Linux-2.6.12-rc2v2.6.12-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, 1883 insertions, 0 deletions

diff --git a/drivers/serial/mcfserial.c b/drivers/serial/mcfserial.c
new file mode 100644
index 00000000000..8c40167778d
--- /dev/null
+++ b/drivers/serial/mcfserial.c
@@ -0,0 +1,1883 @@
+/*
+ * mcfserial.c -- serial driver for ColdFire internal UARTS.
+ *
+ * Copyright (C) 1999-2003 Greg Ungerer <gerg@snapgear.com>
+ * Copyright (c) 2000-2001 Lineo, Inc. <www.lineo.com> 
+ * Copyright (C) 2001-2002 SnapGear Inc. <www.snapgear.com> 
+ *
+ * Based on code from 68332serial.c which was:
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1998 TSHG
+ * Copyright (c) 1999 Rt-Control Inc. <jeff@uclinux.org>
+ *
+ * Changes:
+ * 08/07/2003    Daniele Bellucci <bellucda@tiscali.it>
+ *               some cleanups in mcfrs_write.
+ *
+ */
+ 
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/wait.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/semaphore.h>
+#include <asm/delay.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/mcfuart.h>
+#include <asm/nettel.h>
+#include <asm/uaccess.h>
+#include "mcfserial.h"
+
+struct timer_list mcfrs_timer_struct;
+
+/*
+ *	Default console baud rate,  we use this as the default
+ *	for all ports so init can just open /dev/console and
+ *	keep going.  Perhaps one day the cflag settings for the
+ *	console can be used instead.
+ */
+#if defined(CONFIG_ARNEWSH) || defined(CONFIG_MOTOROLA) || defined(CONFIG_senTec) || defined(CONFIG_SNEHA)
+#define	CONSOLE_BAUD_RATE	19200
+#define	DEFAULT_CBAUD		B19200
+#endif
+
+#if defined(CONFIG_HW_FEITH)
+  #define	CONSOLE_BAUD_RATE	38400
+  #define	DEFAULT_CBAUD		B38400
+#endif
+
+#ifndef CONSOLE_BAUD_RATE
+#define	CONSOLE_BAUD_RATE	9600
+#define	DEFAULT_CBAUD		B9600
+#endif
+
+int mcfrs_console_inited = 0;
+int mcfrs_console_port = -1;
+int mcfrs_console_baud = CONSOLE_BAUD_RATE;
+int mcfrs_console_cbaud = DEFAULT_CBAUD;
+
+/*
+ *	Driver data structures.
+ */
+static struct tty_driver *mcfrs_serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/* Debugging...
+ */
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+
+#if defined(CONFIG_M527x) || defined(CONFIG_M528x)
+#define	IRQBASE	(MCFINT_VECBASE+MCFINT_UART0)
+#else
+#define	IRQBASE	73
+#endif
+
+/*
+ *	Configuration table, UARTs to look for at startup.
+ */
+static struct mcf_serial mcfrs_table[] = {
+	{  /* ttyS0 */
+		.magic = 0,
+		.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1),
+		.irq = IRQBASE,
+		.flags = ASYNC_BOOT_AUTOCONF,
+	},
+	{  /* ttyS1 */
+		.magic = 0,
+		.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2),
+		.irq = IRQBASE+1,
+		.flags = ASYNC_BOOT_AUTOCONF,
+	},
+};
+
+
+#define	NR_PORTS	(sizeof(mcfrs_table) / sizeof(struct mcf_serial))
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts.
+ */
+static int mcfrs_baud_table[] = {
+	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+	9600, 19200, 38400, 57600, 115200, 230400, 460800, 0
+};
+#define MCFRS_BAUD_TABLE_SIZE \
+			(sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0]))
+
+
+#ifdef CONFIG_MAGIC_SYSRQ
+/*
+ *	Magic system request keys. Used for debugging...
+ */
+extern int	magic_sysrq_key(int ch);
+#endif
+
+
+/*
+ *	Forware declarations...
