Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2815 insertions, 0 deletions

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
new file mode 100644
index 000000000..8344265a1
--- /dev/null
+++ b/drivers/tty/mxser.c
@@ -0,0 +1,2815 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
+ *
+ *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
+ *	Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
+ *
+ *      This code is loosely based on the 1.8 moxa driver which is based on
+ *	Linux serial driver, written by Linus Torvalds, Theodore T'so and
+ *	others.
+ *
+ *	Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
+ *	<alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
+ *	www.moxa.com.
+ *	- Fixed x86_64 cleanness
+ */
+
+#include <linux/module.h>
+#include <linux/errno.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/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/ratelimit.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <linux/uaccess.h>
+
+#include "mxser.h"
+
+#define	MXSER_VERSION	"2.0.5"		/* 1.14 */
+#define	MXSERMAJOR	 174
+
+#define MXSER_BOARDS		4	/* Max. boards */
+#define MXSER_PORTS_PER_BOARD	8	/* Max. ports per board */
+#define MXSER_PORTS		(MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
+#define MXSER_ISR_PASS_LIMIT	100
+
+/*CheckIsMoxaMust return value*/
+#define MOXA_OTHER_UART		0x00
+#define MOXA_MUST_MU150_HWID	0x01
+#define MOXA_MUST_MU860_HWID	0x02
+
+#define WAKEUP_CHARS		256
+
+#define UART_MCR_AFE		0x20
+#define UART_LSR_SPECIAL	0x1E
+
+#define PCI_DEVICE_ID_POS104UL	0x1044
+#define PCI_DEVICE_ID_CB108	0x1080
+#define PCI_DEVICE_ID_CP102UF	0x1023
+#define PCI_DEVICE_ID_CP112UL	0x1120
+#define PCI_DEVICE_ID_CB114	0x1142
+#define PCI_DEVICE_ID_CP114UL	0x1143
+#define PCI_DEVICE_ID_CB134I	0x1341
+#define PCI_DEVICE_ID_CP138U	0x1380
+
+
+#define C168_ASIC_ID    1
+#define C104_ASIC_ID    2
+#define C102_ASIC_ID	0xB
+#define CI132_ASIC_ID	4
+#define CI134_ASIC_ID	3
+#define CI104J_ASIC_ID  5
+
+#define MXSER_HIGHBAUD	1
+#define MXSER_HAS2	2
+
+/* This is only for PCI */
+static const struct {
+	int type;
+	int tx_fifo;
+	int rx_fifo;
+	int xmit_fifo_size;
+	int rx_high_water;
+	int rx_trigger;
+	int rx_low_water;
+	long max_baud;
+} Gpci_uart_info[] = {
+	{MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
+	{MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
+	{MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
+};
+#define UART_INFO_NUM	ARRAY_SIZE(Gpci_uart_info)
+
+struct mxser_cardinfo {
+	char *name;
+	unsigned int nports;
+	unsigned int flags;
+};
+
+static const struct mxser_cardinfo mxser_cards[] = {
+/* 0*/	{ "C168 series",	8, },
+	{ "C104 series",	4, },
+	{ "CI-104J series",	4, },
+	{ "C168H/PCI series",	8, },
+	{ "C104H/PCI series",	4, },
+/* 5*/	{ "C102 series",	4, MXSER_HAS2 },	/* C102-ISA */
+	{ "CI-132 series",	4, MXSER_HAS2 },
+	{ "CI-134 series",	4, },
+	{ "CP-132 series",	2, },
+	{ "CP-114 series",	4, },
+/*10*/	{ "CT-114 series",	4, },
+	{ "CP-102 series",	2, MXSER_HIGHBAUD },
+	{ "CP-104U series",	4, },
+	{ "CP-168U series",	8, },
+	{ "CP-132U series",	2, },
+/*15*/	{ "CP-134U series",	4, },
+	{ "CP-104JU series",	4, },
+	{ "Moxa UC7000 Serial",	8, },		/* RC7000 */
+	{ "CP-118U series",	8, },
+	{ "CP-102UL series",	2, },
+/*20*/	{ "CP-102U series",	2, },
+	{ "CP-118EL series",	8, },
+	{ "CP-168EL series",	8, },
+	{ "CP-104EL series",	4, },
+	{ "CB-108 series",	8, },
+/*25*/	{ "CB-114 series",	4, },
+	{ "CB-134I series",	4, },
+	{ "CP-138U series",	8, },
+	{ "POS-104UL series",	4, },
+	{ "CP-114UL series",	4, },
+/*30*/	{ "CP-102UF series",	2, },
+	{ "CP-112UL series",	2, },
+};
+
+/* driver_data correspond to the lines in the structure above
+   see also ISA probe function before you change something */
+static const struct pci_device_id mxser_pcibrds[] = {
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),	.driver_data = 3 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),	.driver_data = 4 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),	.driver_data = 8 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),	.driver_data = 9 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),	.driver_data = 10 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),	.driver_data = 11 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U),	.driver_data = 12 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U),	.driver_data = 13 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U),	.driver_data = 14 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U),	.driver_data = 15 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000),	.driver_data = 17 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U),	.driver_data = 18 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U),	.driver_data = 20 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),	.driver_data = 24 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),	.driver_data = 25 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),	.driver_data = 26 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),	.driver_data = 27 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),	.driver_data = 28 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),	.driver_data = 29 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),	.driver_data = 30 },
+	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),	.driver_data = 31 },
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
+
+static unsigned long ioaddr[MXSER_BOARDS];
+static int ttymajor = MXSERMAJOR;
+
+/* Variables for insmod */
+
+MODULE_AUTHOR("Casper Yang");
+MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
+module_param_hw_array(ioaddr, ulong, ioport, NULL, 0);
+MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
+module_param(ttymajor, int, 0);
+MODULE_LICENSE("GPL");
+
+struct mxser_log {
+	int tick;
+	unsigned long rxcnt[MXSER_PORTS];
+	unsigned long txcnt[MXSER_PORTS];
+};
+
+struct mxser_mon {
+	unsigned long rxcnt;
+	unsigned long txcnt;
+	unsigned long up_rxcnt;
+	unsigned long up_txcnt;
+	int modem_status;
+	unsigned char hold_reason;
+};
+
+struct mxser_mon_ext {
+	unsigned long rx_cnt[32];
+	unsigned long tx_cnt[32];
+	unsigned long up_rxcnt[32];
+	unsigned long up_txcnt[32];
+	int modem_status[32];
+
+	long baudrate[32];
+	int databits[32];
+	int stopbits[32];
+	int parity[32];
+	int flowctrl[32];
+	int fifo[32];
+	int iftype[32];
+};
+
+struct mxser_board;
+
+struct mxser_port {
+	struct tty_port port;
+	struct mxser_board *board;
+
+	unsigned long ioaddr;
+	unsigned long opmode_ioaddr;
+	int max_baud;
+
+	int rx_high_water;
+	int rx_trigger;		/* Rx fifo trigger level */
+	int rx_low_water;
+	int baud_base;		/* max. speed */
+	int type;		/* UART type */
+
+	int x_char;		/* xon/xoff character */
+	int IER;		/* Interrupt Enable Register */
+	int MCR;		/* Modem control register */
+
+	unsigned char stop_rx;
+	unsigned char ldisc_stop_rx;
+
+	int custom_divisor;
+	unsigned char err_shadow;
+
+	struct async_icount icount; /* kernel counters for 4 input interrupts */
+	unsigned int timeout;
+
+	int read_status_mask;
+	int ignore_status_mask;
+	unsigned int xmit_fifo_size;
+	int xmit_head;
+	int xmit_tail;
+	int xmit_cnt;
+	int closing;
+
+	struct ktermios normal_termios;
+
+	struct mxser_mon mon_data;
+
+	spinlock_t slock;
+};
+
+struct mxser_board {
+	unsigned int idx;
+	int irq;
+	const struct mxser_cardinfo *info;
+	unsigned long vector;
+	unsigned long vector_mask;
+
+	int chip_flag;
+	int uart_type;
+
+	struct mxser_port ports[MXSER_PORTS_PER_BOARD];
+};
+
+struct mxser_mstatus {
+	tcflag_t cflag;
+	int cts;
+	int dsr;
+	int ri;
+	int dcd;
+};
+
+static struct mxser_board mxser_boards[MXSER_BOARDS];
+static struct tty_driver *mxvar_sdriver;
+static struct mxser_log mxvar_log;
+static int mxser_set_baud_method[MXSER_PORTS + 1];
+
+static void mxser_enable_must_enchance_mode(unsigned long baseio)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr |= MOXA_MUST_EFR_EFRB_ENABLE;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+#ifdef	CONFIG_PCI
+static void mxser_disable_must_enchance_mode(unsigned long baseio)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+#endif
+
+static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_BANK_MASK;
+	efr |= MOXA_MUST_EFR_BANK0;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(value, baseio + MOXA_MUST_XON1_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_BANK_MASK;
+	efr |= MOXA_MUST_EFR_BANK0;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_set_must_fifo_value(struct mxser_port *info)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(info->ioaddr + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
