First round of commits for support for DECstations and Bagets.

1 files changed, 2941 insertions, 0 deletions

diff --git a/arch/mips/baget/vacserial.c b/arch/mips/baget/vacserial.c
new file mode 100644
index 000000000..6e3add687
--- /dev/null
+++ b/arch/mips/baget/vacserial.c
@@ -0,0 +1,2941 @@
+/* $Id$
+ * vacserial.c: VAC UART serial driver
+ *              This code stealed and adopted from linux/drivers/char/serial.c
+ *              See that for author info
+ *
+ * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
+ */
+
+#undef  SERIAL_PARANOIA_CHECK
+#define CONFIG_SERIAL_NOPAUSE_IO
+#define SERIAL_DO_RESTART
+
+#define CONFIG_SERIAL_SHARE_IRQ
+
+/* Set of debugging defines */
+
+#undef  SERIAL_DEBUG_INTR
+#undef  SERIAL_DEBUG_OPEN
+#undef  SERIAL_DEBUG_FLOW
+#undef  SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+
+#define RS_STROBE_TIME (10*HZ)
+#define RS_ISR_PASS_LIMIT  2 /* Beget is not a super-computer (old=256) */
+
+#define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
+
+#define SERIAL_INLINE
+  
+#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
+#define DBG_CNT(s) baget_printk("(%s):[%x] refc=%d, serc=%d, ttyc=%d-> %s\n", \
+  kdevname(tty->device),(info->flags),serial_refcount,info->count,tty->count,s)
+#else
+#define DBG_CNT(s)
+#endif
+
+#define  QUAD_UART_SPEED  /* Useful for Baget */
+
+/*
+ * End of serial driver configuration section.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/malloc.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#ifdef CONFIG_SERIAL_CONSOLE
+#include <linux/console.h>
+#endif
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/bitops.h>
+#include <asm/serial.h>
+#include <asm/baget/baget.h>
+
+#define BAGET_VAC_UART_IRQ 0x35
+
+/*
+ *  Implementation note:
+ *  It was descovered by means of advanced electronic tools,
+ *  if the driver works via TX_READY interrupts then VIC generates
+ *  strange self-eliminating traps. Thus, the driver is rewritten to work
+ *  via TX_EMPTY
+ */
+
+/* VAC-specific check/debug switches */
+
+#undef CHECK_REG_INDEX
+#undef DEBUG_IO_PORT_A
+
+#ifdef SERIAL_INLINE
+#define _INLINE_ inline
+#endif
+	
+static char *serial_name = "VAC Serial driver";
+static char *serial_version = "4.26";
+
+static DECLARE_TASK_QUEUE(tq_serial);
+
+static struct tty_driver serial_driver, callout_driver;
+static int serial_refcount;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+ 
+/*
+ * IRQ_timeout		- How long the timeout should be for each IRQ
+ * 				should be after the IRQ has been active.
+ */
+
+static struct async_struct *IRQ_ports[NR_IRQS];
+static int IRQ_timeout[NR_IRQS];
+#ifdef CONFIG_SERIAL_CONSOLE
+static struct console sercons;
+#endif
+
+static void autoconfig(struct serial_state * info);
+static void change_speed(struct async_struct *info);
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
+
+/*
+ * Here we define the default xmit fifo size used for each type of
+ * UART
+ */
+static struct serial_uart_config uart_config[] = {
+        { "unknown",  1, 0 },  /* Must go first  --  used as unasigned */
+        { "VAC UART", 1, 0 }
+}; 
+#define VAC_UART_TYPE 1   /* Just index in above array */
+
+static struct serial_state rs_table[] = {
+/*
+ * VAC has tricky layout for pair of his SIO registers,
+ *  so we need special function to access ones.
+ *  To identify port we use their TX offset
+ */
+        { 0, 9600, VAC_UART_B_TX, BAGET_VAC_UART_IRQ, 
+          STD_COM_FLAGS }, /* VAC UART B */
+        { 0, 9600, VAC_UART_A_TX, BAGET_VAC_UART_IRQ, 
+          STD_COM_FLAGS }  /* VAC UART A */
+};
+
+#define NR_PORTS	(sizeof(rs_table)/sizeof(struct serial_state))
+
+static struct tty_struct *serial_table[NR_PORTS];
+static struct termios *serial_termios[NR_PORTS];
+static struct termios *serial_termios_locked[NR_PORTS];
+
+#ifndef MIN
+#define MIN(a,b)	((a) < (b) ? (a) : (b))
+#endif
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write.  We need to
+ * lock it in case the copy_from_user 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 struct semaphore tmp_buf_sem = MUTEX;
+
+static inline int serial_paranoia_check(struct async_struct *info,
+					kdev_t device, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+	static const char *badmagic =
+		"Warning: bad magic number for serial struct (%s) in %s\n";
+	static const char *badinfo =
+		"Warning: null async_struct for (%s) in %s\n";
+
+	if (!info) {
+		printk(badinfo, kdevname(device), routine);
+		return 1;
+	}
+	if (info->magic != SERIAL_MAGIC) {
+		printk(badmagic, kdevname(device), routine);
+		return 1;
+	}
+#endif
+	return 0;
+}
+
+/*
+  To unify UART A/B access we will use following function 
+  to compute register offsets by register index.
+ */
+
+#define VAC_UART_MODE       0
+#define VAC_UART_TX         1
+#define VAC_UART_RX         2
+#define VAC_UART_INT_MASK   3
+#define VAC_UART_INT_STATUS 4
+
+#define VAC_UART_REG_NR     5
+
+static inline int uart_offset_map(unsigned long port, int reg_index) 
+{
+	static const unsigned int ind_to_reg[VAC_UART_REG_NR][NR_PORTS] = {
+		{ VAC_UART_B_MODE,       VAC_UART_A_MODE       },
+		{ VAC_UART_B_TX,         VAC_UART_A_TX         },
+		{ VAC_UART_B_RX,         VAC_UART_A_RX         },
+		{ VAC_UART_B_INT_MASK,   VAC_UART_A_INT_MASK   },
+		{ VAC_UART_B_INT_STATUS, VAC_UART_A_INT_STATUS }
+	};
+#ifdef CHECK_REG_INDEX
+	if (reg_index > VAC_UART_REG_NR) panic("vacserial: bad reg_index");
+#endif
+        return ind_to_reg[reg_index][port == VAC_UART_B_TX ? 0 : 1];
+}
+
+static inline unsigned int serial_inw(struct async_struct *info, int offset)
+{
+	int val = vac_inw(uart_offset_map(info->port,offset));
+#ifdef DEBUG_IO_PORT_A
+	if (info->port == VAC_UART_A_TX)
+		printk("UART_A_IN: reg = 0x%04x, val = 0x%04x\n", 
+		       uart_offset_map(info->port,offset), val);
+#endif
+	return val;
+}
+
+static inline unsigned int serial_inp(struct async_struct *info, int offset)
+{
+	return serial_inw(info, offset);
+}
+
+static inline unsigned int serial_in(struct async_struct *info, int offset)
+{
+	return serial_inw(info, offset);
+}
+
+static inline void serial_outw(struct async_struct *info,int offset, int value)
+{
+#ifdef DEBUG_IO_PORT_A
+	if (info->port == VAC_UART_A_TX)
+		printk("UART_A_OUT: offset = 0x%04x, val = 0x%04x\n", 
+		       uart_offset_map(info->port,offset), value);
+#endif
+	vac_outw(value, uart_offset_map(info->port,offset));
+}
+
+static inline void serial_outp(struct async_struct *info,int offset, int value)
+{
+	serial_outw(info,offset,value);
+}
+
+static inline void serial_out(struct async_struct *info,int offset, int value)
+{
+	serial_outw(info,offset,value);
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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 async_struct *info = (struct async_struct *)tty->driver_data;
+	unsigned long flags;
+
+	if (serial_paranoia_check(info, tty->device, "rs_stop"))
+		return;
+	
+	save_flags(flags); cli();
+        if (info->IER & VAC_UART_INT_TX_EMPTY) {
+                info->IER &= ~VAC_UART_INT_TX_EMPTY;
+		serial_out(info, VAC_UART_INT_MASK, info->IER);
+	}
+	restore_flags(flags);
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	unsigned long flags;
+	
+	if (serial_paranoia_check(info, tty->device, "rs_start"))
+		return;
+	
+	save_flags(flags); cli();
+	if (info->xmit_cnt && info->xmit_buf 
+            && !(info->IER & VAC_UART_INT_TX_EMPTY)) {
+                info->IER |= VAC_UART_INT_TX_EMPTY;
+		serial_out(info, VAC_UART_INT_MASK, info->IER);
+	}
+	restore_flags(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 async_struct *info,
+				  int event)
+{
+	info->event |= 1 << event;
+	queue_task(&info->tqueue, &tq_serial);
+	mark_bh(SERIAL_BH);
+}
+
+static _INLINE_ void receive_chars(struct async_struct *info,
+				   int *status)
+{
+	struct tty_struct *tty = info->tty;
+	unsigned short rx;
+	unsigned char ch;
+	int ignored = 0;
+	struct	async_icount *icount;
+
+	icount = &info->state->icount;
+	do {
+		rx = serial_inw(info, VAC_UART_RX);
+		ch = VAC_UART_RX_DATA_MASK & rx;
+
+		if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+			break;
+		*tty->flip.char_buf_ptr = ch;
+		icount->rx++;
+		
+#ifdef SERIAL_DEBUG_INTR
+		baget_printk("DR%02x:%02x...", rx, *status);
+#endif
+		*tty->flip.flag_buf_ptr = 0;
+		if (*status & (VAC_UART_STATUS_RX_BREAK_CHANGE 
+			       | VAC_UART_STATUS_RX_ERR_PARITY 
+			       | VAC_UART_STATUS_RX_ERR_FRAME 
+			       | VAC_UART_STATUS_RX_ERR_OVERRUN)) {
+			/*
+			 * For statistics only
+			 */
+			if (*status & VAC_UART_STATUS_RX_BREAK_CHANGE) {
+				*status &= ~(VAC_UART_STATUS_RX_ERR_FRAME 
+					     | VAC_UART_STATUS_RX_ERR_PARITY);
+				icount->brk++;
+			} else if (*status & VAC_UART_STATUS_RX_ERR_PARITY)
+				icount->parity++;
+			else if (*status & VAC_UART_STATUS_RX_ERR_FRAME)
+				icount->frame++;
+			if (*status & VAC_UART_STATUS_RX_ERR_OVERRUN)
+				icount->overrun++;
+
+			/*
+			 * Now check to see if character should be
+			 * ignored, and mask off conditions which
+			 * should be ignored.