+ */
+static void	mcfrs_change_speed(struct mcf_serial *info);
+static void	mcfrs_wait_until_sent(struct tty_struct *tty, int timeout);
+
+
+static inline int serial_paranoia_check(struct mcf_serial *info,
+					char *name, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+	static const char badmagic[] =
+		"MCFRS(warning): bad magic number for serial struct %s in %s\n";
+	static const char badinfo[] =
+		"MCFRS(warning): null mcf_serial for %s in %s\n";
+
+	if (!info) {
+		printk(badinfo, name, routine);
+		return 1;
+	}
+	if (info->magic != SERIAL_MAGIC) {
+		printk(badmagic, name, routine);
+		return 1;
+	}
+#endif
+	return 0;
+}
+
+/*
+ *	Sets or clears DTR and RTS on the requested line.
+ */
+static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts)
+{
+	volatile unsigned char	*uartp;
+	unsigned long		flags;
+	
+#if 0
+	printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n",
+		__FILE__, __LINE__, info, dtr, rts);
+#endif
+
+	local_irq_save(flags);
+	if (dtr >= 0) {
+#ifdef MCFPP_DTR0
+		if (info->line)
+			mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1));
+		else
+			mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0));
+#endif
+	}
+	if (rts >= 0) {
+		uartp = info->addr;
+		if (rts) {
+			info->sigs |= TIOCM_RTS;
+			uartp[MCFUART_UOP1] = MCFUART_UOP_RTS;
+		} else {
+			info->sigs &= ~TIOCM_RTS;
+			uartp[MCFUART_UOP0] = MCFUART_UOP_RTS;
+		}
+	}
+	local_irq_restore(flags);
+	return;
+}
+
+/*
+ *	Gets values of serial signals.
+ */
+static int mcfrs_getsignals(struct mcf_serial *info)
+{
+	volatile unsigned char	*uartp;
+	unsigned long		flags;
+	int			sigs;
+#if defined(CONFIG_NETtel) && defined(CONFIG_M5307)
+	unsigned short		ppdata;
+#endif
+
+#if 0
+	printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__);
+#endif
+
+	local_irq_save(flags);
+	uartp = info->addr;
+	sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS;
+	sigs |= (info->sigs & TIOCM_RTS);
+
+#ifdef MCFPP_DCD0
+{
+	unsigned int ppdata;
+	ppdata = mcf_getppdata();
+	if (info->line == 0) {
+		sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD;
+		sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR;
+	} else if (info->line == 1) {
+		sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD;
+		sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR;
+	}
+}
+#endif
+
+	local_irq_restore(flags);
+	return(sigs);
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_stop() and mcfrs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void mcfrs_stop(struct tty_struct *tty)
+{
+	volatile unsigned char	*uartp;
+	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
+	unsigned long		flags;
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_stop"))
+		return;
+	
+	local_irq_save(flags);
+	uartp = info->addr;
+	info->imr &= ~MCFUART_UIR_TXREADY;
+	uartp[MCFUART_UIMR] = info->imr;
+	local_irq_restore(flags);
+}
+
+static void mcfrs_start(struct tty_struct *tty)
+{
+	volatile unsigned char	*uartp;
+	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
+	unsigned long		flags;
+	
+	if (serial_paranoia_check(info, tty->name, "mcfrs_start"))
+		return;
+
+	local_irq_save(flags);
+	if (info->xmit_cnt && info->xmit_buf) {
+		uartp = info->addr;
+		info->imr |= MCFUART_UIR_TXREADY;
+		uartp[MCFUART_UIMR] = info->imr;
+	}
+	local_irq_restore(flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines.  All of the following
+ * subroutines are declared as inline and are folded into
+ * mcfrs_interrupt().  They were separated out for readability's sake.
