Re: SPI Driver for 8xx

Re: SPI Driver for 8xx

[Wolfgang Denk]

Dear Michael,

in message <058a01c2596d$171cb5a0$450fa8c0@amitesting> you wrote:
>
> I am looking for SPI driver for 8xx custom board.
> Does anybody have such driver? If yes, how can I pick it up?

We have two versions of SPI drivers for the 8xx in our kernel source:

arch/ppc/8xx_io/cpm_spi.*	is a plain simple SPI driver for the
                                MPC8xx

arch/ppc/8xx_io/lwmon_spi.c     contains a more complicated, but very
                                specialized SPI driver, which might
				give you some ideas if you want to do
				tricky things

See http://www.denx.de/re/linux.html for instructions how to get  the
kernel source from our CVS server.

Hope this helps,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
You Earth people glorified organized violence  for  forty  centuries.
But you imprison those who employ it privately.
	-- Spock, "Dagger of the Mind", stardate 2715.1

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SPI Driver for 8xx

[Michael Meriin]

Hello List,

I am looking for SPI driver for 8xx custom board.
Does anybody have such driver? If yes, how can I pick it up?

Best Regards,
                     Michael Meriin


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Re: SPI Driver for 8xx

[Wolfgang Denk]

Dear Michael,

in message <059501c25971$606eb600$450fa8c0@amitesting> you wrote:
>
> Thank you very much for your quick response.
> But I failed to get to : http://www.denx.de/re/linux.html :((

Which sort of error message do you get?

Alternate way: go to http://www.denx.de , and click on "Software"

> I will be happy to get both drivers, because I have to control several SPI
> devices
> and therefore the driver must be complicated ;))

No, the driver stays as simple as is. You just have to add  separated
devices  based  on  how  your  hardware  implements the device select
function.

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"The two most common things in the universe are hydrogen  and  stupi-
dity."

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Re: SPI Driver for 8xx

[Michael Meriin]

Dear Wolfgang,

Thank you very much for your quick response.
But I failed to get to : http://www.denx.de/re/linux.html :((
I will be happy to get both drivers, because I have to control several SPI
devices
and therefore the driver must be complicated ;))

Best Regards,
                     Michael Meriin



----- Original Message -----
From: "Wolfgang Denk" <wd@denx.de>
To: "Michael Meriin" <Michael@KSWaves.com>
Cc: "linuxppc-embedded" <linuxppc-embedded@lists.linuxppc.org>
Sent: Wednesday, September 11, 2002 09:48
Subject: Re: SPI Driver for 8xx


> Dear Michael,
>
> in message <058a01c2596d$171cb5a0$450fa8c0@amitesting> you wrote:
> >
> > I am looking for SPI driver for 8xx custom board.
> > Does anybody have such driver? If yes, how can I pick it up?
>
> We have two versions of SPI drivers for the 8xx in our kernel source:
>
> arch/ppc/8xx_io/cpm_spi.* is a plain simple SPI driver for the
>                                 MPC8xx
>
> arch/ppc/8xx_io/lwmon_spi.c     contains a more complicated, but very
>                                 specialized SPI driver, which might
> give you some ideas if you want to do
> tricky things
>
> See http://www.denx.de/re/linux.html for instructions how to get  the
> kernel source from our CVS server.
>
> Hope this helps,
>
> Wolfgang Denk
>
> --
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
> You Earth people glorified organized violence  for  forty  centuries.
> But you imprison those who employ it privately.
> -- Spock, "Dagger of the Mind", stardate 2715.1


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: SPI Driver for 8xx

[Michael Meriin]

Dear Wolfgang,

> > But I failed to get to : http://www.denx.de/re/linux.html :((
>
> Which sort of error message do you get?

Netscape is unable to locate the server www.denx.de
>
> Alternate way: go to http://www.denx.de , and click on "Software"
>
> > I will be happy to get both drivers, because I have to control several
SPI
> > devices
> > and therefore the driver must be complicated ;))
>
> No, the driver stays as simple as is. You just have to add  separated
> devices  based  on  how  your  hardware  implements the device select
> function.
>
> Wolfgang Denk

Regards,
    Michael Meriin


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Re: SPI Driver for 8xx

[Wolfgang Denk]

Dear Jocke,

in message <IGEFJKJNHJDCBKALBJLLAEFNFGAA.joakim.tjernlund@lumentis.se> you wrote:
> Great, I too need a SPI driver for mpc8xx.

:-)

> I took a quick look at the cpm_spi.* driver and looks fine to me, but I have a question:
> The driver turns off interrupts during transmission. The comment in the file
> says: ... we may need to call it from interrupt handlers.
>
> I can not see any call from a interrupt handler in this code. Where is the call(s) from/to
> interrupt handlers? Or is this just a future extension?

We use the SPI communication inside another device  driver  (for  CAN
bus).  It is this other driver that will call the SPI I/O function in
it's interrupt handler.

> I would like to keep the interrupts on, if possible.

Feel free to modify the driver according to your needs. It should not
be a problem except for special cases like ours.

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"If the code and  the  comments  disagree,  then  both  are  probably
wrong."                                                - Norm Schryer

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