Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 1699 insertions, 0 deletions

diff --git a/drivers/tty/isicom.c b/drivers/tty/isicom.c
new file mode 100644
index 000000000..3b2f9fb01
--- /dev/null
+++ b/drivers/tty/isicom.c
@@ -0,0 +1,1699 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *	Original driver code supplied by Multi-Tech
+ *
+ *	Changes
+ *	1/9/98	alan@lxorguk.ukuu.org.uk
+ *					Merge to 2.0.x kernel tree
+ *					Obtain and use official major/minors
+ *					Loader switched to a misc device
+ *					(fixed range check bug as a side effect)
+ *					Printk clean up
+ *	9/12/98	alan@lxorguk.ukuu.org.uk
+ *					Rough port to 2.1.x
+ *
+ *	10/6/99 sameer			Merged the ISA and PCI drivers to
+ *					a new unified driver.
+ *
+ *	3/9/99	sameer			Added support for ISI4616 cards.
+ *
+ *	16/9/99	sameer			We do not force RTS low anymore.
+ *					This is to prevent the firmware
+ *					from getting confused.
+ *
+ *	26/10/99 sameer			Cosmetic changes:The driver now
+ *					dumps the Port Count information
+ *					along with I/O address and IRQ.
+ *
+ *	13/12/99 sameer			Fixed the problem with IRQ sharing.
+ *
+ *	10/5/00  sameer			Fixed isicom_shutdown_board()
+ *					to not lower DTR on all the ports
+ *					when the last port on the card is
+ *					closed.
+ *
+ *	10/5/00  sameer			Signal mask setup command added
+ *					to  isicom_setup_port and
+ *					isicom_shutdown_port.
+ *
+ *	24/5/00  sameer			The driver is now SMP aware.
+ *
+ *
+ *	27/11/00 Vinayak P Risbud	Fixed the Driver Crash Problem
+ *
+ *
+ *	03/01/01  anil .s		Added support for resetting the
+ *					internal modems on ISI cards.
+ *
+ *	08/02/01  anil .s		Upgraded the driver for kernel
+ *					2.4.x
+ *
+ *	11/04/01  Kevin			Fixed firmware load problem with
+ *					ISIHP-4X card
+ *
+ *	30/04/01  anil .s		Fixed the remote login through
+ *					ISI port problem. Now the link
+ *					does not go down before password
+ *					prompt.
+ *
+ *	03/05/01  anil .s		Fixed the problem with IRQ sharing
+ *					among ISI-PCI cards.
+ *
+ *	03/05/01  anil .s		Added support to display the version
+ *					info during insmod as well as module
+ *					listing by lsmod.
+ *
+ *	10/05/01  anil .s		Done the modifications to the source
+ *					file and Install script so that the
+ *					same installation can be used for
+ *					2.2.x and 2.4.x kernel.
+ *
+ *	06/06/01  anil .s		Now we drop both dtr and rts during
+ *					shutdown_port as well as raise them
+ *					during isicom_config_port.
+ *
+ *	09/06/01 acme@conectiva.com.br	use capable, not suser, do
+ *					restore_flags on failure in
+ *					isicom_send_break, verify put_user
+ *					result
+ *
+ *	11/02/03  ranjeeth		Added support for 230 Kbps and 460 Kbps
+ *					Baud index extended to 21
+ *
+ *	20/03/03  ranjeeth		Made to work for Linux Advanced server.
+ *					Taken care of license warning.
+ *
+ *	10/12/03  Ravindra		Made to work for Fedora Core 1 of
+ *					Red Hat Distribution
+ *
+ *	06/01/05  Alan Cox 		Merged the ISI and base kernel strands
+ *					into a single 2.6 driver
+ *
+ *	***********************************************************
+ *
+ *	To use this driver you also need the support package. You
+ *	can find this in RPM format on
+ *		ftp://ftp.linux.org.uk/pub/linux/alan
+ *
+ *	You can find the original tools for this direct from Multitech
+ *		ftp://ftp.multitech.com/ISI-Cards/
+ *
+ *	Having installed the cards the module options (/etc/modprobe.d/)
+ *
+ *	options isicom   io=card1,card2,card3,card4 irq=card1,card2,card3,card4
+ *
+ *	Omit those entries for boards you don't have installed.
+ *
+ *	TODO
+ *		Merge testing
+ *		64-bit verification
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/termios.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/serial.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+#include <linux/pci.h>
+
+#include <linux/isicom.h>
+
+#define InterruptTheCard(base) outw(0, (base) + 0xc)
+#define ClearInterrupt(base) inw((base) + 0x0a)
+
+#ifdef DEBUG
+#define isicom_paranoia_check(a, b, c) __isicom_paranoia_check((a), (b), (c))
+#else
+#define isicom_paranoia_check(a, b, c) 0
+#endif
+
+static int isicom_probe(struct pci_dev *, const struct pci_device_id *);
+static void isicom_remove(struct pci_dev *);
+
+static const struct pci_device_id isicom_pci_tbl[] = {
+	{ PCI_DEVICE(VENDOR_ID, 0x2028) },
+	{ PCI_DEVICE(VENDOR_ID, 0x2051) },
+	{ PCI_DEVICE(VENDOR_ID, 0x2052) },
+	{ PCI_DEVICE(VENDOR_ID, 0x2053) },
+	{ PCI_DEVICE(VENDOR_ID, 0x2054) },
+	{ PCI_DEVICE(VENDOR_ID, 0x2055) },
+	{ PCI_DEVICE(VENDOR_ID, 0x2056) },
+	{ PCI_DEVICE(VENDOR_ID, 0x2057) },
+	{ PCI_DEVICE(VENDOR_ID, 0x2058) },
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(pci, isicom_pci_tbl);
+
+static struct pci_driver isicom_driver = {
+	.name		= "isicom",
+	.id_table	= isicom_pci_tbl,
+	.probe		= isicom_probe,
+	.remove		= isicom_remove
+};
+
+static int prev_card = 3;	/*	start servicing isi_card[0]	*/
+static struct tty_driver *isicom_normal;
+
+static void isicom_tx(struct timer_list *unused);
+static void isicom_start(struct tty_struct *tty);
+
+static DEFINE_TIMER(tx, isicom_tx);
+
+/*   baud index mappings from linux defns to isi */
+
+static signed char linuxb_to_isib[] = {
+	-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17, 18, 19, 20, 21
+};
+
+struct	isi_board {
+	unsigned long		base;
+	int			irq;
+	unsigned char		port_count;
+	unsigned short		status;
+	unsigned short		port_status; /* each bit for each port */
+	unsigned short		shift_count;
+	struct isi_port		*ports;
+	signed char		count;
+	spinlock_t		card_lock; /* Card wide lock 11/5/00 -sameer */
+	unsigned long		flags;
+	unsigned int		index;
+};
+
+struct	isi_port {
+	unsigned short		magic;
+	struct tty_port		port;
+	u16			channel;
+	u16			status;
+	struct isi_board	*card;
+	unsigned char		*xmit_buf;
+	int			xmit_head;
+	int			xmit_tail;
+	int			xmit_cnt;
+};
+
+static struct isi_board isi_card[BOARD_COUNT];
+static struct isi_port  isi_ports[PORT_COUNT];
+
+/*
+ *	Locking functions for card level locking. We need to own both
+ *	the kernel lock for the card and have the card in a position that
+ *	it wants to talk.
