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path: root/drivers/hwtracing/coresight/coresight-etb10.c
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Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etb10.c')
-rw-r--r--drivers/hwtracing/coresight/coresight-etb10.c79
1 files changed, 51 insertions, 28 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 40049869aecd..77d0f9c1118d 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -22,10 +22,11 @@
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
-#include <linux/clk.h>
+#include <linux/pm_runtime.h>
#include <linux/seq_file.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>
+#include <linux/clk.h>
#include "coresight-priv.h"
@@ -66,9 +67,9 @@
* struct etb_drvdata - specifics associated to an ETB component
* @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 ETB.
* @csdev: component vitals needed by the framework.
* @miscdev: specifics to handle "/dev/xyz.etb" entry.
- * @clk: the clock this component is associated to.
* @spinlock: only one at a time pls.
* @in_use: synchronise user space access to etb buffer.
* @buf: area of memory where ETB buffer content gets sent.
@@ -79,9 +80,9 @@
struct etb_drvdata {
void __iomem *base;
struct device *dev;
+ struct clk *atclk;
struct coresight_device *csdev;
struct miscdevice miscdev;
- struct clk *clk;
spinlock_t spinlock;
atomic_t in_use;
u8 *buf;
@@ -92,17 +93,14 @@ struct etb_drvdata {
static unsigned int etb_get_buffer_depth(struct etb_drvdata *drvdata)
{
- int ret;
u32 depth = 0;
- ret = clk_prepare_enable(drvdata->clk);
- if (ret)
- return ret;
+ pm_runtime_get_sync(drvdata->dev);
/* RO registers don't need locking */
depth = readl_relaxed(drvdata->base + ETB_RAM_DEPTH_REG);
- clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put(drvdata->dev);
return depth;
}
@@ -137,12 +135,9 @@ static void etb_enable_hw(struct etb_drvdata *drvdata)
static int etb_enable(struct coresight_device *csdev)
{
struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
- int ret;
unsigned long flags;
- ret = clk_prepare_enable(drvdata->clk);
- if (ret)
- return ret;
+ pm_runtime_get_sync(drvdata->dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
etb_enable_hw(drvdata);
@@ -252,7 +247,7 @@ static void etb_disable(struct coresight_device *csdev)
drvdata->enable = false;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
- clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put(drvdata->dev);
dev_info(drvdata->dev, "ETB disabled\n");
}
@@ -339,16 +334,12 @@ static const struct file_operations etb_fops = {
static ssize_t status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int ret;
unsigned long flags;
u32 etb_rdr, etb_sr, etb_rrp, etb_rwp;
u32 etb_trg, etb_cr, etb_ffsr, etb_ffcr;
struct etb_drvdata *drvdata = dev_get_drvdata(dev->parent);
- ret = clk_prepare_enable(drvdata->clk);
- if (ret)
- goto out;
-
+ pm_runtime_get_sync(drvdata->dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
CS_UNLOCK(drvdata->base);
@@ -364,7 +355,7 @@ static ssize_t status_show(struct device *dev,
CS_LOCK(drvdata->base);
spin_unlock_irqrestore(&drvdata->spinlock, flags);
- clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put(drvdata->dev);
return sprintf(buf,
"Depth:\t\t0x%x\n"
@@ -377,7 +368,7 @@ static ssize_t status_show(struct device *dev,
"Flush ctrl:\t0x%x\n",
etb_rdr, etb_sr, etb_rrp, etb_rwp,
etb_trg, etb_cr, etb_ffsr, etb_ffcr);
-out:
+
return -EINVAL;
}
static DEVICE_ATTR_RO(status);
@@ -438,6 +429,12 @@ static int etb_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 */
@@ -449,21 +446,19 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
spin_lock_init(&drvdata->spinlock);
- drvdata->clk = adev->pclk;
- ret = clk_prepare_enable(drvdata->clk);
- if (ret)
- return ret;
-
drvdata->buffer_depth = etb_get_buffer_depth(drvdata);
- clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put(&adev->dev);
- if (drvdata->buffer_depth < 0)
+ if (drvdata->buffer_depth & 0x80000000)
return -EINVAL;
drvdata->buf = devm_kzalloc(dev,
drvdata->buffer_depth * 4, GFP_KERNEL);
- if (!drvdata->buf)
+ if (!drvdata->buf) {
+ dev_err(dev, "Failed to allocate %u bytes for buffer data\n",
+ drvdata->buffer_depth * 4);
return -ENOMEM;
+ }
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
@@ -503,6 +498,32 @@ static int etb_remove(struct amba_device *adev)
return 0;
}
+#ifdef CONFIG_PM
+static int etb_runtime_suspend(struct device *dev)
+{
+ struct etb_drvdata *drvdata = dev_get_drvdata(dev);
+
+ if (drvdata && !IS_ERR(drvdata->atclk))
+ clk_disable_unprepare(drvdata->atclk);
+
+ return 0;
+}
+
+static int etb_runtime_resume(struct device *dev)
+{
+ struct etb_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 etb_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(etb_runtime_suspend, etb_runtime_resume, NULL)
+};
+
static struct amba_id etb_ids[] = {
{
.id = 0x0003b907,
@@ -515,6 +536,8 @@ static struct amba_driver etb_driver = {
.drv = {
.name = "coresight-etb10",
.owner = THIS_MODULE,
+ .pm = &etb_dev_pm_ops,
+
},
.probe = etb_probe,
.remove = etb_remove,