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| author |   Andreas Färber <afaerber@suse.de> | 2016-03-06 12:21:24 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-30 09:26:55 -0700 |
| commit | 736d553886a72274e58ff8a0e8a2899978042b8f (patch) | |
| tree | 6f035ed2b8a470ef1a60ddb6f563afcb9ca7e3da /drivers/tty/serial/meson_uart.c | |
| parent | tty: msm_serial: remove static clk rate setting in probe (diff) | |
| download | linux-dev-736d553886a72274e58ff8a0e8a2899978042b8f.tar.xz linux-dev-736d553886a72274e58ff8a0e8a2899978042b8f.zip | |
tty: serial: meson: Implement earlycon support
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 <nicolassaenzj@gmail.com>
Acked-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/meson_uart.c')
| -rw-r--r-- | drivers/tty/serial/meson_uart.c | 42 |
1 files changed, 35 insertions, 7 deletions
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 |