+ *
+ * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off.  People who may want to modify
+ * mcfrs_interrupt() should try to keep the interrupt handler as fast as
+ * possible.  After you are done making modifications, it is not a bad
+ * idea to do:
+ * 
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ * 				- Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+static inline void receive_chars(struct mcf_serial *info)
+{
+	volatile unsigned char	*uartp;
+	struct tty_struct	*tty = info->tty;
+	unsigned char		status, ch;
+
+	if (!tty)
+		return;
+
+	uartp = info->addr;
+
+	while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) {
+
+		if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+			break;
+
+		ch = uartp[MCFUART_URB];
+		info->stats.rx++;
+
+#ifdef CONFIG_MAGIC_SYSRQ
+		if (mcfrs_console_inited && (info->line == mcfrs_console_port)) {
+			if (magic_sysrq_key(ch))
+				continue;
+		}
+#endif
+
+		tty->flip.count++;
+		if (status & MCFUART_USR_RXERR) {
+			uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR;
+			if (status & MCFUART_USR_RXBREAK) {
+				info->stats.rxbreak++;
+				*tty->flip.flag_buf_ptr++ = TTY_BREAK;
+			} else if (status & MCFUART_USR_RXPARITY) {
+				info->stats.rxparity++;
+				*tty->flip.flag_buf_ptr++ = TTY_PARITY;
+			} else if (status & MCFUART_USR_RXOVERRUN) {
+				info->stats.rxoverrun++;
+				*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
+			} else if (status & MCFUART_USR_RXFRAMING) {
+				info->stats.rxframing++;
+				*tty->flip.flag_buf_ptr++ = TTY_FRAME;
+			} else {
+				/* This should never happen... */
+				*tty->flip.flag_buf_ptr++ = 0;
+			}
+		} else {
+			*tty->flip.flag_buf_ptr++ = 0;
+		}
+		*tty->flip.char_buf_ptr++ = ch;
+	}
+
+	schedule_work(&tty->flip.work);
+	return;
+}
+
+static inline void transmit_chars(struct mcf_serial *info)
+{
+	volatile unsigned char	*uartp;
+
+	uartp = info->addr;
+
+	if (info->x_char) {
+		/* Send special char - probably flow control */
+		uartp[MCFUART_UTB] = info->x_char;
+		info->x_char = 0;
+		info->stats.tx++;
+	}
+
+	if ((info->xmit_cnt <= 0) || info->tty->stopped) {
+		info->imr &= ~MCFUART_UIR_TXREADY;
+		uartp[MCFUART_UIMR] = info->imr;
+		return;
+	}
+
+	while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) {
+		uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++];
+		info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+		info->stats.tx++;
+		if (--info->xmit_cnt <= 0)
+			break;
+	}
+
+	if (info->xmit_cnt < WAKEUP_CHARS)
+		schedule_work(&info->tqueue);
+	return;
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+irqreturn_t mcfrs_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct mcf_serial	*info;
+	unsigned char		isr;
+
+	info = &mcfrs_table[(irq - IRQBASE)];
+	isr = info->addr[MCFUART_UISR] & info->imr;
+
+	if (isr & MCFUART_UIR_RXREADY)
+		receive_chars(info);
+	if (isr & MCFUART_UIR_TXREADY)
+		transmit_chars(info);
+	return IRQ_HANDLED;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+static void mcfrs_offintr(void *private)
+{
+	struct mcf_serial	*info = (struct mcf_serial *) private;
+	struct tty_struct	*tty;
+	
+	tty = info->tty;
+	if (!tty)
+		return;
+	tty_wakeup(tty);
+}
+
+
+/*
+ *	Change of state on a DCD line.
+ */
+void mcfrs_modem_change(struct mcf_serial *info, int dcd)
+{
+	if (info->count == 0)
+		return;
+
+	if (info->flags & ASYNC_CHECK_CD) {
+		if (dcd)
+			wake_up_interruptible(&info->open_wait);
+		else 
+			schedule_work(&info->tqueue_hangup);
+	}
+}
+
+
+#ifdef MCFPP_DCD0
+
+unsigned short	mcfrs_ppstatus;
+
+/*
+ * This subroutine is called when the RS_TIMER goes off. It is used
+ * to monitor the state of the DCD lines - since they have no edge
+ * sensors and interrupt generators.
