
 958        for (i = 0; i < MAX_BOARDS; i++)
 959                if (moxa_boards[i].basemem == NULL)
 960                        break;
 961
 962        retval = -ENODEV;
 963        if (i >= MAX_BOARDS) {
 964                dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
 965                                "found. Board is ignored.\n", MAX_BOARDS);
 966                goto err;
 967        }
 968
 969        board = &moxa_boards[i];
 970
 971        retval = pci_request_region(pdev, 2, "moxa-base");
 972        if (retval) {
 973                dev_err(&pdev->dev, "can't request pci region 2\n");
 974                goto err;
 975        }
 976
 977        board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
 978        if (board->basemem == NULL) {
 979                dev_err(&pdev->dev, "can't remap io space 2\n");
 980                retval = -ENOMEM;
 981                goto err_reg;
 982        }
 983
 984        board->boardType = board_type;
 985        switch (board_type) {
 986        case MOXA_BOARD_C218_ISA:
 987        case MOXA_BOARD_C218_PCI:
 988                board->numPorts = 8;
 989                break;
 990
 991        case MOXA_BOARD_CP204J:
 992                board->numPorts = 4;
 993                break;
 994        default:
 995                board->numPorts = 0;
 996                break;
 997        }
 998        board->busType = MOXA_BUS_TYPE_PCI;
 999
1000        retval = moxa_init_board(board, &pdev->dev);
1001        if (retval)
1002                goto err_base;
1003
1004        pci_set_drvdata(pdev, board);
1005
1006        dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
1007                        moxa_brdname[board_type - 1], board->numPorts);
1008
1009        return 0;
1010err_base:
1011        iounmap(board->basemem);
1012        board->basemem = NULL;
1013err_reg:
1014        pci_release_region(pdev, 2);
1015err:
1016        return retval;
1017}
1018
1019static void moxa_pci_remove(struct pci_dev *pdev)
1020{
1021        struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1022
1023        moxa_board_deinit(brd);
1024
1025        pci_release_region(pdev, 2);
1026}
1027
1028static struct pci_driver moxa_pci_driver = {
1029        .name = "moxa",
1030        .id_table = moxa_pcibrds,
1031        .probe = moxa_pci_probe,
1032        .remove = moxa_pci_remove
1033};
1034#endif /* CONFIG_PCI */
1035
1036static int __init moxa_init(void)
1037{
1038        unsigned int isabrds = 0;
1039        int retval = 0;
1040        struct moxa_board_conf *brd = moxa_boards;
1041        unsigned int i;
1042
1043        printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1044                        MOXA_VERSION);
1045
1046        tty_port_init(&moxa_service_port);
1047
1048        moxaDriver = tty_alloc_driver(MAX_PORTS + 1,
1049                        TTY_DRIVER_REAL_RAW |
1050                        TTY_DRIVER_DYNAMIC_DEV);
1051        if (IS_ERR(moxaDriver))
1052                return PTR_ERR(moxaDriver);
1053
1054        moxaDriver->name = "ttyMX";
1055        moxaDriver->major = ttymajor;
1056        moxaDriver->minor_start = 0;
1057        moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1058        moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1059        moxaDriver->init_termios = tty_std_termios;
1060        moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1061        moxaDriver->init_termios.c_ispeed = 9600;
1062        moxaDriver->init_termios.c_ospeed = 9600;
1063        tty_set_operations(moxaDriver, &moxa_ops);
1064        /* Having one more port only for ioctls is ugly */
1065        tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS);
1066
1067        if (tty_register_driver(moxaDriver)) {
1068                printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1069                put_tty_driver(moxaDriver);
1070                return -1;
1071        }
1072
1073        /* Find the boards defined from module args. */
1074
1075        for (i = 0; i < MAX_BOARDS; i++) {
1076                if (!baseaddr[i])
1077                        break;
1078                if (type[i] == MOXA_BOARD_C218_ISA ||
1079                                type[i] == MOXA_BOARD_C320_ISA) {
1080                        pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1081                                        isabrds + 1, moxa_brdname[type[i] - 1],
1082                                        baseaddr[i]);
1083                        brd->boardType = type[i];
1084                        brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1085                                        numports[i];
1086                        brd->busType = MOXA_BUS_TYPE_ISA;
1087                        brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1088                        if (!brd->basemem) {
1089                                printk(KERN_ERR "MOXA: can't remap %lx\n",
1090                                                baseaddr[i]);
1091                                continue;
1092                        }
1093                        if (moxa_init_board(brd, NULL)) {
1094                                iounmap(brd->basemem);
1095                                brd->basemem = NULL;
1096                                continue;
1097                        }
1098