+ */
+
+static int WaitTillCardIsFree(unsigned long base)
+{
+	unsigned int count = 0;
+
+	while (!(inw(base + 0xe) & 0x1) && count++ < 100)
+		mdelay(1);
+
+	return !(inw(base + 0xe) & 0x1);
+}
+
+static int lock_card(struct isi_board *card)
+{
+	unsigned long base = card->base;
+	unsigned int retries, a;
+
+	for (retries = 0; retries < 10; retries++) {
+		spin_lock_irqsave(&card->card_lock, card->flags);
+		for (a = 0; a < 10; a++) {
+			if (inw(base + 0xe) & 0x1)
+				return 1;
+			udelay(10);
+		}
+		spin_unlock_irqrestore(&card->card_lock, card->flags);
+		msleep(10);
+	}
+	pr_warn("Failed to lock Card (0x%lx)\n", card->base);
+
+	return 0;	/* Failed to acquire the card! */
+}
+
+static void unlock_card(struct isi_board *card)
+{
+	spin_unlock_irqrestore(&card->card_lock, card->flags);
+}
+
+/*
+ *  ISI Card specific ops ...
+ */
+
+/* card->lock HAS to be held */
+static void raise_dtr(struct isi_port *port)
+{
+	struct isi_board *card = port->card;
+	unsigned long base = card->base;
+	u16 channel = port->channel;
+
+	if (WaitTillCardIsFree(base))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+	outw(0x0504, base);
+	InterruptTheCard(base);
+	port->status |= ISI_DTR;
+}
+
+/* card->lock HAS to be held */
+static void drop_dtr(struct isi_port *port)
+{
+	struct isi_board *card = port->card;
+	unsigned long base = card->base;
+	u16 channel = port->channel;
+
+	if (WaitTillCardIsFree(base))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+	outw(0x0404, base);
+	InterruptTheCard(base);
+	port->status &= ~ISI_DTR;
+}
+
+/* card->lock HAS to be held */
+static inline void raise_rts(struct isi_port *port)
+{
+	struct isi_board *card = port->card;
+	unsigned long base = card->base;
+	u16 channel = port->channel;
+
+	if (WaitTillCardIsFree(base))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+	outw(0x0a04, base);
+	InterruptTheCard(base);
+	port->status |= ISI_RTS;
+}
+
+/* card->lock HAS to be held */
+static inline void drop_rts(struct isi_port *port)
+{
+	struct isi_board *card = port->card;
+	unsigned long base = card->base;
+	u16 channel = port->channel;
+
+	if (WaitTillCardIsFree(base))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+	outw(0x0804, base);
+	InterruptTheCard(base);
+	port->status &= ~ISI_RTS;
+}
+
+/* card->lock MUST NOT be held */
+
+static void isicom_dtr_rts(struct tty_port *port, int on)
+{
+	struct isi_port *ip = container_of(port, struct isi_port, port);
+	struct isi_board *card = ip->card;
+	unsigned long base = card->base;
+	u16 channel = ip->channel;
+
+	if (!lock_card(card))
+		return;
+
+	if (on) {
+		outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+		outw(0x0f04, base);
+		InterruptTheCard(base);
+		ip->status |= (ISI_DTR | ISI_RTS);
+	} else {
+		outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+		outw(0x0C04, base);
+		InterruptTheCard(base);
+		ip->status &= ~(ISI_DTR | ISI_RTS);
+	}
+	unlock_card(card);
+}
+
+/* card->lock HAS to be held */
+static void drop_dtr_rts(struct isi_port *port)
+{
+	struct isi_board *card = port->card;
+	unsigned long base = card->base;
+	u16 channel = port->channel;
+
+	if (WaitTillCardIsFree(base))
+		return;
+
+	outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+	outw(0x0c04, base);
+	InterruptTheCard(base);
+	port->status &= ~(ISI_RTS | ISI_DTR);
+}
+
+/*
+ *	ISICOM Driver specific routines ...
+ *
+ */
+
+static inline int __isicom_paranoia_check(struct isi_port const *port,
+	char *name, const char *routine)
+{
+	if (!port) {
+		pr_warn("Warning: bad isicom magic for dev %s in %s\n",
+			name, routine);
+		return 1;
+	}
+	if (port->magic != ISICOM_MAGIC) {
+		pr_warn("Warning: NULL isicom port for dev %s in %s\n",
+			name, routine);
+		return 1;
+	}
+
+	return 0;
+}
+
+/*
+ *	Transmitter.
+ *
+ *	We shovel data into the card buffers on a regular basis. The card
+ *	will do the rest of the work for us.
