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Commit 1d59b382 authored by Stefan Agner's avatar Stefan Agner Committed by Greg Kroah-Hartman
Browse files

serial: fsl_lpuart: add earlycon support 



Add support for DT and command line based earlycon support for
lpuart and lpuart32 used on Freescale Vybrid and and QorIQ LS1021A
processors.

Signed-off-by: default avatarStefan Agner <stefan@agner.ch>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6200cbaf

Documentation/kernel-parameters.txt

+7 −0
Original line number Diff line number Diff line
@@ -1023,6 +1023,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
			serial port must already be setup and configured.

			Options are not yet supported.



		lpuart,<addr>

		lpuart32,<addr>

			Use early console provided by Freescale LP UART driver

			found on Freescale Vybrid and QorIQ LS1021A processors.

			A valid base address must be provided, and the serial

			port must already be setup and configured.



	earlyprintk=	[X86,SH,BLACKFIN,ARM,M68k]

			earlyprintk=vga

			earlyprintk=efi

drivers/tty/serial/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -1539,6 +1539,7 @@ config SERIAL_FSL_LPUART 
	tristate "Freescale lpuart serial port support"

	depends on HAS_DMA

	select SERIAL_CORE

	select SERIAL_EARLYCON

	help

	  Support for the on-chip lpuart on some Freescale SOCs.

drivers/tty/serial/fsl_lpuart.c

+39 −0
Original line number Diff line number Diff line
@@ -1746,6 +1746,45 @@ static struct console lpuart32_console = { 
	.data		= &lpuart_reg,

};



static void lpuart_early_write(struct console *con, const char *s, unsigned n)

{

	struct earlycon_device *dev = con->data;



	uart_console_write(&dev->port, s, n, lpuart_console_putchar);

}



static void lpuart32_early_write(struct console *con, const char *s, unsigned n)

{

	struct earlycon_device *dev = con->data;



	uart_console_write(&dev->port, s, n, lpuart32_console_putchar);

}



static int __init lpuart_early_console_setup(struct earlycon_device *device,

					  const char *opt)

{

	if (!device->port.membase)

		return -ENODEV;



	device->con->write = lpuart_early_write;

	return 0;

}



static int __init lpuart32_early_console_setup(struct earlycon_device *device,

					  const char *opt)

{

	if (!device->port.membase)

		return -ENODEV;



	device->con->write = lpuart32_early_write;

	return 0;

}



OF_EARLYCON_DECLARE(lpuart, "fsl,vf610-lpuart", lpuart_early_console_setup);

OF_EARLYCON_DECLARE(lpuart32, "fsl,ls1021a-lpuart", lpuart32_early_console_setup);

EARLYCON_DECLARE(lpuart, lpuart_early_console_setup);

EARLYCON_DECLARE(lpuart32, lpuart32_early_console_setup);



#define LPUART_CONSOLE	(&lpuart_console)

#define LPUART32_CONSOLE	(&lpuart32_console)

#else