+			 */
+			if (*status & info->ignore_status_mask) {
+				if (++ignored > 100)
+					break;
+				goto ignore_char;
+			}
+			*status &= info->read_status_mask;
+		
+			if (*status & (VAC_UART_STATUS_RX_BREAK_CHANGE)) {
+#ifdef SERIAL_DEBUG_INTR
+				baget_printk("handling break....");
+#endif
+				*tty->flip.flag_buf_ptr = TTY_BREAK;
+				if (info->flags & ASYNC_SAK)
+					do_SAK(tty);
+			} else if (*status & VAC_UART_STATUS_RX_ERR_PARITY)
+				*tty->flip.flag_buf_ptr = TTY_PARITY;
+			else if (*status & VAC_UART_STATUS_RX_ERR_FRAME)
+				*tty->flip.flag_buf_ptr = TTY_FRAME;
+			if (*status & VAC_UART_STATUS_RX_ERR_OVERRUN) {
+				/*
+				 * Overrun is special, since it's
+				 * reported immediately, and doesn't
+				 * affect the current character
+				 */
+				if (tty->flip.count < TTY_FLIPBUF_SIZE) {
+					tty->flip.count++;
+					tty->flip.flag_buf_ptr++;
+					tty->flip.char_buf_ptr++;
+					*tty->flip.flag_buf_ptr = TTY_OVERRUN;
+				}
+			}
+		}
+		tty->flip.flag_buf_ptr++;
+		tty->flip.char_buf_ptr++;
+		tty->flip.count++;
+	ignore_char:
+		*status = serial_inw(info, VAC_UART_INT_STATUS);
+	} while ((*status & VAC_UART_STATUS_RX_READY));
+	tty_flip_buffer_push(tty);
+}
+
+static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
+{
+	int count;
+	
+	if (info->x_char) {
+		serial_outw(info, VAC_UART_TX, 
+			    (((unsigned short)info->x_char)<<8));
+		info->state->icount.tx++;
+		info->x_char = 0;
+		if (intr_done)
+			*intr_done = 0;
+		return;
+	}
+	if ((info->xmit_cnt <= 0) || info->tty->stopped ||
+	    info->tty->hw_stopped) {
+                info->IER &= ~VAC_UART_INT_TX_EMPTY;
+		serial_outw(info, VAC_UART_INT_MASK, info->IER);
+		return;
+	}
+	count = info->xmit_fifo_size;
+	do {
+		serial_out(info, VAC_UART_TX, 
+			   (unsigned short)info->xmit_buf[info->xmit_tail++] \
+			   << 8);
+		info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+		info->state->icount.tx++;
+		if (--info->xmit_cnt <= 0)
+			break;
+	} while (--count > 0);
+	
+	if (info->xmit_cnt < WAKEUP_CHARS)
+		rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+
+#ifdef SERIAL_DEBUG_INTR
+	baget_printk("THRE...");
+#endif
+	if (intr_done)
+		*intr_done = 0;
+
+	if (info->xmit_cnt <= 0) {
+                info->IER &= ~VAC_UART_INT_TX_EMPTY;
+		serial_outw(info, VAC_UART_INT_MASK, info->IER);
+	}
+}
+
+static _INLINE_ void check_modem_status(struct async_struct *info)
+{
+#if 0 /* VAC hasn't modem control */
+	wake_up_interruptible(&info->open_wait);
+	rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); 
+#endif
+}
+
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+
+
+/*
+ *  Specific functions needed for VAC UART interrupt enter/leave
+ */
+
+#define VAC_INT_CTRL_UART_ENABLE  \
+   (VAC_INT_CTRL_TIMER_PIO10|VAC_INT_CTRL_UART_B_PIO7|VAC_INT_CTRL_UART_A_PIO7)
+
+#define VAC_INT_CTRL_UART_DISABLE(info) \
+   (VAC_INT_CTRL_TIMER_PIO10 | \
+    ((info->port == VAC_UART_A_TX) ? \
+     (VAC_INT_CTRL_UART_A_DISABLE|VAC_INT_CTRL_UART_B_PIO7) : \
+     (VAC_INT_CTRL_UART_A_PIO7|VAC_INT_CTRL_UART_B_DISABLE)))
+
+/*
+ *  Following two functions were proposed by Pavel Osipenko 
+ *  to make VAC/VIC behaviour more regular.
+ */
+static void intr_begin(struct async_struct* info) 
+{
+	serial_outw(info, VAC_UART_INT_MASK, 0);
+}
+
+static void intr_end(struct async_struct* info)
+{
+	vac_outw(VAC_INT_CTRL_UART_DISABLE(info), VAC_INT_CTRL);
+	vac_outw(VAC_INT_CTRL_UART_ENABLE,        VAC_INT_CTRL); 
+
+	serial_outw(info, VAC_UART_INT_MASK, info->IER);
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+static void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+	int status;
+	struct async_struct * info;
+	int pass_counter = 0;
+	struct async_struct *end_mark = 0;
+
+#ifdef SERIAL_DEBUG_INTR
+	baget_printk("rs_interrupt(%d)...", irq);
+#endif
+
+	info = IRQ_ports[irq];
+	if (!info)
+		return;
+
+	do {
+	        intr_begin(info);  /* Mark we begin port handling */
+
+		if (!info->tty ||
+		     (serial_inw (info, VAC_UART_INT_STATUS) 
+		      & VAC_UART_STATUS_INTS) == 0) 
+		    {
+			if (!end_mark)
+				end_mark = info;
+			goto next;
+		    }
+		end_mark = 0;
+
+		info->last_active = jiffies;
+
+		status = serial_inw(info, VAC_UART_INT_STATUS);
+#ifdef SERIAL_DEBUG_INTR
+		baget_printk("status = %x...", status);
+#endif
+		if (status & VAC_UART_STATUS_RX_READY) {
+			receive_chars(info, &status);
+		}
+		check_modem_status(info);
+                if (status & VAC_UART_STATUS_TX_EMPTY)
+			transmit_chars(info, 0);
+
+	next:
+		intr_end(info);   /* Mark this port handled */
+
+		info = info->next_port;
+		if (!info) {
+			info = IRQ_ports[irq];
+			if (pass_counter++ > RS_ISR_PASS_LIMIT) {
+				break; 	/* Prevent infinite loops */
+			}
+			continue;
+		}
+	} while (end_mark != info);
+#ifdef SERIAL_DEBUG_INTR
+	baget_printk("end.\n");
+#endif
+
+
+}
+#endif /* #ifdef CONFIG_SERIAL_SHARE_IRQ */
+
+
+/* The original driver was simplified here: 
+   two functions were joined to reduce code */
+
+#define rs_interrupt_single rs_interrupt
+
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+static void do_serial_bh(void)
+{
+	run_task_queue(&tq_serial);
+}
+
+static void do_softint(void *private_)
+{
+	struct async_struct	*info = (struct async_struct *) private_;
+	struct tty_struct	*tty;
+	
+	tty = info->tty;
+	if (!tty)
+		return;
+
+	if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
+		if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+		    tty->ldisc.write_wakeup)
+			(tty->ldisc.write_wakeup)(tty);
+		wake_up_interruptible(&tty->write_wait);
+	}
+}
+
+/*
+ * ---------------------------------------------------------------
+ * 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.
+ * ---------------------------------------------------------------
+ */
+
+/*
+ * This routine figures out the correct timeout for a particular IRQ.
+ * It uses the smallest timeout of all of the serial ports in a
+ * particular interrupt chain.  Now only used for IRQ 0....
+ */
+static void figure_IRQ_timeout(int irq)
+{
+	struct	async_struct	*info;
+	int	timeout = 60*HZ;	/* 60 seconds === a long time :-) */
+
+	info = IRQ_ports[irq];
+	if (!info) {
+		IRQ_timeout[irq] = 60*HZ;
+		return;
+	}
+	while (info) {
+		if (info->timeout < timeout)
+			timeout = info->timeout;
+		info = info->next_port;
+	}
+	if (!irq)
+		timeout = timeout / 2;
+	IRQ_timeout[irq] = timeout ? timeout : 1;
+}
+
+static int startup(struct async_struct * info)
+{
+	unsigned long flags;
+	int	retval=0;
+	void (*handler)(int, void *, struct pt_regs *);
+	struct serial_state *state= info->state;
+	unsigned long page;
+
+	page = get_free_page(GFP_KERNEL);
+	if (!page)
+		return -ENOMEM;
+
+	save_flags(flags); cli();
+
+	if (info->flags & ASYNC_INITIALIZED) {
+		free_page(page);
+		goto errout;
+	}
+	if (!state->port || !state->type) {
+		if (info->tty)
+			set_bit(TTY_IO_ERROR, &info->tty->flags);
+		free_page(page);
+		goto errout;
+	}
+	if (info->xmit_buf)
+		free_page(page);
+	else
+		info->xmit_buf = (unsigned char *) page;
+
+#ifdef SERIAL_DEBUG_OPEN
+	baget_printk("starting up ttys%d (irq %d)...", info->line, state->irq);
+#endif
+
+	if (uart_config[info->state->type].flags & UART_STARTECH) {
+		/* Wake up UART */
+		serial_outp(info, VAC_UART_MODE, 0);
+		serial_outp(info, VAC_UART_INT_MASK, 0);
+	}
+
+	/*
+	 * Allocate the IRQ if necessary
+	 */
+	if (state->irq && (!IRQ_ports[state->irq] ||
+			  !IRQ_ports[state->irq]->next_port)) {
+
+		if (IRQ_ports[state->irq]) {
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+			free_irq(state->irq, NULL);
+				handler = rs_interrupt;
+#else
+			retval = -EBUSY;
+			goto errout;
+#endif /* CONFIG_SERIAL_SHARE_IRQ */
+		} else 
+			handler = rs_interrupt_single;
+
+
+		retval = request_irq(state->irq, handler, IRQ_T(info),
+				     "serial", NULL);
+		if (retval) {
+			if (capable(CAP_SYS_ADMIN)) {
+				if (info->tty)
+					set_bit(TTY_IO_ERROR,
+						&info->tty->flags);
+				retval = 0;
+			}
+			goto errout;
+		}
+	}
+
+	/*
+	 * Insert serial port into IRQ chain.
