path: root/recipes/linux/linux-2.6.18/atmel-usart3-driver.patch

From nobody Mon Sep 17 00:00:00 2001
From: Håvard Skinnemoen <hskinnemoen@atmel.com>
Date: Fri Nov 18 16:31:34 2005 +0100
Subject: [PATCH] AVR32: USART3 Serial Driver

---

 drivers/serial/Kconfig       |   21 
 drivers/serial/Makefile      |    1 
 drivers/serial/atmel_usart.c | 1086 +++++++++++++++++++++++++++++++++++++++++++
 drivers/serial/atmel_usart.h |  290 +++++++++++
 4 files changed, 1398 insertions(+)

Index: linux-2.6.18-avr32/drivers/serial/Kconfig
===================================================================
--- linux-2.6.18-avr32.orig/drivers/serial/Kconfig	2006-11-02 14:16:07.000000000 +0100
+++ linux-2.6.18-avr32/drivers/serial/Kconfig	2006-11-02 15:54:18.000000000 +0100
@@ -246,6 +246,27 @@ config SERIAL_8250_AU1X00
 
 comment "Non-8250 serial port support"
 
+config SERIAL_ATMEL
+	tristate "Atmel USART3 serial port support"
+	depends on AVR32
+	select SERIAL_CORE
+	default y
+	help
+	  Support for the Atmel USART3 on-chip USART found in most
+	  AT32 and AT91 parts from Atmel.
+
+	  If unsure, say Y.
+
+config SERIAL_ATMEL_CONSOLE
+	bool "Support for console on Atmel USART3 serial port"
+	depends on SERIAL_ATMEL=y
+	select SERIAL_CORE_CONSOLE
+	help
+	  Say Y here if you wish to use an Atmel USART3 serial port as
+	  the system console (the system console is the device which
+	  receives all kernel messages and warnings and which allows
+	  logins in single user mode).
+
 config SERIAL_AMBA_PL010
 	tristate "ARM AMBA PL010 serial port support"
 	depends on ARM_AMBA && (BROKEN || !ARCH_VERSATILE)
Index: linux-2.6.18-avr32/drivers/serial/Makefile
===================================================================
--- linux-2.6.18-avr32.orig/drivers/serial/Makefile	2006-11-02 14:16:07.000000000 +0100
+++ linux-2.6.18-avr32/drivers/serial/Makefile	2006-11-02 14:17:29.000000000 +0100
@@ -20,6 +20,7 @@ obj-$(CONFIG_SERIAL_8250_BOCA) += 8250_b
 obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
 obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mca.o
 obj-$(CONFIG_SERIAL_8250_AU1X00) += 8250_au1x00.o
+obj-$(CONFIG_SERIAL_ATMEL) += atmel_usart.o
 obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
 obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
 obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
Index: linux-2.6.18-avr32/drivers/serial/atmel_usart.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18-avr32/drivers/serial/atmel_usart.c	2006-11-02 15:54:18.000000000 +0100
@@ -0,0 +1,1086 @@
+/*
+ * Driver for Atmel USART3 Serial ports
+ *
+ * Based on AT91RM9200 serial driver by Rick Bronson
+ * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ * Based on drivers/serial/sa1100.c by Deep Blue Solutions Ltd.
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/clk.h>
+#include <linux/console.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/serial.h>
+#include <linux/tty.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/arch/board.h>
+
+#if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#include <linux/sysrq.h>
+#endif
+
+#include <linux/serial_core.h>
+
+#include "atmel_usart.h"
+
+/*
+ * TODO: Move this definition into linux/serial_core.h
+ */
+#define PORT_USART3		60
+
+/*
+ * Use the same major/minor numbers as the AT91 USART, which is
+ * actually the same chip
+ */
+#define SERIAL_USART3_MAJOR	TTY_MAJOR
+#define MINOR_START		64
+#define NR_PORTS		4
+
+#define ERROR_FLAGS		(USART3_BIT(CSR_PARE)		\
+				 | USART3_BIT(CSR_FRAME)	\
+				 | USART3_BIT(CSR_OVRE))
+
+/* Must be a power of two, or everything will break */
+#define RX_BUFFER_SIZE		32
+struct usart3_port {
+	void __iomem *regs;
+	int break_active;
+	unsigned int tx_dma_head;
+	int rx_tail;
+	char *rx_buffer;
+	dma_addr_t rx_dma;
+	dma_addr_t tx_dma;
+	struct clk *mck;
+	unsigned long mapsize;
+	struct uart_port uart;
+};
+#define to_usart3_port(port) container_of(port, struct usart3_port, uart)
+
+static void tx_dma_sync(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	struct circ_buf *xmit = &port->info->xmit;
+
+	if (xmit->head < up->tx_dma_head) {
+		dma_sync_single_for_device(port->dev,
+					   up->tx_dma + up->tx_dma_head,
+					   UART_XMIT_SIZE - up->tx_dma_head,
+					   DMA_TO_DEVICE);
+		dma_sync_single_for_device(port->dev, up->tx_dma,
+					   xmit->head, DMA_TO_DEVICE);
+	} else {
+		dma_sync_single_for_device(port->dev,
+					   up->tx_dma + up->tx_dma_head,
+					   xmit->head - up->tx_dma_head,
+					   DMA_TO_DEVICE);
+	}
+}
+
+static void tx_dma_update_tail(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	struct circ_buf *xmit = &port->info->xmit;
+	unsigned long status, remaining;
+	unsigned int new_tail;
+
+	/* Account for the characters DMA'ed since last update */
+	remaining = usart3_readl(up, TCR);
+
+	if (up->tx_dma_head < xmit->tail) {
+		/*
+		 * We have wrapped around, and there's a chunk at the
+		 * beginning of the buffer that has been submitted for
+		 * DMA.  If the ENDTX bit is set, it means that the
+		 * DMA controller also has wrapped around and copied
+		 * TNPR/TNCR into TPR/TCR.
