ar71xx: add serial driver for the AR933X UART

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27065 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 1282 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/drivers/serial/ar933x_uart.c b/target/linux/ar71xx/files/drivers/serial/ar933x_uart.c
new file mode 100644
index 0000000000..ff0170fbb8
--- /dev/null
+++ b/target/linux/ar71xx/files/drivers/serial/ar933x_uart.c
@@ -0,0 +1,1282 @@
+/*
+ *  linux/drivers/serial/hornet_serial.c
+ *
+ *  Driver for hornet serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright (C) 2010 Ryan Hsu.
+ *
+ * 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.
+ *
+ *  $Id$
+ *
+ * A note about mapbase / membase
+ *
+ *  mapbase is the physical address of the IO port.
+ *  membase is an 'ioremapped' cookie.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_reg.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+#include <linux/nmi.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#include <asm/mach-ar71xx/ar933x_uart_platform.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include "8250.h"
+#define ar7240_reg_rmw_clear(_reg, _val)	do {} while (0)
+
+#define DRIVER_NAME "ar933x-uart"
+
+#define AR933X_UART_REGS_SIZE	20
+#define AR933X_UART_FIFO_SIZE	16
+
+/*
+ * Uart block
+ */
+#define UARTDATA_UARTTXCSR_MSB			9
+#define UARTDATA_UARTTXCSR_LSB			9
+#define UARTDATA_UARTTXCSR_MASK			0x00000200
+#define UARTDATA_UARTTXCSR_GET(x)		(((x) & UARTDATA_UARTTXCSR_MASK) >> UARTDATA_UARTTXCSR_LSB)
+#define UARTDATA_UARTTXCSR_SET(x)		(((0 | (x)) << UARTDATA_UARTTXCSR_LSB) & UARTDATA_UARTTXCSR_MASK)
+#define UARTDATA_UARTTXCSR_RESET		0
+#define UARTDATA_UARTRXCSR_MSB			8
+#define UARTDATA_UARTRXCSR_LSB			8
+#define UARTDATA_UARTRXCSR_MASK			0x00000100
+#define UARTDATA_UARTRXCSR_GET(x)		(((x) & UARTDATA_UARTRXCSR_MASK) >> UARTDATA_UARTRXCSR_LSB)
+#define UARTDATA_UARTRXCSR_SET(x)		(((0 | (x)) << UARTDATA_UARTRXCSR_LSB) & UARTDATA_UARTRXCSR_MASK)
+#define UARTDATA_UARTRXCSR_RESET		0
+#define UARTDATA_UARTTXRXDATA_MSB		7
+#define UARTDATA_UARTTXRXDATA_LSB		0
+#define UARTDATA_UARTTXRXDATA_MASK		0x000000ff
+#define UARTDATA_UARTTXRXDATA_GET(x)		(((x) & UARTDATA_UARTTXRXDATA_MASK) >> UARTDATA_UARTTXRXDATA_LSB)
+#define UARTDATA_UARTTXRXDATA_SET(x)		(((0 | (x)) << UARTDATA_UARTTXRXDATA_LSB) & UARTDATA_UARTTXRXDATA_MASK)
+#define UARTDATA_UARTTXRXDATA_RESET		0
+#define UARTDATA_ADDRESS			0x0000
+#define UARTDATA_HW_MASK			0x000003ff
+#define UARTDATA_SW_MASK			0x000003ff
+#define UARTDATA_RSTMASK			0x000003ff
+#define UARTDATA_RESET				0x00000000
+
+// 0x0004 (UARTCS)
+#define UARTCS_UARTRXBUSY_MSB			15
+#define UARTCS_UARTRXBUSY_LSB			15
+#define UARTCS_UARTRXBUSY_MASK			0x00008000
+#define UARTCS_UARTRXBUSY_GET(x)		(((x) & UARTCS_UARTRXBUSY_MASK) >> UARTCS_UARTRXBUSY_LSB)
+#define UARTCS_UARTRXBUSY_SET(x)		(((0 | (x)) << UARTCS_UARTRXBUSY_LSB) & UARTCS_UARTRXBUSY_MASK)
+#define UARTCS_UARTRXBUSY_RESET			0
+#define UARTCS_UARTTXBUSY_MSB			14
+#define UARTCS_UARTTXBUSY_LSB			14
+#define UARTCS_UARTTXBUSY_MASK			0x00004000
+#define UARTCS_UARTTXBUSY_GET(x)		(((x) & UARTCS_UARTTXBUSY_MASK) >> UARTCS_UARTTXBUSY_LSB)
+#define UARTCS_UARTTXBUSY_SET(x)		(((0 | (x)) << UARTCS_UARTTXBUSY_LSB) & UARTCS_UARTTXBUSY_MASK)
+#define UARTCS_UARTTXBUSY_RESET			0
+#define UARTCS_UARTHOSTINTEN_MSB		13
+#define UARTCS_UARTHOSTINTEN_LSB		13
+#define UARTCS_UARTHOSTINTEN_MASK		0x00002000
+#define UARTCS_UARTHOSTINTEN_GET(x)		(((x) & UARTCS_UARTHOSTINTEN_MASK) >> UARTCS_UARTHOSTINTEN_LSB)
+#define UARTCS_UARTHOSTINTEN_SET(x)		(((0 | (x)) << UARTCS_UARTHOSTINTEN_LSB) & UARTCS_UARTHOSTINTEN_MASK)
+#define UARTCS_UARTHOSTINTEN_RESET		0
+#define UARTCS_UARTHOSTINT_MSB			12
+#define UARTCS_UARTHOSTINT_LSB			12
+#define UARTCS_UARTHOSTINT_MASK			0x00001000
+#define UARTCS_UARTHOSTINT_GET(x)		(((x) & UARTCS_UARTHOSTINT_MASK) >> UARTCS_UARTHOSTINT_LSB)
+#define UARTCS_UARTHOSTINT_SET(x)		(((0 | (x)) << UARTCS_UARTHOSTINT_LSB) & UARTCS_UARTHOSTINT_MASK)
+#define UARTCS_UARTHOSTINT_RESET		0
+#define UARTCS_UARTTXBREAK_MSB			11
+#define UARTCS_UARTTXBREAK_LSB			11
+#define UARTCS_UARTTXBREAK_MASK			0x00000800
+#define UARTCS_UARTTXBREAK_GET(x)		(((x) & UARTCS_UARTTXBREAK_MASK) >> UARTCS_UARTTXBREAK_LSB)
+#define UARTCS_UARTTXBREAK_SET(x)		(((0 | (x)) << UARTCS_UARTTXBREAK_LSB) & UARTCS_UARTTXBREAK_MASK)
+#define UARTCS_UARTTXBREAK_RESET		0
+#define UARTCS_UARTRXBREAK_MSB			10
+#define UARTCS_UARTRXBREAK_LSB			10