+
+	efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_BANK_MASK;
+	efr |= MOXA_MUST_EFR_BANK1;
+
+	outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
+	outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
+	outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
+	outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
+	outb(oldlcr, info->ioaddr + UART_LCR);
+}
+
+static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_BANK_MASK;
+	efr |= MOXA_MUST_EFR_BANK2;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+#ifdef CONFIG_PCI
+static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_BANK_MASK;
+	efr |= MOXA_MUST_EFR_BANK2;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	*pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+#endif
+
+static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_SF_MASK;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
+	efr |= MOXA_MUST_EFR_SF_TX1;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
+	efr |= MOXA_MUST_EFR_SF_RX1;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
+{
+	u8 oldlcr;
+	u8 efr;
+
+	oldlcr = inb(baseio + UART_LCR);
+	outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+	efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+	efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
+
+	outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+	outb(oldlcr, baseio + UART_LCR);
+}
+
+#ifdef CONFIG_PCI
+static int CheckIsMoxaMust(unsigned long io)
+{
+	u8 oldmcr, hwid;
+	int i;
+
+	outb(0, io + UART_LCR);
+	mxser_disable_must_enchance_mode(io);
+	oldmcr = inb(io + UART_MCR);
+	outb(0, io + UART_MCR);
+	mxser_set_must_xon1_value(io, 0x11);
+	if ((hwid = inb(io + UART_MCR)) != 0) {
+		outb(oldmcr, io + UART_MCR);
+		return MOXA_OTHER_UART;
+	}
+
+	mxser_get_must_hardware_id(io, &hwid);
+	for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
+		if (hwid == Gpci_uart_info[i].type)
+			return (int)hwid;
+	}
+	return MOXA_OTHER_UART;
+}
+#endif
+
+static void process_txrx_fifo(struct mxser_port *info)
+{
+	int i;
+
+	if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
+		info->rx_trigger = 1;
+		info->rx_high_water = 1;
+		info->rx_low_water = 1;
+		info->xmit_fifo_size = 1;
+	} else
+		for (i = 0; i < UART_INFO_NUM; i++)
+			if (info->board->chip_flag == Gpci_uart_info[i].type) {
+				info->rx_trigger = Gpci_uart_info[i].rx_trigger;
+				info->rx_low_water = Gpci_uart_info[i].rx_low_water;
+				info->rx_high_water = Gpci_uart_info[i].rx_high_water;
+				info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
+				break;
+			}
+}
+
+static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
+{
+	static unsigned char mxser_msr[MXSER_PORTS + 1];
+	unsigned char status = 0;
+
+	status = inb(baseaddr + UART_MSR);
+
+	mxser_msr[port] &= 0x0F;
+	mxser_msr[port] |= status;
+	status = mxser_msr[port];
+	if (mode)
+		mxser_msr[port] = 0;
+
+	return status;
+}
+
+static int mxser_carrier_raised(struct tty_port *port)
+{
+	struct mxser_port *mp = container_of(port, struct mxser_port, port);
+	return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
+}
+
+static void mxser_dtr_rts(struct tty_port *port, int on)
+{
+	struct mxser_port *mp = container_of(port, struct mxser_port, port);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mp->slock, flags);
+	if (on)
+		outb(inb(mp->ioaddr + UART_MCR) |
+			UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
+	else
+		outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
+			mp->ioaddr + UART_MCR);
+	spin_unlock_irqrestore(&mp->slock, flags);
+}
+
+static int mxser_set_baud(struct tty_struct *tty, long newspd)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned int quot = 0, baud;
+	unsigned char cval;
+	u64 timeout;
+
+	if (!info->ioaddr)
+		return -1;
+
+	if (newspd > info->max_baud)
+		return -1;
+
+	if (newspd == 134) {
+		quot = 2 * info->baud_base / 269;
+		tty_encode_baud_rate(tty, 134, 134);
+	} else if (newspd) {
+		quot = info->baud_base / newspd;
+		if (quot == 0)
+			quot = 1;
+		baud = info->baud_base/quot;
+		tty_encode_baud_rate(tty, baud, baud);
+	} else {
+		quot = 0;
+	}
+
+	/*
+	 * worst case (128 * 1000 * 10 * 18432) needs 35 bits, so divide in the
+	 * u64 domain
+	 */
+	timeout = (u64)info->xmit_fifo_size * HZ * 10 * quot;
+	do_div(timeout, info->baud_base);
+	info->timeout = timeout + HZ / 50; /* Add .02 seconds of slop */
+
+	if (quot) {
+		info->MCR |= UART_MCR_DTR;
+		outb(info->MCR, info->ioaddr + UART_MCR);
+	} else {
+		info->MCR &= ~UART_MCR_DTR;
+		outb(info->MCR, info->ioaddr + UART_MCR);
+		return 0;
+	}
+
+	cval = inb(info->ioaddr + UART_LCR);
+
+	outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);	/* set DLAB */
+
+	outb(quot & 0xff, info->ioaddr + UART_DLL);	/* LS of divisor */
+	outb(quot >> 8, info->ioaddr + UART_DLM);	/* MS of divisor */
+	outb(cval, info->ioaddr + UART_LCR);	/* reset DLAB */
+
+#ifdef BOTHER
+	if (C_BAUD(tty) == BOTHER) {
+		quot = info->baud_base % newspd;
+		quot *= 8;
+		if (quot % newspd > newspd / 2) {
+			quot /= newspd;
+			quot++;
+		} else
+			quot /= newspd;
+
+		mxser_set_must_enum_value(info->ioaddr, quot);
+	} else
+#endif
+		mxser_set_must_enum_value(info->ioaddr, 0);
+
+	return 0;
+}
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void mxser_change_speed(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned cflag, cval, fcr;
+	unsigned char status;
+
+	cflag = tty->termios.c_cflag;
+	if (!info->ioaddr)
+		return;
+
+	if (mxser_set_baud_method[tty->index] == 0)
+		mxser_set_baud(tty, tty_get_baud_rate(tty));
+
+	/* byte size and parity */
+	switch (cflag & CSIZE) {
+	case CS5:
+		cval = 0x00;
+		break;
+	case CS6:
+		cval = 0x01;
+		break;
+	case CS7:
+		cval = 0x02;
+		break;
+	case CS8:
+		cval = 0x03;
+		break;
+	default:
+		cval = 0x00;
+		break;		/* too keep GCC shut... */
+	}
+	if (cflag & CSTOPB)
+		cval |= 0x04;
+	if (cflag & PARENB)
+		cval |= UART_LCR_PARITY;
+	if (!(cflag & PARODD))
+		cval |= UART_LCR_EPAR;
+	if (cflag & CMSPAR)
+		cval |= UART_LCR_SPAR;
+
+	if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
+		if (info->board->chip_flag) {
+			fcr = UART_FCR_ENABLE_FIFO;
+			fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
+			mxser_set_must_fifo_value(info);
+		} else
+			fcr = 0;
+	} else {
+		fcr = UART_FCR_ENABLE_FIFO;
+		if (info->board->chip_flag) {
+			fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
+			mxser_set_must_fifo_value(info);
+		} else {
+			switch (info->rx_trigger) {
+			case 1:
+				fcr |= UART_FCR_TRIGGER_1;
+				break;
+			case 4:
+				fcr |= UART_FCR_TRIGGER_4;
+				break;
+			case 8:
+				fcr |= UART_FCR_TRIGGER_8;
+				break;
+			default:
+				fcr |= UART_FCR_TRIGGER_14;
+				break;
+			}
+		}
+	}
+
+	/* CTS flow control flag and modem status interrupts */
+	info->IER &= ~UART_IER_MSI;
+	info->MCR &= ~UART_MCR_AFE;
+	tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
+	if (cflag & CRTSCTS) {
+		info->IER |= UART_IER_MSI;
+		if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
+			info->MCR |= UART_MCR_AFE;
+		} else {
+			status = inb(info->ioaddr + UART_MSR);
+			if (tty->hw_stopped) {
+				if (status & UART_MSR_CTS) {
+					tty->hw_stopped = 0;
+					if (info->type != PORT_16550A &&
+							!info->board->chip_flag) {
+						outb(info->IER & ~UART_IER_THRI,
+							info->ioaddr +
+							UART_IER);
+						info->IER |= UART_IER_THRI;
+						outb(info->IER, info->ioaddr +
+								UART_IER);
+					}
+					tty_wakeup(tty);
+				}
+			} else {
+				if (!(status & UART_MSR_CTS)) {
+					tty->hw_stopped = 1;
+					if ((info->type != PORT_16550A) &&
+							(!info->board->chip_flag)) {
+						info->IER &= ~UART_IER_THRI;
+						outb(info->IER, info->ioaddr +
+								UART_IER);
+					}
+				}
+			}
+		}
+	}
+	outb(info->MCR, info->ioaddr + UART_MCR);
+	tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
+	if (~cflag & CLOCAL)
+		info->IER |= UART_IER_MSI;
+	outb(info->IER, info->ioaddr + UART_IER);
+
+	/*
+	 * Set up parity check flag
+	 */
+	info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+	if (I_INPCK(tty))
+		info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+	if (I_BRKINT(tty) || I_PARMRK(tty))
+		info->read_status_mask |= UART_LSR_BI;
+
+	info->ignore_status_mask = 0;
+
+	if (I_IGNBRK(tty)) {
+		info->ignore_status_mask |= UART_LSR_BI;
+		info->read_status_mask |= UART_LSR_BI;
+		/*
+		 * If we're ignore parity and break indicators, ignore
+		 * overruns too.  (For real raw support).
