From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Daniel Walker <dwalker@codeaurora.org>,
Tony Lindgren <tony@atomide.com>,
linux-arm-msm@vger.kernel.org,
"Hyok S. Choi" <hyok.choi@samsung.com>,
Jeff Ohlstein <johlstei@quicinc.com>
Subject: Re: [PATCH] serial: DCC(JTAG) serial and console emulation support
Date: Wed, 13 Oct 2010 19:44:53 +0200 [thread overview]
Message-ID: <201010131944.54135.arnd@arndb.de> (raw)
In-Reply-To: <1286986623.28336.3.camel@c-dwalke-linux.qualcomm.com>
On Wednesday 13 October 2010 18:17:03 Daniel Walker wrote:
> > I think you would be much better off making it a "hvc" driver, where
> > you just need to provide a read character and write character function
> > and an optional interrupt handler but otherwise have the common hvc
> > code take care of polling the hardware and talking to the tty layer.
>
> I don't know what the "hvc" driver is "Hypervisor Virtual Console"
> maybe?
Yes, it originally was used only on hypervisors that had simple
read/write type consoles, but has now turned into a generic facility
that is used by a number of consoles that don't look like classic
serial ports.
> Can you give any sort of example driver which does what you
> suggesting?
Look at drivers/char/hvc_tile.c for the simplest case or
drivers/char/hvc_vio.c for one that uses interrupts.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] serial: DCC(JTAG) serial and console emulation support
Date: Wed, 13 Oct 2010 19:44:53 +0200 [thread overview]
Message-ID: <201010131944.54135.arnd@arndb.de> (raw)
In-Reply-To: <1286986623.28336.3.camel@c-dwalke-linux.qualcomm.com>
On Wednesday 13 October 2010 18:17:03 Daniel Walker wrote:
> > I think you would be much better off making it a "hvc" driver, where
> > you just need to provide a read character and write character function
> > and an optional interrupt handler but otherwise have the common hvc
> > code take care of polling the hardware and talking to the tty layer.
>
> I don't know what the "hvc" driver is "Hypervisor Virtual Console"
> maybe?
Yes, it originally was used only on hypervisors that had simple
read/write type consoles, but has now turned into a generic facility
that is used by a number of consoles that don't look like classic
serial ports.
> Can you give any sort of example driver which does what you
> suggesting?
Look at drivers/char/hvc_tile.c for the simplest case or
drivers/char/hvc_vio.c for one that uses interrupts.
Arnd
next prev parent reply other threads:[~2010-10-13 17:45 UTC|newest]
Thread overview: 140+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-05 19:07 [PATCH] serial: DCC(JTAG) serial and console emulation support Daniel Walker
2010-10-05 19:07 ` Daniel Walker
2010-10-06 2:55 ` Nicolas Pitre
2010-10-06 2:55 ` Nicolas Pitre
2010-10-06 13:48 ` Daniel Walker
2010-10-06 13:48 ` Daniel Walker
2010-10-06 14:22 ` Nicolas Pitre
2010-10-06 14:22 ` Nicolas Pitre
2010-10-06 14:49 ` Daniel Walker
2010-10-06 14:49 ` Daniel Walker
2010-10-06 15:21 ` Nicolas Pitre
2010-10-06 15:21 ` Nicolas Pitre
2010-10-06 15:33 ` Daniel Walker
2010-10-06 15:33 ` Daniel Walker
2010-10-06 15:47 ` Nicolas Pitre
2010-10-06 15:47 ` Nicolas Pitre
2010-10-06 15:54 ` Daniel Walker
2010-10-06 15:54 ` Daniel Walker
2010-10-06 16:22 ` Nicolas Pitre
2010-10-06 16:22 ` Nicolas Pitre
2010-10-06 16:40 ` Daniel Walker
2010-10-06 16:40 ` Daniel Walker
2010-10-06 17:02 ` Nicolas Pitre
2010-10-06 17:02 ` Nicolas Pitre
2010-10-06 17:07 ` Daniel Walker
2010-10-06 17:07 ` Daniel Walker
2010-10-07 21:27 ` Tony Lindgren
2010-10-07 21:27 ` Tony Lindgren
2010-10-07 21:58 ` Daniel Walker
2010-10-07 21:58 ` Daniel Walker
2010-10-08 1:28 ` Nicolas Pitre
2010-10-08 1:28 ` Nicolas Pitre
