mpc52xx_mmap_ctl access

mpc52xx_mmap_ctl access

[Marcelo Dalmas]

Hi all!

I'm updating a device driver from linux 2.6.16 ppc
tree to linux 2.6.24 powerpc in a lite5200 based
board.

I need to access  mpc52xx_mmap_ctl and mpc52xx_cslpc.

In ppc tree I do:

 mmap_ctl =
ioremap(MPC52xx_PA(MPC52xx_MMAP_CTL_OFFSET),
                     MPC52xx_MMAP_CTL_SIZE)

How can I access it in powerpc tree?


Thank you,

Marcelo Dalmas
 



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Re: mpc52xx_mmap_ctl access

[Grant Likely]

On Tue, Apr 1, 2008 at 11:03 AM, Marcelo Dalmas <m_dalmas@yahoo.com.br> wrote:
> Hi all!
>
>  I'm updating a device driver from linux 2.6.16 ppc
>  tree to linux 2.6.24 powerpc in a lite5200 based
>  board.
>
>  I need to access  mpc52xx_mmap_ctl and mpc52xx_cslpc.
>
>  In ppc tree I do:
>
>   mmap_ctl =
>  ioremap(MPC52xx_PA(MPC52xx_MMAP_CTL_OFFSET),
>                      MPC52xx_MMAP_CTL_SIZE)
>
>  How can I access it in powerpc tree?

1) In your device tree, add a new node for the local plus bus control
registers with the correct base address.
2) Use of_find_compatible_node() to get a pointer to the node in your
platform init code.
3) Use of_iomap() to map the registers into the kernel address space.

Cheers,
g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.