+#define UARTCS_UARTRXBREAK_MASK			0x00000400
+#define UARTCS_UARTRXBREAK_GET(x)		(((x) & UARTCS_UARTRXBREAK_MASK) >> UARTCS_UARTRXBREAK_LSB)
+#define UARTCS_UARTRXBREAK_SET(x)		(((0 | (x)) << UARTCS_UARTRXBREAK_LSB) & UARTCS_UARTRXBREAK_MASK)
+#define UARTCS_UARTRXBREAK_RESET		0
+#define UARTCS_UARTSERIATXREADY_MSB		9
+#define UARTCS_UARTSERIATXREADY_LSB		9
+#define UARTCS_UARTSERIATXREADY_MASK		0x00000200
+#define UARTCS_UARTSERIATXREADY_GET(x)		(((x) & UARTCS_UARTSERIATXREADY_MASK) >> UARTCS_UARTSERIATXREADY_LSB)
+#define UARTCS_UARTSERIATXREADY_SET(x)		(((0 | (x)) << UARTCS_UARTSERIATXREADY_LSB) & UARTCS_UARTSERIATXREADY_MASK)
+#define UARTCS_UARTSERIATXREADY_RESET		0
+#define UARTCS_UARTTXREADYORIDE_MSB		8
+#define UARTCS_UARTTXREADYORIDE_LSB		8
+#define UARTCS_UARTTXREADYORIDE_MASK		0x00000100
+#define UARTCS_UARTTXREADYORIDE_GET(x)		(((x) & UARTCS_UARTTXREADYORIDE_MASK) >> UARTCS_UARTTXREADYORIDE_LSB)
+#define UARTCS_UARTTXREADYORIDE_SET(x)		(((0 | (x)) << UARTCS_UARTTXREADYORIDE_LSB) & UARTCS_UARTTXREADYORIDE_MASK)
+#define UARTCS_UARTTXREADYORIDE_RESET		0
+#define UARTCS_UARTRXREADYORIDE_MSB		7
+#define UARTCS_UARTRXREADYORIDE_LSB		7
+#define UARTCS_UARTRXREADYORIDE_MASK		0x00000080
+#define UARTCS_UARTRXREADYORIDE_GET(x)		(((x) & UARTCS_UARTRXREADYORIDE_MASK) >> UARTCS_UARTRXREADYORIDE_LSB)
+#define UARTCS_UARTRXREADYORIDE_SET(x)		(((0 | (x)) << UARTCS_UARTRXREADYORIDE_LSB) & UARTCS_UARTRXREADYORIDE_MASK)
+#define UARTCS_UARTRXREADYORIDE_RESET		0
+#define UARTCS_UARTDMAEN_MSB			6
+#define UARTCS_UARTDMAEN_LSB			6
+#define UARTCS_UARTDMAEN_MASK			0x00000040
+#define UARTCS_UARTDMAEN_GET(x)			(((x) & UARTCS_UARTDMAEN_MASK) >> UARTCS_UARTDMAEN_LSB)
+#define UARTCS_UARTDMAEN_SET(x)			(((0 | (x)) << UARTCS_UARTDMAEN_LSB) & UARTCS_UARTDMAEN_MASK)
+#define UARTCS_UARTDMAEN_RESET			0
+#define UARTCS_UARTFLOWCONTROLMODE_MSB		5
+#define UARTCS_UARTFLOWCONTROLMODE_LSB		4
+#define UARTCS_UARTFLOWCONTROLMODE_MASK		0x00000030
+#define UARTCS_UARTFLOWCONTROLMODE_GET(x)	(((x) & UARTCS_UARTFLOWCONTROLMODE_MASK) >> UARTCS_UARTFLOWCONTROLMODE_LSB)
+#define UARTCS_UARTFLOWCONTROLMODE_SET(x)	(((0 | (x)) << UARTCS_UARTFLOWCONTROLMODE_LSB) & UARTCS_UARTFLOWCONTROLMODE_MASK)
+#define UARTCS_UARTFLOWCONTROLMODE_RESET	0
+#define UARTCS_UARTINTERFACEMODE_MSB		3
+#define UARTCS_UARTINTERFACEMODE_LSB		2
+#define UARTCS_UARTINTERFACEMODE_MASK		0x0000000c
+#define UARTCS_UARTINTERFACEMODE_GET(x)		(((x) & UARTCS_UARTINTERFACEMODE_MASK) >> UARTCS_UARTINTERFACEMODE_LSB)
+#define UARTCS_UARTINTERFACEMODE_SET(x)		(((0 | (x)) << UARTCS_UARTINTERFACEMODE_LSB) & UARTCS_UARTINTERFACEMODE_MASK)
+#define UARTCS_UARTINTERFACEMODE_RESET		0
+#define UARTCS_UARTPARITYMODE_MSB		1
+#define UARTCS_UARTPARITYMODE_LSB		0
+#define UARTCS_UARTPARITYMODE_MASK		0x00000003
+#define UARTCS_UARTPARITYMODE_GET(x)		(((x) & UARTCS_UARTPARITYMODE_MASK) >> UARTCS_UARTPARITYMODE_LSB)
+#define UARTCS_UARTPARITYMODE_SET(x)		(((0 | (x)) << UARTCS_UARTPARITYMODE_LSB) & UARTCS_UARTPARITYMODE_MASK)
+#define UARTCS_UARTPARITYMODE_RESET		0
+#define UARTCS_ADDRESS				0x0004
+#define UARTCS_HW_MASK				0x0000ffff
+#define UARTCS_SW_MASK				0x0000ffff
+#define UARTCS_RSTMASK				0x000029ff
+#define UARTCS_RESET				0x00000000
+
+// 0x0008 (UARTCLOCK)
+#define UARTCLOCK_UARTCLOCKSCALE_MSB		23
+#define UARTCLOCK_UARTCLOCKSCALE_LSB		16
+#define UARTCLOCK_UARTCLOCKSCALE_MASK		0x00ff0000
+#define UARTCLOCK_UARTCLOCKSCALE_GET(x)		(((x) & UARTCLOCK_UARTCLOCKSCALE_MASK) >> UARTCLOCK_UARTCLOCKSCALE_LSB)
+#define UARTCLOCK_UARTCLOCKSCALE_SET(x)		(((0 | (x)) << UARTCLOCK_UARTCLOCKSCALE_LSB) & UARTCLOCK_UARTCLOCKSCALE_MASK)
+#define UARTCLOCK_UARTCLOCKSCALE_RESET		0
+#define UARTCLOCK_UARTCLOCKSTEP_MSB		15
+#define UARTCLOCK_UARTCLOCKSTEP_LSB		0
+#define UARTCLOCK_UARTCLOCKSTEP_MASK		0x0000ffff
+#define UARTCLOCK_UARTCLOCKSTEP_GET(x)		(((x) & UARTCLOCK_UARTCLOCKSTEP_MASK) >> UARTCLOCK_UARTCLOCKSTEP_LSB)
+#define UARTCLOCK_UARTCLOCKSTEP_SET(x)		(((0 | (x)) << UARTCLOCK_UARTCLOCKSTEP_LSB) & UARTCLOCK_UARTCLOCKSTEP_MASK)
+#define UARTCLOCK_UARTCLOCKSTEP_RESET		0
+#define UARTCLOCK_ADDRESS			0x0008
+#define UARTCLOCK_HW_MASK			0x00ffffff
+#define UARTCLOCK_SW_MASK			0x00ffffff
+#define UARTCLOCK_RSTMASK			0x00ffffff
+#define UARTCLOCK_RESET				0x00000000
+
+// 0x000c (UARTINT)
+#define UARTINT_UARTTXEMPTYINT_MSB		9
+#define UARTINT_UARTTXEMPTYINT_LSB		9
+#define UARTINT_UARTTXEMPTYINT_MASK		0x00000200
+#define UARTINT_UARTTXEMPTYINT_GET(x)		(((x) & UARTINT_UARTTXEMPTYINT_MASK) >> UARTINT_UARTTXEMPTYINT_LSB)