+		 */
+		status = usart3_readl(up, CSR);
+		BUG_ON((up->tx_dma_head != 0)
+		       && (usart3_readl(up, TNCR) == 0)
+		       && !(status & USART3_BIT(ENDTX)));
+		if (status & USART3_BIT(ENDTX)) {
+			BUG_ON(usart3_readl(up, TNCR) != 0);
+
+			/* The ENDTX bit might be set after we read TCR */
+			remaining = usart3_readl(up, TCR);
+
+			usart3_writel(up, TNCR, 0);
+			port->icount.tx += UART_XMIT_SIZE - xmit->tail;
+			xmit->tail = 0;
+
+			BUG_ON(remaining > up->tx_dma_head);
+			new_tail = up->tx_dma_head - remaining;
+		} else {
+			/*
+			 * The DMA controller hasn't switched yet, so
+			 * TCR indicates the number of bytes left
+			 * until this happens.
+			 */
+			new_tail = UART_XMIT_SIZE - remaining;
+		}
+	} else {
+		/* No wraparound, move the tail closer to dma_head. */
+		BUG_ON(remaining > up->tx_dma_head);
+		new_tail = up->tx_dma_head - remaining;
+	}
+
+	BUG_ON(new_tail < xmit->tail);
+	port->icount.tx += new_tail - xmit->tail;
+	xmit->tail = new_tail;
+}
+
+static inline void tx_dma_start(struct usart3_port *up)
+{
+	/* Start the PDC and enable interrupts */
+	usart3_writel(up, PTCR, USART3_BIT(TXTEN));
+	usart3_writel(up, IER, USART3_BIT(ENDTX));
+}
+
+static inline void tx_dma_stop(struct usart3_port *up)
+{
+	usart3_writel(up, PTCR, USART3_BIT(TXTDIS));
+	usart3_writel(up, IDR, USART3_BIT(ENDTX));
+}
+
+static inline unsigned int rx_dma_get_head(struct usart3_port *up)
+{
+	unsigned int head;
+	u32 status;
+
+	head = RX_BUFFER_SIZE - usart3_readl(up, RCR);
+	status = usart3_readl(up, CSR);
+	if (status & USART3_BIT(ENDRX))
+		head = RX_BUFFER_SIZE;
+
+	return head;
+}
+
+static inline int rx_dma_update_tail(struct usart3_port *up,
+				     unsigned int tail)
+{
+	int again = 0;
+
+	if (!(tail & (RX_BUFFER_SIZE - 1))) {
+		u32 rnpr = up->rx_dma;
+
+		tail &= RX_BUFFER_SIZE;
+		if (!tail)
+			rnpr += RX_BUFFER_SIZE;
+
+		usart3_writel(up, RNPR, rnpr);
+		usart3_writel(up, RNCR, RX_BUFFER_SIZE);
+
+		again = 1;
+	} else
+		BUG_ON(usart3_readl(up, CSR) & USART3_BIT(ENDRX));
+
+	up->rx_tail = tail;
+
+	return again;
+}
+
+static void usart3_stop_tx(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+
+	tx_dma_stop(up);
+	tx_dma_update_tail(port);
+}
+
+static void usart3_start_tx(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	struct circ_buf *xmit = &port->info->xmit;
+
+	BUG_ON(!irqs_disabled());
+
+	/*
+	 * Stop the DMA engine so that we don't have to worry about race
+	 * conditions when updating the various pointers and counters.
+	 */
+	tx_dma_stop(up);
+
+	tx_dma_sync(port);
+	tx_dma_update_tail(port);
+
+	if (uart_circ_empty(xmit))
+		return;
+
+	usart3_writel(up, TPR, up->tx_dma + xmit->tail);
+
+	if (xmit->head > xmit->tail) {
+		usart3_writel(up, TCR, xmit->head - xmit->tail);
+	} else {
+		usart3_writel(up, TCR, UART_XMIT_SIZE - xmit->tail);
+		usart3_writel(up, TNPR, up->tx_dma);
+		usart3_writel(up, TNCR, xmit->head);
+	}
+
+	/* Keep track of what we've submitted for DMA */
+	up->tx_dma_head = xmit->head;
+
+	/* Resume operation of DMA engine. */
+	tx_dma_start(up);
+}
+
+static void usart3_stop_rx(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+
+	pr_debug("usart3: stop_rx\n");
+
+	usart3_writel(up, PTCR, USART3_BIT(RXTDIS));
+	usart3_writel(up, IDR, (USART3_BIT(TIMEOUT)
+				| USART3_BIT(ENDRX)
+				| USART3_BIT(RXBRK)
+				| USART3_BIT(OVRE)
+				| USART3_BIT(FRAME)
+				| USART3_BIT(PARE)));
+}
+
+static void usart3_flush_buffer(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+
+	/*
+	 * Reset TX DMA state. Note that we must _always_ update TNCR
+	 * before TCR, since the value in TNCR will automatically move
+	 * to TCR when TCR is 0.
+	 */
+	usart3_writel(up, TNCR, 0);
+	usart3_writel(up, TCR, 0);
+	up->tx_dma_head = port->info->xmit.tail;
+}
+
+/*
+ * Enable modem status interrupts
+ */
+static void usart3_enable_ms(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+
+	pr_debug("usart3: enable_ms\n");
+	usart3_writel(up, IER, (USART3_BIT(RIIC)
+				| USART3_BIT(DSRIC)
+				| USART3_BIT(DCDIC)
+				| USART3_BIT(CTSIC)));
+}
+
+static inline void handle_rx_error(struct uart_port *port, u32 status)
+{
+	/*
+	 * FIXME: Errors should affect the flag buffer, but due to the
+	 * PDC, we don't really know which char they belong to...
