Add earlycon support for the samsung serial port. This allows enabling
the samsung serial port for console when early_params are parse and processed.
Signed-off-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 6 ++++++
drivers/tty/serial/Kconfig | 1 +
drivers/tty/serial/samsung.c | 17 +++++++++++++++++
3 files changed, 24 insertions(+)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 5ae8608..e01c0e5 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -936,6 +936,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
must already be setup and configured. Options are not
yet supported.
+ samsung,<addr>
+ Start an early, polled-mode console on a samsung serial
+ port at the specified address. The samsung serial port
+ must already be setup and configured. Options are not
+ yet supported.
+
smh Use ARM semihosting calls for early console.
earlyprintk= [X86,SH,BLACKFIN,ARM,M68k]
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 249e340..9d42ac8 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -257,6 +257,7 @@ config SERIAL_SAMSUNG_CONSOLE
bool "Support for console on Samsung SoC serial port"
depends on SERIAL_SAMSUNG=y
select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
help
Allow selection of the S3C24XX on-board serial ports for use as
an virtual console.
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index c78f43a..f32e9c8 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -917,6 +917,7 @@ s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
static struct console s3c24xx_serial_console;
+static void s3c24xx_serial_console_putchar(struct uart_port *port, int ch);
static int __init s3c24xx_serial_console_init(void)
{
@@ -926,6 +927,22 @@ static int __init s3c24xx_serial_console_init(void)
console_initcall(s3c24xx_serial_console_init);
#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
+static void samsung_early_write(struct console *con, const char *s, unsigned n)
+{
+ struct earlycon_device *dev = con->data;
+
+ uart_console_write(&dev->port, s, n, s3c24xx_serial_console_putchar);
+}
+
+static int __init samsung_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ if (!device->port.membase)
+ return -ENODEV;
+ device->con->write = samsung_early_write;
+ return 0;
+}
+EARLYCON_DECLARE(samsung, samsung_early_console_setup);
#else
#define S3C24XX_SERIAL_CONSOLE NULL
#endif
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
