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, 1312 insertions, 0 deletions

diff --git a/drivers/serial/au1x00_uart.c b/drivers/serial/au1x00_uart.c
new file mode 100644
index 00000000000..b6d3d503494
--- /dev/null
+++ b/drivers/serial/au1x00_uart.c
@@ -0,0 +1,1312 @@
+/*
+ *  Driver for 8250/16550-type serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright (C) 2001 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * A note about mapbase / membase
+ *
+ *  mapbase is the physical address of the IO port.  Currently, we don't
+ *  support this very well, and it may well be dropped from this driver
+ *  in future.  As such, mapbase should be NULL.
+ *
+ *  membase is an 'ioremapped' cookie.  This is compatible with the old
+ *  serial.c driver, and is currently the preferred form.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/delay.h>
+
+#include <asm/serial.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach-au1x00/au1000.h>
+
+#if defined(CONFIG_SERIAL_AU1X00_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+#include "8250.h"
+
+/*
+ * Debugging.
+ */
+#if 0
+#define DEBUG_AUTOCONF(fmt...)	printk(fmt)
+#else
+#define DEBUG_AUTOCONF(fmt...)	do { } while (0)
+#endif
+
+#if 0
+#define DEBUG_INTR(fmt...)	printk(fmt)
+#else
+#define DEBUG_INTR(fmt...)	do { } while (0)
+#endif
+
+#define PASS_LIMIT	256
+
+/*
+ * We default to IRQ0 for the "no irq" hack.   Some
+ * machine types want others as well - they're free
+ * to redefine this in their header file.
+ */
+#define is_real_interrupt(irq)	((irq) != 0)
+
+static struct old_serial_port old_serial_port[] = {
+	{	.baud_base = 0,
+		.iomem_base = (u8 *)UART0_ADDR,
+		.irq = AU1000_UART0_INT,
+		.flags = STD_COM_FLAGS,
+		.iomem_reg_shift = 2,
+	}, {
+		.baud_base = 0,
+		.iomem_base = (u8 *)UART1_ADDR,
+		.irq = AU1000_UART1_INT,
+		.flags = STD_COM_FLAGS,
+		.iomem_reg_shift = 2
+	}, {
+		.baud_base = 0,
+		.iomem_base = (u8 *)UART2_ADDR,
+		.irq = AU1000_UART2_INT,
+		.flags = STD_COM_FLAGS,
+		.iomem_reg_shift = 2
+	}, {
+		.baud_base = 0,
+		.iomem_base = (u8 *)UART3_ADDR,
+		.irq = AU1000_UART3_INT,
+		.flags = STD_COM_FLAGS,
+		.iomem_reg_shift = 2
+	}
+};
+
+#define UART_NR	ARRAY_SIZE(old_serial_port)
+
+struct uart_8250_port {
+	struct uart_port	port;
+	struct timer_list	timer;		/* "no irq" timer */
+	struct list_head	list;		/* ports on this IRQ */
+	unsigned short		rev;
+	unsigned char		acr;
+	unsigned char		ier;
+	unsigned char		lcr;
+	unsigned char		mcr_mask;	/* mask of user bits */
+	unsigned char		mcr_force;	/* mask of forced bits */
+	unsigned char		lsr_break_flag;
+
+	/*
+	 * We provide a per-port pm hook.
+	 */
+	void			(*pm)(struct uart_port *port,
+				      unsigned int state, unsigned int old);
+};
+
+struct irq_info {
+	spinlock_t		lock;
+	struct list_head	*head;
+};
+
+static struct irq_info irq_lists[NR_IRQS];
+
+/*
+ * Here we define the default xmit fifo size used for each type of UART.
+ */
+static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
+	{ "unknown",	1,	0 },
+	{ "8250",	1,	0 },
+	{ "16450",	1,	0 },
+	{ "16550",	1,	0 },
+	/* PORT_16550A */
+	{ "AU1X00_UART",16,	UART_CLEAR_FIFO | UART_USE_FIFO },
+};
+
+static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
+{
+	return au_readl((unsigned long)up->port.membase + offset);
+}
+
+static _INLINE_ void
+serial_out(struct uart_8250_port *up, int offset, int value)
+{
+	au_writel(value, (unsigned long)up->port.membase + offset);
+}
+
+#define serial_inp(up, offset)		serial_in(up, offset)
+#define serial_outp(up, offset, value)	serial_out(up, offset, value)
+
+/*
+ * 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.
+ */
+static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
+{
+	unsigned char save_lcr, save_mcr;
+	unsigned long flags;
+
+	if (!up->port.iobase && !up->port.mapbase && !up->port.membase)
+		return;
+
+	DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04x, 0x%08lx): ",
+			up->port.line, up->port.iobase, up->port.membase);
+
+	/*
+	 * We really do need global IRQs disabled here - we're going to
+	 * be frobbing the chips IRQ enable register to see if it exists.
