Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 2097 insertions, 0 deletions

diff --git a/kernel/drivers/tty/moxa.c b/kernel/drivers/tty/moxa.c
new file mode 100644
index 000000000..14c54e041
--- /dev/null
+++ b/kernel/drivers/tty/moxa.c
@@ -0,0 +1,2097 @@
+/*****************************************************************************/
+/*
+ *           moxa.c  -- MOXA Intellio family multiport serial driver.
+ *
+ *      Copyright (C) 1999-2000  Moxa Technologies (support@moxa.com).
+ *      Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
+ *
+ *      This code is loosely based on the Linux serial driver, written by
+ *      Linus Torvalds, Theodore T'so and others.
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ */
+
+/*
+ *    MOXA Intellio Series Driver
+ *      for             : LINUX
+ *      date            : 1999/1/7
+ *      version         : 5.1
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/firmware.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/serial.h>
+#include <linux/tty_driver.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/ratelimit.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include "moxa.h"
+
+#define MOXA_VERSION		"6.0k"
+
+#define MOXA_FW_HDRLEN		32
+
+#define MOXAMAJOR		172
+
+#define MAX_BOARDS		4	/* Don't change this value */
+#define MAX_PORTS_PER_BOARD	32	/* Don't change this value */
+#define MAX_PORTS		(MAX_BOARDS * MAX_PORTS_PER_BOARD)
+
+#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
+		(brd)->boardType == MOXA_BOARD_C320_PCI)
+
+/*
+ *    Define the Moxa PCI vendor and device IDs.
+ */
+#define MOXA_BUS_TYPE_ISA	0
+#define MOXA_BUS_TYPE_PCI	1
+
+enum {
+	MOXA_BOARD_C218_PCI = 1,
+	MOXA_BOARD_C218_ISA,
+	MOXA_BOARD_C320_PCI,
+	MOXA_BOARD_C320_ISA,
+	MOXA_BOARD_CP204J,
+};
+
+static char *moxa_brdname[] =
+{
+	"C218 Turbo PCI series",
+	"C218 Turbo ISA series",
+	"C320 Turbo PCI series",
+	"C320 Turbo ISA series",
+	"CP-204J series",
+};
+
+#ifdef CONFIG_PCI
+static struct pci_device_id moxa_pcibrds[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
+		.driver_data = MOXA_BOARD_C218_PCI },
+	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
+		.driver_data = MOXA_BOARD_C320_PCI },
+	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
+		.driver_data = MOXA_BOARD_CP204J },
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
+#endif /* CONFIG_PCI */
+
+struct moxa_port;
+
+static struct moxa_board_conf {
+	int boardType;
+	int numPorts;
+	int busType;
+
+	unsigned int ready;
+
+	struct moxa_port *ports;
+
+	void __iomem *basemem;
+	void __iomem *intNdx;
+	void __iomem *intPend;
+	void __iomem *intTable;
+} moxa_boards[MAX_BOARDS];
+
+struct mxser_mstatus {
+	tcflag_t cflag;
+	int cts;
+	int dsr;
+	int ri;
+	int dcd;
+};
+
+struct moxaq_str {
+	int inq;
+	int outq;
+};
+
+struct moxa_port {
+	struct tty_port port;
+	struct moxa_board_conf *board;
+	void __iomem *tableAddr;
+
+	int type;
+	int cflag;
+	unsigned long statusflags;
+
+	u8 DCDState;		/* Protected by the port lock */
+	u8 lineCtrl;
+	u8 lowChkFlag;
+};
+
+struct mon_str {
+	int tick;
+	int rxcnt[MAX_PORTS];
+	int txcnt[MAX_PORTS];
+};
+
+/* statusflags */
+#define TXSTOPPED	1
+#define LOWWAIT 	2
+#define EMPTYWAIT	3
+
+#define SERIAL_DO_RESTART
+
+#define WAKEUP_CHARS		256
+
+static int ttymajor = MOXAMAJOR;
+static struct mon_str moxaLog;
+static unsigned int moxaFuncTout = HZ / 2;
+static unsigned int moxaLowWaterChk;
+static DEFINE_MUTEX(moxa_openlock);
+static DEFINE_SPINLOCK(moxa_lock);
+
+static unsigned long baseaddr[MAX_BOARDS];
+static unsigned int type[MAX_BOARDS];
+static unsigned int numports[MAX_BOARDS];
+static struct tty_port moxa_service_port;
+
+MODULE_AUTHOR("William Chen");
+MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("c218tunx.cod");
+MODULE_FIRMWARE("cp204unx.cod");
+MODULE_FIRMWARE("c320tunx.cod");
+
+module_param_array(type, uint, NULL, 0);
+MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
+module_param_array(baseaddr, ulong, NULL, 0);
+MODULE_PARM_DESC(baseaddr, "base address");
+module_param_array(numports, uint, NULL, 0);
+MODULE_PARM_DESC(numports, "numports (ignored for C218)");
+
+module_param(ttymajor, int, 0);
+
+/*
+ * static functions:
+ */
+static int moxa_open(struct tty_struct *, struct file *);
+static void moxa_close(struct tty_struct *, struct file *);
+static int moxa_write(struct tty_struct *, const unsigned char *, int);
+static int moxa_write_room(struct tty_struct *);
+static void moxa_flush_buffer(struct tty_struct *);
+static int moxa_chars_in_buffer(struct tty_struct *);
+static void moxa_set_termios(struct tty_struct *, struct ktermios *);
+static void moxa_stop(struct tty_struct *);
+static void moxa_start(struct tty_struct *);
+static void moxa_hangup(struct tty_struct *);
+static int moxa_tiocmget(struct tty_struct *tty);
+static int moxa_tiocmset(struct tty_struct *tty,
+			 unsigned int set, unsigned int clear);
+static void moxa_poll(unsigned long);
+static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
+static void moxa_shutdown(struct tty_port *);
+static int moxa_carrier_raised(struct tty_port *);
+static void moxa_dtr_rts(struct tty_port *, int);
+/*
+ * moxa board interface functions:
+ */
+static void MoxaPortEnable(struct moxa_port *);
+static void MoxaPortDisable(struct moxa_port *);
+static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
+static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
+static void MoxaPortLineCtrl(struct moxa_port *, int, int);
+static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
+static int MoxaPortLineStatus(struct moxa_port *);
+static void MoxaPortFlushData(struct moxa_port *, int);
+static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
+static int MoxaPortReadData(struct moxa_port *);
+static int MoxaPortTxQueue(struct moxa_port *);
+static int MoxaPortRxQueue(struct moxa_port *);
+static int MoxaPortTxFree(struct moxa_port *);
+static void MoxaPortTxDisable(struct moxa_port *);
+static void MoxaPortTxEnable(struct moxa_port *);
+static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
+static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
+static void MoxaSetFifo(struct moxa_port *port, int enable);
+
+/*
+ * I/O functions
+ */
+
+static DEFINE_SPINLOCK(moxafunc_lock);
+
+static void moxa_wait_finish(void __iomem *ofsAddr)
