tty: move drivers/serial/ to drivers/tty/serial/

The serial drivers are really just tty drivers, so move them to
drivers/tty/ to make things a bit neater overall.

This is part of the tty/serial driver movement proceedure as proposed by
Arnd Bergmann and approved by everyone involved a number of months ago.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rogier Wolff <R.E.Wolff@bitwizard.nl>
Cc: Michael H. Warfield <mhw@wittsend.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1472 insertions, 0 deletions

diff --git a/drivers/tty/serial/68328serial.c b/drivers/tty/serial/68328serial.c
new file mode 100644
index 000000000000..be0ebce36e54
--- /dev/null
+++ b/drivers/tty/serial/68328serial.c
@@ -0,0 +1,1472 @@
+/* 68328serial.c: Serial port driver for 68328 microcontroller
+ *
+ * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
+ * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
+ * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@uclinux.org>
+ * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
+ * Copyright (C) 2002-2003  David McCullough   <davidm@snapgear.com>
+ * Copyright (C) 2002       Greg Ungerer       <gerg@snapgear.com>
+ *
+ * VZ Support/Fixes             Evan Stawnyczy <e@lineo.ca>
+ * Multiple UART support        Daniel Potts <danielp@cse.unsw.edu.au>
+ * Power management support     Daniel Potts <danielp@cse.unsw.edu.au>
+ * VZ Second Serial Port enable Phil Wilshire
+ * 2.4/2.5 port                 David McCullough
+ */
+
+#include <asm/dbg.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/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/reboot.h>
+#include <linux/keyboard.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/delay.h>
+#include <asm/uaccess.h>
+
+/* (es) */
+/* note: perhaps we can murge these files, so that you can just
+ * 	 define 1 of them, and they can sort that out for themselves
+ */
+#if defined(CONFIG_M68EZ328)
+#include <asm/MC68EZ328.h>
+#else
+#if defined(CONFIG_M68VZ328)
+#include <asm/MC68VZ328.h>
+#else
+#include <asm/MC68328.h>
+#endif /* CONFIG_M68VZ328 */
+#endif /* CONFIG_M68EZ328 */
+
+#include "68328serial.h"
+
+/* Turn off usage of real serial interrupt code, to "support" Copilot */
+#ifdef CONFIG_XCOPILOT_BUGS
+#undef USE_INTS
+#else
+#define USE_INTS
+#endif
+
+static struct m68k_serial m68k_soft[NR_PORTS];
+
+static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
+
+/* multiple ports are contiguous in memory */
+m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
+
+struct tty_struct m68k_ttys;
+struct m68k_serial *m68k_consinfo = 0;
+
+#define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
+
+struct tty_driver *serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/* Debugging... DEBUG_INTR is bad to use when one of the zs
+ * lines is your console ;(
+ */
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+
+#define RS_ISR_PASS_LIMIT 256
+
+static void change_speed(struct m68k_serial *info);
+
+/*
+ *	Setup for console. Argument comes from the boot command line.