+	 */
+	spin_lock_irqsave(&up->port.lock, flags);
+//	save_flags(flags); cli();
+
+	save_mcr = serial_in(up, UART_MCR);
+	save_lcr = serial_in(up, UART_LCR);
+
+	up->port.type = PORT_16550A;
+	serial_outp(up, UART_LCR, save_lcr);
+
+	up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
+
+	if (up->port.type == PORT_UNKNOWN)
+		goto out;
+
+	/*
+	 * Reset the UART.
+	 */
+	serial_outp(up, UART_MCR, save_mcr);
+	serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
+				     UART_FCR_CLEAR_RCVR |
+				     UART_FCR_CLEAR_XMIT));
+	serial_outp(up, UART_FCR, 0);
+	(void)serial_in(up, UART_RX);
+	serial_outp(up, UART_IER, 0);
+
+ out:	
+	spin_unlock_irqrestore(&up->port.lock, flags);
+//	restore_flags(flags);
+	DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name);
+}
+
+static void serial8250_stop_tx(struct uart_port *port, unsigned int tty_stop)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+
+	if (up->ier & UART_IER_THRI) {
+		up->ier &= ~UART_IER_THRI;
+		serial_out(up, UART_IER, up->ier);
+	}
+}
+
+static void serial8250_start_tx(struct uart_port *port, unsigned int tty_start)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+
+	if (!(up->ier & UART_IER_THRI)) {
+		up->ier |= UART_IER_THRI;
+		serial_out(up, UART_IER, up->ier);
+	}
+}
+
+static void serial8250_stop_rx(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+
+	up->ier &= ~UART_IER_RLSI;
+	up->port.read_status_mask &= ~UART_LSR_DR;
+	serial_out(up, UART_IER, up->ier);
+}
+
+static void serial8250_enable_ms(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+
+	up->ier |= UART_IER_MSI;
+	serial_out(up, UART_IER, up->ier);
+}
+
+static _INLINE_ void
+receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs)
+{
+	struct tty_struct *tty = up->port.info->tty;
+	unsigned char ch;
+	int max_count = 256;
+
+	do {
+		if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
+			tty->flip.work.func((void *)tty);
+			if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+				return; // if TTY_DONT_FLIP is set
+		}
+		ch = serial_inp(up, UART_RX);
+		*tty->flip.char_buf_ptr = ch;
+		*tty->flip.flag_buf_ptr = TTY_NORMAL;
+		up->port.icount.rx++;
+
+		if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+				       UART_LSR_FE | UART_LSR_OE))) {
+			/*
+			 * For statistics only
+			 */
+			if (*status & UART_LSR_BI) {
+				*status &= ~(UART_LSR_FE | UART_LSR_PE);
+				up->port.icount.brk++;
+				/*
+				 * We do the SysRQ and SAK checking
+				 * here because otherwise the break
+				 * may get masked by ignore_status_mask
+				 * or read_status_mask.
+				 */
+				if (uart_handle_break(&up->port))
+					goto ignore_char;
+			} else if (*status & UART_LSR_PE)
+				up->port.icount.parity++;
+			else if (*status & UART_LSR_FE)
+				up->port.icount.frame++;
+			if (*status & UART_LSR_OE)
+				up->port.icount.overrun++;
+
+			/*
+			 * Mask off conditions which should be ingored.
+			 */
+			*status &= up->port.read_status_mask;
+
+#ifdef CONFIG_SERIAL_AU1X00_CONSOLE
+			if (up->port.line == up->port.cons->index) {
+				/* Recover the break flag from console xmit */
+				*status |= up->lsr_break_flag;
+				up->lsr_break_flag = 0;
+			}
+#endif
+			if (*status & UART_LSR_BI) {
+				DEBUG_INTR("handling break....");
+				*tty->flip.flag_buf_ptr = TTY_BREAK;
+			} else if (*status & UART_LSR_PE)
+				*tty->flip.flag_buf_ptr = TTY_PARITY;
+			else if (*status & UART_LSR_FE)
+				*tty->flip.flag_buf_ptr = TTY_FRAME;
+		}
+		if (uart_handle_sysrq_char(&up->port, ch, regs))
+			goto ignore_char;
+		if ((*status & up->port.ignore_status_mask) == 0) {
+			tty->flip.flag_buf_ptr++;
+			tty->flip.char_buf_ptr++;
+			tty->flip.count++;
+		}
+		if ((*status & UART_LSR_OE) &&
+		    tty->flip.count < TTY_FLIPBUF_SIZE) {
+			/*
+			 * Overrun is special, since it's reported
+			 * immediately, and doesn't affect the current
+			 * character.
