tty: esp: remove broken driver

The ESP driver has been marked broken for years. It's an old ISA device
that clearly nobody cares about any more. Remove it

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 0 insertions, 2547 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 6aad99ec4e0f..6f31c9472100 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -201,19 +201,6 @@ config DIGIEPCA
 	  To compile this driver as a module, choose M here: the
 	  module will be called epca.
 
-config ESPSERIAL
-	tristate "Hayes ESP serial port support"
-	depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API && BROKEN
-	help
-	  This is a driver which supports Hayes ESP serial ports.  Both single
-	  port cards and multiport cards are supported.  Make sure to read
-	  <file:Documentation/hayes-esp.txt>.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called esp.
-
-	  If unsure, say N.
-
 config MOXA_INTELLIO
 	tristate "Moxa Intellio support"
 	depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 19a79dd79eee..f957edf7e45d 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -18,7 +18,6 @@ obj-$(CONFIG_CONSOLE_TRANSLATIONS) += consolemap.o consolemap_deftbl.o
 obj-$(CONFIG_HW_CONSOLE)	+= vt.o defkeymap.o
 obj-$(CONFIG_AUDIT)		+= tty_audit.o
 obj-$(CONFIG_MAGIC_SYSRQ)	+= sysrq.o
-obj-$(CONFIG_ESPSERIAL)		+= esp.o
 obj-$(CONFIG_MVME147_SCC)	+= generic_serial.o vme_scc.o
 obj-$(CONFIG_MVME162_SCC)	+= generic_serial.o vme_scc.o
 obj-$(CONFIG_BVME6000_SCC)	+= generic_serial.o vme_scc.o
diff --git a/drivers/char/esp.c b/drivers/char/esp.c
deleted file mode 100644
index b19d43cd9542..000000000000
--- a/drivers/char/esp.c
+++ /dev/null
@@ -1,2533 +0,0 @@
-/*
- *  esp.c - driver for Hayes ESP serial cards
- *
- *  --- Notices from serial.c, upon which this driver is based ---
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- *
- *  Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92.  Now
- *  much more extensible to support other serial cards based on the
- *  16450/16550A UART's.  Added support for the AST FourPort and the
- *  Accent Async board.
- *
- *  set_serial_info fixed to set the flags, custom divisor, and uart
- * 	type fields.  Fix suggested by Michael K. Johnson 12/12/92.
- *
- *  11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
- *
- *  03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
- *
- *  rs_set_termios fixed to look also for changes of the input
- *      flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
- *                                            Bernd Anhäupl 05/17/96.
- *
- * --- End of notices from serial.c ---
- *
- * Support for the ESP serial card by Andrew J. Robinson
- *     <arobinso@nyx.net> (Card detection routine taken from a patch
- *     by Dennis J. Boylan).  Patches to allow use with 2.1.x contributed
- *     by Chris Faylor.
- *
- * Most recent changes: (Andrew J. Robinson)
- *   Support for PIO mode.  This allows the driver to work properly with
- *     multiport cards.
- *
- * Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
- * several cleanups, use module_init/module_exit, etc
- *
- * This module exports the following rs232 io functions:
- *
- *	int espserial_init(void);
- */
-
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial.h>
-#include <linux/serialP.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/init.h>
-#include <linux/delay.h>
-#include <linux/bitops.h>
-
-#include <asm/system.h>
-#include <linux/io.h>
-
-#include <asm/dma.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-
-#include <linux/hayesesp.h>
-
-#define NR_PORTS 64	/* maximum number of ports */
-#define NR_PRIMARY 8	/* maximum number of primary ports */
-#define REGION_SIZE 8   /* size of io region to request */
-
-/* The following variables can be set by giving module options */
-static int irq[NR_PRIMARY];	/* IRQ for each base port */
-static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
-static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
-static unsigned int rx_trigger = ESP_RX_TRIGGER;
-static unsigned int tx_trigger = ESP_TX_TRIGGER;
-static unsigned int flow_off = ESP_FLOW_OFF;
-static unsigned int flow_on = ESP_FLOW_ON;
-static unsigned int rx_timeout = ESP_RX_TMOUT;
-static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
-
-MODULE_LICENSE("GPL");
-
-module_param_array(irq, int, NULL, 0);
-module_param_array(divisor, uint, NULL, 0);
-module_param(dma, uint, 0);
-module_param(rx_trigger, uint, 0);
-module_param(tx_trigger, uint, 0);
-module_param(flow_off, uint, 0);
-module_param(flow_on, uint, 0);
-module_param(rx_timeout, uint, 0);
-module_param(pio_threshold, uint, 0);
-
-/* END */
-
-static char *dma_buffer;
-static int dma_bytes;
-static struct esp_pio_buffer *free_pio_buf;
-
-#define DMA_BUFFER_SZ 1024
-
-#define WAKEUP_CHARS 1024
-
-static char serial_name[] __initdata = "ESP serial driver";
-static char serial_version[] __initdata = "2.2";
-
-static struct tty_driver *esp_driver;
-
-/*
- * Serial driver configuration section.  Here are the various options:
- *
- * SERIAL_PARANOIA_CHECK
- * 		Check the magic number for the esp_structure where
- * 		ever possible.
- */
-
-#undef SERIAL_PARANOIA_CHECK
-#define SERIAL_DO_RESTART
-
-#undef SERIAL_DEBUG_INTR
-#undef SERIAL_DEBUG_OPEN
-#undef SERIAL_DEBUG_FLOW
-
-#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
-#define DBG_CNT(s) printk(KERN_DEBUG "(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
-				tty->name, info->port.flags, \
-				serial_driver.refcount, \
-				info->port.count, tty->count, s)
-#else
-#define DBG_CNT(s)
-#endif
-
-static struct esp_struct *ports;
-
-static void change_speed(struct esp_struct *info);
-static void rs_wait_until_sent(struct tty_struct *, int);
-
-/*
- * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
- * times the normal 1.8432 Mhz clock of most serial boards).
- */
-#define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
-
-/* Standard COM flags (except for COM4, because of the 8514 problem) */
-#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
-
-static inline int serial_paranoia_check(struct esp_struct *info,
-					char *name, const char *routine)
-{
-#ifdef SERIAL_PARANOIA_CHECK
-	static const char badmagic[] = KERN_WARNING
-		"Warning: bad magic number for serial struct (%s) in %s\n";
-	static const char badinfo[] = KERN_WARNING
-		"Warning: null esp_struct for (%s) in %s\n";
-
-	if (!info) {
-		printk(badinfo, name, routine);
-		return 1;
-	}
-	if (info->magic != ESP_MAGIC) {
-		printk(badmagic, name, routine);
-		return 1;
-	}
-#endif
-	return 0;
-}
-
-static inline unsigned int serial_in(struct esp_struct *info, int offset)
-{
-	return inb(info->io_port + offset);
-}
-
-static inline void serial_out(struct esp_struct *info, int offset,
-			      unsigned char value)
-{
-	outb(value, info->io_port+offset);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_stop() and rs_start()
- *
- * This routines are called before setting or resetting tty->stopped.
- * They enable or disable transmitter interrupts, as necessary.
- * ------------------------------------------------------------
- */
-static void rs_stop(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_stop"))
-		return;
-
-	spin_lock_irqsave(&info->lock, flags);
-	if (info->IER & UART_IER_THRI) {
-		info->IER &= ~UART_IER_THRI;
-		serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-		serial_out(info, UART_ESI_CMD2, info->IER);
-	}
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void rs_start(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_start"))
-		return;
-
-	spin_lock_irqsave(&info->lock, flags);
-	if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
-		info->IER |= UART_IER_THRI;
-		serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-		serial_out(info, UART_ESI_CMD2, info->IER);
-	}
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-/*
- * ----------------------------------------------------------------------
- *
- * Here starts the interrupt handling routines.  All of the following
- * subroutines are declared as inline and are folded into
- * rs_interrupt().  They were separated out for readability's sake.
- *
- * Note: rs_interrupt() is a "fast" interrupt, which means that it
- * runs with interrupts turned off.  People who may want to modify
- * rs_interrupt() should try to keep the interrupt handler as fast as
- * possible.  After you are done making modifications, it is not a bad
- * idea to do:
- *
- * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
- *
- * and look at the resulting assemble code in serial.s.