+#define UARTINT_UARTTXEMPTYINT_SET(x)		(((0 | (x)) << UARTINT_UARTTXEMPTYINT_LSB) & UARTINT_UARTTXEMPTYINT_MASK)
+#define UARTINT_UARTTXEMPTYINT_RESET		0
+#define UARTINT_UARTRXFULLINT_MSB		8
+#define UARTINT_UARTRXFULLINT_LSB		8
+#define UARTINT_UARTRXFULLINT_MASK		0x00000100
+#define UARTINT_UARTRXFULLINT_GET(x)		(((x) & UARTINT_UARTRXFULLINT_MASK) >> UARTINT_UARTRXFULLINT_LSB)
+#define UARTINT_UARTRXFULLINT_SET(x)		(((0 | (x)) << UARTINT_UARTRXFULLINT_LSB) & UARTINT_UARTRXFULLINT_MASK)
+#define UARTINT_UARTRXFULLINT_RESET		0
+#define UARTINT_UARTRXBREAKOFFINT_MSB		7
+#define UARTINT_UARTRXBREAKOFFINT_LSB		7
+#define UARTINT_UARTRXBREAKOFFINT_MASK		0x00000080
+#define UARTINT_UARTRXBREAKOFFINT_GET(x)	(((x) & UARTINT_UARTRXBREAKOFFINT_MASK) >> UARTINT_UARTRXBREAKOFFINT_LSB)
+#define UARTINT_UARTRXBREAKOFFINT_SET(x)	(((0 | (x)) << UARTINT_UARTRXBREAKOFFINT_LSB) & UARTINT_UARTRXBREAKOFFINT_MASK)
+#define UARTINT_UARTRXBREAKOFFINT_RESET		0
+#define UARTINT_UARTRXBREAKONINT_MSB		6
+#define UARTINT_UARTRXBREAKONINT_LSB		6
+#define UARTINT_UARTRXBREAKONINT_MASK		0x00000040
+#define UARTINT_UARTRXBREAKONINT_GET(x)		(((x) & UARTINT_UARTRXBREAKONINT_MASK) >> UARTINT_UARTRXBREAKONINT_LSB)
+#define UARTINT_UARTRXBREAKONINT_SET(x)		(((0 | (x)) << UARTINT_UARTRXBREAKONINT_LSB) & UARTINT_UARTRXBREAKONINT_MASK)
+#define UARTINT_UARTRXBREAKONINT_RESET		0
+#define UARTINT_UARTRXPARITYERRINT_MSB		5
+#define UARTINT_UARTRXPARITYERRINT_LSB		5
+#define UARTINT_UARTRXPARITYERRINT_MASK		0x00000020
+#define UARTINT_UARTRXPARITYERRINT_GET(x)	(((x) & UARTINT_UARTRXPARITYERRINT_MASK) >> UARTINT_UARTRXPARITYERRINT_LSB)
+#define UARTINT_UARTRXPARITYERRINT_SET(x)	(((0 | (x)) << UARTINT_UARTRXPARITYERRINT_LSB) & UARTINT_UARTRXPARITYERRINT_MASK)
+#define UARTINT_UARTRXPARITYERRINT_RESET	0
+#define UARTINT_UARTTXOFLOWERRINT_MSB		4
+#define UARTINT_UARTTXOFLOWERRINT_LSB		4
+#define UARTINT_UARTTXOFLOWERRINT_MASK		0x00000010
+#define UARTINT_UARTTXOFLOWERRINT_GET(x)	(((x) & UARTINT_UARTTXOFLOWERRINT_MASK) >> UARTINT_UARTTXOFLOWERRINT_LSB)
+#define UARTINT_UARTTXOFLOWERRINT_SET(x)	(((0 | (x)) << UARTINT_UARTTXOFLOWERRINT_LSB) & UARTINT_UARTTXOFLOWERRINT_MASK)
+#define UARTINT_UARTTXOFLOWERRINT_RESET		0
+#define UARTINT_UARTRXOFLOWERRINT_MSB		3
+#define UARTINT_UARTRXOFLOWERRINT_LSB		3
+#define UARTINT_UARTRXOFLOWERRINT_MASK		0x00000008
+#define UARTINT_UARTRXOFLOWERRINT_GET(x)	(((x) & UARTINT_UARTRXOFLOWERRINT_MASK) >> UARTINT_UARTRXOFLOWERRINT_LSB)
+#define UARTINT_UARTRXOFLOWERRINT_SET(x)	(((0 | (x)) << UARTINT_UARTRXOFLOWERRINT_LSB) & UARTINT_UARTRXOFLOWERRINT_MASK)
+#define UARTINT_UARTRXOFLOWERRINT_RESET		0
+#define UARTINT_UARTRXFRAMINGERRINT_MSB		2
+#define UARTINT_UARTRXFRAMINGERRINT_LSB		2
+#define UARTINT_UARTRXFRAMINGERRINT_MASK	0x00000004
+#define UARTINT_UARTRXFRAMINGERRINT_GET(x)	(((x) & UARTINT_UARTRXFRAMINGERRINT_MASK) >> UARTINT_UARTRXFRAMINGERRINT_LSB)
+#define UARTINT_UARTRXFRAMINGERRINT_SET(x)	(((0 | (x)) << UARTINT_UARTRXFRAMINGERRINT_LSB) & UARTINT_UARTRXFRAMINGERRINT_MASK)
+#define UARTINT_UARTRXFRAMINGERRINT_RESET	0
+#define UARTINT_UARTTXREADYINT_MSB		1
+#define UARTINT_UARTTXREADYINT_LSB		1
+#define UARTINT_UARTTXREADYINT_MASK		0x00000002
+#define UARTINT_UARTTXREADYINT_GET(x)		(((x) & UARTINT_UARTTXREADYINT_MASK) >> UARTINT_UARTTXREADYINT_LSB)
+#define UARTINT_UARTTXREADYINT_SET(x)		(((0 | (x)) << UARTINT_UARTTXREADYINT_LSB) & UARTINT_UARTTXREADYINT_MASK)
+#define UARTINT_UARTTXREADYINT_RESET		0
+#define UARTINT_UARTRXVALIDINT_MSB		0
+#define UARTINT_UARTRXVALIDINT_LSB		0
+#define UARTINT_UARTRXVALIDINT_MASK		0x00000001
+#define UARTINT_UARTRXVALIDINT_GET(x)		(((x) & UARTINT_UARTRXVALIDINT_MASK) >> UARTINT_UARTRXVALIDINT_LSB)
+#define UARTINT_UARTRXVALIDINT_SET(x)		(((0 | (x)) << UARTINT_UARTRXVALIDINT_LSB) & UARTINT_UARTRXVALIDINT_MASK)
+#define UARTINT_UARTRXVALIDINT_RESET		0
+#define UARTINT_ADDRESS				0x000c
+#define UARTINT_HW_MASK				0x000003ff
+#define UARTINT_SW_MASK				0x000003ff
+#define UARTINT_RSTMASK				0x000003ff
+#define UARTINT_RESET				0x00000000
+
+// 0x0010 (UARTINTEN)
+#define UARTINTEN_UARTTXEMPTYINTEN_MSB		9
+#define UARTINTEN_UARTTXEMPTYINTEN_LSB		9
+#define UARTINTEN_UARTTXEMPTYINTEN_MASK		0x00000200
+#define UARTINTEN_UARTTXEMPTYINTEN_GET(x)	(((x) & UARTINTEN_UARTTXEMPTYINTEN_MASK) >> UARTINTEN_UARTTXEMPTYINTEN_LSB)
+#define UARTINTEN_UARTTXEMPTYINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTTXEMPTYINTEN_LSB) & UARTINTEN_UARTTXEMPTYINTEN_MASK)