1099                        printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1100                                        "ready (%u ports, firmware loaded)\n",
1101                                        baseaddr[i], brd->numPorts);
1102
1103                        brd++;
1104                        isabrds++;
1105                }
1106        }
1107
1108#ifdef CONFIG_PCI
1109        retval = pci_register_driver(&moxa_pci_driver);
1110        if (retval) {
1111                printk(KERN_ERR "Can't register MOXA pci driver!\n");
1112                if (isabrds)
1113                        retval = 0;
1114        }
1115#endif
1116
1117        return retval;
1118}
1119
1120static void __exit moxa_exit(void)
1121{
1122        unsigned int i;
1123
1124#ifdef CONFIG_PCI
1125        pci_unregister_driver(&moxa_pci_driver);
1126#endif
1127
1128        for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1129                if (moxa_boards[i].ready)
1130                        moxa_board_deinit(&moxa_boards[i]);
1131
1132        del_timer_sync(&moxaTimer);
1133
1134        if (tty_unregister_driver(moxaDriver))
1135                printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1136                                "serial driver\n");
1137        put_tty_driver(moxaDriver);
1138}
1139
1140module_init(moxa_init);
1141module_exit(moxa_exit);
1142
1143static void moxa_shutdown(struct tty_port *port)
1144{
1145        struct moxa_port *ch = container_of(port, struct moxa_port, port);
1146        MoxaPortDisable(ch);
1147        MoxaPortFlushData(ch, 2);
1148}
1149
1150static int moxa_carrier_raised(struct tty_port *port)
1151{
1152        struct moxa_port *ch = container_of(port, struct moxa_port, port);
1153        int dcd;
1154
1155        spin_lock_irq(&port->lock);
1156        dcd = ch->DCDState;
1157        spin_unlock_irq(&port->lock);
1158        return dcd;
1159}
1160
1161static void moxa_dtr_rts(struct tty_port *port, int onoff)
1162{
1163        struct moxa_port *ch = container_of(port, struct moxa_port, port);
1164        MoxaPortLineCtrl(ch, onoff, onoff);
1165}
1166
1167
1168static int moxa_open(struct tty_struct *tty, struct file *filp)
1169{
1170        struct moxa_board_conf *brd;
1171        struct moxa_port *ch;
1172        int port;
1173
1174        port = tty->index;
1175        if (port == MAX_PORTS) {
1176                return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1177        }
1178        if (mutex_lock_interruptible(&moxa_openlock))
1179                return -ERESTARTSYS;
1180        brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1181        if (!brd->ready) {
1182                mutex_unlock(&moxa_openlock);
1183                return -ENODEV;
1184        }
1185
1186        if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1187                mutex_unlock(&moxa_openlock);
1188                return -ENODEV;
1189        }
1190
1191        ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1192        ch->port.count++;
1193        tty->driver_data = ch;
1194        tty_port_tty_set(&ch->port, tty);
1195        mutex_lock(&ch->port.mutex);
1196        if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1197                ch->statusflags = 0;
1198                moxa_set_tty_param(tty, &tty->termios);
1199                MoxaPortLineCtrl(ch, 1, 1);
1200                MoxaPortEnable(ch);
1201                MoxaSetFifo(ch, ch->type == PORT_16550A);
1202                ch->port.flags |= ASYNC_INITIALIZED;
1203        }
1204        mutex_unlock(&ch->port.mutex);
1205        mutex_unlock(&moxa_openlock);
1206
1207        return tty_port_block_til_ready(&ch->port, tty, filp);
1208}
1209
1210static void moxa_close(struct tty_struct *tty, struct file *filp)
1211{
1212        struct moxa_port *ch = tty->driver_data;
1213        ch->cflag = tty->termios.c_cflag;
1214        tty_port_close(&ch->port, tty, filp);
1215}
1216
1217static int moxa_write(struct tty_struct *tty,
1218                      const unsigned char *buf, int count)
1219{
1220        struct moxa_port *ch = tty->driver_data;
1221        unsigned long flags;
1222        int len;
1223
1224        if (ch == NULL)
1225                return 0;
1226
1227        spin_lock_irqsave(&moxa_lock, flags);
1228        len = MoxaPortWriteData(tty, buf, count);
1229        spin_unlock_irqrestore(&moxa_lock, flags);
1230
1231        set_bit(LOWWAIT, &ch->statusflags);
1232        return len;
1233}
1234
1235static int moxa_write_room(struct tty_struct *tty)
1236{
1237        struct moxa_port *ch;
1238
1239        if (tty->stopped)
1240                return 0;
1241        ch = tty->driver_data;
1242        if (ch == NULL)
1243                return 0;
1244        return MoxaPortTxFree(ch);
1245}
1246
1247static void moxa_flush_buffer(struct tty_struct *tty)
1248{
1249        struct moxa_port *ch = tty->driver_data;
1250
1251        if (ch == NULL)
1252                return;
1253        MoxaPortFlushData(ch, 1);
1254        tty_wakeup(tty);
1255}
1256
1257static int moxa_chars_in_buffer(struct tty_struct *tty)
1258{
1259        struct moxa_port *ch = tty->driver_data;
1260        int chars;
1261
1262        chars = MoxaPortTxQueue(ch);
1263        if (chars)
1264                /*
1265                 * Make it possible to wakeup anything waiting for output
1266                 * in tty_ioctl.c, etc.