- *
- * 				- Ted Ts'o (tytso@mit.edu), 7-Mar-93
- * -----------------------------------------------------------------------
- */
-
-static DEFINE_SPINLOCK(pio_lock);
-
-static inline struct esp_pio_buffer *get_pio_buffer(void)
-{
-	struct esp_pio_buffer *buf;
-	unsigned long flags;
-
-	spin_lock_irqsave(&pio_lock, flags);
-	if (free_pio_buf) {
-		buf = free_pio_buf;
-		free_pio_buf = buf->next;
-	} else {
-		buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
-	}
-	spin_unlock_irqrestore(&pio_lock, flags);
-	return buf;
-}
-
-static inline void release_pio_buffer(struct esp_pio_buffer *buf)
-{
-	unsigned long flags;
-	spin_lock_irqsave(&pio_lock, flags);
-	buf->next = free_pio_buf;
-	free_pio_buf = buf;
-	spin_unlock_irqrestore(&pio_lock, flags);
-}
-
-static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
-{
-	struct tty_struct *tty = info->port.tty;
-	int i;
-	struct esp_pio_buffer *pio_buf;
-	struct esp_pio_buffer *err_buf;
-	unsigned char status_mask;
-
-	pio_buf = get_pio_buffer();
-
-	if (!pio_buf)
-		return;
-
-	err_buf = get_pio_buffer();
-
-	if (!err_buf) {
-		release_pio_buffer(pio_buf);
-		return;
-	}
-
-	status_mask = (info->read_status_mask >> 2) & 0x07;
-
-	for (i = 0; i < num_bytes - 1; i += 2) {
-		*((unsigned short *)(pio_buf->data + i)) =
-			inw(info->io_port + UART_ESI_RX);
-		err_buf->data[i] = serial_in(info, UART_ESI_RWS);
-		err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
-		err_buf->data[i] &= status_mask;
-	}
-
-	if (num_bytes & 0x0001) {
-		pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
-		err_buf->data[num_bytes - 1] =
-			(serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
-	}
-
-	/* make sure everything is still ok since interrupts were enabled */
-	tty = info->port.tty;
-
-	if (!tty) {
-		release_pio_buffer(pio_buf);
-		release_pio_buffer(err_buf);
-		info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
-		return;
-	}
-
-	status_mask = (info->ignore_status_mask >> 2) & 0x07;
-
-	for (i = 0; i < num_bytes; i++) {
-		if (!(err_buf->data[i] & status_mask)) {
-			int flag = 0;
-
-			if (err_buf->data[i] & 0x04) {
-				flag = TTY_BREAK;
-				if (info->port.flags & ASYNC_SAK)
-					do_SAK(tty);
-			} else if (err_buf->data[i] & 0x02)
-				flag = TTY_FRAME;
-			else if (err_buf->data[i] & 0x01)
-				flag = TTY_PARITY;
-			tty_insert_flip_char(tty, pio_buf->data[i], flag);
-		}
-	}
-
-	tty_schedule_flip(tty);
-
-	info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
-	release_pio_buffer(pio_buf);
-	release_pio_buffer(err_buf);
-}
-
-static void program_isa_dma(int dma, int dir, unsigned long addr, int len)
-{
-	unsigned long flags;
-
-	flags = claim_dma_lock();
-	disable_dma(dma);
-	clear_dma_ff(dma);
-	set_dma_mode(dma, dir);
-	set_dma_addr(dma, addr);
-	set_dma_count(dma, len);
-	enable_dma(dma);
-	release_dma_lock(flags);
-}
-
-static void receive_chars_dma(struct esp_struct *info, int num_bytes)
-{
-	info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
-	dma_bytes = num_bytes;
-	info->stat_flags |= ESP_STAT_DMA_RX;
-
-	program_isa_dma(dma, DMA_MODE_READ, isa_virt_to_bus(dma_buffer),
-								dma_bytes);
-	serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
-}
-
-static inline void receive_chars_dma_done(struct esp_struct *info,
-					    int status)
-{
-	struct tty_struct *tty = info->port.tty;
-	int num_bytes;
-	unsigned long flags;
-
-	flags = claim_dma_lock();
-	disable_dma(dma);
-	clear_dma_ff(dma);
-
-	info->stat_flags &= ~ESP_STAT_DMA_RX;
-	num_bytes = dma_bytes - get_dma_residue(dma);
-	release_dma_lock(flags);
-
-	info->icount.rx += num_bytes;
-
-	if (num_bytes > 0) {
-		tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
-
-		status &= (0x1c & info->read_status_mask);
-
-		/* Is the status significant or do we throw the last byte ? */
-		if (!(status & info->ignore_status_mask)) {
-			int statflag = 0;
-
-			if (status & 0x10) {
-				statflag = TTY_BREAK;
-				(info->icount.brk)++;
-				if (info->port.flags & ASYNC_SAK)
-					do_SAK(tty);
-			} else if (status & 0x08) {
-				statflag = TTY_FRAME;
-				info->icount.frame++;
-			} else if (status & 0x04) {
-				statflag = TTY_PARITY;
-				info->icount.parity++;
-			}
-			tty_insert_flip_char(tty, dma_buffer[num_bytes - 1],
-								statflag);
-		}
-		tty_schedule_flip(tty);
-	}
-
-	if (dma_bytes != num_bytes) {
-		num_bytes = dma_bytes - num_bytes;
-		dma_bytes = 0;
-		receive_chars_dma(info, num_bytes);
-	} else
-		dma_bytes = 0;
-}
-
-/* Caller must hold info->lock */
-
-static inline void transmit_chars_pio(struct esp_struct *info,
-					int space_avail)
-{
-	int i;
-	struct esp_pio_buffer *pio_buf;
-
-	pio_buf = get_pio_buffer();
-
-	if (!pio_buf)
-		return;
-
-	while (space_avail && info->xmit_cnt) {
-		if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
-			memcpy(pio_buf->data,
-			       &(info->xmit_buf[info->xmit_tail]),
-			       space_avail);
-		} else {
-			i = ESP_XMIT_SIZE - info->xmit_tail;
-			memcpy(pio_buf->data,
-			       &(info->xmit_buf[info->xmit_tail]), i);
-			memcpy(&(pio_buf->data[i]), info->xmit_buf,
-			       space_avail - i);
-		}
-
-		info->xmit_cnt -= space_avail;
-		info->xmit_tail = (info->xmit_tail + space_avail) &
-			(ESP_XMIT_SIZE - 1);
-
-		for (i = 0; i < space_avail - 1; i += 2) {
-			outw(*((unsigned short *)(pio_buf->data + i)),
-			     info->io_port + UART_ESI_TX);
-		}
-
-		if (space_avail & 0x0001)
-			serial_out(info, UART_ESI_TX,
-				   pio_buf->data[space_avail - 1]);
-
-		if (info->xmit_cnt) {
-			serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
-			serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
-			space_avail = serial_in(info, UART_ESI_STAT1) << 8;
-			space_avail |= serial_in(info, UART_ESI_STAT2);
-
-			if (space_avail > info->xmit_cnt)
-				space_avail = info->xmit_cnt;
-		}
-	}
-
-	if (info->xmit_cnt < WAKEUP_CHARS) {
-		if (info->port.tty)
-			tty_wakeup(info->port.tty);
-
-#ifdef SERIAL_DEBUG_INTR
-		printk("THRE...");
-#endif
-
-		if (info->xmit_cnt <= 0) {
-			info->IER &= ~UART_IER_THRI;
-			serial_out(info, UART_ESI_CMD1,
-				   ESI_SET_SRV_MASK);
-			serial_out(info, UART_ESI_CMD2, info->IER);
-		}
-	}
-
-	release_pio_buffer(pio_buf);
-}
-
-/* Caller must hold info->lock */
-static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
-{
-	dma_bytes = num_bytes;
-
-	if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
-		memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
-		       dma_bytes);
-	} else {
-		int i = ESP_XMIT_SIZE - info->xmit_tail;
-		memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
-			i);
-		memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
-	}
-
-	info->xmit_cnt -= dma_bytes;
-	info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
-
-	if (info->xmit_cnt < WAKEUP_CHARS) {
-		if (info->port.tty)
-			tty_wakeup(info->port.tty);
-
-#ifdef SERIAL_DEBUG_INTR
-		printk("THRE...");
-#endif
-
-		if (info->xmit_cnt <= 0) {
-			info->IER &= ~UART_IER_THRI;
-			serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-			serial_out(info, UART_ESI_CMD2, info->IER);
-		}
-	}
-
-	info->stat_flags |= ESP_STAT_DMA_TX;
-
-	program_isa_dma(dma, DMA_MODE_WRITE, isa_virt_to_bus(dma_buffer),
-								dma_bytes);
-	serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
-}
-
-static inline void transmit_chars_dma_done(struct esp_struct *info)
-{
-	int num_bytes;
-	unsigned long flags;
-
-	flags = claim_dma_lock();
-	disable_dma(dma);
-	clear_dma_ff(dma);
-
-	num_bytes = dma_bytes - get_dma_residue(dma);
-	info->icount.tx += dma_bytes;
-	release_dma_lock(flags);
-
-	if (dma_bytes != num_bytes) {
-		dma_bytes -= num_bytes;
-		memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
-
-		program_isa_dma(dma, DMA_MODE_WRITE,
-				isa_virt_to_bus(dma_buffer), dma_bytes);
-
-		serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
-	} else {
-		dma_bytes = 0;
-		info->stat_flags &= ~ESP_STAT_DMA_TX;
-	}
-}
-
-static void check_modem_status(struct esp_struct *info)
-{
-	int	status;
-
-	serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
-	status = serial_in(info, UART_ESI_STAT2);
-
-	if (status & UART_MSR_ANY_DELTA) {
-		/* update input line counters */
-		if (status & UART_MSR_TERI)
-			info->icount.rng++;
-		if (status & UART_MSR_DDSR)
-			info->icount.dsr++;
-		if (status & UART_MSR_DDCD)
-			info->icount.dcd++;
-		if (status & UART_MSR_DCTS)
-			info->icount.cts++;
-		wake_up_interruptible(&info->port.delta_msr_wait);
-	}
-
-	if ((info->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
-#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
-		printk("ttys%d CD now %s...", info->line,
-		       (status & UART_MSR_DCD) ? "on" : "off");
-#endif
-		if (status & UART_MSR_DCD)
-			wake_up_interruptible(&info->port.open_wait);
-		else {
-#ifdef SERIAL_DEBUG_OPEN
-			printk("scheduling hangup...");
-#endif
-			tty_hangup(info->port.tty);
-		}
-	}
-}
-
-/*
- * This is the serial driver's interrupt routine
- */
-static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
-{
-	struct esp_struct *info;
-	unsigned err_status;
-	unsigned int scratch;