+		 */
+		if (I_IGNPAR(tty)) {
+			info->ignore_status_mask |=
+						UART_LSR_OE |
+						UART_LSR_PE |
+						UART_LSR_FE;
+			info->read_status_mask |=
+						UART_LSR_OE |
+						UART_LSR_PE |
+						UART_LSR_FE;
+		}
+	}
+	if (info->board->chip_flag) {
+		mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
+		mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
+		if (I_IXON(tty)) {
+			mxser_enable_must_rx_software_flow_control(
+					info->ioaddr);
+		} else {
+			mxser_disable_must_rx_software_flow_control(
+					info->ioaddr);
+		}
+		if (I_IXOFF(tty)) {
+			mxser_enable_must_tx_software_flow_control(
+					info->ioaddr);
+		} else {
+			mxser_disable_must_tx_software_flow_control(
+					info->ioaddr);
+		}
+	}
+
+
+	outb(fcr, info->ioaddr + UART_FCR);	/* set fcr */
+	outb(cval, info->ioaddr + UART_LCR);
+}
+
+static void mxser_check_modem_status(struct tty_struct *tty,
+				struct mxser_port *port, int status)
+{
+	/* update input line counters */
+	if (status & UART_MSR_TERI)
+		port->icount.rng++;
+	if (status & UART_MSR_DDSR)
+		port->icount.dsr++;
+	if (status & UART_MSR_DDCD)
+		port->icount.dcd++;
+	if (status & UART_MSR_DCTS)
+		port->icount.cts++;
+	port->mon_data.modem_status = status;
+	wake_up_interruptible(&port->port.delta_msr_wait);
+
+	if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
+		if (status & UART_MSR_DCD)
+			wake_up_interruptible(&port->port.open_wait);
+	}
+
+	if (tty_port_cts_enabled(&port->port)) {
+		if (tty->hw_stopped) {
+			if (status & UART_MSR_CTS) {
+				tty->hw_stopped = 0;
+
+				if ((port->type != PORT_16550A) &&
+						(!port->board->chip_flag)) {
+					outb(port->IER & ~UART_IER_THRI,
+						port->ioaddr + UART_IER);
+					port->IER |= UART_IER_THRI;
+					outb(port->IER, port->ioaddr +
+							UART_IER);
+				}
+				tty_wakeup(tty);
+			}
+		} else {
+			if (!(status & UART_MSR_CTS)) {
+				tty->hw_stopped = 1;
+				if (port->type != PORT_16550A &&
+						!port->board->chip_flag) {
+					port->IER &= ~UART_IER_THRI;
+					outb(port->IER, port->ioaddr +
+							UART_IER);
+				}
+			}
+		}
+	}
+}
+
+static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
+{
+	struct mxser_port *info = container_of(port, struct mxser_port, port);
+	unsigned long page;
+	unsigned long flags;
+	int ret;
+
+	page = __get_free_page(GFP_KERNEL);
+	if (!page)
+		return -ENOMEM;
+
+	spin_lock_irqsave(&info->slock, flags);
+
+	if (!info->ioaddr || !info->type) {
+		set_bit(TTY_IO_ERROR, &tty->flags);
+		spin_unlock_irqrestore(&info->slock, flags);
+		ret = 0;
+		goto err_free_xmit;
+	}
+	info->port.xmit_buf = (unsigned char *) page;
+
+	/*
+	 * Clear the FIFO buffers and disable them
+	 * (they will be reenabled in mxser_change_speed())
+	 */
+	if (info->board->chip_flag)
+		outb((UART_FCR_CLEAR_RCVR |
+			UART_FCR_CLEAR_XMIT |
+			MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
+	else
+		outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
+			info->ioaddr + UART_FCR);
+
+	/*
+	 * At this point there's no way the LSR could still be 0xFF;
+	 * if it is, then bail out, because there's likely no UART
+	 * here.
+	 */
+	if (inb(info->ioaddr + UART_LSR) == 0xff) {
+		spin_unlock_irqrestore(&info->slock, flags);
+		if (capable(CAP_SYS_ADMIN)) {
+			set_bit(TTY_IO_ERROR, &tty->flags);
+			return 0;
+		}
+
+		ret = -ENODEV;
+		goto err_free_xmit;
+	}
+
+	/*
+	 * Clear the interrupt registers.
+	 */
+	(void) inb(info->ioaddr + UART_LSR);
+	(void) inb(info->ioaddr + UART_RX);
+	(void) inb(info->ioaddr + UART_IIR);
+	(void) inb(info->ioaddr + UART_MSR);
+
+	/*
+	 * Now, initialize the UART
+	 */
+	outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);	/* reset DLAB */
+	info->MCR = UART_MCR_DTR | UART_MCR_RTS;
+	outb(info->MCR, info->ioaddr + UART_MCR);
+
+	/*
+	 * Finally, enable interrupts
+	 */
+	info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
+
+	if (info->board->chip_flag)
+		info->IER |= MOXA_MUST_IER_EGDAI;
+	outb(info->IER, info->ioaddr + UART_IER);	/* enable interrupts */
+
+	/*
+	 * And clear the interrupt registers again for luck.
+	 */
+	(void) inb(info->ioaddr + UART_LSR);
+	(void) inb(info->ioaddr + UART_RX);
+	(void) inb(info->ioaddr + UART_IIR);
+	(void) inb(info->ioaddr + UART_MSR);
+
+	clear_bit(TTY_IO_ERROR, &tty->flags);
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+	/*
+	 * and set the speed of the serial port
+	 */
+	mxser_change_speed(tty);
+	spin_unlock_irqrestore(&info->slock, flags);
+
+	return 0;
+err_free_xmit:
+	free_page(page);
+	info->port.xmit_buf = NULL;
+	return ret;
+}
+
+/*
+ * This routine will shutdown a serial port
+ */
+static void mxser_shutdown_port(struct tty_port *port)
+{
+	struct mxser_port *info = container_of(port, struct mxser_port, port);
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->slock, flags);
+
+	/*
+	 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
+	 * here so the queue might never be waken up
+	 */
+	wake_up_interruptible(&info->port.delta_msr_wait);
+
+	/*
+	 * Free the xmit buffer, if necessary
+	 */
+	if (info->port.xmit_buf) {
+		free_page((unsigned long) info->port.xmit_buf);
+		info->port.xmit_buf = NULL;
+	}
+
+	info->IER = 0;
+	outb(0x00, info->ioaddr + UART_IER);
+
+	/* clear Rx/Tx FIFO's */
+	if (info->board->chip_flag)
+		outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
+				MOXA_MUST_FCR_GDA_MODE_ENABLE,
+				info->ioaddr + UART_FCR);
+	else
+		outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+			info->ioaddr + UART_FCR);
+
+	/* read data port to reset things */
+	(void) inb(info->ioaddr + UART_RX);
+
+
+	if (info->board->chip_flag)
+		SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
+
+	spin_unlock_irqrestore(&info->slock, flags);
+}
+
+/*
+ * This routine is called whenever a serial port is opened.  It
+ * enables interrupts for a serial port, linking in its async structure into
+ * the IRQ chain.   It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+static int mxser_open(struct tty_struct *tty, struct file *filp)
+{
+	struct mxser_port *info;
+	int line;
+
+	line = tty->index;
+	if (line == MXSER_PORTS)
+		return 0;
+	info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
+	if (!info->ioaddr)
+		return -ENODEV;
+
+	tty->driver_data = info;
+	return tty_port_open(&info->port, tty, filp);
+}
+
+static void mxser_flush_buffer(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+	char fcr;
+	unsigned long flags;
+
+
+	spin_lock_irqsave(&info->slock, flags);
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+	fcr = inb(info->ioaddr + UART_FCR);
+	outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
+		info->ioaddr + UART_FCR);
+	outb(fcr, info->ioaddr + UART_FCR);
+
+	spin_unlock_irqrestore(&info->slock, flags);
+
+	tty_wakeup(tty);
+}
+
+
+static void mxser_close_port(struct tty_port *port)
+{
+	struct mxser_port *info = container_of(port, struct mxser_port, port);
+	unsigned long timeout;
+	/*
+	 * At this point we stop accepting input.  To do this, we
+	 * disable the receive line status interrupts, and tell the
+	 * interrupt driver to stop checking the data ready bit in the
+	 * line status register.
+	 */
+	info->IER &= ~UART_IER_RLSI;
+	if (info->board->chip_flag)
+		info->IER &= ~MOXA_MUST_RECV_ISR;
+
+	outb(info->IER, info->ioaddr + UART_IER);
+	/*
+	 * Before we drop DTR, make sure the UART transmitter
+	 * has completely drained; this is especially
+	 * important if there is a transmit FIFO!
+	 */
+	timeout = jiffies + HZ;
+	while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
+		schedule_timeout_interruptible(5);
+		if (time_after(jiffies, timeout))
+			break;
+	}
+}
+
+/*
+ * This routine is called when the serial port gets closed.  First, we
+ * wait for the last remaining data to be sent.  Then, we unlink its
+ * async structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ */
+static void mxser_close(struct tty_struct *tty, struct file *filp)
+{
+	struct mxser_port *info = tty->driver_data;
+	struct tty_port *port = &info->port;
+
+	if (tty->index == MXSER_PORTS || info == NULL)
+		return;
+	if (tty_port_close_start(port, tty, filp) == 0)
+		return;
+	info->closing = 1;
+	mutex_lock(&port->mutex);
+	mxser_close_port(port);
+	mxser_flush_buffer(tty);
+	if (tty_port_initialized(port) && C_HUPCL(tty))
+		tty_port_lower_dtr_rts(port);
+	mxser_shutdown_port(port);
+	tty_port_set_initialized(port, 0);
+	mutex_unlock(&port->mutex);
+	info->closing = 0;
+	/* Right now the tty_port set is done outside of the close_end helper
+	   as we don't yet have everyone using refcounts */	
+	tty_port_close_end(port, tty);
+	tty_port_tty_set(port, NULL);
+}
+
+static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+	int c, total = 0;
+	struct mxser_port *info = tty->driver_data;
+	unsigned long flags;
+
+	if (!info->port.xmit_buf)
+		return 0;
+
+	while (1) {
+		c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+					  SERIAL_XMIT_SIZE - info->xmit_head));
+		if (c <= 0)
+			break;
+
+		memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
+		spin_lock_irqsave(&info->slock, flags);
+		info->xmit_head = (info->xmit_head + c) &
+				  (SERIAL_XMIT_SIZE - 1);
+		info->xmit_cnt += c;
+		spin_unlock_irqrestore(&info->slock, flags);
+
+		buf += c;
+		count -= c;
+		total += c;
+	}
+
+	if (info->xmit_cnt && !tty->stopped) {
+		if (!tty->hw_stopped ||
+				(info->type == PORT_16550A) ||
+				(info->board->chip_flag)) {
+			spin_lock_irqsave(&info->slock, flags);
+			outb(info->IER & ~UART_IER_THRI, info->ioaddr +
+					UART_IER);
+			info->IER |= UART_IER_THRI;
+			outb(info->IER, info->ioaddr + UART_IER);
+			spin_unlock_irqrestore(&info->slock, flags);
+		}
+	}
+	return total;
+}
+
+static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned long flags;
+
+	if (!info->port.xmit_buf)
+		return 0;
+
+	if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
+		return 0;
+
+	spin_lock_irqsave(&info->slock, flags);
+	info->port.xmit_buf[info->xmit_head++] = ch;
+	info->xmit_head &= SERIAL_XMIT_SIZE - 1;
+	info->xmit_cnt++;
+	spin_unlock_irqrestore(&info->slock, flags);
+	if (!tty->stopped) {
+		if (!tty->hw_stopped ||
+				(info->type == PORT_16550A) ||
+				info->board->chip_flag) {
+			spin_lock_irqsave(&info->slock, flags);
+			outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
+			info->IER |= UART_IER_THRI;
+			outb(info->IER, info->ioaddr + UART_IER);
+			spin_unlock_irqrestore(&info->slock, flags);
+		}
+	}
+	return 1;
+}
+
+
+static void mxser_flush_chars(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned long flags;
+
+	if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
+			(tty->hw_stopped && info->type != PORT_16550A &&
+			 !info->board->chip_flag))
+		return;
+
+	spin_lock_irqsave(&info->slock, flags);
+
+	outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
+	info->IER |= UART_IER_THRI;
+	outb(info->IER, info->ioaddr + UART_IER);
+
+	spin_unlock_irqrestore(&info->slock, flags);
+}
+
+static int mxser_write_room(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+	int ret;
+
+	ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+	return ret < 0 ? 0 : ret;
+}
+
+static int mxser_chars_in_buffer(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+	return info->xmit_cnt;
+}
+
+/*
+ * ------------------------------------------------------------
+ * friends of mxser_ioctl()
+ * ------------------------------------------------------------
+ */
+static int mxser_get_serial_info(struct tty_struct *tty,
+		struct serial_struct *ss)
+{
+	struct mxser_port *info = tty->driver_data;
+	struct tty_port *port = &info->port;
+
+	if (tty->index == MXSER_PORTS)
+		return -ENOTTY;
+
+	mutex_lock(&port->mutex);
+	ss->type = info->type,
+	ss->line = tty->index,
+	ss->port = info->ioaddr,
+	ss->irq = info->board->irq,
+	ss->flags = info->port.flags,
+	ss->baud_base = info->baud_base,
+	ss->close_delay = info->port.close_delay,
+	ss->closing_wait = info->port.closing_wait,
+	ss->custom_divisor = info->custom_divisor,
+	mutex_unlock(&port->mutex);
+	return 0;
+}
+
+static int mxser_set_serial_info(struct tty_struct *tty,
+		struct serial_struct *ss)
+{
+	struct mxser_port *info = tty->driver_data;
+	struct tty_port *port = &info->port;
+	speed_t baud;
+	unsigned long sl_flags;
+	unsigned int flags;
+	int retval = 0;
+
+	if (tty->index == MXSER_PORTS)
+		return -ENOTTY;
+	if (tty_io_error(tty))
+		return -EIO;
+
+	mutex_lock(&port->mutex);
+	if (!info->ioaddr) {
+		mutex_unlock(&port->mutex);
+		return -ENODEV;
+	}
+
+	if (ss->irq != info->board->irq ||
+			ss->port != info->ioaddr) {
+		mutex_unlock(&port->mutex);
+		return -EINVAL;
+	}
+
+	flags = port->flags & ASYNC_SPD_MASK;
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		if ((ss->baud_base != info->baud_base) ||
+				(ss->close_delay != info->port.close_delay) ||
+				((ss->flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK))) {
+			mutex_unlock(&port->mutex);
+			return -EPERM;
+		}
+		info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
+				(ss->flags & ASYNC_USR_MASK));
+	} else {
+		/*
+		 * OK, past this point, all the error checking has been done.
