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tty: serial: bcm63xx: Enable DT earlycon support

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This enables early console output if there is a chosen/stdout-path
property referencing a UART node with the "brcm,bcm6345-uart" compatible
string.  The bootloader sets up the pinmux and baud/parity/etc.
Tested on bcm3384 (MIPS, DT).

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kevin Cernekee 2014-10-21 15:23:02 -07:00 committed by Greg Kroah-Hartman
parent e1a184eea9
commit 1ab8e4b1ac
2 changed files with 21 additions and 0 deletions
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1
drivers/tty/serial/Kconfig
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@ -1297,6 +1297,7 @@ config SERIAL_BCM63XX_CONSOLE
bool "Console on BCM63xx serial port"
depends on SERIAL_BCM63XX=y
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON
help
If you have enabled the serial port on the BCM63xx CPU
you can make it the console by answering Y to this option.

20
drivers/tty/serial/bcm63xx_uart.c
View File

@ -782,6 +782,26 @@ static int __init bcm63xx_console_init(void)
console_initcall(bcm63xx_console_init);
static void bcm_early_write(struct console *con, const char *s, unsigned n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, bcm_console_putchar);
wait_for_xmitr(&dev->port);
}
static int __init bcm_early_console_setup(struct earlycon_device *device,
const char *opt)
{
if (!device->port.membase)
return -ENODEV;
device->con->write = bcm_early_write;
return 0;
}
OF_EARLYCON_DECLARE(bcm63xx_uart, "brcm,bcm6345-uart", bcm_early_console_setup);
#define BCM63XX_CONSOLE (&bcm63xx_console)
#else
#define BCM63XX_CONSOLE NULL