linux-kernel - [PATCH 5/5] coresight-tnoc: add nodes to configure freq packet

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Message-ID: <20250220-trace-noc-driver-v1-5-15d78bd48e12@quicinc.com>
Date: Thu, 20 Feb 2025 17:41:25 +0800
From: Yuanfang Zhang <quic_yuanfang@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
	<mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>,
        "Alexander
 Shishkin" <alexander.shishkin@...ux.intel.com>
CC: <kernel@...cinc.com>, <linux-kernel@...r.kernel.org>,
        <coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>
Subject: [PATCH 5/5] coresight-tnoc: add nodes to configure freq packet

Three nodes for freq packet config are added here:

1. freq_type: used to set the type of issued ATB FREQ packets.
0: 'FREQ' packets; 1: 'FREQ_TS' packets.

2. freq_req_val: used to set frequency values carried by 'FREQ'
and 'FREQ_TS' packets.

3. freq_ts_req: writing '1' to issue a 'FREQ' or 'FREQ_TS' packet.

Signed-off-by: Yuanfang Zhang <quic_yuanfang@...cinc.com>
---
 drivers/hwtracing/coresight/coresight-tnoc.c | 97 ++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtracing/coresight/coresight-tnoc.c
index 3ff3504603f66bd595484374f1cdac90c528b665..629df98959d1bfb55771376fac2818a48cb9c259 100644
--- a/drivers/hwtracing/coresight/coresight-tnoc.c
+++ b/drivers/hwtracing/coresight/coresight-tnoc.c
@@ -112,10 +112,107 @@ static ssize_t flag_type_show(struct device *dev,
 }
 static DEVICE_ATTR_RW(flag_type);
 
+static ssize_t freq_type_show(struct device *dev,
+			      struct device_attribute *attr,
+			      char *buf)
+{
+	struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	return sysfs_emit(buf, "%u\n", drvdata->freq_type);
+}
+
+static ssize_t freq_type_store(struct device *dev,
+			       struct device_attribute *attr,
+			       const char *buf,
+			       size_t size)
+{
+	struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+	unsigned long val;
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	if (val != 1 && val != 0)
+		return -EINVAL;
+
+	spin_lock(&drvdata->spinlock);
+	if (val)
+		drvdata->freq_type = FREQ_TS;
+	else
+		drvdata->freq_type = FREQ;
+	spin_unlock(&drvdata->spinlock);
+
+	return size;
+}
+static DEVICE_ATTR_RW(freq_type);
+
+static ssize_t freq_req_val_show(struct device *dev,
+				 struct device_attribute *attr,
+				char *buf)
+{
+	struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	return sysfs_emit(buf, "%u\n", drvdata->freq_req_val);
+}
+
+static ssize_t freq_req_val_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf,
+				  size_t size)
+{
+	struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+	unsigned long val;
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	if (val) {
+		spin_lock(&drvdata->spinlock);
+		drvdata->freq_req_val = val;
+		spin_unlock(&drvdata->spinlock);
+	}
+
+	return size;
+}
+static DEVICE_ATTR_RW(freq_req_val);
+
+static ssize_t freq_ts_req_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf,
+				 size_t size)
+{
+	struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+	struct coresight_device	*csdev = drvdata->csdev;
+	unsigned long val;
+	u32 reg;
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	spin_lock(&drvdata->spinlock);
+	if (csdev->refcnt == 0) {
+		spin_unlock(&drvdata->spinlock);
+		return -EPERM;
+	}
+
+	if (val) {
+		reg = readl_relaxed(drvdata->base + TRACE_NOC_CTRL);
+		reg = reg | TRACE_NOC_CTRL_FREQTSREQ;
+		writel_relaxed(reg, drvdata->base + TRACE_NOC_CTRL);
+	}
+	spin_unlock(&drvdata->spinlock);
+
+	return size;
+}
+static DEVICE_ATTR_WO(freq_ts_req);
+
 static struct attribute *trace_noc_attrs[] = {
 	&dev_attr_flush_req.attr,
 	&dev_attr_flush_status.attr,
 	&dev_attr_flag_type.attr,
+	&dev_attr_freq_type.attr,
+	&dev_attr_freq_req_val.attr,
+	&dev_attr_freq_ts_req.attr,
 	NULL,
 };
 

-- 
2.34.1