+ */
+static void mcfrs_timer(void)
+{
+	unsigned int	ppstatus, dcdval, i;
+
+	ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
+
+	if (ppstatus != mcfrs_ppstatus) {
+		for (i = 0; (i < 2); i++) {
+			dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0);
+			if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) {
+				mcfrs_modem_change(&mcfrs_table[i],
+					((ppstatus & dcdval) ? 0 : 1));
+			}
+		}
+	}
+	mcfrs_ppstatus = ppstatus;
+
+	/* Re-arm timer */
+	mcfrs_timer_struct.expires = jiffies + HZ/25;
+	add_timer(&mcfrs_timer_struct);
+}
+
+#endif	/* MCFPP_DCD0 */
+
+
+/*
+ * 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() -> mcfrs_hangup()
+ * 
+ */
+static void do_serial_hangup(void *private)
+{
+	struct mcf_serial	*info = (struct mcf_serial *) private;
+	struct tty_struct	*tty;
+	
+	tty = info->tty;
+	if (!tty)
+		return;
+
+	tty_hangup(tty);
+}
+
+static int startup(struct mcf_serial * info)
+{
+	volatile unsigned char	*uartp;
+	unsigned long		flags;
+	
+	if (info->flags & ASYNC_INITIALIZED)
+		return 0;
+
+	if (!info->xmit_buf) {
+		info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
+		if (!info->xmit_buf)
+			return -ENOMEM;
+	}
+
+	local_irq_save(flags);
+
+#ifdef SERIAL_DEBUG_OPEN
+	printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
+#endif
+
+	/*
+	 *	Reset UART, get it into known state...
+	 */
+	uartp = info->addr;
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX;  /* reset RX */
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX;  /* reset TX */
+	mcfrs_setsignals(info, 1, 1);
+
+	if (info->tty)
+		clear_bit(TTY_IO_ERROR, &info->tty->flags);
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+	/*
+	 * and set the speed of the serial port
+	 */
+	mcfrs_change_speed(info);
+
+	/*
+	 * Lastly enable the UART transmitter and receiver, and
+	 * interrupt enables.
+	 */
+	info->imr = MCFUART_UIR_RXREADY;
+	uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
+	uartp[MCFUART_UIMR] = info->imr;
+
+	info->flags |= ASYNC_INITIALIZED;
+	local_irq_restore(flags);
+	return 0;
+}
+
+/*
+ * 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 mcf_serial * info)
+{
+	volatile unsigned char	*uartp;
+	unsigned long		flags;
+
+	if (!(info->flags & ASYNC_INITIALIZED))
+		return;
+
+#ifdef SERIAL_DEBUG_OPEN
+	printk("Shutting down serial port %d (irq %d)....\n", info->line,
+	       info->irq);
+#endif
+	
+	local_irq_save(flags);
+
+	uartp = info->addr;
+	uartp[MCFUART_UIMR] = 0;  /* mask all interrupts */
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX;  /* reset RX */
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX;  /* reset TX */
+
+	if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
+		mcfrs_setsignals(info, 0, 0);
+
+	if (info->xmit_buf) {
+		free_page((unsigned long) info->xmit_buf);
+		info->xmit_buf = 0;
+	}
+
+	if (info->tty)
+		set_bit(TTY_IO_ERROR, &info->tty->flags);
+	
+	info->flags &= ~ASYNC_INITIALIZED;
+	local_irq_restore(flags);
+}
+
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void mcfrs_change_speed(struct mcf_serial *info)
+{
+	volatile unsigned char	*uartp;
+	unsigned int		baudclk, cflag;
+	unsigned long		flags;
+	unsigned char		mr1, mr2;
+	int			i;
+#ifdef	CONFIG_M5272
+	unsigned int		fraction;
+#endif
+
+	if (!info->tty || !info->tty->termios)
+		return;
+	cflag = info->tty->termios->c_cflag;
+	if (info->addr == 0)
+		return;
+
+#if 0
+	printk("%s(%d): mcfrs_change_speed()\n", __FILE__, __LINE__);
+#endif
+
+	i = cflag & CBAUD;
+	if (i & CBAUDEX) {
+		i &= ~CBAUDEX;
+		if (i < 1 || i > 4)
+			info->tty->termios->c_cflag &= ~CBAUDEX;
+		else
+			i += 15;
+	}
+	if (i == 0) {
+		mcfrs_setsignals(info, 0, -1);
+		return;
+	}
+
+	/* compute the baudrate clock */
+#ifdef	CONFIG_M5272
+	/*
+	 * For the MCF5272, also compute the baudrate fraction.
