Am 06.03.2016 um 12:21 schrieb Andreas Färber:
> Split off the bulk of the existing meson_serial_console_write()
> implementation into meson_serial_port_write() for implementing
> meson_serial_early_console_write().
>
> Use "meson" as the earlycon driver name, courtesy of Nicolas.
>
> Signed-off-by: Nicolas Saenz Julienne <nicolassae...@gmail.com>
> Acked-by: Carlo Caione <ca...@endlessm.com>
> Signed-off-by: Andreas Färber <afaer...@suse.de>
> ---
> v3 -> v4:
> * Select SERIAL_EARLYCON (Arnd)
Ping?
Andreas
>
> v2 -> v3:
> * Rename from "meson_serial" to just "meson" (Nicolas)
>
> v1 -> v2:
> * Implement meson_serial_early_console_write() instead of reusing
> meson_serial_console_write() (Peter)
>
> Documentation/kernel-parameters.txt | 6 ++++++
> drivers/tty/serial/Kconfig | 1 +
> drivers/tty/serial/meson_uart.c | 42
> ++++++++++++++++++++++++++++++-------
> 3 files changed, 42 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt
> b/Documentation/kernel-parameters.txt
> index e0a21e4556a6..a7c1377fd80f 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1039,6 +1039,12 @@ bytes respectively. Such letter suffixes can also be
> entirely omitted.
> the driver will use only 32-bit accessors to read/write
> the device registers.
>
> + meson,<addr>
> + Start an early, polled-mode console on a meson serial
> + port at the specified address. The serial port must
> + already be setup and configured. Options are not yet
> + supported.
> +
> msm_serial,<addr>
> Start an early, polled-mode console on an msm serial
> port at the specified address. The serial port
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index bdbe1c533c6a..ad7538e8a4e8 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -213,6 +213,7 @@ config SERIAL_MESON_CONSOLE
> bool "Support for console on meson"
> depends on SERIAL_MESON=y
> select SERIAL_CORE_CONSOLE
> + select SERIAL_EARLYCON
> help
> Say Y here if you wish to use a Amlogic MesonX UART as the
> system console (the system console is the device which
> diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
> index 024445aa0521..6aea0f4a9165 100644
> --- a/drivers/tty/serial/meson_uart.c
> +++ b/drivers/tty/serial/meson_uart.c
> @@ -481,18 +481,13 @@ static void meson_console_putchar(struct uart_port
> *port, int ch)
> writel(ch, port->membase + AML_UART_WFIFO);
> }
>
> -static void meson_serial_console_write(struct console *co, const char *s,
> - u_int count)
> +static void meson_serial_port_write(struct uart_port *port, const char *s,
> + u_int count)
> {
> - struct uart_port *port;
> unsigned long flags;
> int locked;
> u32 val, tmp;
>
> - port = meson_ports[co->index];
> - if (!port)
> - return;
> -
> local_irq_save(flags);
> if (port->sysrq) {
> locked = 0;
> @@ -516,6 +511,18 @@ static void meson_serial_console_write(struct console
> *co, const char *s,
> local_irq_restore(flags);
> }
>
> +static void meson_serial_console_write(struct console *co, const char *s,
> + u_int count)
> +{
> + struct uart_port *port;
> +
> + port = meson_ports[co->index];
> + if (!port)
> + return;
> +
> + meson_serial_port_write(port, s, count);
> +}
> +
> static int meson_serial_console_setup(struct console *co, char *options)
> {
> struct uart_port *port;
> @@ -554,6 +561,27 @@ static int __init meson_serial_console_init(void)
> }
> console_initcall(meson_serial_console_init);
>
> +static void meson_serial_early_console_write(struct console *co,
> + const char *s,
> + u_int count)
> +{
> + struct earlycon_device *dev = co->data;
> +
> + meson_serial_port_write(&dev->port, s, count);
> +}
> +
> +static int __init
> +meson_serial_early_console_setup(struct earlycon_device *device, const char
> *opt)
> +{
> + if (!device->port.membase)
> + return -ENODEV;
> +
> + device->con->write = meson_serial_early_console_write;
> + return 0;
> +}
> +OF_EARLYCON_DECLARE(meson, "amlogic,meson-uart",
> + meson_serial_early_console_setup);
> +
> #define MESON_SERIAL_CONSOLE (&meson_serial_console)
> #else
> #define MESON_SERIAL_CONSOLE NULL
>
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