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serial/arc: Use generic earlycon infrastructure 

With this change both earlyprintk and earlycon coexist
We switch over to latter in next patch

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vineet Gupta 2014-06-24 13:55:09 +05:30 committed by Greg Kroah-Hartman
parent 5a56d59e85
commit 27cfe4ec17
2 changed files with 31 additions and 0 deletions
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1
drivers/tty/serial/Kconfig
View File

@ -1472,6 +1472,7 @@ config SERIAL_ARC_CONSOLE
bool "Console on ARC UART"
depends on SERIAL_ARC=y
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON
help
Enable system Console on ARC UART

30
drivers/tty/serial/arc_uart.c
View File

@ -638,6 +638,36 @@ static int __init arc_serial_probe_earlyprintk(struct platform_device *pdev)
register_console(&arc_early_serial_console);
return 0;
}
static __init void arc_early_serial_write(struct console *con, const char *s,
unsigned int n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, arc_serial_poll_putchar);
}
static int __init arc_early_console_setup(struct earlycon_device *dev,
const char *opt)
{
struct uart_port *port = &dev->port;
unsigned int l, h, hw_val;
if (!dev->port.membase)
return -ENODEV;
hw_val = port->uartclk / (dev->baud * 4) - 1;
l = hw_val & 0xFF;
h = (hw_val >> 8) & 0xFF;
UART_SET_BAUDL(port, l);
UART_SET_BAUDH(port, h);
dev->con->write = arc_early_serial_write;
return 0;
}
EARLYCON_DECLARE(arc_uart, arc_early_console_setup);
#endif /* CONFIG_SERIAL_ARC_CONSOLE */
static int arc_serial_probe(struct platform_device *pdev)