diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers')
| -rw-r--r-- | target/linux/ar71xx/files/drivers/serial/ar933x_uart.c | 1282 |
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 0000000..ff0170f --- /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); |