+ */
+
+static void isicom_tx(struct timer_list *unused)
+{
+	unsigned long flags, base;
+	unsigned int retries;
+	short count = (BOARD_COUNT-1), card;
+	short txcount, wrd, residue, word_count, cnt;
+	struct isi_port *port;
+	struct tty_struct *tty;
+
+	/*	find next active board	*/
+	card = (prev_card + 1) & 0x0003;
+	while (count-- > 0) {
+		if (isi_card[card].status & BOARD_ACTIVE)
+			break;
+		card = (card + 1) & 0x0003;
+	}
+	if (!(isi_card[card].status & BOARD_ACTIVE))
+		goto sched_again;
+
+	prev_card = card;
+
+	count = isi_card[card].port_count;
+	port = isi_card[card].ports;
+	base = isi_card[card].base;
+
+	spin_lock_irqsave(&isi_card[card].card_lock, flags);
+	for (retries = 0; retries < 100; retries++) {
+		if (inw(base + 0xe) & 0x1)
+			break;
+		udelay(2);
+	}
+	if (retries >= 100)
+		goto unlock;
+
+	tty = tty_port_tty_get(&port->port);
+	if (tty == NULL)
+		goto put_unlock;
+
+	for (; count > 0; count--, port++) {
+		/* port not active or tx disabled to force flow control */
+		if (!tty_port_initialized(&port->port) ||
+			!(port->status & ISI_TXOK))
+			continue;
+
+		txcount = min_t(short, TX_SIZE, port->xmit_cnt);
+		if (txcount <= 0 || tty->stopped || tty->hw_stopped)
+			continue;
+
+		if (!(inw(base + 0x02) & (1 << port->channel)))
+			continue;
+
+		pr_debug("txing %d bytes, port%d.\n",
+			 txcount, port->channel + 1);
+		outw((port->channel << isi_card[card].shift_count) | txcount,
+			base);
+		residue = NO;
+		wrd = 0;
+		while (1) {
+			cnt = min_t(int, txcount, (SERIAL_XMIT_SIZE
+					- port->xmit_tail));
+			if (residue == YES) {
+				residue = NO;
+				if (cnt > 0) {
+					wrd |= (port->port.xmit_buf[port->xmit_tail]
+									<< 8);
+					port->xmit_tail = (port->xmit_tail + 1)
+						& (SERIAL_XMIT_SIZE - 1);
+					port->xmit_cnt--;
+					txcount--;
+					cnt--;
+					outw(wrd, base);
+				} else {
+					outw(wrd, base);
+					break;
+				}
+			}
+			if (cnt <= 0)
+				break;
+			word_count = cnt >> 1;
+			outsw(base, port->port.xmit_buf+port->xmit_tail, word_count);
+			port->xmit_tail = (port->xmit_tail
+				+ (word_count << 1)) & (SERIAL_XMIT_SIZE - 1);
+			txcount -= (word_count << 1);
+			port->xmit_cnt -= (word_count << 1);
+			if (cnt & 0x0001) {
+				residue = YES;
+				wrd = port->port.xmit_buf[port->xmit_tail];
+				port->xmit_tail = (port->xmit_tail + 1)
+					& (SERIAL_XMIT_SIZE - 1);
+				port->xmit_cnt--;
+				txcount--;
+			}
+		}
+
+		InterruptTheCard(base);
+		if (port->xmit_cnt <= 0)
+			port->status &= ~ISI_TXOK;
+		if (port->xmit_cnt <= WAKEUP_CHARS)
+			tty_wakeup(tty);
+	}
+
+put_unlock:
+	tty_kref_put(tty);
+unlock:
+	spin_unlock_irqrestore(&isi_card[card].card_lock, flags);
+	/*	schedule another tx for hopefully in about 10ms	*/
+sched_again:
+	mod_timer(&tx, jiffies + msecs_to_jiffies(10));
+}
+
+/*
+ *	Main interrupt handler routine
+ */
+
+static irqreturn_t isicom_interrupt(int irq, void *dev_id)
+{
+	struct isi_board *card = dev_id;
+	struct isi_port *port;
+	struct tty_struct *tty;
+	unsigned long base;
+	u16 header, word_count, count, channel;
+	short byte_count;
+	unsigned char *rp;
+
+	if (!card || !(card->status & FIRMWARE_LOADED))
+		return IRQ_NONE;
+
+	base = card->base;
+
+	/* did the card interrupt us? */
+	if (!(inw(base + 0x0e) & 0x02))
+		return IRQ_NONE;
+
+	spin_lock(&card->card_lock);
+
+	/*
+	 * disable any interrupts from the PCI card and lower the
+	 * interrupt line
+	 */
+	outw(0x8000, base+0x04);
+	ClearInterrupt(base);
+
+	inw(base);		/* get the dummy word out */
+	header = inw(base);
+	channel = (header & 0x7800) >> card->shift_count;
+	byte_count = header & 0xff;
+
+	if (channel + 1 > card->port_count) {
+		pr_warn("%s(0x%lx): %d(channel) > port_count\n",
+			__func__, base, channel + 1);
+		outw(0x0000, base+0x04); /* enable interrupts */
+		spin_unlock(&card->card_lock);
+		return IRQ_HANDLED;
+	}
+	port = card->ports + channel;
+	if (!tty_port_initialized(&port->port)) {
+		outw(0x0000, base+0x04); /* enable interrupts */
+		spin_unlock(&card->card_lock);
+		return IRQ_HANDLED;
+	}
+
+	tty = tty_port_tty_get(&port->port);
+	if (tty == NULL) {
+		while (byte_count > 1) {
+			inw(base);
+			byte_count -= 2;
+		}
+		if (byte_count & 0x01)
+			inw(base);
+		outw(0x0000, base+0x04); /* enable interrupts */
+		spin_unlock(&card->card_lock);
+		return IRQ_HANDLED;
+	}
+
+	if (header & 0x8000) {		/* Status Packet */
+		header = inw(base);
+		switch (header & 0xff) {
+		case 0:	/* Change in EIA signals */
+			if (tty_port_check_carrier(&port->port)) {
+				if (port->status & ISI_DCD) {
+					if (!(header & ISI_DCD)) {
+					/* Carrier has been lost  */
+						pr_debug("%s: DCD->low.\n",
+							 __func__);
+						port->status &= ~ISI_DCD;
+						tty_hangup(tty);
+					}
+				} else if (header & ISI_DCD) {
+				/* Carrier has been detected */
+					pr_debug("%s: DCD->high.\n",
+						__func__);
+					port->status |= ISI_DCD;
+					wake_up_interruptible(&port->port.open_wait);
+				}
+			} else {
+				if (header & ISI_DCD)
+					port->status |= ISI_DCD;
+				else
+					port->status &= ~ISI_DCD;
+			}
+
+			if (tty_port_cts_enabled(&port->port)) {
+				if (tty->hw_stopped) {
+					if (header & ISI_CTS) {
+						tty->hw_stopped = 0;
+						/* start tx ing */
+						port->status |= (ISI_TXOK
+							| ISI_CTS);
+						tty_wakeup(tty);
+					}
+				} else if (!(header & ISI_CTS)) {
+					tty->hw_stopped = 1;
+					/* stop tx ing */
