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Commit 0dcc0542 authored by Tobias Klauser's avatar Tobias Klauser Committed by Greg Kroah-Hartman
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serial: altera_jtaguart: add earlycon support 



Nios2 currently uses its own early printk implementation, rather than
using unified earlycon support to show boot messages on altera_jtaguart
(and altera_uart for that matter).

Add earlycon support to altera_jtaguart so that other archs may use it. Also,
this will allow the early printk implementation in arch/nios2 to eventually be
removed in a future patch.

Cc: Ley Foon Tan <lftan@altera.com>
Signed-off-by: default avatarTobias Klauser <tklauser@distanz.ch>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 47baf1ad

drivers/tty/serial/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -1343,6 +1343,7 @@ config SERIAL_ALTERA_JTAGUART_CONSOLE 
	bool "Altera JTAG UART console support"

	depends on SERIAL_ALTERA_JTAGUART=y

	select SERIAL_CORE_CONSOLE

	select SERIAL_EARLYCON

	help

	  Enable a Altera JTAG UART port to be the system console.

drivers/tty/serial/altera_jtaguart.c

+20 −0
Original line number Diff line number Diff line
@@ -383,6 +383,26 @@ console_initcall(altera_jtaguart_console_init); 


#define	ALTERA_JTAGUART_CONSOLE	(&altera_jtaguart_console)



static void altera_jtaguart_earlycon_write(struct console *co, const char *s,

					   unsigned int count)

{

	struct earlycon_device *dev = co->data;



	uart_console_write(&dev->port, s, count, altera_jtaguart_console_putc);

}



static int __init altera_jtaguart_earlycon_setup(struct earlycon_device *dev,

						 const char *options)

{

	if (!dev->port.membase)

		return -ENODEV;



	dev->con->write = altera_jtaguart_earlycon_write;

	return 0;

}



OF_EARLYCON_DECLARE(juart, "altr,juart-1.0", altera_jtaguart_earlycon_setup);



#else



#define	ALTERA_JTAGUART_CONSOLE	NULL