+{
+	unsigned long end = jiffies + moxaFuncTout;
+
+	while (readw(ofsAddr + FuncCode) != 0)
+		if (time_after(jiffies, end))
+			return;
+	if (readw(ofsAddr + FuncCode) != 0)
+		printk_ratelimited(KERN_WARNING "moxa function expired\n");
+}
+
+static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&moxafunc_lock, flags);
+	writew(arg, ofsAddr + FuncArg);
+	writew(cmd, ofsAddr + FuncCode);
+	moxa_wait_finish(ofsAddr);
+	spin_unlock_irqrestore(&moxafunc_lock, flags);
+}
+
+static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
+{
+        unsigned long flags;
+        u16 ret;
+        spin_lock_irqsave(&moxafunc_lock, flags);
+	writew(arg, ofsAddr + FuncArg);
+	writew(cmd, ofsAddr + FuncCode);
+	moxa_wait_finish(ofsAddr);
+	ret = readw(ofsAddr + FuncArg);
+	spin_unlock_irqrestore(&moxafunc_lock, flags);
+	return ret;
+}
+
+static void moxa_low_water_check(void __iomem *ofsAddr)
+{
+	u16 rptr, wptr, mask, len;
+
+	if (readb(ofsAddr + FlagStat) & Xoff_state) {
+		rptr = readw(ofsAddr + RXrptr);
+		wptr = readw(ofsAddr + RXwptr);
+		mask = readw(ofsAddr + RX_mask);
+		len = (wptr - rptr) & mask;
+		if (len <= Low_water)
+			moxafunc(ofsAddr, FC_SendXon, 0);
+	}
+}
+
+/*
+ * TTY operations
+ */
+
+static int moxa_ioctl(struct tty_struct *tty,
+		      unsigned int cmd, unsigned long arg)
+{
+	struct moxa_port *ch = tty->driver_data;
+	void __user *argp = (void __user *)arg;
+	int status, ret = 0;
+
+	if (tty->index == MAX_PORTS) {
+		if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
+				cmd != MOXA_GETMSTATUS)
+			return -EINVAL;
+	} else if (!ch)
+		return -ENODEV;
+
+	switch (cmd) {
+	case MOXA_GETDATACOUNT:
+		moxaLog.tick = jiffies;
+		if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
+			ret = -EFAULT;
+		break;
+	case MOXA_FLUSH_QUEUE:
+		MoxaPortFlushData(ch, arg);
+		break;
+	case MOXA_GET_IOQUEUE: {
+		struct moxaq_str __user *argm = argp;
+		struct moxaq_str tmp;
+		struct moxa_port *p;
+		unsigned int i, j;
+
+		for (i = 0; i < MAX_BOARDS; i++) {
+			p = moxa_boards[i].ports;
+			for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
+				memset(&tmp, 0, sizeof(tmp));
+				spin_lock_bh(&moxa_lock);
+				if (moxa_boards[i].ready) {
+					tmp.inq = MoxaPortRxQueue(p);
+					tmp.outq = MoxaPortTxQueue(p);
+				}
+				spin_unlock_bh(&moxa_lock);
+				if (copy_to_user(argm, &tmp, sizeof(tmp)))
+					return -EFAULT;
+			}
+		}
+		break;
+	} case MOXA_GET_OQUEUE:
+		status = MoxaPortTxQueue(ch);
+		ret = put_user(status, (unsigned long __user *)argp);
+		break;
+	case MOXA_GET_IQUEUE:
+		status = MoxaPortRxQueue(ch);
+		ret = put_user(status, (unsigned long __user *)argp);
+		break;
+	case MOXA_GETMSTATUS: {
+		struct mxser_mstatus __user *argm = argp;
+		struct mxser_mstatus tmp;
+		struct moxa_port *p;
+		unsigned int i, j;
+
+		for (i = 0; i < MAX_BOARDS; i++) {
+			p = moxa_boards[i].ports;
+			for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
+				struct tty_struct *ttyp;
+				memset(&tmp, 0, sizeof(tmp));
+				spin_lock_bh(&moxa_lock);
+				if (!moxa_boards[i].ready) {
+				        spin_unlock_bh(&moxa_lock);
+					goto copy;
+                                }
+
+				status = MoxaPortLineStatus(p);
+				spin_unlock_bh(&moxa_lock);
+
+				if (status & 1)
+					tmp.cts = 1;
+				if (status & 2)
+					tmp.dsr = 1;
+				if (status & 4)
+					tmp.dcd = 1;
+
+				ttyp = tty_port_tty_get(&p->port);
+				if (!ttyp)
+					tmp.cflag = p->cflag;
+				else
+					tmp.cflag = ttyp->termios.c_cflag;
+				tty_kref_put(ttyp);
+copy:
+				if (copy_to_user(argm, &tmp, sizeof(tmp)))
+					return -EFAULT;
+			}
+		}
+		break;
+	}
+	case TIOCGSERIAL:
+	        mutex_lock(&ch->port.mutex);
+		ret = moxa_get_serial_info(ch, argp);
+		mutex_unlock(&ch->port.mutex);
+		break;
+	case TIOCSSERIAL:
+	        mutex_lock(&ch->port.mutex);
+		ret = moxa_set_serial_info(ch, argp);
+		mutex_unlock(&ch->port.mutex);
+		break;
+	default:
+		ret = -ENOIOCTLCMD;
+	}
+	return ret;
+}
+
+static int moxa_break_ctl(struct tty_struct *tty, int state)
+{
+	struct moxa_port *port = tty->driver_data;
+
+	moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
+			Magic_code);
+	return 0;
+}
+
+static const struct tty_operations moxa_ops = {
+	.open = moxa_open,
+	.close = moxa_close,
+	.write = moxa_write,
+	.write_room = moxa_write_room,
+	.flush_buffer = moxa_flush_buffer,
+	.chars_in_buffer = moxa_chars_in_buffer,
+	.ioctl = moxa_ioctl,
+	.set_termios = moxa_set_termios,
+	.stop = moxa_stop,
+	.start = moxa_start,
+	.hangup = moxa_hangup,
+	.break_ctl = moxa_break_ctl,
+	.tiocmget = moxa_tiocmget,
+	.tiocmset = moxa_tiocmset,
+};
+
+static const struct tty_port_operations moxa_port_ops = {
+	.carrier_raised = moxa_carrier_raised,
+	.dtr_rts = moxa_dtr_rts,
+	.shutdown = moxa_shutdown,
+};
+
+static struct tty_driver *moxaDriver;
+static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
+
+/*
+ * HW init
+ */
+
+static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
+{
+	switch (brd->boardType) {
+	case MOXA_BOARD_C218_ISA:
+	case MOXA_BOARD_C218_PCI:
+		if (model != 1)
+			goto err;
+		break;
+	case MOXA_BOARD_CP204J:
+		if (model != 3)
+			goto err;
+		break;
+	default:
+		if (model != 2)
+			goto err;
+		break;
+	}
+	return 0;
+err:
+	return -EINVAL;
+}
+
+static int moxa_check_fw(const void *ptr)
+{
+	const __le16 *lptr = ptr;
+
+	if (*lptr != cpu_to_le16(0x7980))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
+		size_t len)
+{
+	void __iomem *baseAddr = brd->basemem;
+	u16 tmp;
+
+	writeb(HW_reset, baseAddr + Control_reg);	/* reset */
+	msleep(10);
+	memset_io(baseAddr, 0, 4096);
+	memcpy_toio(baseAddr, buf, len);	/* download BIOS */
+	writeb(0, baseAddr + Control_reg);	/* restart */
+
+	msleep(2000);
+
+	switch (brd->boardType) {
+	case MOXA_BOARD_C218_ISA:
+	case MOXA_BOARD_C218_PCI:
+		tmp = readw(baseAddr + C218_key);
+		if (tmp != C218_KeyCode)
+			goto err;
+		break;
+	case MOXA_BOARD_CP204J:
+		tmp = readw(baseAddr + C218_key);
+		if (tmp != CP204J_KeyCode)
+			goto err;
+		break;
+	default:
+		tmp = readw(baseAddr + C320_key);
+		if (tmp != C320_KeyCode)
+			goto err;
+		tmp = readw(baseAddr + C320_status);
+		if (tmp != STS_init) {
+			printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
+					"module not found\n");
+			return -EIO;
+		}
+		break;
+	}
+
+	return 0;
+err:
+	printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
+	return -EIO;
+}
+
+static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
+		size_t len)
+{
+	void __iomem *baseAddr = brd->basemem;
+
+	if (len < 7168) {
+		printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
+		return -EINVAL;
+	}
+
+	writew(len - 7168 - 2, baseAddr + C320bapi_len);
+	writeb(1, baseAddr + Control_reg);	/* Select Page 1 */
+	memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
+	writeb(2, baseAddr + Control_reg);	/* Select Page 2 */
+	memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
+
+	return 0;
+}
+
+static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
+		size_t len)
+{
+	void __iomem *baseAddr = brd->basemem;
+	const __le16 *uptr = ptr;
+	size_t wlen, len2, j;
+	unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
+	unsigned int i, retry;
+	u16 usum, keycode;
+
+	keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
+				C218_KeyCode;
+
+	switch (brd->boardType) {
+	case MOXA_BOARD_CP204J:
+	case MOXA_BOARD_C218_ISA:
+	case MOXA_BOARD_C218_PCI:
+		key = C218_key;
+		loadbuf = C218_LoadBuf;
+		loadlen = C218DLoad_len;
+		checksum = C218check_sum;
+		checksum_ok = C218chksum_ok;
+		break;
+	default:
+		key = C320_key;
+		keycode = C320_KeyCode;
+		loadbuf = C320_LoadBuf;
+		loadlen = C320DLoad_len;
+		checksum = C320check_sum;
+		checksum_ok = C320chksum_ok;
+		break;
+	}
+
+	usum = 0;
+	wlen = len >> 1;
+	for (i = 0; i < wlen; i++)
+		usum += le16_to_cpu(uptr[i]);
+	retry = 0;
+	do {
+		wlen = len >> 1;
+		j = 0;
+		while (wlen) {
+			len2 = (wlen > 2048) ? 2048 : wlen;
+			wlen -= len2;
+			memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
+			j += len2 << 1;
+
+			writew(len2, baseAddr + loadlen);
+			writew(0, baseAddr + key);
+			for (i = 0; i < 100; i++) {
+				if (readw(baseAddr + key) == keycode)
+					break;
+				msleep(10);
+			}
+			if (readw(baseAddr + key) != keycode)
+				return -EIO;
+		}
+		writew(0, baseAddr + loadlen);
+		writew(usum, baseAddr + checksum);
+		writew(0, baseAddr + key);
+		for (i = 0; i < 100; i++) {
+			if (readw(baseAddr + key) == keycode)
+				break;
+			msleep(10);
+		}
+		retry++;
+	} while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
+	if (readb(baseAddr + checksum_ok) != 1)
+		return -EIO;
+
+	writew(0, baseAddr + key);
+	for (i = 0; i < 600; i++) {
+		if (readw(baseAddr + Magic_no) == Magic_code)
+			break;
+		msleep(10);
+	}
+	if (readw(baseAddr + Magic_no) != Magic_code)
+		return -EIO;
+
+	if (MOXA_IS_320(brd)) {
+		if (brd->busType == MOXA_BUS_TYPE_PCI) {	/* ASIC board */
+			writew(0x3800, baseAddr + TMS320_PORT1);
+			writew(0x3900, baseAddr + TMS320_PORT2);
+			writew(28499, baseAddr + TMS320_CLOCK);
+		} else {
+			writew(0x3200, baseAddr + TMS320_PORT1);
+			writew(0x3400, baseAddr + TMS320_PORT2);
+			writew(19999, baseAddr + TMS320_CLOCK);
+		}
+	}
+	writew(1, baseAddr + Disable_IRQ);
+	writew(0, baseAddr + Magic_no);
+	for (i = 0; i < 500; i++) {
+		if (readw(baseAddr + Magic_no) == Magic_code)
+			break;
+		msleep(10);
+	}
+	if (readw(baseAddr + Magic_no) != Magic_code)
+		return -EIO;
+
+	if (MOXA_IS_320(brd)) {
+		j = readw(baseAddr + Module_cnt);
+		if (j <= 0)
+			return -EIO;
+		brd->numPorts = j * 8;
+		writew(j, baseAddr + Module_no);
+		writew(0, baseAddr + Magic_no);
+		for (i = 0; i < 600; i++) {
+			if (readw(baseAddr + Magic_no) == Magic_code)
+				break;
+			msleep(10);
+		}
+		if (readw(baseAddr + Magic_no) != Magic_code)
+			return -EIO;
+	}
+	brd->intNdx = baseAddr + IRQindex;
+	brd->intPend = baseAddr + IRQpending;
+	brd->intTable = baseAddr + IRQtable;
+
+	return 0;
+}
+
+static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
+		size_t len)
+{
+	void __iomem *ofsAddr, *baseAddr = brd->basemem;
+	struct moxa_port *port;
+	int retval, i;
+
+	if (len % 2) {
+		printk(KERN_ERR "MOXA: bios length is not even\n");
+		return -EINVAL;
+	}
+
+	retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
+	if (retval)
+		return retval;
+
+	switch (brd->boardType) {
+	case MOXA_BOARD_C218_ISA:
+	case MOXA_BOARD_C218_PCI:
+	case MOXA_BOARD_CP204J:
+		port = brd->ports;
+		for (i = 0; i < brd->numPorts; i++, port++) {
+			port->board = brd;
+			port->DCDState = 0;
+			port->tableAddr = baseAddr + Extern_table +
+					Extern_size * i;
+			ofsAddr = port->tableAddr;
+			writew(C218rx_mask, ofsAddr + RX_mask);
+			writew(C218tx_mask, ofsAddr + TX_mask);
+			writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
+			writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
+
+			writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
+			writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
+
+		}
+		break;
+	default:
+		port = brd->ports;
+		for (i = 0; i < brd->numPorts; i++, port++) {
+			port->board = brd;
+			port->DCDState = 0;
+			port->tableAddr = baseAddr + Extern_table +
+					Extern_size * i;
+			ofsAddr = port->tableAddr;
+			switch (brd->numPorts) {
+			case 8:
+				writew(C320p8rx_mask, ofsAddr + RX_mask);
+				writew(C320p8tx_mask, ofsAddr + TX_mask);
+				writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
+				writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
+				writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
+				writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
+
+				break;
+			case 16:
+				writew(C320p16rx_mask, ofsAddr + RX_mask);
+				writew(C320p16tx_mask, ofsAddr + TX_mask);
+				writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
+				writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
+				writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
+				writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
+				break;
+
+			case 24:
+				writew(C320p24rx_mask, ofsAddr + RX_mask);
+				writew(C320p24tx_mask, ofsAddr + TX_mask);
+				writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
+				writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
+				writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
+				writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
+				break;
+			case 32:
+				writew(C320p32rx_mask, ofsAddr + RX_mask);
+				writew(C320p32tx_mask, ofsAddr + TX_mask);
+				writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
+				writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