+					port->status &= ~(ISI_TXOK | ISI_CTS);
+				}
+			} else {
+				if (header & ISI_CTS)
+					port->status |= ISI_CTS;
+				else
+					port->status &= ~ISI_CTS;
+			}
+
+			if (header & ISI_DSR)
+				port->status |= ISI_DSR;
+			else
+				port->status &= ~ISI_DSR;
+
+			if (header & ISI_RI)
+				port->status |= ISI_RI;
+			else
+				port->status &= ~ISI_RI;
+
+			break;
+
+		case 1:	/* Received Break !!! */
+			tty_insert_flip_char(&port->port, 0, TTY_BREAK);
+			if (port->port.flags & ASYNC_SAK)
+				do_SAK(tty);
+			tty_flip_buffer_push(&port->port);
+			break;
+
+		case 2:	/* Statistics		 */
+			pr_debug("%s: stats!!!\n", __func__);
+			break;
+
+		default:
+			pr_debug("%s: Unknown code in status packet.\n",
+				 __func__);
+			break;
+		}
+	} else {				/* Data   Packet */
+		count = tty_prepare_flip_string(&port->port, &rp,
+				byte_count & ~1);
+		pr_debug("%s: Can rx %d of %d bytes.\n",
+			 __func__, count, byte_count);
+		word_count = count >> 1;
+		insw(base, rp, word_count);
+		byte_count -= (word_count << 1);
+		if (count & 0x0001) {
+			tty_insert_flip_char(&port->port, inw(base) & 0xff,
+				TTY_NORMAL);
+			byte_count -= 2;
+		}
+		if (byte_count > 0) {
+			pr_debug("%s(0x%lx:%d): Flip buffer overflow! dropping bytes...\n",
+				 __func__, base, channel + 1);
+		/* drain out unread xtra data */
+		while (byte_count > 0) {
+				inw(base);
+				byte_count -= 2;
+			}
+		}
+		tty_flip_buffer_push(&port->port);
+	}
+	outw(0x0000, base+0x04); /* enable interrupts */
+	spin_unlock(&card->card_lock);
+	tty_kref_put(tty);
+
+	return IRQ_HANDLED;
+}
+
+static void isicom_config_port(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+	struct isi_board *card = port->card;
+	unsigned long baud;
+	unsigned long base = card->base;
+	u16 channel_setup, channel = port->channel,
+		shift_count = card->shift_count;
+	unsigned char flow_ctrl;
+
+	/* FIXME: Switch to new tty baud API */
+	baud = C_BAUD(tty);
+	if (baud & CBAUDEX) {
+		baud &= ~CBAUDEX;
+
+		/*  if CBAUDEX bit is on and the baud is set to either 50 or 75
+		 *  then the card is programmed for 57.6Kbps or 115Kbps
+		 *  respectively.
+		 */
+
+		/* 1,2,3,4 => 57.6, 115.2, 230, 460 kbps resp. */
+		if (baud < 1 || baud > 4)
+			tty->termios.c_cflag &= ~CBAUDEX;
+		else
+			baud += 15;
+	}
+	if (baud == 15) {
+
+		/*  the ASYNC_SPD_HI and ASYNC_SPD_VHI options are set
+		 *  by the set_serial_info ioctl ... this is done by
+		 *  the 'setserial' utility.
+		 */
+
+		if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+			baud++; /*  57.6 Kbps */
+		if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+			baud += 2; /*  115  Kbps */
+		if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+			baud += 3; /* 230 kbps*/
+		if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+			baud += 4; /* 460 kbps*/
+	}
+	if (linuxb_to_isib[baud] == -1) {
+		/* hang up */
+		drop_dtr(port);
+		return;
+	} else
+		raise_dtr(port);
+
+	if (WaitTillCardIsFree(base) == 0) {
+		outw(0x8000 | (channel << shift_count) | 0x03, base);
+		outw(linuxb_to_isib[baud] << 8 | 0x03, base);
+		channel_setup = 0;
+		switch (C_CSIZE(tty)) {
+		case CS5:
+			channel_setup |= ISICOM_CS5;
+			break;
+		case CS6:
+			channel_setup |= ISICOM_CS6;
+			break;
+		case CS7:
+			channel_setup |= ISICOM_CS7;
+			break;
+		case CS8:
+			channel_setup |= ISICOM_CS8;
+			break;
+		}
+
+		if (C_CSTOPB(tty))
+			channel_setup |= ISICOM_2SB;
+		if (C_PARENB(tty)) {
+			channel_setup |= ISICOM_EVPAR;
+			if (C_PARODD(tty))
+				channel_setup |= ISICOM_ODPAR;
+		}
+		outw(channel_setup, base);
+		InterruptTheCard(base);
+	}
+	tty_port_set_check_carrier(&port->port, !C_CLOCAL(tty));
+
+	/* flow control settings ...*/
+	flow_ctrl = 0;
+	tty_port_set_cts_flow(&port->port, C_CRTSCTS(tty));
+	if (C_CRTSCTS(tty))
+		flow_ctrl |= ISICOM_CTSRTS;
+	if (I_IXON(tty))
+		flow_ctrl |= ISICOM_RESPOND_XONXOFF;
+	if (I_IXOFF(tty))
+		flow_ctrl |= ISICOM_INITIATE_XONXOFF;
+
+	if (WaitTillCardIsFree(base) == 0) {
+		outw(0x8000 | (channel << shift_count) | 0x04, base);
+		outw(flow_ctrl << 8 | 0x05, base);
+		outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
+		InterruptTheCard(base);
+	}
+
+	/*	rx enabled -> enable port for rx on the card	*/
+	if (C_CREAD(tty)) {
+		card->port_status |= (1 << channel);
+		outw(card->port_status, base + 0x02);
+	}
+}
+
+/* open et all */
+
+static inline void isicom_setup_board(struct isi_board *bp)
+{
+	int channel;
+	struct isi_port *port;
+
+	bp->count++;
+	if (!(bp->status & BOARD_INIT)) {
+		port = bp->ports;
+		for (channel = 0; channel < bp->port_count; channel++, port++)
+			drop_dtr_rts(port);
+	}
+	bp->status |= BOARD_ACTIVE | BOARD_INIT;
+}
+
+/* Activate and thus setup board are protected from races against shutdown
+   by the tty_port mutex */
+
+static int isicom_activate(struct tty_port *tport, struct tty_struct *tty)
+{
+	struct isi_port *port = container_of(tport, struct isi_port, port);
+	struct isi_board *card = port->card;
+	unsigned long flags;
+
+	if (tty_port_alloc_xmit_buf(tport) < 0)
+		return -ENOMEM;
+
+	spin_lock_irqsave(&card->card_lock, flags);
+	isicom_setup_board(card);
+
+	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+
+	/*	discard any residual data	*/
+	if (WaitTillCardIsFree(card->base) == 0) {
+		outw(0x8000 | (port->channel << card->shift_count) | 0x02,
+				card->base);
+		outw(((ISICOM_KILLTX | ISICOM_KILLRX) << 8) | 0x06, card->base);
