diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 6 | ||||
| -rw-r--r-- | drivers/tty/serial/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/tty/serial/xilinx_uartps.c | 19 |
3 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 10d51c2f10d..adc1cd7c3bc 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -921,6 +921,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. earlycon= [KNL] Output early console device and options. + cdns,<addr> + Start an early, polled-mode console on a cadence serial + port at the specified address. The cadence serial port + must already be setup and configured. Options are not + yet supported. + uart[8250],io,<addr>[,options] uart[8250],mmio,<addr>[,options] uart[8250],mmio32,<addr>[,options] diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 81f6ee7d422..02a896f4dbc 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1429,6 +1429,7 @@ config SERIAL_XILINX_PS_UART_CONSOLE bool "Cadence UART console support" depends on SERIAL_XILINX_PS_UART=y select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON help Enable a Cadence UART port to be the system console. diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 7f8027f27ab..200c1af2141 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1051,6 +1051,25 @@ static void cdns_uart_console_putchar(struct uart_port *port, int ch) cdns_uart_writel(ch, CDNS_UART_FIFO_OFFSET); } +static void cdns_early_write(struct console *con, const char *s, unsigned n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, cdns_uart_console_putchar); +} + +static int __init cdns_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = cdns_early_write; + + return 0; +} +EARLYCON_DECLARE(cdns, cdns_early_console_setup); + /** * cdns_uart_console_write - perform write operation * @co: Console handle |