diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2008-02-08 16:37:03 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-02-08 19:52:40 +1100 |
| commit | 0e0b47abb71a2c4aed5895c01f41827dbd8a981c (patch) | |
| tree | 03b8d844cab362388ecaf28431dac83dc350d6fa /arch/powerpc | |
| parent | ccd05d086f82dba2ab117dcaf4a38cbb2863a439 (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')
| -rw-r--r-- | arch/powerpc/platforms/cell/iommu.c | 12 |
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. |