+ */
+
+/* note: this is messy, but it works, again, perhaps defined somewhere else?*/
+#ifdef CONFIG_M68VZ328
+#define CONSOLE_BAUD_RATE	19200
+#define DEFAULT_CBAUD		B19200
+#endif
+
+
+#ifndef CONSOLE_BAUD_RATE
+#define	CONSOLE_BAUD_RATE	9600
+#define	DEFAULT_CBAUD		B9600
+#endif
+
+
+static int m68328_console_initted = 0;
+static int m68328_console_baud    = CONSOLE_BAUD_RATE;
+static int m68328_console_cbaud   = DEFAULT_CBAUD;
+
+
+static inline int serial_paranoia_check(struct m68k_serial *info,
+					char *name, 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 m68k_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;
+}
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts
+ */
+static int baud_table[] = {
+	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+	9600, 19200, 38400, 57600, 115200, 0 };
+
+/* Sets or clears DTR/RTS on the requested line */
+static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
+{
+	if (set) {
+		/* set the RTS/CTS line */
+	} else {
+		/* clear it */
+	}
+	return;
+}
+
+/* Utility routines */
+static inline int get_baud(struct m68k_serial *ss)
+{
+	unsigned long result = 115200;
+	unsigned short int baud = uart_addr[ss->line].ubaud;
+	if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
+	result >>= GET_FIELD(baud, UBAUD_DIVIDE);
+
+	return result;
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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 m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned long flags;
+
+	if (serial_paranoia_check(info, tty->name, "rs_stop"))
+		return;
+	
+	local_irq_save(flags);
+	uart->ustcnt &= ~USTCNT_TXEN;
+	local_irq_restore(flags);
+}
+
+static int rs_put_char(char ch)
+{
+        int flags, loops = 0;
+
+        local_irq_save(flags);
+
+	while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
+        	loops++;
+        	udelay(5);
+        }
+
+	UTX_TXDATA = ch;
+        udelay(5);
+        local_irq_restore(flags);
+        return 1;
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned long flags;
+	
+	if (serial_paranoia_check(info, tty->name, "rs_start"))
+		return;
+	
+	local_irq_save(flags);
+	if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
+#ifdef USE_INTS
+		uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
+#else
+		uart->ustcnt |= USTCNT_TXEN;
+#endif
+	}
+	local_irq_restore(flags);
+}
+
+/* Drop into either the boot monitor or kadb upon receiving a break
+ * from keyboard/console input.
+ */
+static void batten_down_hatches(void)
+{
+	/* Drop into the debugger */
+}
+
+static void status_handle(struct m68k_serial *info, unsigned short status)
+{
+#if 0
+	if(status & DCD) {
+		if((info->port.tty->termios->c_cflag & CRTSCTS) &&
+		   ((info->curregs[3] & AUTO_ENAB)==0)) {
+			info->curregs[3] |= AUTO_ENAB;
+			info->pendregs[3] |= AUTO_ENAB;
+			write_zsreg(info->m68k_channel, 3, info->curregs[3]);
+		}
+	} else {
+		if((info->curregs[3] & AUTO_ENAB)) {
+			info->curregs[3] &= ~AUTO_ENAB;
+			info->pendregs[3] &= ~AUTO_ENAB;
+			write_zsreg(info->m68k_channel, 3, info->curregs[3]);
+		}
+	}
+#endif
+	/* If this is console input and this is a
+	 * 'break asserted' status change interrupt
+	 * see if we can drop into the debugger
+	 */
+	if((status & URX_BREAK) && info->break_abort)
+		batten_down_hatches();
+	return;
+}
+
+static void receive_chars(struct m68k_serial *info, unsigned short rx)
+{
+	struct tty_struct *tty = info->port.tty;
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned char ch, flag;
+
+	/*
+	 * This do { } while() loop will get ALL chars out of Rx FIFO 
+         */
+#ifndef CONFIG_XCOPILOT_BUGS
+	do {
+#endif	
+		ch = GET_FIELD(rx, URX_RXDATA);
+	
+		if(info->is_cons) {
+			if(URX_BREAK & rx) { /* whee, break received */