+			 */
+			*tty->flip.flag_buf_ptr = TTY_OVERRUN;
+			tty->flip.flag_buf_ptr++;
+			tty->flip.char_buf_ptr++;
+			tty->flip.count++;
+		}
+	ignore_char:
+		*status = serial_inp(up, UART_LSR);
+	} while ((*status & UART_LSR_DR) && (max_count-- > 0));
+	spin_unlock(&up->port.lock);
+	tty_flip_buffer_push(tty);
+	spin_lock(&up->port.lock);
+}
+
+static _INLINE_ void transmit_chars(struct uart_8250_port *up)
+{
+	struct circ_buf *xmit = &up->port.info->xmit;
+	int count;
+
+	if (up->port.x_char) {
+		serial_outp(up, UART_TX, up->port.x_char);
+		up->port.icount.tx++;
+		up->port.x_char = 0;
+		return;
+	}
+	if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+		serial8250_stop_tx(&up->port, 0);
+		return;
+	}
+
+	count = up->port.fifosize;
+	do {
+		serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		up->port.icount.tx++;
+		if (uart_circ_empty(xmit))
+			break;
+	} while (--count > 0);
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&up->port);
+
+	DEBUG_INTR("THRE...");
+
+	if (uart_circ_empty(xmit))
+		serial8250_stop_tx(&up->port, 0);
+}
+
+static _INLINE_ void check_modem_status(struct uart_8250_port *up)
+{
+	int status;
+
+	status = serial_in(up, UART_MSR);
+
+	if ((status & UART_MSR_ANY_DELTA) == 0)
+		return;
+
+	if (status & UART_MSR_TERI)
+		up->port.icount.rng++;
+	if (status & UART_MSR_DDSR)
+		up->port.icount.dsr++;
+	if (status & UART_MSR_DDCD)
+		uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
+	if (status & UART_MSR_DCTS)
+		uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
+
+	wake_up_interruptible(&up->port.info->delta_msr_wait);
+}
+
+/*
+ * This handles the interrupt from one port.
+ */
+static inline void
+serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs)
+{
+	unsigned int status = serial_inp(up, UART_LSR);
+
+	DEBUG_INTR("status = %x...", status);
+
+	if (status & UART_LSR_DR)
+		receive_chars(up, &status, regs);
+	check_modem_status(up);
+	if (status & UART_LSR_THRE)
+		transmit_chars(up);
+}
+
+/*
+ * This is the serial driver's interrupt routine.
+ *
+ * Arjan thinks the old way was overly complex, so it got simplified.
+ * Alan disagrees, saying that need the complexity to handle the weird
+ * nature of ISA shared interrupts.  (This is a special exception.)
+ *
+ * In order to handle ISA shared interrupts properly, we need to check
+ * that all ports have been serviced, and therefore the ISA interrupt
+ * line has been de-asserted.
+ *
+ * This means we need to loop through all ports. checking that they
+ * don't have an interrupt pending.
+ */
+static irqreturn_t serial8250_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct irq_info *i = dev_id;
+	struct list_head *l, *end = NULL;
+	int pass_counter = 0;
+
+	DEBUG_INTR("serial8250_interrupt(%d)...", irq);
+
+	spin_lock(&i->lock);
+
+	l = i->head;
+	do {
+		struct uart_8250_port *up;
+		unsigned int iir;
+
+		up = list_entry(l, struct uart_8250_port, list);
+
+		iir = serial_in(up, UART_IIR);
+		if (!(iir & UART_IIR_NO_INT)) {
+			spin_lock(&up->port.lock);
+			serial8250_handle_port(up, regs);
+			spin_unlock(&up->port.lock);
+
+			end = NULL;
+		} else if (end == NULL)
+			end = l;
+
+		l = l->next;
+
+		if (l == i->head && pass_counter++ > PASS_LIMIT) {
+			/* If we hit this, we're dead. */
+			printk(KERN_ERR "serial8250: too much work for "
+				"irq%d\n", irq);
+			break;
+		}
+	} while (l != end);
+
+	spin_unlock(&i->lock);
+
+	DEBUG_INTR("end.\n");
+	/* FIXME! Was it really ours? */
+	return IRQ_HANDLED;
+}
+
+/*
+ * To support ISA shared interrupts, we need to have one interrupt
+ * handler that ensures that the IRQ line has been deasserted
+ * before returning.  Failing to do this will result in the IRQ
+ * line being stuck active, and, since ISA irqs are edge triggered,
+ * no more IRQs will be seen.