-
-#ifdef SERIAL_DEBUG_INTR
-	printk("rs_interrupt_single(%d)...", irq);
-#endif
-	info = (struct esp_struct *)dev_id;
-	err_status = 0;
-	scratch = serial_in(info, UART_ESI_SID);
-
-	spin_lock(&info->lock);
-
-	if (!info->port.tty) {
-		spin_unlock(&info->lock);
-		return IRQ_NONE;
-	}
-
-	if (scratch & 0x04) { /* error */
-		serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
-		err_status = serial_in(info, UART_ESI_STAT1);
-		serial_in(info, UART_ESI_STAT2);
-
-		if (err_status & 0x01)
-			info->stat_flags |= ESP_STAT_RX_TIMEOUT;
-
-		if (err_status & 0x20) /* UART status */
-			check_modem_status(info);
-
-		if (err_status & 0x80) /* Start break */
-			wake_up_interruptible(&info->break_wait);
-	}
-
-	if ((scratch & 0x88) || /* DMA completed or timed out */
-	    (err_status & 0x1c) /* receive error */) {
-		if (info->stat_flags & ESP_STAT_DMA_RX)
-			receive_chars_dma_done(info, err_status);
-		else if (info->stat_flags & ESP_STAT_DMA_TX)
-			transmit_chars_dma_done(info);
-	}
-
-	if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
-	    ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
-	    (info->IER & UART_IER_RDI)) {
-		int num_bytes;
-
-		serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
-		serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
-		num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
-		num_bytes |= serial_in(info, UART_ESI_STAT2);
-
-		num_bytes = tty_buffer_request_room(info->port.tty, num_bytes);
-
-		if (num_bytes) {
-			if (dma_bytes ||
-			    (info->stat_flags & ESP_STAT_USE_PIO) ||
-			    (num_bytes <= info->config.pio_threshold))
-				receive_chars_pio(info, num_bytes);
-			else
-				receive_chars_dma(info, num_bytes);
-		}
-	}
-
-	if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
-	    (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
-		if ((info->xmit_cnt <= 0) || info->port.tty->stopped) {
-			info->IER &= ~UART_IER_THRI;
-			serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-			serial_out(info, UART_ESI_CMD2, info->IER);
-		} else {
-			int num_bytes;
-
-			serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
-			serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
-			num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
-			num_bytes |= serial_in(info, UART_ESI_STAT2);
-
-			if (num_bytes > info->xmit_cnt)
-				num_bytes = info->xmit_cnt;
-
-			if (num_bytes) {
-				if (dma_bytes ||
-				    (info->stat_flags & ESP_STAT_USE_PIO) ||
-				    (num_bytes <= info->config.pio_threshold))
-					transmit_chars_pio(info, num_bytes);
-				else
-					transmit_chars_dma(info, num_bytes);
-			}
-		}
-	}
-
-	info->last_active = jiffies;
-
-#ifdef SERIAL_DEBUG_INTR
-	printk("end.\n");
-#endif
-	spin_unlock(&info->lock);
-	return IRQ_HANDLED;
-}
-
-/*
- * -------------------------------------------------------------------
- * Here ends the serial interrupt routines.
- * -------------------------------------------------------------------
- */
-
-/*
- * ---------------------------------------------------------------
- * Low level utility subroutines for the serial driver:  routines to
- * figure out the appropriate timeout for an interrupt chain, routines
- * to initialize and startup a serial port, and routines to shutdown a
- * serial port.  Useful stuff like that.
- *
- * Caller should hold lock
- * ---------------------------------------------------------------
- */
-
-static void esp_basic_init(struct esp_struct *info)
-{
-	/* put ESPC in enhanced mode */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
-
-	if (info->stat_flags & ESP_STAT_NEVER_DMA)
-		serial_out(info, UART_ESI_CMD2, 0x01);
-	else
-		serial_out(info, UART_ESI_CMD2, 0x31);
-
-	/* disable interrupts for now */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-	serial_out(info, UART_ESI_CMD2, 0x00);
-
-	/* set interrupt and DMA channel */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
-
-	if (info->stat_flags & ESP_STAT_NEVER_DMA)
-		serial_out(info, UART_ESI_CMD2, 0x01);
-	else
-		serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
-
-	serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
-
-	if (info->line % 8)	/* secondary port */
-		serial_out(info, UART_ESI_CMD2, 0x0d);	/* shared */
-	else if (info->irq == 9)
-		serial_out(info, UART_ESI_CMD2, 0x02);
-	else
-		serial_out(info, UART_ESI_CMD2, info->irq);
-
-	/* set error status mask (check this) */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
-
-	if (info->stat_flags & ESP_STAT_NEVER_DMA)
-		serial_out(info, UART_ESI_CMD2, 0xa1);
-	else
-		serial_out(info, UART_ESI_CMD2, 0xbd);
-
-	serial_out(info, UART_ESI_CMD2, 0x00);
-
-	/* set DMA timeout */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
-	serial_out(info, UART_ESI_CMD2, 0xff);
-
-	/* set FIFO trigger levels */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
-	serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
-	serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
-	serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
-	serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
-
-	/* Set clock scaling and wait states */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
-	serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
-
-	/* set reinterrupt pacing */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
-	serial_out(info, UART_ESI_CMD2, 0xff);
-}
-
-static int startup(struct esp_struct *info)
-{
-	unsigned long flags;
-	int	retval = 0;
-	unsigned int num_chars;
-
-	spin_lock_irqsave(&info->lock, flags);
-
-	if (info->port.flags & ASYNC_INITIALIZED)
-		goto out;
-
-	if (!info->xmit_buf) {
-		info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
-		retval = -ENOMEM;
-		if (!info->xmit_buf)
-			goto out;
-	}
-
-#ifdef SERIAL_DEBUG_OPEN
-	printk(KERN_DEBUG "starting up ttys%d (irq %d)...",
-						info->line, info->irq);
-#endif
-
-	/* Flush the RX buffer.  Using the ESI flush command may cause */
-	/* wild interrupts, so read all the data instead. */
-
-	serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
-	serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
-	num_chars = serial_in(info, UART_ESI_STAT1) << 8;
-	num_chars |= serial_in(info, UART_ESI_STAT2);
-
-	while (num_chars > 1) {
-		inw(info->io_port + UART_ESI_RX);
-		num_chars -= 2;
-	}
-
-	if (num_chars)
-		serial_in(info, UART_ESI_RX);
-
-	/* set receive character timeout */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
-	serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
-
-	/* clear all flags except the "never DMA" flag */
-	info->stat_flags &= ESP_STAT_NEVER_DMA;
-
-	if (info->stat_flags & ESP_STAT_NEVER_DMA)
-		info->stat_flags |= ESP_STAT_USE_PIO;
-
-	spin_unlock_irqrestore(&info->lock, flags);
-
-	/*
-	 * Allocate the IRQ
-	 */
-
-	retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
-			     "esp serial", info);
-
-	if (retval) {
-		if (capable(CAP_SYS_ADMIN)) {
-			if (info->port.tty)
-				set_bit(TTY_IO_ERROR,
-					&info->port.tty->flags);
-			retval = 0;
-		}
-		goto out_unlocked;
-	}
-
-	if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
-		dma_buffer = (char *)__get_dma_pages(
-			GFP_KERNEL, get_order(DMA_BUFFER_SZ));
-
-		/* use PIO mode if DMA buf/chan cannot be allocated */
-		if (!dma_buffer)
-			info->stat_flags |= ESP_STAT_USE_PIO;
-		else if (request_dma(dma, "esp serial")) {
-			free_pages((unsigned long)dma_buffer,
-				   get_order(DMA_BUFFER_SZ));
-			dma_buffer = NULL;
-			info->stat_flags |= ESP_STAT_USE_PIO;
-		}
-
-	}
-
-	info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
-
-	spin_lock_irqsave(&info->lock, flags);
-	serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
-	serial_out(info, UART_ESI_CMD2, UART_MCR);
-	serial_out(info, UART_ESI_CMD2, info->MCR);
-
-	/*
-	 * Finally, enable interrupts
-	 */
-	/* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
-	info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
-			UART_IER_DMA_TC;
-	serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-	serial_out(info, UART_ESI_CMD2, info->IER);
-
-	if (info->port.tty)
-		clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
-	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
-	spin_unlock_irqrestore(&info->lock, flags);
-
-	/*
-	 * Set up the tty->alt_speed kludge
-	 */
-	if (info->port.tty) {
-		if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
-			info->port.tty->alt_speed = 57600;
-		if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
-			info->port.tty->alt_speed = 115200;
-		if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
-			info->port.tty->alt_speed = 230400;
-		if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
-			info->port.tty->alt_speed = 460800;
-	}
-
-	/*
-	 * set the speed of the serial port
-	 */
-	change_speed(info);
-	info->port.flags |= ASYNC_INITIALIZED;
-	return 0;
-
-out:
-	spin_unlock_irqrestore(&info->lock, flags);
-out_unlocked:
-	return retval;
-}
-
-/*
- * This routine will shutdown a serial port; interrupts are disabled, and
- * DTR is dropped if the hangup on close termio flag is on.
