+/*
+ * 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);
projects / openwrt.git / commitdiff