+#define UARTINTEN_UARTTXEMPTYINTEN_RESET	0
+#define UARTINTEN_UARTRXFULLINTEN_MSB		8
+#define UARTINTEN_UARTRXFULLINTEN_LSB		8
+#define UARTINTEN_UARTRXFULLINTEN_MASK		0x00000100
+#define UARTINTEN_UARTRXFULLINTEN_GET(x)	(((x) & UARTINTEN_UARTRXFULLINTEN_MASK) >> UARTINTEN_UARTRXFULLINTEN_LSB)
+#define UARTINTEN_UARTRXFULLINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTRXFULLINTEN_LSB) & UARTINTEN_UARTRXFULLINTEN_MASK)
+#define UARTINTEN_UARTRXFULLINTEN_RESET		0
+#define UARTINTEN_UARTRXBREAKOFFINTEN_MSB	7
+#define UARTINTEN_UARTRXBREAKOFFINTEN_LSB	7
+#define UARTINTEN_UARTRXBREAKOFFINTEN_MASK	0x00000080
+#define UARTINTEN_UARTRXBREAKOFFINTEN_GET(x)	(((x) & UARTINTEN_UARTRXBREAKOFFINTEN_MASK) >> UARTINTEN_UARTRXBREAKOFFINTEN_LSB)
+#define UARTINTEN_UARTRXBREAKOFFINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTRXBREAKOFFINTEN_LSB) & UARTINTEN_UARTRXBREAKOFFINTEN_MASK)
+#define UARTINTEN_UARTRXBREAKOFFINTEN_RESET	0
+#define UARTINTEN_UARTRXBREAKONINTEN_MSB	6
+#define UARTINTEN_UARTRXBREAKONINTEN_LSB	6
+#define UARTINTEN_UARTRXBREAKONINTEN_MASK	0x00000040
+#define UARTINTEN_UARTRXBREAKONINTEN_GET(x)	(((x) & UARTINTEN_UARTRXBREAKONINTEN_MASK) >> UARTINTEN_UARTRXBREAKONINTEN_LSB)
+#define UARTINTEN_UARTRXBREAKONINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTRXBREAKONINTEN_LSB) & UARTINTEN_UARTRXBREAKONINTEN_MASK)
+#define UARTINTEN_UARTRXBREAKONINTEN_RESET	0
+#define UARTINTEN_UARTRXPARITYERRINTEN_MSB	5
+#define UARTINTEN_UARTRXPARITYERRINTEN_LSB	5
+#define UARTINTEN_UARTRXPARITYERRINTEN_MASK	0x00000020
+#define UARTINTEN_UARTRXPARITYERRINTEN_GET(x)	(((x) & UARTINTEN_UARTRXPARITYERRINTEN_MASK) >> UARTINTEN_UARTRXPARITYERRINTEN_LSB)
+#define UARTINTEN_UARTRXPARITYERRINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTRXPARITYERRINTEN_LSB) & UARTINTEN_UARTRXPARITYERRINTEN_MASK)
+#define UARTINTEN_UARTRXPARITYERRINTEN_RESET	0
+#define UARTINTEN_UARTTXOFLOWERRINTEN_MSB	4
+#define UARTINTEN_UARTTXOFLOWERRINTEN_LSB	4
+#define UARTINTEN_UARTTXOFLOWERRINTEN_MASK	0x00000010
+#define UARTINTEN_UARTTXOFLOWERRINTEN_GET(x)	(((x) & UARTINTEN_UARTTXOFLOWERRINTEN_MASK) >> UARTINTEN_UARTTXOFLOWERRINTEN_LSB)
+#define UARTINTEN_UARTTXOFLOWERRINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTTXOFLOWERRINTEN_LSB) & UARTINTEN_UARTTXOFLOWERRINTEN_MASK)
+#define UARTINTEN_UARTTXOFLOWERRINTEN_RESET	0
+#define UARTINTEN_UARTRXOFLOWERRINTEN_MSB	3
+#define UARTINTEN_UARTRXOFLOWERRINTEN_LSB	3
+#define UARTINTEN_UARTRXOFLOWERRINTEN_MASK	0x00000008
+#define UARTINTEN_UARTRXOFLOWERRINTEN_GET(x)	(((x) & UARTINTEN_UARTRXOFLOWERRINTEN_MASK) >> UARTINTEN_UARTRXOFLOWERRINTEN_LSB)
+#define UARTINTEN_UARTRXOFLOWERRINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTRXOFLOWERRINTEN_LSB) & UARTINTEN_UARTRXOFLOWERRINTEN_MASK)
+#define UARTINTEN_UARTRXOFLOWERRINTEN_RESET	0
+#define UARTINTEN_UARTRXFRAMINGERRINTEN_MSB	2
+#define UARTINTEN_UARTRXFRAMINGERRINTEN_LSB	2
+#define UARTINTEN_UARTRXFRAMINGERRINTEN_MASK	0x00000004
+#define UARTINTEN_UARTRXFRAMINGERRINTEN_GET(x)	(((x) & UARTINTEN_UARTRXFRAMINGERRINTEN_MASK) >> UARTINTEN_UARTRXFRAMINGERRINTEN_LSB)
+#define UARTINTEN_UARTRXFRAMINGERRINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTRXFRAMINGERRINTEN_LSB) & UARTINTEN_UARTRXFRAMINGERRINTEN_MASK)
+#define UARTINTEN_UARTRXFRAMINGERRINTEN_RESET	0
+#define UARTINTEN_UARTTXREADYINTEN_MSB		1
+#define UARTINTEN_UARTTXREADYINTEN_LSB		1
+#define UARTINTEN_UARTTXREADYINTEN_MASK		0x00000002
+#define UARTINTEN_UARTTXREADYINTEN_GET(x)	(((x) & UARTINTEN_UARTTXREADYINTEN_MASK) >> UARTINTEN_UARTTXREADYINTEN_LSB)
+#define UARTINTEN_UARTTXREADYINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTTXREADYINTEN_LSB) & UARTINTEN_UARTTXREADYINTEN_MASK)
+#define UARTINTEN_UARTTXREADYINTEN_RESET	0
+#define UARTINTEN_UARTRXVALIDINTEN_MSB		0
+#define UARTINTEN_UARTRXVALIDINTEN_LSB		0
+#define UARTINTEN_UARTRXVALIDINTEN_MASK		0x00000001
+#define UARTINTEN_UARTRXVALIDINTEN_GET(x)	(((x) & UARTINTEN_UARTRXVALIDINTEN_MASK) >> UARTINTEN_UARTRXVALIDINTEN_LSB)
+#define UARTINTEN_UARTRXVALIDINTEN_SET(x)	(((0 | (x)) << UARTINTEN_UARTRXVALIDINTEN_LSB) & UARTINTEN_UARTRXVALIDINTEN_MASK)
+#define UARTINTEN_UARTRXVALIDINTEN_RESET	0
+#define UARTINTEN_ADDRESS			0x0010
+#define UARTINTEN_HW_MASK			0x000003ff
+#define UARTINTEN_SW_MASK			0x000003ff
+#define UARTINTEN_RSTMASK			0x000003ff
+#define UARTINTEN_RESET				0x00000000
+
+/*
+ * uncomment below to enable WAR for EV81847.