+	 */
+	info->prev_port = 0;
+	info->next_port = IRQ_ports[state->irq];
+	if (info->next_port)
+		info->next_port->prev_port = info;
+	IRQ_ports[state->irq] = info;
+	figure_IRQ_timeout(state->irq);
+
+	/*
+	 * Clear the interrupt registers.
+	 */
+     /* (void) serial_inw(info, VAC_UART_INT_STATUS); */   /* (see above) */
+	(void) serial_inw(info, VAC_UART_RX);
+
+	/*
+	 * Now, initialize the UART 
+	 */
+	serial_outp(info, VAC_UART_MODE, VAC_UART_MODE_INITIAL); /*reset DLAB*/
+
+	/*
+	 * Finally, enable interrupts
+	 */
+	info->IER = VAC_UART_INT_RX_BREAK_CHANGE | VAC_UART_INT_RX_ERRS | \
+                        VAC_UART_INT_RX_READY;
+	serial_outp(info, VAC_UART_INT_MASK, info->IER); /*enable interrupts*/
+	
+	/*
+	 * And clear the interrupt registers again for luck.
+	 */
+	(void)serial_inp(info, VAC_UART_INT_STATUS);
+	(void)serial_inp(info, VAC_UART_RX);
+
+	if (info->tty)
+		clear_bit(TTY_IO_ERROR, &info->tty->flags);
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+	/*
+	 * Set up serial timers...
+	 */
+	timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
+	timer_active |= 1 << RS_TIMER;
+
+	/*
+	 * and set the speed of the serial port
+	 */
+	change_speed(info);
+
+	info->flags |= ASYNC_INITIALIZED;
+	restore_flags(flags);
+	return 0;
+	
+errout:
+	restore_flags(flags);
+	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 async_struct * info)
+{
+	unsigned long	flags;
+	struct serial_state *state;
+	int		retval;
+
+	if (!(info->flags & ASYNC_INITIALIZED))
+		return;
+
+	state = info->state;
+
+#ifdef SERIAL_DEBUG_OPEN
+	baget_printk("Shutting down serial port %d (irq %d)....", info->line,
+	       state->irq);
+#endif
+	
+	save_flags(flags); cli(); /* Disable interrupts */
+
+	/*
+	 * 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);
+	
+	/*
+	 * First unlink the serial port from the IRQ chain...
+	 */
+	if (info->next_port)
+		info->next_port->prev_port = info->prev_port;
+	if (info->prev_port)
+		info->prev_port->next_port = info->next_port;
+	else
+		IRQ_ports[state->irq] = info->next_port;
+	figure_IRQ_timeout(state->irq);
+	
+	/*
+	 * Free the IRQ, if necessary
+	 */
+	if (state->irq && (!IRQ_ports[state->irq] ||
+			  !IRQ_ports[state->irq]->next_port)) {
+		if (IRQ_ports[state->irq]) {
+			free_irq(state->irq, NULL);
+			retval = request_irq(state->irq, rs_interrupt_single,
+					     IRQ_T(info), "serial", NULL);
+			
+			if (retval)
+				printk("serial shutdown: request_irq: error %d"
+				       "  Couldn't reacquire IRQ.\n", retval);
+		} else
+			free_irq(state->irq, NULL);
+	}
+
+	if (info->xmit_buf) {
+		free_page((unsigned long) info->xmit_buf);
+		info->xmit_buf = 0;
+	}
+
+	info->IER = 0;
+	serial_outp(info, VAC_UART_INT_MASK, 0x00);	/* disable all intrs */
+	
+	/* disable break condition */
+	serial_out(info, VAC_UART_MODE, serial_inp(info, VAC_UART_MODE) & \
+		   ~VAC_UART_MODE_SEND_BREAK);
+	
+	if (info->tty)
+		set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+	info->flags &= ~ASYNC_INITIALIZED;
+	restore_flags(flags);
+}
+
+/*
+ *  When we set line mode, we call this function 
+ *  for Baget-specific adjustments.
+ */
+
+static inline unsigned short vac_uart_mode_fixup (unsigned short cval)
+{
+#ifdef QUAD_UART_SPEED
+	/* 
+	 *  When we are using 4-x advantage in speed:
+	 *
+	 *  Disadvantage : can't support 75, 150 bauds
+	 *  Advantage    : can support 19200, 38400 bauds
+	 */
+	char speed = 7 & (cval >> 10);
+	cval &= ~(7 << 10);
+	cval |= VAC_UART_MODE_BAUD(speed-2);
+#endif
+
+	/* 
+	 *  In general, we have Tx and Rx ON all time
+	 *  and use int mask flag for their disabling.
+	 */
+	cval |= VAC_UART_MODE_RX_ENABLE;
+	cval |= VAC_UART_MODE_TX_ENABLE;
+	cval |= VAC_UART_MODE_CHAR_RX_ENABLE;
+	cval |= VAC_UART_MODE_CHAR_TX_ENABLE;
+
+        /* Low 4 bits are not used in UART */	
+	cval &= ~0xf; 
+
+	return cval; 
+}
+
+/*
+ * 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 async_struct *info)
+{
+	unsigned short port;
+	int	quot = 0, baud_base, baud;
+	unsigned cflag, cval;
+	int	bits;
+	unsigned long	flags;
+
+	if (!info->tty || !info->tty->termios)
+		return;
+	cflag = info->tty->termios->c_cflag;
+	if (!(port = info->port))
+		return;
+
+	/* byte size and parity */
+	switch (cflag & CSIZE) {
+	      case CS7: cval = 0x0;  bits = 9; break;
+	      case CS8: cval = VAC_UART_MODE_8BIT_CHAR; bits = 10; break;
+	      /* Never happens, but GCC is too dumb to figure it out */
+	      case CS5: 
+	      case CS6: 
+	      default:  cval = 0x0; bits = 9; break;
+	      }
+	cval &= ~VAC_UART_MODE_PARITY_ENABLE;
+	if (cflag & PARENB) {
+		cval |= VAC_UART_MODE_PARITY_ENABLE;
+		bits++;
+	}
+	if (cflag & PARODD)
+		cval |= VAC_UART_MODE_PARITY_ODD;
+
+	/* Determine divisor based on baud rate */
+	baud = tty_get_baud_rate(info->tty);
+	baud_base = info->state->baud_base;
+	if (baud == 38400 &&
+	    ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
+		quot = info->state->custom_divisor;
+	else {
+		if (baud == 134)
+			/* Special case since 134 is really 134.5 */
+			quot = (2*baud_base / 269);
+		else if (baud)
+			quot = baud_base / baud;
+	}
+	/* If the quotient is ever zero, default to 9600 bps */
+	if (!quot)
+		quot = baud_base / 9600;
+	info->quot = quot;
+	info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
+	info->timeout += HZ/50;		/* Add .02 seconds of slop */
+
+	serial_out(info, VAC_UART_INT_MASK, info->IER);
+
+	/*
+	 * Set up parity check flag
+	 */
+#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
+
+	info->read_status_mask = VAC_UART_STATUS_RX_ERR_OVERRUN | \
+                VAC_UART_STATUS_TX_EMPTY | VAC_UART_STATUS_RX_READY;
+	if (I_INPCK(info->tty))
+		info->read_status_mask |= VAC_UART_STATUS_RX_ERR_FRAME | \
+			VAC_UART_STATUS_RX_ERR_PARITY;
+	if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
+		info->read_status_mask |= VAC_UART_STATUS_RX_BREAK_CHANGE;
+	
+	/*
+	 * Characters to ignore
+	 */
+	info->ignore_status_mask = 0;
+	if (I_IGNPAR(info->tty))
+		info->ignore_status_mask |= VAC_UART_STATUS_RX_ERR_PARITY | \
+			VAC_UART_STATUS_RX_ERR_FRAME;
+	if (I_IGNBRK(info->tty)) {
+		info->ignore_status_mask |= VAC_UART_STATUS_RX_BREAK_CHANGE;
+		/*
+		 * If we're ignore parity and break indicators, ignore 
+		 * overruns too.  (For real raw support).
