iommu/exynos: Add support for SYSMMU controller with bogus version reg
SYSMMU on some SoCs reports bogus values in VERSION register. Force
hardware version to 1.0 for such controllers. This patch also moves reading
version register to driver's probe() function.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index e42a76c..8e289e2 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -284,6 +284,28 @@
__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 @@
{
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 @@
platform_set_drvdata(pdev, data);
+ __sysmmu_get_version(data);
pm_runtime_enable(dev);
return 0;