+ */
+//#define AR933X_EV81847_WAR
+
+static struct uart_driver ar933x_uart_driver;
+
+/*
+ * 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
+
+/*
+ * 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)
+
+#include <asm/serial.h>
+
+struct ar933x_uart_port {
+	struct uart_port	port;
+	struct timer_list	timer;		/* "no irq" timer */
+	unsigned char		acr;
+	unsigned char		ier;
+	unsigned char		lcr;
+	unsigned char		mcr;
+};
+
+static inline int ar933x_ev81847_war(void)
+{
+#if defined(AR933X_EV81847_WAR)
+	return 1;
+#else
+	return 0;
+#endif
+}
+
+static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
+					    int offset)
+{
+	return readl(up->port.membase + offset);
+}
+
+static inline void ar933x_uart_write(struct ar933x_uart_port *up,
+				     int offset, unsigned int value)
+{
+	writel(value, up->port.membase + offset);
+}
+
+static inline void ar933x_uart_rmw(struct ar933x_uart_port *up,
+				  unsigned int offset,
+				  unsigned int mask,
+				  unsigned int val)
+{
+	unsigned int t;
+
+	t = ar933x_uart_read(up, offset);
+	t &= ~mask;
+	t |= val;
+	ar933x_uart_write(up, offset, t);
+}
+
+static inline void ar933x_uart_rmw_set(struct ar933x_uart_port *up,
+				       unsigned int offset,
+				       unsigned int val)
+{
+	ar933x_uart_rmw(up, offset, 0, val);
+}
+
+static inline void ar933x_uart_rmw_clear(struct ar933x_uart_port *up,
+					 unsigned int offset,
+					 unsigned int val)
+{
+	ar933x_uart_rmw(up, offset, val, 0);
+}
+
+static inline void ar933x_uart_start_tx_interrupt(struct ar933x_uart_port *up)
+{
+	ar933x_uart_rmw_set(up, UARTINTEN_ADDRESS,
+			    UARTINTEN_UARTTXEMPTYINTEN_SET(1));
+}
+
+static inline void ar933x_uart_stop_tx_interrupt(struct ar933x_uart_port *up)
+{
+	if (up->ier & UART_IER_THRI) {
+		up->ier &= ~UART_IER_THRI;
+
+		/* FIXME: why this uses RXVALIDINTEN? */
+		ar933x_uart_rmw_clear(up, UARTINTEN_ADDRESS,
+				      UARTINTEN_UARTRXVALIDINTEN_SET(1));
+	}
+}
+
+static unsigned int ar933x_uart_tx_empty(struct uart_port *port)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+	unsigned long flags;
+	unsigned int rdata;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	rdata = ar933x_uart_read(up, UARTDATA_ADDRESS);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	return (rdata & UARTDATA_UARTTXCSR_MASK) ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int ar933x_uart_get_mctrl(struct uart_port *port)
+{
+	return TIOCM_CAR;
+}
+
+static void ar933x_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+static void ar933x_uart_start_tx(struct uart_port *port)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+
+	ar933x_uart_start_tx_interrupt(up);
+}
+
+static void ar933x_uart_stop_tx(struct uart_port *port)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+
+	ar933x_uart_stop_tx_interrupt(up);
+}
+
+static void ar933x_uart_stop_rx(struct uart_port *port)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+
+	up->ier &= ~UART_IER_RLSI;
+	up->port.read_status_mask &= ~UART_LSR_DR;
+
+	ar933x_uart_rmw_clear(up, UARTINTEN_ADDRESS,
+			      UARTINTEN_UARTRXVALIDINTEN_SET(1));
+}
+
+static void ar933x_uart_break_ctl(struct uart_port *port, int break_state)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+	unsigned long flags;
+	unsigned long rdata;
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	if (break_state == -1)
+		up->lcr |= UART_LCR_SBC;
+	else
+		up->lcr &= ~UART_LCR_SBC;
+
+	rdata = ar933x_uart_read(up, UARTCS_ADDRESS);
+	if (up->lcr & UART_LCR_SBC)
+		rdata |= UARTCS_UARTTXBREAK_SET(1);
+	else
+		rdata &= ~UARTCS_UARTTXBREAK_SET(1);
+
+	ar933x_uart_write(up, UARTCS_ADDRESS, rdata);
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void ar933x_uart_enable_ms(struct uart_port *port)
+{
+}
+
+static inline unsigned int ar933x_uart_get_divisor(struct uart_port *port,
+						   unsigned int baud)
+{
+	return (port->uartclk / (16 * baud)) - 1;
+}
+
+static void ar933x_uart_set_termios(struct uart_port *port,
+				    struct ktermios *termios,
+				    struct ktermios *old)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+	unsigned char cval;
+	unsigned long flags;
+	unsigned int baud, quot;
+
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		cval = UART_LCR_WLEN5;
+		break;
+	case CS6:
+		cval = UART_LCR_WLEN6;
+		break;
+	case CS7:
+		cval = UART_LCR_WLEN7;
+		break;
+	default:
+	case CS8:
+		cval = UART_LCR_WLEN8;
+		break;
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		cval |= UART_LCR_STOP;
+	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 = ar933x_uart_get_divisor(port, baud);
+
+#if 0
+	if (up->capabilities & UART_CAP_FIFO && up->port.fifosize > 1) {
+		if (baud < 2400)
+			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
+		else
+			fcr = uart_config[up->port.type].fcr;
+	}
+
+	/*
+	 * MCR-based auto flow control.  When AFE is enabled, RTS will be
+	 * deasserted when the receive FIFO contains more characters than
+	 * the trigger, or the MCR RTS bit is cleared.  In the case where
+	 * the remote UART is not using CTS auto flow control, we must
+	 * have sufficient FIFO entries for the latency of the remote
+	 * UART to respond.  IOW, at least 32 bytes of FIFO.
