From: Janghyuck Kim <janghyuck.kim@samsung.com>
Date: Tue, 17 Oct 2017 10:21:41 +0000 (+0900)
Subject: [COMMON] iommu/exynos: add sysmmu control interface explicitly
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a78600fc902b044b755d1cc019ab691e778b325e;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[COMMON] iommu/exynos: add sysmmu control interface explicitly

Change-Id: I0d93fcbbdec3a272bb965306a7ad91a37ade3960
Signed-off-by: Janghyuck Kim <janghyuck.kim@samsung.com>
---

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index f76b1d1aefe0..13acf336240f 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -466,6 +466,9 @@ static int __init sysmmu_parse_dt(struct device *sysmmu,
 	if (of_property_read_bool(sysmmu->of_node, "sysmmu,hold-rpm-on-boot"))
 		drvdata->hold_rpm_on_boot = true;
 
+	if (of_property_read_bool(sysmmu->of_node, "sysmmu,no-rpm-control"))
+		drvdata->no_rpm_control = true;
+
 	if (IS_TLB_WAY_TYPE(drvdata)) {
 		ret = sysmmu_parse_tlb_way_dt(sysmmu, drvdata);
 		if (ret)
@@ -685,6 +688,28 @@ static int sysmmu_enable_from_master(struct device *master,
 	return ret;
 }
 
+void exynos_sysmmu_control(struct device *master, bool enable)
+{
+	unsigned long flags;
+	struct exynos_iommu_owner *owner = master->archdata.iommu;
+	struct sysmmu_list_data *list;
+	struct sysmmu_drvdata *drvdata;
+
+	BUG_ON(!has_sysmmu(master));
+
+	spin_lock_irqsave(&owner->lock, flags);
+	list_for_each_entry(list, &owner->sysmmu_list, node) {
+		drvdata = dev_get_drvdata(list->sysmmu);
+		if (!drvdata->no_rpm_control)
+			continue;
+		if (enable)
+			__sysmmu_enable_nocount(drvdata);
+		else
+			__sysmmu_disable_nocount(drvdata);
+	}
+	spin_unlock_irqrestore(&owner->lock, flags);
+}
+
 #ifdef CONFIG_PM_SLEEP
 static int exynos_sysmmu_suspend(struct device *dev)
 {
@@ -708,7 +733,7 @@ static int exynos_sysmmu_resume(struct device *dev)
 	struct sysmmu_drvdata *drvdata = dev_get_drvdata(dev);
 
 	spin_lock_irqsave(&drvdata->lock, flags);
-	if (drvdata->is_suspended) {
+	if (drvdata->is_suspended && !drvdata->no_rpm_control) {
 		__sysmmu_enable_nocount(drvdata);
 		drvdata->is_suspended = false;
 	}
diff --git a/drivers/iommu/exynos-iommu.h b/drivers/iommu/exynos-iommu.h
index e0c3e2b510a7..998aa3411d31 100644
--- a/drivers/iommu/exynos-iommu.h
+++ b/drivers/iommu/exynos-iommu.h
@@ -348,6 +348,7 @@ struct sysmmu_drvdata {
 	bool is_suspended;
 	bool hold_rpm_on_boot;
 	struct exynos_iommu_event_log log;
+	bool no_rpm_control;
 };
 
 struct exynos_vm_region {
@@ -387,18 +388,18 @@ int exynos_iommu_add_fault_handler(struct device *dev,
 
 static inline bool get_sysmmu_runtime_active(struct sysmmu_drvdata *data)
 {
-	return ++data->runtime_active == 1;
+	return ++data->runtime_active == 1 && !data->no_rpm_control;
 }
 
 static inline bool put_sysmmu_runtime_active(struct sysmmu_drvdata *data)
 {
 	BUG_ON(data->runtime_active < 1);
-	return --data->runtime_active == 0;
+	return --data->runtime_active == 0 && !data->no_rpm_control;
 }
 
 static inline bool is_sysmmu_runtime_active(struct sysmmu_drvdata *data)
 {
-	return data->runtime_active > 0;
+	return data->runtime_active > 0 && !data->no_rpm_control;
 }
 
 static inline bool set_sysmmu_active(struct sysmmu_drvdata *data)
diff --git a/include/linux/exynos_iovmm.h b/include/linux/exynos_iovmm.h
index 6c69c939c8d7..185e5e797163 100644
--- a/include/linux/exynos_iovmm.h
+++ b/include/linux/exynos_iovmm.h
@@ -268,6 +268,7 @@ int sysmmu_set_prefetch_buffer_property(struct device *dev,
 			unsigned int ipoption[], unsigned int opoption[]);
 void exynos_sysmmu_show_status(struct device *dev);
 void exynos_sysmmu_dump_pgtable(struct device *dev);
+void exynos_sysmmu_control(struct device *master, bool enable);
 
 /*
  * exynos_sysmmu_set/clear/show_ppc_event() -