linux-kernel - [PATCH] Add poll_get_char and poll_put_char uart_ops to atmel

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Message-Id: <1246352745-31323-1-git-send-email-albin.tonnerre@free-electrons.com>
Date:	Tue, 30 Jun 2009 11:05:45 +0200
From:	Albin Tonnerre <albin.tonnerre@...il.com>
To:	hskinnemoen@...el.com
Cc:	linux-kernel@...r.kernel.org,
	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
Subject: [PATCH] Add poll_get_char and poll_put_char uart_ops to atmel_serial.

[Please CC: me on replies, I'm not subscribed]

This patch allows using KGDB over the console with the atmel_serial
driver.

Signed-off-by: Albin Tonnerre <albin.tonnerre@...e-electrons.com>
---
 drivers/serial/atmel_serial.c |   27 +++++++++++++++++++++++++++
 1 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index b3497d7..aaab321 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -1211,6 +1211,29 @@ static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser)
 	return ret;
 }
 
+#ifdef CONFIG_CONSOLE_POLL
+static int atmel_poll_get_char(struct uart_port *port)
+{
+	struct atmel_uart_port *aup = to_atmel_uart_port(port);
+
+	while (!(readb(aup->uart.membase + ATMEL_US_CSR) & ATMEL_US_RXRDY))
+		barrier();
+
+	return readb(aup->uart.membase + ATMEL_US_RHR);
+}
+
+static void atmel_poll_put_char(struct uart_port *port, unsigned char ch)
+{
+	struct atmel_uart_port *aup = to_atmel_uart_port(port);
+	unsigned int status;
+
+	while (!(readb(aup->uart.membase + ATMEL_US_CSR) & ATMEL_US_TXRDY))
+		barrier();
+
+	writeb(ch, aup->uart.membase + ATMEL_US_THR);
+}
+#endif
+
 static struct uart_ops atmel_pops = {
 	.tx_empty	= atmel_tx_empty,
 	.set_mctrl	= atmel_set_mctrl,
@@ -1230,6 +1253,10 @@ static struct uart_ops atmel_pops = {
 	.config_port	= atmel_config_port,
 	.verify_port	= atmel_verify_port,
 	.pm		= atmel_serial_pm,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char	= atmel_poll_get_char,
+	.poll_put_char	= atmel_poll_put_char,
+#endif
 };
 
 /*
-- 
1.6.0.4

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