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}