Accessing I2C from User Space

Accessing I2C from User Space

[Aman]

Hi,

Iam working on IBM 440gp. I need to access the IIC registers from the
user space. So I wrote a driver mmap entry point. But I noticed that the
function remap_page_range () takes physical address as unsigned long which
is 32 bits. How do I remap the IIC registers which lie in the 36 bit
physical address space?

Regards,
Aman.


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Re: Accessing I2C from User Space

[Matt Porter]

On Fri, Dec 27, 2002 at 12:59:49PM +0530, Aman wrote:
>
> Hi,
>
> Iam working on IBM 440gp. I need to access the IIC registers from the
> user space. So I wrote a driver mmap entry point. But I noticed that the
> function remap_page_range () takes physical address as unsigned long which
> is 32 bits. How do I remap the IIC registers which lie in the 36 bit
> physical address space?

There's a reference to a patch in one of my changeset entries.  It pays
to keep current with the development trees.  See the changesets in your
local BK tree or browse the linuxppc-commit archives.

BTW, why the need to manipulate the registers directly?

Regards,
--
Matt Porter
porter@cox.net
This is Linux Country. On a quiet night, you can hear Windows reboot.

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