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| author | Rob Herring <robh@kernel.org> | 2014-04-18 17:19:55 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-24 16:32:27 -0700 |
| commit | 9aac5887595b765b6f64b2af08b785e82e095b57 (patch) | |
| tree | 9c3cfe69823dbd0d79f8cf9f757e4fe4589c8711 /include/linux/serial_core.h | |
| parent | d20642f0a32575605f152a1cb7753bdfca5fc94b (diff) | |
| download | lwn-9aac5887595b765b6f64b2af08b785e82e095b57.tar.gz lwn-9aac5887595b765b6f64b2af08b785e82e095b57.zip | |
tty/serial: add generic serial earlycon
This introduces generic earlycon infrastructure for serial devices
based on the 8250 earlycon. This allows for supporting earlycon option
with other serial devices. The earlycon output is enabled at the time
early_params are processed.
Only architectures that have fixmap support or have functional ioremap
when early_params are processed are supported. This is the same
restriction that the 8250 driver had.
Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/serial_core.h')
| -rw-r--r-- | include/linux/serial_core.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index f729be981da0..7a15b5b24c0b 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -285,6 +285,22 @@ static inline int uart_poll_timeout(struct uart_port *port) /* * Console helpers. */ +struct earlycon_device { + struct console *con; + struct uart_port port; + char options[16]; /* e.g., 115200n8 */ + unsigned int baud; +}; +int setup_earlycon(char *buf, const char *match, + int (*setup)(struct earlycon_device *, const char *)); + +#define EARLYCON_DECLARE(name, func) \ +static int __init name ## _setup_earlycon(char *buf) \ +{ \ + return setup_earlycon(buf, __stringify(name), func); \ +} \ +early_param("earlycon", name ## _setup_earlycon); + struct uart_port *uart_get_console(struct uart_port *ports, int nr, struct console *c); void uart_parse_options(char *options, int *baud, int *parity, int *bits, |