iommu: exynos: add system suspend/resume support

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index a361cc8..0c4e8fc 100644 (file)
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -600,6 +600,32 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int exynos_sysmmu_suspend(struct device *dev)
+{
+       struct sysmmu_drvdata *data = dev_get_drvdata(dev);
+
+       dev_dbg(dev, "suspend\n");
+       if (is_sysmmu_active(data))
+               __sysmmu_disable_nocount(data);
+       return 0;
+}
+
+static int exynos_sysmmu_resume(struct device *dev)
+{
+       struct sysmmu_drvdata *data = dev_get_drvdata(dev);
+
+       dev_dbg(dev, "resume\n");
+       if (is_sysmmu_active(data))
+               __sysmmu_enable_nocount(data);
+       return 0;
+}
+#endif
+
+static const struct dev_pm_ops sysmmu_pm_ops = {
+       SET_LATE_SYSTEM_SLEEP_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume)
+};
+
 static const struct of_device_id sysmmu_of_match[] __initconst = {
        { .compatible   = "samsung,exynos-sysmmu", },
        { },
@@ -610,6 +636,7 @@ static struct platform_driver exynos_sysmmu_driver __refdata = {
        .driver = {
                .name           = "exynos-sysmmu",
                .of_match_table = sysmmu_of_match,
+               .pm             = &sysmmu_pm_ops,
        }
 };