From: Vitaly Bordug <vitb@kernel.crashing.org>
To: linuxppc-dev@ozlabs.org
Subject: Re: MPC8560 CPM2 SCC(UART) Driver CPM_UART_CONSOLE
Date: Tue, 25 Sep 2007 19:59:59 +0400 [thread overview]
Message-ID: <20070925195959.531b2fe5@kernel.crashing.org> (raw)
In-Reply-To: <20070925104704.M46195@cdotd.ernet.in>
Hello Deepak,
On Tue, 25 Sep 2007 17:33:59 +0630
Deepak Gaur wrote:
> Hi all,
>
> I am writing a kernel module which is required to parse the characters received from a
> device attached to MPC8560 SCC2 (UART slave mode) on serial interface. This SCC is
> required to be configured for single-buffer, character based operation. Moreover on
> another SCC (SCC1 UART master mode) the board debug interface(console) is connected.
>
> While trying to figure out CPM UART device driver interface available in file
> drivers/serial/cpm_uart/cpm_uart_core.c for my kernel module I found that some of the
> functions are available when CPM_UART_CONSOLE is enabled.
>
> My doubt is regarding status of this flag for my hardware setup. Should this flag be
> enabled or not. If it is required to be enabled for supporting SCC1 then how SCC2 will
> be handled?
>
well, console is normally initialized early, before actual uart driver, that's why those bits are hidden
behind CPM_UART_CONSOLE.
I suppose you'll just have to get SCC2 uart to work and use ttyCPM1... or if you application is more specific, write another driver
using cpm_uart_core.c as a reference. But I would not recommend using CPM_UART_CONSOLE stuff - it's pretty restricted and assumes very early triggering, with plenty of stuff not initialized.
> As I am a novice in this area , I shall be grateful if you please guide me in
> understanding this driver code.
>
> with regards,
>
> Deepak Gaur
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
--
Sincerely, Vitaly
prev parent reply other threads:[~2007-09-25 16:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-25 11:03 MPC8560 CPM2 SCC(UART) Driver CPM_UART_CONSOLE Deepak Gaur
2007-09-25 11:14 ` CPM_UART_CONSOLE Deepak Gaur
2007-09-25 15:43 ` MPC8560 CPM2 SCC(UART) Driver CPM_UART_CONSOLE Scott Wood
2007-09-25 15:59 ` Vitaly Bordug [this message]
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=20070925195959.531b2fe5@kernel.crashing.org \
--to=vitb@kernel.crashing.org \
--cc=linuxppc-dev@ozlabs.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.