+ */
+static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
+{
+	spin_lock_irq(&i->lock);
+
+	if (!list_empty(i->head)) {
+		if (i->head == &up->list)
+			i->head = i->head->next;
+		list_del(&up->list);
+	} else {
+		BUG_ON(i->head != &up->list);
+		i->head = NULL;
+	}
+
+	spin_unlock_irq(&i->lock);
+}
+
+static int serial_link_irq_chain(struct uart_8250_port *up)
+{
+	struct irq_info *i = irq_lists + up->port.irq;
+	int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? SA_SHIRQ : 0;
+
+	spin_lock_irq(&i->lock);
+
+	if (i->head) {
+		list_add(&up->list, i->head);
+		spin_unlock_irq(&i->lock);
+
+		ret = 0;
+	} else {
+		INIT_LIST_HEAD(&up->list);
+		i->head = &up->list;
+		spin_unlock_irq(&i->lock);
+
+		ret = request_irq(up->port.irq, serial8250_interrupt,
+				  irq_flags, "serial", i);
+		if (ret < 0)
+			serial_do_unlink(i, up);
+	}
+
+	return ret;
+}
+
+static void serial_unlink_irq_chain(struct uart_8250_port *up)
+{
+	struct irq_info *i = irq_lists + up->port.irq;
+
+	BUG_ON(i->head == NULL);
+
+	if (list_empty(i->head))
+		free_irq(up->port.irq, i);
+
+	serial_do_unlink(i, up);
+}
+
+/*
+ * This function is used to handle ports that do not have an
+ * interrupt.  This doesn't work very well for 16450's, but gives
+ * barely passable results for a 16550A.  (Although at the expense
+ * of much CPU overhead).
+ */
+static void serial8250_timeout(unsigned long data)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)data;
+	unsigned int timeout;
+	unsigned int iir;
+
+	iir = serial_in(up, UART_IIR);
+	if (!(iir & UART_IIR_NO_INT)) {
+		spin_lock(&up->port.lock);
+		serial8250_handle_port(up, NULL);
+		spin_unlock(&up->port.lock);
+	}
+
+	timeout = up->port.timeout;
+	timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
+	mod_timer(&up->timer, jiffies + timeout);
+}
+
+static unsigned int serial8250_tx_empty(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned long flags;
+	unsigned int ret;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	return ret;
+}
+
+static unsigned int serial8250_get_mctrl(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned long flags;
+	unsigned char status;
+	unsigned int ret;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	status = serial_in(up, UART_MSR);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	ret = 0;
+	if (status & UART_MSR_DCD)
+		ret |= TIOCM_CAR;
+	if (status & UART_MSR_RI)
+		ret |= TIOCM_RNG;
+	if (status & UART_MSR_DSR)
+		ret |= TIOCM_DSR;
+	if (status & UART_MSR_CTS)
+		ret |= TIOCM_CTS;
+	return ret;
+}
+
+static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned char mcr = 0;
+
+	if (mctrl & TIOCM_RTS)
+		mcr |= UART_MCR_RTS;
+	if (mctrl & TIOCM_DTR)
+		mcr |= UART_MCR_DTR;
+	if (mctrl & TIOCM_OUT1)
+		mcr |= UART_MCR_OUT1;
+	if (mctrl & TIOCM_OUT2)
+		mcr |= UART_MCR_OUT2;
+	if (mctrl & TIOCM_LOOP)
+		mcr |= UART_MCR_LOOP;
+
+	mcr = (mcr & up->mcr_mask) | up->mcr_force;
+
+	serial_out(up, UART_MCR, mcr);
+}
+
+static void serial8250_break_ctl(struct uart_port *port, int break_state)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned long flags;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	if (break_state == -1)
+		up->lcr |= UART_LCR_SBC;
+	else
+		up->lcr &= ~UART_LCR_SBC;
+	serial_out(up, UART_LCR, up->lcr);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static int serial8250_startup(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned long flags;
+	int retval;
+
+	/*
+	 * Clear the FIFO buffers and disable them.
+	 * (they will be reeanbled in set_termios())
+	 */
+	if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
+		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+		serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+				UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+		serial_outp(up, UART_FCR, 0);
+	}
+
+	/*
+	 * Clear the interrupt registers.
+	 */
+	(void) serial_inp(up, UART_LSR);
+	(void) serial_inp(up, UART_RX);
+	(void) serial_inp(up, UART_IIR);
+	(void) serial_inp(up, UART_MSR);
+
+	/*
+	 * At this point, there's no way the LSR could still be 0xff;
+	 * if it is, then bail out, because there's likely no UART
+	 * here.