1267                 */
1268                set_bit(EMPTYWAIT, &ch->statusflags);
1269        return chars;
1270}
1271
1272static int moxa_tiocmget(struct tty_struct *tty)
1273{
1274        struct moxa_port *ch = tty->driver_data;
1275        int flag = 0, dtr, rts;
1276
1277        MoxaPortGetLineOut(ch, &dtr, &rts);
1278        if (dtr)
1279                flag |= TIOCM_DTR;
1280        if (rts)
1281                flag |= TIOCM_RTS;
1282        dtr = MoxaPortLineStatus(ch);
1283        if (dtr & 1)
1284                flag |= TIOCM_CTS;
1285        if (dtr & 2)
1286                flag |= TIOCM_DSR;
1287        if (dtr & 4)
1288                flag |= TIOCM_CD;
1289        return flag;
1290}
1291
1292static int moxa_tiocmset(struct tty_struct *tty,
1293                         unsigned int set, unsigned int clear)
1294{
1295        struct moxa_port *ch;
1296        int dtr, rts;
1297
1298        mutex_lock(&moxa_openlock);
1299        ch = tty->driver_data;
1300        if (!ch) {
1301                mutex_unlock(&moxa_openlock);
1302                return -EINVAL;
1303        }
1304
1305        MoxaPortGetLineOut(ch, &dtr, &rts);
1306        if (set & TIOCM_RTS)
1307                rts = 1;
1308        if (set & TIOCM_DTR)
1309                dtr = 1;
1310        if (clear & TIOCM_RTS)
1311                rts = 0;
1312        if (clear & TIOCM_DTR)
1313                dtr = 0;
1314        MoxaPortLineCtrl(ch, dtr, rts);
1315        mutex_unlock(&moxa_openlock);
1316        return 0;
1317}
1318
1319static void moxa_set_termios(struct tty_struct *tty,
1320                struct ktermios *old_termios)
1321{
1322        struct moxa_port *ch = tty->driver_data;
1323
1324        if (ch == NULL)
1325                return;
1326        moxa_set_tty_param(tty, old_termios);
1327        if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1328                wake_up_interruptible(&ch->port.open_wait);
1329}
1330
1331static void moxa_stop(struct tty_struct *tty)
1332{
1333        struct moxa_port *ch = tty->driver_data;
1334
1335        if (ch == NULL)
1336                return;
1337        MoxaPortTxDisable(ch);
1338        set_bit(TXSTOPPED, &ch->statusflags);
1339}
1340
1341
1342static void moxa_start(struct tty_struct *tty)
1343{
1344        struct moxa_port *ch = tty->driver_data;
1345
1346        if (ch == NULL)
1347                return;
1348
1349        if (!test_bit(TXSTOPPED, &ch->statusflags))
1350                return;
1351
1352        MoxaPortTxEnable(ch);
1353        clear_bit(TXSTOPPED, &ch->statusflags);
1354}
1355
1356static void moxa_hangup(struct tty_struct *tty)
1357{
1358        struct moxa_port *ch = tty->driver_data;
1359        tty_port_hangup(&ch->port);
1360}
1361
1362static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1363{
1364        unsigned long flags;
1365        dcd = !!dcd;
1366
1367        spin_lock_irqsave(&p->port.lock, flags);
1368        if (dcd != p->DCDState) {
1369                p->DCDState = dcd;
1370                spin_unlock_irqrestore(&p->port.lock, flags);
1371                if (!dcd)
1372                        tty_port_tty_hangup(&p->port, true);
1373        }
1374        else
1375                spin_unlock_irqrestore(&p->port.lock, flags);
1376}
1377
1378static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1379                u16 __iomem *ip)
1380{
1381        struct tty_struct *tty = tty_port_tty_get(&p->port);
1382        void __iomem *ofsAddr;
1383        unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1384        u16 intr;
1385
1386        if (tty) {
1387                if (test_bit(EMPTYWAIT, &p->statusflags) &&
1388                                MoxaPortTxQueue(p) == 0) {
1389                        clear_bit(EMPTYWAIT, &p->statusflags);
1390                        tty_wakeup(tty);
1391                }
1392                if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1393                                MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1394                        clear_bit(LOWWAIT, &p->statusflags);
1395                        tty_wakeup(tty);
1396                }
1397
1398                if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
1399                                MoxaPortRxQueue(p) > 0) { /* RX */
1400                        MoxaPortReadData(p);
1401                        tty_schedule_flip(&p->port);
1402                }
1403        } else {
1404                clear_bit(EMPTYWAIT, &p->statusflags);
1405                MoxaPortFlushData(p, 0); /* flush RX */
1406        }
1407
1408        if (!handle) /* nothing else to do */
1409                goto put;
1410
1411        intr = readw(ip); /* port irq status */
1412        if (intr == 0)
1413                goto put;
1414
1415        writew(0, ip); /* ACK port */
1416        ofsAddr = p->tableAddr;
1417        if (intr & IntrTx) /* disable tx intr */