+	 */
+	if (status & USART3_BIT(PARE)) {
+		printk(KERN_NOTICE "usart%u: Parity error\n", port->line);
+		port->icount.parity++;
+	} else if (status & USART3_BIT(FRAME)) {
+		printk(KERN_NOTICE "usart%u: Frame error\n", port->line);
+		port->icount.frame++;
+	}
+	if (status & USART3_BIT(OVRE)) {
+		printk(KERN_NOTICE "usart%u: Overrun\n", port->line);
+		port->icount.overrun++;
+	}
+
+#ifdef SUPPORT_SYSRQ
+	port->sysrq = 0;
+#endif
+}
+
+static inline void handle_pdc_endtx(struct uart_port *port, unsigned long status)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	struct circ_buf *xmit = &port->info->xmit;
+
+	tx_dma_update_tail(port);
+
+	if (uart_tx_stopped(port)) {
+		usart3_stop_tx(port);
+		printk("usart3: stopped\n");
+		return;
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	if (uart_circ_empty(xmit))
+		usart3_stop_tx(port);
+
+	/*
+	 * It could be that xmit is being updated right now. If so,
+	 * start_tx() will be called shortly.
+	 */
+	if (status & USART3_BIT(TXBUFE))
+		usart3_writel(up, IDR, USART3_BIT(ENDTX));
+}
+
+static void consume_rx_buffer(struct uart_port *port, struct pt_regs *regs)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	struct tty_struct *tty = port->info->tty;
+	unsigned long head, tail;
+	int len;
+	int again;
+
+	do {
+		/*
+		 * Re-arm the timeout before we decide how many
+		 * characters to read.
+		 */
+		usart3_writel(up, CR, USART3_BIT(STTTO));
+
+		head = rx_dma_get_head(up);
+
+		tail = up->rx_tail;
+		if (tail & RX_BUFFER_SIZE)
+			head += RX_BUFFER_SIZE;
+
+		if (head == tail)
+			break;
+
+		dma_sync_single_for_cpu(port->dev, up->rx_dma + tail,
+					head - tail, DMA_FROM_DEVICE);
+
+		if (uart_handle_sysrq_char(port, up->rx_buffer[tail],
+					   regs)) {
+			tail++;
+			if (head == tail)
+				goto update_tail;
+		}
+
+		len = tty_insert_flip_string(tty, up->rx_buffer + tail,
+					     head - tail);
+		port->icount.rx += len;
+		tail += len;
+		if (!(head & (RX_BUFFER_SIZE - 1)) && tail != head) {
+			/*
+			 * head has wrapped, but there isn't enough
+			 * room in the buffer to handle all the
+			 * characters.  We must recycle this buffer in
+			 * order to clear the interrupt.
+			 */
+			tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+			tail = head;
+		}
+
+	update_tail:
+		again = rx_dma_update_tail(up, tail);
+	} while (again);
+
+	tty_flip_buffer_push(tty);
+}
+
+/*
+ * This is the serial driver's interrupt routine
+ */
+static irqreturn_t usart3_interrupt(int irq, void *dev_id,
+				    struct pt_regs *regs)
+{
+	struct uart_port *port = dev_id;
+	struct usart3_port *up = to_usart3_port(port);
+	u32 status, mask, pending;
+	irqreturn_t ret = IRQ_NONE;
+
+	spin_lock(&port->lock);
+
+	status = usart3_readl(up, CSR);
+	mask = usart3_readl(up, IMR);
+	pending = status & mask;
+	if (unlikely(!pending))
+		goto out;
+
+	ret = IRQ_HANDLED;
+
+	do {
+		/*
+		 * Consume the buffer and flip buffers if necessary.
+		 */
+		consume_rx_buffer(port, regs);
+
+		/* Clear any break and error flags */
+		usart3_writel(up, CR, USART3_BIT(RSTSTA));
+
+		if (pending & (USART3_BIT(OVRE)
+			       | USART3_BIT(FRAME)
+			       | USART3_BIT(PARE)))
+			handle_rx_error(port, status);
+
+		if (pending & USART3_BIT(RXBRK)) {
+			if (up->break_active) {
+				up->break_active = 0;
+			} else {
+				up->break_active = 1;
+				port->icount.brk++;
+				uart_handle_break(port);
+			}
+		}
+
+		if (pending & USART3_BIT(RIIC))
+			port->icount.rng++;
+		if (pending & USART3_BIT(DSRIC))
+			port->icount.dsr++;
+		if (pending & USART3_BIT(DCDIC)) {
+			port->icount.dcd++;
+			uart_handle_dcd_change
+				(port, status & USART3_BIT(DCD));
+		}
+		if (pending & USART3_BIT(CTSIC)) {
+			port->icount.cts++;
+			uart_handle_cts_change
+				(port, status & USART3_BIT(CTS));
+		}
+		if (pending & (USART3_BIT(RIIC)
+			       | USART3_BIT(DSRIC)
+			       | USART3_BIT(DCDIC)
+			       | USART3_BIT(CTSIC)))
+			wake_up_interruptible(&port->info->delta_msr_wait);
+
+		if (pending & USART3_BIT(ENDTX))
+			handle_pdc_endtx(port, status);
+
+		status = usart3_readl(up, CSR);
+		pending = status & usart3_readl(up, IMR);
+	} while (pending);
+
+out:
+	spin_unlock(&port->lock);
+	return ret;
+}
+
+/*
+ * Return TIOCSER_TEMT when transmitter is not busy
+ */
+static unsigned int usart3_tx_empty(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	unsigned int ret = 0;
+
+	if (usart3_readl(up, CSR) & USART3_BIT(TXEMPTY))
+		ret = TIOCSER_TEMT;
+
+	pr_debug("usart3: tx_empty returned %x\n", ret);
+
+	return ret;
+}
+
+static unsigned int usart3_get_mctrl(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	unsigned int ret = 0;
+	unsigned int status;