+	 */
+	if (!(up->port.flags & UPF_BUGGY_UART) &&
+	    (serial_inp(up, UART_LSR) == 0xff)) {
+		printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
+		return -ENODEV;
+	}
+
+	retval = serial_link_irq_chain(up);
+		if (retval)
+			return retval;
+
+	/*
+	 * Now, initialize the UART
+	 */
+	serial_outp(up, UART_LCR, UART_LCR_WLEN8);
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	if (up->port.flags & UPF_FOURPORT) {
+		if (!is_real_interrupt(up->port.irq))
+			up->port.mctrl |= TIOCM_OUT1;
+	} else
+		/*
+		 * Most PC uarts need OUT2 raised to enable interrupts.
+		 */
+		if (is_real_interrupt(up->port.irq))
+			up->port.mctrl |= TIOCM_OUT2;
+
+	serial8250_set_mctrl(&up->port, up->port.mctrl);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	/*
+	 * Finally, enable interrupts.  Note: Modem status interrupts
+	 * are set via set_termios(), which will be occurring imminently
+	 * anyway, so we don't enable them here.
+	 */
+	up->ier = UART_IER_RLSI | UART_IER_RDI;
+	serial_outp(up, UART_IER, up->ier);
+
+	if (up->port.flags & UPF_FOURPORT) {
+		unsigned int icp;
+		/*
+		 * Enable interrupts on the AST Fourport board
+		 */
+		icp = (up->port.iobase & 0xfe0) | 0x01f;
+		outb_p(0x80, icp);
+		(void) inb_p(icp);
+	}
+
+	/*
+	 * And clear the interrupt registers again for luck.
+	 */
+	(void) serial_inp(up, UART_LSR);
+	(void) serial_inp(up, UART_RX);
+	(void) serial_inp(up, UART_IIR);
+	(void) serial_inp(up, UART_MSR);
+
+	return 0;
+}
+
+static void serial8250_shutdown(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned long flags;
+
+	/*
+	 * Disable interrupts from this port
+	 */
+	up->ier = 0;
+	serial_outp(up, UART_IER, 0);
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	if (up->port.flags & UPF_FOURPORT) {
+		/* reset interrupts on the AST Fourport board */
+		inb((up->port.iobase & 0xfe0) | 0x1f);
+		up->port.mctrl |= TIOCM_OUT1;
+	} else
+		up->port.mctrl &= ~TIOCM_OUT2;
+
+	serial8250_set_mctrl(&up->port, up->port.mctrl);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	/*
+	 * Disable break condition and FIFOs
+	 */
+	serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
+	serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+				  UART_FCR_CLEAR_RCVR |
+				  UART_FCR_CLEAR_XMIT);
+	serial_outp(up, UART_FCR, 0);
+
+	/*
+	 * Read data port to reset things, and then unlink from
+	 * the IRQ chain.
+	 */
+	(void) serial_in(up, UART_RX);
+
+	if (!is_real_interrupt(up->port.irq))
+		del_timer_sync(&up->timer);
+	else
+		serial_unlink_irq_chain(up);
+}
+
+static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud)
+{
+	unsigned int quot;
+
+	/*
+	 * Handle magic divisors for baud rates above baud_base on
+	 * SMSC SuperIO chips.
+	 */
+	if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
+	    baud == (port->uartclk/4))
+		quot = 0x8001;
+	else if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
+		 baud == (port->uartclk/8))
+		quot = 0x8002;
+	else
+		quot = uart_get_divisor(port, baud);
+
+	return quot;
+}
+
+static void
+serial8250_set_termios(struct uart_port *port, struct termios *termios,
+		       struct termios *old)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned char cval, fcr = 0;
+	unsigned long flags;
+	unsigned int baud, quot;
+
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		cval = 0x00;
+		break;
+	case CS6:
+		cval = 0x01;
+		break;
+	case CS7:
+		cval = 0x02;
+		break;
+	default:
+	case CS8:
+		cval = 0x03;
+		break;
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		cval |= 0x04;
+	if (termios->c_cflag & PARENB)
+		cval |= UART_LCR_PARITY;
+	if (!(termios->c_cflag & PARODD))
+		cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+	if (termios->c_cflag & CMSPAR)
+		cval |= UART_LCR_SPAR;
+#endif
+
+	/*
+	 * Ask the core to calculate the divisor for us.
+	 */
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	quot = serial8250_get_divisor(port, baud);
+	quot = 0x35; /* FIXME */
+
+	/*
+	 * Work around a bug in the Oxford Semiconductor 952 rev B
+	 * chip which causes it to seriously miscalculate baud rates
+	 * when DLL is 0.
