linux-serial.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Sumit Garg <sumit.garg@linaro.org>
To: kgdb-bugreport@lists.sourceforge.net, linux-serial@vger.kernel.org
Cc: gregkh@linuxfoundation.org, daniel.thompson@linaro.org,
	jason.wessel@windriver.com, dianders@chromium.org,
	jslaby@suse.com, linux@armlinux.org.uk,
	linux-kernel@vger.kernel.org, Sumit Garg <sumit.garg@linaro.org>
Subject: [PATCH 5/7] serial: 8250: Implement poll_get_irq() interface
Date: Mon, 22 Jun 2020 19:56:22 +0530	[thread overview]
Message-ID: <1592835984-28613-6-git-send-email-sumit.garg@linaro.org> (raw)
In-Reply-To: <1592835984-28613-1-git-send-email-sumit.garg@linaro.org>

From: Daniel Thompson <daniel.thompson@linaro.org>

Support kgdb NMI console feature via implementing poll_get_irq()
interface. This will allow usage of RX interrupts to support kgdb entry
while serial device is operating in polling mode.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
---
 drivers/tty/serial/8250/8250_port.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index f77bf82..1473b1a 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2138,6 +2138,21 @@ static void serial8250_put_poll_char(struct uart_port *port,
 	serial8250_rpm_put(up);
 }
 
+static int serial8250_get_poll_irq(struct uart_port *port)
+{
+	unsigned int ier;
+	struct uart_8250_port *up = up_to_u8250p(port);
+
+	serial8250_rpm_get(up);
+
+	ier = serial_port_in(port, UART_IER);
+	ier |= UART_IER_RLSI | UART_IER_RDI;
+	serial_port_out(port, UART_IER, ier);
+
+	serial8250_rpm_put(up);
+	return port->irq;
+}
+
 #endif /* CONFIG_CONSOLE_POLL */
 
 int serial8250_do_startup(struct uart_port *port)
@@ -3141,6 +3156,7 @@ static const struct uart_ops serial8250_pops = {
 #ifdef CONFIG_CONSOLE_POLL
 	.poll_get_char = serial8250_get_poll_char,
 	.poll_put_char = serial8250_put_poll_char,
+	.poll_get_irq  = serial8250_get_poll_irq,
 #endif
 };
 
-- 
2.7.4


  parent reply	other threads:[~2020-06-22 14:27 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-22 14:26 [PATCH 0/7] Enable support for kgdb NMI console feature Sumit Garg
2020-06-22 14:26 ` [PATCH 1/7] serial: kgdb_nmi: Allow NMI console to replace kgdb IO console Sumit Garg
2020-06-22 14:26 ` [PATCH 2/7] tty: serial: Add poll_get_irq() to the polling interface Sumit Garg
2020-06-22 15:56   ` Daniel Thompson
2020-06-23  7:48     ` Sumit Garg
2020-06-23 10:52       ` Daniel Thompson
2020-06-22 14:26 ` [PATCH 3/7] kgdb: Add request_nmi() to the io ops table for kgdboc Sumit Garg
2020-06-22 16:03   ` Daniel Thompson
2020-06-23  8:37     ` Sumit Garg
2020-06-23 10:59       ` Daniel Thompson
2020-06-26 19:44         ` Doug Anderson
2020-06-29 11:45           ` Daniel Thompson
2020-06-30  6:09             ` Sumit Garg
2020-06-22 14:26 ` [PATCH 4/7] serial: kgdb_nmi: Add support for interrupt based fallback Sumit Garg
2020-06-22 16:36   ` Daniel Thompson
2020-06-23  9:59     ` Sumit Garg
2020-06-22 14:26 ` Sumit Garg [this message]
2020-06-22 14:26 ` [PATCH 6/7] serial: amba-pl011: Implement poll_get_irq() interface Sumit Garg
2020-06-22 14:26 ` [PATCH 7/7] serial: kgdb_nmi: Replace hrtimer with irq_work ping Sumit Garg

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=1592835984-28613-6-git-send-email-sumit.garg@linaro.org \
    --to=sumit.garg@linaro.org \
    --cc=daniel.thompson@linaro.org \
    --cc=dianders@chromium.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=jason.wessel@windriver.com \
    --cc=jslaby@suse.com \
    --cc=kgdb-bugreport@lists.sourceforge.net \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-serial@vger.kernel.org \
    --cc=linux@armlinux.org.uk \
    /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;
as well as URLs for NNTP newsgroup(s).