+	 */
+	if (up->capabilities & UART_CAP_AFE && up->port.fifosize >= 32) {
+		up->mcr &= ~UART_MCR_AFE;
+		if (termios->c_cflag & CRTSCTS)
+			up->mcr |= UART_MCR_AFE;
+	}
+#endif
+
+	/*
+	 * 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;
+
+	ar933x_uart_rmw_set(up, UARTCS_ADDRESS,
+			    UARTCS_UARTHOSTINTEN_SET(1));
+
+	/* Save LCR */
+	up->lcr = cval;
+
+	ar933x_uart_set_mctrl(&up->port, up->port.mctrl);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void ar933x_uart_rx_chars(struct ar933x_uart_port *up, int *status)
+{
+	struct tty_struct *tty = up->port.state->port.tty;
+	unsigned int lsr = *status;
+	unsigned char ch;
+	int max_count = 256;
+	char flag;
+
+	do {
+		ch = (unsigned char)UARTDATA_UARTTXRXDATA_GET(lsr);
+
+		flag = TTY_NORMAL;
+		up->port.icount.rx++;
+
+		lsr = UARTDATA_UARTRXCSR_SET(1);
+		ar933x_uart_write(up, UARTDATA_ADDRESS, lsr);
+
+		if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE |
+				    UART_LSR_FE | UART_LSR_OE))) {
+			/*
+			 * For statistics only
+			 */
+			if (lsr & UART_LSR_BI) {
+				lsr &= ~(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 (lsr & UART_LSR_PE)
+				up->port.icount.parity++;
+			else if (lsr & UART_LSR_FE)
+				up->port.icount.frame++;
+			if (lsr & UART_LSR_OE)
+				up->port.icount.overrun++;
+
+			/*
+			 * Mask off conditions which should be ignored.
+			 */
+			lsr &= up->port.read_status_mask;
+
+			if (lsr & UART_LSR_BI) {
+				DEBUG_INTR("handling break....");
+				flag = TTY_BREAK;
+			} else if (lsr & UART_LSR_PE)
+				flag = TTY_PARITY;
+			else if (lsr & UART_LSR_FE)
+				flag = TTY_FRAME;
+		}
+
+		if (uart_handle_sysrq_char(&up->port, ch))
+			goto ignore_char;
+
+		uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
+
+ignore_char:
+		lsr = ar933x_uart_read(up, UARTDATA_ADDRESS);
+	} while ((lsr & UARTDATA_UARTRXCSR_MASK) && (max_count-- > 0));
+
+	spin_unlock(&up->port.lock);
+	tty_flip_buffer_push(tty);
+	spin_lock(&up->port.lock);
+
+	*status = lsr;
+}
+
+static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
+{
+	struct circ_buf *xmit = &up->port.state->xmit;
+	int count;
+	unsigned int rdata;
+
+	rdata = ar933x_uart_read(up, UARTDATA_ADDRESS);
+	if (UARTDATA_UARTTXCSR_GET(rdata) == 0) {
+		ar933x_uart_start_tx_interrupt(up);
+		return;
+	}
+
+	if (up->port.x_char) {
+		rdata = UARTDATA_UARTTXRXDATA_SET((unsigned int)(up->port.x_char));
+		rdata |= UARTDATA_UARTTXCSR_SET(1);
+		ar933x_uart_write(up, UARTDATA_ADDRESS, rdata);
+		up->port.icount.tx++;
+		up->port.x_char = 0;
+		ar933x_uart_start_tx_interrupt(up);
+		return;
+	}
+
+	if (uart_tx_stopped(&up->port)) {
+		ar933x_uart_stop_tx(&up->port);
+		return;
+	}
+
+	if (uart_circ_empty(xmit)) {
+		ar933x_uart_stop_tx_interrupt(up);
+		return;
+	}
+
+	count = up->port.fifosize / 4;
+	do {
+		rdata = ar933x_uart_read(up, UARTDATA_ADDRESS);
+		if (UARTDATA_UARTTXCSR_GET(rdata) == 0) {
+			ar933x_uart_start_tx_interrupt(up);
+			return;
+		}
+
+		rdata = UARTDATA_UARTTXRXDATA_SET((unsigned int)(xmit->buf[xmit->tail]));
+		rdata |= UARTDATA_UARTTXCSR_SET(1);
+		ar933x_uart_write(up, UARTDATA_ADDRESS, rdata);
+
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		up->port.icount.tx++;
+		if (uart_circ_empty(xmit))
+			break;
+	} while (--count > 0);
+
+	rdata = ar933x_uart_read(up, UARTDATA_ADDRESS);
+	if (UARTDATA_UARTTXCSR_GET(rdata) == 0) {
+		ar933x_uart_start_tx_interrupt(up);
+		return;
+	}
+
+	/* Re-enable TX Empty Interrupt to transmit pending chars */
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
+		uart_write_wakeup(&up->port);
+		ar933x_uart_start_tx_interrupt(up);
+	}
+
+	DEBUG_INTR("THRE...");
+
+	if (uart_circ_empty(xmit))
+		ar933x_uart_stop_tx_interrupt(up);
+	else
+		ar933x_uart_start_tx_interrupt(up);
+}
+
+/*! Hornet's interrupt status is not read clear, so that we have to...
