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| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2018-07-09 05:53:31 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2018-07-20 15:03:56 +0300 |
| commit | 2ae86955703e9e6a119af4bbe27f6b6dd7a43131 (patch) | |
| tree | 7465628332bbc2757b1c7db7d54e12a5074bab32 /drivers/iommu/ipmmu-vmsa.c | |
| parent | bc24f62bf8763660110f915cead86dd13840ed26 (diff) | |
| download | linux-2ae86955703e9e6a119af4bbe27f6b6dd7a43131.tar.xz | |
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.c | 8 |
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); + } } /* |