+				writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
+				writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
+				writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
+				break;
+			}
+		}
+		break;
+	}
+	return 0;
+}
+
+static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
+{
+	const void *ptr = fw->data;
+	char rsn[64];
+	u16 lens[5];
+	size_t len;
+	unsigned int a, lenp, lencnt;
+	int ret = -EINVAL;
+	struct {
+		__le32 magic;	/* 0x34303430 */
+		u8 reserved1[2];
+		u8 type;	/* UNIX = 3 */
+		u8 model;	/* C218T=1, C320T=2, CP204=3 */
+		u8 reserved2[8];
+		__le16 len[5];
+	} const *hdr = ptr;
+
+	BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
+
+	if (fw->size < MOXA_FW_HDRLEN) {
+		strcpy(rsn, "too short (even header won't fit)");
+		goto err;
+	}
+	if (hdr->magic != cpu_to_le32(0x30343034)) {
+		sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
+		goto err;
+	}
+	if (hdr->type != 3) {
+		sprintf(rsn, "not for linux, type is %u", hdr->type);
+		goto err;
+	}
+	if (moxa_check_fw_model(brd, hdr->model)) {
+		sprintf(rsn, "not for this card, model is %u", hdr->model);
+		goto err;
+	}
+
+	len = MOXA_FW_HDRLEN;
+	lencnt = hdr->model == 2 ? 5 : 3;
+	for (a = 0; a < ARRAY_SIZE(lens); a++) {
+		lens[a] = le16_to_cpu(hdr->len[a]);
+		if (lens[a] && len + lens[a] <= fw->size &&
+				moxa_check_fw(&fw->data[len]))
+			printk(KERN_WARNING "MOXA firmware: unexpected input "
+				"at offset %u, but going on\n", (u32)len);
+		if (!lens[a] && a < lencnt) {
+			sprintf(rsn, "too few entries in fw file");
+			goto err;
+		}
+		len += lens[a];
+	}
+
+	if (len != fw->size) {
+		sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
+				(u32)len);
+		goto err;
+	}
+
+	ptr += MOXA_FW_HDRLEN;
+	lenp = 0; /* bios */
+
+	strcpy(rsn, "read above");
+
+	ret = moxa_load_bios(brd, ptr, lens[lenp]);
+	if (ret)
+		goto err;
+
+	/* we skip the tty section (lens[1]), since we don't need it */
+	ptr += lens[lenp] + lens[lenp + 1];
+	lenp += 2; /* comm */
+
+	if (hdr->model == 2) {
+		ret = moxa_load_320b(brd, ptr, lens[lenp]);
+		if (ret)
+			goto err;
+		/* skip another tty */
+		ptr += lens[lenp] + lens[lenp + 1];
+		lenp += 2;
+	}
+
+	ret = moxa_load_code(brd, ptr, lens[lenp]);
+	if (ret)
+		goto err;
+
+	return 0;
+err:
+	printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
+	return ret;
+}
+
+static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
+{
+	const struct firmware *fw;
+	const char *file;
+	struct moxa_port *p;
+	unsigned int i, first_idx;
+	int ret;
+
+	brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
+			GFP_KERNEL);
+	if (brd->ports == NULL) {
+		printk(KERN_ERR "cannot allocate memory for ports\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
+		tty_port_init(&p->port);
+		p->port.ops = &moxa_port_ops;
+		p->type = PORT_16550A;
+		p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
+	}
+
+	switch (brd->boardType) {
+	case MOXA_BOARD_C218_ISA:
+	case MOXA_BOARD_C218_PCI:
+		file = "c218tunx.cod";
+		break;
+	case MOXA_BOARD_CP204J:
+		file = "cp204unx.cod";
+		break;
+	default:
+		file = "c320tunx.cod";
+		break;
+	}
+
+	ret = request_firmware(&fw, file, dev);
+	if (ret) {
+		printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
+				"you've placed '%s' file into your firmware "
+				"loader directory (e.g. /lib/firmware)\n",
+				file);
+		goto err_free;
+	}
+
+	ret = moxa_load_fw(brd, fw);
+
+	release_firmware(fw);
+
+	if (ret)
+		goto err_free;
+
+	spin_lock_bh(&moxa_lock);
+	brd->ready = 1;
+	if (!timer_pending(&moxaTimer))
+		mod_timer(&moxaTimer, jiffies + HZ / 50);
+	spin_unlock_bh(&moxa_lock);
+
+	first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
+	for (i = 0; i < brd->numPorts; i++)
+		tty_port_register_device(&brd->ports[i].port, moxaDriver,
+				first_idx + i, dev);
+
+	return 0;
+err_free:
+	for (i = 0; i < MAX_PORTS_PER_BOARD; i++)
+		tty_port_destroy(&brd->ports[i].port);
+	kfree(brd->ports);
+err:
+	return ret;
+}
+
+static void moxa_board_deinit(struct moxa_board_conf *brd)
+{
+	unsigned int a, opened, first_idx;
+
+	mutex_lock(&moxa_openlock);
+	spin_lock_bh(&moxa_lock);
+	brd->ready = 0;
+	spin_unlock_bh(&moxa_lock);
+
+	/* pci hot-un-plug support */
+	for (a = 0; a < brd->numPorts; a++)
+		if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
+			tty_port_tty_hangup(&brd->ports[a].port, false);
+
+	for (a = 0; a < MAX_PORTS_PER_BOARD; a++)
+		tty_port_destroy(&brd->ports[a].port);
+
+	while (1) {
+		opened = 0;
+		for (a = 0; a < brd->numPorts; a++)
+			if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
+				opened++;
+		mutex_unlock(&moxa_openlock);
+		if (!opened)
+			break;
+		msleep(50);
+		mutex_lock(&moxa_openlock);
+	}
+
+	first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
+	for (a = 0; a < brd->numPorts; a++)
+		tty_unregister_device(moxaDriver, first_idx + a);
+
+	iounmap(brd->basemem);
+	brd->basemem = NULL;
+	kfree(brd->ports);
+}
+
+#ifdef CONFIG_PCI
+static int moxa_pci_probe(struct pci_dev *pdev,
+		const struct pci_device_id *ent)
+{
+	struct moxa_board_conf *board;
+	unsigned int i;
+	int board_type = ent->driver_data;
+	int retval;
+
+	retval = pci_enable_device(pdev);
+	if (retval) {
+		dev_err(&pdev->dev, "can't enable pci device\n");
+		goto err;
+	}
+
+	for (i = 0; i < MAX_BOARDS; i++)
+		if (moxa_boards[i].basemem == NULL)
+			break;
+
+	retval = -ENODEV;
+	if (i >= MAX_BOARDS) {
+		dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
+				"found. Board is ignored.\n", MAX_BOARDS);
+		goto err;
+	}
+
+	board = &moxa_boards[i];
+
+	retval = pci_request_region(pdev, 2, "moxa-base");
+	if (retval) {
+		dev_err(&pdev->dev, "can't request pci region 2\n");
+		goto err;
+	}
+
+	board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
+	if (board->basemem == NULL) {
+		dev_err(&pdev->dev, "can't remap io space 2\n");
+		retval = -ENOMEM;
+		goto err_reg;
+	}
+
+	board->boardType = board_type;
+	switch (board_type) {
+	case MOXA_BOARD_C218_ISA:
+	case MOXA_BOARD_C218_PCI:
+		board->numPorts = 8;
+		break;
+
+	case MOXA_BOARD_CP204J:
+		board->numPorts = 4;
+		break;
+	default:
+		board->numPorts = 0;
+		break;
+	}
+	board->busType = MOXA_BUS_TYPE_PCI;
+
+	retval = moxa_init_board(board, &pdev->dev);
+	if (retval)
+		goto err_base;
+
+	pci_set_drvdata(pdev, board);
+
+	dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