+		InterruptTheCard(card->base);
+	}
+	isicom_config_port(tty);
+	spin_unlock_irqrestore(&card->card_lock, flags);
+
+	return 0;
+}
+
+static int isicom_carrier_raised(struct tty_port *port)
+{
+	struct isi_port *ip = container_of(port, struct isi_port, port);
+	return (ip->status & ISI_DCD)?1 : 0;
+}
+
+static struct tty_port *isicom_find_port(struct tty_struct *tty)
+{
+	struct isi_port *port;
+	struct isi_board *card;
+	unsigned int board;
+	int line = tty->index;
+
+	board = BOARD(line);
+	card = &isi_card[board];
+
+	if (!(card->status & FIRMWARE_LOADED))
+		return NULL;
+
+	/*  open on a port greater than the port count for the card !!! */
+	if (line > ((board * 16) + card->port_count - 1))
+		return NULL;
+
+	port = &isi_ports[line];
+	if (isicom_paranoia_check(port, tty->name, "isicom_open"))
+		return NULL;
+
+	return &port->port;
+}
+
+static int isicom_open(struct tty_struct *tty, struct file *filp)
+{
+	struct isi_port *port;
+	struct tty_port *tport;
+
+	tport = isicom_find_port(tty);
+	if (tport == NULL)
+		return -ENODEV;
+	port = container_of(tport, struct isi_port, port);
+
+	tty->driver_data = port;
+	return tty_port_open(tport, tty, filp);
+}
+
+/* close et all */
+
+/* card->lock HAS to be held */
+static void isicom_shutdown_port(struct isi_port *port)
+{
+	struct isi_board *card = port->card;
+
+	if (--card->count < 0) {
+		pr_debug("%s: bad board(0x%lx) count %d.\n",
+			 __func__, card->base, card->count);
+		card->count = 0;
+	}
+	/* last port was closed, shutdown that board too */
+	if (!card->count)
+		card->status &= BOARD_ACTIVE;
+}
+
+static void isicom_flush_buffer(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+	struct isi_board *card = port->card;
+	unsigned long flags;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_flush_buffer"))
+		return;
+
+	spin_lock_irqsave(&card->card_lock, flags);
+	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+
+	tty_wakeup(tty);
+}
+
+static void isicom_shutdown(struct tty_port *port)
+{
+	struct isi_port *ip = container_of(port, struct isi_port, port);
+	struct isi_board *card = ip->card;
+	unsigned long flags;
+
+	/* indicate to the card that no more data can be received
+	   on this port */
+	spin_lock_irqsave(&card->card_lock, flags);
+	card->port_status &= ~(1 << ip->channel);
+	outw(card->port_status, card->base + 0x02);
+	isicom_shutdown_port(ip);
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	tty_port_free_xmit_buf(port);
+}
+
+static void isicom_close(struct tty_struct *tty, struct file *filp)
+{
+	struct isi_port *ip = tty->driver_data;
+	struct tty_port *port;
+
+	if (ip == NULL)
+		return;
+
+	port = &ip->port;
+	if (isicom_paranoia_check(ip, tty->name, "isicom_close"))
+		return;
+	tty_port_close(port, tty, filp);
+}
+
+/* write et all */
+static int isicom_write(struct tty_struct *tty,	const unsigned char *buf,
+	int count)
+{
+	struct isi_port *port = tty->driver_data;
+	struct isi_board *card = port->card;
+	unsigned long flags;
+	int cnt, total = 0;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_write"))
+		return 0;
+
+	spin_lock_irqsave(&card->card_lock, flags);
+
+	while (1) {
+		cnt = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt
+				- 1, SERIAL_XMIT_SIZE - port->xmit_head));
+		if (cnt <= 0)
+			break;
+
+		memcpy(port->port.xmit_buf + port->xmit_head, buf, cnt);
+		port->xmit_head = (port->xmit_head + cnt) & (SERIAL_XMIT_SIZE
+			- 1);
+		port->xmit_cnt += cnt;
+		buf += cnt;
+		count -= cnt;
+		total += cnt;
+	}
+	if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped)
+		port->status |= ISI_TXOK;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	return total;
+}
+
+/* put_char et all */
+static int isicom_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	struct isi_port *port = tty->driver_data;
+	struct isi_board *card = port->card;
+	unsigned long flags;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_put_char"))
+		return 0;
+
+	spin_lock_irqsave(&card->card_lock, flags);
+	if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
+		spin_unlock_irqrestore(&card->card_lock, flags);
+		return 0;
+	}
+
+	port->port.xmit_buf[port->xmit_head++] = ch;
+	port->xmit_head &= (SERIAL_XMIT_SIZE - 1);
+	port->xmit_cnt++;
+	spin_unlock_irqrestore(&card->card_lock, flags);
+	return 1;
+}
+
+/* flush_chars et all */
+static void isicom_flush_chars(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_flush_chars"))
+		return;
+
+	if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+			!port->port.xmit_buf)
+		return;
+
+	/* this tells the transmitter to consider this port for
+	   data output to the card ... that's the best we can do. */
+	port->status |= ISI_TXOK;
+}
+
+/* write_room et all */
+static int isicom_write_room(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+	int free;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_write_room"))
+		return 0;
+
+	free = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
+	if (free < 0)
+		free = 0;
+	return free;
+}
+
+/* chars_in_buffer et all */
+static int isicom_chars_in_buffer(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+	if (isicom_paranoia_check(port, tty->name, "isicom_chars_in_buffer"))
+		return 0;
+	return port->xmit_cnt;
+}
+
+/* ioctl et all */
+static int isicom_send_break(struct tty_struct *tty, int length)
+{
+	struct isi_port *port = tty->driver_data;
+	struct isi_board *card = port->card;