+		 */
+		if (I_IGNPAR(info->tty))
+			info->ignore_status_mask |= \
+				VAC_UART_STATUS_RX_ERR_OVERRUN;
+	}
+	/*
+	 * !!! ignore all characters if CREAD is not set
+	 */
+	if ((cflag & CREAD) == 0)
+		info->ignore_status_mask |= VAC_UART_STATUS_RX_READY;
+	save_flags(flags); cli();
+
+
+	switch (baud) {
+	default:
+	case 9600:
+		cval |= VAC_UART_MODE_BAUD(7);
+		break;
+	case 4800:
+		cval |= VAC_UART_MODE_BAUD(6);
+		break;
+	case 2400:
+		cval |= VAC_UART_MODE_BAUD(5);
+		break;
+	case 1200:
+		cval |= VAC_UART_MODE_BAUD(4);
+		break;
+	case 600:
+		cval |= VAC_UART_MODE_BAUD(3);
+		break;
+	case 300:
+		cval |= VAC_UART_MODE_BAUD(2);
+		break;
+#ifndef QUAD_UART_SPEED
+	case 150:
+#else
+	case 38400:
+#endif
+		cval |= VAC_UART_MODE_BAUD(1);
+		break;
+#ifndef QUAD_UART_SPEED
+	case 75:
+#else
+	case 19200:
+#endif
+		cval |= VAC_UART_MODE_BAUD(0);
+		break;
+	}
+
+	/* Baget VAC need some adjustments for computed value */
+	cval = vac_uart_mode_fixup(cval);
+
+	serial_outp(info, VAC_UART_MODE, cval);
+	restore_flags(flags);
+}
+
+static void rs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	unsigned long flags;
+
+	if (serial_paranoia_check(info, tty->device, "rs_put_char"))
+		return;
+
+	if (!tty || !info->xmit_buf)
+		return;
+
+	save_flags(flags); cli();
+	if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
+		restore_flags(flags);
+		return;
+	}
+
+	info->xmit_buf[info->xmit_head++] = ch;
+	info->xmit_head &= SERIAL_XMIT_SIZE-1;
+	info->xmit_cnt++;
+	restore_flags(flags);
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	unsigned long flags;
+				
+	if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
+		return;
+
+	if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+	    !info->xmit_buf)
+		return;
+
+	save_flags(flags); cli();
+        info->IER |= VAC_UART_INT_TX_EMPTY;
+	serial_out(info, VAC_UART_INT_MASK, info->IER);
+	restore_flags(flags);
+}
+
+static int rs_write(struct tty_struct * tty, int from_user,
+		    const unsigned char *buf, int count)
+{
+	int	c, ret = 0;
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	unsigned long flags;
+		
+	if (serial_paranoia_check(info, tty->device, "rs_write"))
+		return 0;
+
+	if (!tty || !info->xmit_buf || !tmp_buf)
+		return 0;
+
+	save_flags(flags);
+	if (from_user) {
+		down(&tmp_buf_sem);
+		while (1) {
+			c = MIN(count,
+				MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+				    SERIAL_XMIT_SIZE - info->xmit_head));
+			if (c <= 0)
+				break;
+
+			c -= copy_from_user(tmp_buf, buf, c);
+			if (!c) {
+				if (!ret)
+					ret = -EFAULT;
+				break;
+			}
+			cli();
+			c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+				       SERIAL_XMIT_SIZE - info->xmit_head));
+			memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
+			info->xmit_head = ((info->xmit_head + c) &
+					   (SERIAL_XMIT_SIZE-1));
+			info->xmit_cnt += c;
+			restore_flags(flags);
+			buf += c;
+			count -= c;
+			ret += c;
+		}
+		up(&tmp_buf_sem);
+	} else {
+		while (1) {
+			cli();		
+			c = MIN(count,
+				MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+				    SERIAL_XMIT_SIZE - info->xmit_head));
+			if (c <= 0) {
+				restore_flags(flags);
+				break;
+			}
+			memcpy(info->xmit_buf + info->xmit_head, buf, c);
+			info->xmit_head = ((info->xmit_head + c) &
+					   (SERIAL_XMIT_SIZE-1));
+			info->xmit_cnt += c;
+			restore_flags(flags);
+			buf += c;
+			count -= c;
+			ret += c;
+		}
+	}
+	if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
+            !(info->IER & VAC_UART_INT_TX_EMPTY)) {
+                info->IER |= VAC_UART_INT_TX_EMPTY;
+		serial_out(info, VAC_UART_INT_MASK, info->IER);
+	}
+	return ret;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	int	ret;
+				
+	if (serial_paranoia_check(info, tty->device, "rs_write_room"))
+		return 0;
+	ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+	if (ret < 0)
+		ret = 0;
+	return ret;
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+				
+	if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
+		return 0;
+	return info->xmit_cnt;
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	unsigned long flags; 
+				
+	if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
+		return;
+
+	save_flags(flags); cli();
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+	restore_flags(flags); 
+
+	wake_up_interruptible(&tty->write_wait);
+	if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+	    tty->ldisc.write_wakeup)
+		(tty->ldisc.write_wakeup)(tty);
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ */
+static void rs_send_xchar(struct tty_struct *tty, char ch)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+
+	if (serial_paranoia_check(info, tty->device, "rs_send_char"))
+		return;
+
+	info->x_char = ch;
+	if (ch) {
+		/* Make sure transmit interrupts are on */
+                info->IER |= VAC_UART_INT_TX_EMPTY;
+		serial_out(info, VAC_UART_INT_MASK, info->IER);
+	}
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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 async_struct *info = (struct async_struct *)tty->driver_data;
+
+#ifdef SERIAL_DEBUG_THROTTLE
+	char	buf[64];
+	
+	baget_printk("throttle %s: %d....\n", tty_name(tty, buf),
+	       tty->ldisc.chars_in_buffer(tty));
+#endif
+
+	if (serial_paranoia_check(info, tty->device, "rs_throttle"))
+		return;
+	
+	if (I_IXOFF(tty))
+		rs_send_xchar(tty, STOP_CHAR(tty));
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+	char	buf[64];
+	
+	baget_printk("unthrottle %s: %d....\n", tty_name(tty, buf),
+	       tty->ldisc.chars_in_buffer(tty));
+#endif
+
+	if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
+		return;
+	
+	if (I_IXOFF(tty)) {
+		if (info->x_char)
+			info->x_char = 0;
+		else
+			rs_send_xchar(tty, START_CHAR(tty));
+	}
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct async_struct * info,
+			   struct serial_struct * retinfo)
+{
+	struct serial_struct tmp;
+	struct serial_state *state = info->state;
+   
+	if (!retinfo)
+		return -EFAULT;
+	memset(&tmp, 0, sizeof(tmp));
+	tmp.type = state->type;
+	tmp.line = state->line;
+	tmp.port = state->port;
+	tmp.irq = state->irq;
+	tmp.flags = state->flags;
+	tmp.xmit_fifo_size = state->xmit_fifo_size;
+	tmp.baud_base = state->baud_base;
+	tmp.close_delay = state->close_delay;
+	tmp.closing_wait = state->closing_wait;
+	tmp.custom_divisor = state->custom_divisor;
+	tmp.hub6 = state->hub6;
+	if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
+		return -EFAULT;
+	return 0;
+}
+
+static int set_serial_info(struct async_struct * info,
+			   struct serial_struct * new_info)
+{
+	struct serial_struct new_serial;
+ 	struct serial_state old_state, *state;
+	unsigned int		i,change_irq,change_port;
+	int 			retval = 0;
+
+	if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
+		return -EFAULT;
+	state = info->state;
+	old_state = *state;
+  
+	change_irq = new_serial.irq != state->irq;
+	change_port = (new_serial.port != state->port) ||
+		(new_serial.hub6 != state->hub6);
+  
+	if (!capable(CAP_SYS_ADMIN)) {
+		if (change_irq || change_port ||
+		    (new_serial.baud_base != state->baud_base) ||
+		    (new_serial.type != state->type) ||
+		    (new_serial.close_delay != state->close_delay) ||
+		    (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
+		    ((new_serial.flags & ~ASYNC_USR_MASK) !=
+		     (state->flags & ~ASYNC_USR_MASK)))
+			return -EPERM;
+		state->flags = ((state->flags & ~ASYNC_USR_MASK) |
+			       (new_serial.flags & ASYNC_USR_MASK));
+		state->custom_divisor = new_serial.custom_divisor;
+		goto check_and_exit;
+	}
+
+	new_serial.irq = irq_cannonicalize(new_serial.irq);
+
+	if ((new_serial.irq >= NR_IRQS) || (new_serial.port > 0xffff) ||
+	    (new_serial.type < PORT_UNKNOWN) || (new_serial.type > PORT_MAX)) {
+		return -EINVAL;
+	}
+
+	if ((new_serial.type != state->type) ||
+	    (new_serial.xmit_fifo_size <= 0))
+		new_serial.xmit_fifo_size =
+			uart_config[state->type].dfl_xmit_fifo_size;
+
+	/* Make sure address is not already in use */
+	if (new_serial.type) {
+		for (i = 0 ; i < NR_PORTS; i++)
+			if ((state != &rs_table[i]) &&
+			    (rs_table[i].port == new_serial.port) &&
+			    rs_table[i].type)
+				return -EADDRINUSE;
+	}
+
+	if ((change_port || change_irq) && (state->count > 1))
+		return -EBUSY;
+
+	/*
+	 * OK, past this point, all the error checking has been done.
+	 * At this point, we start making changes.....
+	 */
+
+	state->baud_base = new_serial.baud_base;
+	state->flags = ((state->flags & ~ASYNC_FLAGS) |
+			(new_serial.flags & ASYNC_FLAGS));
+	info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
+		       (info->flags & ASYNC_INTERNAL_FLAGS));
+	state->custom_divisor = new_serial.custom_divisor;
+	state->type = new_serial.type;
+	state->close_delay = new_serial.close_delay * HZ/100;
+	state->closing_wait = new_serial.closing_wait * HZ/100;
+	info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+	info->xmit_fifo_size = state->xmit_fifo_size =
+		new_serial.xmit_fifo_size;
+
+	release_region(state->port,8); 
+	if (change_port || change_irq) {
+		/*
+		 * We need to shutdown the serial port at the old
+		 * port/irq combination.
