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authorMichael Ellerman <michael@ellerman.id.au>2008-02-08 16:37:03 +1100
committerPaul Mackerras <paulus@samba.org>2008-02-08 19:52:40 +1100
commit0e0b47abb71a2c4aed5895c01f41827dbd8a981c (patch)
tree03b8d844cab362388ecaf28431dac83dc350d6fa /arch/powerpc/platforms
parentccd05d086f82dba2ab117dcaf4a38cbb2863a439 (diff)
[POWERPC] Don't enable cell IOMMU fixed mapping if there are no dma-ranges
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>
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r--arch/powerpc/platforms/cell/iommu.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index a276064471b..1f7b2547408 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -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.