+	 */
+	baudclk = (MCF_BUSCLK / mcfrs_baud_table[i]) / 32;
+	fraction = MCF_BUSCLK - (baudclk * 32 * mcfrs_baud_table[i]);
+	fraction *= 16;
+	fraction /= (32 * mcfrs_baud_table[i]);
+#else
+	baudclk = ((MCF_BUSCLK / mcfrs_baud_table[i]) + 16) / 32;
+#endif
+
+	info->baud = mcfrs_baud_table[i];
+
+	mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
+	mr2 = 0;
+
+	switch (cflag & CSIZE) {
+	case CS5:	mr1 |= MCFUART_MR1_CS5; break;
+	case CS6:	mr1 |= MCFUART_MR1_CS6; break;
+	case CS7:	mr1 |= MCFUART_MR1_CS7; break;
+	case CS8:
+	default:	mr1 |= MCFUART_MR1_CS8; break;
+	}
+
+	if (cflag & PARENB) {
+		if (cflag & CMSPAR) {
+			if (cflag & PARODD)
+				mr1 |= MCFUART_MR1_PARITYMARK;
+			else
+				mr1 |= MCFUART_MR1_PARITYSPACE;
+		} else {
+			if (cflag & PARODD)
+				mr1 |= MCFUART_MR1_PARITYODD;
+			else
+				mr1 |= MCFUART_MR1_PARITYEVEN;
+		}
+	} else {
+		mr1 |= MCFUART_MR1_PARITYNONE;
+	}
+
+	if (cflag & CSTOPB)
+		mr2 |= MCFUART_MR2_STOP2;
+	else
+		mr2 |= MCFUART_MR2_STOP1;
+
+	if (cflag & CRTSCTS) {
+		mr1 |= MCFUART_MR1_RXRTS;
+		mr2 |= MCFUART_MR2_TXCTS;
+	}
+
+	if (cflag & CLOCAL)
+		info->flags &= ~ASYNC_CHECK_CD;
+	else
+		info->flags |= ASYNC_CHECK_CD;
+
+	uartp = info->addr;
+
+	local_irq_save(flags);
+#if 0
+	printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__, __LINE__,
+		mr1, mr2, baudclk);
+#endif
+	/*
+	  Note: pg 12-16 of MCF5206e User's Manual states that a
+	  software reset should be performed prior to changing
+	  UMR1,2, UCSR, UACR, bit 7
+	*/
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX;    /* reset RX */
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX;    /* reset TX */
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR;	/* reset MR pointer */
+	uartp[MCFUART_UMR] = mr1;
+	uartp[MCFUART_UMR] = mr2;
+	uartp[MCFUART_UBG1] = (baudclk & 0xff00) >> 8;	/* set msb byte */
+	uartp[MCFUART_UBG2] = (baudclk & 0xff);		/* set lsb byte */
+#ifdef	CONFIG_M5272
+	uartp[MCFUART_UFPD] = (fraction & 0xf);		/* set fraction */
+#endif
+	uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
+	uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
+	mcfrs_setsignals(info, 1, -1);
+	local_irq_restore(flags);
+	return;
+}
+
+static void mcfrs_flush_chars(struct tty_struct *tty)
+{
+	volatile unsigned char	*uartp;
+	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
+	unsigned long		flags;
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_flush_chars"))
+		return;
+
+	uartp = (volatile unsigned char *) info->addr;
+
+	/*
+	 * re-enable receiver interrupt
+	 */
+	local_irq_save(flags);
+	if ((!(info->imr & MCFUART_UIR_RXREADY)) &&
+	    (info->flags & ASYNC_INITIALIZED) ) {
+		info->imr |= MCFUART_UIR_RXREADY;
+		uartp[MCFUART_UIMR] = info->imr;
+	}
+	local_irq_restore(flags);
+
+	if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+	    !info->xmit_buf)
+		return;
+
+	/* Enable transmitter */
+	local_irq_save(flags);
+	info->imr |= MCFUART_UIR_TXREADY;
+	uartp[MCFUART_UIMR] = info->imr;
+	local_irq_restore(flags);
+}
+
+static int mcfrs_write(struct tty_struct * tty,
+		    const unsigned char *buf, int count)
+{
+	volatile unsigned char	*uartp;
+	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
+	unsigned long		flags;
+	int			c, total = 0;
+
+#if 0
+	printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n",
+		__FILE__, __LINE__, (int)tty, (int)buf, count);
+#endif
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_write"))
+		return 0;
+
+	if (!tty || !info->xmit_buf)
+		return 0;
+	
+	local_save_flags(flags);
+	while (1) {
+		local_irq_disable();		
+		c = min(count, (int) min(((int)SERIAL_XMIT_SIZE) - info->xmit_cnt - 1,
+			((int)SERIAL_XMIT_SIZE) - info->xmit_head));
+		local_irq_restore(flags);
+
+		if (c <= 0)
+			break;
+
