Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2630 insertions, 0 deletions

diff --git a/drivers/char/esp.c b/drivers/char/esp.c
new file mode 100644
index 000000000000..9f53d2fcc360
--- /dev/null
+++ b/drivers/char/esp.c
@@ -0,0 +1,2630 @@
+/*
+ *  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 Anh�pl 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 <asm/system.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+
+#include <asm/dma.h>
+#include <linux/slab.h>
+#include <asm/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 subtype definitions */
+#define SERIAL_TYPE_NORMAL	1
+
+/*
+ * 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("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
+ tty->name, (info->flags), serial_driver.refcount,info->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)
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write.  We need to
+ * lock it in case the memcpy_fromfs blocks while swapping in a page,
+ * and some other program tries to do a serial write at the same time.
+ * Since the lock will only come under contention when the system is
+ * swapping and available memory is low, it makes sense to share one
+ * buffer across all the serial ports, since it significantly saves
+ * memory if large numbers of serial ports are open.
+ */
+static unsigned char *tmp_buf;
+static DECLARE_MUTEX(tmp_buf_sem);
+
+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->port + offset);
+}
+
+static inline void serial_out(struct esp_struct *info, int offset,
+			      unsigned char value)
+{
+	outb(value, info->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 = (struct esp_struct *)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 = (struct esp_struct *)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
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static inline void rs_sched_event(struct esp_struct *info,
+				  int event)
+{
+	info->event |= 1 << event;
+	schedule_work(&info->tqueue);
+}
+
+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->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->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->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)) {
+			*(tty->flip.char_buf_ptr++) = pio_buf->data[i];
+
+			if (err_buf->data[i] & 0x04) {
+				*(tty->flip.flag_buf_ptr++) = TTY_BREAK;
+
+				if (info->flags & ASYNC_SAK)
+					do_SAK(tty);
+			}
+			else if (err_buf->data[i] & 0x02)
+				*(tty->flip.flag_buf_ptr++) = TTY_FRAME;
+			else if (err_buf->data[i] & 0x01)
+				*(tty->flip.flag_buf_ptr++) = TTY_PARITY;
+			else
+				*(tty->flip.flag_buf_ptr++) = 0;
+		
+			tty->flip.count++;
+		}
+	}
+
+	schedule_delayed_work(&tty->flip.work, 1);
+
+	info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
+	release_pio_buffer(pio_buf);
+	release_pio_buffer(err_buf);
+}
+
+static inline void receive_chars_dma(struct esp_struct *info, int num_bytes)
+{
+	unsigned long flags;
+	info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
+	dma_bytes = num_bytes;
+	info->stat_flags |= ESP_STAT_DMA_RX;
+	
+	flags=claim_dma_lock();
+        disable_dma(dma);
+        clear_dma_ff(dma);
+        set_dma_mode(dma, DMA_MODE_READ);
+        set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
+        set_dma_count(dma, dma_bytes);
+        enable_dma(dma);
+        release_dma_lock(flags);
+        
+        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->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;
+
+	memcpy(tty->flip.char_buf_ptr, dma_buffer, num_bytes);
+	tty->flip.char_buf_ptr += num_bytes;
+	tty->flip.count += num_bytes;
+	memset(tty->flip.flag_buf_ptr, 0, num_bytes);
+	tty->flip.flag_buf_ptr += num_bytes;
+
+	if (num_bytes > 0) {
+		tty->flip.flag_buf_ptr--;
+
+		status &= (0x1c & info->read_status_mask);
+
+		if (status & info->ignore_status_mask) {
+			tty->flip.count--;
+			tty->flip.char_buf_ptr--;
+			tty->flip.flag_buf_ptr--;
+		} else if (status & 0x10) {
+			*tty->flip.flag_buf_ptr = TTY_BREAK;
+			(info->icount.brk)++;
+			if (info->flags & ASYNC_SAK)
+				do_SAK(tty);
+		} else if (status & 0x08) {
+			*tty->flip.flag_buf_ptr = TTY_FRAME;
+			(info->icount.frame)++;
+		}
+		else if (status & 0x04) {
+			*tty->flip.flag_buf_ptr = TTY_PARITY;
+			(info->icount.parity)++;
+		}
+
+		tty->flip.flag_buf_ptr++;
+		
+		schedule_delayed_work(&tty->flip.work, 1);
+	}
+
+	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->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) {
+		rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
+
+#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)
+{
+	unsigned long flags;
+	
+	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) {