- */
-static void shutdown(struct esp_struct *info)
-{
-	unsigned long	flags, f;
-
-	if (!(info->port.flags & ASYNC_INITIALIZED))
-		return;
-
-#ifdef SERIAL_DEBUG_OPEN
-	printk("Shutting down serial port %d (irq %d)....", info->line,
-	       info->irq);
-#endif
-
-	spin_lock_irqsave(&info->lock, 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);
-	wake_up_interruptible(&info->break_wait);
-
-	/* stop a DMA transfer on the port being closed */
-	/* DMA lock is higher priority always */
-	if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
-		f = claim_dma_lock();
-		disable_dma(dma);
-		clear_dma_ff(dma);
-		release_dma_lock(f);
-
-		dma_bytes = 0;
-	}
-
-	/*
-	 * Free the IRQ
-	 */
-	free_irq(info->irq, info);
-
-	if (dma_buffer) {
-		struct esp_struct *current_port = ports;
-
-		while (current_port) {
-			if ((current_port != info) &&
-			    (current_port->port.flags & ASYNC_INITIALIZED))
-				break;
-
-			current_port = current_port->next_port;
-		}
-
-		if (!current_port) {
-			free_dma(dma);
-			free_pages((unsigned long)dma_buffer,
-				   get_order(DMA_BUFFER_SZ));
-			dma_buffer = NULL;
-		}
-	}
-
-	if (info->xmit_buf) {
-		free_page((unsigned long) info->xmit_buf);
-		info->xmit_buf = NULL;
-	}
-
-	info->IER = 0;
-	serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-	serial_out(info, UART_ESI_CMD2, 0x00);
-
-	if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
-		info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
-
-	info->MCR &= ~UART_MCR_OUT2;
-	serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
-	serial_out(info, UART_ESI_CMD2, UART_MCR);
-	serial_out(info, UART_ESI_CMD2, info->MCR);
-
-	if (info->port.tty)
-		set_bit(TTY_IO_ERROR, &info->port.tty->flags);
-
-	info->port.flags &= ~ASYNC_INITIALIZED;
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-/*
- * This routine is called to set the UART divisor registers to match
- * the specified baud rate for a serial port.
- */
-static void change_speed(struct esp_struct *info)
-{
-	unsigned short port;
-	int	quot = 0;
-	unsigned cflag, cval;
-	int	baud, bits;
-	unsigned char flow1 = 0, flow2 = 0;
-	unsigned long flags;
-
-	if (!info->port.tty || !info->port.tty->termios)
-		return;
-	cflag = info->port.tty->termios->c_cflag;
-	port = info->io_port;
-
-	/* byte size and parity */
-	switch (cflag & CSIZE) {
-	case CS5: cval = 0x00; bits = 7; break;
-	case CS6: cval = 0x01; bits = 8; break;
-	case CS7: cval = 0x02; bits = 9; break;
-	case CS8: cval = 0x03; bits = 10; break;
-	default:  cval = 0x00; bits = 7; break;
-	}
-	if (cflag & CSTOPB) {
-		cval |= 0x04;
-		bits++;
-	}
-	if (cflag & PARENB) {
-		cval |= UART_LCR_PARITY;
-		bits++;
-	}
-	if (!(cflag & PARODD))
-		cval |= UART_LCR_EPAR;
-#ifdef CMSPAR
-	if (cflag & CMSPAR)
-		cval |= UART_LCR_SPAR;
-#endif
-	baud = tty_get_baud_rate(info->port.tty);
-	if (baud == 38400 &&
-		((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
-		quot = info->custom_divisor;
-	else {
-		if (baud == 134) /* Special case since 134 is really 134.5 */
-			quot = (2*BASE_BAUD / 269);
-		else if (baud)
-			quot = BASE_BAUD / baud;
-	}
-	/* If the quotient is ever zero, default to 9600 bps */
-	if (!quot)
-		quot = BASE_BAUD / 9600;
-
-	if (baud) {
-		/* Actual rate */
-		baud = BASE_BAUD/quot;
-		tty_encode_baud_rate(info->port.tty, baud, baud);
-	}
-	info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
-
-	/* CTS flow control flag and modem status interrupts */
-	/* info->IER &= ~UART_IER_MSI; */
-	if (cflag & CRTSCTS) {
-		info->port.flags |= ASYNC_CTS_FLOW;
-		/* info->IER |= UART_IER_MSI; */
-		flow1 = 0x04;
-		flow2 = 0x10;
-	} else
-		info->port.flags &= ~ASYNC_CTS_FLOW;
-	if (cflag & CLOCAL)
-		info->port.flags &= ~ASYNC_CHECK_CD;
-	else
-		info->port.flags |= ASYNC_CHECK_CD;
-
-	/*
-	 * Set up parity check flag
-	 */
-	info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
-	if (I_INPCK(info->port.tty))
-		info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
-	if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
-		info->read_status_mask |= UART_LSR_BI;
-
-	info->ignore_status_mask = 0;
-#if 0
-	/* This should be safe, but for some broken bits of hardware... */
-	if (I_IGNPAR(info->port.tty)) {
-		info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
-		info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
-	}
-#endif
-	if (I_IGNBRK(info->port.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(info->port.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 (I_IXOFF(info->port.tty))
-		flow1 |= 0x81;
-
-	spin_lock_irqsave(&info->lock, flags);
-	/* set baud */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
-	serial_out(info, UART_ESI_CMD2, quot >> 8);
-	serial_out(info, UART_ESI_CMD2, quot & 0xff);
-
-	/* set data bits, parity, etc. */
-	serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
-	serial_out(info, UART_ESI_CMD2, UART_LCR);
-	serial_out(info, UART_ESI_CMD2, cval);
-
-	/* Enable flow control */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
-	serial_out(info, UART_ESI_CMD2, flow1);
-	serial_out(info, UART_ESI_CMD2, flow2);
-
-	/* set flow control characters (XON/XOFF only) */
-	if (I_IXOFF(info->port.tty)) {
-		serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
-		serial_out(info, UART_ESI_CMD2, START_CHAR(info->port.tty));
-		serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->port.tty));
-		serial_out(info, UART_ESI_CMD2, 0x10);
-		serial_out(info, UART_ESI_CMD2, 0x21);
-		switch (cflag & CSIZE) {
-		case CS5:
-			serial_out(info, UART_ESI_CMD2, 0x1f);
-			break;
-		case CS6:
-			serial_out(info, UART_ESI_CMD2, 0x3f);
-			break;
-		case CS7:
-		case CS8:
-			serial_out(info, UART_ESI_CMD2, 0x7f);
-			break;
-		default:
-			serial_out(info, UART_ESI_CMD2, 0xff);
-			break;
-		}
-	}
-
-	/* Set high/low water */
-	serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
-	serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
-	serial_out(info, UART_ESI_CMD2, info->config.flow_off);
-	serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
-	serial_out(info, UART_ESI_CMD2, info->config.flow_on);
-
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static int rs_put_char(struct tty_struct *tty, unsigned char ch)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-	int ret = 0;
-
-	if (serial_paranoia_check(info, tty->name, "rs_put_char"))
-		return 0;
-
-	if (!info->xmit_buf)
-		return 0;
-
-	spin_lock_irqsave(&info->lock, flags);
-	if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
-		info->xmit_buf[info->xmit_head++] = ch;
-		info->xmit_head &= ESP_XMIT_SIZE-1;
-		info->xmit_cnt++;
-		ret = 1;
-	}
-	spin_unlock_irqrestore(&info->lock, flags);
-	return ret;
-}
-
-static void rs_flush_chars(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
-		return;
-
-	spin_lock_irqsave(&info->lock, flags);
-
-	if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
-		goto out;
-
-	if (!(info->IER & UART_IER_THRI)) {
-		info->IER |= UART_IER_THRI;
-		serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-		serial_out(info, UART_ESI_CMD2, info->IER);
-	}
-out:
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static int rs_write(struct tty_struct *tty,
-		    const unsigned char *buf, int count)
-{
-	int	c, t, ret = 0;
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_write"))
-		return 0;
-
-	if (!info->xmit_buf)
-		return 0;
-
-	while (1) {
-		/* Thanks to R. Wolff for suggesting how to do this with */
-		/* interrupts enabled */
-
-		c = count;
-		t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
-
-		if (t < c)
-			c = t;
-
-		t = ESP_XMIT_SIZE - info->xmit_head;
-
-		if (t < c)
-			c = t;
-
-		if (c <= 0)
-			break;
-
-		memcpy(info->xmit_buf + info->xmit_head, buf, c);
-
-		info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
-		info->xmit_cnt += c;
-		buf += c;
-		count -= c;
-		ret += c;
-	}
-
-	spin_lock_irqsave(&info->lock, flags);
-
-	if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
-		info->IER |= UART_IER_THRI;
-		serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-		serial_out(info, UART_ESI_CMD2, info->IER);
-	}
-
-	spin_unlock_irqrestore(&info->lock, flags);
-	return ret;
-}
-
-static int rs_write_room(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-	int	ret;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_write_room"))
-		return 0;
-
-	spin_lock_irqsave(&info->lock, flags);
-
-	ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
-	if (ret < 0)
-		ret = 0;
-	spin_unlock_irqrestore(&info->lock, flags);
-	return ret;
-}
-
-static int rs_chars_in_buffer(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-
-	if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
-		return 0;
-	return info->xmit_cnt;
-}
-
-static void rs_flush_buffer(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
-		return;
-	spin_lock_irqsave(&info->lock, flags);
-	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
-	spin_unlock_irqrestore(&info->lock, flags);
-	tty_wakeup(tty);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_throttle()
- *
- * This routine is called by the upper-layer tty layer to signal that
- * incoming characters should be throttled.