+
+	status = usart3_readl(up, CSR);
+	if (status & USART3_BIT(DCD))
+		ret |= TIOCM_CD;
+	if (status & USART3_BIT(CTS))
+		ret |= TIOCM_CTS;
+	if (status & USART3_BIT(DSR))
+		ret |= TIOCM_DSR;
+	if (status & USART3_BIT(RI))
+		ret |= TIOCM_RI;
+
+	pr_debug("usart3: get_mctrl returned %x\n", ret);
+
+	return ret;
+}
+
+static void usart3_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	unsigned int control = 0;
+
+	pr_debug("usart3: set_mctrl %x\n", mctrl);
+
+	if (mctrl & TIOCM_RTS)
+		control |= USART3_BIT(RTSEN);
+	else
+		control |= USART3_BIT(RTSDIS);
+
+	if (mctrl & TIOCM_DTR)
+		control |= USART3_BIT(DTREN);
+	else
+		control |= USART3_BIT(DTRDIS);
+
+	usart3_writel(up, CR, control);
+}
+
+static void usart3_break_ctl(struct uart_port *port, int break_state)
+{
+	struct usart3_port *up = to_usart3_port(port);
+
+	pr_debug("usart3: break_ctl %u\n", break_state);
+	if (break_state != 0)
+		usart3_writel(up, CR, USART3_BIT(STTBRK));
+	else
+		usart3_writel(up, CR, USART3_BIT(STPBRK));
+}
+
+static int usart3_startup(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	int ret;
+
+	pr_debug("usart3: startup\n");
+
+	up->break_active = 0;
+
+	/* Set up interrupt handler */
+	ret = request_irq(port->irq, usart3_interrupt, 0,
+			  port->info->tty->name, port);
+	if (ret) {
+		printk(KERN_ERR "usart3: Unable to request irq %d\n",
+		       port->irq);
+		return ret;
+	}
+
+	up->rx_dma = dma_map_single(port->dev, up->rx_buffer,
+				    2 * RX_BUFFER_SIZE, DMA_FROM_DEVICE);
+	up->tx_dma = dma_map_single(port->dev, port->info->xmit.buf,
+				    UART_XMIT_SIZE, DMA_TO_DEVICE);
+
+	/* Initialize the PDC for RX (TX is done in start_tx) */
+	up->rx_tail = 0;
+	usart3_writel(up, RPR, up->rx_dma);
+	usart3_writel(up, RCR, RX_BUFFER_SIZE);
+	usart3_writel(up, RNPR, up->rx_dma + RX_BUFFER_SIZE);
+	usart3_writel(up, RNCR, RX_BUFFER_SIZE);
+	usart3_writel(up, PTCR, USART3_BIT(RXTEN));
+
+	/* Reset DMA state */
+	usart3_writel(up, TNCR, 0);
+	usart3_writel(up, TCR, 0);
+	up->tx_dma_head = port->info->xmit.tail;
+
+	/*
+	 * Set a suitable timeout. 2000 bit periods corresponds to
+	 * about 17 ms at 115200 bps
+	 */
+	usart3_writel(up, RTOR, 2000);
+
+	/* Reset and enable receiver and transmitter */
+	usart3_writel(up, CR, (USART3_BIT(RSTRX)
+				  | USART3_BIT(RSTTX)
+				  | USART3_BIT(RSTSTA)));
+	usart3_writel(up, CR, (USART3_BIT(RXEN)
+				  | USART3_BIT(TXEN)));
+
+	/* Enable timeout, end of rx, break and error interrupts */
+	usart3_writel(up, IER, (USART3_BIT(TIMEOUT)
+				   | USART3_BIT(ENDRX)
+				   | USART3_BIT(RXBRK)
+				   | USART3_BIT(OVRE)
+				   | USART3_BIT(FRAME)
+				   | USART3_BIT(PARE)));
+
+	/* Arm the timeout counter */
+	usart3_writel(up, CR, USART3_BIT(STTTO));
+
+	return 0;
+}
+
+static void usart3_shutdown(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+
+	pr_debug("usart3: shutdown\n");
+
+	/* Disable all interrupts and reset any error flags */
+	usart3_writel(up, IDR, -1L);
+	usart3_writel(up, CR, USART3_BIT(RSTSTA));
+
+	dma_unmap_single(port->dev, up->rx_dma, 2 * RX_BUFFER_SIZE,
+			 DMA_FROM_DEVICE);
+	dma_unmap_single(port->dev, up->tx_dma, UART_XMIT_SIZE,
+			 DMA_TO_DEVICE);
+
+	free_irq(port->irq, port);
+}
+
+static void usart3_set_termios(struct uart_port *port, struct termios *termios,
+			       struct termios *old)
+{
+	struct usart3_port *up = to_usart3_port(port);
+	unsigned int baud, quot, mode = 0;
+	unsigned int imr, flags;
+
+	pr_debug("usart3: set_termios\n");
+
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		mode |= USART3_BF(CHRL, USART3_CHRL_5);
+		break;
+	case CS6:
+		mode |= USART3_BF(CHRL, USART3_CHRL_6);
+		break;
+	case CS7:
+		mode |= USART3_BF(CHRL, USART3_CHRL_7);
+		break;
+	default:
+		mode |= USART3_BF(CHRL, USART3_CHRL_8);
+		break;
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		mode |= USART3_BF(NBSTOP, USART3_NBSTOP_2);
+
+	if (termios->c_cflag & PARENB) {
+		 if (termios->c_cflag & PARODD)
+			 mode |= USART3_BF(PAR, USART3_PAR_ODD);
+		 else
+			 mode |= USART3_BF(PAR, USART3_PAR_EVEN);
+	} else {
+		mode |= USART3_BF(PAR, USART3_PAR_NONE);
+	}
+
+	/*
+	 * Ask the core to calculate the divisor for us.
+	 */
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+	quot = uart_get_divisor(port, baud);
+
+	/* Bits to ignore, timeout, etc. TBD */
+
+	/*
+	 * Save and disable interrupts
+	 */
+	spin_lock_irqsave(&port->lock, flags);
+	imr = usart3_readl(up, IMR);
+	usart3_writel(up, IDR, -1L);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	/*
+	 * Make sure transmitter is empty. If BRGR == 0, it is safest
+	 * to do a reset, since waiting for the transmitter to be
+	 * empty will take forever.