1418                writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1419                                ofsAddr + HostStat);
1420
1421        if (!inited)
1422                goto put;
1423
1424        if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1425                tty_insert_flip_char(&p->port, 0, TTY_BREAK);
1426                tty_schedule_flip(&p->port);
1427        }
1428
1429        if (intr & IntrLine)
1430                moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1431put:
1432        tty_kref_put(tty);
1433
1434        return 0;
1435}
1436
1437static void moxa_poll(unsigned long ignored)
1438{
1439        struct moxa_board_conf *brd;
1440        u16 __iomem *ip;
1441        unsigned int card, port, served = 0;
1442
1443        spin_lock(&moxa_lock);
1444        for (card = 0; card < MAX_BOARDS; card++) {
1445                brd = &moxa_boards[card];
1446                if (!brd->ready)
1447                        continue;
1448
1449                served++;
1450
1451                ip = NULL;
1452                if (readb(brd->intPend) == 0xff)
1453                        ip = brd->intTable + readb(brd->intNdx);
1454
1455                for (port = 0; port < brd->numPorts; port++)
1456                        moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1457
1458                if (ip)
1459                        writeb(0, brd->intPend); /* ACK */
1460
1461                if (moxaLowWaterChk) {
1462                        struct moxa_port *p = brd->ports;
1463                        for (port = 0; port < brd->numPorts; port++, p++)
1464                                if (p->lowChkFlag) {
1465                                        p->lowChkFlag = 0;
1466                                        moxa_low_water_check(p->tableAddr);
1467                                }
1468                }
1469        }
1470        moxaLowWaterChk = 0;
1471
1472        if (served)
1473                mod_timer(&moxaTimer, jiffies + HZ / 50);
1474        spin_unlock(&moxa_lock);
1475}
1476
1477/******************************************************************************/
1478
1479static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1480{
1481        register struct ktermios *ts = &tty->termios;
1482        struct moxa_port *ch = tty->driver_data;
1483        int rts, cts, txflow, rxflow, xany, baud;
1484
1485        rts = cts = txflow = rxflow = xany = 0;
1486        if (ts->c_cflag & CRTSCTS)
1487                rts = cts = 1;
1488        if (ts->c_iflag & IXON)
1489                txflow = 1;
1490        if (ts->c_iflag & IXOFF)
1491                rxflow = 1;
1492        if (ts->c_iflag & IXANY)
1493                xany = 1;
1494
1495        /* Clear the features we don't support */
1496        ts->c_cflag &= ~CMSPAR;
1497        MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1498        baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1499        if (baud == -1)
1500                baud = tty_termios_baud_rate(old_termios);
1501        /* Not put the baud rate into the termios data */
1502        tty_encode_baud_rate(tty, baud, baud);
1503}
1504
1505/*****************************************************************************
1506 *      Driver level functions:                                              *
1507 *****************************************************************************/
1508
1509static void MoxaPortFlushData(struct moxa_port *port, int mode)
1510{
1511        void __iomem *ofsAddr;
1512        if (mode < 0 || mode > 2)
1513                return;
1514        ofsAddr = port->tableAddr;
1515        moxafunc(ofsAddr, FC_FlushQueue, mode);
1516        if (mode != 1) {
1517                port->lowChkFlag = 0;
1518                moxa_low_water_check(ofsAddr);
1519        }
1520}
1521
1522/*
1523 *    Moxa Port Number Description:
1524 *
1525 *      MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1526 *      the port number using in MOXA driver functions will be 0 to 31 for
1527 *      first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1528 *      to 127 for fourth. For example, if you setup three MOXA boards,
1529 *      first board is C218, second board is C320-16 and third board is
1530 *      C320-32. The port number of first board (C218 - 8 ports) is from
1531 *      0 to 7. The port number of second board (C320 - 16 ports) is form
1532 *      32 to 47. The port number of third board (C320 - 32 ports) is from
1533 *      64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1534 *      127 will be invalid.
1535 *
1536 *
1537 *      Moxa Functions Description:
1538 *
1539 *      Function 1:     Driver initialization routine, this routine must be
1540 *                      called when initialized driver.
1541 *      Syntax:
1542 *      void MoxaDriverInit();
1543 *
1544 *
1545 *      Function 2:     Moxa driver private IOCTL command processing.