+		 */
+		shutdown(info);
+		state->irq = new_serial.irq;
+		info->port = state->port = new_serial.port;
+		info->hub6 = state->hub6 = new_serial.hub6;
+	}
+	if (state->type != PORT_UNKNOWN)
+		request_region(state->port,8,"serial(set)");
+
+	
+check_and_exit:
+	if (!state->port || !state->type)
+		return 0;
+	if (state->flags & ASYNC_INITIALIZED) {
+		if (((old_state.flags & ASYNC_SPD_MASK) !=
+		     (state->flags & ASYNC_SPD_MASK)) ||
+		    (old_state.custom_divisor != state->custom_divisor)) {
+			if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+				info->tty->alt_speed = 57600;
+			if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+				info->tty->alt_speed = 115200;
+			if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+				info->tty->alt_speed = 230400;
+			if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+				info->tty->alt_speed = 460800;
+			change_speed(info);
+		}
+	} else
+		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 async_struct * info, unsigned int *value)
+{
+	unsigned short status;
+	unsigned int result;
+	unsigned long flags; 
+
+	save_flags(flags); cli();
+	status = serial_inw(info, VAC_UART_INT_STATUS);
+	restore_flags(flags);
+	result = ((status & VAC_UART_STATUS_TX_EMPTY) ? TIOCSER_TEMT : 0);
+	return put_user(result,value);
+}
+
+
+static int get_modem_info(struct async_struct * info, unsigned int *value)
+{
+	unsigned int result;
+
+	result = TIOCM_CAR | TIOCM_DSR;
+	return put_user(result,value);
+}
+
+static int set_modem_info(struct async_struct * info, unsigned int cmd,
+			  unsigned int *value)
+{
+	int error;
+	unsigned int arg;
+
+	error = get_user(arg, value);
+	if (error)
+		return error;
+	switch (cmd) {
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int do_autoconfig(struct async_struct * info)
+{
+	int			retval;
+	
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	
+	if (info->state->count > 1)
+		return -EBUSY;
+	
+	shutdown(info);
+
+	autoconfig(info->state);
+
+	retval = startup(info);
+	if (retval)
+		return retval;
+	return 0;
+}
+
+/*
+ * rs_break() --- routine which turns the break handling on or off
+ */
+static void rs_break(struct tty_struct *tty, int break_state)
+{
+	struct async_struct * info = (struct async_struct *)tty->driver_data;
+	unsigned long flags;
+	
+	if (serial_paranoia_check(info, tty->device, "rs_break"))
+		return;
+
+	if (!info->port)
+		return;
+	save_flags(flags); cli();
+	if (break_state == -1)
+		serial_outp(info, VAC_UART_MODE,
+			   serial_inp(info, VAC_UART_MODE) | \
+			    VAC_UART_MODE_SEND_BREAK);
+	else
+		serial_outp(info, VAC_UART_MODE,
+			   serial_inp(info, VAC_UART_MODE) & \
+			    ~VAC_UART_MODE_SEND_BREAK);
+	restore_flags(flags);
+}
+
+static int rs_ioctl(struct tty_struct *tty, struct file * file,
+		    unsigned int cmd, unsigned long arg)
+{
+	int error;
+	struct async_struct * info = (struct async_struct *)tty->driver_data;
+	struct async_icount cprev, cnow;	/* kernel counter temps */
+	struct serial_icounter_struct *p_cuser;	/* user space */
+	unsigned long flags; 
+
+	if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
+		return -ENODEV;
+
+	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+	    (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
+	    (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
+		if (tty->flags & (1 << TTY_IO_ERROR))
+		    return -EIO;
+	}
+	
+	switch (cmd) {
+		case TIOCMGET:
+			return get_modem_info(info, (unsigned int *) arg);
+		case TIOCMBIS:
+		case TIOCMBIC:
+		case TIOCMSET:
+			return set_modem_info(info, cmd, (unsigned int *) arg);
+		case TIOCGSERIAL:
+			return get_serial_info(info,
+					       (struct serial_struct *) arg);
+		case TIOCSSERIAL:
+			return set_serial_info(info,
+					       (struct serial_struct *) arg);
+		case TIOCSERCONFIG:
+			return do_autoconfig(info);
+
+		case TIOCSERGETLSR: /* Get line status register */
+			return get_lsr_info(info, (unsigned int *) arg);
+
+		case TIOCSERGSTRUCT:
+			if (copy_to_user((struct async_struct *) arg,
+					 info, sizeof(struct async_struct)))
+				return -EFAULT;
+			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:
+			save_flags(flags); cli();
+			/* note the counters on entry */
+			cprev = info->state->icount;
+			restore_flags(flags);
+			while (1) {
+				interruptible_sleep_on(&info->delta_msr_wait);
+				/* see if a signal did it */
+				if (signal_pending(current))
+					return -ERESTARTSYS;
+				save_flags(flags); cli(); 
+				cnow = info->state->icount; /* atomic copy */
+				restore_flags(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:
+			save_flags(flags); cli(); 
+			cnow = info->state->icount;
+			restore_flags(flags);
+			p_cuser = (struct serial_icounter_struct *) arg;
+			error = put_user(cnow.cts, &p_cuser->cts);
+			if (error) return error;
+			error = put_user(cnow.dsr, &p_cuser->dsr);
+			if (error) return error;
+			error = put_user(cnow.rng, &p_cuser->rng);
+			if (error) return error;
+			error = put_user(cnow.dcd, &p_cuser->dcd);
+			if (error) return error;
+                        error = put_user(cnow.rx, &p_cuser->rx);
+                        if (error) return error;
+                        error = put_user(cnow.tx, &p_cuser->tx);
+                        if (error) return error;
+                        error = put_user(cnow.frame, &p_cuser->frame);
+                        if (error) return error;
+                        error = put_user(cnow.overrun, &p_cuser->overrun);
+                        if (error) return error;
+                        error = put_user(cnow.parity, &p_cuser->parity);
+                        if (error) return error;
+                        error = put_user(cnow.brk, &p_cuser->brk);
+                        if (error) return error;
+                        error = put_user(cnow.buf_overrun, &p_cuser->buf_overrun);
+
+			if (error) return error;
+			return 0;
+
+                case TIOCSERGWILD:
+                case TIOCSERSWILD:
+                       /* "setserial -W" is called in Debian boot */
+                        printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
+                        return 0;
+ 
+		default:
+			return -ENOIOCTLCMD;
+		}
+	return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+	struct async_struct *info = (struct async_struct *)tty->driver_data;
+	
+	if (   (tty->termios->c_cflag == old_termios->c_cflag)
+	    && (   RELEVANT_IFLAG(tty->termios->c_iflag) 
+		== RELEVANT_IFLAG(old_termios->c_iflag)))
+	  return;
+
+	change_speed(info);
+
+	/* Handle turning off CRTSCTS */
+	if ((old_termios->c_cflag & CRTSCTS) &&
+	    !(tty->termios->c_cflag & CRTSCTS)) {
+		tty->hw_stopped = 0;
+		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 async_struct * info = (struct async_struct *)tty->driver_data;
+	struct serial_state *state;
+	unsigned long flags;
+
+	if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
+		return;
+
+	state = info->state;
+	
+	save_flags(flags); cli();
+	
+	if (tty_hung_up_p(filp)) {
+		DBG_CNT("before DEC-hung");
+		MOD_DEC_USE_COUNT;
+		restore_flags(flags);
+		return;
+	}
+	
+#ifdef SERIAL_DEBUG_OPEN
+	baget_printk("rs_close ttys%d, count = %d\n", 
+		     info->line, state->count);
+#endif
+	if ((tty->count == 1) && (state->count != 1)) {
+		/*
+		 * Uh, oh.  tty->count is 1, which means that the tty
+		 * structure will be freed.  state->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.
+		 */
+		baget_printk("rs_close: bad serial port count; "
+			     "tty->count is 1, "
+			     "state->count is %d\n", state->count);
+		state->count = 1;
+	}
+	if (--state->count < 0) {
+		baget_printk("rs_close: bad serial port count for "
+			     "ttys%d: %d\n",
+			     info->line, state->count);
+		state->count = 0;
+	}
+	if (state->count) {
+		DBG_CNT("before DEC-2");
+		MOD_DEC_USE_COUNT;
+		restore_flags(flags);
+		return;
+	}
+	info->flags |= ASYNC_CLOSING;
+	/*
+	 * Save the termios structure, since this port may have
+	 * separate termios for callout and dialin.
+	 */
+	if (info->flags & ASYNC_NORMAL_ACTIVE)
+		info->state->normal_termios = *tty->termios;
+	if (info->flags & ASYNC_CALLOUT_ACTIVE)
+		info->state->callout_termios = *tty->termios;
+	/*
+	 * 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 &= ~(VAC_UART_INT_RX_BREAK_CHANGE | VAC_UART_INT_RX_ERRS);
+	info->read_status_mask &= ~VAC_UART_STATUS_RX_READY;
+	if (info->flags & ASYNC_INITIALIZED) {
+		serial_outw(info, VAC_UART_INT_MASK, info->IER);
+		/*
+		 * 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);
+	if (tty->driver.flush_buffer)
+		tty->driver.flush_buffer(tty);
+	if (tty->ldisc.flush_buffer)
+		tty->ldisc.flush_buffer(tty);
+	tty->closing = 0;
+	info->event = 0;
+	info->tty = 0;
+	if (info->blocked_open) {
+		if (info->close_delay) {
+			current->state = TASK_INTERRUPTIBLE;
+			current->timeout = jiffies + info->close_delay;
+			schedule();
+		}
+		wake_up_interruptible(&info->open_wait);
+	}
+	info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
+			 ASYNC_CLOSING);
+	wake_up_interruptible(&info->close_wait);
+	MOD_DEC_USE_COUNT;
+	restore_flags(flags);
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+	struct async_struct * info = (struct async_struct *)tty->driver_data;
+	unsigned long orig_jiffies, char_time;
+	int lsr;
+	
+	if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
+		return;
+
+	if (info->state->type == PORT_UNKNOWN)
+		return;
+
+        if (info->xmit_fifo_size == 0)
+                return; /* Just in case.... */
+
+	orig_jiffies = jiffies;
+	/*
+	 * Set the check interval to be 1/5 of the estimated time to
+	 * send a single character, and make it at least 1.  The check
+	 * interval should also be less than the timeout.
+	 * 
+	 * Note: we have to use pretty tight timings here to satisfy
+	 * the NIST-PCTS.
+	 */
+	char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
+	char_time = char_time / 5;
+	if (char_time == 0)
+		char_time = 1;
+	if (timeout)
+	  char_time = MIN(char_time, timeout);
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+	baget_printk("In rs_wait_until_sent(%d) check=%lu...", 
+		     timeout, char_time);
+	baget_printk("jiff=%lu...", jiffies);
+#endif
+	while (!((lsr = serial_inp(info, VAC_UART_INT_STATUS)) & \
+		 VAC_UART_STATUS_TX_EMPTY)) {
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+		baget_printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
+#endif
+		current->state = TASK_INTERRUPTIBLE;
+		current->counter = 0;	/* make us low-priority */
+		current->timeout = jiffies + char_time;
+		schedule();
+		if (signal_pending(current))
+			break;
+		if (timeout && ((orig_jiffies + timeout) < jiffies))
+			break;
+	}
+	current->state = TASK_RUNNING;
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+	baget_printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
+#endif
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void rs_hangup(struct tty_struct *tty)
+{
+	struct async_struct * info = (struct async_struct *)tty->driver_data;
+	struct serial_state *state = info->state;
+	
+	if (serial_paranoia_check(info, tty->device, "rs_hangup"))
+		return;
+
+	state = info->state;
+	
+	rs_flush_buffer(tty);
+	shutdown(info);
+	info->event = 0;
+	state->count = 0;
+	info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
+	info->tty = 0;
+	wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+			   struct async_struct *info)
+{
+	struct wait_queue wait = { current, NULL };
+	struct serial_state *state = info->state;
+	int		retval;
+	int		do_clocal = 0,  extra_count = 0;  
+	unsigned long   flags; 
+
+	/*
+	 * 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) ||
+	    (info->flags & ASYNC_CLOSING)) {
+		if (info->flags & ASYNC_CLOSING)
+			interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+		return ((info->flags & ASYNC_HUP_NOTIFY) ?
+			-EAGAIN : -ERESTARTSYS);
+#else
+		return -EAGAIN;
+#endif
+	}
+
+	/*
+	 * If this is a callout device, then just make sure the normal
+	 * device isn't being used.