+	 */
+	if (usart3_readl(up, BRGR) != 0) {
+		while (!(usart3_readl(up, CSR) & USART3_BIT(TXRDY)))
+			barrier();
+	} else {
+		usart3_writel(up, CR, (USART3_BIT(RSTTX)
+					  | USART3_BIT(RSTRX)));
+	}
+
+	pr_debug("usart3: Setting BRGR to %u (baud rate %u)...\n", quot, baud);
+
+	/* Disable receiver and transmitter */
+	usart3_writel(up, CR, (USART3_BIT(TXDIS)
+				  | USART3_BIT(RXDIS)));
+
+	/* Set the parity, stop bits and data size */
+	usart3_writel(up, MR, mode);
+
+	/* Set the baud rate and enable receiver and transmitter */
+	usart3_writel(up, BRGR, quot);
+	usart3_writel(up, CR, (USART3_BIT(TXEN)
+				  | USART3_BIT(RXEN)));
+
+	/* Restore interrupts */
+	usart3_writel(up, IER, imr);
+}
+
+static const char *usart3_type(struct uart_port *port)
+{
+	return "USART3";
+}
+
+static void usart3_release_port(struct uart_port *port)
+{
+	pr_debug("usart3: release_port\n");
+	iounmap(port->membase);
+	port->flags |= UPF_IOREMAP;
+}
+
+static int usart3_request_port(struct uart_port *port)
+{
+	struct usart3_port *up = to_usart3_port(port);
+
+	/* TODO: remove this */
+	pr_debug("usart3: request_port\n");
+	if (port->flags & UPF_IOREMAP) {
+		port->membase = ioremap(port->mapbase, up->mapsize);
+		up->regs = port->membase;
+		port->flags &= ~UPF_IOREMAP;
+	}
+	return 0;
+}
+
+static void usart3_config_port(struct uart_port *port, int flags)
+{
+	pr_debug("usart3: config_port\n");
+	if (flags & UART_CONFIG_TYPE) {
+		if (usart3_request_port(port) == 0)
+			port->type = PORT_USART3;
+	}
+}
+
+static int usart3_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	int ret = 0;
+
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_USART3)
+		ret = -EINVAL;
+	if (port->irq != ser->irq)
+		ret = -EINVAL;
+	if (ser->io_type != SERIAL_IO_MEM)
+		ret = -EINVAL;
+	if (port->uartclk / 16 != ser->baud_base)
+		ret = -EINVAL;
+	if ((void *)port->mapbase != ser->iomem_base)
+		ret = -EINVAL;
+	if (ser->hub6 != 0)
+		ret = -EINVAL;
+
+	pr_debug("usart3_verify_port returned %d\n", ret);
+
+	return ret;
+}
+
+static struct uart_ops usart3_pops = {
+	.tx_empty	= usart3_tx_empty,
+	.set_mctrl	= usart3_set_mctrl,
+	.get_mctrl	= usart3_get_mctrl,
+	.stop_tx	= usart3_stop_tx,
+	.start_tx	= usart3_start_tx,
+	.stop_rx	= usart3_stop_rx,
+	.enable_ms	= usart3_enable_ms,
+	.break_ctl	= usart3_break_ctl,
+	.startup	= usart3_startup,
+	.shutdown	= usart3_shutdown,
+	.flush_buffer	= usart3_flush_buffer,
+	.set_termios	= usart3_set_termios,
+	.type		= usart3_type,
+	.release_port	= usart3_release_port,
+	.request_port	= usart3_request_port,
+	.config_port	= usart3_config_port,
+	.verify_port	= usart3_verify_port,
+};
+
+static int __devinit initialize_port(struct usart3_port *up,
+				      struct platform_device *pdev)
+{
+	struct uart_port *port = &up->uart;
+	struct resource *regs;
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!regs)
+		return -ENXIO;
+
+	spin_lock_init(&port->lock);
+
+	up->mck = clk_get(&pdev->dev, "usart");
+	if (IS_ERR(up->mck))
+		return PTR_ERR(up->mck);
+	clk_enable(up->mck);
+
+	port->mapbase = regs->start;
+	up->mapsize = regs->end - regs->start + 1;
+	port->irq = platform_get_irq(pdev, 0);
+
+	port->uartclk = clk_get_rate(up->mck);
+	port->iotype = SERIAL_IO_MEM;
+	port->flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
+	port->ops = &usart3_pops;
+	port->line = pdev->id;
+	port->dev = &pdev->dev;
+
+	return 0;
+}
+
+static struct usart3_port usart3_ports[NR_PORTS];
+
+#ifdef CONFIG_SERIAL_ATMEL_CONSOLE
+
+static void usart3_console_write(struct console *console, const char *string,
+				 unsigned int len)
+{
+	struct usart3_port *up = &usart3_ports[console->index];
+	unsigned int imr, i;
+	unsigned long flags, ptsr;
+
+	/*
+	 * Save IMR, then disable interrupts
+	 */
+	local_irq_save(flags);
+	imr = usart3_readl(up, IMR);
+	usart3_writel(up, IDR, ~0UL);
+	local_irq_restore(flags);
+
+	/*
+	 * Save PDC state and disable PDC transmission
+	 */
+	ptsr = usart3_readl(up, PTSR);
+	usart3_writel(up, PTCR, USART3_BIT(TXTDIS));
+
+	/*
+	 * Now, do each character
+	 */
+	for (i = 0; i < len; i++, string++) {
+		char c = *string;
+
+		/*
+		 * If we're sending LF, send CR first...
+		 */
+		if (c == '\n') {
+			while (!(usart3_readl(up, CSR)
+				 & USART3_BIT(TXRDY)))
+				;
+			usart3_writel(up, THR, '\r');
+		}
+		while (!(usart3_readl(up, CSR) & USART3_BIT(TXRDY)))
+			;
+		usart3_writel(up, THR, c);
+	}
+
+	/*
+	 * Wait for transmitter to become empty and restore the IMR
+	 * and PDC state.