1546 *      Syntax:
1547 *      int  MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1548 *
1549 *           unsigned int cmd   : IOCTL command
1550 *           unsigned long arg  : IOCTL argument
1551 *           int port           : port number (0 - 127)
1552 *
1553 *           return:    0  (OK)
1554 *                      -EINVAL
1555 *                      -ENOIOCTLCMD
1556 *
1557 *
1558 *      Function 6:     Enable this port to start Tx/Rx data.
1559 *      Syntax:
1560 *      void MoxaPortEnable(int port);
1561 *           int port           : port number (0 - 127)
1562 *
1563 *
1564 *      Function 7:     Disable this port
1565 *      Syntax:
1566 *      void MoxaPortDisable(int port);
1567 *           int port           : port number (0 - 127)
1568 *
1569 *
1570 *      Function 10:    Setting baud rate of this port.
1571 *      Syntax:
1572 *      speed_t MoxaPortSetBaud(int port, speed_t baud);
1573 *           int port           : port number (0 - 127)
1574 *           long baud          : baud rate (50 - 115200)
1575 *
1576 *           return:    0       : this port is invalid or baud < 50
1577 *                      50 - 115200 : the real baud rate set to the port, if
1578 *                                    the argument baud is large than maximun
1579 *                                    available baud rate, the real setting
1580 *                                    baud rate will be the maximun baud rate.
1581 *
1582 *
1583 *      Function 12:    Configure the port.
1584 *      Syntax:
1585 *      int  MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1586 *           int port           : port number (0 - 127)
1587 *           struct ktermios * termio : termio structure pointer
1588 *           speed_t baud       : baud rate
1589 *
1590 *           return:    -1      : this port is invalid or termio == NULL
1591 *                      0       : setting O.K.
1592 *
1593 *
1594 *      Function 13:    Get the DTR/RTS state of this port.
1595 *      Syntax:
1596 *      int  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1597 *           int port           : port number (0 - 127)
1598 *           int * dtrState     : pointer to INT to receive the current DTR
1599 *                                state. (if NULL, this function will not
1600 *                                write to this address)
1601 *           int * rtsState     : pointer to INT to receive the current RTS
1602 *                                state. (if NULL, this function will not
1603 *                                write to this address)
1604 *
1605 *           return:    -1      : this port is invalid
1606 *                      0       : O.K.
1607 *
1608 *
1609 *      Function 14:    Setting the DTR/RTS output state of this port.
1610 *      Syntax:
1611 *      void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1612 *           int port           : port number (0 - 127)
1613 *           int dtrState       : DTR output state (0: off, 1: on)
1614 *           int rtsState       : RTS output state (0: off, 1: on)
1615 *
1616 *
1617 *      Function 15:    Setting the flow control of this port.
1618 *      Syntax:
1619 *      void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1620 *                            int txFlow,int xany);
1621 *           int port           : port number (0 - 127)
1622 *           int rtsFlow        : H/W RTS flow control (0: no, 1: yes)
1623 *           int ctsFlow        : H/W CTS flow control (0: no, 1: yes)
1624 *           int rxFlow         : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1625 *           int txFlow         : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1626 *           int xany           : S/W XANY flow control (0: no, 1: yes)
1627 *
1628 *
1629 *      Function 16:    Get ths line status of this port
1630 *      Syntax:
1631 *      int  MoxaPortLineStatus(int port);
1632 *           int port           : port number (0 - 127)
1633 *
1634 *           return:    Bit 0 - CTS state (0: off, 1: on)
1635 *                      Bit 1 - DSR state (0: off, 1: on)
1636 *                      Bit 2 - DCD state (0: off, 1: on)
1637 *
1638 *
1639 *      Function 19:    Flush the Rx/Tx buffer data of this port.
1640 *      Syntax:
1641 *      void MoxaPortFlushData(int port, int mode);
1642 *           int port           : port number (0 - 127)
1643 *           int mode    
1644 *                      0       : flush the Rx buffer 
1645 *                      1       : flush the Tx buffer 
1646 *                      2       : flush the Rx and Tx buffer 
1647 *
1648 *
1649 *      Function 20:    Write data.
1650 *      Syntax:
1651 *      int  MoxaPortWriteData(int port, unsigned char * buffer, int length);
1652 *           int port           : port number (0 - 127)
1653 *           unsigned char * buffer     : pointer to write data buffer.
1654 *           int length         : write data length
1655 *
1656 *           return:    0 - length      : real write data length
1657 *
1658 *
1659 *      Function 21:    Read data.