+				status_handle(info, rx);
+				return;
+#ifdef CONFIG_MAGIC_SYSRQ
+			} else if (ch == 0x10) { /* ^P */
+				show_state();
+				show_free_areas();
+				show_buffers();
+/*				show_net_buffers(); */
+				return;
+			} else if (ch == 0x12) { /* ^R */
+				emergency_restart();
+				return;
+#endif /* CONFIG_MAGIC_SYSRQ */
+			}
+		}
+
+		if(!tty)
+			goto clear_and_exit;
+		
+		flag = TTY_NORMAL;
+
+		if(rx & URX_PARITY_ERROR) {
+			flag = TTY_PARITY;
+			status_handle(info, rx);
+		} else if(rx & URX_OVRUN) {
+			flag = TTY_OVERRUN;
+			status_handle(info, rx);
+		} else if(rx & URX_FRAME_ERROR) {
+			flag = TTY_FRAME;
+			status_handle(info, rx);
+		}
+		tty_insert_flip_char(tty, ch, flag);
+#ifndef CONFIG_XCOPILOT_BUGS
+	} while((rx = uart->urx.w) & URX_DATA_READY);
+#endif
+
+	tty_schedule_flip(tty);
+
+clear_and_exit:
+	return;
+}
+
+static void transmit_chars(struct m68k_serial *info)
+{
+	m68328_uart *uart = &uart_addr[info->line];
+
+	if (info->x_char) {
+		/* Send next char */
+		uart->utx.b.txdata = info->x_char;
+		info->x_char = 0;
+		goto clear_and_return;
+	}
+
+	if((info->xmit_cnt <= 0) || info->port.tty->stopped) {
+		/* That's peculiar... TX ints off */
+		uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
+		goto clear_and_return;
+	}
+
+	/* Send char */
+	uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+	info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+	info->xmit_cnt--;
+
+	if (info->xmit_cnt < WAKEUP_CHARS)
+		schedule_work(&info->tqueue);
+
+	if(info->xmit_cnt <= 0) {
+		/* All done for now... TX ints off */
+		uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
+		goto clear_and_return;
+	}
+
+clear_and_return:
+	/* Clear interrupt (should be auto)*/
+	return;
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+irqreturn_t rs_interrupt(int irq, void *dev_id)
+{
+	struct m68k_serial *info = dev_id;
+	m68328_uart *uart;
+	unsigned short rx;
+	unsigned short tx;
+
+	uart = &uart_addr[info->line];
+	rx = uart->urx.w;
+
+#ifdef USE_INTS
+	tx = uart->utx.w;
+
+	if (rx & URX_DATA_READY) receive_chars(info, rx);
+	if (tx & UTX_TX_AVAIL)   transmit_chars(info);
+#else
+	receive_chars(info, rx);		
+#endif
+	return IRQ_HANDLED;
+}
+
+static void do_softint(struct work_struct *work)
+{
+	struct m68k_serial	*info = container_of(work, struct m68k_serial, tqueue);
+	struct tty_struct	*tty;
+	
+	tty = info->port.tty;
+	if (!tty)
+		return;
+#if 0
+	if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
+		tty_wakeup(tty);
+	}
+#endif   
+}
+
+/*
+ * 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() -> rs_hangup()
+ * 
+ */
+static void do_serial_hangup(struct work_struct *work)
+{
+	struct m68k_serial	*info = container_of(work, struct m68k_serial, tqueue_hangup);
+	struct tty_struct	*tty;
+	
+	tty = info->port.tty;
+	if (!tty)
+		return;
+
+	tty_hangup(tty);
+}
+
+
+static int startup(struct m68k_serial * info)
+{
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned long flags;
+	
+	if (info->flags & S_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);
+
+	/*
+	 * Clear the FIFO buffers and disable them
+	 * (they will be reenabled in change_speed())
+	 */
+
+	uart->ustcnt = USTCNT_UEN;
+	info->xmit_fifo_size = 1;
+	uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
+	(void)uart->urx.w;
+
+	/*
+	 * Finally, enable sequencing and interrupts
+	 */
+#ifdef USE_INTS
+	uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | 
+                 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
+#else
+	uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
+#endif
+
+	if (info->port.tty)
+		clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+	/*
+	 * and set the speed of the serial port
+	 */
+