+	 */
+	while (!(usart3_readl(up, CSR) & USART3_BIT(TXRDY)))
+		;
+
+	usart3_writel(up, PTCR, ptsr & USART3_BIT(TXTEN));
+	usart3_writel(up, IER, imr);
+}
+
+static int __init usart3_console_setup(struct console *console,
+				       char *options)
+{
+	struct platform_device *pdev;
+	struct usart3_port *up;
+	struct uart_port *port;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+	int ret;
+
+	if (console->index >= NR_PORTS) {
+		printk(KERN_ERR
+		       "Can't use USART%u for console: index >= NR_PORTS\n",
+		       console->index);
+		return -ENODEV;
+	}
+
+	pdev = at91_default_console_device;
+	if (!pdev)
+		return -ENXIO;
+
+	up = &usart3_ports[console->index];
+	port = &up->uart;
+
+	ret = initialize_port(up, pdev);
+	if (ret)
+		return ret;
+
+	port->membase = ioremap(port->mapbase, up->mapsize);
+	ret = -ENOMEM;
+	if (!port->membase)
+		goto out_disable_clk;
+
+	up->regs = port->membase;
+
+	/* Set a fixed baud rate for now */
+	usart3_writel(up, BRGR, 2);
+
+	/* Make sure all interrupts are disabled and reset/enable the USART */
+	usart3_writel(up, IDR, -1L);
+	usart3_writel(up, CR, (USART3_BIT(RSTRX)
+				  | USART3_BIT(RSTTX)
+				  | USART3_BIT(RSTSTA)));
+	usart3_writel(up, CR, (USART3_BIT(RXEN)
+				  | USART3_BIT(TXEN)));
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(port, console, baud, parity, bits, flow);
+
+out_disable_clk:
+	clk_disable(up->mck);
+	clk_put(up->mck);
+	return ret;
+}
+
+static struct uart_driver usart3_reg;
+static struct console usart3_console = {
+	.name		= "ttyUS",
+	.write		= usart3_console_write,
+	.device		= uart_console_device,
+	.setup		= usart3_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+	.data		= &usart3_reg,
+};
+
+static int __init usart3_console_init(void)
+{
+	register_console(&usart3_console);
+	return 0;
+}
+console_initcall(usart3_console_init);
+
+#define USART3_CONSOLE &usart3_console
+
+#else
+#define USART3_CONSOLE NULL
+#endif
+
+static struct uart_driver usart3_reg = {
+	.owner		= THIS_MODULE,
+	.driver_name	= "serial",
+	.dev_name	= "ttyUS",
+	.major		= SERIAL_USART3_MAJOR,
+	.minor		= MINOR_START,
+	.nr		= NR_PORTS,
+	.cons		= USART3_CONSOLE,
+};
+
+static int usart3_serial_suspend(struct platform_device *pdev,
+				 pm_message_t state)
+{
+	struct usart3_port *port = platform_get_drvdata(pdev);
+	int retval = 0;
+
+	if (port)
+		retval = uart_suspend_port(&usart3_reg, &port->uart);
+
+	return retval;
+}
+
+static int usart3_serial_resume(struct platform_device *pdev)
+{
+	struct usart3_port *port = platform_get_drvdata(pdev);
+	int retval = 0;
+
+	if (port)
+		retval = uart_resume_port(&usart3_reg, &port->uart);
+
+	return retval;
+}
+
+static int __devinit usart3_serial_probe(struct platform_device *pdev)
+{
+	struct usart3_port *up;
+	int ret;
+
+	if (pdev->id >= NR_PORTS) {
+		printk(KERN_WARNING
+		       "Ignoring USART%u, as NR_PORTS is only %u\n",
+		       pdev->id, NR_PORTS);
+		return -ENOMEM;
+	}
+
+	up = &usart3_ports[pdev->id];
+
+	/*
+	 * If the port has already been set up as a console, we
+	 * shouldn't enable it again.
+	 */
+	if (!up->uart.uartclk) {
+		ret = initialize_port(up, pdev);
+		if (ret)
+			goto out;
+	}
+
+	/*
+	 * The RX buffer must be cacheline aligned. If it's not,
+	 * invalidating the cache could be disastrous...
+	 *
+	 * Fortunately, kmalloc() always returns cache-aligned memory.
+	 */
+	ret = -ENOMEM;
+	up->rx_buffer = kmalloc(2 * RX_BUFFER_SIZE, GFP_KERNEL);
+	if (!up->rx_buffer)
+		goto out_disable_clk;
+
+	ret = uart_add_one_port(&usart3_reg, &up->uart);
+	if (ret)
+		goto out_free_rx_buffer;
+
+	platform_set_drvdata(pdev, up);
+
+	return 0;
+
+out_free_rx_buffer:
+	kfree(up->rx_buffer);
+out_disable_clk:
+	clk_disable(up->mck);
+	clk_put(up->mck);
+out:
+	return ret;
+}
+
+static int __devexit usart3_serial_remove(struct platform_device *pdev)
+{
+	struct usart3_port *port = platform_get_drvdata(pdev);
+	int retval = 0;
+
+	platform_set_drvdata(pdev, NULL);
+
+	if (port) {
+		retval = uart_remove_one_port(&usart3_reg, &port->uart);
+		clk_disable(port->mck);
+		clk_put(port->mck);
+		kfree(port->rx_buffer);
+		kfree(port);
+	}
+
+	return retval;
+}
+
+static struct platform_driver usart3_serial_driver = {
+	.probe		= usart3_serial_probe,
+	.remove		= __devexit_p(usart3_serial_remove),
+	.suspend	= usart3_serial_suspend,
+	.resume		= usart3_serial_resume,
+	.driver		= {
+		.name	= "usart",
+	},
+};
+
+static int __init usart3_init(void)
+{
+	int ret;
+
