All of lore.kernel.org
 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 ` [RFC] ns16550: support for UART with broken FIFO 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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.