diff options
| author | Michael Walle <michael@walle.cc> | 2022-02-17 10:46:20 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-21 19:47:42 +0100 |
| commit | aab68e959b37eddfe6b1640636457e960f66db2c (patch) | |
| tree | 6632bdbdd619a93f26f92184a3465600ed512d52 /drivers/tty | |
| parent | 802d00bd774b77fe132e9e83462b96fb9919411c (diff) | |
tty: serial: atmel: add earlycon support
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 24 |
2 files changed, 25 insertions, 0 deletions
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 0e5ccb25bdb1..407a98ec0791 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -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 diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 2d09a89974a2..73d43919898d 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -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 |