+	change_speed(info);
+
+	info->flags |= S_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 m68k_serial * info)
+{
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned long	flags;
+
+	uart->ustcnt = 0; /* All off! */
+	if (!(info->flags & S_INITIALIZED))
+		return;
+
+	local_irq_save(flags);
+	
+	if (info->xmit_buf) {
+		free_page((unsigned long) info->xmit_buf);
+		info->xmit_buf = 0;
+	}
+
+	if (info->port.tty)
+		set_bit(TTY_IO_ERROR, &info->port.tty->flags);
+	
+	info->flags &= ~S_INITIALIZED;
+	local_irq_restore(flags);
+}
+
+struct {
+	int divisor, prescale;
+}
+#ifndef CONFIG_M68VZ328
+ hw_baud_table[18] = {
+	{0,0}, /* 0 */
+	{0,0}, /* 50 */
+	{0,0}, /* 75 */
+	{0,0}, /* 110 */
+	{0,0}, /* 134 */
+	{0,0}, /* 150 */
+	{0,0}, /* 200 */
+	{7,0x26}, /* 300 */
+	{6,0x26}, /* 600 */
+	{5,0x26}, /* 1200 */
+	{0,0}, /* 1800 */
+	{4,0x26}, /* 2400 */
+	{3,0x26}, /* 4800 */
+	{2,0x26}, /* 9600 */
+	{1,0x26}, /* 19200 */
+	{0,0x26}, /* 38400 */
+	{1,0x38}, /* 57600 */
+	{0,0x38}, /* 115200 */
+};
+#else
+ hw_baud_table[18] = {
+                 {0,0}, /* 0 */
+                 {0,0}, /* 50 */
+                 {0,0}, /* 75 */
+                 {0,0}, /* 110 */
+                 {0,0}, /* 134 */
+                 {0,0}, /* 150 */
+                 {0,0}, /* 200 */
+                 {0,0}, /* 300 */
+                 {7,0x26}, /* 600 */
+                 {6,0x26}, /* 1200 */
+                 {0,0}, /* 1800 */
+                 {5,0x26}, /* 2400 */
+                 {4,0x26}, /* 4800 */
+                 {3,0x26}, /* 9600 */
+                 {2,0x26}, /* 19200 */
+                 {1,0x26}, /* 38400 */
+                 {0,0x26}, /* 57600 */
+                 {1,0x38}, /* 115200 */
+}; 
+#endif
+/* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
+
+/*
+ * 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 m68k_serial *info)
+{
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned short port;
+	unsigned short ustcnt;
+	unsigned cflag;
+	int	i;
+
+	if (!info->port.tty || !info->port.tty->termios)
+		return;
+	cflag = info->port.tty->termios->c_cflag;
+	if (!(port = info->port))
+		return;
+
+	ustcnt = uart->ustcnt;
+	uart->ustcnt = ustcnt & ~USTCNT_TXEN;
+
+	i = cflag & CBAUD;
+        if (i & CBAUDEX) {
+                i = (i & ~CBAUDEX) + B38400;
+        }
+
+	info->baud = baud_table[i];
+	uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) | 
+		PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
+
+	ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
+	
+	if ((cflag & CSIZE) == CS8)
+		ustcnt |= USTCNT_8_7;
+		
+	if (cflag & CSTOPB)
+		ustcnt |= USTCNT_STOP;
+
+	if (cflag & PARENB)
+		ustcnt |= USTCNT_PARITYEN;
+	if (cflag & PARODD)
+		ustcnt |= USTCNT_ODD_EVEN;
+	
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+	if (cflag & CRTSCTS) {
+		uart->utx.w &= ~ UTX_NOCTS;
+	} else {
+		uart->utx.w |= UTX_NOCTS;
+	}
+#endif
+
+	ustcnt |= USTCNT_TXEN;
+	
+	uart->ustcnt = ustcnt;
+	return;
+}
+
+/*
+ * Fair output driver allows a process to speak.
+ */
+static void rs_fair_output(void)
+{
+	int left;		/* Output no more than that */
+	unsigned long flags;
+	struct m68k_serial *info = &m68k_soft[0];
+	char c;
+
+	if (info == 0) return;
+	if (info->xmit_buf == 0) return;
+
+	local_irq_save(flags);
+	left = info->xmit_cnt;
+	while (left != 0) {
+		c = info->xmit_buf[info->xmit_tail];
+		info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
+		info->xmit_cnt--;
+		local_irq_restore(flags);
+
+		rs_put_char(c);
+
+		local_irq_save(flags);
+		left = min(info->xmit_cnt, left-1);
+	}
+
+	/* Last character is being transmitted now (hopefully). */
+	udelay(5);
+
+	local_irq_restore(flags);
+	return;
+}
+
+/*
+ * m68k_console_print is registered for printk.