+	printk(KERN_INFO "Serial: Atmel USART3 driver\n");
+
+	ret = uart_register_driver(&usart3_reg);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&usart3_serial_driver);
+	if (ret)
+		uart_unregister_driver(&usart3_reg);
+
+	return ret;
+}
+
+static void __exit usart3_exit(void)
+{
+	platform_driver_unregister(&usart3_serial_driver);
+	uart_unregister_driver(&usart3_reg);
+}
+
+module_init(usart3_init);
+module_exit(usart3_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Atmel USART3 serial driver");
+MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
Index: linux-2.6.18-avr32/drivers/serial/atmel_usart.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18-avr32/drivers/serial/atmel_usart.h	2006-11-02 16:37:02.000000000 +0100
@@ -0,0 +1,290 @@
+/*
+ * Register definitions for USART3
+ *
+ * Copyright (C) 2005-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_AVR32_USART3_H__
+#define __ASM_AVR32_USART3_H__
+
+/* USART3 register offsets */
+#define USART3_CR				0x0000
+#define USART3_MR				0x0004
+#define USART3_IER				0x0008
+#define USART3_IDR				0x000c
+#define USART3_IMR				0x0010
+#define USART3_CSR				0x0014
+#define USART3_RHR				0x0018
+#define USART3_THR				0x001c
+#define USART3_BRGR				0x0020
+#define USART3_RTOR				0x0024
+#define USART3_TTGR				0x0028
+#define USART3_FIDI				0x0040
+#define USART3_NER				0x0044
+#define USART3_XXR				0x0048
+#define USART3_IFR				0x004c
+
+/* PDC register offsets */
+#define USART3_RPR				0x100
+#define USART3_RCR				0x104
+#define USART3_TPR				0x108
+#define USART3_TCR				0x10c
+#define USART3_RNPR				0x110
+#define USART3_RNCR				0x114
+#define USART3_TNPR				0x118
+#define USART3_TNCR				0x11c
+#define USART3_PTCR				0x120
+#define USART3_PTSR				0x124
+
+/* Bitfields in CR */
+#define USART3_RSTRX_OFFSET			2
+#define USART3_RSTRX_SIZE			1
+#define USART3_RSTTX_OFFSET			3
+#define USART3_RSTTX_SIZE			1
+#define USART3_RXEN_OFFSET			4
+#define USART3_RXEN_SIZE			1
+#define USART3_RXDIS_OFFSET			5
+#define USART3_RXDIS_SIZE			1
+#define USART3_TXEN_OFFSET			6
+#define USART3_TXEN_SIZE			1
+#define USART3_TXDIS_OFFSET			7
+#define USART3_TXDIS_SIZE			1
+#define USART3_RSTSTA_OFFSET			8
+#define USART3_RSTSTA_SIZE			1
+#define USART3_STTBRK_OFFSET			9
+#define USART3_STTBRK_SIZE			1
+#define USART3_STPBRK_OFFSET			10
+#define USART3_STPBRK_SIZE			1
+#define USART3_STTTO_OFFSET			11
+#define USART3_STTTO_SIZE			1
+#define USART3_SENDA_OFFSET			12
+#define USART3_SENDA_SIZE			1
+#define USART3_RSTIT_OFFSET			13
+#define USART3_RSTIT_SIZE			1
+#define USART3_RSTNACK_OFFSET			14
+#define USART3_RSTNACK_SIZE			1
+#define USART3_RETTO_OFFSET			15
+#define USART3_RETTO_SIZE			1
+#define USART3_DTREN_OFFSET			16
+#define USART3_DTREN_SIZE			1
+#define USART3_DTRDIS_OFFSET			17
+#define USART3_DTRDIS_SIZE			1
+#define USART3_RTSEN_OFFSET			18
+#define USART3_RTSEN_SIZE			1
+#define USART3_RTSDIS_OFFSET			19
+#define USART3_RTSDIS_SIZE			1
+#define USART3_COMM_TX_OFFSET			30
+#define USART3_COMM_TX_SIZE			1
+#define USART3_COMM_RX_OFFSET			31
+#define USART3_COMM_RX_SIZE			1
+
+/* Bitfields in MR */
+#define USART3_USART_MODE_OFFSET		0
+#define USART3_USART_MODE_SIZE			4
+#define USART3_USCLKS_OFFSET			4
+#define USART3_USCLKS_SIZE			2
+#define USART3_CHRL_OFFSET			6
+#define USART3_CHRL_SIZE			2
+#define USART3_SYNC_OFFSET			8
+#define USART3_SYNC_SIZE			1
+#define USART3_PAR_OFFSET			9
+#define USART3_PAR_SIZE				3
+#define USART3_NBSTOP_OFFSET			12
+#define USART3_NBSTOP_SIZE			2
+#define USART3_CHMODE_OFFSET			14
+#define USART3_CHMODE_SIZE			2
+#define USART3_MSBF_OFFSET			16
+#define USART3_MSBF_SIZE			1
+#define USART3_MODE9_OFFSET			17
+#define USART3_MODE9_SIZE			1
+#define USART3_CLKO_OFFSET			18
+#define USART3_CLKO_SIZE			1
+#define USART3_OVER_OFFSET			19
+#define USART3_OVER_SIZE			1
+#define USART3_INACK_OFFSET			20
+#define USART3_INACK_SIZE			1
+#define USART3_DSNACK_OFFSET			21
+#define USART3_DSNACK_SIZE			1
+#define USART3_MAX_ITERATION_OFFSET		24
+#define USART3_MAX_ITERATION_SIZE		3
+#define USART3_FILTER_OFFSET			28
+#define USART3_FILTER_SIZE			1
+
+/* Bitfields in CSR */
+#define USART3_RXRDY_OFFSET			0
+#define USART3_RXRDY_SIZE			1
+#define USART3_TXRDY_OFFSET			1
+#define USART3_TXRDY_SIZE			1
+#define USART3_RXBRK_OFFSET			2
+#define USART3_RXBRK_SIZE			1
+#define USART3_ENDRX_OFFSET			3
+#define USART3_ENDRX_SIZE			1
+#define USART3_ENDTX_OFFSET			4
+#define USART3_ENDTX_SIZE			1
+#define USART3_OVRE_OFFSET			5
+#define USART3_OVRE_SIZE			1