+	unsigned long base = card->base;
+
+	if (length == -1)
+		return -EOPNOTSUPP;
+
+	if (!lock_card(card))
+		return -EINVAL;
+
+	outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
+	outw((length & 0xff) << 8 | 0x00, base);
+	outw((length & 0xff00u), base);
+	InterruptTheCard(base);
+
+	unlock_card(card);
+	return 0;
+}
+
+static int isicom_tiocmget(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+	/* just send the port status */
+	u16 status = port->status;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+		return -ENODEV;
+
+	return  ((status & ISI_RTS) ? TIOCM_RTS : 0) |
+		((status & ISI_DTR) ? TIOCM_DTR : 0) |
+		((status & ISI_DCD) ? TIOCM_CAR : 0) |
+		((status & ISI_DSR) ? TIOCM_DSR : 0) |
+		((status & ISI_CTS) ? TIOCM_CTS : 0) |
+		((status & ISI_RI ) ? TIOCM_RI  : 0);
+}
+
+static int isicom_tiocmset(struct tty_struct *tty,
+					unsigned int set, unsigned int clear)
+{
+	struct isi_port *port = tty->driver_data;
+	unsigned long flags;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+		return -ENODEV;
+
+	spin_lock_irqsave(&port->card->card_lock, flags);
+	if (set & TIOCM_RTS)
+		raise_rts(port);
+	if (set & TIOCM_DTR)
+		raise_dtr(port);
+
+	if (clear & TIOCM_RTS)
+		drop_rts(port);
+	if (clear & TIOCM_DTR)
+		drop_dtr(port);
+	spin_unlock_irqrestore(&port->card->card_lock, flags);
+
+	return 0;
+}
+
+static int isicom_set_serial_info(struct tty_struct *tty,
+					struct serial_struct *ss)
+{
+	struct isi_port *port = tty->driver_data;
+	int reconfig_port;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+		return -ENODEV;
+
+	mutex_lock(&port->port.mutex);
+	reconfig_port = ((port->port.flags & ASYNC_SPD_MASK) !=
+		(ss->flags & ASYNC_SPD_MASK));
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		if ((ss->close_delay != port->port.close_delay) ||
+				(ss->closing_wait != port->port.closing_wait) ||
+				((ss->flags & ~ASYNC_USR_MASK) !=
+				(port->port.flags & ~ASYNC_USR_MASK))) {
+			mutex_unlock(&port->port.mutex);
+			return -EPERM;
+		}
+		port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
+				(ss->flags & ASYNC_USR_MASK));
+	} else {
+		port->port.close_delay = ss->close_delay;
+		port->port.closing_wait = ss->closing_wait;
+		port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
+				(ss->flags & ASYNC_FLAGS));
+	}
+	if (reconfig_port) {
+		unsigned long flags;
+		spin_lock_irqsave(&port->card->card_lock, flags);
+		isicom_config_port(tty);
+		spin_unlock_irqrestore(&port->card->card_lock, flags);
+	}
+	mutex_unlock(&port->port.mutex);
+	return 0;
+}
+
+static int isicom_get_serial_info(struct tty_struct *tty,
+	struct serial_struct *ss)
+{
+	struct isi_port *port = tty->driver_data;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+		return -ENODEV;
+
+	mutex_lock(&port->port.mutex);
+/*	ss->type = ? */
+	ss->line = port - isi_ports;
+	ss->port = port->card->base;
+	ss->irq = port->card->irq;
+	ss->flags = port->port.flags;
+/*	ss->baud_base = ? */
+	ss->close_delay = port->port.close_delay;
+	ss->closing_wait = port->port.closing_wait;
+	mutex_unlock(&port->port.mutex);
+	return 0;
+}
+
+/* set_termios et all */
+static void isicom_set_termios(struct tty_struct *tty,
+	struct ktermios *old_termios)
+{
+	struct isi_port *port = tty->driver_data;
+	unsigned long flags;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_set_termios"))
+		return;
+
+	if (tty->termios.c_cflag == old_termios->c_cflag &&
+			tty->termios.c_iflag == old_termios->c_iflag)
+		return;
+
+	spin_lock_irqsave(&port->card->card_lock, flags);
+	isicom_config_port(tty);
+	spin_unlock_irqrestore(&port->card->card_lock, flags);
+
+	if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
+		tty->hw_stopped = 0;
+		isicom_start(tty);
+	}
+}
+
+/* throttle et all */
+static void isicom_throttle(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+	struct isi_board *card = port->card;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_throttle"))
+		return;
+
+	/* tell the card that this port cannot handle any more data for now */
+	card->port_status &= ~(1 << port->channel);
+	outw(card->port_status, card->base + 0x02);
+}
+
+/* unthrottle et all */
+static void isicom_unthrottle(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+	struct isi_board *card = port->card;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_unthrottle"))
+		return;
+
+	/* tell the card that this port is ready to accept more data */
+	card->port_status |= (1 << port->channel);
+	outw(card->port_status, card->base + 0x02);
+}
+
+/* stop et all */
+static void isicom_stop(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_stop"))
+		return;
+
+	/* this tells the transmitter not to consider this port for
+	   data output to the card. */
+	port->status &= ~ISI_TXOK;
+}
+
+/* start et all */
+static void isicom_start(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_start"))
+		return;
+
+	/* this tells the transmitter to consider this port for
+	   data output to the card. */
+	port->status |= ISI_TXOK;
+}
+
+static void isicom_hangup(struct tty_struct *tty)
+{
+	struct isi_port *port = tty->driver_data;
+
+	if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
+		return;
+	tty_port_hangup(&port->port);
+}
+
+
+/*
+ * Driver init and deinit functions
+ */
+
+static const struct tty_operations isicom_ops = {
+	.open			= isicom_open,
+	.close			= isicom_close,
+	.write			= isicom_write,