+ */
+void console_print_68328(const char *p)
+{
+	char c;
+	
+	while((c=*(p++)) != 0) {
+		if(c == '\n')
+			rs_put_char('\r');
+		rs_put_char(c);
+	}
+
+	/* Comment this if you want to have a strict interrupt-driven output */
+	rs_fair_output();
+
+	return;
+}
+
+static void rs_set_ldisc(struct tty_struct *tty)
+{
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+	if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
+		return;
+
+	info->is_cons = (tty->termios->c_line == N_TTY);
+	
+	printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned long flags;
+
+	if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
+		return;
+#ifndef USE_INTS
+	for(;;) {
+#endif
+
+	/* Enable transmitter */
+	local_irq_save(flags);
+
+	if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+			!info->xmit_buf) {
+		local_irq_restore(flags);
+		return;
+	}
+
+#ifdef USE_INTS
+	uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
+#else
+	uart->ustcnt |= USTCNT_TXEN;
+#endif
+
+#ifdef USE_INTS
+	if (uart->utx.w & UTX_TX_AVAIL) {
+#else
+	if (1) {
+#endif
+		/* Send char */
+		uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+		info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+		info->xmit_cnt--;
+	}
+
+#ifndef USE_INTS
+	while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
+	}
+#endif
+	local_irq_restore(flags);
+}
+
+extern void console_printn(const char * b, int count);
+
+static int rs_write(struct tty_struct * tty,
+		    const unsigned char *buf, int count)
+{
+	int	c, total = 0;
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned long flags;
+
+	if (serial_paranoia_check(info, tty->name, "rs_write"))
+		return 0;
+
+	if (!tty || !info->xmit_buf)
+		return 0;
+
+	local_save_flags(flags);
+	while (1) {
+		local_irq_disable();		
+		c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+				   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;
+	}
+
+	if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
+		/* Enable transmitter */
+		local_irq_disable();		
+#ifndef USE_INTS
+		while(info->xmit_cnt) {
+#endif
+
+		uart->ustcnt |= USTCNT_TXEN;
+#ifdef USE_INTS
+		uart->ustcnt |= USTCNT_TX_INTR_MASK;
+#else
+		while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
+#endif
+		if (uart->utx.w & UTX_TX_AVAIL) {
+			uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+			info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+			info->xmit_cnt--;
+		}
+
+#ifndef USE_INTS
+		}
+#endif
+		local_irq_restore(flags);
+	}
+
+	return total;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+	int	ret;
+				
+	if (serial_paranoia_check(info, tty->name, "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 m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+				
+	if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
+		return 0;
+	return info->xmit_cnt;
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+	unsigned long flags;
+				
+	if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
+		return;
+	local_irq_save(flags);
+	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+	local_irq_restore(flags);
+	tty_wakeup(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ * 
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_throttle(struct tty_struct * tty)
+{
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+	if (serial_paranoia_check(info, tty->name, "rs_throttle"))
+		return;
+	
+	if (I_IXOFF(tty))
+		info->x_char = STOP_CHAR(tty);
+
+	/* Turn off RTS line (do this atomic) */
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+	if (serial_paranoia_check(info, tty->name, "rs_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) */
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct m68k_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 = info->port;
+	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;
+	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int set_serial_info(struct m68k_serial * info,
+			   struct serial_struct * new_info)
+{
+	struct serial_struct new_serial;
+	struct m68k_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 & ~S_USR_MASK) !=
+		     (info->flags & ~S_USR_MASK)))
+			return -EPERM;
+		info->flags = ((info->flags & ~S_USR_MASK) |
+			       (new_serial.flags & S_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 & ~S_FLAGS) |
+			(new_serial.flags & S_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 m68k_serial * info, unsigned int *value)
+{