+		memcpy(info->xmit_buf + info->xmit_head, buf, c);
+
+		local_irq_disable();
+		info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
+		info->xmit_cnt += c;
+		local_irq_restore(flags);
+
+		buf += c;
+		count -= c;
+		total += c;
+	}
+
+	local_irq_disable();
+	uartp = info->addr;
+	info->imr |= MCFUART_UIR_TXREADY;
+	uartp[MCFUART_UIMR] = info->imr;
+	local_irq_restore(flags);
+
+	return total;
+}
+
+static int mcfrs_write_room(struct tty_struct *tty)
+{
+	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+	int	ret;
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_write_room"))
+		return 0;
+	ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+	if (ret < 0)
+		ret = 0;
+	return ret;
+}
+
+static int mcfrs_chars_in_buffer(struct tty_struct *tty)
+{
+	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_chars_in_buffer"))
+		return 0;
+	return info->xmit_cnt;
+}
+
+static void mcfrs_flush_buffer(struct tty_struct *tty)
+{
+	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
+	unsigned long		flags;
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_flush_buffer"))
+		return;
+
+	local_irq_save(flags);
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+	local_irq_restore(flags);
+
+	tty_wakeup(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_throttle()
+ * 
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void mcfrs_throttle(struct tty_struct * tty)
+{
+	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+	char	buf[64];
+	
+	printk("throttle %s: %d....\n", _tty_name(tty, buf),
+	       tty->ldisc.chars_in_buffer(tty));
+#endif
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_throttle"))
+		return;
+	
+	if (I_IXOFF(tty))
+		info->x_char = STOP_CHAR(tty);
+
+	/* Turn off RTS line (do this atomic) */
+}
+
+static void mcfrs_unthrottle(struct tty_struct * tty)
+{
+	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+	char	buf[64];
+	
+	printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
+	       tty->ldisc.chars_in_buffer(tty));
+#endif
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_unthrottle"))
+		return;
+	
+	if (I_IXOFF(tty)) {
+		if (info->x_char)
+			info->x_char = 0;
+		else
+			info->x_char = START_CHAR(tty);
+	}
+
+	/* Assert RTS line (do this atomic) */
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct mcf_serial * info,
+			   struct serial_struct * retinfo)
+{
+	struct serial_struct tmp;
+  
+	if (!retinfo)
+		return -EFAULT;
+	memset(&tmp, 0, sizeof(tmp));
+	tmp.type = info->type;
+	tmp.line = info->line;
+	tmp.port = (unsigned int) info->addr;
+	tmp.irq = info->irq;
+	tmp.flags = info->flags;
+	tmp.baud_base = info->baud_base;
+	tmp.close_delay = info->close_delay;
+	tmp.closing_wait = info->closing_wait;
+	tmp.custom_divisor = info->custom_divisor;
+	return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
+}
+
+static int set_serial_info(struct mcf_serial * info,
+			   struct serial_struct * new_info)
+{
+	struct serial_struct new_serial;
+	struct mcf_serial old_info;
+	int 	retval = 0;
+
+	if (!new_info)
+		return -EFAULT;
+	if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
+		return -EFAULT;
+	old_info = *info;
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		if ((new_serial.baud_base != info->baud_base) ||
+		    (new_serial.type != info->type) ||
+		    (new_serial.close_delay != info->close_delay) ||
+		    ((new_serial.flags & ~ASYNC_USR_MASK) !=
+		     (info->flags & ~ASYNC_USR_MASK)))
+			return -EPERM;
+		info->flags = ((info->flags & ~ASYNC_USR_MASK) |
+			       (new_serial.flags & ASYNC_USR_MASK));
+		info->custom_divisor = new_serial.custom_divisor;
+		goto check_and_exit;
+	}
+
+	if (info->count > 1)
+		return -EBUSY;
+
+	/*
+	 * OK, past this point, all the error checking has been done.