+	 */
+	if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
+	    up->rev == 0x5201)
+		quot ++;
+
+	if (uart_config[up->port.type].flags & UART_USE_FIFO) {
+		if (baud < 2400)
+			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIGGER_1;
+		else
+			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIGGER_8;
+	}
+
+	/*
+	 * Ok, we're now changing the port state.  Do it with
+	 * interrupts disabled.
+	 */
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	/*
+	 * Update the per-port timeout.
+	 */
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+	if (termios->c_iflag & INPCK)
+		up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+	if (termios->c_iflag & (BRKINT | PARMRK))
+		up->port.read_status_mask |= UART_LSR_BI;
+
+	/*
+	 * Characteres to ignore
+	 */
+	up->port.ignore_status_mask = 0;
+	if (termios->c_iflag & IGNPAR)
+		up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+	if (termios->c_iflag & IGNBRK) {
+		up->port.ignore_status_mask |= UART_LSR_BI;
+		/*
+		 * If we're ignoring parity and break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (termios->c_iflag & IGNPAR)
+			up->port.ignore_status_mask |= UART_LSR_OE;
+	}
+
+	/*
+	 * ignore all characters if CREAD is not set
+	 */
+	if ((termios->c_cflag & CREAD) == 0)
+		up->port.ignore_status_mask |= UART_LSR_DR;
+
+	/*
+	 * CTS flow control flag and modem status interrupts
+	 */
+	up->ier &= ~UART_IER_MSI;
+	if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+		up->ier |= UART_IER_MSI;
+
+	serial_out(up, UART_IER, up->ier);
+	serial_outp(up, 0x28, quot & 0xffff);
+	up->lcr = cval;					/* Save LCR */
+	if (up->port.type != PORT_16750) {
+		if (fcr & UART_FCR_ENABLE_FIFO) {
+			/* emulated UARTs (Lucent Venus 167x) need two steps */
+			serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+		}
+		serial_outp(up, UART_FCR, fcr);		/* set fcr */
+	}
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+serial8250_pm(struct uart_port *port, unsigned int state,
+	      unsigned int oldstate)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	if (state) {
+		/* sleep */
+		if (up->pm)
+			up->pm(port, state, oldstate);
+	} else {
+		/* wake */
+		if (up->pm)
+			up->pm(port, state, oldstate);
+	}
+}
+
+/*
+ * Resource handling.  This is complicated by the fact that resources
+ * depend on the port type.  Maybe we should be claiming the standard
+ * 8250 ports, and then trying to get other resources as necessary?
+ */
+static int
+serial8250_request_std_resource(struct uart_8250_port *up, struct resource **res)
+{
+	unsigned int size = 8 << up->port.regshift;
+	int ret = 0;
+
+	switch (up->port.iotype) {
+	case SERIAL_IO_MEM:
+		if (up->port.mapbase) {
+			*res = request_mem_region(up->port.mapbase, size, "serial");
+			if (!*res)
+				ret = -EBUSY;
+		}
+		break;
+
+	case SERIAL_IO_HUB6:
+	case SERIAL_IO_PORT:
+		*res = request_region(up->port.iobase, size, "serial");
+		if (!*res)
+			ret = -EBUSY;
+		break;
+	}
+	return ret;
+}
+
+
+static void serial8250_release_port(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	unsigned long start, offset = 0, size = 0;
+
+	size <<= up->port.regshift;
+
+	switch (up->port.iotype) {
+	case SERIAL_IO_MEM:
+		if (up->port.mapbase) {
+			/*
+			 * Unmap the area.
+			 */
+			iounmap(up->port.membase);
+			up->port.membase = NULL;
+
+			start = up->port.mapbase;
+
+			if (size)
+				release_mem_region(start + offset, size);
+			release_mem_region(start, 8 << up->port.regshift);
+		}
+		break;
+
+	case SERIAL_IO_HUB6:
+	case SERIAL_IO_PORT:
+		start = up->port.iobase;
+
+		if (size)
+			release_region(start + offset, size);
+		release_region(start + offset, 8 << up->port.regshift);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static int serial8250_request_port(struct uart_port *port)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	struct resource *res = NULL, *res_rsa = NULL;
+	int ret = 0;
+
+	ret = serial8250_request_std_resource(up, &res);
+
+	/*
+	 * If we have a mapbase, then request that as well.
