mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Subject: [RFC] ns16550: support for UART with broken FIFO
Date: Tue, 17 Jan 2012 14:39:06 +0400	[thread overview]
Message-ID: <1326796746-8652-1-git-send-email-antonynpavlov@gmail.com> (raw)

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 drivers/serial/serial_ns16550.c |   19 +++++++++++++++++--
 include/ns16550.h               |    2 ++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index 1217a5f..01de964 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -139,6 +139,8 @@ static unsigned int ns16550_calc_divisor(struct console_device *cdev,
 static void ns16550_serial_init_port(struct console_device *cdev)
 {
 	unsigned int baud_divisor;
+	struct NS16550_plat *plat = (struct NS16550_plat *)
+	    cdev->dev->platform_data;
 
 	/* Setup the serial port with the defaults first */
 	baud_divisor = ns16550_calc_divisor(cdev, CONFIG_BAUDRATE);
@@ -153,7 +155,13 @@ static void ns16550_serial_init_port(struct console_device *cdev)
 	ns16550_write(cdev, (baud_divisor >> 8) & 0xff, dlm);
 	ns16550_write(cdev, LCRVAL, lcr);
 	ns16550_write(cdev, MCRVAL, mcr);
-	ns16550_write(cdev, FCRVAL, fcr);
+
+	if (plat->flags & NS16650_FLAG_DISABLE_FIFO) {
+		ns16550_write(cdev, FCRVAL & ~FCR_FIFO_EN, fcr);
+	} else {
+		ns16550_write(cdev, FCRVAL, fcr);
+	}
+
 #ifdef CONFIG_DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS
 	ns16550_write(cdev, 0x00,  mdr1);
 #endif
@@ -211,6 +219,8 @@ static int ns16550_tstc(struct console_device *cdev)
 static int ns16550_setbaudrate(struct console_device *cdev, int baud_rate)
 {
 	unsigned int baud_divisor = ns16550_calc_divisor(cdev, baud_rate);
+	struct NS16550_plat *plat = (struct NS16550_plat *)
+	    cdev->dev->platform_data;
 
 	ns16550_write(cdev, 0x00, ier);
 	ns16550_write(cdev, LCR_BKSE, lcr);
@@ -218,7 +228,12 @@ static int ns16550_setbaudrate(struct console_device *cdev, int baud_rate)
 	ns16550_write(cdev, (baud_divisor >> 8) & 0xff, dlm);
 	ns16550_write(cdev, LCRVAL, lcr);
 	ns16550_write(cdev, MCRVAL, mcr);
-	ns16550_write(cdev, FCRVAL, fcr);
+	if (plat->flags & NS16650_FLAG_DISABLE_FIFO) {
+		ns16550_write(cdev, FCRVAL & ~FCR_FIFO_EN, fcr);
+	} else {
+		ns16550_write(cdev, FCRVAL, fcr);
+	}
+
 	return 0;
 }
 
diff --git a/include/ns16550.h b/include/ns16550.h
index 5fd52fa..4a41b93 100644
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -52,6 +52,8 @@ struct NS16550_plat {
 				    unsigned char reg_offset);
 
 	int shift;
+	unsigned int flags;
+#define NS16650_FLAG_DISABLE_FIFO	1
 };
 
 #endif				/* __NS16650_PLATFORM_H_ */
-- 
1.7.8.3


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

             reply	other threads:[~2012-01-17 10:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-17 10:39 Antony Pavlov [this message]
2012-01-17 13:09 ` Sascha Hauer
2012-01-17 13:27   ` Antony Pavlov
2012-01-17 14:53     ` Jean-Christophe PLAGNIOL-VILLARD
2012-01-17 19:40       ` Antony Pavlov
2012-01-17 23:58         ` Jean-Christophe PLAGNIOL-VILLARD

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1326796746-8652-1-git-send-email-antonynpavlov@gmail.com \
    --to=antonynpavlov@gmail.com \
    --cc=barebox@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox