[U-Boot] [RFC] PPC: post_word_{load/store} - eliminate redundant code

[Wolfgang Denk]

Dear Michael Zaidman,

In message <o2o660c0f821004210729u4b63cd94n4cb40c87088f8edb at mail.gmail.com> you wrote:
> >
> > Actually there are two parts to it:
> >
> > bootcount_store() and bootcount_load() are needed for the boot
> > counter, a generic feature; I tend to move these into
> > arch/powerpc/lib/bootcount.c; the code also needs to be rewritten to
> > use I/O accessors.
> >
> > post_word_store() and post_word_load() is architecture specific,
> > common POST code that unfortunately also gets used by the logbuffer
> > code. This should be split. Then we would have
> > arch/powerpc/lib/logbuf.c and post/arch/powerpc/post_io.c or such.

Looking at the code I wonder why we need post_word_store() and
post_word_load() functions at all. All implementations I have found
translate into a single ioread32() resp. iowrite32() call.

> Yes, I have seen them also. I actually thought to clean up them but do
> it in two phases - first make the post_word accessors to be common per
> arch and  define them as weak so it will not break existing code.
> Afterwords - eliminate an existing redundant code.
> 
> Thanks for the tips.  Please let me know how do you want me to proceed
> with the patch?

I think we should perform this cleanup in the following steps:

1) Move bootcount_store() and bootcount_load() to architecture
   specific generic locations; this includes both the PowerPC and ARM
   implementations

2) Move arch/blackfin/lib/post.c to post/

3) Eliminate post_word_store() and post_word_load() and use ioread32()
   resp. iowrite32() (or equivalents) directly.

Best regards,

Wolfgang Denk

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