linux-kernel - [PATCH 04/49] serial: Add CONSOLE

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Date:	Fri, 22 Oct 2010 11:20:43 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Michal Simek <monstr@...str.eu>,
	Jason Wessel <jason.wessel@...driver.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 04/49] serial: Add CONSOLE_POLL support for uartlite

From: Michal Simek <monstr@...str.eu>

CONSOLE_POLL support for uartlite enables
KGDB debugging over serial line.

Signed-off-by: Michal Simek <monstr@...str.eu>
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
Acked-by: Peter Korsgaard <jacmet@...site.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/serial/uartlite.c |   26 +++++++++++++++++++++++++-
 1 files changed, 25 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/uartlite.c b/drivers/serial/uartlite.c
index 9b03d7b..c4bf54b 100644
--- a/drivers/serial/uartlite.c
+++ b/drivers/serial/uartlite.c
@@ -322,6 +322,26 @@ static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
 	return -EINVAL;
 }
 
+#ifdef CONFIG_CONSOLE_POLL
+static int ulite_get_poll_char(struct uart_port *port)
+{
+	if (!(ioread32be(port->membase + ULITE_STATUS)
+						& ULITE_STATUS_RXVALID))
+		return NO_POLL_CHAR;
+
+	return ioread32be(port->membase + ULITE_RX);
+}
+
+static void ulite_put_poll_char(struct uart_port *port, unsigned char ch)
+{
+	while (ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_TXFULL)
+		cpu_relax();
+
+	/* write char to device */
+	iowrite32be(ch, port->membase + ULITE_TX);
+}
+#endif
+
 static struct uart_ops ulite_ops = {
 	.tx_empty	= ulite_tx_empty,
 	.set_mctrl	= ulite_set_mctrl,
@@ -338,7 +358,11 @@ static struct uart_ops ulite_ops = {
 	.release_port	= ulite_release_port,
 	.request_port	= ulite_request_port,
 	.config_port	= ulite_config_port,
-	.verify_port	= ulite_verify_port
+	.verify_port	= ulite_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char	= ulite_get_poll_char,
+	.poll_put_char	= ulite_put_poll_char,
+#endif
 };
 
 /* ---------------------------------------------------------------------
-- 
1.7.2

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