+	.put_char		= isicom_put_char,
+	.flush_chars		= isicom_flush_chars,
+	.write_room		= isicom_write_room,
+	.chars_in_buffer	= isicom_chars_in_buffer,
+	.set_termios		= isicom_set_termios,
+	.throttle		= isicom_throttle,
+	.unthrottle		= isicom_unthrottle,
+	.stop			= isicom_stop,
+	.start			= isicom_start,
+	.hangup			= isicom_hangup,
+	.flush_buffer		= isicom_flush_buffer,
+	.tiocmget		= isicom_tiocmget,
+	.tiocmset		= isicom_tiocmset,
+	.break_ctl		= isicom_send_break,
+	.get_serial		= isicom_get_serial_info,
+	.set_serial		= isicom_set_serial_info,
+};
+
+static const struct tty_port_operations isicom_port_ops = {
+	.carrier_raised		= isicom_carrier_raised,
+	.dtr_rts		= isicom_dtr_rts,
+	.activate		= isicom_activate,
+	.shutdown		= isicom_shutdown,
+};
+
+static int reset_card(struct pci_dev *pdev,
+	const unsigned int card, unsigned int *signature)
+{
+	struct isi_board *board = pci_get_drvdata(pdev);
+	unsigned long base = board->base;
+	unsigned int sig, portcount = 0;
+	int retval = 0;
+
+	dev_dbg(&pdev->dev, "ISILoad:Resetting Card%d at 0x%lx\n", card + 1,
+		base);
+
+	inw(base + 0x8);
+
+	msleep(10);
+
+	outw(0, base + 0x8); /* Reset */
+
+	msleep(1000);
+
+	sig = inw(base + 0x4) & 0xff;
+
+	if (sig != 0xa5 && sig != 0xbb && sig != 0xcc && sig != 0xdd &&
+			sig != 0xee) {
+		dev_warn(&pdev->dev, "ISILoad:Card%u reset failure (Possible "
+			"bad I/O Port Address 0x%lx).\n", card + 1, base);
+		dev_dbg(&pdev->dev, "Sig=0x%x\n", sig);
+		retval = -EIO;
+		goto end;
+	}
+
+	msleep(10);
+
+	portcount = inw(base + 0x2);
+	if (!(inw(base + 0xe) & 0x1) || (portcount != 0 && portcount != 4 &&
+				portcount != 8 && portcount != 16)) {
+		dev_err(&pdev->dev, "ISILoad:PCI Card%d reset failure.\n",
+			card + 1);
+		retval = -EIO;
+		goto end;
+	}
+
+	switch (sig) {
+	case 0xa5:
+	case 0xbb:
+	case 0xdd:
+		board->port_count = (portcount == 4) ? 4 : 8;
+		board->shift_count = 12;
+		break;
+	case 0xcc:
+	case 0xee:
+		board->port_count = 16;
+		board->shift_count = 11;
+		break;
+	}
+	dev_info(&pdev->dev, "-Done\n");
+	*signature = sig;
+
+end:
+	return retval;
+}
+
+static int load_firmware(struct pci_dev *pdev,
+	const unsigned int index, const unsigned int signature)
+{
+	struct isi_board *board = pci_get_drvdata(pdev);
+	const struct firmware *fw;
+	unsigned long base = board->base;
+	unsigned int a;
+	u16 word_count, status;
+	int retval = -EIO;
+	char *name;
+	u8 *data;
+
+	struct stframe {
+		u16	addr;
+		u16	count;
+		u8	data[0];
+	} *frame;
+
+	switch (signature) {
+	case 0xa5:
+		name = "isi608.bin";
+		break;
+	case 0xbb:
+		name = "isi608em.bin";
+		break;
+	case 0xcc:
+		name = "isi616em.bin";
+		break;
+	case 0xdd:
+		name = "isi4608.bin";
+		break;
+	case 0xee:
+		name = "isi4616.bin";
+		break;
+	default:
+		dev_err(&pdev->dev, "Unknown signature.\n");
+		goto end;
+	}
+
+	retval = request_firmware(&fw, name, &pdev->dev);
+	if (retval)
+		goto end;
+
+	retval = -EIO;
+
+	for (frame = (struct stframe *)fw->data;
+			frame < (struct stframe *)(fw->data + fw->size);
+			frame = (struct stframe *)((u8 *)(frame + 1) +
+				frame->count)) {
+		if (WaitTillCardIsFree(base))
+			goto errrelfw;
+
+		outw(0xf0, base);	/* start upload sequence */
+		outw(0x00, base);
+		outw(frame->addr, base); /* lsb of address */
+
+		word_count = frame->count / 2 + frame->count % 2;
+		outw(word_count, base);
+		InterruptTheCard(base);
+
+		udelay(100); /* 0x2f */
+
+		if (WaitTillCardIsFree(base))
+			goto errrelfw;
+
+		status = inw(base + 0x4);
+		if (status != 0) {
+			dev_warn(&pdev->dev, "Card%d rejected load header:\n"
+				 "Address:0x%x\n"
+				 "Count:0x%x\n"
+				 "Status:0x%x\n",
+				 index + 1, frame->addr, frame->count, status);
+			goto errrelfw;
+		}
+		outsw(base, frame->data, word_count);
+
+		InterruptTheCard(base);
+
+		udelay(50); /* 0x0f */
+
+		if (WaitTillCardIsFree(base))
+			goto errrelfw;
+
+		status = inw(base + 0x4);
+		if (status != 0) {
+			dev_err(&pdev->dev, "Card%d got out of sync.Card "
+				"Status:0x%x\n", index + 1, status);
+			goto errrelfw;
+		}
+	}
+
+/* XXX: should we test it by reading it back and comparing with original like
+ * in load firmware package? */
+	for (frame = (struct stframe *)fw->data;
+			frame < (struct stframe *)(fw->data + fw->size);
+			frame = (struct stframe *)((u8 *)(frame + 1) +
+				frame->count)) {
+		if (WaitTillCardIsFree(base))
+			goto errrelfw;
+
+		outw(0xf1, base); /* start download sequence */
+		outw(0x00, base);
+		outw(frame->addr, base); /* lsb of address */
+
+		word_count = (frame->count >> 1) + frame->count % 2;
+		outw(word_count + 1, base);
+		InterruptTheCard(base);
+
+		udelay(50); /* 0xf */
+
+		if (WaitTillCardIsFree(base))
+			goto errrelfw;
+
+		status = inw(base + 0x4);
+		if (status != 0) {
+			dev_warn(&pdev->dev, "Card%d rejected verify header:\n"
+				 "Address:0x%x\n"
+				 "Count:0x%x\n"
+				 "Status: 0x%x\n",
+				 index + 1, frame->addr, frame->count, status);
+			goto errrelfw;
+		}
+
+		data = kmalloc_array(word_count, 2, GFP_KERNEL);
+		if (data == NULL) {
+			dev_err(&pdev->dev, "Card%d, firmware upload "
+				"failed, not enough memory\n", index + 1);
+			goto errrelfw;
+		}
+		inw(base);
+		insw(base, data, word_count);
+		InterruptTheCard(base);
+
+		for (a = 0; a < frame->count; a++)
+			if (data[a] != frame->data[a]) {
+				kfree(data);
+				dev_err(&pdev->dev, "Card%d, firmware upload "
+					"failed\n", index + 1);