+		 * At this point, we start making changes.....
+		 */
+		port->flags = ((port->flags & ~ASYNC_FLAGS) |
+				(ss->flags & ASYNC_FLAGS));
+		port->close_delay = ss->close_delay * HZ / 100;
+		port->closing_wait = ss->closing_wait * HZ / 100;
+		port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
+				(ss->baud_base != info->baud_base ||
+				ss->custom_divisor !=
+				info->custom_divisor)) {
+			if (ss->custom_divisor == 0) {
+				mutex_unlock(&port->mutex);
+				return -EINVAL;
+			}
+			baud = ss->baud_base / ss->custom_divisor;
+			tty_encode_baud_rate(tty, baud, baud);
+		}
+	}
+
+	info->type = ss->type;
+
+	process_txrx_fifo(info);
+
+	if (tty_port_initialized(port)) {
+		if (flags != (port->flags & ASYNC_SPD_MASK)) {
+			spin_lock_irqsave(&info->slock, sl_flags);
+			mxser_change_speed(tty);
+			spin_unlock_irqrestore(&info->slock, sl_flags);
+		}
+	} else {
+		retval = mxser_activate(port, tty);
+		if (retval == 0)
+			tty_port_set_initialized(port, 1);
+	}
+	mutex_unlock(&port->mutex);
+	return retval;
+}
+
+/*
+ * mxser_get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *	    is emptied.  On bus types like RS485, the transmitter must
+ *	    release the bus after transmitting. This must be done when
+ *	    the transmit shift register is empty, not be done when the
+ *	    transmit holding register is empty.  This functionality
+ *	    allows an RS485 driver to be written in user space.
+ */
+static int mxser_get_lsr_info(struct mxser_port *info,
+		unsigned int __user *value)
+{
+	unsigned char status;
+	unsigned int result;
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->slock, flags);
+	status = inb(info->ioaddr + UART_LSR);
+	spin_unlock_irqrestore(&info->slock, flags);
+	result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
+	return put_user(result, value);
+}
+
+static int mxser_tiocmget(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned char control, status;
+	unsigned long flags;
+
+
+	if (tty->index == MXSER_PORTS)
+		return -ENOIOCTLCMD;
+	if (tty_io_error(tty))
+		return -EIO;
+
+	control = info->MCR;
+
+	spin_lock_irqsave(&info->slock, flags);
+	status = inb(info->ioaddr + UART_MSR);
+	if (status & UART_MSR_ANY_DELTA)
+		mxser_check_modem_status(tty, info, status);
+	spin_unlock_irqrestore(&info->slock, flags);
+	return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
+		    ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
+		    ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
+		    ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
+		    ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
+		    ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
+}
+
+static int mxser_tiocmset(struct tty_struct *tty,
+		unsigned int set, unsigned int clear)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned long flags;
+
+
+	if (tty->index == MXSER_PORTS)
+		return -ENOIOCTLCMD;
+	if (tty_io_error(tty))
+		return -EIO;
+
+	spin_lock_irqsave(&info->slock, flags);
+
+	if (set & TIOCM_RTS)
+		info->MCR |= UART_MCR_RTS;
+	if (set & TIOCM_DTR)
+		info->MCR |= UART_MCR_DTR;
+
+	if (clear & TIOCM_RTS)
+		info->MCR &= ~UART_MCR_RTS;
+	if (clear & TIOCM_DTR)
+		info->MCR &= ~UART_MCR_DTR;
+
+	outb(info->MCR, info->ioaddr + UART_MCR);
+	spin_unlock_irqrestore(&info->slock, flags);
+	return 0;
+}
+
+static int __init mxser_program_mode(int port)
+{
+	int id, i, j, n;
+
+	outb(0, port);
+	outb(0, port);
+	outb(0, port);
+	(void)inb(port);
+	(void)inb(port);
+	outb(0, port);
+	(void)inb(port);
+
+	id = inb(port + 1) & 0x1F;
+	if ((id != C168_ASIC_ID) &&
+			(id != C104_ASIC_ID) &&
+			(id != C102_ASIC_ID) &&
+			(id != CI132_ASIC_ID) &&
+			(id != CI134_ASIC_ID) &&
+			(id != CI104J_ASIC_ID))
+		return -1;
+	for (i = 0, j = 0; i < 4; i++) {
+		n = inb(port + 2);
+		if (n == 'M') {
+			j = 1;
+		} else if ((j == 1) && (n == 1)) {
+			j = 2;
+			break;
+		} else
+			j = 0;
+	}
+	if (j != 2)
+		id = -2;
+	return id;
+}
+
+static void __init mxser_normal_mode(int port)
+{
+	int i, n;
+
+	outb(0xA5, port + 1);
+	outb(0x80, port + 3);
+	outb(12, port + 0);	/* 9600 bps */
+	outb(0, port + 1);
+	outb(0x03, port + 3);	/* 8 data bits */
+	outb(0x13, port + 4);	/* loop back mode */
+	for (i = 0; i < 16; i++) {
+		n = inb(port + 5);
+		if ((n & 0x61) == 0x60)
+			break;
+		if ((n & 1) == 1)
+			(void)inb(port);
+	}
+	outb(0x00, port + 4);
+}
+
+#define CHIP_SK 	0x01	/* Serial Data Clock  in Eprom */
+#define CHIP_DO 	0x02	/* Serial Data Output in Eprom */
+#define CHIP_CS 	0x04	/* Serial Chip Select in Eprom */
+#define CHIP_DI 	0x08	/* Serial Data Input  in Eprom */
+#define EN_CCMD 	0x000	/* Chip's command register     */
+#define EN0_RSARLO	0x008	/* Remote start address reg 0  */
+#define EN0_RSARHI	0x009	/* Remote start address reg 1  */
+#define EN0_RCNTLO	0x00A	/* Remote byte count reg WR    */
+#define EN0_RCNTHI	0x00B	/* Remote byte count reg WR    */
+#define EN0_DCFG	0x00E	/* Data configuration reg WR   */
+#define EN0_PORT	0x010	/* Rcv missed frame error counter RD */
+#define ENC_PAGE0	0x000	/* Select page 0 of chip registers   */
+#define ENC_PAGE3	0x0C0	/* Select page 3 of chip registers   */
+static int __init mxser_read_register(int port, unsigned short *regs)
+{
+	int i, k, value, id;
+	unsigned int j;
+
+	id = mxser_program_mode(port);
+	if (id < 0)
+		return id;
+	for (i = 0; i < 14; i++) {
+		k = (i & 0x3F) | 0x180;
+		for (j = 0x100; j > 0; j >>= 1) {
+			outb(CHIP_CS, port);
+			if (k & j) {
+				outb(CHIP_CS | CHIP_DO, port);
+				outb(CHIP_CS | CHIP_DO | CHIP_SK, port);	/* A? bit of read */
+			} else {
+				outb(CHIP_CS, port);
+				outb(CHIP_CS | CHIP_SK, port);	/* A? bit of read */
+			}
+		}
+		(void)inb(port);
+		value = 0;
+		for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
+			outb(CHIP_CS, port);
+			outb(CHIP_CS | CHIP_SK, port);
+			if (inb(port) & CHIP_DI)
+				value |= j;
+		}
+		regs[i] = value;
+		outb(0, port);
+	}
+	mxser_normal_mode(port);
+	return id;
+}
+
+static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
+{
+	struct mxser_port *ip;
+	struct tty_port *port;
+	struct tty_struct *tty;
+	int result, status;
+	unsigned int i, j;
+	int ret = 0;
+
+	switch (cmd) {
+	case MOXA_GET_MAJOR:
+		printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
+					"%x (GET_MAJOR), fix your userspace\n",
+					current->comm, cmd);
+		return put_user(ttymajor, (int __user *)argp);
+
+	case MOXA_CHKPORTENABLE:
+		result = 0;
+		for (i = 0; i < MXSER_BOARDS; i++)
+			for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
+				if (mxser_boards[i].ports[j].ioaddr)
+					result |= (1 << i);
+		return put_user(result, (unsigned long __user *)argp);
+	case MOXA_GETDATACOUNT:
+		/* The receive side is locked by port->slock but it isn't
+		   clear that an exact snapshot is worth copying here */
+		if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
+			ret = -EFAULT;
+		return ret;
+	case MOXA_GETMSTATUS: {
+		struct mxser_mstatus ms, __user *msu = argp;
+		for (i = 0; i < MXSER_BOARDS; i++)
+			for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
+				ip = &mxser_boards[i].ports[j];
+				port = &ip->port;
+				memset(&ms, 0, sizeof(ms));
+
+				mutex_lock(&port->mutex);
+				if (!ip->ioaddr)
+					goto copy;
+				
+				tty = tty_port_tty_get(port);
+
+				if (!tty)
+					ms.cflag = ip->normal_termios.c_cflag;
+				else
+					ms.cflag = tty->termios.c_cflag;
+				tty_kref_put(tty);
