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Subject[PATCH 4/9] serial/arc: Use generic earlycon infrastructure
Date
With this change both earlyprintk and earlycon coexist
We switch over to latter in next patch

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
drivers/tty/serial/Kconfig | 1 +
drivers/tty/serial/arc_uart.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 31 insertions(+)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index fb57159bad3a..2311443be7dc 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1473,6 +1473,7 @@ config SERIAL_ARC_CONSOLE
bool "Console on ARC UART"
depends on SERIAL_ARC=y
select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
help
Enable system Console on ARC UART

diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index a6da10f84293..0c8ba5bb97c7 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -646,6 +646,36 @@ static int __init arc_serial_probe_earlyprintk(struct platform_device *pdev)
register_console(&arc_early_serial_console);
return 0;
}
+
+static __init void arc_early_serial_write(struct console *con, const char *s,
+ unsigned int n)
+{
+ struct earlycon_device *dev = con->data;
+
+ uart_console_write(&dev->port, s, n, arc_serial_poll_putchar);
+}
+
+static int __init arc_early_console_setup(struct earlycon_device *dev,
+ const char *opt)
+{
+ struct uart_port *port = &dev->port;
+ unsigned int l, h, hw_val;
+
+ if (!dev->port.membase)
+ return -ENODEV;
+
+ hw_val = port->uartclk / (dev->baud * 4) - 1;
+ l = hw_val & 0xFF;
+ h = (hw_val >> 8) & 0xFF;
+
+ UART_SET_BAUDL(port, l);
+ UART_SET_BAUDH(port, h);
+
+ dev->con->write = arc_early_serial_write;
+ return 0;
+}
+EARLYCON_DECLARE(arc_uart, arc_early_console_setup);
+
#endif /* CONFIG_SERIAL_ARC_CONSOLE */

static int arc_serial_probe(struct platform_device *pdev)
--
1.8.3.2


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