+	 * At this point, we start making changes.....
+	 */
+
+	info->baud_base = new_serial.baud_base;
+	info->flags = ((info->flags & ~ASYNC_FLAGS) |
+			(new_serial.flags & ASYNC_FLAGS));
+	info->type = new_serial.type;
+	info->close_delay = new_serial.close_delay;
+	info->closing_wait = new_serial.closing_wait;
+
+check_and_exit:
+	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 mcf_serial * info, unsigned int *value)
+{
+	volatile unsigned char	*uartp;
+	unsigned long		flags;
+	unsigned char		status;
+
+	local_irq_save(flags);
+	uartp = info->addr;
+	status = (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) ? TIOCSER_TEMT : 0;
+	local_irq_restore(flags);
+
+	return put_user(status,value);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break(	struct mcf_serial * info, int duration)
+{
+	volatile unsigned char	*uartp;
+	unsigned long		flags;
+
+	if (!info->addr)
+		return;
+	set_current_state(TASK_INTERRUPTIBLE);
+	uartp = info->addr;
+
+	local_irq_save(flags);
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTART;
+	schedule_timeout(duration);
+	uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTOP;
+	local_irq_restore(flags);
+}
+
+static int mcfrs_tiocmget(struct tty_struct *tty, struct file *file)
+{
+	struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
+		return -ENODEV;
+	if (tty->flags & (1 << TTY_IO_ERROR))
+		return -EIO;
+
+	return mcfrs_getsignals(info);
+}
+
+static int mcfrs_tiocmset(struct tty_struct *tty, struct file *file,
+			  unsigned int set, unsigned int clear)
+{
+	struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
+	int rts = -1, dtr = -1;
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
+		return -ENODEV;
+	if (tty->flags & (1 << TTY_IO_ERROR))
+		return -EIO;
+
+	if (set & TIOCM_RTS)
+		rts = 1;
+	if (set & TIOCM_DTR)
+		dtr = 1;
+	if (clear & TIOCM_RTS)
+		rts = 0;
+	if (clear & TIOCM_DTR)
+		dtr = 0;
+
+	mcfrs_setsignals(info, dtr, rts);
+
+	return 0;
+}
+
+static int mcfrs_ioctl(struct tty_struct *tty, struct file * file,
+		    unsigned int cmd, unsigned long arg)
+{
+	struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
+	int retval, error;
+
+	if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
+		return -ENODEV;
+
+	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+	    (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
+	    (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
+		if (tty->flags & (1 << TTY_IO_ERROR))
+		    return -EIO;
+	}
+	
+	switch (cmd) {
+		case TCSBRK:	/* SVID version: non-zero arg --> no break */
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+			tty_wait_until_sent(tty, 0);
+			if (!arg)
+				send_break(info, HZ/4);	/* 1/4 second */
+			return 0;
+		case TCSBRKP:	/* support for POSIX tcsendbreak() */
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+			tty_wait_until_sent(tty, 0);
+			send_break(info, arg ? arg*(HZ/10) : HZ/4);
+			return 0;
+		case TIOCGSOFTCAR:
+			error = put_user(C_CLOCAL(tty) ? 1 : 0,
+				    (unsigned long *) arg);
+			if (error)
+				return error;