1660 *      Syntax:
1661 *      int  MoxaPortReadData(int port, struct tty_struct *tty);
1662 *           int port           : port number (0 - 127)
1663 *           struct tty_struct *tty : tty for data
1664 *
1665 *           return:    0 - length      : real read data length
1666 *
1667 *
1668 *      Function 24:    Get the Tx buffer current queued data bytes
1669 *      Syntax:
1670 *      int  MoxaPortTxQueue(int port);
1671 *           int port           : port number (0 - 127)
1672 *
1673 *           return:    ..      : Tx buffer current queued data bytes
1674 *
1675 *
1676 *      Function 25:    Get the Tx buffer current free space
1677 *      Syntax:
1678 *      int  MoxaPortTxFree(int port);
1679 *           int port           : port number (0 - 127)
1680 *
1681 *           return:    ..      : Tx buffer current free space
1682 *
1683 *
1684 *      Function 26:    Get the Rx buffer current queued data bytes
1685 *      Syntax:
1686 *      int  MoxaPortRxQueue(int port);
1687 *           int port           : port number (0 - 127)
1688 *
1689 *           return:    ..      : Rx buffer current queued data bytes
1690 *
1691 *
1692 *      Function 28:    Disable port data transmission.
1693 *      Syntax:
1694 *      void MoxaPortTxDisable(int port);
1695 *           int port           : port number (0 - 127)
1696 *
1697 *
1698 *      Function 29:    Enable port data transmission.
1699 *      Syntax:
1700 *      void MoxaPortTxEnable(int port);
1701 *           int port           : port number (0 - 127)
1702 *
1703 *
1704 *      Function 31:    Get the received BREAK signal count and reset it.
1705 *      Syntax:
1706 *      int  MoxaPortResetBrkCnt(int port);
1707 *           int port           : port number (0 - 127)
1708 *
1709 *           return:    0 - ..  : BREAK signal count
1710 *
1711 *
1712 */
1713
1714static void MoxaPortEnable(struct moxa_port *port)
1715{
1716        void __iomem *ofsAddr;
1717        u16 lowwater = 512;
1718
1719        ofsAddr = port->tableAddr;
1720        writew(lowwater, ofsAddr + Low_water);
1721        if (MOXA_IS_320(port->board))
1722                moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1723        else
1724                writew(readw(ofsAddr + HostStat) | WakeupBreak,
1725                                ofsAddr + HostStat);
1726
1727        moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1728        moxafunc(ofsAddr, FC_FlushQueue, 2);
1729
1730        moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1731        MoxaPortLineStatus(port);
1732}
1733
1734static void MoxaPortDisable(struct moxa_port *port)
1735{
1736        void __iomem *ofsAddr = port->tableAddr;
1737
1738        moxafunc(ofsAddr, FC_SetFlowCtl, 0);    /* disable flow control */
1739        moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1740        writew(0, ofsAddr + HostStat);
1741        moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1742}
1743
1744static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1745{
1746        void __iomem *ofsAddr = port->tableAddr;
1747        unsigned int clock, val;
1748        speed_t max;
1749
1750        max = MOXA_IS_320(port->board) ? 460800 : 921600;
1751        if (baud < 50)
1752                return 0;
1753        if (baud > max)
1754                baud = max;
1755        clock = 921600;
1756        val = clock / baud;
1757        moxafunc(ofsAddr, FC_SetBaud, val);
1758        baud = clock / val;
1759        return baud;
1760}
1761
1762static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1763                speed_t baud)
1764{
1765        void __iomem *ofsAddr;
1766        tcflag_t mode = 0;
1767
1768        ofsAddr = port->tableAddr;
1769
1770        mode = termio->c_cflag & CSIZE;
1771        if (mode == CS5)
1772                mode = MX_CS5;
1773        else if (mode == CS6)
1774                mode = MX_CS6;
1775        else if (mode == CS7)
1776                mode = MX_CS7;
1777        else if (mode == CS8)
1778                mode = MX_CS8;
1779
1780        if (termio->c_cflag & CSTOPB) {
1781                if (mode == MX_CS5)
1782                        mode |= MX_STOP15;
1783                else
1784                        mode |= MX_STOP2;
1785        } else
1786                mode |= MX_STOP1;
1787
1788        if (termio->c_cflag & PARENB) {
1789                if (termio->c_cflag & PARODD)
1790                        mode |= MX_PARODD;
1791                else
1792                        mode |= MX_PAREVEN;
1793        } else
1794                mode |= MX_PARNONE;
1795
1796        moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1797
1798        if (MOXA_IS_320(port->board) && baud >= 921600)
1799                return -1;
1800
1801        baud = MoxaPortSetBaud(port, baud);
1802
1803        if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1804                spin_lock_irq(&moxafunc_lock);
1805                writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1806                writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1807                writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1808                moxa_wait_finish(ofsAddr);
1809                spin_unlock_irq(&moxafunc_lock);
1810
1811        }
1812        return baud;
1813}
1814