+		rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
+
+#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;
+	
+	flags=claim_dma_lock();
+        disable_dma(dma);
+        clear_dma_ff(dma);
+        set_dma_mode(dma, DMA_MODE_WRITE);
+        set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
+        set_dma_count(dma, dma_bytes);
+        enable_dma(dma);
+        release_dma_lock(flags);
+        
+        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);
+		
+		flags=claim_dma_lock();
+        	disable_dma(dma);
+        	clear_dma_ff(dma);
+        	set_dma_mode(dma, DMA_MODE_WRITE);
+        	set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
+        	set_dma_count(dma, dma_bytes);
+        	enable_dma(dma);
+        	release_dma_lock(flags);
+        	
+        	serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
+	} else {
+		dma_bytes = 0;
+		info->stat_flags &= ~ESP_STAT_DMA_TX;
+	}
+}
+
+static inline 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->delta_msr_wait);
+	}
+
+	if ((info->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->open_wait);
+		else {
+#ifdef SERIAL_DEBUG_OPEN
+			printk("scheduling hangup...");
+#endif
+			schedule_work(&info->tqueue_hangup);
+		}
+	}
+}
+
+/*
+ * This is the serial driver's interrupt routine
+ */
+static irqreturn_t rs_interrupt_single(int irq, void *dev_id,
+					struct pt_regs *regs)
+{
+	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->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);
+
+		if (num_bytes > (TTY_FLIPBUF_SIZE - info->tty->flip.count))
+		  num_bytes = TTY_FLIPBUF_SIZE - info->tty->flip.count;
+
+		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->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.
+ * -------------------------------------------------------------------
+ */
+
+static void do_softint(void *private_)
+{
+	struct esp_struct	*info = (struct esp_struct *) private_;
+	struct tty_struct	*tty;
+	
+	tty = info->tty;
+	if (!tty)
+		return;
+
+	if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
+		tty_wakeup(tty);
+	}
+}
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred.  The path of
+ * hangup processing is:
+ *
+ * 	serial interrupt routine -> (scheduler tqueue) ->
+ * 	do_serial_hangup() -> tty->hangup() -> esp_hangup()
+ * 
+ */
+static void do_serial_hangup(void *private_)
+{
+	struct esp_struct	*info = (struct esp_struct *) private_;
+	struct tty_struct	*tty;
+	
+	tty = info->tty;
+	if (tty)
+		tty_hangup(tty);
+}
+
+/*
+ * ---------------------------------------------------------------
+ * 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 inline 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->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("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->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, SA_SHIRQ,
+			     "esp serial", info);
+
+	if (retval) {
+		if (capable(CAP_SYS_ADMIN)) {
+			if (info->tty)
+				set_bit(TTY_IO_ERROR,
+					&info->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->tty)
+		clear_bit(TTY_IO_ERROR, &info->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->tty) {
+		if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+			info->tty->alt_speed = 57600;
+		if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+			info->tty->alt_speed = 115200;
+		if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+			info->tty->alt_speed = 230400;
+		if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+			info->tty->alt_speed = 460800;
+	}
+	
+	/*
+	 * set the speed of the serial port
+	 */
+	change_speed(info);
+	info->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->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->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->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->tty || (info->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->tty)
+		set_bit(TTY_IO_ERROR, &info->tty->flags);
+	
+	info->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->tty || !info->tty->termios)
+		return;
+	cflag = info->tty->termios->c_cflag;
+	port = info->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->tty);
+	if (baud == 38400 &&
+	    ((info->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;
+	
+	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->flags |= ASYNC_CTS_FLOW;
+		/* info->IER |= UART_IER_MSI; */
+		flow1 = 0x04;
+		flow2 = 0x10;
+	} else
+		info->flags &= ~ASYNC_CTS_FLOW;
+	if (cflag & CLOCAL)
+		info->flags &= ~ASYNC_CHECK_CD;
+	else {
+		info->flags |= ASYNC_CHECK_CD;
+		/* info->IER |= UART_IER_MSI; */
+	}
+
+	/*
+	 * Set up parity check flag
+	 */
+#d