linux-kernel - [PATCH v3 05/10] serial: mps2-uart: add support for early console

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Date:	Tue, 16 Feb 2016 10:08:10 +0000
From:	Vladimir Murzin <vladimir.murzin@....com>
To:	arnd@...db.de, linux@....linux.org.uk, gregkh@...uxfoundation.org,
	daniel.lezcano@...aro.org, tglx@...utronix.de,
	u.kleine-koenig@...gutronix.de
Cc:	mark.rutland@....com, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	jslaby@...e.cz, robh+dt@...nel.org, andy.shevchenko@...il.com,
	devicetree@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-api@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 05/10] serial: mps2-uart: add support for early console

This adds support early console for MPS2 UART which can be enabled via
earlycon=mps2,0x40004000

Signed-off-by: Vladimir Murzin <vladimir.murzin@....com>
---
 drivers/tty/serial/Kconfig     |    1 +
 drivers/tty/serial/mps2-uart.c |   30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 3a248be..4ed6e51 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1454,6 +1454,7 @@ config SERIAL_MPS2_UART_CONSOLE
 	bool "MPS2 UART console support"
 	depends on SERIAL_MPS2_UART
 	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
 
 config SERIAL_MPS2_UART
 	bool "MPS2 UART port"
diff --git a/drivers/tty/serial/mps2-uart.c b/drivers/tty/serial/mps2-uart.c
index d97f3a9..f3a3bd1 100644
--- a/drivers/tty/serial/mps2-uart.c
+++ b/drivers/tty/serial/mps2-uart.c
@@ -435,6 +435,36 @@ static struct console mps2_uart_console = {
 
 #define MPS2_SERIAL_CONSOLE (&mps2_uart_console)
 
+static void mps2_early_putchar(struct uart_port *port, int ch)
+{
+
+	while (readb(port->membase + UARTn_STATE) & UARTn_STATE_TX_FULL)
+		cpu_relax();
+
+	writeb((unsigned char)ch, port->membase + UARTn_DATA);
+}
+
+
+static void mps2_early_write(struct console *con, const char *s, unsigned n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, mps2_early_putchar);
+}
+
+static int __init mps2_early_console_setup(struct earlycon_device *device,
+					   const char *opt)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	device->con->write = mps2_early_write;
+
+	return 0;
+}
+EARLYCON_DECLARE(mps2, mps2_early_console_setup);
+OF_EARLYCON_DECLARE(mps2, "arm,mps2-uart", mps2_early_console_setup);
+
 #else
 #define MPS2_SERIAL_CONSOLE NULL
 #endif
-- 
1.7.9.5