+				spin_lock_irq(&ip->slock);
+				status = inb(ip->ioaddr + UART_MSR);
+				spin_unlock_irq(&ip->slock);
+				if (status & UART_MSR_DCD)
+					ms.dcd = 1;
+				if (status & UART_MSR_DSR)
+					ms.dsr = 1;
+				if (status & UART_MSR_CTS)
+					ms.cts = 1;
+			copy:
+				mutex_unlock(&port->mutex);
+				if (copy_to_user(msu, &ms, sizeof(ms)))
+					return -EFAULT;
+				msu++;
+			}
+		return 0;
+	}
+	case MOXA_ASPP_MON_EXT: {
+		struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
+		unsigned int cflag, iflag, p;
+		u8 opmode;
+
+		me = kzalloc(sizeof(*me), GFP_KERNEL);
+		if (!me)
+			return -ENOMEM;
+
+		for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
+			for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
+				if (p >= ARRAY_SIZE(me->rx_cnt)) {
+					i = MXSER_BOARDS;
+					break;
+				}
+				ip = &mxser_boards[i].ports[j];
+				port = &ip->port;
+
+				mutex_lock(&port->mutex);
+				if (!ip->ioaddr) {
+					mutex_unlock(&port->mutex);
+					continue;
+				}
+
+				spin_lock_irq(&ip->slock);
+				status = mxser_get_msr(ip->ioaddr, 0, p);
+
+				if (status & UART_MSR_TERI)
+					ip->icount.rng++;
+				if (status & UART_MSR_DDSR)
+					ip->icount.dsr++;
+				if (status & UART_MSR_DDCD)
+					ip->icount.dcd++;
+				if (status & UART_MSR_DCTS)
+					ip->icount.cts++;
+
+				ip->mon_data.modem_status = status;
+				me->rx_cnt[p] = ip->mon_data.rxcnt;
+				me->tx_cnt[p] = ip->mon_data.txcnt;
+				me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
+				me->up_txcnt[p] = ip->mon_data.up_txcnt;
+				me->modem_status[p] =
+					ip->mon_data.modem_status;
+				spin_unlock_irq(&ip->slock);
+
+				tty = tty_port_tty_get(&ip->port);
+
+				if (!tty) {
+					cflag = ip->normal_termios.c_cflag;
+					iflag = ip->normal_termios.c_iflag;
+					me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
+				} else {
+					cflag = tty->termios.c_cflag;
+					iflag = tty->termios.c_iflag;
+					me->baudrate[p] = tty_get_baud_rate(tty);
+				}
+				tty_kref_put(tty);
+
+				me->databits[p] = cflag & CSIZE;
+				me->stopbits[p] = cflag & CSTOPB;
+				me->parity[p] = cflag & (PARENB | PARODD |
+						CMSPAR);
+
+				if (cflag & CRTSCTS)
+					me->flowctrl[p] |= 0x03;
+
+				if (iflag & (IXON | IXOFF))
+					me->flowctrl[p] |= 0x0C;
+
+				if (ip->type == PORT_16550A)
+					me->fifo[p] = 1;
+
+				if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
+					opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
+					opmode &= OP_MODE_MASK;
+				} else {
+					opmode = RS232_MODE;
+				}
+				me->iftype[p] = opmode;
+				mutex_unlock(&port->mutex);
+			}
+		}
+		if (copy_to_user(argp, me, sizeof(*me)))
+			ret = -EFAULT;
+		kfree(me);
+		return ret;
+	}
+	default:
+		return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
+		struct async_icount *cprev)
+{
+	struct async_icount cnow;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&info->slock, flags);
+	cnow = info->icount;	/* atomic copy */
+	spin_unlock_irqrestore(&info->slock, flags);
+
+	ret =	((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
+		((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
+		((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
+		((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
+
+	*cprev = cnow;
+
+	return ret;
+}
+
+static int mxser_ioctl(struct tty_struct *tty,
+		unsigned int cmd, unsigned long arg)
+{
+	struct mxser_port *info = tty->driver_data;
+	struct async_icount cnow;
+	unsigned long flags;
+	void __user *argp = (void __user *)arg;
+
+	if (tty->index == MXSER_PORTS)
+		return mxser_ioctl_special(cmd, argp);
+
+	if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
+		int p;
+		unsigned long opmode;
+		static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
+		int shiftbit;
+		unsigned char val, mask;
+
+		if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
+			return -EFAULT;
+
+		p = tty->index % 4;
+		if (cmd == MOXA_SET_OP_MODE) {
+			if (get_user(opmode, (int __user *) argp))
+				return -EFAULT;
+			if (opmode != RS232_MODE &&
+					opmode != RS485_2WIRE_MODE &&
+					opmode != RS422_MODE &&
+					opmode != RS485_4WIRE_MODE)
+				return -EFAULT;
+			mask = ModeMask[p];
+			shiftbit = p * 2;
+			spin_lock_irq(&info->slock);
+			val = inb(info->opmode_ioaddr);
+			val &= mask;
+			val |= (opmode << shiftbit);
+			outb(val, info->opmode_ioaddr);
+			spin_unlock_irq(&info->slock);
+		} else {
+			shiftbit = p * 2;
+			spin_lock_irq(&info->slock);
+			opmode = inb(info->opmode_ioaddr) >> shiftbit;
+			spin_unlock_irq(&info->slock);
+			opmode &= OP_MODE_MASK;
+			if (put_user(opmode, (int __user *)argp))
+				return -EFAULT;
+		}
+		return 0;
+	}
+
+	if (cmd != TIOCMIWAIT && tty_io_error(tty))
+		return -EIO;
+
+	switch (cmd) {
+	case TIOCSERGETLSR:	/* Get line status register */
+		return  mxser_get_lsr_info(info, argp);
+		/*
+		 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+		 * - mask passed in arg for lines of interest
+		 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+		 * Caller should use TIOCGICOUNT to see which one it was
+		 */
+	case TIOCMIWAIT:
+		spin_lock_irqsave(&info->slock, flags);
+		cnow = info->icount;	/* note the counters on entry */
+		spin_unlock_irqrestore(&info->slock, flags);
+
+		return wait_event_interruptible(info->port.delta_msr_wait,
+				mxser_cflags_changed(info, arg, &cnow));
+	case MOXA_HighSpeedOn:
+		return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
+	case MOXA_SDS_RSTICOUNTER:
+		spin_lock_irq(&info->slock);
+		info->mon_data.rxcnt = 0;
+		info->mon_data.txcnt = 0;
+		spin_unlock_irq(&info->slock);
+		return 0;
+
+	case MOXA_ASPP_OQUEUE:{
+		int len, lsr;
+
+		len = mxser_chars_in_buffer(tty);
+		spin_lock_irq(&info->slock);
+		lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
+		spin_unlock_irq(&info->slock);
+		len += (lsr ? 0 : 1);
+
+		return put_user(len, (int __user *)argp);
+	}
+	case MOXA_ASPP_MON: {
+		int mcr, status;
+
+		spin_lock_irq(&info->slock);
+		status = mxser_get_msr(info->ioaddr, 1, tty->index);
+		mxser_check_modem_status(tty, info, status);
+
+		mcr = inb(info->ioaddr + UART_MCR);
+		spin_unlock_irq(&info->slock);
+
+		if (mcr & MOXA_MUST_MCR_XON_FLAG)
+			info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
+		else
+			info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
+
+		if (mcr & MOXA_MUST_MCR_TX_XON)
+			info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
+		else
+			info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
+
+		if (tty->hw_stopped)
+			info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
+		else
+			info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
+
+		if (copy_to_user(argp, &info->mon_data,
+				sizeof(struct mxser_mon)))
+			return -EFAULT;
+
+		return 0;
+	}
+	case MOXA_ASPP_LSTATUS: {
+		if (put_user(info->err_shadow, (unsigned char __user *)argp))
+			return -EFAULT;
+
+		info->err_shadow = 0;
+		return 0;
+	}
+	case MOXA_SET_BAUD_METHOD: {
+		int method;
+
+		if (get_user(method, (int __user *)argp))
+			return -EFAULT;
+		mxser_set_baud_method[tty->index] = method;
+		return put_user(method, (int __user *)argp);
+	}
+	default:
+		return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+	/*
+	 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+	 * Return: write counters to the user passed counter struct
+	 * NB: both 1->0 and 0->1 transitions are counted except for
+	 *     RI where only 0->1 is counted.