- * ------------------------------------------------------------
- */
-static void rs_throttle(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-#ifdef SERIAL_DEBUG_THROTTLE
-	char	buf[64];
-
-	printk("throttle %s: %d....\n", tty_name(tty, buf),
-						tty_chars_in_buffer(tty));
-#endif
-
-	if (serial_paranoia_check(info, tty->name, "rs_throttle"))
-		return;
-
-	spin_lock_irqsave(&info->lock, flags);
-	info->IER &= ~UART_IER_RDI;
-	serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-	serial_out(info, UART_ESI_CMD2, info->IER);
-	serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
-	serial_out(info, UART_ESI_CMD2, 0x00);
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void rs_unthrottle(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-#ifdef SERIAL_DEBUG_THROTTLE
-	char	buf[64];
-
-	printk(KERN_DEBUG "unthrottle %s: %d....\n", tty_name(tty, buf),
-	       tty_chars_in_buffer(tty));
-#endif
-
-	if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
-		return;
-
-	spin_lock_irqsave(&info->lock, flags);
-	info->IER |= UART_IER_RDI;
-	serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-	serial_out(info, UART_ESI_CMD2, info->IER);
-	serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
-	serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_ioctl() and friends
- * ------------------------------------------------------------
- */
-
-static int get_serial_info(struct esp_struct *info,
-			   struct serial_struct __user *retinfo)
-{
-	struct serial_struct tmp;
-
-	lock_kernel();
-	memset(&tmp, 0, sizeof(tmp));
-	tmp.type = PORT_16550A;
-	tmp.line = info->line;
-	tmp.port = info->io_port;
-	tmp.irq = info->irq;
-	tmp.flags = info->port.flags;
-	tmp.xmit_fifo_size = 1024;
-	tmp.baud_base = BASE_BAUD;
-	tmp.close_delay = info->close_delay;
-	tmp.closing_wait = info->closing_wait;
-	tmp.custom_divisor = info->custom_divisor;
-	tmp.hub6 = 0;
-	unlock_kernel();
-	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
-		return -EFAULT;
-	return 0;
-}
-
-static int get_esp_config(struct esp_struct *info,
-			  struct hayes_esp_config __user *retinfo)
-{
-	struct hayes_esp_config tmp;
-
-	if (!retinfo)
-		return -EFAULT;
-
-	memset(&tmp, 0, sizeof(tmp));
-	lock_kernel();
-	tmp.rx_timeout = info->config.rx_timeout;
-	tmp.rx_trigger = info->config.rx_trigger;
-	tmp.tx_trigger = info->config.tx_trigger;
-	tmp.flow_off = info->config.flow_off;
-	tmp.flow_on = info->config.flow_on;
-	tmp.pio_threshold = info->config.pio_threshold;
-	tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
-	unlock_kernel();
-
-	return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
-}
-
-static int set_serial_info(struct esp_struct *info,
-			   struct serial_struct __user *new_info)
-{
-	struct serial_struct new_serial;
-	struct esp_struct old_info;
-	unsigned int change_irq;
-	int retval = 0;
-	struct esp_struct *current_async;
-
-	if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
-		return -EFAULT;
-	old_info = *info;
-
-	if ((new_serial.type != PORT_16550A) ||
-	    (new_serial.hub6) ||
-	    (info->io_port != new_serial.port) ||
-	    (new_serial.baud_base != BASE_BAUD) ||
-	    (new_serial.irq > 15) ||
-	    (new_serial.irq < 2) ||
-	    (new_serial.irq == 6) ||
-	    (new_serial.irq == 8) ||
-	    (new_serial.irq == 13))
-		return -EINVAL;
-
-	change_irq = new_serial.irq != info->irq;
-
-	if (change_irq && (info->line % 8))
-		return -EINVAL;
-
-	if (!capable(CAP_SYS_ADMIN)) {
-		if (change_irq ||
-		    (new_serial.close_delay != info->close_delay) ||
-		    ((new_serial.flags & ~ASYNC_USR_MASK) !=
-		     (info->port.flags & ~ASYNC_USR_MASK)))
-			return -EPERM;
-		info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
-			       (new_serial.flags & ASYNC_USR_MASK));
-		info->custom_divisor = new_serial.custom_divisor;
-	} else {
-		if (new_serial.irq == 2)
-			new_serial.irq = 9;
-
-		if (change_irq) {
-			current_async = ports;
-
-			while (current_async) {
-				if ((current_async->line >= info->line) &&
-				    (current_async->line < (info->line + 8))) {
-					if (current_async == info) {
-						if (current_async->port.count > 1)
-							return -EBUSY;
-					} else if (current_async->port.count)
-						return -EBUSY;
-				}
-
-				current_async = current_async->next_port;
-			}
-		}
-
-		/*
-		 * OK, past this point, all the error checking has been done.
-		 * At this point, we start making changes.....
-		 */
-
-		info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
-			       (new_serial.flags & ASYNC_FLAGS));
-		info->custom_divisor = new_serial.custom_divisor;
-		info->close_delay = new_serial.close_delay * HZ/100;
-		info->closing_wait = new_serial.closing_wait * HZ/100;
-
-		if (change_irq) {
-			/*
-			 * We need to shutdown the serial port at the old
-			 * port/irq combination.
-			 */
-			shutdown(info);
-
-			current_async = ports;
-
-			while (current_async) {
-				if ((current_async->line >= info->line) &&
-				    (current_async->line < (info->line + 8)))
-					current_async->irq = new_serial.irq;
-
-				current_async = current_async->next_port;
-			}
-
-			serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
-			if (info->irq == 9)
-				serial_out(info, UART_ESI_CMD2, 0x02);
-			else
-				serial_out(info, UART_ESI_CMD2, info->irq);
-		}
-	}
-
-	if (info->port.flags & ASYNC_INITIALIZED) {
-		if (((old_info.port.flags & ASYNC_SPD_MASK) !=
-		     (info->port.flags & ASYNC_SPD_MASK)) ||
-		    (old_info.custom_divisor != info->custom_divisor)) {
-			if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
-				info->port.tty->alt_speed = 57600;
-			if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
-				info->port.tty->alt_speed = 115200;
-			if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
-				info->port.tty->alt_speed = 230400;
-			if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
-				info->port.tty->alt_speed = 460800;
-			change_speed(info);
-		}
-	} else
-		retval = startup(info);
-
-	return retval;
-}
-
-static int set_esp_config(struct esp_struct *info,
-			  struct hayes_esp_config __user *new_info)
-{
-	struct hayes_esp_config new_config;
-	unsigned int change_dma;
-	int retval = 0;
-	struct esp_struct *current_async;
-	unsigned long flags;
-
-	/* Perhaps a non-sysadmin user should be able to do some of these */
-	/* operations.  I haven't decided yet. */
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	if (copy_from_user(&new_config, new_info, sizeof(new_config)))
-		return -EFAULT;
-
-	if ((new_config.flow_on >= new_config.flow_off) ||
-	    (new_config.rx_trigger < 1) ||
-	    (new_config.tx_trigger < 1) ||
-	    (new_config.flow_off < 1) ||
-	    (new_config.flow_on < 1) ||
-	    (new_config.rx_trigger > 1023) ||
-	    (new_config.tx_trigger > 1023) ||
-	    (new_config.flow_off > 1023) ||
-	    (new_config.flow_on > 1023) ||
-	    (new_config.pio_threshold < 0) ||
-	    (new_config.pio_threshold > 1024))
-		return -EINVAL;
-
-	if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
-		new_config.dma_channel = 0;
-
-	if (info->stat_flags & ESP_STAT_NEVER_DMA)
-		change_dma = new_config.dma_channel;
-	else
-		change_dma = (new_config.dma_channel != dma);
-
-	if (change_dma) {
-		if (new_config.dma_channel) {
-			/* PIO mode to DMA mode transition OR */
-			/* change current DMA channel */
-			current_async = ports;
-
-			while (current_async) {
-				if (current_async == info) {
-					if (current_async->port.count > 1)
-						return -EBUSY;
-				} else if (current_async->port.count)
-					return -EBUSY;
-
-				current_async = current_async->next_port;
-			}
-
-			shutdown(info);
-			dma = new_config.dma_channel;
-			info->stat_flags &= ~ESP_STAT_NEVER_DMA;
-
-			/* all ports must use the same DMA channel */
-
-			spin_lock_irqsave(&info->lock, flags);
-			current_async = ports;
-
-			while (current_async) {
-				esp_basic_init(current_async);
-				current_async = current_async->next_port;
-			}
-			spin_unlock_irqrestore(&info->lock, flags);
-		} else {
-			/* DMA mode to PIO mode only */
-			if (info->port.count > 1)
-				return -EBUSY;
-
-			shutdown(info);
-			spin_lock_irqsave(&info->lock, flags);
-			info->stat_flags |= ESP_STAT_NEVER_DMA;
-			esp_basic_init(info);
-			spin_unlock_irqrestore(&info->lock, flags);
-		}
-	}
-
-	info->config.pio_threshold = new_config.pio_threshold;
-
-	if ((new_config.flow_off != info->config.flow_off) ||
-	    (new_config.flow_on != info->config.flow_on)) {
-		info->config.flow_off = new_config.flow_off;
-		info->config.flow_on = new_config.flow_on;
