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powerpc: allow ioremap within reserved memory regions

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Add a flag to let a platform ioremap memory regions marked as reserved.

This flag will be used later by the Nintendo Wii support code to allow
ioremapping the I/O region sitting between MEM1 and MEM2 and marked
as reserved RAM in the patch "wii: use both mem1 and mem2 as ram".

This will no longer be needed when proper discontig memory support
for 32-bit PowerPC is added to the kernel.

Signed-off-by: Albert Herranz <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
This commit is contained in:
Albert Herranz 2009-12-12 06:31:54 +00:00 • committed by Grant Likely
commit c5df7f7751
5 changed files with 16 additions and 2 deletions
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7
lib/lmb.c
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@ -263,7 +263,7 @@ long __init lmb_reserve(u64 base, u64 size)
return lmb_add_region(_rgn, base, size);
}
long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
long lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
{
unsigned long i;
@ -493,6 +493,11 @@ int __init lmb_is_reserved(u64 addr)
return 0;
}
int lmb_is_region_reserved(u64 base, u64 size)
{
return lmb_overlaps_region(&lmb.reserved, base, size);
}
/*
* Given a <base, len>, find which memory regions belong to this range.
* Adjust the request and return a contiguous chunk.