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tty: serial: atmel: add earlycon support

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Add early console support which relies on the bootloader for the
initialization of the UART.
Please note, that the compatibles are taken from at91-usart MFD
driver.

Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20220217094620.1148571-1-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Walle 2022-02-17 10:46:20 +01:00 committed by Greg Kroah-Hartman
parent 802d00bd77
commit aab68e959b
2 changed files with 25 additions and 0 deletions
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1
drivers/tty/serial/Kconfig
View File

@ -139,6 +139,7 @@ config SERIAL_ATMEL_CONSOLE
bool "Support for console on AT91 serial port"
depends on SERIAL_ATMEL=y
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON
help
Say Y here if you wish to use an on-chip UART on a Atmel
AT91 processor as the system console (the system

24
drivers/tty/serial/atmel_serial.c
View File

@ -2673,6 +2673,30 @@ static struct console atmel_console = {
.data = &atmel_uart,
};
static void atmel_serial_early_write(struct console *con, const char *s,
unsigned int n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, atmel_console_putchar);
}
static int __init atmel_early_console_setup(struct earlycon_device *device,
const char *options)
{
if (!device->port.membase)
return -ENODEV;
device->con->write = atmel_serial_early_write;
return 0;
}
OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91rm9200-usart",
atmel_early_console_setup);
OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91sam9260-usart",
atmel_early_console_setup);
#define ATMEL_CONSOLE_DEVICE (&atmel_console)
#else