+				goto errrelfw;
+			}
+		kfree(data);
+
+		udelay(50); /* 0xf */
+
+		if (WaitTillCardIsFree(base))
+			goto errrelfw;
+
+		status = inw(base + 0x4);
+		if (status != 0) {
+			dev_err(&pdev->dev, "Card%d verify got out of sync. "
+				"Card Status:0x%x\n", index + 1, status);
+			goto errrelfw;
+		}
+	}
+
+	/* xfer ctrl */
+	if (WaitTillCardIsFree(base))
+		goto errrelfw;
+
+	outw(0xf2, base);
+	outw(0x800, base);
+	outw(0x0, base);
+	outw(0x0, base);
+	InterruptTheCard(base);
+	outw(0x0, base + 0x4); /* for ISI4608 cards */
+
+	board->status |= FIRMWARE_LOADED;
+	retval = 0;
+
+errrelfw:
+	release_firmware(fw);
+end:
+	return retval;
+}
+
+/*
+ *	Insmod can set static symbols so keep these static
+ */
+static unsigned int card_count;
+
+static int isicom_probe(struct pci_dev *pdev,
+	const struct pci_device_id *ent)
+{
+	unsigned int signature, index;
+	int retval = -EPERM;
+	struct isi_board *board = NULL;
+
+	if (card_count >= BOARD_COUNT)
+		goto err;
+
+	retval = pci_enable_device(pdev);
+	if (retval) {
+		dev_err(&pdev->dev, "failed to enable\n");
+		goto err;
+	}
+
+	dev_info(&pdev->dev, "ISI PCI Card(Device ID 0x%x)\n", ent->device);
+
+	/* allot the first empty slot in the array */
+	for (index = 0; index < BOARD_COUNT; index++) {
+		if (isi_card[index].base == 0) {
+			board = &isi_card[index];
+			break;
+		}
+	}
+	if (index == BOARD_COUNT) {
+		retval = -ENODEV;
+		goto err_disable;
+	}
+
+	board->index = index;
+	board->base = pci_resource_start(pdev, 3);
+	board->irq = pdev->irq;
+	card_count++;
+
+	pci_set_drvdata(pdev, board);
+
+	retval = pci_request_region(pdev, 3, ISICOM_NAME);
+	if (retval) {
+		dev_err(&pdev->dev, "I/O Region 0x%lx-0x%lx is busy. Card%d "
+			"will be disabled.\n", board->base, board->base + 15,
+			index + 1);
+		retval = -EBUSY;
+		goto errdec;
+	}
+
+	retval = request_irq(board->irq, isicom_interrupt,
+			IRQF_SHARED, ISICOM_NAME, board);
+	if (retval < 0) {
+		dev_err(&pdev->dev, "Could not install handler at Irq %d. "
+			"Card%d will be disabled.\n", board->irq, index + 1);
+		goto errunrr;
+	}
+
+	retval = reset_card(pdev, index, &signature);
+	if (retval < 0)
+		goto errunri;
+
+	retval = load_firmware(pdev, index, signature);
+	if (retval < 0)
+		goto errunri;
+
+	for (index = 0; index < board->port_count; index++) {
+		struct tty_port *tport = &board->ports[index].port;
+		tty_port_init(tport);
+		tport->ops = &isicom_port_ops;
+		tport->close_delay = 50 * HZ/100;
+		tport->closing_wait = 3000 * HZ/100;
+		tty_port_register_device(tport, isicom_normal,
+				board->index * 16 + index, &pdev->dev);
+	}
+
+	return 0;
+
+errunri:
+	free_irq(board->irq, board);
+errunrr:
+	pci_release_region(pdev, 3);
+errdec:
+	board->base = 0;
+	card_count--;
+err_disable:
+	pci_disable_device(pdev);
+err:
+	return retval;
+}
+
+static void isicom_remove(struct pci_dev *pdev)
+{
+	struct isi_board *board = pci_get_drvdata(pdev);
+	unsigned int i;
+
+	for (i = 0; i < board->port_count; i++) {
+		tty_unregister_device(isicom_normal, board->index * 16 + i);
+		tty_port_destroy(&board->ports[i].port);
+	}
+
+	free_irq(board->irq, board);
+	pci_release_region(pdev, 3);
+	board->base = 0;
+	card_count--;
+	pci_disable_device(pdev);
+}
+
+static int __init isicom_init(void)
+{
+	int retval, idx, channel;
+	struct isi_port *port;
+
+	for (idx = 0; idx < BOARD_COUNT; idx++) {
+		port = &isi_ports[idx * 16];
+		isi_card[idx].ports = port;
+		spin_lock_init(&isi_card[idx].card_lock);
+		for (channel = 0; channel < 16; channel++, port++) {
+			port->magic = ISICOM_MAGIC;
+			port->card = &isi_card[idx];
+			port->channel = channel;
+			port->status = 0;
+			/*  . . .  */
+		}
+		isi_card[idx].base = 0;
+		isi_card[idx].irq = 0;
+	}
+
+	/* tty driver structure initialization */
+	isicom_normal = alloc_tty_driver(PORT_COUNT);
+	if (!isicom_normal) {
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	isicom_normal->name 			= "ttyM";
+	isicom_normal->major			= ISICOM_NMAJOR;
+	isicom_normal->minor_start		= 0;
+	isicom_normal->type			= TTY_DRIVER_TYPE_SERIAL;
+	isicom_normal->subtype			= SERIAL_TYPE_NORMAL;
+	isicom_normal->init_termios		= tty_std_termios;
+	isicom_normal->init_termios.c_cflag	= B9600 | CS8 | CREAD | HUPCL |
+		CLOCAL;
+	isicom_normal->flags			= TTY_DRIVER_REAL_RAW |
+		TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_HARDWARE_BREAK;
+	tty_set_operations(isicom_normal, &isicom_ops);
+
+	retval = tty_register_driver(isicom_normal);
+	if (retval) {
+		pr_debug("Couldn't register the dialin driver\n");
+		goto err_puttty;
+	}
+
+	retval = pci_register_driver(&isicom_driver);
+	if (retval < 0) {
+		pr_err("Unable to register pci driver.\n");
+		goto err_unrtty;
+	}
+
+	mod_timer(&tx, jiffies + 1);
+
+	return 0;
+err_unrtty:
+	tty_unregister_driver(isicom_normal);
+err_puttty:
+	put_tty_driver(isicom_normal);
+error:
+	return retval;
+}
+
+static void __exit isicom_exit(void)
+{
+	del_timer_sync(&tx);
+
+	pci_unregister_driver(&isicom_driver);
+	tty_unregister_driver(isicom_normal);
+	put_tty_driver(isicom_normal);
+}
+
+module_init(isicom_init);
+module_exit(isicom_exit);
+
+MODULE_AUTHOR("MultiTech");
+MODULE_DESCRIPTION("Driver for the ISI series of cards by MultiTech");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("isi608.bin");
+MODULE_FIRMWARE("isi608em.bin");
+MODULE_FIRMWARE("isi616em.bin");
+MODULE_FIRMWARE("isi4608.bin");
+MODULE_FIRMWARE("isi4616.bin");