+			moxa_brdname[board_type - 1], board->numPorts);
+
+	return 0;
+err_base:
+	iounmap(board->basemem);
+	board->basemem = NULL;
+err_reg:
+	pci_release_region(pdev, 2);
+err:
+	return retval;
+}
+
+static void moxa_pci_remove(struct pci_dev *pdev)
+{
+	struct moxa_board_conf *brd = pci_get_drvdata(pdev);
+
+	moxa_board_deinit(brd);
+
+	pci_release_region(pdev, 2);
+}
+
+static struct pci_driver moxa_pci_driver = {
+	.name = "moxa",
+	.id_table = moxa_pcibrds,
+	.probe = moxa_pci_probe,
+	.remove = moxa_pci_remove
+};
+#endif /* CONFIG_PCI */
+
+static int __init moxa_init(void)
+{
+	unsigned int isabrds = 0;
+	int retval = 0;
+	struct moxa_board_conf *brd = moxa_boards;
+	unsigned int i;
+
+	printk(KERN_INFO "MOXA Intellio family driver version %s\n",
+			MOXA_VERSION);
+
+	tty_port_init(&moxa_service_port);
+
+	moxaDriver = tty_alloc_driver(MAX_PORTS + 1,
+			TTY_DRIVER_REAL_RAW |
+			TTY_DRIVER_DYNAMIC_DEV);
+	if (IS_ERR(moxaDriver))
+		return PTR_ERR(moxaDriver);
+
+	moxaDriver->name = "ttyMX";
+	moxaDriver->major = ttymajor;
+	moxaDriver->minor_start = 0;
+	moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
+	moxaDriver->subtype = SERIAL_TYPE_NORMAL;
+	moxaDriver->init_termios = tty_std_termios;
+	moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
+	moxaDriver->init_termios.c_ispeed = 9600;
+	moxaDriver->init_termios.c_ospeed = 9600;
+	tty_set_operations(moxaDriver, &moxa_ops);
+	/* Having one more port only for ioctls is ugly */
+	tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS);
+
+	if (tty_register_driver(moxaDriver)) {
+		printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
+		put_tty_driver(moxaDriver);
+		return -1;
+	}
+
+	/* Find the boards defined from module args. */
+
+	for (i = 0; i < MAX_BOARDS; i++) {
+		if (!baseaddr[i])
+			break;
+		if (type[i] == MOXA_BOARD_C218_ISA ||
+				type[i] == MOXA_BOARD_C320_ISA) {
+			pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
+					isabrds + 1, moxa_brdname[type[i] - 1],
+					baseaddr[i]);
+			brd->boardType = type[i];
+			brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
+					numports[i];
+			brd->busType = MOXA_BUS_TYPE_ISA;
+			brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
+			if (!brd->basemem) {
+				printk(KERN_ERR "MOXA: can't remap %lx\n",
+						baseaddr[i]);
+				continue;
+			}
+			if (moxa_init_board(brd, NULL)) {
+				iounmap(brd->basemem);
+				brd->basemem = NULL;
+				continue;
+			}
+
+			printk(KERN_INFO "MOXA isa board found at 0x%.8lx and "
+					"ready (%u ports, firmware loaded)\n",
+					baseaddr[i], brd->numPorts);
+
+			brd++;
+			isabrds++;
+		}
+	}
+
+#ifdef CONFIG_PCI
+	retval = pci_register_driver(&moxa_pci_driver);
+	if (retval) {
+		printk(KERN_ERR "Can't register MOXA pci driver!\n");
+		if (isabrds)
+			retval = 0;
+	}
+#endif
+
+	return retval;
+}
+
+static void __exit moxa_exit(void)
+{
+	unsigned int i;
+
+#ifdef CONFIG_PCI
+	pci_unregister_driver(&moxa_pci_driver);
+#endif
+
+	for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
+		if (moxa_boards[i].ready)
+			moxa_board_deinit(&moxa_boards[i]);
+
+	del_timer_sync(&moxaTimer);
+
+	if (tty_unregister_driver(moxaDriver))
+		printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
+				"serial driver\n");
+	put_tty_driver(moxaDriver);
+}
+
+module_init(moxa_init);
+module_exit(moxa_exit);
+
+static void moxa_shutdown(struct tty_port *port)
+{
+	struct moxa_port *ch = container_of(port, struct moxa_port, port);
+        MoxaPortDisable(ch);
+	MoxaPortFlushData(ch, 2);
+}
+
+static int moxa_carrier_raised(struct tty_port *port)
+{
+	struct moxa_port *ch = container_of(port, struct moxa_port, port);
+	int dcd;
+
+	spin_lock_irq(&port->lock);
+	dcd = ch->DCDState;
+	spin_unlock_irq(&port->lock);
+	return dcd;
+}
+
+static void moxa_dtr_rts(struct tty_port *port, int onoff)
+{
+	struct moxa_port *ch = container_of(port, struct moxa_port, port);
+	MoxaPortLineCtrl(ch, onoff, onoff);
+}
+
+
+static int moxa_open(struct tty_struct *tty, struct file *filp)
+{
+	struct moxa_board_conf *brd;
+	struct moxa_port *ch;
+	int port;
+
+	port = tty->index;
+	if (port == MAX_PORTS) {
+		return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
+	}
+	if (mutex_lock_interruptible(&moxa_openlock))
+		return -ERESTARTSYS;
+	brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
+	if (!brd->ready) {
+		mutex_unlock(&moxa_openlock);
+		return -ENODEV;
+	}
+
+	if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
+		mutex_unlock(&moxa_openlock);
+		return -ENODEV;
+	}
+
+	ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
+	ch->port.count++;
+	tty->driver_data = ch;
+	tty_port_tty_set(&ch->port, tty);
+	mutex_lock(&ch->port.mutex);
+	if (!(ch->port.flags & ASYNC_INITIALIZED)) {
+		ch->statusflags = 0;
+		moxa_set_tty_param(tty, &tty->termios);
+		MoxaPortLineCtrl(ch, 1, 1);
+		MoxaPortEnable(ch);
+		MoxaSetFifo(ch, ch->type == PORT_16550A);
+		ch->port.flags |= ASYNC_INITIALIZED;
+	}
+	mutex_unlock(&ch->port.mutex);
+	mutex_unlock(&moxa_openlock);
+
+	return tty_port_block_til_ready(&ch->port, tty, filp);
+}
+
+static void moxa_close(struct tty_struct *tty, struct file *filp)
+{
+	struct moxa_port *ch = tty->driver_data;
+	ch->cflag = tty->termios.c_cflag;
+	tty_port_close(&ch->port, tty, filp);
+}
+
+static int moxa_write(struct tty_struct *tty,
+		      const unsigned char *buf, int count)
+{
+	struct moxa_port *ch = tty->driver_data;
+	unsigned long flags;
+	int len;
+
+	if (ch == NULL)
+		return 0;
+
+	spin_lock_irqsave(&moxa_lock, flags);
+	len = MoxaPortWriteData(tty, buf, count);
+	spin_unlock_irqrestore(&moxa_lock, flags);
+
+	set_bit(LOWWAIT, &ch->statusflags);
+	return len;
+}
+
+static int moxa_write_room(struct tty_struct *tty)
+{
+	struct moxa_port *ch;
+
+	if (tty->stopped)
+		return 0;
+	ch = tty->driver_data;
+	if (ch == NULL)
+		return 0;
+	return MoxaPortTxFree(ch);
+}
+
+static void moxa_flush_buffer(struct tty_struct *tty)
+{
+	struct moxa_port *ch = tty->driver_data;
+
+	if (ch == NULL)
+		return;
+	MoxaPortFlushData(ch, 1);
+	tty_wakeup(tty);
+}
+
+static int moxa_chars_in_buffer(struct tty_struct *tty)
+{
+	struct moxa_port *ch = tty->driver_data;
+	int chars;
+
+	chars = MoxaPortTxQueue(ch);
+	if (chars)
+		/*
+		 * Make it possible to wakeup anything waiting for output
+		 * in tty_ioctl.c, etc.