1815static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1816                int *rtsState)
1817{
1818        if (dtrState)
1819                *dtrState = !!(port->lineCtrl & DTR_ON);
1820        if (rtsState)
1821                *rtsState = !!(port->lineCtrl & RTS_ON);
1822
1823        return 0;
1824}
1825
1826static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1827{
1828        u8 mode = 0;
1829
1830        if (dtr)
1831                mode |= DTR_ON;
1832        if (rts)
1833                mode |= RTS_ON;
1834        port->lineCtrl = mode;
1835        moxafunc(port->tableAddr, FC_LineControl, mode);
1836}
1837
1838static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1839                int txflow, int rxflow, int txany)
1840{
1841        int mode = 0;
1842
1843        if (rts)
1844                mode |= RTS_FlowCtl;
1845        if (cts)
1846                mode |= CTS_FlowCtl;
1847        if (txflow)
1848                mode |= Tx_FlowCtl;
1849        if (rxflow)
1850                mode |= Rx_FlowCtl;
1851        if (txany)
1852                mode |= IXM_IXANY;
1853        moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1854}
1855
1856static int MoxaPortLineStatus(struct moxa_port *port)
1857{
1858        void __iomem *ofsAddr;
1859        int val;
1860
1861        ofsAddr = port->tableAddr;
1862        if (MOXA_IS_320(port->board))
1863                val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1864        else
1865                val = readw(ofsAddr + FlagStat) >> 4;
1866        val &= 0x0B;
1867        if (val & 8)
1868                val |= 4;
1869        moxa_new_dcdstate(port, val & 8);
1870        val &= 7;
1871        return val;
1872}
1873
1874static int MoxaPortWriteData(struct tty_struct *tty,
1875                const unsigned char *buffer, int len)
1876{
1877        struct moxa_port *port = tty->driver_data;
1878        void __iomem *baseAddr, *ofsAddr, *ofs;
1879        unsigned int c, total;
1880        u16 head, tail, tx_mask, spage, epage;
1881        u16 pageno, pageofs, bufhead;
1882
1883        ofsAddr = port->tableAddr;
1884        baseAddr = port->board->basemem;
1885        tx_mask = readw(ofsAddr + TX_mask);
1886        spage = readw(ofsAddr + Page_txb);
1887        epage = readw(ofsAddr + EndPage_txb);
1888        tail = readw(ofsAddr + TXwptr);
1889        head = readw(ofsAddr + TXrptr);
1890        c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1891        if (c > len)
1892                c = len;
1893        moxaLog.txcnt[port->port.tty->index] += c;
1894        total = c;
1895        if (spage == epage) {
1896                bufhead = readw(ofsAddr + Ofs_txb);
1897                writew(spage, baseAddr + Control_reg);
1898                while (c > 0) {
1899                        if (head > tail)
1900                                len = head - tail - 1;
1901                        else
1902                                len = tx_mask + 1 - tail;
1903                        len = (c > len) ? len : c;
1904                        ofs = baseAddr + DynPage_addr + bufhead + tail;
1905                        memcpy_toio(ofs, buffer, len);
1906                        buffer += len;
1907                        tail = (tail + len) & tx_mask;
1908                        c -= len;
1909                }
1910        } else {
1911                pageno = spage + (tail >> 13);
1912                pageofs = tail & Page_mask;
1913                while (c > 0) {
1914                        len = Page_size - pageofs;
1915                        if (len > c)
1916                                len = c;
1917                        writeb(pageno, baseAddr + Control_reg);
1918                        ofs = baseAddr + DynPage_addr + pageofs;
1919                        memcpy_toio(ofs, buffer, len);
1920                        buffer += len;
1921                        if (++pageno == epage)
1922                                pageno = spage;
1923                        pageofs = 0;
1924                        c -= len;
1925                }
1926                tail = (tail + total) & tx_mask;
1927        }
1928        writew(tail, ofsAddr + TXwptr);
1929        writeb(1, ofsAddr + CD180TXirq);        /* start to send */
1930        return total;
1931}
1932
1933static int MoxaPortReadData(struct moxa_port *port)
1934{
1935        struct tty_struct *tty = port->port.tty;
1936        unsigned char *dst;
1937        void __iomem *baseAddr, *ofsAddr, *ofs;
1938        unsigned int count, len, total;
1939        u16 tail, rx_mask, spage, epage;
1940        u16 pageno, pageofs, bufhead, head;
1941
1942        ofsAddr = port->tableAddr;
1943        baseAddr = port->board->basemem;
1944        head = readw(ofsAddr + RXrptr);
1945        tail = readw(ofsAddr + RXwptr);
1946        rx_mask = readw(ofsAddr + RX_mask);
1947        spage = readw(ofsAddr + Page_rxb);
1948        epage = readw(ofsAddr + EndPage_rxb);
1949        count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1950        if (count == 0)
1951                return 0;
1952
1953        total = count;
1954        moxaLog.rxcnt[tty->index] += total;
1955        if (spage == epage) {
1956                bufhead = readw(ofsAddr + Ofs_rxb);
1957                writew(spage, baseAddr + Control_reg);
1958                while (count > 0) {
