diff options
Diffstat (limited to 'drivers/iommu/exynos-iommu.c')
| -rw-r--r-- | drivers/iommu/exynos-iommu.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index e42a76cc9674..8e289e2a05fb 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -284,6 +284,28 @@ static void __sysmmu_set_ptbase(struct sysmmu_drvdata *data, phys_addr_t pgd) __sysmmu_tlb_invalidate(data); } +static void __sysmmu_get_version(struct sysmmu_drvdata *data) +{ + u32 ver; + + clk_enable(data->clk_master); + clk_enable(data->clk); + + ver = __raw_readl(data->sfrbase + REG_MMU_VERSION); + + /* controllers on some SoCs don't report proper version */ + if (ver == 0x80000001u) + data->version = MAKE_MMU_VER(1, 0); + else + data->version = MMU_RAW_VER(ver); + + dev_dbg(data->sysmmu, "hardware version: %d.%d\n", + MMU_MAJ_VER(data->version), MMU_MIN_VER(data->version)); + + clk_disable(data->clk); + clk_disable(data->clk_master); +} + static void show_fault_information(struct sysmmu_drvdata *data, const struct sysmmu_fault_info *finfo, sysmmu_iova_t fault_addr) @@ -385,7 +407,6 @@ static void __sysmmu_init_config(struct sysmmu_drvdata *data) { unsigned int cfg; - data->version = MMU_RAW_VER(__raw_readl(data->sfrbase + REG_MMU_VERSION)); if (data->version <= MAKE_MMU_VER(3, 1)) cfg = CFG_LRU | CFG_QOS(15); else if (data->version <= MAKE_MMU_VER(3, 2)) @@ -551,6 +572,7 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev) platform_set_drvdata(pdev, data); + __sysmmu_get_version(data); pm_runtime_enable(dev); return 0; |