+		 */
+        	set_bit(EMPTYWAIT, &ch->statusflags);
+	return chars;
+}
+
+static int moxa_tiocmget(struct tty_struct *tty)
+{
+	struct moxa_port *ch = tty->driver_data;
+	int flag = 0, dtr, rts;
+
+	MoxaPortGetLineOut(ch, &dtr, &rts);
+	if (dtr)
+		flag |= TIOCM_DTR;
+	if (rts)
+		flag |= TIOCM_RTS;
+	dtr = MoxaPortLineStatus(ch);
+	if (dtr & 1)
+		flag |= TIOCM_CTS;
+	if (dtr & 2)
+		flag |= TIOCM_DSR;
+	if (dtr & 4)
+		flag |= TIOCM_CD;
+	return flag;
+}
+
+static int moxa_tiocmset(struct tty_struct *tty,
+			 unsigned int set, unsigned int clear)
+{
+	struct moxa_port *ch;
+	int dtr, rts;
+
+	mutex_lock(&moxa_openlock);
+	ch = tty->driver_data;
+	if (!ch) {
+		mutex_unlock(&moxa_openlock);
+		return -EINVAL;
+	}
+
+	MoxaPortGetLineOut(ch, &dtr, &rts);
+	if (set & TIOCM_RTS)
+		rts = 1;
+	if (set & TIOCM_DTR)
+		dtr = 1;
+	if (clear & TIOCM_RTS)
+		rts = 0;
+	if (clear & TIOCM_DTR)
+		dtr = 0;
+	MoxaPortLineCtrl(ch, dtr, rts);
+	mutex_unlock(&moxa_openlock);
+	return 0;
+}
+
+static void moxa_set_termios(struct tty_struct *tty,
+		struct ktermios *old_termios)
+{
+	struct moxa_port *ch = tty->driver_data;
+
+	if (ch == NULL)
+		return;
+	moxa_set_tty_param(tty, old_termios);
+	if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
+		wake_up_interruptible(&ch->port.open_wait);
+}
+
+static void moxa_stop(struct tty_struct *tty)
+{
+	struct moxa_port *ch = tty->driver_data;
+
+	if (ch == NULL)
+		return;
+	MoxaPortTxDisable(ch);
+	set_bit(TXSTOPPED, &ch->statusflags);
+}
+
+
+static void moxa_start(struct tty_struct *tty)
+{
+	struct moxa_port *ch = tty->driver_data;
+
+	if (ch == NULL)
+		return;
+
+	if (!test_bit(TXSTOPPED, &ch->statusflags))
+		return;
+
+	MoxaPortTxEnable(ch);
+	clear_bit(TXSTOPPED, &ch->statusflags);
+}
+
+static void moxa_hangup(struct tty_struct *tty)
+{
+	struct moxa_port *ch = tty->driver_data;
+	tty_port_hangup(&ch->port);
+}
+
+static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
+{
+	unsigned long flags;
+	dcd = !!dcd;
+
+	spin_lock_irqsave(&p->port.lock, flags);
+	if (dcd != p->DCDState) {
+        	p->DCDState = dcd;
+        	spin_unlock_irqrestore(&p->port.lock, flags);
+		if (!dcd)
+			tty_port_tty_hangup(&p->port, true);
+	}
+	else
+		spin_unlock_irqrestore(&p->port.lock, flags);
+}
+
+static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
+		u16 __iomem *ip)
+{
+	struct tty_struct *tty = tty_port_tty_get(&p->port);
+	void __iomem *ofsAddr;
+	unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
+	u16 intr;
+
+	if (tty) {
+		if (test_bit(EMPTYWAIT, &p->statusflags) &&
+				MoxaPortTxQueue(p) == 0) {
+			clear_bit(EMPTYWAIT, &p->statusflags);
+			tty_wakeup(tty);
+		}
+		if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
+				MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
+			clear_bit(LOWWAIT, &p->statusflags);
+			tty_wakeup(tty);
+		}
+
+		if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
+				MoxaPortRxQueue(p) > 0) { /* RX */
+			MoxaPortReadData(p);
+			tty_schedule_flip(&p->port);
+		}
+	} else {
+		clear_bit(EMPTYWAIT, &p->statusflags);
+		MoxaPortFlushData(p, 0); /* flush RX */
+	}
+
+	if (!handle) /* nothing else to do */
+		goto put;
+
+	intr = readw(ip); /* port irq status */
+	if (intr == 0)
+		goto put;
+
+	writew(0, ip); /* ACK port */
+	ofsAddr = p->tableAddr;
+	if (intr & IntrTx) /* disable tx intr */
+		writew(readw(ofsAddr + HostStat) & ~WakeupTx,
+				ofsAddr + HostStat);
+
+	if (!inited)
+		goto put;
+
+	if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
+		tty_insert_flip_char(&p->port, 0, TTY_BREAK);
+		tty_schedule_flip(&p->port);
+	}
+
+	if (intr & IntrLine)
+		moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
+put:
+	tty_kref_put(tty);
+
+	return 0;
+}
+
+static void moxa_poll(unsigned long ignored)
+{
+	struct moxa_board_conf *brd;
+	u16 __iomem *ip;
+	unsigned int card, port, served = 0;
+
+	spin_lock(&moxa_lock);
+	for (card = 0; card < MAX_BOARDS; card++) {
+		brd = &moxa_boards[card];
+		if (!brd->ready)
+			continue;
+
+		served++;
+
+		ip = NULL;
+		if (readb(brd->intPend) == 0xff)
+			ip = brd->intTable + readb(brd->intNdx);
+
+		for (port = 0; port < brd->numPorts; port++)
+			moxa_poll_port(&brd->ports[port], !!ip, ip + port);
+
+		if (ip)
+			writeb(0, brd->intPend); /* ACK */
+
+		if (moxaLowWaterChk) {
+			struct moxa_port *p = brd->ports;
+			for (port = 0; port < brd->numPorts; port++, p++)
+				if (p->lowChkFlag) {
+					p->lowChkFlag = 0;
+					moxa_low_water_check(p->tableAddr);
+				}
+		}
+	}
+	moxaLowWaterChk = 0;
+
+	if (served)
+		mod_timer(&moxaTimer, jiffies + HZ / 50);
+	spin_unlock(&moxa_lock);
+}
+
+/******************************************************************************/
+
+static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
+{
+	register struct ktermios *ts = &tty->termios;
+	struct moxa_port *ch = tty->driver_data;
+	int rts, cts, txflow, rxflow, xany, baud;
+
+	rts = cts = txflow = rxflow = xany = 0;
+	if (ts->c_cflag & CRTSCTS)
+		rts = cts = 1;
+	if (ts->c_iflag & IXON)
+		txflow = 1;
+	if (ts->c_iflag & IXOFF)
+		rxflow = 1;
+	if (ts->c_iflag & IXANY)
+		xany = 1;
+
+	/* Clear the features we don't support */
+	ts->c_cflag &= ~CMSPAR;
+	MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
+	baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
+	if (baud == -1)
+		baud = tty_termios_baud_rate(old_termios);
+	/* Not put the baud rate into the termios data */
+	tty_encode_baud_rate(tty, baud, baud);
+}
+
+/*****************************************************************************
+ *	Driver level functions: 					     *
+ *****************************************************************************/
+
+static void MoxaPortFlushData(struct moxa_port *port, int mode)
+{
+	void __iomem *ofsAddr;
+	if (mode < 0 || mode > 2)
+		return;
+	ofsAddr = port->tableAddr;
+	moxafunc(ofsAddr, FC_FlushQueue, mode);
+	if (mode != 1) {
+		port->lowChkFlag = 0;
+		moxa_low_water_check(ofsAddr);
+	}
+}
+
+/*
+ *    Moxa Port Number Description:
+ *
+ *      MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
+ *      the port number using in MOXA driver functions will be 0 to 31 for
+ *      first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
+ *      to 127 for fourth. For example, if you setup three MOXA boards,
+ *      first board is C218, second board is C320-16 and third board is
+ *      C320-32. The port number of first board (C218 - 8 ports) is from
+ *      0 to 7. The port number of second board (C320 - 16 ports) is form
+ *      32 to 47. The port number of third board (C320 - 32 ports) is from
+ *      64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
+ *      127 will be invalid.
+ *
+ *
+ *      Moxa Functions Description:
+ *
+ *      Function 1:     Driver initialization routine, this routine must be
+ *                      called when initialized driver.
+ *      Syntax:
+ *      void MoxaDriverInit();
+ *
+ *
+ *      Function 2:     Moxa driver private IOCTL command processing.
+ *      Syntax:
+ *      int  MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
+ *
+ *           unsigned int cmd   : IOCTL command
+ *           unsigned long arg  : IOCTL argument
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    0  (OK)
+ *                      -EINVAL
+ *                      -ENOIOCTLCMD
+ *
+ *
+ *      Function 6:     Enable this port to start Tx/Rx data.
+ *      Syntax:
+ *      void MoxaPortEnable(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *
+ *      Function 7:     Disable this port
+ *      Syntax:
+ *      void MoxaPortDisable(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *
+ *      Function 10:    Setting baud rate of this port.
+ *      Syntax:
+ *      speed_t MoxaPortSetBaud(int port, speed_t baud);
+ *           int port           : port number (0 - 127)
+ *           long baud          : baud rate (50 - 115200)
+ *
+ *           return:    0       : this port is invalid or baud < 50
+ *                      50 - 115200 : the real baud rate set to the port, if
+ *                                    the argument baud is large than maximun
+ *                                    available baud rate, the real setting
+ *                                    baud rate will be the maximun baud rate.
+ *
+ *
+ *      Function 12:    Configure the port.
+ *      Syntax:
+ *      int  MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
+ *           int port           : port number (0 - 127)
+ *           struct ktermios * termio : termio structure pointer
+ *	     speed_t baud	: baud rate
+ *
+ *           return:    -1      : this port is invalid or termio == NULL
+ *                      0       : setting O.K.
