MPC8560 CPM2 SCC(UART) Driver CPM_UART_CONSOLE

MPC8560 CPM2 SCC(UART) Driver CPM_UART_CONSOLE

[Deepak Gaur]

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?

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

CPM_UART_CONSOLE

[Deepak Gaur]

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 (Linux ppc)
./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?

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

Re: MPC8560 CPM2 SCC(UART) Driver CPM_UART_CONSOLE

[Scott Wood]

On Tue, Sep 25, 2007 at 05:33:59PM +0630, Deepak Gaur wrote:
> 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?

That flag should only be set on the actual console.  What is it that you
need to do with the other port that the driver won't currently do?

-Scott

Re: MPC8560 CPM2 SCC(UART) Driver CPM_UART_CONSOLE

[Vitaly Bordug]

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