+			return 0;
+		case TIOCSSOFTCAR:
+			get_user(arg, (unsigned long *) arg);
+			tty->termios->c_cflag =
+				((tty->termios->c_cflag & ~CLOCAL) |
+				 (arg ? CLOCAL : 0));
+			return 0;
+		case TIOCGSERIAL:
+			if (access_ok(VERIFY_WRITE, (void *) arg,
+						sizeof(struct serial_struct)))
+				return get_serial_info(info,
+					       (struct serial_struct *) arg);
+			return -EFAULT;
+		case TIOCSSERIAL:
+			return set_serial_info(info,
+					       (struct serial_struct *) arg);
+		case TIOCSERGETLSR: /* Get line status register */
+			if (access_ok(VERIFY_WRITE, (void *) arg,
+						sizeof(unsigned int)))
+				return get_lsr_info(info, (unsigned int *) arg);
+			return -EFAULT;
+		case TIOCSERGSTRUCT:
+			error = copy_to_user((struct mcf_serial *) arg,
+				    info, sizeof(struct mcf_serial));
+			if (error)
+				return -EFAULT;
+			return 0;
+			
+#ifdef TIOCSET422
+		case TIOCSET422: {
+			unsigned int val;
+			get_user(val, (unsigned int *) arg);
+			mcf_setpa(MCFPP_PA11, (val ? 0 : MCFPP_PA11));
+			break;
+		}
+		case TIOCGET422: {
+			unsigned int val;
+			val = (mcf_getpa() & MCFPP_PA11) ? 0 : 1;
+			put_user(val, (unsigned int *) arg);
+			break;
+		}
+#endif
+
+		default:
+			return -ENOIOCTLCMD;
+		}
+	return 0;
+}
+
+static void mcfrs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+
+	if (tty->termios->c_cflag == old_termios->c_cflag)
+		return;
+
+	mcfrs_change_speed(info);
+
+	if ((old_termios->c_cflag & CRTSCTS) &&
+	    !(tty->termios->c_cflag & CRTSCTS)) {
+		tty->hw_stopped = 0;
+		mcfrs_setsignals(info, -1, 1);
+#if 0
+		mcfrs_start(tty);
+#endif
+	}
+}
+
+/*
+ * ------------------------------------------------------------
+ * mcfrs_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
+ * S structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void mcfrs_close(struct tty_struct *tty, struct file * filp)
+{
+	volatile unsigned char	*uartp;
+	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
+	unsigned long		flags;
+
+	if (!info || serial_paranoia_check(info, tty->name, "mcfrs_close"))
+		return;
+	
+	local_irq_save(flags);
+	
+	if (tty_hung_up_p(filp)) {
+		local_irq_restore(flags);
+		return;
+	}
+	
+#ifdef SERIAL_DEBUG_OPEN
+	printk("mcfrs_close ttyS%d, count = %d\n", info->line, info->count);
+#endif
+	if ((tty->count == 1) && (info->count != 1)) {
+		/*
+		 * Uh, oh.  tty->count is 1, which means that the tty
+		 * structure will be freed.  Info->count should always
+		 * be one in these conditions.  If it's greater than
+		 * one, we've got real problems, since it means the
+		 * serial port won't be shutdown.
+		 */
+		printk("MCFRS: bad serial port count; tty->count is 1, "
+		       "info->count is %d\n", info->count);
+		info->count = 1;
+	}
+	if (--info->count < 0) {
+		printk("MCFRS: bad serial port count for ttyS%d: %d\n",
+		       info->line, info->count);
+		info->count = 0;
+	}
+	if (info->count) {
+		local_irq_restore(flags);
+		return;
+	}
+	info->flags |= ASYNC_CLOSING;
+
+	/*
+	 * Now we wait for the transmit buffer to clear; and we notif