+	 */
+
+static int mxser_get_icount(struct tty_struct *tty,
+		struct serial_icounter_struct *icount)
+
+{
+	struct mxser_port *info = tty->driver_data;
+	struct async_icount cnow;
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->slock, flags);
+	cnow = info->icount;
+	spin_unlock_irqrestore(&info->slock, flags);
+
+	icount->frame = cnow.frame;
+	icount->brk = cnow.brk;
+	icount->overrun = cnow.overrun;
+	icount->buf_overrun = cnow.buf_overrun;
+	icount->parity = cnow.parity;
+	icount->rx = cnow.rx;
+	icount->tx = cnow.tx;
+	icount->cts = cnow.cts;
+	icount->dsr = cnow.dsr;
+	icount->rng = cnow.rng;
+	icount->dcd = cnow.dcd;
+	return 0;
+}
+
+static void mxser_stoprx(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+
+	info->ldisc_stop_rx = 1;
+	if (I_IXOFF(tty)) {
+		if (info->board->chip_flag) {
+			info->IER &= ~MOXA_MUST_RECV_ISR;
+			outb(info->IER, info->ioaddr + UART_IER);
+		} else {
+			info->x_char = STOP_CHAR(tty);
+			outb(0, info->ioaddr + UART_IER);
+			info->IER |= UART_IER_THRI;
+			outb(info->IER, info->ioaddr + UART_IER);
+		}
+	}
+
+	if (C_CRTSCTS(tty)) {
+		info->MCR &= ~UART_MCR_RTS;
+		outb(info->MCR, info->ioaddr + UART_MCR);
+	}
+}
+
+/*
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ */
+static void mxser_throttle(struct tty_struct *tty)
+{
+	mxser_stoprx(tty);
+}
+
+static void mxser_unthrottle(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+
+	/* startrx */
+	info->ldisc_stop_rx = 0;
+	if (I_IXOFF(tty)) {
+		if (info->x_char)
+			info->x_char = 0;
+		else {
+			if (info->board->chip_flag) {
+				info->IER |= MOXA_MUST_RECV_ISR;
+				outb(info->IER, info->ioaddr + UART_IER);
+			} else {
+				info->x_char = START_CHAR(tty);
+				outb(0, info->ioaddr + UART_IER);
+				info->IER |= UART_IER_THRI;
+				outb(info->IER, info->ioaddr + UART_IER);
+			}
+		}
+	}
+
+	if (C_CRTSCTS(tty)) {
+		info->MCR |= UART_MCR_RTS;
+		outb(info->MCR, info->ioaddr + UART_MCR);
+	}
+}
+
+/*
+ * mxser_stop() and mxser_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ */
+static void mxser_stop(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->slock, flags);
+	if (info->IER & UART_IER_THRI) {
+		info->IER &= ~UART_IER_THRI;
+		outb(info->IER, info->ioaddr + UART_IER);
+	}
+	spin_unlock_irqrestore(&info->slock, flags);
+}
+
+static void mxser_start(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->slock, flags);
+	if (info->xmit_cnt && info->port.xmit_buf) {
+		outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
+		info->IER |= UART_IER_THRI;
+		outb(info->IER, info->ioaddr + UART_IER);
+	}
+	spin_unlock_irqrestore(&info->slock, flags);
+}
+
+static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->slock, flags);
+	mxser_change_speed(tty);
+	spin_unlock_irqrestore(&info->slock, flags);
+
+	if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
+		tty->hw_stopped = 0;
+		mxser_start(tty);
+	}
+
+	/* Handle sw stopped */
+	if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
+		tty->stopped = 0;
+
+		if (info->board->chip_flag) {
+			spin_lock_irqsave(&info->slock, flags);
+			mxser_disable_must_rx_software_flow_control(
+					info->ioaddr);
+			spin_unlock_irqrestore(&info->slock, flags);
+		}
+
+		mxser_start(tty);
+	}
+}
+
+/*
+ * mxser_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned long orig_jiffies, char_time;
+	unsigned long flags;
+	int lsr;
+
+	if (info->type == PORT_UNKNOWN)
+		return;
+
+	if (info->xmit_fifo_size == 0)
+		return;		/* Just in case.... */
+
+	orig_jiffies = jiffies;
+	/*
+	 * Set the check interval to be 1/5 of the estimated time to
+	 * send a single character, and make it at least 1.  The check
+	 * interval should also be less than the timeout.
+	 *
+	 * Note: we have to use pretty tight timings here to satisfy
+	 * the NIST-PCTS.
+	 */
+	char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
+	char_time = char_time / 5;
+	if (char_time == 0)
+		char_time = 1;
+	if (timeout && timeout < char_time)
+		char_time = timeout;
+	/*
+	 * If the transmitter hasn't cleared in twice the approximate
+	 * amount of time to send the entire FIFO, it probably won't
+	 * ever clear.  This assumes the UART isn't doing flow
+	 * control, which is currently the case.  Hence, if it ever
+	 * takes longer than info->timeout, this is probably due to a
+	 * UART bug of some kind.  So, we clamp the timeout parameter at
+	 * 2*info->timeout.
+	 */
+	if (!timeout || timeout > 2 * info->timeout)
+		timeout = 2 * info->timeout;
+
+	spin_lock_irqsave(&info->slock, flags);
+	while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
+		spin_unlock_irqrestore(&info->slock, flags);
+		schedule_timeout_interruptible(char_time);
+		spin_lock_irqsave(&info->slock, flags);
+		if (signal_pending(current))
+			break;
+		if (timeout && time_after(jiffies, orig_jiffies + timeout))
+			break;
+	}
+	spin_unlock_irqrestore(&info->slock, flags);
+	set_current_state(TASK_RUNNING);
+}
+
+/*
+ * This routine is called by tty_hangup() when a hangup is signaled.
+ */
+static void mxser_hangup(struct tty_struct *tty)
+{
+	struct mxser_port *info = tty->driver_data;
+
+	mxser_flush_buffer(tty);
+	tty_port_hangup(&info->port);
+}
+
+/*
+ * mxser_rs_break() --- routine which turns the break handling on or off
+ */
+static int mxser_rs_break(struct tty_struct *tty, int break_state)
+{
+	struct mxser_port *info = tty->driver_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&info->slock, flags);
+	if (break_state == -1)
+		outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
+			info->ioaddr + UART_LCR);
+	else
+		outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
+			info->ioaddr + UART_LCR);
+	spin_unlock_irqrestore(&info->slock, flags);
+	return 0;
+}
+
+static void mxser_receive_chars(struct tty_struct *tty,
+				struct mxser_port *port, int *status)
+{
+	unsigned char ch, gdl;
+	int ignored = 0;
+	int cnt = 0;
+	int recv_room;
+	int max = 256;
+
+	recv_room = tty->receive_room;
+	if (recv_room == 0 && !port->ldisc_stop_rx)
+		mxser_stoprx(tty);
+	if (port->board->chip_flag != MOXA_OTHER_UART) {
+
+		if (*status & UART_LSR_SPECIAL)
+			goto intr_old;
+		if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
+				(*status & MOXA_MUST_LSR_RERR))
+			goto intr_old;
+		if (*status & MOXA_MUST_LSR_RERR)
+			goto intr_old;
+
+		gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
+
+		if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
+			gdl &= MOXA_MUST_GDL_MASK;
+		if (gdl >= recv_room) {
+			if (!port->ldisc_stop_rx)
+				mxser_stoprx(tty);
+		}
+		while (gdl--) {
+			ch = inb(port->ioaddr + UART_RX);
+			tty_insert_flip_char(&port->port, ch, 0);
+			cnt++;
+		}
+		goto end_intr;
+	}
+intr_old:
+
+	do {
+		if (max-- < 0)
+			break;
+
+		ch = inb(port->ioaddr + UART_RX);
+		if (port->board->chip_flag && (*status & UART_LSR_OE))
+			outb(0x23, port->ioaddr + UART_FCR);
+		*status &= port->read_status_mask;
+		if (*status & port->ignore_status_mask) {
+			if (++ignored > 100)
+				break;
+		} else {
+			char flag = 0;
+			if (*status & UART_LSR_SPECIAL) {
+				if (*status & UART_LSR_BI) {
+					flag = TTY_BREAK;
+					port->icount.brk++;
+
+					if (port->port.flags & ASYNC_SAK)
+						do_SAK(tty);
+				} else if (*status & UART_LSR_PE) {
+					flag = TTY_PARITY;
+					port->icount.parity++;
+				} else if (*status & UART_LSR_FE) {
+					flag = TTY_FRAME;
+					port->icount.frame++;
+				} else if (*status & UART_LSR_OE) {
+					flag = TTY_OVERRUN;
+					port->icount.overrun++;
+				} else
+					flag = TTY_BREAK;
+			}
+			tty_insert_flip_char(&port->port, ch, flag);
+			cnt++;
+			if (cnt >= recv_room) {
+				if (!port->ldisc_stop_rx)
+					mxser_stoprx(tty);
+				break;
+			}
+
+		}
+
+		if (port->board->chip_flag)
+			break;
+
+		*status = inb(port->ioaddr + UART_LSR);
+	} while (*status & UART_LSR_DR);
+
+end_intr:
+	mxvar_log.rxcnt[tty->index] += cnt;
+	port->mon_data.rxcnt += cnt;
+	port->mon_data.up_rxcnt += cnt;
+
+	/*
+	 * We are called from an interrupt context with &port->slock
+	 * being held. Drop it temporarily in order to prevent
+	 * recursive locking.