-
-		spin_lock_irqsave(&info->lock, flags);
-		serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
-		serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
-		serial_out(info, UART_ESI_CMD2, new_config.flow_off);
-		serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
-		serial_out(info, UART_ESI_CMD2, new_config.flow_on);
-		spin_unlock_irqrestore(&info->lock, flags);
-	}
-
-	if ((new_config.rx_trigger != info->config.rx_trigger) ||
-	    (new_config.tx_trigger != info->config.tx_trigger)) {
-		info->config.rx_trigger = new_config.rx_trigger;
-		info->config.tx_trigger = new_config.tx_trigger;
-		spin_lock_irqsave(&info->lock, flags);
-		serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
-		serial_out(info, UART_ESI_CMD2,
-			   new_config.rx_trigger >> 8);
-		serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
-		serial_out(info, UART_ESI_CMD2,
-			   new_config.tx_trigger >> 8);
-		serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
-		spin_unlock_irqrestore(&info->lock, flags);
-	}
-
-	if (new_config.rx_timeout != info->config.rx_timeout) {
-		info->config.rx_timeout = new_config.rx_timeout;
-		spin_lock_irqsave(&info->lock, flags);
-
-		if (info->IER & UART_IER_RDI) {
-			serial_out(info, UART_ESI_CMD1,
-				   ESI_SET_RX_TIMEOUT);
-			serial_out(info, UART_ESI_CMD2,
-				   new_config.rx_timeout);
-		}
-
-		spin_unlock_irqrestore(&info->lock, flags);
-	}
-
-	if (!(info->port.flags & ASYNC_INITIALIZED))
-		retval = startup(info);
-
-	return retval;
-}
-
-/*
- * 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 get_lsr_info(struct esp_struct *info, unsigned int __user *value)
-{
-	unsigned char status;
-	unsigned int result;
-	unsigned long flags;
-
-	spin_lock_irqsave(&info->lock, flags);
-	serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
-	status = serial_in(info, UART_ESI_STAT1);
-	spin_unlock_irqrestore(&info->lock, flags);
-	result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
-	return put_user(result, value);
-}
-
-
-static int esp_tiocmget(struct tty_struct *tty, struct file *file)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned char control, status;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, __func__))
-		return -ENODEV;
-	if (tty->flags & (1 << TTY_IO_ERROR))
-		return -EIO;
-
-	control = info->MCR;
-
-	spin_lock_irqsave(&info->lock, flags);
-	serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
-	status = serial_in(info, UART_ESI_STAT2);
-	spin_unlock_irqrestore(&info->lock, 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 esp_tiocmset(struct tty_struct *tty, struct file *file,
-			unsigned int set, unsigned int clear)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, __func__))
-		return -ENODEV;
-	if (tty->flags & (1 << TTY_IO_ERROR))
-		return -EIO;
-
-	spin_lock_irqsave(&info->lock, 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;
-
-	serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
-	serial_out(info, UART_ESI_CMD2, UART_MCR);
-	serial_out(info, UART_ESI_CMD2, info->MCR);
-
-	spin_unlock_irqrestore(&info->lock, flags);
-	return 0;
-}
-
-/*
- * rs_break() --- routine which turns the break handling on or off
- */
-static int esp_break(struct tty_struct *tty, int break_state)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "esp_break"))
-		return -EINVAL;
-
-	if (break_state == -1) {
-		spin_lock_irqsave(&info->lock, flags);
-		serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
-		serial_out(info, UART_ESI_CMD2, 0x01);
-		spin_unlock_irqrestore(&info->lock, flags);
-
-		/* FIXME - new style wait needed here */
-		interruptible_sleep_on(&info->break_wait);
-	} else {
-		spin_lock_irqsave(&info->lock, flags);
-		serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
-		serial_out(info, UART_ESI_CMD2, 0x00);
-		spin_unlock_irqrestore(&info->lock, flags);
-	}
-	return 0;
-}
-
-static int rs_ioctl(struct tty_struct *tty, struct file *file,
-		    unsigned int cmd, unsigned long arg)
-{
-	struct esp_struct *info = tty->driver_data;
-	struct async_icount cprev, cnow;	/* kernel counter temps */
-	struct serial_icounter_struct __user *p_cuser;	/* user space */
-	void __user *argp = (void __user *)arg;
-	unsigned long flags;
-	int ret;
-
-	if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
-		return -ENODEV;
-
-	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
-	    (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
-	    (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
-	    (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
-	    (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
-		if (tty->flags & (1 << TTY_IO_ERROR))
-		    return -EIO;
-	}
-
-	switch (cmd) {
-	case TIOCGSERIAL:
-		return get_serial_info(info, argp);
-	case TIOCSSERIAL:
-		lock_kernel();
-		ret = set_serial_info(info, argp);
-		unlock_kernel();
-		return ret;
-	case TIOCSERGWILD:
-		return put_user(0L, (unsigned long __user *)argp);
-	case TIOCSERGETLSR: /* Get line status register */
-		return get_lsr_info(info, argp);
-	case TIOCSERSWILD:
-		if (!capable(CAP_SYS_ADMIN))
-			return -EPERM;
-		return 0;
-	/*
-	 * 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->lock, flags);
-		cprev = info->icount;	/* note the counters on entry */
-		spin_unlock_irqrestore(&info->lock, flags);
-		while (1) {
-			/* FIXME: convert to new style wakeup */
-			interruptible_sleep_on(&info->port.delta_msr_wait);
-			/* see if a signal did it */
-			if (signal_pending(current))
-				return -ERESTARTSYS;
-			spin_lock_irqsave(&info->lock, flags);
-			cnow = info->icount;	/* atomic copy */
-			spin_unlock_irqrestore(&info->lock, flags);
-			if (cnow.rng == cprev.rng &&
-			    cnow.dsr == cprev.dsr &&
-			    cnow.dcd == cprev.dcd &&
-			    cnow.cts == cprev.cts)
-				return -EIO; /* no change => error */
-			if (((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))) {
-				return 0;
-			}
-			cprev = cnow;
-		}
-		/* NOTREACHED */
-	/*
-	 * 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.
-	 */
-	case TIOCGICOUNT:
-		spin_lock_irqsave(&info->lock, flags);
-		cnow = info->icount;
-		spin_unlock_irqrestore(&info->lock, flags);
-		p_cuser = argp;
-		if (put_user(cnow.cts, &p_cuser->cts) ||
-		    put_user(cnow.dsr, &p_cuser->dsr) ||
-		    put_user(cnow.rng, &p_cuser->rng) ||
-		    put_user(cnow.dcd, &p_cuser->dcd))
-			return -EFAULT;
-			return 0;
-	case TIOCGHAYESESP:
-		return get_esp_config(info, argp);
-	case TIOCSHAYESESP:
-		lock_kernel();
-		ret = set_esp_config(info, argp);
-		unlock_kernel();
-		return ret;
-	default:
-		return -ENOIOCTLCMD;
-	}
-	return 0;
-}
-
-static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	change_speed(info);
-
-	spin_lock_irqsave(&info->lock, flags);
-
-	/* Handle transition to B0 status */
-	if ((old_termios->c_cflag & CBAUD) &&
-		!(tty->termios->c_cflag & CBAUD)) {
-		info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
-		serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
-		serial_out(info, UART_ESI_CMD2, UART_MCR);
-		serial_out(info, UART_ESI_CMD2, info->MCR);
-	}
-
-	/* Handle transition away from B0 status */
-	if (!(old_termios->c_cflag & CBAUD) &&
-		(tty->termios->c_cflag & CBAUD)) {
-		info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
-		serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
-		serial_out(info, UART_ESI_CMD2, UART_MCR);
-		serial_out(info, UART_ESI_CMD2, info->MCR);
-	}
-
-	spin_unlock_irqrestore(&info->lock, flags);
-
-	/* Handle turning of CRTSCTS */
-	if ((old_termios->c_cflag & CRTSCTS) &&
-	    !(tty->termios->c_cflag & CRTSCTS)) {
-		rs_start(tty);
-	}
-}
-
-/*
- * ------------------------------------------------------------
- * rs_close()
- *
- * 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 rs_close(struct tty_struct *tty, struct file *filp)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long flags;
-
-	if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
-		return;
-
-	spin_lock_irqsave(&info->lock, flags);
-
-	if (tty_hung_up_p(filp)) {
-		DBG_CNT("before DEC-hung");
-		goto out;
-	}
-
-#ifdef SERIAL_DEBUG_OPEN
-	printk(KERN_DEBUG "rs_close ttys%d, count = %d\n",
-						info->line, info->port.count);
-#endif
-	if (tty->count == 1 && info->port.count != 1) {
-		/*
-		 * Uh, oh.  tty->count is 1, which means that the tty
-		 * structure will be freed.  Info->count should always
-		 * be one in these conditions.  If it's greater than
-		 * one, we've got real problems, since it means the
-		 * serial port won't be shutdown.