+ * a. read out the interrupt status
+ * b. clear the interrupt mask to reset the interrupt status
+ * c. enable the interrupt to reactivate interrupt
+ *
+ * Disable and clear the interrupt status
+ */
+static inline void ar933x_uart_clear_int(struct ar933x_uart_port *up)
+{
+#define BIT3 (0x1>>3)
+
+	/* 1. clear MISC interrupt mask */
+	//ar7240_reg_rmw_clear(AR7240_MISC_INT_MASK, BIT3);
+
+	/* 2. clear uartcs hostinten mask, bit13 */
+	ar933x_uart_rmw_clear(up, UARTCS_ADDRESS,
+			      UARTCS_UARTHOSTINTEN_SET(1));
+
+	/* 3. clear rx uartint */
+	ar933x_uart_write(up, UARTINT_ADDRESS, UARTINT_UARTRXVALIDINT_SET(1));
+
+	/* 4. clear misc interrupt status  */
+	ar7240_reg_rmw_clear(AR7240_MISC_INT_STATUS, BIT3);
+
+	/* 5. clear rx uartinten*/
+	ar933x_uart_rmw_clear(up, UARTINTEN_ADDRESS,
+			      UARTINTEN_UARTRXVALIDINTEN_SET(1));
+
+	/* 6. enable rx int*/
+	ar933x_uart_rmw_set(up, UARTINTEN_ADDRESS,
+			    UARTINTEN_UARTRXVALIDINTEN_SET(1));
+
+	/* 7. set uartcs hostinten mask */
+	ar933x_uart_rmw_set(up, UARTCS_ADDRESS,
+			    UARTCS_UARTHOSTINTEN_SET(1));
+
+	/* 8. set misc int mask */
+	//ar7240_reg_wr(AR7240_MISC_INT_MASK, BIT3);
+}
+
+static inline void ar933x_uart_handle_port(struct ar933x_uart_port *up)
+{
+	unsigned int status;
+	unsigned int int_status;
+	unsigned int en_status;
+	unsigned long flags;
+
+	status = ar933x_uart_read(up, UARTDATA_ADDRESS);
+	int_status = ar933x_uart_read(up, UARTINT_ADDRESS);
+	en_status = ar933x_uart_read(up, UARTINTEN_ADDRESS);
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	if( (int_status & en_status) & UARTINT_UARTRXVALIDINT_MASK )
+		ar933x_uart_rx_chars(up, &status);
+
+	if (((int_status & en_status) & UARTINT_UARTTXEMPTYINT_MASK)) {
+		/* clear TX empty interrupts */
+		ar933x_uart_write(up, UARTINT_ADDRESS,
+				  UARTINT_UARTTXEMPTYINT_SET(1));
+
+		/* disable TX empty interrupts */
+		ar933x_uart_rmw_clear(up, UARTINTEN_ADDRESS,
+				      UARTINTEN_UARTTXEMPTYINTEN_SET(1));
+
+		if (!uart_circ_empty(&up->port.state->xmit))
+			ar933x_uart_tx_chars(up);
+	}
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id)
+{
+	struct ar933x_uart_port *up;
+	unsigned int iir;
+
+	up = (struct ar933x_uart_port *) dev_id;
+
+	iir = ar933x_uart_read(up, UARTCS_ADDRESS);
+	if ((iir & UARTCS_UARTHOSTINT_MASK) == 0)
+		return IRQ_NONE;
+
+	DEBUG_INTR("ar933x_uart_interrupt(%d)...", irq);
+
+	spin_lock(&up->port.lock);
+	ar933x_uart_handle_port(up);
+	ar933x_uart_clear_int(up);
+	spin_unlock(&up->port.lock);
+
+	DEBUG_INTR("end.\n");
+
+	return IRQ_HANDLED;
+}
+
+static void ar933x_uart_timer(unsigned long data)
+{
+	struct uart_port *port = (void *)data;
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+	unsigned int iir;
+
+	if (ar933x_ev81847_war()) {
+		struct circ_buf *xmit = &up->port.state->xmit;
+		unsigned long flags;
+
+		if (!uart_circ_empty(xmit)) {
+			spin_lock_irqsave(&up->port.lock, flags);
+			ar933x_uart_tx_chars(up);
+			spin_unlock_irqrestore(&up->port.lock, flags);
+		}
+	} else {
+		iir = ar933x_uart_read(up, UARTCS_ADDRESS);
+		if (iir & UARTCS_UARTHOSTINT_MASK) {
+			spin_lock(&up->port.lock);
+			ar933x_uart_handle_port(up);
+			spin_unlock(&up->port.lock);
+		}
+	}
+
+	mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
+}
+
+static int ar933x_uart_startup(struct uart_port *port)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+	unsigned long flags;
+	int ret;
+
+	ret = request_irq(up->port.irq, ar933x_uart_interrupt,
+			  up->port.irqflags, dev_name(up->port.dev), up);
+	if (ret)
+		return ret;
+
+	up->mcr = 0;
+
+	/*
+	 * Clear the interrupt registers.
+	 */
+	ar933x_uart_read(up, UARTCS_ADDRESS);
+	ar933x_uart_read(up, UARTINT_ADDRESS);
+
+	if (!is_real_interrupt(up->port.irq) || ar933x_ev81847_war()) {
+		setup_timer(&up->timer, ar933x_uart_timer, (unsigned long)port);
+		mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
+		return 0;
+	}
+
+	spin_lock_irqsave(&up->port.lock, flags);
+
+	/*
+	 * Enable host interrupts
+	 */
+	ar933x_uart_rmw_set(up, UARTCS_ADDRESS,
+			    UARTCS_UARTHOSTINTEN_SET(1));
+
+	/*
+	 * Enable RX interrupts
+	 */
+	up->ier = UART_IER_RLSI | UART_IER_RDI;
+	ar933x_uart_write(up, UARTINTEN_ADDRESS,
+			  UARTINTEN_UARTRXVALIDINTEN_SET(1));
+
+	/*
+	 * And clear the interrupt registers again for luck.
+	 */
+	ar933x_uart_read(up, UARTINT_ADDRESS);
+
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	return 0;
+}
+
+static void ar933x_uart_shutdown(struct uart_port *port)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+	unsigned long flags;
+
+	/*
+	 * Disable all interrupts from this port
+	 */
+	up->ier = 0;
+	ar933x_uart_write(up, UARTINTEN_ADDRESS, 0);
+
+	spin_lock_irqsave(&up->port.lock, flags);
+	up->port.mctrl &= ~TIOCM_OUT2;
+	ar933x_uart_set_mctrl(&up->port, up->port.mctrl);
+	spin_unlock_irqrestore(&up->port.lock, flags);
+
+	/*
+	 * Disable break condition
+	 */
+	ar933x_uart_rmw_clear(up, UARTCS_ADDRESS,
+			      UARTCS_UARTTXBREAK_SET(1));
+
+	if (!is_real_interrupt(up->port.irq) ||
+	    ar933x_ev81847_war())
+		del_timer_sync(&up->timer);
+
+	free_irq(up->port.irq, up);
+}
+
+static const char *ar933x_uart_type(struct uart_port *port)
+{
+	return (port->type == PORT_AR933X) ? "AR933X UART" : NULL;
+}
+
+static void ar933x_uart_release_port(struct uart_port *port)
+{
+	/* Nothing to release ... */
+}
+
+static int ar933x_uart_request_port(struct uart_port *port)
+{
+	/* UARTs always present */
+	return 0;
+}
+
+static void ar933x_uart_config_port(struct uart_port *port, int flags)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+
+	port->type = PORT_AR933X;
+
+	/* Clear mask, so no surprise interrupts. */
+	ar933x_uart_read(up, UARTCS_ADDRESS);
+	/* Clear interrupts status register */
+	ar933x_uart_read(up, UARTINT_ADDRESS);
+}
+
+static int ar933x_uart_verify_port(struct uart_port *port,
+				   struct serial_struct *ser)
+{
+	return -EINVAL;
+}
+
+static struct uart_ops ar933x_uart_ops = {
+	.tx_empty	= ar933x_uart_tx_empty,
+	.set_mctrl	= ar933x_uart_set_mctrl,
+	.get_mctrl	= ar933x_uart_get_mctrl,
+	.stop_tx	= ar933x_uart_stop_tx,
+	.start_tx	= ar933x_uart_start_tx,
+	.stop_rx	= ar933x_uart_stop_rx,
+	.enable_ms	= ar933x_uart_enable_ms,
+	.break_ctl	= ar933x_uart_break_ctl,