+	 */
+	spin_unlock(&port->slock);
+	tty_flip_buffer_push(&port->port);
+	spin_lock(&port->slock);
+}
+
+static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
+{
+	int count, cnt;
+
+	if (port->x_char) {
+		outb(port->x_char, port->ioaddr + UART_TX);
+		port->x_char = 0;
+		mxvar_log.txcnt[tty->index]++;
+		port->mon_data.txcnt++;
+		port->mon_data.up_txcnt++;
+		port->icount.tx++;
+		return;
+	}
+
+	if (port->port.xmit_buf == NULL)
+		return;
+
+	if (port->xmit_cnt <= 0 || tty->stopped ||
+			(tty->hw_stopped &&
+			(port->type != PORT_16550A) &&
+			(!port->board->chip_flag))) {
+		port->IER &= ~UART_IER_THRI;
+		outb(port->IER, port->ioaddr + UART_IER);
+		return;
+	}
+
+	cnt = port->xmit_cnt;
+	count = port->xmit_fifo_size;
+	do {
+		outb(port->port.xmit_buf[port->xmit_tail++],
+			port->ioaddr + UART_TX);
+		port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
+		if (--port->xmit_cnt <= 0)
+			break;
+	} while (--count > 0);
+	mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
+
+	port->mon_data.txcnt += (cnt - port->xmit_cnt);
+	port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
+	port->icount.tx += (cnt - port->xmit_cnt);
+
+	if (port->xmit_cnt < WAKEUP_CHARS)
+		tty_wakeup(tty);
+
+	if (port->xmit_cnt <= 0) {
+		port->IER &= ~UART_IER_THRI;
+		outb(port->IER, port->ioaddr + UART_IER);
+	}
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+static irqreturn_t mxser_interrupt(int irq, void *dev_id)
+{
+	int status, iir, i;
+	struct mxser_board *brd = NULL;
+	struct mxser_port *port;
+	int max, irqbits, bits, msr;
+	unsigned int int_cnt, pass_counter = 0;
+	int handled = IRQ_NONE;
+	struct tty_struct *tty;
+
+	for (i = 0; i < MXSER_BOARDS; i++)
+		if (dev_id == &mxser_boards[i]) {
+			brd = dev_id;
+			break;
+		}
+
+	if (i == MXSER_BOARDS)
+		goto irq_stop;
+	if (brd == NULL)
+		goto irq_stop;
+	max = brd->info->nports;
+	while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
+		irqbits = inb(brd->vector) & brd->vector_mask;
+		if (irqbits == brd->vector_mask)
+			break;
+
+		handled = IRQ_HANDLED;
+		for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
+			if (irqbits == brd->vector_mask)
+				break;
+			if (bits & irqbits)
+				continue;
+			port = &brd->ports[i];
+
+			int_cnt = 0;
+			spin_lock(&port->slock);
+			do {
+				iir = inb(port->ioaddr + UART_IIR);
+				if (iir & UART_IIR_NO_INT)
+					break;
+				iir &= MOXA_MUST_IIR_MASK;
+				tty = tty_port_tty_get(&port->port);
+				if (!tty || port->closing ||
+				    !tty_port_initialized(&port->port)) {
+					status = inb(port->ioaddr + UART_LSR);
+					outb(0x27, port->ioaddr + UART_FCR);
+					inb(port->ioaddr + UART_MSR);
+					tty_kref_put(tty);
+					break;
+				}
+
+				status = inb(port->ioaddr + UART_LSR);
+
+				if (status & UART_LSR_PE)
+					port->err_shadow |= NPPI_NOTIFY_PARITY;
+				if (status & UART_LSR_FE)
+					port->err_shadow |= NPPI_NOTIFY_FRAMING;
+				if (status & UART_LSR_OE)
+					port->err_shadow |=
+						NPPI_NOTIFY_HW_OVERRUN;
+				if (status & UART_LSR_BI)
+					port->err_shadow |= NPPI_NOTIFY_BREAK;
+
+				if (port->board->chip_flag) {
+					if (iir == MOXA_MUST_IIR_GDA ||
+					    iir == MOXA_MUST_IIR_RDA ||
+					    iir == MOXA_MUST_IIR_RTO ||
+					    iir == MOXA_MUST_IIR_LSR)
+						mxser_receive_chars(tty, port,
+								&status);
+
+				} else {
+					status &= port->read_status_mask;
+					if (status & UART_LSR_DR)
+						mxser_receive_chars(tty, port,
+								&status);
+				}
+				msr = inb(port->ioaddr + UART_MSR);
+				if (msr & UART_MSR_ANY_DELTA)
+					mxser_check_modem_status(tty, port, msr);
+
+				if (port->board->chip_flag) {
+					if (iir == 0x02 && (status &
+								UART_LSR_THRE))
+						mxser_transmit_chars(tty, port);
+				} else {
+					if (status & UART_LSR_THRE)
+						mxser_transmit_chars(tty, port);
+				}
+				tty_kref_put(tty);
+			} while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
+			spin_unlock(&port->slock);
+		}
+	}
+
+irq_stop:
+	return handled;
+}
+
+static const struct tty_operations mxser_ops = {
+	.open = mxser_open,
+	.close = mxser_close,
+	.write = mxser_write,
+	.put_char = mxser_put_char,
+	.flush_chars = mxser_flush_chars,
+	.write_room = mxser_write_room,
+	.chars_in_buffer = mxser_chars_in_buffer,
+	.flush_buffer = mxser_flush_buffer,
+	.ioctl = mxser_ioctl,
+	.throttle = mxser_throttle,
+	.unthrottle = mxser_unthrottle,
+	.set_termios = mxser_set_termios,
+	.stop = mxser_stop,
+	.start = mxser_start,
+	.hangup = mxser_hangup,
+	.break_ctl = mxser_rs_break,
+	.wait_until_sent = mxser_wait_until_sent,
+	.tiocmget = mxser_tiocmget,
+	.tiocmset = mxser_tiocmset,
+	.set_serial = mxser_set_serial_info,
+	.get_serial = mxser_get_serial_info,
+	.get_icount = mxser_get_icount,
+};
+
+static const struct tty_port_operations mxser_port_ops = {
+	.carrier_raised = mxser_carrier_raised,
+	.dtr_rts = mxser_dtr_rts,
+	.activate = mxser_activate,
+	.shutdown = mxser_shutdown_port,
+};
+
+/*
+ * The MOXA Smartio/Industio serial driver boot-time initialization code!
+ */
+
+static bool allow_overlapping_vector;
+module_param(allow_overlapping_vector, bool, S_IRUGO);
+MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
+
+static bool mxser_overlapping_vector(struct mxser_board *brd)
+{
+	return allow_overlapping_vector &&
+		brd->vector >= brd->ports[0].ioaddr &&
+		brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
+}
+
+static int mxser_request_vector(struct mxser_board *brd)
+{
+	if (mxser_overlapping_vector(brd))
+		return 0;
+	return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
+}
+
+static void mxser_release_vector(struct mxser_board *brd)
+{
+	if (mxser_overlapping_vector(brd))
+		return;
+	release_region(brd->vector, 1);
+}
+
+static void mxser_release_ISA_res(struct mxser_board *brd)
+{
+	release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
+	mxser_release_vector(brd);
+}
+
+static int mxser_initbrd(struct mxser_board *brd)
+{
+	struct mxser_port *info;
+	unsigned int i;
+	int retval;
+
+	printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
+			brd->ports[0].max_baud);
+
+	for (i = 0; i < brd->info->nports; i++) {
+		info = &brd->ports[i];
+		tty_port_init(&info->port);
+		info->port.ops = &mxser_port_ops;
+		info->board = brd;
+		info->stop_rx = 0;
+		info->ldisc_stop_rx = 0;
+
+		/* Enhance mode enabled here */
+		if (brd->chip_flag != MOXA_OTHER_UART)
+			mxser_enable_must_enchance_mode(info->ioaddr);
+
+		info->type = brd->uart_type;
+
+		process_txrx_fifo(info);
+
+		info->custom_divisor = info->baud_base * 16;
+		info->port.close_delay = 5 * HZ / 10;
+		info->port.closing_wait = 30 * HZ;
+		info->normal_termios = mxvar_sdriver->init_termios;
+		memset(&info->mon_data, 0, sizeof(struct mxser_mon));
+		info->err_shadow = 0;
+		spin_lock_init(&info->slock);
+
+		/* before set INT ISR, disable all int */
+		outb(inb(info->ioaddr + UART_IER) & 0xf0,
+			info->ioaddr + UART_IER);
+	}
+
+	retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
+			brd);
+	if (retval) {
+		for (i = 0; i < brd->info->nports; i++)
+			tty_port_destroy(&brd->ports[i].port);
+		printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
+			"conflict with another device.\n",
+			brd->info->name, brd->irq);
+	}
+
+	return retval;
+}
+
+static void mxser_board_remove(struct mxser_board *brd)
+{
+	unsigned int i;
+
+	for (i = 0; i < brd->info->nports; i++) {
+		tty_unregister_device(mxvar_sdriver, brd->idx + i);
+		tty_port_destroy(&brd->ports[i].port);
+	}
+	free_irq(brd->irq, brd);
+}
+
+static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
+{
+	int id, i, bits, ret;
+	unsigned short regs[16], irq;
+	unsigned char scratch, scratch2;
+
+	brd->chip_flag = MOXA_OTHER_UART;
+
+	id = mxser_read_register(cap, regs);
+	switch (id) {
+	case C168_ASIC_ID:
+		brd->info = &mxser_cards[0];
+		break;
+	case C104_ASIC_ID:
+		brd->info = &mxser_cards[1];
+		break;
+	case CI104J_ASIC_ID:
+		brd->info = &mxser_cards[2];
+		break;
+	case C102_ASIC_ID:
+		brd->info = &mxser_cards[5];
+		break;
+	case CI132_ASIC_ID:
+		brd->info = &mxser_cards[6];
+		break;
+	case CI134_ASIC_ID:
+		brd->info = &mxser_cards[7];
+		break;
+	default:
+		return 0;
+	}
+
+	irq = 0;
+	/* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
+	   Flag-hack checks if configuration should be read as 2-port here. */
+	if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
+		irq = regs[9] & 0xF000;
+		irq = irq | (irq >> 4);
+		if (irq != (regs[9] & 0xFF00))
+			goto err_irqconflict;
+	} else if (brd->info->nports == 4) {