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+	m68328_uart *uart = &uart_addr[info->line];
+#endif
+	unsigned char status;
+	unsigned long flags;
+
+	local_irq_save(flags);
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+	status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
+#else
+	status = 0;
+#endif
+	local_irq_restore(flags);
+	return put_user(status, value);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break(struct m68k_serial * info, unsigned int duration)
+{
+	m68328_uart *uart = &uart_addr[info->line];
+        unsigned long flags;
+        if (!info->port)
+                return;
+        local_irq_save(flags);
+#ifdef USE_INTS	
+	uart->utx.w |= UTX_SEND_BREAK;
+	msleep_interruptible(duration);
+	uart->utx.w &= ~UTX_SEND_BREAK;
+#endif		
+        local_irq_restore(flags);
+}
+
+static int rs_ioctl(struct tty_struct *tty, struct file * file,
+		    unsigned int cmd, unsigned long arg)
+{
+	int error;
+	struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+	int retval;
+
+	if (serial_paranoia_check(info, tty->name, "rs_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, 250);	/* 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*(100) : 250);
+			return 0;
+		case TIOCGSERIAL:
+			return get_serial_info(info,
+				       (struct serial_struct *) arg);
+		case TIOCSSERIAL:
+			return set_serial_info(info,
+					       (struct serial_struct *) arg);
+		case TIOCSERGETLSR: /* Get line status register */
+			return get_lsr_info(info, (unsigned int *) arg);
+		case TIOCSERGSTRUCT:
+			if (copy_to_user((struct m68k_serial *) arg,
+				    info, sizeof(struct m68k_serial)))
+				return -EFAULT;
+			return 0;
+		default:
+			return -ENOIOCTLCMD;
+		}
+	return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+	change_speed(info);
+
+	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
+ * S 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 m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+	m68328_uart *uart = &uart_addr[info->line];
+	unsigned long flags;
+
+	if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
+		return;
+	
+	local_irq_save(flags);
+	
+	if (tty_hung_up_p(filp)) {
+		local_irq_restore(flags);
+		return;
+	}
+	
+	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("rs_close: bad serial port count; tty->count is 1, "
+		       "info->count is %d\n", info->count);
+		info->count = 1;
+	}
+	if (--info->count < 0) {
+		printk("rs_close: 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 |= S_CLOSING;
+	/*
+	 * 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 != S_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.
+	 */
+
+	uart->ustcnt &= ~USTCNT_RXEN;
+	uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
+
+	shutdown(info);
+	rs_flush_buffer(tty);
+		
+	tty_ldisc_flush(tty);
+	tty->closing = 0;
+	info->event = 0;
+	info->port.tty = NULL;
+#warning "This is not and has never been valid so fix it"	
+#if 0
+	if (tty->ldisc.num != ldiscs[N_TTY].num) {
+		if (tty->ldisc.close)
+			(tty->ldisc.close)(tty);
+		tty->ldisc = ldiscs[N_TTY];
+		tty->termios->c_line = N_TTY;
+		if (tty->ldisc.open)
+			(tty->ldisc.open)(tty);
+	}
+#endif	
+	if (info->blocked_open) {
+		if (info->close_delay) {
+			msleep_interruptible(jiffies_to_msecs(info->close_delay));
+		}
+		wake_up_interruptible(&info->open_wait);
+	}
+	info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
+	wake_up_interruptible(&info->close_wait);
+	local_irq_restore(flags);
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+void rs_hangup(struct tty_struct *tty)
+{
+	struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+	
+	if (serial_paranoia_check(info, tty->name, "rs_hangup"))
+		return;
+	
+	rs_flush_buffer(tty);
+	shutdown(info);
+	info->event = 0;
+	info->count = 0;
+	info->flags &= ~S_NORMAL_ACTIVE;
+	info->port.tty = NULL;
+	wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+			   struct m68k_serial *info)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	int		retval;
+	int		do_clocal = 0;
+
+	/*
+	 * If the device is in the middle of being closed, then block
+	 * until it's done, and then try again.
+	 */
+	if (info->flags & S_CLOSING) {
+		interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+		if (info->flags & S_HUP_NOTIFY)
+			return -EAGAIN;
+		else
+			return -ERESTARTSYS;
+#else
+		return -EAGAIN;
+#endif
+	}
+	
+	/*
+	 * If non-blocking mode is set, or the port is not enabled,
+	 * then make the check up front and then exit.