-		 */
-		printk(KERN_DEBUG "rs_close: bad serial port count; tty->count is 1, info->port.count is %d\n", info->port.count);
-		info->port.count = 1;
-	}
-	if (--info->port.count < 0) {
-		printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
-		       info->line, info->port.count);
-		info->port.count = 0;
-	}
-	if (info->port.count) {
-		DBG_CNT("before DEC-2");
-		goto out;
-	}
-	info->port.flags |= ASYNC_CLOSING;
-
-	spin_unlock_irqrestore(&info->lock, flags);
-	/*
-	 * Now we wait for the transmit buffer to clear; and we notify
-	 * the line discipline to only process XON/XOFF characters.
-	 */
-	tty->closing = 1;
-	if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
-		tty_wait_until_sent(tty, info->closing_wait);
-	/*
-	 * 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; */
-	info->IER &= ~UART_IER_RDI;
-	info->read_status_mask &= ~UART_LSR_DR;
-	if (info->port.flags & ASYNC_INITIALIZED) {
-
-		spin_lock_irqsave(&info->lock, flags);
-		serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
-		serial_out(info, UART_ESI_CMD2, info->IER);
-
-		/* disable receive timeout */
-		serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
-		serial_out(info, UART_ESI_CMD2, 0x00);
-
-		spin_unlock_irqrestore(&info->lock, flags);
-
-		/*
-		 * Before we drop DTR, make sure the UART transmitter
-		 * has completely drained; this is especially
-		 * important if there is a transmit FIFO!
-		 */
-		rs_wait_until_sent(tty, info->timeout);
-	}
-	shutdown(info);
-	rs_flush_buffer(tty);
-	tty_ldisc_flush(tty);
-	tty->closing = 0;
-	info->port.tty = NULL;
-
-	if (info->port.blocked_open) {
-		if (info->close_delay)
-			msleep_interruptible(jiffies_to_msecs(info->close_delay));
-		wake_up_interruptible(&info->port.open_wait);
-	}
-	info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
-	wake_up_interruptible(&info->port.close_wait);
-	return;
-
-out:
-	spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
-{
-	struct esp_struct *info = tty->driver_data;
-	unsigned long orig_jiffies, char_time;
-	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
-		return;
-
-	orig_jiffies = jiffies;
-	char_time = ((info->timeout - HZ / 50) / 1024) / 5;
-
-	if (!char_time)
-		char_time = 1;
-
-	spin_lock_irqsave(&info->lock, flags);
-	serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
-	serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
-
-	while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
-		(serial_in(info, UART_ESI_STAT2) != 0xff)) {
-
-		spin_unlock_irqrestore(&info->lock, flags);
-		msleep_interruptible(jiffies_to_msecs(char_time));
-
-		if (signal_pending(current))
-			return;
-
-		if (timeout && time_after(jiffies, orig_jiffies + timeout))
-			return;
-
-		spin_lock_irqsave(&info->lock, flags);
-		serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
-		serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
-	}
-	spin_unlock_irqrestore(&info->lock, flags);
-	set_current_state(TASK_RUNNING);
-}
-
-/*
- * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
- */
-static void esp_hangup(struct tty_struct *tty)
-{
-	struct esp_struct *info = tty->driver_data;
-
-	if (serial_paranoia_check(info, tty->name, "esp_hangup"))
-		return;
-
-	rs_flush_buffer(tty);
-	shutdown(info);
-	info->port.count = 0;
-	info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
-	info->port.tty = NULL;
-	wake_up_interruptible(&info->port.open_wait);
-}
-
-static int esp_carrier_raised(struct tty_port *port)
-{
-	struct esp_struct *info = container_of(port, struct esp_struct, port);
-	serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
-	if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
-		return 1;
-	return 0;
-}
-
-/*
- * ------------------------------------------------------------
- * esp_open() and friends
- * ------------------------------------------------------------
- */
-static int block_til_ready(struct tty_struct *tty, struct file *filp,
-			   struct esp_struct *info)
-{
-	DECLARE_WAITQUEUE(wait, current);
-	int		retval;
-	int		do_clocal = 0;
-	unsigned long	flags;
-	int		cd;
-	struct tty_port *port = &info->port;
-
-	/*
-	 * If the device is in the middle of being closed, then block
-	 * until it's done, and then try again.
-	 */
-	if (tty_hung_up_p(filp) ||
-	    (port->flags & ASYNC_CLOSING)) {
-		if (port->flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&port->close_wait);
-#ifdef SERIAL_DO_RESTART
-		if (port->flags & ASYNC_HUP_NOTIFY)
-			return -EAGAIN;
-		else
-			return -ERESTARTSYS;
-#else
-		return -EAGAIN;
-#endif
-	}
-
-	/*
-	 * If non-blocking mode is set, or the port is not enabled,
-	 * then make the check up front and then exit.
-	 */
-	if ((filp->f_flags & O_NONBLOCK) ||
-	    (tty->flags & (1 << TTY_IO_ERROR))) {
-		port->flags |= ASYNC_NORMAL_ACTIVE;
-		return 0;
-	}
-
-	if (tty->termios->c_cflag & CLOCAL)
-		do_clocal = 1;
-
-	/*
-	 * Block waiting for the carrier detect and the line to become
-	 * free (i.e., not in use by the callout).  While we are in
-	 * this loop, port->count is dropped by one, so that
-	 * rs_close() knows when to free things.  We restore it upon
-	 * exit, either normal or abnormal.
-	 */
-	retval = 0;
-	add_wait_queue(&port->open_wait, &wait);
-#ifdef SERIAL_DEBUG_OPEN
-	printk(KERN_DEBUG "block_til_ready before block: ttys%d, count = %d\n",
-	       info->line, port->count);
-#endif
-	spin_lock_irqsave(&info->lock, flags);
-	if (!tty_hung_up_p(filp))
-		port->count--;
-	port->blocked_open++;
-	while (1) {
-		if ((tty->termios->c_cflag & CBAUD)) {
-			unsigned int scratch;
-
-			serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
-			serial_out(info, UART_ESI_CMD2, UART_MCR);
-			scratch = serial_in(info, UART_ESI_STAT1);
-			serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
-			serial_out(info, UART_ESI_CMD2, UART_MCR);
-			serial_out(info, UART_ESI_CMD2,
-				scratch | UART_MCR_DTR | UART_MCR_RTS);
-		}
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (tty_hung_up_p(filp) ||
-		    !(port->flags & ASYNC_INITIALIZED)) {
-#ifdef SERIAL_DO_RESTART
-			if (port->flags & ASYNC_HUP_NOTIFY)
-				retval = -EAGAIN;
-			else
-				retval = -ERESTARTSYS;
-#else
-			retval = -EAGAIN;
-#endif
-			break;
-		}
-
-		cd = tty_port_carrier_raised(port);
-
-		if (!(port->flags & ASYNC_CLOSING) &&
-		    (do_clocal))
-			break;
-		if (signal_pending(current)) {
-			retval = -ERESTARTSYS;
-			break;
-		}
-#ifdef SERIAL_DEBUG_OPEN
-		printk(KERN_DEBUG "block_til_ready blocking: ttys%d, count = %d\n",
-		       info->line, port->count);
-#endif
-		spin_unlock_irqrestore(&info->lock, flags);
-		schedule();
-		spin_lock_irqsave(&info->lock, flags);
-	}
-	set_current_state(TASK_RUNNING);
-	remove_wait_queue(&port->open_wait, &wait);
-	if (!tty_hung_up_p(filp))
-		port->count++;
-	port->blocked_open--;
-	spin_unlock_irqrestore(&info->lock, flags);
-#ifdef SERIAL_DEBUG_OPEN
-	printk(KERN_DEBUG "block_til_ready after blocking: ttys%d, count = %d\n",
-	       info->line, port->count);
-#endif
-	if (retval)
-		return retval;
-	port->flags |= ASYNC_NORMAL_ACTIVE;
-	return 0;
-}
-
-/*
- * 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 esp_open(struct tty_struct *tty, struct file *filp)
-{
-	struct esp_struct	*info;
-	int 			retval, line;
-	unsigned long		flags;
-
-	line = tty->index;
-	if ((line < 0) || (line >= NR_PORTS))
-		return -ENODEV;
-
-	/* find the port in the chain */
-
-	info = ports;
-
-	while (info && (info->line != line))
-		info = info->next_port;
-
-	if (!info) {
-		serial_paranoia_check(info, tty->name, "esp_open");
-		return -ENODEV;
-	}
-
-#ifdef SERIAL_DEBUG_OPEN
-	printk(KERN_DEBUG "esp_open %s, count = %d\n", tty->name, info->port.count);
-#endif
-	spin_lock_irqsave(&info->lock, flags);
-	info->port.count++;
-	tty->driver_data = info;
-	info->port.tty = tty;
-
-	spin_unlock_irqrestore(&info->lock, flags);
-
-	/*
-	 * Start up serial port
-	 */
-	retval = startup(info);
-	if (retval)
-		return retval;
-
-	retval = block_til_ready(tty, filp, info);
-	if (retval) {
-#ifdef SERIAL_DEBUG_OPEN
-		printk(KERN_DEBUG "esp_open returning after block_til_ready with %d\n",
-		       retval);
-#endif
-		return retval;
-	}
-#ifdef SERIAL_DEBUG_OPEN
-	printk(KERN_DEBUG "esp_open %s successful...", tty->name);
-#endif
-	return 0;
-}
-
-/*
- * ---------------------------------------------------------------------
- * espserial_init() and friends
- *
- * espserial_init() is called at boot-time to initialize the serial driver.