+		irq = regs[9] & 0xF000;
+		irq = irq | (irq >> 4);
+		irq = irq | (irq >> 8);
+		if (irq != regs[9])
+			goto err_irqconflict;
+	} else if (brd->info->nports == 8) {
+		irq = regs[9] & 0xF000;
+		irq = irq | (irq >> 4);
+		irq = irq | (irq >> 8);
+		if ((irq != regs[9]) || (irq != regs[10]))
+			goto err_irqconflict;
+	}
+
+	if (!irq) {
+		printk(KERN_ERR "mxser: interrupt number unset\n");
+		return -EIO;
+	}
+	brd->irq = ((int)(irq & 0xF000) >> 12);
+	for (i = 0; i < 8; i++)
+		brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
+	if ((regs[12] & 0x80) == 0) {
+		printk(KERN_ERR "mxser: invalid interrupt vector\n");
+		return -EIO;
+	}
+	brd->vector = (int)regs[11];	/* interrupt vector */
+	if (id == 1)
+		brd->vector_mask = 0x00FF;
+	else
+		brd->vector_mask = 0x000F;
+	for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
+		if (regs[12] & bits) {
+			brd->ports[i].baud_base = 921600;
+			brd->ports[i].max_baud = 921600;
+		} else {
+			brd->ports[i].baud_base = 115200;
+			brd->ports[i].max_baud = 115200;
+		}
+	}
+	scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
+	outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
+	outb(0, cap + UART_EFR);	/* EFR is the same as FCR */
+	outb(scratch2, cap + UART_LCR);
+	outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
+	scratch = inb(cap + UART_IIR);
+
+	if (scratch & 0xC0)
+		brd->uart_type = PORT_16550A;
+	else
+		brd->uart_type = PORT_16450;
+	if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
+			"mxser(IO)")) {
+		printk(KERN_ERR "mxser: can't request ports I/O region: "
+				"0x%.8lx-0x%.8lx\n",
+				brd->ports[0].ioaddr, brd->ports[0].ioaddr +
+				8 * brd->info->nports - 1);
+		return -EIO;
+	}
+
+	ret = mxser_request_vector(brd);
+	if (ret) {
+		release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
+		printk(KERN_ERR "mxser: can't request interrupt vector region: "
+				"0x%.8lx-0x%.8lx\n",
+				brd->ports[0].ioaddr, brd->ports[0].ioaddr +
+				8 * brd->info->nports - 1);
+		return ret;
+	}
+	return brd->info->nports;
+
+err_irqconflict:
+	printk(KERN_ERR "mxser: invalid interrupt number\n");
+	return -EIO;
+}
+
+static int mxser_probe(struct pci_dev *pdev,
+		const struct pci_device_id *ent)
+{
+#ifdef CONFIG_PCI
+	struct mxser_board *brd;
+	unsigned int i, j;
+	unsigned long ioaddress;
+	struct device *tty_dev;
+	int retval = -EINVAL;
+
+	for (i = 0; i < MXSER_BOARDS; i++)
+		if (mxser_boards[i].info == NULL)
+			break;
+
+	if (i >= MXSER_BOARDS) {
+		dev_err(&pdev->dev, "too many boards found (maximum %d), board "
+				"not configured\n", MXSER_BOARDS);
+		goto err;
+	}
+
+	brd = &mxser_boards[i];
+	brd->idx = i * MXSER_PORTS_PER_BOARD;
+	dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
+		mxser_cards[ent->driver_data].name,
+		pdev->bus->number, PCI_SLOT(pdev->devfn));
+
+	retval = pci_enable_device(pdev);
+	if (retval) {
+		dev_err(&pdev->dev, "PCI enable failed\n");
+		goto err;
+	}
+
+	/* io address */
+	ioaddress = pci_resource_start(pdev, 2);
+	retval = pci_request_region(pdev, 2, "mxser(IO)");
+	if (retval)
+		goto err_dis;
+
+	brd->info = &mxser_cards[ent->driver_data];
+	for (i = 0; i < brd->info->nports; i++)
+		brd->ports[i].ioaddr = ioaddress + 8 * i;
+
+	/* vector */
+	ioaddress = pci_resource_start(pdev, 3);
+	retval = pci_request_region(pdev, 3, "mxser(vector)");
+	if (retval)
+		goto err_zero;
+	brd->vector = ioaddress;
+
+	/* irq */
+	brd->irq = pdev->irq;
+
+	brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
+	brd->uart_type = PORT_16550A;
+	brd->vector_mask = 0;
+
+	for (i = 0; i < brd->info->nports; i++) {
+		for (j = 0; j < UART_INFO_NUM; j++) {
+			if (Gpci_uart_info[j].type == brd->chip_flag) {
+				brd->ports[i].max_baud =
+					Gpci_uart_info[j].max_baud;
+
+				/* exception....CP-102 */
+				if (brd->info->flags & MXSER_HIGHBAUD)
+					brd->ports[i].max_baud = 921600;
+				break;
+			}
+		}
+	}
+
+	if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
+		for (i = 0; i < brd->info->nports; i++) {
+			if (i < 4)
+				brd->ports[i].opmode_ioaddr = ioaddress + 4;
+			else
+				brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
+		}
+		outb(0, ioaddress + 4);	/* default set to RS232 mode */
+		outb(0, ioaddress + 0x0c);	/* default set to RS232 mode */
+	}
+
+	for (i = 0; i < brd->info->nports; i++) {
+		brd->vector_mask |= (1 << i);
+		brd->ports[i].baud_base = 921600;
+	}
+
+	/* mxser_initbrd will hook ISR. */
+	retval = mxser_initbrd(brd);
+	if (retval)
+		goto err_rel3;
+
+	for (i = 0; i < brd->info->nports; i++) {
+		tty_dev = tty_port_register_device(&brd->ports[i].port,
+				mxvar_sdriver, brd->idx + i, &pdev->dev);
+		if (IS_ERR(tty_dev)) {
+			retval = PTR_ERR(tty_dev);
+			for (; i > 0; i--)
+				tty_unregister_device(mxvar_sdriver,
+					brd->idx + i - 1);
+			goto err_relbrd;
+		}
+	}
+
+	pci_set_drvdata(pdev, brd);
+
+	return 0;
+err_relbrd:
+	for (i = 0; i < brd->info->nports; i++)
+		tty_port_destroy(&brd->ports[i].port);
+	free_irq(brd->irq, brd);
+err_rel3:
+	pci_release_region(pdev, 3);
+err_zero:
+	brd->info = NULL;
+	pci_release_region(pdev, 2);
+err_dis:
+	pci_disable_device(pdev);
+err:
+	return retval;
+#else
+	return -ENODEV;
+#endif
+}
+
+static void mxser_remove(struct pci_dev *pdev)
+{
+#ifdef CONFIG_PCI
+	struct mxser_board *brd = pci_get_drvdata(pdev);
+
+	mxser_board_remove(brd);
+
+	pci_release_region(pdev, 2);
+	pci_release_region(pdev, 3);
+	pci_disable_device(pdev);
+	brd->info = NULL;
+#endif
+}
+
+static struct pci_driver mxser_driver = {
+	.name = "mxser",
+	.id_table = mxser_pcibrds,
+	.probe = mxser_probe,
+	.remove = mxser_remove
+};
+
+static int __init mxser_module_init(void)
+{
+	struct mxser_board *brd;
+	struct device *tty_dev;
+	unsigned int b, i, m;
+	int retval;
+
+	mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
+	if (!mxvar_sdriver)
+		return -ENOMEM;
+
+	printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
+		MXSER_VERSION);
+
+	/* Initialize the tty_driver structure */
+	mxvar_sdriver->name = "ttyMI";
+	mxvar_sdriver->major = ttymajor;
+	mxvar_sdriver->minor_start = 0;
+	mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
+	mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
+	mxvar_sdriver->init_termios = tty_std_termios;
+	mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
+	mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
+	tty_set_operations(mxvar_sdriver, &mxser_ops);
+
+	retval = tty_register_driver(mxvar_sdriver);
+	if (retval) {
+		printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
+				"tty driver !\n");
+		goto err_put;
+	}
+
+	/* Start finding ISA boards here */
+	for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
+		if (!ioaddr[b])
+			continue;
+
+		brd = &mxser_boards[m];
+		retval = mxser_get_ISA_conf(ioaddr[b], brd);
+		if (retval <= 0) {
+			brd->info = NULL;
+			continue;
+		}
+
+		printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
+				brd->info->name, ioaddr[b]);
+
+		/* mxser_initbrd will hook ISR. */
+		if (mxser_initbrd(brd) < 0) {
+			mxser_release_ISA_res(brd);
+			brd->info = NULL;
+			continue;
+		}
+
+		brd->idx = m * MXSER_PORTS_PER_BOARD;
+		for (i = 0; i < brd->info->nports; i++) {
+			tty_dev = tty_port_register_device(&brd->ports[i].port,
+					mxvar_sdriver, brd->idx + i, NULL);
+			if (IS_ERR(tty_dev)) {
+				for (; i > 0; i--)
+					tty_unregister_device(mxvar_sdriver,
+						brd->idx + i - 1);
+				for (i = 0; i < brd->info->nports; i++)
+					tty_port_destroy(&brd->ports[i].port);
+				free_irq(brd->irq, brd);
+				mxser_release_ISA_res(brd);
+				brd->info = NULL;
+				break;
+			}
+		}
+		if (brd->info == NULL)
+			continue;
+
+		m++;
+	}
+
+	retval = pci_register_driver(&mxser_driver);
+	if (retval) {
+		printk(KERN_ERR "mxser: can't register pci driver\n");
+		if (!m) {
+			retval = -ENODEV;
+			goto err_unr;
+		} /* else: we have some ISA cards under control */
+	}
+
+	return 0;
+err_unr:
+	tty_unregister_driver(mxvar_sdriver);
+err_put:
+	put_tty_driver(mxvar_sdriver);
+	return retval;
+}
+
+static void __exit mxser_module_exit(void)
+{
+	unsigned int i;
+
+	pci_unregister_driver(&mxser_driver);
+
+	for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
+		if (mxser_boards[i].info != NULL)
+			mxser_board_remove(&mxser_boards[i]);
+	tty_unregister_driver(mxvar_sdriver);
+	put_tty_driver(mxvar_sdriver);
+
+	for (i = 0; i < MXSER_BOARDS; i++)
+		if (mxser_boards[i].info != NULL)
+			mxser_release_ISA_res(&mxser_boards[i]);
+}
+
+module_init(mxser_module_init);
+module_exit(mxser_module_exit);