diff options
| author | Martin Blumenstingl <martin.blumenstingl@googlemail.com> | 2016-12-11 21:42:23 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-12 11:51:24 +0100 |
| commit | ec84aa0a920192df56624961cb146947d7d9e11e (patch) | |
| tree | 1249b3ff2d740f9e444c28b5688e829ec6aa173b /drivers | |
| parent | 2aaa957361f9b84fb72ce0124ebb1e5835235ba8 (diff) | |
tty: serial: lantiq: implement earlycon support
This allows enabling earlycon for devices with a Lantiq serial console
by splitting lqasc_serial_port_write() from lqasc_console_write() and
re-using the new function for earlycon's write callback.
The kernel-parameter name matches the driver name ("lantiq"), similar
to how other drivers implement this.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/tty/serial/lantiq.c | 38 |
2 files changed, 32 insertions, 7 deletions
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index e9cf5b67f1b7..6117ac8da48f 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1161,6 +1161,7 @@ config SERIAL_LANTIQ depends on LANTIQ select SERIAL_CORE select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON help Support for console and UART on Lantiq SoCs. diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c index b88832e8ee82..7c9a3f244935 100644 --- a/drivers/tty/serial/lantiq.c +++ b/drivers/tty/serial/lantiq.c @@ -590,13 +590,20 @@ lqasc_console_putchar(struct uart_port *port, int ch) ltq_w8(ch, port->membase + LTQ_ASC_TBUF); } +static void lqasc_serial_port_write(struct uart_port *port, const char *s, + u_int count) +{ + unsigned long flags; + + spin_lock_irqsave(<q_asc_lock, flags); + uart_console_write(port, s, count, lqasc_console_putchar); + spin_unlock_irqrestore(<q_asc_lock, flags); +} static void lqasc_console_write(struct console *co, const char *s, u_int count) { struct ltq_uart_port *ltq_port; - struct uart_port *port; - unsigned long flags; if (co->index >= MAXPORTS) return; @@ -605,11 +612,7 @@ lqasc_console_write(struct console *co, const char *s, u_int count) if (!ltq_port) return; - port = <q_port->port; - - spin_lock_irqsave(<q_asc_lock, flags); - uart_console_write(port, s, count, lqasc_console_putchar); - spin_unlock_irqrestore(<q_asc_lock, flags); + lqasc_serial_port_write(<q_port->port, s, count); } static int __init @@ -659,6 +662,27 @@ lqasc_console_init(void) } console_initcall(lqasc_console_init); +static void lqasc_serial_early_console_write(struct console *co, + const char *s, + u_int count) +{ + struct earlycon_device *dev = co->data; + + lqasc_serial_port_write(&dev->port, s, count); +} + +static int __init +lqasc_serial_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = lqasc_serial_early_console_write; + return 0; +} +OF_EARLYCON_DECLARE(lantiq, DRVNAME, lqasc_serial_early_console_setup); + static struct uart_driver lqasc_reg = { .owner = THIS_MODULE, .driver_name = DRVNAME, |