+#define USART3_FRAME_OFFSET			6
+#define USART3_FRAME_SIZE			1
+#define USART3_PARE_OFFSET			7
+#define USART3_PARE_SIZE			1
+#define USART3_TIMEOUT_OFFSET			8
+#define USART3_TIMEOUT_SIZE			1
+#define USART3_TXEMPTY_OFFSET			9
+#define USART3_TXEMPTY_SIZE			1
+#define USART3_ITERATION_OFFSET			10
+#define USART3_ITERATION_SIZE			1
+#define USART3_TXBUFE_OFFSET			11
+#define USART3_TXBUFE_SIZE			1
+#define USART3_RXBUFF_OFFSET			12
+#define USART3_RXBUFF_SIZE			1
+#define USART3_NACK_OFFSET			13
+#define USART3_NACK_SIZE			1
+#define USART3_RIIC_OFFSET			16
+#define USART3_RIIC_SIZE			1
+#define USART3_DSRIC_OFFSET			17
+#define USART3_DSRIC_SIZE			1
+#define USART3_DCDIC_OFFSET			18
+#define USART3_DCDIC_SIZE			1
+#define USART3_CTSIC_OFFSET			19
+#define USART3_CTSIC_SIZE			1
+#define USART3_RI_OFFSET			20
+#define USART3_RI_SIZE				1
+#define USART3_DSR_OFFSET			21
+#define USART3_DSR_SIZE				1
+#define USART3_DCD_OFFSET			22
+#define USART3_DCD_SIZE				1
+#define USART3_CTS_OFFSET			23
+#define USART3_CTS_SIZE				1
+
+/* Bitfields in RHR */
+#define USART3_RXCHR_OFFSET			0
+#define USART3_RXCHR_SIZE			9
+
+/* Bitfields in THR */
+#define USART3_TXCHR_OFFSET			0
+#define USART3_TXCHR_SIZE			9
+
+/* Bitfields in BRGR */
+#define USART3_CD_OFFSET			0
+#define USART3_CD_SIZE				16
+
+/* Bitfields in RTOR */
+#define USART3_TO_OFFSET			0
+#define USART3_TO_SIZE				16
+
+/* Bitfields in TTGR */
+#define USART3_TG_OFFSET			0
+#define USART3_TG_SIZE				8
+
+/* Bitfields in FIDI */
+#define USART3_FI_DI_RATIO_OFFSET		0
+#define USART3_FI_DI_RATIO_SIZE			11
+
+/* Bitfields in NER */
+#define USART3_NB_ERRORS_OFFSET			0
+#define USART3_NB_ERRORS_SIZE			8
+
+/* Bitfields in XXR */
+#define USART3_XOFF_OFFSET			0
+#define USART3_XOFF_SIZE			8
+#define USART3_XON_OFFSET			8
+#define USART3_XON_SIZE				8
+
+/* Bitfields in IFR */
+#define USART3_IRDA_FILTER_OFFSET		0
+#define USART3_IRDA_FILTER_SIZE			8
+
+/* Bitfields in PTCR/PTSR (PDC) */
+#define USART3_RXTEN_OFFSET			0
+#define USART3_RXTEN_SIZE			1
+#define USART3_RXTDIS_OFFSET			1
+#define USART3_RXTDIS_SIZE			1
+#define USART3_TXTEN_OFFSET			8
+#define USART3_TXTEN_SIZE			1
+#define USART3_TXTDIS_OFFSET			9
+#define USART3_TXTDIS_SIZE			1
+
+/* Constants for USART_MODE */
+#define USART3_USART_MODE_NORMAL		0
+#define USART3_USART_MODE_RS485			1
+#define USART3_USART_MODE_HARDWARE		2
+#define USART3_USART_MODE_MODEM			3
+#define USART3_USART_MODE_ISO7816_T0		4
+#define USART3_USART_MODE_ISO7816_T1		6
+#define USART3_USART_MODE_IRDA			8
+
+/* Constants for USCLKS */
+#define USART3_USCLKS_MCK			0
+#define USART3_USCLKS_MCK_DIV			1
+#define USART3_USCLKS_SCK			3
+
+/* Constants for CHRL */
+#define USART3_CHRL_5				0
+#define USART3_CHRL_6				1
+#define USART3_CHRL_7				2
+#define USART3_CHRL_8				3
+
+/* Constants for PAR */
+#define USART3_PAR_EVEN				0
+#define USART3_PAR_ODD				1
+#define USART3_PAR_SPACE			2
+#define USART3_PAR_MARK				3
+#define USART3_PAR_NONE				4
+#define USART3_PAR_MULTI			6
+
+/* Constants for NBSTOP */
+#define USART3_NBSTOP_1				0
+#define USART3_NBSTOP_1_5			1
+#define USART3_NBSTOP_2				2
+
+/* Constants for CHMODE */
+#define USART3_CHMODE_NORMAL			0
+#define USART3_CHMODE_ECHO			1
+#define USART3_CHMODE_LOCAL_LOOP		2
+#define USART3_CHMODE_REMOTE_LOOP		3
+
+/* Constants for MSBF */
+#define USART3_MSBF_LSBF			0
+#define USART3_MSBF_MSBF			1
+
+/* Constants for OVER */
+#define USART3_OVER_X16				0
+#define USART3_OVER_X8				1
+
+/* Constants for CD */
+#define USART3_CD_DISABLE			0
+#define USART3_CD_BYPASS			1
+
+/* Constants for TO */
+#define USART3_TO_DISABLE			0
+
+/* Constants for TG */
+#define USART3_TG_DISABLE			0
+
+/* Constants for FI_DI_RATIO */
+#define USART3_FI_DI_RATIO_DISABLE		0
+
+/* Bit manipulation macros */
+#define USART3_BIT(name)				\
+	(1 << USART3_##name##_OFFSET)
+#define USART3_BF(name,value)				\
+	(((value) & ((1 << USART3_##name##_SIZE) - 1))	\
+	 << USART3_##name##_OFFSET)
+#define USART3_BFEXT(name,value)			\
+	(((value) >> USART3_##name##_OFFSET)		\
+	 & ((1 << USART3_##name##_SIZE) - 1))
+#define USART3_BFINS(name,value,old)			\
+	(((old) & ~(((1 << USART3_##name##_SIZE) - 1)	\
+		    << USART3_##name##_OFFSET))		\
+	 | USART3_BF(name,value))
+
+/* Register access macros */
+#define usart3_readl(port,reg)				\
+	__raw_readl((port)->regs + USART3_##reg)
+#define usart3_writel(port,reg,value)			\
+	__raw_writel((value), (port)->regs + USART3_##reg)
+
+#endif /* __ASM_AVR32_USART3_H__ */