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Date: Mon, 12 Jun 2023 15:07:41 +0800
From: Tao Zhang <quic_taozha@...cinc.com>
To: Mathieu Poirier <mathieu.poirier@...aro.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Konrad Dybcio <konradybcio@...il.com>,
Mike Leach <mike.leach@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC: Tao Zhang <quic_taozha@...cinc.com>,
Jinlong Mao <quic_jinlmao@...cinc.com>,
Leo Yan <leo.yan@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
<coresight@...ts.linaro.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
Tingwei Zhang <quic_tingweiz@...cinc.com>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>,
Hao Zhang <quic_hazha@...cinc.com>,
<linux-arm-msm@...r.kernel.org>, <andersson@...nel.org>
Subject: [PATCH v5 08/13] coresight-tpdm: Add node to set dsb programming mode
Add node to set and show programming mode for TPDM DSB subunit.
Once the DSB programming mode is set, it will be written to the
register DSB_CR.
Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
---
.../ABI/testing/sysfs-bus-coresight-devices-tpdm | 15 ++++++
drivers/hwtracing/coresight/coresight-tpdm.c | 62 ++++++++++++++++++++++
drivers/hwtracing/coresight/coresight-tpdm.h | 16 ++++++
3 files changed, 93 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
index 0b7b4ad..2a82cd0 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
@@ -45,3 +45,18 @@ Description:
Accepts only one of the 2 values - 0 or 1.
0 : Set the DSB trigger type to false
1 : Set the DSB trigger type to true
+
+What: /sys/bus/coresight/devices/<tpdm-name>/dsb_mode
+Date: March 2023
+KernelVersion 6.5
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
+Description:
+ (Write) Set the mode of DSB tpdm. Read the mode of DSB
+ tpdm.
+
+ Accepts the value needs to be greater than 0. What data
+ bits do is listed below.
+ Bit[0:1] : Test mode control bit for choosing the inputs.
+ Bit[3] : Set to 0 for low performance mode.
+ Set to 1 for high performance mode.
+ Bit[4:8] : Select byte lane for high performance mode.
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
index 62efc18..c38760b 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -4,6 +4,7 @@
*/
#include <linux/amba/bus.h>
+#include <linux/bitfield.h>
#include <linux/bitmap.h>
#include <linux/coresight.h>
#include <linux/coresight-pmu.h>
@@ -42,6 +43,32 @@ static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
}
}
+static void set_dsb_test_mode(struct tpdm_drvdata *drvdata, u32 *val)
+{
+ u32 mode;
+
+ mode = TPDM_DSB_MODE_TEST(drvdata->dsb->mode);
+ *val &= ~TPDM_DSB_TEST_MODE;
+ *val |= FIELD_PREP(TPDM_DSB_TEST_MODE, mode);
+}
+
+static void set_dsb_hpsel_mode(struct tpdm_drvdata *drvdata, u32 *val)
+{
+ u32 mode;
+
+ mode = TPDM_DSB_MODE_HPBYTESEL(drvdata->dsb->mode);
+ *val &= ~TPDM_DSB_HPSEL;
+ *val |= FIELD_PREP(TPDM_DSB_HPSEL, mode);
+}
+
+static void set_dsb_perf_mode(struct tpdm_drvdata *drvdata, u32 *val)
+{
+ if (drvdata->dsb->mode & TPDM_DSB_MODE_PERF)
+ *val |= TPDM_DSB_CR_MODE;
+ else
+ *val &= ~TPDM_DSB_CR_MODE;
+}
+
static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
{
u32 val;
@@ -55,6 +82,12 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
+ /* Set the test accurate mode */
+ set_dsb_test_mode(drvdata, &val);
+ /* Set the byte lane for high-performance mode */
+ set_dsb_hpsel_mode(drvdata, &val);
+ /* Set the performance mode */
+ set_dsb_perf_mode(drvdata, &val);
/* Set trigger type */
if (drvdata->dsb->trig_type)
val |= TPDM_DSB_CR_TRIG_TYPE;
@@ -241,6 +274,34 @@ static struct attribute_group tpdm_attr_grp = {
.attrs = tpdm_attrs,
};
+static ssize_t dsb_mode_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ return sysfs_emit(buf, "%lx\n",
+ (unsigned long)drvdata->dsb->mode);
+}
+
+static ssize_t dsb_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t size)
+{
+ struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ unsigned long val;
+
+ if ((kstrtoul(buf, 0, &val)) || val < 0)
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ drvdata->dsb->mode = val & TPDM_DSB_MODE_MASK;
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(dsb_mode);
+
static ssize_t dsb_trig_type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -312,6 +373,7 @@ static ssize_t dsb_trig_ts_store(struct device *dev,
static DEVICE_ATTR_RW(dsb_trig_ts);
static struct attribute *tpdm_dsb_attrs[] = {
+ &dev_attr_dsb_mode.attr,
&dev_attr_dsb_trig_ts.attr,
&dev_attr_dsb_trig_type.attr,
NULL,
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
index 92c34cd..49fffb1 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.h
+++ b/drivers/hwtracing/coresight/coresight-tpdm.h
@@ -15,11 +15,25 @@
/* Enable bit for DSB subunit */
#define TPDM_DSB_CR_ENA BIT(0)
+/* Enable bit for DSB subunit perfmance mode */
+#define TPDM_DSB_CR_MODE BIT(1)
/* Enable bit for DSB subunit trigger type */
#define TPDM_DSB_CR_TRIG_TYPE BIT(12)
+
/* Enable bit for DSB subunit trigger timestamp */
#define TPDM_DSB_TIER_XTRIG_TSENAB BIT(1)
+/* DSB programming modes */
+/* Test mode control bit*/
+#define TPDM_DSB_MODE_TEST(val) (val & GENMASK(1, 0))
+/* Performance mode */
+#define TPDM_DSB_MODE_PERF BIT(3)
+/* High performance mode */
+#define TPDM_DSB_MODE_HPBYTESEL(val) (val & GENMASK(8, 4))
+#define TPDM_DSB_MODE_MASK GENMASK(8, 0)
+#define TPDM_DSB_TEST_MODE GENMASK(10, 9)
+#define TPDM_DSB_HPSEL GENMASK(6, 2)
+
/* TPDM integration test registers */
#define TPDM_ITATBCNTRL (0xEF0)
#define TPDM_ITCNTRL (0xF00)
@@ -48,10 +62,12 @@
/**
* struct dsb_dataset - specifics associated to dsb dataset
+ * @mode: DSB programming mode
* @trig_ts: Enable/Disable trigger timestamp.
* @trig_type: Enable/Disable trigger type.
*/
struct dsb_dataset {
+ u32 mode;
bool trig_ts;
bool trig_type;
};
--
2.7.4
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