2010-10-08 20:35 ` Tony Lindgren
2010-10-08 20:35 ` Tony Lindgren
2010-10-08 20:59 ` Tony Lindgren
2010-10-08 20:59 ` Tony Lindgren
2010-10-08 21:27 ` Nicolas Pitre
2010-10-08 21:27 ` Nicolas Pitre
2010-10-08 20:36 ` Tony Lindgren
2010-10-08 20:36 ` Tony Lindgren
2010-10-08 1:25 ` Nicolas Pitre
2010-10-08 1:25 ` Nicolas Pitre
2010-10-08 20:32 ` Tony Lindgren
2010-10-08 20:32 ` Tony Lindgren
2010-10-08 20:58 ` Tony Lindgren
2010-10-08 20:58 ` Tony Lindgren
2010-10-08 21:28 ` Nicolas Pitre
2010-10-08 21:28 ` Nicolas Pitre
2010-10-08 21:25 ` Nicolas Pitre
2010-10-08 21:25 ` Nicolas Pitre
2010-10-08 21:49 ` Tony Lindgren
2010-10-08 21:49 ` Tony Lindgren
2010-10-09 0:57 ` Nicolas Pitre
2010-10-09 0:57 ` Nicolas Pitre
2010-10-13 15:21 ` Arnd Bergmann
2010-10-13 15:21 ` Arnd Bergmann
2010-10-13 16:17 ` Daniel Walker
2010-10-13 16:17 ` Daniel Walker
2010-10-13 17:44 ` Arnd Bergmann [this message]
2010-10-13 17:44 ` Arnd Bergmann
2010-10-13 18:08 ` Daniel Walker
2010-10-13 18:08 ` Daniel Walker
2010-10-13 19:45 ` Arnd Bergmann
2010-10-13 19:45 ` Arnd Bergmann
2010-10-13 19:52 ` Daniel Walker
2010-10-13 19:52 ` Daniel Walker
2010-10-13 20:10 ` Arnd Bergmann
2010-10-13 20:10 ` Arnd Bergmann
2010-10-13 20:24 ` Daniel Walker
2010-10-13 20:24 ` Daniel Walker
2010-10-13 20:44 ` Nicolas Pitre
2010-10-13 20:44 ` Nicolas Pitre
2010-10-13 20:49 ` Daniel Walker
2010-10-13 20:49 ` Daniel Walker
2010-10-13 22:51 ` Nicolas Pitre
2010-10-13 22:51 ` Nicolas Pitre
2010-10-13 23:26 ` Russell King - ARM Linux
2010-10-13 23:26 ` Russell King - ARM Linux
2010-10-13 23:41 ` Nicolas Pitre
2010-10-13 23:41 ` Nicolas Pitre
2010-10-13 19:55 ` Nicolas Pitre
2010-10-13 19:55 ` Nicolas Pitre
2010-10-13 20:00 ` Daniel Walker
2010-10-13 20:00 ` Daniel Walker
2010-10-13 20:27 ` Nicolas Pitre
2010-10-13 20:27 ` Nicolas Pitre
2010-10-13 20:47 ` Daniel Walker
2010-10-13 20:47 ` Daniel Walker
2010-10-13 22:05 ` Daniel Walker
2010-10-13 22:05 ` Daniel Walker
-- strict thread matches above, loose matches on Subject: below --
2010-10-07 18:36 Daniel Walker
2010-10-07 19:25 ` Mike Frysinger
2010-10-07 19:39 ` Daniel Walker
2010-10-07 19:48 ` Mike Frysinger
2010-10-07 19:58 ` Daniel Walker
2010-10-07 20:02 ` Mike Frysinger
2010-10-07 20:06 ` Daniel Walker
2010-10-07 20:47 ` Mike Frysinger
2010-10-07 20:59 ` Daniel Walker
2010-10-07 21:05 ` Mike Frysinger
2010-10-07 21:17 ` Daniel Walker
2010-10-07 21:32 ` Mike Frysinger
2010-10-07 21:50 ` Daniel Walker
2010-10-07 20:52 ` Alan Cox
2010-10-07 20:37 ` Daniel Walker
2010-10-07 21:08 ` Alan Cox
2010-10-07 20:50 ` Alan Cox
2010-10-07 20:36 ` Daniel Walker
2010-10-07 21:05 ` Alan Cox
2010-10-07 20:51 ` Daniel Walker
2010-10-07 21:03 ` Mike Frysinger
2010-10-07 21:14 ` Daniel Walker
2010-10-08 8:13 ` Alan Cox
2010-10-08 15:23 ` Daniel Walker
2010-10-08 15:40 ` Greg KH
2010-10-08 16:11 ` Daniel Walker
2010-10-08 16:56 ` Alan Cox
2010-10-08 16:45 ` Daniel Walker
2010-10-08 18:38 ` Mike Frysinger
2010-10-08 19:01 ` Daniel Walker
2010-10-08 19:20 ` Mike Frysinger
2010-10-08 19:50 ` Daniel Walker
2010-10-08 22:02 ` Mike Frysinger
2010-10-08 22:22 ` Daniel Walker
2010-10-09 5:38 ` Mike Frysinger
2010-10-07 21:15 ` Greg KH
2010-10-07 21:47 ` Daniel Walker
2010-10-07 21:52 ` Greg KH
2010-10-07 22:11 ` Daniel Walker
2010-10-08 2:04 ` Mike Frysinger
2010-10-07 21:38 ` Alan Cox
2010-10-07 21:41 ` Daniel Walker
2010-10-08 8:18 ` Alan Cox
2010-10-08 15:16 ` Daniel Walker
2010-10-08 4:59 Daniel Walker
2010-10-08 6:05 ` Mike Frysinger
2010-10-08 19:34 matthieu castet
2010-10-08 19:52 ` Daniel Walker
2010-10-08 19:55 ` Daniel Walker
2010-10-08 20:40 ` matthieu castet
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