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[POWERPC] Don't enable cell IOMMU fixed mapping if there are no dma-ranges

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In order for the cell IOMMU fixed mapping to work we need "dma-ranges"
properties in the device tree. If there are none then there's no point
enabling the fixed mapping support.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2008-02-08 16:37:03 +11:00 committed by Paul Mackerras
parent ccd05d086f
commit 0e0b47abb7
1 changed files with 12 additions and 0 deletions
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12
arch/powerpc/platforms/cell/iommu.c
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@ -917,6 +917,18 @@ static int __init cell_iommu_fixed_mapping_init(void)
return -1;
}
/* We must have dma-ranges properties for fixed mapping to work */
for (np = NULL; (np = of_find_all_nodes(np));) {
if (of_find_property(np, "dma-ranges", NULL))
break;
}
of_node_put(np);
if (!np) {
pr_debug("iommu: no dma-ranges found, no fixed mapping\n");
return -1;
}
/* The default setup is to have the fixed mapping sit after the
* dynamic region, so find the top of the largest IOMMU window
* on any axon, then add the size of RAM and that's our max value.