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path: root/drivers/hwtracing/coresight/coresight-tpiu.c
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Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tpiu.c')
-rw-r--r--drivers/hwtracing/coresight/coresight-tpiu.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index 688ba937069e..7214efd10db5 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -20,6 +20,7 @@
#include <linux/pm_runtime.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>
+#include <linux/clk.h>
#include "coresight-priv.h"
@@ -50,11 +51,13 @@
/**
* @base: memory mapped base address for this component.
* @dev: the device entity associated to this component.
+ * @atclk: optional clock for the core parts of the TPIU.
* @csdev: component vitals needed by the framework.
*/
struct tpiu_drvdata {
void __iomem *base;
struct device *dev;
+ struct clk *atclk;
struct coresight_device *csdev;
};
@@ -111,6 +114,7 @@ static const struct coresight_ops tpiu_cs_ops = {
static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
{
+ int ret;
void __iomem *base;
struct device *dev = &adev->dev;
struct coresight_platform_data *pdata = NULL;
@@ -131,6 +135,12 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
return -ENOMEM;
drvdata->dev = &adev->dev;
+ drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
+ if (!IS_ERR(drvdata->atclk)) {
+ ret = clk_prepare_enable(drvdata->atclk);
+ if (ret)
+ return ret;
+ }
dev_set_drvdata(dev, drvdata);
/* Validity for the resource is already checked by the AMBA core */
@@ -170,6 +180,32 @@ static int tpiu_remove(struct amba_device *adev)
return 0;
}
+#ifdef CONFIG_PM
+static int tpiu_runtime_suspend(struct device *dev)
+{
+ struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
+
+ if (drvdata && !IS_ERR(drvdata->atclk))
+ clk_disable_unprepare(drvdata->atclk);
+
+ return 0;
+}
+
+static int tpiu_runtime_resume(struct device *dev)
+{
+ struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
+
+ if (drvdata && !IS_ERR(drvdata->atclk))
+ clk_prepare_enable(drvdata->atclk);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops tpiu_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
+};
+
static struct amba_id tpiu_ids[] = {
{
.id = 0x0003b912,
@@ -186,6 +222,7 @@ static struct amba_driver tpiu_driver = {
.drv = {
.name = "coresight-tpiu",
.owner = THIS_MODULE,
+ .pm = &tpiu_dev_pm_ops,
},
.probe = tpiu_probe,
.remove = tpiu_remove,