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>

6 files changed, 0 insertions, 2816 deletions

diff --git a/Documentation/serial/hayes-esp.txt b/Documentation/serial/hayes-esp.txt
deleted file mode 100644
index 09b5d585675..00000000000
--- a/Documentation/serial/hayes-esp.txt
+++ /dev/null
@@ -1,154 +0,0 @@
-HAYES ESP DRIVER VERSION 2.1
-
-A big thanks to the people at Hayes, especially Alan Adamson.  Their support
-has enabled me to provide enhancements to the driver.
-
-Please report your experiences with this driver to me (arobinso@nyx.net).  I
-am looking for both positive and negative feedback.
-
-*** IMPORTANT CHANGES FOR 2.1 ***
-Support for PIO mode.  Five situations will cause PIO mode to be used:
-1) A multiport card is detected.  PIO mode will always be used.  (8 port cards
-do not support DMA).
-2) The DMA channel is set to an invalid value (anything other than 1 or 3).
-3) The DMA buffer/channel could not be allocated.  The port will revert to PIO
-mode until it is reopened.
-4) Less than a specified number of bytes need to be transferred to/from the
-FIFOs.  PIO mode will be used for that transfer only.
-5) A port needs to do a DMA transfer and another port is already using the
-DMA channel.  PIO mode will be used for that transfer only.
-
-Since the Hayes ESP seems to conflict with other cards (notably sound cards)
-when using DMA, DMA is turned off by default.  To use DMA, it must be turned
-on explicitly, either with the "dma=" option described below or with
-setserial.  A multiport card can be forced into DMA mode by using setserial;
-however, most multiport cards don't support DMA.
-
-The latest version of setserial allows the enhanced configuration of the ESP
-card to be viewed and modified.
-***
-
-This package contains the files needed to compile a module to support the Hayes
-ESP card.  The drivers are basically a modified version of the serial drivers.
-
-Features:
-
-- Uses the enhanced mode of the ESP card, allowing a wider range of
-  interrupts and features than compatibility mode
-- Uses DMA and 16 bit PIO mode to transfer data to and from the ESP's FIFOs,
-  reducing CPU load
-- Supports primary and secondary ports
-
-
-If the driver is compiled as a module, the IRQs to use can be specified by
-using the irq= option.  The format is:
-
-irq=[0x100],[0x140],[0x180],[0x200],[0x240],[0x280],[0x300],[0x380]
-
-The address in brackets is the base address of the card.  The IRQ of
-nonexistent cards can be set to 0.  If an IRQ of a card that does exist is set
-to 0, the driver will attempt to guess at the correct IRQ.  For example, to set
-the IRQ of the card at address 0x300 to 12, the insmod command would be:
-
-insmod esp irq=0,0,0,0,0,0,12,0
-
-The custom divisor can be set by using the divisor= option.  The format is the
-same as for the irq= option.  Each divisor value is a series of hex digits,
-with each digit representing the divisor to use for a corresponding port.  The
-divisor value is constructed RIGHT TO LEFT.  Specifying a nonzero divisor value
-will automatically set the spd_cust flag.  To calculate the divisor to use for
-a certain baud rate, divide the port's base baud (generally 921600) by the
-desired rate.  For example, to set the divisor of the primary port at 0x300 to
-4 and the divisor of the secondary port at 0x308 to 8, the insmod command would
-be:
-
-insmod esp divisor=0,0,0,0,0,0,0x84,0
-
-The dma= option can be used to set the DMA channel.  The channel can be either
-1 or 3.  Specifying any other value will force the driver to use PIO mode.
-For example, to set the DMA channel to 3, the insmod command would be:
-
-insmod esp dma=3
-
-The rx_trigger= and tx_trigger= options can be used to set the FIFO trigger
-levels.  They specify when the ESP card should send an interrupt.  Larger
-values will decrease the number of interrupts; however, a value too high may
-result in data loss.  Valid values are 1 through 1023, with 768 being the
-default.  For example, to set the receive trigger level to 512 bytes and the
-transmit trigger level to 700 bytes, the insmod command would be:
-
-insmod esp rx_trigger=512 tx_trigger=700
-
-The flow_off= and flow_on= options can be used to set the hardware flow off/
-flow on levels.  The flow on level must be lower than the flow off level, and
-the flow off level should be higher than rx_trigger.  Valid values are 1
-through 1023, with 1016 being the default flow off level and 944 being the
-default flow on level.  For example, to set the flow off level to 1000 bytes
-and the flow on level to 935 bytes, the insmod command would be:
-
-insmod esp flow_off=1000 flow_on=935
-
-The rx_timeout= option can be used to set the receive timeout value.  This
-value indicates how long after receiving the last character that the ESP card
-should wait before signalling an interrupt.  Valid values are 0 though 255,
-with 128 being the default.  A value too high will increase latency, and a
-value too low will cause unnecessary interrupts.  For example, to set the
-receive timeout to 255, the insmod command would be:
-
-insmod esp rx_timeout=255
-
-The pio_threshold= option sets the threshold (in number of characters) for
-using PIO mode instead of DMA mode.  For example, if this value is 32,
-transfers of 32 bytes or less will always use PIO mode.
-
-insmod esp pio_threshold=32
-
-Multiple options can be listed on the insmod command line by separating each
-option with a space.  For example:
-
-insmod esp dma=3 trigger=512
-
-The esp module can be automatically loaded when needed.  To cause this to
-happen, add the following lines to /etc/modprobe.conf (replacing the last line
-with options for your configuration):
-
-alias char-major-57 esp
-alias char-major-58 esp
-options esp irq=0,0,0,0,0,0,3,0 divisor=0,0,0,0,0,0,0x4,0
-
-You may also need to run 'depmod -a'.
-
-Devices must be created manually.  To create the devices, note the output from
-the module after it is inserted.  The output will appear in the location where
-kernel messages usually appear (usually /var/adm/messages).  Create two devices
-for each 'tty' mentioned, one with major of 57 and the other with major of 58.
-The minor number should be the same as the tty number reported.  The commands
-would be (replace ? with the tty number):
-
-mknod /dev/ttyP? c 57 ?
-mknod /dev/cup? c 58 ?
-
-For example, if the following line appears:
-
-Oct 24 18:17:23 techno kernel: ttyP8 at 0x0140 (irq = 3) is an ESP primary port
-
-...two devices should be created:
-
-mknod /dev/ttyP8 c 57 8
-mknod /dev/cup8 c 58 8
-
-You may need to set the permissions on the devices:
-
-chmod 666 /dev/ttyP*
-chmod 666 /dev/cup*
-
-The ESP module and the serial module should not conflict (they can be used at
-the same time).  After the ESP module has been loaded the ports on the ESP card
-will no longer be accessible by the serial driver.
-
-If I/O errors are experienced when accessing the port, check for IRQ and DMA
-conflicts ('cat /proc/interrupts' and 'cat /proc/dma' for a list of IRQs and
-DMAs currently in use).
-
-Enjoy!
-Andrew J. Robinson <arobinso@nyx.net>
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 6aad99ec4e0..6f31c947210 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 19a79dd79ee..f957edf7e45 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 b19d43cd954..00000000000
--- 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;<