diff options
| author | Hiroshi Doyu <hdoyu@nvidia.com> | 2014-05-30 14:20:26 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2014-06-03 17:19:55 +0200 |
| commit | bccef9e5aabf6b721bf76a05b921936cf6010c08 (patch) | |
| tree | e5a82108288eac4f378a59dcab85d8974d97a367 /drivers | |
| parent | 174e7d051e880619e0666b5a637af48d15759c60 (diff) | |
iommu/tegra124: smmu: optionaly AHB enables SMMU
SMMU used to depend on AHB bus. AHB driver needs to be populated and
AHB_XBAR_CTRL_SMMU_INIT_DONE bit needs to be set earliear than SMMU
being populated. Later Tegra SoC (>= T124) doesn't need AHB to enable
SMMU on AHB_XBAR_CTRL for AHB_XBAR_CTRL_SMMU_INIT_DONE any more. This
setting bit is now optional, depending on DT passing ahb phandle or
not.
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/tegra-smmu.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 4a326476c36..20dddc305fb 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -499,7 +499,10 @@ static int smmu_setup_regs(struct smmu_device *smmu) smmu_flush_regs(smmu, 1); - return tegra_ahb_enable_smmu(smmu->ahb); + if (smmu->ahb) + return tegra_ahb_enable_smmu(smmu->ahb); + + return 0; } static void flush_ptc_and_tlb(struct smmu_device *smmu, @@ -1283,9 +1286,6 @@ static int tegra_smmu_probe(struct platform_device *pdev) return -EINVAL; smmu->ahb = of_parse_phandle(dev->of_node, "nvidia,ahb", 0); - if (!smmu->ahb) - return -ENODEV; - smmu->iommu.dev = dev; smmu->num_as = asids; smmu->iovmm_base = base; |