+	.startup	= ar933x_uart_startup,
+	.shutdown	= ar933x_uart_shutdown,
+	.set_termios	= ar933x_uart_set_termios,
+	.type		= ar933x_uart_type,
+	.release_port	= ar933x_uart_release_port,
+	.request_port	= ar933x_uart_request_port,
+	.config_port	= ar933x_uart_config_port,
+	.verify_port	= ar933x_uart_verify_port,
+};
+
+#ifdef CONFIG_SERIAL_AR933X_CONSOLE
+
+static struct ar933x_uart_port *ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
+
+static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up)
+{
+	unsigned int status;
+	unsigned int timeout = 60000;
+
+	/* Wait up to 60ms for the character(s) to be sent. */
+	do {
+		status = ar933x_uart_read(up, UARTDATA_ADDRESS);
+		if (--timeout == 0)
+			break;
+		udelay(1);
+	} while (UARTDATA_UARTTXCSR_GET(status) == 0);
+}
+
+static void ar933x_uart_console_putchar(struct uart_port *port, int ch)
+{
+	struct ar933x_uart_port *up = (struct ar933x_uart_port *) port;
+	unsigned int rdata;
+
+	ar933x_uart_wait_xmitr(up);
+
+	rdata = UARTDATA_UARTTXRXDATA_SET(ch) |
+	        UARTDATA_UARTTXCSR_SET(1);
+	ar933x_uart_write(up, UARTDATA_ADDRESS, rdata);
+}
+
+static void ar933x_uart_console_write(struct console *co, const char *s,
+				      unsigned int count)
+{
+	struct ar933x_uart_port *up = ar933x_console_ports[co->index];
+	unsigned long flags;
+	unsigned int ier;
+	int locked = 1;
+
+	local_irq_save(flags);
+
+	if (up->port.sysrq) {
+		locked = 0;
+	} else if (oops_in_progress) {
+		locked = spin_trylock(&up->port.lock);
+	} else
+		spin_lock(&up->port.lock);
+
+	/*
+	 * First save the IER then disable the interrupts
+	 */
+	ier = ar933x_uart_read(up, UARTINTEN_ADDRESS);
+	ar933x_uart_write(up, UARTINTEN_ADDRESS, 0);
+
+	uart_console_write(&up->port, s, count, ar933x_uart_console_putchar);
+
+	/*
+	 * Finally, wait for transmitter to become empty
+	 * and restore the IER
+	 */
+	ar933x_uart_wait_xmitr(up);
+
+	ar933x_uart_write(up, UARTINTEN_ADDRESS, ier);
+	ar933x_uart_write(up, UARTINT_ADDRESS, UARTINT_RSTMASK);
+
+	if (locked)
+		spin_unlock(&up->port.lock);
+
+	local_irq_restore(flags);
+}
+
+static int ar933x_uart_console_setup(struct console *co, char *options)
+{
+	struct ar933x_uart_port *up;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	if (co->index < 0 || co->index >= CONFIG_SERIAL_AR933X_NR_UARTS)
+		return -EINVAL;
+
+	up = ar933x_console_ports[co->index];
+	if (!up)
+		return -ENODEV;
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(&up->port, co, baud, parity, bits, flow);
+}
+
+static struct console ar933x_uart_console = {
+	.name		= "ttyATH",
+	.write		= ar933x_uart_console_write,
+	.device		= uart_console_device,
+	.setup		= ar933x_uart_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+	.data		= &ar933x_uart_driver,
+};
+
+static int __init ar933x_uart_console_init(void)
+{
+	register_console(&ar933x_uart_console);
+	return 0;
+}
+console_initcall(ar933x_uart_console_init);
+
+static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
+{
+	ar933x_console_ports[up->port.line] = up;
+}
+
+#define AR933X_SERIAL_CONSOLE	&ar933x_uart_console
+
+#else
+
+static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {}
+
+#define AR933X_SERIAL_CONSOLE	NULL
+
+#endif /* CONFIG_SERIAL_AR933X_CONSOLE */
+
+static struct uart_driver ar933x_uart_driver = {
+	.owner		= THIS_MODULE,
+	.driver_name	= DRIVER_NAME,
+	.dev_name	= "ttyATH",
+	.nr		= CONFIG_SERIAL_AR933X_NR_UARTS,
+	.cons		= AR933X_SERIAL_CONSOLE,
+};
+
+static int __devinit ar933x_uart_probe(struct platform_device *pdev)
+{
+	struct ar933x_uart_platform_data *pdata;
+	struct ar933x_uart_port *up;
+	struct uart_port *port;
+	struct resource *mem_res;
+	struct resource *irq_res;
+	int id;
+	int ret;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata)
+		return -EINVAL;
+
+	id = pdev->id;
+	if (id == -1)
+		id = 0;
+
+	if (id > CONFIG_SERIAL_AR933X_NR_UARTS)
+		return -EINVAL;
+
+	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem_res) {
+		dev_err(&pdev->dev, "no MEM resource\n");
+		return -EINVAL;
+	}
+
+	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!irq_res) {
+		dev_err(&pdev->dev, "no IRQ resource\n");
+		return -EINVAL;
+	}
+
+	up = kzalloc(sizeof(struct ar933x_uart_port), GFP_KERNEL);
+	if (!up)
+		return -ENOMEM;
+
+	port = &up->port;
+	port->mapbase = mem_res->start;
+
+	port->membase = ioremap(mem_res->start, AR933X_UART_REGS_SIZE);
+	if (!port->membase) {
+		ret = -ENOMEM;
+		goto err_free_up;
+	}
+
+	port->line = id;
+	port->irq = irq_res->start;
+	port->dev = &pdev->dev;
+	port->type = PORT_AR933X;
+	port->iotype = UPIO_MEM32;
+	port->uartclk = pdata->uartclk;
+
+	port->regshift = 2;
+	port->fifosize = AR933X_UART_FIFO_SIZE;
+	port->ops = &ar933x_uart_ops;
+
+	ar933x_uart_add_console_port(up);
+
+	ret = uart_add_one_port(&ar933x_uart_driver, &up->port);
+	if (ret)
+		goto err_unmap;
+
+	platform_set_drvdata(pdev, up);
+	return 0;
+
+err_unmap:
+	iounmap(up->port.membase);
+err_free_up:
+	kfree(up);
+	return ret;
+}
+
+static int __devexit ar933x_uart_remove(struct platform_device *pdev)
+{
+	struct ar933x_uart_port *up;
+
+	up = platform_get_drvdata(pdev);
+	platform_set_drvdata(pdev, NULL);
+
+	if (up) {
+		uart_remove_one_port(&ar933x_uart_driver, &up->port);
+		iounmap(up->port.membase);
+		kfree(up);
+	}
+
+	return 0;
+}
+
+static struct platform_driver ar933x_uart_platform_driver = {
+	.probe		= ar933x_uart_probe,
+	.remove		= __devexit_p(ar933x_uart_remove),
+	.driver		= {
+		.name		= DRIVER_NAME,
+		.owner		= THIS_MODULE,
+	},
+};
+
+static int __init ar933x_uart_init(void)
+{
+	int ret;
+
+	ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS;
+	ret = uart_register_driver(&ar933x_uart_driver);
+	if (ret)
+		goto err_out;
+
+	ret = platform_driver_register(&ar933x_uart_platform_driver);
+	if (ret)
+		goto err_unregister_uart_driver;
+
+	return 0;
+
+err_unregister_uart_driver:
+	uart_unregister_driver(&ar933x_uart_driver);
+err_out:
+	return ret;
+}
+
+static void __exit ar933x_uart_exit(void)
+{
+	platform_driver_unregister(&ar933x_uart_platform_driver);
+	uart_unregister_driver(&ar933x_uart_driver);
+}
+
+module_init(ar933x_uart_init);
+module_exit(ar933x_uart_exit);
+
+MODULE_DESCRIPTION("Atheros AR933X UART driver");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);