+	 */
+	if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
+		if (info->flags & ASYNC_NORMAL_ACTIVE)
+			return -EBUSY;
+		if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+		    (info->flags & ASYNC_SESSION_LOCKOUT) &&
+		    (info->session != current->session))
+		    return -EBUSY;
+		if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+		    (info->flags & ASYNC_PGRP_LOCKOUT) &&
+		    (info->pgrp != current->pgrp))
+		    return -EBUSY;
+		info->flags |= ASYNC_CALLOUT_ACTIVE;
+		return 0;
+	}
+	
+	/*
+	 * 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))) {
+		if (info->flags & ASYNC_CALLOUT_ACTIVE)
+			return -EBUSY;
+		info->flags |= ASYNC_NORMAL_ACTIVE;
+		return 0;
+	}
+
+	if (info->flags & ASYNC_CALLOUT_ACTIVE) {
+		if (state->normal_termios.c_cflag & CLOCAL)
+			do_clocal = 1;
+	} else {
+		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, state->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(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+	baget_printk("block_til_ready before block: ttys%d, count = %d\n",
+	       state->line, state->count);
+#endif
+	save_flags(flags); cli(); 
+	if (!tty_hung_up_p(filp)) {
+		extra_count = 1; 
+		state->count--;
+	}
+	restore_flags(flags); 
+	info->blocked_open++;
+	while (1) {
+		current->state = TASK_INTERRUPTIBLE;
+		if (tty_hung_up_p(filp) ||
+		    !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+			if (info->flags & ASYNC_HUP_NOTIFY)
+				retval = -EAGAIN;
+			else
+				retval = -ERESTARTSYS;	
+#else
+			retval = -EAGAIN;
+#endif
+			break;
+		}
+		if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
+		    !(info->flags & ASYNC_CLOSING))
+			break;
+		if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+#ifdef SERIAL_DEBUG_OPEN
+		baget_printk("block_til_ready blocking: ttys%d, count = %d\n",
+		       info->line, state->count);
+#endif
+		schedule();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&info->open_wait, &wait);
+	if (extra_count)
+		state->count++;
+	info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+	baget_printk("block_til_ready after blocking: ttys%d, count = %d\n",
+	       info->line, state->count);
+#endif
+	if (retval)
+		return retval;
+	info->flags |= ASYNC_NORMAL_ACTIVE;
+	return 0;
+}
+
+static int get_async_struct(int line, struct async_struct **ret_info)
+{
+	struct async_struct *info;
+	struct serial_state *sstate;
+
+	sstate = rs_table + line;
+	sstate->count++;
+	if (sstate->info) {
+		*ret_info = sstate->info;
+		return 0;
+	}
+	info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
+	if (!info) {
+		sstate->count--;
+		return -ENOMEM;
+	}
+	memset(info, 0, sizeof(struct async_struct));
+	info->magic = SERIAL_MAGIC;
+	info->port = sstate->port;
+	info->flags = sstate->flags;
+	info->xmit_fifo_size = sstate->xmit_fifo_size;
+	info->line = line;
+	info->tqueue.routine = do_softint;
+	info->tqueue.data = info;
+	info->state = sstate;
+	if (sstate->info) {
+		kfree_s(info, sizeof(struct async_struct));
+		*ret_info = sstate->info;
+		return 0;
+	}
+	*ret_info = sstate->info = info;
+	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 rs_open(struct tty_struct *tty, struct file * filp)
+{
+	struct async_struct	*info;
+	int 			retval, line;
+	unsigned long		page;
+
+	MOD_INC_USE_COUNT; 
+	line = MINOR(tty->device) - tty->driver.minor_start;
+	if ((line < 0) || (line >= NR_PORTS)) {
+		MOD_DEC_USE_COUNT; 
+		return -ENODEV;
+	}
+	retval = get_async_struct(line, &info);
+	if (retval) {
+		MOD_DEC_USE_COUNT;
+		return retval;
+	}
+        tty->driver_data = info;
+        info->tty = tty;
+	if (serial_paranoia_check(info, tty->device, "rs_open")) {
+		MOD_DEC_USE_COUNT;
+		return -ENODEV;
+	}
+
+#ifdef SERIAL_DEBUG_OPEN
+	baget_printk("rs_open %s%d, count = %d\n", 
+		     tty->driver.name, info->line,
+		     info->state->count);
+#endif
+	info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+	if (!tmp_buf) {
+		page = get_free_page(GFP_KERNEL);
+		if (!page) {
+			MOD_DEC_USE_COUNT;  
+			return -ENOMEM;
+		}
+		if (tmp_buf)
+			free_page(page);
+		else
+			tmp_buf = (unsigned char *) page;
+	}
+
+	/*
+	 * If the port is the middle of closing, bail out now
+	 */
+	if (tty_hung_up_p(filp) ||
+	    (info->flags & ASYNC_CLOSING)) {
+		if (info->flags & ASYNC_CLOSING)
+			interruptible_sleep_on(&info->close_wait);
+		MOD_DEC_USE_COUNT; 
+#ifdef SERIAL_DO_RESTART
+		return ((info->flags & ASYNC_HUP_NOTIFY) ?
+			-EAGAIN : -ERESTARTSYS);
+#else
+		return -EAGAIN;
+#endif
+	}
+
+	/*
+	 * Start up serial port
+	 */
+	retval = startup(info);
+	if (retval) {
+		MOD_DEC_USE_COUNT; 
+		return retval;
+	}
+
+	retval = block_til_ready(tty, filp, info);
+	if (retval) {
+		 MOD_DEC_USE_COUNT;
+#ifdef SERIAL_DEBUG_OPEN
+		 baget_printk("rs_open returning after block_til_ready "
+			      "with %d\n",
+			      retval);
+#endif
+		 return retval;
+	}
+
+	if ((info->state->count == 1) &&
+	    (info->flags & ASYNC_SPLIT_TERMIOS)) {
+		if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+			*tty->termios = info->state->normal_termios;
+		else 
+			*tty->termios = info->state->callout_termios;
+		change_speed(info);
+	}
+#ifdef CONFIG_SERIAL_CONSOLE
+	if (sercons.cflag && sercons.index == line) {
+		tty->termios->c_cflag = sercons.cflag;
+		sercons.cflag = 0;
+		change_speed(info);
+	}
+#endif
+	info->session = current->session;
+	info->pgrp = current->pgrp;
+
+#ifdef SERIAL_DEBUG_OPEN
+	baget_printk("rs_open ttys%d successful...", info->line);
+#endif
+	return 0;
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static inline int line_info(char *buf, struct serial_state *state)
+{
+	struct async_struct *info = state->info, scr_info;
+	int	ret;
+
+	ret = sprintf(buf, "%d: uart:%s port:%X irq:%d",
+		      state->line, uart_config[state->type].name, 
+		      state->port, state->irq);
+
+	if (!state->port || (state->type == PORT_UNKNOWN)) {
+		ret += sprintf(buf+ret, "\n");
+		return ret;
+	}
+
+	/*
+	 * Figure out the current RS-232 lines
+	 */
+	if (!info) {
+		info = &scr_info;	/* This is just for serial_{in,out} */
+
+		info->magic = SERIAL_MAGIC;
+		info->port = state->port;
+		info->flags = state->flags;
+		info->quot = 0;
+		info->tty = 0;
+	}
+	
+	if (info->quot) {
+		ret += sprintf(buf+ret, " baud:%d",
+			       state->baud_base / info->quot);
+	}
+
+	ret += sprintf(buf+ret, " tx:%d rx:%d",
+		      state->icount.tx, state->icount.rx);
+
+	if (state->icount.frame)
+		ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
+	
+	if (state->icount.parity)
+		ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
+	
+	if (state->icount.brk)
+		ret += sprintf(buf+ret, " brk:%d", state->icount.brk);	
+
+	if (state->icount.overrun)
+		ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
+
+	return ret;
+}
+
+int rs_read_proc(char *page, char **start, off_t off, int count,
+		 int *eof, void *data)
+{
+	int i, len = 0, l;
+	off_t	begin = 0;
+
+	len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
+	for (i = 0; i < NR_PORTS && len < 4000; i++) {
+                l = line_info(page + len, &rs_table[i]);
+                len += l;
+ 		if (len+begin > off+count)
+			goto done;
+		if (len+begin < off) {
+			begin += len;
+			len = 0;
+		}
+	}
+	*eof = 1;
+done:
+	if (off >= len+begin)
+		return 0;
+	*start = page + (begin-off);
+	return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+/*
+ * ---------------------------------------------------------------------
+ * rs_init() and friends
+ *
+ * rs_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 _INLINE_ void show_serial_version(void)
+{
+ 	printk(KERN_INFO "%s version %s with", serial_name, serial_version);
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+	printk(" SHARE_IRQ");
+#endif
+#define SERIAL_OPT
+#ifdef CONFIG_SERIAL_DETECT_IRQ
+	printk(" DETECT_IRQ");
+#endif
+#ifdef SERIAL_OPT
+	printk(" enabled\n");
+#else
+	printk(" no serial options enabled\n");
+#endif
+#undef SERIAL_OPT
+}
+
+
+/*
+ * This routine is called by rs_init() to initialize a specific serial
+ * port.  It determines what type of UART chip this serial port is
+ * using: 8250, 16450, 16550, 16550A.  The important question is
+ * whether or not this UART is a 16550A or not, since this will
+ * determine whether or not we can use its FIFO features or not.
+ */
+
+/*
+ *  Functionality of this function is reduced: we already know we have a VAC,
+ *  but still need to perform some important actions (see code :-).
+ */
+static void autoconfig(struct serial_state * state)
+{
+	struct async_struct *info, scr_info; 
+	unsigned long flags;
+
+	/* Setting up important parameters */
+	state->type = VAC_UART_TYPE;
+	state->xmit_fifo_size = uart_config[state->type].dfl_xmit_fifo_size;
+
+	info = &scr_info;       /* This is just for serial_{in,out} */   
+
+	info->magic = SERIAL_MAGIC;
+        info->port  = state->port;
+        info->flags = state->flags;
+
+        save_flags(flags); cli();
+
+	/* + Flush VAC input fifo */ 
+        (void)serial_in(info, VAC_UART_RX);
+        (void)serial_in(info, VAC_UART_RX);
+        (void)serial_in(info, VAC_UART_RX);
+        (void)serial_in(info, VAC_UART_RX);
+
+	/* Disable interrupts */
+        serial_outp(info, VAC_UART_INT_MASK, 0);
+
+        restore_flags(flags);
+}
+
+int register_serial(struct serial_struct *req);
+void unregister_serial(int line);
+
+EXPORT_SYMBOL(register_serial);
+EXPORT_SYMBOL(unregister_serial);
+
+/*
+ *  Important function for VAC UART check and reanimation.
