Support Multiple Address Space(AS). Tegra SMMU can have multiple
ASes. We reserve 2 of them for static assignment, AS[0] for system
default, AS[1] for AHB clusters as protected domain from others, where
there are many traditional pheripheral devices like USB, SD/MMC. They
should be isolated from some smart devices like host1x for system
robustness. Even if smart devices behaves wrongly, the traditional
devices(SD/MMC, USB) wouldn't be affected, and the system could
continue most likely.
Signed-off-by: Hiroshi Doyu <hdoyu@xxxxxxxxxx>
---
drivers/iommu/tegra-smmu.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 66406b7..e703741 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -925,7 +925,18 @@ enum {
static int smmu_iommu_add_device(struct device *dev)
{
int err;
- struct dma_iommu_mapping *map = smmu_handle->map[SYSTEM_DEFAULT];
+ u64 swgroups;
+ struct dma_iommu_mapping *map = NULL;
+
+ swgroups = smmu_of_get_memory_client(dev);
+ switch (swgroups) {
+ case TEGRA_SWGROUP_BIT(PPCS):
+ map = smmu_handle->map[SYSTEM_PROTECTED];
+ break;
+ default:
+ map = smmu_handle->map[SYSTEM_DEFAULT];
+ break;
+ }
if (!map)
goto out;
@@ -935,7 +946,7 @@ static int smmu_iommu_add_device(struct device *dev)
return err;
out:
- dev_dbg(dev, "Attached to map %p\n", map);
+ dev_dbg(dev, "Attached to map %p, swgroup:%08llx\n", map, swgroups);
return 0;
}
--
1.8.1.5
--
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