1959                        ofs = baseAddr + DynPage_addr + bufhead + head;
1960                        len = (tail >= head) ? (tail - head) :
1961                                        (rx_mask + 1 - head);
1962                        len = tty_prepare_flip_string(&port->port, &dst,
1963                                        min(len, count));
1964                        memcpy_fromio(dst, ofs, len);
1965                        head = (head + len) & rx_mask;
1966                        count -= len;
1967                }
1968        } else {
1969                pageno = spage + (head >> 13);
1970                pageofs = head & Page_mask;
1971                while (count > 0) {
1972                        writew(pageno, baseAddr + Control_reg);
1973                        ofs = baseAddr + DynPage_addr + pageofs;
1974                        len = tty_prepare_flip_string(&port->port, &dst,
1975                                        min(Page_size - pageofs, count));
1976                        memcpy_fromio(dst, ofs, len);
1977
1978                        count -= len;
1979                        pageofs = (pageofs + len) & Page_mask;
1980                        if (pageofs == 0 && ++pageno == epage)
1981                                pageno = spage;
1982                }
1983                head = (head + total) & rx_mask;
1984        }
1985        writew(head, ofsAddr + RXrptr);
1986        if (readb(ofsAddr + FlagStat) & Xoff_state) {
1987                moxaLowWaterChk = 1;
1988                port->lowChkFlag = 1;
1989        }
1990        return total;
1991}
1992
1993
1994static int MoxaPortTxQueue(struct moxa_port *port)
1995{
1996        void __iomem *ofsAddr = port->tableAddr;
1997        u16 rptr, wptr, mask;
1998
1999        rptr = readw(ofsAddr + TXrptr);
2000        wptr = readw(ofsAddr + TXwptr);
2001        mask = readw(ofsAddr + TX_mask);
2002        return (wptr - rptr) & mask;
2003}
2004
2005static int MoxaPortTxFree(struct moxa_port *port)
2006{
2007        void __iomem *ofsAddr = port->tableAddr;
2008        u16 rptr, wptr, mask;
2009
2010        rptr = readw(ofsAddr + TXrptr);
2011        wptr = readw(ofsAddr + TXwptr);
2012        mask = readw(ofsAddr + TX_mask);
2013        return mask - ((wptr - rptr) & mask);
2014}
2015
2016static int MoxaPortRxQueue(struct moxa_port *port)
2017{
2018        void __iomem *ofsAddr = port->tableAddr;
2019        u16 rptr, wptr, mask;
2020
2021        rptr = readw(ofsAddr + RXrptr);
2022        wptr = readw(ofsAddr + RXwptr);
2023        mask = readw(ofsAddr + RX_mask);
2024        return (wptr - rptr) & mask;
2025}
2026
2027static void MoxaPortTxDisable(struct moxa_port *port)
2028{
2029        moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2030}
2031
2032static void MoxaPortTxEnable(struct moxa_port *port)
2033{
2034        moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2035}
2036
2037static int moxa_get_serial_info(struct moxa_port *info,
2038                struct serial_struct __user *retinfo)
2039{
2040        struct serial_struct tmp = {
2041                .type = info->type,
2042                .line = info->port.tty->index,
2043                .flags = info->port.flags,
2044                .baud_base = 921600,
2045                .close_delay = info->port.close_delay
2046        };
2047        return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2048}
2049
2050
2051static int moxa_set_serial_info(struct moxa_port *info,
2052                struct serial_struct __user *new_info)
2053{
2054        struct serial_struct new_serial;
2055
2056        if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2057                return -EFAULT;
2058
2059        if (new_serial.irq != 0 || new_serial.port != 0 ||
2060                        new_serial.custom_divisor != 0 ||
2061                        new_serial.baud_base != 921600)
2062                return -EPERM;
2063
2064        if (!capable(CAP_SYS_ADMIN)) {
2065                if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2066                     (info->port.flags & ~ASYNC_USR_MASK)))
2067                        return -EPERM;
2068        } else
2069                info->port.close_delay = new_serial.close_delay * HZ / 100;
2070
2071        new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2072        new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2073
2074        MoxaSetFifo(info, new_serial.type == PORT_16550A);
2075
2076        info->type = new_serial.type;
2077        return 0;
2078}
2079
2080
2081
2082/*****************************************************************************
2083 *      Static local functions:                                              *
2084 *****************************************************************************/
2085
2086static void MoxaSetFifo(struct moxa_port *port, int enable)
2087{
2088        void __iomem *ofsAddr = port->tableAddr;
2089
2090        if (!enable) {
2091                moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2092                moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2093        } else {
2094                moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2095                moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2096        }
2097}
2098
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