+ */
+
+static void rs_timer(void)
+{
+        static unsigned long last_strobe = 0;
+        struct async_struct *info;
+        unsigned int    i;
+        unsigned long flags;
+
+        if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
+                for (i=1; i < NR_IRQS; i++) {
+                        info = IRQ_ports[i];
+                        if (!info)
+                                continue;
+                        save_flags(flags); cli();
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+                        if (info->next_port) {
+                                do {
+                                        serial_out(info, VAC_UART_INT_MASK, 0);
+                                        info->IER |= VAC_UART_INT_TX_EMPTY;
+                                        serial_out(info, VAC_UART_INT_MASK, 
+						   info->IER);
+                                        info = info->next_port;
+                                } while (info);
+				rs_interrupt(i, NULL, NULL);
+                        } else
+#endif /* CONFIG_SERIAL_SHARE_IRQ */
+                                rs_interrupt_single(i, NULL, NULL);
+                        restore_flags(flags);
+                }
+        }
+        last_strobe = jiffies;
+        timer_table[RS_TIMER].expires = jiffies + RS_STROBE_TIME;
+        timer_active |= 1 << RS_TIMER;
+
+	/*
+	 *  It looks this code for case we share IRQ with console...
+	 */
+
+        if (IRQ_ports[0]) {
+                save_flags(flags); cli();
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+                rs_interrupt(0, NULL, NULL);
+#else
+                rs_interrupt_single(0, NULL, NULL);
+#endif
+                restore_flags(flags);
+
+                timer_table[RS_TIMER].expires = jiffies + IRQ_timeout[0] - 2;
+        }
+}
+ 
+/*
+ * The serial driver boot-time initialization code!
+ */
+__initfunc(int rs_init(void))
+{
+	int i;
+	struct serial_state * state;
+	extern void atomwide_serial_init (void);
+	extern void dualsp_serial_init (void);
+
+#ifdef CONFIG_ATOMWIDE_SERIAL
+	atomwide_serial_init ();
+#endif
+#ifdef CONFIG_DUALSP_SERIAL
+	dualsp_serial_init ();
+#endif
+
+	init_bh(SERIAL_BH, do_serial_bh);
+	timer_table[RS_TIMER].fn = rs_timer;
+	timer_table[RS_TIMER].expires = 0;
+
+	for (i = 0; i < NR_IRQS; i++) {
+		IRQ_ports[i] = 0;
+		IRQ_timeout[i] = 0;
+	}
+
+
+/*
+ *  It is not a good idea to share interrupts with console,
+ *  but it looks we cannot avoid it.
+ */
+#if 0 
+
+#ifdef CONFIG_SERIAL_CONSOLE
+	/*
+	 *	The interrupt of the serial console port
+	 *	can't be shared.
+	 */
+	if (sercons.flags & CON_CONSDEV) {
+		for(i = 0; i < NR_PORTS; i++)
+			if (i != sercons.index &&
+			    rs_table[i].irq == rs_table[sercons.index].irq)
+				rs_table[i].irq = 0;
+	}
+#endif
+
+#endif
+	show_serial_version();
+
+	/* Initialize the tty_driver structure */
+	
+	memset(&serial_driver, 0, sizeof(struct tty_driver));
+	serial_driver.magic = TTY_DRIVER_MAGIC;
+	serial_driver.driver_name = "serial";
+	serial_driver.name = "ttyS";
+	serial_driver.major = TTY_MAJOR;
+	serial_driver.minor_start = 64;
+	serial_driver.num = NR_PORTS;
+	serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
+	serial_driver.subtype = SERIAL_TYPE_NORMAL;
+	serial_driver.init_termios = tty_std_termios;
+	serial_driver.init_termios.c_cflag =
+		B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+	serial_driver.flags = TTY_DRIVER_REAL_RAW;
+	serial_driver.refcount = &serial_refcount;
+	serial_driver.table = serial_table;
+	serial_driver.termios = serial_termios;
+	serial_driver.termios_locked = serial_termios_locked;
+
+	serial_driver.open = rs_open;
+	serial_driver.close = rs_close;
+	serial_driver.write = rs_write;
+	serial_driver.put_char = rs_put_char;
+	serial_driver.flush_chars = rs_flush_chars;
+	serial_driver.write_room = rs_write_room;
+	serial_driver.chars_in_buffer = rs_chars_in_buffer;
+	serial_driver.flush_buffer = rs_flush_buffer;
+	serial_driver.ioctl = rs_ioctl;
+	serial_driver.throttle = rs_throttle;
+	serial_driver.unthrottle = rs_unthrottle;
+	serial_driver.send_xchar = rs_send_xchar;
+	serial_driver.set_termios = rs_set_termios;
+	serial_driver.stop = rs_stop;
+	serial_driver.start = rs_start;
+	serial_driver.hangup = rs_hangup;
+	serial_driver.break_ctl = rs_break;
+	serial_driver.wait_until_sent = rs_wait_until_sent;
+	serial_driver.read_proc = rs_read_proc;
+	
+	/*
+	 * The callout device is just like normal device except for
+	 * major number and the subtype code.
+	 */
+	callout_driver = serial_driver;
+	callout_driver.name = "cua";
+	callout_driver.major = TTYAUX_MAJOR;
+	callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+	callout_driver.read_proc = 0;
+	callout_driver.proc_entry = 0;
+
+	if (tty_register_driver(&serial_driver))
+		panic("Couldn't register serial driver\n");
+	if (tty_register_driver(&callout_driver))
+		panic("Couldn't register callout driver\n");
+	
+	for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
+		state->magic = SSTATE_MAGIC;
+		state->line = i;
+		state->type = PORT_UNKNOWN;
+		state->custom_divisor = 0;
+		state->close_delay = 5*HZ/10;
+		state->closing_wait = 30*HZ;
+		state->callout_termios = callout_driver.init_termios;
+		state->normal_termios = serial_driver.init_termios;
+		state->icount.cts = state->icount.dsr = 
+			state->icount.rng = state->icount.dcd = 0;
+		state->icount.rx = state->icount.tx = 0;
+		state->icount.frame = state->icount.parity = 0;
+		state->icount.overrun = state->icount.brk = 0;
+		state->irq = irq_cannonicalize(state->irq);
+		if (check_region(state->port,8))
+			continue;
+	        if (state->flags & ASYNC_BOOT_AUTOCONF)
+ 			autoconfig(state);
+	}
+
+	/*
+	 * Detect the IRQ only once every port is initialised,
+	 * because some 16450 do not reset to 0 the MCR register.
+	 */
+	for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
+		if (state->type == PORT_UNKNOWN)
+			continue;
+		printk(KERN_INFO "ttyS%02d%s at 0x%04x (irq = %d) is a %s\n",
+		       state->line,
+		       (state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
+		       state->port, state->irq,
+		       uart_config[state->type].name);
+	}
+	return 0;
+}
+
+/*
+ * register_serial and unregister_serial allows for serial ports to be
+ * configured at run-time, to support PCMCIA modems.
+ */
+int register_serial(struct serial_struct *req)
+{
+	int i;
+	unsigned long flags;
+	struct serial_state *state;
+
+	save_flags(flags);
+	cli();
+	for (i = 0; i < NR_PORTS; i++) {
+		if (rs_table[i].port == req->port)
+			break;
+	}
+	if (i == NR_PORTS) {
+		for (i = 0; i < NR_PORTS; i++)
+			if ((rs_table[i].type == PORT_UNKNOWN) &&
+			    (rs_table[i].count == 0))
+				break;
+	}
+	if (i == NR_PORTS) {
+		restore_flags(flags);
+		return -1;
+	}
+	state = &rs_table[i];
+	if (rs_table[i].count) {
+		restore_flags(flags);
+		printk("Couldn't configure serial #%d (port=%d,irq=%d): "
+		       "device already open\n", i, req->port, req->irq);
+		return -1;
+	}
+	state->irq = req->irq;
+	state->port = req->port;
+	state->flags = req->flags;
+
+	autoconfig(state);
+	if (state->type == PORT_UNKNOWN) {
+		restore_flags(flags);
+		printk("register_serial(): autoconfig failed\n");
+		return -1;
+	}
+	restore_flags(flags);
+
+	printk(KERN_INFO "tty%02d at 0x%04x (irq = %d) is a %s\n",
+	       state->line, state->port, state->irq,
+	       uart_config[state->type].name);
+	return state->line;
+}
+
+void unregister_serial(int line)
+{
+	unsigned long flags;
+	struct serial_state *state = &rs_table[line];
+
+	save_flags(flags);
+	cli();
+	if (state->info && state->info->tty)
+		tty_hangup(state->info->tty);
+	state->type = PORT_UNKNOWN;
+	printk(KERN_INFO "tty%02d unloaded\n", state->line);
+	restore_flags(flags);
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	return rs_init();
+}
+
+void cleanup_module(void) 
+{
+	unsigned long flags;
+	int e1, e2;
+	int i;
+
+	printk("Unloading %s: version %s\n", serial_name, serial_version); 
+	save_flags(flags);
+	cli();
+
+	timer_active &= ~(1 << RS_TIMER);
+	timer_table[RS_TIMER].fn = NULL;
+	timer_table[RS_TIMER].expires = 0;
+        remove_bh(SERIAL_BH);
+
+	if ((e1 = tty_unregister_driver(&serial_driver)))
+		printk("SERIAL: failed to unregister serial driver (%d)\n",
+		       e1);
+	if ((e2 = tty_unregister_driver(&callout_driver)))
+		printk("SERIAL: failed to unregister callout driver (%d)\n", 
+		       e2);
+	restore_flags(flags);
+
+	for (i = 0; i < NR_PORTS; i++) {
+		if (rs_table[i].type != PORT_UNKNOWN)
+			release_region(rs_table[i].port, 8);
+	}
+	if (tmp_buf) {
+		free_page((unsigned long) tmp_buf);
+		tmp_buf = NULL;
+	}
+}
+#endif /* MODULE */
+
+
+/*
+ * ------------------------------------------------------------
+ * Serial console driver
+ * ------------------------------------------------------------
+ */
+#ifdef CONFIG_SERIAL_CONSOLE
+
+#define BOTH_EMPTY (VAC_UART_STATUS_TX_EMPTY | VAC_UART_STATUS_TX_EMPTY)
+
+/*
+ *	Wait for transmitter & holding register to empty
+ */
+static inline void wait_for_xmitr(struct async_struct *info)
+{
+	int lsr;
+	unsigned int tmout = 1000000;
+
+	do {
+		lsr = serial_inp(info, VAC_UART_INT_STATUS);
+		if (--tmout == 0) break;
+	} while ((lsr & BOTH_EMPTY) != BOTH_EMPTY);
+}
+
+/*
+ *	Print a string to the serial port trying not to disturb
+ *	any possible real use of the port...