+	 */
+	if (ret == 0 && up->port.flags & UPF_IOREMAP) {
+		int size = res->end - res->start + 1;
+
+		up->port.membase = ioremap(up->port.mapbase, size);
+		if (!up->port.membase)
+			ret = -ENOMEM;
+	}
+
+	if (ret < 0) {
+		if (res_rsa)
+			release_resource(res_rsa);
+		if (res)
+			release_resource(res);
+	}
+	return ret;
+}
+
+static void serial8250_config_port(struct uart_port *port, int flags)
+{
+	struct uart_8250_port *up = (struct uart_8250_port *)port;
+	struct resource *res_std = NULL, *res_rsa = NULL;
+	int probeflags = PROBE_ANY;
+
+	probeflags &= ~PROBE_RSA;
+
+	if (flags & UART_CONFIG_TYPE)
+		autoconfig(up, probeflags);
+
+	/*
+	 * If the port wasn't an RSA port, release the resource.
+	 */
+	if (up->port.type != PORT_RSA && res_rsa)
+		release_resource(res_rsa);
+
+	if (up->port.type == PORT_UNKNOWN && res_std)
+		release_resource(res_std);
+}
+
+static int
+serial8250_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	if (ser->irq >= NR_IRQS || ser->irq < 0 ||
+	    ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
+	    ser->type > PORT_MAX_8250 || ser->type == PORT_CIRRUS ||
+	    ser->type == PORT_STARTECH)
+		return -EINVAL;
+	return 0;
+}
+
+static const char *
+serial8250_type(struct uart_port *port)
+{
+	int type = port->type;
+
+	if (type >= ARRAY_SIZE(uart_config))
+		type = 0;
+	return uart_config[type].name;
+}
+
+static struct uart_ops serial8250_pops = {
+	.tx_empty	= serial8250_tx_empty,
+	.set_mctrl	= serial8250_set_mctrl,
+	.get_mctrl	= serial8250_get_mctrl,
+	.stop_tx	= serial8250_stop_tx,
+	.start_tx	= serial8250_start_tx,
+	.stop_rx	= serial8250_stop_rx,
+	.enable_ms	= serial8250_enable_ms,
+	.break_ctl	= serial8250_break_ctl,
+	.startup	= serial8250_startup,
+	.shutdown	= serial8250_shutdown,
+	.set_termios	= serial8250_set_termios,
+	.pm		= serial8250_pm,
+	.type		= serial8250_type,
+	.release_port	= serial8250_release_port,
+	.request_port	= serial8250_request_port,
+	.config_port	= serial8250_config_port,
+	.verify_port	= serial8250_verify_port,
+};
+
+static struct uart_8250_port serial8250_ports[UART_NR];
+
+static void __init serial8250_isa_init_ports(void)
+{
+	struct uart_8250_port *up;
+	static int first = 1;
+	int i;
+
+	if (!first)
+		return;
+	first = 0;
+
+	for (i = 0, up = serial8250_ports; i < ARRAY_SIZE(old_serial_port);
+	     i++, up++) {
+		up->port.iobase   = old_serial_port[i].port;
+		up->port.irq      = old_serial_port[i].irq;
+		up->port.uartclk  = get_au1x00_uart_baud_base();
+		up->port.flags    = old_serial_port[i].flags;
+		up->port.hub6     = old_serial_port[i].hub6;
+		up->port.membase  = old_serial_port[i].iomem_base;
+		up->port.iotype   = old_serial_port[i].io_type;
+		up->port.regshift = old_serial_port[i].iomem_reg_shift;
+		up->port.ops      = &serial8250_pops;
+	}
+}
+
+static void __init serial8250_register_ports(struct uart_driver *drv)
+{
+	int i;
+
+	serial8250_isa_init_ports();
+
+	for (i = 0; i < UART_NR; i++) {
+		struct uart_8250_port *up = &serial8250_ports[i];
+
+		up->port.line = i;
+		up->port.ops = &serial8250_pops;
+		init_timer(&up->timer);
+		up->timer.function = serial8250_timeout;
+
+		/*
+		 * ALPHA_KLUDGE_MCR needs to be killed.
+		 */
+		up->mcr_mask = ~ALPHA_KLUDGE_MCR;
+		up->mcr_force = ALPHA_KLUDGE_MCR;
+
+		uart_add_one_port(drv, &up->port);
+	}
+}
+
+#ifdef CONFIG_SERIAL_AU1X00_CONSOLE
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+/*
+ *	Wait for transmitter & holding register to empty
+ */
+static inline void wait_for_xmitr(struct uart_8250_port *up)
+{
+	unsigned int status, tmout = 10000;
+
+	/* Wait up to 10ms for the character(s) to be sent. */
+	do {
+		status = serial_in(up, UART_LSR);
+
+		if (status & UART_LSR_BI)
+			up->lsr_break_flag = UART_LSR_BI;
+
+		if (--tmout == 0)
+			break;
+		udelay(1);
+	} while ((status & BOTH_EMPTY) != BOTH_EMPTY);
+
+	/* Wait up to 1s for flow control if necessary */
+	if (up->port.flags & UPF_CONS_FLOW) {
+		tmout = 1000000;
+		while (--tmout &&
+		       ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
+			udelay(1);
+	}
+}
+
+/*
+ *	Print a string to the serial port trying not to disturb
+ *	any possible real use of the port...