+ *
+ *
+ *      Function 13:    Get the DTR/RTS state of this port.
+ *      Syntax:
+ *      int  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
+ *           int port           : port number (0 - 127)
+ *           int * dtrState     : pointer to INT to receive the current DTR
+ *                                state. (if NULL, this function will not
+ *                                write to this address)
+ *           int * rtsState     : pointer to INT to receive the current RTS
+ *                                state. (if NULL, this function will not
+ *                                write to this address)
+ *
+ *           return:    -1      : this port is invalid
+ *                      0       : O.K.
+ *
+ *
+ *      Function 14:    Setting the DTR/RTS output state of this port.
+ *      Syntax:
+ *      void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
+ *           int port           : port number (0 - 127)
+ *           int dtrState       : DTR output state (0: off, 1: on)
+ *           int rtsState       : RTS output state (0: off, 1: on)
+ *
+ *
+ *      Function 15:    Setting the flow control of this port.
+ *      Syntax:
+ *      void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
+ *                            int txFlow,int xany);
+ *           int port           : port number (0 - 127)
+ *           int rtsFlow        : H/W RTS flow control (0: no, 1: yes)
+ *           int ctsFlow        : H/W CTS flow control (0: no, 1: yes)
+ *           int rxFlow         : S/W Rx XON/XOFF flow control (0: no, 1: yes)
+ *           int txFlow         : S/W Tx XON/XOFF flow control (0: no, 1: yes)
+ *           int xany           : S/W XANY flow control (0: no, 1: yes)
+ *
+ *
+ *      Function 16:    Get ths line status of this port
+ *      Syntax:
+ *      int  MoxaPortLineStatus(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    Bit 0 - CTS state (0: off, 1: on)
+ *                      Bit 1 - DSR state (0: off, 1: on)
+ *                      Bit 2 - DCD state (0: off, 1: on)
+ *
+ *
+ *      Function 19:    Flush the Rx/Tx buffer data of this port.
+ *      Syntax:
+ *      void MoxaPortFlushData(int port, int mode);
+ *           int port           : port number (0 - 127)
+ *           int mode    
+ *                      0       : flush the Rx buffer 
+ *                      1       : flush the Tx buffer 
+ *                      2       : flush the Rx and Tx buffer 
+ *
+ *
+ *      Function 20:    Write data.
+ *      Syntax:
+ *      int  MoxaPortWriteData(int port, unsigned char * buffer, int length);
+ *           int port           : port number (0 - 127)
+ *           unsigned char * buffer     : pointer to write data buffer.
+ *           int length         : write data length
+ *
+ *           return:    0 - length      : real write data length
+ *
+ *
+ *      Function 21:    Read data.
+ *      Syntax:
+ *      int  MoxaPortReadData(int port, struct tty_struct *tty);
+ *           int port           : port number (0 - 127)
+ *	     struct tty_struct *tty : tty for data
+ *
+ *           return:    0 - length      : real read data length
+ *
+ *
+ *      Function 24:    Get the Tx buffer current queued data bytes
+ *      Syntax:
+ *      int  MoxaPortTxQueue(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    ..      : Tx buffer current queued data bytes
+ *
+ *
+ *      Function 25:    Get the Tx buffer current free space
+ *      Syntax:
+ *      int  MoxaPortTxFree(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    ..      : Tx buffer current free space
+ *
+ *
+ *      Function 26:    Get the Rx buffer current queued data bytes
+ *      Syntax:
+ *      int  MoxaPortRxQueue(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    ..      : Rx buffer current queued data bytes
+ *
+ *
+ *      Function 28:    Disable port data transmission.
+ *      Syntax:
+ *      void MoxaPortTxDisable(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *
+ *      Function 29:    Enable port data transmission.
+ *      Syntax:
+ *      void MoxaPortTxEnable(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *
+ *      Function 31:    Get the received BREAK signal count and reset it.
+ *      Syntax:
+ *      int  MoxaPortResetBrkCnt(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    0 - ..  : BREAK signal count
+ *
+ *
+ */
+
+static void MoxaPortEnable(struct moxa_port *port)
+{
+	void __iomem *ofsAddr;
+	u16 lowwater = 512;
+
+	ofsAddr = port->tableAddr;
+	writew(lowwater, ofsAddr + Low_water);
+	if (MOXA_IS_320(port->board))
+		moxafunc(ofsAddr, FC_SetBreakIrq, 0);
+	else
+		writew(readw(ofsAddr + HostStat) | WakeupBreak,
+				ofsAddr + HostStat);
+
+	moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
+	moxafunc(ofsAddr, FC_FlushQueue, 2);
+
+	moxafunc(ofsAddr, FC_EnableCH, Magic_code);
+	MoxaPortLineStatus(port);
+}
+
+static void MoxaPortDisable(struct moxa_port *port)
+{
+	void __iomem *ofsAddr = port->tableAddr;
+
+	moxafunc(ofsAddr, FC_SetFlowCtl, 0);	/* disable flow control */
+	moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
+	writew(0, ofsAddr + HostStat);
+	moxafunc(ofsAddr, FC_DisableCH, Magic_code);
+}
+
+static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
+{
+	void __iomem *ofsAddr = port->tableAddr;
+	unsigned int clock, val;
+	speed_t max;
+
+	max = MOXA_IS_320(port->board) ? 460800 : 921600;
+	if (baud < 50)
+		return 0;
+	if (baud > max)
+		baud = max;
+	clock = 921600;
+	val = clock / baud;
+	moxafunc(ofsAddr, FC_SetBaud, val);
+	baud = clock / val;
+	return baud;
+}
+
+static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
+		speed_t baud)
+{
+	void __iomem *ofsAddr;
+	tcflag_t mode = 0;
+
+	ofsAddr = port->tableAddr;
+
+	mode = termio->c_cflag & CSIZE;
+	if (mode == CS5)
+		mode = MX_CS5;
+	else if (mode == CS6)
+		mode = MX_CS6;
+	else if (mode == CS7)
+		mode = MX_CS7;
+	else if (mode == CS8)
+		mode = MX_CS8;
+
+	if (termio->c_cflag & CSTOPB) {
+		if (mode == MX_CS5)
+			mode |= MX_STOP15;
+		else
+			mode |= MX_STOP2;
+	} else
+		mode |= MX_STOP1;
+
+	if (termio->c_cflag & PARENB) {
+		if (termio->c_cflag & PARODD)
+			mode |= MX_PARODD;
+		else
+			mode |= MX_PAREVEN;
+	} else
+		mode |= MX_PARNONE;
+
+	moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
+
+	if (MOXA_IS_320(port->board) && baud >= 921600)
+		return -1;
+
+	baud = MoxaPortSetBaud(port, baud);
+
+	if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
+	        spin_lock_irq(&moxafunc_lock);
+		writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
+		writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
+		writeb(FC_SetXonXoff, ofsAddr + FuncCode);
+		moxa_wait_finish(ofsAddr);
+		spin_unlock_irq(&moxafunc_lock);
+
+	}
+	return baud;
+}
+
+static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
+		int *rtsState)
+{
+	if (dtrState)
+		*dtrState = !!(port->lineCtrl & DTR_ON);
+	if (rtsState)
+		*rtsState = !!(port->lineCtrl & RTS_ON);
+
+	return 0;
+}
+
+static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