+	 */
+	if ((filp->f_flags & O_NONBLOCK) ||
+	    (tty->flags & (1 << TTY_IO_ERROR))) {
+		info->flags |= S_NORMAL_ACTIVE;
+		return 0;
+	}
+
+	if (tty->termios->c_cflag & CLOCAL)
+		do_clocal = 1;
+
+	/*
+	 * Block waiting for the carrier detect and the line to become
+	 * free (i.e., not in use by the callout).  While we are in
+	 * this loop, info->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);
+
+	info->count--;
+	info->blocked_open++;
+	while (1) {
+		local_irq_disable();
+		m68k_rtsdtr(info, 1);
+		local_irq_enable();
+		current->state = TASK_INTERRUPTIBLE;
+		if (tty_hung_up_p(filp) ||
+		    !(info->flags & S_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+			if (info->flags & S_HUP_NOTIFY)
+				retval = -EAGAIN;
+			else
+				retval = -ERESTARTSYS;	
+#else
+			retval = -EAGAIN;
+#endif
+			break;
+		}
+		if (!(info->flags & S_CLOSING) && do_clocal)
+			break;
+                if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+		tty_unlock();
+		schedule();
+		tty_lock();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&info->open_wait, &wait);
+	if (!tty_hung_up_p(filp))
+		info->count++;
+	info->blocked_open--;
+
+	if (retval)
+		return retval;
+	info->flags |= S_NORMAL_ACTIVE;
+	return 0;
+}	
+
+/*
+ * This routine is called whenever a serial port is opened.  It
+ * enables interrupts for a serial port, linking in its S structure into
+ * the IRQ chain.   It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+int rs_open(struct tty_struct *tty, struct file * filp)
+{
+	struct m68k_serial	*info;
+	int 			retval, line;
+
+	line = tty->index;
+	
+	if (line >= NR_PORTS || line < 0) /* we have exactly one */
+		return -ENODEV;
+
+	info = &m68k_soft[line];
+
+	if (serial_paranoia_check(info, tty->name, "rs_open"))
+		return -ENODEV;
+
+	info->count++;
+	tty->driver_data = info;
+	info->port.tty = tty;
+
+	/*
+	 * Start up serial port
+	 */
+	retval = startup(info);
+	if (retval)
+		return retval;
+
+	return block_til_ready(tty, filp, info);
+}
+
+/* Finally, routines used to initialize the serial driver. */
+
+static void show_serial_version(void)
+{
+	printk("MC68328 serial driver version 1.00\n");
+}
+
+static const struct tty_operations rs_ops = {
+	.open = rs_open,
+	.close = rs_close,
+	.write = rs_write,
+	.flush_chars = rs_flush_chars,
+	.write_room = rs_write_room,
+	.chars_in_buffer = rs_chars_in_buffer,
+	.flush_buffer = rs_flush_buffer,
+	.ioctl = rs_ioctl,
+	.throttle = rs_throttle,
+	.unthrottle = rs_unthrottle,
+	.set_termios = rs_set_termios,
+	.stop = rs_stop,
+	.start = rs_start,
+	.hangup = rs_hangup,
+	.set_ldisc = rs_set_ldisc,
+};
+
+/* rs_init inits the driver */
+static int __init
+rs68328_init(void)
+{
+	int flags, i;
+	struct m68k_serial *info;
+
+	serial_driver = alloc_tty_driver(NR_PORTS);
+	if (!serial_driver)
+		return -ENOMEM;
+
+	show_serial_version();
+
+	/* Initialize the tty_driver structure */
+	/* SPARC: Not all of this is exactly right for us. */
+	
+	serial_driver->name = "ttyS";
+	serial_driver->major = TTY_MAJOR;
+	serial_driver->minor_start = 64;
+	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 = 
+			m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
+	serial_driver->flags = TTY_DRIVER_REAL_RAW;
+	tty_set_operations(serial_driver, &rs_ops);
+