+ *
+ *	The console_lock must be held when we get here.
+ */
+static void
+serial8250_console_write(struct console *co, const char *s, unsigned int count)
+{
+	struct uart_8250_port *up = &serial8250_ports[co->index];
+	unsigned int ier;
+	int i;
+
+	/*
+	 *	First save the UER then disable the interrupts
+	 */
+	ier = serial_in(up, UART_IER);
+	serial_out(up, UART_IER, 0);
+
+	/*
+	 *	Now, do each character
+	 */
+	for (i = 0; i < count; i++, s++) {
+		wait_for_xmitr(up);
+
+		/*
+		 *	Send the character out.
+		 *	If a LF, also do CR...
+		 */
+		serial_out(up, UART_TX, *s);
+		if (*s == 10) {
+			wait_for_xmitr(up);
+			serial_out(up, UART_TX, 13);
+		}
+	}
+
+	/*
+	 *	Finally, wait for transmitter to become empty
+	 *	and restore the IER
+	 */
+	wait_for_xmitr(up);
+	serial_out(up, UART_IER, ier);
+}
+
+static int __init serial8250_console_setup(struct console *co, char *options)
+{
+	struct uart_port *port;
+	int baud = 9600;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	/*
+	 * Check whether an invalid uart number has been specified, and
+	 * if so, search for the first available port that does have
+	 * console support.
+	 */
+	if (co->index >= UART_NR)
+		co->index = 0;
+	port = &serial8250_ports[co->index].port;
+
+	/*
+	 * Temporary fix.
+	 */
+	spin_lock_init(&port->lock);
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+extern struct uart_driver serial8250_reg;
+static struct console serial8250_console = {
+	.name		= "ttyS",
+	.write		= serial8250_console_write,
+	.device		= uart_console_device,
+	.setup		= serial8250_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+	.data		= &serial8250_reg,
+};
+
+static int __init serial8250_console_init(void)
+{
+	serial8250_isa_init_ports();
+	register_console(&serial8250_console);
+	return 0;
+}
+console_initcall(serial8250_console_init);
+
+#define SERIAL8250_CONSOLE	&serial8250_console
+#else
+#define SERIAL8250_CONSOLE	NULL
+#endif
+
+static struct uart_driver serial8250_reg = {
+	.owner			= THIS_MODULE,
+	.driver_name		= "serial",
+	.devfs_name		= "tts/",
+	.dev_name		= "ttyS",
+	.major			= TTY_MAJOR,
+	.minor			= 64,
+	.nr			= UART_NR,
+	.cons			= SERIAL8250_CONSOLE,
+};
+
+int __init early_serial_setup(struct uart_port *port)
+{
+	serial8250_isa_init_ports();
+	serial8250_ports[port->line].port	= *port;
+	serial8250_ports[port->line].port.ops	= &serial8250_pops;
+	return 0;
+}
+
+/**
+ *	serial8250_suspend_port - suspend one serial port
+ *	@line:  serial line number
+ *      @level: the level of port suspension, as per uart_suspend_port
+ *
+ *	Suspend one serial port.
+ */
+void serial8250_suspend_port(int line)
+{
+	uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port);
+}
+
+/**
+ *	serial8250_resume_port - resume one serial port
+ *	@line:  serial line number
+ *      @level: the level of port resumption, as per uart_resume_port
+ *
+ *	Resume one serial port.
+ */
+void serial8250_resume_port(int line)
+{
+	uart_resume_port(&serial8250_reg, &serial8250_ports[line].port);
+}
+
+static int __init serial8250_init(void)
+{
+	int ret, i;
+
+	printk(KERN_INFO "Serial: Au1x00 driver\n");
+
+	for (i = 0; i < NR_IRQS; i++)
+		spin_lock_init(&irq_lists[i].lock);
+
+	ret = uart_register_driver(&serial8250_reg);
+	if (ret >= 0)
+		serial8250_register_ports(&serial8250_reg);
+
+	return ret;
+}
+
+static void __exit serial8250_exit(void)
+{
+	int i;
+
+	for (i = 0; i < UART_NR; i++)
+		uart_remove_one_port(&serial8250_reg, &serial8250_ports[i].port);
+
+	uart_unregister_driver(&serial8250_reg);
+}
+
+module_init(serial8250_init);
+module_exit(serial8250_exit);
+
+EXPORT_SYMBOL(serial8250_suspend_port);
+EXPORT_SYMBOL(serial8250_resume_port);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Au1x00 serial driver\n");