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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2018-07-09 11:53:31 +0900
committerJoerg Roedel <jroedel@suse.de>2018-07-20 14:03:56 +0200
commit2ae86955703e9e6a119af4bbe27f6b6dd7a43131 (patch)
tree7465628332bbc2757b1c7db7d54e12a5074bab32 /drivers/iommu/ipmmu-vmsa.c
parentbc24f62bf8763660110f915cead86dd13840ed26 (diff)
downloadlinux-2ae86955703e9e6a119af4bbe27f6b6dd7a43131.tar.bz2
iommu/ipmmu-vmsa: IMUCTRn.TTSEL needs a special usage on R-Car Gen3
The TTSEL bit of IMUCTRn register of R-Car Gen3 needs to be set unused MMU context number even if uTLBs are disabled (The MMUEN bit of IMUCTRn register = 0). Since initial values of IMUCTRn.TTSEL on all IPMMU-domains are 0, this patch adds a new feature "reserved_context" to reserve IPMMU context number 0 as the unused MMU context. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/ipmmu-vmsa.c')
-rw-r--r--drivers/iommu/ipmmu-vmsa.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index 6a0e7142f41b..6cbd2bdb92ce 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -47,6 +47,7 @@ struct ipmmu_features {
unsigned int number_of_contexts;
bool setup_imbuscr;
bool twobit_imttbcr_sl0;
+ bool reserved_context;
};
struct ipmmu_vmsa_device {
@@ -925,6 +926,7 @@ static const struct ipmmu_features ipmmu_features_default = {
.number_of_contexts = 1, /* software only tested with one context */
.setup_imbuscr = true,
.twobit_imttbcr_sl0 = false,
+ .reserved_context = false,
};
static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
@@ -933,6 +935,7 @@ static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
.number_of_contexts = 8,
.setup_imbuscr = false,
.twobit_imttbcr_sl0 = true,
+ .reserved_context = true,
};
static const struct of_device_id ipmmu_of_ids[] = {
@@ -1038,6 +1041,11 @@ static int ipmmu_probe(struct platform_device *pdev)
}
ipmmu_device_reset(mmu);
+
+ if (mmu->features->reserved_context) {
+ dev_info(&pdev->dev, "IPMMU context 0 is reserved\n");
+ set_bit(0, mmu->ctx);
+ }
}
/*