- * ---------------------------------------------------------------------
- */
-
-/*
- * This routine prints out the appropriate serial driver version
- * number, and identifies which options were configured into this
- * driver.
- */
-
-static void __init show_serial_version(void)
-{
-	printk(KERN_INFO "%s version %s (DMA %u)\n",
-		serial_name, serial_version, dma);
-}
-
-/*
- * This routine is called by espserial_init() to initialize a specific serial
- * port.
- */
-static int autoconfig(struct esp_struct *info)
-{
-	int port_detected = 0;
-	unsigned long flags;
-
-	if (!request_region(info->io_port, REGION_SIZE, "esp serial"))
-		return -EIO;
-
-	spin_lock_irqsave(&info->lock, flags);
-	/*
-	 * Check for ESP card
-	 */
-
-	if (serial_in(info, UART_ESI_BASE) == 0xf3) {
-		serial_out(info, UART_ESI_CMD1, 0x00);
-		serial_out(info, UART_ESI_CMD1, 0x01);
-
-		if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
-			port_detected = 1;
-
-			if (!(info->irq)) {
-				serial_out(info, UART_ESI_CMD1, 0x02);
-
-				if (serial_in(info, UART_ESI_STAT1) & 0x01)
-					info->irq = 3;
-				else
-					info->irq = 4;
-			}
-
-
-			/* put card in enhanced mode */
-			/* this prevents access through */
-			/* the "old" IO ports */
-			esp_basic_init(info);
-
-			/* clear out MCR */
-			serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
-			serial_out(info, UART_ESI_CMD2, UART_MCR);
-			serial_out(info, UART_ESI_CMD2, 0x00);
-		}
-	}
-	if (!port_detected)
-		release_region(info->io_port, REGION_SIZE);
-
-	spin_unlock_irqrestore(&info->lock, flags);
-	return (port_detected);
-}
-
-static const struct tty_operations esp_ops = {
-	.open = esp_open,
-	.close = rs_close,
-	.write = rs_write,
-	.put_char = rs_put_char,
-	.flush_chars = rs_flush_chars,
-	.write_room = rs_write_room,
-	.chars_in_buffer = rs_chars_in_buffer,
-	.flush_buffer = rs_flush_buffer,
-	.ioctl = rs_ioctl,
-	.throttle = rs_throttle,
-	.unthrottle = rs_unthrottle,
-	.set_termios = rs_set_termios,
-	.stop = rs_stop,
-	.start = rs_start,
-	.hangup = esp_hangup,
-	.break_ctl = esp_break,
-	.wait_until_sent = rs_wait_until_sent,
-	.tiocmget = esp_tiocmget,
-	.tiocmset = esp_tiocmset,
-};
-
-static const struct tty_port_operations esp_port_ops = {
-	.esp_carrier_raised,
-};
-
-/*
- * The serial driver boot-time initialization code!
- */
-static int __init espserial_init(void)
-{
-	int i, offset;
-	struct esp_struct *info;
-	struct esp_struct *last_primary = NULL;
-	int esp[] = { 0x100, 0x140, 0x180, 0x200, 0x240, 0x280, 0x300, 0x380 };
-
-	esp_driver = alloc_tty_driver(NR_PORTS);
-	if (!esp_driver)
-		return -ENOMEM;
-
-	for (i = 0; i < NR_PRIMARY; i++) {
-		if (irq[i] != 0) {
-			if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
-			    (irq[i] == 8) || (irq[i] == 13))
-				irq[i] = 0;
-			else if (irq[i] == 2)
-				irq[i] = 9;
-		}
-	}
-
-	if ((dma != 1) && (dma != 3))
-		dma = 0;
-
-	if ((rx_trigger < 1) || (rx_trigger > 1023))
-		rx_trigger = 768;
-
-	if ((tx_trigger < 1) || (tx_trigger > 1023))
-		tx_trigger = 768;
-
-	if ((flow_off < 1) || (flow_off > 1023))
-		flow_off = 1016;
-
-	if ((flow_on < 1) || (flow_on > 1023))
-		flow_on = 944;
-
-	if ((rx_timeout < 0) || (rx_timeout > 255))
-		rx_timeout = 128;
-
-	if (flow_on >= flow_off)
-		flow_on = flow_off - 1;
-
-	show_serial_version();
-
-	/* Initialize the tty_driver structure */
-
-	esp_driver->owner = THIS_MODULE;
-	esp_driver->name = "ttyP";
-	esp_driver->major = ESP_IN_MAJOR;
-	esp_driver->minor_start = 0;
-	esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
-	esp_driver->subtype = SERIAL_TYPE_NORMAL;
-	esp_driver->init_termios = tty_std_termios;
-	esp_driver->init_termios.c_cflag =
-		B9600 | CS8 | CREAD | HUPCL | CLOCAL;
-	esp_driver->init_termios.c_ispeed = 9600;
-	esp_driver->init_termios.c_ospeed = 9600;
-	esp_driver->flags = TTY_DRIVER_REAL_RAW;
-	tty_set_operations(esp_driver, &esp_ops);
-	if (tty_register_driver(esp_driver)) {
-		printk(KERN_ERR "Couldn't register esp serial driver");
-		put_tty_driver(esp_driver);
-		return 1;
-	}
-
-	info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
-
-	if (!info) {
-		printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
-		tty_unregister_driver(esp_driver);
-		put_tty_driver(esp_driver);
-		return 1;
-	}
-
-	spin_lock_init(&info->lock);
-	/* rx_trigger, tx_trigger are needed by autoconfig */
-	info->config.rx_trigger = rx_trigger;
-	info->config.tx_trigger = tx_trigger;
-
-	i = 0;
-	offset = 0;
-
-	do {
-		tty_port_init(&info->port);
-		info->port.ops = &esp_port_ops;
-		info->io_port = esp[i] + offset;
-		info->irq = irq[i];
-		info->line = (i * 8) + (offset / 8);
-
-		if (!autoconfig(info)) {
-			i++;
-			offset = 0;
-			continue;
-		}
-
-		info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
-		info->port.flags = STD_COM_FLAGS;
-		if (info->custom_divisor)
-			info->port.flags |= ASYNC_SPD_CUST;
-		info->magic = ESP_MAGIC;
-		info->close_delay = 5*HZ/10;
-		info->closing_wait = 30*HZ;
-		info->config.rx_timeout = rx_timeout;
-		info->config.flow_on = flow_on;
-		info->config.flow_off = flow_off;
-		info->config.pio_threshold = pio_threshold;
-		info->next_port = ports;
-		init_waitqueue_head(&info->break_wait);
-		ports = info;
-		printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
-			info->line, info->io_port, info->irq);
-
-		if (info->line % 8) {
-			printk("secondary port\n");
-			/* 8 port cards can't do DMA */
-			info->stat_flags |= ESP_STAT_NEVER_DMA;
-
-			if (last_primary)
-				last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
-		} else {
-			printk("primary port\n");
-			last_primary = info;
-			irq[i] = info->irq;
-		}
-
-		if (!dma)
-			info->stat_flags |= ESP_STAT_NEVER_DMA;
-
-		info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
-		if (!info) {
-			printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
-			/* allow use of the already detected ports */
-			return 0;
-		}
-
-		spin_lock_init(&info->lock);
-		/* rx_trigger, tx_trigger are needed by autoconfig */
-		info->config.rx_trigger = rx_trigger;
-		info->config.tx_trigger = tx_trigger;
-
-		if (offset == 56) {
-			i++;
-			offset = 0;
-		} else {
-			offset += 8;
-		}
-	} while (i < NR_PRIMARY);
-
-	/* free the last port memory allocation */
-	kfree(info);
-
-	return 0;
-}
-
-static void __exit espserial_exit(void)
-{
-	int e1;
-	struct esp_struct *temp_async;
-	struct esp_pio_buffer *pio_buf;
-
-	e1 = tty_unregister_driver(esp_driver);
-	if (e1)
-		printk(KERN_ERR "esp: failed to unregister driver (%d)\n", e1);
-	put_tty_driver(esp_driver);
-
-	while (ports) {
-		if (ports->io_port)
-			release_region(ports->io_port, REGION_SIZE);
-		temp_async = ports->next_port;
-		kfree(ports);
-		ports = temp_async;
-	}
-
-	if (dma_buffer)
-		free_pages((unsigned long)dma_buffer,
-			get_order(DMA_BUFFER_SZ));
-
-	while (free_pio_buf) {
-		pio_buf = free_pio_buf->next;
-		kfree(free_pio_buf);
-		free_pio_buf = pio_buf;
-	}
-}
-
-module_init(espserial_init);
-module_exit(espserial_exit);