tree 11787b0cc75354af5fe44187cb36840f8dfac18c
parent f9660e8a6c16e17935777cdee5194842904c2d72
author Michael Ellerman <michael@ellerman.id.au> 1204270403 +1100
committer Arnd Bergmann <arnd@arndb.de> 1204527795 +0100

[POWERPC] Use it_offset not pte_offset in cell IOMMU code

The cell IOMMU tce build and free routines use pte_offset to convert
the index passed from the generic IOMMU code into a page table offset.

This takes into account the SPIDER_DMA_OFFSET which sets the top bit
of every DMA address.

However it doesn't cater for the IOMMU window starting at a non-zero
address, as the base of the window is not incorporated into pte_offset
at all.

As it turns out tbl->it_offset already contains the value we need, it
takes into account the base of the window and also pte_offset. So use
it instead!

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>