+ */
+static void serial_console_write(struct console *co, const char *s,
+				unsigned count)
+{
+	struct serial_state *ser;
+	int ier;
+	unsigned i;
+	struct async_struct scr_info; /* serial_{in,out} because HUB6 */
+
+	ser = rs_table + co->index;
+	scr_info.magic = SERIAL_MAGIC;
+	scr_info.port = ser->port;
+	scr_info.flags = ser->flags;
+
+	/*
+	 *	First save the IER then disable the interrupts
+	 */
+	ier = serial_inp(&scr_info, VAC_UART_INT_MASK);
+	serial_outw(&scr_info, VAC_UART_INT_MASK, 0x00);
+
+	/*
+	 *	Now, do each character
+	 */
+	for (i = 0; i < count; i++, s++) {
+		wait_for_xmitr(&scr_info);
+
+		/*
+		 *	Send the character out.
+		 *	If a LF, also do CR...
+		 */
+		serial_outp(&scr_info, VAC_UART_TX, (unsigned short)*s << 8);
+		if (*s == 10) {
+			wait_for_xmitr(&scr_info);
+			serial_outp(&scr_info, VAC_UART_TX, 13 << 8);
+		}
+	}
+
+	/*
+	 *	Finally, Wait for transmitter & holding register to empty
+	 * 	and restore the IER
+	 */
+	wait_for_xmitr(&scr_info);
+	serial_outp(&scr_info, VAC_UART_INT_MASK, ier);
+}
+
+/*
+ *	Receive character from the serial port
+ */
+static int serial_console_wait_key(struct console *co)
+{
+	struct serial_state *ser;
+	int ier;
+	int lsr;
+	int c;
+	struct async_struct scr_info; /* serial_{in,out} because HUB6 */
+
+	ser = rs_table + co->index;
+	scr_info.magic = SERIAL_MAGIC;
+	scr_info.port = ser->port;
+	scr_info.flags = ser->flags;
+
+	/*
+	 *	First save the IER then disable the interrupts so
+	 *	that the real driver for the port does not get the
+	 *	character.
+	 */
+	ier = serial_inp(&scr_info, VAC_UART_INT_MASK);
+	serial_outp(&scr_info, VAC_UART_INT_MASK, 0x00);
+
+	do {
+		lsr = serial_inp(&scr_info, VAC_UART_INT_STATUS);
+	} while (!(lsr & VAC_UART_STATUS_RX_READY));
+	c = serial_inp(&scr_info, VAC_UART_RX);
+
+	/*
+	 *	Restore the interrupts
+	 */
+	serial_outp(&scr_info, VAC_UART_INT_MASK, ier);
+
+	return c;
+}
+
+static kdev_t serial_console_device(struct console *c)
+{
+	return MKDEV(TTY_MAJOR, 64 + c->index);
+}
+
+/*
+ *	Setup initial baud/bits/parity. We do two things here:
+ *	- construct a cflag setting for the first rs_open()
+ *	- initialize the serial port
+ *	Return non-zero if we didn't find a serial port.
+ */
+__initfunc(static int serial_console_setup(struct console *co, char *options))
+{
+	struct serial_state *ser;
+	unsigned cval;
+	int	baud = 9600;
+	int	bits = 8;
+	int	parity = 'n';
+	int	cflag = CREAD | HUPCL | CLOCAL;
+	int	quot = 0;
+	char	*s;
+	struct async_struct scr_info; /* serial_{in,out} because HUB6 */
+
+	if (options) {
+		baud = simple_strtoul(options, NULL, 10);
+		s = options;
+		while(*s >= '0' && *s <= '9')
+			s++;
+		if (*s) parity = *s++;
+		if (*s) bits   = *s - '0';
+	}
+
+	/*
+	 *	Now construct a cflag setting.
+	 */
+	switch(baud) {
+		case 1200:
+			cflag |= B1200;
+			break;
+		case 2400:
+			cflag |= B2400;
+			break;
+		case 4800:
+			cflag |= B4800;
+			break;
+		case 19200:
+			cflag |= B19200;
+			break;
+		case 38400:
+			cflag |= B38400;
+			break;
+		case 57600:
+			cflag |= B57600;
+			break;
+		case 115200:
+			cflag |= B115200;
+			break;
+		case 9600:
+		default:
+			cflag |= B9600;
+			break;
+	}
+	switch(bits) {
+		case 7:
+			cflag |= CS7;
+			break;
+		default:
+		case 8:
+			cflag |= CS8;
+			break;
+	}
+	switch(parity) {
+		case 'o': case 'O':
+			cflag |= PARODD;
+			break;
+		case 'e': case 'E':
+			cflag |= PARENB;
+			break;
+	}
+	co->cflag = cflag;
+
+	/*
+	 *	Divisor, bytesize and parity
+	 */
+	ser = rs_table + co->index;
+	scr_info.magic = SERIAL_MAGIC;
+	scr_info.port = ser->port;
+	scr_info.flags = ser->flags;
+
+	quot = ser->baud_base / baud;
+	cval = cflag & (CSIZE | CSTOPB);
+
+	cval >>= 4;
+
+	cval &= ~VAC_UART_MODE_PARITY_ENABLE;
+	if (cflag & PARENB)
+		cval |= VAC_UART_MODE_PARITY_ENABLE;
+	if (cflag & PARODD)
+		cval |= VAC_UART_MODE_PARITY_ODD;
+
+	/*
+	 *	Disable UART interrupts, set DTR and RTS high
+	 *	and set speed.
+	 */
+	switch (baud) {
+	default:
+	case 9600:
+		cval |= VAC_UART_MODE_BAUD(7);
+		break;
+	case 4800:
+		cval |= VAC_UART_MODE_BAUD(6);
+		break;
+	case 2400:
+		cval |= VAC_UART_MODE_BAUD(5);
+		break;
+	case 1200:
+		cval |= VAC_UART_MODE_BAUD(4);
+		break;
+	case 600:
+		cval |= VAC_UART_MODE_BAUD(3);
+		break;
+	case 300:
+		cval |= VAC_UART_MODE_BAUD(2);
+		break;
+#ifndef QUAD_UART_SPEED
+	case 150:
+#else
+	case 38400:
+#endif
+		cval |= VAC_UART_MODE_BAUD(1);
+		break;
+#ifndef QUAD_UART_SPEED
+	case 75:
+#else
+	case 19200:
+#endif
+		cval |= VAC_UART_MODE_BAUD(0);
+		break;
+	}
+
+	/* Baget VAC need some adjustments for computed value */
+	cval = vac_uart_mode_fixup(cval);
+
+        serial_outp(&scr_info, VAC_UART_MODE, cval);  
+	serial_outp(&scr_info, VAC_UART_INT_MASK, 0);
+
+	return 0;
+}
+
+static struct console sercons = {
+	"ttyS",
+	serial_console_write,
+	NULL,
+	serial_console_device,
+	serial_console_wait_key,
+	NULL,
+	serial_console_setup,
+	CON_PRINTBUFFER,
+	-1,
+	0,
+	NULL
+};
+
+/*
+ *	Register console.
+ */
+__initfunc (long serial_console_init(long kmem_start, long kmem_end))
+{
+	register_console(&sercons);
+	return kmem_start;
+}
+#endif
+
+#ifdef CONFIG_REMOTE_DEBUG
+#undef PRINT_DEBUG_PORT_INFO
+
+/*
+ * This is the interface to the remote debugger stub.
+ * I've put that here to be able to control the serial
+ * device more directly.
+ */
+
+static int initialized = 0;
+
+static int rs_debug_init(struct async_struct *info)
+{
+	int quot;
+
+	autoconfig(info);	/* autoconfigure ttyS0, whatever that is */
+
+#ifdef PRINT_DEBUG_PORT_INFO
+	baget_printk("kgdb debug interface:: tty%02d at 0x%04x", 
+		     info->line, info->port);
+	switch (info->type) {
+		case PORT_8250:
+			baget_printk(" is a 8250\n");
+			break;
+		case PORT_16450:
+			baget_printk(" is a 16450\n");
+			break;
+		case PORT_16550:
+			baget_printk(" is a 16550\n");
+			break;
+		case PORT_16550A:
+			baget_printk(" is a 16550A\n");
+			break;
+		case PORT_16650:
+			baget_printk(" is a 16650\n");
+			break;
+		default:
+			baget_printk(" is of unknown type -- unusable\n");
+			break;
+	}
+#endif
+	
+	if (info->port == PORT_UNKNOWN)
+		return -1;
+
+	/*
+	 * Clear all interrupts
+	 */
+
+	(void)serial_inp(info, VAC_UART_INT_STATUS);
+	(void)serial_inp(info, VAC_UART_RX);
+
+	/*
+	 * Now, initialize the UART 
+	 */
+	serial_outp(info,VAC_UART_MODE,VAC_UART_MODE_INITIAL); /* reset DLAB */
+	if (info->flags & ASYNC_FOURPORT) {
+		info->MCR = UART_MCR_DTR | UART_MCR_RTS;
+		info->MCR_noint = UART_MCR_DTR | UART_MCR_OUT1;
+	} else {
+		info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
+		info->MCR_noint = UART_MCR_DTR | UART_MCR_RTS;
+	}
+
+	info->MCR = info->MCR_noint;	     /* no interrupts, please */
+	/*
+	 * and set the speed of the serial port
+	 * (currently hardwired to 9600 8N1
+	 */
+
+	quot = info->baud_base / 9600;	     /* baud rate is fixed to 9600 */
+	/* FIXME: if rs_debug interface is needed, we need to set speed here */
+
+	return 0;
+}
+
+int putDebugChar(char c)
+{
+	struct async_struct *info = rs_table;
+
+	if (!initialized) { 		/* need to init device first */
+		if (rs_debug_init(info) == 0)
+			initialized = 1;
+		else
+			return 0;
+	}
+
+	while ((serial_inw(info, VAC_UART_INT_STATUS) & \
+                VAC_UART_STATUS_TX_EMPTY) == 0)
+		;
+	serial_out(info, VAC_UART_TX, (unsigned short)c << 8);
+
+	return 1;
+}
+
+char getDebugChar(void)
+{
+	struct async_struct *info = rs_table;
+
+	if (!initialized) { 		/* need to init device first */
+		if (rs_debug_init(info) == 0)
+			initialized = 1;
+		else
+			return 0;
+	}
+	while (!(serial_inw(info, VAC_UART_INT_STATUS) & \
+		 VAC_UART_STATUS_RX_READY))
+		;
+
+	return(serial_inp(info, VAC_UART_RX));
+}
+
+#endif /* CONFIG_REMOTE_DEBUG */