+{
+	u8 mode = 0;
+
+	if (dtr)
+		mode |= DTR_ON;
+	if (rts)
+		mode |= RTS_ON;
+	port->lineCtrl = mode;
+	moxafunc(port->tableAddr, FC_LineControl, mode);
+}
+
+static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
+		int txflow, int rxflow, int txany)
+{
+	int mode = 0;
+
+	if (rts)
+		mode |= RTS_FlowCtl;
+	if (cts)
+		mode |= CTS_FlowCtl;
+	if (txflow)
+		mode |= Tx_FlowCtl;
+	if (rxflow)
+		mode |= Rx_FlowCtl;
+	if (txany)
+		mode |= IXM_IXANY;
+	moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
+}
+
+static int MoxaPortLineStatus(struct moxa_port *port)
+{
+	void __iomem *ofsAddr;
+	int val;
+
+	ofsAddr = port->tableAddr;
+	if (MOXA_IS_320(port->board))
+		val = moxafuncret(ofsAddr, FC_LineStatus, 0);
+	else
+		val = readw(ofsAddr + FlagStat) >> 4;
+	val &= 0x0B;
+	if (val & 8)
+		val |= 4;
+	moxa_new_dcdstate(port, val & 8);
+	val &= 7;
+	return val;
+}
+
+static int MoxaPortWriteData(struct tty_struct *tty,
+		const unsigned char *buffer, int len)
+{
+	struct moxa_port *port = tty->driver_data;
+	void __iomem *baseAddr, *ofsAddr, *ofs;
+	unsigned int c, total;
+	u16 head, tail, tx_mask, spage, epage;
+	u16 pageno, pageofs, bufhead;
+
+	ofsAddr = port->tableAddr;
+	baseAddr = port->board->basemem;
+	tx_mask = readw(ofsAddr + TX_mask);
+	spage = readw(ofsAddr + Page_txb);
+	epage = readw(ofsAddr + EndPage_txb);
+	tail = readw(ofsAddr + TXwptr);
+	head = readw(ofsAddr + TXrptr);
+	c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
+	if (c > len)
+		c = len;
+	moxaLog.txcnt[port->port.tty->index] += c;
+	total = c;
+	if (spage == epage) {
+		bufhead = readw(ofsAddr + Ofs_txb);
+		writew(spage, baseAddr + Control_reg);
+		while (c > 0) {
+			if (head > tail)
+				len = head - tail - 1;
+			else
+				len = tx_mask + 1 - tail;
+			len = (c > len) ? len : c;
+			ofs = baseAddr + DynPage_addr + bufhead + tail;
+			memcpy_toio(ofs, buffer, len);
+			buffer += len;
+			tail = (tail + len) & tx_mask;
+			c -= len;
+		}
+	} else {
+		pageno = spage + (tail >> 13);
+		pageofs = tail & Page_mask;
+		while (c > 0) {
+			len = Page_size - pageofs;
+			if (len > c)
+				len = c;
+			writeb(pageno, baseAddr + Control_reg);
+			ofs = baseAddr + DynPage_addr + pageofs;
+			memcpy_toio(ofs, buffer, len);
+			buffer += len;
+			if (++pageno == epage)
+				pageno = spage;
+			pageofs = 0;
+			c -= len;
+		}
+		tail = (tail + total) & tx_mask;
+	}
+	writew(tail, ofsAddr + TXwptr);
+	writeb(1, ofsAddr + CD180TXirq);	/* start to send */
+	return total;
+}
+
+static int MoxaPortReadData(struct moxa_port *port)
+{
+	struct tty_struct *tty = port->port.tty;
+	unsigned char *dst;
+	void __iomem *baseAddr, *ofsAddr, *ofs;
+	unsigned int count, len, total;
+	u16 tail, rx_mask, spage, epage;
+	u16 pageno, pageofs, bufhead, head;
+
+	ofsAddr = port->tableAddr;
+	baseAddr = port->board->basemem;
+	head = readw(ofsAddr + RXrptr);
+	tail = readw(ofsAddr + RXwptr);
+	rx_mask = readw(ofsAddr + RX_mask);
+	spage = readw(ofsAddr + Page_rxb);
+	epage = readw(ofsAddr + EndPage_rxb);
+	count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
+	if (count == 0)
+		return 0;
+
+	total = count;
+	moxaLog.rxcnt[tty->index] += total;
+	if (spage == epage) {
+		bufhead = readw(ofsAddr + Ofs_rxb);
+		writew(spage, baseAddr + Control_reg);
+		while (count > 0) {
+			ofs = baseAddr + DynPage_addr + bufhead + head;
+			len = (tail >= head) ? (tail - head) :
+					(rx_mask + 1 - head);
+			len = tty_prepare_flip_string(&port->port, &dst,
+					min(len, count));
+			memcpy_fromio(dst, ofs, len);
+			head = (head + len) & rx_mask;
+			count -= len;
+		}
+	} else {
+		pageno = spage + (head >> 13);
+		pageofs = head & Page_mask;
+		while (count > 0) {
+			writew(pageno, baseAddr + Control_reg);
+			ofs = baseAddr + DynPage_addr + pageofs;
+			len = tty_prepare_flip_string(&port->port, &dst,
+					min(Page_size - pageofs, count));
+			memcpy_fromio(dst, ofs, len);
+
+			count -= len;
+			pageofs = (pageofs + len) & Page_mask;
+			if (pageofs == 0 && ++pageno == epage)
+				pageno = spage;
+		}
+		head = (head + total) & rx_mask;
+	}
+	writew(head, ofsAddr + RXrptr);
+	if (readb(ofsAddr + FlagStat) & Xoff_state) {
+		moxaLowWaterChk = 1;
+		port->lowChkFlag = 1;
+	}
+	return total;
+}
+
+
+static int MoxaPortTxQueue(struct moxa_port *port)
+{
+	void __iomem *ofsAddr = port->tableAddr;
+	u16 rptr, wptr, mask;
+
+	rptr = readw(ofsAddr + TXrptr);
+	wptr = readw(ofsAddr + TXwptr);
+	mask = readw(ofsAddr + TX_mask);
+	return (wptr - rptr) & mask;
+}
+
+static int MoxaPortTxFree(struct moxa_port *port)
+{
+	void __iomem *ofsAddr = port->tableAddr;
+	u16 rptr, wptr, mask;
+
+	rptr = readw(ofsAddr + TXrptr);
+	wptr = readw(ofsAddr + TXwptr);
+	mask = readw(ofsAddr + TX_mask);
+	return mask - ((wptr - rptr) & mask);
+}
+
+static int MoxaPortRxQueue(struct moxa_port *port)
+{
+	void __iomem *ofsAddr = port->tableAddr;
+	u16 rptr, wptr, mask;
+
+	rptr = readw(ofsAddr + RXrptr);
+	wptr = readw(ofsAddr + RXwptr);
+	mask = readw(ofsAddr + RX_mask);
+	return (wptr - rptr) & mask;
+}
+
+static void MoxaPortTxDisable(struct moxa_port *port)
+{
+	moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
+}
+
+static void MoxaPortTxEnable(struct moxa_port *port)
+{
+	moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
+}
+
+static int moxa_get_serial_info(struct moxa_port *info,
+		struct serial_struct __user *retinfo)
+{
+	struct serial_struct tmp = {
+		.type = info->type,
+		.line = info->port.tty->index,
+		.flags = info->port.flags,
+		.baud_base = 921600,
+		.close_delay = info->port.close_delay
+	};
+	return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
+}
+
+
+static int moxa_set_serial_info(struct moxa_port *info,
+		struct serial_struct __user *new_info)
+{
+	struct serial_struct new_serial;
+
+	if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
+		return -EFAULT;
+
+	if (new_serial.irq != 0 || new_serial.port != 0 ||
+			new_serial.custom_divisor != 0 ||
+			new_serial.baud_base != 921600)
+		return -EPERM;
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		if (((new_serial.flags & ~ASYNC_USR_MASK) !=
+		     (info->port.flags & ~ASYNC_USR_MASK)))
+			return -EPERM;
+	} else
+		info->port.close_delay = new_serial.close_delay * HZ / 100;
+
+	new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
+	new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
+
+	MoxaSetFifo(info, new_serial.type == PORT_16550A);
+
+	info->type = new_serial.type;
+	return 0;
+}
+
+
+
+/*****************************************************************************
+ *	Static local functions: 					     *
+ *****************************************************************************/
+
+static void MoxaSetFifo(struct moxa_port *port, int enable)
+{
+	void __iomem *ofsAddr = port->tableAddr;
+
+	if (!enable) {
+		moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
+		moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
+	} else {
+		moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
+		moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
+	}
+}