+	if (tty_register_driver(serial_driver)) {
+		put_tty_driver(serial_driver);
+		printk(KERN_ERR "Couldn't register serial driver\n");
+		return -ENOMEM;
+	}
+
+	local_irq_save(flags);
+
+	for(i=0;i<NR_PORTS;i++) {
+
+	    info = &m68k_soft[i];
+	    info->magic = SERIAL_MAGIC;
+	    info->port = (int) &uart_addr[i];
+	    info->port.tty = NULL;
+	    info->irq = uart_irqs[i];
+	    info->custom_divisor = 16;
+	    info->close_delay = 50;
+	    info->closing_wait = 3000;
+	    info->x_char = 0;
+	    info->event = 0;
+	    info->count = 0;
+	    info->blocked_open = 0;
+	    INIT_WORK(&info->tqueue, do_softint);
+	    INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
+	    init_waitqueue_head(&info->open_wait);
+	    init_waitqueue_head(&info->close_wait);
+	    info->line = i;
+	    info->is_cons = 1; /* Means shortcuts work */
+	    
+	    printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, 
+		   info->port, info->irq);
+	    printk(" is a builtin MC68328 UART\n");
+	    
+#ifdef CONFIG_M68VZ328
+		if (i > 0 )
+			PJSEL &= 0xCF;  /* PSW enable second port output */
+#endif
+
+	    if (request_irq(uart_irqs[i],
+			    rs_interrupt,
+			    IRQF_DISABLED,
+			    "M68328_UART", info))
+                panic("Unable to attach 68328 serial interrupt\n");
+	}
+	local_irq_restore(flags);
+	return 0;
+}
+
+module_init(rs68328_init);
+
+
+
+static void m68328_set_baud(void)
+{
+	unsigned short ustcnt;
+	int	i;
+
+	ustcnt = USTCNT;
+	USTCNT = ustcnt & ~USTCNT_TXEN;
+
+again:
+	for (i = 0; i < ARRAY_SIZE(baud_table); i++)
+		if (baud_table[i] == m68328_console_baud)
+			break;
+	if (i >= ARRAY_SIZE(baud_table)) {
+		m68328_console_baud = 9600;
+		goto again;
+	}
+
+	UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) | 
+		PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
+	ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
+	ustcnt |= USTCNT_8_7;
+	ustcnt |= USTCNT_TXEN;
+	USTCNT = ustcnt;
+	m68328_console_initted = 1;
+	return;
+}
+
+
+int m68328_console_setup(struct console *cp, char *arg)
+{
+	int		i, n = CONSOLE_BAUD_RATE;
+
+	if (!cp)
+		return(-1);
+
+	if (arg)
+		n = simple_strtoul(arg,NULL,0);
+
+	for (i = 0; i < ARRAY_SIZE(baud_table); i++)
+		if (baud_table[i] == n)
+			break;
+	if (i < ARRAY_SIZE(baud_table)) {
+		m68328_console_baud = n;
+		m68328_console_cbaud = 0;
+		if (i > 15) {
+			m68328_console_cbaud |= CBAUDEX;
+			i -= 15;
+		}
+		m68328_console_cbaud |= i;
+	}
+
+	m68328_set_baud(); /* make sure baud rate changes */
+	return(0);
+}
+
+
+static struct tty_driver *m68328_console_device(struct console *c, int *index)
+{
+	*index = c->index;
+	return serial_driver;
+}
+
+
+void m68328_console_write (struct console *co, const char *str,
+			   unsigned int count)
+{
+	if (!m68328_console_initted)
+		m68328_set_baud();
+    while (count--) {
+        if (*str == '\n')
+           rs_put_char('\r');
+        rs_put_char( *str++ );
+    }
+}
+
+
+static struct console m68328_driver = {
+	.name		= "ttyS",
+	.write		= m68328_console_write,
+	.device		= m68328_console_device,
+	.setup		= m68328_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+};
+
+
+static int __init m68328_console_init(void)
+{
+	register_console(&m68328_driver);
+	return 0;
+}
+
+console_initcall(m68328_console_init);